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 warn_uninitialized = 1;
655 warn_return_type = 1;
659 warn_char_subscripts = 1;
660 warn_parentheses = 1;
668 /* Hooks for print_node. */
681 print_lang_identifier (file, node, indent)
686 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
687 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
688 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
689 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
690 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
691 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
694 /* Create a new `struct binding_level'. */
697 struct binding_level *
698 make_binding_level ()
701 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
704 /* Nonzero if we are currently in the global binding level. */
709 return current_binding_level == global_binding_level;
715 keep_next_level_flag = 1;
718 /* Nonzero if the current level needs to have a BLOCK made. */
723 return ((current_binding_level->keep_if_subblocks
724 && current_binding_level->blocks != 0)
725 || current_binding_level->keep
726 || current_binding_level->names != 0
727 || (current_binding_level->tags != 0
728 && !current_binding_level->tag_transparent));
731 /* Identify this binding level as a level of parameters.
732 DEFINITION_FLAG is 1 for a definition, 0 for a declaration. */
735 declare_parm_level (definition_flag)
738 current_binding_level->parm_flag = 1 + definition_flag;
741 /* Nonzero if currently making parm declarations. */
746 return current_binding_level->parm_flag;
749 /* Enter a new binding level.
750 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
751 not for that of tags. */
754 pushlevel (tag_transparent)
757 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
759 /* If this is the top level of a function,
760 just make sure that NAMED_LABELS is 0. */
762 if (current_binding_level == global_binding_level)
767 /* Reuse or create a struct for this binding level. */
769 if (free_binding_level)
771 newlevel = free_binding_level;
772 free_binding_level = free_binding_level->level_chain;
776 newlevel = make_binding_level ();
779 /* Add this level to the front of the chain (stack) of levels that
782 *newlevel = clear_binding_level;
783 newlevel->tag_transparent
785 || (current_binding_level
786 ? current_binding_level->subblocks_tag_transparent
788 newlevel->level_chain = current_binding_level;
789 current_binding_level = newlevel;
790 newlevel->keep = keep_next_level_flag;
791 keep_next_level_flag = 0;
792 newlevel->keep_if_subblocks = keep_next_if_subblocks;
793 keep_next_if_subblocks = 0;
796 /* Exit a binding level.
797 Pop the level off, and restore the state of the identifier-decl mappings
798 that were in effect when this level was entered.
800 If KEEP is nonzero, this level had explicit declarations, so
801 and create a "block" (a BLOCK node) for the level
802 to record its declarations and subblocks for symbol table output.
804 If FUNCTIONBODY is nonzero, this level is the body of a function,
805 so create a block as if KEEP were set and also clear out all
808 If REVERSE is nonzero, reverse the order of decls before putting
809 them into the BLOCK. */
812 poplevel (keep, reverse, functionbody)
818 /* The chain of decls was accumulated in reverse order.
819 Put it into forward order, just for cleanliness. */
821 tree tags = current_binding_level->tags;
822 tree subblocks = current_binding_level->blocks;
825 int block_previously_created;
827 keep |= current_binding_level->keep;
829 /* This warning is turned off because it causes warnings for
830 declarations like `extern struct foo *x'. */
832 /* Warn about incomplete structure types in this level. */
833 for (link = tags; link; link = TREE_CHAIN (link))
834 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
836 tree type = TREE_VALUE (link);
838 switch (TREE_CODE (type))
841 errmsg = "`struct %s' incomplete in scope ending here";
844 errmsg = "`union %s' incomplete in scope ending here";
847 errmsg = "`enum %s' incomplete in scope ending here";
850 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
851 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
853 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
854 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
858 /* Get the decls in the order they were written.
859 Usually current_binding_level->names is in reverse order.
860 But parameter decls were previously put in forward order. */
863 current_binding_level->names
864 = decls = nreverse (current_binding_level->names);
866 decls = current_binding_level->names;
868 /* Output any nested inline functions within this block
869 if they weren't already output. */
871 for (decl = decls; decl; decl = TREE_CHAIN (decl))
872 if (TREE_CODE (decl) == FUNCTION_DECL
873 && ! TREE_ASM_WRITTEN (decl)
874 && DECL_INITIAL (decl) != 0
875 && TREE_ADDRESSABLE (decl))
877 /* If this decl was copied from a file-scope decl
878 on account of a block-scope extern decl,
879 propagate TREE_ADDRESSABLE to the file-scope decl. */
880 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
881 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
883 output_inline_function (decl);
886 /* If there were any declarations or structure tags in that level,
887 or if this level is a function body,
888 create a BLOCK to record them for the life of this function. */
891 block_previously_created = (current_binding_level->this_block != 0);
892 if (block_previously_created)
893 block = current_binding_level->this_block;
894 else if (keep || functionbody
895 || (current_binding_level->keep_if_subblocks && subblocks != 0))
896 block = make_node (BLOCK);
899 BLOCK_VARS (block) = decls;
900 BLOCK_TYPE_TAGS (block) = tags;
901 BLOCK_SUBBLOCKS (block) = subblocks;
902 remember_end_note (block);
905 /* In each subblock, record that this is its superior. */
907 for (link = subblocks; link; link = TREE_CHAIN (link))
908 BLOCK_SUPERCONTEXT (link) = block;
910 /* Clear out the meanings of the local variables of this level. */
912 for (link = decls; link; link = TREE_CHAIN (link))
914 if (DECL_NAME (link) != 0)
916 /* If the ident. was used or addressed via a local extern decl,
917 don't forget that fact. */
918 if (DECL_EXTERNAL (link))
920 if (TREE_USED (link))
921 TREE_USED (DECL_NAME (link)) = 1;
922 if (TREE_ADDRESSABLE (link))
923 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
925 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
929 /* Restore all name-meanings of the outer levels
930 that were shadowed by this level. */
932 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
933 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
935 /* If the level being exited is the top level of a function,
936 check over all the labels, and clear out the current
937 (function local) meanings of their names. */
941 /* If this is the top level block of a function,
942 the vars are the function's parameters.
943 Don't leave them in the BLOCK because they are
944 found in the FUNCTION_DECL instead. */
946 BLOCK_VARS (block) = 0;
948 /* Clear out the definitions of all label names,
949 since their scopes end here,
950 and add them to BLOCK_VARS. */
952 for (link = named_labels; link; link = TREE_CHAIN (link))
954 register tree label = TREE_VALUE (link);
956 if (DECL_INITIAL (label) == 0)
958 error_with_decl (label, "label `%s' used but not defined");
959 /* Avoid crashing later. */
960 define_label (input_filename, lineno,
963 else if (warn_unused && !TREE_USED (label))
964 warning_with_decl (label, "label `%s' defined but not used");
965 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
967 /* Put the labels into the "variables" of the
968 top-level block, so debugger can see them. */
969 TREE_CHAIN (label) = BLOCK_VARS (block);
970 BLOCK_VARS (block) = label;
974 /* Pop the current level, and free the structure for reuse. */
977 register struct binding_level *level = current_binding_level;
978 current_binding_level = current_binding_level->level_chain;
980 level->level_chain = free_binding_level;
981 free_binding_level = level;
984 /* Dispose of the block that we just made inside some higher level. */
986 DECL_INITIAL (current_function_decl) = block;
989 if (!block_previously_created)
990 current_binding_level->blocks
991 = chainon (current_binding_level->blocks, block);
993 /* If we did not make a block for the level just exited,
994 any blocks made for inner levels
995 (since they cannot be recorded as subblocks in that level)
996 must be carried forward so they will later become subblocks
997 of something else. */
999 current_binding_level->blocks
1000 = chainon (current_binding_level->blocks, subblocks);
1002 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1003 binding contour so that they point to the appropriate construct, i.e.
1004 either to the current FUNCTION_DECL node, or else to the BLOCK node
1005 we just constructed.
1007 Note that for tagged types whose scope is just the formal parameter
1008 list for some function type specification, we can't properly set
1009 their TYPE_CONTEXTs here, because we don't have a pointer to the
1010 appropriate FUNCTION_TYPE node readily available to us. For those
1011 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1012 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1013 node which will represent the "scope" for these "parameter list local"
1018 for (link = tags; link; link = TREE_CHAIN (link))
1019 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1021 for (link = tags; link; link = TREE_CHAIN (link))
1022 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1025 TREE_USED (block) = 1;
1029 /* Delete the node BLOCK from the current binding level.
1030 This is used for the block inside a stmt expr ({...})
1031 so that the block can be reinserted where appropriate. */
1034 delete_block (block)
1038 if (current_binding_level->blocks == block)
1039 current_binding_level->blocks = TREE_CHAIN (block);
1040 for (t = current_binding_level->blocks; t;)
1042 if (TREE_CHAIN (t) == block)
1043 TREE_CHAIN (t) = TREE_CHAIN (block);
1047 TREE_CHAIN (block) = NULL;
1048 /* Clear TREE_USED which is always set by poplevel.
1049 The flag is set again if insert_block is called. */
1050 TREE_USED (block) = 0;
1053 /* Insert BLOCK at the end of the list of subblocks of the
1054 current binding level. This is used when a BIND_EXPR is expanded,
1055 to handle the BLOCK node inside teh BIND_EXPR. */
1058 insert_block (block)
1061 TREE_USED (block) = 1;
1062 current_binding_level->blocks
1063 = chainon (current_binding_level->blocks, block);
1066 /* Set the BLOCK node for the innermost scope
1067 (the one we are currently in). */
1071 register tree block;
1073 current_binding_level->this_block = block;
1079 register struct binding_level *newlevel;
1081 /* Reuse or create a struct for this binding level. */
1083 if (free_binding_level)
1085 newlevel = free_binding_level;
1086 free_binding_level = free_binding_level->level_chain;
1090 newlevel = make_binding_level ();
1093 /* Add this level to the front of the chain (stack) of label levels. */
1095 newlevel->level_chain = label_level_chain;
1096 label_level_chain = newlevel;
1098 newlevel->names = named_labels;
1099 newlevel->shadowed = shadowed_labels;
1101 shadowed_labels = 0;
1107 register struct binding_level *level = label_level_chain;
1110 /* Clear out the definitions of the declared labels in this level.
1111 Leave in the list any ordinary, non-declared labels. */
1112 for (link = named_labels, prev = 0; link;)
1114 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1116 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1118 error_with_decl ("label `%s' used but not defined",
1120 /* Avoid crashing later. */
1121 define_label (input_filename, lineno,
1122 DECL_NAME (TREE_VALUE (link)));
1124 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1125 warning_with_decl (TREE_VALUE (link),
1126 "label `%s' defined but not used");
1127 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1129 /* Delete this element from the list. */
1130 link = TREE_CHAIN (link);
1132 TREE_CHAIN (prev) = link;
1134 named_labels = link;
1139 link = TREE_CHAIN (link);
1143 /* Bring back all the labels that were shadowed. */
1144 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1145 if (DECL_NAME (TREE_VALUE (link)) != 0)
1146 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1147 = TREE_VALUE (link);
1149 named_labels = chainon (named_labels, level->names);
1150 shadowed_labels = level->shadowed;
1152 /* Pop the current level, and free the structure for reuse. */
1153 label_level_chain = label_level_chain->level_chain;
1154 level->level_chain = free_binding_level;
1155 free_binding_level = level;
1158 /* Push a definition or a declaration of struct, union or enum tag "name".
1159 "type" should be the type node.
1160 We assume that the tag "name" is not already defined.
1162 Note that the definition may really be just a forward reference.
1163 In that case, the TYPE_SIZE will be zero. */
1166 pushtag (name, type)
1169 register struct binding_level *b;
1171 /* Find the proper binding level for this type tag. */
1173 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1178 /* Record the identifier as the type's name if it has none. */
1180 if (TYPE_NAME (type) == 0)
1181 TYPE_NAME (type) = name;
1184 if (b == global_binding_level)
1185 b->tags = perm_tree_cons (name, type, b->tags);
1187 b->tags = saveable_tree_cons (name, type, b->tags);
1189 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1190 tagged type we just added to the current binding level. This fake
1191 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1192 to output a representation of a tagged type, and it also gives
1193 us a convenient place to record the "scope start" address for the
1196 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1199 /* Handle when a new declaration NEWDECL
1200 has the same name as an old one OLDDECL
1201 in the same binding contour.
1202 Prints an error message if appropriate.
1204 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1205 Otherwise, return 0. */
1208 duplicate_decls (newdecl, olddecl)
1209 register tree newdecl, olddecl;
1211 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1212 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1213 && DECL_INITIAL (newdecl) != 0);
1214 tree oldtype = TREE_TYPE (olddecl);
1215 tree newtype = TREE_TYPE (newdecl);
1217 if (TREE_CODE (newtype) == ERROR_MARK
1218 || TREE_CODE (oldtype) == ERROR_MARK)
1221 /* New decl is completely inconsistent with the old one =>
1222 tell caller to replace the old one.
1223 This is always an error except in the case of shadowing a builtin. */
1224 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1226 if (TREE_CODE (olddecl) == FUNCTION_DECL
1227 && DECL_BUILT_IN (olddecl))
1229 /* If you declare a built-in function name as static, the
1230 built-in definition is overridden,
1231 but optionally warn this was a bad choice of name. */
1232 if (!TREE_PUBLIC (newdecl))
1235 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1237 /* Likewise, if the built-in is not ansi, then programs can
1238 override it even globally without an error. */
1239 else if (DECL_BUILT_IN_NONANSI (olddecl))
1240 warning_with_decl (newdecl,
1241 "built-in function `%s' declared as non-function");
1243 error_with_decl (newdecl,
1244 "built-in function `%s' declared as non-function");
1246 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1247 && DECL_BUILT_IN_NONANSI (olddecl))
1249 /* If overriding decl is static,
1250 optionally warn this was a bad choice of name. */
1251 if (!TREE_PUBLIC (newdecl))
1254 warning_with_decl (newdecl, "shadowing library function `%s'");
1256 /* Otherwise, always warn. */
1258 warning_with_decl (newdecl,
1259 "library function `%s' declared as non-function");
1263 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1264 error_with_decl (olddecl, "previous declaration of `%s'");
1270 /* For real parm decl following a forward decl,
1271 return 1 so old decl will be reused. */
1272 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1273 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1276 /* The new declaration is the same kind of object as the old one.
1277 The declarations may partially match. Print warnings if they don't
1278 match enough. Ultimately, copy most of the information from the new
1279 decl to the old one, and keep using the old one. */
1281 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1282 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1283 && DECL_INITIAL (olddecl) == 0)
1284 /* If -traditional, avoid error for redeclaring fcn
1285 after implicit decl. */
1287 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1288 && DECL_BUILT_IN (olddecl))
1290 /* A function declaration for a built-in function. */
1291 if (!TREE_PUBLIC (newdecl))
1293 /* If you declare a built-in function name as static, the
1294 built-in definition is overridden,
1295 but optionally warn this was a bad choice of name. */
1297 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1298 /* Discard the old built-in function. */
1301 else if (!types_match)
1303 /* Accept the return type of the new declaration if same modes. */
1304 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1305 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1306 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1308 /* Function types may be shared, so we can't just modify
1309 the return type of olddecl's function type. */
1311 = build_function_type (newreturntype,
1312 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1314 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1316 TREE_TYPE (olddecl) = newtype;
1321 /* If types don't match for a built-in, throw away the built-in. */
1322 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1326 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1327 && DECL_SOURCE_LINE (olddecl) == 0)
1329 /* A function declaration for a predeclared function
1330 that isn't actually built in. */
1331 if (!TREE_PUBLIC (newdecl))
1333 /* If you declare it as static, the
1334 default definition is overridden. */
1337 else if (!types_match)
1339 /* If the types don't match, preserve volatility indication.
1340 Later on, we will discard everything else about the
1341 default declaration. */
1342 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1345 /* Permit char *foo () to match void *foo (...) if not pedantic,
1346 if one of them came from a system header file. */
1347 else if (!types_match
1348 && TREE_CODE (olddecl) == FUNCTION_DECL
1349 && TREE_CODE (newdecl) == FUNCTION_DECL
1350 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1351 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1352 && (DECL_IN_SYSTEM_HEADER (olddecl)
1353 || DECL_IN_SYSTEM_HEADER (newdecl))
1354 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1355 && TYPE_ARG_TYPES (oldtype) == 0
1356 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1357 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1359 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1360 && TYPE_ARG_TYPES (newtype) == 0
1361 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1362 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1365 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1366 /* Make sure we keep void * as ret type, not char *. */
1367 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1368 TREE_TYPE (newdecl) = newtype = oldtype;
1370 else if (!types_match
1371 /* Permit char *foo (int, ...); followed by char *foo ();
1373 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1375 /* Return types must still match. */
1376 && comptypes (TREE_TYPE (oldtype),
1377 TREE_TYPE (newtype))
1378 && TYPE_ARG_TYPES (newtype) == 0))
1380 error_with_decl (newdecl, "conflicting types for `%s'");
1381 /* Check for function type mismatch
1382 involving an empty arglist vs a nonempty one. */
1383 if (TREE_CODE (olddecl) == FUNCTION_DECL
1384 && comptypes (TREE_TYPE (oldtype),
1385 TREE_TYPE (newtype))
1386 && ((TYPE_ARG_TYPES (oldtype) == 0
1387 && DECL_INITIAL (olddecl) == 0)
1389 (TYPE_ARG_TYPES (newtype) == 0
1390 && DECL_INITIAL (newdecl) == 0)))
1392 /* Classify the problem further. */
1393 register tree t = TYPE_ARG_TYPES (oldtype);
1395 t = TYPE_ARG_TYPES (newtype);
1396 for (; t; t = TREE_CHAIN (t))
1398 register tree type = TREE_VALUE (t);
1400 if (TREE_CHAIN (t) == 0
1401 && TYPE_MAIN_VARIANT (type) != void_type_node)
1403 error ("A parameter list with an ellipsis can't match");
1404 error ("an empty parameter name list declaration.");
1408 if (TYPE_MAIN_VARIANT (type) == float_type_node
1409 || C_PROMOTING_INTEGER_TYPE_P (type))
1411 error ("An argument type that has a default promotion");
1412 error ("can't match an empty parameter name list declaration.");
1417 error_with_decl (olddecl, "previous declaration of `%s'");
1421 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1424 error_with_decl (newdecl, errmsg);
1425 error_with_decl (olddecl,
1426 ((DECL_INITIAL (olddecl)
1427 && current_binding_level == global_binding_level)
1428 ? "`%s' previously defined here"
1429 : "`%s' previously declared here"));
1431 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1432 && DECL_INITIAL (olddecl) != 0
1433 && TYPE_ARG_TYPES (oldtype) == 0
1434 && TYPE_ARG_TYPES (newtype) != 0)
1436 register tree type, parm;
1438 /* Prototype decl follows defn w/o prototype. */
1440 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1441 type = TYPE_ARG_TYPES (newtype),
1443 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1444 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1445 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1447 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1448 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1450 errmsg = "prototype for `%s' follows and number of arguments";
1453 /* Type for passing arg must be consistent
1454 with that declared for the arg. */
1455 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1456 /* If -traditional, allow `unsigned int' instead of `int'
1457 in the prototype. */
1458 && (! (flag_traditional
1459 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1460 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1462 errmsg = "prototype for `%s' follows and argument %d";
1468 error_with_decl (newdecl, errmsg, nargs);
1469 error_with_decl (olddecl,
1470 "doesn't match non-prototype definition here");
1474 warning_with_decl (newdecl, "prototype for `%s' follows");
1475 warning_with_decl (olddecl, "non-prototype definition here");
1478 /* Warn about mismatches in various flags. */
1481 /* Warn if function is now inline
1482 but was previously declared not inline and has been called. */
1483 if (TREE_CODE (olddecl) == FUNCTION_DECL
1484 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1485 && TREE_USED (olddecl))
1486 warning_with_decl (newdecl,
1487 "`%s' declared inline after being called");
1488 if (TREE_CODE (olddecl) == FUNCTION_DECL
1489 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1490 && DECL_INITIAL (olddecl) != 0)
1491 warning_with_decl (newdecl,
1492 "`%s' declared inline after its definition");
1493 /* It is nice to warn when a function is declared
1494 global first and then static. */
1495 if (TREE_CODE (olddecl) == FUNCTION_DECL
1496 && TREE_PUBLIC (olddecl)
1497 && !TREE_PUBLIC (newdecl))
1498 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1500 /* These bits are logically part of the type, for variables.
1501 But not for functions
1502 (where qualifiers are not valid ANSI anyway). */
1503 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1504 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1505 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1506 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1510 /* Optionally warn about more than one declaration for the same name. */
1511 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1512 /* Dont warn about a function declaration
1513 followed by a definition. */
1514 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1515 && DECL_INITIAL (olddecl) == 0))
1517 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1518 warning_with_decl (olddecl, "previous declaration of `%s'");
1521 /* Copy all the DECL_... slots specified in the new decl
1522 except for any that we copy here from the old type.
1524 Past this point, we don't change OLDTYPE and NEWTYPE
1525 even if we change the types of NEWDECL and OLDDECL. */
1529 /* Merge the data types specified in the two decls. */
1530 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1532 = TREE_TYPE (olddecl)
1533 = common_type (newtype, oldtype);
1535 /* Lay the type out, unless already done. */
1536 if (oldtype != TREE_TYPE (newdecl))
1538 if (TREE_TYPE (newdecl) != error_mark_node)
1539 layout_type (TREE_TYPE (newdecl));
1540 if (TREE_CODE (newdecl) != FUNCTION_DECL
1541 && TREE_CODE (newdecl) != TYPE_DECL
1542 && TREE_CODE (newdecl) != CONST_DECL)
1543 layout_decl (newdecl, 0);
1547 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1548 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1549 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1550 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1551 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1554 /* Keep the old rtl since we can safely use it. */
1555 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1557 /* Merge the type qualifiers. */
1558 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1559 && !TREE_THIS_VOLATILE (newdecl))
1560 TREE_THIS_VOLATILE (olddecl) = 0;
1561 if (TREE_READONLY (newdecl))
1562 TREE_READONLY (olddecl) = 1;
1563 if (TREE_THIS_VOLATILE (newdecl))
1565 TREE_THIS_VOLATILE (olddecl) = 1;
1566 if (TREE_CODE (newdecl) == VAR_DECL)
1567 make_var_volatile (newdecl);
1570 /* Keep source location of definition rather than declaration. */
1571 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1573 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1574 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1577 /* Merge the unused-warning information. */
1578 if (DECL_IN_SYSTEM_HEADER (olddecl))
1579 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1580 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1581 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1583 /* Merge the initialization information. */
1584 if (DECL_INITIAL (newdecl) == 0)
1585 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1587 /* If cannot merge, then use the new type and qualifiers,
1588 and don't preserve the old rtl. */
1591 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1592 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1593 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1594 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1597 /* Merge the storage class information. */
1598 /* For functions, static overrides non-static. */
1599 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1601 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1602 /* This is since we don't automatically
1603 copy the attributes of NEWDECL into OLDDECL. */
1604 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1605 /* If this clears `static', clear it in the identifier too. */
1606 if (! TREE_PUBLIC (olddecl))
1607 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1609 if (DECL_EXTERNAL (newdecl))
1611 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1612 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1613 /* An extern decl does not override previous storage class. */
1614 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1618 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1619 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1622 /* If either decl says `inline', this fn is inline,
1623 unless its definition was passed already. */
1624 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1625 DECL_INLINE (olddecl) = 1;
1626 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1628 /* Get rid of any built-in function if new arg types don't match it
1629 or if we have a function definition. */
1630 if (TREE_CODE (newdecl) == FUNCTION_DECL
1631 && DECL_BUILT_IN (olddecl)
1632 && (!types_match || new_is_definition))
1634 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1635 DECL_BUILT_IN (olddecl) = 0;
1638 /* If redeclaring a builtin function, and not a definition,
1640 Also preserve various other info from the definition. */
1641 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1643 if (DECL_BUILT_IN (olddecl))
1645 DECL_BUILT_IN (newdecl) = 1;
1646 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1649 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1651 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1652 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1653 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1654 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1657 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1658 But preserve OLDdECL's DECL_UID. */
1660 register unsigned olddecl_uid = DECL_UID (olddecl);
1662 bcopy ((char *) newdecl + sizeof (struct tree_common),
1663 (char *) olddecl + sizeof (struct tree_common),
1664 sizeof (struct tree_decl) - sizeof (struct tree_common));
1665 DECL_UID (olddecl) = olddecl_uid;
1671 /* Record a decl-node X as belonging to the current lexical scope.
1672 Check for errors (such as an incompatible declaration for the same
1673 name already seen in the same scope).
1675 Returns either X or an old decl for the same name.
1676 If an old decl is returned, it may have been smashed
1677 to agree with what X says. */
1684 register tree name = DECL_NAME (x);
1685 register struct binding_level *b = current_binding_level;
1687 DECL_CONTEXT (x) = current_function_decl;
1688 /* A local declaration for a function doesn't constitute nesting. */
1689 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0)
1690 DECL_CONTEXT (x) = 0;
1692 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1693 && x != IDENTIFIER_IMPLICIT_DECL (name))
1694 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1701 t = lookup_name_current_level (name);
1702 if (t != 0 && t == error_mark_node)
1703 /* error_mark_node is 0 for a while during initialization! */
1706 error_with_decl (x, "`%s' used prior to declaration");
1711 file = DECL_SOURCE_FILE (t);
1712 line = DECL_SOURCE_LINE (t);
1715 if (t != 0 && duplicate_decls (x, t))
1717 if (TREE_CODE (t) == PARM_DECL)
1719 /* Don't allow more than one "real" duplicate
1720 of a forward parm decl. */
1721 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1724 /* If this decl is `static' and an implicit decl was seen previously,
1725 warn. But don't complain if -traditional,
1726 since traditional compilers don't complain. */
1727 if (!flag_traditional && TREE_PUBLIC (name)
1728 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1729 /* We used to warn also for explicit extern followed by static,
1730 but sometimes you need to do it that way. */
1731 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1733 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1734 IDENTIFIER_POINTER (name));
1735 pedwarn_with_file_and_line (file, line,
1736 "previous declaration of `%s'",
1737 IDENTIFIER_POINTER (name));
1743 /* If we are processing a typedef statement, generate a whole new
1744 ..._TYPE node (which will be just an variant of the existing
1745 ..._TYPE node with identical properties) and then install the
1746 TYPE_DECL node generated to represent the typedef name as the
1747 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1749 The whole point here is to end up with a situation where each
1750 and every ..._TYPE node the compiler creates will be uniquely
1751 associated with AT MOST one node representing a typedef name.
1752 This way, even though the compiler substitutes corresponding
1753 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1754 early on, later parts of the compiler can always do the reverse
1755 translation and get back the corresponding typedef name. For
1758 typedef struct S MY_TYPE;
1761 Later parts of the compiler might only know that `object' was of
1762 type `struct S' if if were not for code just below. With this
1763 code however, later parts of the compiler see something like:
1765 struct S' == struct S
1766 typedef struct S' MY_TYPE;
1769 And they can then deduce (from the node for type struct S') that
1770 the original object declaration was:
1774 Being able to do this is important for proper support of protoize,
1775 and also for generating precise symbolic debugging information
1776 which takes full account of the programmer's (typedef) vocabulary.
1778 Obviously, we don't want to generate a duplicate ..._TYPE node if
1779 the TYPE_DECL node that we are now processing really represents a
1780 standard built-in type.
1782 Since all standard types are effectively declared at line zero
1783 in the source file, we can easily check to see if we are working
1784 on a standard type by checking the current value of lineno. */
1786 if (TREE_CODE (x) == TYPE_DECL)
1788 if (DECL_SOURCE_LINE (x) == 0)
1790 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1791 TYPE_NAME (TREE_TYPE (x)) = x;
1795 tree tt = TREE_TYPE (x);
1797 tt = build_type_copy (tt);
1803 /* Multiple external decls of the same identifier ought to match.
1804 Check against both global declarations and out of scope (limbo) block
1807 We get warnings about inline functions where they are defined.
1808 Avoid duplicate warnings where they are used. */
1809 if ((DECL_EXTERNAL (x) || TREE_PUBLIC (x)) && ! DECL_INLINE (x))
1813 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1814 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1815 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1816 decl = IDENTIFIER_GLOBAL_VALUE (name);
1817 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1818 /* Decls in limbo are always extern, so no need to check that. */
1819 decl = IDENTIFIER_LIMBO_VALUE (name);
1823 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1824 /* If old decl is built-in, we already warned if we should. */
1825 && !DECL_BUILT_IN (decl))
1827 pedwarn_with_decl (x,
1828 "type mismatch with previous external decl");
1829 pedwarn_with_decl (decl, "previous external decl of `%s'");
1833 /* If a function has had an implicit declaration, and then is defined,
1834 make sure they are compatible. */
1836 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1837 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1838 && TREE_CODE (x) == FUNCTION_DECL
1839 && ! comptypes (TREE_TYPE (x),
1840 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1842 warning_with_decl (x, "type mismatch with previous implicit declaration");
1843 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1844 "previous implicit declaration of `%s'");
1847 /* In PCC-compatibility mode, extern decls of vars with no current decl
1848 take effect at top level no matter where they are. */
1849 if (flag_traditional && DECL_EXTERNAL (x)
1850 && lookup_name (name) == 0)
1852 tree type = TREE_TYPE (x);
1854 /* But don't do this if the type contains temporary nodes. */
1857 if (type == error_mark_node)
1859 if (! TREE_PERMANENT (type))
1861 warning_with_decl (x, "type of external `%s' is not global");
1862 /* By exiting the loop early, we leave TYPE nonzero,
1863 and thus prevent globalization of the decl. */
1866 else if (TREE_CODE (type) == FUNCTION_TYPE
1867 && TYPE_ARG_TYPES (type) != 0)
1868 /* The types might not be truly local,
1869 but the list of arg types certainly is temporary.
1870 Since prototypes are nontraditional,
1871 ok not to do the traditional thing. */
1873 type = TREE_TYPE (type);
1877 b = global_binding_level;
1880 /* This name is new in its binding level.
1881 Install the new declaration and return it. */
1882 if (b == global_binding_level)
1884 /* Install a global value. */
1886 /* If the first global decl has external linkage,
1887 warn if we later see static one. */
1888 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1889 TREE_PUBLIC (name) = 1;
1891 IDENTIFIER_GLOBAL_VALUE (name) = x;
1893 /* We no longer care about any previous block level declarations. */
1894 IDENTIFIER_LIMBO_VALUE (name) = 0;
1896 /* Don't forget if the function was used via an implicit decl. */
1897 if (IDENTIFIER_IMPLICIT_DECL (name)
1898 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1899 TREE_USED (x) = 1, TREE_USED (name) = 1;
1901 /* Don't forget if its address was taken in that way. */
1902 if (IDENTIFIER_IMPLICIT_DECL (name)
1903 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1904 TREE_ADDRESSABLE (x) = 1;
1906 /* Warn about mismatches against previous implicit decl. */
1907 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1908 /* If this real decl matches the implicit, don't complain. */
1909 && ! (TREE_CODE (x) == FUNCTION_DECL
1910 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1911 == integer_type_node)))
1912 pedwarn ("`%s' was previously implicitly declared to return `int'",
1913 IDENTIFIER_POINTER (name));
1915 /* If this decl is `static' and an `extern' was seen previously,
1916 that is erroneous. */
1917 if (TREE_PUBLIC (name)
1918 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1920 /* Okay to redeclare an ANSI built-in as static. */
1921 if (t != 0 && DECL_BUILT_IN (t))
1923 /* Okay to declare a non-ANSI built-in as anything. */
1924 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1926 else if (IDENTIFIER_IMPLICIT_DECL (name))
1927 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1928 IDENTIFIER_POINTER (name));
1930 pedwarn ("`%s' was declared `extern' and later `static'",
1931 IDENTIFIER_POINTER (name));
1936 /* Here to install a non-global value. */
1937 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
1938 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
1939 IDENTIFIER_LOCAL_VALUE (name) = x;
1941 /* If this is an extern function declaration, see if we
1942 have a global definition or declaration for the function. */
1944 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
1946 && TREE_CODE (x) == FUNCTION_DECL
1947 && TREE_CODE (oldglobal) == FUNCTION_DECL)
1949 /* We have one. Their types must agree. */
1950 if (! comptypes (TREE_TYPE (x),
1951 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
1952 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
1955 /* Inner extern decl is inline if global one is.
1956 Copy enough to really inline it. */
1957 if (DECL_INLINE (oldglobal))
1959 DECL_INLINE (x) = DECL_INLINE (oldglobal);
1960 DECL_INITIAL (x) = (current_function_decl == oldglobal
1961 ? 0 : DECL_INITIAL (oldglobal));
1962 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
1963 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
1964 DECL_RESULT (x) = DECL_RESULT (oldglobal);
1965 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
1966 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
1968 /* Inner extern decl is built-in if global one is. */
1969 if (DECL_BUILT_IN (oldglobal))
1971 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
1972 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
1974 /* Keep the arg types from a file-scope fcn defn. */
1975 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
1976 && DECL_INITIAL (oldglobal)
1977 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
1978 TREE_TYPE (x) = TREE_TYPE (oldglobal);
1982 #if 0 /* This case is probably sometimes the right thing to do. */
1983 /* If we have a local external declaration,
1984 then any file-scope declaration should not
1985 have been static. */
1986 if (oldlocal == 0 && oldglobal != 0
1987 && !TREE_PUBLIC (oldglobal)
1988 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1989 warning ("`%s' locally external but globally static",
1990 IDENTIFIER_POINTER (name));
1993 /* If we have a local external declaration,
1994 and no file-scope declaration has yet been seen,
1995 then if we later have a file-scope decl it must not be static. */
1998 && DECL_EXTERNAL (x)
2001 TREE_PUBLIC (name) = 1;
2003 /* Save this decl, so that we can do type checking against
2004 other decls after it falls out of scope.
2006 Only save it once. This prevents temporary decls created in
2007 expand_inline_function from being used here, since this
2008 will have been set when the inline function was parsed.
2009 It also helps give slightly better warnings. */
2010 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2011 IDENTIFIER_LIMBO_VALUE (name) = x;
2014 /* Warn if shadowing an argument at the top level of the body. */
2015 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2016 /* This warning doesn't apply to the parms of a nested fcn. */
2017 && ! current_binding_level->parm_flag
2018 /* Check that this is one level down from the parms. */
2019 && current_binding_level->level_chain->parm_flag
2020 /* Check that the decl being shadowed
2021 comes from the parm level, one level up. */
2022 && chain_member (oldlocal, current_binding_level->level_chain->names))
2024 if (TREE_CODE (oldlocal) == PARM_DECL)
2025 pedwarn ("declaration of `%s' shadows a parameter",
2026 IDENTIFIER_POINTER (name));
2028 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2029 IDENTIFIER_POINTER (name));
2032 /* Maybe warn if shadowing something else. */
2033 else if (warn_shadow && !DECL_EXTERNAL (x)
2034 /* No shadow warnings for internally generated vars. */
2035 && DECL_SOURCE_LINE (x) != 0
2036 /* No shadow warnings for vars made for inlining. */
2037 && ! DECL_FROM_INLINE (x))
2039 char *warnstring = 0;
2041 if (TREE_CODE (x) == PARM_DECL
2042 && current_binding_level->parm_flag == 1)
2043 /* Don't warn about the parm names in a declaration. */
2045 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2046 warnstring = "declaration of `%s' shadows a parameter";
2047 else if (oldlocal != 0)
2048 warnstring = "declaration of `%s' shadows previous local";
2049 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2050 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2051 warnstring = "declaration of `%s' shadows global declaration";
2054 warning (warnstring, IDENTIFIER_POINTER (name));
2057 /* If storing a local value, there may already be one (inherited).
2058 If so, record it for restoration when this binding level ends. */
2060 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2063 /* Keep count of variables in this level with incomplete type. */
2064 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2068 /* Put decls on list in reverse order.
2069 We will reverse them later if necessary. */
2070 TREE_CHAIN (x) = b->names;
2076 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2079 pushdecl_top_level (x)
2083 register struct binding_level *b = current_binding_level;
2085 current_binding_level = global_binding_level;
2087 current_binding_level = b;
2091 /* Generate an implicit declaration for identifier FUNCTIONID
2092 as a function of type int (). Print a warning if appropriate. */
2095 implicitly_declare (functionid)
2099 int traditional_warning = 0;
2100 /* Only one "implicit declaration" warning per identifier. */
2101 int implicit_warning;
2103 /* Save the decl permanently so we can warn if definition follows. */
2104 push_obstacks_nochange ();
2105 end_temporary_allocation ();
2107 /* We used to reuse an old implicit decl here,
2108 but this loses with inline functions because it can clobber
2109 the saved decl chains. */
2110 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2111 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2113 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2115 /* Warn of implicit decl following explicit local extern decl.
2116 This is probably a program designed for traditional C. */
2117 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2118 traditional_warning = 1;
2120 /* Warn once of an implicit declaration. */
2121 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2123 DECL_EXTERNAL (decl) = 1;
2124 TREE_PUBLIC (decl) = 1;
2126 /* Record that we have an implicit decl and this is it. */
2127 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2129 /* ANSI standard says implicit declarations are in the innermost block.
2130 So we record the decl in the standard fashion.
2131 If flag_traditional is set, pushdecl does it top-level. */
2134 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2135 maybe_objc_check_decl (decl);
2137 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2139 if (warn_implicit && implicit_warning)
2140 warning ("implicit declaration of function `%s'",
2141 IDENTIFIER_POINTER (functionid));
2142 else if (warn_traditional && traditional_warning)
2143 warning ("function `%s' was previously declared within a block",
2144 IDENTIFIER_POINTER (functionid));
2146 /* Write a record describing this implicit function declaration to the
2147 prototypes file (if requested). */
2149 gen_aux_info_record (decl, 0, 1, 0);
2156 /* Return zero if the declaration NEWDECL is valid
2157 when the declaration OLDDECL (assumed to be for the same name)
2158 has already been seen.
2159 Otherwise return an error message format string with a %s
2160 where the identifier should go. */
2163 redeclaration_error_message (newdecl, olddecl)
2164 tree newdecl, olddecl;
2166 if (TREE_CODE (newdecl) == TYPE_DECL)
2168 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2170 return "redefinition of `%s'";
2172 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2174 /* Declarations of functions can insist on internal linkage
2175 but they can't be inconsistent with internal linkage,
2176 so there can be no error on that account.
2177 However defining the same name twice is no good. */
2178 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2179 /* However, defining once as extern inline and a second
2180 time in another way is ok. */
2181 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2182 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2183 return "redefinition of `%s'";
2186 else if (current_binding_level == global_binding_level)
2188 /* Objects declared at top level: */
2189 /* If at least one is a reference, it's ok. */
2190 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2192 /* Reject two definitions. */
2193 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2194 return "redefinition of `%s'";
2195 /* Now we have two tentative defs, or one tentative and one real def. */
2196 /* Insist that the linkage match. */
2197 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2198 return "conflicting declarations of `%s'";
2201 else if (current_binding_level->parm_flag
2202 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2206 /* Objects declared with block scope: */
2207 /* Reject two definitions, and reject a definition
2208 together with an external reference. */
2209 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2210 return "redeclaration of `%s'";
2215 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2216 Create one if none exists so far for the current function.
2217 This function is called for both label definitions and label references. */
2223 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2225 /* Use a label already defined or ref'd with this name. */
2228 /* But not if it is inherited and wasn't declared to be inheritable. */
2229 if (DECL_CONTEXT (decl) != current_function_decl
2230 && ! C_DECLARED_LABEL_FLAG (decl))
2231 return shadow_label (id);
2235 decl = build_decl (LABEL_DECL, id, void_type_node);
2237 /* Make sure every label has an rtx. */
2240 /* A label not explicitly declared must be local to where it's ref'd. */
2241 DECL_CONTEXT (decl) = current_function_decl;
2243 DECL_MODE (decl) = VOIDmode;
2245 /* Say where one reference is to the label,
2246 for the sake of the error if it is not defined. */
2247 DECL_SOURCE_LINE (decl) = lineno;
2248 DECL_SOURCE_FILE (decl) = input_filename;
2250 IDENTIFIER_LABEL_VALUE (id) = decl;
2252 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2257 /* Make a label named NAME in the current function,
2258 shadowing silently any that may be inherited from containing functions
2259 or containing scopes.
2261 Note that valid use, if the label being shadowed
2262 comes from another scope in the same function,
2263 requires calling declare_nonlocal_label right away. */
2269 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2273 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2274 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2277 return lookup_label (name);
2280 /* Define a label, specifying the location in the source file.
2281 Return the LABEL_DECL node for the label, if the definition is valid.
2282 Otherwise return 0. */
2285 define_label (filename, line, name)
2290 tree decl = lookup_label (name);
2292 /* If label with this name is known from an outer context, shadow it. */
2293 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2295 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2296 IDENTIFIER_LABEL_VALUE (name) = 0;
2297 decl = lookup_label (name);
2300 if (DECL_INITIAL (decl) != 0)
2302 error_with_decl (decl, "duplicate label `%s'");
2307 /* Mark label as having been defined. */
2308 DECL_INITIAL (decl) = error_mark_node;
2309 /* Say where in the source. */
2310 DECL_SOURCE_FILE (decl) = filename;
2311 DECL_SOURCE_LINE (decl) = line;
2316 /* Return the list of declarations of the current level.
2317 Note that this list is in reverse order unless/until
2318 you nreverse it; and when you do nreverse it, you must
2319 store the result back using `storedecls' or you will lose. */
2324 return current_binding_level->names;
2327 /* Return the list of type-tags (for structs, etc) of the current level. */
2332 return current_binding_level->tags;
2335 /* Store the list of declarations of the current level.
2336 This is done for the parameter declarations of a function being defined,
2337 after they are modified in the light of any missing parameters. */
2343 current_binding_level->names = decls;
2346 /* Similarly, store the list of tags of the current level. */
2352 current_binding_level->tags = tags;
2355 /* Given NAME, an IDENTIFIER_NODE,
2356 return the structure (or union or enum) definition for that name.
2357 Searches binding levels from BINDING_LEVEL up to the global level.
2358 If THISLEVEL_ONLY is nonzero, searches only the specified context
2359 (but skips any tag-transparent contexts to find one that is
2360 meaningful for tags).
2361 CODE says which kind of type the caller wants;
2362 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2363 If the wrong kind of type is found, an error is reported. */
2366 lookup_tag (code, name, binding_level, thislevel_only)
2367 enum tree_code code;
2368 struct binding_level *binding_level;
2372 register struct binding_level *level;
2374 for (level = binding_level; level; level = level->level_chain)
2377 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2379 if (TREE_PURPOSE (tail) == name)
2381 if (TREE_CODE (TREE_VALUE (tail)) != code)
2383 /* Definition isn't the kind we were looking for. */
2384 pending_invalid_xref = name;
2385 pending_invalid_xref_file = input_filename;
2386 pending_invalid_xref_line = lineno;
2388 return TREE_VALUE (tail);
2391 if (thislevel_only && ! level->tag_transparent)
2397 /* Print an error message now
2398 for a recent invalid struct, union or enum cross reference.
2399 We don't print them immediately because they are not invalid
2400 when used in the `struct foo;' construct for shadowing. */
2403 pending_xref_error ()
2405 if (pending_invalid_xref != 0)
2406 error_with_file_and_line (pending_invalid_xref_file,
2407 pending_invalid_xref_line,
2408 "`%s' defined as wrong kind of tag",
2409 IDENTIFIER_POINTER (pending_invalid_xref));
2410 pending_invalid_xref = 0;
2413 /* Given a type, find the tag that was defined for it and return the tag name.
2414 Otherwise return 0. */
2417 lookup_tag_reverse (type)
2420 register struct binding_level *level;
2422 for (level = current_binding_level; level; level = level->level_chain)
2425 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2427 if (TREE_VALUE (tail) == type)
2428 return TREE_PURPOSE (tail);
2434 /* Look up NAME in the current binding level and its superiors
2435 in the namespace of variables, functions and typedefs.
2436 Return a ..._DECL node of some kind representing its definition,
2437 or return 0 if it is undefined. */
2444 if (current_binding_level != global_binding_level
2445 && IDENTIFIER_LOCAL_VALUE (name))
2446 val = IDENTIFIER_LOCAL_VALUE (name);
2448 val = IDENTIFIER_GLOBAL_VALUE (name);
2452 /* Similar to `lookup_name' but look only at current binding level. */
2455 lookup_name_current_level (name)
2460 if (current_binding_level == global_binding_level)
2461 return IDENTIFIER_GLOBAL_VALUE (name);
2463 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2466 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2467 if (DECL_NAME (t) == name)
2473 /* Create the predefined scalar types of C,
2474 and some nodes representing standard constants (0, 1, (void *)0).
2475 Initialize the global binding level.
2476 Make definitions for built-in primitive functions. */
2479 init_decl_processing ()
2481 register tree endlink;
2482 /* Either char* or void*. */
2483 tree traditional_ptr_type_node;
2484 /* Data types of memcpy and strlen. */
2485 tree memcpy_ftype, strlen_ftype;
2486 tree void_ftype_any;
2487 int wchar_type_size;
2490 current_function_decl = NULL;
2491 named_labels = NULL;
2492 current_binding_level = NULL_BINDING_LEVEL;
2493 free_binding_level = NULL_BINDING_LEVEL;
2494 pushlevel (0); /* make the binding_level structure for global names */
2495 global_binding_level = current_binding_level;
2497 /* Define `int' and `char' first so that dbx will output them first. */
2499 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2500 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2501 integer_type_node));
2503 /* Define `char', which is like either `signed char' or `unsigned char'
2504 but not the same as either. */
2508 ? make_signed_type (CHAR_TYPE_SIZE)
2509 : make_unsigned_type (CHAR_TYPE_SIZE));
2510 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2513 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2514 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2515 long_integer_type_node));
2517 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2518 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2519 unsigned_type_node));
2521 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2522 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2523 long_unsigned_type_node));
2525 /* `unsigned long' is the standard type for sizeof.
2526 Traditionally, use a signed type.
2527 Note that stddef.h uses `unsigned long',
2528 and this must agree, even of long and int are the same size. */
2529 if (flag_traditional)
2530 sizetype = long_integer_type_node;
2533 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2536 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2538 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2539 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2540 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2541 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2542 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2544 error_mark_node = make_node (ERROR_MARK);
2545 TREE_TYPE (error_mark_node) = error_mark_node;
2547 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2548 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2549 short_integer_type_node));
2551 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2552 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2553 long_long_integer_type_node));
2555 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2556 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2557 short_unsigned_type_node));
2559 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2560 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2561 long_long_unsigned_type_node));
2563 /* Define both `signed char' and `unsigned char'. */
2564 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2565 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2566 signed_char_type_node));
2568 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2569 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2570 unsigned_char_type_node));
2572 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2573 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2575 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2576 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2578 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2579 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2581 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2582 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2584 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2585 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2587 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2588 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2590 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2591 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2593 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2594 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2596 float_type_node = make_node (REAL_TYPE);
2597 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2598 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2600 layout_type (float_type_node);
2602 double_type_node = make_node (REAL_TYPE);
2603 if (flag_short_double)
2604 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2606 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2607 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2609 layout_type (double_type_node);
2611 long_double_type_node = make_node (REAL_TYPE);
2612 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2613 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2614 long_double_type_node));
2615 layout_type (long_double_type_node);
2618 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2619 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2620 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2621 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2623 integer_zero_node = build_int_2 (0, 0);
2624 TREE_TYPE (integer_zero_node) = integer_type_node;
2625 integer_one_node = build_int_2 (1, 0);
2626 TREE_TYPE (integer_one_node) = integer_type_node;
2628 size_zero_node = build_int_2 (0, 0);
2629 TREE_TYPE (size_zero_node) = sizetype;
2630 size_one_node = build_int_2 (1, 0);
2631 TREE_TYPE (size_one_node) = sizetype;
2633 void_type_node = make_node (VOID_TYPE);
2634 pushdecl (build_decl (TYPE_DECL,
2635 ridpointers[(int) RID_VOID], void_type_node));
2636 layout_type (void_type_node); /* Uses integer_zero_node */
2637 /* We are not going to have real types in C with less than byte alignment,
2638 so we might as well not have any types that claim to have it. */
2639 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2641 null_pointer_node = build_int_2 (0, 0);
2642 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2643 layout_type (TREE_TYPE (null_pointer_node));
2645 string_type_node = build_pointer_type (char_type_node);
2646 const_string_type_node
2647 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2649 /* make a type for arrays of 256 characters.
2650 256 is picked randomly because we have a type for integers from 0 to 255.
2651 With luck nothing will ever really depend on the length of this
2653 char_array_type_node
2654 = build_array_type (char_type_node, unsigned_intQI_type_node);
2655 /* Likewise for arrays of ints. */
2657 = build_array_type (integer_type_node, unsigned_intQI_type_node);
2658 /* This is for wide string constants. */
2659 wchar_array_type_node
2660 = build_array_type (wchar_type_node, unsigned_intQI_type_node);
2662 default_function_type
2663 = build_function_type (integer_type_node, NULL_TREE);
2665 ptr_type_node = build_pointer_type (void_type_node);
2667 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2669 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2672 = build_function_type (void_type_node, NULL_TREE);
2675 = build_function_type (double_type_node,
2676 tree_cons (NULL_TREE, double_type_node, endlink));
2678 double_ftype_double_double
2679 = build_function_type (double_type_node,
2680 tree_cons (NULL_TREE, double_type_node,
2681 tree_cons (NULL_TREE,
2682 double_type_node, endlink)));
2685 = build_function_type (integer_type_node,
2686 tree_cons (NULL_TREE, integer_type_node, endlink));
2689 = build_function_type (long_integer_type_node,
2690 tree_cons (NULL_TREE,
2691 long_integer_type_node, endlink));
2693 void_ftype_ptr_ptr_int
2694 = build_function_type (void_type_node,
2695 tree_cons (NULL_TREE, ptr_type_node,
2696 tree_cons (NULL_TREE, ptr_type_node,
2697 tree_cons (NULL_TREE,
2701 int_ftype_cptr_cptr_sizet
2702 = build_function_type (integer_type_node,
2703 tree_cons (NULL_TREE, const_ptr_type_node,
2704 tree_cons (NULL_TREE, const_ptr_type_node,
2705 tree_cons (NULL_TREE,
2709 void_ftype_ptr_int_int
2710 = build_function_type (void_type_node,
2711 tree_cons (NULL_TREE, ptr_type_node,
2712 tree_cons (NULL_TREE, integer_type_node,
2713 tree_cons (NULL_TREE,
2717 string_ftype_ptr_ptr /* strcpy prototype */
2718 = build_function_type (string_type_node,
2719 tree_cons (NULL_TREE, string_type_node,
2720 tree_cons (NULL_TREE,
2721 const_string_type_node,
2724 int_ftype_string_string /* strcmp prototype */
2725 = build_function_type (integer_type_node,
2726 tree_cons (NULL_TREE, const_string_type_node,
2727 tree_cons (NULL_TREE,
2728 const_string_type_node,
2731 strlen_ftype /* strlen prototype */
2732 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2733 tree_cons (NULL_TREE, const_string_type_node,
2736 traditional_ptr_type_node
2737 = (flag_traditional ? string_type_node : ptr_type_node);
2739 memcpy_ftype /* memcpy prototype */
2740 = build_function_type (traditional_ptr_type_node,
2741 tree_cons (NULL_TREE, ptr_type_node,
2742 tree_cons (NULL_TREE, const_ptr_type_node,
2743 tree_cons (NULL_TREE,
2747 builtin_function ("__builtin_constant_p", int_ftype_int,
2748 BUILT_IN_CONSTANT_P, NULL_PTR);
2750 builtin_function ("__builtin_return_address",
2751 build_function_type (ptr_type_node,
2752 tree_cons (NULL_TREE,
2755 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2757 builtin_function ("__builtin_frame_address",
2758 build_function_type (ptr_type_node,
2759 tree_cons (NULL_TREE,
2762 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2764 builtin_function ("__builtin_alloca",
2765 build_function_type (ptr_type_node,
2766 tree_cons (NULL_TREE,
2769 BUILT_IN_ALLOCA, "alloca");
2770 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2771 /* Define alloca, ffs as builtins.
2772 Declare _exit just to mark it as volatile. */
2773 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2775 temp = builtin_function ("alloca",
2776 build_function_type (ptr_type_node,
2777 tree_cons (NULL_TREE,
2780 BUILT_IN_ALLOCA, NULL_PTR);
2781 /* Suppress error if redefined as a non-function. */
2782 DECL_BUILT_IN_NONANSI (temp) = 1;
2783 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2784 /* Suppress error if redefined as a non-function. */
2785 DECL_BUILT_IN_NONANSI (temp) = 1;
2786 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2788 TREE_THIS_VOLATILE (temp) = 1;
2789 TREE_SIDE_EFFECTS (temp) = 1;
2790 /* Suppress error if redefined as a non-function. */
2791 DECL_BUILT_IN_NONANSI (temp) = 1;
2794 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2795 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2797 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2799 builtin_function ("__builtin_saveregs",
2800 build_function_type (ptr_type_node, NULL_TREE),
2801 BUILT_IN_SAVEREGS, NULL_PTR);
2802 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2804 builtin_function ("__builtin_varargs",
2805 build_function_type (ptr_type_node,
2806 tree_cons (NULL_TREE,
2809 BUILT_IN_VARARGS, NULL_PTR);
2811 builtin_function ("__builtin_classify_type", default_function_type,
2812 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2813 builtin_function ("__builtin_next_arg",
2814 build_function_type (ptr_type_node, endlink),
2815 BUILT_IN_NEXT_ARG, NULL_PTR);
2816 builtin_function ("__builtin_args_info",
2817 build_function_type (integer_type_node,
2818 tree_cons (NULL_TREE,
2821 BUILT_IN_ARGS_INFO, NULL_PTR);
2823 /* Currently under experimentation. */
2824 builtin_function ("__builtin_memcpy", memcpy_ftype,
2825 BUILT_IN_MEMCPY, "memcpy");
2826 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2827 BUILT_IN_MEMCMP, "memcmp");
2828 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2829 BUILT_IN_STRCMP, "strcmp");
2830 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2831 BUILT_IN_STRCPY, "strcpy");
2832 builtin_function ("__builtin_strlen", strlen_ftype,
2833 BUILT_IN_STRLEN, "strlen");
2834 builtin_function ("__builtin_fsqrt", double_ftype_double,
2835 BUILT_IN_FSQRT, "sqrt");
2836 builtin_function ("__builtin_sin", double_ftype_double,
2837 BUILT_IN_SIN, "sin");
2838 builtin_function ("__builtin_cos", double_ftype_double,
2839 BUILT_IN_COS, "cos");
2841 /* In an ANSI C program, it is okay to supply built-in meanings
2842 for these functions, since applications cannot validly use them
2843 with any other meaning.
2844 However, honor the -fno-builtin option. */
2845 if (!flag_no_builtin)
2847 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2848 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
2849 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
2850 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
2851 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
2853 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
2855 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
2857 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
2858 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
2859 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
2860 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
2862 /* Declare these functions volatile
2863 to avoid spurious "control drops through" warnings. */
2864 /* Don't specify the argument types, to avoid errors
2865 from certain code which isn't valid in ANSI but which exists. */
2866 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
2868 TREE_THIS_VOLATILE (temp) = 1;
2869 TREE_SIDE_EFFECTS (temp) = 1;
2870 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
2871 TREE_THIS_VOLATILE (temp) = 1;
2872 TREE_SIDE_EFFECTS (temp) = 1;
2876 /* Support for these has not been written in either expand_builtin
2877 or build_function_call. */
2878 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
2879 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
2880 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
2882 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
2884 builtin_function ("__builtin_fmod", double_ftype_double_double,
2885 BUILT_IN_FMOD, NULL_PTR);
2886 builtin_function ("__builtin_frem", double_ftype_double_double,
2887 BUILT_IN_FREM, NULL_PTR);
2888 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
2889 BUILT_IN_MEMSET, NULL_PTR);
2890 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
2892 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
2896 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
2897 declare_function_name ();
2899 start_identifier_warnings ();
2901 init_format_info_table ();
2904 /* Return a definition for a builtin function named NAME and whose data type
2905 is TYPE. TYPE should be a function type with argument types.
2906 FUNCTION_CODE tells later passes how to compile calls to this function.
2907 See tree.h for its possible values.
2909 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2910 the name to be called if we can't opencode the function. */
2913 builtin_function (name, type, function_code, library_name)
2916 enum built_in_function function_code;
2919 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2920 DECL_EXTERNAL (decl) = 1;
2921 TREE_PUBLIC (decl) = 1;
2922 /* If -traditional, permit redefining a builtin function any way you like.
2923 (Though really, if the program redefines these functions,
2924 it probably won't work right unless compiled with -fno-builtin.) */
2925 if (flag_traditional && name[0] != '_')
2926 DECL_BUILT_IN_NONANSI (decl) = 1;
2928 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
2929 make_decl_rtl (decl, NULL_PTR, 1);
2931 if (function_code != NOT_BUILT_IN)
2933 DECL_BUILT_IN (decl) = 1;
2934 DECL_SET_FUNCTION_CODE (decl, function_code);
2936 /* Warn if a function in the namespace for users
2937 is used without an occasion to consider it declared. */
2938 if (name[0] != '_' || name[1] != '_')
2939 C_DECL_ANTICIPATED (decl) = 1;
2944 /* Called when a declaration is seen that contains no names to declare.
2945 If its type is a reference to a structure, union or enum inherited
2946 from a containing scope, shadow that tag name for the current scope
2947 with a forward reference.
2948 If its type defines a new named structure or union
2949 or defines an enum, it is valid but we need not do anything here.
2950 Otherwise, it is an error. */
2953 shadow_tag (declspecs)
2956 shadow_tag_warned (declspecs, 0);
2960 shadow_tag_warned (declspecs, warned)
2967 pending_invalid_xref = 0;
2969 for (link = declspecs; link; link = TREE_CHAIN (link))
2971 register tree value = TREE_VALUE (link);
2972 register enum tree_code code = TREE_CODE (value);
2974 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2975 /* Used to test also that TYPE_SIZE (value) != 0.
2976 That caused warning for `struct foo;' at top level in the file. */
2978 register tree name = lookup_tag_reverse (value);
2985 if (!warned && code != ENUMERAL_TYPE) /* Empty unnamed enum OK */
2987 pedwarn ("unnamed struct/union that defines no instances");
2993 t = lookup_tag (code, name, current_binding_level, 1);
2997 t = make_node (code);
3005 pedwarn ("useless keyword or type name in empty declaration");
3013 error ("two types specified in one empty declaration");
3015 pedwarn ("empty declaration");
3019 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3022 groktypename (typename)
3025 if (TREE_CODE (typename) != TREE_LIST)
3027 return grokdeclarator (TREE_VALUE (typename),
3028 TREE_PURPOSE (typename),
3032 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3035 groktypename_in_parm_context (typename)
3038 if (TREE_CODE (typename) != TREE_LIST)
3040 return grokdeclarator (TREE_VALUE (typename),
3041 TREE_PURPOSE (typename),
3045 /* Decode a declarator in an ordinary declaration or data definition.
3046 This is called as soon as the type information and variable name
3047 have been parsed, before parsing the initializer if any.
3048 Here we create the ..._DECL node, fill in its type,
3049 and put it on the list of decls for the current context.
3050 The ..._DECL node is returned as the value.
3052 Exception: for arrays where the length is not specified,
3053 the type is left null, to be filled in by `finish_decl'.
3055 Function definitions do not come here; they go to start_function
3056 instead. However, external and forward declarations of functions
3057 do go through here. Structure field declarations are done by
3058 grokfield and not through here. */
3060 /* Set this to zero to debug not using the temporary obstack
3061 to parse initializers. */
3062 int debug_temp_inits = 1;
3065 start_decl (declarator, declspecs, initialized)
3066 tree declarator, declspecs;
3069 register tree decl = grokdeclarator (declarator, declspecs,
3070 NORMAL, initialized);
3072 int init_written = initialized;
3074 /* The corresponding pop_obstacks is in finish_decl. */
3075 push_obstacks_nochange ();
3078 /* Is it valid for this decl to have an initializer at all?
3079 If not, set INITIALIZED to zero, which will indirectly
3080 tell `finish_decl' to ignore the initializer once it is parsed. */
3081 switch (TREE_CODE (decl))
3084 /* typedef foo = bar means give foo the same type as bar.
3085 We haven't parsed bar yet, so `finish_decl' will fix that up.
3086 Any other case of an initialization in a TYPE_DECL is an error. */
3087 if (pedantic || list_length (declspecs) > 1)
3089 error ("typedef `%s' is initialized",
3090 IDENTIFIER_POINTER (DECL_NAME (decl)));
3096 error ("function `%s' is initialized like a variable",
3097 IDENTIFIER_POINTER (DECL_NAME (decl)));
3102 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3103 error ("parameter `%s' is initialized",
3104 IDENTIFIER_POINTER (DECL_NAME (decl)));
3109 /* Don't allow initializations for incomplete types
3110 except for arrays which might be completed by the initialization. */
3111 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3113 /* A complete type is ok if size is fixed. */
3115 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3116 || C_DECL_VARIABLE_SIZE (decl))
3118 error ("variable-sized object may not be initialized");
3122 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3124 error ("variable `%s' has initializer but incomplete type",
3125 IDENTIFIER_POINTER (DECL_NAME (decl)));
3128 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3130 error ("elements of array `%s' have incomplete type",
3131 IDENTIFIER_POINTER (DECL_NAME (decl)));
3138 #if 0 /* Seems redundant with grokdeclarator. */
3139 if (current_binding_level != global_binding_level
3140 && DECL_EXTERNAL (decl)
3141 && TREE_CODE (decl) != FUNCTION_DECL)
3142 warning ("declaration of `%s' has `extern' and is initialized",
3143 IDENTIFIER_POINTER (DECL_NAME (decl)));
3145 DECL_EXTERNAL (decl) = 0;
3146 if (current_binding_level == global_binding_level)
3147 TREE_STATIC (decl) = 1;
3149 /* Tell `pushdecl' this is an initialized decl
3150 even though we don't yet have the initializer expression.
3151 Also tell `finish_decl' it may store the real initializer. */
3152 DECL_INITIAL (decl) = error_mark_node;
3155 /* If this is a function declaration, write a record describing it to the
3156 prototypes file (if requested). */
3158 if (TREE_CODE (decl) == FUNCTION_DECL)
3159 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3161 /* Add this decl to the current binding level.
3162 TEM may equal DECL or it may be a previous decl of the same name. */
3163 tem = pushdecl (decl);
3165 /* For a local variable, define the RTL now. */
3166 if (current_binding_level != global_binding_level
3167 /* But not if this is a duplicate decl
3168 and we preserved the rtl from the previous one
3169 (which may or may not happen). */
3170 && DECL_RTL (tem) == 0)
3172 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3174 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3175 && DECL_INITIAL (tem) != 0)
3181 /* When parsing and digesting the initializer,
3182 use temporary storage. Do this even if we will ignore the value. */
3183 if (current_binding_level == global_binding_level && debug_temp_inits)
3184 temporary_allocation ();
3190 /* Finish processing of a declaration;
3191 install its initial value.
3192 If the length of an array type is not known before,
3193 it must be determined now, from the initial value, or it is an error. */
3196 finish_decl (decl, init, asmspec_tree)
3200 register tree type = TREE_TYPE (decl);
3201 int was_incomplete = (DECL_SIZE (decl) == 0);
3202 int temporary = allocation_temporary_p ();
3206 asmspec = TREE_STRING_POINTER (asmspec_tree);
3208 /* If `start_decl' didn't like having an initialization, ignore it now. */
3210 if (init != 0 && DECL_INITIAL (decl) == 0)
3212 /* Don't crash if parm is initialized. */
3213 if (TREE_CODE (decl) == PARM_DECL)
3218 if (TREE_CODE (decl) != TYPE_DECL)
3219 store_init_value (decl, init);
3222 /* typedef foo = bar; store the type of bar as the type of foo. */
3223 TREE_TYPE (decl) = TREE_TYPE (init);
3224 DECL_INITIAL (decl) = init = 0;
3228 /* Pop back to the obstack that is current for this binding level.
3229 This is because MAXINDEX, rtl, etc. to be made below
3230 must go in the permanent obstack. But don't discard the
3231 temporary data yet. */
3233 #if 0 /* pop_obstacks was near the end; this is what was here. */
3234 if (current_binding_level == global_binding_level && temporary)
3235 end_temporary_allocation ();
3238 /* Deduce size of array from initialization, if not already known */
3240 if (TREE_CODE (type) == ARRAY_TYPE
3241 && TYPE_DOMAIN (type) == 0
3242 && TREE_CODE (decl) != TYPE_DECL)
3245 = (TREE_STATIC (decl)
3246 /* Even if pedantic, an external linkage array
3247 may have incomplete type at first. */
3248 ? pedantic && !TREE_PUBLIC (decl)
3249 : !DECL_EXTERNAL (decl));
3251 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3253 /* Get the completed type made by complete_array_type. */
3254 type = TREE_TYPE (decl);
3257 error_with_decl (decl, "initializer fails to determine size of `%s'");
3262 error_with_decl (decl, "array size missing in `%s'");
3263 else if (!pedantic && TREE_STATIC (decl))
3264 DECL_EXTERNAL (decl) = 1;
3267 if (pedantic && TYPE_DOMAIN (type) != 0
3268 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3270 error_with_decl (decl, "zero-size array `%s'");
3272 layout_decl (decl, 0);
3275 if (TREE_CODE (decl) == VAR_DECL)
3277 if (DECL_SIZE (decl) == 0
3278 && (TREE_STATIC (decl)
3280 /* A static variable with an incomplete type
3281 is an error if it is initialized or `static'.
3282 Otherwise, let it through, but if it is not `extern'
3283 then it may cause an error message later. */
3284 !TREE_PUBLIC (decl) || DECL_INITIAL (decl)
3286 /* An automatic variable with an incomplete type
3288 !DECL_EXTERNAL (decl)))
3290 error_with_decl (decl, "storage size of `%s' isn't known");
3291 TREE_TYPE (decl) = error_mark_node;
3294 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3295 && DECL_SIZE (decl) != 0
3296 && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
3297 error_with_decl (decl, "storage size of `%s' isn't constant");
3300 /* Output the assembler code and/or RTL code for variables and functions,
3301 unless the type is an undefined structure or union.
3302 If not, it will get done when the type is completed. */
3304 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3306 if (flag_traditional && allocation_temporary_p ())
3308 push_obstacks_nochange ();
3309 end_temporary_allocation ();
3310 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3311 maybe_objc_check_decl (decl);
3312 rest_of_decl_compilation (decl, asmspec,
3313 current_binding_level == global_binding_level,
3319 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3320 maybe_objc_check_decl (decl);
3321 rest_of_decl_compilation (decl, asmspec,
3322 current_binding_level == global_binding_level,
3325 if (current_binding_level != global_binding_level)
3327 /* Recompute the RTL of a local array now
3328 if it used to be an incomplete type. */
3330 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3332 /* If we used it already as memory, it must stay in memory. */
3333 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3334 /* If it's still incomplete now, no init will save it. */
3335 if (DECL_SIZE (decl) == 0)
3336 DECL_INITIAL (decl) = 0;
3339 /* Compute and store the initial value. */
3340 if (TREE_CODE (decl) != FUNCTION_DECL)
3341 expand_decl_init (decl);
3345 if (TREE_CODE (decl) == TYPE_DECL)
3347 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3348 maybe_objc_check_decl (decl);
3349 rest_of_decl_compilation (decl, NULL_PTR,
3350 current_binding_level == global_binding_level,
3354 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3355 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3356 && temporary && TREE_PERMANENT (decl))
3358 /* We need to remember that this array HAD an initialization,
3359 but discard the actual temporary nodes,
3360 since we can't have a permanent node keep pointing to them. */
3361 /* We make an exception for inline functions, since it's
3362 normal for a local extern redeclaration of an inline function
3363 to have a copy of the top-level decl's DECL_INLINE. */
3364 if (DECL_INITIAL (decl) != 0)
3365 DECL_INITIAL (decl) = error_mark_node;
3369 /* Resume permanent allocation, if not within a function. */
3370 /* The corresponding push_obstacks_nochange is in start_decl,
3371 and in push_parm_decl and in grokfield. */
3375 /* If we have gone back from temporary to permanent allocation,
3376 actually free the temporary space that we no longer need. */
3377 if (temporary && !allocation_temporary_p ())
3378 permanent_allocation ();
3380 /* At the end of a declaration, throw away any variable type sizes
3381 of types defined inside that declaration. There is no use
3382 computing them in the following function definition. */
3383 if (current_binding_level == global_binding_level)
3384 get_pending_sizes ();
3387 /* If DECL has a cleanup, build and return that cleanup here.
3388 This is a callback called by expand_expr. */
3391 maybe_build_cleanup (decl)
3394 /* There are no cleanups in C. */
3398 /* Given a parsed parameter declaration,
3399 decode it into a PARM_DECL and push that on the current binding level.
3400 Also, for the sake of forward parm decls,
3401 record the given order of parms in `parm_order'. */
3404 push_parm_decl (parm)
3408 int old_immediate_size_expand = immediate_size_expand;
3409 /* Don't try computing parm sizes now -- wait till fn is called. */
3410 immediate_size_expand = 0;
3412 /* The corresponding pop_obstacks is in finish_decl. */
3413 push_obstacks_nochange ();
3415 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3416 if (DECL_NAME (decl))
3418 olddecl = lookup_name (DECL_NAME (decl));
3419 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3420 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3422 decl = pushdecl (decl);
3424 immediate_size_expand = old_immediate_size_expand;
3426 current_binding_level->parm_order
3427 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3429 /* Add this decl to the current binding level. */
3430 finish_decl (decl, NULL_TREE, NULL_TREE);
3433 /* Clear the given order of parms in `parm_order'.
3434 Used at start of parm list,
3435 and also at semicolon terminating forward decls. */
3440 current_binding_level->parm_order = NULL_TREE;
3443 /* Make TYPE a complete type based on INITIAL_VALUE.
3444 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3445 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3448 complete_array_type (type, initial_value, do_default)
3453 register tree maxindex = NULL_TREE;
3458 /* Note MAXINDEX is really the maximum index,
3459 one less than the size. */
3460 if (TREE_CODE (initial_value) == STRING_CST)
3463 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3464 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3466 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3469 = list_length (CONSTRUCTOR_ELTS (initial_value));
3470 maxindex = build_int_2 (nelts - 1, 0);
3474 /* Make an error message unless that happened already. */
3475 if (initial_value != error_mark_node)
3478 /* Prevent further error messages. */
3479 maxindex = build_int_2 (1, 0);
3486 maxindex = build_int_2 (1, 0);
3492 TYPE_DOMAIN (type) = build_index_type (maxindex);
3493 if (!TREE_TYPE (maxindex))
3494 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3497 /* Lay out the type now that we can get the real answer. */
3504 /* Given declspecs and a declarator,
3505 determine the name and type of the object declared
3506 and construct a ..._DECL node for it.
3507 (In one case we can return a ..._TYPE node instead.
3508 For invalid input we sometimes return 0.)
3510 DECLSPECS is a chain of tree_list nodes whose value fields
3511 are the storage classes and type specifiers.
3513 DECL_CONTEXT says which syntactic context this declaration is in:
3514 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3515 FUNCDEF for a function definition. Like NORMAL but a few different
3516 error messages in each case. Return value may be zero meaning
3517 this definition is too screwy to try to parse.
3518 PARM for a parameter declaration (either within a function prototype
3519 or before a function body). Make a PARM_DECL, or return void_type_node.
3520 TYPENAME if for a typename (in a cast or sizeof).
3521 Don't make a DECL node; just return the ..._TYPE node.
3522 FIELD for a struct or union field; make a FIELD_DECL.
3523 BITFIELD for a field with specified width.
3524 INITIALIZED is 1 if the decl has an initializer.
3526 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3527 It may also be so in the PARM case, for a prototype where the
3528 argument type is specified but not the name.
3530 This function is where the complicated C meanings of `static'
3531 and `extern' are interpreted. */
3534 grokdeclarator (declarator, declspecs, decl_context, initialized)
3537 enum decl_context decl_context;
3542 tree type = NULL_TREE;
3547 int explicit_int = 0;
3548 int explicit_char = 0;
3549 tree typedef_decl = 0;
3551 tree typedef_type = 0;
3552 int funcdef_flag = 0;
3553 enum tree_code innermost_code = ERROR_MARK;
3555 int size_varies = 0;
3557 if (decl_context == BITFIELD)
3558 bitfield = 1, decl_context = FIELD;
3560 if (decl_context == FUNCDEF)
3561 funcdef_flag = 1, decl_context = NORMAL;
3563 push_obstacks_nochange ();
3565 if (flag_traditional && allocation_temporary_p ())
3566 end_temporary_allocation ();
3568 /* Look inside a declarator for the name being declared
3569 and get it as a string, for an error message. */
3571 register tree decl = declarator;
3575 switch (TREE_CODE (decl))
3580 innermost_code = TREE_CODE (decl);
3581 decl = TREE_OPERAND (decl, 0);
3584 case IDENTIFIER_NODE:
3585 name = IDENTIFIER_POINTER (decl);
3596 /* A function definition's declarator must have the form of
3597 a function declarator. */
3599 if (funcdef_flag && innermost_code != CALL_EXPR)
3602 /* Anything declared one level down from the top level
3603 must be one of the parameters of a function
3604 (because the body is at least two levels down). */
3606 /* If this looks like a function definition, make it one,
3607 even if it occurs where parms are expected.
3608 Then store_parm_decls will reject it and not use it as a parm. */
3609 if (decl_context == NORMAL && !funcdef_flag
3610 && current_binding_level->level_chain == global_binding_level)
3611 decl_context = PARM;
3613 /* Look through the decl specs and record which ones appear.
3614 Some typespecs are defined as built-in typenames.
3615 Others, the ones that are modifiers of other types,
3616 are represented by bits in SPECBITS: set the bits for
3617 the modifiers that appear. Storage class keywords are also in SPECBITS.
3619 If there is a typedef name or a type, store the type in TYPE.
3620 This includes builtin typedefs such as `int'.
3622 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3623 and did not come from a user typedef.
3625 Set LONGLONG if `long' is mentioned twice. */
3627 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3630 register tree id = TREE_VALUE (spec);
3632 if (id == ridpointers[(int) RID_INT])
3634 if (id == ridpointers[(int) RID_CHAR])
3637 if (TREE_CODE (id) == IDENTIFIER_NODE)
3638 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3640 if (ridpointers[i] == id)
3642 if (i == (int) RID_LONG && specbits & (1<<i))
3645 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3647 error ("`long long long' is too long for GCC");
3651 else if (specbits & (1 << i))
3652 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3658 error ("two or more data types in declaration of `%s'", name);
3659 /* Actual typedefs come to us as TYPE_DECL nodes. */
3660 else if (TREE_CODE (id) == TYPE_DECL)
3662 type = TREE_TYPE (id);
3665 /* Built-in types come as identifiers. */
3666 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3668 register tree t = lookup_name (id);
3669 if (TREE_TYPE (t) == error_mark_node)
3671 else if (!t || TREE_CODE (t) != TYPE_DECL)
3672 error ("`%s' fails to be a typedef or built in type",
3673 IDENTIFIER_POINTER (id));
3676 type = TREE_TYPE (t);
3680 else if (TREE_CODE (id) != ERROR_MARK)
3686 typedef_type = type;
3688 size_varies = C_TYPE_VARIABLE_SIZE (type);
3690 /* No type at all: default to `int', and set EXPLICIT_INT
3691 because it was not a user-defined typedef. */
3695 if (funcdef_flag && warn_return_type
3696 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3697 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3698 warn_about_return_type = 1;
3700 type = integer_type_node;
3703 /* Now process the modifiers that were specified
3704 and check for invalid combinations. */
3706 /* Long double is a special combination. */
3708 if ((specbits & 1 << (int) RID_LONG)
3709 && TYPE_MAIN_VARIANT (type) == double_type_node)
3711 specbits &= ~ (1 << (int) RID_LONG);
3712 type = long_double_type_node;
3715 /* Check all other uses of type modifiers. */
3717 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3718 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3722 if (TREE_CODE (type) != INTEGER_TYPE)
3723 error ("long, short, signed or unsigned invalid for `%s'", name);
3724 else if ((specbits & 1 << (int) RID_LONG)
3725 && (specbits & 1 << (int) RID_SHORT))
3726 error ("long and short specified together for `%s'", name);
3727 else if (((specbits & 1 << (int) RID_LONG)
3728 || (specbits & 1 << (int) RID_SHORT))
3730 error ("long or short specified with char for `%s'", name);
3731 else if (((specbits & 1 << (int) RID_LONG)
3732 || (specbits & 1 << (int) RID_SHORT))
3733 && TREE_CODE (type) == REAL_TYPE)
3734 error ("long or short specified with floating type for `%s'", name);
3735 else if ((specbits & 1 << (int) RID_SIGNED)
3736 && (specbits & 1 << (int) RID_UNSIGNED))
3737 error ("signed and unsigned given together for `%s'", name);
3741 if (!explicit_int && !explicit_char && pedantic)
3743 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3745 if (flag_pedantic_errors)
3750 /* Discard the type modifiers if they are invalid. */
3753 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3754 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3759 /* Decide whether an integer type is signed or not.
3760 Optionally treat bitfields as signed by default. */
3761 if (specbits & 1 << (int) RID_UNSIGNED
3762 /* Traditionally, all bitfields are unsigned. */
3763 || (bitfield && flag_traditional
3764 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3765 || (bitfield && ! flag_signed_bitfields
3766 && (explicit_int || explicit_char
3767 /* A typedef for plain `int' without `signed'
3768 can be controlled just like plain `int'. */
3769 || ! (typedef_decl != 0
3770 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3771 && TREE_CODE (type) != ENUMERAL_TYPE
3772 && !(specbits & 1 << (int) RID_SIGNED)))
3775 type = long_long_unsigned_type_node;
3776 else if (specbits & 1 << (int) RID_LONG)
3777 type = long_unsigned_type_node;
3778 else if (specbits & 1 << (int) RID_SHORT)
3779 type = short_unsigned_type_node;
3780 else if (type == char_type_node)
3781 type = unsigned_char_type_node;
3782 else if (typedef_decl)
3783 type = unsigned_type (type);
3785 type = unsigned_type_node;
3787 else if ((specbits & 1 << (int) RID_SIGNED)
3788 && type == char_type_node)
3789 type = signed_char_type_node;
3791 type = long_long_integer_type_node;
3792 else if (specbits & 1 << (int) RID_LONG)
3793 type = long_integer_type_node;
3794 else if (specbits & 1 << (int) RID_SHORT)
3795 type = short_integer_type_node;
3797 /* Set CONSTP if this declaration is `const', whether by
3798 explicit specification or via a typedef.
3799 Likewise for VOLATILEP. */
3801 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3802 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3803 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3805 pedwarn ("duplicate `const'");
3807 pedwarn ("duplicate `volatile'");
3808 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
3809 type = TYPE_MAIN_VARIANT (type);
3811 /* Warn if two storage classes are given. Default to `auto'. */
3816 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3817 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3818 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3819 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3820 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3822 /* Warn about storage classes that are invalid for certain
3823 kinds of declarations (parameters, typenames, etc.). */
3826 error ("multiple storage classes in declaration of `%s'", name);
3827 else if (funcdef_flag
3829 & ((1 << (int) RID_REGISTER)
3830 | (1 << (int) RID_AUTO)
3831 | (1 << (int) RID_TYPEDEF))))
3833 if (specbits & 1 << (int) RID_AUTO
3834 && (pedantic || current_binding_level == global_binding_level))
3835 pedwarn ("function definition declared `auto'");
3836 if (specbits & 1 << (int) RID_REGISTER)
3837 error ("function definition declared `register'");
3838 if (specbits & 1 << (int) RID_TYPEDEF)
3839 error ("function definition declared `typedef'");
3840 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3841 | (1 << (int) RID_AUTO));
3843 else if (decl_context != NORMAL && nclasses > 0)
3845 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3849 error ((decl_context == FIELD
3850 ? "storage class specified for structure field `%s'"
3851 : (decl_context == PARM
3852 ? "storage class specified for parameter `%s'"
3853 : "storage class specified for typename")),
3855 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3856 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3857 | (1 << (int) RID_EXTERN));
3860 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3862 /* `extern' with initialization is invalid if not at top level. */
3863 if (current_binding_level == global_binding_level)
3864 warning ("`%s' initialized and declared `extern'", name);
3866 error ("`%s' has both `extern' and initializer", name);
3868 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
3869 && current_binding_level != global_binding_level)
3870 error ("nested function `%s' declared `extern'", name);
3871 else if (current_binding_level == global_binding_level
3872 && specbits & (1 << (int) RID_AUTO))
3873 error ("top-level declaration of `%s' specifies `auto'", name);
3876 /* Now figure out the structure of the declarator proper.
3877 Descend through it, creating more complex types, until we reach
3878 the declared identifier (or NULL_TREE, in an absolute declarator). */
3880 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3882 if (type == error_mark_node)
3884 declarator = TREE_OPERAND (declarator, 0);
3888 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3889 an INDIRECT_REF (for *...),
3890 a CALL_EXPR (for ...(...)),
3891 an identifier (for the name being declared)
3892 or a null pointer (for the place in an absolute declarator
3893 where the name was omitted).
3894 For the last two cases, we have just exited the loop.
3896 At this point, TYPE is the type of elements of an array,
3897 or for a function to return, or for a pointer to point to.
3898 After this sequence of ifs, TYPE is the type of the
3899 array or function or pointer, and DECLARATOR has had its
3900 outermost layer removed. */
3902 if (TREE_CODE (declarator) == ARRAY_REF)
3904 register tree itype = NULL_TREE;
3905 register tree size = TREE_OPERAND (declarator, 1);
3907 declarator = TREE_OPERAND (declarator, 0);
3909 /* Check for some types that there cannot be arrays of. */
3911 if (TYPE_MAIN_VARIANT (type) == void_type_node)
3913 error ("declaration of `%s' as array of voids", name);
3914 type = error_mark_node;
3917 if (TREE_CODE (type) == FUNCTION_TYPE)
3919 error ("declaration of `%s' as array of functions", name);
3920 type = error_mark_node;
3923 if (size == error_mark_node)
3924 type = error_mark_node;
3926 if (type == error_mark_node)
3929 /* If size was specified, set ITYPE to a range-type for that size.
3930 Otherwise, ITYPE remains null. finish_decl may figure it out
3931 from an initial value. */
3935 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3936 STRIP_TYPE_NOPS (size);
3938 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
3939 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
3941 error ("size of array `%s' has non-integer type", name);
3942 size = integer_one_node;
3944 if (pedantic && integer_zerop (size))
3945 pedwarn ("ANSI C forbids zero-size array `%s'", name);
3946 if (TREE_CODE (size) == INTEGER_CST)
3948 if (INT_CST_LT (size, integer_zero_node))
3950 error ("size of array `%s' is negative", name);
3951 size = integer_one_node;
3953 itype = build_index_type (size_binop (MINUS_EXPR, size,
3959 pedwarn ("ANSI C forbids variable-size array `%s'", name);
3960 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
3962 /* Make sure the array size remains visibly nonconstant
3963 even if it is (eg) a const variable with known value. */
3965 itype = variable_size (itype);
3966 itype = build_index_type (itype);
3970 #if 0 /* This had bad results for pointers to arrays, as in
3971 union incomplete (*foo)[4]; */
3972 /* Complain about arrays of incomplete types, except in typedefs. */
3974 if (TYPE_SIZE (type) == 0
3975 /* Avoid multiple warnings for nested array types. */
3976 && TREE_CODE (type) != ARRAY_TYPE
3977 && !(specbits & (1 << (int) RID_TYPEDEF))
3978 && !C_TYPE_BEING_DEFINED (type))
3979 warning ("array type has incomplete element type");
3982 /* Build the array type itself.
3983 Merge any constancy or volatility into the target type. */
3985 #if 0 /* We shouldn't have a function type here at all!
3986 Functions aren't allowed as array elements. */
3987 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3988 && (constp || volatilep))
3989 pedwarn ("ANSI C forbids const or volatile function types");
3991 if (constp || volatilep)
3992 type = c_build_type_variant (type, constp, volatilep);
3994 #if 0 /* don't clear these; leave them set so that the array type
3995 or the variable is itself const or volatile. */
4000 type = build_array_type (type, itype);
4002 C_TYPE_VARIABLE_SIZE (type) = 1;
4004 else if (TREE_CODE (declarator) == CALL_EXPR)
4006 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4007 || current_binding_level == global_binding_level);
4010 /* Declaring a function type.
4011 Make sure we have a valid type for the function to return. */
4012 if (type == error_mark_node)
4017 /* Warn about some types functions can't return. */
4019 if (TREE_CODE (type) == FUNCTION_TYPE)
4021 error ("`%s' declared as function returning a function", name);
4022 type = integer_type_node;
4024 if (TREE_CODE (type) == ARRAY_TYPE)
4026 error ("`%s' declared as function returning an array", name);
4027 type = integer_type_node;
4030 #ifndef TRADITIONAL_RETURN_FLOAT
4031 /* Traditionally, declaring return type float means double. */
4033 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4034 type = double_type_node;
4035 #endif /* TRADITIONAL_RETURN_FLOAT */
4037 /* If this is a block level extern, it must live past the end
4038 of the function so that we can check it against other extern
4039 declarations (IDENTIFIER_LIMBO_VALUE). */
4040 if (extern_ref && allocation_temporary_p ())
4041 end_temporary_allocation ();
4043 /* Construct the function type and go to the next
4044 inner layer of declarator. */
4046 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4048 /* Say it's a definition
4049 only for the CALL_EXPR
4050 closest to the identifier. */
4051 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4052 #if 0 /* This seems to be false. We turn off temporary allocation
4053 above in this function if -traditional.
4054 And this code caused inconsistent results with prototypes:
4055 callers would ignore them, and pass arguments wrong. */
4057 /* Omit the arg types if -traditional, since the arg types
4058 and the list links might not be permanent. */
4059 type = build_function_type (type,
4061 ? NULL_TREE : arg_types);
4063 type = build_function_type (type, arg_types);
4064 declarator = TREE_OPERAND (declarator, 0);
4066 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4067 the formal parameter list of this FUNCTION_TYPE to point to
4068 the FUNCTION_TYPE node itself. */
4073 for (link = current_function_parm_tags;
4075 link = TREE_CHAIN (link))
4076 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4079 else if (TREE_CODE (declarator) == INDIRECT_REF)
4081 /* Merge any constancy or volatility into the target type
4084 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4085 && (constp || volatilep))
4086 pedwarn ("ANSI C forbids const or volatile function types");
4087 if (constp || volatilep)
4088 type = c_build_type_variant (type, constp, volatilep);
4093 type = build_pointer_type (type);
4095 /* Process a list of type modifier keywords
4096 (such as const or volatile) that were given inside the `*'. */
4098 if (TREE_TYPE (declarator))
4100 register tree typemodlist;
4102 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4103 typemodlist = TREE_CHAIN (typemodlist))
4105 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4107 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4112 error ("invalid type modifier within pointer declarator");
4116 pedwarn ("duplicate `const'");
4118 pedwarn ("duplicate `volatile'");
4121 declarator = TREE_OPERAND (declarator, 0);
4128 /* Now TYPE has the actual type. */
4130 /* If this is declaring a typedef name, return a TYPE_DECL. */
4132 if (specbits & (1 << (int) RID_TYPEDEF))
4135 /* Note that the grammar rejects storage classes
4136 in typenames, fields or parameters */
4137 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4138 && (constp || volatilep))
4139 pedwarn ("ANSI C forbids const or volatile function types");
4140 if (constp || volatilep)
4141 type = c_build_type_variant (type, constp, volatilep);
4143 decl = build_decl (TYPE_DECL, declarator, type);
4144 if ((specbits & (1 << (int) RID_SIGNED))
4145 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4146 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4150 /* Detect the case of an array type of unspecified size
4151 which came, as such, direct from a typedef name.
4152 We must copy the type, so that each identifier gets
4153 a distinct type, so that each identifier's size can be
4154 controlled separately by its own initializer. */
4156 if (type != 0 && typedef_type != 0
4157 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4158 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4160 type = build_array_type (TREE_TYPE (type), 0);
4162 C_TYPE_VARIABLE_SIZE (type) = 1;
4165 /* If this is a type name (such as, in a cast or sizeof),
4166 compute the type and return it now. */
4168 if (decl_context == TYPENAME)
4170 /* Note that the grammar rejects storage classes
4171 in typenames, fields or parameters */
4172 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4173 && (constp || volatilep))
4174 pedwarn ("ANSI C forbids const or volatile function types");
4175 if (constp || volatilep)
4176 type = c_build_type_variant (type, constp, volatilep);
4181 /* `void' at top level (not within pointer)
4182 is allowed only in typedefs or type names.
4183 We don't complain about parms either, but that is because
4184 a better error message can be made later. */
4186 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM)
4188 error ("variable or field `%s' declared void",
4189 IDENTIFIER_POINTER (declarator));
4190 type = integer_type_node;
4193 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4194 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4199 if (decl_context == PARM)
4201 tree type_as_written = type;
4204 /* A parameter declared as an array of T is really a pointer to T.
4205 One declared as a function is really a pointer to a function. */
4207 if (TREE_CODE (type) == ARRAY_TYPE)
4209 /* Transfer const-ness of array into that of type pointed to. */
4210 type = build_pointer_type
4211 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4212 volatilep = constp = 0;
4215 else if (TREE_CODE (type) == FUNCTION_TYPE)
4217 if (pedantic && (constp || volatilep))
4218 pedwarn ("ANSI C forbids const or volatile function types");
4219 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4220 volatilep = constp = 0;
4223 decl = build_decl (PARM_DECL, declarator, type);
4225 C_DECL_VARIABLE_SIZE (decl) = 1;
4227 /* Compute the type actually passed in the parmlist,
4228 for the case where there is no prototype.
4229 (For example, shorts and chars are passed as ints.)
4230 When there is a prototype, this is overridden later. */
4232 DECL_ARG_TYPE (decl) = type;
4233 main_type = TYPE_MAIN_VARIANT (type);
4234 if (main_type == float_type_node)
4235 DECL_ARG_TYPE (decl) = double_type_node;
4236 /* Don't use TYPE_PRECISION to decide whether to promote,
4237 because we should convert short if it's the same size as int,
4238 but we should not convert long if it's the same size as int. */
4239 else if (C_PROMOTING_INTEGER_TYPE_P (main_type))
4241 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4242 && TREE_UNSIGNED (type))
4243 DECL_ARG_TYPE (decl) = unsigned_type_node;
4245 DECL_ARG_TYPE (decl) = integer_type_node;
4248 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4250 else if (decl_context == FIELD)
4252 /* Structure field. It may not be a function. */
4254 if (TREE_CODE (type) == FUNCTION_TYPE)
4256 error ("field `%s' declared as a function",
4257 IDENTIFIER_POINTER (declarator));
4258 type = build_pointer_type (type);
4260 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4262 error ("field `%s' has incomplete type",
4263 IDENTIFIER_POINTER (declarator));
4264 type = error_mark_node;
4266 /* Move type qualifiers down to element of an array. */
4267 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4269 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4271 TYPE_DOMAIN (type));
4272 #if 0 /* Leave the field const or volatile as well. */
4273 constp = volatilep = 0;
4276 decl = build_decl (FIELD_DECL, declarator, type);
4278 C_DECL_VARIABLE_SIZE (decl) = 1;
4280 else if (TREE_CODE (type) == FUNCTION_TYPE)
4282 /* Every function declaration is "external"
4283 except for those which are inside a function body
4284 in which `auto' is used.
4285 That is a case not specified by ANSI C,
4286 and we use it for forward declarations for nested functions. */
4287 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4288 || current_binding_level == global_binding_level);
4290 if (specbits & (1 << (int) RID_AUTO)
4291 && (pedantic || current_binding_level == global_binding_level))
4292 pedwarn ("invalid storage class for function `%s'",
4293 IDENTIFIER_POINTER (declarator));
4294 if (specbits & (1 << (int) RID_REGISTER))
4295 error ("invalid storage class for function `%s'",
4296 IDENTIFIER_POINTER (declarator));
4297 /* Function declaration not at top level.
4298 Storage classes other than `extern' are not allowed
4299 and `extern' makes no difference. */
4300 if (current_binding_level != global_binding_level
4301 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4303 pedwarn ("invalid storage class for function `%s'",
4304 IDENTIFIER_POINTER (declarator));
4306 /* If this is a block level extern, it must live past the end
4307 of the function so that we can check it against other
4308 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4309 if (extern_ref && allocation_temporary_p ())
4310 end_temporary_allocation ();
4312 decl = build_decl (FUNCTION_DECL, declarator, type);
4314 if (pedantic && (constp || volatilep)
4315 && ! DECL_IN_SYSTEM_HEADER (decl))
4316 pedwarn ("ANSI C forbids const or volatile functions");
4319 DECL_EXTERNAL (decl) = 1;
4320 /* Record absence of global scope for `static' or `auto'. */
4322 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4323 /* Record presence of `inline', if it is reasonable. */
4326 tree last = tree_last (TYPE_ARG_TYPES (type));
4328 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4329 warning ("cannot inline function `main'");
4330 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4332 warning ("inline declaration ignored for function with `...'");
4334 /* Assume that otherwise the function can be inlined. */
4335 DECL_INLINE (decl) = 1;
4337 if (specbits & (1 << (int) RID_EXTERN))
4338 current_extern_inline = 1;
4343 /* It's a variable. */
4344 /* An uninitialized decl with `extern' is a reference. */
4345 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4347 /* Move type qualifiers down to element of an array. */
4348 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4350 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4352 TYPE_DOMAIN (type));
4353 #if 0 /* Leave the variable const or volatile as well. */
4354 constp = volatilep = 0;
4358 /* If this is a block level extern, it must live past the end
4359 of the function so that we can check it against other
4360 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4361 if (extern_ref && allocation_temporary_p ())
4362 end_temporary_allocation ();
4364 decl = build_decl (VAR_DECL, declarator, type);
4366 C_DECL_VARIABLE_SIZE (decl) = 1;
4369 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4371 DECL_EXTERNAL (decl) = extern_ref;
4372 /* At top level, the presence of a `static' or `register' storage
4373 class specifier, or the absence of all storage class specifiers
4374 makes this declaration a definition (perhaps tentative). Also,
4375 the absence of both `static' and `register' makes it public. */
4376 if (current_binding_level == global_binding_level)
4380 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4381 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4383 /* Not at top level, only `static' makes a static definition. */
4386 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4387 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4391 /* Record `register' declaration for warnings on &
4392 and in case doing stupid register allocation. */
4394 if (specbits & (1 << (int) RID_REGISTER))
4395 DECL_REGISTER (decl) = 1;
4397 /* Record constancy and volatility. */
4400 TREE_READONLY (decl) = 1;
4403 TREE_SIDE_EFFECTS (decl) = 1;
4404 TREE_THIS_VOLATILE (decl) = 1;
4406 /* If a type has volatile components, it should be stored in memory.
4407 Otherwise, the fact that those components are volatile
4408 will be ignored, and would even crash the compiler. */
4409 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4410 mark_addressable (decl);
4418 /* Make a variant type in the proper way for C, propagating qualifiers
4419 down to the element type of an array. */
4422 c_build_type_variant (type, constp, volatilep)
4424 int constp, volatilep;
4426 if (TREE_CODE (type) == ARRAY_TYPE)
4427 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4429 TYPE_DOMAIN (type));
4430 return build_type_variant (type, constp, volatilep);
4433 /* Decode the parameter-list info for a function type or function definition.
4434 The argument is the value returned by `get_parm_info' (or made in parse.y
4435 if there is an identifier list instead of a parameter decl list).
4436 These two functions are separate because when a function returns
4437 or receives functions then each is called multiple times but the order
4438 of calls is different. The last call to `grokparms' is always the one
4439 that contains the formal parameter names of a function definition.
4441 Store in `last_function_parms' a chain of the decls of parms.
4442 Also store in `last_function_parm_tags' a chain of the struct, union,
4443 and enum tags declared among the parms.
4445 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4447 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4448 a mere declaration. A nonempty identifier-list gets an error message
4449 when FUNCDEF_FLAG is zero. */
4452 grokparms (parms_info, funcdef_flag)
4456 tree first_parm = TREE_CHAIN (parms_info);
4458 last_function_parms = TREE_PURPOSE (parms_info);
4459 last_function_parm_tags = TREE_VALUE (parms_info);
4461 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4462 && !in_system_header)
4463 warning ("function declaration isn't a prototype");
4466 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4469 pedwarn ("parameter names (without types) in function declaration");
4471 last_function_parms = first_parm;
4478 /* We no longer test FUNCDEF_FLAG.
4479 If the arg types are incomplete in a declaration,
4480 they must include undefined tags.
4481 These tags can never be defined in the scope of the declaration,
4482 so the types can never be completed,
4483 and no call can be compiled successfully. */
4485 /* In a fcn definition, arg types must be complete. */
4488 for (parm = last_function_parms, typelt = first_parm;
4490 parm = TREE_CHAIN (parm))
4491 /* Skip over any enumeration constants declared here. */
4492 if (TREE_CODE (parm) == PARM_DECL)
4494 /* Barf if the parameter itself has an incomplete type. */
4495 tree type = TREE_VALUE (typelt);
4496 if (TYPE_SIZE (type) == 0)
4498 if (funcdef_flag && DECL_NAME (parm) != 0)
4499 error ("parameter `%s' has incomplete type",
4500 IDENTIFIER_POINTER (DECL_NAME (parm)));
4502 warning ("parameter has incomplete type");
4505 TREE_VALUE (typelt) = error_mark_node;
4506 TREE_TYPE (parm) = error_mark_node;
4509 #if 0 /* This has been replaced by parm_tags_warning
4510 which uses a more accurate criterion for what to warn about. */
4513 /* Now warn if is a pointer to an incomplete type. */
4514 while (TREE_CODE (type) == POINTER_TYPE
4515 || TREE_CODE (type) == REFERENCE_TYPE)
4516 type = TREE_TYPE (type);
4517 type = TYPE_MAIN_VARIANT (type);
4518 if (TYPE_SIZE (type) == 0)
4520 if (DECL_NAME (parm) != 0)
4521 warning ("parameter `%s' points to incomplete type",
4522 IDENTIFIER_POINTER (DECL_NAME (parm)));
4524 warning ("parameter points to incomplete type");
4528 typelt = TREE_CHAIN (typelt);
4531 /* Allocate the list of types the way we allocate a type. */
4532 if (first_parm && ! TREE_PERMANENT (first_parm))
4534 /* Construct a copy of the list of types
4535 on the saveable obstack. */
4537 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4538 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4540 return nreverse (result);
4543 /* The list we have is permanent already. */
4549 /* Return a tree_list node with info on a parameter list just parsed.
4550 The TREE_PURPOSE is a chain of decls of those parms.
4551 The TREE_VALUE is a list of structure, union and enum tags defined.
4552 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4553 This tree_list node is later fed to `grokparms'.
4555 VOID_AT_END nonzero means append `void' to the end of the type-list.
4556 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4559 get_parm_info (void_at_end)
4562 register tree decl, t;
4563 register tree types = 0;
4565 tree tags = gettags ();
4566 tree parms = getdecls ();
4568 tree order = current_binding_level->parm_order;
4570 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4571 if (void_at_end && parms != 0
4572 && TREE_CHAIN (parms) == 0
4573 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4574 && DECL_NAME (parms) == 0)
4577 storedecls (NULL_TREE);
4578 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4579 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4582 /* Extract enumerator values and other non-parms declared with the parms.
4583 Likewise any forward parm decls that didn't have real parm decls. */
4584 for (decl = parms; decl; )
4586 tree next = TREE_CHAIN (decl);
4588 if (TREE_CODE (decl) != PARM_DECL)
4590 TREE_CHAIN (decl) = new_parms;
4593 else if (TREE_ASM_WRITTEN (decl))
4595 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4596 TREE_CHAIN (decl) = new_parms;
4602 /* Put the parm decls back in the order they were in in the parm list. */
4603 for (t = order; t; t = TREE_CHAIN (t))
4606 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4608 TREE_CHAIN (TREE_VALUE (t)) = 0;
4611 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4614 /* Store the parmlist in the binding level since the old one
4615 is no longer a valid list. (We have changed the chain pointers.) */
4616 storedecls (new_parms);
4618 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4619 /* There may also be declarations for enumerators if an enumeration
4620 type is declared among the parms. Ignore them here. */
4621 if (TREE_CODE (decl) == PARM_DECL)
4623 /* Since there is a prototype,
4624 args are passed in their declared types. */
4625 tree type = TREE_TYPE (decl);
4626 DECL_ARG_TYPE (decl) = type;
4627 #ifdef PROMOTE_PROTOTYPES
4628 if (TREE_CODE (type) == INTEGER_TYPE
4629 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4630 DECL_ARG_TYPE (decl) = integer_type_node;
4633 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4634 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4635 && DECL_NAME (decl) == 0)
4637 error ("`void' in parameter list must be the entire list");
4643 return saveable_tree_cons (new_parms, tags,
4644 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4646 return saveable_tree_cons (new_parms, tags, nreverse (types));
4649 /* At end of parameter list, warn about any struct, union or enum tags
4650 defined within. Do so because these types cannot ever become complete. */
4653 parmlist_tags_warning ()
4658 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4660 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4661 /* An anonymous union parm type is meaningful as a GNU extension.
4662 So don't warn for that. */
4663 if (code == UNION_TYPE && !pedantic)
4665 if (TREE_PURPOSE (elt) != 0)
4666 warning ("`%s %s' declared inside parameter list",
4667 (code == RECORD_TYPE ? "struct"
4668 : code == UNION_TYPE ? "union"
4670 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4672 warning ("anonymous %s declared inside parameter list",
4673 (code == RECORD_TYPE ? "struct"
4674 : code == UNION_TYPE ? "union"
4679 warning ("its scope is only this definition or declaration,");
4680 warning ("which is probably not what you want.");
4686 /* Get the struct, enum or union (CODE says which) with tag NAME.
4687 Define the tag as a forward-reference if it is not defined. */
4690 xref_tag (code, name)
4691 enum tree_code code;
4694 int temporary = allocation_temporary_p ();
4696 /* If a cross reference is requested, look up the type
4697 already defined for this tag and return it. */
4699 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4700 /* Even if this is the wrong type of tag, return what we found.
4701 There will be an error message anyway, from pending_xref_error.
4702 If we create an empty xref just for an invalid use of the type,
4703 the main result is to create lots of superfluous error messages. */
4707 push_obstacks_nochange ();
4709 if (current_binding_level == global_binding_level && temporary)
4710 end_temporary_allocation ();
4712 /* If no such tag is yet defined, create a forward-reference node
4713 and record it as the "definition".
4714 When a real declaration of this type is found,
4715 the forward-reference will be altered into a real type. */
4717 ref = make_node (code);
4718 if (code == ENUMERAL_TYPE)
4720 /* (In ANSI, Enums can be referred to only if already defined.) */
4722 pedwarn ("ANSI C forbids forward references to `enum' types");
4723 /* Give the type a default layout like unsigned int
4724 to avoid crashing if it does not get defined. */
4725 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4726 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4727 TREE_UNSIGNED (ref) = 1;
4728 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4729 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4730 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4733 pushtag (name, ref);
4740 /* Make sure that the tag NAME is defined *in the current binding level*
4741 at least as a forward reference.
4742 CODE says which kind of tag NAME ought to be.
4744 We also do a push_obstacks_nochange
4745 whose matching pop is in finish_struct. */
4748 start_struct (code, name)
4749 enum tree_code code;
4752 /* If there is already a tag defined at this binding level
4753 (as a forward reference), just return it. */
4755 register tree ref = 0;
4757 push_obstacks_nochange ();
4758 if (current_binding_level == global_binding_level)
4759 end_temporary_allocation ();
4762 ref = lookup_tag (code, name, current_binding_level, 1);
4763 if (ref && TREE_CODE (ref) == code)
4765 C_TYPE_BEING_DEFINED (ref) = 1;
4766 if (TYPE_FIELDS (ref))
4767 error ((code == UNION_TYPE ? "redefinition of `union %s'"
4768 : "redefinition of `struct %s'"),
4769 IDENTIFIER_POINTER (name));
4774 /* Otherwise create a forward-reference just so the tag is in scope. */
4776 ref = make_node (code);
4777 pushtag (name, ref);
4778 C_TYPE_BEING_DEFINED (ref) = 1;
4782 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4783 of a structure component, returning a FIELD_DECL node.
4784 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4786 This is done during the parsing of the struct declaration.
4787 The FIELD_DECL nodes are chained together and the lot of them
4788 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4791 grokfield (filename, line, declarator, declspecs, width)
4794 tree declarator, declspecs, width;
4798 /* The corresponding pop_obstacks is in finish_decl. */
4799 push_obstacks_nochange ();
4801 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4803 finish_decl (value, NULL_TREE, NULL_TREE);
4804 DECL_INITIAL (value) = width;
4809 /* Function to help qsort sort FIELD_DECLs by name order. */
4812 field_decl_cmp (x, y)
4815 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
4818 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4819 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4821 We also do a pop_obstacks to match the push in start_struct. */
4824 finish_struct (t, fieldlist)
4825 register tree t, fieldlist;
4829 int toplevel = global_binding_level == current_binding_level;
4831 /* If this type was previously laid out as a forward reference,
4832 make sure we lay it out again. */
4836 /* Nameless union parm types are useful as GCC extension. */
4837 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4838 /* Otherwise, warn about any struct or union def. in parmlist. */
4839 if (in_parm_level_p ())
4842 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4843 : "structure defined inside parms"));
4845 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4846 : "structure defined inside parms"));
4849 old_momentary = suspend_momentary ();
4851 if (fieldlist == 0 && pedantic)
4852 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
4853 : "structure has no members"));
4855 /* Install struct as DECL_CONTEXT of each field decl.
4856 Also process specified field sizes.
4857 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
4858 The specified size is found in the DECL_INITIAL.
4859 Store 0 there, except for ": 0" fields (so we can find them
4860 and delete them, below). */
4862 for (x = fieldlist; x; x = TREE_CHAIN (x))
4864 DECL_CONTEXT (x) = t;
4865 DECL_FIELD_SIZE (x) = 0;
4867 /* If any field is const, the structure type is pseudo-const. */
4868 if (TREE_READONLY (x))
4869 C_TYPE_FIELDS_READONLY (t) = 1;
4872 /* A field that is pseudo-const makes the structure likewise. */
4873 tree t1 = TREE_TYPE (x);
4874 while (TREE_CODE (t1) == ARRAY_TYPE)
4875 t1 = TREE_TYPE (t1);
4876 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4877 && C_TYPE_FIELDS_READONLY (t1))
4878 C_TYPE_FIELDS_READONLY (t) = 1;
4881 /* Any field that is volatile means variables of this type must be
4882 treated in some ways as volatile. */
4883 if (TREE_THIS_VOLATILE (x))
4884 C_TYPE_FIELDS_VOLATILE (t) = 1;
4886 /* Any field of nominal variable size implies structure is too. */
4887 if (C_DECL_VARIABLE_SIZE (x))
4888 C_TYPE_VARIABLE_SIZE (t) = 1;
4890 /* Detect invalid nested redefinition. */
4891 if (TREE_TYPE (x) == t)
4892 error ("nested redefinition of `%s'",
4893 IDENTIFIER_POINTER (TYPE_NAME (t)));
4895 /* Detect invalid bit-field size. */
4896 if (DECL_INITIAL (x))
4897 STRIP_NOPS (DECL_INITIAL (x));
4898 if (DECL_INITIAL (x) && TREE_CODE (DECL_INITIAL (x)) != INTEGER_CST)
4900 error_with_decl (x, "bit-field `%s' width not an integer constant");
4901 DECL_INITIAL (x) = NULL;
4904 /* Detect invalid bit-field type. */
4905 if (DECL_INITIAL (x)
4906 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4907 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4909 error_with_decl (x, "bit-field `%s' has invalid type");
4910 DECL_INITIAL (x) = NULL;
4912 if (DECL_INITIAL (x) && pedantic
4913 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4914 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node)
4915 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
4917 /* Detect and ignore out of range field width. */
4918 if (DECL_INITIAL (x))
4920 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4922 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
4924 DECL_INITIAL (x) = NULL;
4925 error_with_decl (x, "negative width in bit-field `%s'");
4927 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
4928 || width > TYPE_PRECISION (TREE_TYPE (x)))
4930 DECL_INITIAL (x) = NULL;
4931 pedwarn_with_decl (x, "width of `%s' exceeds its type");
4933 else if (width == 0 && DECL_NAME (x) != 0)
4935 error_with_decl (x, "zero width for bit-field `%s'");
4936 DECL_INITIAL (x) = NULL;
4940 /* Process valid field width. */
4941 if (DECL_INITIAL (x))
4943 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4945 DECL_FIELD_SIZE (x) = width;
4946 DECL_BIT_FIELD (x) = 1;
4947 DECL_INITIAL (x) = NULL;
4951 /* field size 0 => force desired amount of alignment. */
4952 #ifdef EMPTY_FIELD_BOUNDARY
4953 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
4955 #ifdef PCC_BITFIELD_TYPE_MATTERS
4956 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
4957 TYPE_ALIGN (TREE_TYPE (x)));
4963 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
4964 : TYPE_ALIGN (TREE_TYPE (x)));
4965 /* Non-bit-fields are aligned for their type, except packed
4966 fields which require only BITS_PER_UNIT alignment. */
4967 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
4971 /* Now DECL_INITIAL is null on all members. */
4973 /* Delete all duplicate fields from the fieldlist */
4974 for (x = fieldlist; x && TREE_CHAIN (x);)
4975 /* Anonymous fields aren't duplicates. */
4976 if (DECL_NAME (TREE_CHAIN (x)) == 0)
4980 register tree y = fieldlist;
4984 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
4990 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
4992 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
4993 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
4995 else x = TREE_CHAIN (x);
4998 /* Now we have the nearly final fieldlist. Record it,
4999 then lay out the structure or union (including the fields). */
5001 TYPE_FIELDS (t) = fieldlist;
5005 /* Delete all zero-width bit-fields from the front of the fieldlist */
5007 && DECL_INITIAL (fieldlist))
5008 fieldlist = TREE_CHAIN (fieldlist);
5009 /* Delete all such members from the rest of the fieldlist */
5010 for (x = fieldlist; x;)
5012 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5013 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5014 else x = TREE_CHAIN (x);
5017 /* Now we have the truly final field list.
5018 Store it in this type and in the variants. */
5020 TYPE_FIELDS (t) = fieldlist;
5022 /* If there are lots of fields, sort so we can look through them fast.
5023 We arbitrarily consider 16 or more elts to be "a lot". */
5027 for (x = fieldlist; x; x = TREE_CHAIN (x))
5038 len += list_length (x);
5039 /* Use the same allocation policy here that make_node uses, to
5040 ensure that this lives as long as the rest of the struct decl.
5041 All decls in an inline function need to be saved. */
5042 if (allocation_temporary_p ())
5043 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5045 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5047 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5048 TYPE_LANG_SPECIFIC (t)->len = len;
5050 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5052 for (x = fieldlist; x; x = TREE_CHAIN (x))
5053 field_array[len++] = x;
5055 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5059 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5061 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5062 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5063 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5066 /* Promote each bit-field's type to int if it is narrower than that. */
5067 for (x = fieldlist; x; x = TREE_CHAIN (x))
5068 if (DECL_BIT_FIELD (x)
5069 && C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)))
5071 tree type = TREE_TYPE (x);
5073 /* Preserve unsignedness if traditional or if not really any wider. */
5074 if (TREE_UNSIGNED (type)
5075 && (flag_traditional
5076 || (TYPE_PRECISION (type)
5077 == TYPE_PRECISION (integer_type_node))))
5078 TREE_TYPE (x) = unsigned_type_node;
5080 TREE_TYPE (x) = integer_type_node;
5083 /* If this structure or union completes the type of any previous
5084 variable declaration, lay it out and output its rtl. */
5086 if (current_binding_level->n_incomplete != 0)
5089 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5091 if (TREE_TYPE (decl) == t
5092 && TREE_CODE (decl) != TYPE_DECL)
5094 layout_decl (decl, 0);
5095 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5096 maybe_objc_check_decl (decl);
5097 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5100 --current_binding_level->n_incomplete;
5102 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5103 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5105 tree element = TREE_TYPE (decl);
5106 while (TREE_CODE (element) == ARRAY_TYPE)
5107 element = TREE_TYPE (element);
5109 layout_array_type (TREE_TYPE (decl));
5114 resume_momentary (old_momentary);
5116 /* Finish debugging output for this type. */
5117 rest_of_type_compilation (t, toplevel);
5119 /* The matching push is in start_struct. */
5125 /* Lay out the type T, and its element type, and so on. */
5128 layout_array_type (t)
5131 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5132 layout_array_type (TREE_TYPE (t));
5136 /* Begin compiling the definition of an enumeration type.
5137 NAME is its name (or null if anonymous).
5138 Returns the type object, as yet incomplete.
5139 Also records info about it so that build_enumerator
5140 may be used to declare the individual values as they are read. */
5146 register tree enumtype = 0;
5148 /* If this is the real definition for a previous forward reference,
5149 fill in the contents in the same object that used to be the
5150 forward reference. */
5153 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5155 /* The corresponding pop_obstacks is in finish_enum. */
5156 push_obstacks_nochange ();
5157 /* If these symbols and types are global, make them permanent. */
5158 if (current_binding_level == global_binding_level)
5159 end_temporary_allocation ();
5161 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5163 enumtype = make_node (ENUMERAL_TYPE);
5164 pushtag (name, enumtype);
5167 C_TYPE_BEING_DEFINED (enumtype) = 1;
5169 if (TYPE_VALUES (enumtype) != 0)
5171 /* This enum is a named one that has been declared already. */
5172 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5174 /* Completely replace its old definition.
5175 The old enumerators remain defined, however. */
5176 TYPE_VALUES (enumtype) = 0;
5179 enum_next_value = integer_zero_node;
5185 /* After processing and defining all the values of an enumeration type,
5186 install their decls in the enumeration type and finish it off.
5187 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5188 Returns ENUMTYPE. */
5191 finish_enum (enumtype, values)
5192 register tree enumtype, values;
5195 tree minnode = 0, maxnode = 0;
5196 register HOST_WIDE_INT maxvalue = 0;
5197 register HOST_WIDE_INT minvalue = 0;
5199 unsigned precision = 0;
5200 int toplevel = global_binding_level == current_binding_level;
5201 int temporary = allocation_temporary_p ();
5203 if (in_parm_level_p ())
5204 warning ("enum defined inside parms");
5206 /* Calculate the maximum value of any enumerator in this type. */
5208 for (pair = values; pair; pair = TREE_CHAIN (pair))
5210 tree value = TREE_VALUE (pair);
5212 minnode = maxnode = TREE_VALUE (pair);
5215 if (tree_int_cst_lt (maxnode, value))
5217 if (tree_int_cst_lt (value, minnode))
5222 TYPE_MIN_VALUE (enumtype) = minnode;
5223 TYPE_MAX_VALUE (enumtype) = maxnode;
5225 /* Determine the precision this type needs. */
5227 if (TREE_INT_CST_HIGH (minnode) >= 0
5228 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5229 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5230 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5231 precision = TYPE_PRECISION (long_long_integer_type_node);
5234 maxvalue = TREE_INT_CST_LOW (maxnode);
5235 minvalue = TREE_INT_CST_LOW (minnode);
5238 precision = floor_log2 (maxvalue) + 1;
5241 /* Compute number of bits to represent magnitude of a negative value.
5242 Add one to MINVALUE since range of negative numbers
5243 includes the power of two. */
5244 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5245 if (negprecision > precision)
5246 precision = negprecision;
5247 precision += 1; /* room for sign bit */
5254 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5255 /* Use the width of the narrowest normal C type which is wide enough. */
5256 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5258 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5260 TYPE_SIZE (enumtype) = 0;
5261 layout_type (enumtype);
5263 /* An enum can have some negative values; then it is signed. */
5264 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5266 /* If the enumerators might not fit in an int, change their type now. */
5267 /* It seems more useful in the debugger to leave these as int
5268 unless the enumerator is wider than int. */
5269 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5270 for (pair = values; pair; pair = TREE_CHAIN (pair))
5272 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5273 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5274 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5275 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5278 /* Replace the decl nodes in VALUES with their names. */
5279 for (pair = values; pair; pair = TREE_CHAIN (pair))
5280 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5282 TYPE_VALUES (enumtype) = values;
5284 /* Finish debugging output for this type. */
5285 rest_of_type_compilation (enumtype, toplevel);
5287 /* This matches a push in start_enum. */
5293 /* Build and install a CONST_DECL for one value of the
5294 current enumeration type (one that was begun with start_enum).
5295 Return a tree-list containing the CONST_DECL and its value.
5296 Assignment of sequential values by default is handled here. */
5299 build_enumerator (name, value)
5304 /* Validate and default VALUE. */
5306 /* Remove no-op casts from the value. */
5308 STRIP_TYPE_NOPS (value);
5310 if (value != 0 && TREE_CODE (value) != INTEGER_CST)
5312 error ("enumerator value for `%s' not integer constant",
5313 IDENTIFIER_POINTER (name));
5317 /* Default based on previous value. */
5318 /* It should no longer be possible to have NON_LVALUE_EXPR
5322 value = enum_next_value;
5324 error ("overflow in enumeration values");
5327 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5329 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5330 value = integer_zero_node;
5333 /* Set basis for default for next value. */
5334 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5335 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5337 /* Now create a declaration for the enum value name. */
5339 decl = build_decl (CONST_DECL, name, integer_type_node);
5340 DECL_INITIAL (decl) = value;
5341 TREE_TYPE (value) = integer_type_node;
5344 return saveable_tree_cons (decl, value, NULL_TREE);
5347 /* Create the FUNCTION_DECL for a function definition.
5348 DECLSPECS and DECLARATOR are the parts of the declaration;
5349 they describe the function's name and the type it returns,
5350 but twisted together in a fashion that parallels the syntax of C.
5352 This function creates a binding context for the function body
5353 as well as setting up the FUNCTION_DECL in current_function_decl.
5355 Returns 1 on success. If the DECLARATOR is not suitable for a function
5356 (it defines a datum instead), we return 0, which tells
5357 yyparse to report a parse error.
5359 NESTED is nonzero for a function nested within another function. */
5362 start_function (declspecs, declarator, nested)
5363 tree declarator, declspecs;
5366 tree decl1, old_decl;
5369 current_function_returns_value = 0; /* Assume, until we see it does. */
5370 current_function_returns_null = 0;
5371 warn_about_return_type = 0;
5372 current_extern_inline = 0;
5373 c_function_varargs = 0;
5375 shadowed_labels = 0;
5377 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5379 /* If the declarator is not suitable for a function definition,
5380 cause a syntax error. */
5384 announce_function (decl1);
5386 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5388 error ("return-type is an incomplete type");
5389 /* Make it return void instead. */
5391 = build_function_type (void_type_node,
5392 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5395 if (warn_about_return_type)
5396 warning ("return-type defaults to `int'");
5398 /* Save the parm names or decls from this function's declarator
5399 where store_parm_decls will find them. */
5400 current_function_parms = last_function_parms;
5401 current_function_parm_tags = last_function_parm_tags;
5403 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5404 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5405 DECL_INITIAL (decl1) = error_mark_node;
5407 /* If this definition isn't a prototype and we had a prototype declaration
5408 before, copy the arg type info from that prototype.
5409 But not if what we had before was a builtin function. */
5410 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5411 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5412 && !DECL_BUILT_IN (old_decl)
5413 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5414 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5415 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5416 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5418 /* Optionally warn of old-fashioned def with no previous prototype. */
5419 if (warn_strict_prototypes
5420 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5421 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5422 warning ("function declaration isn't a prototype");
5423 /* Optionally warn of any global def with no previous prototype. */
5424 else if (warn_missing_prototypes
5425 && TREE_PUBLIC (decl1)
5426 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5427 warning_with_decl (decl1, "no previous prototype for `%s'");
5428 /* Optionally warn of any def with no previous prototype
5429 if the function has already been used. */
5430 else if (warn_missing_prototypes
5431 && old_decl != 0 && TREE_USED (old_decl)
5432 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5433 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5435 /* This is a definition, not a reference.
5436 So normally clear DECL_EXTERNAL.
5437 However, `extern inline' acts like a declaration
5438 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5439 DECL_EXTERNAL (decl1) = current_extern_inline;
5441 /* This function exists in static storage.
5442 (This does not mean `static' in the C sense!) */
5443 TREE_STATIC (decl1) = 1;
5445 /* A nested function is not global. */
5446 if (current_function_decl != 0)
5447 TREE_PUBLIC (decl1) = 0;
5449 /* Record the decl so that the function name is defined.
5450 If we already have a decl for this name, and it is a FUNCTION_DECL,
5451 use the old decl. */
5453 current_function_decl = pushdecl (decl1);
5456 declare_parm_level (1);
5457 current_binding_level->subblocks_tag_transparent = 1;
5459 make_function_rtl (current_function_decl);
5461 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5462 /* Promote the value to int before returning it. */
5463 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5465 /* It retains unsignedness if traditional
5466 or if not really getting wider. */
5467 if (TREE_UNSIGNED (restype)
5468 && (flag_traditional
5469 || (TYPE_PRECISION (restype)
5470 == TYPE_PRECISION (integer_type_node))))
5471 restype = unsigned_type_node;
5473 restype = integer_type_node;
5475 DECL_RESULT (current_function_decl)
5476 = build_decl (RESULT_DECL, NULL_TREE, restype);
5479 /* Allocate further tree nodes temporarily during compilation
5480 of this function only. */
5481 temporary_allocation ();
5483 /* If this fcn was already referenced via a block-scope `extern' decl
5484 (or an implicit decl), propagate certain information about the usage. */
5485 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5486 TREE_ADDRESSABLE (current_function_decl) = 1;
5491 /* Record that this function is going to be a varargs function.
5492 This is called before store_parm_decls, which is too early
5493 to call mark_varargs directly. */
5498 c_function_varargs = 1;
5501 /* Store the parameter declarations into the current function declaration.
5502 This is called after parsing the parameter declarations, before
5503 digesting the body of the function.
5505 For an old-style definition, modify the function's type
5506 to specify at least the number of arguments. */
5511 register tree fndecl = current_function_decl;
5514 /* This is either a chain of PARM_DECLs (if a prototype was used)
5515 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5516 tree specparms = current_function_parms;
5518 /* This is a list of types declared among parms in a prototype. */
5519 tree parmtags = current_function_parm_tags;
5521 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5522 register tree parmdecls = getdecls ();
5524 /* This is a chain of any other decls that came in among the parm
5525 declarations. If a parm is declared with enum {foo, bar} x;
5526 then CONST_DECLs for foo and bar are put here. */
5529 /* Nonzero if this definition is written with a prototype. */
5532 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5534 /* This case is when the function was defined with an ANSI prototype.
5535 The parms already have decls, so we need not do anything here
5536 except record them as in effect
5537 and complain if any redundant old-style parm decls were written. */
5548 error_with_decl (fndecl,
5549 "parm types given both in parmlist and separately");
5550 /* Get rid of the erroneous decls; don't keep them on
5551 the list of parms, since they might not be PARM_DECLs. */
5552 for (decl = current_binding_level->names;
5553 decl; decl = TREE_CHAIN (decl))
5554 if (DECL_NAME (decl))
5555 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5556 for (link = current_binding_level->shadowed;
5557 link; link = TREE_CHAIN (link))
5558 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5559 current_binding_level->names = 0;
5560 current_binding_level->shadowed = 0;
5563 specparms = nreverse (specparms);
5564 for (parm = specparms; parm; parm = next)
5566 next = TREE_CHAIN (parm);
5567 if (TREE_CODE (parm) == PARM_DECL)
5569 if (DECL_NAME (parm) == 0)
5570 error_with_decl (parm, "parameter name omitted");
5571 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5573 error_with_decl (parm, "parameter `%s' declared void");
5574 /* Change the type to error_mark_node so this parameter
5575 will be ignored by assign_parms. */
5576 TREE_TYPE (parm) = error_mark_node;
5582 /* If we find an enum constant or a type tag,
5583 put it aside for the moment. */
5584 TREE_CHAIN (parm) = 0;
5585 others = chainon (others, parm);
5589 /* Get the decls in their original chain order
5590 and record in the function. */
5591 DECL_ARGUMENTS (fndecl) = getdecls ();
5594 /* If this function takes a variable number of arguments,
5595 add a phony parameter to the end of the parm list,
5596 to represent the position of the first unnamed argument. */
5597 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5600 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5601 /* Let's hope the address of the unnamed parm
5602 won't depend on its type. */
5603 TREE_TYPE (dummy) = integer_type_node;
5604 DECL_ARG_TYPE (dummy) = integer_type_node;
5605 DECL_ARGUMENTS (fndecl)
5606 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5610 /* Now pushdecl the enum constants. */
5611 for (parm = others; parm; parm = next)
5613 next = TREE_CHAIN (parm);
5614 if (DECL_NAME (parm) == 0)
5616 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5618 else if (TREE_CODE (parm) != PARM_DECL)
5622 storetags (chainon (parmtags, gettags ()));
5626 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5627 each with a parm name as the TREE_VALUE.
5629 PARMDECLS is a chain of declarations for parameters.
5630 Warning! It can also contain CONST_DECLs which are not parameters
5631 but are names of enumerators of any enum types
5632 declared among the parameters.
5634 First match each formal parameter name with its declaration.
5635 Associate decls with the names and store the decls
5636 into the TREE_PURPOSE slots. */
5638 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5639 DECL_RESULT (parm) = 0;
5641 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5643 register tree tail, found = NULL;
5645 if (TREE_VALUE (parm) == 0)
5647 error_with_decl (fndecl, "parameter name missing from parameter list");
5648 TREE_PURPOSE (parm) = 0;
5652 /* See if any of the parmdecls specifies this parm by name.
5653 Ignore any enumerator decls. */
5654 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5655 if (DECL_NAME (tail) == TREE_VALUE (parm)
5656 && TREE_CODE (tail) == PARM_DECL)
5662 /* If declaration already marked, we have a duplicate name.
5663 Complain, and don't use this decl twice. */
5664 if (found && DECL_RESULT (found) != 0)
5666 error_with_decl (found, "multiple parameters named `%s'");
5670 /* If the declaration says "void", complain and ignore it. */
5671 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5673 error_with_decl (found, "parameter `%s' declared void");
5674 TREE_TYPE (found) = integer_type_node;
5675 DECL_ARG_TYPE (found) = integer_type_node;
5676 layout_decl (found, 0);
5679 /* Traditionally, a parm declared float is actually a double. */
5680 if (found && flag_traditional
5681 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5682 TREE_TYPE (found) = double_type_node;
5684 /* If no declaration found, default to int. */
5687 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5689 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5690 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5691 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5693 warning_with_decl (found, "type of `%s' defaults to `int'");
5697 TREE_PURPOSE (parm) = found;
5699 /* Mark this decl as "already found" -- see test, above.
5700 It is safe to use DECL_RESULT for this
5701 since it is not used in PARM_DECLs or CONST_DECLs. */
5702 DECL_RESULT (found) = error_mark_node;
5705 /* Put anything which is on the parmdecls chain and which is
5706 not a PARM_DECL onto the list NONPARMS. (The types of
5707 non-parm things which might appear on the list include
5708 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5709 any actual PARM_DECLs not matched with any names. */
5712 for (parm = parmdecls; parm; )
5714 tree next = TREE_CHAIN (parm);
5715 TREE_CHAIN (parm) = 0;
5717 if (TREE_CODE (parm) != PARM_DECL)
5718 nonparms = chainon (nonparms, parm);
5721 /* Complain about args with incomplete types. */
5722 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5724 error_with_decl (parm, "parameter `%s' has incomplete type");
5725 TREE_TYPE (parm) = error_mark_node;
5728 if (DECL_RESULT (parm) == 0)
5730 error_with_decl (parm,
5731 "declaration for parameter `%s' but no such parameter");
5732 /* Pretend the parameter was not missing.
5733 This gets us to a standard state and minimizes
5734 further error messages. */
5736 = chainon (specparms,
5737 tree_cons (parm, NULL_TREE, NULL_TREE));
5744 /* Chain the declarations together in the order of the list of names. */
5745 /* Store that chain in the function decl, replacing the list of names. */
5747 DECL_ARGUMENTS (fndecl) = 0;
5750 for (last = 0; parm; parm = TREE_CHAIN (parm))
5751 if (TREE_PURPOSE (parm))
5754 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5756 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5757 last = TREE_PURPOSE (parm);
5758 TREE_CHAIN (last) = 0;
5762 /* If there was a previous prototype,
5763 set the DECL_ARG_TYPE of each argument according to
5764 the type previously specified, and report any mismatches. */
5766 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5769 for (parm = DECL_ARGUMENTS (fndecl),
5770 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5771 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5772 != void_type_node));
5773 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5775 if (parm == 0 || type == 0
5776 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5778 error ("number of arguments doesn't match prototype");
5781 /* Type for passing arg must be consistent
5782 with that declared for the arg. */
5783 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
5785 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5786 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5788 /* Adjust argument to match prototype. E.g. a previous
5789 `int foo(float);' prototype causes
5790 `int foo(x) float x; {...}' to be treated like
5791 `int foo(float x) {...}'. This is particularly
5792 useful for argument types like uid_t. */
5793 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5794 #ifdef PROMOTE_PROTOTYPES
5795 if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
5796 && TYPE_PRECISION (TREE_TYPE (parm))
5797 < TYPE_PRECISION (integer_type_node))
5798 DECL_ARG_TYPE (parm) = integer_type_node;
5801 warning ("promoted argument `%s' doesn't match prototype",
5802 IDENTIFIER_POINTER (DECL_NAME (parm)));
5804 /* If -traditional, allow `int' argument to match
5805 `unsigned' prototype. */
5806 else if (! (flag_traditional
5807 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
5808 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
5809 error ("argument `%s' doesn't match prototype",
5810 IDENTIFIER_POINTER (DECL_NAME (parm)));
5813 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5816 /* Otherwise, create a prototype that would match. */
5820 register tree actual, type;
5821 register tree last = 0;
5823 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5825 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
5828 TREE_CHAIN (last) = type;
5833 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5835 TREE_CHAIN (last) = type;
5839 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5840 of the type of this function, but we need to avoid having this
5841 affect the types of other similarly-typed functions, so we must
5842 first force the generation of an identical (but separate) type
5843 node for the relevant function type. The new node we create
5844 will be a variant of the main variant of the original function
5847 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5849 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5852 /* Now store the final chain of decls for the arguments
5853 as the decl-chain of the current lexical scope.
5854 Put the enumerators in as well, at the front so that
5855 DECL_ARGUMENTS is not modified. */
5857 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
5860 /* Make sure the binding level for the top of the function body
5861 gets a BLOCK if there are any in the function.
5862 Otherwise, the dbx output is wrong. */
5864 keep_next_if_subblocks = 1;
5866 /* ??? This might be an improvement,
5867 but needs to be thought about some more. */
5869 keep_next_level_flag = 1;
5872 /* Write a record describing this function definition to the prototypes
5873 file (if requested). */
5875 gen_aux_info_record (fndecl, 1, 0, prototype);
5877 /* Initialize the RTL code for the function. */
5879 init_function_start (fndecl, input_filename, lineno);
5881 /* If this is a varargs function, inform function.c. */
5883 if (c_function_varargs)
5886 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
5888 declare_function_name ();
5890 /* Set up parameters and prepare for return, for the function. */
5892 expand_function_start (fndecl, 0);
5894 /* If this function is `main', emit a call to `__main'
5895 to run global initializers, etc. */
5896 if (DECL_NAME (fndecl)
5897 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
5898 && DECL_CONTEXT (fndecl) == NULL_TREE)
5899 expand_main_function ();
5902 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5903 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
5904 stands for an ellipsis in the identifier list.
5906 PARMLIST is the data returned by get_parm_info for the
5907 parmlist that follows the semicolon.
5909 We return a value of the same sort that get_parm_info returns,
5910 except that it describes the combination of identifiers and parmlist. */
5913 combine_parm_decls (specparms, parmlist, void_at_end)
5914 tree specparms, parmlist;
5917 register tree fndecl = current_function_decl;
5920 tree parmdecls = TREE_PURPOSE (parmlist);
5922 /* This is a chain of any other decls that came in among the parm
5923 declarations. They were separated already by get_parm_info,
5924 so we just need to keep them separate. */
5925 tree nonparms = TREE_VALUE (parmlist);
5929 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5930 DECL_RESULT (parm) = 0;
5932 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5934 register tree tail, found = NULL;
5936 /* See if any of the parmdecls specifies this parm by name. */
5937 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5938 if (DECL_NAME (tail) == TREE_VALUE (parm))
5944 /* If declaration already marked, we have a duplicate name.
5945 Complain, and don't use this decl twice. */
5946 if (found && DECL_RESULT (found) != 0)
5948 error_with_decl (found, "multiple parameters named `%s'");
5952 /* If the declaration says "void", complain and ignore it. */
5953 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5955 error_with_decl (found, "parameter `%s' declared void");
5956 TREE_TYPE (found) = integer_type_node;
5957 DECL_ARG_TYPE (found) = integer_type_node;
5958 layout_decl (found, 0);
5961 /* Traditionally, a parm declared float is actually a double. */
5962 if (found && flag_traditional
5963 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5964 TREE_TYPE (found) = double_type_node;
5966 /* If no declaration found, default to int. */
5969 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5971 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5972 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5973 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5974 error (found, "type of parameter `%s' is not declared");
5978 TREE_PURPOSE (parm) = found;
5980 /* Mark this decl as "already found" -- see test, above.
5981 It is safe to use DECL_RESULT for this
5982 since it is not used in PARM_DECLs or CONST_DECLs. */
5983 DECL_RESULT (found) = error_mark_node;
5986 /* Complain about any actual PARM_DECLs not matched with any names. */
5988 for (parm = parmdecls; parm; )
5990 tree next = TREE_CHAIN (parm);
5991 TREE_CHAIN (parm) = 0;
5993 /* Complain about args with incomplete types. */
5994 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5996 error_with_decl (parm, "parameter `%s' has incomplete type");
5997 TREE_TYPE (parm) = error_mark_node;
6000 if (DECL_RESULT (parm) == 0)
6002 error_with_decl (parm,
6003 "declaration for parameter `%s' but no such parameter");
6004 /* Pretend the parameter was not missing.
6005 This gets us to a standard state and minimizes
6006 further error messages. */
6008 = chainon (specparms,
6009 tree_cons (parm, NULL_TREE, NULL_TREE));
6015 /* Chain the declarations together in the order of the list of names.
6016 At the same time, build up a list of their types, in reverse order. */
6022 for (last = 0; parm; parm = TREE_CHAIN (parm))
6023 if (TREE_PURPOSE (parm))
6026 parmdecls = TREE_PURPOSE (parm);
6028 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6029 last = TREE_PURPOSE (parm);
6030 TREE_CHAIN (last) = 0;
6032 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6037 return saveable_tree_cons (parmdecls, nonparms,
6038 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6040 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6043 /* Finish up a function declaration and compile that function
6044 all the way to assembler language output. The free the storage
6045 for the function definition.
6047 This is called after parsing the body of the function definition.
6049 NESTED is nonzero if the function being finished is nested in another. */
6052 finish_function (nested)
6055 register tree fndecl = current_function_decl;
6057 /* TREE_READONLY (fndecl) = 1;
6058 This caused &foo to be of type ptr-to-const-function
6059 which then got a warning when stored in a ptr-to-function variable. */
6062 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6064 /* Must mark the RESULT_DECL as being in this function. */
6066 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6068 /* Obey `register' declarations if `setjmp' is called in this fn. */
6069 if (flag_traditional && current_function_calls_setjmp)
6071 setjmp_protect (DECL_INITIAL (fndecl));
6072 setjmp_protect_args ();
6075 #ifdef DEFAULT_MAIN_RETURN
6076 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6078 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6079 != integer_type_node)
6080 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6083 /* Make it so that `main' always returns success by default. */
6084 DEFAULT_MAIN_RETURN;
6089 /* Generate rtl for function exit. */
6090 expand_function_end (input_filename, lineno);
6092 /* So we can tell if jump_optimize sets it to 1. */
6095 /* Run the optimizers and output the assembler code for this function. */
6096 rest_of_compilation (fndecl);
6098 current_function_returns_null |= can_reach_end;
6100 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6101 warning ("`volatile' function does return");
6102 else if (warn_return_type && can_reach_end
6103 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6104 /* If this function returns non-void and control can drop through,
6106 warning ("control reaches end of non-void function");
6107 /* With just -W, complain only if function returns both with
6108 and without a value. */
6109 else if (extra_warnings
6110 && current_function_returns_value && current_function_returns_null)
6111 warning ("this function may return with or without a value");
6113 /* Free all the tree nodes making up this function. */
6114 /* Switch back to allocating nodes permanently
6115 until we start another function. */
6117 permanent_allocation ();
6119 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6121 /* Stop pointing to the local nodes about to be freed. */
6122 /* But DECL_INITIAL must remain nonzero so we know this
6123 was an actual function definition. */
6124 /* For a nested function, this is done in pop_c_function_context. */
6125 DECL_INITIAL (fndecl) = error_mark_node;
6126 DECL_ARGUMENTS (fndecl) = 0;
6131 /* Let the error reporting routines know that we're outside a
6132 function. For a nested function, this value is used in
6133 pop_c_function_context and then reset via pop_function_context. */
6134 current_function_decl = NULL;
6138 /* Save and restore the variables in this file and elsewhere
6139 that keep track of the progress of compilation of the current function.
6140 Used for nested functions. */
6144 struct c_function *next;
6145 tree enum_next_value;
6147 tree shadowed_labels;
6150 int warn_about_return_type;
6152 struct binding_level *binding_level;
6155 struct c_function *c_function_chain;
6157 /* Save and reinitialize the variables
6158 used during compilation of a C function. */
6161 push_c_function_context ()
6163 struct c_function *p
6164 = (struct c_function *) xmalloc (sizeof (struct c_function));
6167 pedwarn ("ANSI C forbids nested functions");
6169 push_function_context ();
6171 p->next = c_function_chain;
6172 c_function_chain = p;
6174 p->enum_next_value = enum_next_value;
6175 p->named_labels = named_labels;
6176 p->shadowed_labels = shadowed_labels;
6177 p->returns_value = current_function_returns_value;
6178 p->returns_null = current_function_returns_null;
6179 p->warn_about_return_type = warn_about_return_type;
6180 p->extern_inline = current_extern_inline;
6181 p->binding_level = current_binding_level;
6184 /* Restore the variables used during compilation of a C function. */
6187 pop_c_function_context ()
6189 struct c_function *p = c_function_chain;
6192 /* Bring back all the labels that were shadowed. */
6193 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6194 if (DECL_NAME (TREE_VALUE (link)) != 0)
6195 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6196 = TREE_VALUE (link);
6198 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6200 /* Stop pointing to the local nodes about to be freed. */
6201 /* But DECL_INITIAL must remain nonzero so we know this
6202 was an actual function definition. */
6203 DECL_INITIAL (current_function_decl) = error_mark_node;
6204 DECL_ARGUMENTS (current_function_decl) = 0;
6207 pop_function_context ();
6209 c_function_chain = p->next;
6211 enum_next_value = p->enum_next_value;
6212 named_labels = p->named_labels;
6213 shadowed_labels = p->shadowed_labels;
6214 current_function_returns_value = p->returns_value;
6215 current_function_returns_null = p->returns_null;
6216 warn_about_return_type = p->warn_about_return_type;
6217 current_extern_inline = p->extern_inline;
6218 current_binding_level = p->binding_level;