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 /* Decode the string P as a language-specific option for C.
509 Return 1 if it is recognized (and handle it);
510 return 0 if not recognized. */
516 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
518 flag_traditional = 1;
519 flag_writable_strings = 1;
520 #if DOLLARS_IN_IDENTIFIERS > 0
521 dollars_in_ident = 1;
524 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
526 flag_traditional = 0;
527 flag_writable_strings = 0;
528 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
530 else if (!strcmp (p, "-fsigned-char"))
531 flag_signed_char = 1;
532 else if (!strcmp (p, "-funsigned-char"))
533 flag_signed_char = 0;
534 else if (!strcmp (p, "-fno-signed-char"))
535 flag_signed_char = 0;
536 else if (!strcmp (p, "-fno-unsigned-char"))
537 flag_signed_char = 1;
538 else if (!strcmp (p, "-fsigned-bitfields")
539 || !strcmp (p, "-fno-unsigned-bitfields"))
541 flag_signed_bitfields = 1;
542 explicit_flag_signed_bitfields = 1;
544 else if (!strcmp (p, "-funsigned-bitfields")
545 || !strcmp (p, "-fno-signed-bitfields"))
547 flag_signed_bitfields = 0;
548 explicit_flag_signed_bitfields = 1;
550 else if (!strcmp (p, "-fshort-enums"))
551 flag_short_enums = 1;
552 else if (!strcmp (p, "-fno-short-enums"))
553 flag_short_enums = 0;
554 else if (!strcmp (p, "-fcond-mismatch"))
555 flag_cond_mismatch = 1;
556 else if (!strcmp (p, "-fno-cond-mismatch"))
557 flag_cond_mismatch = 0;
558 else if (!strcmp (p, "-fshort-double"))
559 flag_short_double = 1;
560 else if (!strcmp (p, "-fno-short-double"))
561 flag_short_double = 0;
562 else if (!strcmp (p, "-fasm"))
564 else if (!strcmp (p, "-fno-asm"))
566 else if (!strcmp (p, "-fbuiltin"))
568 else if (!strcmp (p, "-fno-builtin"))
570 else if (!strcmp (p, "-fno-ident"))
572 else if (!strcmp (p, "-fident"))
574 else if (!strcmp (p, "-ansi"))
575 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
576 else if (!strcmp (p, "-Wimplicit"))
578 else if (!strcmp (p, "-Wno-implicit"))
580 else if (!strcmp (p, "-Wwrite-strings"))
581 warn_write_strings = 1;
582 else if (!strcmp (p, "-Wno-write-strings"))
583 warn_write_strings = 0;
584 else if (!strcmp (p, "-Wcast-qual"))
586 else if (!strcmp (p, "-Wno-cast-qual"))
588 else if (!strcmp (p, "-Wpointer-arith"))
589 warn_pointer_arith = 1;
590 else if (!strcmp (p, "-Wno-pointer-arith"))
591 warn_pointer_arith = 0;
592 else if (!strcmp (p, "-Wstrict-prototypes"))
593 warn_strict_prototypes = 1;
594 else if (!strcmp (p, "-Wno-strict-prototypes"))
595 warn_strict_prototypes = 0;
596 else if (!strcmp (p, "-Wmissing-prototypes"))
597 warn_missing_prototypes = 1;
598 else if (!strcmp (p, "-Wno-missing-prototypes"))
599 warn_missing_prototypes = 0;
600 else if (!strcmp (p, "-Wredundant-decls"))
601 warn_redundant_decls = 1;
602 else if (!strcmp (p, "-Wno-redundant-decls"))
603 warn_redundant_decls = 0;
604 else if (!strcmp (p, "-Wnested-externs"))
605 warn_nested_externs = 1;
606 else if (!strcmp (p, "-Wno-nested-externs"))
607 warn_nested_externs = 0;
608 else if (!strcmp (p, "-Wtraditional"))
609 warn_traditional = 1;
610 else if (!strcmp (p, "-Wno-traditional"))
611 warn_traditional = 0;
612 else if (!strcmp (p, "-Wformat"))
614 else if (!strcmp (p, "-Wno-format"))
616 else if (!strcmp (p, "-Wchar-subscripts"))
617 warn_char_subscripts = 1;
618 else if (!strcmp (p, "-Wno-char-subscripts"))
619 warn_char_subscripts = 0;
620 else if (!strcmp (p, "-Wconversion"))
622 else if (!strcmp (p, "-Wno-conversion"))
624 else if (!strcmp (p, "-Wparentheses"))
625 warn_parentheses = 1;
626 else if (!strcmp (p, "-Wno-parentheses"))
627 warn_parentheses = 0;
628 else if (!strcmp (p, "-Wreturn-type"))
629 warn_return_type = 1;
630 else if (!strcmp (p, "-Wno-return-type"))
631 warn_return_type = 0;
632 else if (!strcmp (p, "-Wcomment"))
633 ; /* cpp handles this one. */
634 else if (!strcmp (p, "-Wno-comment"))
635 ; /* cpp handles this one. */
636 else if (!strcmp (p, "-Wcomments"))
637 ; /* cpp handles this one. */
638 else if (!strcmp (p, "-Wno-comments"))
639 ; /* cpp handles this one. */
640 else if (!strcmp (p, "-Wtrigraphs"))
641 ; /* cpp handles this one. */
642 else if (!strcmp (p, "-Wno-trigraphs"))
643 ; /* cpp handles this one. */
644 else if (!strcmp (p, "-Wimport"))
645 ; /* cpp handles this one. */
646 else if (!strcmp (p, "-Wno-import"))
647 ; /* cpp handles this one. */
648 else if (!strcmp (p, "-Wall"))
651 /* We save the value of warn_uninitialized, since if they put
652 -Wuninitialized on the command line, we need to generate a
653 warning about not using it without also specifying -O. */
654 if (warn_uninitialized != 1)
655 warn_uninitialized = 2;
657 warn_return_type = 1;
661 warn_char_subscripts = 1;
662 warn_parentheses = 1;
670 /* Hooks for print_node. */
683 print_lang_identifier (file, node, indent)
688 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
689 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
690 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
691 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
692 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
693 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
696 /* Create a new `struct binding_level'. */
699 struct binding_level *
700 make_binding_level ()
703 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
706 /* Nonzero if we are currently in the global binding level. */
711 return current_binding_level == global_binding_level;
717 keep_next_level_flag = 1;
720 /* Nonzero if the current level needs to have a BLOCK made. */
725 return ((current_binding_level->keep_if_subblocks
726 && current_binding_level->blocks != 0)
727 || current_binding_level->keep
728 || current_binding_level->names != 0
729 || (current_binding_level->tags != 0
730 && !current_binding_level->tag_transparent));
733 /* Identify this binding level as a level of parameters.
734 DEFINITION_FLAG is 1 for a definition, 0 for a declaration. */
737 declare_parm_level (definition_flag)
740 current_binding_level->parm_flag = 1 + definition_flag;
743 /* Nonzero if currently making parm declarations. */
748 return current_binding_level->parm_flag;
751 /* Enter a new binding level.
752 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
753 not for that of tags. */
756 pushlevel (tag_transparent)
759 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
761 /* If this is the top level of a function,
762 just make sure that NAMED_LABELS is 0. */
764 if (current_binding_level == global_binding_level)
769 /* Reuse or create a struct for this binding level. */
771 if (free_binding_level)
773 newlevel = free_binding_level;
774 free_binding_level = free_binding_level->level_chain;
778 newlevel = make_binding_level ();
781 /* Add this level to the front of the chain (stack) of levels that
784 *newlevel = clear_binding_level;
785 newlevel->tag_transparent
787 || (current_binding_level
788 ? current_binding_level->subblocks_tag_transparent
790 newlevel->level_chain = current_binding_level;
791 current_binding_level = newlevel;
792 newlevel->keep = keep_next_level_flag;
793 keep_next_level_flag = 0;
794 newlevel->keep_if_subblocks = keep_next_if_subblocks;
795 keep_next_if_subblocks = 0;
798 /* Exit a binding level.
799 Pop the level off, and restore the state of the identifier-decl mappings
800 that were in effect when this level was entered.
802 If KEEP is nonzero, this level had explicit declarations, so
803 and create a "block" (a BLOCK node) for the level
804 to record its declarations and subblocks for symbol table output.
806 If FUNCTIONBODY is nonzero, this level is the body of a function,
807 so create a block as if KEEP were set and also clear out all
810 If REVERSE is nonzero, reverse the order of decls before putting
811 them into the BLOCK. */
814 poplevel (keep, reverse, functionbody)
820 /* The chain of decls was accumulated in reverse order.
821 Put it into forward order, just for cleanliness. */
823 tree tags = current_binding_level->tags;
824 tree subblocks = current_binding_level->blocks;
827 int block_previously_created;
829 keep |= current_binding_level->keep;
831 /* This warning is turned off because it causes warnings for
832 declarations like `extern struct foo *x'. */
834 /* Warn about incomplete structure types in this level. */
835 for (link = tags; link; link = TREE_CHAIN (link))
836 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
838 tree type = TREE_VALUE (link);
840 switch (TREE_CODE (type))
843 errmsg = "`struct %s' incomplete in scope ending here";
846 errmsg = "`union %s' incomplete in scope ending here";
849 errmsg = "`enum %s' incomplete in scope ending here";
852 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
853 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
855 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
856 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
860 /* Get the decls in the order they were written.
861 Usually current_binding_level->names is in reverse order.
862 But parameter decls were previously put in forward order. */
865 current_binding_level->names
866 = decls = nreverse (current_binding_level->names);
868 decls = current_binding_level->names;
870 /* Output any nested inline functions within this block
871 if they weren't already output. */
873 for (decl = decls; decl; decl = TREE_CHAIN (decl))
874 if (TREE_CODE (decl) == FUNCTION_DECL
875 && ! TREE_ASM_WRITTEN (decl)
876 && DECL_INITIAL (decl) != 0
877 && TREE_ADDRESSABLE (decl))
879 /* If this decl was copied from a file-scope decl
880 on account of a block-scope extern decl,
881 propagate TREE_ADDRESSABLE to the file-scope decl. */
882 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
883 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
885 output_inline_function (decl);
888 /* If there were any declarations or structure tags in that level,
889 or if this level is a function body,
890 create a BLOCK to record them for the life of this function. */
893 block_previously_created = (current_binding_level->this_block != 0);
894 if (block_previously_created)
895 block = current_binding_level->this_block;
896 else if (keep || functionbody
897 || (current_binding_level->keep_if_subblocks && subblocks != 0))
898 block = make_node (BLOCK);
901 BLOCK_VARS (block) = decls;
902 BLOCK_TYPE_TAGS (block) = tags;
903 BLOCK_SUBBLOCKS (block) = subblocks;
904 remember_end_note (block);
907 /* In each subblock, record that this is its superior. */
909 for (link = subblocks; link; link = TREE_CHAIN (link))
910 BLOCK_SUPERCONTEXT (link) = block;
912 /* Clear out the meanings of the local variables of this level. */
914 for (link = decls; link; link = TREE_CHAIN (link))
916 if (DECL_NAME (link) != 0)
918 /* If the ident. was used or addressed via a local extern decl,
919 don't forget that fact. */
920 if (DECL_EXTERNAL (link))
922 if (TREE_USED (link))
923 TREE_USED (DECL_NAME (link)) = 1;
924 if (TREE_ADDRESSABLE (link))
925 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
927 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
931 /* Restore all name-meanings of the outer levels
932 that were shadowed by this level. */
934 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
935 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
937 /* If the level being exited is the top level of a function,
938 check over all the labels, and clear out the current
939 (function local) meanings of their names. */
943 /* If this is the top level block of a function,
944 the vars are the function's parameters.
945 Don't leave them in the BLOCK because they are
946 found in the FUNCTION_DECL instead. */
948 BLOCK_VARS (block) = 0;
950 /* Clear out the definitions of all label names,
951 since their scopes end here,
952 and add them to BLOCK_VARS. */
954 for (link = named_labels; link; link = TREE_CHAIN (link))
956 register tree label = TREE_VALUE (link);
958 if (DECL_INITIAL (label) == 0)
960 error_with_decl (label, "label `%s' used but not defined");
961 /* Avoid crashing later. */
962 define_label (input_filename, lineno,
965 else if (warn_unused && !TREE_USED (label))
966 warning_with_decl (label, "label `%s' defined but not used");
967 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
969 /* Put the labels into the "variables" of the
970 top-level block, so debugger can see them. */
971 TREE_CHAIN (label) = BLOCK_VARS (block);
972 BLOCK_VARS (block) = label;
976 /* Pop the current level, and free the structure for reuse. */
979 register struct binding_level *level = current_binding_level;
980 current_binding_level = current_binding_level->level_chain;
982 level->level_chain = free_binding_level;
983 free_binding_level = level;
986 /* Dispose of the block that we just made inside some higher level. */
988 DECL_INITIAL (current_function_decl) = block;
991 if (!block_previously_created)
992 current_binding_level->blocks
993 = chainon (current_binding_level->blocks, block);
995 /* If we did not make a block for the level just exited,
996 any blocks made for inner levels
997 (since they cannot be recorded as subblocks in that level)
998 must be carried forward so they will later become subblocks
999 of something else. */
1001 current_binding_level->blocks
1002 = chainon (current_binding_level->blocks, subblocks);
1004 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1005 binding contour so that they point to the appropriate construct, i.e.
1006 either to the current FUNCTION_DECL node, or else to the BLOCK node
1007 we just constructed.
1009 Note that for tagged types whose scope is just the formal parameter
1010 list for some function type specification, we can't properly set
1011 their TYPE_CONTEXTs here, because we don't have a pointer to the
1012 appropriate FUNCTION_TYPE node readily available to us. For those
1013 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1014 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1015 node which will represent the "scope" for these "parameter list local"
1020 for (link = tags; link; link = TREE_CHAIN (link))
1021 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1023 for (link = tags; link; link = TREE_CHAIN (link))
1024 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1027 TREE_USED (block) = 1;
1031 /* Delete the node BLOCK from the current binding level.
1032 This is used for the block inside a stmt expr ({...})
1033 so that the block can be reinserted where appropriate. */
1036 delete_block (block)
1040 if (current_binding_level->blocks == block)
1041 current_binding_level->blocks = TREE_CHAIN (block);
1042 for (t = current_binding_level->blocks; t;)
1044 if (TREE_CHAIN (t) == block)
1045 TREE_CHAIN (t) = TREE_CHAIN (block);
1049 TREE_CHAIN (block) = NULL;
1050 /* Clear TREE_USED which is always set by poplevel.
1051 The flag is set again if insert_block is called. */
1052 TREE_USED (block) = 0;
1055 /* Insert BLOCK at the end of the list of subblocks of the
1056 current binding level. This is used when a BIND_EXPR is expanded,
1057 to handle the BLOCK node inside teh BIND_EXPR. */
1060 insert_block (block)
1063 TREE_USED (block) = 1;
1064 current_binding_level->blocks
1065 = chainon (current_binding_level->blocks, block);
1068 /* Set the BLOCK node for the innermost scope
1069 (the one we are currently in). */
1073 register tree block;
1075 current_binding_level->this_block = block;
1081 register struct binding_level *newlevel;
1083 /* Reuse or create a struct for this binding level. */
1085 if (free_binding_level)
1087 newlevel = free_binding_level;
1088 free_binding_level = free_binding_level->level_chain;
1092 newlevel = make_binding_level ();
1095 /* Add this level to the front of the chain (stack) of label levels. */
1097 newlevel->level_chain = label_level_chain;
1098 label_level_chain = newlevel;
1100 newlevel->names = named_labels;
1101 newlevel->shadowed = shadowed_labels;
1103 shadowed_labels = 0;
1109 register struct binding_level *level = label_level_chain;
1112 /* Clear out the definitions of the declared labels in this level.
1113 Leave in the list any ordinary, non-declared labels. */
1114 for (link = named_labels, prev = 0; link;)
1116 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1118 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1120 error_with_decl ("label `%s' used but not defined",
1122 /* Avoid crashing later. */
1123 define_label (input_filename, lineno,
1124 DECL_NAME (TREE_VALUE (link)));
1126 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1127 warning_with_decl (TREE_VALUE (link),
1128 "label `%s' defined but not used");
1129 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1131 /* Delete this element from the list. */
1132 link = TREE_CHAIN (link);
1134 TREE_CHAIN (prev) = link;
1136 named_labels = link;
1141 link = TREE_CHAIN (link);
1145 /* Bring back all the labels that were shadowed. */
1146 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1147 if (DECL_NAME (TREE_VALUE (link)) != 0)
1148 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1149 = TREE_VALUE (link);
1151 named_labels = chainon (named_labels, level->names);
1152 shadowed_labels = level->shadowed;
1154 /* Pop the current level, and free the structure for reuse. */
1155 label_level_chain = label_level_chain->level_chain;
1156 level->level_chain = free_binding_level;
1157 free_binding_level = level;
1160 /* Push a definition or a declaration of struct, union or enum tag "name".
1161 "type" should be the type node.
1162 We assume that the tag "name" is not already defined.
1164 Note that the definition may really be just a forward reference.
1165 In that case, the TYPE_SIZE will be zero. */
1168 pushtag (name, type)
1171 register struct binding_level *b;
1173 /* Find the proper binding level for this type tag. */
1175 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1180 /* Record the identifier as the type's name if it has none. */
1182 if (TYPE_NAME (type) == 0)
1183 TYPE_NAME (type) = name;
1186 if (b == global_binding_level)
1187 b->tags = perm_tree_cons (name, type, b->tags);
1189 b->tags = saveable_tree_cons (name, type, b->tags);
1191 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1192 tagged type we just added to the current binding level. This fake
1193 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1194 to output a representation of a tagged type, and it also gives
1195 us a convenient place to record the "scope start" address for the
1198 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1201 /* Handle when a new declaration NEWDECL
1202 has the same name as an old one OLDDECL
1203 in the same binding contour.
1204 Prints an error message if appropriate.
1206 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1207 Otherwise, return 0. */
1210 duplicate_decls (newdecl, olddecl)
1211 register tree newdecl, olddecl;
1213 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1214 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1215 && DECL_INITIAL (newdecl) != 0);
1216 tree oldtype = TREE_TYPE (olddecl);
1217 tree newtype = TREE_TYPE (newdecl);
1219 if (TREE_CODE (newtype) == ERROR_MARK
1220 || TREE_CODE (oldtype) == ERROR_MARK)
1223 /* New decl is completely inconsistent with the old one =>
1224 tell caller to replace the old one.
1225 This is always an error except in the case of shadowing a builtin. */
1226 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1228 if (TREE_CODE (olddecl) == FUNCTION_DECL
1229 && DECL_BUILT_IN (olddecl))
1231 /* If you declare a built-in function name as static, the
1232 built-in definition is overridden,
1233 but optionally warn this was a bad choice of name. */
1234 if (!TREE_PUBLIC (newdecl))
1237 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1239 /* Likewise, if the built-in is not ansi, then programs can
1240 override it even globally without an error. */
1241 else if (DECL_BUILT_IN_NONANSI (olddecl))
1242 warning_with_decl (newdecl,
1243 "built-in function `%s' declared as non-function");
1245 error_with_decl (newdecl,
1246 "built-in function `%s' declared as non-function");
1248 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1249 && DECL_BUILT_IN_NONANSI (olddecl))
1251 /* If overriding decl is static,
1252 optionally warn this was a bad choice of name. */
1253 if (!TREE_PUBLIC (newdecl))
1256 warning_with_decl (newdecl, "shadowing library function `%s'");
1258 /* Otherwise, always warn. */
1260 warning_with_decl (newdecl,
1261 "library function `%s' declared as non-function");
1265 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1266 error_with_decl (olddecl, "previous declaration of `%s'");
1272 /* For real parm decl following a forward decl,
1273 return 1 so old decl will be reused. */
1274 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1275 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1278 /* The new declaration is the same kind of object as the old one.
1279 The declarations may partially match. Print warnings if they don't
1280 match enough. Ultimately, copy most of the information from the new
1281 decl to the old one, and keep using the old one. */
1283 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1284 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1285 && DECL_INITIAL (olddecl) == 0)
1286 /* If -traditional, avoid error for redeclaring fcn
1287 after implicit decl. */
1289 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1290 && DECL_BUILT_IN (olddecl))
1292 /* A function declaration for a built-in function. */
1293 if (!TREE_PUBLIC (newdecl))
1295 /* If you declare a built-in function name as static, the
1296 built-in definition is overridden,
1297 but optionally warn this was a bad choice of name. */
1299 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1300 /* Discard the old built-in function. */
1303 else if (!types_match)
1305 /* Accept the return type of the new declaration if same modes. */
1306 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1307 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1308 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1310 /* Function types may be shared, so we can't just modify
1311 the return type of olddecl's function type. */
1313 = build_function_type (newreturntype,
1314 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1316 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1318 TREE_TYPE (olddecl) = newtype;
1323 /* If types don't match for a built-in, throw away the built-in. */
1324 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1328 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1329 && DECL_SOURCE_LINE (olddecl) == 0)
1331 /* A function declaration for a predeclared function
1332 that isn't actually built in. */
1333 if (!TREE_PUBLIC (newdecl))
1335 /* If you declare it as static, the
1336 default definition is overridden. */
1339 else if (!types_match)
1341 /* If the types don't match, preserve volatility indication.
1342 Later on, we will discard everything else about the
1343 default declaration. */
1344 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1347 /* Permit char *foo () to match void *foo (...) if not pedantic,
1348 if one of them came from a system header file. */
1349 else if (!types_match
1350 && TREE_CODE (olddecl) == FUNCTION_DECL
1351 && TREE_CODE (newdecl) == FUNCTION_DECL
1352 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1353 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1354 && (DECL_IN_SYSTEM_HEADER (olddecl)
1355 || DECL_IN_SYSTEM_HEADER (newdecl))
1356 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1357 && TYPE_ARG_TYPES (oldtype) == 0
1358 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1359 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1361 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1362 && TYPE_ARG_TYPES (newtype) == 0
1363 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1364 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1367 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1368 /* Make sure we keep void * as ret type, not char *. */
1369 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1370 TREE_TYPE (newdecl) = newtype = oldtype;
1372 else if (!types_match
1373 /* Permit char *foo (int, ...); followed by char *foo ();
1375 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1377 /* Return types must still match. */
1378 && comptypes (TREE_TYPE (oldtype),
1379 TREE_TYPE (newtype))
1380 && TYPE_ARG_TYPES (newtype) == 0))
1382 error_with_decl (newdecl, "conflicting types for `%s'");
1383 /* Check for function type mismatch
1384 involving an empty arglist vs a nonempty one. */
1385 if (TREE_CODE (olddecl) == FUNCTION_DECL
1386 && comptypes (TREE_TYPE (oldtype),
1387 TREE_TYPE (newtype))
1388 && ((TYPE_ARG_TYPES (oldtype) == 0
1389 && DECL_INITIAL (olddecl) == 0)
1391 (TYPE_ARG_TYPES (newtype) == 0
1392 && DECL_INITIAL (newdecl) == 0)))
1394 /* Classify the problem further. */
1395 register tree t = TYPE_ARG_TYPES (oldtype);
1397 t = TYPE_ARG_TYPES (newtype);
1398 for (; t; t = TREE_CHAIN (t))
1400 register tree type = TREE_VALUE (t);
1402 if (TREE_CHAIN (t) == 0
1403 && TYPE_MAIN_VARIANT (type) != void_type_node)
1405 error ("A parameter list with an ellipsis can't match");
1406 error ("an empty parameter name list declaration.");
1410 if (TYPE_MAIN_VARIANT (type) == float_type_node
1411 || C_PROMOTING_INTEGER_TYPE_P (type))
1413 error ("An argument type that has a default promotion");
1414 error ("can't match an empty parameter name list declaration.");
1419 error_with_decl (olddecl, "previous declaration of `%s'");
1423 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1426 error_with_decl (newdecl, errmsg);
1427 error_with_decl (olddecl,
1428 ((DECL_INITIAL (olddecl)
1429 && current_binding_level == global_binding_level)
1430 ? "`%s' previously defined here"
1431 : "`%s' previously declared here"));
1433 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1434 && DECL_INITIAL (olddecl) != 0
1435 && TYPE_ARG_TYPES (oldtype) == 0
1436 && TYPE_ARG_TYPES (newtype) != 0)
1438 register tree type, parm;
1440 /* Prototype decl follows defn w/o prototype. */
1442 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1443 type = TYPE_ARG_TYPES (newtype),
1445 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1446 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1447 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1449 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1450 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1452 errmsg = "prototype for `%s' follows and number of arguments";
1455 /* Type for passing arg must be consistent
1456 with that declared for the arg. */
1457 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1458 /* If -traditional, allow `unsigned int' instead of `int'
1459 in the prototype. */
1460 && (! (flag_traditional
1461 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1462 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1464 errmsg = "prototype for `%s' follows and argument %d";
1470 error_with_decl (newdecl, errmsg, nargs);
1471 error_with_decl (olddecl,
1472 "doesn't match non-prototype definition here");
1476 warning_with_decl (newdecl, "prototype for `%s' follows");
1477 warning_with_decl (olddecl, "non-prototype definition here");
1480 /* Warn about mismatches in various flags. */
1483 /* Warn if function is now inline
1484 but was previously declared not inline and has been called. */
1485 if (TREE_CODE (olddecl) == FUNCTION_DECL
1486 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1487 && TREE_USED (olddecl))
1488 warning_with_decl (newdecl,
1489 "`%s' declared inline after being called");
1490 if (TREE_CODE (olddecl) == FUNCTION_DECL
1491 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1492 && DECL_INITIAL (olddecl) != 0)
1493 warning_with_decl (newdecl,
1494 "`%s' declared inline after its definition");
1495 /* It is nice to warn when a function is declared
1496 global first and then static. */
1497 if (TREE_CODE (olddecl) == FUNCTION_DECL
1498 && TREE_PUBLIC (olddecl)
1499 && !TREE_PUBLIC (newdecl))
1500 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1502 /* These bits are logically part of the type, for variables.
1503 But not for functions
1504 (where qualifiers are not valid ANSI anyway). */
1505 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1506 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1507 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1508 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1512 /* Optionally warn about more than one declaration for the same name. */
1513 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1514 /* Dont warn about a function declaration
1515 followed by a definition. */
1516 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1517 && DECL_INITIAL (olddecl) == 0))
1519 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1520 warning_with_decl (olddecl, "previous declaration of `%s'");
1523 /* Copy all the DECL_... slots specified in the new decl
1524 except for any that we copy here from the old type.
1526 Past this point, we don't change OLDTYPE and NEWTYPE
1527 even if we change the types of NEWDECL and OLDDECL. */
1531 /* Merge the data types specified in the two decls. */
1532 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1534 = TREE_TYPE (olddecl)
1535 = common_type (newtype, oldtype);
1537 /* Lay the type out, unless already done. */
1538 if (oldtype != TREE_TYPE (newdecl))
1540 if (TREE_TYPE (newdecl) != error_mark_node)
1541 layout_type (TREE_TYPE (newdecl));
1542 if (TREE_CODE (newdecl) != FUNCTION_DECL
1543 && TREE_CODE (newdecl) != TYPE_DECL
1544 && TREE_CODE (newdecl) != CONST_DECL)
1545 layout_decl (newdecl, 0);
1549 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1550 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1551 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1552 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1553 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1556 /* Keep the old rtl since we can safely use it. */
1557 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1559 /* Merge the type qualifiers. */
1560 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1561 && !TREE_THIS_VOLATILE (newdecl))
1562 TREE_THIS_VOLATILE (olddecl) = 0;
1563 if (TREE_READONLY (newdecl))
1564 TREE_READONLY (olddecl) = 1;
1565 if (TREE_THIS_VOLATILE (newdecl))
1567 TREE_THIS_VOLATILE (olddecl) = 1;
1568 if (TREE_CODE (newdecl) == VAR_DECL)
1569 make_var_volatile (newdecl);
1572 /* Keep source location of definition rather than declaration. */
1573 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1575 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1576 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1579 /* Merge the unused-warning information. */
1580 if (DECL_IN_SYSTEM_HEADER (olddecl))
1581 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1582 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1583 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1585 /* Merge the initialization information. */
1586 if (DECL_INITIAL (newdecl) == 0)
1587 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1589 /* If cannot merge, then use the new type and qualifiers,
1590 and don't preserve the old rtl. */
1593 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1594 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1595 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1596 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1599 /* Merge the storage class information. */
1600 /* For functions, static overrides non-static. */
1601 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1603 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1604 /* This is since we don't automatically
1605 copy the attributes of NEWDECL into OLDDECL. */
1606 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1607 /* If this clears `static', clear it in the identifier too. */
1608 if (! TREE_PUBLIC (olddecl))
1609 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1611 if (DECL_EXTERNAL (newdecl))
1613 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1614 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1615 /* An extern decl does not override previous storage class. */
1616 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1620 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1621 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1624 /* If either decl says `inline', this fn is inline,
1625 unless its definition was passed already. */
1626 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1627 DECL_INLINE (olddecl) = 1;
1628 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1630 /* Get rid of any built-in function if new arg types don't match it
1631 or if we have a function definition. */
1632 if (TREE_CODE (newdecl) == FUNCTION_DECL
1633 && DECL_BUILT_IN (olddecl)
1634 && (!types_match || new_is_definition))
1636 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1637 DECL_BUILT_IN (olddecl) = 0;
1640 /* If redeclaring a builtin function, and not a definition,
1642 Also preserve various other info from the definition. */
1643 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1645 if (DECL_BUILT_IN (olddecl))
1647 DECL_BUILT_IN (newdecl) = 1;
1648 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1651 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1653 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1654 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1655 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1656 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1659 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1660 But preserve OLDdECL's DECL_UID. */
1662 register unsigned olddecl_uid = DECL_UID (olddecl);
1664 bcopy ((char *) newdecl + sizeof (struct tree_common),
1665 (char *) olddecl + sizeof (struct tree_common),
1666 sizeof (struct tree_decl) - sizeof (struct tree_common));
1667 DECL_UID (olddecl) = olddecl_uid;
1673 /* Record a decl-node X as belonging to the current lexical scope.
1674 Check for errors (such as an incompatible declaration for the same
1675 name already seen in the same scope).
1677 Returns either X or an old decl for the same name.
1678 If an old decl is returned, it may have been smashed
1679 to agree with what X says. */
1686 register tree name = DECL_NAME (x);
1687 register struct binding_level *b = current_binding_level;
1689 DECL_CONTEXT (x) = current_function_decl;
1690 /* A local declaration for a function doesn't constitute nesting. */
1691 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0)
1692 DECL_CONTEXT (x) = 0;
1694 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1695 && x != IDENTIFIER_IMPLICIT_DECL (name))
1696 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1703 t = lookup_name_current_level (name);
1704 if (t != 0 && t == error_mark_node)
1705 /* error_mark_node is 0 for a while during initialization! */
1708 error_with_decl (x, "`%s' used prior to declaration");
1713 file = DECL_SOURCE_FILE (t);
1714 line = DECL_SOURCE_LINE (t);
1717 if (t != 0 && duplicate_decls (x, t))
1719 if (TREE_CODE (t) == PARM_DECL)
1721 /* Don't allow more than one "real" duplicate
1722 of a forward parm decl. */
1723 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1726 /* If this decl is `static' and an implicit decl was seen previously,
1727 warn. But don't complain if -traditional,
1728 since traditional compilers don't complain. */
1729 if (!flag_traditional && TREE_PUBLIC (name)
1730 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1731 /* We used to warn also for explicit extern followed by static,
1732 but sometimes you need to do it that way. */
1733 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1735 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1736 IDENTIFIER_POINTER (name));
1737 pedwarn_with_file_and_line (file, line,
1738 "previous declaration of `%s'",
1739 IDENTIFIER_POINTER (name));
1745 /* If we are processing a typedef statement, generate a whole new
1746 ..._TYPE node (which will be just an variant of the existing
1747 ..._TYPE node with identical properties) and then install the
1748 TYPE_DECL node generated to represent the typedef name as the
1749 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1751 The whole point here is to end up with a situation where each
1752 and every ..._TYPE node the compiler creates will be uniquely
1753 associated with AT MOST one node representing a typedef name.
1754 This way, even though the compiler substitutes corresponding
1755 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1756 early on, later parts of the compiler can always do the reverse
1757 translation and get back the corresponding typedef name. For
1760 typedef struct S MY_TYPE;
1763 Later parts of the compiler might only know that `object' was of
1764 type `struct S' if if were not for code just below. With this
1765 code however, later parts of the compiler see something like:
1767 struct S' == struct S
1768 typedef struct S' MY_TYPE;
1771 And they can then deduce (from the node for type struct S') that
1772 the original object declaration was:
1776 Being able to do this is important for proper support of protoize,
1777 and also for generating precise symbolic debugging information
1778 which takes full account of the programmer's (typedef) vocabulary.
1780 Obviously, we don't want to generate a duplicate ..._TYPE node if
1781 the TYPE_DECL node that we are now processing really represents a
1782 standard built-in type.
1784 Since all standard types are effectively declared at line zero
1785 in the source file, we can easily check to see if we are working
1786 on a standard type by checking the current value of lineno. */
1788 if (TREE_CODE (x) == TYPE_DECL)
1790 if (DECL_SOURCE_LINE (x) == 0)
1792 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1793 TYPE_NAME (TREE_TYPE (x)) = x;
1797 tree tt = TREE_TYPE (x);
1799 tt = build_type_copy (tt);
1805 /* Multiple external decls of the same identifier ought to match.
1806 Check against both global declarations and out of scope (limbo) block
1809 We get warnings about inline functions where they are defined.
1810 Avoid duplicate warnings where they are used. */
1811 if ((DECL_EXTERNAL (x) || TREE_PUBLIC (x)) && ! DECL_INLINE (x))
1815 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1816 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1817 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1818 decl = IDENTIFIER_GLOBAL_VALUE (name);
1819 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1820 /* Decls in limbo are always extern, so no need to check that. */
1821 decl = IDENTIFIER_LIMBO_VALUE (name);
1825 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1826 /* If old decl is built-in, we already warned if we should. */
1827 && !DECL_BUILT_IN (decl))
1829 pedwarn_with_decl (x,
1830 "type mismatch with previous external decl");
1831 pedwarn_with_decl (decl, "previous external decl of `%s'");
1835 /* If a function has had an implicit declaration, and then is defined,
1836 make sure they are compatible. */
1838 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1839 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1840 && TREE_CODE (x) == FUNCTION_DECL
1841 && ! comptypes (TREE_TYPE (x),
1842 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1844 warning_with_decl (x, "type mismatch with previous implicit declaration");
1845 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1846 "previous implicit declaration of `%s'");
1849 /* In PCC-compatibility mode, extern decls of vars with no current decl
1850 take effect at top level no matter where they are. */
1851 if (flag_traditional && DECL_EXTERNAL (x)
1852 && lookup_name (name) == 0)
1854 tree type = TREE_TYPE (x);
1856 /* But don't do this if the type contains temporary nodes. */
1859 if (type == error_mark_node)
1861 if (! TREE_PERMANENT (type))
1863 warning_with_decl (x, "type of external `%s' is not global");
1864 /* By exiting the loop early, we leave TYPE nonzero,
1865 and thus prevent globalization of the decl. */
1868 else if (TREE_CODE (type) == FUNCTION_TYPE
1869 && TYPE_ARG_TYPES (type) != 0)
1870 /* The types might not be truly local,
1871 but the list of arg types certainly is temporary.
1872 Since prototypes are nontraditional,
1873 ok not to do the traditional thing. */
1875 type = TREE_TYPE (type);
1879 b = global_binding_level;
1882 /* This name is new in its binding level.
1883 Install the new declaration and return it. */
1884 if (b == global_binding_level)
1886 /* Install a global value. */
1888 /* If the first global decl has external linkage,
1889 warn if we later see static one. */
1890 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1891 TREE_PUBLIC (name) = 1;
1893 IDENTIFIER_GLOBAL_VALUE (name) = x;
1895 /* We no longer care about any previous block level declarations. */
1896 IDENTIFIER_LIMBO_VALUE (name) = 0;
1898 /* Don't forget if the function was used via an implicit decl. */
1899 if (IDENTIFIER_IMPLICIT_DECL (name)
1900 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1901 TREE_USED (x) = 1, TREE_USED (name) = 1;
1903 /* Don't forget if its address was taken in that way. */
1904 if (IDENTIFIER_IMPLICIT_DECL (name)
1905 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1906 TREE_ADDRESSABLE (x) = 1;
1908 /* Warn about mismatches against previous implicit decl. */
1909 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1910 /* If this real decl matches the implicit, don't complain. */
1911 && ! (TREE_CODE (x) == FUNCTION_DECL
1912 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1913 == integer_type_node)))
1914 pedwarn ("`%s' was previously implicitly declared to return `int'",
1915 IDENTIFIER_POINTER (name));
1917 /* If this decl is `static' and an `extern' was seen previously,
1918 that is erroneous. */
1919 if (TREE_PUBLIC (name)
1920 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1922 /* Okay to redeclare an ANSI built-in as static. */
1923 if (t != 0 && DECL_BUILT_IN (t))
1925 /* Okay to declare a non-ANSI built-in as anything. */
1926 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1928 else if (IDENTIFIER_IMPLICIT_DECL (name))
1929 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1930 IDENTIFIER_POINTER (name));
1932 pedwarn ("`%s' was declared `extern' and later `static'",
1933 IDENTIFIER_POINTER (name));
1938 /* Here to install a non-global value. */
1939 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
1940 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
1941 IDENTIFIER_LOCAL_VALUE (name) = x;
1943 /* If this is an extern function declaration, see if we
1944 have a global definition or declaration for the function. */
1946 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
1948 && TREE_CODE (x) == FUNCTION_DECL
1949 && TREE_CODE (oldglobal) == FUNCTION_DECL)
1951 /* We have one. Their types must agree. */
1952 if (! comptypes (TREE_TYPE (x),
1953 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
1954 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
1957 /* Inner extern decl is inline if global one is.
1958 Copy enough to really inline it. */
1959 if (DECL_INLINE (oldglobal))
1961 DECL_INLINE (x) = DECL_INLINE (oldglobal);
1962 DECL_INITIAL (x) = (current_function_decl == oldglobal
1963 ? 0 : DECL_INITIAL (oldglobal));
1964 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
1965 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
1966 DECL_RESULT (x) = DECL_RESULT (oldglobal);
1967 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
1968 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
1970 /* Inner extern decl is built-in if global one is. */
1971 if (DECL_BUILT_IN (oldglobal))
1973 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
1974 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
1976 /* Keep the arg types from a file-scope fcn defn. */
1977 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
1978 && DECL_INITIAL (oldglobal)
1979 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
1980 TREE_TYPE (x) = TREE_TYPE (oldglobal);
1984 #if 0 /* This case is probably sometimes the right thing to do. */
1985 /* If we have a local external declaration,
1986 then any file-scope declaration should not
1987 have been static. */
1988 if (oldlocal == 0 && oldglobal != 0
1989 && !TREE_PUBLIC (oldglobal)
1990 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1991 warning ("`%s' locally external but globally static",
1992 IDENTIFIER_POINTER (name));
1995 /* If we have a local external declaration,
1996 and no file-scope declaration has yet been seen,
1997 then if we later have a file-scope decl it must not be static. */
2000 && DECL_EXTERNAL (x)
2003 TREE_PUBLIC (name) = 1;
2005 /* Save this decl, so that we can do type checking against
2006 other decls after it falls out of scope.
2008 Only save it once. This prevents temporary decls created in
2009 expand_inline_function from being used here, since this
2010 will have been set when the inline function was parsed.
2011 It also helps give slightly better warnings. */
2012 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2013 IDENTIFIER_LIMBO_VALUE (name) = x;
2016 /* Warn if shadowing an argument at the top level of the body. */
2017 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2018 /* This warning doesn't apply to the parms of a nested fcn. */
2019 && ! current_binding_level->parm_flag
2020 /* Check that this is one level down from the parms. */
2021 && current_binding_level->level_chain->parm_flag
2022 /* Check that the decl being shadowed
2023 comes from the parm level, one level up. */
2024 && chain_member (oldlocal, current_binding_level->level_chain->names))
2026 if (TREE_CODE (oldlocal) == PARM_DECL)
2027 pedwarn ("declaration of `%s' shadows a parameter",
2028 IDENTIFIER_POINTER (name));
2030 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2031 IDENTIFIER_POINTER (name));
2034 /* Maybe warn if shadowing something else. */
2035 else if (warn_shadow && !DECL_EXTERNAL (x)
2036 /* No shadow warnings for internally generated vars. */
2037 && DECL_SOURCE_LINE (x) != 0
2038 /* No shadow warnings for vars made for inlining. */
2039 && ! DECL_FROM_INLINE (x))
2041 char *warnstring = 0;
2043 if (TREE_CODE (x) == PARM_DECL
2044 && current_binding_level->parm_flag == 1)
2045 /* Don't warn about the parm names in a declaration. */
2047 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2048 warnstring = "declaration of `%s' shadows a parameter";
2049 else if (oldlocal != 0)
2050 warnstring = "declaration of `%s' shadows previous local";
2051 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2052 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2053 warnstring = "declaration of `%s' shadows global declaration";
2056 warning (warnstring, IDENTIFIER_POINTER (name));
2059 /* If storing a local value, there may already be one (inherited).
2060 If so, record it for restoration when this binding level ends. */
2062 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2065 /* Keep count of variables in this level with incomplete type. */
2066 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2070 /* Put decls on list in reverse order.
2071 We will reverse them later if necessary. */
2072 TREE_CHAIN (x) = b->names;
2078 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2081 pushdecl_top_level (x)
2085 register struct binding_level *b = current_binding_level;
2087 current_binding_level = global_binding_level;
2089 current_binding_level = b;
2093 /* Generate an implicit declaration for identifier FUNCTIONID
2094 as a function of type int (). Print a warning if appropriate. */
2097 implicitly_declare (functionid)
2101 int traditional_warning = 0;
2102 /* Only one "implicit declaration" warning per identifier. */
2103 int implicit_warning;
2105 /* Save the decl permanently so we can warn if definition follows. */
2106 push_obstacks_nochange ();
2107 end_temporary_allocation ();
2109 /* We used to reuse an old implicit decl here,
2110 but this loses with inline functions because it can clobber
2111 the saved decl chains. */
2112 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2113 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2115 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2117 /* Warn of implicit decl following explicit local extern decl.
2118 This is probably a program designed for traditional C. */
2119 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2120 traditional_warning = 1;
2122 /* Warn once of an implicit declaration. */
2123 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2125 DECL_EXTERNAL (decl) = 1;
2126 TREE_PUBLIC (decl) = 1;
2128 /* Record that we have an implicit decl and this is it. */
2129 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2131 /* ANSI standard says implicit declarations are in the innermost block.
2132 So we record the decl in the standard fashion.
2133 If flag_traditional is set, pushdecl does it top-level. */
2136 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2137 maybe_objc_check_decl (decl);
2139 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2141 if (warn_implicit && implicit_warning)
2142 warning ("implicit declaration of function `%s'",
2143 IDENTIFIER_POINTER (functionid));
2144 else if (warn_traditional && traditional_warning)
2145 warning ("function `%s' was previously declared within a block",
2146 IDENTIFIER_POINTER (functionid));
2148 /* Write a record describing this implicit function declaration to the
2149 prototypes file (if requested). */
2151 gen_aux_info_record (decl, 0, 1, 0);
2158 /* Return zero if the declaration NEWDECL is valid
2159 when the declaration OLDDECL (assumed to be for the same name)
2160 has already been seen.
2161 Otherwise return an error message format string with a %s
2162 where the identifier should go. */
2165 redeclaration_error_message (newdecl, olddecl)
2166 tree newdecl, olddecl;
2168 if (TREE_CODE (newdecl) == TYPE_DECL)
2170 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2172 return "redefinition of `%s'";
2174 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2176 /* Declarations of functions can insist on internal linkage
2177 but they can't be inconsistent with internal linkage,
2178 so there can be no error on that account.
2179 However defining the same name twice is no good. */
2180 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2181 /* However, defining once as extern inline and a second
2182 time in another way is ok. */
2183 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2184 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2185 return "redefinition of `%s'";
2188 else if (current_binding_level == global_binding_level)
2190 /* Objects declared at top level: */
2191 /* If at least one is a reference, it's ok. */
2192 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2194 /* Reject two definitions. */
2195 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2196 return "redefinition of `%s'";
2197 /* Now we have two tentative defs, or one tentative and one real def. */
2198 /* Insist that the linkage match. */
2199 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2200 return "conflicting declarations of `%s'";
2203 else if (current_binding_level->parm_flag
2204 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2208 /* Objects declared with block scope: */
2209 /* Reject two definitions, and reject a definition
2210 together with an external reference. */
2211 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2212 return "redeclaration of `%s'";
2217 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2218 Create one if none exists so far for the current function.
2219 This function is called for both label definitions and label references. */
2225 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2227 if (current_function_decl == 0)
2229 error ("label %s referenced outside of any function",
2230 IDENTIFIER_POINTER (id));
2234 /* Use a label already defined or ref'd with this name. */
2237 /* But not if it is inherited and wasn't declared to be inheritable. */
2238 if (DECL_CONTEXT (decl) != current_function_decl
2239 && ! C_DECLARED_LABEL_FLAG (decl))
2240 return shadow_label (id);
2244 decl = build_decl (LABEL_DECL, id, void_type_node);
2246 /* Make sure every label has an rtx. */
2249 /* A label not explicitly declared must be local to where it's ref'd. */
2250 DECL_CONTEXT (decl) = current_function_decl;
2252 DECL_MODE (decl) = VOIDmode;
2254 /* Say where one reference is to the label,
2255 for the sake of the error if it is not defined. */
2256 DECL_SOURCE_LINE (decl) = lineno;
2257 DECL_SOURCE_FILE (decl) = input_filename;
2259 IDENTIFIER_LABEL_VALUE (id) = decl;
2261 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2266 /* Make a label named NAME in the current function,
2267 shadowing silently any that may be inherited from containing functions
2268 or containing scopes.
2270 Note that valid use, if the label being shadowed
2271 comes from another scope in the same function,
2272 requires calling declare_nonlocal_label right away. */
2278 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2282 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2283 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2286 return lookup_label (name);
2289 /* Define a label, specifying the location in the source file.
2290 Return the LABEL_DECL node for the label, if the definition is valid.
2291 Otherwise return 0. */
2294 define_label (filename, line, name)
2299 tree decl = lookup_label (name);
2301 /* If label with this name is known from an outer context, shadow it. */
2302 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2304 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2305 IDENTIFIER_LABEL_VALUE (name) = 0;
2306 decl = lookup_label (name);
2309 if (DECL_INITIAL (decl) != 0)
2311 error_with_decl (decl, "duplicate label `%s'");
2316 /* Mark label as having been defined. */
2317 DECL_INITIAL (decl) = error_mark_node;
2318 /* Say where in the source. */
2319 DECL_SOURCE_FILE (decl) = filename;
2320 DECL_SOURCE_LINE (decl) = line;
2325 /* Return the list of declarations of the current level.
2326 Note that this list is in reverse order unless/until
2327 you nreverse it; and when you do nreverse it, you must
2328 store the result back using `storedecls' or you will lose. */
2333 return current_binding_level->names;
2336 /* Return the list of type-tags (for structs, etc) of the current level. */
2341 return current_binding_level->tags;
2344 /* Store the list of declarations of the current level.
2345 This is done for the parameter declarations of a function being defined,
2346 after they are modified in the light of any missing parameters. */
2352 current_binding_level->names = decls;
2355 /* Similarly, store the list of tags of the current level. */
2361 current_binding_level->tags = tags;
2364 /* Given NAME, an IDENTIFIER_NODE,
2365 return the structure (or union or enum) definition for that name.
2366 Searches binding levels from BINDING_LEVEL up to the global level.
2367 If THISLEVEL_ONLY is nonzero, searches only the specified context
2368 (but skips any tag-transparent contexts to find one that is
2369 meaningful for tags).
2370 CODE says which kind of type the caller wants;
2371 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2372 If the wrong kind of type is found, an error is reported. */
2375 lookup_tag (code, name, binding_level, thislevel_only)
2376 enum tree_code code;
2377 struct binding_level *binding_level;
2381 register struct binding_level *level;
2383 for (level = binding_level; level; level = level->level_chain)
2386 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2388 if (TREE_PURPOSE (tail) == name)
2390 if (TREE_CODE (TREE_VALUE (tail)) != code)
2392 /* Definition isn't the kind we were looking for. */
2393 pending_invalid_xref = name;
2394 pending_invalid_xref_file = input_filename;
2395 pending_invalid_xref_line = lineno;
2397 return TREE_VALUE (tail);
2400 if (thislevel_only && ! level->tag_transparent)
2406 /* Print an error message now
2407 for a recent invalid struct, union or enum cross reference.
2408 We don't print them immediately because they are not invalid
2409 when used in the `struct foo;' construct for shadowing. */
2412 pending_xref_error ()
2414 if (pending_invalid_xref != 0)
2415 error_with_file_and_line (pending_invalid_xref_file,
2416 pending_invalid_xref_line,
2417 "`%s' defined as wrong kind of tag",
2418 IDENTIFIER_POINTER (pending_invalid_xref));
2419 pending_invalid_xref = 0;
2422 /* Given a type, find the tag that was defined for it and return the tag name.
2423 Otherwise return 0. */
2426 lookup_tag_reverse (type)
2429 register struct binding_level *level;
2431 for (level = current_binding_level; level; level = level->level_chain)
2434 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2436 if (TREE_VALUE (tail) == type)
2437 return TREE_PURPOSE (tail);
2443 /* Look up NAME in the current binding level and its superiors
2444 in the namespace of variables, functions and typedefs.
2445 Return a ..._DECL node of some kind representing its definition,
2446 or return 0 if it is undefined. */
2453 if (current_binding_level != global_binding_level
2454 && IDENTIFIER_LOCAL_VALUE (name))
2455 val = IDENTIFIER_LOCAL_VALUE (name);
2457 val = IDENTIFIER_GLOBAL_VALUE (name);
2461 /* Similar to `lookup_name' but look only at current binding level. */
2464 lookup_name_current_level (name)
2469 if (current_binding_level == global_binding_level)
2470 return IDENTIFIER_GLOBAL_VALUE (name);
2472 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2475 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2476 if (DECL_NAME (t) == name)
2482 /* Create the predefined scalar types of C,
2483 and some nodes representing standard constants (0, 1, (void *)0).
2484 Initialize the global binding level.
2485 Make definitions for built-in primitive functions. */
2488 init_decl_processing ()
2490 register tree endlink;
2491 /* Either char* or void*. */
2492 tree traditional_ptr_type_node;
2493 /* Data types of memcpy and strlen. */
2494 tree memcpy_ftype, strlen_ftype;
2495 tree void_ftype_any;
2496 int wchar_type_size;
2499 current_function_decl = NULL;
2500 named_labels = NULL;
2501 current_binding_level = NULL_BINDING_LEVEL;
2502 free_binding_level = NULL_BINDING_LEVEL;
2503 pushlevel (0); /* make the binding_level structure for global names */
2504 global_binding_level = current_binding_level;
2506 /* Define `int' and `char' first so that dbx will output them first. */
2508 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2509 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2510 integer_type_node));
2512 /* Define `char', which is like either `signed char' or `unsigned char'
2513 but not the same as either. */
2517 ? make_signed_type (CHAR_TYPE_SIZE)
2518 : make_unsigned_type (CHAR_TYPE_SIZE));
2519 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2522 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2523 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2524 long_integer_type_node));
2526 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2527 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2528 unsigned_type_node));
2530 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2531 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2532 long_unsigned_type_node));
2534 /* `unsigned long' is the standard type for sizeof.
2535 Traditionally, use a signed type.
2536 Note that stddef.h uses `unsigned long',
2537 and this must agree, even of long and int are the same size. */
2538 if (flag_traditional)
2539 sizetype = long_integer_type_node;
2542 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2545 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2547 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2548 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2549 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2550 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2551 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2553 error_mark_node = make_node (ERROR_MARK);
2554 TREE_TYPE (error_mark_node) = error_mark_node;
2556 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2557 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2558 short_integer_type_node));
2560 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2561 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2562 long_long_integer_type_node));
2564 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2565 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2566 short_unsigned_type_node));
2568 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2569 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2570 long_long_unsigned_type_node));
2572 /* Define both `signed char' and `unsigned char'. */
2573 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2574 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2575 signed_char_type_node));
2577 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2578 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2579 unsigned_char_type_node));
2581 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2582 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2584 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2585 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2587 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2588 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2590 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2591 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2593 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2594 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2596 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2597 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2599 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2600 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2602 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2603 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2605 float_type_node = make_node (REAL_TYPE);
2606 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2607 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2609 layout_type (float_type_node);
2611 double_type_node = make_node (REAL_TYPE);
2612 if (flag_short_double)
2613 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2615 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2616 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2618 layout_type (double_type_node);
2620 long_double_type_node = make_node (REAL_TYPE);
2621 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2622 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2623 long_double_type_node));
2624 layout_type (long_double_type_node);
2627 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2628 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2629 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2630 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2632 integer_zero_node = build_int_2 (0, 0);
2633 TREE_TYPE (integer_zero_node) = integer_type_node;
2634 integer_one_node = build_int_2 (1, 0);
2635 TREE_TYPE (integer_one_node) = integer_type_node;
2637 size_zero_node = build_int_2 (0, 0);
2638 TREE_TYPE (size_zero_node) = sizetype;
2639 size_one_node = build_int_2 (1, 0);
2640 TREE_TYPE (size_one_node) = sizetype;
2642 void_type_node = make_node (VOID_TYPE);
2643 pushdecl (build_decl (TYPE_DECL,
2644 ridpointers[(int) RID_VOID], void_type_node));
2645 layout_type (void_type_node); /* Uses integer_zero_node */
2646 /* We are not going to have real types in C with less than byte alignment,
2647 so we might as well not have any types that claim to have it. */
2648 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2650 null_pointer_node = build_int_2 (0, 0);
2651 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2652 layout_type (TREE_TYPE (null_pointer_node));
2654 string_type_node = build_pointer_type (char_type_node);
2655 const_string_type_node
2656 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2658 /* make a type for arrays of 256 characters.
2659 256 is picked randomly because we have a type for integers from 0 to 255.
2660 With luck nothing will ever really depend on the length of this
2662 char_array_type_node
2663 = build_array_type (char_type_node, unsigned_intQI_type_node);
2664 /* Likewise for arrays of ints. */
2666 = build_array_type (integer_type_node, unsigned_intQI_type_node);
2667 /* This is for wide string constants. */
2668 wchar_array_type_node
2669 = build_array_type (wchar_type_node, unsigned_intQI_type_node);
2671 default_function_type
2672 = build_function_type (integer_type_node, NULL_TREE);
2674 ptr_type_node = build_pointer_type (void_type_node);
2676 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2678 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2681 = build_function_type (void_type_node, NULL_TREE);
2684 = build_function_type (double_type_node,
2685 tree_cons (NULL_TREE, double_type_node, endlink));
2687 double_ftype_double_double
2688 = build_function_type (double_type_node,
2689 tree_cons (NULL_TREE, double_type_node,
2690 tree_cons (NULL_TREE,
2691 double_type_node, endlink)));
2694 = build_function_type (integer_type_node,
2695 tree_cons (NULL_TREE, integer_type_node, endlink));
2698 = build_function_type (long_integer_type_node,
2699 tree_cons (NULL_TREE,
2700 long_integer_type_node, endlink));
2702 void_ftype_ptr_ptr_int
2703 = build_function_type (void_type_node,
2704 tree_cons (NULL_TREE, ptr_type_node,
2705 tree_cons (NULL_TREE, ptr_type_node,
2706 tree_cons (NULL_TREE,
2710 int_ftype_cptr_cptr_sizet
2711 = build_function_type (integer_type_node,
2712 tree_cons (NULL_TREE, const_ptr_type_node,
2713 tree_cons (NULL_TREE, const_ptr_type_node,
2714 tree_cons (NULL_TREE,
2718 void_ftype_ptr_int_int
2719 = build_function_type (void_type_node,
2720 tree_cons (NULL_TREE, ptr_type_node,
2721 tree_cons (NULL_TREE, integer_type_node,
2722 tree_cons (NULL_TREE,
2726 string_ftype_ptr_ptr /* strcpy prototype */
2727 = build_function_type (string_type_node,
2728 tree_cons (NULL_TREE, string_type_node,
2729 tree_cons (NULL_TREE,
2730 const_string_type_node,
2733 int_ftype_string_string /* strcmp prototype */
2734 = build_function_type (integer_type_node,
2735 tree_cons (NULL_TREE, const_string_type_node,
2736 tree_cons (NULL_TREE,
2737 const_string_type_node,
2740 strlen_ftype /* strlen prototype */
2741 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2742 tree_cons (NULL_TREE, const_string_type_node,
2745 traditional_ptr_type_node
2746 = (flag_traditional ? string_type_node : ptr_type_node);
2748 memcpy_ftype /* memcpy prototype */
2749 = build_function_type (traditional_ptr_type_node,
2750 tree_cons (NULL_TREE, ptr_type_node,
2751 tree_cons (NULL_TREE, const_ptr_type_node,
2752 tree_cons (NULL_TREE,
2756 builtin_function ("__builtin_constant_p", int_ftype_int,
2757 BUILT_IN_CONSTANT_P, NULL_PTR);
2759 builtin_function ("__builtin_return_address",
2760 build_function_type (ptr_type_node,
2761 tree_cons (NULL_TREE,
2764 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2766 builtin_function ("__builtin_frame_address",
2767 build_function_type (ptr_type_node,
2768 tree_cons (NULL_TREE,
2771 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2773 builtin_function ("__builtin_alloca",
2774 build_function_type (ptr_type_node,
2775 tree_cons (NULL_TREE,
2778 BUILT_IN_ALLOCA, "alloca");
2779 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2780 /* Define alloca, ffs as builtins.
2781 Declare _exit just to mark it as volatile. */
2782 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2784 temp = builtin_function ("alloca",
2785 build_function_type (ptr_type_node,
2786 tree_cons (NULL_TREE,
2789 BUILT_IN_ALLOCA, NULL_PTR);
2790 /* Suppress error if redefined as a non-function. */
2791 DECL_BUILT_IN_NONANSI (temp) = 1;
2792 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2793 /* Suppress error if redefined as a non-function. */
2794 DECL_BUILT_IN_NONANSI (temp) = 1;
2795 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2797 TREE_THIS_VOLATILE (temp) = 1;
2798 TREE_SIDE_EFFECTS (temp) = 1;
2799 /* Suppress error if redefined as a non-function. */
2800 DECL_BUILT_IN_NONANSI (temp) = 1;
2803 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2804 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2806 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2808 builtin_function ("__builtin_saveregs",
2809 build_function_type (ptr_type_node, NULL_TREE),
2810 BUILT_IN_SAVEREGS, NULL_PTR);
2811 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2813 builtin_function ("__builtin_varargs",
2814 build_function_type (ptr_type_node,
2815 tree_cons (NULL_TREE,
2818 BUILT_IN_VARARGS, NULL_PTR);
2820 builtin_function ("__builtin_classify_type", default_function_type,
2821 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2822 builtin_function ("__builtin_next_arg",
2823 build_function_type (ptr_type_node, endlink),
2824 BUILT_IN_NEXT_ARG, NULL_PTR);
2825 builtin_function ("__builtin_args_info",
2826 build_function_type (integer_type_node,
2827 tree_cons (NULL_TREE,
2830 BUILT_IN_ARGS_INFO, NULL_PTR);
2832 /* Currently under experimentation. */
2833 builtin_function ("__builtin_memcpy", memcpy_ftype,
2834 BUILT_IN_MEMCPY, "memcpy");
2835 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2836 BUILT_IN_MEMCMP, "memcmp");
2837 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2838 BUILT_IN_STRCMP, "strcmp");
2839 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2840 BUILT_IN_STRCPY, "strcpy");
2841 builtin_function ("__builtin_strlen", strlen_ftype,
2842 BUILT_IN_STRLEN, "strlen");
2843 builtin_function ("__builtin_fsqrt", double_ftype_double,
2844 BUILT_IN_FSQRT, "sqrt");
2845 builtin_function ("__builtin_sin", double_ftype_double,
2846 BUILT_IN_SIN, "sin");
2847 builtin_function ("__builtin_cos", double_ftype_double,
2848 BUILT_IN_COS, "cos");
2850 /* In an ANSI C program, it is okay to supply built-in meanings
2851 for these functions, since applications cannot validly use them
2852 with any other meaning.
2853 However, honor the -fno-builtin option. */
2854 if (!flag_no_builtin)
2856 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2857 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
2858 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
2859 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
2860 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
2862 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
2864 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
2866 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
2867 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
2868 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
2869 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
2871 /* Declare these functions volatile
2872 to avoid spurious "control drops through" warnings. */
2873 /* Don't specify the argument types, to avoid errors
2874 from certain code which isn't valid in ANSI but which exists. */
2875 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
2877 TREE_THIS_VOLATILE (temp) = 1;
2878 TREE_SIDE_EFFECTS (temp) = 1;
2879 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
2880 TREE_THIS_VOLATILE (temp) = 1;
2881 TREE_SIDE_EFFECTS (temp) = 1;
2885 /* Support for these has not been written in either expand_builtin
2886 or build_function_call. */
2887 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
2888 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
2889 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
2891 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
2893 builtin_function ("__builtin_fmod", double_ftype_double_double,
2894 BUILT_IN_FMOD, NULL_PTR);
2895 builtin_function ("__builtin_frem", double_ftype_double_double,
2896 BUILT_IN_FREM, NULL_PTR);
2897 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
2898 BUILT_IN_MEMSET, NULL_PTR);
2899 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
2901 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
2905 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
2906 declare_function_name ();
2908 start_identifier_warnings ();
2910 init_format_info_table ();
2913 /* Return a definition for a builtin function named NAME and whose data type
2914 is TYPE. TYPE should be a function type with argument types.
2915 FUNCTION_CODE tells later passes how to compile calls to this function.
2916 See tree.h for its possible values.
2918 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2919 the name to be called if we can't opencode the function. */
2922 builtin_function (name, type, function_code, library_name)
2925 enum built_in_function function_code;
2928 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2929 DECL_EXTERNAL (decl) = 1;
2930 TREE_PUBLIC (decl) = 1;
2931 /* If -traditional, permit redefining a builtin function any way you like.
2932 (Though really, if the program redefines these functions,
2933 it probably won't work right unless compiled with -fno-builtin.) */
2934 if (flag_traditional && name[0] != '_')
2935 DECL_BUILT_IN_NONANSI (decl) = 1;
2937 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
2938 make_decl_rtl (decl, NULL_PTR, 1);
2940 if (function_code != NOT_BUILT_IN)
2942 DECL_BUILT_IN (decl) = 1;
2943 DECL_SET_FUNCTION_CODE (decl, function_code);
2945 /* Warn if a function in the namespace for users
2946 is used without an occasion to consider it declared. */
2947 if (name[0] != '_' || name[1] != '_')
2948 C_DECL_ANTICIPATED (decl) = 1;
2953 /* Called when a declaration is seen that contains no names to declare.
2954 If its type is a reference to a structure, union or enum inherited
2955 from a containing scope, shadow that tag name for the current scope
2956 with a forward reference.
2957 If its type defines a new named structure or union
2958 or defines an enum, it is valid but we need not do anything here.
2959 Otherwise, it is an error. */
2962 shadow_tag (declspecs)
2965 shadow_tag_warned (declspecs, 0);
2969 shadow_tag_warned (declspecs, warned)
2976 pending_invalid_xref = 0;
2978 for (link = declspecs; link; link = TREE_CHAIN (link))
2980 register tree value = TREE_VALUE (link);
2981 register enum tree_code code = TREE_CODE (value);
2983 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2984 /* Used to test also that TYPE_SIZE (value) != 0.
2985 That caused warning for `struct foo;' at top level in the file. */
2987 register tree name = lookup_tag_reverse (value);
2994 if (!warned && code != ENUMERAL_TYPE) /* Empty unnamed enum OK */
2996 pedwarn ("unnamed struct/union that defines no instances");
3002 t = lookup_tag (code, name, current_binding_level, 1);
3006 t = make_node (code);
3014 pedwarn ("useless keyword or type name in empty declaration");
3022 error ("two types specified in one empty declaration");
3024 pedwarn ("empty declaration");
3028 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3031 groktypename (typename)
3034 if (TREE_CODE (typename) != TREE_LIST)
3036 return grokdeclarator (TREE_VALUE (typename),
3037 TREE_PURPOSE (typename),
3041 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3044 groktypename_in_parm_context (typename)
3047 if (TREE_CODE (typename) != TREE_LIST)
3049 return grokdeclarator (TREE_VALUE (typename),
3050 TREE_PURPOSE (typename),
3054 /* Decode a declarator in an ordinary declaration or data definition.
3055 This is called as soon as the type information and variable name
3056 have been parsed, before parsing the initializer if any.
3057 Here we create the ..._DECL node, fill in its type,
3058 and put it on the list of decls for the current context.
3059 The ..._DECL node is returned as the value.
3061 Exception: for arrays where the length is not specified,
3062 the type is left null, to be filled in by `finish_decl'.
3064 Function definitions do not come here; they go to start_function
3065 instead. However, external and forward declarations of functions
3066 do go through here. Structure field declarations are done by
3067 grokfield and not through here. */
3069 /* Set this to zero to debug not using the temporary obstack
3070 to parse initializers. */
3071 int debug_temp_inits = 1;
3074 start_decl (declarator, declspecs, initialized)
3075 tree declarator, declspecs;
3078 register tree decl = grokdeclarator (declarator, declspecs,
3079 NORMAL, initialized);
3081 int init_written = initialized;
3083 /* The corresponding pop_obstacks is in finish_decl. */
3084 push_obstacks_nochange ();
3087 /* Is it valid for this decl to have an initializer at all?
3088 If not, set INITIALIZED to zero, which will indirectly
3089 tell `finish_decl' to ignore the initializer once it is parsed. */
3090 switch (TREE_CODE (decl))
3093 /* typedef foo = bar means give foo the same type as bar.
3094 We haven't parsed bar yet, so `finish_decl' will fix that up.
3095 Any other case of an initialization in a TYPE_DECL is an error. */
3096 if (pedantic || list_length (declspecs) > 1)
3098 error ("typedef `%s' is initialized",
3099 IDENTIFIER_POINTER (DECL_NAME (decl)));
3105 error ("function `%s' is initialized like a variable",
3106 IDENTIFIER_POINTER (DECL_NAME (decl)));
3111 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3112 error ("parameter `%s' is initialized",
3113 IDENTIFIER_POINTER (DECL_NAME (decl)));
3118 /* Don't allow initializations for incomplete types
3119 except for arrays which might be completed by the initialization. */
3120 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3122 /* A complete type is ok if size is fixed. */
3124 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3125 || C_DECL_VARIABLE_SIZE (decl))
3127 error ("variable-sized object may not be initialized");
3131 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3133 error ("variable `%s' has initializer but incomplete type",
3134 IDENTIFIER_POINTER (DECL_NAME (decl)));
3137 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3139 error ("elements of array `%s' have incomplete type",
3140 IDENTIFIER_POINTER (DECL_NAME (decl)));
3147 #if 0 /* Seems redundant with grokdeclarator. */
3148 if (current_binding_level != global_binding_level
3149 && DECL_EXTERNAL (decl)
3150 && TREE_CODE (decl) != FUNCTION_DECL)
3151 warning ("declaration of `%s' has `extern' and is initialized",
3152 IDENTIFIER_POINTER (DECL_NAME (decl)));
3154 DECL_EXTERNAL (decl) = 0;
3155 if (current_binding_level == global_binding_level)
3156 TREE_STATIC (decl) = 1;
3158 /* Tell `pushdecl' this is an initialized decl
3159 even though we don't yet have the initializer expression.
3160 Also tell `finish_decl' it may store the real initializer. */
3161 DECL_INITIAL (decl) = error_mark_node;
3164 /* If this is a function declaration, write a record describing it to the
3165 prototypes file (if requested). */
3167 if (TREE_CODE (decl) == FUNCTION_DECL)
3168 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3170 /* Add this decl to the current binding level.
3171 TEM may equal DECL or it may be a previous decl of the same name. */
3172 tem = pushdecl (decl);
3174 /* For a local variable, define the RTL now. */
3175 if (current_binding_level != global_binding_level
3176 /* But not if this is a duplicate decl
3177 and we preserved the rtl from the previous one
3178 (which may or may not happen). */
3179 && DECL_RTL (tem) == 0)
3181 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3183 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3184 && DECL_INITIAL (tem) != 0)
3190 /* When parsing and digesting the initializer,
3191 use temporary storage. Do this even if we will ignore the value. */
3192 if (current_binding_level == global_binding_level && debug_temp_inits)
3193 temporary_allocation ();
3199 /* Finish processing of a declaration;
3200 install its initial value.
3201 If the length of an array type is not known before,
3202 it must be determined now, from the initial value, or it is an error. */
3205 finish_decl (decl, init, asmspec_tree)
3209 register tree type = TREE_TYPE (decl);
3210 int was_incomplete = (DECL_SIZE (decl) == 0);
3211 int temporary = allocation_temporary_p ();
3215 asmspec = TREE_STRING_POINTER (asmspec_tree);
3217 /* If `start_decl' didn't like having an initialization, ignore it now. */
3219 if (init != 0 && DECL_INITIAL (decl) == 0)
3221 /* Don't crash if parm is initialized. */
3222 if (TREE_CODE (decl) == PARM_DECL)
3227 if (TREE_CODE (decl) != TYPE_DECL)
3228 store_init_value (decl, init);
3231 /* typedef foo = bar; store the type of bar as the type of foo. */
3232 TREE_TYPE (decl) = TREE_TYPE (init);
3233 DECL_INITIAL (decl) = init = 0;
3237 /* Pop back to the obstack that is current for this binding level.
3238 This is because MAXINDEX, rtl, etc. to be made below
3239 must go in the permanent obstack. But don't discard the
3240 temporary data yet. */
3242 #if 0 /* pop_obstacks was near the end; this is what was here. */
3243 if (current_binding_level == global_binding_level && temporary)
3244 end_temporary_allocation ();
3247 /* Deduce size of array from initialization, if not already known */
3249 if (TREE_CODE (type) == ARRAY_TYPE
3250 && TYPE_DOMAIN (type) == 0
3251 && TREE_CODE (decl) != TYPE_DECL)
3254 = (TREE_STATIC (decl)
3255 /* Even if pedantic, an external linkage array
3256 may have incomplete type at first. */
3257 ? pedantic && !TREE_PUBLIC (decl)
3258 : !DECL_EXTERNAL (decl));
3260 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3262 /* Get the completed type made by complete_array_type. */
3263 type = TREE_TYPE (decl);
3266 error_with_decl (decl, "initializer fails to determine size of `%s'");
3271 error_with_decl (decl, "array size missing in `%s'");
3272 else if (!pedantic && TREE_STATIC (decl))
3273 DECL_EXTERNAL (decl) = 1;
3276 if (pedantic && TYPE_DOMAIN (type) != 0
3277 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3279 error_with_decl (decl, "zero-size array `%s'");
3281 layout_decl (decl, 0);
3284 if (TREE_CODE (decl) == VAR_DECL)
3286 if (DECL_SIZE (decl) == 0
3287 && (TREE_STATIC (decl)
3289 /* A static variable with an incomplete type
3290 is an error if it is initialized or `static'.
3291 Otherwise, let it through, but if it is not `extern'
3292 then it may cause an error message later. */
3293 !TREE_PUBLIC (decl) || DECL_INITIAL (decl)
3295 /* An automatic variable with an incomplete type
3297 !DECL_EXTERNAL (decl)))
3299 error_with_decl (decl, "storage size of `%s' isn't known");
3300 TREE_TYPE (decl) = error_mark_node;
3303 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3304 && DECL_SIZE (decl) != 0
3305 && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
3306 error_with_decl (decl, "storage size of `%s' isn't constant");
3309 /* Output the assembler code and/or RTL code for variables and functions,
3310 unless the type is an undefined structure or union.
3311 If not, it will get done when the type is completed. */
3313 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3315 if (flag_traditional && allocation_temporary_p ())
3317 push_obstacks_nochange ();
3318 end_temporary_allocation ();
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,
3328 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3329 maybe_objc_check_decl (decl);
3330 rest_of_decl_compilation (decl, asmspec,
3331 current_binding_level == global_binding_level,
3334 if (current_binding_level != global_binding_level)
3336 /* Recompute the RTL of a local array now
3337 if it used to be an incomplete type. */
3339 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3341 /* If we used it already as memory, it must stay in memory. */
3342 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3343 /* If it's still incomplete now, no init will save it. */
3344 if (DECL_SIZE (decl) == 0)
3345 DECL_INITIAL (decl) = 0;
3348 /* Compute and store the initial value. */
3349 if (TREE_CODE (decl) != FUNCTION_DECL)
3350 expand_decl_init (decl);
3354 if (TREE_CODE (decl) == TYPE_DECL)
3356 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3357 maybe_objc_check_decl (decl);
3358 rest_of_decl_compilation (decl, NULL_PTR,
3359 current_binding_level == global_binding_level,
3363 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3364 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3365 && temporary && TREE_PERMANENT (decl))
3367 /* We need to remember that this array HAD an initialization,
3368 but discard the actual temporary nodes,
3369 since we can't have a permanent node keep pointing to them. */
3370 /* We make an exception for inline functions, since it's
3371 normal for a local extern redeclaration of an inline function
3372 to have a copy of the top-level decl's DECL_INLINE. */
3373 if (DECL_INITIAL (decl) != 0)
3374 DECL_INITIAL (decl) = error_mark_node;
3378 /* Resume permanent allocation, if not within a function. */
3379 /* The corresponding push_obstacks_nochange is in start_decl,
3380 and in push_parm_decl and in grokfield. */
3384 /* If we have gone back from temporary to permanent allocation,
3385 actually free the temporary space that we no longer need. */
3386 if (temporary && !allocation_temporary_p ())
3387 permanent_allocation ();
3389 /* At the end of a declaration, throw away any variable type sizes
3390 of types defined inside that declaration. There is no use
3391 computing them in the following function definition. */
3392 if (current_binding_level == global_binding_level)
3393 get_pending_sizes ();
3396 /* If DECL has a cleanup, build and return that cleanup here.
3397 This is a callback called by expand_expr. */
3400 maybe_build_cleanup (decl)
3403 /* There are no cleanups in C. */
3407 /* Given a parsed parameter declaration,
3408 decode it into a PARM_DECL and push that on the current binding level.
3409 Also, for the sake of forward parm decls,
3410 record the given order of parms in `parm_order'. */
3413 push_parm_decl (parm)
3417 int old_immediate_size_expand = immediate_size_expand;
3418 /* Don't try computing parm sizes now -- wait till fn is called. */
3419 immediate_size_expand = 0;
3421 /* The corresponding pop_obstacks is in finish_decl. */
3422 push_obstacks_nochange ();
3424 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3425 if (DECL_NAME (decl))
3427 olddecl = lookup_name (DECL_NAME (decl));
3428 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3429 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3431 decl = pushdecl (decl);
3433 immediate_size_expand = old_immediate_size_expand;
3435 current_binding_level->parm_order
3436 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3438 /* Add this decl to the current binding level. */
3439 finish_decl (decl, NULL_TREE, NULL_TREE);
3442 /* Clear the given order of parms in `parm_order'.
3443 Used at start of parm list,
3444 and also at semicolon terminating forward decls. */
3449 current_binding_level->parm_order = NULL_TREE;
3452 /* Make TYPE a complete type based on INITIAL_VALUE.
3453 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3454 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3457 complete_array_type (type, initial_value, do_default)
3462 register tree maxindex = NULL_TREE;
3467 /* Note MAXINDEX is really the maximum index,
3468 one less than the size. */
3469 if (TREE_CODE (initial_value) == STRING_CST)
3472 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3473 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3475 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3478 = list_length (CONSTRUCTOR_ELTS (initial_value));
3479 maxindex = build_int_2 (nelts - 1, 0);
3483 /* Make an error message unless that happened already. */
3484 if (initial_value != error_mark_node)
3487 /* Prevent further error messages. */
3488 maxindex = build_int_2 (1, 0);
3495 maxindex = build_int_2 (1, 0);
3501 TYPE_DOMAIN (type) = build_index_type (maxindex);
3502 if (!TREE_TYPE (maxindex))
3503 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3506 /* Lay out the type now that we can get the real answer. */
3513 /* Given declspecs and a declarator,
3514 determine the name and type of the object declared
3515 and construct a ..._DECL node for it.
3516 (In one case we can return a ..._TYPE node instead.
3517 For invalid input we sometimes return 0.)
3519 DECLSPECS is a chain of tree_list nodes whose value fields
3520 are the storage classes and type specifiers.
3522 DECL_CONTEXT says which syntactic context this declaration is in:
3523 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3524 FUNCDEF for a function definition. Like NORMAL but a few different
3525 error messages in each case. Return value may be zero meaning
3526 this definition is too screwy to try to parse.
3527 PARM for a parameter declaration (either within a function prototype
3528 or before a function body). Make a PARM_DECL, or return void_type_node.
3529 TYPENAME if for a typename (in a cast or sizeof).
3530 Don't make a DECL node; just return the ..._TYPE node.
3531 FIELD for a struct or union field; make a FIELD_DECL.
3532 BITFIELD for a field with specified width.
3533 INITIALIZED is 1 if the decl has an initializer.
3535 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3536 It may also be so in the PARM case, for a prototype where the
3537 argument type is specified but not the name.
3539 This function is where the complicated C meanings of `static'
3540 and `extern' are interpreted. */
3543 grokdeclarator (declarator, declspecs, decl_context, initialized)
3546 enum decl_context decl_context;
3551 tree type = NULL_TREE;
3556 int explicit_int = 0;
3557 int explicit_char = 0;
3558 tree typedef_decl = 0;
3560 tree typedef_type = 0;
3561 int funcdef_flag = 0;
3562 enum tree_code innermost_code = ERROR_MARK;
3564 int size_varies = 0;
3566 if (decl_context == BITFIELD)
3567 bitfield = 1, decl_context = FIELD;
3569 if (decl_context == FUNCDEF)
3570 funcdef_flag = 1, decl_context = NORMAL;
3572 push_obstacks_nochange ();
3574 if (flag_traditional && allocation_temporary_p ())
3575 end_temporary_allocation ();
3577 /* Look inside a declarator for the name being declared
3578 and get it as a string, for an error message. */
3580 register tree decl = declarator;
3584 switch (TREE_CODE (decl))
3589 innermost_code = TREE_CODE (decl);
3590 decl = TREE_OPERAND (decl, 0);
3593 case IDENTIFIER_NODE:
3594 name = IDENTIFIER_POINTER (decl);
3605 /* A function definition's declarator must have the form of
3606 a function declarator. */
3608 if (funcdef_flag && innermost_code != CALL_EXPR)
3611 /* Anything declared one level down from the top level
3612 must be one of the parameters of a function
3613 (because the body is at least two levels down). */
3615 /* If this looks like a function definition, make it one,
3616 even if it occurs where parms are expected.
3617 Then store_parm_decls will reject it and not use it as a parm. */
3618 if (decl_context == NORMAL && !funcdef_flag
3619 && current_binding_level->level_chain == global_binding_level)
3620 decl_context = PARM;
3622 /* Look through the decl specs and record which ones appear.
3623 Some typespecs are defined as built-in typenames.
3624 Others, the ones that are modifiers of other types,
3625 are represented by bits in SPECBITS: set the bits for
3626 the modifiers that appear. Storage class keywords are also in SPECBITS.
3628 If there is a typedef name or a type, store the type in TYPE.
3629 This includes builtin typedefs such as `int'.
3631 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3632 and did not come from a user typedef.
3634 Set LONGLONG if `long' is mentioned twice. */
3636 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3639 register tree id = TREE_VALUE (spec);
3641 if (id == ridpointers[(int) RID_INT])
3643 if (id == ridpointers[(int) RID_CHAR])
3646 if (TREE_CODE (id) == IDENTIFIER_NODE)
3647 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3649 if (ridpointers[i] == id)
3651 if (i == (int) RID_LONG && specbits & (1<<i))
3654 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3656 error ("`long long long' is too long for GCC");
3660 else if (specbits & (1 << i))
3661 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3667 error ("two or more data types in declaration of `%s'", name);
3668 /* Actual typedefs come to us as TYPE_DECL nodes. */
3669 else if (TREE_CODE (id) == TYPE_DECL)
3671 type = TREE_TYPE (id);
3674 /* Built-in types come as identifiers. */
3675 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3677 register tree t = lookup_name (id);
3678 if (TREE_TYPE (t) == error_mark_node)
3680 else if (!t || TREE_CODE (t) != TYPE_DECL)
3681 error ("`%s' fails to be a typedef or built in type",
3682 IDENTIFIER_POINTER (id));
3685 type = TREE_TYPE (t);
3689 else if (TREE_CODE (id) != ERROR_MARK)
3695 typedef_type = type;
3697 size_varies = C_TYPE_VARIABLE_SIZE (type);
3699 /* No type at all: default to `int', and set EXPLICIT_INT
3700 because it was not a user-defined typedef. */
3704 if (funcdef_flag && warn_return_type
3705 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3706 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3707 warn_about_return_type = 1;
3709 type = integer_type_node;
3712 /* Now process the modifiers that were specified
3713 and check for invalid combinations. */
3715 /* Long double is a special combination. */
3717 if ((specbits & 1 << (int) RID_LONG)
3718 && TYPE_MAIN_VARIANT (type) == double_type_node)
3720 specbits &= ~ (1 << (int) RID_LONG);
3721 type = long_double_type_node;
3724 /* Check all other uses of type modifiers. */
3726 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3727 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3731 if (TREE_CODE (type) != INTEGER_TYPE)
3732 error ("long, short, signed or unsigned invalid for `%s'", name);
3733 else if ((specbits & 1 << (int) RID_LONG)
3734 && (specbits & 1 << (int) RID_SHORT))
3735 error ("long and short specified together for `%s'", name);
3736 else if (((specbits & 1 << (int) RID_LONG)
3737 || (specbits & 1 << (int) RID_SHORT))
3739 error ("long or short specified with char for `%s'", name);
3740 else if (((specbits & 1 << (int) RID_LONG)
3741 || (specbits & 1 << (int) RID_SHORT))
3742 && TREE_CODE (type) == REAL_TYPE)
3743 error ("long or short specified with floating type for `%s'", name);
3744 else if ((specbits & 1 << (int) RID_SIGNED)
3745 && (specbits & 1 << (int) RID_UNSIGNED))
3746 error ("signed and unsigned given together for `%s'", name);
3750 if (!explicit_int && !explicit_char && pedantic)
3752 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3754 if (flag_pedantic_errors)
3759 /* Discard the type modifiers if they are invalid. */
3762 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3763 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3768 /* Decide whether an integer type is signed or not.
3769 Optionally treat bitfields as signed by default. */
3770 if (specbits & 1 << (int) RID_UNSIGNED
3771 /* Traditionally, all bitfields are unsigned. */
3772 || (bitfield && flag_traditional
3773 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3774 || (bitfield && ! flag_signed_bitfields
3775 && (explicit_int || explicit_char
3776 /* A typedef for plain `int' without `signed'
3777 can be controlled just like plain `int'. */
3778 || ! (typedef_decl != 0
3779 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3780 && TREE_CODE (type) != ENUMERAL_TYPE
3781 && !(specbits & 1 << (int) RID_SIGNED)))
3784 type = long_long_unsigned_type_node;
3785 else if (specbits & 1 << (int) RID_LONG)
3786 type = long_unsigned_type_node;
3787 else if (specbits & 1 << (int) RID_SHORT)
3788 type = short_unsigned_type_node;
3789 else if (type == char_type_node)
3790 type = unsigned_char_type_node;
3791 else if (typedef_decl)
3792 type = unsigned_type (type);
3794 type = unsigned_type_node;
3796 else if ((specbits & 1 << (int) RID_SIGNED)
3797 && type == char_type_node)
3798 type = signed_char_type_node;
3800 type = long_long_integer_type_node;
3801 else if (specbits & 1 << (int) RID_LONG)
3802 type = long_integer_type_node;
3803 else if (specbits & 1 << (int) RID_SHORT)
3804 type = short_integer_type_node;
3806 /* Set CONSTP if this declaration is `const', whether by
3807 explicit specification or via a typedef.
3808 Likewise for VOLATILEP. */
3810 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3811 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3812 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3814 pedwarn ("duplicate `const'");
3816 pedwarn ("duplicate `volatile'");
3817 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
3818 type = TYPE_MAIN_VARIANT (type);
3820 /* Warn if two storage classes are given. Default to `auto'. */
3825 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3826 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3827 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3828 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3829 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3831 /* Warn about storage classes that are invalid for certain
3832 kinds of declarations (parameters, typenames, etc.). */
3835 error ("multiple storage classes in declaration of `%s'", name);
3836 else if (funcdef_flag
3838 & ((1 << (int) RID_REGISTER)
3839 | (1 << (int) RID_AUTO)
3840 | (1 << (int) RID_TYPEDEF))))
3842 if (specbits & 1 << (int) RID_AUTO
3843 && (pedantic || current_binding_level == global_binding_level))
3844 pedwarn ("function definition declared `auto'");
3845 if (specbits & 1 << (int) RID_REGISTER)
3846 error ("function definition declared `register'");
3847 if (specbits & 1 << (int) RID_TYPEDEF)
3848 error ("function definition declared `typedef'");
3849 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3850 | (1 << (int) RID_AUTO));
3852 else if (decl_context != NORMAL && nclasses > 0)
3854 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3858 error ((decl_context == FIELD
3859 ? "storage class specified for structure field `%s'"
3860 : (decl_context == PARM
3861 ? "storage class specified for parameter `%s'"
3862 : "storage class specified for typename")),
3864 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3865 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3866 | (1 << (int) RID_EXTERN));
3869 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3871 /* `extern' with initialization is invalid if not at top level. */
3872 if (current_binding_level == global_binding_level)
3873 warning ("`%s' initialized and declared `extern'", name);
3875 error ("`%s' has both `extern' and initializer", name);
3877 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
3878 && current_binding_level != global_binding_level)
3879 error ("nested function `%s' declared `extern'", name);
3880 else if (current_binding_level == global_binding_level
3881 && specbits & (1 << (int) RID_AUTO))
3882 error ("top-level declaration of `%s' specifies `auto'", name);
3885 /* Now figure out the structure of the declarator proper.
3886 Descend through it, creating more complex types, until we reach
3887 the declared identifier (or NULL_TREE, in an absolute declarator). */
3889 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3891 if (type == error_mark_node)
3893 declarator = TREE_OPERAND (declarator, 0);
3897 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3898 an INDIRECT_REF (for *...),
3899 a CALL_EXPR (for ...(...)),
3900 an identifier (for the name being declared)
3901 or a null pointer (for the place in an absolute declarator
3902 where the name was omitted).
3903 For the last two cases, we have just exited the loop.
3905 At this point, TYPE is the type of elements of an array,
3906 or for a function to return, or for a pointer to point to.
3907 After this sequence of ifs, TYPE is the type of the
3908 array or function or pointer, and DECLARATOR has had its
3909 outermost layer removed. */
3911 if (TREE_CODE (declarator) == ARRAY_REF)
3913 register tree itype = NULL_TREE;
3914 register tree size = TREE_OPERAND (declarator, 1);
3916 declarator = TREE_OPERAND (declarator, 0);
3918 /* Check for some types that there cannot be arrays of. */
3920 if (TYPE_MAIN_VARIANT (type) == void_type_node)
3922 error ("declaration of `%s' as array of voids", name);
3923 type = error_mark_node;
3926 if (TREE_CODE (type) == FUNCTION_TYPE)
3928 error ("declaration of `%s' as array of functions", name);
3929 type = error_mark_node;
3932 if (size == error_mark_node)
3933 type = error_mark_node;
3935 if (type == error_mark_node)
3938 /* If size was specified, set ITYPE to a range-type for that size.
3939 Otherwise, ITYPE remains null. finish_decl may figure it out
3940 from an initial value. */
3944 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3945 STRIP_TYPE_NOPS (size);
3947 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
3948 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
3950 error ("size of array `%s' has non-integer type", name);
3951 size = integer_one_node;
3953 if (pedantic && integer_zerop (size))
3954 pedwarn ("ANSI C forbids zero-size array `%s'", name);
3955 if (TREE_CODE (size) == INTEGER_CST)
3957 if (INT_CST_LT (size, integer_zero_node))
3959 error ("size of array `%s' is negative", name);
3960 size = integer_one_node;
3962 itype = build_index_type (size_binop (MINUS_EXPR, size,
3968 pedwarn ("ANSI C forbids variable-size array `%s'", name);
3969 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
3971 /* Make sure the array size remains visibly nonconstant
3972 even if it is (eg) a const variable with known value. */
3974 itype = variable_size (itype);
3975 itype = build_index_type (itype);
3979 #if 0 /* This had bad results for pointers to arrays, as in
3980 union incomplete (*foo)[4]; */
3981 /* Complain about arrays of incomplete types, except in typedefs. */
3983 if (TYPE_SIZE (type) == 0
3984 /* Avoid multiple warnings for nested array types. */
3985 && TREE_CODE (type) != ARRAY_TYPE
3986 && !(specbits & (1 << (int) RID_TYPEDEF))
3987 && !C_TYPE_BEING_DEFINED (type))
3988 warning ("array type has incomplete element type");
3991 /* Build the array type itself.
3992 Merge any constancy or volatility into the target type. */
3994 #if 0 /* We shouldn't have a function type here at all!
3995 Functions aren't allowed as array elements. */
3996 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3997 && (constp || volatilep))
3998 pedwarn ("ANSI C forbids const or volatile function types");
4000 if (constp || volatilep)
4001 type = c_build_type_variant (type, constp, volatilep);
4003 #if 0 /* don't clear these; leave them set so that the array type
4004 or the variable is itself const or volatile. */
4009 type = build_array_type (type, itype);
4011 C_TYPE_VARIABLE_SIZE (type) = 1;
4013 else if (TREE_CODE (declarator) == CALL_EXPR)
4015 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4016 || current_binding_level == global_binding_level);
4019 /* Declaring a function type.
4020 Make sure we have a valid type for the function to return. */
4021 if (type == error_mark_node)
4026 /* Warn about some types functions can't return. */
4028 if (TREE_CODE (type) == FUNCTION_TYPE)
4030 error ("`%s' declared as function returning a function", name);
4031 type = integer_type_node;
4033 if (TREE_CODE (type) == ARRAY_TYPE)
4035 error ("`%s' declared as function returning an array", name);
4036 type = integer_type_node;
4039 #ifndef TRADITIONAL_RETURN_FLOAT
4040 /* Traditionally, declaring return type float means double. */
4042 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4043 type = double_type_node;
4044 #endif /* TRADITIONAL_RETURN_FLOAT */
4046 /* If this is a block level extern, it must live past the end
4047 of the function so that we can check it against other extern
4048 declarations (IDENTIFIER_LIMBO_VALUE). */
4049 if (extern_ref && allocation_temporary_p ())
4050 end_temporary_allocation ();
4052 /* Construct the function type and go to the next
4053 inner layer of declarator. */
4055 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4057 /* Say it's a definition
4058 only for the CALL_EXPR
4059 closest to the identifier. */
4060 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4061 #if 0 /* This seems to be false. We turn off temporary allocation
4062 above in this function if -traditional.
4063 And this code caused inconsistent results with prototypes:
4064 callers would ignore them, and pass arguments wrong. */
4066 /* Omit the arg types if -traditional, since the arg types
4067 and the list links might not be permanent. */
4068 type = build_function_type (type,
4070 ? NULL_TREE : arg_types);
4072 type = build_function_type (type, arg_types);
4073 declarator = TREE_OPERAND (declarator, 0);
4075 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4076 the formal parameter list of this FUNCTION_TYPE to point to
4077 the FUNCTION_TYPE node itself. */
4082 for (link = current_function_parm_tags;
4084 link = TREE_CHAIN (link))
4085 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4088 else if (TREE_CODE (declarator) == INDIRECT_REF)
4090 /* Merge any constancy or volatility into the target type
4093 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4094 && (constp || volatilep))
4095 pedwarn ("ANSI C forbids const or volatile function types");
4096 if (constp || volatilep)
4097 type = c_build_type_variant (type, constp, volatilep);
4102 type = build_pointer_type (type);
4104 /* Process a list of type modifier keywords
4105 (such as const or volatile) that were given inside the `*'. */
4107 if (TREE_TYPE (declarator))
4109 register tree typemodlist;
4111 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4112 typemodlist = TREE_CHAIN (typemodlist))
4114 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4116 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4121 error ("invalid type modifier within pointer declarator");
4125 pedwarn ("duplicate `const'");
4127 pedwarn ("duplicate `volatile'");
4130 declarator = TREE_OPERAND (declarator, 0);
4137 /* Now TYPE has the actual type. */
4139 /* If this is declaring a typedef name, return a TYPE_DECL. */
4141 if (specbits & (1 << (int) RID_TYPEDEF))
4144 /* Note that the grammar rejects storage classes
4145 in typenames, fields or parameters */
4146 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4147 && (constp || volatilep))
4148 pedwarn ("ANSI C forbids const or volatile function types");
4149 if (constp || volatilep)
4150 type = c_build_type_variant (type, constp, volatilep);
4152 decl = build_decl (TYPE_DECL, declarator, type);
4153 if ((specbits & (1 << (int) RID_SIGNED))
4154 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4155 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4159 /* Detect the case of an array type of unspecified size
4160 which came, as such, direct from a typedef name.
4161 We must copy the type, so that each identifier gets
4162 a distinct type, so that each identifier's size can be
4163 controlled separately by its own initializer. */
4165 if (type != 0 && typedef_type != 0
4166 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4167 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4169 type = build_array_type (TREE_TYPE (type), 0);
4171 C_TYPE_VARIABLE_SIZE (type) = 1;
4174 /* If this is a type name (such as, in a cast or sizeof),
4175 compute the type and return it now. */
4177 if (decl_context == TYPENAME)
4179 /* Note that the grammar rejects storage classes
4180 in typenames, fields or parameters */
4181 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4182 && (constp || volatilep))
4183 pedwarn ("ANSI C forbids const or volatile function types");
4184 if (constp || volatilep)
4185 type = c_build_type_variant (type, constp, volatilep);
4190 /* `void' at top level (not within pointer)
4191 is allowed only in typedefs or type names.
4192 We don't complain about parms either, but that is because
4193 a better error message can be made later. */
4195 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM)
4197 error ("variable or field `%s' declared void",
4198 IDENTIFIER_POINTER (declarator));
4199 type = integer_type_node;
4202 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4203 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4208 if (decl_context == PARM)
4210 tree type_as_written = type;
4213 /* A parameter declared as an array of T is really a pointer to T.
4214 One declared as a function is really a pointer to a function. */
4216 if (TREE_CODE (type) == ARRAY_TYPE)
4218 /* Transfer const-ness of array into that of type pointed to. */
4219 type = build_pointer_type
4220 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4221 volatilep = constp = 0;
4224 else if (TREE_CODE (type) == FUNCTION_TYPE)
4226 if (pedantic && (constp || volatilep))
4227 pedwarn ("ANSI C forbids const or volatile function types");
4228 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4229 volatilep = constp = 0;
4232 decl = build_decl (PARM_DECL, declarator, type);
4234 C_DECL_VARIABLE_SIZE (decl) = 1;
4236 /* Compute the type actually passed in the parmlist,
4237 for the case where there is no prototype.
4238 (For example, shorts and chars are passed as ints.)
4239 When there is a prototype, this is overridden later. */
4241 DECL_ARG_TYPE (decl) = type;
4242 main_type = TYPE_MAIN_VARIANT (type);
4243 if (main_type == float_type_node)
4244 DECL_ARG_TYPE (decl) = double_type_node;
4245 /* Don't use TYPE_PRECISION to decide whether to promote,
4246 because we should convert short if it's the same size as int,
4247 but we should not convert long if it's the same size as int. */
4248 else if (C_PROMOTING_INTEGER_TYPE_P (main_type))
4250 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4251 && TREE_UNSIGNED (type))
4252 DECL_ARG_TYPE (decl) = unsigned_type_node;
4254 DECL_ARG_TYPE (decl) = integer_type_node;
4257 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4259 else if (decl_context == FIELD)
4261 /* Structure field. It may not be a function. */
4263 if (TREE_CODE (type) == FUNCTION_TYPE)
4265 error ("field `%s' declared as a function",
4266 IDENTIFIER_POINTER (declarator));
4267 type = build_pointer_type (type);
4269 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4271 error ("field `%s' has incomplete type",
4272 IDENTIFIER_POINTER (declarator));
4273 type = error_mark_node;
4275 /* Move type qualifiers down to element of an array. */
4276 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4278 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4280 TYPE_DOMAIN (type));
4281 #if 0 /* Leave the field const or volatile as well. */
4282 constp = volatilep = 0;
4285 decl = build_decl (FIELD_DECL, declarator, type);
4287 C_DECL_VARIABLE_SIZE (decl) = 1;
4289 else if (TREE_CODE (type) == FUNCTION_TYPE)
4291 /* Every function declaration is "external"
4292 except for those which are inside a function body
4293 in which `auto' is used.
4294 That is a case not specified by ANSI C,
4295 and we use it for forward declarations for nested functions. */
4296 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4297 || current_binding_level == global_binding_level);
4299 if (specbits & (1 << (int) RID_AUTO)
4300 && (pedantic || current_binding_level == global_binding_level))
4301 pedwarn ("invalid storage class for function `%s'",
4302 IDENTIFIER_POINTER (declarator));
4303 if (specbits & (1 << (int) RID_REGISTER))
4304 error ("invalid storage class for function `%s'",
4305 IDENTIFIER_POINTER (declarator));
4306 /* Function declaration not at top level.
4307 Storage classes other than `extern' are not allowed
4308 and `extern' makes no difference. */
4309 if (current_binding_level != global_binding_level
4310 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4312 pedwarn ("invalid storage class for function `%s'",
4313 IDENTIFIER_POINTER (declarator));
4315 /* If this is a block level extern, it must live past the end
4316 of the function so that we can check it against other
4317 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4318 if (extern_ref && allocation_temporary_p ())
4319 end_temporary_allocation ();
4321 decl = build_decl (FUNCTION_DECL, declarator, type);
4323 if (pedantic && (constp || volatilep)
4324 && ! DECL_IN_SYSTEM_HEADER (decl))
4325 pedwarn ("ANSI C forbids const or volatile functions");
4328 DECL_EXTERNAL (decl) = 1;
4329 /* Record absence of global scope for `static' or `auto'. */
4331 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4332 /* Record presence of `inline', if it is reasonable. */
4335 tree last = tree_last (TYPE_ARG_TYPES (type));
4337 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4338 warning ("cannot inline function `main'");
4339 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4341 warning ("inline declaration ignored for function with `...'");
4343 /* Assume that otherwise the function can be inlined. */
4344 DECL_INLINE (decl) = 1;
4346 if (specbits & (1 << (int) RID_EXTERN))
4347 current_extern_inline = 1;
4352 /* It's a variable. */
4353 /* An uninitialized decl with `extern' is a reference. */
4354 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4356 /* Move type qualifiers down to element of an array. */
4357 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4359 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4361 TYPE_DOMAIN (type));
4362 #if 0 /* Leave the variable const or volatile as well. */
4363 constp = volatilep = 0;
4367 /* If this is a block level extern, it must live past the end
4368 of the function so that we can check it against other
4369 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4370 if (extern_ref && allocation_temporary_p ())
4371 end_temporary_allocation ();
4373 decl = build_decl (VAR_DECL, declarator, type);
4375 C_DECL_VARIABLE_SIZE (decl) = 1;
4378 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4380 DECL_EXTERNAL (decl) = extern_ref;
4381 /* At top level, the presence of a `static' or `register' storage
4382 class specifier, or the absence of all storage class specifiers
4383 makes this declaration a definition (perhaps tentative). Also,
4384 the absence of both `static' and `register' makes it public. */
4385 if (current_binding_level == global_binding_level)
4389 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4390 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4392 /* Not at top level, only `static' makes a static definition. */
4395 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4396 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4400 /* Record `register' declaration for warnings on &
4401 and in case doing stupid register allocation. */
4403 if (specbits & (1 << (int) RID_REGISTER))
4404 DECL_REGISTER (decl) = 1;
4406 /* Record constancy and volatility. */
4409 TREE_READONLY (decl) = 1;
4412 TREE_SIDE_EFFECTS (decl) = 1;
4413 TREE_THIS_VOLATILE (decl) = 1;
4415 /* If a type has volatile components, it should be stored in memory.
4416 Otherwise, the fact that those components are volatile
4417 will be ignored, and would even crash the compiler. */
4418 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4419 mark_addressable (decl);
4427 /* Make a variant type in the proper way for C, propagating qualifiers
4428 down to the element type of an array. */
4431 c_build_type_variant (type, constp, volatilep)
4433 int constp, volatilep;
4435 if (TREE_CODE (type) == ARRAY_TYPE)
4436 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4438 TYPE_DOMAIN (type));
4439 return build_type_variant (type, constp, volatilep);
4442 /* Decode the parameter-list info for a function type or function definition.
4443 The argument is the value returned by `get_parm_info' (or made in parse.y
4444 if there is an identifier list instead of a parameter decl list).
4445 These two functions are separate because when a function returns
4446 or receives functions then each is called multiple times but the order
4447 of calls is different. The last call to `grokparms' is always the one
4448 that contains the formal parameter names of a function definition.
4450 Store in `last_function_parms' a chain of the decls of parms.
4451 Also store in `last_function_parm_tags' a chain of the struct, union,
4452 and enum tags declared among the parms.
4454 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4456 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4457 a mere declaration. A nonempty identifier-list gets an error message
4458 when FUNCDEF_FLAG is zero. */
4461 grokparms (parms_info, funcdef_flag)
4465 tree first_parm = TREE_CHAIN (parms_info);
4467 last_function_parms = TREE_PURPOSE (parms_info);
4468 last_function_parm_tags = TREE_VALUE (parms_info);
4470 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4471 && !in_system_header)
4472 warning ("function declaration isn't a prototype");
4475 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4478 pedwarn ("parameter names (without types) in function declaration");
4480 last_function_parms = first_parm;
4487 /* We no longer test FUNCDEF_FLAG.
4488 If the arg types are incomplete in a declaration,
4489 they must include undefined tags.
4490 These tags can never be defined in the scope of the declaration,
4491 so the types can never be completed,
4492 and no call can be compiled successfully. */
4494 /* In a fcn definition, arg types must be complete. */
4497 for (parm = last_function_parms, typelt = first_parm;
4499 parm = TREE_CHAIN (parm))
4500 /* Skip over any enumeration constants declared here. */
4501 if (TREE_CODE (parm) == PARM_DECL)
4503 /* Barf if the parameter itself has an incomplete type. */
4504 tree type = TREE_VALUE (typelt);
4505 if (TYPE_SIZE (type) == 0)
4507 if (funcdef_flag && DECL_NAME (parm) != 0)
4508 error ("parameter `%s' has incomplete type",
4509 IDENTIFIER_POINTER (DECL_NAME (parm)));
4511 warning ("parameter has incomplete type");
4514 TREE_VALUE (typelt) = error_mark_node;
4515 TREE_TYPE (parm) = error_mark_node;
4518 #if 0 /* This has been replaced by parm_tags_warning
4519 which uses a more accurate criterion for what to warn about. */
4522 /* Now warn if is a pointer to an incomplete type. */
4523 while (TREE_CODE (type) == POINTER_TYPE
4524 || TREE_CODE (type) == REFERENCE_TYPE)
4525 type = TREE_TYPE (type);
4526 type = TYPE_MAIN_VARIANT (type);
4527 if (TYPE_SIZE (type) == 0)
4529 if (DECL_NAME (parm) != 0)
4530 warning ("parameter `%s' points to incomplete type",
4531 IDENTIFIER_POINTER (DECL_NAME (parm)));
4533 warning ("parameter points to incomplete type");
4537 typelt = TREE_CHAIN (typelt);
4540 /* Allocate the list of types the way we allocate a type. */
4541 if (first_parm && ! TREE_PERMANENT (first_parm))
4543 /* Construct a copy of the list of types
4544 on the saveable obstack. */
4546 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4547 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4549 return nreverse (result);
4552 /* The list we have is permanent already. */
4558 /* Return a tree_list node with info on a parameter list just parsed.
4559 The TREE_PURPOSE is a chain of decls of those parms.
4560 The TREE_VALUE is a list of structure, union and enum tags defined.
4561 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4562 This tree_list node is later fed to `grokparms'.
4564 VOID_AT_END nonzero means append `void' to the end of the type-list.
4565 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4568 get_parm_info (void_at_end)
4571 register tree decl, t;
4572 register tree types = 0;
4574 tree tags = gettags ();
4575 tree parms = getdecls ();
4577 tree order = current_binding_level->parm_order;
4579 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4580 if (void_at_end && parms != 0
4581 && TREE_CHAIN (parms) == 0
4582 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4583 && DECL_NAME (parms) == 0)
4586 storedecls (NULL_TREE);
4587 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4588 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4591 /* Extract enumerator values and other non-parms declared with the parms.
4592 Likewise any forward parm decls that didn't have real parm decls. */
4593 for (decl = parms; decl; )
4595 tree next = TREE_CHAIN (decl);
4597 if (TREE_CODE (decl) != PARM_DECL)
4599 TREE_CHAIN (decl) = new_parms;
4602 else if (TREE_ASM_WRITTEN (decl))
4604 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4605 TREE_CHAIN (decl) = new_parms;
4611 /* Put the parm decls back in the order they were in in the parm list. */
4612 for (t = order; t; t = TREE_CHAIN (t))
4615 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4617 TREE_CHAIN (TREE_VALUE (t)) = 0;
4620 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4623 /* Store the parmlist in the binding level since the old one
4624 is no longer a valid list. (We have changed the chain pointers.) */
4625 storedecls (new_parms);
4627 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4628 /* There may also be declarations for enumerators if an enumeration
4629 type is declared among the parms. Ignore them here. */
4630 if (TREE_CODE (decl) == PARM_DECL)
4632 /* Since there is a prototype,
4633 args are passed in their declared types. */
4634 tree type = TREE_TYPE (decl);
4635 DECL_ARG_TYPE (decl) = type;
4636 #ifdef PROMOTE_PROTOTYPES
4637 if (TREE_CODE (type) == INTEGER_TYPE
4638 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4639 DECL_ARG_TYPE (decl) = integer_type_node;
4642 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4643 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4644 && DECL_NAME (decl) == 0)
4646 error ("`void' in parameter list must be the entire list");
4652 return saveable_tree_cons (new_parms, tags,
4653 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4655 return saveable_tree_cons (new_parms, tags, nreverse (types));
4658 /* At end of parameter list, warn about any struct, union or enum tags
4659 defined within. Do so because these types cannot ever become complete. */
4662 parmlist_tags_warning ()
4667 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4669 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4670 /* An anonymous union parm type is meaningful as a GNU extension.
4671 So don't warn for that. */
4672 if (code == UNION_TYPE && !pedantic)
4674 if (TREE_PURPOSE (elt) != 0)
4675 warning ("`%s %s' declared inside parameter list",
4676 (code == RECORD_TYPE ? "struct"
4677 : code == UNION_TYPE ? "union"
4679 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4681 warning ("anonymous %s declared inside parameter list",
4682 (code == RECORD_TYPE ? "struct"
4683 : code == UNION_TYPE ? "union"
4688 warning ("its scope is only this definition or declaration,");
4689 warning ("which is probably not what you want.");
4695 /* Get the struct, enum or union (CODE says which) with tag NAME.
4696 Define the tag as a forward-reference if it is not defined. */
4699 xref_tag (code, name)
4700 enum tree_code code;
4703 int temporary = allocation_temporary_p ();
4705 /* If a cross reference is requested, look up the type
4706 already defined for this tag and return it. */
4708 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4709 /* Even if this is the wrong type of tag, return what we found.
4710 There will be an error message anyway, from pending_xref_error.
4711 If we create an empty xref just for an invalid use of the type,
4712 the main result is to create lots of superfluous error messages. */
4716 push_obstacks_nochange ();
4718 if (current_binding_level == global_binding_level && temporary)
4719 end_temporary_allocation ();
4721 /* If no such tag is yet defined, create a forward-reference node
4722 and record it as the "definition".
4723 When a real declaration of this type is found,
4724 the forward-reference will be altered into a real type. */
4726 ref = make_node (code);
4727 if (code == ENUMERAL_TYPE)
4729 /* (In ANSI, Enums can be referred to only if already defined.) */
4731 pedwarn ("ANSI C forbids forward references to `enum' types");
4732 /* Give the type a default layout like unsigned int
4733 to avoid crashing if it does not get defined. */
4734 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4735 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4736 TREE_UNSIGNED (ref) = 1;
4737 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4738 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4739 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4742 pushtag (name, ref);
4749 /* Make sure that the tag NAME is defined *in the current binding level*
4750 at least as a forward reference.
4751 CODE says which kind of tag NAME ought to be.
4753 We also do a push_obstacks_nochange
4754 whose matching pop is in finish_struct. */
4757 start_struct (code, name)
4758 enum tree_code code;
4761 /* If there is already a tag defined at this binding level
4762 (as a forward reference), just return it. */
4764 register tree ref = 0;
4766 push_obstacks_nochange ();
4767 if (current_binding_level == global_binding_level)
4768 end_temporary_allocation ();
4771 ref = lookup_tag (code, name, current_binding_level, 1);
4772 if (ref && TREE_CODE (ref) == code)
4774 C_TYPE_BEING_DEFINED (ref) = 1;
4775 if (TYPE_FIELDS (ref))
4776 error ((code == UNION_TYPE ? "redefinition of `union %s'"
4777 : "redefinition of `struct %s'"),
4778 IDENTIFIER_POINTER (name));
4783 /* Otherwise create a forward-reference just so the tag is in scope. */
4785 ref = make_node (code);
4786 pushtag (name, ref);
4787 C_TYPE_BEING_DEFINED (ref) = 1;
4791 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4792 of a structure component, returning a FIELD_DECL node.
4793 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4795 This is done during the parsing of the struct declaration.
4796 The FIELD_DECL nodes are chained together and the lot of them
4797 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4800 grokfield (filename, line, declarator, declspecs, width)
4803 tree declarator, declspecs, width;
4807 /* The corresponding pop_obstacks is in finish_decl. */
4808 push_obstacks_nochange ();
4810 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4812 finish_decl (value, NULL_TREE, NULL_TREE);
4813 DECL_INITIAL (value) = width;
4818 /* Function to help qsort sort FIELD_DECLs by name order. */
4821 field_decl_cmp (x, y)
4824 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
4827 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4828 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4830 We also do a pop_obstacks to match the push in start_struct. */
4833 finish_struct (t, fieldlist)
4834 register tree t, fieldlist;
4838 int toplevel = global_binding_level == current_binding_level;
4840 /* If this type was previously laid out as a forward reference,
4841 make sure we lay it out again. */
4845 /* Nameless union parm types are useful as GCC extension. */
4846 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4847 /* Otherwise, warn about any struct or union def. in parmlist. */
4848 if (in_parm_level_p ())
4851 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4852 : "structure defined inside parms"));
4853 else if (! flag_traditional)
4854 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4855 : "structure defined inside parms"));
4858 old_momentary = suspend_momentary ();
4860 if (fieldlist == 0 && pedantic)
4861 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
4862 : "structure has no members"));
4864 /* Install struct as DECL_CONTEXT of each field decl.
4865 Also process specified field sizes.
4866 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
4867 The specified size is found in the DECL_INITIAL.
4868 Store 0 there, except for ": 0" fields (so we can find them
4869 and delete them, below). */
4871 for (x = fieldlist; x; x = TREE_CHAIN (x))
4873 DECL_CONTEXT (x) = t;
4874 DECL_FIELD_SIZE (x) = 0;
4876 /* If any field is const, the structure type is pseudo-const. */
4877 if (TREE_READONLY (x))
4878 C_TYPE_FIELDS_READONLY (t) = 1;
4881 /* A field that is pseudo-const makes the structure likewise. */
4882 tree t1 = TREE_TYPE (x);
4883 while (TREE_CODE (t1) == ARRAY_TYPE)
4884 t1 = TREE_TYPE (t1);
4885 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4886 && C_TYPE_FIELDS_READONLY (t1))
4887 C_TYPE_FIELDS_READONLY (t) = 1;
4890 /* Any field that is volatile means variables of this type must be
4891 treated in some ways as volatile. */
4892 if (TREE_THIS_VOLATILE (x))
4893 C_TYPE_FIELDS_VOLATILE (t) = 1;
4895 /* Any field of nominal variable size implies structure is too. */
4896 if (C_DECL_VARIABLE_SIZE (x))
4897 C_TYPE_VARIABLE_SIZE (t) = 1;
4899 /* Detect invalid nested redefinition. */
4900 if (TREE_TYPE (x) == t)
4901 error ("nested redefinition of `%s'",
4902 IDENTIFIER_POINTER (TYPE_NAME (t)));
4904 /* Detect invalid bit-field size. */
4905 if (DECL_INITIAL (x))
4906 STRIP_NOPS (DECL_INITIAL (x));
4907 if (DECL_INITIAL (x) && TREE_CODE (DECL_INITIAL (x)) != INTEGER_CST)
4909 error_with_decl (x, "bit-field `%s' width not an integer constant");
4910 DECL_INITIAL (x) = NULL;
4913 /* Detect invalid bit-field type. */
4914 if (DECL_INITIAL (x)
4915 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4916 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4918 error_with_decl (x, "bit-field `%s' has invalid type");
4919 DECL_INITIAL (x) = NULL;
4921 if (DECL_INITIAL (x) && pedantic
4922 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4923 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node)
4924 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
4926 /* Detect and ignore out of range field width. */
4927 if (DECL_INITIAL (x))
4929 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4931 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
4933 DECL_INITIAL (x) = NULL;
4934 error_with_decl (x, "negative width in bit-field `%s'");
4936 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
4937 || width > TYPE_PRECISION (TREE_TYPE (x)))
4939 DECL_INITIAL (x) = NULL;
4940 pedwarn_with_decl (x, "width of `%s' exceeds its type");
4942 else if (width == 0 && DECL_NAME (x) != 0)
4944 error_with_decl (x, "zero width for bit-field `%s'");
4945 DECL_INITIAL (x) = NULL;
4949 /* Process valid field width. */
4950 if (DECL_INITIAL (x))
4952 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4954 DECL_FIELD_SIZE (x) = width;
4955 DECL_BIT_FIELD (x) = 1;
4956 DECL_INITIAL (x) = NULL;
4960 /* field size 0 => force desired amount of alignment. */
4961 #ifdef EMPTY_FIELD_BOUNDARY
4962 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
4964 #ifdef PCC_BITFIELD_TYPE_MATTERS
4965 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
4966 TYPE_ALIGN (TREE_TYPE (x)));
4972 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
4973 : TYPE_ALIGN (TREE_TYPE (x)));
4974 /* Non-bit-fields are aligned for their type, except packed
4975 fields which require only BITS_PER_UNIT alignment. */
4976 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
4980 /* Now DECL_INITIAL is null on all members. */
4982 /* Delete all duplicate fields from the fieldlist */
4983 for (x = fieldlist; x && TREE_CHAIN (x);)
4984 /* Anonymous fields aren't duplicates. */
4985 if (DECL_NAME (TREE_CHAIN (x)) == 0)
4989 register tree y = fieldlist;
4993 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
4999 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5001 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5002 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5004 else x = TREE_CHAIN (x);
5007 /* Now we have the nearly final fieldlist. Record it,
5008 then lay out the structure or union (including the fields). */
5010 TYPE_FIELDS (t) = fieldlist;
5014 /* Delete all zero-width bit-fields from the front of the fieldlist */
5016 && DECL_INITIAL (fieldlist))
5017 fieldlist = TREE_CHAIN (fieldlist);
5018 /* Delete all such members from the rest of the fieldlist */
5019 for (x = fieldlist; x;)
5021 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5022 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5023 else x = TREE_CHAIN (x);
5026 /* Now we have the truly final field list.
5027 Store it in this type and in the variants. */
5029 TYPE_FIELDS (t) = fieldlist;
5031 /* If there are lots of fields, sort so we can look through them fast.
5032 We arbitrarily consider 16 or more elts to be "a lot". */
5036 for (x = fieldlist; x; x = TREE_CHAIN (x))
5047 len += list_length (x);
5048 /* Use the same allocation policy here that make_node uses, to
5049 ensure that this lives as long as the rest of the struct decl.
5050 All decls in an inline function need to be saved. */
5051 if (allocation_temporary_p ())
5052 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5054 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5056 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5057 TYPE_LANG_SPECIFIC (t)->len = len;
5059 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5061 for (x = fieldlist; x; x = TREE_CHAIN (x))
5062 field_array[len++] = x;
5064 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5068 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5070 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5071 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5072 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5075 /* Promote each bit-field's type to int if it is narrower than that. */
5076 for (x = fieldlist; x; x = TREE_CHAIN (x))
5077 if (DECL_BIT_FIELD (x)
5078 && C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)))
5080 tree type = TREE_TYPE (x);
5082 /* Preserve unsignedness if traditional or if not really any wider. */
5083 if (TREE_UNSIGNED (type)
5084 && (flag_traditional
5085 || (TYPE_PRECISION (type)
5086 == TYPE_PRECISION (integer_type_node))))
5087 TREE_TYPE (x) = unsigned_type_node;
5089 TREE_TYPE (x) = integer_type_node;
5092 /* If this structure or union completes the type of any previous
5093 variable declaration, lay it out and output its rtl. */
5095 if (current_binding_level->n_incomplete != 0)
5098 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5100 if (TREE_TYPE (decl) == t
5101 && TREE_CODE (decl) != TYPE_DECL)
5103 layout_decl (decl, 0);
5104 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5105 maybe_objc_check_decl (decl);
5106 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5109 --current_binding_level->n_incomplete;
5111 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5112 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5114 tree element = TREE_TYPE (decl);
5115 while (TREE_CODE (element) == ARRAY_TYPE)
5116 element = TREE_TYPE (element);
5118 layout_array_type (TREE_TYPE (decl));
5123 resume_momentary (old_momentary);
5125 /* Finish debugging output for this type. */
5126 rest_of_type_compilation (t, toplevel);
5128 /* The matching push is in start_struct. */
5134 /* Lay out the type T, and its element type, and so on. */
5137 layout_array_type (t)
5140 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5141 layout_array_type (TREE_TYPE (t));
5145 /* Begin compiling the definition of an enumeration type.
5146 NAME is its name (or null if anonymous).
5147 Returns the type object, as yet incomplete.
5148 Also records info about it so that build_enumerator
5149 may be used to declare the individual values as they are read. */
5155 register tree enumtype = 0;
5157 /* If this is the real definition for a previous forward reference,
5158 fill in the contents in the same object that used to be the
5159 forward reference. */
5162 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5164 /* The corresponding pop_obstacks is in finish_enum. */
5165 push_obstacks_nochange ();
5166 /* If these symbols and types are global, make them permanent. */
5167 if (current_binding_level == global_binding_level)
5168 end_temporary_allocation ();
5170 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5172 enumtype = make_node (ENUMERAL_TYPE);
5173 pushtag (name, enumtype);
5176 C_TYPE_BEING_DEFINED (enumtype) = 1;
5178 if (TYPE_VALUES (enumtype) != 0)
5180 /* This enum is a named one that has been declared already. */
5181 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5183 /* Completely replace its old definition.
5184 The old enumerators remain defined, however. */
5185 TYPE_VALUES (enumtype) = 0;
5188 enum_next_value = integer_zero_node;
5194 /* After processing and defining all the values of an enumeration type,
5195 install their decls in the enumeration type and finish it off.
5196 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5197 Returns ENUMTYPE. */
5200 finish_enum (enumtype, values)
5201 register tree enumtype, values;
5204 tree minnode = 0, maxnode = 0;
5205 register HOST_WIDE_INT maxvalue = 0;
5206 register HOST_WIDE_INT minvalue = 0;
5208 unsigned precision = 0;
5209 int toplevel = global_binding_level == current_binding_level;
5210 int temporary = allocation_temporary_p ();
5212 if (in_parm_level_p ())
5213 warning ("enum defined inside parms");
5215 /* Calculate the maximum value of any enumerator in this type. */
5217 for (pair = values; pair; pair = TREE_CHAIN (pair))
5219 tree value = TREE_VALUE (pair);
5221 minnode = maxnode = TREE_VALUE (pair);
5224 if (tree_int_cst_lt (maxnode, value))
5226 if (tree_int_cst_lt (value, minnode))
5231 TYPE_MIN_VALUE (enumtype) = minnode;
5232 TYPE_MAX_VALUE (enumtype) = maxnode;
5234 /* Determine the precision this type needs. */
5236 if (TREE_INT_CST_HIGH (minnode) >= 0
5237 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5238 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5239 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5240 precision = TYPE_PRECISION (long_long_integer_type_node);
5243 maxvalue = TREE_INT_CST_LOW (maxnode);
5244 minvalue = TREE_INT_CST_LOW (minnode);
5247 precision = floor_log2 (maxvalue) + 1;
5250 /* Compute number of bits to represent magnitude of a negative value.
5251 Add one to MINVALUE since range of negative numbers
5252 includes the power of two. */
5253 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5254 if (negprecision > precision)
5255 precision = negprecision;
5256 precision += 1; /* room for sign bit */
5263 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5264 /* Use the width of the narrowest normal C type which is wide enough. */
5265 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5267 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5269 TYPE_SIZE (enumtype) = 0;
5270 layout_type (enumtype);
5272 /* An enum can have some negative values; then it is signed. */
5273 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5275 /* If the enumerators might not fit in an int, change their type now. */
5276 /* It seems more useful in the debugger to leave these as int
5277 unless the enumerator is wider than int. */
5278 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5279 for (pair = values; pair; pair = TREE_CHAIN (pair))
5281 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5282 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5283 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5284 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5287 /* Replace the decl nodes in VALUES with their names. */
5288 for (pair = values; pair; pair = TREE_CHAIN (pair))
5289 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5291 TYPE_VALUES (enumtype) = values;
5293 /* Finish debugging output for this type. */
5294 rest_of_type_compilation (enumtype, toplevel);
5296 /* This matches a push in start_enum. */
5302 /* Build and install a CONST_DECL for one value of the
5303 current enumeration type (one that was begun with start_enum).
5304 Return a tree-list containing the CONST_DECL and its value.
5305 Assignment of sequential values by default is handled here. */
5308 build_enumerator (name, value)
5313 /* Validate and default VALUE. */
5315 /* Remove no-op casts from the value. */
5317 STRIP_TYPE_NOPS (value);
5319 if (value != 0 && TREE_CODE (value) != INTEGER_CST)
5321 error ("enumerator value for `%s' not integer constant",
5322 IDENTIFIER_POINTER (name));
5326 /* Default based on previous value. */
5327 /* It should no longer be possible to have NON_LVALUE_EXPR
5331 value = enum_next_value;
5333 error ("overflow in enumeration values");
5336 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5338 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5339 value = integer_zero_node;
5342 /* Set basis for default for next value. */
5343 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5344 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5346 /* Now create a declaration for the enum value name. */
5348 decl = build_decl (CONST_DECL, name, integer_type_node);
5349 DECL_INITIAL (decl) = value;
5350 TREE_TYPE (value) = integer_type_node;
5353 return saveable_tree_cons (decl, value, NULL_TREE);
5356 /* Create the FUNCTION_DECL for a function definition.
5357 DECLSPECS and DECLARATOR are the parts of the declaration;
5358 they describe the function's name and the type it returns,
5359 but twisted together in a fashion that parallels the syntax of C.
5361 This function creates a binding context for the function body
5362 as well as setting up the FUNCTION_DECL in current_function_decl.
5364 Returns 1 on success. If the DECLARATOR is not suitable for a function
5365 (it defines a datum instead), we return 0, which tells
5366 yyparse to report a parse error.
5368 NESTED is nonzero for a function nested within another function. */
5371 start_function (declspecs, declarator, nested)
5372 tree declarator, declspecs;
5375 tree decl1, old_decl;
5378 current_function_returns_value = 0; /* Assume, until we see it does. */
5379 current_function_returns_null = 0;
5380 warn_about_return_type = 0;
5381 current_extern_inline = 0;
5382 c_function_varargs = 0;
5384 shadowed_labels = 0;
5386 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5388 /* If the declarator is not suitable for a function definition,
5389 cause a syntax error. */
5393 announce_function (decl1);
5395 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5397 error ("return-type is an incomplete type");
5398 /* Make it return void instead. */
5400 = build_function_type (void_type_node,
5401 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5404 if (warn_about_return_type)
5405 warning ("return-type defaults to `int'");
5407 /* Save the parm names or decls from this function's declarator
5408 where store_parm_decls will find them. */
5409 current_function_parms = last_function_parms;
5410 current_function_parm_tags = last_function_parm_tags;
5412 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5413 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5414 DECL_INITIAL (decl1) = error_mark_node;
5416 /* If this definition isn't a prototype and we had a prototype declaration
5417 before, copy the arg type info from that prototype.
5418 But not if what we had before was a builtin function. */
5419 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5420 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5421 && !DECL_BUILT_IN (old_decl)
5422 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5423 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5424 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5425 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5427 /* Optionally warn of old-fashioned def with no previous prototype. */
5428 if (warn_strict_prototypes
5429 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5430 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5431 warning ("function declaration isn't a prototype");
5432 /* Optionally warn of any global def with no previous prototype. */
5433 else if (warn_missing_prototypes
5434 && TREE_PUBLIC (decl1)
5435 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5436 warning_with_decl (decl1, "no previous prototype for `%s'");
5437 /* Optionally warn of any def with no previous prototype
5438 if the function has already been used. */
5439 else if (warn_missing_prototypes
5440 && old_decl != 0 && TREE_USED (old_decl)
5441 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5442 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5444 /* This is a definition, not a reference.
5445 So normally clear DECL_EXTERNAL.
5446 However, `extern inline' acts like a declaration
5447 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5448 DECL_EXTERNAL (decl1) = current_extern_inline;
5450 /* This function exists in static storage.
5451 (This does not mean `static' in the C sense!) */
5452 TREE_STATIC (decl1) = 1;
5454 /* A nested function is not global. */
5455 if (current_function_decl != 0)
5456 TREE_PUBLIC (decl1) = 0;
5458 /* Record the decl so that the function name is defined.
5459 If we already have a decl for this name, and it is a FUNCTION_DECL,
5460 use the old decl. */
5462 current_function_decl = pushdecl (decl1);
5465 declare_parm_level (1);
5466 current_binding_level->subblocks_tag_transparent = 1;
5468 make_function_rtl (current_function_decl);
5470 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5471 /* Promote the value to int before returning it. */
5472 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5474 /* It retains unsignedness if traditional
5475 or if not really getting wider. */
5476 if (TREE_UNSIGNED (restype)
5477 && (flag_traditional
5478 || (TYPE_PRECISION (restype)
5479 == TYPE_PRECISION (integer_type_node))))
5480 restype = unsigned_type_node;
5482 restype = integer_type_node;
5484 DECL_RESULT (current_function_decl)
5485 = build_decl (RESULT_DECL, NULL_TREE, restype);
5488 /* Allocate further tree nodes temporarily during compilation
5489 of this function only. */
5490 temporary_allocation ();
5492 /* If this fcn was already referenced via a block-scope `extern' decl
5493 (or an implicit decl), propagate certain information about the usage. */
5494 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5495 TREE_ADDRESSABLE (current_function_decl) = 1;
5500 /* Record that this function is going to be a varargs function.
5501 This is called before store_parm_decls, which is too early
5502 to call mark_varargs directly. */
5507 c_function_varargs = 1;
5510 /* Store the parameter declarations into the current function declaration.
5511 This is called after parsing the parameter declarations, before
5512 digesting the body of the function.
5514 For an old-style definition, modify the function's type
5515 to specify at least the number of arguments. */
5520 register tree fndecl = current_function_decl;
5523 /* This is either a chain of PARM_DECLs (if a prototype was used)
5524 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5525 tree specparms = current_function_parms;
5527 /* This is a list of types declared among parms in a prototype. */
5528 tree parmtags = current_function_parm_tags;
5530 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5531 register tree parmdecls = getdecls ();
5533 /* This is a chain of any other decls that came in among the parm
5534 declarations. If a parm is declared with enum {foo, bar} x;
5535 then CONST_DECLs for foo and bar are put here. */
5538 /* Nonzero if this definition is written with a prototype. */
5541 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5543 /* This case is when the function was defined with an ANSI prototype.
5544 The parms already have decls, so we need not do anything here
5545 except record them as in effect
5546 and complain if any redundant old-style parm decls were written. */
5557 error_with_decl (fndecl,
5558 "parm types given both in parmlist and separately");
5559 /* Get rid of the erroneous decls; don't keep them on
5560 the list of parms, since they might not be PARM_DECLs. */
5561 for (decl = current_binding_level->names;
5562 decl; decl = TREE_CHAIN (decl))
5563 if (DECL_NAME (decl))
5564 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5565 for (link = current_binding_level->shadowed;
5566 link; link = TREE_CHAIN (link))
5567 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5568 current_binding_level->names = 0;
5569 current_binding_level->shadowed = 0;
5572 specparms = nreverse (specparms);
5573 for (parm = specparms; parm; parm = next)
5575 next = TREE_CHAIN (parm);
5576 if (TREE_CODE (parm) == PARM_DECL)
5578 if (DECL_NAME (parm) == 0)
5579 error_with_decl (parm, "parameter name omitted");
5580 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5582 error_with_decl (parm, "parameter `%s' declared void");
5583 /* Change the type to error_mark_node so this parameter
5584 will be ignored by assign_parms. */
5585 TREE_TYPE (parm) = error_mark_node;
5591 /* If we find an enum constant or a type tag,
5592 put it aside for the moment. */
5593 TREE_CHAIN (parm) = 0;
5594 others = chainon (others, parm);
5598 /* Get the decls in their original chain order
5599 and record in the function. */
5600 DECL_ARGUMENTS (fndecl) = getdecls ();
5603 /* If this function takes a variable number of arguments,
5604 add a phony parameter to the end of the parm list,
5605 to represent the position of the first unnamed argument. */
5606 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5609 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5610 /* Let's hope the address of the unnamed parm
5611 won't depend on its type. */
5612 TREE_TYPE (dummy) = integer_type_node;
5613 DECL_ARG_TYPE (dummy) = integer_type_node;
5614 DECL_ARGUMENTS (fndecl)
5615 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5619 /* Now pushdecl the enum constants. */
5620 for (parm = others; parm; parm = next)
5622 next = TREE_CHAIN (parm);
5623 if (DECL_NAME (parm) == 0)
5625 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5627 else if (TREE_CODE (parm) != PARM_DECL)
5631 storetags (chainon (parmtags, gettags ()));
5635 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5636 each with a parm name as the TREE_VALUE.
5638 PARMDECLS is a chain of declarations for parameters.
5639 Warning! It can also contain CONST_DECLs which are not parameters
5640 but are names of enumerators of any enum types
5641 declared among the parameters.
5643 First match each formal parameter name with its declaration.
5644 Associate decls with the names and store the decls
5645 into the TREE_PURPOSE slots. */
5647 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5648 DECL_RESULT (parm) = 0;
5650 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5652 register tree tail, found = NULL;
5654 if (TREE_VALUE (parm) == 0)
5656 error_with_decl (fndecl, "parameter name missing from parameter list");
5657 TREE_PURPOSE (parm) = 0;
5661 /* See if any of the parmdecls specifies this parm by name.
5662 Ignore any enumerator decls. */
5663 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5664 if (DECL_NAME (tail) == TREE_VALUE (parm)
5665 && TREE_CODE (tail) == PARM_DECL)
5671 /* If declaration already marked, we have a duplicate name.
5672 Complain, and don't use this decl twice. */
5673 if (found && DECL_RESULT (found) != 0)
5675 error_with_decl (found, "multiple parameters named `%s'");
5679 /* If the declaration says "void", complain and ignore it. */
5680 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5682 error_with_decl (found, "parameter `%s' declared void");
5683 TREE_TYPE (found) = integer_type_node;
5684 DECL_ARG_TYPE (found) = integer_type_node;
5685 layout_decl (found, 0);
5688 /* Traditionally, a parm declared float is actually a double. */
5689 if (found && flag_traditional
5690 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5691 TREE_TYPE (found) = double_type_node;
5693 /* If no declaration found, default to int. */
5696 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5698 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5699 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5700 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5702 warning_with_decl (found, "type of `%s' defaults to `int'");
5706 TREE_PURPOSE (parm) = found;
5708 /* Mark this decl as "already found" -- see test, above.
5709 It is safe to use DECL_RESULT for this
5710 since it is not used in PARM_DECLs or CONST_DECLs. */
5711 DECL_RESULT (found) = error_mark_node;
5714 /* Put anything which is on the parmdecls chain and which is
5715 not a PARM_DECL onto the list NONPARMS. (The types of
5716 non-parm things which might appear on the list include
5717 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5718 any actual PARM_DECLs not matched with any names. */
5721 for (parm = parmdecls; parm; )
5723 tree next = TREE_CHAIN (parm);
5724 TREE_CHAIN (parm) = 0;
5726 if (TREE_CODE (parm) != PARM_DECL)
5727 nonparms = chainon (nonparms, parm);
5730 /* Complain about args with incomplete types. */
5731 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5733 error_with_decl (parm, "parameter `%s' has incomplete type");
5734 TREE_TYPE (parm) = error_mark_node;
5737 if (DECL_RESULT (parm) == 0)
5739 error_with_decl (parm,
5740 "declaration for parameter `%s' but no such parameter");
5741 /* Pretend the parameter was not missing.
5742 This gets us to a standard state and minimizes
5743 further error messages. */
5745 = chainon (specparms,
5746 tree_cons (parm, NULL_TREE, NULL_TREE));
5753 /* Chain the declarations together in the order of the list of names. */
5754 /* Store that chain in the function decl, replacing the list of names. */
5756 DECL_ARGUMENTS (fndecl) = 0;
5759 for (last = 0; parm; parm = TREE_CHAIN (parm))
5760 if (TREE_PURPOSE (parm))
5763 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5765 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5766 last = TREE_PURPOSE (parm);
5767 TREE_CHAIN (last) = 0;
5771 /* If there was a previous prototype,
5772 set the DECL_ARG_TYPE of each argument according to
5773 the type previously specified, and report any mismatches. */
5775 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5778 for (parm = DECL_ARGUMENTS (fndecl),
5779 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5780 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5781 != void_type_node));
5782 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5784 if (parm == 0 || type == 0
5785 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5787 error ("number of arguments doesn't match prototype");
5790 /* Type for passing arg must be consistent
5791 with that declared for the arg. */
5792 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
5794 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5795 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5797 /* Adjust argument to match prototype. E.g. a previous
5798 `int foo(float);' prototype causes
5799 `int foo(x) float x; {...}' to be treated like
5800 `int foo(float x) {...}'. This is particularly
5801 useful for argument types like uid_t. */
5802 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5803 #ifdef PROMOTE_PROTOTYPES
5804 if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
5805 && TYPE_PRECISION (TREE_TYPE (parm))
5806 < TYPE_PRECISION (integer_type_node))
5807 DECL_ARG_TYPE (parm) = integer_type_node;
5810 warning ("promoted argument `%s' doesn't match prototype",
5811 IDENTIFIER_POINTER (DECL_NAME (parm)));
5813 /* If -traditional, allow `int' argument to match
5814 `unsigned' prototype. */
5815 else if (! (flag_traditional
5816 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
5817 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
5818 error ("argument `%s' doesn't match prototype",
5819 IDENTIFIER_POINTER (DECL_NAME (parm)));
5822 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5825 /* Otherwise, create a prototype that would match. */
5829 register tree actual, type;
5830 register tree last = 0;
5832 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5834 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
5837 TREE_CHAIN (last) = type;
5842 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5844 TREE_CHAIN (last) = type;
5848 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5849 of the type of this function, but we need to avoid having this
5850 affect the types of other similarly-typed functions, so we must
5851 first force the generation of an identical (but separate) type
5852 node for the relevant function type. The new node we create
5853 will be a variant of the main variant of the original function
5856 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5858 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5861 /* Now store the final chain of decls for the arguments
5862 as the decl-chain of the current lexical scope.
5863 Put the enumerators in as well, at the front so that
5864 DECL_ARGUMENTS is not modified. */
5866 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
5869 /* Make sure the binding level for the top of the function body
5870 gets a BLOCK if there are any in the function.
5871 Otherwise, the dbx output is wrong. */
5873 keep_next_if_subblocks = 1;
5875 /* ??? This might be an improvement,
5876 but needs to be thought about some more. */
5878 keep_next_level_flag = 1;
5881 /* Write a record describing this function definition to the prototypes
5882 file (if requested). */
5884 gen_aux_info_record (fndecl, 1, 0, prototype);
5886 /* Initialize the RTL code for the function. */
5888 init_function_start (fndecl, input_filename, lineno);
5890 /* If this is a varargs function, inform function.c. */
5892 if (c_function_varargs)
5895 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
5897 declare_function_name ();
5899 /* Set up parameters and prepare for return, for the function. */
5901 expand_function_start (fndecl, 0);
5903 /* If this function is `main', emit a call to `__main'
5904 to run global initializers, etc. */
5905 if (DECL_NAME (fndecl)
5906 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
5907 && DECL_CONTEXT (fndecl) == NULL_TREE)
5908 expand_main_function ();
5911 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5912 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
5913 stands for an ellipsis in the identifier list.
5915 PARMLIST is the data returned by get_parm_info for the
5916 parmlist that follows the semicolon.
5918 We return a value of the same sort that get_parm_info returns,
5919 except that it describes the combination of identifiers and parmlist. */
5922 combine_parm_decls (specparms, parmlist, void_at_end)
5923 tree specparms, parmlist;
5926 register tree fndecl = current_function_decl;
5929 tree parmdecls = TREE_PURPOSE (parmlist);
5931 /* This is a chain of any other decls that came in among the parm
5932 declarations. They were separated already by get_parm_info,
5933 so we just need to keep them separate. */
5934 tree nonparms = TREE_VALUE (parmlist);
5938 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5939 DECL_RESULT (parm) = 0;
5941 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5943 register tree tail, found = NULL;
5945 /* See if any of the parmdecls specifies this parm by name. */
5946 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5947 if (DECL_NAME (tail) == TREE_VALUE (parm))
5953 /* If declaration already marked, we have a duplicate name.
5954 Complain, and don't use this decl twice. */
5955 if (found && DECL_RESULT (found) != 0)
5957 error_with_decl (found, "multiple parameters named `%s'");
5961 /* If the declaration says "void", complain and ignore it. */
5962 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5964 error_with_decl (found, "parameter `%s' declared void");
5965 TREE_TYPE (found) = integer_type_node;
5966 DECL_ARG_TYPE (found) = integer_type_node;
5967 layout_decl (found, 0);
5970 /* Traditionally, a parm declared float is actually a double. */
5971 if (found && flag_traditional
5972 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5973 TREE_TYPE (found) = double_type_node;
5975 /* If no declaration found, default to int. */
5978 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5980 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5981 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5982 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5983 error (found, "type of parameter `%s' is not declared");
5987 TREE_PURPOSE (parm) = found;
5989 /* Mark this decl as "already found" -- see test, above.
5990 It is safe to use DECL_RESULT for this
5991 since it is not used in PARM_DECLs or CONST_DECLs. */
5992 DECL_RESULT (found) = error_mark_node;
5995 /* Complain about any actual PARM_DECLs not matched with any names. */
5997 for (parm = parmdecls; parm; )
5999 tree next = TREE_CHAIN (parm);
6000 TREE_CHAIN (parm) = 0;
6002 /* Complain about args with incomplete types. */
6003 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6005 error_with_decl (parm, "parameter `%s' has incomplete type");
6006 TREE_TYPE (parm) = error_mark_node;
6009 if (DECL_RESULT (parm) == 0)
6011 error_with_decl (parm,
6012 "declaration for parameter `%s' but no such parameter");
6013 /* Pretend the parameter was not missing.
6014 This gets us to a standard state and minimizes
6015 further error messages. */
6017 = chainon (specparms,
6018 tree_cons (parm, NULL_TREE, NULL_TREE));
6024 /* Chain the declarations together in the order of the list of names.
6025 At the same time, build up a list of their types, in reverse order. */
6031 for (last = 0; parm; parm = TREE_CHAIN (parm))
6032 if (TREE_PURPOSE (parm))
6035 parmdecls = TREE_PURPOSE (parm);
6037 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6038 last = TREE_PURPOSE (parm);
6039 TREE_CHAIN (last) = 0;
6041 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6046 return saveable_tree_cons (parmdecls, nonparms,
6047 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6049 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6052 /* Finish up a function declaration and compile that function
6053 all the way to assembler language output. The free the storage
6054 for the function definition.
6056 This is called after parsing the body of the function definition.
6058 NESTED is nonzero if the function being finished is nested in another. */
6061 finish_function (nested)
6064 register tree fndecl = current_function_decl;
6066 /* TREE_READONLY (fndecl) = 1;
6067 This caused &foo to be of type ptr-to-const-function
6068 which then got a warning when stored in a ptr-to-function variable. */
6071 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6073 /* Must mark the RESULT_DECL as being in this function. */
6075 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6077 /* Obey `register' declarations if `setjmp' is called in this fn. */
6078 if (flag_traditional && current_function_calls_setjmp)
6080 setjmp_protect (DECL_INITIAL (fndecl));
6081 setjmp_protect_args ();
6084 #ifdef DEFAULT_MAIN_RETURN
6085 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6087 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6088 != integer_type_node)
6089 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6092 /* Make it so that `main' always returns success by default. */
6093 DEFAULT_MAIN_RETURN;
6098 /* Generate rtl for function exit. */
6099 expand_function_end (input_filename, lineno);
6101 /* So we can tell if jump_optimize sets it to 1. */
6104 /* Run the optimizers and output the assembler code for this function. */
6105 rest_of_compilation (fndecl);
6107 current_function_returns_null |= can_reach_end;
6109 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6110 warning ("`volatile' function does return");
6111 else if (warn_return_type && can_reach_end
6112 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6113 /* If this function returns non-void and control can drop through,
6115 warning ("control reaches end of non-void function");
6116 /* With just -W, complain only if function returns both with
6117 and without a value. */
6118 else if (extra_warnings
6119 && current_function_returns_value && current_function_returns_null)
6120 warning ("this function may return with or without a value");
6122 /* Free all the tree nodes making up this function. */
6123 /* Switch back to allocating nodes permanently
6124 until we start another function. */
6126 permanent_allocation ();
6128 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6130 /* Stop pointing to the local nodes about to be freed. */
6131 /* But DECL_INITIAL must remain nonzero so we know this
6132 was an actual function definition. */
6133 /* For a nested function, this is done in pop_c_function_context. */
6134 DECL_INITIAL (fndecl) = error_mark_node;
6135 DECL_ARGUMENTS (fndecl) = 0;
6140 /* Let the error reporting routines know that we're outside a
6141 function. For a nested function, this value is used in
6142 pop_c_function_context and then reset via pop_function_context. */
6143 current_function_decl = NULL;
6147 /* Save and restore the variables in this file and elsewhere
6148 that keep track of the progress of compilation of the current function.
6149 Used for nested functions. */
6153 struct c_function *next;
6154 tree enum_next_value;
6156 tree shadowed_labels;
6159 int warn_about_return_type;
6161 struct binding_level *binding_level;
6164 struct c_function *c_function_chain;
6166 /* Save and reinitialize the variables
6167 used during compilation of a C function. */
6170 push_c_function_context ()
6172 struct c_function *p
6173 = (struct c_function *) xmalloc (sizeof (struct c_function));
6176 pedwarn ("ANSI C forbids nested functions");
6178 push_function_context ();
6180 p->next = c_function_chain;
6181 c_function_chain = p;
6183 p->enum_next_value = enum_next_value;
6184 p->named_labels = named_labels;
6185 p->shadowed_labels = shadowed_labels;
6186 p->returns_value = current_function_returns_value;
6187 p->returns_null = current_function_returns_null;
6188 p->warn_about_return_type = warn_about_return_type;
6189 p->extern_inline = current_extern_inline;
6190 p->binding_level = current_binding_level;
6193 /* Restore the variables used during compilation of a C function. */
6196 pop_c_function_context ()
6198 struct c_function *p = c_function_chain;
6201 /* Bring back all the labels that were shadowed. */
6202 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6203 if (DECL_NAME (TREE_VALUE (link)) != 0)
6204 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6205 = TREE_VALUE (link);
6207 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6209 /* Stop pointing to the local nodes about to be freed. */
6210 /* But DECL_INITIAL must remain nonzero so we know this
6211 was an actual function definition. */
6212 DECL_INITIAL (current_function_decl) = error_mark_node;
6213 DECL_ARGUMENTS (current_function_decl) = 0;
6216 pop_function_context ();
6218 c_function_chain = p->next;
6220 enum_next_value = p->enum_next_value;
6221 named_labels = p->named_labels;
6222 shadowed_labels = p->shadowed_labels;
6223 current_function_returns_value = p->returns_value;
6224 current_function_returns_null = p->returns_null;
6225 warn_about_return_type = p->warn_about_return_type;
6226 current_extern_inline = p->extern_inline;
6227 current_binding_level = p->binding_level;