1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
37 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
39 { NORMAL, /* Ordinary declaration */
40 FUNCDEF, /* Function definition */
41 PARM, /* Declaration of parm before function body */
42 FIELD, /* Declaration inside struct or union */
43 BITFIELD, /* Likewise but with specified width */
44 TYPENAME}; /* Typename (inside cast or sizeof) */
46 #ifndef CHAR_TYPE_SIZE
47 #define CHAR_TYPE_SIZE BITS_PER_UNIT
50 #ifndef SHORT_TYPE_SIZE
51 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
55 #define INT_TYPE_SIZE BITS_PER_WORD
58 #ifndef LONG_TYPE_SIZE
59 #define LONG_TYPE_SIZE BITS_PER_WORD
62 #ifndef LONG_LONG_TYPE_SIZE
63 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
66 #ifndef WCHAR_UNSIGNED
67 #define WCHAR_UNSIGNED 0
70 #ifndef FLOAT_TYPE_SIZE
71 #define FLOAT_TYPE_SIZE BITS_PER_WORD
74 #ifndef DOUBLE_TYPE_SIZE
75 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
78 #ifndef LONG_DOUBLE_TYPE_SIZE
79 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
82 /* We let tm.h override the types used here, to handle trivial differences
83 such as the choice of unsigned int or long unsigned int for size_t.
84 When machines start needing nontrivial differences in the size type,
85 it would be best to do something here to figure out automatically
86 from other information what type to use. */
89 #define SIZE_TYPE "long unsigned int"
93 #define PTRDIFF_TYPE "long int"
97 #define WCHAR_TYPE "int"
100 /* a node which has tree code ERROR_MARK, and whose type is itself.
101 All erroneous expressions are replaced with this node. All functions
102 that accept nodes as arguments should avoid generating error messages
103 if this node is one of the arguments, since it is undesirable to get
104 multiple error messages from one error in the input. */
106 tree error_mark_node;
108 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
110 tree short_integer_type_node;
111 tree integer_type_node;
112 tree long_integer_type_node;
113 tree long_long_integer_type_node;
115 tree short_unsigned_type_node;
116 tree unsigned_type_node;
117 tree long_unsigned_type_node;
118 tree long_long_unsigned_type_node;
120 tree boolean_type_node;
121 tree boolean_false_node;
122 tree boolean_true_node;
124 tree ptrdiff_type_node;
126 tree unsigned_char_type_node;
127 tree signed_char_type_node;
129 tree wchar_type_node;
130 tree signed_wchar_type_node;
131 tree unsigned_wchar_type_node;
133 tree float_type_node;
134 tree double_type_node;
135 tree long_double_type_node;
137 tree complex_integer_type_node;
138 tree complex_float_type_node;
139 tree complex_double_type_node;
140 tree complex_long_double_type_node;
142 tree intQI_type_node;
143 tree intHI_type_node;
144 tree intSI_type_node;
145 tree intDI_type_node;
147 tree unsigned_intQI_type_node;
148 tree unsigned_intHI_type_node;
149 tree unsigned_intSI_type_node;
150 tree unsigned_intDI_type_node;
152 /* a VOID_TYPE node. */
156 /* Nodes for types `void *' and `const void *'. */
158 tree ptr_type_node, const_ptr_type_node;
160 /* Nodes for types `char *' and `const char *'. */
162 tree string_type_node, const_string_type_node;
164 /* Type `char[SOMENUMBER]'.
165 Used when an array of char is needed and the size is irrelevant. */
167 tree char_array_type_node;
169 /* Type `int[SOMENUMBER]' or something like it.
170 Used when an array of int needed and the size is irrelevant. */
172 tree int_array_type_node;
174 /* Type `wchar_t[SOMENUMBER]' or something like it.
175 Used when a wide string literal is created. */
177 tree wchar_array_type_node;
179 /* type `int ()' -- used for implicit declaration of functions. */
181 tree default_function_type;
183 /* function types `double (double)' and `double (double, double)', etc. */
185 tree double_ftype_double, double_ftype_double_double;
186 tree int_ftype_int, long_ftype_long;
187 tree float_ftype_float;
188 tree ldouble_ftype_ldouble;
190 /* Function type `void (void *, void *, int)' and similar ones */
192 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
194 /* Function type `char *(char *, char *)' and similar ones */
195 tree string_ftype_ptr_ptr, int_ftype_string_string;
197 /* Function type `int (const void *, const void *, size_t)' */
198 tree int_ftype_cptr_cptr_sizet;
200 /* Two expressions that are constants with value zero.
201 The first is of type `int', the second of type `void *'. */
203 tree integer_zero_node;
204 tree null_pointer_node;
206 /* A node for the integer constant 1. */
208 tree integer_one_node;
210 /* Nonzero if we have seen an invalid cross reference
211 to a struct, union, or enum, but not yet printed the message. */
213 tree pending_invalid_xref;
214 /* File and line to appear in the eventual error message. */
215 char *pending_invalid_xref_file;
216 int pending_invalid_xref_line;
218 /* While defining an enum type, this is 1 plus the last enumerator
219 constant value. Note that will do not have to save this or `enum_overflow'
220 around nested function definition since such a definition could only
221 occur in an enum value expression and we don't use these variables in
224 static tree enum_next_value;
226 /* Nonzero means that there was overflow computing enum_next_value. */
228 static int enum_overflow;
230 /* Parsing a function declarator leaves a list of parameter names
231 or a chain or parameter decls here. */
233 static tree last_function_parms;
235 /* Parsing a function declarator leaves here a chain of structure
236 and enum types declared in the parmlist. */
238 static tree last_function_parm_tags;
240 /* After parsing the declarator that starts a function definition,
241 `start_function' puts here the list of parameter names or chain of decls.
242 `store_parm_decls' finds it here. */
244 static tree current_function_parms;
246 /* Similar, for last_function_parm_tags. */
247 static tree current_function_parm_tags;
249 /* Similar, for the file and line that the prototype came from if this is
250 an old-style definition. */
251 static char *current_function_prototype_file;
252 static int current_function_prototype_line;
254 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
255 that have names. Here so we can clear out their names' definitions
256 at the end of the function. */
258 static tree named_labels;
260 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
262 static tree shadowed_labels;
264 /* Nonzero when store_parm_decls is called indicates a varargs function.
265 Value not meaningful after store_parm_decls. */
267 static int c_function_varargs;
269 /* The FUNCTION_DECL for the function currently being compiled,
270 or 0 if between functions. */
271 tree current_function_decl;
273 /* Set to 0 at beginning of a function definition, set to 1 if
274 a return statement that specifies a return value is seen. */
276 int current_function_returns_value;
278 /* Set to 0 at beginning of a function definition, set to 1 if
279 a return statement with no argument is seen. */
281 int current_function_returns_null;
283 /* Set to nonzero by `grokdeclarator' for a function
284 whose return type is defaulted, if warnings for this are desired. */
286 static int warn_about_return_type;
288 /* Nonzero when starting a function declared `extern inline'. */
290 static int current_extern_inline;
292 /* For each binding contour we allocate a binding_level structure
293 * which records the names defined in that contour.
296 * 1) one for each function definition,
297 * where internal declarations of the parameters appear.
298 * 2) one for each compound statement,
299 * to record its declarations.
301 * The current meaning of a name can be found by searching the levels from
302 * the current one out to the global one.
305 /* Note that the information in the `names' component of the global contour
306 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
310 /* A chain of _DECL nodes for all variables, constants, functions,
311 and typedef types. These are in the reverse of the order supplied.
315 /* A list of structure, union and enum definitions,
316 * for looking up tag names.
317 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
318 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
319 * or ENUMERAL_TYPE node.
323 /* For each level, a list of shadowed outer-level local definitions
324 to be restored when this level is popped.
325 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
326 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
329 /* For each level (except not the global one),
330 a chain of BLOCK nodes for all the levels
331 that were entered and exited one level down. */
334 /* The BLOCK node for this level, if one has been preallocated.
335 If 0, the BLOCK is allocated (if needed) when the level is popped. */
338 /* The binding level which this one is contained in (inherits from). */
339 struct binding_level *level_chain;
341 /* Nonzero for the level that holds the parameters of a function. */
344 /* Nonzero if this level "doesn't exist" for tags. */
345 char tag_transparent;
347 /* Nonzero if sublevels of this level "don't exist" for tags.
348 This is set in the parm level of a function definition
349 while reading the function body, so that the outermost block
350 of the function body will be tag-transparent. */
351 char subblocks_tag_transparent;
353 /* Nonzero means make a BLOCK for this level regardless of all else. */
356 /* Nonzero means make a BLOCK if this level has any subblocks. */
357 char keep_if_subblocks;
359 /* Number of decls in `names' that have incomplete
360 structure or union types. */
363 /* A list of decls giving the (reversed) specified order of parms,
364 not including any forward-decls in the parmlist.
365 This is so we can put the parms in proper order for assign_parms. */
369 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
371 /* The binding level currently in effect. */
373 static struct binding_level *current_binding_level;
375 /* A chain of binding_level structures awaiting reuse. */
377 static struct binding_level *free_binding_level;
379 /* The outermost binding level, for names of file scope.
380 This is created when the compiler is started and exists
381 through the entire run. */
383 static struct binding_level *global_binding_level;
385 /* Binding level structures are initialized by copying this one. */
387 static struct binding_level clear_binding_level
388 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
391 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
393 static int keep_next_level_flag;
395 /* Nonzero means make a BLOCK for the next level pushed
396 if it has subblocks. */
398 static int keep_next_if_subblocks;
400 /* The chain of outer levels of label scopes.
401 This uses the same data structure used for binding levels,
402 but it works differently: each link in the chain records
403 saved values of named_labels and shadowed_labels for
404 a label binding level outside the current one. */
406 static struct binding_level *label_level_chain;
408 /* Functions called automatically at the beginning and end of execution. */
410 tree static_ctors, static_dtors;
412 /* Forward declarations. */
414 static struct binding_level * make_binding_level PROTO((void));
415 static void clear_limbo_values PROTO((tree));
416 static int duplicate_decls PROTO((tree, tree, int));
417 static char *redeclaration_error_message PROTO((tree, tree));
418 static void storedecls PROTO((tree));
419 static void storetags PROTO((tree));
420 static tree lookup_tag PROTO((enum tree_code, tree,
421 struct binding_level *, int));
422 static tree lookup_tag_reverse PROTO((tree));
423 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
425 static tree grokparms PROTO((tree, int));
426 static int field_decl_cmp PROTO((tree *, tree *));
427 static void layout_array_type PROTO((tree));
429 /* C-specific option variables. */
431 /* Nonzero means allow type mismatches in conditional expressions;
432 just make their values `void'. */
434 int flag_cond_mismatch;
436 /* Nonzero means give `double' the same size as `float'. */
438 int flag_short_double;
440 /* Nonzero means don't recognize the keyword `asm'. */
444 /* Nonzero means don't recognize any builtin functions. */
448 /* Nonzero means don't recognize the non-ANSI builtin functions.
451 int flag_no_nonansi_builtin;
453 /* Nonzero means do some things the same way PCC does. */
455 int flag_traditional;
457 /* Nonzero means to allow single precision math even if we're generally
458 being traditional. */
459 int flag_allow_single_precision = 0;
461 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
463 int flag_signed_bitfields = 1;
464 int explicit_flag_signed_bitfields = 0;
466 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
468 int flag_no_ident = 0;
470 /* Nonzero means warn about implicit declarations. */
474 /* Nonzero means give string constants the type `const char *'
475 to get extra warnings from them. These warnings will be too numerous
476 to be useful, except in thoroughly ANSIfied programs. */
478 int warn_write_strings;
480 /* Nonzero means warn about pointer casts that can drop a type qualifier
481 from the pointer target type. */
485 /* Nonzero means warn when casting a function call to a type that does
486 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
487 when there is no previous declaration of sqrt or malloc. */
489 int warn_bad_function_cast;
491 /* Warn about traditional constructs whose meanings changed in ANSI C. */
493 int warn_traditional;
495 /* Nonzero means warn about sizeof(function) or addition/subtraction
496 of function pointers. */
498 int warn_pointer_arith;
500 /* Nonzero means warn for non-prototype function decls
501 or non-prototyped defs without previous prototype. */
503 int warn_strict_prototypes;
505 /* Nonzero means warn for any global function def
506 without separate previous prototype decl. */
508 int warn_missing_prototypes;
510 /* Nonzero means warn for any global function def
511 without separate previous decl. */
513 int warn_missing_declarations;
515 /* Nonzero means warn about multiple (redundant) decls for the same single
516 variable or function. */
518 int warn_redundant_decls = 0;
520 /* Nonzero means warn about extern declarations of objects not at
521 file-scope level and about *all* declarations of functions (whether
522 extern or static) not at file-scope level. Note that we exclude
523 implicit function declarations. To get warnings about those, use
526 int warn_nested_externs = 0;
528 /* Warn about *printf or *scanf format/argument anomalies. */
532 /* Warn about a subscript that has type char. */
534 int warn_char_subscripts = 0;
536 /* Warn if a type conversion is done that might have confusing results. */
540 /* Warn if adding () is suggested. */
542 int warn_parentheses;
544 /* Warn if initializer is not completely bracketed. */
546 int warn_missing_braces;
548 /* Warn about comparison of signed and unsigned values. */
550 int warn_sign_compare;
552 /* Nonzero means `$' can be in an identifier. */
554 #ifndef DOLLARS_IN_IDENTIFIERS
555 #define DOLLARS_IN_IDENTIFIERS 1
557 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
559 /* Decode the string P as a language-specific option for C.
560 Return 1 if it is recognized (and handle it);
561 return 0 if not recognized. */
567 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
569 flag_traditional = 1;
570 flag_writable_strings = 1;
572 else if (!strcmp (p, "-fallow-single-precision"))
573 flag_allow_single_precision = 1;
574 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
576 flag_traditional = 0;
577 flag_writable_strings = 0;
579 else if (!strcmp (p, "-fdollars-in-identifiers"))
580 dollars_in_ident = 1;
581 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
582 dollars_in_ident = 0;
583 else if (!strcmp (p, "-fsigned-char"))
584 flag_signed_char = 1;
585 else if (!strcmp (p, "-funsigned-char"))
586 flag_signed_char = 0;
587 else if (!strcmp (p, "-fno-signed-char"))
588 flag_signed_char = 0;
589 else if (!strcmp (p, "-fno-unsigned-char"))
590 flag_signed_char = 1;
591 else if (!strcmp (p, "-fsigned-bitfields")
592 || !strcmp (p, "-fno-unsigned-bitfields"))
594 flag_signed_bitfields = 1;
595 explicit_flag_signed_bitfields = 1;
597 else if (!strcmp (p, "-funsigned-bitfields")
598 || !strcmp (p, "-fno-signed-bitfields"))
600 flag_signed_bitfields = 0;
601 explicit_flag_signed_bitfields = 1;
603 else if (!strcmp (p, "-fshort-enums"))
604 flag_short_enums = 1;
605 else if (!strcmp (p, "-fno-short-enums"))
606 flag_short_enums = 0;
607 else if (!strcmp (p, "-fcond-mismatch"))
608 flag_cond_mismatch = 1;
609 else if (!strcmp (p, "-fno-cond-mismatch"))
610 flag_cond_mismatch = 0;
611 else if (!strcmp (p, "-fshort-double"))
612 flag_short_double = 1;
613 else if (!strcmp (p, "-fno-short-double"))
614 flag_short_double = 0;
615 else if (!strcmp (p, "-fasm"))
617 else if (!strcmp (p, "-fno-asm"))
619 else if (!strcmp (p, "-fbuiltin"))
621 else if (!strcmp (p, "-fno-builtin"))
623 else if (!strcmp (p, "-fno-ident"))
625 else if (!strcmp (p, "-fident"))
627 else if (!strcmp (p, "-ansi"))
628 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
629 else if (!strcmp (p, "-Wimplicit"))
631 else if (!strcmp (p, "-Wno-implicit"))
633 else if (!strcmp (p, "-Wwrite-strings"))
634 warn_write_strings = 1;
635 else if (!strcmp (p, "-Wno-write-strings"))
636 warn_write_strings = 0;
637 else if (!strcmp (p, "-Wcast-qual"))
639 else if (!strcmp (p, "-Wno-cast-qual"))
641 else if (!strcmp (p, "-Wbad-function-cast"))
642 warn_bad_function_cast = 1;
643 else if (!strcmp (p, "-Wno-bad-function-cast"))
644 warn_bad_function_cast = 0;
645 else if (!strcmp (p, "-Wpointer-arith"))
646 warn_pointer_arith = 1;
647 else if (!strcmp (p, "-Wno-pointer-arith"))
648 warn_pointer_arith = 0;
649 else if (!strcmp (p, "-Wstrict-prototypes"))
650 warn_strict_prototypes = 1;
651 else if (!strcmp (p, "-Wno-strict-prototypes"))
652 warn_strict_prototypes = 0;
653 else if (!strcmp (p, "-Wmissing-prototypes"))
654 warn_missing_prototypes = 1;
655 else if (!strcmp (p, "-Wno-missing-prototypes"))
656 warn_missing_prototypes = 0;
657 else if (!strcmp (p, "-Wmissing-declarations"))
658 warn_missing_declarations = 1;
659 else if (!strcmp (p, "-Wno-missing-declarations"))
660 warn_missing_declarations = 0;
661 else if (!strcmp (p, "-Wredundant-decls"))
662 warn_redundant_decls = 1;
663 else if (!strcmp (p, "-Wno-redundant-decls"))
664 warn_redundant_decls = 0;
665 else if (!strcmp (p, "-Wnested-externs"))
666 warn_nested_externs = 1;
667 else if (!strcmp (p, "-Wno-nested-externs"))
668 warn_nested_externs = 0;
669 else if (!strcmp (p, "-Wtraditional"))
670 warn_traditional = 1;
671 else if (!strcmp (p, "-Wno-traditional"))
672 warn_traditional = 0;
673 else if (!strcmp (p, "-Wformat"))
675 else if (!strcmp (p, "-Wno-format"))
677 else if (!strcmp (p, "-Wchar-subscripts"))
678 warn_char_subscripts = 1;
679 else if (!strcmp (p, "-Wno-char-subscripts"))
680 warn_char_subscripts = 0;
681 else if (!strcmp (p, "-Wconversion"))
683 else if (!strcmp (p, "-Wno-conversion"))
685 else if (!strcmp (p, "-Wparentheses"))
686 warn_parentheses = 1;
687 else if (!strcmp (p, "-Wno-parentheses"))
688 warn_parentheses = 0;
689 else if (!strcmp (p, "-Wreturn-type"))
690 warn_return_type = 1;
691 else if (!strcmp (p, "-Wno-return-type"))
692 warn_return_type = 0;
693 else if (!strcmp (p, "-Wcomment"))
694 ; /* cpp handles this one. */
695 else if (!strcmp (p, "-Wno-comment"))
696 ; /* cpp handles this one. */
697 else if (!strcmp (p, "-Wcomments"))
698 ; /* cpp handles this one. */
699 else if (!strcmp (p, "-Wno-comments"))
700 ; /* cpp handles this one. */
701 else if (!strcmp (p, "-Wtrigraphs"))
702 ; /* cpp handles this one. */
703 else if (!strcmp (p, "-Wno-trigraphs"))
704 ; /* cpp handles this one. */
705 else if (!strcmp (p, "-Wimport"))
706 ; /* cpp handles this one. */
707 else if (!strcmp (p, "-Wno-import"))
708 ; /* cpp handles this one. */
709 else if (!strcmp (p, "-Wmissing-braces"))
710 warn_missing_braces = 1;
711 else if (!strcmp (p, "-Wno-missing-braces"))
712 warn_missing_braces = 0;
713 else if (!strcmp (p, "-Wsign-compare"))
714 warn_sign_compare = 1;
715 else if (!strcmp (p, "-Wno-sign-compare"))
716 warn_sign_compare = 0;
717 else if (!strcmp (p, "-Wall"))
719 /* We save the value of warn_uninitialized, since if they put
720 -Wuninitialized on the command line, we need to generate a
721 warning about not using it without also specifying -O. */
722 if (warn_uninitialized != 1)
723 warn_uninitialized = 2;
725 warn_return_type = 1;
729 warn_char_subscripts = 1;
730 warn_parentheses = 1;
731 warn_missing_braces = 1;
732 warn_sign_compare = 1;
740 /* Hooks for print_node. */
743 print_lang_decl (file, node, indent)
751 print_lang_type (file, node, indent)
759 print_lang_identifier (file, node, indent)
764 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
765 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
766 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
767 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
768 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
769 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
772 /* Hook called at end of compilation to assume 1 elt
773 for a top-level array decl that wasn't complete before. */
776 finish_incomplete_decl (decl)
779 if (TREE_CODE (decl) == VAR_DECL)
781 tree type = TREE_TYPE (decl);
782 if (type != error_mark_node
783 && TREE_CODE (type) == ARRAY_TYPE
784 && TYPE_DOMAIN (type) == 0)
786 if (! DECL_EXTERNAL (decl))
787 warning_with_decl (decl, "array `%s' assumed to have one element");
789 complete_array_type (type, NULL_TREE, 1);
791 layout_decl (decl, 0);
796 /* Create a new `struct binding_level'. */
799 struct binding_level *
800 make_binding_level ()
803 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
806 /* Nonzero if we are currently in the global binding level. */
811 return current_binding_level == global_binding_level;
817 keep_next_level_flag = 1;
820 /* Nonzero if the current level needs to have a BLOCK made. */
825 return ((current_binding_level->keep_if_subblocks
826 && current_binding_level->blocks != 0)
827 || current_binding_level->keep
828 || current_binding_level->names != 0
829 || (current_binding_level->tags != 0
830 && !current_binding_level->tag_transparent));
833 /* Identify this binding level as a level of parameters.
834 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
835 But it turns out there is no way to pass the right value for
836 DEFINITION_FLAG, so we ignore it. */
839 declare_parm_level (definition_flag)
842 current_binding_level->parm_flag = 1;
845 /* Nonzero if currently making parm declarations. */
850 return current_binding_level->parm_flag;
853 /* Enter a new binding level.
854 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
855 not for that of tags. */
858 pushlevel (tag_transparent)
861 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
863 /* If this is the top level of a function,
864 just make sure that NAMED_LABELS is 0. */
866 if (current_binding_level == global_binding_level)
871 /* Reuse or create a struct for this binding level. */
873 if (free_binding_level)
875 newlevel = free_binding_level;
876 free_binding_level = free_binding_level->level_chain;
880 newlevel = make_binding_level ();
883 /* Add this level to the front of the chain (stack) of levels that
886 *newlevel = clear_binding_level;
887 newlevel->tag_transparent
889 || (current_binding_level
890 ? current_binding_level->subblocks_tag_transparent
892 newlevel->level_chain = current_binding_level;
893 current_binding_level = newlevel;
894 newlevel->keep = keep_next_level_flag;
895 keep_next_level_flag = 0;
896 newlevel->keep_if_subblocks = keep_next_if_subblocks;
897 keep_next_if_subblocks = 0;
900 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
903 clear_limbo_values (block)
908 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
909 if (DECL_NAME (tem) != 0)
910 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
912 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
913 clear_limbo_values (tem);
916 /* Exit a binding level.
917 Pop the level off, and restore the state of the identifier-decl mappings
918 that were in effect when this level was entered.
920 If KEEP is nonzero, this level had explicit declarations, so
921 and create a "block" (a BLOCK node) for the level
922 to record its declarations and subblocks for symbol table output.
924 If FUNCTIONBODY is nonzero, this level is the body of a function,
925 so create a block as if KEEP were set and also clear out all
928 If REVERSE is nonzero, reverse the order of decls before putting
929 them into the BLOCK. */
932 poplevel (keep, reverse, functionbody)
938 /* The chain of decls was accumulated in reverse order.
939 Put it into forward order, just for cleanliness. */
941 tree tags = current_binding_level->tags;
942 tree subblocks = current_binding_level->blocks;
945 int block_previously_created;
947 keep |= current_binding_level->keep;
949 /* This warning is turned off because it causes warnings for
950 declarations like `extern struct foo *x'. */
952 /* Warn about incomplete structure types in this level. */
953 for (link = tags; link; link = TREE_CHAIN (link))
954 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
956 tree type = TREE_VALUE (link);
958 switch (TREE_CODE (type))
961 errmsg = "`struct %s' incomplete in scope ending here";
964 errmsg = "`union %s' incomplete in scope ending here";
967 errmsg = "`enum %s' incomplete in scope ending here";
970 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
971 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
973 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
974 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
978 /* Get the decls in the order they were written.
979 Usually current_binding_level->names is in reverse order.
980 But parameter decls were previously put in forward order. */
983 current_binding_level->names
984 = decls = nreverse (current_binding_level->names);
986 decls = current_binding_level->names;
988 /* Output any nested inline functions within this block
989 if they weren't already output. */
991 for (decl = decls; decl; decl = TREE_CHAIN (decl))
992 if (TREE_CODE (decl) == FUNCTION_DECL
993 && ! TREE_ASM_WRITTEN (decl)
994 && DECL_INITIAL (decl) != 0
995 && TREE_ADDRESSABLE (decl))
997 /* If this decl was copied from a file-scope decl
998 on account of a block-scope extern decl,
999 propagate TREE_ADDRESSABLE to the file-scope decl.
1001 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1002 true, since then the decl goes through save_for_inline_copying. */
1003 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1004 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1005 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1008 push_function_context ();
1009 output_inline_function (decl);
1010 pop_function_context ();
1014 /* If there were any declarations or structure tags in that level,
1015 or if this level is a function body,
1016 create a BLOCK to record them for the life of this function. */
1019 block_previously_created = (current_binding_level->this_block != 0);
1020 if (block_previously_created)
1021 block = current_binding_level->this_block;
1022 else if (keep || functionbody
1023 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1024 block = make_node (BLOCK);
1027 BLOCK_VARS (block) = decls;
1028 BLOCK_TYPE_TAGS (block) = tags;
1029 BLOCK_SUBBLOCKS (block) = subblocks;
1030 remember_end_note (block);
1033 /* In each subblock, record that this is its superior. */
1035 for (link = subblocks; link; link = TREE_CHAIN (link))
1036 BLOCK_SUPERCONTEXT (link) = block;
1038 /* Clear out the meanings of the local variables of this level. */
1040 for (link = decls; link; link = TREE_CHAIN (link))
1042 if (DECL_NAME (link) != 0)
1044 /* If the ident. was used or addressed via a local extern decl,
1045 don't forget that fact. */
1046 if (DECL_EXTERNAL (link))
1048 if (TREE_USED (link))
1049 TREE_USED (DECL_NAME (link)) = 1;
1050 if (TREE_ADDRESSABLE (link))
1051 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1053 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1057 /* Restore all name-meanings of the outer levels
1058 that were shadowed by this level. */
1060 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1061 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1063 /* If the level being exited is the top level of a function,
1064 check over all the labels, and clear out the current
1065 (function local) meanings of their names. */
1069 clear_limbo_values (block);
1071 /* If this is the top level block of a function,
1072 the vars are the function's parameters.
1073 Don't leave them in the BLOCK because they are
1074 found in the FUNCTION_DECL instead. */
1076 BLOCK_VARS (block) = 0;
1078 /* Clear out the definitions of all label names,
1079 since their scopes end here,
1080 and add them to BLOCK_VARS. */
1082 for (link = named_labels; link; link = TREE_CHAIN (link))
1084 register tree label = TREE_VALUE (link);
1086 if (DECL_INITIAL (label) == 0)
1088 error_with_decl (label, "label `%s' used but not defined");
1089 /* Avoid crashing later. */
1090 define_label (input_filename, lineno,
1093 else if (warn_unused && !TREE_USED (label))
1094 warning_with_decl (label, "label `%s' defined but not used");
1095 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1097 /* Put the labels into the "variables" of the
1098 top-level block, so debugger can see them. */
1099 TREE_CHAIN (label) = BLOCK_VARS (block);
1100 BLOCK_VARS (block) = label;
1104 /* Pop the current level, and free the structure for reuse. */
1107 register struct binding_level *level = current_binding_level;
1108 current_binding_level = current_binding_level->level_chain;
1110 level->level_chain = free_binding_level;
1111 free_binding_level = level;
1114 /* Dispose of the block that we just made inside some higher level. */
1116 DECL_INITIAL (current_function_decl) = block;
1119 if (!block_previously_created)
1120 current_binding_level->blocks
1121 = chainon (current_binding_level->blocks, block);
1123 /* If we did not make a block for the level just exited,
1124 any blocks made for inner levels
1125 (since they cannot be recorded as subblocks in that level)
1126 must be carried forward so they will later become subblocks
1127 of something else. */
1129 current_binding_level->blocks
1130 = chainon (current_binding_level->blocks, subblocks);
1132 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1133 binding contour so that they point to the appropriate construct, i.e.
1134 either to the current FUNCTION_DECL node, or else to the BLOCK node
1135 we just constructed.
1137 Note that for tagged types whose scope is just the formal parameter
1138 list for some function type specification, we can't properly set
1139 their TYPE_CONTEXTs here, because we don't have a pointer to the
1140 appropriate FUNCTION_TYPE node readily available to us. For those
1141 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1142 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1143 node which will represent the "scope" for these "parameter list local"
1148 for (link = tags; link; link = TREE_CHAIN (link))
1149 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1151 for (link = tags; link; link = TREE_CHAIN (link))
1152 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1155 TREE_USED (block) = 1;
1159 /* Delete the node BLOCK from the current binding level.
1160 This is used for the block inside a stmt expr ({...})
1161 so that the block can be reinserted where appropriate. */
1164 delete_block (block)
1168 if (current_binding_level->blocks == block)
1169 current_binding_level->blocks = TREE_CHAIN (block);
1170 for (t = current_binding_level->blocks; t;)
1172 if (TREE_CHAIN (t) == block)
1173 TREE_CHAIN (t) = TREE_CHAIN (block);
1177 TREE_CHAIN (block) = NULL;
1178 /* Clear TREE_USED which is always set by poplevel.
1179 The flag is set again if insert_block is called. */
1180 TREE_USED (block) = 0;
1183 /* Insert BLOCK at the end of the list of subblocks of the
1184 current binding level. This is used when a BIND_EXPR is expanded,
1185 to handle the BLOCK node inside the BIND_EXPR. */
1188 insert_block (block)
1191 TREE_USED (block) = 1;
1192 current_binding_level->blocks
1193 = chainon (current_binding_level->blocks, block);
1196 /* Set the BLOCK node for the innermost scope
1197 (the one we are currently in). */
1201 register tree block;
1203 current_binding_level->this_block = block;
1209 register struct binding_level *newlevel;
1211 /* Reuse or create a struct for this binding level. */
1213 if (free_binding_level)
1215 newlevel = free_binding_level;
1216 free_binding_level = free_binding_level->level_chain;
1220 newlevel = make_binding_level ();
1223 /* Add this level to the front of the chain (stack) of label levels. */
1225 newlevel->level_chain = label_level_chain;
1226 label_level_chain = newlevel;
1228 newlevel->names = named_labels;
1229 newlevel->shadowed = shadowed_labels;
1231 shadowed_labels = 0;
1237 register struct binding_level *level = label_level_chain;
1240 /* Clear out the definitions of the declared labels in this level.
1241 Leave in the list any ordinary, non-declared labels. */
1242 for (link = named_labels, prev = 0; link;)
1244 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1246 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1248 error_with_decl (TREE_VALUE (link),
1249 "label `%s' used but not defined");
1250 /* Avoid crashing later. */
1251 define_label (input_filename, lineno,
1252 DECL_NAME (TREE_VALUE (link)));
1254 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1255 warning_with_decl (TREE_VALUE (link),
1256 "label `%s' defined but not used");
1257 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1259 /* Delete this element from the list. */
1260 link = TREE_CHAIN (link);
1262 TREE_CHAIN (prev) = link;
1264 named_labels = link;
1269 link = TREE_CHAIN (link);
1273 /* Bring back all the labels that were shadowed. */
1274 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1275 if (DECL_NAME (TREE_VALUE (link)) != 0)
1276 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1277 = TREE_VALUE (link);
1279 named_labels = chainon (named_labels, level->names);
1280 shadowed_labels = level->shadowed;
1282 /* Pop the current level, and free the structure for reuse. */
1283 label_level_chain = label_level_chain->level_chain;
1284 level->level_chain = free_binding_level;
1285 free_binding_level = level;
1288 /* Push a definition or a declaration of struct, union or enum tag "name".
1289 "type" should be the type node.
1290 We assume that the tag "name" is not already defined.
1292 Note that the definition may really be just a forward reference.
1293 In that case, the TYPE_SIZE will be zero. */
1296 pushtag (name, type)
1299 register struct binding_level *b;
1301 /* Find the proper binding level for this type tag. */
1303 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1308 /* Record the identifier as the type's name if it has none. */
1310 if (TYPE_NAME (type) == 0)
1311 TYPE_NAME (type) = name;
1314 if (b == global_binding_level)
1315 b->tags = perm_tree_cons (name, type, b->tags);
1317 b->tags = saveable_tree_cons (name, type, b->tags);
1319 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1320 tagged type we just added to the current binding level. This fake
1321 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1322 to output a representation of a tagged type, and it also gives
1323 us a convenient place to record the "scope start" address for the
1326 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1329 /* Handle when a new declaration NEWDECL
1330 has the same name as an old one OLDDECL
1331 in the same binding contour.
1332 Prints an error message if appropriate.
1334 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1335 Otherwise, return 0.
1337 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1338 and OLDDECL is in an outer binding level and should thus not be changed. */
1341 duplicate_decls (newdecl, olddecl, different_binding_level)
1342 register tree newdecl, olddecl;
1343 int different_binding_level;
1345 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1346 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1347 && DECL_INITIAL (newdecl) != 0);
1348 tree oldtype = TREE_TYPE (olddecl);
1349 tree newtype = TREE_TYPE (newdecl);
1352 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1353 DECL_MACHINE_ATTRIBUTES (newdecl) = DECL_MACHINE_ATTRIBUTES (olddecl);
1355 if (TREE_CODE (newtype) == ERROR_MARK
1356 || TREE_CODE (oldtype) == ERROR_MARK)
1359 /* New decl is completely inconsistent with the old one =>
1360 tell caller to replace the old one.
1361 This is always an error except in the case of shadowing a builtin. */
1362 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1364 if (TREE_CODE (olddecl) == FUNCTION_DECL
1365 && (DECL_BUILT_IN (olddecl)
1366 || DECL_BUILT_IN_NONANSI (olddecl)))
1368 /* If you declare a built-in or predefined function name as static,
1369 the old definition is overridden,
1370 but optionally warn this was a bad choice of name. */
1371 if (!TREE_PUBLIC (newdecl))
1375 else if (DECL_BUILT_IN (olddecl))
1376 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1378 warning_with_decl (newdecl, "shadowing library function `%s'");
1380 /* Likewise, if the built-in is not ansi, then programs can
1381 override it even globally without an error. */
1382 else if (! DECL_BUILT_IN (olddecl))
1383 warning_with_decl (newdecl,
1384 "library function `%s' declared as non-function");
1386 else if (DECL_BUILT_IN_NONANSI (olddecl))
1387 warning_with_decl (newdecl,
1388 "built-in function `%s' declared as non-function");
1390 warning_with_decl (newdecl,
1391 "built-in function `%s' declared as non-function");
1395 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1396 error_with_decl (olddecl, "previous declaration of `%s'");
1402 /* For real parm decl following a forward decl,
1403 return 1 so old decl will be reused. */
1404 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1405 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1408 /* The new declaration is the same kind of object as the old one.
1409 The declarations may partially match. Print warnings if they don't
1410 match enough. Ultimately, copy most of the information from the new
1411 decl to the old one, and keep using the old one. */
1413 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1414 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1415 && DECL_INITIAL (olddecl) == 0)
1416 /* If -traditional, avoid error for redeclaring fcn
1417 after implicit decl. */
1419 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1420 && DECL_BUILT_IN (olddecl))
1422 /* A function declaration for a built-in function. */
1423 if (!TREE_PUBLIC (newdecl))
1425 /* If you declare a built-in function name as static, the
1426 built-in definition is overridden,
1427 but optionally warn this was a bad choice of name. */
1429 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1430 /* Discard the old built-in function. */
1433 else if (!types_match)
1435 /* Accept the return type of the new declaration if same modes. */
1436 tree oldreturntype = TREE_TYPE (oldtype);
1437 tree newreturntype = TREE_TYPE (newtype);
1439 /* Make sure we put the new type in the same obstack as the old ones.
1440 If the old types are not both in the same obstack, use the
1442 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1443 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1446 push_obstacks_nochange ();
1447 end_temporary_allocation ();
1450 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1452 /* Function types may be shared, so we can't just modify
1453 the return type of olddecl's function type. */
1455 = build_function_type (newreturntype,
1456 TYPE_ARG_TYPES (oldtype));
1458 types_match = comptypes (newtype, trytype);
1462 /* Accept harmless mismatch in first argument type also.
1464 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1465 && TYPE_ARG_TYPES (oldtype) != 0
1466 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1467 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1468 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1469 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1471 /* Function types may be shared, so we can't just modify
1472 the return type of olddecl's function type. */
1474 = build_function_type (TREE_TYPE (oldtype),
1475 tree_cons (NULL_TREE,
1476 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1477 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1479 types_match = comptypes (newtype, trytype);
1483 if (! different_binding_level)
1484 TREE_TYPE (olddecl) = oldtype;
1490 /* If types don't match for a built-in, throw away the built-in. */
1491 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1495 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1496 && DECL_SOURCE_LINE (olddecl) == 0)
1498 /* A function declaration for a predeclared function
1499 that isn't actually built in. */
1500 if (!TREE_PUBLIC (newdecl))
1502 /* If you declare it as static, the
1503 default definition is overridden. */
1506 else if (!types_match)
1508 /* If the types don't match, preserve volatility indication.
1509 Later on, we will discard everything else about the
1510 default declaration. */
1511 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1514 /* Permit char *foo () to match void *foo (...) if not pedantic,
1515 if one of them came from a system header file. */
1516 else if (!types_match
1517 && TREE_CODE (olddecl) == FUNCTION_DECL
1518 && TREE_CODE (newdecl) == FUNCTION_DECL
1519 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1520 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1521 && (DECL_IN_SYSTEM_HEADER (olddecl)
1522 || DECL_IN_SYSTEM_HEADER (newdecl))
1523 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1524 && TYPE_ARG_TYPES (oldtype) == 0
1525 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1526 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1528 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1529 && TYPE_ARG_TYPES (newtype) == 0
1530 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1531 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1534 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1535 /* Make sure we keep void * as ret type, not char *. */
1536 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1537 TREE_TYPE (newdecl) = newtype = oldtype;
1539 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1540 we will come back here again. */
1541 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1543 else if (!types_match
1544 /* Permit char *foo (int, ...); followed by char *foo ();
1546 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1548 /* Return types must still match. */
1549 && comptypes (TREE_TYPE (oldtype),
1550 TREE_TYPE (newtype))
1551 && TYPE_ARG_TYPES (newtype) == 0))
1553 error_with_decl (newdecl, "conflicting types for `%s'");
1554 /* Check for function type mismatch
1555 involving an empty arglist vs a nonempty one. */
1556 if (TREE_CODE (olddecl) == FUNCTION_DECL
1557 && comptypes (TREE_TYPE (oldtype),
1558 TREE_TYPE (newtype))
1559 && ((TYPE_ARG_TYPES (oldtype) == 0
1560 && DECL_INITIAL (olddecl) == 0)
1562 (TYPE_ARG_TYPES (newtype) == 0
1563 && DECL_INITIAL (newdecl) == 0)))
1565 /* Classify the problem further. */
1566 register tree t = TYPE_ARG_TYPES (oldtype);
1568 t = TYPE_ARG_TYPES (newtype);
1569 for (; t; t = TREE_CHAIN (t))
1571 register tree type = TREE_VALUE (t);
1573 if (TREE_CHAIN (t) == 0
1574 && TYPE_MAIN_VARIANT (type) != void_type_node)
1576 error ("A parameter list with an ellipsis can't match");
1577 error ("an empty parameter name list declaration.");
1581 if (TYPE_MAIN_VARIANT (type) == float_type_node
1582 || C_PROMOTING_INTEGER_TYPE_P (type))
1584 error ("An argument type that has a default promotion");
1585 error ("can't match an empty parameter name list declaration.");
1590 error_with_decl (olddecl, "previous declaration of `%s'");
1594 errmsg = redeclaration_error_message (newdecl, olddecl);
1597 error_with_decl (newdecl, errmsg);
1598 error_with_decl (olddecl,
1599 ((DECL_INITIAL (olddecl)
1600 && current_binding_level == global_binding_level)
1601 ? "`%s' previously defined here"
1602 : "`%s' previously declared here"));
1604 else if (TREE_CODE (newdecl) == TYPE_DECL
1605 && (DECL_IN_SYSTEM_HEADER (olddecl)
1606 || DECL_IN_SYSTEM_HEADER (newdecl)))
1608 warning_with_decl (newdecl, "redefinition of `%s'");
1611 ((DECL_INITIAL (olddecl)
1612 && current_binding_level == global_binding_level)
1613 ? "`%s' previously defined here"
1614 : "`%s' previously declared here"));
1616 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1617 && DECL_INITIAL (olddecl) != 0
1618 && TYPE_ARG_TYPES (oldtype) == 0
1619 && TYPE_ARG_TYPES (newtype) != 0
1620 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1622 register tree type, parm;
1624 /* Prototype decl follows defn w/o prototype. */
1626 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1627 type = TYPE_ARG_TYPES (newtype),
1629 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1630 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1631 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1633 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1634 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1636 errmsg = "prototype for `%s' follows and number of arguments";
1639 /* Type for passing arg must be consistent
1640 with that declared for the arg. */
1641 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1642 /* If -traditional, allow `unsigned int' instead of `int'
1643 in the prototype. */
1644 && (! (flag_traditional
1645 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1646 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1648 errmsg = "prototype for `%s' follows and argument %d";
1654 error_with_decl (newdecl, errmsg, nargs);
1655 error_with_decl (olddecl,
1656 "doesn't match non-prototype definition here");
1660 warning_with_decl (newdecl, "prototype for `%s' follows");
1661 warning_with_decl (olddecl, "non-prototype definition here");
1664 /* Warn about mismatches in various flags. */
1667 /* Warn if function is now inline
1668 but was previously declared not inline and has been called. */
1669 if (TREE_CODE (olddecl) == FUNCTION_DECL
1670 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1671 && TREE_USED (olddecl))
1672 warning_with_decl (newdecl,
1673 "`%s' declared inline after being called");
1674 if (TREE_CODE (olddecl) == FUNCTION_DECL
1675 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1676 && DECL_INITIAL (olddecl) != 0)
1677 warning_with_decl (newdecl,
1678 "`%s' declared inline after its definition");
1680 /* If pedantic, warn when static declaration follows a non-static
1681 declaration. Otherwise, do so only for functions. */
1682 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1683 && TREE_PUBLIC (olddecl)
1684 && !TREE_PUBLIC (newdecl))
1685 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1687 /* Warn when const declaration follows a non-const
1688 declaration, but not for functions. */
1689 if (TREE_CODE (olddecl) != FUNCTION_DECL
1690 && !TREE_READONLY (olddecl)
1691 && TREE_READONLY (newdecl))
1692 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1693 /* These bits are logically part of the type, for variables.
1694 But not for functions
1695 (where qualifiers are not valid ANSI anyway). */
1696 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1697 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1698 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1699 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1703 /* Optionally warn about more than one declaration for the same name. */
1704 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1705 /* Dont warn about a function declaration
1706 followed by a definition. */
1707 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1708 && DECL_INITIAL (olddecl) == 0)
1709 /* Don't warn about extern decl followed by (tentative) definition. */
1710 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1712 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1713 warning_with_decl (olddecl, "previous declaration of `%s'");
1716 /* Copy all the DECL_... slots specified in the new decl
1717 except for any that we copy here from the old type.
1719 Past this point, we don't change OLDTYPE and NEWTYPE
1720 even if we change the types of NEWDECL and OLDDECL. */
1724 /* When copying info to olddecl, we store into write_olddecl
1725 instead. This allows us to avoid modifying olddecl when
1726 different_binding_level is true. */
1727 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1729 /* Make sure we put the new type in the same obstack as the old ones.
1730 If the old types are not both in the same obstack, use the permanent
1732 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1733 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1736 push_obstacks_nochange ();
1737 end_temporary_allocation ();
1740 /* Merge the data types specified in the two decls. */
1741 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1743 if (different_binding_level)
1745 = build_type_attribute_variant
1747 merge_attributes (TYPE_ATTRIBUTES (newtype),
1748 TYPE_ATTRIBUTES (oldtype)));
1751 = TREE_TYPE (olddecl)
1752 = common_type (newtype, oldtype);
1755 /* Lay the type out, unless already done. */
1756 if (oldtype != TREE_TYPE (newdecl))
1758 if (TREE_TYPE (newdecl) != error_mark_node)
1759 layout_type (TREE_TYPE (newdecl));
1760 if (TREE_CODE (newdecl) != FUNCTION_DECL
1761 && TREE_CODE (newdecl) != TYPE_DECL
1762 && TREE_CODE (newdecl) != CONST_DECL)
1763 layout_decl (newdecl, 0);
1767 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1768 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1769 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1770 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1771 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1774 /* Keep the old rtl since we can safely use it. */
1775 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1777 /* Merge the type qualifiers. */
1778 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1779 && !TREE_THIS_VOLATILE (newdecl))
1780 TREE_THIS_VOLATILE (write_olddecl) = 0;
1781 if (TREE_READONLY (newdecl))
1782 TREE_READONLY (write_olddecl) = 1;
1783 if (TREE_THIS_VOLATILE (newdecl))
1785 TREE_THIS_VOLATILE (write_olddecl) = 1;
1786 if (TREE_CODE (newdecl) == VAR_DECL)
1787 make_var_volatile (newdecl);
1790 /* Keep source location of definition rather than declaration. */
1791 /* When called with different_binding_level set, keep the old
1792 information so that meaningful diagnostics can be given. */
1793 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1794 && ! different_binding_level)
1796 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1797 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1800 /* Merge the unused-warning information. */
1801 if (DECL_IN_SYSTEM_HEADER (olddecl))
1802 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1803 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1804 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1806 /* Merge the initialization information. */
1807 /* When called with different_binding_level set, don't copy over
1808 DECL_INITIAL, so that we don't accidentally change function
1809 declarations into function definitions. */
1810 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1811 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1813 /* Merge the section attribute.
1814 We want to issue an error if the sections conflict but that must be
1815 done later in decl_attributes since we are called before attributes
1817 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1818 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1820 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1822 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1823 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1828 /* If cannot merge, then use the new type and qualifiers,
1829 and don't preserve the old rtl. */
1830 else if (! different_binding_level)
1832 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1833 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1834 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1835 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1838 /* Merge the storage class information. */
1839 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1840 /* For functions, static overrides non-static. */
1841 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1844 /* This is since we don't automatically
1845 copy the attributes of NEWDECL into OLDDECL. */
1846 /* No need to worry about different_binding_level here because
1847 then TREE_PUBLIC (newdecl) was true. */
1848 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1849 /* If this clears `static', clear it in the identifier too. */
1850 if (! TREE_PUBLIC (olddecl))
1851 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1853 if (DECL_EXTERNAL (newdecl))
1855 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1856 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1857 /* An extern decl does not override previous storage class. */
1858 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1859 if (! DECL_EXTERNAL (newdecl))
1860 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1864 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1865 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1868 /* If either decl says `inline', this fn is inline,
1869 unless its definition was passed already. */
1870 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1871 DECL_INLINE (olddecl) = 1;
1872 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1874 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1876 if (DECL_BUILT_IN (olddecl))
1878 /* Get rid of any built-in function if new arg types don't match it
1879 or if we have a function definition. */
1880 if (! types_match || new_is_definition)
1882 if (! different_binding_level)
1884 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1885 DECL_BUILT_IN (olddecl) = 0;
1890 /* If redeclaring a builtin function, and not a definition,
1891 it stays built in. */
1892 DECL_BUILT_IN (newdecl) = 1;
1893 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1896 /* Also preserve various other info from the definition. */
1897 else if (! new_is_definition)
1898 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1899 if (! new_is_definition)
1901 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1902 /* When called with different_binding_level set, don't copy over
1903 DECL_INITIAL, so that we don't accidentally change function
1904 declarations into function definitions. */
1905 if (! different_binding_level)
1906 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1907 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1908 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1911 if (different_binding_level)
1913 /* Don't output a duplicate symbol for this declaration. */
1914 TREE_ASM_WRITTEN (newdecl) = 1;
1918 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1919 But preserve OLDdECL's DECL_UID. */
1921 register unsigned olddecl_uid = DECL_UID (olddecl);
1923 bcopy ((char *) newdecl + sizeof (struct tree_common),
1924 (char *) olddecl + sizeof (struct tree_common),
1925 sizeof (struct tree_decl) - sizeof (struct tree_common));
1926 DECL_UID (olddecl) = olddecl_uid;
1932 /* Record a decl-node X as belonging to the current lexical scope.
1933 Check for errors (such as an incompatible declaration for the same
1934 name already seen in the same scope).
1936 Returns either X or an old decl for the same name.
1937 If an old decl is returned, it may have been smashed
1938 to agree with what X says. */
1945 register tree name = DECL_NAME (x);
1946 register struct binding_level *b = current_binding_level;
1948 DECL_CONTEXT (x) = current_function_decl;
1949 /* A local extern declaration for a function doesn't constitute nesting.
1950 A local auto declaration does, since it's a forward decl
1951 for a nested function coming later. */
1952 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1953 && DECL_EXTERNAL (x))
1954 DECL_CONTEXT (x) = 0;
1956 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1957 && x != IDENTIFIER_IMPLICIT_DECL (name)
1958 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1959 && !DECL_IN_SYSTEM_HEADER (x))
1960 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1966 int different_binding_level = 0;
1968 t = lookup_name_current_level (name);
1969 /* Don't type check externs here when -traditional. This is so that
1970 code with conflicting declarations inside blocks will get warnings
1971 not errors. X11 for instance depends on this. */
1972 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
1974 t = IDENTIFIER_GLOBAL_VALUE (name);
1975 /* Type decls at global scope don't conflict with externs declared
1976 inside lexical blocks. */
1977 if (t && TREE_CODE (t) == TYPE_DECL)
1979 different_binding_level = 1;
1981 if (t != 0 && t == error_mark_node)
1982 /* error_mark_node is 0 for a while during initialization! */
1985 error_with_decl (x, "`%s' used prior to declaration");
1990 file = DECL_SOURCE_FILE (t);
1991 line = DECL_SOURCE_LINE (t);
1994 /* If this decl is `static' and an implicit decl was seen previously,
1995 warn. But don't complain if -traditional,
1996 since traditional compilers don't complain. */
1997 if (! flag_traditional && TREE_PUBLIC (name)
1998 /* Don't test for DECL_EXTERNAL, because grokdeclarator
1999 sets this for all functions. */
2000 && ! TREE_PUBLIC (x)
2001 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2002 /* We used to warn also for explicit extern followed by static,
2003 but sometimes you need to do it that way. */
2004 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2006 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2007 IDENTIFIER_POINTER (name));
2008 pedwarn_with_file_and_line
2009 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2010 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2011 "previous declaration of `%s'",
2012 IDENTIFIER_POINTER (name));
2015 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2017 if (TREE_CODE (t) == PARM_DECL)
2019 /* Don't allow more than one "real" duplicate
2020 of a forward parm decl. */
2021 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2027 /* If we are processing a typedef statement, generate a whole new
2028 ..._TYPE node (which will be just an variant of the existing
2029 ..._TYPE node with identical properties) and then install the
2030 TYPE_DECL node generated to represent the typedef name as the
2031 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2033 The whole point here is to end up with a situation where each
2034 and every ..._TYPE node the compiler creates will be uniquely
2035 associated with AT MOST one node representing a typedef name.
2036 This way, even though the compiler substitutes corresponding
2037 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2038 early on, later parts of the compiler can always do the reverse
2039 translation and get back the corresponding typedef name. For
2042 typedef struct S MY_TYPE;
2045 Later parts of the compiler might only know that `object' was of
2046 type `struct S' if if were not for code just below. With this
2047 code however, later parts of the compiler see something like:
2049 struct S' == struct S
2050 typedef struct S' MY_TYPE;
2053 And they can then deduce (from the node for type struct S') that
2054 the original object declaration was:
2058 Being able to do this is important for proper support of protoize,
2059 and also for generating precise symbolic debugging information
2060 which takes full account of the programmer's (typedef) vocabulary.
2062 Obviously, we don't want to generate a duplicate ..._TYPE node if
2063 the TYPE_DECL node that we are now processing really represents a
2064 standard built-in type.
2066 Since all standard types are effectively declared at line zero
2067 in the source file, we can easily check to see if we are working
2068 on a standard type by checking the current value of lineno. */
2070 if (TREE_CODE (x) == TYPE_DECL)
2072 if (DECL_SOURCE_LINE (x) == 0)
2074 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2075 TYPE_NAME (TREE_TYPE (x)) = x;
2077 else if (TREE_TYPE (x) != error_mark_node)
2079 tree tt = TREE_TYPE (x);
2080 DECL_ORIGINAL_TYPE (x) = tt;
2081 tt = build_type_copy (tt);
2087 /* Multiple external decls of the same identifier ought to match.
2088 Check against both global declarations (when traditional) and out of
2089 scope (limbo) block level declarations.
2091 We get warnings about inline functions where they are defined.
2092 Avoid duplicate warnings where they are used. */
2093 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2097 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2098 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2099 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2100 decl = IDENTIFIER_GLOBAL_VALUE (name);
2101 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2102 /* Decls in limbo are always extern, so no need to check that. */
2103 decl = IDENTIFIER_LIMBO_VALUE (name);
2107 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2108 /* If old decl is built-in, we already warned if we should. */
2109 && !DECL_BUILT_IN (decl))
2111 pedwarn_with_decl (x,
2112 "type mismatch with previous external decl");
2113 pedwarn_with_decl (decl, "previous external decl of `%s'");
2117 /* If a function has had an implicit declaration, and then is defined,
2118 make sure they are compatible. */
2120 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2121 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2122 && TREE_CODE (x) == FUNCTION_DECL
2123 && ! comptypes (TREE_TYPE (x),
2124 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2126 warning_with_decl (x, "type mismatch with previous implicit declaration");
2127 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2128 "previous implicit declaration of `%s'");
2131 /* In PCC-compatibility mode, extern decls of vars with no current decl
2132 take effect at top level no matter where they are. */
2133 if (flag_traditional && DECL_EXTERNAL (x)
2134 && lookup_name (name) == 0)
2136 tree type = TREE_TYPE (x);
2138 /* But don't do this if the type contains temporary nodes. */
2141 if (type == error_mark_node)
2143 if (! TREE_PERMANENT (type))
2145 warning_with_decl (x, "type of external `%s' is not global");
2146 /* By exiting the loop early, we leave TYPE nonzero,
2147 and thus prevent globalization of the decl. */
2150 else if (TREE_CODE (type) == FUNCTION_TYPE
2151 && TYPE_ARG_TYPES (type) != 0)
2152 /* The types might not be truly local,
2153 but the list of arg types certainly is temporary.
2154 Since prototypes are nontraditional,
2155 ok not to do the traditional thing. */
2157 type = TREE_TYPE (type);
2161 b = global_binding_level;
2164 /* This name is new in its binding level.
2165 Install the new declaration and return it. */
2166 if (b == global_binding_level)
2168 /* Install a global value. */
2170 /* If the first global decl has external linkage,
2171 warn if we later see static one. */
2172 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2173 TREE_PUBLIC (name) = 1;
2175 IDENTIFIER_GLOBAL_VALUE (name) = x;
2177 /* We no longer care about any previous block level declarations. */
2178 IDENTIFIER_LIMBO_VALUE (name) = 0;
2180 /* Don't forget if the function was used via an implicit decl. */
2181 if (IDENTIFIER_IMPLICIT_DECL (name)
2182 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2183 TREE_USED (x) = 1, TREE_USED (name) = 1;
2185 /* Don't forget if its address was taken in that way. */
2186 if (IDENTIFIER_IMPLICIT_DECL (name)
2187 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2188 TREE_ADDRESSABLE (x) = 1;
2190 /* Warn about mismatches against previous implicit decl. */
2191 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2192 /* If this real decl matches the implicit, don't complain. */
2193 && ! (TREE_CODE (x) == FUNCTION_DECL
2194 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2195 == integer_type_node)))
2196 pedwarn ("`%s' was previously implicitly declared to return `int'",
2197 IDENTIFIER_POINTER (name));
2199 /* If this decl is `static' and an `extern' was seen previously,
2200 that is erroneous. */
2201 if (TREE_PUBLIC (name)
2202 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2204 /* Okay to redeclare an ANSI built-in as static. */
2205 if (t != 0 && DECL_BUILT_IN (t))
2207 /* Okay to declare a non-ANSI built-in as anything. */
2208 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2210 /* Okay to have global type decl after an earlier extern
2211 declaration inside a lexical block. */
2212 else if (TREE_CODE (x) == TYPE_DECL)
2214 else if (IDENTIFIER_IMPLICIT_DECL (name))
2215 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2216 IDENTIFIER_POINTER (name));
2218 pedwarn ("`%s' was declared `extern' and later `static'",
2219 IDENTIFIER_POINTER (name));
2224 /* Here to install a non-global value. */
2225 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2226 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2227 IDENTIFIER_LOCAL_VALUE (name) = x;
2229 /* If this is an extern function declaration, see if we
2230 have a global definition or declaration for the function. */
2232 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2234 && TREE_CODE (x) == FUNCTION_DECL
2235 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2237 /* We have one. Their types must agree. */
2238 if (! comptypes (TREE_TYPE (x),
2239 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2240 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2243 /* Inner extern decl is inline if global one is.
2244 Copy enough to really inline it. */
2245 if (DECL_INLINE (oldglobal))
2247 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2248 DECL_INITIAL (x) = (current_function_decl == oldglobal
2249 ? 0 : DECL_INITIAL (oldglobal));
2250 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2251 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2252 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2253 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2254 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2255 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2257 /* Inner extern decl is built-in if global one is. */
2258 if (DECL_BUILT_IN (oldglobal))
2260 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2261 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2263 /* Keep the arg types from a file-scope fcn defn. */
2264 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2265 && DECL_INITIAL (oldglobal)
2266 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2267 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2271 #if 0 /* This case is probably sometimes the right thing to do. */
2272 /* If we have a local external declaration,
2273 then any file-scope declaration should not
2274 have been static. */
2275 if (oldlocal == 0 && oldglobal != 0
2276 && !TREE_PUBLIC (oldglobal)
2277 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2278 warning ("`%s' locally external but globally static",
2279 IDENTIFIER_POINTER (name));
2282 /* If we have a local external declaration,
2283 and no file-scope declaration has yet been seen,
2284 then if we later have a file-scope decl it must not be static. */
2286 && DECL_EXTERNAL (x)
2290 TREE_PUBLIC (name) = 1;
2292 /* Save this decl, so that we can do type checking against
2293 other decls after it falls out of scope.
2295 Only save it once. This prevents temporary decls created in
2296 expand_inline_function from being used here, since this
2297 will have been set when the inline function was parsed.
2298 It also helps give slightly better warnings. */
2299 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2300 IDENTIFIER_LIMBO_VALUE (name) = x;
2303 /* Warn if shadowing an argument at the top level of the body. */
2304 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2305 /* This warning doesn't apply to the parms of a nested fcn. */
2306 && ! current_binding_level->parm_flag
2307 /* Check that this is one level down from the parms. */
2308 && current_binding_level->level_chain->parm_flag
2309 /* Check that the decl being shadowed
2310 comes from the parm level, one level up. */
2311 && chain_member (oldlocal, current_binding_level->level_chain->names))
2313 if (TREE_CODE (oldlocal) == PARM_DECL)
2314 pedwarn ("declaration of `%s' shadows a parameter",
2315 IDENTIFIER_POINTER (name));
2317 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2318 IDENTIFIER_POINTER (name));
2321 /* Maybe warn if shadowing something else. */
2322 else if (warn_shadow && !DECL_EXTERNAL (x)
2323 /* No shadow warnings for internally generated vars. */
2324 && DECL_SOURCE_LINE (x) != 0
2325 /* No shadow warnings for vars made for inlining. */
2326 && ! DECL_FROM_INLINE (x))
2328 char *warnstring = 0;
2330 if (TREE_CODE (x) == PARM_DECL
2331 && current_binding_level->level_chain->parm_flag)
2332 /* Don't warn about the parm names in function declarator
2333 within a function declarator.
2334 It would be nice to avoid warning in any function
2335 declarator in a declaration, as opposed to a definition,
2336 but there is no way to tell it's not a definition. */
2338 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2339 warnstring = "declaration of `%s' shadows a parameter";
2340 else if (oldlocal != 0)
2341 warnstring = "declaration of `%s' shadows previous local";
2342 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2343 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2344 warnstring = "declaration of `%s' shadows global declaration";
2347 warning (warnstring, IDENTIFIER_POINTER (name));
2350 /* If storing a local value, there may already be one (inherited).
2351 If so, record it for restoration when this binding level ends. */
2353 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2356 /* Keep count of variables in this level with incomplete type. */
2357 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2361 /* Put decls on list in reverse order.
2362 We will reverse them later if necessary. */
2363 TREE_CHAIN (x) = b->names;
2369 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2372 pushdecl_top_level (x)
2376 register struct binding_level *b = current_binding_level;
2378 current_binding_level = global_binding_level;
2380 current_binding_level = b;
2384 /* Generate an implicit declaration for identifier FUNCTIONID
2385 as a function of type int (). Print a warning if appropriate. */
2388 implicitly_declare (functionid)
2392 int traditional_warning = 0;
2393 /* Only one "implicit declaration" warning per identifier. */
2394 int implicit_warning;
2396 /* Save the decl permanently so we can warn if definition follows. */
2397 push_obstacks_nochange ();
2398 end_temporary_allocation ();
2400 /* We used to reuse an old implicit decl here,
2401 but this loses with inline functions because it can clobber
2402 the saved decl chains. */
2403 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2404 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2406 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2408 /* Warn of implicit decl following explicit local extern decl.
2409 This is probably a program designed for traditional C. */
2410 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2411 traditional_warning = 1;
2413 /* Warn once of an implicit declaration. */
2414 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2416 DECL_EXTERNAL (decl) = 1;
2417 TREE_PUBLIC (decl) = 1;
2419 /* Record that we have an implicit decl and this is it. */
2420 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2422 /* ANSI standard says implicit declarations are in the innermost block.
2423 So we record the decl in the standard fashion.
2424 If flag_traditional is set, pushdecl does it top-level. */
2427 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2428 maybe_objc_check_decl (decl);
2430 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2432 if (warn_implicit && implicit_warning)
2433 warning ("implicit declaration of function `%s'",
2434 IDENTIFIER_POINTER (functionid));
2435 else if (warn_traditional && traditional_warning)
2436 warning ("function `%s' was previously declared within a block",
2437 IDENTIFIER_POINTER (functionid));
2439 /* Write a record describing this implicit function declaration to the
2440 prototypes file (if requested). */
2442 gen_aux_info_record (decl, 0, 1, 0);
2449 /* Return zero if the declaration NEWDECL is valid
2450 when the declaration OLDDECL (assumed to be for the same name)
2451 has already been seen.
2452 Otherwise return an error message format string with a %s
2453 where the identifier should go. */
2456 redeclaration_error_message (newdecl, olddecl)
2457 tree newdecl, olddecl;
2459 if (TREE_CODE (newdecl) == TYPE_DECL)
2461 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2463 /* pushdecl creates distinct types for TYPE_DECLs by calling
2464 build_type_copy, so the above comparison generally fails. We do
2465 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2466 is equivalent to what this code used to do before the build_type_copy
2467 call. The variant type distinction should not matter for traditional
2468 code, because it doesn't have type qualifiers. */
2469 if (flag_traditional
2470 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2472 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2474 return "redefinition of `%s'";
2476 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2478 /* Declarations of functions can insist on internal linkage
2479 but they can't be inconsistent with internal linkage,
2480 so there can be no error on that account.
2481 However defining the same name twice is no good. */
2482 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2483 /* However, defining once as extern inline and a second
2484 time in another way is ok. */
2485 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2486 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2487 return "redefinition of `%s'";
2490 else if (current_binding_level == global_binding_level)
2492 /* Objects declared at top level: */
2493 /* If at least one is a reference, it's ok. */
2494 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2496 /* Reject two definitions. */
2497 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2498 return "redefinition of `%s'";
2499 /* Now we have two tentative defs, or one tentative and one real def. */
2500 /* Insist that the linkage match. */
2501 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2502 return "conflicting declarations of `%s'";
2505 else if (current_binding_level->parm_flag
2506 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2510 /* Newdecl has block scope. If olddecl has block scope also, then
2511 reject two definitions, and reject a definition together with an
2512 external reference. Otherwise, it is OK, because newdecl must
2513 be an extern reference to olddecl. */
2514 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2515 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2516 return "redeclaration of `%s'";
2521 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2522 Create one if none exists so far for the current function.
2523 This function is called for both label definitions and label references. */
2529 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2531 if (current_function_decl == 0)
2533 error ("label %s referenced outside of any function",
2534 IDENTIFIER_POINTER (id));
2538 /* Use a label already defined or ref'd with this name. */
2541 /* But not if it is inherited and wasn't declared to be inheritable. */
2542 if (DECL_CONTEXT (decl) != current_function_decl
2543 && ! C_DECLARED_LABEL_FLAG (decl))
2544 return shadow_label (id);
2548 decl = build_decl (LABEL_DECL, id, void_type_node);
2550 /* Make sure every label has an rtx. */
2553 /* A label not explicitly declared must be local to where it's ref'd. */
2554 DECL_CONTEXT (decl) = current_function_decl;
2556 DECL_MODE (decl) = VOIDmode;
2558 /* Say where one reference is to the label,
2559 for the sake of the error if it is not defined. */
2560 DECL_SOURCE_LINE (decl) = lineno;
2561 DECL_SOURCE_FILE (decl) = input_filename;
2563 IDENTIFIER_LABEL_VALUE (id) = decl;
2565 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2570 /* Make a label named NAME in the current function,
2571 shadowing silently any that may be inherited from containing functions
2572 or containing scopes.
2574 Note that valid use, if the label being shadowed
2575 comes from another scope in the same function,
2576 requires calling declare_nonlocal_label right away. */
2582 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2588 /* Check to make sure that the label hasn't already been declared
2589 at this label scope */
2590 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2591 if (TREE_VALUE (dup) == decl)
2593 error ("duplicate label declaration `%s'",
2594 IDENTIFIER_POINTER (name));
2595 error_with_decl (TREE_VALUE (dup),
2596 "this is a previous declaration");
2597 /* Just use the previous declaration. */
2598 return lookup_label (name);
2601 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2602 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2605 return lookup_label (name);
2608 /* Define a label, specifying the location in the source file.
2609 Return the LABEL_DECL node for the label, if the definition is valid.
2610 Otherwise return 0. */
2613 define_label (filename, line, name)
2618 tree decl = lookup_label (name);
2620 /* If label with this name is known from an outer context, shadow it. */
2621 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2623 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2624 IDENTIFIER_LABEL_VALUE (name) = 0;
2625 decl = lookup_label (name);
2628 if (DECL_INITIAL (decl) != 0)
2630 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2635 /* Mark label as having been defined. */
2636 DECL_INITIAL (decl) = error_mark_node;
2637 /* Say where in the source. */
2638 DECL_SOURCE_FILE (decl) = filename;
2639 DECL_SOURCE_LINE (decl) = line;
2644 /* Return the list of declarations of the current level.
2645 Note that this list is in reverse order unless/until
2646 you nreverse it; and when you do nreverse it, you must
2647 store the result back using `storedecls' or you will lose. */
2652 return current_binding_level->names;
2655 /* Return the list of type-tags (for structs, etc) of the current level. */
2660 return current_binding_level->tags;
2663 /* Store the list of declarations of the current level.
2664 This is done for the parameter declarations of a function being defined,
2665 after they are modified in the light of any missing parameters. */
2671 current_binding_level->names = decls;
2674 /* Similarly, store the list of tags of the current level. */
2680 current_binding_level->tags = tags;
2683 /* Given NAME, an IDENTIFIER_NODE,
2684 return the structure (or union or enum) definition for that name.
2685 Searches binding levels from BINDING_LEVEL up to the global level.
2686 If THISLEVEL_ONLY is nonzero, searches only the specified context
2687 (but skips any tag-transparent contexts to find one that is
2688 meaningful for tags).
2689 CODE says which kind of type the caller wants;
2690 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2691 If the wrong kind of type is found, an error is reported. */
2694 lookup_tag (code, name, binding_level, thislevel_only)
2695 enum tree_code code;
2696 struct binding_level *binding_level;
2700 register struct binding_level *level;
2702 for (level = binding_level; level; level = level->level_chain)
2705 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2707 if (TREE_PURPOSE (tail) == name)
2709 if (TREE_CODE (TREE_VALUE (tail)) != code)
2711 /* Definition isn't the kind we were looking for. */
2712 pending_invalid_xref = name;
2713 pending_invalid_xref_file = input_filename;
2714 pending_invalid_xref_line = lineno;
2716 return TREE_VALUE (tail);
2719 if (thislevel_only && ! level->tag_transparent)
2725 /* Print an error message now
2726 for a recent invalid struct, union or enum cross reference.
2727 We don't print them immediately because they are not invalid
2728 when used in the `struct foo;' construct for shadowing. */
2731 pending_xref_error ()
2733 if (pending_invalid_xref != 0)
2734 error_with_file_and_line (pending_invalid_xref_file,
2735 pending_invalid_xref_line,
2736 "`%s' defined as wrong kind of tag",
2737 IDENTIFIER_POINTER (pending_invalid_xref));
2738 pending_invalid_xref = 0;
2741 /* Given a type, find the tag that was defined for it and return the tag name.
2742 Otherwise return 0. */
2745 lookup_tag_reverse (type)
2748 register struct binding_level *level;
2750 for (level = current_binding_level; level; level = level->level_chain)
2753 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2755 if (TREE_VALUE (tail) == type)
2756 return TREE_PURPOSE (tail);
2762 /* Look up NAME in the current binding level and its superiors
2763 in the namespace of variables, functions and typedefs.
2764 Return a ..._DECL node of some kind representing its definition,
2765 or return 0 if it is undefined. */
2772 if (current_binding_level != global_binding_level
2773 && IDENTIFIER_LOCAL_VALUE (name))
2774 val = IDENTIFIER_LOCAL_VALUE (name);
2776 val = IDENTIFIER_GLOBAL_VALUE (name);
2780 /* Similar to `lookup_name' but look only at current binding level. */
2783 lookup_name_current_level (name)
2788 if (current_binding_level == global_binding_level)
2789 return IDENTIFIER_GLOBAL_VALUE (name);
2791 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2794 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2795 if (DECL_NAME (t) == name)
2801 /* Create the predefined scalar types of C,
2802 and some nodes representing standard constants (0, 1, (void *) 0).
2803 Initialize the global binding level.
2804 Make definitions for built-in primitive functions. */
2807 init_decl_processing ()
2809 register tree endlink;
2810 /* Either char* or void*. */
2811 tree traditional_ptr_type_node;
2812 /* Data types of memcpy and strlen. */
2813 tree memcpy_ftype, memset_ftype, strlen_ftype;
2814 tree void_ftype_any;
2815 int wchar_type_size;
2817 tree array_domain_type;
2819 current_function_decl = NULL;
2820 named_labels = NULL;
2821 current_binding_level = NULL_BINDING_LEVEL;
2822 free_binding_level = NULL_BINDING_LEVEL;
2823 pushlevel (0); /* make the binding_level structure for global names */
2824 global_binding_level = current_binding_level;
2826 /* Define `int' and `char' first so that dbx will output them first. */
2828 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2829 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2830 integer_type_node));
2832 /* Define `char', which is like either `signed char' or `unsigned char'
2833 but not the same as either. */
2837 ? make_signed_type (CHAR_TYPE_SIZE)
2838 : make_unsigned_type (CHAR_TYPE_SIZE));
2839 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2842 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2843 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2844 long_integer_type_node));
2846 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2847 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2848 unsigned_type_node));
2850 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2851 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2852 long_unsigned_type_node));
2854 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2855 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2856 long_long_integer_type_node));
2858 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2859 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2860 long_long_unsigned_type_node));
2862 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2863 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2864 short_integer_type_node));
2866 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2867 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2868 short_unsigned_type_node));
2870 /* `unsigned long' is the standard type for sizeof.
2871 Traditionally, use a signed type.
2872 Note that stddef.h uses `unsigned long',
2873 and this must agree, even of long and int are the same size. */
2875 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2876 if (flag_traditional && TREE_UNSIGNED (sizetype))
2877 sizetype = signed_type (sizetype);
2880 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2882 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2883 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2884 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2885 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2886 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2887 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2888 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2889 TREE_TYPE (TYPE_SIZE (short_integer_type_node)) = sizetype;
2890 TREE_TYPE (TYPE_SIZE (short_unsigned_type_node)) = sizetype;
2892 error_mark_node = make_node (ERROR_MARK);
2893 TREE_TYPE (error_mark_node) = error_mark_node;
2895 /* Define both `signed char' and `unsigned char'. */
2896 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2897 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2898 signed_char_type_node));
2900 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2901 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2902 unsigned_char_type_node));
2904 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2905 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2907 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2908 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2910 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2911 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2913 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2914 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2916 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2917 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2919 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2920 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2922 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2923 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2925 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2926 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2928 float_type_node = make_node (REAL_TYPE);
2929 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2930 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2932 layout_type (float_type_node);
2934 double_type_node = make_node (REAL_TYPE);
2935 if (flag_short_double)
2936 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2938 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2939 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2941 layout_type (double_type_node);
2943 long_double_type_node = make_node (REAL_TYPE);
2944 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2945 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2946 long_double_type_node));
2947 layout_type (long_double_type_node);
2949 complex_integer_type_node = make_node (COMPLEX_TYPE);
2950 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2951 complex_integer_type_node));
2952 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2953 layout_type (complex_integer_type_node);
2955 complex_float_type_node = make_node (COMPLEX_TYPE);
2956 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2957 complex_float_type_node));
2958 TREE_TYPE (complex_float_type_node) = float_type_node;
2959 layout_type (complex_float_type_node);
2961 complex_double_type_node = make_node (COMPLEX_TYPE);
2962 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2963 complex_double_type_node));
2964 TREE_TYPE (complex_double_type_node) = double_type_node;
2965 layout_type (complex_double_type_node);
2967 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2968 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2969 complex_long_double_type_node));
2970 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2971 layout_type (complex_long_double_type_node);
2974 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2975 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2976 signed_wchar_type_node = signed_type (wchar_type_node);
2977 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2979 integer_zero_node = build_int_2 (0, 0);
2980 TREE_TYPE (integer_zero_node) = integer_type_node;
2981 integer_one_node = build_int_2 (1, 0);
2982 TREE_TYPE (integer_one_node) = integer_type_node;
2984 boolean_type_node = integer_type_node;
2985 boolean_true_node = integer_one_node;
2986 boolean_false_node = integer_zero_node;
2988 size_zero_node = build_int_2 (0, 0);
2989 TREE_TYPE (size_zero_node) = sizetype;
2990 size_one_node = build_int_2 (1, 0);
2991 TREE_TYPE (size_one_node) = sizetype;
2993 void_type_node = make_node (VOID_TYPE);
2994 pushdecl (build_decl (TYPE_DECL,
2995 ridpointers[(int) RID_VOID], void_type_node));
2996 layout_type (void_type_node); /* Uses integer_zero_node */
2997 /* We are not going to have real types in C with less than byte alignment,
2998 so we might as well not have any types that claim to have it. */
2999 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3001 null_pointer_node = build_int_2 (0, 0);
3002 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3003 layout_type (TREE_TYPE (null_pointer_node));
3005 string_type_node = build_pointer_type (char_type_node);
3006 const_string_type_node
3007 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3009 /* Make a type to be the domain of a few array types
3010 whose domains don't really matter.
3011 200 is small enough that it always fits in size_t
3012 and large enough that it can hold most function names for the
3013 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3014 array_domain_type = build_index_type (build_int_2 (200, 0));
3016 /* make a type for arrays of characters.
3017 With luck nothing will ever really depend on the length of this
3019 char_array_type_node
3020 = build_array_type (char_type_node, array_domain_type);
3021 /* Likewise for arrays of ints. */
3023 = build_array_type (integer_type_node, array_domain_type);
3024 /* This is for wide string constants. */
3025 wchar_array_type_node
3026 = build_array_type (wchar_type_node, array_domain_type);
3028 default_function_type
3029 = build_function_type (integer_type_node, NULL_TREE);
3031 ptr_type_node = build_pointer_type (void_type_node);
3033 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3035 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3038 = build_function_type (void_type_node, NULL_TREE);
3041 = build_function_type (float_type_node,
3042 tree_cons (NULL_TREE, float_type_node, endlink));
3045 = build_function_type (double_type_node,
3046 tree_cons (NULL_TREE, double_type_node, endlink));
3048 ldouble_ftype_ldouble
3049 = build_function_type (long_double_type_node,
3050 tree_cons (NULL_TREE, long_double_type_node,
3053 double_ftype_double_double
3054 = build_function_type (double_type_node,
3055 tree_cons (NULL_TREE, double_type_node,
3056 tree_cons (NULL_TREE,
3057 double_type_node, endlink)));
3060 = build_function_type (integer_type_node,
3061 tree_cons (NULL_TREE, integer_type_node, endlink));
3064 = build_function_type (long_integer_type_node,
3065 tree_cons (NULL_TREE,
3066 long_integer_type_node, endlink));
3068 void_ftype_ptr_ptr_int
3069 = build_function_type (void_type_node,
3070 tree_cons (NULL_TREE, ptr_type_node,
3071 tree_cons (NULL_TREE, ptr_type_node,
3072 tree_cons (NULL_TREE,
3076 int_ftype_cptr_cptr_sizet
3077 = build_function_type (integer_type_node,
3078 tree_cons (NULL_TREE, const_ptr_type_node,
3079 tree_cons (NULL_TREE, const_ptr_type_node,
3080 tree_cons (NULL_TREE,
3084 void_ftype_ptr_int_int
3085 = build_function_type (void_type_node,
3086 tree_cons (NULL_TREE, ptr_type_node,
3087 tree_cons (NULL_TREE, integer_type_node,
3088 tree_cons (NULL_TREE,
3092 string_ftype_ptr_ptr /* strcpy prototype */
3093 = build_function_type (string_type_node,
3094 tree_cons (NULL_TREE, string_type_node,
3095 tree_cons (NULL_TREE,
3096 const_string_type_node,
3099 int_ftype_string_string /* strcmp prototype */
3100 = build_function_type (integer_type_node,
3101 tree_cons (NULL_TREE, const_string_type_node,
3102 tree_cons (NULL_TREE,
3103 const_string_type_node,
3106 strlen_ftype /* strlen prototype */
3107 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3108 tree_cons (NULL_TREE, const_string_type_node,
3111 traditional_ptr_type_node
3112 = (flag_traditional ? string_type_node : ptr_type_node);
3114 memcpy_ftype /* memcpy prototype */
3115 = build_function_type (traditional_ptr_type_node,
3116 tree_cons (NULL_TREE, ptr_type_node,
3117 tree_cons (NULL_TREE, const_ptr_type_node,
3118 tree_cons (NULL_TREE,
3122 memset_ftype /* memset prototype */
3123 = build_function_type (traditional_ptr_type_node,
3124 tree_cons (NULL_TREE, ptr_type_node,
3125 tree_cons (NULL_TREE, integer_type_node,
3126 tree_cons (NULL_TREE,
3130 builtin_function ("__builtin_constant_p", default_function_type,
3131 BUILT_IN_CONSTANT_P, NULL_PTR);
3133 builtin_function ("__builtin_return_address",
3134 build_function_type (ptr_type_node,
3135 tree_cons (NULL_TREE,
3138 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3140 builtin_function ("__builtin_frame_address",
3141 build_function_type (ptr_type_node,
3142 tree_cons (NULL_TREE,
3145 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3147 builtin_function ("__builtin_alloca",
3148 build_function_type (ptr_type_node,
3149 tree_cons (NULL_TREE,
3152 BUILT_IN_ALLOCA, "alloca");
3153 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3154 /* Define alloca, ffs as builtins.
3155 Declare _exit just to mark it as volatile. */
3156 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3158 temp = builtin_function ("alloca",
3159 build_function_type (ptr_type_node,
3160 tree_cons (NULL_TREE,
3163 BUILT_IN_ALLOCA, NULL_PTR);
3164 /* Suppress error if redefined as a non-function. */
3165 DECL_BUILT_IN_NONANSI (temp) = 1;
3166 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3167 /* Suppress error if redefined as a non-function. */
3168 DECL_BUILT_IN_NONANSI (temp) = 1;
3169 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3171 TREE_THIS_VOLATILE (temp) = 1;
3172 TREE_SIDE_EFFECTS (temp) = 1;
3173 /* Suppress error if redefined as a non-function. */
3174 DECL_BUILT_IN_NONANSI (temp) = 1;
3177 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3178 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3180 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3182 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3184 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3186 builtin_function ("__builtin_saveregs",
3187 build_function_type (ptr_type_node, NULL_TREE),
3188 BUILT_IN_SAVEREGS, NULL_PTR);
3189 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3191 builtin_function ("__builtin_varargs",
3192 build_function_type (ptr_type_node,
3193 tree_cons (NULL_TREE,
3196 BUILT_IN_VARARGS, NULL_PTR);
3198 builtin_function ("__builtin_classify_type", default_function_type,
3199 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3200 builtin_function ("__builtin_next_arg",
3201 build_function_type (ptr_type_node, NULL_TREE),
3202 BUILT_IN_NEXT_ARG, NULL_PTR);
3203 builtin_function ("__builtin_args_info",
3204 build_function_type (integer_type_node,
3205 tree_cons (NULL_TREE,
3208 BUILT_IN_ARGS_INFO, NULL_PTR);
3210 /* Untyped call and return. */
3211 builtin_function ("__builtin_apply_args",
3212 build_function_type (ptr_type_node, NULL_TREE),
3213 BUILT_IN_APPLY_ARGS, NULL_PTR);
3215 temp = tree_cons (NULL_TREE,
3216 build_pointer_type (build_function_type (void_type_node,
3218 tree_cons (NULL_TREE,
3220 tree_cons (NULL_TREE,
3223 builtin_function ("__builtin_apply",
3224 build_function_type (ptr_type_node, temp),
3225 BUILT_IN_APPLY, NULL_PTR);
3226 builtin_function ("__builtin_return",
3227 build_function_type (void_type_node,
3228 tree_cons (NULL_TREE,
3231 BUILT_IN_RETURN, NULL_PTR);
3233 /* Currently under experimentation. */
3234 builtin_function ("__builtin_memcpy", memcpy_ftype,
3235 BUILT_IN_MEMCPY, "memcpy");
3236 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3237 BUILT_IN_MEMCMP, "memcmp");
3238 builtin_function ("__builtin_memset", memset_ftype,
3239 BUILT_IN_MEMSET, NULL_PTR);
3240 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3241 BUILT_IN_STRCMP, "strcmp");
3242 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3243 BUILT_IN_STRCPY, "strcpy");
3244 builtin_function ("__builtin_strlen", strlen_ftype,
3245 BUILT_IN_STRLEN, "strlen");
3246 builtin_function ("__builtin_sqrtf", float_ftype_float,
3247 BUILT_IN_FSQRT, "sqrtf");
3248 builtin_function ("__builtin_fsqrt", double_ftype_double,
3249 BUILT_IN_FSQRT, "sqrt");
3250 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3251 BUILT_IN_FSQRT, "sqrtl");
3252 builtin_function ("__builtin_sinf", float_ftype_float,
3253 BUILT_IN_SIN, "sinf");
3254 builtin_function ("__builtin_sin", double_ftype_double,
3255 BUILT_IN_SIN, "sin");
3256 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3257 BUILT_IN_SIN, "sinl");
3258 builtin_function ("__builtin_cosf", float_ftype_float,
3259 BUILT_IN_COS, "cosf");
3260 builtin_function ("__builtin_cos", double_ftype_double,
3261 BUILT_IN_COS, "cos");
3262 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3263 BUILT_IN_COS, "cosl");
3264 builtin_function ("__builtin_setjmp",
3265 build_function_type (integer_type_node,
3266 tree_cons (NULL_TREE,
3267 ptr_type_node, endlink)),
3268 BUILT_IN_SETJMP, NULL_PTR);
3269 builtin_function ("__builtin_longjmp",
3272 tree_cons (NULL, ptr_type_node,
3273 tree_cons (NULL_TREE,
3276 BUILT_IN_LONGJMP, NULL_PTR);
3278 /* In an ANSI C program, it is okay to supply built-in meanings
3279 for these functions, since applications cannot validly use them
3280 with any other meaning.
3281 However, honor the -fno-builtin option. */
3282 if (!flag_no_builtin)
3284 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3285 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3286 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3287 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3289 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3290 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3291 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3293 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3294 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3296 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3298 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3299 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3300 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3301 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3303 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3304 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3305 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3306 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3307 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3308 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3310 /* Declare these functions volatile
3311 to avoid spurious "control drops through" warnings. */
3312 /* Don't specify the argument types, to avoid errors
3313 from certain code which isn't valid in ANSI but which exists. */
3314 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3316 TREE_THIS_VOLATILE (temp) = 1;
3317 TREE_SIDE_EFFECTS (temp) = 1;
3318 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3319 TREE_THIS_VOLATILE (temp) = 1;
3320 TREE_SIDE_EFFECTS (temp) = 1;
3324 /* Support for these has not been written in either expand_builtin
3325 or build_function_call. */
3326 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3327 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3328 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3330 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3332 builtin_function ("__builtin_fmod", double_ftype_double_double,
3333 BUILT_IN_FMOD, NULL_PTR);
3334 builtin_function ("__builtin_frem", double_ftype_double_double,
3335 BUILT_IN_FREM, NULL_PTR);
3336 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3337 BUILT_IN_MEMSET, NULL_PTR);
3338 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3340 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3344 pedantic_lvalues = pedantic;
3346 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3347 declare_function_name ();
3349 start_identifier_warnings ();
3351 /* Prepare to check format strings against argument lists. */
3352 init_function_format_info ();
3356 incomplete_decl_finalize_hook = finish_incomplete_decl;
3359 /* Return a definition for a builtin function named NAME and whose data type
3360 is TYPE. TYPE should be a function type with argument types.
3361 FUNCTION_CODE tells later passes how to compile calls to this function.
3362 See tree.h for its possible values.
3364 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3365 the name to be called if we can't opencode the function. */
3368 builtin_function (name, type, function_code, library_name)
3371 enum built_in_function function_code;
3374 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3375 DECL_EXTERNAL (decl) = 1;
3376 TREE_PUBLIC (decl) = 1;
3377 /* If -traditional, permit redefining a builtin function any way you like.
3378 (Though really, if the program redefines these functions,
3379 it probably won't work right unless compiled with -fno-builtin.) */
3380 if (flag_traditional && name[0] != '_')
3381 DECL_BUILT_IN_NONANSI (decl) = 1;
3383 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3384 make_decl_rtl (decl, NULL_PTR, 1);
3386 if (function_code != NOT_BUILT_IN)
3388 DECL_BUILT_IN (decl) = 1;
3389 DECL_FUNCTION_CODE (decl) = function_code;
3391 /* Warn if a function in the namespace for users
3392 is used without an occasion to consider it declared. */
3393 if (name[0] != '_' || name[1] != '_')
3394 C_DECL_ANTICIPATED (decl) = 1;
3399 /* Called when a declaration is seen that contains no names to declare.
3400 If its type is a reference to a structure, union or enum inherited
3401 from a containing scope, shadow that tag name for the current scope
3402 with a forward reference.
3403 If its type defines a new named structure or union
3404 or defines an enum, it is valid but we need not do anything here.
3405 Otherwise, it is an error. */
3408 shadow_tag (declspecs)
3411 shadow_tag_warned (declspecs, 0);
3415 shadow_tag_warned (declspecs, warned)
3418 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3424 pending_invalid_xref = 0;
3426 for (link = declspecs; link; link = TREE_CHAIN (link))
3428 register tree value = TREE_VALUE (link);
3429 register enum tree_code code = TREE_CODE (value);
3431 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3432 /* Used to test also that TYPE_SIZE (value) != 0.
3433 That caused warning for `struct foo;' at top level in the file. */
3435 register tree name = lookup_tag_reverse (value);
3442 if (warned != 1 && code != ENUMERAL_TYPE)
3443 /* Empty unnamed enum OK */
3445 pedwarn ("unnamed struct/union that defines no instances");
3451 t = lookup_tag (code, name, current_binding_level, 1);
3455 t = make_node (code);
3462 if (!warned && ! in_system_header)
3464 warning ("useless keyword or type name in empty declaration");
3471 error ("two types specified in one empty declaration");
3476 pedwarn ("empty declaration");
3480 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3483 groktypename (typename)
3486 if (TREE_CODE (typename) != TREE_LIST)
3488 return grokdeclarator (TREE_VALUE (typename),
3489 TREE_PURPOSE (typename),
3493 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3496 groktypename_in_parm_context (typename)
3499 if (TREE_CODE (typename) != TREE_LIST)
3501 return grokdeclarator (TREE_VALUE (typename),
3502 TREE_PURPOSE (typename),
3506 /* Decode a declarator in an ordinary declaration or data definition.
3507 This is called as soon as the type information and variable name
3508 have been parsed, before parsing the initializer if any.
3509 Here we create the ..._DECL node, fill in its type,
3510 and put it on the list of decls for the current context.
3511 The ..._DECL node is returned as the value.
3513 Exception: for arrays where the length is not specified,
3514 the type is left null, to be filled in by `finish_decl'.
3516 Function definitions do not come here; they go to start_function
3517 instead. However, external and forward declarations of functions
3518 do go through here. Structure field declarations are done by
3519 grokfield and not through here. */
3521 /* Set this to zero to debug not using the temporary obstack
3522 to parse initializers. */
3523 int debug_temp_inits = 1;
3526 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3527 tree declarator, declspecs;
3529 tree attributes, prefix_attributes;
3531 register tree decl = grokdeclarator (declarator, declspecs,
3532 NORMAL, initialized);
3534 int init_written = initialized;
3536 /* The corresponding pop_obstacks is in finish_decl. */
3537 push_obstacks_nochange ();
3540 /* Is it valid for this decl to have an initializer at all?
3541 If not, set INITIALIZED to zero, which will indirectly
3542 tell `finish_decl' to ignore the initializer once it is parsed. */
3543 switch (TREE_CODE (decl))
3546 /* typedef foo = bar means give foo the same type as bar.
3547 We haven't parsed bar yet, so `finish_decl' will fix that up.
3548 Any other case of an initialization in a TYPE_DECL is an error. */
3549 if (pedantic || list_length (declspecs) > 1)
3551 error ("typedef `%s' is initialized",
3552 IDENTIFIER_POINTER (DECL_NAME (decl)));
3558 error ("function `%s' is initialized like a variable",
3559 IDENTIFIER_POINTER (DECL_NAME (decl)));
3564 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3565 error ("parameter `%s' is initialized",
3566 IDENTIFIER_POINTER (DECL_NAME (decl)));
3571 /* Don't allow initializations for incomplete types
3572 except for arrays which might be completed by the initialization. */
3573 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3575 /* A complete type is ok if size is fixed. */
3577 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3578 || C_DECL_VARIABLE_SIZE (decl))
3580 error ("variable-sized object may not be initialized");
3584 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3586 error ("variable `%s' has initializer but incomplete type",
3587 IDENTIFIER_POINTER (DECL_NAME (decl)));
3590 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3592 error ("elements of array `%s' have incomplete type",
3593 IDENTIFIER_POINTER (DECL_NAME (decl)));
3600 #if 0 /* Seems redundant with grokdeclarator. */
3601 if (current_binding_level != global_binding_level
3602 && DECL_EXTERNAL (decl)
3603 && TREE_CODE (decl) != FUNCTION_DECL)
3604 warning ("declaration of `%s' has `extern' and is initialized",
3605 IDENTIFIER_POINTER (DECL_NAME (decl)));
3607 DECL_EXTERNAL (decl) = 0;
3608 if (current_binding_level == global_binding_level)
3609 TREE_STATIC (decl) = 1;
3611 /* Tell `pushdecl' this is an initialized decl
3612 even though we don't yet have the initializer expression.
3613 Also tell `finish_decl' it may store the real initializer. */
3614 DECL_INITIAL (decl) = error_mark_node;
3617 /* If this is a function declaration, write a record describing it to the
3618 prototypes file (if requested). */
3620 if (TREE_CODE (decl) == FUNCTION_DECL)
3621 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3623 /* ANSI specifies that a tentative definition which is not merged with
3624 a non-tentative definition behaves exactly like a definition with an
3625 initializer equal to zero. (Section 3.7.2)
3626 -fno-common gives strict ANSI behavior. Usually you don't want it.
3627 This matters only for variables with external linkage. */
3628 if (! flag_no_common || ! TREE_PUBLIC (decl))
3629 DECL_COMMON (decl) = 1;
3631 /* Set attributes here so if duplicate decl, will have proper attributes. */
3632 decl_attributes (decl, attributes, prefix_attributes);
3634 /* Add this decl to the current binding level.
3635 TEM may equal DECL or it may be a previous decl of the same name. */
3636 tem = pushdecl (decl);
3638 /* For a local variable, define the RTL now. */
3639 if (current_binding_level != global_binding_level
3640 /* But not if this is a duplicate decl
3641 and we preserved the rtl from the previous one
3642 (which may or may not happen). */
3643 && DECL_RTL (tem) == 0)
3645 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3647 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3648 && DECL_INITIAL (tem) != 0)
3654 /* When parsing and digesting the initializer,
3655 use temporary storage. Do this even if we will ignore the value. */
3656 if (current_binding_level == global_binding_level && debug_temp_inits)
3657 temporary_allocation ();
3663 /* Finish processing of a declaration;
3664 install its initial value.
3665 If the length of an array type is not known before,
3666 it must be determined now, from the initial value, or it is an error. */
3669 finish_decl (decl, init, asmspec_tree)
3673 register tree type = TREE_TYPE (decl);
3674 int was_incomplete = (DECL_SIZE (decl) == 0);
3675 int temporary = allocation_temporary_p ();
3678 /* If a name was specified, get the string. */
3680 asmspec = TREE_STRING_POINTER (asmspec_tree);
3682 /* If `start_decl' didn't like having an initialization, ignore it now. */
3684 if (init != 0 && DECL_INITIAL (decl) == 0)
3686 /* Don't crash if parm is initialized. */
3687 if (TREE_CODE (decl) == PARM_DECL)
3690 if (ITERATOR_P (decl))
3693 error_with_decl (decl, "iterator has no initial value");
3695 init = save_expr (init);
3700 if (TREE_CODE (decl) != TYPE_DECL)
3701 store_init_value (decl, init);
3704 /* typedef foo = bar; store the type of bar as the type of foo. */
3705 TREE_TYPE (decl) = TREE_TYPE (init);
3706 DECL_INITIAL (decl) = init = 0;
3710 /* Pop back to the obstack that is current for this binding level.
3711 This is because MAXINDEX, rtl, etc. to be made below
3712 must go in the permanent obstack. But don't discard the
3713 temporary data yet. */
3715 #if 0 /* pop_obstacks was near the end; this is what was here. */
3716 if (current_binding_level == global_binding_level && temporary)
3717 end_temporary_allocation ();
3720 /* Deduce size of array from initialization, if not already known */
3722 if (TREE_CODE (type) == ARRAY_TYPE
3723 && TYPE_DOMAIN (type) == 0
3724 && TREE_CODE (decl) != TYPE_DECL)
3727 = (TREE_STATIC (decl)
3728 /* Even if pedantic, an external linkage array
3729 may have incomplete type at first. */
3730 ? pedantic && !TREE_PUBLIC (decl)
3731 : !DECL_EXTERNAL (decl));
3733 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3735 /* Get the completed type made by complete_array_type. */
3736 type = TREE_TYPE (decl);
3739 error_with_decl (decl, "initializer fails to determine size of `%s'");
3744 error_with_decl (decl, "array size missing in `%s'");
3745 /* If a `static' var's size isn't known,
3746 make it extern as well as static, so it does not get
3748 If it is not `static', then do not mark extern;
3749 finish_incomplete_decl will give it a default size
3750 and it will get allocated. */
3751 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3752 DECL_EXTERNAL (decl) = 1;
3755 /* TYPE_MAX_VALUE is always one less than the number of elements
3756 in the array, because we start counting at zero. Therefore,
3757 warn only if the value is less than zero. */
3758 if (pedantic && TYPE_DOMAIN (type) != 0
3759 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3760 error_with_decl (decl, "zero or negative size array `%s'");
3762 layout_decl (decl, 0);
3765 if (TREE_CODE (decl) == VAR_DECL)
3767 if (DECL_SIZE (decl) == 0
3768 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3769 layout_decl (decl, 0);
3771 if (DECL_SIZE (decl) == 0
3772 && (TREE_STATIC (decl)
3774 /* A static variable with an incomplete type
3775 is an error if it is initialized.
3776 Also if it is not file scope.
3777 Otherwise, let it through, but if it is not `extern'
3778 then it may cause an error message later. */
3779 /* A duplicate_decls call could have changed an extern
3780 declaration into a file scope one. This can be detected
3781 by TREE_ASM_WRITTEN being set. */
3782 (DECL_INITIAL (decl) != 0
3783 || DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl))
3785 /* An automatic variable with an incomplete type
3787 !DECL_EXTERNAL (decl)))
3789 error_with_decl (decl, "storage size of `%s' isn't known");
3790 TREE_TYPE (decl) = error_mark_node;
3793 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3794 && DECL_SIZE (decl) != 0)
3796 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3797 constant_expression_warning (DECL_SIZE (decl));
3799 error_with_decl (decl, "storage size of `%s' isn't constant");
3803 /* If this is a function and an assembler name is specified, it isn't
3804 builtin any more. Also reset DECL_RTL so we can give it its new
3806 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3808 DECL_BUILT_IN (decl) = 0;
3809 DECL_RTL (decl) = 0;
3812 /* Output the assembler code and/or RTL code for variables and functions,
3813 unless the type is an undefined structure or union.
3814 If not, it will get done when the type is completed. */
3816 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3818 if ((flag_traditional || TREE_PERMANENT (decl))
3819 && allocation_temporary_p ())
3821 push_obstacks_nochange ();
3822 end_temporary_allocation ();
3823 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3824 maybe_objc_check_decl (decl);
3825 rest_of_decl_compilation (decl, asmspec,
3826 (DECL_CONTEXT (decl) == 0
3827 || TREE_ASM_WRITTEN (decl)),
3833 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3834 maybe_objc_check_decl (decl);
3835 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3838 if (DECL_CONTEXT (decl) != 0)
3840 /* Recompute the RTL of a local array now
3841 if it used to be an incomplete type. */
3843 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3845 /* If we used it already as memory, it must stay in memory. */
3846 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3847 /* If it's still incomplete now, no init will save it. */
3848 if (DECL_SIZE (decl) == 0)
3849 DECL_INITIAL (decl) = 0;
3852 /* Compute and store the initial value. */
3853 if (TREE_CODE (decl) != FUNCTION_DECL)
3854 expand_decl_init (decl);
3858 if (TREE_CODE (decl) == TYPE_DECL)
3860 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3861 maybe_objc_check_decl (decl);
3862 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3866 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3867 /* This test used to include TREE_PERMANENT, however, we have the same
3868 problem with initializers at the function level. Such initializers get
3869 saved until the end of the function on the momentary_obstack. */
3870 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3872 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3873 space with DECL_ARG_TYPE. */
3874 && TREE_CODE (decl) != PARM_DECL)
3876 /* We need to remember that this array HAD an initialization,
3877 but discard the actual temporary nodes,
3878 since we can't have a permanent node keep pointing to them. */
3879 /* We make an exception for inline functions, since it's
3880 normal for a local extern redeclaration of an inline function
3881 to have a copy of the top-level decl's DECL_INLINE. */
3882 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3884 /* If this is a const variable, then preserve the
3885 initializer instead of discarding it so that we can optimize
3886 references to it. */
3887 /* This test used to include TREE_STATIC, but this won't be set
3888 for function level initializers. */
3889 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3891 preserve_initializer ();
3892 /* Hack? Set the permanent bit for something that is permanent,
3893 but not on the permanent obstack, so as to convince
3894 output_constant_def to make its rtl on the permanent
3896 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3898 /* The initializer and DECL must have the same (or equivalent
3899 types), but if the initializer is a STRING_CST, its type
3900 might not be on the right obstack, so copy the type
3902 TREE_TYPE (DECL_INITIAL (decl)) = type;
3905 DECL_INITIAL (decl) = error_mark_node;
3909 /* If requested, warn about definitions of large data objects. */
3911 if (warn_larger_than
3912 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3913 && !DECL_EXTERNAL (decl))
3915 register tree decl_size = DECL_SIZE (decl);
3917 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3919 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3921 if (units > larger_than_size)
3922 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3927 /* Resume permanent allocation, if not within a function. */
3928 /* The corresponding push_obstacks_nochange is in start_decl,
3929 and in push_parm_decl and in grokfield. */
3933 /* If we have gone back from temporary to permanent allocation,
3934 actually free the temporary space that we no longer need. */
3935 if (temporary && !allocation_temporary_p ())
3936 permanent_allocation (0);
3938 /* At the end of a declaration, throw away any variable type sizes
3939 of types defined inside that declaration. There is no use
3940 computing them in the following function definition. */
3941 if (current_binding_level == global_binding_level)
3942 get_pending_sizes ();
3945 /* If DECL has a cleanup, build and return that cleanup here.
3946 This is a callback called by expand_expr. */
3949 maybe_build_cleanup (decl)
3952 /* There are no cleanups in C. */
3956 /* Given a parsed parameter declaration,
3957 decode it into a PARM_DECL and push that on the current binding level.
3958 Also, for the sake of forward parm decls,
3959 record the given order of parms in `parm_order'. */
3962 push_parm_decl (parm)
3966 int old_immediate_size_expand = immediate_size_expand;
3967 /* Don't try computing parm sizes now -- wait till fn is called. */
3968 immediate_size_expand = 0;
3970 /* The corresponding pop_obstacks is in finish_decl. */
3971 push_obstacks_nochange ();
3973 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3974 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3975 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3976 TREE_PURPOSE (TREE_VALUE (parm)));
3979 if (DECL_NAME (decl))
3982 olddecl = lookup_name (DECL_NAME (decl));
3983 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3984 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3988 decl = pushdecl (decl);
3990 immediate_size_expand = old_immediate_size_expand;
3992 current_binding_level->parm_order
3993 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3995 /* Add this decl to the current binding level. */
3996 finish_decl (decl, NULL_TREE, NULL_TREE);
3999 /* Clear the given order of parms in `parm_order'.
4000 Used at start of parm list,
4001 and also at semicolon terminating forward decls. */
4006 current_binding_level->parm_order = NULL_TREE;
4009 /* Make TYPE a complete type based on INITIAL_VALUE.
4010 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4011 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4014 complete_array_type (type, initial_value, do_default)
4019 register tree maxindex = NULL_TREE;
4024 /* Note MAXINDEX is really the maximum index,
4025 one less than the size. */
4026 if (TREE_CODE (initial_value) == STRING_CST)
4029 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4030 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4033 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4035 tree elts = CONSTRUCTOR_ELTS (initial_value);
4036 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4037 for (; elts; elts = TREE_CHAIN (elts))
4039 if (TREE_PURPOSE (elts))
4040 maxindex = TREE_PURPOSE (elts);
4042 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4044 maxindex = copy_node (maxindex);
4048 /* Make an error message unless that happened already. */
4049 if (initial_value != error_mark_node)
4052 /* Prevent further error messages. */
4053 maxindex = build_int_2 (0, 0);
4060 maxindex = build_int_2 (0, 0);
4066 TYPE_DOMAIN (type) = build_index_type (maxindex);
4067 if (!TREE_TYPE (maxindex))
4068 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4069 #if 0 /* I took out this change
4070 together with the change in build_array_type. --rms */
4071 change_main_variant (type,
4072 build_array_type (TREE_TYPE (type),
4073 TYPE_DOMAIN (type)));
4077 /* Lay out the type now that we can get the real answer. */
4084 /* Given declspecs and a declarator,
4085 determine the name and type of the object declared
4086 and construct a ..._DECL node for it.
4087 (In one case we can return a ..._TYPE node instead.
4088 For invalid input we sometimes return 0.)
4090 DECLSPECS is a chain of tree_list nodes whose value fields
4091 are the storage classes and type specifiers.
4093 DECL_CONTEXT says which syntactic context this declaration is in:
4094 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4095 FUNCDEF for a function definition. Like NORMAL but a few different
4096 error messages in each case. Return value may be zero meaning
4097 this definition is too screwy to try to parse.
4098 PARM for a parameter declaration (either within a function prototype
4099 or before a function body). Make a PARM_DECL, or return void_type_node.
4100 TYPENAME if for a typename (in a cast or sizeof).
4101 Don't make a DECL node; just return the ..._TYPE node.
4102 FIELD for a struct or union field; make a FIELD_DECL.
4103 BITFIELD for a field with specified width.
4104 INITIALIZED is 1 if the decl has an initializer.
4106 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4107 It may also be so in the PARM case, for a prototype where the
4108 argument type is specified but not the name.
4110 This function is where the complicated C meanings of `static'
4111 and `extern' are interpreted. */
4114 grokdeclarator (declarator, declspecs, decl_context, initialized)
4117 enum decl_context decl_context;
4122 tree type = NULL_TREE;
4127 int explicit_int = 0;
4128 int explicit_char = 0;
4129 int defaulted_int = 0;
4130 tree typedef_decl = 0;
4132 tree typedef_type = 0;
4133 int funcdef_flag = 0;
4134 enum tree_code innermost_code = ERROR_MARK;
4136 int size_varies = 0;
4137 tree decl_machine_attr = NULL_TREE;
4139 if (decl_context == BITFIELD)
4140 bitfield = 1, decl_context = FIELD;
4142 if (decl_context == FUNCDEF)
4143 funcdef_flag = 1, decl_context = NORMAL;
4145 push_obstacks_nochange ();
4147 if (flag_traditional && allocation_temporary_p ())
4148 end_temporary_allocation ();
4150 /* Look inside a declarator for the name being declared
4151 and get it as a string, for an error message. */
4153 register tree decl = declarator;
4157 switch (TREE_CODE (decl))
4162 innermost_code = TREE_CODE (decl);
4163 decl = TREE_OPERAND (decl, 0);
4166 case IDENTIFIER_NODE:
4167 name = IDENTIFIER_POINTER (decl);
4178 /* A function definition's declarator must have the form of
4179 a function declarator. */
4181 if (funcdef_flag && innermost_code != CALL_EXPR)
4184 /* Anything declared one level down from the top level
4185 must be one of the parameters of a function
4186 (because the body is at least two levels down). */
4188 /* If this looks like a function definition, make it one,
4189 even if it occurs where parms are expected.
4190 Then store_parm_decls will reject it and not use it as a parm. */
4191 if (decl_context == NORMAL && !funcdef_flag
4192 && current_binding_level->parm_flag)
4193 decl_context = PARM;
4195 /* Look through the decl specs and record which ones appear.
4196 Some typespecs are defined as built-in typenames.
4197 Others, the ones that are modifiers of other types,
4198 are represented by bits in SPECBITS: set the bits for
4199 the modifiers that appear. Storage class keywords are also in SPECBITS.
4201 If there is a typedef name or a type, store the type in TYPE.
4202 This includes builtin typedefs such as `int'.
4204 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4205 and did not come from a user typedef.
4207 Set LONGLONG if `long' is mentioned twice. */
4209 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4212 register tree id = TREE_VALUE (spec);
4214 if (id == ridpointers[(int) RID_INT])
4216 if (id == ridpointers[(int) RID_CHAR])
4219 if (TREE_CODE (id) == IDENTIFIER_NODE)
4220 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4222 if (ridpointers[i] == id)
4224 if (i == (int) RID_LONG && specbits & (1<<i))
4227 error ("`long long long' is too long for GCC");
4230 if (pedantic && ! in_system_header)
4231 pedwarn ("ANSI C does not support `long long'");
4235 else if (specbits & (1 << i))
4236 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4242 error ("two or more data types in declaration of `%s'", name);
4243 /* Actual typedefs come to us as TYPE_DECL nodes. */
4244 else if (TREE_CODE (id) == TYPE_DECL)
4246 type = TREE_TYPE (id);
4247 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4250 /* Built-in types come as identifiers. */
4251 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4253 register tree t = lookup_name (id);
4254 if (TREE_TYPE (t) == error_mark_node)
4256 else if (!t || TREE_CODE (t) != TYPE_DECL)
4257 error ("`%s' fails to be a typedef or built in type",
4258 IDENTIFIER_POINTER (id));
4261 type = TREE_TYPE (t);
4265 else if (TREE_CODE (id) != ERROR_MARK)
4271 typedef_type = type;
4273 size_varies = C_TYPE_VARIABLE_SIZE (type);
4275 /* No type at all: default to `int', and set DEFAULTED_INT
4276 because it was not a user-defined typedef. */
4280 if (funcdef_flag && warn_return_type
4281 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4282 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
4283 warn_about_return_type = 1;
4285 type = integer_type_node;
4288 /* Now process the modifiers that were specified
4289 and check for invalid combinations. */
4291 /* Long double is a special combination. */
4293 if ((specbits & 1 << (int) RID_LONG)
4294 && TYPE_MAIN_VARIANT (type) == double_type_node)
4296 specbits &= ~ (1 << (int) RID_LONG);
4297 type = long_double_type_node;
4300 /* Check all other uses of type modifiers. */
4302 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4303 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4307 if (TREE_CODE (type) != INTEGER_TYPE)
4308 error ("long, short, signed or unsigned invalid for `%s'", name);
4309 else if ((specbits & 1 << (int) RID_LONG)
4310 && (specbits & 1 << (int) RID_SHORT))
4311 error ("long and short specified together for `%s'", name);
4312 else if (((specbits & 1 << (int) RID_LONG)
4313 || (specbits & 1 << (int) RID_SHORT))
4315 error ("long or short specified with char for `%s'", name);
4316 else if (((specbits & 1 << (int) RID_LONG)
4317 || (specbits & 1 << (int) RID_SHORT))
4318 && TREE_CODE (type) == REAL_TYPE)
4319 error ("long or short specified with floating type for `%s'", name);
4320 else if ((specbits & 1 << (int) RID_SIGNED)
4321 && (specbits & 1 << (int) RID_UNSIGNED))
4322 error ("signed and unsigned given together for `%s'", name);
4326 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4328 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4330 if (flag_pedantic_errors)
4335 /* Discard the type modifiers if they are invalid. */
4338 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4339 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4344 if ((specbits & (1 << (int) RID_COMPLEX))
4345 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4347 error ("complex invalid for `%s'", name);
4348 specbits &= ~ (1 << (int) RID_COMPLEX);
4351 /* Decide whether an integer type is signed or not.
4352 Optionally treat bitfields as signed by default. */
4353 if (specbits & 1 << (int) RID_UNSIGNED
4354 /* Traditionally, all bitfields are unsigned. */
4355 || (bitfield && flag_traditional
4356 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4357 || (bitfield && ! flag_signed_bitfields
4358 && (explicit_int || defaulted_int || explicit_char
4359 /* A typedef for plain `int' without `signed'
4360 can be controlled just like plain `int'. */
4361 || ! (typedef_decl != 0
4362 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4363 && TREE_CODE (type) != ENUMERAL_TYPE
4364 && !(specbits & 1 << (int) RID_SIGNED)))
4367 type = long_long_unsigned_type_node;
4368 else if (specbits & 1 << (int) RID_LONG)
4369 type = long_unsigned_type_node;
4370 else if (specbits & 1 << (int) RID_SHORT)
4371 type = short_unsigned_type_node;
4372 else if (type == char_type_node)
4373 type = unsigned_char_type_node;
4374 else if (typedef_decl)
4375 type = unsigned_type (type);
4377 type = unsigned_type_node;
4379 else if ((specbits & 1 << (int) RID_SIGNED)
4380 && type == char_type_node)
4381 type = signed_char_type_node;
4383 type = long_long_integer_type_node;
4384 else if (specbits & 1 << (int) RID_LONG)
4385 type = long_integer_type_node;
4386 else if (specbits & 1 << (int) RID_SHORT)
4387 type = short_integer_type_node;
4389 if (specbits & 1 << (int) RID_COMPLEX)
4391 /* If we just have "complex", it is equivalent to
4392 "complex double", but if any modifiers at all are specified it is
4393 the complex form of TYPE. E.g, "complex short" is
4394 "complex short int". */
4396 if (defaulted_int && ! longlong
4397 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4398 | (1 << (int) RID_SIGNED)
4399 | (1 << (int) RID_UNSIGNED))))
4400 type = complex_double_type_node;
4401 else if (type == integer_type_node)
4402 type = complex_integer_type_node;
4403 else if (type == float_type_node)
4404 type = complex_float_type_node;
4405 else if (type == double_type_node)
4406 type = complex_double_type_node;
4407 else if (type == long_double_type_node)
4408 type = complex_long_double_type_node;
4410 type = build_complex_type (type);
4413 /* Set CONSTP if this declaration is `const', whether by
4414 explicit specification or via a typedef.
4415 Likewise for VOLATILEP. */
4417 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4418 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4419 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4421 pedwarn ("duplicate `const'");
4423 pedwarn ("duplicate `volatile'");
4424 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4425 type = TYPE_MAIN_VARIANT (type);
4427 /* Warn if two storage classes are given. Default to `auto'. */
4432 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4433 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4434 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4435 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4436 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4437 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4439 /* Warn about storage classes that are invalid for certain
4440 kinds of declarations (parameters, typenames, etc.). */
4443 error ("multiple storage classes in declaration of `%s'", name);
4444 else if (funcdef_flag
4446 & ((1 << (int) RID_REGISTER)
4447 | (1 << (int) RID_AUTO)
4448 | (1 << (int) RID_TYPEDEF))))
4450 if (specbits & 1 << (int) RID_AUTO
4451 && (pedantic || current_binding_level == global_binding_level))
4452 pedwarn ("function definition declared `auto'");
4453 if (specbits & 1 << (int) RID_REGISTER)
4454 error ("function definition declared `register'");
4455 if (specbits & 1 << (int) RID_TYPEDEF)
4456 error ("function definition declared `typedef'");
4457 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4458 | (1 << (int) RID_AUTO));
4460 else if (decl_context != NORMAL && nclasses > 0)
4462 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4466 error ((decl_context == FIELD
4467 ? "storage class specified for structure field `%s'"
4468 : (decl_context == PARM
4469 ? "storage class specified for parameter `%s'"
4470 : "storage class specified for typename")),
4472 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4473 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4474 | (1 << (int) RID_EXTERN));
4477 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4479 /* `extern' with initialization is invalid if not at top level. */
4480 if (current_binding_level == global_binding_level)
4481 warning ("`%s' initialized and declared `extern'", name);
4483 error ("`%s' has both `extern' and initializer", name);
4485 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4486 && current_binding_level != global_binding_level)
4487 error ("nested function `%s' declared `extern'", name);
4488 else if (current_binding_level == global_binding_level
4489 && specbits & (1 << (int) RID_AUTO))
4490 error ("top-level declaration of `%s' specifies `auto'", name);
4491 else if ((specbits & 1 << (int) RID_ITERATOR)
4492 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4494 error ("iterator `%s' has derived type", name);
4495 type = error_mark_node;
4497 else if ((specbits & 1 << (int) RID_ITERATOR)
4498 && TREE_CODE (type) != INTEGER_TYPE)
4500 error ("iterator `%s' has noninteger type", name);
4501 type = error_mark_node;
4505 /* Now figure out the structure of the declarator proper.
4506 Descend through it, creating more complex types, until we reach
4507 the declared identifier (or NULL_TREE, in an absolute declarator). */
4509 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4511 if (type == error_mark_node)
4513 declarator = TREE_OPERAND (declarator, 0);
4517 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4518 an INDIRECT_REF (for *...),
4519 a CALL_EXPR (for ...(...)),
4520 an identifier (for the name being declared)
4521 or a null pointer (for the place in an absolute declarator
4522 where the name was omitted).
4523 For the last two cases, we have just exited the loop.
4525 At this point, TYPE is the type of elements of an array,
4526 or for a function to return, or for a pointer to point to.
4527 After this sequence of ifs, TYPE is the type of the
4528 array or function or pointer, and DECLARATOR has had its
4529 outermost layer removed. */
4531 if (TREE_CODE (declarator) == ARRAY_REF)
4533 register tree itype = NULL_TREE;
4534 register tree size = TREE_OPERAND (declarator, 1);
4535 /* An uninitialized decl with `extern' is a reference. */
4536 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4537 /* The index is a signed object `sizetype' bits wide. */
4538 tree index_type = signed_type (sizetype);
4540 declarator = TREE_OPERAND (declarator, 0);
4542 /* Check for some types that there cannot be arrays of. */
4544 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4546 error ("declaration of `%s' as array of voids", name);
4547 type = error_mark_node;
4550 if (TREE_CODE (type) == FUNCTION_TYPE)
4552 error ("declaration of `%s' as array of functions", name);
4553 type = error_mark_node;
4556 if (size == error_mark_node)
4557 type = error_mark_node;
4559 if (type == error_mark_node)
4562 /* If this is a block level extern, it must live past the end
4563 of the function so that we can check it against other extern
4564 declarations (IDENTIFIER_LIMBO_VALUE). */
4565 if (extern_ref && allocation_temporary_p ())
4566 end_temporary_allocation ();
4568 /* If size was specified, set ITYPE to a range-type for that size.
4569 Otherwise, ITYPE remains null. finish_decl may figure it out
4570 from an initial value. */
4574 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4575 STRIP_TYPE_NOPS (size);
4577 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4578 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4580 error ("size of array `%s' has non-integer type", name);
4581 size = integer_one_node;
4584 if (pedantic && integer_zerop (size))
4585 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4587 if (TREE_CODE (size) == INTEGER_CST)
4589 constant_expression_warning (size);
4590 if (tree_int_cst_sgn (size) < 0)
4592 error ("size of array `%s' is negative", name);
4593 size = integer_one_node;
4598 /* Make sure the array size remains visibly nonconstant
4599 even if it is (eg) a const variable with known value. */
4604 if (TREE_CONSTANT (size))
4605 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4607 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4611 /* Convert size to index_type, so that if it is a variable
4612 the computations will be done in the proper mode. */
4613 itype = fold (build (MINUS_EXPR, index_type,
4614 convert (index_type, size),
4615 convert (index_type, size_one_node)));
4618 itype = variable_size (itype);
4619 itype = build_index_type (itype);
4622 #if 0 /* This had bad results for pointers to arrays, as in
4623 union incomplete (*foo)[4]; */
4624 /* Complain about arrays of incomplete types, except in typedefs. */
4626 if (TYPE_SIZE (type) == 0
4627 /* Avoid multiple warnings for nested array types. */
4628 && TREE_CODE (type) != ARRAY_TYPE
4629 && !(specbits & (1 << (int) RID_TYPEDEF))
4630 && !C_TYPE_BEING_DEFINED (type))
4631 warning ("array type has incomplete element type");
4634 #if 0 /* We shouldn't have a function type here at all!
4635 Functions aren't allowed as array elements. */
4636 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4637 && (constp || volatilep))
4638 pedwarn ("ANSI C forbids const or volatile function types");
4641 /* Build the array type itself, then merge any constancy or
4642 volatility into the target type. We must do it in this order
4643 to ensure that the TYPE_MAIN_VARIANT field of the array type
4644 is set correctly. */
4646 type = build_array_type (type, itype);
4647 if (constp || volatilep)
4648 type = c_build_type_variant (type, constp, volatilep);
4650 #if 0 /* don't clear these; leave them set so that the array type
4651 or the variable is itself const or volatile. */
4657 C_TYPE_VARIABLE_SIZE (type) = 1;
4659 else if (TREE_CODE (declarator) == CALL_EXPR)
4661 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4662 || current_binding_level == global_binding_level);
4665 /* Declaring a function type.
4666 Make sure we have a valid type for the function to return. */
4667 if (type == error_mark_node)
4672 /* Warn about some types functions can't return. */
4674 if (TREE_CODE (type) == FUNCTION_TYPE)
4676 error ("`%s' declared as function returning a function", name);
4677 type = integer_type_node;
4679 if (TREE_CODE (type) == ARRAY_TYPE)
4681 error ("`%s' declared as function returning an array", name);
4682 type = integer_type_node;
4685 #ifndef TRADITIONAL_RETURN_FLOAT
4686 /* Traditionally, declaring return type float means double. */
4688 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4689 type = double_type_node;
4690 #endif /* TRADITIONAL_RETURN_FLOAT */
4692 /* If this is a block level extern, it must live past the end
4693 of the function so that we can check it against other extern
4694 declarations (IDENTIFIER_LIMBO_VALUE). */
4695 if (extern_ref && allocation_temporary_p ())
4696 end_temporary_allocation ();
4698 /* Construct the function type and go to the next
4699 inner layer of declarator. */
4701 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4703 /* Say it's a definition
4704 only for the CALL_EXPR
4705 closest to the identifier. */
4706 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4707 #if 0 /* This seems to be false. We turn off temporary allocation
4708 above in this function if -traditional.
4709 And this code caused inconsistent results with prototypes:
4710 callers would ignore them, and pass arguments wrong. */
4712 /* Omit the arg types if -traditional, since the arg types
4713 and the list links might not be permanent. */
4714 type = build_function_type (type,
4716 ? NULL_TREE : arg_types);
4718 /* ANSI seems to say that `const int foo ();'
4719 does not make the function foo const. */
4720 if (constp || volatilep)
4721 type = c_build_type_variant (type, constp, volatilep);
4725 type = build_function_type (type, arg_types);
4726 declarator = TREE_OPERAND (declarator, 0);
4728 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4729 the formal parameter list of this FUNCTION_TYPE to point to
4730 the FUNCTION_TYPE node itself. */
4735 for (link = current_function_parm_tags;
4737 link = TREE_CHAIN (link))
4738 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4741 else if (TREE_CODE (declarator) == INDIRECT_REF)
4743 /* Merge any constancy or volatility into the target type
4746 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4747 && (constp || volatilep))
4748 pedwarn ("ANSI C forbids const or volatile function types");
4749 if (constp || volatilep)
4750 type = c_build_type_variant (type, constp, volatilep);
4755 type = build_pointer_type (type);
4757 /* Process a list of type modifier keywords
4758 (such as const or volatile) that were given inside the `*'. */
4760 if (TREE_TYPE (declarator))
4762 register tree typemodlist;
4764 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4765 typemodlist = TREE_CHAIN (typemodlist))
4767 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4769 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4774 error ("invalid type modifier within pointer declarator");
4778 pedwarn ("duplicate `const'");
4780 pedwarn ("duplicate `volatile'");
4783 declarator = TREE_OPERAND (declarator, 0);
4790 /* Now TYPE has the actual type. */
4792 /* If this is declaring a typedef name, return a TYPE_DECL. */
4794 if (specbits & (1 << (int) RID_TYPEDEF))
4797 /* Note that the grammar rejects storage classes
4798 in typenames, fields or parameters */
4799 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4800 && (constp || volatilep))
4801 pedwarn ("ANSI C forbids const or volatile function types");
4802 if (constp || volatilep)
4803 type = c_build_type_variant (type, constp, volatilep);
4804 decl = build_decl (TYPE_DECL, declarator, type);
4805 if ((specbits & (1 << (int) RID_SIGNED))
4806 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4807 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4812 /* Detect the case of an array type of unspecified size
4813 which came, as such, direct from a typedef name.
4814 We must copy the type, so that each identifier gets
4815 a distinct type, so that each identifier's size can be
4816 controlled separately by its own initializer. */
4818 if (type != 0 && typedef_type != 0
4819 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4820 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4822 type = build_array_type (TREE_TYPE (type), 0);
4824 C_TYPE_VARIABLE_SIZE (type) = 1;
4827 /* If this is a type name (such as, in a cast or sizeof),
4828 compute the type and return it now. */
4830 if (decl_context == TYPENAME)
4832 /* Note that the grammar rejects storage classes
4833 in typenames, fields or parameters */
4834 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4835 && (constp || volatilep))
4836 pedwarn ("ANSI C forbids const or volatile function types");
4837 if (constp || volatilep)
4838 type = c_build_type_variant (type, constp, volatilep);
4843 /* Aside from typedefs and type names (handle above),
4844 `void' at top level (not within pointer)
4845 is allowed only in public variables.
4846 We don't complain about parms either, but that is because
4847 a better error message can be made later. */
4849 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4850 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4851 && ((specbits & (1 << (int) RID_EXTERN))
4852 || (current_binding_level == global_binding_level
4854 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4856 error ("variable or field `%s' declared void", name);
4857 type = integer_type_node;
4860 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4861 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4866 if (decl_context == PARM)
4868 tree type_as_written = type;
4871 /* A parameter declared as an array of T is really a pointer to T.
4872 One declared as a function is really a pointer to a function. */
4874 if (TREE_CODE (type) == ARRAY_TYPE)
4876 /* Transfer const-ness of array into that of type pointed to. */
4877 type = TREE_TYPE (type);
4878 if (constp || volatilep)
4879 type = c_build_type_variant (type, constp, volatilep);
4880 type = build_pointer_type (type);
4881 volatilep = constp = 0;
4884 else if (TREE_CODE (type) == FUNCTION_TYPE)
4886 if (pedantic && (constp || volatilep))
4887 pedwarn ("ANSI C forbids const or volatile function types");
4888 if (constp || volatilep)
4889 type = c_build_type_variant (type, constp, volatilep);
4890 type = build_pointer_type (type);
4891 volatilep = constp = 0;
4894 decl = build_decl (PARM_DECL, declarator, type);
4896 C_DECL_VARIABLE_SIZE (decl) = 1;
4898 /* Compute the type actually passed in the parmlist,
4899 for the case where there is no prototype.
4900 (For example, shorts and chars are passed as ints.)
4901 When there is a prototype, this is overridden later. */
4903 DECL_ARG_TYPE (decl) = type;
4904 main_type = (type == error_mark_node
4906 : TYPE_MAIN_VARIANT (type));
4907 if (main_type == float_type_node)
4908 DECL_ARG_TYPE (decl) = double_type_node;
4909 /* Don't use TYPE_PRECISION to decide whether to promote,
4910 because we should convert short if it's the same size as int,
4911 but we should not convert long if it's the same size as int. */
4912 else if (TREE_CODE (main_type) != ERROR_MARK
4913 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4915 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4916 && TREE_UNSIGNED (type))
4917 DECL_ARG_TYPE (decl) = unsigned_type_node;
4919 DECL_ARG_TYPE (decl) = integer_type_node;
4922 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4924 else if (decl_context == FIELD)
4926 /* Structure field. It may not be a function. */
4928 if (TREE_CODE (type) == FUNCTION_TYPE)
4930 error ("field `%s' declared as a function", name);
4931 type = build_pointer_type (type);
4933 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4935 error ("field `%s' has incomplete type", name);
4936 type = error_mark_node;
4938 /* Move type qualifiers down to element of an array. */
4939 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4941 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4943 TYPE_DOMAIN (type));
4944 #if 0 /* Leave the field const or volatile as well. */
4945 constp = volatilep = 0;
4948 decl = build_decl (FIELD_DECL, declarator, type);
4950 C_DECL_VARIABLE_SIZE (decl) = 1;
4952 else if (TREE_CODE (type) == FUNCTION_TYPE)
4954 /* Every function declaration is "external"
4955 except for those which are inside a function body
4956 in which `auto' is used.
4957 That is a case not specified by ANSI C,
4958 and we use it for forward declarations for nested functions. */
4959 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4960 || current_binding_level == global_binding_level);
4962 if (specbits & (1 << (int) RID_AUTO)
4963 && (pedantic || current_binding_level == global_binding_level))
4964 pedwarn ("invalid storage class for function `%s'", name);
4965 if (specbits & (1 << (int) RID_REGISTER))
4966 error ("invalid storage class for function `%s'", name);
4967 /* Function declaration not at top level.
4968 Storage classes other than `extern' are not allowed
4969 and `extern' makes no difference. */
4970 if (current_binding_level != global_binding_level
4971 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4973 pedwarn ("invalid storage class for function `%s'", name);
4975 /* If this is a block level extern, it must live past the end
4976 of the function so that we can check it against other
4977 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4978 if (extern_ref && allocation_temporary_p ())
4979 end_temporary_allocation ();
4981 decl = build_decl (FUNCTION_DECL, declarator, type);
4982 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4984 if (pedantic && (constp || volatilep)
4985 && ! DECL_IN_SYSTEM_HEADER (decl))
4986 pedwarn ("ANSI C forbids const or volatile functions");
4989 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4990 warning ("`noreturn' function returns non-void value");
4993 DECL_EXTERNAL (decl) = 1;
4994 /* Record absence of global scope for `static' or `auto'. */
4996 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4998 /* Record presence of `inline', if it is reasonable. */
5001 tree last = tree_last (TYPE_ARG_TYPES (type));
5003 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5004 warning ("cannot inline function `main'");
5005 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
5007 warning ("inline declaration ignored for function with `...'");
5009 /* Assume that otherwise the function can be inlined. */
5010 DECL_INLINE (decl) = 1;
5012 if (specbits & (1 << (int) RID_EXTERN))
5013 current_extern_inline = 1;
5018 /* It's a variable. */
5019 /* An uninitialized decl with `extern' is a reference. */
5020 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5022 /* Move type qualifiers down to element of an array. */
5023 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5025 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5027 TYPE_DOMAIN (type));
5028 #if 0 /* Leave the variable const or volatile as well. */
5029 constp = volatilep = 0;
5033 /* If this is a block level extern, it must live past the end
5034 of the function so that we can check it against other
5035 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5036 if (extern_ref && allocation_temporary_p ())
5037 end_temporary_allocation ();
5039 decl = build_decl (VAR_DECL, declarator, type);
5041 C_DECL_VARIABLE_SIZE (decl) = 1;
5044 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5046 DECL_EXTERNAL (decl) = extern_ref;
5047 /* At top level, the presence of a `static' or `register' storage
5048 class specifier, or the absence of all storage class specifiers
5049 makes this declaration a definition (perhaps tentative). Also,
5050 the absence of both `static' and `register' makes it public. */
5051 if (current_binding_level == global_binding_level)
5055 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5056 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5058 /* Not at top level, only `static' makes a static definition. */
5061 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5062 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5065 if (specbits & 1 << (int) RID_ITERATOR)
5066 ITERATOR_P (decl) = 1;
5069 /* Record `register' declaration for warnings on &
5070 and in case doing stupid register allocation. */
5072 if (specbits & (1 << (int) RID_REGISTER))
5073 DECL_REGISTER (decl) = 1;
5075 /* Record constancy and volatility. */
5078 TREE_READONLY (decl) = 1;
5081 TREE_SIDE_EFFECTS (decl) = 1;
5082 TREE_THIS_VOLATILE (decl) = 1;
5084 /* If a type has volatile components, it should be stored in memory.
5085 Otherwise, the fact that those components are volatile
5086 will be ignored, and would even crash the compiler. */
5087 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5088 mark_addressable (decl);
5096 /* Decode the parameter-list info for a function type or function definition.
5097 The argument is the value returned by `get_parm_info' (or made in parse.y
5098 if there is an identifier list instead of a parameter decl list).
5099 These two functions are separate because when a function returns
5100 or receives functions then each is called multiple times but the order
5101 of calls is different. The last call to `grokparms' is always the one
5102 that contains the formal parameter names of a function definition.
5104 Store in `last_function_parms' a chain of the decls of parms.
5105 Also store in `last_function_parm_tags' a chain of the struct, union,
5106 and enum tags declared among the parms.
5108 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5110 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5111 a mere declaration. A nonempty identifier-list gets an error message
5112 when FUNCDEF_FLAG is zero. */
5115 grokparms (parms_info, funcdef_flag)
5119 tree first_parm = TREE_CHAIN (parms_info);
5121 last_function_parms = TREE_PURPOSE (parms_info);
5122 last_function_parm_tags = TREE_VALUE (parms_info);
5124 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5125 && !in_system_header)
5126 warning ("function declaration isn't a prototype");
5129 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5132 pedwarn ("parameter names (without types) in function declaration");
5134 last_function_parms = first_parm;
5141 /* We no longer test FUNCDEF_FLAG.
5142 If the arg types are incomplete in a declaration,
5143 they must include undefined tags.
5144 These tags can never be defined in the scope of the declaration,
5145 so the types can never be completed,
5146 and no call can be compiled successfully. */
5148 /* In a fcn definition, arg types must be complete. */
5151 for (parm = last_function_parms, typelt = first_parm;
5153 parm = TREE_CHAIN (parm))
5154 /* Skip over any enumeration constants declared here. */
5155 if (TREE_CODE (parm) == PARM_DECL)
5157 /* Barf if the parameter itself has an incomplete type. */
5158 tree type = TREE_VALUE (typelt);
5159 if (TYPE_SIZE (type) == 0)
5161 if (funcdef_flag && DECL_NAME (parm) != 0)
5162 error ("parameter `%s' has incomplete type",
5163 IDENTIFIER_POINTER (DECL_NAME (parm)));
5165 warning ("parameter has incomplete type");
5168 TREE_VALUE (typelt) = error_mark_node;
5169 TREE_TYPE (parm) = error_mark_node;
5172 #if 0 /* This has been replaced by parm_tags_warning
5173 which uses a more accurate criterion for what to warn about. */
5176 /* Now warn if is a pointer to an incomplete type. */
5177 while (TREE_CODE (type) == POINTER_TYPE
5178 || TREE_CODE (type) == REFERENCE_TYPE)
5179 type = TREE_TYPE (type);
5180 type = TYPE_MAIN_VARIANT (type);
5181 if (TYPE_SIZE (type) == 0)
5183 if (DECL_NAME (parm) != 0)
5184 warning ("parameter `%s' points to incomplete type",
5185 IDENTIFIER_POINTER (DECL_NAME (parm)));
5187 warning ("parameter points to incomplete type");
5191 typelt = TREE_CHAIN (typelt);
5194 /* Allocate the list of types the way we allocate a type. */
5195 if (first_parm && ! TREE_PERMANENT (first_parm))
5197 /* Construct a copy of the list of types
5198 on the saveable obstack. */
5200 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5201 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5203 return nreverse (result);
5206 /* The list we have is permanent already. */
5212 /* Return a tree_list node with info on a parameter list just parsed.
5213 The TREE_PURPOSE is a chain of decls of those parms.
5214 The TREE_VALUE is a list of structure, union and enum tags defined.
5215 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5216 This tree_list node is later fed to `grokparms'.
5218 VOID_AT_END nonzero means append `void' to the end of the type-list.
5219 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5222 get_parm_info (void_at_end)
5225 register tree decl, t;
5226 register tree types = 0;
5228 tree tags = gettags ();
5229 tree parms = getdecls ();
5231 tree order = current_binding_level->parm_order;
5233 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5234 if (void_at_end && parms != 0
5235 && TREE_CHAIN (parms) == 0
5236 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5237 && DECL_NAME (parms) == 0)
5240 storedecls (NULL_TREE);
5241 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5242 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5245 /* Extract enumerator values and other non-parms declared with the parms.
5246 Likewise any forward parm decls that didn't have real parm decls. */
5247 for (decl = parms; decl; )
5249 tree next = TREE_CHAIN (decl);
5251 if (TREE_CODE (decl) != PARM_DECL)
5253 TREE_CHAIN (decl) = new_parms;
5256 else if (TREE_ASM_WRITTEN (decl))
5258 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5259 TREE_CHAIN (decl) = new_parms;
5265 /* Put the parm decls back in the order they were in in the parm list. */
5266 for (t = order; t; t = TREE_CHAIN (t))
5269 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5271 TREE_CHAIN (TREE_VALUE (t)) = 0;
5274 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5277 /* Store the parmlist in the binding level since the old one
5278 is no longer a valid list. (We have changed the chain pointers.) */
5279 storedecls (new_parms);
5281 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5282 /* There may also be declarations for enumerators if an enumeration
5283 type is declared among the parms. Ignore them here. */
5284 if (TREE_CODE (decl) == PARM_DECL)
5286 /* Since there is a prototype,
5287 args are passed in their declared types. */
5288 tree type = TREE_TYPE (decl);
5289 DECL_ARG_TYPE (decl) = type;
5290 #ifdef PROMOTE_PROTOTYPES
5291 if ((TREE_CODE (type) == INTEGER_TYPE
5292 || TREE_CODE (type) == ENUMERAL_TYPE)
5293 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5294 DECL_ARG_TYPE (decl) = integer_type_node;
5297 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5298 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5299 && DECL_NAME (decl) == 0)
5301 error ("`void' in parameter list must be the entire list");
5307 return saveable_tree_cons (new_parms, tags,
5308 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5310 return saveable_tree_cons (new_parms, tags, nreverse (types));
5313 /* At end of parameter list, warn about any struct, union or enum tags
5314 defined within. Do so because these types cannot ever become complete. */
5317 parmlist_tags_warning ()
5322 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5324 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5325 /* An anonymous union parm type is meaningful as a GNU extension.
5326 So don't warn for that. */
5327 if (code == UNION_TYPE && !pedantic)
5329 if (TREE_PURPOSE (elt) != 0)
5330 warning ("`%s %s' declared inside parameter list",
5331 (code == RECORD_TYPE ? "struct"
5332 : code == UNION_TYPE ? "union"
5334 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5336 warning ("anonymous %s declared inside parameter list",
5337 (code == RECORD_TYPE ? "struct"
5338 : code == UNION_TYPE ? "union"
5343 warning ("its scope is only this definition or declaration,");
5344 warning ("which is probably not what you want.");
5350 /* Get the struct, enum or union (CODE says which) with tag NAME.
5351 Define the tag as a forward-reference if it is not defined. */
5354 xref_tag (code, name)
5355 enum tree_code code;
5358 int temporary = allocation_temporary_p ();
5360 /* If a cross reference is requested, look up the type
5361 already defined for this tag and return it. */
5363 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5364 /* Even if this is the wrong type of tag, return what we found.
5365 There will be an error message anyway, from pending_xref_error.
5366 If we create an empty xref just for an invalid use of the type,
5367 the main result is to create lots of superfluous error messages. */
5371 push_obstacks_nochange ();
5373 if (current_binding_level == global_binding_level && temporary)
5374 end_temporary_allocation ();
5376 /* If no such tag is yet defined, create a forward-reference node
5377 and record it as the "definition".
5378 When a real declaration of this type is found,
5379 the forward-reference will be altered into a real type. */
5381 ref = make_node (code);
5382 if (code == ENUMERAL_TYPE)
5384 /* (In ANSI, Enums can be referred to only if already defined.) */
5386 pedwarn ("ANSI C forbids forward references to `enum' types");
5387 /* Give the type a default layout like unsigned int
5388 to avoid crashing if it does not get defined. */
5389 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5390 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5391 TREE_UNSIGNED (ref) = 1;
5392 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5393 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5394 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5397 pushtag (name, ref);
5404 /* Make sure that the tag NAME is defined *in the current binding level*
5405 at least as a forward reference.
5406 CODE says which kind of tag NAME ought to be.
5408 We also do a push_obstacks_nochange
5409 whose matching pop is in finish_struct. */
5412 start_struct (code, name)
5413 enum tree_code code;
5416 /* If there is already a tag defined at this binding level
5417 (as a forward reference), just return it. */
5419 register tree ref = 0;
5421 push_obstacks_nochange ();
5422 if (current_binding_level == global_binding_level)
5423 end_temporary_allocation ();
5426 ref = lookup_tag (code, name, current_binding_level, 1);
5427 if (ref && TREE_CODE (ref) == code)
5429 C_TYPE_BEING_DEFINED (ref) = 1;
5430 if (TYPE_FIELDS (ref))
5431 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5432 : "redefinition of `struct %s'"),
5433 IDENTIFIER_POINTER (name));
5438 /* Otherwise create a forward-reference just so the tag is in scope. */
5440 ref = make_node (code);
5441 pushtag (name, ref);
5442 C_TYPE_BEING_DEFINED (ref) = 1;
5443 TYPE_PACKED (ref) = flag_pack_struct;
5447 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5448 of a structure component, returning a FIELD_DECL node.
5449 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5451 This is done during the parsing of the struct declaration.
5452 The FIELD_DECL nodes are chained together and the lot of them
5453 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5456 grokfield (filename, line, declarator, declspecs, width)
5459 tree declarator, declspecs, width;
5463 /* The corresponding pop_obstacks is in finish_decl. */
5464 push_obstacks_nochange ();
5466 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5468 finish_decl (value, NULL_TREE, NULL_TREE);
5469 DECL_INITIAL (value) = width;
5471 maybe_objc_check_decl (value);
5475 /* Function to help qsort sort FIELD_DECLs by name order. */
5478 field_decl_cmp (x, y)
5481 if (DECL_NAME (*x) == DECL_NAME (*y))
5483 if (DECL_NAME (*x) == NULL)
5485 if (DECL_NAME (*y) == NULL)
5487 if (DECL_NAME (*x) < DECL_NAME (*y))
5492 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5493 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5494 ATTRIBUTES are attributes to be applied to the structure.
5496 We also do a pop_obstacks to match the push in start_struct. */
5499 finish_struct (t, fieldlist, attributes)
5506 int toplevel = global_binding_level == current_binding_level;
5508 /* If this type was previously laid out as a forward reference,
5509 make sure we lay it out again. */
5513 decl_attributes (t, attributes, NULL_TREE);
5515 /* Nameless union parm types are useful as GCC extension. */
5516 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5517 /* Otherwise, warn about any struct or union def. in parmlist. */
5518 if (in_parm_level_p ())
5521 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5522 : "structure defined inside parms"));
5523 else if (! flag_traditional)
5524 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5525 : "structure defined inside parms"));
5528 old_momentary = suspend_momentary ();
5532 for (x = fieldlist; x; x = TREE_CHAIN (x))
5533 if (DECL_NAME (x) != 0)
5537 pedwarn ("%s has no %smembers",
5538 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5539 (fieldlist ? "named " : ""));
5542 /* Install struct as DECL_CONTEXT of each field decl.
5543 Also process specified field sizes.
5544 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5545 The specified size is found in the DECL_INITIAL.
5546 Store 0 there, except for ": 0" fields (so we can find them
5547 and delete them, below). */
5549 for (x = fieldlist; x; x = TREE_CHAIN (x))
5551 DECL_CONTEXT (x) = t;
5552 DECL_PACKED (x) |= TYPE_PACKED (t);
5553 DECL_FIELD_SIZE (x) = 0;
5555 /* If any field is const, the structure type is pseudo-const. */
5556 if (TREE_READONLY (x))
5557 C_TYPE_FIELDS_READONLY (t) = 1;
5560 /* A field that is pseudo-const makes the structure likewise. */
5561 tree t1 = TREE_TYPE (x);
5562 while (TREE_CODE (t1) == ARRAY_TYPE)
5563 t1 = TREE_TYPE (t1);
5564 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5565 && C_TYPE_FIELDS_READONLY (t1))
5566 C_TYPE_FIELDS_READONLY (t) = 1;
5569 /* Any field that is volatile means variables of this type must be
5570 treated in some ways as volatile. */
5571 if (TREE_THIS_VOLATILE (x))
5572 C_TYPE_FIELDS_VOLATILE (t) = 1;
5574 /* Any field of nominal variable size implies structure is too. */
5575 if (C_DECL_VARIABLE_SIZE (x))
5576 C_TYPE_VARIABLE_SIZE (t) = 1;
5578 /* Detect invalid nested redefinition. */
5579 if (TREE_TYPE (x) == t)
5580 error ("nested redefinition of `%s'",
5581 IDENTIFIER_POINTER (TYPE_NAME (t)));
5583 /* Detect invalid bit-field size. */
5584 if (DECL_INITIAL (x))
5585 STRIP_NOPS (DECL_INITIAL (x));
5586 if (DECL_INITIAL (x))
5588 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5589 constant_expression_warning (DECL_INITIAL (x));
5592 error_with_decl (x, "bit-field `%s' width not an integer constant");
5593 DECL_INITIAL (x) = NULL;
5597 /* Detect invalid bit-field type. */
5598 if (DECL_INITIAL (x)
5599 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5600 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5602 error_with_decl (x, "bit-field `%s' has invalid type");
5603 DECL_INITIAL (x) = NULL;
5605 if (DECL_INITIAL (x) && pedantic
5606 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5607 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5608 /* Accept an enum that's equivalent to int or unsigned int. */
5609 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5610 && (TYPE_PRECISION (TREE_TYPE (x))
5611 == TYPE_PRECISION (integer_type_node))))
5612 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5614 /* Detect and ignore out of range field width. */
5615 if (DECL_INITIAL (x))
5617 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5619 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5621 DECL_INITIAL (x) = NULL;
5622 error_with_decl (x, "negative width in bit-field `%s'");
5624 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5625 || width > TYPE_PRECISION (TREE_TYPE (x)))
5627 DECL_INITIAL (x) = NULL;
5628 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5630 else if (width == 0 && DECL_NAME (x) != 0)
5632 error_with_decl (x, "zero width for bit-field `%s'");
5633 DECL_INITIAL (x) = NULL;
5637 /* Process valid field width. */
5638 if (DECL_INITIAL (x))
5640 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5642 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5643 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5644 TREE_UNSIGNED (TREE_TYPE (x)))
5645 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5646 TREE_UNSIGNED (TREE_TYPE (x)))))
5647 warning_with_decl (x, "`%s' is narrower than values of its type");
5649 DECL_FIELD_SIZE (x) = width;
5650 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5651 DECL_INITIAL (x) = NULL;
5655 /* field size 0 => force desired amount of alignment. */
5656 #ifdef EMPTY_FIELD_BOUNDARY
5657 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5659 #ifdef PCC_BITFIELD_TYPE_MATTERS
5660 if (PCC_BITFIELD_TYPE_MATTERS)
5661 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5662 TYPE_ALIGN (TREE_TYPE (x)));
5666 else if (TREE_TYPE (x) != error_mark_node)
5668 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5669 : TYPE_ALIGN (TREE_TYPE (x)));
5670 /* Non-bit-fields are aligned for their type, except packed
5671 fields which require only BITS_PER_UNIT alignment. */
5672 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5676 /* Now DECL_INITIAL is null on all members. */
5678 /* Delete all duplicate fields from the fieldlist */
5679 for (x = fieldlist; x && TREE_CHAIN (x);)
5680 /* Anonymous fields aren't duplicates. */
5681 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5685 register tree y = fieldlist;
5689 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5695 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5697 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5698 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5700 else x = TREE_CHAIN (x);
5703 /* Now we have the nearly final fieldlist. Record it,
5704 then lay out the structure or union (including the fields). */
5706 TYPE_FIELDS (t) = fieldlist;
5710 /* Delete all zero-width bit-fields from the front of the fieldlist */
5712 && DECL_INITIAL (fieldlist))
5713 fieldlist = TREE_CHAIN (fieldlist);
5714 /* Delete all such members from the rest of the fieldlist */
5715 for (x = fieldlist; x;)
5717 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5718 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5719 else x = TREE_CHAIN (x);
5722 /* Now we have the truly final field list.
5723 Store it in this type and in the variants. */
5725 TYPE_FIELDS (t) = fieldlist;
5727 /* If there are lots of fields, sort so we can look through them fast.
5728 We arbitrarily consider 16 or more elts to be "a lot". */
5732 for (x = fieldlist; x; x = TREE_CHAIN (x))
5743 len += list_length (x);
5744 /* Use the same allocation policy here that make_node uses, to
5745 ensure that this lives as long as the rest of the struct decl.
5746 All decls in an inline function need to be saved. */
5747 if (allocation_temporary_p ())
5748 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5750 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5752 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5753 TYPE_LANG_SPECIFIC (t)->len = len;
5755 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5757 for (x = fieldlist; x; x = TREE_CHAIN (x))
5758 field_array[len++] = x;
5760 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5764 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5766 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5767 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5768 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5771 /* If this was supposed to be a transparent union, but we can't
5772 make it one, warn and turn off the flag. */
5773 if (TREE_CODE (t) == UNION_TYPE
5774 && TYPE_TRANSPARENT_UNION (t)
5775 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5777 TYPE_TRANSPARENT_UNION (t) = 0;
5778 warning ("union cannot be made transparent");
5781 /* If this structure or union completes the type of any previous
5782 variable declaration, lay it out and output its rtl. */
5784 if (current_binding_level->n_incomplete != 0)
5787 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5789 if (TREE_TYPE (decl) == t
5790 && TREE_CODE (decl) != TYPE_DECL)
5792 layout_decl (decl, 0);
5793 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5794 maybe_objc_check_decl (decl);
5795 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5798 --current_binding_level->n_incomplete;
5800 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5801 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5803 tree element = TREE_TYPE (decl);
5804 while (TREE_CODE (element) == ARRAY_TYPE)
5805 element = TREE_TYPE (element);
5807 layout_array_type (TREE_TYPE (decl));
5812 resume_momentary (old_momentary);
5814 /* Finish debugging output for this type. */
5815 rest_of_type_compilation (t, toplevel);
5817 /* The matching push is in start_struct. */
5823 /* Lay out the type T, and its element type, and so on. */
5826 layout_array_type (t)
5829 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5830 layout_array_type (TREE_TYPE (t));
5834 /* Begin compiling the definition of an enumeration type.
5835 NAME is its name (or null if anonymous).
5836 Returns the type object, as yet incomplete.
5837 Also records info about it so that build_enumerator
5838 may be used to declare the individual values as they are read. */
5844 register tree enumtype = 0;
5846 /* If this is the real definition for a previous forward reference,
5847 fill in the contents in the same object that used to be the
5848 forward reference. */
5851 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5853 /* The corresponding pop_obstacks is in finish_enum. */
5854 push_obstacks_nochange ();
5855 /* If these symbols and types are global, make them permanent. */
5856 if (current_binding_level == global_binding_level)
5857 end_temporary_allocation ();
5859 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5861 enumtype = make_node (ENUMERAL_TYPE);
5862 pushtag (name, enumtype);
5865 C_TYPE_BEING_DEFINED (enumtype) = 1;
5867 if (TYPE_VALUES (enumtype) != 0)
5869 /* This enum is a named one that has been declared already. */
5870 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5872 /* Completely replace its old definition.
5873 The old enumerators remain defined, however. */
5874 TYPE_VALUES (enumtype) = 0;
5877 enum_next_value = integer_zero_node;
5880 if (flag_short_enums)
5881 TYPE_PACKED (enumtype) = 1;
5886 /* After processing and defining all the values of an enumeration type,
5887 install their decls in the enumeration type and finish it off.
5888 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5889 and ATTRIBUTES are the specified attributes.
5890 Returns ENUMTYPE. */
5893 finish_enum (enumtype, values, attributes)
5898 register tree pair, tem;
5899 tree minnode = 0, maxnode = 0;
5900 int lowprec, highprec, precision;
5901 int toplevel = global_binding_level == current_binding_level;
5903 if (in_parm_level_p ())
5904 warning ("enum defined inside parms");
5906 decl_attributes (enumtype, attributes, NULL_TREE);
5908 /* Calculate the maximum value of any enumerator in this type. */
5910 if (values == error_mark_node)
5911 minnode = maxnode = integer_zero_node;
5913 for (pair = values; pair; pair = TREE_CHAIN (pair))
5915 tree value = TREE_VALUE (pair);
5917 minnode = maxnode = TREE_VALUE (pair);
5920 if (tree_int_cst_lt (maxnode, value))
5922 if (tree_int_cst_lt (value, minnode))
5927 TYPE_MIN_VALUE (enumtype) = minnode;
5928 TYPE_MAX_VALUE (enumtype) = maxnode;
5930 /* An enum can have some negative values; then it is signed. */
5931 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5933 /* Determine the precision this type needs. */
5935 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5936 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5937 precision = MAX (lowprec, highprec);
5939 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5941 tree narrowest = type_for_size (precision, 1);
5944 warning ("enumeration values exceed range of largest integer");
5945 narrowest = long_long_integer_type_node;
5948 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5951 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5953 TYPE_SIZE (enumtype) = 0;
5954 layout_type (enumtype);
5956 if (values != error_mark_node)
5958 /* Change the type of the enumerators to be the enum type.
5959 Formerly this was done only for enums that fit in an int,
5960 but the comment said it was done only for enums wider than int.
5961 It seems necessary to do this for wide enums,
5962 and best not to change what's done for ordinary narrower ones. */
5963 for (pair = values; pair; pair = TREE_CHAIN (pair))
5965 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5966 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5967 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5968 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5971 /* Replace the decl nodes in VALUES with their names. */
5972 for (pair = values; pair; pair = TREE_CHAIN (pair))
5973 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5975 TYPE_VALUES (enumtype) = values;
5978 /* Fix up all variant types of this enum type. */
5979 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5981 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5982 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5983 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5984 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5985 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5986 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5987 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5988 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5991 /* Finish debugging output for this type. */
5992 rest_of_type_compilation (enumtype, toplevel);
5994 /* This matches a push in start_enum. */
6000 /* Build and install a CONST_DECL for one value of the
6001 current enumeration type (one that was begun with start_enum).
6002 Return a tree-list containing the CONST_DECL and its value.
6003 Assignment of sequential values by default is handled here. */
6006 build_enumerator (name, value)
6009 register tree decl, type;
6011 /* Validate and default VALUE. */
6013 /* Remove no-op casts from the value. */
6015 STRIP_TYPE_NOPS (value);
6019 if (TREE_CODE (value) == INTEGER_CST)
6021 value = default_conversion (value);
6022 constant_expression_warning (value);
6026 error ("enumerator value for `%s' not integer constant",
6027 IDENTIFIER_POINTER (name));
6032 /* Default based on previous value. */
6033 /* It should no longer be possible to have NON_LVALUE_EXPR
6037 value = enum_next_value;
6039 error ("overflow in enumeration values");
6042 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6044 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6045 value = integer_zero_node;
6048 /* Set basis for default for next value. */
6049 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6050 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6052 /* Now create a declaration for the enum value name. */
6054 type = TREE_TYPE (value);
6055 type = type_for_size (MAX (TYPE_PRECISION (type),
6056 TYPE_PRECISION (integer_type_node)),
6058 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6059 && TREE_UNSIGNED (type)));
6061 decl = build_decl (CONST_DECL, name, type);
6062 DECL_INITIAL (decl) = value;
6063 TREE_TYPE (value) = type;
6066 return saveable_tree_cons (decl, value, NULL_TREE);
6069 /* Create the FUNCTION_DECL for a function definition.
6070 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6071 the declaration; they describe the function's name and the type it returns,
6072 but twisted together in a fashion that parallels the syntax of C.
6074 This function creates a binding context for the function body
6075 as well as setting up the FUNCTION_DECL in current_function_decl.
6077 Returns 1 on success. If the DECLARATOR is not suitable for a function
6078 (it defines a datum instead), we return 0, which tells
6079 yyparse to report a parse error.
6081 NESTED is nonzero for a function nested within another function. */
6084 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6085 tree declarator, declspecs, prefix_attributes, attributes;
6088 tree decl1, old_decl;
6090 int old_immediate_size_expand = immediate_size_expand;
6092 current_function_returns_value = 0; /* Assume, until we see it does. */
6093 current_function_returns_null = 0;
6094 warn_about_return_type = 0;
6095 current_extern_inline = 0;
6096 c_function_varargs = 0;
6098 shadowed_labels = 0;
6100 /* Don't expand any sizes in the return type of the function. */
6101 immediate_size_expand = 0;
6103 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6105 /* If the declarator is not suitable for a function definition,
6106 cause a syntax error. */
6110 decl_attributes (decl1, prefix_attributes, attributes);
6112 announce_function (decl1);
6114 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6116 error ("return-type is an incomplete type");
6117 /* Make it return void instead. */
6119 = build_function_type (void_type_node,
6120 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6123 if (warn_about_return_type)
6124 warning ("return-type defaults to `int'");
6126 /* Save the parm names or decls from this function's declarator
6127 where store_parm_decls will find them. */
6128 current_function_parms = last_function_parms;
6129 current_function_parm_tags = last_function_parm_tags;
6131 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6132 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6133 DECL_INITIAL (decl1) = error_mark_node;
6135 /* If this definition isn't a prototype and we had a prototype declaration
6136 before, copy the arg type info from that prototype.
6137 But not if what we had before was a builtin function. */
6138 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6139 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6140 && !DECL_BUILT_IN (old_decl)
6141 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6142 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6143 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6145 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6146 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6147 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6150 /* If there is no explicit declaration, look for any out-of-scope implicit
6153 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6155 /* Optionally warn of old-fashioned def with no previous prototype. */
6156 if (warn_strict_prototypes
6157 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6158 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6159 warning ("function declaration isn't a prototype");
6160 /* Optionally warn of any global def with no previous prototype. */
6161 else if (warn_missing_prototypes
6162 && TREE_PUBLIC (decl1)
6163 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6164 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6165 warning_with_decl (decl1, "no previous prototype for `%s'");
6166 /* Optionally warn of any def with no previous prototype
6167 if the function has already been used. */
6168 else if (warn_missing_prototypes
6169 && old_decl != 0 && TREE_USED (old_decl)
6170 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6171 warning_with_decl (decl1,
6172 "`%s' was used with no prototype before its definition");
6173 /* Optionally warn of any global def with no previous declaration. */
6174 else if (warn_missing_declarations
6175 && TREE_PUBLIC (decl1)
6177 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6178 warning_with_decl (decl1, "no previous declaration for `%s'");
6179 /* Optionally warn of any def with no previous declaration
6180 if the function has already been used. */
6181 else if (warn_missing_declarations
6182 && old_decl != 0 && TREE_USED (old_decl)
6183 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6184 warning_with_decl (decl1,
6185 "`%s' was used with no declaration before its definition");
6187 /* This is a definition, not a reference.
6188 So normally clear DECL_EXTERNAL.
6189 However, `extern inline' acts like a declaration
6190 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6191 DECL_EXTERNAL (decl1) = current_extern_inline;
6193 /* This function exists in static storage.
6194 (This does not mean `static' in the C sense!) */
6195 TREE_STATIC (decl1) = 1;
6197 /* A nested function is not global. */
6198 if (current_function_decl != 0)
6199 TREE_PUBLIC (decl1) = 0;
6201 /* Record the decl so that the function name is defined.
6202 If we already have a decl for this name, and it is a FUNCTION_DECL,
6203 use the old decl. */
6205 current_function_decl = pushdecl (decl1);
6208 declare_parm_level (1);
6209 current_binding_level->subblocks_tag_transparent = 1;
6211 make_function_rtl (current_function_decl);
6213 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6214 /* Promote the value to int before returning it. */
6215 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6217 /* It retains unsignedness if traditional
6218 or if not really getting wider. */
6219 if (TREE_UNSIGNED (restype)
6220 && (flag_traditional
6221 || (TYPE_PRECISION (restype)
6222 == TYPE_PRECISION (integer_type_node))))
6223 restype = unsigned_type_node;
6225 restype = integer_type_node;
6227 DECL_RESULT (current_function_decl)
6228 = build_decl (RESULT_DECL, NULL_TREE, restype);
6231 /* Allocate further tree nodes temporarily during compilation
6232 of this function only. */
6233 temporary_allocation ();
6235 /* If this fcn was already referenced via a block-scope `extern' decl
6236 (or an implicit decl), propagate certain information about the usage. */
6237 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6238 TREE_ADDRESSABLE (current_function_decl) = 1;
6240 immediate_size_expand = old_immediate_size_expand;
6245 /* Record that this function is going to be a varargs function.
6246 This is called before store_parm_decls, which is too early
6247 to call mark_varargs directly. */
6252 c_function_varargs = 1;
6255 /* Store the parameter declarations into the current function declaration.
6256 This is called after parsing the parameter declarations, before
6257 digesting the body of the function.
6259 For an old-style definition, modify the function's type
6260 to specify at least the number of arguments. */
6265 register tree fndecl = current_function_decl;
6268 /* This is either a chain of PARM_DECLs (if a prototype was used)
6269 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6270 tree specparms = current_function_parms;
6272 /* This is a list of types declared among parms in a prototype. */
6273 tree parmtags = current_function_parm_tags;
6275 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6276 register tree parmdecls = getdecls ();
6278 /* This is a chain of any other decls that came in among the parm
6279 declarations. If a parm is declared with enum {foo, bar} x;
6280 then CONST_DECLs for foo and bar are put here. */
6283 /* Nonzero if this definition is written with a prototype. */
6286 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6288 /* This case is when the function was defined with an ANSI prototype.
6289 The parms already have decls, so we need not do anything here
6290 except record them as in effect
6291 and complain if any redundant old-style parm decls were written. */
6302 error_with_decl (fndecl,
6303 "parm types given both in parmlist and separately");
6304 /* Get rid of the erroneous decls; don't keep them on
6305 the list of parms, since they might not be PARM_DECLs. */
6306 for (decl = current_binding_level->names;
6307 decl; decl = TREE_CHAIN (decl))
6308 if (DECL_NAME (decl))
6309 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6310 for (link = current_binding_level->shadowed;
6311 link; link = TREE_CHAIN (link))
6312 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6313 current_binding_level->names = 0;
6314 current_binding_level->shadowed = 0;
6317 specparms = nreverse (specparms);
6318 for (parm = specparms; parm; parm = next)
6320 next = TREE_CHAIN (parm);
6321 if (TREE_CODE (parm) == PARM_DECL)
6323 if (DECL_NAME (parm) == 0)
6324 error_with_decl (parm, "parameter name omitted");
6325 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6327 error_with_decl (parm, "parameter `%s' declared void");
6328 /* Change the type to error_mark_node so this parameter
6329 will be ignored by assign_parms. */
6330 TREE_TYPE (parm) = error_mark_node;
6336 /* If we find an enum constant or a type tag,
6337 put it aside for the moment. */
6338 TREE_CHAIN (parm) = 0;
6339 others = chainon (others, parm);
6343 /* Get the decls in their original chain order
6344 and record in the function. */
6345 DECL_ARGUMENTS (fndecl) = getdecls ();
6348 /* If this function takes a variable number of arguments,
6349 add a phony parameter to the end of the parm list,
6350 to represent the position of the first unnamed argument. */
6351 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6354 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6355 /* Let's hope the address of the unnamed parm
6356 won't depend on its type. */
6357 TREE_TYPE (dummy) = integer_type_node;
6358 DECL_ARG_TYPE (dummy) = integer_type_node;
6359 DECL_ARGUMENTS (fndecl)
6360 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6364 /* Now pushdecl the enum constants. */
6365 for (parm = others; parm; parm = next)
6367 next = TREE_CHAIN (parm);
6368 if (DECL_NAME (parm) == 0)
6370 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6372 else if (TREE_CODE (parm) != PARM_DECL)
6376 storetags (chainon (parmtags, gettags ()));
6380 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6381 each with a parm name as the TREE_VALUE.
6383 PARMDECLS is a chain of declarations for parameters.
6384 Warning! It can also contain CONST_DECLs which are not parameters
6385 but are names of enumerators of any enum types
6386 declared among the parameters.
6388 First match each formal parameter name with its declaration.
6389 Associate decls with the names and store the decls
6390 into the TREE_PURPOSE slots. */
6392 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6393 DECL_RESULT (parm) = 0;
6395 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6397 register tree tail, found = NULL;
6399 if (TREE_VALUE (parm) == 0)
6401 error_with_decl (fndecl, "parameter name missing from parameter list");
6402 TREE_PURPOSE (parm) = 0;
6406 /* See if any of the parmdecls specifies this parm by name.
6407 Ignore any enumerator decls. */
6408 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6409 if (DECL_NAME (tail) == TREE_VALUE (parm)
6410 && TREE_CODE (tail) == PARM_DECL)
6416 /* If declaration already marked, we have a duplicate name.
6417 Complain, and don't use this decl twice. */
6418 if (found && DECL_RESULT (found) != 0)
6420 error_with_decl (found, "multiple parameters named `%s'");
6424 /* If the declaration says "void", complain and ignore it. */
6425 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6427 error_with_decl (found, "parameter `%s' declared void");
6428 TREE_TYPE (found) = integer_type_node;
6429 DECL_ARG_TYPE (found) = integer_type_node;
6430 layout_decl (found, 0);
6433 /* Traditionally, a parm declared float is actually a double. */
6434 if (found && flag_traditional
6435 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6437 TREE_TYPE (found) = double_type_node;
6438 DECL_ARG_TYPE (found) = double_type_node;
6439 layout_decl (found, 0);
6442 /* If no declaration found, default to int. */
6445 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6447 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6448 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6449 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6451 warning_with_decl (found, "type of `%s' defaults to `int'");
6455 TREE_PURPOSE (parm) = found;
6457 /* Mark this decl as "already found" -- see test, above.
6458 It is safe to use DECL_RESULT for this
6459 since it is not used in PARM_DECLs or CONST_DECLs. */
6460 DECL_RESULT (found) = error_mark_node;
6463 /* Put anything which is on the parmdecls chain and which is
6464 not a PARM_DECL onto the list NONPARMS. (The types of
6465 non-parm things which might appear on the list include
6466 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6467 any actual PARM_DECLs not matched with any names. */
6470 for (parm = parmdecls; parm; )
6472 tree next = TREE_CHAIN (parm);
6473 TREE_CHAIN (parm) = 0;
6475 if (TREE_CODE (parm) != PARM_DECL)
6476 nonparms = chainon (nonparms, parm);
6479 /* Complain about args with incomplete types. */
6480 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6482 error_with_decl (parm, "parameter `%s' has incomplete type");
6483 TREE_TYPE (parm) = error_mark_node;
6486 if (DECL_RESULT (parm) == 0)
6488 error_with_decl (parm,
6489 "declaration for parameter `%s' but no such parameter");
6490 /* Pretend the parameter was not missing.
6491 This gets us to a standard state and minimizes
6492 further error messages. */
6494 = chainon (specparms,
6495 tree_cons (parm, NULL_TREE, NULL_TREE));
6502 /* Chain the declarations together in the order of the list of names. */
6503 /* Store that chain in the function decl, replacing the list of names. */
6505 DECL_ARGUMENTS (fndecl) = 0;
6508 for (last = 0; parm; parm = TREE_CHAIN (parm))
6509 if (TREE_PURPOSE (parm))
6512 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6514 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6515 last = TREE_PURPOSE (parm);
6516 TREE_CHAIN (last) = 0;
6520 /* If there was a previous prototype,
6521 set the DECL_ARG_TYPE of each argument according to
6522 the type previously specified, and report any mismatches. */
6524 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6527 for (parm = DECL_ARGUMENTS (fndecl),
6528 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6529 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6530 != void_type_node));
6531 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6533 if (parm == 0 || type == 0
6534 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6536 error ("number of arguments doesn't match prototype");
6537 error_with_file_and_line (current_function_prototype_file,
6538 current_function_prototype_line,
6539 "prototype declaration");
6542 /* Type for passing arg must be consistent
6543 with that declared for the arg. */
6544 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6546 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6547 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6549 /* Adjust argument to match prototype. E.g. a previous
6550 `int foo(float);' prototype causes
6551 `int foo(x) float x; {...}' to be treated like
6552 `int foo(float x) {...}'. This is particularly
6553 useful for argument types like uid_t. */
6554 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6555 #ifdef PROMOTE_PROTOTYPES
6556 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6557 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6558 && TYPE_PRECISION (TREE_TYPE (parm))
6559 < TYPE_PRECISION (integer_type_node))
6560 DECL_ARG_TYPE (parm) = integer_type_node;
6564 pedwarn ("promoted argument `%s' doesn't match prototype",
6565 IDENTIFIER_POINTER (DECL_NAME (parm)));
6566 warning_with_file_and_line
6567 (current_function_prototype_file,
6568 current_function_prototype_line,
6569 "prototype declaration");
6572 /* If -traditional, allow `int' argument to match
6573 `unsigned' prototype. */
6574 else if (! (flag_traditional
6575 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6576 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6578 error ("argument `%s' doesn't match prototype",
6579 IDENTIFIER_POINTER (DECL_NAME (parm)));
6580 error_with_file_and_line (current_function_prototype_file,
6581 current_function_prototype_line,
6582 "prototype declaration");
6586 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6589 /* Otherwise, create a prototype that would match. */
6593 tree actual = 0, last = 0, type;
6595 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6597 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6600 TREE_CHAIN (last) = type;
6605 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6607 TREE_CHAIN (last) = type;
6611 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6612 of the type of this function, but we need to avoid having this
6613 affect the types of other similarly-typed functions, so we must
6614 first force the generation of an identical (but separate) type
6615 node for the relevant function type. The new node we create
6616 will be a variant of the main variant of the original function
6619 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6621 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6624 /* Now store the final chain of decls for the arguments
6625 as the decl-chain of the current lexical scope.
6626 Put the enumerators in as well, at the front so that
6627 DECL_ARGUMENTS is not modified. */
6629 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6632 /* Make sure the binding level for the top of the function body
6633 gets a BLOCK if there are any in the function.
6634 Otherwise, the dbx output is wrong. */
6636 keep_next_if_subblocks = 1;
6638 /* ??? This might be an improvement,
6639 but needs to be thought about some more. */
6641 keep_next_level_flag = 1;
6644 /* Write a record describing this function definition to the prototypes
6645 file (if requested). */
6647 gen_aux_info_record (fndecl, 1, 0, prototype);
6649 /* Initialize the RTL code for the function. */
6651 init_function_start (fndecl, input_filename, lineno);
6653 /* If this is a varargs function, inform function.c. */
6655 if (c_function_varargs)
6658 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6660 declare_function_name ();
6662 /* Set up parameters and prepare for return, for the function. */
6664 expand_function_start (fndecl, 0);
6666 /* If this function is `main', emit a call to `__main'
6667 to run global initializers, etc. */
6668 if (DECL_NAME (fndecl)
6669 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6670 && DECL_CONTEXT (fndecl) == NULL_TREE)
6671 expand_main_function ();
6674 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6675 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6676 stands for an ellipsis in the identifier list.
6678 PARMLIST is the data returned by get_parm_info for the
6679 parmlist that follows the semicolon.
6681 We return a value of the same sort that get_parm_info returns,
6682 except that it describes the combination of identifiers and parmlist. */
6685 combine_parm_decls (specparms, parmlist, void_at_end)
6686 tree specparms, parmlist;
6689 register tree fndecl = current_function_decl;
6692 tree parmdecls = TREE_PURPOSE (parmlist);
6694 /* This is a chain of any other decls that came in among the parm
6695 declarations. They were separated already by get_parm_info,
6696 so we just need to keep them separate. */
6697 tree nonparms = TREE_VALUE (parmlist);
6701 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6702 DECL_RESULT (parm) = 0;
6704 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6706 register tree tail, found = NULL;
6708 /* See if any of the parmdecls specifies this parm by name. */
6709 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6710 if (DECL_NAME (tail) == TREE_VALUE (parm))
6716 /* If declaration already marked, we have a duplicate name.
6717 Complain, and don't use this decl twice. */
6718 if (found && DECL_RESULT (found) != 0)
6720 error_with_decl (found, "multiple parameters named `%s'");
6724 /* If the declaration says "void", complain and ignore it. */
6725 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6727 error_with_decl (found, "parameter `%s' declared void");
6728 TREE_TYPE (found) = integer_type_node;
6729 DECL_ARG_TYPE (found) = integer_type_node;
6730 layout_decl (found, 0);
6733 /* Traditionally, a parm declared float is actually a double. */
6734 if (found && flag_traditional
6735 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6737 TREE_TYPE (found) = double_type_node;
6738 DECL_ARG_TYPE (found) = double_type_node;
6739 layout_decl (found, 0);
6742 /* If no declaration found, default to int. */
6745 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6747 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6748 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6749 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6750 error_with_decl (found, "type of parameter `%s' is not declared");
6754 TREE_PURPOSE (parm) = found;
6756 /* Mark this decl as "already found" -- see test, above.
6757 It is safe to use DECL_RESULT for this
6758 since it is not used in PARM_DECLs or CONST_DECLs. */
6759 DECL_RESULT (found) = error_mark_node;
6762 /* Complain about any actual PARM_DECLs not matched with any names. */
6764 for (parm = parmdecls; parm; )
6766 tree next = TREE_CHAIN (parm);
6767 TREE_CHAIN (parm) = 0;
6769 /* Complain about args with incomplete types. */
6770 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6772 error_with_decl (parm, "parameter `%s' has incomplete type");
6773 TREE_TYPE (parm) = error_mark_node;
6776 if (DECL_RESULT (parm) == 0)
6778 error_with_decl (parm,
6779 "declaration for parameter `%s' but no such parameter");
6780 /* Pretend the parameter was not missing.
6781 This gets us to a standard state and minimizes
6782 further error messages. */
6784 = chainon (specparms,
6785 tree_cons (parm, NULL_TREE, NULL_TREE));
6791 /* Chain the declarations together in the order of the list of names.
6792 At the same time, build up a list of their types, in reverse order. */
6798 for (last = 0; parm; parm = TREE_CHAIN (parm))
6799 if (TREE_PURPOSE (parm))
6802 parmdecls = TREE_PURPOSE (parm);
6804 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6805 last = TREE_PURPOSE (parm);
6806 TREE_CHAIN (last) = 0;
6808 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6813 return saveable_tree_cons (parmdecls, nonparms,
6814 nreverse (saveable_tree_cons (NULL_TREE,
6818 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6821 /* Finish up a function declaration and compile that function
6822 all the way to assembler language output. The free the storage
6823 for the function definition.
6825 This is called after parsing the body of the function definition.
6827 NESTED is nonzero if the function being finished is nested in another. */
6830 finish_function (nested)
6833 register tree fndecl = current_function_decl;
6835 /* TREE_READONLY (fndecl) = 1;
6836 This caused &foo to be of type ptr-to-const-function
6837 which then got a warning when stored in a ptr-to-function variable. */
6840 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6842 /* Must mark the RESULT_DECL as being in this function. */
6844 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6846 /* Obey `register' declarations if `setjmp' is called in this fn. */
6847 if (flag_traditional && current_function_calls_setjmp)
6849 setjmp_protect (DECL_INITIAL (fndecl));
6850 setjmp_protect_args ();
6853 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6855 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6856 != integer_type_node)
6857 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6860 #ifdef DEFAULT_MAIN_RETURN
6861 /* Make it so that `main' always returns success by default. */
6862 DEFAULT_MAIN_RETURN;
6867 /* Generate rtl for function exit. */
6868 expand_function_end (input_filename, lineno, 0);
6870 /* So we can tell if jump_optimize sets it to 1. */
6873 /* Run the optimizers and output the assembler code for this function. */
6874 rest_of_compilation (fndecl);
6876 current_function_returns_null |= can_reach_end;
6878 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6879 warning ("`noreturn' function does return");
6880 else if (warn_return_type && can_reach_end
6881 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6882 /* If this function returns non-void and control can drop through,
6884 warning ("control reaches end of non-void function");
6885 /* With just -W, complain only if function returns both with
6886 and without a value. */
6887 else if (extra_warnings
6888 && current_function_returns_value && current_function_returns_null)
6889 warning ("this function may return with or without a value");
6891 /* If requested, warn about function definitions where the function will
6892 return a value (usually of some struct or union type) which itself will
6893 take up a lot of stack space. */
6895 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6897 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6901 register tree ret_type_size = TYPE_SIZE (ret_type);
6903 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6906 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6908 if (units > larger_than_size)
6909 warning_with_decl (fndecl,
6910 "size of return value of `%s' is %u bytes",
6916 /* Free all the tree nodes making up this function. */
6917 /* Switch back to allocating nodes permanently
6918 until we start another function. */
6920 permanent_allocation (1);
6922 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6924 /* Stop pointing to the local nodes about to be freed. */
6925 /* But DECL_INITIAL must remain nonzero so we know this
6926 was an actual function definition. */
6927 /* For a nested function, this is done in pop_c_function_context. */
6928 /* If rest_of_compilation set this to 0, leave it 0. */
6929 if (DECL_INITIAL (fndecl) != 0)
6930 DECL_INITIAL (fndecl) = error_mark_node;
6931 DECL_ARGUMENTS (fndecl) = 0;
6934 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6936 #ifndef ASM_OUTPUT_CONSTRUCTOR
6937 if (! flag_gnu_linker)
6938 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6941 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6943 if (DECL_STATIC_DESTRUCTOR (fndecl))
6945 #ifndef ASM_OUTPUT_DESTRUCTOR
6946 if (! flag_gnu_linker)
6947 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6950 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6955 /* Let the error reporting routines know that we're outside a
6956 function. For a nested function, this value is used in
6957 pop_c_function_context and then reset via pop_function_context. */
6958 current_function_decl = NULL;
6962 /* Save and restore the variables in this file and elsewhere
6963 that keep track of the progress of compilation of the current function.
6964 Used for nested functions. */
6968 struct c_function *next;
6970 tree shadowed_labels;
6973 int warn_about_return_type;
6975 struct binding_level *binding_level;
6978 struct c_function *c_function_chain;
6980 /* Save and reinitialize the variables
6981 used during compilation of a C function. */
6984 push_c_function_context ()
6986 struct c_function *p
6987 = (struct c_function *) xmalloc (sizeof (struct c_function));
6990 pedwarn ("ANSI C forbids nested functions");
6992 push_function_context ();
6994 p->next = c_function_chain;
6995 c_function_chain = p;
6997 p->named_labels = named_labels;
6998 p->shadowed_labels = shadowed_labels;
6999 p->returns_value = current_function_returns_value;
7000 p->returns_null = current_function_returns_null;
7001 p->warn_about_return_type = warn_about_return_type;
7002 p->extern_inline = current_extern_inline;
7003 p->binding_level = current_binding_level;
7006 /* Restore the variables used during compilation of a C function. */
7009 pop_c_function_context ()
7011 struct c_function *p = c_function_chain;
7014 /* Bring back all the labels that were shadowed. */
7015 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7016 if (DECL_NAME (TREE_VALUE (link)) != 0)
7017 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7018 = TREE_VALUE (link);
7020 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7022 /* Stop pointing to the local nodes about to be freed. */
7023 /* But DECL_INITIAL must remain nonzero so we know this
7024 was an actual function definition. */
7025 DECL_INITIAL (current_function_decl) = error_mark_node;
7026 DECL_ARGUMENTS (current_function_decl) = 0;
7029 pop_function_context ();
7031 c_function_chain = p->next;
7033 named_labels = p->named_labels;
7034 shadowed_labels = p->shadowed_labels;
7035 current_function_returns_value = p->returns_value;
7036 current_function_returns_null = p->returns_null;
7037 warn_about_return_type = p->warn_about_return_type;
7038 current_extern_inline = p->extern_inline;
7039 current_binding_level = p->binding_level;
7044 /* integrate_decl_tree calls this function, but since we don't use the
7045 DECL_LANG_SPECIFIC field, this is a no-op. */
7048 copy_lang_decl (node)