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 allow single precision math even if we're generally
441 being traditional. */
442 int flag_allow_single_precision = 0;
444 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
446 int flag_signed_bitfields = 1;
447 int explicit_flag_signed_bitfields = 0;
449 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
451 int flag_no_ident = 0;
453 /* Nonzero means warn about implicit declarations. */
457 /* Nonzero means give string constants the type `const char *'
458 to get extra warnings from them. These warnings will be too numerous
459 to be useful, except in thoroughly ANSIfied programs. */
461 int warn_write_strings;
463 /* Nonzero means warn about pointer casts that can drop a type qualifier
464 from the pointer target type. */
468 /* Warn about traditional constructs whose meanings changed in ANSI C. */
470 int warn_traditional;
472 /* Nonzero means warn about sizeof(function) or addition/subtraction
473 of function pointers. */
475 int warn_pointer_arith;
477 /* Nonzero means warn for non-prototype function decls
478 or non-prototyped defs without previous prototype. */
480 int warn_strict_prototypes;
482 /* Nonzero means warn for any global function def
483 without separate previous prototype decl. */
485 int warn_missing_prototypes;
487 /* Nonzero means warn about multiple (redundant) decls for the same single
488 variable or function. */
490 int warn_redundant_decls = 0;
492 /* Nonzero means warn about extern declarations of objects not at
493 file-scope level and about *all* declarations of functions (whether
494 extern or static) not at file-scope level. Note that we exclude
495 implicit function declarations. To get warnings about those, use
498 int warn_nested_externs = 0;
500 /* Warn about *printf or *scanf format/argument anomalies. */
504 /* Warn about a subscript that has type char. */
506 int warn_char_subscripts = 0;
508 /* Warn if a type conversion is done that might have confusing results. */
512 /* Warn if adding () is suggested. */
514 int warn_parentheses;
516 /* Warn if initializer is not completely bracketed. */
518 int warn_missing_braces;
520 /* Nonzero means `$' can be in an identifier.
521 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
523 #ifndef DOLLARS_IN_IDENTIFIERS
524 #define DOLLARS_IN_IDENTIFIERS 1
526 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
528 /* Decode the string P as a language-specific option for C.
529 Return 1 if it is recognized (and handle it);
530 return 0 if not recognized. */
536 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
538 flag_traditional = 1;
539 flag_writable_strings = 1;
540 #if DOLLARS_IN_IDENTIFIERS > 0
541 dollars_in_ident = 1;
544 else if (!strcmp (p, "-fallow-single-precision"))
545 flag_allow_single_precision = 1;
546 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
548 flag_traditional = 0;
549 flag_writable_strings = 0;
550 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
552 else if (!strcmp (p, "-fdollars-in-identifiers"))
554 #if DOLLARS_IN_IDENTIFIERS > 0
555 dollars_in_ident = 1;
558 else if (!strcmp (p, "-fnodollars-in-identifiers"))
559 dollars_in_ident = 0;
560 else if (!strcmp (p, "-fsigned-char"))
561 flag_signed_char = 1;
562 else if (!strcmp (p, "-funsigned-char"))
563 flag_signed_char = 0;
564 else if (!strcmp (p, "-fno-signed-char"))
565 flag_signed_char = 0;
566 else if (!strcmp (p, "-fno-unsigned-char"))
567 flag_signed_char = 1;
568 else if (!strcmp (p, "-fsigned-bitfields")
569 || !strcmp (p, "-fno-unsigned-bitfields"))
571 flag_signed_bitfields = 1;
572 explicit_flag_signed_bitfields = 1;
574 else if (!strcmp (p, "-funsigned-bitfields")
575 || !strcmp (p, "-fno-signed-bitfields"))
577 flag_signed_bitfields = 0;
578 explicit_flag_signed_bitfields = 1;
580 else if (!strcmp (p, "-fshort-enums"))
581 flag_short_enums = 1;
582 else if (!strcmp (p, "-fno-short-enums"))
583 flag_short_enums = 0;
584 else if (!strcmp (p, "-fcond-mismatch"))
585 flag_cond_mismatch = 1;
586 else if (!strcmp (p, "-fno-cond-mismatch"))
587 flag_cond_mismatch = 0;
588 else if (!strcmp (p, "-fshort-double"))
589 flag_short_double = 1;
590 else if (!strcmp (p, "-fno-short-double"))
591 flag_short_double = 0;
592 else if (!strcmp (p, "-fasm"))
594 else if (!strcmp (p, "-fno-asm"))
596 else if (!strcmp (p, "-fbuiltin"))
598 else if (!strcmp (p, "-fno-builtin"))
600 else if (!strcmp (p, "-fno-ident"))
602 else if (!strcmp (p, "-fident"))
604 else if (!strcmp (p, "-ansi"))
605 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
606 else if (!strcmp (p, "-Wimplicit"))
608 else if (!strcmp (p, "-Wno-implicit"))
610 else if (!strcmp (p, "-Wwrite-strings"))
611 warn_write_strings = 1;
612 else if (!strcmp (p, "-Wno-write-strings"))
613 warn_write_strings = 0;
614 else if (!strcmp (p, "-Wcast-qual"))
616 else if (!strcmp (p, "-Wno-cast-qual"))
618 else if (!strcmp (p, "-Wpointer-arith"))
619 warn_pointer_arith = 1;
620 else if (!strcmp (p, "-Wno-pointer-arith"))
621 warn_pointer_arith = 0;
622 else if (!strcmp (p, "-Wstrict-prototypes"))
623 warn_strict_prototypes = 1;
624 else if (!strcmp (p, "-Wno-strict-prototypes"))
625 warn_strict_prototypes = 0;
626 else if (!strcmp (p, "-Wmissing-prototypes"))
627 warn_missing_prototypes = 1;
628 else if (!strcmp (p, "-Wno-missing-prototypes"))
629 warn_missing_prototypes = 0;
630 else if (!strcmp (p, "-Wredundant-decls"))
631 warn_redundant_decls = 1;
632 else if (!strcmp (p, "-Wno-redundant-decls"))
633 warn_redundant_decls = 0;
634 else if (!strcmp (p, "-Wnested-externs"))
635 warn_nested_externs = 1;
636 else if (!strcmp (p, "-Wno-nested-externs"))
637 warn_nested_externs = 0;
638 else if (!strcmp (p, "-Wtraditional"))
639 warn_traditional = 1;
640 else if (!strcmp (p, "-Wno-traditional"))
641 warn_traditional = 0;
642 else if (!strcmp (p, "-Wformat"))
644 else if (!strcmp (p, "-Wno-format"))
646 else if (!strcmp (p, "-Wchar-subscripts"))
647 warn_char_subscripts = 1;
648 else if (!strcmp (p, "-Wno-char-subscripts"))
649 warn_char_subscripts = 0;
650 else if (!strcmp (p, "-Wconversion"))
652 else if (!strcmp (p, "-Wno-conversion"))
654 else if (!strcmp (p, "-Wparentheses"))
655 warn_parentheses = 1;
656 else if (!strcmp (p, "-Wno-parentheses"))
657 warn_parentheses = 0;
658 else if (!strcmp (p, "-Wreturn-type"))
659 warn_return_type = 1;
660 else if (!strcmp (p, "-Wno-return-type"))
661 warn_return_type = 0;
662 else if (!strcmp (p, "-Wcomment"))
663 ; /* cpp handles this one. */
664 else if (!strcmp (p, "-Wno-comment"))
665 ; /* cpp handles this one. */
666 else if (!strcmp (p, "-Wcomments"))
667 ; /* cpp handles this one. */
668 else if (!strcmp (p, "-Wno-comments"))
669 ; /* cpp handles this one. */
670 else if (!strcmp (p, "-Wtrigraphs"))
671 ; /* cpp handles this one. */
672 else if (!strcmp (p, "-Wno-trigraphs"))
673 ; /* cpp handles this one. */
674 else if (!strcmp (p, "-Wimport"))
675 ; /* cpp handles this one. */
676 else if (!strcmp (p, "-Wno-import"))
677 ; /* cpp handles this one. */
678 else if (!strcmp (p, "-Wmissing-braces"))
679 warn_missing_braces = 1;
680 else if (!strcmp (p, "-Wno-missing-braces"))
681 warn_missing_braces = 0;
682 else if (!strcmp (p, "-Wall"))
685 /* We save the value of warn_uninitialized, since if they put
686 -Wuninitialized on the command line, we need to generate a
687 warning about not using it without also specifying -O. */
688 if (warn_uninitialized != 1)
689 warn_uninitialized = 2;
691 warn_return_type = 1;
695 warn_char_subscripts = 1;
696 warn_parentheses = 1;
697 warn_missing_braces = 1;
705 /* Hooks for print_node. */
708 print_lang_decl (file, node, indent)
716 print_lang_type (file, node, indent)
724 print_lang_identifier (file, node, indent)
729 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
730 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
731 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
732 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
733 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
734 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
737 /* Hook called at end of compilation to assume 1 elt
738 for a top-level array decl that wasn't complete before. */
741 finish_incomplete_decl (decl)
744 if (TREE_CODE (decl) == VAR_DECL && TREE_TYPE (decl) != error_mark_node)
746 tree type = TREE_TYPE (decl);
747 if (TREE_CODE (type) == ARRAY_TYPE
748 && TYPE_DOMAIN (type) == 0
749 && TREE_CODE (decl) != TYPE_DECL)
751 complete_array_type (type, NULL_TREE, 1);
753 layout_decl (decl, 0);
758 /* Create a new `struct binding_level'. */
761 struct binding_level *
762 make_binding_level ()
765 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
768 /* Nonzero if we are currently in the global binding level. */
773 return current_binding_level == global_binding_level;
779 keep_next_level_flag = 1;
782 /* Nonzero if the current level needs to have a BLOCK made. */
787 return ((current_binding_level->keep_if_subblocks
788 && current_binding_level->blocks != 0)
789 || current_binding_level->keep
790 || current_binding_level->names != 0
791 || (current_binding_level->tags != 0
792 && !current_binding_level->tag_transparent));
795 /* Identify this binding level as a level of parameters.
796 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
797 But it turns out there is no way to pass the right value for
798 DEFINITION_FLAG, so we ignore it. */
801 declare_parm_level (definition_flag)
804 current_binding_level->parm_flag = 1;
807 /* Nonzero if currently making parm declarations. */
812 return current_binding_level->parm_flag;
815 /* Enter a new binding level.
816 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
817 not for that of tags. */
820 pushlevel (tag_transparent)
823 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
825 /* If this is the top level of a function,
826 just make sure that NAMED_LABELS is 0. */
828 if (current_binding_level == global_binding_level)
833 /* Reuse or create a struct for this binding level. */
835 if (free_binding_level)
837 newlevel = free_binding_level;
838 free_binding_level = free_binding_level->level_chain;
842 newlevel = make_binding_level ();
845 /* Add this level to the front of the chain (stack) of levels that
848 *newlevel = clear_binding_level;
849 newlevel->tag_transparent
851 || (current_binding_level
852 ? current_binding_level->subblocks_tag_transparent
854 newlevel->level_chain = current_binding_level;
855 current_binding_level = newlevel;
856 newlevel->keep = keep_next_level_flag;
857 keep_next_level_flag = 0;
858 newlevel->keep_if_subblocks = keep_next_if_subblocks;
859 keep_next_if_subblocks = 0;
862 /* Exit a binding level.
863 Pop the level off, and restore the state of the identifier-decl mappings
864 that were in effect when this level was entered.
866 If KEEP is nonzero, this level had explicit declarations, so
867 and create a "block" (a BLOCK node) for the level
868 to record its declarations and subblocks for symbol table output.
870 If FUNCTIONBODY is nonzero, this level is the body of a function,
871 so create a block as if KEEP were set and also clear out all
874 If REVERSE is nonzero, reverse the order of decls before putting
875 them into the BLOCK. */
878 poplevel (keep, reverse, functionbody)
884 /* The chain of decls was accumulated in reverse order.
885 Put it into forward order, just for cleanliness. */
887 tree tags = current_binding_level->tags;
888 tree subblocks = current_binding_level->blocks;
891 int block_previously_created;
893 keep |= current_binding_level->keep;
895 /* This warning is turned off because it causes warnings for
896 declarations like `extern struct foo *x'. */
898 /* Warn about incomplete structure types in this level. */
899 for (link = tags; link; link = TREE_CHAIN (link))
900 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
902 tree type = TREE_VALUE (link);
904 switch (TREE_CODE (type))
907 errmsg = "`struct %s' incomplete in scope ending here";
910 errmsg = "`union %s' incomplete in scope ending here";
913 errmsg = "`enum %s' incomplete in scope ending here";
916 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
917 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
919 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
920 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
924 /* Get the decls in the order they were written.
925 Usually current_binding_level->names is in reverse order.
926 But parameter decls were previously put in forward order. */
929 current_binding_level->names
930 = decls = nreverse (current_binding_level->names);
932 decls = current_binding_level->names;
934 /* Output any nested inline functions within this block
935 if they weren't already output. */
937 for (decl = decls; decl; decl = TREE_CHAIN (decl))
938 if (TREE_CODE (decl) == FUNCTION_DECL
939 && ! TREE_ASM_WRITTEN (decl)
940 && DECL_INITIAL (decl) != 0
941 && TREE_ADDRESSABLE (decl))
943 /* If this decl was copied from a file-scope decl
944 on account of a block-scope extern decl,
945 propagate TREE_ADDRESSABLE to the file-scope decl. */
946 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
947 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
950 push_function_context ();
951 output_inline_function (decl);
952 pop_function_context ();
956 /* If there were any declarations or structure tags in that level,
957 or if this level is a function body,
958 create a BLOCK to record them for the life of this function. */
961 block_previously_created = (current_binding_level->this_block != 0);
962 if (block_previously_created)
963 block = current_binding_level->this_block;
964 else if (keep || functionbody
965 || (current_binding_level->keep_if_subblocks && subblocks != 0))
966 block = make_node (BLOCK);
969 BLOCK_VARS (block) = decls;
970 BLOCK_TYPE_TAGS (block) = tags;
971 BLOCK_SUBBLOCKS (block) = subblocks;
972 remember_end_note (block);
975 /* In each subblock, record that this is its superior. */
977 for (link = subblocks; link; link = TREE_CHAIN (link))
978 BLOCK_SUPERCONTEXT (link) = block;
980 /* Clear out the meanings of the local variables of this level. */
982 for (link = decls; link; link = TREE_CHAIN (link))
984 if (DECL_NAME (link) != 0)
986 /* If the ident. was used or addressed via a local extern decl,
987 don't forget that fact. */
988 if (DECL_EXTERNAL (link))
990 if (TREE_USED (link))
991 TREE_USED (DECL_NAME (link)) = 1;
992 if (TREE_ADDRESSABLE (link))
993 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
995 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
999 /* Restore all name-meanings of the outer levels
1000 that were shadowed by this level. */
1002 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1003 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1005 /* If the level being exited is the top level of a function,
1006 check over all the labels, and clear out the current
1007 (function local) meanings of their names. */
1011 /* If this is the top level block of a function,
1012 the vars are the function's parameters.
1013 Don't leave them in the BLOCK because they are
1014 found in the FUNCTION_DECL instead. */
1016 BLOCK_VARS (block) = 0;
1018 /* Clear out the definitions of all label names,
1019 since their scopes end here,
1020 and add them to BLOCK_VARS. */
1022 for (link = named_labels; link; link = TREE_CHAIN (link))
1024 register tree label = TREE_VALUE (link);
1026 if (DECL_INITIAL (label) == 0)
1028 error_with_decl (label, "label `%s' used but not defined");
1029 /* Avoid crashing later. */
1030 define_label (input_filename, lineno,
1033 else if (warn_unused && !TREE_USED (label))
1034 warning_with_decl (label, "label `%s' defined but not used");
1035 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1037 /* Put the labels into the "variables" of the
1038 top-level block, so debugger can see them. */
1039 TREE_CHAIN (label) = BLOCK_VARS (block);
1040 BLOCK_VARS (block) = label;
1044 /* Pop the current level, and free the structure for reuse. */
1047 register struct binding_level *level = current_binding_level;
1048 current_binding_level = current_binding_level->level_chain;
1050 level->level_chain = free_binding_level;
1051 free_binding_level = level;
1054 /* Dispose of the block that we just made inside some higher level. */
1056 DECL_INITIAL (current_function_decl) = block;
1059 if (!block_previously_created)
1060 current_binding_level->blocks
1061 = chainon (current_binding_level->blocks, block);
1063 /* If we did not make a block for the level just exited,
1064 any blocks made for inner levels
1065 (since they cannot be recorded as subblocks in that level)
1066 must be carried forward so they will later become subblocks
1067 of something else. */
1069 current_binding_level->blocks
1070 = chainon (current_binding_level->blocks, subblocks);
1072 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1073 binding contour so that they point to the appropriate construct, i.e.
1074 either to the current FUNCTION_DECL node, or else to the BLOCK node
1075 we just constructed.
1077 Note that for tagged types whose scope is just the formal parameter
1078 list for some function type specification, we can't properly set
1079 their TYPE_CONTEXTs here, because we don't have a pointer to the
1080 appropriate FUNCTION_TYPE node readily available to us. For those
1081 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1082 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1083 node which will represent the "scope" for these "parameter list local"
1088 for (link = tags; link; link = TREE_CHAIN (link))
1089 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1091 for (link = tags; link; link = TREE_CHAIN (link))
1092 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1095 TREE_USED (block) = 1;
1099 /* Delete the node BLOCK from the current binding level.
1100 This is used for the block inside a stmt expr ({...})
1101 so that the block can be reinserted where appropriate. */
1104 delete_block (block)
1108 if (current_binding_level->blocks == block)
1109 current_binding_level->blocks = TREE_CHAIN (block);
1110 for (t = current_binding_level->blocks; t;)
1112 if (TREE_CHAIN (t) == block)
1113 TREE_CHAIN (t) = TREE_CHAIN (block);
1117 TREE_CHAIN (block) = NULL;
1118 /* Clear TREE_USED which is always set by poplevel.
1119 The flag is set again if insert_block is called. */
1120 TREE_USED (block) = 0;
1123 /* Insert BLOCK at the end of the list of subblocks of the
1124 current binding level. This is used when a BIND_EXPR is expanded,
1125 to handle the BLOCK node inside the BIND_EXPR. */
1128 insert_block (block)
1131 TREE_USED (block) = 1;
1132 current_binding_level->blocks
1133 = chainon (current_binding_level->blocks, block);
1136 /* Set the BLOCK node for the innermost scope
1137 (the one we are currently in). */
1141 register tree block;
1143 current_binding_level->this_block = block;
1149 register struct binding_level *newlevel;
1151 /* Reuse or create a struct for this binding level. */
1153 if (free_binding_level)
1155 newlevel = free_binding_level;
1156 free_binding_level = free_binding_level->level_chain;
1160 newlevel = make_binding_level ();
1163 /* Add this level to the front of the chain (stack) of label levels. */
1165 newlevel->level_chain = label_level_chain;
1166 label_level_chain = newlevel;
1168 newlevel->names = named_labels;
1169 newlevel->shadowed = shadowed_labels;
1171 shadowed_labels = 0;
1177 register struct binding_level *level = label_level_chain;
1180 /* Clear out the definitions of the declared labels in this level.
1181 Leave in the list any ordinary, non-declared labels. */
1182 for (link = named_labels, prev = 0; link;)
1184 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1186 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1188 error_with_decl (TREE_VALUE (link),
1189 "label `%s' used but not defined");
1190 /* Avoid crashing later. */
1191 define_label (input_filename, lineno,
1192 DECL_NAME (TREE_VALUE (link)));
1194 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1195 warning_with_decl (TREE_VALUE (link),
1196 "label `%s' defined but not used");
1197 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1199 /* Delete this element from the list. */
1200 link = TREE_CHAIN (link);
1202 TREE_CHAIN (prev) = link;
1204 named_labels = link;
1209 link = TREE_CHAIN (link);
1213 /* Bring back all the labels that were shadowed. */
1214 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1215 if (DECL_NAME (TREE_VALUE (link)) != 0)
1216 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1217 = TREE_VALUE (link);
1219 named_labels = chainon (named_labels, level->names);
1220 shadowed_labels = level->shadowed;
1222 /* Pop the current level, and free the structure for reuse. */
1223 label_level_chain = label_level_chain->level_chain;
1224 level->level_chain = free_binding_level;
1225 free_binding_level = level;
1228 /* Push a definition or a declaration of struct, union or enum tag "name".
1229 "type" should be the type node.
1230 We assume that the tag "name" is not already defined.
1232 Note that the definition may really be just a forward reference.
1233 In that case, the TYPE_SIZE will be zero. */
1236 pushtag (name, type)
1239 register struct binding_level *b;
1241 /* Find the proper binding level for this type tag. */
1243 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1248 /* Record the identifier as the type's name if it has none. */
1250 if (TYPE_NAME (type) == 0)
1251 TYPE_NAME (type) = name;
1254 if (b == global_binding_level)
1255 b->tags = perm_tree_cons (name, type, b->tags);
1257 b->tags = saveable_tree_cons (name, type, b->tags);
1259 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1260 tagged type we just added to the current binding level. This fake
1261 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1262 to output a representation of a tagged type, and it also gives
1263 us a convenient place to record the "scope start" address for the
1266 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1269 /* Handle when a new declaration NEWDECL
1270 has the same name as an old one OLDDECL
1271 in the same binding contour.
1272 Prints an error message if appropriate.
1274 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1275 Otherwise, return 0. */
1278 duplicate_decls (newdecl, olddecl)
1279 register tree newdecl, olddecl;
1281 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1282 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1283 && DECL_INITIAL (newdecl) != 0);
1284 tree oldtype = TREE_TYPE (olddecl);
1285 tree newtype = TREE_TYPE (newdecl);
1287 if (TREE_CODE (newtype) == ERROR_MARK
1288 || TREE_CODE (oldtype) == ERROR_MARK)
1291 /* New decl is completely inconsistent with the old one =>
1292 tell caller to replace the old one.
1293 This is always an error except in the case of shadowing a builtin. */
1294 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1296 if (TREE_CODE (olddecl) == FUNCTION_DECL
1297 && (DECL_BUILT_IN (olddecl)
1298 || DECL_BUILT_IN_NONANSI (olddecl)))
1300 /* If you declare a built-in or predefined function name as static,
1301 the old definition is overridden,
1302 but optionally warn this was a bad choice of name. */
1303 if (!TREE_PUBLIC (newdecl))
1307 else if (DECL_BUILT_IN (olddecl))
1308 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1310 warning_with_decl (newdecl, "shadowing library function `%s'");
1312 /* Likewise, if the built-in is not ansi, then programs can
1313 override it even globally without an error. */
1314 else if (! DECL_BUILT_IN (olddecl))
1315 warning_with_decl (newdecl,
1316 "library function `%s' declared as non-function");
1318 else if (DECL_BUILT_IN_NONANSI (olddecl))
1319 warning_with_decl (newdecl,
1320 "built-in function `%s' declared as non-function");
1322 warning_with_decl (newdecl,
1323 "built-in 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 = signed_type (wchar_type_node);
2752 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
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 /* Prepare to check format strings against argument lists. */
3062 init_function_format_info ();
3066 incomplete_decl_finalize_hook = finish_incomplete_decl;
3069 /* Return a definition for a builtin function named NAME and whose data type
3070 is TYPE. TYPE should be a function type with argument types.
3071 FUNCTION_CODE tells later passes how to compile calls to this function.
3072 See tree.h for its possible values.
3074 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3075 the name to be called if we can't opencode the function. */
3078 builtin_function (name, type, function_code, library_name)
3081 enum built_in_function function_code;
3084 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3085 DECL_EXTERNAL (decl) = 1;
3086 TREE_PUBLIC (decl) = 1;
3087 /* If -traditional, permit redefining a builtin function any way you like.
3088 (Though really, if the program redefines these functions,
3089 it probably won't work right unless compiled with -fno-builtin.) */
3090 if (flag_traditional && name[0] != '_')
3091 DECL_BUILT_IN_NONANSI (decl) = 1;
3093 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3094 make_decl_rtl (decl, NULL_PTR, 1);
3096 if (function_code != NOT_BUILT_IN)
3098 DECL_BUILT_IN (decl) = 1;
3099 DECL_SET_FUNCTION_CODE (decl, function_code);
3101 /* Warn if a function in the namespace for users
3102 is used without an occasion to consider it declared. */
3103 if (name[0] != '_' || name[1] != '_')
3104 C_DECL_ANTICIPATED (decl) = 1;
3109 /* Called when a declaration is seen that contains no names to declare.
3110 If its type is a reference to a structure, union or enum inherited
3111 from a containing scope, shadow that tag name for the current scope
3112 with a forward reference.
3113 If its type defines a new named structure or union
3114 or defines an enum, it is valid but we need not do anything here.
3115 Otherwise, it is an error. */
3118 shadow_tag (declspecs)
3121 shadow_tag_warned (declspecs, 0);
3125 shadow_tag_warned (declspecs, warned)
3128 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3134 pending_invalid_xref = 0;
3136 for (link = declspecs; link; link = TREE_CHAIN (link))
3138 register tree value = TREE_VALUE (link);
3139 register enum tree_code code = TREE_CODE (value);
3141 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3142 /* Used to test also that TYPE_SIZE (value) != 0.
3143 That caused warning for `struct foo;' at top level in the file. */
3145 register tree name = lookup_tag_reverse (value);
3152 if (warned != 1 && code != ENUMERAL_TYPE)
3153 /* Empty unnamed enum OK */
3155 pedwarn ("unnamed struct/union that defines no instances");
3161 t = lookup_tag (code, name, current_binding_level, 1);
3165 t = make_node (code);
3174 warning ("useless keyword or type name in empty declaration");
3181 error ("two types specified in one empty declaration");
3186 pedwarn ("empty declaration");
3190 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3193 groktypename (typename)
3196 if (TREE_CODE (typename) != TREE_LIST)
3198 return grokdeclarator (TREE_VALUE (typename),
3199 TREE_PURPOSE (typename),
3203 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3206 groktypename_in_parm_context (typename)
3209 if (TREE_CODE (typename) != TREE_LIST)
3211 return grokdeclarator (TREE_VALUE (typename),
3212 TREE_PURPOSE (typename),
3216 /* Decode a declarator in an ordinary declaration or data definition.
3217 This is called as soon as the type information and variable name
3218 have been parsed, before parsing the initializer if any.
3219 Here we create the ..._DECL node, fill in its type,
3220 and put it on the list of decls for the current context.
3221 The ..._DECL node is returned as the value.
3223 Exception: for arrays where the length is not specified,
3224 the type is left null, to be filled in by `finish_decl'.
3226 Function definitions do not come here; they go to start_function
3227 instead. However, external and forward declarations of functions
3228 do go through here. Structure field declarations are done by
3229 grokfield and not through here. */
3231 /* Set this to zero to debug not using the temporary obstack
3232 to parse initializers. */
3233 int debug_temp_inits = 1;
3236 start_decl (declarator, declspecs, initialized)
3237 tree declarator, declspecs;
3240 register tree decl = grokdeclarator (declarator, declspecs,
3241 NORMAL, initialized);
3243 int init_written = initialized;
3245 /* The corresponding pop_obstacks is in finish_decl. */
3246 push_obstacks_nochange ();
3249 /* Is it valid for this decl to have an initializer at all?
3250 If not, set INITIALIZED to zero, which will indirectly
3251 tell `finish_decl' to ignore the initializer once it is parsed. */
3252 switch (TREE_CODE (decl))
3255 /* typedef foo = bar means give foo the same type as bar.
3256 We haven't parsed bar yet, so `finish_decl' will fix that up.
3257 Any other case of an initialization in a TYPE_DECL is an error. */
3258 if (pedantic || list_length (declspecs) > 1)
3260 error ("typedef `%s' is initialized",
3261 IDENTIFIER_POINTER (DECL_NAME (decl)));
3267 error ("function `%s' is initialized like a variable",
3268 IDENTIFIER_POINTER (DECL_NAME (decl)));
3273 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3274 error ("parameter `%s' is initialized",
3275 IDENTIFIER_POINTER (DECL_NAME (decl)));
3280 /* Don't allow initializations for incomplete types
3281 except for arrays which might be completed by the initialization. */
3282 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3284 /* A complete type is ok if size is fixed. */
3286 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3287 || C_DECL_VARIABLE_SIZE (decl))
3289 error ("variable-sized object may not be initialized");
3293 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3295 error ("variable `%s' has initializer but incomplete type",
3296 IDENTIFIER_POINTER (DECL_NAME (decl)));
3299 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3301 error ("elements of array `%s' have incomplete type",
3302 IDENTIFIER_POINTER (DECL_NAME (decl)));
3309 #if 0 /* Seems redundant with grokdeclarator. */
3310 if (current_binding_level != global_binding_level
3311 && DECL_EXTERNAL (decl)
3312 && TREE_CODE (decl) != FUNCTION_DECL)
3313 warning ("declaration of `%s' has `extern' and is initialized",
3314 IDENTIFIER_POINTER (DECL_NAME (decl)));
3316 DECL_EXTERNAL (decl) = 0;
3317 if (current_binding_level == global_binding_level)
3318 TREE_STATIC (decl) = 1;
3320 /* Tell `pushdecl' this is an initialized decl
3321 even though we don't yet have the initializer expression.
3322 Also tell `finish_decl' it may store the real initializer. */
3323 DECL_INITIAL (decl) = error_mark_node;
3326 /* If this is a function declaration, write a record describing it to the
3327 prototypes file (if requested). */
3329 if (TREE_CODE (decl) == FUNCTION_DECL)
3330 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3332 /* Add this decl to the current binding level.
3333 TEM may equal DECL or it may be a previous decl of the same name. */
3334 tem = pushdecl (decl);
3336 /* For C and Obective-C, we by default put things in .common when
3338 DECL_COMMON (tem) = 1;
3340 /* For a local variable, define the RTL now. */
3341 if (current_binding_level != global_binding_level
3342 /* But not if this is a duplicate decl
3343 and we preserved the rtl from the previous one
3344 (which may or may not happen). */
3345 && DECL_RTL (tem) == 0)
3347 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3349 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3350 && DECL_INITIAL (tem) != 0)
3356 /* When parsing and digesting the initializer,
3357 use temporary storage. Do this even if we will ignore the value. */
3358 if (current_binding_level == global_binding_level && debug_temp_inits)
3359 temporary_allocation ();
3365 /* Finish processing of a declaration;
3366 install its initial value.
3367 If the length of an array type is not known before,
3368 it must be determined now, from the initial value, or it is an error. */
3371 finish_decl (decl, init, asmspec_tree)
3375 register tree type = TREE_TYPE (decl);
3376 int was_incomplete = (DECL_SIZE (decl) == 0);
3377 int temporary = allocation_temporary_p ();
3381 asmspec = TREE_STRING_POINTER (asmspec_tree);
3383 /* If `start_decl' didn't like having an initialization, ignore it now. */
3385 if (init != 0 && DECL_INITIAL (decl) == 0)
3387 /* Don't crash if parm is initialized. */
3388 if (TREE_CODE (decl) == PARM_DECL)
3391 if (ITERATOR_P (decl))
3394 error_with_decl (decl, "iterator has no initial value");
3396 init = save_expr (init);
3401 if (TREE_CODE (decl) != TYPE_DECL)
3402 store_init_value (decl, init);
3405 /* typedef foo = bar; store the type of bar as the type of foo. */
3406 TREE_TYPE (decl) = TREE_TYPE (init);
3407 DECL_INITIAL (decl) = init = 0;
3411 /* Pop back to the obstack that is current for this binding level.
3412 This is because MAXINDEX, rtl, etc. to be made below
3413 must go in the permanent obstack. But don't discard the
3414 temporary data yet. */
3416 #if 0 /* pop_obstacks was near the end; this is what was here. */
3417 if (current_binding_level == global_binding_level && temporary)
3418 end_temporary_allocation ();
3421 /* Deduce size of array from initialization, if not already known */
3423 if (TREE_CODE (type) == ARRAY_TYPE
3424 && TYPE_DOMAIN (type) == 0
3425 && TREE_CODE (decl) != TYPE_DECL)
3428 = (TREE_STATIC (decl)
3429 /* Even if pedantic, an external linkage array
3430 may have incomplete type at first. */
3431 ? pedantic && !TREE_PUBLIC (decl)
3432 : !DECL_EXTERNAL (decl));
3434 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3436 /* Get the completed type made by complete_array_type. */
3437 type = TREE_TYPE (decl);
3440 error_with_decl (decl, "initializer fails to determine size of `%s'");
3445 error_with_decl (decl, "array size missing in `%s'");
3446 /* If a `static' var's size isn't known,
3447 make it extern as well as static, so it does not get
3449 If it is not `static', then do not mark extern;
3450 finish_incomplete_decl will give it a default size
3451 and it will get allocated. */
3452 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3453 DECL_EXTERNAL (decl) = 1;
3456 if (pedantic && TYPE_DOMAIN (type) != 0
3457 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3459 error_with_decl (decl, "zero-size array `%s'");
3461 layout_decl (decl, 0);
3464 if (TREE_CODE (decl) == VAR_DECL)
3466 if (DECL_SIZE (decl) == 0
3467 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3468 layout_decl (decl, 0);
3470 if (DECL_SIZE (decl) == 0
3471 && (TREE_STATIC (decl)
3473 /* A static variable with an incomplete type
3474 is an error if it is initialized.
3475 Also if it is not file scope.
3476 Otherwise, let it through, but if it is not `extern'
3477 then it may cause an error message later. */
3478 (DECL_INITIAL (decl) != 0
3479 || current_binding_level != global_binding_level)
3481 /* An automatic variable with an incomplete type
3483 !DECL_EXTERNAL (decl)))
3485 error_with_decl (decl, "storage size of `%s' isn't known");
3486 TREE_TYPE (decl) = error_mark_node;
3489 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3490 && DECL_SIZE (decl) != 0)
3492 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3493 constant_expression_warning (DECL_SIZE (decl));
3495 error_with_decl (decl, "storage size of `%s' isn't constant");
3499 /* Output the assembler code and/or RTL code for variables and functions,
3500 unless the type is an undefined structure or union.
3501 If not, it will get done when the type is completed. */
3503 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3505 if (flag_traditional && allocation_temporary_p ())
3507 push_obstacks_nochange ();
3508 end_temporary_allocation ();
3509 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3510 maybe_objc_check_decl (decl);
3511 rest_of_decl_compilation (decl, asmspec,
3512 current_binding_level == global_binding_level,
3518 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3519 maybe_objc_check_decl (decl);
3520 rest_of_decl_compilation (decl, asmspec,
3521 current_binding_level == global_binding_level,
3524 if (current_binding_level != global_binding_level)
3526 /* Recompute the RTL of a local array now
3527 if it used to be an incomplete type. */
3529 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3531 /* If we used it already as memory, it must stay in memory. */
3532 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3533 /* If it's still incomplete now, no init will save it. */
3534 if (DECL_SIZE (decl) == 0)
3535 DECL_INITIAL (decl) = 0;
3538 /* Compute and store the initial value. */
3539 if (TREE_CODE (decl) != FUNCTION_DECL)
3540 expand_decl_init (decl);
3544 if (TREE_CODE (decl) == TYPE_DECL)
3546 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3547 maybe_objc_check_decl (decl);
3548 rest_of_decl_compilation (decl, NULL_PTR,
3549 current_binding_level == global_binding_level,
3553 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3554 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3555 && temporary && TREE_PERMANENT (decl)
3556 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3557 space with DECL_ARG_TYPE. */
3558 && TREE_CODE (decl) != PARM_DECL)
3560 /* We need to remember that this array HAD an initialization,
3561 but discard the actual temporary nodes,
3562 since we can't have a permanent node keep pointing to them. */
3563 /* We make an exception for inline functions, since it's
3564 normal for a local extern redeclaration of an inline function
3565 to have a copy of the top-level decl's DECL_INLINE. */
3566 if (DECL_INITIAL (decl) != 0)
3568 /* If this is a static const variable, then preserve the
3569 initializer instead of discarding it so that we can optimize
3570 references to it. */
3571 if (TREE_STATIC (decl) && TREE_READONLY (decl))
3573 preserve_initializer ();
3574 /* Hack? Set the permanent bit for something that is permanent,
3575 but not on the permenent obstack, so as to convince
3576 output_constant_def to make its rtl on the permanent
3578 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3581 DECL_INITIAL (decl) = error_mark_node;
3586 /* Resume permanent allocation, if not within a function. */
3587 /* The corresponding push_obstacks_nochange is in start_decl,
3588 and in push_parm_decl and in grokfield. */
3592 /* If we have gone back from temporary to permanent allocation,
3593 actually free the temporary space that we no longer need. */
3594 if (temporary && !allocation_temporary_p ())
3595 permanent_allocation ();
3597 /* At the end of a declaration, throw away any variable type sizes
3598 of types defined inside that declaration. There is no use
3599 computing them in the following function definition. */
3600 if (current_binding_level == global_binding_level)
3601 get_pending_sizes ();
3604 /* If DECL has a cleanup, build and return that cleanup here.
3605 This is a callback called by expand_expr. */
3608 maybe_build_cleanup (decl)
3611 /* There are no cleanups in C. */
3615 /* Given a parsed parameter declaration,
3616 decode it into a PARM_DECL and push that on the current binding level.
3617 Also, for the sake of forward parm decls,
3618 record the given order of parms in `parm_order'. */
3621 push_parm_decl (parm)
3625 int old_immediate_size_expand = immediate_size_expand;
3626 /* Don't try computing parm sizes now -- wait till fn is called. */
3627 immediate_size_expand = 0;
3629 /* The corresponding pop_obstacks is in finish_decl. */
3630 push_obstacks_nochange ();
3632 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3635 if (DECL_NAME (decl))
3637 olddecl = lookup_name (DECL_NAME (decl));
3638 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3639 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3643 decl = pushdecl (decl);
3645 immediate_size_expand = old_immediate_size_expand;
3647 current_binding_level->parm_order
3648 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3650 /* Add this decl to the current binding level. */
3651 finish_decl (decl, NULL_TREE, NULL_TREE);
3654 /* Clear the given order of parms in `parm_order'.
3655 Used at start of parm list,
3656 and also at semicolon terminating forward decls. */
3661 current_binding_level->parm_order = NULL_TREE;
3664 /* Make TYPE a complete type based on INITIAL_VALUE.
3665 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3666 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3669 complete_array_type (type, initial_value, do_default)
3674 register tree maxindex = NULL_TREE;
3679 /* Note MAXINDEX is really the maximum index,
3680 one less than the size. */
3681 if (TREE_CODE (initial_value) == STRING_CST)
3684 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3685 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3688 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3690 tree elts = CONSTRUCTOR_ELTS (initial_value);
3691 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3692 for (; elts; elts = TREE_CHAIN (elts))
3694 if (TREE_PURPOSE (elts))
3695 maxindex = TREE_PURPOSE (elts);
3697 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3699 maxindex = copy_node (maxindex);
3703 /* Make an error message unless that happened already. */
3704 if (initial_value != error_mark_node)
3707 /* Prevent further error messages. */
3708 maxindex = build_int_2 (0, 0);
3715 maxindex = build_int_2 (0, 0);
3721 TYPE_DOMAIN (type) = build_index_type (maxindex);
3722 if (!TREE_TYPE (maxindex))
3723 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3724 #if 0 /* I took out this change
3725 together with the change in build_array_type. --rms */
3726 change_main_variant (type,
3727 build_array_type (TREE_TYPE (type),
3728 TYPE_DOMAIN (type)));
3732 /* Lay out the type now that we can get the real answer. */
3739 /* Given declspecs and a declarator,
3740 determine the name and type of the object declared
3741 and construct a ..._DECL node for it.
3742 (In one case we can return a ..._TYPE node instead.
3743 For invalid input we sometimes return 0.)
3745 DECLSPECS is a chain of tree_list nodes whose value fields
3746 are the storage classes and type specifiers.
3748 DECL_CONTEXT says which syntactic context this declaration is in:
3749 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3750 FUNCDEF for a function definition. Like NORMAL but a few different
3751 error messages in each case. Return value may be zero meaning
3752 this definition is too screwy to try to parse.
3753 PARM for a parameter declaration (either within a function prototype
3754 or before a function body). Make a PARM_DECL, or return void_type_node.
3755 TYPENAME if for a typename (in a cast or sizeof).
3756 Don't make a DECL node; just return the ..._TYPE node.
3757 FIELD for a struct or union field; make a FIELD_DECL.
3758 BITFIELD for a field with specified width.
3759 INITIALIZED is 1 if the decl has an initializer.
3761 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3762 It may also be so in the PARM case, for a prototype where the
3763 argument type is specified but not the name.
3765 This function is where the complicated C meanings of `static'
3766 and `extern' are interpreted. */
3769 grokdeclarator (declarator, declspecs, decl_context, initialized)
3772 enum decl_context decl_context;
3777 tree type = NULL_TREE;
3782 int explicit_int = 0;
3783 int explicit_char = 0;
3784 int defaulted_int = 0;
3785 tree typedef_decl = 0;
3787 tree typedef_type = 0;
3788 int funcdef_flag = 0;
3789 enum tree_code innermost_code = ERROR_MARK;
3791 int size_varies = 0;
3793 if (decl_context == BITFIELD)
3794 bitfield = 1, decl_context = FIELD;
3796 if (decl_context == FUNCDEF)
3797 funcdef_flag = 1, decl_context = NORMAL;
3799 push_obstacks_nochange ();
3801 if (flag_traditional && allocation_temporary_p ())
3802 end_temporary_allocation ();
3804 /* Look inside a declarator for the name being declared
3805 and get it as a string, for an error message. */
3807 register tree decl = declarator;
3811 switch (TREE_CODE (decl))
3816 innermost_code = TREE_CODE (decl);
3817 decl = TREE_OPERAND (decl, 0);
3820 case IDENTIFIER_NODE:
3821 name = IDENTIFIER_POINTER (decl);
3832 /* A function definition's declarator must have the form of
3833 a function declarator. */
3835 if (funcdef_flag && innermost_code != CALL_EXPR)
3838 /* Anything declared one level down from the top level
3839 must be one of the parameters of a function
3840 (because the body is at least two levels down). */
3842 /* If this looks like a function definition, make it one,
3843 even if it occurs where parms are expected.
3844 Then store_parm_decls will reject it and not use it as a parm. */
3845 if (decl_context == NORMAL && !funcdef_flag
3846 && current_binding_level->level_chain == global_binding_level)
3847 decl_context = PARM;
3849 /* Look through the decl specs and record which ones appear.
3850 Some typespecs are defined as built-in typenames.
3851 Others, the ones that are modifiers of other types,
3852 are represented by bits in SPECBITS: set the bits for
3853 the modifiers that appear. Storage class keywords are also in SPECBITS.
3855 If there is a typedef name or a type, store the type in TYPE.
3856 This includes builtin typedefs such as `int'.
3858 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3859 and did not come from a user typedef.
3861 Set LONGLONG if `long' is mentioned twice. */
3863 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3866 register tree id = TREE_VALUE (spec);
3868 if (id == ridpointers[(int) RID_INT])
3870 if (id == ridpointers[(int) RID_CHAR])
3873 if (TREE_CODE (id) == IDENTIFIER_NODE)
3874 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3876 if (ridpointers[i] == id)
3878 if (i == (int) RID_LONG && specbits & (1<<i))
3881 error ("`long long long' is too long for GCC");
3885 pedwarn ("ANSI C does not support `long long'");
3889 else if (specbits & (1 << i))
3890 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3896 error ("two or more data types in declaration of `%s'", name);
3897 /* Actual typedefs come to us as TYPE_DECL nodes. */
3898 else if (TREE_CODE (id) == TYPE_DECL)
3900 type = TREE_TYPE (id);
3903 /* Built-in types come as identifiers. */
3904 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3906 register tree t = lookup_name (id);
3907 if (TREE_TYPE (t) == error_mark_node)
3909 else if (!t || TREE_CODE (t) != TYPE_DECL)
3910 error ("`%s' fails to be a typedef or built in type",
3911 IDENTIFIER_POINTER (id));
3914 type = TREE_TYPE (t);
3918 else if (TREE_CODE (id) != ERROR_MARK)
3924 typedef_type = type;
3926 size_varies = C_TYPE_VARIABLE_SIZE (type);
3928 /* No type at all: default to `int', and set DEFAULTED_INT
3929 because it was not a user-defined typedef. */
3933 if (funcdef_flag && warn_return_type
3934 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3935 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3936 warn_about_return_type = 1;
3938 type = integer_type_node;
3941 /* Now process the modifiers that were specified
3942 and check for invalid combinations. */
3944 /* Long double is a special combination. */
3946 if ((specbits & 1 << (int) RID_LONG)
3947 && TYPE_MAIN_VARIANT (type) == double_type_node)
3949 specbits &= ~ (1 << (int) RID_LONG);
3950 type = long_double_type_node;
3953 /* Check all other uses of type modifiers. */
3955 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3956 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3960 if (TREE_CODE (type) != INTEGER_TYPE)
3961 error ("long, short, signed or unsigned invalid for `%s'", name);
3962 else if ((specbits & 1 << (int) RID_LONG)
3963 && (specbits & 1 << (int) RID_SHORT))
3964 error ("long and short specified together for `%s'", name);
3965 else if (((specbits & 1 << (int) RID_LONG)
3966 || (specbits & 1 << (int) RID_SHORT))
3968 error ("long or short specified with char for `%s'", name);
3969 else if (((specbits & 1 << (int) RID_LONG)
3970 || (specbits & 1 << (int) RID_SHORT))
3971 && TREE_CODE (type) == REAL_TYPE)
3972 error ("long or short specified with floating type for `%s'", name);
3973 else if ((specbits & 1 << (int) RID_SIGNED)
3974 && (specbits & 1 << (int) RID_UNSIGNED))
3975 error ("signed and unsigned given together for `%s'", name);
3979 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
3981 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3983 if (flag_pedantic_errors)
3988 /* Discard the type modifiers if they are invalid. */
3991 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3992 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3997 if ((specbits & (1 << (int) RID_COMPLEX))
3998 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4000 error ("complex invalid for `%s'", name);
4001 specbits &= ~ (1 << (int) RID_COMPLEX);
4004 /* Decide whether an integer type is signed or not.
4005 Optionally treat bitfields as signed by default. */
4006 if (specbits & 1 << (int) RID_UNSIGNED
4007 /* Traditionally, all bitfields are unsigned. */
4008 || (bitfield && flag_traditional
4009 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4010 || (bitfield && ! flag_signed_bitfields
4011 && (explicit_int || defaulted_int || explicit_char
4012 /* A typedef for plain `int' without `signed'
4013 can be controlled just like plain `int'. */
4014 || ! (typedef_decl != 0
4015 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4016 && TREE_CODE (type) != ENUMERAL_TYPE
4017 && !(specbits & 1 << (int) RID_SIGNED)))
4020 type = long_long_unsigned_type_node;
4021 else if (specbits & 1 << (int) RID_LONG)
4022 type = long_unsigned_type_node;
4023 else if (specbits & 1 << (int) RID_SHORT)
4024 type = short_unsigned_type_node;
4025 else if (type == char_type_node)
4026 type = unsigned_char_type_node;
4027 else if (typedef_decl)
4028 type = unsigned_type (type);
4030 type = unsigned_type_node;
4032 else if ((specbits & 1 << (int) RID_SIGNED)
4033 && type == char_type_node)
4034 type = signed_char_type_node;
4036 type = long_long_integer_type_node;
4037 else if (specbits & 1 << (int) RID_LONG)
4038 type = long_integer_type_node;
4039 else if (specbits & 1 << (int) RID_SHORT)
4040 type = short_integer_type_node;
4042 if (specbits & 1 << (int) RID_COMPLEX)
4044 /* If we just have "complex", it is equivalent to
4045 "complex double", but if any modifiers at all are specified it is
4046 the complex form of TYPE. E.g, "complex short" is
4047 "complex short int". */
4049 if (defaulted_int && ! longlong
4050 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4051 | (1 << (int) RID_SIGNED)
4052 | (1 << (int) RID_UNSIGNED))))
4053 type = complex_double_type_node;
4054 else if (type == integer_type_node)
4055 type = complex_integer_type_node;
4056 else if (type == float_type_node)
4057 type = complex_float_type_node;
4058 else if (type == double_type_node)
4059 type = complex_double_type_node;
4060 else if (type == long_double_type_node)
4061 type = complex_long_double_type_node;
4063 type = build_complex_type (type);
4066 /* Set CONSTP if this declaration is `const', whether by
4067 explicit specification or via a typedef.
4068 Likewise for VOLATILEP. */
4070 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4071 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4072 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4074 pedwarn ("duplicate `const'");
4076 pedwarn ("duplicate `volatile'");
4077 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4078 type = TYPE_MAIN_VARIANT (type);
4080 /* Warn if two storage classes are given. Default to `auto'. */
4085 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4086 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4087 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4088 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4089 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4090 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4092 /* Warn about storage classes that are invalid for certain
4093 kinds of declarations (parameters, typenames, etc.). */
4096 error ("multiple storage classes in declaration of `%s'", name);
4097 else if (funcdef_flag
4099 & ((1 << (int) RID_REGISTER)
4100 | (1 << (int) RID_AUTO)
4101 | (1 << (int) RID_TYPEDEF))))
4103 if (specbits & 1 << (int) RID_AUTO
4104 && (pedantic || current_binding_level == global_binding_level))
4105 pedwarn ("function definition declared `auto'");
4106 if (specbits & 1 << (int) RID_REGISTER)
4107 error ("function definition declared `register'");
4108 if (specbits & 1 << (int) RID_TYPEDEF)
4109 error ("function definition declared `typedef'");
4110 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4111 | (1 << (int) RID_AUTO));
4113 else if (decl_context != NORMAL && nclasses > 0)
4115 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4119 error ((decl_context == FIELD
4120 ? "storage class specified for structure field `%s'"
4121 : (decl_context == PARM
4122 ? "storage class specified for parameter `%s'"
4123 : "storage class specified for typename")),
4125 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4126 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4127 | (1 << (int) RID_EXTERN));
4130 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4132 /* `extern' with initialization is invalid if not at top level. */
4133 if (current_binding_level == global_binding_level)
4134 warning ("`%s' initialized and declared `extern'", name);
4136 error ("`%s' has both `extern' and initializer", name);
4138 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4139 && current_binding_level != global_binding_level)
4140 error ("nested function `%s' declared `extern'", name);
4141 else if (current_binding_level == global_binding_level
4142 && specbits & (1 << (int) RID_AUTO))
4143 error ("top-level declaration of `%s' specifies `auto'", name);
4144 else if ((specbits & 1 << (int) RID_ITERATOR)
4145 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4147 error ("iterator `%s' has derived type", name);
4148 type = error_mark_node;
4150 else if ((specbits & 1 << (int) RID_ITERATOR)
4151 && TREE_CODE (type) != INTEGER_TYPE)
4153 error ("iterator `%s' has noninteger type", name);
4154 type = error_mark_node;
4158 /* Now figure out the structure of the declarator proper.
4159 Descend through it, creating more complex types, until we reach
4160 the declared identifier (or NULL_TREE, in an absolute declarator). */
4162 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4164 if (type == error_mark_node)
4166 declarator = TREE_OPERAND (declarator, 0);
4170 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4171 an INDIRECT_REF (for *...),
4172 a CALL_EXPR (for ...(...)),
4173 an identifier (for the name being declared)
4174 or a null pointer (for the place in an absolute declarator
4175 where the name was omitted).
4176 For the last two cases, we have just exited the loop.
4178 At this point, TYPE is the type of elements of an array,
4179 or for a function to return, or for a pointer to point to.
4180 After this sequence of ifs, TYPE is the type of the
4181 array or function or pointer, and DECLARATOR has had its
4182 outermost layer removed. */
4184 if (TREE_CODE (declarator) == ARRAY_REF)
4186 register tree itype = NULL_TREE;
4187 register tree size = TREE_OPERAND (declarator, 1);
4188 /* An uninitialized decl with `extern' is a reference. */
4189 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4191 declarator = TREE_OPERAND (declarator, 0);
4193 /* Check for some types that there cannot be arrays of. */
4195 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4197 error ("declaration of `%s' as array of voids", name);
4198 type = error_mark_node;
4201 if (TREE_CODE (type) == FUNCTION_TYPE)
4203 error ("declaration of `%s' as array of functions", name);
4204 type = error_mark_node;
4207 if (size == error_mark_node)
4208 type = error_mark_node;
4210 if (type == error_mark_node)
4213 /* If this is a block level extern, it must live past the end
4214 of the function so that we can check it against other extern
4215 declarations (IDENTIFIER_LIMBO_VALUE). */
4216 if (extern_ref && allocation_temporary_p ())
4217 end_temporary_allocation ();
4219 /* If size was specified, set ITYPE to a range-type for that size.
4220 Otherwise, ITYPE remains null. finish_decl may figure it out
4221 from an initial value. */
4225 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4226 STRIP_TYPE_NOPS (size);
4228 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4229 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4231 error ("size of array `%s' has non-integer type", name);
4232 size = integer_one_node;
4234 if (pedantic && integer_zerop (size))
4235 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4236 if (TREE_CODE (size) == INTEGER_CST)
4238 constant_expression_warning (size);
4239 if (INT_CST_LT (size, integer_zero_node))
4241 error ("size of array `%s' is negative", name);
4242 size = integer_one_node;
4244 itype = build_index_type (size_binop (MINUS_EXPR, size,
4251 if (TREE_CONSTANT (size))
4252 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4254 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4256 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
4258 /* Make sure the array size remains visibly nonconstant
4259 even if it is (eg) a const variable with known value. */
4261 itype = variable_size (itype);
4262 itype = build_index_type (itype);
4266 #if 0 /* This had bad results for pointers to arrays, as in
4267 union incomplete (*foo)[4]; */
4268 /* Complain about arrays of incomplete types, except in typedefs. */
4270 if (TYPE_SIZE (type) == 0
4271 /* Avoid multiple warnings for nested array types. */
4272 && TREE_CODE (type) != ARRAY_TYPE
4273 && !(specbits & (1 << (int) RID_TYPEDEF))
4274 && !C_TYPE_BEING_DEFINED (type))
4275 warning ("array type has incomplete element type");
4278 #if 0 /* We shouldn't have a function type here at all!
4279 Functions aren't allowed as array elements. */
4280 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4281 && (constp || volatilep))
4282 pedwarn ("ANSI C forbids const or volatile function types");
4285 /* Build the array type itself, then merge any constancy or
4286 volatility into the target type. We must do it in this order
4287 to ensure that the TYPE_MAIN_VARIANT field of the array type
4288 is set correctly. */
4290 type = build_array_type (type, itype);
4291 if (constp || volatilep)
4292 type = c_build_type_variant (type, constp, volatilep);
4294 #if 0 /* don't clear these; leave them set so that the array type
4295 or the variable is itself const or volatile. */
4301 C_TYPE_VARIABLE_SIZE (type) = 1;
4303 else if (TREE_CODE (declarator) == CALL_EXPR)
4305 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4306 || current_binding_level == global_binding_level);
4309 /* Declaring a function type.
4310 Make sure we have a valid type for the function to return. */
4311 if (type == error_mark_node)
4316 /* Warn about some types functions can't return. */
4318 if (TREE_CODE (type) == FUNCTION_TYPE)
4320 error ("`%s' declared as function returning a function", name);
4321 type = integer_type_node;
4323 if (TREE_CODE (type) == ARRAY_TYPE)
4325 error ("`%s' declared as function returning an array", name);
4326 type = integer_type_node;
4329 #ifndef TRADITIONAL_RETURN_FLOAT
4330 /* Traditionally, declaring return type float means double. */
4332 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4333 type = double_type_node;
4334 #endif /* TRADITIONAL_RETURN_FLOAT */
4336 /* If this is a block level extern, it must live past the end
4337 of the function so that we can check it against other extern
4338 declarations (IDENTIFIER_LIMBO_VALUE). */
4339 if (extern_ref && allocation_temporary_p ())
4340 end_temporary_allocation ();
4342 /* Construct the function type and go to the next
4343 inner layer of declarator. */
4345 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4347 /* Say it's a definition
4348 only for the CALL_EXPR
4349 closest to the identifier. */
4350 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4351 #if 0 /* This seems to be false. We turn off temporary allocation
4352 above in this function if -traditional.
4353 And this code caused inconsistent results with prototypes:
4354 callers would ignore them, and pass arguments wrong. */
4356 /* Omit the arg types if -traditional, since the arg types
4357 and the list links might not be permanent. */
4358 type = build_function_type (type,
4360 ? NULL_TREE : arg_types);
4362 /* ANSI seems to say that `const int foo ();'
4363 does not make the function foo const. */
4364 if (constp || volatilep)
4365 type = c_build_type_variant (type, constp, volatilep);
4369 type = build_function_type (type, arg_types);
4370 declarator = TREE_OPERAND (declarator, 0);
4372 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4373 the formal parameter list of this FUNCTION_TYPE to point to
4374 the FUNCTION_TYPE node itself. */
4379 for (link = current_function_parm_tags;
4381 link = TREE_CHAIN (link))
4382 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4385 else if (TREE_CODE (declarator) == INDIRECT_REF)
4387 /* Merge any constancy or volatility into the target type
4390 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4391 && (constp || volatilep))
4392 pedwarn ("ANSI C forbids const or volatile function types");
4393 if (constp || volatilep)
4394 type = c_build_type_variant (type, constp, volatilep);
4399 type = build_pointer_type (type);
4401 /* Process a list of type modifier keywords
4402 (such as const or volatile) that were given inside the `*'. */
4404 if (TREE_TYPE (declarator))
4406 register tree typemodlist;
4408 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4409 typemodlist = TREE_CHAIN (typemodlist))
4411 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4413 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4418 error ("invalid type modifier within pointer declarator");
4422 pedwarn ("duplicate `const'");
4424 pedwarn ("duplicate `volatile'");
4427 declarator = TREE_OPERAND (declarator, 0);
4434 /* Now TYPE has the actual type. */
4436 /* If this is declaring a typedef name, return a TYPE_DECL. */
4438 if (specbits & (1 << (int) RID_TYPEDEF))
4441 /* Note that the grammar rejects storage classes
4442 in typenames, fields or parameters */
4443 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4444 && (constp || volatilep))
4445 pedwarn ("ANSI C forbids const or volatile function types");
4446 if (constp || volatilep)
4447 type = c_build_type_variant (type, constp, volatilep);
4449 decl = build_decl (TYPE_DECL, declarator, type);
4450 if ((specbits & (1 << (int) RID_SIGNED))
4451 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4452 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4456 /* Detect the case of an array type of unspecified size
4457 which came, as such, direct from a typedef name.
4458 We must copy the type, so that each identifier gets
4459 a distinct type, so that each identifier's size can be
4460 controlled separately by its own initializer. */
4462 if (type != 0 && typedef_type != 0
4463 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4464 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4466 type = build_array_type (TREE_TYPE (type), 0);
4468 C_TYPE_VARIABLE_SIZE (type) = 1;
4471 /* If this is a type name (such as, in a cast or sizeof),
4472 compute the type and return it now. */
4474 if (decl_context == TYPENAME)
4476 /* Note that the grammar rejects storage classes
4477 in typenames, fields or parameters */
4478 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4479 && (constp || volatilep))
4480 pedwarn ("ANSI C forbids const or volatile function types");
4481 if (constp || volatilep)
4482 type = c_build_type_variant (type, constp, volatilep);
4487 /* Aside from typedefs and type names (handle above),
4488 `void' at top level (not within pointer)
4489 is allowed only in public variables.
4490 We don't complain about parms either, but that is because
4491 a better error message can be made later. */
4493 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4494 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4495 && ((specbits & (1 << (int) RID_EXTERN))
4496 || (current_binding_level == global_binding_level
4498 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4500 error ("variable or field `%s' declared void",
4501 IDENTIFIER_POINTER (declarator));
4502 type = integer_type_node;
4505 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4506 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4511 if (decl_context == PARM)
4513 tree type_as_written = type;
4516 /* A parameter declared as an array of T is really a pointer to T.
4517 One declared as a function is really a pointer to a function. */
4519 if (TREE_CODE (type) == ARRAY_TYPE)
4521 /* Transfer const-ness of array into that of type pointed to. */
4522 type = TREE_TYPE (type);
4523 if (constp || volatilep)
4524 type = c_build_type_variant (type, constp, volatilep);
4525 type = build_pointer_type (type);
4526 volatilep = constp = 0;
4529 else if (TREE_CODE (type) == FUNCTION_TYPE)
4531 if (pedantic && (constp || volatilep))
4532 pedwarn ("ANSI C forbids const or volatile function types");
4533 if (constp || volatilep)
4534 type = c_build_type_variant (type, constp, volatilep);
4535 type = build_pointer_type (type);
4536 volatilep = constp = 0;
4539 decl = build_decl (PARM_DECL, declarator, type);
4541 C_DECL_VARIABLE_SIZE (decl) = 1;
4543 /* Compute the type actually passed in the parmlist,
4544 for the case where there is no prototype.
4545 (For example, shorts and chars are passed as ints.)
4546 When there is a prototype, this is overridden later. */
4548 DECL_ARG_TYPE (decl) = type;
4549 main_type = (type == error_mark_node
4551 : TYPE_MAIN_VARIANT (type));
4552 if (main_type == float_type_node)
4553 DECL_ARG_TYPE (decl) = double_type_node;
4554 /* Don't use TYPE_PRECISION to decide whether to promote,
4555 because we should convert short if it's the same size as int,
4556 but we should not convert long if it's the same size as int. */
4557 else if (TREE_CODE (main_type) != ERROR_MARK
4558 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4560 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4561 && TREE_UNSIGNED (type))
4562 DECL_ARG_TYPE (decl) = unsigned_type_node;
4564 DECL_ARG_TYPE (decl) = integer_type_node;
4567 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4569 else if (decl_context == FIELD)
4571 /* Structure field. It may not be a function. */
4573 if (TREE_CODE (type) == FUNCTION_TYPE)
4575 error ("field `%s' declared as a function",
4576 IDENTIFIER_POINTER (declarator));
4577 type = build_pointer_type (type);
4579 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4581 error ("field `%s' has incomplete type",
4582 IDENTIFIER_POINTER (declarator));
4583 type = error_mark_node;
4585 /* Move type qualifiers down to element of an array. */
4586 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4588 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4590 TYPE_DOMAIN (type));
4591 #if 0 /* Leave the field const or volatile as well. */
4592 constp = volatilep = 0;
4595 decl = build_decl (FIELD_DECL, declarator, type);
4597 C_DECL_VARIABLE_SIZE (decl) = 1;
4599 else if (TREE_CODE (type) == FUNCTION_TYPE)
4601 /* Every function declaration is "external"
4602 except for those which are inside a function body
4603 in which `auto' is used.
4604 That is a case not specified by ANSI C,
4605 and we use it for forward declarations for nested functions. */
4606 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4607 || current_binding_level == global_binding_level);
4609 if (specbits & (1 << (int) RID_AUTO)
4610 && (pedantic || current_binding_level == global_binding_level))
4611 pedwarn ("invalid storage class for function `%s'",
4612 IDENTIFIER_POINTER (declarator));
4613 if (specbits & (1 << (int) RID_REGISTER))
4614 error ("invalid storage class for function `%s'",
4615 IDENTIFIER_POINTER (declarator));
4616 /* Function declaration not at top level.
4617 Storage classes other than `extern' are not allowed
4618 and `extern' makes no difference. */
4619 if (current_binding_level != global_binding_level
4620 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4622 pedwarn ("invalid storage class for function `%s'",
4623 IDENTIFIER_POINTER (declarator));
4625 /* If this is a block level extern, it must live past the end
4626 of the function so that we can check it against other
4627 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4628 if (extern_ref && allocation_temporary_p ())
4629 end_temporary_allocation ();
4631 decl = build_decl (FUNCTION_DECL, declarator, type);
4633 if (pedantic && (constp || volatilep)
4634 && ! DECL_IN_SYSTEM_HEADER (decl))
4635 pedwarn ("ANSI C forbids const or volatile functions");
4638 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4639 warning ("volatile function returns non-void value");
4642 DECL_EXTERNAL (decl) = 1;
4643 /* Record absence of global scope for `static' or `auto'. */
4645 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4646 /* Record presence of `inline', if it is reasonable. */
4649 tree last = tree_last (TYPE_ARG_TYPES (type));
4651 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4652 warning ("cannot inline function `main'");
4653 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4655 warning ("inline declaration ignored for function with `...'");
4657 /* Assume that otherwise the function can be inlined. */
4658 DECL_INLINE (decl) = 1;
4660 if (specbits & (1 << (int) RID_EXTERN))
4661 current_extern_inline = 1;
4666 /* It's a variable. */
4667 /* An uninitialized decl with `extern' is a reference. */
4668 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4670 /* Move type qualifiers down to element of an array. */
4671 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4673 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4675 TYPE_DOMAIN (type));
4676 #if 0 /* Leave the variable const or volatile as well. */
4677 constp = volatilep = 0;
4681 /* If this is a block level extern, it must live past the end
4682 of the function so that we can check it against other
4683 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4684 if (extern_ref && allocation_temporary_p ())
4685 end_temporary_allocation ();
4687 decl = build_decl (VAR_DECL, declarator, type);
4689 C_DECL_VARIABLE_SIZE (decl) = 1;
4692 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4694 DECL_EXTERNAL (decl) = extern_ref;
4695 /* At top level, the presence of a `static' or `register' storage
4696 class specifier, or the absence of all storage class specifiers
4697 makes this declaration a definition (perhaps tentative). Also,
4698 the absence of both `static' and `register' makes it public. */
4699 if (current_binding_level == global_binding_level)
4703 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4704 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4706 /* Not at top level, only `static' makes a static definition. */
4709 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4710 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4713 if (specbits & 1 << (int) RID_ITERATOR)
4714 ITERATOR_P (decl) = 1;
4717 /* Record `register' declaration for warnings on &
4718 and in case doing stupid register allocation. */
4720 if (specbits & (1 << (int) RID_REGISTER))
4721 DECL_REGISTER (decl) = 1;
4723 /* Record constancy and volatility. */
4726 TREE_READONLY (decl) = 1;
4729 TREE_SIDE_EFFECTS (decl) = 1;
4730 TREE_THIS_VOLATILE (decl) = 1;
4732 /* If a type has volatile components, it should be stored in memory.
4733 Otherwise, the fact that those components are volatile
4734 will be ignored, and would even crash the compiler. */
4735 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4736 mark_addressable (decl);
4744 /* Decode the parameter-list info for a function type or function definition.
4745 The argument is the value returned by `get_parm_info' (or made in parse.y
4746 if there is an identifier list instead of a parameter decl list).
4747 These two functions are separate because when a function returns
4748 or receives functions then each is called multiple times but the order
4749 of calls is different. The last call to `grokparms' is always the one
4750 that contains the formal parameter names of a function definition.
4752 Store in `last_function_parms' a chain of the decls of parms.
4753 Also store in `last_function_parm_tags' a chain of the struct, union,
4754 and enum tags declared among the parms.
4756 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4758 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4759 a mere declaration. A nonempty identifier-list gets an error message
4760 when FUNCDEF_FLAG is zero. */
4763 grokparms (parms_info, funcdef_flag)
4767 tree first_parm = TREE_CHAIN (parms_info);
4769 last_function_parms = TREE_PURPOSE (parms_info);
4770 last_function_parm_tags = TREE_VALUE (parms_info);
4772 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4773 && !in_system_header)
4774 warning ("function declaration isn't a prototype");
4777 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4780 pedwarn ("parameter names (without types) in function declaration");
4782 last_function_parms = first_parm;
4789 /* We no longer test FUNCDEF_FLAG.
4790 If the arg types are incomplete in a declaration,
4791 they must include undefined tags.
4792 These tags can never be defined in the scope of the declaration,
4793 so the types can never be completed,
4794 and no call can be compiled successfully. */
4796 /* In a fcn definition, arg types must be complete. */
4799 for (parm = last_function_parms, typelt = first_parm;
4801 parm = TREE_CHAIN (parm))
4802 /* Skip over any enumeration constants declared here. */
4803 if (TREE_CODE (parm) == PARM_DECL)
4805 /* Barf if the parameter itself has an incomplete type. */
4806 tree type = TREE_VALUE (typelt);
4807 if (TYPE_SIZE (type) == 0)
4809 if (funcdef_flag && DECL_NAME (parm) != 0)
4810 error ("parameter `%s' has incomplete type",
4811 IDENTIFIER_POINTER (DECL_NAME (parm)));
4813 warning ("parameter has incomplete type");
4816 TREE_VALUE (typelt) = error_mark_node;
4817 TREE_TYPE (parm) = error_mark_node;
4820 #if 0 /* This has been replaced by parm_tags_warning
4821 which uses a more accurate criterion for what to warn about. */
4824 /* Now warn if is a pointer to an incomplete type. */
4825 while (TREE_CODE (type) == POINTER_TYPE
4826 || TREE_CODE (type) == REFERENCE_TYPE)
4827 type = TREE_TYPE (type);
4828 type = TYPE_MAIN_VARIANT (type);
4829 if (TYPE_SIZE (type) == 0)
4831 if (DECL_NAME (parm) != 0)
4832 warning ("parameter `%s' points to incomplete type",
4833 IDENTIFIER_POINTER (DECL_NAME (parm)));
4835 warning ("parameter points to incomplete type");
4839 typelt = TREE_CHAIN (typelt);
4842 /* Allocate the list of types the way we allocate a type. */
4843 if (first_parm && ! TREE_PERMANENT (first_parm))
4845 /* Construct a copy of the list of types
4846 on the saveable obstack. */
4848 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4849 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4851 return nreverse (result);
4854 /* The list we have is permanent already. */
4860 /* Return a tree_list node with info on a parameter list just parsed.
4861 The TREE_PURPOSE is a chain of decls of those parms.
4862 The TREE_VALUE is a list of structure, union and enum tags defined.
4863 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4864 This tree_list node is later fed to `grokparms'.
4866 VOID_AT_END nonzero means append `void' to the end of the type-list.
4867 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4870 get_parm_info (void_at_end)
4873 register tree decl, t;
4874 register tree types = 0;
4876 tree tags = gettags ();
4877 tree parms = getdecls ();
4879 tree order = current_binding_level->parm_order;
4881 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4882 if (void_at_end && parms != 0
4883 && TREE_CHAIN (parms) == 0
4884 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4885 && DECL_NAME (parms) == 0)
4888 storedecls (NULL_TREE);
4889 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4890 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4893 /* Extract enumerator values and other non-parms declared with the parms.
4894 Likewise any forward parm decls that didn't have real parm decls. */
4895 for (decl = parms; decl; )
4897 tree next = TREE_CHAIN (decl);
4899 if (TREE_CODE (decl) != PARM_DECL)
4901 TREE_CHAIN (decl) = new_parms;
4904 else if (TREE_ASM_WRITTEN (decl))
4906 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4907 TREE_CHAIN (decl) = new_parms;
4913 /* Put the parm decls back in the order they were in in the parm list. */
4914 for (t = order; t; t = TREE_CHAIN (t))
4917 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4919 TREE_CHAIN (TREE_VALUE (t)) = 0;
4922 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4925 /* Store the parmlist in the binding level since the old one
4926 is no longer a valid list. (We have changed the chain pointers.) */
4927 storedecls (new_parms);
4929 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4930 /* There may also be declarations for enumerators if an enumeration
4931 type is declared among the parms. Ignore them here. */
4932 if (TREE_CODE (decl) == PARM_DECL)
4934 /* Since there is a prototype,
4935 args are passed in their declared types. */
4936 tree type = TREE_TYPE (decl);
4937 DECL_ARG_TYPE (decl) = type;
4938 #ifdef PROMOTE_PROTOTYPES
4939 if ((TREE_CODE (type) == INTEGER_TYPE
4940 || TREE_CODE (type) == ENUMERAL_TYPE)
4941 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4942 DECL_ARG_TYPE (decl) = integer_type_node;
4945 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4946 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4947 && DECL_NAME (decl) == 0)
4949 error ("`void' in parameter list must be the entire list");
4955 return saveable_tree_cons (new_parms, tags,
4956 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4958 return saveable_tree_cons (new_parms, tags, nreverse (types));
4961 /* At end of parameter list, warn about any struct, union or enum tags
4962 defined within. Do so because these types cannot ever become complete. */
4965 parmlist_tags_warning ()
4970 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4972 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4973 /* An anonymous union parm type is meaningful as a GNU extension.
4974 So don't warn for that. */
4975 if (code == UNION_TYPE && !pedantic)
4977 if (TREE_PURPOSE (elt) != 0)
4978 warning ("`%s %s' declared inside parameter list",
4979 (code == RECORD_TYPE ? "struct"
4980 : code == UNION_TYPE ? "union"
4982 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4984 warning ("anonymous %s declared inside parameter list",
4985 (code == RECORD_TYPE ? "struct"
4986 : code == UNION_TYPE ? "union"
4991 warning ("its scope is only this definition or declaration,");
4992 warning ("which is probably not what you want.");
4998 /* Get the struct, enum or union (CODE says which) with tag NAME.
4999 Define the tag as a forward-reference if it is not defined. */
5002 xref_tag (code, name)
5003 enum tree_code code;
5006 int temporary = allocation_temporary_p ();
5008 /* If a cross reference is requested, look up the type
5009 already defined for this tag and return it. */
5011 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5012 /* Even if this is the wrong type of tag, return what we found.
5013 There will be an error message anyway, from pending_xref_error.
5014 If we create an empty xref just for an invalid use of the type,
5015 the main result is to create lots of superfluous error messages. */
5019 push_obstacks_nochange ();
5021 if (current_binding_level == global_binding_level && temporary)
5022 end_temporary_allocation ();
5024 /* If no such tag is yet defined, create a forward-reference node
5025 and record it as the "definition".
5026 When a real declaration of this type is found,
5027 the forward-reference will be altered into a real type. */
5029 ref = make_node (code);
5030 if (code == ENUMERAL_TYPE)
5032 /* (In ANSI, Enums can be referred to only if already defined.) */
5034 pedwarn ("ANSI C forbids forward references to `enum' types");
5035 /* Give the type a default layout like unsigned int
5036 to avoid crashing if it does not get defined. */
5037 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5038 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5039 TREE_UNSIGNED (ref) = 1;
5040 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5041 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5042 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5045 pushtag (name, ref);
5052 /* Make sure that the tag NAME is defined *in the current binding level*
5053 at least as a forward reference.
5054 CODE says which kind of tag NAME ought to be.
5056 We also do a push_obstacks_nochange
5057 whose matching pop is in finish_struct. */
5060 start_struct (code, name)
5061 enum tree_code code;
5064 /* If there is already a tag defined at this binding level
5065 (as a forward reference), just return it. */
5067 register tree ref = 0;
5069 push_obstacks_nochange ();
5070 if (current_binding_level == global_binding_level)
5071 end_temporary_allocation ();
5074 ref = lookup_tag (code, name, current_binding_level, 1);
5075 if (ref && TREE_CODE (ref) == code)
5077 C_TYPE_BEING_DEFINED (ref) = 1;
5078 if (TYPE_FIELDS (ref))
5079 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5080 : "redefinition of `struct %s'"),
5081 IDENTIFIER_POINTER (name));
5086 /* Otherwise create a forward-reference just so the tag is in scope. */
5088 ref = make_node (code);
5089 pushtag (name, ref);
5090 C_TYPE_BEING_DEFINED (ref) = 1;
5094 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5095 of a structure component, returning a FIELD_DECL node.
5096 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5098 This is done during the parsing of the struct declaration.
5099 The FIELD_DECL nodes are chained together and the lot of them
5100 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5103 grokfield (filename, line, declarator, declspecs, width)
5106 tree declarator, declspecs, width;
5110 /* The corresponding pop_obstacks is in finish_decl. */
5111 push_obstacks_nochange ();
5113 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5115 finish_decl (value, NULL_TREE, NULL_TREE);
5116 DECL_INITIAL (value) = width;
5118 maybe_objc_check_decl (value);
5122 /* Function to help qsort sort FIELD_DECLs by name order. */
5125 field_decl_cmp (x, y)
5128 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
5131 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5132 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5134 We also do a pop_obstacks to match the push in start_struct. */
5137 finish_struct (t, fieldlist)
5138 register tree t, fieldlist;
5142 int toplevel = global_binding_level == current_binding_level;
5144 /* If this type was previously laid out as a forward reference,
5145 make sure we lay it out again. */
5149 /* Nameless union parm types are useful as GCC extension. */
5150 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5151 /* Otherwise, warn about any struct or union def. in parmlist. */
5152 if (in_parm_level_p ())
5155 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5156 : "structure defined inside parms"));
5157 else if (! flag_traditional)
5158 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5159 : "structure defined inside parms"));
5162 old_momentary = suspend_momentary ();
5164 if (fieldlist == 0 && pedantic)
5165 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5166 : "structure has no members"));
5168 /* Install struct as DECL_CONTEXT of each field decl.
5169 Also process specified field sizes.
5170 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5171 The specified size is found in the DECL_INITIAL.
5172 Store 0 there, except for ": 0" fields (so we can find them
5173 and delete them, below). */
5175 for (x = fieldlist; x; x = TREE_CHAIN (x))
5177 DECL_CONTEXT (x) = t;
5178 DECL_FIELD_SIZE (x) = 0;
5180 /* If any field is const, the structure type is pseudo-const. */
5181 if (TREE_READONLY (x))
5182 C_TYPE_FIELDS_READONLY (t) = 1;
5185 /* A field that is pseudo-const makes the structure likewise. */
5186 tree t1 = TREE_TYPE (x);
5187 while (TREE_CODE (t1) == ARRAY_TYPE)
5188 t1 = TREE_TYPE (t1);
5189 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5190 && C_TYPE_FIELDS_READONLY (t1))
5191 C_TYPE_FIELDS_READONLY (t) = 1;
5194 /* Any field that is volatile means variables of this type must be
5195 treated in some ways as volatile. */
5196 if (TREE_THIS_VOLATILE (x))
5197 C_TYPE_FIELDS_VOLATILE (t) = 1;
5199 /* Any field of nominal variable size implies structure is too. */
5200 if (C_DECL_VARIABLE_SIZE (x))
5201 C_TYPE_VARIABLE_SIZE (t) = 1;
5203 /* Detect invalid nested redefinition. */
5204 if (TREE_TYPE (x) == t)
5205 error ("nested redefinition of `%s'",
5206 IDENTIFIER_POINTER (TYPE_NAME (t)));
5208 /* Detect invalid bit-field size. */
5209 if (DECL_INITIAL (x))
5210 STRIP_NOPS (DECL_INITIAL (x));
5211 if (DECL_INITIAL (x))
5213 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5214 constant_expression_warning (DECL_INITIAL (x));
5217 error_with_decl (x, "bit-field `%s' width not an integer constant");
5218 DECL_INITIAL (x) = NULL;
5222 /* Detect invalid bit-field type. */
5223 if (DECL_INITIAL (x)
5224 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5225 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5227 error_with_decl (x, "bit-field `%s' has invalid type");
5228 DECL_INITIAL (x) = NULL;
5230 if (DECL_INITIAL (x) && pedantic
5231 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5232 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5233 /* Accept an enum that's equivalent to int or unsigned int. */
5234 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5235 && (TYPE_PRECISION (TREE_TYPE (x))
5236 == TYPE_PRECISION (integer_type_node))))
5237 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5239 /* Detect and ignore out of range field width. */
5240 if (DECL_INITIAL (x))
5242 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5244 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
5246 DECL_INITIAL (x) = NULL;
5247 error_with_decl (x, "negative width in bit-field `%s'");
5249 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5250 || width > TYPE_PRECISION (TREE_TYPE (x)))
5252 DECL_INITIAL (x) = NULL;
5253 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5255 else if (width == 0 && DECL_NAME (x) != 0)
5257 error_with_decl (x, "zero width for bit-field `%s'");
5258 DECL_INITIAL (x) = NULL;
5262 /* Process valid field width. */
5263 if (DECL_INITIAL (x))
5265 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5267 DECL_FIELD_SIZE (x) = width;
5268 DECL_BIT_FIELD (x) = 1;
5269 DECL_INITIAL (x) = NULL;
5273 /* field size 0 => force desired amount of alignment. */
5274 #ifdef EMPTY_FIELD_BOUNDARY
5275 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5277 #ifdef PCC_BITFIELD_TYPE_MATTERS
5278 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5279 TYPE_ALIGN (TREE_TYPE (x)));
5285 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5286 : TYPE_ALIGN (TREE_TYPE (x)));
5287 /* Non-bit-fields are aligned for their type, except packed
5288 fields which require only BITS_PER_UNIT alignment. */
5289 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5293 /* Now DECL_INITIAL is null on all members. */
5295 /* Delete all duplicate fields from the fieldlist */
5296 for (x = fieldlist; x && TREE_CHAIN (x);)
5297 /* Anonymous fields aren't duplicates. */
5298 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5302 register tree y = fieldlist;
5306 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5312 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5314 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5315 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5317 else x = TREE_CHAIN (x);
5320 /* Now we have the nearly final fieldlist. Record it,
5321 then lay out the structure or union (including the fields). */
5323 TYPE_FIELDS (t) = fieldlist;
5327 /* Delete all zero-width bit-fields from the front of the fieldlist */
5329 && DECL_INITIAL (fieldlist))
5330 fieldlist = TREE_CHAIN (fieldlist);
5331 /* Delete all such members from the rest of the fieldlist */
5332 for (x = fieldlist; x;)
5334 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5335 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5336 else x = TREE_CHAIN (x);
5339 /* Now we have the truly final field list.
5340 Store it in this type and in the variants. */
5342 TYPE_FIELDS (t) = fieldlist;
5344 /* If there are lots of fields, sort so we can look through them fast.
5345 We arbitrarily consider 16 or more elts to be "a lot". */
5349 for (x = fieldlist; x; x = TREE_CHAIN (x))
5360 len += list_length (x);
5361 /* Use the same allocation policy here that make_node uses, to
5362 ensure that this lives as long as the rest of the struct decl.
5363 All decls in an inline function need to be saved. */
5364 if (allocation_temporary_p ())
5365 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5367 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5369 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5370 TYPE_LANG_SPECIFIC (t)->len = len;
5372 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5374 for (x = fieldlist; x; x = TREE_CHAIN (x))
5375 field_array[len++] = x;
5377 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5381 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5383 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5384 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5385 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5388 /* Promote each bit-field's type to int if it is narrower than that. */
5389 for (x = fieldlist; x; x = TREE_CHAIN (x))
5390 if (DECL_BIT_FIELD (x)
5391 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
5392 || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
5394 tree type = TREE_TYPE (x);
5396 /* Preserve unsignedness if traditional
5397 or if not really getting any wider. */
5398 if (TREE_UNSIGNED (type)
5399 && (flag_traditional
5401 (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5403 DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
5404 TREE_TYPE (x) = unsigned_type_node;
5406 TREE_TYPE (x) = integer_type_node;
5409 /* If this structure or union completes the type of any previous
5410 variable declaration, lay it out and output its rtl. */
5412 if (current_binding_level->n_incomplete != 0)
5415 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5417 if (TREE_TYPE (decl) == t
5418 && TREE_CODE (decl) != TYPE_DECL)
5420 layout_decl (decl, 0);
5421 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5422 maybe_objc_check_decl (decl);
5423 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5426 --current_binding_level->n_incomplete;
5428 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5429 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5431 tree element = TREE_TYPE (decl);
5432 while (TREE_CODE (element) == ARRAY_TYPE)
5433 element = TREE_TYPE (element);
5435 layout_array_type (TREE_TYPE (decl));
5440 resume_momentary (old_momentary);
5442 /* Finish debugging output for this type. */
5443 rest_of_type_compilation (t, toplevel);
5445 /* The matching push is in start_struct. */
5451 /* Lay out the type T, and its element type, and so on. */
5454 layout_array_type (t)
5457 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5458 layout_array_type (TREE_TYPE (t));
5462 /* Begin compiling the definition of an enumeration type.
5463 NAME is its name (or null if anonymous).
5464 Returns the type object, as yet incomplete.
5465 Also records info about it so that build_enumerator
5466 may be used to declare the individual values as they are read. */
5472 register tree enumtype = 0;
5474 /* If this is the real definition for a previous forward reference,
5475 fill in the contents in the same object that used to be the
5476 forward reference. */
5479 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5481 /* The corresponding pop_obstacks is in finish_enum. */
5482 push_obstacks_nochange ();
5483 /* If these symbols and types are global, make them permanent. */
5484 if (current_binding_level == global_binding_level)
5485 end_temporary_allocation ();
5487 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5489 enumtype = make_node (ENUMERAL_TYPE);
5490 pushtag (name, enumtype);
5493 C_TYPE_BEING_DEFINED (enumtype) = 1;
5495 if (TYPE_VALUES (enumtype) != 0)
5497 /* This enum is a named one that has been declared already. */
5498 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5500 /* Completely replace its old definition.
5501 The old enumerators remain defined, however. */
5502 TYPE_VALUES (enumtype) = 0;
5505 enum_next_value = integer_zero_node;
5511 /* After processing and defining all the values of an enumeration type,
5512 install their decls in the enumeration type and finish it off.
5513 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5514 Returns ENUMTYPE. */
5517 finish_enum (enumtype, values)
5518 register tree enumtype, values;
5520 register tree pair, tem;
5521 tree minnode = 0, maxnode = 0;
5522 register HOST_WIDE_INT maxvalue = 0;
5523 register HOST_WIDE_INT minvalue = 0;
5525 unsigned precision = 0;
5526 int toplevel = global_binding_level == current_binding_level;
5527 int temporary = allocation_temporary_p ();
5529 if (in_parm_level_p ())
5530 warning ("enum defined inside parms");
5532 /* Calculate the maximum value of any enumerator in this type. */
5534 for (pair = values; pair; pair = TREE_CHAIN (pair))
5536 tree value = TREE_VALUE (pair);
5538 minnode = maxnode = TREE_VALUE (pair);
5541 if (tree_int_cst_lt (maxnode, value))
5543 if (tree_int_cst_lt (value, minnode))
5548 TYPE_MIN_VALUE (enumtype) = minnode;
5549 TYPE_MAX_VALUE (enumtype) = maxnode;
5551 /* Determine the precision this type needs. */
5553 if (TREE_INT_CST_HIGH (minnode) >= 0
5554 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5555 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5556 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5557 precision = TYPE_PRECISION (long_long_integer_type_node);
5560 maxvalue = TREE_INT_CST_LOW (maxnode);
5561 minvalue = TREE_INT_CST_LOW (minnode);
5564 precision = floor_log2 (maxvalue) + 1;
5567 /* Compute number of bits to represent magnitude of a negative value.
5568 Add one to MINVALUE since range of negative numbers
5569 includes the power of two. */
5570 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5571 if (negprecision > precision)
5572 precision = negprecision;
5573 precision += 1; /* room for sign bit */
5580 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5581 /* Use the width of the narrowest normal C type which is wide enough. */
5582 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5584 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5586 TYPE_SIZE (enumtype) = 0;
5587 layout_type (enumtype);
5589 /* An enum can have some negative values; then it is signed. */
5590 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5592 /* Change the type of the enumerators to be the enum type.
5593 Formerly this was done only for enums that fit in an int,
5594 but the comment said it was done only for enums wider than int.
5595 It seems necessary to do this for wide enums,
5596 and best not to change what's done for ordinary narrower ones. */
5597 for (pair = values; pair; pair = TREE_CHAIN (pair))
5599 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5600 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5601 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5602 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5605 /* Replace the decl nodes in VALUES with their names. */
5606 for (pair = values; pair; pair = TREE_CHAIN (pair))
5607 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5609 TYPE_VALUES (enumtype) = values;
5611 /* Fix up all variant types of this enum type. */
5612 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5614 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5615 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5616 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5617 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5618 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5619 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5620 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5621 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5624 /* Finish debugging output for this type. */
5625 rest_of_type_compilation (enumtype, toplevel);
5627 /* This matches a push in start_enum. */
5633 /* Build and install a CONST_DECL for one value of the
5634 current enumeration type (one that was begun with start_enum).
5635 Return a tree-list containing the CONST_DECL and its value.
5636 Assignment of sequential values by default is handled here. */
5639 build_enumerator (name, value)
5642 register tree decl, type;
5644 /* Validate and default VALUE. */
5646 /* Remove no-op casts from the value. */
5648 STRIP_TYPE_NOPS (value);
5652 if (TREE_CODE (value) == INTEGER_CST)
5654 value = default_conversion (value);
5655 constant_expression_warning (value);
5659 error ("enumerator value for `%s' not integer constant",
5660 IDENTIFIER_POINTER (name));
5665 /* Default based on previous value. */
5666 /* It should no longer be possible to have NON_LVALUE_EXPR
5670 value = enum_next_value;
5672 error ("overflow in enumeration values");
5675 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5677 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5678 value = integer_zero_node;
5681 /* Set basis for default for next value. */
5682 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5683 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5685 /* Now create a declaration for the enum value name. */
5687 type = TREE_TYPE (value);
5688 type = type_for_size (MAX (TYPE_PRECISION (type),
5689 TYPE_PRECISION (integer_type_node)),
5691 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5692 && TREE_UNSIGNED (type)));
5694 decl = build_decl (CONST_DECL, name, type);
5695 DECL_INITIAL (decl) = value;
5696 TREE_TYPE (value) = type;
5699 return saveable_tree_cons (decl, value, NULL_TREE);
5702 /* Create the FUNCTION_DECL for a function definition.
5703 DECLSPECS and DECLARATOR are the parts of the declaration;
5704 they describe the function's name and the type it returns,
5705 but twisted together in a fashion that parallels the syntax of C.
5707 This function creates a binding context for the function body
5708 as well as setting up the FUNCTION_DECL in current_function_decl.
5710 Returns 1 on success. If the DECLARATOR is not suitable for a function
5711 (it defines a datum instead), we return 0, which tells
5712 yyparse to report a parse error.
5714 NESTED is nonzero for a function nested within another function. */
5717 start_function (declspecs, declarator, nested)
5718 tree declarator, declspecs;
5721 tree decl1, old_decl;
5724 current_function_returns_value = 0; /* Assume, until we see it does. */
5725 current_function_returns_null = 0;
5726 warn_about_return_type = 0;
5727 current_extern_inline = 0;
5728 c_function_varargs = 0;
5730 shadowed_labels = 0;
5732 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5734 /* If the declarator is not suitable for a function definition,
5735 cause a syntax error. */
5739 announce_function (decl1);
5741 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5743 error ("return-type is an incomplete type");
5744 /* Make it return void instead. */
5746 = build_function_type (void_type_node,
5747 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5750 if (warn_about_return_type)
5751 warning ("return-type defaults to `int'");
5753 /* Save the parm names or decls from this function's declarator
5754 where store_parm_decls will find them. */
5755 current_function_parms = last_function_parms;
5756 current_function_parm_tags = last_function_parm_tags;
5758 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5759 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5760 DECL_INITIAL (decl1) = error_mark_node;
5762 /* If this definition isn't a prototype and we had a prototype declaration
5763 before, copy the arg type info from that prototype.
5764 But not if what we had before was a builtin function. */
5765 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5766 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5767 && !DECL_BUILT_IN (old_decl)
5768 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5769 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5770 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5772 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5773 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5774 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5777 /* Optionally warn of old-fashioned def with no previous prototype. */
5778 if (warn_strict_prototypes
5779 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5780 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5781 warning ("function declaration isn't a prototype");
5782 /* Optionally warn of any global def with no previous prototype. */
5783 else if (warn_missing_prototypes
5784 && TREE_PUBLIC (decl1)
5785 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5786 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5787 warning_with_decl (decl1, "no previous prototype for `%s'");
5788 /* Optionally warn of any def with no previous prototype
5789 if the function has already been used. */
5790 else if (warn_missing_prototypes
5791 && old_decl != 0 && TREE_USED (old_decl)
5792 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5793 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5795 /* This is a definition, not a reference.
5796 So normally clear DECL_EXTERNAL.
5797 However, `extern inline' acts like a declaration
5798 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5799 DECL_EXTERNAL (decl1) = current_extern_inline;
5801 /* This function exists in static storage.
5802 (This does not mean `static' in the C sense!) */
5803 TREE_STATIC (decl1) = 1;
5805 /* A nested function is not global. */
5806 if (current_function_decl != 0)
5807 TREE_PUBLIC (decl1) = 0;
5809 /* Record the decl so that the function name is defined.
5810 If we already have a decl for this name, and it is a FUNCTION_DECL,
5811 use the old decl. */
5813 current_function_decl = pushdecl (decl1);
5816 declare_parm_level (1);
5817 current_binding_level->subblocks_tag_transparent = 1;
5819 make_function_rtl (current_function_decl);
5821 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5822 /* Promote the value to int before returning it. */
5823 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5825 /* It retains unsignedness if traditional
5826 or if not really getting wider. */
5827 if (TREE_UNSIGNED (restype)
5828 && (flag_traditional
5829 || (TYPE_PRECISION (restype)
5830 == TYPE_PRECISION (integer_type_node))))
5831 restype = unsigned_type_node;
5833 restype = integer_type_node;
5835 DECL_RESULT (current_function_decl)
5836 = build_decl (RESULT_DECL, NULL_TREE, restype);
5839 /* Allocate further tree nodes temporarily during compilation
5840 of this function only. */
5841 temporary_allocation ();
5843 /* If this fcn was already referenced via a block-scope `extern' decl
5844 (or an implicit decl), propagate certain information about the usage. */
5845 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5846 TREE_ADDRESSABLE (current_function_decl) = 1;
5851 /* Record that this function is going to be a varargs function.
5852 This is called before store_parm_decls, which is too early
5853 to call mark_varargs directly. */
5858 c_function_varargs = 1;
5861 /* Store the parameter declarations into the current function declaration.
5862 This is called after parsing the parameter declarations, before
5863 digesting the body of the function.
5865 For an old-style definition, modify the function's type
5866 to specify at least the number of arguments. */
5871 register tree fndecl = current_function_decl;
5874 /* This is either a chain of PARM_DECLs (if a prototype was used)
5875 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5876 tree specparms = current_function_parms;
5878 /* This is a list of types declared among parms in a prototype. */
5879 tree parmtags = current_function_parm_tags;
5881 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5882 register tree parmdecls = getdecls ();
5884 /* This is a chain of any other decls that came in among the parm
5885 declarations. If a parm is declared with enum {foo, bar} x;
5886 then CONST_DECLs for foo and bar are put here. */
5889 /* Nonzero if this definition is written with a prototype. */
5892 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5894 /* This case is when the function was defined with an ANSI prototype.
5895 The parms already have decls, so we need not do anything here
5896 except record them as in effect
5897 and complain if any redundant old-style parm decls were written. */
5908 error_with_decl (fndecl,
5909 "parm types given both in parmlist and separately");
5910 /* Get rid of the erroneous decls; don't keep them on
5911 the list of parms, since they might not be PARM_DECLs. */
5912 for (decl = current_binding_level->names;
5913 decl; decl = TREE_CHAIN (decl))
5914 if (DECL_NAME (decl))
5915 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5916 for (link = current_binding_level->shadowed;
5917 link; link = TREE_CHAIN (link))
5918 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5919 current_binding_level->names = 0;
5920 current_binding_level->shadowed = 0;
5923 specparms = nreverse (specparms);
5924 for (parm = specparms; parm; parm = next)
5926 next = TREE_CHAIN (parm);
5927 if (TREE_CODE (parm) == PARM_DECL)
5929 if (DECL_NAME (parm) == 0)
5930 error_with_decl (parm, "parameter name omitted");
5931 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5933 error_with_decl (parm, "parameter `%s' declared void");
5934 /* Change the type to error_mark_node so this parameter
5935 will be ignored by assign_parms. */
5936 TREE_TYPE (parm) = error_mark_node;
5942 /* If we find an enum constant or a type tag,
5943 put it aside for the moment. */
5944 TREE_CHAIN (parm) = 0;
5945 others = chainon (others, parm);
5949 /* Get the decls in their original chain order
5950 and record in the function. */
5951 DECL_ARGUMENTS (fndecl) = getdecls ();
5954 /* If this function takes a variable number of arguments,
5955 add a phony parameter to the end of the parm list,
5956 to represent the position of the first unnamed argument. */
5957 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5960 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5961 /* Let's hope the address of the unnamed parm
5962 won't depend on its type. */
5963 TREE_TYPE (dummy) = integer_type_node;
5964 DECL_ARG_TYPE (dummy) = integer_type_node;
5965 DECL_ARGUMENTS (fndecl)
5966 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5970 /* Now pushdecl the enum constants. */
5971 for (parm = others; parm; parm = next)
5973 next = TREE_CHAIN (parm);
5974 if (DECL_NAME (parm) == 0)
5976 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5978 else if (TREE_CODE (parm) != PARM_DECL)
5982 storetags (chainon (parmtags, gettags ()));
5986 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5987 each with a parm name as the TREE_VALUE.
5989 PARMDECLS is a chain of declarations for parameters.
5990 Warning! It can also contain CONST_DECLs which are not parameters
5991 but are names of enumerators of any enum types
5992 declared among the parameters.
5994 First match each formal parameter name with its declaration.
5995 Associate decls with the names and store the decls
5996 into the TREE_PURPOSE slots. */
5998 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5999 DECL_RESULT (parm) = 0;
6001 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6003 register tree tail, found = NULL;
6005 if (TREE_VALUE (parm) == 0)
6007 error_with_decl (fndecl, "parameter name missing from parameter list");
6008 TREE_PURPOSE (parm) = 0;
6012 /* See if any of the parmdecls specifies this parm by name.
6013 Ignore any enumerator decls. */
6014 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6015 if (DECL_NAME (tail) == TREE_VALUE (parm)
6016 && TREE_CODE (tail) == PARM_DECL)
6022 /* If declaration already marked, we have a duplicate name.
6023 Complain, and don't use this decl twice. */
6024 if (found && DECL_RESULT (found) != 0)
6026 error_with_decl (found, "multiple parameters named `%s'");
6030 /* If the declaration says "void", complain and ignore it. */
6031 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6033 error_with_decl (found, "parameter `%s' declared void");
6034 TREE_TYPE (found) = integer_type_node;
6035 DECL_ARG_TYPE (found) = integer_type_node;
6036 layout_decl (found, 0);
6039 /* Traditionally, a parm declared float is actually a double. */
6040 if (found && flag_traditional
6041 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6043 TREE_TYPE (found) = double_type_node;
6044 DECL_ARG_TYPE (found) = double_type_node;
6045 layout_decl (found, 0);
6048 /* If no declaration found, default to int. */
6051 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6053 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6054 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6055 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6057 warning_with_decl (found, "type of `%s' defaults to `int'");
6061 TREE_PURPOSE (parm) = found;
6063 /* Mark this decl as "already found" -- see test, above.
6064 It is safe to use DECL_RESULT for this
6065 since it is not used in PARM_DECLs or CONST_DECLs. */
6066 DECL_RESULT (found) = error_mark_node;
6069 /* Put anything which is on the parmdecls chain and which is
6070 not a PARM_DECL onto the list NONPARMS. (The types of
6071 non-parm things which might appear on the list include
6072 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6073 any actual PARM_DECLs not matched with any names. */
6076 for (parm = parmdecls; parm; )
6078 tree next = TREE_CHAIN (parm);
6079 TREE_CHAIN (parm) = 0;
6081 if (TREE_CODE (parm) != PARM_DECL)
6082 nonparms = chainon (nonparms, parm);
6085 /* Complain about args with incomplete types. */
6086 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6088 error_with_decl (parm, "parameter `%s' has incomplete type");
6089 TREE_TYPE (parm) = error_mark_node;
6092 if (DECL_RESULT (parm) == 0)
6094 error_with_decl (parm,
6095 "declaration for parameter `%s' but no such parameter");
6096 /* Pretend the parameter was not missing.
6097 This gets us to a standard state and minimizes
6098 further error messages. */
6100 = chainon (specparms,
6101 tree_cons (parm, NULL_TREE, NULL_TREE));
6108 /* Chain the declarations together in the order of the list of names. */
6109 /* Store that chain in the function decl, replacing the list of names. */
6111 DECL_ARGUMENTS (fndecl) = 0;
6114 for (last = 0; parm; parm = TREE_CHAIN (parm))
6115 if (TREE_PURPOSE (parm))
6118 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6120 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6121 last = TREE_PURPOSE (parm);
6122 TREE_CHAIN (last) = 0;
6126 /* If there was a previous prototype,
6127 set the DECL_ARG_TYPE of each argument according to
6128 the type previously specified, and report any mismatches. */
6130 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6133 for (parm = DECL_ARGUMENTS (fndecl),
6134 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6135 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6136 != void_type_node));
6137 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6139 if (parm == 0 || type == 0
6140 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6142 error ("number of arguments doesn't match prototype");
6143 error_with_file_and_line (current_function_prototype_file,
6144 current_function_prototype_line,
6145 "prototype declaration");
6148 /* Type for passing arg must be consistent
6149 with that declared for the arg. */
6150 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6152 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6153 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6155 /* Adjust argument to match prototype. E.g. a previous
6156 `int foo(float);' prototype causes
6157 `int foo(x) float x; {...}' to be treated like
6158 `int foo(float x) {...}'. This is particularly
6159 useful for argument types like uid_t. */
6160 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6161 #ifdef PROMOTE_PROTOTYPES
6162 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6163 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6164 && TYPE_PRECISION (TREE_TYPE (parm))
6165 < TYPE_PRECISION (integer_type_node))
6166 DECL_ARG_TYPE (parm) = integer_type_node;
6170 pedwarn ("promoted argument `%s' doesn't match prototype",
6171 IDENTIFIER_POINTER (DECL_NAME (parm)));
6172 warning_with_file_and_line
6173 (current_function_prototype_file,
6174 current_function_prototype_line,
6175 "prototype declaration");
6178 /* If -traditional, allow `int' argument to match
6179 `unsigned' prototype. */
6180 else if (! (flag_traditional
6181 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6182 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6184 error ("argument `%s' doesn't match prototype",
6185 IDENTIFIER_POINTER (DECL_NAME (parm)));
6186 error_with_file_and_line (current_function_prototype_file,
6187 current_function_prototype_line,
6188 "prototype declaration");
6192 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6195 /* Otherwise, create a prototype that would match. */
6199 register tree actual, type;
6200 register tree last = 0;
6202 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6204 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6207 TREE_CHAIN (last) = type;
6212 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6214 TREE_CHAIN (last) = type;
6218 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6219 of the type of this function, but we need to avoid having this
6220 affect the types of other similarly-typed functions, so we must
6221 first force the generation of an identical (but separate) type
6222 node for the relevant function type. The new node we create
6223 will be a variant of the main variant of the original function
6226 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6228 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6231 /* Now store the final chain of decls for the arguments
6232 as the decl-chain of the current lexical scope.
6233 Put the enumerators in as well, at the front so that
6234 DECL_ARGUMENTS is not modified. */
6236 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6239 /* Make sure the binding level for the top of the function body
6240 gets a BLOCK if there are any in the function.
6241 Otherwise, the dbx output is wrong. */
6243 keep_next_if_subblocks = 1;
6245 /* ??? This might be an improvement,
6246 but needs to be thought about some more. */
6248 keep_next_level_flag = 1;
6251 /* Write a record describing this function definition to the prototypes
6252 file (if requested). */
6254 gen_aux_info_record (fndecl, 1, 0, prototype);
6256 /* Initialize the RTL code for the function. */
6258 init_function_start (fndecl, input_filename, lineno);
6260 /* If this is a varargs function, inform function.c. */
6262 if (c_function_varargs)
6265 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6267 declare_function_name ();
6269 /* Set up parameters and prepare for return, for the function. */
6271 expand_function_start (fndecl, 0);
6273 /* If this function is `main', emit a call to `__main'
6274 to run global initializers, etc. */
6275 if (DECL_NAME (fndecl)
6276 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6277 && DECL_CONTEXT (fndecl) == NULL_TREE)
6278 expand_main_function ();
6281 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6282 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6283 stands for an ellipsis in the identifier list.
6285 PARMLIST is the data returned by get_parm_info for the
6286 parmlist that follows the semicolon.
6288 We return a value of the same sort that get_parm_info returns,
6289 except that it describes the combination of identifiers and parmlist. */
6292 combine_parm_decls (specparms, parmlist, void_at_end)
6293 tree specparms, parmlist;
6296 register tree fndecl = current_function_decl;
6299 tree parmdecls = TREE_PURPOSE (parmlist);
6301 /* This is a chain of any other decls that came in among the parm
6302 declarations. They were separated already by get_parm_info,
6303 so we just need to keep them separate. */
6304 tree nonparms = TREE_VALUE (parmlist);
6308 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6309 DECL_RESULT (parm) = 0;
6311 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6313 register tree tail, found = NULL;
6315 /* See if any of the parmdecls specifies this parm by name. */
6316 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6317 if (DECL_NAME (tail) == TREE_VALUE (parm))
6323 /* If declaration already marked, we have a duplicate name.
6324 Complain, and don't use this decl twice. */
6325 if (found && DECL_RESULT (found) != 0)
6327 error_with_decl (found, "multiple parameters named `%s'");
6331 /* If the declaration says "void", complain and ignore it. */
6332 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6334 error_with_decl (found, "parameter `%s' declared void");
6335 TREE_TYPE (found) = integer_type_node;
6336 DECL_ARG_TYPE (found) = integer_type_node;
6337 layout_decl (found, 0);
6340 /* Traditionally, a parm declared float is actually a double. */
6341 if (found && flag_traditional
6342 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6344 TREE_TYPE (found) = double_type_node;
6345 DECL_ARG_TYPE (found) = double_type_node;
6346 layout_decl (found, 0);
6349 /* If no declaration found, default to int. */
6352 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6354 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6355 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6356 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6357 error_with_decl (found, "type of parameter `%s' is not declared");
6361 TREE_PURPOSE (parm) = found;
6363 /* Mark this decl as "already found" -- see test, above.
6364 It is safe to use DECL_RESULT for this
6365 since it is not used in PARM_DECLs or CONST_DECLs. */
6366 DECL_RESULT (found) = error_mark_node;
6369 /* Complain about any actual PARM_DECLs not matched with any names. */
6371 for (parm = parmdecls; parm; )
6373 tree next = TREE_CHAIN (parm);
6374 TREE_CHAIN (parm) = 0;
6376 /* Complain about args with incomplete types. */
6377 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6379 error_with_decl (parm, "parameter `%s' has incomplete type");
6380 TREE_TYPE (parm) = error_mark_node;
6383 if (DECL_RESULT (parm) == 0)
6385 error_with_decl (parm,
6386 "declaration for parameter `%s' but no such parameter");
6387 /* Pretend the parameter was not missing.
6388 This gets us to a standard state and minimizes
6389 further error messages. */
6391 = chainon (specparms,
6392 tree_cons (parm, NULL_TREE, NULL_TREE));
6398 /* Chain the declarations together in the order of the list of names.
6399 At the same time, build up a list of their types, in reverse order. */
6405 for (last = 0; parm; parm = TREE_CHAIN (parm))
6406 if (TREE_PURPOSE (parm))
6409 parmdecls = TREE_PURPOSE (parm);
6411 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6412 last = TREE_PURPOSE (parm);
6413 TREE_CHAIN (last) = 0;
6415 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6420 return saveable_tree_cons (parmdecls, nonparms,
6421 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6423 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6426 /* Finish up a function declaration and compile that function
6427 all the way to assembler language output. The free the storage
6428 for the function definition.
6430 This is called after parsing the body of the function definition.
6432 NESTED is nonzero if the function being finished is nested in another. */
6435 finish_function (nested)
6438 register tree fndecl = current_function_decl;
6440 /* TREE_READONLY (fndecl) = 1;
6441 This caused &foo to be of type ptr-to-const-function
6442 which then got a warning when stored in a ptr-to-function variable. */
6445 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6447 /* Must mark the RESULT_DECL as being in this function. */
6449 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6451 /* Obey `register' declarations if `setjmp' is called in this fn. */
6452 if (flag_traditional && current_function_calls_setjmp)
6454 setjmp_protect (DECL_INITIAL (fndecl));
6455 setjmp_protect_args ();
6458 #ifdef DEFAULT_MAIN_RETURN
6459 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6461 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6462 != integer_type_node)
6463 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6466 /* Make it so that `main' always returns success by default. */
6467 DEFAULT_MAIN_RETURN;
6472 /* Generate rtl for function exit. */
6473 expand_function_end (input_filename, lineno, 0);
6475 /* So we can tell if jump_optimize sets it to 1. */
6478 /* Run the optimizers and output the assembler code for this function. */
6479 rest_of_compilation (fndecl);
6481 current_function_returns_null |= can_reach_end;
6483 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6484 warning ("`volatile' function does return");
6485 else if (warn_return_type && can_reach_end
6486 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6487 /* If this function returns non-void and control can drop through,
6489 warning ("control reaches end of non-void function");
6490 /* With just -W, complain only if function returns both with
6491 and without a value. */
6492 else if (extra_warnings
6493 && current_function_returns_value && current_function_returns_null)
6494 warning ("this function may return with or without a value");
6496 /* Free all the tree nodes making up this function. */
6497 /* Switch back to allocating nodes permanently
6498 until we start another function. */
6500 permanent_allocation ();
6502 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6504 /* Stop pointing to the local nodes about to be freed. */
6505 /* But DECL_INITIAL must remain nonzero so we know this
6506 was an actual function definition. */
6507 /* For a nested function, this is done in pop_c_function_context. */
6508 /* If rest_of_compilation set this to 0, leave it 0. */
6509 if (DECL_INITIAL (fndecl) != 0)
6510 DECL_INITIAL (fndecl) = error_mark_node;
6511 DECL_ARGUMENTS (fndecl) = 0;
6516 /* Let the error reporting routines know that we're outside a
6517 function. For a nested function, this value is used in
6518 pop_c_function_context and then reset via pop_function_context. */
6519 current_function_decl = NULL;
6523 /* Save and restore the variables in this file and elsewhere
6524 that keep track of the progress of compilation of the current function.
6525 Used for nested functions. */
6529 struct c_function *next;
6531 tree shadowed_labels;
6534 int warn_about_return_type;
6536 struct binding_level *binding_level;
6539 struct c_function *c_function_chain;
6541 /* Save and reinitialize the variables
6542 used during compilation of a C function. */
6545 push_c_function_context ()
6547 struct c_function *p
6548 = (struct c_function *) xmalloc (sizeof (struct c_function));
6551 pedwarn ("ANSI C forbids nested functions");
6553 push_function_context ();
6555 p->next = c_function_chain;
6556 c_function_chain = p;
6558 p->named_labels = named_labels;
6559 p->shadowed_labels = shadowed_labels;
6560 p->returns_value = current_function_returns_value;
6561 p->returns_null = current_function_returns_null;
6562 p->warn_about_return_type = warn_about_return_type;
6563 p->extern_inline = current_extern_inline;
6564 p->binding_level = current_binding_level;
6567 /* Restore the variables used during compilation of a C function. */
6570 pop_c_function_context ()
6572 struct c_function *p = c_function_chain;
6575 /* Bring back all the labels that were shadowed. */
6576 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6577 if (DECL_NAME (TREE_VALUE (link)) != 0)
6578 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6579 = TREE_VALUE (link);
6581 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6583 /* Stop pointing to the local nodes about to be freed. */
6584 /* But DECL_INITIAL must remain nonzero so we know this
6585 was an actual function definition. */
6586 DECL_INITIAL (current_function_decl) = error_mark_node;
6587 DECL_ARGUMENTS (current_function_decl) = 0;
6590 pop_function_context ();
6592 c_function_chain = p->next;
6594 named_labels = p->named_labels;
6595 shadowed_labels = p->shadowed_labels;
6596 current_function_returns_value = p->returns_value;
6597 current_function_returns_null = p->returns_null;
6598 warn_about_return_type = p->warn_about_return_type;
6599 current_extern_inline = p->extern_inline;
6600 current_binding_level = p->binding_level;