1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
33 #include "tree-inline.h"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file;
66 int pending_invalid_xref_line;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
74 static tree enum_next_value;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file;
102 static int current_function_prototype_line;
104 /* The current statement tree. */
106 static GTY(()) struct stmt_tree_s c_stmt_tree;
108 /* The current scope statement stack. */
110 static GTY(()) tree c_scope_stmt_stack;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static GTY(()) tree named_labels;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static GTY(()) tree shadowed_labels;
122 /* Nonzero when store_parm_decls is called indicates a varargs function.
123 Value not meaningful after store_parm_decls. */
125 static int c_function_varargs;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* For each binding contour we allocate a binding_level structure
152 * which records the names defined in that contour.
155 * 1) one for each function definition,
156 * where internal declarations of the parameters appear.
157 * 2) one for each compound statement,
158 * to record its declarations.
160 * The current meaning of a name can be found by searching the levels from
161 * the current one out to the global one.
164 /* Note that the information in the `names' component of the global contour
165 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
167 struct binding_level GTY(())
169 /* A chain of _DECL nodes for all variables, constants, functions,
170 and typedef types. These are in the reverse of the order supplied.
174 /* A list of structure, union and enum definitions,
175 * for looking up tag names.
176 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
177 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
178 * or ENUMERAL_TYPE node.
182 /* For each level, a list of shadowed outer-level local definitions
183 to be restored when this level is popped.
184 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
185 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
188 /* For each level (except not the global one),
189 a chain of BLOCK nodes for all the levels
190 that were entered and exited one level down. */
193 /* The BLOCK node for this level, if one has been preallocated.
194 If 0, the BLOCK is allocated (if needed) when the level is popped. */
197 /* The binding level which this one is contained in (inherits from). */
198 struct binding_level *level_chain;
200 /* Nonzero for the level that holds the parameters of a function. */
203 /* Nonzero if this level "doesn't exist" for tags. */
204 char tag_transparent;
206 /* Nonzero if sublevels of this level "don't exist" for tags.
207 This is set in the parm level of a function definition
208 while reading the function body, so that the outermost block
209 of the function body will be tag-transparent. */
210 char subblocks_tag_transparent;
212 /* Nonzero means make a BLOCK for this level regardless of all else. */
215 /* Nonzero means make a BLOCK if this level has any subblocks. */
216 char keep_if_subblocks;
218 /* List of decls in `names' that have incomplete structure or
220 tree incomplete_list;
222 /* A list of decls giving the (reversed) specified order of parms,
223 not including any forward-decls in the parmlist.
224 This is so we can put the parms in proper order for assign_parms. */
228 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
230 /* The binding level currently in effect. */
232 static GTY(()) struct binding_level *current_binding_level;
234 /* A chain of binding_level structures awaiting reuse. */
236 static GTY((deletable (""))) struct binding_level *free_binding_level;
238 /* The outermost binding level, for names of file scope.
239 This is created when the compiler is started and exists
240 through the entire run. */
242 static GTY(()) struct binding_level *global_binding_level;
244 /* Binding level structures are initialized by copying this one. */
246 static struct binding_level clear_binding_level
247 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, NULL,
250 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
252 static int keep_next_level_flag;
254 /* Nonzero means make a BLOCK for the next level pushed
255 if it has subblocks. */
257 static int keep_next_if_subblocks;
259 /* The chain of outer levels of label scopes.
260 This uses the same data structure used for binding levels,
261 but it works differently: each link in the chain records
262 saved values of named_labels and shadowed_labels for
263 a label binding level outside the current one. */
265 static GTY(()) struct binding_level *label_level_chain;
267 /* Functions called automatically at the beginning and end of execution. */
269 tree static_ctors, static_dtors;
271 /* Forward declarations. */
273 static struct binding_level * make_binding_level PARAMS ((void));
274 static void pop_binding_level PARAMS ((struct binding_level **));
275 static void clear_limbo_values PARAMS ((tree));
276 static int duplicate_decls PARAMS ((tree, tree, int));
277 static int redeclaration_error_message PARAMS ((tree, tree));
278 static void storedecls PARAMS ((tree));
279 static void storetags PARAMS ((tree));
280 static tree lookup_tag PARAMS ((enum tree_code, tree,
281 struct binding_level *, int));
282 static tree lookup_tag_reverse PARAMS ((tree));
283 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
285 static tree grokparms PARAMS ((tree, int));
286 static void layout_array_type PARAMS ((tree));
287 static tree c_make_fname_decl PARAMS ((tree, int));
288 static void c_expand_body PARAMS ((tree, int, int));
289 static void warn_if_shadowing PARAMS ((tree, tree));
291 /* C-specific option variables. */
293 /* Nonzero means allow type mismatches in conditional expressions;
294 just make their values `void'. */
296 int flag_cond_mismatch;
298 /* Nonzero means don't recognize the keyword `asm'. */
302 /* Nonzero means enable C89 Amendment 1 features. */
306 /* Nonzero means use the ISO C99 dialect of C. */
310 /* Nonzero means that we have builtin functions, and main is an int */
314 /* Nonzero means add default format_arg attributes for functions not
317 int flag_noniso_default_format_attributes = 1;
319 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
321 int flag_signed_bitfields = 1;
322 int explicit_flag_signed_bitfields = 0;
324 /* Nonzero means warn about use of implicit int. */
326 int warn_implicit_int;
328 /* Nonzero means warn about usage of long long when `-pedantic'. */
330 int warn_long_long = 1;
332 /* Nonzero means message about use of implicit function declarations;
333 1 means warning; 2 means error. */
335 int mesg_implicit_function_declaration = -1;
337 /* Nonzero means give string constants the type `const char *'
338 to get extra warnings from them. These warnings will be too numerous
339 to be useful, except in thoroughly ANSIfied programs. */
341 int flag_const_strings;
343 /* Nonzero means warn about pointer casts that can drop a type qualifier
344 from the pointer target type. */
348 /* Nonzero means warn when casting a function call to a type that does
349 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
350 when there is no previous declaration of sqrt or malloc. */
352 int warn_bad_function_cast;
354 /* Warn about functions which might be candidates for format attributes. */
356 int warn_missing_format_attribute;
358 /* Warn about traditional constructs whose meanings changed in ANSI C. */
360 int warn_traditional;
362 /* Nonzero means warn about sizeof(function) or addition/subtraction
363 of function pointers. */
365 int warn_pointer_arith;
367 /* Nonzero means warn for non-prototype function decls
368 or non-prototyped defs without previous prototype. */
370 int warn_strict_prototypes;
372 /* Nonzero means warn for any global function def
373 without separate previous prototype decl. */
375 int warn_missing_prototypes;
377 /* Nonzero means warn for any global function def
378 without separate previous decl. */
380 int warn_missing_declarations;
382 /* Nonzero means warn about multiple (redundant) decls for the same single
383 variable or function. */
385 int warn_redundant_decls = 0;
387 /* Nonzero means warn about extern declarations of objects not at
388 file-scope level and about *all* declarations of functions (whether
389 extern or static) not at file-scope level. Note that we exclude
390 implicit function declarations. To get warnings about those, use
393 int warn_nested_externs = 0;
395 /* Warn about a subscript that has type char. */
397 int warn_char_subscripts = 0;
399 /* Warn if a type conversion is done that might have confusing results. */
403 /* Warn if adding () is suggested. */
405 int warn_parentheses;
407 /* Warn if initializer is not completely bracketed. */
409 int warn_missing_braces;
411 /* Warn if main is suspicious. */
415 /* Warn about #pragma directives that are not recognised. */
417 int warn_unknown_pragmas = 0; /* Tri state variable. */
419 /* Warn about comparison of signed and unsigned values.
420 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
422 int warn_sign_compare = -1;
424 /* Warn about testing equality of floating point numbers. */
426 int warn_float_equal = 0;
428 /* Nonzero means `$' can be in an identifier. */
430 #ifndef DOLLARS_IN_IDENTIFIERS
431 #define DOLLARS_IN_IDENTIFIERS 1
433 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
435 /* States indicating how grokdeclarator() should handle declspecs marked
436 with __attribute__((deprecated)). An object declared as
437 __attribute__((deprecated)) suppresses warnings of uses of other
440 enum deprecated_states {
445 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
447 /* Decode the string P as a language-specific option for C.
448 Return the number of strings consumed. Should not complain
449 if it does not recognise the option. */
452 c_decode_option (argc, argv)
453 int argc ATTRIBUTE_UNUSED;
456 int strings_processed;
459 static const struct {
460 /* The name of the option. */
462 /* If non-NULL, a flag variable to set to 0 or 1. If NULL,
463 this means that cpp handles this option. */
466 /* This list is in alphabetical order. Keep it like that. */
467 { "bad-function-cast", &warn_bad_function_cast },
468 { "cast-qual", &warn_cast_qual },
469 { "char-subscripts", &warn_char_subscripts },
471 { "comments", NULL },
472 { "conversion", &warn_conversion },
473 { "div-by-zero", &warn_div_by_zero },
474 { "float-equal", &warn_float_equal },
475 { "format-extra-args", &warn_format_extra_args },
476 { "format-zero-length", &warn_format_zero_length },
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 { "nonnull", &warn_nonnull },
492 { "parentheses", &warn_parentheses },
493 { "pointer-arith", &warn_pointer_arith },
494 { "redundant-decls", &warn_redundant_decls },
495 { "return-type", &warn_return_type },
496 { "sequence-point", &warn_sequence_point },
497 { "sign-compare", &warn_sign_compare },
498 { "strict-prototypes", &warn_strict_prototypes },
499 { "traditional", &warn_traditional },
500 { "trigraphs", NULL },
502 { "write-strings", &flag_const_strings }
505 strings_processed = cpp_handle_option (parse_in, argc, argv);
507 if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
512 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
516 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
520 else if (!strncmp (p, "-std=", 5))
522 /* Select the appropriate language standard. We currently
524 -std=iso9899:1990 same as -ansi
525 -std=iso9899:199409 ISO C as modified in amend. 1
526 -std=iso9899:1999 ISO C 99
527 -std=c89 same as -std=iso9899:1990
528 -std=c99 same as -std=iso9899:1999
529 -std=gnu89 default, iso9899:1990 + gnu extensions
530 -std=gnu99 iso9899:1999 + gnu extensions
532 const char *const argstart = &p[5];
534 if (!strcmp (argstart, "iso9899:1990")
535 || !strcmp (argstart, "c89"))
540 flag_writable_strings = 0;
542 flag_no_nonansi_builtin = 1;
543 flag_noniso_default_format_attributes = 0;
547 else if (!strcmp (argstart, "iso9899:199409"))
552 else if (!strcmp (argstart, "iso9899:199x")
553 || !strcmp (argstart, "iso9899:1999")
554 || !strcmp (argstart, "c9x")
555 || !strcmp (argstart, "c99"))
557 flag_writable_strings = 0;
559 flag_no_nonansi_builtin = 1;
560 flag_noniso_default_format_attributes = 0;
565 else if (!strcmp (argstart, "gnu89"))
567 flag_writable_strings = 0;
569 flag_no_nonansi_builtin = 0;
570 flag_noniso_default_format_attributes = 1;
574 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
576 flag_writable_strings = 0;
578 flag_no_nonansi_builtin = 0;
579 flag_noniso_default_format_attributes = 1;
583 else if (!strcmp (argstart, "c++98"))
584 ; /* Handled by cpplib. */
586 error ("unknown C standard `%s'", argstart);
588 else if (!strcmp (p, "-fdollars-in-identifiers"))
589 dollars_in_ident = 1;
590 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
591 dollars_in_ident = 0;
592 else if (!strcmp (p, "-fsigned-char"))
593 flag_signed_char = 1;
594 else if (!strcmp (p, "-funsigned-char"))
595 flag_signed_char = 0;
596 else if (!strcmp (p, "-fno-signed-char"))
597 flag_signed_char = 0;
598 else if (!strcmp (p, "-fno-unsigned-char"))
599 flag_signed_char = 1;
600 else if (!strcmp (p, "-fsigned-bitfields")
601 || !strcmp (p, "-fno-unsigned-bitfields"))
603 flag_signed_bitfields = 1;
604 explicit_flag_signed_bitfields = 1;
606 else if (!strcmp (p, "-funsigned-bitfields")
607 || !strcmp (p, "-fno-signed-bitfields"))
609 flag_signed_bitfields = 0;
610 explicit_flag_signed_bitfields = 1;
612 else if (!strcmp (p, "-fshort-enums"))
613 flag_short_enums = 1;
614 else if (!strcmp (p, "-fno-short-enums"))
615 flag_short_enums = 0;
616 else if (!strcmp (p, "-fshort-wchar"))
617 flag_short_wchar = 1;
618 else if (!strcmp (p, "-fno-short-wchar"))
619 flag_short_wchar = 0;
620 else if (!strcmp (p, "-fcond-mismatch"))
621 flag_cond_mismatch = 1;
622 else if (!strcmp (p, "-fno-cond-mismatch"))
623 flag_cond_mismatch = 0;
624 else if (!strcmp (p, "-fshort-double"))
625 flag_short_double = 1;
626 else if (!strcmp (p, "-fno-short-double"))
627 flag_short_double = 0;
628 else if (!strcmp (p, "-fasm"))
630 else if (!strcmp (p, "-fno-asm"))
632 else if (!strcmp (p, "-fms-extensions"))
633 flag_ms_extensions = 1;
634 else if (!strcmp (p, "-fno-ms-extensions"))
635 flag_ms_extensions = 0;
636 else if (!strcmp (p, "-fbuiltin"))
638 else if (!strcmp (p, "-fno-builtin"))
640 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
641 disable_builtin_function (p + strlen ("-fno-builtin-"));
642 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
644 else if (!strcmp (p, "-ansi"))
646 else if (!strcmp (p, "-undef"))
648 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
649 mesg_implicit_function_declaration = 2;
650 else if (!strncmp (p, "-Wformat=", 9))
651 set_Wformat (atoi (p + 9));
652 else if (!strcmp (p, "-Wformat"))
654 else if (!strcmp (p, "-Wno-format"))
656 else if (!strcmp (p, "-Wimplicit"))
658 warn_implicit_int = 1;
659 if (mesg_implicit_function_declaration != 2)
660 mesg_implicit_function_declaration = 1;
662 else if (!strcmp (p, "-Wno-implicit"))
663 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
664 else if (!strcmp (p, "-Wno-main"))
666 else if (!strcmp (p, "-Wunknown-pragmas"))
667 /* Set to greater than 1, so that even unknown pragmas in system
668 headers will be warned about. */
669 warn_unknown_pragmas = 2;
670 else if (!strcmp (p, "-Wno-unknown-pragmas"))
671 warn_unknown_pragmas = 0;
672 else if (!strcmp (p, "-Wall"))
674 /* We save the value of warn_uninitialized, since if they put
675 -Wuninitialized on the command line, we need to generate a
676 warning about not using it without also specifying -O. */
677 if (warn_uninitialized != 1)
678 warn_uninitialized = 2;
679 warn_implicit_int = 1;
680 mesg_implicit_function_declaration = 1;
681 warn_return_type = 1;
685 warn_char_subscripts = 1;
686 warn_parentheses = 1;
687 warn_sequence_point = 1;
688 warn_missing_braces = 1;
689 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
690 it off only if it's not explicit. */
692 /* Only warn about unknown pragmas that are not in system headers. */
693 warn_unknown_pragmas = 1;
695 else if (!strcmp (p, "-E"))
696 flag_preprocess_only = 1;
700 for (i = 0; i < ARRAY_SIZE (warn_options); i++)
701 if (strncmp (p, "-W", 2) == 0
702 && warn_options[i].flag
703 && (strcmp (p+2, warn_options[i].option) == 0
704 || (strncmp (p+2, "no-", 3) == 0
705 && strcmp (p+5, warn_options[i].option) == 0)))
707 *(warn_options[i].flag) = strncmp (p+2, "no-", 3) != 0;
710 return strings_processed;
717 c_print_identifier (file, node, indent)
722 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
723 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
724 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
725 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
726 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
727 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
728 if (C_IS_RESERVED_WORD (node))
730 tree rid = ridpointers[C_RID_CODE (node)];
731 indent_to (file, indent + 4);
732 fprintf (file, "rid ");
733 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
734 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
738 /* Hook called at end of compilation to assume 1 elt
739 for a top-level tentative array defn that wasn't complete before. */
742 c_finish_incomplete_decl (decl)
745 if (TREE_CODE (decl) == VAR_DECL)
747 tree type = TREE_TYPE (decl);
748 if (type != error_mark_node
749 && TREE_CODE (type) == ARRAY_TYPE
750 && ! DECL_EXTERNAL (decl)
751 && TYPE_DOMAIN (type) == 0)
753 warning_with_decl (decl, "array `%s' assumed to have one element");
755 complete_array_type (type, NULL_TREE, 1);
757 layout_decl (decl, 0);
762 /* Reuse or create a struct for this binding level. */
764 static struct binding_level *
765 make_binding_level ()
767 if (free_binding_level)
769 struct binding_level *result = free_binding_level;
770 free_binding_level = result->level_chain;
774 return (struct binding_level *) ggc_alloc (sizeof (struct binding_level));
777 /* Remove a binding level from a list and add it to the level chain. */
780 pop_binding_level (lp)
781 struct binding_level **lp;
783 struct binding_level *l = *lp;
784 *lp = l->level_chain;
786 memset (l, 0, sizeof (struct binding_level));
787 l->level_chain = free_binding_level;
788 free_binding_level = l;
791 /* Nonzero if we are currently in the global binding level. */
796 return current_binding_level == global_binding_level;
802 keep_next_level_flag = 1;
805 /* Nonzero if the current level needs to have a BLOCK made. */
810 return ((current_binding_level->keep_if_subblocks
811 && current_binding_level->blocks != 0)
812 || current_binding_level->keep
813 || current_binding_level->names != 0
814 || (current_binding_level->tags != 0
815 && !current_binding_level->tag_transparent));
818 /* Identify this binding level as a level of parameters.
819 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
820 But it turns out there is no way to pass the right value for
821 DEFINITION_FLAG, so we ignore it. */
824 declare_parm_level (definition_flag)
825 int definition_flag ATTRIBUTE_UNUSED;
827 current_binding_level->parm_flag = 1;
830 /* Nonzero if currently making parm declarations. */
835 return current_binding_level->parm_flag;
838 /* Enter a new binding level.
839 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
840 not for that of tags. */
843 pushlevel (tag_transparent)
846 struct binding_level *newlevel = NULL_BINDING_LEVEL;
848 /* If this is the top level of a function,
849 just make sure that NAMED_LABELS is 0. */
851 if (current_binding_level == global_binding_level)
856 newlevel = make_binding_level ();
858 /* Add this level to the front of the chain (stack) of levels that
861 *newlevel = clear_binding_level;
862 newlevel->tag_transparent
864 || (current_binding_level
865 ? current_binding_level->subblocks_tag_transparent
867 newlevel->level_chain = current_binding_level;
868 current_binding_level = newlevel;
869 newlevel->keep = keep_next_level_flag;
870 keep_next_level_flag = 0;
871 newlevel->keep_if_subblocks = keep_next_if_subblocks;
872 keep_next_if_subblocks = 0;
875 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
878 clear_limbo_values (block)
883 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
884 if (DECL_NAME (tem) != 0)
885 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
887 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
888 clear_limbo_values (tem);
891 /* Exit a binding level.
892 Pop the level off, and restore the state of the identifier-decl mappings
893 that were in effect when this level was entered.
895 If KEEP is nonzero, this level had explicit declarations, so
896 and create a "block" (a BLOCK node) for the level
897 to record its declarations and subblocks for symbol table output.
899 If FUNCTIONBODY is nonzero, this level is the body of a function,
900 so create a block as if KEEP were set and also clear out all
903 If REVERSE is nonzero, reverse the order of decls before putting
904 them into the BLOCK. */
907 poplevel (keep, reverse, functionbody)
913 /* The chain of decls was accumulated in reverse order.
914 Put it into forward order, just for cleanliness. */
916 tree tags = current_binding_level->tags;
917 tree subblocks = current_binding_level->blocks;
920 int block_previously_created;
922 keep |= current_binding_level->keep;
924 /* This warning is turned off because it causes warnings for
925 declarations like `extern struct foo *x'. */
927 /* Warn about incomplete structure types in this level. */
928 for (link = tags; link; link = TREE_CHAIN (link))
929 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
931 tree type = TREE_VALUE (link);
932 tree type_name = TYPE_NAME (type);
933 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
935 : DECL_NAME (type_name));
936 switch (TREE_CODE (type))
939 error ("`struct %s' incomplete in scope ending here", id);
942 error ("`union %s' incomplete in scope ending here", id);
945 error ("`enum %s' incomplete in scope ending here", id);
951 /* Get the decls in the order they were written.
952 Usually current_binding_level->names is in reverse order.
953 But parameter decls were previously put in forward order. */
956 current_binding_level->names
957 = decls = nreverse (current_binding_level->names);
959 decls = current_binding_level->names;
961 /* Output any nested inline functions within this block
962 if they weren't already output. */
964 for (decl = decls; decl; decl = TREE_CHAIN (decl))
965 if (TREE_CODE (decl) == FUNCTION_DECL
966 && ! TREE_ASM_WRITTEN (decl)
967 && DECL_INITIAL (decl) != 0
968 && TREE_ADDRESSABLE (decl))
970 /* If this decl was copied from a file-scope decl
971 on account of a block-scope extern decl,
972 propagate TREE_ADDRESSABLE to the file-scope decl.
974 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
975 true, since then the decl goes through save_for_inline_copying. */
976 if (DECL_ABSTRACT_ORIGIN (decl) != 0
977 && DECL_ABSTRACT_ORIGIN (decl) != decl)
978 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
981 /* We used to warn about unused variables in expand_end_bindings,
982 i.e. while generating RTL. But in function-at-a-time mode we may
983 choose to never expand a function at all (e.g. auto inlining), so
984 we do this explicitly now. */
985 warn_about_unused_variables (getdecls ());
987 /* If there were any declarations or structure tags in that level,
988 or if this level is a function body,
989 create a BLOCK to record them for the life of this function. */
992 block_previously_created = (current_binding_level->this_block != 0);
993 if (block_previously_created)
994 block = current_binding_level->this_block;
995 else if (keep || functionbody
996 || (current_binding_level->keep_if_subblocks && subblocks != 0))
997 block = make_node (BLOCK);
1000 BLOCK_VARS (block) = decls;
1001 BLOCK_SUBBLOCKS (block) = subblocks;
1004 /* In each subblock, record that this is its superior. */
1006 for (link = subblocks; link; link = TREE_CHAIN (link))
1007 BLOCK_SUPERCONTEXT (link) = block;
1009 /* Clear out the meanings of the local variables of this level. */
1011 for (link = decls; link; link = TREE_CHAIN (link))
1013 if (DECL_NAME (link) != 0)
1015 /* If the ident. was used or addressed via a local extern decl,
1016 don't forget that fact. */
1017 if (DECL_EXTERNAL (link))
1019 if (TREE_USED (link))
1020 TREE_USED (DECL_NAME (link)) = 1;
1021 if (TREE_ADDRESSABLE (link))
1022 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1024 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1028 /* Restore all name-meanings of the outer levels
1029 that were shadowed by this level. */
1031 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1032 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1034 /* If the level being exited is the top level of a function,
1035 check over all the labels, and clear out the current
1036 (function local) meanings of their names. */
1040 clear_limbo_values (block);
1042 /* If this is the top level block of a function,
1043 the vars are the function's parameters.
1044 Don't leave them in the BLOCK because they are
1045 found in the FUNCTION_DECL instead. */
1047 BLOCK_VARS (block) = 0;
1049 /* Clear out the definitions of all label names,
1050 since their scopes end here,
1051 and add them to BLOCK_VARS. */
1053 for (link = named_labels; link; link = TREE_CHAIN (link))
1055 tree label = TREE_VALUE (link);
1057 if (DECL_INITIAL (label) == 0)
1059 error_with_decl (label, "label `%s' used but not defined");
1060 /* Avoid crashing later. */
1061 define_label (input_filename, lineno,
1064 else if (warn_unused_label && !TREE_USED (label))
1065 warning_with_decl (label, "label `%s' defined but not used");
1066 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1068 /* Put the labels into the "variables" of the
1069 top-level block, so debugger can see them. */
1070 TREE_CHAIN (label) = BLOCK_VARS (block);
1071 BLOCK_VARS (block) = label;
1075 /* Pop the current level, and free the structure for reuse. */
1077 pop_binding_level (¤t_binding_level);
1079 /* Dispose of the block that we just made inside some higher level. */
1081 DECL_INITIAL (current_function_decl) = block;
1084 if (!block_previously_created)
1085 current_binding_level->blocks
1086 = chainon (current_binding_level->blocks, block);
1088 /* If we did not make a block for the level just exited,
1089 any blocks made for inner levels
1090 (since they cannot be recorded as subblocks in that level)
1091 must be carried forward so they will later become subblocks
1092 of something else. */
1094 current_binding_level->blocks
1095 = chainon (current_binding_level->blocks, subblocks);
1097 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1098 binding contour so that they point to the appropriate construct, i.e.
1099 either to the current FUNCTION_DECL node, or else to the BLOCK node
1100 we just constructed.
1102 Note that for tagged types whose scope is just the formal parameter
1103 list for some function type specification, we can't properly set
1104 their TYPE_CONTEXTs here, because we don't have a pointer to the
1105 appropriate FUNCTION_TYPE node readily available to us. For those
1106 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1107 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1108 node which will represent the "scope" for these "parameter list local"
1112 for (link = tags; link; link = TREE_CHAIN (link))
1113 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1115 for (link = tags; link; link = TREE_CHAIN (link))
1116 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1119 TREE_USED (block) = 1;
1124 /* Insert BLOCK at the end of the list of subblocks of the
1125 current binding level. This is used when a BIND_EXPR is expanded,
1126 to handle the BLOCK node inside the BIND_EXPR. */
1129 insert_block (block)
1132 TREE_USED (block) = 1;
1133 current_binding_level->blocks
1134 = chainon (current_binding_level->blocks, block);
1137 /* Set the BLOCK node for the innermost scope
1138 (the one we are currently in). */
1144 current_binding_level->this_block = block;
1145 current_binding_level->names = chainon (current_binding_level->names,
1146 BLOCK_VARS (block));
1147 current_binding_level->blocks = chainon (current_binding_level->blocks,
1148 BLOCK_SUBBLOCKS (block));
1154 struct binding_level *newlevel;
1156 newlevel = make_binding_level ();
1158 /* Add this level to the front of the chain (stack) of label levels. */
1160 newlevel->level_chain = label_level_chain;
1161 label_level_chain = newlevel;
1163 newlevel->names = named_labels;
1164 newlevel->shadowed = shadowed_labels;
1166 shadowed_labels = 0;
1172 struct binding_level *level = label_level_chain;
1175 /* Clear out the definitions of the declared labels in this level.
1176 Leave in the list any ordinary, non-declared labels. */
1177 for (link = named_labels, prev = 0; link;)
1179 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1181 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1183 error_with_decl (TREE_VALUE (link),
1184 "label `%s' used but not defined");
1185 /* Avoid crashing later. */
1186 define_label (input_filename, lineno,
1187 DECL_NAME (TREE_VALUE (link)));
1189 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1190 warning_with_decl (TREE_VALUE (link),
1191 "label `%s' defined but not used");
1192 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1194 /* Delete this element from the list. */
1195 link = TREE_CHAIN (link);
1197 TREE_CHAIN (prev) = link;
1199 named_labels = link;
1204 link = TREE_CHAIN (link);
1208 /* Bring back all the labels that were shadowed. */
1209 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1210 if (DECL_NAME (TREE_VALUE (link)) != 0)
1211 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1212 = TREE_VALUE (link);
1214 named_labels = chainon (named_labels, level->names);
1215 shadowed_labels = level->shadowed;
1217 /* Pop the current level, and free the structure for reuse. */
1218 pop_binding_level (&label_level_chain);
1221 /* Push a definition or a declaration of struct, union or enum tag "name".
1222 "type" should be the type node.
1223 We assume that the tag "name" is not already defined.
1225 Note that the definition may really be just a forward reference.
1226 In that case, the TYPE_SIZE will be zero. */
1229 pushtag (name, type)
1232 struct binding_level *b;
1234 /* Find the proper binding level for this type tag. */
1236 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1241 /* Record the identifier as the type's name if it has none. */
1243 if (TYPE_NAME (type) == 0)
1244 TYPE_NAME (type) = name;
1247 b->tags = tree_cons (name, type, b->tags);
1249 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1250 tagged type we just added to the current binding level. This fake
1251 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1252 to output a representation of a tagged type, and it also gives
1253 us a convenient place to record the "scope start" address for the
1256 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1258 /* An approximation for now, so we can tell this is a function-scope tag.
1259 This will be updated in poplevel. */
1260 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1263 /* Handle when a new declaration NEWDECL
1264 has the same name as an old one OLDDECL
1265 in the same binding contour.
1266 Prints an error message if appropriate.
1268 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1269 Otherwise, return 0.
1271 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1272 and OLDDECL is in an outer binding level and should thus not be changed. */
1275 duplicate_decls (newdecl, olddecl, different_binding_level)
1276 tree newdecl, olddecl;
1277 int different_binding_level;
1279 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1280 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1281 && DECL_INITIAL (newdecl) != 0);
1282 tree oldtype = TREE_TYPE (olddecl);
1283 tree newtype = TREE_TYPE (newdecl);
1286 if (DECL_P (olddecl))
1288 if (TREE_CODE (newdecl) == FUNCTION_DECL
1289 && TREE_CODE (olddecl) == FUNCTION_DECL
1290 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1292 if (DECL_DECLARED_INLINE_P (newdecl)
1293 && DECL_UNINLINABLE (newdecl)
1294 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1295 /* Already warned elsewhere. */;
1296 else if (DECL_DECLARED_INLINE_P (olddecl)
1297 && DECL_UNINLINABLE (olddecl)
1298 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1299 /* Already warned. */;
1300 else if (DECL_DECLARED_INLINE_P (newdecl)
1301 && ! DECL_DECLARED_INLINE_P (olddecl)
1302 && DECL_UNINLINABLE (olddecl)
1303 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1305 warning_with_decl (newdecl,
1306 "function `%s' redeclared as inline");
1307 warning_with_decl (olddecl,
1308 "previous declaration of function `%s' with attribute noinline");
1310 else if (DECL_DECLARED_INLINE_P (olddecl)
1311 && DECL_UNINLINABLE (newdecl)
1312 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1314 warning_with_decl (newdecl,
1315 "function `%s' redeclared with attribute noinline");
1316 warning_with_decl (olddecl,
1317 "previous declaration of function `%s' was inline");
1321 DECL_ATTRIBUTES (newdecl)
1322 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1325 if (TREE_CODE (newtype) == ERROR_MARK
1326 || TREE_CODE (oldtype) == ERROR_MARK)
1329 /* New decl is completely inconsistent with the old one =>
1330 tell caller to replace the old one.
1331 This is always an error except in the case of shadowing a builtin. */
1332 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1334 if (TREE_CODE (olddecl) == FUNCTION_DECL
1335 && (DECL_BUILT_IN (olddecl)
1336 || DECL_BUILT_IN_NONANSI (olddecl)))
1338 /* If you declare a built-in or predefined function name as static,
1339 the old definition is overridden,
1340 but optionally warn this was a bad choice of name. */
1341 if (!TREE_PUBLIC (newdecl))
1345 else if (DECL_BUILT_IN (olddecl))
1346 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1348 warning_with_decl (newdecl, "shadowing library function `%s'");
1350 /* Likewise, if the built-in is not ansi, then programs can
1351 override it even globally without an error. */
1352 else if (! DECL_BUILT_IN (olddecl))
1353 warning_with_decl (newdecl,
1354 "library function `%s' declared as non-function");
1356 else if (DECL_BUILT_IN_NONANSI (olddecl))
1357 warning_with_decl (newdecl,
1358 "built-in function `%s' declared as non-function");
1360 warning_with_decl (newdecl,
1361 "built-in function `%s' declared as non-function");
1365 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1366 error_with_decl (olddecl, "previous declaration of `%s'");
1372 /* For real parm decl following a forward decl,
1373 return 1 so old decl will be reused. */
1374 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1375 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1378 /* The new declaration is the same kind of object as the old one.
1379 The declarations may partially match. Print warnings if they don't
1380 match enough. Ultimately, copy most of the information from the new
1381 decl to the old one, and keep using the old one. */
1383 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
1385 /* A function declaration for a built-in function. */
1386 if (!TREE_PUBLIC (newdecl))
1388 /* If you declare a built-in function name as static, the
1389 built-in definition is overridden,
1390 but optionally warn this was a bad choice of name. */
1392 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1393 /* Discard the old built-in function. */
1396 else if (!types_match)
1398 /* Accept the return type of the new declaration if same modes. */
1399 tree oldreturntype = TREE_TYPE (oldtype);
1400 tree newreturntype = TREE_TYPE (newtype);
1402 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1404 /* Function types may be shared, so we can't just modify
1405 the return type of olddecl's function type. */
1407 = build_function_type (newreturntype,
1408 TYPE_ARG_TYPES (oldtype));
1409 trytype = build_type_attribute_variant (trytype,
1410 TYPE_ATTRIBUTES (oldtype));
1412 types_match = comptypes (newtype, trytype);
1416 /* Accept harmless mismatch in first argument type also.
1417 This is for the ffs and fprintf builtins. */
1418 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1419 && TYPE_ARG_TYPES (oldtype) != 0
1420 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1421 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1422 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1423 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1425 /* Function types may be shared, so we can't just modify
1426 the return type of olddecl's function type. */
1428 = build_function_type (TREE_TYPE (oldtype),
1429 tree_cons (NULL_TREE,
1430 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1431 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1432 trytype = build_type_attribute_variant (trytype,
1433 TYPE_ATTRIBUTES (oldtype));
1435 types_match = comptypes (newtype, trytype);
1439 if (! different_binding_level)
1440 TREE_TYPE (olddecl) = oldtype;
1442 else if (TYPE_ARG_TYPES (oldtype) == NULL
1443 && TYPE_ARG_TYPES (newtype) != NULL)
1445 /* For bcmp, bzero, fputs the builtin type has arguments not
1446 specified. Use the ones from the prototype so that type checking
1447 is done for them. */
1449 = build_function_type (TREE_TYPE (oldtype),
1450 TYPE_ARG_TYPES (newtype));
1451 trytype = build_type_attribute_variant (trytype,
1452 TYPE_ATTRIBUTES (oldtype));
1455 if (! different_binding_level)
1456 TREE_TYPE (olddecl) = oldtype;
1460 /* If types don't match for a built-in, throw away the built-in. */
1461 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1465 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1466 && DECL_SOURCE_LINE (olddecl) == 0)
1468 /* A function declaration for a predeclared function
1469 that isn't actually built in. */
1470 if (!TREE_PUBLIC (newdecl))
1472 /* If you declare it as static, the
1473 default definition is overridden. */
1476 else if (!types_match)
1478 /* If the types don't match, preserve volatility indication.
1479 Later on, we will discard everything else about the
1480 default declaration. */
1481 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1484 /* Permit char *foo () to match void *foo (...) if not pedantic,
1485 if one of them came from a system header file. */
1486 else if (!types_match
1487 && TREE_CODE (olddecl) == FUNCTION_DECL
1488 && TREE_CODE (newdecl) == FUNCTION_DECL
1489 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1490 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1491 && (DECL_IN_SYSTEM_HEADER (olddecl)
1492 || DECL_IN_SYSTEM_HEADER (newdecl))
1493 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1494 && TYPE_ARG_TYPES (oldtype) == 0
1495 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1496 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1498 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1499 && TYPE_ARG_TYPES (newtype) == 0
1500 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1501 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1504 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1505 /* Make sure we keep void * as ret type, not char *. */
1506 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1507 TREE_TYPE (newdecl) = newtype = oldtype;
1509 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1510 we will come back here again. */
1511 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1513 else if (!types_match
1514 /* Permit char *foo (int, ...); followed by char *foo ();
1516 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1518 /* Return types must still match. */
1519 && comptypes (TREE_TYPE (oldtype),
1520 TREE_TYPE (newtype))
1521 && TYPE_ARG_TYPES (newtype) == 0))
1523 error_with_decl (newdecl, "conflicting types for `%s'");
1524 /* Check for function type mismatch
1525 involving an empty arglist vs a nonempty one. */
1526 if (TREE_CODE (olddecl) == FUNCTION_DECL
1527 && comptypes (TREE_TYPE (oldtype),
1528 TREE_TYPE (newtype))
1529 && ((TYPE_ARG_TYPES (oldtype) == 0
1530 && DECL_INITIAL (olddecl) == 0)
1532 (TYPE_ARG_TYPES (newtype) == 0
1533 && DECL_INITIAL (newdecl) == 0)))
1535 /* Classify the problem further. */
1536 tree t = TYPE_ARG_TYPES (oldtype);
1538 t = TYPE_ARG_TYPES (newtype);
1539 for (; t; t = TREE_CHAIN (t))
1541 tree type = TREE_VALUE (t);
1543 if (TREE_CHAIN (t) == 0
1544 && TYPE_MAIN_VARIANT (type) != void_type_node)
1546 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1550 if (c_type_promotes_to (type) != type)
1552 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1557 error_with_decl (olddecl, "previous declaration of `%s'");
1561 errmsg = redeclaration_error_message (newdecl, olddecl);
1567 error_with_decl (newdecl, "redefinition of `%s'");
1570 error_with_decl (newdecl, "redeclaration of `%s'");
1573 error_with_decl (newdecl, "conflicting declarations of `%s'");
1579 error_with_decl (olddecl,
1580 ((DECL_INITIAL (olddecl)
1581 && current_binding_level == global_binding_level)
1582 ? "`%s' previously defined here"
1583 : "`%s' previously declared here"));
1586 else if (TREE_CODE (newdecl) == TYPE_DECL
1587 && (DECL_IN_SYSTEM_HEADER (olddecl)
1588 || DECL_IN_SYSTEM_HEADER (newdecl)))
1590 warning_with_decl (newdecl, "redefinition of `%s'");
1593 ((DECL_INITIAL (olddecl)
1594 && current_binding_level == global_binding_level)
1595 ? "`%s' previously defined here"
1596 : "`%s' previously declared here"));
1598 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1599 && DECL_INITIAL (olddecl) != 0
1600 && TYPE_ARG_TYPES (oldtype) == 0
1601 && TYPE_ARG_TYPES (newtype) != 0
1602 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1606 /* Prototype decl follows defn w/o prototype. */
1608 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1609 type = TYPE_ARG_TYPES (newtype),
1612 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1614 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1615 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1617 warning_with_decl (newdecl, "prototype for `%s' follows");
1618 warning_with_decl (olddecl, "non-prototype definition here");
1621 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1622 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1624 error_with_decl (newdecl,
1625 "prototype for `%s' follows and number of arguments doesn't match");
1626 error_with_decl (olddecl, "non-prototype definition here");
1630 /* Type for passing arg must be consistent
1631 with that declared for the arg. */
1632 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1634 error_with_decl (newdecl,
1635 "prototype for `%s' follows and argument %d doesn't match",
1637 error_with_decl (olddecl, "non-prototype definition here");
1643 /* Warn about mismatches in various flags. */
1646 /* Warn if function is now inline
1647 but was previously declared not inline and has been called. */
1648 if (TREE_CODE (olddecl) == FUNCTION_DECL
1649 && ! DECL_DECLARED_INLINE_P (olddecl)
1650 && DECL_DECLARED_INLINE_P (newdecl)
1651 && TREE_USED (olddecl))
1652 warning_with_decl (newdecl,
1653 "`%s' declared inline after being called");
1654 if (TREE_CODE (olddecl) == FUNCTION_DECL
1655 && ! DECL_DECLARED_INLINE_P (olddecl)
1656 && DECL_DECLARED_INLINE_P (newdecl)
1657 && DECL_INITIAL (olddecl) != 0)
1658 warning_with_decl (newdecl,
1659 "`%s' declared inline after its definition");
1661 /* If pedantic, warn when static declaration follows a non-static
1662 declaration. Otherwise, do so only for functions. */
1663 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1664 && TREE_PUBLIC (olddecl)
1665 && !TREE_PUBLIC (newdecl))
1666 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1668 /* If warn_traditional, warn when a non-static function
1669 declaration follows a static one. */
1670 if (warn_traditional && !in_system_header
1671 && TREE_CODE (olddecl) == FUNCTION_DECL
1672 && !TREE_PUBLIC (olddecl)
1673 && TREE_PUBLIC (newdecl))
1674 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1676 /* Warn when const declaration follows a non-const
1677 declaration, but not for functions. */
1678 if (TREE_CODE (olddecl) != FUNCTION_DECL
1679 && !TREE_READONLY (olddecl)
1680 && TREE_READONLY (newdecl))
1681 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1682 /* These bits are logically part of the type, for variables.
1683 But not for functions
1684 (where qualifiers are not valid ANSI anyway). */
1685 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1686 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1687 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1688 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1692 /* Optionally warn about more than one declaration for the same name. */
1693 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1694 /* Don't warn about a function declaration
1695 followed by a definition. */
1696 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1697 && DECL_INITIAL (olddecl) == 0)
1698 /* Don't warn about extern decl followed by (tentative) definition. */
1699 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1701 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1702 warning_with_decl (olddecl, "previous declaration of `%s'");
1705 /* Copy all the DECL_... slots specified in the new decl
1706 except for any that we copy here from the old type.
1708 Past this point, we don't change OLDTYPE and NEWTYPE
1709 even if we change the types of NEWDECL and OLDDECL. */
1713 /* When copying info to olddecl, we store into write_olddecl
1714 instead. This allows us to avoid modifying olddecl when
1715 different_binding_level is true. */
1716 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1718 /* Merge the data types specified in the two decls. */
1719 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1721 if (different_binding_level)
1723 if (TYPE_ARG_TYPES (oldtype) != 0
1724 && TYPE_ARG_TYPES (newtype) == 0)
1725 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1728 = build_type_attribute_variant
1730 merge_attributes (TYPE_ATTRIBUTES (newtype),
1731 TYPE_ATTRIBUTES (oldtype)));
1735 = TREE_TYPE (olddecl)
1736 = common_type (newtype, oldtype);
1739 /* Lay the type out, unless already done. */
1740 if (oldtype != TREE_TYPE (newdecl))
1742 if (TREE_TYPE (newdecl) != error_mark_node)
1743 layout_type (TREE_TYPE (newdecl));
1744 if (TREE_CODE (newdecl) != FUNCTION_DECL
1745 && TREE_CODE (newdecl) != TYPE_DECL
1746 && TREE_CODE (newdecl) != CONST_DECL)
1747 layout_decl (newdecl, 0);
1751 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1752 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1753 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1754 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1755 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1756 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1758 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1759 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1763 /* Keep the old rtl since we can safely use it. */
1764 COPY_DECL_RTL (olddecl, newdecl);
1766 /* Merge the type qualifiers. */
1767 if (TREE_CODE (olddecl) == FUNCTION_DECL
1768 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1769 && ! TREE_THIS_VOLATILE (newdecl))
1770 TREE_THIS_VOLATILE (write_olddecl) = 0;
1772 if (TREE_READONLY (newdecl))
1773 TREE_READONLY (write_olddecl) = 1;
1775 if (TREE_THIS_VOLATILE (newdecl))
1777 TREE_THIS_VOLATILE (write_olddecl) = 1;
1778 if (TREE_CODE (newdecl) == VAR_DECL
1779 /* If an automatic variable is re-declared in the same
1780 function scope, but the old declaration was not
1781 volatile, make_var_volatile() would crash because the
1782 variable would have been assigned to a pseudo, not a
1783 MEM. Since this duplicate declaration is invalid
1784 anyway, we just skip the call. */
1786 make_var_volatile (newdecl);
1789 /* Keep source location of definition rather than declaration. */
1790 /* When called with different_binding_level set, keep the old
1791 information so that meaningful diagnostics can be given. */
1792 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1793 && ! different_binding_level)
1795 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1796 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1799 /* Merge the unused-warning information. */
1800 if (DECL_IN_SYSTEM_HEADER (olddecl))
1801 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1802 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1803 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1805 /* Merge the initialization information. */
1806 /* When called with different_binding_level set, don't copy over
1807 DECL_INITIAL, so that we don't accidentally change function
1808 declarations into function definitions. */
1809 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1810 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1812 /* Merge the section attribute.
1813 We want to issue an error if the sections conflict but that must be
1814 done later in decl_attributes since we are called before attributes
1816 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1817 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1819 /* Copy the assembler name.
1820 Currently, it can only be defined in the prototype. */
1821 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1823 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1825 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1826 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1827 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1828 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1829 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1832 /* If cannot merge, then use the new type and qualifiers,
1833 and don't preserve the old rtl. */
1834 else if (! different_binding_level)
1836 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1837 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1838 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1839 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1842 /* Merge the storage class information. */
1843 merge_weak (newdecl, olddecl);
1845 /* For functions, static overrides non-static. */
1846 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1848 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1849 /* This is since we don't automatically
1850 copy the attributes of NEWDECL into OLDDECL. */
1851 /* No need to worry about different_binding_level here because
1852 then TREE_PUBLIC (newdecl) was true. */
1853 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1854 /* If this clears `static', clear it in the identifier too. */
1855 if (! TREE_PUBLIC (olddecl))
1856 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1858 if (DECL_EXTERNAL (newdecl))
1860 if (! different_binding_level)
1862 /* Don't mess with these flags on local externs; they remain
1863 external even if there's a declaration at file scope which
1865 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1866 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1868 /* An extern decl does not override previous storage class. */
1869 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1870 if (! DECL_EXTERNAL (newdecl))
1871 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1875 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1876 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1879 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1881 /* If we're redefining a function previously defined as extern
1882 inline, make sure we emit debug info for the inline before we
1883 throw it away, in case it was inlined into a function that hasn't
1884 been written out yet. */
1885 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1887 (*debug_hooks->outlining_inline_function) (olddecl);
1889 /* The new defn must not be inline. */
1890 DECL_INLINE (newdecl) = 0;
1891 DECL_UNINLINABLE (newdecl) = 1;
1895 /* If either decl says `inline', this fn is inline,
1896 unless its definition was passed already. */
1897 if (DECL_DECLARED_INLINE_P (newdecl)
1898 || DECL_DECLARED_INLINE_P (olddecl))
1899 DECL_DECLARED_INLINE_P (newdecl) = 1;
1901 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1902 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1905 if (DECL_BUILT_IN (olddecl))
1907 /* Get rid of any built-in function if new arg types don't match it
1908 or if we have a function definition. */
1909 if (! types_match || new_is_definition)
1911 if (! different_binding_level)
1913 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1914 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1919 /* If redeclaring a builtin function, and not a definition,
1920 it stays built in. */
1921 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1922 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1926 /* Also preserve various other info from the definition. */
1927 if (! new_is_definition)
1929 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1930 /* When called with different_binding_level set, don't copy over
1931 DECL_INITIAL, so that we don't accidentally change function
1932 declarations into function definitions. */
1933 if (! different_binding_level)
1934 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1935 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1936 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1937 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1938 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1940 /* Set DECL_INLINE on the declaration if we've got a body
1941 from which to instantiate. */
1942 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1944 DECL_INLINE (newdecl) = 1;
1945 DECL_ABSTRACT_ORIGIN (newdecl)
1946 = (different_binding_level
1947 ? DECL_ORIGIN (olddecl)
1948 : DECL_ABSTRACT_ORIGIN (olddecl));
1953 /* If a previous declaration said inline, mark the
1954 definition as inlinable. */
1955 if (DECL_DECLARED_INLINE_P (newdecl)
1956 && ! DECL_UNINLINABLE (newdecl))
1957 DECL_INLINE (newdecl) = 1;
1960 if (different_binding_level)
1963 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1964 But preserve OLDDECL's DECL_UID. */
1966 unsigned olddecl_uid = DECL_UID (olddecl);
1968 memcpy ((char *) olddecl + sizeof (struct tree_common),
1969 (char *) newdecl + sizeof (struct tree_common),
1970 sizeof (struct tree_decl) - sizeof (struct tree_common));
1971 DECL_UID (olddecl) = olddecl_uid;
1974 /* NEWDECL contains the merged attribute lists.
1975 Update OLDDECL to be the same. */
1976 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1981 /* Check whether decl-node X shadows an existing declaration.
1982 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1983 which might be a NULL_TREE. */
1985 warn_if_shadowing (x, oldlocal)
1990 if (DECL_EXTERNAL (x))
1993 name = DECL_NAME (x);
1995 /* Warn if shadowing an argument at the top level of the body. */
1997 /* This warning doesn't apply to the parms of a nested fcn. */
1998 && ! current_binding_level->parm_flag
1999 /* Check that this is one level down from the parms. */
2000 && current_binding_level->level_chain->parm_flag
2001 /* Check that the decl being shadowed
2002 comes from the parm level, one level up. */
2003 && chain_member (oldlocal, current_binding_level->level_chain->names))
2005 if (TREE_CODE (oldlocal) == PARM_DECL)
2006 pedwarn ("declaration of `%s' shadows a parameter",
2007 IDENTIFIER_POINTER (name));
2009 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2010 IDENTIFIER_POINTER (name));
2012 /* Maybe warn if shadowing something else. */
2013 else if (warn_shadow
2014 /* No shadow warnings for internally generated vars. */
2015 && DECL_SOURCE_LINE (x) != 0
2016 /* No shadow warnings for vars made for inlining. */
2017 && ! DECL_FROM_INLINE (x))
2019 if (TREE_CODE (x) == PARM_DECL
2020 && current_binding_level->level_chain->parm_flag)
2021 /* Don't warn about the parm names in function declarator
2022 within a function declarator.
2023 It would be nice to avoid warning in any function
2024 declarator in a declaration, as opposed to a definition,
2025 but there is no way to tell it's not a definition. */
2029 if (TREE_CODE (oldlocal) == PARM_DECL)
2030 shadow_warning ("a parameter", name, oldlocal);
2032 shadow_warning ("a previous local", name, oldlocal);
2034 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2035 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2036 shadow_warning ("a global declaration", name,
2037 IDENTIFIER_GLOBAL_VALUE (name));
2041 /* Record a decl-node X as belonging to the current lexical scope.
2042 Check for errors (such as an incompatible declaration for the same
2043 name already seen in the same scope).
2045 Returns either X or an old decl for the same name.
2046 If an old decl is returned, it may have been smashed
2047 to agree with what X says. */
2054 tree name = DECL_NAME (x);
2055 struct binding_level *b = current_binding_level;
2057 /* Functions need the lang_decl data. */
2058 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2059 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2060 ggc_alloc_cleared (sizeof (struct lang_decl));
2062 DECL_CONTEXT (x) = current_function_decl;
2063 /* A local extern declaration for a function doesn't constitute nesting.
2064 A local auto declaration does, since it's a forward decl
2065 for a nested function coming later. */
2066 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2067 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2068 DECL_CONTEXT (x) = 0;
2072 int different_binding_level = 0;
2074 if (warn_nested_externs
2075 && DECL_EXTERNAL (x)
2076 && b != global_binding_level
2077 && x != IDENTIFIER_IMPLICIT_DECL (name)
2078 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2079 && !DECL_IN_SYSTEM_HEADER (x))
2080 warning ("nested extern declaration of `%s'",
2081 IDENTIFIER_POINTER (name));
2083 t = lookup_name_current_level (name);
2084 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2086 t = IDENTIFIER_GLOBAL_VALUE (name);
2087 /* Type decls at global scope don't conflict with externs declared
2088 inside lexical blocks. */
2089 if (! t || TREE_CODE (t) == TYPE_DECL)
2090 /* If there's no visible global declaration, try for an
2092 t = IDENTIFIER_LIMBO_VALUE (name);
2093 different_binding_level = 1;
2095 if (t != 0 && t == error_mark_node)
2096 /* error_mark_node is 0 for a while during initialization! */
2099 error_with_decl (x, "`%s' used prior to declaration");
2102 /* If this decl is `static' and an implicit decl was seen previously,
2104 if (TREE_PUBLIC (name)
2105 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2106 sets this for all functions. */
2107 && ! TREE_PUBLIC (x)
2108 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2109 /* We used to warn also for explicit extern followed by static,
2110 but sometimes you need to do it that way. */
2111 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2113 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2114 IDENTIFIER_POINTER (name));
2115 pedwarn_with_file_and_line
2116 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2117 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2118 "previous declaration of `%s'",
2119 IDENTIFIER_POINTER (name));
2120 TREE_THIS_VOLATILE (name) = 1;
2123 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2125 if (TREE_CODE (t) == PARM_DECL)
2127 /* Don't allow more than one "real" duplicate
2128 of a forward parm decl. */
2129 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2135 /* If we are processing a typedef statement, generate a whole new
2136 ..._TYPE node (which will be just an variant of the existing
2137 ..._TYPE node with identical properties) and then install the
2138 TYPE_DECL node generated to represent the typedef name as the
2139 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2141 The whole point here is to end up with a situation where each
2142 and every ..._TYPE node the compiler creates will be uniquely
2143 associated with AT MOST one node representing a typedef name.
2144 This way, even though the compiler substitutes corresponding
2145 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2146 early on, later parts of the compiler can always do the reverse
2147 translation and get back the corresponding typedef name. For
2150 typedef struct S MY_TYPE;
2153 Later parts of the compiler might only know that `object' was of
2154 type `struct S' if it were not for code just below. With this
2155 code however, later parts of the compiler see something like:
2157 struct S' == struct S
2158 typedef struct S' MY_TYPE;
2161 And they can then deduce (from the node for type struct S') that
2162 the original object declaration was:
2166 Being able to do this is important for proper support of protoize,
2167 and also for generating precise symbolic debugging information
2168 which takes full account of the programmer's (typedef) vocabulary.
2170 Obviously, we don't want to generate a duplicate ..._TYPE node if
2171 the TYPE_DECL node that we are now processing really represents a
2172 standard built-in type.
2174 Since all standard types are effectively declared at line zero
2175 in the source file, we can easily check to see if we are working
2176 on a standard type by checking the current value of lineno. */
2178 if (TREE_CODE (x) == TYPE_DECL)
2180 if (DECL_SOURCE_LINE (x) == 0)
2182 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2183 TYPE_NAME (TREE_TYPE (x)) = x;
2185 else if (TREE_TYPE (x) != error_mark_node
2186 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2188 tree tt = TREE_TYPE (x);
2189 DECL_ORIGINAL_TYPE (x) = tt;
2190 tt = build_type_copy (tt);
2192 TREE_USED (tt) = TREE_USED (x);
2197 /* Multiple external decls of the same identifier ought to match.
2198 We get warnings about inline functions where they are defined.
2199 Avoid duplicate warnings where they are used. */
2201 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2205 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2206 /* Decls in limbo are always extern, so no need to check that. */
2207 decl = IDENTIFIER_LIMBO_VALUE (name);
2211 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2212 /* If old decl is built-in, we already warned if we should. */
2213 && !DECL_BUILT_IN (decl))
2215 pedwarn_with_decl (x,
2216 "type mismatch with previous external decl");
2217 pedwarn_with_decl (decl, "previous external decl of `%s'");
2221 /* If a function has had an implicit declaration, and then is defined,
2222 make sure they are compatible. */
2224 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2225 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2226 && TREE_CODE (x) == FUNCTION_DECL
2227 && ! comptypes (TREE_TYPE (x),
2228 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2230 warning_with_decl (x, "type mismatch with previous implicit declaration");
2231 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2232 "previous implicit declaration of `%s'");
2235 /* This name is new in its binding level.
2236 Install the new declaration and return it. */
2237 if (b == global_binding_level)
2239 /* Install a global value. */
2241 /* If the first global decl has external linkage,
2242 warn if we later see static one. */
2243 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2244 TREE_PUBLIC (name) = 1;
2246 IDENTIFIER_GLOBAL_VALUE (name) = x;
2248 /* We no longer care about any previous block level declarations. */
2249 IDENTIFIER_LIMBO_VALUE (name) = 0;
2251 /* Don't forget if the function was used via an implicit decl. */
2252 if (IDENTIFIER_IMPLICIT_DECL (name)
2253 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2254 TREE_USED (x) = 1, TREE_USED (name) = 1;
2256 /* Don't forget if its address was taken in that way. */
2257 if (IDENTIFIER_IMPLICIT_DECL (name)
2258 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2259 TREE_ADDRESSABLE (x) = 1;
2261 /* Warn about mismatches against previous implicit decl. */
2262 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2263 /* If this real decl matches the implicit, don't complain. */
2264 && ! (TREE_CODE (x) == FUNCTION_DECL
2265 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2266 == integer_type_node)))
2267 pedwarn ("`%s' was previously implicitly declared to return `int'",
2268 IDENTIFIER_POINTER (name));
2270 /* If this decl is `static' and an `extern' was seen previously,
2271 that is erroneous. */
2272 if (TREE_PUBLIC (name)
2273 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2275 /* Okay to redeclare an ANSI built-in as static. */
2276 if (t != 0 && DECL_BUILT_IN (t))
2278 /* Okay to declare a non-ANSI built-in as anything. */
2279 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2281 /* Okay to have global type decl after an earlier extern
2282 declaration inside a lexical block. */
2283 else if (TREE_CODE (x) == TYPE_DECL)
2285 else if (IDENTIFIER_IMPLICIT_DECL (name))
2287 if (! TREE_THIS_VOLATILE (name))
2288 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2289 IDENTIFIER_POINTER (name));
2292 pedwarn ("`%s' was declared `extern' and later `static'",
2293 IDENTIFIER_POINTER (name));
2298 /* Here to install a non-global value. */
2299 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2300 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2302 IDENTIFIER_LOCAL_VALUE (name) = x;
2304 /* If this is an extern function declaration, see if we
2305 have a global definition or declaration for the function. */
2308 && TREE_CODE (x) == FUNCTION_DECL
2309 && TREE_CODE (oldglobal) == FUNCTION_DECL
2310 && DECL_EXTERNAL (x)
2311 && ! DECL_DECLARED_INLINE_P (x))
2313 /* We have one. Their types must agree. */
2314 if (! comptypes (TREE_TYPE (x),
2315 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2316 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2319 /* Inner extern decl is inline if global one is.
2320 Copy enough to really inline it. */
2321 if (DECL_DECLARED_INLINE_P (oldglobal))
2323 DECL_DECLARED_INLINE_P (x)
2324 = DECL_DECLARED_INLINE_P (oldglobal);
2325 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2326 DECL_INITIAL (x) = (current_function_decl == oldglobal
2327 ? 0 : DECL_INITIAL (oldglobal));
2328 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2329 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2330 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2331 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2332 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2333 DECL_ABSTRACT_ORIGIN (x)
2334 = DECL_ABSTRACT_ORIGIN (oldglobal);
2336 /* Inner extern decl is built-in if global one is. */
2337 if (DECL_BUILT_IN (oldglobal))
2339 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2340 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2342 /* Keep the arg types from a file-scope fcn defn. */
2343 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2344 && DECL_INITIAL (oldglobal)
2345 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2346 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2351 /* This case is probably sometimes the right thing to do. */
2352 /* If we have a local external declaration,
2353 then any file-scope declaration should not
2354 have been static. */
2355 if (oldlocal == 0 && oldglobal != 0
2356 && !TREE_PUBLIC (oldglobal)
2357 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2358 warning ("`%s' locally external but globally static",
2359 IDENTIFIER_POINTER (name));
2362 /* If we have a local external declaration,
2363 and no file-scope declaration has yet been seen,
2364 then if we later have a file-scope decl it must not be static. */
2366 && DECL_EXTERNAL (x)
2370 TREE_PUBLIC (name) = 1;
2372 /* Save this decl, so that we can do type checking against
2373 other decls after it falls out of scope.
2375 Only save it once. This prevents temporary decls created in
2376 expand_inline_function from being used here, since this
2377 will have been set when the inline function was parsed.
2378 It also helps give slightly better warnings. */
2379 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2380 IDENTIFIER_LIMBO_VALUE (name) = x;
2383 warn_if_shadowing (x, oldlocal);
2385 /* If storing a local value, there may already be one (inherited).
2386 If so, record it for restoration when this binding level ends. */
2388 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2391 /* Keep list of variables in this level with incomplete type.
2392 If the input is erroneous, we can have error_mark in the type
2393 slot (e.g. "f(void a, ...)") - that doesn't count as an
2395 if (TREE_TYPE (x) != error_mark_node
2396 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2398 tree element = TREE_TYPE (x);
2400 while (TREE_CODE (element) == ARRAY_TYPE)
2401 element = TREE_TYPE (element);
2402 if (TREE_CODE (element) == RECORD_TYPE
2403 || TREE_CODE (element) == UNION_TYPE)
2404 b->incomplete_list = tree_cons (NULL_TREE, x, b->incomplete_list);
2408 /* Put decls on list in reverse order.
2409 We will reverse them later if necessary. */
2410 TREE_CHAIN (x) = b->names;
2416 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2419 pushdecl_top_level (x)
2423 struct binding_level *b = current_binding_level;
2425 current_binding_level = global_binding_level;
2427 current_binding_level = b;
2431 /* Generate an implicit declaration for identifier FUNCTIONID
2432 as a function of type int (). Print a warning if appropriate. */
2435 implicitly_declare (functionid)
2439 int traditional_warning = 0;
2440 /* Only one "implicit declaration" warning per identifier. */
2441 int implicit_warning;
2443 /* We used to reuse an old implicit decl here,
2444 but this loses with inline functions because it can clobber
2445 the saved decl chains. */
2447 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2448 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2451 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2453 /* Warn of implicit decl following explicit local extern decl.
2454 This is probably a program designed for traditional C. */
2455 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2456 traditional_warning = 1;
2458 /* Warn once of an implicit declaration. */
2459 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2461 DECL_EXTERNAL (decl) = 1;
2462 TREE_PUBLIC (decl) = 1;
2464 /* Record that we have an implicit decl and this is it. */
2465 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2467 /* ANSI standard says implicit declarations are in the innermost block.
2468 So we record the decl in the standard fashion. */
2471 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2472 maybe_objc_check_decl (decl);
2474 rest_of_decl_compilation (decl, NULL, 0, 0);
2476 if (implicit_warning)
2477 implicit_decl_warning (functionid);
2478 else if (warn_traditional && traditional_warning)
2479 warning ("function `%s' was previously declared within a block",
2480 IDENTIFIER_POINTER (functionid));
2482 /* Write a record describing this implicit function declaration to the
2483 prototypes file (if requested). */
2485 gen_aux_info_record (decl, 0, 1, 0);
2487 /* Possibly apply some default attributes to this implicit declaration. */
2488 decl_attributes (&decl, NULL_TREE, 0);
2494 implicit_decl_warning (id)
2497 const char *name = IDENTIFIER_POINTER (id);
2498 if (mesg_implicit_function_declaration == 2)
2499 error ("implicit declaration of function `%s'", name);
2500 else if (mesg_implicit_function_declaration == 1)
2501 warning ("implicit declaration of function `%s'", name);
2504 /* Return zero if the declaration NEWDECL is valid
2505 when the declaration OLDDECL (assumed to be for the same name)
2506 has already been seen.
2507 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2508 and 3 if it is a conflicting declaration. */
2511 redeclaration_error_message (newdecl, olddecl)
2512 tree newdecl, olddecl;
2514 if (TREE_CODE (newdecl) == TYPE_DECL)
2516 /* Do not complain about type redeclarations where at least one
2517 declaration was in a system header. */
2518 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2522 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2524 /* Declarations of functions can insist on internal linkage
2525 but they can't be inconsistent with internal linkage,
2526 so there can be no error on that account.
2527 However defining the same name twice is no good. */
2528 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2529 /* However, defining once as extern inline and a second
2530 time in another way is ok. */
2531 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2532 && ! (DECL_DECLARED_INLINE_P (newdecl)
2533 && DECL_EXTERNAL (newdecl))))
2537 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2539 /* Objects declared at top level: */
2540 /* If at least one is a reference, it's ok. */
2541 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2543 /* Reject two definitions. */
2544 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2546 /* Now we have two tentative defs, or one tentative and one real def. */
2547 /* Insist that the linkage match. */
2548 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2552 else if (current_binding_level->parm_flag
2553 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2557 /* Newdecl has block scope. If olddecl has block scope also, then
2558 reject two definitions, and reject a definition together with an
2559 external reference. Otherwise, it is OK, because newdecl must
2560 be an extern reference to olddecl. */
2561 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2562 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2568 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2569 Create one if none exists so far for the current function.
2570 This function is called for both label definitions and label references. */
2576 tree decl = IDENTIFIER_LABEL_VALUE (id);
2578 if (current_function_decl == 0)
2580 error ("label %s referenced outside of any function",
2581 IDENTIFIER_POINTER (id));
2585 /* Use a label already defined or ref'd with this name. */
2588 /* But not if it is inherited and wasn't declared to be inheritable. */
2589 if (DECL_CONTEXT (decl) != current_function_decl
2590 && ! C_DECLARED_LABEL_FLAG (decl))
2591 return shadow_label (id);
2595 decl = build_decl (LABEL_DECL, id, void_type_node);
2597 /* A label not explicitly declared must be local to where it's ref'd. */
2598 DECL_CONTEXT (decl) = current_function_decl;
2600 DECL_MODE (decl) = VOIDmode;
2602 /* Say where one reference is to the label,
2603 for the sake of the error if it is not defined. */
2604 DECL_SOURCE_LINE (decl) = lineno;
2605 DECL_SOURCE_FILE (decl) = input_filename;
2607 IDENTIFIER_LABEL_VALUE (id) = decl;
2609 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2614 /* Make a label named NAME in the current function,
2615 shadowing silently any that may be inherited from containing functions
2616 or containing scopes.
2618 Note that valid use, if the label being shadowed
2619 comes from another scope in the same function,
2620 requires calling declare_nonlocal_label right away. */
2626 tree decl = IDENTIFIER_LABEL_VALUE (name);
2632 /* Check to make sure that the label hasn't already been declared
2633 at this label scope */
2634 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2635 if (TREE_VALUE (dup) == decl)
2637 error ("duplicate label declaration `%s'",
2638 IDENTIFIER_POINTER (name));
2639 error_with_decl (TREE_VALUE (dup),
2640 "this is a previous declaration");
2641 /* Just use the previous declaration. */
2642 return lookup_label (name);
2645 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2646 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2649 return lookup_label (name);
2652 /* Define a label, specifying the location in the source file.
2653 Return the LABEL_DECL node for the label, if the definition is valid.
2654 Otherwise return 0. */
2657 define_label (filename, line, name)
2658 const char *filename;
2662 tree decl = lookup_label (name);
2664 /* If label with this name is known from an outer context, shadow it. */
2665 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2667 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2668 IDENTIFIER_LABEL_VALUE (name) = 0;
2669 decl = lookup_label (name);
2672 if (warn_traditional && !in_system_header && lookup_name (name))
2673 warning_with_file_and_line (filename, line,
2674 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2675 IDENTIFIER_POINTER (name));
2677 if (DECL_INITIAL (decl) != 0)
2679 error_with_file_and_line (filename, line, "duplicate label `%s'",
2680 IDENTIFIER_POINTER (name));
2685 /* Mark label as having been defined. */
2686 DECL_INITIAL (decl) = error_mark_node;
2687 /* Say where in the source. */
2688 DECL_SOURCE_FILE (decl) = filename;
2689 DECL_SOURCE_LINE (decl) = line;
2694 /* Return the list of declarations of the current level.
2695 Note that this list is in reverse order unless/until
2696 you nreverse it; and when you do nreverse it, you must
2697 store the result back using `storedecls' or you will lose. */
2702 return current_binding_level->names;
2705 /* Return the list of type-tags (for structs, etc) of the current level. */
2710 return current_binding_level->tags;
2713 /* Store the list of declarations of the current level.
2714 This is done for the parameter declarations of a function being defined,
2715 after they are modified in the light of any missing parameters. */
2721 current_binding_level->names = decls;
2724 /* Similarly, store the list of tags of the current level. */
2730 current_binding_level->tags = tags;
2733 /* Given NAME, an IDENTIFIER_NODE,
2734 return the structure (or union or enum) definition for that name.
2735 Searches binding levels from BINDING_LEVEL up to the global level.
2736 If THISLEVEL_ONLY is nonzero, searches only the specified context
2737 (but skips any tag-transparent contexts to find one that is
2738 meaningful for tags).
2739 CODE says which kind of type the caller wants;
2740 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2741 If the wrong kind of type is found, an error is reported. */
2744 lookup_tag (code, name, binding_level, thislevel_only)
2745 enum tree_code code;
2746 struct binding_level *binding_level;
2750 struct binding_level *level;
2753 for (level = binding_level; level; level = level->level_chain)
2756 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2758 if (TREE_PURPOSE (tail) == name)
2760 if (TREE_CODE (TREE_VALUE (tail)) != code)
2762 /* Definition isn't the kind we were looking for. */
2763 pending_invalid_xref = name;
2764 pending_invalid_xref_file = input_filename;
2765 pending_invalid_xref_line = lineno;
2766 /* If in the same binding level as a declaration as a tag
2767 of a different type, this must not be allowed to
2768 shadow that tag, so give the error immediately.
2769 (For example, "struct foo; union foo;" is invalid.) */
2771 pending_xref_error ();
2773 return TREE_VALUE (tail);
2776 if (! level->tag_transparent)
2786 /* Print an error message now
2787 for a recent invalid struct, union or enum cross reference.
2788 We don't print them immediately because they are not invalid
2789 when used in the `struct foo;' construct for shadowing. */
2792 pending_xref_error ()
2794 if (pending_invalid_xref != 0)
2795 error_with_file_and_line (pending_invalid_xref_file,
2796 pending_invalid_xref_line,
2797 "`%s' defined as wrong kind of tag",
2798 IDENTIFIER_POINTER (pending_invalid_xref));
2799 pending_invalid_xref = 0;
2802 /* Given a type, find the tag that was defined for it and return the tag name.
2803 Otherwise return 0. */
2806 lookup_tag_reverse (type)
2809 struct binding_level *level;
2811 for (level = current_binding_level; level; level = level->level_chain)
2814 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2816 if (TREE_VALUE (tail) == type)
2817 return TREE_PURPOSE (tail);
2823 /* Look up NAME in the current binding level and its superiors
2824 in the namespace of variables, functions and typedefs.
2825 Return a ..._DECL node of some kind representing its definition,
2826 or return 0 if it is undefined. */
2834 if (current_binding_level != global_binding_level
2835 && IDENTIFIER_LOCAL_VALUE (name))
2836 val = IDENTIFIER_LOCAL_VALUE (name);
2838 val = IDENTIFIER_GLOBAL_VALUE (name);
2842 /* Similar to `lookup_name' but look only at current binding level. */
2845 lookup_name_current_level (name)
2850 if (current_binding_level == global_binding_level)
2851 return IDENTIFIER_GLOBAL_VALUE (name);
2853 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2856 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2857 if (DECL_NAME (t) == name)
2863 /* Create the predefined scalar types of C,
2864 and some nodes representing standard constants (0, 1, (void *) 0).
2865 Initialize the global binding level.
2866 Make definitions for built-in primitive functions. */
2869 c_init_decl_processing ()
2872 tree ptr_ftype_void, ptr_ftype_ptr;
2874 /* Adds some ggc roots, and reserved words for c-parse.in. */
2877 current_function_decl = NULL;
2878 named_labels = NULL;
2879 current_binding_level = NULL_BINDING_LEVEL;
2880 free_binding_level = NULL_BINDING_LEVEL;
2882 /* Make the binding_level structure for global names. */
2884 global_binding_level = current_binding_level;
2886 build_common_tree_nodes (flag_signed_char);
2888 c_common_nodes_and_builtins ();
2890 boolean_type_node = integer_type_node;
2891 boolean_true_node = integer_one_node;
2892 boolean_false_node = integer_zero_node;
2894 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2895 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2896 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2897 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2898 TYPE_PRECISION (c_bool_type_node) = 1;
2899 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2901 c_bool_false_node = build_int_2 (0, 0);
2902 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2903 c_bool_true_node = build_int_2 (1, 0);
2904 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2906 endlink = void_list_node;
2907 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2909 = build_function_type (ptr_type_node,
2910 tree_cons (NULL_TREE, ptr_type_node, endlink));
2912 pedantic_lvalues = pedantic;
2914 make_fname_decl = c_make_fname_decl;
2915 start_fname_decls ();
2918 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2919 decl, NAME is the initialization string and TYPE_DEP indicates whether
2920 NAME depended on the type of the function. As we don't yet implement
2921 delayed emission of static data, we mark the decl as emitted
2922 so it is not placed in the output. Anything using it must therefore pull
2923 out the STRING_CST initializer directly. This does mean that these names
2924 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2927 c_make_fname_decl (id, type_dep)
2931 const char *name = fname_as_string (type_dep);
2932 tree decl, type, init;
2933 size_t length = strlen (name);
2935 type = build_array_type
2936 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2937 build_index_type (size_int (length)));
2939 decl = build_decl (VAR_DECL, id, type);
2940 /* We don't push the decl, so have to set its context here. */
2941 DECL_CONTEXT (decl) = current_function_decl;
2943 TREE_STATIC (decl) = 1;
2944 TREE_READONLY (decl) = 1;
2945 DECL_ARTIFICIAL (decl) = 1;
2947 init = build_string (length + 1, name);
2948 TREE_TYPE (init) = type;
2949 DECL_INITIAL (decl) = init;
2951 TREE_USED (decl) = 1;
2953 finish_decl (decl, init, NULL_TREE);
2958 /* Return a definition for a builtin function named NAME and whose data type
2959 is TYPE. TYPE should be a function type with argument types.
2960 FUNCTION_CODE tells later passes how to compile calls to this function.
2961 See tree.h for its possible values.
2963 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2964 the name to be called if we can't opencode the function. If
2965 ATTRS is nonzero, use that for the function's attribute list. */
2968 builtin_function (name, type, function_code, class, library_name, attrs)
2972 enum built_in_class class;
2973 const char *library_name;
2976 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2977 DECL_EXTERNAL (decl) = 1;
2978 TREE_PUBLIC (decl) = 1;
2980 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
2981 make_decl_rtl (decl, NULL);
2983 DECL_BUILT_IN_CLASS (decl) = class;
2984 DECL_FUNCTION_CODE (decl) = function_code;
2986 /* The return builtins leave the current function. */
2987 if (function_code == BUILT_IN_RETURN || function_code == BUILT_IN_EH_RETURN)
2988 TREE_THIS_VOLATILE (decl) = 1;
2990 /* Warn if a function in the namespace for users
2991 is used without an occasion to consider it declared. */
2992 if (name[0] != '_' || name[1] != '_')
2993 C_DECL_ANTICIPATED (decl) = 1;
2995 /* Possibly apply some default attributes to this built-in function. */
2997 decl_attributes (&decl, attrs, ATTR_FLAG_BUILT_IN);
2999 decl_attributes (&decl, NULL_TREE, 0);
3004 /* Apply default attributes to a function, if a system function with default
3008 c_insert_default_attributes (decl)
3011 if (!TREE_PUBLIC (decl))
3013 c_common_insert_default_attributes (decl);
3016 /* Called when a declaration is seen that contains no names to declare.
3017 If its type is a reference to a structure, union or enum inherited
3018 from a containing scope, shadow that tag name for the current scope
3019 with a forward reference.
3020 If its type defines a new named structure or union
3021 or defines an enum, it is valid but we need not do anything here.
3022 Otherwise, it is an error. */
3025 shadow_tag (declspecs)
3028 shadow_tag_warned (declspecs, 0);
3032 shadow_tag_warned (declspecs, warned)
3035 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3042 pending_invalid_xref = 0;
3044 /* Remove the attributes from declspecs, since they will confuse the
3046 split_specs_attrs (declspecs, &specs, &attrs);
3048 for (link = specs; link; link = TREE_CHAIN (link))
3050 tree value = TREE_VALUE (link);
3051 enum tree_code code = TREE_CODE (value);
3053 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3054 /* Used to test also that TYPE_SIZE (value) != 0.
3055 That caused warning for `struct foo;' at top level in the file. */
3057 tree name = lookup_tag_reverse (value);
3064 if (warned != 1 && code != ENUMERAL_TYPE)
3065 /* Empty unnamed enum OK */
3067 pedwarn ("unnamed struct/union that defines no instances");
3073 t = lookup_tag (code, name, current_binding_level, 1);
3077 t = make_node (code);
3084 if (!warned && ! in_system_header)
3086 warning ("useless keyword or type name in empty declaration");
3093 error ("two types specified in one empty declaration");
3098 pedwarn ("empty declaration");
3102 /* Construct an array declarator. EXPR is the expression inside [], or
3103 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3104 to the pointer to which a parameter array is converted). STATIC_P is
3105 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3106 is non-zero is the array is [*], a VLA of unspecified length which is
3107 nevertheless a complete type (not currently implemented by GCC),
3108 zero otherwise. The declarator is constructed as an ARRAY_REF
3109 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3110 left of the [] (filled by in set_array_declarator_type) and operand 1
3111 is the expression inside; whose TREE_TYPE is the type qualifiers and
3112 which has TREE_STATIC set if "static" is used. */
3115 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3122 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3123 TREE_TYPE (decl) = quals;
3124 TREE_STATIC (decl) = (static_p ? 1 : 0);
3125 if (pedantic && !flag_isoc99)
3127 if (static_p || quals != NULL_TREE)
3128 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3130 pedwarn ("ISO C89 does not support `[*]' array declarators");
3133 warning ("GCC does not yet properly implement `[*]' array declarators");
3137 /* Set the type of an array declarator. DECL is the declarator, as
3138 constructed by build_array_declarator; TYPE is what appears on the left
3139 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3140 abstract declarator, zero otherwise; this is used to reject static and
3141 type qualifiers in abstract declarators, where they are not in the
3145 set_array_declarator_type (decl, type, abstract_p)
3150 TREE_OPERAND (decl, 0) = type;
3151 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3152 error ("static or type qualifiers in abstract declarator");
3156 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3159 groktypename (typename)
3164 if (TREE_CODE (typename) != TREE_LIST)
3167 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3169 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
3171 /* Apply attributes. */
3172 decl_attributes (&typename, attrs, 0);
3177 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3180 groktypename_in_parm_context (typename)
3183 if (TREE_CODE (typename) != TREE_LIST)
3185 return grokdeclarator (TREE_VALUE (typename),
3186 TREE_PURPOSE (typename),
3190 /* Decode a declarator in an ordinary declaration or data definition.
3191 This is called as soon as the type information and variable name
3192 have been parsed, before parsing the initializer if any.
3193 Here we create the ..._DECL node, fill in its type,
3194 and put it on the list of decls for the current context.
3195 The ..._DECL node is returned as the value.
3197 Exception: for arrays where the length is not specified,
3198 the type is left null, to be filled in by `finish_decl'.
3200 Function definitions do not come here; they go to start_function
3201 instead. However, external and forward declarations of functions
3202 do go through here. Structure field declarations are done by
3203 grokfield and not through here. */
3206 start_decl (declarator, declspecs, initialized, attributes)
3207 tree declarator, declspecs;
3214 /* An object declared as __attribute__((deprecated)) suppresses
3215 warnings of uses of other deprecated items. */
3216 if (lookup_attribute ("deprecated", attributes))
3217 deprecated_state = DEPRECATED_SUPPRESS;
3219 decl = grokdeclarator (declarator, declspecs,
3220 NORMAL, initialized);
3222 deprecated_state = DEPRECATED_NORMAL;
3224 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3225 && MAIN_NAME_P (DECL_NAME (decl)))
3226 warning_with_decl (decl, "`%s' is usually a function");
3229 /* Is it valid for this decl to have an initializer at all?
3230 If not, set INITIALIZED to zero, which will indirectly
3231 tell `finish_decl' to ignore the initializer once it is parsed. */
3232 switch (TREE_CODE (decl))
3235 /* typedef foo = bar means give foo the same type as bar.
3236 We haven't parsed bar yet, so `finish_decl' will fix that up.
3237 Any other case of an initialization in a TYPE_DECL is an error. */
3238 if (pedantic || list_length (declspecs) > 1)
3240 error ("typedef `%s' is initialized",
3241 IDENTIFIER_POINTER (DECL_NAME (decl)));
3247 error ("function `%s' is initialized like a variable",
3248 IDENTIFIER_POINTER (DECL_NAME (decl)));
3253 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3254 error ("parameter `%s' is initialized",
3255 IDENTIFIER_POINTER (DECL_NAME (decl)));
3260 /* Don't allow initializations for incomplete types
3261 except for arrays which might be completed by the initialization. */
3263 /* This can happen if the array size is an undefined macro. We already
3264 gave a warning, so we don't need another one. */
3265 if (TREE_TYPE (decl) == error_mark_node)
3267 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3269 /* A complete type is ok if size is fixed. */
3271 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3272 || C_DECL_VARIABLE_SIZE (decl))
3274 error ("variable-sized object may not be initialized");
3278 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3280 error ("variable `%s' has initializer but incomplete type",
3281 IDENTIFIER_POINTER (DECL_NAME (decl)));
3284 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3286 error ("elements of array `%s' have incomplete type",
3287 IDENTIFIER_POINTER (DECL_NAME (decl)));
3295 /* Seems redundant with grokdeclarator. */
3296 if (current_binding_level != global_binding_level
3297 && DECL_EXTERNAL (decl)
3298 && TREE_CODE (decl) != FUNCTION_DECL)
3299 warning ("declaration of `%s' has `extern' and is initialized",
3300 IDENTIFIER_POINTER (DECL_NAME (decl)));
3302 DECL_EXTERNAL (decl) = 0;
3303 if (current_binding_level == global_binding_level)
3304 TREE_STATIC (decl) = 1;
3306 /* Tell `pushdecl' this is an initialized decl
3307 even though we don't yet have the initializer expression.
3308 Also tell `finish_decl' it may store the real initializer. */
3309 DECL_INITIAL (decl) = error_mark_node;
3312 /* If this is a function declaration, write a record describing it to the
3313 prototypes file (if requested). */
3315 if (TREE_CODE (decl) == FUNCTION_DECL)
3316 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3318 /* ANSI specifies that a tentative definition which is not merged with
3319 a non-tentative definition behaves exactly like a definition with an
3320 initializer equal to zero. (Section 3.7.2)
3322 -fno-common gives strict ANSI behavior, though this tends to break
3323 a large body of code that grew up without this rule.
3325 Thread-local variables are never common, since there's no entrenched
3326 body of code to break, and it allows more efficient variable references
3327 in the presense of dynamic linking. */
3329 if (TREE_CODE (decl) == VAR_DECL
3331 && TREE_PUBLIC (decl)
3332 && !DECL_THREAD_LOCAL (decl)
3334 DECL_COMMON (decl) = 1;
3336 /* Set attributes here so if duplicate decl, will have proper attributes. */
3337 decl_attributes (&decl, attributes, 0);
3339 /* If #pragma weak was used, mark the decl weak now. */
3340 if (current_binding_level == global_binding_level)
3341 maybe_apply_pragma_weak (decl);
3343 if (TREE_CODE (decl) == FUNCTION_DECL
3344 && DECL_DECLARED_INLINE_P (decl)
3345 && DECL_UNINLINABLE (decl)
3346 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3347 warning_with_decl (decl,
3348 "inline function `%s' given attribute noinline");
3350 /* Add this decl to the current binding level.
3351 TEM may equal DECL or it may be a previous decl of the same name. */
3352 tem = pushdecl (decl);
3354 /* For a local variable, define the RTL now. */
3355 if (current_binding_level != global_binding_level
3356 /* But not if this is a duplicate decl
3357 and we preserved the rtl from the previous one
3358 (which may or may not happen). */
3359 && !DECL_RTL_SET_P (tem)
3360 && !DECL_CONTEXT (tem))
3362 if (TREE_TYPE (tem) != error_mark_node
3363 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3365 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3366 && DECL_INITIAL (tem) != 0)
3373 /* Finish processing of a declaration;
3374 install its initial value.
3375 If the length of an array type is not known before,
3376 it must be determined now, from the initial value, or it is an error. */
3379 finish_decl (decl, init, asmspec_tree)
3383 tree type = TREE_TYPE (decl);
3384 int was_incomplete = (DECL_SIZE (decl) == 0);
3385 const char *asmspec = 0;
3387 /* If a name was specified, get the string. */
3388 if (current_binding_level == global_binding_level)
3389 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3391 asmspec = TREE_STRING_POINTER (asmspec_tree);
3393 /* If `start_decl' didn't like having an initialization, ignore it now. */
3394 if (init != 0 && DECL_INITIAL (decl) == 0)
3397 /* Don't crash if parm is initialized. */
3398 if (TREE_CODE (decl) == PARM_DECL)
3403 if (TREE_CODE (decl) != TYPE_DECL)
3404 store_init_value (decl, init);
3407 /* typedef foo = bar; store the type of bar as the type of foo. */
3408 TREE_TYPE (decl) = TREE_TYPE (init);
3409 DECL_INITIAL (decl) = init = 0;
3413 /* Deduce size of array from initialization, if not already known */
3414 if (TREE_CODE (type) == ARRAY_TYPE
3415 && TYPE_DOMAIN (type) == 0
3416 && TREE_CODE (decl) != TYPE_DECL)
3419 = (TREE_STATIC (decl)
3420 /* Even if pedantic, an external linkage array
3421 may have incomplete type at first. */
3422 ? pedantic && !TREE_PUBLIC (decl)
3423 : !DECL_EXTERNAL (decl));
3425 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3427 /* Get the completed type made by complete_array_type. */
3428 type = TREE_TYPE (decl);
3431 error_with_decl (decl, "initializer fails to determine size of `%s'");
3433 else if (failure == 2)
3436 error_with_decl (decl, "array size missing in `%s'");
3437 /* If a `static' var's size isn't known,
3438 make it extern as well as static, so it does not get
3440 If it is not `static', then do not mark extern;
3441 finish_incomplete_decl will give it a default size
3442 and it will get allocated. */
3443 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3444 DECL_EXTERNAL (decl) = 1;
3447 /* TYPE_MAX_VALUE is always one less than the number of elements
3448 in the array, because we start counting at zero. Therefore,
3449 warn only if the value is less than zero. */
3450 else if (pedantic && TYPE_DOMAIN (type) != 0
3451 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3452 error_with_decl (decl, "zero or negative size array `%s'");
3454 layout_decl (decl, 0);
3457 if (TREE_CODE (decl) == VAR_DECL)
3459 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3460 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3461 layout_decl (decl, 0);
3463 if (DECL_SIZE (decl) == 0
3464 /* Don't give an error if we already gave one earlier. */
3465 && TREE_TYPE (decl) != error_mark_node
3466 && (TREE_STATIC (decl)
3468 /* A static variable with an incomplete type
3469 is an error if it is initialized.
3470 Also if it is not file scope.
3471 Otherwise, let it through, but if it is not `extern'
3472 then it may cause an error message later. */
3473 (DECL_INITIAL (decl) != 0
3474 || DECL_CONTEXT (decl) != 0)
3476 /* An automatic variable with an incomplete type
3478 !DECL_EXTERNAL (decl)))
3480 error_with_decl (decl, "storage size of `%s' isn't known");
3481 TREE_TYPE (decl) = error_mark_node;
3484 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3485 && DECL_SIZE (decl) != 0)
3487 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3488 constant_expression_warning (DECL_SIZE (decl));
3490 error_with_decl (decl, "storage size of `%s' isn't constant");
3493 if (TREE_USED (type))
3494 TREE_USED (decl) = 1;
3497 /* If this is a function and an assembler name is specified, it isn't
3498 builtin any more. Also reset DECL_RTL so we can give it its new
3500 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3502 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3503 SET_DECL_RTL (decl, NULL_RTX);
3504 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3507 /* Output the assembler code and/or RTL code for variables and functions,
3508 unless the type is an undefined structure or union.
3509 If not, it will get done when the type is completed. */
3511 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3513 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3514 maybe_objc_check_decl (decl);
3516 if (!DECL_CONTEXT (decl))
3518 if (DECL_INITIAL (decl) == NULL_TREE
3519 || DECL_INITIAL (decl) == error_mark_node)
3520 /* Don't output anything
3521 when a tentative file-scope definition is seen.
3522 But at end of compilation, do output code for them. */
3523 DECL_DEFER_OUTPUT (decl) = 1;
3524 rest_of_decl_compilation (decl, asmspec,
3525 (DECL_CONTEXT (decl) == 0
3526 || TREE_ASM_WRITTEN (decl)), 0);
3530 /* This is a local variable. If there is an ASMSPEC, the
3531 user has requested that we handle it specially. */
3534 /* In conjunction with an ASMSPEC, the `register'
3535 keyword indicates that we should place the variable
3536 in a particular register. */
3537 if (DECL_REGISTER (decl))
3538 DECL_C_HARD_REGISTER (decl) = 1;
3540 /* If this is not a static variable, issue a warning.
3541 It doesn't make any sense to give an ASMSPEC for an
3542 ordinary, non-register local variable. Historically,
3543 GCC has accepted -- but ignored -- the ASMSPEC in
3545 if (TREE_CODE (decl) == VAR_DECL
3546 && !DECL_REGISTER (decl)
3547 && !TREE_STATIC (decl))
3548 warning_with_decl (decl,
3549 "ignoring asm-specifier for non-static local variable `%s'");
3551 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3554 if (TREE_CODE (decl) != FUNCTION_DECL)
3555 add_decl_stmt (decl);
3558 if (DECL_CONTEXT (decl) != 0)
3560 /* Recompute the RTL of a local array now
3561 if it used to be an incomplete type. */
3563 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3565 /* If we used it already as memory, it must stay in memory. */
3566 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3567 /* If it's still incomplete now, no init will save it. */
3568 if (DECL_SIZE (decl) == 0)
3569 DECL_INITIAL (decl) = 0;
3574 if (TREE_CODE (decl) == TYPE_DECL)
3576 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3577 maybe_objc_check_decl (decl);
3578 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3581 /* At the end of a declaration, throw away any variable type sizes
3582 of types defined inside that declaration. There is no use
3583 computing them in the following function definition. */
3584 if (current_binding_level == global_binding_level)
3585 get_pending_sizes ();
3588 /* Given a parsed parameter declaration,
3589 decode it into a PARM_DECL and push that on the current binding level.
3590 Also, for the sake of forward parm decls,
3591 record the given order of parms in `parm_order'. */
3594 push_parm_decl (parm)
3598 int old_immediate_size_expand = immediate_size_expand;
3599 /* Don't try computing parm sizes now -- wait till fn is called. */
3600 immediate_size_expand = 0;
3602 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3603 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3604 decl_attributes (&decl, TREE_VALUE (parm), 0);
3607 if (DECL_NAME (decl))
3610 olddecl = lookup_name (DECL_NAME (decl));
3611 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3612 pedwarn_with_decl (decl,
3613 "ISO C forbids parameter `%s' shadowing typedef");
3617 decl = pushdecl (decl);
3619 immediate_size_expand = old_immediate_size_expand;
3621 current_binding_level->parm_order
3622 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3624 /* Add this decl to the current binding level. */
3625 finish_decl (decl, NULL_TREE, NULL_TREE);
3628 /* Clear the given order of parms in `parm_order'.
3629 Used at start of parm list,
3630 and also at semicolon terminating forward decls. */
3635 current_binding_level->parm_order = NULL_TREE;
3638 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3639 literal, which may be an incomplete array type completed by the
3640 initializer; INIT is a CONSTRUCTOR that initializes the compound
3644 build_compound_literal (type, init)
3648 /* We do not use start_decl here because we have a type, not a declarator;
3649 and do not use finish_decl because the decl should be stored inside
3650 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3651 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3654 DECL_EXTERNAL (decl) = 0;
3655 TREE_PUBLIC (decl) = 0;
3656 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3657 DECL_CONTEXT (decl) = current_function_decl;
3658 TREE_USED (decl) = 1;
3659 TREE_TYPE (decl) = type;
3660 store_init_value (decl, init);
3662 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3664 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3669 type = TREE_TYPE (decl);
3670 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3671 return error_mark_node;
3673 stmt = build_stmt (DECL_STMT, decl);
3674 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3675 TREE_SIDE_EFFECTS (complit) = 1;
3677 layout_decl (decl, 0);
3679 if (TREE_STATIC (decl))
3681 /* This decl needs a name for the assembler output. We also need
3682 a unique suffix to be added to the name, for which DECL_CONTEXT
3684 DECL_NAME (decl) = get_identifier ("__compound_literal");
3685 DECL_CONTEXT (decl) = complit;
3686 rest_of_decl_compilation (decl, NULL, 1, 0);
3687 DECL_CONTEXT (decl) = NULL_TREE;
3693 /* Make TYPE a complete type based on INITIAL_VALUE.
3694 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3695 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3698 complete_array_type (type, initial_value, do_default)
3703 tree maxindex = NULL_TREE;
3708 /* Note MAXINDEX is really the maximum index,
3709 one less than the size. */
3710 if (TREE_CODE (initial_value) == STRING_CST)
3713 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3714 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3717 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3719 tree elts = CONSTRUCTOR_ELTS (initial_value);
3720 maxindex = build_int_2 (-1, -1);
3721 for (; elts; elts = TREE_CHAIN (elts))
3723 if (TREE_PURPOSE (elts))
3724 maxindex = TREE_PURPOSE (elts);
3726 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3727 maxindex, integer_one_node));
3729 maxindex = copy_node (maxindex);
3733 /* Make an error message unless that happened already. */
3734 if (initial_value != error_mark_node)
3737 /* Prevent further error messages. */
3738 maxindex = build_int_2 (0, 0);
3745 maxindex = build_int_2 (0, 0);
3751 TYPE_DOMAIN (type) = build_index_type (maxindex);
3752 if (!TREE_TYPE (maxindex))
3753 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3756 /* Lay out the type now that we can get the real answer. */
3763 /* Given declspecs and a declarator,
3764 determine the name and type of the object declared
3765 and construct a ..._DECL node for it.
3766 (In one case we can return a ..._TYPE node instead.
3767 For invalid input we sometimes return 0.)
3769 DECLSPECS is a chain of tree_list nodes whose value fields
3770 are the storage classes and type specifiers.
3772 DECL_CONTEXT says which syntactic context this declaration is in:
3773 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3774 FUNCDEF for a function definition. Like NORMAL but a few different
3775 error messages in each case. Return value may be zero meaning
3776 this definition is too screwy to try to parse.
3777 PARM for a parameter declaration (either within a function prototype
3778 or before a function body). Make a PARM_DECL, or return void_type_node.
3779 TYPENAME if for a typename (in a cast or sizeof).
3780 Don't make a DECL node; just return the ..._TYPE node.
3781 FIELD for a struct or union field; make a FIELD_DECL.
3782 BITFIELD for a field with specified width.
3783 INITIALIZED is 1 if the decl has an initializer.
3785 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3786 It may also be so in the PARM case, for a prototype where the
3787 argument type is specified but not the name.
3789 This function is where the complicated C meanings of `static'
3790 and `extern' are interpreted. */
3793 grokdeclarator (declarator, declspecs, decl_context, initialized)
3796 enum decl_context decl_context;
3801 tree type = NULL_TREE;
3806 int type_quals = TYPE_UNQUALIFIED;
3808 int explicit_int = 0;
3809 int explicit_char = 0;
3810 int defaulted_int = 0;
3811 tree typedef_decl = 0;
3813 tree typedef_type = 0;
3814 int funcdef_flag = 0;
3815 enum tree_code innermost_code = ERROR_MARK;
3817 int size_varies = 0;
3818 tree decl_attr = NULL_TREE;
3819 tree array_ptr_quals = NULL_TREE;
3820 int array_parm_static = 0;
3821 tree returned_attrs = NULL_TREE;
3823 if (decl_context == BITFIELD)
3824 bitfield = 1, decl_context = FIELD;
3826 if (decl_context == FUNCDEF)
3827 funcdef_flag = 1, decl_context = NORMAL;
3829 /* Look inside a declarator for the name being declared
3830 and get it as a string, for an error message. */
3832 tree decl = declarator;
3836 switch (TREE_CODE (decl))
3841 innermost_code = TREE_CODE (decl);
3842 decl = TREE_OPERAND (decl, 0);
3846 decl = TREE_VALUE (decl);
3849 case IDENTIFIER_NODE:
3850 name = IDENTIFIER_POINTER (decl);
3861 /* A function definition's declarator must have the form of
3862 a function declarator. */
3864 if (funcdef_flag && innermost_code != CALL_EXPR)
3867 /* Anything declared one level down from the top level
3868 must be one of the parameters of a function
3869 (because the body is at least two levels down). */
3871 /* If this looks like a function definition, make it one,
3872 even if it occurs where parms are expected.
3873 Then store_parm_decls will reject it and not use it as a parm. */
3874 if (decl_context == NORMAL && !funcdef_flag
3875 && current_binding_level->parm_flag)
3876 decl_context = PARM;
3878 /* Look through the decl specs and record which ones appear.
3879 Some typespecs are defined as built-in typenames.
3880 Others, the ones that are modifiers of other types,
3881 are represented by bits in SPECBITS: set the bits for
3882 the modifiers that appear. Storage class keywords are also in SPECBITS.
3884 If there is a typedef name or a type, store the type in TYPE.
3885 This includes builtin typedefs such as `int'.
3887 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3888 and did not come from a user typedef.
3890 Set LONGLONG if `long' is mentioned twice. */
3892 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3894 tree id = TREE_VALUE (spec);
3896 /* If the entire declaration is itself tagged as deprecated then
3897 suppress reports of deprecated items. */
3898 if (id && TREE_DEPRECATED (id))
3900 if (deprecated_state != DEPRECATED_SUPPRESS)
3901 warn_deprecated_use (id);
3904 if (id == ridpointers[(int) RID_INT])
3906 if (id == ridpointers[(int) RID_CHAR])
3909 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3911 enum rid i = C_RID_CODE (id);
3912 if ((int) i <= (int) RID_LAST_MODIFIER)
3914 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3917 error ("`long long long' is too long for GCC");
3920 if (pedantic && !flag_isoc99 && ! in_system_header
3922 pedwarn ("ISO C89 does not support `long long'");
3926 else if (specbits & (1 << (int) i))
3927 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3929 /* Diagnose "__thread extern". Recall that this list
3930 is in the reverse order seen in the text. */
3932 && (specbits & (1 << (int) RID_EXTERN
3933 | 1 << (int) RID_STATIC)))
3935 if (specbits & 1 << (int) RID_EXTERN)
3936 error ("`__thread' before `extern'");
3938 error ("`__thread' before `static'");
3941 specbits |= 1 << (int) i;
3946 error ("two or more data types in declaration of `%s'", name);
3947 /* Actual typedefs come to us as TYPE_DECL nodes. */
3948 else if (TREE_CODE (id) == TYPE_DECL)
3950 if (TREE_TYPE (id) == error_mark_node)
3951 ; /* Allow the type to default to int to avoid cascading errors. */
3954 type = TREE_TYPE (id);
3955 decl_attr = DECL_ATTRIBUTES (id);
3959 /* Built-in types come as identifiers. */
3960 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3962 tree t = lookup_name (id);
3963 if (TREE_TYPE (t) == error_mark_node)
3965 else if (!t || TREE_CODE (t) != TYPE_DECL)
3966 error ("`%s' fails to be a typedef or built in type",
3967 IDENTIFIER_POINTER (id));
3970 type = TREE_TYPE (t);
3974 else if (TREE_CODE (id) != ERROR_MARK)
3981 typedef_type = type;
3983 size_varies = C_TYPE_VARIABLE_SIZE (type);
3985 /* No type at all: default to `int', and set DEFAULTED_INT
3986 because it was not a user-defined typedef. */
3990 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3991 | (1 << (int) RID_SIGNED)
3992 | (1 << (int) RID_UNSIGNED)
3993 | (1 << (int) RID_COMPLEX))))
3994 /* Don't warn about typedef foo = bar. */
3995 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
3996 && ! in_system_header)
3998 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3999 and this is a function, or if -Wimplicit; prefer the former
4000 warning since it is more explicit. */
4001 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4003 warn_about_return_type = 1;
4004 else if (warn_implicit_int || flag_isoc99)
4005 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4010 type = integer_type_node;
4013 /* Now process the modifiers that were specified
4014 and check for invalid combinations. */
4016 /* Long double is a special combination. */
4018 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4019 && TYPE_MAIN_VARIANT (type) == double_type_node)
4021 specbits &= ~(1 << (int) RID_LONG);
4022 type = long_double_type_node;
4025 /* Check all other uses of type modifiers. */
4027 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4028 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4032 if ((specbits & 1 << (int) RID_LONG)
4033 && (specbits & 1 << (int) RID_SHORT))
4034 error ("both long and short specified for `%s'", name);
4035 else if (((specbits & 1 << (int) RID_LONG)
4036 || (specbits & 1 << (int) RID_SHORT))
4038 error ("long or short specified with char for `%s'", name);
4039 else if (((specbits & 1 << (int) RID_LONG)
4040 || (specbits & 1 << (int) RID_SHORT))
4041 && TREE_CODE (type) == REAL_TYPE)
4043 static int already = 0;
4045 error ("long or short specified with floating type for `%s'", name);
4046 if (! already && ! pedantic)
4048 error ("the only valid combination is `long double'");
4052 else if ((specbits & 1 << (int) RID_SIGNED)
4053 && (specbits & 1 << (int) RID_UNSIGNED))
4054 error ("both signed and unsigned specified for `%s'", name);
4055 else if (TREE_CODE (type) != INTEGER_TYPE)
4056 error ("long, short, signed or unsigned invalid for `%s'", name);
4060 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4062 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4064 if (flag_pedantic_errors)
4069 /* Discard the type modifiers if they are invalid. */
4072 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4073 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4078 if ((specbits & (1 << (int) RID_COMPLEX))
4079 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4081 error ("complex invalid for `%s'", name);
4082 specbits &= ~(1 << (int) RID_COMPLEX);
4085 /* Decide whether an integer type is signed or not.
4086 Optionally treat bitfields as signed by default. */
4087 if (specbits & 1 << (int) RID_UNSIGNED
4088 || (bitfield && ! flag_signed_bitfields
4089 && (explicit_int || defaulted_int || explicit_char
4090 /* A typedef for plain `int' without `signed'
4091 can be controlled just like plain `int'. */
4092 || ! (typedef_decl != 0
4093 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4094 && TREE_CODE (type) != ENUMERAL_TYPE
4095 && !(specbits & 1 << (int) RID_SIGNED)))
4098 type = long_long_unsigned_type_node;
4099 else if (specbits & 1 << (int) RID_LONG)
4100 type = long_unsigned_type_node;
4101 else if (specbits & 1 << (int) RID_SHORT)
4102 type = short_unsigned_type_node;
4103 else if (type == char_type_node)
4104 type = unsigned_char_type_node;
4105 else if (typedef_decl)
4106 type = c_common_unsigned_type (type);
4108 type = unsigned_type_node;
4110 else if ((specbits & 1 << (int) RID_SIGNED)
4111 && type == char_type_node)
4112 type = signed_char_type_node;
4114 type = long_long_integer_type_node;
4115 else if (specbits & 1 << (int) RID_LONG)
4116 type = long_integer_type_node;
4117 else if (specbits & 1 << (int) RID_SHORT)
4118 type = short_integer_type_node;
4120 if (specbits & 1 << (int) RID_COMPLEX)
4122 if (pedantic && !flag_isoc99)
4123 pedwarn ("ISO C89 does not support complex types");
4124 /* If we just have "complex", it is equivalent to
4125 "complex double", but if any modifiers at all are specified it is
4126 the complex form of TYPE. E.g, "complex short" is
4127 "complex short int". */
4129 if (defaulted_int && ! longlong
4130 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4131 | (1 << (int) RID_SIGNED)
4132 | (1 << (int) RID_UNSIGNED))))
4135 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4136 type = complex_double_type_node;
4138 else if (type == integer_type_node)
4141 pedwarn ("ISO C does not support complex integer types");
4142 type = complex_integer_type_node;
4144 else if (type == float_type_node)
4145 type = complex_float_type_node;
4146 else if (type == double_type_node)
4147 type = complex_double_type_node;
4148 else if (type == long_double_type_node)
4149 type = complex_long_double_type_node;
4153 pedwarn ("ISO C does not support complex integer types");
4154 type = build_complex_type (type);
4158 /* Figure out the type qualifiers for the declaration. There are
4159 two ways a declaration can become qualified. One is something
4160 like `const int i' where the `const' is explicit. Another is
4161 something like `typedef const int CI; CI i' where the type of the
4162 declaration contains the `const'. */
4163 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4164 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4165 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4166 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4167 if (constp > 1 && ! flag_isoc99)
4168 pedwarn ("duplicate `const'");
4169 if (restrictp > 1 && ! flag_isoc99)
4170 pedwarn ("duplicate `restrict'");
4171 if (volatilep > 1 && ! flag_isoc99)
4172 pedwarn ("duplicate `volatile'");
4173 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4174 type = TYPE_MAIN_VARIANT (type);
4175 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4176 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4177 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4179 /* Warn if two storage classes are given. Default to `auto'. */
4184 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4185 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4186 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4187 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4188 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4190 /* "static __thread" and "extern __thread" are allowed. */
4191 if ((specbits & (1 << (int) RID_THREAD
4192 | 1 << (int) RID_STATIC
4193 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
4196 /* Warn about storage classes that are invalid for certain
4197 kinds of declarations (parameters, typenames, etc.). */
4200 error ("multiple storage classes in declaration of `%s'", name);
4201 else if (funcdef_flag
4203 & ((1 << (int) RID_REGISTER)
4204 | (1 << (int) RID_AUTO)
4205 | (1 << (int) RID_TYPEDEF)
4206 | (1 << (int) RID_THREAD))))
4208 if (specbits & 1 << (int) RID_AUTO
4209 && (pedantic || current_binding_level == global_binding_level))
4210 pedwarn ("function definition declared `auto'");
4211 if (specbits & 1 << (int) RID_REGISTER)
4212 error ("function definition declared `register'");
4213 if (specbits & 1 << (int) RID_TYPEDEF)
4214 error ("function definition declared `typedef'");
4215 if (specbits & 1 << (int) RID_THREAD)
4216 error ("function definition declared `__thread'");
4217 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4218 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
4220 else if (decl_context != NORMAL && nclasses > 0)
4222 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4226 switch (decl_context)
4229 error ("storage class specified for structure field `%s'",
4233 error ("storage class specified for parameter `%s'", name);
4236 error ("storage class specified for typename");
4239 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4240 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4241 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
4244 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4246 /* `extern' with initialization is invalid if not at top level. */
4247 if (current_binding_level == global_binding_level)
4248 warning ("`%s' initialized and declared `extern'", name);
4250 error ("`%s' has both `extern' and initializer", name);
4252 else if (current_binding_level == global_binding_level)
4254 if (specbits & 1 << (int) RID_AUTO)
4255 error ("top-level declaration of `%s' specifies `auto'", name);
4259 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
4260 error ("nested function `%s' declared `extern'", name);
4261 else if ((specbits & (1 << (int) RID_THREAD
4262 | 1 << (int) RID_EXTERN
4263 | 1 << (int) RID_STATIC))
4264 == (1 << (int) RID_THREAD))
4266 error ("function-scope `%s' implicitly auto and declared `__thread'",
4268 specbits &= ~(1 << (int) RID_THREAD);
4273 /* Now figure out the structure of the declarator proper.
4274 Descend through it, creating more complex types, until we reach
4275 the declared identifier (or NULL_TREE, in an absolute declarator). */
4277 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4279 if (type == error_mark_node)
4281 declarator = TREE_OPERAND (declarator, 0);
4285 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4286 an INDIRECT_REF (for *...),
4287 a CALL_EXPR (for ...(...)),
4288 a TREE_LIST (for nested attributes),
4289 an identifier (for the name being declared)
4290 or a null pointer (for the place in an absolute declarator
4291 where the name was omitted).
4292 For the last two cases, we have just exited the loop.
4294 At this point, TYPE is the type of elements of an array,
4295 or for a function to return, or for a pointer to point to.
4296 After this sequence of ifs, TYPE is the type of the
4297 array or function or pointer, and DECLARATOR has had its
4298 outermost layer removed. */
4300 if (array_ptr_quals != NULL_TREE || array_parm_static)
4302 /* Only the innermost declarator (making a parameter be of
4303 array type which is converted to pointer type)
4304 may have static or type qualifiers. */
4305 error ("static or type qualifiers in non-parameter array declarator");
4306 array_ptr_quals = NULL_TREE;
4307 array_parm_static = 0;
4310 if (TREE_CODE (declarator) == TREE_LIST)
4312 /* We encode a declarator with embedded attributes using
4314 tree attrs = TREE_PURPOSE (declarator);
4317 declarator = TREE_VALUE (declarator);
4318 inner_decl = declarator;
4319 while (inner_decl != NULL_TREE
4320 && TREE_CODE (inner_decl) == TREE_LIST)
4321 inner_decl = TREE_VALUE (inner_decl);
4322 if (inner_decl == NULL_TREE
4323 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4324 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4325 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4326 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4327 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4328 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4329 returned_attrs = decl_attributes (&type,
4330 chainon (returned_attrs, attrs),
4333 else if (TREE_CODE (declarator) == ARRAY_REF)
4335 tree itype = NULL_TREE;
4336 tree size = TREE_OPERAND (declarator, 1);
4337 /* The index is a signed object `sizetype' bits wide. */
4338 tree index_type = c_common_signed_type (sizetype);
4340 array_ptr_quals = TREE_TYPE (declarator);
4341 array_parm_static = TREE_STATIC (declarator);
4343 declarator = TREE_OPERAND (declarator, 0);
4345 /* Check for some types that there cannot be arrays of. */
4347 if (VOID_TYPE_P (type))
4349 error ("declaration of `%s' as array of voids", name);
4350 type = error_mark_node;
4353 if (TREE_CODE (type) == FUNCTION_TYPE)
4355 error ("declaration of `%s' as array of functions", name);
4356 type = error_mark_node;
4359 if (size == error_mark_node)
4360 type = error_mark_node;
4362 if (type == error_mark_node)
4365 /* If size was specified, set ITYPE to a range-type for that size.
4366 Otherwise, ITYPE remains null. finish_decl may figure it out
4367 from an initial value. */
4371 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4372 STRIP_TYPE_NOPS (size);
4374 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4376 error ("size of array `%s' has non-integer type", name);
4377 size = integer_one_node;
4380 if (pedantic && integer_zerop (size))
4381 pedwarn ("ISO C forbids zero-size array `%s'", name);
4383 if (TREE_CODE (size) == INTEGER_CST)
4385 constant_expression_warning (size);
4386 if (tree_int_cst_sgn (size) < 0)
4388 error ("size of array `%s' is negative", name);
4389 size = integer_one_node;
4394 /* Make sure the array size remains visibly nonconstant
4395 even if it is (eg) a const variable with known value. */
4398 if (!flag_isoc99 && pedantic)
4400 if (TREE_CONSTANT (size))
4401 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4404 pedwarn ("ISO C89 forbids variable-size array `%s'",
4409 if (integer_zerop (size))
4411 /* A zero-length array cannot be represented with an
4412 unsigned index type, which is what we'll get with
4413 build_index_type. Create an open-ended range instead. */
4414 itype = build_range_type (sizetype, size, NULL_TREE);
4418 /* Compute the maximum valid index, that is, size - 1.
4419 Do the calculation in index_type, so that if it is
4420 a variable the computations will be done in the
4422 itype = fold (build (MINUS_EXPR, index_type,
4423 convert (index_type, size),
4424 convert (index_type, size_one_node)));
4426 /* If that overflowed, the array is too big.
4427 ??? While a size of INT_MAX+1 technically shouldn't
4428 cause an overflow (because we subtract 1), the overflow
4429 is recorded during the conversion to index_type, before
4430 the subtraction. Handling this case seems like an
4431 unnecessary complication. */
4432 if (TREE_OVERFLOW (itype))
4434 error ("size of array `%s' is too large", name);
4435 type = error_mark_node;
4440 itype = variable_size (itype);
4441 itype = build_index_type (itype);
4444 else if (decl_context == FIELD)
4446 if (pedantic && !flag_isoc99 && !in_system_header)
4447 pedwarn ("ISO C89 does not support flexible array members");
4449 /* ISO C99 Flexible array members are effectively identical
4450 to GCC's zero-length array extension. */
4451 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4454 /* If pedantic, complain about arrays of incomplete types. */
4456 if (pedantic && !COMPLETE_TYPE_P (type))
4457 pedwarn ("array type has incomplete element type");
4460 /* We shouldn't have a function type here at all!
4461 Functions aren't allowed as array elements. */
4462 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4463 && (constp || volatilep))
4464 pedwarn ("ISO C forbids const or volatile function types");
4467 /* Build the array type itself, then merge any constancy or
4468 volatility into the target type. We must do it in this order
4469 to ensure that the TYPE_MAIN_VARIANT field of the array type
4470 is set correctly. */
4472 type = build_array_type (type, itype);
4474 type = c_build_qualified_type (type, type_quals);
4477 C_TYPE_VARIABLE_SIZE (type) = 1;
4479 /* The GCC extension for zero-length arrays differs from
4480 ISO flexible array members in that sizeof yields zero. */
4481 if (size && integer_zerop (size))
4484 TYPE_SIZE (type) = bitsize_zero_node;
4485 TYPE_SIZE_UNIT (type) = size_zero_node;
4487 if (decl_context != PARM
4488 && (array_ptr_quals != NULL_TREE || array_parm_static))
4490 error ("static or type qualifiers in non-parameter array declarator");
4491 array_ptr_quals = NULL_TREE;
4492 array_parm_static = 0;
4495 else if (TREE_CODE (declarator) == CALL_EXPR)
4499 /* Declaring a function type.
4500 Make sure we have a valid type for the function to return. */
4501 if (type == error_mark_node)
4506 /* Warn about some types functions can't return. */
4508 if (TREE_CODE (type) == FUNCTION_TYPE)
4510 error ("`%s' declared as function returning a function", name);
4511 type = integer_type_node;
4513 if (TREE_CODE (type) == ARRAY_TYPE)
4515 error ("`%s' declared as function returning an array", name);
4516 type = integer_type_node;
4519 /* Construct the function type and go to the next
4520 inner layer of declarator. */
4522 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4524 /* Say it's a definition
4525 only for the CALL_EXPR
4526 closest to the identifier. */
4527 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4528 /* Type qualifiers before the return type of the function
4529 qualify the return type, not the function type. */
4532 /* Type qualifiers on a function return type are normally
4533 permitted by the standard but have no effect, so give a
4534 warning at -W. Qualifiers on a void return type have
4535 meaning as a GNU extension, and are banned on function
4536 definitions in ISO C. FIXME: strictly we shouldn't
4537 pedwarn for qualified void return types except on function
4538 definitions, but not doing so could lead to the undesirable
4539 state of a "volatile void" function return type not being
4540 warned about, and a use of the function being compiled
4541 with GNU semantics, with no diagnostics under -pedantic. */
4542 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4543 pedwarn ("ISO C forbids qualified void function return type");
4544 else if (extra_warnings
4545 && !(VOID_TYPE_P (type)
4546 && type_quals == TYPE_QUAL_VOLATILE))
4547 warning ("type qualifiers ignored on function return type");
4549 type = c_build_qualified_type (type, type_quals);
4551 type_quals = TYPE_UNQUALIFIED;
4553 type = build_function_type (type, arg_types);
4554 declarator = TREE_OPERAND (declarator, 0);
4556 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4557 the formal parameter list of this FUNCTION_TYPE to point to
4558 the FUNCTION_TYPE node itself. */
4563 for (link = last_function_parm_tags;
4565 link = TREE_CHAIN (link))
4566 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4569 else if (TREE_CODE (declarator) == INDIRECT_REF)
4571 /* Merge any constancy or volatility into the target type
4574 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4576 pedwarn ("ISO C forbids qualified function types");
4578 type = c_build_qualified_type (type, type_quals);
4579 type_quals = TYPE_UNQUALIFIED;
4582 type = build_pointer_type (type);
4584 /* Process a list of type modifier keywords
4585 (such as const or volatile) that were given inside the `*'. */
4587 if (TREE_TYPE (declarator))
4595 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4596 typemodlist = TREE_CHAIN (typemodlist))
4598 tree qualifier = TREE_VALUE (typemodlist);
4600 if (C_IS_RESERVED_WORD (qualifier))
4602 if (C_RID_CODE (qualifier) == RID_CONST)
4604 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4606 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4616 error ("invalid type modifier within pointer declarator");
4617 if (constp > 1 && ! flag_isoc99)
4618 pedwarn ("duplicate `const'");
4619 if (volatilep > 1 && ! flag_isoc99)
4620 pedwarn ("duplicate `volatile'");
4621 if (restrictp > 1 && ! flag_isoc99)
4622 pedwarn ("duplicate `restrict'");
4624 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4625 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4626 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4629 declarator = TREE_OPERAND (declarator, 0);
4636 /* Now TYPE has the actual type. */
4638 /* Did array size calculations overflow? */
4640 if (TREE_CODE (type) == ARRAY_TYPE
4641 && COMPLETE_TYPE_P (type)
4642 && TREE_OVERFLOW (TYPE_SIZE (type)))
4644 error ("size of array `%s' is too large", name);
4645 /* If we proceed with the array type as it is, we'll eventually
4646 crash in tree_low_cst(). */
4647 type = error_mark_node;
4650 /* If this is declaring a typedef name, return a TYPE_DECL. */
4652 if (specbits & (1 << (int) RID_TYPEDEF))
4655 /* Note that the grammar rejects storage classes
4656 in typenames, fields or parameters */
4657 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4659 pedwarn ("ISO C forbids qualified function types");
4661 type = c_build_qualified_type (type, type_quals);
4662 decl = build_decl (TYPE_DECL, declarator, type);
4663 if ((specbits & (1 << (int) RID_SIGNED))
4664 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4665 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4666 decl_attributes (&decl, returned_attrs, 0);
4670 /* Detect the case of an array type of unspecified size
4671 which came, as such, direct from a typedef name.
4672 We must copy the type, so that each identifier gets
4673 a distinct type, so that each identifier's size can be
4674 controlled separately by its own initializer. */
4676 if (type != 0 && typedef_type != 0
4677 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4678 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4680 type = build_array_type (TREE_TYPE (type), 0);
4682 C_TYPE_VARIABLE_SIZE (type) = 1;
4685 /* If this is a type name (such as, in a cast or sizeof),
4686 compute the type and return it now. */
4688 if (decl_context == TYPENAME)
4690 /* Note that the grammar rejects storage classes
4691 in typenames, fields or parameters */
4692 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4694 pedwarn ("ISO C forbids const or volatile function types");
4696 type = c_build_qualified_type (type, type_quals);
4697 decl_attributes (&type, returned_attrs, 0);
4701 /* Aside from typedefs and type names (handle above),
4702 `void' at top level (not within pointer)
4703 is allowed only in public variables.
4704 We don't complain about parms either, but that is because
4705 a better error message can be made later. */
4707 if (VOID_TYPE_P (type) && decl_context != PARM
4708 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4709 && ((specbits & (1 << (int) RID_EXTERN))
4710 || (current_binding_level == global_binding_level
4712 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4714 error ("variable or field `%s' declared void", name);
4715 type = integer_type_node;
4718 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4719 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4724 if (decl_context == PARM)
4726 tree type_as_written;
4729 /* A parameter declared as an array of T is really a pointer to T.
4730 One declared as a function is really a pointer to a function. */
4732 if (TREE_CODE (type) == ARRAY_TYPE)
4734 /* Transfer const-ness of array into that of type pointed to. */
4735 type = TREE_TYPE (type);
4737 type = c_build_qualified_type (type, type_quals);
4738 type = build_pointer_type (type);
4739 type_quals = TYPE_UNQUALIFIED;
4740 if (array_ptr_quals)
4742 tree new_ptr_quals, new_ptr_attrs;
4744 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4745 /* We don't yet implement attributes in this context. */
4746 if (new_ptr_attrs != NULL_TREE)
4747 warning ("attributes in parameter array declarator ignored");
4752 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4754 tree qualifier = TREE_VALUE (new_ptr_quals);
4756 if (C_IS_RESERVED_WORD (qualifier))
4758 if (C_RID_CODE (qualifier) == RID_CONST)
4760 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4762 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4772 error ("invalid type modifier within array declarator");
4774 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4775 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4776 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4780 else if (TREE_CODE (type) == FUNCTION_TYPE)
4782 if (pedantic && type_quals)
4783 pedwarn ("ISO C forbids qualified function types");
4785 type = c_build_qualified_type (type, type_quals);
4786 type = build_pointer_type (type);
4787 type_quals = TYPE_UNQUALIFIED;
4789 else if (type_quals)
4790 type = c_build_qualified_type (type, type_quals);
4792 type_as_written = type;
4794 decl = build_decl (PARM_DECL, declarator, type);
4796 C_DECL_VARIABLE_SIZE (decl) = 1;
4798 /* Compute the type actually passed in the parmlist,
4799 for the case where there is no prototype.
4800 (For example, shorts and chars are passed as ints.)
4801 When there is a prototype, this is overridden later. */
4803 if (type == error_mark_node)
4804 promoted_type = type;
4806 promoted_type = c_type_promotes_to (type);
4808 DECL_ARG_TYPE (decl) = promoted_type;
4809 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4811 else if (decl_context == FIELD)
4813 /* Structure field. It may not be a function. */
4815 if (TREE_CODE (type) == FUNCTION_TYPE)
4817 error ("field `%s' declared as a function", name);
4818 type = build_pointer_type (type);
4820 else if (TREE_CODE (type) != ERROR_MARK
4821 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4823 error ("field `%s' has incomplete type", name);
4824 type = error_mark_node;
4826 /* Move type qualifiers down to element of an array. */
4827 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4829 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4831 TYPE_DOMAIN (type));
4833 /* Leave the field const or volatile as well. */
4834 type_quals = TYPE_UNQUALIFIED;
4837 decl = build_decl (FIELD_DECL, declarator, type);
4838 DECL_NONADDRESSABLE_P (decl) = bitfield;
4841 C_DECL_VARIABLE_SIZE (decl) = 1;
4843 else if (TREE_CODE (type) == FUNCTION_TYPE)
4845 /* Every function declaration is "external"
4846 except for those which are inside a function body
4847 in which `auto' is used.
4848 That is a case not specified by ANSI C,
4849 and we use it for forward declarations for nested functions. */
4850 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4851 || current_binding_level == global_binding_level);
4853 if (specbits & (1 << (int) RID_AUTO)
4854 && (pedantic || current_binding_level == global_binding_level))
4855 pedwarn ("invalid storage class for function `%s'", name);
4856 if (specbits & (1 << (int) RID_REGISTER))
4857 error ("invalid storage class for function `%s'", name);
4858 if (specbits & (1 << (int) RID_THREAD))
4859 error ("invalid storage class for function `%s'", name);
4860 /* Function declaration not at top level.
4861 Storage classes other than `extern' are not allowed
4862 and `extern' makes no difference. */
4863 if (current_binding_level != global_binding_level
4864 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4866 pedwarn ("invalid storage class for function `%s'", name);
4868 decl = build_decl (FUNCTION_DECL, declarator, type);
4869 decl = build_decl_attribute_variant (decl, decl_attr);
4871 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4872 ggc_alloc_cleared (sizeof (struct lang_decl));
4874 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4875 pedwarn ("ISO C forbids qualified function types");
4877 /* GNU C interprets a `volatile void' return type to indicate
4878 that the function does not return. */
4879 if ((type_quals & TYPE_QUAL_VOLATILE)
4880 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4881 warning ("`noreturn' function returns non-void value");
4884 DECL_EXTERNAL (decl) = 1;
4885 /* Record absence of global scope for `static' or `auto'. */
4887 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4890 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4892 /* Record presence of `inline', if it is reasonable. */
4893 if (MAIN_NAME_P (declarator))
4896 warning ("cannot inline function `main'");
4900 /* Assume that otherwise the function can be inlined. */
4901 DECL_DECLARED_INLINE_P (decl) = 1;
4903 /* Do not mark bare declarations as DECL_INLINE. Doing so
4904 in the presence of multiple declarations can result in
4905 the abstract origin pointing between the declarations,
4906 which will confuse dwarf2out. */
4909 DECL_INLINE (decl) = 1;
4910 if (specbits & (1 << (int) RID_EXTERN))
4911 current_extern_inline = 1;
4914 /* If -finline-functions, assume it can be inlined. This does
4915 two things: let the function be deferred until it is actually
4916 needed, and let dwarf2 know that the function is inlinable. */
4917 else if (flag_inline_trees == 2 && initialized)
4919 DECL_INLINE (decl) = 1;
4920 DECL_DECLARED_INLINE_P (decl) = 0;
4925 /* It's a variable. */
4926 /* An uninitialized decl with `extern' is a reference. */
4927 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4929 /* Move type qualifiers down to element of an array. */
4930 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4932 int saved_align = TYPE_ALIGN(type);
4933 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4935 TYPE_DOMAIN (type));
4936 TYPE_ALIGN (type) = saved_align;
4937 #if 0 /* Leave the variable const or volatile as well. */
4938 type_quals = TYPE_UNQUALIFIED;
4941 else if (type_quals)
4942 type = c_build_qualified_type (type, type_quals);
4944 decl = build_decl (VAR_DECL, declarator, type);
4946 C_DECL_VARIABLE_SIZE (decl) = 1;
4949 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4951 DECL_EXTERNAL (decl) = extern_ref;
4953 /* At top level, the presence of a `static' or `register' storage
4954 class specifier, or the absence of all storage class specifiers
4955 makes this declaration a definition (perhaps tentative). Also,
4956 the absence of both `static' and `register' makes it public. */
4957 if (current_binding_level == global_binding_level)
4959 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4960 | (1 << (int) RID_REGISTER)));
4961 TREE_STATIC (decl) = !extern_ref;
4963 /* Not at top level, only `static' makes a static definition. */
4966 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4967 TREE_PUBLIC (decl) = extern_ref;
4970 if (specbits & 1 << (int) RID_THREAD)
4972 if (targetm.have_tls)
4973 DECL_THREAD_LOCAL (decl) = 1;
4975 /* A mere warning is sure to result in improper semantics
4976 at runtime. Don't bother to allow this to compile. */
4977 error ("thread-local storage not supported for this target");
4981 /* Record `register' declaration for warnings on &
4982 and in case doing stupid register allocation. */
4984 if (specbits & (1 << (int) RID_REGISTER))
4985 DECL_REGISTER (decl) = 1;
4987 /* Record constancy and volatility. */
4988 c_apply_type_quals_to_decl (type_quals, decl);
4990 /* If a type has volatile components, it should be stored in memory.
4991 Otherwise, the fact that those components are volatile
4992 will be ignored, and would even crash the compiler. */
4993 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4994 c_mark_addressable (decl);
4996 decl_attributes (&decl, returned_attrs, 0);
5002 /* Decode the parameter-list info for a function type or function definition.
5003 The argument is the value returned by `get_parm_info' (or made in parse.y
5004 if there is an identifier list instead of a parameter decl list).
5005 These two functions are separate because when a function returns
5006 or receives functions then each is called multiple times but the order
5007 of calls is different. The last call to `grokparms' is always the one
5008 that contains the formal parameter names of a function definition.
5010 Store in `last_function_parms' a chain of the decls of parms.
5011 Also store in `last_function_parm_tags' a chain of the struct, union,
5012 and enum tags declared among the parms.
5014 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5016 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5017 a mere declaration. A nonempty identifier-list gets an error message
5018 when FUNCDEF_FLAG is zero. */
5021 grokparms (parms_info, funcdef_flag)
5025 tree first_parm = TREE_CHAIN (parms_info);
5027 last_function_parms = TREE_PURPOSE (parms_info);
5028 last_function_parm_tags = TREE_VALUE (parms_info);
5030 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5031 && !in_system_header)
5032 warning ("function declaration isn't a prototype");
5035 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5038 pedwarn ("parameter names (without types) in function declaration");
5040 last_function_parms = first_parm;
5047 /* We no longer test FUNCDEF_FLAG.
5048 If the arg types are incomplete in a declaration,
5049 they must include undefined tags.
5050 These tags can never be defined in the scope of the declaration,
5051 so the types can never be completed,
5052 and no call can be compiled successfully. */
5054 /* In a fcn definition, arg types must be complete. */
5057 for (parm = last_function_parms, typelt = first_parm;
5059 parm = TREE_CHAIN (parm))
5060 /* Skip over any enumeration constants declared here. */
5061 if (TREE_CODE (parm) == PARM_DECL)
5063 /* Barf if the parameter itself has an incomplete type. */
5064 tree type = TREE_VALUE (typelt);
5065 if (type == error_mark_node)
5067 if (!COMPLETE_TYPE_P (type))
5069 if (funcdef_flag && DECL_NAME (parm) != 0)
5070 error ("parameter `%s' has incomplete type",
5071 IDENTIFIER_POINTER (DECL_NAME (parm)));
5073 warning ("parameter has incomplete type");
5076 TREE_VALUE (typelt) = error_mark_node;
5077 TREE_TYPE (parm) = error_mark_node;
5081 /* This has been replaced by parm_tags_warning, which
5082 uses a more accurate criterion for what to warn
5086 /* Now warn if is a pointer to an incomplete type. */
5087 while (TREE_CODE (type) == POINTER_TYPE
5088 || TREE_CODE (type) == REFERENCE_TYPE)
5089 type = TREE_TYPE (type);
5090 type = TYPE_MAIN_VARIANT (type);
5091 if (!COMPLETE_TYPE_P (type))
5093 if (DECL_NAME (parm) != 0)
5094 warning ("parameter `%s' points to incomplete type",
5095 IDENTIFIER_POINTER (DECL_NAME (parm)));
5097 warning ("parameter points to incomplete type");
5101 typelt = TREE_CHAIN (typelt);
5108 /* Return a tree_list node with info on a parameter list just parsed.
5109 The TREE_PURPOSE is a chain of decls of those parms.
5110 The TREE_VALUE is a list of structure, union and enum tags defined.
5111 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5112 This tree_list node is later fed to `grokparms'.
5114 VOID_AT_END nonzero means append `void' to the end of the type-list.
5115 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5118 get_parm_info (void_at_end)
5124 tree tags = gettags ();
5125 tree parms = getdecls ();
5127 tree order = current_binding_level->parm_order;
5129 /* Just `void' (and no ellipsis) is special. There are really no parms.
5130 But if the `void' is qualified (by `const' or `volatile') or has a
5131 storage class specifier (`register'), then the behavior is undefined;
5132 by not counting it as the special case of `void' we will cause an
5133 error later. Typedefs for `void' are OK (see DR#157). */
5134 if (void_at_end && parms != 0
5135 && TREE_CHAIN (parms) == 0
5136 && VOID_TYPE_P (TREE_TYPE (parms))
5137 && ! TREE_THIS_VOLATILE (parms)
5138 && ! TREE_READONLY (parms)
5139 && ! DECL_REGISTER (parms)
5140 && DECL_NAME (parms) == 0)
5143 storedecls (NULL_TREE);
5144 return tree_cons (NULL_TREE, NULL_TREE,
5145 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5148 /* Extract enumerator values and other non-parms declared with the parms.
5149 Likewise any forward parm decls that didn't have real parm decls. */
5150 for (decl = parms; decl;)
5152 tree next = TREE_CHAIN (decl);
5154 if (TREE_CODE (decl) != PARM_DECL)
5156 TREE_CHAIN (decl) = new_parms;
5159 else if (TREE_ASM_WRITTEN (decl))
5161 error_with_decl (decl,
5162 "parameter `%s' has just a forward declaration");
5163 TREE_CHAIN (decl) = new_parms;
5169 /* Put the parm decls back in the order they were in in the parm list. */
5170 for (t = order; t; t = TREE_CHAIN (t))
5173 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5175 TREE_CHAIN (TREE_VALUE (t)) = 0;
5178 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5181 /* Store the parmlist in the binding level since the old one
5182 is no longer a valid list. (We have changed the chain pointers.) */
5183 storedecls (new_parms);
5185 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5186 /* There may also be declarations for enumerators if an enumeration
5187 type is declared among the parms. Ignore them here. */
5188 if (TREE_CODE (decl) == PARM_DECL)
5190 /* Since there is a prototype,
5191 args are passed in their declared types. */
5192 tree type = TREE_TYPE (decl);
5193 DECL_ARG_TYPE (decl) = type;
5194 if (PROMOTE_PROTOTYPES
5195 && INTEGRAL_TYPE_P (type)
5196 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5197 DECL_ARG_TYPE (decl) = integer_type_node;
5199 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5200 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5201 && DECL_NAME (decl) == 0)
5203 error ("`void' in parameter list must be the entire list");
5209 return tree_cons (new_parms, tags,
5210 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5212 return tree_cons (new_parms, tags, nreverse (types));
5215 /* At end of parameter list, warn about any struct, union or enum tags
5216 defined within. Do so because these types cannot ever become complete. */
5219 parmlist_tags_warning ()
5224 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5226 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5227 /* An anonymous union parm type is meaningful as a GNU extension.
5228 So don't warn for that. */
5229 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5231 if (TREE_PURPOSE (elt) != 0)
5233 if (code == RECORD_TYPE)
5234 warning ("`struct %s' declared inside parameter list",
5235 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5236 else if (code == UNION_TYPE)
5237 warning ("`union %s' declared inside parameter list",
5238 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5240 warning ("`enum %s' declared inside parameter list",
5241 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5245 /* For translation these need to be separate warnings */
5246 if (code == RECORD_TYPE)
5247 warning ("anonymous struct declared inside parameter list");
5248 else if (code == UNION_TYPE)
5249 warning ("anonymous union declared inside parameter list");
5251 warning ("anonymous enum declared inside parameter list");
5255 warning ("its scope is only this definition or declaration, which is probably not what you want");
5261 /* Get the struct, enum or union (CODE says which) with tag NAME.
5262 Define the tag as a forward-reference if it is not defined. */
5265 xref_tag (code, name)
5266 enum tree_code code;
5269 /* If a cross reference is requested, look up the type
5270 already defined for this tag and return it. */
5272 tree ref = lookup_tag (code, name, current_binding_level, 0);
5273 /* If this is the right type of tag, return what we found.
5274 (This reference will be shadowed by shadow_tag later if appropriate.)
5275 If this is the wrong type of tag, do not return it. If it was the
5276 wrong type in the same binding level, we will have had an error
5277 message already; if in a different binding level and declaring
5278 a name, pending_xref_error will give an error message; but if in a
5279 different binding level and not declaring a name, this tag should
5280 shadow the previous declaration of a different type of tag, and
5281 this would not work properly if we return the reference found.
5282 (For example, with "struct foo" in an outer scope, "union foo;"
5283 must shadow that tag with a new one of union type.) */
5284 if (ref && TREE_CODE (ref) == code)
5287 /* If no such tag is yet defined, create a forward-reference node
5288 and record it as the "definition".
5289 When a real declaration of this type is found,
5290 the forward-reference will be altered into a real type. */
5292 ref = make_node (code);
5293 if (code == ENUMERAL_TYPE)
5295 /* Give the type a default layout like unsigned int
5296 to avoid crashing if it does not get defined. */
5297 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5298 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5299 TYPE_USER_ALIGN (ref) = 0;
5300 TREE_UNSIGNED (ref) = 1;
5301 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5302 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5303 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5306 pushtag (name, ref);
5311 /* Make sure that the tag NAME is defined *in the current binding level*
5312 at least as a forward reference.
5313 CODE says which kind of tag NAME ought to be. */
5316 start_struct (code, name)
5317 enum tree_code code;
5320 /* If there is already a tag defined at this binding level
5321 (as a forward reference), just return it. */
5326 ref = lookup_tag (code, name, current_binding_level, 1);
5327 if (ref && TREE_CODE (ref) == code)
5329 C_TYPE_BEING_DEFINED (ref) = 1;
5330 TYPE_PACKED (ref) = flag_pack_struct;
5331 if (TYPE_FIELDS (ref))
5333 if (code == UNION_TYPE)
5334 error ("redefinition of `union %s'",
5335 IDENTIFIER_POINTER (name));
5337 error ("redefinition of `struct %s'",
5338 IDENTIFIER_POINTER (name));
5344 /* Otherwise create a forward-reference just so the tag is in scope. */
5346 ref = make_node (code);
5347 pushtag (name, ref);
5348 C_TYPE_BEING_DEFINED (ref) = 1;
5349 TYPE_PACKED (ref) = flag_pack_struct;
5353 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5354 of a structure component, returning a FIELD_DECL node.
5355 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5357 This is done during the parsing of the struct declaration.
5358 The FIELD_DECL nodes are chained together and the lot of them
5359 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5362 grokfield (filename, line, declarator, declspecs, width)
5363 const char *filename ATTRIBUTE_UNUSED;
5364 int line ATTRIBUTE_UNUSED;
5365 tree declarator, declspecs, width;
5369 if (declarator == NULL_TREE && width == NULL_TREE)
5371 /* This is an unnamed decl.
5373 If we have something of the form "union { list } ;" then this
5374 is the anonymous union extension. Similarly for struct.
5376 If this is something of the form "struct foo;", then
5377 If MS extensions are enabled, this is handled as an
5379 Otherwise this is a forward declaration of a structure tag.
5381 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5382 If MS extensions are enabled and foo names a structure, then
5383 again this is an anonymous struct.
5384 Otherwise this is an error.
5386 Oh what a horrid tangled web we weave. I wonder if MS consiously
5387 took this from Plan 9 or if it was an accident of implementation
5388 that took root before someone noticed the bug... */
5390 tree type = TREE_VALUE (declspecs);
5392 if (flag_ms_extensions && TREE_CODE (type) == TYPE_DECL)
5393 type = TREE_TYPE (type);
5394 if (TREE_CODE (type) == RECORD_TYPE || TREE_CODE (type) == UNION_TYPE)
5396 if (flag_ms_extensions)
5399 goto warn_unnamed_field;
5400 else if (TYPE_NAME (type) == NULL)
5403 goto warn_unnamed_field;
5408 warning ("declaration does not declare anything");
5413 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5415 finish_decl (value, NULL_TREE, NULL_TREE);
5416 DECL_INITIAL (value) = width;
5418 maybe_objc_check_decl (value);
5422 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5423 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5424 ATTRIBUTES are attributes to be applied to the structure. */
5427 finish_struct (t, fieldlist, attributes)
5433 int toplevel = global_binding_level == current_binding_level;
5434 int saw_named_field;
5436 /* If this type was previously laid out as a forward reference,
5437 make sure we lay it out again. */
5441 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5443 /* Nameless union parm types are useful as GCC extension. */
5444 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5445 /* Otherwise, warn about any struct or union def. in parmlist. */
5446 if (in_parm_level_p ())
5449 pedwarn ("%s defined inside parms",
5450 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5452 warning ("%s defined inside parms",
5453 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5458 for (x = fieldlist; x; x = TREE_CHAIN (x))
5459 if (DECL_NAME (x) != 0)
5463 pedwarn ("%s has no %s",
5464 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5465 fieldlist ? _("named members") : _("members"));
5468 /* Install struct as DECL_CONTEXT of each field decl.
5469 Also process specified field sizes,m which is found in the DECL_INITIAL.
5470 Store 0 there, except for ": 0" fields (so we can find them
5471 and delete them, below). */
5473 saw_named_field = 0;
5474 for (x = fieldlist; x; x = TREE_CHAIN (x))
5476 DECL_CONTEXT (x) = t;
5477 DECL_PACKED (x) |= TYPE_PACKED (t);
5479 /* If any field is const, the structure type is pseudo-const. */
5480 if (TREE_READONLY (x))
5481 C_TYPE_FIELDS_READONLY (t) = 1;
5484 /* A field that is pseudo-const makes the structure likewise. */
5485 tree t1 = TREE_TYPE (x);
5486 while (TREE_CODE (t1) == ARRAY_TYPE)
5487 t1 = TREE_TYPE (t1);
5488 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5489 && C_TYPE_FIELDS_READONLY (t1))
5490 C_TYPE_FIELDS_READONLY (t) = 1;
5493 /* Any field that is volatile means variables of this type must be
5494 treated in some ways as volatile. */
5495 if (TREE_THIS_VOLATILE (x))
5496 C_TYPE_FIELDS_VOLATILE (t) = 1;
5498 /* Any field of nominal variable size implies structure is too. */
5499 if (C_DECL_VARIABLE_SIZE (x))
5500 C_TYPE_VARIABLE_SIZE (t) = 1;
5502 /* Detect invalid nested redefinition. */
5503 if (TREE_TYPE (x) == t)
5504 error ("nested redefinition of `%s'",
5505 IDENTIFIER_POINTER (TYPE_NAME (t)));
5507 /* Detect invalid bit-field size. */
5508 if (DECL_INITIAL (x))
5509 STRIP_NOPS (DECL_INITIAL (x));
5510 if (DECL_INITIAL (x))
5512 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5513 constant_expression_warning (DECL_INITIAL (x));
5517 "bit-field `%s' width not an integer constant");
5518 DECL_INITIAL (x) = NULL;
5522 /* Detect invalid bit-field type. */
5523 if (DECL_INITIAL (x)
5524 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5525 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5526 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5528 error_with_decl (x, "bit-field `%s' has invalid type");
5529 DECL_INITIAL (x) = NULL;
5532 if (DECL_INITIAL (x) && pedantic
5533 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5534 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5535 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5536 /* Accept an enum that's equivalent to int or unsigned int. */
5537 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5538 && (TYPE_PRECISION (TREE_TYPE (x))
5539 == TYPE_PRECISION (integer_type_node))))
5540 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5542 /* Detect and ignore out of range field width and process valid
5544 if (DECL_INITIAL (x))
5547 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5548 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5550 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5551 error_with_decl (x, "negative width in bit-field `%s'");
5552 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5553 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5554 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5555 error_with_decl (x, "zero width for bit-field `%s'");
5558 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5559 unsigned HOST_WIDE_INT width
5560 = tree_low_cst (DECL_INITIAL (x), 1);
5562 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5563 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5564 TREE_UNSIGNED (TREE_TYPE (x)))
5566 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5567 TREE_UNSIGNED (TREE_TYPE (x))))))
5568 warning_with_decl (x,
5569 "`%s' is narrower than values of its type");
5571 DECL_SIZE (x) = bitsize_int (width);
5572 DECL_BIT_FIELD (x) = 1;
5573 SET_DECL_C_BIT_FIELD (x);
5576 && ! (* targetm.ms_bitfield_layout_p) (t))
5578 /* field size 0 => force desired amount of alignment. */
5579 #ifdef EMPTY_FIELD_BOUNDARY
5580 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5582 #ifdef PCC_BITFIELD_TYPE_MATTERS
5583 if (PCC_BITFIELD_TYPE_MATTERS)
5585 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5586 TYPE_ALIGN (TREE_TYPE (x)));
5587 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5594 else if (TREE_TYPE (x) != error_mark_node)
5596 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5597 : TYPE_ALIGN (TREE_TYPE (x)));
5599 /* Non-bit-fields are aligned for their type, except packed
5600 fields which require only BITS_PER_UNIT alignment. */
5601 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5602 if (! DECL_PACKED (x))
5603 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5606 DECL_INITIAL (x) = 0;
5608 /* Detect flexible array member in an invalid context. */
5609 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5610 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5611 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5612 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5614 if (TREE_CODE (t) == UNION_TYPE)
5615 error_with_decl (x, "flexible array member in union");
5616 else if (TREE_CHAIN (x) != NULL_TREE)
5617 error_with_decl (x, "flexible array member not at end of struct");
5618 else if (! saw_named_field)
5619 error_with_decl (x, "flexible array member in otherwise empty struct");
5622 saw_named_field = 1;
5625 /* Delete all duplicate fields from the fieldlist */
5626 for (x = fieldlist; x && TREE_CHAIN (x);)
5627 /* Anonymous fields aren't duplicates. */
5628 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5636 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5642 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5644 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5645 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5651 /* Now we have the nearly final fieldlist. Record it,
5652 then lay out the structure or union (including the fields). */
5654 TYPE_FIELDS (t) = fieldlist;
5658 /* Delete all zero-width bit-fields from the fieldlist */
5660 tree *fieldlistp = &fieldlist;
5662 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5663 *fieldlistp = TREE_CHAIN (*fieldlistp);
5665 fieldlistp = &TREE_CHAIN (*fieldlistp);
5668 /* Now we have the truly final field list.
5669 Store it in this type and in the variants. */
5671 TYPE_FIELDS (t) = fieldlist;
5673 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5675 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5676 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5677 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5678 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5681 /* If this was supposed to be a transparent union, but we can't
5682 make it one, warn and turn off the flag. */
5683 if (TREE_CODE (t) == UNION_TYPE
5684 && TYPE_TRANSPARENT_UNION (t)
5685 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5687 TYPE_TRANSPARENT_UNION (t) = 0;
5688 warning ("union cannot be made transparent");
5691 /* If this structure or union completes the type of any previous
5692 variable declaration, lay it out and output its rtl. */
5694 if (current_binding_level->incomplete_list != NULL_TREE)
5696 tree prev = NULL_TREE;
5698 for (x = current_binding_level->incomplete_list; x; x = TREE_CHAIN (x))
5700 tree decl = TREE_VALUE (x);
5702 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5703 && TREE_CODE (decl) != TYPE_DECL)
5705 layout_decl (decl, 0);
5706 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5707 maybe_objc_check_decl (decl);
5708 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5711 /* Unlink X from the incomplete list. */
5713 TREE_CHAIN (prev) = TREE_CHAIN (x);
5715 current_binding_level->incomplete_list = TREE_CHAIN (x);
5717 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5718 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5720 tree element = TREE_TYPE (decl);
5721 while (TREE_CODE (element) == ARRAY_TYPE)
5722 element = TREE_TYPE (element);
5725 layout_array_type (TREE_TYPE (decl));
5726 if (TREE_CODE (decl) != TYPE_DECL)
5728 layout_decl (decl, 0);
5729 maybe_objc_check_decl (decl);
5730 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5734 /* Unlink X from the incomplete list. */
5736 TREE_CHAIN (prev) = TREE_CHAIN (x);
5738 current_binding_level->incomplete_list = TREE_CHAIN (x);
5744 /* Finish debugging output for this type. */
5745 rest_of_type_compilation (t, toplevel);
5750 /* Lay out the type T, and its element type, and so on. */
5753 layout_array_type (t)
5756 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5757 layout_array_type (TREE_TYPE (t));
5761 /* Begin compiling the definition of an enumeration type.
5762 NAME is its name (or null if anonymous).
5763 Returns the type object, as yet incomplete.
5764 Also records info about it so that build_enumerator
5765 may be used to declare the individual values as they are read. */
5773 /* If this is the real definition for a previous forward reference,
5774 fill in the contents in the same object that used to be the
5775 forward reference. */
5778 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5780 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5782 enumtype = make_node (ENUMERAL_TYPE);
5783 pushtag (name, enumtype);
5786 C_TYPE_BEING_DEFINED (enumtype) = 1;
5788 if (TYPE_VALUES (enumtype) != 0)
5790 /* This enum is a named one that has been declared already. */
5791 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5793 /* Completely replace its old definition.
5794 The old enumerators remain defined, however. */
5795 TYPE_VALUES (enumtype) = 0;
5798 enum_next_value = integer_zero_node;
5801 if (flag_short_enums)
5802 TYPE_PACKED (enumtype) = 1;
5807 /* After processing and defining all the values of an enumeration type,
5808 install their decls in the enumeration type and finish it off.
5809 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5810 and ATTRIBUTES are the specified attributes.
5811 Returns ENUMTYPE. */
5814 finish_enum (enumtype, values, attributes)
5820 tree minnode = 0, maxnode = 0, enum_value_type;
5821 int precision, unsign;
5822 int toplevel = (global_binding_level == current_binding_level);
5824 if (in_parm_level_p ())
5825 warning ("enum defined inside parms");
5827 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5829 /* Calculate the maximum value of any enumerator in this type. */
5831 if (values == error_mark_node)
5832 minnode = maxnode = integer_zero_node;
5835 minnode = maxnode = TREE_VALUE (values);
5836 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5838 tree value = TREE_VALUE (pair);
5839 if (tree_int_cst_lt (maxnode, value))
5841 if (tree_int_cst_lt (value, minnode))
5846 /* Construct the final type of this enumeration. It is the same
5847 as one of the integral types - the narrowest one that fits, except
5848 that normally we only go as narrow as int - and signed iff any of
5849 the values are negative. */
5850 unsign = (tree_int_cst_sgn (minnode) >= 0);
5851 precision = MAX (min_precision (minnode, unsign),
5852 min_precision (maxnode, unsign));
5853 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5855 tree narrowest = c_common_type_for_size (precision, unsign);
5858 warning ("enumeration values exceed range of largest integer");
5859 narrowest = long_long_integer_type_node;
5862 precision = TYPE_PRECISION (narrowest);
5865 precision = TYPE_PRECISION (integer_type_node);
5867 if (precision == TYPE_PRECISION (integer_type_node))
5868 enum_value_type = c_common_type_for_size (precision, 0);
5870 enum_value_type = enumtype;
5872 TYPE_MIN_VALUE (enumtype) = minnode;
5873 TYPE_MAX_VALUE (enumtype) = maxnode;
5874 TYPE_PRECISION (enumtype) = precision;
5875 TREE_UNSIGNED (enumtype) = unsign;
5876 TYPE_SIZE (enumtype) = 0;
5877 layout_type (enumtype);
5879 if (values != error_mark_node)
5881 /* Change the type of the enumerators to be the enum type. We
5882 need to do this irrespective of the size of the enum, for
5883 proper type checking. Replace the DECL_INITIALs of the
5884 enumerators, and the value slots of the list, with copies
5885 that have the enum type; they cannot be modified in place
5886 because they may be shared (e.g. integer_zero_node) Finally,
5887 change the purpose slots to point to the names of the decls. */
5888 for (pair = values; pair; pair = TREE_CHAIN (pair))
5890 tree enu = TREE_PURPOSE (pair);
5892 TREE_TYPE (enu) = enumtype;
5893 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5894 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5895 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5896 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5897 DECL_MODE (enu) = TYPE_MODE (enumtype);
5899 /* The ISO C Standard mandates enumerators to have type int,
5900 even though the underlying type of an enum type is
5901 unspecified. Here we convert any enumerators that fit in
5902 an int to type int, to avoid promotions to unsigned types
5903 when comparing integers with enumerators that fit in the
5904 int range. When -pedantic is given, build_enumerator()
5905 would have already taken care of those that don't fit. */
5906 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5907 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5909 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5911 TREE_PURPOSE (pair) = DECL_NAME (enu);
5912 TREE_VALUE (pair) = DECL_INITIAL (enu);
5915 TYPE_VALUES (enumtype) = values;
5918 /* Fix up all variant types of this enum type. */
5919 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5921 if (tem == enumtype)
5923 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5924 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5925 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5926 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5927 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5928 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5929 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5930 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5931 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5932 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5935 /* Finish debugging output for this type. */
5936 rest_of_type_compilation (enumtype, toplevel);
5941 /* Build and install a CONST_DECL for one value of the
5942 current enumeration type (one that was begun with start_enum).
5943 Return a tree-list containing the CONST_DECL and its value.
5944 Assignment of sequential values by default is handled here. */
5947 build_enumerator (name, value)
5952 /* Validate and default VALUE. */
5954 /* Remove no-op casts from the value. */
5956 STRIP_TYPE_NOPS (value);
5960 if (TREE_CODE (value) == INTEGER_CST)
5962 value = default_conversion (value);
5963 constant_expression_warning (value);
5967 error ("enumerator value for `%s' not integer constant",
5968 IDENTIFIER_POINTER (name));
5973 /* Default based on previous value. */
5974 /* It should no longer be possible to have NON_LVALUE_EXPR
5978 value = enum_next_value;
5980 error ("overflow in enumeration values");
5983 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5985 pedwarn ("ISO C restricts enumerator values to range of `int'");
5986 value = convert (integer_type_node, value);
5989 /* Set basis for default for next value. */
5990 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5991 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5993 /* Now create a declaration for the enum value name. */
5995 type = TREE_TYPE (value);
5996 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5997 TYPE_PRECISION (integer_type_node)),
5998 (TYPE_PRECISION (type)
5999 >= TYPE_PRECISION (integer_type_node)
6000 && TREE_UNSIGNED (type)));
6002 decl = build_decl (CONST_DECL, name, type);
6003 DECL_INITIAL (decl) = convert (type, value);
6006 return tree_cons (decl, value, NULL_TREE);
6010 /* Create the FUNCTION_DECL for a function definition.
6011 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6012 the declaration; they describe the function's name and the type it returns,
6013 but twisted together in a fashion that parallels the syntax of C.
6015 This function creates a binding context for the function body
6016 as well as setting up the FUNCTION_DECL in current_function_decl.
6018 Returns 1 on success. If the DECLARATOR is not suitable for a function
6019 (it defines a datum instead), we return 0, which tells
6020 yyparse to report a parse error. */
6023 start_function (declspecs, declarator, attributes)
6024 tree declarator, declspecs, attributes;
6026 tree decl1, old_decl;
6028 int old_immediate_size_expand = immediate_size_expand;
6030 current_function_returns_value = 0; /* Assume, until we see it does. */
6031 current_function_returns_null = 0;
6032 current_function_returns_abnormally = 0;
6033 warn_about_return_type = 0;
6034 current_extern_inline = 0;
6035 c_function_varargs = 0;
6037 shadowed_labels = 0;
6039 /* Don't expand any sizes in the return type of the function. */
6040 immediate_size_expand = 0;
6042 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6044 /* If the declarator is not suitable for a function definition,
6045 cause a syntax error. */
6048 immediate_size_expand = old_immediate_size_expand;
6052 decl_attributes (&decl1, attributes, 0);
6054 /* If #pragma weak was used, mark the decl weak now. */
6055 if (current_binding_level == global_binding_level)
6056 maybe_apply_pragma_weak (decl1);
6058 if (DECL_DECLARED_INLINE_P (decl1)
6059 && DECL_UNINLINABLE (decl1)
6060 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6061 warning_with_decl (decl1,
6062 "inline function `%s' given attribute noinline");
6064 announce_function (decl1);
6066 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6068 error ("return type is an incomplete type");
6069 /* Make it return void instead. */
6071 = build_function_type (void_type_node,
6072 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6075 if (warn_about_return_type)
6076 pedwarn_c99 ("return type defaults to `int'");
6078 /* Save the parm names or decls from this function's declarator
6079 where store_parm_decls will find them. */
6080 current_function_parms = last_function_parms;
6081 current_function_parm_tags = last_function_parm_tags;
6083 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6084 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6085 DECL_INITIAL (decl1) = error_mark_node;
6087 /* If this definition isn't a prototype and we had a prototype declaration
6088 before, copy the arg type info from that prototype.
6089 But not if what we had before was a builtin function. */
6090 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6091 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6092 && !DECL_BUILT_IN (old_decl)
6093 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6094 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6095 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6097 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6098 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6099 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6102 /* If there is no explicit declaration, look for any out-of-scope implicit
6105 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6107 /* Optionally warn of old-fashioned def with no previous prototype. */
6108 if (warn_strict_prototypes
6109 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6111 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6112 || (DECL_BUILT_IN (old_decl)
6113 && ! C_DECL_ANTICIPATED (old_decl)))))
6114 warning ("function declaration isn't a prototype");
6115 /* Optionally warn of any global def with no previous prototype. */
6116 else if (warn_missing_prototypes
6117 && TREE_PUBLIC (decl1)
6119 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6120 || (DECL_BUILT_IN (old_decl)
6121 && ! C_DECL_ANTICIPATED (old_decl))))
6122 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6123 warning_with_decl (decl1, "no previous prototype for `%s'");
6124 /* Optionally warn of any def with no previous prototype
6125 if the function has already been used. */
6126 else if (warn_missing_prototypes
6127 && old_decl != 0 && TREE_USED (old_decl)
6128 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6129 warning_with_decl (decl1,
6130 "`%s' was used with no prototype before its definition");
6131 /* Optionally warn of any global def with no previous declaration. */
6132 else if (warn_missing_declarations
6133 && TREE_PUBLIC (decl1)
6135 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6136 warning_with_decl (decl1, "no previous declaration for `%s'");
6137 /* Optionally warn of any def with no previous declaration
6138 if the function has already been used. */
6139 else if (warn_missing_declarations
6140 && old_decl != 0 && TREE_USED (old_decl)
6141 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6142 warning_with_decl (decl1,
6143 "`%s' was used with no declaration before its definition");
6145 /* This is a definition, not a reference.
6146 So normally clear DECL_EXTERNAL.
6147 However, `extern inline' acts like a declaration
6148 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6149 DECL_EXTERNAL (decl1) = current_extern_inline;
6151 /* This function exists in static storage.
6152 (This does not mean `static' in the C sense!) */
6153 TREE_STATIC (decl1) = 1;
6155 /* A nested function is not global. */
6156 if (current_function_decl != 0)
6157 TREE_PUBLIC (decl1) = 0;
6159 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6160 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6165 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6166 != integer_type_node)
6167 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6169 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6170 args = TREE_CHAIN (args))
6172 tree type = args ? TREE_VALUE (args) : 0;
6174 if (type == void_type_node)
6181 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6182 pedwarn_with_decl (decl1,
6183 "first argument of `%s' should be `int'");
6187 if (TREE_CODE (type) != POINTER_TYPE
6188 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6189 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6191 pedwarn_with_decl (decl1,
6192 "second argument of `%s' should be `char **'");
6196 if (TREE_CODE (type) != POINTER_TYPE
6197 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6198 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6200 pedwarn_with_decl (decl1,
6201 "third argument of `%s' should probably be `char **'");
6206 /* It is intentional that this message does not mention the third
6207 argument because it's only mentioned in an appendix of the
6209 if (argct > 0 && (argct < 2 || argct > 3))
6210 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6212 if (! TREE_PUBLIC (decl1))
6213 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6216 /* Record the decl so that the function name is defined.
6217 If we already have a decl for this name, and it is a FUNCTION_DECL,
6218 use the old decl. */
6220 current_function_decl = pushdecl (decl1);
6223 declare_parm_level (1);
6224 current_binding_level->subblocks_tag_transparent = 1;
6226 make_decl_rtl (current_function_decl, NULL);
6228 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6229 /* Promote the value to int before returning it. */
6230 if (c_promoting_integer_type_p (restype))
6232 /* It retains unsignedness if not really getting wider. */
6233 if (TREE_UNSIGNED (restype)
6234 && (TYPE_PRECISION (restype)
6235 == TYPE_PRECISION (integer_type_node)))
6236 restype = unsigned_type_node;
6238 restype = integer_type_node;
6240 DECL_RESULT (current_function_decl)
6241 = build_decl (RESULT_DECL, NULL_TREE, restype);
6243 /* If this fcn was already referenced via a block-scope `extern' decl
6244 (or an implicit decl), propagate certain information about the usage. */
6245 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6246 TREE_ADDRESSABLE (current_function_decl) = 1;
6248 immediate_size_expand = old_immediate_size_expand;
6250 start_fname_decls ();
6255 /* Record that this function is going to be a varargs function.
6256 This is called before store_parm_decls, which is too early
6257 to call mark_varargs directly. */
6262 c_function_varargs = 1;
6265 /* Store the parameter declarations into the current function declaration.
6266 This is called after parsing the parameter declarations, before
6267 digesting the body of the function.
6269 For an old-style definition, modify the function's type
6270 to specify at least the number of arguments. */
6275 tree fndecl = current_function_decl;
6278 /* This is either a chain of PARM_DECLs (if a prototype was used)
6279 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6280 tree specparms = current_function_parms;
6282 /* This is a list of types declared among parms in a prototype. */
6283 tree parmtags = current_function_parm_tags;
6285 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6286 tree parmdecls = getdecls ();
6288 /* This is a chain of any other decls that came in among the parm
6289 declarations. If a parm is declared with enum {foo, bar} x;
6290 then CONST_DECLs for foo and bar are put here. */
6293 /* The function containing FNDECL, if any. */
6294 tree context = decl_function_context (fndecl);
6296 /* Nonzero if this definition is written with a prototype. */
6299 int saved_warn_shadow = warn_shadow;
6301 /* Don't re-emit shadow warnings. */
6304 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6306 /* This case is when the function was defined with an ANSI prototype.
6307 The parms already have decls, so we need not do anything here
6308 except record them as in effect
6309 and complain if any redundant old-style parm decls were written. */
6320 error_with_decl (fndecl,
6321 "parm types given both in parmlist and separately");
6322 /* Get rid of the erroneous decls; don't keep them on
6323 the list of parms, since they might not be PARM_DECLs. */
6324 for (decl = current_binding_level->names;
6325 decl; decl = TREE_CHAIN (decl))
6326 if (DECL_NAME (decl))
6327 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6328 for (link = current_binding_level->shadowed;
6329 link; link = TREE_CHAIN (link))
6330 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6331 current_binding_level->names = 0;
6332 current_binding_level->shadowed = 0;
6335 specparms = nreverse (specparms);
6336 for (parm = specparms; parm; parm = next)
6338 next = TREE_CHAIN (parm);
6339 if (TREE_CODE (parm) == PARM_DECL)
6341 if (DECL_NAME (parm) == 0)
6342 error_with_decl (parm, "parameter name omitted");
6343 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6344 && VOID_TYPE_P (TREE_TYPE (parm)))
6346 error_with_decl (parm, "parameter `%s' declared void");
6347 /* Change the type to error_mark_node so this parameter
6348 will be ignored by assign_parms. */
6349 TREE_TYPE (parm) = error_mark_node;
6355 /* If we find an enum constant or a type tag,
6356 put it aside for the moment. */
6357 TREE_CHAIN (parm) = 0;
6358 others = chainon (others, parm);
6362 /* Get the decls in their original chain order
6363 and record in the function. */
6364 DECL_ARGUMENTS (fndecl) = getdecls ();
6367 /* If this function takes a variable number of arguments,
6368 add a phony parameter to the end of the parm list,
6369 to represent the position of the first unnamed argument. */
6370 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6373 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6374 /* Let's hope the address of the unnamed parm
6375 won't depend on its type. */
6376 TREE_TYPE (dummy) = integer_type_node;
6377 DECL_ARG_TYPE (dummy) = integer_type_node;
6378 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6382 /* Now pushdecl the enum constants. */
6383 for (parm = others; parm; parm = next)
6385 next = TREE_CHAIN (parm);
6386 if (DECL_NAME (parm) == 0)
6388 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6390 else if (TREE_CODE (parm) != PARM_DECL)
6394 storetags (chainon (parmtags, gettags ()));
6398 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6399 each with a parm name as the TREE_VALUE.
6401 PARMDECLS is a chain of declarations for parameters.
6402 Warning! It can also contain CONST_DECLs which are not parameters
6403 but are names of enumerators of any enum types
6404 declared among the parameters.
6406 First match each formal parameter name with its declaration.
6407 Associate decls with the names and store the decls
6408 into the TREE_PURPOSE slots. */
6410 /* We use DECL_WEAK as a flag to show which parameters have been
6411 seen already since it is not used on PARM_DECL or CONST_DECL. */
6412 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6413 DECL_WEAK (parm) = 0;
6415 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6417 tree tail, found = NULL;
6419 if (TREE_VALUE (parm) == 0)
6421 error_with_decl (fndecl,
6422 "parameter name missing from parameter list");
6423 TREE_PURPOSE (parm) = 0;
6427 /* See if any of the parmdecls specifies this parm by name.
6428 Ignore any enumerator decls. */
6429 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6430 if (DECL_NAME (tail) == TREE_VALUE (parm)
6431 && TREE_CODE (tail) == PARM_DECL)
6437 /* If declaration already marked, we have a duplicate name.
6438 Complain, and don't use this decl twice. */
6439 if (found && DECL_WEAK (found))
6441 error_with_decl (found, "multiple parameters named `%s'");
6445 /* If the declaration says "void", complain and ignore it. */
6446 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6448 error_with_decl (found, "parameter `%s' declared void");
6449 TREE_TYPE (found) = integer_type_node;
6450 DECL_ARG_TYPE (found) = integer_type_node;
6451 layout_decl (found, 0);
6454 /* If no declaration found, default to int. */
6457 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6459 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6460 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6461 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6463 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6464 else if (extra_warnings)
6465 warning_with_decl (found, "type of `%s' defaults to `int'");
6469 TREE_PURPOSE (parm) = found;
6471 /* Mark this decl as "already found". */
6472 DECL_WEAK (found) = 1;
6475 /* Put anything which is on the parmdecls chain and which is
6476 not a PARM_DECL onto the list NONPARMS. (The types of
6477 non-parm things which might appear on the list include
6478 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6479 any actual PARM_DECLs not matched with any names. */
6482 for (parm = parmdecls; parm;)
6484 tree next = TREE_CHAIN (parm);
6485 TREE_CHAIN (parm) = 0;
6487 if (TREE_CODE (parm) != PARM_DECL)
6488 nonparms = chainon (nonparms, parm);
6491 /* Complain about args with incomplete types. */
6492 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6494 error_with_decl (parm, "parameter `%s' has incomplete type");
6495 TREE_TYPE (parm) = error_mark_node;
6498 if (! DECL_WEAK (parm))
6500 error_with_decl (parm,
6501 "declaration for parameter `%s' but no such parameter");
6502 /* Pretend the parameter was not missing.
6503 This gets us to a standard state and minimizes
6504 further error messages. */
6506 = chainon (specparms,
6507 tree_cons (parm, NULL_TREE, NULL_TREE));
6514 /* Chain the declarations together in the order of the list of
6515 names. Store that chain in the function decl, replacing the
6518 DECL_ARGUMENTS (fndecl) = 0;
6521 for (last = 0; parm; parm = TREE_CHAIN (parm))
6522 if (TREE_PURPOSE (parm))
6525 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6527 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6528 last = TREE_PURPOSE (parm);
6529 TREE_CHAIN (last) = 0;
6533 /* If there was a previous prototype,
6534 set the DECL_ARG_TYPE of each argument according to
6535 the type previously specified, and report any mismatches. */
6537 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6540 for (parm = DECL_ARGUMENTS (fndecl),
6541 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6542 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6543 != void_type_node));
6544 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6546 if (parm == 0 || type == 0
6547 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6549 error ("number of arguments doesn't match prototype");
6550 error_with_file_and_line (current_function_prototype_file,
6551 current_function_prototype_line,
6552 "prototype declaration");
6555 /* Type for passing arg must be consistent with that
6556 declared for the arg. ISO C says we take the unqualified
6557 type for parameters declared with qualified type. */
6558 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6559 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6561 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6562 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6564 /* Adjust argument to match prototype. E.g. a previous
6565 `int foo(float);' prototype causes
6566 `int foo(x) float x; {...}' to be treated like
6567 `int foo(float x) {...}'. This is particularly
6568 useful for argument types like uid_t. */
6569 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6571 if (PROMOTE_PROTOTYPES
6572 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6573 && TYPE_PRECISION (TREE_TYPE (parm))
6574 < TYPE_PRECISION (integer_type_node))
6575 DECL_ARG_TYPE (parm) = integer_type_node;
6579 pedwarn ("promoted argument `%s' doesn't match prototype",
6580 IDENTIFIER_POINTER (DECL_NAME (parm)));
6581 warning_with_file_and_line
6582 (current_function_prototype_file,
6583 current_function_prototype_line,
6584 "prototype declaration");
6589 error ("argument `%s' doesn't match prototype",
6590 IDENTIFIER_POINTER (DECL_NAME (parm)));
6591 error_with_file_and_line (current_function_prototype_file,
6592 current_function_prototype_line,
6593 "prototype declaration");
6597 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6600 /* Otherwise, create a prototype that would match. */
6604 tree actual = 0, last = 0, type;
6606 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6608 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6610 TREE_CHAIN (last) = type;
6615 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6617 TREE_CHAIN (last) = type;
6621 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6622 of the type of this function, but we need to avoid having this
6623 affect the types of other similarly-typed functions, so we must
6624 first force the generation of an identical (but separate) type
6625 node for the relevant function type. The new node we create
6626 will be a variant of the main variant of the original function
6629 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6631 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6634 /* Now store the final chain of decls for the arguments
6635 as the decl-chain of the current lexical scope.
6636 Put the enumerators in as well, at the front so that
6637 DECL_ARGUMENTS is not modified. */
6639 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6642 /* Make sure the binding level for the top of the function body
6643 gets a BLOCK if there are any in the function.
6644 Otherwise, the dbx output is wrong. */
6646 keep_next_if_subblocks = 1;
6648 /* ??? This might be an improvement,
6649 but needs to be thought about some more. */
6651 keep_next_level_flag = 1;
6654 /* Write a record describing this function definition to the prototypes
6655 file (if requested). */
6657 gen_aux_info_record (fndecl, 1, 0, prototype);
6659 /* Initialize the RTL code for the function. */
6660 init_function_start (fndecl, input_filename, lineno);
6662 /* Begin the statement tree for this function. */
6663 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6665 /* If this is a nested function, save away the sizes of any
6666 variable-size types so that we can expand them when generating
6672 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6673 = nreverse (get_pending_sizes ());
6674 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6677 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6680 /* This function is being processed in whole-function mode. */
6681 cfun->x_whole_function_mode_p = 1;
6683 /* Even though we're inside a function body, we still don't want to
6684 call expand_expr to calculate the size of a variable-sized array.
6685 We haven't necessarily assigned RTL to all variables yet, so it's
6686 not safe to try to expand expressions involving them. */
6687 immediate_size_expand = 0;
6688 cfun->x_dont_save_pending_sizes_p = 1;
6690 warn_shadow = saved_warn_shadow;
6693 /* Finish up a function declaration and compile that function
6694 all the way to assembler language output. The free the storage
6695 for the function definition.
6697 This is called after parsing the body of the function definition.
6699 NESTED is nonzero if the function being finished is nested in another.
6700 CAN_DEFER_P is nonzero if the function may be deferred. */
6703 finish_function (nested, can_defer_p)
6707 tree fndecl = current_function_decl;
6710 /* This caused &foo to be of type ptr-to-const-function which then
6711 got a warning when stored in a ptr-to-function variable. */
6712 TREE_READONLY (fndecl) = 1;
6716 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6718 /* Must mark the RESULT_DECL as being in this function. */
6720 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6722 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6724 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6725 != integer_type_node)
6727 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6728 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6730 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6734 #ifdef DEFAULT_MAIN_RETURN
6735 /* Make it so that `main' always returns success by default. */
6736 DEFAULT_MAIN_RETURN;
6739 c_expand_return (integer_zero_node);
6744 finish_fname_decls ();
6746 /* Tie off the statement tree for this function. */
6747 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6749 /* Complain if there's just no return statement. */
6750 if (warn_return_type
6751 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6752 && !current_function_returns_value && !current_function_returns_null
6753 /* Don't complain if we abort. */
6754 && !current_function_returns_abnormally
6755 /* Don't warn for main(). */
6756 && !MAIN_NAME_P (DECL_NAME (fndecl))
6757 /* Or if they didn't actually specify a return type. */
6758 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6759 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6760 inline function, as we might never be compiled separately. */
6761 && DECL_INLINE (fndecl))
6762 warning ("no return statement in function returning non-void");
6764 /* Clear out memory we no longer need. */
6765 free_after_parsing (cfun);
6766 /* Since we never call rest_of_compilation, we never clear
6767 CFUN. Do so explicitly. */
6768 free_after_compilation (cfun);
6773 /* Generate RTL for the body of this function. */
6774 c_expand_body (fndecl, nested, can_defer_p);
6776 /* Let the error reporting routines know that we're outside a
6777 function. For a nested function, this value is used in
6778 c_pop_function_context and then reset via pop_function_context. */
6779 current_function_decl = NULL;
6783 /* Generate the RTL for a deferred function FNDECL. */
6786 c_expand_deferred_function (fndecl)
6789 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6790 function was deferred, e.g. in duplicate_decls. */
6791 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6793 c_expand_body (fndecl, 0, 0);
6794 current_function_decl = NULL;
6798 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6799 then we are already in the process of generating RTL for another
6800 function. If can_defer_p is zero, we won't attempt to defer the
6801 generation of RTL. */
6804 c_expand_body (fndecl, nested_p, can_defer_p)
6806 int nested_p, can_defer_p;
6808 int uninlinable = 1;
6810 /* There's no reason to do any of the work here if we're only doing
6811 semantic analysis; this code just generates RTL. */
6812 if (flag_syntax_only)
6815 if (flag_inline_trees)
6817 /* First, cache whether the current function is inlinable. Some
6818 predicates depend on cfun and current_function_decl to
6819 function completely. */
6820 timevar_push (TV_INTEGRATION);
6821 uninlinable = ! tree_inlinable_function_p (fndecl);
6823 if (! uninlinable && can_defer_p
6824 /* Save function tree for inlining. Should return 0 if the
6825 language does not support function deferring or the
6826 function could not be deferred. */
6827 && defer_fn (fndecl))
6829 /* Let the back-end know that this function exists. */
6830 (*debug_hooks->deferred_inline_function) (fndecl);
6831 timevar_pop (TV_INTEGRATION);
6835 /* Then, inline any functions called in it. */
6836 optimize_inline_calls (fndecl);
6837 timevar_pop (TV_INTEGRATION);
6840 timevar_push (TV_EXPAND);
6844 /* Make sure that we will evaluate variable-sized types involved
6845 in our function's type. */
6846 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6847 /* Squirrel away our current state. */
6848 push_function_context ();
6851 /* Initialize the RTL code for the function. */
6852 current_function_decl = fndecl;
6853 input_filename = DECL_SOURCE_FILE (fndecl);
6854 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6856 /* This function is being processed in whole-function mode. */
6857 cfun->x_whole_function_mode_p = 1;
6859 /* Even though we're inside a function body, we still don't want to
6860 call expand_expr to calculate the size of a variable-sized array.
6861 We haven't necessarily assigned RTL to all variables yet, so it's
6862 not safe to try to expand expressions involving them. */
6863 immediate_size_expand = 0;
6864 cfun->x_dont_save_pending_sizes_p = 1;
6866 /* If this is a varargs function, inform function.c. */
6867 if (c_function_varargs)
6870 /* Set up parameters and prepare for return, for the function. */
6871 expand_function_start (fndecl, 0);
6873 /* If this function is `main', emit a call to `__main'
6874 to run global initializers, etc. */
6875 if (DECL_NAME (fndecl)
6876 && MAIN_NAME_P (DECL_NAME (fndecl))
6877 && DECL_CONTEXT (fndecl) == NULL_TREE)
6878 expand_main_function ();
6880 /* Generate the RTL for this function. */
6881 expand_stmt (DECL_SAVED_TREE (fndecl));
6884 /* Allow the body of the function to be garbage collected. */
6885 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6888 /* We hard-wired immediate_size_expand to zero above.
6889 expand_function_end will decrement this variable. So, we set the
6890 variable to one here, so that after the decrement it will remain
6892 immediate_size_expand = 1;
6894 /* Allow language dialects to perform special processing. */
6895 if (lang_expand_function_end)
6896 (*lang_expand_function_end) ();
6898 /* Generate rtl for function exit. */
6899 expand_function_end (input_filename, lineno, 0);
6901 /* If this is a nested function, protect the local variables in the stack
6902 above us from being collected while we're compiling this function. */
6904 ggc_push_context ();
6906 /* Run the optimizers and output the assembler code for this function. */
6907 rest_of_compilation (fndecl);
6909 /* Undo the GC context switch. */
6913 /* With just -W, complain only if function returns both with
6914 and without a value. */
6916 && current_function_returns_value
6917 && current_function_returns_null)
6918 warning ("this function may return with or without a value");
6920 /* If requested, warn about function definitions where the function will
6921 return a value (usually of some struct or union type) which itself will
6922 take up a lot of stack space. */
6924 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6926 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6928 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6929 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6930 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6933 unsigned int size_as_int
6934 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6936 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6937 warning_with_decl (fndecl,
6938 "size of return value of `%s' is %u bytes",
6941 warning_with_decl (fndecl,
6942 "size of return value of `%s' is larger than %d bytes",
6947 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6948 && ! flag_inline_trees)
6950 /* Stop pointing to the local nodes about to be freed.
6951 But DECL_INITIAL must remain nonzero so we know this
6952 was an actual function definition.
6953 For a nested function, this is done in c_pop_function_context.
6954 If rest_of_compilation set this to 0, leave it 0. */
6955 if (DECL_INITIAL (fndecl) != 0)
6956 DECL_INITIAL (fndecl) = error_mark_node;
6958 DECL_ARGUMENTS (fndecl) = 0;
6961 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6963 if (targetm.have_ctors_dtors)
6964 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6965 DEFAULT_INIT_PRIORITY);
6967 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6970 if (DECL_STATIC_DESTRUCTOR (fndecl))
6972 if (targetm.have_ctors_dtors)
6973 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6974 DEFAULT_INIT_PRIORITY);
6976 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6980 /* Return to the enclosing function. */
6981 pop_function_context ();
6982 timevar_pop (TV_EXPAND);
6985 /* Check the declarations given in a for-loop for satisfying the C99
6988 check_for_loop_decls ()
6994 /* If we get here, declarations have been used in a for loop without
6995 the C99 for loop scope. This doesn't make much sense, so don't
6997 error ("`for' loop initial declaration used outside C99 mode");
7000 /* C99 subclause 6.8.5 paragraph 3:
7002 [#3] The declaration part of a for statement shall only
7003 declare identifiers for objects having storage class auto or
7006 It isn't clear whether, in this sentence, "identifiers" binds to
7007 "shall only declare" or to "objects" - that is, whether all identifiers
7008 declared must be identifiers for objects, or whether the restriction
7009 only applies to those that are. (A question on this in comp.std.c
7010 in November 2000 received no answer.) We implement the strictest
7011 interpretation, to avoid creating an extension which later causes
7014 for (t = gettags (); t; t = TREE_CHAIN (t))
7016 if (TREE_PURPOSE (t) != 0)
7018 enum tree_code code = TREE_CODE (TREE_VALUE (t));
7020 if (code == RECORD_TYPE)
7021 error ("`struct %s' declared in `for' loop initial declaration",
7022 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7023 else if (code == UNION_TYPE)
7024 error ("`union %s' declared in `for' loop initial declaration",
7025 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7027 error ("`enum %s' declared in `for' loop initial declaration",
7028 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7032 for (t = getdecls (); t; t = TREE_CHAIN (t))
7034 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7035 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7036 else if (TREE_STATIC (t))
7037 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7038 else if (DECL_EXTERNAL (t))
7039 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7043 /* Save and restore the variables in this file and elsewhere
7044 that keep track of the progress of compilation of the current function.
7045 Used for nested functions. */
7047 struct language_function GTY(())
7049 struct c_language_function base;
7051 tree shadowed_labels;
7054 int returns_abnormally;
7055 int warn_about_return_type;
7057 struct binding_level *binding_level;
7060 /* Save and reinitialize the variables
7061 used during compilation of a C function. */
7064 c_push_function_context (f)
7067 struct language_function *p;
7068 p = ((struct language_function *)
7069 ggc_alloc (sizeof (struct language_function)));
7072 p->base.x_stmt_tree = c_stmt_tree;
7073 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7074 p->named_labels = named_labels;
7075 p->shadowed_labels = shadowed_labels;
7076 p->returns_value = current_function_returns_value;
7077 p->returns_null = current_function_returns_null;
7078 p->returns_abnormally = current_function_returns_abnormally;
7079 p->warn_about_return_type = warn_about_return_type;
7080 p->extern_inline = current_extern_inline;
7081 p->binding_level = current_binding_level;
7084 /* Restore the variables used during compilation of a C function. */
7087 c_pop_function_context (f)
7090 struct language_function *p = f->language;
7093 /* Bring back all the labels that were shadowed. */
7094 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7095 if (DECL_NAME (TREE_VALUE (link)) != 0)
7096 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7097 = TREE_VALUE (link);
7099 if (DECL_SAVED_INSNS (current_function_decl) == 0
7100 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7102 /* Stop pointing to the local nodes about to be freed. */
7103 /* But DECL_INITIAL must remain nonzero so we know this
7104 was an actual function definition. */
7105 DECL_INITIAL (current_function_decl) = error_mark_node;
7106 DECL_ARGUMENTS (current_function_decl) = 0;
7109 c_stmt_tree = p->base.x_stmt_tree;
7110 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7111 named_labels = p->named_labels;
7112 shadowed_labels = p->shadowed_labels;
7113 current_function_returns_value = p->returns_value;
7114 current_function_returns_null = p->returns_null;
7115 current_function_returns_abnormally = p->returns_abnormally;
7116 warn_about_return_type = p->warn_about_return_type;
7117 current_extern_inline = p->extern_inline;
7118 current_binding_level = p->binding_level;
7123 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7126 c_dup_lang_specific_decl (decl)
7129 struct lang_decl *ld;
7131 if (!DECL_LANG_SPECIFIC (decl))
7134 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7135 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7136 sizeof (struct lang_decl));
7137 DECL_LANG_SPECIFIC (decl) = ld;
7140 /* The functions below are required for functionality of doing
7141 function at once processing in the C front end. Currently these
7142 functions are not called from anywhere in the C front end, but as
7143 these changes continue, that will change. */
7145 /* Returns non-zero if the current statement is a full expression,
7146 i.e. temporaries created during that statement should be destroyed
7147 at the end of the statement. */
7150 stmts_are_full_exprs_p ()
7155 /* Returns the stmt_tree (if any) to which statements are currently
7156 being added. If there is no active statement-tree, NULL is
7160 current_stmt_tree ()
7162 return &c_stmt_tree;
7165 /* Returns the stack of SCOPE_STMTs for the current function. */
7168 current_scope_stmt_stack ()
7170 return &c_scope_stmt_stack;
7173 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7177 anon_aggr_type_p (node)
7178 tree node ATTRIBUTE_UNUSED;
7183 /* Dummy function in place of callback used by C++. */
7186 extract_interface_info ()
7190 /* Return a new COMPOUND_STMT, after adding it to the current
7194 c_begin_compound_stmt ()
7198 /* Create the COMPOUND_STMT. */
7199 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7204 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7208 c_expand_decl_stmt (t)
7211 tree decl = DECL_STMT_DECL (t);
7213 /* Expand nested functions. */
7214 if (TREE_CODE (decl) == FUNCTION_DECL
7215 && DECL_CONTEXT (decl) == current_function_decl
7216 && DECL_SAVED_TREE (decl))
7217 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7220 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7221 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7224 identifier_global_value (t)
7227 return IDENTIFIER_GLOBAL_VALUE (t);
7230 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7231 otherwise the name is found in ridpointers from RID_INDEX. */
7234 record_builtin_type (rid_index, name, type)
7241 id = ridpointers[(int) rid_index];
7243 id = get_identifier (name);
7244 pushdecl (build_decl (TYPE_DECL, id, type));
7247 /* Build the void_list_node (void_type_node having been created). */
7249 build_void_list_node ()
7251 tree t = build_tree_list (NULL_TREE, void_type_node);
7255 /* Return something to represent absolute declarators containing a *.
7256 TARGET is the absolute declarator that the * contains.
7257 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
7258 to apply to the pointer type, represented as identifiers, possible mixed
7261 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
7262 if attributes are present) and whose type is the modifier list. */
7265 make_pointer_declarator (type_quals_attrs, target)
7266 tree type_quals_attrs, target;
7269 tree itarget = target;
7270 split_specs_attrs (type_quals_attrs, &quals, &attrs);
7271 if (attrs != NULL_TREE)
7272 itarget = tree_cons (attrs, target, NULL_TREE);
7273 return build1 (INDIRECT_REF, quals, itarget);
7276 #include "gt-c-decl.h"