1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
36 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
38 { NORMAL, /* Ordinary declaration */
39 FUNCDEF, /* Function definition */
40 PARM, /* Declaration of parm before function body */
41 FIELD, /* Declaration inside struct or union */
42 BITFIELD, /* Likewise but with specified width */
43 TYPENAME}; /* Typename (inside cast or sizeof) */
45 #ifndef CHAR_TYPE_SIZE
46 #define CHAR_TYPE_SIZE BITS_PER_UNIT
49 #ifndef SHORT_TYPE_SIZE
50 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
54 #define INT_TYPE_SIZE BITS_PER_WORD
57 #ifndef LONG_TYPE_SIZE
58 #define LONG_TYPE_SIZE BITS_PER_WORD
61 #ifndef LONG_LONG_TYPE_SIZE
62 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
65 #ifndef WCHAR_UNSIGNED
66 #define WCHAR_UNSIGNED 0
69 #ifndef FLOAT_TYPE_SIZE
70 #define FLOAT_TYPE_SIZE BITS_PER_WORD
73 #ifndef DOUBLE_TYPE_SIZE
74 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
77 #ifndef LONG_DOUBLE_TYPE_SIZE
78 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
81 /* We let tm.h override the types used here, to handle trivial differences
82 such as the choice of unsigned int or long unsigned int for size_t.
83 When machines start needing nontrivial differences in the size type,
84 it would be best to do something here to figure out automatically
85 from other information what type to use. */
88 #define SIZE_TYPE "long unsigned int"
92 #define PTRDIFF_TYPE "long int"
96 #define WCHAR_TYPE "int"
99 /* a node which has tree code ERROR_MARK, and whose type is itself.
100 All erroneous expressions are replaced with this node. All functions
101 that accept nodes as arguments should avoid generating error messages
102 if this node is one of the arguments, since it is undesirable to get
103 multiple error messages from one error in the input. */
105 tree error_mark_node;
107 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
109 tree short_integer_type_node;
110 tree integer_type_node;
111 tree long_integer_type_node;
112 tree long_long_integer_type_node;
114 tree short_unsigned_type_node;
115 tree unsigned_type_node;
116 tree long_unsigned_type_node;
117 tree long_long_unsigned_type_node;
119 tree boolean_type_node;
120 tree boolean_false_node;
121 tree boolean_true_node;
123 tree ptrdiff_type_node;
125 tree unsigned_char_type_node;
126 tree signed_char_type_node;
128 tree wchar_type_node;
129 tree signed_wchar_type_node;
130 tree unsigned_wchar_type_node;
132 tree float_type_node;
133 tree double_type_node;
134 tree long_double_type_node;
136 tree complex_integer_type_node;
137 tree complex_float_type_node;
138 tree complex_double_type_node;
139 tree complex_long_double_type_node;
141 tree intQI_type_node;
142 tree intHI_type_node;
143 tree intSI_type_node;
144 tree intDI_type_node;
146 tree unsigned_intQI_type_node;
147 tree unsigned_intHI_type_node;
148 tree unsigned_intSI_type_node;
149 tree unsigned_intDI_type_node;
151 /* a VOID_TYPE node. */
155 /* Nodes for types `void *' and `const void *'. */
157 tree ptr_type_node, const_ptr_type_node;
159 /* Nodes for types `char *' and `const char *'. */
161 tree string_type_node, const_string_type_node;
163 /* Type `char[SOMENUMBER]'.
164 Used when an array of char is needed and the size is irrelevant. */
166 tree char_array_type_node;
168 /* Type `int[SOMENUMBER]' or something like it.
169 Used when an array of int needed and the size is irrelevant. */
171 tree int_array_type_node;
173 /* Type `wchar_t[SOMENUMBER]' or something like it.
174 Used when a wide string literal is created. */
176 tree wchar_array_type_node;
178 /* type `int ()' -- used for implicit declaration of functions. */
180 tree default_function_type;
182 /* function types `double (double)' and `double (double, double)', etc. */
184 tree double_ftype_double, double_ftype_double_double;
185 tree int_ftype_int, long_ftype_long;
186 tree float_ftype_float;
187 tree ldouble_ftype_ldouble;
189 /* Function type `void (void *, void *, int)' and similar ones */
191 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
193 /* Function type `char *(char *, char *)' and similar ones */
194 tree string_ftype_ptr_ptr, int_ftype_string_string;
196 /* Function type `int (const void *, const void *, size_t)' */
197 tree int_ftype_cptr_cptr_sizet;
199 /* Two expressions that are constants with value zero.
200 The first is of type `int', the second of type `void *'. */
202 tree integer_zero_node;
203 tree null_pointer_node;
205 /* A node for the integer constant 1. */
207 tree integer_one_node;
209 /* Nonzero if we have seen an invalid cross reference
210 to a struct, union, or enum, but not yet printed the message. */
212 tree pending_invalid_xref;
213 /* File and line to appear in the eventual error message. */
214 char *pending_invalid_xref_file;
215 int pending_invalid_xref_line;
217 /* While defining an enum type, this is 1 plus the last enumerator
218 constant value. Note that will do not have to save this or `enum_overflow'
219 around nested function definition since such a definition could only
220 occur in an enum value expression and we don't use these variables in
223 static tree enum_next_value;
225 /* Nonzero means that there was overflow computing enum_next_value. */
227 static int enum_overflow;
229 /* Parsing a function declarator leaves a list of parameter names
230 or a chain or parameter decls here. */
232 static tree last_function_parms;
234 /* Parsing a function declarator leaves here a chain of structure
235 and enum types declared in the parmlist. */
237 static tree last_function_parm_tags;
239 /* After parsing the declarator that starts a function definition,
240 `start_function' puts here the list of parameter names or chain of decls.
241 `store_parm_decls' finds it here. */
243 static tree current_function_parms;
245 /* Similar, for last_function_parm_tags. */
246 static tree current_function_parm_tags;
248 /* Similar, for the file and line that the prototype came from if this is
249 an old-style definition. */
250 static char *current_function_prototype_file;
251 static int current_function_prototype_line;
253 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
254 that have names. Here so we can clear out their names' definitions
255 at the end of the function. */
257 static tree named_labels;
259 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
261 static tree shadowed_labels;
263 /* Nonzero when store_parm_decls is called indicates a varargs function.
264 Value not meaningful after store_parm_decls. */
266 static int c_function_varargs;
268 /* The FUNCTION_DECL for the function currently being compiled,
269 or 0 if between functions. */
270 tree current_function_decl;
272 /* Set to 0 at beginning of a function definition, set to 1 if
273 a return statement that specifies a return value is seen. */
275 int current_function_returns_value;
277 /* Set to 0 at beginning of a function definition, set to 1 if
278 a return statement with no argument is seen. */
280 int current_function_returns_null;
282 /* Set to nonzero by `grokdeclarator' for a function
283 whose return type is defaulted, if warnings for this are desired. */
285 static int warn_about_return_type;
287 /* Nonzero when starting a function declared `extern inline'. */
289 static int current_extern_inline;
291 /* For each binding contour we allocate a binding_level structure
292 * which records the names defined in that contour.
295 * 1) one for each function definition,
296 * where internal declarations of the parameters appear.
297 * 2) one for each compound statement,
298 * to record its declarations.
300 * The current meaning of a name can be found by searching the levels from
301 * the current one out to the global one.
304 /* Note that the information in the `names' component of the global contour
305 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
309 /* A chain of _DECL nodes for all variables, constants, functions,
310 and typedef types. These are in the reverse of the order supplied.
314 /* A list of structure, union and enum definitions,
315 * for looking up tag names.
316 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
317 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
318 * or ENUMERAL_TYPE node.
322 /* For each level, a list of shadowed outer-level local definitions
323 to be restored when this level is popped.
324 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
325 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
328 /* For each level (except not the global one),
329 a chain of BLOCK nodes for all the levels
330 that were entered and exited one level down. */
333 /* The BLOCK node for this level, if one has been preallocated.
334 If 0, the BLOCK is allocated (if needed) when the level is popped. */
337 /* The binding level which this one is contained in (inherits from). */
338 struct binding_level *level_chain;
340 /* Nonzero for the level that holds the parameters of a function. */
343 /* Nonzero if this level "doesn't exist" for tags. */
344 char tag_transparent;
346 /* Nonzero if sublevels of this level "don't exist" for tags.
347 This is set in the parm level of a function definition
348 while reading the function body, so that the outermost block
349 of the function body will be tag-transparent. */
350 char subblocks_tag_transparent;
352 /* Nonzero means make a BLOCK for this level regardless of all else. */
355 /* Nonzero means make a BLOCK if this level has any subblocks. */
356 char keep_if_subblocks;
358 /* Number of decls in `names' that have incomplete
359 structure or union types. */
362 /* A list of decls giving the (reversed) specified order of parms,
363 not including any forward-decls in the parmlist.
364 This is so we can put the parms in proper order for assign_parms. */
368 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
370 /* The binding level currently in effect. */
372 static struct binding_level *current_binding_level;
374 /* A chain of binding_level structures awaiting reuse. */
376 static struct binding_level *free_binding_level;
378 /* The outermost binding level, for names of file scope.
379 This is created when the compiler is started and exists
380 through the entire run. */
382 static struct binding_level *global_binding_level;
384 /* Binding level structures are initialized by copying this one. */
386 static struct binding_level clear_binding_level
387 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
390 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
392 static int keep_next_level_flag;
394 /* Nonzero means make a BLOCK for the next level pushed
395 if it has subblocks. */
397 static int keep_next_if_subblocks;
399 /* The chain of outer levels of label scopes.
400 This uses the same data structure used for binding levels,
401 but it works differently: each link in the chain records
402 saved values of named_labels and shadowed_labels for
403 a label binding level outside the current one. */
405 static struct binding_level *label_level_chain;
407 /* Functions called automatically at the beginning and end of execution. */
409 tree static_ctors, static_dtors;
411 /* Forward declarations. */
413 static tree grokparms (), grokdeclarator ();
415 tree builtin_function ();
416 void shadow_tag_warned ();
418 static tree lookup_tag ();
419 static tree lookup_tag_reverse ();
420 tree lookup_name_current_level ();
421 static char *redeclaration_error_message ();
422 static void layout_array_type ();
424 /* C-specific option variables. */
426 /* Nonzero means allow type mismatches in conditional expressions;
427 just make their values `void'. */
429 int flag_cond_mismatch;
431 /* Nonzero means give `double' the same size as `float'. */
433 int flag_short_double;
435 /* Nonzero means don't recognize the keyword `asm'. */
439 /* Nonzero means don't recognize any builtin functions. */
443 /* Nonzero means don't recognize the non-ANSI builtin functions.
446 int flag_no_nonansi_builtin;
448 /* Nonzero means do some things the same way PCC does. */
450 int flag_traditional;
452 /* Nonzero means to allow single precision math even if we're generally
453 being traditional. */
454 int flag_allow_single_precision = 0;
456 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
458 int flag_signed_bitfields = 1;
459 int explicit_flag_signed_bitfields = 0;
461 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
463 int flag_no_ident = 0;
465 /* Nonzero means warn about implicit declarations. */
469 /* Nonzero means give string constants the type `const char *'
470 to get extra warnings from them. These warnings will be too numerous
471 to be useful, except in thoroughly ANSIfied programs. */
473 int warn_write_strings;
475 /* Nonzero means warn about pointer casts that can drop a type qualifier
476 from the pointer target type. */
480 /* Nonzero means warn when casting a function call to a type that does
481 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
482 when there is no previous declaration of sqrt or malloc. */
484 int warn_bad_function_cast;
486 /* Warn about traditional constructs whose meanings changed in ANSI C. */
488 int warn_traditional;
490 /* Nonzero means warn about sizeof(function) or addition/subtraction
491 of function pointers. */
493 int warn_pointer_arith;
495 /* Nonzero means warn for non-prototype function decls
496 or non-prototyped defs without previous prototype. */
498 int warn_strict_prototypes;
500 /* Nonzero means warn for any global function def
501 without separate previous prototype decl. */
503 int warn_missing_prototypes;
505 /* Nonzero means warn for any global function def
506 without separate previous decl. */
508 int warn_missing_declarations;
510 /* Nonzero means warn about multiple (redundant) decls for the same single
511 variable or function. */
513 int warn_redundant_decls = 0;
515 /* Nonzero means warn about extern declarations of objects not at
516 file-scope level and about *all* declarations of functions (whether
517 extern or static) not at file-scope level. Note that we exclude
518 implicit function declarations. To get warnings about those, use
521 int warn_nested_externs = 0;
523 /* Warn about *printf or *scanf format/argument anomalies. */
527 /* Warn about a subscript that has type char. */
529 int warn_char_subscripts = 0;
531 /* Warn if a type conversion is done that might have confusing results. */
535 /* Warn if adding () is suggested. */
537 int warn_parentheses;
539 /* Warn if initializer is not completely bracketed. */
541 int warn_missing_braces;
543 /* Nonzero means `$' can be in an identifier.
544 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
546 #ifndef DOLLARS_IN_IDENTIFIERS
547 #define DOLLARS_IN_IDENTIFIERS 1
549 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
551 /* Decode the string P as a language-specific option for C.
552 Return 1 if it is recognized (and handle it);
553 return 0 if not recognized. */
559 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
561 flag_traditional = 1;
562 flag_writable_strings = 1;
563 #if DOLLARS_IN_IDENTIFIERS > 0
564 dollars_in_ident = 1;
567 else if (!strcmp (p, "-fallow-single-precision"))
568 flag_allow_single_precision = 1;
569 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
571 flag_traditional = 0;
572 flag_writable_strings = 0;
573 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
575 else if (!strcmp (p, "-fdollars-in-identifiers"))
577 #if DOLLARS_IN_IDENTIFIERS > 0
578 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, dollars_in_ident = 0;
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, "-Wall"))
716 /* We save the value of warn_uninitialized, since if they put
717 -Wuninitialized on the command line, we need to generate a
718 warning about not using it without also specifying -O. */
719 if (warn_uninitialized != 1)
720 warn_uninitialized = 2;
722 warn_return_type = 1;
726 warn_char_subscripts = 1;
727 warn_parentheses = 1;
728 warn_missing_braces = 1;
736 /* Hooks for print_node. */
739 print_lang_decl (file, node, indent)
747 print_lang_type (file, node, indent)
755 print_lang_identifier (file, node, indent)
760 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
761 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
762 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
763 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
764 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
765 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
768 /* Hook called at end of compilation to assume 1 elt
769 for a top-level array decl that wasn't complete before. */
772 finish_incomplete_decl (decl)
775 if (TREE_CODE (decl) == VAR_DECL && TREE_TYPE (decl) != error_mark_node)
777 tree type = TREE_TYPE (decl);
778 if (TREE_CODE (type) == ARRAY_TYPE
779 && TYPE_DOMAIN (type) == 0
780 && TREE_CODE (decl) != TYPE_DECL)
782 complete_array_type (type, NULL_TREE, 1);
784 layout_decl (decl, 0);
789 /* Create a new `struct binding_level'. */
792 struct binding_level *
793 make_binding_level ()
796 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
799 /* Nonzero if we are currently in the global binding level. */
804 return current_binding_level == global_binding_level;
810 keep_next_level_flag = 1;
813 /* Nonzero if the current level needs to have a BLOCK made. */
818 return ((current_binding_level->keep_if_subblocks
819 && current_binding_level->blocks != 0)
820 || current_binding_level->keep
821 || current_binding_level->names != 0
822 || (current_binding_level->tags != 0
823 && !current_binding_level->tag_transparent));
826 /* Identify this binding level as a level of parameters.
827 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
828 But it turns out there is no way to pass the right value for
829 DEFINITION_FLAG, so we ignore it. */
832 declare_parm_level (definition_flag)
835 current_binding_level->parm_flag = 1;
838 /* Nonzero if currently making parm declarations. */
843 return current_binding_level->parm_flag;
846 /* Enter a new binding level.
847 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
848 not for that of tags. */
851 pushlevel (tag_transparent)
854 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
856 /* If this is the top level of a function,
857 just make sure that NAMED_LABELS is 0. */
859 if (current_binding_level == global_binding_level)
864 /* Reuse or create a struct for this binding level. */
866 if (free_binding_level)
868 newlevel = free_binding_level;
869 free_binding_level = free_binding_level->level_chain;
873 newlevel = make_binding_level ();
876 /* Add this level to the front of the chain (stack) of levels that
879 *newlevel = clear_binding_level;
880 newlevel->tag_transparent
882 || (current_binding_level
883 ? current_binding_level->subblocks_tag_transparent
885 newlevel->level_chain = current_binding_level;
886 current_binding_level = newlevel;
887 newlevel->keep = keep_next_level_flag;
888 keep_next_level_flag = 0;
889 newlevel->keep_if_subblocks = keep_next_if_subblocks;
890 keep_next_if_subblocks = 0;
893 /* Exit a binding level.
894 Pop the level off, and restore the state of the identifier-decl mappings
895 that were in effect when this level was entered.
897 If KEEP is nonzero, this level had explicit declarations, so
898 and create a "block" (a BLOCK node) for the level
899 to record its declarations and subblocks for symbol table output.
901 If FUNCTIONBODY is nonzero, this level is the body of a function,
902 so create a block as if KEEP were set and also clear out all
905 If REVERSE is nonzero, reverse the order of decls before putting
906 them into the BLOCK. */
909 poplevel (keep, reverse, functionbody)
915 /* The chain of decls was accumulated in reverse order.
916 Put it into forward order, just for cleanliness. */
918 tree tags = current_binding_level->tags;
919 tree subblocks = current_binding_level->blocks;
922 int block_previously_created;
924 keep |= current_binding_level->keep;
926 /* This warning is turned off because it causes warnings for
927 declarations like `extern struct foo *x'. */
929 /* Warn about incomplete structure types in this level. */
930 for (link = tags; link; link = TREE_CHAIN (link))
931 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
933 tree type = TREE_VALUE (link);
935 switch (TREE_CODE (type))
938 errmsg = "`struct %s' incomplete in scope ending here";
941 errmsg = "`union %s' incomplete in scope ending here";
944 errmsg = "`enum %s' incomplete in scope ending here";
947 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
948 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
950 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
951 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
955 /* Get the decls in the order they were written.
956 Usually current_binding_level->names is in reverse order.
957 But parameter decls were previously put in forward order. */
960 current_binding_level->names
961 = decls = nreverse (current_binding_level->names);
963 decls = current_binding_level->names;
965 /* Output any nested inline functions within this block
966 if they weren't already output. */
968 for (decl = decls; decl; decl = TREE_CHAIN (decl))
969 if (TREE_CODE (decl) == FUNCTION_DECL
970 && ! TREE_ASM_WRITTEN (decl)
971 && DECL_INITIAL (decl) != 0
972 && TREE_ADDRESSABLE (decl))
974 /* If this decl was copied from a file-scope decl
975 on account of a block-scope extern decl,
976 propagate TREE_ADDRESSABLE to the file-scope decl.
978 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
979 true, since then the decl goes through save_for_inline_copying. */
980 if (DECL_ABSTRACT_ORIGIN (decl) != 0
981 && DECL_ABSTRACT_ORIGIN (decl) != decl)
982 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
985 push_function_context ();
986 output_inline_function (decl);
987 pop_function_context ();
991 /* If there were any declarations or structure tags in that level,
992 or if this level is a function body,
993 create a BLOCK to record them for the life of this function. */
996 block_previously_created = (current_binding_level->this_block != 0);
997 if (block_previously_created)
998 block = current_binding_level->this_block;
999 else if (keep || functionbody
1000 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1001 block = make_node (BLOCK);
1004 BLOCK_VARS (block) = decls;
1005 BLOCK_TYPE_TAGS (block) = tags;
1006 BLOCK_SUBBLOCKS (block) = subblocks;
1007 remember_end_note (block);
1010 /* In each subblock, record that this is its superior. */
1012 for (link = subblocks; link; link = TREE_CHAIN (link))
1013 BLOCK_SUPERCONTEXT (link) = block;
1015 /* Clear out the meanings of the local variables of this level. */
1017 for (link = decls; link; link = TREE_CHAIN (link))
1019 if (DECL_NAME (link) != 0)
1021 /* If the ident. was used or addressed via a local extern decl,
1022 don't forget that fact. */
1023 if (DECL_EXTERNAL (link))
1025 if (TREE_USED (link))
1026 TREE_USED (DECL_NAME (link)) = 1;
1027 if (TREE_ADDRESSABLE (link))
1028 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1030 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1034 /* Restore all name-meanings of the outer levels
1035 that were shadowed by this level. */
1037 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1038 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1040 /* If the level being exited is the top level of a function,
1041 check over all the labels, and clear out the current
1042 (function local) meanings of their names. */
1046 /* If this is the top level block of a function,
1047 the vars are the function's parameters.
1048 Don't leave them in the BLOCK because they are
1049 found in the FUNCTION_DECL instead. */
1051 BLOCK_VARS (block) = 0;
1053 /* Clear out the definitions of all label names,
1054 since their scopes end here,
1055 and add them to BLOCK_VARS. */
1057 for (link = named_labels; link; link = TREE_CHAIN (link))
1059 register tree label = TREE_VALUE (link);
1061 if (DECL_INITIAL (label) == 0)
1063 error_with_decl (label, "label `%s' used but not defined");
1064 /* Avoid crashing later. */
1065 define_label (input_filename, lineno,
1068 else if (warn_unused && !TREE_USED (label))
1069 warning_with_decl (label, "label `%s' defined but not used");
1070 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1072 /* Put the labels into the "variables" of the
1073 top-level block, so debugger can see them. */
1074 TREE_CHAIN (label) = BLOCK_VARS (block);
1075 BLOCK_VARS (block) = label;
1079 /* Pop the current level, and free the structure for reuse. */
1082 register struct binding_level *level = current_binding_level;
1083 current_binding_level = current_binding_level->level_chain;
1085 level->level_chain = free_binding_level;
1086 free_binding_level = level;
1089 /* Dispose of the block that we just made inside some higher level. */
1091 DECL_INITIAL (current_function_decl) = block;
1094 if (!block_previously_created)
1095 current_binding_level->blocks
1096 = chainon (current_binding_level->blocks, block);
1098 /* If we did not make a block for the level just exited,
1099 any blocks made for inner levels
1100 (since they cannot be recorded as subblocks in that level)
1101 must be carried forward so they will later become subblocks
1102 of something else. */
1104 current_binding_level->blocks
1105 = chainon (current_binding_level->blocks, subblocks);
1107 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1108 binding contour so that they point to the appropriate construct, i.e.
1109 either to the current FUNCTION_DECL node, or else to the BLOCK node
1110 we just constructed.
1112 Note that for tagged types whose scope is just the formal parameter
1113 list for some function type specification, we can't properly set
1114 their TYPE_CONTEXTs here, because we don't have a pointer to the
1115 appropriate FUNCTION_TYPE node readily available to us. For those
1116 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1117 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1118 node which will represent the "scope" for these "parameter list local"
1123 for (link = tags; link; link = TREE_CHAIN (link))
1124 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1126 for (link = tags; link; link = TREE_CHAIN (link))
1127 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1130 TREE_USED (block) = 1;
1134 /* Delete the node BLOCK from the current binding level.
1135 This is used for the block inside a stmt expr ({...})
1136 so that the block can be reinserted where appropriate. */
1139 delete_block (block)
1143 if (current_binding_level->blocks == block)
1144 current_binding_level->blocks = TREE_CHAIN (block);
1145 for (t = current_binding_level->blocks; t;)
1147 if (TREE_CHAIN (t) == block)
1148 TREE_CHAIN (t) = TREE_CHAIN (block);
1152 TREE_CHAIN (block) = NULL;
1153 /* Clear TREE_USED which is always set by poplevel.
1154 The flag is set again if insert_block is called. */
1155 TREE_USED (block) = 0;
1158 /* Insert BLOCK at the end of the list of subblocks of the
1159 current binding level. This is used when a BIND_EXPR is expanded,
1160 to handle the BLOCK node inside the BIND_EXPR. */
1163 insert_block (block)
1166 TREE_USED (block) = 1;
1167 current_binding_level->blocks
1168 = chainon (current_binding_level->blocks, block);
1171 /* Set the BLOCK node for the innermost scope
1172 (the one we are currently in). */
1176 register tree block;
1178 current_binding_level->this_block = block;
1184 register struct binding_level *newlevel;
1186 /* Reuse or create a struct for this binding level. */
1188 if (free_binding_level)
1190 newlevel = free_binding_level;
1191 free_binding_level = free_binding_level->level_chain;
1195 newlevel = make_binding_level ();
1198 /* Add this level to the front of the chain (stack) of label levels. */
1200 newlevel->level_chain = label_level_chain;
1201 label_level_chain = newlevel;
1203 newlevel->names = named_labels;
1204 newlevel->shadowed = shadowed_labels;
1206 shadowed_labels = 0;
1212 register struct binding_level *level = label_level_chain;
1215 /* Clear out the definitions of the declared labels in this level.
1216 Leave in the list any ordinary, non-declared labels. */
1217 for (link = named_labels, prev = 0; link;)
1219 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1221 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1223 error_with_decl (TREE_VALUE (link),
1224 "label `%s' used but not defined");
1225 /* Avoid crashing later. */
1226 define_label (input_filename, lineno,
1227 DECL_NAME (TREE_VALUE (link)));
1229 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1230 warning_with_decl (TREE_VALUE (link),
1231 "label `%s' defined but not used");
1232 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1234 /* Delete this element from the list. */
1235 link = TREE_CHAIN (link);
1237 TREE_CHAIN (prev) = link;
1239 named_labels = link;
1244 link = TREE_CHAIN (link);
1248 /* Bring back all the labels that were shadowed. */
1249 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1250 if (DECL_NAME (TREE_VALUE (link)) != 0)
1251 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1252 = TREE_VALUE (link);
1254 named_labels = chainon (named_labels, level->names);
1255 shadowed_labels = level->shadowed;
1257 /* Pop the current level, and free the structure for reuse. */
1258 label_level_chain = label_level_chain->level_chain;
1259 level->level_chain = free_binding_level;
1260 free_binding_level = level;
1263 /* Push a definition or a declaration of struct, union or enum tag "name".
1264 "type" should be the type node.
1265 We assume that the tag "name" is not already defined.
1267 Note that the definition may really be just a forward reference.
1268 In that case, the TYPE_SIZE will be zero. */
1271 pushtag (name, type)
1274 register struct binding_level *b;
1276 /* Find the proper binding level for this type tag. */
1278 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1283 /* Record the identifier as the type's name if it has none. */
1285 if (TYPE_NAME (type) == 0)
1286 TYPE_NAME (type) = name;
1289 if (b == global_binding_level)
1290 b->tags = perm_tree_cons (name, type, b->tags);
1292 b->tags = saveable_tree_cons (name, type, b->tags);
1294 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1295 tagged type we just added to the current binding level. This fake
1296 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1297 to output a representation of a tagged type, and it also gives
1298 us a convenient place to record the "scope start" address for the
1301 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1304 /* Handle when a new declaration NEWDECL
1305 has the same name as an old one OLDDECL
1306 in the same binding contour.
1307 Prints an error message if appropriate.
1309 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1310 Otherwise, return 0. */
1313 duplicate_decls (newdecl, olddecl)
1314 register tree newdecl, olddecl;
1316 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1317 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1318 && DECL_INITIAL (newdecl) != 0);
1319 tree oldtype = TREE_TYPE (olddecl);
1320 tree newtype = TREE_TYPE (newdecl);
1323 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1324 DECL_MACHINE_ATTRIBUTES (newdecl) = DECL_MACHINE_ATTRIBUTES (olddecl);
1326 if (TREE_CODE (newtype) == ERROR_MARK
1327 || TREE_CODE (oldtype) == ERROR_MARK)
1330 /* New decl is completely inconsistent with the old one =>
1331 tell caller to replace the old one.
1332 This is always an error except in the case of shadowing a builtin. */
1333 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1335 if (TREE_CODE (olddecl) == FUNCTION_DECL
1336 && (DECL_BUILT_IN (olddecl)
1337 || DECL_BUILT_IN_NONANSI (olddecl)))
1339 /* If you declare a built-in or predefined function name as static,
1340 the old definition is overridden,
1341 but optionally warn this was a bad choice of name. */
1342 if (!TREE_PUBLIC (newdecl))
1346 else if (DECL_BUILT_IN (olddecl))
1347 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1349 warning_with_decl (newdecl, "shadowing library function `%s'");
1351 /* Likewise, if the built-in is not ansi, then programs can
1352 override it even globally without an error. */
1353 else if (! DECL_BUILT_IN (olddecl))
1354 warning_with_decl (newdecl,
1355 "library function `%s' declared as non-function");
1357 else if (DECL_BUILT_IN_NONANSI (olddecl))
1358 warning_with_decl (newdecl,
1359 "built-in function `%s' declared as non-function");
1361 warning_with_decl (newdecl,
1362 "built-in function `%s' declared as non-function");
1366 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1367 error_with_decl (olddecl, "previous declaration of `%s'");
1373 /* For real parm decl following a forward decl,
1374 return 1 so old decl will be reused. */
1375 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1376 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1379 /* The new declaration is the same kind of object as the old one.
1380 The declarations may partially match. Print warnings if they don't
1381 match enough. Ultimately, copy most of the information from the new
1382 decl to the old one, and keep using the old one. */
1384 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1385 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1386 && DECL_INITIAL (olddecl) == 0)
1387 /* If -traditional, avoid error for redeclaring fcn
1388 after implicit decl. */
1390 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1391 && DECL_BUILT_IN (olddecl))
1393 /* A function declaration for a built-in function. */
1394 if (!TREE_PUBLIC (newdecl))
1396 /* If you declare a built-in function name as static, the
1397 built-in definition is overridden,
1398 but optionally warn this was a bad choice of name. */
1400 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1401 /* Discard the old built-in function. */
1404 else if (!types_match)
1406 /* Accept the return type of the new declaration if same modes. */
1407 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1408 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1410 /* Make sure we put the new type in the same obstack as the old ones.
1411 If the old types are not both in the same obstack, use the
1413 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1414 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1417 push_obstacks_nochange ();
1418 end_temporary_allocation ();
1421 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1423 /* Function types may be shared, so we can't just modify
1424 the return type of olddecl's function type. */
1426 = build_function_type (newreturntype,
1427 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1429 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1431 TREE_TYPE (olddecl) = newtype;
1433 /* Accept harmless mismatch in first argument type also.
1435 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1436 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0
1437 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))) != 0
1438 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))) != 0
1439 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))))
1441 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))))))
1443 /* Function types may be shared, so we can't just modify
1444 the return type of olddecl's function type. */
1446 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl)),
1447 tree_cons (NULL_TREE,
1448 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))),
1449 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl)))));
1451 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1453 TREE_TYPE (olddecl) = newtype;
1460 /* If types don't match for a built-in, throw away the built-in. */
1461 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1465 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1466 && DECL_SOURCE_LINE (olddecl) == 0)
1468 /* A function declaration for a predeclared function
1469 that isn't actually built in. */
1470 if (!TREE_PUBLIC (newdecl))
1472 /* If you declare it as static, the
1473 default definition is overridden. */
1476 else if (!types_match)
1478 /* If the types don't match, preserve volatility indication.
1479 Later on, we will discard everything else about the
1480 default declaration. */
1481 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1484 /* Permit char *foo () to match void *foo (...) if not pedantic,
1485 if one of them came from a system header file. */
1486 else if (!types_match
1487 && TREE_CODE (olddecl) == FUNCTION_DECL
1488 && TREE_CODE (newdecl) == FUNCTION_DECL
1489 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1490 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1491 && (DECL_IN_SYSTEM_HEADER (olddecl)
1492 || DECL_IN_SYSTEM_HEADER (newdecl))
1493 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1494 && TYPE_ARG_TYPES (oldtype) == 0
1495 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1496 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1498 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1499 && TYPE_ARG_TYPES (newtype) == 0
1500 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1501 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1504 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1505 /* Make sure we keep void * as ret type, not char *. */
1506 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1507 TREE_TYPE (newdecl) = newtype = oldtype;
1509 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1510 we will come back here again. */
1511 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1513 else if (!types_match
1514 /* Permit char *foo (int, ...); followed by char *foo ();
1516 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1518 /* Return types must still match. */
1519 && comptypes (TREE_TYPE (oldtype),
1520 TREE_TYPE (newtype))
1521 && TYPE_ARG_TYPES (newtype) == 0))
1523 error_with_decl (newdecl, "conflicting types for `%s'");
1524 /* Check for function type mismatch
1525 involving an empty arglist vs a nonempty one. */
1526 if (TREE_CODE (olddecl) == FUNCTION_DECL
1527 && comptypes (TREE_TYPE (oldtype),
1528 TREE_TYPE (newtype))
1529 && ((TYPE_ARG_TYPES (oldtype) == 0
1530 && DECL_INITIAL (olddecl) == 0)
1532 (TYPE_ARG_TYPES (newtype) == 0
1533 && DECL_INITIAL (newdecl) == 0)))
1535 /* Classify the problem further. */
1536 register tree t = TYPE_ARG_TYPES (oldtype);
1538 t = TYPE_ARG_TYPES (newtype);
1539 for (; t; t = TREE_CHAIN (t))
1541 register tree type = TREE_VALUE (t);
1543 if (TREE_CHAIN (t) == 0
1544 && TYPE_MAIN_VARIANT (type) != void_type_node)
1546 error ("A parameter list with an ellipsis can't match");
1547 error ("an empty parameter name list declaration.");
1551 if (TYPE_MAIN_VARIANT (type) == float_type_node
1552 || C_PROMOTING_INTEGER_TYPE_P (type))
1554 error ("An argument type that has a default promotion");
1555 error ("can't match an empty parameter name list declaration.");
1560 error_with_decl (olddecl, "previous declaration of `%s'");
1564 errmsg = redeclaration_error_message (newdecl, olddecl);
1567 error_with_decl (newdecl, errmsg);
1568 error_with_decl (olddecl,
1569 ((DECL_INITIAL (olddecl)
1570 && current_binding_level == global_binding_level)
1571 ? "`%s' previously defined here"
1572 : "`%s' previously declared here"));
1574 else if (TREE_CODE (newdecl) == TYPE_DECL
1575 && (DECL_IN_SYSTEM_HEADER (olddecl)
1576 || DECL_IN_SYSTEM_HEADER (newdecl)))
1578 warning_with_decl (newdecl, "redefinition of `%s'");
1581 ((DECL_INITIAL (olddecl)
1582 && current_binding_level == global_binding_level)
1583 ? "`%s' previously defined here"
1584 : "`%s' previously declared here"));
1586 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1587 && DECL_INITIAL (olddecl) != 0
1588 && TYPE_ARG_TYPES (oldtype) == 0
1589 && TYPE_ARG_TYPES (newtype) != 0)
1591 register tree type, parm;
1593 /* Prototype decl follows defn w/o prototype. */
1595 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1596 type = TYPE_ARG_TYPES (newtype),
1598 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1599 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1600 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1602 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1603 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1605 errmsg = "prototype for `%s' follows and number of arguments";
1608 /* Type for passing arg must be consistent
1609 with that declared for the arg. */
1610 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1611 /* If -traditional, allow `unsigned int' instead of `int'
1612 in the prototype. */
1613 && (! (flag_traditional
1614 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1615 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1617 errmsg = "prototype for `%s' follows and argument %d";
1623 error_with_decl (newdecl, errmsg, nargs);
1624 error_with_decl (olddecl,
1625 "doesn't match non-prototype definition here");
1629 warning_with_decl (newdecl, "prototype for `%s' follows");
1630 warning_with_decl (olddecl, "non-prototype definition here");
1633 /* Warn about mismatches in various flags. */
1636 /* Warn if function is now inline
1637 but was previously declared not inline and has been called. */
1638 if (TREE_CODE (olddecl) == FUNCTION_DECL
1639 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1640 && TREE_USED (olddecl))
1641 warning_with_decl (newdecl,
1642 "`%s' declared inline after being called");
1643 if (TREE_CODE (olddecl) == FUNCTION_DECL
1644 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1645 && DECL_INITIAL (olddecl) != 0)
1646 warning_with_decl (newdecl,
1647 "`%s' declared inline after its definition");
1649 /* If pedantic, warn when static declaration follows a non-static
1650 declaration. Otherwise, do so only for functions. */
1651 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1652 && TREE_PUBLIC (olddecl)
1653 && !TREE_PUBLIC (newdecl))
1654 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1656 /* Warn when const declaration follows a non-const
1657 declaration, but not for functions. */
1658 if (TREE_CODE (olddecl) != FUNCTION_DECL
1659 && !TREE_READONLY (olddecl)
1660 && TREE_READONLY (newdecl))
1661 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1662 /* These bits are logically part of the type, for variables.
1663 But not for functions
1664 (where qualifiers are not valid ANSI anyway). */
1665 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1666 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1667 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1668 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1672 /* Optionally warn about more than one declaration for the same name. */
1673 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1674 /* Dont warn about a function declaration
1675 followed by a definition. */
1676 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1677 && DECL_INITIAL (olddecl) == 0)
1678 /* Don't warn about extern decl followed by (tentative) definition. */
1679 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1681 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1682 warning_with_decl (olddecl, "previous declaration of `%s'");
1685 /* Copy all the DECL_... slots specified in the new decl
1686 except for any that we copy here from the old type.
1688 Past this point, we don't change OLDTYPE and NEWTYPE
1689 even if we change the types of NEWDECL and OLDDECL. */
1693 /* Make sure we put the new type in the same obstack as the old ones.
1694 If the old types are not both in the same obstack, use the permanent
1696 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1697 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1700 push_obstacks_nochange ();
1701 end_temporary_allocation ();
1704 /* Merge the data types specified in the two decls. */
1705 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1707 = TREE_TYPE (olddecl)
1708 = common_type (newtype, oldtype);
1710 /* Lay the type out, unless already done. */
1711 if (oldtype != TREE_TYPE (newdecl))
1713 if (TREE_TYPE (newdecl) != error_mark_node)
1714 layout_type (TREE_TYPE (newdecl));
1715 if (TREE_CODE (newdecl) != FUNCTION_DECL
1716 && TREE_CODE (newdecl) != TYPE_DECL
1717 && TREE_CODE (newdecl) != CONST_DECL)
1718 layout_decl (newdecl, 0);
1722 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1723 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1724 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1725 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1726 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1729 /* Keep the old rtl since we can safely use it. */
1730 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1732 /* Merge the type qualifiers. */
1733 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1734 && !TREE_THIS_VOLATILE (newdecl))
1735 TREE_THIS_VOLATILE (olddecl) = 0;
1736 if (TREE_READONLY (newdecl))
1737 TREE_READONLY (olddecl) = 1;
1738 if (TREE_THIS_VOLATILE (newdecl))
1740 TREE_THIS_VOLATILE (olddecl) = 1;
1741 if (TREE_CODE (newdecl) == VAR_DECL)
1742 make_var_volatile (newdecl);
1745 /* Keep source location of definition rather than declaration.
1746 Likewise, keep decl at outer scope. */
1747 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1748 || (DECL_CONTEXT (newdecl) != 0 && DECL_CONTEXT (olddecl) == 0))
1750 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1751 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1753 if (DECL_CONTEXT (olddecl) == 0)
1754 DECL_CONTEXT (newdecl) = 0;
1757 /* Merge the unused-warning information. */
1758 if (DECL_IN_SYSTEM_HEADER (olddecl))
1759 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1760 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1761 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1763 /* Merge the initialization information. */
1764 if (DECL_INITIAL (newdecl) == 0)
1765 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1767 /* Merge the section attribute.
1768 We want to issue an error if the sections conflict but that must be
1769 done later in decl_attributes since we are called before attributes
1771 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1772 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1774 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1776 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1777 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1782 /* If cannot merge, then use the new type and qualifiers,
1783 and don't preserve the old rtl. */
1786 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1787 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1788 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1789 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1792 /* Merge the storage class information. */
1793 /* For functions, static overrides non-static. */
1794 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1796 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1797 /* This is since we don't automatically
1798 copy the attributes of NEWDECL into OLDDECL. */
1799 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1800 /* If this clears `static', clear it in the identifier too. */
1801 if (! TREE_PUBLIC (olddecl))
1802 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1804 if (DECL_EXTERNAL (newdecl))
1806 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1807 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1808 /* An extern decl does not override previous storage class. */
1809 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1813 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1814 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1817 /* If either decl says `inline', this fn is inline,
1818 unless its definition was passed already. */
1819 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1820 DECL_INLINE (olddecl) = 1;
1821 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1823 /* Get rid of any built-in function if new arg types don't match it
1824 or if we have a function definition. */
1825 if (TREE_CODE (newdecl) == FUNCTION_DECL
1826 && DECL_BUILT_IN (olddecl)
1827 && (!types_match || new_is_definition))
1829 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1830 DECL_BUILT_IN (olddecl) = 0;
1833 /* If redeclaring a builtin function, and not a definition,
1835 Also preserve various other info from the definition. */
1836 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1838 if (DECL_BUILT_IN (olddecl))
1840 DECL_BUILT_IN (newdecl) = 1;
1841 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1844 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1846 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1847 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1848 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1849 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1852 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1853 But preserve OLDdECL's DECL_UID. */
1855 register unsigned olddecl_uid = DECL_UID (olddecl);
1857 bcopy ((char *) newdecl + sizeof (struct tree_common),
1858 (char *) olddecl + sizeof (struct tree_common),
1859 sizeof (struct tree_decl) - sizeof (struct tree_common));
1860 DECL_UID (olddecl) = olddecl_uid;
1866 /* Record a decl-node X as belonging to the current lexical scope.
1867 Check for errors (such as an incompatible declaration for the same
1868 name already seen in the same scope).
1870 Returns either X or an old decl for the same name.
1871 If an old decl is returned, it may have been smashed
1872 to agree with what X says. */
1879 register tree name = DECL_NAME (x);
1880 register struct binding_level *b = current_binding_level;
1882 DECL_CONTEXT (x) = current_function_decl;
1883 /* A local extern declaration for a function doesn't constitute nesting.
1884 A local auto declaration does, since it's a forward decl
1885 for a nested function coming later. */
1886 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1887 && DECL_EXTERNAL (x))
1888 DECL_CONTEXT (x) = 0;
1890 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1891 && x != IDENTIFIER_IMPLICIT_DECL (name)
1892 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1893 && !DECL_IN_SYSTEM_HEADER (x))
1894 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1901 /* Don't type check externs here when -traditional. This is so that
1902 code with conflicting declarations inside blocks will get warnings
1903 not errors. X11 for instance depends on this. */
1904 if (DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
1905 t = lookup_name_current_level_global (name);
1907 t = lookup_name_current_level (name);
1908 if (t != 0 && t == error_mark_node)
1909 /* error_mark_node is 0 for a while during initialization! */
1912 error_with_decl (x, "`%s' used prior to declaration");
1917 file = DECL_SOURCE_FILE (t);
1918 line = DECL_SOURCE_LINE (t);
1921 if (t != 0 && duplicate_decls (x, t))
1923 if (TREE_CODE (t) == PARM_DECL)
1925 /* Don't allow more than one "real" duplicate
1926 of a forward parm decl. */
1927 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1930 /* If this decl is `static' and an implicit decl was seen previously,
1931 warn. But don't complain if -traditional,
1932 since traditional compilers don't complain. */
1933 if (!flag_traditional && TREE_PUBLIC (name)
1934 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1935 /* We used to warn also for explicit extern followed by static,
1936 but sometimes you need to do it that way. */
1937 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1939 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1940 IDENTIFIER_POINTER (name));
1941 pedwarn_with_file_and_line (file, line,
1942 "previous declaration of `%s'",
1943 IDENTIFIER_POINTER (name));
1946 /* If this is a global decl, and there exists a conflicting local
1947 decl in a parent block, then we can't return as yet, because we
1948 need to register this decl in the current binding block. */
1949 if (! DECL_EXTERNAL (x) || ! TREE_PUBLIC (x)
1950 || lookup_name (name) == t)
1954 /* If we are processing a typedef statement, generate a whole new
1955 ..._TYPE node (which will be just an variant of the existing
1956 ..._TYPE node with identical properties) and then install the
1957 TYPE_DECL node generated to represent the typedef name as the
1958 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1960 The whole point here is to end up with a situation where each
1961 and every ..._TYPE node the compiler creates will be uniquely
1962 associated with AT MOST one node representing a typedef name.
1963 This way, even though the compiler substitutes corresponding
1964 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1965 early on, later parts of the compiler can always do the reverse
1966 translation and get back the corresponding typedef name. For
1969 typedef struct S MY_TYPE;
1972 Later parts of the compiler might only know that `object' was of
1973 type `struct S' if if were not for code just below. With this
1974 code however, later parts of the compiler see something like:
1976 struct S' == struct S
1977 typedef struct S' MY_TYPE;
1980 And they can then deduce (from the node for type struct S') that
1981 the original object declaration was:
1985 Being able to do this is important for proper support of protoize,
1986 and also for generating precise symbolic debugging information
1987 which takes full account of the programmer's (typedef) vocabulary.
1989 Obviously, we don't want to generate a duplicate ..._TYPE node if
1990 the TYPE_DECL node that we are now processing really represents a
1991 standard built-in type.
1993 Since all standard types are effectively declared at line zero
1994 in the source file, we can easily check to see if we are working
1995 on a standard type by checking the current value of lineno. */
1997 if (TREE_CODE (x) == TYPE_DECL)
1999 if (DECL_SOURCE_LINE (x) == 0)
2001 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2002 TYPE_NAME (TREE_TYPE (x)) = x;
2004 else if (TREE_TYPE (x) != error_mark_node)
2006 tree tt = TREE_TYPE (x);
2008 tt = build_type_copy (tt);
2014 /* Multiple external decls of the same identifier ought to match.
2015 Check against both global declarations (when traditional) and out of
2016 scope (limbo) block level declarations.
2018 We get warnings about inline functions where they are defined.
2019 Avoid duplicate warnings where they are used. */
2020 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2024 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2025 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2026 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2027 decl = IDENTIFIER_GLOBAL_VALUE (name);
2028 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2029 /* Decls in limbo are always extern, so no need to check that. */
2030 decl = IDENTIFIER_LIMBO_VALUE (name);
2034 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2035 /* If old decl is built-in, we already warned if we should. */
2036 && !DECL_BUILT_IN (decl))
2038 pedwarn_with_decl (x,
2039 "type mismatch with previous external decl");
2040 pedwarn_with_decl (decl, "previous external decl of `%s'");
2044 /* If a function has had an implicit declaration, and then is defined,
2045 make sure they are compatible. */
2047 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2048 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2049 && TREE_CODE (x) == FUNCTION_DECL
2050 && ! comptypes (TREE_TYPE (x),
2051 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2053 warning_with_decl (x, "type mismatch with previous implicit declaration");
2054 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2055 "previous implicit declaration of `%s'");
2058 /* In PCC-compatibility mode, extern decls of vars with no current decl
2059 take effect at top level no matter where they are. */
2060 if (flag_traditional && DECL_EXTERNAL (x)
2061 && lookup_name (name) == 0)
2063 tree type = TREE_TYPE (x);
2065 /* But don't do this if the type contains temporary nodes. */
2068 if (type == error_mark_node)
2070 if (! TREE_PERMANENT (type))
2072 warning_with_decl (x, "type of external `%s' is not global");
2073 /* By exiting the loop early, we leave TYPE nonzero,
2074 and thus prevent globalization of the decl. */
2077 else if (TREE_CODE (type) == FUNCTION_TYPE
2078 && TYPE_ARG_TYPES (type) != 0)
2079 /* The types might not be truly local,
2080 but the list of arg types certainly is temporary.
2081 Since prototypes are nontraditional,
2082 ok not to do the traditional thing. */
2084 type = TREE_TYPE (type);
2088 b = global_binding_level;
2091 /* This name is new in its binding level.
2092 Install the new declaration and return it. */
2093 if (b == global_binding_level)
2095 /* Install a global value. */
2097 /* If the first global decl has external linkage,
2098 warn if we later see static one. */
2099 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2100 TREE_PUBLIC (name) = 1;
2102 IDENTIFIER_GLOBAL_VALUE (name) = x;
2104 /* We no longer care about any previous block level declarations. */
2105 IDENTIFIER_LIMBO_VALUE (name) = 0;
2107 /* Don't forget if the function was used via an implicit decl. */
2108 if (IDENTIFIER_IMPLICIT_DECL (name)
2109 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2110 TREE_USED (x) = 1, TREE_USED (name) = 1;
2112 /* Don't forget if its address was taken in that way. */
2113 if (IDENTIFIER_IMPLICIT_DECL (name)
2114 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2115 TREE_ADDRESSABLE (x) = 1;
2117 /* Warn about mismatches against previous implicit decl. */
2118 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2119 /* If this real decl matches the implicit, don't complain. */
2120 && ! (TREE_CODE (x) == FUNCTION_DECL
2121 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2122 == integer_type_node)))
2123 pedwarn ("`%s' was previously implicitly declared to return `int'",
2124 IDENTIFIER_POINTER (name));
2126 /* If this decl is `static' and an `extern' was seen previously,
2127 that is erroneous. */
2128 if (TREE_PUBLIC (name)
2129 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2131 /* Okay to redeclare an ANSI built-in as static. */
2132 if (t != 0 && DECL_BUILT_IN (t))
2134 /* Okay to declare a non-ANSI built-in as anything. */
2135 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2137 else if (IDENTIFIER_IMPLICIT_DECL (name))
2138 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2139 IDENTIFIER_POINTER (name));
2141 pedwarn ("`%s' was declared `extern' and later `static'",
2142 IDENTIFIER_POINTER (name));
2147 /* Here to install a non-global value. */
2148 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2149 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2150 IDENTIFIER_LOCAL_VALUE (name) = x;
2152 /* If this is an extern function declaration, see if we
2153 have a global definition or declaration for the function. */
2155 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2157 && TREE_CODE (x) == FUNCTION_DECL
2158 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2160 /* We have one. Their types must agree. */
2161 if (! comptypes (TREE_TYPE (x),
2162 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2163 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2166 /* Inner extern decl is inline if global one is.
2167 Copy enough to really inline it. */
2168 if (DECL_INLINE (oldglobal))
2170 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2171 DECL_INITIAL (x) = (current_function_decl == oldglobal
2172 ? 0 : DECL_INITIAL (oldglobal));
2173 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2174 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2175 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2176 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2177 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2178 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2180 /* Inner extern decl is built-in if global one is. */
2181 if (DECL_BUILT_IN (oldglobal))
2183 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2184 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2186 /* Keep the arg types from a file-scope fcn defn. */
2187 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2188 && DECL_INITIAL (oldglobal)
2189 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2190 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2194 #if 0 /* This case is probably sometimes the right thing to do. */
2195 /* If we have a local external declaration,
2196 then any file-scope declaration should not
2197 have been static. */
2198 if (oldlocal == 0 && oldglobal != 0
2199 && !TREE_PUBLIC (oldglobal)
2200 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2201 warning ("`%s' locally external but globally static",
2202 IDENTIFIER_POINTER (name));
2205 /* If we have a local external declaration,
2206 and no file-scope declaration has yet been seen,
2207 then if we later have a file-scope decl it must not be static. */
2210 && DECL_EXTERNAL (x)
2213 TREE_PUBLIC (name) = 1;
2215 /* Save this decl, so that we can do type checking against
2216 other decls after it falls out of scope.
2218 Only save it once. This prevents temporary decls created in
2219 expand_inline_function from being used here, since this
2220 will have been set when the inline function was parsed.
2221 It also helps give slightly better warnings. */
2222 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2223 IDENTIFIER_LIMBO_VALUE (name) = x;
2226 /* Warn if shadowing an argument at the top level of the body. */
2227 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2228 /* This warning doesn't apply to the parms of a nested fcn. */
2229 && ! current_binding_level->parm_flag
2230 /* Check that this is one level down from the parms. */
2231 && current_binding_level->level_chain->parm_flag
2232 /* Check that the decl being shadowed
2233 comes from the parm level, one level up. */
2234 && chain_member (oldlocal, current_binding_level->level_chain->names))
2236 if (TREE_CODE (oldlocal) == PARM_DECL)
2237 pedwarn ("declaration of `%s' shadows a parameter",
2238 IDENTIFIER_POINTER (name));
2240 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2241 IDENTIFIER_POINTER (name));
2244 /* Maybe warn if shadowing something else. */
2245 else if (warn_shadow && !DECL_EXTERNAL (x)
2246 /* No shadow warnings for internally generated vars. */
2247 && DECL_SOURCE_LINE (x) != 0
2248 /* No shadow warnings for vars made for inlining. */
2249 && ! DECL_FROM_INLINE (x))
2251 char *warnstring = 0;
2253 if (TREE_CODE (x) == PARM_DECL
2254 && current_binding_level->level_chain->parm_flag)
2255 /* Don't warn about the parm names in function declarator
2256 within a function declarator.
2257 It would be nice to avoid warning in any function
2258 declarator in a declaration, as opposed to a definition,
2259 but there is no way to tell it's not a definition. */
2261 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2262 warnstring = "declaration of `%s' shadows a parameter";
2263 else if (oldlocal != 0)
2264 warnstring = "declaration of `%s' shadows previous local";
2265 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2266 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2267 warnstring = "declaration of `%s' shadows global declaration";
2270 warning (warnstring, IDENTIFIER_POINTER (name));
2273 /* If storing a local value, there may already be one (inherited).
2274 If so, record it for restoration when this binding level ends. */
2276 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2279 /* Keep count of variables in this level with incomplete type. */
2280 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2284 /* Put decls on list in reverse order.
2285 We will reverse them later if necessary. */
2286 TREE_CHAIN (x) = b->names;
2292 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2295 pushdecl_top_level (x)
2299 register struct binding_level *b = current_binding_level;
2301 current_binding_level = global_binding_level;
2303 current_binding_level = b;
2307 /* Generate an implicit declaration for identifier FUNCTIONID
2308 as a function of type int (). Print a warning if appropriate. */
2311 implicitly_declare (functionid)
2315 int traditional_warning = 0;
2316 /* Only one "implicit declaration" warning per identifier. */
2317 int implicit_warning;
2319 /* Save the decl permanently so we can warn if definition follows. */
2320 push_obstacks_nochange ();
2321 end_temporary_allocation ();
2323 /* We used to reuse an old implicit decl here,
2324 but this loses with inline functions because it can clobber
2325 the saved decl chains. */
2326 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2327 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2329 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2331 /* Warn of implicit decl following explicit local extern decl.
2332 This is probably a program designed for traditional C. */
2333 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2334 traditional_warning = 1;
2336 /* Warn once of an implicit declaration. */
2337 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2339 DECL_EXTERNAL (decl) = 1;
2340 TREE_PUBLIC (decl) = 1;
2342 /* Record that we have an implicit decl and this is it. */
2343 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2345 /* ANSI standard says implicit declarations are in the innermost block.
2346 So we record the decl in the standard fashion.
2347 If flag_traditional is set, pushdecl does it top-level. */
2350 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2351 maybe_objc_check_decl (decl);
2353 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2355 if (warn_implicit && implicit_warning)
2356 warning ("implicit declaration of function `%s'",
2357 IDENTIFIER_POINTER (functionid));
2358 else if (warn_traditional && traditional_warning)
2359 warning ("function `%s' was previously declared within a block",
2360 IDENTIFIER_POINTER (functionid));
2362 /* Write a record describing this implicit function declaration to the
2363 prototypes file (if requested). */
2365 gen_aux_info_record (decl, 0, 1, 0);
2372 /* Return zero if the declaration NEWDECL is valid
2373 when the declaration OLDDECL (assumed to be for the same name)
2374 has already been seen.
2375 Otherwise return an error message format string with a %s
2376 where the identifier should go. */
2379 redeclaration_error_message (newdecl, olddecl)
2380 tree newdecl, olddecl;
2382 if (TREE_CODE (newdecl) == TYPE_DECL)
2384 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2386 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2388 return "redefinition of `%s'";
2390 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2392 /* Declarations of functions can insist on internal linkage
2393 but they can't be inconsistent with internal linkage,
2394 so there can be no error on that account.
2395 However defining the same name twice is no good. */
2396 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2397 /* However, defining once as extern inline and a second
2398 time in another way is ok. */
2399 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2400 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2401 return "redefinition of `%s'";
2404 else if (current_binding_level == global_binding_level)
2406 /* Objects declared at top level: */
2407 /* If at least one is a reference, it's ok. */
2408 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2410 /* Reject two definitions. */
2411 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2412 return "redefinition of `%s'";
2413 /* Now we have two tentative defs, or one tentative and one real def. */
2414 /* Insist that the linkage match. */
2415 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2416 return "conflicting declarations of `%s'";
2419 else if (current_binding_level->parm_flag
2420 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2424 /* Newdecl has block scope. If olddecl has block scope also, then
2425 reject two definitions, and reject a definition together with an
2426 external reference. Otherwise, it is OK, because newdecl must
2427 be an extern reference to olddecl. */
2428 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2429 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2430 return "redeclaration of `%s'";
2435 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2436 Create one if none exists so far for the current function.
2437 This function is called for both label definitions and label references. */
2443 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2445 if (current_function_decl == 0)
2447 error ("label %s referenced outside of any function",
2448 IDENTIFIER_POINTER (id));
2452 /* Use a label already defined or ref'd with this name. */
2455 /* But not if it is inherited and wasn't declared to be inheritable. */
2456 if (DECL_CONTEXT (decl) != current_function_decl
2457 && ! C_DECLARED_LABEL_FLAG (decl))
2458 return shadow_label (id);
2462 decl = build_decl (LABEL_DECL, id, void_type_node);
2464 /* Make sure every label has an rtx. */
2467 /* A label not explicitly declared must be local to where it's ref'd. */
2468 DECL_CONTEXT (decl) = current_function_decl;
2470 DECL_MODE (decl) = VOIDmode;
2472 /* Say where one reference is to the label,
2473 for the sake of the error if it is not defined. */
2474 DECL_SOURCE_LINE (decl) = lineno;
2475 DECL_SOURCE_FILE (decl) = input_filename;
2477 IDENTIFIER_LABEL_VALUE (id) = decl;
2479 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2484 /* Make a label named NAME in the current function,
2485 shadowing silently any that may be inherited from containing functions
2486 or containing scopes.
2488 Note that valid use, if the label being shadowed
2489 comes from another scope in the same function,
2490 requires calling declare_nonlocal_label right away. */
2496 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2502 /* Check to make sure that the label hasn't already been declared
2503 at this label scope */
2504 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2505 if (TREE_VALUE (dup) == decl)
2507 error ("duplicate label declaration `%s'",
2508 IDENTIFIER_POINTER (name));
2509 error_with_decl (TREE_VALUE (dup),
2510 "this is a previous declaration");
2511 /* Just use the previous declaration. */
2512 return lookup_label (name);
2515 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2516 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2519 return lookup_label (name);
2522 /* Define a label, specifying the location in the source file.
2523 Return the LABEL_DECL node for the label, if the definition is valid.
2524 Otherwise return 0. */
2527 define_label (filename, line, name)
2532 tree decl = lookup_label (name);
2534 /* If label with this name is known from an outer context, shadow it. */
2535 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2537 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2538 IDENTIFIER_LABEL_VALUE (name) = 0;
2539 decl = lookup_label (name);
2542 if (DECL_INITIAL (decl) != 0)
2544 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2549 /* Mark label as having been defined. */
2550 DECL_INITIAL (decl) = error_mark_node;
2551 /* Say where in the source. */
2552 DECL_SOURCE_FILE (decl) = filename;
2553 DECL_SOURCE_LINE (decl) = line;
2558 /* Return the list of declarations of the current level.
2559 Note that this list is in reverse order unless/until
2560 you nreverse it; and when you do nreverse it, you must
2561 store the result back using `storedecls' or you will lose. */
2566 return current_binding_level->names;
2569 /* Return the list of type-tags (for structs, etc) of the current level. */
2574 return current_binding_level->tags;
2577 /* Store the list of declarations of the current level.
2578 This is done for the parameter declarations of a function being defined,
2579 after they are modified in the light of any missing parameters. */
2585 current_binding_level->names = decls;
2588 /* Similarly, store the list of tags of the current level. */
2594 current_binding_level->tags = tags;
2597 /* Given NAME, an IDENTIFIER_NODE,
2598 return the structure (or union or enum) definition for that name.
2599 Searches binding levels from BINDING_LEVEL up to the global level.
2600 If THISLEVEL_ONLY is nonzero, searches only the specified context
2601 (but skips any tag-transparent contexts to find one that is
2602 meaningful for tags).
2603 CODE says which kind of type the caller wants;
2604 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2605 If the wrong kind of type is found, an error is reported. */
2608 lookup_tag (code, name, binding_level, thislevel_only)
2609 enum tree_code code;
2610 struct binding_level *binding_level;
2614 register struct binding_level *level;
2616 for (level = binding_level; level; level = level->level_chain)
2619 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2621 if (TREE_PURPOSE (tail) == name)
2623 if (TREE_CODE (TREE_VALUE (tail)) != code)
2625 /* Definition isn't the kind we were looking for. */
2626 pending_invalid_xref = name;
2627 pending_invalid_xref_file = input_filename;
2628 pending_invalid_xref_line = lineno;
2630 return TREE_VALUE (tail);
2633 if (thislevel_only && ! level->tag_transparent)
2639 /* Print an error message now
2640 for a recent invalid struct, union or enum cross reference.
2641 We don't print them immediately because they are not invalid
2642 when used in the `struct foo;' construct for shadowing. */
2645 pending_xref_error ()
2647 if (pending_invalid_xref != 0)
2648 error_with_file_and_line (pending_invalid_xref_file,
2649 pending_invalid_xref_line,
2650 "`%s' defined as wrong kind of tag",
2651 IDENTIFIER_POINTER (pending_invalid_xref));
2652 pending_invalid_xref = 0;
2655 /* Given a type, find the tag that was defined for it and return the tag name.
2656 Otherwise return 0. */
2659 lookup_tag_reverse (type)
2662 register struct binding_level *level;
2664 for (level = current_binding_level; level; level = level->level_chain)
2667 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2669 if (TREE_VALUE (tail) == type)
2670 return TREE_PURPOSE (tail);
2676 /* Look up NAME in the current binding level and its superiors
2677 in the namespace of variables, functions and typedefs.
2678 Return a ..._DECL node of some kind representing its definition,
2679 or return 0 if it is undefined. */
2686 if (current_binding_level != global_binding_level
2687 && IDENTIFIER_LOCAL_VALUE (name))
2688 val = IDENTIFIER_LOCAL_VALUE (name);
2690 val = IDENTIFIER_GLOBAL_VALUE (name);
2694 /* Similar to `lookup_name' but look only at current binding level. */
2697 lookup_name_current_level (name)
2702 if (current_binding_level == global_binding_level)
2703 return IDENTIFIER_GLOBAL_VALUE (name);
2705 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2708 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2709 if (DECL_NAME (t) == name)
2715 /* Similar to `lookup_name_current_level' but also look at the global binding
2719 lookup_name_current_level_global (name)
2722 register tree t = 0;
2724 if (current_binding_level == global_binding_level)
2725 return IDENTIFIER_GLOBAL_VALUE (name);
2727 if (IDENTIFIER_LOCAL_VALUE (name) != 0)
2728 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2729 if (DECL_NAME (t) == name)
2733 t = IDENTIFIER_GLOBAL_VALUE (name);
2738 /* Create the predefined scalar types of C,
2739 and some nodes representing standard constants (0, 1, (void *)0).
2740 Initialize the global binding level.
2741 Make definitions for built-in primitive functions. */
2744 init_decl_processing ()
2746 register tree endlink;
2747 /* Either char* or void*. */
2748 tree traditional_ptr_type_node;
2749 /* Data types of memcpy and strlen. */
2750 tree memcpy_ftype, strlen_ftype;
2751 tree void_ftype_any;
2752 int wchar_type_size;
2754 tree array_domain_type;
2756 current_function_decl = NULL;
2757 named_labels = NULL;
2758 current_binding_level = NULL_BINDING_LEVEL;
2759 free_binding_level = NULL_BINDING_LEVEL;
2760 pushlevel (0); /* make the binding_level structure for global names */
2761 global_binding_level = current_binding_level;
2763 /* Define `int' and `char' first so that dbx will output them first. */
2765 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2766 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2767 integer_type_node));
2769 /* Define `char', which is like either `signed char' or `unsigned char'
2770 but not the same as either. */
2774 ? make_signed_type (CHAR_TYPE_SIZE)
2775 : make_unsigned_type (CHAR_TYPE_SIZE));
2776 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2779 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2780 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2781 long_integer_type_node));
2783 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2784 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2785 unsigned_type_node));
2787 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2788 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2789 long_unsigned_type_node));
2791 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2792 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2793 long_long_integer_type_node));
2795 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2796 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2797 long_long_unsigned_type_node));
2799 /* `unsigned long' is the standard type for sizeof.
2800 Traditionally, use a signed type.
2801 Note that stddef.h uses `unsigned long',
2802 and this must agree, even of long and int are the same size. */
2804 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2805 if (flag_traditional && TREE_UNSIGNED (sizetype))
2806 sizetype = signed_type (sizetype);
2809 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2811 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2812 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2813 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2814 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2815 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2816 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2817 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2819 error_mark_node = make_node (ERROR_MARK);
2820 TREE_TYPE (error_mark_node) = error_mark_node;
2822 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2823 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2824 short_integer_type_node));
2826 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2827 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2828 short_unsigned_type_node));
2830 /* Define both `signed char' and `unsigned char'. */
2831 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2832 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2833 signed_char_type_node));
2835 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2836 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2837 unsigned_char_type_node));
2839 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2840 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2842 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2843 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2845 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2846 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2848 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2849 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2851 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2852 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2854 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2855 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2857 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2858 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2860 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2861 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2863 float_type_node = make_node (REAL_TYPE);
2864 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2865 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2867 layout_type (float_type_node);
2869 double_type_node = make_node (REAL_TYPE);
2870 if (flag_short_double)
2871 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2873 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2874 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2876 layout_type (double_type_node);
2878 long_double_type_node = make_node (REAL_TYPE);
2879 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2880 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2881 long_double_type_node));
2882 layout_type (long_double_type_node);
2884 complex_integer_type_node = make_node (COMPLEX_TYPE);
2885 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2886 complex_integer_type_node));
2887 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2888 layout_type (complex_integer_type_node);
2890 complex_float_type_node = make_node (COMPLEX_TYPE);
2891 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2892 complex_float_type_node));
2893 TREE_TYPE (complex_float_type_node) = float_type_node;
2894 layout_type (complex_float_type_node);
2896 complex_double_type_node = make_node (COMPLEX_TYPE);
2897 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2898 complex_double_type_node));
2899 TREE_TYPE (complex_double_type_node) = double_type_node;
2900 layout_type (complex_double_type_node);
2902 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2903 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2904 complex_long_double_type_node));
2905 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2906 layout_type (complex_long_double_type_node);
2909 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2910 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2911 signed_wchar_type_node = signed_type (wchar_type_node);
2912 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2914 integer_zero_node = build_int_2 (0, 0);
2915 TREE_TYPE (integer_zero_node) = integer_type_node;
2916 integer_one_node = build_int_2 (1, 0);
2917 TREE_TYPE (integer_one_node) = integer_type_node;
2919 boolean_type_node = integer_type_node;
2920 boolean_true_node = integer_one_node;
2921 boolean_false_node = integer_zero_node;
2923 size_zero_node = build_int_2 (0, 0);
2924 TREE_TYPE (size_zero_node) = sizetype;
2925 size_one_node = build_int_2 (1, 0);
2926 TREE_TYPE (size_one_node) = sizetype;
2928 void_type_node = make_node (VOID_TYPE);
2929 pushdecl (build_decl (TYPE_DECL,
2930 ridpointers[(int) RID_VOID], void_type_node));
2931 layout_type (void_type_node); /* Uses integer_zero_node */
2932 /* We are not going to have real types in C with less than byte alignment,
2933 so we might as well not have any types that claim to have it. */
2934 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2936 null_pointer_node = build_int_2 (0, 0);
2937 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2938 layout_type (TREE_TYPE (null_pointer_node));
2940 string_type_node = build_pointer_type (char_type_node);
2941 const_string_type_node
2942 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2944 /* Make a type to be the domain of a few array types
2945 whose domains don't really matter.
2946 200 is small enough that it always fits in size_t
2947 and large enough that it can hold most function names for the
2948 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2949 array_domain_type = build_index_type (build_int_2 (200, 0));
2951 /* make a type for arrays of characters.
2952 With luck nothing will ever really depend on the length of this
2954 char_array_type_node
2955 = build_array_type (char_type_node, array_domain_type);
2956 /* Likewise for arrays of ints. */
2958 = build_array_type (integer_type_node, array_domain_type);
2959 /* This is for wide string constants. */
2960 wchar_array_type_node
2961 = build_array_type (wchar_type_node, array_domain_type);
2963 default_function_type
2964 = build_function_type (integer_type_node, NULL_TREE);
2966 ptr_type_node = build_pointer_type (void_type_node);
2968 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2970 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2973 = build_function_type (void_type_node, NULL_TREE);
2976 = build_function_type (float_type_node,
2977 tree_cons (NULL_TREE, float_type_node, endlink));
2980 = build_function_type (double_type_node,
2981 tree_cons (NULL_TREE, double_type_node, endlink));
2983 ldouble_ftype_ldouble
2984 = build_function_type (long_double_type_node,
2985 tree_cons (NULL_TREE, long_double_type_node,
2988 double_ftype_double_double
2989 = build_function_type (double_type_node,
2990 tree_cons (NULL_TREE, double_type_node,
2991 tree_cons (NULL_TREE,
2992 double_type_node, endlink)));
2995 = build_function_type (integer_type_node,
2996 tree_cons (NULL_TREE, integer_type_node, endlink));
2999 = build_function_type (long_integer_type_node,
3000 tree_cons (NULL_TREE,
3001 long_integer_type_node, endlink));
3003 void_ftype_ptr_ptr_int
3004 = build_function_type (void_type_node,
3005 tree_cons (NULL_TREE, ptr_type_node,
3006 tree_cons (NULL_TREE, ptr_type_node,
3007 tree_cons (NULL_TREE,
3011 int_ftype_cptr_cptr_sizet
3012 = build_function_type (integer_type_node,
3013 tree_cons (NULL_TREE, const_ptr_type_node,
3014 tree_cons (NULL_TREE, const_ptr_type_node,
3015 tree_cons (NULL_TREE,
3019 void_ftype_ptr_int_int
3020 = build_function_type (void_type_node,
3021 tree_cons (NULL_TREE, ptr_type_node,
3022 tree_cons (NULL_TREE, integer_type_node,
3023 tree_cons (NULL_TREE,
3027 string_ftype_ptr_ptr /* strcpy prototype */
3028 = build_function_type (string_type_node,
3029 tree_cons (NULL_TREE, string_type_node,
3030 tree_cons (NULL_TREE,
3031 const_string_type_node,
3034 int_ftype_string_string /* strcmp prototype */
3035 = build_function_type (integer_type_node,
3036 tree_cons (NULL_TREE, const_string_type_node,
3037 tree_cons (NULL_TREE,
3038 const_string_type_node,
3041 strlen_ftype /* strlen prototype */
3042 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3043 tree_cons (NULL_TREE, const_string_type_node,
3046 traditional_ptr_type_node
3047 = (flag_traditional ? string_type_node : ptr_type_node);
3049 memcpy_ftype /* memcpy prototype */
3050 = build_function_type (traditional_ptr_type_node,
3051 tree_cons (NULL_TREE, ptr_type_node,
3052 tree_cons (NULL_TREE, const_ptr_type_node,
3053 tree_cons (NULL_TREE,
3057 builtin_function ("__builtin_constant_p", int_ftype_int,
3058 BUILT_IN_CONSTANT_P, NULL_PTR);
3060 builtin_function ("__builtin_return_address",
3061 build_function_type (ptr_type_node,
3062 tree_cons (NULL_TREE,
3065 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3067 builtin_function ("__builtin_frame_address",
3068 build_function_type (ptr_type_node,
3069 tree_cons (NULL_TREE,
3072 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3074 builtin_function ("__builtin_alloca",
3075 build_function_type (ptr_type_node,
3076 tree_cons (NULL_TREE,
3079 BUILT_IN_ALLOCA, "alloca");
3080 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3081 /* Define alloca, ffs as builtins.
3082 Declare _exit just to mark it as volatile. */
3083 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3085 temp = builtin_function ("alloca",
3086 build_function_type (ptr_type_node,
3087 tree_cons (NULL_TREE,
3090 BUILT_IN_ALLOCA, NULL_PTR);
3091 /* Suppress error if redefined as a non-function. */
3092 DECL_BUILT_IN_NONANSI (temp) = 1;
3093 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3094 /* Suppress error if redefined as a non-function. */
3095 DECL_BUILT_IN_NONANSI (temp) = 1;
3096 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3098 TREE_THIS_VOLATILE (temp) = 1;
3099 TREE_SIDE_EFFECTS (temp) = 1;
3100 /* Suppress error if redefined as a non-function. */
3101 DECL_BUILT_IN_NONANSI (temp) = 1;
3104 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3105 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3107 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3109 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3111 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3113 builtin_function ("__builtin_saveregs",
3114 build_function_type (ptr_type_node, NULL_TREE),
3115 BUILT_IN_SAVEREGS, NULL_PTR);
3116 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3118 builtin_function ("__builtin_varargs",
3119 build_function_type (ptr_type_node,
3120 tree_cons (NULL_TREE,
3123 BUILT_IN_VARARGS, NULL_PTR);
3125 builtin_function ("__builtin_classify_type", default_function_type,
3126 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3127 builtin_function ("__builtin_next_arg",
3128 build_function_type (ptr_type_node, NULL_TREE),
3129 BUILT_IN_NEXT_ARG, NULL_PTR);
3130 builtin_function ("__builtin_args_info",
3131 build_function_type (integer_type_node,
3132 tree_cons (NULL_TREE,
3135 BUILT_IN_ARGS_INFO, NULL_PTR);
3137 /* Untyped call and return. */
3138 builtin_function ("__builtin_apply_args",
3139 build_function_type (ptr_type_node, NULL_TREE),
3140 BUILT_IN_APPLY_ARGS, NULL_PTR);
3142 temp = tree_cons (NULL_TREE,
3143 build_pointer_type (build_function_type (void_type_node,
3145 tree_cons (NULL_TREE,
3147 tree_cons (NULL_TREE,
3150 builtin_function ("__builtin_apply",
3151 build_function_type (ptr_type_node, temp),
3152 BUILT_IN_APPLY, NULL_PTR);
3153 builtin_function ("__builtin_return",
3154 build_function_type (void_type_node,
3155 tree_cons (NULL_TREE,
3158 BUILT_IN_RETURN, NULL_PTR);
3160 /* Currently under experimentation. */
3161 builtin_function ("__builtin_memcpy", memcpy_ftype,
3162 BUILT_IN_MEMCPY, "memcpy");
3163 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3164 BUILT_IN_MEMCMP, "memcmp");
3165 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3166 BUILT_IN_STRCMP, "strcmp");
3167 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3168 BUILT_IN_STRCPY, "strcpy");
3169 builtin_function ("__builtin_strlen", strlen_ftype,
3170 BUILT_IN_STRLEN, "strlen");
3171 builtin_function ("__builtin_sqrtf", float_ftype_float,
3172 BUILT_IN_FSQRT, "sqrtf");
3173 builtin_function ("__builtin_fsqrt", double_ftype_double,
3174 BUILT_IN_FSQRT, "sqrt");
3175 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3176 BUILT_IN_FSQRT, "sqrtl");
3177 builtin_function ("__builtin_sinf", float_ftype_float,
3178 BUILT_IN_SIN, "sinf");
3179 builtin_function ("__builtin_sin", double_ftype_double,
3180 BUILT_IN_SIN, "sin");
3181 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3182 BUILT_IN_SIN, "sinl");
3183 builtin_function ("__builtin_cosf", float_ftype_float,
3184 BUILT_IN_COS, "cosf");
3185 builtin_function ("__builtin_cos", double_ftype_double,
3186 BUILT_IN_COS, "cos");
3187 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3188 BUILT_IN_COS, "cosl");
3190 /* In an ANSI C program, it is okay to supply built-in meanings
3191 for these functions, since applications cannot validly use them
3192 with any other meaning.
3193 However, honor the -fno-builtin option. */
3194 if (!flag_no_builtin)
3196 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3197 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3198 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3199 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3201 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3202 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3203 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3205 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3207 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3209 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3210 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3211 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3212 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3214 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3215 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3216 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3217 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3218 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3219 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3221 /* Declare these functions volatile
3222 to avoid spurious "control drops through" warnings. */
3223 /* Don't specify the argument types, to avoid errors
3224 from certain code which isn't valid in ANSI but which exists. */
3225 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3227 TREE_THIS_VOLATILE (temp) = 1;
3228 TREE_SIDE_EFFECTS (temp) = 1;
3229 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3230 TREE_THIS_VOLATILE (temp) = 1;
3231 TREE_SIDE_EFFECTS (temp) = 1;
3235 /* Support for these has not been written in either expand_builtin
3236 or build_function_call. */
3237 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3238 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3239 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3241 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3243 builtin_function ("__builtin_fmod", double_ftype_double_double,
3244 BUILT_IN_FMOD, NULL_PTR);
3245 builtin_function ("__builtin_frem", double_ftype_double_double,
3246 BUILT_IN_FREM, NULL_PTR);
3247 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3248 BUILT_IN_MEMSET, NULL_PTR);
3249 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3251 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3255 pedantic_lvalues = pedantic;
3257 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3258 declare_function_name ();
3260 start_identifier_warnings ();
3262 /* Prepare to check format strings against argument lists. */
3263 init_function_format_info ();
3267 incomplete_decl_finalize_hook = finish_incomplete_decl;
3270 /* Return a definition for a builtin function named NAME and whose data type
3271 is TYPE. TYPE should be a function type with argument types.
3272 FUNCTION_CODE tells later passes how to compile calls to this function.
3273 See tree.h for its possible values.
3275 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3276 the name to be called if we can't opencode the function. */
3279 builtin_function (name, type, function_code, library_name)
3282 enum built_in_function function_code;
3285 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3286 DECL_EXTERNAL (decl) = 1;
3287 TREE_PUBLIC (decl) = 1;
3288 /* If -traditional, permit redefining a builtin function any way you like.
3289 (Though really, if the program redefines these functions,
3290 it probably won't work right unless compiled with -fno-builtin.) */
3291 if (flag_traditional && name[0] != '_')
3292 DECL_BUILT_IN_NONANSI (decl) = 1;
3294 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3295 make_decl_rtl (decl, NULL_PTR, 1);
3297 if (function_code != NOT_BUILT_IN)
3299 DECL_BUILT_IN (decl) = 1;
3300 DECL_FUNCTION_CODE (decl) = function_code;
3302 /* Warn if a function in the namespace for users
3303 is used without an occasion to consider it declared. */
3304 if (name[0] != '_' || name[1] != '_')
3305 C_DECL_ANTICIPATED (decl) = 1;
3310 /* Called when a declaration is seen that contains no names to declare.
3311 If its type is a reference to a structure, union or enum inherited
3312 from a containing scope, shadow that tag name for the current scope
3313 with a forward reference.
3314 If its type defines a new named structure or union
3315 or defines an enum, it is valid but we need not do anything here.
3316 Otherwise, it is an error. */
3319 shadow_tag (declspecs)
3322 shadow_tag_warned (declspecs, 0);
3326 shadow_tag_warned (declspecs, warned)
3329 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3335 pending_invalid_xref = 0;
3337 for (link = declspecs; link; link = TREE_CHAIN (link))
3339 register tree value = TREE_VALUE (link);
3340 register enum tree_code code = TREE_CODE (value);
3342 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3343 /* Used to test also that TYPE_SIZE (value) != 0.
3344 That caused warning for `struct foo;' at top level in the file. */
3346 register tree name = lookup_tag_reverse (value);
3353 if (warned != 1 && code != ENUMERAL_TYPE)
3354 /* Empty unnamed enum OK */
3356 pedwarn ("unnamed struct/union that defines no instances");
3362 t = lookup_tag (code, name, current_binding_level, 1);
3366 t = make_node (code);
3375 warning ("useless keyword or type name in empty declaration");
3382 error ("two types specified in one empty declaration");
3387 pedwarn ("empty declaration");
3391 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3394 groktypename (typename)
3397 if (TREE_CODE (typename) != TREE_LIST)
3399 return grokdeclarator (TREE_VALUE (typename),
3400 TREE_PURPOSE (typename),
3404 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3407 groktypename_in_parm_context (typename)
3410 if (TREE_CODE (typename) != TREE_LIST)
3412 return grokdeclarator (TREE_VALUE (typename),
3413 TREE_PURPOSE (typename),
3417 /* Decode a declarator in an ordinary declaration or data definition.
3418 This is called as soon as the type information and variable name
3419 have been parsed, before parsing the initializer if any.
3420 Here we create the ..._DECL node, fill in its type,
3421 and put it on the list of decls for the current context.
3422 The ..._DECL node is returned as the value.
3424 Exception: for arrays where the length is not specified,
3425 the type is left null, to be filled in by `finish_decl'.
3427 Function definitions do not come here; they go to start_function
3428 instead. However, external and forward declarations of functions
3429 do go through here. Structure field declarations are done by
3430 grokfield and not through here. */
3432 /* Set this to zero to debug not using the temporary obstack
3433 to parse initializers. */
3434 int debug_temp_inits = 1;
3437 start_decl (declarator, declspecs, initialized)
3438 tree declarator, declspecs;
3441 register tree decl = grokdeclarator (declarator, declspecs,
3442 NORMAL, initialized);
3444 int init_written = initialized;
3446 /* The corresponding pop_obstacks is in finish_decl. */
3447 push_obstacks_nochange ();
3450 /* Is it valid for this decl to have an initializer at all?
3451 If not, set INITIALIZED to zero, which will indirectly
3452 tell `finish_decl' to ignore the initializer once it is parsed. */
3453 switch (TREE_CODE (decl))
3456 /* typedef foo = bar means give foo the same type as bar.
3457 We haven't parsed bar yet, so `finish_decl' will fix that up.
3458 Any other case of an initialization in a TYPE_DECL is an error. */
3459 if (pedantic || list_length (declspecs) > 1)
3461 error ("typedef `%s' is initialized",
3462 IDENTIFIER_POINTER (DECL_NAME (decl)));
3468 error ("function `%s' is initialized like a variable",
3469 IDENTIFIER_POINTER (DECL_NAME (decl)));
3474 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3475 error ("parameter `%s' is initialized",
3476 IDENTIFIER_POINTER (DECL_NAME (decl)));
3481 /* Don't allow initializations for incomplete types
3482 except for arrays which might be completed by the initialization. */
3483 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3485 /* A complete type is ok if size is fixed. */
3487 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3488 || C_DECL_VARIABLE_SIZE (decl))
3490 error ("variable-sized object may not be initialized");
3494 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3496 error ("variable `%s' has initializer but incomplete type",
3497 IDENTIFIER_POINTER (DECL_NAME (decl)));
3500 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3502 error ("elements of array `%s' have incomplete type",
3503 IDENTIFIER_POINTER (DECL_NAME (decl)));
3510 #if 0 /* Seems redundant with grokdeclarator. */
3511 if (current_binding_level != global_binding_level
3512 && DECL_EXTERNAL (decl)
3513 && TREE_CODE (decl) != FUNCTION_DECL)
3514 warning ("declaration of `%s' has `extern' and is initialized",
3515 IDENTIFIER_POINTER (DECL_NAME (decl)));
3517 DECL_EXTERNAL (decl) = 0;
3518 if (current_binding_level == global_binding_level)
3519 TREE_STATIC (decl) = 1;
3521 /* Tell `pushdecl' this is an initialized decl
3522 even though we don't yet have the initializer expression.
3523 Also tell `finish_decl' it may store the real initializer. */
3524 DECL_INITIAL (decl) = error_mark_node;
3527 /* If this is a function declaration, write a record describing it to the
3528 prototypes file (if requested). */
3530 if (TREE_CODE (decl) == FUNCTION_DECL)
3531 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3533 /* Add this decl to the current binding level.
3534 TEM may equal DECL or it may be a previous decl of the same name. */
3535 tem = pushdecl (decl);
3537 /* For C and Obective-C, we by default put things in .common when
3539 DECL_COMMON (tem) = 1;
3541 /* For a local variable, define the RTL now. */
3542 if (current_binding_level != global_binding_level
3543 /* But not if this is a duplicate decl
3544 and we preserved the rtl from the previous one
3545 (which may or may not happen). */
3546 && DECL_RTL (tem) == 0)
3548 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3550 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3551 && DECL_INITIAL (tem) != 0)
3557 /* When parsing and digesting the initializer,
3558 use temporary storage. Do this even if we will ignore the value. */
3559 if (current_binding_level == global_binding_level && debug_temp_inits)
3560 temporary_allocation ();
3566 /* Finish processing of a declaration;
3567 install its initial value.
3568 If the length of an array type is not known before,
3569 it must be determined now, from the initial value, or it is an error. */
3572 finish_decl (decl, init, asmspec_tree)
3576 register tree type = TREE_TYPE (decl);
3577 int was_incomplete = (DECL_SIZE (decl) == 0);
3578 int temporary = allocation_temporary_p ();
3581 /* If a name was specified, get the string. */
3583 asmspec = TREE_STRING_POINTER (asmspec_tree);
3585 /* If `start_decl' didn't like having an initialization, ignore it now. */
3587 if (init != 0 && DECL_INITIAL (decl) == 0)
3589 /* Don't crash if parm is initialized. */
3590 if (TREE_CODE (decl) == PARM_DECL)
3593 if (ITERATOR_P (decl))
3596 error_with_decl (decl, "iterator has no initial value");
3598 init = save_expr (init);
3603 if (TREE_CODE (decl) != TYPE_DECL)
3604 store_init_value (decl, init);
3607 /* typedef foo = bar; store the type of bar as the type of foo. */
3608 TREE_TYPE (decl) = TREE_TYPE (init);
3609 DECL_INITIAL (decl) = init = 0;
3613 /* Pop back to the obstack that is current for this binding level.
3614 This is because MAXINDEX, rtl, etc. to be made below
3615 must go in the permanent obstack. But don't discard the
3616 temporary data yet. */
3618 #if 0 /* pop_obstacks was near the end; this is what was here. */
3619 if (current_binding_level == global_binding_level && temporary)
3620 end_temporary_allocation ();
3623 /* Deduce size of array from initialization, if not already known */
3625 if (TREE_CODE (type) == ARRAY_TYPE
3626 && TYPE_DOMAIN (type) == 0
3627 && TREE_CODE (decl) != TYPE_DECL)
3630 = (TREE_STATIC (decl)
3631 /* Even if pedantic, an external linkage array
3632 may have incomplete type at first. */
3633 ? pedantic && !TREE_PUBLIC (decl)
3634 : !DECL_EXTERNAL (decl));
3636 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3638 /* Get the completed type made by complete_array_type. */
3639 type = TREE_TYPE (decl);
3642 error_with_decl (decl, "initializer fails to determine size of `%s'");
3647 error_with_decl (decl, "array size missing in `%s'");
3648 /* If a `static' var's size isn't known,
3649 make it extern as well as static, so it does not get
3651 If it is not `static', then do not mark extern;
3652 finish_incomplete_decl will give it a default size
3653 and it will get allocated. */
3654 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3655 DECL_EXTERNAL (decl) = 1;
3658 /* TYPE_MAX_VALUE is always one less than the number of elements
3659 in the array, because we start counting at zero. Therefore,
3660 warn only if the value is less than zero. */
3661 if (pedantic && TYPE_DOMAIN (type) != 0
3662 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3663 error_with_decl (decl, "zero or negative size array `%s'");
3665 layout_decl (decl, 0);
3668 if (TREE_CODE (decl) == VAR_DECL)
3670 if (DECL_SIZE (decl) == 0
3671 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3672 layout_decl (decl, 0);
3674 if (DECL_SIZE (decl) == 0
3675 && (TREE_STATIC (decl)
3677 /* A static variable with an incomplete type
3678 is an error if it is initialized.
3679 Also if it is not file scope.
3680 Otherwise, let it through, but if it is not `extern'
3681 then it may cause an error message later. */
3682 /* We must use DECL_CONTEXT instead of current_binding_level,
3683 because a duplicate_decls call could have changed the binding
3684 level of this decl. */
3685 (DECL_INITIAL (decl) != 0 || DECL_CONTEXT (decl) != 0)
3687 /* An automatic variable with an incomplete type
3689 !DECL_EXTERNAL (decl)))
3691 error_with_decl (decl, "storage size of `%s' isn't known");
3692 TREE_TYPE (decl) = error_mark_node;
3695 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3696 && DECL_SIZE (decl) != 0)
3698 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3699 constant_expression_warning (DECL_SIZE (decl));
3701 error_with_decl (decl, "storage size of `%s' isn't constant");
3705 /* If this is a function and an assembler name is specified, it isn't
3706 builtin any more. Also reset DECL_RTL so we can give it its new
3708 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3710 DECL_BUILT_IN (decl) = 0;
3711 DECL_RTL (decl) = 0;
3714 /* Output the assembler code and/or RTL code for variables and functions,
3715 unless the type is an undefined structure or union.
3716 If not, it will get done when the type is completed. */
3718 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3720 if ((flag_traditional || TREE_PERMANENT (decl))
3721 && allocation_temporary_p ())
3723 push_obstacks_nochange ();
3724 end_temporary_allocation ();
3725 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3726 maybe_objc_check_decl (decl);
3727 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3733 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3734 maybe_objc_check_decl (decl);
3735 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3738 if (DECL_CONTEXT (decl) != 0)
3740 /* Recompute the RTL of a local array now
3741 if it used to be an incomplete type. */
3743 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3745 /* If we used it already as memory, it must stay in memory. */
3746 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3747 /* If it's still incomplete now, no init will save it. */
3748 if (DECL_SIZE (decl) == 0)
3749 DECL_INITIAL (decl) = 0;
3752 /* Compute and store the initial value. */
3753 if (TREE_CODE (decl) != FUNCTION_DECL)
3754 expand_decl_init (decl);
3758 if (TREE_CODE (decl) == TYPE_DECL)
3760 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3761 maybe_objc_check_decl (decl);
3762 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3766 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3767 /* This test used to include TREE_PERMANENT, however, we have the same
3768 problem with initializers at the function level. Such initializers get
3769 saved until the end of the function on the momentary_obstack. */
3770 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3772 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3773 space with DECL_ARG_TYPE. */
3774 && TREE_CODE (decl) != PARM_DECL)
3776 /* We need to remember that this array HAD an initialization,
3777 but discard the actual temporary nodes,
3778 since we can't have a permanent node keep pointing to them. */
3779 /* We make an exception for inline functions, since it's
3780 normal for a local extern redeclaration of an inline function
3781 to have a copy of the top-level decl's DECL_INLINE. */
3782 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3784 /* If this is a const variable, then preserve the
3785 initializer instead of discarding it so that we can optimize
3786 references to it. */
3787 /* This test used to include TREE_STATIC, but this won't be set
3788 for function level initializers. */
3789 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3791 preserve_initializer ();
3792 /* Hack? Set the permanent bit for something that is permanent,
3793 but not on the permenent obstack, so as to convince
3794 output_constant_def to make its rtl on the permanent
3796 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3798 /* The initializer and DECL must have the same (or equivalent
3799 types), but if the initializer is a STRING_CST, its type
3800 might not be on the right obstack, so copy the type
3802 TREE_TYPE (DECL_INITIAL (decl)) = type;
3805 DECL_INITIAL (decl) = error_mark_node;
3809 /* If requested, warn about definitions of large data objects. */
3811 if (warn_larger_than
3812 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3813 && !DECL_EXTERNAL (decl))
3815 register tree decl_size = DECL_SIZE (decl);
3817 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3819 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3821 if (units > larger_than_size)
3822 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3827 /* Resume permanent allocation, if not within a function. */
3828 /* The corresponding push_obstacks_nochange is in start_decl,
3829 and in push_parm_decl and in grokfield. */
3833 /* If we have gone back from temporary to permanent allocation,
3834 actually free the temporary space that we no longer need. */
3835 if (temporary && !allocation_temporary_p ())
3836 permanent_allocation (0);
3838 /* At the end of a declaration, throw away any variable type sizes
3839 of types defined inside that declaration. There is no use
3840 computing them in the following function definition. */
3841 if (current_binding_level == global_binding_level)
3842 get_pending_sizes ();
3845 /* If DECL has a cleanup, build and return that cleanup here.
3846 This is a callback called by expand_expr. */
3849 maybe_build_cleanup (decl)
3852 /* There are no cleanups in C. */
3856 /* Given a parsed parameter declaration,
3857 decode it into a PARM_DECL and push that on the current binding level.
3858 Also, for the sake of forward parm decls,
3859 record the given order of parms in `parm_order'. */
3862 push_parm_decl (parm)
3866 int old_immediate_size_expand = immediate_size_expand;
3867 /* Don't try computing parm sizes now -- wait till fn is called. */
3868 immediate_size_expand = 0;
3870 /* The corresponding pop_obstacks is in finish_decl. */
3871 push_obstacks_nochange ();
3873 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3876 if (DECL_NAME (decl))
3879 olddecl = lookup_name (DECL_NAME (decl));
3880 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3881 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3885 decl = pushdecl (decl);
3887 immediate_size_expand = old_immediate_size_expand;
3889 current_binding_level->parm_order
3890 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3892 /* Add this decl to the current binding level. */
3893 finish_decl (decl, NULL_TREE, NULL_TREE);
3896 /* Clear the given order of parms in `parm_order'.
3897 Used at start of parm list,
3898 and also at semicolon terminating forward decls. */
3903 current_binding_level->parm_order = NULL_TREE;
3906 /* Make TYPE a complete type based on INITIAL_VALUE.
3907 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3908 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3911 complete_array_type (type, initial_value, do_default)
3916 register tree maxindex = NULL_TREE;
3921 /* Note MAXINDEX is really the maximum index,
3922 one less than the size. */
3923 if (TREE_CODE (initial_value) == STRING_CST)
3926 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3927 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3930 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3932 tree elts = CONSTRUCTOR_ELTS (initial_value);
3933 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3934 for (; elts; elts = TREE_CHAIN (elts))
3936 if (TREE_PURPOSE (elts))
3937 maxindex = TREE_PURPOSE (elts);
3939 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3941 maxindex = copy_node (maxindex);
3945 /* Make an error message unless that happened already. */
3946 if (initial_value != error_mark_node)
3949 /* Prevent further error messages. */
3950 maxindex = build_int_2 (0, 0);
3957 maxindex = build_int_2 (0, 0);
3963 TYPE_DOMAIN (type) = build_index_type (maxindex);
3964 if (!TREE_TYPE (maxindex))
3965 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3966 #if 0 /* I took out this change
3967 together with the change in build_array_type. --rms */
3968 change_main_variant (type,
3969 build_array_type (TREE_TYPE (type),
3970 TYPE_DOMAIN (type)));
3974 /* Lay out the type now that we can get the real answer. */
3981 /* Given declspecs and a declarator,
3982 determine the name and type of the object declared
3983 and construct a ..._DECL node for it.
3984 (In one case we can return a ..._TYPE node instead.
3985 For invalid input we sometimes return 0.)
3987 DECLSPECS is a chain of tree_list nodes whose value fields
3988 are the storage classes and type specifiers.
3990 DECL_CONTEXT says which syntactic context this declaration is in:
3991 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3992 FUNCDEF for a function definition. Like NORMAL but a few different
3993 error messages in each case. Return value may be zero meaning
3994 this definition is too screwy to try to parse.
3995 PARM for a parameter declaration (either within a function prototype
3996 or before a function body). Make a PARM_DECL, or return void_type_node.
3997 TYPENAME if for a typename (in a cast or sizeof).
3998 Don't make a DECL node; just return the ..._TYPE node.
3999 FIELD for a struct or union field; make a FIELD_DECL.
4000 BITFIELD for a field with specified width.
4001 INITIALIZED is 1 if the decl has an initializer.
4003 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4004 It may also be so in the PARM case, for a prototype where the
4005 argument type is specified but not the name.
4007 This function is where the complicated C meanings of `static'
4008 and `extern' are interpreted. */
4011 grokdeclarator (declarator, declspecs, decl_context, initialized)
4014 enum decl_context decl_context;
4019 tree type = NULL_TREE;
4024 int explicit_int = 0;
4025 int explicit_char = 0;
4026 int defaulted_int = 0;
4027 tree typedef_decl = 0;
4029 tree typedef_type = 0;
4030 int funcdef_flag = 0;
4031 enum tree_code innermost_code = ERROR_MARK;
4033 int size_varies = 0;
4034 tree decl_machine_attr = NULL_TREE;
4036 if (decl_context == BITFIELD)
4037 bitfield = 1, decl_context = FIELD;
4039 if (decl_context == FUNCDEF)
4040 funcdef_flag = 1, decl_context = NORMAL;
4042 push_obstacks_nochange ();
4044 if (flag_traditional && allocation_temporary_p ())
4045 end_temporary_allocation ();
4047 /* Look inside a declarator for the name being declared
4048 and get it as a string, for an error message. */
4050 register tree decl = declarator;
4054 switch (TREE_CODE (decl))
4059 innermost_code = TREE_CODE (decl);
4060 decl = TREE_OPERAND (decl, 0);
4063 case IDENTIFIER_NODE:
4064 name = IDENTIFIER_POINTER (decl);
4075 /* A function definition's declarator must have the form of
4076 a function declarator. */
4078 if (funcdef_flag && innermost_code != CALL_EXPR)
4081 /* Anything declared one level down from the top level
4082 must be one of the parameters of a function
4083 (because the body is at least two levels down). */
4085 /* If this looks like a function definition, make it one,
4086 even if it occurs where parms are expected.
4087 Then store_parm_decls will reject it and not use it as a parm. */
4088 if (decl_context == NORMAL && !funcdef_flag
4089 && current_binding_level->level_chain == global_binding_level)
4090 decl_context = PARM;
4092 /* Look through the decl specs and record which ones appear.
4093 Some typespecs are defined as built-in typenames.
4094 Others, the ones that are modifiers of other types,
4095 are represented by bits in SPECBITS: set the bits for
4096 the modifiers that appear. Storage class keywords are also in SPECBITS.
4098 If there is a typedef name or a type, store the type in TYPE.
4099 This includes builtin typedefs such as `int'.
4101 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4102 and did not come from a user typedef.
4104 Set LONGLONG if `long' is mentioned twice. */
4106 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4109 register tree id = TREE_VALUE (spec);
4111 if (id == ridpointers[(int) RID_INT])
4113 if (id == ridpointers[(int) RID_CHAR])
4116 if (TREE_CODE (id) == IDENTIFIER_NODE)
4117 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4119 if (ridpointers[i] == id)
4121 if (i == (int) RID_LONG && specbits & (1<<i))
4124 error ("`long long long' is too long for GCC");
4127 if (pedantic && ! in_system_header)
4128 pedwarn ("ANSI C does not support `long long'");
4132 else if (specbits & (1 << i))
4133 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4139 error ("two or more data types in declaration of `%s'", name);
4140 /* Actual typedefs come to us as TYPE_DECL nodes. */
4141 else if (TREE_CODE (id) == TYPE_DECL)
4143 type = TREE_TYPE (id);
4144 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4147 /* Built-in types come as identifiers. */
4148 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4150 register tree t = lookup_name (id);
4151 if (TREE_TYPE (t) == error_mark_node)
4153 else if (!t || TREE_CODE (t) != TYPE_DECL)
4154 error ("`%s' fails to be a typedef or built in type",
4155 IDENTIFIER_POINTER (id));
4158 type = TREE_TYPE (t);
4162 else if (TREE_CODE (id) != ERROR_MARK)
4168 typedef_type = type;
4170 size_varies = C_TYPE_VARIABLE_SIZE (type);
4172 /* No type at all: default to `int', and set DEFAULTED_INT
4173 because it was not a user-defined typedef. */
4177 if (funcdef_flag && warn_return_type
4178 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4179 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
4180 warn_about_return_type = 1;
4182 type = integer_type_node;
4185 /* Now process the modifiers that were specified
4186 and check for invalid combinations. */
4188 /* Long double is a special combination. */
4190 if ((specbits & 1 << (int) RID_LONG)
4191 && TYPE_MAIN_VARIANT (type) == double_type_node)
4193 specbits &= ~ (1 << (int) RID_LONG);
4194 type = long_double_type_node;
4197 /* Check all other uses of type modifiers. */
4199 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4200 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4204 if (TREE_CODE (type) != INTEGER_TYPE)
4205 error ("long, short, signed or unsigned invalid for `%s'", name);
4206 else if ((specbits & 1 << (int) RID_LONG)
4207 && (specbits & 1 << (int) RID_SHORT))
4208 error ("long and short specified together for `%s'", name);
4209 else if (((specbits & 1 << (int) RID_LONG)
4210 || (specbits & 1 << (int) RID_SHORT))
4212 error ("long or short specified with char for `%s'", name);
4213 else if (((specbits & 1 << (int) RID_LONG)
4214 || (specbits & 1 << (int) RID_SHORT))
4215 && TREE_CODE (type) == REAL_TYPE)
4216 error ("long or short specified with floating type for `%s'", name);
4217 else if ((specbits & 1 << (int) RID_SIGNED)
4218 && (specbits & 1 << (int) RID_UNSIGNED))
4219 error ("signed and unsigned given together for `%s'", name);
4223 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4225 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4227 if (flag_pedantic_errors)
4232 /* Discard the type modifiers if they are invalid. */
4235 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4236 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4241 if ((specbits & (1 << (int) RID_COMPLEX))
4242 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4244 error ("complex invalid for `%s'", name);
4245 specbits &= ~ (1 << (int) RID_COMPLEX);
4248 /* Decide whether an integer type is signed or not.
4249 Optionally treat bitfields as signed by default. */
4250 if (specbits & 1 << (int) RID_UNSIGNED
4251 /* Traditionally, all bitfields are unsigned. */
4252 || (bitfield && flag_traditional
4253 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4254 || (bitfield && ! flag_signed_bitfields
4255 && (explicit_int || defaulted_int || explicit_char
4256 /* A typedef for plain `int' without `signed'
4257 can be controlled just like plain `int'. */
4258 || ! (typedef_decl != 0
4259 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4260 && TREE_CODE (type) != ENUMERAL_TYPE
4261 && !(specbits & 1 << (int) RID_SIGNED)))
4264 type = long_long_unsigned_type_node;
4265 else if (specbits & 1 << (int) RID_LONG)
4266 type = long_unsigned_type_node;
4267 else if (specbits & 1 << (int) RID_SHORT)
4268 type = short_unsigned_type_node;
4269 else if (type == char_type_node)
4270 type = unsigned_char_type_node;
4271 else if (typedef_decl)
4272 type = unsigned_type (type);
4274 type = unsigned_type_node;
4276 else if ((specbits & 1 << (int) RID_SIGNED)
4277 && type == char_type_node)
4278 type = signed_char_type_node;
4280 type = long_long_integer_type_node;
4281 else if (specbits & 1 << (int) RID_LONG)
4282 type = long_integer_type_node;
4283 else if (specbits & 1 << (int) RID_SHORT)
4284 type = short_integer_type_node;
4286 if (specbits & 1 << (int) RID_COMPLEX)
4288 /* If we just have "complex", it is equivalent to
4289 "complex double", but if any modifiers at all are specified it is
4290 the complex form of TYPE. E.g, "complex short" is
4291 "complex short int". */
4293 if (defaulted_int && ! longlong
4294 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4295 | (1 << (int) RID_SIGNED)
4296 | (1 << (int) RID_UNSIGNED))))
4297 type = complex_double_type_node;
4298 else if (type == integer_type_node)
4299 type = complex_integer_type_node;
4300 else if (type == float_type_node)
4301 type = complex_float_type_node;
4302 else if (type == double_type_node)
4303 type = complex_double_type_node;
4304 else if (type == long_double_type_node)
4305 type = complex_long_double_type_node;
4307 type = build_complex_type (type);
4310 /* Set CONSTP if this declaration is `const', whether by
4311 explicit specification or via a typedef.
4312 Likewise for VOLATILEP. */
4314 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4315 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4316 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4318 pedwarn ("duplicate `const'");
4320 pedwarn ("duplicate `volatile'");
4321 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4322 type = TYPE_MAIN_VARIANT (type);
4324 /* Warn if two storage classes are given. Default to `auto'. */
4329 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4330 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4331 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4332 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4333 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4334 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4336 /* Warn about storage classes that are invalid for certain
4337 kinds of declarations (parameters, typenames, etc.). */
4340 error ("multiple storage classes in declaration of `%s'", name);
4341 else if (funcdef_flag
4343 & ((1 << (int) RID_REGISTER)
4344 | (1 << (int) RID_AUTO)
4345 | (1 << (int) RID_TYPEDEF))))
4347 if (specbits & 1 << (int) RID_AUTO
4348 && (pedantic || current_binding_level == global_binding_level))
4349 pedwarn ("function definition declared `auto'");
4350 if (specbits & 1 << (int) RID_REGISTER)
4351 error ("function definition declared `register'");
4352 if (specbits & 1 << (int) RID_TYPEDEF)
4353 error ("function definition declared `typedef'");
4354 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4355 | (1 << (int) RID_AUTO));
4357 else if (decl_context != NORMAL && nclasses > 0)
4359 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4363 error ((decl_context == FIELD
4364 ? "storage class specified for structure field `%s'"
4365 : (decl_context == PARM
4366 ? "storage class specified for parameter `%s'"
4367 : "storage class specified for typename")),
4369 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4370 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4371 | (1 << (int) RID_EXTERN));
4374 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4376 /* `extern' with initialization is invalid if not at top level. */
4377 if (current_binding_level == global_binding_level)
4378 warning ("`%s' initialized and declared `extern'", name);
4380 error ("`%s' has both `extern' and initializer", name);
4382 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4383 && current_binding_level != global_binding_level)
4384 error ("nested function `%s' declared `extern'", name);
4385 else if (current_binding_level == global_binding_level
4386 && specbits & (1 << (int) RID_AUTO))
4387 error ("top-level declaration of `%s' specifies `auto'", name);
4388 else if ((specbits & 1 << (int) RID_ITERATOR)
4389 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4391 error ("iterator `%s' has derived type", name);
4392 type = error_mark_node;
4394 else if ((specbits & 1 << (int) RID_ITERATOR)
4395 && TREE_CODE (type) != INTEGER_TYPE)
4397 error ("iterator `%s' has noninteger type", name);
4398 type = error_mark_node;
4402 /* Now figure out the structure of the declarator proper.
4403 Descend through it, creating more complex types, until we reach
4404 the declared identifier (or NULL_TREE, in an absolute declarator). */
4406 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4408 if (type == error_mark_node)
4410 declarator = TREE_OPERAND (declarator, 0);
4414 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4415 an INDIRECT_REF (for *...),
4416 a CALL_EXPR (for ...(...)),
4417 an identifier (for the name being declared)
4418 or a null pointer (for the place in an absolute declarator
4419 where the name was omitted).
4420 For the last two cases, we have just exited the loop.
4422 At this point, TYPE is the type of elements of an array,
4423 or for a function to return, or for a pointer to point to.
4424 After this sequence of ifs, TYPE is the type of the
4425 array or function or pointer, and DECLARATOR has had its
4426 outermost layer removed. */
4428 if (TREE_CODE (declarator) == ARRAY_REF)
4430 register tree itype = NULL_TREE;
4431 register tree size = TREE_OPERAND (declarator, 1);
4432 /* An uninitialized decl with `extern' is a reference. */
4433 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4434 /* The index is a signed object `sizetype' bits wide. */
4435 tree index_type = signed_type (sizetype);
4437 declarator = TREE_OPERAND (declarator, 0);
4439 /* Check for some types that there cannot be arrays of. */
4441 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4443 error ("declaration of `%s' as array of voids", name);
4444 type = error_mark_node;
4447 if (TREE_CODE (type) == FUNCTION_TYPE)
4449 error ("declaration of `%s' as array of functions", name);
4450 type = error_mark_node;
4453 if (size == error_mark_node)
4454 type = error_mark_node;
4456 if (type == error_mark_node)
4459 /* If this is a block level extern, it must live past the end
4460 of the function so that we can check it against other extern
4461 declarations (IDENTIFIER_LIMBO_VALUE). */
4462 if (extern_ref && allocation_temporary_p ())
4463 end_temporary_allocation ();
4465 /* If size was specified, set ITYPE to a range-type for that size.
4466 Otherwise, ITYPE remains null. finish_decl may figure it out
4467 from an initial value. */
4471 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4472 STRIP_TYPE_NOPS (size);
4474 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4475 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4477 error ("size of array `%s' has non-integer type", name);
4478 size = integer_one_node;
4481 if (pedantic && integer_zerop (size))
4482 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4484 if (TREE_CODE (size) == INTEGER_CST)
4486 constant_expression_warning (size);
4487 if (tree_int_cst_sgn (size) < 0)
4489 error ("size of array `%s' is negative", name);
4490 size = integer_one_node;
4495 /* Make sure the array size remains visibly nonconstant
4496 even if it is (eg) a const variable with known value. */
4501 if (TREE_CONSTANT (size))
4502 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4504 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4508 /* Convert size to index_type, so that if it is a variable
4509 the computations will be done in the proper mode. */
4510 itype = fold (build (MINUS_EXPR, index_type,
4511 convert (index_type, size),
4512 convert (index_type, size_one_node)));
4515 itype = variable_size (itype);
4516 itype = build_index_type (itype);
4519 #if 0 /* This had bad results for pointers to arrays, as in
4520 union incomplete (*foo)[4]; */
4521 /* Complain about arrays of incomplete types, except in typedefs. */
4523 if (TYPE_SIZE (type) == 0
4524 /* Avoid multiple warnings for nested array types. */
4525 && TREE_CODE (type) != ARRAY_TYPE
4526 && !(specbits & (1 << (int) RID_TYPEDEF))
4527 && !C_TYPE_BEING_DEFINED (type))
4528 warning ("array type has incomplete element type");
4531 #if 0 /* We shouldn't have a function type here at all!
4532 Functions aren't allowed as array elements. */
4533 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4534 && (constp || volatilep))
4535 pedwarn ("ANSI C forbids const or volatile function types");
4538 /* Build the array type itself, then merge any constancy or
4539 volatility into the target type. We must do it in this order
4540 to ensure that the TYPE_MAIN_VARIANT field of the array type
4541 is set correctly. */
4543 type = build_array_type (type, itype);
4544 if (constp || volatilep)
4545 type = c_build_type_variant (type, constp, volatilep);
4547 #if 0 /* don't clear these; leave them set so that the array type
4548 or the variable is itself const or volatile. */
4554 C_TYPE_VARIABLE_SIZE (type) = 1;
4556 else if (TREE_CODE (declarator) == CALL_EXPR)
4558 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4559 || current_binding_level == global_binding_level);
4562 /* Declaring a function type.
4563 Make sure we have a valid type for the function to return. */
4564 if (type == error_mark_node)
4569 /* Warn about some types functions can't return. */
4571 if (TREE_CODE (type) == FUNCTION_TYPE)
4573 error ("`%s' declared as function returning a function", name);
4574 type = integer_type_node;
4576 if (TREE_CODE (type) == ARRAY_TYPE)
4578 error ("`%s' declared as function returning an array", name);
4579 type = integer_type_node;
4582 #ifndef TRADITIONAL_RETURN_FLOAT
4583 /* Traditionally, declaring return type float means double. */
4585 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4586 type = double_type_node;
4587 #endif /* TRADITIONAL_RETURN_FLOAT */
4589 /* If this is a block level extern, it must live past the end
4590 of the function so that we can check it against other extern
4591 declarations (IDENTIFIER_LIMBO_VALUE). */
4592 if (extern_ref && allocation_temporary_p ())
4593 end_temporary_allocation ();
4595 /* Construct the function type and go to the next
4596 inner layer of declarator. */
4598 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4600 /* Say it's a definition
4601 only for the CALL_EXPR
4602 closest to the identifier. */
4603 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4604 #if 0 /* This seems to be false. We turn off temporary allocation
4605 above in this function if -traditional.
4606 And this code caused inconsistent results with prototypes:
4607 callers would ignore them, and pass arguments wrong. */
4609 /* Omit the arg types if -traditional, since the arg types
4610 and the list links might not be permanent. */
4611 type = build_function_type (type,
4613 ? NULL_TREE : arg_types);
4615 /* ANSI seems to say that `const int foo ();'
4616 does not make the function foo const. */
4617 if (constp || volatilep)
4618 type = c_build_type_variant (type, constp, volatilep);
4622 type = build_function_type (type, arg_types);
4623 declarator = TREE_OPERAND (declarator, 0);
4625 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4626 the formal parameter list of this FUNCTION_TYPE to point to
4627 the FUNCTION_TYPE node itself. */
4632 for (link = current_function_parm_tags;
4634 link = TREE_CHAIN (link))
4635 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4638 else if (TREE_CODE (declarator) == INDIRECT_REF)
4640 /* Merge any constancy or volatility into the target type
4643 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4644 && (constp || volatilep))
4645 pedwarn ("ANSI C forbids const or volatile function types");
4646 if (constp || volatilep)
4647 type = c_build_type_variant (type, constp, volatilep);
4652 type = build_pointer_type (type);
4654 /* Process a list of type modifier keywords
4655 (such as const or volatile) that were given inside the `*'. */
4657 if (TREE_TYPE (declarator))
4659 register tree typemodlist;
4661 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4662 typemodlist = TREE_CHAIN (typemodlist))
4664 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4666 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4671 error ("invalid type modifier within pointer declarator");
4675 pedwarn ("duplicate `const'");
4677 pedwarn ("duplicate `volatile'");
4680 declarator = TREE_OPERAND (declarator, 0);
4687 /* Now TYPE has the actual type. */
4689 /* If this is declaring a typedef name, return a TYPE_DECL. */
4691 if (specbits & (1 << (int) RID_TYPEDEF))
4694 /* Note that the grammar rejects storage classes
4695 in typenames, fields or parameters */
4696 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4697 && (constp || volatilep))
4698 pedwarn ("ANSI C forbids const or volatile function types");
4699 if (constp || volatilep)
4700 type = c_build_type_variant (type, constp, volatilep);
4702 decl = build_decl (TYPE_DECL, declarator, type);
4703 if ((specbits & (1 << (int) RID_SIGNED))
4704 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4705 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4709 /* Detect the case of an array type of unspecified size
4710 which came, as such, direct from a typedef name.
4711 We must copy the type, so that each identifier gets
4712 a distinct type, so that each identifier's size can be
4713 controlled separately by its own initializer. */
4715 if (type != 0 && typedef_type != 0
4716 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4717 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4719 type = build_array_type (TREE_TYPE (type), 0);
4721 C_TYPE_VARIABLE_SIZE (type) = 1;
4724 /* If this is a type name (such as, in a cast or sizeof),
4725 compute the type and return it now. */
4727 if (decl_context == TYPENAME)
4729 /* Note that the grammar rejects storage classes
4730 in typenames, fields or parameters */
4731 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4732 && (constp || volatilep))
4733 pedwarn ("ANSI C forbids const or volatile function types");
4734 if (constp || volatilep)
4735 type = c_build_type_variant (type, constp, volatilep);
4740 /* Aside from typedefs and type names (handle above),
4741 `void' at top level (not within pointer)
4742 is allowed only in public variables.
4743 We don't complain about parms either, but that is because
4744 a better error message can be made later. */
4746 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4747 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4748 && ((specbits & (1 << (int) RID_EXTERN))
4749 || (current_binding_level == global_binding_level
4751 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4753 error ("variable or field `%s' declared void", name);
4754 type = integer_type_node;
4757 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4758 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4763 if (decl_context == PARM)
4765 tree type_as_written = type;
4768 /* A parameter declared as an array of T is really a pointer to T.
4769 One declared as a function is really a pointer to a function. */
4771 if (TREE_CODE (type) == ARRAY_TYPE)
4773 /* Transfer const-ness of array into that of type pointed to. */
4774 type = TREE_TYPE (type);
4775 if (constp || volatilep)
4776 type = c_build_type_variant (type, constp, volatilep);
4777 type = build_pointer_type (type);
4778 volatilep = constp = 0;
4781 else if (TREE_CODE (type) == FUNCTION_TYPE)
4783 if (pedantic && (constp || volatilep))
4784 pedwarn ("ANSI C forbids const or volatile function types");
4785 if (constp || volatilep)
4786 type = c_build_type_variant (type, constp, volatilep);
4787 type = build_pointer_type (type);
4788 volatilep = constp = 0;
4791 decl = build_decl (PARM_DECL, declarator, type);
4793 C_DECL_VARIABLE_SIZE (decl) = 1;
4795 /* Compute the type actually passed in the parmlist,
4796 for the case where there is no prototype.
4797 (For example, shorts and chars are passed as ints.)
4798 When there is a prototype, this is overridden later. */
4800 DECL_ARG_TYPE (decl) = type;
4801 main_type = (type == error_mark_node
4803 : TYPE_MAIN_VARIANT (type));
4804 if (main_type == float_type_node)
4805 DECL_ARG_TYPE (decl) = double_type_node;
4806 /* Don't use TYPE_PRECISION to decide whether to promote,
4807 because we should convert short if it's the same size as int,
4808 but we should not convert long if it's the same size as int. */
4809 else if (TREE_CODE (main_type) != ERROR_MARK
4810 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4812 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4813 && TREE_UNSIGNED (type))
4814 DECL_ARG_TYPE (decl) = unsigned_type_node;
4816 DECL_ARG_TYPE (decl) = integer_type_node;
4819 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4821 else if (decl_context == FIELD)
4823 /* Structure field. It may not be a function. */
4825 if (TREE_CODE (type) == FUNCTION_TYPE)
4827 error ("field `%s' declared as a function", name);
4828 type = build_pointer_type (type);
4830 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4832 error ("field `%s' has incomplete type", name);
4833 type = error_mark_node;
4835 /* Move type qualifiers down to element of an array. */
4836 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4838 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4840 TYPE_DOMAIN (type));
4841 #if 0 /* Leave the field const or volatile as well. */
4842 constp = volatilep = 0;
4845 decl = build_decl (FIELD_DECL, declarator, type);
4847 C_DECL_VARIABLE_SIZE (decl) = 1;
4849 else if (TREE_CODE (type) == FUNCTION_TYPE)
4851 /* Every function declaration is "external"
4852 except for those which are inside a function body
4853 in which `auto' is used.
4854 That is a case not specified by ANSI C,
4855 and we use it for forward declarations for nested functions. */
4856 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4857 || current_binding_level == global_binding_level);
4859 if (specbits & (1 << (int) RID_AUTO)
4860 && (pedantic || current_binding_level == global_binding_level))
4861 pedwarn ("invalid storage class for function `%s'", name);
4862 if (specbits & (1 << (int) RID_REGISTER))
4863 error ("invalid storage class for function `%s'", name);
4864 /* Function declaration not at top level.
4865 Storage classes other than `extern' are not allowed
4866 and `extern' makes no difference. */
4867 if (current_binding_level != global_binding_level
4868 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4870 pedwarn ("invalid storage class for function `%s'", name);
4872 /* If this is a block level extern, it must live past the end
4873 of the function so that we can check it against other
4874 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4875 if (extern_ref && allocation_temporary_p ())
4876 end_temporary_allocation ();
4878 decl = build_decl (FUNCTION_DECL, declarator, type);
4879 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4881 if (pedantic && (constp || volatilep)
4882 && ! DECL_IN_SYSTEM_HEADER (decl))
4883 pedwarn ("ANSI C forbids const or volatile functions");
4886 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4887 warning ("`noreturn' function returns non-void value");
4890 DECL_EXTERNAL (decl) = 1;
4891 /* Record absence of global scope for `static' or `auto'. */
4893 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4895 /* Record presence of `inline', if it is reasonable. */
4898 tree last = tree_last (TYPE_ARG_TYPES (type));
4900 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4901 warning ("cannot inline function `main'");
4902 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4904 warning ("inline declaration ignored for function with `...'");
4906 /* Assume that otherwise the function can be inlined. */
4907 DECL_INLINE (decl) = 1;
4909 if (specbits & (1 << (int) RID_EXTERN))
4910 current_extern_inline = 1;
4915 /* It's a variable. */
4916 /* An uninitialized decl with `extern' is a reference. */
4917 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4919 /* Move type qualifiers down to element of an array. */
4920 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4922 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4924 TYPE_DOMAIN (type));
4925 #if 0 /* Leave the variable const or volatile as well. */
4926 constp = volatilep = 0;
4930 /* If this is a block level extern, it must live past the end
4931 of the function so that we can check it against other
4932 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4933 if (extern_ref && allocation_temporary_p ())
4934 end_temporary_allocation ();
4936 decl = build_decl (VAR_DECL, declarator, type);
4938 C_DECL_VARIABLE_SIZE (decl) = 1;
4941 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4943 DECL_EXTERNAL (decl) = extern_ref;
4944 /* At top level, the presence of a `static' or `register' storage
4945 class specifier, or the absence of all storage class specifiers
4946 makes this declaration a definition (perhaps tentative). Also,
4947 the absence of both `static' and `register' makes it public. */
4948 if (current_binding_level == global_binding_level)
4952 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4953 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4955 /* Not at top level, only `static' makes a static definition. */
4958 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4959 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4962 if (specbits & 1 << (int) RID_ITERATOR)
4963 ITERATOR_P (decl) = 1;
4966 /* Record `register' declaration for warnings on &
4967 and in case doing stupid register allocation. */
4969 if (specbits & (1 << (int) RID_REGISTER))
4970 DECL_REGISTER (decl) = 1;
4972 /* Record constancy and volatility. */
4975 TREE_READONLY (decl) = 1;
4978 TREE_SIDE_EFFECTS (decl) = 1;
4979 TREE_THIS_VOLATILE (decl) = 1;
4981 /* If a type has volatile components, it should be stored in memory.
4982 Otherwise, the fact that those components are volatile
4983 will be ignored, and would even crash the compiler. */
4984 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4985 mark_addressable (decl);
4993 /* Decode the parameter-list info for a function type or function definition.
4994 The argument is the value returned by `get_parm_info' (or made in parse.y
4995 if there is an identifier list instead of a parameter decl list).
4996 These two functions are separate because when a function returns
4997 or receives functions then each is called multiple times but the order
4998 of calls is different. The last call to `grokparms' is always the one
4999 that contains the formal parameter names of a function definition.
5001 Store in `last_function_parms' a chain of the decls of parms.
5002 Also store in `last_function_parm_tags' a chain of the struct, union,
5003 and enum tags declared among the parms.
5005 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5007 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5008 a mere declaration. A nonempty identifier-list gets an error message
5009 when FUNCDEF_FLAG is zero. */
5012 grokparms (parms_info, funcdef_flag)
5016 tree first_parm = TREE_CHAIN (parms_info);
5018 last_function_parms = TREE_PURPOSE (parms_info);
5019 last_function_parm_tags = TREE_VALUE (parms_info);
5021 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5022 && !in_system_header)
5023 warning ("function declaration isn't a prototype");
5026 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5029 pedwarn ("parameter names (without types) in function declaration");
5031 last_function_parms = first_parm;
5038 /* We no longer test FUNCDEF_FLAG.
5039 If the arg types are incomplete in a declaration,
5040 they must include undefined tags.
5041 These tags can never be defined in the scope of the declaration,
5042 so the types can never be completed,
5043 and no call can be compiled successfully. */
5045 /* In a fcn definition, arg types must be complete. */
5048 for (parm = last_function_parms, typelt = first_parm;
5050 parm = TREE_CHAIN (parm))
5051 /* Skip over any enumeration constants declared here. */
5052 if (TREE_CODE (parm) == PARM_DECL)
5054 /* Barf if the parameter itself has an incomplete type. */
5055 tree type = TREE_VALUE (typelt);
5056 if (TYPE_SIZE (type) == 0)
5058 if (funcdef_flag && DECL_NAME (parm) != 0)
5059 error ("parameter `%s' has incomplete type",
5060 IDENTIFIER_POINTER (DECL_NAME (parm)));
5062 warning ("parameter has incomplete type");
5065 TREE_VALUE (typelt) = error_mark_node;
5066 TREE_TYPE (parm) = error_mark_node;
5069 #if 0 /* This has been replaced by parm_tags_warning
5070 which uses a more accurate criterion for what to warn about. */
5073 /* Now warn if is a pointer to an incomplete type. */
5074 while (TREE_CODE (type) == POINTER_TYPE
5075 || TREE_CODE (type) == REFERENCE_TYPE)
5076 type = TREE_TYPE (type);
5077 type = TYPE_MAIN_VARIANT (type);
5078 if (TYPE_SIZE (type) == 0)
5080 if (DECL_NAME (parm) != 0)
5081 warning ("parameter `%s' points to incomplete type",
5082 IDENTIFIER_POINTER (DECL_NAME (parm)));
5084 warning ("parameter points to incomplete type");
5088 typelt = TREE_CHAIN (typelt);
5091 /* Allocate the list of types the way we allocate a type. */
5092 if (first_parm && ! TREE_PERMANENT (first_parm))
5094 /* Construct a copy of the list of types
5095 on the saveable obstack. */
5097 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5098 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5100 return nreverse (result);
5103 /* The list we have is permanent already. */
5109 /* Return a tree_list node with info on a parameter list just parsed.
5110 The TREE_PURPOSE is a chain of decls of those parms.
5111 The TREE_VALUE is a list of structure, union and enum tags defined.
5112 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5113 This tree_list node is later fed to `grokparms'.
5115 VOID_AT_END nonzero means append `void' to the end of the type-list.
5116 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5119 get_parm_info (void_at_end)
5122 register tree decl, t;
5123 register tree types = 0;
5125 tree tags = gettags ();
5126 tree parms = getdecls ();
5128 tree order = current_binding_level->parm_order;
5130 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5131 if (void_at_end && parms != 0
5132 && TREE_CHAIN (parms) == 0
5133 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5134 && DECL_NAME (parms) == 0)
5137 storedecls (NULL_TREE);
5138 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5139 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5142 /* Extract enumerator values and other non-parms declared with the parms.
5143 Likewise any forward parm decls that didn't have real parm decls. */
5144 for (decl = parms; decl; )
5146 tree next = TREE_CHAIN (decl);
5148 if (TREE_CODE (decl) != PARM_DECL)
5150 TREE_CHAIN (decl) = new_parms;
5153 else if (TREE_ASM_WRITTEN (decl))
5155 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5156 TREE_CHAIN (decl) = new_parms;
5162 /* Put the parm decls back in the order they were in in the parm list. */
5163 for (t = order; t; t = TREE_CHAIN (t))
5166 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5168 TREE_CHAIN (TREE_VALUE (t)) = 0;
5171 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5174 /* Store the parmlist in the binding level since the old one
5175 is no longer a valid list. (We have changed the chain pointers.) */
5176 storedecls (new_parms);
5178 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5179 /* There may also be declarations for enumerators if an enumeration
5180 type is declared among the parms. Ignore them here. */
5181 if (TREE_CODE (decl) == PARM_DECL)
5183 /* Since there is a prototype,
5184 args are passed in their declared types. */
5185 tree type = TREE_TYPE (decl);
5186 DECL_ARG_TYPE (decl) = type;
5187 #ifdef PROMOTE_PROTOTYPES
5188 if ((TREE_CODE (type) == INTEGER_TYPE
5189 || TREE_CODE (type) == ENUMERAL_TYPE)
5190 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5191 DECL_ARG_TYPE (decl) = integer_type_node;
5194 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5195 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5196 && DECL_NAME (decl) == 0)
5198 error ("`void' in parameter list must be the entire list");
5204 return saveable_tree_cons (new_parms, tags,
5205 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5207 return saveable_tree_cons (new_parms, tags, nreverse (types));
5210 /* At end of parameter list, warn about any struct, union or enum tags
5211 defined within. Do so because these types cannot ever become complete. */
5214 parmlist_tags_warning ()
5219 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5221 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5222 /* An anonymous union parm type is meaningful as a GNU extension.
5223 So don't warn for that. */
5224 if (code == UNION_TYPE && !pedantic)
5226 if (TREE_PURPOSE (elt) != 0)
5227 warning ("`%s %s' declared inside parameter list",
5228 (code == RECORD_TYPE ? "struct"
5229 : code == UNION_TYPE ? "union"
5231 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5233 warning ("anonymous %s declared inside parameter list",
5234 (code == RECORD_TYPE ? "struct"
5235 : code == UNION_TYPE ? "union"
5240 warning ("its scope is only this definition or declaration,");
5241 warning ("which is probably not what you want.");
5247 /* Get the struct, enum or union (CODE says which) with tag NAME.
5248 Define the tag as a forward-reference if it is not defined. */
5251 xref_tag (code, name)
5252 enum tree_code code;
5255 int temporary = allocation_temporary_p ();
5257 /* If a cross reference is requested, look up the type
5258 already defined for this tag and return it. */
5260 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5261 /* Even if this is the wrong type of tag, return what we found.
5262 There will be an error message anyway, from pending_xref_error.
5263 If we create an empty xref just for an invalid use of the type,
5264 the main result is to create lots of superfluous error messages. */
5268 push_obstacks_nochange ();
5270 if (current_binding_level == global_binding_level && temporary)
5271 end_temporary_allocation ();
5273 /* If no such tag is yet defined, create a forward-reference node
5274 and record it as the "definition".
5275 When a real declaration of this type is found,
5276 the forward-reference will be altered into a real type. */
5278 ref = make_node (code);
5279 if (code == ENUMERAL_TYPE)
5281 /* (In ANSI, Enums can be referred to only if already defined.) */
5283 pedwarn ("ANSI C forbids forward references to `enum' types");
5284 /* Give the type a default layout like unsigned int
5285 to avoid crashing if it does not get defined. */
5286 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5287 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5288 TREE_UNSIGNED (ref) = 1;
5289 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5290 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5291 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5294 pushtag (name, ref);
5301 /* Make sure that the tag NAME is defined *in the current binding level*
5302 at least as a forward reference.
5303 CODE says which kind of tag NAME ought to be.
5305 We also do a push_obstacks_nochange
5306 whose matching pop is in finish_struct. */
5309 start_struct (code, name)
5310 enum tree_code code;
5313 /* If there is already a tag defined at this binding level
5314 (as a forward reference), just return it. */
5316 register tree ref = 0;
5318 push_obstacks_nochange ();
5319 if (current_binding_level == global_binding_level)
5320 end_temporary_allocation ();
5323 ref = lookup_tag (code, name, current_binding_level, 1);
5324 if (ref && TREE_CODE (ref) == code)
5326 C_TYPE_BEING_DEFINED (ref) = 1;
5327 if (TYPE_FIELDS (ref))
5328 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5329 : "redefinition of `struct %s'"),
5330 IDENTIFIER_POINTER (name));
5335 /* Otherwise create a forward-reference just so the tag is in scope. */
5337 ref = make_node (code);
5338 pushtag (name, ref);
5339 C_TYPE_BEING_DEFINED (ref) = 1;
5343 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5344 of a structure component, returning a FIELD_DECL node.
5345 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5347 This is done during the parsing of the struct declaration.
5348 The FIELD_DECL nodes are chained together and the lot of them
5349 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5352 grokfield (filename, line, declarator, declspecs, width)
5355 tree declarator, declspecs, width;
5359 /* The corresponding pop_obstacks is in finish_decl. */
5360 push_obstacks_nochange ();
5362 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5364 finish_decl (value, NULL_TREE, NULL_TREE);
5365 DECL_INITIAL (value) = width;
5367 maybe_objc_check_decl (value);
5371 /* Function to help qsort sort FIELD_DECLs by name order. */
5374 field_decl_cmp (x, y)
5377 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
5380 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5381 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5383 We also do a pop_obstacks to match the push in start_struct. */
5386 finish_struct (t, fieldlist)
5387 register tree t, fieldlist;
5391 int toplevel = global_binding_level == current_binding_level;
5393 /* If this type was previously laid out as a forward reference,
5394 make sure we lay it out again. */
5398 /* Nameless union parm types are useful as GCC extension. */
5399 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5400 /* Otherwise, warn about any struct or union def. in parmlist. */
5401 if (in_parm_level_p ())
5404 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5405 : "structure defined inside parms"));
5406 else if (! flag_traditional)
5407 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5408 : "structure defined inside parms"));
5411 old_momentary = suspend_momentary ();
5413 if (fieldlist == 0 && pedantic)
5414 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5415 : "structure has no members"));
5417 /* Install struct as DECL_CONTEXT of each field decl.
5418 Also process specified field sizes.
5419 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5420 The specified size is found in the DECL_INITIAL.
5421 Store 0 there, except for ": 0" fields (so we can find them
5422 and delete them, below). */
5424 for (x = fieldlist; x; x = TREE_CHAIN (x))
5426 DECL_CONTEXT (x) = t;
5427 DECL_FIELD_SIZE (x) = 0;
5429 /* If any field is const, the structure type is pseudo-const. */
5430 if (TREE_READONLY (x))
5431 C_TYPE_FIELDS_READONLY (t) = 1;
5434 /* A field that is pseudo-const makes the structure likewise. */
5435 tree t1 = TREE_TYPE (x);
5436 while (TREE_CODE (t1) == ARRAY_TYPE)
5437 t1 = TREE_TYPE (t1);
5438 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5439 && C_TYPE_FIELDS_READONLY (t1))
5440 C_TYPE_FIELDS_READONLY (t) = 1;
5443 /* Any field that is volatile means variables of this type must be
5444 treated in some ways as volatile. */
5445 if (TREE_THIS_VOLATILE (x))
5446 C_TYPE_FIELDS_VOLATILE (t) = 1;
5448 /* Any field of nominal variable size implies structure is too. */
5449 if (C_DECL_VARIABLE_SIZE (x))
5450 C_TYPE_VARIABLE_SIZE (t) = 1;
5452 /* Detect invalid nested redefinition. */
5453 if (TREE_TYPE (x) == t)
5454 error ("nested redefinition of `%s'",
5455 IDENTIFIER_POINTER (TYPE_NAME (t)));
5457 /* Detect invalid bit-field size. */
5458 if (DECL_INITIAL (x))
5459 STRIP_NOPS (DECL_INITIAL (x));
5460 if (DECL_INITIAL (x))
5462 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5463 constant_expression_warning (DECL_INITIAL (x));
5466 error_with_decl (x, "bit-field `%s' width not an integer constant");
5467 DECL_INITIAL (x) = NULL;
5471 /* Detect invalid bit-field type. */
5472 if (DECL_INITIAL (x)
5473 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5474 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5476 error_with_decl (x, "bit-field `%s' has invalid type");
5477 DECL_INITIAL (x) = NULL;
5479 if (DECL_INITIAL (x) && pedantic
5480 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5481 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5482 /* Accept an enum that's equivalent to int or unsigned int. */
5483 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5484 && (TYPE_PRECISION (TREE_TYPE (x))
5485 == TYPE_PRECISION (integer_type_node))))
5486 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5488 /* Detect and ignore out of range field width. */
5489 if (DECL_INITIAL (x))
5491 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5493 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5495 DECL_INITIAL (x) = NULL;
5496 error_with_decl (x, "negative width in bit-field `%s'");
5498 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5499 || width > TYPE_PRECISION (TREE_TYPE (x)))
5501 DECL_INITIAL (x) = NULL;
5502 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5504 else if (width == 0 && DECL_NAME (x) != 0)
5506 error_with_decl (x, "zero width for bit-field `%s'");
5507 DECL_INITIAL (x) = NULL;
5511 /* Process valid field width. */
5512 if (DECL_INITIAL (x))
5514 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5516 DECL_FIELD_SIZE (x) = width;
5517 DECL_BIT_FIELD (x) = 1;
5518 DECL_INITIAL (x) = NULL;
5522 /* field size 0 => force desired amount of alignment. */
5523 #ifdef EMPTY_FIELD_BOUNDARY
5524 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5526 #ifdef PCC_BITFIELD_TYPE_MATTERS
5527 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5528 TYPE_ALIGN (TREE_TYPE (x)));
5532 else if (TREE_TYPE (x) != error_mark_node)
5534 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5535 : TYPE_ALIGN (TREE_TYPE (x)));
5536 /* Non-bit-fields are aligned for their type, except packed
5537 fields which require only BITS_PER_UNIT alignment. */
5538 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5542 /* Now DECL_INITIAL is null on all members. */
5544 /* Delete all duplicate fields from the fieldlist */
5545 for (x = fieldlist; x && TREE_CHAIN (x);)
5546 /* Anonymous fields aren't duplicates. */
5547 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5551 register tree y = fieldlist;
5555 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5561 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5563 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5564 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5566 else x = TREE_CHAIN (x);
5569 /* Now we have the nearly final fieldlist. Record it,
5570 then lay out the structure or union (including the fields). */
5572 TYPE_FIELDS (t) = fieldlist;
5576 /* Delete all zero-width bit-fields from the front of the fieldlist */
5578 && DECL_INITIAL (fieldlist))
5579 fieldlist = TREE_CHAIN (fieldlist);
5580 /* Delete all such members from the rest of the fieldlist */
5581 for (x = fieldlist; x;)
5583 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5584 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5585 else x = TREE_CHAIN (x);
5588 /* Now we have the truly final field list.
5589 Store it in this type and in the variants. */
5591 TYPE_FIELDS (t) = fieldlist;
5593 /* If there are lots of fields, sort so we can look through them fast.
5594 We arbitrarily consider 16 or more elts to be "a lot". */
5598 for (x = fieldlist; x; x = TREE_CHAIN (x))
5609 len += list_length (x);
5610 /* Use the same allocation policy here that make_node uses, to
5611 ensure that this lives as long as the rest of the struct decl.
5612 All decls in an inline function need to be saved. */
5613 if (allocation_temporary_p ())
5614 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5616 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5618 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5619 TYPE_LANG_SPECIFIC (t)->len = len;
5621 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5623 for (x = fieldlist; x; x = TREE_CHAIN (x))
5624 field_array[len++] = x;
5626 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5630 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5632 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5633 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5634 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5637 /* Promote each bit-field's type to int if it is narrower than that. */
5638 for (x = fieldlist; x; x = TREE_CHAIN (x))
5639 if (DECL_BIT_FIELD (x)
5640 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
5641 || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
5643 tree type = TREE_TYPE (x);
5645 /* Preserve unsignedness if traditional
5646 or if not really getting any wider. */
5647 if (TREE_UNSIGNED (type)
5648 && (flag_traditional
5650 (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5652 DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
5653 TREE_TYPE (x) = unsigned_type_node;
5655 TREE_TYPE (x) = integer_type_node;
5658 /* If this structure or union completes the type of any previous
5659 variable declaration, lay it out and output its rtl. */
5661 if (current_binding_level->n_incomplete != 0)
5664 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5666 if (TREE_TYPE (decl) == t
5667 && TREE_CODE (decl) != TYPE_DECL)
5669 layout_decl (decl, 0);
5670 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5671 maybe_objc_check_decl (decl);
5672 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5675 --current_binding_level->n_incomplete;
5677 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5678 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5680 tree element = TREE_TYPE (decl);
5681 while (TREE_CODE (element) == ARRAY_TYPE)
5682 element = TREE_TYPE (element);
5684 layout_array_type (TREE_TYPE (decl));
5689 resume_momentary (old_momentary);
5691 /* Finish debugging output for this type. */
5692 rest_of_type_compilation (t, toplevel);
5694 /* The matching push is in start_struct. */
5700 /* Lay out the type T, and its element type, and so on. */
5703 layout_array_type (t)
5706 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5707 layout_array_type (TREE_TYPE (t));
5711 /* Begin compiling the definition of an enumeration type.
5712 NAME is its name (or null if anonymous).
5713 Returns the type object, as yet incomplete.
5714 Also records info about it so that build_enumerator
5715 may be used to declare the individual values as they are read. */
5721 register tree enumtype = 0;
5723 /* If this is the real definition for a previous forward reference,
5724 fill in the contents in the same object that used to be the
5725 forward reference. */
5728 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5730 /* The corresponding pop_obstacks is in finish_enum. */
5731 push_obstacks_nochange ();
5732 /* If these symbols and types are global, make them permanent. */
5733 if (current_binding_level == global_binding_level)
5734 end_temporary_allocation ();
5736 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5738 enumtype = make_node (ENUMERAL_TYPE);
5739 pushtag (name, enumtype);
5742 C_TYPE_BEING_DEFINED (enumtype) = 1;
5744 if (TYPE_VALUES (enumtype) != 0)
5746 /* This enum is a named one that has been declared already. */
5747 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5749 /* Completely replace its old definition.
5750 The old enumerators remain defined, however. */
5751 TYPE_VALUES (enumtype) = 0;
5754 enum_next_value = integer_zero_node;
5760 /* After processing and defining all the values of an enumeration type,
5761 install their decls in the enumeration type and finish it off.
5762 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5763 Returns ENUMTYPE. */
5766 finish_enum (enumtype, values)
5767 register tree enumtype, values;
5769 register tree pair, tem;
5770 tree minnode = 0, maxnode = 0;
5771 int lowprec, highprec, precision;
5772 int toplevel = global_binding_level == current_binding_level;
5774 if (in_parm_level_p ())
5775 warning ("enum defined inside parms");
5777 /* Calculate the maximum value of any enumerator in this type. */
5779 if (values == error_mark_node)
5780 minnode = maxnode = integer_zero_node;
5782 for (pair = values; pair; pair = TREE_CHAIN (pair))
5784 tree value = TREE_VALUE (pair);
5786 minnode = maxnode = TREE_VALUE (pair);
5789 if (tree_int_cst_lt (maxnode, value))
5791 if (tree_int_cst_lt (value, minnode))
5796 TYPE_MIN_VALUE (enumtype) = minnode;
5797 TYPE_MAX_VALUE (enumtype) = maxnode;
5799 /* An enum can have some negative values; then it is signed. */
5800 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5802 /* Determine the precision this type needs. */
5804 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5805 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5806 precision = MAX (lowprec, highprec);
5808 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5809 /* Use the width of the narrowest normal C type which is wide enough. */
5810 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5812 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5814 TYPE_SIZE (enumtype) = 0;
5815 layout_type (enumtype);
5817 if (values != error_mark_node)
5819 /* Change the type of the enumerators to be the enum type.
5820 Formerly this was done only for enums that fit in an int,
5821 but the comment said it was done only for enums wider than int.
5822 It seems necessary to do this for wide enums,
5823 and best not to change what's done for ordinary narrower ones. */
5824 for (pair = values; pair; pair = TREE_CHAIN (pair))
5826 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5827 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5828 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5829 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5832 /* Replace the decl nodes in VALUES with their names. */
5833 for (pair = values; pair; pair = TREE_CHAIN (pair))
5834 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5836 TYPE_VALUES (enumtype) = values;
5839 /* Fix up all variant types of this enum type. */
5840 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5842 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5843 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5844 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5845 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5846 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5847 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5848 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5849 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5852 /* Finish debugging output for this type. */
5853 rest_of_type_compilation (enumtype, toplevel);
5855 /* This matches a push in start_enum. */
5861 /* Build and install a CONST_DECL for one value of the
5862 current enumeration type (one that was begun with start_enum).
5863 Return a tree-list containing the CONST_DECL and its value.
5864 Assignment of sequential values by default is handled here. */
5867 build_enumerator (name, value)
5870 register tree decl, type;
5872 /* Validate and default VALUE. */
5874 /* Remove no-op casts from the value. */
5876 STRIP_TYPE_NOPS (value);
5880 if (TREE_CODE (value) == INTEGER_CST)
5882 value = default_conversion (value);
5883 constant_expression_warning (value);
5887 error ("enumerator value for `%s' not integer constant",
5888 IDENTIFIER_POINTER (name));
5893 /* Default based on previous value. */
5894 /* It should no longer be possible to have NON_LVALUE_EXPR
5898 value = enum_next_value;
5900 error ("overflow in enumeration values");
5903 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5905 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5906 value = integer_zero_node;
5909 /* Set basis for default for next value. */
5910 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5911 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5913 /* Now create a declaration for the enum value name. */
5915 type = TREE_TYPE (value);
5916 type = type_for_size (MAX (TYPE_PRECISION (type),
5917 TYPE_PRECISION (integer_type_node)),
5919 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5920 && TREE_UNSIGNED (type)));
5922 decl = build_decl (CONST_DECL, name, type);
5923 DECL_INITIAL (decl) = value;
5924 TREE_TYPE (value) = type;
5927 return saveable_tree_cons (decl, value, NULL_TREE);
5930 /* Create the FUNCTION_DECL for a function definition.
5931 DECLSPECS, DECLARATOR, and ATTRIBUTES are the parts of the declaration;
5932 they describe the function's name and the type it returns,
5933 but twisted together in a fashion that parallels the syntax of C.
5935 This function creates a binding context for the function body
5936 as well as setting up the FUNCTION_DECL in current_function_decl.
5938 Returns 1 on success. If the DECLARATOR is not suitable for a function
5939 (it defines a datum instead), we return 0, which tells
5940 yyparse to report a parse error.
5942 NESTED is nonzero for a function nested within another function. */
5945 start_function (declspecs, declarator, attributes, nested)
5946 tree declarator, declspecs, attributes;
5949 tree decl1, old_decl;
5951 int old_immediate_size_expand = immediate_size_expand;
5953 current_function_returns_value = 0; /* Assume, until we see it does. */
5954 current_function_returns_null = 0;
5955 warn_about_return_type = 0;
5956 current_extern_inline = 0;
5957 c_function_varargs = 0;
5959 shadowed_labels = 0;
5961 /* Don't expand any sizes in the return type of the function. */
5962 immediate_size_expand = 0;
5964 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5966 /* If the declarator is not suitable for a function definition,
5967 cause a syntax error. */
5972 decl_attributes (decl1, NULL_TREE, attributes);
5974 announce_function (decl1);
5976 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5978 error ("return-type is an incomplete type");
5979 /* Make it return void instead. */
5981 = build_function_type (void_type_node,
5982 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5985 if (warn_about_return_type)
5986 warning ("return-type defaults to `int'");
5988 /* Save the parm names or decls from this function's declarator
5989 where store_parm_decls will find them. */
5990 current_function_parms = last_function_parms;
5991 current_function_parm_tags = last_function_parm_tags;
5993 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5994 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5995 DECL_INITIAL (decl1) = error_mark_node;
5997 /* If this definition isn't a prototype and we had a prototype declaration
5998 before, copy the arg type info from that prototype.
5999 But not if what we had before was a builtin function. */
6000 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6001 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6002 && !DECL_BUILT_IN (old_decl)
6003 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6004 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6005 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6007 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6008 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6009 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6012 /* If there is no explicit declaration, look for any out-of-scope implicit
6015 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6017 /* Optionally warn of old-fashioned def with no previous prototype. */
6018 if (warn_strict_prototypes
6019 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6020 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6021 warning ("function declaration isn't a prototype");
6022 /* Optionally warn of any global def with no previous prototype. */
6023 else if (warn_missing_prototypes
6024 && TREE_PUBLIC (decl1)
6025 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6026 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6027 warning_with_decl (decl1, "no previous prototype for `%s'");
6028 /* Optionally warn of any def with no previous prototype
6029 if the function has already been used. */
6030 else if (warn_missing_prototypes
6031 && old_decl != 0 && TREE_USED (old_decl)
6032 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6033 warning_with_decl (decl1,
6034 "`%s' was used with no prototype before its definition");
6035 /* Optionally warn of any global def with no previous declaration. */
6036 else if (warn_missing_declarations
6037 && TREE_PUBLIC (decl1)
6039 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6040 warning_with_decl (decl1, "no previous declaration for `%s'");
6041 /* Optionally warn of any def with no previous declaration
6042 if the function has already been used. */
6043 else if (warn_missing_declarations
6044 && old_decl != 0 && TREE_USED (old_decl)
6045 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6046 warning_with_decl (decl1,
6047 "`%s' was used with no declaration before its definition");
6049 /* This is a definition, not a reference.
6050 So normally clear DECL_EXTERNAL.
6051 However, `extern inline' acts like a declaration
6052 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6053 DECL_EXTERNAL (decl1) = current_extern_inline;
6055 /* This function exists in static storage.
6056 (This does not mean `static' in the C sense!) */
6057 TREE_STATIC (decl1) = 1;
6059 /* A nested function is not global. */
6060 if (current_function_decl != 0)
6061 TREE_PUBLIC (decl1) = 0;
6063 /* Record the decl so that the function name is defined.
6064 If we already have a decl for this name, and it is a FUNCTION_DECL,
6065 use the old decl. */
6067 current_function_decl = pushdecl (decl1);
6070 declare_parm_level (1);
6071 current_binding_level->subblocks_tag_transparent = 1;
6073 make_function_rtl (current_function_decl);
6075 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6076 /* Promote the value to int before returning it. */
6077 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6079 /* It retains unsignedness if traditional
6080 or if not really getting wider. */
6081 if (TREE_UNSIGNED (restype)
6082 && (flag_traditional
6083 || (TYPE_PRECISION (restype)
6084 == TYPE_PRECISION (integer_type_node))))
6085 restype = unsigned_type_node;
6087 restype = integer_type_node;
6089 DECL_RESULT (current_function_decl)
6090 = build_decl (RESULT_DECL, NULL_TREE, restype);
6093 /* Allocate further tree nodes temporarily during compilation
6094 of this function only. */
6095 temporary_allocation ();
6097 /* If this fcn was already referenced via a block-scope `extern' decl
6098 (or an implicit decl), propagate certain information about the usage. */
6099 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6100 TREE_ADDRESSABLE (current_function_decl) = 1;
6102 immediate_size_expand = old_immediate_size_expand;
6107 /* Record that this function is going to be a varargs function.
6108 This is called before store_parm_decls, which is too early
6109 to call mark_varargs directly. */
6114 c_function_varargs = 1;
6117 /* Store the parameter declarations into the current function declaration.
6118 This is called after parsing the parameter declarations, before
6119 digesting the body of the function.
6121 For an old-style definition, modify the function's type
6122 to specify at least the number of arguments. */
6127 register tree fndecl = current_function_decl;
6130 /* This is either a chain of PARM_DECLs (if a prototype was used)
6131 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6132 tree specparms = current_function_parms;
6134 /* This is a list of types declared among parms in a prototype. */
6135 tree parmtags = current_function_parm_tags;
6137 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6138 register tree parmdecls = getdecls ();
6140 /* This is a chain of any other decls that came in among the parm
6141 declarations. If a parm is declared with enum {foo, bar} x;
6142 then CONST_DECLs for foo and bar are put here. */
6145 /* Nonzero if this definition is written with a prototype. */
6148 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6150 /* This case is when the function was defined with an ANSI prototype.
6151 The parms already have decls, so we need not do anything here
6152 except record them as in effect
6153 and complain if any redundant old-style parm decls were written. */
6164 error_with_decl (fndecl,
6165 "parm types given both in parmlist and separately");
6166 /* Get rid of the erroneous decls; don't keep them on
6167 the list of parms, since they might not be PARM_DECLs. */
6168 for (decl = current_binding_level->names;
6169 decl; decl = TREE_CHAIN (decl))
6170 if (DECL_NAME (decl))
6171 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6172 for (link = current_binding_level->shadowed;
6173 link; link = TREE_CHAIN (link))
6174 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6175 current_binding_level->names = 0;
6176 current_binding_level->shadowed = 0;
6179 specparms = nreverse (specparms);
6180 for (parm = specparms; parm; parm = next)
6182 next = TREE_CHAIN (parm);
6183 if (TREE_CODE (parm) == PARM_DECL)
6185 if (DECL_NAME (parm) == 0)
6186 error_with_decl (parm, "parameter name omitted");
6187 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6189 error_with_decl (parm, "parameter `%s' declared void");
6190 /* Change the type to error_mark_node so this parameter
6191 will be ignored by assign_parms. */
6192 TREE_TYPE (parm) = error_mark_node;
6198 /* If we find an enum constant or a type tag,
6199 put it aside for the moment. */
6200 TREE_CHAIN (parm) = 0;
6201 others = chainon (others, parm);
6205 /* Get the decls in their original chain order
6206 and record in the function. */
6207 DECL_ARGUMENTS (fndecl) = getdecls ();
6210 /* If this function takes a variable number of arguments,
6211 add a phony parameter to the end of the parm list,
6212 to represent the position of the first unnamed argument. */
6213 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6216 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6217 /* Let's hope the address of the unnamed parm
6218 won't depend on its type. */
6219 TREE_TYPE (dummy) = integer_type_node;
6220 DECL_ARG_TYPE (dummy) = integer_type_node;
6221 DECL_ARGUMENTS (fndecl)
6222 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6226 /* Now pushdecl the enum constants. */
6227 for (parm = others; parm; parm = next)
6229 next = TREE_CHAIN (parm);
6230 if (DECL_NAME (parm) == 0)
6232 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6234 else if (TREE_CODE (parm) != PARM_DECL)
6238 storetags (chainon (parmtags, gettags ()));
6242 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6243 each with a parm name as the TREE_VALUE.
6245 PARMDECLS is a chain of declarations for parameters.
6246 Warning! It can also contain CONST_DECLs which are not parameters
6247 but are names of enumerators of any enum types
6248 declared among the parameters.
6250 First match each formal parameter name with its declaration.
6251 Associate decls with the names and store the decls
6252 into the TREE_PURPOSE slots. */
6254 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6255 DECL_RESULT (parm) = 0;
6257 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6259 register tree tail, found = NULL;
6261 if (TREE_VALUE (parm) == 0)
6263 error_with_decl (fndecl, "parameter name missing from parameter list");
6264 TREE_PURPOSE (parm) = 0;
6268 /* See if any of the parmdecls specifies this parm by name.
6269 Ignore any enumerator decls. */
6270 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6271 if (DECL_NAME (tail) == TREE_VALUE (parm)
6272 && TREE_CODE (tail) == PARM_DECL)
6278 /* If declaration already marked, we have a duplicate name.
6279 Complain, and don't use this decl twice. */
6280 if (found && DECL_RESULT (found) != 0)
6282 error_with_decl (found, "multiple parameters named `%s'");
6286 /* If the declaration says "void", complain and ignore it. */
6287 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6289 error_with_decl (found, "parameter `%s' declared void");
6290 TREE_TYPE (found) = integer_type_node;
6291 DECL_ARG_TYPE (found) = integer_type_node;
6292 layout_decl (found, 0);
6295 /* Traditionally, a parm declared float is actually a double. */
6296 if (found && flag_traditional
6297 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6299 TREE_TYPE (found) = double_type_node;
6300 DECL_ARG_TYPE (found) = double_type_node;
6301 layout_decl (found, 0);
6304 /* If no declaration found, default to int. */
6307 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6309 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6310 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6311 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6313 warning_with_decl (found, "type of `%s' defaults to `int'");
6317 TREE_PURPOSE (parm) = found;
6319 /* Mark this decl as "already found" -- see test, above.
6320 It is safe to use DECL_RESULT for this
6321 since it is not used in PARM_DECLs or CONST_DECLs. */
6322 DECL_RESULT (found) = error_mark_node;
6325 /* Put anything which is on the parmdecls chain and which is
6326 not a PARM_DECL onto the list NONPARMS. (The types of
6327 non-parm things which might appear on the list include
6328 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6329 any actual PARM_DECLs not matched with any names. */
6332 for (parm = parmdecls; parm; )
6334 tree next = TREE_CHAIN (parm);
6335 TREE_CHAIN (parm) = 0;
6337 if (TREE_CODE (parm) != PARM_DECL)
6338 nonparms = chainon (nonparms, parm);
6341 /* Complain about args with incomplete types. */
6342 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6344 error_with_decl (parm, "parameter `%s' has incomplete type");
6345 TREE_TYPE (parm) = error_mark_node;
6348 if (DECL_RESULT (parm) == 0)
6350 error_with_decl (parm,
6351 "declaration for parameter `%s' but no such parameter");
6352 /* Pretend the parameter was not missing.
6353 This gets us to a standard state and minimizes
6354 further error messages. */
6356 = chainon (specparms,
6357 tree_cons (parm, NULL_TREE, NULL_TREE));
6364 /* Chain the declarations together in the order of the list of names. */
6365 /* Store that chain in the function decl, replacing the list of names. */
6367 DECL_ARGUMENTS (fndecl) = 0;
6370 for (last = 0; parm; parm = TREE_CHAIN (parm))
6371 if (TREE_PURPOSE (parm))
6374 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6376 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6377 last = TREE_PURPOSE (parm);
6378 TREE_CHAIN (last) = 0;
6382 /* If there was a previous prototype,
6383 set the DECL_ARG_TYPE of each argument according to
6384 the type previously specified, and report any mismatches. */
6386 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6389 for (parm = DECL_ARGUMENTS (fndecl),
6390 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6391 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6392 != void_type_node));
6393 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6395 if (parm == 0 || type == 0
6396 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6398 error ("number of arguments doesn't match prototype");
6399 error_with_file_and_line (current_function_prototype_file,
6400 current_function_prototype_line,
6401 "prototype declaration");
6404 /* Type for passing arg must be consistent
6405 with that declared for the arg. */
6406 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6408 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6409 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6411 /* Adjust argument to match prototype. E.g. a previous
6412 `int foo(float);' prototype causes
6413 `int foo(x) float x; {...}' to be treated like
6414 `int foo(float x) {...}'. This is particularly
6415 useful for argument types like uid_t. */
6416 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6417 #ifdef PROMOTE_PROTOTYPES
6418 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6419 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6420 && TYPE_PRECISION (TREE_TYPE (parm))
6421 < TYPE_PRECISION (integer_type_node))
6422 DECL_ARG_TYPE (parm) = integer_type_node;
6426 pedwarn ("promoted argument `%s' doesn't match prototype",
6427 IDENTIFIER_POINTER (DECL_NAME (parm)));
6428 warning_with_file_and_line
6429 (current_function_prototype_file,
6430 current_function_prototype_line,
6431 "prototype declaration");
6434 /* If -traditional, allow `int' argument to match
6435 `unsigned' prototype. */
6436 else if (! (flag_traditional
6437 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6438 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6440 error ("argument `%s' doesn't match prototype",
6441 IDENTIFIER_POINTER (DECL_NAME (parm)));
6442 error_with_file_and_line (current_function_prototype_file,
6443 current_function_prototype_line,
6444 "prototype declaration");
6448 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6451 /* Otherwise, create a prototype that would match. */
6455 tree actual = 0, last = 0, type;
6457 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6459 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6462 TREE_CHAIN (last) = type;
6467 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6469 TREE_CHAIN (last) = type;
6473 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6474 of the type of this function, but we need to avoid having this
6475 affect the types of other similarly-typed functions, so we must
6476 first force the generation of an identical (but separate) type
6477 node for the relevant function type. The new node we create
6478 will be a variant of the main variant of the original function
6481 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6483 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6486 /* Now store the final chain of decls for the arguments
6487 as the decl-chain of the current lexical scope.
6488 Put the enumerators in as well, at the front so that
6489 DECL_ARGUMENTS is not modified. */
6491 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6494 /* Make sure the binding level for the top of the function body
6495 gets a BLOCK if there are any in the function.
6496 Otherwise, the dbx output is wrong. */
6498 keep_next_if_subblocks = 1;
6500 /* ??? This might be an improvement,
6501 but needs to be thought about some more. */
6503 keep_next_level_flag = 1;
6506 /* Write a record describing this function definition to the prototypes
6507 file (if requested). */
6509 gen_aux_info_record (fndecl, 1, 0, prototype);
6511 /* Initialize the RTL code for the function. */
6513 init_function_start (fndecl, input_filename, lineno);
6515 /* If this is a varargs function, inform function.c. */
6517 if (c_function_varargs)
6520 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6522 declare_function_name ();
6524 /* Set up parameters and prepare for return, for the function. */
6526 expand_function_start (fndecl, 0);
6528 /* If this function is `main', emit a call to `__main'
6529 to run global initializers, etc. */
6530 if (DECL_NAME (fndecl)
6531 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6532 && DECL_CONTEXT (fndecl) == NULL_TREE)
6533 expand_main_function ();
6536 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6537 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6538 stands for an ellipsis in the identifier list.
6540 PARMLIST is the data returned by get_parm_info for the
6541 parmlist that follows the semicolon.
6543 We return a value of the same sort that get_parm_info returns,
6544 except that it describes the combination of identifiers and parmlist. */
6547 combine_parm_decls (specparms, parmlist, void_at_end)
6548 tree specparms, parmlist;
6551 register tree fndecl = current_function_decl;
6554 tree parmdecls = TREE_PURPOSE (parmlist);
6556 /* This is a chain of any other decls that came in among the parm
6557 declarations. They were separated already by get_parm_info,
6558 so we just need to keep them separate. */
6559 tree nonparms = TREE_VALUE (parmlist);
6563 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6564 DECL_RESULT (parm) = 0;
6566 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6568 register tree tail, found = NULL;
6570 /* See if any of the parmdecls specifies this parm by name. */
6571 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6572 if (DECL_NAME (tail) == TREE_VALUE (parm))
6578 /* If declaration already marked, we have a duplicate name.
6579 Complain, and don't use this decl twice. */
6580 if (found && DECL_RESULT (found) != 0)
6582 error_with_decl (found, "multiple parameters named `%s'");
6586 /* If the declaration says "void", complain and ignore it. */
6587 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6589 error_with_decl (found, "parameter `%s' declared void");
6590 TREE_TYPE (found) = integer_type_node;
6591 DECL_ARG_TYPE (found) = integer_type_node;
6592 layout_decl (found, 0);
6595 /* Traditionally, a parm declared float is actually a double. */
6596 if (found && flag_traditional
6597 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6599 TREE_TYPE (found) = double_type_node;
6600 DECL_ARG_TYPE (found) = double_type_node;
6601 layout_decl (found, 0);
6604 /* If no declaration found, default to int. */
6607 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6609 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6610 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6611 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6612 error_with_decl (found, "type of parameter `%s' is not declared");
6616 TREE_PURPOSE (parm) = found;
6618 /* Mark this decl as "already found" -- see test, above.
6619 It is safe to use DECL_RESULT for this
6620 since it is not used in PARM_DECLs or CONST_DECLs. */
6621 DECL_RESULT (found) = error_mark_node;
6624 /* Complain about any actual PARM_DECLs not matched with any names. */
6626 for (parm = parmdecls; parm; )
6628 tree next = TREE_CHAIN (parm);
6629 TREE_CHAIN (parm) = 0;
6631 /* Complain about args with incomplete types. */
6632 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6634 error_with_decl (parm, "parameter `%s' has incomplete type");
6635 TREE_TYPE (parm) = error_mark_node;
6638 if (DECL_RESULT (parm) == 0)
6640 error_with_decl (parm,
6641 "declaration for parameter `%s' but no such parameter");
6642 /* Pretend the parameter was not missing.
6643 This gets us to a standard state and minimizes
6644 further error messages. */
6646 = chainon (specparms,
6647 tree_cons (parm, NULL_TREE, NULL_TREE));
6653 /* Chain the declarations together in the order of the list of names.
6654 At the same time, build up a list of their types, in reverse order. */
6660 for (last = 0; parm; parm = TREE_CHAIN (parm))
6661 if (TREE_PURPOSE (parm))
6664 parmdecls = TREE_PURPOSE (parm);
6666 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6667 last = TREE_PURPOSE (parm);
6668 TREE_CHAIN (last) = 0;
6670 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6675 return saveable_tree_cons (parmdecls, nonparms,
6676 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6678 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6681 /* Finish up a function declaration and compile that function
6682 all the way to assembler language output. The free the storage
6683 for the function definition.
6685 This is called after parsing the body of the function definition.
6687 NESTED is nonzero if the function being finished is nested in another. */
6690 finish_function (nested)
6693 register tree fndecl = current_function_decl;
6695 /* TREE_READONLY (fndecl) = 1;
6696 This caused &foo to be of type ptr-to-const-function
6697 which then got a warning when stored in a ptr-to-function variable. */
6700 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6702 /* Must mark the RESULT_DECL as being in this function. */
6704 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6706 /* Obey `register' declarations if `setjmp' is called in this fn. */
6707 if (flag_traditional && current_function_calls_setjmp)
6709 setjmp_protect (DECL_INITIAL (fndecl));
6710 setjmp_protect_args ();
6713 #ifdef DEFAULT_MAIN_RETURN
6714 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6716 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6717 != integer_type_node)
6718 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6721 /* Make it so that `main' always returns success by default. */
6722 DEFAULT_MAIN_RETURN;
6727 /* Generate rtl for function exit. */
6728 expand_function_end (input_filename, lineno, 0);
6730 /* So we can tell if jump_optimize sets it to 1. */
6733 /* Run the optimizers and output the assembler code for this function. */
6734 rest_of_compilation (fndecl);
6736 current_function_returns_null |= can_reach_end;
6738 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6739 warning ("`noreturn' function does return");
6740 else if (warn_return_type && can_reach_end
6741 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6742 /* If this function returns non-void and control can drop through,
6744 warning ("control reaches end of non-void function");
6745 /* With just -W, complain only if function returns both with
6746 and without a value. */
6747 else if (extra_warnings
6748 && current_function_returns_value && current_function_returns_null)
6749 warning ("this function may return with or without a value");
6751 /* If requested, warn about function definitions where the function will
6752 return a value (usually of some struct or union type) which itself will
6753 take up a lot of stack space. */
6755 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6757 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6761 register tree ret_type_size = TYPE_SIZE (ret_type);
6763 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6766 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6768 if (units > larger_than_size)
6769 warning_with_decl (fndecl,
6770 "size of return value of `%s' is %u bytes",
6776 /* Free all the tree nodes making up this function. */
6777 /* Switch back to allocating nodes permanently
6778 until we start another function. */
6780 permanent_allocation (1);
6782 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6784 /* Stop pointing to the local nodes about to be freed. */
6785 /* But DECL_INITIAL must remain nonzero so we know this
6786 was an actual function definition. */
6787 /* For a nested function, this is done in pop_c_function_context. */
6788 /* If rest_of_compilation set this to 0, leave it 0. */
6789 if (DECL_INITIAL (fndecl) != 0)
6790 DECL_INITIAL (fndecl) = error_mark_node;
6791 DECL_ARGUMENTS (fndecl) = 0;
6794 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6796 #ifndef ASM_OUTPUT_CONSTRUCTOR
6797 if (! flag_gnu_linker)
6798 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6801 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6803 if (DECL_STATIC_DESTRUCTOR (fndecl))
6805 #ifndef ASM_OUTPUT_DESTRUCTOR
6806 if (! flag_gnu_linker)
6807 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6810 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6815 /* Let the error reporting routines know that we're outside a
6816 function. For a nested function, this value is used in
6817 pop_c_function_context and then reset via pop_function_context. */
6818 current_function_decl = NULL;
6822 /* Save and restore the variables in this file and elsewhere
6823 that keep track of the progress of compilation of the current function.
6824 Used for nested functions. */
6828 struct c_function *next;
6830 tree shadowed_labels;
6833 int warn_about_return_type;
6835 struct binding_level *binding_level;
6838 struct c_function *c_function_chain;
6840 /* Save and reinitialize the variables
6841 used during compilation of a C function. */
6844 push_c_function_context ()
6846 struct c_function *p
6847 = (struct c_function *) xmalloc (sizeof (struct c_function));
6850 pedwarn ("ANSI C forbids nested functions");
6852 push_function_context ();
6854 p->next = c_function_chain;
6855 c_function_chain = p;
6857 p->named_labels = named_labels;
6858 p->shadowed_labels = shadowed_labels;
6859 p->returns_value = current_function_returns_value;
6860 p->returns_null = current_function_returns_null;
6861 p->warn_about_return_type = warn_about_return_type;
6862 p->extern_inline = current_extern_inline;
6863 p->binding_level = current_binding_level;
6866 /* Restore the variables used during compilation of a C function. */
6869 pop_c_function_context ()
6871 struct c_function *p = c_function_chain;
6874 /* Bring back all the labels that were shadowed. */
6875 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6876 if (DECL_NAME (TREE_VALUE (link)) != 0)
6877 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6878 = TREE_VALUE (link);
6880 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6882 /* Stop pointing to the local nodes about to be freed. */
6883 /* But DECL_INITIAL must remain nonzero so we know this
6884 was an actual function definition. */
6885 DECL_INITIAL (current_function_decl) = error_mark_node;
6886 DECL_ARGUMENTS (current_function_decl) = 0;
6889 pop_function_context ();
6891 c_function_chain = p->next;
6893 named_labels = p->named_labels;
6894 shadowed_labels = p->shadowed_labels;
6895 current_function_returns_value = p->returns_value;
6896 current_function_returns_null = p->returns_null;
6897 warn_about_return_type = p->warn_about_return_type;
6898 current_extern_inline = p->extern_inline;
6899 current_binding_level = p->binding_level;
6904 /* integrate_decl_tree calls this function, but since we don't use the
6905 DECL_LANG_SPECIFIC field, this is a no-op. */
6908 copy_lang_decl (node)