1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "tree-inline.h"
51 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
53 { NORMAL, /* Ordinary declaration */
54 FUNCDEF, /* Function definition */
55 PARM, /* Declaration of parm before function body */
56 FIELD, /* Declaration inside struct or union */
57 BITFIELD, /* Likewise but with specified width */
58 TYPENAME}; /* Typename (inside cast or sizeof) */
61 /* Nonzero if we have seen an invalid cross reference
62 to a struct, union, or enum, but not yet printed the message. */
64 tree pending_invalid_xref;
65 /* File and line to appear in the eventual error message. */
66 const char *pending_invalid_xref_file;
67 int pending_invalid_xref_line;
69 /* While defining an enum type, this is 1 plus the last enumerator
70 constant value. Note that will do not have to save this or `enum_overflow'
71 around nested function definition since such a definition could only
72 occur in an enum value expression and we don't use these variables in
75 static tree enum_next_value;
77 /* Nonzero means that there was overflow computing enum_next_value. */
79 static int enum_overflow;
81 /* Parsing a function declarator leaves a list of parameter names
82 or a chain or parameter decls here. */
84 static tree last_function_parms;
86 /* Parsing a function declarator leaves here a chain of structure
87 and enum types declared in the parmlist. */
89 static tree last_function_parm_tags;
91 /* After parsing the declarator that starts a function definition,
92 `start_function' puts here the list of parameter names or chain of decls.
93 `store_parm_decls' finds it here. */
95 static tree current_function_parms;
97 /* Similar, for last_function_parm_tags. */
98 static tree current_function_parm_tags;
100 /* Similar, for the file and line that the prototype came from if this is
101 an old-style definition. */
102 static const char *current_function_prototype_file;
103 static int current_function_prototype_line;
105 /* The current statement tree. */
107 static struct stmt_tree_s c_stmt_tree;
109 /* The current scope statement stack. */
111 static tree c_scope_stmt_stack;
113 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
114 that have names. Here so we can clear out their names' definitions
115 at the end of the function. */
117 static tree named_labels;
119 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
121 static tree shadowed_labels;
123 /* Nonzero when store_parm_decls is called indicates a varargs function.
124 Value not meaningful after store_parm_decls. */
126 static int c_function_varargs;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement that specifies a return value is seen. */
131 int current_function_returns_value;
133 /* Set to 0 at beginning of a function definition, set to 1 if
134 a return statement with no argument is seen. */
136 int current_function_returns_null;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a call to a noreturn function is seen. */
141 int current_function_returns_abnormally;
143 /* Set to nonzero by `grokdeclarator' for a function
144 whose return type is defaulted, if warnings for this are desired. */
146 static int warn_about_return_type;
148 /* Nonzero when starting a function declared `extern inline'. */
150 static int current_extern_inline;
152 /* For each binding contour we allocate a binding_level structure
153 * which records the names defined in that contour.
156 * 1) one for each function definition,
157 * where internal declarations of the parameters appear.
158 * 2) one for each compound statement,
159 * to record its declarations.
161 * The current meaning of a name can be found by searching the levels from
162 * the current one out to the global one.
165 /* Note that the information in the `names' component of the global contour
166 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
170 /* A chain of _DECL nodes for all variables, constants, functions,
171 and typedef types. These are in the reverse of the order supplied.
175 /* A list of structure, union and enum definitions,
176 * for looking up tag names.
177 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
178 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
179 * or ENUMERAL_TYPE node.
183 /* For each level, a list of shadowed outer-level local definitions
184 to be restored when this level is popped.
185 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
186 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
189 /* For each level (except not the global one),
190 a chain of BLOCK nodes for all the levels
191 that were entered and exited one level down. */
194 /* The BLOCK node for this level, if one has been preallocated.
195 If 0, the BLOCK is allocated (if needed) when the level is popped. */
198 /* The binding level which this one is contained in (inherits from). */
199 struct binding_level *level_chain;
201 /* Nonzero for the level that holds the parameters of a function. */
204 /* Nonzero if this level "doesn't exist" for tags. */
205 char tag_transparent;
207 /* Nonzero if sublevels of this level "don't exist" for tags.
208 This is set in the parm level of a function definition
209 while reading the function body, so that the outermost block
210 of the function body will be tag-transparent. */
211 char subblocks_tag_transparent;
213 /* Nonzero means make a BLOCK for this level regardless of all else. */
216 /* Nonzero means make a BLOCK if this level has any subblocks. */
217 char keep_if_subblocks;
219 /* Number of decls in `names' that have incomplete
220 structure or union types. */
223 /* A list of decls giving the (reversed) specified order of parms,
224 not including any forward-decls in the parmlist.
225 This is so we can put the parms in proper order for assign_parms. */
229 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
231 /* The binding level currently in effect. */
233 static struct binding_level *current_binding_level;
235 /* A chain of binding_level structures awaiting reuse. */
237 static struct binding_level *free_binding_level;
239 /* The outermost binding level, for names of file scope.
240 This is created when the compiler is started and exists
241 through the entire run. */
243 static struct binding_level *global_binding_level;
245 /* Binding level structures are initialized by copying this one. */
247 static struct binding_level clear_binding_level
248 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
251 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
253 static int keep_next_level_flag;
255 /* Nonzero means make a BLOCK for the next level pushed
256 if it has subblocks. */
258 static int keep_next_if_subblocks;
260 /* The chain of outer levels of label scopes.
261 This uses the same data structure used for binding levels,
262 but it works differently: each link in the chain records
263 saved values of named_labels and shadowed_labels for
264 a label binding level outside the current one. */
266 static struct binding_level *label_level_chain;
268 /* Functions called automatically at the beginning and end of execution. */
270 tree static_ctors, static_dtors;
272 /* Forward declarations. */
274 static struct binding_level * make_binding_level PARAMS ((void));
275 static void mark_binding_level PARAMS ((void *));
276 static void clear_limbo_values PARAMS ((tree));
277 static int duplicate_decls PARAMS ((tree, tree, int));
278 static int redeclaration_error_message PARAMS ((tree, tree));
279 static void storedecls PARAMS ((tree));
280 static void storetags PARAMS ((tree));
281 static tree lookup_tag PARAMS ((enum tree_code, tree,
282 struct binding_level *, int));
283 static tree lookup_tag_reverse PARAMS ((tree));
284 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
286 static tree grokparms PARAMS ((tree, int));
287 static void layout_array_type PARAMS ((tree));
288 static tree c_make_fname_decl PARAMS ((tree, int));
289 static void c_expand_body PARAMS ((tree, int, int));
290 static void warn_if_shadowing PARAMS ((tree, tree));
292 /* C-specific option variables. */
294 /* Nonzero means allow type mismatches in conditional expressions;
295 just make their values `void'. */
297 int flag_cond_mismatch;
299 /* Nonzero means don't recognize the keyword `asm'. */
303 /* Nonzero means enable C89 Amendment 1 features. */
307 /* Nonzero means use the ISO C99 dialect of C. */
311 /* Nonzero means that we have builtin functions, and main is an int */
315 /* Nonzero means add default format_arg attributes for functions not
318 int flag_noniso_default_format_attributes = 1;
320 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
322 int flag_signed_bitfields = 1;
323 int explicit_flag_signed_bitfields = 0;
325 /* Nonzero means warn about use of implicit int. */
327 int warn_implicit_int;
329 /* Nonzero means warn about usage of long long when `-pedantic'. */
331 int warn_long_long = 1;
333 /* Nonzero means message about use of implicit function declarations;
334 1 means warning; 2 means error. */
336 int mesg_implicit_function_declaration = -1;
338 /* Nonzero means give string constants the type `const char *'
339 to get extra warnings from them. These warnings will be too numerous
340 to be useful, except in thoroughly ANSIfied programs. */
342 int flag_const_strings;
344 /* Nonzero means warn about pointer casts that can drop a type qualifier
345 from the pointer target type. */
349 /* Nonzero means warn when casting a function call to a type that does
350 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
351 when there is no previous declaration of sqrt or malloc. */
353 int warn_bad_function_cast;
355 /* Warn about functions which might be candidates for format attributes. */
357 int warn_missing_format_attribute;
359 /* Warn about traditional constructs whose meanings changed in ANSI C. */
361 int warn_traditional;
363 /* Nonzero means warn about sizeof(function) or addition/subtraction
364 of function pointers. */
366 int warn_pointer_arith;
368 /* Nonzero means warn for non-prototype function decls
369 or non-prototyped defs without previous prototype. */
371 int warn_strict_prototypes;
373 /* Nonzero means warn for any global function def
374 without separate previous prototype decl. */
376 int warn_missing_prototypes;
378 /* Nonzero means warn for any global function def
379 without separate previous decl. */
381 int warn_missing_declarations;
383 /* Nonzero means warn about multiple (redundant) decls for the same single
384 variable or function. */
386 int warn_redundant_decls = 0;
388 /* Nonzero means warn about extern declarations of objects not at
389 file-scope level and about *all* declarations of functions (whether
390 extern or static) not at file-scope level. Note that we exclude
391 implicit function declarations. To get warnings about those, use
394 int warn_nested_externs = 0;
396 /* Warn about a subscript that has type char. */
398 int warn_char_subscripts = 0;
400 /* Warn if a type conversion is done that might have confusing results. */
404 /* Warn if adding () is suggested. */
406 int warn_parentheses;
408 /* Warn if initializer is not completely bracketed. */
410 int warn_missing_braces;
412 /* Warn if main is suspicious. */
416 /* Warn about #pragma directives that are not recognised. */
418 int warn_unknown_pragmas = 0; /* Tri state variable. */
420 /* Warn about comparison of signed and unsigned values.
421 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
423 int warn_sign_compare = -1;
425 /* Warn about testing equality of floating point numbers. */
427 int warn_float_equal = 0;
429 /* Nonzero means `$' can be in an identifier. */
431 #ifndef DOLLARS_IN_IDENTIFIERS
432 #define DOLLARS_IN_IDENTIFIERS 1
434 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
436 /* States indicating how grokdeclarator() should handle declspecs marked
437 with __attribute__((deprecated)). An object declared as
438 __attribute__((deprecated)) suppresses warnings of uses of other
441 enum deprecated_states {
446 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
448 /* Decode the string P as a language-specific option for C.
449 Return the number of strings consumed. Should not complain
450 if it does not recognise the option. */
453 c_decode_option (argc, argv)
454 int argc ATTRIBUTE_UNUSED;
457 int strings_processed;
460 static const struct {
461 /* The name of the option. */
463 /* If non-NULL, a flag variable to set to 0 or 1. If NULL,
464 this means that cpp handles this option. */
467 /* This list is in alphabetical order. Keep it like that. */
468 { "bad-function-cast", &warn_bad_function_cast },
469 { "cast-qual", &warn_cast_qual },
470 { "char-subscripts", &warn_char_subscripts },
472 { "comments", NULL },
473 { "conversion", &warn_conversion },
474 { "div-by-zero", &warn_div_by_zero },
475 { "float-equal", &warn_float_equal },
476 { "format-extra-args", &warn_format_extra_args },
477 { "format-nonliteral", &warn_format_nonliteral },
478 { "format-security", &warn_format_security },
479 { "format-y2k", &warn_format_y2k },
480 { "implicit-function-declaration", &mesg_implicit_function_declaration },
481 { "implicit-int", &warn_implicit_int },
483 { "long-long", &warn_long_long },
484 { "main", &warn_main },
485 { "missing-braces", &warn_missing_braces },
486 { "missing-declarations", &warn_missing_declarations },
487 { "missing-format-attribute", &warn_missing_format_attribute },
488 { "missing-prototypes", &warn_missing_prototypes },
489 { "multichar", &warn_multichar },
490 { "nested-externs", &warn_nested_externs },
491 { "parentheses", &warn_parentheses },
492 { "pointer-arith", &warn_pointer_arith },
493 { "redundant-decls", &warn_redundant_decls },
494 { "return-type", &warn_return_type },
495 { "sequence-point", &warn_sequence_point },
496 { "sign-compare", &warn_sign_compare },
497 { "strict-prototypes", &warn_strict_prototypes },
498 { "traditional", &warn_traditional },
499 { "trigraphs", NULL },
501 { "write-strings", &flag_const_strings }
504 strings_processed = cpp_handle_option (parse_in, argc, argv, 0);
506 if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
511 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
515 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
519 else if (!strncmp (p, "-std=", 5))
521 /* Select the appropriate language standard. We currently
523 -std=iso9899:1990 same as -ansi
524 -std=iso9899:199409 ISO C as modified in amend. 1
525 -std=iso9899:1999 ISO C 99
526 -std=c89 same as -std=iso9899:1990
527 -std=c99 same as -std=iso9899:1999
528 -std=gnu89 default, iso9899:1990 + gnu extensions
529 -std=gnu99 iso9899:1999 + gnu extensions
531 const char *const argstart = &p[5];
533 if (!strcmp (argstart, "iso9899:1990")
534 || !strcmp (argstart, "c89"))
539 flag_writable_strings = 0;
541 flag_no_nonansi_builtin = 1;
542 flag_noniso_default_format_attributes = 0;
545 else if (!strcmp (argstart, "iso9899:199409"))
550 else if (!strcmp (argstart, "iso9899:199x")
551 || !strcmp (argstart, "iso9899:1999")
552 || !strcmp (argstart, "c9x")
553 || !strcmp (argstart, "c99"))
555 flag_writable_strings = 0;
557 flag_no_nonansi_builtin = 1;
558 flag_noniso_default_format_attributes = 0;
562 else if (!strcmp (argstart, "gnu89"))
564 flag_writable_strings = 0;
566 flag_no_nonansi_builtin = 0;
567 flag_noniso_default_format_attributes = 1;
571 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
573 flag_writable_strings = 0;
575 flag_no_nonansi_builtin = 0;
576 flag_noniso_default_format_attributes = 1;
580 else if (!strcmp (argstart, "c++98"))
581 ; /* Handled by cpplib. */
583 error ("unknown C standard `%s'", argstart);
585 else if (!strcmp (p, "-fdollars-in-identifiers"))
586 dollars_in_ident = 1;
587 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
588 dollars_in_ident = 0;
589 else if (!strcmp (p, "-fsigned-char"))
590 flag_signed_char = 1;
591 else if (!strcmp (p, "-funsigned-char"))
592 flag_signed_char = 0;
593 else if (!strcmp (p, "-fno-signed-char"))
594 flag_signed_char = 0;
595 else if (!strcmp (p, "-fno-unsigned-char"))
596 flag_signed_char = 1;
597 else if (!strcmp (p, "-fsigned-bitfields")
598 || !strcmp (p, "-fno-unsigned-bitfields"))
600 flag_signed_bitfields = 1;
601 explicit_flag_signed_bitfields = 1;
603 else if (!strcmp (p, "-funsigned-bitfields")
604 || !strcmp (p, "-fno-signed-bitfields"))
606 flag_signed_bitfields = 0;
607 explicit_flag_signed_bitfields = 1;
609 else if (!strcmp (p, "-fshort-enums"))
610 flag_short_enums = 1;
611 else if (!strcmp (p, "-fno-short-enums"))
612 flag_short_enums = 0;
613 else if (!strcmp (p, "-fshort-wchar"))
614 flag_short_wchar = 1;
615 else if (!strcmp (p, "-fno-short-wchar"))
616 flag_short_wchar = 0;
617 else if (!strcmp (p, "-fcond-mismatch"))
618 flag_cond_mismatch = 1;
619 else if (!strcmp (p, "-fno-cond-mismatch"))
620 flag_cond_mismatch = 0;
621 else if (!strcmp (p, "-fshort-double"))
622 flag_short_double = 1;
623 else if (!strcmp (p, "-fno-short-double"))
624 flag_short_double = 0;
625 else if (!strcmp (p, "-fasm"))
627 else if (!strcmp (p, "-fno-asm"))
629 else if (!strcmp (p, "-fbuiltin"))
631 else if (!strcmp (p, "-fno-builtin"))
633 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
634 disable_builtin_function (p + strlen ("-fno-builtin-"));
635 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
637 else if (!strcmp (p, "-ansi"))
639 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
640 mesg_implicit_function_declaration = 2;
641 else if (!strncmp (p, "-Wformat=", 9))
642 set_Wformat (atoi (p + 9));
643 else if (!strcmp (p, "-Wformat"))
645 else if (!strcmp (p, "-Wno-format"))
647 else if (!strcmp (p, "-Wimplicit"))
649 warn_implicit_int = 1;
650 if (mesg_implicit_function_declaration != 2)
651 mesg_implicit_function_declaration = 1;
653 else if (!strcmp (p, "-Wno-implicit"))
654 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
655 else if (!strcmp (p, "-Wno-main"))
657 else if (!strcmp (p, "-Wunknown-pragmas"))
658 /* Set to greater than 1, so that even unknown pragmas in system
659 headers will be warned about. */
660 warn_unknown_pragmas = 2;
661 else if (!strcmp (p, "-Wno-unknown-pragmas"))
662 warn_unknown_pragmas = 0;
663 else if (!strcmp (p, "-Wall"))
665 /* We save the value of warn_uninitialized, since if they put
666 -Wuninitialized on the command line, we need to generate a
667 warning about not using it without also specifying -O. */
668 if (warn_uninitialized != 1)
669 warn_uninitialized = 2;
670 warn_implicit_int = 1;
671 mesg_implicit_function_declaration = 1;
672 warn_return_type = 1;
676 warn_char_subscripts = 1;
677 warn_parentheses = 1;
678 warn_sequence_point = 1;
679 warn_missing_braces = 1;
680 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
681 it off only if it's not explicit. */
683 /* Only warn about unknown pragmas that are not in system headers. */
684 warn_unknown_pragmas = 1;
686 else if (!strcmp (p, "-E"))
687 flag_preprocess_only = 1;
691 for (i = 0; i < sizeof (warn_options) / sizeof (warn_options[0]); i++)
692 if (strncmp (p, "-W", 2) == 0
693 && warn_options[i].flag
694 && (strcmp (p+2, warn_options[i].option) == 0
695 || (strncmp (p+2, "no-", 3) == 0
696 && strcmp (p+5, warn_options[i].option) == 0)))
698 *(warn_options[i].flag) = strncmp (p+2, "no-", 3) != 0;
701 return strings_processed;
708 c_print_identifier (file, node, indent)
713 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
714 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
715 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
716 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
717 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
718 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
719 if (C_IS_RESERVED_WORD (node))
721 tree rid = ridpointers[C_RID_CODE (node)];
722 indent_to (file, indent + 4);
723 fprintf (file, "rid ");
724 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
725 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
729 /* Hook called at end of compilation to assume 1 elt
730 for a top-level tentative array defn that wasn't complete before. */
733 c_finish_incomplete_decl (decl)
736 if (TREE_CODE (decl) == VAR_DECL)
738 tree type = TREE_TYPE (decl);
739 if (type != error_mark_node
740 && TREE_CODE (type) == ARRAY_TYPE
741 && ! DECL_EXTERNAL (decl)
742 && TYPE_DOMAIN (type) == 0)
744 warning_with_decl (decl, "array `%s' assumed to have one element");
746 complete_array_type (type, NULL_TREE, 1);
748 layout_decl (decl, 0);
753 /* Create a new `struct binding_level'. */
755 static struct binding_level *
756 make_binding_level ()
759 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
762 /* Nonzero if we are currently in the global binding level. */
767 return current_binding_level == global_binding_level;
773 keep_next_level_flag = 1;
776 /* Nonzero if the current level needs to have a BLOCK made. */
781 return ((current_binding_level->keep_if_subblocks
782 && current_binding_level->blocks != 0)
783 || current_binding_level->keep
784 || current_binding_level->names != 0
785 || (current_binding_level->tags != 0
786 && !current_binding_level->tag_transparent));
789 /* Identify this binding level as a level of parameters.
790 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
791 But it turns out there is no way to pass the right value for
792 DEFINITION_FLAG, so we ignore it. */
795 declare_parm_level (definition_flag)
796 int definition_flag ATTRIBUTE_UNUSED;
798 current_binding_level->parm_flag = 1;
801 /* Nonzero if currently making parm declarations. */
806 return current_binding_level->parm_flag;
809 /* Enter a new binding level.
810 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
811 not for that of tags. */
814 pushlevel (tag_transparent)
817 struct binding_level *newlevel = NULL_BINDING_LEVEL;
819 /* If this is the top level of a function,
820 just make sure that NAMED_LABELS is 0. */
822 if (current_binding_level == global_binding_level)
827 /* Reuse or create a struct for this binding level. */
829 if (free_binding_level)
831 newlevel = free_binding_level;
832 free_binding_level = free_binding_level->level_chain;
836 newlevel = make_binding_level ();
839 /* Add this level to the front of the chain (stack) of levels that
842 *newlevel = clear_binding_level;
843 newlevel->tag_transparent
845 || (current_binding_level
846 ? current_binding_level->subblocks_tag_transparent
848 newlevel->level_chain = current_binding_level;
849 current_binding_level = newlevel;
850 newlevel->keep = keep_next_level_flag;
851 keep_next_level_flag = 0;
852 newlevel->keep_if_subblocks = keep_next_if_subblocks;
853 keep_next_if_subblocks = 0;
856 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
859 clear_limbo_values (block)
864 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
865 if (DECL_NAME (tem) != 0)
866 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
868 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
869 clear_limbo_values (tem);
872 /* Exit a binding level.
873 Pop the level off, and restore the state of the identifier-decl mappings
874 that were in effect when this level was entered.
876 If KEEP is nonzero, this level had explicit declarations, so
877 and create a "block" (a BLOCK node) for the level
878 to record its declarations and subblocks for symbol table output.
880 If FUNCTIONBODY is nonzero, this level is the body of a function,
881 so create a block as if KEEP were set and also clear out all
884 If REVERSE is nonzero, reverse the order of decls before putting
885 them into the BLOCK. */
888 poplevel (keep, reverse, functionbody)
894 /* The chain of decls was accumulated in reverse order.
895 Put it into forward order, just for cleanliness. */
897 tree tags = current_binding_level->tags;
898 tree subblocks = current_binding_level->blocks;
901 int block_previously_created;
903 keep |= current_binding_level->keep;
905 /* This warning is turned off because it causes warnings for
906 declarations like `extern struct foo *x'. */
908 /* Warn about incomplete structure types in this level. */
909 for (link = tags; link; link = TREE_CHAIN (link))
910 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
912 tree type = TREE_VALUE (link);
913 tree type_name = TYPE_NAME (type);
914 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
916 : DECL_NAME (type_name));
917 switch (TREE_CODE (type))
920 error ("`struct %s' incomplete in scope ending here", id);
923 error ("`union %s' incomplete in scope ending here", id);
926 error ("`enum %s' incomplete in scope ending here", id);
932 /* Get the decls in the order they were written.
933 Usually current_binding_level->names is in reverse order.
934 But parameter decls were previously put in forward order. */
937 current_binding_level->names
938 = decls = nreverse (current_binding_level->names);
940 decls = current_binding_level->names;
942 /* Output any nested inline functions within this block
943 if they weren't already output. */
945 for (decl = decls; decl; decl = TREE_CHAIN (decl))
946 if (TREE_CODE (decl) == FUNCTION_DECL
947 && ! TREE_ASM_WRITTEN (decl)
948 && DECL_INITIAL (decl) != 0
949 && TREE_ADDRESSABLE (decl))
951 /* If this decl was copied from a file-scope decl
952 on account of a block-scope extern decl,
953 propagate TREE_ADDRESSABLE to the file-scope decl.
955 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
956 true, since then the decl goes through save_for_inline_copying. */
957 if (DECL_ABSTRACT_ORIGIN (decl) != 0
958 && DECL_ABSTRACT_ORIGIN (decl) != decl)
959 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
962 /* We used to warn about unused variables in expand_end_bindings,
963 i.e. while generating RTL. But in function-at-a-time mode we may
964 choose to never expand a function at all (e.g. auto inlining), so
965 we do this explicitly now. */
966 warn_about_unused_variables (getdecls ());
968 /* If there were any declarations or structure tags in that level,
969 or if this level is a function body,
970 create a BLOCK to record them for the life of this function. */
973 block_previously_created = (current_binding_level->this_block != 0);
974 if (block_previously_created)
975 block = current_binding_level->this_block;
976 else if (keep || functionbody
977 || (current_binding_level->keep_if_subblocks && subblocks != 0))
978 block = make_node (BLOCK);
981 BLOCK_VARS (block) = decls;
982 BLOCK_SUBBLOCKS (block) = subblocks;
985 /* In each subblock, record that this is its superior. */
987 for (link = subblocks; link; link = TREE_CHAIN (link))
988 BLOCK_SUPERCONTEXT (link) = block;
990 /* Clear out the meanings of the local variables of this level. */
992 for (link = decls; link; link = TREE_CHAIN (link))
994 if (DECL_NAME (link) != 0)
996 /* If the ident. was used or addressed via a local extern decl,
997 don't forget that fact. */
998 if (DECL_EXTERNAL (link))
1000 if (TREE_USED (link))
1001 TREE_USED (DECL_NAME (link)) = 1;
1002 if (TREE_ADDRESSABLE (link))
1003 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1005 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1009 /* Restore all name-meanings of the outer levels
1010 that were shadowed by this level. */
1012 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1013 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1015 /* If the level being exited is the top level of a function,
1016 check over all the labels, and clear out the current
1017 (function local) meanings of their names. */
1021 clear_limbo_values (block);
1023 /* If this is the top level block of a function,
1024 the vars are the function's parameters.
1025 Don't leave them in the BLOCK because they are
1026 found in the FUNCTION_DECL instead. */
1028 BLOCK_VARS (block) = 0;
1030 /* Clear out the definitions of all label names,
1031 since their scopes end here,
1032 and add them to BLOCK_VARS. */
1034 for (link = named_labels; link; link = TREE_CHAIN (link))
1036 tree label = TREE_VALUE (link);
1038 if (DECL_INITIAL (label) == 0)
1040 error_with_decl (label, "label `%s' used but not defined");
1041 /* Avoid crashing later. */
1042 define_label (input_filename, lineno,
1045 else if (warn_unused_label && !TREE_USED (label))
1046 warning_with_decl (label, "label `%s' defined but not used");
1047 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1049 /* Put the labels into the "variables" of the
1050 top-level block, so debugger can see them. */
1051 TREE_CHAIN (label) = BLOCK_VARS (block);
1052 BLOCK_VARS (block) = label;
1056 /* Pop the current level, and free the structure for reuse. */
1059 struct binding_level *level = current_binding_level;
1060 current_binding_level = current_binding_level->level_chain;
1062 level->level_chain = free_binding_level;
1063 free_binding_level = level;
1066 /* Dispose of the block that we just made inside some higher level. */
1068 DECL_INITIAL (current_function_decl) = block;
1071 if (!block_previously_created)
1072 current_binding_level->blocks
1073 = chainon (current_binding_level->blocks, block);
1075 /* If we did not make a block for the level just exited,
1076 any blocks made for inner levels
1077 (since they cannot be recorded as subblocks in that level)
1078 must be carried forward so they will later become subblocks
1079 of something else. */
1081 current_binding_level->blocks
1082 = chainon (current_binding_level->blocks, subblocks);
1084 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1085 binding contour so that they point to the appropriate construct, i.e.
1086 either to the current FUNCTION_DECL node, or else to the BLOCK node
1087 we just constructed.
1089 Note that for tagged types whose scope is just the formal parameter
1090 list for some function type specification, we can't properly set
1091 their TYPE_CONTEXTs here, because we don't have a pointer to the
1092 appropriate FUNCTION_TYPE node readily available to us. For those
1093 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1094 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1095 node which will represent the "scope" for these "parameter list local"
1099 for (link = tags; link; link = TREE_CHAIN (link))
1100 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1102 for (link = tags; link; link = TREE_CHAIN (link))
1103 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1106 TREE_USED (block) = 1;
1111 /* Insert BLOCK at the end of the list of subblocks of the
1112 current binding level. This is used when a BIND_EXPR is expanded,
1113 to handle the BLOCK node inside the BIND_EXPR. */
1116 insert_block (block)
1119 TREE_USED (block) = 1;
1120 current_binding_level->blocks
1121 = chainon (current_binding_level->blocks, block);
1124 /* Set the BLOCK node for the innermost scope
1125 (the one we are currently in). */
1131 current_binding_level->this_block = block;
1132 current_binding_level->names = chainon (current_binding_level->names,
1133 BLOCK_VARS (block));
1134 current_binding_level->blocks = chainon (current_binding_level->blocks,
1135 BLOCK_SUBBLOCKS (block));
1141 struct binding_level *newlevel;
1143 /* Reuse or create a struct for this binding level. */
1145 if (free_binding_level)
1147 newlevel = free_binding_level;
1148 free_binding_level = free_binding_level->level_chain;
1152 newlevel = make_binding_level ();
1155 /* Add this level to the front of the chain (stack) of label levels. */
1157 newlevel->level_chain = label_level_chain;
1158 label_level_chain = newlevel;
1160 newlevel->names = named_labels;
1161 newlevel->shadowed = shadowed_labels;
1163 shadowed_labels = 0;
1169 struct binding_level *level = label_level_chain;
1172 /* Clear out the definitions of the declared labels in this level.
1173 Leave in the list any ordinary, non-declared labels. */
1174 for (link = named_labels, prev = 0; link;)
1176 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1178 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1180 error_with_decl (TREE_VALUE (link),
1181 "label `%s' used but not defined");
1182 /* Avoid crashing later. */
1183 define_label (input_filename, lineno,
1184 DECL_NAME (TREE_VALUE (link)));
1186 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1187 warning_with_decl (TREE_VALUE (link),
1188 "label `%s' defined but not used");
1189 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1191 /* Delete this element from the list. */
1192 link = TREE_CHAIN (link);
1194 TREE_CHAIN (prev) = link;
1196 named_labels = link;
1201 link = TREE_CHAIN (link);
1205 /* Bring back all the labels that were shadowed. */
1206 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1207 if (DECL_NAME (TREE_VALUE (link)) != 0)
1208 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1209 = TREE_VALUE (link);
1211 named_labels = chainon (named_labels, level->names);
1212 shadowed_labels = level->shadowed;
1214 /* Pop the current level, and free the structure for reuse. */
1215 label_level_chain = label_level_chain->level_chain;
1216 level->level_chain = free_binding_level;
1217 free_binding_level = level;
1220 /* Push a definition or a declaration of struct, union or enum tag "name".
1221 "type" should be the type node.
1222 We assume that the tag "name" is not already defined.
1224 Note that the definition may really be just a forward reference.
1225 In that case, the TYPE_SIZE will be zero. */
1228 pushtag (name, type)
1231 struct binding_level *b;
1233 /* Find the proper binding level for this type tag. */
1235 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1240 /* Record the identifier as the type's name if it has none. */
1242 if (TYPE_NAME (type) == 0)
1243 TYPE_NAME (type) = name;
1246 b->tags = tree_cons (name, type, b->tags);
1248 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1249 tagged type we just added to the current binding level. This fake
1250 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1251 to output a representation of a tagged type, and it also gives
1252 us a convenient place to record the "scope start" address for the
1255 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1257 /* An approximation for now, so we can tell this is a function-scope tag.
1258 This will be updated in poplevel. */
1259 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1262 /* Handle when a new declaration NEWDECL
1263 has the same name as an old one OLDDECL
1264 in the same binding contour.
1265 Prints an error message if appropriate.
1267 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1268 Otherwise, return 0.
1270 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1271 and OLDDECL is in an outer binding level and should thus not be changed. */
1274 duplicate_decls (newdecl, olddecl, different_binding_level)
1275 tree newdecl, olddecl;
1276 int different_binding_level;
1278 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1279 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1280 && DECL_INITIAL (newdecl) != 0);
1281 tree oldtype = TREE_TYPE (olddecl);
1282 tree newtype = TREE_TYPE (newdecl);
1285 if (DECL_P (olddecl))
1287 if (TREE_CODE (newdecl) == FUNCTION_DECL
1288 && TREE_CODE (olddecl) == FUNCTION_DECL
1289 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1291 if (DECL_DECLARED_INLINE_P (newdecl)
1292 && DECL_UNINLINABLE (newdecl)
1293 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1294 /* Already warned elsewhere. */;
1295 else if (DECL_DECLARED_INLINE_P (olddecl)
1296 && DECL_UNINLINABLE (olddecl)
1297 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1298 /* Already warned. */;
1299 else if (DECL_DECLARED_INLINE_P (newdecl)
1300 && ! DECL_DECLARED_INLINE_P (olddecl)
1301 && DECL_UNINLINABLE (olddecl)
1302 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1304 warning_with_decl (newdecl,
1305 "function `%s' redeclared as inline");
1306 warning_with_decl (olddecl,
1307 "previous declaration of function `%s' with attribute noinline");
1309 else if (DECL_DECLARED_INLINE_P (olddecl)
1310 && DECL_UNINLINABLE (newdecl)
1311 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1313 warning_with_decl (newdecl,
1314 "function `%s' redeclared with attribute noinline");
1315 warning_with_decl (olddecl,
1316 "previous declaration of function `%s' was inline");
1320 DECL_ATTRIBUTES (newdecl)
1321 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1324 if (TREE_CODE (newtype) == ERROR_MARK
1325 || TREE_CODE (oldtype) == ERROR_MARK)
1328 /* New decl is completely inconsistent with the old one =>
1329 tell caller to replace the old one.
1330 This is always an error except in the case of shadowing a builtin. */
1331 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1333 if (TREE_CODE (olddecl) == FUNCTION_DECL
1334 && (DECL_BUILT_IN (olddecl)
1335 || DECL_BUILT_IN_NONANSI (olddecl)))
1337 /* If you declare a built-in or predefined function name as static,
1338 the old definition is overridden,
1339 but optionally warn this was a bad choice of name. */
1340 if (!TREE_PUBLIC (newdecl))
1344 else if (DECL_BUILT_IN (olddecl))
1345 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1347 warning_with_decl (newdecl, "shadowing library function `%s'");
1349 /* Likewise, if the built-in is not ansi, then programs can
1350 override it even globally without an error. */
1351 else if (! DECL_BUILT_IN (olddecl))
1352 warning_with_decl (newdecl,
1353 "library function `%s' declared as non-function");
1355 else if (DECL_BUILT_IN_NONANSI (olddecl))
1356 warning_with_decl (newdecl,
1357 "built-in function `%s' declared as non-function");
1359 warning_with_decl (newdecl,
1360 "built-in function `%s' declared as non-function");
1364 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1365 error_with_decl (olddecl, "previous declaration of `%s'");
1371 /* For real parm decl following a forward decl,
1372 return 1 so old decl will be reused. */
1373 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1374 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1377 /* The new declaration is the same kind of object as the old one.
1378 The declarations may partially match. Print warnings if they don't
1379 match enough. Ultimately, copy most of the information from the new
1380 decl to the old one, and keep using the old one. */
1382 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
1384 /* A function declaration for a built-in function. */
1385 if (!TREE_PUBLIC (newdecl))
1387 /* If you declare a built-in function name as static, the
1388 built-in definition is overridden,
1389 but optionally warn this was a bad choice of name. */
1391 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1392 /* Discard the old built-in function. */
1395 else if (!types_match)
1397 /* Accept the return type of the new declaration if same modes. */
1398 tree oldreturntype = TREE_TYPE (oldtype);
1399 tree newreturntype = TREE_TYPE (newtype);
1401 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1403 /* Function types may be shared, so we can't just modify
1404 the return type of olddecl's function type. */
1406 = build_function_type (newreturntype,
1407 TYPE_ARG_TYPES (oldtype));
1408 trytype = build_type_attribute_variant (trytype,
1409 TYPE_ATTRIBUTES (oldtype));
1411 types_match = comptypes (newtype, trytype);
1415 /* Accept harmless mismatch in first argument type also.
1416 This is for the ffs and fprintf builtins. */
1417 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1418 && TYPE_ARG_TYPES (oldtype) != 0
1419 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1420 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1421 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1422 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1424 /* Function types may be shared, so we can't just modify
1425 the return type of olddecl's function type. */
1427 = build_function_type (TREE_TYPE (oldtype),
1428 tree_cons (NULL_TREE,
1429 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1430 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1431 trytype = build_type_attribute_variant (trytype,
1432 TYPE_ATTRIBUTES (oldtype));
1434 types_match = comptypes (newtype, trytype);
1438 if (! different_binding_level)
1439 TREE_TYPE (olddecl) = oldtype;
1441 else if (TYPE_ARG_TYPES (oldtype) == NULL
1442 && TYPE_ARG_TYPES (newtype) != NULL)
1444 /* For bcmp, bzero, fputs the builtin type has arguments not
1445 specified. Use the ones from the prototype so that type checking
1446 is done for them. */
1448 = build_function_type (TREE_TYPE (oldtype),
1449 TYPE_ARG_TYPES (newtype));
1450 trytype = build_type_attribute_variant (trytype,
1451 TYPE_ATTRIBUTES (oldtype));
1454 if (! different_binding_level)
1455 TREE_TYPE (olddecl) = oldtype;
1459 /* If types don't match for a built-in, throw away the built-in. */
1460 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1464 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1465 && DECL_SOURCE_LINE (olddecl) == 0)
1467 /* A function declaration for a predeclared function
1468 that isn't actually built in. */
1469 if (!TREE_PUBLIC (newdecl))
1471 /* If you declare it as static, the
1472 default definition is overridden. */
1475 else if (!types_match)
1477 /* If the types don't match, preserve volatility indication.
1478 Later on, we will discard everything else about the
1479 default declaration. */
1480 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1483 /* Permit char *foo () to match void *foo (...) if not pedantic,
1484 if one of them came from a system header file. */
1485 else if (!types_match
1486 && TREE_CODE (olddecl) == FUNCTION_DECL
1487 && TREE_CODE (newdecl) == FUNCTION_DECL
1488 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1489 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1490 && (DECL_IN_SYSTEM_HEADER (olddecl)
1491 || DECL_IN_SYSTEM_HEADER (newdecl))
1492 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1493 && TYPE_ARG_TYPES (oldtype) == 0
1494 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1495 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1497 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1498 && TYPE_ARG_TYPES (newtype) == 0
1499 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1500 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1503 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1504 /* Make sure we keep void * as ret type, not char *. */
1505 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1506 TREE_TYPE (newdecl) = newtype = oldtype;
1508 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1509 we will come back here again. */
1510 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1512 else if (!types_match
1513 /* Permit char *foo (int, ...); followed by char *foo ();
1515 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1517 /* Return types must still match. */
1518 && comptypes (TREE_TYPE (oldtype),
1519 TREE_TYPE (newtype))
1520 && TYPE_ARG_TYPES (newtype) == 0))
1522 error_with_decl (newdecl, "conflicting types for `%s'");
1523 /* Check for function type mismatch
1524 involving an empty arglist vs a nonempty one. */
1525 if (TREE_CODE (olddecl) == FUNCTION_DECL
1526 && comptypes (TREE_TYPE (oldtype),
1527 TREE_TYPE (newtype))
1528 && ((TYPE_ARG_TYPES (oldtype) == 0
1529 && DECL_INITIAL (olddecl) == 0)
1531 (TYPE_ARG_TYPES (newtype) == 0
1532 && DECL_INITIAL (newdecl) == 0)))
1534 /* Classify the problem further. */
1535 tree t = TYPE_ARG_TYPES (oldtype);
1537 t = TYPE_ARG_TYPES (newtype);
1538 for (; t; t = TREE_CHAIN (t))
1540 tree type = TREE_VALUE (t);
1542 if (TREE_CHAIN (t) == 0
1543 && TYPE_MAIN_VARIANT (type) != void_type_node)
1545 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1549 if (c_type_promotes_to (type) != type)
1551 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1556 error_with_decl (olddecl, "previous declaration of `%s'");
1560 errmsg = redeclaration_error_message (newdecl, olddecl);
1566 error_with_decl (newdecl, "redefinition of `%s'");
1569 error_with_decl (newdecl, "redeclaration of `%s'");
1572 error_with_decl (newdecl, "conflicting declarations of `%s'");
1578 error_with_decl (olddecl,
1579 ((DECL_INITIAL (olddecl)
1580 && current_binding_level == global_binding_level)
1581 ? "`%s' previously defined here"
1582 : "`%s' previously declared here"));
1585 else if (TREE_CODE (newdecl) == TYPE_DECL
1586 && (DECL_IN_SYSTEM_HEADER (olddecl)
1587 || DECL_IN_SYSTEM_HEADER (newdecl)))
1589 warning_with_decl (newdecl, "redefinition of `%s'");
1592 ((DECL_INITIAL (olddecl)
1593 && current_binding_level == global_binding_level)
1594 ? "`%s' previously defined here"
1595 : "`%s' previously declared here"));
1597 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1598 && DECL_INITIAL (olddecl) != 0
1599 && TYPE_ARG_TYPES (oldtype) == 0
1600 && TYPE_ARG_TYPES (newtype) != 0
1601 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1605 /* Prototype decl follows defn w/o prototype. */
1607 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1608 type = TYPE_ARG_TYPES (newtype),
1611 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1613 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1614 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1616 warning_with_decl (newdecl, "prototype for `%s' follows");
1617 warning_with_decl (olddecl, "non-prototype definition here");
1620 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1621 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1623 error_with_decl (newdecl,
1624 "prototype for `%s' follows and number of arguments doesn't match");
1625 error_with_decl (olddecl, "non-prototype definition here");
1629 /* Type for passing arg must be consistent
1630 with that declared for the arg. */
1631 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1633 error_with_decl (newdecl,
1634 "prototype for `%s' follows and argument %d doesn't match",
1636 error_with_decl (olddecl, "non-prototype definition here");
1642 /* Warn about mismatches in various flags. */
1645 /* Warn if function is now inline
1646 but was previously declared not inline and has been called. */
1647 if (TREE_CODE (olddecl) == FUNCTION_DECL
1648 && ! DECL_DECLARED_INLINE_P (olddecl)
1649 && DECL_DECLARED_INLINE_P (newdecl)
1650 && TREE_USED (olddecl))
1651 warning_with_decl (newdecl,
1652 "`%s' declared inline after being called");
1653 if (TREE_CODE (olddecl) == FUNCTION_DECL
1654 && ! DECL_DECLARED_INLINE_P (olddecl)
1655 && DECL_DECLARED_INLINE_P (newdecl)
1656 && DECL_INITIAL (olddecl) != 0)
1657 warning_with_decl (newdecl,
1658 "`%s' declared inline after its definition");
1660 /* If pedantic, warn when static declaration follows a non-static
1661 declaration. Otherwise, do so only for functions. */
1662 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1663 && TREE_PUBLIC (olddecl)
1664 && !TREE_PUBLIC (newdecl))
1665 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1667 /* If warn_traditional, warn when a non-static function
1668 declaration follows a static one. */
1669 if (warn_traditional && !in_system_header
1670 && TREE_CODE (olddecl) == FUNCTION_DECL
1671 && !TREE_PUBLIC (olddecl)
1672 && TREE_PUBLIC (newdecl))
1673 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1675 /* Warn when const declaration follows a non-const
1676 declaration, but not for functions. */
1677 if (TREE_CODE (olddecl) != FUNCTION_DECL
1678 && !TREE_READONLY (olddecl)
1679 && TREE_READONLY (newdecl))
1680 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1681 /* These bits are logically part of the type, for variables.
1682 But not for functions
1683 (where qualifiers are not valid ANSI anyway). */
1684 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1685 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1686 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1687 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1691 /* Optionally warn about more than one declaration for the same name. */
1692 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1693 /* Don't warn about a function declaration
1694 followed by a definition. */
1695 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1696 && DECL_INITIAL (olddecl) == 0)
1697 /* Don't warn about extern decl followed by (tentative) definition. */
1698 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1700 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1701 warning_with_decl (olddecl, "previous declaration of `%s'");
1704 /* Copy all the DECL_... slots specified in the new decl
1705 except for any that we copy here from the old type.
1707 Past this point, we don't change OLDTYPE and NEWTYPE
1708 even if we change the types of NEWDECL and OLDDECL. */
1712 /* When copying info to olddecl, we store into write_olddecl
1713 instead. This allows us to avoid modifying olddecl when
1714 different_binding_level is true. */
1715 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1717 /* Merge the data types specified in the two decls. */
1718 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1720 if (different_binding_level)
1722 if (TYPE_ARG_TYPES (oldtype) != 0
1723 && TYPE_ARG_TYPES (newtype) == 0)
1724 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1727 = build_type_attribute_variant
1729 merge_attributes (TYPE_ATTRIBUTES (newtype),
1730 TYPE_ATTRIBUTES (oldtype)));
1734 = TREE_TYPE (olddecl)
1735 = common_type (newtype, oldtype);
1738 /* Lay the type out, unless already done. */
1739 if (oldtype != TREE_TYPE (newdecl))
1741 if (TREE_TYPE (newdecl) != error_mark_node)
1742 layout_type (TREE_TYPE (newdecl));
1743 if (TREE_CODE (newdecl) != FUNCTION_DECL
1744 && TREE_CODE (newdecl) != TYPE_DECL
1745 && TREE_CODE (newdecl) != CONST_DECL)
1746 layout_decl (newdecl, 0);
1750 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1751 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1752 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1753 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1754 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1755 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1757 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1758 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1762 /* Keep the old rtl since we can safely use it. */
1763 COPY_DECL_RTL (olddecl, newdecl);
1765 /* Merge the type qualifiers. */
1766 if (TREE_CODE (olddecl) == FUNCTION_DECL
1767 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1768 && ! TREE_THIS_VOLATILE (newdecl))
1769 TREE_THIS_VOLATILE (write_olddecl) = 0;
1771 if (TREE_READONLY (newdecl))
1772 TREE_READONLY (write_olddecl) = 1;
1774 if (TREE_THIS_VOLATILE (newdecl))
1776 TREE_THIS_VOLATILE (write_olddecl) = 1;
1777 if (TREE_CODE (newdecl) == VAR_DECL
1778 /* If an automatic variable is re-declared in the same
1779 function scope, but the old declaration was not
1780 volatile, make_var_volatile() would crash because the
1781 variable would have been assigned to a pseudo, not a
1782 MEM. Since this duplicate declaration is invalid
1783 anyway, we just skip the call. */
1785 make_var_volatile (newdecl);
1788 /* Keep source location of definition rather than declaration. */
1789 /* When called with different_binding_level set, keep the old
1790 information so that meaningful diagnostics can be given. */
1791 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1792 && ! different_binding_level)
1794 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1795 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1798 /* Merge the unused-warning information. */
1799 if (DECL_IN_SYSTEM_HEADER (olddecl))
1800 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1801 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1802 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1804 /* Merge the initialization information. */
1805 /* When called with different_binding_level set, don't copy over
1806 DECL_INITIAL, so that we don't accidentally change function
1807 declarations into function definitions. */
1808 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1809 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1811 /* Merge the section attribute.
1812 We want to issue an error if the sections conflict but that must be
1813 done later in decl_attributes since we are called before attributes
1815 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1816 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1818 /* Copy the assembler name.
1819 Currently, it can only be defined in the prototype. */
1820 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1822 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1824 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1825 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1826 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1827 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1828 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1831 /* If cannot merge, then use the new type and qualifiers,
1832 and don't preserve the old rtl. */
1833 else if (! different_binding_level)
1835 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1836 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1837 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1838 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1841 /* Merge the storage class information. */
1842 merge_weak (newdecl, olddecl);
1844 /* For functions, static overrides non-static. */
1845 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1848 /* This is since we don't automatically
1849 copy the attributes of NEWDECL into OLDDECL. */
1850 /* No need to worry about different_binding_level here because
1851 then TREE_PUBLIC (newdecl) was true. */
1852 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1853 /* If this clears `static', clear it in the identifier too. */
1854 if (! TREE_PUBLIC (olddecl))
1855 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1857 if (DECL_EXTERNAL (newdecl))
1859 if (! different_binding_level)
1861 /* Don't mess with these flags on local externs; they remain
1862 external even if there's a declaration at file scope which
1864 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1865 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1867 /* An extern decl does not override previous storage class. */
1868 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1869 if (! DECL_EXTERNAL (newdecl))
1870 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1874 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1875 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 /* If we're redefining a function previously defined as extern
1881 inline, make sure we emit debug info for the inline before we
1882 throw it away, in case it was inlined into a function that hasn't
1883 been written out yet. */
1884 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1886 (*debug_hooks->outlining_inline_function) (olddecl);
1888 /* The new defn must not be inline. */
1889 DECL_INLINE (newdecl) = 0;
1890 DECL_UNINLINABLE (newdecl) = 1;
1894 /* If either decl says `inline', this fn is inline,
1895 unless its definition was passed already. */
1896 if (DECL_DECLARED_INLINE_P (newdecl)
1897 || DECL_DECLARED_INLINE_P (olddecl))
1898 DECL_DECLARED_INLINE_P (newdecl) = 1;
1900 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1901 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1904 if (DECL_BUILT_IN (olddecl))
1906 /* Get rid of any built-in function if new arg types don't match it
1907 or if we have a function definition. */
1908 if (! types_match || new_is_definition)
1910 if (! different_binding_level)
1912 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1913 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1918 /* If redeclaring a builtin function, and not a definition,
1919 it stays built in. */
1920 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1921 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1925 /* Also preserve various other info from the definition. */
1926 if (! new_is_definition)
1928 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1929 /* When called with different_binding_level set, don't copy over
1930 DECL_INITIAL, so that we don't accidentally change function
1931 declarations into function definitions. */
1932 if (! different_binding_level)
1933 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1934 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1935 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1936 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1937 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1939 /* Set DECL_INLINE on the declaration if we've got a body
1940 from which to instantiate. */
1941 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1943 DECL_INLINE (newdecl) = 1;
1944 DECL_ABSTRACT_ORIGIN (newdecl)
1945 = (different_binding_level
1946 ? DECL_ORIGIN (olddecl)
1947 : DECL_ABSTRACT_ORIGIN (olddecl));
1952 /* If a previous declaration said inline, mark the
1953 definition as inlinable. */
1954 if (DECL_DECLARED_INLINE_P (newdecl)
1955 && ! DECL_UNINLINABLE (newdecl))
1956 DECL_INLINE (newdecl) = 1;
1959 if (different_binding_level)
1962 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1963 But preserve OLDDECL's DECL_UID. */
1965 unsigned olddecl_uid = DECL_UID (olddecl);
1967 memcpy ((char *) olddecl + sizeof (struct tree_common),
1968 (char *) newdecl + sizeof (struct tree_common),
1969 sizeof (struct tree_decl) - sizeof (struct tree_common));
1970 DECL_UID (olddecl) = olddecl_uid;
1973 /* NEWDECL contains the merged attribute lists.
1974 Update OLDDECL to be the same. */
1975 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1980 /* Check whether decl-node X shadows an existing declaration.
1981 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1982 which might be a NULL_TREE. */
1984 warn_if_shadowing (x, oldlocal)
1989 if (DECL_EXTERNAL (x))
1992 name = DECL_NAME (x);
1994 /* Warn if shadowing an argument at the top level of the body. */
1996 /* This warning doesn't apply to the parms of a nested fcn. */
1997 && ! current_binding_level->parm_flag
1998 /* Check that this is one level down from the parms. */
1999 && current_binding_level->level_chain->parm_flag
2000 /* Check that the decl being shadowed
2001 comes from the parm level, one level up. */
2002 && chain_member (oldlocal, current_binding_level->level_chain->names))
2004 if (TREE_CODE (oldlocal) == PARM_DECL)
2005 pedwarn ("declaration of `%s' shadows a parameter",
2006 IDENTIFIER_POINTER (name));
2008 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2009 IDENTIFIER_POINTER (name));
2011 /* Maybe warn if shadowing something else. */
2012 else if (warn_shadow
2013 /* No shadow warnings for internally generated vars. */
2014 && DECL_SOURCE_LINE (x) != 0
2015 /* No shadow warnings for vars made for inlining. */
2016 && ! DECL_FROM_INLINE (x))
2018 if (TREE_CODE (x) == PARM_DECL
2019 && current_binding_level->level_chain->parm_flag)
2020 /* Don't warn about the parm names in function declarator
2021 within a function declarator.
2022 It would be nice to avoid warning in any function
2023 declarator in a declaration, as opposed to a definition,
2024 but there is no way to tell it's not a definition. */
2028 if (TREE_CODE (oldlocal) == PARM_DECL)
2029 shadow_warning ("a parameter", name, oldlocal);
2031 shadow_warning ("a previous local", name, oldlocal);
2033 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2034 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2035 shadow_warning ("a global declaration", name,
2036 IDENTIFIER_GLOBAL_VALUE (name));
2040 /* Record a decl-node X as belonging to the current lexical scope.
2041 Check for errors (such as an incompatible declaration for the same
2042 name already seen in the same scope).
2044 Returns either X or an old decl for the same name.
2045 If an old decl is returned, it may have been smashed
2046 to agree with what X says. */
2053 tree name = DECL_NAME (x);
2054 struct binding_level *b = current_binding_level;
2056 /* Functions need the lang_decl data. */
2057 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2058 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2059 ggc_alloc_cleared (sizeof (struct lang_decl));
2061 DECL_CONTEXT (x) = current_function_decl;
2062 /* A local extern declaration for a function doesn't constitute nesting.
2063 A local auto declaration does, since it's a forward decl
2064 for a nested function coming later. */
2065 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2066 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2067 DECL_CONTEXT (x) = 0;
2071 int different_binding_level = 0;
2073 if (warn_nested_externs
2074 && DECL_EXTERNAL (x)
2075 && b != global_binding_level
2076 && x != IDENTIFIER_IMPLICIT_DECL (name)
2077 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2078 && !DECL_IN_SYSTEM_HEADER (x))
2079 warning ("nested extern declaration of `%s'",
2080 IDENTIFIER_POINTER (name));
2082 t = lookup_name_current_level (name);
2083 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2085 t = IDENTIFIER_GLOBAL_VALUE (name);
2086 /* Type decls at global scope don't conflict with externs declared
2087 inside lexical blocks. */
2088 if (! t || TREE_CODE (t) == TYPE_DECL)
2089 /* If there's no visible global declaration, try for an
2091 t = IDENTIFIER_LIMBO_VALUE (name);
2092 different_binding_level = 1;
2094 if (t != 0 && t == error_mark_node)
2095 /* error_mark_node is 0 for a while during initialization! */
2098 error_with_decl (x, "`%s' used prior to declaration");
2101 /* If this decl is `static' and an implicit decl was seen previously,
2103 if (TREE_PUBLIC (name)
2104 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2105 sets this for all functions. */
2106 && ! TREE_PUBLIC (x)
2107 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2108 /* We used to warn also for explicit extern followed by static,
2109 but sometimes you need to do it that way. */
2110 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2112 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2113 IDENTIFIER_POINTER (name));
2114 pedwarn_with_file_and_line
2115 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2116 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2117 "previous declaration of `%s'",
2118 IDENTIFIER_POINTER (name));
2119 TREE_THIS_VOLATILE (name) = 1;
2122 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2124 if (TREE_CODE (t) == PARM_DECL)
2126 /* Don't allow more than one "real" duplicate
2127 of a forward parm decl. */
2128 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2134 /* If we are processing a typedef statement, generate a whole new
2135 ..._TYPE node (which will be just an variant of the existing
2136 ..._TYPE node with identical properties) and then install the
2137 TYPE_DECL node generated to represent the typedef name as the
2138 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2140 The whole point here is to end up with a situation where each
2141 and every ..._TYPE node the compiler creates will be uniquely
2142 associated with AT MOST one node representing a typedef name.
2143 This way, even though the compiler substitutes corresponding
2144 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2145 early on, later parts of the compiler can always do the reverse
2146 translation and get back the corresponding typedef name. For
2149 typedef struct S MY_TYPE;
2152 Later parts of the compiler might only know that `object' was of
2153 type `struct S' if it were not for code just below. With this
2154 code however, later parts of the compiler see something like:
2156 struct S' == struct S
2157 typedef struct S' MY_TYPE;
2160 And they can then deduce (from the node for type struct S') that
2161 the original object declaration was:
2165 Being able to do this is important for proper support of protoize,
2166 and also for generating precise symbolic debugging information
2167 which takes full account of the programmer's (typedef) vocabulary.
2169 Obviously, we don't want to generate a duplicate ..._TYPE node if
2170 the TYPE_DECL node that we are now processing really represents a
2171 standard built-in type.
2173 Since all standard types are effectively declared at line zero
2174 in the source file, we can easily check to see if we are working
2175 on a standard type by checking the current value of lineno. */
2177 if (TREE_CODE (x) == TYPE_DECL)
2179 if (DECL_SOURCE_LINE (x) == 0)
2181 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2182 TYPE_NAME (TREE_TYPE (x)) = x;
2184 else if (TREE_TYPE (x) != error_mark_node
2185 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2187 tree tt = TREE_TYPE (x);
2188 DECL_ORIGINAL_TYPE (x) = tt;
2189 tt = build_type_copy (tt);
2191 TREE_USED (tt) = TREE_USED (x);
2196 /* Multiple external decls of the same identifier ought to match.
2197 We get warnings about inline functions where they are defined.
2198 Avoid duplicate warnings where they are used. */
2200 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2204 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2205 /* Decls in limbo are always extern, so no need to check that. */
2206 decl = IDENTIFIER_LIMBO_VALUE (name);
2210 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2211 /* If old decl is built-in, we already warned if we should. */
2212 && !DECL_BUILT_IN (decl))
2214 pedwarn_with_decl (x,
2215 "type mismatch with previous external decl");
2216 pedwarn_with_decl (decl, "previous external decl of `%s'");
2220 /* If a function has had an implicit declaration, and then is defined,
2221 make sure they are compatible. */
2223 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2224 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2225 && TREE_CODE (x) == FUNCTION_DECL
2226 && ! comptypes (TREE_TYPE (x),
2227 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2229 warning_with_decl (x, "type mismatch with previous implicit declaration");
2230 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2231 "previous implicit declaration of `%s'");
2234 /* This name is new in its binding level.
2235 Install the new declaration and return it. */
2236 if (b == global_binding_level)
2238 /* Install a global value. */
2240 /* If the first global decl has external linkage,
2241 warn if we later see static one. */
2242 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2243 TREE_PUBLIC (name) = 1;
2245 IDENTIFIER_GLOBAL_VALUE (name) = x;
2247 /* We no longer care about any previous block level declarations. */
2248 IDENTIFIER_LIMBO_VALUE (name) = 0;
2250 /* Don't forget if the function was used via an implicit decl. */
2251 if (IDENTIFIER_IMPLICIT_DECL (name)
2252 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2253 TREE_USED (x) = 1, TREE_USED (name) = 1;
2255 /* Don't forget if its address was taken in that way. */
2256 if (IDENTIFIER_IMPLICIT_DECL (name)
2257 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2258 TREE_ADDRESSABLE (x) = 1;
2260 /* Warn about mismatches against previous implicit decl. */
2261 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2262 /* If this real decl matches the implicit, don't complain. */
2263 && ! (TREE_CODE (x) == FUNCTION_DECL
2264 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2265 == integer_type_node)))
2266 pedwarn ("`%s' was previously implicitly declared to return `int'",
2267 IDENTIFIER_POINTER (name));
2269 /* If this decl is `static' and an `extern' was seen previously,
2270 that is erroneous. */
2271 if (TREE_PUBLIC (name)
2272 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2274 /* Okay to redeclare an ANSI built-in as static. */
2275 if (t != 0 && DECL_BUILT_IN (t))
2277 /* Okay to declare a non-ANSI built-in as anything. */
2278 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2280 /* Okay to have global type decl after an earlier extern
2281 declaration inside a lexical block. */
2282 else if (TREE_CODE (x) == TYPE_DECL)
2284 else if (IDENTIFIER_IMPLICIT_DECL (name))
2286 if (! TREE_THIS_VOLATILE (name))
2287 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2288 IDENTIFIER_POINTER (name));
2291 pedwarn ("`%s' was declared `extern' and later `static'",
2292 IDENTIFIER_POINTER (name));
2297 /* Here to install a non-global value. */
2298 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2299 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2301 IDENTIFIER_LOCAL_VALUE (name) = x;
2303 /* If this is an extern function declaration, see if we
2304 have a global definition or declaration for the function. */
2307 && TREE_CODE (x) == FUNCTION_DECL
2308 && TREE_CODE (oldglobal) == FUNCTION_DECL
2309 && DECL_EXTERNAL (x)
2310 && ! DECL_DECLARED_INLINE_P (x))
2312 /* We have one. Their types must agree. */
2313 if (! comptypes (TREE_TYPE (x),
2314 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2315 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2318 /* Inner extern decl is inline if global one is.
2319 Copy enough to really inline it. */
2320 if (DECL_DECLARED_INLINE_P (oldglobal))
2322 DECL_DECLARED_INLINE_P (x)
2323 = DECL_DECLARED_INLINE_P (oldglobal);
2324 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2325 DECL_INITIAL (x) = (current_function_decl == oldglobal
2326 ? 0 : DECL_INITIAL (oldglobal));
2327 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2328 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2329 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2330 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2331 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2332 DECL_ABSTRACT_ORIGIN (x)
2333 = DECL_ABSTRACT_ORIGIN (oldglobal);
2335 /* Inner extern decl is built-in if global one is. */
2336 if (DECL_BUILT_IN (oldglobal))
2338 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2339 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2341 /* Keep the arg types from a file-scope fcn defn. */
2342 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2343 && DECL_INITIAL (oldglobal)
2344 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2345 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2350 /* This case is probably sometimes the right thing to do. */
2351 /* If we have a local external declaration,
2352 then any file-scope declaration should not
2353 have been static. */
2354 if (oldlocal == 0 && oldglobal != 0
2355 && !TREE_PUBLIC (oldglobal)
2356 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2357 warning ("`%s' locally external but globally static",
2358 IDENTIFIER_POINTER (name));
2361 /* If we have a local external declaration,
2362 and no file-scope declaration has yet been seen,
2363 then if we later have a file-scope decl it must not be static. */
2365 && DECL_EXTERNAL (x)
2369 TREE_PUBLIC (name) = 1;
2371 /* Save this decl, so that we can do type checking against
2372 other decls after it falls out of scope.
2374 Only save it once. This prevents temporary decls created in
2375 expand_inline_function from being used here, since this
2376 will have been set when the inline function was parsed.
2377 It also helps give slightly better warnings. */
2378 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2379 IDENTIFIER_LIMBO_VALUE (name) = x;
2382 warn_if_shadowing (x, oldlocal);
2384 /* If storing a local value, there may already be one (inherited).
2385 If so, record it for restoration when this binding level ends. */
2387 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2390 /* Keep count of variables in this level with incomplete type.
2391 If the input is erroneous, we can have error_mark in the type
2392 slot (e.g. "f(void a, ...)") - that doesn't count as an
2394 if (TREE_TYPE (x) != error_mark_node
2395 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2397 tree element = TREE_TYPE (x);
2399 while (TREE_CODE (element) == ARRAY_TYPE)
2400 element = TREE_TYPE (element);
2401 if (TREE_CODE (element) == RECORD_TYPE
2402 || TREE_CODE (element) == UNION_TYPE)
2407 /* Put decls on list in reverse order.
2408 We will reverse them later if necessary. */
2409 TREE_CHAIN (x) = b->names;
2415 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2418 pushdecl_top_level (x)
2422 struct binding_level *b = current_binding_level;
2424 current_binding_level = global_binding_level;
2426 current_binding_level = b;
2430 /* Generate an implicit declaration for identifier FUNCTIONID
2431 as a function of type int (). Print a warning if appropriate. */
2434 implicitly_declare (functionid)
2438 int traditional_warning = 0;
2439 /* Only one "implicit declaration" warning per identifier. */
2440 int implicit_warning;
2442 /* We used to reuse an old implicit decl here,
2443 but this loses with inline functions because it can clobber
2444 the saved decl chains. */
2446 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2447 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2450 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2452 /* Warn of implicit decl following explicit local extern decl.
2453 This is probably a program designed for traditional C. */
2454 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2455 traditional_warning = 1;
2457 /* Warn once of an implicit declaration. */
2458 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2460 DECL_EXTERNAL (decl) = 1;
2461 TREE_PUBLIC (decl) = 1;
2463 /* Record that we have an implicit decl and this is it. */
2464 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2466 /* ANSI standard says implicit declarations are in the innermost block.
2467 So we record the decl in the standard fashion. */
2470 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2471 maybe_objc_check_decl (decl);
2473 rest_of_decl_compilation (decl, NULL, 0, 0);
2475 if (implicit_warning)
2476 implicit_decl_warning (functionid);
2477 else if (warn_traditional && traditional_warning)
2478 warning ("function `%s' was previously declared within a block",
2479 IDENTIFIER_POINTER (functionid));
2481 /* Write a record describing this implicit function declaration to the
2482 prototypes file (if requested). */
2484 gen_aux_info_record (decl, 0, 1, 0);
2486 /* Possibly apply some default attributes to this implicit declaration. */
2487 decl_attributes (&decl, NULL_TREE, 0);
2493 implicit_decl_warning (id)
2496 const char *name = IDENTIFIER_POINTER (id);
2497 if (mesg_implicit_function_declaration == 2)
2498 error ("implicit declaration of function `%s'", name);
2499 else if (mesg_implicit_function_declaration == 1)
2500 warning ("implicit declaration of function `%s'", name);
2503 /* Return zero if the declaration NEWDECL is valid
2504 when the declaration OLDDECL (assumed to be for the same name)
2505 has already been seen.
2506 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2507 and 3 if it is a conflicting declaration. */
2510 redeclaration_error_message (newdecl, olddecl)
2511 tree newdecl, olddecl;
2513 if (TREE_CODE (newdecl) == TYPE_DECL)
2515 /* Do not complain about type redeclarations where at least one
2516 declaration was in a system header. */
2517 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2521 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2523 /* Declarations of functions can insist on internal linkage
2524 but they can't be inconsistent with internal linkage,
2525 so there can be no error on that account.
2526 However defining the same name twice is no good. */
2527 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2528 /* However, defining once as extern inline and a second
2529 time in another way is ok. */
2530 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2531 && ! (DECL_DECLARED_INLINE_P (newdecl)
2532 && DECL_EXTERNAL (newdecl))))
2536 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2538 /* Objects declared at top level: */
2539 /* If at least one is a reference, it's ok. */
2540 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2542 /* Reject two definitions. */
2543 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2545 /* Now we have two tentative defs, or one tentative and one real def. */
2546 /* Insist that the linkage match. */
2547 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2551 else if (current_binding_level->parm_flag
2552 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2556 /* Newdecl has block scope. If olddecl has block scope also, then
2557 reject two definitions, and reject a definition together with an
2558 external reference. Otherwise, it is OK, because newdecl must
2559 be an extern reference to olddecl. */
2560 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2561 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2567 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2568 Create one if none exists so far for the current function.
2569 This function is called for both label definitions and label references. */
2575 tree decl = IDENTIFIER_LABEL_VALUE (id);
2577 if (current_function_decl == 0)
2579 error ("label %s referenced outside of any function",
2580 IDENTIFIER_POINTER (id));
2584 /* Use a label already defined or ref'd with this name. */
2587 /* But not if it is inherited and wasn't declared to be inheritable. */
2588 if (DECL_CONTEXT (decl) != current_function_decl
2589 && ! C_DECLARED_LABEL_FLAG (decl))
2590 return shadow_label (id);
2594 decl = build_decl (LABEL_DECL, id, void_type_node);
2596 /* A label not explicitly declared must be local to where it's ref'd. */
2597 DECL_CONTEXT (decl) = current_function_decl;
2599 DECL_MODE (decl) = VOIDmode;
2601 /* Say where one reference is to the label,
2602 for the sake of the error if it is not defined. */
2603 DECL_SOURCE_LINE (decl) = lineno;
2604 DECL_SOURCE_FILE (decl) = input_filename;
2606 IDENTIFIER_LABEL_VALUE (id) = decl;
2608 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2613 /* Make a label named NAME in the current function,
2614 shadowing silently any that may be inherited from containing functions
2615 or containing scopes.
2617 Note that valid use, if the label being shadowed
2618 comes from another scope in the same function,
2619 requires calling declare_nonlocal_label right away. */
2625 tree decl = IDENTIFIER_LABEL_VALUE (name);
2631 /* Check to make sure that the label hasn't already been declared
2632 at this label scope */
2633 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2634 if (TREE_VALUE (dup) == decl)
2636 error ("duplicate label declaration `%s'",
2637 IDENTIFIER_POINTER (name));
2638 error_with_decl (TREE_VALUE (dup),
2639 "this is a previous declaration");
2640 /* Just use the previous declaration. */
2641 return lookup_label (name);
2644 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2645 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2648 return lookup_label (name);
2651 /* Define a label, specifying the location in the source file.
2652 Return the LABEL_DECL node for the label, if the definition is valid.
2653 Otherwise return 0. */
2656 define_label (filename, line, name)
2657 const char *filename;
2661 tree decl = lookup_label (name);
2663 /* If label with this name is known from an outer context, shadow it. */
2664 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2666 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2667 IDENTIFIER_LABEL_VALUE (name) = 0;
2668 decl = lookup_label (name);
2671 if (warn_traditional && !in_system_header && lookup_name (name))
2672 warning_with_file_and_line (filename, line,
2673 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2674 IDENTIFIER_POINTER (name));
2676 if (DECL_INITIAL (decl) != 0)
2678 error_with_file_and_line (filename, line, "duplicate label `%s'",
2679 IDENTIFIER_POINTER (name));
2684 /* Mark label as having been defined. */
2685 DECL_INITIAL (decl) = error_mark_node;
2686 /* Say where in the source. */
2687 DECL_SOURCE_FILE (decl) = filename;
2688 DECL_SOURCE_LINE (decl) = line;
2693 /* Return the list of declarations of the current level.
2694 Note that this list is in reverse order unless/until
2695 you nreverse it; and when you do nreverse it, you must
2696 store the result back using `storedecls' or you will lose. */
2701 return current_binding_level->names;
2704 /* Return the list of type-tags (for structs, etc) of the current level. */
2709 return current_binding_level->tags;
2712 /* Store the list of declarations of the current level.
2713 This is done for the parameter declarations of a function being defined,
2714 after they are modified in the light of any missing parameters. */
2720 current_binding_level->names = decls;
2723 /* Similarly, store the list of tags of the current level. */
2729 current_binding_level->tags = tags;
2732 /* Given NAME, an IDENTIFIER_NODE,
2733 return the structure (or union or enum) definition for that name.
2734 Searches binding levels from BINDING_LEVEL up to the global level.
2735 If THISLEVEL_ONLY is nonzero, searches only the specified context
2736 (but skips any tag-transparent contexts to find one that is
2737 meaningful for tags).
2738 CODE says which kind of type the caller wants;
2739 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2740 If the wrong kind of type is found, an error is reported. */
2743 lookup_tag (code, name, binding_level, thislevel_only)
2744 enum tree_code code;
2745 struct binding_level *binding_level;
2749 struct binding_level *level;
2752 for (level = binding_level; level; level = level->level_chain)
2755 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2757 if (TREE_PURPOSE (tail) == name)
2759 if (TREE_CODE (TREE_VALUE (tail)) != code)
2761 /* Definition isn't the kind we were looking for. */
2762 pending_invalid_xref = name;
2763 pending_invalid_xref_file = input_filename;
2764 pending_invalid_xref_line = lineno;
2765 /* If in the same binding level as a declaration as a tag
2766 of a different type, this must not be allowed to
2767 shadow that tag, so give the error immediately.
2768 (For example, "struct foo; union foo;" is invalid.) */
2770 pending_xref_error ();
2772 return TREE_VALUE (tail);
2775 if (! level->tag_transparent)
2785 /* Print an error message now
2786 for a recent invalid struct, union or enum cross reference.
2787 We don't print them immediately because they are not invalid
2788 when used in the `struct foo;' construct for shadowing. */
2791 pending_xref_error ()
2793 if (pending_invalid_xref != 0)
2794 error_with_file_and_line (pending_invalid_xref_file,
2795 pending_invalid_xref_line,
2796 "`%s' defined as wrong kind of tag",
2797 IDENTIFIER_POINTER (pending_invalid_xref));
2798 pending_invalid_xref = 0;
2801 /* Given a type, find the tag that was defined for it and return the tag name.
2802 Otherwise return 0. */
2805 lookup_tag_reverse (type)
2808 struct binding_level *level;
2810 for (level = current_binding_level; level; level = level->level_chain)
2813 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2815 if (TREE_VALUE (tail) == type)
2816 return TREE_PURPOSE (tail);
2822 /* Look up NAME in the current binding level and its superiors
2823 in the namespace of variables, functions and typedefs.
2824 Return a ..._DECL node of some kind representing its definition,
2825 or return 0 if it is undefined. */
2833 if (current_binding_level != global_binding_level
2834 && IDENTIFIER_LOCAL_VALUE (name))
2835 val = IDENTIFIER_LOCAL_VALUE (name);
2837 val = IDENTIFIER_GLOBAL_VALUE (name);
2841 /* Similar to `lookup_name' but look only at current binding level. */
2844 lookup_name_current_level (name)
2849 if (current_binding_level == global_binding_level)
2850 return IDENTIFIER_GLOBAL_VALUE (name);
2852 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2855 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2856 if (DECL_NAME (t) == name)
2862 /* Mark ARG for GC. */
2865 mark_binding_level (arg)
2868 struct binding_level *level = *(struct binding_level **) arg;
2870 for (; level != 0; level = level->level_chain)
2872 ggc_mark_tree (level->names);
2873 ggc_mark_tree (level->tags);
2874 ggc_mark_tree (level->shadowed);
2875 ggc_mark_tree (level->blocks);
2876 ggc_mark_tree (level->this_block);
2877 ggc_mark_tree (level->parm_order);
2881 /* Create the predefined scalar types of C,
2882 and some nodes representing standard constants (0, 1, (void *) 0).
2883 Initialize the global binding level.
2884 Make definitions for built-in primitive functions. */
2887 c_init_decl_processing ()
2890 tree ptr_ftype_void, ptr_ftype_ptr;
2892 /* Adds some ggc roots, and reserved words for c-parse.in. */
2895 current_function_decl = NULL;
2896 named_labels = NULL;
2897 current_binding_level = NULL_BINDING_LEVEL;
2898 free_binding_level = NULL_BINDING_LEVEL;
2900 /* Make the binding_level structure for global names. */
2902 global_binding_level = current_binding_level;
2904 build_common_tree_nodes (flag_signed_char);
2906 c_common_nodes_and_builtins ();
2908 boolean_type_node = integer_type_node;
2909 boolean_true_node = integer_one_node;
2910 boolean_false_node = integer_zero_node;
2912 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2913 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2914 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2915 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2916 TYPE_PRECISION (c_bool_type_node) = 1;
2917 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2919 c_bool_false_node = build_int_2 (0, 0);
2920 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2921 c_bool_true_node = build_int_2 (1, 0);
2922 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2924 endlink = void_list_node;
2925 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2927 = build_function_type (ptr_type_node,
2928 tree_cons (NULL_TREE, ptr_type_node, endlink));
2930 pedantic_lvalues = pedantic;
2932 make_fname_decl = c_make_fname_decl;
2933 start_fname_decls ();
2935 /* Record our roots. */
2937 ggc_add_tree_root (c_global_trees, CTI_MAX);
2938 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
2939 ggc_add_tree_root (&c_scope_stmt_stack, 1);
2940 ggc_add_tree_root (&named_labels, 1);
2941 ggc_add_tree_root (&shadowed_labels, 1);
2942 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
2943 mark_binding_level);
2944 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
2945 mark_binding_level);
2946 ggc_add_tree_root (&static_ctors, 1);
2947 ggc_add_tree_root (&static_dtors, 1);
2950 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2951 decl, NAME is the initialization string and TYPE_DEP indicates whether
2952 NAME depended on the type of the function. As we don't yet implement
2953 delayed emission of static data, we mark the decl as emitted
2954 so it is not placed in the output. Anything using it must therefore pull
2955 out the STRING_CST initializer directly. This does mean that these names
2956 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2959 c_make_fname_decl (id, type_dep)
2963 const char *name = fname_as_string (type_dep);
2964 tree decl, type, init;
2965 size_t length = strlen (name);
2967 type = build_array_type
2968 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2969 build_index_type (size_int (length)));
2971 decl = build_decl (VAR_DECL, id, type);
2972 /* We don't push the decl, so have to set its context here. */
2973 DECL_CONTEXT (decl) = current_function_decl;
2975 TREE_STATIC (decl) = 1;
2976 TREE_READONLY (decl) = 1;
2977 DECL_ARTIFICIAL (decl) = 1;
2979 init = build_string (length + 1, name);
2980 TREE_TYPE (init) = type;
2981 DECL_INITIAL (decl) = init;
2983 TREE_USED (decl) = 1;
2985 finish_decl (decl, init, NULL_TREE);
2990 /* Return a definition for a builtin function named NAME and whose data type
2991 is TYPE. TYPE should be a function type with argument types.
2992 FUNCTION_CODE tells later passes how to compile calls to this function.
2993 See tree.h for its possible values.
2995 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2996 the name to be called if we can't opencode the function. */
2999 builtin_function (name, type, function_code, class, library_name)
3003 enum built_in_class class;
3004 const char *library_name;
3006 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3007 DECL_EXTERNAL (decl) = 1;
3008 TREE_PUBLIC (decl) = 1;
3010 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3011 make_decl_rtl (decl, NULL);
3013 DECL_BUILT_IN_CLASS (decl) = class;
3014 DECL_FUNCTION_CODE (decl) = function_code;
3016 /* The return builtins leave the current function. */
3017 if (function_code == BUILT_IN_RETURN || function_code == BUILT_IN_EH_RETURN)
3018 TREE_THIS_VOLATILE (decl) = 1;
3020 /* Warn if a function in the namespace for users
3021 is used without an occasion to consider it declared. */
3022 if (name[0] != '_' || name[1] != '_')
3023 C_DECL_ANTICIPATED (decl) = 1;
3025 /* Possibly apply some default attributes to this built-in function. */
3026 decl_attributes (&decl, NULL_TREE, 0);
3031 /* Apply default attributes to a function, if a system function with default
3035 c_insert_default_attributes (decl)
3038 if (!TREE_PUBLIC (decl))
3040 c_common_insert_default_attributes (decl);
3043 /* Called when a declaration is seen that contains no names to declare.
3044 If its type is a reference to a structure, union or enum inherited
3045 from a containing scope, shadow that tag name for the current scope
3046 with a forward reference.
3047 If its type defines a new named structure or union
3048 or defines an enum, it is valid but we need not do anything here.
3049 Otherwise, it is an error. */
3052 shadow_tag (declspecs)
3055 shadow_tag_warned (declspecs, 0);
3059 shadow_tag_warned (declspecs, warned)
3062 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3069 pending_invalid_xref = 0;
3071 /* Remove the attributes from declspecs, since they will confuse the
3073 split_specs_attrs (declspecs, &specs, &attrs);
3075 for (link = specs; link; link = TREE_CHAIN (link))
3077 tree value = TREE_VALUE (link);
3078 enum tree_code code = TREE_CODE (value);
3080 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3081 /* Used to test also that TYPE_SIZE (value) != 0.
3082 That caused warning for `struct foo;' at top level in the file. */
3084 tree name = lookup_tag_reverse (value);
3091 if (warned != 1 && code != ENUMERAL_TYPE)
3092 /* Empty unnamed enum OK */
3094 pedwarn ("unnamed struct/union that defines no instances");
3100 t = lookup_tag (code, name, current_binding_level, 1);
3104 t = make_node (code);
3111 if (!warned && ! in_system_header)
3113 warning ("useless keyword or type name in empty declaration");
3120 error ("two types specified in one empty declaration");
3125 pedwarn ("empty declaration");
3129 /* Construct an array declarator. EXPR is the expression inside [], or
3130 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3131 to the pointer to which a parameter array is converted). STATIC_P is
3132 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3133 is non-zero is the array is [*], a VLA of unspecified length which is
3134 nevertheless a complete type (not currently implemented by GCC),
3135 zero otherwise. The declarator is constructed as an ARRAY_REF
3136 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3137 left of the [] (filled by in set_array_declarator_type) and operand 1
3138 is the expression inside; whose TREE_TYPE is the type qualifiers and
3139 which has TREE_STATIC set if "static" is used. */
3142 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3149 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3150 TREE_TYPE (decl) = quals;
3151 TREE_STATIC (decl) = (static_p ? 1 : 0);
3152 if (pedantic && !flag_isoc99)
3154 if (static_p || quals != NULL_TREE)
3155 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3157 pedwarn ("ISO C89 does not support `[*]' array declarators");
3160 warning ("GCC does not yet properly implement `[*]' array declarators");
3164 /* Set the type of an array declarator. DECL is the declarator, as
3165 constructed by build_array_declarator; TYPE is what appears on the left
3166 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3167 abstract declarator, zero otherwise; this is used to reject static and
3168 type qualifiers in abstract declarators, where they are not in the
3172 set_array_declarator_type (decl, type, abstract_p)
3177 TREE_OPERAND (decl, 0) = type;
3178 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3179 error ("static or type qualifiers in abstract declarator");
3183 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3186 groktypename (typename)
3191 if (TREE_CODE (typename) != TREE_LIST)
3194 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3196 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
3198 /* Apply attributes. */
3199 decl_attributes (&typename, attrs, 0);
3204 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3207 groktypename_in_parm_context (typename)
3210 if (TREE_CODE (typename) != TREE_LIST)
3212 return grokdeclarator (TREE_VALUE (typename),
3213 TREE_PURPOSE (typename),
3217 /* Decode a declarator in an ordinary declaration or data definition.
3218 This is called as soon as the type information and variable name
3219 have been parsed, before parsing the initializer if any.
3220 Here we create the ..._DECL node, fill in its type,
3221 and put it on the list of decls for the current context.
3222 The ..._DECL node is returned as the value.
3224 Exception: for arrays where the length is not specified,
3225 the type is left null, to be filled in by `finish_decl'.
3227 Function definitions do not come here; they go to start_function
3228 instead. However, external and forward declarations of functions
3229 do go through here. Structure field declarations are done by
3230 grokfield and not through here. */
3233 start_decl (declarator, declspecs, initialized, attributes)
3234 tree declarator, declspecs;
3241 /* An object declared as __attribute__((deprecated)) suppresses
3242 warnings of uses of other deprecated items. */
3243 if (lookup_attribute ("deprecated", attributes))
3244 deprecated_state = DEPRECATED_SUPPRESS;
3246 decl = grokdeclarator (declarator, declspecs,
3247 NORMAL, initialized);
3249 deprecated_state = DEPRECATED_NORMAL;
3251 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3252 && MAIN_NAME_P (DECL_NAME (decl)))
3253 warning_with_decl (decl, "`%s' is usually a function");
3256 /* Is it valid for this decl to have an initializer at all?
3257 If not, set INITIALIZED to zero, which will indirectly
3258 tell `finish_decl' to ignore the initializer once it is parsed. */
3259 switch (TREE_CODE (decl))
3262 /* typedef foo = bar means give foo the same type as bar.
3263 We haven't parsed bar yet, so `finish_decl' will fix that up.
3264 Any other case of an initialization in a TYPE_DECL is an error. */
3265 if (pedantic || list_length (declspecs) > 1)
3267 error ("typedef `%s' is initialized",
3268 IDENTIFIER_POINTER (DECL_NAME (decl)));
3274 error ("function `%s' is initialized like a variable",
3275 IDENTIFIER_POINTER (DECL_NAME (decl)));
3280 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3281 error ("parameter `%s' is initialized",
3282 IDENTIFIER_POINTER (DECL_NAME (decl)));
3287 /* Don't allow initializations for incomplete types
3288 except for arrays which might be completed by the initialization. */
3290 /* This can happen if the array size is an undefined macro. We already
3291 gave a warning, so we don't need another one. */
3292 if (TREE_TYPE (decl) == error_mark_node)
3294 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3296 /* A complete type is ok if size is fixed. */
3298 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3299 || C_DECL_VARIABLE_SIZE (decl))
3301 error ("variable-sized object may not be initialized");
3305 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3307 error ("variable `%s' has initializer but incomplete type",
3308 IDENTIFIER_POINTER (DECL_NAME (decl)));
3311 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3313 error ("elements of array `%s' have incomplete type",
3314 IDENTIFIER_POINTER (DECL_NAME (decl)));
3322 /* Seems redundant with grokdeclarator. */
3323 if (current_binding_level != global_binding_level
3324 && DECL_EXTERNAL (decl)
3325 && TREE_CODE (decl) != FUNCTION_DECL)
3326 warning ("declaration of `%s' has `extern' and is initialized",
3327 IDENTIFIER_POINTER (DECL_NAME (decl)));
3329 DECL_EXTERNAL (decl) = 0;
3330 if (current_binding_level == global_binding_level)
3331 TREE_STATIC (decl) = 1;
3333 /* Tell `pushdecl' this is an initialized decl
3334 even though we don't yet have the initializer expression.
3335 Also tell `finish_decl' it may store the real initializer. */
3336 DECL_INITIAL (decl) = error_mark_node;
3339 /* If this is a function declaration, write a record describing it to the
3340 prototypes file (if requested). */
3342 if (TREE_CODE (decl) == FUNCTION_DECL)
3343 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3345 /* ANSI specifies that a tentative definition which is not merged with
3346 a non-tentative definition behaves exactly like a definition with an
3347 initializer equal to zero. (Section 3.7.2)
3348 -fno-common gives strict ANSI behavior. Usually you don't want it.
3349 This matters only for variables with external linkage. */
3350 if (!initialized && (! flag_no_common || ! TREE_PUBLIC (decl)))
3351 DECL_COMMON (decl) = 1;
3353 /* Set attributes here so if duplicate decl, will have proper attributes. */
3354 decl_attributes (&decl, attributes, 0);
3356 /* If #pragma weak was used, mark the decl weak now. */
3357 if (current_binding_level == global_binding_level)
3358 maybe_apply_pragma_weak (decl);
3360 if (TREE_CODE (decl) == FUNCTION_DECL
3361 && DECL_DECLARED_INLINE_P (decl)
3362 && DECL_UNINLINABLE (decl)
3363 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3364 warning_with_decl (decl,
3365 "inline function `%s' given attribute noinline");
3367 /* Add this decl to the current binding level.
3368 TEM may equal DECL or it may be a previous decl of the same name. */
3369 tem = pushdecl (decl);
3371 /* For a local variable, define the RTL now. */
3372 if (current_binding_level != global_binding_level
3373 /* But not if this is a duplicate decl
3374 and we preserved the rtl from the previous one
3375 (which may or may not happen). */
3376 && !DECL_RTL_SET_P (tem)
3377 && !DECL_CONTEXT (tem))
3379 if (TREE_TYPE (tem) != error_mark_node
3380 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3382 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3383 && DECL_INITIAL (tem) != 0)
3390 /* Finish processing of a declaration;
3391 install its initial value.
3392 If the length of an array type is not known before,
3393 it must be determined now, from the initial value, or it is an error. */
3396 finish_decl (decl, init, asmspec_tree)
3400 tree type = TREE_TYPE (decl);
3401 int was_incomplete = (DECL_SIZE (decl) == 0);
3402 const char *asmspec = 0;
3404 /* If a name was specified, get the string. */
3405 if (current_binding_level == global_binding_level)
3406 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3408 asmspec = TREE_STRING_POINTER (asmspec_tree);
3410 /* If `start_decl' didn't like having an initialization, ignore it now. */
3411 if (init != 0 && DECL_INITIAL (decl) == 0)
3414 /* Don't crash if parm is initialized. */
3415 if (TREE_CODE (decl) == PARM_DECL)
3420 if (TREE_CODE (decl) != TYPE_DECL)
3421 store_init_value (decl, init);
3424 /* typedef foo = bar; store the type of bar as the type of foo. */
3425 TREE_TYPE (decl) = TREE_TYPE (init);
3426 DECL_INITIAL (decl) = init = 0;
3430 /* Deduce size of array from initialization, if not already known */
3431 if (TREE_CODE (type) == ARRAY_TYPE
3432 && TYPE_DOMAIN (type) == 0
3433 && TREE_CODE (decl) != TYPE_DECL)
3436 = (TREE_STATIC (decl)
3437 /* Even if pedantic, an external linkage array
3438 may have incomplete type at first. */
3439 ? pedantic && !TREE_PUBLIC (decl)
3440 : !DECL_EXTERNAL (decl));
3442 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3444 /* Get the completed type made by complete_array_type. */
3445 type = TREE_TYPE (decl);
3448 error_with_decl (decl, "initializer fails to determine size of `%s'");
3450 else if (failure == 2)
3453 error_with_decl (decl, "array size missing in `%s'");
3454 /* If a `static' var's size isn't known,
3455 make it extern as well as static, so it does not get
3457 If it is not `static', then do not mark extern;
3458 finish_incomplete_decl will give it a default size
3459 and it will get allocated. */
3460 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3461 DECL_EXTERNAL (decl) = 1;
3464 /* TYPE_MAX_VALUE is always one less than the number of elements
3465 in the array, because we start counting at zero. Therefore,
3466 warn only if the value is less than zero. */
3467 else if (pedantic && TYPE_DOMAIN (type) != 0
3468 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3469 error_with_decl (decl, "zero or negative size array `%s'");
3471 layout_decl (decl, 0);
3474 if (TREE_CODE (decl) == VAR_DECL)
3476 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3477 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3478 layout_decl (decl, 0);
3480 if (DECL_SIZE (decl) == 0
3481 /* Don't give an error if we already gave one earlier. */
3482 && TREE_TYPE (decl) != error_mark_node
3483 && (TREE_STATIC (decl)
3485 /* A static variable with an incomplete type
3486 is an error if it is initialized.
3487 Also if it is not file scope.
3488 Otherwise, let it through, but if it is not `extern'
3489 then it may cause an error message later. */
3490 (DECL_INITIAL (decl) != 0
3491 || DECL_CONTEXT (decl) != 0)
3493 /* An automatic variable with an incomplete type
3495 !DECL_EXTERNAL (decl)))
3497 error_with_decl (decl, "storage size of `%s' isn't known");
3498 TREE_TYPE (decl) = error_mark_node;
3501 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3502 && DECL_SIZE (decl) != 0)
3504 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3505 constant_expression_warning (DECL_SIZE (decl));
3507 error_with_decl (decl, "storage size of `%s' isn't constant");
3510 if (TREE_USED (type))
3511 TREE_USED (decl) = 1;
3514 /* If this is a function and an assembler name is specified, it isn't
3515 builtin any more. Also reset DECL_RTL so we can give it its new
3517 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3519 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3520 SET_DECL_RTL (decl, NULL_RTX);
3521 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3524 /* Output the assembler code and/or RTL code for variables and functions,
3525 unless the type is an undefined structure or union.
3526 If not, it will get done when the type is completed. */
3528 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3530 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3531 maybe_objc_check_decl (decl);
3533 if (!DECL_CONTEXT (decl))
3535 if (DECL_INITIAL (decl) == NULL_TREE
3536 || DECL_INITIAL (decl) == error_mark_node)
3537 /* Don't output anything
3538 when a tentative file-scope definition is seen.
3539 But at end of compilation, do output code for them. */
3540 DECL_DEFER_OUTPUT (decl) = 1;
3541 rest_of_decl_compilation (decl, asmspec,
3542 (DECL_CONTEXT (decl) == 0
3543 || TREE_ASM_WRITTEN (decl)), 0);
3547 /* This is a local variable. If there is an ASMSPEC, the
3548 user has requested that we handle it specially. */
3551 /* In conjunction with an ASMSPEC, the `register'
3552 keyword indicates that we should place the variable
3553 in a particular register. */
3554 if (DECL_REGISTER (decl))
3555 DECL_C_HARD_REGISTER (decl) = 1;
3557 /* If this is not a static variable, issue a warning.
3558 It doesn't make any sense to give an ASMSPEC for an
3559 ordinary, non-register local variable. Historically,
3560 GCC has accepted -- but ignored -- the ASMSPEC in
3562 if (TREE_CODE (decl) == VAR_DECL
3563 && !DECL_REGISTER (decl)
3564 && !TREE_STATIC (decl))
3565 warning_with_decl (decl,
3566 "ignoring asm-specifier for non-static local variable `%s'");
3568 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3571 if (TREE_CODE (decl) != FUNCTION_DECL)
3572 add_decl_stmt (decl);
3575 if (DECL_CONTEXT (decl) != 0)
3577 /* Recompute the RTL of a local array now
3578 if it used to be an incomplete type. */
3580 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3582 /* If we used it already as memory, it must stay in memory. */
3583 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3584 /* If it's still incomplete now, no init will save it. */
3585 if (DECL_SIZE (decl) == 0)
3586 DECL_INITIAL (decl) = 0;
3591 if (TREE_CODE (decl) == TYPE_DECL)
3593 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3594 maybe_objc_check_decl (decl);
3595 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3598 /* At the end of a declaration, throw away any variable type sizes
3599 of types defined inside that declaration. There is no use
3600 computing them in the following function definition. */
3601 if (current_binding_level == global_binding_level)
3602 get_pending_sizes ();
3605 /* Given a parsed parameter declaration,
3606 decode it into a PARM_DECL and push that on the current binding level.
3607 Also, for the sake of forward parm decls,
3608 record the given order of parms in `parm_order'. */
3611 push_parm_decl (parm)
3615 int old_immediate_size_expand = immediate_size_expand;
3616 /* Don't try computing parm sizes now -- wait till fn is called. */
3617 immediate_size_expand = 0;
3619 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3620 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3621 decl_attributes (&decl, TREE_VALUE (parm), 0);
3624 if (DECL_NAME (decl))
3627 olddecl = lookup_name (DECL_NAME (decl));
3628 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3629 pedwarn_with_decl (decl,
3630 "ISO C forbids parameter `%s' shadowing typedef");
3634 decl = pushdecl (decl);
3636 immediate_size_expand = old_immediate_size_expand;
3638 current_binding_level->parm_order
3639 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3641 /* Add this decl to the current binding level. */
3642 finish_decl (decl, NULL_TREE, NULL_TREE);
3645 /* Clear the given order of parms in `parm_order'.
3646 Used at start of parm list,
3647 and also at semicolon terminating forward decls. */
3652 current_binding_level->parm_order = NULL_TREE;
3655 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3656 literal, which may be an incomplete array type completed by the
3657 initializer; INIT is a CONSTRUCTOR that initializes the compound
3661 build_compound_literal (type, init)
3665 /* We do not use start_decl here because we have a type, not a declarator;
3666 and do not use finish_decl because the decl should be stored inside
3667 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3668 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3671 DECL_EXTERNAL (decl) = 0;
3672 TREE_PUBLIC (decl) = 0;
3673 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3674 DECL_CONTEXT (decl) = current_function_decl;
3675 TREE_USED (decl) = 1;
3676 TREE_TYPE (decl) = type;
3677 store_init_value (decl, init);
3679 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3681 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3686 type = TREE_TYPE (decl);
3687 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3688 return error_mark_node;
3690 stmt = build_stmt (DECL_STMT, decl);
3691 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3692 TREE_SIDE_EFFECTS (complit) = 1;
3694 layout_decl (decl, 0);
3696 if (TREE_STATIC (decl))
3698 /* This decl needs a name for the assembler output. We also need
3699 a unique suffix to be added to the name, for which DECL_CONTEXT
3701 DECL_NAME (decl) = get_identifier ("__compound_literal");
3702 DECL_CONTEXT (decl) = complit;
3703 rest_of_decl_compilation (decl, NULL, 1, 0);
3704 DECL_CONTEXT (decl) = NULL_TREE;
3710 /* Make TYPE a complete type based on INITIAL_VALUE.
3711 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3712 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3715 complete_array_type (type, initial_value, do_default)
3720 tree maxindex = NULL_TREE;
3725 /* Note MAXINDEX is really the maximum index,
3726 one less than the size. */
3727 if (TREE_CODE (initial_value) == STRING_CST)
3730 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3731 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3734 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3736 tree elts = CONSTRUCTOR_ELTS (initial_value);
3737 maxindex = build_int_2 (-1, -1);
3738 for (; elts; elts = TREE_CHAIN (elts))
3740 if (TREE_PURPOSE (elts))
3741 maxindex = TREE_PURPOSE (elts);
3743 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3744 maxindex, integer_one_node));
3746 maxindex = copy_node (maxindex);
3750 /* Make an error message unless that happened already. */
3751 if (initial_value != error_mark_node)
3754 /* Prevent further error messages. */
3755 maxindex = build_int_2 (0, 0);
3762 maxindex = build_int_2 (0, 0);
3768 TYPE_DOMAIN (type) = build_index_type (maxindex);
3769 if (!TREE_TYPE (maxindex))
3770 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3773 /* Lay out the type now that we can get the real answer. */
3780 /* Given declspecs and a declarator,
3781 determine the name and type of the object declared
3782 and construct a ..._DECL node for it.
3783 (In one case we can return a ..._TYPE node instead.
3784 For invalid input we sometimes return 0.)
3786 DECLSPECS is a chain of tree_list nodes whose value fields
3787 are the storage classes and type specifiers.
3789 DECL_CONTEXT says which syntactic context this declaration is in:
3790 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3791 FUNCDEF for a function definition. Like NORMAL but a few different
3792 error messages in each case. Return value may be zero meaning
3793 this definition is too screwy to try to parse.
3794 PARM for a parameter declaration (either within a function prototype
3795 or before a function body). Make a PARM_DECL, or return void_type_node.
3796 TYPENAME if for a typename (in a cast or sizeof).
3797 Don't make a DECL node; just return the ..._TYPE node.
3798 FIELD for a struct or union field; make a FIELD_DECL.
3799 BITFIELD for a field with specified width.
3800 INITIALIZED is 1 if the decl has an initializer.
3802 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3803 It may also be so in the PARM case, for a prototype where the
3804 argument type is specified but not the name.
3806 This function is where the complicated C meanings of `static'
3807 and `extern' are interpreted. */
3810 grokdeclarator (declarator, declspecs, decl_context, initialized)
3813 enum decl_context decl_context;
3818 tree type = NULL_TREE;
3823 int type_quals = TYPE_UNQUALIFIED;
3825 int explicit_int = 0;
3826 int explicit_char = 0;
3827 int defaulted_int = 0;
3828 tree typedef_decl = 0;
3830 tree typedef_type = 0;
3831 int funcdef_flag = 0;
3832 enum tree_code innermost_code = ERROR_MARK;
3834 int size_varies = 0;
3835 tree decl_attr = NULL_TREE;
3836 tree array_ptr_quals = NULL_TREE;
3837 int array_parm_static = 0;
3838 tree returned_attrs = NULL_TREE;
3840 if (decl_context == BITFIELD)
3841 bitfield = 1, decl_context = FIELD;
3843 if (decl_context == FUNCDEF)
3844 funcdef_flag = 1, decl_context = NORMAL;
3846 /* Look inside a declarator for the name being declared
3847 and get it as a string, for an error message. */
3849 tree decl = declarator;
3853 switch (TREE_CODE (decl))
3858 innermost_code = TREE_CODE (decl);
3859 decl = TREE_OPERAND (decl, 0);
3863 decl = TREE_VALUE (decl);
3866 case IDENTIFIER_NODE:
3867 name = IDENTIFIER_POINTER (decl);
3878 /* A function definition's declarator must have the form of
3879 a function declarator. */
3881 if (funcdef_flag && innermost_code != CALL_EXPR)
3884 /* Anything declared one level down from the top level
3885 must be one of the parameters of a function
3886 (because the body is at least two levels down). */
3888 /* If this looks like a function definition, make it one,
3889 even if it occurs where parms are expected.
3890 Then store_parm_decls will reject it and not use it as a parm. */
3891 if (decl_context == NORMAL && !funcdef_flag
3892 && current_binding_level->parm_flag)
3893 decl_context = PARM;
3895 /* Look through the decl specs and record which ones appear.
3896 Some typespecs are defined as built-in typenames.
3897 Others, the ones that are modifiers of other types,
3898 are represented by bits in SPECBITS: set the bits for
3899 the modifiers that appear. Storage class keywords are also in SPECBITS.
3901 If there is a typedef name or a type, store the type in TYPE.
3902 This includes builtin typedefs such as `int'.
3904 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3905 and did not come from a user typedef.
3907 Set LONGLONG if `long' is mentioned twice. */
3909 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3911 tree id = TREE_VALUE (spec);
3913 /* If the entire declaration is itself tagged as deprecated then
3914 suppress reports of deprecated items. */
3915 if (id && TREE_DEPRECATED (id))
3917 if (deprecated_state != DEPRECATED_SUPPRESS)
3918 warn_deprecated_use (id);
3921 if (id == ridpointers[(int) RID_INT])
3923 if (id == ridpointers[(int) RID_CHAR])
3926 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3928 enum rid i = C_RID_CODE (id);
3929 if ((int) i <= (int) RID_LAST_MODIFIER)
3931 if (i == RID_LONG && (specbits & (1 << (int) i)))
3934 error ("`long long long' is too long for GCC");
3937 if (pedantic && !flag_isoc99 && ! in_system_header
3939 pedwarn ("ISO C89 does not support `long long'");
3943 else if (specbits & (1 << (int) i))
3944 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3945 specbits |= 1 << (int) i;
3950 error ("two or more data types in declaration of `%s'", name);
3951 /* Actual typedefs come to us as TYPE_DECL nodes. */
3952 else if (TREE_CODE (id) == TYPE_DECL)
3954 if (TREE_TYPE (id) == error_mark_node)
3955 ; /* Allow the type to default to int to avoid cascading errors. */
3958 type = TREE_TYPE (id);
3959 decl_attr = DECL_ATTRIBUTES (id);
3963 /* Built-in types come as identifiers. */
3964 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3966 tree t = lookup_name (id);
3967 if (TREE_TYPE (t) == error_mark_node)
3969 else if (!t || TREE_CODE (t) != TYPE_DECL)
3970 error ("`%s' fails to be a typedef or built in type",
3971 IDENTIFIER_POINTER (id));
3974 type = TREE_TYPE (t);
3978 else if (TREE_CODE (id) != ERROR_MARK)
3985 typedef_type = type;
3987 size_varies = C_TYPE_VARIABLE_SIZE (type);
3989 /* No type at all: default to `int', and set DEFAULTED_INT
3990 because it was not a user-defined typedef. */
3994 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3995 | (1 << (int) RID_SIGNED)
3996 | (1 << (int) RID_UNSIGNED)
3997 | (1 << (int) RID_COMPLEX))))
3998 /* Don't warn about typedef foo = bar. */
3999 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4000 && ! in_system_header)
4002 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4003 and this is a function, or if -Wimplicit; prefer the former
4004 warning since it is more explicit. */
4005 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4007 warn_about_return_type = 1;
4008 else if (warn_implicit_int || flag_isoc99)
4009 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4014 type = integer_type_node;
4017 /* Now process the modifiers that were specified
4018 and check for invalid combinations. */
4020 /* Long double is a special combination. */
4022 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4023 && TYPE_MAIN_VARIANT (type) == double_type_node)
4025 specbits &= ~(1 << (int) RID_LONG);
4026 type = long_double_type_node;
4029 /* Check all other uses of type modifiers. */
4031 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4032 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4036 if ((specbits & 1 << (int) RID_LONG)
4037 && (specbits & 1 << (int) RID_SHORT))
4038 error ("both long and short specified for `%s'", name);
4039 else if (((specbits & 1 << (int) RID_LONG)
4040 || (specbits & 1 << (int) RID_SHORT))
4042 error ("long or short specified with char for `%s'", name);
4043 else if (((specbits & 1 << (int) RID_LONG)
4044 || (specbits & 1 << (int) RID_SHORT))
4045 && TREE_CODE (type) == REAL_TYPE)
4047 static int already = 0;
4049 error ("long or short specified with floating type for `%s'", name);
4050 if (! already && ! pedantic)
4052 error ("the only valid combination is `long double'");
4056 else if ((specbits & 1 << (int) RID_SIGNED)
4057 && (specbits & 1 << (int) RID_UNSIGNED))
4058 error ("both signed and unsigned specified for `%s'", name);
4059 else if (TREE_CODE (type) != INTEGER_TYPE)
4060 error ("long, short, signed or unsigned invalid for `%s'", name);
4064 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4066 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4068 if (flag_pedantic_errors)
4073 /* Discard the type modifiers if they are invalid. */
4076 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4077 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4082 if ((specbits & (1 << (int) RID_COMPLEX))
4083 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4085 error ("complex invalid for `%s'", name);
4086 specbits &= ~(1 << (int) RID_COMPLEX);
4089 /* Decide whether an integer type is signed or not.
4090 Optionally treat bitfields as signed by default. */
4091 if (specbits & 1 << (int) RID_UNSIGNED
4092 || (bitfield && ! flag_signed_bitfields
4093 && (explicit_int || defaulted_int || explicit_char
4094 /* A typedef for plain `int' without `signed'
4095 can be controlled just like plain `int'. */
4096 || ! (typedef_decl != 0
4097 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4098 && TREE_CODE (type) != ENUMERAL_TYPE
4099 && !(specbits & 1 << (int) RID_SIGNED)))
4102 type = long_long_unsigned_type_node;
4103 else if (specbits & 1 << (int) RID_LONG)
4104 type = long_unsigned_type_node;
4105 else if (specbits & 1 << (int) RID_SHORT)
4106 type = short_unsigned_type_node;
4107 else if (type == char_type_node)
4108 type = unsigned_char_type_node;
4109 else if (typedef_decl)
4110 type = c_common_unsigned_type (type);
4112 type = unsigned_type_node;
4114 else if ((specbits & 1 << (int) RID_SIGNED)
4115 && type == char_type_node)
4116 type = signed_char_type_node;
4118 type = long_long_integer_type_node;
4119 else if (specbits & 1 << (int) RID_LONG)
4120 type = long_integer_type_node;
4121 else if (specbits & 1 << (int) RID_SHORT)
4122 type = short_integer_type_node;
4124 if (specbits & 1 << (int) RID_COMPLEX)
4126 if (pedantic && !flag_isoc99)
4127 pedwarn ("ISO C89 does not support complex types");
4128 /* If we just have "complex", it is equivalent to
4129 "complex double", but if any modifiers at all are specified it is
4130 the complex form of TYPE. E.g, "complex short" is
4131 "complex short int". */
4133 if (defaulted_int && ! longlong
4134 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4135 | (1 << (int) RID_SIGNED)
4136 | (1 << (int) RID_UNSIGNED))))
4139 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4140 type = complex_double_type_node;
4142 else if (type == integer_type_node)
4145 pedwarn ("ISO C does not support complex integer types");
4146 type = complex_integer_type_node;
4148 else if (type == float_type_node)
4149 type = complex_float_type_node;
4150 else if (type == double_type_node)
4151 type = complex_double_type_node;
4152 else if (type == long_double_type_node)
4153 type = complex_long_double_type_node;
4157 pedwarn ("ISO C does not support complex integer types");
4158 type = build_complex_type (type);
4162 /* Figure out the type qualifiers for the declaration. There are
4163 two ways a declaration can become qualified. One is something
4164 like `const int i' where the `const' is explicit. Another is
4165 something like `typedef const int CI; CI i' where the type of the
4166 declaration contains the `const'. */
4167 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4168 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4169 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4170 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4171 if (constp > 1 && ! flag_isoc99)
4172 pedwarn ("duplicate `const'");
4173 if (restrictp > 1 && ! flag_isoc99)
4174 pedwarn ("duplicate `restrict'");
4175 if (volatilep > 1 && ! flag_isoc99)
4176 pedwarn ("duplicate `volatile'");
4177 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4178 type = TYPE_MAIN_VARIANT (type);
4179 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4180 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4181 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4183 /* Warn if two storage classes are given. Default to `auto'. */
4188 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4189 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4190 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4191 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4192 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4194 /* Warn about storage classes that are invalid for certain
4195 kinds of declarations (parameters, typenames, etc.). */
4198 error ("multiple storage classes in declaration of `%s'", name);
4199 else if (funcdef_flag
4201 & ((1 << (int) RID_REGISTER)
4202 | (1 << (int) RID_AUTO)
4203 | (1 << (int) RID_TYPEDEF))))
4205 if (specbits & 1 << (int) RID_AUTO
4206 && (pedantic || current_binding_level == global_binding_level))
4207 pedwarn ("function definition declared `auto'");
4208 if (specbits & 1 << (int) RID_REGISTER)
4209 error ("function definition declared `register'");
4210 if (specbits & 1 << (int) RID_TYPEDEF)
4211 error ("function definition declared `typedef'");
4212 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4213 | (1 << (int) RID_AUTO));
4215 else if (decl_context != NORMAL && nclasses > 0)
4217 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4221 switch (decl_context)
4224 error ("storage class specified for structure field `%s'",
4228 error ("storage class specified for parameter `%s'", name);
4231 error ("storage class specified for typename");
4234 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4235 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4236 | (1 << (int) RID_EXTERN));
4239 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4241 /* `extern' with initialization is invalid if not at top level. */
4242 if (current_binding_level == global_binding_level)
4243 warning ("`%s' initialized and declared `extern'", name);
4245 error ("`%s' has both `extern' and initializer", name);
4247 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4248 && current_binding_level != global_binding_level)
4249 error ("nested function `%s' declared `extern'", name);
4250 else if (current_binding_level == global_binding_level
4251 && specbits & (1 << (int) RID_AUTO))
4252 error ("top-level declaration of `%s' specifies `auto'", name);
4255 /* Now figure out the structure of the declarator proper.
4256 Descend through it, creating more complex types, until we reach
4257 the declared identifier (or NULL_TREE, in an absolute declarator). */
4259 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4261 if (type == error_mark_node)
4263 declarator = TREE_OPERAND (declarator, 0);
4267 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4268 an INDIRECT_REF (for *...),
4269 a CALL_EXPR (for ...(...)),
4270 a TREE_LIST (for nested attributes),
4271 an identifier (for the name being declared)
4272 or a null pointer (for the place in an absolute declarator
4273 where the name was omitted).
4274 For the last two cases, we have just exited the loop.
4276 At this point, TYPE is the type of elements of an array,
4277 or for a function to return, or for a pointer to point to.
4278 After this sequence of ifs, TYPE is the type of the
4279 array or function or pointer, and DECLARATOR has had its
4280 outermost layer removed. */
4282 if (array_ptr_quals != NULL_TREE || array_parm_static)
4284 /* Only the innermost declarator (making a parameter be of
4285 array type which is converted to pointer type)
4286 may have static or type qualifiers. */
4287 error ("static or type qualifiers in non-parameter array declarator");
4288 array_ptr_quals = NULL_TREE;
4289 array_parm_static = 0;
4292 if (TREE_CODE (declarator) == TREE_LIST)
4294 /* We encode a declarator with embedded attributes using
4296 tree attrs = TREE_PURPOSE (declarator);
4299 declarator = TREE_VALUE (declarator);
4300 inner_decl = declarator;
4301 while (inner_decl != NULL_TREE
4302 && TREE_CODE (inner_decl) == TREE_LIST)
4303 inner_decl = TREE_VALUE (inner_decl);
4304 if (inner_decl == NULL_TREE
4305 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4306 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4307 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4308 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4309 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4310 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4311 returned_attrs = decl_attributes (&type,
4312 chainon (returned_attrs, attrs),
4315 else if (TREE_CODE (declarator) == ARRAY_REF)
4317 tree itype = NULL_TREE;
4318 tree size = TREE_OPERAND (declarator, 1);
4319 /* The index is a signed object `sizetype' bits wide. */
4320 tree index_type = c_common_signed_type (sizetype);
4322 array_ptr_quals = TREE_TYPE (declarator);
4323 array_parm_static = TREE_STATIC (declarator);
4325 declarator = TREE_OPERAND (declarator, 0);
4327 /* Check for some types that there cannot be arrays of. */
4329 if (VOID_TYPE_P (type))
4331 error ("declaration of `%s' as array of voids", name);
4332 type = error_mark_node;
4335 if (TREE_CODE (type) == FUNCTION_TYPE)
4337 error ("declaration of `%s' as array of functions", name);
4338 type = error_mark_node;
4341 if (size == error_mark_node)
4342 type = error_mark_node;
4344 if (type == error_mark_node)
4347 /* If size was specified, set ITYPE to a range-type for that size.
4348 Otherwise, ITYPE remains null. finish_decl may figure it out
4349 from an initial value. */
4353 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4354 STRIP_TYPE_NOPS (size);
4356 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4358 error ("size of array `%s' has non-integer type", name);
4359 size = integer_one_node;
4362 if (pedantic && integer_zerop (size))
4363 pedwarn ("ISO C forbids zero-size array `%s'", name);
4365 if (TREE_CODE (size) == INTEGER_CST)
4367 constant_expression_warning (size);
4368 if (tree_int_cst_sgn (size) < 0)
4370 error ("size of array `%s' is negative", name);
4371 size = integer_one_node;
4376 /* Make sure the array size remains visibly nonconstant
4377 even if it is (eg) a const variable with known value. */
4380 if (!flag_isoc99 && pedantic)
4382 if (TREE_CONSTANT (size))
4383 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4386 pedwarn ("ISO C89 forbids variable-size array `%s'",
4391 if (integer_zerop (size))
4393 /* A zero-length array cannot be represented with an
4394 unsigned index type, which is what we'll get with
4395 build_index_type. Create an open-ended range instead. */
4396 itype = build_range_type (sizetype, size, NULL_TREE);
4400 /* Compute the maximum valid index, that is, size - 1.
4401 Do the calculation in index_type, so that if it is
4402 a variable the computations will be done in the
4404 itype = fold (build (MINUS_EXPR, index_type,
4405 convert (index_type, size),
4406 convert (index_type, size_one_node)));
4408 /* If that overflowed, the array is too big.
4409 ??? While a size of INT_MAX+1 technically shouldn't
4410 cause an overflow (because we subtract 1), the overflow
4411 is recorded during the conversion to index_type, before
4412 the subtraction. Handling this case seems like an
4413 unnecessary complication. */
4414 if (TREE_OVERFLOW (itype))
4416 error ("size of array `%s' is too large", name);
4417 type = error_mark_node;
4422 itype = variable_size (itype);
4423 itype = build_index_type (itype);
4426 else if (decl_context == FIELD)
4428 if (pedantic && !flag_isoc99 && !in_system_header)
4429 pedwarn ("ISO C89 does not support flexible array members");
4431 /* ISO C99 Flexible array members are effectively identical
4432 to GCC's zero-length array extension. */
4433 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4436 /* If pedantic, complain about arrays of incomplete types. */
4438 if (pedantic && !COMPLETE_TYPE_P (type))
4439 pedwarn ("array type has incomplete element type");
4442 /* We shouldn't have a function type here at all!
4443 Functions aren't allowed as array elements. */
4444 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4445 && (constp || volatilep))
4446 pedwarn ("ISO C forbids const or volatile function types");
4449 /* Build the array type itself, then merge any constancy or
4450 volatility into the target type. We must do it in this order
4451 to ensure that the TYPE_MAIN_VARIANT field of the array type
4452 is set correctly. */
4454 type = build_array_type (type, itype);
4456 type = c_build_qualified_type (type, type_quals);
4459 C_TYPE_VARIABLE_SIZE (type) = 1;
4461 /* The GCC extension for zero-length arrays differs from
4462 ISO flexible array members in that sizeof yields zero. */
4463 if (size && integer_zerop (size))
4466 TYPE_SIZE (type) = bitsize_zero_node;
4467 TYPE_SIZE_UNIT (type) = size_zero_node;
4469 if (decl_context != PARM
4470 && (array_ptr_quals != NULL_TREE || array_parm_static))
4472 error ("static or type qualifiers in non-parameter array declarator");
4473 array_ptr_quals = NULL_TREE;
4474 array_parm_static = 0;
4477 else if (TREE_CODE (declarator) == CALL_EXPR)
4481 /* Declaring a function type.
4482 Make sure we have a valid type for the function to return. */
4483 if (type == error_mark_node)
4488 /* Warn about some types functions can't return. */
4490 if (TREE_CODE (type) == FUNCTION_TYPE)
4492 error ("`%s' declared as function returning a function", name);
4493 type = integer_type_node;
4495 if (TREE_CODE (type) == ARRAY_TYPE)
4497 error ("`%s' declared as function returning an array", name);
4498 type = integer_type_node;
4501 /* Construct the function type and go to the next
4502 inner layer of declarator. */
4504 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4506 /* Say it's a definition
4507 only for the CALL_EXPR
4508 closest to the identifier. */
4509 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4510 /* Type qualifiers before the return type of the function
4511 qualify the return type, not the function type. */
4514 /* Type qualifiers on a function return type are normally
4515 permitted by the standard but have no effect, so give a
4516 warning at -W. Qualifiers on a void return type have
4517 meaning as a GNU extension, and are banned on function
4518 definitions in ISO C. FIXME: strictly we shouldn't
4519 pedwarn for qualified void return types except on function
4520 definitions, but not doing so could lead to the undesirable
4521 state of a "volatile void" function return type not being
4522 warned about, and a use of the function being compiled
4523 with GNU semantics, with no diagnostics under -pedantic. */
4524 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4525 pedwarn ("ISO C forbids qualified void function return type");
4526 else if (extra_warnings
4527 && !(VOID_TYPE_P (type)
4528 && type_quals == TYPE_QUAL_VOLATILE))
4529 warning ("type qualifiers ignored on function return type");
4531 type = c_build_qualified_type (type, type_quals);
4533 type_quals = TYPE_UNQUALIFIED;
4535 type = build_function_type (type, arg_types);
4536 declarator = TREE_OPERAND (declarator, 0);
4538 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4539 the formal parameter list of this FUNCTION_TYPE to point to
4540 the FUNCTION_TYPE node itself. */
4545 for (link = last_function_parm_tags;
4547 link = TREE_CHAIN (link))
4548 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4551 else if (TREE_CODE (declarator) == INDIRECT_REF)
4553 /* Merge any constancy or volatility into the target type
4556 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4558 pedwarn ("ISO C forbids qualified function types");
4560 type = c_build_qualified_type (type, type_quals);
4561 type_quals = TYPE_UNQUALIFIED;
4564 type = build_pointer_type (type);
4566 /* Process a list of type modifier keywords
4567 (such as const or volatile) that were given inside the `*'. */
4569 if (TREE_TYPE (declarator))
4577 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4578 typemodlist = TREE_CHAIN (typemodlist))
4580 tree qualifier = TREE_VALUE (typemodlist);
4582 if (C_IS_RESERVED_WORD (qualifier))
4584 if (C_RID_CODE (qualifier) == RID_CONST)
4586 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4588 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4598 error ("invalid type modifier within pointer declarator");
4599 if (constp > 1 && ! flag_isoc99)
4600 pedwarn ("duplicate `const'");
4601 if (volatilep > 1 && ! flag_isoc99)
4602 pedwarn ("duplicate `volatile'");
4603 if (restrictp > 1 && ! flag_isoc99)
4604 pedwarn ("duplicate `restrict'");
4606 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4607 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4608 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4611 declarator = TREE_OPERAND (declarator, 0);
4618 /* Now TYPE has the actual type. */
4620 /* Did array size calculations overflow? */
4622 if (TREE_CODE (type) == ARRAY_TYPE
4623 && COMPLETE_TYPE_P (type)
4624 && TREE_OVERFLOW (TYPE_SIZE (type)))
4626 error ("size of array `%s' is too large", name);
4627 /* If we proceed with the array type as it is, we'll eventually
4628 crash in tree_low_cst(). */
4629 type = error_mark_node;
4632 /* If this is declaring a typedef name, return a TYPE_DECL. */
4634 if (specbits & (1 << (int) RID_TYPEDEF))
4637 /* Note that the grammar rejects storage classes
4638 in typenames, fields or parameters */
4639 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4641 pedwarn ("ISO C forbids qualified function types");
4643 type = c_build_qualified_type (type, type_quals);
4644 decl = build_decl (TYPE_DECL, declarator, type);
4645 if ((specbits & (1 << (int) RID_SIGNED))
4646 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4647 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4648 decl_attributes (&decl, returned_attrs, 0);
4652 /* Detect the case of an array type of unspecified size
4653 which came, as such, direct from a typedef name.
4654 We must copy the type, so that each identifier gets
4655 a distinct type, so that each identifier's size can be
4656 controlled separately by its own initializer. */
4658 if (type != 0 && typedef_type != 0
4659 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4660 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4662 type = build_array_type (TREE_TYPE (type), 0);
4664 C_TYPE_VARIABLE_SIZE (type) = 1;
4667 /* If this is a type name (such as, in a cast or sizeof),
4668 compute the type and return it now. */
4670 if (decl_context == TYPENAME)
4672 /* Note that the grammar rejects storage classes
4673 in typenames, fields or parameters */
4674 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4676 pedwarn ("ISO C forbids const or volatile function types");
4678 type = c_build_qualified_type (type, type_quals);
4679 decl_attributes (&type, returned_attrs, 0);
4683 /* Aside from typedefs and type names (handle above),
4684 `void' at top level (not within pointer)
4685 is allowed only in public variables.
4686 We don't complain about parms either, but that is because
4687 a better error message can be made later. */
4689 if (VOID_TYPE_P (type) && decl_context != PARM
4690 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4691 && ((specbits & (1 << (int) RID_EXTERN))
4692 || (current_binding_level == global_binding_level
4694 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4696 error ("variable or field `%s' declared void", name);
4697 type = integer_type_node;
4700 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4701 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4706 if (decl_context == PARM)
4708 tree type_as_written;
4711 /* A parameter declared as an array of T is really a pointer to T.
4712 One declared as a function is really a pointer to a function. */
4714 if (TREE_CODE (type) == ARRAY_TYPE)
4716 /* Transfer const-ness of array into that of type pointed to. */
4717 type = TREE_TYPE (type);
4719 type = c_build_qualified_type (type, type_quals);
4720 type = build_pointer_type (type);
4721 type_quals = TYPE_UNQUALIFIED;
4722 if (array_ptr_quals)
4724 tree new_ptr_quals, new_ptr_attrs;
4726 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4727 /* We don't yet implement attributes in this context. */
4728 if (new_ptr_attrs != NULL_TREE)
4729 warning ("attributes in parameter array declarator ignored");
4734 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4736 tree qualifier = TREE_VALUE (new_ptr_quals);
4738 if (C_IS_RESERVED_WORD (qualifier))
4740 if (C_RID_CODE (qualifier) == RID_CONST)
4742 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4744 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4754 error ("invalid type modifier within array declarator");
4756 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4757 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4758 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4762 else if (TREE_CODE (type) == FUNCTION_TYPE)
4764 if (pedantic && type_quals)
4765 pedwarn ("ISO C forbids qualified function types");
4767 type = c_build_qualified_type (type, type_quals);
4768 type = build_pointer_type (type);
4769 type_quals = TYPE_UNQUALIFIED;
4771 else if (type_quals)
4772 type = c_build_qualified_type (type, type_quals);
4774 type_as_written = type;
4776 decl = build_decl (PARM_DECL, declarator, type);
4778 C_DECL_VARIABLE_SIZE (decl) = 1;
4780 /* Compute the type actually passed in the parmlist,
4781 for the case where there is no prototype.
4782 (For example, shorts and chars are passed as ints.)
4783 When there is a prototype, this is overridden later. */
4785 if (type == error_mark_node)
4786 promoted_type = type;
4788 promoted_type = c_type_promotes_to (type);
4790 DECL_ARG_TYPE (decl) = promoted_type;
4791 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4793 else if (decl_context == FIELD)
4795 /* Structure field. It may not be a function. */
4797 if (TREE_CODE (type) == FUNCTION_TYPE)
4799 error ("field `%s' declared as a function", name);
4800 type = build_pointer_type (type);
4802 else if (TREE_CODE (type) != ERROR_MARK
4803 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4805 error ("field `%s' has incomplete type", name);
4806 type = error_mark_node;
4808 /* Move type qualifiers down to element of an array. */
4809 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4811 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4813 TYPE_DOMAIN (type));
4815 /* Leave the field const or volatile as well. */
4816 type_quals = TYPE_UNQUALIFIED;
4819 decl = build_decl (FIELD_DECL, declarator, type);
4820 DECL_NONADDRESSABLE_P (decl) = bitfield;
4823 C_DECL_VARIABLE_SIZE (decl) = 1;
4825 else if (TREE_CODE (type) == FUNCTION_TYPE)
4827 /* Every function declaration is "external"
4828 except for those which are inside a function body
4829 in which `auto' is used.
4830 That is a case not specified by ANSI C,
4831 and we use it for forward declarations for nested functions. */
4832 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4833 || current_binding_level == global_binding_level);
4835 if (specbits & (1 << (int) RID_AUTO)
4836 && (pedantic || current_binding_level == global_binding_level))
4837 pedwarn ("invalid storage class for function `%s'", name);
4838 if (specbits & (1 << (int) RID_REGISTER))
4839 error ("invalid storage class for function `%s'", name);
4840 /* Function declaration not at top level.
4841 Storage classes other than `extern' are not allowed
4842 and `extern' makes no difference. */
4843 if (current_binding_level != global_binding_level
4844 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4846 pedwarn ("invalid storage class for function `%s'", name);
4848 decl = build_decl (FUNCTION_DECL, declarator, type);
4849 decl = build_decl_attribute_variant (decl, decl_attr);
4851 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4852 ggc_alloc_cleared (sizeof (struct lang_decl));
4854 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4855 pedwarn ("ISO C forbids qualified function types");
4857 /* GNU C interprets a `volatile void' return type to indicate
4858 that the function does not return. */
4859 if ((type_quals & TYPE_QUAL_VOLATILE)
4860 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4861 warning ("`noreturn' function returns non-void value");
4864 DECL_EXTERNAL (decl) = 1;
4865 /* Record absence of global scope for `static' or `auto'. */
4867 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4870 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4872 /* Record presence of `inline', if it is reasonable. */
4873 if (MAIN_NAME_P (declarator))
4876 warning ("cannot inline function `main'");
4880 /* Assume that otherwise the function can be inlined. */
4881 DECL_DECLARED_INLINE_P (decl) = 1;
4883 /* Do not mark bare declarations as DECL_INLINE. Doing so
4884 in the presence of multiple declarations can result in
4885 the abstract origin pointing between the declarations,
4886 which will confuse dwarf2out. */
4889 DECL_INLINE (decl) = 1;
4890 if (specbits & (1 << (int) RID_EXTERN))
4891 current_extern_inline = 1;
4894 /* If -finline-functions, assume it can be inlined. This does
4895 two things: let the function be deferred until it is actually
4896 needed, and let dwarf2 know that the function is inlinable. */
4897 else if (flag_inline_trees == 2 && initialized)
4899 DECL_INLINE (decl) = 1;
4900 DECL_DECLARED_INLINE_P (decl) = 0;
4905 /* It's a variable. */
4906 /* An uninitialized decl with `extern' is a reference. */
4907 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4909 /* Move type qualifiers down to element of an array. */
4910 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4912 int saved_align = TYPE_ALIGN(type);
4913 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4915 TYPE_DOMAIN (type));
4916 TYPE_ALIGN (type) = saved_align;
4917 #if 0 /* Leave the variable const or volatile as well. */
4918 type_quals = TYPE_UNQUALIFIED;
4921 else if (type_quals)
4922 type = c_build_qualified_type (type, type_quals);
4924 decl = build_decl (VAR_DECL, declarator, type);
4926 C_DECL_VARIABLE_SIZE (decl) = 1;
4929 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4931 DECL_EXTERNAL (decl) = extern_ref;
4932 /* At top level, the presence of a `static' or `register' storage
4933 class specifier, or the absence of all storage class specifiers
4934 makes this declaration a definition (perhaps tentative). Also,
4935 the absence of both `static' and `register' makes it public. */
4936 if (current_binding_level == global_binding_level)
4940 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4941 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4943 /* Not at top level, only `static' makes a static definition. */
4946 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4947 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4951 /* Record `register' declaration for warnings on &
4952 and in case doing stupid register allocation. */
4954 if (specbits & (1 << (int) RID_REGISTER))
4955 DECL_REGISTER (decl) = 1;
4957 /* Record constancy and volatility. */
4958 c_apply_type_quals_to_decl (type_quals, decl);
4960 /* If a type has volatile components, it should be stored in memory.
4961 Otherwise, the fact that those components are volatile
4962 will be ignored, and would even crash the compiler. */
4963 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4964 c_mark_addressable (decl);
4966 decl_attributes (&decl, returned_attrs, 0);
4972 /* Decode the parameter-list info for a function type or function definition.
4973 The argument is the value returned by `get_parm_info' (or made in parse.y
4974 if there is an identifier list instead of a parameter decl list).
4975 These two functions are separate because when a function returns
4976 or receives functions then each is called multiple times but the order
4977 of calls is different. The last call to `grokparms' is always the one
4978 that contains the formal parameter names of a function definition.
4980 Store in `last_function_parms' a chain of the decls of parms.
4981 Also store in `last_function_parm_tags' a chain of the struct, union,
4982 and enum tags declared among the parms.
4984 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4986 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4987 a mere declaration. A nonempty identifier-list gets an error message
4988 when FUNCDEF_FLAG is zero. */
4991 grokparms (parms_info, funcdef_flag)
4995 tree first_parm = TREE_CHAIN (parms_info);
4997 last_function_parms = TREE_PURPOSE (parms_info);
4998 last_function_parm_tags = TREE_VALUE (parms_info);
5000 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5001 && !in_system_header)
5002 warning ("function declaration isn't a prototype");
5005 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5008 pedwarn ("parameter names (without types) in function declaration");
5010 last_function_parms = first_parm;
5017 /* We no longer test FUNCDEF_FLAG.
5018 If the arg types are incomplete in a declaration,
5019 they must include undefined tags.
5020 These tags can never be defined in the scope of the declaration,
5021 so the types can never be completed,
5022 and no call can be compiled successfully. */
5024 /* In a fcn definition, arg types must be complete. */
5027 for (parm = last_function_parms, typelt = first_parm;
5029 parm = TREE_CHAIN (parm))
5030 /* Skip over any enumeration constants declared here. */
5031 if (TREE_CODE (parm) == PARM_DECL)
5033 /* Barf if the parameter itself has an incomplete type. */
5034 tree type = TREE_VALUE (typelt);
5035 if (type == error_mark_node)
5037 if (!COMPLETE_TYPE_P (type))
5039 if (funcdef_flag && DECL_NAME (parm) != 0)
5040 error ("parameter `%s' has incomplete type",
5041 IDENTIFIER_POINTER (DECL_NAME (parm)));
5043 warning ("parameter has incomplete type");
5046 TREE_VALUE (typelt) = error_mark_node;
5047 TREE_TYPE (parm) = error_mark_node;
5051 /* This has been replaced by parm_tags_warning, which
5052 uses a more accurate criterion for what to warn
5056 /* Now warn if is a pointer to an incomplete type. */
5057 while (TREE_CODE (type) == POINTER_TYPE
5058 || TREE_CODE (type) == REFERENCE_TYPE)
5059 type = TREE_TYPE (type);
5060 type = TYPE_MAIN_VARIANT (type);
5061 if (!COMPLETE_TYPE_P (type))
5063 if (DECL_NAME (parm) != 0)
5064 warning ("parameter `%s' points to incomplete type",
5065 IDENTIFIER_POINTER (DECL_NAME (parm)));
5067 warning ("parameter points to incomplete type");
5071 typelt = TREE_CHAIN (typelt);
5078 /* Return a tree_list node with info on a parameter list just parsed.
5079 The TREE_PURPOSE is a chain of decls of those parms.
5080 The TREE_VALUE is a list of structure, union and enum tags defined.
5081 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5082 This tree_list node is later fed to `grokparms'.
5084 VOID_AT_END nonzero means append `void' to the end of the type-list.
5085 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5088 get_parm_info (void_at_end)
5094 tree tags = gettags ();
5095 tree parms = getdecls ();
5097 tree order = current_binding_level->parm_order;
5099 /* Just `void' (and no ellipsis) is special. There are really no parms.
5100 But if the `void' is qualified (by `const' or `volatile') or has a
5101 storage class specifier (`register'), then the behavior is undefined;
5102 by not counting it as the special case of `void' we will cause an
5103 error later. Typedefs for `void' are OK (see DR#157). */
5104 if (void_at_end && parms != 0
5105 && TREE_CHAIN (parms) == 0
5106 && VOID_TYPE_P (TREE_TYPE (parms))
5107 && ! TREE_THIS_VOLATILE (parms)
5108 && ! TREE_READONLY (parms)
5109 && ! DECL_REGISTER (parms)
5110 && DECL_NAME (parms) == 0)
5113 storedecls (NULL_TREE);
5114 return tree_cons (NULL_TREE, NULL_TREE,
5115 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5118 /* Extract enumerator values and other non-parms declared with the parms.
5119 Likewise any forward parm decls that didn't have real parm decls. */
5120 for (decl = parms; decl;)
5122 tree next = TREE_CHAIN (decl);
5124 if (TREE_CODE (decl) != PARM_DECL)
5126 TREE_CHAIN (decl) = new_parms;
5129 else if (TREE_ASM_WRITTEN (decl))
5131 error_with_decl (decl,
5132 "parameter `%s' has just a forward declaration");
5133 TREE_CHAIN (decl) = new_parms;
5139 /* Put the parm decls back in the order they were in in the parm list. */
5140 for (t = order; t; t = TREE_CHAIN (t))
5143 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5145 TREE_CHAIN (TREE_VALUE (t)) = 0;
5148 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5151 /* Store the parmlist in the binding level since the old one
5152 is no longer a valid list. (We have changed the chain pointers.) */
5153 storedecls (new_parms);
5155 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5156 /* There may also be declarations for enumerators if an enumeration
5157 type is declared among the parms. Ignore them here. */
5158 if (TREE_CODE (decl) == PARM_DECL)
5160 /* Since there is a prototype,
5161 args are passed in their declared types. */
5162 tree type = TREE_TYPE (decl);
5163 DECL_ARG_TYPE (decl) = type;
5164 if (PROMOTE_PROTOTYPES
5165 && INTEGRAL_TYPE_P (type)
5166 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5167 DECL_ARG_TYPE (decl) = integer_type_node;
5169 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5170 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5171 && DECL_NAME (decl) == 0)
5173 error ("`void' in parameter list must be the entire list");
5179 return tree_cons (new_parms, tags,
5180 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5182 return tree_cons (new_parms, tags, nreverse (types));
5185 /* At end of parameter list, warn about any struct, union or enum tags
5186 defined within. Do so because these types cannot ever become complete. */
5189 parmlist_tags_warning ()
5194 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5196 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5197 /* An anonymous union parm type is meaningful as a GNU extension.
5198 So don't warn for that. */
5199 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5201 if (TREE_PURPOSE (elt) != 0)
5203 if (code == RECORD_TYPE)
5204 warning ("`struct %s' declared inside parameter list",
5205 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5206 else if (code == UNION_TYPE)
5207 warning ("`union %s' declared inside parameter list",
5208 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5210 warning ("`enum %s' declared inside parameter list",
5211 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5215 /* For translation these need to be separate warnings */
5216 if (code == RECORD_TYPE)
5217 warning ("anonymous struct declared inside parameter list");
5218 else if (code == UNION_TYPE)
5219 warning ("anonymous union declared inside parameter list");
5221 warning ("anonymous enum declared inside parameter list");
5225 warning ("its scope is only this definition or declaration, which is probably not what you want");
5231 /* Get the struct, enum or union (CODE says which) with tag NAME.
5232 Define the tag as a forward-reference if it is not defined. */
5235 xref_tag (code, name)
5236 enum tree_code code;
5239 /* If a cross reference is requested, look up the type
5240 already defined for this tag and return it. */
5242 tree ref = lookup_tag (code, name, current_binding_level, 0);
5243 /* If this is the right type of tag, return what we found.
5244 (This reference will be shadowed by shadow_tag later if appropriate.)
5245 If this is the wrong type of tag, do not return it. If it was the
5246 wrong type in the same binding level, we will have had an error
5247 message already; if in a different binding level and declaring
5248 a name, pending_xref_error will give an error message; but if in a
5249 different binding level and not declaring a name, this tag should
5250 shadow the previous declaration of a different type of tag, and
5251 this would not work properly if we return the reference found.
5252 (For example, with "struct foo" in an outer scope, "union foo;"
5253 must shadow that tag with a new one of union type.) */
5254 if (ref && TREE_CODE (ref) == code)
5257 /* If no such tag is yet defined, create a forward-reference node
5258 and record it as the "definition".
5259 When a real declaration of this type is found,
5260 the forward-reference will be altered into a real type. */
5262 ref = make_node (code);
5263 if (code == ENUMERAL_TYPE)
5265 /* Give the type a default layout like unsigned int
5266 to avoid crashing if it does not get defined. */
5267 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5268 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5269 TYPE_USER_ALIGN (ref) = 0;
5270 TREE_UNSIGNED (ref) = 1;
5271 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5272 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5273 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5276 pushtag (name, ref);
5281 /* Make sure that the tag NAME is defined *in the current binding level*
5282 at least as a forward reference.
5283 CODE says which kind of tag NAME ought to be. */
5286 start_struct (code, name)
5287 enum tree_code code;
5290 /* If there is already a tag defined at this binding level
5291 (as a forward reference), just return it. */
5296 ref = lookup_tag (code, name, current_binding_level, 1);
5297 if (ref && TREE_CODE (ref) == code)
5299 C_TYPE_BEING_DEFINED (ref) = 1;
5300 TYPE_PACKED (ref) = flag_pack_struct;
5301 if (TYPE_FIELDS (ref))
5303 if (code == UNION_TYPE)
5304 error ("redefinition of `union %s'",
5305 IDENTIFIER_POINTER (name));
5307 error ("redefinition of `struct %s'",
5308 IDENTIFIER_POINTER (name));
5314 /* Otherwise create a forward-reference just so the tag is in scope. */
5316 ref = make_node (code);
5317 pushtag (name, ref);
5318 C_TYPE_BEING_DEFINED (ref) = 1;
5319 TYPE_PACKED (ref) = flag_pack_struct;
5323 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5324 of a structure component, returning a FIELD_DECL node.
5325 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5327 This is done during the parsing of the struct declaration.
5328 The FIELD_DECL nodes are chained together and the lot of them
5329 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5332 grokfield (filename, line, declarator, declspecs, width)
5333 const char *filename ATTRIBUTE_UNUSED;
5334 int line ATTRIBUTE_UNUSED;
5335 tree declarator, declspecs, width;
5339 if (declarator == NULL_TREE && width == NULL_TREE)
5341 /* This is an unnamed decl. We only support unnamed
5342 structs/unions, so check for other things and refuse them. */
5343 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5344 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5346 error ("unnamed fields of type other than struct or union are not allowed");
5351 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5353 finish_decl (value, NULL_TREE, NULL_TREE);
5354 DECL_INITIAL (value) = width;
5356 maybe_objc_check_decl (value);
5360 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5361 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5362 ATTRIBUTES are attributes to be applied to the structure. */
5365 finish_struct (t, fieldlist, attributes)
5371 int toplevel = global_binding_level == current_binding_level;
5372 int saw_named_field;
5374 /* If this type was previously laid out as a forward reference,
5375 make sure we lay it out again. */
5379 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5381 /* Nameless union parm types are useful as GCC extension. */
5382 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5383 /* Otherwise, warn about any struct or union def. in parmlist. */
5384 if (in_parm_level_p ())
5387 pedwarn ("%s defined inside parms",
5388 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5390 warning ("%s defined inside parms",
5391 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5396 for (x = fieldlist; x; x = TREE_CHAIN (x))
5397 if (DECL_NAME (x) != 0)
5401 pedwarn ("%s has no %s",
5402 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5403 fieldlist ? _("named members") : _("members"));
5406 /* Install struct as DECL_CONTEXT of each field decl.
5407 Also process specified field sizes,m which is found in the DECL_INITIAL.
5408 Store 0 there, except for ": 0" fields (so we can find them
5409 and delete them, below). */
5411 saw_named_field = 0;
5412 for (x = fieldlist; x; x = TREE_CHAIN (x))
5414 DECL_CONTEXT (x) = t;
5415 DECL_PACKED (x) |= TYPE_PACKED (t);
5417 /* If any field is const, the structure type is pseudo-const. */
5418 if (TREE_READONLY (x))
5419 C_TYPE_FIELDS_READONLY (t) = 1;
5422 /* A field that is pseudo-const makes the structure likewise. */
5423 tree t1 = TREE_TYPE (x);
5424 while (TREE_CODE (t1) == ARRAY_TYPE)
5425 t1 = TREE_TYPE (t1);
5426 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5427 && C_TYPE_FIELDS_READONLY (t1))
5428 C_TYPE_FIELDS_READONLY (t) = 1;
5431 /* Any field that is volatile means variables of this type must be
5432 treated in some ways as volatile. */
5433 if (TREE_THIS_VOLATILE (x))
5434 C_TYPE_FIELDS_VOLATILE (t) = 1;
5436 /* Any field of nominal variable size implies structure is too. */
5437 if (C_DECL_VARIABLE_SIZE (x))
5438 C_TYPE_VARIABLE_SIZE (t) = 1;
5440 /* Detect invalid nested redefinition. */
5441 if (TREE_TYPE (x) == t)
5442 error ("nested redefinition of `%s'",
5443 IDENTIFIER_POINTER (TYPE_NAME (t)));
5445 /* Detect invalid bit-field size. */
5446 if (DECL_INITIAL (x))
5447 STRIP_NOPS (DECL_INITIAL (x));
5448 if (DECL_INITIAL (x))
5450 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5451 constant_expression_warning (DECL_INITIAL (x));
5455 "bit-field `%s' width not an integer constant");
5456 DECL_INITIAL (x) = NULL;
5460 /* Detect invalid bit-field type. */
5461 if (DECL_INITIAL (x)
5462 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5463 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5464 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5466 error_with_decl (x, "bit-field `%s' has invalid type");
5467 DECL_INITIAL (x) = NULL;
5470 if (DECL_INITIAL (x) && pedantic
5471 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5472 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5473 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5474 /* Accept an enum that's equivalent to int or unsigned int. */
5475 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5476 && (TYPE_PRECISION (TREE_TYPE (x))
5477 == TYPE_PRECISION (integer_type_node))))
5478 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5480 /* Detect and ignore out of range field width and process valid
5482 if (DECL_INITIAL (x))
5485 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5486 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5488 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5489 error_with_decl (x, "negative width in bit-field `%s'");
5490 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5491 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5492 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5493 error_with_decl (x, "zero width for bit-field `%s'");
5496 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5497 unsigned HOST_WIDE_INT width
5498 = tree_low_cst (DECL_INITIAL (x), 1);
5500 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5501 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5502 TREE_UNSIGNED (TREE_TYPE (x)))
5504 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5505 TREE_UNSIGNED (TREE_TYPE (x))))))
5506 warning_with_decl (x,
5507 "`%s' is narrower than values of its type");
5509 DECL_SIZE (x) = bitsize_int (width);
5510 DECL_BIT_FIELD (x) = 1;
5511 SET_DECL_C_BIT_FIELD (x);
5514 && ! (* targetm.ms_bitfield_layout_p) (t))
5516 /* field size 0 => force desired amount of alignment. */
5517 #ifdef EMPTY_FIELD_BOUNDARY
5518 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5520 #ifdef PCC_BITFIELD_TYPE_MATTERS
5521 if (PCC_BITFIELD_TYPE_MATTERS)
5523 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5524 TYPE_ALIGN (TREE_TYPE (x)));
5525 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5532 else if (TREE_TYPE (x) != error_mark_node)
5534 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5535 : TYPE_ALIGN (TREE_TYPE (x)));
5537 /* Non-bit-fields are aligned for their type, except packed
5538 fields which require only BITS_PER_UNIT alignment. */
5539 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5540 if (! DECL_PACKED (x))
5541 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5544 DECL_INITIAL (x) = 0;
5546 /* Detect flexible array member in an invalid context. */
5547 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5548 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5549 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5550 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5552 if (TREE_CODE (t) == UNION_TYPE)
5553 error_with_decl (x, "flexible array member in union");
5554 else if (TREE_CHAIN (x) != NULL_TREE)
5555 error_with_decl (x, "flexible array member not at end of struct");
5556 else if (! saw_named_field)
5557 error_with_decl (x, "flexible array member in otherwise empty struct");
5560 saw_named_field = 1;
5563 /* Delete all duplicate fields from the fieldlist */
5564 for (x = fieldlist; x && TREE_CHAIN (x);)
5565 /* Anonymous fields aren't duplicates. */
5566 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5574 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5580 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5582 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5583 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5589 /* Now we have the nearly final fieldlist. Record it,
5590 then lay out the structure or union (including the fields). */
5592 TYPE_FIELDS (t) = fieldlist;
5596 /* Delete all zero-width bit-fields from the fieldlist */
5598 tree *fieldlistp = &fieldlist;
5600 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5601 *fieldlistp = TREE_CHAIN (*fieldlistp);
5603 fieldlistp = &TREE_CHAIN (*fieldlistp);
5606 /* Now we have the truly final field list.
5607 Store it in this type and in the variants. */
5609 TYPE_FIELDS (t) = fieldlist;
5611 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5613 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5614 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5615 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5616 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5619 /* If this was supposed to be a transparent union, but we can't
5620 make it one, warn and turn off the flag. */
5621 if (TREE_CODE (t) == UNION_TYPE
5622 && TYPE_TRANSPARENT_UNION (t)
5623 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5625 TYPE_TRANSPARENT_UNION (t) = 0;
5626 warning ("union cannot be made transparent");
5629 /* If this structure or union completes the type of any previous
5630 variable declaration, lay it out and output its rtl. */
5632 if (current_binding_level->n_incomplete != 0)
5635 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5637 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5638 && TREE_CODE (decl) != TYPE_DECL)
5640 layout_decl (decl, 0);
5641 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5642 maybe_objc_check_decl (decl);
5643 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5646 if (--current_binding_level->n_incomplete == 0)
5649 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5650 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5652 tree element = TREE_TYPE (decl);
5653 while (TREE_CODE (element) == ARRAY_TYPE)
5654 element = TREE_TYPE (element);
5657 layout_array_type (TREE_TYPE (decl));
5658 if (TREE_CODE (decl) != TYPE_DECL)
5660 layout_decl (decl, 0);
5661 maybe_objc_check_decl (decl);
5662 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5666 if (--current_binding_level->n_incomplete == 0)
5673 /* Finish debugging output for this type. */
5674 rest_of_type_compilation (t, toplevel);
5679 /* Lay out the type T, and its element type, and so on. */
5682 layout_array_type (t)
5685 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5686 layout_array_type (TREE_TYPE (t));
5690 /* Begin compiling the definition of an enumeration type.
5691 NAME is its name (or null if anonymous).
5692 Returns the type object, as yet incomplete.
5693 Also records info about it so that build_enumerator
5694 may be used to declare the individual values as they are read. */
5702 /* If this is the real definition for a previous forward reference,
5703 fill in the contents in the same object that used to be the
5704 forward reference. */
5707 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5709 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5711 enumtype = make_node (ENUMERAL_TYPE);
5712 pushtag (name, enumtype);
5715 C_TYPE_BEING_DEFINED (enumtype) = 1;
5717 if (TYPE_VALUES (enumtype) != 0)
5719 /* This enum is a named one that has been declared already. */
5720 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5722 /* Completely replace its old definition.
5723 The old enumerators remain defined, however. */
5724 TYPE_VALUES (enumtype) = 0;
5727 enum_next_value = integer_zero_node;
5730 if (flag_short_enums)
5731 TYPE_PACKED (enumtype) = 1;
5736 /* After processing and defining all the values of an enumeration type,
5737 install their decls in the enumeration type and finish it off.
5738 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5739 and ATTRIBUTES are the specified attributes.
5740 Returns ENUMTYPE. */
5743 finish_enum (enumtype, values, attributes)
5749 tree minnode = 0, maxnode = 0, enum_value_type;
5750 int precision, unsign;
5751 int toplevel = (global_binding_level == current_binding_level);
5753 if (in_parm_level_p ())
5754 warning ("enum defined inside parms");
5756 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5758 /* Calculate the maximum value of any enumerator in this type. */
5760 if (values == error_mark_node)
5761 minnode = maxnode = integer_zero_node;
5764 minnode = maxnode = TREE_VALUE (values);
5765 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5767 tree value = TREE_VALUE (pair);
5768 if (tree_int_cst_lt (maxnode, value))
5770 if (tree_int_cst_lt (value, minnode))
5775 /* Construct the final type of this enumeration. It is the same
5776 as one of the integral types - the narrowest one that fits, except
5777 that normally we only go as narrow as int - and signed iff any of
5778 the values are negative. */
5779 unsign = (tree_int_cst_sgn (minnode) >= 0);
5780 precision = MAX (min_precision (minnode, unsign),
5781 min_precision (maxnode, unsign));
5782 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5784 tree narrowest = c_common_type_for_size (precision, unsign);
5787 warning ("enumeration values exceed range of largest integer");
5788 narrowest = long_long_integer_type_node;
5791 precision = TYPE_PRECISION (narrowest);
5794 precision = TYPE_PRECISION (integer_type_node);
5796 if (precision == TYPE_PRECISION (integer_type_node))
5797 enum_value_type = c_common_type_for_size (precision, 0);
5799 enum_value_type = enumtype;
5801 TYPE_MIN_VALUE (enumtype) = minnode;
5802 TYPE_MAX_VALUE (enumtype) = maxnode;
5803 TYPE_PRECISION (enumtype) = precision;
5804 TREE_UNSIGNED (enumtype) = unsign;
5805 TYPE_SIZE (enumtype) = 0;
5806 layout_type (enumtype);
5808 if (values != error_mark_node)
5810 /* Change the type of the enumerators to be the enum type. We
5811 need to do this irrespective of the size of the enum, for
5812 proper type checking. Replace the DECL_INITIALs of the
5813 enumerators, and the value slots of the list, with copies
5814 that have the enum type; they cannot be modified in place
5815 because they may be shared (e.g. integer_zero_node) Finally,
5816 change the purpose slots to point to the names of the decls. */
5817 for (pair = values; pair; pair = TREE_CHAIN (pair))
5819 tree enu = TREE_PURPOSE (pair);
5821 TREE_TYPE (enu) = enumtype;
5822 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5823 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5824 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5825 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5826 DECL_MODE (enu) = TYPE_MODE (enumtype);
5828 /* The ISO C Standard mandates enumerators to have type int,
5829 even though the underlying type of an enum type is
5830 unspecified. Here we convert any enumerators that fit in
5831 an int to type int, to avoid promotions to unsigned types
5832 when comparing integers with enumerators that fit in the
5833 int range. When -pedantic is given, build_enumerator()
5834 would have already taken care of those that don't fit. */
5835 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5836 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5838 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5840 TREE_PURPOSE (pair) = DECL_NAME (enu);
5841 TREE_VALUE (pair) = DECL_INITIAL (enu);
5844 TYPE_VALUES (enumtype) = values;
5847 /* Fix up all variant types of this enum type. */
5848 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5850 if (tem == enumtype)
5852 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5853 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5854 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5855 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5856 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5857 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5858 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5859 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5860 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5861 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5864 /* Finish debugging output for this type. */
5865 rest_of_type_compilation (enumtype, toplevel);
5870 /* Build and install a CONST_DECL for one value of the
5871 current enumeration type (one that was begun with start_enum).
5872 Return a tree-list containing the CONST_DECL and its value.
5873 Assignment of sequential values by default is handled here. */
5876 build_enumerator (name, value)
5881 /* Validate and default VALUE. */
5883 /* Remove no-op casts from the value. */
5885 STRIP_TYPE_NOPS (value);
5889 if (TREE_CODE (value) == INTEGER_CST)
5891 value = default_conversion (value);
5892 constant_expression_warning (value);
5896 error ("enumerator value for `%s' not integer constant",
5897 IDENTIFIER_POINTER (name));
5902 /* Default based on previous value. */
5903 /* It should no longer be possible to have NON_LVALUE_EXPR
5907 value = enum_next_value;
5909 error ("overflow in enumeration values");
5912 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5914 pedwarn ("ISO C restricts enumerator values to range of `int'");
5915 value = convert (integer_type_node, value);
5918 /* Set basis for default for next value. */
5919 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5920 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5922 /* Now create a declaration for the enum value name. */
5924 type = TREE_TYPE (value);
5925 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5926 TYPE_PRECISION (integer_type_node)),
5927 (TYPE_PRECISION (type)
5928 >= TYPE_PRECISION (integer_type_node)
5929 && TREE_UNSIGNED (type)));
5931 decl = build_decl (CONST_DECL, name, type);
5932 DECL_INITIAL (decl) = convert (type, value);
5935 return tree_cons (decl, value, NULL_TREE);
5939 /* Create the FUNCTION_DECL for a function definition.
5940 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5941 the declaration; they describe the function's name and the type it returns,
5942 but twisted together in a fashion that parallels the syntax of C.
5944 This function creates a binding context for the function body
5945 as well as setting up the FUNCTION_DECL in current_function_decl.
5947 Returns 1 on success. If the DECLARATOR is not suitable for a function
5948 (it defines a datum instead), we return 0, which tells
5949 yyparse to report a parse error. */
5952 start_function (declspecs, declarator, attributes)
5953 tree declarator, declspecs, attributes;
5955 tree decl1, old_decl;
5957 int old_immediate_size_expand = immediate_size_expand;
5959 current_function_returns_value = 0; /* Assume, until we see it does. */
5960 current_function_returns_null = 0;
5961 current_function_returns_abnormally = 0;
5962 warn_about_return_type = 0;
5963 current_extern_inline = 0;
5964 c_function_varargs = 0;
5966 shadowed_labels = 0;
5968 /* Don't expand any sizes in the return type of the function. */
5969 immediate_size_expand = 0;
5971 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5973 /* If the declarator is not suitable for a function definition,
5974 cause a syntax error. */
5977 immediate_size_expand = old_immediate_size_expand;
5981 decl_attributes (&decl1, attributes, 0);
5983 /* If #pragma weak was used, mark the decl weak now. */
5984 if (current_binding_level == global_binding_level)
5985 maybe_apply_pragma_weak (decl1);
5987 if (DECL_DECLARED_INLINE_P (decl1)
5988 && DECL_UNINLINABLE (decl1)
5989 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
5990 warning_with_decl (decl1,
5991 "inline function `%s' given attribute noinline");
5993 announce_function (decl1);
5995 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
5997 error ("return type is an incomplete type");
5998 /* Make it return void instead. */
6000 = build_function_type (void_type_node,
6001 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6004 if (warn_about_return_type)
6005 pedwarn_c99 ("return type defaults to `int'");
6007 /* Save the parm names or decls from this function's declarator
6008 where store_parm_decls will find them. */
6009 current_function_parms = last_function_parms;
6010 current_function_parm_tags = last_function_parm_tags;
6012 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6013 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6014 DECL_INITIAL (decl1) = error_mark_node;
6016 /* If this definition isn't a prototype and we had a prototype declaration
6017 before, copy the arg type info from that prototype.
6018 But not if what we had before was a builtin function. */
6019 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6020 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6021 && !DECL_BUILT_IN (old_decl)
6022 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6023 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6024 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6026 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6027 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6028 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6031 /* If there is no explicit declaration, look for any out-of-scope implicit
6034 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6036 /* Optionally warn of old-fashioned def with no previous prototype. */
6037 if (warn_strict_prototypes
6038 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6040 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6041 || (DECL_BUILT_IN (old_decl)
6042 && ! C_DECL_ANTICIPATED (old_decl)))))
6043 warning ("function declaration isn't a prototype");
6044 /* Optionally warn of any global def with no previous prototype. */
6045 else if (warn_missing_prototypes
6046 && TREE_PUBLIC (decl1)
6048 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6049 || (DECL_BUILT_IN (old_decl)
6050 && ! C_DECL_ANTICIPATED (old_decl))))
6051 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6052 warning_with_decl (decl1, "no previous prototype for `%s'");
6053 /* Optionally warn of any def with no previous prototype
6054 if the function has already been used. */
6055 else if (warn_missing_prototypes
6056 && old_decl != 0 && TREE_USED (old_decl)
6057 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6058 warning_with_decl (decl1,
6059 "`%s' was used with no prototype before its definition");
6060 /* Optionally warn of any global def with no previous declaration. */
6061 else if (warn_missing_declarations
6062 && TREE_PUBLIC (decl1)
6064 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6065 warning_with_decl (decl1, "no previous declaration for `%s'");
6066 /* Optionally warn of any def with no previous declaration
6067 if the function has already been used. */
6068 else if (warn_missing_declarations
6069 && old_decl != 0 && TREE_USED (old_decl)
6070 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6071 warning_with_decl (decl1,
6072 "`%s' was used with no declaration before its definition");
6074 /* This is a definition, not a reference.
6075 So normally clear DECL_EXTERNAL.
6076 However, `extern inline' acts like a declaration
6077 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6078 DECL_EXTERNAL (decl1) = current_extern_inline;
6080 /* This function exists in static storage.
6081 (This does not mean `static' in the C sense!) */
6082 TREE_STATIC (decl1) = 1;
6084 /* A nested function is not global. */
6085 if (current_function_decl != 0)
6086 TREE_PUBLIC (decl1) = 0;
6088 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6089 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6094 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6095 != integer_type_node)
6096 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6098 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6099 args = TREE_CHAIN (args))
6101 tree type = args ? TREE_VALUE (args) : 0;
6103 if (type == void_type_node)
6110 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6111 pedwarn_with_decl (decl1,
6112 "first argument of `%s' should be `int'");
6116 if (TREE_CODE (type) != POINTER_TYPE
6117 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6118 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6120 pedwarn_with_decl (decl1,
6121 "second argument of `%s' should be `char **'");
6125 if (TREE_CODE (type) != POINTER_TYPE
6126 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6127 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6129 pedwarn_with_decl (decl1,
6130 "third argument of `%s' should probably be `char **'");
6135 /* It is intentional that this message does not mention the third
6136 argument because it's only mentioned in an appendix of the
6138 if (argct > 0 && (argct < 2 || argct > 3))
6139 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6141 if (! TREE_PUBLIC (decl1))
6142 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6145 /* Record the decl so that the function name is defined.
6146 If we already have a decl for this name, and it is a FUNCTION_DECL,
6147 use the old decl. */
6149 current_function_decl = pushdecl (decl1);
6152 declare_parm_level (1);
6153 current_binding_level->subblocks_tag_transparent = 1;
6155 make_decl_rtl (current_function_decl, NULL);
6157 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6158 /* Promote the value to int before returning it. */
6159 if (c_promoting_integer_type_p (restype))
6161 /* It retains unsignedness if not really getting wider. */
6162 if (TREE_UNSIGNED (restype)
6163 && (TYPE_PRECISION (restype)
6164 == TYPE_PRECISION (integer_type_node)))
6165 restype = unsigned_type_node;
6167 restype = integer_type_node;
6169 DECL_RESULT (current_function_decl)
6170 = build_decl (RESULT_DECL, NULL_TREE, restype);
6172 /* If this fcn was already referenced via a block-scope `extern' decl
6173 (or an implicit decl), propagate certain information about the usage. */
6174 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6175 TREE_ADDRESSABLE (current_function_decl) = 1;
6177 immediate_size_expand = old_immediate_size_expand;
6179 start_fname_decls ();
6184 /* Record that this function is going to be a varargs function.
6185 This is called before store_parm_decls, which is too early
6186 to call mark_varargs directly. */
6191 c_function_varargs = 1;
6194 /* Store the parameter declarations into the current function declaration.
6195 This is called after parsing the parameter declarations, before
6196 digesting the body of the function.
6198 For an old-style definition, modify the function's type
6199 to specify at least the number of arguments. */
6204 tree fndecl = current_function_decl;
6207 /* This is either a chain of PARM_DECLs (if a prototype was used)
6208 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6209 tree specparms = current_function_parms;
6211 /* This is a list of types declared among parms in a prototype. */
6212 tree parmtags = current_function_parm_tags;
6214 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6215 tree parmdecls = getdecls ();
6217 /* This is a chain of any other decls that came in among the parm
6218 declarations. If a parm is declared with enum {foo, bar} x;
6219 then CONST_DECLs for foo and bar are put here. */
6222 /* The function containing FNDECL, if any. */
6223 tree context = decl_function_context (fndecl);
6225 /* Nonzero if this definition is written with a prototype. */
6228 int saved_warn_shadow = warn_shadow;
6230 /* Don't re-emit shadow warnings. */
6233 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6235 /* This case is when the function was defined with an ANSI prototype.
6236 The parms already have decls, so we need not do anything here
6237 except record them as in effect
6238 and complain if any redundant old-style parm decls were written. */
6249 error_with_decl (fndecl,
6250 "parm types given both in parmlist and separately");
6251 /* Get rid of the erroneous decls; don't keep them on
6252 the list of parms, since they might not be PARM_DECLs. */
6253 for (decl = current_binding_level->names;
6254 decl; decl = TREE_CHAIN (decl))
6255 if (DECL_NAME (decl))
6256 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6257 for (link = current_binding_level->shadowed;
6258 link; link = TREE_CHAIN (link))
6259 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6260 current_binding_level->names = 0;
6261 current_binding_level->shadowed = 0;
6264 specparms = nreverse (specparms);
6265 for (parm = specparms; parm; parm = next)
6267 next = TREE_CHAIN (parm);
6268 if (TREE_CODE (parm) == PARM_DECL)
6270 if (DECL_NAME (parm) == 0)
6271 error_with_decl (parm, "parameter name omitted");
6272 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6273 && VOID_TYPE_P (TREE_TYPE (parm)))
6275 error_with_decl (parm, "parameter `%s' declared void");
6276 /* Change the type to error_mark_node so this parameter
6277 will be ignored by assign_parms. */
6278 TREE_TYPE (parm) = error_mark_node;
6284 /* If we find an enum constant or a type tag,
6285 put it aside for the moment. */
6286 TREE_CHAIN (parm) = 0;
6287 others = chainon (others, parm);
6291 /* Get the decls in their original chain order
6292 and record in the function. */
6293 DECL_ARGUMENTS (fndecl) = getdecls ();
6296 /* If this function takes a variable number of arguments,
6297 add a phony parameter to the end of the parm list,
6298 to represent the position of the first unnamed argument. */
6299 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6302 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6303 /* Let's hope the address of the unnamed parm
6304 won't depend on its type. */
6305 TREE_TYPE (dummy) = integer_type_node;
6306 DECL_ARG_TYPE (dummy) = integer_type_node;
6307 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6311 /* Now pushdecl the enum constants. */
6312 for (parm = others; parm; parm = next)
6314 next = TREE_CHAIN (parm);
6315 if (DECL_NAME (parm) == 0)
6317 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6319 else if (TREE_CODE (parm) != PARM_DECL)
6323 storetags (chainon (parmtags, gettags ()));
6327 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6328 each with a parm name as the TREE_VALUE.
6330 PARMDECLS is a chain of declarations for parameters.
6331 Warning! It can also contain CONST_DECLs which are not parameters
6332 but are names of enumerators of any enum types
6333 declared among the parameters.
6335 First match each formal parameter name with its declaration.
6336 Associate decls with the names and store the decls
6337 into the TREE_PURPOSE slots. */
6339 /* We use DECL_WEAK as a flag to show which parameters have been
6340 seen already since it is not used on PARM_DECL or CONST_DECL. */
6341 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6342 DECL_WEAK (parm) = 0;
6344 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6346 tree tail, found = NULL;
6348 if (TREE_VALUE (parm) == 0)
6350 error_with_decl (fndecl,
6351 "parameter name missing from parameter list");
6352 TREE_PURPOSE (parm) = 0;
6356 /* See if any of the parmdecls specifies this parm by name.
6357 Ignore any enumerator decls. */
6358 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6359 if (DECL_NAME (tail) == TREE_VALUE (parm)
6360 && TREE_CODE (tail) == PARM_DECL)
6366 /* If declaration already marked, we have a duplicate name.
6367 Complain, and don't use this decl twice. */
6368 if (found && DECL_WEAK (found))
6370 error_with_decl (found, "multiple parameters named `%s'");
6374 /* If the declaration says "void", complain and ignore it. */
6375 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6377 error_with_decl (found, "parameter `%s' declared void");
6378 TREE_TYPE (found) = integer_type_node;
6379 DECL_ARG_TYPE (found) = integer_type_node;
6380 layout_decl (found, 0);
6383 /* If no declaration found, default to int. */
6386 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6388 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6389 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6390 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6392 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6393 else if (extra_warnings)
6394 warning_with_decl (found, "type of `%s' defaults to `int'");
6398 TREE_PURPOSE (parm) = found;
6400 /* Mark this decl as "already found". */
6401 DECL_WEAK (found) = 1;
6404 /* Put anything which is on the parmdecls chain and which is
6405 not a PARM_DECL onto the list NONPARMS. (The types of
6406 non-parm things which might appear on the list include
6407 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6408 any actual PARM_DECLs not matched with any names. */
6411 for (parm = parmdecls; parm;)
6413 tree next = TREE_CHAIN (parm);
6414 TREE_CHAIN (parm) = 0;
6416 if (TREE_CODE (parm) != PARM_DECL)
6417 nonparms = chainon (nonparms, parm);
6420 /* Complain about args with incomplete types. */
6421 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6423 error_with_decl (parm, "parameter `%s' has incomplete type");
6424 TREE_TYPE (parm) = error_mark_node;
6427 if (! DECL_WEAK (parm))
6429 error_with_decl (parm,
6430 "declaration for parameter `%s' but no such parameter");
6431 /* Pretend the parameter was not missing.
6432 This gets us to a standard state and minimizes
6433 further error messages. */
6435 = chainon (specparms,
6436 tree_cons (parm, NULL_TREE, NULL_TREE));
6443 /* Chain the declarations together in the order of the list of
6444 names. Store that chain in the function decl, replacing the
6447 DECL_ARGUMENTS (fndecl) = 0;
6450 for (last = 0; parm; parm = TREE_CHAIN (parm))
6451 if (TREE_PURPOSE (parm))
6454 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6456 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6457 last = TREE_PURPOSE (parm);
6458 TREE_CHAIN (last) = 0;
6462 /* If there was a previous prototype,
6463 set the DECL_ARG_TYPE of each argument according to
6464 the type previously specified, and report any mismatches. */
6466 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6469 for (parm = DECL_ARGUMENTS (fndecl),
6470 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6471 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6472 != void_type_node));
6473 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6475 if (parm == 0 || type == 0
6476 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6478 error ("number of arguments doesn't match prototype");
6479 error_with_file_and_line (current_function_prototype_file,
6480 current_function_prototype_line,
6481 "prototype declaration");
6484 /* Type for passing arg must be consistent with that
6485 declared for the arg. ISO C says we take the unqualified
6486 type for parameters declared with qualified type. */
6487 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6488 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6490 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6491 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6493 /* Adjust argument to match prototype. E.g. a previous
6494 `int foo(float);' prototype causes
6495 `int foo(x) float x; {...}' to be treated like
6496 `int foo(float x) {...}'. This is particularly
6497 useful for argument types like uid_t. */
6498 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6500 if (PROMOTE_PROTOTYPES
6501 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6502 && TYPE_PRECISION (TREE_TYPE (parm))
6503 < TYPE_PRECISION (integer_type_node))
6504 DECL_ARG_TYPE (parm) = integer_type_node;
6508 pedwarn ("promoted argument `%s' doesn't match prototype",
6509 IDENTIFIER_POINTER (DECL_NAME (parm)));
6510 warning_with_file_and_line
6511 (current_function_prototype_file,
6512 current_function_prototype_line,
6513 "prototype declaration");
6518 error ("argument `%s' doesn't match prototype",
6519 IDENTIFIER_POINTER (DECL_NAME (parm)));
6520 error_with_file_and_line (current_function_prototype_file,
6521 current_function_prototype_line,
6522 "prototype declaration");
6526 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6529 /* Otherwise, create a prototype that would match. */
6533 tree actual = 0, last = 0, type;
6535 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6537 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6539 TREE_CHAIN (last) = type;
6544 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6546 TREE_CHAIN (last) = type;
6550 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6551 of the type of this function, but we need to avoid having this
6552 affect the types of other similarly-typed functions, so we must
6553 first force the generation of an identical (but separate) type
6554 node for the relevant function type. The new node we create
6555 will be a variant of the main variant of the original function
6558 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6560 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6563 /* Now store the final chain of decls for the arguments
6564 as the decl-chain of the current lexical scope.
6565 Put the enumerators in as well, at the front so that
6566 DECL_ARGUMENTS is not modified. */
6568 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6571 /* Make sure the binding level for the top of the function body
6572 gets a BLOCK if there are any in the function.
6573 Otherwise, the dbx output is wrong. */
6575 keep_next_if_subblocks = 1;
6577 /* ??? This might be an improvement,
6578 but needs to be thought about some more. */
6580 keep_next_level_flag = 1;
6583 /* Write a record describing this function definition to the prototypes
6584 file (if requested). */
6586 gen_aux_info_record (fndecl, 1, 0, prototype);
6588 /* Initialize the RTL code for the function. */
6589 init_function_start (fndecl, input_filename, lineno);
6591 /* Begin the statement tree for this function. */
6592 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6594 /* If this is a nested function, save away the sizes of any
6595 variable-size types so that we can expand them when generating
6601 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6602 = nreverse (get_pending_sizes ());
6603 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6606 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6609 /* This function is being processed in whole-function mode. */
6610 cfun->x_whole_function_mode_p = 1;
6612 /* Even though we're inside a function body, we still don't want to
6613 call expand_expr to calculate the size of a variable-sized array.
6614 We haven't necessarily assigned RTL to all variables yet, so it's
6615 not safe to try to expand expressions involving them. */
6616 immediate_size_expand = 0;
6617 cfun->x_dont_save_pending_sizes_p = 1;
6619 warn_shadow = saved_warn_shadow;
6622 /* Finish up a function declaration and compile that function
6623 all the way to assembler language output. The free the storage
6624 for the function definition.
6626 This is called after parsing the body of the function definition.
6628 NESTED is nonzero if the function being finished is nested in another.
6629 CAN_DEFER_P is nonzero if the function may be deferred. */
6632 finish_function (nested, can_defer_p)
6636 tree fndecl = current_function_decl;
6639 /* This caused &foo to be of type ptr-to-const-function which then
6640 got a warning when stored in a ptr-to-function variable. */
6641 TREE_READONLY (fndecl) = 1;
6645 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6647 /* Must mark the RESULT_DECL as being in this function. */
6649 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6651 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6653 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6654 != integer_type_node)
6656 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6657 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6659 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6663 #ifdef DEFAULT_MAIN_RETURN
6664 /* Make it so that `main' always returns success by default. */
6665 DEFAULT_MAIN_RETURN;
6668 c_expand_return (integer_zero_node);
6673 finish_fname_decls ();
6675 /* Tie off the statement tree for this function. */
6676 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6678 /* Complain if there's just no return statement. */
6679 if (warn_return_type
6680 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6681 && !current_function_returns_value && !current_function_returns_null
6682 /* Don't complain if we abort. */
6683 && !current_function_returns_abnormally
6684 /* Don't warn for main(). */
6685 && !MAIN_NAME_P (DECL_NAME (fndecl))
6686 /* Or if they didn't actually specify a return type. */
6687 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6688 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6689 inline function, as we might never be compiled separately. */
6690 && DECL_INLINE (fndecl))
6691 warning ("no return statement in function returning non-void");
6693 /* Clear out memory we no longer need. */
6694 free_after_parsing (cfun);
6695 /* Since we never call rest_of_compilation, we never clear
6696 CFUN. Do so explicitly. */
6697 free_after_compilation (cfun);
6702 /* Generate RTL for the body of this function. */
6703 c_expand_body (fndecl, nested, can_defer_p);
6705 /* Let the error reporting routines know that we're outside a
6706 function. For a nested function, this value is used in
6707 c_pop_function_context and then reset via pop_function_context. */
6708 current_function_decl = NULL;
6712 /* Generate the RTL for a deferred function FNDECL. */
6715 c_expand_deferred_function (fndecl)
6718 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6719 function was deferred, e.g. in duplicate_decls. */
6720 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6722 c_expand_body (fndecl, 0, 0);
6723 current_function_decl = NULL;
6727 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6728 then we are already in the process of generating RTL for another
6729 function. If can_defer_p is zero, we won't attempt to defer the
6730 generation of RTL. */
6733 c_expand_body (fndecl, nested_p, can_defer_p)
6735 int nested_p, can_defer_p;
6737 int uninlinable = 1;
6739 /* There's no reason to do any of the work here if we're only doing
6740 semantic analysis; this code just generates RTL. */
6741 if (flag_syntax_only)
6744 if (flag_inline_trees)
6746 /* First, cache whether the current function is inlinable. Some
6747 predicates depend on cfun and current_function_decl to
6748 function completely. */
6749 timevar_push (TV_INTEGRATION);
6750 uninlinable = ! tree_inlinable_function_p (fndecl);
6752 if (! uninlinable && can_defer_p
6753 /* Save function tree for inlining. Should return 0 if the
6754 language does not support function deferring or the
6755 function could not be deferred. */
6756 && defer_fn (fndecl))
6758 /* Let the back-end know that this function exists. */
6759 (*debug_hooks->deferred_inline_function) (fndecl);
6760 timevar_pop (TV_INTEGRATION);
6764 /* Then, inline any functions called in it. */
6765 optimize_inline_calls (fndecl);
6766 timevar_pop (TV_INTEGRATION);
6769 timevar_push (TV_EXPAND);
6773 /* Make sure that we will evaluate variable-sized types involved
6774 in our function's type. */
6775 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6776 /* Squirrel away our current state. */
6777 push_function_context ();
6780 /* Initialize the RTL code for the function. */
6781 current_function_decl = fndecl;
6782 input_filename = DECL_SOURCE_FILE (fndecl);
6783 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6785 /* This function is being processed in whole-function mode. */
6786 cfun->x_whole_function_mode_p = 1;
6788 /* Even though we're inside a function body, we still don't want to
6789 call expand_expr to calculate the size of a variable-sized array.
6790 We haven't necessarily assigned RTL to all variables yet, so it's
6791 not safe to try to expand expressions involving them. */
6792 immediate_size_expand = 0;
6793 cfun->x_dont_save_pending_sizes_p = 1;
6795 /* If this is a varargs function, inform function.c. */
6796 if (c_function_varargs)
6799 /* Set up parameters and prepare for return, for the function. */
6800 expand_function_start (fndecl, 0);
6802 /* If this function is `main', emit a call to `__main'
6803 to run global initializers, etc. */
6804 if (DECL_NAME (fndecl)
6805 && MAIN_NAME_P (DECL_NAME (fndecl))
6806 && DECL_CONTEXT (fndecl) == NULL_TREE)
6807 expand_main_function ();
6809 /* Generate the RTL for this function. */
6810 expand_stmt (DECL_SAVED_TREE (fndecl));
6813 /* Allow the body of the function to be garbage collected. */
6814 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6817 /* We hard-wired immediate_size_expand to zero above.
6818 expand_function_end will decrement this variable. So, we set the
6819 variable to one here, so that after the decrement it will remain
6821 immediate_size_expand = 1;
6823 /* Allow language dialects to perform special processing. */
6824 if (lang_expand_function_end)
6825 (*lang_expand_function_end) ();
6827 /* Generate rtl for function exit. */
6828 expand_function_end (input_filename, lineno, 0);
6830 /* If this is a nested function, protect the local variables in the stack
6831 above us from being collected while we're compiling this function. */
6833 ggc_push_context ();
6835 /* Run the optimizers and output the assembler code for this function. */
6836 rest_of_compilation (fndecl);
6838 /* Undo the GC context switch. */
6842 /* With just -W, complain only if function returns both with
6843 and without a value. */
6845 && current_function_returns_value
6846 && current_function_returns_null)
6847 warning ("this function may return with or without a value");
6849 /* If requested, warn about function definitions where the function will
6850 return a value (usually of some struct or union type) which itself will
6851 take up a lot of stack space. */
6853 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6855 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6857 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6858 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6859 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6862 unsigned int size_as_int
6863 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6865 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6866 warning_with_decl (fndecl,
6867 "size of return value of `%s' is %u bytes",
6870 warning_with_decl (fndecl,
6871 "size of return value of `%s' is larger than %d bytes",
6876 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6877 && ! flag_inline_trees)
6879 /* Stop pointing to the local nodes about to be freed.
6880 But DECL_INITIAL must remain nonzero so we know this
6881 was an actual function definition.
6882 For a nested function, this is done in c_pop_function_context.
6883 If rest_of_compilation set this to 0, leave it 0. */
6884 if (DECL_INITIAL (fndecl) != 0)
6885 DECL_INITIAL (fndecl) = error_mark_node;
6887 DECL_ARGUMENTS (fndecl) = 0;
6890 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6892 if (targetm.have_ctors_dtors)
6893 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6894 DEFAULT_INIT_PRIORITY);
6896 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6899 if (DECL_STATIC_DESTRUCTOR (fndecl))
6901 if (targetm.have_ctors_dtors)
6902 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6903 DEFAULT_INIT_PRIORITY);
6905 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6909 /* Return to the enclosing function. */
6910 pop_function_context ();
6911 timevar_pop (TV_EXPAND);
6914 /* Check the declarations given in a for-loop for satisfying the C99
6917 check_for_loop_decls ()
6923 /* If we get here, declarations have been used in a for loop without
6924 the C99 for loop scope. This doesn't make much sense, so don't
6926 error ("`for' loop initial declaration used outside C99 mode");
6929 /* C99 subclause 6.8.5 paragraph 3:
6931 [#3] The declaration part of a for statement shall only
6932 declare identifiers for objects having storage class auto or
6935 It isn't clear whether, in this sentence, "identifiers" binds to
6936 "shall only declare" or to "objects" - that is, whether all identifiers
6937 declared must be identifiers for objects, or whether the restriction
6938 only applies to those that are. (A question on this in comp.std.c
6939 in November 2000 received no answer.) We implement the strictest
6940 interpretation, to avoid creating an extension which later causes
6943 for (t = gettags (); t; t = TREE_CHAIN (t))
6945 if (TREE_PURPOSE (t) != 0)
6947 enum tree_code code = TREE_CODE (TREE_VALUE (t));
6949 if (code == RECORD_TYPE)
6950 error ("`struct %s' declared in `for' loop initial declaration",
6951 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6952 else if (code == UNION_TYPE)
6953 error ("`union %s' declared in `for' loop initial declaration",
6954 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6956 error ("`enum %s' declared in `for' loop initial declaration",
6957 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
6961 for (t = getdecls (); t; t = TREE_CHAIN (t))
6963 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
6964 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
6965 else if (TREE_STATIC (t))
6966 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
6967 else if (DECL_EXTERNAL (t))
6968 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
6972 /* Save and restore the variables in this file and elsewhere
6973 that keep track of the progress of compilation of the current function.
6974 Used for nested functions. */
6976 struct c_language_function
6978 struct language_function base;
6980 tree shadowed_labels;
6983 int returns_abnormally;
6984 int warn_about_return_type;
6986 struct binding_level *binding_level;
6989 /* Save and reinitialize the variables
6990 used during compilation of a C function. */
6993 c_push_function_context (f)
6996 struct c_language_function *p;
6997 p = ((struct c_language_function *)
6998 xmalloc (sizeof (struct c_language_function)));
6999 f->language = (struct language_function *) p;
7001 p->base.x_stmt_tree = c_stmt_tree;
7002 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7003 p->named_labels = named_labels;
7004 p->shadowed_labels = shadowed_labels;
7005 p->returns_value = current_function_returns_value;
7006 p->returns_null = current_function_returns_null;
7007 p->returns_abnormally = current_function_returns_abnormally;
7008 p->warn_about_return_type = warn_about_return_type;
7009 p->extern_inline = current_extern_inline;
7010 p->binding_level = current_binding_level;
7013 /* Restore the variables used during compilation of a C function. */
7016 c_pop_function_context (f)
7019 struct c_language_function *p
7020 = (struct c_language_function *) f->language;
7023 /* Bring back all the labels that were shadowed. */
7024 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7025 if (DECL_NAME (TREE_VALUE (link)) != 0)
7026 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7027 = TREE_VALUE (link);
7029 if (DECL_SAVED_INSNS (current_function_decl) == 0
7030 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7032 /* Stop pointing to the local nodes about to be freed. */
7033 /* But DECL_INITIAL must remain nonzero so we know this
7034 was an actual function definition. */
7035 DECL_INITIAL (current_function_decl) = error_mark_node;
7036 DECL_ARGUMENTS (current_function_decl) = 0;
7039 c_stmt_tree = p->base.x_stmt_tree;
7040 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7041 named_labels = p->named_labels;
7042 shadowed_labels = p->shadowed_labels;
7043 current_function_returns_value = p->returns_value;
7044 current_function_returns_null = p->returns_null;
7045 current_function_returns_abnormally = p->returns_abnormally;
7046 warn_about_return_type = p->warn_about_return_type;
7047 current_extern_inline = p->extern_inline;
7048 current_binding_level = p->binding_level;
7054 /* Mark the language specific parts of F for GC. */
7057 c_mark_function_context (f)
7060 struct c_language_function *p
7061 = (struct c_language_function *) f->language;
7066 mark_c_language_function (&p->base);
7067 ggc_mark_tree (p->shadowed_labels);
7068 ggc_mark_tree (p->named_labels);
7069 mark_binding_level (&p->binding_level);
7072 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7075 c_dup_lang_specific_decl (decl)
7078 struct lang_decl *ld;
7080 if (!DECL_LANG_SPECIFIC (decl))
7083 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7084 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7085 sizeof (struct lang_decl));
7086 DECL_LANG_SPECIFIC (decl) = ld;
7089 /* Mark the language specific bits in T for GC. */
7095 if (TREE_CODE (t) == IDENTIFIER_NODE)
7097 struct lang_identifier *i = (struct lang_identifier *) t;
7098 ggc_mark_tree (i->global_value);
7099 ggc_mark_tree (i->local_value);
7100 ggc_mark_tree (i->label_value);
7101 ggc_mark_tree (i->implicit_decl);
7102 ggc_mark_tree (i->error_locus);
7103 ggc_mark_tree (i->limbo_value);
7105 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7106 ggc_mark (TYPE_LANG_SPECIFIC (t));
7107 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7109 ggc_mark (DECL_LANG_SPECIFIC (t));
7110 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7111 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7115 /* The functions below are required for functionality of doing
7116 function at once processing in the C front end. Currently these
7117 functions are not called from anywhere in the C front end, but as
7118 these changes continue, that will change. */
7120 /* Returns non-zero if the current statement is a full expression,
7121 i.e. temporaries created during that statement should be destroyed
7122 at the end of the statement. */
7125 stmts_are_full_exprs_p ()
7130 /* Returns the stmt_tree (if any) to which statements are currently
7131 being added. If there is no active statement-tree, NULL is
7135 current_stmt_tree ()
7137 return &c_stmt_tree;
7140 /* Returns the stack of SCOPE_STMTs for the current function. */
7143 current_scope_stmt_stack ()
7145 return &c_scope_stmt_stack;
7148 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7152 anon_aggr_type_p (node)
7153 tree node ATTRIBUTE_UNUSED;
7158 /* Dummy function in place of callback used by C++. */
7161 extract_interface_info ()
7165 /* Return a new COMPOUND_STMT, after adding it to the current
7169 c_begin_compound_stmt ()
7173 /* Create the COMPOUND_STMT. */
7174 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7179 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7183 c_expand_decl_stmt (t)
7186 tree decl = DECL_STMT_DECL (t);
7188 /* Expand nested functions. */
7189 if (TREE_CODE (decl) == FUNCTION_DECL
7190 && DECL_CONTEXT (decl) == current_function_decl
7191 && DECL_SAVED_TREE (decl))
7192 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7195 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7196 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7199 identifier_global_value (t)
7202 return IDENTIFIER_GLOBAL_VALUE (t);
7205 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7206 otherwise the name is found in ridpointers from RID_INDEX. */
7209 record_builtin_type (rid_index, name, type)
7216 id = ridpointers[(int) rid_index];
7218 id = get_identifier (name);
7219 pushdecl (build_decl (TYPE_DECL, id, type));
7222 /* Build the void_list_node (void_type_node having been created). */
7224 build_void_list_node ()
7226 tree t = build_tree_list (NULL_TREE, void_type_node);