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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
37 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
39 { NORMAL, /* Ordinary declaration */
40 FUNCDEF, /* Function definition */
41 PARM, /* Declaration of parm before function body */
42 FIELD, /* Declaration inside struct or union */
43 BITFIELD, /* Likewise but with specified width */
44 TYPENAME}; /* Typename (inside cast or sizeof) */
46 #ifndef CHAR_TYPE_SIZE
47 #define CHAR_TYPE_SIZE BITS_PER_UNIT
50 #ifndef SHORT_TYPE_SIZE
51 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
55 #define INT_TYPE_SIZE BITS_PER_WORD
58 #ifndef LONG_TYPE_SIZE
59 #define LONG_TYPE_SIZE BITS_PER_WORD
62 #ifndef LONG_LONG_TYPE_SIZE
63 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
66 #ifndef WCHAR_UNSIGNED
67 #define WCHAR_UNSIGNED 0
70 #ifndef FLOAT_TYPE_SIZE
71 #define FLOAT_TYPE_SIZE BITS_PER_WORD
74 #ifndef DOUBLE_TYPE_SIZE
75 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
78 #ifndef LONG_DOUBLE_TYPE_SIZE
79 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
82 /* We let tm.h override the types used here, to handle trivial differences
83 such as the choice of unsigned int or long unsigned int for size_t.
84 When machines start needing nontrivial differences in the size type,
85 it would be best to do something here to figure out automatically
86 from other information what type to use. */
89 #define SIZE_TYPE "long unsigned int"
93 #define PTRDIFF_TYPE "long int"
97 #define WCHAR_TYPE "int"
100 /* a node which has tree code ERROR_MARK, and whose type is itself.
101 All erroneous expressions are replaced with this node. All functions
102 that accept nodes as arguments should avoid generating error messages
103 if this node is one of the arguments, since it is undesirable to get
104 multiple error messages from one error in the input. */
106 tree error_mark_node;
108 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
110 tree short_integer_type_node;
111 tree integer_type_node;
112 tree long_integer_type_node;
113 tree long_long_integer_type_node;
115 tree short_unsigned_type_node;
116 tree unsigned_type_node;
117 tree long_unsigned_type_node;
118 tree long_long_unsigned_type_node;
120 tree boolean_type_node;
121 tree boolean_false_node;
122 tree boolean_true_node;
124 tree ptrdiff_type_node;
126 tree unsigned_char_type_node;
127 tree signed_char_type_node;
129 tree wchar_type_node;
130 tree signed_wchar_type_node;
131 tree unsigned_wchar_type_node;
133 tree float_type_node;
134 tree double_type_node;
135 tree long_double_type_node;
137 tree complex_integer_type_node;
138 tree complex_float_type_node;
139 tree complex_double_type_node;
140 tree complex_long_double_type_node;
142 tree intQI_type_node;
143 tree intHI_type_node;
144 tree intSI_type_node;
145 tree intDI_type_node;
147 tree unsigned_intQI_type_node;
148 tree unsigned_intHI_type_node;
149 tree unsigned_intSI_type_node;
150 tree unsigned_intDI_type_node;
152 /* a VOID_TYPE node. */
156 /* Nodes for types `void *' and `const void *'. */
158 tree ptr_type_node, const_ptr_type_node;
160 /* Nodes for types `char *' and `const char *'. */
162 tree string_type_node, const_string_type_node;
164 /* Type `char[SOMENUMBER]'.
165 Used when an array of char is needed and the size is irrelevant. */
167 tree char_array_type_node;
169 /* Type `int[SOMENUMBER]' or something like it.
170 Used when an array of int needed and the size is irrelevant. */
172 tree int_array_type_node;
174 /* Type `wchar_t[SOMENUMBER]' or something like it.
175 Used when a wide string literal is created. */
177 tree wchar_array_type_node;
179 /* type `int ()' -- used for implicit declaration of functions. */
181 tree default_function_type;
183 /* function types `double (double)' and `double (double, double)', etc. */
185 tree double_ftype_double, double_ftype_double_double;
186 tree int_ftype_int, long_ftype_long;
187 tree float_ftype_float;
188 tree ldouble_ftype_ldouble;
190 /* Function type `void (void *, void *, int)' and similar ones */
192 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
194 /* Function type `char *(char *, char *)' and similar ones */
195 tree string_ftype_ptr_ptr, int_ftype_string_string;
197 /* Function type `int (const void *, const void *, size_t)' */
198 tree int_ftype_cptr_cptr_sizet;
200 /* Two expressions that are constants with value zero.
201 The first is of type `int', the second of type `void *'. */
203 tree integer_zero_node;
204 tree null_pointer_node;
206 /* A node for the integer constant 1. */
208 tree integer_one_node;
210 /* Nonzero if we have seen an invalid cross reference
211 to a struct, union, or enum, but not yet printed the message. */
213 tree pending_invalid_xref;
214 /* File and line to appear in the eventual error message. */
215 char *pending_invalid_xref_file;
216 int pending_invalid_xref_line;
218 /* While defining an enum type, this is 1 plus the last enumerator
219 constant value. Note that will do not have to save this or `enum_overflow'
220 around nested function definition since such a definition could only
221 occur in an enum value expression and we don't use these variables in
224 static tree enum_next_value;
226 /* Nonzero means that there was overflow computing enum_next_value. */
228 static int enum_overflow;
230 /* Parsing a function declarator leaves a list of parameter names
231 or a chain or parameter decls here. */
233 static tree last_function_parms;
235 /* Parsing a function declarator leaves here a chain of structure
236 and enum types declared in the parmlist. */
238 static tree last_function_parm_tags;
240 /* After parsing the declarator that starts a function definition,
241 `start_function' puts here the list of parameter names or chain of decls.
242 `store_parm_decls' finds it here. */
244 static tree current_function_parms;
246 /* Similar, for last_function_parm_tags. */
247 static tree current_function_parm_tags;
249 /* Similar, for the file and line that the prototype came from if this is
250 an old-style definition. */
251 static char *current_function_prototype_file;
252 static int current_function_prototype_line;
254 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
255 that have names. Here so we can clear out their names' definitions
256 at the end of the function. */
258 static tree named_labels;
260 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
262 static tree shadowed_labels;
264 /* Nonzero when store_parm_decls is called indicates a varargs function.
265 Value not meaningful after store_parm_decls. */
267 static int c_function_varargs;
269 /* The FUNCTION_DECL for the function currently being compiled,
270 or 0 if between functions. */
271 tree current_function_decl;
273 /* Set to 0 at beginning of a function definition, set to 1 if
274 a return statement that specifies a return value is seen. */
276 int current_function_returns_value;
278 /* Set to 0 at beginning of a function definition, set to 1 if
279 a return statement with no argument is seen. */
281 int current_function_returns_null;
283 /* Set to nonzero by `grokdeclarator' for a function
284 whose return type is defaulted, if warnings for this are desired. */
286 static int warn_about_return_type;
288 /* Nonzero when starting a function declared `extern inline'. */
290 static int current_extern_inline;
292 /* For each binding contour we allocate a binding_level structure
293 * which records the names defined in that contour.
296 * 1) one for each function definition,
297 * where internal declarations of the parameters appear.
298 * 2) one for each compound statement,
299 * to record its declarations.
301 * The current meaning of a name can be found by searching the levels from
302 * the current one out to the global one.
305 /* Note that the information in the `names' component of the global contour
306 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
310 /* A chain of _DECL nodes for all variables, constants, functions,
311 and typedef types. These are in the reverse of the order supplied.
315 /* A list of structure, union and enum definitions,
316 * for looking up tag names.
317 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
318 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
319 * or ENUMERAL_TYPE node.
323 /* For each level, a list of shadowed outer-level local definitions
324 to be restored when this level is popped.
325 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
326 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
329 /* For each level (except not the global one),
330 a chain of BLOCK nodes for all the levels
331 that were entered and exited one level down. */
334 /* The BLOCK node for this level, if one has been preallocated.
335 If 0, the BLOCK is allocated (if needed) when the level is popped. */
338 /* The binding level which this one is contained in (inherits from). */
339 struct binding_level *level_chain;
341 /* Nonzero for the level that holds the parameters of a function. */
344 /* Nonzero if this level "doesn't exist" for tags. */
345 char tag_transparent;
347 /* Nonzero if sublevels of this level "don't exist" for tags.
348 This is set in the parm level of a function definition
349 while reading the function body, so that the outermost block
350 of the function body will be tag-transparent. */
351 char subblocks_tag_transparent;
353 /* Nonzero means make a BLOCK for this level regardless of all else. */
356 /* Nonzero means make a BLOCK if this level has any subblocks. */
357 char keep_if_subblocks;
359 /* Number of decls in `names' that have incomplete
360 structure or union types. */
363 /* A list of decls giving the (reversed) specified order of parms,
364 not including any forward-decls in the parmlist.
365 This is so we can put the parms in proper order for assign_parms. */
369 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
371 /* The binding level currently in effect. */
373 static struct binding_level *current_binding_level;
375 /* A chain of binding_level structures awaiting reuse. */
377 static struct binding_level *free_binding_level;
379 /* The outermost binding level, for names of file scope.
380 This is created when the compiler is started and exists
381 through the entire run. */
383 static struct binding_level *global_binding_level;
385 /* Binding level structures are initialized by copying this one. */
387 static struct binding_level clear_binding_level
388 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
391 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
393 static int keep_next_level_flag;
395 /* Nonzero means make a BLOCK for the next level pushed
396 if it has subblocks. */
398 static int keep_next_if_subblocks;
400 /* The chain of outer levels of label scopes.
401 This uses the same data structure used for binding levels,
402 but it works differently: each link in the chain records
403 saved values of named_labels and shadowed_labels for
404 a label binding level outside the current one. */
406 static struct binding_level *label_level_chain;
408 /* Functions called automatically at the beginning and end of execution. */
410 tree static_ctors, static_dtors;
412 /* Forward declarations. */
414 static tree grokparms (), grokdeclarator ();
416 tree builtin_function ();
417 void shadow_tag_warned ();
419 static tree lookup_tag ();
420 static tree lookup_tag_reverse ();
421 tree lookup_name_current_level ();
422 static char *redeclaration_error_message ();
423 static void layout_array_type ();
425 /* C-specific option variables. */
427 /* Nonzero means allow type mismatches in conditional expressions;
428 just make their values `void'. */
430 int flag_cond_mismatch;
432 /* Nonzero means give `double' the same size as `float'. */
434 int flag_short_double;
436 /* Nonzero means don't recognize the keyword `asm'. */
440 /* Nonzero means don't recognize any builtin functions. */
444 /* Nonzero means don't recognize the non-ANSI builtin functions.
447 int flag_no_nonansi_builtin;
449 /* Nonzero means do some things the same way PCC does. */
451 int flag_traditional;
453 /* Nonzero means to allow single precision math even if we're generally
454 being traditional. */
455 int flag_allow_single_precision = 0;
457 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
459 int flag_signed_bitfields = 1;
460 int explicit_flag_signed_bitfields = 0;
462 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
464 int flag_no_ident = 0;
466 /* Nonzero means warn about implicit declarations. */
470 /* Nonzero means give string constants the type `const char *'
471 to get extra warnings from them. These warnings will be too numerous
472 to be useful, except in thoroughly ANSIfied programs. */
474 int warn_write_strings;
476 /* Nonzero means warn about pointer casts that can drop a type qualifier
477 from the pointer target type. */
481 /* Nonzero means warn when casting a function call to a type that does
482 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
483 when there is no previous declaration of sqrt or malloc. */
485 int warn_bad_function_cast;
487 /* Warn about traditional constructs whose meanings changed in ANSI C. */
489 int warn_traditional;
491 /* Nonzero means warn about sizeof(function) or addition/subtraction
492 of function pointers. */
494 int warn_pointer_arith;
496 /* Nonzero means warn for non-prototype function decls
497 or non-prototyped defs without previous prototype. */
499 int warn_strict_prototypes;
501 /* Nonzero means warn for any global function def
502 without separate previous prototype decl. */
504 int warn_missing_prototypes;
506 /* Nonzero means warn for any global function def
507 without separate previous decl. */
509 int warn_missing_declarations;
511 /* Nonzero means warn about multiple (redundant) decls for the same single
512 variable or function. */
514 int warn_redundant_decls = 0;
516 /* Nonzero means warn about extern declarations of objects not at
517 file-scope level and about *all* declarations of functions (whether
518 extern or static) not at file-scope level. Note that we exclude
519 implicit function declarations. To get warnings about those, use
522 int warn_nested_externs = 0;
524 /* Warn about *printf or *scanf format/argument anomalies. */
528 /* Warn about a subscript that has type char. */
530 int warn_char_subscripts = 0;
532 /* Warn if a type conversion is done that might have confusing results. */
536 /* Warn if adding () is suggested. */
538 int warn_parentheses;
540 /* Warn if initializer is not completely bracketed. */
542 int warn_missing_braces;
544 /* Nonzero means `$' can be in an identifier.
545 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
547 #ifndef DOLLARS_IN_IDENTIFIERS
548 #define DOLLARS_IN_IDENTIFIERS 1
550 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
552 /* Decode the string P as a language-specific option for C.
553 Return 1 if it is recognized (and handle it);
554 return 0 if not recognized. */
560 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
562 flag_traditional = 1;
563 flag_writable_strings = 1;
564 #if DOLLARS_IN_IDENTIFIERS > 0
565 dollars_in_ident = 1;
568 else if (!strcmp (p, "-fallow-single-precision"))
569 flag_allow_single_precision = 1;
570 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
572 flag_traditional = 0;
573 flag_writable_strings = 0;
574 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
576 else if (!strcmp (p, "-fdollars-in-identifiers"))
578 #if DOLLARS_IN_IDENTIFIERS > 0
579 dollars_in_ident = 1;
582 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
583 dollars_in_ident = 0;
584 else if (!strcmp (p, "-fsigned-char"))
585 flag_signed_char = 1;
586 else if (!strcmp (p, "-funsigned-char"))
587 flag_signed_char = 0;
588 else if (!strcmp (p, "-fno-signed-char"))
589 flag_signed_char = 0;
590 else if (!strcmp (p, "-fno-unsigned-char"))
591 flag_signed_char = 1;
592 else if (!strcmp (p, "-fsigned-bitfields")
593 || !strcmp (p, "-fno-unsigned-bitfields"))
595 flag_signed_bitfields = 1;
596 explicit_flag_signed_bitfields = 1;
598 else if (!strcmp (p, "-funsigned-bitfields")
599 || !strcmp (p, "-fno-signed-bitfields"))
601 flag_signed_bitfields = 0;
602 explicit_flag_signed_bitfields = 1;
604 else if (!strcmp (p, "-fshort-enums"))
605 flag_short_enums = 1;
606 else if (!strcmp (p, "-fno-short-enums"))
607 flag_short_enums = 0;
608 else if (!strcmp (p, "-fcond-mismatch"))
609 flag_cond_mismatch = 1;
610 else if (!strcmp (p, "-fno-cond-mismatch"))
611 flag_cond_mismatch = 0;
612 else if (!strcmp (p, "-fshort-double"))
613 flag_short_double = 1;
614 else if (!strcmp (p, "-fno-short-double"))
615 flag_short_double = 0;
616 else if (!strcmp (p, "-fasm"))
618 else if (!strcmp (p, "-fno-asm"))
620 else if (!strcmp (p, "-fbuiltin"))
622 else if (!strcmp (p, "-fno-builtin"))
624 else if (!strcmp (p, "-fno-ident"))
626 else if (!strcmp (p, "-fident"))
628 else if (!strcmp (p, "-ansi"))
629 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
630 else if (!strcmp (p, "-Wimplicit"))
632 else if (!strcmp (p, "-Wno-implicit"))
634 else if (!strcmp (p, "-Wwrite-strings"))
635 warn_write_strings = 1;
636 else if (!strcmp (p, "-Wno-write-strings"))
637 warn_write_strings = 0;
638 else if (!strcmp (p, "-Wcast-qual"))
640 else if (!strcmp (p, "-Wno-cast-qual"))
642 else if (!strcmp (p, "-Wbad-function-cast"))
643 warn_bad_function_cast = 1;
644 else if (!strcmp (p, "-Wno-bad-function-cast"))
645 warn_bad_function_cast = 0;
646 else if (!strcmp (p, "-Wpointer-arith"))
647 warn_pointer_arith = 1;
648 else if (!strcmp (p, "-Wno-pointer-arith"))
649 warn_pointer_arith = 0;
650 else if (!strcmp (p, "-Wstrict-prototypes"))
651 warn_strict_prototypes = 1;
652 else if (!strcmp (p, "-Wno-strict-prototypes"))
653 warn_strict_prototypes = 0;
654 else if (!strcmp (p, "-Wmissing-prototypes"))
655 warn_missing_prototypes = 1;
656 else if (!strcmp (p, "-Wno-missing-prototypes"))
657 warn_missing_prototypes = 0;
658 else if (!strcmp (p, "-Wmissing-declarations"))
659 warn_missing_declarations = 1;
660 else if (!strcmp (p, "-Wno-missing-declarations"))
661 warn_missing_declarations = 0;
662 else if (!strcmp (p, "-Wredundant-decls"))
663 warn_redundant_decls = 1;
664 else if (!strcmp (p, "-Wno-redundant-decls"))
665 warn_redundant_decls = 0;
666 else if (!strcmp (p, "-Wnested-externs"))
667 warn_nested_externs = 1;
668 else if (!strcmp (p, "-Wno-nested-externs"))
669 warn_nested_externs = 0;
670 else if (!strcmp (p, "-Wtraditional"))
671 warn_traditional = 1;
672 else if (!strcmp (p, "-Wno-traditional"))
673 warn_traditional = 0;
674 else if (!strcmp (p, "-Wformat"))
676 else if (!strcmp (p, "-Wno-format"))
678 else if (!strcmp (p, "-Wchar-subscripts"))
679 warn_char_subscripts = 1;
680 else if (!strcmp (p, "-Wno-char-subscripts"))
681 warn_char_subscripts = 0;
682 else if (!strcmp (p, "-Wconversion"))
684 else if (!strcmp (p, "-Wno-conversion"))
686 else if (!strcmp (p, "-Wparentheses"))
687 warn_parentheses = 1;
688 else if (!strcmp (p, "-Wno-parentheses"))
689 warn_parentheses = 0;
690 else if (!strcmp (p, "-Wreturn-type"))
691 warn_return_type = 1;
692 else if (!strcmp (p, "-Wno-return-type"))
693 warn_return_type = 0;
694 else if (!strcmp (p, "-Wcomment"))
695 ; /* cpp handles this one. */
696 else if (!strcmp (p, "-Wno-comment"))
697 ; /* cpp handles this one. */
698 else if (!strcmp (p, "-Wcomments"))
699 ; /* cpp handles this one. */
700 else if (!strcmp (p, "-Wno-comments"))
701 ; /* cpp handles this one. */
702 else if (!strcmp (p, "-Wtrigraphs"))
703 ; /* cpp handles this one. */
704 else if (!strcmp (p, "-Wno-trigraphs"))
705 ; /* cpp handles this one. */
706 else if (!strcmp (p, "-Wimport"))
707 ; /* cpp handles this one. */
708 else if (!strcmp (p, "-Wno-import"))
709 ; /* cpp handles this one. */
710 else if (!strcmp (p, "-Wmissing-braces"))
711 warn_missing_braces = 1;
712 else if (!strcmp (p, "-Wno-missing-braces"))
713 warn_missing_braces = 0;
714 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
1590 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1592 register tree type, parm;
1594 /* Prototype decl follows defn w/o prototype. */
1596 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1597 type = TYPE_ARG_TYPES (newtype),
1599 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1600 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1601 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1603 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1604 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1606 errmsg = "prototype for `%s' follows and number of arguments";
1609 /* Type for passing arg must be consistent
1610 with that declared for the arg. */
1611 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1612 /* If -traditional, allow `unsigned int' instead of `int'
1613 in the prototype. */
1614 && (! (flag_traditional
1615 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1616 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1618 errmsg = "prototype for `%s' follows and argument %d";
1624 error_with_decl (newdecl, errmsg, nargs);
1625 error_with_decl (olddecl,
1626 "doesn't match non-prototype definition here");
1630 warning_with_decl (newdecl, "prototype for `%s' follows");
1631 warning_with_decl (olddecl, "non-prototype definition here");
1634 /* Warn about mismatches in various flags. */
1637 /* Warn if function is now inline
1638 but was previously declared not inline and has been called. */
1639 if (TREE_CODE (olddecl) == FUNCTION_DECL
1640 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1641 && TREE_USED (olddecl))
1642 warning_with_decl (newdecl,
1643 "`%s' declared inline after being called");
1644 if (TREE_CODE (olddecl) == FUNCTION_DECL
1645 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1646 && DECL_INITIAL (olddecl) != 0)
1647 warning_with_decl (newdecl,
1648 "`%s' declared inline after its definition");
1650 /* If pedantic, warn when static declaration follows a non-static
1651 declaration. Otherwise, do so only for functions. */
1652 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1653 && TREE_PUBLIC (olddecl)
1654 && !TREE_PUBLIC (newdecl))
1655 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1657 /* Warn when const declaration follows a non-const
1658 declaration, but not for functions. */
1659 if (TREE_CODE (olddecl) != FUNCTION_DECL
1660 && !TREE_READONLY (olddecl)
1661 && TREE_READONLY (newdecl))
1662 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1663 /* These bits are logically part of the type, for variables.
1664 But not for functions
1665 (where qualifiers are not valid ANSI anyway). */
1666 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1667 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1668 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1669 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1673 /* Optionally warn about more than one declaration for the same name. */
1674 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1675 /* Dont warn about a function declaration
1676 followed by a definition. */
1677 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1678 && DECL_INITIAL (olddecl) == 0)
1679 /* Don't warn about extern decl followed by (tentative) definition. */
1680 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1682 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1683 warning_with_decl (olddecl, "previous declaration of `%s'");
1686 /* Copy all the DECL_... slots specified in the new decl
1687 except for any that we copy here from the old type.
1689 Past this point, we don't change OLDTYPE and NEWTYPE
1690 even if we change the types of NEWDECL and OLDDECL. */
1694 /* Make sure we put the new type in the same obstack as the old ones.
1695 If the old types are not both in the same obstack, use the permanent
1697 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1698 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1701 push_obstacks_nochange ();
1702 end_temporary_allocation ();
1705 /* Merge the data types specified in the two decls. */
1706 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1708 = TREE_TYPE (olddecl)
1709 = common_type (newtype, oldtype);
1711 /* Lay the type out, unless already done. */
1712 if (oldtype != TREE_TYPE (newdecl))
1714 if (TREE_TYPE (newdecl) != error_mark_node)
1715 layout_type (TREE_TYPE (newdecl));
1716 if (TREE_CODE (newdecl) != FUNCTION_DECL
1717 && TREE_CODE (newdecl) != TYPE_DECL
1718 && TREE_CODE (newdecl) != CONST_DECL)
1719 layout_decl (newdecl, 0);
1723 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1724 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1725 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1726 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1727 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1730 /* Keep the old rtl since we can safely use it. */
1731 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1733 /* Merge the type qualifiers. */
1734 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1735 && !TREE_THIS_VOLATILE (newdecl))
1736 TREE_THIS_VOLATILE (olddecl) = 0;
1737 if (TREE_READONLY (newdecl))
1738 TREE_READONLY (olddecl) = 1;
1739 if (TREE_THIS_VOLATILE (newdecl))
1741 TREE_THIS_VOLATILE (olddecl) = 1;
1742 if (TREE_CODE (newdecl) == VAR_DECL)
1743 make_var_volatile (newdecl);
1746 /* Keep source location of definition rather than declaration.
1747 Likewise, keep decl at outer scope. */
1748 if ((DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1749 || (DECL_CONTEXT (newdecl) != 0 && DECL_CONTEXT (olddecl) == 0))
1751 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1752 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1754 if (DECL_CONTEXT (olddecl) == 0
1755 && TREE_CODE (newdecl) != FUNCTION_DECL)
1756 DECL_CONTEXT (newdecl) = 0;
1759 /* Merge the unused-warning information. */
1760 if (DECL_IN_SYSTEM_HEADER (olddecl))
1761 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1762 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1763 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1765 /* Merge the initialization information. */
1766 if (DECL_INITIAL (newdecl) == 0)
1767 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1769 /* Merge the section attribute.
1770 We want to issue an error if the sections conflict but that must be
1771 done later in decl_attributes since we are called before attributes
1773 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1774 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1776 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1778 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1779 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1784 /* If cannot merge, then use the new type and qualifiers,
1785 and don't preserve the old rtl. */
1788 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1789 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1790 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1791 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1794 /* Merge the storage class information. */
1795 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1796 /* For functions, static overrides non-static. */
1797 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1799 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1800 /* This is since we don't automatically
1801 copy the attributes of NEWDECL into OLDDECL. */
1802 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1803 /* If this clears `static', clear it in the identifier too. */
1804 if (! TREE_PUBLIC (olddecl))
1805 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1807 if (DECL_EXTERNAL (newdecl))
1809 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1810 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1811 /* An extern decl does not override previous storage class. */
1812 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1816 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1817 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1820 /* If either decl says `inline', this fn is inline,
1821 unless its definition was passed already. */
1822 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1823 DECL_INLINE (olddecl) = 1;
1824 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1826 /* Get rid of any built-in function if new arg types don't match it
1827 or if we have a function definition. */
1828 if (TREE_CODE (newdecl) == FUNCTION_DECL
1829 && DECL_BUILT_IN (olddecl)
1830 && (!types_match || new_is_definition))
1832 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1833 DECL_BUILT_IN (olddecl) = 0;
1836 /* If redeclaring a builtin function, and not a definition,
1838 Also preserve various other info from the definition. */
1839 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1841 if (DECL_BUILT_IN (olddecl))
1843 DECL_BUILT_IN (newdecl) = 1;
1844 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1847 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1849 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1850 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1851 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1852 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1855 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1856 But preserve OLDdECL's DECL_UID. */
1858 register unsigned olddecl_uid = DECL_UID (olddecl);
1860 bcopy ((char *) newdecl + sizeof (struct tree_common),
1861 (char *) olddecl + sizeof (struct tree_common),
1862 sizeof (struct tree_decl) - sizeof (struct tree_common));
1863 DECL_UID (olddecl) = olddecl_uid;
1869 /* Record a decl-node X as belonging to the current lexical scope.
1870 Check for errors (such as an incompatible declaration for the same
1871 name already seen in the same scope).
1873 Returns either X or an old decl for the same name.
1874 If an old decl is returned, it may have been smashed
1875 to agree with what X says. */
1882 register tree name = DECL_NAME (x);
1883 register struct binding_level *b = current_binding_level;
1885 DECL_CONTEXT (x) = current_function_decl;
1886 /* A local extern declaration for a function doesn't constitute nesting.
1887 A local auto declaration does, since it's a forward decl
1888 for a nested function coming later. */
1889 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1890 && DECL_EXTERNAL (x))
1891 DECL_CONTEXT (x) = 0;
1893 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1894 && x != IDENTIFIER_IMPLICIT_DECL (name)
1895 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1896 && !DECL_IN_SYSTEM_HEADER (x))
1897 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1903 int declared_global;
1905 /* Don't type check externs here when -traditional. This is so that
1906 code with conflicting declarations inside blocks will get warnings
1907 not errors. X11 for instance depends on this. */
1908 if (DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
1909 t = lookup_name_current_level_global (name);
1911 t = lookup_name_current_level (name);
1912 if (t != 0 && t == error_mark_node)
1913 /* error_mark_node is 0 for a while during initialization! */
1916 error_with_decl (x, "`%s' used prior to declaration");
1921 file = DECL_SOURCE_FILE (t);
1922 line = DECL_SOURCE_LINE (t);
1925 /* duplicate_decls might write to TREE_PUBLIC (x) and DECL_EXTERNAL (x)
1926 to make it identical to the initial declaration. */
1927 declared_global = TREE_PUBLIC (x) || DECL_EXTERNAL (x);
1928 if (t != 0 && duplicate_decls (x, t))
1930 if (TREE_CODE (t) == PARM_DECL)
1932 /* Don't allow more than one "real" duplicate
1933 of a forward parm decl. */
1934 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1937 /* If this decl is `static' and an implicit decl was seen previously,
1938 warn. But don't complain if -traditional,
1939 since traditional compilers don't complain. */
1940 if (!flag_traditional && TREE_PUBLIC (name)
1942 /* should this be '&& ! declared_global' ? */
1943 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1945 /* We used to warn also for explicit extern followed by static,
1946 but sometimes you need to do it that way. */
1947 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1949 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1950 IDENTIFIER_POINTER (name));
1951 pedwarn_with_file_and_line (file, line,
1952 "previous declaration of `%s'",
1953 IDENTIFIER_POINTER (name));
1956 /* If this is a global decl, and there exists a conflicting local
1957 decl in a parent block, then we can't return as yet, because we
1958 need to register this decl in the current binding block. */
1959 /* A test for TREE_PUBLIC (x) will fail for variables that have
1960 been declared static first, and extern now. */
1961 if (! declared_global || lookup_name (name) == t)
1965 /* If we are processing a typedef statement, generate a whole new
1966 ..._TYPE node (which will be just an variant of the existing
1967 ..._TYPE node with identical properties) and then install the
1968 TYPE_DECL node generated to represent the typedef name as the
1969 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1971 The whole point here is to end up with a situation where each
1972 and every ..._TYPE node the compiler creates will be uniquely
1973 associated with AT MOST one node representing a typedef name.
1974 This way, even though the compiler substitutes corresponding
1975 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1976 early on, later parts of the compiler can always do the reverse
1977 translation and get back the corresponding typedef name. For
1980 typedef struct S MY_TYPE;
1983 Later parts of the compiler might only know that `object' was of
1984 type `struct S' if if were not for code just below. With this
1985 code however, later parts of the compiler see something like:
1987 struct S' == struct S
1988 typedef struct S' MY_TYPE;
1991 And they can then deduce (from the node for type struct S') that
1992 the original object declaration was:
1996 Being able to do this is important for proper support of protoize,
1997 and also for generating precise symbolic debugging information
1998 which takes full account of the programmer's (typedef) vocabulary.
2000 Obviously, we don't want to generate a duplicate ..._TYPE node if
2001 the TYPE_DECL node that we are now processing really represents a
2002 standard built-in type.
2004 Since all standard types are effectively declared at line zero
2005 in the source file, we can easily check to see if we are working
2006 on a standard type by checking the current value of lineno. */
2008 if (TREE_CODE (x) == TYPE_DECL)
2010 if (DECL_SOURCE_LINE (x) == 0)
2012 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2013 TYPE_NAME (TREE_TYPE (x)) = x;
2015 else if (TREE_TYPE (x) != error_mark_node)
2017 tree tt = TREE_TYPE (x);
2019 tt = build_type_copy (tt);
2025 /* Multiple external decls of the same identifier ought to match.
2026 Check against both global declarations (when traditional) and out of
2027 scope (limbo) block level declarations.
2029 We get warnings about inline functions where they are defined.
2030 Avoid duplicate warnings where they are used. */
2031 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2035 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2036 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2037 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2038 decl = IDENTIFIER_GLOBAL_VALUE (name);
2039 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2040 /* Decls in limbo are always extern, so no need to check that. */
2041 decl = IDENTIFIER_LIMBO_VALUE (name);
2045 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2046 /* If old decl is built-in, we already warned if we should. */
2047 && !DECL_BUILT_IN (decl))
2049 pedwarn_with_decl (x,
2050 "type mismatch with previous external decl");
2051 pedwarn_with_decl (decl, "previous external decl of `%s'");
2055 /* If a function has had an implicit declaration, and then is defined,
2056 make sure they are compatible. */
2058 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2059 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2060 && TREE_CODE (x) == FUNCTION_DECL
2061 && ! comptypes (TREE_TYPE (x),
2062 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2064 warning_with_decl (x, "type mismatch with previous implicit declaration");
2065 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2066 "previous implicit declaration of `%s'");
2069 /* In PCC-compatibility mode, extern decls of vars with no current decl
2070 take effect at top level no matter where they are. */
2071 if (flag_traditional && DECL_EXTERNAL (x)
2072 && lookup_name (name) == 0)
2074 tree type = TREE_TYPE (x);
2076 /* But don't do this if the type contains temporary nodes. */
2079 if (type == error_mark_node)
2081 if (! TREE_PERMANENT (type))
2083 warning_with_decl (x, "type of external `%s' is not global");
2084 /* By exiting the loop early, we leave TYPE nonzero,
2085 and thus prevent globalization of the decl. */
2088 else if (TREE_CODE (type) == FUNCTION_TYPE
2089 && TYPE_ARG_TYPES (type) != 0)
2090 /* The types might not be truly local,
2091 but the list of arg types certainly is temporary.
2092 Since prototypes are nontraditional,
2093 ok not to do the traditional thing. */
2095 type = TREE_TYPE (type);
2099 b = global_binding_level;
2102 /* This name is new in its binding level.
2103 Install the new declaration and return it. */
2104 if (b == global_binding_level)
2106 /* Install a global value. */
2108 /* If the first global decl has external linkage,
2109 warn if we later see static one. */
2110 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2111 TREE_PUBLIC (name) = 1;
2113 IDENTIFIER_GLOBAL_VALUE (name) = x;
2115 /* We no longer care about any previous block level declarations. */
2116 IDENTIFIER_LIMBO_VALUE (name) = 0;
2118 /* Don't forget if the function was used via an implicit decl. */
2119 if (IDENTIFIER_IMPLICIT_DECL (name)
2120 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2121 TREE_USED (x) = 1, TREE_USED (name) = 1;
2123 /* Don't forget if its address was taken in that way. */
2124 if (IDENTIFIER_IMPLICIT_DECL (name)
2125 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2126 TREE_ADDRESSABLE (x) = 1;
2128 /* Warn about mismatches against previous implicit decl. */
2129 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2130 /* If this real decl matches the implicit, don't complain. */
2131 && ! (TREE_CODE (x) == FUNCTION_DECL
2132 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2133 == integer_type_node)))
2134 pedwarn ("`%s' was previously implicitly declared to return `int'",
2135 IDENTIFIER_POINTER (name));
2137 /* If this decl is `static' and an `extern' was seen previously,
2138 that is erroneous. */
2139 if (TREE_PUBLIC (name)
2140 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2142 /* Okay to redeclare an ANSI built-in as static. */
2143 if (t != 0 && DECL_BUILT_IN (t))
2145 /* Okay to declare a non-ANSI built-in as anything. */
2146 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2148 else if (IDENTIFIER_IMPLICIT_DECL (name))
2149 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2150 IDENTIFIER_POINTER (name));
2152 pedwarn ("`%s' was declared `extern' and later `static'",
2153 IDENTIFIER_POINTER (name));
2158 /* Here to install a non-global value. */
2159 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2160 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2161 IDENTIFIER_LOCAL_VALUE (name) = x;
2163 /* If this is an extern function declaration, see if we
2164 have a global definition or declaration for the function. */
2166 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2168 && TREE_CODE (x) == FUNCTION_DECL
2169 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2171 /* We have one. Their types must agree. */
2172 if (! comptypes (TREE_TYPE (x),
2173 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2174 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2177 /* Inner extern decl is inline if global one is.
2178 Copy enough to really inline it. */
2179 if (DECL_INLINE (oldglobal))
2181 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2182 DECL_INITIAL (x) = (current_function_decl == oldglobal
2183 ? 0 : DECL_INITIAL (oldglobal));
2184 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2185 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2186 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2187 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2188 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2189 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2191 /* Inner extern decl is built-in if global one is. */
2192 if (DECL_BUILT_IN (oldglobal))
2194 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2195 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2197 /* Keep the arg types from a file-scope fcn defn. */
2198 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2199 && DECL_INITIAL (oldglobal)
2200 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2201 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2205 #if 0 /* This case is probably sometimes the right thing to do. */
2206 /* If we have a local external declaration,
2207 then any file-scope declaration should not
2208 have been static. */
2209 if (oldlocal == 0 && oldglobal != 0
2210 && !TREE_PUBLIC (oldglobal)
2211 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2212 warning ("`%s' locally external but globally static",
2213 IDENTIFIER_POINTER (name));
2216 /* If we have a local external declaration,
2217 and no file-scope declaration has yet been seen,
2218 then if we later have a file-scope decl it must not be static. */
2221 && DECL_EXTERNAL (x)
2224 TREE_PUBLIC (name) = 1;
2226 /* Save this decl, so that we can do type checking against
2227 other decls after it falls out of scope.
2229 Only save it once. This prevents temporary decls created in
2230 expand_inline_function from being used here, since this
2231 will have been set when the inline function was parsed.
2232 It also helps give slightly better warnings. */
2233 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2234 IDENTIFIER_LIMBO_VALUE (name) = x;
2237 /* Warn if shadowing an argument at the top level of the body. */
2238 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2239 /* This warning doesn't apply to the parms of a nested fcn. */
2240 && ! current_binding_level->parm_flag
2241 /* Check that this is one level down from the parms. */
2242 && current_binding_level->level_chain->parm_flag
2243 /* Check that the decl being shadowed
2244 comes from the parm level, one level up. */
2245 && chain_member (oldlocal, current_binding_level->level_chain->names))
2247 if (TREE_CODE (oldlocal) == PARM_DECL)
2248 pedwarn ("declaration of `%s' shadows a parameter",
2249 IDENTIFIER_POINTER (name));
2251 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2252 IDENTIFIER_POINTER (name));
2255 /* Maybe warn if shadowing something else. */
2256 else if (warn_shadow && !DECL_EXTERNAL (x)
2257 /* No shadow warnings for internally generated vars. */
2258 && DECL_SOURCE_LINE (x) != 0
2259 /* No shadow warnings for vars made for inlining. */
2260 && ! DECL_FROM_INLINE (x))
2262 char *warnstring = 0;
2264 if (TREE_CODE (x) == PARM_DECL
2265 && current_binding_level->level_chain->parm_flag)
2266 /* Don't warn about the parm names in function declarator
2267 within a function declarator.
2268 It would be nice to avoid warning in any function
2269 declarator in a declaration, as opposed to a definition,
2270 but there is no way to tell it's not a definition. */
2272 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2273 warnstring = "declaration of `%s' shadows a parameter";
2274 else if (oldlocal != 0)
2275 warnstring = "declaration of `%s' shadows previous local";
2276 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2277 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2278 warnstring = "declaration of `%s' shadows global declaration";
2281 warning (warnstring, IDENTIFIER_POINTER (name));
2284 /* If storing a local value, there may already be one (inherited).
2285 If so, record it for restoration when this binding level ends. */
2287 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2290 /* Keep count of variables in this level with incomplete type. */
2291 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2295 /* Put decls on list in reverse order.
2296 We will reverse them later if necessary. */
2297 TREE_CHAIN (x) = b->names;
2303 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2306 pushdecl_top_level (x)
2310 register struct binding_level *b = current_binding_level;
2312 current_binding_level = global_binding_level;
2314 current_binding_level = b;
2318 /* Generate an implicit declaration for identifier FUNCTIONID
2319 as a function of type int (). Print a warning if appropriate. */
2322 implicitly_declare (functionid)
2326 int traditional_warning = 0;
2327 /* Only one "implicit declaration" warning per identifier. */
2328 int implicit_warning;
2330 /* Save the decl permanently so we can warn if definition follows. */
2331 push_obstacks_nochange ();
2332 end_temporary_allocation ();
2334 /* We used to reuse an old implicit decl here,
2335 but this loses with inline functions because it can clobber
2336 the saved decl chains. */
2337 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2338 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2340 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2342 /* Warn of implicit decl following explicit local extern decl.
2343 This is probably a program designed for traditional C. */
2344 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2345 traditional_warning = 1;
2347 /* Warn once of an implicit declaration. */
2348 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2350 DECL_EXTERNAL (decl) = 1;
2351 TREE_PUBLIC (decl) = 1;
2353 /* Record that we have an implicit decl and this is it. */
2354 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2356 /* ANSI standard says implicit declarations are in the innermost block.
2357 So we record the decl in the standard fashion.
2358 If flag_traditional is set, pushdecl does it top-level. */
2361 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2362 maybe_objc_check_decl (decl);
2364 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2366 if (warn_implicit && implicit_warning)
2367 warning ("implicit declaration of function `%s'",
2368 IDENTIFIER_POINTER (functionid));
2369 else if (warn_traditional && traditional_warning)
2370 warning ("function `%s' was previously declared within a block",
2371 IDENTIFIER_POINTER (functionid));
2373 /* Write a record describing this implicit function declaration to the
2374 prototypes file (if requested). */
2376 gen_aux_info_record (decl, 0, 1, 0);
2383 /* Return zero if the declaration NEWDECL is valid
2384 when the declaration OLDDECL (assumed to be for the same name)
2385 has already been seen.
2386 Otherwise return an error message format string with a %s
2387 where the identifier should go. */
2390 redeclaration_error_message (newdecl, olddecl)
2391 tree newdecl, olddecl;
2393 if (TREE_CODE (newdecl) == TYPE_DECL)
2395 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2397 /* pushdecl creates distinct types for TYPE_DECLs by calling
2398 build_type_copy, so the above comparison generally fails. We do
2399 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2400 is equivalent to what this code used to do before the build_type_copy
2401 call. The variant type distinction should not matter for traditional
2402 code, because it doesn't have type qualifiers. */
2403 if (flag_traditional
2404 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2406 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2408 return "redefinition of `%s'";
2410 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2412 /* Declarations of functions can insist on internal linkage
2413 but they can't be inconsistent with internal linkage,
2414 so there can be no error on that account.
2415 However defining the same name twice is no good. */
2416 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2417 /* However, defining once as extern inline and a second
2418 time in another way is ok. */
2419 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2420 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2421 return "redefinition of `%s'";
2424 else if (current_binding_level == global_binding_level)
2426 /* Objects declared at top level: */
2427 /* If at least one is a reference, it's ok. */
2428 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2430 /* Reject two definitions. */
2431 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2432 return "redefinition of `%s'";
2433 /* Now we have two tentative defs, or one tentative and one real def. */
2434 /* Insist that the linkage match. */
2435 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2436 return "conflicting declarations of `%s'";
2439 else if (current_binding_level->parm_flag
2440 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2444 /* Newdecl has block scope. If olddecl has block scope also, then
2445 reject two definitions, and reject a definition together with an
2446 external reference. Otherwise, it is OK, because newdecl must
2447 be an extern reference to olddecl. */
2448 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2449 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2450 return "redeclaration of `%s'";
2455 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2456 Create one if none exists so far for the current function.
2457 This function is called for both label definitions and label references. */
2463 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2465 if (current_function_decl == 0)
2467 error ("label %s referenced outside of any function",
2468 IDENTIFIER_POINTER (id));
2472 /* Use a label already defined or ref'd with this name. */
2475 /* But not if it is inherited and wasn't declared to be inheritable. */
2476 if (DECL_CONTEXT (decl) != current_function_decl
2477 && ! C_DECLARED_LABEL_FLAG (decl))
2478 return shadow_label (id);
2482 decl = build_decl (LABEL_DECL, id, void_type_node);
2484 /* Make sure every label has an rtx. */
2487 /* A label not explicitly declared must be local to where it's ref'd. */
2488 DECL_CONTEXT (decl) = current_function_decl;
2490 DECL_MODE (decl) = VOIDmode;
2492 /* Say where one reference is to the label,
2493 for the sake of the error if it is not defined. */
2494 DECL_SOURCE_LINE (decl) = lineno;
2495 DECL_SOURCE_FILE (decl) = input_filename;
2497 IDENTIFIER_LABEL_VALUE (id) = decl;
2499 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2504 /* Make a label named NAME in the current function,
2505 shadowing silently any that may be inherited from containing functions
2506 or containing scopes.
2508 Note that valid use, if the label being shadowed
2509 comes from another scope in the same function,
2510 requires calling declare_nonlocal_label right away. */
2516 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2522 /* Check to make sure that the label hasn't already been declared
2523 at this label scope */
2524 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2525 if (TREE_VALUE (dup) == decl)
2527 error ("duplicate label declaration `%s'",
2528 IDENTIFIER_POINTER (name));
2529 error_with_decl (TREE_VALUE (dup),
2530 "this is a previous declaration");
2531 /* Just use the previous declaration. */
2532 return lookup_label (name);
2535 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2536 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2539 return lookup_label (name);
2542 /* Define a label, specifying the location in the source file.
2543 Return the LABEL_DECL node for the label, if the definition is valid.
2544 Otherwise return 0. */
2547 define_label (filename, line, name)
2552 tree decl = lookup_label (name);
2554 /* If label with this name is known from an outer context, shadow it. */
2555 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2557 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2558 IDENTIFIER_LABEL_VALUE (name) = 0;
2559 decl = lookup_label (name);
2562 if (DECL_INITIAL (decl) != 0)
2564 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2569 /* Mark label as having been defined. */
2570 DECL_INITIAL (decl) = error_mark_node;
2571 /* Say where in the source. */
2572 DECL_SOURCE_FILE (decl) = filename;
2573 DECL_SOURCE_LINE (decl) = line;
2578 /* Return the list of declarations of the current level.
2579 Note that this list is in reverse order unless/until
2580 you nreverse it; and when you do nreverse it, you must
2581 store the result back using `storedecls' or you will lose. */
2586 return current_binding_level->names;
2589 /* Return the list of type-tags (for structs, etc) of the current level. */
2594 return current_binding_level->tags;
2597 /* Store the list of declarations of the current level.
2598 This is done for the parameter declarations of a function being defined,
2599 after they are modified in the light of any missing parameters. */
2605 current_binding_level->names = decls;
2608 /* Similarly, store the list of tags of the current level. */
2614 current_binding_level->tags = tags;
2617 /* Given NAME, an IDENTIFIER_NODE,
2618 return the structure (or union or enum) definition for that name.
2619 Searches binding levels from BINDING_LEVEL up to the global level.
2620 If THISLEVEL_ONLY is nonzero, searches only the specified context
2621 (but skips any tag-transparent contexts to find one that is
2622 meaningful for tags).
2623 CODE says which kind of type the caller wants;
2624 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2625 If the wrong kind of type is found, an error is reported. */
2628 lookup_tag (code, name, binding_level, thislevel_only)
2629 enum tree_code code;
2630 struct binding_level *binding_level;
2634 register struct binding_level *level;
2636 for (level = binding_level; level; level = level->level_chain)
2639 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2641 if (TREE_PURPOSE (tail) == name)
2643 if (TREE_CODE (TREE_VALUE (tail)) != code)
2645 /* Definition isn't the kind we were looking for. */
2646 pending_invalid_xref = name;
2647 pending_invalid_xref_file = input_filename;
2648 pending_invalid_xref_line = lineno;
2650 return TREE_VALUE (tail);
2653 if (thislevel_only && ! level->tag_transparent)
2659 /* Print an error message now
2660 for a recent invalid struct, union or enum cross reference.
2661 We don't print them immediately because they are not invalid
2662 when used in the `struct foo;' construct for shadowing. */
2665 pending_xref_error ()
2667 if (pending_invalid_xref != 0)
2668 error_with_file_and_line (pending_invalid_xref_file,
2669 pending_invalid_xref_line,
2670 "`%s' defined as wrong kind of tag",
2671 IDENTIFIER_POINTER (pending_invalid_xref));
2672 pending_invalid_xref = 0;
2675 /* Given a type, find the tag that was defined for it and return the tag name.
2676 Otherwise return 0. */
2679 lookup_tag_reverse (type)
2682 register struct binding_level *level;
2684 for (level = current_binding_level; level; level = level->level_chain)
2687 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2689 if (TREE_VALUE (tail) == type)
2690 return TREE_PURPOSE (tail);
2696 /* Look up NAME in the current binding level and its superiors
2697 in the namespace of variables, functions and typedefs.
2698 Return a ..._DECL node of some kind representing its definition,
2699 or return 0 if it is undefined. */
2706 if (current_binding_level != global_binding_level
2707 && IDENTIFIER_LOCAL_VALUE (name))
2708 val = IDENTIFIER_LOCAL_VALUE (name);
2710 val = IDENTIFIER_GLOBAL_VALUE (name);
2714 /* Similar to `lookup_name' but look only at current binding level. */
2717 lookup_name_current_level (name)
2722 if (current_binding_level == global_binding_level)
2723 return IDENTIFIER_GLOBAL_VALUE (name);
2725 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2728 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2729 if (DECL_NAME (t) == name)
2735 /* Similar to `lookup_name_current_level' but also look at the global binding
2739 lookup_name_current_level_global (name)
2742 register tree t = 0;
2744 if (current_binding_level == global_binding_level)
2745 return IDENTIFIER_GLOBAL_VALUE (name);
2747 if (IDENTIFIER_LOCAL_VALUE (name) != 0)
2748 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2749 if (DECL_NAME (t) == name)
2753 t = IDENTIFIER_GLOBAL_VALUE (name);
2758 /* Create the predefined scalar types of C,
2759 and some nodes representing standard constants (0, 1, (void *)0).
2760 Initialize the global binding level.
2761 Make definitions for built-in primitive functions. */
2764 init_decl_processing ()
2766 register tree endlink;
2767 /* Either char* or void*. */
2768 tree traditional_ptr_type_node;
2769 /* Data types of memcpy and strlen. */
2770 tree memcpy_ftype, strlen_ftype;
2771 tree void_ftype_any;
2772 int wchar_type_size;
2774 tree array_domain_type;
2776 current_function_decl = NULL;
2777 named_labels = NULL;
2778 current_binding_level = NULL_BINDING_LEVEL;
2779 free_binding_level = NULL_BINDING_LEVEL;
2780 pushlevel (0); /* make the binding_level structure for global names */
2781 global_binding_level = current_binding_level;
2783 /* Define `int' and `char' first so that dbx will output them first. */
2785 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2786 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2787 integer_type_node));
2789 /* Define `char', which is like either `signed char' or `unsigned char'
2790 but not the same as either. */
2794 ? make_signed_type (CHAR_TYPE_SIZE)
2795 : make_unsigned_type (CHAR_TYPE_SIZE));
2796 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2799 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2800 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2801 long_integer_type_node));
2803 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2804 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2805 unsigned_type_node));
2807 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2808 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2809 long_unsigned_type_node));
2811 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2812 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2813 long_long_integer_type_node));
2815 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2816 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2817 long_long_unsigned_type_node));
2819 /* `unsigned long' is the standard type for sizeof.
2820 Traditionally, use a signed type.
2821 Note that stddef.h uses `unsigned long',
2822 and this must agree, even of long and int are the same size. */
2824 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2825 if (flag_traditional && TREE_UNSIGNED (sizetype))
2826 sizetype = signed_type (sizetype);
2829 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2831 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2832 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2833 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2834 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2835 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2836 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2837 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2839 error_mark_node = make_node (ERROR_MARK);
2840 TREE_TYPE (error_mark_node) = error_mark_node;
2842 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2843 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2844 short_integer_type_node));
2846 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2847 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2848 short_unsigned_type_node));
2850 /* Define both `signed char' and `unsigned char'. */
2851 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2852 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2853 signed_char_type_node));
2855 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2856 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2857 unsigned_char_type_node));
2859 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2860 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2862 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2863 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2865 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2866 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2868 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2869 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2871 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2872 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2874 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2875 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2877 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2878 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2880 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2881 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2883 float_type_node = make_node (REAL_TYPE);
2884 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2885 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2887 layout_type (float_type_node);
2889 double_type_node = make_node (REAL_TYPE);
2890 if (flag_short_double)
2891 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2893 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2894 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2896 layout_type (double_type_node);
2898 long_double_type_node = make_node (REAL_TYPE);
2899 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2900 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2901 long_double_type_node));
2902 layout_type (long_double_type_node);
2904 complex_integer_type_node = make_node (COMPLEX_TYPE);
2905 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2906 complex_integer_type_node));
2907 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2908 layout_type (complex_integer_type_node);
2910 complex_float_type_node = make_node (COMPLEX_TYPE);
2911 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2912 complex_float_type_node));
2913 TREE_TYPE (complex_float_type_node) = float_type_node;
2914 layout_type (complex_float_type_node);
2916 complex_double_type_node = make_node (COMPLEX_TYPE);
2917 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2918 complex_double_type_node));
2919 TREE_TYPE (complex_double_type_node) = double_type_node;
2920 layout_type (complex_double_type_node);
2922 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2923 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2924 complex_long_double_type_node));
2925 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2926 layout_type (complex_long_double_type_node);
2929 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2930 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2931 signed_wchar_type_node = signed_type (wchar_type_node);
2932 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2934 integer_zero_node = build_int_2 (0, 0);
2935 TREE_TYPE (integer_zero_node) = integer_type_node;
2936 integer_one_node = build_int_2 (1, 0);
2937 TREE_TYPE (integer_one_node) = integer_type_node;
2939 boolean_type_node = integer_type_node;
2940 boolean_true_node = integer_one_node;
2941 boolean_false_node = integer_zero_node;
2943 size_zero_node = build_int_2 (0, 0);
2944 TREE_TYPE (size_zero_node) = sizetype;
2945 size_one_node = build_int_2 (1, 0);
2946 TREE_TYPE (size_one_node) = sizetype;
2948 void_type_node = make_node (VOID_TYPE);
2949 pushdecl (build_decl (TYPE_DECL,
2950 ridpointers[(int) RID_VOID], void_type_node));
2951 layout_type (void_type_node); /* Uses integer_zero_node */
2952 /* We are not going to have real types in C with less than byte alignment,
2953 so we might as well not have any types that claim to have it. */
2954 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2956 null_pointer_node = build_int_2 (0, 0);
2957 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2958 layout_type (TREE_TYPE (null_pointer_node));
2960 string_type_node = build_pointer_type (char_type_node);
2961 const_string_type_node
2962 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2964 /* Make a type to be the domain of a few array types
2965 whose domains don't really matter.
2966 200 is small enough that it always fits in size_t
2967 and large enough that it can hold most function names for the
2968 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2969 array_domain_type = build_index_type (build_int_2 (200, 0));
2971 /* make a type for arrays of characters.
2972 With luck nothing will ever really depend on the length of this
2974 char_array_type_node
2975 = build_array_type (char_type_node, array_domain_type);
2976 /* Likewise for arrays of ints. */
2978 = build_array_type (integer_type_node, array_domain_type);
2979 /* This is for wide string constants. */
2980 wchar_array_type_node
2981 = build_array_type (wchar_type_node, array_domain_type);
2983 default_function_type
2984 = build_function_type (integer_type_node, NULL_TREE);
2986 ptr_type_node = build_pointer_type (void_type_node);
2988 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2990 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2993 = build_function_type (void_type_node, NULL_TREE);
2996 = build_function_type (float_type_node,
2997 tree_cons (NULL_TREE, float_type_node, endlink));
3000 = build_function_type (double_type_node,
3001 tree_cons (NULL_TREE, double_type_node, endlink));
3003 ldouble_ftype_ldouble
3004 = build_function_type (long_double_type_node,
3005 tree_cons (NULL_TREE, long_double_type_node,
3008 double_ftype_double_double
3009 = build_function_type (double_type_node,
3010 tree_cons (NULL_TREE, double_type_node,
3011 tree_cons (NULL_TREE,
3012 double_type_node, endlink)));
3015 = build_function_type (integer_type_node,
3016 tree_cons (NULL_TREE, integer_type_node, endlink));
3019 = build_function_type (long_integer_type_node,
3020 tree_cons (NULL_TREE,
3021 long_integer_type_node, endlink));
3023 void_ftype_ptr_ptr_int
3024 = build_function_type (void_type_node,
3025 tree_cons (NULL_TREE, ptr_type_node,
3026 tree_cons (NULL_TREE, ptr_type_node,
3027 tree_cons (NULL_TREE,
3031 int_ftype_cptr_cptr_sizet
3032 = build_function_type (integer_type_node,
3033 tree_cons (NULL_TREE, const_ptr_type_node,
3034 tree_cons (NULL_TREE, const_ptr_type_node,
3035 tree_cons (NULL_TREE,
3039 void_ftype_ptr_int_int
3040 = build_function_type (void_type_node,
3041 tree_cons (NULL_TREE, ptr_type_node,
3042 tree_cons (NULL_TREE, integer_type_node,
3043 tree_cons (NULL_TREE,
3047 string_ftype_ptr_ptr /* strcpy prototype */
3048 = build_function_type (string_type_node,
3049 tree_cons (NULL_TREE, string_type_node,
3050 tree_cons (NULL_TREE,
3051 const_string_type_node,
3054 int_ftype_string_string /* strcmp prototype */
3055 = build_function_type (integer_type_node,
3056 tree_cons (NULL_TREE, const_string_type_node,
3057 tree_cons (NULL_TREE,
3058 const_string_type_node,
3061 strlen_ftype /* strlen prototype */
3062 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3063 tree_cons (NULL_TREE, const_string_type_node,
3066 traditional_ptr_type_node
3067 = (flag_traditional ? string_type_node : ptr_type_node);
3069 memcpy_ftype /* memcpy prototype */
3070 = build_function_type (traditional_ptr_type_node,
3071 tree_cons (NULL_TREE, ptr_type_node,
3072 tree_cons (NULL_TREE, const_ptr_type_node,
3073 tree_cons (NULL_TREE,
3077 builtin_function ("__builtin_constant_p", default_function_type,
3078 BUILT_IN_CONSTANT_P, NULL_PTR);
3080 builtin_function ("__builtin_return_address",
3081 build_function_type (ptr_type_node,
3082 tree_cons (NULL_TREE,
3085 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3087 builtin_function ("__builtin_frame_address",
3088 build_function_type (ptr_type_node,
3089 tree_cons (NULL_TREE,
3092 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3094 builtin_function ("__builtin_alloca",
3095 build_function_type (ptr_type_node,
3096 tree_cons (NULL_TREE,
3099 BUILT_IN_ALLOCA, "alloca");
3100 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3101 /* Define alloca, ffs as builtins.
3102 Declare _exit just to mark it as volatile. */
3103 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3105 temp = builtin_function ("alloca",
3106 build_function_type (ptr_type_node,
3107 tree_cons (NULL_TREE,
3110 BUILT_IN_ALLOCA, NULL_PTR);
3111 /* Suppress error if redefined as a non-function. */
3112 DECL_BUILT_IN_NONANSI (temp) = 1;
3113 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3114 /* Suppress error if redefined as a non-function. */
3115 DECL_BUILT_IN_NONANSI (temp) = 1;
3116 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3118 TREE_THIS_VOLATILE (temp) = 1;
3119 TREE_SIDE_EFFECTS (temp) = 1;
3120 /* Suppress error if redefined as a non-function. */
3121 DECL_BUILT_IN_NONANSI (temp) = 1;
3124 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3125 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3127 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3129 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3131 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3133 builtin_function ("__builtin_saveregs",
3134 build_function_type (ptr_type_node, NULL_TREE),
3135 BUILT_IN_SAVEREGS, NULL_PTR);
3136 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3138 builtin_function ("__builtin_varargs",
3139 build_function_type (ptr_type_node,
3140 tree_cons (NULL_TREE,
3143 BUILT_IN_VARARGS, NULL_PTR);
3145 builtin_function ("__builtin_classify_type", default_function_type,
3146 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3147 builtin_function ("__builtin_next_arg",
3148 build_function_type (ptr_type_node, NULL_TREE),
3149 BUILT_IN_NEXT_ARG, NULL_PTR);
3150 builtin_function ("__builtin_args_info",
3151 build_function_type (integer_type_node,
3152 tree_cons (NULL_TREE,
3155 BUILT_IN_ARGS_INFO, NULL_PTR);
3157 /* Untyped call and return. */
3158 builtin_function ("__builtin_apply_args",
3159 build_function_type (ptr_type_node, NULL_TREE),
3160 BUILT_IN_APPLY_ARGS, NULL_PTR);
3162 temp = tree_cons (NULL_TREE,
3163 build_pointer_type (build_function_type (void_type_node,
3165 tree_cons (NULL_TREE,
3167 tree_cons (NULL_TREE,
3170 builtin_function ("__builtin_apply",
3171 build_function_type (ptr_type_node, temp),
3172 BUILT_IN_APPLY, NULL_PTR);
3173 builtin_function ("__builtin_return",
3174 build_function_type (void_type_node,
3175 tree_cons (NULL_TREE,
3178 BUILT_IN_RETURN, NULL_PTR);
3180 /* Currently under experimentation. */
3181 builtin_function ("__builtin_memcpy", memcpy_ftype,
3182 BUILT_IN_MEMCPY, "memcpy");
3183 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3184 BUILT_IN_MEMCMP, "memcmp");
3185 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3186 BUILT_IN_STRCMP, "strcmp");
3187 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3188 BUILT_IN_STRCPY, "strcpy");
3189 builtin_function ("__builtin_strlen", strlen_ftype,
3190 BUILT_IN_STRLEN, "strlen");
3191 builtin_function ("__builtin_sqrtf", float_ftype_float,
3192 BUILT_IN_FSQRT, "sqrtf");
3193 builtin_function ("__builtin_fsqrt", double_ftype_double,
3194 BUILT_IN_FSQRT, "sqrt");
3195 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3196 BUILT_IN_FSQRT, "sqrtl");
3197 builtin_function ("__builtin_sinf", float_ftype_float,
3198 BUILT_IN_SIN, "sinf");
3199 builtin_function ("__builtin_sin", double_ftype_double,
3200 BUILT_IN_SIN, "sin");
3201 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3202 BUILT_IN_SIN, "sinl");
3203 builtin_function ("__builtin_cosf", float_ftype_float,
3204 BUILT_IN_COS, "cosf");
3205 builtin_function ("__builtin_cos", double_ftype_double,
3206 BUILT_IN_COS, "cos");
3207 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3208 BUILT_IN_COS, "cosl");
3210 /* In an ANSI C program, it is okay to supply built-in meanings
3211 for these functions, since applications cannot validly use them
3212 with any other meaning.
3213 However, honor the -fno-builtin option. */
3214 if (!flag_no_builtin)
3216 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3217 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3218 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3219 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3221 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3222 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3223 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3225 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3227 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3229 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3230 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3231 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3232 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3234 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3235 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3236 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3237 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3238 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3239 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3241 /* Declare these functions volatile
3242 to avoid spurious "control drops through" warnings. */
3243 /* Don't specify the argument types, to avoid errors
3244 from certain code which isn't valid in ANSI but which exists. */
3245 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3247 TREE_THIS_VOLATILE (temp) = 1;
3248 TREE_SIDE_EFFECTS (temp) = 1;
3249 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3250 TREE_THIS_VOLATILE (temp) = 1;
3251 TREE_SIDE_EFFECTS (temp) = 1;
3255 /* Support for these has not been written in either expand_builtin
3256 or build_function_call. */
3257 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3258 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3259 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3261 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3263 builtin_function ("__builtin_fmod", double_ftype_double_double,
3264 BUILT_IN_FMOD, NULL_PTR);
3265 builtin_function ("__builtin_frem", double_ftype_double_double,
3266 BUILT_IN_FREM, NULL_PTR);
3267 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3268 BUILT_IN_MEMSET, NULL_PTR);
3269 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3271 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3275 pedantic_lvalues = pedantic;
3277 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3278 declare_function_name ();
3280 start_identifier_warnings ();
3282 /* Prepare to check format strings against argument lists. */
3283 init_function_format_info ();
3287 incomplete_decl_finalize_hook = finish_incomplete_decl;
3290 /* Return a definition for a builtin function named NAME and whose data type
3291 is TYPE. TYPE should be a function type with argument types.
3292 FUNCTION_CODE tells later passes how to compile calls to this function.
3293 See tree.h for its possible values.
3295 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3296 the name to be called if we can't opencode the function. */
3299 builtin_function (name, type, function_code, library_name)
3302 enum built_in_function function_code;
3305 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3306 DECL_EXTERNAL (decl) = 1;
3307 TREE_PUBLIC (decl) = 1;
3308 /* If -traditional, permit redefining a builtin function any way you like.
3309 (Though really, if the program redefines these functions,
3310 it probably won't work right unless compiled with -fno-builtin.) */
3311 if (flag_traditional && name[0] != '_')
3312 DECL_BUILT_IN_NONANSI (decl) = 1;
3314 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3315 make_decl_rtl (decl, NULL_PTR, 1);
3317 if (function_code != NOT_BUILT_IN)
3319 DECL_BUILT_IN (decl) = 1;
3320 DECL_FUNCTION_CODE (decl) = function_code;
3322 /* Warn if a function in the namespace for users
3323 is used without an occasion to consider it declared. */
3324 if (name[0] != '_' || name[1] != '_')
3325 C_DECL_ANTICIPATED (decl) = 1;
3330 /* Called when a declaration is seen that contains no names to declare.
3331 If its type is a reference to a structure, union or enum inherited
3332 from a containing scope, shadow that tag name for the current scope
3333 with a forward reference.
3334 If its type defines a new named structure or union
3335 or defines an enum, it is valid but we need not do anything here.
3336 Otherwise, it is an error. */
3339 shadow_tag (declspecs)
3342 shadow_tag_warned (declspecs, 0);
3346 shadow_tag_warned (declspecs, warned)
3349 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3355 pending_invalid_xref = 0;
3357 for (link = declspecs; link; link = TREE_CHAIN (link))
3359 register tree value = TREE_VALUE (link);
3360 register enum tree_code code = TREE_CODE (value);
3362 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3363 /* Used to test also that TYPE_SIZE (value) != 0.
3364 That caused warning for `struct foo;' at top level in the file. */
3366 register tree name = lookup_tag_reverse (value);
3373 if (warned != 1 && code != ENUMERAL_TYPE)
3374 /* Empty unnamed enum OK */
3376 pedwarn ("unnamed struct/union that defines no instances");
3382 t = lookup_tag (code, name, current_binding_level, 1);
3386 t = make_node (code);
3393 if (!warned && ! in_system_header)
3395 warning ("useless keyword or type name in empty declaration");
3402 error ("two types specified in one empty declaration");
3407 pedwarn ("empty declaration");
3411 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3414 groktypename (typename)
3417 if (TREE_CODE (typename) != TREE_LIST)
3419 return grokdeclarator (TREE_VALUE (typename),
3420 TREE_PURPOSE (typename),
3424 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3427 groktypename_in_parm_context (typename)
3430 if (TREE_CODE (typename) != TREE_LIST)
3432 return grokdeclarator (TREE_VALUE (typename),
3433 TREE_PURPOSE (typename),
3437 /* Decode a declarator in an ordinary declaration or data definition.
3438 This is called as soon as the type information and variable name
3439 have been parsed, before parsing the initializer if any.
3440 Here we create the ..._DECL node, fill in its type,
3441 and put it on the list of decls for the current context.
3442 The ..._DECL node is returned as the value.
3444 Exception: for arrays where the length is not specified,
3445 the type is left null, to be filled in by `finish_decl'.
3447 Function definitions do not come here; they go to start_function
3448 instead. However, external and forward declarations of functions
3449 do go through here. Structure field declarations are done by
3450 grokfield and not through here. */
3452 /* Set this to zero to debug not using the temporary obstack
3453 to parse initializers. */
3454 int debug_temp_inits = 1;
3457 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3458 tree declarator, declspecs;
3460 tree attributes, prefix_attributes;
3462 register tree decl = grokdeclarator (declarator, declspecs,
3463 NORMAL, initialized);
3465 int init_written = initialized;
3467 /* The corresponding pop_obstacks is in finish_decl. */
3468 push_obstacks_nochange ();
3471 /* Is it valid for this decl to have an initializer at all?
3472 If not, set INITIALIZED to zero, which will indirectly
3473 tell `finish_decl' to ignore the initializer once it is parsed. */
3474 switch (TREE_CODE (decl))
3477 /* typedef foo = bar means give foo the same type as bar.
3478 We haven't parsed bar yet, so `finish_decl' will fix that up.
3479 Any other case of an initialization in a TYPE_DECL is an error. */
3480 if (pedantic || list_length (declspecs) > 1)
3482 error ("typedef `%s' is initialized",
3483 IDENTIFIER_POINTER (DECL_NAME (decl)));
3489 error ("function `%s' is initialized like a variable",
3490 IDENTIFIER_POINTER (DECL_NAME (decl)));
3495 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3496 error ("parameter `%s' is initialized",
3497 IDENTIFIER_POINTER (DECL_NAME (decl)));
3502 /* Don't allow initializations for incomplete types
3503 except for arrays which might be completed by the initialization. */
3504 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3506 /* A complete type is ok if size is fixed. */
3508 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3509 || C_DECL_VARIABLE_SIZE (decl))
3511 error ("variable-sized object may not be initialized");
3515 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3517 error ("variable `%s' has initializer but incomplete type",
3518 IDENTIFIER_POINTER (DECL_NAME (decl)));
3521 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3523 error ("elements of array `%s' have incomplete type",
3524 IDENTIFIER_POINTER (DECL_NAME (decl)));
3531 #if 0 /* Seems redundant with grokdeclarator. */
3532 if (current_binding_level != global_binding_level
3533 && DECL_EXTERNAL (decl)
3534 && TREE_CODE (decl) != FUNCTION_DECL)
3535 warning ("declaration of `%s' has `extern' and is initialized",
3536 IDENTIFIER_POINTER (DECL_NAME (decl)));
3538 DECL_EXTERNAL (decl) = 0;
3539 if (current_binding_level == global_binding_level)
3540 TREE_STATIC (decl) = 1;
3542 /* Tell `pushdecl' this is an initialized decl
3543 even though we don't yet have the initializer expression.
3544 Also tell `finish_decl' it may store the real initializer. */
3545 DECL_INITIAL (decl) = error_mark_node;
3548 /* If this is a function declaration, write a record describing it to the
3549 prototypes file (if requested). */
3551 if (TREE_CODE (decl) == FUNCTION_DECL)
3552 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3554 /* For C and Objective-C, we by default put things in .common when
3556 DECL_COMMON (decl) = 1;
3558 /* Set attributes here so if duplicate decl, will have proper attributes. */
3559 decl_attributes (decl, attributes, prefix_attributes);
3561 /* Add this decl to the current binding level.
3562 TEM may equal DECL or it may be a previous decl of the same name. */
3563 tem = pushdecl (decl);
3565 /* For a local variable, define the RTL now. */
3566 if (current_binding_level != global_binding_level
3567 /* But not if this is a duplicate decl
3568 and we preserved the rtl from the previous one
3569 (which may or may not happen). */
3570 && DECL_RTL (tem) == 0)
3572 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3574 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3575 && DECL_INITIAL (tem) != 0)
3581 /* When parsing and digesting the initializer,
3582 use temporary storage. Do this even if we will ignore the value. */
3583 if (current_binding_level == global_binding_level && debug_temp_inits)
3584 temporary_allocation ();
3590 /* Finish processing of a declaration;
3591 install its initial value.
3592 If the length of an array type is not known before,
3593 it must be determined now, from the initial value, or it is an error. */
3596 finish_decl (decl, init, asmspec_tree)
3600 register tree type = TREE_TYPE (decl);
3601 int was_incomplete = (DECL_SIZE (decl) == 0);
3602 int temporary = allocation_temporary_p ();
3605 /* If a name was specified, get the string. */
3607 asmspec = TREE_STRING_POINTER (asmspec_tree);
3609 /* If `start_decl' didn't like having an initialization, ignore it now. */
3611 if (init != 0 && DECL_INITIAL (decl) == 0)
3613 /* Don't crash if parm is initialized. */
3614 if (TREE_CODE (decl) == PARM_DECL)
3617 if (ITERATOR_P (decl))
3620 error_with_decl (decl, "iterator has no initial value");
3622 init = save_expr (init);
3627 if (TREE_CODE (decl) != TYPE_DECL)
3628 store_init_value (decl, init);
3631 /* typedef foo = bar; store the type of bar as the type of foo. */
3632 TREE_TYPE (decl) = TREE_TYPE (init);
3633 DECL_INITIAL (decl) = init = 0;
3637 /* Pop back to the obstack that is current for this binding level.
3638 This is because MAXINDEX, rtl, etc. to be made below
3639 must go in the permanent obstack. But don't discard the
3640 temporary data yet. */
3642 #if 0 /* pop_obstacks was near the end; this is what was here. */
3643 if (current_binding_level == global_binding_level && temporary)
3644 end_temporary_allocation ();
3647 /* Deduce size of array from initialization, if not already known */
3649 if (TREE_CODE (type) == ARRAY_TYPE
3650 && TYPE_DOMAIN (type) == 0
3651 && TREE_CODE (decl) != TYPE_DECL)
3654 = (TREE_STATIC (decl)
3655 /* Even if pedantic, an external linkage array
3656 may have incomplete type at first. */
3657 ? pedantic && !TREE_PUBLIC (decl)
3658 : !DECL_EXTERNAL (decl));
3660 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3662 /* Get the completed type made by complete_array_type. */
3663 type = TREE_TYPE (decl);
3666 error_with_decl (decl, "initializer fails to determine size of `%s'");
3671 error_with_decl (decl, "array size missing in `%s'");
3672 /* If a `static' var's size isn't known,
3673 make it extern as well as static, so it does not get
3675 If it is not `static', then do not mark extern;
3676 finish_incomplete_decl will give it a default size
3677 and it will get allocated. */
3678 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3679 DECL_EXTERNAL (decl) = 1;
3682 /* TYPE_MAX_VALUE is always one less than the number of elements
3683 in the array, because we start counting at zero. Therefore,
3684 warn only if the value is less than zero. */
3685 if (pedantic && TYPE_DOMAIN (type) != 0
3686 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3687 error_with_decl (decl, "zero or negative size array `%s'");
3689 layout_decl (decl, 0);
3692 if (TREE_CODE (decl) == VAR_DECL)
3694 if (DECL_SIZE (decl) == 0
3695 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3696 layout_decl (decl, 0);
3698 if (DECL_SIZE (decl) == 0
3699 && (TREE_STATIC (decl)
3701 /* A static variable with an incomplete type
3702 is an error if it is initialized.
3703 Also if it is not file scope.
3704 Otherwise, let it through, but if it is not `extern'
3705 then it may cause an error message later. */
3706 /* We must use DECL_CONTEXT instead of current_binding_level,
3707 because a duplicate_decls call could have changed the binding
3708 level of this decl. */
3709 (DECL_INITIAL (decl) != 0 || DECL_CONTEXT (decl) != 0)
3711 /* An automatic variable with an incomplete type
3713 !DECL_EXTERNAL (decl)))
3715 error_with_decl (decl, "storage size of `%s' isn't known");
3716 TREE_TYPE (decl) = error_mark_node;
3719 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3720 && DECL_SIZE (decl) != 0)
3722 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3723 constant_expression_warning (DECL_SIZE (decl));
3725 error_with_decl (decl, "storage size of `%s' isn't constant");
3729 /* If this is a function and an assembler name is specified, it isn't
3730 builtin any more. Also reset DECL_RTL so we can give it its new
3732 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3734 DECL_BUILT_IN (decl) = 0;
3735 DECL_RTL (decl) = 0;
3738 /* Output the assembler code and/or RTL code for variables and functions,
3739 unless the type is an undefined structure or union.
3740 If not, it will get done when the type is completed. */
3742 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3744 if ((flag_traditional || TREE_PERMANENT (decl))
3745 && allocation_temporary_p ())
3747 push_obstacks_nochange ();
3748 end_temporary_allocation ();
3749 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3750 maybe_objc_check_decl (decl);
3751 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3757 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3758 maybe_objc_check_decl (decl);
3759 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3762 if (DECL_CONTEXT (decl) != 0)
3764 /* Recompute the RTL of a local array now
3765 if it used to be an incomplete type. */
3767 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3769 /* If we used it already as memory, it must stay in memory. */
3770 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3771 /* If it's still incomplete now, no init will save it. */
3772 if (DECL_SIZE (decl) == 0)
3773 DECL_INITIAL (decl) = 0;
3776 /* Compute and store the initial value. */
3777 if (TREE_CODE (decl) != FUNCTION_DECL)
3778 expand_decl_init (decl);
3782 if (TREE_CODE (decl) == TYPE_DECL)
3784 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3785 maybe_objc_check_decl (decl);
3786 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3790 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3791 /* This test used to include TREE_PERMANENT, however, we have the same
3792 problem with initializers at the function level. Such initializers get
3793 saved until the end of the function on the momentary_obstack. */
3794 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3796 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3797 space with DECL_ARG_TYPE. */
3798 && TREE_CODE (decl) != PARM_DECL)
3800 /* We need to remember that this array HAD an initialization,
3801 but discard the actual temporary nodes,
3802 since we can't have a permanent node keep pointing to them. */
3803 /* We make an exception for inline functions, since it's
3804 normal for a local extern redeclaration of an inline function
3805 to have a copy of the top-level decl's DECL_INLINE. */
3806 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3808 /* If this is a const variable, then preserve the
3809 initializer instead of discarding it so that we can optimize
3810 references to it. */
3811 /* This test used to include TREE_STATIC, but this won't be set
3812 for function level initializers. */
3813 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3815 preserve_initializer ();
3816 /* Hack? Set the permanent bit for something that is permanent,
3817 but not on the permanent obstack, so as to convince
3818 output_constant_def to make its rtl on the permanent
3820 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3822 /* The initializer and DECL must have the same (or equivalent
3823 types), but if the initializer is a STRING_CST, its type
3824 might not be on the right obstack, so copy the type
3826 TREE_TYPE (DECL_INITIAL (decl)) = type;
3829 DECL_INITIAL (decl) = error_mark_node;
3833 /* If requested, warn about definitions of large data objects. */
3835 if (warn_larger_than
3836 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3837 && !DECL_EXTERNAL (decl))
3839 register tree decl_size = DECL_SIZE (decl);
3841 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3843 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3845 if (units > larger_than_size)
3846 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3851 /* Resume permanent allocation, if not within a function. */
3852 /* The corresponding push_obstacks_nochange is in start_decl,
3853 and in push_parm_decl and in grokfield. */
3857 /* If we have gone back from temporary to permanent allocation,
3858 actually free the temporary space that we no longer need. */
3859 if (temporary && !allocation_temporary_p ())
3860 permanent_allocation (0);
3862 /* At the end of a declaration, throw away any variable type sizes
3863 of types defined inside that declaration. There is no use
3864 computing them in the following function definition. */
3865 if (current_binding_level == global_binding_level)
3866 get_pending_sizes ();
3869 /* If DECL has a cleanup, build and return that cleanup here.
3870 This is a callback called by expand_expr. */
3873 maybe_build_cleanup (decl)
3876 /* There are no cleanups in C. */
3880 /* Given a parsed parameter declaration,
3881 decode it into a PARM_DECL and push that on the current binding level.
3882 Also, for the sake of forward parm decls,
3883 record the given order of parms in `parm_order'. */
3886 push_parm_decl (parm)
3890 int old_immediate_size_expand = immediate_size_expand;
3891 /* Don't try computing parm sizes now -- wait till fn is called. */
3892 immediate_size_expand = 0;
3894 /* The corresponding pop_obstacks is in finish_decl. */
3895 push_obstacks_nochange ();
3897 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3898 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3899 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3900 TREE_PURPOSE (TREE_VALUE (parm)));
3903 if (DECL_NAME (decl))
3906 olddecl = lookup_name (DECL_NAME (decl));
3907 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3908 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3912 decl = pushdecl (decl);
3914 immediate_size_expand = old_immediate_size_expand;
3916 current_binding_level->parm_order
3917 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3919 /* Add this decl to the current binding level. */
3920 finish_decl (decl, NULL_TREE, NULL_TREE);
3923 /* Clear the given order of parms in `parm_order'.
3924 Used at start of parm list,
3925 and also at semicolon terminating forward decls. */
3930 current_binding_level->parm_order = NULL_TREE;
3933 /* Make TYPE a complete type based on INITIAL_VALUE.
3934 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3935 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3938 complete_array_type (type, initial_value, do_default)
3943 register tree maxindex = NULL_TREE;
3948 /* Note MAXINDEX is really the maximum index,
3949 one less than the size. */
3950 if (TREE_CODE (initial_value) == STRING_CST)
3953 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3954 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3957 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3959 tree elts = CONSTRUCTOR_ELTS (initial_value);
3960 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3961 for (; elts; elts = TREE_CHAIN (elts))
3963 if (TREE_PURPOSE (elts))
3964 maxindex = TREE_PURPOSE (elts);
3966 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3968 maxindex = copy_node (maxindex);
3972 /* Make an error message unless that happened already. */
3973 if (initial_value != error_mark_node)
3976 /* Prevent further error messages. */
3977 maxindex = build_int_2 (0, 0);
3984 maxindex = build_int_2 (0, 0);
3990 TYPE_DOMAIN (type) = build_index_type (maxindex);
3991 if (!TREE_TYPE (maxindex))
3992 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3993 #if 0 /* I took out this change
3994 together with the change in build_array_type. --rms */
3995 change_main_variant (type,
3996 build_array_type (TREE_TYPE (type),
3997 TYPE_DOMAIN (type)));
4001 /* Lay out the type now that we can get the real answer. */
4008 /* Given declspecs and a declarator,
4009 determine the name and type of the object declared
4010 and construct a ..._DECL node for it.
4011 (In one case we can return a ..._TYPE node instead.
4012 For invalid input we sometimes return 0.)
4014 DECLSPECS is a chain of tree_list nodes whose value fields
4015 are the storage classes and type specifiers.
4017 DECL_CONTEXT says which syntactic context this declaration is in:
4018 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4019 FUNCDEF for a function definition. Like NORMAL but a few different
4020 error messages in each case. Return value may be zero meaning
4021 this definition is too screwy to try to parse.
4022 PARM for a parameter declaration (either within a function prototype
4023 or before a function body). Make a PARM_DECL, or return void_type_node.
4024 TYPENAME if for a typename (in a cast or sizeof).
4025 Don't make a DECL node; just return the ..._TYPE node.
4026 FIELD for a struct or union field; make a FIELD_DECL.
4027 BITFIELD for a field with specified width.
4028 INITIALIZED is 1 if the decl has an initializer.
4030 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4031 It may also be so in the PARM case, for a prototype where the
4032 argument type is specified but not the name.
4034 This function is where the complicated C meanings of `static'
4035 and `extern' are interpreted. */
4038 grokdeclarator (declarator, declspecs, decl_context, initialized)
4041 enum decl_context decl_context;
4046 tree type = NULL_TREE;
4051 int explicit_int = 0;
4052 int explicit_char = 0;
4053 int defaulted_int = 0;
4054 tree typedef_decl = 0;
4056 tree typedef_type = 0;
4057 int funcdef_flag = 0;
4058 enum tree_code innermost_code = ERROR_MARK;
4060 int size_varies = 0;
4061 tree decl_machine_attr = NULL_TREE;
4063 if (decl_context == BITFIELD)
4064 bitfield = 1, decl_context = FIELD;
4066 if (decl_context == FUNCDEF)
4067 funcdef_flag = 1, decl_context = NORMAL;
4069 push_obstacks_nochange ();
4071 if (flag_traditional && allocation_temporary_p ())
4072 end_temporary_allocation ();
4074 /* Look inside a declarator for the name being declared
4075 and get it as a string, for an error message. */
4077 register tree decl = declarator;
4081 switch (TREE_CODE (decl))
4086 innermost_code = TREE_CODE (decl);
4087 decl = TREE_OPERAND (decl, 0);
4090 case IDENTIFIER_NODE:
4091 name = IDENTIFIER_POINTER (decl);
4102 /* A function definition's declarator must have the form of
4103 a function declarator. */
4105 if (funcdef_flag && innermost_code != CALL_EXPR)
4108 /* Anything declared one level down from the top level
4109 must be one of the parameters of a function
4110 (because the body is at least two levels down). */
4112 /* If this looks like a function definition, make it one,
4113 even if it occurs where parms are expected.
4114 Then store_parm_decls will reject it and not use it as a parm. */
4115 if (decl_context == NORMAL && !funcdef_flag
4116 && current_binding_level->parm_flag)
4117 decl_context = PARM;
4119 /* Look through the decl specs and record which ones appear.
4120 Some typespecs are defined as built-in typenames.
4121 Others, the ones that are modifiers of other types,
4122 are represented by bits in SPECBITS: set the bits for
4123 the modifiers that appear. Storage class keywords are also in SPECBITS.
4125 If there is a typedef name or a type, store the type in TYPE.
4126 This includes builtin typedefs such as `int'.
4128 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4129 and did not come from a user typedef.
4131 Set LONGLONG if `long' is mentioned twice. */
4133 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4136 register tree id = TREE_VALUE (spec);
4138 if (id == ridpointers[(int) RID_INT])
4140 if (id == ridpointers[(int) RID_CHAR])
4143 if (TREE_CODE (id) == IDENTIFIER_NODE)
4144 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4146 if (ridpointers[i] == id)
4148 if (i == (int) RID_LONG && specbits & (1<<i))
4151 error ("`long long long' is too long for GCC");
4154 if (pedantic && ! in_system_header)
4155 pedwarn ("ANSI C does not support `long long'");
4159 else if (specbits & (1 << i))
4160 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4166 error ("two or more data types in declaration of `%s'", name);
4167 /* Actual typedefs come to us as TYPE_DECL nodes. */
4168 else if (TREE_CODE (id) == TYPE_DECL)
4170 type = TREE_TYPE (id);
4171 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4174 /* Built-in types come as identifiers. */
4175 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4177 register tree t = lookup_name (id);
4178 if (TREE_TYPE (t) == error_mark_node)
4180 else if (!t || TREE_CODE (t) != TYPE_DECL)
4181 error ("`%s' fails to be a typedef or built in type",
4182 IDENTIFIER_POINTER (id));
4185 type = TREE_TYPE (t);
4189 else if (TREE_CODE (id) != ERROR_MARK)
4195 typedef_type = type;
4197 size_varies = C_TYPE_VARIABLE_SIZE (type);
4199 /* No type at all: default to `int', and set DEFAULTED_INT
4200 because it was not a user-defined typedef. */
4204 if (funcdef_flag && warn_return_type
4205 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4206 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
4207 warn_about_return_type = 1;
4209 type = integer_type_node;
4212 /* Now process the modifiers that were specified
4213 and check for invalid combinations. */
4215 /* Long double is a special combination. */
4217 if ((specbits & 1 << (int) RID_LONG)
4218 && TYPE_MAIN_VARIANT (type) == double_type_node)
4220 specbits &= ~ (1 << (int) RID_LONG);
4221 type = long_double_type_node;
4224 /* Check all other uses of type modifiers. */
4226 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4227 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4231 if (TREE_CODE (type) != INTEGER_TYPE)
4232 error ("long, short, signed or unsigned invalid for `%s'", name);
4233 else if ((specbits & 1 << (int) RID_LONG)
4234 && (specbits & 1 << (int) RID_SHORT))
4235 error ("long and short specified together for `%s'", name);
4236 else if (((specbits & 1 << (int) RID_LONG)
4237 || (specbits & 1 << (int) RID_SHORT))
4239 error ("long or short specified with char for `%s'", name);
4240 else if (((specbits & 1 << (int) RID_LONG)
4241 || (specbits & 1 << (int) RID_SHORT))
4242 && TREE_CODE (type) == REAL_TYPE)
4243 error ("long or short specified with floating type for `%s'", name);
4244 else if ((specbits & 1 << (int) RID_SIGNED)
4245 && (specbits & 1 << (int) RID_UNSIGNED))
4246 error ("signed and unsigned given together for `%s'", name);
4250 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4252 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4254 if (flag_pedantic_errors)
4259 /* Discard the type modifiers if they are invalid. */
4262 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4263 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4268 if ((specbits & (1 << (int) RID_COMPLEX))
4269 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4271 error ("complex invalid for `%s'", name);
4272 specbits &= ~ (1 << (int) RID_COMPLEX);
4275 /* Decide whether an integer type is signed or not.
4276 Optionally treat bitfields as signed by default. */
4277 if (specbits & 1 << (int) RID_UNSIGNED
4278 /* Traditionally, all bitfields are unsigned. */
4279 || (bitfield && flag_traditional
4280 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4281 || (bitfield && ! flag_signed_bitfields
4282 && (explicit_int || defaulted_int || explicit_char
4283 /* A typedef for plain `int' without `signed'
4284 can be controlled just like plain `int'. */
4285 || ! (typedef_decl != 0
4286 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4287 && TREE_CODE (type) != ENUMERAL_TYPE
4288 && !(specbits & 1 << (int) RID_SIGNED)))
4291 type = long_long_unsigned_type_node;
4292 else if (specbits & 1 << (int) RID_LONG)
4293 type = long_unsigned_type_node;
4294 else if (specbits & 1 << (int) RID_SHORT)
4295 type = short_unsigned_type_node;
4296 else if (type == char_type_node)
4297 type = unsigned_char_type_node;
4298 else if (typedef_decl)
4299 type = unsigned_type (type);
4301 type = unsigned_type_node;
4303 else if ((specbits & 1 << (int) RID_SIGNED)
4304 && type == char_type_node)
4305 type = signed_char_type_node;
4307 type = long_long_integer_type_node;
4308 else if (specbits & 1 << (int) RID_LONG)
4309 type = long_integer_type_node;
4310 else if (specbits & 1 << (int) RID_SHORT)
4311 type = short_integer_type_node;
4313 if (specbits & 1 << (int) RID_COMPLEX)
4315 /* If we just have "complex", it is equivalent to
4316 "complex double", but if any modifiers at all are specified it is
4317 the complex form of TYPE. E.g, "complex short" is
4318 "complex short int". */
4320 if (defaulted_int && ! longlong
4321 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4322 | (1 << (int) RID_SIGNED)
4323 | (1 << (int) RID_UNSIGNED))))
4324 type = complex_double_type_node;
4325 else if (type == integer_type_node)
4326 type = complex_integer_type_node;
4327 else if (type == float_type_node)
4328 type = complex_float_type_node;
4329 else if (type == double_type_node)
4330 type = complex_double_type_node;
4331 else if (type == long_double_type_node)
4332 type = complex_long_double_type_node;
4334 type = build_complex_type (type);
4337 /* Set CONSTP if this declaration is `const', whether by
4338 explicit specification or via a typedef.
4339 Likewise for VOLATILEP. */
4341 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4342 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4343 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4345 pedwarn ("duplicate `const'");
4347 pedwarn ("duplicate `volatile'");
4348 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4349 type = TYPE_MAIN_VARIANT (type);
4351 /* Warn if two storage classes are given. Default to `auto'. */
4356 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4357 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4358 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4359 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4360 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4361 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4363 /* Warn about storage classes that are invalid for certain
4364 kinds of declarations (parameters, typenames, etc.). */
4367 error ("multiple storage classes in declaration of `%s'", name);
4368 else if (funcdef_flag
4370 & ((1 << (int) RID_REGISTER)
4371 | (1 << (int) RID_AUTO)
4372 | (1 << (int) RID_TYPEDEF))))
4374 if (specbits & 1 << (int) RID_AUTO
4375 && (pedantic || current_binding_level == global_binding_level))
4376 pedwarn ("function definition declared `auto'");
4377 if (specbits & 1 << (int) RID_REGISTER)
4378 error ("function definition declared `register'");
4379 if (specbits & 1 << (int) RID_TYPEDEF)
4380 error ("function definition declared `typedef'");
4381 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4382 | (1 << (int) RID_AUTO));
4384 else if (decl_context != NORMAL && nclasses > 0)
4386 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4390 error ((decl_context == FIELD
4391 ? "storage class specified for structure field `%s'"
4392 : (decl_context == PARM
4393 ? "storage class specified for parameter `%s'"
4394 : "storage class specified for typename")),
4396 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4397 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4398 | (1 << (int) RID_EXTERN));
4401 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4403 /* `extern' with initialization is invalid if not at top level. */
4404 if (current_binding_level == global_binding_level)
4405 warning ("`%s' initialized and declared `extern'", name);
4407 error ("`%s' has both `extern' and initializer", name);
4409 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4410 && current_binding_level != global_binding_level)
4411 error ("nested function `%s' declared `extern'", name);
4412 else if (current_binding_level == global_binding_level
4413 && specbits & (1 << (int) RID_AUTO))
4414 error ("top-level declaration of `%s' specifies `auto'", name);
4415 else if ((specbits & 1 << (int) RID_ITERATOR)
4416 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4418 error ("iterator `%s' has derived type", name);
4419 type = error_mark_node;
4421 else if ((specbits & 1 << (int) RID_ITERATOR)
4422 && TREE_CODE (type) != INTEGER_TYPE)
4424 error ("iterator `%s' has noninteger type", name);
4425 type = error_mark_node;
4429 /* Now figure out the structure of the declarator proper.
4430 Descend through it, creating more complex types, until we reach
4431 the declared identifier (or NULL_TREE, in an absolute declarator). */
4433 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4435 if (type == error_mark_node)
4437 declarator = TREE_OPERAND (declarator, 0);
4441 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4442 an INDIRECT_REF (for *...),
4443 a CALL_EXPR (for ...(...)),
4444 an identifier (for the name being declared)
4445 or a null pointer (for the place in an absolute declarator
4446 where the name was omitted).
4447 For the last two cases, we have just exited the loop.
4449 At this point, TYPE is the type of elements of an array,
4450 or for a function to return, or for a pointer to point to.
4451 After this sequence of ifs, TYPE is the type of the
4452 array or function or pointer, and DECLARATOR has had its
4453 outermost layer removed. */
4455 if (TREE_CODE (declarator) == ARRAY_REF)
4457 register tree itype = NULL_TREE;
4458 register tree size = TREE_OPERAND (declarator, 1);
4459 /* An uninitialized decl with `extern' is a reference. */
4460 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4461 /* The index is a signed object `sizetype' bits wide. */
4462 tree index_type = signed_type (sizetype);
4464 declarator = TREE_OPERAND (declarator, 0);
4466 /* Check for some types that there cannot be arrays of. */
4468 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4470 error ("declaration of `%s' as array of voids", name);
4471 type = error_mark_node;
4474 if (TREE_CODE (type) == FUNCTION_TYPE)
4476 error ("declaration of `%s' as array of functions", name);
4477 type = error_mark_node;
4480 if (size == error_mark_node)
4481 type = error_mark_node;
4483 if (type == error_mark_node)
4486 /* If this is a block level extern, it must live past the end
4487 of the function so that we can check it against other extern
4488 declarations (IDENTIFIER_LIMBO_VALUE). */
4489 if (extern_ref && allocation_temporary_p ())
4490 end_temporary_allocation ();
4492 /* If size was specified, set ITYPE to a range-type for that size.
4493 Otherwise, ITYPE remains null. finish_decl may figure it out
4494 from an initial value. */
4498 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4499 STRIP_TYPE_NOPS (size);
4501 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4502 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4504 error ("size of array `%s' has non-integer type", name);
4505 size = integer_one_node;
4508 if (pedantic && integer_zerop (size))
4509 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4511 if (TREE_CODE (size) == INTEGER_CST)
4513 constant_expression_warning (size);
4514 if (tree_int_cst_sgn (size) < 0)
4516 error ("size of array `%s' is negative", name);
4517 size = integer_one_node;
4522 /* Make sure the array size remains visibly nonconstant
4523 even if it is (eg) a const variable with known value. */
4528 if (TREE_CONSTANT (size))
4529 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4531 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4535 /* Convert size to index_type, so that if it is a variable
4536 the computations will be done in the proper mode. */
4537 itype = fold (build (MINUS_EXPR, index_type,
4538 convert (index_type, size),
4539 convert (index_type, size_one_node)));
4542 itype = variable_size (itype);
4543 itype = build_index_type (itype);
4546 #if 0 /* This had bad results for pointers to arrays, as in
4547 union incomplete (*foo)[4]; */
4548 /* Complain about arrays of incomplete types, except in typedefs. */
4550 if (TYPE_SIZE (type) == 0
4551 /* Avoid multiple warnings for nested array types. */
4552 && TREE_CODE (type) != ARRAY_TYPE
4553 && !(specbits & (1 << (int) RID_TYPEDEF))
4554 && !C_TYPE_BEING_DEFINED (type))
4555 warning ("array type has incomplete element type");
4558 #if 0 /* We shouldn't have a function type here at all!
4559 Functions aren't allowed as array elements. */
4560 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4561 && (constp || volatilep))
4562 pedwarn ("ANSI C forbids const or volatile function types");
4565 /* Build the array type itself, then merge any constancy or
4566 volatility into the target type. We must do it in this order
4567 to ensure that the TYPE_MAIN_VARIANT field of the array type
4568 is set correctly. */
4570 type = build_array_type (type, itype);
4571 if (constp || volatilep)
4572 type = c_build_type_variant (type, constp, volatilep);
4574 #if 0 /* don't clear these; leave them set so that the array type
4575 or the variable is itself const or volatile. */
4581 C_TYPE_VARIABLE_SIZE (type) = 1;
4583 else if (TREE_CODE (declarator) == CALL_EXPR)
4585 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4586 || current_binding_level == global_binding_level);
4589 /* Declaring a function type.
4590 Make sure we have a valid type for the function to return. */
4591 if (type == error_mark_node)
4596 /* Warn about some types functions can't return. */
4598 if (TREE_CODE (type) == FUNCTION_TYPE)
4600 error ("`%s' declared as function returning a function", name);
4601 type = integer_type_node;
4603 if (TREE_CODE (type) == ARRAY_TYPE)
4605 error ("`%s' declared as function returning an array", name);
4606 type = integer_type_node;
4609 #ifndef TRADITIONAL_RETURN_FLOAT
4610 /* Traditionally, declaring return type float means double. */
4612 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4613 type = double_type_node;
4614 #endif /* TRADITIONAL_RETURN_FLOAT */
4616 /* If this is a block level extern, it must live past the end
4617 of the function so that we can check it against other extern
4618 declarations (IDENTIFIER_LIMBO_VALUE). */
4619 if (extern_ref && allocation_temporary_p ())
4620 end_temporary_allocation ();
4622 /* Construct the function type and go to the next
4623 inner layer of declarator. */
4625 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4627 /* Say it's a definition
4628 only for the CALL_EXPR
4629 closest to the identifier. */
4630 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4631 #if 0 /* This seems to be false. We turn off temporary allocation
4632 above in this function if -traditional.
4633 And this code caused inconsistent results with prototypes:
4634 callers would ignore them, and pass arguments wrong. */
4636 /* Omit the arg types if -traditional, since the arg types
4637 and the list links might not be permanent. */
4638 type = build_function_type (type,
4640 ? NULL_TREE : arg_types);
4642 /* ANSI seems to say that `const int foo ();'
4643 does not make the function foo const. */
4644 if (constp || volatilep)
4645 type = c_build_type_variant (type, constp, volatilep);
4649 type = build_function_type (type, arg_types);
4650 declarator = TREE_OPERAND (declarator, 0);
4652 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4653 the formal parameter list of this FUNCTION_TYPE to point to
4654 the FUNCTION_TYPE node itself. */
4659 for (link = current_function_parm_tags;
4661 link = TREE_CHAIN (link))
4662 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4665 else if (TREE_CODE (declarator) == INDIRECT_REF)
4667 /* Merge any constancy or volatility into the target type
4670 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4671 && (constp || volatilep))
4672 pedwarn ("ANSI C forbids const or volatile function types");
4673 if (constp || volatilep)
4674 type = c_build_type_variant (type, constp, volatilep);
4679 type = build_pointer_type (type);
4681 /* Process a list of type modifier keywords
4682 (such as const or volatile) that were given inside the `*'. */
4684 if (TREE_TYPE (declarator))
4686 register tree typemodlist;
4688 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4689 typemodlist = TREE_CHAIN (typemodlist))
4691 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4693 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4698 error ("invalid type modifier within pointer declarator");
4702 pedwarn ("duplicate `const'");
4704 pedwarn ("duplicate `volatile'");
4707 declarator = TREE_OPERAND (declarator, 0);
4714 /* Now TYPE has the actual type. */
4716 /* If this is declaring a typedef name, return a TYPE_DECL. */
4718 if (specbits & (1 << (int) RID_TYPEDEF))
4721 /* Note that the grammar rejects storage classes
4722 in typenames, fields or parameters */
4723 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4724 && (constp || volatilep))
4725 pedwarn ("ANSI C forbids const or volatile function types");
4726 if (constp || volatilep)
4727 type = c_build_type_variant (type, constp, volatilep);
4729 decl = build_decl (TYPE_DECL, declarator, type);
4730 if ((specbits & (1 << (int) RID_SIGNED))
4731 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4732 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4736 /* Detect the case of an array type of unspecified size
4737 which came, as such, direct from a typedef name.
4738 We must copy the type, so that each identifier gets
4739 a distinct type, so that each identifier's size can be
4740 controlled separately by its own initializer. */
4742 if (type != 0 && typedef_type != 0
4743 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4744 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4746 type = build_array_type (TREE_TYPE (type), 0);
4748 C_TYPE_VARIABLE_SIZE (type) = 1;
4751 /* If this is a type name (such as, in a cast or sizeof),
4752 compute the type and return it now. */
4754 if (decl_context == TYPENAME)
4756 /* Note that the grammar rejects storage classes
4757 in typenames, fields or parameters */
4758 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4759 && (constp || volatilep))
4760 pedwarn ("ANSI C forbids const or volatile function types");
4761 if (constp || volatilep)
4762 type = c_build_type_variant (type, constp, volatilep);
4767 /* Aside from typedefs and type names (handle above),
4768 `void' at top level (not within pointer)
4769 is allowed only in public variables.
4770 We don't complain about parms either, but that is because
4771 a better error message can be made later. */
4773 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4774 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4775 && ((specbits & (1 << (int) RID_EXTERN))
4776 || (current_binding_level == global_binding_level
4778 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4780 error ("variable or field `%s' declared void", name);
4781 type = integer_type_node;
4784 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4785 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4790 if (decl_context == PARM)
4792 tree type_as_written = type;
4795 /* A parameter declared as an array of T is really a pointer to T.
4796 One declared as a function is really a pointer to a function. */
4798 if (TREE_CODE (type) == ARRAY_TYPE)
4800 /* Transfer const-ness of array into that of type pointed to. */
4801 type = TREE_TYPE (type);
4802 if (constp || volatilep)
4803 type = c_build_type_variant (type, constp, volatilep);
4804 type = build_pointer_type (type);
4805 volatilep = constp = 0;
4808 else if (TREE_CODE (type) == FUNCTION_TYPE)
4810 if (pedantic && (constp || volatilep))
4811 pedwarn ("ANSI C forbids const or volatile function types");
4812 if (constp || volatilep)
4813 type = c_build_type_variant (type, constp, volatilep);
4814 type = build_pointer_type (type);
4815 volatilep = constp = 0;
4818 decl = build_decl (PARM_DECL, declarator, type);
4820 C_DECL_VARIABLE_SIZE (decl) = 1;
4822 /* Compute the type actually passed in the parmlist,
4823 for the case where there is no prototype.
4824 (For example, shorts and chars are passed as ints.)
4825 When there is a prototype, this is overridden later. */
4827 DECL_ARG_TYPE (decl) = type;
4828 main_type = (type == error_mark_node
4830 : TYPE_MAIN_VARIANT (type));
4831 if (main_type == float_type_node)
4832 DECL_ARG_TYPE (decl) = double_type_node;
4833 /* Don't use TYPE_PRECISION to decide whether to promote,
4834 because we should convert short if it's the same size as int,
4835 but we should not convert long if it's the same size as int. */
4836 else if (TREE_CODE (main_type) != ERROR_MARK
4837 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4839 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4840 && TREE_UNSIGNED (type))
4841 DECL_ARG_TYPE (decl) = unsigned_type_node;
4843 DECL_ARG_TYPE (decl) = integer_type_node;
4846 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4848 else if (decl_context == FIELD)
4850 /* Structure field. It may not be a function. */
4852 if (TREE_CODE (type) == FUNCTION_TYPE)
4854 error ("field `%s' declared as a function", name);
4855 type = build_pointer_type (type);
4857 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4859 error ("field `%s' has incomplete type", name);
4860 type = error_mark_node;
4862 /* Move type qualifiers down to element of an array. */
4863 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4865 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4867 TYPE_DOMAIN (type));
4868 #if 0 /* Leave the field const or volatile as well. */
4869 constp = volatilep = 0;
4872 decl = build_decl (FIELD_DECL, declarator, type);
4874 C_DECL_VARIABLE_SIZE (decl) = 1;
4876 else if (TREE_CODE (type) == FUNCTION_TYPE)
4878 /* Every function declaration is "external"
4879 except for those which are inside a function body
4880 in which `auto' is used.
4881 That is a case not specified by ANSI C,
4882 and we use it for forward declarations for nested functions. */
4883 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4884 || current_binding_level == global_binding_level);
4886 if (specbits & (1 << (int) RID_AUTO)
4887 && (pedantic || current_binding_level == global_binding_level))
4888 pedwarn ("invalid storage class for function `%s'", name);
4889 if (specbits & (1 << (int) RID_REGISTER))
4890 error ("invalid storage class for function `%s'", name);
4891 /* Function declaration not at top level.
4892 Storage classes other than `extern' are not allowed
4893 and `extern' makes no difference. */
4894 if (current_binding_level != global_binding_level
4895 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4897 pedwarn ("invalid storage class for function `%s'", name);
4899 /* If this is a block level extern, it must live past the end
4900 of the function so that we can check it against other
4901 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4902 if (extern_ref && allocation_temporary_p ())
4903 end_temporary_allocation ();
4905 decl = build_decl (FUNCTION_DECL, declarator, type);
4906 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4908 if (pedantic && (constp || volatilep)
4909 && ! DECL_IN_SYSTEM_HEADER (decl))
4910 pedwarn ("ANSI C forbids const or volatile functions");
4913 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4914 warning ("`noreturn' function returns non-void value");
4917 DECL_EXTERNAL (decl) = 1;
4918 /* Record absence of global scope for `static' or `auto'. */
4920 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4922 /* Record presence of `inline', if it is reasonable. */
4925 tree last = tree_last (TYPE_ARG_TYPES (type));
4927 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4928 warning ("cannot inline function `main'");
4929 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4931 warning ("inline declaration ignored for function with `...'");
4933 /* Assume that otherwise the function can be inlined. */
4934 DECL_INLINE (decl) = 1;
4936 if (specbits & (1 << (int) RID_EXTERN))
4937 current_extern_inline = 1;
4942 /* It's a variable. */
4943 /* An uninitialized decl with `extern' is a reference. */
4944 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4946 /* Move type qualifiers down to element of an array. */
4947 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4949 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4951 TYPE_DOMAIN (type));
4952 #if 0 /* Leave the variable const or volatile as well. */
4953 constp = volatilep = 0;
4957 /* If this is a block level extern, it must live past the end
4958 of the function so that we can check it against other
4959 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4960 if (extern_ref && allocation_temporary_p ())
4961 end_temporary_allocation ();
4963 decl = build_decl (VAR_DECL, declarator, type);
4965 C_DECL_VARIABLE_SIZE (decl) = 1;
4968 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4970 DECL_EXTERNAL (decl) = extern_ref;
4971 /* At top level, the presence of a `static' or `register' storage
4972 class specifier, or the absence of all storage class specifiers
4973 makes this declaration a definition (perhaps tentative). Also,
4974 the absence of both `static' and `register' makes it public. */
4975 if (current_binding_level == global_binding_level)
4979 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4980 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4982 /* Not at top level, only `static' makes a static definition. */
4985 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4986 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4989 if (specbits & 1 << (int) RID_ITERATOR)
4990 ITERATOR_P (decl) = 1;
4993 /* Record `register' declaration for warnings on &
4994 and in case doing stupid register allocation. */
4996 if (specbits & (1 << (int) RID_REGISTER))
4997 DECL_REGISTER (decl) = 1;
4999 /* Record constancy and volatility. */
5002 TREE_READONLY (decl) = 1;
5005 TREE_SIDE_EFFECTS (decl) = 1;
5006 TREE_THIS_VOLATILE (decl) = 1;
5008 /* If a type has volatile components, it should be stored in memory.
5009 Otherwise, the fact that those components are volatile
5010 will be ignored, and would even crash the compiler. */
5011 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5012 mark_addressable (decl);
5020 /* Decode the parameter-list info for a function type or function definition.
5021 The argument is the value returned by `get_parm_info' (or made in parse.y
5022 if there is an identifier list instead of a parameter decl list).
5023 These two functions are separate because when a function returns
5024 or receives functions then each is called multiple times but the order
5025 of calls is different. The last call to `grokparms' is always the one
5026 that contains the formal parameter names of a function definition.
5028 Store in `last_function_parms' a chain of the decls of parms.
5029 Also store in `last_function_parm_tags' a chain of the struct, union,
5030 and enum tags declared among the parms.
5032 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5034 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5035 a mere declaration. A nonempty identifier-list gets an error message
5036 when FUNCDEF_FLAG is zero. */
5039 grokparms (parms_info, funcdef_flag)
5043 tree first_parm = TREE_CHAIN (parms_info);
5045 last_function_parms = TREE_PURPOSE (parms_info);
5046 last_function_parm_tags = TREE_VALUE (parms_info);
5048 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5049 && !in_system_header)
5050 warning ("function declaration isn't a prototype");
5053 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5056 pedwarn ("parameter names (without types) in function declaration");
5058 last_function_parms = first_parm;
5065 /* We no longer test FUNCDEF_FLAG.
5066 If the arg types are incomplete in a declaration,
5067 they must include undefined tags.
5068 These tags can never be defined in the scope of the declaration,
5069 so the types can never be completed,
5070 and no call can be compiled successfully. */
5072 /* In a fcn definition, arg types must be complete. */
5075 for (parm = last_function_parms, typelt = first_parm;
5077 parm = TREE_CHAIN (parm))
5078 /* Skip over any enumeration constants declared here. */
5079 if (TREE_CODE (parm) == PARM_DECL)
5081 /* Barf if the parameter itself has an incomplete type. */
5082 tree type = TREE_VALUE (typelt);
5083 if (TYPE_SIZE (type) == 0)
5085 if (funcdef_flag && DECL_NAME (parm) != 0)
5086 error ("parameter `%s' has incomplete type",
5087 IDENTIFIER_POINTER (DECL_NAME (parm)));
5089 warning ("parameter has incomplete type");
5092 TREE_VALUE (typelt) = error_mark_node;
5093 TREE_TYPE (parm) = error_mark_node;
5096 #if 0 /* This has been replaced by parm_tags_warning
5097 which uses a more accurate criterion for what to warn about. */
5100 /* Now warn if is a pointer to an incomplete type. */
5101 while (TREE_CODE (type) == POINTER_TYPE
5102 || TREE_CODE (type) == REFERENCE_TYPE)
5103 type = TREE_TYPE (type);
5104 type = TYPE_MAIN_VARIANT (type);
5105 if (TYPE_SIZE (type) == 0)
5107 if (DECL_NAME (parm) != 0)
5108 warning ("parameter `%s' points to incomplete type",
5109 IDENTIFIER_POINTER (DECL_NAME (parm)));
5111 warning ("parameter points to incomplete type");
5115 typelt = TREE_CHAIN (typelt);
5118 /* Allocate the list of types the way we allocate a type. */
5119 if (first_parm && ! TREE_PERMANENT (first_parm))
5121 /* Construct a copy of the list of types
5122 on the saveable obstack. */
5124 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5125 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5127 return nreverse (result);
5130 /* The list we have is permanent already. */
5136 /* Return a tree_list node with info on a parameter list just parsed.
5137 The TREE_PURPOSE is a chain of decls of those parms.
5138 The TREE_VALUE is a list of structure, union and enum tags defined.
5139 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5140 This tree_list node is later fed to `grokparms'.
5142 VOID_AT_END nonzero means append `void' to the end of the type-list.
5143 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5146 get_parm_info (void_at_end)
5149 register tree decl, t;
5150 register tree types = 0;
5152 tree tags = gettags ();
5153 tree parms = getdecls ();
5155 tree order = current_binding_level->parm_order;
5157 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5158 if (void_at_end && parms != 0
5159 && TREE_CHAIN (parms) == 0
5160 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5161 && DECL_NAME (parms) == 0)
5164 storedecls (NULL_TREE);
5165 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5166 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5169 /* Extract enumerator values and other non-parms declared with the parms.
5170 Likewise any forward parm decls that didn't have real parm decls. */
5171 for (decl = parms; decl; )
5173 tree next = TREE_CHAIN (decl);
5175 if (TREE_CODE (decl) != PARM_DECL)
5177 TREE_CHAIN (decl) = new_parms;
5180 else if (TREE_ASM_WRITTEN (decl))
5182 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5183 TREE_CHAIN (decl) = new_parms;
5189 /* Put the parm decls back in the order they were in in the parm list. */
5190 for (t = order; t; t = TREE_CHAIN (t))
5193 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5195 TREE_CHAIN (TREE_VALUE (t)) = 0;
5198 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5201 /* Store the parmlist in the binding level since the old one
5202 is no longer a valid list. (We have changed the chain pointers.) */
5203 storedecls (new_parms);
5205 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5206 /* There may also be declarations for enumerators if an enumeration
5207 type is declared among the parms. Ignore them here. */
5208 if (TREE_CODE (decl) == PARM_DECL)
5210 /* Since there is a prototype,
5211 args are passed in their declared types. */
5212 tree type = TREE_TYPE (decl);
5213 DECL_ARG_TYPE (decl) = type;
5214 #ifdef PROMOTE_PROTOTYPES
5215 if ((TREE_CODE (type) == INTEGER_TYPE
5216 || TREE_CODE (type) == ENUMERAL_TYPE)
5217 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5218 DECL_ARG_TYPE (decl) = integer_type_node;
5221 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5222 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5223 && DECL_NAME (decl) == 0)
5225 error ("`void' in parameter list must be the entire list");
5231 return saveable_tree_cons (new_parms, tags,
5232 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5234 return saveable_tree_cons (new_parms, tags, nreverse (types));
5237 /* At end of parameter list, warn about any struct, union or enum tags
5238 defined within. Do so because these types cannot ever become complete. */
5241 parmlist_tags_warning ()
5246 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5248 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5249 /* An anonymous union parm type is meaningful as a GNU extension.
5250 So don't warn for that. */
5251 if (code == UNION_TYPE && !pedantic)
5253 if (TREE_PURPOSE (elt) != 0)
5254 warning ("`%s %s' declared inside parameter list",
5255 (code == RECORD_TYPE ? "struct"
5256 : code == UNION_TYPE ? "union"
5258 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5260 warning ("anonymous %s declared inside parameter list",
5261 (code == RECORD_TYPE ? "struct"
5262 : code == UNION_TYPE ? "union"
5267 warning ("its scope is only this definition or declaration,");
5268 warning ("which is probably not what you want.");
5274 /* Get the struct, enum or union (CODE says which) with tag NAME.
5275 Define the tag as a forward-reference if it is not defined. */
5278 xref_tag (code, name)
5279 enum tree_code code;
5282 int temporary = allocation_temporary_p ();
5284 /* If a cross reference is requested, look up the type
5285 already defined for this tag and return it. */
5287 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5288 /* Even if this is the wrong type of tag, return what we found.
5289 There will be an error message anyway, from pending_xref_error.
5290 If we create an empty xref just for an invalid use of the type,
5291 the main result is to create lots of superfluous error messages. */
5295 push_obstacks_nochange ();
5297 if (current_binding_level == global_binding_level && temporary)
5298 end_temporary_allocation ();
5300 /* If no such tag is yet defined, create a forward-reference node
5301 and record it as the "definition".
5302 When a real declaration of this type is found,
5303 the forward-reference will be altered into a real type. */
5305 ref = make_node (code);
5306 if (code == ENUMERAL_TYPE)
5308 /* (In ANSI, Enums can be referred to only if already defined.) */
5310 pedwarn ("ANSI C forbids forward references to `enum' types");
5311 /* Give the type a default layout like unsigned int
5312 to avoid crashing if it does not get defined. */
5313 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5314 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5315 TREE_UNSIGNED (ref) = 1;
5316 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5317 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5318 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5321 pushtag (name, ref);
5328 /* Make sure that the tag NAME is defined *in the current binding level*
5329 at least as a forward reference.
5330 CODE says which kind of tag NAME ought to be.
5332 We also do a push_obstacks_nochange
5333 whose matching pop is in finish_struct. */
5336 start_struct (code, name)
5337 enum tree_code code;
5340 /* If there is already a tag defined at this binding level
5341 (as a forward reference), just return it. */
5343 register tree ref = 0;
5345 push_obstacks_nochange ();
5346 if (current_binding_level == global_binding_level)
5347 end_temporary_allocation ();
5350 ref = lookup_tag (code, name, current_binding_level, 1);
5351 if (ref && TREE_CODE (ref) == code)
5353 C_TYPE_BEING_DEFINED (ref) = 1;
5354 if (TYPE_FIELDS (ref))
5355 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5356 : "redefinition of `struct %s'"),
5357 IDENTIFIER_POINTER (name));
5362 /* Otherwise create a forward-reference just so the tag is in scope. */
5364 ref = make_node (code);
5365 pushtag (name, ref);
5366 C_TYPE_BEING_DEFINED (ref) = 1;
5370 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5371 of a structure component, returning a FIELD_DECL node.
5372 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5374 This is done during the parsing of the struct declaration.
5375 The FIELD_DECL nodes are chained together and the lot of them
5376 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5379 grokfield (filename, line, declarator, declspecs, width)
5382 tree declarator, declspecs, width;
5386 /* The corresponding pop_obstacks is in finish_decl. */
5387 push_obstacks_nochange ();
5389 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5391 finish_decl (value, NULL_TREE, NULL_TREE);
5392 DECL_INITIAL (value) = width;
5394 maybe_objc_check_decl (value);
5398 /* Function to help qsort sort FIELD_DECLs by name order. */
5401 field_decl_cmp (x, y)
5404 if (DECL_NAME (*x) == DECL_NAME (*y))
5406 if (DECL_NAME (*x) == NULL)
5408 if (DECL_NAME (*y) == NULL)
5410 if (DECL_NAME (*x) < DECL_NAME (*y))
5415 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5416 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5417 ATTRIBUTES are attributes to be applied to the structure.
5419 We also do a pop_obstacks to match the push in start_struct. */
5422 finish_struct (t, fieldlist, attributes)
5429 int toplevel = global_binding_level == current_binding_level;
5431 /* If this type was previously laid out as a forward reference,
5432 make sure we lay it out again. */
5436 decl_attributes (t, attributes, NULL_TREE);
5438 /* Nameless union parm types are useful as GCC extension. */
5439 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5440 /* Otherwise, warn about any struct or union def. in parmlist. */
5441 if (in_parm_level_p ())
5444 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5445 : "structure defined inside parms"));
5446 else if (! flag_traditional)
5447 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5448 : "structure defined inside parms"));
5451 old_momentary = suspend_momentary ();
5453 if (fieldlist == 0 && pedantic)
5454 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5455 : "structure has no members"));
5457 /* Install struct as DECL_CONTEXT of each field decl.
5458 Also process specified field sizes.
5459 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5460 The specified size is found in the DECL_INITIAL.
5461 Store 0 there, except for ": 0" fields (so we can find them
5462 and delete them, below). */
5464 for (x = fieldlist; x; x = TREE_CHAIN (x))
5466 DECL_CONTEXT (x) = t;
5467 DECL_PACKED (x) |= TYPE_PACKED (t);
5468 DECL_FIELD_SIZE (x) = 0;
5470 /* If any field is const, the structure type is pseudo-const. */
5471 if (TREE_READONLY (x))
5472 C_TYPE_FIELDS_READONLY (t) = 1;
5475 /* A field that is pseudo-const makes the structure likewise. */
5476 tree t1 = TREE_TYPE (x);
5477 while (TREE_CODE (t1) == ARRAY_TYPE)
5478 t1 = TREE_TYPE (t1);
5479 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5480 && C_TYPE_FIELDS_READONLY (t1))
5481 C_TYPE_FIELDS_READONLY (t) = 1;
5484 /* Any field that is volatile means variables of this type must be
5485 treated in some ways as volatile. */
5486 if (TREE_THIS_VOLATILE (x))
5487 C_TYPE_FIELDS_VOLATILE (t) = 1;
5489 /* Any field of nominal variable size implies structure is too. */
5490 if (C_DECL_VARIABLE_SIZE (x))
5491 C_TYPE_VARIABLE_SIZE (t) = 1;
5493 /* Detect invalid nested redefinition. */
5494 if (TREE_TYPE (x) == t)
5495 error ("nested redefinition of `%s'",
5496 IDENTIFIER_POINTER (TYPE_NAME (t)));
5498 /* Detect invalid bit-field size. */
5499 if (DECL_INITIAL (x))
5500 STRIP_NOPS (DECL_INITIAL (x));
5501 if (DECL_INITIAL (x))
5503 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5504 constant_expression_warning (DECL_INITIAL (x));
5507 error_with_decl (x, "bit-field `%s' width not an integer constant");
5508 DECL_INITIAL (x) = NULL;
5512 /* Detect invalid bit-field type. */
5513 if (DECL_INITIAL (x)
5514 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5515 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5517 error_with_decl (x, "bit-field `%s' has invalid type");
5518 DECL_INITIAL (x) = NULL;
5520 if (DECL_INITIAL (x) && pedantic
5521 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5522 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5523 /* Accept an enum that's equivalent to int or unsigned int. */
5524 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5525 && (TYPE_PRECISION (TREE_TYPE (x))
5526 == TYPE_PRECISION (integer_type_node))))
5527 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5529 /* Detect and ignore out of range field width. */
5530 if (DECL_INITIAL (x))
5532 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5534 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5536 DECL_INITIAL (x) = NULL;
5537 error_with_decl (x, "negative width in bit-field `%s'");
5539 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5540 || width > TYPE_PRECISION (TREE_TYPE (x)))
5542 DECL_INITIAL (x) = NULL;
5543 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5545 else if (width == 0 && DECL_NAME (x) != 0)
5547 error_with_decl (x, "zero width for bit-field `%s'");
5548 DECL_INITIAL (x) = NULL;
5552 /* Process valid field width. */
5553 if (DECL_INITIAL (x))
5555 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5557 DECL_FIELD_SIZE (x) = width;
5558 DECL_BIT_FIELD (x) = 1;
5559 DECL_INITIAL (x) = NULL;
5563 /* field size 0 => force desired amount of alignment. */
5564 #ifdef EMPTY_FIELD_BOUNDARY
5565 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5567 #ifdef PCC_BITFIELD_TYPE_MATTERS
5568 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5569 TYPE_ALIGN (TREE_TYPE (x)));
5573 else if (TREE_TYPE (x) != error_mark_node)
5575 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5576 : TYPE_ALIGN (TREE_TYPE (x)));
5577 /* Non-bit-fields are aligned for their type, except packed
5578 fields which require only BITS_PER_UNIT alignment. */
5579 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5583 /* Now DECL_INITIAL is null on all members. */
5585 /* Delete all duplicate fields from the fieldlist */
5586 for (x = fieldlist; x && TREE_CHAIN (x);)
5587 /* Anonymous fields aren't duplicates. */
5588 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5592 register tree y = fieldlist;
5596 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5602 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5604 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5605 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5607 else x = TREE_CHAIN (x);
5610 /* Now we have the nearly final fieldlist. Record it,
5611 then lay out the structure or union (including the fields). */
5613 TYPE_FIELDS (t) = fieldlist;
5617 /* Delete all zero-width bit-fields from the front of the fieldlist */
5619 && DECL_INITIAL (fieldlist))
5620 fieldlist = TREE_CHAIN (fieldlist);
5621 /* Delete all such members from the rest of the fieldlist */
5622 for (x = fieldlist; x;)
5624 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5625 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5626 else x = TREE_CHAIN (x);
5629 /* Now we have the truly final field list.
5630 Store it in this type and in the variants. */
5632 TYPE_FIELDS (t) = fieldlist;
5634 /* If there are lots of fields, sort so we can look through them fast.
5635 We arbitrarily consider 16 or more elts to be "a lot". */
5639 for (x = fieldlist; x; x = TREE_CHAIN (x))
5650 len += list_length (x);
5651 /* Use the same allocation policy here that make_node uses, to
5652 ensure that this lives as long as the rest of the struct decl.
5653 All decls in an inline function need to be saved. */
5654 if (allocation_temporary_p ())
5655 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5657 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5659 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5660 TYPE_LANG_SPECIFIC (t)->len = len;
5662 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5664 for (x = fieldlist; x; x = TREE_CHAIN (x))
5665 field_array[len++] = x;
5667 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5671 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5673 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5674 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5675 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5678 /* Promote each bit-field's type to int if it is narrower than that. */
5679 for (x = fieldlist; x; x = TREE_CHAIN (x))
5680 if (DECL_BIT_FIELD (x)
5681 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
5682 || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
5684 tree type = TREE_TYPE (x);
5686 /* Preserve unsignedness if traditional
5687 or if not really getting any wider. */
5688 if (TREE_UNSIGNED (type)
5689 && (flag_traditional
5691 (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5693 DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
5694 TREE_TYPE (x) = unsigned_type_node;
5696 TREE_TYPE (x) = integer_type_node;
5699 /* If this was supposed to be a transparent union, but we can't
5700 make it one, warn and turn off the flag. */
5701 if (TREE_CODE (t) == UNION_TYPE
5702 && TYPE_TRANSPARENT_UNION (t)
5703 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5705 TYPE_TRANSPARENT_UNION (t) = 0;
5706 warning ("cannot make `%s' a transparent union");
5709 /* If this structure or union completes the type of any previous
5710 variable declaration, lay it out and output its rtl. */
5712 if (current_binding_level->n_incomplete != 0)
5715 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5717 if (TREE_TYPE (decl) == t
5718 && TREE_CODE (decl) != TYPE_DECL)
5720 layout_decl (decl, 0);
5721 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5722 maybe_objc_check_decl (decl);
5723 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5726 --current_binding_level->n_incomplete;
5728 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5729 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5731 tree element = TREE_TYPE (decl);
5732 while (TREE_CODE (element) == ARRAY_TYPE)
5733 element = TREE_TYPE (element);
5735 layout_array_type (TREE_TYPE (decl));
5740 resume_momentary (old_momentary);
5742 /* Finish debugging output for this type. */
5743 rest_of_type_compilation (t, toplevel);
5745 /* The matching push is in start_struct. */
5751 /* Lay out the type T, and its element type, and so on. */
5754 layout_array_type (t)
5757 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5758 layout_array_type (TREE_TYPE (t));
5762 /* Begin compiling the definition of an enumeration type.
5763 NAME is its name (or null if anonymous).
5764 Returns the type object, as yet incomplete.
5765 Also records info about it so that build_enumerator
5766 may be used to declare the individual values as they are read. */
5772 register tree enumtype = 0;
5774 /* If this is the real definition for a previous forward reference,
5775 fill in the contents in the same object that used to be the
5776 forward reference. */
5779 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5781 /* The corresponding pop_obstacks is in finish_enum. */
5782 push_obstacks_nochange ();
5783 /* If these symbols and types are global, make them permanent. */
5784 if (current_binding_level == global_binding_level)
5785 end_temporary_allocation ();
5787 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5789 enumtype = make_node (ENUMERAL_TYPE);
5790 pushtag (name, enumtype);
5793 C_TYPE_BEING_DEFINED (enumtype) = 1;
5795 if (TYPE_VALUES (enumtype) != 0)
5797 /* This enum is a named one that has been declared already. */
5798 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5800 /* Completely replace its old definition.
5801 The old enumerators remain defined, however. */
5802 TYPE_VALUES (enumtype) = 0;
5805 enum_next_value = integer_zero_node;
5811 /* After processing and defining all the values of an enumeration type,
5812 install their decls in the enumeration type and finish it off.
5813 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5814 and ATTRIBUTES are the specified attributes.
5815 Returns ENUMTYPE. */
5818 finish_enum (enumtype, values, attributes)
5823 register tree pair, tem;
5824 tree minnode = 0, maxnode = 0;
5825 int lowprec, highprec, precision;
5826 int toplevel = global_binding_level == current_binding_level;
5828 if (in_parm_level_p ())
5829 warning ("enum defined inside parms");
5831 decl_attributes (enumtype, attributes, NULL_TREE);
5833 /* Calculate the maximum value of any enumerator in this type. */
5835 if (values == error_mark_node)
5836 minnode = maxnode = integer_zero_node;
5838 for (pair = values; pair; pair = TREE_CHAIN (pair))
5840 tree value = TREE_VALUE (pair);
5842 minnode = maxnode = TREE_VALUE (pair);
5845 if (tree_int_cst_lt (maxnode, value))
5847 if (tree_int_cst_lt (value, minnode))
5852 TYPE_MIN_VALUE (enumtype) = minnode;
5853 TYPE_MAX_VALUE (enumtype) = maxnode;
5855 /* An enum can have some negative values; then it is signed. */
5856 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5858 /* Determine the precision this type needs. */
5860 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5861 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5862 precision = MAX (lowprec, highprec);
5864 if (flag_short_enums || TYPE_PACKED (enumtype)
5865 || precision > TYPE_PRECISION (integer_type_node))
5866 /* Use the width of the narrowest normal C type which is wide enough. */
5867 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5869 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5871 TYPE_SIZE (enumtype) = 0;
5872 layout_type (enumtype);
5874 if (values != error_mark_node)
5876 /* Change the type of the enumerators to be the enum type.
5877 Formerly this was done only for enums that fit in an int,
5878 but the comment said it was done only for enums wider than int.
5879 It seems necessary to do this for wide enums,
5880 and best not to change what's done for ordinary narrower ones. */
5881 for (pair = values; pair; pair = TREE_CHAIN (pair))
5883 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5884 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5885 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5886 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5889 /* Replace the decl nodes in VALUES with their names. */
5890 for (pair = values; pair; pair = TREE_CHAIN (pair))
5891 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5893 TYPE_VALUES (enumtype) = values;
5896 /* Fix up all variant types of this enum type. */
5897 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5899 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5900 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5901 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5902 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5903 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5904 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5905 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5906 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5909 /* Finish debugging output for this type. */
5910 rest_of_type_compilation (enumtype, toplevel);
5912 /* This matches a push in start_enum. */
5918 /* Build and install a CONST_DECL for one value of the
5919 current enumeration type (one that was begun with start_enum).
5920 Return a tree-list containing the CONST_DECL and its value.
5921 Assignment of sequential values by default is handled here. */
5924 build_enumerator (name, value)
5927 register tree decl, type;
5929 /* Validate and default VALUE. */
5931 /* Remove no-op casts from the value. */
5933 STRIP_TYPE_NOPS (value);
5937 if (TREE_CODE (value) == INTEGER_CST)
5939 value = default_conversion (value);
5940 constant_expression_warning (value);
5944 error ("enumerator value for `%s' not integer constant",
5945 IDENTIFIER_POINTER (name));
5950 /* Default based on previous value. */
5951 /* It should no longer be possible to have NON_LVALUE_EXPR
5955 value = enum_next_value;
5957 error ("overflow in enumeration values");
5960 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5962 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5963 value = integer_zero_node;
5966 /* Set basis for default for next value. */
5967 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5968 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5970 /* Now create a declaration for the enum value name. */
5972 type = TREE_TYPE (value);
5973 type = type_for_size (MAX (TYPE_PRECISION (type),
5974 TYPE_PRECISION (integer_type_node)),
5976 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5977 && TREE_UNSIGNED (type)));
5979 decl = build_decl (CONST_DECL, name, type);
5980 DECL_INITIAL (decl) = value;
5981 TREE_TYPE (value) = type;
5984 return saveable_tree_cons (decl, value, NULL_TREE);
5987 /* Create the FUNCTION_DECL for a function definition.
5988 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
5989 the declaration; they describe the function's name and the type it returns,
5990 but twisted together in a fashion that parallels the syntax of C.
5992 This function creates a binding context for the function body
5993 as well as setting up the FUNCTION_DECL in current_function_decl.
5995 Returns 1 on success. If the DECLARATOR is not suitable for a function
5996 (it defines a datum instead), we return 0, which tells
5997 yyparse to report a parse error.
5999 NESTED is nonzero for a function nested within another function. */
6002 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6003 tree declarator, declspecs, prefix_attributes, attributes;
6006 tree decl1, old_decl;
6008 int old_immediate_size_expand = immediate_size_expand;
6010 current_function_returns_value = 0; /* Assume, until we see it does. */
6011 current_function_returns_null = 0;
6012 warn_about_return_type = 0;
6013 current_extern_inline = 0;
6014 c_function_varargs = 0;
6016 shadowed_labels = 0;
6018 /* Don't expand any sizes in the return type of the function. */
6019 immediate_size_expand = 0;
6021 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6023 /* If the declarator is not suitable for a function definition,
6024 cause a syntax error. */
6028 decl_attributes (decl1, prefix_attributes, attributes);
6030 announce_function (decl1);
6032 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6034 error ("return-type is an incomplete type");
6035 /* Make it return void instead. */
6037 = build_function_type (void_type_node,
6038 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6041 if (warn_about_return_type)
6042 warning ("return-type defaults to `int'");
6044 /* Save the parm names or decls from this function's declarator
6045 where store_parm_decls will find them. */
6046 current_function_parms = last_function_parms;
6047 current_function_parm_tags = last_function_parm_tags;
6049 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6050 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6051 DECL_INITIAL (decl1) = error_mark_node;
6053 /* If this definition isn't a prototype and we had a prototype declaration
6054 before, copy the arg type info from that prototype.
6055 But not if what we had before was a builtin function. */
6056 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6057 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6058 && !DECL_BUILT_IN (old_decl)
6059 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6060 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6061 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6063 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6064 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6065 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6068 /* If there is no explicit declaration, look for any out-of-scope implicit
6071 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6073 /* Optionally warn of old-fashioned def with no previous prototype. */
6074 if (warn_strict_prototypes
6075 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6076 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6077 warning ("function declaration isn't a prototype");
6078 /* Optionally warn of any global def with no previous prototype. */
6079 else if (warn_missing_prototypes
6080 && TREE_PUBLIC (decl1)
6081 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6082 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6083 warning_with_decl (decl1, "no previous prototype for `%s'");
6084 /* Optionally warn of any def with no previous prototype
6085 if the function has already been used. */
6086 else if (warn_missing_prototypes
6087 && old_decl != 0 && TREE_USED (old_decl)
6088 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6089 warning_with_decl (decl1,
6090 "`%s' was used with no prototype before its definition");
6091 /* Optionally warn of any global def with no previous declaration. */
6092 else if (warn_missing_declarations
6093 && TREE_PUBLIC (decl1)
6095 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6096 warning_with_decl (decl1, "no previous declaration for `%s'");
6097 /* Optionally warn of any def with no previous declaration
6098 if the function has already been used. */
6099 else if (warn_missing_declarations
6100 && old_decl != 0 && TREE_USED (old_decl)
6101 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6102 warning_with_decl (decl1,
6103 "`%s' was used with no declaration before its definition");
6105 /* This is a definition, not a reference.
6106 So normally clear DECL_EXTERNAL.
6107 However, `extern inline' acts like a declaration
6108 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6109 DECL_EXTERNAL (decl1) = current_extern_inline;
6111 /* This function exists in static storage.
6112 (This does not mean `static' in the C sense!) */
6113 TREE_STATIC (decl1) = 1;
6115 /* A nested function is not global. */
6116 if (current_function_decl != 0)
6117 TREE_PUBLIC (decl1) = 0;
6119 /* Record the decl so that the function name is defined.
6120 If we already have a decl for this name, and it is a FUNCTION_DECL,
6121 use the old decl. */
6123 current_function_decl = pushdecl (decl1);
6126 declare_parm_level (1);
6127 current_binding_level->subblocks_tag_transparent = 1;
6129 make_function_rtl (current_function_decl);
6131 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6132 /* Promote the value to int before returning it. */
6133 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6135 /* It retains unsignedness if traditional
6136 or if not really getting wider. */
6137 if (TREE_UNSIGNED (restype)
6138 && (flag_traditional
6139 || (TYPE_PRECISION (restype)
6140 == TYPE_PRECISION (integer_type_node))))
6141 restype = unsigned_type_node;
6143 restype = integer_type_node;
6145 DECL_RESULT (current_function_decl)
6146 = build_decl (RESULT_DECL, NULL_TREE, restype);
6149 /* Allocate further tree nodes temporarily during compilation
6150 of this function only. */
6151 temporary_allocation ();
6153 /* If this fcn was already referenced via a block-scope `extern' decl
6154 (or an implicit decl), propagate certain information about the usage. */
6155 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6156 TREE_ADDRESSABLE (current_function_decl) = 1;
6158 immediate_size_expand = old_immediate_size_expand;
6163 /* Record that this function is going to be a varargs function.
6164 This is called before store_parm_decls, which is too early
6165 to call mark_varargs directly. */
6170 c_function_varargs = 1;
6173 /* Store the parameter declarations into the current function declaration.
6174 This is called after parsing the parameter declarations, before
6175 digesting the body of the function.
6177 For an old-style definition, modify the function's type
6178 to specify at least the number of arguments. */
6183 register tree fndecl = current_function_decl;
6186 /* This is either a chain of PARM_DECLs (if a prototype was used)
6187 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6188 tree specparms = current_function_parms;
6190 /* This is a list of types declared among parms in a prototype. */
6191 tree parmtags = current_function_parm_tags;
6193 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6194 register tree parmdecls = getdecls ();
6196 /* This is a chain of any other decls that came in among the parm
6197 declarations. If a parm is declared with enum {foo, bar} x;
6198 then CONST_DECLs for foo and bar are put here. */
6201 /* Nonzero if this definition is written with a prototype. */
6204 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6206 /* This case is when the function was defined with an ANSI prototype.
6207 The parms already have decls, so we need not do anything here
6208 except record them as in effect
6209 and complain if any redundant old-style parm decls were written. */
6220 error_with_decl (fndecl,
6221 "parm types given both in parmlist and separately");
6222 /* Get rid of the erroneous decls; don't keep them on
6223 the list of parms, since they might not be PARM_DECLs. */
6224 for (decl = current_binding_level->names;
6225 decl; decl = TREE_CHAIN (decl))
6226 if (DECL_NAME (decl))
6227 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6228 for (link = current_binding_level->shadowed;
6229 link; link = TREE_CHAIN (link))
6230 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6231 current_binding_level->names = 0;
6232 current_binding_level->shadowed = 0;
6235 specparms = nreverse (specparms);
6236 for (parm = specparms; parm; parm = next)
6238 next = TREE_CHAIN (parm);
6239 if (TREE_CODE (parm) == PARM_DECL)
6241 if (DECL_NAME (parm) == 0)
6242 error_with_decl (parm, "parameter name omitted");
6243 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6245 error_with_decl (parm, "parameter `%s' declared void");
6246 /* Change the type to error_mark_node so this parameter
6247 will be ignored by assign_parms. */
6248 TREE_TYPE (parm) = error_mark_node;
6254 /* If we find an enum constant or a type tag,
6255 put it aside for the moment. */
6256 TREE_CHAIN (parm) = 0;
6257 others = chainon (others, parm);
6261 /* Get the decls in their original chain order
6262 and record in the function. */
6263 DECL_ARGUMENTS (fndecl) = getdecls ();
6266 /* If this function takes a variable number of arguments,
6267 add a phony parameter to the end of the parm list,
6268 to represent the position of the first unnamed argument. */
6269 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6272 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6273 /* Let's hope the address of the unnamed parm
6274 won't depend on its type. */
6275 TREE_TYPE (dummy) = integer_type_node;
6276 DECL_ARG_TYPE (dummy) = integer_type_node;
6277 DECL_ARGUMENTS (fndecl)
6278 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6282 /* Now pushdecl the enum constants. */
6283 for (parm = others; parm; parm = next)
6285 next = TREE_CHAIN (parm);
6286 if (DECL_NAME (parm) == 0)
6288 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6290 else if (TREE_CODE (parm) != PARM_DECL)
6294 storetags (chainon (parmtags, gettags ()));
6298 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6299 each with a parm name as the TREE_VALUE.
6301 PARMDECLS is a chain of declarations for parameters.
6302 Warning! It can also contain CONST_DECLs which are not parameters
6303 but are names of enumerators of any enum types
6304 declared among the parameters.
6306 First match each formal parameter name with its declaration.
6307 Associate decls with the names and store the decls
6308 into the TREE_PURPOSE slots. */
6310 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6311 DECL_RESULT (parm) = 0;
6313 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6315 register tree tail, found = NULL;
6317 if (TREE_VALUE (parm) == 0)
6319 error_with_decl (fndecl, "parameter name missing from parameter list");
6320 TREE_PURPOSE (parm) = 0;
6324 /* See if any of the parmdecls specifies this parm by name.
6325 Ignore any enumerator decls. */
6326 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6327 if (DECL_NAME (tail) == TREE_VALUE (parm)
6328 && TREE_CODE (tail) == PARM_DECL)
6334 /* If declaration already marked, we have a duplicate name.
6335 Complain, and don't use this decl twice. */
6336 if (found && DECL_RESULT (found) != 0)
6338 error_with_decl (found, "multiple parameters named `%s'");
6342 /* If the declaration says "void", complain and ignore it. */
6343 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6345 error_with_decl (found, "parameter `%s' declared void");
6346 TREE_TYPE (found) = integer_type_node;
6347 DECL_ARG_TYPE (found) = integer_type_node;
6348 layout_decl (found, 0);
6351 /* Traditionally, a parm declared float is actually a double. */
6352 if (found && flag_traditional
6353 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6355 TREE_TYPE (found) = double_type_node;
6356 DECL_ARG_TYPE (found) = double_type_node;
6357 layout_decl (found, 0);
6360 /* If no declaration found, default to int. */
6363 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6365 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6366 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6367 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6369 warning_with_decl (found, "type of `%s' defaults to `int'");
6373 TREE_PURPOSE (parm) = found;
6375 /* Mark this decl as "already found" -- see test, above.
6376 It is safe to use DECL_RESULT for this
6377 since it is not used in PARM_DECLs or CONST_DECLs. */
6378 DECL_RESULT (found) = error_mark_node;
6381 /* Put anything which is on the parmdecls chain and which is
6382 not a PARM_DECL onto the list NONPARMS. (The types of
6383 non-parm things which might appear on the list include
6384 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6385 any actual PARM_DECLs not matched with any names. */
6388 for (parm = parmdecls; parm; )
6390 tree next = TREE_CHAIN (parm);
6391 TREE_CHAIN (parm) = 0;
6393 if (TREE_CODE (parm) != PARM_DECL)
6394 nonparms = chainon (nonparms, parm);
6397 /* Complain about args with incomplete types. */
6398 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6400 error_with_decl (parm, "parameter `%s' has incomplete type");
6401 TREE_TYPE (parm) = error_mark_node;
6404 if (DECL_RESULT (parm) == 0)
6406 error_with_decl (parm,
6407 "declaration for parameter `%s' but no such parameter");
6408 /* Pretend the parameter was not missing.
6409 This gets us to a standard state and minimizes
6410 further error messages. */
6412 = chainon (specparms,
6413 tree_cons (parm, NULL_TREE, NULL_TREE));
6420 /* Chain the declarations together in the order of the list of names. */
6421 /* Store that chain in the function decl, replacing the list of names. */
6423 DECL_ARGUMENTS (fndecl) = 0;
6426 for (last = 0; parm; parm = TREE_CHAIN (parm))
6427 if (TREE_PURPOSE (parm))
6430 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6432 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6433 last = TREE_PURPOSE (parm);
6434 TREE_CHAIN (last) = 0;
6438 /* If there was a previous prototype,
6439 set the DECL_ARG_TYPE of each argument according to
6440 the type previously specified, and report any mismatches. */
6442 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6445 for (parm = DECL_ARGUMENTS (fndecl),
6446 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6447 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6448 != void_type_node));
6449 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6451 if (parm == 0 || type == 0
6452 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6454 error ("number of arguments doesn't match prototype");
6455 error_with_file_and_line (current_function_prototype_file,
6456 current_function_prototype_line,
6457 "prototype declaration");
6460 /* Type for passing arg must be consistent
6461 with that declared for the arg. */
6462 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6464 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6465 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6467 /* Adjust argument to match prototype. E.g. a previous
6468 `int foo(float);' prototype causes
6469 `int foo(x) float x; {...}' to be treated like
6470 `int foo(float x) {...}'. This is particularly
6471 useful for argument types like uid_t. */
6472 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6473 #ifdef PROMOTE_PROTOTYPES
6474 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6475 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6476 && TYPE_PRECISION (TREE_TYPE (parm))
6477 < TYPE_PRECISION (integer_type_node))
6478 DECL_ARG_TYPE (parm) = integer_type_node;
6482 pedwarn ("promoted argument `%s' doesn't match prototype",
6483 IDENTIFIER_POINTER (DECL_NAME (parm)));
6484 warning_with_file_and_line
6485 (current_function_prototype_file,
6486 current_function_prototype_line,
6487 "prototype declaration");
6490 /* If -traditional, allow `int' argument to match
6491 `unsigned' prototype. */
6492 else if (! (flag_traditional
6493 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6494 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6496 error ("argument `%s' doesn't match prototype",
6497 IDENTIFIER_POINTER (DECL_NAME (parm)));
6498 error_with_file_and_line (current_function_prototype_file,
6499 current_function_prototype_line,
6500 "prototype declaration");
6504 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6507 /* Otherwise, create a prototype that would match. */
6511 tree actual = 0, last = 0, type;
6513 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6515 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6518 TREE_CHAIN (last) = type;
6523 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6525 TREE_CHAIN (last) = type;
6529 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6530 of the type of this function, but we need to avoid having this
6531 affect the types of other similarly-typed functions, so we must
6532 first force the generation of an identical (but separate) type
6533 node for the relevant function type. The new node we create
6534 will be a variant of the main variant of the original function
6537 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6539 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6542 /* Now store the final chain of decls for the arguments
6543 as the decl-chain of the current lexical scope.
6544 Put the enumerators in as well, at the front so that
6545 DECL_ARGUMENTS is not modified. */
6547 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6550 /* Make sure the binding level for the top of the function body
6551 gets a BLOCK if there are any in the function.
6552 Otherwise, the dbx output is wrong. */
6554 keep_next_if_subblocks = 1;
6556 /* ??? This might be an improvement,
6557 but needs to be thought about some more. */
6559 keep_next_level_flag = 1;
6562 /* Write a record describing this function definition to the prototypes
6563 file (if requested). */
6565 gen_aux_info_record (fndecl, 1, 0, prototype);
6567 /* Initialize the RTL code for the function. */
6569 init_function_start (fndecl, input_filename, lineno);
6571 /* If this is a varargs function, inform function.c. */
6573 if (c_function_varargs)
6576 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6578 declare_function_name ();
6580 /* Set up parameters and prepare for return, for the function. */
6582 expand_function_start (fndecl, 0);
6584 /* If this function is `main', emit a call to `__main'
6585 to run global initializers, etc. */
6586 if (DECL_NAME (fndecl)
6587 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6588 && DECL_CONTEXT (fndecl) == NULL_TREE)
6589 expand_main_function ();
6592 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6593 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6594 stands for an ellipsis in the identifier list.
6596 PARMLIST is the data returned by get_parm_info for the
6597 parmlist that follows the semicolon.
6599 We return a value of the same sort that get_parm_info returns,
6600 except that it describes the combination of identifiers and parmlist. */
6603 combine_parm_decls (specparms, parmlist, void_at_end)
6604 tree specparms, parmlist;
6607 register tree fndecl = current_function_decl;
6610 tree parmdecls = TREE_PURPOSE (parmlist);
6612 /* This is a chain of any other decls that came in among the parm
6613 declarations. They were separated already by get_parm_info,
6614 so we just need to keep them separate. */
6615 tree nonparms = TREE_VALUE (parmlist);
6619 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6620 DECL_RESULT (parm) = 0;
6622 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6624 register tree tail, found = NULL;
6626 /* See if any of the parmdecls specifies this parm by name. */
6627 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6628 if (DECL_NAME (tail) == TREE_VALUE (parm))
6634 /* If declaration already marked, we have a duplicate name.
6635 Complain, and don't use this decl twice. */
6636 if (found && DECL_RESULT (found) != 0)
6638 error_with_decl (found, "multiple parameters named `%s'");
6642 /* If the declaration says "void", complain and ignore it. */
6643 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6645 error_with_decl (found, "parameter `%s' declared void");
6646 TREE_TYPE (found) = integer_type_node;
6647 DECL_ARG_TYPE (found) = integer_type_node;
6648 layout_decl (found, 0);
6651 /* Traditionally, a parm declared float is actually a double. */
6652 if (found && flag_traditional
6653 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6655 TREE_TYPE (found) = double_type_node;
6656 DECL_ARG_TYPE (found) = double_type_node;
6657 layout_decl (found, 0);
6660 /* If no declaration found, default to int. */
6663 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6665 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6666 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6667 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6668 error_with_decl (found, "type of parameter `%s' is not declared");
6672 TREE_PURPOSE (parm) = found;
6674 /* Mark this decl as "already found" -- see test, above.
6675 It is safe to use DECL_RESULT for this
6676 since it is not used in PARM_DECLs or CONST_DECLs. */
6677 DECL_RESULT (found) = error_mark_node;
6680 /* Complain about any actual PARM_DECLs not matched with any names. */
6682 for (parm = parmdecls; parm; )
6684 tree next = TREE_CHAIN (parm);
6685 TREE_CHAIN (parm) = 0;
6687 /* Complain about args with incomplete types. */
6688 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6690 error_with_decl (parm, "parameter `%s' has incomplete type");
6691 TREE_TYPE (parm) = error_mark_node;
6694 if (DECL_RESULT (parm) == 0)
6696 error_with_decl (parm,
6697 "declaration for parameter `%s' but no such parameter");
6698 /* Pretend the parameter was not missing.
6699 This gets us to a standard state and minimizes
6700 further error messages. */
6702 = chainon (specparms,
6703 tree_cons (parm, NULL_TREE, NULL_TREE));
6709 /* Chain the declarations together in the order of the list of names.
6710 At the same time, build up a list of their types, in reverse order. */
6716 for (last = 0; parm; parm = TREE_CHAIN (parm))
6717 if (TREE_PURPOSE (parm))
6720 parmdecls = TREE_PURPOSE (parm);
6722 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6723 last = TREE_PURPOSE (parm);
6724 TREE_CHAIN (last) = 0;
6726 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6731 return saveable_tree_cons (parmdecls, nonparms,
6732 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6734 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6737 /* Finish up a function declaration and compile that function
6738 all the way to assembler language output. The free the storage
6739 for the function definition.
6741 This is called after parsing the body of the function definition.
6743 NESTED is nonzero if the function being finished is nested in another. */
6746 finish_function (nested)
6749 register tree fndecl = current_function_decl;
6751 /* TREE_READONLY (fndecl) = 1;
6752 This caused &foo to be of type ptr-to-const-function
6753 which then got a warning when stored in a ptr-to-function variable. */
6756 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6758 /* Must mark the RESULT_DECL as being in this function. */
6760 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6762 /* Obey `register' declarations if `setjmp' is called in this fn. */
6763 if (flag_traditional && current_function_calls_setjmp)
6765 setjmp_protect (DECL_INITIAL (fndecl));
6766 setjmp_protect_args ();
6769 #ifdef DEFAULT_MAIN_RETURN
6770 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6772 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6773 != integer_type_node)
6774 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6777 /* Make it so that `main' always returns success by default. */
6778 DEFAULT_MAIN_RETURN;
6783 /* Generate rtl for function exit. */
6784 expand_function_end (input_filename, lineno, 0);
6786 /* So we can tell if jump_optimize sets it to 1. */
6789 /* Run the optimizers and output the assembler code for this function. */
6790 rest_of_compilation (fndecl);
6792 current_function_returns_null |= can_reach_end;
6794 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6795 warning ("`noreturn' function does return");
6796 else if (warn_return_type && can_reach_end
6797 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6798 /* If this function returns non-void and control can drop through,
6800 warning ("control reaches end of non-void function");
6801 /* With just -W, complain only if function returns both with
6802 and without a value. */
6803 else if (extra_warnings
6804 && current_function_returns_value && current_function_returns_null)
6805 warning ("this function may return with or without a value");
6807 /* If requested, warn about function definitions where the function will
6808 return a value (usually of some struct or union type) which itself will
6809 take up a lot of stack space. */
6811 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6813 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6817 register tree ret_type_size = TYPE_SIZE (ret_type);
6819 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6822 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6824 if (units > larger_than_size)
6825 warning_with_decl (fndecl,
6826 "size of return value of `%s' is %u bytes",
6832 /* Free all the tree nodes making up this function. */
6833 /* Switch back to allocating nodes permanently
6834 until we start another function. */
6836 permanent_allocation (1);
6838 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6840 /* Stop pointing to the local nodes about to be freed. */
6841 /* But DECL_INITIAL must remain nonzero so we know this
6842 was an actual function definition. */
6843 /* For a nested function, this is done in pop_c_function_context. */
6844 /* If rest_of_compilation set this to 0, leave it 0. */
6845 if (DECL_INITIAL (fndecl) != 0)
6846 DECL_INITIAL (fndecl) = error_mark_node;
6847 DECL_ARGUMENTS (fndecl) = 0;
6850 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6852 #ifndef ASM_OUTPUT_CONSTRUCTOR
6853 if (! flag_gnu_linker)
6854 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
6857 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6859 if (DECL_STATIC_DESTRUCTOR (fndecl))
6861 #ifndef ASM_OUTPUT_DESTRUCTOR
6862 if (! flag_gnu_linker)
6863 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
6866 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
6871 /* Let the error reporting routines know that we're outside a
6872 function. For a nested function, this value is used in
6873 pop_c_function_context and then reset via pop_function_context. */
6874 current_function_decl = NULL;
6878 /* Save and restore the variables in this file and elsewhere
6879 that keep track of the progress of compilation of the current function.
6880 Used for nested functions. */
6884 struct c_function *next;
6886 tree shadowed_labels;
6889 int warn_about_return_type;
6891 struct binding_level *binding_level;
6894 struct c_function *c_function_chain;
6896 /* Save and reinitialize the variables
6897 used during compilation of a C function. */
6900 push_c_function_context ()
6902 struct c_function *p
6903 = (struct c_function *) xmalloc (sizeof (struct c_function));
6906 pedwarn ("ANSI C forbids nested functions");
6908 push_function_context ();
6910 p->next = c_function_chain;
6911 c_function_chain = p;
6913 p->named_labels = named_labels;
6914 p->shadowed_labels = shadowed_labels;
6915 p->returns_value = current_function_returns_value;
6916 p->returns_null = current_function_returns_null;
6917 p->warn_about_return_type = warn_about_return_type;
6918 p->extern_inline = current_extern_inline;
6919 p->binding_level = current_binding_level;
6922 /* Restore the variables used during compilation of a C function. */
6925 pop_c_function_context ()
6927 struct c_function *p = c_function_chain;
6930 /* Bring back all the labels that were shadowed. */
6931 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6932 if (DECL_NAME (TREE_VALUE (link)) != 0)
6933 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6934 = TREE_VALUE (link);
6936 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6938 /* Stop pointing to the local nodes about to be freed. */
6939 /* But DECL_INITIAL must remain nonzero so we know this
6940 was an actual function definition. */
6941 DECL_INITIAL (current_function_decl) = error_mark_node;
6942 DECL_ARGUMENTS (current_function_decl) = 0;
6945 pop_function_context ();
6947 c_function_chain = p->next;
6949 named_labels = p->named_labels;
6950 shadowed_labels = p->shadowed_labels;
6951 current_function_returns_value = p->returns_value;
6952 current_function_returns_null = p->returns_null;
6953 warn_about_return_type = p->warn_about_return_type;
6954 current_extern_inline = p->extern_inline;
6955 current_binding_level = p->binding_level;
6960 /* integrate_decl_tree calls this function, but since we don't use the
6961 DECL_LANG_SPECIFIC field, this is a no-op. */
6964 copy_lang_decl (node)