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;
1008 push_function_context ();
1009 output_inline_function (decl);
1010 pop_function_context ();
1014 /* If there were any declarations or structure tags in that level,
1015 or if this level is a function body,
1016 create a BLOCK to record them for the life of this function. */
1019 block_previously_created = (current_binding_level->this_block != 0);
1020 if (block_previously_created)
1021 block = current_binding_level->this_block;
1022 else if (keep || functionbody
1023 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1024 block = make_node (BLOCK);
1027 BLOCK_VARS (block) = decls;
1028 BLOCK_TYPE_TAGS (block) = tags;
1029 BLOCK_SUBBLOCKS (block) = subblocks;
1030 remember_end_note (block);
1033 /* In each subblock, record that this is its superior. */
1035 for (link = subblocks; link; link = TREE_CHAIN (link))
1036 BLOCK_SUPERCONTEXT (link) = block;
1038 /* Clear out the meanings of the local variables of this level. */
1040 for (link = decls; link; link = TREE_CHAIN (link))
1042 if (DECL_NAME (link) != 0)
1044 /* If the ident. was used or addressed via a local extern decl,
1045 don't forget that fact. */
1046 if (DECL_EXTERNAL (link))
1048 if (TREE_USED (link))
1049 TREE_USED (DECL_NAME (link)) = 1;
1050 if (TREE_ADDRESSABLE (link))
1051 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1053 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1057 /* Restore all name-meanings of the outer levels
1058 that were shadowed by this level. */
1060 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1061 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1063 /* If the level being exited is the top level of a function,
1064 check over all the labels, and clear out the current
1065 (function local) meanings of their names. */
1069 clear_limbo_values (block);
1071 /* If this is the top level block of a function,
1072 the vars are the function's parameters.
1073 Don't leave them in the BLOCK because they are
1074 found in the FUNCTION_DECL instead. */
1076 BLOCK_VARS (block) = 0;
1078 /* Clear out the definitions of all label names,
1079 since their scopes end here,
1080 and add them to BLOCK_VARS. */
1082 for (link = named_labels; link; link = TREE_CHAIN (link))
1084 register tree label = TREE_VALUE (link);
1086 if (DECL_INITIAL (label) == 0)
1088 error_with_decl (label, "label `%s' used but not defined");
1089 /* Avoid crashing later. */
1090 define_label (input_filename, lineno,
1093 else if (warn_unused && !TREE_USED (label))
1094 warning_with_decl (label, "label `%s' defined but not used");
1095 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1097 /* Put the labels into the "variables" of the
1098 top-level block, so debugger can see them. */
1099 TREE_CHAIN (label) = BLOCK_VARS (block);
1100 BLOCK_VARS (block) = label;
1104 /* Pop the current level, and free the structure for reuse. */
1107 register struct binding_level *level = current_binding_level;
1108 current_binding_level = current_binding_level->level_chain;
1110 level->level_chain = free_binding_level;
1111 free_binding_level = level;
1114 /* Dispose of the block that we just made inside some higher level. */
1116 DECL_INITIAL (current_function_decl) = block;
1119 if (!block_previously_created)
1120 current_binding_level->blocks
1121 = chainon (current_binding_level->blocks, block);
1123 /* If we did not make a block for the level just exited,
1124 any blocks made for inner levels
1125 (since they cannot be recorded as subblocks in that level)
1126 must be carried forward so they will later become subblocks
1127 of something else. */
1129 current_binding_level->blocks
1130 = chainon (current_binding_level->blocks, subblocks);
1132 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1133 binding contour so that they point to the appropriate construct, i.e.
1134 either to the current FUNCTION_DECL node, or else to the BLOCK node
1135 we just constructed.
1137 Note that for tagged types whose scope is just the formal parameter
1138 list for some function type specification, we can't properly set
1139 their TYPE_CONTEXTs here, because we don't have a pointer to the
1140 appropriate FUNCTION_TYPE node readily available to us. For those
1141 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1142 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1143 node which will represent the "scope" for these "parameter list local"
1148 for (link = tags; link; link = TREE_CHAIN (link))
1149 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1151 for (link = tags; link; link = TREE_CHAIN (link))
1152 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1155 TREE_USED (block) = 1;
1159 /* Delete the node BLOCK from the current binding level.
1160 This is used for the block inside a stmt expr ({...})
1161 so that the block can be reinserted where appropriate. */
1164 delete_block (block)
1168 if (current_binding_level->blocks == block)
1169 current_binding_level->blocks = TREE_CHAIN (block);
1170 for (t = current_binding_level->blocks; t;)
1172 if (TREE_CHAIN (t) == block)
1173 TREE_CHAIN (t) = TREE_CHAIN (block);
1177 TREE_CHAIN (block) = NULL;
1178 /* Clear TREE_USED which is always set by poplevel.
1179 The flag is set again if insert_block is called. */
1180 TREE_USED (block) = 0;
1183 /* Insert BLOCK at the end of the list of subblocks of the
1184 current binding level. This is used when a BIND_EXPR is expanded,
1185 to handle the BLOCK node inside the BIND_EXPR. */
1188 insert_block (block)
1191 TREE_USED (block) = 1;
1192 current_binding_level->blocks
1193 = chainon (current_binding_level->blocks, block);
1196 /* Set the BLOCK node for the innermost scope
1197 (the one we are currently in). */
1201 register tree block;
1203 current_binding_level->this_block = block;
1209 register struct binding_level *newlevel;
1211 /* Reuse or create a struct for this binding level. */
1213 if (free_binding_level)
1215 newlevel = free_binding_level;
1216 free_binding_level = free_binding_level->level_chain;
1220 newlevel = make_binding_level ();
1223 /* Add this level to the front of the chain (stack) of label levels. */
1225 newlevel->level_chain = label_level_chain;
1226 label_level_chain = newlevel;
1228 newlevel->names = named_labels;
1229 newlevel->shadowed = shadowed_labels;
1231 shadowed_labels = 0;
1237 register struct binding_level *level = label_level_chain;
1240 /* Clear out the definitions of the declared labels in this level.
1241 Leave in the list any ordinary, non-declared labels. */
1242 for (link = named_labels, prev = 0; link;)
1244 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1246 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1248 error_with_decl (TREE_VALUE (link),
1249 "label `%s' used but not defined");
1250 /* Avoid crashing later. */
1251 define_label (input_filename, lineno,
1252 DECL_NAME (TREE_VALUE (link)));
1254 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1255 warning_with_decl (TREE_VALUE (link),
1256 "label `%s' defined but not used");
1257 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1259 /* Delete this element from the list. */
1260 link = TREE_CHAIN (link);
1262 TREE_CHAIN (prev) = link;
1264 named_labels = link;
1269 link = TREE_CHAIN (link);
1273 /* Bring back all the labels that were shadowed. */
1274 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1275 if (DECL_NAME (TREE_VALUE (link)) != 0)
1276 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1277 = TREE_VALUE (link);
1279 named_labels = chainon (named_labels, level->names);
1280 shadowed_labels = level->shadowed;
1282 /* Pop the current level, and free the structure for reuse. */
1283 label_level_chain = label_level_chain->level_chain;
1284 level->level_chain = free_binding_level;
1285 free_binding_level = level;
1288 /* Push a definition or a declaration of struct, union or enum tag "name".
1289 "type" should be the type node.
1290 We assume that the tag "name" is not already defined.
1292 Note that the definition may really be just a forward reference.
1293 In that case, the TYPE_SIZE will be zero. */
1296 pushtag (name, type)
1299 register struct binding_level *b;
1301 /* Find the proper binding level for this type tag. */
1303 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1308 /* Record the identifier as the type's name if it has none. */
1310 if (TYPE_NAME (type) == 0)
1311 TYPE_NAME (type) = name;
1314 if (b == global_binding_level)
1315 b->tags = perm_tree_cons (name, type, b->tags);
1317 b->tags = saveable_tree_cons (name, type, b->tags);
1319 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1320 tagged type we just added to the current binding level. This fake
1321 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1322 to output a representation of a tagged type, and it also gives
1323 us a convenient place to record the "scope start" address for the
1326 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1329 /* Handle when a new declaration NEWDECL
1330 has the same name as an old one OLDDECL
1331 in the same binding contour.
1332 Prints an error message if appropriate.
1334 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1335 Otherwise, return 0.
1337 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1338 and OLDDECL is in an outer binding level and should thus not be changed. */
1341 duplicate_decls (newdecl, olddecl, different_binding_level)
1342 register tree newdecl, olddecl;
1343 int different_binding_level;
1345 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1346 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1347 && DECL_INITIAL (newdecl) != 0);
1348 tree oldtype = TREE_TYPE (olddecl);
1349 tree newtype = TREE_TYPE (newdecl);
1352 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1353 DECL_MACHINE_ATTRIBUTES (newdecl) = DECL_MACHINE_ATTRIBUTES (olddecl);
1355 if (TREE_CODE (newtype) == ERROR_MARK
1356 || TREE_CODE (oldtype) == ERROR_MARK)
1359 /* New decl is completely inconsistent with the old one =>
1360 tell caller to replace the old one.
1361 This is always an error except in the case of shadowing a builtin. */
1362 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1364 if (TREE_CODE (olddecl) == FUNCTION_DECL
1365 && (DECL_BUILT_IN (olddecl)
1366 || DECL_BUILT_IN_NONANSI (olddecl)))
1368 /* If you declare a built-in or predefined function name as static,
1369 the old definition is overridden,
1370 but optionally warn this was a bad choice of name. */
1371 if (!TREE_PUBLIC (newdecl))
1375 else if (DECL_BUILT_IN (olddecl))
1376 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1378 warning_with_decl (newdecl, "shadowing library function `%s'");
1380 /* Likewise, if the built-in is not ansi, then programs can
1381 override it even globally without an error. */
1382 else if (! DECL_BUILT_IN (olddecl))
1383 warning_with_decl (newdecl,
1384 "library function `%s' declared as non-function");
1386 else if (DECL_BUILT_IN_NONANSI (olddecl))
1387 warning_with_decl (newdecl,
1388 "built-in function `%s' declared as non-function");
1390 warning_with_decl (newdecl,
1391 "built-in function `%s' declared as non-function");
1395 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1396 error_with_decl (olddecl, "previous declaration of `%s'");
1402 /* For real parm decl following a forward decl,
1403 return 1 so old decl will be reused. */
1404 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1405 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1408 /* The new declaration is the same kind of object as the old one.
1409 The declarations may partially match. Print warnings if they don't
1410 match enough. Ultimately, copy most of the information from the new
1411 decl to the old one, and keep using the old one. */
1413 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1414 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1415 && DECL_INITIAL (olddecl) == 0)
1416 /* If -traditional, avoid error for redeclaring fcn
1417 after implicit decl. */
1419 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1420 && DECL_BUILT_IN (olddecl))
1422 /* A function declaration for a built-in function. */
1423 if (!TREE_PUBLIC (newdecl))
1425 /* If you declare a built-in function name as static, the
1426 built-in definition is overridden,
1427 but optionally warn this was a bad choice of name. */
1429 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1430 /* Discard the old built-in function. */
1433 else if (!types_match)
1435 /* Accept the return type of the new declaration if same modes. */
1436 tree oldreturntype = TREE_TYPE (oldtype);
1437 tree newreturntype = TREE_TYPE (newtype);
1439 /* Make sure we put the new type in the same obstack as the old ones.
1440 If the old types are not both in the same obstack, use the
1442 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1443 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1446 push_obstacks_nochange ();
1447 end_temporary_allocation ();
1450 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1452 /* Function types may be shared, so we can't just modify
1453 the return type of olddecl's function type. */
1455 = build_function_type (newreturntype,
1456 TYPE_ARG_TYPES (oldtype));
1458 types_match = comptypes (newtype, trytype);
1462 /* Accept harmless mismatch in first argument type also.
1464 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1465 && TYPE_ARG_TYPES (oldtype) != 0
1466 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1467 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1468 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1469 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1471 /* Function types may be shared, so we can't just modify
1472 the return type of olddecl's function type. */
1474 = build_function_type (TREE_TYPE (oldtype),
1475 tree_cons (NULL_TREE,
1476 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1477 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1479 types_match = comptypes (newtype, trytype);
1483 if (! different_binding_level)
1484 TREE_TYPE (olddecl) = oldtype;
1490 /* If types don't match for a built-in, throw away the built-in. */
1491 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1495 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1496 && DECL_SOURCE_LINE (olddecl) == 0)
1498 /* A function declaration for a predeclared function
1499 that isn't actually built in. */
1500 if (!TREE_PUBLIC (newdecl))
1502 /* If you declare it as static, the
1503 default definition is overridden. */
1506 else if (!types_match)
1508 /* If the types don't match, preserve volatility indication.
1509 Later on, we will discard everything else about the
1510 default declaration. */
1511 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1514 /* Permit char *foo () to match void *foo (...) if not pedantic,
1515 if one of them came from a system header file. */
1516 else if (!types_match
1517 && TREE_CODE (olddecl) == FUNCTION_DECL
1518 && TREE_CODE (newdecl) == FUNCTION_DECL
1519 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1520 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1521 && (DECL_IN_SYSTEM_HEADER (olddecl)
1522 || DECL_IN_SYSTEM_HEADER (newdecl))
1523 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1524 && TYPE_ARG_TYPES (oldtype) == 0
1525 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1526 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1528 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1529 && TYPE_ARG_TYPES (newtype) == 0
1530 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1531 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1534 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1535 /* Make sure we keep void * as ret type, not char *. */
1536 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1537 TREE_TYPE (newdecl) = newtype = oldtype;
1539 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1540 we will come back here again. */
1541 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1543 else if (!types_match
1544 /* Permit char *foo (int, ...); followed by char *foo ();
1546 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1548 /* Return types must still match. */
1549 && comptypes (TREE_TYPE (oldtype),
1550 TREE_TYPE (newtype))
1551 && TYPE_ARG_TYPES (newtype) == 0))
1553 error_with_decl (newdecl, "conflicting types for `%s'");
1554 /* Check for function type mismatch
1555 involving an empty arglist vs a nonempty one. */
1556 if (TREE_CODE (olddecl) == FUNCTION_DECL
1557 && comptypes (TREE_TYPE (oldtype),
1558 TREE_TYPE (newtype))
1559 && ((TYPE_ARG_TYPES (oldtype) == 0
1560 && DECL_INITIAL (olddecl) == 0)
1562 (TYPE_ARG_TYPES (newtype) == 0
1563 && DECL_INITIAL (newdecl) == 0)))
1565 /* Classify the problem further. */
1566 register tree t = TYPE_ARG_TYPES (oldtype);
1568 t = TYPE_ARG_TYPES (newtype);
1569 for (; t; t = TREE_CHAIN (t))
1571 register tree type = TREE_VALUE (t);
1573 if (TREE_CHAIN (t) == 0
1574 && TYPE_MAIN_VARIANT (type) != void_type_node)
1576 error ("A parameter list with an ellipsis can't match");
1577 error ("an empty parameter name list declaration.");
1581 if (TYPE_MAIN_VARIANT (type) == float_type_node
1582 || C_PROMOTING_INTEGER_TYPE_P (type))
1584 error ("An argument type that has a default promotion");
1585 error ("can't match an empty parameter name list declaration.");
1590 error_with_decl (olddecl, "previous declaration of `%s'");
1594 errmsg = redeclaration_error_message (newdecl, olddecl);
1597 error_with_decl (newdecl, errmsg);
1598 error_with_decl (olddecl,
1599 ((DECL_INITIAL (olddecl)
1600 && current_binding_level == global_binding_level)
1601 ? "`%s' previously defined here"
1602 : "`%s' previously declared here"));
1604 else if (TREE_CODE (newdecl) == TYPE_DECL
1605 && (DECL_IN_SYSTEM_HEADER (olddecl)
1606 || DECL_IN_SYSTEM_HEADER (newdecl)))
1608 warning_with_decl (newdecl, "redefinition of `%s'");
1611 ((DECL_INITIAL (olddecl)
1612 && current_binding_level == global_binding_level)
1613 ? "`%s' previously defined here"
1614 : "`%s' previously declared here"));
1616 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1617 && DECL_INITIAL (olddecl) != 0
1618 && TYPE_ARG_TYPES (oldtype) == 0
1619 && TYPE_ARG_TYPES (newtype) != 0
1620 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1622 register tree type, parm;
1624 /* Prototype decl follows defn w/o prototype. */
1626 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1627 type = TYPE_ARG_TYPES (newtype),
1629 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1630 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1631 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1633 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1634 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1636 errmsg = "prototype for `%s' follows and number of arguments";
1639 /* Type for passing arg must be consistent
1640 with that declared for the arg. */
1641 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1642 /* If -traditional, allow `unsigned int' instead of `int'
1643 in the prototype. */
1644 && (! (flag_traditional
1645 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1646 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1648 errmsg = "prototype for `%s' follows and argument %d";
1654 error_with_decl (newdecl, errmsg, nargs);
1655 error_with_decl (olddecl,
1656 "doesn't match non-prototype definition here");
1660 warning_with_decl (newdecl, "prototype for `%s' follows");
1661 warning_with_decl (olddecl, "non-prototype definition here");
1664 /* Warn about mismatches in various flags. */
1667 /* Warn if function is now inline
1668 but was previously declared not inline and has been called. */
1669 if (TREE_CODE (olddecl) == FUNCTION_DECL
1670 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1671 && TREE_USED (olddecl))
1672 warning_with_decl (newdecl,
1673 "`%s' declared inline after being called");
1674 if (TREE_CODE (olddecl) == FUNCTION_DECL
1675 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1676 && DECL_INITIAL (olddecl) != 0)
1677 warning_with_decl (newdecl,
1678 "`%s' declared inline after its definition");
1680 /* If pedantic, warn when static declaration follows a non-static
1681 declaration. Otherwise, do so only for functions. */
1682 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1683 && TREE_PUBLIC (olddecl)
1684 && !TREE_PUBLIC (newdecl))
1685 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1687 /* Warn when const declaration follows a non-const
1688 declaration, but not for functions. */
1689 if (TREE_CODE (olddecl) != FUNCTION_DECL
1690 && !TREE_READONLY (olddecl)
1691 && TREE_READONLY (newdecl))
1692 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1693 /* These bits are logically part of the type, for variables.
1694 But not for functions
1695 (where qualifiers are not valid ANSI anyway). */
1696 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1697 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1698 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1699 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1703 /* Optionally warn about more than one declaration for the same name. */
1704 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1705 /* Dont warn about a function declaration
1706 followed by a definition. */
1707 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1708 && DECL_INITIAL (olddecl) == 0)
1709 /* Don't warn about extern decl followed by (tentative) definition. */
1710 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1712 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1713 warning_with_decl (olddecl, "previous declaration of `%s'");
1716 /* Copy all the DECL_... slots specified in the new decl
1717 except for any that we copy here from the old type.
1719 Past this point, we don't change OLDTYPE and NEWTYPE
1720 even if we change the types of NEWDECL and OLDDECL. */
1724 /* When copying info to olddecl, we store into write_olddecl
1725 instead. This allows us to avoid modifying olddecl when
1726 different_binding_level is true. */
1727 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1729 /* Make sure we put the new type in the same obstack as the old ones.
1730 If the old types are not both in the same obstack, use the permanent
1732 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1733 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1736 push_obstacks_nochange ();
1737 end_temporary_allocation ();
1740 /* Merge the data types specified in the two decls. */
1741 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1743 if (different_binding_level)
1745 = build_type_attribute_variant
1747 merge_attributes (TYPE_ATTRIBUTES (newtype),
1748 TYPE_ATTRIBUTES (oldtype)));
1751 = TREE_TYPE (olddecl)
1752 = common_type (newtype, oldtype);
1755 /* Lay the type out, unless already done. */
1756 if (oldtype != TREE_TYPE (newdecl))
1758 if (TREE_TYPE (newdecl) != error_mark_node)
1759 layout_type (TREE_TYPE (newdecl));
1760 if (TREE_CODE (newdecl) != FUNCTION_DECL
1761 && TREE_CODE (newdecl) != TYPE_DECL
1762 && TREE_CODE (newdecl) != CONST_DECL)
1763 layout_decl (newdecl, 0);
1767 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1768 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1769 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1770 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1771 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1774 /* Keep the old rtl since we can safely use it. */
1775 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1777 /* Merge the type qualifiers. */
1778 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1779 && !TREE_THIS_VOLATILE (newdecl))
1780 TREE_THIS_VOLATILE (write_olddecl) = 0;
1781 if (TREE_READONLY (newdecl))
1782 TREE_READONLY (write_olddecl) = 1;
1783 if (TREE_THIS_VOLATILE (newdecl))
1785 TREE_THIS_VOLATILE (write_olddecl) = 1;
1786 if (TREE_CODE (newdecl) == VAR_DECL)
1787 make_var_volatile (newdecl);
1790 /* Keep source location of definition rather than declaration. */
1791 /* When called with different_binding_level set, keep the old
1792 information so that meaningful diagnostics can be given. */
1793 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1794 && ! different_binding_level)
1796 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1797 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1800 /* Merge the unused-warning information. */
1801 if (DECL_IN_SYSTEM_HEADER (olddecl))
1802 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1803 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1804 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1806 /* Merge the initialization information. */
1807 /* When called with different_binding_level set, don't copy over
1808 DECL_INITIAL, so that we don't accidentally change function
1809 declarations into function definitions. */
1810 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1811 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1813 /* Merge the section attribute.
1814 We want to issue an error if the sections conflict but that must be
1815 done later in decl_attributes since we are called before attributes
1817 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1818 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1820 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1822 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1823 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1828 /* If cannot merge, then use the new type and qualifiers,
1829 and don't preserve the old rtl. */
1830 else if (! different_binding_level)
1832 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1833 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1834 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1835 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1838 /* Merge the storage class information. */
1839 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1840 /* For functions, static overrides non-static. */
1841 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1843 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1844 /* This is since we don't automatically
1845 copy the attributes of NEWDECL into OLDDECL. */
1846 /* No need to worry about different_binding_level here because
1847 then TREE_PUBLIC (newdecl) was true. */
1848 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1849 /* If this clears `static', clear it in the identifier too. */
1850 if (! TREE_PUBLIC (olddecl))
1851 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1853 if (DECL_EXTERNAL (newdecl))
1855 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1856 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1857 /* An extern decl does not override previous storage class. */
1858 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1859 if (! DECL_EXTERNAL (newdecl))
1860 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1864 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1865 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1868 /* If either decl says `inline', this fn is inline,
1869 unless its definition was passed already. */
1870 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1871 DECL_INLINE (olddecl) = 1;
1872 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1874 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1876 if (DECL_BUILT_IN (olddecl))
1878 /* Get rid of any built-in function if new arg types don't match it
1879 or if we have a function definition. */
1880 if (! types_match || new_is_definition)
1882 if (! different_binding_level)
1884 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1885 DECL_BUILT_IN (olddecl) = 0;
1890 /* If redeclaring a builtin function, and not a definition,
1891 it stays built in. */
1892 DECL_BUILT_IN (newdecl) = 1;
1893 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1896 /* Also preserve various other info from the definition. */
1897 else if (! new_is_definition)
1898 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1899 if (! new_is_definition)
1901 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1902 /* When called with different_binding_level set, don't copy over
1903 DECL_INITIAL, so that we don't accidentally change function
1904 declarations into function definitions. */
1905 if (! different_binding_level)
1906 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1907 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1908 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1911 if (different_binding_level)
1913 /* Don't output a duplicate symbol for this declaration. */
1914 TREE_ASM_WRITTEN (newdecl) = 1;
1918 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1919 But preserve OLDdECL's DECL_UID. */
1921 register unsigned olddecl_uid = DECL_UID (olddecl);
1923 bcopy ((char *) newdecl + sizeof (struct tree_common),
1924 (char *) olddecl + sizeof (struct tree_common),
1925 sizeof (struct tree_decl) - sizeof (struct tree_common));
1926 DECL_UID (olddecl) = olddecl_uid;
1932 /* Record a decl-node X as belonging to the current lexical scope.
1933 Check for errors (such as an incompatible declaration for the same
1934 name already seen in the same scope).
1936 Returns either X or an old decl for the same name.
1937 If an old decl is returned, it may have been smashed
1938 to agree with what X says. */
1945 register tree name = DECL_NAME (x);
1946 register struct binding_level *b = current_binding_level;
1948 DECL_CONTEXT (x) = current_function_decl;
1949 /* A local extern declaration for a function doesn't constitute nesting.
1950 A local auto declaration does, since it's a forward decl
1951 for a nested function coming later. */
1952 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1953 && DECL_EXTERNAL (x))
1954 DECL_CONTEXT (x) = 0;
1956 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1957 && x != IDENTIFIER_IMPLICIT_DECL (name)
1958 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1959 && !DECL_IN_SYSTEM_HEADER (x))
1960 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1966 int different_binding_level = 0;
1968 t = lookup_name_current_level (name);
1969 /* Don't type check externs here when -traditional. This is so that
1970 code with conflicting declarations inside blocks will get warnings
1971 not errors. X11 for instance depends on this. */
1972 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
1974 t = IDENTIFIER_GLOBAL_VALUE (name);
1975 /* Type decls at global scope don't conflict with externs declared
1976 inside lexical blocks. */
1977 if (t && TREE_CODE (t) == TYPE_DECL)
1979 different_binding_level = 1;
1981 if (t != 0 && t == error_mark_node)
1982 /* error_mark_node is 0 for a while during initialization! */
1985 error_with_decl (x, "`%s' used prior to declaration");
1990 file = DECL_SOURCE_FILE (t);
1991 line = DECL_SOURCE_LINE (t);
1994 /* If this decl is `static' and an implicit decl was seen previously,
1995 warn. But don't complain if -traditional,
1996 since traditional compilers don't complain. */
1997 if (! flag_traditional && TREE_PUBLIC (name)
1998 /* Don't test for DECL_EXTERNAL, because grokdeclarator
1999 sets this for all functions. */
2000 && ! TREE_PUBLIC (x)
2001 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2002 /* We used to warn also for explicit extern followed by static,
2003 but sometimes you need to do it that way. */
2004 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2006 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2007 IDENTIFIER_POINTER (name));
2008 pedwarn_with_file_and_line
2009 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2010 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2011 "previous declaration of `%s'",
2012 IDENTIFIER_POINTER (name));
2015 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2017 if (TREE_CODE (t) == PARM_DECL)
2019 /* Don't allow more than one "real" duplicate
2020 of a forward parm decl. */
2021 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2027 /* If we are processing a typedef statement, generate a whole new
2028 ..._TYPE node (which will be just an variant of the existing
2029 ..._TYPE node with identical properties) and then install the
2030 TYPE_DECL node generated to represent the typedef name as the
2031 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2033 The whole point here is to end up with a situation where each
2034 and every ..._TYPE node the compiler creates will be uniquely
2035 associated with AT MOST one node representing a typedef name.
2036 This way, even though the compiler substitutes corresponding
2037 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2038 early on, later parts of the compiler can always do the reverse
2039 translation and get back the corresponding typedef name. For
2042 typedef struct S MY_TYPE;
2045 Later parts of the compiler might only know that `object' was of
2046 type `struct S' if if were not for code just below. With this
2047 code however, later parts of the compiler see something like:
2049 struct S' == struct S
2050 typedef struct S' MY_TYPE;
2053 And they can then deduce (from the node for type struct S') that
2054 the original object declaration was:
2058 Being able to do this is important for proper support of protoize,
2059 and also for generating precise symbolic debugging information
2060 which takes full account of the programmer's (typedef) vocabulary.
2062 Obviously, we don't want to generate a duplicate ..._TYPE node if
2063 the TYPE_DECL node that we are now processing really represents a
2064 standard built-in type.
2066 Since all standard types are effectively declared at line zero
2067 in the source file, we can easily check to see if we are working
2068 on a standard type by checking the current value of lineno. */
2070 if (TREE_CODE (x) == TYPE_DECL)
2072 if (DECL_SOURCE_LINE (x) == 0)
2074 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2075 TYPE_NAME (TREE_TYPE (x)) = x;
2077 else if (TREE_TYPE (x) != error_mark_node)
2079 tree tt = TREE_TYPE (x);
2080 DECL_ORIGINAL_TYPE (x) = tt;
2081 tt = build_type_copy (tt);
2087 /* Multiple external decls of the same identifier ought to match.
2088 Check against both global declarations (when traditional) and out of
2089 scope (limbo) block level declarations.
2091 We get warnings about inline functions where they are defined.
2092 Avoid duplicate warnings where they are used. */
2093 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2097 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2098 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2099 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2100 decl = IDENTIFIER_GLOBAL_VALUE (name);
2101 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2102 /* Decls in limbo are always extern, so no need to check that. */
2103 decl = IDENTIFIER_LIMBO_VALUE (name);
2107 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2108 /* If old decl is built-in, we already warned if we should. */
2109 && !DECL_BUILT_IN (decl))
2111 pedwarn_with_decl (x,
2112 "type mismatch with previous external decl");
2113 pedwarn_with_decl (decl, "previous external decl of `%s'");
2117 /* If a function has had an implicit declaration, and then is defined,
2118 make sure they are compatible. */
2120 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2121 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2122 && TREE_CODE (x) == FUNCTION_DECL
2123 && ! comptypes (TREE_TYPE (x),
2124 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2126 warning_with_decl (x, "type mismatch with previous implicit declaration");
2127 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2128 "previous implicit declaration of `%s'");
2131 /* In PCC-compatibility mode, extern decls of vars with no current decl
2132 take effect at top level no matter where they are. */
2133 if (flag_traditional && DECL_EXTERNAL (x)
2134 && lookup_name (name) == 0)
2136 tree type = TREE_TYPE (x);
2138 /* But don't do this if the type contains temporary nodes. */
2141 if (type == error_mark_node)
2143 if (! TREE_PERMANENT (type))
2145 warning_with_decl (x, "type of external `%s' is not global");
2146 /* By exiting the loop early, we leave TYPE nonzero,
2147 and thus prevent globalization of the decl. */
2150 else if (TREE_CODE (type) == FUNCTION_TYPE
2151 && TYPE_ARG_TYPES (type) != 0)
2152 /* The types might not be truly local,
2153 but the list of arg types certainly is temporary.
2154 Since prototypes are nontraditional,
2155 ok not to do the traditional thing. */
2157 type = TREE_TYPE (type);
2161 b = global_binding_level;
2164 /* This name is new in its binding level.
2165 Install the new declaration and return it. */
2166 if (b == global_binding_level)
2168 /* Install a global value. */
2170 /* If the first global decl has external linkage,
2171 warn if we later see static one. */
2172 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2173 TREE_PUBLIC (name) = 1;
2175 IDENTIFIER_GLOBAL_VALUE (name) = x;
2177 /* We no longer care about any previous block level declarations. */
2178 IDENTIFIER_LIMBO_VALUE (name) = 0;
2180 /* Don't forget if the function was used via an implicit decl. */
2181 if (IDENTIFIER_IMPLICIT_DECL (name)
2182 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2183 TREE_USED (x) = 1, TREE_USED (name) = 1;
2185 /* Don't forget if its address was taken in that way. */
2186 if (IDENTIFIER_IMPLICIT_DECL (name)
2187 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2188 TREE_ADDRESSABLE (x) = 1;
2190 /* Warn about mismatches against previous implicit decl. */
2191 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2192 /* If this real decl matches the implicit, don't complain. */
2193 && ! (TREE_CODE (x) == FUNCTION_DECL
2194 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2195 == integer_type_node)))
2196 pedwarn ("`%s' was previously implicitly declared to return `int'",
2197 IDENTIFIER_POINTER (name));
2199 /* If this decl is `static' and an `extern' was seen previously,
2200 that is erroneous. */
2201 if (TREE_PUBLIC (name)
2202 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2204 /* Okay to redeclare an ANSI built-in as static. */
2205 if (t != 0 && DECL_BUILT_IN (t))
2207 /* Okay to declare a non-ANSI built-in as anything. */
2208 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2210 /* Okay to have global type decl after an earlier extern
2211 declaration inside a lexical block. */
2212 else if (TREE_CODE (x) == TYPE_DECL)
2214 else if (IDENTIFIER_IMPLICIT_DECL (name))
2215 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2216 IDENTIFIER_POINTER (name));
2218 pedwarn ("`%s' was declared `extern' and later `static'",
2219 IDENTIFIER_POINTER (name));
2224 /* Here to install a non-global value. */
2225 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2226 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2227 IDENTIFIER_LOCAL_VALUE (name) = x;
2229 /* If this is an extern function declaration, see if we
2230 have a global definition or declaration for the function. */
2232 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2234 && TREE_CODE (x) == FUNCTION_DECL
2235 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2237 /* We have one. Their types must agree. */
2238 if (! comptypes (TREE_TYPE (x),
2239 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2240 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2243 /* Inner extern decl is inline if global one is.
2244 Copy enough to really inline it. */
2245 if (DECL_INLINE (oldglobal))
2247 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2248 DECL_INITIAL (x) = (current_function_decl == oldglobal
2249 ? 0 : DECL_INITIAL (oldglobal));
2250 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2251 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2252 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2253 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2254 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2255 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2257 /* Inner extern decl is built-in if global one is. */
2258 if (DECL_BUILT_IN (oldglobal))
2260 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2261 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2263 /* Keep the arg types from a file-scope fcn defn. */
2264 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2265 && DECL_INITIAL (oldglobal)
2266 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2267 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2271 #if 0 /* This case is probably sometimes the right thing to do. */
2272 /* If we have a local external declaration,
2273 then any file-scope declaration should not
2274 have been static. */
2275 if (oldlocal == 0 && oldglobal != 0
2276 && !TREE_PUBLIC (oldglobal)
2277 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2278 warning ("`%s' locally external but globally static",
2279 IDENTIFIER_POINTER (name));
2282 /* If we have a local external declaration,
2283 and no file-scope declaration has yet been seen,
2284 then if we later have a file-scope decl it must not be static. */
2286 && DECL_EXTERNAL (x)
2290 TREE_PUBLIC (name) = 1;
2292 /* Save this decl, so that we can do type checking against
2293 other decls after it falls out of scope.
2295 Only save it once. This prevents temporary decls created in
2296 expand_inline_function from being used here, since this
2297 will have been set when the inline function was parsed.
2298 It also helps give slightly better warnings. */
2299 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2300 IDENTIFIER_LIMBO_VALUE (name) = x;
2303 /* Warn if shadowing an argument at the top level of the body. */
2304 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2305 /* This warning doesn't apply to the parms of a nested fcn. */
2306 && ! current_binding_level->parm_flag
2307 /* Check that this is one level down from the parms. */
2308 && current_binding_level->level_chain->parm_flag
2309 /* Check that the decl being shadowed
2310 comes from the parm level, one level up. */
2311 && chain_member (oldlocal, current_binding_level->level_chain->names))
2313 if (TREE_CODE (oldlocal) == PARM_DECL)
2314 pedwarn ("declaration of `%s' shadows a parameter",
2315 IDENTIFIER_POINTER (name));
2317 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2318 IDENTIFIER_POINTER (name));
2321 /* Maybe warn if shadowing something else. */
2322 else if (warn_shadow && !DECL_EXTERNAL (x)
2323 /* No shadow warnings for internally generated vars. */
2324 && DECL_SOURCE_LINE (x) != 0
2325 /* No shadow warnings for vars made for inlining. */
2326 && ! DECL_FROM_INLINE (x))
2328 char *warnstring = 0;
2330 if (TREE_CODE (x) == PARM_DECL
2331 && current_binding_level->level_chain->parm_flag)
2332 /* Don't warn about the parm names in function declarator
2333 within a function declarator.
2334 It would be nice to avoid warning in any function
2335 declarator in a declaration, as opposed to a definition,
2336 but there is no way to tell it's not a definition. */
2338 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2339 warnstring = "declaration of `%s' shadows a parameter";
2340 else if (oldlocal != 0)
2341 warnstring = "declaration of `%s' shadows previous local";
2342 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2343 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2344 warnstring = "declaration of `%s' shadows global declaration";
2347 warning (warnstring, IDENTIFIER_POINTER (name));
2350 /* If storing a local value, there may already be one (inherited).
2351 If so, record it for restoration when this binding level ends. */
2353 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2356 /* Keep count of variables in this level with incomplete type. */
2357 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2361 /* Put decls on list in reverse order.
2362 We will reverse them later if necessary. */
2363 TREE_CHAIN (x) = b->names;
2369 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2372 pushdecl_top_level (x)
2376 register struct binding_level *b = current_binding_level;
2378 current_binding_level = global_binding_level;
2380 current_binding_level = b;
2384 /* Generate an implicit declaration for identifier FUNCTIONID
2385 as a function of type int (). Print a warning if appropriate. */
2388 implicitly_declare (functionid)
2392 int traditional_warning = 0;
2393 /* Only one "implicit declaration" warning per identifier. */
2394 int implicit_warning;
2396 /* Save the decl permanently so we can warn if definition follows. */
2397 push_obstacks_nochange ();
2398 end_temporary_allocation ();
2400 /* We used to reuse an old implicit decl here,
2401 but this loses with inline functions because it can clobber
2402 the saved decl chains. */
2403 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2404 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2406 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2408 /* Warn of implicit decl following explicit local extern decl.
2409 This is probably a program designed for traditional C. */
2410 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2411 traditional_warning = 1;
2413 /* Warn once of an implicit declaration. */
2414 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2416 DECL_EXTERNAL (decl) = 1;
2417 TREE_PUBLIC (decl) = 1;
2418 DECL_ARTIFICIAL (decl);
2420 /* Record that we have an implicit decl and this is it. */
2421 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2423 /* ANSI standard says implicit declarations are in the innermost block.
2424 So we record the decl in the standard fashion.
2425 If flag_traditional is set, pushdecl does it top-level. */
2428 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2429 maybe_objc_check_decl (decl);
2431 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2433 if (warn_implicit && implicit_warning)
2434 warning ("implicit declaration of function `%s'",
2435 IDENTIFIER_POINTER (functionid));
2436 else if (warn_traditional && traditional_warning)
2437 warning ("function `%s' was previously declared within a block",
2438 IDENTIFIER_POINTER (functionid));
2440 /* Write a record describing this implicit function declaration to the
2441 prototypes file (if requested). */
2443 gen_aux_info_record (decl, 0, 1, 0);
2450 /* Return zero if the declaration NEWDECL is valid
2451 when the declaration OLDDECL (assumed to be for the same name)
2452 has already been seen.
2453 Otherwise return an error message format string with a %s
2454 where the identifier should go. */
2457 redeclaration_error_message (newdecl, olddecl)
2458 tree newdecl, olddecl;
2460 if (TREE_CODE (newdecl) == TYPE_DECL)
2462 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2464 /* pushdecl creates distinct types for TYPE_DECLs by calling
2465 build_type_copy, so the above comparison generally fails. We do
2466 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2467 is equivalent to what this code used to do before the build_type_copy
2468 call. The variant type distinction should not matter for traditional
2469 code, because it doesn't have type qualifiers. */
2470 if (flag_traditional
2471 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2473 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2475 return "redefinition of `%s'";
2477 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2479 /* Declarations of functions can insist on internal linkage
2480 but they can't be inconsistent with internal linkage,
2481 so there can be no error on that account.
2482 However defining the same name twice is no good. */
2483 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2484 /* However, defining once as extern inline and a second
2485 time in another way is ok. */
2486 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2487 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2488 return "redefinition of `%s'";
2491 else if (current_binding_level == global_binding_level)
2493 /* Objects declared at top level: */
2494 /* If at least one is a reference, it's ok. */
2495 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2497 /* Reject two definitions. */
2498 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2499 return "redefinition of `%s'";
2500 /* Now we have two tentative defs, or one tentative and one real def. */
2501 /* Insist that the linkage match. */
2502 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2503 return "conflicting declarations of `%s'";
2506 else if (current_binding_level->parm_flag
2507 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2511 /* Newdecl has block scope. If olddecl has block scope also, then
2512 reject two definitions, and reject a definition together with an
2513 external reference. Otherwise, it is OK, because newdecl must
2514 be an extern reference to olddecl. */
2515 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2516 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2517 return "redeclaration of `%s'";
2522 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2523 Create one if none exists so far for the current function.
2524 This function is called for both label definitions and label references. */
2530 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2532 if (current_function_decl == 0)
2534 error ("label %s referenced outside of any function",
2535 IDENTIFIER_POINTER (id));
2539 /* Use a label already defined or ref'd with this name. */
2542 /* But not if it is inherited and wasn't declared to be inheritable. */
2543 if (DECL_CONTEXT (decl) != current_function_decl
2544 && ! C_DECLARED_LABEL_FLAG (decl))
2545 return shadow_label (id);
2549 decl = build_decl (LABEL_DECL, id, void_type_node);
2551 /* Make sure every label has an rtx. */
2554 /* A label not explicitly declared must be local to where it's ref'd. */
2555 DECL_CONTEXT (decl) = current_function_decl;
2557 DECL_MODE (decl) = VOIDmode;
2559 /* Say where one reference is to the label,
2560 for the sake of the error if it is not defined. */
2561 DECL_SOURCE_LINE (decl) = lineno;
2562 DECL_SOURCE_FILE (decl) = input_filename;
2564 IDENTIFIER_LABEL_VALUE (id) = decl;
2566 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2571 /* Make a label named NAME in the current function,
2572 shadowing silently any that may be inherited from containing functions
2573 or containing scopes.
2575 Note that valid use, if the label being shadowed
2576 comes from another scope in the same function,
2577 requires calling declare_nonlocal_label right away. */
2583 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2589 /* Check to make sure that the label hasn't already been declared
2590 at this label scope */
2591 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2592 if (TREE_VALUE (dup) == decl)
2594 error ("duplicate label declaration `%s'",
2595 IDENTIFIER_POINTER (name));
2596 error_with_decl (TREE_VALUE (dup),
2597 "this is a previous declaration");
2598 /* Just use the previous declaration. */
2599 return lookup_label (name);
2602 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2603 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2606 return lookup_label (name);
2609 /* Define a label, specifying the location in the source file.
2610 Return the LABEL_DECL node for the label, if the definition is valid.
2611 Otherwise return 0. */
2614 define_label (filename, line, name)
2619 tree decl = lookup_label (name);
2621 /* If label with this name is known from an outer context, shadow it. */
2622 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2624 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2625 IDENTIFIER_LABEL_VALUE (name) = 0;
2626 decl = lookup_label (name);
2629 if (DECL_INITIAL (decl) != 0)
2631 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2636 /* Mark label as having been defined. */
2637 DECL_INITIAL (decl) = error_mark_node;
2638 /* Say where in the source. */
2639 DECL_SOURCE_FILE (decl) = filename;
2640 DECL_SOURCE_LINE (decl) = line;
2645 /* Return the list of declarations of the current level.
2646 Note that this list is in reverse order unless/until
2647 you nreverse it; and when you do nreverse it, you must
2648 store the result back using `storedecls' or you will lose. */
2653 return current_binding_level->names;
2656 /* Return the list of type-tags (for structs, etc) of the current level. */
2661 return current_binding_level->tags;
2664 /* Store the list of declarations of the current level.
2665 This is done for the parameter declarations of a function being defined,
2666 after they are modified in the light of any missing parameters. */
2672 current_binding_level->names = decls;
2675 /* Similarly, store the list of tags of the current level. */
2681 current_binding_level->tags = tags;
2684 /* Given NAME, an IDENTIFIER_NODE,
2685 return the structure (or union or enum) definition for that name.
2686 Searches binding levels from BINDING_LEVEL up to the global level.
2687 If THISLEVEL_ONLY is nonzero, searches only the specified context
2688 (but skips any tag-transparent contexts to find one that is
2689 meaningful for tags).
2690 CODE says which kind of type the caller wants;
2691 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2692 If the wrong kind of type is found, an error is reported. */
2695 lookup_tag (code, name, binding_level, thislevel_only)
2696 enum tree_code code;
2697 struct binding_level *binding_level;
2701 register struct binding_level *level;
2703 for (level = binding_level; level; level = level->level_chain)
2706 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2708 if (TREE_PURPOSE (tail) == name)
2710 if (TREE_CODE (TREE_VALUE (tail)) != code)
2712 /* Definition isn't the kind we were looking for. */
2713 pending_invalid_xref = name;
2714 pending_invalid_xref_file = input_filename;
2715 pending_invalid_xref_line = lineno;
2717 return TREE_VALUE (tail);
2720 if (thislevel_only && ! level->tag_transparent)
2726 /* Print an error message now
2727 for a recent invalid struct, union or enum cross reference.
2728 We don't print them immediately because they are not invalid
2729 when used in the `struct foo;' construct for shadowing. */
2732 pending_xref_error ()
2734 if (pending_invalid_xref != 0)
2735 error_with_file_and_line (pending_invalid_xref_file,
2736 pending_invalid_xref_line,
2737 "`%s' defined as wrong kind of tag",
2738 IDENTIFIER_POINTER (pending_invalid_xref));
2739 pending_invalid_xref = 0;
2742 /* Given a type, find the tag that was defined for it and return the tag name.
2743 Otherwise return 0. */
2746 lookup_tag_reverse (type)
2749 register struct binding_level *level;
2751 for (level = current_binding_level; level; level = level->level_chain)
2754 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2756 if (TREE_VALUE (tail) == type)
2757 return TREE_PURPOSE (tail);
2763 /* Look up NAME in the current binding level and its superiors
2764 in the namespace of variables, functions and typedefs.
2765 Return a ..._DECL node of some kind representing its definition,
2766 or return 0 if it is undefined. */
2773 if (current_binding_level != global_binding_level
2774 && IDENTIFIER_LOCAL_VALUE (name))
2775 val = IDENTIFIER_LOCAL_VALUE (name);
2777 val = IDENTIFIER_GLOBAL_VALUE (name);
2781 /* Similar to `lookup_name' but look only at current binding level. */
2784 lookup_name_current_level (name)
2789 if (current_binding_level == global_binding_level)
2790 return IDENTIFIER_GLOBAL_VALUE (name);
2792 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2795 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2796 if (DECL_NAME (t) == name)
2802 /* Create the predefined scalar types of C,
2803 and some nodes representing standard constants (0, 1, (void *) 0).
2804 Initialize the global binding level.
2805 Make definitions for built-in primitive functions. */
2808 init_decl_processing ()
2810 register tree endlink;
2811 /* Either char* or void*. */
2812 tree traditional_ptr_type_node;
2813 /* Data types of memcpy and strlen. */
2814 tree memcpy_ftype, memset_ftype, strlen_ftype;
2815 tree void_ftype_any;
2816 int wchar_type_size;
2818 tree array_domain_type;
2820 current_function_decl = NULL;
2821 named_labels = NULL;
2822 current_binding_level = NULL_BINDING_LEVEL;
2823 free_binding_level = NULL_BINDING_LEVEL;
2824 pushlevel (0); /* make the binding_level structure for global names */
2825 global_binding_level = current_binding_level;
2827 /* Define `int' and `char' first so that dbx will output them first. */
2829 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2830 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2831 integer_type_node));
2833 /* Define `char', which is like either `signed char' or `unsigned char'
2834 but not the same as either. */
2838 ? make_signed_type (CHAR_TYPE_SIZE)
2839 : make_unsigned_type (CHAR_TYPE_SIZE));
2840 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2843 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2844 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2845 long_integer_type_node));
2847 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2848 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2849 unsigned_type_node));
2851 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2852 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2853 long_unsigned_type_node));
2855 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2856 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2857 long_long_integer_type_node));
2859 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2860 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2861 long_long_unsigned_type_node));
2863 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2864 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2865 short_integer_type_node));
2867 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2868 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2869 short_unsigned_type_node));
2871 /* `unsigned long' is the standard type for sizeof.
2872 Traditionally, use a signed type.
2873 Note that stddef.h uses `unsigned long',
2874 and this must agree, even of long and int are the same size. */
2876 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2877 if (flag_traditional && TREE_UNSIGNED (sizetype))
2878 sizetype = signed_type (sizetype);
2881 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2883 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2884 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2885 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2886 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2887 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2888 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2889 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2890 TREE_TYPE (TYPE_SIZE (short_integer_type_node)) = sizetype;
2891 TREE_TYPE (TYPE_SIZE (short_unsigned_type_node)) = sizetype;
2893 error_mark_node = make_node (ERROR_MARK);
2894 TREE_TYPE (error_mark_node) = error_mark_node;
2896 /* Define both `signed char' and `unsigned char'. */
2897 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2898 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2899 signed_char_type_node));
2901 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2902 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2903 unsigned_char_type_node));
2905 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2906 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2908 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2909 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2911 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2912 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2914 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2915 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2917 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2918 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2920 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2921 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2923 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2924 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2926 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2927 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2929 float_type_node = make_node (REAL_TYPE);
2930 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2931 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2933 layout_type (float_type_node);
2935 double_type_node = make_node (REAL_TYPE);
2936 if (flag_short_double)
2937 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2939 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2940 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2942 layout_type (double_type_node);
2944 long_double_type_node = make_node (REAL_TYPE);
2945 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2946 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2947 long_double_type_node));
2948 layout_type (long_double_type_node);
2950 complex_integer_type_node = make_node (COMPLEX_TYPE);
2951 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2952 complex_integer_type_node));
2953 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2954 layout_type (complex_integer_type_node);
2956 complex_float_type_node = make_node (COMPLEX_TYPE);
2957 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2958 complex_float_type_node));
2959 TREE_TYPE (complex_float_type_node) = float_type_node;
2960 layout_type (complex_float_type_node);
2962 complex_double_type_node = make_node (COMPLEX_TYPE);
2963 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2964 complex_double_type_node));
2965 TREE_TYPE (complex_double_type_node) = double_type_node;
2966 layout_type (complex_double_type_node);
2968 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2969 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2970 complex_long_double_type_node));
2971 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2972 layout_type (complex_long_double_type_node);
2975 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2976 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2977 signed_wchar_type_node = signed_type (wchar_type_node);
2978 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2980 integer_zero_node = build_int_2 (0, 0);
2981 TREE_TYPE (integer_zero_node) = integer_type_node;
2982 integer_one_node = build_int_2 (1, 0);
2983 TREE_TYPE (integer_one_node) = integer_type_node;
2985 boolean_type_node = integer_type_node;
2986 boolean_true_node = integer_one_node;
2987 boolean_false_node = integer_zero_node;
2989 size_zero_node = build_int_2 (0, 0);
2990 TREE_TYPE (size_zero_node) = sizetype;
2991 size_one_node = build_int_2 (1, 0);
2992 TREE_TYPE (size_one_node) = sizetype;
2994 void_type_node = make_node (VOID_TYPE);
2995 pushdecl (build_decl (TYPE_DECL,
2996 ridpointers[(int) RID_VOID], void_type_node));
2997 layout_type (void_type_node); /* Uses integer_zero_node */
2998 /* We are not going to have real types in C with less than byte alignment,
2999 so we might as well not have any types that claim to have it. */
3000 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3002 null_pointer_node = build_int_2 (0, 0);
3003 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3004 layout_type (TREE_TYPE (null_pointer_node));
3006 string_type_node = build_pointer_type (char_type_node);
3007 const_string_type_node
3008 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3010 /* Make a type to be the domain of a few array types
3011 whose domains don't really matter.
3012 200 is small enough that it always fits in size_t
3013 and large enough that it can hold most function names for the
3014 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3015 array_domain_type = build_index_type (build_int_2 (200, 0));
3017 /* make a type for arrays of characters.
3018 With luck nothing will ever really depend on the length of this
3020 char_array_type_node
3021 = build_array_type (char_type_node, array_domain_type);
3022 /* Likewise for arrays of ints. */
3024 = build_array_type (integer_type_node, array_domain_type);
3025 /* This is for wide string constants. */
3026 wchar_array_type_node
3027 = build_array_type (wchar_type_node, array_domain_type);
3029 default_function_type
3030 = build_function_type (integer_type_node, NULL_TREE);
3032 ptr_type_node = build_pointer_type (void_type_node);
3034 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3036 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3039 = build_function_type (void_type_node, NULL_TREE);
3042 = build_function_type (float_type_node,
3043 tree_cons (NULL_TREE, float_type_node, endlink));
3046 = build_function_type (double_type_node,
3047 tree_cons (NULL_TREE, double_type_node, endlink));
3049 ldouble_ftype_ldouble
3050 = build_function_type (long_double_type_node,
3051 tree_cons (NULL_TREE, long_double_type_node,
3054 double_ftype_double_double
3055 = build_function_type (double_type_node,
3056 tree_cons (NULL_TREE, double_type_node,
3057 tree_cons (NULL_TREE,
3058 double_type_node, endlink)));
3061 = build_function_type (integer_type_node,
3062 tree_cons (NULL_TREE, integer_type_node, endlink));
3065 = build_function_type (long_integer_type_node,
3066 tree_cons (NULL_TREE,
3067 long_integer_type_node, endlink));
3069 void_ftype_ptr_ptr_int
3070 = build_function_type (void_type_node,
3071 tree_cons (NULL_TREE, ptr_type_node,
3072 tree_cons (NULL_TREE, ptr_type_node,
3073 tree_cons (NULL_TREE,
3077 int_ftype_cptr_cptr_sizet
3078 = build_function_type (integer_type_node,
3079 tree_cons (NULL_TREE, const_ptr_type_node,
3080 tree_cons (NULL_TREE, const_ptr_type_node,
3081 tree_cons (NULL_TREE,
3085 void_ftype_ptr_int_int
3086 = build_function_type (void_type_node,
3087 tree_cons (NULL_TREE, ptr_type_node,
3088 tree_cons (NULL_TREE, integer_type_node,
3089 tree_cons (NULL_TREE,
3093 string_ftype_ptr_ptr /* strcpy prototype */
3094 = build_function_type (string_type_node,
3095 tree_cons (NULL_TREE, string_type_node,
3096 tree_cons (NULL_TREE,
3097 const_string_type_node,
3100 int_ftype_string_string /* strcmp prototype */
3101 = build_function_type (integer_type_node,
3102 tree_cons (NULL_TREE, const_string_type_node,
3103 tree_cons (NULL_TREE,
3104 const_string_type_node,
3107 strlen_ftype /* strlen prototype */
3108 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3109 tree_cons (NULL_TREE, const_string_type_node,
3112 traditional_ptr_type_node
3113 = (flag_traditional ? string_type_node : ptr_type_node);
3115 memcpy_ftype /* memcpy prototype */
3116 = build_function_type (traditional_ptr_type_node,
3117 tree_cons (NULL_TREE, ptr_type_node,
3118 tree_cons (NULL_TREE, const_ptr_type_node,
3119 tree_cons (NULL_TREE,
3123 memset_ftype /* memset prototype */
3124 = build_function_type (traditional_ptr_type_node,
3125 tree_cons (NULL_TREE, ptr_type_node,
3126 tree_cons (NULL_TREE, integer_type_node,
3127 tree_cons (NULL_TREE,
3131 builtin_function ("__builtin_constant_p", default_function_type,
3132 BUILT_IN_CONSTANT_P, NULL_PTR);
3134 builtin_function ("__builtin_return_address",
3135 build_function_type (ptr_type_node,
3136 tree_cons (NULL_TREE,
3139 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3141 builtin_function ("__builtin_frame_address",
3142 build_function_type (ptr_type_node,
3143 tree_cons (NULL_TREE,
3146 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3148 builtin_function ("__builtin_alloca",
3149 build_function_type (ptr_type_node,
3150 tree_cons (NULL_TREE,
3153 BUILT_IN_ALLOCA, "alloca");
3154 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3155 /* Define alloca, ffs as builtins.
3156 Declare _exit just to mark it as volatile. */
3157 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3159 temp = builtin_function ("alloca",
3160 build_function_type (ptr_type_node,
3161 tree_cons (NULL_TREE,
3164 BUILT_IN_ALLOCA, NULL_PTR);
3165 /* Suppress error if redefined as a non-function. */
3166 DECL_BUILT_IN_NONANSI (temp) = 1;
3167 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3168 /* Suppress error if redefined as a non-function. */
3169 DECL_BUILT_IN_NONANSI (temp) = 1;
3170 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3172 TREE_THIS_VOLATILE (temp) = 1;
3173 TREE_SIDE_EFFECTS (temp) = 1;
3174 /* Suppress error if redefined as a non-function. */
3175 DECL_BUILT_IN_NONANSI (temp) = 1;
3178 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3179 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3181 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3183 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3185 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3187 builtin_function ("__builtin_saveregs",
3188 build_function_type (ptr_type_node, NULL_TREE),
3189 BUILT_IN_SAVEREGS, NULL_PTR);
3190 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3192 builtin_function ("__builtin_varargs",
3193 build_function_type (ptr_type_node,
3194 tree_cons (NULL_TREE,
3197 BUILT_IN_VARARGS, NULL_PTR);
3199 builtin_function ("__builtin_classify_type", default_function_type,
3200 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3201 builtin_function ("__builtin_next_arg",
3202 build_function_type (ptr_type_node, NULL_TREE),
3203 BUILT_IN_NEXT_ARG, NULL_PTR);
3204 builtin_function ("__builtin_args_info",
3205 build_function_type (integer_type_node,
3206 tree_cons (NULL_TREE,
3209 BUILT_IN_ARGS_INFO, NULL_PTR);
3211 /* Untyped call and return. */
3212 builtin_function ("__builtin_apply_args",
3213 build_function_type (ptr_type_node, NULL_TREE),
3214 BUILT_IN_APPLY_ARGS, NULL_PTR);
3216 temp = tree_cons (NULL_TREE,
3217 build_pointer_type (build_function_type (void_type_node,
3219 tree_cons (NULL_TREE,
3221 tree_cons (NULL_TREE,
3224 builtin_function ("__builtin_apply",
3225 build_function_type (ptr_type_node, temp),
3226 BUILT_IN_APPLY, NULL_PTR);
3227 builtin_function ("__builtin_return",
3228 build_function_type (void_type_node,
3229 tree_cons (NULL_TREE,
3232 BUILT_IN_RETURN, NULL_PTR);
3234 /* Currently under experimentation. */
3235 builtin_function ("__builtin_memcpy", memcpy_ftype,
3236 BUILT_IN_MEMCPY, "memcpy");
3237 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3238 BUILT_IN_MEMCMP, "memcmp");
3239 builtin_function ("__builtin_memset", memset_ftype,
3240 BUILT_IN_MEMSET, NULL_PTR);
3241 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3242 BUILT_IN_STRCMP, "strcmp");
3243 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3244 BUILT_IN_STRCPY, "strcpy");
3245 builtin_function ("__builtin_strlen", strlen_ftype,
3246 BUILT_IN_STRLEN, "strlen");
3247 builtin_function ("__builtin_sqrtf", float_ftype_float,
3248 BUILT_IN_FSQRT, "sqrtf");
3249 builtin_function ("__builtin_fsqrt", double_ftype_double,
3250 BUILT_IN_FSQRT, "sqrt");
3251 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3252 BUILT_IN_FSQRT, "sqrtl");
3253 builtin_function ("__builtin_sinf", float_ftype_float,
3254 BUILT_IN_SIN, "sinf");
3255 builtin_function ("__builtin_sin", double_ftype_double,
3256 BUILT_IN_SIN, "sin");
3257 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3258 BUILT_IN_SIN, "sinl");
3259 builtin_function ("__builtin_cosf", float_ftype_float,
3260 BUILT_IN_COS, "cosf");
3261 builtin_function ("__builtin_cos", double_ftype_double,
3262 BUILT_IN_COS, "cos");
3263 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3264 BUILT_IN_COS, "cosl");
3265 builtin_function ("__builtin_setjmp",
3266 build_function_type (integer_type_node,
3267 tree_cons (NULL_TREE,
3268 ptr_type_node, endlink)),
3269 BUILT_IN_SETJMP, NULL_PTR);
3270 builtin_function ("__builtin_longjmp",
3273 tree_cons (NULL, ptr_type_node,
3274 tree_cons (NULL_TREE,
3277 BUILT_IN_LONGJMP, NULL_PTR);
3279 /* In an ANSI C program, it is okay to supply built-in meanings
3280 for these functions, since applications cannot validly use them
3281 with any other meaning.
3282 However, honor the -fno-builtin option. */
3283 if (!flag_no_builtin)
3285 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3286 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3287 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3288 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3290 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3291 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3292 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3294 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3295 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3297 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3299 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3300 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3301 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3302 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3304 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3305 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3306 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3307 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3308 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3309 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3311 /* Declare these functions volatile
3312 to avoid spurious "control drops through" warnings. */
3313 /* Don't specify the argument types, to avoid errors
3314 from certain code which isn't valid in ANSI but which exists. */
3315 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3317 TREE_THIS_VOLATILE (temp) = 1;
3318 TREE_SIDE_EFFECTS (temp) = 1;
3319 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3320 TREE_THIS_VOLATILE (temp) = 1;
3321 TREE_SIDE_EFFECTS (temp) = 1;
3325 /* Support for these has not been written in either expand_builtin
3326 or build_function_call. */
3327 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3328 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3329 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3331 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3333 builtin_function ("__builtin_fmod", double_ftype_double_double,
3334 BUILT_IN_FMOD, NULL_PTR);
3335 builtin_function ("__builtin_frem", double_ftype_double_double,
3336 BUILT_IN_FREM, NULL_PTR);
3337 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3338 BUILT_IN_MEMSET, NULL_PTR);
3339 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3341 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3345 pedantic_lvalues = pedantic;
3347 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3348 declare_function_name ();
3350 start_identifier_warnings ();
3352 /* Prepare to check format strings against argument lists. */
3353 init_function_format_info ();
3357 incomplete_decl_finalize_hook = finish_incomplete_decl;
3360 /* Return a definition for a builtin function named NAME and whose data type
3361 is TYPE. TYPE should be a function type with argument types.
3362 FUNCTION_CODE tells later passes how to compile calls to this function.
3363 See tree.h for its possible values.
3365 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3366 the name to be called if we can't opencode the function. */
3369 builtin_function (name, type, function_code, library_name)
3372 enum built_in_function function_code;
3375 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3376 DECL_EXTERNAL (decl) = 1;
3377 TREE_PUBLIC (decl) = 1;
3378 /* If -traditional, permit redefining a builtin function any way you like.
3379 (Though really, if the program redefines these functions,
3380 it probably won't work right unless compiled with -fno-builtin.) */
3381 if (flag_traditional && name[0] != '_')
3382 DECL_BUILT_IN_NONANSI (decl) = 1;
3384 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3385 make_decl_rtl (decl, NULL_PTR, 1);
3387 if (function_code != NOT_BUILT_IN)
3389 DECL_BUILT_IN (decl) = 1;
3390 DECL_FUNCTION_CODE (decl) = function_code;
3392 /* Warn if a function in the namespace for users
3393 is used without an occasion to consider it declared. */
3394 if (name[0] != '_' || name[1] != '_')
3395 C_DECL_ANTICIPATED (decl) = 1;
3400 /* Called when a declaration is seen that contains no names to declare.
3401 If its type is a reference to a structure, union or enum inherited
3402 from a containing scope, shadow that tag name for the current scope
3403 with a forward reference.
3404 If its type defines a new named structure or union
3405 or defines an enum, it is valid but we need not do anything here.
3406 Otherwise, it is an error. */
3409 shadow_tag (declspecs)
3412 shadow_tag_warned (declspecs, 0);
3416 shadow_tag_warned (declspecs, warned)
3419 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3425 pending_invalid_xref = 0;
3427 for (link = declspecs; link; link = TREE_CHAIN (link))
3429 register tree value = TREE_VALUE (link);
3430 register enum tree_code code = TREE_CODE (value);
3432 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3433 /* Used to test also that TYPE_SIZE (value) != 0.
3434 That caused warning for `struct foo;' at top level in the file. */
3436 register tree name = lookup_tag_reverse (value);
3443 if (warned != 1 && code != ENUMERAL_TYPE)
3444 /* Empty unnamed enum OK */
3446 pedwarn ("unnamed struct/union that defines no instances");
3452 t = lookup_tag (code, name, current_binding_level, 1);
3456 t = make_node (code);
3463 if (!warned && ! in_system_header)
3465 warning ("useless keyword or type name in empty declaration");
3472 error ("two types specified in one empty declaration");
3477 pedwarn ("empty declaration");
3481 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3484 groktypename (typename)
3487 if (TREE_CODE (typename) != TREE_LIST)
3489 return grokdeclarator (TREE_VALUE (typename),
3490 TREE_PURPOSE (typename),
3494 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3497 groktypename_in_parm_context (typename)
3500 if (TREE_CODE (typename) != TREE_LIST)
3502 return grokdeclarator (TREE_VALUE (typename),
3503 TREE_PURPOSE (typename),
3507 /* Decode a declarator in an ordinary declaration or data definition.
3508 This is called as soon as the type information and variable name
3509 have been parsed, before parsing the initializer if any.
3510 Here we create the ..._DECL node, fill in its type,
3511 and put it on the list of decls for the current context.
3512 The ..._DECL node is returned as the value.
3514 Exception: for arrays where the length is not specified,
3515 the type is left null, to be filled in by `finish_decl'.
3517 Function definitions do not come here; they go to start_function
3518 instead. However, external and forward declarations of functions
3519 do go through here. Structure field declarations are done by
3520 grokfield and not through here. */
3522 /* Set this to zero to debug not using the temporary obstack
3523 to parse initializers. */
3524 int debug_temp_inits = 1;
3527 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3528 tree declarator, declspecs;
3530 tree attributes, prefix_attributes;
3532 register tree decl = grokdeclarator (declarator, declspecs,
3533 NORMAL, initialized);
3535 int init_written = initialized;
3537 /* The corresponding pop_obstacks is in finish_decl. */
3538 push_obstacks_nochange ();
3541 /* Is it valid for this decl to have an initializer at all?
3542 If not, set INITIALIZED to zero, which will indirectly
3543 tell `finish_decl' to ignore the initializer once it is parsed. */
3544 switch (TREE_CODE (decl))
3547 /* typedef foo = bar means give foo the same type as bar.
3548 We haven't parsed bar yet, so `finish_decl' will fix that up.
3549 Any other case of an initialization in a TYPE_DECL is an error. */
3550 if (pedantic || list_length (declspecs) > 1)
3552 error ("typedef `%s' is initialized",
3553 IDENTIFIER_POINTER (DECL_NAME (decl)));
3559 error ("function `%s' is initialized like a variable",
3560 IDENTIFIER_POINTER (DECL_NAME (decl)));
3565 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3566 error ("parameter `%s' is initialized",
3567 IDENTIFIER_POINTER (DECL_NAME (decl)));
3572 /* Don't allow initializations for incomplete types
3573 except for arrays which might be completed by the initialization. */
3574 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3576 /* A complete type is ok if size is fixed. */
3578 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3579 || C_DECL_VARIABLE_SIZE (decl))
3581 error ("variable-sized object may not be initialized");
3585 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3587 error ("variable `%s' has initializer but incomplete type",
3588 IDENTIFIER_POINTER (DECL_NAME (decl)));
3591 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3593 error ("elements of array `%s' have incomplete type",
3594 IDENTIFIER_POINTER (DECL_NAME (decl)));
3601 #if 0 /* Seems redundant with grokdeclarator. */
3602 if (current_binding_level != global_binding_level
3603 && DECL_EXTERNAL (decl)
3604 && TREE_CODE (decl) != FUNCTION_DECL)
3605 warning ("declaration of `%s' has `extern' and is initialized",
3606 IDENTIFIER_POINTER (DECL_NAME (decl)));
3608 DECL_EXTERNAL (decl) = 0;
3609 if (current_binding_level == global_binding_level)
3610 TREE_STATIC (decl) = 1;
3612 /* Tell `pushdecl' this is an initialized decl
3613 even though we don't yet have the initializer expression.
3614 Also tell `finish_decl' it may store the real initializer. */
3615 DECL_INITIAL (decl) = error_mark_node;
3618 /* If this is a function declaration, write a record describing it to the
3619 prototypes file (if requested). */
3621 if (TREE_CODE (decl) == FUNCTION_DECL)
3622 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3624 /* ANSI specifies that a tentative definition which is not merged with
3625 a non-tentative definition behaves exactly like a definition with an
3626 initializer equal to zero. (Section 3.7.2)
3627 -fno-common gives strict ANSI behavior. Usually you don't want it.
3628 This matters only for variables with external linkage. */
3629 if (! flag_no_common || ! TREE_PUBLIC (decl))
3630 DECL_COMMON (decl) = 1;
3632 /* Set attributes here so if duplicate decl, will have proper attributes. */
3633 decl_attributes (decl, attributes, prefix_attributes);
3635 /* Add this decl to the current binding level.
3636 TEM may equal DECL or it may be a previous decl of the same name. */
3637 tem = pushdecl (decl);
3639 /* For a local variable, define the RTL now. */
3640 if (current_binding_level != global_binding_level
3641 /* But not if this is a duplicate decl
3642 and we preserved the rtl from the previous one
3643 (which may or may not happen). */
3644 && DECL_RTL (tem) == 0)
3646 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3648 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3649 && DECL_INITIAL (tem) != 0)
3655 /* When parsing and digesting the initializer,
3656 use temporary storage. Do this even if we will ignore the value. */
3657 if (current_binding_level == global_binding_level && debug_temp_inits)
3658 temporary_allocation ();
3664 /* Finish processing of a declaration;
3665 install its initial value.
3666 If the length of an array type is not known before,
3667 it must be determined now, from the initial value, or it is an error. */
3670 finish_decl (decl, init, asmspec_tree)
3674 register tree type = TREE_TYPE (decl);
3675 int was_incomplete = (DECL_SIZE (decl) == 0);
3676 int temporary = allocation_temporary_p ();
3679 /* If a name was specified, get the string. */
3681 asmspec = TREE_STRING_POINTER (asmspec_tree);
3683 /* If `start_decl' didn't like having an initialization, ignore it now. */
3685 if (init != 0 && DECL_INITIAL (decl) == 0)
3687 /* Don't crash if parm is initialized. */
3688 if (TREE_CODE (decl) == PARM_DECL)
3691 if (ITERATOR_P (decl))
3694 error_with_decl (decl, "iterator has no initial value");
3696 init = save_expr (init);
3701 if (TREE_CODE (decl) != TYPE_DECL)
3702 store_init_value (decl, init);
3705 /* typedef foo = bar; store the type of bar as the type of foo. */
3706 TREE_TYPE (decl) = TREE_TYPE (init);
3707 DECL_INITIAL (decl) = init = 0;
3711 /* Pop back to the obstack that is current for this binding level.
3712 This is because MAXINDEX, rtl, etc. to be made below
3713 must go in the permanent obstack. But don't discard the
3714 temporary data yet. */
3716 #if 0 /* pop_obstacks was near the end; this is what was here. */
3717 if (current_binding_level == global_binding_level && temporary)
3718 end_temporary_allocation ();
3721 /* Deduce size of array from initialization, if not already known */
3723 if (TREE_CODE (type) == ARRAY_TYPE
3724 && TYPE_DOMAIN (type) == 0
3725 && TREE_CODE (decl) != TYPE_DECL)
3728 = (TREE_STATIC (decl)
3729 /* Even if pedantic, an external linkage array
3730 may have incomplete type at first. */
3731 ? pedantic && !TREE_PUBLIC (decl)
3732 : !DECL_EXTERNAL (decl));
3734 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3736 /* Get the completed type made by complete_array_type. */
3737 type = TREE_TYPE (decl);
3740 error_with_decl (decl, "initializer fails to determine size of `%s'");
3745 error_with_decl (decl, "array size missing in `%s'");
3746 /* If a `static' var's size isn't known,
3747 make it extern as well as static, so it does not get
3749 If it is not `static', then do not mark extern;
3750 finish_incomplete_decl will give it a default size
3751 and it will get allocated. */
3752 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3753 DECL_EXTERNAL (decl) = 1;
3756 /* TYPE_MAX_VALUE is always one less than the number of elements
3757 in the array, because we start counting at zero. Therefore,
3758 warn only if the value is less than zero. */
3759 if (pedantic && TYPE_DOMAIN (type) != 0
3760 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3761 error_with_decl (decl, "zero or negative size array `%s'");
3763 layout_decl (decl, 0);
3766 if (TREE_CODE (decl) == VAR_DECL)
3768 if (DECL_SIZE (decl) == 0
3769 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3770 layout_decl (decl, 0);
3772 if (DECL_SIZE (decl) == 0
3773 && (TREE_STATIC (decl)
3775 /* A static variable with an incomplete type
3776 is an error if it is initialized.
3777 Also if it is not file scope.
3778 Otherwise, let it through, but if it is not `extern'
3779 then it may cause an error message later. */
3780 /* A duplicate_decls call could have changed an extern
3781 declaration into a file scope one. This can be detected
3782 by TREE_ASM_WRITTEN being set. */
3783 (DECL_INITIAL (decl) != 0
3784 || DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl))
3786 /* An automatic variable with an incomplete type
3788 !DECL_EXTERNAL (decl)))
3790 error_with_decl (decl, "storage size of `%s' isn't known");
3791 TREE_TYPE (decl) = error_mark_node;
3794 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3795 && DECL_SIZE (decl) != 0)
3797 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3798 constant_expression_warning (DECL_SIZE (decl));
3800 error_with_decl (decl, "storage size of `%s' isn't constant");
3804 /* If this is a function and an assembler name is specified, it isn't
3805 builtin any more. Also reset DECL_RTL so we can give it its new
3807 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3809 DECL_BUILT_IN (decl) = 0;
3810 DECL_RTL (decl) = 0;
3813 /* Output the assembler code and/or RTL code for variables and functions,
3814 unless the type is an undefined structure or union.
3815 If not, it will get done when the type is completed. */
3817 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3819 if ((flag_traditional || TREE_PERMANENT (decl))
3820 && allocation_temporary_p ())
3822 push_obstacks_nochange ();
3823 end_temporary_allocation ();
3824 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3825 maybe_objc_check_decl (decl);
3826 rest_of_decl_compilation (decl, asmspec,
3827 (DECL_CONTEXT (decl) == 0
3828 || TREE_ASM_WRITTEN (decl)),
3834 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3835 maybe_objc_check_decl (decl);
3836 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3839 if (DECL_CONTEXT (decl) != 0)
3841 /* Recompute the RTL of a local array now
3842 if it used to be an incomplete type. */
3844 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3846 /* If we used it already as memory, it must stay in memory. */
3847 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3848 /* If it's still incomplete now, no init will save it. */
3849 if (DECL_SIZE (decl) == 0)
3850 DECL_INITIAL (decl) = 0;
3853 /* Compute and store the initial value. */
3854 if (TREE_CODE (decl) != FUNCTION_DECL)
3855 expand_decl_init (decl);
3859 if (TREE_CODE (decl) == TYPE_DECL)
3861 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3862 maybe_objc_check_decl (decl);
3863 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3867 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3868 /* This test used to include TREE_PERMANENT, however, we have the same
3869 problem with initializers at the function level. Such initializers get
3870 saved until the end of the function on the momentary_obstack. */
3871 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3873 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3874 space with DECL_ARG_TYPE. */
3875 && TREE_CODE (decl) != PARM_DECL)
3877 /* We need to remember that this array HAD an initialization,
3878 but discard the actual temporary nodes,
3879 since we can't have a permanent node keep pointing to them. */
3880 /* We make an exception for inline functions, since it's
3881 normal for a local extern redeclaration of an inline function
3882 to have a copy of the top-level decl's DECL_INLINE. */
3883 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3885 /* If this is a const variable, then preserve the
3886 initializer instead of discarding it so that we can optimize
3887 references to it. */
3888 /* This test used to include TREE_STATIC, but this won't be set
3889 for function level initializers. */
3890 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3892 preserve_initializer ();
3893 /* Hack? Set the permanent bit for something that is permanent,
3894 but not on the permanent obstack, so as to convince
3895 output_constant_def to make its rtl on the permanent
3897 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3899 /* The initializer and DECL must have the same (or equivalent
3900 types), but if the initializer is a STRING_CST, its type
3901 might not be on the right obstack, so copy the type
3903 TREE_TYPE (DECL_INITIAL (decl)) = type;
3906 DECL_INITIAL (decl) = error_mark_node;
3910 /* If requested, warn about definitions of large data objects. */
3912 if (warn_larger_than
3913 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3914 && !DECL_EXTERNAL (decl))
3916 register tree decl_size = DECL_SIZE (decl);
3918 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3920 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3922 if (units > larger_than_size)
3923 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3928 /* Resume permanent allocation, if not within a function. */
3929 /* The corresponding push_obstacks_nochange is in start_decl,
3930 and in push_parm_decl and in grokfield. */
3934 /* If we have gone back from temporary to permanent allocation,
3935 actually free the temporary space that we no longer need. */
3936 if (temporary && !allocation_temporary_p ())
3937 permanent_allocation (0);
3939 /* At the end of a declaration, throw away any variable type sizes
3940 of types defined inside that declaration. There is no use
3941 computing them in the following function definition. */
3942 if (current_binding_level == global_binding_level)
3943 get_pending_sizes ();
3946 /* If DECL has a cleanup, build and return that cleanup here.
3947 This is a callback called by expand_expr. */
3950 maybe_build_cleanup (decl)
3953 /* There are no cleanups in C. */
3957 /* Given a parsed parameter declaration,
3958 decode it into a PARM_DECL and push that on the current binding level.
3959 Also, for the sake of forward parm decls,
3960 record the given order of parms in `parm_order'. */
3963 push_parm_decl (parm)
3967 int old_immediate_size_expand = immediate_size_expand;
3968 /* Don't try computing parm sizes now -- wait till fn is called. */
3969 immediate_size_expand = 0;
3971 /* The corresponding pop_obstacks is in finish_decl. */
3972 push_obstacks_nochange ();
3974 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3975 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3976 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3977 TREE_PURPOSE (TREE_VALUE (parm)));
3980 if (DECL_NAME (decl))
3983 olddecl = lookup_name (DECL_NAME (decl));
3984 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3985 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3989 decl = pushdecl (decl);
3991 immediate_size_expand = old_immediate_size_expand;
3993 current_binding_level->parm_order
3994 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3996 /* Add this decl to the current binding level. */
3997 finish_decl (decl, NULL_TREE, NULL_TREE);
4000 /* Clear the given order of parms in `parm_order'.
4001 Used at start of parm list,
4002 and also at semicolon terminating forward decls. */
4007 current_binding_level->parm_order = NULL_TREE;
4010 /* Make TYPE a complete type based on INITIAL_VALUE.
4011 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4012 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4015 complete_array_type (type, initial_value, do_default)
4020 register tree maxindex = NULL_TREE;
4025 /* Note MAXINDEX is really the maximum index,
4026 one less than the size. */
4027 if (TREE_CODE (initial_value) == STRING_CST)
4030 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4031 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4034 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4036 tree elts = CONSTRUCTOR_ELTS (initial_value);
4037 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4038 for (; elts; elts = TREE_CHAIN (elts))
4040 if (TREE_PURPOSE (elts))
4041 maxindex = TREE_PURPOSE (elts);
4043 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4045 maxindex = copy_node (maxindex);
4049 /* Make an error message unless that happened already. */
4050 if (initial_value != error_mark_node)
4053 /* Prevent further error messages. */
4054 maxindex = build_int_2 (0, 0);
4061 maxindex = build_int_2 (0, 0);
4067 TYPE_DOMAIN (type) = build_index_type (maxindex);
4068 if (!TREE_TYPE (maxindex))
4069 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4070 #if 0 /* I took out this change
4071 together with the change in build_array_type. --rms */
4072 change_main_variant (type,
4073 build_array_type (TREE_TYPE (type),
4074 TYPE_DOMAIN (type)));
4078 /* Lay out the type now that we can get the real answer. */
4085 /* Given declspecs and a declarator,
4086 determine the name and type of the object declared
4087 and construct a ..._DECL node for it.
4088 (In one case we can return a ..._TYPE node instead.
4089 For invalid input we sometimes return 0.)
4091 DECLSPECS is a chain of tree_list nodes whose value fields
4092 are the storage classes and type specifiers.
4094 DECL_CONTEXT says which syntactic context this declaration is in:
4095 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4096 FUNCDEF for a function definition. Like NORMAL but a few different
4097 error messages in each case. Return value may be zero meaning
4098 this definition is too screwy to try to parse.
4099 PARM for a parameter declaration (either within a function prototype
4100 or before a function body). Make a PARM_DECL, or return void_type_node.
4101 TYPENAME if for a typename (in a cast or sizeof).
4102 Don't make a DECL node; just return the ..._TYPE node.
4103 FIELD for a struct or union field; make a FIELD_DECL.
4104 BITFIELD for a field with specified width.
4105 INITIALIZED is 1 if the decl has an initializer.
4107 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4108 It may also be so in the PARM case, for a prototype where the
4109 argument type is specified but not the name.
4111 This function is where the complicated C meanings of `static'
4112 and `extern' are interpreted. */
4115 grokdeclarator (declarator, declspecs, decl_context, initialized)
4118 enum decl_context decl_context;
4123 tree type = NULL_TREE;
4128 int explicit_int = 0;
4129 int explicit_char = 0;
4130 int defaulted_int = 0;
4131 tree typedef_decl = 0;
4133 tree typedef_type = 0;
4134 int funcdef_flag = 0;
4135 enum tree_code innermost_code = ERROR_MARK;
4137 int size_varies = 0;
4138 tree decl_machine_attr = NULL_TREE;
4140 if (decl_context == BITFIELD)
4141 bitfield = 1, decl_context = FIELD;
4143 if (decl_context == FUNCDEF)
4144 funcdef_flag = 1, decl_context = NORMAL;
4146 push_obstacks_nochange ();
4148 if (flag_traditional && allocation_temporary_p ())
4149 end_temporary_allocation ();
4151 /* Look inside a declarator for the name being declared
4152 and get it as a string, for an error message. */
4154 register tree decl = declarator;
4158 switch (TREE_CODE (decl))
4163 innermost_code = TREE_CODE (decl);
4164 decl = TREE_OPERAND (decl, 0);
4167 case IDENTIFIER_NODE:
4168 name = IDENTIFIER_POINTER (decl);
4179 /* A function definition's declarator must have the form of
4180 a function declarator. */
4182 if (funcdef_flag && innermost_code != CALL_EXPR)
4185 /* Anything declared one level down from the top level
4186 must be one of the parameters of a function
4187 (because the body is at least two levels down). */
4189 /* If this looks like a function definition, make it one,
4190 even if it occurs where parms are expected.
4191 Then store_parm_decls will reject it and not use it as a parm. */
4192 if (decl_context == NORMAL && !funcdef_flag
4193 && current_binding_level->parm_flag)
4194 decl_context = PARM;
4196 /* Look through the decl specs and record which ones appear.
4197 Some typespecs are defined as built-in typenames.
4198 Others, the ones that are modifiers of other types,
4199 are represented by bits in SPECBITS: set the bits for
4200 the modifiers that appear. Storage class keywords are also in SPECBITS.
4202 If there is a typedef name or a type, store the type in TYPE.
4203 This includes builtin typedefs such as `int'.
4205 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4206 and did not come from a user typedef.
4208 Set LONGLONG if `long' is mentioned twice. */
4210 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4213 register tree id = TREE_VALUE (spec);
4215 if (id == ridpointers[(int) RID_INT])
4217 if (id == ridpointers[(int) RID_CHAR])
4220 if (TREE_CODE (id) == IDENTIFIER_NODE)
4221 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4223 if (ridpointers[i] == id)
4225 if (i == (int) RID_LONG && specbits & (1<<i))
4228 error ("`long long long' is too long for GCC");
4231 if (pedantic && ! in_system_header)
4232 pedwarn ("ANSI C does not support `long long'");
4236 else if (specbits & (1 << i))
4237 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4243 error ("two or more data types in declaration of `%s'", name);
4244 /* Actual typedefs come to us as TYPE_DECL nodes. */
4245 else if (TREE_CODE (id) == TYPE_DECL)
4247 type = TREE_TYPE (id);
4248 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4251 /* Built-in types come as identifiers. */
4252 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4254 register tree t = lookup_name (id);
4255 if (TREE_TYPE (t) == error_mark_node)
4257 else if (!t || TREE_CODE (t) != TYPE_DECL)
4258 error ("`%s' fails to be a typedef or built in type",
4259 IDENTIFIER_POINTER (id));
4262 type = TREE_TYPE (t);
4266 else if (TREE_CODE (id) != ERROR_MARK)
4272 typedef_type = type;
4274 size_varies = C_TYPE_VARIABLE_SIZE (type);
4276 /* No type at all: default to `int', and set DEFAULTED_INT
4277 because it was not a user-defined typedef. */
4281 if (! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4282 | (1 << (int) RID_SIGNED)
4283 | (1 << (int) RID_UNSIGNED))))
4285 /* C9x will probably require a diagnostic here.
4286 For now, issue a warning if -Wreturn-type and this is a function,
4287 or if -Wimplicit; prefer the former warning since it is more
4289 if ((warn_implicit || warn_return_type) && funcdef_flag)
4290 warn_about_return_type = 1;
4291 else if (warn_implicit)
4292 warning ("type defaults to `int' in declaration of `%s'", name);
4296 type = integer_type_node;
4299 /* Now process the modifiers that were specified
4300 and check for invalid combinations. */
4302 /* Long double is a special combination. */
4304 if ((specbits & 1 << (int) RID_LONG)
4305 && TYPE_MAIN_VARIANT (type) == double_type_node)
4307 specbits &= ~ (1 << (int) RID_LONG);
4308 type = long_double_type_node;
4311 /* Check all other uses of type modifiers. */
4313 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4314 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4318 if (TREE_CODE (type) != INTEGER_TYPE)
4319 error ("long, short, signed or unsigned invalid for `%s'", name);
4320 else if ((specbits & 1 << (int) RID_LONG)
4321 && (specbits & 1 << (int) RID_SHORT))
4322 error ("long and short specified together for `%s'", name);
4323 else if (((specbits & 1 << (int) RID_LONG)
4324 || (specbits & 1 << (int) RID_SHORT))
4326 error ("long or short specified with char for `%s'", name);
4327 else if (((specbits & 1 << (int) RID_LONG)
4328 || (specbits & 1 << (int) RID_SHORT))
4329 && TREE_CODE (type) == REAL_TYPE)
4330 error ("long or short specified with floating type for `%s'", name);
4331 else if ((specbits & 1 << (int) RID_SIGNED)
4332 && (specbits & 1 << (int) RID_UNSIGNED))
4333 error ("signed and unsigned given together for `%s'", name);
4337 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4339 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4341 if (flag_pedantic_errors)
4346 /* Discard the type modifiers if they are invalid. */
4349 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4350 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4355 if ((specbits & (1 << (int) RID_COMPLEX))
4356 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4358 error ("complex invalid for `%s'", name);
4359 specbits &= ~ (1 << (int) RID_COMPLEX);
4362 /* Decide whether an integer type is signed or not.
4363 Optionally treat bitfields as signed by default. */
4364 if (specbits & 1 << (int) RID_UNSIGNED
4365 /* Traditionally, all bitfields are unsigned. */
4366 || (bitfield && flag_traditional
4367 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4368 || (bitfield && ! flag_signed_bitfields
4369 && (explicit_int || defaulted_int || explicit_char
4370 /* A typedef for plain `int' without `signed'
4371 can be controlled just like plain `int'. */
4372 || ! (typedef_decl != 0
4373 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4374 && TREE_CODE (type) != ENUMERAL_TYPE
4375 && !(specbits & 1 << (int) RID_SIGNED)))
4378 type = long_long_unsigned_type_node;
4379 else if (specbits & 1 << (int) RID_LONG)
4380 type = long_unsigned_type_node;
4381 else if (specbits & 1 << (int) RID_SHORT)
4382 type = short_unsigned_type_node;
4383 else if (type == char_type_node)
4384 type = unsigned_char_type_node;
4385 else if (typedef_decl)
4386 type = unsigned_type (type);
4388 type = unsigned_type_node;
4390 else if ((specbits & 1 << (int) RID_SIGNED)
4391 && type == char_type_node)
4392 type = signed_char_type_node;
4394 type = long_long_integer_type_node;
4395 else if (specbits & 1 << (int) RID_LONG)
4396 type = long_integer_type_node;
4397 else if (specbits & 1 << (int) RID_SHORT)
4398 type = short_integer_type_node;
4400 if (specbits & 1 << (int) RID_COMPLEX)
4402 /* If we just have "complex", it is equivalent to
4403 "complex double", but if any modifiers at all are specified it is
4404 the complex form of TYPE. E.g, "complex short" is
4405 "complex short int". */
4407 if (defaulted_int && ! longlong
4408 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4409 | (1 << (int) RID_SIGNED)
4410 | (1 << (int) RID_UNSIGNED))))
4411 type = complex_double_type_node;
4412 else if (type == integer_type_node)
4413 type = complex_integer_type_node;
4414 else if (type == float_type_node)
4415 type = complex_float_type_node;
4416 else if (type == double_type_node)
4417 type = complex_double_type_node;
4418 else if (type == long_double_type_node)
4419 type = complex_long_double_type_node;
4421 type = build_complex_type (type);
4424 /* Set CONSTP if this declaration is `const', whether by
4425 explicit specification or via a typedef.
4426 Likewise for VOLATILEP. */
4428 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4429 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4430 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4432 pedwarn ("duplicate `const'");
4434 pedwarn ("duplicate `volatile'");
4435 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4436 type = TYPE_MAIN_VARIANT (type);
4438 /* Warn if two storage classes are given. Default to `auto'. */
4443 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4444 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4445 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4446 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4447 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4448 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4450 /* Warn about storage classes that are invalid for certain
4451 kinds of declarations (parameters, typenames, etc.). */
4454 error ("multiple storage classes in declaration of `%s'", name);
4455 else if (funcdef_flag
4457 & ((1 << (int) RID_REGISTER)
4458 | (1 << (int) RID_AUTO)
4459 | (1 << (int) RID_TYPEDEF))))
4461 if (specbits & 1 << (int) RID_AUTO
4462 && (pedantic || current_binding_level == global_binding_level))
4463 pedwarn ("function definition declared `auto'");
4464 if (specbits & 1 << (int) RID_REGISTER)
4465 error ("function definition declared `register'");
4466 if (specbits & 1 << (int) RID_TYPEDEF)
4467 error ("function definition declared `typedef'");
4468 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4469 | (1 << (int) RID_AUTO));
4471 else if (decl_context != NORMAL && nclasses > 0)
4473 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4477 error ((decl_context == FIELD
4478 ? "storage class specified for structure field `%s'"
4479 : (decl_context == PARM
4480 ? "storage class specified for parameter `%s'"
4481 : "storage class specified for typename")),
4483 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4484 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4485 | (1 << (int) RID_EXTERN));
4488 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4490 /* `extern' with initialization is invalid if not at top level. */
4491 if (current_binding_level == global_binding_level)
4492 warning ("`%s' initialized and declared `extern'", name);
4494 error ("`%s' has both `extern' and initializer", name);
4496 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4497 && current_binding_level != global_binding_level)
4498 error ("nested function `%s' declared `extern'", name);
4499 else if (current_binding_level == global_binding_level
4500 && specbits & (1 << (int) RID_AUTO))
4501 error ("top-level declaration of `%s' specifies `auto'", name);
4502 else if ((specbits & 1 << (int) RID_ITERATOR)
4503 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4505 error ("iterator `%s' has derived type", name);
4506 type = error_mark_node;
4508 else if ((specbits & 1 << (int) RID_ITERATOR)
4509 && TREE_CODE (type) != INTEGER_TYPE)
4511 error ("iterator `%s' has noninteger type", name);
4512 type = error_mark_node;
4516 /* Now figure out the structure of the declarator proper.
4517 Descend through it, creating more complex types, until we reach
4518 the declared identifier (or NULL_TREE, in an absolute declarator). */
4520 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4522 if (type == error_mark_node)
4524 declarator = TREE_OPERAND (declarator, 0);
4528 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4529 an INDIRECT_REF (for *...),
4530 a CALL_EXPR (for ...(...)),
4531 an identifier (for the name being declared)
4532 or a null pointer (for the place in an absolute declarator
4533 where the name was omitted).
4534 For the last two cases, we have just exited the loop.
4536 At this point, TYPE is the type of elements of an array,
4537 or for a function to return, or for a pointer to point to.
4538 After this sequence of ifs, TYPE is the type of the
4539 array or function or pointer, and DECLARATOR has had its
4540 outermost layer removed. */
4542 if (TREE_CODE (declarator) == ARRAY_REF)
4544 register tree itype = NULL_TREE;
4545 register tree size = TREE_OPERAND (declarator, 1);
4546 /* An uninitialized decl with `extern' is a reference. */
4547 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4548 /* The index is a signed object `sizetype' bits wide. */
4549 tree index_type = signed_type (sizetype);
4551 declarator = TREE_OPERAND (declarator, 0);
4553 /* Check for some types that there cannot be arrays of. */
4555 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4557 error ("declaration of `%s' as array of voids", name);
4558 type = error_mark_node;
4561 if (TREE_CODE (type) == FUNCTION_TYPE)
4563 error ("declaration of `%s' as array of functions", name);
4564 type = error_mark_node;
4567 if (size == error_mark_node)
4568 type = error_mark_node;
4570 if (type == error_mark_node)
4573 /* If this is a block level extern, it must live past the end
4574 of the function so that we can check it against other extern
4575 declarations (IDENTIFIER_LIMBO_VALUE). */
4576 if (extern_ref && allocation_temporary_p ())
4577 end_temporary_allocation ();
4579 /* If size was specified, set ITYPE to a range-type for that size.
4580 Otherwise, ITYPE remains null. finish_decl may figure it out
4581 from an initial value. */
4585 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4586 STRIP_TYPE_NOPS (size);
4588 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4589 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4591 error ("size of array `%s' has non-integer type", name);
4592 size = integer_one_node;
4595 if (pedantic && integer_zerop (size))
4596 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4598 if (TREE_CODE (size) == INTEGER_CST)
4600 constant_expression_warning (size);
4601 if (tree_int_cst_sgn (size) < 0)
4603 error ("size of array `%s' is negative", name);
4604 size = integer_one_node;
4609 /* Make sure the array size remains visibly nonconstant
4610 even if it is (eg) a const variable with known value. */
4615 if (TREE_CONSTANT (size))
4616 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4618 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4622 /* Convert size to index_type, so that if it is a variable
4623 the computations will be done in the proper mode. */
4624 itype = fold (build (MINUS_EXPR, index_type,
4625 convert (index_type, size),
4626 convert (index_type, size_one_node)));
4629 itype = variable_size (itype);
4630 itype = build_index_type (itype);
4633 #if 0 /* This had bad results for pointers to arrays, as in
4634 union incomplete (*foo)[4]; */
4635 /* Complain about arrays of incomplete types, except in typedefs. */
4637 if (TYPE_SIZE (type) == 0
4638 /* Avoid multiple warnings for nested array types. */
4639 && TREE_CODE (type) != ARRAY_TYPE
4640 && !(specbits & (1 << (int) RID_TYPEDEF))
4641 && !C_TYPE_BEING_DEFINED (type))
4642 warning ("array type has incomplete element type");
4645 #if 0 /* We shouldn't have a function type here at all!
4646 Functions aren't allowed as array elements. */
4647 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4648 && (constp || volatilep))
4649 pedwarn ("ANSI C forbids const or volatile function types");
4652 /* Build the array type itself, then merge any constancy or
4653 volatility into the target type. We must do it in this order
4654 to ensure that the TYPE_MAIN_VARIANT field of the array type
4655 is set correctly. */
4657 type = build_array_type (type, itype);
4658 if (constp || volatilep)
4659 type = c_build_type_variant (type, constp, volatilep);
4661 #if 0 /* don't clear these; leave them set so that the array type
4662 or the variable is itself const or volatile. */
4668 C_TYPE_VARIABLE_SIZE (type) = 1;
4670 else if (TREE_CODE (declarator) == CALL_EXPR)
4672 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4673 || current_binding_level == global_binding_level);
4676 /* Declaring a function type.
4677 Make sure we have a valid type for the function to return. */
4678 if (type == error_mark_node)
4683 /* Warn about some types functions can't return. */
4685 if (TREE_CODE (type) == FUNCTION_TYPE)
4687 error ("`%s' declared as function returning a function", name);
4688 type = integer_type_node;
4690 if (TREE_CODE (type) == ARRAY_TYPE)
4692 error ("`%s' declared as function returning an array", name);
4693 type = integer_type_node;
4696 #ifndef TRADITIONAL_RETURN_FLOAT
4697 /* Traditionally, declaring return type float means double. */
4699 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4700 type = double_type_node;
4701 #endif /* TRADITIONAL_RETURN_FLOAT */
4703 /* If this is a block level extern, it must live past the end
4704 of the function so that we can check it against other extern
4705 declarations (IDENTIFIER_LIMBO_VALUE). */
4706 if (extern_ref && allocation_temporary_p ())
4707 end_temporary_allocation ();
4709 /* Construct the function type and go to the next
4710 inner layer of declarator. */
4712 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4714 /* Say it's a definition
4715 only for the CALL_EXPR
4716 closest to the identifier. */
4717 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4718 #if 0 /* This seems to be false. We turn off temporary allocation
4719 above in this function if -traditional.
4720 And this code caused inconsistent results with prototypes:
4721 callers would ignore them, and pass arguments wrong. */
4723 /* Omit the arg types if -traditional, since the arg types
4724 and the list links might not be permanent. */
4725 type = build_function_type (type,
4727 ? NULL_TREE : arg_types);
4729 /* ANSI seems to say that `const int foo ();'
4730 does not make the function foo const. */
4731 if (constp || volatilep)
4732 type = c_build_type_variant (type, constp, volatilep);
4736 type = build_function_type (type, arg_types);
4737 declarator = TREE_OPERAND (declarator, 0);
4739 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4740 the formal parameter list of this FUNCTION_TYPE to point to
4741 the FUNCTION_TYPE node itself. */
4746 for (link = current_function_parm_tags;
4748 link = TREE_CHAIN (link))
4749 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4752 else if (TREE_CODE (declarator) == INDIRECT_REF)
4754 /* Merge any constancy or volatility into the target type
4757 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4758 && (constp || volatilep))
4759 pedwarn ("ANSI C forbids const or volatile function types");
4760 if (constp || volatilep)
4761 type = c_build_type_variant (type, constp, volatilep);
4766 type = build_pointer_type (type);
4768 /* Process a list of type modifier keywords
4769 (such as const or volatile) that were given inside the `*'. */
4771 if (TREE_TYPE (declarator))
4773 register tree typemodlist;
4775 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4776 typemodlist = TREE_CHAIN (typemodlist))
4778 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4780 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4785 error ("invalid type modifier within pointer declarator");
4789 pedwarn ("duplicate `const'");
4791 pedwarn ("duplicate `volatile'");
4794 declarator = TREE_OPERAND (declarator, 0);
4801 /* Now TYPE has the actual type. */
4803 /* If this is declaring a typedef name, return a TYPE_DECL. */
4805 if (specbits & (1 << (int) RID_TYPEDEF))
4808 /* Note that the grammar rejects storage classes
4809 in typenames, fields or parameters */
4810 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4811 && (constp || volatilep))
4812 pedwarn ("ANSI C forbids const or volatile function types");
4813 if (constp || volatilep)
4814 type = c_build_type_variant (type, constp, volatilep);
4815 decl = build_decl (TYPE_DECL, declarator, type);
4816 if ((specbits & (1 << (int) RID_SIGNED))
4817 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4818 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4823 /* Detect the case of an array type of unspecified size
4824 which came, as such, direct from a typedef name.
4825 We must copy the type, so that each identifier gets
4826 a distinct type, so that each identifier's size can be
4827 controlled separately by its own initializer. */
4829 if (type != 0 && typedef_type != 0
4830 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4831 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4833 type = build_array_type (TREE_TYPE (type), 0);
4835 C_TYPE_VARIABLE_SIZE (type) = 1;
4838 /* If this is a type name (such as, in a cast or sizeof),
4839 compute the type and return it now. */
4841 if (decl_context == TYPENAME)
4843 /* Note that the grammar rejects storage classes
4844 in typenames, fields or parameters */
4845 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4846 && (constp || volatilep))
4847 pedwarn ("ANSI C forbids const or volatile function types");
4848 if (constp || volatilep)
4849 type = c_build_type_variant (type, constp, volatilep);
4854 /* Aside from typedefs and type names (handle above),
4855 `void' at top level (not within pointer)
4856 is allowed only in public variables.
4857 We don't complain about parms either, but that is because
4858 a better error message can be made later. */
4860 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4861 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4862 && ((specbits & (1 << (int) RID_EXTERN))
4863 || (current_binding_level == global_binding_level
4865 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4867 error ("variable or field `%s' declared void", name);
4868 type = integer_type_node;
4871 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4872 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4877 if (decl_context == PARM)
4879 tree type_as_written = type;
4882 /* A parameter declared as an array of T is really a pointer to T.
4883 One declared as a function is really a pointer to a function. */
4885 if (TREE_CODE (type) == ARRAY_TYPE)
4887 /* Transfer const-ness of array into that of type pointed to. */
4888 type = TREE_TYPE (type);
4889 if (constp || volatilep)
4890 type = c_build_type_variant (type, constp, volatilep);
4891 type = build_pointer_type (type);
4892 volatilep = constp = 0;
4895 else if (TREE_CODE (type) == FUNCTION_TYPE)
4897 if (pedantic && (constp || volatilep))
4898 pedwarn ("ANSI C forbids const or volatile function types");
4899 if (constp || volatilep)
4900 type = c_build_type_variant (type, constp, volatilep);
4901 type = build_pointer_type (type);
4902 volatilep = constp = 0;
4905 decl = build_decl (PARM_DECL, declarator, type);
4907 C_DECL_VARIABLE_SIZE (decl) = 1;
4909 /* Compute the type actually passed in the parmlist,
4910 for the case where there is no prototype.
4911 (For example, shorts and chars are passed as ints.)
4912 When there is a prototype, this is overridden later. */
4914 DECL_ARG_TYPE (decl) = type;
4915 main_type = (type == error_mark_node
4917 : TYPE_MAIN_VARIANT (type));
4918 if (main_type == float_type_node)
4919 DECL_ARG_TYPE (decl) = double_type_node;
4920 /* Don't use TYPE_PRECISION to decide whether to promote,
4921 because we should convert short if it's the same size as int,
4922 but we should not convert long if it's the same size as int. */
4923 else if (TREE_CODE (main_type) != ERROR_MARK
4924 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4926 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4927 && TREE_UNSIGNED (type))
4928 DECL_ARG_TYPE (decl) = unsigned_type_node;
4930 DECL_ARG_TYPE (decl) = integer_type_node;
4933 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4935 else if (decl_context == FIELD)
4937 /* Structure field. It may not be a function. */
4939 if (TREE_CODE (type) == FUNCTION_TYPE)
4941 error ("field `%s' declared as a function", name);
4942 type = build_pointer_type (type);
4944 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4946 error ("field `%s' has incomplete type", name);
4947 type = error_mark_node;
4949 /* Move type qualifiers down to element of an array. */
4950 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4952 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4954 TYPE_DOMAIN (type));
4955 #if 0 /* Leave the field const or volatile as well. */
4956 constp = volatilep = 0;
4959 decl = build_decl (FIELD_DECL, declarator, type);
4961 C_DECL_VARIABLE_SIZE (decl) = 1;
4963 else if (TREE_CODE (type) == FUNCTION_TYPE)
4965 /* Every function declaration is "external"
4966 except for those which are inside a function body
4967 in which `auto' is used.
4968 That is a case not specified by ANSI C,
4969 and we use it for forward declarations for nested functions. */
4970 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4971 || current_binding_level == global_binding_level);
4973 if (specbits & (1 << (int) RID_AUTO)
4974 && (pedantic || current_binding_level == global_binding_level))
4975 pedwarn ("invalid storage class for function `%s'", name);
4976 if (specbits & (1 << (int) RID_REGISTER))
4977 error ("invalid storage class for function `%s'", name);
4978 /* Function declaration not at top level.
4979 Storage classes other than `extern' are not allowed
4980 and `extern' makes no difference. */
4981 if (current_binding_level != global_binding_level
4982 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4984 pedwarn ("invalid storage class for function `%s'", name);
4986 /* If this is a block level extern, it must live past the end
4987 of the function so that we can check it against other
4988 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4989 if (extern_ref && allocation_temporary_p ())
4990 end_temporary_allocation ();
4992 decl = build_decl (FUNCTION_DECL, declarator, type);
4993 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4995 if (pedantic && (constp || volatilep)
4996 && ! DECL_IN_SYSTEM_HEADER (decl))
4997 pedwarn ("ANSI C forbids const or volatile functions");
5000 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5001 warning ("`noreturn' function returns non-void value");
5004 DECL_EXTERNAL (decl) = 1;
5005 /* Record absence of global scope for `static' or `auto'. */
5007 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5009 /* Record presence of `inline', if it is reasonable. */
5012 tree last = tree_last (TYPE_ARG_TYPES (type));
5014 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5015 warning ("cannot inline function `main'");
5016 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
5018 warning ("inline declaration ignored for function with `...'");
5020 /* Assume that otherwise the function can be inlined. */
5021 DECL_INLINE (decl) = 1;
5023 if (specbits & (1 << (int) RID_EXTERN))
5024 current_extern_inline = 1;
5029 /* It's a variable. */
5030 /* An uninitialized decl with `extern' is a reference. */
5031 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5033 /* Move type qualifiers down to element of an array. */
5034 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5036 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5038 TYPE_DOMAIN (type));
5039 #if 0 /* Leave the variable const or volatile as well. */
5040 constp = volatilep = 0;
5044 /* If this is a block level extern, it must live past the end
5045 of the function so that we can check it against other
5046 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5047 if (extern_ref && allocation_temporary_p ())
5048 end_temporary_allocation ();
5050 decl = build_decl (VAR_DECL, declarator, type);
5052 C_DECL_VARIABLE_SIZE (decl) = 1;
5055 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5057 DECL_EXTERNAL (decl) = extern_ref;
5058 /* At top level, the presence of a `static' or `register' storage
5059 class specifier, or the absence of all storage class specifiers
5060 makes this declaration a definition (perhaps tentative). Also,
5061 the absence of both `static' and `register' makes it public. */
5062 if (current_binding_level == global_binding_level)
5066 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5067 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5069 /* Not at top level, only `static' makes a static definition. */
5072 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5073 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5076 if (specbits & 1 << (int) RID_ITERATOR)
5077 ITERATOR_P (decl) = 1;
5080 /* Record `register' declaration for warnings on &
5081 and in case doing stupid register allocation. */
5083 if (specbits & (1 << (int) RID_REGISTER))
5084 DECL_REGISTER (decl) = 1;
5086 /* Record constancy and volatility. */
5089 TREE_READONLY (decl) = 1;
5092 TREE_SIDE_EFFECTS (decl) = 1;
5093 TREE_THIS_VOLATILE (decl) = 1;
5095 /* If a type has volatile components, it should be stored in memory.
5096 Otherwise, the fact that those components are volatile
5097 will be ignored, and would even crash the compiler. */
5098 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5099 mark_addressable (decl);
5107 /* Decode the parameter-list info for a function type or function definition.
5108 The argument is the value returned by `get_parm_info' (or made in parse.y
5109 if there is an identifier list instead of a parameter decl list).
5110 These two functions are separate because when a function returns
5111 or receives functions then each is called multiple times but the order
5112 of calls is different. The last call to `grokparms' is always the one
5113 that contains the formal parameter names of a function definition.
5115 Store in `last_function_parms' a chain of the decls of parms.
5116 Also store in `last_function_parm_tags' a chain of the struct, union,
5117 and enum tags declared among the parms.
5119 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5121 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5122 a mere declaration. A nonempty identifier-list gets an error message
5123 when FUNCDEF_FLAG is zero. */
5126 grokparms (parms_info, funcdef_flag)
5130 tree first_parm = TREE_CHAIN (parms_info);
5132 last_function_parms = TREE_PURPOSE (parms_info);
5133 last_function_parm_tags = TREE_VALUE (parms_info);
5135 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5136 && !in_system_header)
5137 warning ("function declaration isn't a prototype");
5140 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5143 pedwarn ("parameter names (without types) in function declaration");
5145 last_function_parms = first_parm;
5152 /* We no longer test FUNCDEF_FLAG.
5153 If the arg types are incomplete in a declaration,
5154 they must include undefined tags.
5155 These tags can never be defined in the scope of the declaration,
5156 so the types can never be completed,
5157 and no call can be compiled successfully. */
5159 /* In a fcn definition, arg types must be complete. */
5162 for (parm = last_function_parms, typelt = first_parm;
5164 parm = TREE_CHAIN (parm))
5165 /* Skip over any enumeration constants declared here. */
5166 if (TREE_CODE (parm) == PARM_DECL)
5168 /* Barf if the parameter itself has an incomplete type. */
5169 tree type = TREE_VALUE (typelt);
5170 if (TYPE_SIZE (type) == 0)
5172 if (funcdef_flag && DECL_NAME (parm) != 0)
5173 error ("parameter `%s' has incomplete type",
5174 IDENTIFIER_POINTER (DECL_NAME (parm)));
5176 warning ("parameter has incomplete type");
5179 TREE_VALUE (typelt) = error_mark_node;
5180 TREE_TYPE (parm) = error_mark_node;
5183 #if 0 /* This has been replaced by parm_tags_warning
5184 which uses a more accurate criterion for what to warn about. */
5187 /* Now warn if is a pointer to an incomplete type. */
5188 while (TREE_CODE (type) == POINTER_TYPE
5189 || TREE_CODE (type) == REFERENCE_TYPE)
5190 type = TREE_TYPE (type);
5191 type = TYPE_MAIN_VARIANT (type);
5192 if (TYPE_SIZE (type) == 0)
5194 if (DECL_NAME (parm) != 0)
5195 warning ("parameter `%s' points to incomplete type",
5196 IDENTIFIER_POINTER (DECL_NAME (parm)));
5198 warning ("parameter points to incomplete type");
5202 typelt = TREE_CHAIN (typelt);
5205 /* Allocate the list of types the way we allocate a type. */
5206 if (first_parm && ! TREE_PERMANENT (first_parm))
5208 /* Construct a copy of the list of types
5209 on the saveable obstack. */
5211 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5212 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5214 return nreverse (result);
5217 /* The list we have is permanent already. */
5223 /* Return a tree_list node with info on a parameter list just parsed.
5224 The TREE_PURPOSE is a chain of decls of those parms.
5225 The TREE_VALUE is a list of structure, union and enum tags defined.
5226 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5227 This tree_list node is later fed to `grokparms'.
5229 VOID_AT_END nonzero means append `void' to the end of the type-list.
5230 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5233 get_parm_info (void_at_end)
5236 register tree decl, t;
5237 register tree types = 0;
5239 tree tags = gettags ();
5240 tree parms = getdecls ();
5242 tree order = current_binding_level->parm_order;
5244 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5245 if (void_at_end && parms != 0
5246 && TREE_CHAIN (parms) == 0
5247 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5248 && DECL_NAME (parms) == 0)
5251 storedecls (NULL_TREE);
5252 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5253 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5256 /* Extract enumerator values and other non-parms declared with the parms.
5257 Likewise any forward parm decls that didn't have real parm decls. */
5258 for (decl = parms; decl; )
5260 tree next = TREE_CHAIN (decl);
5262 if (TREE_CODE (decl) != PARM_DECL)
5264 TREE_CHAIN (decl) = new_parms;
5267 else if (TREE_ASM_WRITTEN (decl))
5269 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5270 TREE_CHAIN (decl) = new_parms;
5276 /* Put the parm decls back in the order they were in in the parm list. */
5277 for (t = order; t; t = TREE_CHAIN (t))
5280 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5282 TREE_CHAIN (TREE_VALUE (t)) = 0;
5285 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5288 /* Store the parmlist in the binding level since the old one
5289 is no longer a valid list. (We have changed the chain pointers.) */
5290 storedecls (new_parms);
5292 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5293 /* There may also be declarations for enumerators if an enumeration
5294 type is declared among the parms. Ignore them here. */
5295 if (TREE_CODE (decl) == PARM_DECL)
5297 /* Since there is a prototype,
5298 args are passed in their declared types. */
5299 tree type = TREE_TYPE (decl);
5300 DECL_ARG_TYPE (decl) = type;
5301 #ifdef PROMOTE_PROTOTYPES
5302 if ((TREE_CODE (type) == INTEGER_TYPE
5303 || TREE_CODE (type) == ENUMERAL_TYPE)
5304 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5305 DECL_ARG_TYPE (decl) = integer_type_node;
5308 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5309 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5310 && DECL_NAME (decl) == 0)
5312 error ("`void' in parameter list must be the entire list");
5318 return saveable_tree_cons (new_parms, tags,
5319 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5321 return saveable_tree_cons (new_parms, tags, nreverse (types));
5324 /* At end of parameter list, warn about any struct, union or enum tags
5325 defined within. Do so because these types cannot ever become complete. */
5328 parmlist_tags_warning ()
5333 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5335 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5336 /* An anonymous union parm type is meaningful as a GNU extension.
5337 So don't warn for that. */
5338 if (code == UNION_TYPE && !pedantic)
5340 if (TREE_PURPOSE (elt) != 0)
5341 warning ("`%s %s' declared inside parameter list",
5342 (code == RECORD_TYPE ? "struct"
5343 : code == UNION_TYPE ? "union"
5345 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5347 warning ("anonymous %s declared inside parameter list",
5348 (code == RECORD_TYPE ? "struct"
5349 : code == UNION_TYPE ? "union"
5354 warning ("its scope is only this definition or declaration,");
5355 warning ("which is probably not what you want.");
5361 /* Get the struct, enum or union (CODE says which) with tag NAME.
5362 Define the tag as a forward-reference if it is not defined. */
5365 xref_tag (code, name)
5366 enum tree_code code;
5369 int temporary = allocation_temporary_p ();
5371 /* If a cross reference is requested, look up the type
5372 already defined for this tag and return it. */
5374 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5375 /* Even if this is the wrong type of tag, return what we found.
5376 There will be an error message anyway, from pending_xref_error.
5377 If we create an empty xref just for an invalid use of the type,
5378 the main result is to create lots of superfluous error messages. */
5382 push_obstacks_nochange ();
5384 if (current_binding_level == global_binding_level && temporary)
5385 end_temporary_allocation ();
5387 /* If no such tag is yet defined, create a forward-reference node
5388 and record it as the "definition".
5389 When a real declaration of this type is found,
5390 the forward-reference will be altered into a real type. */
5392 ref = make_node (code);
5393 if (code == ENUMERAL_TYPE)
5395 /* (In ANSI, Enums can be referred to only if already defined.) */
5397 pedwarn ("ANSI C forbids forward references to `enum' types");
5398 /* Give the type a default layout like unsigned int
5399 to avoid crashing if it does not get defined. */
5400 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5401 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5402 TREE_UNSIGNED (ref) = 1;
5403 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5404 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5405 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5408 pushtag (name, ref);
5415 /* Make sure that the tag NAME is defined *in the current binding level*
5416 at least as a forward reference.
5417 CODE says which kind of tag NAME ought to be.
5419 We also do a push_obstacks_nochange
5420 whose matching pop is in finish_struct. */
5423 start_struct (code, name)
5424 enum tree_code code;
5427 /* If there is already a tag defined at this binding level
5428 (as a forward reference), just return it. */
5430 register tree ref = 0;
5432 push_obstacks_nochange ();
5433 if (current_binding_level == global_binding_level)
5434 end_temporary_allocation ();
5437 ref = lookup_tag (code, name, current_binding_level, 1);
5438 if (ref && TREE_CODE (ref) == code)
5440 C_TYPE_BEING_DEFINED (ref) = 1;
5441 if (TYPE_FIELDS (ref))
5442 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5443 : "redefinition of `struct %s'"),
5444 IDENTIFIER_POINTER (name));
5449 /* Otherwise create a forward-reference just so the tag is in scope. */
5451 ref = make_node (code);
5452 pushtag (name, ref);
5453 C_TYPE_BEING_DEFINED (ref) = 1;
5454 TYPE_PACKED (ref) = flag_pack_struct;
5458 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5459 of a structure component, returning a FIELD_DECL node.
5460 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5462 This is done during the parsing of the struct declaration.
5463 The FIELD_DECL nodes are chained together and the lot of them
5464 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5467 grokfield (filename, line, declarator, declspecs, width)
5470 tree declarator, declspecs, width;
5474 /* The corresponding pop_obstacks is in finish_decl. */
5475 push_obstacks_nochange ();
5477 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5479 finish_decl (value, NULL_TREE, NULL_TREE);
5480 DECL_INITIAL (value) = width;
5482 maybe_objc_check_decl (value);
5486 /* Function to help qsort sort FIELD_DECLs by name order. */
5489 field_decl_cmp (xp, yp)
5490 const GENERIC_PTR xp;
5491 const GENERIC_PTR yp;
5493 tree *x = (tree *)xp, *y = (tree *)yp;
5495 if (DECL_NAME (*x) == DECL_NAME (*y))
5497 if (DECL_NAME (*x) == NULL)
5499 if (DECL_NAME (*y) == NULL)
5501 if (DECL_NAME (*x) < DECL_NAME (*y))
5506 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5507 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5508 ATTRIBUTES are attributes to be applied to the structure.
5510 We also do a pop_obstacks to match the push in start_struct. */
5513 finish_struct (t, fieldlist, attributes)
5520 int toplevel = global_binding_level == current_binding_level;
5522 /* If this type was previously laid out as a forward reference,
5523 make sure we lay it out again. */
5527 decl_attributes (t, attributes, NULL_TREE);
5529 /* Nameless union parm types are useful as GCC extension. */
5530 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5531 /* Otherwise, warn about any struct or union def. in parmlist. */
5532 if (in_parm_level_p ())
5535 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5536 : "structure defined inside parms"));
5537 else if (! flag_traditional)
5538 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5539 : "structure defined inside parms"));
5542 old_momentary = suspend_momentary ();
5546 for (x = fieldlist; x; x = TREE_CHAIN (x))
5547 if (DECL_NAME (x) != 0)
5551 pedwarn ("%s has no %smembers",
5552 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5553 (fieldlist ? "named " : ""));
5556 /* Install struct as DECL_CONTEXT of each field decl.
5557 Also process specified field sizes.
5558 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5559 The specified size is found in the DECL_INITIAL.
5560 Store 0 there, except for ": 0" fields (so we can find them
5561 and delete them, below). */
5563 for (x = fieldlist; x; x = TREE_CHAIN (x))
5565 DECL_CONTEXT (x) = t;
5566 DECL_PACKED (x) |= TYPE_PACKED (t);
5567 DECL_FIELD_SIZE (x) = 0;
5569 /* If any field is const, the structure type is pseudo-const. */
5570 if (TREE_READONLY (x))
5571 C_TYPE_FIELDS_READONLY (t) = 1;
5574 /* A field that is pseudo-const makes the structure likewise. */
5575 tree t1 = TREE_TYPE (x);
5576 while (TREE_CODE (t1) == ARRAY_TYPE)
5577 t1 = TREE_TYPE (t1);
5578 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5579 && C_TYPE_FIELDS_READONLY (t1))
5580 C_TYPE_FIELDS_READONLY (t) = 1;
5583 /* Any field that is volatile means variables of this type must be
5584 treated in some ways as volatile. */
5585 if (TREE_THIS_VOLATILE (x))
5586 C_TYPE_FIELDS_VOLATILE (t) = 1;
5588 /* Any field of nominal variable size implies structure is too. */
5589 if (C_DECL_VARIABLE_SIZE (x))
5590 C_TYPE_VARIABLE_SIZE (t) = 1;
5592 /* Detect invalid nested redefinition. */
5593 if (TREE_TYPE (x) == t)
5594 error ("nested redefinition of `%s'",
5595 IDENTIFIER_POINTER (TYPE_NAME (t)));
5597 /* Detect invalid bit-field size. */
5598 if (DECL_INITIAL (x))
5599 STRIP_NOPS (DECL_INITIAL (x));
5600 if (DECL_INITIAL (x))
5602 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5603 constant_expression_warning (DECL_INITIAL (x));
5606 error_with_decl (x, "bit-field `%s' width not an integer constant");
5607 DECL_INITIAL (x) = NULL;
5611 /* Detect invalid bit-field type. */
5612 if (DECL_INITIAL (x)
5613 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5614 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5616 error_with_decl (x, "bit-field `%s' has invalid type");
5617 DECL_INITIAL (x) = NULL;
5619 if (DECL_INITIAL (x) && pedantic
5620 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5621 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5622 /* Accept an enum that's equivalent to int or unsigned int. */
5623 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5624 && (TYPE_PRECISION (TREE_TYPE (x))
5625 == TYPE_PRECISION (integer_type_node))))
5626 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5628 /* Detect and ignore out of range field width. */
5629 if (DECL_INITIAL (x))
5631 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5633 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5635 DECL_INITIAL (x) = NULL;
5636 error_with_decl (x, "negative width in bit-field `%s'");
5638 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5639 || width > TYPE_PRECISION (TREE_TYPE (x)))
5641 DECL_INITIAL (x) = NULL;
5642 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5644 else if (width == 0 && DECL_NAME (x) != 0)
5646 error_with_decl (x, "zero width for bit-field `%s'");
5647 DECL_INITIAL (x) = NULL;
5651 /* Process valid field width. */
5652 if (DECL_INITIAL (x))
5654 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5656 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5657 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5658 TREE_UNSIGNED (TREE_TYPE (x)))
5659 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5660 TREE_UNSIGNED (TREE_TYPE (x)))))
5661 warning_with_decl (x, "`%s' is narrower than values of its type");
5663 DECL_FIELD_SIZE (x) = width;
5664 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5665 DECL_INITIAL (x) = NULL;
5669 /* field size 0 => force desired amount of alignment. */
5670 #ifdef EMPTY_FIELD_BOUNDARY
5671 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5673 #ifdef PCC_BITFIELD_TYPE_MATTERS
5674 if (PCC_BITFIELD_TYPE_MATTERS)
5675 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5676 TYPE_ALIGN (TREE_TYPE (x)));
5680 else if (TREE_TYPE (x) != error_mark_node)
5682 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5683 : TYPE_ALIGN (TREE_TYPE (x)));
5684 /* Non-bit-fields are aligned for their type, except packed
5685 fields which require only BITS_PER_UNIT alignment. */
5686 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5690 /* Now DECL_INITIAL is null on all members. */
5692 /* Delete all duplicate fields from the fieldlist */
5693 for (x = fieldlist; x && TREE_CHAIN (x);)
5694 /* Anonymous fields aren't duplicates. */
5695 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5699 register tree y = fieldlist;
5703 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5709 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5711 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5712 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5714 else x = TREE_CHAIN (x);
5717 /* Now we have the nearly final fieldlist. Record it,
5718 then lay out the structure or union (including the fields). */
5720 TYPE_FIELDS (t) = fieldlist;
5724 /* Delete all zero-width bit-fields from the front of the fieldlist */
5726 && DECL_INITIAL (fieldlist))
5727 fieldlist = TREE_CHAIN (fieldlist);
5728 /* Delete all such members from the rest of the fieldlist */
5729 for (x = fieldlist; x;)
5731 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5732 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5733 else x = TREE_CHAIN (x);
5736 /* Now we have the truly final field list.
5737 Store it in this type and in the variants. */
5739 TYPE_FIELDS (t) = fieldlist;
5741 /* If there are lots of fields, sort so we can look through them fast.
5742 We arbitrarily consider 16 or more elts to be "a lot". */
5746 for (x = fieldlist; x; x = TREE_CHAIN (x))
5757 len += list_length (x);
5758 /* Use the same allocation policy here that make_node uses, to
5759 ensure that this lives as long as the rest of the struct decl.
5760 All decls in an inline function need to be saved. */
5761 if (allocation_temporary_p ())
5762 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5764 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5766 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5767 TYPE_LANG_SPECIFIC (t)->len = len;
5769 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5771 for (x = fieldlist; x; x = TREE_CHAIN (x))
5772 field_array[len++] = x;
5774 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5778 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5780 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5781 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5782 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5785 /* If this was supposed to be a transparent union, but we can't
5786 make it one, warn and turn off the flag. */
5787 if (TREE_CODE (t) == UNION_TYPE
5788 && TYPE_TRANSPARENT_UNION (t)
5789 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5791 TYPE_TRANSPARENT_UNION (t) = 0;
5792 warning ("union cannot be made transparent");
5795 /* If this structure or union completes the type of any previous
5796 variable declaration, lay it out and output its rtl. */
5798 if (current_binding_level->n_incomplete != 0)
5801 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5803 if (TREE_TYPE (decl) == t
5804 && TREE_CODE (decl) != TYPE_DECL)
5806 layout_decl (decl, 0);
5807 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5808 maybe_objc_check_decl (decl);
5809 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5812 --current_binding_level->n_incomplete;
5814 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5815 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5817 tree element = TREE_TYPE (decl);
5818 while (TREE_CODE (element) == ARRAY_TYPE)
5819 element = TREE_TYPE (element);
5821 layout_array_type (TREE_TYPE (decl));
5826 resume_momentary (old_momentary);
5828 /* Finish debugging output for this type. */
5829 rest_of_type_compilation (t, toplevel);
5831 /* The matching push is in start_struct. */
5837 /* Lay out the type T, and its element type, and so on. */
5840 layout_array_type (t)
5843 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5844 layout_array_type (TREE_TYPE (t));
5848 /* Begin compiling the definition of an enumeration type.
5849 NAME is its name (or null if anonymous).
5850 Returns the type object, as yet incomplete.
5851 Also records info about it so that build_enumerator
5852 may be used to declare the individual values as they are read. */
5858 register tree enumtype = 0;
5860 /* If this is the real definition for a previous forward reference,
5861 fill in the contents in the same object that used to be the
5862 forward reference. */
5865 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5867 /* The corresponding pop_obstacks is in finish_enum. */
5868 push_obstacks_nochange ();
5869 /* If these symbols and types are global, make them permanent. */
5870 if (current_binding_level == global_binding_level)
5871 end_temporary_allocation ();
5873 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5875 enumtype = make_node (ENUMERAL_TYPE);
5876 pushtag (name, enumtype);
5879 C_TYPE_BEING_DEFINED (enumtype) = 1;
5881 if (TYPE_VALUES (enumtype) != 0)
5883 /* This enum is a named one that has been declared already. */
5884 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5886 /* Completely replace its old definition.
5887 The old enumerators remain defined, however. */
5888 TYPE_VALUES (enumtype) = 0;
5891 enum_next_value = integer_zero_node;
5894 if (flag_short_enums)
5895 TYPE_PACKED (enumtype) = 1;
5900 /* After processing and defining all the values of an enumeration type,
5901 install their decls in the enumeration type and finish it off.
5902 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5903 and ATTRIBUTES are the specified attributes.
5904 Returns ENUMTYPE. */
5907 finish_enum (enumtype, values, attributes)
5912 register tree pair, tem;
5913 tree minnode = 0, maxnode = 0;
5914 int lowprec, highprec, precision;
5915 int toplevel = global_binding_level == current_binding_level;
5917 if (in_parm_level_p ())
5918 warning ("enum defined inside parms");
5920 decl_attributes (enumtype, attributes, NULL_TREE);
5922 /* Calculate the maximum value of any enumerator in this type. */
5924 if (values == error_mark_node)
5925 minnode = maxnode = integer_zero_node;
5927 for (pair = values; pair; pair = TREE_CHAIN (pair))
5929 tree value = TREE_VALUE (pair);
5931 minnode = maxnode = TREE_VALUE (pair);
5934 if (tree_int_cst_lt (maxnode, value))
5936 if (tree_int_cst_lt (value, minnode))
5941 TYPE_MIN_VALUE (enumtype) = minnode;
5942 TYPE_MAX_VALUE (enumtype) = maxnode;
5944 /* An enum can have some negative values; then it is signed. */
5945 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5947 /* Determine the precision this type needs. */
5949 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5950 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5951 precision = MAX (lowprec, highprec);
5953 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5955 tree narrowest = type_for_size (precision, 1);
5958 warning ("enumeration values exceed range of largest integer");
5959 narrowest = long_long_integer_type_node;
5962 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5965 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5967 TYPE_SIZE (enumtype) = 0;
5968 layout_type (enumtype);
5970 if (values != error_mark_node)
5972 /* Change the type of the enumerators to be the enum type.
5973 Formerly this was done only for enums that fit in an int,
5974 but the comment said it was done only for enums wider than int.
5975 It seems necessary to do this for wide enums,
5976 and best not to change what's done for ordinary narrower ones. */
5977 for (pair = values; pair; pair = TREE_CHAIN (pair))
5979 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5980 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5981 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5982 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5985 /* Replace the decl nodes in VALUES with their names. */
5986 for (pair = values; pair; pair = TREE_CHAIN (pair))
5987 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5989 TYPE_VALUES (enumtype) = values;
5992 /* Fix up all variant types of this enum type. */
5993 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5995 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5996 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5997 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5998 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5999 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6000 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6001 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6002 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6005 /* Finish debugging output for this type. */
6006 rest_of_type_compilation (enumtype, toplevel);
6008 /* This matches a push in start_enum. */
6014 /* Build and install a CONST_DECL for one value of the
6015 current enumeration type (one that was begun with start_enum).
6016 Return a tree-list containing the CONST_DECL and its value.
6017 Assignment of sequential values by default is handled here. */
6020 build_enumerator (name, value)
6023 register tree decl, type;
6025 /* Validate and default VALUE. */
6027 /* Remove no-op casts from the value. */
6029 STRIP_TYPE_NOPS (value);
6033 if (TREE_CODE (value) == INTEGER_CST)
6035 value = default_conversion (value);
6036 constant_expression_warning (value);
6040 error ("enumerator value for `%s' not integer constant",
6041 IDENTIFIER_POINTER (name));
6046 /* Default based on previous value. */
6047 /* It should no longer be possible to have NON_LVALUE_EXPR
6051 value = enum_next_value;
6053 error ("overflow in enumeration values");
6056 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6058 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6059 value = integer_zero_node;
6062 /* Set basis for default for next value. */
6063 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6064 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6066 /* Now create a declaration for the enum value name. */
6068 type = TREE_TYPE (value);
6069 type = type_for_size (MAX (TYPE_PRECISION (type),
6070 TYPE_PRECISION (integer_type_node)),
6072 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6073 && TREE_UNSIGNED (type)));
6075 decl = build_decl (CONST_DECL, name, type);
6076 DECL_INITIAL (decl) = value;
6077 TREE_TYPE (value) = type;
6080 return saveable_tree_cons (decl, value, NULL_TREE);
6083 /* Create the FUNCTION_DECL for a function definition.
6084 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6085 the declaration; they describe the function's name and the type it returns,
6086 but twisted together in a fashion that parallels the syntax of C.
6088 This function creates a binding context for the function body
6089 as well as setting up the FUNCTION_DECL in current_function_decl.
6091 Returns 1 on success. If the DECLARATOR is not suitable for a function
6092 (it defines a datum instead), we return 0, which tells
6093 yyparse to report a parse error.
6095 NESTED is nonzero for a function nested within another function. */
6098 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6099 tree declarator, declspecs, prefix_attributes, attributes;
6102 tree decl1, old_decl;
6104 int old_immediate_size_expand = immediate_size_expand;
6106 current_function_returns_value = 0; /* Assume, until we see it does. */
6107 current_function_returns_null = 0;
6108 warn_about_return_type = 0;
6109 current_extern_inline = 0;
6110 c_function_varargs = 0;
6112 shadowed_labels = 0;
6114 /* Don't expand any sizes in the return type of the function. */
6115 immediate_size_expand = 0;
6117 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6119 /* If the declarator is not suitable for a function definition,
6120 cause a syntax error. */
6124 decl_attributes (decl1, prefix_attributes, attributes);
6126 announce_function (decl1);
6128 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6130 error ("return-type is an incomplete type");
6131 /* Make it return void instead. */
6133 = build_function_type (void_type_node,
6134 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6137 if (warn_about_return_type)
6138 warning ("return-type defaults to `int'");
6140 /* Save the parm names or decls from this function's declarator
6141 where store_parm_decls will find them. */
6142 current_function_parms = last_function_parms;
6143 current_function_parm_tags = last_function_parm_tags;
6145 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6146 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6147 DECL_INITIAL (decl1) = error_mark_node;
6149 /* If this definition isn't a prototype and we had a prototype declaration
6150 before, copy the arg type info from that prototype.
6151 But not if what we had before was a builtin function. */
6152 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6153 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6154 && !DECL_BUILT_IN (old_decl)
6155 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6156 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6157 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6159 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6160 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6161 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6164 /* If there is no explicit declaration, look for any out-of-scope implicit
6167 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6169 /* Optionally warn of old-fashioned def with no previous prototype. */
6170 if (warn_strict_prototypes
6171 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6172 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6173 warning ("function declaration isn't a prototype");
6174 /* Optionally warn of any global def with no previous prototype. */
6175 else if (warn_missing_prototypes
6176 && TREE_PUBLIC (decl1)
6177 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6178 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6179 warning_with_decl (decl1, "no previous prototype for `%s'");
6180 /* Optionally warn of any def with no previous prototype
6181 if the function has already been used. */
6182 else if (warn_missing_prototypes
6183 && old_decl != 0 && TREE_USED (old_decl)
6184 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6185 warning_with_decl (decl1,
6186 "`%s' was used with no prototype before its definition");
6187 /* Optionally warn of any global def with no previous declaration. */
6188 else if (warn_missing_declarations
6189 && TREE_PUBLIC (decl1)
6191 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6192 warning_with_decl (decl1, "no previous declaration for `%s'");
6193 /* Optionally warn of any def with no previous declaration
6194 if the function has already been used. */
6195 else if (warn_missing_declarations
6196 && old_decl != 0 && TREE_USED (old_decl)
6197 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6198 warning_with_decl (decl1,
6199 "`%s' was used with no declaration before its definition");
6201 /* This is a definition, not a reference.
6202 So normally clear DECL_EXTERNAL.
6203 However, `extern inline' acts like a declaration
6204 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6205 DECL_EXTERNAL (decl1) = current_extern_inline;
6207 /* This function exists in static storage.
6208 (This does not mean `static' in the C sense!) */
6209 TREE_STATIC (decl1) = 1;
6211 /* A nested function is not global. */
6212 if (current_function_decl != 0)
6213 TREE_PUBLIC (decl1) = 0;
6215 /* Record the decl so that the function name is defined.
6216 If we already have a decl for this name, and it is a FUNCTION_DECL,
6217 use the old decl. */
6219 current_function_decl = pushdecl (decl1);
6222 declare_parm_level (1);
6223 current_binding_level->subblocks_tag_transparent = 1;
6225 make_function_rtl (current_function_decl);
6227 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6228 /* Promote the value to int before returning it. */
6229 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6231 /* It retains unsignedness if traditional
6232 or if not really getting wider. */
6233 if (TREE_UNSIGNED (restype)
6234 && (flag_traditional
6235 || (TYPE_PRECISION (restype)
6236 == TYPE_PRECISION (integer_type_node))))
6237 restype = unsigned_type_node;
6239 restype = integer_type_node;
6241 DECL_RESULT (current_function_decl)
6242 = build_decl (RESULT_DECL, NULL_TREE, restype);
6245 /* Allocate further tree nodes temporarily during compilation
6246 of this function only. */
6247 temporary_allocation ();
6249 /* If this fcn was already referenced via a block-scope `extern' decl
6250 (or an implicit decl), propagate certain information about the usage. */
6251 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6252 TREE_ADDRESSABLE (current_function_decl) = 1;
6254 immediate_size_expand = old_immediate_size_expand;
6259 /* Record that this function is going to be a varargs function.
6260 This is called before store_parm_decls, which is too early
6261 to call mark_varargs directly. */
6266 c_function_varargs = 1;
6269 /* Store the parameter declarations into the current function declaration.
6270 This is called after parsing the parameter declarations, before
6271 digesting the body of the function.
6273 For an old-style definition, modify the function's type
6274 to specify at least the number of arguments. */
6279 register tree fndecl = current_function_decl;
6282 /* This is either a chain of PARM_DECLs (if a prototype was used)
6283 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6284 tree specparms = current_function_parms;
6286 /* This is a list of types declared among parms in a prototype. */
6287 tree parmtags = current_function_parm_tags;
6289 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6290 register tree parmdecls = getdecls ();
6292 /* This is a chain of any other decls that came in among the parm
6293 declarations. If a parm is declared with enum {foo, bar} x;
6294 then CONST_DECLs for foo and bar are put here. */
6297 /* Nonzero if this definition is written with a prototype. */
6300 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6302 /* This case is when the function was defined with an ANSI prototype.
6303 The parms already have decls, so we need not do anything here
6304 except record them as in effect
6305 and complain if any redundant old-style parm decls were written. */
6316 error_with_decl (fndecl,
6317 "parm types given both in parmlist and separately");
6318 /* Get rid of the erroneous decls; don't keep them on
6319 the list of parms, since they might not be PARM_DECLs. */
6320 for (decl = current_binding_level->names;
6321 decl; decl = TREE_CHAIN (decl))
6322 if (DECL_NAME (decl))
6323 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6324 for (link = current_binding_level->shadowed;
6325 link; link = TREE_CHAIN (link))
6326 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6327 current_binding_level->names = 0;
6328 current_binding_level->shadowed = 0;
6331 specparms = nreverse (specparms);
6332 for (parm = specparms; parm; parm = next)
6334 next = TREE_CHAIN (parm);
6335 if (TREE_CODE (parm) == PARM_DECL)
6337 if (DECL_NAME (parm) == 0)
6338 error_with_decl (parm, "parameter name omitted");
6339 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6341 error_with_decl (parm, "parameter `%s' declared void");
6342 /* Change the type to error_mark_node so this parameter
6343 will be ignored by assign_parms. */
6344 TREE_TYPE (parm) = error_mark_node;
6350 /* If we find an enum constant or a type tag,
6351 put it aside for the moment. */
6352 TREE_CHAIN (parm) = 0;
6353 others = chainon (others, parm);
6357 /* Get the decls in their original chain order
6358 and record in the function. */
6359 DECL_ARGUMENTS (fndecl) = getdecls ();
6362 /* If this function takes a variable number of arguments,
6363 add a phony parameter to the end of the parm list,
6364 to represent the position of the first unnamed argument. */
6365 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6368 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6369 /* Let's hope the address of the unnamed parm
6370 won't depend on its type. */
6371 TREE_TYPE (dummy) = integer_type_node;
6372 DECL_ARG_TYPE (dummy) = integer_type_node;
6373 DECL_ARGUMENTS (fndecl)
6374 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6378 /* Now pushdecl the enum constants. */
6379 for (parm = others; parm; parm = next)
6381 next = TREE_CHAIN (parm);
6382 if (DECL_NAME (parm) == 0)
6384 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6386 else if (TREE_CODE (parm) != PARM_DECL)
6390 storetags (chainon (parmtags, gettags ()));
6394 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6395 each with a parm name as the TREE_VALUE.
6397 PARMDECLS is a chain of declarations for parameters.
6398 Warning! It can also contain CONST_DECLs which are not parameters
6399 but are names of enumerators of any enum types
6400 declared among the parameters.
6402 First match each formal parameter name with its declaration.
6403 Associate decls with the names and store the decls
6404 into the TREE_PURPOSE slots. */
6406 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6407 DECL_RESULT (parm) = 0;
6409 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6411 register tree tail, found = NULL;
6413 if (TREE_VALUE (parm) == 0)
6415 error_with_decl (fndecl, "parameter name missing from parameter list");
6416 TREE_PURPOSE (parm) = 0;
6420 /* See if any of the parmdecls specifies this parm by name.
6421 Ignore any enumerator decls. */
6422 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6423 if (DECL_NAME (tail) == TREE_VALUE (parm)
6424 && TREE_CODE (tail) == PARM_DECL)
6430 /* If declaration already marked, we have a duplicate name.
6431 Complain, and don't use this decl twice. */
6432 if (found && DECL_RESULT (found) != 0)
6434 error_with_decl (found, "multiple parameters named `%s'");
6438 /* If the declaration says "void", complain and ignore it. */
6439 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6441 error_with_decl (found, "parameter `%s' declared void");
6442 TREE_TYPE (found) = integer_type_node;
6443 DECL_ARG_TYPE (found) = integer_type_node;
6444 layout_decl (found, 0);
6447 /* Traditionally, a parm declared float is actually a double. */
6448 if (found && flag_traditional
6449 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6451 TREE_TYPE (found) = double_type_node;
6452 DECL_ARG_TYPE (found) = double_type_node;
6453 layout_decl (found, 0);
6456 /* If no declaration found, default to int. */
6459 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6461 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6462 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6463 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6465 warning_with_decl (found, "type of `%s' defaults to `int'");
6469 TREE_PURPOSE (parm) = found;
6471 /* Mark this decl as "already found" -- see test, above.
6472 It is safe to use DECL_RESULT for this
6473 since it is not used in PARM_DECLs or CONST_DECLs. */
6474 DECL_RESULT (found) = error_mark_node;
6477 /* Put anything which is on the parmdecls chain and which is
6478 not a PARM_DECL onto the list NONPARMS. (The types of
6479 non-parm things which might appear on the list include
6480 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6481 any actual PARM_DECLs not matched with any names. */
6484 for (parm = parmdecls; parm; )
6486 tree next = TREE_CHAIN (parm);
6487 TREE_CHAIN (parm) = 0;
6489 if (TREE_CODE (parm) != PARM_DECL)
6490 nonparms = chainon (nonparms, parm);
6493 /* Complain about args with incomplete types. */
6494 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6496 error_with_decl (parm, "parameter `%s' has incomplete type");
6497 TREE_TYPE (parm) = error_mark_node;
6500 if (DECL_RESULT (parm) == 0)
6502 error_with_decl (parm,
6503 "declaration for parameter `%s' but no such parameter");
6504 /* Pretend the parameter was not missing.
6505 This gets us to a standard state and minimizes
6506 further error messages. */
6508 = chainon (specparms,
6509 tree_cons (parm, NULL_TREE, NULL_TREE));
6516 /* Chain the declarations together in the order of the list of names. */
6517 /* Store that chain in the function decl, replacing the list of names. */
6519 DECL_ARGUMENTS (fndecl) = 0;
6522 for (last = 0; parm; parm = TREE_CHAIN (parm))
6523 if (TREE_PURPOSE (parm))
6526 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6528 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6529 last = TREE_PURPOSE (parm);
6530 TREE_CHAIN (last) = 0;
6534 /* If there was a previous prototype,
6535 set the DECL_ARG_TYPE of each argument according to
6536 the type previously specified, and report any mismatches. */
6538 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6541 for (parm = DECL_ARGUMENTS (fndecl),
6542 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6543 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6544 != void_type_node));
6545 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6547 if (parm == 0 || type == 0
6548 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6550 error ("number of arguments doesn't match prototype");
6551 error_with_file_and_line (current_function_prototype_file,
6552 current_function_prototype_line,
6553 "prototype declaration");
6556 /* Type for passing arg must be consistent
6557 with that declared for the arg. */
6558 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6560 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6561 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6563 /* Adjust argument to match prototype. E.g. a previous
6564 `int foo(float);' prototype causes
6565 `int foo(x) float x; {...}' to be treated like
6566 `int foo(float x) {...}'. This is particularly
6567 useful for argument types like uid_t. */
6568 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6569 #ifdef PROMOTE_PROTOTYPES
6570 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6571 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6572 && TYPE_PRECISION (TREE_TYPE (parm))
6573 < TYPE_PRECISION (integer_type_node))
6574 DECL_ARG_TYPE (parm) = integer_type_node;
6578 pedwarn ("promoted argument `%s' doesn't match prototype",
6579 IDENTIFIER_POINTER (DECL_NAME (parm)));
6580 warning_with_file_and_line
6581 (current_function_prototype_file,
6582 current_function_prototype_line,
6583 "prototype declaration");
6586 /* If -traditional, allow `int' argument to match
6587 `unsigned' prototype. */
6588 else if (! (flag_traditional
6589 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6590 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6592 error ("argument `%s' doesn't match prototype",
6593 IDENTIFIER_POINTER (DECL_NAME (parm)));
6594 error_with_file_and_line (current_function_prototype_file,
6595 current_function_prototype_line,
6596 "prototype declaration");
6600 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6603 /* Otherwise, create a prototype that would match. */
6607 tree actual = 0, last = 0, type;
6609 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6611 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6614 TREE_CHAIN (last) = type;
6619 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6621 TREE_CHAIN (last) = type;
6625 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6626 of the type of this function, but we need to avoid having this
6627 affect the types of other similarly-typed functions, so we must
6628 first force the generation of an identical (but separate) type
6629 node for the relevant function type. The new node we create
6630 will be a variant of the main variant of the original function
6633 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6635 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6638 /* Now store the final chain of decls for the arguments
6639 as the decl-chain of the current lexical scope.
6640 Put the enumerators in as well, at the front so that
6641 DECL_ARGUMENTS is not modified. */
6643 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6646 /* Make sure the binding level for the top of the function body
6647 gets a BLOCK if there are any in the function.
6648 Otherwise, the dbx output is wrong. */
6650 keep_next_if_subblocks = 1;
6652 /* ??? This might be an improvement,
6653 but needs to be thought about some more. */
6655 keep_next_level_flag = 1;
6658 /* Write a record describing this function definition to the prototypes
6659 file (if requested). */
6661 gen_aux_info_record (fndecl, 1, 0, prototype);
6663 /* Initialize the RTL code for the function. */
6665 init_function_start (fndecl, input_filename, lineno);
6667 /* If this is a varargs function, inform function.c. */
6669 if (c_function_varargs)
6672 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6674 declare_function_name ();
6676 /* Set up parameters and prepare for return, for the function. */
6678 expand_function_start (fndecl, 0);
6680 /* If this function is `main', emit a call to `__main'
6681 to run global initializers, etc. */
6682 if (DECL_NAME (fndecl)
6683 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6684 && DECL_CONTEXT (fndecl) == NULL_TREE)
6685 expand_main_function ();
6688 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6689 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6690 stands for an ellipsis in the identifier list.
6692 PARMLIST is the data returned by get_parm_info for the
6693 parmlist that follows the semicolon.
6695 We return a value of the same sort that get_parm_info returns,
6696 except that it describes the combination of identifiers and parmlist. */
6699 combine_parm_decls (specparms, parmlist, void_at_end)
6700 tree specparms, parmlist;
6703 register tree fndecl = current_function_decl;
6706 tree parmdecls = TREE_PURPOSE (parmlist);
6708 /* This is a chain of any other decls that came in among the parm
6709 declarations. They were separated already by get_parm_info,
6710 so we just need to keep them separate. */
6711 tree nonparms = TREE_VALUE (parmlist);
6715 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6716 DECL_RESULT (parm) = 0;
6718 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6720 register tree tail, found = NULL;
6722 /* See if any of the parmdecls specifies this parm by name. */
6723 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6724 if (DECL_NAME (tail) == TREE_VALUE (parm))
6730 /* If declaration already marked, we have a duplicate name.
6731 Complain, and don't use this decl twice. */
6732 if (found && DECL_RESULT (found) != 0)
6734 error_with_decl (found, "multiple parameters named `%s'");
6738 /* If the declaration says "void", complain and ignore it. */
6739 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6741 error_with_decl (found, "parameter `%s' declared void");
6742 TREE_TYPE (found) = integer_type_node;
6743 DECL_ARG_TYPE (found) = integer_type_node;
6744 layout_decl (found, 0);
6747 /* Traditionally, a parm declared float is actually a double. */
6748 if (found && flag_traditional
6749 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6751 TREE_TYPE (found) = double_type_node;
6752 DECL_ARG_TYPE (found) = double_type_node;
6753 layout_decl (found, 0);
6756 /* If no declaration found, default to int. */
6759 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6761 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6762 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6763 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6764 error_with_decl (found, "type of parameter `%s' is not declared");
6768 TREE_PURPOSE (parm) = found;
6770 /* Mark this decl as "already found" -- see test, above.
6771 It is safe to use DECL_RESULT for this
6772 since it is not used in PARM_DECLs or CONST_DECLs. */
6773 DECL_RESULT (found) = error_mark_node;
6776 /* Complain about any actual PARM_DECLs not matched with any names. */
6778 for (parm = parmdecls; parm; )
6780 tree next = TREE_CHAIN (parm);
6781 TREE_CHAIN (parm) = 0;
6783 /* Complain about args with incomplete types. */
6784 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6786 error_with_decl (parm, "parameter `%s' has incomplete type");
6787 TREE_TYPE (parm) = error_mark_node;
6790 if (DECL_RESULT (parm) == 0)
6792 error_with_decl (parm,
6793 "declaration for parameter `%s' but no such parameter");
6794 /* Pretend the parameter was not missing.
6795 This gets us to a standard state and minimizes
6796 further error messages. */
6798 = chainon (specparms,
6799 tree_cons (parm, NULL_TREE, NULL_TREE));
6805 /* Chain the declarations together in the order of the list of names.
6806 At the same time, build up a list of their types, in reverse order. */
6812 for (last = 0; parm; parm = TREE_CHAIN (parm))
6813 if (TREE_PURPOSE (parm))
6816 parmdecls = TREE_PURPOSE (parm);
6818 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6819 last = TREE_PURPOSE (parm);
6820 TREE_CHAIN (last) = 0;
6822 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6827 return saveable_tree_cons (parmdecls, nonparms,
6828 nreverse (saveable_tree_cons (NULL_TREE,
6832 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6835 /* Finish up a function declaration and compile that function
6836 all the way to assembler language output. The free the storage
6837 for the function definition.
6839 This is called after parsing the body of the function definition.
6841 NESTED is nonzero if the function being finished is nested in another. */
6844 finish_function (nested)
6847 register tree fndecl = current_function_decl;
6849 /* TREE_READONLY (fndecl) = 1;
6850 This caused &foo to be of type ptr-to-const-function
6851 which then got a warning when stored in a ptr-to-function variable. */
6854 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6856 /* Must mark the RESULT_DECL as being in this function. */
6858 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6860 /* Obey `register' declarations if `setjmp' is called in this fn. */
6861 if (flag_traditional && current_function_calls_setjmp)
6863 setjmp_protect (DECL_INITIAL (fndecl));
6864 setjmp_protect_args ();
6867 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6869 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6870 != integer_type_node)
6871 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6874 #ifdef DEFAULT_MAIN_RETURN
6875 /* Make it so that `main' always returns success by default. */
6876 DEFAULT_MAIN_RETURN;
6881 /* Generate rtl for function exit. */
6882 expand_function_end (input_filename, lineno, 0);
6884 /* So we can tell if jump_optimize sets it to 1. */
6887 /* Run the optimizers and output the assembler code for this function. */
6888 rest_of_compilation (fndecl);
6890 current_function_returns_null |= can_reach_end;
6892 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6893 warning ("`noreturn' function does return");
6894 else if (warn_return_type && can_reach_end
6895 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6896 /* If this function returns non-void and control can drop through,
6898 warning ("control reaches end of non-void function");
6899 /* With just -W, complain only if function returns both with
6900 and without a value. */
6901 else if (extra_warnings
6902 && current_function_returns_value && current_function_returns_null)
6903 warning ("this function may return with or without a value");
6905 /* If requested, warn about function definitions where the function will
6906 return a value (usually of some struct or union type) which itself will
6907 take up a lot of stack space. */
6909 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6911 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6915 register tree ret_type_size = TYPE_SIZE (ret_type);
6917 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6920 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6922 if (units > larger_than_size)
6923 warning_with_decl (fndecl,
6924 "size of return value of `%s' is %u bytes",
6930 /* Free all the tree nodes making up this function. */
6931 /* Switch back to allocating nodes permanently
6932 until we start another function. */
6934 permanent_allocation (1);
6936 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6938 /* Stop pointing to the local nodes about to be freed. */
6939 /* But DECL_INITIAL must remain nonzero so we know this
6940 was an actual function definition. */
6941 /* For a nested function, this is done in pop_c_function_context. */
6942 /* If rest_of_compilation set this to 0, leave it 0. */
6943 if (DECL_INITIAL (fndecl) != 0)
6944 DECL_INITIAL (fndecl) = error_mark_node;
6945 DECL_ARGUMENTS (fndecl) = 0;
6948 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6950 #ifndef ASM_OUTPUT_CONSTRUCTOR
6951 if (! flag_gnu_linker)
6952 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6955 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6957 if (DECL_STATIC_DESTRUCTOR (fndecl))
6959 #ifndef ASM_OUTPUT_DESTRUCTOR
6960 if (! flag_gnu_linker)
6961 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6964 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6969 /* Let the error reporting routines know that we're outside a
6970 function. For a nested function, this value is used in
6971 pop_c_function_context and then reset via pop_function_context. */
6972 current_function_decl = NULL;
6976 /* Save and restore the variables in this file and elsewhere
6977 that keep track of the progress of compilation of the current function.
6978 Used for nested functions. */
6982 struct c_function *next;
6984 tree shadowed_labels;
6987 int warn_about_return_type;
6989 struct binding_level *binding_level;
6992 struct c_function *c_function_chain;
6994 /* Save and reinitialize the variables
6995 used during compilation of a C function. */
6998 push_c_function_context ()
7000 struct c_function *p
7001 = (struct c_function *) xmalloc (sizeof (struct c_function));
7004 pedwarn ("ANSI C forbids nested functions");
7006 push_function_context ();
7008 p->next = c_function_chain;
7009 c_function_chain = p;
7011 p->named_labels = named_labels;
7012 p->shadowed_labels = shadowed_labels;
7013 p->returns_value = current_function_returns_value;
7014 p->returns_null = current_function_returns_null;
7015 p->warn_about_return_type = warn_about_return_type;
7016 p->extern_inline = current_extern_inline;
7017 p->binding_level = current_binding_level;
7020 /* Restore the variables used during compilation of a C function. */
7023 pop_c_function_context ()
7025 struct c_function *p = c_function_chain;
7028 /* Bring back all the labels that were shadowed. */
7029 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7030 if (DECL_NAME (TREE_VALUE (link)) != 0)
7031 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7032 = TREE_VALUE (link);
7034 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7036 /* Stop pointing to the local nodes about to be freed. */
7037 /* But DECL_INITIAL must remain nonzero so we know this
7038 was an actual function definition. */
7039 DECL_INITIAL (current_function_decl) = error_mark_node;
7040 DECL_ARGUMENTS (current_function_decl) = 0;
7043 pop_function_context ();
7045 c_function_chain = p->next;
7047 named_labels = p->named_labels;
7048 shadowed_labels = p->shadowed_labels;
7049 current_function_returns_value = p->returns_value;
7050 current_function_returns_null = p->returns_null;
7051 warn_about_return_type = p->warn_about_return_type;
7052 current_extern_inline = p->extern_inline;
7053 current_binding_level = p->binding_level;
7058 /* integrate_decl_tree calls this function, but since we don't use the
7059 DECL_LANG_SPECIFIC field, this is a no-op. */
7062 copy_lang_decl (node)