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 static 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 ("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;
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_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2032 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2033 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2034 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2036 /* Inner extern decl is built-in if global one is. */
2037 if (DECL_BUILT_IN (oldglobal))
2039 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2040 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
2042 /* Keep the arg types from a file-scope fcn defn. */
2043 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2044 && DECL_INITIAL (oldglobal)
2045 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2046 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2050 #if 0 /* This case is probably sometimes the right thing to do. */
2051 /* If we have a local external declaration,
2052 then any file-scope declaration should not
2053 have been static. */
2054 if (oldlocal == 0 && oldglobal != 0
2055 && !TREE_PUBLIC (oldglobal)
2056 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2057 warning ("`%s' locally external but globally static",
2058 IDENTIFIER_POINTER (name));
2061 /* If we have a local external declaration,
2062 and no file-scope declaration has yet been seen,
2063 then if we later have a file-scope decl it must not be static. */
2066 && DECL_EXTERNAL (x)
2069 TREE_PUBLIC (name) = 1;
2071 /* Save this decl, so that we can do type checking against
2072 other decls after it falls out of scope.
2074 Only save it once. This prevents temporary decls created in
2075 expand_inline_function from being used here, since this
2076 will have been set when the inline function was parsed.
2077 It also helps give slightly better warnings. */
2078 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2079 IDENTIFIER_LIMBO_VALUE (name) = x;
2082 /* Warn if shadowing an argument at the top level of the body. */
2083 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2084 /* This warning doesn't apply to the parms of a nested fcn. */
2085 && ! current_binding_level->parm_flag
2086 /* Check that this is one level down from the parms. */
2087 && current_binding_level->level_chain->parm_flag
2088 /* Check that the decl being shadowed
2089 comes from the parm level, one level up. */
2090 && chain_member (oldlocal, current_binding_level->level_chain->names))
2092 if (TREE_CODE (oldlocal) == PARM_DECL)
2093 pedwarn ("declaration of `%s' shadows a parameter",
2094 IDENTIFIER_POINTER (name));
2096 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2097 IDENTIFIER_POINTER (name));
2100 /* Maybe warn if shadowing something else. */
2101 else if (warn_shadow && !DECL_EXTERNAL (x)
2102 /* No shadow warnings for internally generated vars. */
2103 && DECL_SOURCE_LINE (x) != 0
2104 /* No shadow warnings for vars made for inlining. */
2105 && ! DECL_FROM_INLINE (x))
2107 char *warnstring = 0;
2109 if (TREE_CODE (x) == PARM_DECL
2110 && current_binding_level->level_chain->parm_flag)
2111 /* Don't warn about the parm names in function declarator
2112 within a function declarator.
2113 It would be nice to avoid warning in any function
2114 declarator in a declaration, as opposed to a definition,
2115 but there is no way to tell it's not a definition. */
2117 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2118 warnstring = "declaration of `%s' shadows a parameter";
2119 else if (oldlocal != 0)
2120 warnstring = "declaration of `%s' shadows previous local";
2121 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2122 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2123 warnstring = "declaration of `%s' shadows global declaration";
2126 warning (warnstring, IDENTIFIER_POINTER (name));
2129 /* If storing a local value, there may already be one (inherited).
2130 If so, record it for restoration when this binding level ends. */
2132 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2135 /* Keep count of variables in this level with incomplete type. */
2136 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2140 /* Put decls on list in reverse order.
2141 We will reverse them later if necessary. */
2142 TREE_CHAIN (x) = b->names;
2148 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2151 pushdecl_top_level (x)
2155 register struct binding_level *b = current_binding_level;
2157 current_binding_level = global_binding_level;
2159 current_binding_level = b;
2163 /* Generate an implicit declaration for identifier FUNCTIONID
2164 as a function of type int (). Print a warning if appropriate. */
2167 implicitly_declare (functionid)
2171 int traditional_warning = 0;
2172 /* Only one "implicit declaration" warning per identifier. */
2173 int implicit_warning;
2175 /* Save the decl permanently so we can warn if definition follows. */
2176 push_obstacks_nochange ();
2177 end_temporary_allocation ();
2179 /* We used to reuse an old implicit decl here,
2180 but this loses with inline functions because it can clobber
2181 the saved decl chains. */
2182 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2183 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2185 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2187 /* Warn of implicit decl following explicit local extern decl.
2188 This is probably a program designed for traditional C. */
2189 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2190 traditional_warning = 1;
2192 /* Warn once of an implicit declaration. */
2193 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2195 DECL_EXTERNAL (decl) = 1;
2196 TREE_PUBLIC (decl) = 1;
2198 /* Record that we have an implicit decl and this is it. */
2199 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2201 /* ANSI standard says implicit declarations are in the innermost block.
2202 So we record the decl in the standard fashion.
2203 If flag_traditional is set, pushdecl does it top-level. */
2206 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2207 maybe_objc_check_decl (decl);
2209 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2211 if (warn_implicit && implicit_warning)
2212 warning ("implicit declaration of function `%s'",
2213 IDENTIFIER_POINTER (functionid));
2214 else if (warn_traditional && traditional_warning)
2215 warning ("function `%s' was previously declared within a block",
2216 IDENTIFIER_POINTER (functionid));
2218 /* Write a record describing this implicit function declaration to the
2219 prototypes file (if requested). */
2221 gen_aux_info_record (decl, 0, 1, 0);
2228 /* Return zero if the declaration NEWDECL is valid
2229 when the declaration OLDDECL (assumed to be for the same name)
2230 has already been seen.
2231 Otherwise return an error message format string with a %s
2232 where the identifier should go. */
2235 redeclaration_error_message (newdecl, olddecl)
2236 tree newdecl, olddecl;
2238 if (TREE_CODE (newdecl) == TYPE_DECL)
2240 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2242 return "redefinition of `%s'";
2244 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2246 /* Declarations of functions can insist on internal linkage
2247 but they can't be inconsistent with internal linkage,
2248 so there can be no error on that account.
2249 However defining the same name twice is no good. */
2250 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2251 /* However, defining once as extern inline and a second
2252 time in another way is ok. */
2253 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2254 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2255 return "redefinition of `%s'";
2258 else if (current_binding_level == global_binding_level)
2260 /* Objects declared at top level: */
2261 /* If at least one is a reference, it's ok. */
2262 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2264 /* Reject two definitions. */
2265 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2266 return "redefinition of `%s'";
2267 /* Now we have two tentative defs, or one tentative and one real def. */
2268 /* Insist that the linkage match. */
2269 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2270 return "conflicting declarations of `%s'";
2273 else if (current_binding_level->parm_flag
2274 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2278 /* Objects declared with block scope: */
2279 /* Reject two definitions, and reject a definition
2280 together with an external reference. */
2281 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2282 return "redeclaration of `%s'";
2287 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2288 Create one if none exists so far for the current function.
2289 This function is called for both label definitions and label references. */
2295 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2297 if (current_function_decl == 0)
2299 error ("label %s referenced outside of any function",
2300 IDENTIFIER_POINTER (id));
2304 /* Use a label already defined or ref'd with this name. */
2307 /* But not if it is inherited and wasn't declared to be inheritable. */
2308 if (DECL_CONTEXT (decl) != current_function_decl
2309 && ! C_DECLARED_LABEL_FLAG (decl))
2310 return shadow_label (id);
2314 decl = build_decl (LABEL_DECL, id, void_type_node);
2316 /* Make sure every label has an rtx. */
2319 /* A label not explicitly declared must be local to where it's ref'd. */
2320 DECL_CONTEXT (decl) = current_function_decl;
2322 DECL_MODE (decl) = VOIDmode;
2324 /* Say where one reference is to the label,
2325 for the sake of the error if it is not defined. */
2326 DECL_SOURCE_LINE (decl) = lineno;
2327 DECL_SOURCE_FILE (decl) = input_filename;
2329 IDENTIFIER_LABEL_VALUE (id) = decl;
2331 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2336 /* Make a label named NAME in the current function,
2337 shadowing silently any that may be inherited from containing functions
2338 or containing scopes.
2340 Note that valid use, if the label being shadowed
2341 comes from another scope in the same function,
2342 requires calling declare_nonlocal_label right away. */
2348 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2352 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2353 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2356 return lookup_label (name);
2359 /* Define a label, specifying the location in the source file.
2360 Return the LABEL_DECL node for the label, if the definition is valid.
2361 Otherwise return 0. */
2364 define_label (filename, line, name)
2369 tree decl = lookup_label (name);
2371 /* If label with this name is known from an outer context, shadow it. */
2372 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2374 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2375 IDENTIFIER_LABEL_VALUE (name) = 0;
2376 decl = lookup_label (name);
2379 if (DECL_INITIAL (decl) != 0)
2381 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2386 /* Mark label as having been defined. */
2387 DECL_INITIAL (decl) = error_mark_node;
2388 /* Say where in the source. */
2389 DECL_SOURCE_FILE (decl) = filename;
2390 DECL_SOURCE_LINE (decl) = line;
2395 /* Return the list of declarations of the current level.
2396 Note that this list is in reverse order unless/until
2397 you nreverse it; and when you do nreverse it, you must
2398 store the result back using `storedecls' or you will lose. */
2403 return current_binding_level->names;
2406 /* Return the list of type-tags (for structs, etc) of the current level. */
2411 return current_binding_level->tags;
2414 /* Store the list of declarations of the current level.
2415 This is done for the parameter declarations of a function being defined,
2416 after they are modified in the light of any missing parameters. */
2422 current_binding_level->names = decls;
2425 /* Similarly, store the list of tags of the current level. */
2431 current_binding_level->tags = tags;
2434 /* Given NAME, an IDENTIFIER_NODE,
2435 return the structure (or union or enum) definition for that name.
2436 Searches binding levels from BINDING_LEVEL up to the global level.
2437 If THISLEVEL_ONLY is nonzero, searches only the specified context
2438 (but skips any tag-transparent contexts to find one that is
2439 meaningful for tags).
2440 CODE says which kind of type the caller wants;
2441 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2442 If the wrong kind of type is found, an error is reported. */
2445 lookup_tag (code, name, binding_level, thislevel_only)
2446 enum tree_code code;
2447 struct binding_level *binding_level;
2451 register struct binding_level *level;
2453 for (level = binding_level; level; level = level->level_chain)
2456 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2458 if (TREE_PURPOSE (tail) == name)
2460 if (TREE_CODE (TREE_VALUE (tail)) != code)
2462 /* Definition isn't the kind we were looking for. */
2463 pending_invalid_xref = name;
2464 pending_invalid_xref_file = input_filename;
2465 pending_invalid_xref_line = lineno;
2467 return TREE_VALUE (tail);
2470 if (thislevel_only && ! level->tag_transparent)
2476 /* Print an error message now
2477 for a recent invalid struct, union or enum cross reference.
2478 We don't print them immediately because they are not invalid
2479 when used in the `struct foo;' construct for shadowing. */
2482 pending_xref_error ()
2484 if (pending_invalid_xref != 0)
2485 error_with_file_and_line (pending_invalid_xref_file,
2486 pending_invalid_xref_line,
2487 "`%s' defined as wrong kind of tag",
2488 IDENTIFIER_POINTER (pending_invalid_xref));
2489 pending_invalid_xref = 0;
2492 /* Given a type, find the tag that was defined for it and return the tag name.
2493 Otherwise return 0. */
2496 lookup_tag_reverse (type)
2499 register struct binding_level *level;
2501 for (level = current_binding_level; level; level = level->level_chain)
2504 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2506 if (TREE_VALUE (tail) == type)
2507 return TREE_PURPOSE (tail);
2513 /* Look up NAME in the current binding level and its superiors
2514 in the namespace of variables, functions and typedefs.
2515 Return a ..._DECL node of some kind representing its definition,
2516 or return 0 if it is undefined. */
2523 if (current_binding_level != global_binding_level
2524 && IDENTIFIER_LOCAL_VALUE (name))
2525 val = IDENTIFIER_LOCAL_VALUE (name);
2527 val = IDENTIFIER_GLOBAL_VALUE (name);
2531 /* Similar to `lookup_name' but look only at current binding level. */
2534 lookup_name_current_level (name)
2539 if (current_binding_level == global_binding_level)
2540 return IDENTIFIER_GLOBAL_VALUE (name);
2542 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2545 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2546 if (DECL_NAME (t) == name)
2552 /* Create the predefined scalar types of C,
2553 and some nodes representing standard constants (0, 1, (void *)0).
2554 Initialize the global binding level.
2555 Make definitions for built-in primitive functions. */
2558 init_decl_processing ()
2560 register tree endlink;
2561 /* Either char* or void*. */
2562 tree traditional_ptr_type_node;
2563 /* Data types of memcpy and strlen. */
2564 tree memcpy_ftype, strlen_ftype;
2565 tree void_ftype_any;
2566 int wchar_type_size;
2568 tree array_domain_type;
2570 current_function_decl = NULL;
2571 named_labels = NULL;
2572 current_binding_level = NULL_BINDING_LEVEL;
2573 free_binding_level = NULL_BINDING_LEVEL;
2574 pushlevel (0); /* make the binding_level structure for global names */
2575 global_binding_level = current_binding_level;
2577 /* Define `int' and `char' first so that dbx will output them first. */
2579 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2580 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2581 integer_type_node));
2583 /* Define `char', which is like either `signed char' or `unsigned char'
2584 but not the same as either. */
2588 ? make_signed_type (CHAR_TYPE_SIZE)
2589 : make_unsigned_type (CHAR_TYPE_SIZE));
2590 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2593 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2594 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2595 long_integer_type_node));
2597 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2598 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2599 unsigned_type_node));
2601 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2602 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2603 long_unsigned_type_node));
2605 /* `unsigned long' is the standard type for sizeof.
2606 Traditionally, use a signed type.
2607 Note that stddef.h uses `unsigned long',
2608 and this must agree, even of long and int are the same size. */
2609 if (flag_traditional)
2610 sizetype = long_integer_type_node;
2613 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2616 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2618 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2619 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2620 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2621 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2622 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2624 error_mark_node = make_node (ERROR_MARK);
2625 TREE_TYPE (error_mark_node) = error_mark_node;
2627 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2628 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2629 short_integer_type_node));
2631 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2632 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2633 long_long_integer_type_node));
2635 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2636 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2637 short_unsigned_type_node));
2639 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2640 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2641 long_long_unsigned_type_node));
2643 /* Define both `signed char' and `unsigned char'. */
2644 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2645 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2646 signed_char_type_node));
2648 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2649 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2650 unsigned_char_type_node));
2652 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2653 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2655 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2656 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2658 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2659 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2661 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2662 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2664 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2665 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2667 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2668 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2670 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2671 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2673 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2674 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2676 float_type_node = make_node (REAL_TYPE);
2677 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2678 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2680 layout_type (float_type_node);
2682 double_type_node = make_node (REAL_TYPE);
2683 if (flag_short_double)
2684 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2686 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2687 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2689 layout_type (double_type_node);
2691 long_double_type_node = make_node (REAL_TYPE);
2692 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2693 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2694 long_double_type_node));
2695 layout_type (long_double_type_node);
2697 complex_integer_type_node = make_node (COMPLEX_TYPE);
2698 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2699 complex_integer_type_node));
2700 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2701 layout_type (complex_integer_type_node);
2703 complex_float_type_node = make_node (COMPLEX_TYPE);
2704 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2705 complex_float_type_node));
2706 TREE_TYPE (complex_float_type_node) = float_type_node;
2707 layout_type (complex_float_type_node);
2709 complex_double_type_node = make_node (COMPLEX_TYPE);
2710 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2711 complex_double_type_node));
2712 TREE_TYPE (complex_double_type_node) = double_type_node;
2713 layout_type (complex_double_type_node);
2715 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2716 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2717 complex_long_double_type_node));
2718 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2719 layout_type (complex_long_double_type_node);
2722 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2723 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2724 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2725 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2727 integer_zero_node = build_int_2 (0, 0);
2728 TREE_TYPE (integer_zero_node) = integer_type_node;
2729 integer_one_node = build_int_2 (1, 0);
2730 TREE_TYPE (integer_one_node) = integer_type_node;
2732 size_zero_node = build_int_2 (0, 0);
2733 TREE_TYPE (size_zero_node) = sizetype;
2734 size_one_node = build_int_2 (1, 0);
2735 TREE_TYPE (size_one_node) = sizetype;
2737 void_type_node = make_node (VOID_TYPE);
2738 pushdecl (build_decl (TYPE_DECL,
2739 ridpointers[(int) RID_VOID], void_type_node));
2740 layout_type (void_type_node); /* Uses integer_zero_node */
2741 /* We are not going to have real types in C with less than byte alignment,
2742 so we might as well not have any types that claim to have it. */
2743 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2745 null_pointer_node = build_int_2 (0, 0);
2746 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2747 layout_type (TREE_TYPE (null_pointer_node));
2749 string_type_node = build_pointer_type (char_type_node);
2750 const_string_type_node
2751 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2753 /* Make a type to be the domain of a few array types
2754 whose domains don't really matter.
2755 200 is small enough that it always fits in size_t
2756 and large enough that it can hold most function names for the
2757 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2758 array_domain_type = build_index_type (build_int_2 (200, 0));
2760 /* make a type for arrays of characters.
2761 With luck nothing will ever really depend on the length of this
2763 char_array_type_node
2764 = build_array_type (char_type_node, array_domain_type);
2765 /* Likewise for arrays of ints. */
2767 = build_array_type (integer_type_node, array_domain_type);
2768 /* This is for wide string constants. */
2769 wchar_array_type_node
2770 = build_array_type (wchar_type_node, array_domain_type);
2772 default_function_type
2773 = build_function_type (integer_type_node, NULL_TREE);
2775 ptr_type_node = build_pointer_type (void_type_node);
2777 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2779 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2782 = build_function_type (void_type_node, NULL_TREE);
2785 = build_function_type (double_type_node,
2786 tree_cons (NULL_TREE, double_type_node, endlink));
2788 double_ftype_double_double
2789 = build_function_type (double_type_node,
2790 tree_cons (NULL_TREE, double_type_node,
2791 tree_cons (NULL_TREE,
2792 double_type_node, endlink)));
2795 = build_function_type (integer_type_node,
2796 tree_cons (NULL_TREE, integer_type_node, endlink));
2799 = build_function_type (long_integer_type_node,
2800 tree_cons (NULL_TREE,
2801 long_integer_type_node, endlink));
2803 void_ftype_ptr_ptr_int
2804 = build_function_type (void_type_node,
2805 tree_cons (NULL_TREE, ptr_type_node,
2806 tree_cons (NULL_TREE, ptr_type_node,
2807 tree_cons (NULL_TREE,
2811 int_ftype_cptr_cptr_sizet
2812 = build_function_type (integer_type_node,
2813 tree_cons (NULL_TREE, const_ptr_type_node,
2814 tree_cons (NULL_TREE, const_ptr_type_node,
2815 tree_cons (NULL_TREE,
2819 void_ftype_ptr_int_int
2820 = build_function_type (void_type_node,
2821 tree_cons (NULL_TREE, ptr_type_node,
2822 tree_cons (NULL_TREE, integer_type_node,
2823 tree_cons (NULL_TREE,
2827 string_ftype_ptr_ptr /* strcpy prototype */
2828 = build_function_type (string_type_node,
2829 tree_cons (NULL_TREE, string_type_node,
2830 tree_cons (NULL_TREE,
2831 const_string_type_node,
2834 int_ftype_string_string /* strcmp prototype */
2835 = build_function_type (integer_type_node,
2836 tree_cons (NULL_TREE, const_string_type_node,
2837 tree_cons (NULL_TREE,
2838 const_string_type_node,
2841 strlen_ftype /* strlen prototype */
2842 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2843 tree_cons (NULL_TREE, const_string_type_node,
2846 traditional_ptr_type_node
2847 = (flag_traditional ? string_type_node : ptr_type_node);
2849 memcpy_ftype /* memcpy prototype */
2850 = build_function_type (traditional_ptr_type_node,
2851 tree_cons (NULL_TREE, ptr_type_node,
2852 tree_cons (NULL_TREE, const_ptr_type_node,
2853 tree_cons (NULL_TREE,
2857 builtin_function ("__builtin_constant_p", int_ftype_int,
2858 BUILT_IN_CONSTANT_P, NULL_PTR);
2860 builtin_function ("__builtin_return_address",
2861 build_function_type (ptr_type_node,
2862 tree_cons (NULL_TREE,
2865 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2867 builtin_function ("__builtin_frame_address",
2868 build_function_type (ptr_type_node,
2869 tree_cons (NULL_TREE,
2872 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2874 builtin_function ("__builtin_alloca",
2875 build_function_type (ptr_type_node,
2876 tree_cons (NULL_TREE,
2879 BUILT_IN_ALLOCA, "alloca");
2880 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2881 /* Define alloca, ffs as builtins.
2882 Declare _exit just to mark it as volatile. */
2883 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2885 temp = builtin_function ("alloca",
2886 build_function_type (ptr_type_node,
2887 tree_cons (NULL_TREE,
2890 BUILT_IN_ALLOCA, NULL_PTR);
2891 /* Suppress error if redefined as a non-function. */
2892 DECL_BUILT_IN_NONANSI (temp) = 1;
2893 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2894 /* Suppress error if redefined as a non-function. */
2895 DECL_BUILT_IN_NONANSI (temp) = 1;
2896 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2898 TREE_THIS_VOLATILE (temp) = 1;
2899 TREE_SIDE_EFFECTS (temp) = 1;
2900 /* Suppress error if redefined as a non-function. */
2901 DECL_BUILT_IN_NONANSI (temp) = 1;
2904 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2905 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2907 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2909 builtin_function ("__builtin_saveregs",
2910 build_function_type (ptr_type_node, NULL_TREE),
2911 BUILT_IN_SAVEREGS, NULL_PTR);
2912 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2914 builtin_function ("__builtin_varargs",
2915 build_function_type (ptr_type_node,
2916 tree_cons (NULL_TREE,
2919 BUILT_IN_VARARGS, NULL_PTR);
2921 builtin_function ("__builtin_classify_type", default_function_type,
2922 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2923 builtin_function ("__builtin_next_arg",
2924 build_function_type (ptr_type_node, endlink),
2925 BUILT_IN_NEXT_ARG, NULL_PTR);
2926 builtin_function ("__builtin_args_info",
2927 build_function_type (integer_type_node,
2928 tree_cons (NULL_TREE,
2931 BUILT_IN_ARGS_INFO, NULL_PTR);
2933 /* Untyped call and return. */
2934 builtin_function ("__builtin_apply_args",
2935 build_function_type (ptr_type_node, NULL_TREE),
2936 BUILT_IN_APPLY_ARGS, NULL_PTR);
2938 temp = tree_cons (NULL_TREE,
2939 build_pointer_type (build_function_type (void_type_node,
2941 tree_cons (NULL_TREE,
2943 tree_cons (NULL_TREE,
2946 builtin_function ("__builtin_apply",
2947 build_function_type (ptr_type_node, temp),
2948 BUILT_IN_APPLY, NULL_PTR);
2949 builtin_function ("__builtin_return",
2950 build_function_type (void_type_node,
2951 tree_cons (NULL_TREE,
2954 BUILT_IN_RETURN, NULL_PTR);
2956 /* Currently under experimentation. */
2957 builtin_function ("__builtin_memcpy", memcpy_ftype,
2958 BUILT_IN_MEMCPY, "memcpy");
2959 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2960 BUILT_IN_MEMCMP, "memcmp");
2961 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2962 BUILT_IN_STRCMP, "strcmp");
2963 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2964 BUILT_IN_STRCPY, "strcpy");
2965 builtin_function ("__builtin_strlen", strlen_ftype,
2966 BUILT_IN_STRLEN, "strlen");
2967 builtin_function ("__builtin_fsqrt", double_ftype_double,
2968 BUILT_IN_FSQRT, "sqrt");
2969 builtin_function ("__builtin_sin", double_ftype_double,
2970 BUILT_IN_SIN, "sin");
2971 builtin_function ("__builtin_cos", double_ftype_double,
2972 BUILT_IN_COS, "cos");
2974 /* In an ANSI C program, it is okay to supply built-in meanings
2975 for these functions, since applications cannot validly use them
2976 with any other meaning.
2977 However, honor the -fno-builtin option. */
2978 if (!flag_no_builtin)
2980 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2981 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
2982 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
2983 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
2984 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
2986 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
2988 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
2990 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
2991 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
2992 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
2993 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
2995 /* Declare these functions volatile
2996 to avoid spurious "control drops through" warnings. */
2997 /* Don't specify the argument types, to avoid errors
2998 from certain code which isn't valid in ANSI but which exists. */
2999 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3001 TREE_THIS_VOLATILE (temp) = 1;
3002 TREE_SIDE_EFFECTS (temp) = 1;
3003 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3004 TREE_THIS_VOLATILE (temp) = 1;
3005 TREE_SIDE_EFFECTS (temp) = 1;
3009 /* Support for these has not been written in either expand_builtin
3010 or build_function_call. */
3011 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3012 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3013 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3015 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3017 builtin_function ("__builtin_fmod", double_ftype_double_double,
3018 BUILT_IN_FMOD, NULL_PTR);
3019 builtin_function ("__builtin_frem", double_ftype_double_double,
3020 BUILT_IN_FREM, NULL_PTR);
3021 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3022 BUILT_IN_MEMSET, NULL_PTR);
3023 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3025 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3029 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3030 declare_function_name ();
3032 start_identifier_warnings ();
3034 init_format_info_table ();
3038 incomplete_decl_finalize_hook = finish_incomplete_decl;
3041 /* Return a definition for a builtin function named NAME and whose data type
3042 is TYPE. TYPE should be a function type with argument types.
3043 FUNCTION_CODE tells later passes how to compile calls to this function.
3044 See tree.h for its possible values.
3046 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3047 the name to be called if we can't opencode the function. */
3050 builtin_function (name, type, function_code, library_name)
3053 enum built_in_function function_code;
3056 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3057 DECL_EXTERNAL (decl) = 1;
3058 TREE_PUBLIC (decl) = 1;
3059 /* If -traditional, permit redefining a builtin function any way you like.
3060 (Though really, if the program redefines these functions,
3061 it probably won't work right unless compiled with -fno-builtin.) */
3062 if (flag_traditional && name[0] != '_')
3063 DECL_BUILT_IN_NONANSI (decl) = 1;
3065 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3066 make_decl_rtl (decl, NULL_PTR, 1);
3068 if (function_code != NOT_BUILT_IN)
3070 DECL_BUILT_IN (decl) = 1;
3071 DECL_SET_FUNCTION_CODE (decl, function_code);
3073 /* Warn if a function in the namespace for users
3074 is used without an occasion to consider it declared. */
3075 if (name[0] != '_' || name[1] != '_')
3076 C_DECL_ANTICIPATED (decl) = 1;
3081 /* Called when a declaration is seen that contains no names to declare.
3082 If its type is a reference to a structure, union or enum inherited
3083 from a containing scope, shadow that tag name for the current scope
3084 with a forward reference.
3085 If its type defines a new named structure or union
3086 or defines an enum, it is valid but we need not do anything here.
3087 Otherwise, it is an error. */
3090 shadow_tag (declspecs)
3093 shadow_tag_warned (declspecs, 0);
3097 shadow_tag_warned (declspecs, warned)
3104 pending_invalid_xref = 0;
3106 for (link = declspecs; link; link = TREE_CHAIN (link))
3108 register tree value = TREE_VALUE (link);
3109 register enum tree_code code = TREE_CODE (value);
3111 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3112 /* Used to test also that TYPE_SIZE (value) != 0.
3113 That caused warning for `struct foo;' at top level in the file. */
3115 register tree name = lookup_tag_reverse (value);
3122 if (!warned && code != ENUMERAL_TYPE) /* Empty unnamed enum OK */
3124 pedwarn ("unnamed struct/union that defines no instances");
3130 t = lookup_tag (code, name, current_binding_level, 1);
3134 t = make_node (code);
3142 pedwarn ("useless keyword or type name in empty declaration");
3150 error ("two types specified in one empty declaration");
3152 pedwarn ("empty declaration");
3156 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3159 groktypename (typename)
3162 if (TREE_CODE (typename) != TREE_LIST)
3164 return grokdeclarator (TREE_VALUE (typename),
3165 TREE_PURPOSE (typename),
3169 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3172 groktypename_in_parm_context (typename)
3175 if (TREE_CODE (typename) != TREE_LIST)
3177 return grokdeclarator (TREE_VALUE (typename),
3178 TREE_PURPOSE (typename),
3182 /* Decode a declarator in an ordinary declaration or data definition.
3183 This is called as soon as the type information and variable name
3184 have been parsed, before parsing the initializer if any.
3185 Here we create the ..._DECL node, fill in its type,
3186 and put it on the list of decls for the current context.
3187 The ..._DECL node is returned as the value.
3189 Exception: for arrays where the length is not specified,
3190 the type is left null, to be filled in by `finish_decl'.
3192 Function definitions do not come here; they go to start_function
3193 instead. However, external and forward declarations of functions
3194 do go through here. Structure field declarations are done by
3195 grokfield and not through here. */
3197 /* Set this to zero to debug not using the temporary obstack
3198 to parse initializers. */
3199 int debug_temp_inits = 1;
3202 start_decl (declarator, declspecs, initialized)
3203 tree declarator, declspecs;
3206 register tree decl = grokdeclarator (declarator, declspecs,
3207 NORMAL, initialized);
3209 int init_written = initialized;
3211 /* The corresponding pop_obstacks is in finish_decl. */
3212 push_obstacks_nochange ();
3215 /* Is it valid for this decl to have an initializer at all?
3216 If not, set INITIALIZED to zero, which will indirectly
3217 tell `finish_decl' to ignore the initializer once it is parsed. */
3218 switch (TREE_CODE (decl))
3221 /* typedef foo = bar means give foo the same type as bar.
3222 We haven't parsed bar yet, so `finish_decl' will fix that up.
3223 Any other case of an initialization in a TYPE_DECL is an error. */
3224 if (pedantic || list_length (declspecs) > 1)
3226 error ("typedef `%s' is initialized",
3227 IDENTIFIER_POINTER (DECL_NAME (decl)));
3233 error ("function `%s' is initialized like a variable",
3234 IDENTIFIER_POINTER (DECL_NAME (decl)));
3239 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3240 error ("parameter `%s' is initialized",
3241 IDENTIFIER_POINTER (DECL_NAME (decl)));
3246 /* Don't allow initializations for incomplete types
3247 except for arrays which might be completed by the initialization. */
3248 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3250 /* A complete type is ok if size is fixed. */
3252 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3253 || C_DECL_VARIABLE_SIZE (decl))
3255 error ("variable-sized object may not be initialized");
3259 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3261 error ("variable `%s' has initializer but incomplete type",
3262 IDENTIFIER_POINTER (DECL_NAME (decl)));
3265 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3267 error ("elements of array `%s' have incomplete type",
3268 IDENTIFIER_POINTER (DECL_NAME (decl)));
3275 #if 0 /* Seems redundant with grokdeclarator. */
3276 if (current_binding_level != global_binding_level
3277 && DECL_EXTERNAL (decl)
3278 && TREE_CODE (decl) != FUNCTION_DECL)
3279 warning ("declaration of `%s' has `extern' and is initialized",
3280 IDENTIFIER_POINTER (DECL_NAME (decl)));
3282 DECL_EXTERNAL (decl) = 0;
3283 if (current_binding_level == global_binding_level)
3284 TREE_STATIC (decl) = 1;
3286 /* Tell `pushdecl' this is an initialized decl
3287 even though we don't yet have the initializer expression.
3288 Also tell `finish_decl' it may store the real initializer. */
3289 DECL_INITIAL (decl) = error_mark_node;
3292 /* If this is a function declaration, write a record describing it to the
3293 prototypes file (if requested). */
3295 if (TREE_CODE (decl) == FUNCTION_DECL)
3296 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3298 /* Add this decl to the current binding level.
3299 TEM may equal DECL or it may be a previous decl of the same name. */
3300 tem = pushdecl (decl);
3302 /* For a local variable, define the RTL now. */
3303 if (current_binding_level != global_binding_level
3304 /* But not if this is a duplicate decl
3305 and we preserved the rtl from the previous one
3306 (which may or may not happen). */
3307 && DECL_RTL (tem) == 0)
3309 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3311 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3312 && DECL_INITIAL (tem) != 0)
3318 /* When parsing and digesting the initializer,
3319 use temporary storage. Do this even if we will ignore the value. */
3320 if (current_binding_level == global_binding_level && debug_temp_inits)
3321 temporary_allocation ();
3327 /* Finish processing of a declaration;
3328 install its initial value.
3329 If the length of an array type is not known before,
3330 it must be determined now, from the initial value, or it is an error. */
3333 finish_decl (decl, init, asmspec_tree)
3337 register tree type = TREE_TYPE (decl);
3338 int was_incomplete = (DECL_SIZE (decl) == 0);
3339 int temporary = allocation_temporary_p ();
3343 asmspec = TREE_STRING_POINTER (asmspec_tree);
3345 /* If `start_decl' didn't like having an initialization, ignore it now. */
3347 if (init != 0 && DECL_INITIAL (decl) == 0)
3349 /* Don't crash if parm is initialized. */
3350 if (TREE_CODE (decl) == PARM_DECL)
3353 if (ITERATOR_P (decl))
3356 error_with_decl (decl, "iterator has no initial value");
3358 init = save_expr (init);
3363 if (TREE_CODE (decl) != TYPE_DECL)
3364 store_init_value (decl, init);
3367 /* typedef foo = bar; store the type of bar as the type of foo. */
3368 TREE_TYPE (decl) = TREE_TYPE (init);
3369 DECL_INITIAL (decl) = init = 0;
3373 /* Pop back to the obstack that is current for this binding level.
3374 This is because MAXINDEX, rtl, etc. to be made below
3375 must go in the permanent obstack. But don't discard the
3376 temporary data yet. */
3378 #if 0 /* pop_obstacks was near the end; this is what was here. */
3379 if (current_binding_level == global_binding_level && temporary)
3380 end_temporary_allocation ();
3383 /* Deduce size of array from initialization, if not already known */
3385 if (TREE_CODE (type) == ARRAY_TYPE
3386 && TYPE_DOMAIN (type) == 0
3387 && TREE_CODE (decl) != TYPE_DECL)
3390 = (TREE_STATIC (decl)
3391 /* Even if pedantic, an external linkage array
3392 may have incomplete type at first. */
3393 ? pedantic && !TREE_PUBLIC (decl)
3394 : !DECL_EXTERNAL (decl));
3396 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3398 /* Get the completed type made by complete_array_type. */
3399 type = TREE_TYPE (decl);
3402 error_with_decl (decl, "initializer fails to determine size of `%s'");
3407 error_with_decl (decl, "array size missing in `%s'");
3408 /* If a `static' var's size isn't known,
3409 make it extern as well as static, so it does not get
3411 If it is not `static', then do not mark extern;
3412 finish_incomplete_decl will give it a default size
3413 and it will get allocated. */
3414 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3415 DECL_EXTERNAL (decl) = 1;
3418 if (pedantic && TYPE_DOMAIN (type) != 0
3419 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3421 error_with_decl (decl, "zero-size array `%s'");
3423 layout_decl (decl, 0);
3426 if (TREE_CODE (decl) == VAR_DECL)
3428 if (DECL_SIZE (decl) == 0
3429 && (TREE_STATIC (decl)
3431 /* A static variable with an incomplete type
3432 is an error if it is initialized or `static'.
3433 Otherwise, let it through, but if it is not `extern'
3434 then it may cause an error message later. */
3435 !TREE_PUBLIC (decl) || DECL_INITIAL (decl)
3437 /* An automatic variable with an incomplete type
3439 !DECL_EXTERNAL (decl)))
3441 error_with_decl (decl, "storage size of `%s' isn't known");
3442 TREE_TYPE (decl) = error_mark_node;
3445 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3446 && DECL_SIZE (decl) != 0)
3448 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3449 constant_expression_warning (DECL_SIZE (decl));
3451 error_with_decl (decl, "storage size of `%s' isn't constant");
3455 /* Output the assembler code and/or RTL code for variables and functions,
3456 unless the type is an undefined structure or union.
3457 If not, it will get done when the type is completed. */
3459 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3461 if (flag_traditional && allocation_temporary_p ())
3463 push_obstacks_nochange ();
3464 end_temporary_allocation ();
3465 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3466 maybe_objc_check_decl (decl);
3467 rest_of_decl_compilation (decl, asmspec,
3468 current_binding_level == global_binding_level,
3474 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3475 maybe_objc_check_decl (decl);
3476 rest_of_decl_compilation (decl, asmspec,
3477 current_binding_level == global_binding_level,
3480 if (current_binding_level != global_binding_level)
3482 /* Recompute the RTL of a local array now
3483 if it used to be an incomplete type. */
3485 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3487 /* If we used it already as memory, it must stay in memory. */
3488 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3489 /* If it's still incomplete now, no init will save it. */
3490 if (DECL_SIZE (decl) == 0)
3491 DECL_INITIAL (decl) = 0;
3494 /* Compute and store the initial value. */
3495 if (TREE_CODE (decl) != FUNCTION_DECL)
3496 expand_decl_init (decl);
3500 if (TREE_CODE (decl) == TYPE_DECL)
3502 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3503 maybe_objc_check_decl (decl);
3504 rest_of_decl_compilation (decl, NULL_PTR,
3505 current_binding_level == global_binding_level,
3509 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3510 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3511 && temporary && TREE_PERMANENT (decl))
3513 /* We need to remember that this array HAD an initialization,
3514 but discard the actual temporary nodes,
3515 since we can't have a permanent node keep pointing to them. */
3516 /* We make an exception for inline functions, since it's
3517 normal for a local extern redeclaration of an inline function
3518 to have a copy of the top-level decl's DECL_INLINE. */
3519 if (DECL_INITIAL (decl) != 0)
3520 DECL_INITIAL (decl) = error_mark_node;
3524 /* Resume permanent allocation, if not within a function. */
3525 /* The corresponding push_obstacks_nochange is in start_decl,
3526 and in push_parm_decl and in grokfield. */
3530 /* If we have gone back from temporary to permanent allocation,
3531 actually free the temporary space that we no longer need. */
3532 if (temporary && !allocation_temporary_p ())
3533 permanent_allocation ();
3535 /* At the end of a declaration, throw away any variable type sizes
3536 of types defined inside that declaration. There is no use
3537 computing them in the following function definition. */
3538 if (current_binding_level == global_binding_level)
3539 get_pending_sizes ();
3542 /* If DECL has a cleanup, build and return that cleanup here.
3543 This is a callback called by expand_expr. */
3546 maybe_build_cleanup (decl)
3549 /* There are no cleanups in C. */
3553 /* Given a parsed parameter declaration,
3554 decode it into a PARM_DECL and push that on the current binding level.
3555 Also, for the sake of forward parm decls,
3556 record the given order of parms in `parm_order'. */
3559 push_parm_decl (parm)
3563 int old_immediate_size_expand = immediate_size_expand;
3564 /* Don't try computing parm sizes now -- wait till fn is called. */
3565 immediate_size_expand = 0;
3567 /* The corresponding pop_obstacks is in finish_decl. */
3568 push_obstacks_nochange ();
3570 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3571 if (DECL_NAME (decl))
3573 olddecl = lookup_name (DECL_NAME (decl));
3574 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3575 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3577 decl = pushdecl (decl);
3579 immediate_size_expand = old_immediate_size_expand;
3581 current_binding_level->parm_order
3582 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3584 /* Add this decl to the current binding level. */
3585 finish_decl (decl, NULL_TREE, NULL_TREE);
3588 /* Clear the given order of parms in `parm_order'.
3589 Used at start of parm list,
3590 and also at semicolon terminating forward decls. */
3595 current_binding_level->parm_order = NULL_TREE;
3598 /* Make TYPE a complete type based on INITIAL_VALUE.
3599 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3600 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3603 complete_array_type (type, initial_value, do_default)
3608 register tree maxindex = NULL_TREE;
3613 /* Note MAXINDEX is really the maximum index,
3614 one less than the size. */
3615 if (TREE_CODE (initial_value) == STRING_CST)
3618 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3619 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3621 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3624 = list_length (CONSTRUCTOR_ELTS (initial_value));
3625 maxindex = build_int_2 (nelts - 1, 0);
3629 /* Make an error message unless that happened already. */
3630 if (initial_value != error_mark_node)
3633 /* Prevent further error messages. */
3634 maxindex = build_int_2 (0, 0);
3641 maxindex = build_int_2 (0, 0);
3647 TYPE_DOMAIN (type) = build_index_type (maxindex);
3648 if (!TREE_TYPE (maxindex))
3649 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3652 /* Lay out the type now that we can get the real answer. */
3659 /* Given declspecs and a declarator,
3660 determine the name and type of the object declared
3661 and construct a ..._DECL node for it.
3662 (In one case we can return a ..._TYPE node instead.
3663 For invalid input we sometimes return 0.)
3665 DECLSPECS is a chain of tree_list nodes whose value fields
3666 are the storage classes and type specifiers.
3668 DECL_CONTEXT says which syntactic context this declaration is in:
3669 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3670 FUNCDEF for a function definition. Like NORMAL but a few different
3671 error messages in each case. Return value may be zero meaning
3672 this definition is too screwy to try to parse.
3673 PARM for a parameter declaration (either within a function prototype
3674 or before a function body). Make a PARM_DECL, or return void_type_node.
3675 TYPENAME if for a typename (in a cast or sizeof).
3676 Don't make a DECL node; just return the ..._TYPE node.
3677 FIELD for a struct or union field; make a FIELD_DECL.
3678 BITFIELD for a field with specified width.
3679 INITIALIZED is 1 if the decl has an initializer.
3681 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3682 It may also be so in the PARM case, for a prototype where the
3683 argument type is specified but not the name.
3685 This function is where the complicated C meanings of `static'
3686 and `extern' are interpreted. */
3689 grokdeclarator (declarator, declspecs, decl_context, initialized)
3692 enum decl_context decl_context;
3697 tree type = NULL_TREE;
3702 int explicit_int = 0;
3703 int explicit_char = 0;
3704 int defaulted_int = 0;
3705 tree typedef_decl = 0;
3707 tree typedef_type = 0;
3708 int funcdef_flag = 0;
3709 enum tree_code innermost_code = ERROR_MARK;
3711 int size_varies = 0;
3713 if (decl_context == BITFIELD)
3714 bitfield = 1, decl_context = FIELD;
3716 if (decl_context == FUNCDEF)
3717 funcdef_flag = 1, decl_context = NORMAL;
3719 push_obstacks_nochange ();
3721 if (flag_traditional && allocation_temporary_p ())
3722 end_temporary_allocation ();
3724 /* Look inside a declarator for the name being declared
3725 and get it as a string, for an error message. */
3727 register tree decl = declarator;
3731 switch (TREE_CODE (decl))
3736 innermost_code = TREE_CODE (decl);
3737 decl = TREE_OPERAND (decl, 0);
3740 case IDENTIFIER_NODE:
3741 name = IDENTIFIER_POINTER (decl);
3752 /* A function definition's declarator must have the form of
3753 a function declarator. */
3755 if (funcdef_flag && innermost_code != CALL_EXPR)
3758 /* Anything declared one level down from the top level
3759 must be one of the parameters of a function
3760 (because the body is at least two levels down). */
3762 /* If this looks like a function definition, make it one,
3763 even if it occurs where parms are expected.
3764 Then store_parm_decls will reject it and not use it as a parm. */
3765 if (decl_context == NORMAL && !funcdef_flag
3766 && current_binding_level->level_chain == global_binding_level)
3767 decl_context = PARM;
3769 /* Look through the decl specs and record which ones appear.
3770 Some typespecs are defined as built-in typenames.
3771 Others, the ones that are modifiers of other types,
3772 are represented by bits in SPECBITS: set the bits for
3773 the modifiers that appear. Storage class keywords are also in SPECBITS.
3775 If there is a typedef name or a type, store the type in TYPE.
3776 This includes builtin typedefs such as `int'.
3778 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3779 and did not come from a user typedef.
3781 Set LONGLONG if `long' is mentioned twice. */
3783 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3786 register tree id = TREE_VALUE (spec);
3788 if (id == ridpointers[(int) RID_INT])
3790 if (id == ridpointers[(int) RID_CHAR])
3793 if (TREE_CODE (id) == IDENTIFIER_NODE)
3794 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3796 if (ridpointers[i] == id)
3798 if (i == (int) RID_LONG && specbits & (1<<i))
3801 error ("`long long long' is too long for GCC");
3805 pedwarn ("ANSI C does not support `long long'");
3809 else if (specbits & (1 << i))
3810 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3816 error ("two or more data types in declaration of `%s'", name);
3817 /* Actual typedefs come to us as TYPE_DECL nodes. */
3818 else if (TREE_CODE (id) == TYPE_DECL)
3820 type = TREE_TYPE (id);
3823 /* Built-in types come as identifiers. */
3824 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3826 register tree t = lookup_name (id);
3827 if (TREE_TYPE (t) == error_mark_node)
3829 else if (!t || TREE_CODE (t) != TYPE_DECL)
3830 error ("`%s' fails to be a typedef or built in type",
3831 IDENTIFIER_POINTER (id));
3834 type = TREE_TYPE (t);
3838 else if (TREE_CODE (id) != ERROR_MARK)
3844 typedef_type = type;
3846 size_varies = C_TYPE_VARIABLE_SIZE (type);
3848 /* No type at all: default to `int', and set DEFAULTED_INT
3849 because it was not a user-defined typedef. */
3853 if (funcdef_flag && warn_return_type
3854 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3855 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3856 warn_about_return_type = 1;
3858 type = integer_type_node;
3861 /* Now process the modifiers that were specified
3862 and check for invalid combinations. */
3864 /* Long double is a special combination. */
3866 if ((specbits & 1 << (int) RID_LONG)
3867 && TYPE_MAIN_VARIANT (type) == double_type_node)
3869 specbits &= ~ (1 << (int) RID_LONG);
3870 type = long_double_type_node;
3873 /* Check all other uses of type modifiers. */
3875 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3876 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3880 if (TREE_CODE (type) != INTEGER_TYPE)
3881 error ("long, short, signed or unsigned invalid for `%s'", name);
3882 else if ((specbits & 1 << (int) RID_LONG)
3883 && (specbits & 1 << (int) RID_SHORT))
3884 error ("long and short specified together for `%s'", name);
3885 else if (((specbits & 1 << (int) RID_LONG)
3886 || (specbits & 1 << (int) RID_SHORT))
3888 error ("long or short specified with char for `%s'", name);
3889 else if (((specbits & 1 << (int) RID_LONG)
3890 || (specbits & 1 << (int) RID_SHORT))
3891 && TREE_CODE (type) == REAL_TYPE)
3892 error ("long or short specified with floating type for `%s'", name);
3893 else if ((specbits & 1 << (int) RID_SIGNED)
3894 && (specbits & 1 << (int) RID_UNSIGNED))
3895 error ("signed and unsigned given together for `%s'", name);
3899 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
3901 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3903 if (flag_pedantic_errors)
3908 /* Discard the type modifiers if they are invalid. */
3911 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3912 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3917 /* Decide whether an integer type is signed or not.
3918 Optionally treat bitfields as signed by default. */
3919 if (specbits & 1 << (int) RID_UNSIGNED
3920 /* Traditionally, all bitfields are unsigned. */
3921 || (bitfield && flag_traditional
3922 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3923 || (bitfield && ! flag_signed_bitfields
3924 && (explicit_int || defaulted_int || explicit_char
3925 /* A typedef for plain `int' without `signed'
3926 can be controlled just like plain `int'. */
3927 || ! (typedef_decl != 0
3928 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3929 && TREE_CODE (type) != ENUMERAL_TYPE
3930 && !(specbits & 1 << (int) RID_SIGNED)))
3933 type = long_long_unsigned_type_node;
3934 else if (specbits & 1 << (int) RID_LONG)
3935 type = long_unsigned_type_node;
3936 else if (specbits & 1 << (int) RID_SHORT)
3937 type = short_unsigned_type_node;
3938 else if (type == char_type_node)
3939 type = unsigned_char_type_node;
3940 else if (typedef_decl)
3941 type = unsigned_type (type);
3943 type = unsigned_type_node;
3945 else if ((specbits & 1 << (int) RID_SIGNED)
3946 && type == char_type_node)
3947 type = signed_char_type_node;
3949 type = long_long_integer_type_node;
3950 else if (specbits & 1 << (int) RID_LONG)
3951 type = long_integer_type_node;
3952 else if (specbits & 1 << (int) RID_SHORT)
3953 type = short_integer_type_node;
3954 else if (specbits & 1 << (int) RID_COMPLEX)
3957 type = complex_double_type_node;
3958 else if (type == integer_type_node)
3959 type = complex_integer_type_node;
3960 else if (type == float_type_node)
3961 type = complex_float_type_node;
3962 else if (type == double_type_node)
3963 type = complex_double_type_node;
3964 else if (type == long_double_type_node)
3965 type = complex_long_double_type_node;
3967 error ("invalid complex type");
3970 /* Set CONSTP if this declaration is `const', whether by
3971 explicit specification or via a typedef.
3972 Likewise for VOLATILEP. */
3974 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3975 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3976 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3978 pedwarn ("duplicate `const'");
3980 pedwarn ("duplicate `volatile'");
3981 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
3982 type = TYPE_MAIN_VARIANT (type);
3984 /* Warn if two storage classes are given. Default to `auto'. */
3989 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3990 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3991 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3992 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3993 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3994 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
3996 /* Warn about storage classes that are invalid for certain
3997 kinds of declarations (parameters, typenames, etc.). */
4000 error ("multiple storage classes in declaration of `%s'", name);
4001 else if (funcdef_flag
4003 & ((1 << (int) RID_REGISTER)
4004 | (1 << (int) RID_AUTO)
4005 | (1 << (int) RID_TYPEDEF))))
4007 if (specbits & 1 << (int) RID_AUTO
4008 && (pedantic || current_binding_level == global_binding_level))
4009 pedwarn ("function definition declared `auto'");
4010 if (specbits & 1 << (int) RID_REGISTER)
4011 error ("function definition declared `register'");
4012 if (specbits & 1 << (int) RID_TYPEDEF)
4013 error ("function definition declared `typedef'");
4014 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4015 | (1 << (int) RID_AUTO));
4017 else if (decl_context != NORMAL && nclasses > 0)
4019 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4023 error ((decl_context == FIELD
4024 ? "storage class specified for structure field `%s'"
4025 : (decl_context == PARM
4026 ? "storage class specified for parameter `%s'"
4027 : "storage class specified for typename")),
4029 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4030 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4031 | (1 << (int) RID_EXTERN));
4034 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4036 /* `extern' with initialization is invalid if not at top level. */
4037 if (current_binding_level == global_binding_level)
4038 warning ("`%s' initialized and declared `extern'", name);
4040 error ("`%s' has both `extern' and initializer", name);
4042 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4043 && current_binding_level != global_binding_level)
4044 error ("nested function `%s' declared `extern'", name);
4045 else if (current_binding_level == global_binding_level
4046 && specbits & (1 << (int) RID_AUTO))
4047 error ("top-level declaration of `%s' specifies `auto'", name);
4048 else if ((specbits & 1 << (int) RID_ITERATOR)
4049 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4051 error ("iterator `%s' has derived type", name);
4052 type = error_mark_node;
4054 else if ((specbits & 1 << (int) RID_ITERATOR)
4055 && TREE_CODE (type) != INTEGER_TYPE)
4057 error ("iterator `%s' has noninteger type", name);
4058 type = error_mark_node;
4062 /* Now figure out the structure of the declarator proper.
4063 Descend through it, creating more complex types, until we reach
4064 the declared identifier (or NULL_TREE, in an absolute declarator). */
4066 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4068 if (type == error_mark_node)
4070 declarator = TREE_OPERAND (declarator, 0);
4074 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4075 an INDIRECT_REF (for *...),
4076 a CALL_EXPR (for ...(...)),
4077 an identifier (for the name being declared)
4078 or a null pointer (for the place in an absolute declarator
4079 where the name was omitted).
4080 For the last two cases, we have just exited the loop.
4082 At this point, TYPE is the type of elements of an array,
4083 or for a function to return, or for a pointer to point to.
4084 After this sequence of ifs, TYPE is the type of the
4085 array or function or pointer, and DECLARATOR has had its
4086 outermost layer removed. */
4088 if (TREE_CODE (declarator) == ARRAY_REF)
4090 register tree itype = NULL_TREE;
4091 register tree size = TREE_OPERAND (declarator, 1);
4092 /* An uninitialized decl with `extern' is a reference. */
4093 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4095 declarator = TREE_OPERAND (declarator, 0);
4097 /* Check for some types that there cannot be arrays of. */
4099 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4101 error ("declaration of `%s' as array of voids", name);
4102 type = error_mark_node;
4105 if (TREE_CODE (type) == FUNCTION_TYPE)
4107 error ("declaration of `%s' as array of functions", name);
4108 type = error_mark_node;
4111 if (size == error_mark_node)
4112 type = error_mark_node;
4114 if (type == error_mark_node)
4117 /* If this is a block level extern, it must live past the end
4118 of the function so that we can check it against other extern
4119 declarations (IDENTIFIER_LIMBO_VALUE). */
4120 if (extern_ref && allocation_temporary_p ())
4121 end_temporary_allocation ();
4123 /* If size was specified, set ITYPE to a range-type for that size.
4124 Otherwise, ITYPE remains null. finish_decl may figure it out
4125 from an initial value. */
4129 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4130 STRIP_TYPE_NOPS (size);
4132 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4133 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4135 error ("size of array `%s' has non-integer type", name);
4136 size = integer_one_node;
4138 if (pedantic && integer_zerop (size))
4139 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4140 if (TREE_CODE (size) == INTEGER_CST)
4142 constant_expression_warning (size);
4143 if (INT_CST_LT (size, integer_zero_node))
4145 error ("size of array `%s' is negative", name);
4146 size = integer_one_node;
4148 itype = build_index_type (size_binop (MINUS_EXPR, size,
4155 if (TREE_CONSTANT (size))
4156 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4158 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4160 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
4162 /* Make sure the array size remains visibly nonconstant
4163 even if it is (eg) a const variable with known value. */
4165 itype = variable_size (itype);
4166 itype = build_index_type (itype);
4170 #if 0 /* This had bad results for pointers to arrays, as in
4171 union incomplete (*foo)[4]; */
4172 /* Complain about arrays of incomplete types, except in typedefs. */
4174 if (TYPE_SIZE (type) == 0
4175 /* Avoid multiple warnings for nested array types. */
4176 && TREE_CODE (type) != ARRAY_TYPE
4177 && !(specbits & (1 << (int) RID_TYPEDEF))
4178 && !C_TYPE_BEING_DEFINED (type))
4179 warning ("array type has incomplete element type");
4182 /* Build the array type itself.
4183 Merge any constancy or volatility into the target type. */
4185 #if 0 /* We shouldn't have a function type here at all!
4186 Functions aren't allowed as array elements. */
4187 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4188 && (constp || volatilep))
4189 pedwarn ("ANSI C forbids const or volatile function types");
4191 if (constp || volatilep)
4192 type = c_build_type_variant (type, constp, volatilep);
4194 #if 0 /* don't clear these; leave them set so that the array type
4195 or the variable is itself const or volatile. */
4200 type = build_array_type (type, itype);
4202 C_TYPE_VARIABLE_SIZE (type) = 1;
4204 else if (TREE_CODE (declarator) == CALL_EXPR)
4206 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4207 || current_binding_level == global_binding_level);
4210 /* Declaring a function type.
4211 Make sure we have a valid type for the function to return. */
4212 if (type == error_mark_node)
4217 /* Warn about some types functions can't return. */
4219 if (TREE_CODE (type) == FUNCTION_TYPE)
4221 error ("`%s' declared as function returning a function", name);
4222 type = integer_type_node;
4224 if (TREE_CODE (type) == ARRAY_TYPE)
4226 error ("`%s' declared as function returning an array", name);
4227 type = integer_type_node;
4230 #ifndef TRADITIONAL_RETURN_FLOAT
4231 /* Traditionally, declaring return type float means double. */
4233 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4234 type = double_type_node;
4235 #endif /* TRADITIONAL_RETURN_FLOAT */
4237 /* If this is a block level extern, it must live past the end
4238 of the function so that we can check it against other extern
4239 declarations (IDENTIFIER_LIMBO_VALUE). */
4240 if (extern_ref && allocation_temporary_p ())
4241 end_temporary_allocation ();
4243 /* Construct the function type and go to the next
4244 inner layer of declarator. */
4246 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4248 /* Say it's a definition
4249 only for the CALL_EXPR
4250 closest to the identifier. */
4251 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4252 #if 0 /* This seems to be false. We turn off temporary allocation
4253 above in this function if -traditional.
4254 And this code caused inconsistent results with prototypes:
4255 callers would ignore them, and pass arguments wrong. */
4257 /* Omit the arg types if -traditional, since the arg types
4258 and the list links might not be permanent. */
4259 type = build_function_type (type,
4261 ? NULL_TREE : arg_types);
4263 type = build_function_type (type, arg_types);
4264 declarator = TREE_OPERAND (declarator, 0);
4266 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4267 the formal parameter list of this FUNCTION_TYPE to point to
4268 the FUNCTION_TYPE node itself. */
4273 for (link = current_function_parm_tags;
4275 link = TREE_CHAIN (link))
4276 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4279 else if (TREE_CODE (declarator) == INDIRECT_REF)
4281 /* Merge any constancy or volatility into the target type
4284 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4285 && (constp || volatilep))
4286 pedwarn ("ANSI C forbids const or volatile function types");
4287 if (constp || volatilep)
4288 type = c_build_type_variant (type, constp, volatilep);
4293 type = build_pointer_type (type);
4295 /* Process a list of type modifier keywords
4296 (such as const or volatile) that were given inside the `*'. */
4298 if (TREE_TYPE (declarator))
4300 register tree typemodlist;
4302 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4303 typemodlist = TREE_CHAIN (typemodlist))
4305 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4307 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4312 error ("invalid type modifier within pointer declarator");
4316 pedwarn ("duplicate `const'");
4318 pedwarn ("duplicate `volatile'");
4321 declarator = TREE_OPERAND (declarator, 0);
4328 /* Now TYPE has the actual type. */
4330 /* If this is declaring a typedef name, return a TYPE_DECL. */
4332 if (specbits & (1 << (int) RID_TYPEDEF))
4335 /* Note that the grammar rejects storage classes
4336 in typenames, fields or parameters */
4337 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4338 && (constp || volatilep))
4339 pedwarn ("ANSI C forbids const or volatile function types");
4340 if (constp || volatilep)
4341 type = c_build_type_variant (type, constp, volatilep);
4343 decl = build_decl (TYPE_DECL, declarator, type);
4344 if ((specbits & (1 << (int) RID_SIGNED))
4345 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4346 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4350 /* Detect the case of an array type of unspecified size
4351 which came, as such, direct from a typedef name.
4352 We must copy the type, so that each identifier gets
4353 a distinct type, so that each identifier's size can be
4354 controlled separately by its own initializer. */
4356 if (type != 0 && typedef_type != 0
4357 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4358 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4360 type = build_array_type (TREE_TYPE (type), 0);
4362 C_TYPE_VARIABLE_SIZE (type) = 1;
4365 /* If this is a type name (such as, in a cast or sizeof),
4366 compute the type and return it now. */
4368 if (decl_context == TYPENAME)
4370 /* Note that the grammar rejects storage classes
4371 in typenames, fields or parameters */
4372 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4373 && (constp || volatilep))
4374 pedwarn ("ANSI C forbids const or volatile function types");
4375 if (constp || volatilep)
4376 type = c_build_type_variant (type, constp, volatilep);
4381 /* `void' at top level (not within pointer)
4382 is allowed only in typedefs or type names.
4383 We don't complain about parms either, but that is because
4384 a better error message can be made later. */
4386 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM)
4388 error ("variable or field `%s' declared void",
4389 IDENTIFIER_POINTER (declarator));
4390 type = integer_type_node;
4393 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4394 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4399 if (decl_context == PARM)
4401 tree type_as_written = type;
4404 /* A parameter declared as an array of T is really a pointer to T.
4405 One declared as a function is really a pointer to a function. */
4407 if (TREE_CODE (type) == ARRAY_TYPE)
4409 /* Transfer const-ness of array into that of type pointed to. */
4410 type = build_pointer_type
4411 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4412 volatilep = constp = 0;
4415 else if (TREE_CODE (type) == FUNCTION_TYPE)
4417 if (pedantic && (constp || volatilep))
4418 pedwarn ("ANSI C forbids const or volatile function types");
4419 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4420 volatilep = constp = 0;
4423 decl = build_decl (PARM_DECL, declarator, type);
4425 C_DECL_VARIABLE_SIZE (decl) = 1;
4427 /* Compute the type actually passed in the parmlist,
4428 for the case where there is no prototype.
4429 (For example, shorts and chars are passed as ints.)
4430 When there is a prototype, this is overridden later. */
4432 DECL_ARG_TYPE (decl) = type;
4433 main_type = TYPE_MAIN_VARIANT (type);
4434 if (main_type == float_type_node)
4435 DECL_ARG_TYPE (decl) = double_type_node;
4436 /* Don't use TYPE_PRECISION to decide whether to promote,
4437 because we should convert short if it's the same size as int,
4438 but we should not convert long if it's the same size as int. */
4439 else if (C_PROMOTING_INTEGER_TYPE_P (main_type))
4441 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4442 && TREE_UNSIGNED (type))
4443 DECL_ARG_TYPE (decl) = unsigned_type_node;
4445 DECL_ARG_TYPE (decl) = integer_type_node;
4448 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4450 else if (decl_context == FIELD)
4452 /* Structure field. It may not be a function. */
4454 if (TREE_CODE (type) == FUNCTION_TYPE)
4456 error ("field `%s' declared as a function",
4457 IDENTIFIER_POINTER (declarator));
4458 type = build_pointer_type (type);
4460 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4462 error ("field `%s' has incomplete type",
4463 IDENTIFIER_POINTER (declarator));
4464 type = error_mark_node;
4466 /* Move type qualifiers down to element of an array. */
4467 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4469 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4471 TYPE_DOMAIN (type));
4472 #if 0 /* Leave the field const or volatile as well. */
4473 constp = volatilep = 0;
4476 decl = build_decl (FIELD_DECL, declarator, type);
4478 C_DECL_VARIABLE_SIZE (decl) = 1;
4480 else if (TREE_CODE (type) == FUNCTION_TYPE)
4482 /* Every function declaration is "external"
4483 except for those which are inside a function body
4484 in which `auto' is used.
4485 That is a case not specified by ANSI C,
4486 and we use it for forward declarations for nested functions. */
4487 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4488 || current_binding_level == global_binding_level);
4490 if (specbits & (1 << (int) RID_AUTO)
4491 && (pedantic || current_binding_level == global_binding_level))
4492 pedwarn ("invalid storage class for function `%s'",
4493 IDENTIFIER_POINTER (declarator));
4494 if (specbits & (1 << (int) RID_REGISTER))
4495 error ("invalid storage class for function `%s'",
4496 IDENTIFIER_POINTER (declarator));
4497 /* Function declaration not at top level.
4498 Storage classes other than `extern' are not allowed
4499 and `extern' makes no difference. */
4500 if (current_binding_level != global_binding_level
4501 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4503 pedwarn ("invalid storage class for function `%s'",
4504 IDENTIFIER_POINTER (declarator));
4506 /* If this is a block level extern, it must live past the end
4507 of the function so that we can check it against other
4508 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4509 if (extern_ref && allocation_temporary_p ())
4510 end_temporary_allocation ();
4512 decl = build_decl (FUNCTION_DECL, declarator, type);
4514 if (pedantic && (constp || volatilep)
4515 && ! DECL_IN_SYSTEM_HEADER (decl))
4516 pedwarn ("ANSI C forbids const or volatile functions");
4519 DECL_EXTERNAL (decl) = 1;
4520 /* Record absence of global scope for `static' or `auto'. */
4522 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4523 /* Record presence of `inline', if it is reasonable. */
4526 tree last = tree_last (TYPE_ARG_TYPES (type));
4528 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4529 warning ("cannot inline function `main'");
4530 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4532 warning ("inline declaration ignored for function with `...'");
4534 /* Assume that otherwise the function can be inlined. */
4535 DECL_INLINE (decl) = 1;
4537 if (specbits & (1 << (int) RID_EXTERN))
4538 current_extern_inline = 1;
4543 /* It's a variable. */
4544 /* An uninitialized decl with `extern' is a reference. */
4545 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4547 /* Move type qualifiers down to element of an array. */
4548 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4550 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4552 TYPE_DOMAIN (type));
4553 #if 0 /* Leave the variable const or volatile as well. */
4554 constp = volatilep = 0;
4558 /* If this is a block level extern, it must live past the end
4559 of the function so that we can check it against other
4560 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4561 if (extern_ref && allocation_temporary_p ())
4562 end_temporary_allocation ();
4564 decl = build_decl (VAR_DECL, declarator, type);
4566 C_DECL_VARIABLE_SIZE (decl) = 1;
4569 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4571 DECL_EXTERNAL (decl) = extern_ref;
4572 /* At top level, the presence of a `static' or `register' storage
4573 class specifier, or the absence of all storage class specifiers
4574 makes this declaration a definition (perhaps tentative). Also,
4575 the absence of both `static' and `register' makes it public. */
4576 if (current_binding_level == global_binding_level)
4580 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4581 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4583 /* Not at top level, only `static' makes a static definition. */
4586 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4587 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4590 if (specbits & 1 << (int) RID_ITERATOR)
4591 ITERATOR_P (decl) = 1;
4594 /* Record `register' declaration for warnings on &
4595 and in case doing stupid register allocation. */
4597 if (specbits & (1 << (int) RID_REGISTER))
4598 DECL_REGISTER (decl) = 1;
4600 /* Record constancy and volatility. */
4603 TREE_READONLY (decl) = 1;
4606 TREE_SIDE_EFFECTS (decl) = 1;
4607 TREE_THIS_VOLATILE (decl) = 1;
4609 /* If a type has volatile components, it should be stored in memory.
4610 Otherwise, the fact that those components are volatile
4611 will be ignored, and would even crash the compiler. */
4612 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4613 mark_addressable (decl);
4621 /* Decode the parameter-list info for a function type or function definition.
4622 The argument is the value returned by `get_parm_info' (or made in parse.y
4623 if there is an identifier list instead of a parameter decl list).
4624 These two functions are separate because when a function returns
4625 or receives functions then each is called multiple times but the order
4626 of calls is different. The last call to `grokparms' is always the one
4627 that contains the formal parameter names of a function definition.
4629 Store in `last_function_parms' a chain of the decls of parms.
4630 Also store in `last_function_parm_tags' a chain of the struct, union,
4631 and enum tags declared among the parms.
4633 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4635 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4636 a mere declaration. A nonempty identifier-list gets an error message
4637 when FUNCDEF_FLAG is zero. */
4640 grokparms (parms_info, funcdef_flag)
4644 tree first_parm = TREE_CHAIN (parms_info);
4646 last_function_parms = TREE_PURPOSE (parms_info);
4647 last_function_parm_tags = TREE_VALUE (parms_info);
4649 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4650 && !in_system_header)
4651 warning ("function declaration isn't a prototype");
4654 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4657 pedwarn ("parameter names (without types) in function declaration");
4659 last_function_parms = first_parm;
4666 /* We no longer test FUNCDEF_FLAG.
4667 If the arg types are incomplete in a declaration,
4668 they must include undefined tags.
4669 These tags can never be defined in the scope of the declaration,
4670 so the types can never be completed,
4671 and no call can be compiled successfully. */
4673 /* In a fcn definition, arg types must be complete. */
4676 for (parm = last_function_parms, typelt = first_parm;
4678 parm = TREE_CHAIN (parm))
4679 /* Skip over any enumeration constants declared here. */
4680 if (TREE_CODE (parm) == PARM_DECL)
4682 /* Barf if the parameter itself has an incomplete type. */
4683 tree type = TREE_VALUE (typelt);
4684 if (TYPE_SIZE (type) == 0)
4686 if (funcdef_flag && DECL_NAME (parm) != 0)
4687 error ("parameter `%s' has incomplete type",
4688 IDENTIFIER_POINTER (DECL_NAME (parm)));
4690 warning ("parameter has incomplete type");
4693 TREE_VALUE (typelt) = error_mark_node;
4694 TREE_TYPE (parm) = error_mark_node;
4697 #if 0 /* This has been replaced by parm_tags_warning
4698 which uses a more accurate criterion for what to warn about. */
4701 /* Now warn if is a pointer to an incomplete type. */
4702 while (TREE_CODE (type) == POINTER_TYPE
4703 || TREE_CODE (type) == REFERENCE_TYPE)
4704 type = TREE_TYPE (type);
4705 type = TYPE_MAIN_VARIANT (type);
4706 if (TYPE_SIZE (type) == 0)
4708 if (DECL_NAME (parm) != 0)
4709 warning ("parameter `%s' points to incomplete type",
4710 IDENTIFIER_POINTER (DECL_NAME (parm)));
4712 warning ("parameter points to incomplete type");
4716 typelt = TREE_CHAIN (typelt);
4719 /* Allocate the list of types the way we allocate a type. */
4720 if (first_parm && ! TREE_PERMANENT (first_parm))
4722 /* Construct a copy of the list of types
4723 on the saveable obstack. */
4725 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4726 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4728 return nreverse (result);
4731 /* The list we have is permanent already. */
4737 /* Return a tree_list node with info on a parameter list just parsed.
4738 The TREE_PURPOSE is a chain of decls of those parms.
4739 The TREE_VALUE is a list of structure, union and enum tags defined.
4740 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4741 This tree_list node is later fed to `grokparms'.
4743 VOID_AT_END nonzero means append `void' to the end of the type-list.
4744 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4747 get_parm_info (void_at_end)
4750 register tree decl, t;
4751 register tree types = 0;
4753 tree tags = gettags ();
4754 tree parms = getdecls ();
4756 tree order = current_binding_level->parm_order;
4758 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4759 if (void_at_end && parms != 0
4760 && TREE_CHAIN (parms) == 0
4761 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4762 && DECL_NAME (parms) == 0)
4765 storedecls (NULL_TREE);
4766 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4767 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4770 /* Extract enumerator values and other non-parms declared with the parms.
4771 Likewise any forward parm decls that didn't have real parm decls. */
4772 for (decl = parms; decl; )
4774 tree next = TREE_CHAIN (decl);
4776 if (TREE_CODE (decl) != PARM_DECL)
4778 TREE_CHAIN (decl) = new_parms;
4781 else if (TREE_ASM_WRITTEN (decl))
4783 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4784 TREE_CHAIN (decl) = new_parms;
4790 /* Put the parm decls back in the order they were in in the parm list. */
4791 for (t = order; t; t = TREE_CHAIN (t))
4794 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4796 TREE_CHAIN (TREE_VALUE (t)) = 0;
4799 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4802 /* Store the parmlist in the binding level since the old one
4803 is no longer a valid list. (We have changed the chain pointers.) */
4804 storedecls (new_parms);
4806 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4807 /* There may also be declarations for enumerators if an enumeration
4808 type is declared among the parms. Ignore them here. */
4809 if (TREE_CODE (decl) == PARM_DECL)
4811 /* Since there is a prototype,
4812 args are passed in their declared types. */
4813 tree type = TREE_TYPE (decl);
4814 DECL_ARG_TYPE (decl) = type;
4815 #ifdef PROMOTE_PROTOTYPES
4816 if (TREE_CODE (type) == INTEGER_TYPE
4817 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4818 DECL_ARG_TYPE (decl) = integer_type_node;
4821 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4822 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4823 && DECL_NAME (decl) == 0)
4825 error ("`void' in parameter list must be the entire list");
4831 return saveable_tree_cons (new_parms, tags,
4832 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4834 return saveable_tree_cons (new_parms, tags, nreverse (types));
4837 /* At end of parameter list, warn about any struct, union or enum tags
4838 defined within. Do so because these types cannot ever become complete. */
4841 parmlist_tags_warning ()
4846 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4848 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4849 /* An anonymous union parm type is meaningful as a GNU extension.
4850 So don't warn for that. */
4851 if (code == UNION_TYPE && !pedantic)
4853 if (TREE_PURPOSE (elt) != 0)
4854 warning ("`%s %s' declared inside parameter list",
4855 (code == RECORD_TYPE ? "struct"
4856 : code == UNION_TYPE ? "union"
4858 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4860 warning ("anonymous %s declared inside parameter list",
4861 (code == RECORD_TYPE ? "struct"
4862 : code == UNION_TYPE ? "union"
4867 warning ("its scope is only this definition or declaration,");
4868 warning ("which is probably not what you want.");
4874 /* Get the struct, enum or union (CODE says which) with tag NAME.
4875 Define the tag as a forward-reference if it is not defined. */
4878 xref_tag (code, name)
4879 enum tree_code code;
4882 int temporary = allocation_temporary_p ();
4884 /* If a cross reference is requested, look up the type
4885 already defined for this tag and return it. */
4887 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4888 /* Even if this is the wrong type of tag, return what we found.
4889 There will be an error message anyway, from pending_xref_error.
4890 If we create an empty xref just for an invalid use of the type,
4891 the main result is to create lots of superfluous error messages. */
4895 push_obstacks_nochange ();
4897 if (current_binding_level == global_binding_level && temporary)
4898 end_temporary_allocation ();
4900 /* If no such tag is yet defined, create a forward-reference node
4901 and record it as the "definition".
4902 When a real declaration of this type is found,
4903 the forward-reference will be altered into a real type. */
4905 ref = make_node (code);
4906 if (code == ENUMERAL_TYPE)
4908 /* (In ANSI, Enums can be referred to only if already defined.) */
4910 pedwarn ("ANSI C forbids forward references to `enum' types");
4911 /* Give the type a default layout like unsigned int
4912 to avoid crashing if it does not get defined. */
4913 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4914 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4915 TREE_UNSIGNED (ref) = 1;
4916 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4917 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4918 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4921 pushtag (name, ref);
4928 /* Make sure that the tag NAME is defined *in the current binding level*
4929 at least as a forward reference.
4930 CODE says which kind of tag NAME ought to be.
4932 We also do a push_obstacks_nochange
4933 whose matching pop is in finish_struct. */
4936 start_struct (code, name)
4937 enum tree_code code;
4940 /* If there is already a tag defined at this binding level
4941 (as a forward reference), just return it. */
4943 register tree ref = 0;
4945 push_obstacks_nochange ();
4946 if (current_binding_level == global_binding_level)
4947 end_temporary_allocation ();
4950 ref = lookup_tag (code, name, current_binding_level, 1);
4951 if (ref && TREE_CODE (ref) == code)
4953 C_TYPE_BEING_DEFINED (ref) = 1;
4954 if (TYPE_FIELDS (ref))
4955 error ((code == UNION_TYPE ? "redefinition of `union %s'"
4956 : "redefinition of `struct %s'"),
4957 IDENTIFIER_POINTER (name));
4962 /* Otherwise create a forward-reference just so the tag is in scope. */
4964 ref = make_node (code);
4965 pushtag (name, ref);
4966 C_TYPE_BEING_DEFINED (ref) = 1;
4970 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4971 of a structure component, returning a FIELD_DECL node.
4972 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4974 This is done during the parsing of the struct declaration.
4975 The FIELD_DECL nodes are chained together and the lot of them
4976 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4979 grokfield (filename, line, declarator, declspecs, width)
4982 tree declarator, declspecs, width;
4986 /* The corresponding pop_obstacks is in finish_decl. */
4987 push_obstacks_nochange ();
4989 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4991 finish_decl (value, NULL_TREE, NULL_TREE);
4992 DECL_INITIAL (value) = width;
4997 /* Function to help qsort sort FIELD_DECLs by name order. */
5000 field_decl_cmp (x, y)
5003 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
5006 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5007 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5009 We also do a pop_obstacks to match the push in start_struct. */
5012 finish_struct (t, fieldlist)
5013 register tree t, fieldlist;
5017 int toplevel = global_binding_level == current_binding_level;
5019 /* If this type was previously laid out as a forward reference,
5020 make sure we lay it out again. */
5024 /* Nameless union parm types are useful as GCC extension. */
5025 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5026 /* Otherwise, warn about any struct or union def. in parmlist. */
5027 if (in_parm_level_p ())
5030 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5031 : "structure defined inside parms"));
5032 else if (! flag_traditional)
5033 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5034 : "structure defined inside parms"));
5037 old_momentary = suspend_momentary ();
5039 if (fieldlist == 0 && pedantic)
5040 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5041 : "structure has no members"));
5043 /* Install struct as DECL_CONTEXT of each field decl.
5044 Also process specified field sizes.
5045 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5046 The specified size is found in the DECL_INITIAL.
5047 Store 0 there, except for ": 0" fields (so we can find them
5048 and delete them, below). */
5050 for (x = fieldlist; x; x = TREE_CHAIN (x))
5052 DECL_CONTEXT (x) = t;
5053 DECL_FIELD_SIZE (x) = 0;
5055 /* If any field is const, the structure type is pseudo-const. */
5056 if (TREE_READONLY (x))
5057 C_TYPE_FIELDS_READONLY (t) = 1;
5060 /* A field that is pseudo-const makes the structure likewise. */
5061 tree t1 = TREE_TYPE (x);
5062 while (TREE_CODE (t1) == ARRAY_TYPE)
5063 t1 = TREE_TYPE (t1);
5064 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5065 && C_TYPE_FIELDS_READONLY (t1))
5066 C_TYPE_FIELDS_READONLY (t) = 1;
5069 /* Any field that is volatile means variables of this type must be
5070 treated in some ways as volatile. */
5071 if (TREE_THIS_VOLATILE (x))
5072 C_TYPE_FIELDS_VOLATILE (t) = 1;
5074 /* Any field of nominal variable size implies structure is too. */
5075 if (C_DECL_VARIABLE_SIZE (x))
5076 C_TYPE_VARIABLE_SIZE (t) = 1;
5078 /* Detect invalid nested redefinition. */
5079 if (TREE_TYPE (x) == t)
5080 error ("nested redefinition of `%s'",
5081 IDENTIFIER_POINTER (TYPE_NAME (t)));
5083 /* Detect invalid bit-field size. */
5084 if (DECL_INITIAL (x))
5085 STRIP_NOPS (DECL_INITIAL (x));
5086 if (DECL_INITIAL (x))
5088 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5089 constant_expression_warning (DECL_INITIAL (x));
5092 error_with_decl (x, "bit-field `%s' width not an integer constant");
5093 DECL_INITIAL (x) = NULL;
5097 /* Detect invalid bit-field type. */
5098 if (DECL_INITIAL (x)
5099 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5100 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5102 error_with_decl (x, "bit-field `%s' has invalid type");
5103 DECL_INITIAL (x) = NULL;
5105 if (DECL_INITIAL (x) && pedantic
5106 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5107 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node)
5108 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5110 /* Detect and ignore out of range field width. */
5111 if (DECL_INITIAL (x))
5113 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5115 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
5117 DECL_INITIAL (x) = NULL;
5118 error_with_decl (x, "negative width in bit-field `%s'");
5120 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5121 || width > TYPE_PRECISION (TREE_TYPE (x)))
5123 DECL_INITIAL (x) = NULL;
5124 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5126 else if (width == 0 && DECL_NAME (x) != 0)
5128 error_with_decl (x, "zero width for bit-field `%s'");
5129 DECL_INITIAL (x) = NULL;
5133 /* Process valid field width. */
5134 if (DECL_INITIAL (x))
5136 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5138 DECL_FIELD_SIZE (x) = width;
5139 DECL_BIT_FIELD (x) = 1;
5140 DECL_INITIAL (x) = NULL;
5144 /* field size 0 => force desired amount of alignment. */
5145 #ifdef EMPTY_FIELD_BOUNDARY
5146 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5148 #ifdef PCC_BITFIELD_TYPE_MATTERS
5149 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5150 TYPE_ALIGN (TREE_TYPE (x)));
5156 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5157 : TYPE_ALIGN (TREE_TYPE (x)));
5158 /* Non-bit-fields are aligned for their type, except packed
5159 fields which require only BITS_PER_UNIT alignment. */
5160 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5164 /* Now DECL_INITIAL is null on all members. */
5166 /* Delete all duplicate fields from the fieldlist */
5167 for (x = fieldlist; x && TREE_CHAIN (x);)
5168 /* Anonymous fields aren't duplicates. */
5169 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5173 register tree y = fieldlist;
5177 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5183 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5185 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5186 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5188 else x = TREE_CHAIN (x);
5191 /* Now we have the nearly final fieldlist. Record it,
5192 then lay out the structure or union (including the fields). */
5194 TYPE_FIELDS (t) = fieldlist;
5198 /* Delete all zero-width bit-fields from the front of the fieldlist */
5200 && DECL_INITIAL (fieldlist))
5201 fieldlist = TREE_CHAIN (fieldlist);
5202 /* Delete all such members from the rest of the fieldlist */
5203 for (x = fieldlist; x;)
5205 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5206 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5207 else x = TREE_CHAIN (x);
5210 /* Now we have the truly final field list.
5211 Store it in this type and in the variants. */
5213 TYPE_FIELDS (t) = fieldlist;
5215 /* If there are lots of fields, sort so we can look through them fast.
5216 We arbitrarily consider 16 or more elts to be "a lot". */
5220 for (x = fieldlist; x; x = TREE_CHAIN (x))
5231 len += list_length (x);
5232 /* Use the same allocation policy here that make_node uses, to
5233 ensure that this lives as long as the rest of the struct decl.
5234 All decls in an inline function need to be saved. */
5235 if (allocation_temporary_p ())
5236 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5238 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5240 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5241 TYPE_LANG_SPECIFIC (t)->len = len;
5243 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5245 for (x = fieldlist; x; x = TREE_CHAIN (x))
5246 field_array[len++] = x;
5248 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5252 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5254 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5255 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5256 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5259 /* Promote each bit-field's type to int if it is narrower than that. */
5260 for (x = fieldlist; x; x = TREE_CHAIN (x))
5261 if (DECL_BIT_FIELD (x)
5262 && C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)))
5264 tree type = TREE_TYPE (x);
5266 /* Preserve unsignedness if traditional or if not really any wider. */
5267 if (TREE_UNSIGNED (type)
5268 && (flag_traditional
5269 || (TYPE_PRECISION (type)
5270 == TYPE_PRECISION (integer_type_node))))
5271 TREE_TYPE (x) = unsigned_type_node;
5273 TREE_TYPE (x) = integer_type_node;
5276 /* If this structure or union completes the type of any previous
5277 variable declaration, lay it out and output its rtl. */
5279 if (current_binding_level->n_incomplete != 0)
5282 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5284 if (TREE_TYPE (decl) == t
5285 && TREE_CODE (decl) != TYPE_DECL)
5287 layout_decl (decl, 0);
5288 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5289 maybe_objc_check_decl (decl);
5290 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5293 --current_binding_level->n_incomplete;
5295 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5296 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5298 tree element = TREE_TYPE (decl);
5299 while (TREE_CODE (element) == ARRAY_TYPE)
5300 element = TREE_TYPE (element);
5302 layout_array_type (TREE_TYPE (decl));
5307 resume_momentary (old_momentary);
5309 /* Finish debugging output for this type. */
5310 rest_of_type_compilation (t, toplevel);
5312 /* The matching push is in start_struct. */
5318 /* Lay out the type T, and its element type, and so on. */
5321 layout_array_type (t)
5324 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5325 layout_array_type (TREE_TYPE (t));
5329 /* Begin compiling the definition of an enumeration type.
5330 NAME is its name (or null if anonymous).
5331 Returns the type object, as yet incomplete.
5332 Also records info about it so that build_enumerator
5333 may be used to declare the individual values as they are read. */
5339 register tree enumtype = 0;
5341 /* If this is the real definition for a previous forward reference,
5342 fill in the contents in the same object that used to be the
5343 forward reference. */
5346 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5348 /* The corresponding pop_obstacks is in finish_enum. */
5349 push_obstacks_nochange ();
5350 /* If these symbols and types are global, make them permanent. */
5351 if (current_binding_level == global_binding_level)
5352 end_temporary_allocation ();
5354 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5356 enumtype = make_node (ENUMERAL_TYPE);
5357 pushtag (name, enumtype);
5360 C_TYPE_BEING_DEFINED (enumtype) = 1;
5362 if (TYPE_VALUES (enumtype) != 0)
5364 /* This enum is a named one that has been declared already. */
5365 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5367 /* Completely replace its old definition.
5368 The old enumerators remain defined, however. */
5369 TYPE_VALUES (enumtype) = 0;
5372 enum_next_value = integer_zero_node;
5378 /* After processing and defining all the values of an enumeration type,
5379 install their decls in the enumeration type and finish it off.
5380 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5381 Returns ENUMTYPE. */
5384 finish_enum (enumtype, values)
5385 register tree enumtype, values;
5388 tree minnode = 0, maxnode = 0;
5389 register HOST_WIDE_INT maxvalue = 0;
5390 register HOST_WIDE_INT minvalue = 0;
5392 unsigned precision = 0;
5393 int toplevel = global_binding_level == current_binding_level;
5394 int temporary = allocation_temporary_p ();
5396 if (in_parm_level_p ())
5397 warning ("enum defined inside parms");
5399 /* Calculate the maximum value of any enumerator in this type. */
5401 for (pair = values; pair; pair = TREE_CHAIN (pair))
5403 tree value = TREE_VALUE (pair);
5405 minnode = maxnode = TREE_VALUE (pair);
5408 if (tree_int_cst_lt (maxnode, value))
5410 if (tree_int_cst_lt (value, minnode))
5415 TYPE_MIN_VALUE (enumtype) = minnode;
5416 TYPE_MAX_VALUE (enumtype) = maxnode;
5418 /* Determine the precision this type needs. */
5420 if (TREE_INT_CST_HIGH (minnode) >= 0
5421 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5422 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5423 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5424 precision = TYPE_PRECISION (long_long_integer_type_node);
5427 maxvalue = TREE_INT_CST_LOW (maxnode);
5428 minvalue = TREE_INT_CST_LOW (minnode);
5431 precision = floor_log2 (maxvalue) + 1;
5434 /* Compute number of bits to represent magnitude of a negative value.
5435 Add one to MINVALUE since range of negative numbers
5436 includes the power of two. */
5437 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5438 if (negprecision > precision)
5439 precision = negprecision;
5440 precision += 1; /* room for sign bit */
5447 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5448 /* Use the width of the narrowest normal C type which is wide enough. */
5449 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5451 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5453 TYPE_SIZE (enumtype) = 0;
5454 layout_type (enumtype);
5456 /* An enum can have some negative values; then it is signed. */
5457 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5459 /* If the enumerators might not fit in an int, change their type now. */
5460 /* It seems more useful in the debugger to leave these as int
5461 unless the enumerator is wider than int. */
5462 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5463 for (pair = values; pair; pair = TREE_CHAIN (pair))
5465 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5466 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5467 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5468 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5471 /* Replace the decl nodes in VALUES with their names. */
5472 for (pair = values; pair; pair = TREE_CHAIN (pair))
5473 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5475 TYPE_VALUES (enumtype) = values;
5477 /* Finish debugging output for this type. */
5478 rest_of_type_compilation (enumtype, toplevel);
5480 /* This matches a push in start_enum. */
5486 /* Build and install a CONST_DECL for one value of the
5487 current enumeration type (one that was begun with start_enum).
5488 Return a tree-list containing the CONST_DECL and its value.
5489 Assignment of sequential values by default is handled here. */
5492 build_enumerator (name, value)
5497 /* Validate and default VALUE. */
5499 /* Remove no-op casts from the value. */
5501 STRIP_TYPE_NOPS (value);
5505 if (TREE_CODE (value) == INTEGER_CST)
5506 constant_expression_warning (value);
5509 error ("enumerator value for `%s' not integer constant",
5510 IDENTIFIER_POINTER (name));
5515 /* Default based on previous value. */
5516 /* It should no longer be possible to have NON_LVALUE_EXPR
5520 value = enum_next_value;
5522 error ("overflow in enumeration values");
5525 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5527 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5528 value = integer_zero_node;
5531 /* Set basis for default for next value. */
5532 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5533 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5535 /* Now create a declaration for the enum value name. */
5537 decl = build_decl (CONST_DECL, name, integer_type_node);
5538 DECL_INITIAL (decl) = value;
5539 TREE_TYPE (value) = integer_type_node;
5542 return saveable_tree_cons (decl, value, NULL_TREE);
5545 /* Create the FUNCTION_DECL for a function definition.
5546 DECLSPECS and DECLARATOR are the parts of the declaration;
5547 they describe the function's name and the type it returns,
5548 but twisted together in a fashion that parallels the syntax of C.
5550 This function creates a binding context for the function body
5551 as well as setting up the FUNCTION_DECL in current_function_decl.
5553 Returns 1 on success. If the DECLARATOR is not suitable for a function
5554 (it defines a datum instead), we return 0, which tells
5555 yyparse to report a parse error.
5557 NESTED is nonzero for a function nested within another function. */
5560 start_function (declspecs, declarator, nested)
5561 tree declarator, declspecs;
5564 tree decl1, old_decl;
5567 current_function_returns_value = 0; /* Assume, until we see it does. */
5568 current_function_returns_null = 0;
5569 warn_about_return_type = 0;
5570 current_extern_inline = 0;
5571 c_function_varargs = 0;
5573 shadowed_labels = 0;
5575 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5577 /* If the declarator is not suitable for a function definition,
5578 cause a syntax error. */
5582 announce_function (decl1);
5584 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5586 error ("return-type is an incomplete type");
5587 /* Make it return void instead. */
5589 = build_function_type (void_type_node,
5590 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5593 if (warn_about_return_type)
5594 warning ("return-type defaults to `int'");
5596 /* Save the parm names or decls from this function's declarator
5597 where store_parm_decls will find them. */
5598 current_function_parms = last_function_parms;
5599 current_function_parm_tags = last_function_parm_tags;
5601 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5602 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5603 DECL_INITIAL (decl1) = error_mark_node;
5605 /* If this definition isn't a prototype and we had a prototype declaration
5606 before, copy the arg type info from that prototype.
5607 But not if what we had before was a builtin function. */
5608 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5609 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5610 && !DECL_BUILT_IN (old_decl)
5611 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5612 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5613 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5615 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5616 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5617 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5620 /* Optionally warn of old-fashioned def with no previous prototype. */
5621 if (warn_strict_prototypes
5622 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5623 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5624 warning ("function declaration isn't a prototype");
5625 /* Optionally warn of any global def with no previous prototype. */
5626 else if (warn_missing_prototypes
5627 && TREE_PUBLIC (decl1)
5628 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5629 warning_with_decl (decl1, "no previous prototype for `%s'");
5630 /* Optionally warn of any def with no previous prototype
5631 if the function has already been used. */
5632 else if (warn_missing_prototypes
5633 && old_decl != 0 && TREE_USED (old_decl)
5634 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5635 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5637 /* This is a definition, not a reference.
5638 So normally clear DECL_EXTERNAL.
5639 However, `extern inline' acts like a declaration
5640 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5641 DECL_EXTERNAL (decl1) = current_extern_inline;
5643 /* This function exists in static storage.
5644 (This does not mean `static' in the C sense!) */
5645 TREE_STATIC (decl1) = 1;
5647 /* A nested function is not global. */
5648 if (current_function_decl != 0)
5649 TREE_PUBLIC (decl1) = 0;
5651 /* Record the decl so that the function name is defined.
5652 If we already have a decl for this name, and it is a FUNCTION_DECL,
5653 use the old decl. */
5655 current_function_decl = pushdecl (decl1);
5658 declare_parm_level (1);
5659 current_binding_level->subblocks_tag_transparent = 1;
5661 make_function_rtl (current_function_decl);
5663 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5664 /* Promote the value to int before returning it. */
5665 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5667 /* It retains unsignedness if traditional
5668 or if not really getting wider. */
5669 if (TREE_UNSIGNED (restype)
5670 && (flag_traditional
5671 || (TYPE_PRECISION (restype)
5672 == TYPE_PRECISION (integer_type_node))))
5673 restype = unsigned_type_node;
5675 restype = integer_type_node;
5677 DECL_RESULT (current_function_decl)
5678 = build_decl (RESULT_DECL, NULL_TREE, restype);
5681 /* Allocate further tree nodes temporarily during compilation
5682 of this function only. */
5683 temporary_allocation ();
5685 /* If this fcn was already referenced via a block-scope `extern' decl
5686 (or an implicit decl), propagate certain information about the usage. */
5687 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5688 TREE_ADDRESSABLE (current_function_decl) = 1;
5693 /* Record that this function is going to be a varargs function.
5694 This is called before store_parm_decls, which is too early
5695 to call mark_varargs directly. */
5700 c_function_varargs = 1;
5703 /* Store the parameter declarations into the current function declaration.
5704 This is called after parsing the parameter declarations, before
5705 digesting the body of the function.
5707 For an old-style definition, modify the function's type
5708 to specify at least the number of arguments. */
5713 register tree fndecl = current_function_decl;
5716 /* This is either a chain of PARM_DECLs (if a prototype was used)
5717 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5718 tree specparms = current_function_parms;
5720 /* This is a list of types declared among parms in a prototype. */
5721 tree parmtags = current_function_parm_tags;
5723 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5724 register tree parmdecls = getdecls ();
5726 /* This is a chain of any other decls that came in among the parm
5727 declarations. If a parm is declared with enum {foo, bar} x;
5728 then CONST_DECLs for foo and bar are put here. */
5731 /* Nonzero if this definition is written with a prototype. */
5734 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5736 /* This case is when the function was defined with an ANSI prototype.
5737 The parms already have decls, so we need not do anything here
5738 except record them as in effect
5739 and complain if any redundant old-style parm decls were written. */
5750 error_with_decl (fndecl,
5751 "parm types given both in parmlist and separately");
5752 /* Get rid of the erroneous decls; don't keep them on
5753 the list of parms, since they might not be PARM_DECLs. */
5754 for (decl = current_binding_level->names;
5755 decl; decl = TREE_CHAIN (decl))
5756 if (DECL_NAME (decl))
5757 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5758 for (link = current_binding_level->shadowed;
5759 link; link = TREE_CHAIN (link))
5760 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5761 current_binding_level->names = 0;
5762 current_binding_level->shadowed = 0;
5765 specparms = nreverse (specparms);
5766 for (parm = specparms; parm; parm = next)
5768 next = TREE_CHAIN (parm);
5769 if (TREE_CODE (parm) == PARM_DECL)
5771 if (DECL_NAME (parm) == 0)
5772 error_with_decl (parm, "parameter name omitted");
5773 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5775 error_with_decl (parm, "parameter `%s' declared void");
5776 /* Change the type to error_mark_node so this parameter
5777 will be ignored by assign_parms. */
5778 TREE_TYPE (parm) = error_mark_node;
5784 /* If we find an enum constant or a type tag,
5785 put it aside for the moment. */
5786 TREE_CHAIN (parm) = 0;
5787 others = chainon (others, parm);
5791 /* Get the decls in their original chain order
5792 and record in the function. */
5793 DECL_ARGUMENTS (fndecl) = getdecls ();
5796 /* If this function takes a variable number of arguments,
5797 add a phony parameter to the end of the parm list,
5798 to represent the position of the first unnamed argument. */
5799 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5802 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5803 /* Let's hope the address of the unnamed parm
5804 won't depend on its type. */
5805 TREE_TYPE (dummy) = integer_type_node;
5806 DECL_ARG_TYPE (dummy) = integer_type_node;
5807 DECL_ARGUMENTS (fndecl)
5808 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5812 /* Now pushdecl the enum constants. */
5813 for (parm = others; parm; parm = next)
5815 next = TREE_CHAIN (parm);
5816 if (DECL_NAME (parm) == 0)
5818 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5820 else if (TREE_CODE (parm) != PARM_DECL)
5824 storetags (chainon (parmtags, gettags ()));
5828 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5829 each with a parm name as the TREE_VALUE.
5831 PARMDECLS is a chain of declarations for parameters.
5832 Warning! It can also contain CONST_DECLs which are not parameters
5833 but are names of enumerators of any enum types
5834 declared among the parameters.
5836 First match each formal parameter name with its declaration.
5837 Associate decls with the names and store the decls
5838 into the TREE_PURPOSE slots. */
5840 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5841 DECL_RESULT (parm) = 0;
5843 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5845 register tree tail, found = NULL;
5847 if (TREE_VALUE (parm) == 0)
5849 error_with_decl (fndecl, "parameter name missing from parameter list");
5850 TREE_PURPOSE (parm) = 0;
5854 /* See if any of the parmdecls specifies this parm by name.
5855 Ignore any enumerator decls. */
5856 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5857 if (DECL_NAME (tail) == TREE_VALUE (parm)
5858 && TREE_CODE (tail) == PARM_DECL)
5864 /* If declaration already marked, we have a duplicate name.
5865 Complain, and don't use this decl twice. */
5866 if (found && DECL_RESULT (found) != 0)
5868 error_with_decl (found, "multiple parameters named `%s'");
5872 /* If the declaration says "void", complain and ignore it. */
5873 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5875 error_with_decl (found, "parameter `%s' declared void");
5876 TREE_TYPE (found) = integer_type_node;
5877 DECL_ARG_TYPE (found) = integer_type_node;
5878 layout_decl (found, 0);
5881 /* Traditionally, a parm declared float is actually a double. */
5882 if (found && flag_traditional
5883 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5885 TREE_TYPE (found) = double_type_node;
5886 DECL_ARG_TYPE (found) = double_type_node;
5887 layout_decl (found, 0);
5890 /* If no declaration found, default to int. */
5893 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5895 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5896 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5897 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5899 warning_with_decl (found, "type of `%s' defaults to `int'");
5903 TREE_PURPOSE (parm) = found;
5905 /* Mark this decl as "already found" -- see test, above.
5906 It is safe to use DECL_RESULT for this
5907 since it is not used in PARM_DECLs or CONST_DECLs. */
5908 DECL_RESULT (found) = error_mark_node;
5911 /* Put anything which is on the parmdecls chain and which is
5912 not a PARM_DECL onto the list NONPARMS. (The types of
5913 non-parm things which might appear on the list include
5914 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5915 any actual PARM_DECLs not matched with any names. */
5918 for (parm = parmdecls; parm; )
5920 tree next = TREE_CHAIN (parm);
5921 TREE_CHAIN (parm) = 0;
5923 if (TREE_CODE (parm) != PARM_DECL)
5924 nonparms = chainon (nonparms, parm);
5927 /* Complain about args with incomplete types. */
5928 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5930 error_with_decl (parm, "parameter `%s' has incomplete type");
5931 TREE_TYPE (parm) = error_mark_node;
5934 if (DECL_RESULT (parm) == 0)
5936 error_with_decl (parm,
5937 "declaration for parameter `%s' but no such parameter");
5938 /* Pretend the parameter was not missing.
5939 This gets us to a standard state and minimizes
5940 further error messages. */
5942 = chainon (specparms,
5943 tree_cons (parm, NULL_TREE, NULL_TREE));
5950 /* Chain the declarations together in the order of the list of names. */
5951 /* Store that chain in the function decl, replacing the list of names. */
5953 DECL_ARGUMENTS (fndecl) = 0;
5956 for (last = 0; parm; parm = TREE_CHAIN (parm))
5957 if (TREE_PURPOSE (parm))
5960 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5962 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5963 last = TREE_PURPOSE (parm);
5964 TREE_CHAIN (last) = 0;
5968 /* If there was a previous prototype,
5969 set the DECL_ARG_TYPE of each argument according to
5970 the type previously specified, and report any mismatches. */
5972 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5975 for (parm = DECL_ARGUMENTS (fndecl),
5976 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5977 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5978 != void_type_node));
5979 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5981 if (parm == 0 || type == 0
5982 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5984 error ("number of arguments doesn't match prototype");
5985 error_with_file_and_line (current_function_prototype_file,
5986 current_function_prototype_line,
5987 "prototype declaration");
5990 /* Type for passing arg must be consistent
5991 with that declared for the arg. */
5992 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
5994 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5995 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5997 /* Adjust argument to match prototype. E.g. a previous
5998 `int foo(float);' prototype causes
5999 `int foo(x) float x; {...}' to be treated like
6000 `int foo(float x) {...}'. This is particularly
6001 useful for argument types like uid_t. */
6002 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6003 #ifdef PROMOTE_PROTOTYPES
6004 if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6005 && TYPE_PRECISION (TREE_TYPE (parm))
6006 < TYPE_PRECISION (integer_type_node))
6007 DECL_ARG_TYPE (parm) = integer_type_node;
6011 pedwarn ("promoted argument `%s' doesn't match prototype",
6012 IDENTIFIER_POINTER (DECL_NAME (parm)));
6013 warning_with_file_and_line
6014 (current_function_prototype_file,
6015 current_function_prototype_line,
6016 "prototype declaration");
6019 /* If -traditional, allow `int' argument to match
6020 `unsigned' prototype. */
6021 else if (! (flag_traditional
6022 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6023 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6025 error ("argument `%s' doesn't match prototype",
6026 IDENTIFIER_POINTER (DECL_NAME (parm)));
6027 error_with_file_and_line (current_function_prototype_file,
6028 current_function_prototype_line,
6029 "prototype declaration");
6033 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6036 /* Otherwise, create a prototype that would match. */
6040 register tree actual, type;
6041 register tree last = 0;
6043 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6045 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6048 TREE_CHAIN (last) = type;
6053 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6055 TREE_CHAIN (last) = type;
6059 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6060 of the type of this function, but we need to avoid having this
6061 affect the types of other similarly-typed functions, so we must
6062 first force the generation of an identical (but separate) type
6063 node for the relevant function type. The new node we create
6064 will be a variant of the main variant of the original function
6067 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6069 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6072 /* Now store the final chain of decls for the arguments
6073 as the decl-chain of the current lexical scope.
6074 Put the enumerators in as well, at the front so that
6075 DECL_ARGUMENTS is not modified. */
6077 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6080 /* Make sure the binding level for the top of the function body
6081 gets a BLOCK if there are any in the function.
6082 Otherwise, the dbx output is wrong. */
6084 keep_next_if_subblocks = 1;
6086 /* ??? This might be an improvement,
6087 but needs to be thought about some more. */
6089 keep_next_level_flag = 1;
6092 /* Write a record describing this function definition to the prototypes
6093 file (if requested). */
6095 gen_aux_info_record (fndecl, 1, 0, prototype);
6097 /* Initialize the RTL code for the function. */
6099 init_function_start (fndecl, input_filename, lineno);
6101 /* If this is a varargs function, inform function.c. */
6103 if (c_function_varargs)
6106 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6108 declare_function_name ();
6110 /* Set up parameters and prepare for return, for the function. */
6112 expand_function_start (fndecl, 0);
6114 /* If this function is `main', emit a call to `__main'
6115 to run global initializers, etc. */
6116 if (DECL_NAME (fndecl)
6117 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6118 && DECL_CONTEXT (fndecl) == NULL_TREE)
6119 expand_main_function ();
6122 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6123 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6124 stands for an ellipsis in the identifier list.
6126 PARMLIST is the data returned by get_parm_info for the
6127 parmlist that follows the semicolon.
6129 We return a value of the same sort that get_parm_info returns,
6130 except that it describes the combination of identifiers and parmlist. */
6133 combine_parm_decls (specparms, parmlist, void_at_end)
6134 tree specparms, parmlist;
6137 register tree fndecl = current_function_decl;
6140 tree parmdecls = TREE_PURPOSE (parmlist);
6142 /* This is a chain of any other decls that came in among the parm
6143 declarations. They were separated already by get_parm_info,
6144 so we just need to keep them separate. */
6145 tree nonparms = TREE_VALUE (parmlist);
6149 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6150 DECL_RESULT (parm) = 0;
6152 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6154 register tree tail, found = NULL;
6156 /* See if any of the parmdecls specifies this parm by name. */
6157 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6158 if (DECL_NAME (tail) == TREE_VALUE (parm))
6164 /* If declaration already marked, we have a duplicate name.
6165 Complain, and don't use this decl twice. */
6166 if (found && DECL_RESULT (found) != 0)
6168 error_with_decl (found, "multiple parameters named `%s'");
6172 /* If the declaration says "void", complain and ignore it. */
6173 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6175 error_with_decl (found, "parameter `%s' declared void");
6176 TREE_TYPE (found) = integer_type_node;
6177 DECL_ARG_TYPE (found) = integer_type_node;
6178 layout_decl (found, 0);
6181 /* Traditionally, a parm declared float is actually a double. */
6182 if (found && flag_traditional
6183 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6185 TREE_TYPE (found) = double_type_node;
6186 DECL_ARG_TYPE (found) = double_type_node;
6187 layout_decl (found, 0);
6190 /* If no declaration found, default to int. */
6193 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6195 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6196 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6197 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6198 error (found, "type of parameter `%s' is not declared");
6202 TREE_PURPOSE (parm) = found;
6204 /* Mark this decl as "already found" -- see test, above.
6205 It is safe to use DECL_RESULT for this
6206 since it is not used in PARM_DECLs or CONST_DECLs. */
6207 DECL_RESULT (found) = error_mark_node;
6210 /* Complain about any actual PARM_DECLs not matched with any names. */
6212 for (parm = parmdecls; parm; )
6214 tree next = TREE_CHAIN (parm);
6215 TREE_CHAIN (parm) = 0;
6217 /* Complain about args with incomplete types. */
6218 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6220 error_with_decl (parm, "parameter `%s' has incomplete type");
6221 TREE_TYPE (parm) = error_mark_node;
6224 if (DECL_RESULT (parm) == 0)
6226 error_with_decl (parm,
6227 "declaration for parameter `%s' but no such parameter");
6228 /* Pretend the parameter was not missing.
6229 This gets us to a standard state and minimizes
6230 further error messages. */
6232 = chainon (specparms,
6233 tree_cons (parm, NULL_TREE, NULL_TREE));
6239 /* Chain the declarations together in the order of the list of names.
6240 At the same time, build up a list of their types, in reverse order. */
6246 for (last = 0; parm; parm = TREE_CHAIN (parm))
6247 if (TREE_PURPOSE (parm))
6250 parmdecls = TREE_PURPOSE (parm);
6252 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6253 last = TREE_PURPOSE (parm);
6254 TREE_CHAIN (last) = 0;
6256 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6261 return saveable_tree_cons (parmdecls, nonparms,
6262 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6264 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6267 /* Finish up a function declaration and compile that function
6268 all the way to assembler language output. The free the storage
6269 for the function definition.
6271 This is called after parsing the body of the function definition.
6273 NESTED is nonzero if the function being finished is nested in another. */
6276 finish_function (nested)
6279 register tree fndecl = current_function_decl;
6281 /* TREE_READONLY (fndecl) = 1;
6282 This caused &foo to be of type ptr-to-const-function
6283 which then got a warning when stored in a ptr-to-function variable. */
6286 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6288 /* Must mark the RESULT_DECL as being in this function. */
6290 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6292 /* Obey `register' declarations if `setjmp' is called in this fn. */
6293 if (flag_traditional && current_function_calls_setjmp)
6295 setjmp_protect (DECL_INITIAL (fndecl));
6296 setjmp_protect_args ();
6299 #ifdef DEFAULT_MAIN_RETURN
6300 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6302 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6303 != integer_type_node)
6304 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6307 /* Make it so that `main' always returns success by default. */
6308 DEFAULT_MAIN_RETURN;
6313 /* Generate rtl for function exit. */
6314 expand_function_end (input_filename, lineno);
6316 /* So we can tell if jump_optimize sets it to 1. */
6319 /* Run the optimizers and output the assembler code for this function. */
6320 rest_of_compilation (fndecl);
6322 current_function_returns_null |= can_reach_end;
6324 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6325 warning ("`volatile' function does return");
6326 else if (warn_return_type && can_reach_end
6327 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6328 /* If this function returns non-void and control can drop through,
6330 warning ("control reaches end of non-void function");
6331 /* With just -W, complain only if function returns both with
6332 and without a value. */
6333 else if (extra_warnings
6334 && current_function_returns_value && current_function_returns_null)
6335 warning ("this function may return with or without a value");
6337 /* Free all the tree nodes making up this function. */
6338 /* Switch back to allocating nodes permanently
6339 until we start another function. */
6341 permanent_allocation ();
6343 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6345 /* Stop pointing to the local nodes about to be freed. */
6346 /* But DECL_INITIAL must remain nonzero so we know this
6347 was an actual function definition. */
6348 /* For a nested function, this is done in pop_c_function_context. */
6349 DECL_INITIAL (fndecl) = error_mark_node;
6350 DECL_ARGUMENTS (fndecl) = 0;
6355 /* Let the error reporting routines know that we're outside a
6356 function. For a nested function, this value is used in
6357 pop_c_function_context and then reset via pop_function_context. */
6358 current_function_decl = NULL;
6362 /* Save and restore the variables in this file and elsewhere
6363 that keep track of the progress of compilation of the current function.
6364 Used for nested functions. */
6368 struct c_function *next;
6369 tree enum_next_value;
6371 tree shadowed_labels;
6374 int warn_about_return_type;
6376 struct binding_level *binding_level;
6379 struct c_function *c_function_chain;
6381 /* Save and reinitialize the variables
6382 used during compilation of a C function. */
6385 push_c_function_context ()
6387 struct c_function *p
6388 = (struct c_function *) xmalloc (sizeof (struct c_function));
6391 pedwarn ("ANSI C forbids nested functions");
6393 push_function_context ();
6395 p->next = c_function_chain;
6396 c_function_chain = p;
6398 p->enum_next_value = enum_next_value;
6399 p->named_labels = named_labels;
6400 p->shadowed_labels = shadowed_labels;
6401 p->returns_value = current_function_returns_value;
6402 p->returns_null = current_function_returns_null;
6403 p->warn_about_return_type = warn_about_return_type;
6404 p->extern_inline = current_extern_inline;
6405 p->binding_level = current_binding_level;
6408 /* Restore the variables used during compilation of a C function. */
6411 pop_c_function_context ()
6413 struct c_function *p = c_function_chain;
6416 /* Bring back all the labels that were shadowed. */
6417 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6418 if (DECL_NAME (TREE_VALUE (link)) != 0)
6419 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6420 = TREE_VALUE (link);
6422 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6424 /* Stop pointing to the local nodes about to be freed. */
6425 /* But DECL_INITIAL must remain nonzero so we know this
6426 was an actual function definition. */
6427 DECL_INITIAL (current_function_decl) = error_mark_node;
6428 DECL_ARGUMENTS (current_function_decl) = 0;
6431 pop_function_context ();
6433 c_function_chain = p->next;
6435 enum_next_value = p->enum_next_value;
6436 named_labels = p->named_labels;
6437 shadowed_labels = p->shadowed_labels;
6438 current_function_returns_value = p->returns_value;
6439 current_function_returns_null = p->returns_null;
6440 warn_about_return_type = p->warn_about_return_type;
6441 current_extern_inline = p->extern_inline;
6442 current_binding_level = p->binding_level;