1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993 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
211 constant value. Note that will do not have to save this or `enum_overflow'
212 around nested function definition since such a definition could only
213 occur in an enum value expression and we don't use these variables in
216 static tree enum_next_value;
218 /* Nonzero means that there was overflow computing enum_next_value. */
220 static int enum_overflow;
222 /* Parsing a function declarator leaves a list of parameter names
223 or a chain or parameter decls here. */
225 static tree last_function_parms;
227 /* Parsing a function declarator leaves here a chain of structure
228 and enum types declared in the parmlist. */
230 static tree last_function_parm_tags;
232 /* After parsing the declarator that starts a function definition,
233 `start_function' puts here the list of parameter names or chain of decls.
234 `store_parm_decls' finds it here. */
236 static tree current_function_parms;
238 /* Similar, for last_function_parm_tags. */
239 static tree current_function_parm_tags;
241 /* Similar, for the file and line that the prototype came from if this is
242 an old-style definition. */
243 static char *current_function_prototype_file;
244 static int current_function_prototype_line;
246 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
247 that have names. Here so we can clear out their names' definitions
248 at the end of the function. */
250 static tree named_labels;
252 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
254 static tree shadowed_labels;
256 /* Nonzero when store_parm_decls is called indicates a varargs function.
257 Value not meaningful after store_parm_decls. */
259 static int c_function_varargs;
261 /* The FUNCTION_DECL for the function currently being compiled,
262 or 0 if between functions. */
263 tree current_function_decl;
265 /* Set to 0 at beginning of a function definition, set to 1 if
266 a return statement that specifies a return value is seen. */
268 int current_function_returns_value;
270 /* Set to 0 at beginning of a function definition, set to 1 if
271 a return statement with no argument is seen. */
273 int current_function_returns_null;
275 /* Set to nonzero by `grokdeclarator' for a function
276 whose return type is defaulted, if warnings for this are desired. */
278 static int warn_about_return_type;
280 /* Nonzero when starting a function declared `extern inline'. */
282 static int current_extern_inline;
284 /* For each binding contour we allocate a binding_level structure
285 * which records the names defined in that contour.
288 * 1) one for each function definition,
289 * where internal declarations of the parameters appear.
290 * 2) one for each compound statement,
291 * to record its declarations.
293 * The current meaning of a name can be found by searching the levels from
294 * the current one out to the global one.
297 /* Note that the information in the `names' component of the global contour
298 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
302 /* A chain of _DECL nodes for all variables, constants, functions,
303 and typedef types. These are in the reverse of the order supplied.
307 /* A list of structure, union and enum definitions,
308 * for looking up tag names.
309 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
310 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
311 * or ENUMERAL_TYPE node.
315 /* For each level, a list of shadowed outer-level local definitions
316 to be restored when this level is popped.
317 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
318 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
321 /* For each level (except not the global one),
322 a chain of BLOCK nodes for all the levels
323 that were entered and exited one level down. */
326 /* The BLOCK node for this level, if one has been preallocated.
327 If 0, the BLOCK is allocated (if needed) when the level is popped. */
330 /* The binding level which this one is contained in (inherits from). */
331 struct binding_level *level_chain;
333 /* Nonzero for the level that holds the parameters of a function. */
336 /* Nonzero if this level "doesn't exist" for tags. */
337 char tag_transparent;
339 /* Nonzero if sublevels of this level "don't exist" for tags.
340 This is set in the parm level of a function definition
341 while reading the function body, so that the outermost block
342 of the function body will be tag-transparent. */
343 char subblocks_tag_transparent;
345 /* Nonzero means make a BLOCK for this level regardless of all else. */
348 /* Nonzero means make a BLOCK if this level has any subblocks. */
349 char keep_if_subblocks;
351 /* Number of decls in `names' that have incomplete
352 structure or union types. */
355 /* A list of decls giving the (reversed) specified order of parms,
356 not including any forward-decls in the parmlist.
357 This is so we can put the parms in proper order for assign_parms. */
361 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
363 /* The binding level currently in effect. */
365 static struct binding_level *current_binding_level;
367 /* A chain of binding_level structures awaiting reuse. */
369 static struct binding_level *free_binding_level;
371 /* The outermost binding level, for names of file scope.
372 This is created when the compiler is started and exists
373 through the entire run. */
375 static struct binding_level *global_binding_level;
377 /* Binding level structures are initialized by copying this one. */
379 static struct binding_level clear_binding_level
380 = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0};
382 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
384 static int keep_next_level_flag;
386 /* Nonzero means make a BLOCK for the next level pushed
387 if it has subblocks. */
389 static int keep_next_if_subblocks;
391 /* The chain of outer levels of label scopes.
392 This uses the same data structure used for binding levels,
393 but it works differently: each link in the chain records
394 saved values of named_labels and shadowed_labels for
395 a label binding level outside the current one. */
397 static struct binding_level *label_level_chain;
399 /* Forward declarations. */
401 static tree grokparms (), grokdeclarator ();
403 tree builtin_function ();
404 void shadow_tag_warned ();
406 static tree lookup_tag ();
407 static tree lookup_tag_reverse ();
408 tree lookup_name_current_level ();
409 static char *redeclaration_error_message ();
410 static void layout_array_type ();
412 /* C-specific option variables. */
414 /* Nonzero means allow type mismatches in conditional expressions;
415 just make their values `void'. */
417 int flag_cond_mismatch;
419 /* Nonzero means give `double' the same size as `float'. */
421 int flag_short_double;
423 /* Nonzero means don't recognize the keyword `asm'. */
427 /* Nonzero means don't recognize any builtin functions. */
431 /* Nonzero means don't recognize the non-ANSI builtin functions.
434 int flag_no_nonansi_builtin;
436 /* Nonzero means do some things the same way PCC does. */
438 int flag_traditional;
440 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
442 int flag_signed_bitfields = 1;
443 int explicit_flag_signed_bitfields = 0;
445 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
447 int flag_no_ident = 0;
449 /* Nonzero means warn about implicit declarations. */
453 /* Nonzero means give string constants the type `const char *'
454 to get extra warnings from them. These warnings will be too numerous
455 to be useful, except in thoroughly ANSIfied programs. */
457 int warn_write_strings;
459 /* Nonzero means warn about pointer casts that can drop a type qualifier
460 from the pointer target type. */
464 /* Warn about traditional constructs whose meanings changed in ANSI C. */
466 int warn_traditional;
468 /* Nonzero means warn about sizeof(function) or addition/subtraction
469 of function pointers. */
471 int warn_pointer_arith;
473 /* Nonzero means warn for non-prototype function decls
474 or non-prototyped defs without previous prototype. */
476 int warn_strict_prototypes;
478 /* Nonzero means warn for any global function def
479 without separate previous prototype decl. */
481 int warn_missing_prototypes;
483 /* Nonzero means warn about multiple (redundant) decls for the same single
484 variable or function. */
486 int warn_redundant_decls = 0;
488 /* Nonzero means warn about extern declarations of objects not at
489 file-scope level and about *all* declarations of functions (whether
490 extern or static) not at file-scope level. Note that we exclude
491 implicit function declarations. To get warnings about those, use
494 int warn_nested_externs = 0;
496 /* Warn about *printf or *scanf format/argument anomalies. */
500 /* Warn about a subscript that has type char. */
502 int warn_char_subscripts = 0;
504 /* Warn if a type conversion is done that might have confusing results. */
508 /* Warn if adding () is suggested. */
510 int warn_parentheses;
512 /* Warn if initializer is not completely bracketed. */
514 int warn_missing_braces;
516 /* Nonzero means `$' can be in an identifier.
517 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
519 #ifndef DOLLARS_IN_IDENTIFIERS
520 #define DOLLARS_IN_IDENTIFIERS 1
522 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
524 /* Decode the string P as a language-specific option for C.
525 Return 1 if it is recognized (and handle it);
526 return 0 if not recognized. */
532 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
534 flag_traditional = 1;
535 flag_writable_strings = 1;
536 #if DOLLARS_IN_IDENTIFIERS > 0
537 dollars_in_ident = 1;
540 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
542 flag_traditional = 0;
543 flag_writable_strings = 0;
544 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
546 else if (!strcmp (p, "-fdollars-in-identifiers"))
548 #if DOLLARS_IN_IDENTIFIERS > 0
549 dollars_in_ident = 1;
552 else if (!strcmp (p, "-fnodollars-in-identifiers"))
553 dollars_in_ident = 0;
554 else if (!strcmp (p, "-fsigned-char"))
555 flag_signed_char = 1;
556 else if (!strcmp (p, "-funsigned-char"))
557 flag_signed_char = 0;
558 else if (!strcmp (p, "-fno-signed-char"))
559 flag_signed_char = 0;
560 else if (!strcmp (p, "-fno-unsigned-char"))
561 flag_signed_char = 1;
562 else if (!strcmp (p, "-fsigned-bitfields")
563 || !strcmp (p, "-fno-unsigned-bitfields"))
565 flag_signed_bitfields = 1;
566 explicit_flag_signed_bitfields = 1;
568 else if (!strcmp (p, "-funsigned-bitfields")
569 || !strcmp (p, "-fno-signed-bitfields"))
571 flag_signed_bitfields = 0;
572 explicit_flag_signed_bitfields = 1;
574 else if (!strcmp (p, "-fshort-enums"))
575 flag_short_enums = 1;
576 else if (!strcmp (p, "-fno-short-enums"))
577 flag_short_enums = 0;
578 else if (!strcmp (p, "-fcond-mismatch"))
579 flag_cond_mismatch = 1;
580 else if (!strcmp (p, "-fno-cond-mismatch"))
581 flag_cond_mismatch = 0;
582 else if (!strcmp (p, "-fshort-double"))
583 flag_short_double = 1;
584 else if (!strcmp (p, "-fno-short-double"))
585 flag_short_double = 0;
586 else if (!strcmp (p, "-fasm"))
588 else if (!strcmp (p, "-fno-asm"))
590 else if (!strcmp (p, "-fbuiltin"))
592 else if (!strcmp (p, "-fno-builtin"))
594 else if (!strcmp (p, "-fno-ident"))
596 else if (!strcmp (p, "-fident"))
598 else if (!strcmp (p, "-ansi"))
599 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
600 else if (!strcmp (p, "-Wimplicit"))
602 else if (!strcmp (p, "-Wno-implicit"))
604 else if (!strcmp (p, "-Wwrite-strings"))
605 warn_write_strings = 1;
606 else if (!strcmp (p, "-Wno-write-strings"))
607 warn_write_strings = 0;
608 else if (!strcmp (p, "-Wcast-qual"))
610 else if (!strcmp (p, "-Wno-cast-qual"))
612 else if (!strcmp (p, "-Wpointer-arith"))
613 warn_pointer_arith = 1;
614 else if (!strcmp (p, "-Wno-pointer-arith"))
615 warn_pointer_arith = 0;
616 else if (!strcmp (p, "-Wstrict-prototypes"))
617 warn_strict_prototypes = 1;
618 else if (!strcmp (p, "-Wno-strict-prototypes"))
619 warn_strict_prototypes = 0;
620 else if (!strcmp (p, "-Wmissing-prototypes"))
621 warn_missing_prototypes = 1;
622 else if (!strcmp (p, "-Wno-missing-prototypes"))
623 warn_missing_prototypes = 0;
624 else if (!strcmp (p, "-Wredundant-decls"))
625 warn_redundant_decls = 1;
626 else if (!strcmp (p, "-Wno-redundant-decls"))
627 warn_redundant_decls = 0;
628 else if (!strcmp (p, "-Wnested-externs"))
629 warn_nested_externs = 1;
630 else if (!strcmp (p, "-Wno-nested-externs"))
631 warn_nested_externs = 0;
632 else if (!strcmp (p, "-Wtraditional"))
633 warn_traditional = 1;
634 else if (!strcmp (p, "-Wno-traditional"))
635 warn_traditional = 0;
636 else if (!strcmp (p, "-Wformat"))
638 else if (!strcmp (p, "-Wno-format"))
640 else if (!strcmp (p, "-Wchar-subscripts"))
641 warn_char_subscripts = 1;
642 else if (!strcmp (p, "-Wno-char-subscripts"))
643 warn_char_subscripts = 0;
644 else if (!strcmp (p, "-Wconversion"))
646 else if (!strcmp (p, "-Wno-conversion"))
648 else if (!strcmp (p, "-Wparentheses"))
649 warn_parentheses = 1;
650 else if (!strcmp (p, "-Wno-parentheses"))
651 warn_parentheses = 0;
652 else if (!strcmp (p, "-Wreturn-type"))
653 warn_return_type = 1;
654 else if (!strcmp (p, "-Wno-return-type"))
655 warn_return_type = 0;
656 else if (!strcmp (p, "-Wcomment"))
657 ; /* cpp handles this one. */
658 else if (!strcmp (p, "-Wno-comment"))
659 ; /* cpp handles this one. */
660 else if (!strcmp (p, "-Wcomments"))
661 ; /* cpp handles this one. */
662 else if (!strcmp (p, "-Wno-comments"))
663 ; /* cpp handles this one. */
664 else if (!strcmp (p, "-Wtrigraphs"))
665 ; /* cpp handles this one. */
666 else if (!strcmp (p, "-Wno-trigraphs"))
667 ; /* cpp handles this one. */
668 else if (!strcmp (p, "-Wimport"))
669 ; /* cpp handles this one. */
670 else if (!strcmp (p, "-Wno-import"))
671 ; /* cpp handles this one. */
672 else if (!strcmp (p, "-Wmissing-braces"))
673 warn_missing_braces = 1;
674 else if (!strcmp (p, "-Wno-missing-braces"))
675 warn_missing_braces = 0;
676 else if (!strcmp (p, "-Wall"))
679 /* We save the value of warn_uninitialized, since if they put
680 -Wuninitialized on the command line, we need to generate a
681 warning about not using it without also specifying -O. */
682 if (warn_uninitialized != 1)
683 warn_uninitialized = 2;
685 warn_return_type = 1;
689 warn_char_subscripts = 1;
690 warn_parentheses = 1;
691 warn_missing_braces = 1;
699 /* Hooks for print_node. */
702 print_lang_decl (file, node, indent)
710 print_lang_type (file, node, indent)
718 print_lang_identifier (file, node, indent)
723 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
724 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
725 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
726 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
727 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
728 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
731 /* Hook called at end of compilation to assume 1 elt
732 for a top-level array decl that wasn't complete before. */
735 finish_incomplete_decl (decl)
738 if (TREE_CODE (decl) == VAR_DECL && TREE_TYPE (decl) != error_mark_node)
740 tree type = TREE_TYPE (decl);
741 if (TREE_CODE (type) == ARRAY_TYPE
742 && TYPE_DOMAIN (type) == 0
743 && TREE_CODE (decl) != TYPE_DECL)
745 complete_array_type (type, NULL_TREE, 1);
747 layout_decl (decl, 0);
752 /* Create a new `struct binding_level'. */
755 struct binding_level *
756 make_binding_level ()
759 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
762 /* Nonzero if we are currently in the global binding level. */
767 return current_binding_level == global_binding_level;
773 keep_next_level_flag = 1;
776 /* Nonzero if the current level needs to have a BLOCK made. */
781 return ((current_binding_level->keep_if_subblocks
782 && current_binding_level->blocks != 0)
783 || current_binding_level->keep
784 || current_binding_level->names != 0
785 || (current_binding_level->tags != 0
786 && !current_binding_level->tag_transparent));
789 /* Identify this binding level as a level of parameters.
790 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
791 But it turns out there is no way to pass the right value for
792 DEFINITION_FLAG, so we ignore it. */
795 declare_parm_level (definition_flag)
798 current_binding_level->parm_flag = 1;
801 /* Nonzero if currently making parm declarations. */
806 return current_binding_level->parm_flag;
809 /* Enter a new binding level.
810 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
811 not for that of tags. */
814 pushlevel (tag_transparent)
817 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
819 /* If this is the top level of a function,
820 just make sure that NAMED_LABELS is 0. */
822 if (current_binding_level == global_binding_level)
827 /* Reuse or create a struct for this binding level. */
829 if (free_binding_level)
831 newlevel = free_binding_level;
832 free_binding_level = free_binding_level->level_chain;
836 newlevel = make_binding_level ();
839 /* Add this level to the front of the chain (stack) of levels that
842 *newlevel = clear_binding_level;
843 newlevel->tag_transparent
845 || (current_binding_level
846 ? current_binding_level->subblocks_tag_transparent
848 newlevel->level_chain = current_binding_level;
849 current_binding_level = newlevel;
850 newlevel->keep = keep_next_level_flag;
851 keep_next_level_flag = 0;
852 newlevel->keep_if_subblocks = keep_next_if_subblocks;
853 keep_next_if_subblocks = 0;
856 /* Exit a binding level.
857 Pop the level off, and restore the state of the identifier-decl mappings
858 that were in effect when this level was entered.
860 If KEEP is nonzero, this level had explicit declarations, so
861 and create a "block" (a BLOCK node) for the level
862 to record its declarations and subblocks for symbol table output.
864 If FUNCTIONBODY is nonzero, this level is the body of a function,
865 so create a block as if KEEP were set and also clear out all
868 If REVERSE is nonzero, reverse the order of decls before putting
869 them into the BLOCK. */
872 poplevel (keep, reverse, functionbody)
878 /* The chain of decls was accumulated in reverse order.
879 Put it into forward order, just for cleanliness. */
881 tree tags = current_binding_level->tags;
882 tree subblocks = current_binding_level->blocks;
885 int block_previously_created;
887 keep |= current_binding_level->keep;
889 /* This warning is turned off because it causes warnings for
890 declarations like `extern struct foo *x'. */
892 /* Warn about incomplete structure types in this level. */
893 for (link = tags; link; link = TREE_CHAIN (link))
894 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
896 tree type = TREE_VALUE (link);
898 switch (TREE_CODE (type))
901 errmsg = "`struct %s' incomplete in scope ending here";
904 errmsg = "`union %s' incomplete in scope ending here";
907 errmsg = "`enum %s' incomplete in scope ending here";
910 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
911 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
913 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
914 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
918 /* Get the decls in the order they were written.
919 Usually current_binding_level->names is in reverse order.
920 But parameter decls were previously put in forward order. */
923 current_binding_level->names
924 = decls = nreverse (current_binding_level->names);
926 decls = current_binding_level->names;
928 /* Output any nested inline functions within this block
929 if they weren't already output. */
931 for (decl = decls; decl; decl = TREE_CHAIN (decl))
932 if (TREE_CODE (decl) == FUNCTION_DECL
933 && ! TREE_ASM_WRITTEN (decl)
934 && DECL_INITIAL (decl) != 0
935 && TREE_ADDRESSABLE (decl))
937 /* If this decl was copied from a file-scope decl
938 on account of a block-scope extern decl,
939 propagate TREE_ADDRESSABLE to the file-scope decl. */
940 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
941 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
944 push_function_context ();
945 output_inline_function (decl);
946 pop_function_context ();
950 /* If there were any declarations or structure tags in that level,
951 or if this level is a function body,
952 create a BLOCK to record them for the life of this function. */
955 block_previously_created = (current_binding_level->this_block != 0);
956 if (block_previously_created)
957 block = current_binding_level->this_block;
958 else if (keep || functionbody
959 || (current_binding_level->keep_if_subblocks && subblocks != 0))
960 block = make_node (BLOCK);
963 BLOCK_VARS (block) = decls;
964 BLOCK_TYPE_TAGS (block) = tags;
965 BLOCK_SUBBLOCKS (block) = subblocks;
966 remember_end_note (block);
969 /* In each subblock, record that this is its superior. */
971 for (link = subblocks; link; link = TREE_CHAIN (link))
972 BLOCK_SUPERCONTEXT (link) = block;
974 /* Clear out the meanings of the local variables of this level. */
976 for (link = decls; link; link = TREE_CHAIN (link))
978 if (DECL_NAME (link) != 0)
980 /* If the ident. was used or addressed via a local extern decl,
981 don't forget that fact. */
982 if (DECL_EXTERNAL (link))
984 if (TREE_USED (link))
985 TREE_USED (DECL_NAME (link)) = 1;
986 if (TREE_ADDRESSABLE (link))
987 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
989 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
993 /* Restore all name-meanings of the outer levels
994 that were shadowed by this level. */
996 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
997 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
999 /* If the level being exited is the top level of a function,
1000 check over all the labels, and clear out the current
1001 (function local) meanings of their names. */
1005 /* If this is the top level block of a function,
1006 the vars are the function's parameters.
1007 Don't leave them in the BLOCK because they are
1008 found in the FUNCTION_DECL instead. */
1010 BLOCK_VARS (block) = 0;
1012 /* Clear out the definitions of all label names,
1013 since their scopes end here,
1014 and add them to BLOCK_VARS. */
1016 for (link = named_labels; link; link = TREE_CHAIN (link))
1018 register tree label = TREE_VALUE (link);
1020 if (DECL_INITIAL (label) == 0)
1022 error_with_decl (label, "label `%s' used but not defined");
1023 /* Avoid crashing later. */
1024 define_label (input_filename, lineno,
1027 else if (warn_unused && !TREE_USED (label))
1028 warning_with_decl (label, "label `%s' defined but not used");
1029 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1031 /* Put the labels into the "variables" of the
1032 top-level block, so debugger can see them. */
1033 TREE_CHAIN (label) = BLOCK_VARS (block);
1034 BLOCK_VARS (block) = label;
1038 /* Pop the current level, and free the structure for reuse. */
1041 register struct binding_level *level = current_binding_level;
1042 current_binding_level = current_binding_level->level_chain;
1044 level->level_chain = free_binding_level;
1045 free_binding_level = level;
1048 /* Dispose of the block that we just made inside some higher level. */
1050 DECL_INITIAL (current_function_decl) = block;
1053 if (!block_previously_created)
1054 current_binding_level->blocks
1055 = chainon (current_binding_level->blocks, block);
1057 /* If we did not make a block for the level just exited,
1058 any blocks made for inner levels
1059 (since they cannot be recorded as subblocks in that level)
1060 must be carried forward so they will later become subblocks
1061 of something else. */
1063 current_binding_level->blocks
1064 = chainon (current_binding_level->blocks, subblocks);
1066 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1067 binding contour so that they point to the appropriate construct, i.e.
1068 either to the current FUNCTION_DECL node, or else to the BLOCK node
1069 we just constructed.
1071 Note that for tagged types whose scope is just the formal parameter
1072 list for some function type specification, we can't properly set
1073 their TYPE_CONTEXTs here, because we don't have a pointer to the
1074 appropriate FUNCTION_TYPE node readily available to us. For those
1075 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1076 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1077 node which will represent the "scope" for these "parameter list local"
1082 for (link = tags; link; link = TREE_CHAIN (link))
1083 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1085 for (link = tags; link; link = TREE_CHAIN (link))
1086 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1089 TREE_USED (block) = 1;
1093 /* Delete the node BLOCK from the current binding level.
1094 This is used for the block inside a stmt expr ({...})
1095 so that the block can be reinserted where appropriate. */
1098 delete_block (block)
1102 if (current_binding_level->blocks == block)
1103 current_binding_level->blocks = TREE_CHAIN (block);
1104 for (t = current_binding_level->blocks; t;)
1106 if (TREE_CHAIN (t) == block)
1107 TREE_CHAIN (t) = TREE_CHAIN (block);
1111 TREE_CHAIN (block) = NULL;
1112 /* Clear TREE_USED which is always set by poplevel.
1113 The flag is set again if insert_block is called. */
1114 TREE_USED (block) = 0;
1117 /* Insert BLOCK at the end of the list of subblocks of the
1118 current binding level. This is used when a BIND_EXPR is expanded,
1119 to handle the BLOCK node inside the BIND_EXPR. */
1122 insert_block (block)
1125 TREE_USED (block) = 1;
1126 current_binding_level->blocks
1127 = chainon (current_binding_level->blocks, block);
1130 /* Set the BLOCK node for the innermost scope
1131 (the one we are currently in). */
1135 register tree block;
1137 current_binding_level->this_block = block;
1143 register struct binding_level *newlevel;
1145 /* Reuse or create a struct for this binding level. */
1147 if (free_binding_level)
1149 newlevel = free_binding_level;
1150 free_binding_level = free_binding_level->level_chain;
1154 newlevel = make_binding_level ();
1157 /* Add this level to the front of the chain (stack) of label levels. */
1159 newlevel->level_chain = label_level_chain;
1160 label_level_chain = newlevel;
1162 newlevel->names = named_labels;
1163 newlevel->shadowed = shadowed_labels;
1165 shadowed_labels = 0;
1171 register struct binding_level *level = label_level_chain;
1174 /* Clear out the definitions of the declared labels in this level.
1175 Leave in the list any ordinary, non-declared labels. */
1176 for (link = named_labels, prev = 0; link;)
1178 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1180 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1182 error_with_decl (TREE_VALUE (link),
1183 "label `%s' used but not defined");
1184 /* Avoid crashing later. */
1185 define_label (input_filename, lineno,
1186 DECL_NAME (TREE_VALUE (link)));
1188 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1189 warning_with_decl (TREE_VALUE (link),
1190 "label `%s' defined but not used");
1191 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1193 /* Delete this element from the list. */
1194 link = TREE_CHAIN (link);
1196 TREE_CHAIN (prev) = link;
1198 named_labels = link;
1203 link = TREE_CHAIN (link);
1207 /* Bring back all the labels that were shadowed. */
1208 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1209 if (DECL_NAME (TREE_VALUE (link)) != 0)
1210 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1211 = TREE_VALUE (link);
1213 named_labels = chainon (named_labels, level->names);
1214 shadowed_labels = level->shadowed;
1216 /* Pop the current level, and free the structure for reuse. */
1217 label_level_chain = label_level_chain->level_chain;
1218 level->level_chain = free_binding_level;
1219 free_binding_level = level;
1222 /* Push a definition or a declaration of struct, union or enum tag "name".
1223 "type" should be the type node.
1224 We assume that the tag "name" is not already defined.
1226 Note that the definition may really be just a forward reference.
1227 In that case, the TYPE_SIZE will be zero. */
1230 pushtag (name, type)
1233 register struct binding_level *b;
1235 /* Find the proper binding level for this type tag. */
1237 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1242 /* Record the identifier as the type's name if it has none. */
1244 if (TYPE_NAME (type) == 0)
1245 TYPE_NAME (type) = name;
1248 if (b == global_binding_level)
1249 b->tags = perm_tree_cons (name, type, b->tags);
1251 b->tags = saveable_tree_cons (name, type, b->tags);
1253 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1254 tagged type we just added to the current binding level. This fake
1255 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1256 to output a representation of a tagged type, and it also gives
1257 us a convenient place to record the "scope start" address for the
1260 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1263 /* Handle when a new declaration NEWDECL
1264 has the same name as an old one OLDDECL
1265 in the same binding contour.
1266 Prints an error message if appropriate.
1268 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1269 Otherwise, return 0. */
1272 duplicate_decls (newdecl, olddecl)
1273 register tree newdecl, olddecl;
1275 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1276 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1277 && DECL_INITIAL (newdecl) != 0);
1278 tree oldtype = TREE_TYPE (olddecl);
1279 tree newtype = TREE_TYPE (newdecl);
1281 if (TREE_CODE (newtype) == ERROR_MARK
1282 || TREE_CODE (oldtype) == ERROR_MARK)
1285 /* New decl is completely inconsistent with the old one =>
1286 tell caller to replace the old one.
1287 This is always an error except in the case of shadowing a builtin. */
1288 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1290 if (TREE_CODE (olddecl) == FUNCTION_DECL
1291 && DECL_BUILT_IN (olddecl))
1293 /* If you declare a built-in function name as static, the
1294 built-in definition is overridden,
1295 but optionally warn this was a bad choice of name. */
1296 if (!TREE_PUBLIC (newdecl))
1299 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1301 /* Likewise, if the built-in is not ansi, then programs can
1302 override it even globally without an error. */
1303 else if (DECL_BUILT_IN_NONANSI (olddecl))
1304 warning_with_decl (newdecl,
1305 "built-in function `%s' declared as non-function");
1307 error_with_decl (newdecl,
1308 "built-in function `%s' declared as non-function");
1310 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1311 && DECL_BUILT_IN_NONANSI (olddecl))
1313 /* If overriding decl is static,
1314 optionally warn this was a bad choice of name. */
1315 if (!TREE_PUBLIC (newdecl))
1318 warning_with_decl (newdecl, "shadowing library function `%s'");
1320 /* Otherwise, always warn. */
1322 warning_with_decl (newdecl,
1323 "library function `%s' declared as non-function");
1327 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1328 error_with_decl (olddecl, "previous declaration of `%s'");
1334 /* For real parm decl following a forward decl,
1335 return 1 so old decl will be reused. */
1336 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1337 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1340 /* The new declaration is the same kind of object as the old one.
1341 The declarations may partially match. Print warnings if they don't
1342 match enough. Ultimately, copy most of the information from the new
1343 decl to the old one, and keep using the old one. */
1345 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1346 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1347 && DECL_INITIAL (olddecl) == 0)
1348 /* If -traditional, avoid error for redeclaring fcn
1349 after implicit decl. */
1351 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1352 && DECL_BUILT_IN (olddecl))
1354 /* A function declaration for a built-in function. */
1355 if (!TREE_PUBLIC (newdecl))
1357 /* If you declare a built-in function name as static, the
1358 built-in definition is overridden,
1359 but optionally warn this was a bad choice of name. */
1361 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1362 /* Discard the old built-in function. */
1365 else if (!types_match)
1367 /* Accept the return type of the new declaration if same modes. */
1368 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1369 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1370 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1372 /* Function types may be shared, so we can't just modify
1373 the return type of olddecl's function type. */
1375 = build_function_type (newreturntype,
1376 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1378 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1380 TREE_TYPE (olddecl) = newtype;
1382 /* Accept harmless mismatch in first argument type also.
1384 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1385 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0
1386 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))) != 0
1387 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))) != 0
1388 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))))
1390 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))))))
1392 /* Function types may be shared, so we can't just modify
1393 the return type of olddecl's function type. */
1395 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl)),
1396 tree_cons (NULL_TREE,
1397 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))),
1398 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl)))));
1400 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1402 TREE_TYPE (olddecl) = newtype;
1407 /* If types don't match for a built-in, throw away the built-in. */
1408 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1412 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1413 && DECL_SOURCE_LINE (olddecl) == 0)
1415 /* A function declaration for a predeclared function
1416 that isn't actually built in. */
1417 if (!TREE_PUBLIC (newdecl))
1419 /* If you declare it as static, the
1420 default definition is overridden. */
1423 else if (!types_match)
1425 /* If the types don't match, preserve volatility indication.
1426 Later on, we will discard everything else about the
1427 default declaration. */
1428 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1431 /* Permit char *foo () to match void *foo (...) if not pedantic,
1432 if one of them came from a system header file. */
1433 else if (!types_match
1434 && TREE_CODE (olddecl) == FUNCTION_DECL
1435 && TREE_CODE (newdecl) == FUNCTION_DECL
1436 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1437 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1438 && (DECL_IN_SYSTEM_HEADER (olddecl)
1439 || DECL_IN_SYSTEM_HEADER (newdecl))
1440 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1441 && TYPE_ARG_TYPES (oldtype) == 0
1442 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1443 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1445 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1446 && TYPE_ARG_TYPES (newtype) == 0
1447 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1448 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1451 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1452 /* Make sure we keep void * as ret type, not char *. */
1453 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1454 TREE_TYPE (newdecl) = newtype = oldtype;
1456 else if (!types_match
1457 /* Permit char *foo (int, ...); followed by char *foo ();
1459 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1461 /* Return types must still match. */
1462 && comptypes (TREE_TYPE (oldtype),
1463 TREE_TYPE (newtype))
1464 && TYPE_ARG_TYPES (newtype) == 0))
1466 error_with_decl (newdecl, "conflicting types for `%s'");
1467 /* Check for function type mismatch
1468 involving an empty arglist vs a nonempty one. */
1469 if (TREE_CODE (olddecl) == FUNCTION_DECL
1470 && comptypes (TREE_TYPE (oldtype),
1471 TREE_TYPE (newtype))
1472 && ((TYPE_ARG_TYPES (oldtype) == 0
1473 && DECL_INITIAL (olddecl) == 0)
1475 (TYPE_ARG_TYPES (newtype) == 0
1476 && DECL_INITIAL (newdecl) == 0)))
1478 /* Classify the problem further. */
1479 register tree t = TYPE_ARG_TYPES (oldtype);
1481 t = TYPE_ARG_TYPES (newtype);
1482 for (; t; t = TREE_CHAIN (t))
1484 register tree type = TREE_VALUE (t);
1486 if (TREE_CHAIN (t) == 0
1487 && TYPE_MAIN_VARIANT (type) != void_type_node)
1489 error ("A parameter list with an ellipsis can't match");
1490 error ("an empty parameter name list declaration.");
1494 if (TYPE_MAIN_VARIANT (type) == float_type_node
1495 || C_PROMOTING_INTEGER_TYPE_P (type))
1497 error ("An argument type that has a default promotion");
1498 error ("can't match an empty parameter name list declaration.");
1503 error_with_decl (olddecl, "previous declaration of `%s'");
1507 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1510 error_with_decl (newdecl, errmsg);
1511 error_with_decl (olddecl,
1512 ((DECL_INITIAL (olddecl)
1513 && current_binding_level == global_binding_level)
1514 ? "`%s' previously defined here"
1515 : "`%s' previously declared here"));
1517 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1518 && DECL_INITIAL (olddecl) != 0
1519 && TYPE_ARG_TYPES (oldtype) == 0
1520 && TYPE_ARG_TYPES (newtype) != 0)
1522 register tree type, parm;
1524 /* Prototype decl follows defn w/o prototype. */
1526 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1527 type = TYPE_ARG_TYPES (newtype),
1529 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1530 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1531 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1533 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1534 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1536 errmsg = "prototype for `%s' follows and number of arguments";
1539 /* Type for passing arg must be consistent
1540 with that declared for the arg. */
1541 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1542 /* If -traditional, allow `unsigned int' instead of `int'
1543 in the prototype. */
1544 && (! (flag_traditional
1545 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1546 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1548 errmsg = "prototype for `%s' follows and argument %d";
1554 error_with_decl (newdecl, errmsg, nargs);
1555 error_with_decl (olddecl,
1556 "doesn't match non-prototype definition here");
1560 warning_with_decl (newdecl, "prototype for `%s' follows");
1561 warning_with_decl (olddecl, "non-prototype definition here");
1564 /* Warn about mismatches in various flags. */
1567 /* Warn if function is now inline
1568 but was previously declared not inline and has been called. */
1569 if (TREE_CODE (olddecl) == FUNCTION_DECL
1570 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1571 && TREE_USED (olddecl))
1572 warning_with_decl (newdecl,
1573 "`%s' declared inline after being called");
1574 if (TREE_CODE (olddecl) == FUNCTION_DECL
1575 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1576 && DECL_INITIAL (olddecl) != 0)
1577 warning_with_decl (newdecl,
1578 "`%s' declared inline after its definition");
1579 /* It is nice to warn when a function is declared
1580 global first and then static. */
1581 if (TREE_CODE (olddecl) == FUNCTION_DECL
1582 && TREE_PUBLIC (olddecl)
1583 && !TREE_PUBLIC (newdecl))
1584 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1586 /* These bits are logically part of the type, for variables.
1587 But not for functions
1588 (where qualifiers are not valid ANSI anyway). */
1589 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1590 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1591 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1592 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1596 /* Optionally warn about more than one declaration for the same name. */
1597 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1598 /* Dont warn about a function declaration
1599 followed by a definition. */
1600 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1601 && DECL_INITIAL (olddecl) == 0)
1602 /* Don't warn about extern decl followed by (tentative) definition. */
1603 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1605 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1606 warning_with_decl (olddecl, "previous declaration of `%s'");
1609 /* Copy all the DECL_... slots specified in the new decl
1610 except for any that we copy here from the old type.
1612 Past this point, we don't change OLDTYPE and NEWTYPE
1613 even if we change the types of NEWDECL and OLDDECL. */
1617 /* Merge the data types specified in the two decls. */
1618 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1620 = TREE_TYPE (olddecl)
1621 = common_type (newtype, oldtype);
1623 /* Lay the type out, unless already done. */
1624 if (oldtype != TREE_TYPE (newdecl))
1626 if (TREE_TYPE (newdecl) != error_mark_node)
1627 layout_type (TREE_TYPE (newdecl));
1628 if (TREE_CODE (newdecl) != FUNCTION_DECL
1629 && TREE_CODE (newdecl) != TYPE_DECL
1630 && TREE_CODE (newdecl) != CONST_DECL)
1631 layout_decl (newdecl, 0);
1635 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1636 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1637 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1638 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1639 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1642 /* Keep the old rtl since we can safely use it. */
1643 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1645 /* Merge the type qualifiers. */
1646 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1647 && !TREE_THIS_VOLATILE (newdecl))
1648 TREE_THIS_VOLATILE (olddecl) = 0;
1649 if (TREE_READONLY (newdecl))
1650 TREE_READONLY (olddecl) = 1;
1651 if (TREE_THIS_VOLATILE (newdecl))
1653 TREE_THIS_VOLATILE (olddecl) = 1;
1654 if (TREE_CODE (newdecl) == VAR_DECL)
1655 make_var_volatile (newdecl);
1658 /* Keep source location of definition rather than declaration. */
1659 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1661 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1662 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1665 /* Merge the unused-warning information. */
1666 if (DECL_IN_SYSTEM_HEADER (olddecl))
1667 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1668 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1669 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1671 /* Merge the initialization information. */
1672 if (DECL_INITIAL (newdecl) == 0)
1673 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1675 /* If cannot merge, then use the new type and qualifiers,
1676 and don't preserve the old rtl. */
1679 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1680 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1681 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1682 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1685 /* Merge the storage class information. */
1686 /* For functions, static overrides non-static. */
1687 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1689 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1690 /* This is since we don't automatically
1691 copy the attributes of NEWDECL into OLDDECL. */
1692 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1693 /* If this clears `static', clear it in the identifier too. */
1694 if (! TREE_PUBLIC (olddecl))
1695 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1697 if (DECL_EXTERNAL (newdecl))
1699 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1700 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1701 /* An extern decl does not override previous storage class. */
1702 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1706 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1707 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1710 /* If either decl says `inline', this fn is inline,
1711 unless its definition was passed already. */
1712 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1713 DECL_INLINE (olddecl) = 1;
1714 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1716 /* Get rid of any built-in function if new arg types don't match it
1717 or if we have a function definition. */
1718 if (TREE_CODE (newdecl) == FUNCTION_DECL
1719 && DECL_BUILT_IN (olddecl)
1720 && (!types_match || new_is_definition))
1722 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1723 DECL_BUILT_IN (olddecl) = 0;
1726 /* If redeclaring a builtin function, and not a definition,
1728 Also preserve various other info from the definition. */
1729 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1731 if (DECL_BUILT_IN (olddecl))
1733 DECL_BUILT_IN (newdecl) = 1;
1734 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1737 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1739 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1740 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1741 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1742 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1745 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1746 But preserve OLDdECL's DECL_UID. */
1748 register unsigned olddecl_uid = DECL_UID (olddecl);
1750 bcopy ((char *) newdecl + sizeof (struct tree_common),
1751 (char *) olddecl + sizeof (struct tree_common),
1752 sizeof (struct tree_decl) - sizeof (struct tree_common));
1753 DECL_UID (olddecl) = olddecl_uid;
1759 /* Record a decl-node X as belonging to the current lexical scope.
1760 Check for errors (such as an incompatible declaration for the same
1761 name already seen in the same scope).
1763 Returns either X or an old decl for the same name.
1764 If an old decl is returned, it may have been smashed
1765 to agree with what X says. */
1772 register tree name = DECL_NAME (x);
1773 register struct binding_level *b = current_binding_level;
1775 DECL_CONTEXT (x) = current_function_decl;
1776 /* A local extern declaration for a function doesn't constitute nesting.
1777 A local auto declaration does, since it's a forward decl
1778 for a nested function coming later. */
1779 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1780 && DECL_EXTERNAL (x))
1781 DECL_CONTEXT (x) = 0;
1783 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1784 && x != IDENTIFIER_IMPLICIT_DECL (name)
1785 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1786 && !DECL_IN_SYSTEM_HEADER (x))
1787 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1794 t = lookup_name_current_level (name);
1795 if (t != 0 && t == error_mark_node)
1796 /* error_mark_node is 0 for a while during initialization! */
1799 error_with_decl (x, "`%s' used prior to declaration");
1804 file = DECL_SOURCE_FILE (t);
1805 line = DECL_SOURCE_LINE (t);
1808 if (t != 0 && duplicate_decls (x, t))
1810 if (TREE_CODE (t) == PARM_DECL)
1812 /* Don't allow more than one "real" duplicate
1813 of a forward parm decl. */
1814 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1817 /* If this decl is `static' and an implicit decl was seen previously,
1818 warn. But don't complain if -traditional,
1819 since traditional compilers don't complain. */
1820 if (!flag_traditional && TREE_PUBLIC (name)
1821 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1822 /* We used to warn also for explicit extern followed by static,
1823 but sometimes you need to do it that way. */
1824 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1826 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1827 IDENTIFIER_POINTER (name));
1828 pedwarn_with_file_and_line (file, line,
1829 "previous declaration of `%s'",
1830 IDENTIFIER_POINTER (name));
1836 /* If we are processing a typedef statement, generate a whole new
1837 ..._TYPE node (which will be just an variant of the existing
1838 ..._TYPE node with identical properties) and then install the
1839 TYPE_DECL node generated to represent the typedef name as the
1840 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1842 The whole point here is to end up with a situation where each
1843 and every ..._TYPE node the compiler creates will be uniquely
1844 associated with AT MOST one node representing a typedef name.
1845 This way, even though the compiler substitutes corresponding
1846 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1847 early on, later parts of the compiler can always do the reverse
1848 translation and get back the corresponding typedef name. For
1851 typedef struct S MY_TYPE;
1854 Later parts of the compiler might only know that `object' was of
1855 type `struct S' if if were not for code just below. With this
1856 code however, later parts of the compiler see something like:
1858 struct S' == struct S
1859 typedef struct S' MY_TYPE;
1862 And they can then deduce (from the node for type struct S') that
1863 the original object declaration was:
1867 Being able to do this is important for proper support of protoize,
1868 and also for generating precise symbolic debugging information
1869 which takes full account of the programmer's (typedef) vocabulary.
1871 Obviously, we don't want to generate a duplicate ..._TYPE node if
1872 the TYPE_DECL node that we are now processing really represents a
1873 standard built-in type.
1875 Since all standard types are effectively declared at line zero
1876 in the source file, we can easily check to see if we are working
1877 on a standard type by checking the current value of lineno. */
1879 if (TREE_CODE (x) == TYPE_DECL)
1881 if (DECL_SOURCE_LINE (x) == 0)
1883 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1884 TYPE_NAME (TREE_TYPE (x)) = x;
1886 else if (TREE_TYPE (x) != error_mark_node)
1888 tree tt = TREE_TYPE (x);
1890 tt = build_type_copy (tt);
1896 /* Multiple external decls of the same identifier ought to match.
1897 Check against both global declarations and out of scope (limbo) block
1900 We get warnings about inline functions where they are defined.
1901 Avoid duplicate warnings where they are used. */
1902 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
1906 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1907 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1908 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1909 decl = IDENTIFIER_GLOBAL_VALUE (name);
1910 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1911 /* Decls in limbo are always extern, so no need to check that. */
1912 decl = IDENTIFIER_LIMBO_VALUE (name);
1916 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1917 /* If old decl is built-in, we already warned if we should. */
1918 && !DECL_BUILT_IN (decl))
1920 pedwarn_with_decl (x,
1921 "type mismatch with previous external decl");
1922 pedwarn_with_decl (decl, "previous external decl of `%s'");
1926 /* If a function has had an implicit declaration, and then is defined,
1927 make sure they are compatible. */
1929 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1930 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1931 && TREE_CODE (x) == FUNCTION_DECL
1932 && ! comptypes (TREE_TYPE (x),
1933 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1935 warning_with_decl (x, "type mismatch with previous implicit declaration");
1936 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1937 "previous implicit declaration of `%s'");
1940 /* In PCC-compatibility mode, extern decls of vars with no current decl
1941 take effect at top level no matter where they are. */
1942 if (flag_traditional && DECL_EXTERNAL (x)
1943 && lookup_name (name) == 0)
1945 tree type = TREE_TYPE (x);
1947 /* But don't do this if the type contains temporary nodes. */
1950 if (type == error_mark_node)
1952 if (! TREE_PERMANENT (type))
1954 warning_with_decl (x, "type of external `%s' is not global");
1955 /* By exiting the loop early, we leave TYPE nonzero,
1956 and thus prevent globalization of the decl. */
1959 else if (TREE_CODE (type) == FUNCTION_TYPE
1960 && TYPE_ARG_TYPES (type) != 0)
1961 /* The types might not be truly local,
1962 but the list of arg types certainly is temporary.
1963 Since prototypes are nontraditional,
1964 ok not to do the traditional thing. */
1966 type = TREE_TYPE (type);
1970 b = global_binding_level;
1973 /* This name is new in its binding level.
1974 Install the new declaration and return it. */
1975 if (b == global_binding_level)
1977 /* Install a global value. */
1979 /* If the first global decl has external linkage,
1980 warn if we later see static one. */
1981 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1982 TREE_PUBLIC (name) = 1;
1984 IDENTIFIER_GLOBAL_VALUE (name) = x;
1986 /* We no longer care about any previous block level declarations. */
1987 IDENTIFIER_LIMBO_VALUE (name) = 0;
1989 /* Don't forget if the function was used via an implicit decl. */
1990 if (IDENTIFIER_IMPLICIT_DECL (name)
1991 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1992 TREE_USED (x) = 1, TREE_USED (name) = 1;
1994 /* Don't forget if its address was taken in that way. */
1995 if (IDENTIFIER_IMPLICIT_DECL (name)
1996 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1997 TREE_ADDRESSABLE (x) = 1;
1999 /* Warn about mismatches against previous implicit decl. */
2000 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2001 /* If this real decl matches the implicit, don't complain. */
2002 && ! (TREE_CODE (x) == FUNCTION_DECL
2003 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2004 == integer_type_node)))
2005 pedwarn ("`%s' was previously implicitly declared to return `int'",
2006 IDENTIFIER_POINTER (name));
2008 /* If this decl is `static' and an `extern' was seen previously,
2009 that is erroneous. */
2010 if (TREE_PUBLIC (name)
2011 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2013 /* Okay to redeclare an ANSI built-in as static. */
2014 if (t != 0 && DECL_BUILT_IN (t))
2016 /* Okay to declare a non-ANSI built-in as anything. */
2017 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2019 else if (IDENTIFIER_IMPLICIT_DECL (name))
2020 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2021 IDENTIFIER_POINTER (name));
2023 pedwarn ("`%s' was declared `extern' and later `static'",
2024 IDENTIFIER_POINTER (name));
2029 /* Here to install a non-global value. */
2030 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2031 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2032 IDENTIFIER_LOCAL_VALUE (name) = x;
2034 /* If this is an extern function declaration, see if we
2035 have a global definition or declaration for the function. */
2037 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2039 && TREE_CODE (x) == FUNCTION_DECL
2040 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2042 /* We have one. Their types must agree. */
2043 if (! comptypes (TREE_TYPE (x),
2044 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2045 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2048 /* Inner extern decl is inline if global one is.
2049 Copy enough to really inline it. */
2050 if (DECL_INLINE (oldglobal))
2052 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2053 DECL_INITIAL (x) = (current_function_decl == oldglobal
2054 ? 0 : DECL_INITIAL (oldglobal));
2055 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2056 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2057 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2058 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2059 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2060 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2062 /* Inner extern decl is built-in if global one is. */
2063 if (DECL_BUILT_IN (oldglobal))
2065 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2066 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
2068 /* Keep the arg types from a file-scope fcn defn. */
2069 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2070 && DECL_INITIAL (oldglobal)
2071 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2072 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2076 #if 0 /* This case is probably sometimes the right thing to do. */
2077 /* If we have a local external declaration,
2078 then any file-scope declaration should not
2079 have been static. */
2080 if (oldlocal == 0 && oldglobal != 0
2081 && !TREE_PUBLIC (oldglobal)
2082 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2083 warning ("`%s' locally external but globally static",
2084 IDENTIFIER_POINTER (name));
2087 /* If we have a local external declaration,
2088 and no file-scope declaration has yet been seen,
2089 then if we later have a file-scope decl it must not be static. */
2092 && DECL_EXTERNAL (x)
2095 TREE_PUBLIC (name) = 1;
2097 /* Save this decl, so that we can do type checking against
2098 other decls after it falls out of scope.
2100 Only save it once. This prevents temporary decls created in
2101 expand_inline_function from being used here, since this
2102 will have been set when the inline function was parsed.
2103 It also helps give slightly better warnings. */
2104 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2105 IDENTIFIER_LIMBO_VALUE (name) = x;
2108 /* Warn if shadowing an argument at the top level of the body. */
2109 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2110 /* This warning doesn't apply to the parms of a nested fcn. */
2111 && ! current_binding_level->parm_flag
2112 /* Check that this is one level down from the parms. */
2113 && current_binding_level->level_chain->parm_flag
2114 /* Check that the decl being shadowed
2115 comes from the parm level, one level up. */
2116 && chain_member (oldlocal, current_binding_level->level_chain->names))
2118 if (TREE_CODE (oldlocal) == PARM_DECL)
2119 pedwarn ("declaration of `%s' shadows a parameter",
2120 IDENTIFIER_POINTER (name));
2122 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2123 IDENTIFIER_POINTER (name));
2126 /* Maybe warn if shadowing something else. */
2127 else if (warn_shadow && !DECL_EXTERNAL (x)
2128 /* No shadow warnings for internally generated vars. */
2129 && DECL_SOURCE_LINE (x) != 0
2130 /* No shadow warnings for vars made for inlining. */
2131 && ! DECL_FROM_INLINE (x))
2133 char *warnstring = 0;
2135 if (TREE_CODE (x) == PARM_DECL
2136 && current_binding_level->level_chain->parm_flag)
2137 /* Don't warn about the parm names in function declarator
2138 within a function declarator.
2139 It would be nice to avoid warning in any function
2140 declarator in a declaration, as opposed to a definition,
2141 but there is no way to tell it's not a definition. */
2143 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2144 warnstring = "declaration of `%s' shadows a parameter";
2145 else if (oldlocal != 0)
2146 warnstring = "declaration of `%s' shadows previous local";
2147 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2148 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2149 warnstring = "declaration of `%s' shadows global declaration";
2152 warning (warnstring, IDENTIFIER_POINTER (name));
2155 /* If storing a local value, there may already be one (inherited).
2156 If so, record it for restoration when this binding level ends. */
2158 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2161 /* Keep count of variables in this level with incomplete type. */
2162 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2166 /* Put decls on list in reverse order.
2167 We will reverse them later if necessary. */
2168 TREE_CHAIN (x) = b->names;
2174 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2177 pushdecl_top_level (x)
2181 register struct binding_level *b = current_binding_level;
2183 current_binding_level = global_binding_level;
2185 current_binding_level = b;
2189 /* Generate an implicit declaration for identifier FUNCTIONID
2190 as a function of type int (). Print a warning if appropriate. */
2193 implicitly_declare (functionid)
2197 int traditional_warning = 0;
2198 /* Only one "implicit declaration" warning per identifier. */
2199 int implicit_warning;
2201 /* Save the decl permanently so we can warn if definition follows. */
2202 push_obstacks_nochange ();
2203 end_temporary_allocation ();
2205 /* We used to reuse an old implicit decl here,
2206 but this loses with inline functions because it can clobber
2207 the saved decl chains. */
2208 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2209 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2211 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2213 /* Warn of implicit decl following explicit local extern decl.
2214 This is probably a program designed for traditional C. */
2215 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2216 traditional_warning = 1;
2218 /* Warn once of an implicit declaration. */
2219 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2221 DECL_EXTERNAL (decl) = 1;
2222 TREE_PUBLIC (decl) = 1;
2224 /* Record that we have an implicit decl and this is it. */
2225 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2227 /* ANSI standard says implicit declarations are in the innermost block.
2228 So we record the decl in the standard fashion.
2229 If flag_traditional is set, pushdecl does it top-level. */
2232 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2233 maybe_objc_check_decl (decl);
2235 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2237 if (warn_implicit && implicit_warning)
2238 warning ("implicit declaration of function `%s'",
2239 IDENTIFIER_POINTER (functionid));
2240 else if (warn_traditional && traditional_warning)
2241 warning ("function `%s' was previously declared within a block",
2242 IDENTIFIER_POINTER (functionid));
2244 /* Write a record describing this implicit function declaration to the
2245 prototypes file (if requested). */
2247 gen_aux_info_record (decl, 0, 1, 0);
2254 /* Return zero if the declaration NEWDECL is valid
2255 when the declaration OLDDECL (assumed to be for the same name)
2256 has already been seen.
2257 Otherwise return an error message format string with a %s
2258 where the identifier should go. */
2261 redeclaration_error_message (newdecl, olddecl)
2262 tree newdecl, olddecl;
2264 if (TREE_CODE (newdecl) == TYPE_DECL)
2266 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2268 return "redefinition of `%s'";
2270 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2272 /* Declarations of functions can insist on internal linkage
2273 but they can't be inconsistent with internal linkage,
2274 so there can be no error on that account.
2275 However defining the same name twice is no good. */
2276 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2277 /* However, defining once as extern inline and a second
2278 time in another way is ok. */
2279 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2280 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2281 return "redefinition of `%s'";
2284 else if (current_binding_level == global_binding_level)
2286 /* Objects declared at top level: */
2287 /* If at least one is a reference, it's ok. */
2288 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2290 /* Reject two definitions. */
2291 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2292 return "redefinition of `%s'";
2293 /* Now we have two tentative defs, or one tentative and one real def. */
2294 /* Insist that the linkage match. */
2295 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2296 return "conflicting declarations of `%s'";
2299 else if (current_binding_level->parm_flag
2300 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2304 /* Objects declared with block scope: */
2305 /* Reject two definitions, and reject a definition
2306 together with an external reference. */
2307 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2308 return "redeclaration of `%s'";
2313 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2314 Create one if none exists so far for the current function.
2315 This function is called for both label definitions and label references. */
2321 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2323 if (current_function_decl == 0)
2325 error ("label %s referenced outside of any function",
2326 IDENTIFIER_POINTER (id));
2330 /* Use a label already defined or ref'd with this name. */
2333 /* But not if it is inherited and wasn't declared to be inheritable. */
2334 if (DECL_CONTEXT (decl) != current_function_decl
2335 && ! C_DECLARED_LABEL_FLAG (decl))
2336 return shadow_label (id);
2340 decl = build_decl (LABEL_DECL, id, void_type_node);
2342 /* Make sure every label has an rtx. */
2345 /* A label not explicitly declared must be local to where it's ref'd. */
2346 DECL_CONTEXT (decl) = current_function_decl;
2348 DECL_MODE (decl) = VOIDmode;
2350 /* Say where one reference is to the label,
2351 for the sake of the error if it is not defined. */
2352 DECL_SOURCE_LINE (decl) = lineno;
2353 DECL_SOURCE_FILE (decl) = input_filename;
2355 IDENTIFIER_LABEL_VALUE (id) = decl;
2357 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2362 /* Make a label named NAME in the current function,
2363 shadowing silently any that may be inherited from containing functions
2364 or containing scopes.
2366 Note that valid use, if the label being shadowed
2367 comes from another scope in the same function,
2368 requires calling declare_nonlocal_label right away. */
2374 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2378 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2379 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2382 return lookup_label (name);
2385 /* Define a label, specifying the location in the source file.
2386 Return the LABEL_DECL node for the label, if the definition is valid.
2387 Otherwise return 0. */
2390 define_label (filename, line, name)
2395 tree decl = lookup_label (name);
2397 /* If label with this name is known from an outer context, shadow it. */
2398 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2400 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2401 IDENTIFIER_LABEL_VALUE (name) = 0;
2402 decl = lookup_label (name);
2405 if (DECL_INITIAL (decl) != 0)
2407 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2412 /* Mark label as having been defined. */
2413 DECL_INITIAL (decl) = error_mark_node;
2414 /* Say where in the source. */
2415 DECL_SOURCE_FILE (decl) = filename;
2416 DECL_SOURCE_LINE (decl) = line;
2421 /* Return the list of declarations of the current level.
2422 Note that this list is in reverse order unless/until
2423 you nreverse it; and when you do nreverse it, you must
2424 store the result back using `storedecls' or you will lose. */
2429 return current_binding_level->names;
2432 /* Return the list of type-tags (for structs, etc) of the current level. */
2437 return current_binding_level->tags;
2440 /* Store the list of declarations of the current level.
2441 This is done for the parameter declarations of a function being defined,
2442 after they are modified in the light of any missing parameters. */
2448 current_binding_level->names = decls;
2451 /* Similarly, store the list of tags of the current level. */
2457 current_binding_level->tags = tags;
2460 /* Given NAME, an IDENTIFIER_NODE,
2461 return the structure (or union or enum) definition for that name.
2462 Searches binding levels from BINDING_LEVEL up to the global level.
2463 If THISLEVEL_ONLY is nonzero, searches only the specified context
2464 (but skips any tag-transparent contexts to find one that is
2465 meaningful for tags).
2466 CODE says which kind of type the caller wants;
2467 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2468 If the wrong kind of type is found, an error is reported. */
2471 lookup_tag (code, name, binding_level, thislevel_only)
2472 enum tree_code code;
2473 struct binding_level *binding_level;
2477 register struct binding_level *level;
2479 for (level = binding_level; level; level = level->level_chain)
2482 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2484 if (TREE_PURPOSE (tail) == name)
2486 if (TREE_CODE (TREE_VALUE (tail)) != code)
2488 /* Definition isn't the kind we were looking for. */
2489 pending_invalid_xref = name;
2490 pending_invalid_xref_file = input_filename;
2491 pending_invalid_xref_line = lineno;
2493 return TREE_VALUE (tail);
2496 if (thislevel_only && ! level->tag_transparent)
2502 /* Print an error message now
2503 for a recent invalid struct, union or enum cross reference.
2504 We don't print them immediately because they are not invalid
2505 when used in the `struct foo;' construct for shadowing. */
2508 pending_xref_error ()
2510 if (pending_invalid_xref != 0)
2511 error_with_file_and_line (pending_invalid_xref_file,
2512 pending_invalid_xref_line,
2513 "`%s' defined as wrong kind of tag",
2514 IDENTIFIER_POINTER (pending_invalid_xref));
2515 pending_invalid_xref = 0;
2518 /* Given a type, find the tag that was defined for it and return the tag name.
2519 Otherwise return 0. */
2522 lookup_tag_reverse (type)
2525 register struct binding_level *level;
2527 for (level = current_binding_level; level; level = level->level_chain)
2530 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2532 if (TREE_VALUE (tail) == type)
2533 return TREE_PURPOSE (tail);
2539 /* Look up NAME in the current binding level and its superiors
2540 in the namespace of variables, functions and typedefs.
2541 Return a ..._DECL node of some kind representing its definition,
2542 or return 0 if it is undefined. */
2549 if (current_binding_level != global_binding_level
2550 && IDENTIFIER_LOCAL_VALUE (name))
2551 val = IDENTIFIER_LOCAL_VALUE (name);
2553 val = IDENTIFIER_GLOBAL_VALUE (name);
2557 /* Similar to `lookup_name' but look only at current binding level. */
2560 lookup_name_current_level (name)
2565 if (current_binding_level == global_binding_level)
2566 return IDENTIFIER_GLOBAL_VALUE (name);
2568 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2571 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2572 if (DECL_NAME (t) == name)
2578 /* Create the predefined scalar types of C,
2579 and some nodes representing standard constants (0, 1, (void *)0).
2580 Initialize the global binding level.
2581 Make definitions for built-in primitive functions. */
2584 init_decl_processing ()
2586 register tree endlink;
2587 /* Either char* or void*. */
2588 tree traditional_ptr_type_node;
2589 /* Data types of memcpy and strlen. */
2590 tree memcpy_ftype, strlen_ftype;
2591 tree void_ftype_any;
2592 int wchar_type_size;
2594 tree array_domain_type;
2596 current_function_decl = NULL;
2597 named_labels = NULL;
2598 current_binding_level = NULL_BINDING_LEVEL;
2599 free_binding_level = NULL_BINDING_LEVEL;
2600 pushlevel (0); /* make the binding_level structure for global names */
2601 global_binding_level = current_binding_level;
2603 /* Define `int' and `char' first so that dbx will output them first. */
2605 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2606 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2607 integer_type_node));
2609 /* Define `char', which is like either `signed char' or `unsigned char'
2610 but not the same as either. */
2614 ? make_signed_type (CHAR_TYPE_SIZE)
2615 : make_unsigned_type (CHAR_TYPE_SIZE));
2616 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2619 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2620 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2621 long_integer_type_node));
2623 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2624 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2625 unsigned_type_node));
2627 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2628 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2629 long_unsigned_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 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2636 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2637 long_long_unsigned_type_node));
2639 /* `unsigned long' is the standard type for sizeof.
2640 Traditionally, use a signed type.
2641 Note that stddef.h uses `unsigned long',
2642 and this must agree, even of long and int are the same size. */
2644 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2645 if (flag_traditional && TREE_UNSIGNED (sizetype))
2646 sizetype = signed_type (sizetype);
2649 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2651 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2652 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2653 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2654 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2655 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2656 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2657 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2659 error_mark_node = make_node (ERROR_MARK);
2660 TREE_TYPE (error_mark_node) = error_mark_node;
2662 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2663 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2664 short_integer_type_node));
2666 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2667 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2668 short_unsigned_type_node));
2670 /* Define both `signed char' and `unsigned char'. */
2671 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2672 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2673 signed_char_type_node));
2675 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2676 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2677 unsigned_char_type_node));
2679 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2680 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2682 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2683 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2685 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2686 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2688 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2689 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2691 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2692 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2694 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2695 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2697 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2698 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2700 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2701 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2703 float_type_node = make_node (REAL_TYPE);
2704 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2705 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2707 layout_type (float_type_node);
2709 double_type_node = make_node (REAL_TYPE);
2710 if (flag_short_double)
2711 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2713 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2714 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2716 layout_type (double_type_node);
2718 long_double_type_node = make_node (REAL_TYPE);
2719 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2720 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2721 long_double_type_node));
2722 layout_type (long_double_type_node);
2724 complex_integer_type_node = make_node (COMPLEX_TYPE);
2725 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2726 complex_integer_type_node));
2727 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2728 layout_type (complex_integer_type_node);
2730 complex_float_type_node = make_node (COMPLEX_TYPE);
2731 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2732 complex_float_type_node));
2733 TREE_TYPE (complex_float_type_node) = float_type_node;
2734 layout_type (complex_float_type_node);
2736 complex_double_type_node = make_node (COMPLEX_TYPE);
2737 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2738 complex_double_type_node));
2739 TREE_TYPE (complex_double_type_node) = double_type_node;
2740 layout_type (complex_double_type_node);
2742 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2743 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2744 complex_long_double_type_node));
2745 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2746 layout_type (complex_long_double_type_node);
2749 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2750 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2751 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2752 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2754 integer_zero_node = build_int_2 (0, 0);
2755 TREE_TYPE (integer_zero_node) = integer_type_node;
2756 integer_one_node = build_int_2 (1, 0);
2757 TREE_TYPE (integer_one_node) = integer_type_node;
2759 size_zero_node = build_int_2 (0, 0);
2760 TREE_TYPE (size_zero_node) = sizetype;
2761 size_one_node = build_int_2 (1, 0);
2762 TREE_TYPE (size_one_node) = sizetype;
2764 void_type_node = make_node (VOID_TYPE);
2765 pushdecl (build_decl (TYPE_DECL,
2766 ridpointers[(int) RID_VOID], void_type_node));
2767 layout_type (void_type_node); /* Uses integer_zero_node */
2768 /* We are not going to have real types in C with less than byte alignment,
2769 so we might as well not have any types that claim to have it. */
2770 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2772 null_pointer_node = build_int_2 (0, 0);
2773 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2774 layout_type (TREE_TYPE (null_pointer_node));
2776 string_type_node = build_pointer_type (char_type_node);
2777 const_string_type_node
2778 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2780 /* Make a type to be the domain of a few array types
2781 whose domains don't really matter.
2782 200 is small enough that it always fits in size_t
2783 and large enough that it can hold most function names for the
2784 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2785 array_domain_type = build_index_type (build_int_2 (200, 0));
2787 /* make a type for arrays of characters.
2788 With luck nothing will ever really depend on the length of this
2790 char_array_type_node
2791 = build_array_type (char_type_node, array_domain_type);
2792 /* Likewise for arrays of ints. */
2794 = build_array_type (integer_type_node, array_domain_type);
2795 /* This is for wide string constants. */
2796 wchar_array_type_node
2797 = build_array_type (wchar_type_node, array_domain_type);
2799 default_function_type
2800 = build_function_type (integer_type_node, NULL_TREE);
2802 ptr_type_node = build_pointer_type (void_type_node);
2804 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2806 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2809 = build_function_type (void_type_node, NULL_TREE);
2812 = build_function_type (double_type_node,
2813 tree_cons (NULL_TREE, double_type_node, endlink));
2815 double_ftype_double_double
2816 = build_function_type (double_type_node,
2817 tree_cons (NULL_TREE, double_type_node,
2818 tree_cons (NULL_TREE,
2819 double_type_node, endlink)));
2822 = build_function_type (integer_type_node,
2823 tree_cons (NULL_TREE, integer_type_node, endlink));
2826 = build_function_type (long_integer_type_node,
2827 tree_cons (NULL_TREE,
2828 long_integer_type_node, endlink));
2830 void_ftype_ptr_ptr_int
2831 = build_function_type (void_type_node,
2832 tree_cons (NULL_TREE, ptr_type_node,
2833 tree_cons (NULL_TREE, ptr_type_node,
2834 tree_cons (NULL_TREE,
2838 int_ftype_cptr_cptr_sizet
2839 = build_function_type (integer_type_node,
2840 tree_cons (NULL_TREE, const_ptr_type_node,
2841 tree_cons (NULL_TREE, const_ptr_type_node,
2842 tree_cons (NULL_TREE,
2846 void_ftype_ptr_int_int
2847 = build_function_type (void_type_node,
2848 tree_cons (NULL_TREE, ptr_type_node,
2849 tree_cons (NULL_TREE, integer_type_node,
2850 tree_cons (NULL_TREE,
2854 string_ftype_ptr_ptr /* strcpy prototype */
2855 = build_function_type (string_type_node,
2856 tree_cons (NULL_TREE, string_type_node,
2857 tree_cons (NULL_TREE,
2858 const_string_type_node,
2861 int_ftype_string_string /* strcmp prototype */
2862 = build_function_type (integer_type_node,
2863 tree_cons (NULL_TREE, const_string_type_node,
2864 tree_cons (NULL_TREE,
2865 const_string_type_node,
2868 strlen_ftype /* strlen prototype */
2869 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2870 tree_cons (NULL_TREE, const_string_type_node,
2873 traditional_ptr_type_node
2874 = (flag_traditional ? string_type_node : ptr_type_node);
2876 memcpy_ftype /* memcpy prototype */
2877 = build_function_type (traditional_ptr_type_node,
2878 tree_cons (NULL_TREE, ptr_type_node,
2879 tree_cons (NULL_TREE, const_ptr_type_node,
2880 tree_cons (NULL_TREE,
2884 builtin_function ("__builtin_constant_p", int_ftype_int,
2885 BUILT_IN_CONSTANT_P, NULL_PTR);
2887 builtin_function ("__builtin_return_address",
2888 build_function_type (ptr_type_node,
2889 tree_cons (NULL_TREE,
2892 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2894 builtin_function ("__builtin_frame_address",
2895 build_function_type (ptr_type_node,
2896 tree_cons (NULL_TREE,
2899 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2901 builtin_function ("__builtin_alloca",
2902 build_function_type (ptr_type_node,
2903 tree_cons (NULL_TREE,
2906 BUILT_IN_ALLOCA, "alloca");
2907 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2908 /* Define alloca, ffs as builtins.
2909 Declare _exit just to mark it as volatile. */
2910 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2912 temp = builtin_function ("alloca",
2913 build_function_type (ptr_type_node,
2914 tree_cons (NULL_TREE,
2917 BUILT_IN_ALLOCA, NULL_PTR);
2918 /* Suppress error if redefined as a non-function. */
2919 DECL_BUILT_IN_NONANSI (temp) = 1;
2920 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2921 /* Suppress error if redefined as a non-function. */
2922 DECL_BUILT_IN_NONANSI (temp) = 1;
2923 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2925 TREE_THIS_VOLATILE (temp) = 1;
2926 TREE_SIDE_EFFECTS (temp) = 1;
2927 /* Suppress error if redefined as a non-function. */
2928 DECL_BUILT_IN_NONANSI (temp) = 1;
2931 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2932 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2934 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2936 builtin_function ("__builtin_saveregs",
2937 build_function_type (ptr_type_node, NULL_TREE),
2938 BUILT_IN_SAVEREGS, NULL_PTR);
2939 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2941 builtin_function ("__builtin_varargs",
2942 build_function_type (ptr_type_node,
2943 tree_cons (NULL_TREE,
2946 BUILT_IN_VARARGS, NULL_PTR);
2948 builtin_function ("__builtin_classify_type", default_function_type,
2949 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2950 builtin_function ("__builtin_next_arg",
2951 build_function_type (ptr_type_node, endlink),
2952 BUILT_IN_NEXT_ARG, NULL_PTR);
2953 builtin_function ("__builtin_args_info",
2954 build_function_type (integer_type_node,
2955 tree_cons (NULL_TREE,
2958 BUILT_IN_ARGS_INFO, NULL_PTR);
2960 /* Untyped call and return. */
2961 builtin_function ("__builtin_apply_args",
2962 build_function_type (ptr_type_node, NULL_TREE),
2963 BUILT_IN_APPLY_ARGS, NULL_PTR);
2965 temp = tree_cons (NULL_TREE,
2966 build_pointer_type (build_function_type (void_type_node,
2968 tree_cons (NULL_TREE,
2970 tree_cons (NULL_TREE,
2973 builtin_function ("__builtin_apply",
2974 build_function_type (ptr_type_node, temp),
2975 BUILT_IN_APPLY, NULL_PTR);
2976 builtin_function ("__builtin_return",
2977 build_function_type (void_type_node,
2978 tree_cons (NULL_TREE,
2981 BUILT_IN_RETURN, NULL_PTR);
2983 /* Currently under experimentation. */
2984 builtin_function ("__builtin_memcpy", memcpy_ftype,
2985 BUILT_IN_MEMCPY, "memcpy");
2986 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2987 BUILT_IN_MEMCMP, "memcmp");
2988 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2989 BUILT_IN_STRCMP, "strcmp");
2990 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2991 BUILT_IN_STRCPY, "strcpy");
2992 builtin_function ("__builtin_strlen", strlen_ftype,
2993 BUILT_IN_STRLEN, "strlen");
2994 builtin_function ("__builtin_fsqrt", double_ftype_double,
2995 BUILT_IN_FSQRT, "sqrt");
2996 builtin_function ("__builtin_sin", double_ftype_double,
2997 BUILT_IN_SIN, "sin");
2998 builtin_function ("__builtin_cos", double_ftype_double,
2999 BUILT_IN_COS, "cos");
3001 /* In an ANSI C program, it is okay to supply built-in meanings
3002 for these functions, since applications cannot validly use them
3003 with any other meaning.
3004 However, honor the -fno-builtin option. */
3005 if (!flag_no_builtin)
3007 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3008 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3009 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3010 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3011 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3013 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3015 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3017 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3018 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3019 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3020 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3022 /* Declare these functions volatile
3023 to avoid spurious "control drops through" warnings. */
3024 /* Don't specify the argument types, to avoid errors
3025 from certain code which isn't valid in ANSI but which exists. */
3026 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3028 TREE_THIS_VOLATILE (temp) = 1;
3029 TREE_SIDE_EFFECTS (temp) = 1;
3030 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3031 TREE_THIS_VOLATILE (temp) = 1;
3032 TREE_SIDE_EFFECTS (temp) = 1;
3036 /* Support for these has not been written in either expand_builtin
3037 or build_function_call. */
3038 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3039 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3040 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3042 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3044 builtin_function ("__builtin_fmod", double_ftype_double_double,
3045 BUILT_IN_FMOD, NULL_PTR);
3046 builtin_function ("__builtin_frem", double_ftype_double_double,
3047 BUILT_IN_FREM, NULL_PTR);
3048 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3049 BUILT_IN_MEMSET, NULL_PTR);
3050 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3052 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3056 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3057 declare_function_name ();
3059 start_identifier_warnings ();
3061 init_format_info_table ();
3065 incomplete_decl_finalize_hook = finish_incomplete_decl;
3068 /* Return a definition for a builtin function named NAME and whose data type
3069 is TYPE. TYPE should be a function type with argument types.
3070 FUNCTION_CODE tells later passes how to compile calls to this function.
3071 See tree.h for its possible values.
3073 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3074 the name to be called if we can't opencode the function. */
3077 builtin_function (name, type, function_code, library_name)
3080 enum built_in_function function_code;
3083 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3084 DECL_EXTERNAL (decl) = 1;
3085 TREE_PUBLIC (decl) = 1;
3086 /* If -traditional, permit redefining a builtin function any way you like.
3087 (Though really, if the program redefines these functions,
3088 it probably won't work right unless compiled with -fno-builtin.) */
3089 if (flag_traditional && name[0] != '_')
3090 DECL_BUILT_IN_NONANSI (decl) = 1;
3092 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3093 make_decl_rtl (decl, NULL_PTR, 1);
3095 if (function_code != NOT_BUILT_IN)
3097 DECL_BUILT_IN (decl) = 1;
3098 DECL_SET_FUNCTION_CODE (decl, function_code);
3100 /* Warn if a function in the namespace for users
3101 is used without an occasion to consider it declared. */
3102 if (name[0] != '_' || name[1] != '_')
3103 C_DECL_ANTICIPATED (decl) = 1;
3108 /* Called when a declaration is seen that contains no names to declare.
3109 If its type is a reference to a structure, union or enum inherited
3110 from a containing scope, shadow that tag name for the current scope
3111 with a forward reference.
3112 If its type defines a new named structure or union
3113 or defines an enum, it is valid but we need not do anything here.
3114 Otherwise, it is an error. */
3117 shadow_tag (declspecs)
3120 shadow_tag_warned (declspecs, 0);
3124 shadow_tag_warned (declspecs, warned)
3127 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3133 pending_invalid_xref = 0;
3135 for (link = declspecs; link; link = TREE_CHAIN (link))
3137 register tree value = TREE_VALUE (link);
3138 register enum tree_code code = TREE_CODE (value);
3140 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3141 /* Used to test also that TYPE_SIZE (value) != 0.
3142 That caused warning for `struct foo;' at top level in the file. */
3144 register tree name = lookup_tag_reverse (value);
3151 if (warned != 1 && code != ENUMERAL_TYPE)
3152 /* Empty unnamed enum OK */
3154 pedwarn ("unnamed struct/union that defines no instances");
3160 t = lookup_tag (code, name, current_binding_level, 1);
3164 t = make_node (code);
3173 warning ("useless keyword or type name in empty declaration");
3180 error ("two types specified in one empty declaration");
3185 pedwarn ("empty declaration");
3189 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3192 groktypename (typename)
3195 if (TREE_CODE (typename) != TREE_LIST)
3197 return grokdeclarator (TREE_VALUE (typename),
3198 TREE_PURPOSE (typename),
3202 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3205 groktypename_in_parm_context (typename)
3208 if (TREE_CODE (typename) != TREE_LIST)
3210 return grokdeclarator (TREE_VALUE (typename),
3211 TREE_PURPOSE (typename),
3215 /* Decode a declarator in an ordinary declaration or data definition.
3216 This is called as soon as the type information and variable name
3217 have been parsed, before parsing the initializer if any.
3218 Here we create the ..._DECL node, fill in its type,
3219 and put it on the list of decls for the current context.
3220 The ..._DECL node is returned as the value.
3222 Exception: for arrays where the length is not specified,
3223 the type is left null, to be filled in by `finish_decl'.
3225 Function definitions do not come here; they go to start_function
3226 instead. However, external and forward declarations of functions
3227 do go through here. Structure field declarations are done by
3228 grokfield and not through here. */
3230 /* Set this to zero to debug not using the temporary obstack
3231 to parse initializers. */
3232 int debug_temp_inits = 1;
3235 start_decl (declarator, declspecs, initialized)
3236 tree declarator, declspecs;
3239 register tree decl = grokdeclarator (declarator, declspecs,
3240 NORMAL, initialized);
3242 int init_written = initialized;
3244 /* The corresponding pop_obstacks is in finish_decl. */
3245 push_obstacks_nochange ();
3248 /* Is it valid for this decl to have an initializer at all?
3249 If not, set INITIALIZED to zero, which will indirectly
3250 tell `finish_decl' to ignore the initializer once it is parsed. */
3251 switch (TREE_CODE (decl))
3254 /* typedef foo = bar means give foo the same type as bar.
3255 We haven't parsed bar yet, so `finish_decl' will fix that up.
3256 Any other case of an initialization in a TYPE_DECL is an error. */
3257 if (pedantic || list_length (declspecs) > 1)
3259 error ("typedef `%s' is initialized",
3260 IDENTIFIER_POINTER (DECL_NAME (decl)));
3266 error ("function `%s' is initialized like a variable",
3267 IDENTIFIER_POINTER (DECL_NAME (decl)));
3272 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3273 error ("parameter `%s' is initialized",
3274 IDENTIFIER_POINTER (DECL_NAME (decl)));
3279 /* Don't allow initializations for incomplete types
3280 except for arrays which might be completed by the initialization. */
3281 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3283 /* A complete type is ok if size is fixed. */
3285 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3286 || C_DECL_VARIABLE_SIZE (decl))
3288 error ("variable-sized object may not be initialized");
3292 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3294 error ("variable `%s' has initializer but incomplete type",
3295 IDENTIFIER_POINTER (DECL_NAME (decl)));
3298 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3300 error ("elements of array `%s' have incomplete type",
3301 IDENTIFIER_POINTER (DECL_NAME (decl)));
3308 #if 0 /* Seems redundant with grokdeclarator. */
3309 if (current_binding_level != global_binding_level
3310 && DECL_EXTERNAL (decl)
3311 && TREE_CODE (decl) != FUNCTION_DECL)
3312 warning ("declaration of `%s' has `extern' and is initialized",
3313 IDENTIFIER_POINTER (DECL_NAME (decl)));
3315 DECL_EXTERNAL (decl) = 0;
3316 if (current_binding_level == global_binding_level)
3317 TREE_STATIC (decl) = 1;
3319 /* Tell `pushdecl' this is an initialized decl
3320 even though we don't yet have the initializer expression.
3321 Also tell `finish_decl' it may store the real initializer. */
3322 DECL_INITIAL (decl) = error_mark_node;
3325 /* If this is a function declaration, write a record describing it to the
3326 prototypes file (if requested). */
3328 if (TREE_CODE (decl) == FUNCTION_DECL)
3329 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3331 /* Add this decl to the current binding level.
3332 TEM may equal DECL or it may be a previous decl of the same name. */
3333 tem = pushdecl (decl);
3335 /* For a local variable, define the RTL now. */
3336 if (current_binding_level != global_binding_level
3337 /* But not if this is a duplicate decl
3338 and we preserved the rtl from the previous one
3339 (which may or may not happen). */
3340 && DECL_RTL (tem) == 0)
3342 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3344 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3345 && DECL_INITIAL (tem) != 0)
3351 /* When parsing and digesting the initializer,
3352 use temporary storage. Do this even if we will ignore the value. */
3353 if (current_binding_level == global_binding_level && debug_temp_inits)
3354 temporary_allocation ();
3360 /* Finish processing of a declaration;
3361 install its initial value.
3362 If the length of an array type is not known before,
3363 it must be determined now, from the initial value, or it is an error. */
3366 finish_decl (decl, init, asmspec_tree)
3370 register tree type = TREE_TYPE (decl);
3371 int was_incomplete = (DECL_SIZE (decl) == 0);
3372 int temporary = allocation_temporary_p ();
3376 asmspec = TREE_STRING_POINTER (asmspec_tree);
3378 /* If `start_decl' didn't like having an initialization, ignore it now. */
3380 if (init != 0 && DECL_INITIAL (decl) == 0)
3382 /* Don't crash if parm is initialized. */
3383 if (TREE_CODE (decl) == PARM_DECL)
3386 if (ITERATOR_P (decl))
3389 error_with_decl (decl, "iterator has no initial value");
3391 init = save_expr (init);
3396 if (TREE_CODE (decl) != TYPE_DECL)
3397 store_init_value (decl, init);
3400 /* typedef foo = bar; store the type of bar as the type of foo. */
3401 TREE_TYPE (decl) = TREE_TYPE (init);
3402 DECL_INITIAL (decl) = init = 0;
3406 /* Pop back to the obstack that is current for this binding level.
3407 This is because MAXINDEX, rtl, etc. to be made below
3408 must go in the permanent obstack. But don't discard the
3409 temporary data yet. */
3411 #if 0 /* pop_obstacks was near the end; this is what was here. */
3412 if (current_binding_level == global_binding_level && temporary)
3413 end_temporary_allocation ();
3416 /* Deduce size of array from initialization, if not already known */
3418 if (TREE_CODE (type) == ARRAY_TYPE
3419 && TYPE_DOMAIN (type) == 0
3420 && TREE_CODE (decl) != TYPE_DECL)
3423 = (TREE_STATIC (decl)
3424 /* Even if pedantic, an external linkage array
3425 may have incomplete type at first. */
3426 ? pedantic && !TREE_PUBLIC (decl)
3427 : !DECL_EXTERNAL (decl));
3429 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3431 /* Get the completed type made by complete_array_type. */
3432 type = TREE_TYPE (decl);
3435 error_with_decl (decl, "initializer fails to determine size of `%s'");
3440 error_with_decl (decl, "array size missing in `%s'");
3441 /* If a `static' var's size isn't known,
3442 make it extern as well as static, so it does not get
3444 If it is not `static', then do not mark extern;
3445 finish_incomplete_decl will give it a default size
3446 and it will get allocated. */
3447 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3448 DECL_EXTERNAL (decl) = 1;
3451 if (pedantic && TYPE_DOMAIN (type) != 0
3452 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3454 error_with_decl (decl, "zero-size array `%s'");
3456 layout_decl (decl, 0);
3459 if (TREE_CODE (decl) == VAR_DECL)
3461 if (DECL_SIZE (decl) == 0
3462 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3463 layout_decl (decl, 0);
3465 if (DECL_SIZE (decl) == 0
3466 && (TREE_STATIC (decl)
3468 /* A static variable with an incomplete type
3469 is an error if it is initialized.
3470 Otherwise, let it through, but if it is not `extern'
3471 then it may cause an error message later. */
3472 DECL_INITIAL (decl) != 0
3474 /* An automatic variable with an incomplete type
3476 !DECL_EXTERNAL (decl)))
3478 error_with_decl (decl, "storage size of `%s' isn't known");
3479 TREE_TYPE (decl) = error_mark_node;
3482 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3483 && DECL_SIZE (decl) != 0)
3485 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3486 constant_expression_warning (DECL_SIZE (decl));
3488 error_with_decl (decl, "storage size of `%s' isn't constant");
3492 /* Output the assembler code and/or RTL code for variables and functions,
3493 unless the type is an undefined structure or union.
3494 If not, it will get done when the type is completed. */
3496 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3498 if (flag_traditional && allocation_temporary_p ())
3500 push_obstacks_nochange ();
3501 end_temporary_allocation ();
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, asmspec,
3505 current_binding_level == global_binding_level,
3511 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3512 maybe_objc_check_decl (decl);
3513 rest_of_decl_compilation (decl, asmspec,
3514 current_binding_level == global_binding_level,
3517 if (current_binding_level != global_binding_level)
3519 /* Recompute the RTL of a local array now
3520 if it used to be an incomplete type. */
3522 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3524 /* If we used it already as memory, it must stay in memory. */
3525 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3526 /* If it's still incomplete now, no init will save it. */
3527 if (DECL_SIZE (decl) == 0)
3528 DECL_INITIAL (decl) = 0;
3531 /* Compute and store the initial value. */
3532 if (TREE_CODE (decl) != FUNCTION_DECL)
3533 expand_decl_init (decl);
3537 if (TREE_CODE (decl) == TYPE_DECL)
3539 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3540 maybe_objc_check_decl (decl);
3541 rest_of_decl_compilation (decl, NULL_PTR,
3542 current_binding_level == global_binding_level,
3546 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3547 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3548 && temporary && TREE_PERMANENT (decl)
3549 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3550 space with DECL_ARG_TYPE. */
3551 && TREE_CODE (decl) != PARM_DECL)
3553 /* We need to remember that this array HAD an initialization,
3554 but discard the actual temporary nodes,
3555 since we can't have a permanent node keep pointing to them. */
3556 /* We make an exception for inline functions, since it's
3557 normal for a local extern redeclaration of an inline function
3558 to have a copy of the top-level decl's DECL_INLINE. */
3559 if (DECL_INITIAL (decl) != 0)
3561 /* If this is a static const variable, then preserve the
3562 initializer instead of discarding it so that we can optimize
3563 references to it. */
3564 if (TREE_STATIC (decl) && TREE_READONLY (decl))
3565 preserve_initializer ();
3567 DECL_INITIAL (decl) = error_mark_node;
3572 /* Resume permanent allocation, if not within a function. */
3573 /* The corresponding push_obstacks_nochange is in start_decl,
3574 and in push_parm_decl and in grokfield. */
3578 /* If we have gone back from temporary to permanent allocation,
3579 actually free the temporary space that we no longer need. */
3580 if (temporary && !allocation_temporary_p ())
3581 permanent_allocation ();
3583 /* At the end of a declaration, throw away any variable type sizes
3584 of types defined inside that declaration. There is no use
3585 computing them in the following function definition. */
3586 if (current_binding_level == global_binding_level)
3587 get_pending_sizes ();
3590 /* If DECL has a cleanup, build and return that cleanup here.
3591 This is a callback called by expand_expr. */
3594 maybe_build_cleanup (decl)
3597 /* There are no cleanups in C. */
3601 /* Given a parsed parameter declaration,
3602 decode it into a PARM_DECL and push that on the current binding level.
3603 Also, for the sake of forward parm decls,
3604 record the given order of parms in `parm_order'. */
3607 push_parm_decl (parm)
3611 int old_immediate_size_expand = immediate_size_expand;
3612 /* Don't try computing parm sizes now -- wait till fn is called. */
3613 immediate_size_expand = 0;
3615 /* The corresponding pop_obstacks is in finish_decl. */
3616 push_obstacks_nochange ();
3618 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3621 if (DECL_NAME (decl))
3623 olddecl = lookup_name (DECL_NAME (decl));
3624 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3625 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3629 decl = pushdecl (decl);
3631 immediate_size_expand = old_immediate_size_expand;
3633 current_binding_level->parm_order
3634 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3636 /* Add this decl to the current binding level. */
3637 finish_decl (decl, NULL_TREE, NULL_TREE);
3640 /* Clear the given order of parms in `parm_order'.
3641 Used at start of parm list,
3642 and also at semicolon terminating forward decls. */
3647 current_binding_level->parm_order = NULL_TREE;
3650 /* Make TYPE a complete type based on INITIAL_VALUE.
3651 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3652 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3655 complete_array_type (type, initial_value, do_default)
3660 register tree maxindex = NULL_TREE;
3665 /* Note MAXINDEX is really the maximum index,
3666 one less than the size. */
3667 if (TREE_CODE (initial_value) == STRING_CST)
3670 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3671 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3673 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3676 = list_length (CONSTRUCTOR_ELTS (initial_value));
3677 maxindex = build_int_2 (nelts - 1, - (nelts == 0));
3681 /* Make an error message unless that happened already. */
3682 if (initial_value != error_mark_node)
3685 /* Prevent further error messages. */
3686 maxindex = build_int_2 (0, 0);
3693 maxindex = build_int_2 (0, 0);
3699 TYPE_DOMAIN (type) = build_index_type (maxindex);
3700 if (!TREE_TYPE (maxindex))
3701 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3702 #if 0 /* I took out this change
3703 together with the change in build_array_type. --rms */
3704 change_main_variant (type,
3705 build_array_type (TREE_TYPE (type),
3706 TYPE_DOMAIN (type)));
3710 /* Lay out the type now that we can get the real answer. */
3717 /* Given declspecs and a declarator,
3718 determine the name and type of the object declared
3719 and construct a ..._DECL node for it.
3720 (In one case we can return a ..._TYPE node instead.
3721 For invalid input we sometimes return 0.)
3723 DECLSPECS is a chain of tree_list nodes whose value fields
3724 are the storage classes and type specifiers.
3726 DECL_CONTEXT says which syntactic context this declaration is in:
3727 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3728 FUNCDEF for a function definition. Like NORMAL but a few different
3729 error messages in each case. Return value may be zero meaning
3730 this definition is too screwy to try to parse.
3731 PARM for a parameter declaration (either within a function prototype
3732 or before a function body). Make a PARM_DECL, or return void_type_node.
3733 TYPENAME if for a typename (in a cast or sizeof).
3734 Don't make a DECL node; just return the ..._TYPE node.
3735 FIELD for a struct or union field; make a FIELD_DECL.
3736 BITFIELD for a field with specified width.
3737 INITIALIZED is 1 if the decl has an initializer.
3739 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3740 It may also be so in the PARM case, for a prototype where the
3741 argument type is specified but not the name.
3743 This function is where the complicated C meanings of `static'
3744 and `extern' are interpreted. */
3747 grokdeclarator (declarator, declspecs, decl_context, initialized)
3750 enum decl_context decl_context;
3755 tree type = NULL_TREE;
3760 int explicit_int = 0;
3761 int explicit_char = 0;
3762 int defaulted_int = 0;
3763 tree typedef_decl = 0;
3765 tree typedef_type = 0;
3766 int funcdef_flag = 0;
3767 enum tree_code innermost_code = ERROR_MARK;
3769 int size_varies = 0;
3771 if (decl_context == BITFIELD)
3772 bitfield = 1, decl_context = FIELD;
3774 if (decl_context == FUNCDEF)
3775 funcdef_flag = 1, decl_context = NORMAL;
3777 push_obstacks_nochange ();
3779 if (flag_traditional && allocation_temporary_p ())
3780 end_temporary_allocation ();
3782 /* Look inside a declarator for the name being declared
3783 and get it as a string, for an error message. */
3785 register tree decl = declarator;
3789 switch (TREE_CODE (decl))
3794 innermost_code = TREE_CODE (decl);
3795 decl = TREE_OPERAND (decl, 0);
3798 case IDENTIFIER_NODE:
3799 name = IDENTIFIER_POINTER (decl);
3810 /* A function definition's declarator must have the form of
3811 a function declarator. */
3813 if (funcdef_flag && innermost_code != CALL_EXPR)
3816 /* Anything declared one level down from the top level
3817 must be one of the parameters of a function
3818 (because the body is at least two levels down). */
3820 /* If this looks like a function definition, make it one,
3821 even if it occurs where parms are expected.
3822 Then store_parm_decls will reject it and not use it as a parm. */
3823 if (decl_context == NORMAL && !funcdef_flag
3824 && current_binding_level->level_chain == global_binding_level)
3825 decl_context = PARM;
3827 /* Look through the decl specs and record which ones appear.
3828 Some typespecs are defined as built-in typenames.
3829 Others, the ones that are modifiers of other types,
3830 are represented by bits in SPECBITS: set the bits for
3831 the modifiers that appear. Storage class keywords are also in SPECBITS.
3833 If there is a typedef name or a type, store the type in TYPE.
3834 This includes builtin typedefs such as `int'.
3836 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3837 and did not come from a user typedef.
3839 Set LONGLONG if `long' is mentioned twice. */
3841 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3844 register tree id = TREE_VALUE (spec);
3846 if (id == ridpointers[(int) RID_INT])
3848 if (id == ridpointers[(int) RID_CHAR])
3851 if (TREE_CODE (id) == IDENTIFIER_NODE)
3852 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3854 if (ridpointers[i] == id)
3856 if (i == (int) RID_LONG && specbits & (1<<i))
3859 error ("`long long long' is too long for GCC");
3863 pedwarn ("ANSI C does not support `long long'");
3867 else if (specbits & (1 << i))
3868 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3874 error ("two or more data types in declaration of `%s'", name);
3875 /* Actual typedefs come to us as TYPE_DECL nodes. */
3876 else if (TREE_CODE (id) == TYPE_DECL)
3878 type = TREE_TYPE (id);
3881 /* Built-in types come as identifiers. */
3882 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3884 register tree t = lookup_name (id);
3885 if (TREE_TYPE (t) == error_mark_node)
3887 else if (!t || TREE_CODE (t) != TYPE_DECL)
3888 error ("`%s' fails to be a typedef or built in type",
3889 IDENTIFIER_POINTER (id));
3892 type = TREE_TYPE (t);
3896 else if (TREE_CODE (id) != ERROR_MARK)
3902 typedef_type = type;
3904 size_varies = C_TYPE_VARIABLE_SIZE (type);
3906 /* No type at all: default to `int', and set DEFAULTED_INT
3907 because it was not a user-defined typedef. */
3911 if (funcdef_flag && warn_return_type
3912 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3913 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3914 warn_about_return_type = 1;
3916 type = integer_type_node;
3919 /* Now process the modifiers that were specified
3920 and check for invalid combinations. */
3922 /* Long double is a special combination. */
3924 if ((specbits & 1 << (int) RID_LONG)
3925 && TYPE_MAIN_VARIANT (type) == double_type_node)
3927 specbits &= ~ (1 << (int) RID_LONG);
3928 type = long_double_type_node;
3931 /* Check all other uses of type modifiers. */
3933 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3934 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3938 if (TREE_CODE (type) != INTEGER_TYPE)
3939 error ("long, short, signed or unsigned invalid for `%s'", name);
3940 else if ((specbits & 1 << (int) RID_LONG)
3941 && (specbits & 1 << (int) RID_SHORT))
3942 error ("long and short specified together for `%s'", name);
3943 else if (((specbits & 1 << (int) RID_LONG)
3944 || (specbits & 1 << (int) RID_SHORT))
3946 error ("long or short specified with char for `%s'", name);
3947 else if (((specbits & 1 << (int) RID_LONG)
3948 || (specbits & 1 << (int) RID_SHORT))
3949 && TREE_CODE (type) == REAL_TYPE)
3950 error ("long or short specified with floating type for `%s'", name);
3951 else if ((specbits & 1 << (int) RID_SIGNED)
3952 && (specbits & 1 << (int) RID_UNSIGNED))
3953 error ("signed and unsigned given together for `%s'", name);
3957 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
3959 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3961 if (flag_pedantic_errors)
3966 /* Discard the type modifiers if they are invalid. */
3969 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3970 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3975 /* Decide whether an integer type is signed or not.
3976 Optionally treat bitfields as signed by default. */
3977 if (specbits & 1 << (int) RID_UNSIGNED
3978 /* Traditionally, all bitfields are unsigned. */
3979 || (bitfield && flag_traditional
3980 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3981 || (bitfield && ! flag_signed_bitfields
3982 && (explicit_int || defaulted_int || explicit_char
3983 /* A typedef for plain `int' without `signed'
3984 can be controlled just like plain `int'. */
3985 || ! (typedef_decl != 0
3986 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3987 && TREE_CODE (type) != ENUMERAL_TYPE
3988 && !(specbits & 1 << (int) RID_SIGNED)))
3991 type = long_long_unsigned_type_node;
3992 else if (specbits & 1 << (int) RID_LONG)
3993 type = long_unsigned_type_node;
3994 else if (specbits & 1 << (int) RID_SHORT)
3995 type = short_unsigned_type_node;
3996 else if (type == char_type_node)
3997 type = unsigned_char_type_node;
3998 else if (typedef_decl)
3999 type = unsigned_type (type);
4001 type = unsigned_type_node;
4003 else if ((specbits & 1 << (int) RID_SIGNED)
4004 && type == char_type_node)
4005 type = signed_char_type_node;
4007 type = long_long_integer_type_node;
4008 else if (specbits & 1 << (int) RID_LONG)
4009 type = long_integer_type_node;
4010 else if (specbits & 1 << (int) RID_SHORT)
4011 type = short_integer_type_node;
4012 else if (specbits & 1 << (int) RID_COMPLEX)
4015 type = complex_double_type_node;
4016 else if (type == integer_type_node)
4017 type = complex_integer_type_node;
4018 else if (type == float_type_node)
4019 type = complex_float_type_node;
4020 else if (type == double_type_node)
4021 type = complex_double_type_node;
4022 else if (type == long_double_type_node)
4023 type = complex_long_double_type_node;
4025 error ("invalid complex type");
4028 /* Set CONSTP if this declaration is `const', whether by
4029 explicit specification or via a typedef.
4030 Likewise for VOLATILEP. */
4032 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4033 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4034 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4036 pedwarn ("duplicate `const'");
4038 pedwarn ("duplicate `volatile'");
4039 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4040 type = TYPE_MAIN_VARIANT (type);
4042 /* Warn if two storage classes are given. Default to `auto'. */
4047 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4048 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4049 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4050 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4051 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4052 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4054 /* Warn about storage classes that are invalid for certain
4055 kinds of declarations (parameters, typenames, etc.). */
4058 error ("multiple storage classes in declaration of `%s'", name);
4059 else if (funcdef_flag
4061 & ((1 << (int) RID_REGISTER)
4062 | (1 << (int) RID_AUTO)
4063 | (1 << (int) RID_TYPEDEF))))
4065 if (specbits & 1 << (int) RID_AUTO
4066 && (pedantic || current_binding_level == global_binding_level))
4067 pedwarn ("function definition declared `auto'");
4068 if (specbits & 1 << (int) RID_REGISTER)
4069 error ("function definition declared `register'");
4070 if (specbits & 1 << (int) RID_TYPEDEF)
4071 error ("function definition declared `typedef'");
4072 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4073 | (1 << (int) RID_AUTO));
4075 else if (decl_context != NORMAL && nclasses > 0)
4077 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4081 error ((decl_context == FIELD
4082 ? "storage class specified for structure field `%s'"
4083 : (decl_context == PARM
4084 ? "storage class specified for parameter `%s'"
4085 : "storage class specified for typename")),
4087 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4088 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4089 | (1 << (int) RID_EXTERN));
4092 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4094 /* `extern' with initialization is invalid if not at top level. */
4095 if (current_binding_level == global_binding_level)
4096 warning ("`%s' initialized and declared `extern'", name);
4098 error ("`%s' has both `extern' and initializer", name);
4100 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4101 && current_binding_level != global_binding_level)
4102 error ("nested function `%s' declared `extern'", name);
4103 else if (current_binding_level == global_binding_level
4104 && specbits & (1 << (int) RID_AUTO))
4105 error ("top-level declaration of `%s' specifies `auto'", name);
4106 else if ((specbits & 1 << (int) RID_ITERATOR)
4107 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4109 error ("iterator `%s' has derived type", name);
4110 type = error_mark_node;
4112 else if ((specbits & 1 << (int) RID_ITERATOR)
4113 && TREE_CODE (type) != INTEGER_TYPE)
4115 error ("iterator `%s' has noninteger type", name);
4116 type = error_mark_node;
4120 /* Now figure out the structure of the declarator proper.
4121 Descend through it, creating more complex types, until we reach
4122 the declared identifier (or NULL_TREE, in an absolute declarator). */
4124 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4126 if (type == error_mark_node)
4128 declarator = TREE_OPERAND (declarator, 0);
4132 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4133 an INDIRECT_REF (for *...),
4134 a CALL_EXPR (for ...(...)),
4135 an identifier (for the name being declared)
4136 or a null pointer (for the place in an absolute declarator
4137 where the name was omitted).
4138 For the last two cases, we have just exited the loop.
4140 At this point, TYPE is the type of elements of an array,
4141 or for a function to return, or for a pointer to point to.
4142 After this sequence of ifs, TYPE is the type of the
4143 array or function or pointer, and DECLARATOR has had its
4144 outermost layer removed. */
4146 if (TREE_CODE (declarator) == ARRAY_REF)
4148 register tree itype = NULL_TREE;
4149 register tree size = TREE_OPERAND (declarator, 1);
4150 /* An uninitialized decl with `extern' is a reference. */
4151 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4153 declarator = TREE_OPERAND (declarator, 0);
4155 /* Check for some types that there cannot be arrays of. */
4157 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4159 error ("declaration of `%s' as array of voids", name);
4160 type = error_mark_node;
4163 if (TREE_CODE (type) == FUNCTION_TYPE)
4165 error ("declaration of `%s' as array of functions", name);
4166 type = error_mark_node;
4169 if (size == error_mark_node)
4170 type = error_mark_node;
4172 if (type == error_mark_node)
4175 /* If this is a block level extern, it must live past the end
4176 of the function so that we can check it against other extern
4177 declarations (IDENTIFIER_LIMBO_VALUE). */
4178 if (extern_ref && allocation_temporary_p ())
4179 end_temporary_allocation ();
4181 /* If size was specified, set ITYPE to a range-type for that size.
4182 Otherwise, ITYPE remains null. finish_decl may figure it out
4183 from an initial value. */
4187 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4188 STRIP_TYPE_NOPS (size);
4190 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4191 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4193 error ("size of array `%s' has non-integer type", name);
4194 size = integer_one_node;
4196 if (pedantic && integer_zerop (size))
4197 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4198 if (TREE_CODE (size) == INTEGER_CST)
4200 constant_expression_warning (size);
4201 if (INT_CST_LT (size, integer_zero_node))
4203 error ("size of array `%s' is negative", name);
4204 size = integer_one_node;
4206 itype = build_index_type (size_binop (MINUS_EXPR, size,
4213 if (TREE_CONSTANT (size))
4214 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4216 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4218 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
4220 /* Make sure the array size remains visibly nonconstant
4221 even if it is (eg) a const variable with known value. */
4223 itype = variable_size (itype);
4224 itype = build_index_type (itype);
4228 #if 0 /* This had bad results for pointers to arrays, as in
4229 union incomplete (*foo)[4]; */
4230 /* Complain about arrays of incomplete types, except in typedefs. */
4232 if (TYPE_SIZE (type) == 0
4233 /* Avoid multiple warnings for nested array types. */
4234 && TREE_CODE (type) != ARRAY_TYPE
4235 && !(specbits & (1 << (int) RID_TYPEDEF))
4236 && !C_TYPE_BEING_DEFINED (type))
4237 warning ("array type has incomplete element type");
4240 #if 0 /* We shouldn't have a function type here at all!
4241 Functions aren't allowed as array elements. */
4242 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4243 && (constp || volatilep))
4244 pedwarn ("ANSI C forbids const or volatile function types");
4247 /* Build the array type itself, then merge any constancy or
4248 volatility into the target type. We must do it in this order
4249 to ensure that the TYPE_MAIN_VARIANT field of the array type
4250 is set correctly. */
4252 type = build_array_type (type, itype);
4253 if (constp || volatilep)
4254 type = c_build_type_variant (type, constp, volatilep);
4256 #if 0 /* don't clear these; leave them set so that the array type
4257 or the variable is itself const or volatile. */
4263 C_TYPE_VARIABLE_SIZE (type) = 1;
4265 else if (TREE_CODE (declarator) == CALL_EXPR)
4267 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4268 || current_binding_level == global_binding_level);
4271 /* Declaring a function type.
4272 Make sure we have a valid type for the function to return. */
4273 if (type == error_mark_node)
4278 /* Warn about some types functions can't return. */
4280 if (TREE_CODE (type) == FUNCTION_TYPE)
4282 error ("`%s' declared as function returning a function", name);
4283 type = integer_type_node;
4285 if (TREE_CODE (type) == ARRAY_TYPE)
4287 error ("`%s' declared as function returning an array", name);
4288 type = integer_type_node;
4291 #ifndef TRADITIONAL_RETURN_FLOAT
4292 /* Traditionally, declaring return type float means double. */
4294 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4295 type = double_type_node;
4296 #endif /* TRADITIONAL_RETURN_FLOAT */
4298 /* If this is a block level extern, it must live past the end
4299 of the function so that we can check it against other extern
4300 declarations (IDENTIFIER_LIMBO_VALUE). */
4301 if (extern_ref && allocation_temporary_p ())
4302 end_temporary_allocation ();
4304 /* Construct the function type and go to the next
4305 inner layer of declarator. */
4307 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4309 /* Say it's a definition
4310 only for the CALL_EXPR
4311 closest to the identifier. */
4312 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4313 #if 0 /* This seems to be false. We turn off temporary allocation
4314 above in this function if -traditional.
4315 And this code caused inconsistent results with prototypes:
4316 callers would ignore them, and pass arguments wrong. */
4318 /* Omit the arg types if -traditional, since the arg types
4319 and the list links might not be permanent. */
4320 type = build_function_type (type,
4322 ? NULL_TREE : arg_types);
4324 /* ANSI seems to say that `const int foo ();'
4325 does not make the function foo const. */
4326 if (constp || volatilep)
4327 type = c_build_type_variant (type, constp, volatilep);
4331 type = build_function_type (type, arg_types);
4332 declarator = TREE_OPERAND (declarator, 0);
4334 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4335 the formal parameter list of this FUNCTION_TYPE to point to
4336 the FUNCTION_TYPE node itself. */
4341 for (link = current_function_parm_tags;
4343 link = TREE_CHAIN (link))
4344 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4347 else if (TREE_CODE (declarator) == INDIRECT_REF)
4349 /* Merge any constancy or volatility into the target type
4352 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4353 && (constp || volatilep))
4354 pedwarn ("ANSI C forbids const or volatile function types");
4355 if (constp || volatilep)
4356 type = c_build_type_variant (type, constp, volatilep);
4361 type = build_pointer_type (type);
4363 /* Process a list of type modifier keywords
4364 (such as const or volatile) that were given inside the `*'. */
4366 if (TREE_TYPE (declarator))
4368 register tree typemodlist;
4370 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4371 typemodlist = TREE_CHAIN (typemodlist))
4373 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4375 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4380 error ("invalid type modifier within pointer declarator");
4384 pedwarn ("duplicate `const'");
4386 pedwarn ("duplicate `volatile'");
4389 declarator = TREE_OPERAND (declarator, 0);
4396 /* Now TYPE has the actual type. */
4398 /* If this is declaring a typedef name, return a TYPE_DECL. */
4400 if (specbits & (1 << (int) RID_TYPEDEF))
4403 /* Note that the grammar rejects storage classes
4404 in typenames, fields or parameters */
4405 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4406 && (constp || volatilep))
4407 pedwarn ("ANSI C forbids const or volatile function types");
4408 if (constp || volatilep)
4409 type = c_build_type_variant (type, constp, volatilep);
4411 decl = build_decl (TYPE_DECL, declarator, type);
4412 if ((specbits & (1 << (int) RID_SIGNED))
4413 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4414 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4418 /* Detect the case of an array type of unspecified size
4419 which came, as such, direct from a typedef name.
4420 We must copy the type, so that each identifier gets
4421 a distinct type, so that each identifier's size can be
4422 controlled separately by its own initializer. */
4424 if (type != 0 && typedef_type != 0
4425 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4426 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4428 type = build_array_type (TREE_TYPE (type), 0);
4430 C_TYPE_VARIABLE_SIZE (type) = 1;
4433 /* If this is a type name (such as, in a cast or sizeof),
4434 compute the type and return it now. */
4436 if (decl_context == TYPENAME)
4438 /* Note that the grammar rejects storage classes
4439 in typenames, fields or parameters */
4440 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4441 && (constp || volatilep))
4442 pedwarn ("ANSI C forbids const or volatile function types");
4443 if (constp || volatilep)
4444 type = c_build_type_variant (type, constp, volatilep);
4449 /* Aside from typedefs and type names (handle above),
4450 `void' at top level (not within pointer)
4451 is allowed only in public variables.
4452 We don't complain about parms either, but that is because
4453 a better error message can be made later. */
4455 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4456 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4457 && ((specbits & (1 << (int) RID_EXTERN))
4458 || (current_binding_level == global_binding_level
4460 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4462 error ("variable or field `%s' declared void",
4463 IDENTIFIER_POINTER (declarator));
4464 type = integer_type_node;
4467 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4468 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4473 if (decl_context == PARM)
4475 tree type_as_written = type;
4478 /* A parameter declared as an array of T is really a pointer to T.
4479 One declared as a function is really a pointer to a function. */
4481 if (TREE_CODE (type) == ARRAY_TYPE)
4483 /* Transfer const-ness of array into that of type pointed to. */
4484 type = build_pointer_type
4485 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4486 volatilep = constp = 0;
4489 else if (TREE_CODE (type) == FUNCTION_TYPE)
4491 if (pedantic && (constp || volatilep))
4492 pedwarn ("ANSI C forbids const or volatile function types");
4493 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4494 volatilep = constp = 0;
4497 decl = build_decl (PARM_DECL, declarator, type);
4499 C_DECL_VARIABLE_SIZE (decl) = 1;
4501 /* Compute the type actually passed in the parmlist,
4502 for the case where there is no prototype.
4503 (For example, shorts and chars are passed as ints.)
4504 When there is a prototype, this is overridden later. */
4506 DECL_ARG_TYPE (decl) = type;
4507 main_type = (type == error_mark_node
4509 : TYPE_MAIN_VARIANT (type));
4510 if (main_type == float_type_node)
4511 DECL_ARG_TYPE (decl) = double_type_node;
4512 /* Don't use TYPE_PRECISION to decide whether to promote,
4513 because we should convert short if it's the same size as int,
4514 but we should not convert long if it's the same size as int. */
4515 else if (TREE_CODE (main_type) != ERROR_MARK
4516 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4518 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4519 && TREE_UNSIGNED (type))
4520 DECL_ARG_TYPE (decl) = unsigned_type_node;
4522 DECL_ARG_TYPE (decl) = integer_type_node;
4525 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4527 else if (decl_context == FIELD)
4529 /* Structure field. It may not be a function. */
4531 if (TREE_CODE (type) == FUNCTION_TYPE)
4533 error ("field `%s' declared as a function",
4534 IDENTIFIER_POINTER (declarator));
4535 type = build_pointer_type (type);
4537 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4539 error ("field `%s' has incomplete type",
4540 IDENTIFIER_POINTER (declarator));
4541 type = error_mark_node;
4543 /* Move type qualifiers down to element of an array. */
4544 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4546 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4548 TYPE_DOMAIN (type));
4549 #if 0 /* Leave the field const or volatile as well. */
4550 constp = volatilep = 0;
4553 decl = build_decl (FIELD_DECL, declarator, type);
4555 C_DECL_VARIABLE_SIZE (decl) = 1;
4557 else if (TREE_CODE (type) == FUNCTION_TYPE)
4559 /* Every function declaration is "external"
4560 except for those which are inside a function body
4561 in which `auto' is used.
4562 That is a case not specified by ANSI C,
4563 and we use it for forward declarations for nested functions. */
4564 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4565 || current_binding_level == global_binding_level);
4567 if (specbits & (1 << (int) RID_AUTO)
4568 && (pedantic || current_binding_level == global_binding_level))
4569 pedwarn ("invalid storage class for function `%s'",
4570 IDENTIFIER_POINTER (declarator));
4571 if (specbits & (1 << (int) RID_REGISTER))
4572 error ("invalid storage class for function `%s'",
4573 IDENTIFIER_POINTER (declarator));
4574 /* Function declaration not at top level.
4575 Storage classes other than `extern' are not allowed
4576 and `extern' makes no difference. */
4577 if (current_binding_level != global_binding_level
4578 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4580 pedwarn ("invalid storage class for function `%s'",
4581 IDENTIFIER_POINTER (declarator));
4583 /* If this is a block level extern, it must live past the end
4584 of the function so that we can check it against other
4585 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4586 if (extern_ref && allocation_temporary_p ())
4587 end_temporary_allocation ();
4589 decl = build_decl (FUNCTION_DECL, declarator, type);
4591 if (pedantic && (constp || volatilep)
4592 && ! DECL_IN_SYSTEM_HEADER (decl))
4593 pedwarn ("ANSI C forbids const or volatile functions");
4596 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4597 warning ("volatile function returns non-void value");
4600 DECL_EXTERNAL (decl) = 1;
4601 /* Record absence of global scope for `static' or `auto'. */
4603 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4604 /* Record presence of `inline', if it is reasonable. */
4607 tree last = tree_last (TYPE_ARG_TYPES (type));
4609 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4610 warning ("cannot inline function `main'");
4611 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4613 warning ("inline declaration ignored for function with `...'");
4615 /* Assume that otherwise the function can be inlined. */
4616 DECL_INLINE (decl) = 1;
4618 if (specbits & (1 << (int) RID_EXTERN))
4619 current_extern_inline = 1;
4624 /* It's a variable. */
4625 /* An uninitialized decl with `extern' is a reference. */
4626 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4628 /* Move type qualifiers down to element of an array. */
4629 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4631 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4633 TYPE_DOMAIN (type));
4634 #if 0 /* Leave the variable const or volatile as well. */
4635 constp = volatilep = 0;
4639 /* If this is a block level extern, it must live past the end
4640 of the function so that we can check it against other
4641 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4642 if (extern_ref && allocation_temporary_p ())
4643 end_temporary_allocation ();
4645 decl = build_decl (VAR_DECL, declarator, type);
4647 C_DECL_VARIABLE_SIZE (decl) = 1;
4650 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4652 DECL_EXTERNAL (decl) = extern_ref;
4653 /* At top level, the presence of a `static' or `register' storage
4654 class specifier, or the absence of all storage class specifiers
4655 makes this declaration a definition (perhaps tentative). Also,
4656 the absence of both `static' and `register' makes it public. */
4657 if (current_binding_level == global_binding_level)
4661 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4662 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4664 /* Not at top level, only `static' makes a static definition. */
4667 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4668 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4671 if (specbits & 1 << (int) RID_ITERATOR)
4672 ITERATOR_P (decl) = 1;
4675 /* Record `register' declaration for warnings on &
4676 and in case doing stupid register allocation. */
4678 if (specbits & (1 << (int) RID_REGISTER))
4679 DECL_REGISTER (decl) = 1;
4681 /* Record constancy and volatility. */
4684 TREE_READONLY (decl) = 1;
4687 TREE_SIDE_EFFECTS (decl) = 1;
4688 TREE_THIS_VOLATILE (decl) = 1;
4690 /* If a type has volatile components, it should be stored in memory.
4691 Otherwise, the fact that those components are volatile
4692 will be ignored, and would even crash the compiler. */
4693 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4694 mark_addressable (decl);
4702 /* Decode the parameter-list info for a function type or function definition.
4703 The argument is the value returned by `get_parm_info' (or made in parse.y
4704 if there is an identifier list instead of a parameter decl list).
4705 These two functions are separate because when a function returns
4706 or receives functions then each is called multiple times but the order
4707 of calls is different. The last call to `grokparms' is always the one
4708 that contains the formal parameter names of a function definition.
4710 Store in `last_function_parms' a chain of the decls of parms.
4711 Also store in `last_function_parm_tags' a chain of the struct, union,
4712 and enum tags declared among the parms.
4714 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4716 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4717 a mere declaration. A nonempty identifier-list gets an error message
4718 when FUNCDEF_FLAG is zero. */
4721 grokparms (parms_info, funcdef_flag)
4725 tree first_parm = TREE_CHAIN (parms_info);
4727 last_function_parms = TREE_PURPOSE (parms_info);
4728 last_function_parm_tags = TREE_VALUE (parms_info);
4730 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4731 && !in_system_header)
4732 warning ("function declaration isn't a prototype");
4735 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4738 pedwarn ("parameter names (without types) in function declaration");
4740 last_function_parms = first_parm;
4747 /* We no longer test FUNCDEF_FLAG.
4748 If the arg types are incomplete in a declaration,
4749 they must include undefined tags.
4750 These tags can never be defined in the scope of the declaration,
4751 so the types can never be completed,
4752 and no call can be compiled successfully. */
4754 /* In a fcn definition, arg types must be complete. */
4757 for (parm = last_function_parms, typelt = first_parm;
4759 parm = TREE_CHAIN (parm))
4760 /* Skip over any enumeration constants declared here. */
4761 if (TREE_CODE (parm) == PARM_DECL)
4763 /* Barf if the parameter itself has an incomplete type. */
4764 tree type = TREE_VALUE (typelt);
4765 if (TYPE_SIZE (type) == 0)
4767 if (funcdef_flag && DECL_NAME (parm) != 0)
4768 error ("parameter `%s' has incomplete type",
4769 IDENTIFIER_POINTER (DECL_NAME (parm)));
4771 warning ("parameter has incomplete type");
4774 TREE_VALUE (typelt) = error_mark_node;
4775 TREE_TYPE (parm) = error_mark_node;
4778 #if 0 /* This has been replaced by parm_tags_warning
4779 which uses a more accurate criterion for what to warn about. */
4782 /* Now warn if is a pointer to an incomplete type. */
4783 while (TREE_CODE (type) == POINTER_TYPE
4784 || TREE_CODE (type) == REFERENCE_TYPE)
4785 type = TREE_TYPE (type);
4786 type = TYPE_MAIN_VARIANT (type);
4787 if (TYPE_SIZE (type) == 0)
4789 if (DECL_NAME (parm) != 0)
4790 warning ("parameter `%s' points to incomplete type",
4791 IDENTIFIER_POINTER (DECL_NAME (parm)));
4793 warning ("parameter points to incomplete type");
4797 typelt = TREE_CHAIN (typelt);
4800 /* Allocate the list of types the way we allocate a type. */
4801 if (first_parm && ! TREE_PERMANENT (first_parm))
4803 /* Construct a copy of the list of types
4804 on the saveable obstack. */
4806 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4807 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4809 return nreverse (result);
4812 /* The list we have is permanent already. */
4818 /* Return a tree_list node with info on a parameter list just parsed.
4819 The TREE_PURPOSE is a chain of decls of those parms.
4820 The TREE_VALUE is a list of structure, union and enum tags defined.
4821 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4822 This tree_list node is later fed to `grokparms'.
4824 VOID_AT_END nonzero means append `void' to the end of the type-list.
4825 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4828 get_parm_info (void_at_end)
4831 register tree decl, t;
4832 register tree types = 0;
4834 tree tags = gettags ();
4835 tree parms = getdecls ();
4837 tree order = current_binding_level->parm_order;
4839 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4840 if (void_at_end && parms != 0
4841 && TREE_CHAIN (parms) == 0
4842 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4843 && DECL_NAME (parms) == 0)
4846 storedecls (NULL_TREE);
4847 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4848 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4851 /* Extract enumerator values and other non-parms declared with the parms.
4852 Likewise any forward parm decls that didn't have real parm decls. */
4853 for (decl = parms; decl; )
4855 tree next = TREE_CHAIN (decl);
4857 if (TREE_CODE (decl) != PARM_DECL)
4859 TREE_CHAIN (decl) = new_parms;
4862 else if (TREE_ASM_WRITTEN (decl))
4864 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4865 TREE_CHAIN (decl) = new_parms;
4871 /* Put the parm decls back in the order they were in in the parm list. */
4872 for (t = order; t; t = TREE_CHAIN (t))
4875 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4877 TREE_CHAIN (TREE_VALUE (t)) = 0;
4880 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4883 /* Store the parmlist in the binding level since the old one
4884 is no longer a valid list. (We have changed the chain pointers.) */
4885 storedecls (new_parms);
4887 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4888 /* There may also be declarations for enumerators if an enumeration
4889 type is declared among the parms. Ignore them here. */
4890 if (TREE_CODE (decl) == PARM_DECL)
4892 /* Since there is a prototype,
4893 args are passed in their declared types. */
4894 tree type = TREE_TYPE (decl);
4895 DECL_ARG_TYPE (decl) = type;
4896 #ifdef PROMOTE_PROTOTYPES
4897 if ((TREE_CODE (type) == INTEGER_TYPE
4898 || TREE_CODE (type) == ENUMERAL_TYPE)
4899 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4900 DECL_ARG_TYPE (decl) = integer_type_node;
4903 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4904 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4905 && DECL_NAME (decl) == 0)
4907 error ("`void' in parameter list must be the entire list");
4913 return saveable_tree_cons (new_parms, tags,
4914 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4916 return saveable_tree_cons (new_parms, tags, nreverse (types));
4919 /* At end of parameter list, warn about any struct, union or enum tags
4920 defined within. Do so because these types cannot ever become complete. */
4923 parmlist_tags_warning ()
4928 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4930 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4931 /* An anonymous union parm type is meaningful as a GNU extension.
4932 So don't warn for that. */
4933 if (code == UNION_TYPE && !pedantic)
4935 if (TREE_PURPOSE (elt) != 0)
4936 warning ("`%s %s' declared inside parameter list",
4937 (code == RECORD_TYPE ? "struct"
4938 : code == UNION_TYPE ? "union"
4940 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4942 warning ("anonymous %s declared inside parameter list",
4943 (code == RECORD_TYPE ? "struct"
4944 : code == UNION_TYPE ? "union"
4949 warning ("its scope is only this definition or declaration,");
4950 warning ("which is probably not what you want.");
4956 /* Get the struct, enum or union (CODE says which) with tag NAME.
4957 Define the tag as a forward-reference if it is not defined. */
4960 xref_tag (code, name)
4961 enum tree_code code;
4964 int temporary = allocation_temporary_p ();
4966 /* If a cross reference is requested, look up the type
4967 already defined for this tag and return it. */
4969 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4970 /* Even if this is the wrong type of tag, return what we found.
4971 There will be an error message anyway, from pending_xref_error.
4972 If we create an empty xref just for an invalid use of the type,
4973 the main result is to create lots of superfluous error messages. */
4977 push_obstacks_nochange ();
4979 if (current_binding_level == global_binding_level && temporary)
4980 end_temporary_allocation ();
4982 /* If no such tag is yet defined, create a forward-reference node
4983 and record it as the "definition".
4984 When a real declaration of this type is found,
4985 the forward-reference will be altered into a real type. */
4987 ref = make_node (code);
4988 if (code == ENUMERAL_TYPE)
4990 /* (In ANSI, Enums can be referred to only if already defined.) */
4992 pedwarn ("ANSI C forbids forward references to `enum' types");
4993 /* Give the type a default layout like unsigned int
4994 to avoid crashing if it does not get defined. */
4995 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4996 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4997 TREE_UNSIGNED (ref) = 1;
4998 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4999 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5000 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5003 pushtag (name, ref);
5010 /* Make sure that the tag NAME is defined *in the current binding level*
5011 at least as a forward reference.
5012 CODE says which kind of tag NAME ought to be.
5014 We also do a push_obstacks_nochange
5015 whose matching pop is in finish_struct. */
5018 start_struct (code, name)
5019 enum tree_code code;
5022 /* If there is already a tag defined at this binding level
5023 (as a forward reference), just return it. */
5025 register tree ref = 0;
5027 push_obstacks_nochange ();
5028 if (current_binding_level == global_binding_level)
5029 end_temporary_allocation ();
5032 ref = lookup_tag (code, name, current_binding_level, 1);
5033 if (ref && TREE_CODE (ref) == code)
5035 C_TYPE_BEING_DEFINED (ref) = 1;
5036 if (TYPE_FIELDS (ref))
5037 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5038 : "redefinition of `struct %s'"),
5039 IDENTIFIER_POINTER (name));
5044 /* Otherwise create a forward-reference just so the tag is in scope. */
5046 ref = make_node (code);
5047 pushtag (name, ref);
5048 C_TYPE_BEING_DEFINED (ref) = 1;
5052 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5053 of a structure component, returning a FIELD_DECL node.
5054 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5056 This is done during the parsing of the struct declaration.
5057 The FIELD_DECL nodes are chained together and the lot of them
5058 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5061 grokfield (filename, line, declarator, declspecs, width)
5064 tree declarator, declspecs, width;
5068 /* The corresponding pop_obstacks is in finish_decl. */
5069 push_obstacks_nochange ();
5071 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5073 finish_decl (value, NULL_TREE, NULL_TREE);
5074 DECL_INITIAL (value) = width;
5076 maybe_objc_check_decl (value);
5080 /* Function to help qsort sort FIELD_DECLs by name order. */
5083 field_decl_cmp (x, y)
5086 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
5089 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5090 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5092 We also do a pop_obstacks to match the push in start_struct. */
5095 finish_struct (t, fieldlist)
5096 register tree t, fieldlist;
5100 int toplevel = global_binding_level == current_binding_level;
5102 /* If this type was previously laid out as a forward reference,
5103 make sure we lay it out again. */
5107 /* Nameless union parm types are useful as GCC extension. */
5108 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5109 /* Otherwise, warn about any struct or union def. in parmlist. */
5110 if (in_parm_level_p ())
5113 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5114 : "structure defined inside parms"));
5115 else if (! flag_traditional)
5116 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5117 : "structure defined inside parms"));
5120 old_momentary = suspend_momentary ();
5122 if (fieldlist == 0 && pedantic)
5123 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5124 : "structure has no members"));
5126 /* Install struct as DECL_CONTEXT of each field decl.
5127 Also process specified field sizes.
5128 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5129 The specified size is found in the DECL_INITIAL.
5130 Store 0 there, except for ": 0" fields (so we can find them
5131 and delete them, below). */
5133 for (x = fieldlist; x; x = TREE_CHAIN (x))
5135 DECL_CONTEXT (x) = t;
5136 DECL_FIELD_SIZE (x) = 0;
5138 /* If any field is const, the structure type is pseudo-const. */
5139 if (TREE_READONLY (x))
5140 C_TYPE_FIELDS_READONLY (t) = 1;
5143 /* A field that is pseudo-const makes the structure likewise. */
5144 tree t1 = TREE_TYPE (x);
5145 while (TREE_CODE (t1) == ARRAY_TYPE)
5146 t1 = TREE_TYPE (t1);
5147 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5148 && C_TYPE_FIELDS_READONLY (t1))
5149 C_TYPE_FIELDS_READONLY (t) = 1;
5152 /* Any field that is volatile means variables of this type must be
5153 treated in some ways as volatile. */
5154 if (TREE_THIS_VOLATILE (x))
5155 C_TYPE_FIELDS_VOLATILE (t) = 1;
5157 /* Any field of nominal variable size implies structure is too. */
5158 if (C_DECL_VARIABLE_SIZE (x))
5159 C_TYPE_VARIABLE_SIZE (t) = 1;
5161 /* Detect invalid nested redefinition. */
5162 if (TREE_TYPE (x) == t)
5163 error ("nested redefinition of `%s'",
5164 IDENTIFIER_POINTER (TYPE_NAME (t)));
5166 /* Detect invalid bit-field size. */
5167 if (DECL_INITIAL (x))
5168 STRIP_NOPS (DECL_INITIAL (x));
5169 if (DECL_INITIAL (x))
5171 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5172 constant_expression_warning (DECL_INITIAL (x));
5175 error_with_decl (x, "bit-field `%s' width not an integer constant");
5176 DECL_INITIAL (x) = NULL;
5180 /* Detect invalid bit-field type. */
5181 if (DECL_INITIAL (x)
5182 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5183 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5185 error_with_decl (x, "bit-field `%s' has invalid type");
5186 DECL_INITIAL (x) = NULL;
5188 if (DECL_INITIAL (x) && pedantic
5189 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5190 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5191 /* Accept an enum that's equivalent to int or unsigned int. */
5192 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5193 && (TYPE_PRECISION (TREE_TYPE (x))
5194 == TYPE_PRECISION (integer_type_node))))
5195 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5197 /* Detect and ignore out of range field width. */
5198 if (DECL_INITIAL (x))
5200 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5202 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
5204 DECL_INITIAL (x) = NULL;
5205 error_with_decl (x, "negative width in bit-field `%s'");
5207 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5208 || width > TYPE_PRECISION (TREE_TYPE (x)))
5210 DECL_INITIAL (x) = NULL;
5211 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5213 else if (width == 0 && DECL_NAME (x) != 0)
5215 error_with_decl (x, "zero width for bit-field `%s'");
5216 DECL_INITIAL (x) = NULL;
5220 /* Process valid field width. */
5221 if (DECL_INITIAL (x))
5223 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5225 DECL_FIELD_SIZE (x) = width;
5226 DECL_BIT_FIELD (x) = 1;
5227 DECL_INITIAL (x) = NULL;
5231 /* field size 0 => force desired amount of alignment. */
5232 #ifdef EMPTY_FIELD_BOUNDARY
5233 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5235 #ifdef PCC_BITFIELD_TYPE_MATTERS
5236 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5237 TYPE_ALIGN (TREE_TYPE (x)));
5243 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5244 : TYPE_ALIGN (TREE_TYPE (x)));
5245 /* Non-bit-fields are aligned for their type, except packed
5246 fields which require only BITS_PER_UNIT alignment. */
5247 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5251 /* Now DECL_INITIAL is null on all members. */
5253 /* Delete all duplicate fields from the fieldlist */
5254 for (x = fieldlist; x && TREE_CHAIN (x);)
5255 /* Anonymous fields aren't duplicates. */
5256 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5260 register tree y = fieldlist;
5264 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5270 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5272 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5273 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5275 else x = TREE_CHAIN (x);
5278 /* Now we have the nearly final fieldlist. Record it,
5279 then lay out the structure or union (including the fields). */
5281 TYPE_FIELDS (t) = fieldlist;
5285 /* Delete all zero-width bit-fields from the front of the fieldlist */
5287 && DECL_INITIAL (fieldlist))
5288 fieldlist = TREE_CHAIN (fieldlist);
5289 /* Delete all such members from the rest of the fieldlist */
5290 for (x = fieldlist; x;)
5292 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5293 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5294 else x = TREE_CHAIN (x);
5297 /* Now we have the truly final field list.
5298 Store it in this type and in the variants. */
5300 TYPE_FIELDS (t) = fieldlist;
5302 /* If there are lots of fields, sort so we can look through them fast.
5303 We arbitrarily consider 16 or more elts to be "a lot". */
5307 for (x = fieldlist; x; x = TREE_CHAIN (x))
5318 len += list_length (x);
5319 /* Use the same allocation policy here that make_node uses, to
5320 ensure that this lives as long as the rest of the struct decl.
5321 All decls in an inline function need to be saved. */
5322 if (allocation_temporary_p ())
5323 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5325 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5327 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5328 TYPE_LANG_SPECIFIC (t)->len = len;
5330 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5332 for (x = fieldlist; x; x = TREE_CHAIN (x))
5333 field_array[len++] = x;
5335 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5339 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5341 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5342 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5343 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5346 /* Promote each bit-field's type to int if it is narrower than that. */
5347 for (x = fieldlist; x; x = TREE_CHAIN (x))
5348 if (DECL_BIT_FIELD (x)
5349 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
5350 || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
5352 tree type = TREE_TYPE (x);
5354 /* Preserve unsignedness if traditional
5355 or if not really getting any wider. */
5356 if (TREE_UNSIGNED (type)
5357 && (flag_traditional
5359 (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5361 DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
5362 TREE_TYPE (x) = unsigned_type_node;
5364 TREE_TYPE (x) = integer_type_node;
5367 /* If this structure or union completes the type of any previous
5368 variable declaration, lay it out and output its rtl. */
5370 if (current_binding_level->n_incomplete != 0)
5373 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5375 if (TREE_TYPE (decl) == t
5376 && TREE_CODE (decl) != TYPE_DECL)
5378 layout_decl (decl, 0);
5379 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5380 maybe_objc_check_decl (decl);
5381 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5384 --current_binding_level->n_incomplete;
5386 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5387 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5389 tree element = TREE_TYPE (decl);
5390 while (TREE_CODE (element) == ARRAY_TYPE)
5391 element = TREE_TYPE (element);
5393 layout_array_type (TREE_TYPE (decl));
5398 resume_momentary (old_momentary);
5400 /* Finish debugging output for this type. */
5401 rest_of_type_compilation (t, toplevel);
5403 /* The matching push is in start_struct. */
5409 /* Lay out the type T, and its element type, and so on. */
5412 layout_array_type (t)
5415 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5416 layout_array_type (TREE_TYPE (t));
5420 /* Begin compiling the definition of an enumeration type.
5421 NAME is its name (or null if anonymous).
5422 Returns the type object, as yet incomplete.
5423 Also records info about it so that build_enumerator
5424 may be used to declare the individual values as they are read. */
5430 register tree enumtype = 0;
5432 /* If this is the real definition for a previous forward reference,
5433 fill in the contents in the same object that used to be the
5434 forward reference. */
5437 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5439 /* The corresponding pop_obstacks is in finish_enum. */
5440 push_obstacks_nochange ();
5441 /* If these symbols and types are global, make them permanent. */
5442 if (current_binding_level == global_binding_level)
5443 end_temporary_allocation ();
5445 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5447 enumtype = make_node (ENUMERAL_TYPE);
5448 pushtag (name, enumtype);
5451 C_TYPE_BEING_DEFINED (enumtype) = 1;
5453 if (TYPE_VALUES (enumtype) != 0)
5455 /* This enum is a named one that has been declared already. */
5456 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5458 /* Completely replace its old definition.
5459 The old enumerators remain defined, however. */
5460 TYPE_VALUES (enumtype) = 0;
5463 enum_next_value = integer_zero_node;
5469 /* After processing and defining all the values of an enumeration type,
5470 install their decls in the enumeration type and finish it off.
5471 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5472 Returns ENUMTYPE. */
5475 finish_enum (enumtype, values)
5476 register tree enumtype, values;
5478 register tree pair, tem;
5479 tree minnode = 0, maxnode = 0;
5480 register HOST_WIDE_INT maxvalue = 0;
5481 register HOST_WIDE_INT minvalue = 0;
5483 unsigned precision = 0;
5484 int toplevel = global_binding_level == current_binding_level;
5485 int temporary = allocation_temporary_p ();
5487 if (in_parm_level_p ())
5488 warning ("enum defined inside parms");
5490 /* Calculate the maximum value of any enumerator in this type. */
5492 for (pair = values; pair; pair = TREE_CHAIN (pair))
5494 tree value = TREE_VALUE (pair);
5496 minnode = maxnode = TREE_VALUE (pair);
5499 if (tree_int_cst_lt (maxnode, value))
5501 if (tree_int_cst_lt (value, minnode))
5506 TYPE_MIN_VALUE (enumtype) = minnode;
5507 TYPE_MAX_VALUE (enumtype) = maxnode;
5509 /* Determine the precision this type needs. */
5511 if (TREE_INT_CST_HIGH (minnode) >= 0
5512 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5513 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5514 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5515 precision = TYPE_PRECISION (long_long_integer_type_node);
5518 maxvalue = TREE_INT_CST_LOW (maxnode);
5519 minvalue = TREE_INT_CST_LOW (minnode);
5522 precision = floor_log2 (maxvalue) + 1;
5525 /* Compute number of bits to represent magnitude of a negative value.
5526 Add one to MINVALUE since range of negative numbers
5527 includes the power of two. */
5528 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5529 if (negprecision > precision)
5530 precision = negprecision;
5531 precision += 1; /* room for sign bit */
5538 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5539 /* Use the width of the narrowest normal C type which is wide enough. */
5540 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5542 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5544 TYPE_SIZE (enumtype) = 0;
5545 layout_type (enumtype);
5547 /* An enum can have some negative values; then it is signed. */
5548 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5550 /* If the enumerators might not fit in an int, change their type now. */
5551 /* It seems more useful in the debugger to leave these as int
5552 unless the enumerator is wider than int. */
5553 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5554 for (pair = values; pair; pair = TREE_CHAIN (pair))
5556 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5557 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5558 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5559 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5562 /* Replace the decl nodes in VALUES with their names. */
5563 for (pair = values; pair; pair = TREE_CHAIN (pair))
5564 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5566 TYPE_VALUES (enumtype) = values;
5568 /* Fix up all variant types of this enum type. */
5569 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5571 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5572 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5573 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5574 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5575 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5576 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5577 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5578 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5581 /* Finish debugging output for this type. */
5582 rest_of_type_compilation (enumtype, toplevel);
5584 /* This matches a push in start_enum. */
5590 /* Build and install a CONST_DECL for one value of the
5591 current enumeration type (one that was begun with start_enum).
5592 Return a tree-list containing the CONST_DECL and its value.
5593 Assignment of sequential values by default is handled here. */
5596 build_enumerator (name, value)
5601 /* Validate and default VALUE. */
5603 /* Remove no-op casts from the value. */
5605 STRIP_TYPE_NOPS (value);
5609 if (TREE_CODE (value) == INTEGER_CST)
5611 value = default_conversion (value);
5612 constant_expression_warning (value);
5616 error ("enumerator value for `%s' not integer constant",
5617 IDENTIFIER_POINTER (name));
5622 /* Default based on previous value. */
5623 /* It should no longer be possible to have NON_LVALUE_EXPR
5627 value = enum_next_value;
5629 error ("overflow in enumeration values");
5632 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5634 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5635 value = integer_zero_node;
5638 /* Set basis for default for next value. */
5639 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5640 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5642 /* Now create a declaration for the enum value name. */
5644 decl = build_decl (CONST_DECL, name, integer_type_node);
5645 DECL_INITIAL (decl) = value;
5646 TREE_TYPE (value) = integer_type_node;
5649 return saveable_tree_cons (decl, value, NULL_TREE);
5652 /* Create the FUNCTION_DECL for a function definition.
5653 DECLSPECS and DECLARATOR are the parts of the declaration;
5654 they describe the function's name and the type it returns,
5655 but twisted together in a fashion that parallels the syntax of C.
5657 This function creates a binding context for the function body
5658 as well as setting up the FUNCTION_DECL in current_function_decl.
5660 Returns 1 on success. If the DECLARATOR is not suitable for a function
5661 (it defines a datum instead), we return 0, which tells
5662 yyparse to report a parse error.
5664 NESTED is nonzero for a function nested within another function. */
5667 start_function (declspecs, declarator, nested)
5668 tree declarator, declspecs;
5671 tree decl1, old_decl;
5674 current_function_returns_value = 0; /* Assume, until we see it does. */
5675 current_function_returns_null = 0;
5676 warn_about_return_type = 0;
5677 current_extern_inline = 0;
5678 c_function_varargs = 0;
5680 shadowed_labels = 0;
5682 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5684 /* If the declarator is not suitable for a function definition,
5685 cause a syntax error. */
5689 announce_function (decl1);
5691 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5693 error ("return-type is an incomplete type");
5694 /* Make it return void instead. */
5696 = build_function_type (void_type_node,
5697 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5700 if (warn_about_return_type)
5701 warning ("return-type defaults to `int'");
5703 /* Save the parm names or decls from this function's declarator
5704 where store_parm_decls will find them. */
5705 current_function_parms = last_function_parms;
5706 current_function_parm_tags = last_function_parm_tags;
5708 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5709 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5710 DECL_INITIAL (decl1) = error_mark_node;
5712 /* If this definition isn't a prototype and we had a prototype declaration
5713 before, copy the arg type info from that prototype.
5714 But not if what we had before was a builtin function. */
5715 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5716 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5717 && !DECL_BUILT_IN (old_decl)
5718 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5719 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5720 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5722 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5723 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5724 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5727 /* Optionally warn of old-fashioned def with no previous prototype. */
5728 if (warn_strict_prototypes
5729 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5730 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5731 warning ("function declaration isn't a prototype");
5732 /* Optionally warn of any global def with no previous prototype. */
5733 else if (warn_missing_prototypes
5734 && TREE_PUBLIC (decl1)
5735 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5736 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5737 warning_with_decl (decl1, "no previous prototype for `%s'");
5738 /* Optionally warn of any def with no previous prototype
5739 if the function has already been used. */
5740 else if (warn_missing_prototypes
5741 && old_decl != 0 && TREE_USED (old_decl)
5742 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5743 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5745 /* This is a definition, not a reference.
5746 So normally clear DECL_EXTERNAL.
5747 However, `extern inline' acts like a declaration
5748 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5749 DECL_EXTERNAL (decl1) = current_extern_inline;
5751 /* This function exists in static storage.
5752 (This does not mean `static' in the C sense!) */
5753 TREE_STATIC (decl1) = 1;
5755 /* A nested function is not global. */
5756 if (current_function_decl != 0)
5757 TREE_PUBLIC (decl1) = 0;
5759 /* Record the decl so that the function name is defined.
5760 If we already have a decl for this name, and it is a FUNCTION_DECL,
5761 use the old decl. */
5763 current_function_decl = pushdecl (decl1);
5766 declare_parm_level (1);
5767 current_binding_level->subblocks_tag_transparent = 1;
5769 make_function_rtl (current_function_decl);
5771 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5772 /* Promote the value to int before returning it. */
5773 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5775 /* It retains unsignedness if traditional
5776 or if not really getting wider. */
5777 if (TREE_UNSIGNED (restype)
5778 && (flag_traditional
5779 || (TYPE_PRECISION (restype)
5780 == TYPE_PRECISION (integer_type_node))))
5781 restype = unsigned_type_node;
5783 restype = integer_type_node;
5785 DECL_RESULT (current_function_decl)
5786 = build_decl (RESULT_DECL, NULL_TREE, restype);
5789 /* Allocate further tree nodes temporarily during compilation
5790 of this function only. */
5791 temporary_allocation ();
5793 /* If this fcn was already referenced via a block-scope `extern' decl
5794 (or an implicit decl), propagate certain information about the usage. */
5795 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5796 TREE_ADDRESSABLE (current_function_decl) = 1;
5801 /* Record that this function is going to be a varargs function.
5802 This is called before store_parm_decls, which is too early
5803 to call mark_varargs directly. */
5808 c_function_varargs = 1;
5811 /* Store the parameter declarations into the current function declaration.
5812 This is called after parsing the parameter declarations, before
5813 digesting the body of the function.
5815 For an old-style definition, modify the function's type
5816 to specify at least the number of arguments. */
5821 register tree fndecl = current_function_decl;
5824 /* This is either a chain of PARM_DECLs (if a prototype was used)
5825 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5826 tree specparms = current_function_parms;
5828 /* This is a list of types declared among parms in a prototype. */
5829 tree parmtags = current_function_parm_tags;
5831 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5832 register tree parmdecls = getdecls ();
5834 /* This is a chain of any other decls that came in among the parm
5835 declarations. If a parm is declared with enum {foo, bar} x;
5836 then CONST_DECLs for foo and bar are put here. */
5839 /* Nonzero if this definition is written with a prototype. */
5842 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5844 /* This case is when the function was defined with an ANSI prototype.
5845 The parms already have decls, so we need not do anything here
5846 except record them as in effect
5847 and complain if any redundant old-style parm decls were written. */
5858 error_with_decl (fndecl,
5859 "parm types given both in parmlist and separately");
5860 /* Get rid of the erroneous decls; don't keep them on
5861 the list of parms, since they might not be PARM_DECLs. */
5862 for (decl = current_binding_level->names;
5863 decl; decl = TREE_CHAIN (decl))
5864 if (DECL_NAME (decl))
5865 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5866 for (link = current_binding_level->shadowed;
5867 link; link = TREE_CHAIN (link))
5868 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5869 current_binding_level->names = 0;
5870 current_binding_level->shadowed = 0;
5873 specparms = nreverse (specparms);
5874 for (parm = specparms; parm; parm = next)
5876 next = TREE_CHAIN (parm);
5877 if (TREE_CODE (parm) == PARM_DECL)
5879 if (DECL_NAME (parm) == 0)
5880 error_with_decl (parm, "parameter name omitted");
5881 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5883 error_with_decl (parm, "parameter `%s' declared void");
5884 /* Change the type to error_mark_node so this parameter
5885 will be ignored by assign_parms. */
5886 TREE_TYPE (parm) = error_mark_node;
5892 /* If we find an enum constant or a type tag,
5893 put it aside for the moment. */
5894 TREE_CHAIN (parm) = 0;
5895 others = chainon (others, parm);
5899 /* Get the decls in their original chain order
5900 and record in the function. */
5901 DECL_ARGUMENTS (fndecl) = getdecls ();
5904 /* If this function takes a variable number of arguments,
5905 add a phony parameter to the end of the parm list,
5906 to represent the position of the first unnamed argument. */
5907 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5910 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5911 /* Let's hope the address of the unnamed parm
5912 won't depend on its type. */
5913 TREE_TYPE (dummy) = integer_type_node;
5914 DECL_ARG_TYPE (dummy) = integer_type_node;
5915 DECL_ARGUMENTS (fndecl)
5916 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5920 /* Now pushdecl the enum constants. */
5921 for (parm = others; parm; parm = next)
5923 next = TREE_CHAIN (parm);
5924 if (DECL_NAME (parm) == 0)
5926 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5928 else if (TREE_CODE (parm) != PARM_DECL)
5932 storetags (chainon (parmtags, gettags ()));
5936 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5937 each with a parm name as the TREE_VALUE.
5939 PARMDECLS is a chain of declarations for parameters.
5940 Warning! It can also contain CONST_DECLs which are not parameters
5941 but are names of enumerators of any enum types
5942 declared among the parameters.
5944 First match each formal parameter name with its declaration.
5945 Associate decls with the names and store the decls
5946 into the TREE_PURPOSE slots. */
5948 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5949 DECL_RESULT (parm) = 0;
5951 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5953 register tree tail, found = NULL;
5955 if (TREE_VALUE (parm) == 0)
5957 error_with_decl (fndecl, "parameter name missing from parameter list");
5958 TREE_PURPOSE (parm) = 0;
5962 /* See if any of the parmdecls specifies this parm by name.
5963 Ignore any enumerator decls. */
5964 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5965 if (DECL_NAME (tail) == TREE_VALUE (parm)
5966 && TREE_CODE (tail) == PARM_DECL)
5972 /* If declaration already marked, we have a duplicate name.
5973 Complain, and don't use this decl twice. */
5974 if (found && DECL_RESULT (found) != 0)
5976 error_with_decl (found, "multiple parameters named `%s'");
5980 /* If the declaration says "void", complain and ignore it. */
5981 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5983 error_with_decl (found, "parameter `%s' declared void");
5984 TREE_TYPE (found) = integer_type_node;
5985 DECL_ARG_TYPE (found) = integer_type_node;
5986 layout_decl (found, 0);
5989 /* Traditionally, a parm declared float is actually a double. */
5990 if (found && flag_traditional
5991 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5993 TREE_TYPE (found) = double_type_node;
5994 DECL_ARG_TYPE (found) = double_type_node;
5995 layout_decl (found, 0);
5998 /* If no declaration found, default to int. */
6001 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6003 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6004 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6005 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6007 warning_with_decl (found, "type of `%s' defaults to `int'");
6011 TREE_PURPOSE (parm) = found;
6013 /* Mark this decl as "already found" -- see test, above.
6014 It is safe to use DECL_RESULT for this
6015 since it is not used in PARM_DECLs or CONST_DECLs. */
6016 DECL_RESULT (found) = error_mark_node;
6019 /* Put anything which is on the parmdecls chain and which is
6020 not a PARM_DECL onto the list NONPARMS. (The types of
6021 non-parm things which might appear on the list include
6022 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6023 any actual PARM_DECLs not matched with any names. */
6026 for (parm = parmdecls; parm; )
6028 tree next = TREE_CHAIN (parm);
6029 TREE_CHAIN (parm) = 0;
6031 if (TREE_CODE (parm) != PARM_DECL)
6032 nonparms = chainon (nonparms, parm);
6035 /* Complain about args with incomplete types. */
6036 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6038 error_with_decl (parm, "parameter `%s' has incomplete type");
6039 TREE_TYPE (parm) = error_mark_node;
6042 if (DECL_RESULT (parm) == 0)
6044 error_with_decl (parm,
6045 "declaration for parameter `%s' but no such parameter");
6046 /* Pretend the parameter was not missing.
6047 This gets us to a standard state and minimizes
6048 further error messages. */
6050 = chainon (specparms,
6051 tree_cons (parm, NULL_TREE, NULL_TREE));
6058 /* Chain the declarations together in the order of the list of names. */
6059 /* Store that chain in the function decl, replacing the list of names. */
6061 DECL_ARGUMENTS (fndecl) = 0;
6064 for (last = 0; parm; parm = TREE_CHAIN (parm))
6065 if (TREE_PURPOSE (parm))
6068 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6070 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6071 last = TREE_PURPOSE (parm);
6072 TREE_CHAIN (last) = 0;
6076 /* If there was a previous prototype,
6077 set the DECL_ARG_TYPE of each argument according to
6078 the type previously specified, and report any mismatches. */
6080 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6083 for (parm = DECL_ARGUMENTS (fndecl),
6084 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6085 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6086 != void_type_node));
6087 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6089 if (parm == 0 || type == 0
6090 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6092 error ("number of arguments doesn't match prototype");
6093 error_with_file_and_line (current_function_prototype_file,
6094 current_function_prototype_line,
6095 "prototype declaration");
6098 /* Type for passing arg must be consistent
6099 with that declared for the arg. */
6100 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6102 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6103 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6105 /* Adjust argument to match prototype. E.g. a previous
6106 `int foo(float);' prototype causes
6107 `int foo(x) float x; {...}' to be treated like
6108 `int foo(float x) {...}'. This is particularly
6109 useful for argument types like uid_t. */
6110 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6111 #ifdef PROMOTE_PROTOTYPES
6112 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6113 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6114 && TYPE_PRECISION (TREE_TYPE (parm))
6115 < TYPE_PRECISION (integer_type_node))
6116 DECL_ARG_TYPE (parm) = integer_type_node;
6120 pedwarn ("promoted argument `%s' doesn't match prototype",
6121 IDENTIFIER_POINTER (DECL_NAME (parm)));
6122 warning_with_file_and_line
6123 (current_function_prototype_file,
6124 current_function_prototype_line,
6125 "prototype declaration");
6128 /* If -traditional, allow `int' argument to match
6129 `unsigned' prototype. */
6130 else if (! (flag_traditional
6131 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6132 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6134 error ("argument `%s' doesn't match prototype",
6135 IDENTIFIER_POINTER (DECL_NAME (parm)));
6136 error_with_file_and_line (current_function_prototype_file,
6137 current_function_prototype_line,
6138 "prototype declaration");
6142 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6145 /* Otherwise, create a prototype that would match. */
6149 register tree actual, type;
6150 register tree last = 0;
6152 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6154 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6157 TREE_CHAIN (last) = type;
6162 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6164 TREE_CHAIN (last) = type;
6168 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6169 of the type of this function, but we need to avoid having this
6170 affect the types of other similarly-typed functions, so we must
6171 first force the generation of an identical (but separate) type
6172 node for the relevant function type. The new node we create
6173 will be a variant of the main variant of the original function
6176 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6178 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6181 /* Now store the final chain of decls for the arguments
6182 as the decl-chain of the current lexical scope.
6183 Put the enumerators in as well, at the front so that
6184 DECL_ARGUMENTS is not modified. */
6186 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6189 /* Make sure the binding level for the top of the function body
6190 gets a BLOCK if there are any in the function.
6191 Otherwise, the dbx output is wrong. */
6193 keep_next_if_subblocks = 1;
6195 /* ??? This might be an improvement,
6196 but needs to be thought about some more. */
6198 keep_next_level_flag = 1;
6201 /* Write a record describing this function definition to the prototypes
6202 file (if requested). */
6204 gen_aux_info_record (fndecl, 1, 0, prototype);
6206 /* Initialize the RTL code for the function. */
6208 init_function_start (fndecl, input_filename, lineno);
6210 /* If this is a varargs function, inform function.c. */
6212 if (c_function_varargs)
6215 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6217 declare_function_name ();
6219 /* Set up parameters and prepare for return, for the function. */
6221 expand_function_start (fndecl, 0);
6223 /* If this function is `main', emit a call to `__main'
6224 to run global initializers, etc. */
6225 if (DECL_NAME (fndecl)
6226 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6227 && DECL_CONTEXT (fndecl) == NULL_TREE)
6228 expand_main_function ();
6231 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6232 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6233 stands for an ellipsis in the identifier list.
6235 PARMLIST is the data returned by get_parm_info for the
6236 parmlist that follows the semicolon.
6238 We return a value of the same sort that get_parm_info returns,
6239 except that it describes the combination of identifiers and parmlist. */
6242 combine_parm_decls (specparms, parmlist, void_at_end)
6243 tree specparms, parmlist;
6246 register tree fndecl = current_function_decl;
6249 tree parmdecls = TREE_PURPOSE (parmlist);
6251 /* This is a chain of any other decls that came in among the parm
6252 declarations. They were separated already by get_parm_info,
6253 so we just need to keep them separate. */
6254 tree nonparms = TREE_VALUE (parmlist);
6258 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6259 DECL_RESULT (parm) = 0;
6261 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6263 register tree tail, found = NULL;
6265 /* See if any of the parmdecls specifies this parm by name. */
6266 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6267 if (DECL_NAME (tail) == TREE_VALUE (parm))
6273 /* If declaration already marked, we have a duplicate name.
6274 Complain, and don't use this decl twice. */
6275 if (found && DECL_RESULT (found) != 0)
6277 error_with_decl (found, "multiple parameters named `%s'");
6281 /* If the declaration says "void", complain and ignore it. */
6282 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6284 error_with_decl (found, "parameter `%s' declared void");
6285 TREE_TYPE (found) = integer_type_node;
6286 DECL_ARG_TYPE (found) = integer_type_node;
6287 layout_decl (found, 0);
6290 /* Traditionally, a parm declared float is actually a double. */
6291 if (found && flag_traditional
6292 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6294 TREE_TYPE (found) = double_type_node;
6295 DECL_ARG_TYPE (found) = double_type_node;
6296 layout_decl (found, 0);
6299 /* If no declaration found, default to int. */
6302 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6304 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6305 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6306 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6307 error_with_decl (found, "type of parameter `%s' is not declared");
6311 TREE_PURPOSE (parm) = found;
6313 /* Mark this decl as "already found" -- see test, above.
6314 It is safe to use DECL_RESULT for this
6315 since it is not used in PARM_DECLs or CONST_DECLs. */
6316 DECL_RESULT (found) = error_mark_node;
6319 /* Complain about any actual PARM_DECLs not matched with any names. */
6321 for (parm = parmdecls; parm; )
6323 tree next = TREE_CHAIN (parm);
6324 TREE_CHAIN (parm) = 0;
6326 /* Complain about args with incomplete types. */
6327 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6329 error_with_decl (parm, "parameter `%s' has incomplete type");
6330 TREE_TYPE (parm) = error_mark_node;
6333 if (DECL_RESULT (parm) == 0)
6335 error_with_decl (parm,
6336 "declaration for parameter `%s' but no such parameter");
6337 /* Pretend the parameter was not missing.
6338 This gets us to a standard state and minimizes
6339 further error messages. */
6341 = chainon (specparms,
6342 tree_cons (parm, NULL_TREE, NULL_TREE));
6348 /* Chain the declarations together in the order of the list of names.
6349 At the same time, build up a list of their types, in reverse order. */
6355 for (last = 0; parm; parm = TREE_CHAIN (parm))
6356 if (TREE_PURPOSE (parm))
6359 parmdecls = TREE_PURPOSE (parm);
6361 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6362 last = TREE_PURPOSE (parm);
6363 TREE_CHAIN (last) = 0;
6365 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6370 return saveable_tree_cons (parmdecls, nonparms,
6371 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6373 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6376 /* Finish up a function declaration and compile that function
6377 all the way to assembler language output. The free the storage
6378 for the function definition.
6380 This is called after parsing the body of the function definition.
6382 NESTED is nonzero if the function being finished is nested in another. */
6385 finish_function (nested)
6388 register tree fndecl = current_function_decl;
6390 /* TREE_READONLY (fndecl) = 1;
6391 This caused &foo to be of type ptr-to-const-function
6392 which then got a warning when stored in a ptr-to-function variable. */
6395 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6397 /* Must mark the RESULT_DECL as being in this function. */
6399 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6401 /* Obey `register' declarations if `setjmp' is called in this fn. */
6402 if (flag_traditional && current_function_calls_setjmp)
6404 setjmp_protect (DECL_INITIAL (fndecl));
6405 setjmp_protect_args ();
6408 #ifdef DEFAULT_MAIN_RETURN
6409 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6411 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6412 != integer_type_node)
6413 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6416 /* Make it so that `main' always returns success by default. */
6417 DEFAULT_MAIN_RETURN;
6422 /* Generate rtl for function exit. */
6423 expand_function_end (input_filename, lineno);
6425 /* So we can tell if jump_optimize sets it to 1. */
6428 /* Run the optimizers and output the assembler code for this function. */
6429 rest_of_compilation (fndecl);
6431 current_function_returns_null |= can_reach_end;
6433 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6434 warning ("`volatile' function does return");
6435 else if (warn_return_type && can_reach_end
6436 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6437 /* If this function returns non-void and control can drop through,
6439 warning ("control reaches end of non-void function");
6440 /* With just -W, complain only if function returns both with
6441 and without a value. */
6442 else if (extra_warnings
6443 && current_function_returns_value && current_function_returns_null)
6444 warning ("this function may return with or without a value");
6446 /* Free all the tree nodes making up this function. */
6447 /* Switch back to allocating nodes permanently
6448 until we start another function. */
6450 permanent_allocation ();
6452 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6454 /* Stop pointing to the local nodes about to be freed. */
6455 /* But DECL_INITIAL must remain nonzero so we know this
6456 was an actual function definition. */
6457 /* For a nested function, this is done in pop_c_function_context. */
6458 DECL_INITIAL (fndecl) = error_mark_node;
6459 DECL_ARGUMENTS (fndecl) = 0;
6464 /* Let the error reporting routines know that we're outside a
6465 function. For a nested function, this value is used in
6466 pop_c_function_context and then reset via pop_function_context. */
6467 current_function_decl = NULL;
6471 /* Save and restore the variables in this file and elsewhere
6472 that keep track of the progress of compilation of the current function.
6473 Used for nested functions. */
6477 struct c_function *next;
6479 tree shadowed_labels;
6482 int warn_about_return_type;
6484 struct binding_level *binding_level;
6487 struct c_function *c_function_chain;
6489 /* Save and reinitialize the variables
6490 used during compilation of a C function. */
6493 push_c_function_context ()
6495 struct c_function *p
6496 = (struct c_function *) xmalloc (sizeof (struct c_function));
6499 pedwarn ("ANSI C forbids nested functions");
6501 push_function_context ();
6503 p->next = c_function_chain;
6504 c_function_chain = p;
6506 p->named_labels = named_labels;
6507 p->shadowed_labels = shadowed_labels;
6508 p->returns_value = current_function_returns_value;
6509 p->returns_null = current_function_returns_null;
6510 p->warn_about_return_type = warn_about_return_type;
6511 p->extern_inline = current_extern_inline;
6512 p->binding_level = current_binding_level;
6515 /* Restore the variables used during compilation of a C function. */
6518 pop_c_function_context ()
6520 struct c_function *p = c_function_chain;
6523 /* Bring back all the labels that were shadowed. */
6524 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6525 if (DECL_NAME (TREE_VALUE (link)) != 0)
6526 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6527 = TREE_VALUE (link);
6529 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6531 /* Stop pointing to the local nodes about to be freed. */
6532 /* But DECL_INITIAL must remain nonzero so we know this
6533 was an actual function definition. */
6534 DECL_INITIAL (current_function_decl) = error_mark_node;
6535 DECL_ARGUMENTS (current_function_decl) = 0;
6538 pop_function_context ();
6540 c_function_chain = p->next;
6542 named_labels = p->named_labels;
6543 shadowed_labels = p->shadowed_labels;
6544 current_function_returns_value = p->returns_value;
6545 current_function_returns_null = p->returns_null;
6546 warn_about_return_type = p->warn_about_return_type;
6547 current_extern_inline = p->extern_inline;
6548 current_binding_level = p->binding_level;