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"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file;
66 int pending_invalid_xref_line;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
74 static tree enum_next_value;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file;
102 static int current_function_prototype_line;
104 /* The current statement tree. */
106 static GTY(()) struct stmt_tree_s c_stmt_tree;
108 /* The current scope statement stack. */
110 static GTY(()) tree c_scope_stmt_stack;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static GTY(()) tree named_labels;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static GTY(()) tree shadowed_labels;
122 /* Set to 0 at beginning of a function definition, set to 1 if
123 a return statement that specifies a return value is seen. */
125 int current_function_returns_value;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement with no argument is seen. */
130 int current_function_returns_null;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a call to a noreturn function is seen. */
135 int current_function_returns_abnormally;
137 /* Set to nonzero by `grokdeclarator' for a function
138 whose return type is defaulted, if warnings for this are desired. */
140 static int warn_about_return_type;
142 /* Nonzero when starting a function declared `extern inline'. */
144 static int current_extern_inline;
146 /* For each binding contour we allocate a binding_level structure
147 * which records the names defined in that contour.
150 * 1) one for each function definition,
151 * where internal declarations of the parameters appear.
152 * 2) one for each compound statement,
153 * to record its declarations.
155 * The current meaning of a name can be found by searching the levels from
156 * the current one out to the global one.
159 /* Note that the information in the `names' component of the global contour
160 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
162 struct binding_level GTY(())
164 /* A chain of _DECL nodes for all variables, constants, functions,
165 and typedef types. These are in the reverse of the order supplied.
169 /* A list of structure, union and enum definitions,
170 * for looking up tag names.
171 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
172 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
173 * or ENUMERAL_TYPE node.
177 /* For each level, a list of shadowed outer-level local definitions
178 to be restored when this level is popped.
179 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
180 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
183 /* For each level (except not the global one),
184 a chain of BLOCK nodes for all the levels
185 that were entered and exited one level down. */
188 /* The BLOCK node for this level, if one has been preallocated.
189 If 0, the BLOCK is allocated (if needed) when the level is popped. */
192 /* The binding level which this one is contained in (inherits from). */
193 struct binding_level *level_chain;
195 /* Nonzero for the level that holds the parameters of a function. */
198 /* Nonzero if this level "doesn't exist" for tags. */
199 char tag_transparent;
201 /* Nonzero if sublevels of this level "don't exist" for tags.
202 This is set in the parm level of a function definition
203 while reading the function body, so that the outermost block
204 of the function body will be tag-transparent. */
205 char subblocks_tag_transparent;
207 /* Nonzero means make a BLOCK for this level regardless of all else. */
210 /* Nonzero means make a BLOCK if this level has any subblocks. */
211 char keep_if_subblocks;
213 /* List of decls in `names' that have incomplete structure or
215 tree incomplete_list;
217 /* A list of decls giving the (reversed) specified order of parms,
218 not including any forward-decls in the parmlist.
219 This is so we can put the parms in proper order for assign_parms. */
223 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
225 /* The binding level currently in effect. */
227 static GTY(()) struct binding_level *current_binding_level;
229 /* A chain of binding_level structures awaiting reuse. */
231 static GTY((deletable (""))) struct binding_level *free_binding_level;
233 /* The outermost binding level, for names of file scope.
234 This is created when the compiler is started and exists
235 through the entire run. */
237 static GTY(()) struct binding_level *global_binding_level;
239 /* Binding level structures are initialized by copying this one. */
241 static struct binding_level clear_binding_level
242 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, NULL,
245 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
247 static int keep_next_level_flag;
249 /* Nonzero means make a BLOCK for the next level pushed
250 if it has subblocks. */
252 static int keep_next_if_subblocks;
254 /* The chain of outer levels of label scopes.
255 This uses the same data structure used for binding levels,
256 but it works differently: each link in the chain records
257 saved values of named_labels and shadowed_labels for
258 a label binding level outside the current one. */
260 static GTY(()) struct binding_level *label_level_chain;
262 /* Functions called automatically at the beginning and end of execution. */
264 tree static_ctors, static_dtors;
266 /* Forward declarations. */
268 static struct binding_level * make_binding_level PARAMS ((void));
269 static void pop_binding_level PARAMS ((struct binding_level **));
270 static void clear_limbo_values PARAMS ((tree));
271 static int duplicate_decls PARAMS ((tree, tree, int));
272 static int redeclaration_error_message PARAMS ((tree, tree));
273 static void storedecls PARAMS ((tree));
274 static void storetags PARAMS ((tree));
275 static tree lookup_tag PARAMS ((enum tree_code, tree,
276 struct binding_level *, int));
277 static tree lookup_tag_reverse PARAMS ((tree));
278 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
280 static tree grokparms PARAMS ((tree, int));
281 static void layout_array_type PARAMS ((tree));
282 static tree c_make_fname_decl PARAMS ((tree, int));
283 static void c_expand_body PARAMS ((tree, int, int));
284 static void warn_if_shadowing PARAMS ((tree, tree));
286 /* C-specific option variables. */
288 /* Nonzero means allow type mismatches in conditional expressions;
289 just make their values `void'. */
291 int flag_cond_mismatch;
293 /* Nonzero means don't recognize the keyword `asm'. */
297 /* Nonzero means enable C89 Amendment 1 features. */
301 /* Nonzero means use the ISO C99 dialect of C. */
305 /* Nonzero means that we have builtin functions, and main is an int */
309 /* Nonzero means add default format_arg attributes for functions not
312 int flag_noniso_default_format_attributes = 1;
314 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
316 int flag_signed_bitfields = 1;
317 int explicit_flag_signed_bitfields = 0;
319 /* Nonzero means warn about use of implicit int. */
321 int warn_implicit_int;
323 /* Nonzero means warn about usage of long long when `-pedantic'. */
325 int warn_long_long = 1;
327 /* Nonzero means message about use of implicit function declarations;
328 1 means warning; 2 means error. */
330 int mesg_implicit_function_declaration = -1;
332 /* Nonzero means give string constants the type `const char *'
333 to get extra warnings from them. These warnings will be too numerous
334 to be useful, except in thoroughly ANSIfied programs. */
336 int flag_const_strings;
338 /* Nonzero means warn about pointer casts that can drop a type qualifier
339 from the pointer target type. */
343 /* Nonzero means warn when casting a function call to a type that does
344 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
345 when there is no previous declaration of sqrt or malloc. */
347 int warn_bad_function_cast;
349 /* Warn about functions which might be candidates for format attributes. */
351 int warn_missing_format_attribute;
353 /* Warn about traditional constructs whose meanings changed in ANSI C. */
355 int warn_traditional;
357 /* Nonzero means warn about sizeof(function) or addition/subtraction
358 of function pointers. */
360 int warn_pointer_arith;
362 /* Nonzero means warn for non-prototype function decls
363 or non-prototyped defs without previous prototype. */
365 int warn_strict_prototypes;
367 /* Nonzero means warn for any global function def
368 without separate previous prototype decl. */
370 int warn_missing_prototypes;
372 /* Nonzero means warn for any global function def
373 without separate previous decl. */
375 int warn_missing_declarations;
377 /* Nonzero means warn about multiple (redundant) decls for the same single
378 variable or function. */
380 int warn_redundant_decls = 0;
382 /* Nonzero means warn about extern declarations of objects not at
383 file-scope level and about *all* declarations of functions (whether
384 extern or static) not at file-scope level. Note that we exclude
385 implicit function declarations. To get warnings about those, use
388 int warn_nested_externs = 0;
390 /* Warn about a subscript that has type char. */
392 int warn_char_subscripts = 0;
394 /* Warn if a type conversion is done that might have confusing results. */
398 /* Warn if adding () is suggested. */
400 int warn_parentheses;
402 /* Warn if initializer is not completely bracketed. */
404 int warn_missing_braces;
406 /* Warn if main is suspicious. */
410 /* Warn about #pragma directives that are not recognised. */
412 int warn_unknown_pragmas = 0; /* Tri state variable. */
414 /* Warn about comparison of signed and unsigned values.
415 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
417 int warn_sign_compare = -1;
419 /* Warn about testing equality of floating point numbers. */
421 int warn_float_equal = 0;
423 /* Nonzero means `$' can be in an identifier. */
425 #ifndef DOLLARS_IN_IDENTIFIERS
426 #define DOLLARS_IN_IDENTIFIERS 1
428 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
430 /* States indicating how grokdeclarator() should handle declspecs marked
431 with __attribute__((deprecated)). An object declared as
432 __attribute__((deprecated)) suppresses warnings of uses of other
435 enum deprecated_states {
440 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
442 /* Decode the string P as a language-specific option for C.
443 Return the number of strings consumed. Should not complain
444 if it does not recognise the option. */
447 c_decode_option (argc, argv)
448 int argc ATTRIBUTE_UNUSED;
451 int strings_processed;
454 static const struct {
455 /* The name of the option. */
457 /* A pointer to a flag variable to set to 0 or 1. */
460 /* This list is in alphabetical order. Keep it like that. */
461 { "bad-function-cast", &warn_bad_function_cast },
462 { "cast-qual", &warn_cast_qual },
463 { "char-subscripts", &warn_char_subscripts },
464 { "conversion", &warn_conversion },
465 { "div-by-zero", &warn_div_by_zero },
466 { "float-equal", &warn_float_equal },
467 { "format-extra-args", &warn_format_extra_args },
468 { "format-zero-length", &warn_format_zero_length },
469 { "format-nonliteral", &warn_format_nonliteral },
470 { "format-security", &warn_format_security },
471 { "format-y2k", &warn_format_y2k },
472 { "implicit-function-declaration", &mesg_implicit_function_declaration },
473 { "implicit-int", &warn_implicit_int },
474 { "long-long", &warn_long_long },
475 { "main", &warn_main },
476 { "missing-braces", &warn_missing_braces },
477 { "missing-declarations", &warn_missing_declarations },
478 { "missing-format-attribute", &warn_missing_format_attribute },
479 { "missing-prototypes", &warn_missing_prototypes },
480 { "multichar", &warn_multichar },
481 { "nested-externs", &warn_nested_externs },
482 { "nonnull", &warn_nonnull },
483 { "parentheses", &warn_parentheses },
484 { "pointer-arith", &warn_pointer_arith },
485 { "redundant-decls", &warn_redundant_decls },
486 { "return-type", &warn_return_type },
487 { "sequence-point", &warn_sequence_point },
488 { "sign-compare", &warn_sign_compare },
489 { "strict-prototypes", &warn_strict_prototypes },
490 { "traditional", &warn_traditional },
491 { "write-strings", &flag_const_strings }
494 strings_processed = cpp_handle_option (parse_in, argc, argv);
496 if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
501 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
505 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
509 else if (!strncmp (p, "-std=", 5))
511 /* Select the appropriate language standard. We currently
513 -std=iso9899:1990 same as -ansi
514 -std=iso9899:199409 ISO C as modified in amend. 1
515 -std=iso9899:1999 ISO C 99
516 -std=c89 same as -std=iso9899:1990
517 -std=c99 same as -std=iso9899:1999
518 -std=gnu89 default, iso9899:1990 + gnu extensions
519 -std=gnu99 iso9899:1999 + gnu extensions
521 const char *const argstart = &p[5];
523 if (!strcmp (argstart, "iso9899:1990")
524 || !strcmp (argstart, "c89"))
529 flag_writable_strings = 0;
531 flag_no_nonansi_builtin = 1;
532 flag_noniso_default_format_attributes = 0;
536 else if (!strcmp (argstart, "iso9899:199409"))
541 else if (!strcmp (argstart, "iso9899:199x")
542 || !strcmp (argstart, "iso9899:1999")
543 || !strcmp (argstart, "c9x")
544 || !strcmp (argstart, "c99"))
546 flag_writable_strings = 0;
548 flag_no_nonansi_builtin = 1;
549 flag_noniso_default_format_attributes = 0;
554 else if (!strcmp (argstart, "gnu89"))
556 flag_writable_strings = 0;
558 flag_no_nonansi_builtin = 0;
559 flag_noniso_default_format_attributes = 1;
563 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
565 flag_writable_strings = 0;
567 flag_no_nonansi_builtin = 0;
568 flag_noniso_default_format_attributes = 1;
572 else if (!strcmp (argstart, "c++98"))
573 ; /* Handled by cpplib. */
575 error ("unknown C standard `%s'", argstart);
577 else if (!strcmp (p, "-fdollars-in-identifiers"))
578 dollars_in_ident = 1;
579 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
580 dollars_in_ident = 0;
581 else if (!strcmp (p, "-fsigned-char"))
582 flag_signed_char = 1;
583 else if (!strcmp (p, "-funsigned-char"))
584 flag_signed_char = 0;
585 else if (!strcmp (p, "-fno-signed-char"))
586 flag_signed_char = 0;
587 else if (!strcmp (p, "-fno-unsigned-char"))
588 flag_signed_char = 1;
589 else if (!strcmp (p, "-fsigned-bitfields")
590 || !strcmp (p, "-fno-unsigned-bitfields"))
592 flag_signed_bitfields = 1;
593 explicit_flag_signed_bitfields = 1;
595 else if (!strcmp (p, "-funsigned-bitfields")
596 || !strcmp (p, "-fno-signed-bitfields"))
598 flag_signed_bitfields = 0;
599 explicit_flag_signed_bitfields = 1;
601 else if (!strcmp (p, "-fshort-enums"))
602 flag_short_enums = 1;
603 else if (!strcmp (p, "-fno-short-enums"))
604 flag_short_enums = 0;
605 else if (!strcmp (p, "-fshort-wchar"))
606 flag_short_wchar = 1;
607 else if (!strcmp (p, "-fno-short-wchar"))
608 flag_short_wchar = 0;
609 else if (!strcmp (p, "-fcond-mismatch"))
610 flag_cond_mismatch = 1;
611 else if (!strcmp (p, "-fno-cond-mismatch"))
612 flag_cond_mismatch = 0;
613 else if (!strcmp (p, "-fshort-double"))
614 flag_short_double = 1;
615 else if (!strcmp (p, "-fno-short-double"))
616 flag_short_double = 0;
617 else if (!strcmp (p, "-fasm"))
619 else if (!strcmp (p, "-fno-asm"))
621 else if (!strcmp (p, "-fms-extensions"))
622 flag_ms_extensions = 1;
623 else if (!strcmp (p, "-fno-ms-extensions"))
624 flag_ms_extensions = 0;
625 else if (!strcmp (p, "-fbuiltin"))
627 else if (!strcmp (p, "-fno-builtin"))
629 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
630 disable_builtin_function (p + strlen ("-fno-builtin-"));
631 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
633 else if (!strcmp (p, "-ansi"))
635 else if (!strcmp (p, "-undef"))
637 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
638 mesg_implicit_function_declaration = 2;
639 else if (!strncmp (p, "-Wformat=", 9))
640 set_Wformat (atoi (p + 9));
641 else if (!strcmp (p, "-Wformat"))
643 else if (!strcmp (p, "-Wno-format"))
645 else if (!strcmp (p, "-Wimplicit"))
647 warn_implicit_int = 1;
648 if (mesg_implicit_function_declaration != 2)
649 mesg_implicit_function_declaration = 1;
651 else if (!strcmp (p, "-Wno-implicit"))
652 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
653 else if (!strcmp (p, "-Wno-main"))
655 else if (!strcmp (p, "-Wunknown-pragmas"))
656 /* Set to greater than 1, so that even unknown pragmas in system
657 headers will be warned about. */
658 warn_unknown_pragmas = 2;
659 else if (!strcmp (p, "-Wno-unknown-pragmas"))
660 warn_unknown_pragmas = 0;
661 else if (!strcmp (p, "-Wall"))
663 /* We save the value of warn_uninitialized, since if they put
664 -Wuninitialized on the command line, we need to generate a
665 warning about not using it without also specifying -O. */
666 if (warn_uninitialized != 1)
667 warn_uninitialized = 2;
668 warn_implicit_int = 1;
669 mesg_implicit_function_declaration = 1;
670 warn_return_type = 1;
674 warn_char_subscripts = 1;
675 warn_parentheses = 1;
676 warn_sequence_point = 1;
677 warn_missing_braces = 1;
678 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
679 it off only if it's not explicit. */
681 /* Only warn about unknown pragmas that are not in system headers. */
682 warn_unknown_pragmas = 1;
684 else if (!strcmp (p, "-E"))
685 flag_preprocess_only = 1;
689 for (i = 0; i < ARRAY_SIZE (warn_options); i++)
690 if (strncmp (p, "-W", 2) == 0
691 && (strcmp (p+2, warn_options[i].option) == 0
692 || (strncmp (p+2, "no-", 3) == 0
693 && strcmp (p+5, warn_options[i].option) == 0)))
695 *(warn_options[i].flag) = strncmp (p+2, "no-", 3) != 0;
698 return strings_processed;
705 c_print_identifier (file, node, indent)
710 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
711 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
712 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
713 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
714 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
715 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
716 if (C_IS_RESERVED_WORD (node))
718 tree rid = ridpointers[C_RID_CODE (node)];
719 indent_to (file, indent + 4);
720 fprintf (file, "rid ");
721 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
722 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
726 /* Hook called at end of compilation to assume 1 elt
727 for a top-level tentative array defn that wasn't complete before. */
730 c_finish_incomplete_decl (decl)
733 if (TREE_CODE (decl) == VAR_DECL)
735 tree type = TREE_TYPE (decl);
736 if (type != error_mark_node
737 && TREE_CODE (type) == ARRAY_TYPE
738 && ! DECL_EXTERNAL (decl)
739 && TYPE_DOMAIN (type) == 0)
741 warning_with_decl (decl, "array `%s' assumed to have one element");
743 complete_array_type (type, NULL_TREE, 1);
745 layout_decl (decl, 0);
750 /* Reuse or create a struct for this binding level. */
752 static struct binding_level *
753 make_binding_level ()
755 if (free_binding_level)
757 struct binding_level *result = free_binding_level;
758 free_binding_level = result->level_chain;
762 return (struct binding_level *) ggc_alloc (sizeof (struct binding_level));
765 /* Remove a binding level from a list and add it to the level chain. */
768 pop_binding_level (lp)
769 struct binding_level **lp;
771 struct binding_level *l = *lp;
772 *lp = l->level_chain;
774 memset (l, 0, sizeof (struct binding_level));
775 l->level_chain = free_binding_level;
776 free_binding_level = l;
779 /* Nonzero if we are currently in the global binding level. */
784 return current_binding_level == global_binding_level;
790 keep_next_level_flag = 1;
793 /* Nonzero if the current level needs to have a BLOCK made. */
798 return ((current_binding_level->keep_if_subblocks
799 && current_binding_level->blocks != 0)
800 || current_binding_level->keep
801 || current_binding_level->names != 0
802 || (current_binding_level->tags != 0
803 && !current_binding_level->tag_transparent));
806 /* Identify this binding level as a level of parameters.
807 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
808 But it turns out there is no way to pass the right value for
809 DEFINITION_FLAG, so we ignore it. */
812 declare_parm_level (definition_flag)
813 int definition_flag ATTRIBUTE_UNUSED;
815 current_binding_level->parm_flag = 1;
818 /* Nonzero if currently making parm declarations. */
823 return current_binding_level->parm_flag;
826 /* Enter a new binding level.
827 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
828 not for that of tags. */
831 pushlevel (tag_transparent)
834 struct binding_level *newlevel = NULL_BINDING_LEVEL;
836 /* If this is the top level of a function,
837 just make sure that NAMED_LABELS is 0. */
839 if (current_binding_level == global_binding_level)
844 newlevel = make_binding_level ();
846 /* Add this level to the front of the chain (stack) of levels that
849 *newlevel = clear_binding_level;
850 newlevel->tag_transparent
852 || (current_binding_level
853 ? current_binding_level->subblocks_tag_transparent
855 newlevel->level_chain = current_binding_level;
856 current_binding_level = newlevel;
857 newlevel->keep = keep_next_level_flag;
858 keep_next_level_flag = 0;
859 newlevel->keep_if_subblocks = keep_next_if_subblocks;
860 keep_next_if_subblocks = 0;
863 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
866 clear_limbo_values (block)
871 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
872 if (DECL_NAME (tem) != 0)
873 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
875 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
876 clear_limbo_values (tem);
879 /* Exit a binding level.
880 Pop the level off, and restore the state of the identifier-decl mappings
881 that were in effect when this level was entered.
883 If KEEP is nonzero, this level had explicit declarations, so
884 and create a "block" (a BLOCK node) for the level
885 to record its declarations and subblocks for symbol table output.
887 If FUNCTIONBODY is nonzero, this level is the body of a function,
888 so create a block as if KEEP were set and also clear out all
891 If REVERSE is nonzero, reverse the order of decls before putting
892 them into the BLOCK. */
895 poplevel (keep, reverse, functionbody)
901 /* The chain of decls was accumulated in reverse order.
902 Put it into forward order, just for cleanliness. */
904 tree tags = current_binding_level->tags;
905 tree subblocks = current_binding_level->blocks;
908 int block_previously_created;
910 keep |= current_binding_level->keep;
912 /* This warning is turned off because it causes warnings for
913 declarations like `extern struct foo *x'. */
915 /* Warn about incomplete structure types in this level. */
916 for (link = tags; link; link = TREE_CHAIN (link))
917 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
919 tree type = TREE_VALUE (link);
920 tree type_name = TYPE_NAME (type);
921 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
923 : DECL_NAME (type_name));
924 switch (TREE_CODE (type))
927 error ("`struct %s' incomplete in scope ending here", id);
930 error ("`union %s' incomplete in scope ending here", id);
933 error ("`enum %s' incomplete in scope ending here", id);
939 /* Get the decls in the order they were written.
940 Usually current_binding_level->names is in reverse order.
941 But parameter decls were previously put in forward order. */
944 current_binding_level->names
945 = decls = nreverse (current_binding_level->names);
947 decls = current_binding_level->names;
949 /* Output any nested inline functions within this block
950 if they weren't already output. */
952 for (decl = decls; decl; decl = TREE_CHAIN (decl))
953 if (TREE_CODE (decl) == FUNCTION_DECL
954 && ! TREE_ASM_WRITTEN (decl)
955 && DECL_INITIAL (decl) != 0
956 && TREE_ADDRESSABLE (decl))
958 /* If this decl was copied from a file-scope decl
959 on account of a block-scope extern decl,
960 propagate TREE_ADDRESSABLE to the file-scope decl.
962 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
963 true, since then the decl goes through save_for_inline_copying. */
964 if (DECL_ABSTRACT_ORIGIN (decl) != 0
965 && DECL_ABSTRACT_ORIGIN (decl) != decl)
966 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
969 /* We used to warn about unused variables in expand_end_bindings,
970 i.e. while generating RTL. But in function-at-a-time mode we may
971 choose to never expand a function at all (e.g. auto inlining), so
972 we do this explicitly now. */
973 warn_about_unused_variables (getdecls ());
975 /* If there were any declarations or structure tags in that level,
976 or if this level is a function body,
977 create a BLOCK to record them for the life of this function. */
980 block_previously_created = (current_binding_level->this_block != 0);
981 if (block_previously_created)
982 block = current_binding_level->this_block;
983 else if (keep || functionbody
984 || (current_binding_level->keep_if_subblocks && subblocks != 0))
985 block = make_node (BLOCK);
988 BLOCK_VARS (block) = decls;
989 BLOCK_SUBBLOCKS (block) = subblocks;
992 /* In each subblock, record that this is its superior. */
994 for (link = subblocks; link; link = TREE_CHAIN (link))
995 BLOCK_SUPERCONTEXT (link) = block;
997 /* Clear out the meanings of the local variables of this level. */
999 for (link = decls; link; link = TREE_CHAIN (link))
1001 if (DECL_NAME (link) != 0)
1003 /* If the ident. was used or addressed via a local extern decl,
1004 don't forget that fact. */
1005 if (DECL_EXTERNAL (link))
1007 if (TREE_USED (link))
1008 TREE_USED (DECL_NAME (link)) = 1;
1009 if (TREE_ADDRESSABLE (link))
1010 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1012 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1016 /* Restore all name-meanings of the outer levels
1017 that were shadowed by this level. */
1019 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1020 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1022 /* If the level being exited is the top level of a function,
1023 check over all the labels, and clear out the current
1024 (function local) meanings of their names. */
1028 clear_limbo_values (block);
1030 /* If this is the top level block of a function,
1031 the vars are the function's parameters.
1032 Don't leave them in the BLOCK because they are
1033 found in the FUNCTION_DECL instead. */
1035 BLOCK_VARS (block) = 0;
1037 /* Clear out the definitions of all label names,
1038 since their scopes end here,
1039 and add them to BLOCK_VARS. */
1041 for (link = named_labels; link; link = TREE_CHAIN (link))
1043 tree label = TREE_VALUE (link);
1045 if (DECL_INITIAL (label) == 0)
1047 error_with_decl (label, "label `%s' used but not defined");
1048 /* Avoid crashing later. */
1049 define_label (input_filename, lineno,
1052 else if (warn_unused_label && !TREE_USED (label))
1053 warning_with_decl (label, "label `%s' defined but not used");
1054 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1056 /* Put the labels into the "variables" of the
1057 top-level block, so debugger can see them. */
1058 TREE_CHAIN (label) = BLOCK_VARS (block);
1059 BLOCK_VARS (block) = label;
1063 /* Pop the current level, and free the structure for reuse. */
1065 pop_binding_level (¤t_binding_level);
1067 /* Dispose of the block that we just made inside some higher level. */
1069 DECL_INITIAL (current_function_decl) = block;
1072 if (!block_previously_created)
1073 current_binding_level->blocks
1074 = chainon (current_binding_level->blocks, block);
1076 /* If we did not make a block for the level just exited,
1077 any blocks made for inner levels
1078 (since they cannot be recorded as subblocks in that level)
1079 must be carried forward so they will later become subblocks
1080 of something else. */
1082 current_binding_level->blocks
1083 = chainon (current_binding_level->blocks, subblocks);
1085 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1086 binding contour so that they point to the appropriate construct, i.e.
1087 either to the current FUNCTION_DECL node, or else to the BLOCK node
1088 we just constructed.
1090 Note that for tagged types whose scope is just the formal parameter
1091 list for some function type specification, we can't properly set
1092 their TYPE_CONTEXTs here, because we don't have a pointer to the
1093 appropriate FUNCTION_TYPE node readily available to us. For those
1094 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1095 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1096 node which will represent the "scope" for these "parameter list local"
1100 for (link = tags; link; link = TREE_CHAIN (link))
1101 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1103 for (link = tags; link; link = TREE_CHAIN (link))
1104 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1107 TREE_USED (block) = 1;
1112 /* Insert BLOCK at the end of the list of subblocks of the
1113 current binding level. This is used when a BIND_EXPR is expanded,
1114 to handle the BLOCK node inside the BIND_EXPR. */
1117 insert_block (block)
1120 TREE_USED (block) = 1;
1121 current_binding_level->blocks
1122 = chainon (current_binding_level->blocks, block);
1125 /* Set the BLOCK node for the innermost scope
1126 (the one we are currently in). */
1132 current_binding_level->this_block = block;
1133 current_binding_level->names = chainon (current_binding_level->names,
1134 BLOCK_VARS (block));
1135 current_binding_level->blocks = chainon (current_binding_level->blocks,
1136 BLOCK_SUBBLOCKS (block));
1142 struct binding_level *newlevel;
1144 newlevel = make_binding_level ();
1146 /* Add this level to the front of the chain (stack) of label levels. */
1148 newlevel->level_chain = label_level_chain;
1149 label_level_chain = newlevel;
1151 newlevel->names = named_labels;
1152 newlevel->shadowed = shadowed_labels;
1154 shadowed_labels = 0;
1160 struct binding_level *level = label_level_chain;
1163 /* Clear out the definitions of the declared labels in this level.
1164 Leave in the list any ordinary, non-declared labels. */
1165 for (link = named_labels, prev = 0; link;)
1167 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1169 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1171 error_with_decl (TREE_VALUE (link),
1172 "label `%s' used but not defined");
1173 /* Avoid crashing later. */
1174 define_label (input_filename, lineno,
1175 DECL_NAME (TREE_VALUE (link)));
1177 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1178 warning_with_decl (TREE_VALUE (link),
1179 "label `%s' defined but not used");
1180 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1182 /* Delete this element from the list. */
1183 link = TREE_CHAIN (link);
1185 TREE_CHAIN (prev) = link;
1187 named_labels = link;
1192 link = TREE_CHAIN (link);
1196 /* Bring back all the labels that were shadowed. */
1197 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1198 if (DECL_NAME (TREE_VALUE (link)) != 0)
1199 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1200 = TREE_VALUE (link);
1202 named_labels = chainon (named_labels, level->names);
1203 shadowed_labels = level->shadowed;
1205 /* Pop the current level, and free the structure for reuse. */
1206 pop_binding_level (&label_level_chain);
1209 /* Push a definition or a declaration of struct, union or enum tag "name".
1210 "type" should be the type node.
1211 We assume that the tag "name" is not already defined.
1213 Note that the definition may really be just a forward reference.
1214 In that case, the TYPE_SIZE will be zero. */
1217 pushtag (name, type)
1220 struct binding_level *b;
1222 /* Find the proper binding level for this type tag. */
1224 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1229 /* Record the identifier as the type's name if it has none. */
1231 if (TYPE_NAME (type) == 0)
1232 TYPE_NAME (type) = name;
1235 b->tags = tree_cons (name, type, b->tags);
1237 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1238 tagged type we just added to the current binding level. This fake
1239 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1240 to output a representation of a tagged type, and it also gives
1241 us a convenient place to record the "scope start" address for the
1244 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1246 /* An approximation for now, so we can tell this is a function-scope tag.
1247 This will be updated in poplevel. */
1248 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1251 /* Handle when a new declaration NEWDECL
1252 has the same name as an old one OLDDECL
1253 in the same binding contour.
1254 Prints an error message if appropriate.
1256 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1257 Otherwise, return 0.
1259 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1260 and OLDDECL is in an outer binding level and should thus not be changed. */
1263 duplicate_decls (newdecl, olddecl, different_binding_level)
1264 tree newdecl, olddecl;
1265 int different_binding_level;
1267 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1268 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1269 && DECL_INITIAL (newdecl) != 0);
1270 tree oldtype = TREE_TYPE (olddecl);
1271 tree newtype = TREE_TYPE (newdecl);
1274 if (DECL_P (olddecl))
1276 if (TREE_CODE (newdecl) == FUNCTION_DECL
1277 && TREE_CODE (olddecl) == FUNCTION_DECL
1278 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1280 if (DECL_DECLARED_INLINE_P (newdecl)
1281 && DECL_UNINLINABLE (newdecl)
1282 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1283 /* Already warned elsewhere. */;
1284 else if (DECL_DECLARED_INLINE_P (olddecl)
1285 && DECL_UNINLINABLE (olddecl)
1286 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1287 /* Already warned. */;
1288 else if (DECL_DECLARED_INLINE_P (newdecl)
1289 && ! DECL_DECLARED_INLINE_P (olddecl)
1290 && DECL_UNINLINABLE (olddecl)
1291 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1293 warning_with_decl (newdecl,
1294 "function `%s' redeclared as inline");
1295 warning_with_decl (olddecl,
1296 "previous declaration of function `%s' with attribute noinline");
1298 else if (DECL_DECLARED_INLINE_P (olddecl)
1299 && DECL_UNINLINABLE (newdecl)
1300 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1302 warning_with_decl (newdecl,
1303 "function `%s' redeclared with attribute noinline");
1304 warning_with_decl (olddecl,
1305 "previous declaration of function `%s' was inline");
1309 DECL_ATTRIBUTES (newdecl)
1310 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1313 if (TREE_CODE (newtype) == ERROR_MARK
1314 || TREE_CODE (oldtype) == ERROR_MARK)
1317 /* New decl is completely inconsistent with the old one =>
1318 tell caller to replace the old one.
1319 This is always an error except in the case of shadowing a builtin. */
1320 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1322 if (TREE_CODE (olddecl) == FUNCTION_DECL
1323 && (DECL_BUILT_IN (olddecl)
1324 || DECL_BUILT_IN_NONANSI (olddecl)))
1326 /* If you declare a built-in or predefined function name as static,
1327 the old definition is overridden,
1328 but optionally warn this was a bad choice of name. */
1329 if (!TREE_PUBLIC (newdecl))
1333 else if (DECL_BUILT_IN (olddecl))
1334 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1336 warning_with_decl (newdecl, "shadowing library function `%s'");
1338 /* Likewise, if the built-in is not ansi, then programs can
1339 override it even globally without an error. */
1340 else if (! DECL_BUILT_IN (olddecl))
1341 warning_with_decl (newdecl,
1342 "library function `%s' declared as non-function");
1344 else if (DECL_BUILT_IN_NONANSI (olddecl))
1345 warning_with_decl (newdecl,
1346 "built-in function `%s' declared as non-function");
1348 warning_with_decl (newdecl,
1349 "built-in function `%s' declared as non-function");
1353 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1354 error_with_decl (olddecl, "previous declaration of `%s'");
1360 /* For real parm decl following a forward decl,
1361 return 1 so old decl will be reused. */
1362 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1363 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1366 /* The new declaration is the same kind of object as the old one.
1367 The declarations may partially match. Print warnings if they don't
1368 match enough. Ultimately, copy most of the information from the new
1369 decl to the old one, and keep using the old one. */
1371 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
1373 /* A function declaration for a built-in function. */
1374 if (!TREE_PUBLIC (newdecl))
1376 /* If you declare a built-in function name as static, the
1377 built-in definition is overridden,
1378 but optionally warn this was a bad choice of name. */
1380 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1381 /* Discard the old built-in function. */
1384 else if (!types_match)
1386 /* Accept the return type of the new declaration if same modes. */
1387 tree oldreturntype = TREE_TYPE (oldtype);
1388 tree newreturntype = TREE_TYPE (newtype);
1390 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1392 /* Function types may be shared, so we can't just modify
1393 the return type of olddecl's function type. */
1395 = build_function_type (newreturntype,
1396 TYPE_ARG_TYPES (oldtype));
1397 trytype = build_type_attribute_variant (trytype,
1398 TYPE_ATTRIBUTES (oldtype));
1400 types_match = comptypes (newtype, trytype);
1404 /* Accept harmless mismatch in first argument type also.
1405 This is for the ffs and fprintf builtins. */
1406 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1407 && TYPE_ARG_TYPES (oldtype) != 0
1408 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1409 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1410 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1411 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1413 /* Function types may be shared, so we can't just modify
1414 the return type of olddecl's function type. */
1416 = build_function_type (TREE_TYPE (oldtype),
1417 tree_cons (NULL_TREE,
1418 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1419 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1420 trytype = build_type_attribute_variant (trytype,
1421 TYPE_ATTRIBUTES (oldtype));
1423 types_match = comptypes (newtype, trytype);
1427 if (! different_binding_level)
1428 TREE_TYPE (olddecl) = oldtype;
1430 else if (TYPE_ARG_TYPES (oldtype) == NULL
1431 && TYPE_ARG_TYPES (newtype) != NULL)
1433 /* For bcmp, bzero, fputs the builtin type has arguments not
1434 specified. Use the ones from the prototype so that type checking
1435 is done for them. */
1437 = build_function_type (TREE_TYPE (oldtype),
1438 TYPE_ARG_TYPES (newtype));
1439 trytype = build_type_attribute_variant (trytype,
1440 TYPE_ATTRIBUTES (oldtype));
1443 if (! different_binding_level)
1444 TREE_TYPE (olddecl) = oldtype;
1448 /* If types don't match for a built-in, throw away the built-in. */
1449 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1453 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1454 && DECL_SOURCE_LINE (olddecl) == 0)
1456 /* A function declaration for a predeclared function
1457 that isn't actually built in. */
1458 if (!TREE_PUBLIC (newdecl))
1460 /* If you declare it as static, the
1461 default definition is overridden. */
1464 else if (!types_match)
1466 /* If the types don't match, preserve volatility indication.
1467 Later on, we will discard everything else about the
1468 default declaration. */
1469 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1472 /* Permit char *foo () to match void *foo (...) if not pedantic,
1473 if one of them came from a system header file. */
1474 else if (!types_match
1475 && TREE_CODE (olddecl) == FUNCTION_DECL
1476 && TREE_CODE (newdecl) == FUNCTION_DECL
1477 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1478 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1479 && (DECL_IN_SYSTEM_HEADER (olddecl)
1480 || DECL_IN_SYSTEM_HEADER (newdecl))
1481 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1482 && TYPE_ARG_TYPES (oldtype) == 0
1483 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1484 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1486 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1487 && TYPE_ARG_TYPES (newtype) == 0
1488 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1489 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1492 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1493 /* Make sure we keep void * as ret type, not char *. */
1494 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1495 TREE_TYPE (newdecl) = newtype = oldtype;
1497 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1498 we will come back here again. */
1499 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1501 else if (!types_match
1502 /* Permit char *foo (int, ...); followed by char *foo ();
1504 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1506 /* Return types must still match. */
1507 && comptypes (TREE_TYPE (oldtype),
1508 TREE_TYPE (newtype))
1509 && TYPE_ARG_TYPES (newtype) == 0))
1511 error_with_decl (newdecl, "conflicting types for `%s'");
1512 /* Check for function type mismatch
1513 involving an empty arglist vs a nonempty one. */
1514 if (TREE_CODE (olddecl) == FUNCTION_DECL
1515 && comptypes (TREE_TYPE (oldtype),
1516 TREE_TYPE (newtype))
1517 && ((TYPE_ARG_TYPES (oldtype) == 0
1518 && DECL_INITIAL (olddecl) == 0)
1520 (TYPE_ARG_TYPES (newtype) == 0
1521 && DECL_INITIAL (newdecl) == 0)))
1523 /* Classify the problem further. */
1524 tree t = TYPE_ARG_TYPES (oldtype);
1526 t = TYPE_ARG_TYPES (newtype);
1527 for (; t; t = TREE_CHAIN (t))
1529 tree type = TREE_VALUE (t);
1531 if (TREE_CHAIN (t) == 0
1532 && TYPE_MAIN_VARIANT (type) != void_type_node)
1534 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1538 if (c_type_promotes_to (type) != type)
1540 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1545 error_with_decl (olddecl, "previous declaration of `%s'");
1549 errmsg = redeclaration_error_message (newdecl, olddecl);
1555 error_with_decl (newdecl, "redefinition of `%s'");
1558 error_with_decl (newdecl, "redeclaration of `%s'");
1561 error_with_decl (newdecl, "conflicting declarations of `%s'");
1567 error_with_decl (olddecl,
1568 ((DECL_INITIAL (olddecl)
1569 && current_binding_level == global_binding_level)
1570 ? "`%s' previously defined here"
1571 : "`%s' previously declared here"));
1574 else if (TREE_CODE (newdecl) == TYPE_DECL
1575 && (DECL_IN_SYSTEM_HEADER (olddecl)
1576 || DECL_IN_SYSTEM_HEADER (newdecl)))
1578 warning_with_decl (newdecl, "redefinition of `%s'");
1581 ((DECL_INITIAL (olddecl)
1582 && current_binding_level == global_binding_level)
1583 ? "`%s' previously defined here"
1584 : "`%s' previously declared here"));
1586 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1587 && DECL_INITIAL (olddecl) != 0
1588 && TYPE_ARG_TYPES (oldtype) == 0
1589 && TYPE_ARG_TYPES (newtype) != 0
1590 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1594 /* Prototype decl follows defn w/o prototype. */
1596 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1597 type = TYPE_ARG_TYPES (newtype),
1600 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1602 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1603 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1605 warning_with_decl (newdecl, "prototype for `%s' follows");
1606 warning_with_decl (olddecl, "non-prototype definition here");
1609 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1610 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1612 error_with_decl (newdecl,
1613 "prototype for `%s' follows and number of arguments doesn't match");
1614 error_with_decl (olddecl, "non-prototype definition here");
1618 /* Type for passing arg must be consistent
1619 with that declared for the arg. */
1620 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1622 error_with_decl (newdecl,
1623 "prototype for `%s' follows and argument %d doesn't match",
1625 error_with_decl (olddecl, "non-prototype definition here");
1631 /* Warn about mismatches in various flags. */
1634 /* Warn if function is now inline
1635 but was previously declared not inline and has been called. */
1636 if (TREE_CODE (olddecl) == FUNCTION_DECL
1637 && ! DECL_DECLARED_INLINE_P (olddecl)
1638 && DECL_DECLARED_INLINE_P (newdecl)
1639 && TREE_USED (olddecl))
1640 warning_with_decl (newdecl,
1641 "`%s' declared inline after being called");
1642 if (TREE_CODE (olddecl) == FUNCTION_DECL
1643 && ! DECL_DECLARED_INLINE_P (olddecl)
1644 && DECL_DECLARED_INLINE_P (newdecl)
1645 && DECL_INITIAL (olddecl) != 0)
1646 warning_with_decl (newdecl,
1647 "`%s' declared inline after its definition");
1649 /* If pedantic, warn when static declaration follows a non-static
1650 declaration. Otherwise, do so only for functions. */
1651 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1652 && TREE_PUBLIC (olddecl)
1653 && !TREE_PUBLIC (newdecl))
1654 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1656 /* If warn_traditional, warn when a non-static function
1657 declaration follows a static one. */
1658 if (warn_traditional && !in_system_header
1659 && TREE_CODE (olddecl) == FUNCTION_DECL
1660 && !TREE_PUBLIC (olddecl)
1661 && TREE_PUBLIC (newdecl))
1662 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1664 /* Warn when const declaration follows a non-const
1665 declaration, but not for functions. */
1666 if (TREE_CODE (olddecl) != FUNCTION_DECL
1667 && !TREE_READONLY (olddecl)
1668 && TREE_READONLY (newdecl))
1669 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1670 /* These bits are logically part of the type, for variables.
1671 But not for functions
1672 (where qualifiers are not valid ANSI anyway). */
1673 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1674 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1675 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1676 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1680 /* Optionally warn about more than one declaration for the same name. */
1681 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1682 /* Don't warn about a function declaration
1683 followed by a definition. */
1684 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1685 && DECL_INITIAL (olddecl) == 0)
1686 /* Don't warn about extern decl followed by (tentative) definition. */
1687 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1689 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1690 warning_with_decl (olddecl, "previous declaration of `%s'");
1693 /* Copy all the DECL_... slots specified in the new decl
1694 except for any that we copy here from the old type.
1696 Past this point, we don't change OLDTYPE and NEWTYPE
1697 even if we change the types of NEWDECL and OLDDECL. */
1701 /* When copying info to olddecl, we store into write_olddecl
1702 instead. This allows us to avoid modifying olddecl when
1703 different_binding_level is true. */
1704 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1706 /* Merge the data types specified in the two decls. */
1707 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1709 if (different_binding_level)
1711 if (TYPE_ARG_TYPES (oldtype) != 0
1712 && TYPE_ARG_TYPES (newtype) == 0)
1713 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1716 = build_type_attribute_variant
1718 merge_attributes (TYPE_ATTRIBUTES (newtype),
1719 TYPE_ATTRIBUTES (oldtype)));
1723 = TREE_TYPE (olddecl)
1724 = common_type (newtype, oldtype);
1727 /* Lay the type out, unless already done. */
1728 if (oldtype != TREE_TYPE (newdecl))
1730 if (TREE_TYPE (newdecl) != error_mark_node)
1731 layout_type (TREE_TYPE (newdecl));
1732 if (TREE_CODE (newdecl) != FUNCTION_DECL
1733 && TREE_CODE (newdecl) != TYPE_DECL
1734 && TREE_CODE (newdecl) != CONST_DECL)
1735 layout_decl (newdecl, 0);
1739 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1740 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1741 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1742 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1743 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1744 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1746 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1747 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1751 /* Keep the old rtl since we can safely use it. */
1752 COPY_DECL_RTL (olddecl, newdecl);
1754 /* Merge the type qualifiers. */
1755 if (TREE_READONLY (newdecl))
1756 TREE_READONLY (write_olddecl) = 1;
1758 if (TREE_THIS_VOLATILE (newdecl))
1760 TREE_THIS_VOLATILE (write_olddecl) = 1;
1761 if (TREE_CODE (newdecl) == VAR_DECL
1762 /* If an automatic variable is re-declared in the same
1763 function scope, but the old declaration was not
1764 volatile, make_var_volatile() would crash because the
1765 variable would have been assigned to a pseudo, not a
1766 MEM. Since this duplicate declaration is invalid
1767 anyway, we just skip the call. */
1769 make_var_volatile (newdecl);
1772 /* Keep source location of definition rather than declaration. */
1773 /* When called with different_binding_level set, keep the old
1774 information so that meaningful diagnostics can be given. */
1775 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1776 && ! different_binding_level)
1778 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1779 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1782 /* Merge the unused-warning information. */
1783 if (DECL_IN_SYSTEM_HEADER (olddecl))
1784 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1785 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1786 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1788 /* Merge the initialization information. */
1789 /* When called with different_binding_level set, don't copy over
1790 DECL_INITIAL, so that we don't accidentally change function
1791 declarations into function definitions. */
1792 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1793 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1795 /* Merge the section attribute.
1796 We want to issue an error if the sections conflict but that must be
1797 done later in decl_attributes since we are called before attributes
1799 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1800 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1802 /* Copy the assembler name.
1803 Currently, it can only be defined in the prototype. */
1804 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1806 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1808 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1809 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1810 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1811 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1812 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1815 /* If cannot merge, then use the new type and qualifiers,
1816 and don't preserve the old rtl. */
1817 else if (! different_binding_level)
1819 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1820 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1821 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1822 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1825 /* Merge the storage class information. */
1826 merge_weak (newdecl, olddecl);
1828 /* For functions, static overrides non-static. */
1829 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1831 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1832 /* This is since we don't automatically
1833 copy the attributes of NEWDECL into OLDDECL. */
1834 /* No need to worry about different_binding_level here because
1835 then TREE_PUBLIC (newdecl) was true. */
1836 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1837 /* If this clears `static', clear it in the identifier too. */
1838 if (! TREE_PUBLIC (olddecl))
1839 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1841 if (DECL_EXTERNAL (newdecl))
1843 if (! different_binding_level)
1845 /* Don't mess with these flags on local externs; they remain
1846 external even if there's a declaration at file scope which
1848 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1849 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1851 /* An extern decl does not override previous storage class. */
1852 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1853 if (! DECL_EXTERNAL (newdecl))
1854 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1858 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1859 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1862 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1864 /* If we're redefining a function previously defined as extern
1865 inline, make sure we emit debug info for the inline before we
1866 throw it away, in case it was inlined into a function that hasn't
1867 been written out yet. */
1868 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1870 (*debug_hooks->outlining_inline_function) (olddecl);
1872 /* The new defn must not be inline. */
1873 DECL_INLINE (newdecl) = 0;
1874 DECL_UNINLINABLE (newdecl) = 1;
1878 /* If either decl says `inline', this fn is inline,
1879 unless its definition was passed already. */
1880 if (DECL_DECLARED_INLINE_P (newdecl)
1881 || DECL_DECLARED_INLINE_P (olddecl))
1882 DECL_DECLARED_INLINE_P (newdecl) = 1;
1884 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1885 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1888 if (DECL_BUILT_IN (olddecl))
1890 /* Get rid of any built-in function if new arg types don't match it
1891 or if we have a function definition. */
1892 if (! types_match || new_is_definition)
1894 if (! different_binding_level)
1896 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1897 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1902 /* If redeclaring a builtin function, and not a definition,
1903 it stays built in. */
1904 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1905 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1909 /* Also preserve various other info from the definition. */
1910 if (! new_is_definition)
1912 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1913 /* When called with different_binding_level set, don't copy over
1914 DECL_INITIAL, so that we don't accidentally change function
1915 declarations into function definitions. */
1916 if (! different_binding_level)
1917 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1918 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1919 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1920 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1921 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1923 /* Set DECL_INLINE on the declaration if we've got a body
1924 from which to instantiate. */
1925 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1927 DECL_INLINE (newdecl) = 1;
1928 DECL_ABSTRACT_ORIGIN (newdecl)
1929 = (different_binding_level
1930 ? DECL_ORIGIN (olddecl)
1931 : DECL_ABSTRACT_ORIGIN (olddecl));
1936 /* If a previous declaration said inline, mark the
1937 definition as inlinable. */
1938 if (DECL_DECLARED_INLINE_P (newdecl)
1939 && ! DECL_UNINLINABLE (newdecl))
1940 DECL_INLINE (newdecl) = 1;
1943 if (different_binding_level)
1946 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1947 But preserve OLDDECL's DECL_UID. */
1949 unsigned olddecl_uid = DECL_UID (olddecl);
1951 memcpy ((char *) olddecl + sizeof (struct tree_common),
1952 (char *) newdecl + sizeof (struct tree_common),
1953 sizeof (struct tree_decl) - sizeof (struct tree_common));
1954 DECL_UID (olddecl) = olddecl_uid;
1957 /* NEWDECL contains the merged attribute lists.
1958 Update OLDDECL to be the same. */
1959 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1964 /* Check whether decl-node X shadows an existing declaration.
1965 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1966 which might be a NULL_TREE. */
1968 warn_if_shadowing (x, oldlocal)
1973 if (DECL_EXTERNAL (x))
1976 name = DECL_NAME (x);
1978 /* Warn if shadowing an argument at the top level of the body. */
1980 /* This warning doesn't apply to the parms of a nested fcn. */
1981 && ! current_binding_level->parm_flag
1982 /* Check that this is one level down from the parms. */
1983 && current_binding_level->level_chain->parm_flag
1984 /* Check that the decl being shadowed
1985 comes from the parm level, one level up. */
1986 && chain_member (oldlocal, current_binding_level->level_chain->names))
1988 if (TREE_CODE (oldlocal) == PARM_DECL)
1989 pedwarn ("declaration of `%s' shadows a parameter",
1990 IDENTIFIER_POINTER (name));
1992 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
1993 IDENTIFIER_POINTER (name));
1995 /* Maybe warn if shadowing something else. */
1996 else if (warn_shadow
1997 /* No shadow warnings for internally generated vars. */
1998 && DECL_SOURCE_LINE (x) != 0
1999 /* No shadow warnings for vars made for inlining. */
2000 && ! DECL_FROM_INLINE (x))
2002 if (TREE_CODE (x) == PARM_DECL
2003 && current_binding_level->level_chain->parm_flag)
2004 /* Don't warn about the parm names in function declarator
2005 within a function declarator.
2006 It would be nice to avoid warning in any function
2007 declarator in a declaration, as opposed to a definition,
2008 but there is no way to tell it's not a definition. */
2012 if (TREE_CODE (oldlocal) == PARM_DECL)
2013 shadow_warning ("a parameter", name, oldlocal);
2015 shadow_warning ("a previous local", name, oldlocal);
2017 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2018 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2019 shadow_warning ("a global declaration", name,
2020 IDENTIFIER_GLOBAL_VALUE (name));
2024 /* Record a decl-node X as belonging to the current lexical scope.
2025 Check for errors (such as an incompatible declaration for the same
2026 name already seen in the same scope).
2028 Returns either X or an old decl for the same name.
2029 If an old decl is returned, it may have been smashed
2030 to agree with what X says. */
2037 tree name = DECL_NAME (x);
2038 struct binding_level *b = current_binding_level;
2040 /* Functions need the lang_decl data. */
2041 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2042 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2043 ggc_alloc_cleared (sizeof (struct lang_decl));
2045 DECL_CONTEXT (x) = current_function_decl;
2046 /* A local extern declaration for a function doesn't constitute nesting.
2047 A local auto declaration does, since it's a forward decl
2048 for a nested function coming later. */
2049 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2050 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2051 DECL_CONTEXT (x) = 0;
2055 int different_binding_level = 0;
2057 if (warn_nested_externs
2058 && DECL_EXTERNAL (x)
2059 && b != global_binding_level
2060 && x != IDENTIFIER_IMPLICIT_DECL (name)
2061 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2062 && !DECL_IN_SYSTEM_HEADER (x))
2063 warning ("nested extern declaration of `%s'",
2064 IDENTIFIER_POINTER (name));
2066 t = lookup_name_current_level (name);
2067 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2069 t = IDENTIFIER_GLOBAL_VALUE (name);
2070 /* Type decls at global scope don't conflict with externs declared
2071 inside lexical blocks. */
2072 if (! t || TREE_CODE (t) == TYPE_DECL)
2073 /* If there's no visible global declaration, try for an
2075 t = IDENTIFIER_LIMBO_VALUE (name);
2076 different_binding_level = 1;
2078 if (t != 0 && t == error_mark_node)
2079 /* error_mark_node is 0 for a while during initialization! */
2082 error_with_decl (x, "`%s' used prior to declaration");
2085 /* If this decl is `static' and an implicit decl was seen previously,
2087 if (TREE_PUBLIC (name)
2088 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2089 sets this for all functions. */
2090 && ! TREE_PUBLIC (x)
2091 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2092 /* We used to warn also for explicit extern followed by static,
2093 but sometimes you need to do it that way. */
2094 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2096 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2097 IDENTIFIER_POINTER (name));
2098 pedwarn_with_file_and_line
2099 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2100 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2101 "previous declaration of `%s'",
2102 IDENTIFIER_POINTER (name));
2103 TREE_THIS_VOLATILE (name) = 1;
2106 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2108 if (TREE_CODE (t) == PARM_DECL)
2110 /* Don't allow more than one "real" duplicate
2111 of a forward parm decl. */
2112 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2118 /* If we are processing a typedef statement, generate a whole new
2119 ..._TYPE node (which will be just an variant of the existing
2120 ..._TYPE node with identical properties) and then install the
2121 TYPE_DECL node generated to represent the typedef name as the
2122 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2124 The whole point here is to end up with a situation where each
2125 and every ..._TYPE node the compiler creates will be uniquely
2126 associated with AT MOST one node representing a typedef name.
2127 This way, even though the compiler substitutes corresponding
2128 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2129 early on, later parts of the compiler can always do the reverse
2130 translation and get back the corresponding typedef name. For
2133 typedef struct S MY_TYPE;
2136 Later parts of the compiler might only know that `object' was of
2137 type `struct S' if it were not for code just below. With this
2138 code however, later parts of the compiler see something like:
2140 struct S' == struct S
2141 typedef struct S' MY_TYPE;
2144 And they can then deduce (from the node for type struct S') that
2145 the original object declaration was:
2149 Being able to do this is important for proper support of protoize,
2150 and also for generating precise symbolic debugging information
2151 which takes full account of the programmer's (typedef) vocabulary.
2153 Obviously, we don't want to generate a duplicate ..._TYPE node if
2154 the TYPE_DECL node that we are now processing really represents a
2155 standard built-in type.
2157 Since all standard types are effectively declared at line zero
2158 in the source file, we can easily check to see if we are working
2159 on a standard type by checking the current value of lineno. */
2161 if (TREE_CODE (x) == TYPE_DECL)
2163 if (DECL_SOURCE_LINE (x) == 0)
2165 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2166 TYPE_NAME (TREE_TYPE (x)) = x;
2168 else if (TREE_TYPE (x) != error_mark_node
2169 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2171 tree tt = TREE_TYPE (x);
2172 DECL_ORIGINAL_TYPE (x) = tt;
2173 tt = build_type_copy (tt);
2175 TREE_USED (tt) = TREE_USED (x);
2180 /* Multiple external decls of the same identifier ought to match.
2181 We get warnings about inline functions where they are defined.
2182 Avoid duplicate warnings where they are used. */
2184 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2188 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2189 /* Decls in limbo are always extern, so no need to check that. */
2190 decl = IDENTIFIER_LIMBO_VALUE (name);
2194 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2195 /* If old decl is built-in, we already warned if we should. */
2196 && !DECL_BUILT_IN (decl))
2198 pedwarn_with_decl (x,
2199 "type mismatch with previous external decl");
2200 pedwarn_with_decl (decl, "previous external decl of `%s'");
2204 /* If a function has had an implicit declaration, and then is defined,
2205 make sure they are compatible. */
2207 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2208 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2209 && TREE_CODE (x) == FUNCTION_DECL
2210 && ! comptypes (TREE_TYPE (x),
2211 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2213 warning_with_decl (x, "type mismatch with previous implicit declaration");
2214 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2215 "previous implicit declaration of `%s'");
2218 /* This name is new in its binding level.
2219 Install the new declaration and return it. */
2220 if (b == global_binding_level)
2222 /* Install a global value. */
2224 /* If the first global decl has external linkage,
2225 warn if we later see static one. */
2226 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2227 TREE_PUBLIC (name) = 1;
2229 IDENTIFIER_GLOBAL_VALUE (name) = x;
2231 /* We no longer care about any previous block level declarations. */
2232 IDENTIFIER_LIMBO_VALUE (name) = 0;
2234 /* Don't forget if the function was used via an implicit decl. */
2235 if (IDENTIFIER_IMPLICIT_DECL (name)
2236 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2237 TREE_USED (x) = 1, TREE_USED (name) = 1;
2239 /* Don't forget if its address was taken in that way. */
2240 if (IDENTIFIER_IMPLICIT_DECL (name)
2241 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2242 TREE_ADDRESSABLE (x) = 1;
2244 /* Warn about mismatches against previous implicit decl. */
2245 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2246 /* If this real decl matches the implicit, don't complain. */
2247 && ! (TREE_CODE (x) == FUNCTION_DECL
2248 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2249 == integer_type_node)))
2250 pedwarn ("`%s' was previously implicitly declared to return `int'",
2251 IDENTIFIER_POINTER (name));
2253 /* If this decl is `static' and an `extern' was seen previously,
2254 that is erroneous. */
2255 if (TREE_PUBLIC (name)
2256 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2258 /* Okay to redeclare an ANSI built-in as static. */
2259 if (t != 0 && DECL_BUILT_IN (t))
2261 /* Okay to declare a non-ANSI built-in as anything. */
2262 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2264 /* Okay to have global type decl after an earlier extern
2265 declaration inside a lexical block. */
2266 else if (TREE_CODE (x) == TYPE_DECL)
2268 else if (IDENTIFIER_IMPLICIT_DECL (name))
2270 if (! TREE_THIS_VOLATILE (name))
2271 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2272 IDENTIFIER_POINTER (name));
2275 pedwarn ("`%s' was declared `extern' and later `static'",
2276 IDENTIFIER_POINTER (name));
2281 /* Here to install a non-global value. */
2282 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2283 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2285 IDENTIFIER_LOCAL_VALUE (name) = x;
2287 /* If this is an extern function declaration, see if we
2288 have a global definition or declaration for the function. */
2291 && TREE_CODE (x) == FUNCTION_DECL
2292 && TREE_CODE (oldglobal) == FUNCTION_DECL
2293 && DECL_EXTERNAL (x)
2294 && ! DECL_DECLARED_INLINE_P (x))
2296 /* We have one. Their types must agree. */
2297 if (! comptypes (TREE_TYPE (x),
2298 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2299 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2302 /* Inner extern decl is inline if global one is.
2303 Copy enough to really inline it. */
2304 if (DECL_DECLARED_INLINE_P (oldglobal))
2306 DECL_DECLARED_INLINE_P (x)
2307 = DECL_DECLARED_INLINE_P (oldglobal);
2308 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2309 DECL_INITIAL (x) = (current_function_decl == oldglobal
2310 ? 0 : DECL_INITIAL (oldglobal));
2311 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2312 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2313 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2314 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2315 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2316 DECL_ABSTRACT_ORIGIN (x)
2317 = DECL_ABSTRACT_ORIGIN (oldglobal);
2319 /* Inner extern decl is built-in if global one is. */
2320 if (DECL_BUILT_IN (oldglobal))
2322 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2323 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2325 /* Keep the arg types from a file-scope fcn defn. */
2326 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2327 && DECL_INITIAL (oldglobal)
2328 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2329 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2334 /* This case is probably sometimes the right thing to do. */
2335 /* If we have a local external declaration,
2336 then any file-scope declaration should not
2337 have been static. */
2338 if (oldlocal == 0 && oldglobal != 0
2339 && !TREE_PUBLIC (oldglobal)
2340 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2341 warning ("`%s' locally external but globally static",
2342 IDENTIFIER_POINTER (name));
2345 /* If we have a local external declaration,
2346 and no file-scope declaration has yet been seen,
2347 then if we later have a file-scope decl it must not be static. */
2349 && DECL_EXTERNAL (x)
2353 TREE_PUBLIC (name) = 1;
2355 /* Save this decl, so that we can do type checking against
2356 other decls after it falls out of scope.
2358 Only save it once. This prevents temporary decls created in
2359 expand_inline_function from being used here, since this
2360 will have been set when the inline function was parsed.
2361 It also helps give slightly better warnings. */
2362 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2363 IDENTIFIER_LIMBO_VALUE (name) = x;
2366 warn_if_shadowing (x, oldlocal);
2368 /* If storing a local value, there may already be one (inherited).
2369 If so, record it for restoration when this binding level ends. */
2371 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2374 /* Keep list of variables in this level with incomplete type.
2375 If the input is erroneous, we can have error_mark in the type
2376 slot (e.g. "f(void a, ...)") - that doesn't count as an
2378 if (TREE_TYPE (x) != error_mark_node
2379 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2381 tree element = TREE_TYPE (x);
2383 while (TREE_CODE (element) == ARRAY_TYPE)
2384 element = TREE_TYPE (element);
2385 if (TREE_CODE (element) == RECORD_TYPE
2386 || TREE_CODE (element) == UNION_TYPE)
2387 b->incomplete_list = tree_cons (NULL_TREE, x, b->incomplete_list);
2391 /* Put decls on list in reverse order.
2392 We will reverse them later if necessary. */
2393 TREE_CHAIN (x) = b->names;
2399 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2402 pushdecl_top_level (x)
2406 struct binding_level *b = current_binding_level;
2408 current_binding_level = global_binding_level;
2410 current_binding_level = b;
2414 /* Generate an implicit declaration for identifier FUNCTIONID
2415 as a function of type int (). Print a warning if appropriate. */
2418 implicitly_declare (functionid)
2422 int traditional_warning = 0;
2423 /* Only one "implicit declaration" warning per identifier. */
2424 int implicit_warning;
2426 /* We used to reuse an old implicit decl here,
2427 but this loses with inline functions because it can clobber
2428 the saved decl chains. */
2430 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2431 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2434 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2436 /* Warn of implicit decl following explicit local extern decl.
2437 This is probably a program designed for traditional C. */
2438 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2439 traditional_warning = 1;
2441 /* Warn once of an implicit declaration. */
2442 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2444 DECL_EXTERNAL (decl) = 1;
2445 TREE_PUBLIC (decl) = 1;
2447 /* Record that we have an implicit decl and this is it. */
2448 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2450 /* ANSI standard says implicit declarations are in the innermost block.
2451 So we record the decl in the standard fashion. */
2454 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2455 maybe_objc_check_decl (decl);
2457 rest_of_decl_compilation (decl, NULL, 0, 0);
2459 if (implicit_warning)
2460 implicit_decl_warning (functionid);
2461 else if (warn_traditional && traditional_warning)
2462 warning ("function `%s' was previously declared within a block",
2463 IDENTIFIER_POINTER (functionid));
2465 /* Write a record describing this implicit function declaration to the
2466 prototypes file (if requested). */
2468 gen_aux_info_record (decl, 0, 1, 0);
2470 /* Possibly apply some default attributes to this implicit declaration. */
2471 decl_attributes (&decl, NULL_TREE, 0);
2477 implicit_decl_warning (id)
2480 const char *name = IDENTIFIER_POINTER (id);
2481 if (mesg_implicit_function_declaration == 2)
2482 error ("implicit declaration of function `%s'", name);
2483 else if (mesg_implicit_function_declaration == 1)
2484 warning ("implicit declaration of function `%s'", name);
2487 /* Return zero if the declaration NEWDECL is valid
2488 when the declaration OLDDECL (assumed to be for the same name)
2489 has already been seen.
2490 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2491 and 3 if it is a conflicting declaration. */
2494 redeclaration_error_message (newdecl, olddecl)
2495 tree newdecl, olddecl;
2497 if (TREE_CODE (newdecl) == TYPE_DECL)
2499 /* Do not complain about type redeclarations where at least one
2500 declaration was in a system header. */
2501 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2505 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2507 /* Declarations of functions can insist on internal linkage
2508 but they can't be inconsistent with internal linkage,
2509 so there can be no error on that account.
2510 However defining the same name twice is no good. */
2511 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2512 /* However, defining once as extern inline and a second
2513 time in another way is ok. */
2514 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2515 && ! (DECL_DECLARED_INLINE_P (newdecl)
2516 && DECL_EXTERNAL (newdecl))))
2520 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2522 /* Objects declared at top level: */
2523 /* If at least one is a reference, it's ok. */
2524 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2526 /* Reject two definitions. */
2527 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2529 /* Now we have two tentative defs, or one tentative and one real def. */
2530 /* Insist that the linkage match. */
2531 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2535 else if (current_binding_level->parm_flag
2536 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2540 /* Newdecl has block scope. If olddecl has block scope also, then
2541 reject two definitions, and reject a definition together with an
2542 external reference. Otherwise, it is OK, because newdecl must
2543 be an extern reference to olddecl. */
2544 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2545 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2551 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2552 Create one if none exists so far for the current function.
2553 This function is called for both label definitions and label references. */
2559 tree decl = IDENTIFIER_LABEL_VALUE (id);
2561 if (current_function_decl == 0)
2563 error ("label %s referenced outside of any function",
2564 IDENTIFIER_POINTER (id));
2568 /* Use a label already defined or ref'd with this name. */
2571 /* But not if it is inherited and wasn't declared to be inheritable. */
2572 if (DECL_CONTEXT (decl) != current_function_decl
2573 && ! C_DECLARED_LABEL_FLAG (decl))
2574 return shadow_label (id);
2578 decl = build_decl (LABEL_DECL, id, void_type_node);
2580 /* A label not explicitly declared must be local to where it's ref'd. */
2581 DECL_CONTEXT (decl) = current_function_decl;
2583 DECL_MODE (decl) = VOIDmode;
2585 /* Say where one reference is to the label,
2586 for the sake of the error if it is not defined. */
2587 DECL_SOURCE_LINE (decl) = lineno;
2588 DECL_SOURCE_FILE (decl) = input_filename;
2590 IDENTIFIER_LABEL_VALUE (id) = decl;
2592 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2597 /* Make a label named NAME in the current function,
2598 shadowing silently any that may be inherited from containing functions
2599 or containing scopes.
2601 Note that valid use, if the label being shadowed
2602 comes from another scope in the same function,
2603 requires calling declare_nonlocal_label right away. */
2609 tree decl = IDENTIFIER_LABEL_VALUE (name);
2615 /* Check to make sure that the label hasn't already been declared
2616 at this label scope */
2617 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2618 if (TREE_VALUE (dup) == decl)
2620 error ("duplicate label declaration `%s'",
2621 IDENTIFIER_POINTER (name));
2622 error_with_decl (TREE_VALUE (dup),
2623 "this is a previous declaration");
2624 /* Just use the previous declaration. */
2625 return lookup_label (name);
2628 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2629 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2632 return lookup_label (name);
2635 /* Define a label, specifying the location in the source file.
2636 Return the LABEL_DECL node for the label, if the definition is valid.
2637 Otherwise return 0. */
2640 define_label (filename, line, name)
2641 const char *filename;
2645 tree decl = lookup_label (name);
2647 /* If label with this name is known from an outer context, shadow it. */
2648 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2650 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2651 IDENTIFIER_LABEL_VALUE (name) = 0;
2652 decl = lookup_label (name);
2655 if (warn_traditional && !in_system_header && lookup_name (name))
2656 warning_with_file_and_line (filename, line,
2657 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2658 IDENTIFIER_POINTER (name));
2660 if (DECL_INITIAL (decl) != 0)
2662 error_with_file_and_line (filename, line, "duplicate label `%s'",
2663 IDENTIFIER_POINTER (name));
2668 /* Mark label as having been defined. */
2669 DECL_INITIAL (decl) = error_mark_node;
2670 /* Say where in the source. */
2671 DECL_SOURCE_FILE (decl) = filename;
2672 DECL_SOURCE_LINE (decl) = line;
2677 /* Return the list of declarations of the current level.
2678 Note that this list is in reverse order unless/until
2679 you nreverse it; and when you do nreverse it, you must
2680 store the result back using `storedecls' or you will lose. */
2685 return current_binding_level->names;
2688 /* Return the list of type-tags (for structs, etc) of the current level. */
2693 return current_binding_level->tags;
2696 /* Store the list of declarations of the current level.
2697 This is done for the parameter declarations of a function being defined,
2698 after they are modified in the light of any missing parameters. */
2704 current_binding_level->names = decls;
2707 /* Similarly, store the list of tags of the current level. */
2713 current_binding_level->tags = tags;
2716 /* Given NAME, an IDENTIFIER_NODE,
2717 return the structure (or union or enum) definition for that name.
2718 Searches binding levels from BINDING_LEVEL up to the global level.
2719 If THISLEVEL_ONLY is nonzero, searches only the specified context
2720 (but skips any tag-transparent contexts to find one that is
2721 meaningful for tags).
2722 CODE says which kind of type the caller wants;
2723 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2724 If the wrong kind of type is found, an error is reported. */
2727 lookup_tag (code, name, binding_level, thislevel_only)
2728 enum tree_code code;
2729 struct binding_level *binding_level;
2733 struct binding_level *level;
2736 for (level = binding_level; level; level = level->level_chain)
2739 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2741 if (TREE_PURPOSE (tail) == name)
2743 if (TREE_CODE (TREE_VALUE (tail)) != code)
2745 /* Definition isn't the kind we were looking for. */
2746 pending_invalid_xref = name;
2747 pending_invalid_xref_file = input_filename;
2748 pending_invalid_xref_line = lineno;
2749 /* If in the same binding level as a declaration as a tag
2750 of a different type, this must not be allowed to
2751 shadow that tag, so give the error immediately.
2752 (For example, "struct foo; union foo;" is invalid.) */
2754 pending_xref_error ();
2756 return TREE_VALUE (tail);
2759 if (! level->tag_transparent)
2769 /* Print an error message now
2770 for a recent invalid struct, union or enum cross reference.
2771 We don't print them immediately because they are not invalid
2772 when used in the `struct foo;' construct for shadowing. */
2775 pending_xref_error ()
2777 if (pending_invalid_xref != 0)
2778 error_with_file_and_line (pending_invalid_xref_file,
2779 pending_invalid_xref_line,
2780 "`%s' defined as wrong kind of tag",
2781 IDENTIFIER_POINTER (pending_invalid_xref));
2782 pending_invalid_xref = 0;
2785 /* Given a type, find the tag that was defined for it and return the tag name.
2786 Otherwise return 0. */
2789 lookup_tag_reverse (type)
2792 struct binding_level *level;
2794 for (level = current_binding_level; level; level = level->level_chain)
2797 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2799 if (TREE_VALUE (tail) == type)
2800 return TREE_PURPOSE (tail);
2806 /* Look up NAME in the current binding level and its superiors
2807 in the namespace of variables, functions and typedefs.
2808 Return a ..._DECL node of some kind representing its definition,
2809 or return 0 if it is undefined. */
2817 if (current_binding_level != global_binding_level
2818 && IDENTIFIER_LOCAL_VALUE (name))
2819 val = IDENTIFIER_LOCAL_VALUE (name);
2821 val = IDENTIFIER_GLOBAL_VALUE (name);
2825 /* Similar to `lookup_name' but look only at current binding level. */
2828 lookup_name_current_level (name)
2833 if (current_binding_level == global_binding_level)
2834 return IDENTIFIER_GLOBAL_VALUE (name);
2836 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2839 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2840 if (DECL_NAME (t) == name)
2846 /* Create the predefined scalar types of C,
2847 and some nodes representing standard constants (0, 1, (void *) 0).
2848 Initialize the global binding level.
2849 Make definitions for built-in primitive functions. */
2852 c_init_decl_processing ()
2855 tree ptr_ftype_void, ptr_ftype_ptr;
2857 /* Adds some ggc roots, and reserved words for c-parse.in. */
2860 current_function_decl = NULL;
2861 named_labels = NULL;
2862 current_binding_level = NULL_BINDING_LEVEL;
2863 free_binding_level = NULL_BINDING_LEVEL;
2865 /* Make the binding_level structure for global names. */
2867 global_binding_level = current_binding_level;
2869 build_common_tree_nodes (flag_signed_char);
2871 c_common_nodes_and_builtins ();
2873 boolean_type_node = integer_type_node;
2874 boolean_true_node = integer_one_node;
2875 boolean_false_node = integer_zero_node;
2877 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2878 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2879 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2880 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2881 TYPE_PRECISION (c_bool_type_node) = 1;
2882 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2884 c_bool_false_node = build_int_2 (0, 0);
2885 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2886 c_bool_true_node = build_int_2 (1, 0);
2887 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2889 endlink = void_list_node;
2890 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2892 = build_function_type (ptr_type_node,
2893 tree_cons (NULL_TREE, ptr_type_node, endlink));
2895 pedantic_lvalues = pedantic;
2897 make_fname_decl = c_make_fname_decl;
2898 start_fname_decls ();
2901 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2902 decl, NAME is the initialization string and TYPE_DEP indicates whether
2903 NAME depended on the type of the function. As we don't yet implement
2904 delayed emission of static data, we mark the decl as emitted
2905 so it is not placed in the output. Anything using it must therefore pull
2906 out the STRING_CST initializer directly. This does mean that these names
2907 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2910 c_make_fname_decl (id, type_dep)
2914 const char *name = fname_as_string (type_dep);
2915 tree decl, type, init;
2916 size_t length = strlen (name);
2918 type = build_array_type
2919 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2920 build_index_type (size_int (length)));
2922 decl = build_decl (VAR_DECL, id, type);
2923 /* We don't push the decl, so have to set its context here. */
2924 DECL_CONTEXT (decl) = current_function_decl;
2926 TREE_STATIC (decl) = 1;
2927 TREE_READONLY (decl) = 1;
2928 DECL_ARTIFICIAL (decl) = 1;
2930 init = build_string (length + 1, name);
2931 TREE_TYPE (init) = type;
2932 DECL_INITIAL (decl) = init;
2934 TREE_USED (decl) = 1;
2936 finish_decl (decl, init, NULL_TREE);
2941 /* Return a definition for a builtin function named NAME and whose data type
2942 is TYPE. TYPE should be a function type with argument types.
2943 FUNCTION_CODE tells later passes how to compile calls to this function.
2944 See tree.h for its possible values.
2946 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2947 the name to be called if we can't opencode the function. If
2948 ATTRS is nonzero, use that for the function's attribute list. */
2951 builtin_function (name, type, function_code, class, library_name, attrs)
2955 enum built_in_class class;
2956 const char *library_name;
2959 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2960 DECL_EXTERNAL (decl) = 1;
2961 TREE_PUBLIC (decl) = 1;
2963 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2964 make_decl_rtl (decl, NULL);
2966 DECL_BUILT_IN_CLASS (decl) = class;
2967 DECL_FUNCTION_CODE (decl) = function_code;
2969 /* Warn if a function in the namespace for users
2970 is used without an occasion to consider it declared. */
2971 if (name[0] != '_' || name[1] != '_')
2972 C_DECL_ANTICIPATED (decl) = 1;
2974 /* Possibly apply some default attributes to this built-in function. */
2976 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2978 decl_attributes (&decl, NULL_TREE, 0);
2983 /* Apply default attributes to a function, if a system function with default
2987 c_insert_default_attributes (decl)
2990 if (!TREE_PUBLIC (decl))
2992 c_common_insert_default_attributes (decl);
2995 /* Called when a declaration is seen that contains no names to declare.
2996 If its type is a reference to a structure, union or enum inherited
2997 from a containing scope, shadow that tag name for the current scope
2998 with a forward reference.
2999 If its type defines a new named structure or union
3000 or defines an enum, it is valid but we need not do anything here.
3001 Otherwise, it is an error. */
3004 shadow_tag (declspecs)
3007 shadow_tag_warned (declspecs, 0);
3011 shadow_tag_warned (declspecs, warned)
3014 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3021 pending_invalid_xref = 0;
3023 /* Remove the attributes from declspecs, since they will confuse the
3025 split_specs_attrs (declspecs, &specs, &attrs);
3027 for (link = specs; link; link = TREE_CHAIN (link))
3029 tree value = TREE_VALUE (link);
3030 enum tree_code code = TREE_CODE (value);
3032 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3033 /* Used to test also that TYPE_SIZE (value) != 0.
3034 That caused warning for `struct foo;' at top level in the file. */
3036 tree name = lookup_tag_reverse (value);
3043 if (warned != 1 && code != ENUMERAL_TYPE)
3044 /* Empty unnamed enum OK */
3046 pedwarn ("unnamed struct/union that defines no instances");
3052 t = lookup_tag (code, name, current_binding_level, 1);
3056 t = make_node (code);
3063 if (!warned && ! in_system_header)
3065 warning ("useless keyword or type name in empty declaration");
3072 error ("two types specified in one empty declaration");
3077 pedwarn ("empty declaration");
3081 /* Construct an array declarator. EXPR is the expression inside [], or
3082 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3083 to the pointer to which a parameter array is converted). STATIC_P is
3084 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3085 is non-zero is the array is [*], a VLA of unspecified length which is
3086 nevertheless a complete type (not currently implemented by GCC),
3087 zero otherwise. The declarator is constructed as an ARRAY_REF
3088 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3089 left of the [] (filled by in set_array_declarator_type) and operand 1
3090 is the expression inside; whose TREE_TYPE is the type qualifiers and
3091 which has TREE_STATIC set if "static" is used. */
3094 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3101 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3102 TREE_TYPE (decl) = quals;
3103 TREE_STATIC (decl) = (static_p ? 1 : 0);
3104 if (pedantic && !flag_isoc99)
3106 if (static_p || quals != NULL_TREE)
3107 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
3109 pedwarn ("ISO C90 does not support `[*]' array declarators");
3112 warning ("GCC does not yet properly implement `[*]' array declarators");
3116 /* Set the type of an array declarator. DECL is the declarator, as
3117 constructed by build_array_declarator; TYPE is what appears on the left
3118 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3119 abstract declarator, zero otherwise; this is used to reject static and
3120 type qualifiers in abstract declarators, where they are not in the
3124 set_array_declarator_type (decl, type, abstract_p)
3129 TREE_OPERAND (decl, 0) = type;
3130 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3131 error ("static or type qualifiers in abstract declarator");
3135 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3138 groktypename (typename)
3143 if (TREE_CODE (typename) != TREE_LIST)
3146 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3148 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
3150 /* Apply attributes. */
3151 decl_attributes (&typename, attrs, 0);
3156 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3159 groktypename_in_parm_context (typename)
3162 if (TREE_CODE (typename) != TREE_LIST)
3164 return grokdeclarator (TREE_VALUE (typename),
3165 TREE_PURPOSE (typename),
3169 /* Decode a declarator in an ordinary declaration or data definition.
3170 This is called as soon as the type information and variable name
3171 have been parsed, before parsing the initializer if any.
3172 Here we create the ..._DECL node, fill in its type,
3173 and put it on the list of decls for the current context.
3174 The ..._DECL node is returned as the value.
3176 Exception: for arrays where the length is not specified,
3177 the type is left null, to be filled in by `finish_decl'.
3179 Function definitions do not come here; they go to start_function
3180 instead. However, external and forward declarations of functions
3181 do go through here. Structure field declarations are done by
3182 grokfield and not through here. */
3185 start_decl (declarator, declspecs, initialized, attributes)
3186 tree declarator, declspecs;
3193 /* An object declared as __attribute__((deprecated)) suppresses
3194 warnings of uses of other deprecated items. */
3195 if (lookup_attribute ("deprecated", attributes))
3196 deprecated_state = DEPRECATED_SUPPRESS;
3198 decl = grokdeclarator (declarator, declspecs,
3199 NORMAL, initialized);
3201 deprecated_state = DEPRECATED_NORMAL;
3203 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3204 && MAIN_NAME_P (DECL_NAME (decl)))
3205 warning_with_decl (decl, "`%s' is usually a function");
3208 /* Is it valid for this decl to have an initializer at all?
3209 If not, set INITIALIZED to zero, which will indirectly
3210 tell `finish_decl' to ignore the initializer once it is parsed. */
3211 switch (TREE_CODE (decl))
3214 /* typedef foo = bar means give foo the same type as bar.
3215 We haven't parsed bar yet, so `finish_decl' will fix that up.
3216 Any other case of an initialization in a TYPE_DECL is an error. */
3217 if (pedantic || list_length (declspecs) > 1)
3219 error ("typedef `%s' is initialized",
3220 IDENTIFIER_POINTER (DECL_NAME (decl)));
3226 error ("function `%s' is initialized like a variable",
3227 IDENTIFIER_POINTER (DECL_NAME (decl)));
3232 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3233 error ("parameter `%s' is initialized",
3234 IDENTIFIER_POINTER (DECL_NAME (decl)));
3239 /* Don't allow initializations for incomplete types
3240 except for arrays which might be completed by the initialization. */
3242 /* This can happen if the array size is an undefined macro. We already
3243 gave a warning, so we don't need another one. */
3244 if (TREE_TYPE (decl) == error_mark_node)
3246 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3248 /* A complete type is ok if size is fixed. */
3250 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3251 || C_DECL_VARIABLE_SIZE (decl))
3253 error ("variable-sized object may not be initialized");
3257 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3259 error ("variable `%s' has initializer but incomplete type",
3260 IDENTIFIER_POINTER (DECL_NAME (decl)));
3263 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3265 error ("elements of array `%s' have incomplete type",
3266 IDENTIFIER_POINTER (DECL_NAME (decl)));
3274 /* Seems redundant with grokdeclarator. */
3275 if (current_binding_level != global_binding_level
3276 && DECL_EXTERNAL (decl)
3277 && TREE_CODE (decl) != FUNCTION_DECL)
3278 warning ("declaration of `%s' has `extern' and is initialized",
3279 IDENTIFIER_POINTER (DECL_NAME (decl)));
3281 DECL_EXTERNAL (decl) = 0;
3282 if (current_binding_level == global_binding_level)
3283 TREE_STATIC (decl) = 1;
3285 /* Tell `pushdecl' this is an initialized decl
3286 even though we don't yet have the initializer expression.
3287 Also tell `finish_decl' it may store the real initializer. */
3288 DECL_INITIAL (decl) = error_mark_node;
3291 /* If this is a function declaration, write a record describing it to the
3292 prototypes file (if requested). */
3294 if (TREE_CODE (decl) == FUNCTION_DECL)
3295 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3297 /* ANSI specifies that a tentative definition which is not merged with
3298 a non-tentative definition behaves exactly like a definition with an
3299 initializer equal to zero. (Section 3.7.2)
3301 -fno-common gives strict ANSI behavior, though this tends to break
3302 a large body of code that grew up without this rule.
3304 Thread-local variables are never common, since there's no entrenched
3305 body of code to break, and it allows more efficient variable references
3306 in the presense of dynamic linking. */
3308 if (TREE_CODE (decl) == VAR_DECL
3310 && TREE_PUBLIC (decl)
3311 && !DECL_THREAD_LOCAL (decl)
3313 DECL_COMMON (decl) = 1;
3315 /* Set attributes here so if duplicate decl, will have proper attributes. */
3316 decl_attributes (&decl, attributes, 0);
3318 /* If #pragma weak was used, mark the decl weak now. */
3319 if (current_binding_level == global_binding_level)
3320 maybe_apply_pragma_weak (decl);
3322 if (TREE_CODE (decl) == FUNCTION_DECL
3323 && DECL_DECLARED_INLINE_P (decl)
3324 && DECL_UNINLINABLE (decl)
3325 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3326 warning_with_decl (decl,
3327 "inline function `%s' given attribute noinline");
3329 /* Add this decl to the current binding level.
3330 TEM may equal DECL or it may be a previous decl of the same name. */
3331 tem = pushdecl (decl);
3333 /* For a local variable, define the RTL now. */
3334 if (current_binding_level != global_binding_level
3335 /* But not if this is a duplicate decl
3336 and we preserved the rtl from the previous one
3337 (which may or may not happen). */
3338 && !DECL_RTL_SET_P (tem)
3339 && !DECL_CONTEXT (tem))
3341 if (TREE_TYPE (tem) != error_mark_node
3342 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3344 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3345 && DECL_INITIAL (tem) != 0)
3352 /* Finish processing of a declaration;
3353 install its initial value.
3354 If the length of an array type is not known before,
3355 it must be determined now, from the initial value, or it is an error. */
3358 finish_decl (decl, init, asmspec_tree)
3362 tree type = TREE_TYPE (decl);
3363 int was_incomplete = (DECL_SIZE (decl) == 0);
3364 const char *asmspec = 0;
3366 /* If a name was specified, get the string. */
3367 if (current_binding_level == global_binding_level)
3368 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3370 asmspec = TREE_STRING_POINTER (asmspec_tree);
3372 /* If `start_decl' didn't like having an initialization, ignore it now. */
3373 if (init != 0 && DECL_INITIAL (decl) == 0)
3376 /* Don't crash if parm is initialized. */
3377 if (TREE_CODE (decl) == PARM_DECL)
3382 if (TREE_CODE (decl) != TYPE_DECL)
3383 store_init_value (decl, init);
3386 /* typedef foo = bar; store the type of bar as the type of foo. */
3387 TREE_TYPE (decl) = TREE_TYPE (init);
3388 DECL_INITIAL (decl) = init = 0;
3392 /* Deduce size of array from initialization, if not already known */
3393 if (TREE_CODE (type) == ARRAY_TYPE
3394 && TYPE_DOMAIN (type) == 0
3395 && TREE_CODE (decl) != TYPE_DECL)
3398 = (TREE_STATIC (decl)
3399 /* Even if pedantic, an external linkage array
3400 may have incomplete type at first. */
3401 ? pedantic && !TREE_PUBLIC (decl)
3402 : !DECL_EXTERNAL (decl));
3404 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3406 /* Get the completed type made by complete_array_type. */
3407 type = TREE_TYPE (decl);
3410 error_with_decl (decl, "initializer fails to determine size of `%s'");
3412 else if (failure == 2)
3415 error_with_decl (decl, "array size missing in `%s'");
3416 /* If a `static' var's size isn't known,
3417 make it extern as well as static, so it does not get
3419 If it is not `static', then do not mark extern;
3420 finish_incomplete_decl will give it a default size
3421 and it will get allocated. */
3422 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3423 DECL_EXTERNAL (decl) = 1;
3426 /* TYPE_MAX_VALUE is always one less than the number of elements
3427 in the array, because we start counting at zero. Therefore,
3428 warn only if the value is less than zero. */
3429 else if (pedantic && TYPE_DOMAIN (type) != 0
3430 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3431 error_with_decl (decl, "zero or negative size array `%s'");
3433 layout_decl (decl, 0);
3436 if (TREE_CODE (decl) == VAR_DECL)
3438 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3439 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3440 layout_decl (decl, 0);
3442 if (DECL_SIZE (decl) == 0
3443 /* Don't give an error if we already gave one earlier. */
3444 && TREE_TYPE (decl) != error_mark_node
3445 && (TREE_STATIC (decl)
3447 /* A static variable with an incomplete type
3448 is an error if it is initialized.
3449 Also if it is not file scope.
3450 Otherwise, let it through, but if it is not `extern'
3451 then it may cause an error message later. */
3452 (DECL_INITIAL (decl) != 0
3453 || DECL_CONTEXT (decl) != 0)
3455 /* An automatic variable with an incomplete type
3457 !DECL_EXTERNAL (decl)))
3459 error_with_decl (decl, "storage size of `%s' isn't known");
3460 TREE_TYPE (decl) = error_mark_node;
3463 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3464 && DECL_SIZE (decl) != 0)
3466 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3467 constant_expression_warning (DECL_SIZE (decl));
3469 error_with_decl (decl, "storage size of `%s' isn't constant");
3472 if (TREE_USED (type))
3473 TREE_USED (decl) = 1;
3476 /* If this is a function and an assembler name is specified, it isn't
3477 builtin any more. Also reset DECL_RTL so we can give it its new
3479 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3481 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3482 SET_DECL_RTL (decl, NULL_RTX);
3483 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3486 /* Output the assembler code and/or RTL code for variables and functions,
3487 unless the type is an undefined structure or union.
3488 If not, it will get done when the type is completed. */
3490 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3492 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3493 maybe_objc_check_decl (decl);
3495 if (!DECL_CONTEXT (decl))
3497 if (DECL_INITIAL (decl) == NULL_TREE
3498 || DECL_INITIAL (decl) == error_mark_node)
3499 /* Don't output anything
3500 when a tentative file-scope definition is seen.
3501 But at end of compilation, do output code for them. */
3502 DECL_DEFER_OUTPUT (decl) = 1;
3503 rest_of_decl_compilation (decl, asmspec,
3504 (DECL_CONTEXT (decl) == 0
3505 || TREE_ASM_WRITTEN (decl)), 0);
3509 /* This is a local variable. If there is an ASMSPEC, the
3510 user has requested that we handle it specially. */
3513 /* In conjunction with an ASMSPEC, the `register'
3514 keyword indicates that we should place the variable
3515 in a particular register. */
3516 if (DECL_REGISTER (decl))
3517 DECL_C_HARD_REGISTER (decl) = 1;
3519 /* If this is not a static variable, issue a warning.
3520 It doesn't make any sense to give an ASMSPEC for an
3521 ordinary, non-register local variable. Historically,
3522 GCC has accepted -- but ignored -- the ASMSPEC in
3524 if (TREE_CODE (decl) == VAR_DECL
3525 && !DECL_REGISTER (decl)
3526 && !TREE_STATIC (decl))
3527 warning_with_decl (decl,
3528 "ignoring asm-specifier for non-static local variable `%s'");
3530 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3533 if (TREE_CODE (decl) != FUNCTION_DECL)
3534 add_decl_stmt (decl);
3537 if (DECL_CONTEXT (decl) != 0)
3539 /* Recompute the RTL of a local array now
3540 if it used to be an incomplete type. */
3542 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3544 /* If we used it already as memory, it must stay in memory. */
3545 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3546 /* If it's still incomplete now, no init will save it. */
3547 if (DECL_SIZE (decl) == 0)
3548 DECL_INITIAL (decl) = 0;
3553 if (TREE_CODE (decl) == TYPE_DECL)
3555 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3556 maybe_objc_check_decl (decl);
3557 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3560 /* At the end of a declaration, throw away any variable type sizes
3561 of types defined inside that declaration. There is no use
3562 computing them in the following function definition. */
3563 if (current_binding_level == global_binding_level)
3564 get_pending_sizes ();
3567 /* Given a parsed parameter declaration,
3568 decode it into a PARM_DECL and push that on the current binding level.
3569 Also, for the sake of forward parm decls,
3570 record the given order of parms in `parm_order'. */
3573 push_parm_decl (parm)
3577 int old_immediate_size_expand = immediate_size_expand;
3578 /* Don't try computing parm sizes now -- wait till fn is called. */
3579 immediate_size_expand = 0;
3581 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3582 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3583 decl_attributes (&decl, TREE_VALUE (parm), 0);
3586 if (DECL_NAME (decl))
3589 olddecl = lookup_name (DECL_NAME (decl));
3590 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3591 pedwarn_with_decl (decl,
3592 "ISO C forbids parameter `%s' shadowing typedef");
3596 decl = pushdecl (decl);
3598 immediate_size_expand = old_immediate_size_expand;
3600 current_binding_level->parm_order
3601 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3603 /* Add this decl to the current binding level. */
3604 finish_decl (decl, NULL_TREE, NULL_TREE);
3607 /* Clear the given order of parms in `parm_order'.
3608 Used at start of parm list,
3609 and also at semicolon terminating forward decls. */
3614 current_binding_level->parm_order = NULL_TREE;
3617 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3618 literal, which may be an incomplete array type completed by the
3619 initializer; INIT is a CONSTRUCTOR that initializes the compound
3623 build_compound_literal (type, init)
3627 /* We do not use start_decl here because we have a type, not a declarator;
3628 and do not use finish_decl because the decl should be stored inside
3629 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3630 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3633 DECL_EXTERNAL (decl) = 0;
3634 TREE_PUBLIC (decl) = 0;
3635 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3636 DECL_CONTEXT (decl) = current_function_decl;
3637 TREE_USED (decl) = 1;
3638 TREE_TYPE (decl) = type;
3639 TREE_READONLY (decl) = TREE_READONLY (type);
3640 store_init_value (decl, init);
3642 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3644 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3649 type = TREE_TYPE (decl);
3650 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3651 return error_mark_node;
3653 stmt = build_stmt (DECL_STMT, decl);
3654 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3655 TREE_SIDE_EFFECTS (complit) = 1;
3657 layout_decl (decl, 0);
3659 if (TREE_STATIC (decl))
3661 /* This decl needs a name for the assembler output. We also need
3662 a unique suffix to be added to the name. */
3664 extern int var_labelno;
3666 ASM_FORMAT_PRIVATE_NAME (name, "__compound_literal", var_labelno);
3668 DECL_NAME (decl) = get_identifier (name);
3669 DECL_DEFER_OUTPUT (decl) = 1;
3670 DECL_COMDAT (decl) = 1;
3671 DECL_ARTIFICIAL (decl) = 1;
3673 rest_of_decl_compilation (decl, NULL, 1, 0);
3679 /* Make TYPE a complete type based on INITIAL_VALUE.
3680 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3681 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3684 complete_array_type (type, initial_value, do_default)
3689 tree maxindex = NULL_TREE;
3694 /* Note MAXINDEX is really the maximum index,
3695 one less than the size. */
3696 if (TREE_CODE (initial_value) == STRING_CST)
3699 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3700 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3703 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3705 tree elts = CONSTRUCTOR_ELTS (initial_value);
3706 maxindex = build_int_2 (-1, -1);
3707 for (; elts; elts = TREE_CHAIN (elts))
3709 if (TREE_PURPOSE (elts))
3710 maxindex = TREE_PURPOSE (elts);
3712 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3713 maxindex, integer_one_node));
3715 maxindex = copy_node (maxindex);
3719 /* Make an error message unless that happened already. */
3720 if (initial_value != error_mark_node)
3723 /* Prevent further error messages. */
3724 maxindex = build_int_2 (0, 0);
3731 maxindex = build_int_2 (0, 0);
3737 TYPE_DOMAIN (type) = build_index_type (maxindex);
3738 if (!TREE_TYPE (maxindex))
3739 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3742 /* Lay out the type now that we can get the real answer. */
3749 /* Given declspecs and a declarator,
3750 determine the name and type of the object declared
3751 and construct a ..._DECL node for it.
3752 (In one case we can return a ..._TYPE node instead.
3753 For invalid input we sometimes return 0.)
3755 DECLSPECS is a chain of tree_list nodes whose value fields
3756 are the storage classes and type specifiers.
3758 DECL_CONTEXT says which syntactic context this declaration is in:
3759 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3760 FUNCDEF for a function definition. Like NORMAL but a few different
3761 error messages in each case. Return value may be zero meaning
3762 this definition is too screwy to try to parse.
3763 PARM for a parameter declaration (either within a function prototype
3764 or before a function body). Make a PARM_DECL, or return void_type_node.
3765 TYPENAME if for a typename (in a cast or sizeof).
3766 Don't make a DECL node; just return the ..._TYPE node.
3767 FIELD for a struct or union field; make a FIELD_DECL.
3768 BITFIELD for a field with specified width.
3769 INITIALIZED is 1 if the decl has an initializer.
3771 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3772 It may also be so in the PARM case, for a prototype where the
3773 argument type is specified but not the name.
3775 This function is where the complicated C meanings of `static'
3776 and `extern' are interpreted. */
3779 grokdeclarator (declarator, declspecs, decl_context, initialized)
3782 enum decl_context decl_context;
3787 tree type = NULL_TREE;
3792 int type_quals = TYPE_UNQUALIFIED;
3794 int explicit_int = 0;
3795 int explicit_char = 0;
3796 int defaulted_int = 0;
3797 tree typedef_decl = 0;
3799 tree typedef_type = 0;
3800 int funcdef_flag = 0;
3801 enum tree_code innermost_code = ERROR_MARK;
3803 int size_varies = 0;
3804 tree decl_attr = NULL_TREE;
3805 tree array_ptr_quals = NULL_TREE;
3806 int array_parm_static = 0;
3807 tree returned_attrs = NULL_TREE;
3809 if (decl_context == BITFIELD)
3810 bitfield = 1, decl_context = FIELD;
3812 if (decl_context == FUNCDEF)
3813 funcdef_flag = 1, decl_context = NORMAL;
3815 /* Look inside a declarator for the name being declared
3816 and get it as a string, for an error message. */
3818 tree decl = declarator;
3822 switch (TREE_CODE (decl))
3827 innermost_code = TREE_CODE (decl);
3828 decl = TREE_OPERAND (decl, 0);
3832 decl = TREE_VALUE (decl);
3835 case IDENTIFIER_NODE:
3836 name = IDENTIFIER_POINTER (decl);
3847 /* A function definition's declarator must have the form of
3848 a function declarator. */
3850 if (funcdef_flag && innermost_code != CALL_EXPR)
3853 /* Anything declared one level down from the top level
3854 must be one of the parameters of a function
3855 (because the body is at least two levels down). */
3857 /* If this looks like a function definition, make it one,
3858 even if it occurs where parms are expected.
3859 Then store_parm_decls will reject it and not use it as a parm. */
3860 if (decl_context == NORMAL && !funcdef_flag
3861 && current_binding_level->parm_flag)
3862 decl_context = PARM;
3864 /* Look through the decl specs and record which ones appear.
3865 Some typespecs are defined as built-in typenames.
3866 Others, the ones that are modifiers of other types,
3867 are represented by bits in SPECBITS: set the bits for
3868 the modifiers that appear. Storage class keywords are also in SPECBITS.
3870 If there is a typedef name or a type, store the type in TYPE.
3871 This includes builtin typedefs such as `int'.
3873 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3874 and did not come from a user typedef.
3876 Set LONGLONG if `long' is mentioned twice. */
3878 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3880 tree id = TREE_VALUE (spec);
3882 /* If the entire declaration is itself tagged as deprecated then
3883 suppress reports of deprecated items. */
3884 if (id && TREE_DEPRECATED (id))
3886 if (deprecated_state != DEPRECATED_SUPPRESS)
3887 warn_deprecated_use (id);
3890 if (id == ridpointers[(int) RID_INT])
3892 if (id == ridpointers[(int) RID_CHAR])
3895 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3897 enum rid i = C_RID_CODE (id);
3898 if ((int) i <= (int) RID_LAST_MODIFIER)
3900 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3903 error ("`long long long' is too long for GCC");
3906 if (pedantic && !flag_isoc99 && ! in_system_header
3908 pedwarn ("ISO C90 does not support `long long'");
3912 else if (specbits & (1 << (int) i))
3913 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3915 /* Diagnose "__thread extern". Recall that this list
3916 is in the reverse order seen in the text. */
3918 && (specbits & (1 << (int) RID_EXTERN
3919 | 1 << (int) RID_STATIC)))
3921 if (specbits & 1 << (int) RID_EXTERN)
3922 error ("`__thread' before `extern'");
3924 error ("`__thread' before `static'");
3927 specbits |= 1 << (int) i;
3932 error ("two or more data types in declaration of `%s'", name);
3933 /* Actual typedefs come to us as TYPE_DECL nodes. */
3934 else if (TREE_CODE (id) == TYPE_DECL)
3936 if (TREE_TYPE (id) == error_mark_node)
3937 ; /* Allow the type to default to int to avoid cascading errors. */
3940 type = TREE_TYPE (id);
3941 decl_attr = DECL_ATTRIBUTES (id);
3945 /* Built-in types come as identifiers. */
3946 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3948 tree t = lookup_name (id);
3949 if (TREE_TYPE (t) == error_mark_node)
3951 else if (!t || TREE_CODE (t) != TYPE_DECL)
3952 error ("`%s' fails to be a typedef or built in type",
3953 IDENTIFIER_POINTER (id));
3956 type = TREE_TYPE (t);
3960 else if (TREE_CODE (id) != ERROR_MARK)
3967 typedef_type = type;
3969 size_varies = C_TYPE_VARIABLE_SIZE (type);
3971 /* No type at all: default to `int', and set DEFAULTED_INT
3972 because it was not a user-defined typedef. */
3976 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3977 | (1 << (int) RID_SIGNED)
3978 | (1 << (int) RID_UNSIGNED)
3979 | (1 << (int) RID_COMPLEX))))
3980 /* Don't warn about typedef foo = bar. */
3981 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3982 && ! in_system_header)
3984 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3985 and this is a function, or if -Wimplicit; prefer the former
3986 warning since it is more explicit. */
3987 if ((warn_implicit_int || warn_return_type || flag_isoc99)
3989 warn_about_return_type = 1;
3990 else if (warn_implicit_int || flag_isoc99)
3991 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3996 type = integer_type_node;
3999 /* Now process the modifiers that were specified
4000 and check for invalid combinations. */
4002 /* Long double is a special combination. */
4004 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4005 && TYPE_MAIN_VARIANT (type) == double_type_node)
4007 specbits &= ~(1 << (int) RID_LONG);
4008 type = long_double_type_node;
4011 /* Check all other uses of type modifiers. */
4013 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4014 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4018 if ((specbits & 1 << (int) RID_LONG)
4019 && (specbits & 1 << (int) RID_SHORT))
4020 error ("both long and short specified for `%s'", name);
4021 else if (((specbits & 1 << (int) RID_LONG)
4022 || (specbits & 1 << (int) RID_SHORT))
4024 error ("long or short specified with char for `%s'", name);
4025 else if (((specbits & 1 << (int) RID_LONG)
4026 || (specbits & 1 << (int) RID_SHORT))
4027 && TREE_CODE (type) == REAL_TYPE)
4029 static int already = 0;
4031 error ("long or short specified with floating type for `%s'", name);
4032 if (! already && ! pedantic)
4034 error ("the only valid combination is `long double'");
4038 else if ((specbits & 1 << (int) RID_SIGNED)
4039 && (specbits & 1 << (int) RID_UNSIGNED))
4040 error ("both signed and unsigned specified for `%s'", name);
4041 else if (TREE_CODE (type) != INTEGER_TYPE)
4042 error ("long, short, signed or unsigned invalid for `%s'", name);
4046 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4048 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4050 if (flag_pedantic_errors)
4055 /* Discard the type modifiers if they are invalid. */
4058 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4059 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4064 if ((specbits & (1 << (int) RID_COMPLEX))
4065 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4067 error ("complex invalid for `%s'", name);
4068 specbits &= ~(1 << (int) RID_COMPLEX);
4071 /* Decide whether an integer type is signed or not.
4072 Optionally treat bitfields as signed by default. */
4073 if (specbits & 1 << (int) RID_UNSIGNED
4074 || (bitfield && ! flag_signed_bitfields
4075 && (explicit_int || defaulted_int || explicit_char
4076 /* A typedef for plain `int' without `signed'
4077 can be controlled just like plain `int'. */
4078 || ! (typedef_decl != 0
4079 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4080 && TREE_CODE (type) != ENUMERAL_TYPE
4081 && !(specbits & 1 << (int) RID_SIGNED)))
4084 type = long_long_unsigned_type_node;
4085 else if (specbits & 1 << (int) RID_LONG)
4086 type = long_unsigned_type_node;
4087 else if (specbits & 1 << (int) RID_SHORT)
4088 type = short_unsigned_type_node;
4089 else if (type == char_type_node)
4090 type = unsigned_char_type_node;
4091 else if (typedef_decl)
4092 type = c_common_unsigned_type (type);
4094 type = unsigned_type_node;
4096 else if ((specbits & 1 << (int) RID_SIGNED)
4097 && type == char_type_node)
4098 type = signed_char_type_node;
4100 type = long_long_integer_type_node;
4101 else if (specbits & 1 << (int) RID_LONG)
4102 type = long_integer_type_node;
4103 else if (specbits & 1 << (int) RID_SHORT)
4104 type = short_integer_type_node;
4106 if (specbits & 1 << (int) RID_COMPLEX)
4108 if (pedantic && !flag_isoc99)
4109 pedwarn ("ISO C90 does not support complex types");
4110 /* If we just have "complex", it is equivalent to
4111 "complex double", but if any modifiers at all are specified it is
4112 the complex form of TYPE. E.g, "complex short" is
4113 "complex short int". */
4115 if (defaulted_int && ! longlong
4116 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4117 | (1 << (int) RID_SIGNED)
4118 | (1 << (int) RID_UNSIGNED))))
4121 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4122 type = complex_double_type_node;
4124 else if (type == integer_type_node)
4127 pedwarn ("ISO C does not support complex integer types");
4128 type = complex_integer_type_node;
4130 else if (type == float_type_node)
4131 type = complex_float_type_node;
4132 else if (type == double_type_node)
4133 type = complex_double_type_node;
4134 else if (type == long_double_type_node)
4135 type = complex_long_double_type_node;
4139 pedwarn ("ISO C does not support complex integer types");
4140 type = build_complex_type (type);
4144 /* Figure out the type qualifiers for the declaration. There are
4145 two ways a declaration can become qualified. One is something
4146 like `const int i' where the `const' is explicit. Another is
4147 something like `typedef const int CI; CI i' where the type of the
4148 declaration contains the `const'. */
4149 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4150 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4151 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4152 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4153 if (constp > 1 && ! flag_isoc99)
4154 pedwarn ("duplicate `const'");
4155 if (restrictp > 1 && ! flag_isoc99)
4156 pedwarn ("duplicate `restrict'");
4157 if (volatilep > 1 && ! flag_isoc99)
4158 pedwarn ("duplicate `volatile'");
4159 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4160 type = TYPE_MAIN_VARIANT (type);
4161 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4162 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4163 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4165 /* Warn if two storage classes are given. Default to `auto'. */
4170 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4171 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4172 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4173 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4174 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4176 /* "static __thread" and "extern __thread" are allowed. */
4177 if ((specbits & (1 << (int) RID_THREAD
4178 | 1 << (int) RID_STATIC
4179 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
4182 /* Warn about storage classes that are invalid for certain
4183 kinds of declarations (parameters, typenames, etc.). */
4186 error ("multiple storage classes in declaration of `%s'", name);
4187 else if (funcdef_flag
4189 & ((1 << (int) RID_REGISTER)
4190 | (1 << (int) RID_AUTO)
4191 | (1 << (int) RID_TYPEDEF)
4192 | (1 << (int) RID_THREAD))))
4194 if (specbits & 1 << (int) RID_AUTO
4195 && (pedantic || current_binding_level == global_binding_level))
4196 pedwarn ("function definition declared `auto'");
4197 if (specbits & 1 << (int) RID_REGISTER)
4198 error ("function definition declared `register'");
4199 if (specbits & 1 << (int) RID_TYPEDEF)
4200 error ("function definition declared `typedef'");
4201 if (specbits & 1 << (int) RID_THREAD)
4202 error ("function definition declared `__thread'");
4203 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4204 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
4206 else if (decl_context != NORMAL && nclasses > 0)
4208 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4212 switch (decl_context)
4215 error ("storage class specified for structure field `%s'",
4219 error ("storage class specified for parameter `%s'", name);
4222 error ("storage class specified for typename");
4225 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4226 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4227 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
4230 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4232 /* `extern' with initialization is invalid if not at top level. */
4233 if (current_binding_level == global_binding_level)
4234 warning ("`%s' initialized and declared `extern'", name);
4236 error ("`%s' has both `extern' and initializer", name);
4238 else if (current_binding_level == global_binding_level)
4240 if (specbits & 1 << (int) RID_AUTO)
4241 error ("top-level declaration of `%s' specifies `auto'", name);
4245 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
4246 error ("nested function `%s' declared `extern'", name);
4247 else if ((specbits & (1 << (int) RID_THREAD
4248 | 1 << (int) RID_EXTERN
4249 | 1 << (int) RID_STATIC))
4250 == (1 << (int) RID_THREAD))
4252 error ("function-scope `%s' implicitly auto and declared `__thread'",
4254 specbits &= ~(1 << (int) RID_THREAD);
4259 /* Now figure out the structure of the declarator proper.
4260 Descend through it, creating more complex types, until we reach
4261 the declared identifier (or NULL_TREE, in an absolute declarator). */
4263 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4265 if (type == error_mark_node)
4267 declarator = TREE_OPERAND (declarator, 0);
4271 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4272 an INDIRECT_REF (for *...),
4273 a CALL_EXPR (for ...(...)),
4274 a TREE_LIST (for nested attributes),
4275 an identifier (for the name being declared)
4276 or a null pointer (for the place in an absolute declarator
4277 where the name was omitted).
4278 For the last two cases, we have just exited the loop.
4280 At this point, TYPE is the type of elements of an array,
4281 or for a function to return, or for a pointer to point to.
4282 After this sequence of ifs, TYPE is the type of the
4283 array or function or pointer, and DECLARATOR has had its
4284 outermost layer removed. */
4286 if (array_ptr_quals != NULL_TREE || array_parm_static)
4288 /* Only the innermost declarator (making a parameter be of
4289 array type which is converted to pointer type)
4290 may have static or type qualifiers. */
4291 error ("static or type qualifiers in non-parameter array declarator");
4292 array_ptr_quals = NULL_TREE;
4293 array_parm_static = 0;
4296 if (TREE_CODE (declarator) == TREE_LIST)
4298 /* We encode a declarator with embedded attributes using
4300 tree attrs = TREE_PURPOSE (declarator);
4303 declarator = TREE_VALUE (declarator);
4304 inner_decl = declarator;
4305 while (inner_decl != NULL_TREE
4306 && TREE_CODE (inner_decl) == TREE_LIST)
4307 inner_decl = TREE_VALUE (inner_decl);
4308 if (inner_decl == NULL_TREE
4309 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4310 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4311 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4312 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4313 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4314 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4315 returned_attrs = decl_attributes (&type,
4316 chainon (returned_attrs, attrs),
4319 else if (TREE_CODE (declarator) == ARRAY_REF)
4321 tree itype = NULL_TREE;
4322 tree size = TREE_OPERAND (declarator, 1);
4323 /* The index is a signed object `sizetype' bits wide. */
4324 tree index_type = c_common_signed_type (sizetype);
4326 array_ptr_quals = TREE_TYPE (declarator);
4327 array_parm_static = TREE_STATIC (declarator);
4329 declarator = TREE_OPERAND (declarator, 0);
4331 /* Check for some types that there cannot be arrays of. */
4333 if (VOID_TYPE_P (type))
4335 error ("declaration of `%s' as array of voids", name);
4336 type = error_mark_node;
4339 if (TREE_CODE (type) == FUNCTION_TYPE)
4341 error ("declaration of `%s' as array of functions", name);
4342 type = error_mark_node;
4345 if (size == error_mark_node)
4346 type = error_mark_node;
4348 if (type == error_mark_node)
4351 /* If size was specified, set ITYPE to a range-type for that size.
4352 Otherwise, ITYPE remains null. finish_decl may figure it out
4353 from an initial value. */
4357 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4358 STRIP_TYPE_NOPS (size);
4360 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4362 error ("size of array `%s' has non-integer type", name);
4363 size = integer_one_node;
4366 if (pedantic && integer_zerop (size))
4367 pedwarn ("ISO C forbids zero-size array `%s'", name);
4369 if (TREE_CODE (size) == INTEGER_CST)
4371 constant_expression_warning (size);
4372 if (tree_int_cst_sgn (size) < 0)
4374 error ("size of array `%s' is negative", name);
4375 size = integer_one_node;
4380 /* Make sure the array size remains visibly nonconstant
4381 even if it is (eg) a const variable with known value. */
4384 if (!flag_isoc99 && pedantic)
4386 if (TREE_CONSTANT (size))
4387 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4390 pedwarn ("ISO C90 forbids variable-size array `%s'",
4395 if (integer_zerop (size))
4397 /* A zero-length array cannot be represented with an
4398 unsigned index type, which is what we'll get with
4399 build_index_type. Create an open-ended range instead. */
4400 itype = build_range_type (sizetype, size, NULL_TREE);
4404 /* Compute the maximum valid index, that is, size - 1.
4405 Do the calculation in index_type, so that if it is
4406 a variable the computations will be done in the
4408 itype = fold (build (MINUS_EXPR, index_type,
4409 convert (index_type, size),
4410 convert (index_type, size_one_node)));
4412 /* If that overflowed, the array is too big.
4413 ??? While a size of INT_MAX+1 technically shouldn't
4414 cause an overflow (because we subtract 1), the overflow
4415 is recorded during the conversion to index_type, before
4416 the subtraction. Handling this case seems like an
4417 unnecessary complication. */
4418 if (TREE_OVERFLOW (itype))
4420 error ("size of array `%s' is too large", name);
4421 type = error_mark_node;
4426 itype = variable_size (itype);
4427 itype = build_index_type (itype);
4430 else if (decl_context == FIELD)
4432 if (pedantic && !flag_isoc99 && !in_system_header)
4433 pedwarn ("ISO C90 does not support flexible array members");
4435 /* ISO C99 Flexible array members are effectively identical
4436 to GCC's zero-length array extension. */
4437 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4440 /* If pedantic, complain about arrays of incomplete types. */
4442 if (pedantic && !COMPLETE_TYPE_P (type))
4443 pedwarn ("array type has incomplete element type");
4446 /* We shouldn't have a function type here at all!
4447 Functions aren't allowed as array elements. */
4448 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4449 && (constp || volatilep))
4450 pedwarn ("ISO C forbids const or volatile function types");
4453 /* Build the array type itself, then merge any constancy or
4454 volatility into the target type. We must do it in this order
4455 to ensure that the TYPE_MAIN_VARIANT field of the array type
4456 is set correctly. */
4458 type = build_array_type (type, itype);
4460 type = c_build_qualified_type (type, type_quals);
4463 C_TYPE_VARIABLE_SIZE (type) = 1;
4465 /* The GCC extension for zero-length arrays differs from
4466 ISO flexible array members in that sizeof yields zero. */
4467 if (size && integer_zerop (size))
4470 TYPE_SIZE (type) = bitsize_zero_node;
4471 TYPE_SIZE_UNIT (type) = size_zero_node;
4473 if (decl_context != PARM
4474 && (array_ptr_quals != NULL_TREE || array_parm_static))
4476 error ("static or type qualifiers in non-parameter array declarator");
4477 array_ptr_quals = NULL_TREE;
4478 array_parm_static = 0;
4481 else if (TREE_CODE (declarator) == CALL_EXPR)
4485 /* Declaring a function type.
4486 Make sure we have a valid type for the function to return. */
4487 if (type == error_mark_node)
4492 /* Warn about some types functions can't return. */
4494 if (TREE_CODE (type) == FUNCTION_TYPE)
4496 error ("`%s' declared as function returning a function", name);
4497 type = integer_type_node;
4499 if (TREE_CODE (type) == ARRAY_TYPE)
4501 error ("`%s' declared as function returning an array", name);
4502 type = integer_type_node;
4505 /* Construct the function type and go to the next
4506 inner layer of declarator. */
4508 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4510 /* Say it's a definition
4511 only for the CALL_EXPR
4512 closest to the identifier. */
4513 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4514 /* Type qualifiers before the return type of the function
4515 qualify the return type, not the function type. */
4518 /* Type qualifiers on a function return type are normally
4519 permitted by the standard but have no effect, so give a
4520 warning at -W. Qualifiers on a void return type have
4521 meaning as a GNU extension, and are banned on function
4522 definitions in ISO C. FIXME: strictly we shouldn't
4523 pedwarn for qualified void return types except on function
4524 definitions, but not doing so could lead to the undesirable
4525 state of a "volatile void" function return type not being
4526 warned about, and a use of the function being compiled
4527 with GNU semantics, with no diagnostics under -pedantic. */
4528 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4529 pedwarn ("ISO C forbids qualified void function return type");
4530 else if (extra_warnings
4531 && !(VOID_TYPE_P (type)
4532 && type_quals == TYPE_QUAL_VOLATILE))
4533 warning ("type qualifiers ignored on function return type");
4535 type = c_build_qualified_type (type, type_quals);
4537 type_quals = TYPE_UNQUALIFIED;
4539 type = build_function_type (type, arg_types);
4540 declarator = TREE_OPERAND (declarator, 0);
4542 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4543 the formal parameter list of this FUNCTION_TYPE to point to
4544 the FUNCTION_TYPE node itself. */
4549 for (link = last_function_parm_tags;
4551 link = TREE_CHAIN (link))
4552 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4555 else if (TREE_CODE (declarator) == INDIRECT_REF)
4557 /* Merge any constancy or volatility into the target type
4560 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4562 pedwarn ("ISO C forbids qualified function types");
4564 type = c_build_qualified_type (type, type_quals);
4565 type_quals = TYPE_UNQUALIFIED;
4568 type = build_pointer_type (type);
4570 /* Process a list of type modifier keywords
4571 (such as const or volatile) that were given inside the `*'. */
4573 if (TREE_TYPE (declarator))
4581 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4582 typemodlist = TREE_CHAIN (typemodlist))
4584 tree qualifier = TREE_VALUE (typemodlist);
4586 if (C_IS_RESERVED_WORD (qualifier))
4588 if (C_RID_CODE (qualifier) == RID_CONST)
4590 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4592 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4602 error ("invalid type modifier within pointer declarator");
4603 if (constp > 1 && ! flag_isoc99)
4604 pedwarn ("duplicate `const'");
4605 if (volatilep > 1 && ! flag_isoc99)
4606 pedwarn ("duplicate `volatile'");
4607 if (restrictp > 1 && ! flag_isoc99)
4608 pedwarn ("duplicate `restrict'");
4610 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4611 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4612 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4615 declarator = TREE_OPERAND (declarator, 0);
4622 /* Now TYPE has the actual type. */
4624 /* Did array size calculations overflow? */
4626 if (TREE_CODE (type) == ARRAY_TYPE
4627 && COMPLETE_TYPE_P (type)
4628 && TREE_OVERFLOW (TYPE_SIZE (type)))
4630 error ("size of array `%s' is too large", name);
4631 /* If we proceed with the array type as it is, we'll eventually
4632 crash in tree_low_cst(). */
4633 type = error_mark_node;
4636 /* If this is declaring a typedef name, return a TYPE_DECL. */
4638 if (specbits & (1 << (int) RID_TYPEDEF))
4641 /* Note that the grammar rejects storage classes
4642 in typenames, fields or parameters */
4643 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4645 pedwarn ("ISO C forbids qualified function types");
4647 type = c_build_qualified_type (type, type_quals);
4648 decl = build_decl (TYPE_DECL, declarator, type);
4649 if ((specbits & (1 << (int) RID_SIGNED))
4650 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4651 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4652 decl_attributes (&decl, returned_attrs, 0);
4656 /* Detect the case of an array type of unspecified size
4657 which came, as such, direct from a typedef name.
4658 We must copy the type, so that each identifier gets
4659 a distinct type, so that each identifier's size can be
4660 controlled separately by its own initializer. */
4662 if (type != 0 && typedef_type != 0
4663 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4664 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4666 type = build_array_type (TREE_TYPE (type), 0);
4668 C_TYPE_VARIABLE_SIZE (type) = 1;
4671 /* If this is a type name (such as, in a cast or sizeof),
4672 compute the type and return it now. */
4674 if (decl_context == TYPENAME)
4676 /* Note that the grammar rejects storage classes
4677 in typenames, fields or parameters */
4678 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4680 pedwarn ("ISO C forbids const or volatile function types");
4682 type = c_build_qualified_type (type, type_quals);
4683 decl_attributes (&type, returned_attrs, 0);
4687 /* Aside from typedefs and type names (handle above),
4688 `void' at top level (not within pointer)
4689 is allowed only in public variables.
4690 We don't complain about parms either, but that is because
4691 a better error message can be made later. */
4693 if (VOID_TYPE_P (type) && decl_context != PARM
4694 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4695 && ((specbits & (1 << (int) RID_EXTERN))
4696 || (current_binding_level == global_binding_level
4698 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4700 error ("variable or field `%s' declared void", name);
4701 type = integer_type_node;
4704 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4705 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4710 if (decl_context == PARM)
4712 tree type_as_written;
4715 /* A parameter declared as an array of T is really a pointer to T.
4716 One declared as a function is really a pointer to a function. */
4718 if (TREE_CODE (type) == ARRAY_TYPE)
4720 /* Transfer const-ness of array into that of type pointed to. */
4721 type = TREE_TYPE (type);
4723 type = c_build_qualified_type (type, type_quals);
4724 type = build_pointer_type (type);
4725 type_quals = TYPE_UNQUALIFIED;
4726 if (array_ptr_quals)
4728 tree new_ptr_quals, new_ptr_attrs;
4730 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4731 /* We don't yet implement attributes in this context. */
4732 if (new_ptr_attrs != NULL_TREE)
4733 warning ("attributes in parameter array declarator ignored");
4738 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4740 tree qualifier = TREE_VALUE (new_ptr_quals);
4742 if (C_IS_RESERVED_WORD (qualifier))
4744 if (C_RID_CODE (qualifier) == RID_CONST)
4746 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4748 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4758 error ("invalid type modifier within array declarator");
4760 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4761 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4762 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4766 else if (TREE_CODE (type) == FUNCTION_TYPE)
4768 if (pedantic && type_quals)
4769 pedwarn ("ISO C forbids qualified function types");
4771 type = c_build_qualified_type (type, type_quals);
4772 type = build_pointer_type (type);
4773 type_quals = TYPE_UNQUALIFIED;
4775 else if (type_quals)
4776 type = c_build_qualified_type (type, type_quals);
4778 type_as_written = type;
4780 decl = build_decl (PARM_DECL, declarator, type);
4782 C_DECL_VARIABLE_SIZE (decl) = 1;
4784 /* Compute the type actually passed in the parmlist,
4785 for the case where there is no prototype.
4786 (For example, shorts and chars are passed as ints.)
4787 When there is a prototype, this is overridden later. */
4789 if (type == error_mark_node)
4790 promoted_type = type;
4792 promoted_type = c_type_promotes_to (type);
4794 DECL_ARG_TYPE (decl) = promoted_type;
4795 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4797 else if (decl_context == FIELD)
4799 /* Structure field. It may not be a function. */
4801 if (TREE_CODE (type) == FUNCTION_TYPE)
4803 error ("field `%s' declared as a function", name);
4804 type = build_pointer_type (type);
4806 else if (TREE_CODE (type) != ERROR_MARK
4807 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4809 error ("field `%s' has incomplete type", name);
4810 type = error_mark_node;
4812 /* Move type qualifiers down to element of an array. */
4813 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4815 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4817 TYPE_DOMAIN (type));
4819 /* Leave the field const or volatile as well. */
4820 type_quals = TYPE_UNQUALIFIED;
4823 decl = build_decl (FIELD_DECL, declarator, type);
4824 DECL_NONADDRESSABLE_P (decl) = bitfield;
4827 C_DECL_VARIABLE_SIZE (decl) = 1;
4829 else if (TREE_CODE (type) == FUNCTION_TYPE)
4831 /* Every function declaration is "external"
4832 except for those which are inside a function body
4833 in which `auto' is used.
4834 That is a case not specified by ANSI C,
4835 and we use it for forward declarations for nested functions. */
4836 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4837 || current_binding_level == global_binding_level);
4839 if (specbits & (1 << (int) RID_AUTO)
4840 && (pedantic || current_binding_level == global_binding_level))
4841 pedwarn ("invalid storage class for function `%s'", name);
4842 if (specbits & (1 << (int) RID_REGISTER))
4843 error ("invalid storage class for function `%s'", name);
4844 if (specbits & (1 << (int) RID_THREAD))
4845 error ("invalid storage class for function `%s'", name);
4846 /* Function declaration not at top level.
4847 Storage classes other than `extern' are not allowed
4848 and `extern' makes no difference. */
4849 if (current_binding_level != global_binding_level
4850 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4852 pedwarn ("invalid storage class for function `%s'", name);
4854 decl = build_decl (FUNCTION_DECL, declarator, type);
4855 decl = build_decl_attribute_variant (decl, decl_attr);
4857 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4858 ggc_alloc_cleared (sizeof (struct lang_decl));
4860 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4861 pedwarn ("ISO C forbids qualified function types");
4863 /* GNU C interprets a `volatile void' return type to indicate
4864 that the function does not return. */
4865 if ((type_quals & TYPE_QUAL_VOLATILE)
4866 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4867 warning ("`noreturn' function returns non-void value");
4870 DECL_EXTERNAL (decl) = 1;
4871 /* Record absence of global scope for `static' or `auto'. */
4873 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4876 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4878 /* Record presence of `inline', if it is reasonable. */
4879 if (MAIN_NAME_P (declarator))
4882 warning ("cannot inline function `main'");
4886 /* Assume that otherwise the function can be inlined. */
4887 DECL_DECLARED_INLINE_P (decl) = 1;
4889 /* Do not mark bare declarations as DECL_INLINE. Doing so
4890 in the presence of multiple declarations can result in
4891 the abstract origin pointing between the declarations,
4892 which will confuse dwarf2out. */
4895 DECL_INLINE (decl) = 1;
4896 if (specbits & (1 << (int) RID_EXTERN))
4897 current_extern_inline = 1;
4900 /* If -finline-functions, assume it can be inlined. This does
4901 two things: let the function be deferred until it is actually
4902 needed, and let dwarf2 know that the function is inlinable. */
4903 else if (flag_inline_trees == 2 && initialized)
4905 DECL_INLINE (decl) = 1;
4906 DECL_DECLARED_INLINE_P (decl) = 0;
4911 /* It's a variable. */
4912 /* An uninitialized decl with `extern' is a reference. */
4913 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4915 /* Move type qualifiers down to element of an array. */
4916 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4918 int saved_align = TYPE_ALIGN(type);
4919 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4921 TYPE_DOMAIN (type));
4922 TYPE_ALIGN (type) = saved_align;
4923 #if 0 /* Leave the variable const or volatile as well. */
4924 type_quals = TYPE_UNQUALIFIED;
4927 else if (type_quals)
4928 type = c_build_qualified_type (type, type_quals);
4930 decl = build_decl (VAR_DECL, declarator, type);
4932 C_DECL_VARIABLE_SIZE (decl) = 1;
4935 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4937 DECL_EXTERNAL (decl) = extern_ref;
4939 /* At top level, the presence of a `static' or `register' storage
4940 class specifier, or the absence of all storage class specifiers
4941 makes this declaration a definition (perhaps tentative). Also,
4942 the absence of both `static' and `register' makes it public. */
4943 if (current_binding_level == global_binding_level)
4945 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4946 | (1 << (int) RID_REGISTER)));
4947 TREE_STATIC (decl) = !extern_ref;
4949 /* Not at top level, only `static' makes a static definition. */
4952 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4953 TREE_PUBLIC (decl) = extern_ref;
4956 if (specbits & 1 << (int) RID_THREAD)
4958 if (targetm.have_tls)
4959 DECL_THREAD_LOCAL (decl) = 1;
4961 /* A mere warning is sure to result in improper semantics
4962 at runtime. Don't bother to allow this to compile. */
4963 error ("thread-local storage not supported for this target");
4967 /* Record `register' declaration for warnings on &
4968 and in case doing stupid register allocation. */
4970 if (specbits & (1 << (int) RID_REGISTER))
4971 DECL_REGISTER (decl) = 1;
4973 /* Record constancy and volatility. */
4974 c_apply_type_quals_to_decl (type_quals, decl);
4976 /* If a type has volatile components, it should be stored in memory.
4977 Otherwise, the fact that those components are volatile
4978 will be ignored, and would even crash the compiler. */
4979 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4980 c_mark_addressable (decl);
4982 decl_attributes (&decl, returned_attrs, 0);
4988 /* Decode the parameter-list info for a function type or function definition.
4989 The argument is the value returned by `get_parm_info' (or made in parse.y
4990 if there is an identifier list instead of a parameter decl list).
4991 These two functions are separate because when a function returns
4992 or receives functions then each is called multiple times but the order
4993 of calls is different. The last call to `grokparms' is always the one
4994 that contains the formal parameter names of a function definition.
4996 Store in `last_function_parms' a chain of the decls of parms.
4997 Also store in `last_function_parm_tags' a chain of the struct, union,
4998 and enum tags declared among the parms.
5000 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5002 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5003 a mere declaration. A nonempty identifier-list gets an error message
5004 when FUNCDEF_FLAG is zero. */
5007 grokparms (parms_info, funcdef_flag)
5011 tree first_parm = TREE_CHAIN (parms_info);
5013 last_function_parms = TREE_PURPOSE (parms_info);
5014 last_function_parm_tags = TREE_VALUE (parms_info);
5016 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5017 && !in_system_header)
5018 warning ("function declaration isn't a prototype");
5021 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5024 pedwarn ("parameter names (without types) in function declaration");
5026 last_function_parms = first_parm;
5033 /* We no longer test FUNCDEF_FLAG.
5034 If the arg types are incomplete in a declaration,
5035 they must include undefined tags.
5036 These tags can never be defined in the scope of the declaration,
5037 so the types can never be completed,
5038 and no call can be compiled successfully. */
5040 /* In a fcn definition, arg types must be complete. */
5043 for (parm = last_function_parms, typelt = first_parm;
5045 parm = TREE_CHAIN (parm))
5046 /* Skip over any enumeration constants declared here. */
5047 if (TREE_CODE (parm) == PARM_DECL)
5049 /* Barf if the parameter itself has an incomplete type. */
5050 tree type = TREE_VALUE (typelt);
5051 if (type == error_mark_node)
5053 if (!COMPLETE_TYPE_P (type))
5055 if (funcdef_flag && DECL_NAME (parm) != 0)
5056 error ("parameter `%s' has incomplete type",
5057 IDENTIFIER_POINTER (DECL_NAME (parm)));
5059 warning ("parameter has incomplete type");
5062 TREE_VALUE (typelt) = error_mark_node;
5063 TREE_TYPE (parm) = error_mark_node;
5067 /* This has been replaced by parm_tags_warning, which
5068 uses a more accurate criterion for what to warn
5072 /* Now warn if is a pointer to an incomplete type. */
5073 while (TREE_CODE (type) == POINTER_TYPE
5074 || TREE_CODE (type) == REFERENCE_TYPE)
5075 type = TREE_TYPE (type);
5076 type = TYPE_MAIN_VARIANT (type);
5077 if (!COMPLETE_TYPE_P (type))
5079 if (DECL_NAME (parm) != 0)
5080 warning ("parameter `%s' points to incomplete type",
5081 IDENTIFIER_POINTER (DECL_NAME (parm)));
5083 warning ("parameter points to incomplete type");
5087 typelt = TREE_CHAIN (typelt);
5094 /* Return a tree_list node with info on a parameter list just parsed.
5095 The TREE_PURPOSE is a chain of decls of those parms.
5096 The TREE_VALUE is a list of structure, union and enum tags defined.
5097 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5098 This tree_list node is later fed to `grokparms'.
5100 VOID_AT_END nonzero means append `void' to the end of the type-list.
5101 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5104 get_parm_info (void_at_end)
5110 tree tags = gettags ();
5111 tree parms = getdecls ();
5113 tree order = current_binding_level->parm_order;
5115 /* Just `void' (and no ellipsis) is special. There are really no parms.
5116 But if the `void' is qualified (by `const' or `volatile') or has a
5117 storage class specifier (`register'), then the behavior is undefined;
5118 by not counting it as the special case of `void' we will cause an
5119 error later. Typedefs for `void' are OK (see DR#157). */
5120 if (void_at_end && parms != 0
5121 && TREE_CHAIN (parms) == 0
5122 && VOID_TYPE_P (TREE_TYPE (parms))
5123 && ! TREE_THIS_VOLATILE (parms)
5124 && ! TREE_READONLY (parms)
5125 && ! DECL_REGISTER (parms)
5126 && DECL_NAME (parms) == 0)
5129 storedecls (NULL_TREE);
5130 return tree_cons (NULL_TREE, NULL_TREE,
5131 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5134 /* Extract enumerator values and other non-parms declared with the parms.
5135 Likewise any forward parm decls that didn't have real parm decls. */
5136 for (decl = parms; decl;)
5138 tree next = TREE_CHAIN (decl);
5140 if (TREE_CODE (decl) != PARM_DECL)
5142 TREE_CHAIN (decl) = new_parms;
5145 else if (TREE_ASM_WRITTEN (decl))
5147 error_with_decl (decl,
5148 "parameter `%s' has just a forward declaration");
5149 TREE_CHAIN (decl) = new_parms;
5155 /* Put the parm decls back in the order they were in in the parm list. */
5156 for (t = order; t; t = TREE_CHAIN (t))
5159 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5161 TREE_CHAIN (TREE_VALUE (t)) = 0;
5164 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5167 /* Store the parmlist in the binding level since the old one
5168 is no longer a valid list. (We have changed the chain pointers.) */
5169 storedecls (new_parms);
5171 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5172 /* There may also be declarations for enumerators if an enumeration
5173 type is declared among the parms. Ignore them here. */
5174 if (TREE_CODE (decl) == PARM_DECL)
5176 /* Since there is a prototype,
5177 args are passed in their declared types. */
5178 tree type = TREE_TYPE (decl);
5179 DECL_ARG_TYPE (decl) = type;
5180 if (PROMOTE_PROTOTYPES
5181 && INTEGRAL_TYPE_P (type)
5182 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5183 DECL_ARG_TYPE (decl) = integer_type_node;
5185 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5186 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5187 && DECL_NAME (decl) == 0)
5189 error ("`void' in parameter list must be the entire list");
5195 return tree_cons (new_parms, tags,
5196 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5198 return tree_cons (new_parms, tags, nreverse (types));
5201 /* At end of parameter list, warn about any struct, union or enum tags
5202 defined within. Do so because these types cannot ever become complete. */
5205 parmlist_tags_warning ()
5210 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5212 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5213 /* An anonymous union parm type is meaningful as a GNU extension.
5214 So don't warn for that. */
5215 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5217 if (TREE_PURPOSE (elt) != 0)
5219 if (code == RECORD_TYPE)
5220 warning ("`struct %s' declared inside parameter list",
5221 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5222 else if (code == UNION_TYPE)
5223 warning ("`union %s' declared inside parameter list",
5224 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5226 warning ("`enum %s' declared inside parameter list",
5227 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5231 /* For translation these need to be separate warnings */
5232 if (code == RECORD_TYPE)
5233 warning ("anonymous struct declared inside parameter list");
5234 else if (code == UNION_TYPE)
5235 warning ("anonymous union declared inside parameter list");
5237 warning ("anonymous enum declared inside parameter list");
5241 warning ("its scope is only this definition or declaration, which is probably not what you want");
5247 /* Get the struct, enum or union (CODE says which) with tag NAME.
5248 Define the tag as a forward-reference if it is not defined. */
5251 xref_tag (code, name)
5252 enum tree_code code;
5255 /* If a cross reference is requested, look up the type
5256 already defined for this tag and return it. */
5258 tree ref = lookup_tag (code, name, current_binding_level, 0);
5259 /* If this is the right type of tag, return what we found.
5260 (This reference will be shadowed by shadow_tag later if appropriate.)
5261 If this is the wrong type of tag, do not return it. If it was the
5262 wrong type in the same binding level, we will have had an error
5263 message already; if in a different binding level and declaring
5264 a name, pending_xref_error will give an error message; but if in a
5265 different binding level and not declaring a name, this tag should
5266 shadow the previous declaration of a different type of tag, and
5267 this would not work properly if we return the reference found.
5268 (For example, with "struct foo" in an outer scope, "union foo;"
5269 must shadow that tag with a new one of union type.) */
5270 if (ref && TREE_CODE (ref) == code)
5273 /* If no such tag is yet defined, create a forward-reference node
5274 and record it as the "definition".
5275 When a real declaration of this type is found,
5276 the forward-reference will be altered into a real type. */
5278 ref = make_node (code);
5279 if (code == ENUMERAL_TYPE)
5281 /* Give the type a default layout like unsigned int
5282 to avoid crashing if it does not get defined. */
5283 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5284 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5285 TYPE_USER_ALIGN (ref) = 0;
5286 TREE_UNSIGNED (ref) = 1;
5287 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5288 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5289 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5292 pushtag (name, ref);
5297 /* Make sure that the tag NAME is defined *in the current binding level*
5298 at least as a forward reference.
5299 CODE says which kind of tag NAME ought to be. */
5302 start_struct (code, name)
5303 enum tree_code code;
5306 /* If there is already a tag defined at this binding level
5307 (as a forward reference), just return it. */
5312 ref = lookup_tag (code, name, current_binding_level, 1);
5313 if (ref && TREE_CODE (ref) == code)
5315 C_TYPE_BEING_DEFINED (ref) = 1;
5316 TYPE_PACKED (ref) = flag_pack_struct;
5317 if (TYPE_FIELDS (ref))
5319 if (code == UNION_TYPE)
5320 error ("redefinition of `union %s'",
5321 IDENTIFIER_POINTER (name));
5323 error ("redefinition of `struct %s'",
5324 IDENTIFIER_POINTER (name));
5330 /* Otherwise create a forward-reference just so the tag is in scope. */
5332 ref = make_node (code);
5333 pushtag (name, ref);
5334 C_TYPE_BEING_DEFINED (ref) = 1;
5335 TYPE_PACKED (ref) = flag_pack_struct;
5339 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5340 of a structure component, returning a FIELD_DECL node.
5341 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5343 This is done during the parsing of the struct declaration.
5344 The FIELD_DECL nodes are chained together and the lot of them
5345 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5348 grokfield (filename, line, declarator, declspecs, width)
5349 const char *filename ATTRIBUTE_UNUSED;
5350 int line ATTRIBUTE_UNUSED;
5351 tree declarator, declspecs, width;
5355 if (declarator == NULL_TREE && width == NULL_TREE)
5357 /* This is an unnamed decl.
5359 If we have something of the form "union { list } ;" then this
5360 is the anonymous union extension. Similarly for struct.
5362 If this is something of the form "struct foo;", then
5363 If MS extensions are enabled, this is handled as an
5365 Otherwise this is a forward declaration of a structure tag.
5367 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5368 If MS extensions are enabled and foo names a structure, then
5369 again this is an anonymous struct.
5370 Otherwise this is an error.
5372 Oh what a horrid tangled web we weave. I wonder if MS consiously
5373 took this from Plan 9 or if it was an accident of implementation
5374 that took root before someone noticed the bug... */
5376 tree type = TREE_VALUE (declspecs);
5378 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
5379 type = TREE_TYPE (type);
5380 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
5382 if (flag_ms_extensions)
5385 goto warn_unnamed_field;
5386 else if (TYPE_NAME (type) == NULL)
5389 goto warn_unnamed_field;
5394 warning ("declaration does not declare anything");
5399 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5401 finish_decl (value, NULL_TREE, NULL_TREE);
5402 DECL_INITIAL (value) = width;
5404 maybe_objc_check_decl (value);
5408 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5409 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5410 ATTRIBUTES are attributes to be applied to the structure. */
5413 finish_struct (t, fieldlist, attributes)
5419 int toplevel = global_binding_level == current_binding_level;
5420 int saw_named_field;
5422 /* If this type was previously laid out as a forward reference,
5423 make sure we lay it out again. */
5427 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5429 /* Nameless union parm types are useful as GCC extension. */
5430 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5431 /* Otherwise, warn about any struct or union def. in parmlist. */
5432 if (in_parm_level_p ())
5435 pedwarn ("%s defined inside parms",
5436 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5438 warning ("%s defined inside parms",
5439 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5444 for (x = fieldlist; x; x = TREE_CHAIN (x))
5445 if (DECL_NAME (x) != 0)
5449 pedwarn ("%s has no %s",
5450 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5451 fieldlist ? _("named members") : _("members"));
5454 /* Install struct as DECL_CONTEXT of each field decl.
5455 Also process specified field sizes,m which is found in the DECL_INITIAL.
5456 Store 0 there, except for ": 0" fields (so we can find them
5457 and delete them, below). */
5459 saw_named_field = 0;
5460 for (x = fieldlist; x; x = TREE_CHAIN (x))
5462 DECL_CONTEXT (x) = t;
5463 DECL_PACKED (x) |= TYPE_PACKED (t);
5465 /* If any field is const, the structure type is pseudo-const. */
5466 if (TREE_READONLY (x))
5467 C_TYPE_FIELDS_READONLY (t) = 1;
5470 /* A field that is pseudo-const makes the structure likewise. */
5471 tree t1 = TREE_TYPE (x);
5472 while (TREE_CODE (t1) == ARRAY_TYPE)
5473 t1 = TREE_TYPE (t1);
5474 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5475 && C_TYPE_FIELDS_READONLY (t1))
5476 C_TYPE_FIELDS_READONLY (t) = 1;
5479 /* Any field that is volatile means variables of this type must be
5480 treated in some ways as volatile. */
5481 if (TREE_THIS_VOLATILE (x))
5482 C_TYPE_FIELDS_VOLATILE (t) = 1;
5484 /* Any field of nominal variable size implies structure is too. */
5485 if (C_DECL_VARIABLE_SIZE (x))
5486 C_TYPE_VARIABLE_SIZE (t) = 1;
5488 /* Detect invalid nested redefinition. */
5489 if (TREE_TYPE (x) == t)
5490 error ("nested redefinition of `%s'",
5491 IDENTIFIER_POINTER (TYPE_NAME (t)));
5493 /* Detect invalid bit-field size. */
5494 if (DECL_INITIAL (x))
5495 STRIP_NOPS (DECL_INITIAL (x));
5496 if (DECL_INITIAL (x))
5498 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5499 constant_expression_warning (DECL_INITIAL (x));
5503 "bit-field `%s' width not an integer constant");
5504 DECL_INITIAL (x) = NULL;
5508 /* Detect invalid bit-field type. */
5509 if (DECL_INITIAL (x)
5510 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5511 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5512 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5514 error_with_decl (x, "bit-field `%s' has invalid type");
5515 DECL_INITIAL (x) = NULL;
5518 if (DECL_INITIAL (x) && pedantic
5519 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5520 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5521 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5522 /* Accept an enum that's equivalent to int or unsigned int. */
5523 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5524 && (TYPE_PRECISION (TREE_TYPE (x))
5525 == TYPE_PRECISION (integer_type_node))))
5526 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5528 /* Detect and ignore out of range field width and process valid
5530 if (DECL_INITIAL (x))
5533 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5534 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5536 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5537 error_with_decl (x, "negative width in bit-field `%s'");
5538 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5539 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5540 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5541 error_with_decl (x, "zero width for bit-field `%s'");
5544 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5545 unsigned HOST_WIDE_INT width
5546 = tree_low_cst (DECL_INITIAL (x), 1);
5548 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5549 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5550 TREE_UNSIGNED (TREE_TYPE (x)))
5552 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5553 TREE_UNSIGNED (TREE_TYPE (x))))))
5554 warning_with_decl (x,
5555 "`%s' is narrower than values of its type");
5557 DECL_SIZE (x) = bitsize_int (width);
5558 DECL_BIT_FIELD (x) = 1;
5559 SET_DECL_C_BIT_FIELD (x);
5562 && ! (* targetm.ms_bitfield_layout_p) (t))
5564 /* field size 0 => force desired amount of alignment. */
5565 #ifdef EMPTY_FIELD_BOUNDARY
5566 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5568 #ifdef PCC_BITFIELD_TYPE_MATTERS
5569 if (PCC_BITFIELD_TYPE_MATTERS)
5571 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5572 TYPE_ALIGN (TREE_TYPE (x)));
5573 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5580 else if (TREE_TYPE (x) != error_mark_node)
5582 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5583 : TYPE_ALIGN (TREE_TYPE (x)));
5585 /* Non-bit-fields are aligned for their type, except packed
5586 fields which require only BITS_PER_UNIT alignment. */
5587 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5588 if (! DECL_PACKED (x))
5589 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5592 DECL_INITIAL (x) = 0;
5594 /* Detect flexible array member in an invalid context. */
5595 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5596 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5597 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5598 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5600 if (TREE_CODE (t) == UNION_TYPE)
5601 error_with_decl (x, "flexible array member in union");
5602 else if (TREE_CHAIN (x) != NULL_TREE)
5603 error_with_decl (x, "flexible array member not at end of struct");
5604 else if (! saw_named_field)
5605 error_with_decl (x, "flexible array member in otherwise empty struct");
5608 saw_named_field = 1;
5611 /* Delete all duplicate fields from the fieldlist */
5612 for (x = fieldlist; x && TREE_CHAIN (x);)
5613 /* Anonymous fields aren't duplicates. */
5614 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5622 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5628 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5630 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5631 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5637 /* Now we have the nearly final fieldlist. Record it,
5638 then lay out the structure or union (including the fields). */
5640 TYPE_FIELDS (t) = fieldlist;
5644 /* Delete all zero-width bit-fields from the fieldlist */
5646 tree *fieldlistp = &fieldlist;
5648 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5649 *fieldlistp = TREE_CHAIN (*fieldlistp);
5651 fieldlistp = &TREE_CHAIN (*fieldlistp);
5654 /* Now we have the truly final field list.
5655 Store it in this type and in the variants. */
5657 TYPE_FIELDS (t) = fieldlist;
5659 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5661 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5662 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5663 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5664 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5667 /* If this was supposed to be a transparent union, but we can't
5668 make it one, warn and turn off the flag. */
5669 if (TREE_CODE (t) == UNION_TYPE
5670 && TYPE_TRANSPARENT_UNION (t)
5671 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5673 TYPE_TRANSPARENT_UNION (t) = 0;
5674 warning ("union cannot be made transparent");
5677 /* If this structure or union completes the type of any previous
5678 variable declaration, lay it out and output its rtl. */
5680 if (current_binding_level->incomplete_list != NULL_TREE)
5682 tree prev = NULL_TREE;
5684 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5686 tree decl = TREE_VALUE (x);
5688 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5689 && TREE_CODE (decl) != TYPE_DECL)
5691 layout_decl (decl, 0);
5692 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5693 maybe_objc_check_decl (decl);
5694 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5697 /* Unlink X from the incomplete list. */
5699 TREE_CHAIN (prev) = TREE_CHAIN (x);
5701 current_binding_level->incomplete_list = TREE_CHAIN (x);
5703 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5704 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5706 tree element = TREE_TYPE (decl);
5707 while (TREE_CODE (element) == ARRAY_TYPE)
5708 element = TREE_TYPE (element);
5711 layout_array_type (TREE_TYPE (decl));
5712 if (TREE_CODE (decl) != TYPE_DECL)
5714 layout_decl (decl, 0);
5715 maybe_objc_check_decl (decl);
5716 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5720 /* Unlink X from the incomplete list. */
5722 TREE_CHAIN (prev) = TREE_CHAIN (x);
5724 current_binding_level->incomplete_list = TREE_CHAIN (x);
5730 /* Finish debugging output for this type. */
5731 rest_of_type_compilation (t, toplevel);
5736 /* Lay out the type T, and its element type, and so on. */
5739 layout_array_type (t)
5742 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5743 layout_array_type (TREE_TYPE (t));
5747 /* Begin compiling the definition of an enumeration type.
5748 NAME is its name (or null if anonymous).
5749 Returns the type object, as yet incomplete.
5750 Also records info about it so that build_enumerator
5751 may be used to declare the individual values as they are read. */
5759 /* If this is the real definition for a previous forward reference,
5760 fill in the contents in the same object that used to be the
5761 forward reference. */
5764 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5766 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5768 enumtype = make_node (ENUMERAL_TYPE);
5769 pushtag (name, enumtype);
5772 C_TYPE_BEING_DEFINED (enumtype) = 1;
5774 if (TYPE_VALUES (enumtype) != 0)
5776 /* This enum is a named one that has been declared already. */
5777 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5779 /* Completely replace its old definition.
5780 The old enumerators remain defined, however. */
5781 TYPE_VALUES (enumtype) = 0;
5784 enum_next_value = integer_zero_node;
5787 if (flag_short_enums)
5788 TYPE_PACKED (enumtype) = 1;
5793 /* After processing and defining all the values of an enumeration type,
5794 install their decls in the enumeration type and finish it off.
5795 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5796 and ATTRIBUTES are the specified attributes.
5797 Returns ENUMTYPE. */
5800 finish_enum (enumtype, values, attributes)
5806 tree minnode = 0, maxnode = 0, enum_value_type;
5807 int precision, unsign;
5808 int toplevel = (global_binding_level == current_binding_level);
5810 if (in_parm_level_p ())
5811 warning ("enum defined inside parms");
5813 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5815 /* Calculate the maximum value of any enumerator in this type. */
5817 if (values == error_mark_node)
5818 minnode = maxnode = integer_zero_node;
5821 minnode = maxnode = TREE_VALUE (values);
5822 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5824 tree value = TREE_VALUE (pair);
5825 if (tree_int_cst_lt (maxnode, value))
5827 if (tree_int_cst_lt (value, minnode))
5832 /* Construct the final type of this enumeration. It is the same
5833 as one of the integral types - the narrowest one that fits, except
5834 that normally we only go as narrow as int - and signed iff any of
5835 the values are negative. */
5836 unsign = (tree_int_cst_sgn (minnode) >= 0);
5837 precision = MAX (min_precision (minnode, unsign),
5838 min_precision (maxnode, unsign));
5839 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5841 tree narrowest = c_common_type_for_size (precision, unsign);
5844 warning ("enumeration values exceed range of largest integer");
5845 narrowest = long_long_integer_type_node;
5848 precision = TYPE_PRECISION (narrowest);
5851 precision = TYPE_PRECISION (integer_type_node);
5853 if (precision == TYPE_PRECISION (integer_type_node))
5854 enum_value_type = c_common_type_for_size (precision, 0);
5856 enum_value_type = enumtype;
5858 TYPE_MIN_VALUE (enumtype) = minnode;
5859 TYPE_MAX_VALUE (enumtype) = maxnode;
5860 TYPE_PRECISION (enumtype) = precision;
5861 TREE_UNSIGNED (enumtype) = unsign;
5862 TYPE_SIZE (enumtype) = 0;
5863 layout_type (enumtype);
5865 if (values != error_mark_node)
5867 /* Change the type of the enumerators to be the enum type. We
5868 need to do this irrespective of the size of the enum, for
5869 proper type checking. Replace the DECL_INITIALs of the
5870 enumerators, and the value slots of the list, with copies
5871 that have the enum type; they cannot be modified in place
5872 because they may be shared (e.g. integer_zero_node) Finally,
5873 change the purpose slots to point to the names of the decls. */
5874 for (pair = values; pair; pair = TREE_CHAIN (pair))
5876 tree enu = TREE_PURPOSE (pair);
5878 TREE_TYPE (enu) = enumtype;
5879 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5880 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5881 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5882 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5883 DECL_MODE (enu) = TYPE_MODE (enumtype);
5885 /* The ISO C Standard mandates enumerators to have type int,
5886 even though the underlying type of an enum type is
5887 unspecified. Here we convert any enumerators that fit in
5888 an int to type int, to avoid promotions to unsigned types
5889 when comparing integers with enumerators that fit in the
5890 int range. When -pedantic is given, build_enumerator()
5891 would have already taken care of those that don't fit. */
5892 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5893 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5895 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5897 TREE_PURPOSE (pair) = DECL_NAME (enu);
5898 TREE_VALUE (pair) = DECL_INITIAL (enu);
5901 TYPE_VALUES (enumtype) = values;
5904 /* Fix up all variant types of this enum type. */
5905 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5907 if (tem == enumtype)
5909 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5910 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5911 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5912 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5913 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5914 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5915 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5916 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5917 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5918 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5921 /* Finish debugging output for this type. */
5922 rest_of_type_compilation (enumtype, toplevel);
5927 /* Build and install a CONST_DECL for one value of the
5928 current enumeration type (one that was begun with start_enum).
5929 Return a tree-list containing the CONST_DECL and its value.
5930 Assignment of sequential values by default is handled here. */
5933 build_enumerator (name, value)
5938 /* Validate and default VALUE. */
5940 /* Remove no-op casts from the value. */
5942 STRIP_TYPE_NOPS (value);
5946 if (TREE_CODE (value) == INTEGER_CST)
5948 value = default_conversion (value);
5949 constant_expression_warning (value);
5953 error ("enumerator value for `%s' not integer constant",
5954 IDENTIFIER_POINTER (name));
5959 /* Default based on previous value. */
5960 /* It should no longer be possible to have NON_LVALUE_EXPR
5964 value = enum_next_value;
5966 error ("overflow in enumeration values");
5969 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5971 pedwarn ("ISO C restricts enumerator values to range of `int'");
5972 value = convert (integer_type_node, value);
5975 /* Set basis for default for next value. */
5976 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5977 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5979 /* Now create a declaration for the enum value name. */
5981 type = TREE_TYPE (value);
5982 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5983 TYPE_PRECISION (integer_type_node)),
5984 (TYPE_PRECISION (type)
5985 >= TYPE_PRECISION (integer_type_node)
5986 && TREE_UNSIGNED (type)));
5988 decl = build_decl (CONST_DECL, name, type);
5989 DECL_INITIAL (decl) = convert (type, value);
5992 return tree_cons (decl, value, NULL_TREE);
5996 /* Create the FUNCTION_DECL for a function definition.
5997 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5998 the declaration; they describe the function's name and the type it returns,
5999 but twisted together in a fashion that parallels the syntax of C.
6001 This function creates a binding context for the function body
6002 as well as setting up the FUNCTION_DECL in current_function_decl.
6004 Returns 1 on success. If the DECLARATOR is not suitable for a function
6005 (it defines a datum instead), we return 0, which tells
6006 yyparse to report a parse error. */
6009 start_function (declspecs, declarator, attributes)
6010 tree declarator, declspecs, attributes;
6012 tree decl1, old_decl;
6014 int old_immediate_size_expand = immediate_size_expand;
6016 current_function_returns_value = 0; /* Assume, until we see it does. */
6017 current_function_returns_null = 0;
6018 current_function_returns_abnormally = 0;
6019 warn_about_return_type = 0;
6020 current_extern_inline = 0;
6022 shadowed_labels = 0;
6024 /* Don't expand any sizes in the return type of the function. */
6025 immediate_size_expand = 0;
6027 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6029 /* If the declarator is not suitable for a function definition,
6030 cause a syntax error. */
6033 immediate_size_expand = old_immediate_size_expand;
6037 decl_attributes (&decl1, attributes, 0);
6039 /* If #pragma weak was used, mark the decl weak now. */
6040 if (current_binding_level == global_binding_level)
6041 maybe_apply_pragma_weak (decl1);
6043 if (DECL_DECLARED_INLINE_P (decl1)
6044 && DECL_UNINLINABLE (decl1)
6045 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6046 warning_with_decl (decl1,
6047 "inline function `%s' given attribute noinline");
6049 announce_function (decl1);
6051 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6053 error ("return type is an incomplete type");
6054 /* Make it return void instead. */
6056 = build_function_type (void_type_node,
6057 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6060 if (warn_about_return_type)
6061 pedwarn_c99 ("return type defaults to `int'");
6063 /* Save the parm names or decls from this function's declarator
6064 where store_parm_decls will find them. */
6065 current_function_parms = last_function_parms;
6066 current_function_parm_tags = last_function_parm_tags;
6068 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6069 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6070 DECL_INITIAL (decl1) = error_mark_node;
6072 /* If this definition isn't a prototype and we had a prototype declaration
6073 before, copy the arg type info from that prototype.
6074 But not if what we had before was a builtin function. */
6075 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6076 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6077 && !DECL_BUILT_IN (old_decl)
6078 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6079 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6080 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6082 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6083 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6084 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6087 /* If there is no explicit declaration, look for any out-of-scope implicit
6090 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6092 /* Optionally warn of old-fashioned def with no previous prototype. */
6093 if (warn_strict_prototypes
6094 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6096 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6097 || (DECL_BUILT_IN (old_decl)
6098 && ! C_DECL_ANTICIPATED (old_decl)))))
6099 warning ("function declaration isn't a prototype");
6100 /* Optionally warn of any global def with no previous prototype. */
6101 else if (warn_missing_prototypes
6102 && TREE_PUBLIC (decl1)
6104 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6105 || (DECL_BUILT_IN (old_decl)
6106 && ! C_DECL_ANTICIPATED (old_decl))))
6107 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6108 warning_with_decl (decl1, "no previous prototype for `%s'");
6109 /* Optionally warn of any def with no previous prototype
6110 if the function has already been used. */
6111 else if (warn_missing_prototypes
6112 && old_decl != 0 && TREE_USED (old_decl)
6113 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6114 warning_with_decl (decl1,
6115 "`%s' was used with no prototype before its definition");
6116 /* Optionally warn of any global def with no previous declaration. */
6117 else if (warn_missing_declarations
6118 && TREE_PUBLIC (decl1)
6120 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6121 warning_with_decl (decl1, "no previous declaration for `%s'");
6122 /* Optionally warn of any def with no previous declaration
6123 if the function has already been used. */
6124 else if (warn_missing_declarations
6125 && old_decl != 0 && TREE_USED (old_decl)
6126 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6127 warning_with_decl (decl1,
6128 "`%s' was used with no declaration before its definition");
6130 /* This is a definition, not a reference.
6131 So normally clear DECL_EXTERNAL.
6132 However, `extern inline' acts like a declaration
6133 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6134 DECL_EXTERNAL (decl1) = current_extern_inline;
6136 /* This function exists in static storage.
6137 (This does not mean `static' in the C sense!) */
6138 TREE_STATIC (decl1) = 1;
6140 /* A nested function is not global. */
6141 if (current_function_decl != 0)
6142 TREE_PUBLIC (decl1) = 0;
6144 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6145 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6150 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6151 != integer_type_node)
6152 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6154 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6155 args = TREE_CHAIN (args))
6157 tree type = args ? TREE_VALUE (args) : 0;
6159 if (type == void_type_node)
6166 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6167 pedwarn_with_decl (decl1,
6168 "first argument of `%s' should be `int'");
6172 if (TREE_CODE (type) != POINTER_TYPE
6173 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6174 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6176 pedwarn_with_decl (decl1,
6177 "second argument of `%s' should be `char **'");
6181 if (TREE_CODE (type) != POINTER_TYPE
6182 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6183 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6185 pedwarn_with_decl (decl1,
6186 "third argument of `%s' should probably be `char **'");
6191 /* It is intentional that this message does not mention the third
6192 argument because it's only mentioned in an appendix of the
6194 if (argct > 0 && (argct < 2 || argct > 3))
6195 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6197 if (! TREE_PUBLIC (decl1))
6198 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6201 /* Record the decl so that the function name is defined.
6202 If we already have a decl for this name, and it is a FUNCTION_DECL,
6203 use the old decl. */
6205 current_function_decl = pushdecl (decl1);
6208 declare_parm_level (1);
6209 current_binding_level->subblocks_tag_transparent = 1;
6211 make_decl_rtl (current_function_decl, NULL);
6213 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6214 /* Promote the value to int before returning it. */
6215 if (c_promoting_integer_type_p (restype))
6217 /* It retains unsignedness if not really getting wider. */
6218 if (TREE_UNSIGNED (restype)
6219 && (TYPE_PRECISION (restype)
6220 == TYPE_PRECISION (integer_type_node)))
6221 restype = unsigned_type_node;
6223 restype = integer_type_node;
6225 DECL_RESULT (current_function_decl)
6226 = build_decl (RESULT_DECL, NULL_TREE, restype);
6228 /* If this fcn was already referenced via a block-scope `extern' decl
6229 (or an implicit decl), propagate certain information about the usage. */
6230 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6231 TREE_ADDRESSABLE (current_function_decl) = 1;
6233 immediate_size_expand = old_immediate_size_expand;
6235 start_fname_decls ();
6240 /* Store the parameter declarations into the current function declaration.
6241 This is called after parsing the parameter declarations, before
6242 digesting the body of the function.
6244 For an old-style definition, modify the function's type
6245 to specify at least the number of arguments. */
6250 tree fndecl = current_function_decl;
6253 /* This is either a chain of PARM_DECLs (if a prototype was used)
6254 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6255 tree specparms = current_function_parms;
6257 /* This is a list of types declared among parms in a prototype. */
6258 tree parmtags = current_function_parm_tags;
6260 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6261 tree parmdecls = getdecls ();
6263 /* This is a chain of any other decls that came in among the parm
6264 declarations. If a parm is declared with enum {foo, bar} x;
6265 then CONST_DECLs for foo and bar are put here. */
6268 /* The function containing FNDECL, if any. */
6269 tree context = decl_function_context (fndecl);
6271 /* Nonzero if this definition is written with a prototype. */
6274 int saved_warn_shadow = warn_shadow;
6276 /* Don't re-emit shadow warnings. */
6279 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6281 /* This case is when the function was defined with an ANSI prototype.
6282 The parms already have decls, so we need not do anything here
6283 except record them as in effect
6284 and complain if any redundant old-style parm decls were written. */
6295 error_with_decl (fndecl,
6296 "parm types given both in parmlist and separately");
6297 /* Get rid of the erroneous decls; don't keep them on
6298 the list of parms, since they might not be PARM_DECLs. */
6299 for (decl = current_binding_level->names;
6300 decl; decl = TREE_CHAIN (decl))
6301 if (DECL_NAME (decl))
6302 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6303 for (link = current_binding_level->shadowed;
6304 link; link = TREE_CHAIN (link))
6305 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6306 current_binding_level->names = 0;
6307 current_binding_level->shadowed = 0;
6310 specparms = nreverse (specparms);
6311 for (parm = specparms; parm; parm = next)
6313 next = TREE_CHAIN (parm);
6314 if (TREE_CODE (parm) == PARM_DECL)
6316 if (DECL_NAME (parm) == 0)
6317 error_with_decl (parm, "parameter name omitted");
6318 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6319 && VOID_TYPE_P (TREE_TYPE (parm)))
6321 error_with_decl (parm, "parameter `%s' declared void");
6322 /* Change the type to error_mark_node so this parameter
6323 will be ignored by assign_parms. */
6324 TREE_TYPE (parm) = error_mark_node;
6330 /* If we find an enum constant or a type tag,
6331 put it aside for the moment. */
6332 TREE_CHAIN (parm) = 0;
6333 others = chainon (others, parm);
6337 /* Get the decls in their original chain order
6338 and record in the function. */
6339 DECL_ARGUMENTS (fndecl) = getdecls ();
6342 /* If this function takes a variable number of arguments,
6343 add a phony parameter to the end of the parm list,
6344 to represent the position of the first unnamed argument. */
6345 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6348 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6349 /* Let's hope the address of the unnamed parm
6350 won't depend on its type. */
6351 TREE_TYPE (dummy) = integer_type_node;
6352 DECL_ARG_TYPE (dummy) = integer_type_node;
6353 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6357 /* Now pushdecl the enum constants. */
6358 for (parm = others; parm; parm = next)
6360 next = TREE_CHAIN (parm);
6361 if (DECL_NAME (parm) == 0)
6363 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6365 else if (TREE_CODE (parm) != PARM_DECL)
6369 storetags (chainon (parmtags, gettags ()));
6373 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6374 each with a parm name as the TREE_VALUE.
6376 PARMDECLS is a chain of declarations for parameters.
6377 Warning! It can also contain CONST_DECLs which are not parameters
6378 but are names of enumerators of any enum types
6379 declared among the parameters.
6381 First match each formal parameter name with its declaration.
6382 Associate decls with the names and store the decls
6383 into the TREE_PURPOSE slots. */
6385 /* We use DECL_WEAK as a flag to show which parameters have been
6386 seen already since it is not used on PARM_DECL or CONST_DECL. */
6387 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6388 DECL_WEAK (parm) = 0;
6390 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6392 tree tail, found = NULL;
6394 if (TREE_VALUE (parm) == 0)
6396 error_with_decl (fndecl,
6397 "parameter name missing from parameter list");
6398 TREE_PURPOSE (parm) = 0;
6402 /* See if any of the parmdecls specifies this parm by name.
6403 Ignore any enumerator decls. */
6404 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6405 if (DECL_NAME (tail) == TREE_VALUE (parm)
6406 && TREE_CODE (tail) == PARM_DECL)
6412 /* If declaration already marked, we have a duplicate name.
6413 Complain, and don't use this decl twice. */
6414 if (found && DECL_WEAK (found))
6416 error_with_decl (found, "multiple parameters named `%s'");
6420 /* If the declaration says "void", complain and ignore it. */
6421 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6423 error_with_decl (found, "parameter `%s' declared void");
6424 TREE_TYPE (found) = integer_type_node;
6425 DECL_ARG_TYPE (found) = integer_type_node;
6426 layout_decl (found, 0);
6429 /* If no declaration found, default to int. */
6432 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6434 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6435 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6436 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6438 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6439 else if (extra_warnings)
6440 warning_with_decl (found, "type of `%s' defaults to `int'");
6444 TREE_PURPOSE (parm) = found;
6446 /* Mark this decl as "already found". */
6447 DECL_WEAK (found) = 1;
6450 /* Put anything which is on the parmdecls chain and which is
6451 not a PARM_DECL onto the list NONPARMS. (The types of
6452 non-parm things which might appear on the list include
6453 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6454 any actual PARM_DECLs not matched with any names. */
6457 for (parm = parmdecls; parm;)
6459 tree next = TREE_CHAIN (parm);
6460 TREE_CHAIN (parm) = 0;
6462 if (TREE_CODE (parm) != PARM_DECL)
6463 nonparms = chainon (nonparms, parm);
6466 /* Complain about args with incomplete types. */
6467 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6469 error_with_decl (parm, "parameter `%s' has incomplete type");
6470 TREE_TYPE (parm) = error_mark_node;
6473 if (! DECL_WEAK (parm))
6475 error_with_decl (parm,
6476 "declaration for parameter `%s' but no such parameter");
6477 /* Pretend the parameter was not missing.
6478 This gets us to a standard state and minimizes
6479 further error messages. */
6481 = chainon (specparms,
6482 tree_cons (parm, NULL_TREE, NULL_TREE));
6489 /* Chain the declarations together in the order of the list of
6490 names. Store that chain in the function decl, replacing the
6493 DECL_ARGUMENTS (fndecl) = 0;
6496 for (last = 0; parm; parm = TREE_CHAIN (parm))
6497 if (TREE_PURPOSE (parm))
6500 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6502 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6503 last = TREE_PURPOSE (parm);
6504 TREE_CHAIN (last) = 0;
6508 /* If there was a previous prototype,
6509 set the DECL_ARG_TYPE of each argument according to
6510 the type previously specified, and report any mismatches. */
6512 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6515 for (parm = DECL_ARGUMENTS (fndecl),
6516 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6517 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6518 != void_type_node));
6519 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6521 if (parm == 0 || type == 0
6522 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6524 error ("number of arguments doesn't match prototype");
6525 error_with_file_and_line (current_function_prototype_file,
6526 current_function_prototype_line,
6527 "prototype declaration");
6530 /* Type for passing arg must be consistent with that
6531 declared for the arg. ISO C says we take the unqualified
6532 type for parameters declared with qualified type. */
6533 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6534 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6536 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6537 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6539 /* Adjust argument to match prototype. E.g. a previous
6540 `int foo(float);' prototype causes
6541 `int foo(x) float x; {...}' to be treated like
6542 `int foo(float x) {...}'. This is particularly
6543 useful for argument types like uid_t. */
6544 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6546 if (PROMOTE_PROTOTYPES
6547 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6548 && TYPE_PRECISION (TREE_TYPE (parm))
6549 < TYPE_PRECISION (integer_type_node))
6550 DECL_ARG_TYPE (parm) = integer_type_node;
6554 pedwarn ("promoted argument `%s' doesn't match prototype",
6555 IDENTIFIER_POINTER (DECL_NAME (parm)));
6556 warning_with_file_and_line
6557 (current_function_prototype_file,
6558 current_function_prototype_line,
6559 "prototype declaration");
6564 error ("argument `%s' doesn't match prototype",
6565 IDENTIFIER_POINTER (DECL_NAME (parm)));
6566 error_with_file_and_line (current_function_prototype_file,
6567 current_function_prototype_line,
6568 "prototype declaration");
6572 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6575 /* Otherwise, create a prototype that would match. */
6579 tree actual = 0, last = 0, type;
6581 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6583 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6585 TREE_CHAIN (last) = type;
6590 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6592 TREE_CHAIN (last) = type;
6596 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6597 of the type of this function, but we need to avoid having this
6598 affect the types of other similarly-typed functions, so we must
6599 first force the generation of an identical (but separate) type
6600 node for the relevant function type. The new node we create
6601 will be a variant of the main variant of the original function
6604 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6606 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6609 /* Now store the final chain of decls for the arguments
6610 as the decl-chain of the current lexical scope.
6611 Put the enumerators in as well, at the front so that
6612 DECL_ARGUMENTS is not modified. */
6614 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6617 /* Make sure the binding level for the top of the function body
6618 gets a BLOCK if there are any in the function.
6619 Otherwise, the dbx output is wrong. */
6621 keep_next_if_subblocks = 1;
6623 /* ??? This might be an improvement,
6624 but needs to be thought about some more. */
6626 keep_next_level_flag = 1;
6629 /* Write a record describing this function definition to the prototypes
6630 file (if requested). */
6632 gen_aux_info_record (fndecl, 1, 0, prototype);
6634 /* Initialize the RTL code for the function. */
6635 init_function_start (fndecl, input_filename, lineno);
6637 /* Begin the statement tree for this function. */
6638 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6640 /* If this is a nested function, save away the sizes of any
6641 variable-size types so that we can expand them when generating
6647 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6648 = nreverse (get_pending_sizes ());
6649 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6652 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6655 /* This function is being processed in whole-function mode. */
6656 cfun->x_whole_function_mode_p = 1;
6658 /* Even though we're inside a function body, we still don't want to
6659 call expand_expr to calculate the size of a variable-sized array.
6660 We haven't necessarily assigned RTL to all variables yet, so it's
6661 not safe to try to expand expressions involving them. */
6662 immediate_size_expand = 0;
6663 cfun->x_dont_save_pending_sizes_p = 1;
6665 warn_shadow = saved_warn_shadow;
6668 /* Finish up a function declaration and compile that function
6669 all the way to assembler language output. The free the storage
6670 for the function definition.
6672 This is called after parsing the body of the function definition.
6674 NESTED is nonzero if the function being finished is nested in another.
6675 CAN_DEFER_P is nonzero if the function may be deferred. */
6678 finish_function (nested, can_defer_p)
6682 tree fndecl = current_function_decl;
6685 /* This caused &foo to be of type ptr-to-const-function which then
6686 got a warning when stored in a ptr-to-function variable. */
6687 TREE_READONLY (fndecl) = 1;
6691 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6693 /* Must mark the RESULT_DECL as being in this function. */
6695 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6697 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6699 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6700 != integer_type_node)
6702 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6703 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6705 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6709 #ifdef DEFAULT_MAIN_RETURN
6710 /* Make it so that `main' always returns success by default. */
6711 DEFAULT_MAIN_RETURN;
6714 c_expand_return (integer_zero_node);
6719 finish_fname_decls ();
6721 /* Tie off the statement tree for this function. */
6722 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6724 /* Complain if there's just no return statement. */
6725 if (warn_return_type
6726 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6727 && !current_function_returns_value && !current_function_returns_null
6728 /* Don't complain if we abort. */
6729 && !current_function_returns_abnormally
6730 /* Don't warn for main(). */
6731 && !MAIN_NAME_P (DECL_NAME (fndecl))
6732 /* Or if they didn't actually specify a return type. */
6733 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6734 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6735 inline function, as we might never be compiled separately. */
6736 && DECL_INLINE (fndecl))
6737 warning ("no return statement in function returning non-void");
6739 /* Clear out memory we no longer need. */
6740 free_after_parsing (cfun);
6741 /* Since we never call rest_of_compilation, we never clear
6742 CFUN. Do so explicitly. */
6743 free_after_compilation (cfun);
6748 /* Generate RTL for the body of this function. */
6749 c_expand_body (fndecl, nested, can_defer_p);
6751 /* Let the error reporting routines know that we're outside a
6752 function. For a nested function, this value is used in
6753 c_pop_function_context and then reset via pop_function_context. */
6754 current_function_decl = NULL;
6758 /* Generate the RTL for a deferred function FNDECL. */
6761 c_expand_deferred_function (fndecl)
6764 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6765 function was deferred, e.g. in duplicate_decls. */
6766 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6768 c_expand_body (fndecl, 0, 0);
6769 current_function_decl = NULL;
6773 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6774 then we are already in the process of generating RTL for another
6775 function. If can_defer_p is zero, we won't attempt to defer the
6776 generation of RTL. */
6779 c_expand_body (fndecl, nested_p, can_defer_p)
6781 int nested_p, can_defer_p;
6783 int uninlinable = 1;
6785 /* There's no reason to do any of the work here if we're only doing
6786 semantic analysis; this code just generates RTL. */
6787 if (flag_syntax_only)
6790 if (flag_inline_trees)
6792 /* First, cache whether the current function is inlinable. Some
6793 predicates depend on cfun and current_function_decl to
6794 function completely. */
6795 timevar_push (TV_INTEGRATION);
6796 uninlinable = ! tree_inlinable_function_p (fndecl);
6798 if (! uninlinable && can_defer_p
6799 /* Save function tree for inlining. Should return 0 if the
6800 language does not support function deferring or the
6801 function could not be deferred. */
6802 && defer_fn (fndecl))
6804 /* Let the back-end know that this function exists. */
6805 (*debug_hooks->deferred_inline_function) (fndecl);
6806 timevar_pop (TV_INTEGRATION);
6810 /* Then, inline any functions called in it. */
6811 optimize_inline_calls (fndecl);
6812 timevar_pop (TV_INTEGRATION);
6815 timevar_push (TV_EXPAND);
6819 /* Make sure that we will evaluate variable-sized types involved
6820 in our function's type. */
6821 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6822 /* Squirrel away our current state. */
6823 push_function_context ();
6826 /* Initialize the RTL code for the function. */
6827 current_function_decl = fndecl;
6828 input_filename = DECL_SOURCE_FILE (fndecl);
6829 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6831 /* This function is being processed in whole-function mode. */
6832 cfun->x_whole_function_mode_p = 1;
6834 /* Even though we're inside a function body, we still don't want to
6835 call expand_expr to calculate the size of a variable-sized array.
6836 We haven't necessarily assigned RTL to all variables yet, so it's
6837 not safe to try to expand expressions involving them. */
6838 immediate_size_expand = 0;
6839 cfun->x_dont_save_pending_sizes_p = 1;
6841 /* Set up parameters and prepare for return, for the function. */
6842 expand_function_start (fndecl, 0);
6844 /* If this function is `main', emit a call to `__main'
6845 to run global initializers, etc. */
6846 if (DECL_NAME (fndecl)
6847 && MAIN_NAME_P (DECL_NAME (fndecl))
6848 && DECL_CONTEXT (fndecl) == NULL_TREE)
6849 expand_main_function ();
6851 /* Generate the RTL for this function. */
6852 expand_stmt (DECL_SAVED_TREE (fndecl));
6855 /* Allow the body of the function to be garbage collected. */
6856 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6859 /* We hard-wired immediate_size_expand to zero above.
6860 expand_function_end will decrement this variable. So, we set the
6861 variable to one here, so that after the decrement it will remain
6863 immediate_size_expand = 1;
6865 /* Allow language dialects to perform special processing. */
6866 if (lang_expand_function_end)
6867 (*lang_expand_function_end) ();
6869 /* Generate rtl for function exit. */
6870 expand_function_end (input_filename, lineno, 0);
6872 /* If this is a nested function, protect the local variables in the stack
6873 above us from being collected while we're compiling this function. */
6875 ggc_push_context ();
6877 /* Run the optimizers and output the assembler code for this function. */
6878 rest_of_compilation (fndecl);
6880 /* Undo the GC context switch. */
6884 /* With just -W, complain only if function returns both with
6885 and without a value. */
6887 && current_function_returns_value
6888 && current_function_returns_null)
6889 warning ("this function may return with or without a value");
6891 /* If requested, warn about function definitions where the function will
6892 return a value (usually of some struct or union type) which itself will
6893 take up a lot of stack space. */
6895 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6897 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6899 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6900 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6901 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6904 unsigned int size_as_int
6905 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6907 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6908 warning_with_decl (fndecl,
6909 "size of return value of `%s' is %u bytes",
6912 warning_with_decl (fndecl,
6913 "size of return value of `%s' is larger than %d bytes",
6918 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6919 && ! flag_inline_trees)
6921 /* Stop pointing to the local nodes about to be freed.
6922 But DECL_INITIAL must remain nonzero so we know this
6923 was an actual function definition.
6924 For a nested function, this is done in c_pop_function_context.
6925 If rest_of_compilation set this to 0, leave it 0. */
6926 if (DECL_INITIAL (fndecl) != 0)
6927 DECL_INITIAL (fndecl) = error_mark_node;
6929 DECL_ARGUMENTS (fndecl) = 0;
6932 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6934 if (targetm.have_ctors_dtors)
6935 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6936 DEFAULT_INIT_PRIORITY);
6938 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6941 if (DECL_STATIC_DESTRUCTOR (fndecl))
6943 if (targetm.have_ctors_dtors)
6944 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6945 DEFAULT_INIT_PRIORITY);
6947 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6951 /* Return to the enclosing function. */
6952 pop_function_context ();
6953 timevar_pop (TV_EXPAND);
6956 /* Check the declarations given in a for-loop for satisfying the C99
6959 check_for_loop_decls ()
6965 /* If we get here, declarations have been used in a for loop without
6966 the C99 for loop scope. This doesn't make much sense, so don't
6968 error ("`for' loop initial declaration used outside C99 mode");
6971 /* C99 subclause 6.8.5 paragraph 3:
6973 [#3] The declaration part of a for statement shall only
6974 declare identifiers for objects having storage class auto or
6977 It isn't clear whether, in this sentence, "identifiers" binds to
6978 "shall only declare" or to "objects" - that is, whether all identifiers
6979 declared must be identifiers for objects, or whether the restriction
6980 only applies to those that are. (A question on this in comp.std.c
6981 in November 2000 received no answer.) We implement the strictest
6982 interpretation, to avoid creating an extension which later causes
6985 for (t = gettags (); t; t = TREE_CHAIN (t))
6987 if (TREE_PURPOSE (t) != 0)
6989 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6991 if (code == RECORD_TYPE)
6992 error ("`struct %s' declared in `for' loop initial declaration",
6993 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6994 else if (code == UNION_TYPE)
6995 error ("`union %s' declared in `for' loop initial declaration",
6996 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6998 error ("`enum %s' declared in `for' loop initial declaration",
6999 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7003 for (t = getdecls (); t; t = TREE_CHAIN (t))
7005 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7006 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7007 else if (TREE_STATIC (t))
7008 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7009 else if (DECL_EXTERNAL (t))
7010 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7014 /* Save and restore the variables in this file and elsewhere
7015 that keep track of the progress of compilation of the current function.
7016 Used for nested functions. */
7018 struct language_function GTY(())
7020 struct c_language_function base;
7022 tree shadowed_labels;
7025 int returns_abnormally;
7026 int warn_about_return_type;
7028 struct binding_level *binding_level;
7031 /* Save and reinitialize the variables
7032 used during compilation of a C function. */
7035 c_push_function_context (f)
7038 struct language_function *p;
7039 p = ((struct language_function *)
7040 ggc_alloc (sizeof (struct language_function)));
7043 p->base.x_stmt_tree = c_stmt_tree;
7044 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7045 p->named_labels = named_labels;
7046 p->shadowed_labels = shadowed_labels;
7047 p->returns_value = current_function_returns_value;
7048 p->returns_null = current_function_returns_null;
7049 p->returns_abnormally = current_function_returns_abnormally;
7050 p->warn_about_return_type = warn_about_return_type;
7051 p->extern_inline = current_extern_inline;
7052 p->binding_level = current_binding_level;
7055 /* Restore the variables used during compilation of a C function. */
7058 c_pop_function_context (f)
7061 struct language_function *p = f->language;
7064 /* Bring back all the labels that were shadowed. */
7065 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7066 if (DECL_NAME (TREE_VALUE (link)) != 0)
7067 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7068 = TREE_VALUE (link);
7070 if (DECL_SAVED_INSNS (current_function_decl) == 0
7071 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7073 /* Stop pointing to the local nodes about to be freed. */
7074 /* But DECL_INITIAL must remain nonzero so we know this
7075 was an actual function definition. */
7076 DECL_INITIAL (current_function_decl) = error_mark_node;
7077 DECL_ARGUMENTS (current_function_decl) = 0;
7080 c_stmt_tree = p->base.x_stmt_tree;
7081 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7082 named_labels = p->named_labels;
7083 shadowed_labels = p->shadowed_labels;
7084 current_function_returns_value = p->returns_value;
7085 current_function_returns_null = p->returns_null;
7086 current_function_returns_abnormally = p->returns_abnormally;
7087 warn_about_return_type = p->warn_about_return_type;
7088 current_extern_inline = p->extern_inline;
7089 current_binding_level = p->binding_level;
7094 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7097 c_dup_lang_specific_decl (decl)
7100 struct lang_decl *ld;
7102 if (!DECL_LANG_SPECIFIC (decl))
7105 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7106 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7107 sizeof (struct lang_decl));
7108 DECL_LANG_SPECIFIC (decl) = ld;
7111 /* The functions below are required for functionality of doing
7112 function at once processing in the C front end. Currently these
7113 functions are not called from anywhere in the C front end, but as
7114 these changes continue, that will change. */
7116 /* Returns non-zero if the current statement is a full expression,
7117 i.e. temporaries created during that statement should be destroyed
7118 at the end of the statement. */
7121 stmts_are_full_exprs_p ()
7126 /* Returns the stmt_tree (if any) to which statements are currently
7127 being added. If there is no active statement-tree, NULL is
7131 current_stmt_tree ()
7133 return &c_stmt_tree;
7136 /* Returns the stack of SCOPE_STMTs for the current function. */
7139 current_scope_stmt_stack ()
7141 return &c_scope_stmt_stack;
7144 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7148 anon_aggr_type_p (node)
7149 tree node ATTRIBUTE_UNUSED;
7154 /* Dummy function in place of callback used by C++. */
7157 extract_interface_info ()
7161 /* Return a new COMPOUND_STMT, after adding it to the current
7165 c_begin_compound_stmt ()
7169 /* Create the COMPOUND_STMT. */
7170 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7175 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7179 c_expand_decl_stmt (t)
7182 tree decl = DECL_STMT_DECL (t);
7184 /* Expand nested functions. */
7185 if (TREE_CODE (decl) == FUNCTION_DECL
7186 && DECL_CONTEXT (decl) == current_function_decl
7187 && DECL_SAVED_TREE (decl))
7188 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7191 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7192 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7195 identifier_global_value (t)
7198 return IDENTIFIER_GLOBAL_VALUE (t);
7201 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7202 otherwise the name is found in ridpointers from RID_INDEX. */
7205 record_builtin_type (rid_index, name, type)
7212 id = ridpointers[(int) rid_index];
7214 id = get_identifier (name);
7215 pushdecl (build_decl (TYPE_DECL, id, type));
7218 /* Build the void_list_node (void_type_node having been created). */
7220 build_void_list_node ()
7222 tree t = build_tree_list (NULL_TREE, void_type_node);
7226 /* Return something to represent absolute declarators containing a *.
7227 TARGET is the absolute declarator that the * contains.
7228 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
7229 to apply to the pointer type, represented as identifiers, possible mixed
7232 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
7233 if attributes are present) and whose type is the modifier list. */
7236 make_pointer_declarator (type_quals_attrs, target)
7237 tree type_quals_attrs, target;
7240 tree itarget = target;
7241 split_specs_attrs (type_quals_attrs, &quals, &attrs);
7242 if (attrs != NULL_TREE)
7243 itarget = tree_cons (attrs, target, NULL_TREE);
7244 return build1 (INDIRECT_REF, quals, itarget);
7247 #include "gt-c-decl.h"