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 complex_integer_type_node;
132 tree complex_float_type_node;
133 tree complex_double_type_node;
134 tree complex_long_double_type_node;
136 tree intQI_type_node;
137 tree intHI_type_node;
138 tree intSI_type_node;
139 tree intDI_type_node;
141 tree unsigned_intQI_type_node;
142 tree unsigned_intHI_type_node;
143 tree unsigned_intSI_type_node;
144 tree unsigned_intDI_type_node;
146 /* a VOID_TYPE node. */
150 /* Nodes for types `void *' and `const void *'. */
152 tree ptr_type_node, const_ptr_type_node;
154 /* Nodes for types `char *' and `const char *'. */
156 tree string_type_node, const_string_type_node;
158 /* Type `char[SOMENUMBER]'.
159 Used when an array of char is needed and the size is irrelevant. */
161 tree char_array_type_node;
163 /* Type `int[SOMENUMBER]' or something like it.
164 Used when an array of int needed and the size is irrelevant. */
166 tree int_array_type_node;
168 /* Type `wchar_t[SOMENUMBER]' or something like it.
169 Used when a wide string literal is created. */
171 tree wchar_array_type_node;
173 /* type `int ()' -- used for implicit declaration of functions. */
175 tree default_function_type;
177 /* function types `double (double)' and `double (double, double)', etc. */
179 tree double_ftype_double, double_ftype_double_double;
180 tree int_ftype_int, long_ftype_long;
182 /* Function type `void (void *, void *, int)' and similar ones */
184 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
186 /* Function type `char *(char *, char *)' and similar ones */
187 tree string_ftype_ptr_ptr, int_ftype_string_string;
189 /* Function type `int (const void *, const void *, size_t)' */
190 tree int_ftype_cptr_cptr_sizet;
192 /* Two expressions that are constants with value zero.
193 The first is of type `int', the second of type `void *'. */
195 tree integer_zero_node;
196 tree null_pointer_node;
198 /* A node for the integer constant 1. */
200 tree integer_one_node;
202 /* Nonzero if we have seen an invalid cross reference
203 to a struct, union, or enum, but not yet printed the message. */
205 tree pending_invalid_xref;
206 /* File and line to appear in the eventual error message. */
207 char *pending_invalid_xref_file;
208 int pending_invalid_xref_line;
210 /* While defining an enum type, this is 1 plus the last enumerator
213 static tree enum_next_value;
215 /* Nonzero means that there was overflow computing enum_next_value. */
217 static int enum_overflow;
219 /* Parsing a function declarator leaves a list of parameter names
220 or a chain or parameter decls here. */
222 static tree last_function_parms;
224 /* Parsing a function declarator leaves here a chain of structure
225 and enum types declared in the parmlist. */
227 static tree last_function_parm_tags;
229 /* After parsing the declarator that starts a function definition,
230 `start_function' puts here the list of parameter names or chain of decls.
231 `store_parm_decls' finds it here. */
233 static tree current_function_parms;
235 /* Similar, for last_function_parm_tags. */
236 static tree current_function_parm_tags;
238 /* Similar, for the file and line that the prototype came from if this is
239 an old-style definition. */
240 static char *current_function_prototype_file;
241 static int current_function_prototype_line;
243 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
244 that have names. Here so we can clear out their names' definitions
245 at the end of the function. */
247 static tree named_labels;
249 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
251 static tree shadowed_labels;
253 /* Nonzero when store_parm_decls is called indicates a varargs function.
254 Value not meaningful after store_parm_decls. */
256 static int c_function_varargs;
258 /* The FUNCTION_DECL for the function currently being compiled,
259 or 0 if between functions. */
260 tree current_function_decl;
262 /* Set to 0 at beginning of a function definition, set to 1 if
263 a return statement that specifies a return value is seen. */
265 int current_function_returns_value;
267 /* Set to 0 at beginning of a function definition, set to 1 if
268 a return statement with no argument is seen. */
270 int current_function_returns_null;
272 /* Set to nonzero by `grokdeclarator' for a function
273 whose return type is defaulted, if warnings for this are desired. */
275 static int warn_about_return_type;
277 /* Nonzero when starting a function declared `extern inline'. */
279 static int current_extern_inline;
281 /* For each binding contour we allocate a binding_level structure
282 * which records the names defined in that contour.
285 * 1) one for each function definition,
286 * where internal declarations of the parameters appear.
287 * 2) one for each compound statement,
288 * to record its declarations.
290 * The current meaning of a name can be found by searching the levels from
291 * the current one out to the global one.
294 /* Note that the information in the `names' component of the global contour
295 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
299 /* A chain of _DECL nodes for all variables, constants, functions,
300 and typedef types. These are in the reverse of the order supplied.
304 /* A list of structure, union and enum definitions,
305 * for looking up tag names.
306 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
307 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
308 * or ENUMERAL_TYPE node.
312 /* For each level, a list of shadowed outer-level local definitions
313 to be restored when this level is popped.
314 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
315 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
318 /* For each level (except not the global one),
319 a chain of BLOCK nodes for all the levels
320 that were entered and exited one level down. */
323 /* The BLOCK node for this level, if one has been preallocated.
324 If 0, the BLOCK is allocated (if needed) when the level is popped. */
327 /* The binding level which this one is contained in (inherits from). */
328 struct binding_level *level_chain;
330 /* Nonzero for the level that holds the parameters of a function. */
333 /* Nonzero if this level "doesn't exist" for tags. */
334 char tag_transparent;
336 /* Nonzero if sublevels of this level "don't exist" for tags.
337 This is set in the parm level of a function definition
338 while reading the function body, so that the outermost block
339 of the function body will be tag-transparent. */
340 char subblocks_tag_transparent;
342 /* Nonzero means make a BLOCK for this level regardless of all else. */
345 /* Nonzero means make a BLOCK if this level has any subblocks. */
346 char keep_if_subblocks;
348 /* Number of decls in `names' that have incomplete
349 structure or union types. */
352 /* A list of decls giving the (reversed) specified order of parms,
353 not including any forward-decls in the parmlist.
354 This is so we can put the parms in proper order for assign_parms. */
358 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
360 /* The binding level currently in effect. */
362 static struct binding_level *current_binding_level;
364 /* A chain of binding_level structures awaiting reuse. */
366 static struct binding_level *free_binding_level;
368 /* The outermost binding level, for names of file scope.
369 This is created when the compiler is started and exists
370 through the entire run. */
372 static struct binding_level *global_binding_level;
374 /* Binding level structures are initialized by copying this one. */
376 static struct binding_level clear_binding_level
377 = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0};
379 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
381 static int keep_next_level_flag;
383 /* Nonzero means make a BLOCK for the next level pushed
384 if it has subblocks. */
386 static int keep_next_if_subblocks;
388 /* The chain of outer levels of label scopes.
389 This uses the same data structure used for binding levels,
390 but it works differently: each link in the chain records
391 saved values of named_labels and shadowed_labels for
392 a label binding level outside the current one. */
394 static struct binding_level *label_level_chain;
396 /* Forward declarations. */
398 static tree grokparms (), grokdeclarator ();
400 tree builtin_function ();
401 void shadow_tag_warned ();
403 static tree lookup_tag ();
404 static tree lookup_tag_reverse ();
405 tree lookup_name_current_level ();
406 static char *redeclaration_error_message ();
407 static void layout_array_type ();
409 /* C-specific option variables. */
411 /* Nonzero means allow type mismatches in conditional expressions;
412 just make their values `void'. */
414 int flag_cond_mismatch;
416 /* Nonzero means give `double' the same size as `float'. */
418 int flag_short_double;
420 /* Nonzero means don't recognize the keyword `asm'. */
424 /* Nonzero means don't recognize any builtin functions. */
428 /* Nonzero means don't recognize the non-ANSI builtin functions.
431 int flag_no_nonansi_builtin;
433 /* Nonzero means do some things the same way PCC does. */
435 int flag_traditional;
437 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
439 int flag_signed_bitfields = 1;
440 int explicit_flag_signed_bitfields = 0;
442 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
444 int flag_no_ident = 0;
446 /* Nonzero means warn about implicit declarations. */
450 /* Nonzero means give string constants the type `const char *'
451 to get extra warnings from them. These warnings will be too numerous
452 to be useful, except in thoroughly ANSIfied programs. */
454 int warn_write_strings;
456 /* Nonzero means warn about pointer casts that can drop a type qualifier
457 from the pointer target type. */
461 /* Warn about traditional constructs whose meanings changed in ANSI C. */
463 int warn_traditional;
465 /* Nonzero means warn about sizeof(function) or addition/subtraction
466 of function pointers. */
468 int warn_pointer_arith;
470 /* Nonzero means warn for non-prototype function decls
471 or non-prototyped defs without previous prototype. */
473 int warn_strict_prototypes;
475 /* Nonzero means warn for any global function def
476 without separate previous prototype decl. */
478 int warn_missing_prototypes;
480 /* Nonzero means warn about multiple (redundant) decls for the same single
481 variable or function. */
483 int warn_redundant_decls = 0;
485 /* Nonzero means warn about extern declarations of objects not at
486 file-scope level and about *all* declarations of functions (whether
487 extern or static) not at file-scope level. Note that we exclude
488 implicit function declarations. To get warnings about those, use
491 int warn_nested_externs = 0;
493 /* Warn about *printf or *scanf format/argument anomalies. */
497 /* Warn about a subscript that has type char. */
499 int warn_char_subscripts = 0;
501 /* Warn if a type conversion is done that might have confusing results. */
505 /* Warn if adding () is suggested. */
507 int warn_parentheses;
509 /* Warn if initializer is not completely bracketed. */
511 int warn_missing_braces;
513 /* Nonzero means `$' can be in an identifier.
514 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
516 #ifndef DOLLARS_IN_IDENTIFIERS
517 #define DOLLARS_IN_IDENTIFIERS 1
519 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
521 /* Decode the string P as a language-specific option for C.
522 Return 1 if it is recognized (and handle it);
523 return 0 if not recognized. */
529 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
531 flag_traditional = 1;
532 flag_writable_strings = 1;
533 #if DOLLARS_IN_IDENTIFIERS > 0
534 dollars_in_ident = 1;
537 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
539 flag_traditional = 0;
540 flag_writable_strings = 0;
541 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
543 else if (!strcmp (p, "-fsigned-char"))
544 flag_signed_char = 1;
545 else if (!strcmp (p, "-funsigned-char"))
546 flag_signed_char = 0;
547 else if (!strcmp (p, "-fno-signed-char"))
548 flag_signed_char = 0;
549 else if (!strcmp (p, "-fno-unsigned-char"))
550 flag_signed_char = 1;
551 else if (!strcmp (p, "-fsigned-bitfields")
552 || !strcmp (p, "-fno-unsigned-bitfields"))
554 flag_signed_bitfields = 1;
555 explicit_flag_signed_bitfields = 1;
557 else if (!strcmp (p, "-funsigned-bitfields")
558 || !strcmp (p, "-fno-signed-bitfields"))
560 flag_signed_bitfields = 0;
561 explicit_flag_signed_bitfields = 1;
563 else if (!strcmp (p, "-fshort-enums"))
564 flag_short_enums = 1;
565 else if (!strcmp (p, "-fno-short-enums"))
566 flag_short_enums = 0;
567 else if (!strcmp (p, "-fcond-mismatch"))
568 flag_cond_mismatch = 1;
569 else if (!strcmp (p, "-fno-cond-mismatch"))
570 flag_cond_mismatch = 0;
571 else if (!strcmp (p, "-fshort-double"))
572 flag_short_double = 1;
573 else if (!strcmp (p, "-fno-short-double"))
574 flag_short_double = 0;
575 else if (!strcmp (p, "-fasm"))
577 else if (!strcmp (p, "-fno-asm"))
579 else if (!strcmp (p, "-fbuiltin"))
581 else if (!strcmp (p, "-fno-builtin"))
583 else if (!strcmp (p, "-fno-ident"))
585 else if (!strcmp (p, "-fident"))
587 else if (!strcmp (p, "-ansi"))
588 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
589 else if (!strcmp (p, "-Wimplicit"))
591 else if (!strcmp (p, "-Wno-implicit"))
593 else if (!strcmp (p, "-Wwrite-strings"))
594 warn_write_strings = 1;
595 else if (!strcmp (p, "-Wno-write-strings"))
596 warn_write_strings = 0;
597 else if (!strcmp (p, "-Wcast-qual"))
599 else if (!strcmp (p, "-Wno-cast-qual"))
601 else if (!strcmp (p, "-Wpointer-arith"))
602 warn_pointer_arith = 1;
603 else if (!strcmp (p, "-Wno-pointer-arith"))
604 warn_pointer_arith = 0;
605 else if (!strcmp (p, "-Wstrict-prototypes"))
606 warn_strict_prototypes = 1;
607 else if (!strcmp (p, "-Wno-strict-prototypes"))
608 warn_strict_prototypes = 0;
609 else if (!strcmp (p, "-Wmissing-prototypes"))
610 warn_missing_prototypes = 1;
611 else if (!strcmp (p, "-Wno-missing-prototypes"))
612 warn_missing_prototypes = 0;
613 else if (!strcmp (p, "-Wredundant-decls"))
614 warn_redundant_decls = 1;
615 else if (!strcmp (p, "-Wno-redundant-decls"))
616 warn_redundant_decls = 0;
617 else if (!strcmp (p, "-Wnested-externs"))
618 warn_nested_externs = 1;
619 else if (!strcmp (p, "-Wno-nested-externs"))
620 warn_nested_externs = 0;
621 else if (!strcmp (p, "-Wtraditional"))
622 warn_traditional = 1;
623 else if (!strcmp (p, "-Wno-traditional"))
624 warn_traditional = 0;
625 else if (!strcmp (p, "-Wformat"))
627 else if (!strcmp (p, "-Wno-format"))
629 else if (!strcmp (p, "-Wchar-subscripts"))
630 warn_char_subscripts = 1;
631 else if (!strcmp (p, "-Wno-char-subscripts"))
632 warn_char_subscripts = 0;
633 else if (!strcmp (p, "-Wconversion"))
635 else if (!strcmp (p, "-Wno-conversion"))
637 else if (!strcmp (p, "-Wparentheses"))
638 warn_parentheses = 1;
639 else if (!strcmp (p, "-Wno-parentheses"))
640 warn_parentheses = 0;
641 else if (!strcmp (p, "-Wreturn-type"))
642 warn_return_type = 1;
643 else if (!strcmp (p, "-Wno-return-type"))
644 warn_return_type = 0;
645 else if (!strcmp (p, "-Wcomment"))
646 ; /* cpp handles this one. */
647 else if (!strcmp (p, "-Wno-comment"))
648 ; /* cpp handles this one. */
649 else if (!strcmp (p, "-Wcomments"))
650 ; /* cpp handles this one. */
651 else if (!strcmp (p, "-Wno-comments"))
652 ; /* cpp handles this one. */
653 else if (!strcmp (p, "-Wtrigraphs"))
654 ; /* cpp handles this one. */
655 else if (!strcmp (p, "-Wno-trigraphs"))
656 ; /* cpp handles this one. */
657 else if (!strcmp (p, "-Wimport"))
658 ; /* cpp handles this one. */
659 else if (!strcmp (p, "-Wno-import"))
660 ; /* cpp handles this one. */
661 else if (!strcmp (p, "-Wmissing-braces"))
662 warn_missing_braces = 1;
663 else if (!strcmp (p, "-Wno-missing-braces"))
664 warn_missing_braces = 0;
665 else if (!strcmp (p, "-Wall"))
668 /* We save the value of warn_uninitialized, since if they put
669 -Wuninitialized on the command line, we need to generate a
670 warning about not using it without also specifying -O. */
671 if (warn_uninitialized != 1)
672 warn_uninitialized = 2;
674 warn_return_type = 1;
678 warn_char_subscripts = 1;
679 warn_parentheses = 1;
680 warn_missing_braces = 1;
688 /* Hooks for print_node. */
701 print_lang_identifier (file, node, indent)
706 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
707 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
708 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
709 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
710 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
711 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
714 /* Hook called at end of compilation to assume 1 elt
715 for a top-level array decl that wasn't complete before. */
718 finish_incomplete_decl (decl)
721 if (TREE_CODE (decl) == VAR_DECL && TREE_TYPE (decl) != error_mark_node)
723 tree type = TREE_TYPE (decl);
724 if (TREE_CODE (type) == ARRAY_TYPE
725 && TYPE_DOMAIN (type) == 0
726 && TREE_CODE (decl) != TYPE_DECL)
728 complete_array_type (type, NULL_TREE, 1);
730 layout_decl (decl, 0);
735 /* Create a new `struct binding_level'. */
738 struct binding_level *
739 make_binding_level ()
742 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
745 /* Nonzero if we are currently in the global binding level. */
750 return current_binding_level == global_binding_level;
756 keep_next_level_flag = 1;
759 /* Nonzero if the current level needs to have a BLOCK made. */
764 return ((current_binding_level->keep_if_subblocks
765 && current_binding_level->blocks != 0)
766 || current_binding_level->keep
767 || current_binding_level->names != 0
768 || (current_binding_level->tags != 0
769 && !current_binding_level->tag_transparent));
772 /* Identify this binding level as a level of parameters.
773 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
774 But it turns out there is no way to pass the right value for
775 DEFINITION_FLAG, so we ignore it. */
778 declare_parm_level (definition_flag)
781 current_binding_level->parm_flag = 1;
784 /* Nonzero if currently making parm declarations. */
789 return current_binding_level->parm_flag;
792 /* Enter a new binding level.
793 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
794 not for that of tags. */
797 pushlevel (tag_transparent)
800 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
802 /* If this is the top level of a function,
803 just make sure that NAMED_LABELS is 0. */
805 if (current_binding_level == global_binding_level)
810 /* Reuse or create a struct for this binding level. */
812 if (free_binding_level)
814 newlevel = free_binding_level;
815 free_binding_level = free_binding_level->level_chain;
819 newlevel = make_binding_level ();
822 /* Add this level to the front of the chain (stack) of levels that
825 *newlevel = clear_binding_level;
826 newlevel->tag_transparent
828 || (current_binding_level
829 ? current_binding_level->subblocks_tag_transparent
831 newlevel->level_chain = current_binding_level;
832 current_binding_level = newlevel;
833 newlevel->keep = keep_next_level_flag;
834 keep_next_level_flag = 0;
835 newlevel->keep_if_subblocks = keep_next_if_subblocks;
836 keep_next_if_subblocks = 0;
839 /* Exit a binding level.
840 Pop the level off, and restore the state of the identifier-decl mappings
841 that were in effect when this level was entered.
843 If KEEP is nonzero, this level had explicit declarations, so
844 and create a "block" (a BLOCK node) for the level
845 to record its declarations and subblocks for symbol table output.
847 If FUNCTIONBODY is nonzero, this level is the body of a function,
848 so create a block as if KEEP were set and also clear out all
851 If REVERSE is nonzero, reverse the order of decls before putting
852 them into the BLOCK. */
855 poplevel (keep, reverse, functionbody)
861 /* The chain of decls was accumulated in reverse order.
862 Put it into forward order, just for cleanliness. */
864 tree tags = current_binding_level->tags;
865 tree subblocks = current_binding_level->blocks;
868 int block_previously_created;
870 keep |= current_binding_level->keep;
872 /* This warning is turned off because it causes warnings for
873 declarations like `extern struct foo *x'. */
875 /* Warn about incomplete structure types in this level. */
876 for (link = tags; link; link = TREE_CHAIN (link))
877 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
879 tree type = TREE_VALUE (link);
881 switch (TREE_CODE (type))
884 errmsg = "`struct %s' incomplete in scope ending here";
887 errmsg = "`union %s' incomplete in scope ending here";
890 errmsg = "`enum %s' incomplete in scope ending here";
893 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
894 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
896 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
897 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
901 /* Get the decls in the order they were written.
902 Usually current_binding_level->names is in reverse order.
903 But parameter decls were previously put in forward order. */
906 current_binding_level->names
907 = decls = nreverse (current_binding_level->names);
909 decls = current_binding_level->names;
911 /* Output any nested inline functions within this block
912 if they weren't already output. */
914 for (decl = decls; decl; decl = TREE_CHAIN (decl))
915 if (TREE_CODE (decl) == FUNCTION_DECL
916 && ! TREE_ASM_WRITTEN (decl)
917 && DECL_INITIAL (decl) != 0
918 && TREE_ADDRESSABLE (decl))
920 /* If this decl was copied from a file-scope decl
921 on account of a block-scope extern decl,
922 propagate TREE_ADDRESSABLE to the file-scope decl. */
923 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
924 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
926 output_inline_function (decl);
929 /* If there were any declarations or structure tags in that level,
930 or if this level is a function body,
931 create a BLOCK to record them for the life of this function. */
934 block_previously_created = (current_binding_level->this_block != 0);
935 if (block_previously_created)
936 block = current_binding_level->this_block;
937 else if (keep || functionbody
938 || (current_binding_level->keep_if_subblocks && subblocks != 0))
939 block = make_node (BLOCK);
942 BLOCK_VARS (block) = decls;
943 BLOCK_TYPE_TAGS (block) = tags;
944 BLOCK_SUBBLOCKS (block) = subblocks;
945 remember_end_note (block);
948 /* In each subblock, record that this is its superior. */
950 for (link = subblocks; link; link = TREE_CHAIN (link))
951 BLOCK_SUPERCONTEXT (link) = block;
953 /* Clear out the meanings of the local variables of this level. */
955 for (link = decls; link; link = TREE_CHAIN (link))
957 if (DECL_NAME (link) != 0)
959 /* If the ident. was used or addressed via a local extern decl,
960 don't forget that fact. */
961 if (DECL_EXTERNAL (link))
963 if (TREE_USED (link))
964 TREE_USED (DECL_NAME (link)) = 1;
965 if (TREE_ADDRESSABLE (link))
966 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
968 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
972 /* Restore all name-meanings of the outer levels
973 that were shadowed by this level. */
975 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
976 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
978 /* If the level being exited is the top level of a function,
979 check over all the labels, and clear out the current
980 (function local) meanings of their names. */
984 /* If this is the top level block of a function,
985 the vars are the function's parameters.
986 Don't leave them in the BLOCK because they are
987 found in the FUNCTION_DECL instead. */
989 BLOCK_VARS (block) = 0;
991 /* Clear out the definitions of all label names,
992 since their scopes end here,
993 and add them to BLOCK_VARS. */
995 for (link = named_labels; link; link = TREE_CHAIN (link))
997 register tree label = TREE_VALUE (link);
999 if (DECL_INITIAL (label) == 0)
1001 error_with_decl (label, "label `%s' used but not defined");
1002 /* Avoid crashing later. */
1003 define_label (input_filename, lineno,
1006 else if (warn_unused && !TREE_USED (label))
1007 warning_with_decl (label, "label `%s' defined but not used");
1008 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1010 /* Put the labels into the "variables" of the
1011 top-level block, so debugger can see them. */
1012 TREE_CHAIN (label) = BLOCK_VARS (block);
1013 BLOCK_VARS (block) = label;
1017 /* Pop the current level, and free the structure for reuse. */
1020 register struct binding_level *level = current_binding_level;
1021 current_binding_level = current_binding_level->level_chain;
1023 level->level_chain = free_binding_level;
1024 free_binding_level = level;
1027 /* Dispose of the block that we just made inside some higher level. */
1029 DECL_INITIAL (current_function_decl) = block;
1032 if (!block_previously_created)
1033 current_binding_level->blocks
1034 = chainon (current_binding_level->blocks, block);
1036 /* If we did not make a block for the level just exited,
1037 any blocks made for inner levels
1038 (since they cannot be recorded as subblocks in that level)
1039 must be carried forward so they will later become subblocks
1040 of something else. */
1042 current_binding_level->blocks
1043 = chainon (current_binding_level->blocks, subblocks);
1045 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1046 binding contour so that they point to the appropriate construct, i.e.
1047 either to the current FUNCTION_DECL node, or else to the BLOCK node
1048 we just constructed.
1050 Note that for tagged types whose scope is just the formal parameter
1051 list for some function type specification, we can't properly set
1052 their TYPE_CONTEXTs here, because we don't have a pointer to the
1053 appropriate FUNCTION_TYPE node readily available to us. For those
1054 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1055 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1056 node which will represent the "scope" for these "parameter list local"
1061 for (link = tags; link; link = TREE_CHAIN (link))
1062 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1064 for (link = tags; link; link = TREE_CHAIN (link))
1065 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1068 TREE_USED (block) = 1;
1072 /* Delete the node BLOCK from the current binding level.
1073 This is used for the block inside a stmt expr ({...})
1074 so that the block can be reinserted where appropriate. */
1077 delete_block (block)
1081 if (current_binding_level->blocks == block)
1082 current_binding_level->blocks = TREE_CHAIN (block);
1083 for (t = current_binding_level->blocks; t;)
1085 if (TREE_CHAIN (t) == block)
1086 TREE_CHAIN (t) = TREE_CHAIN (block);
1090 TREE_CHAIN (block) = NULL;
1091 /* Clear TREE_USED which is always set by poplevel.
1092 The flag is set again if insert_block is called. */
1093 TREE_USED (block) = 0;
1096 /* Insert BLOCK at the end of the list of subblocks of the
1097 current binding level. This is used when a BIND_EXPR is expanded,
1098 to handle the BLOCK node inside teh BIND_EXPR. */
1101 insert_block (block)
1104 TREE_USED (block) = 1;
1105 current_binding_level->blocks
1106 = chainon (current_binding_level->blocks, block);
1109 /* Set the BLOCK node for the innermost scope
1110 (the one we are currently in). */
1114 register tree block;
1116 current_binding_level->this_block = block;
1122 register struct binding_level *newlevel;
1124 /* Reuse or create a struct for this binding level. */
1126 if (free_binding_level)
1128 newlevel = free_binding_level;
1129 free_binding_level = free_binding_level->level_chain;
1133 newlevel = make_binding_level ();
1136 /* Add this level to the front of the chain (stack) of label levels. */
1138 newlevel->level_chain = label_level_chain;
1139 label_level_chain = newlevel;
1141 newlevel->names = named_labels;
1142 newlevel->shadowed = shadowed_labels;
1144 shadowed_labels = 0;
1150 register struct binding_level *level = label_level_chain;
1153 /* Clear out the definitions of the declared labels in this level.
1154 Leave in the list any ordinary, non-declared labels. */
1155 for (link = named_labels, prev = 0; link;)
1157 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1159 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1161 error_with_decl (TREE_VALUE (link),
1162 "label `%s' used but not defined");
1163 /* Avoid crashing later. */
1164 define_label (input_filename, lineno,
1165 DECL_NAME (TREE_VALUE (link)));
1167 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1168 warning_with_decl (TREE_VALUE (link),
1169 "label `%s' defined but not used");
1170 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1172 /* Delete this element from the list. */
1173 link = TREE_CHAIN (link);
1175 TREE_CHAIN (prev) = link;
1177 named_labels = link;
1182 link = TREE_CHAIN (link);
1186 /* Bring back all the labels that were shadowed. */
1187 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1188 if (DECL_NAME (TREE_VALUE (link)) != 0)
1189 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1190 = TREE_VALUE (link);
1192 named_labels = chainon (named_labels, level->names);
1193 shadowed_labels = level->shadowed;
1195 /* Pop the current level, and free the structure for reuse. */
1196 label_level_chain = label_level_chain->level_chain;
1197 level->level_chain = free_binding_level;
1198 free_binding_level = level;
1201 /* Push a definition or a declaration of struct, union or enum tag "name".
1202 "type" should be the type node.
1203 We assume that the tag "name" is not already defined.
1205 Note that the definition may really be just a forward reference.
1206 In that case, the TYPE_SIZE will be zero. */
1209 pushtag (name, type)
1212 register struct binding_level *b;
1214 /* Find the proper binding level for this type tag. */
1216 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1221 /* Record the identifier as the type's name if it has none. */
1223 if (TYPE_NAME (type) == 0)
1224 TYPE_NAME (type) = name;
1227 if (b == global_binding_level)
1228 b->tags = perm_tree_cons (name, type, b->tags);
1230 b->tags = saveable_tree_cons (name, type, b->tags);
1232 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1233 tagged type we just added to the current binding level. This fake
1234 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1235 to output a representation of a tagged type, and it also gives
1236 us a convenient place to record the "scope start" address for the
1239 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1242 /* Handle when a new declaration NEWDECL
1243 has the same name as an old one OLDDECL
1244 in the same binding contour.
1245 Prints an error message if appropriate.
1247 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1248 Otherwise, return 0. */
1251 duplicate_decls (newdecl, olddecl)
1252 register tree newdecl, olddecl;
1254 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1255 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1256 && DECL_INITIAL (newdecl) != 0);
1257 tree oldtype = TREE_TYPE (olddecl);
1258 tree newtype = TREE_TYPE (newdecl);
1260 if (TREE_CODE (newtype) == ERROR_MARK
1261 || TREE_CODE (oldtype) == ERROR_MARK)
1264 /* New decl is completely inconsistent with the old one =>
1265 tell caller to replace the old one.
1266 This is always an error except in the case of shadowing a builtin. */
1267 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1269 if (TREE_CODE (olddecl) == FUNCTION_DECL
1270 && DECL_BUILT_IN (olddecl))
1272 /* If you declare a built-in function name as static, the
1273 built-in definition is overridden,
1274 but optionally warn this was a bad choice of name. */
1275 if (!TREE_PUBLIC (newdecl))
1278 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1280 /* Likewise, if the built-in is not ansi, then programs can
1281 override it even globally without an error. */
1282 else if (DECL_BUILT_IN_NONANSI (olddecl))
1283 warning_with_decl (newdecl,
1284 "built-in function `%s' declared as non-function");
1286 error_with_decl (newdecl,
1287 "built-in function `%s' declared as non-function");
1289 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1290 && DECL_BUILT_IN_NONANSI (olddecl))
1292 /* If overriding decl is static,
1293 optionally warn this was a bad choice of name. */
1294 if (!TREE_PUBLIC (newdecl))
1297 warning_with_decl (newdecl, "shadowing library function `%s'");
1299 /* Otherwise, always warn. */
1301 warning_with_decl (newdecl,
1302 "library function `%s' declared as non-function");
1306 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1307 error_with_decl (olddecl, "previous declaration of `%s'");
1313 /* For real parm decl following a forward decl,
1314 return 1 so old decl will be reused. */
1315 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1316 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1319 /* The new declaration is the same kind of object as the old one.
1320 The declarations may partially match. Print warnings if they don't
1321 match enough. Ultimately, copy most of the information from the new
1322 decl to the old one, and keep using the old one. */
1324 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1325 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1326 && DECL_INITIAL (olddecl) == 0)
1327 /* If -traditional, avoid error for redeclaring fcn
1328 after implicit decl. */
1330 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1331 && DECL_BUILT_IN (olddecl))
1333 /* A function declaration for a built-in function. */
1334 if (!TREE_PUBLIC (newdecl))
1336 /* If you declare a built-in function name as static, the
1337 built-in definition is overridden,
1338 but optionally warn this was a bad choice of name. */
1340 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1341 /* Discard the old built-in function. */
1344 else if (!types_match)
1346 /* Accept the return type of the new declaration if same modes. */
1347 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1348 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1349 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1351 /* Function types may be shared, so we can't just modify
1352 the return type of olddecl's function type. */
1354 = build_function_type (newreturntype,
1355 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1357 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1359 TREE_TYPE (olddecl) = newtype;
1361 /* Accept harmless mismatch in first argument type also.
1363 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1364 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0
1365 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))) != 0
1366 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))) != 0
1367 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))))
1369 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))))))
1371 /* Function types may be shared, so we can't just modify
1372 the return type of olddecl's function type. */
1374 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl)),
1375 tree_cons (NULL_TREE,
1376 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))),
1377 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl)))));
1379 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1381 TREE_TYPE (olddecl) = newtype;
1386 /* If types don't match for a built-in, throw away the built-in. */
1387 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1391 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1392 && DECL_SOURCE_LINE (olddecl) == 0)
1394 /* A function declaration for a predeclared function
1395 that isn't actually built in. */
1396 if (!TREE_PUBLIC (newdecl))
1398 /* If you declare it as static, the
1399 default definition is overridden. */
1402 else if (!types_match)
1404 /* If the types don't match, preserve volatility indication.
1405 Later on, we will discard everything else about the
1406 default declaration. */
1407 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1410 /* Permit char *foo () to match void *foo (...) if not pedantic,
1411 if one of them came from a system header file. */
1412 else if (!types_match
1413 && TREE_CODE (olddecl) == FUNCTION_DECL
1414 && TREE_CODE (newdecl) == FUNCTION_DECL
1415 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1416 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1417 && (DECL_IN_SYSTEM_HEADER (olddecl)
1418 || DECL_IN_SYSTEM_HEADER (newdecl))
1419 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1420 && TYPE_ARG_TYPES (oldtype) == 0
1421 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1422 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1424 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1425 && TYPE_ARG_TYPES (newtype) == 0
1426 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1427 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1430 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1431 /* Make sure we keep void * as ret type, not char *. */
1432 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1433 TREE_TYPE (newdecl) = newtype = oldtype;
1435 else if (!types_match
1436 /* Permit char *foo (int, ...); followed by char *foo ();
1438 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1440 /* Return types must still match. */
1441 && comptypes (TREE_TYPE (oldtype),
1442 TREE_TYPE (newtype))
1443 && TYPE_ARG_TYPES (newtype) == 0))
1445 error_with_decl (newdecl, "conflicting types for `%s'");
1446 /* Check for function type mismatch
1447 involving an empty arglist vs a nonempty one. */
1448 if (TREE_CODE (olddecl) == FUNCTION_DECL
1449 && comptypes (TREE_TYPE (oldtype),
1450 TREE_TYPE (newtype))
1451 && ((TYPE_ARG_TYPES (oldtype) == 0
1452 && DECL_INITIAL (olddecl) == 0)
1454 (TYPE_ARG_TYPES (newtype) == 0
1455 && DECL_INITIAL (newdecl) == 0)))
1457 /* Classify the problem further. */
1458 register tree t = TYPE_ARG_TYPES (oldtype);
1460 t = TYPE_ARG_TYPES (newtype);
1461 for (; t; t = TREE_CHAIN (t))
1463 register tree type = TREE_VALUE (t);
1465 if (TREE_CHAIN (t) == 0
1466 && TYPE_MAIN_VARIANT (type) != void_type_node)
1468 error ("A parameter list with an ellipsis can't match");
1469 error ("an empty parameter name list declaration.");
1473 if (TYPE_MAIN_VARIANT (type) == float_type_node
1474 || C_PROMOTING_INTEGER_TYPE_P (type))
1476 error ("An argument type that has a default promotion");
1477 error ("can't match an empty parameter name list declaration.");
1482 error_with_decl (olddecl, "previous declaration of `%s'");
1486 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1489 error_with_decl (newdecl, errmsg);
1490 error_with_decl (olddecl,
1491 ((DECL_INITIAL (olddecl)
1492 && current_binding_level == global_binding_level)
1493 ? "`%s' previously defined here"
1494 : "`%s' previously declared here"));
1496 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1497 && DECL_INITIAL (olddecl) != 0
1498 && TYPE_ARG_TYPES (oldtype) == 0
1499 && TYPE_ARG_TYPES (newtype) != 0)
1501 register tree type, parm;
1503 /* Prototype decl follows defn w/o prototype. */
1505 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1506 type = TYPE_ARG_TYPES (newtype),
1508 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1509 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1510 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1512 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1513 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1515 errmsg = "prototype for `%s' follows and number of arguments";
1518 /* Type for passing arg must be consistent
1519 with that declared for the arg. */
1520 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1521 /* If -traditional, allow `unsigned int' instead of `int'
1522 in the prototype. */
1523 && (! (flag_traditional
1524 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1525 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1527 errmsg = "prototype for `%s' follows and argument %d";
1533 error_with_decl (newdecl, errmsg, nargs);
1534 error_with_decl (olddecl,
1535 "doesn't match non-prototype definition here");
1539 warning_with_decl (newdecl, "prototype for `%s' follows");
1540 warning_with_decl (olddecl, "non-prototype definition here");
1543 /* Warn about mismatches in various flags. */
1546 /* Warn if function is now inline
1547 but was previously declared not inline and has been called. */
1548 if (TREE_CODE (olddecl) == FUNCTION_DECL
1549 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1550 && TREE_USED (olddecl))
1551 warning_with_decl (newdecl,
1552 "`%s' declared inline after being called");
1553 if (TREE_CODE (olddecl) == FUNCTION_DECL
1554 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1555 && DECL_INITIAL (olddecl) != 0)
1556 warning_with_decl (newdecl,
1557 "`%s' declared inline after its definition");
1558 /* It is nice to warn when a function is declared
1559 global first and then static. */
1560 if (TREE_CODE (olddecl) == FUNCTION_DECL
1561 && TREE_PUBLIC (olddecl)
1562 && !TREE_PUBLIC (newdecl))
1563 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1565 /* These bits are logically part of the type, for variables.
1566 But not for functions
1567 (where qualifiers are not valid ANSI anyway). */
1568 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1569 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1570 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1571 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1575 /* Optionally warn about more than one declaration for the same name. */
1576 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1577 /* Dont warn about a function declaration
1578 followed by a definition. */
1579 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1580 && DECL_INITIAL (olddecl) == 0))
1582 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1583 warning_with_decl (olddecl, "previous declaration of `%s'");
1586 /* Copy all the DECL_... slots specified in the new decl
1587 except for any that we copy here from the old type.
1589 Past this point, we don't change OLDTYPE and NEWTYPE
1590 even if we change the types of NEWDECL and OLDDECL. */
1594 /* Merge the data types specified in the two decls. */
1595 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1597 = TREE_TYPE (olddecl)
1598 = common_type (newtype, oldtype);
1600 /* Lay the type out, unless already done. */
1601 if (oldtype != TREE_TYPE (newdecl))
1603 if (TREE_TYPE (newdecl) != error_mark_node)
1604 layout_type (TREE_TYPE (newdecl));
1605 if (TREE_CODE (newdecl) != FUNCTION_DECL
1606 && TREE_CODE (newdecl) != TYPE_DECL
1607 && TREE_CODE (newdecl) != CONST_DECL)
1608 layout_decl (newdecl, 0);
1612 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1613 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1614 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1615 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1616 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1619 /* Keep the old rtl since we can safely use it. */
1620 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1622 /* Merge the type qualifiers. */
1623 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1624 && !TREE_THIS_VOLATILE (newdecl))
1625 TREE_THIS_VOLATILE (olddecl) = 0;
1626 if (TREE_READONLY (newdecl))
1627 TREE_READONLY (olddecl) = 1;
1628 if (TREE_THIS_VOLATILE (newdecl))
1630 TREE_THIS_VOLATILE (olddecl) = 1;
1631 if (TREE_CODE (newdecl) == VAR_DECL)
1632 make_var_volatile (newdecl);
1635 /* Keep source location of definition rather than declaration. */
1636 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1638 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1639 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1642 /* Merge the unused-warning information. */
1643 if (DECL_IN_SYSTEM_HEADER (olddecl))
1644 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1645 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1646 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1648 /* Merge the initialization information. */
1649 if (DECL_INITIAL (newdecl) == 0)
1650 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1652 /* If cannot merge, then use the new type and qualifiers,
1653 and don't preserve the old rtl. */
1656 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1657 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1658 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1659 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1662 /* Merge the storage class information. */
1663 /* For functions, static overrides non-static. */
1664 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1666 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1667 /* This is since we don't automatically
1668 copy the attributes of NEWDECL into OLDDECL. */
1669 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1670 /* If this clears `static', clear it in the identifier too. */
1671 if (! TREE_PUBLIC (olddecl))
1672 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1674 if (DECL_EXTERNAL (newdecl))
1676 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1677 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1678 /* An extern decl does not override previous storage class. */
1679 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1683 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1684 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1687 /* If either decl says `inline', this fn is inline,
1688 unless its definition was passed already. */
1689 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1690 DECL_INLINE (olddecl) = 1;
1691 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1693 /* Get rid of any built-in function if new arg types don't match it
1694 or if we have a function definition. */
1695 if (TREE_CODE (newdecl) == FUNCTION_DECL
1696 && DECL_BUILT_IN (olddecl)
1697 && (!types_match || new_is_definition))
1699 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1700 DECL_BUILT_IN (olddecl) = 0;
1703 /* If redeclaring a builtin function, and not a definition,
1705 Also preserve various other info from the definition. */
1706 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1708 if (DECL_BUILT_IN (olddecl))
1710 DECL_BUILT_IN (newdecl) = 1;
1711 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1714 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1716 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1717 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1718 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1719 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1722 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1723 But preserve OLDdECL's DECL_UID. */
1725 register unsigned olddecl_uid = DECL_UID (olddecl);
1727 bcopy ((char *) newdecl + sizeof (struct tree_common),
1728 (char *) olddecl + sizeof (struct tree_common),
1729 sizeof (struct tree_decl) - sizeof (struct tree_common));
1730 DECL_UID (olddecl) = olddecl_uid;
1736 /* Record a decl-node X as belonging to the current lexical scope.
1737 Check for errors (such as an incompatible declaration for the same
1738 name already seen in the same scope).
1740 Returns either X or an old decl for the same name.
1741 If an old decl is returned, it may have been smashed
1742 to agree with what X says. */
1749 register tree name = DECL_NAME (x);
1750 register struct binding_level *b = current_binding_level;
1752 DECL_CONTEXT (x) = current_function_decl;
1753 /* A local extern declaration for a function doesn't constitute nesting.
1754 A local auto declaration does, since it's a forward decl
1755 for a nested function coming later. */
1756 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1757 && DECL_EXTERNAL (x))
1758 DECL_CONTEXT (x) = 0;
1760 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1761 && x != IDENTIFIER_IMPLICIT_DECL (name))
1762 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1769 t = lookup_name_current_level (name);
1770 if (t != 0 && t == error_mark_node)
1771 /* error_mark_node is 0 for a while during initialization! */
1774 error_with_decl (x, "`%s' used prior to declaration");
1779 file = DECL_SOURCE_FILE (t);
1780 line = DECL_SOURCE_LINE (t);
1783 if (t != 0 && duplicate_decls (x, t))
1785 if (TREE_CODE (t) == PARM_DECL)
1787 /* Don't allow more than one "real" duplicate
1788 of a forward parm decl. */
1789 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1792 /* If this decl is `static' and an implicit decl was seen previously,
1793 warn. But don't complain if -traditional,
1794 since traditional compilers don't complain. */
1795 if (!flag_traditional && TREE_PUBLIC (name)
1796 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1797 /* We used to warn also for explicit extern followed by static,
1798 but sometimes you need to do it that way. */
1799 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1801 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1802 IDENTIFIER_POINTER (name));
1803 pedwarn_with_file_and_line (file, line,
1804 "previous declaration of `%s'",
1805 IDENTIFIER_POINTER (name));
1811 /* If we are processing a typedef statement, generate a whole new
1812 ..._TYPE node (which will be just an variant of the existing
1813 ..._TYPE node with identical properties) and then install the
1814 TYPE_DECL node generated to represent the typedef name as the
1815 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1817 The whole point here is to end up with a situation where each
1818 and every ..._TYPE node the compiler creates will be uniquely
1819 associated with AT MOST one node representing a typedef name.
1820 This way, even though the compiler substitutes corresponding
1821 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1822 early on, later parts of the compiler can always do the reverse
1823 translation and get back the corresponding typedef name. For
1826 typedef struct S MY_TYPE;
1829 Later parts of the compiler might only know that `object' was of
1830 type `struct S' if if were not for code just below. With this
1831 code however, later parts of the compiler see something like:
1833 struct S' == struct S
1834 typedef struct S' MY_TYPE;
1837 And they can then deduce (from the node for type struct S') that
1838 the original object declaration was:
1842 Being able to do this is important for proper support of protoize,
1843 and also for generating precise symbolic debugging information
1844 which takes full account of the programmer's (typedef) vocabulary.
1846 Obviously, we don't want to generate a duplicate ..._TYPE node if
1847 the TYPE_DECL node that we are now processing really represents a
1848 standard built-in type.
1850 Since all standard types are effectively declared at line zero
1851 in the source file, we can easily check to see if we are working
1852 on a standard type by checking the current value of lineno. */
1854 if (TREE_CODE (x) == TYPE_DECL)
1856 if (DECL_SOURCE_LINE (x) == 0)
1858 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1859 TYPE_NAME (TREE_TYPE (x)) = x;
1861 else if (TREE_TYPE (x) != error_mark_node)
1863 tree tt = TREE_TYPE (x);
1865 tt = build_type_copy (tt);
1871 /* Multiple external decls of the same identifier ought to match.
1872 Check against both global declarations and out of scope (limbo) block
1875 We get warnings about inline functions where they are defined.
1876 Avoid duplicate warnings where they are used. */
1877 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
1881 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1882 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1883 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1884 decl = IDENTIFIER_GLOBAL_VALUE (name);
1885 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1886 /* Decls in limbo are always extern, so no need to check that. */
1887 decl = IDENTIFIER_LIMBO_VALUE (name);
1891 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1892 /* If old decl is built-in, we already warned if we should. */
1893 && !DECL_BUILT_IN (decl))
1895 pedwarn_with_decl (x,
1896 "type mismatch with previous external decl");
1897 pedwarn_with_decl (decl, "previous external decl of `%s'");
1901 /* If a function has had an implicit declaration, and then is defined,
1902 make sure they are compatible. */
1904 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1905 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1906 && TREE_CODE (x) == FUNCTION_DECL
1907 && ! comptypes (TREE_TYPE (x),
1908 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1910 warning_with_decl (x, "type mismatch with previous implicit declaration");
1911 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1912 "previous implicit declaration of `%s'");
1915 /* In PCC-compatibility mode, extern decls of vars with no current decl
1916 take effect at top level no matter where they are. */
1917 if (flag_traditional && DECL_EXTERNAL (x)
1918 && lookup_name (name) == 0)
1920 tree type = TREE_TYPE (x);
1922 /* But don't do this if the type contains temporary nodes. */
1925 if (type == error_mark_node)
1927 if (! TREE_PERMANENT (type))
1929 warning_with_decl (x, "type of external `%s' is not global");
1930 /* By exiting the loop early, we leave TYPE nonzero,
1931 and thus prevent globalization of the decl. */
1934 else if (TREE_CODE (type) == FUNCTION_TYPE
1935 && TYPE_ARG_TYPES (type) != 0)
1936 /* The types might not be truly local,
1937 but the list of arg types certainly is temporary.
1938 Since prototypes are nontraditional,
1939 ok not to do the traditional thing. */
1941 type = TREE_TYPE (type);
1945 b = global_binding_level;
1948 /* This name is new in its binding level.
1949 Install the new declaration and return it. */
1950 if (b == global_binding_level)
1952 /* Install a global value. */
1954 /* If the first global decl has external linkage,
1955 warn if we later see static one. */
1956 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1957 TREE_PUBLIC (name) = 1;
1959 IDENTIFIER_GLOBAL_VALUE (name) = x;
1961 /* We no longer care about any previous block level declarations. */
1962 IDENTIFIER_LIMBO_VALUE (name) = 0;
1964 /* Don't forget if the function was used via an implicit decl. */
1965 if (IDENTIFIER_IMPLICIT_DECL (name)
1966 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1967 TREE_USED (x) = 1, TREE_USED (name) = 1;
1969 /* Don't forget if its address was taken in that way. */
1970 if (IDENTIFIER_IMPLICIT_DECL (name)
1971 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1972 TREE_ADDRESSABLE (x) = 1;
1974 /* Warn about mismatches against previous implicit decl. */
1975 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1976 /* If this real decl matches the implicit, don't complain. */
1977 && ! (TREE_CODE (x) == FUNCTION_DECL
1978 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1979 == integer_type_node)))
1980 pedwarn ("`%s' was previously implicitly declared to return `int'",
1981 IDENTIFIER_POINTER (name));
1983 /* If this decl is `static' and an `extern' was seen previously,
1984 that is erroneous. */
1985 if (TREE_PUBLIC (name)
1986 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1988 /* Okay to redeclare an ANSI built-in as static. */
1989 if (t != 0 && DECL_BUILT_IN (t))
1991 /* Okay to declare a non-ANSI built-in as anything. */
1992 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1994 else if (IDENTIFIER_IMPLICIT_DECL (name))
1995 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1996 IDENTIFIER_POINTER (name));
1998 pedwarn ("`%s' was declared `extern' and later `static'",
1999 IDENTIFIER_POINTER (name));
2004 /* Here to install a non-global value. */
2005 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2006 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2007 IDENTIFIER_LOCAL_VALUE (name) = x;
2009 /* If this is an extern function declaration, see if we
2010 have a global definition or declaration for the function. */
2012 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2014 && TREE_CODE (x) == FUNCTION_DECL
2015 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2017 /* We have one. Their types must agree. */
2018 if (! comptypes (TREE_TYPE (x),
2019 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2020 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2023 /* Inner extern decl is inline if global one is.
2024 Copy enough to really inline it. */
2025 if (DECL_INLINE (oldglobal))
2027 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2028 DECL_INITIAL (x) = (current_function_decl == oldglobal
2029 ? 0 : DECL_INITIAL (oldglobal));
2030 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2031 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2032 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2033 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2034 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2035 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2037 /* Inner extern decl is built-in if global one is. */
2038 if (DECL_BUILT_IN (oldglobal))
2040 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2041 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
2043 /* Keep the arg types from a file-scope fcn defn. */
2044 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2045 && DECL_INITIAL (oldglobal)
2046 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2047 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2051 #if 0 /* This case is probably sometimes the right thing to do. */
2052 /* If we have a local external declaration,
2053 then any file-scope declaration should not
2054 have been static. */
2055 if (oldlocal == 0 && oldglobal != 0
2056 && !TREE_PUBLIC (oldglobal)
2057 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2058 warning ("`%s' locally external but globally static",
2059 IDENTIFIER_POINTER (name));
2062 /* If we have a local external declaration,
2063 and no file-scope declaration has yet been seen,
2064 then if we later have a file-scope decl it must not be static. */
2067 && DECL_EXTERNAL (x)
2070 TREE_PUBLIC (name) = 1;
2072 /* Save this decl, so that we can do type checking against
2073 other decls after it falls out of scope.
2075 Only save it once. This prevents temporary decls created in
2076 expand_inline_function from being used here, since this
2077 will have been set when the inline function was parsed.
2078 It also helps give slightly better warnings. */
2079 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2080 IDENTIFIER_LIMBO_VALUE (name) = x;
2083 /* Warn if shadowing an argument at the top level of the body. */
2084 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2085 /* This warning doesn't apply to the parms of a nested fcn. */
2086 && ! current_binding_level->parm_flag
2087 /* Check that this is one level down from the parms. */
2088 && current_binding_level->level_chain->parm_flag
2089 /* Check that the decl being shadowed
2090 comes from the parm level, one level up. */
2091 && chain_member (oldlocal, current_binding_level->level_chain->names))
2093 if (TREE_CODE (oldlocal) == PARM_DECL)
2094 pedwarn ("declaration of `%s' shadows a parameter",
2095 IDENTIFIER_POINTER (name));
2097 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2098 IDENTIFIER_POINTER (name));
2101 /* Maybe warn if shadowing something else. */
2102 else if (warn_shadow && !DECL_EXTERNAL (x)
2103 /* No shadow warnings for internally generated vars. */
2104 && DECL_SOURCE_LINE (x) != 0
2105 /* No shadow warnings for vars made for inlining. */
2106 && ! DECL_FROM_INLINE (x))
2108 char *warnstring = 0;
2110 if (TREE_CODE (x) == PARM_DECL
2111 && current_binding_level->level_chain->parm_flag)
2112 /* Don't warn about the parm names in function declarator
2113 within a function declarator.
2114 It would be nice to avoid warning in any function
2115 declarator in a declaration, as opposed to a definition,
2116 but there is no way to tell it's not a definition. */
2118 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2119 warnstring = "declaration of `%s' shadows a parameter";
2120 else if (oldlocal != 0)
2121 warnstring = "declaration of `%s' shadows previous local";
2122 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2123 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2124 warnstring = "declaration of `%s' shadows global declaration";
2127 warning (warnstring, IDENTIFIER_POINTER (name));
2130 /* If storing a local value, there may already be one (inherited).
2131 If so, record it for restoration when this binding level ends. */
2133 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2136 /* Keep count of variables in this level with incomplete type. */
2137 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2141 /* Put decls on list in reverse order.
2142 We will reverse them later if necessary. */
2143 TREE_CHAIN (x) = b->names;
2149 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2152 pushdecl_top_level (x)
2156 register struct binding_level *b = current_binding_level;
2158 current_binding_level = global_binding_level;
2160 current_binding_level = b;
2164 /* Generate an implicit declaration for identifier FUNCTIONID
2165 as a function of type int (). Print a warning if appropriate. */
2168 implicitly_declare (functionid)
2172 int traditional_warning = 0;
2173 /* Only one "implicit declaration" warning per identifier. */
2174 int implicit_warning;
2176 /* Save the decl permanently so we can warn if definition follows. */
2177 push_obstacks_nochange ();
2178 end_temporary_allocation ();
2180 /* We used to reuse an old implicit decl here,
2181 but this loses with inline functions because it can clobber
2182 the saved decl chains. */
2183 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2184 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2186 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2188 /* Warn of implicit decl following explicit local extern decl.
2189 This is probably a program designed for traditional C. */
2190 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2191 traditional_warning = 1;
2193 /* Warn once of an implicit declaration. */
2194 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2196 DECL_EXTERNAL (decl) = 1;
2197 TREE_PUBLIC (decl) = 1;
2199 /* Record that we have an implicit decl and this is it. */
2200 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2202 /* ANSI standard says implicit declarations are in the innermost block.
2203 So we record the decl in the standard fashion.
2204 If flag_traditional is set, pushdecl does it top-level. */
2207 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2208 maybe_objc_check_decl (decl);
2210 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2212 if (warn_implicit && implicit_warning)
2213 warning ("implicit declaration of function `%s'",
2214 IDENTIFIER_POINTER (functionid));
2215 else if (warn_traditional && traditional_warning)
2216 warning ("function `%s' was previously declared within a block",
2217 IDENTIFIER_POINTER (functionid));
2219 /* Write a record describing this implicit function declaration to the
2220 prototypes file (if requested). */
2222 gen_aux_info_record (decl, 0, 1, 0);
2229 /* Return zero if the declaration NEWDECL is valid
2230 when the declaration OLDDECL (assumed to be for the same name)
2231 has already been seen.
2232 Otherwise return an error message format string with a %s
2233 where the identifier should go. */
2236 redeclaration_error_message (newdecl, olddecl)
2237 tree newdecl, olddecl;
2239 if (TREE_CODE (newdecl) == TYPE_DECL)
2241 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2243 return "redefinition of `%s'";
2245 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2247 /* Declarations of functions can insist on internal linkage
2248 but they can't be inconsistent with internal linkage,
2249 so there can be no error on that account.
2250 However defining the same name twice is no good. */
2251 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2252 /* However, defining once as extern inline and a second
2253 time in another way is ok. */
2254 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2255 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2256 return "redefinition of `%s'";
2259 else if (current_binding_level == global_binding_level)
2261 /* Objects declared at top level: */
2262 /* If at least one is a reference, it's ok. */
2263 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2265 /* Reject two definitions. */
2266 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2267 return "redefinition of `%s'";
2268 /* Now we have two tentative defs, or one tentative and one real def. */
2269 /* Insist that the linkage match. */
2270 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2271 return "conflicting declarations of `%s'";
2274 else if (current_binding_level->parm_flag
2275 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2279 /* Objects declared with block scope: */
2280 /* Reject two definitions, and reject a definition
2281 together with an external reference. */
2282 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2283 return "redeclaration of `%s'";
2288 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2289 Create one if none exists so far for the current function.
2290 This function is called for both label definitions and label references. */
2296 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2298 if (current_function_decl == 0)
2300 error ("label %s referenced outside of any function",
2301 IDENTIFIER_POINTER (id));
2305 /* Use a label already defined or ref'd with this name. */
2308 /* But not if it is inherited and wasn't declared to be inheritable. */
2309 if (DECL_CONTEXT (decl) != current_function_decl
2310 && ! C_DECLARED_LABEL_FLAG (decl))
2311 return shadow_label (id);
2315 decl = build_decl (LABEL_DECL, id, void_type_node);
2317 /* Make sure every label has an rtx. */
2320 /* A label not explicitly declared must be local to where it's ref'd. */
2321 DECL_CONTEXT (decl) = current_function_decl;
2323 DECL_MODE (decl) = VOIDmode;
2325 /* Say where one reference is to the label,
2326 for the sake of the error if it is not defined. */
2327 DECL_SOURCE_LINE (decl) = lineno;
2328 DECL_SOURCE_FILE (decl) = input_filename;
2330 IDENTIFIER_LABEL_VALUE (id) = decl;
2332 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2337 /* Make a label named NAME in the current function,
2338 shadowing silently any that may be inherited from containing functions
2339 or containing scopes.
2341 Note that valid use, if the label being shadowed
2342 comes from another scope in the same function,
2343 requires calling declare_nonlocal_label right away. */
2349 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2353 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2354 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2357 return lookup_label (name);
2360 /* Define a label, specifying the location in the source file.
2361 Return the LABEL_DECL node for the label, if the definition is valid.
2362 Otherwise return 0. */
2365 define_label (filename, line, name)
2370 tree decl = lookup_label (name);
2372 /* If label with this name is known from an outer context, shadow it. */
2373 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2375 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2376 IDENTIFIER_LABEL_VALUE (name) = 0;
2377 decl = lookup_label (name);
2380 if (DECL_INITIAL (decl) != 0)
2382 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2387 /* Mark label as having been defined. */
2388 DECL_INITIAL (decl) = error_mark_node;
2389 /* Say where in the source. */
2390 DECL_SOURCE_FILE (decl) = filename;
2391 DECL_SOURCE_LINE (decl) = line;
2396 /* Return the list of declarations of the current level.
2397 Note that this list is in reverse order unless/until
2398 you nreverse it; and when you do nreverse it, you must
2399 store the result back using `storedecls' or you will lose. */
2404 return current_binding_level->names;
2407 /* Return the list of type-tags (for structs, etc) of the current level. */
2412 return current_binding_level->tags;
2415 /* Store the list of declarations of the current level.
2416 This is done for the parameter declarations of a function being defined,
2417 after they are modified in the light of any missing parameters. */
2423 current_binding_level->names = decls;
2426 /* Similarly, store the list of tags of the current level. */
2432 current_binding_level->tags = tags;
2435 /* Given NAME, an IDENTIFIER_NODE,
2436 return the structure (or union or enum) definition for that name.
2437 Searches binding levels from BINDING_LEVEL up to the global level.
2438 If THISLEVEL_ONLY is nonzero, searches only the specified context
2439 (but skips any tag-transparent contexts to find one that is
2440 meaningful for tags).
2441 CODE says which kind of type the caller wants;
2442 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2443 If the wrong kind of type is found, an error is reported. */
2446 lookup_tag (code, name, binding_level, thislevel_only)
2447 enum tree_code code;
2448 struct binding_level *binding_level;
2452 register struct binding_level *level;
2454 for (level = binding_level; level; level = level->level_chain)
2457 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2459 if (TREE_PURPOSE (tail) == name)
2461 if (TREE_CODE (TREE_VALUE (tail)) != code)
2463 /* Definition isn't the kind we were looking for. */
2464 pending_invalid_xref = name;
2465 pending_invalid_xref_file = input_filename;
2466 pending_invalid_xref_line = lineno;
2468 return TREE_VALUE (tail);
2471 if (thislevel_only && ! level->tag_transparent)
2477 /* Print an error message now
2478 for a recent invalid struct, union or enum cross reference.
2479 We don't print them immediately because they are not invalid
2480 when used in the `struct foo;' construct for shadowing. */
2483 pending_xref_error ()
2485 if (pending_invalid_xref != 0)
2486 error_with_file_and_line (pending_invalid_xref_file,
2487 pending_invalid_xref_line,
2488 "`%s' defined as wrong kind of tag",
2489 IDENTIFIER_POINTER (pending_invalid_xref));
2490 pending_invalid_xref = 0;
2493 /* Given a type, find the tag that was defined for it and return the tag name.
2494 Otherwise return 0. */
2497 lookup_tag_reverse (type)
2500 register struct binding_level *level;
2502 for (level = current_binding_level; level; level = level->level_chain)
2505 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2507 if (TREE_VALUE (tail) == type)
2508 return TREE_PURPOSE (tail);
2514 /* Look up NAME in the current binding level and its superiors
2515 in the namespace of variables, functions and typedefs.
2516 Return a ..._DECL node of some kind representing its definition,
2517 or return 0 if it is undefined. */
2524 if (current_binding_level != global_binding_level
2525 && IDENTIFIER_LOCAL_VALUE (name))
2526 val = IDENTIFIER_LOCAL_VALUE (name);
2528 val = IDENTIFIER_GLOBAL_VALUE (name);
2532 /* Similar to `lookup_name' but look only at current binding level. */
2535 lookup_name_current_level (name)
2540 if (current_binding_level == global_binding_level)
2541 return IDENTIFIER_GLOBAL_VALUE (name);
2543 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2546 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2547 if (DECL_NAME (t) == name)
2553 /* Create the predefined scalar types of C,
2554 and some nodes representing standard constants (0, 1, (void *)0).
2555 Initialize the global binding level.
2556 Make definitions for built-in primitive functions. */
2559 init_decl_processing ()
2561 register tree endlink;
2562 /* Either char* or void*. */
2563 tree traditional_ptr_type_node;
2564 /* Data types of memcpy and strlen. */
2565 tree memcpy_ftype, strlen_ftype;
2566 tree void_ftype_any;
2567 int wchar_type_size;
2569 tree array_domain_type;
2571 current_function_decl = NULL;
2572 named_labels = NULL;
2573 current_binding_level = NULL_BINDING_LEVEL;
2574 free_binding_level = NULL_BINDING_LEVEL;
2575 pushlevel (0); /* make the binding_level structure for global names */
2576 global_binding_level = current_binding_level;
2578 /* Define `int' and `char' first so that dbx will output them first. */
2580 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2581 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2582 integer_type_node));
2584 /* Define `char', which is like either `signed char' or `unsigned char'
2585 but not the same as either. */
2589 ? make_signed_type (CHAR_TYPE_SIZE)
2590 : make_unsigned_type (CHAR_TYPE_SIZE));
2591 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2594 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2595 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2596 long_integer_type_node));
2598 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2599 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2600 unsigned_type_node));
2602 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2603 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2604 long_unsigned_type_node));
2606 /* `unsigned long' is the standard type for sizeof.
2607 Traditionally, use a signed type.
2608 Note that stddef.h uses `unsigned long',
2609 and this must agree, even of long and int are the same size. */
2610 if (flag_traditional)
2611 sizetype = long_integer_type_node;
2614 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2617 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2619 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2620 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2621 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2622 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2623 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2625 error_mark_node = make_node (ERROR_MARK);
2626 TREE_TYPE (error_mark_node) = error_mark_node;
2628 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2629 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2630 short_integer_type_node));
2632 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2633 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2634 long_long_integer_type_node));
2636 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2637 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2638 short_unsigned_type_node));
2640 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2641 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2642 long_long_unsigned_type_node));
2644 /* Define both `signed char' and `unsigned char'. */
2645 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2646 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2647 signed_char_type_node));
2649 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2650 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2651 unsigned_char_type_node));
2653 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2654 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2656 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2657 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2659 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2660 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2662 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2663 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2665 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2666 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2668 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2669 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2671 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2672 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2674 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2675 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2677 float_type_node = make_node (REAL_TYPE);
2678 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2679 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2681 layout_type (float_type_node);
2683 double_type_node = make_node (REAL_TYPE);
2684 if (flag_short_double)
2685 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2687 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2688 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2690 layout_type (double_type_node);
2692 long_double_type_node = make_node (REAL_TYPE);
2693 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2694 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2695 long_double_type_node));
2696 layout_type (long_double_type_node);
2698 complex_integer_type_node = make_node (COMPLEX_TYPE);
2699 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2700 complex_integer_type_node));
2701 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2702 layout_type (complex_integer_type_node);
2704 complex_float_type_node = make_node (COMPLEX_TYPE);
2705 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2706 complex_float_type_node));
2707 TREE_TYPE (complex_float_type_node) = float_type_node;
2708 layout_type (complex_float_type_node);
2710 complex_double_type_node = make_node (COMPLEX_TYPE);
2711 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2712 complex_double_type_node));
2713 TREE_TYPE (complex_double_type_node) = double_type_node;
2714 layout_type (complex_double_type_node);
2716 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2717 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2718 complex_long_double_type_node));
2719 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2720 layout_type (complex_long_double_type_node);
2723 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2724 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2725 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2726 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2728 integer_zero_node = build_int_2 (0, 0);
2729 TREE_TYPE (integer_zero_node) = integer_type_node;
2730 integer_one_node = build_int_2 (1, 0);
2731 TREE_TYPE (integer_one_node) = integer_type_node;
2733 size_zero_node = build_int_2 (0, 0);
2734 TREE_TYPE (size_zero_node) = sizetype;
2735 size_one_node = build_int_2 (1, 0);
2736 TREE_TYPE (size_one_node) = sizetype;
2738 void_type_node = make_node (VOID_TYPE);
2739 pushdecl (build_decl (TYPE_DECL,
2740 ridpointers[(int) RID_VOID], void_type_node));
2741 layout_type (void_type_node); /* Uses integer_zero_node */
2742 /* We are not going to have real types in C with less than byte alignment,
2743 so we might as well not have any types that claim to have it. */
2744 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2746 null_pointer_node = build_int_2 (0, 0);
2747 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2748 layout_type (TREE_TYPE (null_pointer_node));
2750 string_type_node = build_pointer_type (char_type_node);
2751 const_string_type_node
2752 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2754 /* Make a type to be the domain of a few array types
2755 whose domains don't really matter.
2756 200 is small enough that it always fits in size_t
2757 and large enough that it can hold most function names for the
2758 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2759 array_domain_type = build_index_type (build_int_2 (200, 0));
2761 /* make a type for arrays of characters.
2762 With luck nothing will ever really depend on the length of this
2764 char_array_type_node
2765 = build_array_type (char_type_node, array_domain_type);
2766 /* Likewise for arrays of ints. */
2768 = build_array_type (integer_type_node, array_domain_type);
2769 /* This is for wide string constants. */
2770 wchar_array_type_node
2771 = build_array_type (wchar_type_node, array_domain_type);
2773 default_function_type
2774 = build_function_type (integer_type_node, NULL_TREE);
2776 ptr_type_node = build_pointer_type (void_type_node);
2778 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2780 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2783 = build_function_type (void_type_node, NULL_TREE);
2786 = build_function_type (double_type_node,
2787 tree_cons (NULL_TREE, double_type_node, endlink));
2789 double_ftype_double_double
2790 = build_function_type (double_type_node,
2791 tree_cons (NULL_TREE, double_type_node,
2792 tree_cons (NULL_TREE,
2793 double_type_node, endlink)));
2796 = build_function_type (integer_type_node,
2797 tree_cons (NULL_TREE, integer_type_node, endlink));
2800 = build_function_type (long_integer_type_node,
2801 tree_cons (NULL_TREE,
2802 long_integer_type_node, endlink));
2804 void_ftype_ptr_ptr_int
2805 = build_function_type (void_type_node,
2806 tree_cons (NULL_TREE, ptr_type_node,
2807 tree_cons (NULL_TREE, ptr_type_node,
2808 tree_cons (NULL_TREE,
2812 int_ftype_cptr_cptr_sizet
2813 = build_function_type (integer_type_node,
2814 tree_cons (NULL_TREE, const_ptr_type_node,
2815 tree_cons (NULL_TREE, const_ptr_type_node,
2816 tree_cons (NULL_TREE,
2820 void_ftype_ptr_int_int
2821 = build_function_type (void_type_node,
2822 tree_cons (NULL_TREE, ptr_type_node,
2823 tree_cons (NULL_TREE, integer_type_node,
2824 tree_cons (NULL_TREE,
2828 string_ftype_ptr_ptr /* strcpy prototype */
2829 = build_function_type (string_type_node,
2830 tree_cons (NULL_TREE, string_type_node,
2831 tree_cons (NULL_TREE,
2832 const_string_type_node,
2835 int_ftype_string_string /* strcmp prototype */
2836 = build_function_type (integer_type_node,
2837 tree_cons (NULL_TREE, const_string_type_node,
2838 tree_cons (NULL_TREE,
2839 const_string_type_node,
2842 strlen_ftype /* strlen prototype */
2843 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2844 tree_cons (NULL_TREE, const_string_type_node,
2847 traditional_ptr_type_node
2848 = (flag_traditional ? string_type_node : ptr_type_node);
2850 memcpy_ftype /* memcpy prototype */
2851 = build_function_type (traditional_ptr_type_node,
2852 tree_cons (NULL_TREE, ptr_type_node,
2853 tree_cons (NULL_TREE, const_ptr_type_node,
2854 tree_cons (NULL_TREE,
2858 builtin_function ("__builtin_constant_p", int_ftype_int,
2859 BUILT_IN_CONSTANT_P, NULL_PTR);
2861 builtin_function ("__builtin_return_address",
2862 build_function_type (ptr_type_node,
2863 tree_cons (NULL_TREE,
2866 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2868 builtin_function ("__builtin_frame_address",
2869 build_function_type (ptr_type_node,
2870 tree_cons (NULL_TREE,
2873 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2875 builtin_function ("__builtin_alloca",
2876 build_function_type (ptr_type_node,
2877 tree_cons (NULL_TREE,
2880 BUILT_IN_ALLOCA, "alloca");
2881 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2882 /* Define alloca, ffs as builtins.
2883 Declare _exit just to mark it as volatile. */
2884 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2886 temp = builtin_function ("alloca",
2887 build_function_type (ptr_type_node,
2888 tree_cons (NULL_TREE,
2891 BUILT_IN_ALLOCA, NULL_PTR);
2892 /* Suppress error if redefined as a non-function. */
2893 DECL_BUILT_IN_NONANSI (temp) = 1;
2894 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2895 /* Suppress error if redefined as a non-function. */
2896 DECL_BUILT_IN_NONANSI (temp) = 1;
2897 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2899 TREE_THIS_VOLATILE (temp) = 1;
2900 TREE_SIDE_EFFECTS (temp) = 1;
2901 /* Suppress error if redefined as a non-function. */
2902 DECL_BUILT_IN_NONANSI (temp) = 1;
2905 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2906 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2908 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2910 builtin_function ("__builtin_saveregs",
2911 build_function_type (ptr_type_node, NULL_TREE),
2912 BUILT_IN_SAVEREGS, NULL_PTR);
2913 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2915 builtin_function ("__builtin_varargs",
2916 build_function_type (ptr_type_node,
2917 tree_cons (NULL_TREE,
2920 BUILT_IN_VARARGS, NULL_PTR);
2922 builtin_function ("__builtin_classify_type", default_function_type,
2923 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2924 builtin_function ("__builtin_next_arg",
2925 build_function_type (ptr_type_node, endlink),
2926 BUILT_IN_NEXT_ARG, NULL_PTR);
2927 builtin_function ("__builtin_args_info",
2928 build_function_type (integer_type_node,
2929 tree_cons (NULL_TREE,
2932 BUILT_IN_ARGS_INFO, NULL_PTR);
2934 /* Untyped call and return. */
2935 builtin_function ("__builtin_apply_args",
2936 build_function_type (ptr_type_node, NULL_TREE),
2937 BUILT_IN_APPLY_ARGS, NULL_PTR);
2939 temp = tree_cons (NULL_TREE,
2940 build_pointer_type (build_function_type (void_type_node,
2942 tree_cons (NULL_TREE,
2944 tree_cons (NULL_TREE,
2947 builtin_function ("__builtin_apply",
2948 build_function_type (ptr_type_node, temp),
2949 BUILT_IN_APPLY, NULL_PTR);
2950 builtin_function ("__builtin_return",
2951 build_function_type (void_type_node,
2952 tree_cons (NULL_TREE,
2955 BUILT_IN_RETURN, NULL_PTR);
2957 /* Currently under experimentation. */
2958 builtin_function ("__builtin_memcpy", memcpy_ftype,
2959 BUILT_IN_MEMCPY, "memcpy");
2960 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2961 BUILT_IN_MEMCMP, "memcmp");
2962 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2963 BUILT_IN_STRCMP, "strcmp");
2964 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2965 BUILT_IN_STRCPY, "strcpy");
2966 builtin_function ("__builtin_strlen", strlen_ftype,
2967 BUILT_IN_STRLEN, "strlen");
2968 builtin_function ("__builtin_fsqrt", double_ftype_double,
2969 BUILT_IN_FSQRT, "sqrt");
2970 builtin_function ("__builtin_sin", double_ftype_double,
2971 BUILT_IN_SIN, "sin");
2972 builtin_function ("__builtin_cos", double_ftype_double,
2973 BUILT_IN_COS, "cos");
2975 /* In an ANSI C program, it is okay to supply built-in meanings
2976 for these functions, since applications cannot validly use them
2977 with any other meaning.
2978 However, honor the -fno-builtin option. */
2979 if (!flag_no_builtin)
2981 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2982 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
2983 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
2984 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
2985 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
2987 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
2989 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
2991 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
2992 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
2993 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
2994 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
2996 /* Declare these functions volatile
2997 to avoid spurious "control drops through" warnings. */
2998 /* Don't specify the argument types, to avoid errors
2999 from certain code which isn't valid in ANSI but which exists. */
3000 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3002 TREE_THIS_VOLATILE (temp) = 1;
3003 TREE_SIDE_EFFECTS (temp) = 1;
3004 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3005 TREE_THIS_VOLATILE (temp) = 1;
3006 TREE_SIDE_EFFECTS (temp) = 1;
3010 /* Support for these has not been written in either expand_builtin
3011 or build_function_call. */
3012 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3013 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3014 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3016 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3018 builtin_function ("__builtin_fmod", double_ftype_double_double,
3019 BUILT_IN_FMOD, NULL_PTR);
3020 builtin_function ("__builtin_frem", double_ftype_double_double,
3021 BUILT_IN_FREM, NULL_PTR);
3022 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3023 BUILT_IN_MEMSET, NULL_PTR);
3024 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3026 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3030 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3031 declare_function_name ();
3033 start_identifier_warnings ();
3035 init_format_info_table ();
3039 incomplete_decl_finalize_hook = finish_incomplete_decl;
3042 /* Return a definition for a builtin function named NAME and whose data type
3043 is TYPE. TYPE should be a function type with argument types.
3044 FUNCTION_CODE tells later passes how to compile calls to this function.
3045 See tree.h for its possible values.
3047 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3048 the name to be called if we can't opencode the function. */
3051 builtin_function (name, type, function_code, library_name)
3054 enum built_in_function function_code;
3057 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3058 DECL_EXTERNAL (decl) = 1;
3059 TREE_PUBLIC (decl) = 1;
3060 /* If -traditional, permit redefining a builtin function any way you like.
3061 (Though really, if the program redefines these functions,
3062 it probably won't work right unless compiled with -fno-builtin.) */
3063 if (flag_traditional && name[0] != '_')
3064 DECL_BUILT_IN_NONANSI (decl) = 1;
3066 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3067 make_decl_rtl (decl, NULL_PTR, 1);
3069 if (function_code != NOT_BUILT_IN)
3071 DECL_BUILT_IN (decl) = 1;
3072 DECL_SET_FUNCTION_CODE (decl, function_code);
3074 /* Warn if a function in the namespace for users
3075 is used without an occasion to consider it declared. */
3076 if (name[0] != '_' || name[1] != '_')
3077 C_DECL_ANTICIPATED (decl) = 1;
3082 /* Called when a declaration is seen that contains no names to declare.
3083 If its type is a reference to a structure, union or enum inherited
3084 from a containing scope, shadow that tag name for the current scope
3085 with a forward reference.
3086 If its type defines a new named structure or union
3087 or defines an enum, it is valid but we need not do anything here.
3088 Otherwise, it is an error. */
3091 shadow_tag (declspecs)
3094 shadow_tag_warned (declspecs, 0);
3098 shadow_tag_warned (declspecs, warned)
3101 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3107 pending_invalid_xref = 0;
3109 for (link = declspecs; link; link = TREE_CHAIN (link))
3111 register tree value = TREE_VALUE (link);
3112 register enum tree_code code = TREE_CODE (value);
3114 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3115 /* Used to test also that TYPE_SIZE (value) != 0.
3116 That caused warning for `struct foo;' at top level in the file. */
3118 register tree name = lookup_tag_reverse (value);
3125 if (warned != 1 && code != ENUMERAL_TYPE)
3126 /* Empty unnamed enum OK */
3128 pedwarn ("unnamed struct/union that defines no instances");
3134 t = lookup_tag (code, name, current_binding_level, 1);
3138 t = make_node (code);
3147 warning ("useless keyword or type name in empty declaration");
3154 error ("two types specified in one empty declaration");
3159 pedwarn ("empty declaration");
3163 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3166 groktypename (typename)
3169 if (TREE_CODE (typename) != TREE_LIST)
3171 return grokdeclarator (TREE_VALUE (typename),
3172 TREE_PURPOSE (typename),
3176 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3179 groktypename_in_parm_context (typename)
3182 if (TREE_CODE (typename) != TREE_LIST)
3184 return grokdeclarator (TREE_VALUE (typename),
3185 TREE_PURPOSE (typename),
3189 /* Decode a declarator in an ordinary declaration or data definition.
3190 This is called as soon as the type information and variable name
3191 have been parsed, before parsing the initializer if any.
3192 Here we create the ..._DECL node, fill in its type,
3193 and put it on the list of decls for the current context.
3194 The ..._DECL node is returned as the value.
3196 Exception: for arrays where the length is not specified,
3197 the type is left null, to be filled in by `finish_decl'.
3199 Function definitions do not come here; they go to start_function
3200 instead. However, external and forward declarations of functions
3201 do go through here. Structure field declarations are done by
3202 grokfield and not through here. */
3204 /* Set this to zero to debug not using the temporary obstack
3205 to parse initializers. */
3206 int debug_temp_inits = 1;
3209 start_decl (declarator, declspecs, initialized)
3210 tree declarator, declspecs;
3213 register tree decl = grokdeclarator (declarator, declspecs,
3214 NORMAL, initialized);
3216 int init_written = initialized;
3218 /* The corresponding pop_obstacks is in finish_decl. */
3219 push_obstacks_nochange ();
3222 /* Is it valid for this decl to have an initializer at all?
3223 If not, set INITIALIZED to zero, which will indirectly
3224 tell `finish_decl' to ignore the initializer once it is parsed. */
3225 switch (TREE_CODE (decl))
3228 /* typedef foo = bar means give foo the same type as bar.
3229 We haven't parsed bar yet, so `finish_decl' will fix that up.
3230 Any other case of an initialization in a TYPE_DECL is an error. */
3231 if (pedantic || list_length (declspecs) > 1)
3233 error ("typedef `%s' is initialized",
3234 IDENTIFIER_POINTER (DECL_NAME (decl)));
3240 error ("function `%s' is initialized like a variable",
3241 IDENTIFIER_POINTER (DECL_NAME (decl)));
3246 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3247 error ("parameter `%s' is initialized",
3248 IDENTIFIER_POINTER (DECL_NAME (decl)));
3253 /* Don't allow initializations for incomplete types
3254 except for arrays which might be completed by the initialization. */
3255 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3257 /* A complete type is ok if size is fixed. */
3259 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3260 || C_DECL_VARIABLE_SIZE (decl))
3262 error ("variable-sized object may not be initialized");
3266 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3268 error ("variable `%s' has initializer but incomplete type",
3269 IDENTIFIER_POINTER (DECL_NAME (decl)));
3272 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3274 error ("elements of array `%s' have incomplete type",
3275 IDENTIFIER_POINTER (DECL_NAME (decl)));
3282 #if 0 /* Seems redundant with grokdeclarator. */
3283 if (current_binding_level != global_binding_level
3284 && DECL_EXTERNAL (decl)
3285 && TREE_CODE (decl) != FUNCTION_DECL)
3286 warning ("declaration of `%s' has `extern' and is initialized",
3287 IDENTIFIER_POINTER (DECL_NAME (decl)));
3289 DECL_EXTERNAL (decl) = 0;
3290 if (current_binding_level == global_binding_level)
3291 TREE_STATIC (decl) = 1;
3293 /* Tell `pushdecl' this is an initialized decl
3294 even though we don't yet have the initializer expression.
3295 Also tell `finish_decl' it may store the real initializer. */
3296 DECL_INITIAL (decl) = error_mark_node;
3299 /* If this is a function declaration, write a record describing it to the
3300 prototypes file (if requested). */
3302 if (TREE_CODE (decl) == FUNCTION_DECL)
3303 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3305 /* Add this decl to the current binding level.
3306 TEM may equal DECL or it may be a previous decl of the same name. */
3307 tem = pushdecl (decl);
3309 /* For a local variable, define the RTL now. */
3310 if (current_binding_level != global_binding_level
3311 /* But not if this is a duplicate decl
3312 and we preserved the rtl from the previous one
3313 (which may or may not happen). */
3314 && DECL_RTL (tem) == 0)
3316 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3318 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3319 && DECL_INITIAL (tem) != 0)
3325 /* When parsing and digesting the initializer,
3326 use temporary storage. Do this even if we will ignore the value. */
3327 if (current_binding_level == global_binding_level && debug_temp_inits)
3328 temporary_allocation ();
3334 /* Finish processing of a declaration;
3335 install its initial value.
3336 If the length of an array type is not known before,
3337 it must be determined now, from the initial value, or it is an error. */
3340 finish_decl (decl, init, asmspec_tree)
3344 register tree type = TREE_TYPE (decl);
3345 int was_incomplete = (DECL_SIZE (decl) == 0);
3346 int temporary = allocation_temporary_p ();
3350 asmspec = TREE_STRING_POINTER (asmspec_tree);
3352 /* If `start_decl' didn't like having an initialization, ignore it now. */
3354 if (init != 0 && DECL_INITIAL (decl) == 0)
3356 /* Don't crash if parm is initialized. */
3357 if (TREE_CODE (decl) == PARM_DECL)
3360 if (ITERATOR_P (decl))
3363 error_with_decl (decl, "iterator has no initial value");
3365 init = save_expr (init);
3370 if (TREE_CODE (decl) != TYPE_DECL)
3371 store_init_value (decl, init);
3374 /* typedef foo = bar; store the type of bar as the type of foo. */
3375 TREE_TYPE (decl) = TREE_TYPE (init);
3376 DECL_INITIAL (decl) = init = 0;
3380 /* Pop back to the obstack that is current for this binding level.
3381 This is because MAXINDEX, rtl, etc. to be made below
3382 must go in the permanent obstack. But don't discard the
3383 temporary data yet. */
3385 #if 0 /* pop_obstacks was near the end; this is what was here. */
3386 if (current_binding_level == global_binding_level && temporary)
3387 end_temporary_allocation ();
3390 /* Deduce size of array from initialization, if not already known */
3392 if (TREE_CODE (type) == ARRAY_TYPE
3393 && TYPE_DOMAIN (type) == 0
3394 && TREE_CODE (decl) != TYPE_DECL)
3397 = (TREE_STATIC (decl)
3398 /* Even if pedantic, an external linkage array
3399 may have incomplete type at first. */
3400 ? pedantic && !TREE_PUBLIC (decl)
3401 : !DECL_EXTERNAL (decl));
3403 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3405 /* Get the completed type made by complete_array_type. */
3406 type = TREE_TYPE (decl);
3409 error_with_decl (decl, "initializer fails to determine size of `%s'");
3414 error_with_decl (decl, "array size missing in `%s'");
3415 /* If a `static' var's size isn't known,
3416 make it extern as well as static, so it does not get
3418 If it is not `static', then do not mark extern;
3419 finish_incomplete_decl will give it a default size
3420 and it will get allocated. */
3421 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3422 DECL_EXTERNAL (decl) = 1;
3425 if (pedantic && TYPE_DOMAIN (type) != 0
3426 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3428 error_with_decl (decl, "zero-size array `%s'");
3430 layout_decl (decl, 0);
3433 if (TREE_CODE (decl) == VAR_DECL)
3435 if (DECL_SIZE (decl) == 0
3436 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3437 layout_decl (decl, 0);
3439 if (DECL_SIZE (decl) == 0
3440 && (TREE_STATIC (decl)
3442 /* A static variable with an incomplete type
3443 is an error if it is initialized or `static'.
3444 Otherwise, let it through, but if it is not `extern'
3445 then it may cause an error message later. */
3446 !TREE_PUBLIC (decl) || DECL_INITIAL (decl)
3448 /* An automatic variable with an incomplete type
3450 !DECL_EXTERNAL (decl)))
3452 error_with_decl (decl, "storage size of `%s' isn't known");
3453 TREE_TYPE (decl) = error_mark_node;
3456 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3457 && DECL_SIZE (decl) != 0)
3459 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3460 constant_expression_warning (DECL_SIZE (decl));
3462 error_with_decl (decl, "storage size of `%s' isn't constant");
3466 /* Output the assembler code and/or RTL code for variables and functions,
3467 unless the type is an undefined structure or union.
3468 If not, it will get done when the type is completed. */
3470 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3472 if (flag_traditional && allocation_temporary_p ())
3474 push_obstacks_nochange ();
3475 end_temporary_allocation ();
3476 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3477 maybe_objc_check_decl (decl);
3478 rest_of_decl_compilation (decl, asmspec,
3479 current_binding_level == global_binding_level,
3485 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3486 maybe_objc_check_decl (decl);
3487 rest_of_decl_compilation (decl, asmspec,
3488 current_binding_level == global_binding_level,
3491 if (current_binding_level != global_binding_level)
3493 /* Recompute the RTL of a local array now
3494 if it used to be an incomplete type. */
3496 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3498 /* If we used it already as memory, it must stay in memory. */
3499 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3500 /* If it's still incomplete now, no init will save it. */
3501 if (DECL_SIZE (decl) == 0)
3502 DECL_INITIAL (decl) = 0;
3505 /* Compute and store the initial value. */
3506 if (TREE_CODE (decl) != FUNCTION_DECL)
3507 expand_decl_init (decl);
3511 if (TREE_CODE (decl) == TYPE_DECL)
3513 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3514 maybe_objc_check_decl (decl);
3515 rest_of_decl_compilation (decl, NULL_PTR,
3516 current_binding_level == global_binding_level,
3520 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3521 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3522 && temporary && TREE_PERMANENT (decl))
3524 /* We need to remember that this array HAD an initialization,
3525 but discard the actual temporary nodes,
3526 since we can't have a permanent node keep pointing to them. */
3527 /* We make an exception for inline functions, since it's
3528 normal for a local extern redeclaration of an inline function
3529 to have a copy of the top-level decl's DECL_INLINE. */
3530 if (DECL_INITIAL (decl) != 0)
3531 DECL_INITIAL (decl) = error_mark_node;
3535 /* Resume permanent allocation, if not within a function. */
3536 /* The corresponding push_obstacks_nochange is in start_decl,
3537 and in push_parm_decl and in grokfield. */
3541 /* If we have gone back from temporary to permanent allocation,
3542 actually free the temporary space that we no longer need. */
3543 if (temporary && !allocation_temporary_p ())
3544 permanent_allocation ();
3546 /* At the end of a declaration, throw away any variable type sizes
3547 of types defined inside that declaration. There is no use
3548 computing them in the following function definition. */
3549 if (current_binding_level == global_binding_level)
3550 get_pending_sizes ();
3553 /* If DECL has a cleanup, build and return that cleanup here.
3554 This is a callback called by expand_expr. */
3557 maybe_build_cleanup (decl)
3560 /* There are no cleanups in C. */
3564 /* Given a parsed parameter declaration,
3565 decode it into a PARM_DECL and push that on the current binding level.
3566 Also, for the sake of forward parm decls,
3567 record the given order of parms in `parm_order'. */
3570 push_parm_decl (parm)
3574 int old_immediate_size_expand = immediate_size_expand;
3575 /* Don't try computing parm sizes now -- wait till fn is called. */
3576 immediate_size_expand = 0;
3578 /* The corresponding pop_obstacks is in finish_decl. */
3579 push_obstacks_nochange ();
3581 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3584 if (DECL_NAME (decl))
3586 olddecl = lookup_name (DECL_NAME (decl));
3587 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3588 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3592 decl = pushdecl (decl);
3594 immediate_size_expand = old_immediate_size_expand;
3596 current_binding_level->parm_order
3597 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3599 /* Add this decl to the current binding level. */
3600 finish_decl (decl, NULL_TREE, NULL_TREE);
3603 /* Clear the given order of parms in `parm_order'.
3604 Used at start of parm list,
3605 and also at semicolon terminating forward decls. */
3610 current_binding_level->parm_order = NULL_TREE;
3613 /* Make TYPE a complete type based on INITIAL_VALUE.
3614 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3615 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3618 complete_array_type (type, initial_value, do_default)
3623 register tree maxindex = NULL_TREE;
3628 /* Note MAXINDEX is really the maximum index,
3629 one less than the size. */
3630 if (TREE_CODE (initial_value) == STRING_CST)
3633 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3634 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3636 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3639 = list_length (CONSTRUCTOR_ELTS (initial_value));
3640 maxindex = build_int_2 (nelts - 1, - (nelts == 0));
3644 /* Make an error message unless that happened already. */
3645 if (initial_value != error_mark_node)
3648 /* Prevent further error messages. */
3649 maxindex = build_int_2 (0, 0);
3656 maxindex = build_int_2 (0, 0);
3662 TYPE_DOMAIN (type) = build_index_type (maxindex);
3663 if (!TREE_TYPE (maxindex))
3664 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3665 #if 0 /* I took out this change
3666 together with the change in build_array_type. --rms */
3667 change_main_variant (type,
3668 build_array_type (TREE_TYPE (type),
3669 TYPE_DOMAIN (type)));
3673 /* Lay out the type now that we can get the real answer. */
3680 /* Given declspecs and a declarator,
3681 determine the name and type of the object declared
3682 and construct a ..._DECL node for it.
3683 (In one case we can return a ..._TYPE node instead.
3684 For invalid input we sometimes return 0.)
3686 DECLSPECS is a chain of tree_list nodes whose value fields
3687 are the storage classes and type specifiers.
3689 DECL_CONTEXT says which syntactic context this declaration is in:
3690 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3691 FUNCDEF for a function definition. Like NORMAL but a few different
3692 error messages in each case. Return value may be zero meaning
3693 this definition is too screwy to try to parse.
3694 PARM for a parameter declaration (either within a function prototype
3695 or before a function body). Make a PARM_DECL, or return void_type_node.
3696 TYPENAME if for a typename (in a cast or sizeof).
3697 Don't make a DECL node; just return the ..._TYPE node.
3698 FIELD for a struct or union field; make a FIELD_DECL.
3699 BITFIELD for a field with specified width.
3700 INITIALIZED is 1 if the decl has an initializer.
3702 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3703 It may also be so in the PARM case, for a prototype where the
3704 argument type is specified but not the name.
3706 This function is where the complicated C meanings of `static'
3707 and `extern' are interpreted. */
3710 grokdeclarator (declarator, declspecs, decl_context, initialized)
3713 enum decl_context decl_context;
3718 tree type = NULL_TREE;
3723 int explicit_int = 0;
3724 int explicit_char = 0;
3725 int defaulted_int = 0;
3726 tree typedef_decl = 0;
3728 tree typedef_type = 0;
3729 int funcdef_flag = 0;
3730 enum tree_code innermost_code = ERROR_MARK;
3732 int size_varies = 0;
3734 if (decl_context == BITFIELD)
3735 bitfield = 1, decl_context = FIELD;
3737 if (decl_context == FUNCDEF)
3738 funcdef_flag = 1, decl_context = NORMAL;
3740 push_obstacks_nochange ();
3742 if (flag_traditional && allocation_temporary_p ())
3743 end_temporary_allocation ();
3745 /* Look inside a declarator for the name being declared
3746 and get it as a string, for an error message. */
3748 register tree decl = declarator;
3752 switch (TREE_CODE (decl))
3757 innermost_code = TREE_CODE (decl);
3758 decl = TREE_OPERAND (decl, 0);
3761 case IDENTIFIER_NODE:
3762 name = IDENTIFIER_POINTER (decl);
3773 /* A function definition's declarator must have the form of
3774 a function declarator. */
3776 if (funcdef_flag && innermost_code != CALL_EXPR)
3779 /* Anything declared one level down from the top level
3780 must be one of the parameters of a function
3781 (because the body is at least two levels down). */
3783 /* If this looks like a function definition, make it one,
3784 even if it occurs where parms are expected.
3785 Then store_parm_decls will reject it and not use it as a parm. */
3786 if (decl_context == NORMAL && !funcdef_flag
3787 && current_binding_level->level_chain == global_binding_level)
3788 decl_context = PARM;
3790 /* Look through the decl specs and record which ones appear.
3791 Some typespecs are defined as built-in typenames.
3792 Others, the ones that are modifiers of other types,
3793 are represented by bits in SPECBITS: set the bits for
3794 the modifiers that appear. Storage class keywords are also in SPECBITS.
3796 If there is a typedef name or a type, store the type in TYPE.
3797 This includes builtin typedefs such as `int'.
3799 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3800 and did not come from a user typedef.
3802 Set LONGLONG if `long' is mentioned twice. */
3804 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3807 register tree id = TREE_VALUE (spec);
3809 if (id == ridpointers[(int) RID_INT])
3811 if (id == ridpointers[(int) RID_CHAR])
3814 if (TREE_CODE (id) == IDENTIFIER_NODE)
3815 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3817 if (ridpointers[i] == id)
3819 if (i == (int) RID_LONG && specbits & (1<<i))
3822 error ("`long long long' is too long for GCC");
3826 pedwarn ("ANSI C does not support `long long'");
3830 else if (specbits & (1 << i))
3831 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3837 error ("two or more data types in declaration of `%s'", name);
3838 /* Actual typedefs come to us as TYPE_DECL nodes. */
3839 else if (TREE_CODE (id) == TYPE_DECL)
3841 type = TREE_TYPE (id);
3844 /* Built-in types come as identifiers. */
3845 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3847 register tree t = lookup_name (id);
3848 if (TREE_TYPE (t) == error_mark_node)
3850 else if (!t || TREE_CODE (t) != TYPE_DECL)
3851 error ("`%s' fails to be a typedef or built in type",
3852 IDENTIFIER_POINTER (id));
3855 type = TREE_TYPE (t);
3859 else if (TREE_CODE (id) != ERROR_MARK)
3865 typedef_type = type;
3867 size_varies = C_TYPE_VARIABLE_SIZE (type);
3869 /* No type at all: default to `int', and set DEFAULTED_INT
3870 because it was not a user-defined typedef. */
3874 if (funcdef_flag && warn_return_type
3875 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3876 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3877 warn_about_return_type = 1;
3879 type = integer_type_node;
3882 /* Now process the modifiers that were specified
3883 and check for invalid combinations. */
3885 /* Long double is a special combination. */
3887 if ((specbits & 1 << (int) RID_LONG)
3888 && TYPE_MAIN_VARIANT (type) == double_type_node)
3890 specbits &= ~ (1 << (int) RID_LONG);
3891 type = long_double_type_node;
3894 /* Check all other uses of type modifiers. */
3896 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3897 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3901 if (TREE_CODE (type) != INTEGER_TYPE)
3902 error ("long, short, signed or unsigned invalid for `%s'", name);
3903 else if ((specbits & 1 << (int) RID_LONG)
3904 && (specbits & 1 << (int) RID_SHORT))
3905 error ("long and short specified together for `%s'", name);
3906 else if (((specbits & 1 << (int) RID_LONG)
3907 || (specbits & 1 << (int) RID_SHORT))
3909 error ("long or short specified with char for `%s'", name);
3910 else if (((specbits & 1 << (int) RID_LONG)
3911 || (specbits & 1 << (int) RID_SHORT))
3912 && TREE_CODE (type) == REAL_TYPE)
3913 error ("long or short specified with floating type for `%s'", name);
3914 else if ((specbits & 1 << (int) RID_SIGNED)
3915 && (specbits & 1 << (int) RID_UNSIGNED))
3916 error ("signed and unsigned given together for `%s'", name);
3920 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
3922 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3924 if (flag_pedantic_errors)
3929 /* Discard the type modifiers if they are invalid. */
3932 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3933 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3938 /* Decide whether an integer type is signed or not.
3939 Optionally treat bitfields as signed by default. */
3940 if (specbits & 1 << (int) RID_UNSIGNED
3941 /* Traditionally, all bitfields are unsigned. */
3942 || (bitfield && flag_traditional
3943 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3944 || (bitfield && ! flag_signed_bitfields
3945 && (explicit_int || defaulted_int || explicit_char
3946 /* A typedef for plain `int' without `signed'
3947 can be controlled just like plain `int'. */
3948 || ! (typedef_decl != 0
3949 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3950 && TREE_CODE (type) != ENUMERAL_TYPE
3951 && !(specbits & 1 << (int) RID_SIGNED)))
3954 type = long_long_unsigned_type_node;
3955 else if (specbits & 1 << (int) RID_LONG)
3956 type = long_unsigned_type_node;
3957 else if (specbits & 1 << (int) RID_SHORT)
3958 type = short_unsigned_type_node;
3959 else if (type == char_type_node)
3960 type = unsigned_char_type_node;
3961 else if (typedef_decl)
3962 type = unsigned_type (type);
3964 type = unsigned_type_node;
3966 else if ((specbits & 1 << (int) RID_SIGNED)
3967 && type == char_type_node)
3968 type = signed_char_type_node;
3970 type = long_long_integer_type_node;
3971 else if (specbits & 1 << (int) RID_LONG)
3972 type = long_integer_type_node;
3973 else if (specbits & 1 << (int) RID_SHORT)
3974 type = short_integer_type_node;
3975 else if (specbits & 1 << (int) RID_COMPLEX)
3978 type = complex_double_type_node;
3979 else if (type == integer_type_node)
3980 type = complex_integer_type_node;
3981 else if (type == float_type_node)
3982 type = complex_float_type_node;
3983 else if (type == double_type_node)
3984 type = complex_double_type_node;
3985 else if (type == long_double_type_node)
3986 type = complex_long_double_type_node;
3988 error ("invalid complex type");
3991 /* Set CONSTP if this declaration is `const', whether by
3992 explicit specification or via a typedef.
3993 Likewise for VOLATILEP. */
3995 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3996 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3997 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3999 pedwarn ("duplicate `const'");
4001 pedwarn ("duplicate `volatile'");
4002 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4003 type = TYPE_MAIN_VARIANT (type);
4005 /* Warn if two storage classes are given. Default to `auto'. */
4010 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4011 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4012 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4013 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4014 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4015 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4017 /* Warn about storage classes that are invalid for certain
4018 kinds of declarations (parameters, typenames, etc.). */
4021 error ("multiple storage classes in declaration of `%s'", name);
4022 else if (funcdef_flag
4024 & ((1 << (int) RID_REGISTER)
4025 | (1 << (int) RID_AUTO)
4026 | (1 << (int) RID_TYPEDEF))))
4028 if (specbits & 1 << (int) RID_AUTO
4029 && (pedantic || current_binding_level == global_binding_level))
4030 pedwarn ("function definition declared `auto'");
4031 if (specbits & 1 << (int) RID_REGISTER)
4032 error ("function definition declared `register'");
4033 if (specbits & 1 << (int) RID_TYPEDEF)
4034 error ("function definition declared `typedef'");
4035 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4036 | (1 << (int) RID_AUTO));
4038 else if (decl_context != NORMAL && nclasses > 0)
4040 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4044 error ((decl_context == FIELD
4045 ? "storage class specified for structure field `%s'"
4046 : (decl_context == PARM
4047 ? "storage class specified for parameter `%s'"
4048 : "storage class specified for typename")),
4050 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4051 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4052 | (1 << (int) RID_EXTERN));
4055 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4057 /* `extern' with initialization is invalid if not at top level. */
4058 if (current_binding_level == global_binding_level)
4059 warning ("`%s' initialized and declared `extern'", name);
4061 error ("`%s' has both `extern' and initializer", name);
4063 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4064 && current_binding_level != global_binding_level)
4065 error ("nested function `%s' declared `extern'", name);
4066 else if (current_binding_level == global_binding_level
4067 && specbits & (1 << (int) RID_AUTO))
4068 error ("top-level declaration of `%s' specifies `auto'", name);
4069 else if ((specbits & 1 << (int) RID_ITERATOR)
4070 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4072 error ("iterator `%s' has derived type", name);
4073 type = error_mark_node;
4075 else if ((specbits & 1 << (int) RID_ITERATOR)
4076 && TREE_CODE (type) != INTEGER_TYPE)
4078 error ("iterator `%s' has noninteger type", name);
4079 type = error_mark_node;
4083 /* Now figure out the structure of the declarator proper.
4084 Descend through it, creating more complex types, until we reach
4085 the declared identifier (or NULL_TREE, in an absolute declarator). */
4087 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4089 if (type == error_mark_node)
4091 declarator = TREE_OPERAND (declarator, 0);
4095 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4096 an INDIRECT_REF (for *...),
4097 a CALL_EXPR (for ...(...)),
4098 an identifier (for the name being declared)
4099 or a null pointer (for the place in an absolute declarator
4100 where the name was omitted).
4101 For the last two cases, we have just exited the loop.
4103 At this point, TYPE is the type of elements of an array,
4104 or for a function to return, or for a pointer to point to.
4105 After this sequence of ifs, TYPE is the type of the
4106 array or function or pointer, and DECLARATOR has had its
4107 outermost layer removed. */
4109 if (TREE_CODE (declarator) == ARRAY_REF)
4111 register tree itype = NULL_TREE;
4112 register tree size = TREE_OPERAND (declarator, 1);
4113 /* An uninitialized decl with `extern' is a reference. */
4114 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4116 declarator = TREE_OPERAND (declarator, 0);
4118 /* Check for some types that there cannot be arrays of. */
4120 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4122 error ("declaration of `%s' as array of voids", name);
4123 type = error_mark_node;
4126 if (TREE_CODE (type) == FUNCTION_TYPE)
4128 error ("declaration of `%s' as array of functions", name);
4129 type = error_mark_node;
4132 if (size == error_mark_node)
4133 type = error_mark_node;
4135 if (type == error_mark_node)
4138 /* If this is a block level extern, it must live past the end
4139 of the function so that we can check it against other extern
4140 declarations (IDENTIFIER_LIMBO_VALUE). */
4141 if (extern_ref && allocation_temporary_p ())
4142 end_temporary_allocation ();
4144 /* If size was specified, set ITYPE to a range-type for that size.
4145 Otherwise, ITYPE remains null. finish_decl may figure it out
4146 from an initial value. */
4150 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4151 STRIP_TYPE_NOPS (size);
4153 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4154 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4156 error ("size of array `%s' has non-integer type", name);
4157 size = integer_one_node;
4159 if (pedantic && integer_zerop (size))
4160 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4161 if (TREE_CODE (size) == INTEGER_CST)
4163 constant_expression_warning (size);
4164 if (INT_CST_LT (size, integer_zero_node))
4166 error ("size of array `%s' is negative", name);
4167 size = integer_one_node;
4169 itype = build_index_type (size_binop (MINUS_EXPR, size,
4176 if (TREE_CONSTANT (size))
4177 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4179 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4181 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
4183 /* Make sure the array size remains visibly nonconstant
4184 even if it is (eg) a const variable with known value. */
4186 itype = variable_size (itype);
4187 itype = build_index_type (itype);
4191 #if 0 /* This had bad results for pointers to arrays, as in
4192 union incomplete (*foo)[4]; */
4193 /* Complain about arrays of incomplete types, except in typedefs. */
4195 if (TYPE_SIZE (type) == 0
4196 /* Avoid multiple warnings for nested array types. */
4197 && TREE_CODE (type) != ARRAY_TYPE
4198 && !(specbits & (1 << (int) RID_TYPEDEF))
4199 && !C_TYPE_BEING_DEFINED (type))
4200 warning ("array type has incomplete element type");
4203 #if 0 /* We shouldn't have a function type here at all!
4204 Functions aren't allowed as array elements. */
4205 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4206 && (constp || volatilep))
4207 pedwarn ("ANSI C forbids const or volatile function types");
4210 /* Build the array type itself, then merge any constancy or
4211 volatility into the target type. We must do it in this order
4212 to ensure that the TYPE_MAIN_VARIANT field of the array type
4213 is set correctly. */
4215 type = build_array_type (type, itype);
4216 if (constp || volatilep)
4217 type = c_build_type_variant (type, constp, volatilep);
4219 #if 0 /* don't clear these; leave them set so that the array type
4220 or the variable is itself const or volatile. */
4226 C_TYPE_VARIABLE_SIZE (type) = 1;
4228 else if (TREE_CODE (declarator) == CALL_EXPR)
4230 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4231 || current_binding_level == global_binding_level);
4234 /* Declaring a function type.
4235 Make sure we have a valid type for the function to return. */
4236 if (type == error_mark_node)
4241 /* Warn about some types functions can't return. */
4243 if (TREE_CODE (type) == FUNCTION_TYPE)
4245 error ("`%s' declared as function returning a function", name);
4246 type = integer_type_node;
4248 if (TREE_CODE (type) == ARRAY_TYPE)
4250 error ("`%s' declared as function returning an array", name);
4251 type = integer_type_node;
4254 #ifndef TRADITIONAL_RETURN_FLOAT
4255 /* Traditionally, declaring return type float means double. */
4257 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4258 type = double_type_node;
4259 #endif /* TRADITIONAL_RETURN_FLOAT */
4261 /* If this is a block level extern, it must live past the end
4262 of the function so that we can check it against other extern
4263 declarations (IDENTIFIER_LIMBO_VALUE). */
4264 if (extern_ref && allocation_temporary_p ())
4265 end_temporary_allocation ();
4267 /* Construct the function type and go to the next
4268 inner layer of declarator. */
4270 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4272 /* Say it's a definition
4273 only for the CALL_EXPR
4274 closest to the identifier. */
4275 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4276 #if 0 /* This seems to be false. We turn off temporary allocation
4277 above in this function if -traditional.
4278 And this code caused inconsistent results with prototypes:
4279 callers would ignore them, and pass arguments wrong. */
4281 /* Omit the arg types if -traditional, since the arg types
4282 and the list links might not be permanent. */
4283 type = build_function_type (type,
4285 ? NULL_TREE : arg_types);
4287 type = build_function_type (type, arg_types);
4288 declarator = TREE_OPERAND (declarator, 0);
4290 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4291 the formal parameter list of this FUNCTION_TYPE to point to
4292 the FUNCTION_TYPE node itself. */
4297 for (link = current_function_parm_tags;
4299 link = TREE_CHAIN (link))
4300 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4303 else if (TREE_CODE (declarator) == INDIRECT_REF)
4305 /* Merge any constancy or volatility into the target type
4308 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4309 && (constp || volatilep))
4310 pedwarn ("ANSI C forbids const or volatile function types");
4311 if (constp || volatilep)
4312 type = c_build_type_variant (type, constp, volatilep);
4317 type = build_pointer_type (type);
4319 /* Process a list of type modifier keywords
4320 (such as const or volatile) that were given inside the `*'. */
4322 if (TREE_TYPE (declarator))
4324 register tree typemodlist;
4326 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4327 typemodlist = TREE_CHAIN (typemodlist))
4329 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4331 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4336 error ("invalid type modifier within pointer declarator");
4340 pedwarn ("duplicate `const'");
4342 pedwarn ("duplicate `volatile'");
4345 declarator = TREE_OPERAND (declarator, 0);
4352 /* Now TYPE has the actual type. */
4354 /* If this is declaring a typedef name, return a TYPE_DECL. */
4356 if (specbits & (1 << (int) RID_TYPEDEF))
4359 /* Note that the grammar rejects storage classes
4360 in typenames, fields or parameters */
4361 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4362 && (constp || volatilep))
4363 pedwarn ("ANSI C forbids const or volatile function types");
4364 if (constp || volatilep)
4365 type = c_build_type_variant (type, constp, volatilep);
4367 decl = build_decl (TYPE_DECL, declarator, type);
4368 if ((specbits & (1 << (int) RID_SIGNED))
4369 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4370 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4374 /* Detect the case of an array type of unspecified size
4375 which came, as such, direct from a typedef name.
4376 We must copy the type, so that each identifier gets
4377 a distinct type, so that each identifier's size can be
4378 controlled separately by its own initializer. */
4380 if (type != 0 && typedef_type != 0
4381 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4382 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4384 type = build_array_type (TREE_TYPE (type), 0);
4386 C_TYPE_VARIABLE_SIZE (type) = 1;
4389 /* If this is a type name (such as, in a cast or sizeof),
4390 compute the type and return it now. */
4392 if (decl_context == TYPENAME)
4394 /* Note that the grammar rejects storage classes
4395 in typenames, fields or parameters */
4396 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4397 && (constp || volatilep))
4398 pedwarn ("ANSI C forbids const or volatile function types");
4399 if (constp || volatilep)
4400 type = c_build_type_variant (type, constp, volatilep);
4405 /* `void' at top level (not within pointer)
4406 is allowed only in typedefs or type names.
4407 We don't complain about parms either, but that is because
4408 a better error message can be made later. */
4410 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM)
4412 error ("variable or field `%s' declared void",
4413 IDENTIFIER_POINTER (declarator));
4414 type = integer_type_node;
4417 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4418 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4423 if (decl_context == PARM)
4425 tree type_as_written = type;
4428 /* A parameter declared as an array of T is really a pointer to T.
4429 One declared as a function is really a pointer to a function. */
4431 if (TREE_CODE (type) == ARRAY_TYPE)
4433 /* Transfer const-ness of array into that of type pointed to. */
4434 type = build_pointer_type
4435 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4436 volatilep = constp = 0;
4439 else if (TREE_CODE (type) == FUNCTION_TYPE)
4441 if (pedantic && (constp || volatilep))
4442 pedwarn ("ANSI C forbids const or volatile function types");
4443 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4444 volatilep = constp = 0;
4447 decl = build_decl (PARM_DECL, declarator, type);
4449 C_DECL_VARIABLE_SIZE (decl) = 1;
4451 /* Compute the type actually passed in the parmlist,
4452 for the case where there is no prototype.
4453 (For example, shorts and chars are passed as ints.)
4454 When there is a prototype, this is overridden later. */
4456 DECL_ARG_TYPE (decl) = type;
4457 main_type = TYPE_MAIN_VARIANT (type);
4458 if (main_type == float_type_node)
4459 DECL_ARG_TYPE (decl) = double_type_node;
4460 /* Don't use TYPE_PRECISION to decide whether to promote,
4461 because we should convert short if it's the same size as int,
4462 but we should not convert long if it's the same size as int. */
4463 else if (C_PROMOTING_INTEGER_TYPE_P (main_type))
4465 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4466 && TREE_UNSIGNED (type))
4467 DECL_ARG_TYPE (decl) = unsigned_type_node;
4469 DECL_ARG_TYPE (decl) = integer_type_node;
4472 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4474 else if (decl_context == FIELD)
4476 /* Structure field. It may not be a function. */
4478 if (TREE_CODE (type) == FUNCTION_TYPE)
4480 error ("field `%s' declared as a function",
4481 IDENTIFIER_POINTER (declarator));
4482 type = build_pointer_type (type);
4484 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4486 error ("field `%s' has incomplete type",
4487 IDENTIFIER_POINTER (declarator));
4488 type = error_mark_node;
4490 /* Move type qualifiers down to element of an array. */
4491 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4493 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4495 TYPE_DOMAIN (type));
4496 #if 0 /* Leave the field const or volatile as well. */
4497 constp = volatilep = 0;
4500 decl = build_decl (FIELD_DECL, declarator, type);
4502 C_DECL_VARIABLE_SIZE (decl) = 1;
4504 else if (TREE_CODE (type) == FUNCTION_TYPE)
4506 /* Every function declaration is "external"
4507 except for those which are inside a function body
4508 in which `auto' is used.
4509 That is a case not specified by ANSI C,
4510 and we use it for forward declarations for nested functions. */
4511 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4512 || current_binding_level == global_binding_level);
4514 if (specbits & (1 << (int) RID_AUTO)
4515 && (pedantic || current_binding_level == global_binding_level))
4516 pedwarn ("invalid storage class for function `%s'",
4517 IDENTIFIER_POINTER (declarator));
4518 if (specbits & (1 << (int) RID_REGISTER))
4519 error ("invalid storage class for function `%s'",
4520 IDENTIFIER_POINTER (declarator));
4521 /* Function declaration not at top level.
4522 Storage classes other than `extern' are not allowed
4523 and `extern' makes no difference. */
4524 if (current_binding_level != global_binding_level
4525 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4527 pedwarn ("invalid storage class for function `%s'",
4528 IDENTIFIER_POINTER (declarator));
4530 /* If this is a block level extern, it must live past the end
4531 of the function so that we can check it against other
4532 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4533 if (extern_ref && allocation_temporary_p ())
4534 end_temporary_allocation ();
4536 decl = build_decl (FUNCTION_DECL, declarator, type);
4538 if (pedantic && (constp || volatilep)
4539 && ! DECL_IN_SYSTEM_HEADER (decl))
4540 pedwarn ("ANSI C forbids const or volatile functions");
4543 DECL_EXTERNAL (decl) = 1;
4544 /* Record absence of global scope for `static' or `auto'. */
4546 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4547 /* Record presence of `inline', if it is reasonable. */
4550 tree last = tree_last (TYPE_ARG_TYPES (type));
4552 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4553 warning ("cannot inline function `main'");
4554 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4556 warning ("inline declaration ignored for function with `...'");
4558 /* Assume that otherwise the function can be inlined. */
4559 DECL_INLINE (decl) = 1;
4561 if (specbits & (1 << (int) RID_EXTERN))
4562 current_extern_inline = 1;
4567 /* It's a variable. */
4568 /* An uninitialized decl with `extern' is a reference. */
4569 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4571 /* Move type qualifiers down to element of an array. */
4572 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4574 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4576 TYPE_DOMAIN (type));
4577 #if 0 /* Leave the variable const or volatile as well. */
4578 constp = volatilep = 0;
4582 /* If this is a block level extern, it must live past the end
4583 of the function so that we can check it against other
4584 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4585 if (extern_ref && allocation_temporary_p ())
4586 end_temporary_allocation ();
4588 decl = build_decl (VAR_DECL, declarator, type);
4590 C_DECL_VARIABLE_SIZE (decl) = 1;
4593 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4595 DECL_EXTERNAL (decl) = extern_ref;
4596 /* At top level, the presence of a `static' or `register' storage
4597 class specifier, or the absence of all storage class specifiers
4598 makes this declaration a definition (perhaps tentative). Also,
4599 the absence of both `static' and `register' makes it public. */
4600 if (current_binding_level == global_binding_level)
4604 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4605 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4607 /* Not at top level, only `static' makes a static definition. */
4610 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4611 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4614 if (specbits & 1 << (int) RID_ITERATOR)
4615 ITERATOR_P (decl) = 1;
4618 /* Record `register' declaration for warnings on &
4619 and in case doing stupid register allocation. */
4621 if (specbits & (1 << (int) RID_REGISTER))
4622 DECL_REGISTER (decl) = 1;
4624 /* Record constancy and volatility. */
4627 TREE_READONLY (decl) = 1;
4630 TREE_SIDE_EFFECTS (decl) = 1;
4631 TREE_THIS_VOLATILE (decl) = 1;
4633 /* If a type has volatile components, it should be stored in memory.
4634 Otherwise, the fact that those components are volatile
4635 will be ignored, and would even crash the compiler. */
4636 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4637 mark_addressable (decl);
4645 /* Decode the parameter-list info for a function type or function definition.
4646 The argument is the value returned by `get_parm_info' (or made in parse.y
4647 if there is an identifier list instead of a parameter decl list).
4648 These two functions are separate because when a function returns
4649 or receives functions then each is called multiple times but the order
4650 of calls is different. The last call to `grokparms' is always the one
4651 that contains the formal parameter names of a function definition.
4653 Store in `last_function_parms' a chain of the decls of parms.
4654 Also store in `last_function_parm_tags' a chain of the struct, union,
4655 and enum tags declared among the parms.
4657 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4659 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4660 a mere declaration. A nonempty identifier-list gets an error message
4661 when FUNCDEF_FLAG is zero. */
4664 grokparms (parms_info, funcdef_flag)
4668 tree first_parm = TREE_CHAIN (parms_info);
4670 last_function_parms = TREE_PURPOSE (parms_info);
4671 last_function_parm_tags = TREE_VALUE (parms_info);
4673 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4674 && !in_system_header)
4675 warning ("function declaration isn't a prototype");
4678 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4681 pedwarn ("parameter names (without types) in function declaration");
4683 last_function_parms = first_parm;
4690 /* We no longer test FUNCDEF_FLAG.
4691 If the arg types are incomplete in a declaration,
4692 they must include undefined tags.
4693 These tags can never be defined in the scope of the declaration,
4694 so the types can never be completed,
4695 and no call can be compiled successfully. */
4697 /* In a fcn definition, arg types must be complete. */
4700 for (parm = last_function_parms, typelt = first_parm;
4702 parm = TREE_CHAIN (parm))
4703 /* Skip over any enumeration constants declared here. */
4704 if (TREE_CODE (parm) == PARM_DECL)
4706 /* Barf if the parameter itself has an incomplete type. */
4707 tree type = TREE_VALUE (typelt);
4708 if (TYPE_SIZE (type) == 0)
4710 if (funcdef_flag && DECL_NAME (parm) != 0)
4711 error ("parameter `%s' has incomplete type",
4712 IDENTIFIER_POINTER (DECL_NAME (parm)));
4714 warning ("parameter has incomplete type");
4717 TREE_VALUE (typelt) = error_mark_node;
4718 TREE_TYPE (parm) = error_mark_node;
4721 #if 0 /* This has been replaced by parm_tags_warning
4722 which uses a more accurate criterion for what to warn about. */
4725 /* Now warn if is a pointer to an incomplete type. */
4726 while (TREE_CODE (type) == POINTER_TYPE
4727 || TREE_CODE (type) == REFERENCE_TYPE)
4728 type = TREE_TYPE (type);
4729 type = TYPE_MAIN_VARIANT (type);
4730 if (TYPE_SIZE (type) == 0)
4732 if (DECL_NAME (parm) != 0)
4733 warning ("parameter `%s' points to incomplete type",
4734 IDENTIFIER_POINTER (DECL_NAME (parm)));
4736 warning ("parameter points to incomplete type");
4740 typelt = TREE_CHAIN (typelt);
4743 /* Allocate the list of types the way we allocate a type. */
4744 if (first_parm && ! TREE_PERMANENT (first_parm))
4746 /* Construct a copy of the list of types
4747 on the saveable obstack. */
4749 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4750 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4752 return nreverse (result);
4755 /* The list we have is permanent already. */
4761 /* Return a tree_list node with info on a parameter list just parsed.
4762 The TREE_PURPOSE is a chain of decls of those parms.
4763 The TREE_VALUE is a list of structure, union and enum tags defined.
4764 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4765 This tree_list node is later fed to `grokparms'.
4767 VOID_AT_END nonzero means append `void' to the end of the type-list.
4768 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4771 get_parm_info (void_at_end)
4774 register tree decl, t;
4775 register tree types = 0;
4777 tree tags = gettags ();
4778 tree parms = getdecls ();
4780 tree order = current_binding_level->parm_order;
4782 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4783 if (void_at_end && parms != 0
4784 && TREE_CHAIN (parms) == 0
4785 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4786 && DECL_NAME (parms) == 0)
4789 storedecls (NULL_TREE);
4790 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4791 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4794 /* Extract enumerator values and other non-parms declared with the parms.
4795 Likewise any forward parm decls that didn't have real parm decls. */
4796 for (decl = parms; decl; )
4798 tree next = TREE_CHAIN (decl);
4800 if (TREE_CODE (decl) != PARM_DECL)
4802 TREE_CHAIN (decl) = new_parms;
4805 else if (TREE_ASM_WRITTEN (decl))
4807 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4808 TREE_CHAIN (decl) = new_parms;
4814 /* Put the parm decls back in the order they were in in the parm list. */
4815 for (t = order; t; t = TREE_CHAIN (t))
4818 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4820 TREE_CHAIN (TREE_VALUE (t)) = 0;
4823 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4826 /* Store the parmlist in the binding level since the old one
4827 is no longer a valid list. (We have changed the chain pointers.) */
4828 storedecls (new_parms);
4830 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4831 /* There may also be declarations for enumerators if an enumeration
4832 type is declared among the parms. Ignore them here. */
4833 if (TREE_CODE (decl) == PARM_DECL)
4835 /* Since there is a prototype,
4836 args are passed in their declared types. */
4837 tree type = TREE_TYPE (decl);
4838 DECL_ARG_TYPE (decl) = type;
4839 #ifdef PROMOTE_PROTOTYPES
4840 if (TREE_CODE (type) == INTEGER_TYPE
4841 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4842 DECL_ARG_TYPE (decl) = integer_type_node;
4845 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4846 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4847 && DECL_NAME (decl) == 0)
4849 error ("`void' in parameter list must be the entire list");
4855 return saveable_tree_cons (new_parms, tags,
4856 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4858 return saveable_tree_cons (new_parms, tags, nreverse (types));
4861 /* At end of parameter list, warn about any struct, union or enum tags
4862 defined within. Do so because these types cannot ever become complete. */
4865 parmlist_tags_warning ()
4870 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4872 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4873 /* An anonymous union parm type is meaningful as a GNU extension.
4874 So don't warn for that. */
4875 if (code == UNION_TYPE && !pedantic)
4877 if (TREE_PURPOSE (elt) != 0)
4878 warning ("`%s %s' declared inside parameter list",
4879 (code == RECORD_TYPE ? "struct"
4880 : code == UNION_TYPE ? "union"
4882 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4884 warning ("anonymous %s declared inside parameter list",
4885 (code == RECORD_TYPE ? "struct"
4886 : code == UNION_TYPE ? "union"
4891 warning ("its scope is only this definition or declaration,");
4892 warning ("which is probably not what you want.");
4898 /* Get the struct, enum or union (CODE says which) with tag NAME.
4899 Define the tag as a forward-reference if it is not defined. */
4902 xref_tag (code, name)
4903 enum tree_code code;
4906 int temporary = allocation_temporary_p ();
4908 /* If a cross reference is requested, look up the type
4909 already defined for this tag and return it. */
4911 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4912 /* Even if this is the wrong type of tag, return what we found.
4913 There will be an error message anyway, from pending_xref_error.
4914 If we create an empty xref just for an invalid use of the type,
4915 the main result is to create lots of superfluous error messages. */
4919 push_obstacks_nochange ();
4921 if (current_binding_level == global_binding_level && temporary)
4922 end_temporary_allocation ();
4924 /* If no such tag is yet defined, create a forward-reference node
4925 and record it as the "definition".
4926 When a real declaration of this type is found,
4927 the forward-reference will be altered into a real type. */
4929 ref = make_node (code);
4930 if (code == ENUMERAL_TYPE)
4932 /* (In ANSI, Enums can be referred to only if already defined.) */
4934 pedwarn ("ANSI C forbids forward references to `enum' types");
4935 /* Give the type a default layout like unsigned int
4936 to avoid crashing if it does not get defined. */
4937 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4938 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4939 TREE_UNSIGNED (ref) = 1;
4940 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4941 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4942 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4945 pushtag (name, ref);
4952 /* Make sure that the tag NAME is defined *in the current binding level*
4953 at least as a forward reference.
4954 CODE says which kind of tag NAME ought to be.
4956 We also do a push_obstacks_nochange
4957 whose matching pop is in finish_struct. */
4960 start_struct (code, name)
4961 enum tree_code code;
4964 /* If there is already a tag defined at this binding level
4965 (as a forward reference), just return it. */
4967 register tree ref = 0;
4969 push_obstacks_nochange ();
4970 if (current_binding_level == global_binding_level)
4971 end_temporary_allocation ();
4974 ref = lookup_tag (code, name, current_binding_level, 1);
4975 if (ref && TREE_CODE (ref) == code)
4977 C_TYPE_BEING_DEFINED (ref) = 1;
4978 if (TYPE_FIELDS (ref))
4979 error ((code == UNION_TYPE ? "redefinition of `union %s'"
4980 : "redefinition of `struct %s'"),
4981 IDENTIFIER_POINTER (name));
4986 /* Otherwise create a forward-reference just so the tag is in scope. */
4988 ref = make_node (code);
4989 pushtag (name, ref);
4990 C_TYPE_BEING_DEFINED (ref) = 1;
4994 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4995 of a structure component, returning a FIELD_DECL node.
4996 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4998 This is done during the parsing of the struct declaration.
4999 The FIELD_DECL nodes are chained together and the lot of them
5000 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5003 grokfield (filename, line, declarator, declspecs, width)
5006 tree declarator, declspecs, width;
5010 /* The corresponding pop_obstacks is in finish_decl. */
5011 push_obstacks_nochange ();
5013 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5015 finish_decl (value, NULL_TREE, NULL_TREE);
5016 DECL_INITIAL (value) = width;
5018 maybe_objc_check_decl (value);
5022 /* Function to help qsort sort FIELD_DECLs by name order. */
5025 field_decl_cmp (x, y)
5028 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
5031 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5032 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5034 We also do a pop_obstacks to match the push in start_struct. */
5037 finish_struct (t, fieldlist)
5038 register tree t, fieldlist;
5042 int toplevel = global_binding_level == current_binding_level;
5044 /* If this type was previously laid out as a forward reference,
5045 make sure we lay it out again. */
5049 /* Nameless union parm types are useful as GCC extension. */
5050 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5051 /* Otherwise, warn about any struct or union def. in parmlist. */
5052 if (in_parm_level_p ())
5055 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5056 : "structure defined inside parms"));
5057 else if (! flag_traditional)
5058 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5059 : "structure defined inside parms"));
5062 old_momentary = suspend_momentary ();
5064 if (fieldlist == 0 && pedantic)
5065 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5066 : "structure has no members"));
5068 /* Install struct as DECL_CONTEXT of each field decl.
5069 Also process specified field sizes.
5070 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5071 The specified size is found in the DECL_INITIAL.
5072 Store 0 there, except for ": 0" fields (so we can find them
5073 and delete them, below). */
5075 for (x = fieldlist; x; x = TREE_CHAIN (x))
5077 DECL_CONTEXT (x) = t;
5078 DECL_FIELD_SIZE (x) = 0;
5080 /* If any field is const, the structure type is pseudo-const. */
5081 if (TREE_READONLY (x))
5082 C_TYPE_FIELDS_READONLY (t) = 1;
5085 /* A field that is pseudo-const makes the structure likewise. */
5086 tree t1 = TREE_TYPE (x);
5087 while (TREE_CODE (t1) == ARRAY_TYPE)
5088 t1 = TREE_TYPE (t1);
5089 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5090 && C_TYPE_FIELDS_READONLY (t1))
5091 C_TYPE_FIELDS_READONLY (t) = 1;
5094 /* Any field that is volatile means variables of this type must be
5095 treated in some ways as volatile. */
5096 if (TREE_THIS_VOLATILE (x))
5097 C_TYPE_FIELDS_VOLATILE (t) = 1;
5099 /* Any field of nominal variable size implies structure is too. */
5100 if (C_DECL_VARIABLE_SIZE (x))
5101 C_TYPE_VARIABLE_SIZE (t) = 1;
5103 /* Detect invalid nested redefinition. */
5104 if (TREE_TYPE (x) == t)
5105 error ("nested redefinition of `%s'",
5106 IDENTIFIER_POINTER (TYPE_NAME (t)));
5108 /* Detect invalid bit-field size. */
5109 if (DECL_INITIAL (x))
5110 STRIP_NOPS (DECL_INITIAL (x));
5111 if (DECL_INITIAL (x))
5113 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5114 constant_expression_warning (DECL_INITIAL (x));
5117 error_with_decl (x, "bit-field `%s' width not an integer constant");
5118 DECL_INITIAL (x) = NULL;
5122 /* Detect invalid bit-field type. */
5123 if (DECL_INITIAL (x)
5124 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5125 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5127 error_with_decl (x, "bit-field `%s' has invalid type");
5128 DECL_INITIAL (x) = NULL;
5130 if (DECL_INITIAL (x) && pedantic
5131 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5132 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node)
5133 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5135 /* Detect and ignore out of range field width. */
5136 if (DECL_INITIAL (x))
5138 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5140 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
5142 DECL_INITIAL (x) = NULL;
5143 error_with_decl (x, "negative width in bit-field `%s'");
5145 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5146 || width > TYPE_PRECISION (TREE_TYPE (x)))
5148 DECL_INITIAL (x) = NULL;
5149 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5151 else if (width == 0 && DECL_NAME (x) != 0)
5153 error_with_decl (x, "zero width for bit-field `%s'");
5154 DECL_INITIAL (x) = NULL;
5158 /* Process valid field width. */
5159 if (DECL_INITIAL (x))
5161 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5163 DECL_FIELD_SIZE (x) = width;
5164 DECL_BIT_FIELD (x) = 1;
5165 DECL_INITIAL (x) = NULL;
5169 /* field size 0 => force desired amount of alignment. */
5170 #ifdef EMPTY_FIELD_BOUNDARY
5171 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5173 #ifdef PCC_BITFIELD_TYPE_MATTERS
5174 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5175 TYPE_ALIGN (TREE_TYPE (x)));
5181 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5182 : TYPE_ALIGN (TREE_TYPE (x)));
5183 /* Non-bit-fields are aligned for their type, except packed
5184 fields which require only BITS_PER_UNIT alignment. */
5185 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5189 /* Now DECL_INITIAL is null on all members. */
5191 /* Delete all duplicate fields from the fieldlist */
5192 for (x = fieldlist; x && TREE_CHAIN (x);)
5193 /* Anonymous fields aren't duplicates. */
5194 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5198 register tree y = fieldlist;
5202 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5208 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5210 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5211 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5213 else x = TREE_CHAIN (x);
5216 /* Now we have the nearly final fieldlist. Record it,
5217 then lay out the structure or union (including the fields). */
5219 TYPE_FIELDS (t) = fieldlist;
5223 /* Delete all zero-width bit-fields from the front of the fieldlist */
5225 && DECL_INITIAL (fieldlist))
5226 fieldlist = TREE_CHAIN (fieldlist);
5227 /* Delete all such members from the rest of the fieldlist */
5228 for (x = fieldlist; x;)
5230 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5231 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5232 else x = TREE_CHAIN (x);
5235 /* Now we have the truly final field list.
5236 Store it in this type and in the variants. */
5238 TYPE_FIELDS (t) = fieldlist;
5240 /* If there are lots of fields, sort so we can look through them fast.
5241 We arbitrarily consider 16 or more elts to be "a lot". */
5245 for (x = fieldlist; x; x = TREE_CHAIN (x))
5256 len += list_length (x);
5257 /* Use the same allocation policy here that make_node uses, to
5258 ensure that this lives as long as the rest of the struct decl.
5259 All decls in an inline function need to be saved. */
5260 if (allocation_temporary_p ())
5261 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5263 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5265 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5266 TYPE_LANG_SPECIFIC (t)->len = len;
5268 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5270 for (x = fieldlist; x; x = TREE_CHAIN (x))
5271 field_array[len++] = x;
5273 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5277 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5279 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5280 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5281 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5284 /* Promote each bit-field's type to int if it is narrower than that. */
5285 for (x = fieldlist; x; x = TREE_CHAIN (x))
5286 if (DECL_BIT_FIELD (x)
5287 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
5288 || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
5290 tree type = TREE_TYPE (x);
5292 /* Preserve unsignedness if traditional
5293 or if not really getting any wider. */
5294 if (TREE_UNSIGNED (type)
5295 && (flag_traditional
5297 (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5299 DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
5300 TREE_TYPE (x) = unsigned_type_node;
5302 TREE_TYPE (x) = integer_type_node;
5305 /* If this structure or union completes the type of any previous
5306 variable declaration, lay it out and output its rtl. */
5308 if (current_binding_level->n_incomplete != 0)
5311 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5313 if (TREE_TYPE (decl) == t
5314 && TREE_CODE (decl) != TYPE_DECL)
5316 layout_decl (decl, 0);
5317 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5318 maybe_objc_check_decl (decl);
5319 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5322 --current_binding_level->n_incomplete;
5324 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5325 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5327 tree element = TREE_TYPE (decl);
5328 while (TREE_CODE (element) == ARRAY_TYPE)
5329 element = TREE_TYPE (element);
5331 layout_array_type (TREE_TYPE (decl));
5336 resume_momentary (old_momentary);
5338 /* Finish debugging output for this type. */
5339 rest_of_type_compilation (t, toplevel);
5341 /* The matching push is in start_struct. */
5347 /* Lay out the type T, and its element type, and so on. */
5350 layout_array_type (t)
5353 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5354 layout_array_type (TREE_TYPE (t));
5358 /* Begin compiling the definition of an enumeration type.
5359 NAME is its name (or null if anonymous).
5360 Returns the type object, as yet incomplete.
5361 Also records info about it so that build_enumerator
5362 may be used to declare the individual values as they are read. */
5368 register tree enumtype = 0;
5370 /* If this is the real definition for a previous forward reference,
5371 fill in the contents in the same object that used to be the
5372 forward reference. */
5375 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5377 /* The corresponding pop_obstacks is in finish_enum. */
5378 push_obstacks_nochange ();
5379 /* If these symbols and types are global, make them permanent. */
5380 if (current_binding_level == global_binding_level)
5381 end_temporary_allocation ();
5383 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5385 enumtype = make_node (ENUMERAL_TYPE);
5386 pushtag (name, enumtype);
5389 C_TYPE_BEING_DEFINED (enumtype) = 1;
5391 if (TYPE_VALUES (enumtype) != 0)
5393 /* This enum is a named one that has been declared already. */
5394 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5396 /* Completely replace its old definition.
5397 The old enumerators remain defined, however. */
5398 TYPE_VALUES (enumtype) = 0;
5401 enum_next_value = integer_zero_node;
5407 /* After processing and defining all the values of an enumeration type,
5408 install their decls in the enumeration type and finish it off.
5409 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5410 Returns ENUMTYPE. */
5413 finish_enum (enumtype, values)
5414 register tree enumtype, values;
5416 register tree pair, tem;
5417 tree minnode = 0, maxnode = 0;
5418 register HOST_WIDE_INT maxvalue = 0;
5419 register HOST_WIDE_INT minvalue = 0;
5421 unsigned precision = 0;
5422 int toplevel = global_binding_level == current_binding_level;
5423 int temporary = allocation_temporary_p ();
5425 if (in_parm_level_p ())
5426 warning ("enum defined inside parms");
5428 /* Calculate the maximum value of any enumerator in this type. */
5430 for (pair = values; pair; pair = TREE_CHAIN (pair))
5432 tree value = TREE_VALUE (pair);
5434 minnode = maxnode = TREE_VALUE (pair);
5437 if (tree_int_cst_lt (maxnode, value))
5439 if (tree_int_cst_lt (value, minnode))
5444 TYPE_MIN_VALUE (enumtype) = minnode;
5445 TYPE_MAX_VALUE (enumtype) = maxnode;
5447 /* Determine the precision this type needs. */
5449 if (TREE_INT_CST_HIGH (minnode) >= 0
5450 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5451 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5452 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5453 precision = TYPE_PRECISION (long_long_integer_type_node);
5456 maxvalue = TREE_INT_CST_LOW (maxnode);
5457 minvalue = TREE_INT_CST_LOW (minnode);
5460 precision = floor_log2 (maxvalue) + 1;
5463 /* Compute number of bits to represent magnitude of a negative value.
5464 Add one to MINVALUE since range of negative numbers
5465 includes the power of two. */
5466 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5467 if (negprecision > precision)
5468 precision = negprecision;
5469 precision += 1; /* room for sign bit */
5476 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5477 /* Use the width of the narrowest normal C type which is wide enough. */
5478 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5480 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5482 TYPE_SIZE (enumtype) = 0;
5483 layout_type (enumtype);
5485 /* An enum can have some negative values; then it is signed. */
5486 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5488 /* If the enumerators might not fit in an int, change their type now. */
5489 /* It seems more useful in the debugger to leave these as int
5490 unless the enumerator is wider than int. */
5491 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5492 for (pair = values; pair; pair = TREE_CHAIN (pair))
5494 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5495 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5496 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5497 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5500 /* Replace the decl nodes in VALUES with their names. */
5501 for (pair = values; pair; pair = TREE_CHAIN (pair))
5502 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5504 TYPE_VALUES (enumtype) = values;
5506 /* Fix up all variant types of this enum type. */
5507 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5509 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5510 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5511 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5512 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5513 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5514 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5515 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5516 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5519 /* Finish debugging output for this type. */
5520 rest_of_type_compilation (enumtype, toplevel);
5522 /* This matches a push in start_enum. */
5528 /* Build and install a CONST_DECL for one value of the
5529 current enumeration type (one that was begun with start_enum).
5530 Return a tree-list containing the CONST_DECL and its value.
5531 Assignment of sequential values by default is handled here. */
5534 build_enumerator (name, value)
5539 /* Validate and default VALUE. */
5541 /* Remove no-op casts from the value. */
5543 STRIP_TYPE_NOPS (value);
5547 if (TREE_CODE (value) == INTEGER_CST)
5548 constant_expression_warning (value);
5551 error ("enumerator value for `%s' not integer constant",
5552 IDENTIFIER_POINTER (name));
5557 /* Default based on previous value. */
5558 /* It should no longer be possible to have NON_LVALUE_EXPR
5562 value = enum_next_value;
5564 error ("overflow in enumeration values");
5567 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5569 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5570 value = integer_zero_node;
5573 /* Set basis for default for next value. */
5574 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5575 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5577 /* Now create a declaration for the enum value name. */
5579 decl = build_decl (CONST_DECL, name, integer_type_node);
5580 DECL_INITIAL (decl) = value;
5581 TREE_TYPE (value) = integer_type_node;
5584 return saveable_tree_cons (decl, value, NULL_TREE);
5587 /* Create the FUNCTION_DECL for a function definition.
5588 DECLSPECS and DECLARATOR are the parts of the declaration;
5589 they describe the function's name and the type it returns,
5590 but twisted together in a fashion that parallels the syntax of C.
5592 This function creates a binding context for the function body
5593 as well as setting up the FUNCTION_DECL in current_function_decl.
5595 Returns 1 on success. If the DECLARATOR is not suitable for a function
5596 (it defines a datum instead), we return 0, which tells
5597 yyparse to report a parse error.
5599 NESTED is nonzero for a function nested within another function. */
5602 start_function (declspecs, declarator, nested)
5603 tree declarator, declspecs;
5606 tree decl1, old_decl;
5609 current_function_returns_value = 0; /* Assume, until we see it does. */
5610 current_function_returns_null = 0;
5611 warn_about_return_type = 0;
5612 current_extern_inline = 0;
5613 c_function_varargs = 0;
5615 shadowed_labels = 0;
5617 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5619 /* If the declarator is not suitable for a function definition,
5620 cause a syntax error. */
5624 announce_function (decl1);
5626 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5628 error ("return-type is an incomplete type");
5629 /* Make it return void instead. */
5631 = build_function_type (void_type_node,
5632 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5635 if (warn_about_return_type)
5636 warning ("return-type defaults to `int'");
5638 /* Save the parm names or decls from this function's declarator
5639 where store_parm_decls will find them. */
5640 current_function_parms = last_function_parms;
5641 current_function_parm_tags = last_function_parm_tags;
5643 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5644 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5645 DECL_INITIAL (decl1) = error_mark_node;
5647 /* If this definition isn't a prototype and we had a prototype declaration
5648 before, copy the arg type info from that prototype.
5649 But not if what we had before was a builtin function. */
5650 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5651 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5652 && !DECL_BUILT_IN (old_decl)
5653 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5654 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5655 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5657 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5658 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5659 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5662 /* Optionally warn of old-fashioned def with no previous prototype. */
5663 if (warn_strict_prototypes
5664 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5665 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5666 warning ("function declaration isn't a prototype");
5667 /* Optionally warn of any global def with no previous prototype. */
5668 else if (warn_missing_prototypes
5669 && TREE_PUBLIC (decl1)
5670 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5671 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5672 warning_with_decl (decl1, "no previous prototype for `%s'");
5673 /* Optionally warn of any def with no previous prototype
5674 if the function has already been used. */
5675 else if (warn_missing_prototypes
5676 && old_decl != 0 && TREE_USED (old_decl)
5677 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5678 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5680 /* This is a definition, not a reference.
5681 So normally clear DECL_EXTERNAL.
5682 However, `extern inline' acts like a declaration
5683 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5684 DECL_EXTERNAL (decl1) = current_extern_inline;
5686 /* This function exists in static storage.
5687 (This does not mean `static' in the C sense!) */
5688 TREE_STATIC (decl1) = 1;
5690 /* A nested function is not global. */
5691 if (current_function_decl != 0)
5692 TREE_PUBLIC (decl1) = 0;
5694 /* Record the decl so that the function name is defined.
5695 If we already have a decl for this name, and it is a FUNCTION_DECL,
5696 use the old decl. */
5698 current_function_decl = pushdecl (decl1);
5701 declare_parm_level (1);
5702 current_binding_level->subblocks_tag_transparent = 1;
5704 make_function_rtl (current_function_decl);
5706 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5707 /* Promote the value to int before returning it. */
5708 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5710 /* It retains unsignedness if traditional
5711 or if not really getting wider. */
5712 if (TREE_UNSIGNED (restype)
5713 && (flag_traditional
5714 || (TYPE_PRECISION (restype)
5715 == TYPE_PRECISION (integer_type_node))))
5716 restype = unsigned_type_node;
5718 restype = integer_type_node;
5720 DECL_RESULT (current_function_decl)
5721 = build_decl (RESULT_DECL, NULL_TREE, restype);
5724 /* Allocate further tree nodes temporarily during compilation
5725 of this function only. */
5726 temporary_allocation ();
5728 /* If this fcn was already referenced via a block-scope `extern' decl
5729 (or an implicit decl), propagate certain information about the usage. */
5730 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5731 TREE_ADDRESSABLE (current_function_decl) = 1;
5736 /* Record that this function is going to be a varargs function.
5737 This is called before store_parm_decls, which is too early
5738 to call mark_varargs directly. */
5743 c_function_varargs = 1;
5746 /* Store the parameter declarations into the current function declaration.
5747 This is called after parsing the parameter declarations, before
5748 digesting the body of the function.
5750 For an old-style definition, modify the function's type
5751 to specify at least the number of arguments. */
5756 register tree fndecl = current_function_decl;
5759 /* This is either a chain of PARM_DECLs (if a prototype was used)
5760 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5761 tree specparms = current_function_parms;
5763 /* This is a list of types declared among parms in a prototype. */
5764 tree parmtags = current_function_parm_tags;
5766 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5767 register tree parmdecls = getdecls ();
5769 /* This is a chain of any other decls that came in among the parm
5770 declarations. If a parm is declared with enum {foo, bar} x;
5771 then CONST_DECLs for foo and bar are put here. */
5774 /* Nonzero if this definition is written with a prototype. */
5777 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5779 /* This case is when the function was defined with an ANSI prototype.
5780 The parms already have decls, so we need not do anything here
5781 except record them as in effect
5782 and complain if any redundant old-style parm decls were written. */
5793 error_with_decl (fndecl,
5794 "parm types given both in parmlist and separately");
5795 /* Get rid of the erroneous decls; don't keep them on
5796 the list of parms, since they might not be PARM_DECLs. */
5797 for (decl = current_binding_level->names;
5798 decl; decl = TREE_CHAIN (decl))
5799 if (DECL_NAME (decl))
5800 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5801 for (link = current_binding_level->shadowed;
5802 link; link = TREE_CHAIN (link))
5803 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5804 current_binding_level->names = 0;
5805 current_binding_level->shadowed = 0;
5808 specparms = nreverse (specparms);
5809 for (parm = specparms; parm; parm = next)
5811 next = TREE_CHAIN (parm);
5812 if (TREE_CODE (parm) == PARM_DECL)
5814 if (DECL_NAME (parm) == 0)
5815 error_with_decl (parm, "parameter name omitted");
5816 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5818 error_with_decl (parm, "parameter `%s' declared void");
5819 /* Change the type to error_mark_node so this parameter
5820 will be ignored by assign_parms. */
5821 TREE_TYPE (parm) = error_mark_node;
5827 /* If we find an enum constant or a type tag,
5828 put it aside for the moment. */
5829 TREE_CHAIN (parm) = 0;
5830 others = chainon (others, parm);
5834 /* Get the decls in their original chain order
5835 and record in the function. */
5836 DECL_ARGUMENTS (fndecl) = getdecls ();
5839 /* If this function takes a variable number of arguments,
5840 add a phony parameter to the end of the parm list,
5841 to represent the position of the first unnamed argument. */
5842 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5845 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5846 /* Let's hope the address of the unnamed parm
5847 won't depend on its type. */
5848 TREE_TYPE (dummy) = integer_type_node;
5849 DECL_ARG_TYPE (dummy) = integer_type_node;
5850 DECL_ARGUMENTS (fndecl)
5851 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5855 /* Now pushdecl the enum constants. */
5856 for (parm = others; parm; parm = next)
5858 next = TREE_CHAIN (parm);
5859 if (DECL_NAME (parm) == 0)
5861 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5863 else if (TREE_CODE (parm) != PARM_DECL)
5867 storetags (chainon (parmtags, gettags ()));
5871 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5872 each with a parm name as the TREE_VALUE.
5874 PARMDECLS is a chain of declarations for parameters.
5875 Warning! It can also contain CONST_DECLs which are not parameters
5876 but are names of enumerators of any enum types
5877 declared among the parameters.
5879 First match each formal parameter name with its declaration.
5880 Associate decls with the names and store the decls
5881 into the TREE_PURPOSE slots. */
5883 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5884 DECL_RESULT (parm) = 0;
5886 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5888 register tree tail, found = NULL;
5890 if (TREE_VALUE (parm) == 0)
5892 error_with_decl (fndecl, "parameter name missing from parameter list");
5893 TREE_PURPOSE (parm) = 0;
5897 /* See if any of the parmdecls specifies this parm by name.
5898 Ignore any enumerator decls. */
5899 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5900 if (DECL_NAME (tail) == TREE_VALUE (parm)
5901 && TREE_CODE (tail) == PARM_DECL)
5907 /* If declaration already marked, we have a duplicate name.
5908 Complain, and don't use this decl twice. */
5909 if (found && DECL_RESULT (found) != 0)
5911 error_with_decl (found, "multiple parameters named `%s'");
5915 /* If the declaration says "void", complain and ignore it. */
5916 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5918 error_with_decl (found, "parameter `%s' declared void");
5919 TREE_TYPE (found) = integer_type_node;
5920 DECL_ARG_TYPE (found) = integer_type_node;
5921 layout_decl (found, 0);
5924 /* Traditionally, a parm declared float is actually a double. */
5925 if (found && flag_traditional
5926 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5928 TREE_TYPE (found) = double_type_node;
5929 DECL_ARG_TYPE (found) = double_type_node;
5930 layout_decl (found, 0);
5933 /* If no declaration found, default to int. */
5936 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5938 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5939 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5940 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5942 warning_with_decl (found, "type of `%s' defaults to `int'");
5946 TREE_PURPOSE (parm) = found;
5948 /* Mark this decl as "already found" -- see test, above.
5949 It is safe to use DECL_RESULT for this
5950 since it is not used in PARM_DECLs or CONST_DECLs. */
5951 DECL_RESULT (found) = error_mark_node;
5954 /* Put anything which is on the parmdecls chain and which is
5955 not a PARM_DECL onto the list NONPARMS. (The types of
5956 non-parm things which might appear on the list include
5957 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5958 any actual PARM_DECLs not matched with any names. */
5961 for (parm = parmdecls; parm; )
5963 tree next = TREE_CHAIN (parm);
5964 TREE_CHAIN (parm) = 0;
5966 if (TREE_CODE (parm) != PARM_DECL)
5967 nonparms = chainon (nonparms, parm);
5970 /* Complain about args with incomplete types. */
5971 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5973 error_with_decl (parm, "parameter `%s' has incomplete type");
5974 TREE_TYPE (parm) = error_mark_node;
5977 if (DECL_RESULT (parm) == 0)
5979 error_with_decl (parm,
5980 "declaration for parameter `%s' but no such parameter");
5981 /* Pretend the parameter was not missing.
5982 This gets us to a standard state and minimizes
5983 further error messages. */
5985 = chainon (specparms,
5986 tree_cons (parm, NULL_TREE, NULL_TREE));
5993 /* Chain the declarations together in the order of the list of names. */
5994 /* Store that chain in the function decl, replacing the list of names. */
5996 DECL_ARGUMENTS (fndecl) = 0;
5999 for (last = 0; parm; parm = TREE_CHAIN (parm))
6000 if (TREE_PURPOSE (parm))
6003 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6005 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6006 last = TREE_PURPOSE (parm);
6007 TREE_CHAIN (last) = 0;
6011 /* If there was a previous prototype,
6012 set the DECL_ARG_TYPE of each argument according to
6013 the type previously specified, and report any mismatches. */
6015 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6018 for (parm = DECL_ARGUMENTS (fndecl),
6019 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6020 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6021 != void_type_node));
6022 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6024 if (parm == 0 || type == 0
6025 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6027 error ("number of arguments doesn't match prototype");
6028 error_with_file_and_line (current_function_prototype_file,
6029 current_function_prototype_line,
6030 "prototype declaration");
6033 /* Type for passing arg must be consistent
6034 with that declared for the arg. */
6035 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6037 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6038 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6040 /* Adjust argument to match prototype. E.g. a previous
6041 `int foo(float);' prototype causes
6042 `int foo(x) float x; {...}' to be treated like
6043 `int foo(float x) {...}'. This is particularly
6044 useful for argument types like uid_t. */
6045 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6046 #ifdef PROMOTE_PROTOTYPES
6047 if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6048 && TYPE_PRECISION (TREE_TYPE (parm))
6049 < TYPE_PRECISION (integer_type_node))
6050 DECL_ARG_TYPE (parm) = integer_type_node;
6054 pedwarn ("promoted argument `%s' doesn't match prototype",
6055 IDENTIFIER_POINTER (DECL_NAME (parm)));
6056 warning_with_file_and_line
6057 (current_function_prototype_file,
6058 current_function_prototype_line,
6059 "prototype declaration");
6062 /* If -traditional, allow `int' argument to match
6063 `unsigned' prototype. */
6064 else if (! (flag_traditional
6065 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6066 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6068 error ("argument `%s' doesn't match prototype",
6069 IDENTIFIER_POINTER (DECL_NAME (parm)));
6070 error_with_file_and_line (current_function_prototype_file,
6071 current_function_prototype_line,
6072 "prototype declaration");
6076 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6079 /* Otherwise, create a prototype that would match. */
6083 register tree actual, type;
6084 register tree last = 0;
6086 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6088 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6091 TREE_CHAIN (last) = type;
6096 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6098 TREE_CHAIN (last) = type;
6102 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6103 of the type of this function, but we need to avoid having this
6104 affect the types of other similarly-typed functions, so we must
6105 first force the generation of an identical (but separate) type
6106 node for the relevant function type. The new node we create
6107 will be a variant of the main variant of the original function
6110 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6112 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6115 /* Now store the final chain of decls for the arguments
6116 as the decl-chain of the current lexical scope.
6117 Put the enumerators in as well, at the front so that
6118 DECL_ARGUMENTS is not modified. */
6120 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6123 /* Make sure the binding level for the top of the function body
6124 gets a BLOCK if there are any in the function.
6125 Otherwise, the dbx output is wrong. */
6127 keep_next_if_subblocks = 1;
6129 /* ??? This might be an improvement,
6130 but needs to be thought about some more. */
6132 keep_next_level_flag = 1;
6135 /* Write a record describing this function definition to the prototypes
6136 file (if requested). */
6138 gen_aux_info_record (fndecl, 1, 0, prototype);
6140 /* Initialize the RTL code for the function. */
6142 init_function_start (fndecl, input_filename, lineno);
6144 /* If this is a varargs function, inform function.c. */
6146 if (c_function_varargs)
6149 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6151 declare_function_name ();
6153 /* Set up parameters and prepare for return, for the function. */
6155 expand_function_start (fndecl, 0);
6157 /* If this function is `main', emit a call to `__main'
6158 to run global initializers, etc. */
6159 if (DECL_NAME (fndecl)
6160 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6161 && DECL_CONTEXT (fndecl) == NULL_TREE)
6162 expand_main_function ();
6165 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6166 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6167 stands for an ellipsis in the identifier list.
6169 PARMLIST is the data returned by get_parm_info for the
6170 parmlist that follows the semicolon.
6172 We return a value of the same sort that get_parm_info returns,
6173 except that it describes the combination of identifiers and parmlist. */
6176 combine_parm_decls (specparms, parmlist, void_at_end)
6177 tree specparms, parmlist;
6180 register tree fndecl = current_function_decl;
6183 tree parmdecls = TREE_PURPOSE (parmlist);
6185 /* This is a chain of any other decls that came in among the parm
6186 declarations. They were separated already by get_parm_info,
6187 so we just need to keep them separate. */
6188 tree nonparms = TREE_VALUE (parmlist);
6192 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6193 DECL_RESULT (parm) = 0;
6195 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6197 register tree tail, found = NULL;
6199 /* See if any of the parmdecls specifies this parm by name. */
6200 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6201 if (DECL_NAME (tail) == TREE_VALUE (parm))
6207 /* If declaration already marked, we have a duplicate name.
6208 Complain, and don't use this decl twice. */
6209 if (found && DECL_RESULT (found) != 0)
6211 error_with_decl (found, "multiple parameters named `%s'");
6215 /* If the declaration says "void", complain and ignore it. */
6216 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6218 error_with_decl (found, "parameter `%s' declared void");
6219 TREE_TYPE (found) = integer_type_node;
6220 DECL_ARG_TYPE (found) = integer_type_node;
6221 layout_decl (found, 0);
6224 /* Traditionally, a parm declared float is actually a double. */
6225 if (found && flag_traditional
6226 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6228 TREE_TYPE (found) = double_type_node;
6229 DECL_ARG_TYPE (found) = double_type_node;
6230 layout_decl (found, 0);
6233 /* If no declaration found, default to int. */
6236 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6238 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6239 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6240 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6241 error_with_decl (found, "type of parameter `%s' is not declared");
6245 TREE_PURPOSE (parm) = found;
6247 /* Mark this decl as "already found" -- see test, above.
6248 It is safe to use DECL_RESULT for this
6249 since it is not used in PARM_DECLs or CONST_DECLs. */
6250 DECL_RESULT (found) = error_mark_node;
6253 /* Complain about any actual PARM_DECLs not matched with any names. */
6255 for (parm = parmdecls; parm; )
6257 tree next = TREE_CHAIN (parm);
6258 TREE_CHAIN (parm) = 0;
6260 /* Complain about args with incomplete types. */
6261 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6263 error_with_decl (parm, "parameter `%s' has incomplete type");
6264 TREE_TYPE (parm) = error_mark_node;
6267 if (DECL_RESULT (parm) == 0)
6269 error_with_decl (parm,
6270 "declaration for parameter `%s' but no such parameter");
6271 /* Pretend the parameter was not missing.
6272 This gets us to a standard state and minimizes
6273 further error messages. */
6275 = chainon (specparms,
6276 tree_cons (parm, NULL_TREE, NULL_TREE));
6282 /* Chain the declarations together in the order of the list of names.
6283 At the same time, build up a list of their types, in reverse order. */
6289 for (last = 0; parm; parm = TREE_CHAIN (parm))
6290 if (TREE_PURPOSE (parm))
6293 parmdecls = TREE_PURPOSE (parm);
6295 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6296 last = TREE_PURPOSE (parm);
6297 TREE_CHAIN (last) = 0;
6299 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6304 return saveable_tree_cons (parmdecls, nonparms,
6305 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6307 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6310 /* Finish up a function declaration and compile that function
6311 all the way to assembler language output. The free the storage
6312 for the function definition.
6314 This is called after parsing the body of the function definition.
6316 NESTED is nonzero if the function being finished is nested in another. */
6319 finish_function (nested)
6322 register tree fndecl = current_function_decl;
6324 /* TREE_READONLY (fndecl) = 1;
6325 This caused &foo to be of type ptr-to-const-function
6326 which then got a warning when stored in a ptr-to-function variable. */
6329 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6331 /* Must mark the RESULT_DECL as being in this function. */
6333 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6335 /* Obey `register' declarations if `setjmp' is called in this fn. */
6336 if (flag_traditional && current_function_calls_setjmp)
6338 setjmp_protect (DECL_INITIAL (fndecl));
6339 setjmp_protect_args ();
6342 #ifdef DEFAULT_MAIN_RETURN
6343 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6345 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6346 != integer_type_node)
6347 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6350 /* Make it so that `main' always returns success by default. */
6351 DEFAULT_MAIN_RETURN;
6356 /* Generate rtl for function exit. */
6357 expand_function_end (input_filename, lineno);
6359 /* So we can tell if jump_optimize sets it to 1. */
6362 /* Run the optimizers and output the assembler code for this function. */
6363 rest_of_compilation (fndecl);
6365 current_function_returns_null |= can_reach_end;
6367 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6368 warning ("`volatile' function does return");
6369 else if (warn_return_type && can_reach_end
6370 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6371 /* If this function returns non-void and control can drop through,
6373 warning ("control reaches end of non-void function");
6374 /* With just -W, complain only if function returns both with
6375 and without a value. */
6376 else if (extra_warnings
6377 && current_function_returns_value && current_function_returns_null)
6378 warning ("this function may return with or without a value");
6380 /* Free all the tree nodes making up this function. */
6381 /* Switch back to allocating nodes permanently
6382 until we start another function. */
6384 permanent_allocation ();
6386 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6388 /* Stop pointing to the local nodes about to be freed. */
6389 /* But DECL_INITIAL must remain nonzero so we know this
6390 was an actual function definition. */
6391 /* For a nested function, this is done in pop_c_function_context. */
6392 DECL_INITIAL (fndecl) = error_mark_node;
6393 DECL_ARGUMENTS (fndecl) = 0;
6398 /* Let the error reporting routines know that we're outside a
6399 function. For a nested function, this value is used in
6400 pop_c_function_context and then reset via pop_function_context. */
6401 current_function_decl = NULL;
6405 /* Save and restore the variables in this file and elsewhere
6406 that keep track of the progress of compilation of the current function.
6407 Used for nested functions. */
6411 struct c_function *next;
6412 tree enum_next_value;
6414 tree shadowed_labels;
6417 int warn_about_return_type;
6419 struct binding_level *binding_level;
6422 struct c_function *c_function_chain;
6424 /* Save and reinitialize the variables
6425 used during compilation of a C function. */
6428 push_c_function_context ()
6430 struct c_function *p
6431 = (struct c_function *) xmalloc (sizeof (struct c_function));
6434 pedwarn ("ANSI C forbids nested functions");
6436 push_function_context ();
6438 p->next = c_function_chain;
6439 c_function_chain = p;
6441 p->enum_next_value = enum_next_value;
6442 p->named_labels = named_labels;
6443 p->shadowed_labels = shadowed_labels;
6444 p->returns_value = current_function_returns_value;
6445 p->returns_null = current_function_returns_null;
6446 p->warn_about_return_type = warn_about_return_type;
6447 p->extern_inline = current_extern_inline;
6448 p->binding_level = current_binding_level;
6451 /* Restore the variables used during compilation of a C function. */
6454 pop_c_function_context ()
6456 struct c_function *p = c_function_chain;
6459 /* Bring back all the labels that were shadowed. */
6460 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6461 if (DECL_NAME (TREE_VALUE (link)) != 0)
6462 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6463 = TREE_VALUE (link);
6465 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6467 /* Stop pointing to the local nodes about to be freed. */
6468 /* But DECL_INITIAL must remain nonzero so we know this
6469 was an actual function definition. */
6470 DECL_INITIAL (current_function_decl) = error_mark_node;
6471 DECL_ARGUMENTS (current_function_decl) = 0;
6474 pop_function_context ();
6476 c_function_chain = p->next;
6478 enum_next_value = p->enum_next_value;
6479 named_labels = p->named_labels;
6480 shadowed_labels = p->shadowed_labels;
6481 current_function_returns_value = p->returns_value;
6482 current_function_returns_null = p->returns_null;
6483 warn_about_return_type = p->warn_about_return_type;
6484 current_extern_inline = p->extern_inline;
6485 current_binding_level = p->binding_level;