1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
35 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
37 { NORMAL, /* Ordinary declaration */
38 FUNCDEF, /* Function definition */
39 PARM, /* Declaration of parm before function body */
40 FIELD, /* Declaration inside struct or union */
41 BITFIELD, /* Likewise but with specified width */
42 TYPENAME}; /* Typename (inside cast or sizeof) */
44 #ifndef CHAR_TYPE_SIZE
45 #define CHAR_TYPE_SIZE BITS_PER_UNIT
48 #ifndef SHORT_TYPE_SIZE
49 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
53 #define INT_TYPE_SIZE BITS_PER_WORD
56 #ifndef LONG_TYPE_SIZE
57 #define LONG_TYPE_SIZE BITS_PER_WORD
60 #ifndef LONG_LONG_TYPE_SIZE
61 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
64 #ifndef WCHAR_UNSIGNED
65 #define WCHAR_UNSIGNED 0
68 #ifndef FLOAT_TYPE_SIZE
69 #define FLOAT_TYPE_SIZE BITS_PER_WORD
72 #ifndef DOUBLE_TYPE_SIZE
73 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
76 #ifndef LONG_DOUBLE_TYPE_SIZE
77 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
80 /* We let tm.h override the types used here, to handle trivial differences
81 such as the choice of unsigned int or long unsigned int for size_t.
82 When machines start needing nontrivial differences in the size type,
83 it would be best to do something here to figure out automatically
84 from other information what type to use. */
87 #define SIZE_TYPE "long unsigned int"
91 #define PTRDIFF_TYPE "long int"
95 #define WCHAR_TYPE "int"
98 /* a node which has tree code ERROR_MARK, and whose type is itself.
99 All erroneous expressions are replaced with this node. All functions
100 that accept nodes as arguments should avoid generating error messages
101 if this node is one of the arguments, since it is undesirable to get
102 multiple error messages from one error in the input. */
104 tree error_mark_node;
106 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
108 tree short_integer_type_node;
109 tree integer_type_node;
110 tree long_integer_type_node;
111 tree long_long_integer_type_node;
113 tree short_unsigned_type_node;
114 tree unsigned_type_node;
115 tree long_unsigned_type_node;
116 tree long_long_unsigned_type_node;
118 tree ptrdiff_type_node;
120 tree unsigned_char_type_node;
121 tree signed_char_type_node;
123 tree wchar_type_node;
124 tree signed_wchar_type_node;
125 tree unsigned_wchar_type_node;
127 tree float_type_node;
128 tree double_type_node;
129 tree long_double_type_node;
131 tree intQI_type_node;
132 tree intHI_type_node;
133 tree intSI_type_node;
134 tree intDI_type_node;
136 tree unsigned_intQI_type_node;
137 tree unsigned_intHI_type_node;
138 tree unsigned_intSI_type_node;
139 tree unsigned_intDI_type_node;
141 /* a VOID_TYPE node. */
145 /* Nodes for types `void *' and `const void *'. */
147 tree ptr_type_node, const_ptr_type_node;
149 /* Nodes for types `char *' and `const char *'. */
151 tree string_type_node, const_string_type_node;
153 /* Type `char[256]' or something like it.
154 Used when an array of char is needed and the size is irrelevant. */
156 tree char_array_type_node;
158 /* Type `int[256]' or something like it.
159 Used when an array of int needed and the size is irrelevant. */
161 tree int_array_type_node;
163 /* Type `wchar_t[256]' or something like it.
164 Used when a wide string literal is created. */
166 tree wchar_array_type_node;
168 /* type `int ()' -- used for implicit declaration of functions. */
170 tree default_function_type;
172 /* function types `double (double)' and `double (double, double)', etc. */
174 tree double_ftype_double, double_ftype_double_double;
175 tree int_ftype_int, long_ftype_long;
177 /* Function type `void (void *, void *, int)' and similar ones */
179 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
181 /* Function type `char *(char *, char *)' and similar ones */
182 tree string_ftype_ptr_ptr, int_ftype_string_string;
184 /* Function type `int (const void *, const void *, size_t)' */
185 tree int_ftype_cptr_cptr_sizet;
187 /* Two expressions that are constants with value zero.
188 The first is of type `int', the second of type `void *'. */
190 tree integer_zero_node;
191 tree null_pointer_node;
193 /* A node for the integer constant 1. */
195 tree integer_one_node;
197 /* Nonzero if we have seen an invalid cross reference
198 to a struct, union, or enum, but not yet printed the message. */
200 tree pending_invalid_xref;
201 /* File and line to appear in the eventual error message. */
202 char *pending_invalid_xref_file;
203 int pending_invalid_xref_line;
205 /* While defining an enum type, this is 1 plus the last enumerator
208 static tree enum_next_value;
210 /* Nonzero means that there was overflow computing enum_next_value. */
212 static int enum_overflow;
214 /* Parsing a function declarator leaves a list of parameter names
215 or a chain or parameter decls here. */
217 static tree last_function_parms;
219 /* Parsing a function declarator leaves here a chain of structure
220 and enum types declared in the parmlist. */
222 static tree last_function_parm_tags;
224 /* After parsing the declarator that starts a function definition,
225 `start_function' puts here the list of parameter names or chain of decls.
226 `store_parm_decls' finds it here. */
228 static tree current_function_parms;
230 /* Similar, for last_function_parm_tags. */
231 static tree current_function_parm_tags;
233 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
234 that have names. Here so we can clear out their names' definitions
235 at the end of the function. */
237 static tree named_labels;
239 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
241 static tree shadowed_labels;
243 /* Nonzero when store_parm_decls is called indicates a varargs function.
244 Value not meaningful after store_parm_decls. */
246 static int c_function_varargs;
248 /* The FUNCTION_DECL for the function currently being compiled,
249 or 0 if between functions. */
250 tree current_function_decl;
252 /* Set to 0 at beginning of a function definition, set to 1 if
253 a return statement that specifies a return value is seen. */
255 int current_function_returns_value;
257 /* Set to 0 at beginning of a function definition, set to 1 if
258 a return statement with no argument is seen. */
260 int current_function_returns_null;
262 /* Set to nonzero by `grokdeclarator' for a function
263 whose return type is defaulted, if warnings for this are desired. */
265 static int warn_about_return_type;
267 /* Nonzero when starting a function declared `extern inline'. */
269 static int current_extern_inline;
271 /* For each binding contour we allocate a binding_level structure
272 * which records the names defined in that contour.
275 * 1) one for each function definition,
276 * where internal declarations of the parameters appear.
277 * 2) one for each compound statement,
278 * to record its declarations.
280 * The current meaning of a name can be found by searching the levels from
281 * the current one out to the global one.
284 /* Note that the information in the `names' component of the global contour
285 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
289 /* A chain of _DECL nodes for all variables, constants, functions,
290 and typedef types. These are in the reverse of the order supplied.
294 /* A list of structure, union and enum definitions,
295 * for looking up tag names.
296 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
297 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
298 * or ENUMERAL_TYPE node.
302 /* For each level, a list of shadowed outer-level local definitions
303 to be restored when this level is popped.
304 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
305 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
308 /* For each level (except not the global one),
309 a chain of BLOCK nodes for all the levels
310 that were entered and exited one level down. */
313 /* The BLOCK node for this level, if one has been preallocated.
314 If 0, the BLOCK is allocated (if needed) when the level is popped. */
317 /* The binding level which this one is contained in (inherits from). */
318 struct binding_level *level_chain;
320 /* Nonzero for the level that holds the parameters of a function. */
321 /* 2 for a definition, 1 for a declaration. */
324 /* Nonzero if this level "doesn't exist" for tags. */
325 char tag_transparent;
327 /* Nonzero if sublevels of this level "don't exist" for tags.
328 This is set in the parm level of a function definition
329 while reading the function body, so that the outermost block
330 of the function body will be tag-transparent. */
331 char subblocks_tag_transparent;
333 /* Nonzero means make a BLOCK for this level regardless of all else. */
336 /* Nonzero means make a BLOCK if this level has any subblocks. */
337 char keep_if_subblocks;
339 /* Number of decls in `names' that have incomplete
340 structure or union types. */
343 /* A list of decls giving the (reversed) specified order of parms,
344 not including any forward-decls in the parmlist.
345 This is so we can put the parms in proper order for assign_parms. */
349 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
351 /* The binding level currently in effect. */
353 static struct binding_level *current_binding_level;
355 /* A chain of binding_level structures awaiting reuse. */
357 static struct binding_level *free_binding_level;
359 /* The outermost binding level, for names of file scope.
360 This is created when the compiler is started and exists
361 through the entire run. */
363 static struct binding_level *global_binding_level;
365 /* Binding level structures are initialized by copying this one. */
367 static struct binding_level clear_binding_level
368 = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0};
370 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
372 static int keep_next_level_flag;
374 /* Nonzero means make a BLOCK for the next level pushed
375 if it has subblocks. */
377 static int keep_next_if_subblocks;
379 /* The chain of outer levels of label scopes.
380 This uses the same data structure used for binding levels,
381 but it works differently: each link in the chain records
382 saved values of named_labels and shadowed_labels for
383 a label binding level outside the current one. */
385 static struct binding_level *label_level_chain;
387 /* Forward declarations. */
389 static tree grokparms (), grokdeclarator ();
391 tree builtin_function ();
392 void shadow_tag_warned ();
394 static tree lookup_tag ();
395 static tree lookup_tag_reverse ();
396 static tree lookup_name_current_level ();
397 static char *redeclaration_error_message ();
398 static void layout_array_type ();
400 /* C-specific option variables. */
402 /* Nonzero means allow type mismatches in conditional expressions;
403 just make their values `void'. */
405 int flag_cond_mismatch;
407 /* Nonzero means give `double' the same size as `float'. */
409 int flag_short_double;
411 /* Nonzero means don't recognize the keyword `asm'. */
415 /* Nonzero means don't recognize any builtin functions. */
419 /* Nonzero means don't recognize the non-ANSI builtin functions.
422 int flag_no_nonansi_builtin;
424 /* Nonzero means do some things the same way PCC does. */
426 int flag_traditional;
428 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
430 int flag_signed_bitfields = 1;
431 int explicit_flag_signed_bitfields = 0;
433 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
435 int flag_no_ident = 0;
437 /* Nonzero means warn about implicit declarations. */
441 /* Nonzero means give string constants the type `const char *'
442 to get extra warnings from them. These warnings will be too numerous
443 to be useful, except in thoroughly ANSIfied programs. */
445 int warn_write_strings;
447 /* Nonzero means warn about pointer casts that can drop a type qualifier
448 from the pointer target type. */
452 /* Warn about traditional constructs whose meanings changed in ANSI C. */
454 int warn_traditional;
456 /* Nonzero means warn about sizeof(function) or addition/subtraction
457 of function pointers. */
459 int warn_pointer_arith;
461 /* Nonzero means warn for non-prototype function decls
462 or non-prototyped defs without previous prototype. */
464 int warn_strict_prototypes;
466 /* Nonzero means warn for any global function def
467 without separate previous prototype decl. */
469 int warn_missing_prototypes;
471 /* Nonzero means warn about multiple (redundant) decls for the same single
472 variable or function. */
474 int warn_redundant_decls = 0;
476 /* Nonzero means warn about extern declarations of objects not at
477 file-scope level and about *all* declarations of functions (whether
478 extern or static) not at file-scope level. Note that we exclude
479 implicit function declarations. To get warnings about those, use
482 int warn_nested_externs = 0;
484 /* Warn about *printf or *scanf format/argument anomalies. */
488 /* Warn about a subscript that has type char. */
490 int warn_char_subscripts = 0;
492 /* Warn if a type conversion is done that might have confusing results. */
496 /* Warn if adding () is suggested. */
498 int warn_parentheses;
500 /* Nonzero means `$' can be in an identifier.
501 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
503 #ifndef DOLLARS_IN_IDENTIFIERS
504 #define DOLLARS_IN_IDENTIFIERS 1
506 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
508 char *language_string = "GNU C";
510 /* Decode the string P as a language-specific option for C.
511 Return 1 if it is recognized (and handle it);
512 return 0 if not recognized. */
518 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
520 flag_traditional = 1;
521 flag_writable_strings = 1;
522 #if DOLLARS_IN_IDENTIFIERS > 0
523 dollars_in_ident = 1;
526 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
528 flag_traditional = 0;
529 flag_writable_strings = 0;
530 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
532 else if (!strcmp (p, "-fsigned-char"))
533 flag_signed_char = 1;
534 else if (!strcmp (p, "-funsigned-char"))
535 flag_signed_char = 0;
536 else if (!strcmp (p, "-fno-signed-char"))
537 flag_signed_char = 0;
538 else if (!strcmp (p, "-fno-unsigned-char"))
539 flag_signed_char = 1;
540 else if (!strcmp (p, "-fsigned-bitfields")
541 || !strcmp (p, "-fno-unsigned-bitfields"))
543 flag_signed_bitfields = 1;
544 explicit_flag_signed_bitfields = 1;
546 else if (!strcmp (p, "-funsigned-bitfields")
547 || !strcmp (p, "-fno-signed-bitfields"))
549 flag_signed_bitfields = 0;
550 explicit_flag_signed_bitfields = 1;
552 else if (!strcmp (p, "-fshort-enums"))
553 flag_short_enums = 1;
554 else if (!strcmp (p, "-fno-short-enums"))
555 flag_short_enums = 0;
556 else if (!strcmp (p, "-fcond-mismatch"))
557 flag_cond_mismatch = 1;
558 else if (!strcmp (p, "-fno-cond-mismatch"))
559 flag_cond_mismatch = 0;
560 else if (!strcmp (p, "-fshort-double"))
561 flag_short_double = 1;
562 else if (!strcmp (p, "-fno-short-double"))
563 flag_short_double = 0;
564 else if (!strcmp (p, "-fasm"))
566 else if (!strcmp (p, "-fno-asm"))
568 else if (!strcmp (p, "-fbuiltin"))
570 else if (!strcmp (p, "-fno-builtin"))
572 else if (!strcmp (p, "-fno-ident"))
574 else if (!strcmp (p, "-fident"))
576 else if (!strcmp (p, "-ansi"))
577 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
578 else if (!strcmp (p, "-Wimplicit"))
580 else if (!strcmp (p, "-Wno-implicit"))
582 else if (!strcmp (p, "-Wwrite-strings"))
583 warn_write_strings = 1;
584 else if (!strcmp (p, "-Wno-write-strings"))
585 warn_write_strings = 0;
586 else if (!strcmp (p, "-Wcast-qual"))
588 else if (!strcmp (p, "-Wno-cast-qual"))
590 else if (!strcmp (p, "-Wpointer-arith"))
591 warn_pointer_arith = 1;
592 else if (!strcmp (p, "-Wno-pointer-arith"))
593 warn_pointer_arith = 0;
594 else if (!strcmp (p, "-Wstrict-prototypes"))
595 warn_strict_prototypes = 1;
596 else if (!strcmp (p, "-Wno-strict-prototypes"))
597 warn_strict_prototypes = 0;
598 else if (!strcmp (p, "-Wmissing-prototypes"))
599 warn_missing_prototypes = 1;
600 else if (!strcmp (p, "-Wno-missing-prototypes"))
601 warn_missing_prototypes = 0;
602 else if (!strcmp (p, "-Wredundant-decls"))
603 warn_redundant_decls = 1;
604 else if (!strcmp (p, "-Wno-redundant-decls"))
605 warn_redundant_decls = 0;
606 else if (!strcmp (p, "-Wnested-externs"))
607 warn_nested_externs = 1;
608 else if (!strcmp (p, "-Wno-nested-externs"))
609 warn_nested_externs = 0;
610 else if (!strcmp (p, "-Wtraditional"))
611 warn_traditional = 1;
612 else if (!strcmp (p, "-Wno-traditional"))
613 warn_traditional = 0;
614 else if (!strcmp (p, "-Wformat"))
616 else if (!strcmp (p, "-Wno-format"))
618 else if (!strcmp (p, "-Wchar-subscripts"))
619 warn_char_subscripts = 1;
620 else if (!strcmp (p, "-Wno-char-subscripts"))
621 warn_char_subscripts = 0;
622 else if (!strcmp (p, "-Wconversion"))
624 else if (!strcmp (p, "-Wno-conversion"))
626 else if (!strcmp (p, "-Wparentheses"))
627 warn_parentheses = 1;
628 else if (!strcmp (p, "-Wno-parentheses"))
629 warn_parentheses = 0;
630 else if (!strcmp (p, "-Wreturn-type"))
631 warn_return_type = 1;
632 else if (!strcmp (p, "-Wno-return-type"))
633 warn_return_type = 0;
634 else if (!strcmp (p, "-Wcomment"))
635 ; /* cpp handles this one. */
636 else if (!strcmp (p, "-Wno-comment"))
637 ; /* cpp handles this one. */
638 else if (!strcmp (p, "-Wcomments"))
639 ; /* cpp handles this one. */
640 else if (!strcmp (p, "-Wno-comments"))
641 ; /* cpp handles this one. */
642 else if (!strcmp (p, "-Wtrigraphs"))
643 ; /* cpp handles this one. */
644 else if (!strcmp (p, "-Wno-trigraphs"))
645 ; /* cpp handles this one. */
646 else if (!strcmp (p, "-Wimport"))
647 ; /* cpp handles this one. */
648 else if (!strcmp (p, "-Wno-import"))
649 ; /* cpp handles this one. */
650 else if (!strcmp (p, "-Wall"))
653 warn_uninitialized = 1;
655 warn_return_type = 1;
659 warn_char_subscripts = 1;
660 warn_parentheses = 1;
668 /* Hooks for print_node. */
681 print_lang_identifier (file, node, indent)
686 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
687 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
688 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
689 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
690 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
691 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
694 /* Create a new `struct binding_level'. */
697 struct binding_level *
698 make_binding_level ()
701 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
704 /* Nonzero if we are currently in the global binding level. */
709 return current_binding_level == global_binding_level;
715 keep_next_level_flag = 1;
718 /* Nonzero if the current level needs to have a BLOCK made. */
723 return ((current_binding_level->keep_if_subblocks
724 && current_binding_level->blocks != 0)
725 || current_binding_level->keep
726 || current_binding_level->names != 0
727 || (current_binding_level->tags != 0
728 && !current_binding_level->tag_transparent));
731 /* Identify this binding level as a level of parameters.
732 DEFINITION_FLAG is 1 for a definition, 0 for a declaration. */
735 declare_parm_level (definition_flag)
738 current_binding_level->parm_flag = 1 + definition_flag;
741 /* Nonzero if currently making parm declarations. */
746 return current_binding_level->parm_flag;
749 /* Enter a new binding level.
750 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
751 not for that of tags. */
754 pushlevel (tag_transparent)
757 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
759 /* If this is the top level of a function,
760 just make sure that NAMED_LABELS is 0. */
762 if (current_binding_level == global_binding_level)
767 /* Reuse or create a struct for this binding level. */
769 if (free_binding_level)
771 newlevel = free_binding_level;
772 free_binding_level = free_binding_level->level_chain;
776 newlevel = make_binding_level ();
779 /* Add this level to the front of the chain (stack) of levels that
782 *newlevel = clear_binding_level;
783 newlevel->tag_transparent
785 || (current_binding_level
786 ? current_binding_level->subblocks_tag_transparent
788 newlevel->level_chain = current_binding_level;
789 current_binding_level = newlevel;
790 newlevel->keep = keep_next_level_flag;
791 keep_next_level_flag = 0;
792 newlevel->keep_if_subblocks = keep_next_if_subblocks;
793 keep_next_if_subblocks = 0;
796 /* Exit a binding level.
797 Pop the level off, and restore the state of the identifier-decl mappings
798 that were in effect when this level was entered.
800 If KEEP is nonzero, this level had explicit declarations, so
801 and create a "block" (a BLOCK node) for the level
802 to record its declarations and subblocks for symbol table output.
804 If FUNCTIONBODY is nonzero, this level is the body of a function,
805 so create a block as if KEEP were set and also clear out all
808 If REVERSE is nonzero, reverse the order of decls before putting
809 them into the BLOCK. */
812 poplevel (keep, reverse, functionbody)
818 /* The chain of decls was accumulated in reverse order.
819 Put it into forward order, just for cleanliness. */
821 tree tags = current_binding_level->tags;
822 tree subblocks = current_binding_level->blocks;
825 int block_previously_created;
827 keep |= current_binding_level->keep;
829 /* This warning is turned off because it causes warnings for
830 declarations like `extern struct foo *x'. */
832 /* Warn about incomplete structure types in this level. */
833 for (link = tags; link; link = TREE_CHAIN (link))
834 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
836 tree type = TREE_VALUE (link);
838 switch (TREE_CODE (type))
841 errmsg = "`struct %s' incomplete in scope ending here";
844 errmsg = "`union %s' incomplete in scope ending here";
847 errmsg = "`enum %s' incomplete in scope ending here";
850 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
851 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
853 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
854 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
858 /* Get the decls in the order they were written.
859 Usually current_binding_level->names is in reverse order.
860 But parameter decls were previously put in forward order. */
863 current_binding_level->names
864 = decls = nreverse (current_binding_level->names);
866 decls = current_binding_level->names;
868 /* Output any nested inline functions within this block
869 if they weren't already output. */
871 for (decl = decls; decl; decl = TREE_CHAIN (decl))
872 if (TREE_CODE (decl) == FUNCTION_DECL
873 && ! TREE_ASM_WRITTEN (decl)
874 && DECL_INITIAL (decl) != 0
875 && TREE_ADDRESSABLE (decl))
877 /* If this decl was copied from a file-scope decl
878 on account of a block-scope extern decl,
879 propagate TREE_ADDRESSABLE to the file-scope decl. */
880 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
881 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
883 output_inline_function (decl);
886 /* If there were any declarations or structure tags in that level,
887 or if this level is a function body,
888 create a BLOCK to record them for the life of this function. */
891 block_previously_created = (current_binding_level->this_block != 0);
892 if (block_previously_created)
893 block = current_binding_level->this_block;
894 else if (keep || functionbody
895 || (current_binding_level->keep_if_subblocks && subblocks != 0))
896 block = make_node (BLOCK);
899 BLOCK_VARS (block) = decls;
900 BLOCK_TYPE_TAGS (block) = tags;
901 BLOCK_SUBBLOCKS (block) = subblocks;
902 remember_end_note (block);
905 /* In each subblock, record that this is its superior. */
907 for (link = subblocks; link; link = TREE_CHAIN (link))
908 BLOCK_SUPERCONTEXT (link) = block;
910 /* Clear out the meanings of the local variables of this level. */
912 for (link = decls; link; link = TREE_CHAIN (link))
914 if (DECL_NAME (link) != 0)
916 /* If the ident. was used or addressed via a local extern decl,
917 don't forget that fact. */
918 if (DECL_EXTERNAL (link))
920 if (TREE_USED (link))
921 TREE_USED (DECL_NAME (link)) = 1;
922 if (TREE_ADDRESSABLE (link))
923 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
925 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
929 /* Restore all name-meanings of the outer levels
930 that were shadowed by this level. */
932 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
933 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
935 /* If the level being exited is the top level of a function,
936 check over all the labels, and clear out the current
937 (function local) meanings of their names. */
941 /* If this is the top level block of a function,
942 the vars are the function's parameters.
943 Don't leave them in the BLOCK because they are
944 found in the FUNCTION_DECL instead. */
946 BLOCK_VARS (block) = 0;
948 /* Clear out the definitions of all label names,
949 since their scopes end here,
950 and add them to BLOCK_VARS. */
952 for (link = named_labels; link; link = TREE_CHAIN (link))
954 register tree label = TREE_VALUE (link);
956 if (DECL_INITIAL (label) == 0)
958 error_with_decl (label, "label `%s' used but not defined");
959 /* Avoid crashing later. */
960 define_label (input_filename, lineno,
963 else if (warn_unused && !TREE_USED (label))
964 warning_with_decl (label, "label `%s' defined but not used");
965 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
967 /* Put the labels into the "variables" of the
968 top-level block, so debugger can see them. */
969 TREE_CHAIN (label) = BLOCK_VARS (block);
970 BLOCK_VARS (block) = label;
974 /* Pop the current level, and free the structure for reuse. */
977 register struct binding_level *level = current_binding_level;
978 current_binding_level = current_binding_level->level_chain;
980 level->level_chain = free_binding_level;
981 free_binding_level = level;
984 /* Dispose of the block that we just made inside some higher level. */
986 DECL_INITIAL (current_function_decl) = block;
989 if (!block_previously_created)
990 current_binding_level->blocks
991 = chainon (current_binding_level->blocks, block);
993 /* If we did not make a block for the level just exited,
994 any blocks made for inner levels
995 (since they cannot be recorded as subblocks in that level)
996 must be carried forward so they will later become subblocks
997 of something else. */
999 current_binding_level->blocks
1000 = chainon (current_binding_level->blocks, subblocks);
1002 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1003 binding contour so that they point to the appropriate construct, i.e.
1004 either to the current FUNCTION_DECL node, or else to the BLOCK node
1005 we just constructed.
1007 Note that for tagged types whose scope is just the formal parameter
1008 list for some function type specification, we can't properly set
1009 their TYPE_CONTEXTs here, because we don't have a pointer to the
1010 appropriate FUNCTION_TYPE node readily available to us. For those
1011 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1012 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1013 node which will represent the "scope" for these "parameter list local"
1018 for (link = tags; link; link = TREE_CHAIN (link))
1019 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1021 for (link = tags; link; link = TREE_CHAIN (link))
1022 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1025 TREE_USED (block) = 1;
1029 /* Delete the node BLOCK from the current binding level.
1030 This is used for the block inside a stmt expr ({...})
1031 so that the block can be reinserted where appropriate. */
1034 delete_block (block)
1038 if (current_binding_level->blocks == block)
1039 current_binding_level->blocks = TREE_CHAIN (block);
1040 for (t = current_binding_level->blocks; t;)
1042 if (TREE_CHAIN (t) == block)
1043 TREE_CHAIN (t) = TREE_CHAIN (block);
1047 TREE_CHAIN (block) = NULL;
1048 /* Clear TREE_USED which is always set by poplevel.
1049 The flag is set again if insert_block is called. */
1050 TREE_USED (block) = 0;
1053 /* Insert BLOCK at the end of the list of subblocks of the
1054 current binding level. This is used when a BIND_EXPR is expanded,
1055 to handle the BLOCK node inside teh BIND_EXPR. */
1058 insert_block (block)
1061 TREE_USED (block) = 1;
1062 current_binding_level->blocks
1063 = chainon (current_binding_level->blocks, block);
1066 /* Set the BLOCK node for the innermost scope
1067 (the one we are currently in). */
1071 register tree block;
1073 current_binding_level->this_block = block;
1079 register struct binding_level *newlevel;
1081 /* Reuse or create a struct for this binding level. */
1083 if (free_binding_level)
1085 newlevel = free_binding_level;
1086 free_binding_level = free_binding_level->level_chain;
1090 newlevel = make_binding_level ();
1093 /* Add this level to the front of the chain (stack) of label levels. */
1095 newlevel->level_chain = label_level_chain;
1096 label_level_chain = newlevel;
1098 newlevel->names = named_labels;
1099 newlevel->shadowed = shadowed_labels;
1101 shadowed_labels = 0;
1107 register struct binding_level *level = label_level_chain;
1110 /* Clear out the definitions of the declared labels in this level.
1111 Leave in the list any ordinary, non-declared labels. */
1112 for (link = named_labels, prev = 0; link;)
1114 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1116 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1118 error_with_decl ("label `%s' used but not defined",
1120 /* Avoid crashing later. */
1121 define_label (input_filename, lineno,
1122 DECL_NAME (TREE_VALUE (link)));
1124 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1125 warning_with_decl (TREE_VALUE (link),
1126 "label `%s' defined but not used");
1127 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1129 /* Delete this element from the list. */
1130 link = TREE_CHAIN (link);
1132 TREE_CHAIN (prev) = link;
1134 named_labels = link;
1139 link = TREE_CHAIN (link);
1143 /* Bring back all the labels that were shadowed. */
1144 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1145 if (DECL_NAME (TREE_VALUE (link)) != 0)
1146 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1147 = TREE_VALUE (link);
1149 named_labels = chainon (named_labels, level->names);
1150 shadowed_labels = level->shadowed;
1152 /* Pop the current level, and free the structure for reuse. */
1153 label_level_chain = label_level_chain->level_chain;
1154 level->level_chain = free_binding_level;
1155 free_binding_level = level;
1158 /* Push a definition or a declaration of struct, union or enum tag "name".
1159 "type" should be the type node.
1160 We assume that the tag "name" is not already defined.
1162 Note that the definition may really be just a forward reference.
1163 In that case, the TYPE_SIZE will be zero. */
1166 pushtag (name, type)
1169 register struct binding_level *b;
1171 /* Find the proper binding level for this type tag. */
1173 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1178 /* Record the identifier as the type's name if it has none. */
1180 if (TYPE_NAME (type) == 0)
1181 TYPE_NAME (type) = name;
1184 if (b == global_binding_level)
1185 b->tags = perm_tree_cons (name, type, b->tags);
1187 b->tags = saveable_tree_cons (name, type, b->tags);
1189 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1190 tagged type we just added to the current binding level. This fake
1191 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1192 to output a representation of a tagged type, and it also gives
1193 us a convenient place to record the "scope start" address for the
1196 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1199 /* Handle when a new declaration NEWDECL
1200 has the same name as an old one OLDDECL
1201 in the same binding contour.
1202 Prints an error message if appropriate.
1204 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1205 Otherwise, return 0. */
1208 duplicate_decls (newdecl, olddecl)
1209 register tree newdecl, olddecl;
1211 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1212 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1213 && DECL_INITIAL (newdecl) != 0);
1214 tree oldtype = TREE_TYPE (olddecl);
1215 tree newtype = TREE_TYPE (newdecl);
1217 if (TREE_CODE (newtype) == ERROR_MARK
1218 || TREE_CODE (oldtype) == ERROR_MARK)
1221 /* New decl is completely inconsistent with the old one =>
1222 tell caller to replace the old one.
1223 This is always an error except in the case of shadowing a builtin. */
1224 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1226 if (TREE_CODE (olddecl) == FUNCTION_DECL
1227 && DECL_BUILT_IN (olddecl))
1229 /* If you declare a built-in function name as static, the
1230 built-in definition is overridden,
1231 but optionally warn this was a bad choice of name. */
1232 if (!TREE_PUBLIC (newdecl))
1235 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1237 /* Likewise, if the built-in is not ansi, then programs can
1238 override it even globally without an error. */
1239 else if (DECL_BUILT_IN_NONANSI (olddecl))
1240 warning_with_decl (newdecl,
1241 "built-in function `%s' declared as non-function");
1243 error_with_decl (newdecl,
1244 "built-in function `%s' declared as non-function");
1246 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1247 && DECL_BUILT_IN_NONANSI (olddecl))
1249 /* If overriding decl is static,
1250 optionally warn this was a bad choice of name. */
1251 if (!TREE_PUBLIC (newdecl))
1254 warning_with_decl (newdecl, "shadowing library function `%s'");
1256 /* Otherwise, always warn. */
1258 warning_with_decl (newdecl,
1259 "library function `%s' declared as non-function");
1263 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1264 error_with_decl (olddecl, "previous declaration of `%s'");
1270 /* For real parm decl following a forward decl,
1271 return 1 so old decl will be reused. */
1272 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1273 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1276 /* The new declaration is the same kind of object as the old one.
1277 The declarations may partially match. Print warnings if they don't
1278 match enough. Ultimately, copy most of the information from the new
1279 decl to the old one, and keep using the old one. */
1281 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1282 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1283 && DECL_INITIAL (olddecl) == 0)
1284 /* If -traditional, avoid error for redeclaring fcn
1285 after implicit decl. */
1287 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1288 && DECL_BUILT_IN (olddecl))
1290 /* A function declaration for a built-in function. */
1291 if (!TREE_PUBLIC (newdecl))
1293 /* If you declare a built-in function name as static, the
1294 built-in definition is overridden,
1295 but optionally warn this was a bad choice of name. */
1297 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1298 /* Discard the old built-in function. */
1301 else if (!types_match)
1303 /* Accept the return type of the new declaration if same modes. */
1304 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1305 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1306 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1308 /* Function types may be shared, so we can't just modify
1309 the return type of olddecl's function type. */
1311 = build_function_type (newreturntype,
1312 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1314 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1316 TREE_TYPE (olddecl) = newtype;
1321 /* If types don't match for a built-in, throw away the built-in. */
1322 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1326 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1327 && DECL_SOURCE_LINE (olddecl) == 0)
1329 /* A function declaration for a predeclared function
1330 that isn't actually built in. */
1331 if (!TREE_PUBLIC (newdecl))
1333 /* If you declare it as static, the
1334 default definition is overridden. */
1337 else if (!types_match)
1339 /* If the types don't match, preserve volatility indication.
1340 Later on, we will discard everything else about the
1341 default declaration. */
1342 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1345 /* Permit char *foo () to match void *foo (...) if not pedantic,
1346 if one of them came from a system header file. */
1347 else if (!types_match
1348 && TREE_CODE (olddecl) == FUNCTION_DECL
1349 && TREE_CODE (newdecl) == FUNCTION_DECL
1350 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1351 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1352 && (DECL_IN_SYSTEM_HEADER (olddecl)
1353 || DECL_IN_SYSTEM_HEADER (newdecl))
1354 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1355 && TYPE_ARG_TYPES (oldtype) == 0
1356 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1357 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1359 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1360 && TYPE_ARG_TYPES (newtype) == 0
1361 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1362 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1365 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1366 /* Make sure we keep void * as ret type, not char *. */
1367 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1368 TREE_TYPE (newdecl) = newtype = oldtype;
1370 else if (!types_match
1371 /* Permit char *foo (int, ...); followed by char *foo ();
1373 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1375 /* Return types must still match. */
1376 && comptypes (TREE_TYPE (oldtype),
1377 TREE_TYPE (newtype))
1378 && TYPE_ARG_TYPES (newtype) == 0))
1380 error_with_decl (newdecl, "conflicting types for `%s'");
1381 /* Check for function type mismatch
1382 involving an empty arglist vs a nonempty one. */
1383 if (TREE_CODE (olddecl) == FUNCTION_DECL
1384 && comptypes (TREE_TYPE (oldtype),
1385 TREE_TYPE (newtype))
1386 && ((TYPE_ARG_TYPES (oldtype) == 0
1387 && DECL_INITIAL (olddecl) == 0)
1389 (TYPE_ARG_TYPES (newtype) == 0
1390 && DECL_INITIAL (newdecl) == 0)))
1392 /* Classify the problem further. */
1393 register tree t = TYPE_ARG_TYPES (oldtype);
1395 t = TYPE_ARG_TYPES (newtype);
1396 for (; t; t = TREE_CHAIN (t))
1398 register tree type = TREE_VALUE (t);
1400 if (TREE_CHAIN (t) == 0
1401 && TYPE_MAIN_VARIANT (type) != void_type_node)
1403 error ("A parameter list with an ellipsis can't match");
1404 error ("an empty parameter name list declaration.");
1408 if (TYPE_MAIN_VARIANT (type) == float_type_node
1409 || C_PROMOTING_INTEGER_TYPE_P (type))
1411 error ("An argument type that has a default promotion");
1412 error ("can't match an empty parameter name list declaration.");
1417 error_with_decl (olddecl, "previous declaration of `%s'");
1421 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1424 error_with_decl (newdecl, errmsg);
1425 error_with_decl (olddecl,
1426 ((DECL_INITIAL (olddecl)
1427 && current_binding_level == global_binding_level)
1428 ? "`%s' previously defined here"
1429 : "`%s' previously declared here"));
1431 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1432 && DECL_INITIAL (olddecl) != 0
1433 && TYPE_ARG_TYPES (oldtype) == 0
1434 && TYPE_ARG_TYPES (newtype) != 0)
1436 register tree type, parm;
1438 /* Prototype decl follows defn w/o prototype. */
1440 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1441 type = TYPE_ARG_TYPES (newtype),
1443 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1444 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1445 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1447 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1448 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1450 errmsg = "prototype for `%s' follows and number of arguments";
1453 /* Type for passing arg must be consistent
1454 with that declared for the arg. */
1455 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1456 /* If -traditional, allow `unsigned int' instead of `int'
1457 in the prototype. */
1458 && (! (flag_traditional
1459 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1460 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1462 errmsg = "prototype for `%s' follows and argument %d";
1468 error_with_decl (newdecl, errmsg, nargs);
1469 error_with_decl (olddecl,
1470 "doesn't match non-prototype definition here");
1474 warning_with_decl (newdecl, "prototype for `%s' follows");
1475 warning_with_decl (olddecl, "non-prototype definition here");
1478 /* Warn about mismatches in various flags. */
1481 /* Warn if function is now inline
1482 but was previously declared not inline and has been called. */
1483 if (TREE_CODE (olddecl) == FUNCTION_DECL
1484 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1485 && TREE_USED (olddecl))
1486 warning_with_decl (newdecl,
1487 "`%s' declared inline after being called");
1488 if (TREE_CODE (olddecl) == FUNCTION_DECL
1489 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1490 && DECL_INITIAL (olddecl) != 0)
1491 warning_with_decl (newdecl,
1492 "`%s' declared inline after its definition");
1493 /* It is nice to warn when a function is declared
1494 global first and then static. */
1495 if (TREE_CODE (olddecl) == FUNCTION_DECL
1496 && TREE_PUBLIC (olddecl)
1497 && !TREE_PUBLIC (newdecl))
1498 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1500 /* These bits are logically part of the type, for variables.
1501 But not for functions
1502 (where qualifiers are not valid ANSI anyway). */
1503 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1504 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1505 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1506 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1510 /* Optionally warn about more than one declaration for the same name. */
1511 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1512 /* Dont warn about a function declaration
1513 followed by a definition. */
1514 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1515 && DECL_INITIAL (olddecl) == 0))
1517 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1518 warning_with_decl (olddecl, "previous declaration of `%s'");
1521 /* Copy all the DECL_... slots specified in the new decl
1522 except for any that we copy here from the old type.
1524 Past this point, we don't change OLDTYPE and NEWTYPE
1525 even if we change the types of NEWDECL and OLDDECL. */
1529 /* Merge the data types specified in the two decls. */
1530 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1532 = TREE_TYPE (olddecl)
1533 = common_type (newtype, oldtype);
1535 /* Lay the type out, unless already done. */
1536 if (oldtype != TREE_TYPE (newdecl))
1538 if (TREE_TYPE (newdecl) != error_mark_node)
1539 layout_type (TREE_TYPE (newdecl));
1540 if (TREE_CODE (newdecl) != FUNCTION_DECL
1541 && TREE_CODE (newdecl) != TYPE_DECL
1542 && TREE_CODE (newdecl) != CONST_DECL)
1543 layout_decl (newdecl, 0);
1547 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1548 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1549 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1550 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1551 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1554 /* Keep the old rtl since we can safely use it. */
1555 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1557 /* Merge the type qualifiers. */
1558 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1559 && !TREE_THIS_VOLATILE (newdecl))
1560 TREE_THIS_VOLATILE (olddecl) = 0;
1561 if (TREE_READONLY (newdecl))
1562 TREE_READONLY (olddecl) = 1;
1563 if (TREE_THIS_VOLATILE (newdecl))
1565 TREE_THIS_VOLATILE (olddecl) = 1;
1566 if (TREE_CODE (newdecl) == VAR_DECL)
1567 make_var_volatile (newdecl);
1570 /* Keep source location of definition rather than declaration. */
1571 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1573 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1574 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1577 /* Merge the unused-warning information. */
1578 if (DECL_IN_SYSTEM_HEADER (olddecl))
1579 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1580 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1581 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1583 /* Merge the initialization information. */
1584 if (DECL_INITIAL (newdecl) == 0)
1585 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1587 /* If cannot merge, then use the new type and qualifiers,
1588 and don't preserve the old rtl. */
1591 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1592 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1593 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1594 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1597 /* Merge the storage class information. */
1598 /* For functions, static overrides non-static. */
1599 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1601 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1602 /* This is since we don't automatically
1603 copy the attributes of NEWDECL into OLDDECL. */
1604 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1605 /* If this clears `static', clear it in the identifier too. */
1606 if (! TREE_PUBLIC (olddecl))
1607 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1609 if (DECL_EXTERNAL (newdecl))
1611 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1612 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1613 /* An extern decl does not override previous storage class. */
1614 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1618 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1619 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1622 /* If either decl says `inline', this fn is inline,
1623 unless its definition was passed already. */
1624 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1625 DECL_INLINE (olddecl) = 1;
1626 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1628 /* Get rid of any built-in function if new arg types don't match it
1629 or if we have a function definition. */
1630 if (TREE_CODE (newdecl) == FUNCTION_DECL
1631 && DECL_BUILT_IN (olddecl)
1632 && (!types_match || new_is_definition))
1634 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1635 DECL_BUILT_IN (olddecl) = 0;
1638 /* If redeclaring a builtin function, and not a definition,
1640 Also preserve various other info from the definition. */
1641 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1643 if (DECL_BUILT_IN (olddecl))
1645 DECL_BUILT_IN (newdecl) = 1;
1646 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1649 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1651 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1652 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1653 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1654 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1657 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1658 But preserve OLDdECL's DECL_UID. */
1660 register unsigned olddecl_uid = DECL_UID (olddecl);
1662 bcopy ((char *) newdecl + sizeof (struct tree_common),
1663 (char *) olddecl + sizeof (struct tree_common),
1664 sizeof (struct tree_decl) - sizeof (struct tree_common));
1665 DECL_UID (olddecl) = olddecl_uid;
1671 /* Record a decl-node X as belonging to the current lexical scope.
1672 Check for errors (such as an incompatible declaration for the same
1673 name already seen in the same scope).
1675 Returns either X or an old decl for the same name.
1676 If an old decl is returned, it may have been smashed
1677 to agree with what X says. */
1684 register tree name = DECL_NAME (x);
1685 register struct binding_level *b = current_binding_level;
1687 DECL_CONTEXT (x) = current_function_decl;
1688 /* A local declaration for a function doesn't constitute nesting. */
1689 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0)
1690 DECL_CONTEXT (x) = 0;
1692 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1693 && x != IDENTIFIER_IMPLICIT_DECL (name))
1694 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1701 t = lookup_name_current_level (name);
1702 if (t != 0 && t == error_mark_node)
1703 /* error_mark_node is 0 for a while during initialization! */
1706 error_with_decl (x, "`%s' used prior to declaration");
1711 file = DECL_SOURCE_FILE (t);
1712 line = DECL_SOURCE_LINE (t);
1715 if (t != 0 && duplicate_decls (x, t))
1717 if (TREE_CODE (t) == PARM_DECL)
1719 /* Don't allow more than one "real" duplicate
1720 of a forward parm decl. */
1721 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1724 /* If this decl is `static' and an implicit decl was seen previously,
1725 warn. But don't complain if -traditional,
1726 since traditional compilers don't complain. */
1727 if (!flag_traditional && TREE_PUBLIC (name)
1728 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1729 /* We used to warn also for explicit extern followed by static,
1730 but sometimes you need to do it that way. */
1731 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1733 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1734 IDENTIFIER_POINTER (name));
1735 pedwarn_with_file_and_line (file, line,
1736 "previous declaration of `%s'",
1737 IDENTIFIER_POINTER (name));
1743 /* If we are processing a typedef statement, generate a whole new
1744 ..._TYPE node (which will be just an variant of the existing
1745 ..._TYPE node with identical properties) and then install the
1746 TYPE_DECL node generated to represent the typedef name as the
1747 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1749 The whole point here is to end up with a situation where each
1750 and every ..._TYPE node the compiler creates will be uniquely
1751 associated with AT MOST one node representing a typedef name.
1752 This way, even though the compiler substitutes corresponding
1753 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1754 early on, later parts of the compiler can always do the reverse
1755 translation and get back the corresponding typedef name. For
1758 typedef struct S MY_TYPE;
1761 Later parts of the compiler might only know that `object' was of
1762 type `struct S' if if were not for code just below. With this
1763 code however, later parts of the compiler see something like:
1765 struct S' == struct S
1766 typedef struct S' MY_TYPE;
1769 And they can then deduce (from the node for type struct S') that
1770 the original object declaration was:
1774 Being able to do this is important for proper support of protoize,
1775 and also for generating precise symbolic debugging information
1776 which takes full account of the programmer's (typedef) vocabulary.
1778 Obviously, we don't want to generate a duplicate ..._TYPE node if
1779 the TYPE_DECL node that we are now processing really represents a
1780 standard built-in type.
1782 Since all standard types are effectively declared at line zero
1783 in the source file, we can easily check to see if we are working
1784 on a standard type by checking the current value of lineno. */
1786 if (TREE_CODE (x) == TYPE_DECL)
1788 if (DECL_SOURCE_LINE (x) == 0)
1790 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1791 TYPE_NAME (TREE_TYPE (x)) = x;
1795 tree tt = TREE_TYPE (x);
1797 tt = build_type_copy (tt);
1803 /* Multiple external decls of the same identifier ought to match.
1804 Check against both global declarations and out of scope (limbo) block
1807 We get warnings about inline functions where they are defined.
1808 Avoid duplicate warnings where they are used. */
1809 if ((DECL_EXTERNAL (x) || TREE_PUBLIC (x)) && ! DECL_INLINE (x))
1813 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1814 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1815 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1816 decl = IDENTIFIER_GLOBAL_VALUE (name);
1817 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1818 /* Decls in limbo are always extern, so no need to check that. */
1819 decl = IDENTIFIER_LIMBO_VALUE (name);
1823 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1824 /* If old decl is built-in, we already warned if we should. */
1825 && !DECL_BUILT_IN (decl))
1827 pedwarn_with_decl (x,
1828 "type mismatch with previous external decl");
1829 pedwarn_with_decl (decl, "previous external decl of `%s'");
1833 /* If a function has had an implicit declaration, and then is defined,
1834 make sure they are compatible. */
1836 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1837 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1838 && TREE_CODE (x) == FUNCTION_DECL
1839 && ! comptypes (TREE_TYPE (x),
1840 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1842 warning_with_decl (x, "type mismatch with previous implicit declaration");
1843 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1844 "previous implicit declaration of `%s'");
1847 /* In PCC-compatibility mode, extern decls of vars with no current decl
1848 take effect at top level no matter where they are. */
1849 if (flag_traditional && DECL_EXTERNAL (x)
1850 && lookup_name (name) == 0)
1852 tree type = TREE_TYPE (x);
1854 /* But don't do this if the type contains temporary nodes. */
1857 if (type == error_mark_node)
1859 if (! TREE_PERMANENT (type))
1861 warning_with_decl (x, "type of external `%s' is not global");
1862 /* By exiting the loop early, we leave TYPE nonzero,
1863 and thus prevent globalization of the decl. */
1866 else if (TREE_CODE (type) == FUNCTION_TYPE
1867 && TYPE_ARG_TYPES (type) != 0)
1868 /* The types might not be truly local,
1869 but the list of arg types certainly is temporary.
1870 Since prototypes are nontraditional,
1871 ok not to do the traditional thing. */
1873 type = TREE_TYPE (type);
1877 b = global_binding_level;
1880 /* This name is new in its binding level.
1881 Install the new declaration and return it. */
1882 if (b == global_binding_level)
1884 /* Install a global value. */
1886 /* If the first global decl has external linkage,
1887 warn if we later see static one. */
1888 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1889 TREE_PUBLIC (name) = 1;
1891 IDENTIFIER_GLOBAL_VALUE (name) = x;
1893 /* We no longer care about any previous block level declarations. */
1894 IDENTIFIER_LIMBO_VALUE (name) = 0;
1896 /* Don't forget if the function was used via an implicit decl. */
1897 if (IDENTIFIER_IMPLICIT_DECL (name)
1898 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1899 TREE_USED (x) = 1, TREE_USED (name) = 1;
1901 /* Don't forget if its address was taken in that way. */
1902 if (IDENTIFIER_IMPLICIT_DECL (name)
1903 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1904 TREE_ADDRESSABLE (x) = 1;
1906 /* Warn about mismatches against previous implicit decl. */
1907 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1908 /* If this real decl matches the implicit, don't complain. */
1909 && ! (TREE_CODE (x) == FUNCTION_DECL
1910 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1911 == integer_type_node)))
1912 pedwarn ("`%s' was previously implicitly declared to return `int'",
1913 IDENTIFIER_POINTER (name));
1915 /* If this decl is `static' and an `extern' was seen previously,
1916 that is erroneous. */
1917 if (TREE_PUBLIC (name)
1918 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1920 /* Okay to redeclare an ANSI built-in as static. */
1921 if (t != 0 && DECL_BUILT_IN (t))
1923 /* Okay to declare a non-ANSI built-in as anything. */
1924 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1926 else if (IDENTIFIER_IMPLICIT_DECL (name))
1927 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1928 IDENTIFIER_POINTER (name));
1930 pedwarn ("`%s' was declared `extern' and later `static'",
1931 IDENTIFIER_POINTER (name));
1936 /* Here to install a non-global value. */
1937 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
1938 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
1939 IDENTIFIER_LOCAL_VALUE (name) = x;
1941 /* If this is an extern function declaration, see if we
1942 have a global definition or declaration for the function. */
1944 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
1946 && TREE_CODE (x) == FUNCTION_DECL
1947 && TREE_CODE (oldglobal) == FUNCTION_DECL)
1949 /* We have one. Their types must agree. */
1950 if (! comptypes (TREE_TYPE (x),
1951 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
1952 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
1955 /* Inner extern decl is inline if global one is.
1956 Copy enough to really inline it. */
1957 if (DECL_INLINE (oldglobal))
1959 DECL_INLINE (x) = DECL_INLINE (oldglobal);
1960 DECL_INITIAL (x) = (current_function_decl == oldglobal
1961 ? 0 : DECL_INITIAL (oldglobal));
1962 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
1963 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
1964 DECL_RESULT (x) = DECL_RESULT (oldglobal);
1965 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
1966 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
1968 /* Inner extern decl is built-in if global one is. */
1969 if (DECL_BUILT_IN (oldglobal))
1971 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
1972 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
1974 /* Keep the arg types from a file-scope fcn defn. */
1975 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
1976 && DECL_INITIAL (oldglobal)
1977 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
1978 TREE_TYPE (x) = TREE_TYPE (oldglobal);
1982 #if 0 /* This case is probably sometimes the right thing to do. */
1983 /* If we have a local external declaration,
1984 then any file-scope declaration should not
1985 have been static. */
1986 if (oldlocal == 0 && oldglobal != 0
1987 && !TREE_PUBLIC (oldglobal)
1988 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1989 warning ("`%s' locally external but globally static",
1990 IDENTIFIER_POINTER (name));
1993 /* If we have a local external declaration,
1994 and no file-scope declaration has yet been seen,
1995 then if we later have a file-scope decl it must not be static. */
1998 && DECL_EXTERNAL (x)
2001 TREE_PUBLIC (name) = 1;
2003 /* Save this decl, so that we can do type checking against
2004 other decls after it falls out of scope.
2006 Only save it once. This prevents temporary decls created in
2007 expand_inline_function from being used here, since this
2008 will have been set when the inline function was parsed.
2009 It also helps give slightly better warnings. */
2010 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2011 IDENTIFIER_LIMBO_VALUE (name) = x;
2014 /* Warn if shadowing an argument at the top level of the body. */
2015 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2016 /* This warning doesn't apply to the parms of a nested fcn. */
2017 && ! current_binding_level->parm_flag
2018 /* Check that this is one level down from the parms. */
2019 && current_binding_level->level_chain->parm_flag
2020 /* Check that the decl being shadowed
2021 comes from the parm level, one level up. */
2022 && chain_member (oldlocal, current_binding_level->level_chain->names))
2024 if (TREE_CODE (oldlocal) == PARM_DECL)
2025 pedwarn ("declaration of `%s' shadows a parameter",
2026 IDENTIFIER_POINTER (name));
2028 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2029 IDENTIFIER_POINTER (name));
2032 /* Maybe warn if shadowing something else. */
2033 else if (warn_shadow && !DECL_EXTERNAL (x)
2034 /* No shadow warnings for internally generated vars. */
2035 && DECL_SOURCE_LINE (x) != 0
2036 /* No shadow warnings for vars made for inlining. */
2037 && ! DECL_FROM_INLINE (x))
2039 char *warnstring = 0;
2041 if (TREE_CODE (x) == PARM_DECL
2042 && current_binding_level->parm_flag == 1)
2043 /* Don't warn about the parm names in a declaration. */
2045 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2046 warnstring = "declaration of `%s' shadows a parameter";
2047 else if (oldlocal != 0)
2048 warnstring = "declaration of `%s' shadows previous local";
2049 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2050 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2051 warnstring = "declaration of `%s' shadows global declaration";
2054 warning (warnstring, IDENTIFIER_POINTER (name));
2057 /* If storing a local value, there may already be one (inherited).
2058 If so, record it for restoration when this binding level ends. */
2060 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2063 /* Keep count of variables in this level with incomplete type. */
2064 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2068 /* Put decls on list in reverse order.
2069 We will reverse them later if necessary. */
2070 TREE_CHAIN (x) = b->names;
2076 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2079 pushdecl_top_level (x)
2083 register struct binding_level *b = current_binding_level;
2085 current_binding_level = global_binding_level;
2087 current_binding_level = b;
2091 /* Generate an implicit declaration for identifier FUNCTIONID
2092 as a function of type int (). Print a warning if appropriate. */
2095 implicitly_declare (functionid)
2099 int traditional_warning = 0;
2100 /* Only one "implicit declaration" warning per identifier. */
2101 int implicit_warning;
2103 /* Save the decl permanently so we can warn if definition follows. */
2104 push_obstacks_nochange ();
2105 end_temporary_allocation ();
2107 /* We used to reuse an old implicit decl here,
2108 but this loses with inline functions because it can clobber
2109 the saved decl chains. */
2110 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2111 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2113 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2115 /* Warn of implicit decl following explicit local extern decl.
2116 This is probably a program designed for traditional C. */
2117 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2118 traditional_warning = 1;
2120 /* Warn once of an implicit declaration. */
2121 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2123 DECL_EXTERNAL (decl) = 1;
2124 TREE_PUBLIC (decl) = 1;
2126 /* Record that we have an implicit decl and this is it. */
2127 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2129 /* ANSI standard says implicit declarations are in the innermost block.
2130 So we record the decl in the standard fashion.
2131 If flag_traditional is set, pushdecl does it top-level. */
2134 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2135 maybe_objc_check_decl (decl);
2137 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2139 if (warn_implicit && implicit_warning)
2140 warning ("implicit declaration of function `%s'",
2141 IDENTIFIER_POINTER (functionid));
2142 else if (warn_traditional && traditional_warning)
2143 warning ("function `%s' was previously declared within a block",
2144 IDENTIFIER_POINTER (functionid));
2146 /* Write a record describing this implicit function declaration to the
2147 prototypes file (if requested). */
2149 gen_aux_info_record (decl, 0, 1, 0);
2156 /* Return zero if the declaration NEWDECL is valid
2157 when the declaration OLDDECL (assumed to be for the same name)
2158 has already been seen.
2159 Otherwise return an error message format string with a %s
2160 where the identifier should go. */
2163 redeclaration_error_message (newdecl, olddecl)
2164 tree newdecl, olddecl;
2166 if (TREE_CODE (newdecl) == TYPE_DECL)
2168 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2170 return "redefinition of `%s'";
2172 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2174 /* Declarations of functions can insist on internal linkage
2175 but they can't be inconsistent with internal linkage,
2176 so there can be no error on that account.
2177 However defining the same name twice is no good. */
2178 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2179 /* However, defining once as extern inline and a second
2180 time in another way is ok. */
2181 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2182 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2183 return "redefinition of `%s'";
2186 else if (current_binding_level == global_binding_level)
2188 /* Objects declared at top level: */
2189 /* If at least one is a reference, it's ok. */
2190 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2192 /* Reject two definitions. */
2193 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2194 return "redefinition of `%s'";
2195 /* Now we have two tentative defs, or one tentative and one real def. */
2196 /* Insist that the linkage match. */
2197 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2198 return "conflicting declarations of `%s'";
2201 else if (current_binding_level->parm_flag
2202 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2206 /* Objects declared with block scope: */
2207 /* Reject two definitions, and reject a definition
2208 together with an external reference. */
2209 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2210 return "redeclaration of `%s'";
2215 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2216 Create one if none exists so far for the current function.
2217 This function is called for both label definitions and label references. */
2223 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2225 /* Use a label already defined or ref'd with this name. */
2228 /* But not if it is inherited and wasn't declared to be inheritable. */
2229 if (DECL_CONTEXT (decl) != current_function_decl
2230 && ! C_DECLARED_LABEL_FLAG (decl))
2231 return shadow_label (id);
2235 decl = build_decl (LABEL_DECL, id, void_type_node);
2237 /* Make sure every label has an rtx. */
2240 /* A label not explicitly declared must be local to where it's ref'd. */
2241 DECL_CONTEXT (decl) = current_function_decl;
2243 DECL_MODE (decl) = VOIDmode;
2245 /* Say where one reference is to the label,
2246 for the sake of the error if it is not defined. */
2247 DECL_SOURCE_LINE (decl) = lineno;
2248 DECL_SOURCE_FILE (decl) = input_filename;
2250 IDENTIFIER_LABEL_VALUE (id) = decl;
2252 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2257 /* Make a label named NAME in the current function,
2258 shadowing silently any that may be inherited from containing functions
2259 or containing scopes.
2261 Note that valid use, if the label being shadowed
2262 comes from another scope in the same function,
2263 requires calling declare_nonlocal_label right away. */
2269 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2273 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2274 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2277 return lookup_label (name);
2280 /* Define a label, specifying the location in the source file.
2281 Return the LABEL_DECL node for the label, if the definition is valid.
2282 Otherwise return 0. */
2285 define_label (filename, line, name)
2290 tree decl = lookup_label (name);
2292 /* If label with this name is known from an outer context, shadow it. */
2293 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2295 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2296 IDENTIFIER_LABEL_VALUE (name) = 0;
2297 decl = lookup_label (name);
2300 if (DECL_INITIAL (decl) != 0)
2302 error_with_decl (decl, "duplicate label `%s'");
2307 /* Mark label as having been defined. */
2308 DECL_INITIAL (decl) = error_mark_node;
2309 /* Say where in the source. */
2310 DECL_SOURCE_FILE (decl) = filename;
2311 DECL_SOURCE_LINE (decl) = line;
2316 /* Return the list of declarations of the current level.
2317 Note that this list is in reverse order unless/until
2318 you nreverse it; and when you do nreverse it, you must
2319 store the result back using `storedecls' or you will lose. */
2324 return current_binding_level->names;
2327 /* Return the list of type-tags (for structs, etc) of the current level. */
2332 return current_binding_level->tags;
2335 /* Store the list of declarations of the current level.
2336 This is done for the parameter declarations of a function being defined,
2337 after they are modified in the light of any missing parameters. */
2343 current_binding_level->names = decls;
2346 /* Similarly, store the list of tags of the current level. */
2352 current_binding_level->tags = tags;
2355 /* Given NAME, an IDENTIFIER_NODE,
2356 return the structure (or union or enum) definition for that name.
2357 Searches binding levels from BINDING_LEVEL up to the global level.
2358 If THISLEVEL_ONLY is nonzero, searches only the specified context
2359 (but skips any tag-transparent contexts to find one that is
2360 meaningful for tags).
2361 CODE says which kind of type the caller wants;
2362 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2363 If the wrong kind of type is found, an error is reported. */
2366 lookup_tag (code, name, binding_level, thislevel_only)
2367 enum tree_code code;
2368 struct binding_level *binding_level;
2372 register struct binding_level *level;
2374 for (level = binding_level; level; level = level->level_chain)
2377 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2379 if (TREE_PURPOSE (tail) == name)
2381 if (TREE_CODE (TREE_VALUE (tail)) != code)
2383 /* Definition isn't the kind we were looking for. */
2384 pending_invalid_xref = name;
2385 pending_invalid_xref_file = input_filename;
2386 pending_invalid_xref_line = lineno;
2388 return TREE_VALUE (tail);
2391 if (thislevel_only && ! level->tag_transparent)
2397 /* Print an error message now
2398 for a recent invalid struct, union or enum cross reference.
2399 We don't print them immediately because they are not invalid
2400 when used in the `struct foo;' construct for shadowing. */
2403 pending_xref_error ()
2405 if (pending_invalid_xref != 0)
2406 error_with_file_and_line (pending_invalid_xref_file,
2407 pending_invalid_xref_line,
2408 "`%s' defined as wrong kind of tag",
2409 IDENTIFIER_POINTER (pending_invalid_xref));
2410 pending_invalid_xref = 0;
2413 /* Given a type, find the tag that was defined for it and return the tag name.
2414 Otherwise return 0. */
2417 lookup_tag_reverse (type)
2420 register struct binding_level *level;
2422 for (level = current_binding_level; level; level = level->level_chain)
2425 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2427 if (TREE_VALUE (tail) == type)
2428 return TREE_PURPOSE (tail);
2434 /* Look up NAME in the current binding level and its superiors
2435 in the namespace of variables, functions and typedefs.
2436 Return a ..._DECL node of some kind representing its definition,
2437 or return 0 if it is undefined. */
2444 if (current_binding_level != global_binding_level
2445 && IDENTIFIER_LOCAL_VALUE (name))
2446 val = IDENTIFIER_LOCAL_VALUE (name);
2448 val = IDENTIFIER_GLOBAL_VALUE (name);
2452 /* Similar to `lookup_name' but look only at current binding level. */
2455 lookup_name_current_level (name)
2460 if (current_binding_level == global_binding_level)
2461 return IDENTIFIER_GLOBAL_VALUE (name);
2463 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2466 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2467 if (DECL_NAME (t) == name)
2473 /* Create the predefined scalar types of C,
2474 and some nodes representing standard constants (0, 1, (void *)0).
2475 Initialize the global binding level.
2476 Make definitions for built-in primitive functions. */
2479 init_decl_processing ()
2481 register tree endlink;
2482 /* Either char* or void*. */
2483 tree traditional_ptr_type_node;
2484 /* Data types of memcpy and strlen. */
2485 tree memcpy_ftype, strlen_ftype;
2486 tree void_ftype_any;
2487 int wchar_type_size;
2490 current_function_decl = NULL;
2491 named_labels = NULL;
2492 current_binding_level = NULL_BINDING_LEVEL;
2493 free_binding_level = NULL_BINDING_LEVEL;
2494 pushlevel (0); /* make the binding_level structure for global names */
2495 global_binding_level = current_binding_level;
2497 /* Define `int' and `char' first so that dbx will output them first. */
2499 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2500 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2501 integer_type_node));
2503 /* Define `char', which is like either `signed char' or `unsigned char'
2504 but not the same as either. */
2508 ? make_signed_type (CHAR_TYPE_SIZE)
2509 : make_unsigned_type (CHAR_TYPE_SIZE));
2510 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2513 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2514 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2515 long_integer_type_node));
2517 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2518 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2519 unsigned_type_node));
2521 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2522 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2523 long_unsigned_type_node));
2525 /* `unsigned long' is the standard type for sizeof.
2526 Traditionally, use a signed type.
2527 Note that stddef.h uses `unsigned long',
2528 and this must agree, even of long and int are the same size. */
2529 if (flag_traditional)
2530 sizetype = long_integer_type_node;
2533 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2536 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2538 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2539 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2540 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2541 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2542 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2544 error_mark_node = make_node (ERROR_MARK);
2545 TREE_TYPE (error_mark_node) = error_mark_node;
2547 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2548 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2549 short_integer_type_node));
2551 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2552 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2553 long_long_integer_type_node));
2555 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2556 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2557 short_unsigned_type_node));
2559 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2560 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2561 long_long_unsigned_type_node));
2563 /* Define both `signed char' and `unsigned char'. */
2564 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2565 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2566 signed_char_type_node));
2568 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2569 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2570 unsigned_char_type_node));
2572 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2573 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2575 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2576 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2578 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2579 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2581 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2582 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2584 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2585 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2587 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2588 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2590 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2591 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2593 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2594 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2596 float_type_node = make_node (REAL_TYPE);
2597 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2598 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2600 layout_type (float_type_node);
2602 double_type_node = make_node (REAL_TYPE);
2603 if (flag_short_double)
2604 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2606 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2607 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2609 layout_type (double_type_node);
2611 long_double_type_node = make_node (REAL_TYPE);
2612 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2613 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2614 long_double_type_node));
2615 layout_type (long_double_type_node);
2618 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2619 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2620 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2621 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2623 integer_zero_node = build_int_2 (0, 0);
2624 TREE_TYPE (integer_zero_node) = integer_type_node;
2625 integer_one_node = build_int_2 (1, 0);
2626 TREE_TYPE (integer_one_node) = integer_type_node;
2628 size_zero_node = build_int_2 (0, 0);
2629 TREE_TYPE (size_zero_node) = sizetype;
2630 size_one_node = build_int_2 (1, 0);
2631 TREE_TYPE (size_one_node) = sizetype;
2633 void_type_node = make_node (VOID_TYPE);
2634 pushdecl (build_decl (TYPE_DECL,
2635 ridpointers[(int) RID_VOID], void_type_node));
2636 layout_type (void_type_node); /* Uses integer_zero_node */
2637 /* We are not going to have real types in C with less than byte alignment,
2638 so we might as well not have any types that claim to have it. */
2639 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2641 null_pointer_node = build_int_2 (0, 0);
2642 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2643 layout_type (TREE_TYPE (null_pointer_node));
2645 string_type_node = build_pointer_type (char_type_node);
2646 const_string_type_node
2647 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2649 /* make a type for arrays of 256 characters.
2650 256 is picked randomly because we have a type for integers from 0 to 255.
2651 With luck nothing will ever really depend on the length of this
2653 char_array_type_node
2654 = build_array_type (char_type_node, unsigned_intQI_type_node);
2655 /* Likewise for arrays of ints. */
2657 = build_array_type (integer_type_node, unsigned_intQI_type_node);
2658 /* This is for wide string constants. */
2659 wchar_array_type_node
2660 = build_array_type (wchar_type_node, unsigned_intQI_type_node);
2662 default_function_type
2663 = build_function_type (integer_type_node, NULL_TREE);
2665 ptr_type_node = build_pointer_type (void_type_node);
2667 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2669 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2672 = build_function_type (void_type_node, NULL_TREE);
2675 = build_function_type (double_type_node,
2676 tree_cons (NULL_TREE, double_type_node, endlink));
2678 double_ftype_double_double
2679 = build_function_type (double_type_node,
2680 tree_cons (NULL_TREE, double_type_node,
2681 tree_cons (NULL_TREE,
2682 double_type_node, endlink)));
2685 = build_function_type (integer_type_node,
2686 tree_cons (NULL_TREE, integer_type_node, endlink));
2689 = build_function_type (long_integer_type_node,
2690 tree_cons (NULL_TREE,
2691 long_integer_type_node, endlink));
2693 void_ftype_ptr_ptr_int
2694 = build_function_type (void_type_node,
2695 tree_cons (NULL_TREE, ptr_type_node,
2696 tree_cons (NULL_TREE, ptr_type_node,
2697 tree_cons (NULL_TREE,
2701 int_ftype_cptr_cptr_sizet
2702 = build_function_type (integer_type_node,
2703 tree_cons (NULL_TREE, const_ptr_type_node,
2704 tree_cons (NULL_TREE, const_ptr_type_node,
2705 tree_cons (NULL_TREE,
2709 void_ftype_ptr_int_int
2710 = build_function_type (void_type_node,
2711 tree_cons (NULL_TREE, ptr_type_node,
2712 tree_cons (NULL_TREE, integer_type_node,
2713 tree_cons (NULL_TREE,
2717 string_ftype_ptr_ptr /* strcpy prototype */
2718 = build_function_type (string_type_node,
2719 tree_cons (NULL_TREE, string_type_node,
2720 tree_cons (NULL_TREE,
2721 const_string_type_node,
2724 int_ftype_string_string /* strcmp prototype */
2725 = build_function_type (integer_type_node,
2726 tree_cons (NULL_TREE, const_string_type_node,
2727 tree_cons (NULL_TREE,
2728 const_string_type_node,
2731 strlen_ftype /* strlen prototype */
2732 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2733 tree_cons (NULL_TREE, const_string_type_node,
2736 traditional_ptr_type_node
2737 = (flag_traditional ? string_type_node : ptr_type_node);
2739 memcpy_ftype /* memcpy prototype */
2740 = build_function_type (traditional_ptr_type_node,
2741 tree_cons (NULL_TREE, ptr_type_node,
2742 tree_cons (NULL_TREE, const_ptr_type_node,
2743 tree_cons (NULL_TREE,
2747 /* ``integer_tpe_node'' misspelling corrected: North-Keys 30 Mar 91 */
2748 builtin_function ("__builtin_constant_p", int_ftype_int,
2749 BUILT_IN_CONSTANT_P, NULL_PTR);
2751 builtin_function ("__builtin_return_address",
2752 build_function_type (ptr_type_node,
2753 tree_cons (NULL_TREE,
2756 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2758 builtin_function ("__builtin_frame_address",
2759 build_function_type (ptr_type_node,
2760 tree_cons (NULL_TREE,
2763 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2765 builtin_function ("__builtin_alloca",
2766 build_function_type (ptr_type_node,
2767 tree_cons (NULL_TREE,
2770 BUILT_IN_ALLOCA, "alloca");
2771 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2773 temp = builtin_function ("alloca",
2774 build_function_type (ptr_type_node,
2775 tree_cons (NULL_TREE,
2778 BUILT_IN_ALLOCA, NULL_PTR);
2779 /* Suppress error if redefined as a non-function. */
2780 DECL_BUILT_IN_NONANSI (temp) = 1;
2781 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2783 TREE_THIS_VOLATILE (temp) = 1;
2784 TREE_SIDE_EFFECTS (temp) = 1;
2785 /* Suppress error if redefined as a non-function. */
2786 DECL_BUILT_IN_NONANSI (temp) = 1;
2789 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2790 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2792 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2794 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2795 builtin_function ("__builtin_saveregs",
2796 build_function_type (ptr_type_node, NULL_TREE),
2797 BUILT_IN_SAVEREGS, NULL_PTR);
2798 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2800 builtin_function ("__builtin_varargs",
2801 build_function_type (ptr_type_node,
2802 tree_cons (NULL_TREE,
2805 BUILT_IN_VARARGS, NULL_PTR);
2807 builtin_function ("__builtin_classify_type", default_function_type,
2808 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2809 builtin_function ("__builtin_next_arg",
2810 build_function_type (ptr_type_node, endlink),
2811 BUILT_IN_NEXT_ARG, NULL_PTR);
2812 builtin_function ("__builtin_args_info",
2813 build_function_type (integer_type_node,
2814 tree_cons (NULL_TREE,
2817 BUILT_IN_ARGS_INFO, NULL_PTR);
2819 /* Currently under experimentation. */
2820 builtin_function ("__builtin_memcpy", memcpy_ftype,
2821 BUILT_IN_MEMCPY, "memcpy");
2822 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2823 BUILT_IN_MEMCMP, "memcmp");
2824 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2825 BUILT_IN_STRCMP, "strcmp");
2826 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2827 BUILT_IN_STRCPY, "strcpy");
2828 builtin_function ("__builtin_strlen", strlen_ftype,
2829 BUILT_IN_STRLEN, "strlen");
2830 builtin_function ("__builtin_fsqrt", double_ftype_double,
2831 BUILT_IN_FSQRT, "sqrt");
2832 builtin_function ("__builtin_sin", double_ftype_double,
2833 BUILT_IN_SIN, "sin");
2834 builtin_function ("__builtin_cos", double_ftype_double,
2835 BUILT_IN_COS, "cos");
2837 /* In an ANSI C program, it is okay to supply built-in meanings
2838 for these functions, since applications cannot validly use them
2839 with any other meaning.
2840 However, honor the -fno-builtin option. */
2841 if (!flag_no_builtin)
2843 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2844 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
2845 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
2846 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
2847 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
2849 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
2851 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
2853 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
2854 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
2855 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
2856 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
2858 /* Declare these functions volatile
2859 to avoid spurious "control drops through" warnings. */
2860 /* Don't specify the argument types, to avoid errors
2861 from certain code which isn't valid in ANSI but which exists. */
2862 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
2864 TREE_THIS_VOLATILE (temp) = 1;
2865 TREE_SIDE_EFFECTS (temp) = 1;
2866 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
2867 TREE_THIS_VOLATILE (temp) = 1;
2868 TREE_SIDE_EFFECTS (temp) = 1;
2872 /* Support for these has not been written in either expand_builtin
2873 or build_function_call. */
2874 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
2875 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
2876 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
2878 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
2880 builtin_function ("__builtin_fmod", double_ftype_double_double,
2881 BUILT_IN_FMOD, NULL_PTR);
2882 builtin_function ("__builtin_frem", double_ftype_double_double,
2883 BUILT_IN_FREM, NULL_PTR);
2884 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
2885 BUILT_IN_MEMSET, NULL_PTR);
2886 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
2888 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
2892 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
2893 declare_function_name ();
2895 start_identifier_warnings ();
2897 init_format_info_table ();
2900 /* Return a definition for a builtin function named NAME and whose data type
2901 is TYPE. TYPE should be a function type with argument types.
2902 FUNCTION_CODE tells later passes how to compile calls to this function.
2903 See tree.h for its possible values.
2905 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2906 the name to be called if we can't opencode the function. */
2909 builtin_function (name, type, function_code, library_name)
2912 enum built_in_function function_code;
2915 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
2916 DECL_EXTERNAL (decl) = 1;
2917 TREE_PUBLIC (decl) = 1;
2918 /* If -traditional, permit redefining a builtin function any way you like.
2919 (Though really, if the program redefines these functions,
2920 it probably won't work right unless compiled with -fno-builtin.) */
2921 if (flag_traditional && name[0] != '_')
2922 DECL_BUILT_IN_NONANSI (decl) = 1;
2924 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
2925 make_decl_rtl (decl, NULL_PTR, 1);
2927 if (function_code != NOT_BUILT_IN)
2929 DECL_BUILT_IN (decl) = 1;
2930 DECL_SET_FUNCTION_CODE (decl, function_code);
2932 /* Warn if a function in the namespace for users
2933 is used without an occasion to consider it declared. */
2934 if (name[0] != '_' || name[1] != '_')
2935 C_DECL_ANTICIPATED (decl) = 1;
2940 /* Called when a declaration is seen that contains no names to declare.
2941 If its type is a reference to a structure, union or enum inherited
2942 from a containing scope, shadow that tag name for the current scope
2943 with a forward reference.
2944 If its type defines a new named structure or union
2945 or defines an enum, it is valid but we need not do anything here.
2946 Otherwise, it is an error. */
2949 shadow_tag (declspecs)
2952 shadow_tag_warned (declspecs, 0);
2956 shadow_tag_warned (declspecs, warned)
2963 pending_invalid_xref = 0;
2965 for (link = declspecs; link; link = TREE_CHAIN (link))
2967 register tree value = TREE_VALUE (link);
2968 register enum tree_code code = TREE_CODE (value);
2970 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
2971 /* Used to test also that TYPE_SIZE (value) != 0.
2972 That caused warning for `struct foo;' at top level in the file. */
2974 register tree name = lookup_tag_reverse (value);
2981 if (!warned && code != ENUMERAL_TYPE) /* Empty unnamed enum OK */
2983 pedwarn ("unnamed struct/union that defines no instances");
2989 t = lookup_tag (code, name, current_binding_level, 1);
2993 t = make_node (code);
3001 pedwarn ("useless keyword or type name in empty declaration");
3009 error ("two types specified in one empty declaration");
3011 pedwarn ("empty declaration");
3015 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3018 groktypename (typename)
3021 if (TREE_CODE (typename) != TREE_LIST)
3023 return grokdeclarator (TREE_VALUE (typename),
3024 TREE_PURPOSE (typename),
3028 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3031 groktypename_in_parm_context (typename)
3034 if (TREE_CODE (typename) != TREE_LIST)
3036 return grokdeclarator (TREE_VALUE (typename),
3037 TREE_PURPOSE (typename),
3041 /* Decode a declarator in an ordinary declaration or data definition.
3042 This is called as soon as the type information and variable name
3043 have been parsed, before parsing the initializer if any.
3044 Here we create the ..._DECL node, fill in its type,
3045 and put it on the list of decls for the current context.
3046 The ..._DECL node is returned as the value.
3048 Exception: for arrays where the length is not specified,
3049 the type is left null, to be filled in by `finish_decl'.
3051 Function definitions do not come here; they go to start_function
3052 instead. However, external and forward declarations of functions
3053 do go through here. Structure field declarations are done by
3054 grokfield and not through here. */
3056 /* Set this to zero to debug not using the temporary obstack
3057 to parse initializers. */
3058 int debug_temp_inits = 1;
3061 start_decl (declarator, declspecs, initialized)
3062 tree declarator, declspecs;
3065 register tree decl = grokdeclarator (declarator, declspecs,
3066 NORMAL, initialized);
3068 int init_written = initialized;
3070 /* The corresponding pop_obstacks is in finish_decl. */
3071 push_obstacks_nochange ();
3074 /* Is it valid for this decl to have an initializer at all?
3075 If not, set INITIALIZED to zero, which will indirectly
3076 tell `finish_decl' to ignore the initializer once it is parsed. */
3077 switch (TREE_CODE (decl))
3080 /* typedef foo = bar means give foo the same type as bar.
3081 We haven't parsed bar yet, so `finish_decl' will fix that up.
3082 Any other case of an initialization in a TYPE_DECL is an error. */
3083 if (pedantic || list_length (declspecs) > 1)
3085 error ("typedef `%s' is initialized",
3086 IDENTIFIER_POINTER (DECL_NAME (decl)));
3092 error ("function `%s' is initialized like a variable",
3093 IDENTIFIER_POINTER (DECL_NAME (decl)));
3098 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3099 error ("parameter `%s' is initialized",
3100 IDENTIFIER_POINTER (DECL_NAME (decl)));
3105 /* Don't allow initializations for incomplete types
3106 except for arrays which might be completed by the initialization. */
3107 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3109 /* A complete type is ok if size is fixed. */
3111 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3112 || C_DECL_VARIABLE_SIZE (decl))
3114 error ("variable-sized object may not be initialized");
3118 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3120 error ("variable `%s' has initializer but incomplete type",
3121 IDENTIFIER_POINTER (DECL_NAME (decl)));
3124 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3126 error ("elements of array `%s' have incomplete type",
3127 IDENTIFIER_POINTER (DECL_NAME (decl)));
3134 #if 0 /* Seems redundant with grokdeclarator. */
3135 if (current_binding_level != global_binding_level
3136 && DECL_EXTERNAL (decl)
3137 && TREE_CODE (decl) != FUNCTION_DECL)
3138 warning ("declaration of `%s' has `extern' and is initialized",
3139 IDENTIFIER_POINTER (DECL_NAME (decl)));
3141 DECL_EXTERNAL (decl) = 0;
3142 if (current_binding_level == global_binding_level)
3143 TREE_STATIC (decl) = 1;
3145 /* Tell `pushdecl' this is an initialized decl
3146 even though we don't yet have the initializer expression.
3147 Also tell `finish_decl' it may store the real initializer. */
3148 DECL_INITIAL (decl) = error_mark_node;
3151 /* If this is a function declaration, write a record describing it to the
3152 prototypes file (if requested). */
3154 if (TREE_CODE (decl) == FUNCTION_DECL)
3155 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3157 /* Add this decl to the current binding level.
3158 TEM may equal DECL or it may be a previous decl of the same name. */
3159 tem = pushdecl (decl);
3161 /* For a local variable, define the RTL now. */
3162 if (current_binding_level != global_binding_level
3163 /* But not if this is a duplicate decl
3164 and we preserved the rtl from the previous one
3165 (which may or may not happen). */
3166 && DECL_RTL (tem) == 0)
3168 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3170 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3171 && DECL_INITIAL (tem) != 0)
3177 /* When parsing and digesting the initializer,
3178 use temporary storage. Do this even if we will ignore the value. */
3179 if (current_binding_level == global_binding_level && debug_temp_inits)
3180 temporary_allocation ();
3186 /* Finish processing of a declaration;
3187 install its initial value.
3188 If the length of an array type is not known before,
3189 it must be determined now, from the initial value, or it is an error. */
3192 finish_decl (decl, init, asmspec_tree)
3196 register tree type = TREE_TYPE (decl);
3197 int was_incomplete = (DECL_SIZE (decl) == 0);
3198 int temporary = allocation_temporary_p ();
3202 asmspec = TREE_STRING_POINTER (asmspec_tree);
3204 /* If `start_decl' didn't like having an initialization, ignore it now. */
3206 if (init != 0 && DECL_INITIAL (decl) == 0)
3208 /* Don't crash if parm is initialized. */
3209 if (TREE_CODE (decl) == PARM_DECL)
3214 if (TREE_CODE (decl) != TYPE_DECL)
3215 store_init_value (decl, init);
3218 /* typedef foo = bar; store the type of bar as the type of foo. */
3219 TREE_TYPE (decl) = TREE_TYPE (init);
3220 DECL_INITIAL (decl) = init = 0;
3224 /* Pop back to the obstack that is current for this binding level.
3225 This is because MAXINDEX, rtl, etc. to be made below
3226 must go in the permanent obstack. But don't discard the
3227 temporary data yet. */
3229 #if 0 /* pop_obstacks was near the end; this is what was here. */
3230 if (current_binding_level == global_binding_level && temporary)
3231 end_temporary_allocation ();
3234 /* Deduce size of array from initialization, if not already known */
3236 if (TREE_CODE (type) == ARRAY_TYPE
3237 && TYPE_DOMAIN (type) == 0
3238 && TREE_CODE (decl) != TYPE_DECL)
3241 = (TREE_STATIC (decl)
3242 /* Even if pedantic, an external linkage array
3243 may have incomplete type at first. */
3244 ? pedantic && !TREE_PUBLIC (decl)
3245 : !DECL_EXTERNAL (decl));
3247 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3249 /* Get the completed type made by complete_array_type. */
3250 type = TREE_TYPE (decl);
3253 error_with_decl (decl, "initializer fails to determine size of `%s'");
3258 error_with_decl (decl, "array size missing in `%s'");
3259 else if (!pedantic && TREE_STATIC (decl))
3260 DECL_EXTERNAL (decl) = 1;
3263 if (pedantic && TYPE_DOMAIN (type) != 0
3264 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3266 error_with_decl (decl, "zero-size array `%s'");
3268 layout_decl (decl, 0);
3271 if (TREE_CODE (decl) == VAR_DECL)
3273 if (DECL_SIZE (decl) == 0
3274 && (TREE_STATIC (decl)
3276 /* A static variable with an incomplete type
3277 is an error if it is initialized or `static'.
3278 Otherwise, let it through, but if it is not `extern'
3279 then it may cause an error message later. */
3280 !TREE_PUBLIC (decl) || DECL_INITIAL (decl)
3282 /* An automatic variable with an incomplete type
3284 !DECL_EXTERNAL (decl)))
3286 error_with_decl (decl, "storage size of `%s' isn't known");
3287 TREE_TYPE (decl) = error_mark_node;
3290 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3291 && DECL_SIZE (decl) != 0
3292 && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
3293 error_with_decl (decl, "storage size of `%s' isn't constant");
3296 /* Output the assembler code and/or RTL code for variables and functions,
3297 unless the type is an undefined structure or union.
3298 If not, it will get done when the type is completed. */
3300 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3302 if (flag_traditional && allocation_temporary_p ())
3304 push_obstacks_nochange ();
3305 end_temporary_allocation ();
3306 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3307 maybe_objc_check_decl (decl);
3308 rest_of_decl_compilation (decl, asmspec,
3309 current_binding_level == global_binding_level,
3315 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3316 maybe_objc_check_decl (decl);
3317 rest_of_decl_compilation (decl, asmspec,
3318 current_binding_level == global_binding_level,
3321 if (current_binding_level != global_binding_level)
3323 /* Recompute the RTL of a local array now
3324 if it used to be an incomplete type. */
3326 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3328 /* If we used it already as memory, it must stay in memory. */
3329 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3330 /* If it's still incomplete now, no init will save it. */
3331 if (DECL_SIZE (decl) == 0)
3332 DECL_INITIAL (decl) = 0;
3335 /* Compute and store the initial value. */
3336 if (TREE_CODE (decl) != FUNCTION_DECL)
3337 expand_decl_init (decl);
3341 if (TREE_CODE (decl) == TYPE_DECL)
3343 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3344 maybe_objc_check_decl (decl);
3345 rest_of_decl_compilation (decl, NULL_PTR,
3346 current_binding_level == global_binding_level,
3350 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3351 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3352 && temporary && TREE_PERMANENT (decl))
3354 /* We need to remember that this array HAD an initialization,
3355 but discard the actual temporary nodes,
3356 since we can't have a permanent node keep pointing to them. */
3357 /* We make an exception for inline functions, since it's
3358 normal for a local extern redeclaration of an inline function
3359 to have a copy of the top-level decl's DECL_INLINE. */
3360 if (DECL_INITIAL (decl) != 0)
3361 DECL_INITIAL (decl) = error_mark_node;
3365 /* Resume permanent allocation, if not within a function. */
3366 /* The corresponding push_obstacks_nochange is in start_decl,
3367 and in push_parm_decl and in grokfield. */
3371 /* If we have gone back from temporary to permanent allocation,
3372 actually free the temporary space that we no longer need. */
3373 if (temporary && !allocation_temporary_p ())
3374 permanent_allocation ();
3376 /* At the end of a declaration, throw away any variable type sizes
3377 of types defined inside that declaration. There is no use
3378 computing them in the following function definition. */
3379 if (current_binding_level == global_binding_level)
3380 get_pending_sizes ();
3383 /* If DECL has a cleanup, build and return that cleanup here.
3384 This is a callback called by expand_expr. */
3387 maybe_build_cleanup (decl)
3390 /* There are no cleanups in C. */
3394 /* Given a parsed parameter declaration,
3395 decode it into a PARM_DECL and push that on the current binding level.
3396 Also, for the sake of forward parm decls,
3397 record the given order of parms in `parm_order'. */
3400 push_parm_decl (parm)
3404 int old_immediate_size_expand = immediate_size_expand;
3405 /* Don't try computing parm sizes now -- wait till fn is called. */
3406 immediate_size_expand = 0;
3408 /* The corresponding pop_obstacks is in finish_decl. */
3409 push_obstacks_nochange ();
3411 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3412 if (DECL_NAME (decl))
3414 olddecl = lookup_name (DECL_NAME (decl));
3415 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3416 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3418 decl = pushdecl (decl);
3420 immediate_size_expand = old_immediate_size_expand;
3422 current_binding_level->parm_order
3423 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3425 /* Add this decl to the current binding level. */
3426 finish_decl (decl, NULL_TREE, NULL_TREE);
3429 /* Clear the given order of parms in `parm_order'.
3430 Used at start of parm list,
3431 and also at semicolon terminating forward decls. */
3436 current_binding_level->parm_order = NULL_TREE;
3439 /* Make TYPE a complete type based on INITIAL_VALUE.
3440 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3441 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3444 complete_array_type (type, initial_value, do_default)
3449 register tree maxindex = NULL_TREE;
3454 /* Note MAXINDEX is really the maximum index,
3455 one less than the size. */
3456 if (TREE_CODE (initial_value) == STRING_CST)
3459 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3460 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3462 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3465 = list_length (CONSTRUCTOR_ELTS (initial_value));
3466 maxindex = build_int_2 (nelts - 1, 0);
3470 /* Make an error message unless that happened already. */
3471 if (initial_value != error_mark_node)
3474 /* Prevent further error messages. */
3475 maxindex = build_int_2 (1, 0);
3482 maxindex = build_int_2 (1, 0);
3488 TYPE_DOMAIN (type) = build_index_type (maxindex);
3489 if (!TREE_TYPE (maxindex))
3490 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3493 /* Lay out the type now that we can get the real answer. */
3500 /* Given declspecs and a declarator,
3501 determine the name and type of the object declared
3502 and construct a ..._DECL node for it.
3503 (In one case we can return a ..._TYPE node instead.
3504 For invalid input we sometimes return 0.)
3506 DECLSPECS is a chain of tree_list nodes whose value fields
3507 are the storage classes and type specifiers.
3509 DECL_CONTEXT says which syntactic context this declaration is in:
3510 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3511 FUNCDEF for a function definition. Like NORMAL but a few different
3512 error messages in each case. Return value may be zero meaning
3513 this definition is too screwy to try to parse.
3514 PARM for a parameter declaration (either within a function prototype
3515 or before a function body). Make a PARM_DECL, or return void_type_node.
3516 TYPENAME if for a typename (in a cast or sizeof).
3517 Don't make a DECL node; just return the ..._TYPE node.
3518 FIELD for a struct or union field; make a FIELD_DECL.
3519 BITFIELD for a field with specified width.
3520 INITIALIZED is 1 if the decl has an initializer.
3522 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3523 It may also be so in the PARM case, for a prototype where the
3524 argument type is specified but not the name.
3526 This function is where the complicated C meanings of `static'
3527 and `extern' are interpreted. */
3530 grokdeclarator (declarator, declspecs, decl_context, initialized)
3533 enum decl_context decl_context;
3538 tree type = NULL_TREE;
3543 int explicit_int = 0;
3544 int explicit_char = 0;
3545 tree typedef_decl = 0;
3547 tree typedef_type = 0;
3548 int funcdef_flag = 0;
3549 enum tree_code innermost_code = ERROR_MARK;
3551 int size_varies = 0;
3553 if (decl_context == BITFIELD)
3554 bitfield = 1, decl_context = FIELD;
3556 if (decl_context == FUNCDEF)
3557 funcdef_flag = 1, decl_context = NORMAL;
3559 push_obstacks_nochange ();
3561 if (flag_traditional && allocation_temporary_p ())
3562 end_temporary_allocation ();
3564 /* Look inside a declarator for the name being declared
3565 and get it as a string, for an error message. */
3567 register tree decl = declarator;
3571 switch (TREE_CODE (decl))
3576 innermost_code = TREE_CODE (decl);
3577 decl = TREE_OPERAND (decl, 0);
3580 case IDENTIFIER_NODE:
3581 name = IDENTIFIER_POINTER (decl);
3592 /* A function definition's declarator must have the form of
3593 a function declarator. */
3595 if (funcdef_flag && innermost_code != CALL_EXPR)
3598 /* Anything declared one level down from the top level
3599 must be one of the parameters of a function
3600 (because the body is at least two levels down). */
3602 /* If this looks like a function definition, make it one,
3603 even if it occurs where parms are expected.
3604 Then store_parm_decls will reject it and not use it as a parm. */
3605 if (decl_context == NORMAL && !funcdef_flag
3606 && current_binding_level->level_chain == global_binding_level)
3607 decl_context = PARM;
3609 /* Look through the decl specs and record which ones appear.
3610 Some typespecs are defined as built-in typenames.
3611 Others, the ones that are modifiers of other types,
3612 are represented by bits in SPECBITS: set the bits for
3613 the modifiers that appear. Storage class keywords are also in SPECBITS.
3615 If there is a typedef name or a type, store the type in TYPE.
3616 This includes builtin typedefs such as `int'.
3618 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3619 and did not come from a user typedef.
3621 Set LONGLONG if `long' is mentioned twice. */
3623 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3626 register tree id = TREE_VALUE (spec);
3628 if (id == ridpointers[(int) RID_INT])
3630 if (id == ridpointers[(int) RID_CHAR])
3633 if (TREE_CODE (id) == IDENTIFIER_NODE)
3634 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3636 if (ridpointers[i] == id)
3638 if (i == (int) RID_LONG && specbits & (1<<i))
3641 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3643 error ("`long long long' is too long for GCC");
3647 else if (specbits & (1 << i))
3648 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3654 error ("two or more data types in declaration of `%s'", name);
3655 /* Actual typedefs come to us as TYPE_DECL nodes. */
3656 else if (TREE_CODE (id) == TYPE_DECL)
3658 type = TREE_TYPE (id);
3661 /* Built-in types come as identifiers. */
3662 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3664 register tree t = lookup_name (id);
3665 if (TREE_TYPE (t) == error_mark_node)
3667 else if (!t || TREE_CODE (t) != TYPE_DECL)
3668 error ("`%s' fails to be a typedef or built in type",
3669 IDENTIFIER_POINTER (id));
3672 type = TREE_TYPE (t);
3676 else if (TREE_CODE (id) != ERROR_MARK)
3682 typedef_type = type;
3684 size_varies = C_TYPE_VARIABLE_SIZE (type);
3686 /* No type at all: default to `int', and set EXPLICIT_INT
3687 because it was not a user-defined typedef. */
3691 if (funcdef_flag && warn_return_type
3692 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3693 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3694 warn_about_return_type = 1;
3696 type = integer_type_node;
3699 /* Now process the modifiers that were specified
3700 and check for invalid combinations. */
3702 /* Long double is a special combination. */
3704 if ((specbits & 1 << (int) RID_LONG)
3705 && TYPE_MAIN_VARIANT (type) == double_type_node)
3707 specbits &= ~ (1 << (int) RID_LONG);
3708 type = long_double_type_node;
3711 /* Check all other uses of type modifiers. */
3713 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3714 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3718 if (TREE_CODE (type) != INTEGER_TYPE)
3719 error ("long, short, signed or unsigned invalid for `%s'", name);
3720 else if ((specbits & 1 << (int) RID_LONG)
3721 && (specbits & 1 << (int) RID_SHORT))
3722 error ("long and short specified together for `%s'", name);
3723 else if (((specbits & 1 << (int) RID_LONG)
3724 || (specbits & 1 << (int) RID_SHORT))
3726 error ("long or short specified with char for `%s'", name);
3727 else if (((specbits & 1 << (int) RID_LONG)
3728 || (specbits & 1 << (int) RID_SHORT))
3729 && TREE_CODE (type) == REAL_TYPE)
3730 error ("long or short specified with floating type for `%s'", name);
3731 else if ((specbits & 1 << (int) RID_SIGNED)
3732 && (specbits & 1 << (int) RID_UNSIGNED))
3733 error ("signed and unsigned given together for `%s'", name);
3737 if (!explicit_int && !explicit_char && pedantic)
3739 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3741 if (flag_pedantic_errors)
3746 /* Discard the type modifiers if they are invalid. */
3749 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3750 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3755 /* Decide whether an integer type is signed or not.
3756 Optionally treat bitfields as signed by default. */
3757 if (specbits & 1 << (int) RID_UNSIGNED
3758 /* Traditionally, all bitfields are unsigned. */
3759 || (bitfield && flag_traditional
3760 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3761 || (bitfield && ! flag_signed_bitfields
3762 && (explicit_int || explicit_char
3763 /* A typedef for plain `int' without `signed'
3764 can be controlled just like plain `int'. */
3765 || ! (typedef_decl != 0
3766 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3767 && TREE_CODE (type) != ENUMERAL_TYPE
3768 && !(specbits & 1 << (int) RID_SIGNED)))
3771 type = long_long_unsigned_type_node;
3772 else if (specbits & 1 << (int) RID_LONG)
3773 type = long_unsigned_type_node;
3774 else if (specbits & 1 << (int) RID_SHORT)
3775 type = short_unsigned_type_node;
3776 else if (type == char_type_node)
3777 type = unsigned_char_type_node;
3778 else if (typedef_decl)
3779 type = unsigned_type (type);
3781 type = unsigned_type_node;
3783 else if ((specbits & 1 << (int) RID_SIGNED)
3784 && type == char_type_node)
3785 type = signed_char_type_node;
3787 type = long_long_integer_type_node;
3788 else if (specbits & 1 << (int) RID_LONG)
3789 type = long_integer_type_node;
3790 else if (specbits & 1 << (int) RID_SHORT)
3791 type = short_integer_type_node;
3793 /* Set CONSTP if this declaration is `const', whether by
3794 explicit specification or via a typedef.
3795 Likewise for VOLATILEP. */
3797 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3798 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3799 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3801 pedwarn ("duplicate `const'");
3803 pedwarn ("duplicate `volatile'");
3804 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
3805 type = TYPE_MAIN_VARIANT (type);
3807 /* Warn if two storage classes are given. Default to `auto'. */
3812 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3813 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3814 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3815 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3816 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3818 /* Warn about storage classes that are invalid for certain
3819 kinds of declarations (parameters, typenames, etc.). */
3822 error ("multiple storage classes in declaration of `%s'", name);
3823 else if (funcdef_flag
3825 & ((1 << (int) RID_REGISTER)
3826 | (1 << (int) RID_AUTO)
3827 | (1 << (int) RID_TYPEDEF))))
3829 if (specbits & 1 << (int) RID_AUTO
3830 && (pedantic || current_binding_level == global_binding_level))
3831 pedwarn ("function definition declared `auto'");
3832 if (specbits & 1 << (int) RID_REGISTER)
3833 error ("function definition declared `register'");
3834 if (specbits & 1 << (int) RID_TYPEDEF)
3835 error ("function definition declared `typedef'");
3836 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3837 | (1 << (int) RID_AUTO));
3839 else if (decl_context != NORMAL && nclasses > 0)
3841 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3845 error ((decl_context == FIELD
3846 ? "storage class specified for structure field `%s'"
3847 : (decl_context == PARM
3848 ? "storage class specified for parameter `%s'"
3849 : "storage class specified for typename")),
3851 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3852 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3853 | (1 << (int) RID_EXTERN));
3856 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3858 /* `extern' with initialization is invalid if not at top level. */
3859 if (current_binding_level == global_binding_level)
3860 warning ("`%s' initialized and declared `extern'", name);
3862 error ("`%s' has both `extern' and initializer", name);
3864 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
3865 && current_binding_level != global_binding_level)
3866 error ("nested function `%s' declared `extern'", name);
3867 else if (current_binding_level == global_binding_level
3868 && specbits & (1 << (int) RID_AUTO))
3869 error ("top-level declaration of `%s' specifies `auto'", name);
3872 /* Now figure out the structure of the declarator proper.
3873 Descend through it, creating more complex types, until we reach
3874 the declared identifier (or NULL_TREE, in an absolute declarator). */
3876 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
3878 if (type == error_mark_node)
3880 declarator = TREE_OPERAND (declarator, 0);
3884 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3885 an INDIRECT_REF (for *...),
3886 a CALL_EXPR (for ...(...)),
3887 an identifier (for the name being declared)
3888 or a null pointer (for the place in an absolute declarator
3889 where the name was omitted).
3890 For the last two cases, we have just exited the loop.
3892 At this point, TYPE is the type of elements of an array,
3893 or for a function to return, or for a pointer to point to.
3894 After this sequence of ifs, TYPE is the type of the
3895 array or function or pointer, and DECLARATOR has had its
3896 outermost layer removed. */
3898 if (TREE_CODE (declarator) == ARRAY_REF)
3900 register tree itype = NULL_TREE;
3901 register tree size = TREE_OPERAND (declarator, 1);
3903 declarator = TREE_OPERAND (declarator, 0);
3905 /* Check for some types that there cannot be arrays of. */
3907 if (TYPE_MAIN_VARIANT (type) == void_type_node)
3909 error ("declaration of `%s' as array of voids", name);
3910 type = error_mark_node;
3913 if (TREE_CODE (type) == FUNCTION_TYPE)
3915 error ("declaration of `%s' as array of functions", name);
3916 type = error_mark_node;
3919 if (size == error_mark_node)
3920 type = error_mark_node;
3922 if (type == error_mark_node)
3925 /* If size was specified, set ITYPE to a range-type for that size.
3926 Otherwise, ITYPE remains null. finish_decl may figure it out
3927 from an initial value. */
3931 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3932 STRIP_TYPE_NOPS (size);
3934 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
3935 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
3937 error ("size of array `%s' has non-integer type", name);
3938 size = integer_one_node;
3940 if (pedantic && integer_zerop (size))
3941 pedwarn ("ANSI C forbids zero-size array `%s'", name);
3942 if (TREE_CODE (size) == INTEGER_CST)
3944 if (INT_CST_LT (size, integer_zero_node))
3946 error ("size of array `%s' is negative", name);
3947 size = integer_one_node;
3949 itype = build_index_type (size_binop (MINUS_EXPR, size,
3955 pedwarn ("ANSI C forbids variable-size array `%s'", name);
3956 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
3958 /* Make sure the array size remains visibly nonconstant
3959 even if it is (eg) a const variable with known value. */
3961 itype = variable_size (itype);
3962 itype = build_index_type (itype);
3966 #if 0 /* This had bad results for pointers to arrays, as in
3967 union incomplete (*foo)[4]; */
3968 /* Complain about arrays of incomplete types, except in typedefs. */
3970 if (TYPE_SIZE (type) == 0
3971 /* Avoid multiple warnings for nested array types. */
3972 && TREE_CODE (type) != ARRAY_TYPE
3973 && !(specbits & (1 << (int) RID_TYPEDEF))
3974 && !C_TYPE_BEING_DEFINED (type))
3975 warning ("array type has incomplete element type");
3978 /* Build the array type itself.
3979 Merge any constancy or volatility into the target type. */
3981 #if 0 /* We shouldn't have a function type here at all!
3982 Functions aren't allowed as array elements. */
3983 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
3984 && (constp || volatilep))
3985 pedwarn ("ANSI C forbids const or volatile function types");
3987 if (constp || volatilep)
3988 type = c_build_type_variant (type, constp, volatilep);
3990 #if 0 /* don't clear these; leave them set so that the array type
3991 or the variable is itself const or volatile. */
3996 type = build_array_type (type, itype);
3998 C_TYPE_VARIABLE_SIZE (type) = 1;
4000 else if (TREE_CODE (declarator) == CALL_EXPR)
4002 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4003 || current_binding_level == global_binding_level);
4006 /* Declaring a function type.
4007 Make sure we have a valid type for the function to return. */
4008 if (type == error_mark_node)
4013 /* Warn about some types functions can't return. */
4015 if (TREE_CODE (type) == FUNCTION_TYPE)
4017 error ("`%s' declared as function returning a function", name);
4018 type = integer_type_node;
4020 if (TREE_CODE (type) == ARRAY_TYPE)
4022 error ("`%s' declared as function returning an array", name);
4023 type = integer_type_node;
4026 #ifndef TRADITIONAL_RETURN_FLOAT
4027 /* Traditionally, declaring return type float means double. */
4029 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4030 type = double_type_node;
4031 #endif /* TRADITIONAL_RETURN_FLOAT */
4033 /* If this is a block level extern, it must live past the end
4034 of the function so that we can check it against other extern
4035 declarations (IDENTIFIER_LIMBO_VALUE). */
4036 if (extern_ref && allocation_temporary_p ())
4037 end_temporary_allocation ();
4039 /* Construct the function type and go to the next
4040 inner layer of declarator. */
4042 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4044 /* Say it's a definition
4045 only for the CALL_EXPR
4046 closest to the identifier. */
4047 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4048 #if 0 /* This seems to be false. We turn off temporary allocation
4049 above in this function if -traditional.
4050 And this code caused inconsistent results with prototypes:
4051 callers would ignore them, and pass arguments wrong. */
4053 /* Omit the arg types if -traditional, since the arg types
4054 and the list links might not be permanent. */
4055 type = build_function_type (type,
4057 ? NULL_TREE : arg_types);
4059 type = build_function_type (type, arg_types);
4060 declarator = TREE_OPERAND (declarator, 0);
4062 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4063 the formal parameter list of this FUNCTION_TYPE to point to
4064 the FUNCTION_TYPE node itself. */
4069 for (link = current_function_parm_tags;
4071 link = TREE_CHAIN (link))
4072 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4075 else if (TREE_CODE (declarator) == INDIRECT_REF)
4077 /* Merge any constancy or volatility into the target type
4080 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4081 && (constp || volatilep))
4082 pedwarn ("ANSI C forbids const or volatile function types");
4083 if (constp || volatilep)
4084 type = c_build_type_variant (type, constp, volatilep);
4089 type = build_pointer_type (type);
4091 /* Process a list of type modifier keywords
4092 (such as const or volatile) that were given inside the `*'. */
4094 if (TREE_TYPE (declarator))
4096 register tree typemodlist;
4098 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4099 typemodlist = TREE_CHAIN (typemodlist))
4101 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4103 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4108 error ("invalid type modifier within pointer declarator");
4112 pedwarn ("duplicate `const'");
4114 pedwarn ("duplicate `volatile'");
4117 declarator = TREE_OPERAND (declarator, 0);
4124 /* Now TYPE has the actual type. */
4126 /* If this is declaring a typedef name, return a TYPE_DECL. */
4128 if (specbits & (1 << (int) RID_TYPEDEF))
4131 /* Note that the grammar rejects storage classes
4132 in typenames, fields or parameters */
4133 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4134 && (constp || volatilep))
4135 pedwarn ("ANSI C forbids const or volatile function types");
4136 if (constp || volatilep)
4137 type = c_build_type_variant (type, constp, volatilep);
4139 decl = build_decl (TYPE_DECL, declarator, type);
4140 if ((specbits & (1 << (int) RID_SIGNED))
4141 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4142 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4146 /* Detect the case of an array type of unspecified size
4147 which came, as such, direct from a typedef name.
4148 We must copy the type, so that each identifier gets
4149 a distinct type, so that each identifier's size can be
4150 controlled separately by its own initializer. */
4152 if (type != 0 && typedef_type != 0
4153 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4154 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4156 type = build_array_type (TREE_TYPE (type), 0);
4158 C_TYPE_VARIABLE_SIZE (type) = 1;
4161 /* If this is a type name (such as, in a cast or sizeof),
4162 compute the type and return it now. */
4164 if (decl_context == TYPENAME)
4166 /* Note that the grammar rejects storage classes
4167 in typenames, fields or parameters */
4168 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4169 && (constp || volatilep))
4170 pedwarn ("ANSI C forbids const or volatile function types");
4171 if (constp || volatilep)
4172 type = c_build_type_variant (type, constp, volatilep);
4177 /* `void' at top level (not within pointer)
4178 is allowed only in typedefs or type names.
4179 We don't complain about parms either, but that is because
4180 a better error message can be made later. */
4182 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM)
4184 error ("variable or field `%s' declared void",
4185 IDENTIFIER_POINTER (declarator));
4186 type = integer_type_node;
4189 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4190 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4195 if (decl_context == PARM)
4197 tree type_as_written = type;
4200 /* A parameter declared as an array of T is really a pointer to T.
4201 One declared as a function is really a pointer to a function. */
4203 if (TREE_CODE (type) == ARRAY_TYPE)
4205 /* Transfer const-ness of array into that of type pointed to. */
4206 type = build_pointer_type
4207 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4208 volatilep = constp = 0;
4211 else if (TREE_CODE (type) == FUNCTION_TYPE)
4213 if (pedantic && (constp || volatilep))
4214 pedwarn ("ANSI C forbids const or volatile function types");
4215 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4216 volatilep = constp = 0;
4219 decl = build_decl (PARM_DECL, declarator, type);
4221 C_DECL_VARIABLE_SIZE (decl) = 1;
4223 /* Compute the type actually passed in the parmlist,
4224 for the case where there is no prototype.
4225 (For example, shorts and chars are passed as ints.)
4226 When there is a prototype, this is overridden later. */
4228 DECL_ARG_TYPE (decl) = type;
4229 main_type = TYPE_MAIN_VARIANT (type);
4230 if (main_type == float_type_node)
4231 DECL_ARG_TYPE (decl) = double_type_node;
4232 /* Don't use TYPE_PRECISION to decide whether to promote,
4233 because we should convert short if it's the same size as int,
4234 but we should not convert long if it's the same size as int. */
4235 else if (C_PROMOTING_INTEGER_TYPE_P (main_type))
4237 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4238 && TREE_UNSIGNED (type))
4239 DECL_ARG_TYPE (decl) = unsigned_type_node;
4241 DECL_ARG_TYPE (decl) = integer_type_node;
4244 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4246 else if (decl_context == FIELD)
4248 /* Structure field. It may not be a function. */
4250 if (TREE_CODE (type) == FUNCTION_TYPE)
4252 error ("field `%s' declared as a function",
4253 IDENTIFIER_POINTER (declarator));
4254 type = build_pointer_type (type);
4256 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4258 error ("field `%s' has incomplete type",
4259 IDENTIFIER_POINTER (declarator));
4260 type = error_mark_node;
4262 /* Move type qualifiers down to element of an array. */
4263 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4265 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4267 TYPE_DOMAIN (type));
4268 #if 0 /* Leave the field const or volatile as well. */
4269 constp = volatilep = 0;
4272 decl = build_decl (FIELD_DECL, declarator, type);
4274 C_DECL_VARIABLE_SIZE (decl) = 1;
4276 else if (TREE_CODE (type) == FUNCTION_TYPE)
4278 /* Every function declaration is "external"
4279 except for those which are inside a function body
4280 in which `auto' is used.
4281 That is a case not specified by ANSI C,
4282 and we use it for forward declarations for nested functions. */
4283 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4284 || current_binding_level == global_binding_level);
4286 if (specbits & (1 << (int) RID_AUTO)
4287 && (pedantic || current_binding_level == global_binding_level))
4288 pedwarn ("invalid storage class for function `%s'",
4289 IDENTIFIER_POINTER (declarator));
4290 if (specbits & (1 << (int) RID_REGISTER))
4291 error ("invalid storage class for function `%s'",
4292 IDENTIFIER_POINTER (declarator));
4293 /* Function declaration not at top level.
4294 Storage classes other than `extern' are not allowed
4295 and `extern' makes no difference. */
4296 if (current_binding_level != global_binding_level
4297 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4299 pedwarn ("invalid storage class for function `%s'",
4300 IDENTIFIER_POINTER (declarator));
4302 /* If this is a block level extern, it must live past the end
4303 of the function so that we can check it against other
4304 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4305 if (extern_ref && allocation_temporary_p ())
4306 end_temporary_allocation ();
4308 decl = build_decl (FUNCTION_DECL, declarator, type);
4310 if (pedantic && (constp || volatilep)
4311 && ! DECL_IN_SYSTEM_HEADER (decl))
4312 pedwarn ("ANSI C forbids const or volatile functions");
4315 DECL_EXTERNAL (decl) = 1;
4316 /* Record absence of global scope for `static' or `auto'. */
4318 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4319 /* Record presence of `inline', if it is reasonable. */
4322 tree last = tree_last (TYPE_ARG_TYPES (type));
4324 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4325 warning ("cannot inline function `main'");
4326 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4328 warning ("inline declaration ignored for function with `...'");
4330 /* Assume that otherwise the function can be inlined. */
4331 DECL_INLINE (decl) = 1;
4333 if (specbits & (1 << (int) RID_EXTERN))
4334 current_extern_inline = 1;
4339 /* It's a variable. */
4340 /* An uninitialized decl with `extern' is a reference. */
4341 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4343 /* Move type qualifiers down to element of an array. */
4344 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4346 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4348 TYPE_DOMAIN (type));
4349 #if 0 /* Leave the variable const or volatile as well. */
4350 constp = volatilep = 0;
4354 /* If this is a block level extern, it must live past the end
4355 of the function so that we can check it against other
4356 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4357 if (extern_ref && allocation_temporary_p ())
4358 end_temporary_allocation ();
4360 decl = build_decl (VAR_DECL, declarator, type);
4362 C_DECL_VARIABLE_SIZE (decl) = 1;
4365 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4367 DECL_EXTERNAL (decl) = extern_ref;
4368 /* At top level, the presence of a `static' or `register' storage
4369 class specifier, or the absence of all storage class specifiers
4370 makes this declaration a definition (perhaps tentative). Also,
4371 the absence of both `static' and `register' makes it public. */
4372 if (current_binding_level == global_binding_level)
4376 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4377 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4379 /* Not at top level, only `static' makes a static definition. */
4382 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4383 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4387 /* Record `register' declaration for warnings on &
4388 and in case doing stupid register allocation. */
4390 if (specbits & (1 << (int) RID_REGISTER))
4391 DECL_REGISTER (decl) = 1;
4393 /* Record constancy and volatility. */
4396 TREE_READONLY (decl) = 1;
4399 TREE_SIDE_EFFECTS (decl) = 1;
4400 TREE_THIS_VOLATILE (decl) = 1;
4402 /* If a type has volatile components, it should be stored in memory.
4403 Otherwise, the fact that those components are volatile
4404 will be ignored, and would even crash the compiler. */
4405 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4406 mark_addressable (decl);
4414 /* Make a variant type in the proper way for C, propagating qualifiers
4415 down to the element type of an array. */
4418 c_build_type_variant (type, constp, volatilep)
4420 int constp, volatilep;
4422 if (TREE_CODE (type) == ARRAY_TYPE)
4423 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4425 TYPE_DOMAIN (type));
4426 return build_type_variant (type, constp, volatilep);
4429 /* Decode the parameter-list info for a function type or function definition.
4430 The argument is the value returned by `get_parm_info' (or made in parse.y
4431 if there is an identifier list instead of a parameter decl list).
4432 These two functions are separate because when a function returns
4433 or receives functions then each is called multiple times but the order
4434 of calls is different. The last call to `grokparms' is always the one
4435 that contains the formal parameter names of a function definition.
4437 Store in `last_function_parms' a chain of the decls of parms.
4438 Also store in `last_function_parm_tags' a chain of the struct, union,
4439 and enum tags declared among the parms.
4441 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4443 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4444 a mere declaration. A nonempty identifier-list gets an error message
4445 when FUNCDEF_FLAG is zero. */
4448 grokparms (parms_info, funcdef_flag)
4452 tree first_parm = TREE_CHAIN (parms_info);
4454 last_function_parms = TREE_PURPOSE (parms_info);
4455 last_function_parm_tags = TREE_VALUE (parms_info);
4457 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4458 && !in_system_header)
4459 warning ("function declaration isn't a prototype");
4462 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4465 pedwarn ("parameter names (without types) in function declaration");
4467 last_function_parms = first_parm;
4474 /* We no longer test FUNCDEF_FLAG.
4475 If the arg types are incomplete in a declaration,
4476 they must include undefined tags.
4477 These tags can never be defined in the scope of the declaration,
4478 so the types can never be completed,
4479 and no call can be compiled successfully. */
4481 /* In a fcn definition, arg types must be complete. */
4484 for (parm = last_function_parms, typelt = first_parm;
4486 parm = TREE_CHAIN (parm))
4487 /* Skip over any enumeration constants declared here. */
4488 if (TREE_CODE (parm) == PARM_DECL)
4490 /* Barf if the parameter itself has an incomplete type. */
4491 tree type = TREE_VALUE (typelt);
4492 if (TYPE_SIZE (type) == 0)
4494 if (funcdef_flag && DECL_NAME (parm) != 0)
4495 error ("parameter `%s' has incomplete type",
4496 IDENTIFIER_POINTER (DECL_NAME (parm)));
4498 warning ("parameter has incomplete type");
4501 TREE_VALUE (typelt) = error_mark_node;
4502 TREE_TYPE (parm) = error_mark_node;
4505 #if 0 /* This has been replaced by parm_tags_warning
4506 which uses a more accurate criterion for what to warn about. */
4509 /* Now warn if is a pointer to an incomplete type. */
4510 while (TREE_CODE (type) == POINTER_TYPE
4511 || TREE_CODE (type) == REFERENCE_TYPE)
4512 type = TREE_TYPE (type);
4513 type = TYPE_MAIN_VARIANT (type);
4514 if (TYPE_SIZE (type) == 0)
4516 if (DECL_NAME (parm) != 0)
4517 warning ("parameter `%s' points to incomplete type",
4518 IDENTIFIER_POINTER (DECL_NAME (parm)));
4520 warning ("parameter points to incomplete type");
4524 typelt = TREE_CHAIN (typelt);
4527 /* Allocate the list of types the way we allocate a type. */
4528 if (first_parm && ! TREE_PERMANENT (first_parm))
4530 /* Construct a copy of the list of types
4531 on the saveable obstack. */
4533 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4534 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4536 return nreverse (result);
4539 /* The list we have is permanent already. */
4545 /* Return a tree_list node with info on a parameter list just parsed.
4546 The TREE_PURPOSE is a chain of decls of those parms.
4547 The TREE_VALUE is a list of structure, union and enum tags defined.
4548 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4549 This tree_list node is later fed to `grokparms'.
4551 VOID_AT_END nonzero means append `void' to the end of the type-list.
4552 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4555 get_parm_info (void_at_end)
4558 register tree decl, t;
4559 register tree types = 0;
4561 tree tags = gettags ();
4562 tree parms = getdecls ();
4564 tree order = current_binding_level->parm_order;
4566 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4567 if (void_at_end && parms != 0
4568 && TREE_CHAIN (parms) == 0
4569 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4570 && DECL_NAME (parms) == 0)
4573 storedecls (NULL_TREE);
4574 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4575 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4578 /* Extract enumerator values and other non-parms declared with the parms.
4579 Likewise any forward parm decls that didn't have real parm decls. */
4580 for (decl = parms; decl; )
4582 tree next = TREE_CHAIN (decl);
4584 if (TREE_CODE (decl) != PARM_DECL)
4586 TREE_CHAIN (decl) = new_parms;
4589 else if (TREE_ASM_WRITTEN (decl))
4591 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4592 TREE_CHAIN (decl) = new_parms;
4598 /* Put the parm decls back in the order they were in in the parm list. */
4599 for (t = order; t; t = TREE_CHAIN (t))
4602 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4604 TREE_CHAIN (TREE_VALUE (t)) = 0;
4607 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4610 /* Store the parmlist in the binding level since the old one
4611 is no longer a valid list. (We have changed the chain pointers.) */
4612 storedecls (new_parms);
4614 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4615 /* There may also be declarations for enumerators if an enumeration
4616 type is declared among the parms. Ignore them here. */
4617 if (TREE_CODE (decl) == PARM_DECL)
4619 /* Since there is a prototype,
4620 args are passed in their declared types. */
4621 tree type = TREE_TYPE (decl);
4622 DECL_ARG_TYPE (decl) = type;
4623 #ifdef PROMOTE_PROTOTYPES
4624 if (TREE_CODE (type) == INTEGER_TYPE
4625 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4626 DECL_ARG_TYPE (decl) = integer_type_node;
4629 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4630 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4631 && DECL_NAME (decl) == 0)
4633 error ("`void' in parameter list must be the entire list");
4639 return saveable_tree_cons (new_parms, tags,
4640 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4642 return saveable_tree_cons (new_parms, tags, nreverse (types));
4645 /* At end of parameter list, warn about any struct, union or enum tags
4646 defined within. Do so because these types cannot ever become complete. */
4649 parmlist_tags_warning ()
4654 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4656 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4657 /* An anonymous union parm type is meaningful as a GNU extension.
4658 So don't warn for that. */
4659 if (code == UNION_TYPE && !pedantic)
4661 if (TREE_PURPOSE (elt) != 0)
4662 warning ("`%s %s' declared inside parameter list",
4663 (code == RECORD_TYPE ? "struct"
4664 : code == UNION_TYPE ? "union"
4666 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4668 warning ("anonymous %s declared inside parameter list",
4669 (code == RECORD_TYPE ? "struct"
4670 : code == UNION_TYPE ? "union"
4675 warning ("its scope is only this definition or declaration,");
4676 warning ("which is probably not what you want.");
4682 /* Get the struct, enum or union (CODE says which) with tag NAME.
4683 Define the tag as a forward-reference if it is not defined. */
4686 xref_tag (code, name)
4687 enum tree_code code;
4690 int temporary = allocation_temporary_p ();
4692 /* If a cross reference is requested, look up the type
4693 already defined for this tag and return it. */
4695 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4696 /* Even if this is the wrong type of tag, return what we found.
4697 There will be an error message anyway, from pending_xref_error.
4698 If we create an empty xref just for an invalid use of the type,
4699 the main result is to create lots of superfluous error messages. */
4703 push_obstacks_nochange ();
4705 if (current_binding_level == global_binding_level && temporary)
4706 end_temporary_allocation ();
4708 /* If no such tag is yet defined, create a forward-reference node
4709 and record it as the "definition".
4710 When a real declaration of this type is found,
4711 the forward-reference will be altered into a real type. */
4713 ref = make_node (code);
4714 if (code == ENUMERAL_TYPE)
4716 /* (In ANSI, Enums can be referred to only if already defined.) */
4718 pedwarn ("ANSI C forbids forward references to `enum' types");
4719 /* Give the type a default layout like unsigned int
4720 to avoid crashing if it does not get defined. */
4721 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4722 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4723 TREE_UNSIGNED (ref) = 1;
4724 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4725 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4726 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4729 pushtag (name, ref);
4736 /* Make sure that the tag NAME is defined *in the current binding level*
4737 at least as a forward reference.
4738 CODE says which kind of tag NAME ought to be.
4740 We also do a push_obstacks_nochange
4741 whose matching pop is in finish_struct. */
4744 start_struct (code, name)
4745 enum tree_code code;
4748 /* If there is already a tag defined at this binding level
4749 (as a forward reference), just return it. */
4751 register tree ref = 0;
4753 push_obstacks_nochange ();
4754 if (current_binding_level == global_binding_level)
4755 end_temporary_allocation ();
4758 ref = lookup_tag (code, name, current_binding_level, 1);
4759 if (ref && TREE_CODE (ref) == code)
4761 C_TYPE_BEING_DEFINED (ref) = 1;
4762 if (TYPE_FIELDS (ref))
4763 error ((code == UNION_TYPE ? "redefinition of `union %s'"
4764 : "redefinition of `struct %s'"),
4765 IDENTIFIER_POINTER (name));
4770 /* Otherwise create a forward-reference just so the tag is in scope. */
4772 ref = make_node (code);
4773 pushtag (name, ref);
4774 C_TYPE_BEING_DEFINED (ref) = 1;
4778 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4779 of a structure component, returning a FIELD_DECL node.
4780 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4782 This is done during the parsing of the struct declaration.
4783 The FIELD_DECL nodes are chained together and the lot of them
4784 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4787 grokfield (filename, line, declarator, declspecs, width)
4790 tree declarator, declspecs, width;
4794 /* The corresponding pop_obstacks is in finish_decl. */
4795 push_obstacks_nochange ();
4797 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4799 finish_decl (value, NULL_TREE, NULL_TREE);
4800 DECL_INITIAL (value) = width;
4805 /* Function to help qsort sort FIELD_DECLs by name order. */
4808 field_decl_cmp (x, y)
4811 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
4814 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4815 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4817 We also do a pop_obstacks to match the push in start_struct. */
4820 finish_struct (t, fieldlist)
4821 register tree t, fieldlist;
4825 int toplevel = global_binding_level == current_binding_level;
4827 /* If this type was previously laid out as a forward reference,
4828 make sure we lay it out again. */
4832 /* Nameless union parm types are useful as GCC extension. */
4833 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4834 /* Otherwise, warn about any struct or union def. in parmlist. */
4835 if (in_parm_level_p ())
4838 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4839 : "structure defined inside parms"));
4841 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4842 : "structure defined inside parms"));
4845 old_momentary = suspend_momentary ();
4847 if (fieldlist == 0 && pedantic)
4848 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
4849 : "structure has no members"));
4851 /* Install struct as DECL_CONTEXT of each field decl.
4852 Also process specified field sizes.
4853 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
4854 The specified size is found in the DECL_INITIAL.
4855 Store 0 there, except for ": 0" fields (so we can find them
4856 and delete them, below). */
4858 for (x = fieldlist; x; x = TREE_CHAIN (x))
4860 DECL_CONTEXT (x) = t;
4861 DECL_FIELD_SIZE (x) = 0;
4863 /* If any field is const, the structure type is pseudo-const. */
4864 if (TREE_READONLY (x))
4865 C_TYPE_FIELDS_READONLY (t) = 1;
4868 /* A field that is pseudo-const makes the structure likewise. */
4869 tree t1 = TREE_TYPE (x);
4870 while (TREE_CODE (t1) == ARRAY_TYPE)
4871 t1 = TREE_TYPE (t1);
4872 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4873 && C_TYPE_FIELDS_READONLY (t1))
4874 C_TYPE_FIELDS_READONLY (t) = 1;
4877 /* Any field that is volatile means variables of this type must be
4878 treated in some ways as volatile. */
4879 if (TREE_THIS_VOLATILE (x))
4880 C_TYPE_FIELDS_VOLATILE (t) = 1;
4882 /* Any field of nominal variable size implies structure is too. */
4883 if (C_DECL_VARIABLE_SIZE (x))
4884 C_TYPE_VARIABLE_SIZE (t) = 1;
4886 /* Detect invalid nested redefinition. */
4887 if (TREE_TYPE (x) == t)
4888 error ("nested redefinition of `%s'",
4889 IDENTIFIER_POINTER (TYPE_NAME (t)));
4891 /* Detect invalid bit-field size. */
4892 if (DECL_INITIAL (x))
4893 STRIP_NOPS (DECL_INITIAL (x));
4894 if (DECL_INITIAL (x) && TREE_CODE (DECL_INITIAL (x)) != INTEGER_CST)
4896 error_with_decl (x, "bit-field `%s' width not an integer constant");
4897 DECL_INITIAL (x) = NULL;
4900 /* Detect invalid bit-field type. */
4901 if (DECL_INITIAL (x)
4902 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
4903 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
4905 error_with_decl (x, "bit-field `%s' has invalid type");
4906 DECL_INITIAL (x) = NULL;
4908 if (DECL_INITIAL (x) && pedantic
4909 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
4910 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node)
4911 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
4913 /* Detect and ignore out of range field width. */
4914 if (DECL_INITIAL (x))
4916 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4918 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
4920 DECL_INITIAL (x) = NULL;
4921 error_with_decl (x, "negative width in bit-field `%s'");
4923 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
4924 || width > TYPE_PRECISION (TREE_TYPE (x)))
4926 DECL_INITIAL (x) = NULL;
4927 pedwarn_with_decl (x, "width of `%s' exceeds its type");
4929 else if (width == 0 && DECL_NAME (x) != 0)
4931 error_with_decl (x, "zero width for bit-field `%s'");
4932 DECL_INITIAL (x) = NULL;
4936 /* Process valid field width. */
4937 if (DECL_INITIAL (x))
4939 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
4941 DECL_FIELD_SIZE (x) = width;
4942 DECL_BIT_FIELD (x) = 1;
4943 DECL_INITIAL (x) = NULL;
4947 /* field size 0 => force desired amount of alignment. */
4948 #ifdef EMPTY_FIELD_BOUNDARY
4949 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
4951 #ifdef PCC_BITFIELD_TYPE_MATTERS
4952 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
4953 TYPE_ALIGN (TREE_TYPE (x)));
4959 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
4960 : TYPE_ALIGN (TREE_TYPE (x)));
4961 /* Non-bit-fields are aligned for their type, except packed
4962 fields which require only BITS_PER_UNIT alignment. */
4963 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
4967 /* Now DECL_INITIAL is null on all members. */
4969 /* Delete all duplicate fields from the fieldlist */
4970 for (x = fieldlist; x && TREE_CHAIN (x);)
4971 /* Anonymous fields aren't duplicates. */
4972 if (DECL_NAME (TREE_CHAIN (x)) == 0)
4976 register tree y = fieldlist;
4980 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
4986 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
4988 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
4989 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
4991 else x = TREE_CHAIN (x);
4994 /* Now we have the nearly final fieldlist. Record it,
4995 then lay out the structure or union (including the fields). */
4997 TYPE_FIELDS (t) = fieldlist;
5001 /* Delete all zero-width bit-fields from the front of the fieldlist */
5003 && DECL_INITIAL (fieldlist))
5004 fieldlist = TREE_CHAIN (fieldlist);
5005 /* Delete all such members from the rest of the fieldlist */
5006 for (x = fieldlist; x;)
5008 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5009 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5010 else x = TREE_CHAIN (x);
5013 /* Now we have the truly final field list.
5014 Store it in this type and in the variants. */
5016 TYPE_FIELDS (t) = fieldlist;
5018 /* If there are lots of fields, sort so we can look through them fast.
5019 We arbitrarily consider 16 or more elts to be "a lot". */
5023 for (x = fieldlist; x; x = TREE_CHAIN (x))
5034 len += list_length (x);
5035 /* Use the same allocation policy here that make_node uses, to
5036 ensure that this lives as long as the rest of the struct decl.
5037 All decls in an inline function need to be saved. */
5038 if (allocation_temporary_p ())
5039 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5041 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5043 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5044 TYPE_LANG_SPECIFIC (t)->len = len;
5046 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5048 for (x = fieldlist; x; x = TREE_CHAIN (x))
5049 field_array[len++] = x;
5051 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5055 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5057 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5058 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5059 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5062 /* Promote each bit-field's type to int if it is narrower than that. */
5063 for (x = fieldlist; x; x = TREE_CHAIN (x))
5064 if (DECL_BIT_FIELD (x)
5065 && C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)))
5067 tree type = TREE_TYPE (x);
5069 /* Preserve unsignedness if traditional or if not really any wider. */
5070 if (TREE_UNSIGNED (type)
5071 && (flag_traditional
5072 || (TYPE_PRECISION (type)
5073 == TYPE_PRECISION (integer_type_node))))
5074 TREE_TYPE (x) = unsigned_type_node;
5076 TREE_TYPE (x) = integer_type_node;
5079 /* If this structure or union completes the type of any previous
5080 variable declaration, lay it out and output its rtl. */
5082 if (current_binding_level->n_incomplete != 0)
5085 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5087 if (TREE_TYPE (decl) == t
5088 && TREE_CODE (decl) != TYPE_DECL)
5090 layout_decl (decl, 0);
5091 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5092 maybe_objc_check_decl (decl);
5093 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5096 --current_binding_level->n_incomplete;
5098 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5099 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5101 tree element = TREE_TYPE (decl);
5102 while (TREE_CODE (element) == ARRAY_TYPE)
5103 element = TREE_TYPE (element);
5105 layout_array_type (TREE_TYPE (decl));
5110 resume_momentary (old_momentary);
5112 /* Finish debugging output for this type. */
5113 rest_of_type_compilation (t, toplevel);
5115 /* The matching push is in start_struct. */
5121 /* Lay out the type T, and its element type, and so on. */
5124 layout_array_type (t)
5127 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5128 layout_array_type (TREE_TYPE (t));
5132 /* Begin compiling the definition of an enumeration type.
5133 NAME is its name (or null if anonymous).
5134 Returns the type object, as yet incomplete.
5135 Also records info about it so that build_enumerator
5136 may be used to declare the individual values as they are read. */
5142 register tree enumtype = 0;
5144 /* If this is the real definition for a previous forward reference,
5145 fill in the contents in the same object that used to be the
5146 forward reference. */
5149 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5151 /* The corresponding pop_obstacks is in finish_enum. */
5152 push_obstacks_nochange ();
5153 /* If these symbols and types are global, make them permanent. */
5154 if (current_binding_level == global_binding_level)
5155 end_temporary_allocation ();
5157 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5159 enumtype = make_node (ENUMERAL_TYPE);
5160 pushtag (name, enumtype);
5163 C_TYPE_BEING_DEFINED (enumtype) = 1;
5165 if (TYPE_VALUES (enumtype) != 0)
5167 /* This enum is a named one that has been declared already. */
5168 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5170 /* Completely replace its old definition.
5171 The old enumerators remain defined, however. */
5172 TYPE_VALUES (enumtype) = 0;
5175 enum_next_value = integer_zero_node;
5181 /* After processing and defining all the values of an enumeration type,
5182 install their decls in the enumeration type and finish it off.
5183 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5184 Returns ENUMTYPE. */
5187 finish_enum (enumtype, values)
5188 register tree enumtype, values;
5191 tree minnode = 0, maxnode = 0;
5192 register HOST_WIDE_INT maxvalue = 0;
5193 register HOST_WIDE_INT minvalue = 0;
5195 unsigned precision = 0;
5196 int toplevel = global_binding_level == current_binding_level;
5197 int temporary = allocation_temporary_p ();
5199 if (in_parm_level_p ())
5200 warning ("enum defined inside parms");
5202 /* Calculate the maximum value of any enumerator in this type. */
5204 for (pair = values; pair; pair = TREE_CHAIN (pair))
5206 tree value = TREE_VALUE (pair);
5208 minnode = maxnode = TREE_VALUE (pair);
5211 if (tree_int_cst_lt (maxnode, value))
5213 if (tree_int_cst_lt (value, minnode))
5218 TYPE_MIN_VALUE (enumtype) = minnode;
5219 TYPE_MAX_VALUE (enumtype) = maxnode;
5221 /* Determine the precision this type needs. */
5223 if (TREE_INT_CST_HIGH (minnode) >= 0
5224 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5225 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5226 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5227 precision = TYPE_PRECISION (long_long_integer_type_node);
5230 maxvalue = TREE_INT_CST_LOW (maxnode);
5231 minvalue = TREE_INT_CST_LOW (minnode);
5234 precision = floor_log2 (maxvalue) + 1;
5237 /* Compute number of bits to represent magnitude of a negative value.
5238 Add one to MINVALUE since range of negative numbers
5239 includes the power of two. */
5240 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5241 if (negprecision > precision)
5242 precision = negprecision;
5243 precision += 1; /* room for sign bit */
5250 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5251 /* Use the width of the narrowest normal C type which is wide enough. */
5252 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5254 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5256 TYPE_SIZE (enumtype) = 0;
5257 layout_type (enumtype);
5259 /* An enum can have some negative values; then it is signed. */
5260 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5262 /* If the enumerators might not fit in an int, change their type now. */
5263 /* It seems more useful in the debugger to leave these as int
5264 unless the enumerator is wider than int. */
5265 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5266 for (pair = values; pair; pair = TREE_CHAIN (pair))
5268 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5269 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5270 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5271 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5274 /* Replace the decl nodes in VALUES with their names. */
5275 for (pair = values; pair; pair = TREE_CHAIN (pair))
5276 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5278 TYPE_VALUES (enumtype) = values;
5280 /* Finish debugging output for this type. */
5281 rest_of_type_compilation (enumtype, toplevel);
5283 /* This matches a push in start_enum. */
5289 /* Build and install a CONST_DECL for one value of the
5290 current enumeration type (one that was begun with start_enum).
5291 Return a tree-list containing the CONST_DECL and its value.
5292 Assignment of sequential values by default is handled here. */
5295 build_enumerator (name, value)
5300 /* Validate and default VALUE. */
5302 /* Remove no-op casts from the value. */
5304 STRIP_TYPE_NOPS (value);
5306 if (value != 0 && TREE_CODE (value) != INTEGER_CST)
5308 error ("enumerator value for `%s' not integer constant",
5309 IDENTIFIER_POINTER (name));
5313 /* Default based on previous value. */
5314 /* It should no longer be possible to have NON_LVALUE_EXPR
5318 value = enum_next_value;
5320 error ("overflow in enumeration values");
5323 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5325 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5326 value = integer_zero_node;
5329 /* Set basis for default for next value. */
5330 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5331 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5333 /* Now create a declaration for the enum value name. */
5335 decl = build_decl (CONST_DECL, name, integer_type_node);
5336 DECL_INITIAL (decl) = value;
5337 TREE_TYPE (value) = integer_type_node;
5340 return saveable_tree_cons (decl, value, NULL_TREE);
5343 /* Create the FUNCTION_DECL for a function definition.
5344 DECLSPECS and DECLARATOR are the parts of the declaration;
5345 they describe the function's name and the type it returns,
5346 but twisted together in a fashion that parallels the syntax of C.
5348 This function creates a binding context for the function body
5349 as well as setting up the FUNCTION_DECL in current_function_decl.
5351 Returns 1 on success. If the DECLARATOR is not suitable for a function
5352 (it defines a datum instead), we return 0, which tells
5353 yyparse to report a parse error.
5355 NESTED is nonzero for a function nested within another function. */
5358 start_function (declspecs, declarator, nested)
5359 tree declarator, declspecs;
5362 tree decl1, old_decl;
5365 current_function_returns_value = 0; /* Assume, until we see it does. */
5366 current_function_returns_null = 0;
5367 warn_about_return_type = 0;
5368 current_extern_inline = 0;
5369 c_function_varargs = 0;
5371 shadowed_labels = 0;
5373 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5375 /* If the declarator is not suitable for a function definition,
5376 cause a syntax error. */
5380 announce_function (decl1);
5382 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5384 error ("return-type is an incomplete type");
5385 /* Make it return void instead. */
5387 = build_function_type (void_type_node,
5388 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5391 if (warn_about_return_type)
5392 warning ("return-type defaults to `int'");
5394 /* Save the parm names or decls from this function's declarator
5395 where store_parm_decls will find them. */
5396 current_function_parms = last_function_parms;
5397 current_function_parm_tags = last_function_parm_tags;
5399 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5400 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5401 DECL_INITIAL (decl1) = error_mark_node;
5403 /* If this definition isn't a prototype and we had a prototype declaration
5404 before, copy the arg type info from that prototype.
5405 But not if what we had before was a builtin function. */
5406 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5407 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5408 && !DECL_BUILT_IN (old_decl)
5409 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5410 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5411 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5412 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5414 /* Optionally warn of old-fashioned def with no previous prototype. */
5415 if (warn_strict_prototypes
5416 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5417 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5418 warning ("function declaration isn't a prototype");
5419 /* Optionally warn of any global def with no previous prototype. */
5420 else if (warn_missing_prototypes
5421 && TREE_PUBLIC (decl1)
5422 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5423 warning_with_decl (decl1, "no previous prototype for `%s'");
5424 /* Optionally warn of any def with no previous prototype
5425 if the function has already been used. */
5426 else if (warn_missing_prototypes
5427 && old_decl != 0 && TREE_USED (old_decl)
5428 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5429 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5431 /* This is a definition, not a reference.
5432 So normally clear DECL_EXTERNAL.
5433 However, `extern inline' acts like a declaration
5434 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5435 DECL_EXTERNAL (decl1) = current_extern_inline;
5437 /* This function exists in static storage.
5438 (This does not mean `static' in the C sense!) */
5439 TREE_STATIC (decl1) = 1;
5441 /* A nested function is not global. */
5442 if (current_function_decl != 0)
5443 TREE_PUBLIC (decl1) = 0;
5445 /* Record the decl so that the function name is defined.
5446 If we already have a decl for this name, and it is a FUNCTION_DECL,
5447 use the old decl. */
5449 current_function_decl = pushdecl (decl1);
5452 declare_parm_level (1);
5453 current_binding_level->subblocks_tag_transparent = 1;
5455 make_function_rtl (current_function_decl);
5457 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5458 /* Promote the value to int before returning it. */
5459 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5461 /* It retains unsignedness if traditional
5462 or if not really getting wider. */
5463 if (TREE_UNSIGNED (restype)
5464 && (flag_traditional
5465 || (TYPE_PRECISION (restype)
5466 == TYPE_PRECISION (integer_type_node))))
5467 restype = unsigned_type_node;
5469 restype = integer_type_node;
5471 DECL_RESULT (current_function_decl)
5472 = build_decl (RESULT_DECL, NULL_TREE, restype);
5475 /* Allocate further tree nodes temporarily during compilation
5476 of this function only. */
5477 temporary_allocation ();
5479 /* If this fcn was already referenced via a block-scope `extern' decl
5480 (or an implicit decl), propagate certain information about the usage. */
5481 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5482 TREE_ADDRESSABLE (current_function_decl) = 1;
5487 /* Record that this function is going to be a varargs function.
5488 This is called before store_parm_decls, which is too early
5489 to call mark_varargs directly. */
5494 c_function_varargs = 1;
5497 /* Store the parameter declarations into the current function declaration.
5498 This is called after parsing the parameter declarations, before
5499 digesting the body of the function.
5501 For an old-style definition, modify the function's type
5502 to specify at least the number of arguments. */
5507 register tree fndecl = current_function_decl;
5510 /* This is either a chain of PARM_DECLs (if a prototype was used)
5511 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5512 tree specparms = current_function_parms;
5514 /* This is a list of types declared among parms in a prototype. */
5515 tree parmtags = current_function_parm_tags;
5517 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5518 register tree parmdecls = getdecls ();
5520 /* This is a chain of any other decls that came in among the parm
5521 declarations. If a parm is declared with enum {foo, bar} x;
5522 then CONST_DECLs for foo and bar are put here. */
5525 /* Nonzero if this definition is written with a prototype. */
5528 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5530 /* This case is when the function was defined with an ANSI prototype.
5531 The parms already have decls, so we need not do anything here
5532 except record them as in effect
5533 and complain if any redundant old-style parm decls were written. */
5544 error_with_decl (fndecl,
5545 "parm types given both in parmlist and separately");
5546 /* Get rid of the erroneous decls; don't keep them on
5547 the list of parms, since they might not be PARM_DECLs. */
5548 for (decl = current_binding_level->names;
5549 decl; decl = TREE_CHAIN (decl))
5550 if (DECL_NAME (decl))
5551 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5552 for (link = current_binding_level->shadowed;
5553 link; link = TREE_CHAIN (link))
5554 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5555 current_binding_level->names = 0;
5556 current_binding_level->shadowed = 0;
5559 specparms = nreverse (specparms);
5560 for (parm = specparms; parm; parm = next)
5562 next = TREE_CHAIN (parm);
5563 if (TREE_CODE (parm) == PARM_DECL)
5565 if (DECL_NAME (parm) == 0)
5566 error_with_decl (parm, "parameter name omitted");
5567 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5569 error_with_decl (parm, "parameter `%s' declared void");
5570 /* Change the type to error_mark_node so this parameter
5571 will be ignored by assign_parms. */
5572 TREE_TYPE (parm) = error_mark_node;
5578 /* If we find an enum constant or a type tag,
5579 put it aside for the moment. */
5580 TREE_CHAIN (parm) = 0;
5581 others = chainon (others, parm);
5585 /* Get the decls in their original chain order
5586 and record in the function. */
5587 DECL_ARGUMENTS (fndecl) = getdecls ();
5590 /* If this function takes a variable number of arguments,
5591 add a phony parameter to the end of the parm list,
5592 to represent the position of the first unnamed argument. */
5593 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5596 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5597 /* Let's hope the address of the unnamed parm
5598 won't depend on its type. */
5599 TREE_TYPE (dummy) = integer_type_node;
5600 DECL_ARG_TYPE (dummy) = integer_type_node;
5601 DECL_ARGUMENTS (fndecl)
5602 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5606 /* Now pushdecl the enum constants. */
5607 for (parm = others; parm; parm = next)
5609 next = TREE_CHAIN (parm);
5610 if (DECL_NAME (parm) == 0)
5612 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5614 else if (TREE_CODE (parm) != PARM_DECL)
5618 storetags (chainon (parmtags, gettags ()));
5622 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5623 each with a parm name as the TREE_VALUE.
5625 PARMDECLS is a chain of declarations for parameters.
5626 Warning! It can also contain CONST_DECLs which are not parameters
5627 but are names of enumerators of any enum types
5628 declared among the parameters.
5630 First match each formal parameter name with its declaration.
5631 Associate decls with the names and store the decls
5632 into the TREE_PURPOSE slots. */
5634 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5635 DECL_RESULT (parm) = 0;
5637 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5639 register tree tail, found = NULL;
5641 if (TREE_VALUE (parm) == 0)
5643 error_with_decl (fndecl, "parameter name missing from parameter list");
5644 TREE_PURPOSE (parm) = 0;
5648 /* See if any of the parmdecls specifies this parm by name.
5649 Ignore any enumerator decls. */
5650 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5651 if (DECL_NAME (tail) == TREE_VALUE (parm)
5652 && TREE_CODE (tail) == PARM_DECL)
5658 /* If declaration already marked, we have a duplicate name.
5659 Complain, and don't use this decl twice. */
5660 if (found && DECL_RESULT (found) != 0)
5662 error_with_decl (found, "multiple parameters named `%s'");
5666 /* If the declaration says "void", complain and ignore it. */
5667 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5669 error_with_decl (found, "parameter `%s' declared void");
5670 TREE_TYPE (found) = integer_type_node;
5671 DECL_ARG_TYPE (found) = integer_type_node;
5672 layout_decl (found, 0);
5675 /* Traditionally, a parm declared float is actually a double. */
5676 if (found && flag_traditional
5677 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5678 TREE_TYPE (found) = double_type_node;
5680 /* If no declaration found, default to int. */
5683 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5685 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5686 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5687 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5689 warning_with_decl (found, "type of `%s' defaults to `int'");
5693 TREE_PURPOSE (parm) = found;
5695 /* Mark this decl as "already found" -- see test, above.
5696 It is safe to use DECL_RESULT for this
5697 since it is not used in PARM_DECLs or CONST_DECLs. */
5698 DECL_RESULT (found) = error_mark_node;
5701 /* Put anything which is on the parmdecls chain and which is
5702 not a PARM_DECL onto the list NONPARMS. (The types of
5703 non-parm things which might appear on the list include
5704 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5705 any actual PARM_DECLs not matched with any names. */
5708 for (parm = parmdecls; parm; )
5710 tree next = TREE_CHAIN (parm);
5711 TREE_CHAIN (parm) = 0;
5713 if (TREE_CODE (parm) != PARM_DECL)
5714 nonparms = chainon (nonparms, parm);
5717 /* Complain about args with incomplete types. */
5718 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5720 error_with_decl (parm, "parameter `%s' has incomplete type");
5721 TREE_TYPE (parm) = error_mark_node;
5724 if (DECL_RESULT (parm) == 0)
5726 error_with_decl (parm,
5727 "declaration for parameter `%s' but no such parameter");
5728 /* Pretend the parameter was not missing.
5729 This gets us to a standard state and minimizes
5730 further error messages. */
5732 = chainon (specparms,
5733 tree_cons (parm, NULL_TREE, NULL_TREE));
5740 /* Chain the declarations together in the order of the list of names. */
5741 /* Store that chain in the function decl, replacing the list of names. */
5743 DECL_ARGUMENTS (fndecl) = 0;
5746 for (last = 0; parm; parm = TREE_CHAIN (parm))
5747 if (TREE_PURPOSE (parm))
5750 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5752 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5753 last = TREE_PURPOSE (parm);
5754 TREE_CHAIN (last) = 0;
5758 /* If there was a previous prototype,
5759 set the DECL_ARG_TYPE of each argument according to
5760 the type previously specified, and report any mismatches. */
5762 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5765 for (parm = DECL_ARGUMENTS (fndecl),
5766 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5767 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5768 != void_type_node));
5769 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5771 if (parm == 0 || type == 0
5772 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5774 error ("number of arguments doesn't match prototype");
5777 /* Type for passing arg must be consistent
5778 with that declared for the arg. */
5779 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
5781 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5782 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5784 /* Adjust argument to match prototype. E.g. a previous
5785 `int foo(float);' prototype causes
5786 `int foo(x) float x; {...}' to be treated like
5787 `int foo(float x) {...}'. This is particularly
5788 useful for argument types like uid_t. */
5789 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5790 #ifdef PROMOTE_PROTOTYPES
5791 if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
5792 && TYPE_PRECISION (TREE_TYPE (parm))
5793 < TYPE_PRECISION (integer_type_node))
5794 DECL_ARG_TYPE (parm) = integer_type_node;
5797 warning ("promoted argument `%s' doesn't match prototype",
5798 IDENTIFIER_POINTER (DECL_NAME (parm)));
5800 /* If -traditional, allow `int' argument to match
5801 `unsigned' prototype. */
5802 else if (! (flag_traditional
5803 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
5804 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
5805 error ("argument `%s' doesn't match prototype",
5806 IDENTIFIER_POINTER (DECL_NAME (parm)));
5809 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5812 /* Otherwise, create a prototype that would match. */
5816 register tree actual, type;
5817 register tree last = 0;
5819 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5821 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
5824 TREE_CHAIN (last) = type;
5829 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5831 TREE_CHAIN (last) = type;
5835 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5836 of the type of this function, but we need to avoid having this
5837 affect the types of other similarly-typed functions, so we must
5838 first force the generation of an identical (but separate) type
5839 node for the relevant function type. The new node we create
5840 will be a variant of the main variant of the original function
5843 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5845 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5848 /* Now store the final chain of decls for the arguments
5849 as the decl-chain of the current lexical scope.
5850 Put the enumerators in as well, at the front so that
5851 DECL_ARGUMENTS is not modified. */
5853 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
5856 /* Make sure the binding level for the top of the function body
5857 gets a BLOCK if there are any in the function.
5858 Otherwise, the dbx output is wrong. */
5860 keep_next_if_subblocks = 1;
5862 /* ??? This might be an improvement,
5863 but needs to be thought about some more. */
5865 keep_next_level_flag = 1;
5868 /* Write a record describing this function definition to the prototypes
5869 file (if requested). */
5871 gen_aux_info_record (fndecl, 1, 0, prototype);
5873 /* Initialize the RTL code for the function. */
5875 init_function_start (fndecl, input_filename, lineno);
5877 /* If this is a varargs function, inform function.c. */
5879 if (c_function_varargs)
5882 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
5884 declare_function_name ();
5886 /* Set up parameters and prepare for return, for the function. */
5888 expand_function_start (fndecl, 0);
5890 /* If this function is `main', emit a call to `__main'
5891 to run global initializers, etc. */
5892 if (DECL_NAME (fndecl)
5893 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
5894 && DECL_CONTEXT (fndecl) == NULL_TREE)
5895 expand_main_function ();
5898 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5899 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
5900 stands for an ellipsis in the identifier list.
5902 PARMLIST is the data returned by get_parm_info for the
5903 parmlist that follows the semicolon.
5905 We return a value of the same sort that get_parm_info returns,
5906 except that it describes the combination of identifiers and parmlist. */
5909 combine_parm_decls (specparms, parmlist, void_at_end)
5910 tree specparms, parmlist;
5913 register tree fndecl = current_function_decl;
5916 tree parmdecls = TREE_PURPOSE (parmlist);
5918 /* This is a chain of any other decls that came in among the parm
5919 declarations. They were separated already by get_parm_info,
5920 so we just need to keep them separate. */
5921 tree nonparms = TREE_VALUE (parmlist);
5925 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5926 DECL_RESULT (parm) = 0;
5928 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5930 register tree tail, found = NULL;
5932 /* See if any of the parmdecls specifies this parm by name. */
5933 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5934 if (DECL_NAME (tail) == TREE_VALUE (parm))
5940 /* If declaration already marked, we have a duplicate name.
5941 Complain, and don't use this decl twice. */
5942 if (found && DECL_RESULT (found) != 0)
5944 error_with_decl (found, "multiple parameters named `%s'");
5948 /* If the declaration says "void", complain and ignore it. */
5949 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5951 error_with_decl (found, "parameter `%s' declared void");
5952 TREE_TYPE (found) = integer_type_node;
5953 DECL_ARG_TYPE (found) = integer_type_node;
5954 layout_decl (found, 0);
5957 /* Traditionally, a parm declared float is actually a double. */
5958 if (found && flag_traditional
5959 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5960 TREE_TYPE (found) = double_type_node;
5962 /* If no declaration found, default to int. */
5965 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5967 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5968 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5969 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5970 error (found, "type of parameter `%s' is not declared");
5974 TREE_PURPOSE (parm) = found;
5976 /* Mark this decl as "already found" -- see test, above.
5977 It is safe to use DECL_RESULT for this
5978 since it is not used in PARM_DECLs or CONST_DECLs. */
5979 DECL_RESULT (found) = error_mark_node;
5982 /* Complain about any actual PARM_DECLs not matched with any names. */
5984 for (parm = parmdecls; parm; )
5986 tree next = TREE_CHAIN (parm);
5987 TREE_CHAIN (parm) = 0;
5989 /* Complain about args with incomplete types. */
5990 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5992 error_with_decl (parm, "parameter `%s' has incomplete type");
5993 TREE_TYPE (parm) = error_mark_node;
5996 if (DECL_RESULT (parm) == 0)
5998 error_with_decl (parm,
5999 "declaration for parameter `%s' but no such parameter");
6000 /* Pretend the parameter was not missing.
6001 This gets us to a standard state and minimizes
6002 further error messages. */
6004 = chainon (specparms,
6005 tree_cons (parm, NULL_TREE, NULL_TREE));
6011 /* Chain the declarations together in the order of the list of names.
6012 At the same time, build up a list of their types, in reverse order. */
6018 for (last = 0; parm; parm = TREE_CHAIN (parm))
6019 if (TREE_PURPOSE (parm))
6022 parmdecls = TREE_PURPOSE (parm);
6024 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6025 last = TREE_PURPOSE (parm);
6026 TREE_CHAIN (last) = 0;
6028 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6033 return saveable_tree_cons (parmdecls, nonparms,
6034 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6036 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6039 /* Finish up a function declaration and compile that function
6040 all the way to assembler language output. The free the storage
6041 for the function definition.
6043 This is called after parsing the body of the function definition.
6045 NESTED is nonzero if the function being finished is nested in another. */
6048 finish_function (nested)
6051 register tree fndecl = current_function_decl;
6053 /* TREE_READONLY (fndecl) = 1;
6054 This caused &foo to be of type ptr-to-const-function
6055 which then got a warning when stored in a ptr-to-function variable. */
6058 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6060 /* Must mark the RESULT_DECL as being in this function. */
6062 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6064 /* Obey `register' declarations if `setjmp' is called in this fn. */
6065 if (flag_traditional && current_function_calls_setjmp)
6067 setjmp_protect (DECL_INITIAL (fndecl));
6068 setjmp_protect_args ();
6071 #ifdef DEFAULT_MAIN_RETURN
6072 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6074 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6075 != integer_type_node)
6076 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6079 /* Make it so that `main' always returns success by default. */
6080 DEFAULT_MAIN_RETURN;
6085 /* Generate rtl for function exit. */
6086 expand_function_end (input_filename, lineno);
6088 /* So we can tell if jump_optimize sets it to 1. */
6091 /* Run the optimizers and output the assembler code for this function. */
6092 rest_of_compilation (fndecl);
6094 current_function_returns_null |= can_reach_end;
6096 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6097 warning ("`volatile' function does return");
6098 else if (warn_return_type && can_reach_end
6099 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6100 /* If this function returns non-void and control can drop through,
6102 warning ("control reaches end of non-void function");
6103 /* With just -W, complain only if function returns both with
6104 and without a value. */
6105 else if (extra_warnings
6106 && current_function_returns_value && current_function_returns_null)
6107 warning ("this function may return with or without a value");
6109 /* Free all the tree nodes making up this function. */
6110 /* Switch back to allocating nodes permanently
6111 until we start another function. */
6113 permanent_allocation ();
6115 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6117 /* Stop pointing to the local nodes about to be freed. */
6118 /* But DECL_INITIAL must remain nonzero so we know this
6119 was an actual function definition. */
6120 /* For a nested function, this is done in pop_c_function_context. */
6121 DECL_INITIAL (fndecl) = error_mark_node;
6122 DECL_ARGUMENTS (fndecl) = 0;
6127 /* Let the error reporting routines know that we're outside a
6128 function. For a nested function, this value is used in
6129 pop_c_function_context and then reset via pop_function_context. */
6130 current_function_decl = NULL;
6134 /* Save and restore the variables in this file and elsewhere
6135 that keep track of the progress of compilation of the current function.
6136 Used for nested functions. */
6140 struct c_function *next;
6141 tree enum_next_value;
6143 tree shadowed_labels;
6146 int warn_about_return_type;
6148 struct binding_level *binding_level;
6151 struct c_function *c_function_chain;
6153 /* Save and reinitialize the variables
6154 used during compilation of a C function. */
6157 push_c_function_context ()
6159 struct c_function *p
6160 = (struct c_function *) xmalloc (sizeof (struct c_function));
6163 pedwarn ("ANSI C forbids nested functions");
6165 push_function_context ();
6167 p->next = c_function_chain;
6168 c_function_chain = p;
6170 p->enum_next_value = enum_next_value;
6171 p->named_labels = named_labels;
6172 p->shadowed_labels = shadowed_labels;
6173 p->returns_value = current_function_returns_value;
6174 p->returns_null = current_function_returns_null;
6175 p->warn_about_return_type = warn_about_return_type;
6176 p->extern_inline = current_extern_inline;
6177 p->binding_level = current_binding_level;
6180 /* Restore the variables used during compilation of a C function. */
6183 pop_c_function_context ()
6185 struct c_function *p = c_function_chain;
6188 /* Bring back all the labels that were shadowed. */
6189 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6190 if (DECL_NAME (TREE_VALUE (link)) != 0)
6191 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6192 = TREE_VALUE (link);
6194 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6196 /* Stop pointing to the local nodes about to be freed. */
6197 /* But DECL_INITIAL must remain nonzero so we know this
6198 was an actual function definition. */
6199 DECL_INITIAL (current_function_decl) = error_mark_node;
6200 DECL_ARGUMENTS (current_function_decl) = 0;
6203 pop_function_context ();
6205 c_function_chain = p->next;
6207 enum_next_value = p->enum_next_value;
6208 named_labels = p->named_labels;
6209 shadowed_labels = p->shadowed_labels;
6210 current_function_returns_value = p->returns_value;
6211 current_function_returns_null = p->returns_null;
6212 warn_about_return_type = p->warn_about_return_type;
6213 current_extern_inline = p->extern_inline;
6214 current_binding_level = p->binding_level;