1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
35 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
37 { NORMAL, /* Ordinary declaration */
38 FUNCDEF, /* Function definition */
39 PARM, /* Declaration of parm before function body */
40 FIELD, /* Declaration inside struct or union */
41 BITFIELD, /* Likewise but with specified width */
42 TYPENAME}; /* Typename (inside cast or sizeof) */
44 #ifndef CHAR_TYPE_SIZE
45 #define CHAR_TYPE_SIZE BITS_PER_UNIT
48 #ifndef SHORT_TYPE_SIZE
49 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
53 #define INT_TYPE_SIZE BITS_PER_WORD
56 #ifndef LONG_TYPE_SIZE
57 #define LONG_TYPE_SIZE BITS_PER_WORD
60 #ifndef LONG_LONG_TYPE_SIZE
61 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
64 #ifndef WCHAR_UNSIGNED
65 #define WCHAR_UNSIGNED 0
68 #ifndef FLOAT_TYPE_SIZE
69 #define FLOAT_TYPE_SIZE BITS_PER_WORD
72 #ifndef DOUBLE_TYPE_SIZE
73 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
76 #ifndef LONG_DOUBLE_TYPE_SIZE
77 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
80 /* We let tm.h override the types used here, to handle trivial differences
81 such as the choice of unsigned int or long unsigned int for size_t.
82 When machines start needing nontrivial differences in the size type,
83 it would be best to do something here to figure out automatically
84 from other information what type to use. */
87 #define SIZE_TYPE "long unsigned int"
91 #define PTRDIFF_TYPE "long int"
95 #define WCHAR_TYPE "int"
98 /* a node which has tree code ERROR_MARK, and whose type is itself.
99 All erroneous expressions are replaced with this node. All functions
100 that accept nodes as arguments should avoid generating error messages
101 if this node is one of the arguments, since it is undesirable to get
102 multiple error messages from one error in the input. */
104 tree error_mark_node;
106 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
108 tree short_integer_type_node;
109 tree integer_type_node;
110 tree long_integer_type_node;
111 tree long_long_integer_type_node;
113 tree short_unsigned_type_node;
114 tree unsigned_type_node;
115 tree long_unsigned_type_node;
116 tree long_long_unsigned_type_node;
118 tree ptrdiff_type_node;
120 tree unsigned_char_type_node;
121 tree signed_char_type_node;
123 tree wchar_type_node;
124 tree signed_wchar_type_node;
125 tree unsigned_wchar_type_node;
127 tree float_type_node;
128 tree double_type_node;
129 tree long_double_type_node;
131 tree intQI_type_node;
132 tree intHI_type_node;
133 tree intSI_type_node;
134 tree intDI_type_node;
136 tree unsigned_intQI_type_node;
137 tree unsigned_intHI_type_node;
138 tree unsigned_intSI_type_node;
139 tree unsigned_intDI_type_node;
141 /* a VOID_TYPE node. */
145 /* Nodes for types `void *' and `const void *'. */
147 tree ptr_type_node, const_ptr_type_node;
149 /* Nodes for types `char *' and `const char *'. */
151 tree string_type_node, const_string_type_node;
153 /* Type `char[256]' or something like it.
154 Used when an array of char is needed and the size is irrelevant. */
156 tree char_array_type_node;
158 /* Type `int[256]' or something like it.
159 Used when an array of int needed and the size is irrelevant. */
161 tree int_array_type_node;
163 /* Type `wchar_t[256]' or something like it.
164 Used when a wide string literal is created. */
166 tree wchar_array_type_node;
168 /* type `int ()' -- used for implicit declaration of functions. */
170 tree default_function_type;
172 /* function types `double (double)' and `double (double, double)', etc. */
174 tree double_ftype_double, double_ftype_double_double;
175 tree int_ftype_int, long_ftype_long;
177 /* Function type `void (void *, void *, int)' and similar ones */
179 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
181 /* Function type `char *(char *, char *)' and similar ones */
182 tree string_ftype_ptr_ptr, int_ftype_string_string;
184 /* Function type `int (const void *, const void *, size_t)' */
185 tree int_ftype_cptr_cptr_sizet;
187 /* Two expressions that are constants with value zero.
188 The first is of type `int', the second of type `void *'. */
190 tree integer_zero_node;
191 tree null_pointer_node;
193 /* A node for the integer constant 1. */
195 tree integer_one_node;
197 /* Nonzero if we have seen an invalid cross reference
198 to a struct, union, or enum, but not yet printed the message. */
200 tree pending_invalid_xref;
201 /* File and line to appear in the eventual error message. */
202 char *pending_invalid_xref_file;
203 int pending_invalid_xref_line;
205 /* While defining an enum type, this is 1 plus the last enumerator
208 static tree enum_next_value;
210 /* Nonzero means that there was overflow computing enum_next_value. */
212 static int enum_overflow;
214 /* Parsing a function declarator leaves a list of parameter names
215 or a chain or parameter decls here. */
217 static tree last_function_parms;
219 /* Parsing a function declarator leaves here a chain of structure
220 and enum types declared in the parmlist. */
222 static tree last_function_parm_tags;
224 /* After parsing the declarator that starts a function definition,
225 `start_function' puts here the list of parameter names or chain of decls.
226 `store_parm_decls' finds it here. */
228 static tree current_function_parms;
230 /* Similar, for last_function_parm_tags. */
231 static tree current_function_parm_tags;
233 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
234 that have names. Here so we can clear out their names' definitions
235 at the end of the function. */
237 static tree named_labels;
239 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
241 static tree shadowed_labels;
243 /* Nonzero when store_parm_decls is called indicates a varargs function.
244 Value not meaningful after store_parm_decls. */
246 static int c_function_varargs;
248 /* The FUNCTION_DECL for the function currently being compiled,
249 or 0 if between functions. */
250 tree current_function_decl;
252 /* Set to 0 at beginning of a function definition, set to 1 if
253 a return statement that specifies a return value is seen. */
255 int current_function_returns_value;
257 /* Set to 0 at beginning of a function definition, set to 1 if
258 a return statement with no argument is seen. */
260 int current_function_returns_null;
262 /* Set to nonzero by `grokdeclarator' for a function
263 whose return type is defaulted, if warnings for this are desired. */
265 static int warn_about_return_type;
267 /* Nonzero when starting a function declared `extern inline'. */
269 static int current_extern_inline;
271 /* For each binding contour we allocate a binding_level structure
272 * which records the names defined in that contour.
275 * 1) one for each function definition,
276 * where internal declarations of the parameters appear.
277 * 2) one for each compound statement,
278 * to record its declarations.
280 * The current meaning of a name can be found by searching the levels from
281 * the current one out to the global one.
284 /* Note that the information in the `names' component of the global contour
285 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
289 /* A chain of _DECL nodes for all variables, constants, functions,
290 and typedef types. These are in the reverse of the order supplied.
294 /* A list of structure, union and enum definitions,
295 * for looking up tag names.
296 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
297 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
298 * or ENUMERAL_TYPE node.
302 /* For each level, a list of shadowed outer-level local definitions
303 to be restored when this level is popped.
304 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
305 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
308 /* For each level (except not the global one),
309 a chain of BLOCK nodes for all the levels
310 that were entered and exited one level down. */
313 /* The BLOCK node for this level, if one has been preallocated.
314 If 0, the BLOCK is allocated (if needed) when the level is popped. */
317 /* The binding level which this one is contained in (inherits from). */
318 struct binding_level *level_chain;
320 /* Nonzero for the level that holds the parameters of a function. */
321 /* 2 for a definition, 1 for a declaration. */
324 /* Nonzero if this level "doesn't exist" for tags. */
325 char tag_transparent;
327 /* Nonzero if sublevels of this level "don't exist" for tags.
328 This is set in the parm level of a function definition
329 while reading the function body, so that the outermost block
330 of the function body will be tag-transparent. */
331 char subblocks_tag_transparent;
333 /* Nonzero means make a BLOCK for this level regardless of all else. */
336 /* Nonzero means make a BLOCK if this level has any subblocks. */
337 char keep_if_subblocks;
339 /* Number of decls in `names' that have incomplete
340 structure or union types. */
343 /* A list of decls giving the (reversed) specified order of parms,
344 not including any forward-decls in the parmlist.
345 This is so we can put the parms in proper order for assign_parms. */
349 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
351 /* The binding level currently in effect. */
353 static struct binding_level *current_binding_level;
355 /* A chain of binding_level structures awaiting reuse. */
357 static struct binding_level *free_binding_level;
359 /* The outermost binding level, for names of file scope.
360 This is created when the compiler is started and exists
361 through the entire run. */
363 static struct binding_level *global_binding_level;
365 /* Binding level structures are initialized by copying this one. */
367 static struct binding_level clear_binding_level
368 = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0};
370 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
372 static int keep_next_level_flag;
374 /* Nonzero means make a BLOCK for the next level pushed
375 if it has subblocks. */
377 static int keep_next_if_subblocks;
379 /* The chain of outer levels of label scopes.
380 This uses the same data structure used for binding levels,
381 but it works differently: each link in the chain records
382 saved values of named_labels and shadowed_labels for
383 a label binding level outside the current one. */
385 static struct binding_level *label_level_chain;
387 /* Forward declarations. */
389 static tree grokparms (), grokdeclarator ();
391 tree builtin_function ();
392 void shadow_tag_warned ();
394 static tree lookup_tag ();
395 static tree lookup_tag_reverse ();
396 static tree lookup_name_current_level ();
397 static char *redeclaration_error_message ();
398 static void layout_array_type ();
400 /* C-specific option variables. */
402 /* Nonzero means allow type mismatches in conditional expressions;
403 just make their values `void'. */
405 int flag_cond_mismatch;
407 /* Nonzero means give `double' the same size as `float'. */
409 int flag_short_double;
411 /* Nonzero means don't recognize the keyword `asm'. */
415 /* Nonzero means don't recognize any builtin functions. */
419 /* Nonzero means don't recognize the non-ANSI builtin functions.
422 int flag_no_nonansi_builtin;
424 /* Nonzero means do some things the same way PCC does. */
426 int flag_traditional;
428 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
430 int flag_signed_bitfields = 1;
431 int explicit_flag_signed_bitfields = 0;
433 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
435 int flag_no_ident = 0;
437 /* Nonzero means warn about implicit declarations. */
441 /* Nonzero means give string constants the type `const char *'
442 to get extra warnings from them. These warnings will be too numerous
443 to be useful, except in thoroughly ANSIfied programs. */
445 int warn_write_strings;
447 /* Nonzero means warn about pointer casts that can drop a type qualifier
448 from the pointer target type. */
452 /* Warn about traditional constructs whose meanings changed in ANSI C. */
454 int warn_traditional;
456 /* Nonzero means warn about sizeof(function) or addition/subtraction
457 of function pointers. */
459 int warn_pointer_arith;
461 /* Nonzero means warn for non-prototype function decls
462 or non-prototyped defs without previous prototype. */
464 int warn_strict_prototypes;
466 /* Nonzero means warn for any global function def
467 without separate previous prototype decl. */
469 int warn_missing_prototypes;
471 /* Nonzero means warn about multiple (redundant) decls for the same single
472 variable or function. */
474 int warn_redundant_decls = 0;
476 /* Nonzero means warn about extern declarations of objects not at
477 file-scope level and about *all* declarations of functions (whether
478 extern or static) not at file-scope level. Note that we exclude
479 implicit function declarations. To get warnings about those, use
482 int warn_nested_externs = 0;
484 /* Warn about *printf or *scanf format/argument anomalies. */
488 /* Warn about a subscript that has type char. */
490 int warn_char_subscripts = 0;
492 /* Warn if a type conversion is done that might have confusing results. */
496 /* Warn if adding () is suggested. */
498 int warn_parentheses;
500 /* Nonzero means `$' can be in an identifier.
501 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
503 #ifndef DOLLARS_IN_IDENTIFIERS
504 #define DOLLARS_IN_IDENTIFIERS 1
506 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
508 char *language_string = "GNU C";
510 /* Decode the string P as a language-specific option for C.
511 Return 1 if it is recognized (and handle it);
512 return 0 if not recognized. */
518 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
520 flag_traditional = 1;
521 flag_writable_strings = 1;
522 #if DOLLARS_IN_IDENTIFIERS > 0
523 dollars_in_ident = 1;
526 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
528 flag_traditional = 0;
529 flag_writable_strings = 0;
530 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
532 else if (!strcmp (p, "-fsigned-char"))
533 flag_signed_char = 1;
534 else if (!strcmp (p, "-funsigned-char"))
535 flag_signed_char = 0;
536 else if (!strcmp (p, "-fno-signed-char"))
537 flag_signed_char = 0;
538 else if (!strcmp (p, "-fno-unsigned-char"))
539 flag_signed_char = 1;
540 else if (!strcmp (p, "-fsigned-bitfields")
541 || !strcmp (p, "-fno-unsigned-bitfields"))
543 flag_signed_bitfields = 1;
544 explicit_flag_signed_bitfields = 1;
546 else if (!strcmp (p, "-funsigned-bitfields")
547 || !strcmp (p, "-fno-signed-bitfields"))
549 flag_signed_bitfields = 0;
550 explicit_flag_signed_bitfields = 1;
552 else if (!strcmp (p, "-fshort-enums"))
553 flag_short_enums = 1;
554 else if (!strcmp (p, "-fno-short-enums"))
555 flag_short_enums = 0;
556 else if (!strcmp (p, "-fcond-mismatch"))
557 flag_cond_mismatch = 1;
558 else if (!strcmp (p, "-fno-cond-mismatch"))
559 flag_cond_mismatch = 0;
560 else if (!strcmp (p, "-fshort-double"))
561 flag_short_double = 1;
562 else if (!strcmp (p, "-fno-short-double"))
563 flag_short_double = 0;
564 else if (!strcmp (p, "-fasm"))
566 else if (!strcmp (p, "-fno-asm"))
568 else if (!strcmp (p, "-fbuiltin"))
570 else if (!strcmp (p, "-fno-builtin"))
572 else if (!strcmp (p, "-fno-ident"))
574 else if (!strcmp (p, "-fident"))
576 else if (!strcmp (p, "-ansi"))
577 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
578 else if (!strcmp (p, "-Wimplicit"))
580 else if (!strcmp (p, "-Wno-implicit"))
582 else if (!strcmp (p, "-Wwrite-strings"))
583 warn_write_strings = 1;
584 else if (!strcmp (p, "-Wno-write-strings"))
585 warn_write_strings = 0;
586 else if (!strcmp (p, "-Wcast-qual"))
588 else if (!strcmp (p, "-Wno-cast-qual"))
590 else if (!strcmp (p, "-Wpointer-arith"))
591 warn_pointer_arith = 1;
592 else if (!strcmp (p, "-Wno-pointer-arith"))
593 warn_pointer_arith = 0;
594 else if (!strcmp (p, "-Wstrict-prototypes"))
595 warn_strict_prototypes = 1;
596 else if (!strcmp (p, "-Wno-strict-prototypes"))
597 warn_strict_prototypes = 0;
598 else if (!strcmp (p, "-Wmissing-prototypes"))
599 warn_missing_prototypes = 1;
600 else if (!strcmp (p, "-Wno-missing-prototypes"))
601 warn_missing_prototypes = 0;
602 else if (!strcmp (p, "-Wredundant-decls"))
603 warn_redundant_decls = 1;
604 else if (!strcmp (p, "-Wno-redundant-decls"))
605 warn_redundant_decls = 0;
606 else if (!strcmp (p, "-Wnested-externs"))
607 warn_nested_externs = 1;
608 else if (!strcmp (p, "-Wno-nested-externs"))
609 warn_nested_externs = 0;
610 else if (!strcmp (p, "-Wtraditional"))
611 warn_traditional = 1;
612 else if (!strcmp (p, "-Wno-traditional"))
613 warn_traditional = 0;
614 else if (!strcmp (p, "-Wformat"))
616 else if (!strcmp (p, "-Wno-format"))
618 else if (!strcmp (p, "-Wchar-subscripts"))
619 warn_char_subscripts = 1;
620 else if (!strcmp (p, "-Wno-char-subscripts"))
621 warn_char_subscripts = 0;
622 else if (!strcmp (p, "-Wconversion"))
624 else if (!strcmp (p, "-Wno-conversion"))
626 else if (!strcmp (p, "-Wparentheses"))
627 warn_parentheses = 1;
628 else if (!strcmp (p, "-Wno-parentheses"))
629 warn_parentheses = 0;
630 else if (!strcmp (p, "-Wreturn-type"))
631 warn_return_type = 1;
632 else if (!strcmp (p, "-Wno-return-type"))
633 warn_return_type = 0;
634 else if (!strcmp (p, "-Wcomment"))
635 ; /* cpp handles this one. */
636 else if (!strcmp (p, "-Wno-comment"))
637 ; /* cpp handles this one. */
638 else if (!strcmp (p, "-Wcomments"))
639 ; /* cpp handles this one. */
640 else if (!strcmp (p, "-Wno-comments"))
641 ; /* cpp handles this one. */
642 else if (!strcmp (p, "-Wtrigraphs"))
643 ; /* cpp handles this one. */
644 else if (!strcmp (p, "-Wno-trigraphs"))
645 ; /* cpp handles this one. */
646 else if (!strcmp (p, "-Wimport"))
647 ; /* cpp handles this one. */
648 else if (!strcmp (p, "-Wno-import"))
649 ; /* cpp handles this one. */
650 else if (!strcmp (p, "-Wall"))
653 /* We save the value of warn_uninitialized, since if they put
654 -Wuninitialized on the command line, we need to generate a
655 warning about not using it without also specifying -O. */
656 if (warn_uninitialized != 1)
657 warn_uninitialized = 2;
659 warn_return_type = 1;
663 warn_char_subscripts = 1;
664 warn_parentheses = 1;
672 /* Hooks for print_node. */
685 print_lang_identifier (file, node, indent)
690 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
691 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
692 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
693 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
694 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
695 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
698 /* Create a new `struct binding_level'. */
701 struct binding_level *
702 make_binding_level ()
705 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
708 /* Nonzero if we are currently in the global binding level. */
713 return current_binding_level == global_binding_level;
719 keep_next_level_flag = 1;
722 /* Nonzero if the current level needs to have a BLOCK made. */
727 return ((current_binding_level->keep_if_subblocks
728 && current_binding_level->blocks != 0)
729 || current_binding_level->keep
730 || current_binding_level->names != 0
731 || (current_binding_level->tags != 0
732 && !current_binding_level->tag_transparent));
735 /* Identify this binding level as a level of parameters.
736 DEFINITION_FLAG is 1 for a definition, 0 for a declaration. */
739 declare_parm_level (definition_flag)
742 current_binding_level->parm_flag = 1 + definition_flag;
745 /* Nonzero if currently making parm declarations. */
750 return current_binding_level->parm_flag;
753 /* Enter a new binding level.
754 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
755 not for that of tags. */
758 pushlevel (tag_transparent)
761 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
763 /* If this is the top level of a function,
764 just make sure that NAMED_LABELS is 0. */
766 if (current_binding_level == global_binding_level)
771 /* Reuse or create a struct for this binding level. */
773 if (free_binding_level)
775 newlevel = free_binding_level;
776 free_binding_level = free_binding_level->level_chain;
780 newlevel = make_binding_level ();
783 /* Add this level to the front of the chain (stack) of levels that
786 *newlevel = clear_binding_level;
787 newlevel->tag_transparent
789 || (current_binding_level
790 ? current_binding_level->subblocks_tag_transparent
792 newlevel->level_chain = current_binding_level;
793 current_binding_level = newlevel;
794 newlevel->keep = keep_next_level_flag;
795 keep_next_level_flag = 0;
796 newlevel->keep_if_subblocks = keep_next_if_subblocks;
797 keep_next_if_subblocks = 0;
800 /* Exit a binding level.
801 Pop the level off, and restore the state of the identifier-decl mappings
802 that were in effect when this level was entered.
804 If KEEP is nonzero, this level had explicit declarations, so
805 and create a "block" (a BLOCK node) for the level
806 to record its declarations and subblocks for symbol table output.
808 If FUNCTIONBODY is nonzero, this level is the body of a function,
809 so create a block as if KEEP were set and also clear out all
812 If REVERSE is nonzero, reverse the order of decls before putting
813 them into the BLOCK. */
816 poplevel (keep, reverse, functionbody)
822 /* The chain of decls was accumulated in reverse order.
823 Put it into forward order, just for cleanliness. */
825 tree tags = current_binding_level->tags;
826 tree subblocks = current_binding_level->blocks;
829 int block_previously_created;
831 keep |= current_binding_level->keep;
833 /* This warning is turned off because it causes warnings for
834 declarations like `extern struct foo *x'. */
836 /* Warn about incomplete structure types in this level. */
837 for (link = tags; link; link = TREE_CHAIN (link))
838 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
840 tree type = TREE_VALUE (link);
842 switch (TREE_CODE (type))
845 errmsg = "`struct %s' incomplete in scope ending here";
848 errmsg = "`union %s' incomplete in scope ending here";
851 errmsg = "`enum %s' incomplete in scope ending here";
854 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
855 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
857 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
858 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
862 /* Get the decls in the order they were written.
863 Usually current_binding_level->names is in reverse order.
864 But parameter decls were previously put in forward order. */
867 current_binding_level->names
868 = decls = nreverse (current_binding_level->names);
870 decls = current_binding_level->names;
872 /* Output any nested inline functions within this block
873 if they weren't already output. */
875 for (decl = decls; decl; decl = TREE_CHAIN (decl))
876 if (TREE_CODE (decl) == FUNCTION_DECL
877 && ! TREE_ASM_WRITTEN (decl)
878 && DECL_INITIAL (decl) != 0
879 && TREE_ADDRESSABLE (decl))
881 /* If this decl was copied from a file-scope decl
882 on account of a block-scope extern decl,
883 propagate TREE_ADDRESSABLE to the file-scope decl. */
884 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
885 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
887 output_inline_function (decl);
890 /* If there were any declarations or structure tags in that level,
891 or if this level is a function body,
892 create a BLOCK to record them for the life of this function. */
895 block_previously_created = (current_binding_level->this_block != 0);
896 if (block_previously_created)
897 block = current_binding_level->this_block;
898 else if (keep || functionbody
899 || (current_binding_level->keep_if_subblocks && subblocks != 0))
900 block = make_node (BLOCK);
903 BLOCK_VARS (block) = decls;
904 BLOCK_TYPE_TAGS (block) = tags;
905 BLOCK_SUBBLOCKS (block) = subblocks;
906 remember_end_note (block);
909 /* In each subblock, record that this is its superior. */
911 for (link = subblocks; link; link = TREE_CHAIN (link))
912 BLOCK_SUPERCONTEXT (link) = block;
914 /* Clear out the meanings of the local variables of this level. */
916 for (link = decls; link; link = TREE_CHAIN (link))
918 if (DECL_NAME (link) != 0)
920 /* If the ident. was used or addressed via a local extern decl,
921 don't forget that fact. */
922 if (DECL_EXTERNAL (link))
924 if (TREE_USED (link))
925 TREE_USED (DECL_NAME (link)) = 1;
926 if (TREE_ADDRESSABLE (link))
927 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
929 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
933 /* Restore all name-meanings of the outer levels
934 that were shadowed by this level. */
936 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
937 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
939 /* If the level being exited is the top level of a function,
940 check over all the labels, and clear out the current
941 (function local) meanings of their names. */
945 /* If this is the top level block of a function,
946 the vars are the function's parameters.
947 Don't leave them in the BLOCK because they are
948 found in the FUNCTION_DECL instead. */
950 BLOCK_VARS (block) = 0;
952 /* Clear out the definitions of all label names,
953 since their scopes end here,
954 and add them to BLOCK_VARS. */
956 for (link = named_labels; link; link = TREE_CHAIN (link))
958 register tree label = TREE_VALUE (link);
960 if (DECL_INITIAL (label) == 0)
962 error_with_decl (label, "label `%s' used but not defined");
963 /* Avoid crashing later. */
964 define_label (input_filename, lineno,
967 else if (warn_unused && !TREE_USED (label))
968 warning_with_decl (label, "label `%s' defined but not used");
969 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
971 /* Put the labels into the "variables" of the
972 top-level block, so debugger can see them. */
973 TREE_CHAIN (label) = BLOCK_VARS (block);
974 BLOCK_VARS (block) = label;
978 /* Pop the current level, and free the structure for reuse. */
981 register struct binding_level *level = current_binding_level;
982 current_binding_level = current_binding_level->level_chain;
984 level->level_chain = free_binding_level;
985 free_binding_level = level;
988 /* Dispose of the block that we just made inside some higher level. */
990 DECL_INITIAL (current_function_decl) = block;
993 if (!block_previously_created)
994 current_binding_level->blocks
995 = chainon (current_binding_level->blocks, block);
997 /* If we did not make a block for the level just exited,
998 any blocks made for inner levels
999 (since they cannot be recorded as subblocks in that level)
1000 must be carried forward so they will later become subblocks
1001 of something else. */
1003 current_binding_level->blocks
1004 = chainon (current_binding_level->blocks, subblocks);
1006 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1007 binding contour so that they point to the appropriate construct, i.e.
1008 either to the current FUNCTION_DECL node, or else to the BLOCK node
1009 we just constructed.
1011 Note that for tagged types whose scope is just the formal parameter
1012 list for some function type specification, we can't properly set
1013 their TYPE_CONTEXTs here, because we don't have a pointer to the
1014 appropriate FUNCTION_TYPE node readily available to us. For those
1015 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1016 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1017 node which will represent the "scope" for these "parameter list local"
1022 for (link = tags; link; link = TREE_CHAIN (link))
1023 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1025 for (link = tags; link; link = TREE_CHAIN (link))
1026 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1029 TREE_USED (block) = 1;
1033 /* Delete the node BLOCK from the current binding level.
1034 This is used for the block inside a stmt expr ({...})
1035 so that the block can be reinserted where appropriate. */
1038 delete_block (block)
1042 if (current_binding_level->blocks == block)
1043 current_binding_level->blocks = TREE_CHAIN (block);
1044 for (t = current_binding_level->blocks; t;)
1046 if (TREE_CHAIN (t) == block)
1047 TREE_CHAIN (t) = TREE_CHAIN (block);
1051 TREE_CHAIN (block) = NULL;
1052 /* Clear TREE_USED which is always set by poplevel.
1053 The flag is set again if insert_block is called. */
1054 TREE_USED (block) = 0;
1057 /* Insert BLOCK at the end of the list of subblocks of the
1058 current binding level. This is used when a BIND_EXPR is expanded,
1059 to handle the BLOCK node inside teh BIND_EXPR. */
1062 insert_block (block)
1065 TREE_USED (block) = 1;
1066 current_binding_level->blocks
1067 = chainon (current_binding_level->blocks, block);
1070 /* Set the BLOCK node for the innermost scope
1071 (the one we are currently in). */
1075 register tree block;
1077 current_binding_level->this_block = block;
1083 register struct binding_level *newlevel;
1085 /* Reuse or create a struct for this binding level. */
1087 if (free_binding_level)
1089 newlevel = free_binding_level;
1090 free_binding_level = free_binding_level->level_chain;
1094 newlevel = make_binding_level ();
1097 /* Add this level to the front of the chain (stack) of label levels. */
1099 newlevel->level_chain = label_level_chain;
1100 label_level_chain = newlevel;
1102 newlevel->names = named_labels;
1103 newlevel->shadowed = shadowed_labels;
1105 shadowed_labels = 0;
1111 register struct binding_level *level = label_level_chain;
1114 /* Clear out the definitions of the declared labels in this level.
1115 Leave in the list any ordinary, non-declared labels. */
1116 for (link = named_labels, prev = 0; link;)
1118 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1120 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1122 error_with_decl ("label `%s' used but not defined",
1124 /* Avoid crashing later. */
1125 define_label (input_filename, lineno,
1126 DECL_NAME (TREE_VALUE (link)));
1128 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1129 warning_with_decl (TREE_VALUE (link),
1130 "label `%s' defined but not used");
1131 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1133 /* Delete this element from the list. */
1134 link = TREE_CHAIN (link);
1136 TREE_CHAIN (prev) = link;
1138 named_labels = link;
1143 link = TREE_CHAIN (link);
1147 /* Bring back all the labels that were shadowed. */
1148 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1149 if (DECL_NAME (TREE_VALUE (link)) != 0)
1150 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1151 = TREE_VALUE (link);
1153 named_labels = chainon (named_labels, level->names);
1154 shadowed_labels = level->shadowed;
1156 /* Pop the current level, and free the structure for reuse. */
1157 label_level_chain = label_level_chain->level_chain;
1158 level->level_chain = free_binding_level;
1159 free_binding_level = level;
1162 /* Push a definition or a declaration of struct, union or enum tag "name".
1163 "type" should be the type node.
1164 We assume that the tag "name" is not already defined.
1166 Note that the definition may really be just a forward reference.
1167 In that case, the TYPE_SIZE will be zero. */
1170 pushtag (name, type)
1173 register struct binding_level *b;
1175 /* Find the proper binding level for this type tag. */
1177 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1182 /* Record the identifier as the type's name if it has none. */
1184 if (TYPE_NAME (type) == 0)
1185 TYPE_NAME (type) = name;
1188 if (b == global_binding_level)
1189 b->tags = perm_tree_cons (name, type, b->tags);
1191 b->tags = saveable_tree_cons (name, type, b->tags);
1193 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1194 tagged type we just added to the current binding level. This fake
1195 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1196 to output a representation of a tagged type, and it also gives
1197 us a convenient place to record the "scope start" address for the
1200 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1203 /* Handle when a new declaration NEWDECL
1204 has the same name as an old one OLDDECL
1205 in the same binding contour.
1206 Prints an error message if appropriate.
1208 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1209 Otherwise, return 0. */
1212 duplicate_decls (newdecl, olddecl)
1213 register tree newdecl, olddecl;
1215 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1216 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1217 && DECL_INITIAL (newdecl) != 0);
1218 tree oldtype = TREE_TYPE (olddecl);
1219 tree newtype = TREE_TYPE (newdecl);
1221 if (TREE_CODE (newtype) == ERROR_MARK
1222 || TREE_CODE (oldtype) == ERROR_MARK)
1225 /* New decl is completely inconsistent with the old one =>
1226 tell caller to replace the old one.
1227 This is always an error except in the case of shadowing a builtin. */
1228 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1230 if (TREE_CODE (olddecl) == FUNCTION_DECL
1231 && DECL_BUILT_IN (olddecl))
1233 /* If you declare a built-in function name as static, the
1234 built-in definition is overridden,
1235 but optionally warn this was a bad choice of name. */
1236 if (!TREE_PUBLIC (newdecl))
1239 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1241 /* Likewise, if the built-in is not ansi, then programs can
1242 override it even globally without an error. */
1243 else if (DECL_BUILT_IN_NONANSI (olddecl))
1244 warning_with_decl (newdecl,
1245 "built-in function `%s' declared as non-function");
1247 error_with_decl (newdecl,
1248 "built-in function `%s' declared as non-function");
1250 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1251 && DECL_BUILT_IN_NONANSI (olddecl))
1253 /* If overriding decl is static,
1254 optionally warn this was a bad choice of name. */
1255 if (!TREE_PUBLIC (newdecl))
1258 warning_with_decl (newdecl, "shadowing library function `%s'");
1260 /* Otherwise, always warn. */
1262 warning_with_decl (newdecl,
1263 "library function `%s' declared as non-function");
1267 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1268 error_with_decl (olddecl, "previous declaration of `%s'");
1274 /* For real parm decl following a forward decl,
1275 return 1 so old decl will be reused. */
1276 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1277 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1280 /* The new declaration is the same kind of object as the old one.
1281 The declarations may partially match. Print warnings if they don't
1282 match enough. Ultimately, copy most of the information from the new
1283 decl to the old one, and keep using the old one. */
1285 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1286 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1287 && DECL_INITIAL (olddecl) == 0)
1288 /* If -traditional, avoid error for redeclaring fcn
1289 after implicit decl. */
1291 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1292 && DECL_BUILT_IN (olddecl))
1294 /* A function declaration for a built-in function. */
1295 if (!TREE_PUBLIC (newdecl))
1297 /* If you declare a built-in function name as static, the
1298 built-in definition is overridden,
1299 but optionally warn this was a bad choice of name. */
1301 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1302 /* Discard the old built-in function. */
1305 else if (!types_match)
1307 /* Accept the return type of the new declaration if same modes. */
1308 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1309 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1310 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1312 /* Function types may be shared, so we can't just modify
1313 the return type of olddecl's function type. */
1315 = build_function_type (newreturntype,
1316 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1318 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1320 TREE_TYPE (olddecl) = newtype;
1325 /* If types don't match for a built-in, throw away the built-in. */
1326 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1330 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1331 && DECL_SOURCE_LINE (olddecl) == 0)
1333 /* A function declaration for a predeclared function
1334 that isn't actually built in. */
1335 if (!TREE_PUBLIC (newdecl))
1337 /* If you declare it as static, the
1338 default definition is overridden. */
1341 else if (!types_match)
1343 /* If the types don't match, preserve volatility indication.
1344 Later on, we will discard everything else about the
1345 default declaration. */
1346 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1349 /* Permit char *foo () to match void *foo (...) if not pedantic,
1350 if one of them came from a system header file. */
1351 else if (!types_match
1352 && TREE_CODE (olddecl) == FUNCTION_DECL
1353 && TREE_CODE (newdecl) == FUNCTION_DECL
1354 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1355 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1356 && (DECL_IN_SYSTEM_HEADER (olddecl)
1357 || DECL_IN_SYSTEM_HEADER (newdecl))
1358 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1359 && TYPE_ARG_TYPES (oldtype) == 0
1360 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1361 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1363 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1364 && TYPE_ARG_TYPES (newtype) == 0
1365 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1366 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1369 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1370 /* Make sure we keep void * as ret type, not char *. */
1371 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1372 TREE_TYPE (newdecl) = newtype = oldtype;
1374 else if (!types_match
1375 /* Permit char *foo (int, ...); followed by char *foo ();
1377 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1379 /* Return types must still match. */
1380 && comptypes (TREE_TYPE (oldtype),
1381 TREE_TYPE (newtype))
1382 && TYPE_ARG_TYPES (newtype) == 0))
1384 error_with_decl (newdecl, "conflicting types for `%s'");
1385 /* Check for function type mismatch
1386 involving an empty arglist vs a nonempty one. */
1387 if (TREE_CODE (olddecl) == FUNCTION_DECL
1388 && comptypes (TREE_TYPE (oldtype),
1389 TREE_TYPE (newtype))
1390 && ((TYPE_ARG_TYPES (oldtype) == 0
1391 && DECL_INITIAL (olddecl) == 0)
1393 (TYPE_ARG_TYPES (newtype) == 0
1394 && DECL_INITIAL (newdecl) == 0)))
1396 /* Classify the problem further. */
1397 register tree t = TYPE_ARG_TYPES (oldtype);
1399 t = TYPE_ARG_TYPES (newtype);
1400 for (; t; t = TREE_CHAIN (t))
1402 register tree type = TREE_VALUE (t);
1404 if (TREE_CHAIN (t) == 0
1405 && TYPE_MAIN_VARIANT (type) != void_type_node)
1407 error ("A parameter list with an ellipsis can't match");
1408 error ("an empty parameter name list declaration.");
1412 if (TYPE_MAIN_VARIANT (type) == float_type_node
1413 || C_PROMOTING_INTEGER_TYPE_P (type))
1415 error ("An argument type that has a default promotion");
1416 error ("can't match an empty parameter name list declaration.");
1421 error_with_decl (olddecl, "previous declaration of `%s'");
1425 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1428 error_with_decl (newdecl, errmsg);
1429 error_with_decl (olddecl,
1430 ((DECL_INITIAL (olddecl)
1431 && current_binding_level == global_binding_level)
1432 ? "`%s' previously defined here"
1433 : "`%s' previously declared here"));
1435 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1436 && DECL_INITIAL (olddecl) != 0
1437 && TYPE_ARG_TYPES (oldtype) == 0
1438 && TYPE_ARG_TYPES (newtype) != 0)
1440 register tree type, parm;
1442 /* Prototype decl follows defn w/o prototype. */
1444 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1445 type = TYPE_ARG_TYPES (newtype),
1447 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1448 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1449 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1451 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1452 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1454 errmsg = "prototype for `%s' follows and number of arguments";
1457 /* Type for passing arg must be consistent
1458 with that declared for the arg. */
1459 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1460 /* If -traditional, allow `unsigned int' instead of `int'
1461 in the prototype. */
1462 && (! (flag_traditional
1463 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1464 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1466 errmsg = "prototype for `%s' follows and argument %d";
1472 error_with_decl (newdecl, errmsg, nargs);
1473 error_with_decl (olddecl,
1474 "doesn't match non-prototype definition here");
1478 warning_with_decl (newdecl, "prototype for `%s' follows");
1479 warning_with_decl (olddecl, "non-prototype definition here");
1482 /* Warn about mismatches in various flags. */
1485 /* Warn if function is now inline
1486 but was previously declared not inline and has been called. */
1487 if (TREE_CODE (olddecl) == FUNCTION_DECL
1488 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1489 && TREE_USED (olddecl))
1490 warning_with_decl (newdecl,
1491 "`%s' declared inline after being called");
1492 if (TREE_CODE (olddecl) == FUNCTION_DECL
1493 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1494 && DECL_INITIAL (olddecl) != 0)
1495 warning_with_decl (newdecl,
1496 "`%s' declared inline after its definition");
1497 /* It is nice to warn when a function is declared
1498 global first and then static. */
1499 if (TREE_CODE (olddecl) == FUNCTION_DECL
1500 && TREE_PUBLIC (olddecl)
1501 && !TREE_PUBLIC (newdecl))
1502 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1504 /* These bits are logically part of the type, for variables.
1505 But not for functions
1506 (where qualifiers are not valid ANSI anyway). */
1507 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1508 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1509 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1510 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1514 /* Optionally warn about more than one declaration for the same name. */
1515 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1516 /* Dont warn about a function declaration
1517 followed by a definition. */
1518 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1519 && DECL_INITIAL (olddecl) == 0))
1521 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1522 warning_with_decl (olddecl, "previous declaration of `%s'");
1525 /* Copy all the DECL_... slots specified in the new decl
1526 except for any that we copy here from the old type.
1528 Past this point, we don't change OLDTYPE and NEWTYPE
1529 even if we change the types of NEWDECL and OLDDECL. */
1533 /* Merge the data types specified in the two decls. */
1534 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1536 = TREE_TYPE (olddecl)
1537 = common_type (newtype, oldtype);
1539 /* Lay the type out, unless already done. */
1540 if (oldtype != TREE_TYPE (newdecl))
1542 if (TREE_TYPE (newdecl) != error_mark_node)
1543 layout_type (TREE_TYPE (newdecl));
1544 if (TREE_CODE (newdecl) != FUNCTION_DECL
1545 && TREE_CODE (newdecl) != TYPE_DECL
1546 && TREE_CODE (newdecl) != CONST_DECL)
1547 layout_decl (newdecl, 0);
1551 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1552 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1553 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1554 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1555 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1558 /* Keep the old rtl since we can safely use it. */
1559 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1561 /* Merge the type qualifiers. */
1562 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1563 && !TREE_THIS_VOLATILE (newdecl))
1564 TREE_THIS_VOLATILE (olddecl) = 0;
1565 if (TREE_READONLY (newdecl))
1566 TREE_READONLY (olddecl) = 1;
1567 if (TREE_THIS_VOLATILE (newdecl))
1569 TREE_THIS_VOLATILE (olddecl) = 1;
1570 if (TREE_CODE (newdecl) == VAR_DECL)
1571 make_var_volatile (newdecl);
1574 /* Keep source location of definition rather than declaration. */
1575 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1577 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1578 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1581 /* Merge the unused-warning information. */
1582 if (DECL_IN_SYSTEM_HEADER (olddecl))
1583 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1584 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1585 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1587 /* Merge the initialization information. */
1588 if (DECL_INITIAL (newdecl) == 0)
1589 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1591 /* If cannot merge, then use the new type and qualifiers,
1592 and don't preserve the old rtl. */
1595 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1596 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1597 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1598 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1601 /* Merge the storage class information. */
1602 /* For functions, static overrides non-static. */
1603 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1605 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1606 /* This is since we don't automatically
1607 copy the attributes of NEWDECL into OLDDECL. */
1608 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1609 /* If this clears `static', clear it in the identifier too. */
1610 if (! TREE_PUBLIC (olddecl))
1611 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1613 if (DECL_EXTERNAL (newdecl))
1615 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1616 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1617 /* An extern decl does not override previous storage class. */
1618 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1622 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1623 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1626 /* If either decl says `inline', this fn is inline,
1627 unless its definition was passed already. */
1628 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1629 DECL_INLINE (olddecl) = 1;
1630 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1632 /* Get rid of any built-in function if new arg types don't match it
1633 or if we have a function definition. */
1634 if (TREE_CODE (newdecl) == FUNCTION_DECL
1635 && DECL_BUILT_IN (olddecl)
1636 && (!types_match || new_is_definition))
1638 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1639 DECL_BUILT_IN (olddecl) = 0;
1642 /* If redeclaring a builtin function, and not a definition,
1644 Also preserve various other info from the definition. */
1645 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1647 if (DECL_BUILT_IN (olddecl))
1649 DECL_BUILT_IN (newdecl) = 1;
1650 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1653 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1655 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1656 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1657 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1658 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1661 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1662 But preserve OLDdECL's DECL_UID. */
1664 register unsigned olddecl_uid = DECL_UID (olddecl);
1666 bcopy ((char *) newdecl + sizeof (struct tree_common),
1667 (char *) olddecl + sizeof (struct tree_common),
1668 sizeof (struct tree_decl) - sizeof (struct tree_common));
1669 DECL_UID (olddecl) = olddecl_uid;
1675 /* Record a decl-node X as belonging to the current lexical scope.
1676 Check for errors (such as an incompatible declaration for the same
1677 name already seen in the same scope).
1679 Returns either X or an old decl for the same name.
1680 If an old decl is returned, it may have been smashed
1681 to agree with what X says. */
1688 register tree name = DECL_NAME (x);
1689 register struct binding_level *b = current_binding_level;
1691 DECL_CONTEXT (x) = current_function_decl;
1692 /* A local declaration for a function doesn't constitute nesting. */
1693 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0)
1694 DECL_CONTEXT (x) = 0;
1696 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1697 && x != IDENTIFIER_IMPLICIT_DECL (name))
1698 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1705 t = lookup_name_current_level (name);
1706 if (t != 0 && t == error_mark_node)
1707 /* error_mark_node is 0 for a while during initialization! */
1710 error_with_decl (x, "`%s' used prior to declaration");
1715 file = DECL_SOURCE_FILE (t);
1716 line = DECL_SOURCE_LINE (t);
1719 if (t != 0 && duplicate_decls (x, t))
1721 if (TREE_CODE (t) == PARM_DECL)
1723 /* Don't allow more than one "real" duplicate
1724 of a forward parm decl. */
1725 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1728 /* If this decl is `static' and an implicit decl was seen previously,
1729 warn. But don't complain if -traditional,
1730 since traditional compilers don't complain. */
1731 if (!flag_traditional && TREE_PUBLIC (name)
1732 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1733 /* We used to warn also for explicit extern followed by static,
1734 but sometimes you need to do it that way. */
1735 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1737 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1738 IDENTIFIER_POINTER (name));
1739 pedwarn_with_file_and_line (file, line,
1740 "previous declaration of `%s'",
1741 IDENTIFIER_POINTER (name));
1747 /* If we are processing a typedef statement, generate a whole new
1748 ..._TYPE node (which will be just an variant of the existing
1749 ..._TYPE node with identical properties) and then install the
1750 TYPE_DECL node generated to represent the typedef name as the
1751 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1753 The whole point here is to end up with a situation where each
1754 and every ..._TYPE node the compiler creates will be uniquely
1755 associated with AT MOST one node representing a typedef name.
1756 This way, even though the compiler substitutes corresponding
1757 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1758 early on, later parts of the compiler can always do the reverse
1759 translation and get back the corresponding typedef name. For
1762 typedef struct S MY_TYPE;
1765 Later parts of the compiler might only know that `object' was of
1766 type `struct S' if if were not for code just below. With this
1767 code however, later parts of the compiler see something like:
1769 struct S' == struct S
1770 typedef struct S' MY_TYPE;
1773 And they can then deduce (from the node for type struct S') that
1774 the original object declaration was:
1778 Being able to do this is important for proper support of protoize,
1779 and also for generating precise symbolic debugging information
1780 which takes full account of the programmer's (typedef) vocabulary.
1782 Obviously, we don't want to generate a duplicate ..._TYPE node if
1783 the TYPE_DECL node that we are now processing really represents a
1784 standard built-in type.
1786 Since all standard types are effectively declared at line zero
1787 in the source file, we can easily check to see if we are working
1788 on a standard type by checking the current value of lineno. */
1790 if (TREE_CODE (x) == TYPE_DECL)
1792 if (DECL_SOURCE_LINE (x) == 0)
1794 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1795 TYPE_NAME (TREE_TYPE (x)) = x;
1799 tree tt = TREE_TYPE (x);
1801 tt = build_type_copy (tt);
1807 /* Multiple external decls of the same identifier ought to match.
1808 Check against both global declarations and out of scope (limbo) block
1811 We get warnings about inline functions where they are defined.
1812 Avoid duplicate warnings where they are used. */
1813 if ((DECL_EXTERNAL (x) || TREE_PUBLIC (x)) && ! DECL_INLINE (x))
1817 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1818 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1819 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1820 decl = IDENTIFIER_GLOBAL_VALUE (name);
1821 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1822 /* Decls in limbo are always extern, so no need to check that. */
1823 decl = IDENTIFIER_LIMBO_VALUE (name);
1827 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1828 /* If old decl is built-in, we already warned if we should. */
1829 && !DECL_BUILT_IN (decl))
1831 pedwarn_with_decl (x,
1832 "type mismatch with previous external decl");
1833 pedwarn_with_decl (decl, "previous external decl of `%s'");
1837 /* If a function has had an implicit declaration, and then is defined,
1838 make sure they are compatible. */
1840 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1841 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1842 && TREE_CODE (x) == FUNCTION_DECL
1843 && ! comptypes (TREE_TYPE (x),
1844 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1846 warning_with_decl (x, "type mismatch with previous implicit declaration");
1847 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1848 "previous implicit declaration of `%s'");
1851 /* In PCC-compatibility mode, extern decls of vars with no current decl
1852 take effect at top level no matter where they are. */
1853 if (flag_traditional && DECL_EXTERNAL (x)
1854 && lookup_name (name) == 0)
1856 tree type = TREE_TYPE (x);
1858 /* But don't do this if the type contains temporary nodes. */
1861 if (type == error_mark_node)
1863 if (! TREE_PERMANENT (type))
1865 warning_with_decl (x, "type of external `%s' is not global");
1866 /* By exiting the loop early, we leave TYPE nonzero,
1867 and thus prevent globalization of the decl. */
1870 else if (TREE_CODE (type) == FUNCTION_TYPE
1871 && TYPE_ARG_TYPES (type) != 0)
1872 /* The types might not be truly local,
1873 but the list of arg types certainly is temporary.
1874 Since prototypes are nontraditional,
1875 ok not to do the traditional thing. */
1877 type = TREE_TYPE (type);
1881 b = global_binding_level;
1884 /* This name is new in its binding level.
1885 Install the new declaration and return it. */
1886 if (b == global_binding_level)
1888 /* Install a global value. */
1890 /* If the first global decl has external linkage,
1891 warn if we later see static one. */
1892 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1893 TREE_PUBLIC (name) = 1;
1895 IDENTIFIER_GLOBAL_VALUE (name) = x;
1897 /* We no longer care about any previous block level declarations. */
1898 IDENTIFIER_LIMBO_VALUE (name) = 0;
1900 /* Don't forget if the function was used via an implicit decl. */
1901 if (IDENTIFIER_IMPLICIT_DECL (name)
1902 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1903 TREE_USED (x) = 1, TREE_USED (name) = 1;
1905 /* Don't forget if its address was taken in that way. */
1906 if (IDENTIFIER_IMPLICIT_DECL (name)
1907 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1908 TREE_ADDRESSABLE (x) = 1;
1910 /* Warn about mismatches against previous implicit decl. */
1911 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1912 /* If this real decl matches the implicit, don't complain. */
1913 && ! (TREE_CODE (x) == FUNCTION_DECL
1914 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1915 == integer_type_node)))
1916 pedwarn ("`%s' was previously implicitly declared to return `int'",
1917 IDENTIFIER_POINTER (name));
1919 /* If this decl is `static' and an `extern' was seen previously,
1920 that is erroneous. */
1921 if (TREE_PUBLIC (name)
1922 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1924 /* Okay to redeclare an ANSI built-in as static. */
1925 if (t != 0 && DECL_BUILT_IN (t))
1927 /* Okay to declare a non-ANSI built-in as anything. */
1928 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1930 else if (IDENTIFIER_IMPLICIT_DECL (name))
1931 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1932 IDENTIFIER_POINTER (name));
1934 pedwarn ("`%s' was declared `extern' and later `static'",
1935 IDENTIFIER_POINTER (name));
1940 /* Here to install a non-global value. */
1941 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
1942 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
1943 IDENTIFIER_LOCAL_VALUE (name) = x;
1945 /* If this is an extern function declaration, see if we
1946 have a global definition or declaration for the function. */
1948 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
1950 && TREE_CODE (x) == FUNCTION_DECL
1951 && TREE_CODE (oldglobal) == FUNCTION_DECL)
1953 /* We have one. Their types must agree. */
1954 if (! comptypes (TREE_TYPE (x),
1955 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
1956 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
1959 /* Inner extern decl is inline if global one is.
1960 Copy enough to really inline it. */
1961 if (DECL_INLINE (oldglobal))
1963 DECL_INLINE (x) = DECL_INLINE (oldglobal);
1964 DECL_INITIAL (x) = (current_function_decl == oldglobal
1965 ? 0 : DECL_INITIAL (oldglobal));
1966 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
1967 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
1968 DECL_RESULT (x) = DECL_RESULT (oldglobal);
1969 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
1970 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
1972 /* Inner extern decl is built-in if global one is. */
1973 if (DECL_BUILT_IN (oldglobal))
1975 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
1976 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
1978 /* Keep the arg types from a file-scope fcn defn. */
1979 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
1980 && DECL_INITIAL (oldglobal)
1981 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
1982 TREE_TYPE (x) = TREE_TYPE (oldglobal);
1986 #if 0 /* This case is probably sometimes the right thing to do. */
1987 /* If we have a local external declaration,
1988 then any file-scope declaration should not
1989 have been static. */
1990 if (oldlocal == 0 && oldglobal != 0
1991 && !TREE_PUBLIC (oldglobal)
1992 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1993 warning ("`%s' locally external but globally static",
1994 IDENTIFIER_POINTER (name));
1997 /* If we have a local external declaration,
1998 and no file-scope declaration has yet been seen,
1999 then if we later have a file-scope decl it must not be static. */
2002 && DECL_EXTERNAL (x)
2005 TREE_PUBLIC (name) = 1;
2007 /* Save this decl, so that we can do type checking against
2008 other decls after it falls out of scope.
2010 Only save it once. This prevents temporary decls created in
2011 expand_inline_function from being used here, since this
2012 will have been set when the inline function was parsed.
2013 It also helps give slightly better warnings. */
2014 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2015 IDENTIFIER_LIMBO_VALUE (name) = x;
2018 /* Warn if shadowing an argument at the top level of the body. */
2019 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2020 /* This warning doesn't apply to the parms of a nested fcn. */
2021 && ! current_binding_level->parm_flag
2022 /* Check that this is one level down from the parms. */
2023 && current_binding_level->level_chain->parm_flag
2024 /* Check that the decl being shadowed
2025 comes from the parm level, one level up. */
2026 && chain_member (oldlocal, current_binding_level->level_chain->names))
2028 if (TREE_CODE (oldlocal) == PARM_DECL)
2029 pedwarn ("declaration of `%s' shadows a parameter",
2030 IDENTIFIER_POINTER (name));
2032 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2033 IDENTIFIER_POINTER (name));
2036 /* Maybe warn if shadowing something else. */
2037 else if (warn_shadow && !DECL_EXTERNAL (x)
2038 /* No shadow warnings for internally generated vars. */
2039 && DECL_SOURCE_LINE (x) != 0
2040 /* No shadow warnings for vars made for inlining. */
2041 && ! DECL_FROM_INLINE (x))
2043 char *warnstring = 0;
2045 if (TREE_CODE (x) == PARM_DECL
2046 && current_binding_level->parm_flag == 1)
2047 /* Don't warn about the parm names in a declaration. */
2049 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2050 warnstring = "declaration of `%s' shadows a parameter";
2051 else if (oldlocal != 0)
2052 warnstring = "declaration of `%s' shadows previous local";
2053 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2054 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2055 warnstring = "declaration of `%s' shadows global declaration";
2058 warning (warnstring, IDENTIFIER_POINTER (name));
2061 /* If storing a local value, there may already be one (inherited).
2062 If so, record it for restoration when this binding level ends. */
2064 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2067 /* Keep count of variables in this level with incomplete type. */
2068 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2072 /* Put decls on list in reverse order.
2073 We will reverse them later if necessary. */
2074 TREE_CHAIN (x) = b->names;
2080 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2083 pushdecl_top_level (x)
2087 register struct binding_level *b = current_binding_level;
2089 current_binding_level = global_binding_level;
2091 current_binding_level = b;
2095 /* Generate an implicit declaration for identifier FUNCTIONID
2096 as a function of type int (). Print a warning if appropriate. */
2099 implicitly_declare (functionid)
2103 int traditional_warning = 0;
2104 /* Only one "implicit declaration" warning per identifier. */
2105 int implicit_warning;
2107 /* Save the decl permanently so we can warn if definition follows. */
2108 push_obstacks_nochange ();
2109 end_temporary_allocation ();
2111 /* We used to reuse an old implicit decl here,
2112 but this loses with inline functions because it can clobber
2113 the saved decl chains. */
2114 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2115 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2117 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2119 /* Warn of implicit decl following explicit local extern decl.
2120 This is probably a program designed for traditional C. */
2121 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2122 traditional_warning = 1;
2124 /* Warn once of an implicit declaration. */
2125 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2127 DECL_EXTERNAL (decl) = 1;
2128 TREE_PUBLIC (decl) = 1;
2130 /* Record that we have an implicit decl and this is it. */
2131 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2133 /* ANSI standard says implicit declarations are in the innermost block.
2134 So we record the decl in the standard fashion.
2135 If flag_traditional is set, pushdecl does it top-level. */
2138 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2139 maybe_objc_check_decl (decl);
2141 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2143 if (warn_implicit && implicit_warning)
2144 warning ("implicit declaration of function `%s'",
2145 IDENTIFIER_POINTER (functionid));
2146 else if (warn_traditional && traditional_warning)
2147 warning ("function `%s' was previously declared within a block",
2148 IDENTIFIER_POINTER (functionid));
2150 /* Write a record describing this implicit function declaration to the
2151 prototypes file (if requested). */
2153 gen_aux_info_record (decl, 0, 1, 0);
2160 /* Return zero if the declaration NEWDECL is valid
2161 when the declaration OLDDECL (assumed to be for the same name)
2162 has already been seen.
2163 Otherwise return an error message format string with a %s
2164 where the identifier should go. */
2167 redeclaration_error_message (newdecl, olddecl)
2168 tree newdecl, olddecl;
2170 if (TREE_CODE (newdecl) == TYPE_DECL)
2172 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2174 return "redefinition of `%s'";
2176 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2178 /* Declarations of functions can insist on internal linkage
2179 but they can't be inconsistent with internal linkage,
2180 so there can be no error on that account.
2181 However defining the same name twice is no good. */
2182 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2183 /* However, defining once as extern inline and a second
2184 time in another way is ok. */
2185 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2186 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2187 return "redefinition of `%s'";
2190 else if (current_binding_level == global_binding_level)
2192 /* Objects declared at top level: */
2193 /* If at least one is a reference, it's ok. */
2194 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2196 /* Reject two definitions. */
2197 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2198 return "redefinition of `%s'";
2199 /* Now we have two tentative defs, or one tentative and one real def. */
2200 /* Insist that the linkage match. */
2201 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2202 return "conflicting declarations of `%s'";
2205 else if (current_binding_level->parm_flag
2206 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2210 /* Objects declared with block scope: */
2211 /* Reject two definitions, and reject a definition
2212 together with an external reference. */
2213 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2214 return "redeclaration of `%s'";
2219 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2220 Create one if none exists so far for the current function.
2221 This function is called for both label definitions and label references. */
2227 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2229 if (current_function_decl == 0)
2231 error ("label %s referenced outside of any function",
2232 IDENTIFIER_POINTER (id));
2236 /* Use a label already defined or ref'd with this name. */
2239 /* But not if it is inherited and wasn't declared to be inheritable. */
2240 if (DECL_CONTEXT (decl) != current_function_decl
2241 && ! C_DECLARED_LABEL_FLAG (decl))
2242 return shadow_label (id);
2246 decl = build_decl (LABEL_DECL, id, void_type_node);
2248 /* Make sure every label has an rtx. */
2251 /* A label not explicitly declared must be local to where it's ref'd. */
2252 DECL_CONTEXT (decl) = current_function_decl;
2254 DECL_MODE (decl) = VOIDmode;
2256 /* Say where one reference is to the label,
2257 for the sake of the error if it is not defined. */
2258 DECL_SOURCE_LINE (decl) = lineno;
2259 DECL_SOURCE_FILE (decl) = input_filename;
2261 IDENTIFIER_LABEL_VALUE (id) = decl;
2263 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2268 /* Make a label named NAME in the current function,
2269 shadowing silently any that may be inherited from containing functions
2270 or containing scopes.
2272 Note that valid use, if the label being shadowed
2273 comes from another scope in the same function,
2274 requires calling declare_nonlocal_label right away. */
2280 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2284 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2285 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2288 return lookup_label (name);
2291 /* Define a label, specifying the location in the source file.
2292 Return the LABEL_DECL node for the label, if the definition is valid.
2293 Otherwise return 0. */
2296 define_label (filename, line, name)
2301 tree decl = lookup_label (name);
2303 /* If label with this name is known from an outer context, shadow it. */
2304 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2306 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2307 IDENTIFIER_LABEL_VALUE (name) = 0;
2308 decl = lookup_label (name);
2311 if (DECL_INITIAL (decl) != 0)
2313 error_with_decl (decl, "duplicate label `%s'");
2318 /* Mark label as having been defined. */
2319 DECL_INITIAL (decl) = error_mark_node;
2320 /* Say where in the source. */
2321 DECL_SOURCE_FILE (decl) = filename;
2322 DECL_SOURCE_LINE (decl) = line;
2327 /* Return the list of declarations of the current level.
2328 Note that this list is in reverse order unless/until
2329 you nreverse it; and when you do nreverse it, you must
2330 store the result back using `storedecls' or you will lose. */
2335 return current_binding_level->names;
2338 /* Return the list of type-tags (for structs, etc) of the current level. */
2343 return current_binding_level->tags;
2346 /* Store the list of declarations of the current level.
2347 This is done for the parameter declarations of a function being defined,
2348 after they are modified in the light of any missing parameters. */
2354 current_binding_level->names = decls;
2357 /* Similarly, store the list of tags of the current level. */
2363 current_binding_level->tags = tags;
2366 /* Given NAME, an IDENTIFIER_NODE,
2367 return the structure (or union or enum) definition for that name.
2368 Searches binding levels from BINDING_LEVEL up to the global level.
2369 If THISLEVEL_ONLY is nonzero, searches only the specified context
2370 (but skips any tag-transparent contexts to find one that is
2371 meaningful for tags).
2372 CODE says which kind of type the caller wants;
2373 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2374 If the wrong kind of type is found, an error is reported. */
2377 lookup_tag (code, name, binding_level, thislevel_only)
2378 enum tree_code code;
2379 struct binding_level *binding_level;
2383 register struct binding_level *level;
2385 for (level = binding_level; level; level = level->level_chain)
2388 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2390 if (TREE_PURPOSE (tail) == name)
2392 if (TREE_CODE (TREE_VALUE (tail)) != code)
2394 /* Definition isn't the kind we were looking for. */
2395 pending_invalid_xref = name;
2396 pending_invalid_xref_file = input_filename;
2397 pending_invalid_xref_line = lineno;
2399 return TREE_VALUE (tail);
2402 if (thislevel_only && ! level->tag_transparent)
2408 /* Print an error message now
2409 for a recent invalid struct, union or enum cross reference.
2410 We don't print them immediately because they are not invalid
2411 when used in the `struct foo;' construct for shadowing. */
2414 pending_xref_error ()
2416 if (pending_invalid_xref != 0)
2417 error_with_file_and_line (pending_invalid_xref_file,
2418 pending_invalid_xref_line,
2419 "`%s' defined as wrong kind of tag",
2420 IDENTIFIER_POINTER (pending_invalid_xref));
2421 pending_invalid_xref = 0;
2424 /* Given a type, find the tag that was defined for it and return the tag name.
2425 Otherwise return 0. */
2428 lookup_tag_reverse (type)
2431 register struct binding_level *level;
2433 for (level = current_binding_level; level; level = level->level_chain)
2436 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2438 if (TREE_VALUE (tail) == type)
2439 return TREE_PURPOSE (tail);
2445 /* Look up NAME in the current binding level and its superiors
2446 in the namespace of variables, functions and typedefs.
2447 Return a ..._DECL node of some kind representing its definition,
2448 or return 0 if it is undefined. */
2455 if (current_binding_level != global_binding_level
2456 && IDENTIFIER_LOCAL_VALUE (name))
2457 val = IDENTIFIER_LOCAL_VALUE (name);
2459 val = IDENTIFIER_GLOBAL_VALUE (name);
2463 /* Similar to `lookup_name' but look only at current binding level. */
2466 lookup_name_current_level (name)
2471 if (current_binding_level == global_binding_level)
2472 return IDENTIFIER_GLOBAL_VALUE (name);
2474 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2477 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2478 if (DECL_NAME (t) == name)
2484 /* Create the predefined scalar types of C,
2485 and some nodes representing standard constants (0, 1, (void *)0).
2486 Initialize the global binding level.
2487 Make definitions for built-in primitive functions. */
2490 init_decl_processing ()
2492 register tree endlink;
2493 /* Either char* or void*. */
2494 tree traditional_ptr_type_node;
2495 /* Data types of memcpy and strlen. */
2496 tree memcpy_ftype, strlen_ftype;
2497 tree void_ftype_any;
2498 int wchar_type_size;
2501 current_function_decl = NULL;
2502 named_labels = NULL;
2503 current_binding_level = NULL_BINDING_LEVEL;
2504 free_binding_level = NULL_BINDING_LEVEL;
2505 pushlevel (0); /* make the binding_level structure for global names */
2506 global_binding_level = current_binding_level;
2508 /* Define `int' and `char' first so that dbx will output them first. */
2510 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2511 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2512 integer_type_node));
2514 /* Define `char', which is like either `signed char' or `unsigned char'
2515 but not the same as either. */
2519 ? make_signed_type (CHAR_TYPE_SIZE)
2520 : make_unsigned_type (CHAR_TYPE_SIZE));
2521 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2524 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2525 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2526 long_integer_type_node));
2528 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2529 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2530 unsigned_type_node));
2532 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2533 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2534 long_unsigned_type_node));
2536 /* `unsigned long' is the standard type for sizeof.
2537 Traditionally, use a signed type.
2538 Note that stddef.h uses `unsigned long',
2539 and this must agree, even of long and int are the same size. */
2540 if (flag_traditional)
2541 sizetype = long_integer_type_node;
2544 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2547 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2549 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2550 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2551 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2552 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2553 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2555 error_mark_node = make_node (ERROR_MARK);
2556 TREE_TYPE (error_mark_node) = error_mark_node;
2558 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2559 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2560 short_integer_type_node));
2562 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2563 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2564 long_long_integer_type_node));
2566 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2567 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2568 short_unsigned_type_node));
2570 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2571 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2572 long_long_unsigned_type_node));
2574 /* Define both `signed char' and `unsigned char'. */
2575 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2576 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2577 signed_char_type_node));
2579 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2580 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2581 unsigned_char_type_node));
2583 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2584 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2586 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2587 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2589 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2590 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2592 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2593 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2595 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2596 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2598 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2599 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2601 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2602 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2604 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2605 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2607 float_type_node = make_node (REAL_TYPE);
2608 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2609 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2611 layout_type (float_type_node);
2613 double_type_node = make_node (REAL_TYPE);
2614 if (flag_short_double)
2615 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2617 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2618 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2620 layout_type (double_type_node);
2622 long_double_type_node = make_node (REAL_TYPE);
2623 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2624 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2625 long_double_type_node));
2626 layout_type (long_double_type_node);
2629 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2630 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2631 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2632 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2634 integer_zero_node = build_int_2 (0, 0);
2635 TREE_TYPE (integer_zero_node) = integer_type_node;
2636 integer_one_node = build_int_2 (1, 0);
2637 TREE_TYPE (integer_one_node) = integer_type_node;
2639 size_zero_node = build_int_2 (0, 0);
2640 TREE_TYPE (size_zero_node) = sizetype;
2641 size_one_node = build_int_2 (1, 0);
2642 TREE_TYPE (size_one_node) = sizetype;
2644 void_type_node = make_node (VOID_TYPE);
2645 pushdecl (build_decl (TYPE_DECL,
2646 ridpointers[(int) RID_VOID], void_type_node));
2647 layout_type (void_type_node); /* Uses integer_zero_node */
2648 /* We are not going to have real types in C with less than byte alignment,
2649 so we might as well not have any types that claim to have it. */
2650 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2652 null_pointer_node = build_int_2 (0, 0);
2653 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2654 layout_type (TREE_TYPE (null_pointer_node));
2656 string_type_node = build_pointer_type (char_type_node);
2657 const_string_type_node
2658 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2660 /* make a type for arrays of 256 characters.
2661 256 is picked randomly because we have a type for integers from 0 to 255.
2662 With luck nothing will ever really depend on the length of this
2664 char_array_type_node
2665 = build_array_type (char_type_node, unsigned_intQI_type_node);
2666 /* Likewise for arrays of ints. */
2668 = build_array_type (integer_type_node, unsigned_intQI_type_node);
2669 /* This is for wide string constants. */
2670 wchar_array_type_node
2671 = build_array_type (wchar_type_node, unsigned_intQI_type_node);
2673 default_function_type
2674 = build_function_type (integer_type_node, NULL_TREE);
2676 ptr_type_node = build_pointer_type (void_type_node);
2678 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2680 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2683 = build_function_type (void_type_node, NULL_TREE);
2686 = build_function_type (double_type_node,
2687 tree_cons (NULL_TREE, double_type_node, endlink));
2689 double_ftype_double_double
2690 = build_function_type (double_type_node,
2691 tree_cons (NULL_TREE, double_type_node,
2692 tree_cons (NULL_TREE,
2693 double_type_node, endlink)));
2696 = build_function_type (integer_type_node,
2697 tree_cons (NULL_TREE, integer_type_node, endlink));
2700 = build_function_type (long_integer_type_node,
2701 tree_cons (NULL_TREE,
2702 long_integer_type_node, endlink));
2704 void_ftype_ptr_ptr_int
2705 = build_function_type (void_type_node,
2706 tree_cons (NULL_TREE, ptr_type_node,
2707 tree_cons (NULL_TREE, ptr_type_node,
2708 tree_cons (NULL_TREE,
2712 int_ftype_cptr_cptr_sizet
2713 = build_function_type (integer_type_node,
2714 tree_cons (NULL_TREE, const_ptr_type_node,
2715 tree_cons (NULL_TREE, const_ptr_type_node,
2716 tree_cons (NULL_TREE,
2720 void_ftype_ptr_int_int
2721 = build_function_type (void_type_node,
2722 tree_cons (NULL_TREE, ptr_type_node,
2723 tree_cons (NULL_TREE, integer_type_node,
2724 tree_cons (NULL_TREE,
2728 string_ftype_ptr_ptr /* strcpy prototype */
2729 = build_function_type (string_type_node,
2730 tree_cons (NULL_TREE, string_type_node,
2731 tree_cons (NULL_TREE,
2732 const_string_type_node,
2735 int_ftype_string_string /* strcmp prototype */
2736 = build_function_type (integer_type_node,
2737 tree_cons (NULL_TREE, const_string_type_node,
2738 tree_cons (NULL_TREE,
2739 const_string_type_node,
2742 strlen_ftype /* strlen prototype */
2743 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2744 tree_cons (NULL_TREE, const_string_type_node,
2747 traditional_ptr_type_node
2748 = (flag_traditional ? string_type_node : ptr_type_node);
2750 memcpy_ftype /* memcpy prototype */
2751 = build_function_type (traditional_ptr_type_node,
2752 tree_cons (NULL_TREE, ptr_type_node,
2753 tree_cons (NULL_TREE, const_ptr_type_node,
2754 tree_cons (NULL_TREE,
2758 builtin_function ("__builtin_constant_p", int_ftype_int,
2759 BUILT_IN_CONSTANT_P, NULL_PTR);
2761 builtin_function ("__builtin_return_address",
2762 build_function_type (ptr_type_node,
2763 tree_cons (NULL_TREE,
2766 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2768 builtin_function ("__builtin_frame_address",
2769 build_function_type (ptr_type_node,
2770 tree_cons (NULL_TREE,
2773 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2775 builtin_function ("__builtin_alloca",
2776 build_function_type (ptr_type_node,
2777 tree_cons (NULL_TREE,
2780 BUILT_IN_ALLOCA, "alloca");
2781 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2782 /* Define alloca, ffs as builtins.
2783 Declare _exit just to mark it as volatile. */
2784 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2786 temp = builtin_function ("alloca",
2787 build_function_type (ptr_type_node,
2788 tree_cons (NULL_TREE,
2791 BUILT_IN_ALLOCA, NULL_PTR);
2792 /* Suppress error if redefined as a non-function. */
2793 DECL_BUILT_IN_NONANSI (temp) = 1;
2794 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2795 /* Suppress error if redefined as a non-function. */
2796 DECL_BUILT_IN_NONANSI (temp) = 1;
2797 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2799 TREE_THIS_VOLATILE (temp) = 1;
2800 TREE_SIDE_EFFECTS (temp) = 1;
2801 /* Suppress error if redefined as a non-function. */
2802 DECL_BUILT_IN_NONANSI (temp) = 1;
2805 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2806 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2808 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2810 builtin_function ("__builtin_saveregs",
2811 build_function_type (ptr_type_node, NULL_TREE),
2812 BUILT_IN_SAVEREGS, NULL_PTR);
2813 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2815 builtin_function ("__builtin_varargs",
2816 build_function_type (ptr_type_node,
2817 tree_cons (NULL_TREE,
2820 BUILT_IN_VARARGS, NULL_PTR);
2822 builtin_function ("__builtin_classify_type", default_function_type,
2823 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2824 builtin_function ("__builtin_next_arg",
2825 build_function_type (ptr_type_node, endlink),
2826 BUILT_IN_NEXT_ARG, NULL_PTR);
2827 builtin_function ("__builtin_args_info",
2828 build_function_type (integer_type_node,
2829 tree_cons (NULL_TREE,
2832 BUILT_IN_ARGS_INFO, NULL_PTR);
2834 /* Currently under experimentation. */
2835 builtin_function ("__builtin_memcpy", memcpy_ftype,
2836 BUILT_IN_MEMCPY, "memcpy");
2837 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2838 BUILT_IN_MEMCMP, "memcmp");
2839 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2840 BUILT_IN_STRCMP, "strcmp");
2841 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2842 BUILT_IN_STRCPY, "strcpy");
2843 builtin_function ("__builtin_strlen", strlen_ftype,
2844 BUILT_IN_STRLEN, "strlen");
2845 builtin_function ("__builtin_fsqrt", double_ftype_double,
2846 BUILT_IN_FSQRT, "sqrt");
2847 builtin_function ("__builtin_sin", double_ftype_double,
2848 BUILT_IN_SIN, "sin");
2849 builtin_function ("__builtin_cos", double_ftype_double,
2850 BUILT_IN_COS, "cos");
2852 /* In an ANSI C program, it is okay to supply built-in meanings
2853 for these functions, since applications cannot validly use them
2854 with any other meaning.
2855 However, honor the -fno-builtin option. */
2856 if (!flag_no_builtin)
2858 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2859 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
2860 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
2861 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
2862 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
2864 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
2866 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
2868 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
2869 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
2870 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
2871 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
2873 /* Declare these functions volatile
2874 to avoid spurious "control drops through" warnings. */
2875 /* Don't specify the argument types, to avoid errors
2876 from certain code which isn't valid in ANSI but which exists. */
2877 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
2879 TREE_THIS_VOLATILE (temp) = 1;
2880 TREE_SIDE_EFFECTS (temp) = 1;
2881 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
2882 TREE_THIS_VOLATILE (temp) = 1;
2883 TREE_SIDE_EFFECTS (temp) = 1;
2887 /* Support for these has not been written in either expand_builtin
2888 or build_function_call. */
2889 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
2890 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
2891 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
2893 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
2895 builtin_function ("__builtin_fmod", double_ftype_double_double,
2896 BUILT_IN_FMOD, NULL_PTR);
2897 builtin_function ("__builtin_frem", double_ftype_double_double,
2898 BUILT_IN_FREM, NULL_PTR);
2899 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
2900 BUILT_IN_MEMSET, NULL_PTR);
2901 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
2903 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
2907 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
2908 declare_function_name ();
2910 start_identifier_warnings ();
2912 init_format_info_table ();
2915 /* Return a definition for a builtin function named NAME and whose data type
2916 is TYPE. TYPE should be a function type with argument types.
2917 FUNCTION_CODE tells later passes how to compile calls to this function.
2918 See tree.h for its possible values.
2920 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2921 the name to be called if we can't opencode the function. */
2924 builtin_function (name, type, function_code, library_name)
2927 enum built_in_function function_code;
2930 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2931 DECL_EXTERNAL (decl) = 1;
2932 TREE_PUBLIC (decl) = 1;
2933 /* If -traditional, permit redefining a builtin function any way you like.
2934 (Though really, if the program redefines these functions,
2935 it probably won't work right unless compiled with -fno-builtin.) */
2936 if (flag_traditional && name[0] != '_')
2937 DECL_BUILT_IN_NONANSI (decl) = 1;
2939 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
2940 make_decl_rtl (decl, NULL_PTR, 1);
2942 if (function_code != NOT_BUILT_IN)
2944 DECL_BUILT_IN (decl) = 1;
2945 DECL_SET_FUNCTION_CODE (decl, function_code);
2947 /* Warn if a function in the namespace for users
2948 is used without an occasion to consider it declared. */
2949 if (name[0] != '_' || name[1] != '_')
2950 C_DECL_ANTICIPATED (decl) = 1;
2955 /* Called when a declaration is seen that contains no names to declare.
2956 If its type is a reference to a structure, union or enum inherited
2957 from a containing scope, shadow that tag name for the current scope
2958 with a forward reference.
2959 If its type defines a new named structure or union
2960 or defines an enum, it is valid but we need not do anything here.
2961 Otherwise, it is an error. */
2964 shadow_tag (declspecs)
2967 shadow_tag_warned (declspecs, 0);
2971 shadow_tag_warned (declspecs, warned)
2978 pending_invalid_xref = 0;
2980 for (link = declspecs; link; link = TREE_CHAIN (link))
2982 register tree value = TREE_VALUE (link);
2983 register enum tree_code code = TREE_CODE (value);
2985 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2986 /* Used to test also that TYPE_SIZE (value) != 0.
2987 That caused warning for `struct foo;' at top level in the file. */
2989 register tree name = lookup_tag_reverse (value);
2996 if (!warned && code != ENUMERAL_TYPE) /* Empty unnamed enum OK */
2998 pedwarn ("unnamed struct/union that defines no instances");
3004 t = lookup_tag (code, name, current_binding_level, 1);
3008 t = make_node (code);
3016 pedwarn ("useless keyword or type name in empty declaration");
3024 error ("two types specified in one empty declaration");
3026 pedwarn ("empty declaration");
3030 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3033 groktypename (typename)
3036 if (TREE_CODE (typename) != TREE_LIST)
3038 return grokdeclarator (TREE_VALUE (typename),
3039 TREE_PURPOSE (typename),
3043 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3046 groktypename_in_parm_context (typename)
3049 if (TREE_CODE (typename) != TREE_LIST)
3051 return grokdeclarator (TREE_VALUE (typename),
3052 TREE_PURPOSE (typename),
3056 /* Decode a declarator in an ordinary declaration or data definition.
3057 This is called as soon as the type information and variable name
3058 have been parsed, before parsing the initializer if any.
3059 Here we create the ..._DECL node, fill in its type,
3060 and put it on the list of decls for the current context.
3061 The ..._DECL node is returned as the value.
3063 Exception: for arrays where the length is not specified,
3064 the type is left null, to be filled in by `finish_decl'.
3066 Function definitions do not come here; they go to start_function
3067 instead. However, external and forward declarations of functions
3068 do go through here. Structure field declarations are done by
3069 grokfield and not through here. */
3071 /* Set this to zero to debug not using the temporary obstack
3072 to parse initializers. */
3073 int debug_temp_inits = 1;
3076 start_decl (declarator, declspecs, initialized)
3077 tree declarator, declspecs;
3080 register tree decl = grokdeclarator (declarator, declspecs,
3081 NORMAL, initialized);
3083 int init_written = initialized;
3085 /* The corresponding pop_obstacks is in finish_decl. */
3086 push_obstacks_nochange ();
3089 /* Is it valid for this decl to have an initializer at all?
3090 If not, set INITIALIZED to zero, which will indirectly
3091 tell `finish_decl' to ignore the initializer once it is parsed. */
3092 switch (TREE_CODE (decl))
3095 /* typedef foo = bar means give foo the same type as bar.
3096 We haven't parsed bar yet, so `finish_decl' will fix that up.
3097 Any other case of an initialization in a TYPE_DECL is an error. */
3098 if (pedantic || list_length (declspecs) > 1)
3100 error ("typedef `%s' is initialized",
3101 IDENTIFIER_POINTER (DECL_NAME (decl)));
3107 error ("function `%s' is initialized like a variable",
3108 IDENTIFIER_POINTER (DECL_NAME (decl)));
3113 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3114 error ("parameter `%s' is initialized",
3115 IDENTIFIER_POINTER (DECL_NAME (decl)));
3120 /* Don't allow initializations for incomplete types
3121 except for arrays which might be completed by the initialization. */
3122 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3124 /* A complete type is ok if size is fixed. */
3126 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3127 || C_DECL_VARIABLE_SIZE (decl))
3129 error ("variable-sized object may not be initialized");
3133 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3135 error ("variable `%s' has initializer but incomplete type",
3136 IDENTIFIER_POINTER (DECL_NAME (decl)));
3139 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3141 error ("elements of array `%s' have incomplete type",
3142 IDENTIFIER_POINTER (DECL_NAME (decl)));
3149 #if 0 /* Seems redundant with grokdeclarator. */
3150 if (current_binding_level != global_binding_level
3151 && DECL_EXTERNAL (decl)
3152 && TREE_CODE (decl) != FUNCTION_DECL)
3153 warning ("declaration of `%s' has `extern' and is initialized",
3154 IDENTIFIER_POINTER (DECL_NAME (decl)));
3156 DECL_EXTERNAL (decl) = 0;
3157 if (current_binding_level == global_binding_level)
3158 TREE_STATIC (decl) = 1;
3160 /* Tell `pushdecl' this is an initialized decl
3161 even though we don't yet have the initializer expression.
3162 Also tell `finish_decl' it may store the real initializer. */
3163 DECL_INITIAL (decl) = error_mark_node;
3166 /* If this is a function declaration, write a record describing it to the
3167 prototypes file (if requested). */
3169 if (TREE_CODE (decl) == FUNCTION_DECL)
3170 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3172 /* Add this decl to the current binding level.
3173 TEM may equal DECL or it may be a previous decl of the same name. */
3174 tem = pushdecl (decl);
3176 /* For a local variable, define the RTL now. */
3177 if (current_binding_level != global_binding_level
3178 /* But not if this is a duplicate decl
3179 and we preserved the rtl from the previous one
3180 (which may or may not happen). */
3181 && DECL_RTL (tem) == 0)
3183 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3185 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3186 && DECL_INITIAL (tem) != 0)
3192 /* When parsing and digesting the initializer,
3193 use temporary storage. Do this even if we will ignore the value. */
3194 if (current_binding_level == global_binding_level && debug_temp_inits)
3195 temporary_allocation ();
3201 /* Finish processing of a declaration;
3202 install its initial value.
3203 If the length of an array type is not known before,
3204 it must be determined now, from the initial value, or it is an error. */
3207 finish_decl (decl, init, asmspec_tree)
3211 register tree type = TREE_TYPE (decl);
3212 int was_incomplete = (DECL_SIZE (decl) == 0);
3213 int temporary = allocation_temporary_p ();
3217 asmspec = TREE_STRING_POINTER (asmspec_tree);
3219 /* If `start_decl' didn't like having an initialization, ignore it now. */
3221 if (init != 0 && DECL_INITIAL (decl) == 0)
3223 /* Don't crash if parm is initialized. */
3224 if (TREE_CODE (decl) == PARM_DECL)
3229 if (TREE_CODE (decl) != TYPE_DECL)
3230 store_init_value (decl, init);
3233 /* typedef foo = bar; store the type of bar as the type of foo. */
3234 TREE_TYPE (decl) = TREE_TYPE (init);
3235 DECL_INITIAL (decl) = init = 0;
3239 /* Pop back to the obstack that is current for this binding level.
3240 This is because MAXINDEX, rtl, etc. to be made below
3241 must go in the permanent obstack. But don't discard the
3242 temporary data yet. */
3244 #if 0 /* pop_obstacks was near the end; this is what was here. */
3245 if (current_binding_level == global_binding_level && temporary)
3246 end_temporary_allocation ();
3249 /* Deduce size of array from initialization, if not already known */
3251 if (TREE_CODE (type) == ARRAY_TYPE
3252 && TYPE_DOMAIN (type) == 0
3253 && TREE_CODE (decl) != TYPE_DECL)
3256 = (TREE_STATIC (decl)
3257 /* Even if pedantic, an external linkage array
3258 may have incomplete type at first. */
3259 ? pedantic && !TREE_PUBLIC (decl)
3260 : !DECL_EXTERNAL (decl));
3262 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3264 /* Get the completed type made by complete_array_type. */
3265 type = TREE_TYPE (decl);
3268 error_with_decl (decl, "initializer fails to determine size of `%s'");
3273 error_with_decl (decl, "array size missing in `%s'");
3274 else if (!pedantic && TREE_STATIC (decl))
3275 DECL_EXTERNAL (decl) = 1;
3278 if (pedantic && TYPE_DOMAIN (type) != 0
3279 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3281 error_with_decl (decl, "zero-size array `%s'");
3283 layout_decl (decl, 0);
3286 if (TREE_CODE (decl) == VAR_DECL)
3288 if (DECL_SIZE (decl) == 0
3289 && (TREE_STATIC (decl)
3291 /* A static variable with an incomplete type
3292 is an error if it is initialized or `static'.
3293 Otherwise, let it through, but if it is not `extern'
3294 then it may cause an error message later. */
3295 !TREE_PUBLIC (decl) || DECL_INITIAL (decl)
3297 /* An automatic variable with an incomplete type
3299 !DECL_EXTERNAL (decl)))
3301 error_with_decl (decl, "storage size of `%s' isn't known");
3302 TREE_TYPE (decl) = error_mark_node;
3305 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3306 && DECL_SIZE (decl) != 0
3307 && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
3308 error_with_decl (decl, "storage size of `%s' isn't constant");
3311 /* Output the assembler code and/or RTL code for variables and functions,
3312 unless the type is an undefined structure or union.
3313 If not, it will get done when the type is completed. */
3315 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3317 if (flag_traditional && allocation_temporary_p ())
3319 push_obstacks_nochange ();
3320 end_temporary_allocation ();
3321 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3322 maybe_objc_check_decl (decl);
3323 rest_of_decl_compilation (decl, asmspec,
3324 current_binding_level == global_binding_level,
3330 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3331 maybe_objc_check_decl (decl);
3332 rest_of_decl_compilation (decl, asmspec,
3333 current_binding_level == global_binding_level,
3336 if (current_binding_level != global_binding_level)
3338 /* Recompute the RTL of a local array now
3339 if it used to be an incomplete type. */
3341 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3343 /* If we used it already as memory, it must stay in memory. */
3344 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3345 /* If it's still incomplete now, no init will save it. */
3346 if (DECL_SIZE (decl) == 0)
3347 DECL_INITIAL (decl) = 0;
3350 /* Compute and store the initial value. */
3351 if (TREE_CODE (decl) != FUNCTION_DECL)
3352 expand_decl_init (decl);
3356 if (TREE_CODE (decl) == TYPE_DECL)
3358 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3359 maybe_objc_check_decl (decl);
3360 rest_of_decl_compilation (decl, NULL_PTR,
3361 current_binding_level == global_binding_level,
3365 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3366 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3367 && temporary && TREE_PERMANENT (decl))
3369 /* We need to remember that this array HAD an initialization,
3370 but discard the actual temporary nodes,
3371 since we can't have a permanent node keep pointing to them. */
3372 /* We make an exception for inline functions, since it's
3373 normal for a local extern redeclaration of an inline function
3374 to have a copy of the top-level decl's DECL_INLINE. */
3375 if (DECL_INITIAL (decl) != 0)
3376 DECL_INITIAL (decl) = error_mark_node;
3380 /* Resume permanent allocation, if not within a function. */
3381 /* The corresponding push_obstacks_nochange is in start_decl,
3382 and in push_parm_decl and in grokfield. */
3386 /* If we have gone back from temporary to permanent allocation,
3387 actually free the temporary space that we no longer need. */
3388 if (temporary && !allocation_temporary_p ())
3389 permanent_allocation ();
3391 /* At the end of a declaration, throw away any variable type sizes
3392 of types defined inside that declaration. There is no use
3393 computing them in the following function definition. */
3394 if (current_binding_level == global_binding_level)
3395 get_pending_sizes ();
3398 /* If DECL has a cleanup, build and return that cleanup here.
3399 This is a callback called by expand_expr. */
3402 maybe_build_cleanup (decl)
3405 /* There are no cleanups in C. */
3409 /* Given a parsed parameter declaration,
3410 decode it into a PARM_DECL and push that on the current binding level.
3411 Also, for the sake of forward parm decls,
3412 record the given order of parms in `parm_order'. */
3415 push_parm_decl (parm)
3419 int old_immediate_size_expand = immediate_size_expand;
3420 /* Don't try computing parm sizes now -- wait till fn is called. */
3421 immediate_size_expand = 0;
3423 /* The corresponding pop_obstacks is in finish_decl. */
3424 push_obstacks_nochange ();
3426 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3427 if (DECL_NAME (decl))
3429 olddecl = lookup_name (DECL_NAME (decl));
3430 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3431 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3433 decl = pushdecl (decl);
3435 immediate_size_expand = old_immediate_size_expand;
3437 current_binding_level->parm_order
3438 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3440 /* Add this decl to the current binding level. */
3441 finish_decl (decl, NULL_TREE, NULL_TREE);
3444 /* Clear the given order of parms in `parm_order'.
3445 Used at start of parm list,
3446 and also at semicolon terminating forward decls. */
3451 current_binding_level->parm_order = NULL_TREE;
3454 /* Make TYPE a complete type based on INITIAL_VALUE.
3455 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3456 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3459 complete_array_type (type, initial_value, do_default)
3464 register tree maxindex = NULL_TREE;
3469 /* Note MAXINDEX is really the maximum index,
3470 one less than the size. */
3471 if (TREE_CODE (initial_value) == STRING_CST)
3474 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3475 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3477 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3480 = list_length (CONSTRUCTOR_ELTS (initial_value));
3481 maxindex = build_int_2 (nelts - 1, 0);
3485 /* Make an error message unless that happened already. */
3486 if (initial_value != error_mark_node)
3489 /* Prevent further error messages. */
3490 maxindex = build_int_2 (1, 0);
3497 maxindex = build_int_2 (1, 0);
3503 TYPE_DOMAIN (type) = build_index_type (maxindex);
3504 if (!TREE_TYPE (maxindex))
3505 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3508 /* Lay out the type now that we can get the real answer. */
3515 /* Given declspecs and a declarator,
3516 determine the name and type of the object declared
3517 and construct a ..._DECL node for it.
3518 (In one case we can return a ..._TYPE node instead.
3519 For invalid input we sometimes return 0.)
3521 DECLSPECS is a chain of tree_list nodes whose value fields
3522 are the storage classes and type specifiers.
3524 DECL_CONTEXT says which syntactic context this declaration is in:
3525 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3526 FUNCDEF for a function definition. Like NORMAL but a few different
3527 error messages in each case. Return value may be zero meaning
3528 this definition is too screwy to try to parse.
3529 PARM for a parameter declaration (either within a function prototype
3530 or before a function body). Make a PARM_DECL, or return void_type_node.
3531 TYPENAME if for a typename (in a cast or sizeof).
3532 Don't make a DECL node; just return the ..._TYPE node.
3533 FIELD for a struct or union field; make a FIELD_DECL.
3534 BITFIELD for a field with specified width.
3535 INITIALIZED is 1 if the decl has an initializer.
3537 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3538 It may also be so in the PARM case, for a prototype where the
3539 argument type is specified but not the name.
3541 This function is where the complicated C meanings of `static'
3542 and `extern' are interpreted. */
3545 grokdeclarator (declarator, declspecs, decl_context, initialized)
3548 enum decl_context decl_context;
3553 tree type = NULL_TREE;
3558 int explicit_int = 0;
3559 int explicit_char = 0;
3560 tree typedef_decl = 0;
3562 tree typedef_type = 0;
3563 int funcdef_flag = 0;
3564 enum tree_code innermost_code = ERROR_MARK;
3566 int size_varies = 0;
3568 if (decl_context == BITFIELD)
3569 bitfield = 1, decl_context = FIELD;
3571 if (decl_context == FUNCDEF)
3572 funcdef_flag = 1, decl_context = NORMAL;
3574 push_obstacks_nochange ();
3576 if (flag_traditional && allocation_temporary_p ())
3577 end_temporary_allocation ();
3579 /* Look inside a declarator for the name being declared
3580 and get it as a string, for an error message. */
3582 register tree decl = declarator;
3586 switch (TREE_CODE (decl))
3591 innermost_code = TREE_CODE (decl);
3592 decl = TREE_OPERAND (decl, 0);
3595 case IDENTIFIER_NODE:
3596 name = IDENTIFIER_POINTER (decl);
3607 /* A function definition's declarator must have the form of
3608 a function declarator. */
3610 if (funcdef_flag && innermost_code != CALL_EXPR)
3613 /* Anything declared one level down from the top level
3614 must be one of the parameters of a function
3615 (because the body is at least two levels down). */
3617 /* If this looks like a function definition, make it one,
3618 even if it occurs where parms are expected.
3619 Then store_parm_decls will reject it and not use it as a parm. */
3620 if (decl_context == NORMAL && !funcdef_flag
3621 && current_binding_level->level_chain == global_binding_level)
3622 decl_context = PARM;
3624 /* Look through the decl specs and record which ones appear.
3625 Some typespecs are defined as built-in typenames.
3626 Others, the ones that are modifiers of other types,
3627 are represented by bits in SPECBITS: set the bits for
3628 the modifiers that appear. Storage class keywords are also in SPECBITS.
3630 If there is a typedef name or a type, store the type in TYPE.
3631 This includes builtin typedefs such as `int'.
3633 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3634 and did not come from a user typedef.
3636 Set LONGLONG if `long' is mentioned twice. */
3638 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3641 register tree id = TREE_VALUE (spec);
3643 if (id == ridpointers[(int) RID_INT])
3645 if (id == ridpointers[(int) RID_CHAR])
3648 if (TREE_CODE (id) == IDENTIFIER_NODE)
3649 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3651 if (ridpointers[i] == id)
3653 if (i == (int) RID_LONG && specbits & (1<<i))
3656 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3658 error ("`long long long' is too long for GCC");
3662 else if (specbits & (1 << i))
3663 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3669 error ("two or more data types in declaration of `%s'", name);
3670 /* Actual typedefs come to us as TYPE_DECL nodes. */
3671 else if (TREE_CODE (id) == TYPE_DECL)
3673 type = TREE_TYPE (id);
3676 /* Built-in types come as identifiers. */
3677 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3679 register tree t = lookup_name (id);
3680 if (TREE_TYPE (t) == error_mark_node)
3682 else if (!t || TREE_CODE (t) != TYPE_DECL)
3683 error ("`%s' fails to be a typedef or built in type",
3684 IDENTIFIER_POINTER (id));
3687 type = TREE_TYPE (t);
3691 else if (TREE_CODE (id) != ERROR_MARK)
3697 typedef_type = type;
3699 size_varies = C_TYPE_VARIABLE_SIZE (type);
3701 /* No type at all: default to `int', and set EXPLICIT_INT
3702 because it was not a user-defined typedef. */
3706 if (funcdef_flag && warn_return_type
3707 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3708 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3709 warn_about_return_type = 1;
3711 type = integer_type_node;
3714 /* Now process the modifiers that were specified
3715 and check for invalid combinations. */
3717 /* Long double is a special combination. */
3719 if ((specbits & 1 << (int) RID_LONG)
3720 && TYPE_MAIN_VARIANT (type) == double_type_node)
3722 specbits &= ~ (1 << (int) RID_LONG);
3723 type = long_double_type_node;
3726 /* Check all other uses of type modifiers. */
3728 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3729 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3733 if (TREE_CODE (type) != INTEGER_TYPE)
3734 error ("long, short, signed or unsigned invalid for `%s'", name);
3735 else if ((specbits & 1 << (int) RID_LONG)
3736 && (specbits & 1 << (int) RID_SHORT))
3737 error ("long and short specified together for `%s'", name);
3738 else if (((specbits & 1 << (int) RID_LONG)
3739 || (specbits & 1 << (int) RID_SHORT))
3741 error ("long or short specified with char for `%s'", name);
3742 else if (((specbits & 1 << (int) RID_LONG)
3743 || (specbits & 1 << (int) RID_SHORT))
3744 && TREE_CODE (type) == REAL_TYPE)
3745 error ("long or short specified with floating type for `%s'", name);
3746 else if ((specbits & 1 << (int) RID_SIGNED)
3747 && (specbits & 1 << (int) RID_UNSIGNED))
3748 error ("signed and unsigned given together for `%s'", name);
3752 if (!explicit_int && !explicit_char && pedantic)
3754 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3756 if (flag_pedantic_errors)
3761 /* Discard the type modifiers if they are invalid. */
3764 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3765 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3770 /* Decide whether an integer type is signed or not.
3771 Optionally treat bitfields as signed by default. */
3772 if (specbits & 1 << (int) RID_UNSIGNED
3773 /* Traditionally, all bitfields are unsigned. */
3774 || (bitfield && flag_traditional
3775 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3776 || (bitfield && ! flag_signed_bitfields
3777 && (explicit_int || explicit_char
3778 /* A typedef for plain `int' without `signed'
3779 can be controlled just like plain `int'. */
3780 || ! (typedef_decl != 0
3781 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3782 && TREE_CODE (type) != ENUMERAL_TYPE
3783 && !(specbits & 1 << (int) RID_SIGNED)))
3786 type = long_long_unsigned_type_node;
3787 else if (specbits & 1 << (int) RID_LONG)
3788 type = long_unsigned_type_node;
3789 else if (specbits & 1 << (int) RID_SHORT)
3790 type = short_unsigned_type_node;
3791 else if (type == char_type_node)
3792 type = unsigned_char_type_node;
3793 else if (typedef_decl)
3794 type = unsigned_type (type);
3796 type = unsigned_type_node;
3798 else if ((specbits & 1 << (int) RID_SIGNED)
3799 && type == char_type_node)
3800 type = signed_char_type_node;
3802 type = long_long_integer_type_node;
3803 else if (specbits & 1 << (int) RID_LONG)
3804 type = long_integer_type_node;
3805 else if (specbits & 1 << (int) RID_SHORT)
3806 type = short_integer_type_node;
3808 /* Set CONSTP if this declaration is `const', whether by
3809 explicit specification or via a typedef.
3810 Likewise for VOLATILEP. */
3812 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3813 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3814 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3816 pedwarn ("duplicate `const'");
3818 pedwarn ("duplicate `volatile'");
3819 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
3820 type = TYPE_MAIN_VARIANT (type);
3822 /* Warn if two storage classes are given. Default to `auto'. */
3827 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3828 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3829 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3830 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3831 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3833 /* Warn about storage classes that are invalid for certain
3834 kinds of declarations (parameters, typenames, etc.). */
3837 error ("multiple storage classes in declaration of `%s'", name);
3838 else if (funcdef_flag
3840 & ((1 << (int) RID_REGISTER)
3841 | (1 << (int) RID_AUTO)
3842 | (1 << (int) RID_TYPEDEF))))
3844 if (specbits & 1 << (int) RID_AUTO
3845 && (pedantic || current_binding_level == global_binding_level))
3846 pedwarn ("function definition declared `auto'");
3847 if (specbits & 1 << (int) RID_REGISTER)
3848 error ("function definition declared `register'");
3849 if (specbits & 1 << (int) RID_TYPEDEF)
3850 error ("function definition declared `typedef'");
3851 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3852 | (1 << (int) RID_AUTO));
3854 else if (decl_context != NORMAL && nclasses > 0)
3856 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3860 error ((decl_context == FIELD
3861 ? "storage class specified for structure field `%s'"
3862 : (decl_context == PARM
3863 ? "storage class specified for parameter `%s'"
3864 : "storage class specified for typename")),
3866 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3867 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3868 | (1 << (int) RID_EXTERN));
3871 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3873 /* `extern' with initialization is invalid if not at top level. */
3874 if (current_binding_level == global_binding_level)
3875 warning ("`%s' initialized and declared `extern'", name);
3877 error ("`%s' has both `extern' and initializer", name);
3879 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
3880 && current_binding_level != global_binding_level)
3881 error ("nested function `%s' declared `extern'", name);
3882 else if (current_binding_level == global_binding_level
3883 && specbits & (1 << (int) RID_AUTO))
3884 error ("top-level declaration of `%s' specifies `auto'", name);
3887 /* Now figure out the structure of the declarator proper.
3888 Descend through it, creating more complex types, until we reach
3889 the declared identifier (or NULL_TREE, in an absolute declarator). */
3891 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3893 if (type == error_mark_node)
3895 declarator = TREE_OPERAND (declarator, 0);
3899 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3900 an INDIRECT_REF (for *...),
3901 a CALL_EXPR (for ...(...)),
3902 an identifier (for the name being declared)
3903 or a null pointer (for the place in an absolute declarator
3904 where the name was omitted).
3905 For the last two cases, we have just exited the loop.
3907 At this point, TYPE is the type of elements of an array,
3908 or for a function to return, or for a pointer to point to.
3909 After this sequence of ifs, TYPE is the type of the
3910 array or function or pointer, and DECLARATOR has had its
3911 outermost layer removed. */
3913 if (TREE_CODE (declarator) == ARRAY_REF)
3915 register tree itype = NULL_TREE;
3916 register tree size = TREE_OPERAND (declarator, 1);
3918 declarator = TREE_OPERAND (declarator, 0);
3920 /* Check for some types that there cannot be arrays of. */
3922 if (TYPE_MAIN_VARIANT (type) == void_type_node)
3924 error ("declaration of `%s' as array of voids", name);
3925 type = error_mark_node;
3928 if (TREE_CODE (type) == FUNCTION_TYPE)
3930 error ("declaration of `%s' as array of functions", name);
3931 type = error_mark_node;
3934 if (size == error_mark_node)
3935 type = error_mark_node;
3937 if (type == error_mark_node)
3940 /* If size was specified, set ITYPE to a range-type for that size.
3941 Otherwise, ITYPE remains null. finish_decl may figure it out
3942 from an initial value. */
3946 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3947 STRIP_TYPE_NOPS (size);
3949 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
3950 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
3952 error ("size of array `%s' has non-integer type", name);
3953 size = integer_one_node;
3955 if (pedantic && integer_zerop (size))
3956 pedwarn ("ANSI C forbids zero-size array `%s'", name);
3957 if (TREE_CODE (size) == INTEGER_CST)
3959 if (INT_CST_LT (size, integer_zero_node))
3961 error ("size of array `%s' is negative", name);
3962 size = integer_one_node;
3964 itype = build_index_type (size_binop (MINUS_EXPR, size,
3970 pedwarn ("ANSI C forbids variable-size array `%s'", name);
3971 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
3973 /* Make sure the array size remains visibly nonconstant
3974 even if it is (eg) a const variable with known value. */
3976 itype = variable_size (itype);
3977 itype = build_index_type (itype);
3981 #if 0 /* This had bad results for pointers to arrays, as in
3982 union incomplete (*foo)[4]; */
3983 /* Complain about arrays of incomplete types, except in typedefs. */
3985 if (TYPE_SIZE (type) == 0
3986 /* Avoid multiple warnings for nested array types. */
3987 && TREE_CODE (type) != ARRAY_TYPE
3988 && !(specbits & (1 << (int) RID_TYPEDEF))
3989 && !C_TYPE_BEING_DEFINED (type))
3990 warning ("array type has incomplete element type");
3993 /* Build the array type itself.
3994 Merge any constancy or volatility into the target type. */
3996 #if 0 /* We shouldn't have a function type here at all!
3997 Functions aren't allowed as array elements. */
3998 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3999 && (constp || volatilep))
4000 pedwarn ("ANSI C forbids const or volatile function types");
4002 if (constp || volatilep)
4003 type = c_build_type_variant (type, constp, volatilep);
4005 #if 0 /* don't clear these; leave them set so that the array type
4006 or the variable is itself const or volatile. */
4011 type = build_array_type (type, itype);
4013 C_TYPE_VARIABLE_SIZE (type) = 1;
4015 else if (TREE_CODE (declarator) == CALL_EXPR)
4017 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4018 || current_binding_level == global_binding_level);
4021 /* Declaring a function type.
4022 Make sure we have a valid type for the function to return. */
4023 if (type == error_mark_node)
4028 /* Warn about some types functions can't return. */
4030 if (TREE_CODE (type) == FUNCTION_TYPE)
4032 error ("`%s' declared as function returning a function", name);
4033 type = integer_type_node;
4035 if (TREE_CODE (type) == ARRAY_TYPE)
4037 error ("`%s' declared as function returning an array", name);
4038 type = integer_type_node;
4041 #ifndef TRADITIONAL_RETURN_FLOAT
4042 /* Traditionally, declaring return type float means double. */
4044 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4045 type = double_type_node;
4046 #endif /* TRADITIONAL_RETURN_FLOAT */
4048 /* If this is a block level extern, it must live past the end
4049 of the function so that we can check it against other extern
4050 declarations (IDENTIFIER_LIMBO_VALUE). */
4051 if (extern_ref && allocation_temporary_p ())
4052 end_temporary_allocation ();
4054 /* Construct the function type and go to the next
4055 inner layer of declarator. */
4057 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4059 /* Say it's a definition
4060 only for the CALL_EXPR
4061 closest to the identifier. */
4062 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4063 #if 0 /* This seems to be false. We turn off temporary allocation
4064 above in this function if -traditional.
4065 And this code caused inconsistent results with prototypes:
4066 callers would ignore them, and pass arguments wrong. */
4068 /* Omit the arg types if -traditional, since the arg types
4069 and the list links might not be permanent. */
4070 type = build_function_type (type,
4072 ? NULL_TREE : arg_types);
4074 type = build_function_type (type, arg_types);
4075 declarator = TREE_OPERAND (declarator, 0);
4077 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4078 the formal parameter list of this FUNCTION_TYPE to point to
4079 the FUNCTION_TYPE node itself. */
4084 for (link = current_function_parm_tags;
4086 link = TREE_CHAIN (link))
4087 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4090 else if (TREE_CODE (declarator) == INDIRECT_REF)
4092 /* Merge any constancy or volatility into the target type
4095 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4096 && (constp || volatilep))
4097 pedwarn ("ANSI C forbids const or volatile function types");
4098 if (constp || volatilep)
4099 type = c_build_type_variant (type, constp, volatilep);
4104 type = build_pointer_type (type);
4106 /* Process a list of type modifier keywords
4107 (such as const or volatile) that were given inside the `*'. */
4109 if (TREE_TYPE (declarator))
4111 register tree typemodlist;
4113 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4114 typemodlist = TREE_CHAIN (typemodlist))
4116 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4118 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4123 error ("invalid type modifier within pointer declarator");
4127 pedwarn ("duplicate `const'");
4129 pedwarn ("duplicate `volatile'");
4132 declarator = TREE_OPERAND (declarator, 0);
4139 /* Now TYPE has the actual type. */
4141 /* If this is declaring a typedef name, return a TYPE_DECL. */
4143 if (specbits & (1 << (int) RID_TYPEDEF))
4146 /* Note that the grammar rejects storage classes
4147 in typenames, fields or parameters */
4148 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4149 && (constp || volatilep))
4150 pedwarn ("ANSI C forbids const or volatile function types");
4151 if (constp || volatilep)
4152 type = c_build_type_variant (type, constp, volatilep);
4154 decl = build_decl (TYPE_DECL, declarator, type);
4155 if ((specbits & (1 << (int) RID_SIGNED))
4156 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4157 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4161 /* Detect the case of an array type of unspecified size
4162 which came, as such, direct from a typedef name.
4163 We must copy the type, so that each identifier gets
4164 a distinct type, so that each identifier's size can be
4165 controlled separately by its own initializer. */
4167 if (type != 0 && typedef_type != 0
4168 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4169 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4171 type = build_array_type (TREE_TYPE (type), 0);
4173 C_TYPE_VARIABLE_SIZE (type) = 1;
4176 /* If this is a type name (such as, in a cast or sizeof),
4177 compute the type and return it now. */
4179 if (decl_context == TYPENAME)
4181 /* Note that the grammar rejects storage classes
4182 in typenames, fields or parameters */
4183 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4184 && (constp || volatilep))
4185 pedwarn ("ANSI C forbids const or volatile function types");
4186 if (constp || volatilep)
4187 type = c_build_type_variant (type, constp, volatilep);
4192 /* `void' at top level (not within pointer)
4193 is allowed only in typedefs or type names.
4194 We don't complain about parms either, but that is because
4195 a better error message can be made later. */
4197 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM)
4199 error ("variable or field `%s' declared void",
4200 IDENTIFIER_POINTER (declarator));
4201 type = integer_type_node;
4204 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4205 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4210 if (decl_context == PARM)
4212 tree type_as_written = type;
4215 /* A parameter declared as an array of T is really a pointer to T.
4216 One declared as a function is really a pointer to a function. */
4218 if (TREE_CODE (type) == ARRAY_TYPE)
4220 /* Transfer const-ness of array into that of type pointed to. */
4221 type = build_pointer_type
4222 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4223 volatilep = constp = 0;
4226 else if (TREE_CODE (type) == FUNCTION_TYPE)
4228 if (pedantic && (constp || volatilep))
4229 pedwarn ("ANSI C forbids const or volatile function types");
4230 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4231 volatilep = constp = 0;
4234 decl = build_decl (PARM_DECL, declarator, type);
4236 C_DECL_VARIABLE_SIZE (decl) = 1;
4238 /* Compute the type actually passed in the parmlist,
4239 for the case where there is no prototype.
4240 (For example, shorts and chars are passed as ints.)
4241 When there is a prototype, this is overridden later. */
4243 DECL_ARG_TYPE (decl) = type;
4244 main_type = TYPE_MAIN_VARIANT (type);
4245 if (main_type == float_type_node)
4246 DECL_ARG_TYPE (decl) = double_type_node;
4247 /* Don't use TYPE_PRECISION to decide whether to promote,
4248 because we should convert short if it's the same size as int,
4249 but we should not convert long if it's the same size as int. */
4250 else if (C_PROMOTING_INTEGER_TYPE_P (main_type))
4252 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4253 && TREE_UNSIGNED (type))
4254 DECL_ARG_TYPE (decl) = unsigned_type_node;
4256 DECL_ARG_TYPE (decl) = integer_type_node;
4259 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4261 else if (decl_context == FIELD)
4263 /* Structure field. It may not be a function. */
4265 if (TREE_CODE (type) == FUNCTION_TYPE)
4267 error ("field `%s' declared as a function",
4268 IDENTIFIER_POINTER (declarator));
4269 type = build_pointer_type (type);
4271 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4273 error ("field `%s' has incomplete type",
4274 IDENTIFIER_POINTER (declarator));
4275 type = error_mark_node;
4277 /* Move type qualifiers down to element of an array. */
4278 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4280 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4282 TYPE_DOMAIN (type));
4283 #if 0 /* Leave the field const or volatile as well. */
4284 constp = volatilep = 0;
4287 decl = build_decl (FIELD_DECL, declarator, type);
4289 C_DECL_VARIABLE_SIZE (decl) = 1;
4291 else if (TREE_CODE (type) == FUNCTION_TYPE)
4293 /* Every function declaration is "external"
4294 except for those which are inside a function body
4295 in which `auto' is used.
4296 That is a case not specified by ANSI C,
4297 and we use it for forward declarations for nested functions. */
4298 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4299 || current_binding_level == global_binding_level);
4301 if (specbits & (1 << (int) RID_AUTO)
4302 && (pedantic || current_binding_level == global_binding_level))
4303 pedwarn ("invalid storage class for function `%s'",
4304 IDENTIFIER_POINTER (declarator));
4305 if (specbits & (1 << (int) RID_REGISTER))
4306 error ("invalid storage class for function `%s'",
4307 IDENTIFIER_POINTER (declarator));
4308 /* Function declaration not at top level.
4309 Storage classes other than `extern' are not allowed
4310 and `extern' makes no difference. */
4311 if (current_binding_level != global_binding_level
4312 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4314 pedwarn ("invalid storage class for function `%s'",
4315 IDENTIFIER_POINTER (declarator));
4317 /* If this is a block level extern, it must live past the end
4318 of the function so that we can check it against other
4319 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4320 if (extern_ref && allocation_temporary_p ())
4321 end_temporary_allocation ();
4323 decl = build_decl (FUNCTION_DECL, declarator, type);
4325 if (pedantic && (constp || volatilep)
4326 && ! DECL_IN_SYSTEM_HEADER (decl))
4327 pedwarn ("ANSI C forbids const or volatile functions");
4330 DECL_EXTERNAL (decl) = 1;
4331 /* Record absence of global scope for `static' or `auto'. */
4333 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4334 /* Record presence of `inline', if it is reasonable. */
4337 tree last = tree_last (TYPE_ARG_TYPES (type));
4339 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4340 warning ("cannot inline function `main'");
4341 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4343 warning ("inline declaration ignored for function with `...'");
4345 /* Assume that otherwise the function can be inlined. */
4346 DECL_INLINE (decl) = 1;
4348 if (specbits & (1 << (int) RID_EXTERN))
4349 current_extern_inline = 1;
4354 /* It's a variable. */
4355 /* An uninitialized decl with `extern' is a reference. */
4356 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4358 /* Move type qualifiers down to element of an array. */
4359 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4361 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4363 TYPE_DOMAIN (type));
4364 #if 0 /* Leave the variable const or volatile as well. */
4365 constp = volatilep = 0;
4369 /* If this is a block level extern, it must live past the end
4370 of the function so that we can check it against other
4371 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4372 if (extern_ref && allocation_temporary_p ())
4373 end_temporary_allocation ();
4375 decl = build_decl (VAR_DECL, declarator, type);
4377 C_DECL_VARIABLE_SIZE (decl) = 1;
4380 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4382 DECL_EXTERNAL (decl) = extern_ref;
4383 /* At top level, the presence of a `static' or `register' storage
4384 class specifier, or the absence of all storage class specifiers
4385 makes this declaration a definition (perhaps tentative). Also,
4386 the absence of both `static' and `register' makes it public. */
4387 if (current_binding_level == global_binding_level)
4391 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4392 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4394 /* Not at top level, only `static' makes a static definition. */
4397 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4398 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4402 /* Record `register' declaration for warnings on &
4403 and in case doing stupid register allocation. */
4405 if (specbits & (1 << (int) RID_REGISTER))
4406 DECL_REGISTER (decl) = 1;
4408 /* Record constancy and volatility. */
4411 TREE_READONLY (decl) = 1;
4414 TREE_SIDE_EFFECTS (decl) = 1;
4415 TREE_THIS_VOLATILE (decl) = 1;
4417 /* If a type has volatile components, it should be stored in memory.
4418 Otherwise, the fact that those components are volatile
4419 will be ignored, and would even crash the compiler. */
4420 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4421 mark_addressable (decl);
4429 /* Make a variant type in the proper way for C, propagating qualifiers
4430 down to the element type of an array. */
4433 c_build_type_variant (type, constp, volatilep)
4435 int constp, volatilep;
4437 if (TREE_CODE (type) == ARRAY_TYPE)
4438 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4440 TYPE_DOMAIN (type));
4441 return build_type_variant (type, constp, volatilep);
4444 /* Decode the parameter-list info for a function type or function definition.
4445 The argument is the value returned by `get_parm_info' (or made in parse.y
4446 if there is an identifier list instead of a parameter decl list).
4447 These two functions are separate because when a function returns
4448 or receives functions then each is called multiple times but the order
4449 of calls is different. The last call to `grokparms' is always the one
4450 that contains the formal parameter names of a function definition.
4452 Store in `last_function_parms' a chain of the decls of parms.
4453 Also store in `last_function_parm_tags' a chain of the struct, union,
4454 and enum tags declared among the parms.
4456 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4458 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4459 a mere declaration. A nonempty identifier-list gets an error message
4460 when FUNCDEF_FLAG is zero. */
4463 grokparms (parms_info, funcdef_flag)
4467 tree first_parm = TREE_CHAIN (parms_info);
4469 last_function_parms = TREE_PURPOSE (parms_info);
4470 last_function_parm_tags = TREE_VALUE (parms_info);
4472 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4473 && !in_system_header)
4474 warning ("function declaration isn't a prototype");
4477 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4480 pedwarn ("parameter names (without types) in function declaration");
4482 last_function_parms = first_parm;
4489 /* We no longer test FUNCDEF_FLAG.
4490 If the arg types are incomplete in a declaration,
4491 they must include undefined tags.
4492 These tags can never be defined in the scope of the declaration,
4493 so the types can never be completed,
4494 and no call can be compiled successfully. */
4496 /* In a fcn definition, arg types must be complete. */
4499 for (parm = last_function_parms, typelt = first_parm;
4501 parm = TREE_CHAIN (parm))
4502 /* Skip over any enumeration constants declared here. */
4503 if (TREE_CODE (parm) == PARM_DECL)
4505 /* Barf if the parameter itself has an incomplete type. */
4506 tree type = TREE_VALUE (typelt);
4507 if (TYPE_SIZE (type) == 0)
4509 if (funcdef_flag && DECL_NAME (parm) != 0)
4510 error ("parameter `%s' has incomplete type",
4511 IDENTIFIER_POINTER (DECL_NAME (parm)));
4513 warning ("parameter has incomplete type");
4516 TREE_VALUE (typelt) = error_mark_node;
4517 TREE_TYPE (parm) = error_mark_node;
4520 #if 0 /* This has been replaced by parm_tags_warning
4521 which uses a more accurate criterion for what to warn about. */
4524 /* Now warn if is a pointer to an incomplete type. */
4525 while (TREE_CODE (type) == POINTER_TYPE
4526 || TREE_CODE (type) == REFERENCE_TYPE)
4527 type = TREE_TYPE (type);
4528 type = TYPE_MAIN_VARIANT (type);
4529 if (TYPE_SIZE (type) == 0)
4531 if (DECL_NAME (parm) != 0)
4532 warning ("parameter `%s' points to incomplete type",
4533 IDENTIFIER_POINTER (DECL_NAME (parm)));
4535 warning ("parameter points to incomplete type");
4539 typelt = TREE_CHAIN (typelt);
4542 /* Allocate the list of types the way we allocate a type. */
4543 if (first_parm && ! TREE_PERMANENT (first_parm))
4545 /* Construct a copy of the list of types
4546 on the saveable obstack. */
4548 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4549 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4551 return nreverse (result);
4554 /* The list we have is permanent already. */
4560 /* Return a tree_list node with info on a parameter list just parsed.
4561 The TREE_PURPOSE is a chain of decls of those parms.
4562 The TREE_VALUE is a list of structure, union and enum tags defined.
4563 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4564 This tree_list node is later fed to `grokparms'.
4566 VOID_AT_END nonzero means append `void' to the end of the type-list.
4567 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4570 get_parm_info (void_at_end)
4573 register tree decl, t;
4574 register tree types = 0;
4576 tree tags = gettags ();
4577 tree parms = getdecls ();
4579 tree order = current_binding_level->parm_order;
4581 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4582 if (void_at_end && parms != 0
4583 && TREE_CHAIN (parms) == 0
4584 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4585 && DECL_NAME (parms) == 0)
4588 storedecls (NULL_TREE);
4589 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4590 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4593 /* Extract enumerator values and other non-parms declared with the parms.
4594 Likewise any forward parm decls that didn't have real parm decls. */
4595 for (decl = parms; decl; )
4597 tree next = TREE_CHAIN (decl);
4599 if (TREE_CODE (decl) != PARM_DECL)
4601 TREE_CHAIN (decl) = new_parms;
4604 else if (TREE_ASM_WRITTEN (decl))
4606 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4607 TREE_CHAIN (decl) = new_parms;
4613 /* Put the parm decls back in the order they were in in the parm list. */
4614 for (t = order; t; t = TREE_CHAIN (t))
4617 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4619 TREE_CHAIN (TREE_VALUE (t)) = 0;
4622 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4625 /* Store the parmlist in the binding level since the old one
4626 is no longer a valid list. (We have changed the chain pointers.) */
4627 storedecls (new_parms);
4629 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4630 /* There may also be declarations for enumerators if an enumeration
4631 type is declared among the parms. Ignore them here. */
4632 if (TREE_CODE (decl) == PARM_DECL)
4634 /* Since there is a prototype,
4635 args are passed in their declared types. */
4636 tree type = TREE_TYPE (decl);
4637 DECL_ARG_TYPE (decl) = type;
4638 #ifdef PROMOTE_PROTOTYPES
4639 if (TREE_CODE (type) == INTEGER_TYPE
4640 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4641 DECL_ARG_TYPE (decl) = integer_type_node;
4644 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4645 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4646 && DECL_NAME (decl) == 0)
4648 error ("`void' in parameter list must be the entire list");
4654 return saveable_tree_cons (new_parms, tags,
4655 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4657 return saveable_tree_cons (new_parms, tags, nreverse (types));
4660 /* At end of parameter list, warn about any struct, union or enum tags
4661 defined within. Do so because these types cannot ever become complete. */
4664 parmlist_tags_warning ()
4669 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4671 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4672 /* An anonymous union parm type is meaningful as a GNU extension.
4673 So don't warn for that. */
4674 if (code == UNION_TYPE && !pedantic)
4676 if (TREE_PURPOSE (elt) != 0)
4677 warning ("`%s %s' declared inside parameter list",
4678 (code == RECORD_TYPE ? "struct"
4679 : code == UNION_TYPE ? "union"
4681 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4683 warning ("anonymous %s declared inside parameter list",
4684 (code == RECORD_TYPE ? "struct"
4685 : code == UNION_TYPE ? "union"
4690 warning ("its scope is only this definition or declaration,");
4691 warning ("which is probably not what you want.");
4697 /* Get the struct, enum or union (CODE says which) with tag NAME.
4698 Define the tag as a forward-reference if it is not defined. */
4701 xref_tag (code, name)
4702 enum tree_code code;
4705 int temporary = allocation_temporary_p ();
4707 /* If a cross reference is requested, look up the type
4708 already defined for this tag and return it. */
4710 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4711 /* Even if this is the wrong type of tag, return what we found.
4712 There will be an error message anyway, from pending_xref_error.
4713 If we create an empty xref just for an invalid use of the type,
4714 the main result is to create lots of superfluous error messages. */
4718 push_obstacks_nochange ();
4720 if (current_binding_level == global_binding_level && temporary)
4721 end_temporary_allocation ();
4723 /* If no such tag is yet defined, create a forward-reference node
4724 and record it as the "definition".
4725 When a real declaration of this type is found,
4726 the forward-reference will be altered into a real type. */
4728 ref = make_node (code);
4729 if (code == ENUMERAL_TYPE)
4731 /* (In ANSI, Enums can be referred to only if already defined.) */
4733 pedwarn ("ANSI C forbids forward references to `enum' types");
4734 /* Give the type a default layout like unsigned int
4735 to avoid crashing if it does not get defined. */
4736 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4737 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4738 TREE_UNSIGNED (ref) = 1;
4739 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4740 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4741 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4744 pushtag (name, ref);
4751 /* Make sure that the tag NAME is defined *in the current binding level*
4752 at least as a forward reference.
4753 CODE says which kind of tag NAME ought to be.
4755 We also do a push_obstacks_nochange
4756 whose matching pop is in finish_struct. */
4759 start_struct (code, name)
4760 enum tree_code code;
4763 /* If there is already a tag defined at this binding level
4764 (as a forward reference), just return it. */
4766 register tree ref = 0;
4768 push_obstacks_nochange ();
4769 if (current_binding_level == global_binding_level)
4770 end_temporary_allocation ();
4773 ref = lookup_tag (code, name, current_binding_level, 1);
4774 if (ref && TREE_CODE (ref) == code)
4776 C_TYPE_BEING_DEFINED (ref) = 1;
4777 if (TYPE_FIELDS (ref))
4778 error ((code == UNION_TYPE ? "redefinition of `union %s'"
4779 : "redefinition of `struct %s'"),
4780 IDENTIFIER_POINTER (name));
4785 /* Otherwise create a forward-reference just so the tag is in scope. */
4787 ref = make_node (code);
4788 pushtag (name, ref);
4789 C_TYPE_BEING_DEFINED (ref) = 1;
4793 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4794 of a structure component, returning a FIELD_DECL node.
4795 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4797 This is done during the parsing of the struct declaration.
4798 The FIELD_DECL nodes are chained together and the lot of them
4799 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4802 grokfield (filename, line, declarator, declspecs, width)
4805 tree declarator, declspecs, width;
4809 /* The corresponding pop_obstacks is in finish_decl. */
4810 push_obstacks_nochange ();
4812 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4814 finish_decl (value, NULL_TREE, NULL_TREE);
4815 DECL_INITIAL (value) = width;
4820 /* Function to help qsort sort FIELD_DECLs by name order. */
4823 field_decl_cmp (x, y)
4826 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
4829 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4830 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4832 We also do a pop_obstacks to match the push in start_struct. */
4835 finish_struct (t, fieldlist)
4836 register tree t, fieldlist;
4840 int toplevel = global_binding_level == current_binding_level;
4842 /* If this type was previously laid out as a forward reference,
4843 make sure we lay it out again. */
4847 /* Nameless union parm types are useful as GCC extension. */
4848 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4849 /* Otherwise, warn about any struct or union def. in parmlist. */
4850 if (in_parm_level_p ())
4853 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4854 : "structure defined inside parms"));
4855 else if (! flag_traditional)
4856 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4857 : "structure defined inside parms"));
4860 old_momentary = suspend_momentary ();
4862 if (fieldlist == 0 && pedantic)
4863 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
4864 : "structure has no members"));
4866 /* Install struct as DECL_CONTEXT of each field decl.
4867 Also process specified field sizes.
4868 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
4869 The specified size is found in the DECL_INITIAL.
4870 Store 0 there, except for ": 0" fields (so we can find them
4871 and delete them, below). */
4873 for (x = fieldlist; x; x = TREE_CHAIN (x))
4875 DECL_CONTEXT (x) = t;
4876 DECL_FIELD_SIZE (x) = 0;
4878 /* If any field is const, the structure type is pseudo-const. */
4879 if (TREE_READONLY (x))
4880 C_TYPE_FIELDS_READONLY (t) = 1;
4883 /* A field that is pseudo-const makes the structure likewise. */
4884 tree t1 = TREE_TYPE (x);
4885 while (TREE_CODE (t1) == ARRAY_TYPE)
4886 t1 = TREE_TYPE (t1);
4887 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4888 && C_TYPE_FIELDS_READONLY (t1))
4889 C_TYPE_FIELDS_READONLY (t) = 1;
4892 /* Any field that is volatile means variables of this type must be
4893 treated in some ways as volatile. */
4894 if (TREE_THIS_VOLATILE (x))
4895 C_TYPE_FIELDS_VOLATILE (t) = 1;
4897 /* Any field of nominal variable size implies structure is too. */
4898 if (C_DECL_VARIABLE_SIZE (x))
4899 C_TYPE_VARIABLE_SIZE (t) = 1;
4901 /* Detect invalid nested redefinition. */
4902 if (TREE_TYPE (x) == t)
4903 error ("nested redefinition of `%s'",
4904 IDENTIFIER_POINTER (TYPE_NAME (t)));
4906 /* Detect invalid bit-field size. */
4907 if (DECL_INITIAL (x))
4908 STRIP_NOPS (DECL_INITIAL (x));
4909 if (DECL_INITIAL (x) && TREE_CODE (DECL_INITIAL (x)) != INTEGER_CST)
4911 error_with_decl (x, "bit-field `%s' width not an integer constant");
4912 DECL_INITIAL (x) = NULL;
4915 /* Detect invalid bit-field type. */
4916 if (DECL_INITIAL (x)
4917 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4918 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4920 error_with_decl (x, "bit-field `%s' has invalid type");
4921 DECL_INITIAL (x) = NULL;
4923 if (DECL_INITIAL (x) && pedantic
4924 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4925 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node)
4926 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
4928 /* Detect and ignore out of range field width. */
4929 if (DECL_INITIAL (x))
4931 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4933 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
4935 DECL_INITIAL (x) = NULL;
4936 error_with_decl (x, "negative width in bit-field `%s'");
4938 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
4939 || width > TYPE_PRECISION (TREE_TYPE (x)))
4941 DECL_INITIAL (x) = NULL;
4942 pedwarn_with_decl (x, "width of `%s' exceeds its type");
4944 else if (width == 0 && DECL_NAME (x) != 0)
4946 error_with_decl (x, "zero width for bit-field `%s'");
4947 DECL_INITIAL (x) = NULL;
4951 /* Process valid field width. */
4952 if (DECL_INITIAL (x))
4954 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4956 DECL_FIELD_SIZE (x) = width;
4957 DECL_BIT_FIELD (x) = 1;
4958 DECL_INITIAL (x) = NULL;
4962 /* field size 0 => force desired amount of alignment. */
4963 #ifdef EMPTY_FIELD_BOUNDARY
4964 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
4966 #ifdef PCC_BITFIELD_TYPE_MATTERS
4967 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
4968 TYPE_ALIGN (TREE_TYPE (x)));
4974 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
4975 : TYPE_ALIGN (TREE_TYPE (x)));
4976 /* Non-bit-fields are aligned for their type, except packed
4977 fields which require only BITS_PER_UNIT alignment. */
4978 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
4982 /* Now DECL_INITIAL is null on all members. */
4984 /* Delete all duplicate fields from the fieldlist */
4985 for (x = fieldlist; x && TREE_CHAIN (x);)
4986 /* Anonymous fields aren't duplicates. */
4987 if (DECL_NAME (TREE_CHAIN (x)) == 0)
4991 register tree y = fieldlist;
4995 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5001 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5003 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5004 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5006 else x = TREE_CHAIN (x);
5009 /* Now we have the nearly final fieldlist. Record it,
5010 then lay out the structure or union (including the fields). */
5012 TYPE_FIELDS (t) = fieldlist;
5016 /* Delete all zero-width bit-fields from the front of the fieldlist */
5018 && DECL_INITIAL (fieldlist))
5019 fieldlist = TREE_CHAIN (fieldlist);
5020 /* Delete all such members from the rest of the fieldlist */
5021 for (x = fieldlist; x;)
5023 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5024 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5025 else x = TREE_CHAIN (x);
5028 /* Now we have the truly final field list.
5029 Store it in this type and in the variants. */
5031 TYPE_FIELDS (t) = fieldlist;
5033 /* If there are lots of fields, sort so we can look through them fast.
5034 We arbitrarily consider 16 or more elts to be "a lot". */
5038 for (x = fieldlist; x; x = TREE_CHAIN (x))
5049 len += list_length (x);
5050 /* Use the same allocation policy here that make_node uses, to
5051 ensure that this lives as long as the rest of the struct decl.
5052 All decls in an inline function need to be saved. */
5053 if (allocation_temporary_p ())
5054 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5056 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5058 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5059 TYPE_LANG_SPECIFIC (t)->len = len;
5061 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5063 for (x = fieldlist; x; x = TREE_CHAIN (x))
5064 field_array[len++] = x;
5066 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5070 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5072 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5073 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5074 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5077 /* Promote each bit-field's type to int if it is narrower than that. */
5078 for (x = fieldlist; x; x = TREE_CHAIN (x))
5079 if (DECL_BIT_FIELD (x)
5080 && C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)))
5082 tree type = TREE_TYPE (x);
5084 /* Preserve unsignedness if traditional or if not really any wider. */
5085 if (TREE_UNSIGNED (type)
5086 && (flag_traditional
5087 || (TYPE_PRECISION (type)
5088 == TYPE_PRECISION (integer_type_node))))
5089 TREE_TYPE (x) = unsigned_type_node;
5091 TREE_TYPE (x) = integer_type_node;
5094 /* If this structure or union completes the type of any previous
5095 variable declaration, lay it out and output its rtl. */
5097 if (current_binding_level->n_incomplete != 0)
5100 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5102 if (TREE_TYPE (decl) == t
5103 && TREE_CODE (decl) != TYPE_DECL)
5105 layout_decl (decl, 0);
5106 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5107 maybe_objc_check_decl (decl);
5108 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5111 --current_binding_level->n_incomplete;
5113 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5114 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5116 tree element = TREE_TYPE (decl);
5117 while (TREE_CODE (element) == ARRAY_TYPE)
5118 element = TREE_TYPE (element);
5120 layout_array_type (TREE_TYPE (decl));
5125 resume_momentary (old_momentary);
5127 /* Finish debugging output for this type. */
5128 rest_of_type_compilation (t, toplevel);
5130 /* The matching push is in start_struct. */
5136 /* Lay out the type T, and its element type, and so on. */
5139 layout_array_type (t)
5142 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5143 layout_array_type (TREE_TYPE (t));
5147 /* Begin compiling the definition of an enumeration type.
5148 NAME is its name (or null if anonymous).
5149 Returns the type object, as yet incomplete.
5150 Also records info about it so that build_enumerator
5151 may be used to declare the individual values as they are read. */
5157 register tree enumtype = 0;
5159 /* If this is the real definition for a previous forward reference,
5160 fill in the contents in the same object that used to be the
5161 forward reference. */
5164 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5166 /* The corresponding pop_obstacks is in finish_enum. */
5167 push_obstacks_nochange ();
5168 /* If these symbols and types are global, make them permanent. */
5169 if (current_binding_level == global_binding_level)
5170 end_temporary_allocation ();
5172 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5174 enumtype = make_node (ENUMERAL_TYPE);
5175 pushtag (name, enumtype);
5178 C_TYPE_BEING_DEFINED (enumtype) = 1;
5180 if (TYPE_VALUES (enumtype) != 0)
5182 /* This enum is a named one that has been declared already. */
5183 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5185 /* Completely replace its old definition.
5186 The old enumerators remain defined, however. */
5187 TYPE_VALUES (enumtype) = 0;
5190 enum_next_value = integer_zero_node;
5196 /* After processing and defining all the values of an enumeration type,
5197 install their decls in the enumeration type and finish it off.
5198 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5199 Returns ENUMTYPE. */
5202 finish_enum (enumtype, values)
5203 register tree enumtype, values;
5206 tree minnode = 0, maxnode = 0;
5207 register HOST_WIDE_INT maxvalue = 0;
5208 register HOST_WIDE_INT minvalue = 0;
5210 unsigned precision = 0;
5211 int toplevel = global_binding_level == current_binding_level;
5212 int temporary = allocation_temporary_p ();
5214 if (in_parm_level_p ())
5215 warning ("enum defined inside parms");
5217 /* Calculate the maximum value of any enumerator in this type. */
5219 for (pair = values; pair; pair = TREE_CHAIN (pair))
5221 tree value = TREE_VALUE (pair);
5223 minnode = maxnode = TREE_VALUE (pair);
5226 if (tree_int_cst_lt (maxnode, value))
5228 if (tree_int_cst_lt (value, minnode))
5233 TYPE_MIN_VALUE (enumtype) = minnode;
5234 TYPE_MAX_VALUE (enumtype) = maxnode;
5236 /* Determine the precision this type needs. */
5238 if (TREE_INT_CST_HIGH (minnode) >= 0
5239 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5240 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5241 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5242 precision = TYPE_PRECISION (long_long_integer_type_node);
5245 maxvalue = TREE_INT_CST_LOW (maxnode);
5246 minvalue = TREE_INT_CST_LOW (minnode);
5249 precision = floor_log2 (maxvalue) + 1;
5252 /* Compute number of bits to represent magnitude of a negative value.
5253 Add one to MINVALUE since range of negative numbers
5254 includes the power of two. */
5255 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5256 if (negprecision > precision)
5257 precision = negprecision;
5258 precision += 1; /* room for sign bit */
5265 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5266 /* Use the width of the narrowest normal C type which is wide enough. */
5267 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5269 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5271 TYPE_SIZE (enumtype) = 0;
5272 layout_type (enumtype);
5274 /* An enum can have some negative values; then it is signed. */
5275 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5277 /* If the enumerators might not fit in an int, change their type now. */
5278 /* It seems more useful in the debugger to leave these as int
5279 unless the enumerator is wider than int. */
5280 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5281 for (pair = values; pair; pair = TREE_CHAIN (pair))
5283 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5284 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5285 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5286 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5289 /* Replace the decl nodes in VALUES with their names. */
5290 for (pair = values; pair; pair = TREE_CHAIN (pair))
5291 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5293 TYPE_VALUES (enumtype) = values;
5295 /* Finish debugging output for this type. */
5296 rest_of_type_compilation (enumtype, toplevel);
5298 /* This matches a push in start_enum. */
5304 /* Build and install a CONST_DECL for one value of the
5305 current enumeration type (one that was begun with start_enum).
5306 Return a tree-list containing the CONST_DECL and its value.
5307 Assignment of sequential values by default is handled here. */
5310 build_enumerator (name, value)
5315 /* Validate and default VALUE. */
5317 /* Remove no-op casts from the value. */
5319 STRIP_TYPE_NOPS (value);
5321 if (value != 0 && TREE_CODE (value) != INTEGER_CST)
5323 error ("enumerator value for `%s' not integer constant",
5324 IDENTIFIER_POINTER (name));
5328 /* Default based on previous value. */
5329 /* It should no longer be possible to have NON_LVALUE_EXPR
5333 value = enum_next_value;
5335 error ("overflow in enumeration values");
5338 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5340 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5341 value = integer_zero_node;
5344 /* Set basis for default for next value. */
5345 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5346 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5348 /* Now create a declaration for the enum value name. */
5350 decl = build_decl (CONST_DECL, name, integer_type_node);
5351 DECL_INITIAL (decl) = value;
5352 TREE_TYPE (value) = integer_type_node;
5355 return saveable_tree_cons (decl, value, NULL_TREE);
5358 /* Create the FUNCTION_DECL for a function definition.
5359 DECLSPECS and DECLARATOR are the parts of the declaration;
5360 they describe the function's name and the type it returns,
5361 but twisted together in a fashion that parallels the syntax of C.
5363 This function creates a binding context for the function body
5364 as well as setting up the FUNCTION_DECL in current_function_decl.
5366 Returns 1 on success. If the DECLARATOR is not suitable for a function
5367 (it defines a datum instead), we return 0, which tells
5368 yyparse to report a parse error.
5370 NESTED is nonzero for a function nested within another function. */
5373 start_function (declspecs, declarator, nested)
5374 tree declarator, declspecs;
5377 tree decl1, old_decl;
5380 current_function_returns_value = 0; /* Assume, until we see it does. */
5381 current_function_returns_null = 0;
5382 warn_about_return_type = 0;
5383 current_extern_inline = 0;
5384 c_function_varargs = 0;
5386 shadowed_labels = 0;
5388 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5390 /* If the declarator is not suitable for a function definition,
5391 cause a syntax error. */
5395 announce_function (decl1);
5397 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5399 error ("return-type is an incomplete type");
5400 /* Make it return void instead. */
5402 = build_function_type (void_type_node,
5403 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5406 if (warn_about_return_type)
5407 warning ("return-type defaults to `int'");
5409 /* Save the parm names or decls from this function's declarator
5410 where store_parm_decls will find them. */
5411 current_function_parms = last_function_parms;
5412 current_function_parm_tags = last_function_parm_tags;
5414 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5415 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5416 DECL_INITIAL (decl1) = error_mark_node;
5418 /* If this definition isn't a prototype and we had a prototype declaration
5419 before, copy the arg type info from that prototype.
5420 But not if what we had before was a builtin function. */
5421 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5422 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5423 && !DECL_BUILT_IN (old_decl)
5424 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5425 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5426 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5427 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5429 /* Optionally warn of old-fashioned def with no previous prototype. */
5430 if (warn_strict_prototypes
5431 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5432 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5433 warning ("function declaration isn't a prototype");
5434 /* Optionally warn of any global def with no previous prototype. */
5435 else if (warn_missing_prototypes
5436 && TREE_PUBLIC (decl1)
5437 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5438 warning_with_decl (decl1, "no previous prototype for `%s'");
5439 /* Optionally warn of any def with no previous prototype
5440 if the function has already been used. */
5441 else if (warn_missing_prototypes
5442 && old_decl != 0 && TREE_USED (old_decl)
5443 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5444 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5446 /* This is a definition, not a reference.
5447 So normally clear DECL_EXTERNAL.
5448 However, `extern inline' acts like a declaration
5449 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5450 DECL_EXTERNAL (decl1) = current_extern_inline;
5452 /* This function exists in static storage.
5453 (This does not mean `static' in the C sense!) */
5454 TREE_STATIC (decl1) = 1;
5456 /* A nested function is not global. */
5457 if (current_function_decl != 0)
5458 TREE_PUBLIC (decl1) = 0;
5460 /* Record the decl so that the function name is defined.
5461 If we already have a decl for this name, and it is a FUNCTION_DECL,
5462 use the old decl. */
5464 current_function_decl = pushdecl (decl1);
5467 declare_parm_level (1);
5468 current_binding_level->subblocks_tag_transparent = 1;
5470 make_function_rtl (current_function_decl);
5472 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5473 /* Promote the value to int before returning it. */
5474 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5476 /* It retains unsignedness if traditional
5477 or if not really getting wider. */
5478 if (TREE_UNSIGNED (restype)
5479 && (flag_traditional
5480 || (TYPE_PRECISION (restype)
5481 == TYPE_PRECISION (integer_type_node))))
5482 restype = unsigned_type_node;
5484 restype = integer_type_node;
5486 DECL_RESULT (current_function_decl)
5487 = build_decl (RESULT_DECL, NULL_TREE, restype);
5490 /* Allocate further tree nodes temporarily during compilation
5491 of this function only. */
5492 temporary_allocation ();
5494 /* If this fcn was already referenced via a block-scope `extern' decl
5495 (or an implicit decl), propagate certain information about the usage. */
5496 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5497 TREE_ADDRESSABLE (current_function_decl) = 1;
5502 /* Record that this function is going to be a varargs function.
5503 This is called before store_parm_decls, which is too early
5504 to call mark_varargs directly. */
5509 c_function_varargs = 1;
5512 /* Store the parameter declarations into the current function declaration.
5513 This is called after parsing the parameter declarations, before
5514 digesting the body of the function.
5516 For an old-style definition, modify the function's type
5517 to specify at least the number of arguments. */
5522 register tree fndecl = current_function_decl;
5525 /* This is either a chain of PARM_DECLs (if a prototype was used)
5526 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5527 tree specparms = current_function_parms;
5529 /* This is a list of types declared among parms in a prototype. */
5530 tree parmtags = current_function_parm_tags;
5532 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5533 register tree parmdecls = getdecls ();
5535 /* This is a chain of any other decls that came in among the parm
5536 declarations. If a parm is declared with enum {foo, bar} x;
5537 then CONST_DECLs for foo and bar are put here. */
5540 /* Nonzero if this definition is written with a prototype. */
5543 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5545 /* This case is when the function was defined with an ANSI prototype.
5546 The parms already have decls, so we need not do anything here
5547 except record them as in effect
5548 and complain if any redundant old-style parm decls were written. */
5559 error_with_decl (fndecl,
5560 "parm types given both in parmlist and separately");
5561 /* Get rid of the erroneous decls; don't keep them on
5562 the list of parms, since they might not be PARM_DECLs. */
5563 for (decl = current_binding_level->names;
5564 decl; decl = TREE_CHAIN (decl))
5565 if (DECL_NAME (decl))
5566 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5567 for (link = current_binding_level->shadowed;
5568 link; link = TREE_CHAIN (link))
5569 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5570 current_binding_level->names = 0;
5571 current_binding_level->shadowed = 0;
5574 specparms = nreverse (specparms);
5575 for (parm = specparms; parm; parm = next)
5577 next = TREE_CHAIN (parm);
5578 if (TREE_CODE (parm) == PARM_DECL)
5580 if (DECL_NAME (parm) == 0)
5581 error_with_decl (parm, "parameter name omitted");
5582 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5584 error_with_decl (parm, "parameter `%s' declared void");
5585 /* Change the type to error_mark_node so this parameter
5586 will be ignored by assign_parms. */
5587 TREE_TYPE (parm) = error_mark_node;
5593 /* If we find an enum constant or a type tag,
5594 put it aside for the moment. */
5595 TREE_CHAIN (parm) = 0;
5596 others = chainon (others, parm);
5600 /* Get the decls in their original chain order
5601 and record in the function. */
5602 DECL_ARGUMENTS (fndecl) = getdecls ();
5605 /* If this function takes a variable number of arguments,
5606 add a phony parameter to the end of the parm list,
5607 to represent the position of the first unnamed argument. */
5608 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5611 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5612 /* Let's hope the address of the unnamed parm
5613 won't depend on its type. */
5614 TREE_TYPE (dummy) = integer_type_node;
5615 DECL_ARG_TYPE (dummy) = integer_type_node;
5616 DECL_ARGUMENTS (fndecl)
5617 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5621 /* Now pushdecl the enum constants. */
5622 for (parm = others; parm; parm = next)
5624 next = TREE_CHAIN (parm);
5625 if (DECL_NAME (parm) == 0)
5627 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5629 else if (TREE_CODE (parm) != PARM_DECL)
5633 storetags (chainon (parmtags, gettags ()));
5637 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5638 each with a parm name as the TREE_VALUE.
5640 PARMDECLS is a chain of declarations for parameters.
5641 Warning! It can also contain CONST_DECLs which are not parameters
5642 but are names of enumerators of any enum types
5643 declared among the parameters.
5645 First match each formal parameter name with its declaration.
5646 Associate decls with the names and store the decls
5647 into the TREE_PURPOSE slots. */
5649 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5650 DECL_RESULT (parm) = 0;
5652 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5654 register tree tail, found = NULL;
5656 if (TREE_VALUE (parm) == 0)
5658 error_with_decl (fndecl, "parameter name missing from parameter list");
5659 TREE_PURPOSE (parm) = 0;
5663 /* See if any of the parmdecls specifies this parm by name.
5664 Ignore any enumerator decls. */
5665 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5666 if (DECL_NAME (tail) == TREE_VALUE (parm)
5667 && TREE_CODE (tail) == PARM_DECL)
5673 /* If declaration already marked, we have a duplicate name.
5674 Complain, and don't use this decl twice. */
5675 if (found && DECL_RESULT (found) != 0)
5677 error_with_decl (found, "multiple parameters named `%s'");
5681 /* If the declaration says "void", complain and ignore it. */
5682 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5684 error_with_decl (found, "parameter `%s' declared void");
5685 TREE_TYPE (found) = integer_type_node;
5686 DECL_ARG_TYPE (found) = integer_type_node;
5687 layout_decl (found, 0);
5690 /* Traditionally, a parm declared float is actually a double. */
5691 if (found && flag_traditional
5692 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5693 TREE_TYPE (found) = double_type_node;
5695 /* If no declaration found, default to int. */
5698 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5700 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5701 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5702 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5704 warning_with_decl (found, "type of `%s' defaults to `int'");
5708 TREE_PURPOSE (parm) = found;
5710 /* Mark this decl as "already found" -- see test, above.
5711 It is safe to use DECL_RESULT for this
5712 since it is not used in PARM_DECLs or CONST_DECLs. */
5713 DECL_RESULT (found) = error_mark_node;
5716 /* Put anything which is on the parmdecls chain and which is
5717 not a PARM_DECL onto the list NONPARMS. (The types of
5718 non-parm things which might appear on the list include
5719 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5720 any actual PARM_DECLs not matched with any names. */
5723 for (parm = parmdecls; parm; )
5725 tree next = TREE_CHAIN (parm);
5726 TREE_CHAIN (parm) = 0;
5728 if (TREE_CODE (parm) != PARM_DECL)
5729 nonparms = chainon (nonparms, parm);
5732 /* Complain about args with incomplete types. */
5733 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5735 error_with_decl (parm, "parameter `%s' has incomplete type");
5736 TREE_TYPE (parm) = error_mark_node;
5739 if (DECL_RESULT (parm) == 0)
5741 error_with_decl (parm,
5742 "declaration for parameter `%s' but no such parameter");
5743 /* Pretend the parameter was not missing.
5744 This gets us to a standard state and minimizes
5745 further error messages. */
5747 = chainon (specparms,
5748 tree_cons (parm, NULL_TREE, NULL_TREE));
5755 /* Chain the declarations together in the order of the list of names. */
5756 /* Store that chain in the function decl, replacing the list of names. */
5758 DECL_ARGUMENTS (fndecl) = 0;
5761 for (last = 0; parm; parm = TREE_CHAIN (parm))
5762 if (TREE_PURPOSE (parm))
5765 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5767 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5768 last = TREE_PURPOSE (parm);
5769 TREE_CHAIN (last) = 0;
5773 /* If there was a previous prototype,
5774 set the DECL_ARG_TYPE of each argument according to
5775 the type previously specified, and report any mismatches. */
5777 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5780 for (parm = DECL_ARGUMENTS (fndecl),
5781 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5782 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5783 != void_type_node));
5784 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5786 if (parm == 0 || type == 0
5787 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5789 error ("number of arguments doesn't match prototype");
5792 /* Type for passing arg must be consistent
5793 with that declared for the arg. */
5794 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
5796 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5797 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5799 /* Adjust argument to match prototype. E.g. a previous
5800 `int foo(float);' prototype causes
5801 `int foo(x) float x; {...}' to be treated like
5802 `int foo(float x) {...}'. This is particularly
5803 useful for argument types like uid_t. */
5804 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5805 #ifdef PROMOTE_PROTOTYPES
5806 if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
5807 && TYPE_PRECISION (TREE_TYPE (parm))
5808 < TYPE_PRECISION (integer_type_node))
5809 DECL_ARG_TYPE (parm) = integer_type_node;
5812 warning ("promoted argument `%s' doesn't match prototype",
5813 IDENTIFIER_POINTER (DECL_NAME (parm)));
5815 /* If -traditional, allow `int' argument to match
5816 `unsigned' prototype. */
5817 else if (! (flag_traditional
5818 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
5819 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
5820 error ("argument `%s' doesn't match prototype",
5821 IDENTIFIER_POINTER (DECL_NAME (parm)));
5824 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5827 /* Otherwise, create a prototype that would match. */
5831 register tree actual, type;
5832 register tree last = 0;
5834 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5836 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
5839 TREE_CHAIN (last) = type;
5844 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5846 TREE_CHAIN (last) = type;
5850 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5851 of the type of this function, but we need to avoid having this
5852 affect the types of other similarly-typed functions, so we must
5853 first force the generation of an identical (but separate) type
5854 node for the relevant function type. The new node we create
5855 will be a variant of the main variant of the original function
5858 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5860 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5863 /* Now store the final chain of decls for the arguments
5864 as the decl-chain of the current lexical scope.
5865 Put the enumerators in as well, at the front so that
5866 DECL_ARGUMENTS is not modified. */
5868 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
5871 /* Make sure the binding level for the top of the function body
5872 gets a BLOCK if there are any in the function.
5873 Otherwise, the dbx output is wrong. */
5875 keep_next_if_subblocks = 1;
5877 /* ??? This might be an improvement,
5878 but needs to be thought about some more. */
5880 keep_next_level_flag = 1;
5883 /* Write a record describing this function definition to the prototypes
5884 file (if requested). */
5886 gen_aux_info_record (fndecl, 1, 0, prototype);
5888 /* Initialize the RTL code for the function. */
5890 init_function_start (fndecl, input_filename, lineno);
5892 /* If this is a varargs function, inform function.c. */
5894 if (c_function_varargs)
5897 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
5899 declare_function_name ();
5901 /* Set up parameters and prepare for return, for the function. */
5903 expand_function_start (fndecl, 0);
5905 /* If this function is `main', emit a call to `__main'
5906 to run global initializers, etc. */
5907 if (DECL_NAME (fndecl)
5908 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
5909 && DECL_CONTEXT (fndecl) == NULL_TREE)
5910 expand_main_function ();
5913 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5914 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
5915 stands for an ellipsis in the identifier list.
5917 PARMLIST is the data returned by get_parm_info for the
5918 parmlist that follows the semicolon.
5920 We return a value of the same sort that get_parm_info returns,
5921 except that it describes the combination of identifiers and parmlist. */
5924 combine_parm_decls (specparms, parmlist, void_at_end)
5925 tree specparms, parmlist;
5928 register tree fndecl = current_function_decl;
5931 tree parmdecls = TREE_PURPOSE (parmlist);
5933 /* This is a chain of any other decls that came in among the parm
5934 declarations. They were separated already by get_parm_info,
5935 so we just need to keep them separate. */
5936 tree nonparms = TREE_VALUE (parmlist);
5940 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5941 DECL_RESULT (parm) = 0;
5943 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5945 register tree tail, found = NULL;
5947 /* See if any of the parmdecls specifies this parm by name. */
5948 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5949 if (DECL_NAME (tail) == TREE_VALUE (parm))
5955 /* If declaration already marked, we have a duplicate name.
5956 Complain, and don't use this decl twice. */
5957 if (found && DECL_RESULT (found) != 0)
5959 error_with_decl (found, "multiple parameters named `%s'");
5963 /* If the declaration says "void", complain and ignore it. */
5964 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5966 error_with_decl (found, "parameter `%s' declared void");
5967 TREE_TYPE (found) = integer_type_node;
5968 DECL_ARG_TYPE (found) = integer_type_node;
5969 layout_decl (found, 0);
5972 /* Traditionally, a parm declared float is actually a double. */
5973 if (found && flag_traditional
5974 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5975 TREE_TYPE (found) = double_type_node;
5977 /* If no declaration found, default to int. */
5980 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5982 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5983 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5984 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5985 error (found, "type of parameter `%s' is not declared");
5989 TREE_PURPOSE (parm) = found;
5991 /* Mark this decl as "already found" -- see test, above.
5992 It is safe to use DECL_RESULT for this
5993 since it is not used in PARM_DECLs or CONST_DECLs. */
5994 DECL_RESULT (found) = error_mark_node;
5997 /* Complain about any actual PARM_DECLs not matched with any names. */
5999 for (parm = parmdecls; parm; )
6001 tree next = TREE_CHAIN (parm);
6002 TREE_CHAIN (parm) = 0;
6004 /* Complain about args with incomplete types. */
6005 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6007 error_with_decl (parm, "parameter `%s' has incomplete type");
6008 TREE_TYPE (parm) = error_mark_node;
6011 if (DECL_RESULT (parm) == 0)
6013 error_with_decl (parm,
6014 "declaration for parameter `%s' but no such parameter");
6015 /* Pretend the parameter was not missing.
6016 This gets us to a standard state and minimizes
6017 further error messages. */
6019 = chainon (specparms,
6020 tree_cons (parm, NULL_TREE, NULL_TREE));
6026 /* Chain the declarations together in the order of the list of names.
6027 At the same time, build up a list of their types, in reverse order. */
6033 for (last = 0; parm; parm = TREE_CHAIN (parm))
6034 if (TREE_PURPOSE (parm))
6037 parmdecls = TREE_PURPOSE (parm);
6039 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6040 last = TREE_PURPOSE (parm);
6041 TREE_CHAIN (last) = 0;
6043 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6048 return saveable_tree_cons (parmdecls, nonparms,
6049 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6051 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6054 /* Finish up a function declaration and compile that function
6055 all the way to assembler language output. The free the storage
6056 for the function definition.
6058 This is called after parsing the body of the function definition.
6060 NESTED is nonzero if the function being finished is nested in another. */
6063 finish_function (nested)
6066 register tree fndecl = current_function_decl;
6068 /* TREE_READONLY (fndecl) = 1;
6069 This caused &foo to be of type ptr-to-const-function
6070 which then got a warning when stored in a ptr-to-function variable. */
6073 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6075 /* Must mark the RESULT_DECL as being in this function. */
6077 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6079 /* Obey `register' declarations if `setjmp' is called in this fn. */
6080 if (flag_traditional && current_function_calls_setjmp)
6082 setjmp_protect (DECL_INITIAL (fndecl));
6083 setjmp_protect_args ();
6086 #ifdef DEFAULT_MAIN_RETURN
6087 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6089 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6090 != integer_type_node)
6091 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6094 /* Make it so that `main' always returns success by default. */
6095 DEFAULT_MAIN_RETURN;
6100 /* Generate rtl for function exit. */
6101 expand_function_end (input_filename, lineno);
6103 /* So we can tell if jump_optimize sets it to 1. */
6106 /* Run the optimizers and output the assembler code for this function. */
6107 rest_of_compilation (fndecl);
6109 current_function_returns_null |= can_reach_end;
6111 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6112 warning ("`volatile' function does return");
6113 else if (warn_return_type && can_reach_end
6114 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6115 /* If this function returns non-void and control can drop through,
6117 warning ("control reaches end of non-void function");
6118 /* With just -W, complain only if function returns both with
6119 and without a value. */
6120 else if (extra_warnings
6121 && current_function_returns_value && current_function_returns_null)
6122 warning ("this function may return with or without a value");
6124 /* Free all the tree nodes making up this function. */
6125 /* Switch back to allocating nodes permanently
6126 until we start another function. */
6128 permanent_allocation ();
6130 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6132 /* Stop pointing to the local nodes about to be freed. */
6133 /* But DECL_INITIAL must remain nonzero so we know this
6134 was an actual function definition. */
6135 /* For a nested function, this is done in pop_c_function_context. */
6136 DECL_INITIAL (fndecl) = error_mark_node;
6137 DECL_ARGUMENTS (fndecl) = 0;
6142 /* Let the error reporting routines know that we're outside a
6143 function. For a nested function, this value is used in
6144 pop_c_function_context and then reset via pop_function_context. */
6145 current_function_decl = NULL;
6149 /* Save and restore the variables in this file and elsewhere
6150 that keep track of the progress of compilation of the current function.
6151 Used for nested functions. */
6155 struct c_function *next;
6156 tree enum_next_value;
6158 tree shadowed_labels;
6161 int warn_about_return_type;
6163 struct binding_level *binding_level;
6166 struct c_function *c_function_chain;
6168 /* Save and reinitialize the variables
6169 used during compilation of a C function. */
6172 push_c_function_context ()
6174 struct c_function *p
6175 = (struct c_function *) xmalloc (sizeof (struct c_function));
6178 pedwarn ("ANSI C forbids nested functions");
6180 push_function_context ();
6182 p->next = c_function_chain;
6183 c_function_chain = p;
6185 p->enum_next_value = enum_next_value;
6186 p->named_labels = named_labels;
6187 p->shadowed_labels = shadowed_labels;
6188 p->returns_value = current_function_returns_value;
6189 p->returns_null = current_function_returns_null;
6190 p->warn_about_return_type = warn_about_return_type;
6191 p->extern_inline = current_extern_inline;
6192 p->binding_level = current_binding_level;
6195 /* Restore the variables used during compilation of a C function. */
6198 pop_c_function_context ()
6200 struct c_function *p = c_function_chain;
6203 /* Bring back all the labels that were shadowed. */
6204 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6205 if (DECL_NAME (TREE_VALUE (link)) != 0)
6206 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6207 = TREE_VALUE (link);
6209 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6211 /* Stop pointing to the local nodes about to be freed. */
6212 /* But DECL_INITIAL must remain nonzero so we know this
6213 was an actual function definition. */
6214 DECL_INITIAL (current_function_decl) = error_mark_node;
6215 DECL_ARGUMENTS (current_function_decl) = 0;
6218 pop_function_context ();
6220 c_function_chain = p->next;
6222 enum_next_value = p->enum_next_value;
6223 named_labels = p->named_labels;
6224 shadowed_labels = p->shadowed_labels;
6225 current_function_returns_value = p->returns_value;
6226 current_function_returns_null = p->returns_null;
6227 warn_about_return_type = p->warn_about_return_type;
6228 current_extern_inline = p->extern_inline;
6229 current_binding_level = p->binding_level;