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((const GENERIC_PTR, const GENERIC_PTR));
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;
1006 else if (DECL_SAVED_INSNS (decl) != 0)
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));
1328 /* An approximation for now, so we can tell this is a function-scope tag.
1329 This will be updated in poplevel. */
1330 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1333 /* Handle when a new declaration NEWDECL
1334 has the same name as an old one OLDDECL
1335 in the same binding contour.
1336 Prints an error message if appropriate.
1338 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1339 Otherwise, return 0.
1341 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1342 and OLDDECL is in an outer binding level and should thus not be changed. */
1345 duplicate_decls (newdecl, olddecl, different_binding_level)
1346 register tree newdecl, olddecl;
1347 int different_binding_level;
1349 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1350 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1351 && DECL_INITIAL (newdecl) != 0);
1352 tree oldtype = TREE_TYPE (olddecl);
1353 tree newtype = TREE_TYPE (newdecl);
1356 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1357 DECL_MACHINE_ATTRIBUTES (newdecl) = DECL_MACHINE_ATTRIBUTES (olddecl);
1359 if (TREE_CODE (newtype) == ERROR_MARK
1360 || TREE_CODE (oldtype) == ERROR_MARK)
1363 /* New decl is completely inconsistent with the old one =>
1364 tell caller to replace the old one.
1365 This is always an error except in the case of shadowing a builtin. */
1366 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1368 if (TREE_CODE (olddecl) == FUNCTION_DECL
1369 && (DECL_BUILT_IN (olddecl)
1370 || DECL_BUILT_IN_NONANSI (olddecl)))
1372 /* If you declare a built-in or predefined function name as static,
1373 the old definition is overridden,
1374 but optionally warn this was a bad choice of name. */
1375 if (!TREE_PUBLIC (newdecl))
1379 else if (DECL_BUILT_IN (olddecl))
1380 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1382 warning_with_decl (newdecl, "shadowing library function `%s'");
1384 /* Likewise, if the built-in is not ansi, then programs can
1385 override it even globally without an error. */
1386 else if (! DECL_BUILT_IN (olddecl))
1387 warning_with_decl (newdecl,
1388 "library function `%s' declared as non-function");
1390 else if (DECL_BUILT_IN_NONANSI (olddecl))
1391 warning_with_decl (newdecl,
1392 "built-in function `%s' declared as non-function");
1394 warning_with_decl (newdecl,
1395 "built-in function `%s' declared as non-function");
1399 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1400 error_with_decl (olddecl, "previous declaration of `%s'");
1406 /* For real parm decl following a forward decl,
1407 return 1 so old decl will be reused. */
1408 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1409 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1412 /* The new declaration is the same kind of object as the old one.
1413 The declarations may partially match. Print warnings if they don't
1414 match enough. Ultimately, copy most of the information from the new
1415 decl to the old one, and keep using the old one. */
1417 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1418 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1419 && DECL_INITIAL (olddecl) == 0)
1420 /* If -traditional, avoid error for redeclaring fcn
1421 after implicit decl. */
1423 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1424 && DECL_BUILT_IN (olddecl))
1426 /* A function declaration for a built-in function. */
1427 if (!TREE_PUBLIC (newdecl))
1429 /* If you declare a built-in function name as static, the
1430 built-in definition is overridden,
1431 but optionally warn this was a bad choice of name. */
1433 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1434 /* Discard the old built-in function. */
1437 else if (!types_match)
1439 /* Accept the return type of the new declaration if same modes. */
1440 tree oldreturntype = TREE_TYPE (oldtype);
1441 tree newreturntype = TREE_TYPE (newtype);
1443 /* Make sure we put the new type in the same obstack as the old ones.
1444 If the old types are not both in the same obstack, use the
1446 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1447 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1450 push_obstacks_nochange ();
1451 end_temporary_allocation ();
1454 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1456 /* Function types may be shared, so we can't just modify
1457 the return type of olddecl's function type. */
1459 = build_function_type (newreturntype,
1460 TYPE_ARG_TYPES (oldtype));
1462 types_match = comptypes (newtype, trytype);
1466 /* Accept harmless mismatch in first argument type also.
1468 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1469 && TYPE_ARG_TYPES (oldtype) != 0
1470 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1471 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1472 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1473 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1475 /* Function types may be shared, so we can't just modify
1476 the return type of olddecl's function type. */
1478 = build_function_type (TREE_TYPE (oldtype),
1479 tree_cons (NULL_TREE,
1480 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1481 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1483 types_match = comptypes (newtype, trytype);
1487 if (! different_binding_level)
1488 TREE_TYPE (olddecl) = oldtype;
1494 /* If types don't match for a built-in, throw away the built-in. */
1495 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1499 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1500 && DECL_SOURCE_LINE (olddecl) == 0)
1502 /* A function declaration for a predeclared function
1503 that isn't actually built in. */
1504 if (!TREE_PUBLIC (newdecl))
1506 /* If you declare it as static, the
1507 default definition is overridden. */
1510 else if (!types_match)
1512 /* If the types don't match, preserve volatility indication.
1513 Later on, we will discard everything else about the
1514 default declaration. */
1515 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1518 /* Permit char *foo () to match void *foo (...) if not pedantic,
1519 if one of them came from a system header file. */
1520 else if (!types_match
1521 && TREE_CODE (olddecl) == FUNCTION_DECL
1522 && TREE_CODE (newdecl) == FUNCTION_DECL
1523 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1524 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1525 && (DECL_IN_SYSTEM_HEADER (olddecl)
1526 || DECL_IN_SYSTEM_HEADER (newdecl))
1527 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1528 && TYPE_ARG_TYPES (oldtype) == 0
1529 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1530 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1532 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1533 && TYPE_ARG_TYPES (newtype) == 0
1534 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1535 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1538 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1539 /* Make sure we keep void * as ret type, not char *. */
1540 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1541 TREE_TYPE (newdecl) = newtype = oldtype;
1543 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1544 we will come back here again. */
1545 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1547 else if (!types_match
1548 /* Permit char *foo (int, ...); followed by char *foo ();
1550 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1552 /* Return types must still match. */
1553 && comptypes (TREE_TYPE (oldtype),
1554 TREE_TYPE (newtype))
1555 && TYPE_ARG_TYPES (newtype) == 0))
1557 error_with_decl (newdecl, "conflicting types for `%s'");
1558 /* Check for function type mismatch
1559 involving an empty arglist vs a nonempty one. */
1560 if (TREE_CODE (olddecl) == FUNCTION_DECL
1561 && comptypes (TREE_TYPE (oldtype),
1562 TREE_TYPE (newtype))
1563 && ((TYPE_ARG_TYPES (oldtype) == 0
1564 && DECL_INITIAL (olddecl) == 0)
1566 (TYPE_ARG_TYPES (newtype) == 0
1567 && DECL_INITIAL (newdecl) == 0)))
1569 /* Classify the problem further. */
1570 register tree t = TYPE_ARG_TYPES (oldtype);
1572 t = TYPE_ARG_TYPES (newtype);
1573 for (; t; t = TREE_CHAIN (t))
1575 register tree type = TREE_VALUE (t);
1577 if (TREE_CHAIN (t) == 0
1578 && TYPE_MAIN_VARIANT (type) != void_type_node)
1580 error ("A parameter list with an ellipsis can't match");
1581 error ("an empty parameter name list declaration.");
1585 if (TYPE_MAIN_VARIANT (type) == float_type_node
1586 || C_PROMOTING_INTEGER_TYPE_P (type))
1588 error ("An argument type that has a default promotion");
1589 error ("can't match an empty parameter name list declaration.");
1594 error_with_decl (olddecl, "previous declaration of `%s'");
1598 errmsg = redeclaration_error_message (newdecl, olddecl);
1601 error_with_decl (newdecl, errmsg);
1602 error_with_decl (olddecl,
1603 ((DECL_INITIAL (olddecl)
1604 && current_binding_level == global_binding_level)
1605 ? "`%s' previously defined here"
1606 : "`%s' previously declared here"));
1608 else if (TREE_CODE (newdecl) == TYPE_DECL
1609 && (DECL_IN_SYSTEM_HEADER (olddecl)
1610 || DECL_IN_SYSTEM_HEADER (newdecl)))
1612 warning_with_decl (newdecl, "redefinition of `%s'");
1615 ((DECL_INITIAL (olddecl)
1616 && current_binding_level == global_binding_level)
1617 ? "`%s' previously defined here"
1618 : "`%s' previously declared here"));
1620 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1621 && DECL_INITIAL (olddecl) != 0
1622 && TYPE_ARG_TYPES (oldtype) == 0
1623 && TYPE_ARG_TYPES (newtype) != 0
1624 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1626 register tree type, parm;
1628 /* Prototype decl follows defn w/o prototype. */
1630 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1631 type = TYPE_ARG_TYPES (newtype),
1633 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1634 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1635 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1637 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1638 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1640 errmsg = "prototype for `%s' follows and number of arguments";
1643 /* Type for passing arg must be consistent
1644 with that declared for the arg. */
1645 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1646 /* If -traditional, allow `unsigned int' instead of `int'
1647 in the prototype. */
1648 && (! (flag_traditional
1649 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1650 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1652 errmsg = "prototype for `%s' follows and argument %d";
1658 error_with_decl (newdecl, errmsg, nargs);
1659 error_with_decl (olddecl,
1660 "doesn't match non-prototype definition here");
1664 warning_with_decl (newdecl, "prototype for `%s' follows");
1665 warning_with_decl (olddecl, "non-prototype definition here");
1668 /* Warn about mismatches in various flags. */
1671 /* Warn if function is now inline
1672 but was previously declared not inline and has been called. */
1673 if (TREE_CODE (olddecl) == FUNCTION_DECL
1674 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1675 && TREE_USED (olddecl))
1676 warning_with_decl (newdecl,
1677 "`%s' declared inline after being called");
1678 if (TREE_CODE (olddecl) == FUNCTION_DECL
1679 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1680 && DECL_INITIAL (olddecl) != 0)
1681 warning_with_decl (newdecl,
1682 "`%s' declared inline after its definition");
1684 /* If pedantic, warn when static declaration follows a non-static
1685 declaration. Otherwise, do so only for functions. */
1686 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1687 && TREE_PUBLIC (olddecl)
1688 && !TREE_PUBLIC (newdecl))
1689 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1691 /* Warn when const declaration follows a non-const
1692 declaration, but not for functions. */
1693 if (TREE_CODE (olddecl) != FUNCTION_DECL
1694 && !TREE_READONLY (olddecl)
1695 && TREE_READONLY (newdecl))
1696 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1697 /* These bits are logically part of the type, for variables.
1698 But not for functions
1699 (where qualifiers are not valid ANSI anyway). */
1700 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1701 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1702 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1703 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1707 /* Optionally warn about more than one declaration for the same name. */
1708 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1709 /* Dont warn about a function declaration
1710 followed by a definition. */
1711 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1712 && DECL_INITIAL (olddecl) == 0)
1713 /* Don't warn about extern decl followed by (tentative) definition. */
1714 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1716 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1717 warning_with_decl (olddecl, "previous declaration of `%s'");
1720 /* Copy all the DECL_... slots specified in the new decl
1721 except for any that we copy here from the old type.
1723 Past this point, we don't change OLDTYPE and NEWTYPE
1724 even if we change the types of NEWDECL and OLDDECL. */
1728 /* When copying info to olddecl, we store into write_olddecl
1729 instead. This allows us to avoid modifying olddecl when
1730 different_binding_level is true. */
1731 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1733 /* Make sure we put the new type in the same obstack as the old ones.
1734 If the old types are not both in the same obstack, use the permanent
1736 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1737 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1740 push_obstacks_nochange ();
1741 end_temporary_allocation ();
1744 /* Merge the data types specified in the two decls. */
1745 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1747 if (different_binding_level)
1749 = build_type_attribute_variant
1751 merge_attributes (TYPE_ATTRIBUTES (newtype),
1752 TYPE_ATTRIBUTES (oldtype)));
1755 = TREE_TYPE (olddecl)
1756 = common_type (newtype, oldtype);
1759 /* Lay the type out, unless already done. */
1760 if (oldtype != TREE_TYPE (newdecl))
1762 if (TREE_TYPE (newdecl) != error_mark_node)
1763 layout_type (TREE_TYPE (newdecl));
1764 if (TREE_CODE (newdecl) != FUNCTION_DECL
1765 && TREE_CODE (newdecl) != TYPE_DECL
1766 && TREE_CODE (newdecl) != CONST_DECL)
1767 layout_decl (newdecl, 0);
1771 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1772 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1773 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1774 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1775 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1778 /* Keep the old rtl since we can safely use it. */
1779 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1781 /* Merge the type qualifiers. */
1782 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1783 && !TREE_THIS_VOLATILE (newdecl))
1784 TREE_THIS_VOLATILE (write_olddecl) = 0;
1785 if (TREE_READONLY (newdecl))
1786 TREE_READONLY (write_olddecl) = 1;
1787 if (TREE_THIS_VOLATILE (newdecl))
1789 TREE_THIS_VOLATILE (write_olddecl) = 1;
1790 if (TREE_CODE (newdecl) == VAR_DECL)
1791 make_var_volatile (newdecl);
1794 /* Keep source location of definition rather than declaration. */
1795 /* When called with different_binding_level set, keep the old
1796 information so that meaningful diagnostics can be given. */
1797 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1798 && ! different_binding_level)
1800 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1801 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1804 /* Merge the unused-warning information. */
1805 if (DECL_IN_SYSTEM_HEADER (olddecl))
1806 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1807 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1808 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1810 /* Merge the initialization information. */
1811 /* When called with different_binding_level set, don't copy over
1812 DECL_INITIAL, so that we don't accidentally change function
1813 declarations into function definitions. */
1814 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1815 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1817 /* Merge the section attribute.
1818 We want to issue an error if the sections conflict but that must be
1819 done later in decl_attributes since we are called before attributes
1821 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1822 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1824 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1826 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1827 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1832 /* If cannot merge, then use the new type and qualifiers,
1833 and don't preserve the old rtl. */
1834 else if (! different_binding_level)
1836 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1837 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1838 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1839 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1842 /* Merge the storage class information. */
1843 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1844 /* For functions, static overrides non-static. */
1845 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1847 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1848 /* This is since we don't automatically
1849 copy the attributes of NEWDECL into OLDDECL. */
1850 /* No need to worry about different_binding_level here because
1851 then TREE_PUBLIC (newdecl) was true. */
1852 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1853 /* If this clears `static', clear it in the identifier too. */
1854 if (! TREE_PUBLIC (olddecl))
1855 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1857 if (DECL_EXTERNAL (newdecl))
1859 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1860 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1861 /* An extern decl does not override previous storage class. */
1862 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1863 if (! DECL_EXTERNAL (newdecl))
1864 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1868 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1869 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1872 /* If either decl says `inline', this fn is inline,
1873 unless its definition was passed already. */
1874 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1875 DECL_INLINE (olddecl) = 1;
1876 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1878 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1880 if (DECL_BUILT_IN (olddecl))
1882 /* Get rid of any built-in function if new arg types don't match it
1883 or if we have a function definition. */
1884 if (! types_match || new_is_definition)
1886 if (! different_binding_level)
1888 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1889 DECL_BUILT_IN (olddecl) = 0;
1894 /* If redeclaring a builtin function, and not a definition,
1895 it stays built in. */
1896 DECL_BUILT_IN (newdecl) = 1;
1897 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1900 /* Also preserve various other info from the definition. */
1901 else if (! new_is_definition)
1902 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1903 if (! new_is_definition)
1905 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1906 /* When called with different_binding_level set, don't copy over
1907 DECL_INITIAL, so that we don't accidentally change function
1908 declarations into function definitions. */
1909 if (! different_binding_level)
1910 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1911 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1912 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1915 if (different_binding_level)
1917 /* Don't output a duplicate symbol for this declaration. */
1918 TREE_ASM_WRITTEN (newdecl) = 1;
1922 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1923 But preserve OLDdECL's DECL_UID. */
1925 register unsigned olddecl_uid = DECL_UID (olddecl);
1927 bcopy ((char *) newdecl + sizeof (struct tree_common),
1928 (char *) olddecl + sizeof (struct tree_common),
1929 sizeof (struct tree_decl) - sizeof (struct tree_common));
1930 DECL_UID (olddecl) = olddecl_uid;
1936 /* Record a decl-node X as belonging to the current lexical scope.
1937 Check for errors (such as an incompatible declaration for the same
1938 name already seen in the same scope).
1940 Returns either X or an old decl for the same name.
1941 If an old decl is returned, it may have been smashed
1942 to agree with what X says. */
1949 register tree name = DECL_NAME (x);
1950 register struct binding_level *b = current_binding_level;
1952 DECL_CONTEXT (x) = current_function_decl;
1953 /* A local extern declaration for a function doesn't constitute nesting.
1954 A local auto declaration does, since it's a forward decl
1955 for a nested function coming later. */
1956 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1957 && DECL_EXTERNAL (x))
1958 DECL_CONTEXT (x) = 0;
1960 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1961 && x != IDENTIFIER_IMPLICIT_DECL (name)
1962 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1963 && !DECL_IN_SYSTEM_HEADER (x))
1964 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1970 int different_binding_level = 0;
1972 t = lookup_name_current_level (name);
1973 /* Don't type check externs here when -traditional. This is so that
1974 code with conflicting declarations inside blocks will get warnings
1975 not errors. X11 for instance depends on this. */
1976 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
1978 t = IDENTIFIER_GLOBAL_VALUE (name);
1979 /* Type decls at global scope don't conflict with externs declared
1980 inside lexical blocks. */
1981 if (t && TREE_CODE (t) == TYPE_DECL)
1983 different_binding_level = 1;
1985 if (t != 0 && t == error_mark_node)
1986 /* error_mark_node is 0 for a while during initialization! */
1989 error_with_decl (x, "`%s' used prior to declaration");
1994 file = DECL_SOURCE_FILE (t);
1995 line = DECL_SOURCE_LINE (t);
1998 /* If this decl is `static' and an implicit decl was seen previously,
1999 warn. But don't complain if -traditional,
2000 since traditional compilers don't complain. */
2001 if (! flag_traditional && TREE_PUBLIC (name)
2002 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2003 sets this for all functions. */
2004 && ! TREE_PUBLIC (x)
2005 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2006 /* We used to warn also for explicit extern followed by static,
2007 but sometimes you need to do it that way. */
2008 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2010 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2011 IDENTIFIER_POINTER (name));
2012 pedwarn_with_file_and_line
2013 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2014 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2015 "previous declaration of `%s'",
2016 IDENTIFIER_POINTER (name));
2019 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2021 if (TREE_CODE (t) == PARM_DECL)
2023 /* Don't allow more than one "real" duplicate
2024 of a forward parm decl. */
2025 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2031 /* If we are processing a typedef statement, generate a whole new
2032 ..._TYPE node (which will be just an variant of the existing
2033 ..._TYPE node with identical properties) and then install the
2034 TYPE_DECL node generated to represent the typedef name as the
2035 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2037 The whole point here is to end up with a situation where each
2038 and every ..._TYPE node the compiler creates will be uniquely
2039 associated with AT MOST one node representing a typedef name.
2040 This way, even though the compiler substitutes corresponding
2041 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2042 early on, later parts of the compiler can always do the reverse
2043 translation and get back the corresponding typedef name. For
2046 typedef struct S MY_TYPE;
2049 Later parts of the compiler might only know that `object' was of
2050 type `struct S' if if were not for code just below. With this
2051 code however, later parts of the compiler see something like:
2053 struct S' == struct S
2054 typedef struct S' MY_TYPE;
2057 And they can then deduce (from the node for type struct S') that
2058 the original object declaration was:
2062 Being able to do this is important for proper support of protoize,
2063 and also for generating precise symbolic debugging information
2064 which takes full account of the programmer's (typedef) vocabulary.
2066 Obviously, we don't want to generate a duplicate ..._TYPE node if
2067 the TYPE_DECL node that we are now processing really represents a
2068 standard built-in type.
2070 Since all standard types are effectively declared at line zero
2071 in the source file, we can easily check to see if we are working
2072 on a standard type by checking the current value of lineno. */
2074 if (TREE_CODE (x) == TYPE_DECL)
2076 if (DECL_SOURCE_LINE (x) == 0)
2078 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2079 TYPE_NAME (TREE_TYPE (x)) = x;
2081 else if (TREE_TYPE (x) != error_mark_node)
2083 tree tt = TREE_TYPE (x);
2084 DECL_ORIGINAL_TYPE (x) = tt;
2085 tt = build_type_copy (tt);
2091 /* Multiple external decls of the same identifier ought to match.
2092 Check against both global declarations (when traditional) and out of
2093 scope (limbo) block level declarations.
2095 We get warnings about inline functions where they are defined.
2096 Avoid duplicate warnings where they are used. */
2097 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2101 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2102 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2103 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2104 decl = IDENTIFIER_GLOBAL_VALUE (name);
2105 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2106 /* Decls in limbo are always extern, so no need to check that. */
2107 decl = IDENTIFIER_LIMBO_VALUE (name);
2111 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2112 /* If old decl is built-in, we already warned if we should. */
2113 && !DECL_BUILT_IN (decl))
2115 pedwarn_with_decl (x,
2116 "type mismatch with previous external decl");
2117 pedwarn_with_decl (decl, "previous external decl of `%s'");
2121 /* If a function has had an implicit declaration, and then is defined,
2122 make sure they are compatible. */
2124 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2125 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2126 && TREE_CODE (x) == FUNCTION_DECL
2127 && ! comptypes (TREE_TYPE (x),
2128 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2130 warning_with_decl (x, "type mismatch with previous implicit declaration");
2131 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2132 "previous implicit declaration of `%s'");
2135 /* In PCC-compatibility mode, extern decls of vars with no current decl
2136 take effect at top level no matter where they are. */
2137 if (flag_traditional && DECL_EXTERNAL (x)
2138 && lookup_name (name) == 0)
2140 tree type = TREE_TYPE (x);
2142 /* But don't do this if the type contains temporary nodes. */
2145 if (type == error_mark_node)
2147 if (! TREE_PERMANENT (type))
2149 warning_with_decl (x, "type of external `%s' is not global");
2150 /* By exiting the loop early, we leave TYPE nonzero,
2151 and thus prevent globalization of the decl. */
2154 else if (TREE_CODE (type) == FUNCTION_TYPE
2155 && TYPE_ARG_TYPES (type) != 0)
2156 /* The types might not be truly local,
2157 but the list of arg types certainly is temporary.
2158 Since prototypes are nontraditional,
2159 ok not to do the traditional thing. */
2161 type = TREE_TYPE (type);
2165 b = global_binding_level;
2168 /* This name is new in its binding level.
2169 Install the new declaration and return it. */
2170 if (b == global_binding_level)
2172 /* Install a global value. */
2174 /* If the first global decl has external linkage,
2175 warn if we later see static one. */
2176 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2177 TREE_PUBLIC (name) = 1;
2179 IDENTIFIER_GLOBAL_VALUE (name) = x;
2181 /* We no longer care about any previous block level declarations. */
2182 IDENTIFIER_LIMBO_VALUE (name) = 0;
2184 /* Don't forget if the function was used via an implicit decl. */
2185 if (IDENTIFIER_IMPLICIT_DECL (name)
2186 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2187 TREE_USED (x) = 1, TREE_USED (name) = 1;
2189 /* Don't forget if its address was taken in that way. */
2190 if (IDENTIFIER_IMPLICIT_DECL (name)
2191 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2192 TREE_ADDRESSABLE (x) = 1;
2194 /* Warn about mismatches against previous implicit decl. */
2195 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2196 /* If this real decl matches the implicit, don't complain. */
2197 && ! (TREE_CODE (x) == FUNCTION_DECL
2198 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2199 == integer_type_node)))
2200 pedwarn ("`%s' was previously implicitly declared to return `int'",
2201 IDENTIFIER_POINTER (name));
2203 /* If this decl is `static' and an `extern' was seen previously,
2204 that is erroneous. */
2205 if (TREE_PUBLIC (name)
2206 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2208 /* Okay to redeclare an ANSI built-in as static. */
2209 if (t != 0 && DECL_BUILT_IN (t))
2211 /* Okay to declare a non-ANSI built-in as anything. */
2212 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2214 /* Okay to have global type decl after an earlier extern
2215 declaration inside a lexical block. */
2216 else if (TREE_CODE (x) == TYPE_DECL)
2218 else if (IDENTIFIER_IMPLICIT_DECL (name))
2219 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2220 IDENTIFIER_POINTER (name));
2222 pedwarn ("`%s' was declared `extern' and later `static'",
2223 IDENTIFIER_POINTER (name));
2228 /* Here to install a non-global value. */
2229 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2230 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2231 IDENTIFIER_LOCAL_VALUE (name) = x;
2233 /* If this is an extern function declaration, see if we
2234 have a global definition or declaration for the function. */
2236 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2238 && TREE_CODE (x) == FUNCTION_DECL
2239 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2241 /* We have one. Their types must agree. */
2242 if (! comptypes (TREE_TYPE (x),
2243 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2244 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2247 /* Inner extern decl is inline if global one is.
2248 Copy enough to really inline it. */
2249 if (DECL_INLINE (oldglobal))
2251 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2252 DECL_INITIAL (x) = (current_function_decl == oldglobal
2253 ? 0 : DECL_INITIAL (oldglobal));
2254 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2255 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2256 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2257 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2258 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2259 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2261 /* Inner extern decl is built-in if global one is. */
2262 if (DECL_BUILT_IN (oldglobal))
2264 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2265 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2267 /* Keep the arg types from a file-scope fcn defn. */
2268 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2269 && DECL_INITIAL (oldglobal)
2270 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2271 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2275 #if 0 /* This case is probably sometimes the right thing to do. */
2276 /* If we have a local external declaration,
2277 then any file-scope declaration should not
2278 have been static. */
2279 if (oldlocal == 0 && oldglobal != 0
2280 && !TREE_PUBLIC (oldglobal)
2281 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2282 warning ("`%s' locally external but globally static",
2283 IDENTIFIER_POINTER (name));
2286 /* If we have a local external declaration,
2287 and no file-scope declaration has yet been seen,
2288 then if we later have a file-scope decl it must not be static. */
2290 && DECL_EXTERNAL (x)
2294 TREE_PUBLIC (name) = 1;
2296 /* Save this decl, so that we can do type checking against
2297 other decls after it falls out of scope.
2299 Only save it once. This prevents temporary decls created in
2300 expand_inline_function from being used here, since this
2301 will have been set when the inline function was parsed.
2302 It also helps give slightly better warnings. */
2303 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2304 IDENTIFIER_LIMBO_VALUE (name) = x;
2307 /* Warn if shadowing an argument at the top level of the body. */
2308 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2309 /* This warning doesn't apply to the parms of a nested fcn. */
2310 && ! current_binding_level->parm_flag
2311 /* Check that this is one level down from the parms. */
2312 && current_binding_level->level_chain->parm_flag
2313 /* Check that the decl being shadowed
2314 comes from the parm level, one level up. */
2315 && chain_member (oldlocal, current_binding_level->level_chain->names))
2317 if (TREE_CODE (oldlocal) == PARM_DECL)
2318 pedwarn ("declaration of `%s' shadows a parameter",
2319 IDENTIFIER_POINTER (name));
2321 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2322 IDENTIFIER_POINTER (name));
2325 /* Maybe warn if shadowing something else. */
2326 else if (warn_shadow && !DECL_EXTERNAL (x)
2327 /* No shadow warnings for internally generated vars. */
2328 && DECL_SOURCE_LINE (x) != 0
2329 /* No shadow warnings for vars made for inlining. */
2330 && ! DECL_FROM_INLINE (x))
2332 char *warnstring = 0;
2334 if (TREE_CODE (x) == PARM_DECL
2335 && current_binding_level->level_chain->parm_flag)
2336 /* Don't warn about the parm names in function declarator
2337 within a function declarator.
2338 It would be nice to avoid warning in any function
2339 declarator in a declaration, as opposed to a definition,
2340 but there is no way to tell it's not a definition. */
2342 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2343 warnstring = "declaration of `%s' shadows a parameter";
2344 else if (oldlocal != 0)
2345 warnstring = "declaration of `%s' shadows previous local";
2346 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2347 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2348 warnstring = "declaration of `%s' shadows global declaration";
2351 warning (warnstring, IDENTIFIER_POINTER (name));
2354 /* If storing a local value, there may already be one (inherited).
2355 If so, record it for restoration when this binding level ends. */
2357 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2360 /* Keep count of variables in this level with incomplete type. */
2361 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2365 /* Put decls on list in reverse order.
2366 We will reverse them later if necessary. */
2367 TREE_CHAIN (x) = b->names;
2373 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2376 pushdecl_top_level (x)
2380 register struct binding_level *b = current_binding_level;
2382 current_binding_level = global_binding_level;
2384 current_binding_level = b;
2388 /* Generate an implicit declaration for identifier FUNCTIONID
2389 as a function of type int (). Print a warning if appropriate. */
2392 implicitly_declare (functionid)
2396 int traditional_warning = 0;
2397 /* Only one "implicit declaration" warning per identifier. */
2398 int implicit_warning;
2400 /* Save the decl permanently so we can warn if definition follows. */
2401 push_obstacks_nochange ();
2402 end_temporary_allocation ();
2404 /* We used to reuse an old implicit decl here,
2405 but this loses with inline functions because it can clobber
2406 the saved decl chains. */
2407 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2408 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2410 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2412 /* Warn of implicit decl following explicit local extern decl.
2413 This is probably a program designed for traditional C. */
2414 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2415 traditional_warning = 1;
2417 /* Warn once of an implicit declaration. */
2418 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2420 DECL_EXTERNAL (decl) = 1;
2421 TREE_PUBLIC (decl) = 1;
2422 DECL_ARTIFICIAL (decl);
2424 /* Record that we have an implicit decl and this is it. */
2425 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2427 /* ANSI standard says implicit declarations are in the innermost block.
2428 So we record the decl in the standard fashion.
2429 If flag_traditional is set, pushdecl does it top-level. */
2432 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2433 maybe_objc_check_decl (decl);
2435 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2437 if (warn_implicit && implicit_warning)
2438 warning ("implicit declaration of function `%s'",
2439 IDENTIFIER_POINTER (functionid));
2440 else if (warn_traditional && traditional_warning)
2441 warning ("function `%s' was previously declared within a block",
2442 IDENTIFIER_POINTER (functionid));
2444 /* Write a record describing this implicit function declaration to the
2445 prototypes file (if requested). */
2447 gen_aux_info_record (decl, 0, 1, 0);
2454 /* Return zero if the declaration NEWDECL is valid
2455 when the declaration OLDDECL (assumed to be for the same name)
2456 has already been seen.
2457 Otherwise return an error message format string with a %s
2458 where the identifier should go. */
2461 redeclaration_error_message (newdecl, olddecl)
2462 tree newdecl, olddecl;
2464 if (TREE_CODE (newdecl) == TYPE_DECL)
2466 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2468 /* pushdecl creates distinct types for TYPE_DECLs by calling
2469 build_type_copy, so the above comparison generally fails. We do
2470 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2471 is equivalent to what this code used to do before the build_type_copy
2472 call. The variant type distinction should not matter for traditional
2473 code, because it doesn't have type qualifiers. */
2474 if (flag_traditional
2475 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2477 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2479 return "redefinition of `%s'";
2481 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2483 /* Declarations of functions can insist on internal linkage
2484 but they can't be inconsistent with internal linkage,
2485 so there can be no error on that account.
2486 However defining the same name twice is no good. */
2487 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2488 /* However, defining once as extern inline and a second
2489 time in another way is ok. */
2490 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2491 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2492 return "redefinition of `%s'";
2495 else if (current_binding_level == global_binding_level)
2497 /* Objects declared at top level: */
2498 /* If at least one is a reference, it's ok. */
2499 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2501 /* Reject two definitions. */
2502 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2503 return "redefinition of `%s'";
2504 /* Now we have two tentative defs, or one tentative and one real def. */
2505 /* Insist that the linkage match. */
2506 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2507 return "conflicting declarations of `%s'";
2510 else if (current_binding_level->parm_flag
2511 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2515 /* Newdecl has block scope. If olddecl has block scope also, then
2516 reject two definitions, and reject a definition together with an
2517 external reference. Otherwise, it is OK, because newdecl must
2518 be an extern reference to olddecl. */
2519 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2520 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2521 return "redeclaration of `%s'";
2526 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2527 Create one if none exists so far for the current function.
2528 This function is called for both label definitions and label references. */
2534 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2536 if (current_function_decl == 0)
2538 error ("label %s referenced outside of any function",
2539 IDENTIFIER_POINTER (id));
2543 /* Use a label already defined or ref'd with this name. */
2546 /* But not if it is inherited and wasn't declared to be inheritable. */
2547 if (DECL_CONTEXT (decl) != current_function_decl
2548 && ! C_DECLARED_LABEL_FLAG (decl))
2549 return shadow_label (id);
2553 decl = build_decl (LABEL_DECL, id, void_type_node);
2555 /* Make sure every label has an rtx. */
2558 /* A label not explicitly declared must be local to where it's ref'd. */
2559 DECL_CONTEXT (decl) = current_function_decl;
2561 DECL_MODE (decl) = VOIDmode;
2563 /* Say where one reference is to the label,
2564 for the sake of the error if it is not defined. */
2565 DECL_SOURCE_LINE (decl) = lineno;
2566 DECL_SOURCE_FILE (decl) = input_filename;
2568 IDENTIFIER_LABEL_VALUE (id) = decl;
2570 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2575 /* Make a label named NAME in the current function,
2576 shadowing silently any that may be inherited from containing functions
2577 or containing scopes.
2579 Note that valid use, if the label being shadowed
2580 comes from another scope in the same function,
2581 requires calling declare_nonlocal_label right away. */
2587 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2593 /* Check to make sure that the label hasn't already been declared
2594 at this label scope */
2595 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2596 if (TREE_VALUE (dup) == decl)
2598 error ("duplicate label declaration `%s'",
2599 IDENTIFIER_POINTER (name));
2600 error_with_decl (TREE_VALUE (dup),
2601 "this is a previous declaration");
2602 /* Just use the previous declaration. */
2603 return lookup_label (name);
2606 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2607 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2610 return lookup_label (name);
2613 /* Define a label, specifying the location in the source file.
2614 Return the LABEL_DECL node for the label, if the definition is valid.
2615 Otherwise return 0. */
2618 define_label (filename, line, name)
2623 tree decl = lookup_label (name);
2625 /* If label with this name is known from an outer context, shadow it. */
2626 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2628 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2629 IDENTIFIER_LABEL_VALUE (name) = 0;
2630 decl = lookup_label (name);
2633 if (DECL_INITIAL (decl) != 0)
2635 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2640 /* Mark label as having been defined. */
2641 DECL_INITIAL (decl) = error_mark_node;
2642 /* Say where in the source. */
2643 DECL_SOURCE_FILE (decl) = filename;
2644 DECL_SOURCE_LINE (decl) = line;
2649 /* Return the list of declarations of the current level.
2650 Note that this list is in reverse order unless/until
2651 you nreverse it; and when you do nreverse it, you must
2652 store the result back using `storedecls' or you will lose. */
2657 return current_binding_level->names;
2660 /* Return the list of type-tags (for structs, etc) of the current level. */
2665 return current_binding_level->tags;
2668 /* Store the list of declarations of the current level.
2669 This is done for the parameter declarations of a function being defined,
2670 after they are modified in the light of any missing parameters. */
2676 current_binding_level->names = decls;
2679 /* Similarly, store the list of tags of the current level. */
2685 current_binding_level->tags = tags;
2688 /* Given NAME, an IDENTIFIER_NODE,
2689 return the structure (or union or enum) definition for that name.
2690 Searches binding levels from BINDING_LEVEL up to the global level.
2691 If THISLEVEL_ONLY is nonzero, searches only the specified context
2692 (but skips any tag-transparent contexts to find one that is
2693 meaningful for tags).
2694 CODE says which kind of type the caller wants;
2695 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2696 If the wrong kind of type is found, an error is reported. */
2699 lookup_tag (code, name, binding_level, thislevel_only)
2700 enum tree_code code;
2701 struct binding_level *binding_level;
2705 register struct binding_level *level;
2707 for (level = binding_level; level; level = level->level_chain)
2710 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2712 if (TREE_PURPOSE (tail) == name)
2714 if (TREE_CODE (TREE_VALUE (tail)) != code)
2716 /* Definition isn't the kind we were looking for. */
2717 pending_invalid_xref = name;
2718 pending_invalid_xref_file = input_filename;
2719 pending_invalid_xref_line = lineno;
2721 return TREE_VALUE (tail);
2724 if (thislevel_only && ! level->tag_transparent)
2730 /* Print an error message now
2731 for a recent invalid struct, union or enum cross reference.
2732 We don't print them immediately because they are not invalid
2733 when used in the `struct foo;' construct for shadowing. */
2736 pending_xref_error ()
2738 if (pending_invalid_xref != 0)
2739 error_with_file_and_line (pending_invalid_xref_file,
2740 pending_invalid_xref_line,
2741 "`%s' defined as wrong kind of tag",
2742 IDENTIFIER_POINTER (pending_invalid_xref));
2743 pending_invalid_xref = 0;
2746 /* Given a type, find the tag that was defined for it and return the tag name.
2747 Otherwise return 0. */
2750 lookup_tag_reverse (type)
2753 register struct binding_level *level;
2755 for (level = current_binding_level; level; level = level->level_chain)
2758 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2760 if (TREE_VALUE (tail) == type)
2761 return TREE_PURPOSE (tail);
2767 /* Look up NAME in the current binding level and its superiors
2768 in the namespace of variables, functions and typedefs.
2769 Return a ..._DECL node of some kind representing its definition,
2770 or return 0 if it is undefined. */
2777 if (current_binding_level != global_binding_level
2778 && IDENTIFIER_LOCAL_VALUE (name))
2779 val = IDENTIFIER_LOCAL_VALUE (name);
2781 val = IDENTIFIER_GLOBAL_VALUE (name);
2785 /* Similar to `lookup_name' but look only at current binding level. */
2788 lookup_name_current_level (name)
2793 if (current_binding_level == global_binding_level)
2794 return IDENTIFIER_GLOBAL_VALUE (name);
2796 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2799 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2800 if (DECL_NAME (t) == name)
2806 /* Create the predefined scalar types of C,
2807 and some nodes representing standard constants (0, 1, (void *) 0).
2808 Initialize the global binding level.
2809 Make definitions for built-in primitive functions. */
2812 init_decl_processing ()
2814 register tree endlink;
2815 /* Either char* or void*. */
2816 tree traditional_ptr_type_node;
2817 /* Data types of memcpy and strlen. */
2818 tree memcpy_ftype, memset_ftype, strlen_ftype;
2819 tree void_ftype_any;
2820 int wchar_type_size;
2822 tree array_domain_type;
2824 current_function_decl = NULL;
2825 named_labels = NULL;
2826 current_binding_level = NULL_BINDING_LEVEL;
2827 free_binding_level = NULL_BINDING_LEVEL;
2828 pushlevel (0); /* make the binding_level structure for global names */
2829 global_binding_level = current_binding_level;
2831 /* Define `int' and `char' first so that dbx will output them first. */
2833 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2834 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2835 integer_type_node));
2837 /* Define `char', which is like either `signed char' or `unsigned char'
2838 but not the same as either. */
2842 ? make_signed_type (CHAR_TYPE_SIZE)
2843 : make_unsigned_type (CHAR_TYPE_SIZE));
2844 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2847 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2848 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2849 long_integer_type_node));
2851 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2852 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2853 unsigned_type_node));
2855 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2856 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2857 long_unsigned_type_node));
2859 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2860 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2861 long_long_integer_type_node));
2863 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2864 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2865 long_long_unsigned_type_node));
2867 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2868 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2869 short_integer_type_node));
2871 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2872 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2873 short_unsigned_type_node));
2875 /* `unsigned long' is the standard type for sizeof.
2876 Traditionally, use a signed type.
2877 Note that stddef.h uses `unsigned long',
2878 and this must agree, even of long and int are the same size. */
2880 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2881 if (flag_traditional && TREE_UNSIGNED (sizetype))
2882 sizetype = signed_type (sizetype);
2885 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2887 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2888 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2889 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2890 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2891 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2892 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2893 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2894 TREE_TYPE (TYPE_SIZE (short_integer_type_node)) = sizetype;
2895 TREE_TYPE (TYPE_SIZE (short_unsigned_type_node)) = sizetype;
2897 error_mark_node = make_node (ERROR_MARK);
2898 TREE_TYPE (error_mark_node) = error_mark_node;
2900 /* Define both `signed char' and `unsigned char'. */
2901 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2902 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2903 signed_char_type_node));
2905 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2906 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2907 unsigned_char_type_node));
2909 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2910 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2912 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2913 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2915 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2916 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2918 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2919 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2921 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2922 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2924 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2925 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2927 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2928 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2930 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2931 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2933 float_type_node = make_node (REAL_TYPE);
2934 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2935 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2937 layout_type (float_type_node);
2939 double_type_node = make_node (REAL_TYPE);
2940 if (flag_short_double)
2941 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2943 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2944 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2946 layout_type (double_type_node);
2948 long_double_type_node = make_node (REAL_TYPE);
2949 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2950 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2951 long_double_type_node));
2952 layout_type (long_double_type_node);
2954 complex_integer_type_node = make_node (COMPLEX_TYPE);
2955 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2956 complex_integer_type_node));
2957 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2958 layout_type (complex_integer_type_node);
2960 complex_float_type_node = make_node (COMPLEX_TYPE);
2961 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2962 complex_float_type_node));
2963 TREE_TYPE (complex_float_type_node) = float_type_node;
2964 layout_type (complex_float_type_node);
2966 complex_double_type_node = make_node (COMPLEX_TYPE);
2967 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2968 complex_double_type_node));
2969 TREE_TYPE (complex_double_type_node) = double_type_node;
2970 layout_type (complex_double_type_node);
2972 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2973 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2974 complex_long_double_type_node));
2975 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2976 layout_type (complex_long_double_type_node);
2979 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2980 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2981 signed_wchar_type_node = signed_type (wchar_type_node);
2982 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2984 integer_zero_node = build_int_2 (0, 0);
2985 TREE_TYPE (integer_zero_node) = integer_type_node;
2986 integer_one_node = build_int_2 (1, 0);
2987 TREE_TYPE (integer_one_node) = integer_type_node;
2989 boolean_type_node = integer_type_node;
2990 boolean_true_node = integer_one_node;
2991 boolean_false_node = integer_zero_node;
2993 size_zero_node = build_int_2 (0, 0);
2994 TREE_TYPE (size_zero_node) = sizetype;
2995 size_one_node = build_int_2 (1, 0);
2996 TREE_TYPE (size_one_node) = sizetype;
2998 void_type_node = make_node (VOID_TYPE);
2999 pushdecl (build_decl (TYPE_DECL,
3000 ridpointers[(int) RID_VOID], void_type_node));
3001 layout_type (void_type_node); /* Uses integer_zero_node */
3002 /* We are not going to have real types in C with less than byte alignment,
3003 so we might as well not have any types that claim to have it. */
3004 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3006 null_pointer_node = build_int_2 (0, 0);
3007 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3008 layout_type (TREE_TYPE (null_pointer_node));
3010 string_type_node = build_pointer_type (char_type_node);
3011 const_string_type_node
3012 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3014 /* Make a type to be the domain of a few array types
3015 whose domains don't really matter.
3016 200 is small enough that it always fits in size_t
3017 and large enough that it can hold most function names for the
3018 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3019 array_domain_type = build_index_type (build_int_2 (200, 0));
3021 /* make a type for arrays of characters.
3022 With luck nothing will ever really depend on the length of this
3024 char_array_type_node
3025 = build_array_type (char_type_node, array_domain_type);
3026 /* Likewise for arrays of ints. */
3028 = build_array_type (integer_type_node, array_domain_type);
3029 /* This is for wide string constants. */
3030 wchar_array_type_node
3031 = build_array_type (wchar_type_node, array_domain_type);
3033 default_function_type
3034 = build_function_type (integer_type_node, NULL_TREE);
3036 ptr_type_node = build_pointer_type (void_type_node);
3038 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3040 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3043 = build_function_type (void_type_node, NULL_TREE);
3046 = build_function_type (float_type_node,
3047 tree_cons (NULL_TREE, float_type_node, endlink));
3050 = build_function_type (double_type_node,
3051 tree_cons (NULL_TREE, double_type_node, endlink));
3053 ldouble_ftype_ldouble
3054 = build_function_type (long_double_type_node,
3055 tree_cons (NULL_TREE, long_double_type_node,
3058 double_ftype_double_double
3059 = build_function_type (double_type_node,
3060 tree_cons (NULL_TREE, double_type_node,
3061 tree_cons (NULL_TREE,
3062 double_type_node, endlink)));
3065 = build_function_type (integer_type_node,
3066 tree_cons (NULL_TREE, integer_type_node, endlink));
3069 = build_function_type (long_integer_type_node,
3070 tree_cons (NULL_TREE,
3071 long_integer_type_node, endlink));
3073 void_ftype_ptr_ptr_int
3074 = build_function_type (void_type_node,
3075 tree_cons (NULL_TREE, ptr_type_node,
3076 tree_cons (NULL_TREE, ptr_type_node,
3077 tree_cons (NULL_TREE,
3081 int_ftype_cptr_cptr_sizet
3082 = build_function_type (integer_type_node,
3083 tree_cons (NULL_TREE, const_ptr_type_node,
3084 tree_cons (NULL_TREE, const_ptr_type_node,
3085 tree_cons (NULL_TREE,
3089 void_ftype_ptr_int_int
3090 = build_function_type (void_type_node,
3091 tree_cons (NULL_TREE, ptr_type_node,
3092 tree_cons (NULL_TREE, integer_type_node,
3093 tree_cons (NULL_TREE,
3097 string_ftype_ptr_ptr /* strcpy prototype */
3098 = build_function_type (string_type_node,
3099 tree_cons (NULL_TREE, string_type_node,
3100 tree_cons (NULL_TREE,
3101 const_string_type_node,
3104 int_ftype_string_string /* strcmp prototype */
3105 = build_function_type (integer_type_node,
3106 tree_cons (NULL_TREE, const_string_type_node,
3107 tree_cons (NULL_TREE,
3108 const_string_type_node,
3111 strlen_ftype /* strlen prototype */
3112 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3113 tree_cons (NULL_TREE, const_string_type_node,
3116 traditional_ptr_type_node
3117 = (flag_traditional ? string_type_node : ptr_type_node);
3119 memcpy_ftype /* memcpy prototype */
3120 = build_function_type (traditional_ptr_type_node,
3121 tree_cons (NULL_TREE, ptr_type_node,
3122 tree_cons (NULL_TREE, const_ptr_type_node,
3123 tree_cons (NULL_TREE,
3127 memset_ftype /* memset prototype */
3128 = build_function_type (traditional_ptr_type_node,
3129 tree_cons (NULL_TREE, ptr_type_node,
3130 tree_cons (NULL_TREE, integer_type_node,
3131 tree_cons (NULL_TREE,
3135 builtin_function ("__builtin_constant_p", default_function_type,
3136 BUILT_IN_CONSTANT_P, NULL_PTR);
3138 builtin_function ("__builtin_return_address",
3139 build_function_type (ptr_type_node,
3140 tree_cons (NULL_TREE,
3143 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3145 builtin_function ("__builtin_frame_address",
3146 build_function_type (ptr_type_node,
3147 tree_cons (NULL_TREE,
3150 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3152 builtin_function ("__builtin_alloca",
3153 build_function_type (ptr_type_node,
3154 tree_cons (NULL_TREE,
3157 BUILT_IN_ALLOCA, "alloca");
3158 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3159 /* Define alloca, ffs as builtins.
3160 Declare _exit just to mark it as volatile. */
3161 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3163 temp = builtin_function ("alloca",
3164 build_function_type (ptr_type_node,
3165 tree_cons (NULL_TREE,
3168 BUILT_IN_ALLOCA, NULL_PTR);
3169 /* Suppress error if redefined as a non-function. */
3170 DECL_BUILT_IN_NONANSI (temp) = 1;
3171 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3172 /* Suppress error if redefined as a non-function. */
3173 DECL_BUILT_IN_NONANSI (temp) = 1;
3174 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3176 TREE_THIS_VOLATILE (temp) = 1;
3177 TREE_SIDE_EFFECTS (temp) = 1;
3178 /* Suppress error if redefined as a non-function. */
3179 DECL_BUILT_IN_NONANSI (temp) = 1;
3182 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3183 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3185 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3187 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3189 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3191 builtin_function ("__builtin_saveregs",
3192 build_function_type (ptr_type_node, NULL_TREE),
3193 BUILT_IN_SAVEREGS, NULL_PTR);
3194 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3196 builtin_function ("__builtin_varargs",
3197 build_function_type (ptr_type_node,
3198 tree_cons (NULL_TREE,
3201 BUILT_IN_VARARGS, NULL_PTR);
3203 builtin_function ("__builtin_classify_type", default_function_type,
3204 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3205 builtin_function ("__builtin_next_arg",
3206 build_function_type (ptr_type_node, NULL_TREE),
3207 BUILT_IN_NEXT_ARG, NULL_PTR);
3208 builtin_function ("__builtin_args_info",
3209 build_function_type (integer_type_node,
3210 tree_cons (NULL_TREE,
3213 BUILT_IN_ARGS_INFO, NULL_PTR);
3215 /* Untyped call and return. */
3216 builtin_function ("__builtin_apply_args",
3217 build_function_type (ptr_type_node, NULL_TREE),
3218 BUILT_IN_APPLY_ARGS, NULL_PTR);
3220 temp = tree_cons (NULL_TREE,
3221 build_pointer_type (build_function_type (void_type_node,
3223 tree_cons (NULL_TREE,
3225 tree_cons (NULL_TREE,
3228 builtin_function ("__builtin_apply",
3229 build_function_type (ptr_type_node, temp),
3230 BUILT_IN_APPLY, NULL_PTR);
3231 builtin_function ("__builtin_return",
3232 build_function_type (void_type_node,
3233 tree_cons (NULL_TREE,
3236 BUILT_IN_RETURN, NULL_PTR);
3238 /* Currently under experimentation. */
3239 builtin_function ("__builtin_memcpy", memcpy_ftype,
3240 BUILT_IN_MEMCPY, "memcpy");
3241 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3242 BUILT_IN_MEMCMP, "memcmp");
3243 builtin_function ("__builtin_memset", memset_ftype,
3244 BUILT_IN_MEMSET, NULL_PTR);
3245 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3246 BUILT_IN_STRCMP, "strcmp");
3247 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3248 BUILT_IN_STRCPY, "strcpy");
3249 builtin_function ("__builtin_strlen", strlen_ftype,
3250 BUILT_IN_STRLEN, "strlen");
3251 builtin_function ("__builtin_sqrtf", float_ftype_float,
3252 BUILT_IN_FSQRT, "sqrtf");
3253 builtin_function ("__builtin_fsqrt", double_ftype_double,
3254 BUILT_IN_FSQRT, "sqrt");
3255 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3256 BUILT_IN_FSQRT, "sqrtl");
3257 builtin_function ("__builtin_sinf", float_ftype_float,
3258 BUILT_IN_SIN, "sinf");
3259 builtin_function ("__builtin_sin", double_ftype_double,
3260 BUILT_IN_SIN, "sin");
3261 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3262 BUILT_IN_SIN, "sinl");
3263 builtin_function ("__builtin_cosf", float_ftype_float,
3264 BUILT_IN_COS, "cosf");
3265 builtin_function ("__builtin_cos", double_ftype_double,
3266 BUILT_IN_COS, "cos");
3267 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3268 BUILT_IN_COS, "cosl");
3269 builtin_function ("__builtin_setjmp",
3270 build_function_type (integer_type_node,
3271 tree_cons (NULL_TREE,
3272 ptr_type_node, endlink)),
3273 BUILT_IN_SETJMP, NULL_PTR);
3274 builtin_function ("__builtin_longjmp",
3277 tree_cons (NULL, ptr_type_node,
3278 tree_cons (NULL_TREE,
3281 BUILT_IN_LONGJMP, NULL_PTR);
3283 /* In an ANSI C program, it is okay to supply built-in meanings
3284 for these functions, since applications cannot validly use them
3285 with any other meaning.
3286 However, honor the -fno-builtin option. */
3287 if (!flag_no_builtin)
3289 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3290 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3291 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3292 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3294 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3295 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3296 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3298 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3299 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3301 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3303 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3304 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3305 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3306 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3308 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3309 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3310 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3311 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3312 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3313 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3315 /* Declare these functions volatile
3316 to avoid spurious "control drops through" warnings. */
3317 /* Don't specify the argument types, to avoid errors
3318 from certain code which isn't valid in ANSI but which exists. */
3319 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3321 TREE_THIS_VOLATILE (temp) = 1;
3322 TREE_SIDE_EFFECTS (temp) = 1;
3323 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3324 TREE_THIS_VOLATILE (temp) = 1;
3325 TREE_SIDE_EFFECTS (temp) = 1;
3329 /* Support for these has not been written in either expand_builtin
3330 or build_function_call. */
3331 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3332 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3333 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3335 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3337 builtin_function ("__builtin_fmod", double_ftype_double_double,
3338 BUILT_IN_FMOD, NULL_PTR);
3339 builtin_function ("__builtin_frem", double_ftype_double_double,
3340 BUILT_IN_FREM, NULL_PTR);
3341 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3342 BUILT_IN_MEMSET, NULL_PTR);
3343 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3345 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3349 pedantic_lvalues = pedantic;
3351 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3352 declare_function_name ();
3354 start_identifier_warnings ();
3356 /* Prepare to check format strings against argument lists. */
3357 init_function_format_info ();
3361 incomplete_decl_finalize_hook = finish_incomplete_decl;
3364 /* Return a definition for a builtin function named NAME and whose data type
3365 is TYPE. TYPE should be a function type with argument types.
3366 FUNCTION_CODE tells later passes how to compile calls to this function.
3367 See tree.h for its possible values.
3369 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3370 the name to be called if we can't opencode the function. */
3373 builtin_function (name, type, function_code, library_name)
3376 enum built_in_function function_code;
3379 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3380 DECL_EXTERNAL (decl) = 1;
3381 TREE_PUBLIC (decl) = 1;
3382 /* If -traditional, permit redefining a builtin function any way you like.
3383 (Though really, if the program redefines these functions,
3384 it probably won't work right unless compiled with -fno-builtin.) */
3385 if (flag_traditional && name[0] != '_')
3386 DECL_BUILT_IN_NONANSI (decl) = 1;
3388 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3389 make_decl_rtl (decl, NULL_PTR, 1);
3391 if (function_code != NOT_BUILT_IN)
3393 DECL_BUILT_IN (decl) = 1;
3394 DECL_FUNCTION_CODE (decl) = function_code;
3396 /* Warn if a function in the namespace for users
3397 is used without an occasion to consider it declared. */
3398 if (name[0] != '_' || name[1] != '_')
3399 C_DECL_ANTICIPATED (decl) = 1;
3404 /* Called when a declaration is seen that contains no names to declare.
3405 If its type is a reference to a structure, union or enum inherited
3406 from a containing scope, shadow that tag name for the current scope
3407 with a forward reference.
3408 If its type defines a new named structure or union
3409 or defines an enum, it is valid but we need not do anything here.
3410 Otherwise, it is an error. */
3413 shadow_tag (declspecs)
3416 shadow_tag_warned (declspecs, 0);
3420 shadow_tag_warned (declspecs, warned)
3423 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3429 pending_invalid_xref = 0;
3431 for (link = declspecs; link; link = TREE_CHAIN (link))
3433 register tree value = TREE_VALUE (link);
3434 register enum tree_code code = TREE_CODE (value);
3436 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3437 /* Used to test also that TYPE_SIZE (value) != 0.
3438 That caused warning for `struct foo;' at top level in the file. */
3440 register tree name = lookup_tag_reverse (value);
3447 if (warned != 1 && code != ENUMERAL_TYPE)
3448 /* Empty unnamed enum OK */
3450 pedwarn ("unnamed struct/union that defines no instances");
3456 t = lookup_tag (code, name, current_binding_level, 1);
3460 t = make_node (code);
3467 if (!warned && ! in_system_header)
3469 warning ("useless keyword or type name in empty declaration");
3476 error ("two types specified in one empty declaration");
3481 pedwarn ("empty declaration");
3485 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3488 groktypename (typename)
3491 if (TREE_CODE (typename) != TREE_LIST)
3493 return grokdeclarator (TREE_VALUE (typename),
3494 TREE_PURPOSE (typename),
3498 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3501 groktypename_in_parm_context (typename)
3504 if (TREE_CODE (typename) != TREE_LIST)
3506 return grokdeclarator (TREE_VALUE (typename),
3507 TREE_PURPOSE (typename),
3511 /* Decode a declarator in an ordinary declaration or data definition.
3512 This is called as soon as the type information and variable name
3513 have been parsed, before parsing the initializer if any.
3514 Here we create the ..._DECL node, fill in its type,
3515 and put it on the list of decls for the current context.
3516 The ..._DECL node is returned as the value.
3518 Exception: for arrays where the length is not specified,
3519 the type is left null, to be filled in by `finish_decl'.
3521 Function definitions do not come here; they go to start_function
3522 instead. However, external and forward declarations of functions
3523 do go through here. Structure field declarations are done by
3524 grokfield and not through here. */
3526 /* Set this to zero to debug not using the temporary obstack
3527 to parse initializers. */
3528 int debug_temp_inits = 1;
3531 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3532 tree declarator, declspecs;
3534 tree attributes, prefix_attributes;
3536 register tree decl = grokdeclarator (declarator, declspecs,
3537 NORMAL, initialized);
3539 int init_written = initialized;
3541 /* The corresponding pop_obstacks is in finish_decl. */
3542 push_obstacks_nochange ();
3545 /* Is it valid for this decl to have an initializer at all?
3546 If not, set INITIALIZED to zero, which will indirectly
3547 tell `finish_decl' to ignore the initializer once it is parsed. */
3548 switch (TREE_CODE (decl))
3551 /* typedef foo = bar means give foo the same type as bar.
3552 We haven't parsed bar yet, so `finish_decl' will fix that up.
3553 Any other case of an initialization in a TYPE_DECL is an error. */
3554 if (pedantic || list_length (declspecs) > 1)
3556 error ("typedef `%s' is initialized",
3557 IDENTIFIER_POINTER (DECL_NAME (decl)));
3563 error ("function `%s' is initialized like a variable",
3564 IDENTIFIER_POINTER (DECL_NAME (decl)));
3569 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3570 error ("parameter `%s' is initialized",
3571 IDENTIFIER_POINTER (DECL_NAME (decl)));
3576 /* Don't allow initializations for incomplete types
3577 except for arrays which might be completed by the initialization. */
3578 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3580 /* A complete type is ok if size is fixed. */
3582 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3583 || C_DECL_VARIABLE_SIZE (decl))
3585 error ("variable-sized object may not be initialized");
3589 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3591 error ("variable `%s' has initializer but incomplete type",
3592 IDENTIFIER_POINTER (DECL_NAME (decl)));
3595 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3597 error ("elements of array `%s' have incomplete type",
3598 IDENTIFIER_POINTER (DECL_NAME (decl)));
3605 #if 0 /* Seems redundant with grokdeclarator. */
3606 if (current_binding_level != global_binding_level
3607 && DECL_EXTERNAL (decl)
3608 && TREE_CODE (decl) != FUNCTION_DECL)
3609 warning ("declaration of `%s' has `extern' and is initialized",
3610 IDENTIFIER_POINTER (DECL_NAME (decl)));
3612 DECL_EXTERNAL (decl) = 0;
3613 if (current_binding_level == global_binding_level)
3614 TREE_STATIC (decl) = 1;
3616 /* Tell `pushdecl' this is an initialized decl
3617 even though we don't yet have the initializer expression.
3618 Also tell `finish_decl' it may store the real initializer. */
3619 DECL_INITIAL (decl) = error_mark_node;
3622 /* If this is a function declaration, write a record describing it to the
3623 prototypes file (if requested). */
3625 if (TREE_CODE (decl) == FUNCTION_DECL)
3626 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3628 /* ANSI specifies that a tentative definition which is not merged with
3629 a non-tentative definition behaves exactly like a definition with an
3630 initializer equal to zero. (Section 3.7.2)
3631 -fno-common gives strict ANSI behavior. Usually you don't want it.
3632 This matters only for variables with external linkage. */
3633 if (! flag_no_common || ! TREE_PUBLIC (decl))
3634 DECL_COMMON (decl) = 1;
3636 /* Set attributes here so if duplicate decl, will have proper attributes. */
3637 decl_attributes (decl, attributes, prefix_attributes);
3639 /* Add this decl to the current binding level.
3640 TEM may equal DECL or it may be a previous decl of the same name. */
3641 tem = pushdecl (decl);
3643 /* For a local variable, define the RTL now. */
3644 if (current_binding_level != global_binding_level
3645 /* But not if this is a duplicate decl
3646 and we preserved the rtl from the previous one
3647 (which may or may not happen). */
3648 && DECL_RTL (tem) == 0)
3650 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3652 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3653 && DECL_INITIAL (tem) != 0)
3659 /* When parsing and digesting the initializer,
3660 use temporary storage. Do this even if we will ignore the value. */
3661 if (current_binding_level == global_binding_level && debug_temp_inits)
3662 temporary_allocation ();
3668 /* Finish processing of a declaration;
3669 install its initial value.
3670 If the length of an array type is not known before,
3671 it must be determined now, from the initial value, or it is an error. */
3674 finish_decl (decl, init, asmspec_tree)
3678 register tree type = TREE_TYPE (decl);
3679 int was_incomplete = (DECL_SIZE (decl) == 0);
3680 int temporary = allocation_temporary_p ();
3683 /* If a name was specified, get the string. */
3685 asmspec = TREE_STRING_POINTER (asmspec_tree);
3687 /* If `start_decl' didn't like having an initialization, ignore it now. */
3689 if (init != 0 && DECL_INITIAL (decl) == 0)
3691 /* Don't crash if parm is initialized. */
3692 if (TREE_CODE (decl) == PARM_DECL)
3695 if (ITERATOR_P (decl))
3698 error_with_decl (decl, "iterator has no initial value");
3700 init = save_expr (init);
3705 if (TREE_CODE (decl) != TYPE_DECL)
3706 store_init_value (decl, init);
3709 /* typedef foo = bar; store the type of bar as the type of foo. */
3710 TREE_TYPE (decl) = TREE_TYPE (init);
3711 DECL_INITIAL (decl) = init = 0;
3715 /* Pop back to the obstack that is current for this binding level.
3716 This is because MAXINDEX, rtl, etc. to be made below
3717 must go in the permanent obstack. But don't discard the
3718 temporary data yet. */
3720 #if 0 /* pop_obstacks was near the end; this is what was here. */
3721 if (current_binding_level == global_binding_level && temporary)
3722 end_temporary_allocation ();
3725 /* Deduce size of array from initialization, if not already known */
3727 if (TREE_CODE (type) == ARRAY_TYPE
3728 && TYPE_DOMAIN (type) == 0
3729 && TREE_CODE (decl) != TYPE_DECL)
3732 = (TREE_STATIC (decl)
3733 /* Even if pedantic, an external linkage array
3734 may have incomplete type at first. */
3735 ? pedantic && !TREE_PUBLIC (decl)
3736 : !DECL_EXTERNAL (decl));
3738 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3740 /* Get the completed type made by complete_array_type. */
3741 type = TREE_TYPE (decl);
3744 error_with_decl (decl, "initializer fails to determine size of `%s'");
3749 error_with_decl (decl, "array size missing in `%s'");
3750 /* If a `static' var's size isn't known,
3751 make it extern as well as static, so it does not get
3753 If it is not `static', then do not mark extern;
3754 finish_incomplete_decl will give it a default size
3755 and it will get allocated. */
3756 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3757 DECL_EXTERNAL (decl) = 1;
3760 /* TYPE_MAX_VALUE is always one less than the number of elements
3761 in the array, because we start counting at zero. Therefore,
3762 warn only if the value is less than zero. */
3763 if (pedantic && TYPE_DOMAIN (type) != 0
3764 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3765 error_with_decl (decl, "zero or negative size array `%s'");
3767 layout_decl (decl, 0);
3770 if (TREE_CODE (decl) == VAR_DECL)
3772 if (DECL_SIZE (decl) == 0
3773 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3774 layout_decl (decl, 0);
3776 if (DECL_SIZE (decl) == 0
3777 && (TREE_STATIC (decl)
3779 /* A static variable with an incomplete type
3780 is an error if it is initialized.
3781 Also if it is not file scope.
3782 Otherwise, let it through, but if it is not `extern'
3783 then it may cause an error message later. */
3784 /* A duplicate_decls call could have changed an extern
3785 declaration into a file scope one. This can be detected
3786 by TREE_ASM_WRITTEN being set. */
3787 (DECL_INITIAL (decl) != 0
3788 || DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl))
3790 /* An automatic variable with an incomplete type
3792 !DECL_EXTERNAL (decl)))
3794 error_with_decl (decl, "storage size of `%s' isn't known");
3795 TREE_TYPE (decl) = error_mark_node;
3798 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3799 && DECL_SIZE (decl) != 0)
3801 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3802 constant_expression_warning (DECL_SIZE (decl));
3804 error_with_decl (decl, "storage size of `%s' isn't constant");
3808 /* If this is a function and an assembler name is specified, it isn't
3809 builtin any more. Also reset DECL_RTL so we can give it its new
3811 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3813 DECL_BUILT_IN (decl) = 0;
3814 DECL_RTL (decl) = 0;
3817 /* Output the assembler code and/or RTL code for variables and functions,
3818 unless the type is an undefined structure or union.
3819 If not, it will get done when the type is completed. */
3821 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3823 if ((flag_traditional || TREE_PERMANENT (decl))
3824 && allocation_temporary_p ())
3826 push_obstacks_nochange ();
3827 end_temporary_allocation ();
3828 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3829 maybe_objc_check_decl (decl);
3830 rest_of_decl_compilation (decl, asmspec,
3831 (DECL_CONTEXT (decl) == 0
3832 || TREE_ASM_WRITTEN (decl)),
3838 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3839 maybe_objc_check_decl (decl);
3840 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3843 if (DECL_CONTEXT (decl) != 0)
3845 /* Recompute the RTL of a local array now
3846 if it used to be an incomplete type. */
3848 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3850 /* If we used it already as memory, it must stay in memory. */
3851 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3852 /* If it's still incomplete now, no init will save it. */
3853 if (DECL_SIZE (decl) == 0)
3854 DECL_INITIAL (decl) = 0;
3857 /* Compute and store the initial value. */
3858 if (TREE_CODE (decl) != FUNCTION_DECL)
3859 expand_decl_init (decl);
3863 if (TREE_CODE (decl) == TYPE_DECL)
3865 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3866 maybe_objc_check_decl (decl);
3867 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3871 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3872 /* This test used to include TREE_PERMANENT, however, we have the same
3873 problem with initializers at the function level. Such initializers get
3874 saved until the end of the function on the momentary_obstack. */
3875 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3877 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3878 space with DECL_ARG_TYPE. */
3879 && TREE_CODE (decl) != PARM_DECL)
3881 /* We need to remember that this array HAD an initialization,
3882 but discard the actual temporary nodes,
3883 since we can't have a permanent node keep pointing to them. */
3884 /* We make an exception for inline functions, since it's
3885 normal for a local extern redeclaration of an inline function
3886 to have a copy of the top-level decl's DECL_INLINE. */
3887 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3889 /* If this is a const variable, then preserve the
3890 initializer instead of discarding it so that we can optimize
3891 references to it. */
3892 /* This test used to include TREE_STATIC, but this won't be set
3893 for function level initializers. */
3894 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3896 preserve_initializer ();
3897 /* Hack? Set the permanent bit for something that is permanent,
3898 but not on the permanent obstack, so as to convince
3899 output_constant_def to make its rtl on the permanent
3901 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3903 /* The initializer and DECL must have the same (or equivalent
3904 types), but if the initializer is a STRING_CST, its type
3905 might not be on the right obstack, so copy the type
3907 TREE_TYPE (DECL_INITIAL (decl)) = type;
3910 DECL_INITIAL (decl) = error_mark_node;
3914 /* If requested, warn about definitions of large data objects. */
3916 if (warn_larger_than
3917 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3918 && !DECL_EXTERNAL (decl))
3920 register tree decl_size = DECL_SIZE (decl);
3922 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3924 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3926 if (units > larger_than_size)
3927 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3932 /* Resume permanent allocation, if not within a function. */
3933 /* The corresponding push_obstacks_nochange is in start_decl,
3934 and in push_parm_decl and in grokfield. */
3938 /* If we have gone back from temporary to permanent allocation,
3939 actually free the temporary space that we no longer need. */
3940 if (temporary && !allocation_temporary_p ())
3941 permanent_allocation (0);
3943 /* At the end of a declaration, throw away any variable type sizes
3944 of types defined inside that declaration. There is no use
3945 computing them in the following function definition. */
3946 if (current_binding_level == global_binding_level)
3947 get_pending_sizes ();
3950 /* If DECL has a cleanup, build and return that cleanup here.
3951 This is a callback called by expand_expr. */
3954 maybe_build_cleanup (decl)
3957 /* There are no cleanups in C. */
3961 /* Given a parsed parameter declaration,
3962 decode it into a PARM_DECL and push that on the current binding level.
3963 Also, for the sake of forward parm decls,
3964 record the given order of parms in `parm_order'. */
3967 push_parm_decl (parm)
3971 int old_immediate_size_expand = immediate_size_expand;
3972 /* Don't try computing parm sizes now -- wait till fn is called. */
3973 immediate_size_expand = 0;
3975 /* The corresponding pop_obstacks is in finish_decl. */
3976 push_obstacks_nochange ();
3978 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3979 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3980 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3981 TREE_PURPOSE (TREE_VALUE (parm)));
3984 if (DECL_NAME (decl))
3987 olddecl = lookup_name (DECL_NAME (decl));
3988 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3989 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3993 decl = pushdecl (decl);
3995 immediate_size_expand = old_immediate_size_expand;
3997 current_binding_level->parm_order
3998 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4000 /* Add this decl to the current binding level. */
4001 finish_decl (decl, NULL_TREE, NULL_TREE);
4004 /* Clear the given order of parms in `parm_order'.
4005 Used at start of parm list,
4006 and also at semicolon terminating forward decls. */
4011 current_binding_level->parm_order = NULL_TREE;
4014 /* Make TYPE a complete type based on INITIAL_VALUE.
4015 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4016 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4019 complete_array_type (type, initial_value, do_default)
4024 register tree maxindex = NULL_TREE;
4029 /* Note MAXINDEX is really the maximum index,
4030 one less than the size. */
4031 if (TREE_CODE (initial_value) == STRING_CST)
4034 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4035 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4038 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4040 tree elts = CONSTRUCTOR_ELTS (initial_value);
4041 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4042 for (; elts; elts = TREE_CHAIN (elts))
4044 if (TREE_PURPOSE (elts))
4045 maxindex = TREE_PURPOSE (elts);
4047 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4049 maxindex = copy_node (maxindex);
4053 /* Make an error message unless that happened already. */
4054 if (initial_value != error_mark_node)
4057 /* Prevent further error messages. */
4058 maxindex = build_int_2 (0, 0);
4065 maxindex = build_int_2 (0, 0);
4071 TYPE_DOMAIN (type) = build_index_type (maxindex);
4072 if (!TREE_TYPE (maxindex))
4073 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4074 #if 0 /* I took out this change
4075 together with the change in build_array_type. --rms */
4076 change_main_variant (type,
4077 build_array_type (TREE_TYPE (type),
4078 TYPE_DOMAIN (type)));
4082 /* Lay out the type now that we can get the real answer. */
4089 /* Given declspecs and a declarator,
4090 determine the name and type of the object declared
4091 and construct a ..._DECL node for it.
4092 (In one case we can return a ..._TYPE node instead.
4093 For invalid input we sometimes return 0.)
4095 DECLSPECS is a chain of tree_list nodes whose value fields
4096 are the storage classes and type specifiers.
4098 DECL_CONTEXT says which syntactic context this declaration is in:
4099 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4100 FUNCDEF for a function definition. Like NORMAL but a few different
4101 error messages in each case. Return value may be zero meaning
4102 this definition is too screwy to try to parse.
4103 PARM for a parameter declaration (either within a function prototype
4104 or before a function body). Make a PARM_DECL, or return void_type_node.
4105 TYPENAME if for a typename (in a cast or sizeof).
4106 Don't make a DECL node; just return the ..._TYPE node.
4107 FIELD for a struct or union field; make a FIELD_DECL.
4108 BITFIELD for a field with specified width.
4109 INITIALIZED is 1 if the decl has an initializer.
4111 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4112 It may also be so in the PARM case, for a prototype where the
4113 argument type is specified but not the name.
4115 This function is where the complicated C meanings of `static'
4116 and `extern' are interpreted. */
4119 grokdeclarator (declarator, declspecs, decl_context, initialized)
4122 enum decl_context decl_context;
4127 tree type = NULL_TREE;
4132 int explicit_int = 0;
4133 int explicit_char = 0;
4134 int defaulted_int = 0;
4135 tree typedef_decl = 0;
4137 tree typedef_type = 0;
4138 int funcdef_flag = 0;
4139 enum tree_code innermost_code = ERROR_MARK;
4141 int size_varies = 0;
4142 tree decl_machine_attr = NULL_TREE;
4144 if (decl_context == BITFIELD)
4145 bitfield = 1, decl_context = FIELD;
4147 if (decl_context == FUNCDEF)
4148 funcdef_flag = 1, decl_context = NORMAL;
4150 push_obstacks_nochange ();
4152 if (flag_traditional && allocation_temporary_p ())
4153 end_temporary_allocation ();
4155 /* Look inside a declarator for the name being declared
4156 and get it as a string, for an error message. */
4158 register tree decl = declarator;
4162 switch (TREE_CODE (decl))
4167 innermost_code = TREE_CODE (decl);
4168 decl = TREE_OPERAND (decl, 0);
4171 case IDENTIFIER_NODE:
4172 name = IDENTIFIER_POINTER (decl);
4183 /* A function definition's declarator must have the form of
4184 a function declarator. */
4186 if (funcdef_flag && innermost_code != CALL_EXPR)
4189 /* Anything declared one level down from the top level
4190 must be one of the parameters of a function
4191 (because the body is at least two levels down). */
4193 /* If this looks like a function definition, make it one,
4194 even if it occurs where parms are expected.
4195 Then store_parm_decls will reject it and not use it as a parm. */
4196 if (decl_context == NORMAL && !funcdef_flag
4197 && current_binding_level->parm_flag)
4198 decl_context = PARM;
4200 /* Look through the decl specs and record which ones appear.
4201 Some typespecs are defined as built-in typenames.
4202 Others, the ones that are modifiers of other types,
4203 are represented by bits in SPECBITS: set the bits for
4204 the modifiers that appear. Storage class keywords are also in SPECBITS.
4206 If there is a typedef name or a type, store the type in TYPE.
4207 This includes builtin typedefs such as `int'.
4209 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4210 and did not come from a user typedef.
4212 Set LONGLONG if `long' is mentioned twice. */
4214 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4217 register tree id = TREE_VALUE (spec);
4219 if (id == ridpointers[(int) RID_INT])
4221 if (id == ridpointers[(int) RID_CHAR])
4224 if (TREE_CODE (id) == IDENTIFIER_NODE)
4225 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4227 if (ridpointers[i] == id)
4229 if (i == (int) RID_LONG && specbits & (1<<i))
4232 error ("`long long long' is too long for GCC");
4235 if (pedantic && ! in_system_header)
4236 pedwarn ("ANSI C does not support `long long'");
4240 else if (specbits & (1 << i))
4241 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4247 error ("two or more data types in declaration of `%s'", name);
4248 /* Actual typedefs come to us as TYPE_DECL nodes. */
4249 else if (TREE_CODE (id) == TYPE_DECL)
4251 type = TREE_TYPE (id);
4252 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4255 /* Built-in types come as identifiers. */
4256 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4258 register tree t = lookup_name (id);
4259 if (TREE_TYPE (t) == error_mark_node)
4261 else if (!t || TREE_CODE (t) != TYPE_DECL)
4262 error ("`%s' fails to be a typedef or built in type",
4263 IDENTIFIER_POINTER (id));
4266 type = TREE_TYPE (t);
4270 else if (TREE_CODE (id) != ERROR_MARK)
4276 typedef_type = type;
4278 size_varies = C_TYPE_VARIABLE_SIZE (type);
4280 /* No type at all: default to `int', and set DEFAULTED_INT
4281 because it was not a user-defined typedef. */
4285 if (! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4286 | (1 << (int) RID_SIGNED)
4287 | (1 << (int) RID_UNSIGNED))))
4289 /* C9x will probably require a diagnostic here.
4290 For now, issue a warning if -Wreturn-type and this is a function,
4291 or if -Wimplicit; prefer the former warning since it is more
4293 if ((warn_implicit || warn_return_type) && funcdef_flag)
4294 warn_about_return_type = 1;
4295 else if (warn_implicit)
4296 warning ("type defaults to `int' in declaration of `%s'", name);
4300 type = integer_type_node;
4303 /* Now process the modifiers that were specified
4304 and check for invalid combinations. */
4306 /* Long double is a special combination. */
4308 if ((specbits & 1 << (int) RID_LONG)
4309 && TYPE_MAIN_VARIANT (type) == double_type_node)
4311 specbits &= ~ (1 << (int) RID_LONG);
4312 type = long_double_type_node;
4315 /* Check all other uses of type modifiers. */
4317 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4318 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4322 if (TREE_CODE (type) != INTEGER_TYPE)
4323 error ("long, short, signed or unsigned invalid for `%s'", name);
4324 else if ((specbits & 1 << (int) RID_LONG)
4325 && (specbits & 1 << (int) RID_SHORT))
4326 error ("long and short specified together for `%s'", name);
4327 else if (((specbits & 1 << (int) RID_LONG)
4328 || (specbits & 1 << (int) RID_SHORT))
4330 error ("long or short specified with char for `%s'", name);
4331 else if (((specbits & 1 << (int) RID_LONG)
4332 || (specbits & 1 << (int) RID_SHORT))
4333 && TREE_CODE (type) == REAL_TYPE)
4334 error ("long or short specified with floating type for `%s'", name);
4335 else if ((specbits & 1 << (int) RID_SIGNED)
4336 && (specbits & 1 << (int) RID_UNSIGNED))
4337 error ("signed and unsigned given together for `%s'", name);
4341 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4343 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4345 if (flag_pedantic_errors)
4350 /* Discard the type modifiers if they are invalid. */
4353 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4354 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4359 if ((specbits & (1 << (int) RID_COMPLEX))
4360 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4362 error ("complex invalid for `%s'", name);
4363 specbits &= ~ (1 << (int) RID_COMPLEX);
4366 /* Decide whether an integer type is signed or not.
4367 Optionally treat bitfields as signed by default. */
4368 if (specbits & 1 << (int) RID_UNSIGNED
4369 /* Traditionally, all bitfields are unsigned. */
4370 || (bitfield && flag_traditional
4371 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4372 || (bitfield && ! flag_signed_bitfields
4373 && (explicit_int || defaulted_int || explicit_char
4374 /* A typedef for plain `int' without `signed'
4375 can be controlled just like plain `int'. */
4376 || ! (typedef_decl != 0
4377 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4378 && TREE_CODE (type) != ENUMERAL_TYPE
4379 && !(specbits & 1 << (int) RID_SIGNED)))
4382 type = long_long_unsigned_type_node;
4383 else if (specbits & 1 << (int) RID_LONG)
4384 type = long_unsigned_type_node;
4385 else if (specbits & 1 << (int) RID_SHORT)
4386 type = short_unsigned_type_node;
4387 else if (type == char_type_node)
4388 type = unsigned_char_type_node;
4389 else if (typedef_decl)
4390 type = unsigned_type (type);
4392 type = unsigned_type_node;
4394 else if ((specbits & 1 << (int) RID_SIGNED)
4395 && type == char_type_node)
4396 type = signed_char_type_node;
4398 type = long_long_integer_type_node;
4399 else if (specbits & 1 << (int) RID_LONG)
4400 type = long_integer_type_node;
4401 else if (specbits & 1 << (int) RID_SHORT)
4402 type = short_integer_type_node;
4404 if (specbits & 1 << (int) RID_COMPLEX)
4406 /* If we just have "complex", it is equivalent to
4407 "complex double", but if any modifiers at all are specified it is
4408 the complex form of TYPE. E.g, "complex short" is
4409 "complex short int". */
4411 if (defaulted_int && ! longlong
4412 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4413 | (1 << (int) RID_SIGNED)
4414 | (1 << (int) RID_UNSIGNED))))
4415 type = complex_double_type_node;
4416 else if (type == integer_type_node)
4417 type = complex_integer_type_node;
4418 else if (type == float_type_node)
4419 type = complex_float_type_node;
4420 else if (type == double_type_node)
4421 type = complex_double_type_node;
4422 else if (type == long_double_type_node)
4423 type = complex_long_double_type_node;
4425 type = build_complex_type (type);
4428 /* Set CONSTP if this declaration is `const', whether by
4429 explicit specification or via a typedef.
4430 Likewise for VOLATILEP. */
4432 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4433 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4434 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4436 pedwarn ("duplicate `const'");
4438 pedwarn ("duplicate `volatile'");
4439 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4440 type = TYPE_MAIN_VARIANT (type);
4442 /* Warn if two storage classes are given. Default to `auto'. */
4447 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4448 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4449 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4450 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4451 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4452 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4454 /* Warn about storage classes that are invalid for certain
4455 kinds of declarations (parameters, typenames, etc.). */
4458 error ("multiple storage classes in declaration of `%s'", name);
4459 else if (funcdef_flag
4461 & ((1 << (int) RID_REGISTER)
4462 | (1 << (int) RID_AUTO)
4463 | (1 << (int) RID_TYPEDEF))))
4465 if (specbits & 1 << (int) RID_AUTO
4466 && (pedantic || current_binding_level == global_binding_level))
4467 pedwarn ("function definition declared `auto'");
4468 if (specbits & 1 << (int) RID_REGISTER)
4469 error ("function definition declared `register'");
4470 if (specbits & 1 << (int) RID_TYPEDEF)
4471 error ("function definition declared `typedef'");
4472 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4473 | (1 << (int) RID_AUTO));
4475 else if (decl_context != NORMAL && nclasses > 0)
4477 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4481 error ((decl_context == FIELD
4482 ? "storage class specified for structure field `%s'"
4483 : (decl_context == PARM
4484 ? "storage class specified for parameter `%s'"
4485 : "storage class specified for typename")),
4487 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4488 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4489 | (1 << (int) RID_EXTERN));
4492 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4494 /* `extern' with initialization is invalid if not at top level. */
4495 if (current_binding_level == global_binding_level)
4496 warning ("`%s' initialized and declared `extern'", name);
4498 error ("`%s' has both `extern' and initializer", name);
4500 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4501 && current_binding_level != global_binding_level)
4502 error ("nested function `%s' declared `extern'", name);
4503 else if (current_binding_level == global_binding_level
4504 && specbits & (1 << (int) RID_AUTO))
4505 error ("top-level declaration of `%s' specifies `auto'", name);
4506 else if ((specbits & 1 << (int) RID_ITERATOR)
4507 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4509 error ("iterator `%s' has derived type", name);
4510 type = error_mark_node;
4512 else if ((specbits & 1 << (int) RID_ITERATOR)
4513 && TREE_CODE (type) != INTEGER_TYPE)
4515 error ("iterator `%s' has noninteger type", name);
4516 type = error_mark_node;
4520 /* Now figure out the structure of the declarator proper.
4521 Descend through it, creating more complex types, until we reach
4522 the declared identifier (or NULL_TREE, in an absolute declarator). */
4524 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4526 if (type == error_mark_node)
4528 declarator = TREE_OPERAND (declarator, 0);
4532 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4533 an INDIRECT_REF (for *...),
4534 a CALL_EXPR (for ...(...)),
4535 an identifier (for the name being declared)
4536 or a null pointer (for the place in an absolute declarator
4537 where the name was omitted).
4538 For the last two cases, we have just exited the loop.
4540 At this point, TYPE is the type of elements of an array,
4541 or for a function to return, or for a pointer to point to.
4542 After this sequence of ifs, TYPE is the type of the
4543 array or function or pointer, and DECLARATOR has had its
4544 outermost layer removed. */
4546 if (TREE_CODE (declarator) == ARRAY_REF)
4548 register tree itype = NULL_TREE;
4549 register tree size = TREE_OPERAND (declarator, 1);
4550 /* An uninitialized decl with `extern' is a reference. */
4551 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4552 /* The index is a signed object `sizetype' bits wide. */
4553 tree index_type = signed_type (sizetype);
4555 declarator = TREE_OPERAND (declarator, 0);
4557 /* Check for some types that there cannot be arrays of. */
4559 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4561 error ("declaration of `%s' as array of voids", name);
4562 type = error_mark_node;
4565 if (TREE_CODE (type) == FUNCTION_TYPE)
4567 error ("declaration of `%s' as array of functions", name);
4568 type = error_mark_node;
4571 if (size == error_mark_node)
4572 type = error_mark_node;
4574 if (type == error_mark_node)
4577 /* If this is a block level extern, it must live past the end
4578 of the function so that we can check it against other extern
4579 declarations (IDENTIFIER_LIMBO_VALUE). */
4580 if (extern_ref && allocation_temporary_p ())
4581 end_temporary_allocation ();
4583 /* If size was specified, set ITYPE to a range-type for that size.
4584 Otherwise, ITYPE remains null. finish_decl may figure it out
4585 from an initial value. */
4589 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4590 STRIP_TYPE_NOPS (size);
4592 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4593 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4595 error ("size of array `%s' has non-integer type", name);
4596 size = integer_one_node;
4599 if (pedantic && integer_zerop (size))
4600 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4602 if (TREE_CODE (size) == INTEGER_CST)
4604 constant_expression_warning (size);
4605 if (tree_int_cst_sgn (size) < 0)
4607 error ("size of array `%s' is negative", name);
4608 size = integer_one_node;
4613 /* Make sure the array size remains visibly nonconstant
4614 even if it is (eg) a const variable with known value. */
4619 if (TREE_CONSTANT (size))
4620 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4622 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4626 /* Convert size to index_type, so that if it is a variable
4627 the computations will be done in the proper mode. */
4628 itype = fold (build (MINUS_EXPR, index_type,
4629 convert (index_type, size),
4630 convert (index_type, size_one_node)));
4633 itype = variable_size (itype);
4634 itype = build_index_type (itype);
4637 #if 0 /* This had bad results for pointers to arrays, as in
4638 union incomplete (*foo)[4]; */
4639 /* Complain about arrays of incomplete types, except in typedefs. */
4641 if (TYPE_SIZE (type) == 0
4642 /* Avoid multiple warnings for nested array types. */
4643 && TREE_CODE (type) != ARRAY_TYPE
4644 && !(specbits & (1 << (int) RID_TYPEDEF))
4645 && !C_TYPE_BEING_DEFINED (type))
4646 warning ("array type has incomplete element type");
4649 #if 0 /* We shouldn't have a function type here at all!
4650 Functions aren't allowed as array elements. */
4651 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4652 && (constp || volatilep))
4653 pedwarn ("ANSI C forbids const or volatile function types");
4656 /* Build the array type itself, then merge any constancy or
4657 volatility into the target type. We must do it in this order
4658 to ensure that the TYPE_MAIN_VARIANT field of the array type
4659 is set correctly. */
4661 type = build_array_type (type, itype);
4662 if (constp || volatilep)
4663 type = c_build_type_variant (type, constp, volatilep);
4665 #if 0 /* don't clear these; leave them set so that the array type
4666 or the variable is itself const or volatile. */
4672 C_TYPE_VARIABLE_SIZE (type) = 1;
4674 else if (TREE_CODE (declarator) == CALL_EXPR)
4676 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4677 || current_binding_level == global_binding_level);
4680 /* Declaring a function type.
4681 Make sure we have a valid type for the function to return. */
4682 if (type == error_mark_node)
4687 /* Warn about some types functions can't return. */
4689 if (TREE_CODE (type) == FUNCTION_TYPE)
4691 error ("`%s' declared as function returning a function", name);
4692 type = integer_type_node;
4694 if (TREE_CODE (type) == ARRAY_TYPE)
4696 error ("`%s' declared as function returning an array", name);
4697 type = integer_type_node;
4700 #ifndef TRADITIONAL_RETURN_FLOAT
4701 /* Traditionally, declaring return type float means double. */
4703 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4704 type = double_type_node;
4705 #endif /* TRADITIONAL_RETURN_FLOAT */
4707 /* If this is a block level extern, it must live past the end
4708 of the function so that we can check it against other extern
4709 declarations (IDENTIFIER_LIMBO_VALUE). */
4710 if (extern_ref && allocation_temporary_p ())
4711 end_temporary_allocation ();
4713 /* Construct the function type and go to the next
4714 inner layer of declarator. */
4716 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4718 /* Say it's a definition
4719 only for the CALL_EXPR
4720 closest to the identifier. */
4721 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4722 #if 0 /* This seems to be false. We turn off temporary allocation
4723 above in this function if -traditional.
4724 And this code caused inconsistent results with prototypes:
4725 callers would ignore them, and pass arguments wrong. */
4727 /* Omit the arg types if -traditional, since the arg types
4728 and the list links might not be permanent. */
4729 type = build_function_type (type,
4731 ? NULL_TREE : arg_types);
4733 /* ANSI seems to say that `const int foo ();'
4734 does not make the function foo const. */
4735 if (constp || volatilep)
4736 type = c_build_type_variant (type, constp, volatilep);
4740 type = build_function_type (type, arg_types);
4741 declarator = TREE_OPERAND (declarator, 0);
4743 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4744 the formal parameter list of this FUNCTION_TYPE to point to
4745 the FUNCTION_TYPE node itself. */
4750 for (link = current_function_parm_tags;
4752 link = TREE_CHAIN (link))
4753 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4756 else if (TREE_CODE (declarator) == INDIRECT_REF)
4758 /* Merge any constancy or volatility into the target type
4761 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4762 && (constp || volatilep))
4763 pedwarn ("ANSI C forbids const or volatile function types");
4764 if (constp || volatilep)
4765 type = c_build_type_variant (type, constp, volatilep);
4770 type = build_pointer_type (type);
4772 /* Process a list of type modifier keywords
4773 (such as const or volatile) that were given inside the `*'. */
4775 if (TREE_TYPE (declarator))
4777 register tree typemodlist;
4779 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4780 typemodlist = TREE_CHAIN (typemodlist))
4782 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4784 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4789 error ("invalid type modifier within pointer declarator");
4793 pedwarn ("duplicate `const'");
4795 pedwarn ("duplicate `volatile'");
4798 declarator = TREE_OPERAND (declarator, 0);
4805 /* Now TYPE has the actual type. */
4807 /* If this is declaring a typedef name, return a TYPE_DECL. */
4809 if (specbits & (1 << (int) RID_TYPEDEF))
4812 /* Note that the grammar rejects storage classes
4813 in typenames, fields or parameters */
4814 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4815 && (constp || volatilep))
4816 pedwarn ("ANSI C forbids const or volatile function types");
4817 if (constp || volatilep)
4818 type = c_build_type_variant (type, constp, volatilep);
4819 decl = build_decl (TYPE_DECL, declarator, type);
4820 if ((specbits & (1 << (int) RID_SIGNED))
4821 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4822 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4827 /* Detect the case of an array type of unspecified size
4828 which came, as such, direct from a typedef name.
4829 We must copy the type, so that each identifier gets
4830 a distinct type, so that each identifier's size can be
4831 controlled separately by its own initializer. */
4833 if (type != 0 && typedef_type != 0
4834 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4835 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4837 type = build_array_type (TREE_TYPE (type), 0);
4839 C_TYPE_VARIABLE_SIZE (type) = 1;
4842 /* If this is a type name (such as, in a cast or sizeof),
4843 compute the type and return it now. */
4845 if (decl_context == TYPENAME)
4847 /* Note that the grammar rejects storage classes
4848 in typenames, fields or parameters */
4849 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4850 && (constp || volatilep))
4851 pedwarn ("ANSI C forbids const or volatile function types");
4852 if (constp || volatilep)
4853 type = c_build_type_variant (type, constp, volatilep);
4858 /* Aside from typedefs and type names (handle above),
4859 `void' at top level (not within pointer)
4860 is allowed only in public variables.
4861 We don't complain about parms either, but that is because
4862 a better error message can be made later. */
4864 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4865 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4866 && ((specbits & (1 << (int) RID_EXTERN))
4867 || (current_binding_level == global_binding_level
4869 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4871 error ("variable or field `%s' declared void", name);
4872 type = integer_type_node;
4875 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4876 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4881 if (decl_context == PARM)
4883 tree type_as_written = type;
4886 /* A parameter declared as an array of T is really a pointer to T.
4887 One declared as a function is really a pointer to a function. */
4889 if (TREE_CODE (type) == ARRAY_TYPE)
4891 /* Transfer const-ness of array into that of type pointed to. */
4892 type = TREE_TYPE (type);
4893 if (constp || volatilep)
4894 type = c_build_type_variant (type, constp, volatilep);
4895 type = build_pointer_type (type);
4896 volatilep = constp = 0;
4899 else if (TREE_CODE (type) == FUNCTION_TYPE)
4901 if (pedantic && (constp || volatilep))
4902 pedwarn ("ANSI C forbids const or volatile function types");
4903 if (constp || volatilep)
4904 type = c_build_type_variant (type, constp, volatilep);
4905 type = build_pointer_type (type);
4906 volatilep = constp = 0;
4909 decl = build_decl (PARM_DECL, declarator, type);
4911 C_DECL_VARIABLE_SIZE (decl) = 1;
4913 /* Compute the type actually passed in the parmlist,
4914 for the case where there is no prototype.
4915 (For example, shorts and chars are passed as ints.)
4916 When there is a prototype, this is overridden later. */
4918 DECL_ARG_TYPE (decl) = type;
4919 main_type = (type == error_mark_node
4921 : TYPE_MAIN_VARIANT (type));
4922 if (main_type == float_type_node)
4923 DECL_ARG_TYPE (decl) = double_type_node;
4924 /* Don't use TYPE_PRECISION to decide whether to promote,
4925 because we should convert short if it's the same size as int,
4926 but we should not convert long if it's the same size as int. */
4927 else if (TREE_CODE (main_type) != ERROR_MARK
4928 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4930 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4931 && TREE_UNSIGNED (type))
4932 DECL_ARG_TYPE (decl) = unsigned_type_node;
4934 DECL_ARG_TYPE (decl) = integer_type_node;
4937 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4939 else if (decl_context == FIELD)
4941 /* Structure field. It may not be a function. */
4943 if (TREE_CODE (type) == FUNCTION_TYPE)
4945 error ("field `%s' declared as a function", name);
4946 type = build_pointer_type (type);
4948 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4950 error ("field `%s' has incomplete type", name);
4951 type = error_mark_node;
4953 /* Move type qualifiers down to element of an array. */
4954 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4956 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4958 TYPE_DOMAIN (type));
4959 #if 0 /* Leave the field const or volatile as well. */
4960 constp = volatilep = 0;
4963 decl = build_decl (FIELD_DECL, declarator, type);
4965 C_DECL_VARIABLE_SIZE (decl) = 1;
4967 else if (TREE_CODE (type) == FUNCTION_TYPE)
4969 /* Every function declaration is "external"
4970 except for those which are inside a function body
4971 in which `auto' is used.
4972 That is a case not specified by ANSI C,
4973 and we use it for forward declarations for nested functions. */
4974 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4975 || current_binding_level == global_binding_level);
4977 if (specbits & (1 << (int) RID_AUTO)
4978 && (pedantic || current_binding_level == global_binding_level))
4979 pedwarn ("invalid storage class for function `%s'", name);
4980 if (specbits & (1 << (int) RID_REGISTER))
4981 error ("invalid storage class for function `%s'", name);
4982 /* Function declaration not at top level.
4983 Storage classes other than `extern' are not allowed
4984 and `extern' makes no difference. */
4985 if (current_binding_level != global_binding_level
4986 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4988 pedwarn ("invalid storage class for function `%s'", name);
4990 /* If this is a block level extern, it must live past the end
4991 of the function so that we can check it against other
4992 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4993 if (extern_ref && allocation_temporary_p ())
4994 end_temporary_allocation ();
4996 decl = build_decl (FUNCTION_DECL, declarator, type);
4997 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4999 if (pedantic && (constp || volatilep)
5000 && ! DECL_IN_SYSTEM_HEADER (decl))
5001 pedwarn ("ANSI C forbids const or volatile functions");
5004 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5005 warning ("`noreturn' function returns non-void value");
5008 DECL_EXTERNAL (decl) = 1;
5009 /* Record absence of global scope for `static' or `auto'. */
5011 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5013 /* Record presence of `inline', if it is reasonable. */
5016 tree last = tree_last (TYPE_ARG_TYPES (type));
5018 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5019 warning ("cannot inline function `main'");
5020 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
5022 warning ("inline declaration ignored for function with `...'");
5024 /* Assume that otherwise the function can be inlined. */
5025 DECL_INLINE (decl) = 1;
5027 if (specbits & (1 << (int) RID_EXTERN))
5028 current_extern_inline = 1;
5033 /* It's a variable. */
5034 /* An uninitialized decl with `extern' is a reference. */
5035 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5037 /* Move type qualifiers down to element of an array. */
5038 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5040 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5042 TYPE_DOMAIN (type));
5043 #if 0 /* Leave the variable const or volatile as well. */
5044 constp = volatilep = 0;
5048 /* If this is a block level extern, it must live past the end
5049 of the function so that we can check it against other
5050 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5051 if (extern_ref && allocation_temporary_p ())
5052 end_temporary_allocation ();
5054 decl = build_decl (VAR_DECL, declarator, type);
5056 C_DECL_VARIABLE_SIZE (decl) = 1;
5059 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5061 DECL_EXTERNAL (decl) = extern_ref;
5062 /* At top level, the presence of a `static' or `register' storage
5063 class specifier, or the absence of all storage class specifiers
5064 makes this declaration a definition (perhaps tentative). Also,
5065 the absence of both `static' and `register' makes it public. */
5066 if (current_binding_level == global_binding_level)
5070 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5071 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5073 /* Not at top level, only `static' makes a static definition. */
5076 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5077 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5080 if (specbits & 1 << (int) RID_ITERATOR)
5081 ITERATOR_P (decl) = 1;
5084 /* Record `register' declaration for warnings on &
5085 and in case doing stupid register allocation. */
5087 if (specbits & (1 << (int) RID_REGISTER))
5088 DECL_REGISTER (decl) = 1;
5090 /* Record constancy and volatility. */
5093 TREE_READONLY (decl) = 1;
5096 TREE_SIDE_EFFECTS (decl) = 1;
5097 TREE_THIS_VOLATILE (decl) = 1;
5099 /* If a type has volatile components, it should be stored in memory.
5100 Otherwise, the fact that those components are volatile
5101 will be ignored, and would even crash the compiler. */
5102 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5103 mark_addressable (decl);
5111 /* Decode the parameter-list info for a function type or function definition.
5112 The argument is the value returned by `get_parm_info' (or made in parse.y
5113 if there is an identifier list instead of a parameter decl list).
5114 These two functions are separate because when a function returns
5115 or receives functions then each is called multiple times but the order
5116 of calls is different. The last call to `grokparms' is always the one
5117 that contains the formal parameter names of a function definition.
5119 Store in `last_function_parms' a chain of the decls of parms.
5120 Also store in `last_function_parm_tags' a chain of the struct, union,
5121 and enum tags declared among the parms.
5123 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5125 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5126 a mere declaration. A nonempty identifier-list gets an error message
5127 when FUNCDEF_FLAG is zero. */
5130 grokparms (parms_info, funcdef_flag)
5134 tree first_parm = TREE_CHAIN (parms_info);
5136 last_function_parms = TREE_PURPOSE (parms_info);
5137 last_function_parm_tags = TREE_VALUE (parms_info);
5139 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5140 && !in_system_header)
5141 warning ("function declaration isn't a prototype");
5144 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5147 pedwarn ("parameter names (without types) in function declaration");
5149 last_function_parms = first_parm;
5156 /* We no longer test FUNCDEF_FLAG.
5157 If the arg types are incomplete in a declaration,
5158 they must include undefined tags.
5159 These tags can never be defined in the scope of the declaration,
5160 so the types can never be completed,
5161 and no call can be compiled successfully. */
5163 /* In a fcn definition, arg types must be complete. */
5166 for (parm = last_function_parms, typelt = first_parm;
5168 parm = TREE_CHAIN (parm))
5169 /* Skip over any enumeration constants declared here. */
5170 if (TREE_CODE (parm) == PARM_DECL)
5172 /* Barf if the parameter itself has an incomplete type. */
5173 tree type = TREE_VALUE (typelt);
5174 if (TYPE_SIZE (type) == 0)
5176 if (funcdef_flag && DECL_NAME (parm) != 0)
5177 error ("parameter `%s' has incomplete type",
5178 IDENTIFIER_POINTER (DECL_NAME (parm)));
5180 warning ("parameter has incomplete type");
5183 TREE_VALUE (typelt) = error_mark_node;
5184 TREE_TYPE (parm) = error_mark_node;
5187 #if 0 /* This has been replaced by parm_tags_warning
5188 which uses a more accurate criterion for what to warn about. */
5191 /* Now warn if is a pointer to an incomplete type. */
5192 while (TREE_CODE (type) == POINTER_TYPE
5193 || TREE_CODE (type) == REFERENCE_TYPE)
5194 type = TREE_TYPE (type);
5195 type = TYPE_MAIN_VARIANT (type);
5196 if (TYPE_SIZE (type) == 0)
5198 if (DECL_NAME (parm) != 0)
5199 warning ("parameter `%s' points to incomplete type",
5200 IDENTIFIER_POINTER (DECL_NAME (parm)));
5202 warning ("parameter points to incomplete type");
5206 typelt = TREE_CHAIN (typelt);
5209 /* Allocate the list of types the way we allocate a type. */
5210 if (first_parm && ! TREE_PERMANENT (first_parm))
5212 /* Construct a copy of the list of types
5213 on the saveable obstack. */
5215 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5216 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5218 return nreverse (result);
5221 /* The list we have is permanent already. */
5227 /* Return a tree_list node with info on a parameter list just parsed.
5228 The TREE_PURPOSE is a chain of decls of those parms.
5229 The TREE_VALUE is a list of structure, union and enum tags defined.
5230 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5231 This tree_list node is later fed to `grokparms'.
5233 VOID_AT_END nonzero means append `void' to the end of the type-list.
5234 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5237 get_parm_info (void_at_end)
5240 register tree decl, t;
5241 register tree types = 0;
5243 tree tags = gettags ();
5244 tree parms = getdecls ();
5246 tree order = current_binding_level->parm_order;
5248 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5249 if (void_at_end && parms != 0
5250 && TREE_CHAIN (parms) == 0
5251 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5252 && DECL_NAME (parms) == 0)
5255 storedecls (NULL_TREE);
5256 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5257 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5260 /* Extract enumerator values and other non-parms declared with the parms.
5261 Likewise any forward parm decls that didn't have real parm decls. */
5262 for (decl = parms; decl; )
5264 tree next = TREE_CHAIN (decl);
5266 if (TREE_CODE (decl) != PARM_DECL)
5268 TREE_CHAIN (decl) = new_parms;
5271 else if (TREE_ASM_WRITTEN (decl))
5273 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5274 TREE_CHAIN (decl) = new_parms;
5280 /* Put the parm decls back in the order they were in in the parm list. */
5281 for (t = order; t; t = TREE_CHAIN (t))
5284 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5286 TREE_CHAIN (TREE_VALUE (t)) = 0;
5289 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5292 /* Store the parmlist in the binding level since the old one
5293 is no longer a valid list. (We have changed the chain pointers.) */
5294 storedecls (new_parms);
5296 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5297 /* There may also be declarations for enumerators if an enumeration
5298 type is declared among the parms. Ignore them here. */
5299 if (TREE_CODE (decl) == PARM_DECL)
5301 /* Since there is a prototype,
5302 args are passed in their declared types. */
5303 tree type = TREE_TYPE (decl);
5304 DECL_ARG_TYPE (decl) = type;
5305 #ifdef PROMOTE_PROTOTYPES
5306 if ((TREE_CODE (type) == INTEGER_TYPE
5307 || TREE_CODE (type) == ENUMERAL_TYPE)
5308 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5309 DECL_ARG_TYPE (decl) = integer_type_node;
5312 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5313 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5314 && DECL_NAME (decl) == 0)
5316 error ("`void' in parameter list must be the entire list");
5322 return saveable_tree_cons (new_parms, tags,
5323 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5325 return saveable_tree_cons (new_parms, tags, nreverse (types));
5328 /* At end of parameter list, warn about any struct, union or enum tags
5329 defined within. Do so because these types cannot ever become complete. */
5332 parmlist_tags_warning ()
5337 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5339 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5340 /* An anonymous union parm type is meaningful as a GNU extension.
5341 So don't warn for that. */
5342 if (code == UNION_TYPE && !pedantic)
5344 if (TREE_PURPOSE (elt) != 0)
5345 warning ("`%s %s' declared inside parameter list",
5346 (code == RECORD_TYPE ? "struct"
5347 : code == UNION_TYPE ? "union"
5349 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5351 warning ("anonymous %s declared inside parameter list",
5352 (code == RECORD_TYPE ? "struct"
5353 : code == UNION_TYPE ? "union"
5358 warning ("its scope is only this definition or declaration,");
5359 warning ("which is probably not what you want.");
5365 /* Get the struct, enum or union (CODE says which) with tag NAME.
5366 Define the tag as a forward-reference if it is not defined. */
5369 xref_tag (code, name)
5370 enum tree_code code;
5373 int temporary = allocation_temporary_p ();
5375 /* If a cross reference is requested, look up the type
5376 already defined for this tag and return it. */
5378 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5379 /* Even if this is the wrong type of tag, return what we found.
5380 There will be an error message anyway, from pending_xref_error.
5381 If we create an empty xref just for an invalid use of the type,
5382 the main result is to create lots of superfluous error messages. */
5386 push_obstacks_nochange ();
5388 if (current_binding_level == global_binding_level && temporary)
5389 end_temporary_allocation ();
5391 /* If no such tag is yet defined, create a forward-reference node
5392 and record it as the "definition".
5393 When a real declaration of this type is found,
5394 the forward-reference will be altered into a real type. */
5396 ref = make_node (code);
5397 if (code == ENUMERAL_TYPE)
5399 /* (In ANSI, Enums can be referred to only if already defined.) */
5401 pedwarn ("ANSI C forbids forward references to `enum' types");
5402 /* Give the type a default layout like unsigned int
5403 to avoid crashing if it does not get defined. */
5404 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5405 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5406 TREE_UNSIGNED (ref) = 1;
5407 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5408 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5409 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5412 pushtag (name, ref);
5419 /* Make sure that the tag NAME is defined *in the current binding level*
5420 at least as a forward reference.
5421 CODE says which kind of tag NAME ought to be.
5423 We also do a push_obstacks_nochange
5424 whose matching pop is in finish_struct. */
5427 start_struct (code, name)
5428 enum tree_code code;
5431 /* If there is already a tag defined at this binding level
5432 (as a forward reference), just return it. */
5434 register tree ref = 0;
5436 push_obstacks_nochange ();
5437 if (current_binding_level == global_binding_level)
5438 end_temporary_allocation ();
5441 ref = lookup_tag (code, name, current_binding_level, 1);
5442 if (ref && TREE_CODE (ref) == code)
5444 C_TYPE_BEING_DEFINED (ref) = 1;
5445 if (TYPE_FIELDS (ref))
5446 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5447 : "redefinition of `struct %s'"),
5448 IDENTIFIER_POINTER (name));
5453 /* Otherwise create a forward-reference just so the tag is in scope. */
5455 ref = make_node (code);
5456 pushtag (name, ref);
5457 C_TYPE_BEING_DEFINED (ref) = 1;
5458 TYPE_PACKED (ref) = flag_pack_struct;
5462 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5463 of a structure component, returning a FIELD_DECL node.
5464 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5466 This is done during the parsing of the struct declaration.
5467 The FIELD_DECL nodes are chained together and the lot of them
5468 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5471 grokfield (filename, line, declarator, declspecs, width)
5474 tree declarator, declspecs, width;
5478 /* The corresponding pop_obstacks is in finish_decl. */
5479 push_obstacks_nochange ();
5481 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5483 finish_decl (value, NULL_TREE, NULL_TREE);
5484 DECL_INITIAL (value) = width;
5486 maybe_objc_check_decl (value);
5490 /* Function to help qsort sort FIELD_DECLs by name order. */
5493 field_decl_cmp (xp, yp)
5494 const GENERIC_PTR xp;
5495 const GENERIC_PTR yp;
5497 tree *x = (tree *)xp, *y = (tree *)yp;
5499 if (DECL_NAME (*x) == DECL_NAME (*y))
5501 if (DECL_NAME (*x) == NULL)
5503 if (DECL_NAME (*y) == NULL)
5505 if (DECL_NAME (*x) < DECL_NAME (*y))
5510 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5511 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5512 ATTRIBUTES are attributes to be applied to the structure.
5514 We also do a pop_obstacks to match the push in start_struct. */
5517 finish_struct (t, fieldlist, attributes)
5524 int toplevel = global_binding_level == current_binding_level;
5526 /* If this type was previously laid out as a forward reference,
5527 make sure we lay it out again. */
5531 decl_attributes (t, attributes, NULL_TREE);
5533 /* Nameless union parm types are useful as GCC extension. */
5534 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5535 /* Otherwise, warn about any struct or union def. in parmlist. */
5536 if (in_parm_level_p ())
5539 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5540 : "structure defined inside parms"));
5541 else if (! flag_traditional)
5542 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5543 : "structure defined inside parms"));
5546 old_momentary = suspend_momentary ();
5550 for (x = fieldlist; x; x = TREE_CHAIN (x))
5551 if (DECL_NAME (x) != 0)
5555 pedwarn ("%s has no %smembers",
5556 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5557 (fieldlist ? "named " : ""));
5560 /* Install struct as DECL_CONTEXT of each field decl.
5561 Also process specified field sizes.
5562 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5563 The specified size is found in the DECL_INITIAL.
5564 Store 0 there, except for ": 0" fields (so we can find them
5565 and delete them, below). */
5567 for (x = fieldlist; x; x = TREE_CHAIN (x))
5569 DECL_CONTEXT (x) = t;
5570 DECL_PACKED (x) |= TYPE_PACKED (t);
5571 DECL_FIELD_SIZE (x) = 0;
5573 /* If any field is const, the structure type is pseudo-const. */
5574 if (TREE_READONLY (x))
5575 C_TYPE_FIELDS_READONLY (t) = 1;
5578 /* A field that is pseudo-const makes the structure likewise. */
5579 tree t1 = TREE_TYPE (x);
5580 while (TREE_CODE (t1) == ARRAY_TYPE)
5581 t1 = TREE_TYPE (t1);
5582 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5583 && C_TYPE_FIELDS_READONLY (t1))
5584 C_TYPE_FIELDS_READONLY (t) = 1;
5587 /* Any field that is volatile means variables of this type must be
5588 treated in some ways as volatile. */
5589 if (TREE_THIS_VOLATILE (x))
5590 C_TYPE_FIELDS_VOLATILE (t) = 1;
5592 /* Any field of nominal variable size implies structure is too. */
5593 if (C_DECL_VARIABLE_SIZE (x))
5594 C_TYPE_VARIABLE_SIZE (t) = 1;
5596 /* Detect invalid nested redefinition. */
5597 if (TREE_TYPE (x) == t)
5598 error ("nested redefinition of `%s'",
5599 IDENTIFIER_POINTER (TYPE_NAME (t)));
5601 /* Detect invalid bit-field size. */
5602 if (DECL_INITIAL (x))
5603 STRIP_NOPS (DECL_INITIAL (x));
5604 if (DECL_INITIAL (x))
5606 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5607 constant_expression_warning (DECL_INITIAL (x));
5610 error_with_decl (x, "bit-field `%s' width not an integer constant");
5611 DECL_INITIAL (x) = NULL;
5615 /* Detect invalid bit-field type. */
5616 if (DECL_INITIAL (x)
5617 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5618 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5620 error_with_decl (x, "bit-field `%s' has invalid type");
5621 DECL_INITIAL (x) = NULL;
5623 if (DECL_INITIAL (x) && pedantic
5624 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5625 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5626 /* Accept an enum that's equivalent to int or unsigned int. */
5627 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5628 && (TYPE_PRECISION (TREE_TYPE (x))
5629 == TYPE_PRECISION (integer_type_node))))
5630 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5632 /* Detect and ignore out of range field width. */
5633 if (DECL_INITIAL (x))
5635 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5637 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5639 DECL_INITIAL (x) = NULL;
5640 error_with_decl (x, "negative width in bit-field `%s'");
5642 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5643 || width > TYPE_PRECISION (TREE_TYPE (x)))
5645 DECL_INITIAL (x) = NULL;
5646 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5648 else if (width == 0 && DECL_NAME (x) != 0)
5650 error_with_decl (x, "zero width for bit-field `%s'");
5651 DECL_INITIAL (x) = NULL;
5655 /* Process valid field width. */
5656 if (DECL_INITIAL (x))
5658 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5660 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5661 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5662 TREE_UNSIGNED (TREE_TYPE (x)))
5663 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5664 TREE_UNSIGNED (TREE_TYPE (x)))))
5665 warning_with_decl (x, "`%s' is narrower than values of its type");
5667 DECL_FIELD_SIZE (x) = width;
5668 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5669 DECL_INITIAL (x) = NULL;
5673 /* field size 0 => force desired amount of alignment. */
5674 #ifdef EMPTY_FIELD_BOUNDARY
5675 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5677 #ifdef PCC_BITFIELD_TYPE_MATTERS
5678 if (PCC_BITFIELD_TYPE_MATTERS)
5679 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5680 TYPE_ALIGN (TREE_TYPE (x)));
5684 else if (TREE_TYPE (x) != error_mark_node)
5686 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5687 : TYPE_ALIGN (TREE_TYPE (x)));
5688 /* Non-bit-fields are aligned for their type, except packed
5689 fields which require only BITS_PER_UNIT alignment. */
5690 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5694 /* Now DECL_INITIAL is null on all members. */
5696 /* Delete all duplicate fields from the fieldlist */
5697 for (x = fieldlist; x && TREE_CHAIN (x);)
5698 /* Anonymous fields aren't duplicates. */
5699 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5703 register tree y = fieldlist;
5707 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5713 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5715 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5716 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5718 else x = TREE_CHAIN (x);
5721 /* Now we have the nearly final fieldlist. Record it,
5722 then lay out the structure or union (including the fields). */
5724 TYPE_FIELDS (t) = fieldlist;
5728 /* Delete all zero-width bit-fields from the front of the fieldlist */
5730 && DECL_INITIAL (fieldlist))
5731 fieldlist = TREE_CHAIN (fieldlist);
5732 /* Delete all such members from the rest of the fieldlist */
5733 for (x = fieldlist; x;)
5735 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5736 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5737 else x = TREE_CHAIN (x);
5740 /* Now we have the truly final field list.
5741 Store it in this type and in the variants. */
5743 TYPE_FIELDS (t) = fieldlist;
5745 /* If there are lots of fields, sort so we can look through them fast.
5746 We arbitrarily consider 16 or more elts to be "a lot". */
5750 for (x = fieldlist; x; x = TREE_CHAIN (x))
5761 len += list_length (x);
5762 /* Use the same allocation policy here that make_node uses, to
5763 ensure that this lives as long as the rest of the struct decl.
5764 All decls in an inline function need to be saved. */
5765 if (allocation_temporary_p ())
5766 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5768 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5770 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5771 TYPE_LANG_SPECIFIC (t)->len = len;
5773 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5775 for (x = fieldlist; x; x = TREE_CHAIN (x))
5776 field_array[len++] = x;
5778 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5782 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5784 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5785 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5786 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5789 /* If this was supposed to be a transparent union, but we can't
5790 make it one, warn and turn off the flag. */
5791 if (TREE_CODE (t) == UNION_TYPE
5792 && TYPE_TRANSPARENT_UNION (t)
5793 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5795 TYPE_TRANSPARENT_UNION (t) = 0;
5796 warning ("union cannot be made transparent");
5799 /* If this structure or union completes the type of any previous
5800 variable declaration, lay it out and output its rtl. */
5802 if (current_binding_level->n_incomplete != 0)
5805 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5807 if (TREE_TYPE (decl) == t
5808 && TREE_CODE (decl) != TYPE_DECL)
5810 layout_decl (decl, 0);
5811 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5812 maybe_objc_check_decl (decl);
5813 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5816 --current_binding_level->n_incomplete;
5818 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5819 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5821 tree element = TREE_TYPE (decl);
5822 while (TREE_CODE (element) == ARRAY_TYPE)
5823 element = TREE_TYPE (element);
5825 layout_array_type (TREE_TYPE (decl));
5830 resume_momentary (old_momentary);
5832 /* Finish debugging output for this type. */
5833 rest_of_type_compilation (t, toplevel);
5835 /* The matching push is in start_struct. */
5841 /* Lay out the type T, and its element type, and so on. */
5844 layout_array_type (t)
5847 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5848 layout_array_type (TREE_TYPE (t));
5852 /* Begin compiling the definition of an enumeration type.
5853 NAME is its name (or null if anonymous).
5854 Returns the type object, as yet incomplete.
5855 Also records info about it so that build_enumerator
5856 may be used to declare the individual values as they are read. */
5862 register tree enumtype = 0;
5864 /* If this is the real definition for a previous forward reference,
5865 fill in the contents in the same object that used to be the
5866 forward reference. */
5869 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5871 /* The corresponding pop_obstacks is in finish_enum. */
5872 push_obstacks_nochange ();
5873 /* If these symbols and types are global, make them permanent. */
5874 if (current_binding_level == global_binding_level)
5875 end_temporary_allocation ();
5877 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5879 enumtype = make_node (ENUMERAL_TYPE);
5880 pushtag (name, enumtype);
5883 C_TYPE_BEING_DEFINED (enumtype) = 1;
5885 if (TYPE_VALUES (enumtype) != 0)
5887 /* This enum is a named one that has been declared already. */
5888 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5890 /* Completely replace its old definition.
5891 The old enumerators remain defined, however. */
5892 TYPE_VALUES (enumtype) = 0;
5895 enum_next_value = integer_zero_node;
5898 if (flag_short_enums)
5899 TYPE_PACKED (enumtype) = 1;
5904 /* After processing and defining all the values of an enumeration type,
5905 install their decls in the enumeration type and finish it off.
5906 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5907 and ATTRIBUTES are the specified attributes.
5908 Returns ENUMTYPE. */
5911 finish_enum (enumtype, values, attributes)
5916 register tree pair, tem;
5917 tree minnode = 0, maxnode = 0;
5918 int lowprec, highprec, precision;
5919 int toplevel = global_binding_level == current_binding_level;
5921 if (in_parm_level_p ())
5922 warning ("enum defined inside parms");
5924 decl_attributes (enumtype, attributes, NULL_TREE);
5926 /* Calculate the maximum value of any enumerator in this type. */
5928 if (values == error_mark_node)
5929 minnode = maxnode = integer_zero_node;
5931 for (pair = values; pair; pair = TREE_CHAIN (pair))
5933 tree value = TREE_VALUE (pair);
5935 minnode = maxnode = TREE_VALUE (pair);
5938 if (tree_int_cst_lt (maxnode, value))
5940 if (tree_int_cst_lt (value, minnode))
5945 TYPE_MIN_VALUE (enumtype) = minnode;
5946 TYPE_MAX_VALUE (enumtype) = maxnode;
5948 /* An enum can have some negative values; then it is signed. */
5949 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5951 /* Determine the precision this type needs. */
5953 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5954 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5955 precision = MAX (lowprec, highprec);
5957 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5959 tree narrowest = type_for_size (precision, 1);
5962 warning ("enumeration values exceed range of largest integer");
5963 narrowest = long_long_integer_type_node;
5966 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5969 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5971 TYPE_SIZE (enumtype) = 0;
5972 layout_type (enumtype);
5974 if (values != error_mark_node)
5976 /* Change the type of the enumerators to be the enum type.
5977 Formerly this was done only for enums that fit in an int,
5978 but the comment said it was done only for enums wider than int.
5979 It seems necessary to do this for wide enums,
5980 and best not to change what's done for ordinary narrower ones. */
5981 for (pair = values; pair; pair = TREE_CHAIN (pair))
5983 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5984 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5985 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5986 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5989 /* Replace the decl nodes in VALUES with their names. */
5990 for (pair = values; pair; pair = TREE_CHAIN (pair))
5991 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5993 TYPE_VALUES (enumtype) = values;
5996 /* Fix up all variant types of this enum type. */
5997 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5999 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6000 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6001 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6002 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6003 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6004 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6005 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6006 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6009 /* Finish debugging output for this type. */
6010 rest_of_type_compilation (enumtype, toplevel);
6012 /* This matches a push in start_enum. */
6018 /* Build and install a CONST_DECL for one value of the
6019 current enumeration type (one that was begun with start_enum).
6020 Return a tree-list containing the CONST_DECL and its value.
6021 Assignment of sequential values by default is handled here. */
6024 build_enumerator (name, value)
6027 register tree decl, type;
6029 /* Validate and default VALUE. */
6031 /* Remove no-op casts from the value. */
6033 STRIP_TYPE_NOPS (value);
6037 if (TREE_CODE (value) == INTEGER_CST)
6039 value = default_conversion (value);
6040 constant_expression_warning (value);
6044 error ("enumerator value for `%s' not integer constant",
6045 IDENTIFIER_POINTER (name));
6050 /* Default based on previous value. */
6051 /* It should no longer be possible to have NON_LVALUE_EXPR
6055 value = enum_next_value;
6057 error ("overflow in enumeration values");
6060 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6062 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6063 value = integer_zero_node;
6066 /* Set basis for default for next value. */
6067 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6068 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6070 /* Now create a declaration for the enum value name. */
6072 type = TREE_TYPE (value);
6073 type = type_for_size (MAX (TYPE_PRECISION (type),
6074 TYPE_PRECISION (integer_type_node)),
6076 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6077 && TREE_UNSIGNED (type)));
6079 decl = build_decl (CONST_DECL, name, type);
6080 DECL_INITIAL (decl) = value;
6081 TREE_TYPE (value) = type;
6084 return saveable_tree_cons (decl, value, NULL_TREE);
6087 /* Create the FUNCTION_DECL for a function definition.
6088 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6089 the declaration; they describe the function's name and the type it returns,
6090 but twisted together in a fashion that parallels the syntax of C.
6092 This function creates a binding context for the function body
6093 as well as setting up the FUNCTION_DECL in current_function_decl.
6095 Returns 1 on success. If the DECLARATOR is not suitable for a function
6096 (it defines a datum instead), we return 0, which tells
6097 yyparse to report a parse error.
6099 NESTED is nonzero for a function nested within another function. */
6102 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6103 tree declarator, declspecs, prefix_attributes, attributes;
6106 tree decl1, old_decl;
6108 int old_immediate_size_expand = immediate_size_expand;
6110 current_function_returns_value = 0; /* Assume, until we see it does. */
6111 current_function_returns_null = 0;
6112 warn_about_return_type = 0;
6113 current_extern_inline = 0;
6114 c_function_varargs = 0;
6116 shadowed_labels = 0;
6118 /* Don't expand any sizes in the return type of the function. */
6119 immediate_size_expand = 0;
6121 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6123 /* If the declarator is not suitable for a function definition,
6124 cause a syntax error. */
6128 decl_attributes (decl1, prefix_attributes, attributes);
6130 announce_function (decl1);
6132 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6134 error ("return-type is an incomplete type");
6135 /* Make it return void instead. */
6137 = build_function_type (void_type_node,
6138 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6141 if (warn_about_return_type)
6142 warning ("return-type defaults to `int'");
6144 /* Save the parm names or decls from this function's declarator
6145 where store_parm_decls will find them. */
6146 current_function_parms = last_function_parms;
6147 current_function_parm_tags = last_function_parm_tags;
6149 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6150 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6151 DECL_INITIAL (decl1) = error_mark_node;
6153 /* If this definition isn't a prototype and we had a prototype declaration
6154 before, copy the arg type info from that prototype.
6155 But not if what we had before was a builtin function. */
6156 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6157 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6158 && !DECL_BUILT_IN (old_decl)
6159 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6160 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6161 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6163 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6164 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6165 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6168 /* If there is no explicit declaration, look for any out-of-scope implicit
6171 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6173 /* Optionally warn of old-fashioned def with no previous prototype. */
6174 if (warn_strict_prototypes
6175 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6176 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6177 warning ("function declaration isn't a prototype");
6178 /* Optionally warn of any global def with no previous prototype. */
6179 else if (warn_missing_prototypes
6180 && TREE_PUBLIC (decl1)
6181 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6182 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6183 warning_with_decl (decl1, "no previous prototype for `%s'");
6184 /* Optionally warn of any def with no previous prototype
6185 if the function has already been used. */
6186 else if (warn_missing_prototypes
6187 && old_decl != 0 && TREE_USED (old_decl)
6188 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6189 warning_with_decl (decl1,
6190 "`%s' was used with no prototype before its definition");
6191 /* Optionally warn of any global def with no previous declaration. */
6192 else if (warn_missing_declarations
6193 && TREE_PUBLIC (decl1)
6195 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6196 warning_with_decl (decl1, "no previous declaration for `%s'");
6197 /* Optionally warn of any def with no previous declaration
6198 if the function has already been used. */
6199 else if (warn_missing_declarations
6200 && old_decl != 0 && TREE_USED (old_decl)
6201 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6202 warning_with_decl (decl1,
6203 "`%s' was used with no declaration before its definition");
6205 /* This is a definition, not a reference.
6206 So normally clear DECL_EXTERNAL.
6207 However, `extern inline' acts like a declaration
6208 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6209 DECL_EXTERNAL (decl1) = current_extern_inline;
6211 /* This function exists in static storage.
6212 (This does not mean `static' in the C sense!) */
6213 TREE_STATIC (decl1) = 1;
6215 /* A nested function is not global. */
6216 if (current_function_decl != 0)
6217 TREE_PUBLIC (decl1) = 0;
6219 /* Record the decl so that the function name is defined.
6220 If we already have a decl for this name, and it is a FUNCTION_DECL,
6221 use the old decl. */
6223 current_function_decl = pushdecl (decl1);
6226 declare_parm_level (1);
6227 current_binding_level->subblocks_tag_transparent = 1;
6229 make_function_rtl (current_function_decl);
6231 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6232 /* Promote the value to int before returning it. */
6233 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6235 /* It retains unsignedness if traditional
6236 or if not really getting wider. */
6237 if (TREE_UNSIGNED (restype)
6238 && (flag_traditional
6239 || (TYPE_PRECISION (restype)
6240 == TYPE_PRECISION (integer_type_node))))
6241 restype = unsigned_type_node;
6243 restype = integer_type_node;
6245 DECL_RESULT (current_function_decl)
6246 = build_decl (RESULT_DECL, NULL_TREE, restype);
6249 /* Allocate further tree nodes temporarily during compilation
6250 of this function only. */
6251 temporary_allocation ();
6253 /* If this fcn was already referenced via a block-scope `extern' decl
6254 (or an implicit decl), propagate certain information about the usage. */
6255 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6256 TREE_ADDRESSABLE (current_function_decl) = 1;
6258 immediate_size_expand = old_immediate_size_expand;
6263 /* Record that this function is going to be a varargs function.
6264 This is called before store_parm_decls, which is too early
6265 to call mark_varargs directly. */
6270 c_function_varargs = 1;
6273 /* Store the parameter declarations into the current function declaration.
6274 This is called after parsing the parameter declarations, before
6275 digesting the body of the function.
6277 For an old-style definition, modify the function's type
6278 to specify at least the number of arguments. */
6283 register tree fndecl = current_function_decl;
6286 /* This is either a chain of PARM_DECLs (if a prototype was used)
6287 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6288 tree specparms = current_function_parms;
6290 /* This is a list of types declared among parms in a prototype. */
6291 tree parmtags = current_function_parm_tags;
6293 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6294 register tree parmdecls = getdecls ();
6296 /* This is a chain of any other decls that came in among the parm
6297 declarations. If a parm is declared with enum {foo, bar} x;
6298 then CONST_DECLs for foo and bar are put here. */
6301 /* Nonzero if this definition is written with a prototype. */
6304 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6306 /* This case is when the function was defined with an ANSI prototype.
6307 The parms already have decls, so we need not do anything here
6308 except record them as in effect
6309 and complain if any redundant old-style parm decls were written. */
6320 error_with_decl (fndecl,
6321 "parm types given both in parmlist and separately");
6322 /* Get rid of the erroneous decls; don't keep them on
6323 the list of parms, since they might not be PARM_DECLs. */
6324 for (decl = current_binding_level->names;
6325 decl; decl = TREE_CHAIN (decl))
6326 if (DECL_NAME (decl))
6327 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6328 for (link = current_binding_level->shadowed;
6329 link; link = TREE_CHAIN (link))
6330 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6331 current_binding_level->names = 0;
6332 current_binding_level->shadowed = 0;
6335 specparms = nreverse (specparms);
6336 for (parm = specparms; parm; parm = next)
6338 next = TREE_CHAIN (parm);
6339 if (TREE_CODE (parm) == PARM_DECL)
6341 if (DECL_NAME (parm) == 0)
6342 error_with_decl (parm, "parameter name omitted");
6343 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6345 error_with_decl (parm, "parameter `%s' declared void");
6346 /* Change the type to error_mark_node so this parameter
6347 will be ignored by assign_parms. */
6348 TREE_TYPE (parm) = error_mark_node;
6354 /* If we find an enum constant or a type tag,
6355 put it aside for the moment. */
6356 TREE_CHAIN (parm) = 0;
6357 others = chainon (others, parm);
6361 /* Get the decls in their original chain order
6362 and record in the function. */
6363 DECL_ARGUMENTS (fndecl) = getdecls ();
6366 /* If this function takes a variable number of arguments,
6367 add a phony parameter to the end of the parm list,
6368 to represent the position of the first unnamed argument. */
6369 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6372 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6373 /* Let's hope the address of the unnamed parm
6374 won't depend on its type. */
6375 TREE_TYPE (dummy) = integer_type_node;
6376 DECL_ARG_TYPE (dummy) = integer_type_node;
6377 DECL_ARGUMENTS (fndecl)
6378 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6382 /* Now pushdecl the enum constants. */
6383 for (parm = others; parm; parm = next)
6385 next = TREE_CHAIN (parm);
6386 if (DECL_NAME (parm) == 0)
6388 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6390 else if (TREE_CODE (parm) != PARM_DECL)
6394 storetags (chainon (parmtags, gettags ()));
6398 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6399 each with a parm name as the TREE_VALUE.
6401 PARMDECLS is a chain of declarations for parameters.
6402 Warning! It can also contain CONST_DECLs which are not parameters
6403 but are names of enumerators of any enum types
6404 declared among the parameters.
6406 First match each formal parameter name with its declaration.
6407 Associate decls with the names and store the decls
6408 into the TREE_PURPOSE slots. */
6410 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6411 DECL_RESULT (parm) = 0;
6413 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6415 register tree tail, found = NULL;
6417 if (TREE_VALUE (parm) == 0)
6419 error_with_decl (fndecl, "parameter name missing from parameter list");
6420 TREE_PURPOSE (parm) = 0;
6424 /* See if any of the parmdecls specifies this parm by name.
6425 Ignore any enumerator decls. */
6426 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6427 if (DECL_NAME (tail) == TREE_VALUE (parm)
6428 && TREE_CODE (tail) == PARM_DECL)
6434 /* If declaration already marked, we have a duplicate name.
6435 Complain, and don't use this decl twice. */
6436 if (found && DECL_RESULT (found) != 0)
6438 error_with_decl (found, "multiple parameters named `%s'");
6442 /* If the declaration says "void", complain and ignore it. */
6443 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6445 error_with_decl (found, "parameter `%s' declared void");
6446 TREE_TYPE (found) = integer_type_node;
6447 DECL_ARG_TYPE (found) = integer_type_node;
6448 layout_decl (found, 0);
6451 /* Traditionally, a parm declared float is actually a double. */
6452 if (found && flag_traditional
6453 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6455 TREE_TYPE (found) = double_type_node;
6456 DECL_ARG_TYPE (found) = double_type_node;
6457 layout_decl (found, 0);
6460 /* If no declaration found, default to int. */
6463 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6465 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6466 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6467 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6469 warning_with_decl (found, "type of `%s' defaults to `int'");
6473 TREE_PURPOSE (parm) = found;
6475 /* Mark this decl as "already found" -- see test, above.
6476 It is safe to use DECL_RESULT for this
6477 since it is not used in PARM_DECLs or CONST_DECLs. */
6478 DECL_RESULT (found) = error_mark_node;
6481 /* Put anything which is on the parmdecls chain and which is
6482 not a PARM_DECL onto the list NONPARMS. (The types of
6483 non-parm things which might appear on the list include
6484 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6485 any actual PARM_DECLs not matched with any names. */
6488 for (parm = parmdecls; parm; )
6490 tree next = TREE_CHAIN (parm);
6491 TREE_CHAIN (parm) = 0;
6493 if (TREE_CODE (parm) != PARM_DECL)
6494 nonparms = chainon (nonparms, parm);
6497 /* Complain about args with incomplete types. */
6498 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6500 error_with_decl (parm, "parameter `%s' has incomplete type");
6501 TREE_TYPE (parm) = error_mark_node;
6504 if (DECL_RESULT (parm) == 0)
6506 error_with_decl (parm,
6507 "declaration for parameter `%s' but no such parameter");
6508 /* Pretend the parameter was not missing.
6509 This gets us to a standard state and minimizes
6510 further error messages. */
6512 = chainon (specparms,
6513 tree_cons (parm, NULL_TREE, NULL_TREE));
6520 /* Chain the declarations together in the order of the list of names. */
6521 /* Store that chain in the function decl, replacing the list of names. */
6523 DECL_ARGUMENTS (fndecl) = 0;
6526 for (last = 0; parm; parm = TREE_CHAIN (parm))
6527 if (TREE_PURPOSE (parm))
6530 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6532 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6533 last = TREE_PURPOSE (parm);
6534 TREE_CHAIN (last) = 0;
6538 /* If there was a previous prototype,
6539 set the DECL_ARG_TYPE of each argument according to
6540 the type previously specified, and report any mismatches. */
6542 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6545 for (parm = DECL_ARGUMENTS (fndecl),
6546 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6547 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6548 != void_type_node));
6549 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6551 if (parm == 0 || type == 0
6552 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6554 error ("number of arguments doesn't match prototype");
6555 error_with_file_and_line (current_function_prototype_file,
6556 current_function_prototype_line,
6557 "prototype declaration");
6560 /* Type for passing arg must be consistent
6561 with that declared for the arg. */
6562 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6564 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6565 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6567 /* Adjust argument to match prototype. E.g. a previous
6568 `int foo(float);' prototype causes
6569 `int foo(x) float x; {...}' to be treated like
6570 `int foo(float x) {...}'. This is particularly
6571 useful for argument types like uid_t. */
6572 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6573 #ifdef PROMOTE_PROTOTYPES
6574 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6575 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6576 && TYPE_PRECISION (TREE_TYPE (parm))
6577 < TYPE_PRECISION (integer_type_node))
6578 DECL_ARG_TYPE (parm) = integer_type_node;
6582 pedwarn ("promoted argument `%s' doesn't match prototype",
6583 IDENTIFIER_POINTER (DECL_NAME (parm)));
6584 warning_with_file_and_line
6585 (current_function_prototype_file,
6586 current_function_prototype_line,
6587 "prototype declaration");
6590 /* If -traditional, allow `int' argument to match
6591 `unsigned' prototype. */
6592 else if (! (flag_traditional
6593 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6594 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6596 error ("argument `%s' doesn't match prototype",
6597 IDENTIFIER_POINTER (DECL_NAME (parm)));
6598 error_with_file_and_line (current_function_prototype_file,
6599 current_function_prototype_line,
6600 "prototype declaration");
6604 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6607 /* Otherwise, create a prototype that would match. */
6611 tree actual = 0, last = 0, type;
6613 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6615 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6618 TREE_CHAIN (last) = type;
6623 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6625 TREE_CHAIN (last) = type;
6629 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6630 of the type of this function, but we need to avoid having this
6631 affect the types of other similarly-typed functions, so we must
6632 first force the generation of an identical (but separate) type
6633 node for the relevant function type. The new node we create
6634 will be a variant of the main variant of the original function
6637 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6639 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6642 /* Now store the final chain of decls for the arguments
6643 as the decl-chain of the current lexical scope.
6644 Put the enumerators in as well, at the front so that
6645 DECL_ARGUMENTS is not modified. */
6647 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6650 /* Make sure the binding level for the top of the function body
6651 gets a BLOCK if there are any in the function.
6652 Otherwise, the dbx output is wrong. */
6654 keep_next_if_subblocks = 1;
6656 /* ??? This might be an improvement,
6657 but needs to be thought about some more. */
6659 keep_next_level_flag = 1;
6662 /* Write a record describing this function definition to the prototypes
6663 file (if requested). */
6665 gen_aux_info_record (fndecl, 1, 0, prototype);
6667 /* Initialize the RTL code for the function. */
6669 init_function_start (fndecl, input_filename, lineno);
6671 /* If this is a varargs function, inform function.c. */
6673 if (c_function_varargs)
6676 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6678 declare_function_name ();
6680 /* Set up parameters and prepare for return, for the function. */
6682 expand_function_start (fndecl, 0);
6684 /* If this function is `main', emit a call to `__main'
6685 to run global initializers, etc. */
6686 if (DECL_NAME (fndecl)
6687 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6688 && DECL_CONTEXT (fndecl) == NULL_TREE)
6689 expand_main_function ();
6692 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6693 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6694 stands for an ellipsis in the identifier list.
6696 PARMLIST is the data returned by get_parm_info for the
6697 parmlist that follows the semicolon.
6699 We return a value of the same sort that get_parm_info returns,
6700 except that it describes the combination of identifiers and parmlist. */
6703 combine_parm_decls (specparms, parmlist, void_at_end)
6704 tree specparms, parmlist;
6707 register tree fndecl = current_function_decl;
6710 tree parmdecls = TREE_PURPOSE (parmlist);
6712 /* This is a chain of any other decls that came in among the parm
6713 declarations. They were separated already by get_parm_info,
6714 so we just need to keep them separate. */
6715 tree nonparms = TREE_VALUE (parmlist);
6719 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6720 DECL_RESULT (parm) = 0;
6722 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6724 register tree tail, found = NULL;
6726 /* See if any of the parmdecls specifies this parm by name. */
6727 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6728 if (DECL_NAME (tail) == TREE_VALUE (parm))
6734 /* If declaration already marked, we have a duplicate name.
6735 Complain, and don't use this decl twice. */
6736 if (found && DECL_RESULT (found) != 0)
6738 error_with_decl (found, "multiple parameters named `%s'");
6742 /* If the declaration says "void", complain and ignore it. */
6743 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6745 error_with_decl (found, "parameter `%s' declared void");
6746 TREE_TYPE (found) = integer_type_node;
6747 DECL_ARG_TYPE (found) = integer_type_node;
6748 layout_decl (found, 0);
6751 /* Traditionally, a parm declared float is actually a double. */
6752 if (found && flag_traditional
6753 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6755 TREE_TYPE (found) = double_type_node;
6756 DECL_ARG_TYPE (found) = double_type_node;
6757 layout_decl (found, 0);
6760 /* If no declaration found, default to int. */
6763 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6765 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6766 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6767 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6768 error_with_decl (found, "type of parameter `%s' is not declared");
6772 TREE_PURPOSE (parm) = found;
6774 /* Mark this decl as "already found" -- see test, above.
6775 It is safe to use DECL_RESULT for this
6776 since it is not used in PARM_DECLs or CONST_DECLs. */
6777 DECL_RESULT (found) = error_mark_node;
6780 /* Complain about any actual PARM_DECLs not matched with any names. */
6782 for (parm = parmdecls; parm; )
6784 tree next = TREE_CHAIN (parm);
6785 TREE_CHAIN (parm) = 0;
6787 /* Complain about args with incomplete types. */
6788 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6790 error_with_decl (parm, "parameter `%s' has incomplete type");
6791 TREE_TYPE (parm) = error_mark_node;
6794 if (DECL_RESULT (parm) == 0)
6796 error_with_decl (parm,
6797 "declaration for parameter `%s' but no such parameter");
6798 /* Pretend the parameter was not missing.
6799 This gets us to a standard state and minimizes
6800 further error messages. */
6802 = chainon (specparms,
6803 tree_cons (parm, NULL_TREE, NULL_TREE));
6809 /* Chain the declarations together in the order of the list of names.
6810 At the same time, build up a list of their types, in reverse order. */
6816 for (last = 0; parm; parm = TREE_CHAIN (parm))
6817 if (TREE_PURPOSE (parm))
6820 parmdecls = TREE_PURPOSE (parm);
6822 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6823 last = TREE_PURPOSE (parm);
6824 TREE_CHAIN (last) = 0;
6826 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6831 return saveable_tree_cons (parmdecls, nonparms,
6832 nreverse (saveable_tree_cons (NULL_TREE,
6836 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6839 /* Finish up a function declaration and compile that function
6840 all the way to assembler language output. The free the storage
6841 for the function definition.
6843 This is called after parsing the body of the function definition.
6845 NESTED is nonzero if the function being finished is nested in another. */
6848 finish_function (nested)
6851 register tree fndecl = current_function_decl;
6853 /* TREE_READONLY (fndecl) = 1;
6854 This caused &foo to be of type ptr-to-const-function
6855 which then got a warning when stored in a ptr-to-function variable. */
6858 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6860 /* Must mark the RESULT_DECL as being in this function. */
6862 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6864 /* Obey `register' declarations if `setjmp' is called in this fn. */
6865 if (flag_traditional && current_function_calls_setjmp)
6867 setjmp_protect (DECL_INITIAL (fndecl));
6868 setjmp_protect_args ();
6871 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6873 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6874 != integer_type_node)
6875 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6878 #ifdef DEFAULT_MAIN_RETURN
6879 /* Make it so that `main' always returns success by default. */
6880 DEFAULT_MAIN_RETURN;
6885 /* Generate rtl for function exit. */
6886 expand_function_end (input_filename, lineno, 0);
6888 /* So we can tell if jump_optimize sets it to 1. */
6891 /* Run the optimizers and output the assembler code for this function. */
6892 rest_of_compilation (fndecl);
6894 current_function_returns_null |= can_reach_end;
6896 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6897 warning ("`noreturn' function does return");
6898 else if (warn_return_type && can_reach_end
6899 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6900 /* If this function returns non-void and control can drop through,
6902 warning ("control reaches end of non-void function");
6903 /* With just -W, complain only if function returns both with
6904 and without a value. */
6905 else if (extra_warnings
6906 && current_function_returns_value && current_function_returns_null)
6907 warning ("this function may return with or without a value");
6909 /* If requested, warn about function definitions where the function will
6910 return a value (usually of some struct or union type) which itself will
6911 take up a lot of stack space. */
6913 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6915 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6919 register tree ret_type_size = TYPE_SIZE (ret_type);
6921 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6924 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6926 if (units > larger_than_size)
6927 warning_with_decl (fndecl,
6928 "size of return value of `%s' is %u bytes",
6934 /* Free all the tree nodes making up this function. */
6935 /* Switch back to allocating nodes permanently
6936 until we start another function. */
6938 permanent_allocation (1);
6940 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6942 /* Stop pointing to the local nodes about to be freed. */
6943 /* But DECL_INITIAL must remain nonzero so we know this
6944 was an actual function definition. */
6945 /* For a nested function, this is done in pop_c_function_context. */
6946 /* If rest_of_compilation set this to 0, leave it 0. */
6947 if (DECL_INITIAL (fndecl) != 0)
6948 DECL_INITIAL (fndecl) = error_mark_node;
6949 DECL_ARGUMENTS (fndecl) = 0;
6952 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6954 #ifndef ASM_OUTPUT_CONSTRUCTOR
6955 if (! flag_gnu_linker)
6956 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6959 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6961 if (DECL_STATIC_DESTRUCTOR (fndecl))
6963 #ifndef ASM_OUTPUT_DESTRUCTOR
6964 if (! flag_gnu_linker)
6965 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6968 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6973 /* Let the error reporting routines know that we're outside a
6974 function. For a nested function, this value is used in
6975 pop_c_function_context and then reset via pop_function_context. */
6976 current_function_decl = NULL;
6980 /* Save and restore the variables in this file and elsewhere
6981 that keep track of the progress of compilation of the current function.
6982 Used for nested functions. */
6986 struct c_function *next;
6988 tree shadowed_labels;
6991 int warn_about_return_type;
6993 struct binding_level *binding_level;
6996 struct c_function *c_function_chain;
6998 /* Save and reinitialize the variables
6999 used during compilation of a C function. */
7002 push_c_function_context ()
7004 struct c_function *p
7005 = (struct c_function *) xmalloc (sizeof (struct c_function));
7008 pedwarn ("ANSI C forbids nested functions");
7010 push_function_context ();
7012 p->next = c_function_chain;
7013 c_function_chain = p;
7015 p->named_labels = named_labels;
7016 p->shadowed_labels = shadowed_labels;
7017 p->returns_value = current_function_returns_value;
7018 p->returns_null = current_function_returns_null;
7019 p->warn_about_return_type = warn_about_return_type;
7020 p->extern_inline = current_extern_inline;
7021 p->binding_level = current_binding_level;
7024 /* Restore the variables used during compilation of a C function. */
7027 pop_c_function_context ()
7029 struct c_function *p = c_function_chain;
7032 /* Bring back all the labels that were shadowed. */
7033 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7034 if (DECL_NAME (TREE_VALUE (link)) != 0)
7035 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7036 = TREE_VALUE (link);
7038 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7040 /* Stop pointing to the local nodes about to be freed. */
7041 /* But DECL_INITIAL must remain nonzero so we know this
7042 was an actual function definition. */
7043 DECL_INITIAL (current_function_decl) = error_mark_node;
7044 DECL_ARGUMENTS (current_function_decl) = 0;
7047 pop_function_context ();
7049 c_function_chain = p->next;
7051 named_labels = p->named_labels;
7052 shadowed_labels = p->shadowed_labels;
7053 current_function_returns_value = p->returns_value;
7054 current_function_returns_null = p->returns_null;
7055 warn_about_return_type = p->warn_about_return_type;
7056 current_extern_inline = p->extern_inline;
7057 current_binding_level = p->binding_level;
7062 /* integrate_decl_tree calls this function, but since we don't use the
7063 DECL_LANG_SPECIFIC field, this is a no-op. */
7066 copy_lang_decl (node)