1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-97, 1998 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, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
40 extern cpp_reader parse_in;
41 extern cpp_options parse_options;
42 static int cpp_initialized;
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
54 #ifndef CHAR_TYPE_SIZE
55 #define CHAR_TYPE_SIZE BITS_PER_UNIT
58 #ifndef SHORT_TYPE_SIZE
59 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
63 #define INT_TYPE_SIZE BITS_PER_WORD
66 #ifndef LONG_TYPE_SIZE
67 #define LONG_TYPE_SIZE BITS_PER_WORD
70 #ifndef LONG_LONG_TYPE_SIZE
71 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
74 #ifndef WCHAR_UNSIGNED
75 #define WCHAR_UNSIGNED 0
78 #ifndef FLOAT_TYPE_SIZE
79 #define FLOAT_TYPE_SIZE BITS_PER_WORD
82 #ifndef DOUBLE_TYPE_SIZE
83 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
86 #ifndef LONG_DOUBLE_TYPE_SIZE
87 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
90 /* We let tm.h override the types used here, to handle trivial differences
91 such as the choice of unsigned int or long unsigned int for size_t.
92 When machines start needing nontrivial differences in the size type,
93 it would be best to do something here to figure out automatically
94 from other information what type to use. */
97 #define SIZE_TYPE "long unsigned int"
101 #define PTRDIFF_TYPE "long int"
105 #define WCHAR_TYPE "int"
108 /* a node which has tree code ERROR_MARK, and whose type is itself.
109 All erroneous expressions are replaced with this node. All functions
110 that accept nodes as arguments should avoid generating error messages
111 if this node is one of the arguments, since it is undesirable to get
112 multiple error messages from one error in the input. */
114 tree error_mark_node;
116 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
118 tree short_integer_type_node;
119 tree integer_type_node;
120 tree long_integer_type_node;
121 tree long_long_integer_type_node;
123 tree short_unsigned_type_node;
124 tree unsigned_type_node;
125 tree long_unsigned_type_node;
126 tree long_long_unsigned_type_node;
128 tree boolean_type_node;
129 tree boolean_false_node;
130 tree boolean_true_node;
132 tree ptrdiff_type_node;
134 tree unsigned_char_type_node;
135 tree signed_char_type_node;
137 tree wchar_type_node;
138 tree signed_wchar_type_node;
139 tree unsigned_wchar_type_node;
141 tree float_type_node;
142 tree double_type_node;
143 tree long_double_type_node;
145 tree complex_integer_type_node;
146 tree complex_float_type_node;
147 tree complex_double_type_node;
148 tree complex_long_double_type_node;
150 tree intQI_type_node;
151 tree intHI_type_node;
152 tree intSI_type_node;
153 tree intDI_type_node;
154 #if HOST_BITS_PER_WIDE_INT >= 64
155 tree intTI_type_node;
158 tree unsigned_intQI_type_node;
159 tree unsigned_intHI_type_node;
160 tree unsigned_intSI_type_node;
161 tree unsigned_intDI_type_node;
162 #if HOST_BITS_PER_WIDE_INT >= 64
163 tree unsigned_intTI_type_node;
166 /* a VOID_TYPE node. */
170 /* Nodes for types `void *' and `const void *'. */
172 tree ptr_type_node, const_ptr_type_node;
174 /* Nodes for types `char *' and `const char *'. */
176 tree string_type_node, const_string_type_node;
178 /* Type `char[SOMENUMBER]'.
179 Used when an array of char is needed and the size is irrelevant. */
181 tree char_array_type_node;
183 /* Type `int[SOMENUMBER]' or something like it.
184 Used when an array of int needed and the size is irrelevant. */
186 tree int_array_type_node;
188 /* Type `wchar_t[SOMENUMBER]' or something like it.
189 Used when a wide string literal is created. */
191 tree wchar_array_type_node;
193 /* type `int ()' -- used for implicit declaration of functions. */
195 tree default_function_type;
197 /* function types `double (double)' and `double (double, double)', etc. */
199 tree double_ftype_double, double_ftype_double_double;
200 tree int_ftype_int, long_ftype_long;
201 tree float_ftype_float;
202 tree ldouble_ftype_ldouble;
204 /* Function type `void (void *, void *, int)' and similar ones */
206 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
208 /* Function type `char *(char *, char *)' and similar ones */
209 tree string_ftype_ptr_ptr, int_ftype_string_string;
211 /* Function type `int (const void *, const void *, size_t)' */
212 tree int_ftype_cptr_cptr_sizet;
214 /* Two expressions that are constants with value zero.
215 The first is of type `int', the second of type `void *'. */
217 tree integer_zero_node;
218 tree null_pointer_node;
220 /* A node for the integer constant 1. */
222 tree integer_one_node;
224 /* Nonzero if we have seen an invalid cross reference
225 to a struct, union, or enum, but not yet printed the message. */
227 tree pending_invalid_xref;
228 /* File and line to appear in the eventual error message. */
229 char *pending_invalid_xref_file;
230 int pending_invalid_xref_line;
232 /* While defining an enum type, this is 1 plus the last enumerator
233 constant value. Note that will do not have to save this or `enum_overflow'
234 around nested function definition since such a definition could only
235 occur in an enum value expression and we don't use these variables in
238 static tree enum_next_value;
240 /* Nonzero means that there was overflow computing enum_next_value. */
242 static int enum_overflow;
244 /* Parsing a function declarator leaves a list of parameter names
245 or a chain or parameter decls here. */
247 static tree last_function_parms;
249 /* Parsing a function declarator leaves here a chain of structure
250 and enum types declared in the parmlist. */
252 static tree last_function_parm_tags;
254 /* After parsing the declarator that starts a function definition,
255 `start_function' puts here the list of parameter names or chain of decls.
256 `store_parm_decls' finds it here. */
258 static tree current_function_parms;
260 /* Similar, for last_function_parm_tags. */
261 static tree current_function_parm_tags;
263 /* Similar, for the file and line that the prototype came from if this is
264 an old-style definition. */
265 static char *current_function_prototype_file;
266 static int current_function_prototype_line;
268 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
269 that have names. Here so we can clear out their names' definitions
270 at the end of the function. */
272 static tree named_labels;
274 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
276 static tree shadowed_labels;
278 /* Nonzero when store_parm_decls is called indicates a varargs function.
279 Value not meaningful after store_parm_decls. */
281 static int c_function_varargs;
283 /* The FUNCTION_DECL for the function currently being compiled,
284 or 0 if between functions. */
285 tree current_function_decl;
287 /* Set to 0 at beginning of a function definition, set to 1 if
288 a return statement that specifies a return value is seen. */
290 int current_function_returns_value;
292 /* Set to 0 at beginning of a function definition, set to 1 if
293 a return statement with no argument is seen. */
295 int current_function_returns_null;
297 /* Set to nonzero by `grokdeclarator' for a function
298 whose return type is defaulted, if warnings for this are desired. */
300 static int warn_about_return_type;
302 /* Nonzero when starting a function declared `extern inline'. */
304 static int current_extern_inline;
306 /* For each binding contour we allocate a binding_level structure
307 * which records the names defined in that contour.
310 * 1) one for each function definition,
311 * where internal declarations of the parameters appear.
312 * 2) one for each compound statement,
313 * to record its declarations.
315 * The current meaning of a name can be found by searching the levels from
316 * the current one out to the global one.
319 /* Note that the information in the `names' component of the global contour
320 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
324 /* A chain of _DECL nodes for all variables, constants, functions,
325 and typedef types. These are in the reverse of the order supplied.
329 /* A list of structure, union and enum definitions,
330 * for looking up tag names.
331 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
332 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
333 * or ENUMERAL_TYPE node.
337 /* For each level, a list of shadowed outer-level local definitions
338 to be restored when this level is popped.
339 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
340 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
343 /* For each level (except not the global one),
344 a chain of BLOCK nodes for all the levels
345 that were entered and exited one level down. */
348 /* The BLOCK node for this level, if one has been preallocated.
349 If 0, the BLOCK is allocated (if needed) when the level is popped. */
352 /* The binding level which this one is contained in (inherits from). */
353 struct binding_level *level_chain;
355 /* Nonzero for the level that holds the parameters of a function. */
358 /* Nonzero if this level "doesn't exist" for tags. */
359 char tag_transparent;
361 /* Nonzero if sublevels of this level "don't exist" for tags.
362 This is set in the parm level of a function definition
363 while reading the function body, so that the outermost block
364 of the function body will be tag-transparent. */
365 char subblocks_tag_transparent;
367 /* Nonzero means make a BLOCK for this level regardless of all else. */
370 /* Nonzero means make a BLOCK if this level has any subblocks. */
371 char keep_if_subblocks;
373 /* Number of decls in `names' that have incomplete
374 structure or union types. */
377 /* A list of decls giving the (reversed) specified order of parms,
378 not including any forward-decls in the parmlist.
379 This is so we can put the parms in proper order for assign_parms. */
383 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
385 /* The binding level currently in effect. */
387 static struct binding_level *current_binding_level;
389 /* A chain of binding_level structures awaiting reuse. */
391 static struct binding_level *free_binding_level;
393 /* The outermost binding level, for names of file scope.
394 This is created when the compiler is started and exists
395 through the entire run. */
397 static struct binding_level *global_binding_level;
399 /* Binding level structures are initialized by copying this one. */
401 static struct binding_level clear_binding_level
402 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
405 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
407 static int keep_next_level_flag;
409 /* Nonzero means make a BLOCK for the next level pushed
410 if it has subblocks. */
412 static int keep_next_if_subblocks;
414 /* The chain of outer levels of label scopes.
415 This uses the same data structure used for binding levels,
416 but it works differently: each link in the chain records
417 saved values of named_labels and shadowed_labels for
418 a label binding level outside the current one. */
420 static struct binding_level *label_level_chain;
422 /* Functions called automatically at the beginning and end of execution. */
424 tree static_ctors, static_dtors;
426 /* Forward declarations. */
428 static struct binding_level * make_binding_level PROTO((void));
429 static void clear_limbo_values PROTO((tree));
430 static int duplicate_decls PROTO((tree, tree, int));
431 static char *redeclaration_error_message PROTO((tree, tree));
432 static void storedecls PROTO((tree));
433 static void storetags PROTO((tree));
434 static tree lookup_tag PROTO((enum tree_code, tree,
435 struct binding_level *, int));
436 static tree lookup_tag_reverse PROTO((tree));
437 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
439 static tree grokparms PROTO((tree, int));
440 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
441 static void layout_array_type PROTO((tree));
443 /* C-specific option variables. */
445 /* Nonzero means allow type mismatches in conditional expressions;
446 just make their values `void'. */
448 int flag_cond_mismatch;
450 /* Nonzero means give `double' the same size as `float'. */
452 int flag_short_double;
454 /* Nonzero means don't recognize the keyword `asm'. */
458 /* Nonzero means don't recognize any builtin functions. */
462 /* Nonzero means don't recognize the non-ANSI builtin functions.
465 int flag_no_nonansi_builtin;
467 /* Nonzero means do some things the same way PCC does. */
469 int flag_traditional;
471 /* Nonzero means that we have builtin functions, and main is an int */
475 /* Nonzero means to allow single precision math even if we're generally
476 being traditional. */
477 int flag_allow_single_precision = 0;
479 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
481 int flag_signed_bitfields = 1;
482 int explicit_flag_signed_bitfields = 0;
484 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
486 int flag_no_ident = 0;
488 /* Nonzero means warn about use of implicit int. */
490 int warn_implicit_int;
492 /* Nonzero means warn about usage of long long when `-pedantic'. */
494 int warn_long_long = 1;
496 /* Nonzero means message about use of implicit function declarations;
497 1 means warning; 2 means error. */
499 int mesg_implicit_function_declaration;
501 /* Nonzero means give string constants the type `const char *'
502 to get extra warnings from them. These warnings will be too numerous
503 to be useful, except in thoroughly ANSIfied programs. */
505 int flag_const_strings;
507 /* Nonzero means warn about pointer casts that can drop a type qualifier
508 from the pointer target type. */
512 /* Nonzero means warn when casting a function call to a type that does
513 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
514 when there is no previous declaration of sqrt or malloc. */
516 int warn_bad_function_cast;
518 /* Warn about functions which might be candidates for attribute noreturn. */
520 int warn_missing_noreturn;
522 /* Warn about traditional constructs whose meanings changed in ANSI C. */
524 int warn_traditional;
526 /* Nonzero means warn about sizeof(function) or addition/subtraction
527 of function pointers. */
529 int warn_pointer_arith;
531 /* Nonzero means warn for non-prototype function decls
532 or non-prototyped defs without previous prototype. */
534 int warn_strict_prototypes;
536 /* Nonzero means warn for any global function def
537 without separate previous prototype decl. */
539 int warn_missing_prototypes;
541 /* Nonzero means warn for any global function def
542 without separate previous decl. */
544 int warn_missing_declarations;
546 /* Nonzero means warn about multiple (redundant) decls for the same single
547 variable or function. */
549 int warn_redundant_decls = 0;
551 /* Nonzero means warn about extern declarations of objects not at
552 file-scope level and about *all* declarations of functions (whether
553 extern or static) not at file-scope level. Note that we exclude
554 implicit function declarations. To get warnings about those, use
557 int warn_nested_externs = 0;
559 /* Warn about *printf or *scanf format/argument anomalies. */
563 /* Warn about a subscript that has type char. */
565 int warn_char_subscripts = 0;
567 /* Warn if a type conversion is done that might have confusing results. */
571 /* Warn if adding () is suggested. */
573 int warn_parentheses;
575 /* Warn if initializer is not completely bracketed. */
577 int warn_missing_braces;
579 /* Warn if main is suspicious. */
583 /* Warn about #pragma directives that are not recognised. */
585 int warn_unknown_pragmas = 0; /* Tri state variable. */
587 /* Warn about comparison of signed and unsigned values.
588 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
590 int warn_sign_compare = -1;
592 /* Nonzero means warn about use of multicharacter literals. */
594 int warn_multichar = 1;
596 /* Nonzero means `$' can be in an identifier. */
598 #ifndef DOLLARS_IN_IDENTIFIERS
599 #define DOLLARS_IN_IDENTIFIERS 1
601 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
603 /* Decode the string P as a language-specific option for C.
604 Return the number of strings consumed. */
607 c_decode_option (argc, argv)
608 int argc ATTRIBUTE_UNUSED;
611 int strings_processed;
614 if (! cpp_initialized)
616 cpp_reader_init (&parse_in);
617 parse_in.data = &parse_options;
618 cpp_options_init (&parse_options);
621 strings_processed = cpp_handle_option (&parse_in, argc, argv);
623 strings_processed = 0;
624 #endif /* ! USE_CPPLIB */
626 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
628 flag_traditional = 1;
629 flag_writable_strings = 1;
631 else if (!strcmp (p, "-fallow-single-precision"))
632 flag_allow_single_precision = 1;
633 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
638 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
642 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
646 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
648 flag_traditional = 0;
649 flag_writable_strings = 0;
651 else if (!strcmp (p, "-fdollars-in-identifiers"))
652 dollars_in_ident = 1;
653 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
654 dollars_in_ident = 0;
655 else if (!strcmp (p, "-fsigned-char"))
656 flag_signed_char = 1;
657 else if (!strcmp (p, "-funsigned-char"))
658 flag_signed_char = 0;
659 else if (!strcmp (p, "-fno-signed-char"))
660 flag_signed_char = 0;
661 else if (!strcmp (p, "-fno-unsigned-char"))
662 flag_signed_char = 1;
663 else if (!strcmp (p, "-fsigned-bitfields")
664 || !strcmp (p, "-fno-unsigned-bitfields"))
666 flag_signed_bitfields = 1;
667 explicit_flag_signed_bitfields = 1;
669 else if (!strcmp (p, "-funsigned-bitfields")
670 || !strcmp (p, "-fno-signed-bitfields"))
672 flag_signed_bitfields = 0;
673 explicit_flag_signed_bitfields = 1;
675 else if (!strcmp (p, "-fshort-enums"))
676 flag_short_enums = 1;
677 else if (!strcmp (p, "-fno-short-enums"))
678 flag_short_enums = 0;
679 else if (!strcmp (p, "-fcond-mismatch"))
680 flag_cond_mismatch = 1;
681 else if (!strcmp (p, "-fno-cond-mismatch"))
682 flag_cond_mismatch = 0;
683 else if (!strcmp (p, "-fshort-double"))
684 flag_short_double = 1;
685 else if (!strcmp (p, "-fno-short-double"))
686 flag_short_double = 0;
687 else if (!strcmp (p, "-fasm"))
689 else if (!strcmp (p, "-fno-asm"))
691 else if (!strcmp (p, "-fbuiltin"))
693 else if (!strcmp (p, "-fno-builtin"))
695 else if (!strcmp (p, "-fno-ident"))
697 else if (!strcmp (p, "-fident"))
699 else if (!strcmp (p, "-ansi"))
700 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
701 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
702 mesg_implicit_function_declaration = 2;
703 else if (!strcmp (p, "-Wimplicit-function-declaration"))
704 mesg_implicit_function_declaration = 1;
705 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
706 mesg_implicit_function_declaration = 0;
707 else if (!strcmp (p, "-Wimplicit-int"))
708 warn_implicit_int = 1;
709 else if (!strcmp (p, "-Wno-implicit-int"))
710 warn_implicit_int = 0;
711 else if (!strcmp (p, "-Wimplicit"))
713 warn_implicit_int = 1;
714 if (mesg_implicit_function_declaration != 2)
715 mesg_implicit_function_declaration = 1;
717 else if (!strcmp (p, "-Wno-implicit"))
718 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
719 else if (!strcmp (p, "-Wlong-long"))
721 else if (!strcmp (p, "-Wno-long-long"))
723 else if (!strcmp (p, "-Wwrite-strings"))
724 flag_const_strings = 1;
725 else if (!strcmp (p, "-Wno-write-strings"))
726 flag_const_strings = 0;
727 else if (!strcmp (p, "-Wcast-qual"))
729 else if (!strcmp (p, "-Wno-cast-qual"))
731 else if (!strcmp (p, "-Wbad-function-cast"))
732 warn_bad_function_cast = 1;
733 else if (!strcmp (p, "-Wno-bad-function-cast"))
734 warn_bad_function_cast = 0;
735 else if (!strcmp (p, "-Wmissing-noreturn"))
736 warn_missing_noreturn = 1;
737 else if (!strcmp (p, "-Wno-missing-noreturn"))
738 warn_missing_noreturn = 0;
739 else if (!strcmp (p, "-Wpointer-arith"))
740 warn_pointer_arith = 1;
741 else if (!strcmp (p, "-Wno-pointer-arith"))
742 warn_pointer_arith = 0;
743 else if (!strcmp (p, "-Wstrict-prototypes"))
744 warn_strict_prototypes = 1;
745 else if (!strcmp (p, "-Wno-strict-prototypes"))
746 warn_strict_prototypes = 0;
747 else if (!strcmp (p, "-Wmissing-prototypes"))
748 warn_missing_prototypes = 1;
749 else if (!strcmp (p, "-Wno-missing-prototypes"))
750 warn_missing_prototypes = 0;
751 else if (!strcmp (p, "-Wmissing-declarations"))
752 warn_missing_declarations = 1;
753 else if (!strcmp (p, "-Wno-missing-declarations"))
754 warn_missing_declarations = 0;
755 else if (!strcmp (p, "-Wredundant-decls"))
756 warn_redundant_decls = 1;
757 else if (!strcmp (p, "-Wno-redundant-decls"))
758 warn_redundant_decls = 0;
759 else if (!strcmp (p, "-Wnested-externs"))
760 warn_nested_externs = 1;
761 else if (!strcmp (p, "-Wno-nested-externs"))
762 warn_nested_externs = 0;
763 else if (!strcmp (p, "-Wtraditional"))
764 warn_traditional = 1;
765 else if (!strcmp (p, "-Wno-traditional"))
766 warn_traditional = 0;
767 else if (!strcmp (p, "-Wformat"))
769 else if (!strcmp (p, "-Wno-format"))
771 else if (!strcmp (p, "-Wchar-subscripts"))
772 warn_char_subscripts = 1;
773 else if (!strcmp (p, "-Wno-char-subscripts"))
774 warn_char_subscripts = 0;
775 else if (!strcmp (p, "-Wconversion"))
777 else if (!strcmp (p, "-Wno-conversion"))
779 else if (!strcmp (p, "-Wparentheses"))
780 warn_parentheses = 1;
781 else if (!strcmp (p, "-Wno-parentheses"))
782 warn_parentheses = 0;
783 else if (!strcmp (p, "-Wreturn-type"))
784 warn_return_type = 1;
785 else if (!strcmp (p, "-Wno-return-type"))
786 warn_return_type = 0;
787 else if (!strcmp (p, "-Wcomment"))
788 ; /* cpp handles this one. */
789 else if (!strcmp (p, "-Wno-comment"))
790 ; /* cpp handles this one. */
791 else if (!strcmp (p, "-Wcomments"))
792 ; /* cpp handles this one. */
793 else if (!strcmp (p, "-Wno-comments"))
794 ; /* cpp handles this one. */
795 else if (!strcmp (p, "-Wtrigraphs"))
796 ; /* cpp handles this one. */
797 else if (!strcmp (p, "-Wno-trigraphs"))
798 ; /* cpp handles this one. */
799 else if (!strcmp (p, "-Wundef"))
800 ; /* cpp handles this one. */
801 else if (!strcmp (p, "-Wno-undef"))
802 ; /* cpp handles this one. */
803 else if (!strcmp (p, "-Wimport"))
804 ; /* cpp handles this one. */
805 else if (!strcmp (p, "-Wno-import"))
806 ; /* cpp handles this one. */
807 else if (!strcmp (p, "-Wmissing-braces"))
808 warn_missing_braces = 1;
809 else if (!strcmp (p, "-Wno-missing-braces"))
810 warn_missing_braces = 0;
811 else if (!strcmp (p, "-Wmain"))
813 else if (!strcmp (p, "-Wno-main"))
815 else if (!strcmp (p, "-Wsign-compare"))
816 warn_sign_compare = 1;
817 else if (!strcmp (p, "-Wno-sign-compare"))
818 warn_sign_compare = 0;
819 else if (!strcmp (p, "-Wmultichar"))
821 else if (!strcmp (p, "-Wno-multichar"))
823 else if (!strcmp (p, "-Wunknown-pragmas"))
824 /* Set to greater than 1, so that even unknown pragmas in system
825 headers will be warned about. */
826 warn_unknown_pragmas = 2;
827 else if (!strcmp (p, "-Wno-unknown-pragmas"))
828 warn_unknown_pragmas = 0;
829 else if (!strcmp (p, "-Wall"))
831 /* We save the value of warn_uninitialized, since if they put
832 -Wuninitialized on the command line, we need to generate a
833 warning about not using it without also specifying -O. */
834 if (warn_uninitialized != 1)
835 warn_uninitialized = 2;
836 warn_implicit_int = 1;
837 mesg_implicit_function_declaration = 1;
838 warn_return_type = 1;
842 warn_char_subscripts = 1;
843 warn_parentheses = 1;
844 warn_missing_braces = 1;
845 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
846 it off only if it's not explicit. */
848 /* Only warn about unknown pragmas that are not in system headers. */
849 warn_unknown_pragmas = 1;
852 return strings_processed;
857 /* Hooks for print_node. */
860 print_lang_decl (file, node, indent)
861 FILE *file ATTRIBUTE_UNUSED;
862 tree node ATTRIBUTE_UNUSED;
863 int indent ATTRIBUTE_UNUSED;
868 print_lang_type (file, node, indent)
869 FILE *file ATTRIBUTE_UNUSED;
870 tree node ATTRIBUTE_UNUSED;
871 int indent ATTRIBUTE_UNUSED;
876 print_lang_identifier (file, node, indent)
881 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
882 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
883 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
884 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
885 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
886 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
889 /* Hook called at end of compilation to assume 1 elt
890 for a top-level array decl that wasn't complete before. */
893 finish_incomplete_decl (decl)
896 if (TREE_CODE (decl) == VAR_DECL)
898 tree type = TREE_TYPE (decl);
899 if (type != error_mark_node
900 && TREE_CODE (type) == ARRAY_TYPE
901 && TYPE_DOMAIN (type) == 0)
903 if (! DECL_EXTERNAL (decl))
904 warning_with_decl (decl, "array `%s' assumed to have one element");
906 complete_array_type (type, NULL_TREE, 1);
908 layout_decl (decl, 0);
913 /* Create a new `struct binding_level'. */
916 struct binding_level *
917 make_binding_level ()
920 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
923 /* Nonzero if we are currently in the global binding level. */
928 return current_binding_level == global_binding_level;
934 keep_next_level_flag = 1;
937 /* Nonzero if the current level needs to have a BLOCK made. */
942 return ((current_binding_level->keep_if_subblocks
943 && current_binding_level->blocks != 0)
944 || current_binding_level->keep
945 || current_binding_level->names != 0
946 || (current_binding_level->tags != 0
947 && !current_binding_level->tag_transparent));
950 /* Identify this binding level as a level of parameters.
951 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
952 But it turns out there is no way to pass the right value for
953 DEFINITION_FLAG, so we ignore it. */
956 declare_parm_level (definition_flag)
957 int definition_flag ATTRIBUTE_UNUSED;
959 current_binding_level->parm_flag = 1;
962 /* Nonzero if currently making parm declarations. */
967 return current_binding_level->parm_flag;
970 /* Enter a new binding level.
971 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
972 not for that of tags. */
975 pushlevel (tag_transparent)
978 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
980 /* If this is the top level of a function,
981 just make sure that NAMED_LABELS is 0. */
983 if (current_binding_level == global_binding_level)
988 /* Reuse or create a struct for this binding level. */
990 if (free_binding_level)
992 newlevel = free_binding_level;
993 free_binding_level = free_binding_level->level_chain;
997 newlevel = make_binding_level ();
1000 /* Add this level to the front of the chain (stack) of levels that
1003 *newlevel = clear_binding_level;
1004 newlevel->tag_transparent
1006 || (current_binding_level
1007 ? current_binding_level->subblocks_tag_transparent
1009 newlevel->level_chain = current_binding_level;
1010 current_binding_level = newlevel;
1011 newlevel->keep = keep_next_level_flag;
1012 keep_next_level_flag = 0;
1013 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1014 keep_next_if_subblocks = 0;
1017 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1020 clear_limbo_values (block)
1025 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1026 if (DECL_NAME (tem) != 0)
1027 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1029 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1030 clear_limbo_values (tem);
1033 /* Exit a binding level.
1034 Pop the level off, and restore the state of the identifier-decl mappings
1035 that were in effect when this level was entered.
1037 If KEEP is nonzero, this level had explicit declarations, so
1038 and create a "block" (a BLOCK node) for the level
1039 to record its declarations and subblocks for symbol table output.
1041 If FUNCTIONBODY is nonzero, this level is the body of a function,
1042 so create a block as if KEEP were set and also clear out all
1045 If REVERSE is nonzero, reverse the order of decls before putting
1046 them into the BLOCK. */
1049 poplevel (keep, reverse, functionbody)
1055 /* The chain of decls was accumulated in reverse order.
1056 Put it into forward order, just for cleanliness. */
1058 tree tags = current_binding_level->tags;
1059 tree subblocks = current_binding_level->blocks;
1062 int block_previously_created;
1064 keep |= current_binding_level->keep;
1066 /* This warning is turned off because it causes warnings for
1067 declarations like `extern struct foo *x'. */
1069 /* Warn about incomplete structure types in this level. */
1070 for (link = tags; link; link = TREE_CHAIN (link))
1071 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1073 tree type = TREE_VALUE (link);
1075 switch (TREE_CODE (type))
1078 errmsg = "`struct %s' incomplete in scope ending here";
1081 errmsg = "`union %s' incomplete in scope ending here";
1084 errmsg = "`enum %s' incomplete in scope ending here";
1087 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1088 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1090 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1091 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1095 /* Get the decls in the order they were written.
1096 Usually current_binding_level->names is in reverse order.
1097 But parameter decls were previously put in forward order. */
1100 current_binding_level->names
1101 = decls = nreverse (current_binding_level->names);
1103 decls = current_binding_level->names;
1105 /* Output any nested inline functions within this block
1106 if they weren't already output. */
1108 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1109 if (TREE_CODE (decl) == FUNCTION_DECL
1110 && ! TREE_ASM_WRITTEN (decl)
1111 && DECL_INITIAL (decl) != 0
1112 && TREE_ADDRESSABLE (decl))
1114 /* If this decl was copied from a file-scope decl
1115 on account of a block-scope extern decl,
1116 propagate TREE_ADDRESSABLE to the file-scope decl.
1118 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1119 true, since then the decl goes through save_for_inline_copying. */
1120 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1121 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1122 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1123 else if (DECL_SAVED_INSNS (decl) != 0)
1125 push_function_context ();
1126 output_inline_function (decl);
1127 pop_function_context ();
1131 /* If there were any declarations or structure tags in that level,
1132 or if this level is a function body,
1133 create a BLOCK to record them for the life of this function. */
1136 block_previously_created = (current_binding_level->this_block != 0);
1137 if (block_previously_created)
1138 block = current_binding_level->this_block;
1139 else if (keep || functionbody
1140 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1141 block = make_node (BLOCK);
1144 BLOCK_VARS (block) = decls;
1145 BLOCK_TYPE_TAGS (block) = tags;
1146 BLOCK_SUBBLOCKS (block) = subblocks;
1147 remember_end_note (block);
1150 /* In each subblock, record that this is its superior. */
1152 for (link = subblocks; link; link = TREE_CHAIN (link))
1153 BLOCK_SUPERCONTEXT (link) = block;
1155 /* Clear out the meanings of the local variables of this level. */
1157 for (link = decls; link; link = TREE_CHAIN (link))
1159 if (DECL_NAME (link) != 0)
1161 /* If the ident. was used or addressed via a local extern decl,
1162 don't forget that fact. */
1163 if (DECL_EXTERNAL (link))
1165 if (TREE_USED (link))
1166 TREE_USED (DECL_NAME (link)) = 1;
1167 if (TREE_ADDRESSABLE (link))
1168 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1170 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1174 /* Restore all name-meanings of the outer levels
1175 that were shadowed by this level. */
1177 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1178 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1180 /* If the level being exited is the top level of a function,
1181 check over all the labels, and clear out the current
1182 (function local) meanings of their names. */
1186 clear_limbo_values (block);
1188 /* If this is the top level block of a function,
1189 the vars are the function's parameters.
1190 Don't leave them in the BLOCK because they are
1191 found in the FUNCTION_DECL instead. */
1193 BLOCK_VARS (block) = 0;
1195 /* Clear out the definitions of all label names,
1196 since their scopes end here,
1197 and add them to BLOCK_VARS. */
1199 for (link = named_labels; link; link = TREE_CHAIN (link))
1201 register tree label = TREE_VALUE (link);
1203 if (DECL_INITIAL (label) == 0)
1205 error_with_decl (label, "label `%s' used but not defined");
1206 /* Avoid crashing later. */
1207 define_label (input_filename, lineno,
1210 else if (warn_unused && !TREE_USED (label))
1211 warning_with_decl (label, "label `%s' defined but not used");
1212 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1214 /* Put the labels into the "variables" of the
1215 top-level block, so debugger can see them. */
1216 TREE_CHAIN (label) = BLOCK_VARS (block);
1217 BLOCK_VARS (block) = label;
1221 /* Pop the current level, and free the structure for reuse. */
1224 register struct binding_level *level = current_binding_level;
1225 current_binding_level = current_binding_level->level_chain;
1227 level->level_chain = free_binding_level;
1228 free_binding_level = level;
1231 /* Dispose of the block that we just made inside some higher level. */
1233 DECL_INITIAL (current_function_decl) = block;
1236 if (!block_previously_created)
1237 current_binding_level->blocks
1238 = chainon (current_binding_level->blocks, block);
1240 /* If we did not make a block for the level just exited,
1241 any blocks made for inner levels
1242 (since they cannot be recorded as subblocks in that level)
1243 must be carried forward so they will later become subblocks
1244 of something else. */
1246 current_binding_level->blocks
1247 = chainon (current_binding_level->blocks, subblocks);
1249 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1250 binding contour so that they point to the appropriate construct, i.e.
1251 either to the current FUNCTION_DECL node, or else to the BLOCK node
1252 we just constructed.
1254 Note that for tagged types whose scope is just the formal parameter
1255 list for some function type specification, we can't properly set
1256 their TYPE_CONTEXTs here, because we don't have a pointer to the
1257 appropriate FUNCTION_TYPE node readily available to us. For those
1258 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1259 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1260 node which will represent the "scope" for these "parameter list local"
1265 for (link = tags; link; link = TREE_CHAIN (link))
1266 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1268 for (link = tags; link; link = TREE_CHAIN (link))
1269 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1272 TREE_USED (block) = 1;
1276 /* Delete the node BLOCK from the current binding level.
1277 This is used for the block inside a stmt expr ({...})
1278 so that the block can be reinserted where appropriate. */
1281 delete_block (block)
1285 if (current_binding_level->blocks == block)
1286 current_binding_level->blocks = TREE_CHAIN (block);
1287 for (t = current_binding_level->blocks; t;)
1289 if (TREE_CHAIN (t) == block)
1290 TREE_CHAIN (t) = TREE_CHAIN (block);
1294 TREE_CHAIN (block) = NULL;
1295 /* Clear TREE_USED which is always set by poplevel.
1296 The flag is set again if insert_block is called. */
1297 TREE_USED (block) = 0;
1300 /* Insert BLOCK at the end of the list of subblocks of the
1301 current binding level. This is used when a BIND_EXPR is expanded,
1302 to handle the BLOCK node inside the BIND_EXPR. */
1305 insert_block (block)
1308 TREE_USED (block) = 1;
1309 current_binding_level->blocks
1310 = chainon (current_binding_level->blocks, block);
1313 /* Set the BLOCK node for the innermost scope
1314 (the one we are currently in). */
1318 register tree block;
1320 current_binding_level->this_block = block;
1326 register struct binding_level *newlevel;
1328 /* Reuse or create a struct for this binding level. */
1330 if (free_binding_level)
1332 newlevel = free_binding_level;
1333 free_binding_level = free_binding_level->level_chain;
1337 newlevel = make_binding_level ();
1340 /* Add this level to the front of the chain (stack) of label levels. */
1342 newlevel->level_chain = label_level_chain;
1343 label_level_chain = newlevel;
1345 newlevel->names = named_labels;
1346 newlevel->shadowed = shadowed_labels;
1348 shadowed_labels = 0;
1354 register struct binding_level *level = label_level_chain;
1357 /* Clear out the definitions of the declared labels in this level.
1358 Leave in the list any ordinary, non-declared labels. */
1359 for (link = named_labels, prev = 0; link;)
1361 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1363 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1365 error_with_decl (TREE_VALUE (link),
1366 "label `%s' used but not defined");
1367 /* Avoid crashing later. */
1368 define_label (input_filename, lineno,
1369 DECL_NAME (TREE_VALUE (link)));
1371 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1372 warning_with_decl (TREE_VALUE (link),
1373 "label `%s' defined but not used");
1374 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1376 /* Delete this element from the list. */
1377 link = TREE_CHAIN (link);
1379 TREE_CHAIN (prev) = link;
1381 named_labels = link;
1386 link = TREE_CHAIN (link);
1390 /* Bring back all the labels that were shadowed. */
1391 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1392 if (DECL_NAME (TREE_VALUE (link)) != 0)
1393 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1394 = TREE_VALUE (link);
1396 named_labels = chainon (named_labels, level->names);
1397 shadowed_labels = level->shadowed;
1399 /* Pop the current level, and free the structure for reuse. */
1400 label_level_chain = label_level_chain->level_chain;
1401 level->level_chain = free_binding_level;
1402 free_binding_level = level;
1405 /* Push a definition or a declaration of struct, union or enum tag "name".
1406 "type" should be the type node.
1407 We assume that the tag "name" is not already defined.
1409 Note that the definition may really be just a forward reference.
1410 In that case, the TYPE_SIZE will be zero. */
1413 pushtag (name, type)
1416 register struct binding_level *b;
1418 /* Find the proper binding level for this type tag. */
1420 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1425 /* Record the identifier as the type's name if it has none. */
1427 if (TYPE_NAME (type) == 0)
1428 TYPE_NAME (type) = name;
1431 if (b == global_binding_level)
1432 b->tags = perm_tree_cons (name, type, b->tags);
1434 b->tags = saveable_tree_cons (name, type, b->tags);
1436 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1437 tagged type we just added to the current binding level. This fake
1438 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1439 to output a representation of a tagged type, and it also gives
1440 us a convenient place to record the "scope start" address for the
1443 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1445 /* An approximation for now, so we can tell this is a function-scope tag.
1446 This will be updated in poplevel. */
1447 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1450 /* Handle when a new declaration NEWDECL
1451 has the same name as an old one OLDDECL
1452 in the same binding contour.
1453 Prints an error message if appropriate.
1455 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1456 Otherwise, return 0.
1458 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1459 and OLDDECL is in an outer binding level and should thus not be changed. */
1462 duplicate_decls (newdecl, olddecl, different_binding_level)
1463 register tree newdecl, olddecl;
1464 int different_binding_level;
1466 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1467 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1468 && DECL_INITIAL (newdecl) != 0);
1469 tree oldtype = TREE_TYPE (olddecl);
1470 tree newtype = TREE_TYPE (newdecl);
1473 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1474 DECL_MACHINE_ATTRIBUTES (newdecl)
1475 = merge_machine_decl_attributes (olddecl, newdecl);
1477 if (TREE_CODE (newtype) == ERROR_MARK
1478 || TREE_CODE (oldtype) == ERROR_MARK)
1481 /* New decl is completely inconsistent with the old one =>
1482 tell caller to replace the old one.
1483 This is always an error except in the case of shadowing a builtin. */
1484 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1486 if (TREE_CODE (olddecl) == FUNCTION_DECL
1487 && (DECL_BUILT_IN (olddecl)
1488 || DECL_BUILT_IN_NONANSI (olddecl)))
1490 /* If you declare a built-in or predefined function name as static,
1491 the old definition is overridden,
1492 but optionally warn this was a bad choice of name. */
1493 if (!TREE_PUBLIC (newdecl))
1497 else if (DECL_BUILT_IN (olddecl))
1498 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1500 warning_with_decl (newdecl, "shadowing library function `%s'");
1502 /* Likewise, if the built-in is not ansi, then programs can
1503 override it even globally without an error. */
1504 else if (! DECL_BUILT_IN (olddecl))
1505 warning_with_decl (newdecl,
1506 "library function `%s' declared as non-function");
1508 else if (DECL_BUILT_IN_NONANSI (olddecl))
1509 warning_with_decl (newdecl,
1510 "built-in function `%s' declared as non-function");
1512 warning_with_decl (newdecl,
1513 "built-in function `%s' declared as non-function");
1517 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1518 error_with_decl (olddecl, "previous declaration of `%s'");
1524 /* For real parm decl following a forward decl,
1525 return 1 so old decl will be reused. */
1526 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1527 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1530 /* The new declaration is the same kind of object as the old one.
1531 The declarations may partially match. Print warnings if they don't
1532 match enough. Ultimately, copy most of the information from the new
1533 decl to the old one, and keep using the old one. */
1535 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1536 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1537 && DECL_INITIAL (olddecl) == 0)
1538 /* If -traditional, avoid error for redeclaring fcn
1539 after implicit decl. */
1541 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1542 && DECL_BUILT_IN (olddecl))
1544 /* A function declaration for a built-in function. */
1545 if (!TREE_PUBLIC (newdecl))
1547 /* If you declare a built-in function name as static, the
1548 built-in definition is overridden,
1549 but optionally warn this was a bad choice of name. */
1551 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1552 /* Discard the old built-in function. */
1555 else if (!types_match)
1557 /* Accept the return type of the new declaration if same modes. */
1558 tree oldreturntype = TREE_TYPE (oldtype);
1559 tree newreturntype = TREE_TYPE (newtype);
1561 /* Make sure we put the new type in the same obstack as the old ones.
1562 If the old types are not both in the same obstack, use the
1564 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1565 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1568 push_obstacks_nochange ();
1569 end_temporary_allocation ();
1572 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1574 /* Function types may be shared, so we can't just modify
1575 the return type of olddecl's function type. */
1577 = build_function_type (newreturntype,
1578 TYPE_ARG_TYPES (oldtype));
1580 types_match = comptypes (newtype, trytype);
1584 /* Accept harmless mismatch in first argument type also.
1586 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1587 && TYPE_ARG_TYPES (oldtype) != 0
1588 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1589 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1590 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1591 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1593 /* Function types may be shared, so we can't just modify
1594 the return type of olddecl's function type. */
1596 = build_function_type (TREE_TYPE (oldtype),
1597 tree_cons (NULL_TREE,
1598 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1599 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1601 types_match = comptypes (newtype, trytype);
1605 if (! different_binding_level)
1606 TREE_TYPE (olddecl) = oldtype;
1612 /* If types don't match for a built-in, throw away the built-in. */
1613 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1617 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1618 && DECL_SOURCE_LINE (olddecl) == 0)
1620 /* A function declaration for a predeclared function
1621 that isn't actually built in. */
1622 if (!TREE_PUBLIC (newdecl))
1624 /* If you declare it as static, the
1625 default definition is overridden. */
1628 else if (!types_match)
1630 /* If the types don't match, preserve volatility indication.
1631 Later on, we will discard everything else about the
1632 default declaration. */
1633 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1636 /* Permit char *foo () to match void *foo (...) if not pedantic,
1637 if one of them came from a system header file. */
1638 else if (!types_match
1639 && TREE_CODE (olddecl) == FUNCTION_DECL
1640 && TREE_CODE (newdecl) == FUNCTION_DECL
1641 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1642 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1643 && (DECL_IN_SYSTEM_HEADER (olddecl)
1644 || DECL_IN_SYSTEM_HEADER (newdecl))
1645 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1646 && TYPE_ARG_TYPES (oldtype) == 0
1647 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1648 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1650 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1651 && TYPE_ARG_TYPES (newtype) == 0
1652 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1653 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1656 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1657 /* Make sure we keep void * as ret type, not char *. */
1658 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1659 TREE_TYPE (newdecl) = newtype = oldtype;
1661 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1662 we will come back here again. */
1663 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1665 else if (!types_match
1666 /* Permit char *foo (int, ...); followed by char *foo ();
1668 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1670 /* Return types must still match. */
1671 && comptypes (TREE_TYPE (oldtype),
1672 TREE_TYPE (newtype))
1673 && TYPE_ARG_TYPES (newtype) == 0))
1675 error_with_decl (newdecl, "conflicting types for `%s'");
1676 /* Check for function type mismatch
1677 involving an empty arglist vs a nonempty one. */
1678 if (TREE_CODE (olddecl) == FUNCTION_DECL
1679 && comptypes (TREE_TYPE (oldtype),
1680 TREE_TYPE (newtype))
1681 && ((TYPE_ARG_TYPES (oldtype) == 0
1682 && DECL_INITIAL (olddecl) == 0)
1684 (TYPE_ARG_TYPES (newtype) == 0
1685 && DECL_INITIAL (newdecl) == 0)))
1687 /* Classify the problem further. */
1688 register tree t = TYPE_ARG_TYPES (oldtype);
1690 t = TYPE_ARG_TYPES (newtype);
1691 for (; t; t = TREE_CHAIN (t))
1693 register tree type = TREE_VALUE (t);
1695 if (TREE_CHAIN (t) == 0
1696 && TYPE_MAIN_VARIANT (type) != void_type_node)
1698 error ("A parameter list with an ellipsis can't match");
1699 error ("an empty parameter name list declaration.");
1703 if (TYPE_MAIN_VARIANT (type) == float_type_node
1704 || C_PROMOTING_INTEGER_TYPE_P (type))
1706 error ("An argument type that has a default promotion");
1707 error ("can't match an empty parameter name list declaration.");
1712 error_with_decl (olddecl, "previous declaration of `%s'");
1716 errmsg = redeclaration_error_message (newdecl, olddecl);
1719 error_with_decl (newdecl, errmsg);
1720 error_with_decl (olddecl,
1721 ((DECL_INITIAL (olddecl)
1722 && current_binding_level == global_binding_level)
1723 ? "`%s' previously defined here"
1724 : "`%s' previously declared here"));
1726 else if (TREE_CODE (newdecl) == TYPE_DECL
1727 && (DECL_IN_SYSTEM_HEADER (olddecl)
1728 || DECL_IN_SYSTEM_HEADER (newdecl)))
1730 warning_with_decl (newdecl, "redefinition of `%s'");
1733 ((DECL_INITIAL (olddecl)
1734 && current_binding_level == global_binding_level)
1735 ? "`%s' previously defined here"
1736 : "`%s' previously declared here"));
1738 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1739 && DECL_INITIAL (olddecl) != 0
1740 && TYPE_ARG_TYPES (oldtype) == 0
1741 && TYPE_ARG_TYPES (newtype) != 0
1742 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1744 register tree type, parm;
1746 /* Prototype decl follows defn w/o prototype. */
1748 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1749 type = TYPE_ARG_TYPES (newtype),
1751 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1752 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1753 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1755 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1756 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1758 errmsg = "prototype for `%s' follows and number of arguments";
1761 /* Type for passing arg must be consistent
1762 with that declared for the arg. */
1763 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1764 /* If -traditional, allow `unsigned int' instead of `int'
1765 in the prototype. */
1766 && (! (flag_traditional
1767 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1768 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1770 errmsg = "prototype for `%s' follows and argument %d";
1776 error_with_decl (newdecl, errmsg, nargs);
1777 error_with_decl (olddecl,
1778 "doesn't match non-prototype definition here");
1782 warning_with_decl (newdecl, "prototype for `%s' follows");
1783 warning_with_decl (olddecl, "non-prototype definition here");
1786 /* Warn about mismatches in various flags. */
1789 /* Warn if function is now inline
1790 but was previously declared not inline and has been called. */
1791 if (TREE_CODE (olddecl) == FUNCTION_DECL
1792 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1793 && TREE_USED (olddecl))
1794 warning_with_decl (newdecl,
1795 "`%s' declared inline after being called");
1796 if (TREE_CODE (olddecl) == FUNCTION_DECL
1797 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1798 && DECL_INITIAL (olddecl) != 0)
1799 warning_with_decl (newdecl,
1800 "`%s' declared inline after its definition");
1802 /* If pedantic, warn when static declaration follows a non-static
1803 declaration. Otherwise, do so only for functions. */
1804 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1805 && TREE_PUBLIC (olddecl)
1806 && !TREE_PUBLIC (newdecl))
1807 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1809 /* Warn when const declaration follows a non-const
1810 declaration, but not for functions. */
1811 if (TREE_CODE (olddecl) != FUNCTION_DECL
1812 && !TREE_READONLY (olddecl)
1813 && TREE_READONLY (newdecl))
1814 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1815 /* These bits are logically part of the type, for variables.
1816 But not for functions
1817 (where qualifiers are not valid ANSI anyway). */
1818 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1819 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1820 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1821 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1825 /* Optionally warn about more than one declaration for the same name. */
1826 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1827 /* Don't warn about a function declaration
1828 followed by a definition. */
1829 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1830 && DECL_INITIAL (olddecl) == 0)
1831 /* Don't warn about extern decl followed by (tentative) definition. */
1832 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1834 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1835 warning_with_decl (olddecl, "previous declaration of `%s'");
1838 /* Copy all the DECL_... slots specified in the new decl
1839 except for any that we copy here from the old type.
1841 Past this point, we don't change OLDTYPE and NEWTYPE
1842 even if we change the types of NEWDECL and OLDDECL. */
1846 /* When copying info to olddecl, we store into write_olddecl
1847 instead. This allows us to avoid modifying olddecl when
1848 different_binding_level is true. */
1849 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1851 /* Make sure we put the new type in the same obstack as the old ones.
1852 If the old types are not both in the same obstack, use the permanent
1854 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1855 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1858 push_obstacks_nochange ();
1859 end_temporary_allocation ();
1862 /* Merge the data types specified in the two decls. */
1863 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1865 if (different_binding_level)
1867 = build_type_attribute_variant
1869 merge_attributes (TYPE_ATTRIBUTES (newtype),
1870 TYPE_ATTRIBUTES (oldtype)));
1873 = TREE_TYPE (olddecl)
1874 = common_type (newtype, oldtype);
1877 /* Lay the type out, unless already done. */
1878 if (oldtype != TREE_TYPE (newdecl))
1880 if (TREE_TYPE (newdecl) != error_mark_node)
1881 layout_type (TREE_TYPE (newdecl));
1882 if (TREE_CODE (newdecl) != FUNCTION_DECL
1883 && TREE_CODE (newdecl) != TYPE_DECL
1884 && TREE_CODE (newdecl) != CONST_DECL)
1885 layout_decl (newdecl, 0);
1889 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1890 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1891 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1892 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1893 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1896 /* Keep the old rtl since we can safely use it. */
1897 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1899 /* Merge the type qualifiers. */
1900 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1901 && !TREE_THIS_VOLATILE (newdecl))
1902 TREE_THIS_VOLATILE (write_olddecl) = 0;
1903 if (TREE_READONLY (newdecl))
1904 TREE_READONLY (write_olddecl) = 1;
1905 if (TREE_THIS_VOLATILE (newdecl))
1907 TREE_THIS_VOLATILE (write_olddecl) = 1;
1908 if (TREE_CODE (newdecl) == VAR_DECL)
1909 make_var_volatile (newdecl);
1912 /* Keep source location of definition rather than declaration. */
1913 /* When called with different_binding_level set, keep the old
1914 information so that meaningful diagnostics can be given. */
1915 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1916 && ! different_binding_level)
1918 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1919 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1922 /* Merge the unused-warning information. */
1923 if (DECL_IN_SYSTEM_HEADER (olddecl))
1924 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1925 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1926 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1928 /* Merge the initialization information. */
1929 /* When called with different_binding_level set, don't copy over
1930 DECL_INITIAL, so that we don't accidentally change function
1931 declarations into function definitions. */
1932 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1933 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1935 /* Merge the section attribute.
1936 We want to issue an error if the sections conflict but that must be
1937 done later in decl_attributes since we are called before attributes
1939 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1940 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1942 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1944 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1945 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1947 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1948 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1949 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1950 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1955 /* If cannot merge, then use the new type and qualifiers,
1956 and don't preserve the old rtl. */
1957 else if (! different_binding_level)
1959 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1960 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1961 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1962 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1965 /* Merge the storage class information. */
1966 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1967 /* For functions, static overrides non-static. */
1968 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1970 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1971 /* This is since we don't automatically
1972 copy the attributes of NEWDECL into OLDDECL. */
1973 /* No need to worry about different_binding_level here because
1974 then TREE_PUBLIC (newdecl) was true. */
1975 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1976 /* If this clears `static', clear it in the identifier too. */
1977 if (! TREE_PUBLIC (olddecl))
1978 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1980 if (DECL_EXTERNAL (newdecl))
1982 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1983 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1984 /* An extern decl does not override previous storage class. */
1985 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1986 if (! DECL_EXTERNAL (newdecl))
1987 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1991 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1992 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1995 /* If either decl says `inline', this fn is inline,
1996 unless its definition was passed already. */
1997 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1998 DECL_INLINE (olddecl) = 1;
1999 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
2001 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2003 if (DECL_BUILT_IN (olddecl))
2005 /* Get rid of any built-in function if new arg types don't match it
2006 or if we have a function definition. */
2007 if (! types_match || new_is_definition)
2009 if (! different_binding_level)
2011 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2012 DECL_BUILT_IN (olddecl) = 0;
2017 /* If redeclaring a builtin function, and not a definition,
2018 it stays built in. */
2019 DECL_BUILT_IN (newdecl) = 1;
2020 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2023 /* Also preserve various other info from the definition. */
2024 else if (! new_is_definition)
2025 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2026 if (! new_is_definition)
2028 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2029 /* When called with different_binding_level set, don't copy over
2030 DECL_INITIAL, so that we don't accidentally change function
2031 declarations into function definitions. */
2032 if (! different_binding_level)
2033 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2034 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2035 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2036 if (DECL_INLINE (newdecl))
2037 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2040 if (different_binding_level)
2042 /* Don't output a duplicate symbol or debugging information for this
2045 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2046 just have two declarations without a definition. VAR_DECLs may need
2047 the same treatment, I'm not sure. */
2048 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2049 DECL_IGNORED_P (newdecl) = 1;
2051 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2055 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2056 But preserve OLDDECL's DECL_UID. */
2058 register unsigned olddecl_uid = DECL_UID (olddecl);
2060 bcopy ((char *) newdecl + sizeof (struct tree_common),
2061 (char *) olddecl + sizeof (struct tree_common),
2062 sizeof (struct tree_decl) - sizeof (struct tree_common));
2063 DECL_UID (olddecl) = olddecl_uid;
2066 /* NEWDECL contains the merged attribute lists.
2067 Update OLDDECL to be the same. */
2068 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2073 /* Record a decl-node X as belonging to the current lexical scope.
2074 Check for errors (such as an incompatible declaration for the same
2075 name already seen in the same scope).
2077 Returns either X or an old decl for the same name.
2078 If an old decl is returned, it may have been smashed
2079 to agree with what X says. */
2086 register tree name = DECL_NAME (x);
2087 register struct binding_level *b = current_binding_level;
2089 DECL_CONTEXT (x) = current_function_decl;
2090 /* A local extern declaration for a function doesn't constitute nesting.
2091 A local auto declaration does, since it's a forward decl
2092 for a nested function coming later. */
2093 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2094 && DECL_EXTERNAL (x))
2095 DECL_CONTEXT (x) = 0;
2097 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2098 && x != IDENTIFIER_IMPLICIT_DECL (name)
2099 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2100 && !DECL_IN_SYSTEM_HEADER (x))
2101 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2107 int different_binding_level = 0;
2109 t = lookup_name_current_level (name);
2110 /* Don't type check externs here when -traditional. This is so that
2111 code with conflicting declarations inside blocks will get warnings
2112 not errors. X11 for instance depends on this. */
2113 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2115 t = IDENTIFIER_GLOBAL_VALUE (name);
2116 /* Type decls at global scope don't conflict with externs declared
2117 inside lexical blocks. */
2118 if (t && TREE_CODE (t) == TYPE_DECL)
2120 different_binding_level = 1;
2122 if (t != 0 && t == error_mark_node)
2123 /* error_mark_node is 0 for a while during initialization! */
2126 error_with_decl (x, "`%s' used prior to declaration");
2131 file = DECL_SOURCE_FILE (t);
2132 line = DECL_SOURCE_LINE (t);
2135 /* If this decl is `static' and an implicit decl was seen previously,
2136 warn. But don't complain if -traditional,
2137 since traditional compilers don't complain. */
2138 if (! flag_traditional && TREE_PUBLIC (name)
2139 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2140 sets this for all functions. */
2141 && ! TREE_PUBLIC (x)
2142 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2143 /* We used to warn also for explicit extern followed by static,
2144 but sometimes you need to do it that way. */
2145 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2147 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2148 IDENTIFIER_POINTER (name));
2149 pedwarn_with_file_and_line
2150 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2151 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2152 "previous declaration of `%s'",
2153 IDENTIFIER_POINTER (name));
2154 TREE_THIS_VOLATILE (name) = 1;
2157 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2159 if (TREE_CODE (t) == PARM_DECL)
2161 /* Don't allow more than one "real" duplicate
2162 of a forward parm decl. */
2163 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2169 /* If we are processing a typedef statement, generate a whole new
2170 ..._TYPE node (which will be just an variant of the existing
2171 ..._TYPE node with identical properties) and then install the
2172 TYPE_DECL node generated to represent the typedef name as the
2173 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2175 The whole point here is to end up with a situation where each
2176 and every ..._TYPE node the compiler creates will be uniquely
2177 associated with AT MOST one node representing a typedef name.
2178 This way, even though the compiler substitutes corresponding
2179 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2180 early on, later parts of the compiler can always do the reverse
2181 translation and get back the corresponding typedef name. For
2184 typedef struct S MY_TYPE;
2187 Later parts of the compiler might only know that `object' was of
2188 type `struct S' if it were not for code just below. With this
2189 code however, later parts of the compiler see something like:
2191 struct S' == struct S
2192 typedef struct S' MY_TYPE;
2195 And they can then deduce (from the node for type struct S') that
2196 the original object declaration was:
2200 Being able to do this is important for proper support of protoize,
2201 and also for generating precise symbolic debugging information
2202 which takes full account of the programmer's (typedef) vocabulary.
2204 Obviously, we don't want to generate a duplicate ..._TYPE node if
2205 the TYPE_DECL node that we are now processing really represents a
2206 standard built-in type.
2208 Since all standard types are effectively declared at line zero
2209 in the source file, we can easily check to see if we are working
2210 on a standard type by checking the current value of lineno. */
2212 if (TREE_CODE (x) == TYPE_DECL)
2214 if (DECL_SOURCE_LINE (x) == 0)
2216 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2217 TYPE_NAME (TREE_TYPE (x)) = x;
2219 else if (TREE_TYPE (x) != error_mark_node
2220 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2222 tree tt = TREE_TYPE (x);
2223 DECL_ORIGINAL_TYPE (x) = tt;
2224 tt = build_type_copy (tt);
2230 /* Multiple external decls of the same identifier ought to match.
2231 Check against both global declarations (when traditional) and out of
2232 scope (limbo) block level declarations.
2234 We get warnings about inline functions where they are defined.
2235 Avoid duplicate warnings where they are used. */
2236 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2240 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2241 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2242 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2243 decl = IDENTIFIER_GLOBAL_VALUE (name);
2244 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2245 /* Decls in limbo are always extern, so no need to check that. */
2246 decl = IDENTIFIER_LIMBO_VALUE (name);
2250 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2251 /* If old decl is built-in, we already warned if we should. */
2252 && !DECL_BUILT_IN (decl))
2254 pedwarn_with_decl (x,
2255 "type mismatch with previous external decl");
2256 pedwarn_with_decl (decl, "previous external decl of `%s'");
2260 /* If a function has had an implicit declaration, and then is defined,
2261 make sure they are compatible. */
2263 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2264 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2265 && TREE_CODE (x) == FUNCTION_DECL
2266 && ! comptypes (TREE_TYPE (x),
2267 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2269 warning_with_decl (x, "type mismatch with previous implicit declaration");
2270 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2271 "previous implicit declaration of `%s'");
2274 /* In PCC-compatibility mode, extern decls of vars with no current decl
2275 take effect at top level no matter where they are. */
2276 if (flag_traditional && DECL_EXTERNAL (x)
2277 && lookup_name (name) == 0)
2279 tree type = TREE_TYPE (x);
2281 /* But don't do this if the type contains temporary nodes. */
2284 if (type == error_mark_node)
2286 if (! TREE_PERMANENT (type))
2288 warning_with_decl (x, "type of external `%s' is not global");
2289 /* By exiting the loop early, we leave TYPE nonzero,
2290 and thus prevent globalization of the decl. */
2293 else if (TREE_CODE (type) == FUNCTION_TYPE
2294 && TYPE_ARG_TYPES (type) != 0)
2295 /* The types might not be truly local,
2296 but the list of arg types certainly is temporary.
2297 Since prototypes are nontraditional,
2298 ok not to do the traditional thing. */
2300 type = TREE_TYPE (type);
2304 b = global_binding_level;
2307 /* This name is new in its binding level.
2308 Install the new declaration and return it. */
2309 if (b == global_binding_level)
2311 /* Install a global value. */
2313 /* If the first global decl has external linkage,
2314 warn if we later see static one. */
2315 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2316 TREE_PUBLIC (name) = 1;
2318 IDENTIFIER_GLOBAL_VALUE (name) = x;
2320 /* We no longer care about any previous block level declarations. */
2321 IDENTIFIER_LIMBO_VALUE (name) = 0;
2323 /* Don't forget if the function was used via an implicit decl. */
2324 if (IDENTIFIER_IMPLICIT_DECL (name)
2325 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2326 TREE_USED (x) = 1, TREE_USED (name) = 1;
2328 /* Don't forget if its address was taken in that way. */
2329 if (IDENTIFIER_IMPLICIT_DECL (name)
2330 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2331 TREE_ADDRESSABLE (x) = 1;
2333 /* Warn about mismatches against previous implicit decl. */
2334 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2335 /* If this real decl matches the implicit, don't complain. */
2336 && ! (TREE_CODE (x) == FUNCTION_DECL
2337 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2338 == integer_type_node)))
2339 pedwarn ("`%s' was previously implicitly declared to return `int'",
2340 IDENTIFIER_POINTER (name));
2342 /* If this decl is `static' and an `extern' was seen previously,
2343 that is erroneous. */
2344 if (TREE_PUBLIC (name)
2345 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2347 /* Okay to redeclare an ANSI built-in as static. */
2348 if (t != 0 && DECL_BUILT_IN (t))
2350 /* Okay to declare a non-ANSI built-in as anything. */
2351 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2353 /* Okay to have global type decl after an earlier extern
2354 declaration inside a lexical block. */
2355 else if (TREE_CODE (x) == TYPE_DECL)
2357 else if (IDENTIFIER_IMPLICIT_DECL (name))
2359 if (! TREE_THIS_VOLATILE (name))
2360 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2361 IDENTIFIER_POINTER (name));
2364 pedwarn ("`%s' was declared `extern' and later `static'",
2365 IDENTIFIER_POINTER (name));
2370 /* Here to install a non-global value. */
2371 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2372 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2373 IDENTIFIER_LOCAL_VALUE (name) = x;
2375 /* If this is an extern function declaration, see if we
2376 have a global definition or declaration for the function. */
2378 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2380 && TREE_CODE (x) == FUNCTION_DECL
2381 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2383 /* We have one. Their types must agree. */
2384 if (! comptypes (TREE_TYPE (x),
2385 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2386 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2389 /* Inner extern decl is inline if global one is.
2390 Copy enough to really inline it. */
2391 if (DECL_INLINE (oldglobal))
2393 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2394 DECL_INITIAL (x) = (current_function_decl == oldglobal
2395 ? 0 : DECL_INITIAL (oldglobal));
2396 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2397 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2398 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2399 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2400 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2401 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2403 /* Inner extern decl is built-in if global one is. */
2404 if (DECL_BUILT_IN (oldglobal))
2406 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2407 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2409 /* Keep the arg types from a file-scope fcn defn. */
2410 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2411 && DECL_INITIAL (oldglobal)
2412 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2413 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2417 #if 0 /* This case is probably sometimes the right thing to do. */
2418 /* If we have a local external declaration,
2419 then any file-scope declaration should not
2420 have been static. */
2421 if (oldlocal == 0 && oldglobal != 0
2422 && !TREE_PUBLIC (oldglobal)
2423 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2424 warning ("`%s' locally external but globally static",
2425 IDENTIFIER_POINTER (name));
2428 /* If we have a local external declaration,
2429 and no file-scope declaration has yet been seen,
2430 then if we later have a file-scope decl it must not be static. */
2432 && DECL_EXTERNAL (x)
2436 TREE_PUBLIC (name) = 1;
2438 /* Save this decl, so that we can do type checking against
2439 other decls after it falls out of scope.
2441 Only save it once. This prevents temporary decls created in
2442 expand_inline_function from being used here, since this
2443 will have been set when the inline function was parsed.
2444 It also helps give slightly better warnings. */
2445 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2446 IDENTIFIER_LIMBO_VALUE (name) = x;
2449 /* Warn if shadowing an argument at the top level of the body. */
2450 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2451 /* This warning doesn't apply to the parms of a nested fcn. */
2452 && ! current_binding_level->parm_flag
2453 /* Check that this is one level down from the parms. */
2454 && current_binding_level->level_chain->parm_flag
2455 /* Check that the decl being shadowed
2456 comes from the parm level, one level up. */
2457 && chain_member (oldlocal, current_binding_level->level_chain->names))
2459 if (TREE_CODE (oldlocal) == PARM_DECL)
2460 pedwarn ("declaration of `%s' shadows a parameter",
2461 IDENTIFIER_POINTER (name));
2463 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2464 IDENTIFIER_POINTER (name));
2467 /* Maybe warn if shadowing something else. */
2468 else if (warn_shadow && !DECL_EXTERNAL (x)
2469 /* No shadow warnings for internally generated vars. */
2470 && DECL_SOURCE_LINE (x) != 0
2471 /* No shadow warnings for vars made for inlining. */
2472 && ! DECL_FROM_INLINE (x))
2474 char *warnstring = 0;
2476 if (TREE_CODE (x) == PARM_DECL
2477 && current_binding_level->level_chain->parm_flag)
2478 /* Don't warn about the parm names in function declarator
2479 within a function declarator.
2480 It would be nice to avoid warning in any function
2481 declarator in a declaration, as opposed to a definition,
2482 but there is no way to tell it's not a definition. */
2484 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2485 warnstring = "declaration of `%s' shadows a parameter";
2486 else if (oldlocal != 0)
2487 warnstring = "declaration of `%s' shadows previous local";
2488 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2489 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2490 warnstring = "declaration of `%s' shadows global declaration";
2493 warning (warnstring, IDENTIFIER_POINTER (name));
2496 /* If storing a local value, there may already be one (inherited).
2497 If so, record it for restoration when this binding level ends. */
2499 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2502 /* Keep count of variables in this level with incomplete type. */
2503 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2507 /* Put decls on list in reverse order.
2508 We will reverse them later if necessary. */
2509 TREE_CHAIN (x) = b->names;
2515 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2518 pushdecl_top_level (x)
2522 register struct binding_level *b = current_binding_level;
2524 current_binding_level = global_binding_level;
2526 current_binding_level = b;
2530 /* Generate an implicit declaration for identifier FUNCTIONID
2531 as a function of type int (). Print a warning if appropriate. */
2534 implicitly_declare (functionid)
2538 int traditional_warning = 0;
2539 /* Only one "implicit declaration" warning per identifier. */
2540 int implicit_warning;
2542 /* Save the decl permanently so we can warn if definition follows. */
2543 push_obstacks_nochange ();
2544 end_temporary_allocation ();
2546 /* We used to reuse an old implicit decl here,
2547 but this loses with inline functions because it can clobber
2548 the saved decl chains. */
2549 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2550 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2552 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2554 /* Warn of implicit decl following explicit local extern decl.
2555 This is probably a program designed for traditional C. */
2556 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2557 traditional_warning = 1;
2559 /* Warn once of an implicit declaration. */
2560 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2562 DECL_EXTERNAL (decl) = 1;
2563 TREE_PUBLIC (decl) = 1;
2565 /* Record that we have an implicit decl and this is it. */
2566 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2568 /* ANSI standard says implicit declarations are in the innermost block.
2569 So we record the decl in the standard fashion.
2570 If flag_traditional is set, pushdecl does it top-level. */
2573 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2574 maybe_objc_check_decl (decl);
2576 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2578 if (mesg_implicit_function_declaration && implicit_warning)
2580 if (mesg_implicit_function_declaration == 2)
2581 error ("implicit declaration of function `%s'",
2582 IDENTIFIER_POINTER (functionid));
2584 warning ("implicit declaration of function `%s'",
2585 IDENTIFIER_POINTER (functionid));
2587 else if (warn_traditional && traditional_warning)
2588 warning ("function `%s' was previously declared within a block",
2589 IDENTIFIER_POINTER (functionid));
2591 /* Write a record describing this implicit function declaration to the
2592 prototypes file (if requested). */
2594 gen_aux_info_record (decl, 0, 1, 0);
2601 /* Return zero if the declaration NEWDECL is valid
2602 when the declaration OLDDECL (assumed to be for the same name)
2603 has already been seen.
2604 Otherwise return an error message format string with a %s
2605 where the identifier should go. */
2608 redeclaration_error_message (newdecl, olddecl)
2609 tree newdecl, olddecl;
2611 if (TREE_CODE (newdecl) == TYPE_DECL)
2613 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2615 /* pushdecl creates distinct types for TYPE_DECLs by calling
2616 build_type_copy, so the above comparison generally fails. We do
2617 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2618 is equivalent to what this code used to do before the build_type_copy
2619 call. The variant type distinction should not matter for traditional
2620 code, because it doesn't have type qualifiers. */
2621 if (flag_traditional
2622 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2624 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2626 return "redefinition of `%s'";
2628 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2630 /* Declarations of functions can insist on internal linkage
2631 but they can't be inconsistent with internal linkage,
2632 so there can be no error on that account.
2633 However defining the same name twice is no good. */
2634 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2635 /* However, defining once as extern inline and a second
2636 time in another way is ok. */
2637 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2638 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2639 return "redefinition of `%s'";
2642 else if (current_binding_level == global_binding_level)
2644 /* Objects declared at top level: */
2645 /* If at least one is a reference, it's ok. */
2646 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2648 /* Reject two definitions. */
2649 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2650 return "redefinition of `%s'";
2651 /* Now we have two tentative defs, or one tentative and one real def. */
2652 /* Insist that the linkage match. */
2653 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2654 return "conflicting declarations of `%s'";
2657 else if (current_binding_level->parm_flag
2658 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2662 /* Newdecl has block scope. If olddecl has block scope also, then
2663 reject two definitions, and reject a definition together with an
2664 external reference. Otherwise, it is OK, because newdecl must
2665 be an extern reference to olddecl. */
2666 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2667 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2668 return "redeclaration of `%s'";
2673 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2674 Create one if none exists so far for the current function.
2675 This function is called for both label definitions and label references. */
2681 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2683 if (current_function_decl == 0)
2685 error ("label %s referenced outside of any function",
2686 IDENTIFIER_POINTER (id));
2690 /* Use a label already defined or ref'd with this name. */
2693 /* But not if it is inherited and wasn't declared to be inheritable. */
2694 if (DECL_CONTEXT (decl) != current_function_decl
2695 && ! C_DECLARED_LABEL_FLAG (decl))
2696 return shadow_label (id);
2700 decl = build_decl (LABEL_DECL, id, void_type_node);
2702 /* Make sure every label has an rtx. */
2705 /* A label not explicitly declared must be local to where it's ref'd. */
2706 DECL_CONTEXT (decl) = current_function_decl;
2708 DECL_MODE (decl) = VOIDmode;
2710 /* Say where one reference is to the label,
2711 for the sake of the error if it is not defined. */
2712 DECL_SOURCE_LINE (decl) = lineno;
2713 DECL_SOURCE_FILE (decl) = input_filename;
2715 IDENTIFIER_LABEL_VALUE (id) = decl;
2717 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2722 /* Make a label named NAME in the current function,
2723 shadowing silently any that may be inherited from containing functions
2724 or containing scopes.
2726 Note that valid use, if the label being shadowed
2727 comes from another scope in the same function,
2728 requires calling declare_nonlocal_label right away. */
2734 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2740 /* Check to make sure that the label hasn't already been declared
2741 at this label scope */
2742 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2743 if (TREE_VALUE (dup) == decl)
2745 error ("duplicate label declaration `%s'",
2746 IDENTIFIER_POINTER (name));
2747 error_with_decl (TREE_VALUE (dup),
2748 "this is a previous declaration");
2749 /* Just use the previous declaration. */
2750 return lookup_label (name);
2753 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2754 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2757 return lookup_label (name);
2760 /* Define a label, specifying the location in the source file.
2761 Return the LABEL_DECL node for the label, if the definition is valid.
2762 Otherwise return 0. */
2765 define_label (filename, line, name)
2770 tree decl = lookup_label (name);
2772 /* If label with this name is known from an outer context, shadow it. */
2773 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2775 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2776 IDENTIFIER_LABEL_VALUE (name) = 0;
2777 decl = lookup_label (name);
2780 if (DECL_INITIAL (decl) != 0)
2782 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2787 /* Mark label as having been defined. */
2788 DECL_INITIAL (decl) = error_mark_node;
2789 /* Say where in the source. */
2790 DECL_SOURCE_FILE (decl) = filename;
2791 DECL_SOURCE_LINE (decl) = line;
2796 /* Return the list of declarations of the current level.
2797 Note that this list is in reverse order unless/until
2798 you nreverse it; and when you do nreverse it, you must
2799 store the result back using `storedecls' or you will lose. */
2804 return current_binding_level->names;
2807 /* Return the list of type-tags (for structs, etc) of the current level. */
2812 return current_binding_level->tags;
2815 /* Store the list of declarations of the current level.
2816 This is done for the parameter declarations of a function being defined,
2817 after they are modified in the light of any missing parameters. */
2823 current_binding_level->names = decls;
2826 /* Similarly, store the list of tags of the current level. */
2832 current_binding_level->tags = tags;
2835 /* Given NAME, an IDENTIFIER_NODE,
2836 return the structure (or union or enum) definition for that name.
2837 Searches binding levels from BINDING_LEVEL up to the global level.
2838 If THISLEVEL_ONLY is nonzero, searches only the specified context
2839 (but skips any tag-transparent contexts to find one that is
2840 meaningful for tags).
2841 CODE says which kind of type the caller wants;
2842 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2843 If the wrong kind of type is found, an error is reported. */
2846 lookup_tag (code, name, binding_level, thislevel_only)
2847 enum tree_code code;
2848 struct binding_level *binding_level;
2852 register struct binding_level *level;
2854 for (level = binding_level; level; level = level->level_chain)
2857 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2859 if (TREE_PURPOSE (tail) == name)
2861 if (TREE_CODE (TREE_VALUE (tail)) != code)
2863 /* Definition isn't the kind we were looking for. */
2864 pending_invalid_xref = name;
2865 pending_invalid_xref_file = input_filename;
2866 pending_invalid_xref_line = lineno;
2868 return TREE_VALUE (tail);
2871 if (thislevel_only && ! level->tag_transparent)
2877 /* Print an error message now
2878 for a recent invalid struct, union or enum cross reference.
2879 We don't print them immediately because they are not invalid
2880 when used in the `struct foo;' construct for shadowing. */
2883 pending_xref_error ()
2885 if (pending_invalid_xref != 0)
2886 error_with_file_and_line (pending_invalid_xref_file,
2887 pending_invalid_xref_line,
2888 "`%s' defined as wrong kind of tag",
2889 IDENTIFIER_POINTER (pending_invalid_xref));
2890 pending_invalid_xref = 0;
2893 /* Given a type, find the tag that was defined for it and return the tag name.
2894 Otherwise return 0. */
2897 lookup_tag_reverse (type)
2900 register struct binding_level *level;
2902 for (level = current_binding_level; level; level = level->level_chain)
2905 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2907 if (TREE_VALUE (tail) == type)
2908 return TREE_PURPOSE (tail);
2914 /* Look up NAME in the current binding level and its superiors
2915 in the namespace of variables, functions and typedefs.
2916 Return a ..._DECL node of some kind representing its definition,
2917 or return 0 if it is undefined. */
2924 if (current_binding_level != global_binding_level
2925 && IDENTIFIER_LOCAL_VALUE (name))
2926 val = IDENTIFIER_LOCAL_VALUE (name);
2928 val = IDENTIFIER_GLOBAL_VALUE (name);
2932 /* Similar to `lookup_name' but look only at current binding level. */
2935 lookup_name_current_level (name)
2940 if (current_binding_level == global_binding_level)
2941 return IDENTIFIER_GLOBAL_VALUE (name);
2943 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2946 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2947 if (DECL_NAME (t) == name)
2953 /* Create the predefined scalar types of C,
2954 and some nodes representing standard constants (0, 1, (void *) 0).
2955 Initialize the global binding level.
2956 Make definitions for built-in primitive functions. */
2959 init_decl_processing ()
2961 register tree endlink;
2962 /* Either char* or void*. */
2963 tree traditional_ptr_type_node;
2964 /* Data types of memcpy and strlen. */
2965 tree memcpy_ftype, memset_ftype, strlen_ftype;
2966 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2967 int wchar_type_size;
2969 tree array_domain_type;
2971 current_function_decl = NULL;
2972 named_labels = NULL;
2973 current_binding_level = NULL_BINDING_LEVEL;
2974 free_binding_level = NULL_BINDING_LEVEL;
2975 pushlevel (0); /* make the binding_level structure for global names */
2976 global_binding_level = current_binding_level;
2978 /* Define `int' and `char' first so that dbx will output them first. */
2980 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2981 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2982 integer_type_node));
2984 /* Define `char', which is like either `signed char' or `unsigned char'
2985 but not the same as either. */
2989 ? make_signed_type (CHAR_TYPE_SIZE)
2990 : make_unsigned_type (CHAR_TYPE_SIZE));
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2994 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2995 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2996 long_integer_type_node));
2998 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2999 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
3000 unsigned_type_node));
3002 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
3003 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3004 long_unsigned_type_node));
3006 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
3007 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3008 long_long_integer_type_node));
3010 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
3011 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3012 long_long_unsigned_type_node));
3014 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
3015 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3016 short_integer_type_node));
3018 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
3019 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3020 short_unsigned_type_node));
3022 /* `unsigned long' is the standard type for sizeof.
3023 Traditionally, use a signed type.
3024 Note that stddef.h uses `unsigned long',
3025 and this must agree, even if long and int are the same size. */
3027 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3028 if (flag_traditional && TREE_UNSIGNED (sizetype))
3029 set_sizetype (signed_type (sizetype));
3032 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3034 error_mark_node = make_node (ERROR_MARK);
3035 TREE_TYPE (error_mark_node) = error_mark_node;
3037 /* Define both `signed char' and `unsigned char'. */
3038 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3039 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3040 signed_char_type_node));
3042 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3043 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3044 unsigned_char_type_node));
3046 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3047 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3049 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3050 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3052 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3053 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3055 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3056 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3058 #if HOST_BITS_PER_WIDE_INT >= 64
3059 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3060 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3063 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3064 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3066 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3067 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3069 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3070 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3072 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3073 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3075 #if HOST_BITS_PER_WIDE_INT >= 64
3076 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3077 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3080 float_type_node = make_node (REAL_TYPE);
3081 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3082 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3084 layout_type (float_type_node);
3086 double_type_node = make_node (REAL_TYPE);
3087 if (flag_short_double)
3088 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3090 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3091 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3093 layout_type (double_type_node);
3095 long_double_type_node = make_node (REAL_TYPE);
3096 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3097 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3098 long_double_type_node));
3099 layout_type (long_double_type_node);
3101 complex_integer_type_node = make_node (COMPLEX_TYPE);
3102 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3103 complex_integer_type_node));
3104 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3105 layout_type (complex_integer_type_node);
3107 complex_float_type_node = make_node (COMPLEX_TYPE);
3108 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3109 complex_float_type_node));
3110 TREE_TYPE (complex_float_type_node) = float_type_node;
3111 layout_type (complex_float_type_node);
3113 complex_double_type_node = make_node (COMPLEX_TYPE);
3114 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3115 complex_double_type_node));
3116 TREE_TYPE (complex_double_type_node) = double_type_node;
3117 layout_type (complex_double_type_node);
3119 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3120 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3121 complex_long_double_type_node));
3122 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3123 layout_type (complex_long_double_type_node);
3126 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3127 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3128 signed_wchar_type_node = signed_type (wchar_type_node);
3129 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3131 integer_zero_node = build_int_2 (0, 0);
3132 TREE_TYPE (integer_zero_node) = integer_type_node;
3133 integer_one_node = build_int_2 (1, 0);
3134 TREE_TYPE (integer_one_node) = integer_type_node;
3136 boolean_type_node = integer_type_node;
3137 boolean_true_node = integer_one_node;
3138 boolean_false_node = integer_zero_node;
3140 size_zero_node = build_int_2 (0, 0);
3141 TREE_TYPE (size_zero_node) = sizetype;
3142 size_one_node = build_int_2 (1, 0);
3143 TREE_TYPE (size_one_node) = sizetype;
3145 void_type_node = make_node (VOID_TYPE);
3146 pushdecl (build_decl (TYPE_DECL,
3147 ridpointers[(int) RID_VOID], void_type_node));
3148 layout_type (void_type_node); /* Uses integer_zero_node */
3149 /* We are not going to have real types in C with less than byte alignment,
3150 so we might as well not have any types that claim to have it. */
3151 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3153 null_pointer_node = build_int_2 (0, 0);
3154 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3155 layout_type (TREE_TYPE (null_pointer_node));
3157 string_type_node = build_pointer_type (char_type_node);
3158 const_string_type_node
3159 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3161 /* Make a type to be the domain of a few array types
3162 whose domains don't really matter.
3163 200 is small enough that it always fits in size_t
3164 and large enough that it can hold most function names for the
3165 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3166 array_domain_type = build_index_type (build_int_2 (200, 0));
3168 /* make a type for arrays of characters.
3169 With luck nothing will ever really depend on the length of this
3171 char_array_type_node
3172 = build_array_type (char_type_node, array_domain_type);
3173 /* Likewise for arrays of ints. */
3175 = build_array_type (integer_type_node, array_domain_type);
3176 /* This is for wide string constants. */
3177 wchar_array_type_node
3178 = build_array_type (wchar_type_node, array_domain_type);
3180 default_function_type
3181 = build_function_type (integer_type_node, NULL_TREE);
3183 ptr_type_node = build_pointer_type (void_type_node);
3185 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3187 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3190 = build_function_type (void_type_node, NULL_TREE);
3193 = build_function_type (float_type_node,
3194 tree_cons (NULL_TREE, float_type_node, endlink));
3197 = build_function_type (double_type_node,
3198 tree_cons (NULL_TREE, double_type_node, endlink));
3200 ldouble_ftype_ldouble
3201 = build_function_type (long_double_type_node,
3202 tree_cons (NULL_TREE, long_double_type_node,
3205 double_ftype_double_double
3206 = build_function_type (double_type_node,
3207 tree_cons (NULL_TREE, double_type_node,
3208 tree_cons (NULL_TREE,
3209 double_type_node, endlink)));
3212 = build_function_type (integer_type_node,
3213 tree_cons (NULL_TREE, integer_type_node, endlink));
3216 = build_function_type (long_integer_type_node,
3217 tree_cons (NULL_TREE,
3218 long_integer_type_node, endlink));
3220 void_ftype_ptr_ptr_int
3221 = build_function_type (void_type_node,
3222 tree_cons (NULL_TREE, ptr_type_node,
3223 tree_cons (NULL_TREE, ptr_type_node,
3224 tree_cons (NULL_TREE,
3228 int_ftype_cptr_cptr_sizet
3229 = build_function_type (integer_type_node,
3230 tree_cons (NULL_TREE, const_ptr_type_node,
3231 tree_cons (NULL_TREE, const_ptr_type_node,
3232 tree_cons (NULL_TREE,
3236 void_ftype_ptr_int_int
3237 = build_function_type (void_type_node,
3238 tree_cons (NULL_TREE, ptr_type_node,
3239 tree_cons (NULL_TREE, integer_type_node,
3240 tree_cons (NULL_TREE,
3244 string_ftype_ptr_ptr /* strcpy prototype */
3245 = build_function_type (string_type_node,
3246 tree_cons (NULL_TREE, string_type_node,
3247 tree_cons (NULL_TREE,
3248 const_string_type_node,
3251 int_ftype_string_string /* strcmp prototype */
3252 = build_function_type (integer_type_node,
3253 tree_cons (NULL_TREE, const_string_type_node,
3254 tree_cons (NULL_TREE,
3255 const_string_type_node,
3258 strlen_ftype /* strlen prototype */
3259 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3260 tree_cons (NULL_TREE, const_string_type_node,
3263 traditional_ptr_type_node
3264 = (flag_traditional ? string_type_node : ptr_type_node);
3266 memcpy_ftype /* memcpy prototype */
3267 = build_function_type (traditional_ptr_type_node,
3268 tree_cons (NULL_TREE, ptr_type_node,
3269 tree_cons (NULL_TREE, const_ptr_type_node,
3270 tree_cons (NULL_TREE,
3274 memset_ftype /* memset prototype */
3275 = build_function_type (traditional_ptr_type_node,
3276 tree_cons (NULL_TREE, ptr_type_node,
3277 tree_cons (NULL_TREE, integer_type_node,
3278 tree_cons (NULL_TREE,
3282 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3284 = build_function_type (ptr_type_node,
3285 tree_cons (NULL_TREE, ptr_type_node, endlink));
3287 builtin_function ("__builtin_constant_p", default_function_type,
3288 BUILT_IN_CONSTANT_P, NULL_PTR);
3290 builtin_function ("__builtin_return_address",
3291 build_function_type (ptr_type_node,
3292 tree_cons (NULL_TREE,
3295 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3297 builtin_function ("__builtin_frame_address",
3298 build_function_type (ptr_type_node,
3299 tree_cons (NULL_TREE,
3302 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3304 builtin_function ("__builtin_aggregate_incoming_address",
3305 build_function_type (ptr_type_node, NULL_TREE),
3306 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3308 /* Hooks for the DWARF 2 __throw routine. */
3309 builtin_function ("__builtin_unwind_init",
3310 build_function_type (void_type_node, endlink),
3311 BUILT_IN_UNWIND_INIT, NULL_PTR);
3312 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3313 BUILT_IN_DWARF_CFA, NULL_PTR);
3314 builtin_function ("__builtin_dwarf_fp_regnum",
3315 build_function_type (unsigned_type_node, endlink),
3316 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3317 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3318 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3319 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3320 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3321 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3322 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3324 ("__builtin_eh_return",
3325 build_function_type (void_type_node,
3326 tree_cons (NULL_TREE, ptr_type_node,
3327 tree_cons (NULL_TREE,
3328 type_for_mode (ptr_mode, 0),
3329 tree_cons (NULL_TREE,
3332 BUILT_IN_EH_RETURN, NULL_PTR);
3334 builtin_function ("__builtin_alloca",
3335 build_function_type (ptr_type_node,
3336 tree_cons (NULL_TREE,
3339 BUILT_IN_ALLOCA, "alloca");
3340 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3341 /* Define alloca, ffs as builtins.
3342 Declare _exit just to mark it as volatile. */
3343 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3345 temp = builtin_function ("alloca",
3346 build_function_type (ptr_type_node,
3347 tree_cons (NULL_TREE,
3350 BUILT_IN_ALLOCA, NULL_PTR);
3351 /* Suppress error if redefined as a non-function. */
3352 DECL_BUILT_IN_NONANSI (temp) = 1;
3353 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3354 /* Suppress error if redefined as a non-function. */
3355 DECL_BUILT_IN_NONANSI (temp) = 1;
3356 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3358 TREE_THIS_VOLATILE (temp) = 1;
3359 TREE_SIDE_EFFECTS (temp) = 1;
3360 /* Suppress error if redefined as a non-function. */
3361 DECL_BUILT_IN_NONANSI (temp) = 1;
3364 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3365 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3367 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3369 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3371 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3373 builtin_function ("__builtin_saveregs",
3374 build_function_type (ptr_type_node, NULL_TREE),
3375 BUILT_IN_SAVEREGS, NULL_PTR);
3376 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3378 builtin_function ("__builtin_varargs",
3379 build_function_type (ptr_type_node,
3380 tree_cons (NULL_TREE,
3383 BUILT_IN_VARARGS, NULL_PTR);
3385 builtin_function ("__builtin_classify_type", default_function_type,
3386 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3387 builtin_function ("__builtin_next_arg",
3388 build_function_type (ptr_type_node, NULL_TREE),
3389 BUILT_IN_NEXT_ARG, NULL_PTR);
3390 builtin_function ("__builtin_args_info",
3391 build_function_type (integer_type_node,
3392 tree_cons (NULL_TREE,
3395 BUILT_IN_ARGS_INFO, NULL_PTR);
3397 /* Untyped call and return. */
3398 builtin_function ("__builtin_apply_args",
3399 build_function_type (ptr_type_node, NULL_TREE),
3400 BUILT_IN_APPLY_ARGS, NULL_PTR);
3402 temp = tree_cons (NULL_TREE,
3403 build_pointer_type (build_function_type (void_type_node,
3405 tree_cons (NULL_TREE,
3407 tree_cons (NULL_TREE,
3410 builtin_function ("__builtin_apply",
3411 build_function_type (ptr_type_node, temp),
3412 BUILT_IN_APPLY, NULL_PTR);
3413 builtin_function ("__builtin_return",
3414 build_function_type (void_type_node,
3415 tree_cons (NULL_TREE,
3418 BUILT_IN_RETURN, NULL_PTR);
3420 /* Currently under experimentation. */
3421 builtin_function ("__builtin_memcpy", memcpy_ftype,
3422 BUILT_IN_MEMCPY, "memcpy");
3423 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3424 BUILT_IN_MEMCMP, "memcmp");
3425 builtin_function ("__builtin_memset", memset_ftype,
3426 BUILT_IN_MEMSET, "memset");
3427 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3428 BUILT_IN_STRCMP, "strcmp");
3429 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3430 BUILT_IN_STRCPY, "strcpy");
3431 builtin_function ("__builtin_strlen", strlen_ftype,
3432 BUILT_IN_STRLEN, "strlen");
3433 builtin_function ("__builtin_sqrtf", float_ftype_float,
3434 BUILT_IN_FSQRT, "sqrtf");
3435 builtin_function ("__builtin_fsqrt", double_ftype_double,
3436 BUILT_IN_FSQRT, "sqrt");
3437 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3438 BUILT_IN_FSQRT, "sqrtl");
3439 builtin_function ("__builtin_sinf", float_ftype_float,
3440 BUILT_IN_SIN, "sinf");
3441 builtin_function ("__builtin_sin", double_ftype_double,
3442 BUILT_IN_SIN, "sin");
3443 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3444 BUILT_IN_SIN, "sinl");
3445 builtin_function ("__builtin_cosf", float_ftype_float,
3446 BUILT_IN_COS, "cosf");
3447 builtin_function ("__builtin_cos", double_ftype_double,
3448 BUILT_IN_COS, "cos");
3449 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3450 BUILT_IN_COS, "cosl");
3451 builtin_function ("__builtin_setjmp",
3452 build_function_type (integer_type_node,
3453 tree_cons (NULL_TREE,
3454 ptr_type_node, endlink)),
3455 BUILT_IN_SETJMP, NULL_PTR);
3456 builtin_function ("__builtin_longjmp",
3459 tree_cons (NULL, ptr_type_node,
3460 tree_cons (NULL_TREE,
3463 BUILT_IN_LONGJMP, NULL_PTR);
3464 builtin_function ("__builtin_trap",
3465 build_function_type (void_type_node, endlink),
3466 BUILT_IN_TRAP, NULL_PTR);
3468 /* In an ANSI C program, it is okay to supply built-in meanings
3469 for these functions, since applications cannot validly use them
3470 with any other meaning.
3471 However, honor the -fno-builtin option. */
3472 if (!flag_no_builtin)
3474 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3475 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3476 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3477 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3479 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3480 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3481 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3483 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3484 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3486 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3488 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3489 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3490 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3491 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3493 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3494 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3495 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3496 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3497 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3498 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3500 /* Declare these functions volatile
3501 to avoid spurious "control drops through" warnings. */
3502 /* Don't specify the argument types, to avoid errors
3503 from certain code which isn't valid in ANSI but which exists. */
3504 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3506 TREE_THIS_VOLATILE (temp) = 1;
3507 TREE_SIDE_EFFECTS (temp) = 1;
3508 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3509 TREE_THIS_VOLATILE (temp) = 1;
3510 TREE_SIDE_EFFECTS (temp) = 1;
3514 /* Support for these has not been written in either expand_builtin
3515 or build_function_call. */
3516 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3517 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3518 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3520 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3522 builtin_function ("__builtin_fmod", double_ftype_double_double,
3523 BUILT_IN_FMOD, NULL_PTR);
3524 builtin_function ("__builtin_frem", double_ftype_double_double,
3525 BUILT_IN_FREM, NULL_PTR);
3526 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3528 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3532 pedantic_lvalues = pedantic;
3534 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3535 declare_function_name ();
3537 start_identifier_warnings ();
3539 /* Prepare to check format strings against argument lists. */
3540 init_function_format_info ();
3544 incomplete_decl_finalize_hook = finish_incomplete_decl;
3546 lang_get_alias_set = c_get_alias_set;
3549 /* Return a definition for a builtin function named NAME and whose data type
3550 is TYPE. TYPE should be a function type with argument types.
3551 FUNCTION_CODE tells later passes how to compile calls to this function.
3552 See tree.h for its possible values.
3554 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3555 the name to be called if we can't opencode the function. */
3558 builtin_function (name, type, function_code, library_name)
3561 enum built_in_function function_code;
3564 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3565 DECL_EXTERNAL (decl) = 1;
3566 TREE_PUBLIC (decl) = 1;
3567 /* If -traditional, permit redefining a builtin function any way you like.
3568 (Though really, if the program redefines these functions,
3569 it probably won't work right unless compiled with -fno-builtin.) */
3570 if (flag_traditional && name[0] != '_')
3571 DECL_BUILT_IN_NONANSI (decl) = 1;
3573 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3574 make_decl_rtl (decl, NULL_PTR, 1);
3576 if (function_code != NOT_BUILT_IN)
3578 DECL_BUILT_IN (decl) = 1;
3579 DECL_FUNCTION_CODE (decl) = function_code;
3581 /* Warn if a function in the namespace for users
3582 is used without an occasion to consider it declared. */
3583 if (name[0] != '_' || name[1] != '_')
3584 C_DECL_ANTICIPATED (decl) = 1;
3589 /* Called when a declaration is seen that contains no names to declare.
3590 If its type is a reference to a structure, union or enum inherited
3591 from a containing scope, shadow that tag name for the current scope
3592 with a forward reference.
3593 If its type defines a new named structure or union
3594 or defines an enum, it is valid but we need not do anything here.
3595 Otherwise, it is an error. */
3598 shadow_tag (declspecs)
3601 shadow_tag_warned (declspecs, 0);
3605 shadow_tag_warned (declspecs, warned)
3608 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3615 pending_invalid_xref = 0;
3617 /* Remove the attributes from declspecs, since they will confuse the
3619 split_specs_attrs (declspecs, &specs, &attrs);
3621 for (link = specs; link; link = TREE_CHAIN (link))
3623 register tree value = TREE_VALUE (link);
3624 register enum tree_code code = TREE_CODE (value);
3626 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3627 /* Used to test also that TYPE_SIZE (value) != 0.
3628 That caused warning for `struct foo;' at top level in the file. */
3630 register tree name = lookup_tag_reverse (value);
3637 if (warned != 1 && code != ENUMERAL_TYPE)
3638 /* Empty unnamed enum OK */
3640 pedwarn ("unnamed struct/union that defines no instances");
3646 t = lookup_tag (code, name, current_binding_level, 1);
3650 t = make_node (code);
3657 if (!warned && ! in_system_header)
3659 warning ("useless keyword or type name in empty declaration");
3666 error ("two types specified in one empty declaration");
3671 pedwarn ("empty declaration");
3675 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3678 groktypename (typename)
3681 if (TREE_CODE (typename) != TREE_LIST)
3683 return grokdeclarator (TREE_VALUE (typename),
3684 TREE_PURPOSE (typename),
3688 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3691 groktypename_in_parm_context (typename)
3694 if (TREE_CODE (typename) != TREE_LIST)
3696 return grokdeclarator (TREE_VALUE (typename),
3697 TREE_PURPOSE (typename),
3701 /* Decode a declarator in an ordinary declaration or data definition.
3702 This is called as soon as the type information and variable name
3703 have been parsed, before parsing the initializer if any.
3704 Here we create the ..._DECL node, fill in its type,
3705 and put it on the list of decls for the current context.
3706 The ..._DECL node is returned as the value.
3708 Exception: for arrays where the length is not specified,
3709 the type is left null, to be filled in by `finish_decl'.
3711 Function definitions do not come here; they go to start_function
3712 instead. However, external and forward declarations of functions
3713 do go through here. Structure field declarations are done by
3714 grokfield and not through here. */
3716 /* Set this to zero to debug not using the temporary obstack
3717 to parse initializers. */
3718 int debug_temp_inits = 1;
3721 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3722 tree declarator, declspecs;
3724 tree attributes, prefix_attributes;
3726 register tree decl = grokdeclarator (declarator, declspecs,
3727 NORMAL, initialized);
3729 int init_written = initialized;
3731 /* The corresponding pop_obstacks is in finish_decl. */
3732 push_obstacks_nochange ();
3734 if (warn_main && TREE_CODE (decl) != FUNCTION_DECL
3735 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3736 warning_with_decl (decl, "`%s' is usually a function");
3739 /* Is it valid for this decl to have an initializer at all?
3740 If not, set INITIALIZED to zero, which will indirectly
3741 tell `finish_decl' to ignore the initializer once it is parsed. */
3742 switch (TREE_CODE (decl))
3745 /* typedef foo = bar means give foo the same type as bar.
3746 We haven't parsed bar yet, so `finish_decl' will fix that up.
3747 Any other case of an initialization in a TYPE_DECL is an error. */
3748 if (pedantic || list_length (declspecs) > 1)
3750 error ("typedef `%s' is initialized",
3751 IDENTIFIER_POINTER (DECL_NAME (decl)));
3757 error ("function `%s' is initialized like a variable",
3758 IDENTIFIER_POINTER (DECL_NAME (decl)));
3763 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3764 error ("parameter `%s' is initialized",
3765 IDENTIFIER_POINTER (DECL_NAME (decl)));
3770 /* Don't allow initializations for incomplete types
3771 except for arrays which might be completed by the initialization. */
3772 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3774 /* A complete type is ok if size is fixed. */
3776 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3777 || C_DECL_VARIABLE_SIZE (decl))
3779 error ("variable-sized object may not be initialized");
3783 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3785 error ("variable `%s' has initializer but incomplete type",
3786 IDENTIFIER_POINTER (DECL_NAME (decl)));
3789 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3791 error ("elements of array `%s' have incomplete type",
3792 IDENTIFIER_POINTER (DECL_NAME (decl)));
3799 #if 0 /* Seems redundant with grokdeclarator. */
3800 if (current_binding_level != global_binding_level
3801 && DECL_EXTERNAL (decl)
3802 && TREE_CODE (decl) != FUNCTION_DECL)
3803 warning ("declaration of `%s' has `extern' and is initialized",
3804 IDENTIFIER_POINTER (DECL_NAME (decl)));
3806 DECL_EXTERNAL (decl) = 0;
3807 if (current_binding_level == global_binding_level)
3808 TREE_STATIC (decl) = 1;
3810 /* Tell `pushdecl' this is an initialized decl
3811 even though we don't yet have the initializer expression.
3812 Also tell `finish_decl' it may store the real initializer. */
3813 DECL_INITIAL (decl) = error_mark_node;
3816 /* If this is a function declaration, write a record describing it to the
3817 prototypes file (if requested). */
3819 if (TREE_CODE (decl) == FUNCTION_DECL)
3820 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3822 /* ANSI specifies that a tentative definition which is not merged with
3823 a non-tentative definition behaves exactly like a definition with an
3824 initializer equal to zero. (Section 3.7.2)
3825 -fno-common gives strict ANSI behavior. Usually you don't want it.
3826 This matters only for variables with external linkage. */
3827 if (! flag_no_common || ! TREE_PUBLIC (decl))
3828 DECL_COMMON (decl) = 1;
3830 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3831 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3834 /* Set attributes here so if duplicate decl, will have proper attributes. */
3835 decl_attributes (decl, attributes, prefix_attributes);
3837 /* Add this decl to the current binding level.
3838 TEM may equal DECL or it may be a previous decl of the same name. */
3839 tem = pushdecl (decl);
3841 /* For a local variable, define the RTL now. */
3842 if (current_binding_level != global_binding_level
3843 /* But not if this is a duplicate decl
3844 and we preserved the rtl from the previous one
3845 (which may or may not happen). */
3846 && DECL_RTL (tem) == 0)
3848 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3850 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3851 && DECL_INITIAL (tem) != 0)
3857 /* When parsing and digesting the initializer,
3858 use temporary storage. Do this even if we will ignore the value. */
3859 if (current_binding_level == global_binding_level && debug_temp_inits)
3860 temporary_allocation ();
3866 /* Finish processing of a declaration;
3867 install its initial value.
3868 If the length of an array type is not known before,
3869 it must be determined now, from the initial value, or it is an error. */
3872 finish_decl (decl, init, asmspec_tree)
3876 register tree type = TREE_TYPE (decl);
3877 int was_incomplete = (DECL_SIZE (decl) == 0);
3878 int temporary = allocation_temporary_p ();
3881 /* If a name was specified, get the string. */
3883 asmspec = TREE_STRING_POINTER (asmspec_tree);
3885 /* If `start_decl' didn't like having an initialization, ignore it now. */
3887 if (init != 0 && DECL_INITIAL (decl) == 0)
3889 /* Don't crash if parm is initialized. */
3890 if (TREE_CODE (decl) == PARM_DECL)
3893 if (ITERATOR_P (decl))
3896 error_with_decl (decl, "iterator has no initial value");
3898 init = save_expr (init);
3903 if (TREE_CODE (decl) != TYPE_DECL)
3904 store_init_value (decl, init);
3907 /* typedef foo = bar; store the type of bar as the type of foo. */
3908 TREE_TYPE (decl) = TREE_TYPE (init);
3909 DECL_INITIAL (decl) = init = 0;
3913 /* Pop back to the obstack that is current for this binding level.
3914 This is because MAXINDEX, rtl, etc. to be made below
3915 must go in the permanent obstack. But don't discard the
3916 temporary data yet. */
3918 #if 0 /* pop_obstacks was near the end; this is what was here. */
3919 if (current_binding_level == global_binding_level && temporary)
3920 end_temporary_allocation ();
3923 /* Deduce size of array from initialization, if not already known */
3925 if (TREE_CODE (type) == ARRAY_TYPE
3926 && TYPE_DOMAIN (type) == 0
3927 && TREE_CODE (decl) != TYPE_DECL)
3930 = (TREE_STATIC (decl)
3931 /* Even if pedantic, an external linkage array
3932 may have incomplete type at first. */
3933 ? pedantic && !TREE_PUBLIC (decl)
3934 : !DECL_EXTERNAL (decl));
3936 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3938 /* Get the completed type made by complete_array_type. */
3939 type = TREE_TYPE (decl);
3942 error_with_decl (decl, "initializer fails to determine size of `%s'");
3947 error_with_decl (decl, "array size missing in `%s'");
3948 /* If a `static' var's size isn't known,
3949 make it extern as well as static, so it does not get
3951 If it is not `static', then do not mark extern;
3952 finish_incomplete_decl will give it a default size
3953 and it will get allocated. */
3954 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3955 DECL_EXTERNAL (decl) = 1;
3958 /* TYPE_MAX_VALUE is always one less than the number of elements
3959 in the array, because we start counting at zero. Therefore,
3960 warn only if the value is less than zero. */
3961 if (pedantic && TYPE_DOMAIN (type) != 0
3962 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3963 error_with_decl (decl, "zero or negative size array `%s'");
3965 layout_decl (decl, 0);
3968 if (TREE_CODE (decl) == VAR_DECL)
3970 if (DECL_SIZE (decl) == 0
3971 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3972 layout_decl (decl, 0);
3974 if (DECL_SIZE (decl) == 0
3975 && (TREE_STATIC (decl)
3977 /* A static variable with an incomplete type
3978 is an error if it is initialized.
3979 Also if it is not file scope.
3980 Otherwise, let it through, but if it is not `extern'
3981 then it may cause an error message later. */
3982 /* A duplicate_decls call could have changed an extern
3983 declaration into a file scope one. This can be detected
3984 by TREE_ASM_WRITTEN being set. */
3985 (DECL_INITIAL (decl) != 0
3986 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3988 /* An automatic variable with an incomplete type
3990 !DECL_EXTERNAL (decl)))
3992 error_with_decl (decl, "storage size of `%s' isn't known");
3993 TREE_TYPE (decl) = error_mark_node;
3996 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3997 && DECL_SIZE (decl) != 0)
3999 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4000 constant_expression_warning (DECL_SIZE (decl));
4002 error_with_decl (decl, "storage size of `%s' isn't constant");
4005 if (TREE_USED (type))
4006 TREE_USED (decl) = 1;
4009 /* If this is a function and an assembler name is specified, it isn't
4010 builtin any more. Also reset DECL_RTL so we can give it its new
4012 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4014 DECL_BUILT_IN (decl) = 0;
4015 DECL_RTL (decl) = 0;
4018 /* Output the assembler code and/or RTL code for variables and functions,
4019 unless the type is an undefined structure or union.
4020 If not, it will get done when the type is completed. */
4022 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4024 if ((flag_traditional || TREE_PERMANENT (decl))
4025 && allocation_temporary_p ())
4027 push_obstacks_nochange ();
4028 end_temporary_allocation ();
4029 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4030 maybe_objc_check_decl (decl);
4031 rest_of_decl_compilation (decl, asmspec,
4032 (DECL_CONTEXT (decl) == 0
4033 || TREE_ASM_WRITTEN (decl)),
4039 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4040 maybe_objc_check_decl (decl);
4041 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4044 if (DECL_CONTEXT (decl) != 0)
4046 /* Recompute the RTL of a local array now
4047 if it used to be an incomplete type. */
4049 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4051 /* If we used it already as memory, it must stay in memory. */
4052 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4053 /* If it's still incomplete now, no init will save it. */
4054 if (DECL_SIZE (decl) == 0)
4055 DECL_INITIAL (decl) = 0;
4058 /* Compute and store the initial value. */
4059 if (TREE_CODE (decl) != FUNCTION_DECL)
4060 expand_decl_init (decl);
4064 if (TREE_CODE (decl) == TYPE_DECL)
4066 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4067 maybe_objc_check_decl (decl);
4068 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4072 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4073 /* This test used to include TREE_PERMANENT, however, we have the same
4074 problem with initializers at the function level. Such initializers get
4075 saved until the end of the function on the momentary_obstack. */
4076 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4078 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4079 space with DECL_ARG_TYPE. */
4080 && TREE_CODE (decl) != PARM_DECL)
4082 /* We need to remember that this array HAD an initialization,
4083 but discard the actual temporary nodes,
4084 since we can't have a permanent node keep pointing to them. */
4085 /* We make an exception for inline functions, since it's
4086 normal for a local extern redeclaration of an inline function
4087 to have a copy of the top-level decl's DECL_INLINE. */
4088 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4090 /* If this is a const variable, then preserve the
4091 initializer instead of discarding it so that we can optimize
4092 references to it. */
4093 /* This test used to include TREE_STATIC, but this won't be set
4094 for function level initializers. */
4095 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4097 preserve_initializer ();
4098 /* Hack? Set the permanent bit for something that is permanent,
4099 but not on the permanent obstack, so as to convince
4100 output_constant_def to make its rtl on the permanent
4102 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4104 /* The initializer and DECL must have the same (or equivalent
4105 types), but if the initializer is a STRING_CST, its type
4106 might not be on the right obstack, so copy the type
4108 TREE_TYPE (DECL_INITIAL (decl)) = type;
4111 DECL_INITIAL (decl) = error_mark_node;
4115 /* If requested, warn about definitions of large data objects. */
4117 if (warn_larger_than
4118 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4119 && !DECL_EXTERNAL (decl))
4121 register tree decl_size = DECL_SIZE (decl);
4123 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4125 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4127 if (units > larger_than_size)
4128 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4133 /* Resume permanent allocation, if not within a function. */
4134 /* The corresponding push_obstacks_nochange is in start_decl,
4135 and in push_parm_decl and in grokfield. */
4139 /* If we have gone back from temporary to permanent allocation,
4140 actually free the temporary space that we no longer need. */
4141 if (temporary && !allocation_temporary_p ())
4142 permanent_allocation (0);
4144 /* At the end of a declaration, throw away any variable type sizes
4145 of types defined inside that declaration. There is no use
4146 computing them in the following function definition. */
4147 if (current_binding_level == global_binding_level)
4148 get_pending_sizes ();
4151 /* If DECL has a cleanup, build and return that cleanup here.
4152 This is a callback called by expand_expr. */
4155 maybe_build_cleanup (decl)
4156 tree decl ATTRIBUTE_UNUSED;
4158 /* There are no cleanups in C. */
4162 /* Given a parsed parameter declaration,
4163 decode it into a PARM_DECL and push that on the current binding level.
4164 Also, for the sake of forward parm decls,
4165 record the given order of parms in `parm_order'. */
4168 push_parm_decl (parm)
4172 int old_immediate_size_expand = immediate_size_expand;
4173 /* Don't try computing parm sizes now -- wait till fn is called. */
4174 immediate_size_expand = 0;
4176 /* The corresponding pop_obstacks is in finish_decl. */
4177 push_obstacks_nochange ();
4179 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4180 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4181 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4182 TREE_PURPOSE (TREE_VALUE (parm)));
4185 if (DECL_NAME (decl))
4188 olddecl = lookup_name (DECL_NAME (decl));
4189 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4190 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4194 decl = pushdecl (decl);
4196 immediate_size_expand = old_immediate_size_expand;
4198 current_binding_level->parm_order
4199 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4201 /* Add this decl to the current binding level. */
4202 finish_decl (decl, NULL_TREE, NULL_TREE);
4205 /* Clear the given order of parms in `parm_order'.
4206 Used at start of parm list,
4207 and also at semicolon terminating forward decls. */
4212 current_binding_level->parm_order = NULL_TREE;
4215 /* Make TYPE a complete type based on INITIAL_VALUE.
4216 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4217 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4220 complete_array_type (type, initial_value, do_default)
4225 register tree maxindex = NULL_TREE;
4230 /* Note MAXINDEX is really the maximum index,
4231 one less than the size. */
4232 if (TREE_CODE (initial_value) == STRING_CST)
4235 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4236 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4239 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4241 tree elts = CONSTRUCTOR_ELTS (initial_value);
4242 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4243 for (; elts; elts = TREE_CHAIN (elts))
4245 if (TREE_PURPOSE (elts))
4246 maxindex = TREE_PURPOSE (elts);
4248 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4250 maxindex = copy_node (maxindex);
4254 /* Make an error message unless that happened already. */
4255 if (initial_value != error_mark_node)
4258 /* Prevent further error messages. */
4259 maxindex = build_int_2 (0, 0);
4266 maxindex = build_int_2 (0, 0);
4272 TYPE_DOMAIN (type) = build_index_type (maxindex);
4273 if (!TREE_TYPE (maxindex))
4274 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4277 /* Lay out the type now that we can get the real answer. */
4284 /* Given declspecs and a declarator,
4285 determine the name and type of the object declared
4286 and construct a ..._DECL node for it.
4287 (In one case we can return a ..._TYPE node instead.
4288 For invalid input we sometimes return 0.)
4290 DECLSPECS is a chain of tree_list nodes whose value fields
4291 are the storage classes and type specifiers.
4293 DECL_CONTEXT says which syntactic context this declaration is in:
4294 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4295 FUNCDEF for a function definition. Like NORMAL but a few different
4296 error messages in each case. Return value may be zero meaning
4297 this definition is too screwy to try to parse.
4298 PARM for a parameter declaration (either within a function prototype
4299 or before a function body). Make a PARM_DECL, or return void_type_node.
4300 TYPENAME if for a typename (in a cast or sizeof).
4301 Don't make a DECL node; just return the ..._TYPE node.
4302 FIELD for a struct or union field; make a FIELD_DECL.
4303 BITFIELD for a field with specified width.
4304 INITIALIZED is 1 if the decl has an initializer.
4306 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4307 It may also be so in the PARM case, for a prototype where the
4308 argument type is specified but not the name.
4310 This function is where the complicated C meanings of `static'
4311 and `extern' are interpreted. */
4314 grokdeclarator (declarator, declspecs, decl_context, initialized)
4317 enum decl_context decl_context;
4322 tree type = NULL_TREE;
4327 int explicit_int = 0;
4328 int explicit_char = 0;
4329 int defaulted_int = 0;
4330 tree typedef_decl = 0;
4332 tree typedef_type = 0;
4333 int funcdef_flag = 0;
4334 enum tree_code innermost_code = ERROR_MARK;
4336 int size_varies = 0;
4337 tree decl_machine_attr = NULL_TREE;
4339 if (decl_context == BITFIELD)
4340 bitfield = 1, decl_context = FIELD;
4342 if (decl_context == FUNCDEF)
4343 funcdef_flag = 1, decl_context = NORMAL;
4345 push_obstacks_nochange ();
4347 if (flag_traditional && allocation_temporary_p ())
4348 end_temporary_allocation ();
4350 /* Look inside a declarator for the name being declared
4351 and get it as a string, for an error message. */
4353 register tree decl = declarator;
4357 switch (TREE_CODE (decl))
4362 innermost_code = TREE_CODE (decl);
4363 decl = TREE_OPERAND (decl, 0);
4366 case IDENTIFIER_NODE:
4367 name = IDENTIFIER_POINTER (decl);
4378 /* A function definition's declarator must have the form of
4379 a function declarator. */
4381 if (funcdef_flag && innermost_code != CALL_EXPR)
4384 /* Anything declared one level down from the top level
4385 must be one of the parameters of a function
4386 (because the body is at least two levels down). */
4388 /* If this looks like a function definition, make it one,
4389 even if it occurs where parms are expected.
4390 Then store_parm_decls will reject it and not use it as a parm. */
4391 if (decl_context == NORMAL && !funcdef_flag
4392 && current_binding_level->parm_flag)
4393 decl_context = PARM;
4395 /* Look through the decl specs and record which ones appear.
4396 Some typespecs are defined as built-in typenames.
4397 Others, the ones that are modifiers of other types,
4398 are represented by bits in SPECBITS: set the bits for
4399 the modifiers that appear. Storage class keywords are also in SPECBITS.
4401 If there is a typedef name or a type, store the type in TYPE.
4402 This includes builtin typedefs such as `int'.
4404 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4405 and did not come from a user typedef.
4407 Set LONGLONG if `long' is mentioned twice. */
4409 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4412 register tree id = TREE_VALUE (spec);
4414 if (id == ridpointers[(int) RID_INT])
4416 if (id == ridpointers[(int) RID_CHAR])
4419 if (TREE_CODE (id) == IDENTIFIER_NODE)
4420 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4422 if (ridpointers[i] == id)
4424 if (i == (int) RID_LONG && specbits & (1<<i))
4427 error ("`long long long' is too long for GCC");
4430 if (pedantic && ! in_system_header && warn_long_long)
4431 pedwarn ("ANSI C does not support `long long'");
4435 else if (specbits & (1 << i))
4436 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4442 error ("two or more data types in declaration of `%s'", name);
4443 /* Actual typedefs come to us as TYPE_DECL nodes. */
4444 else if (TREE_CODE (id) == TYPE_DECL)
4446 type = TREE_TYPE (id);
4447 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4450 /* Built-in types come as identifiers. */
4451 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4453 register tree t = lookup_name (id);
4454 if (TREE_TYPE (t) == error_mark_node)
4456 else if (!t || TREE_CODE (t) != TYPE_DECL)
4457 error ("`%s' fails to be a typedef or built in type",
4458 IDENTIFIER_POINTER (id));
4461 type = TREE_TYPE (t);
4465 else if (TREE_CODE (id) != ERROR_MARK)
4471 typedef_type = type;
4473 size_varies = C_TYPE_VARIABLE_SIZE (type);
4475 /* No type at all: default to `int', and set DEFAULTED_INT
4476 because it was not a user-defined typedef. */
4480 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4481 | (1 << (int) RID_SIGNED)
4482 | (1 << (int) RID_UNSIGNED))))
4483 /* Don't warn about typedef foo = bar. */
4484 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4485 && ! (in_system_header && ! allocation_temporary_p ()))
4487 /* C9x will probably require a diagnostic here.
4488 For now, issue a warning if -Wreturn-type and this is a function,
4489 or if -Wimplicit; prefer the former warning since it is more
4491 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4492 warn_about_return_type = 1;
4493 else if (warn_implicit_int)
4494 warning ("type defaults to `int' in declaration of `%s'", name);
4498 type = integer_type_node;
4501 /* Now process the modifiers that were specified
4502 and check for invalid combinations. */
4504 /* Long double is a special combination. */
4506 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4507 && TYPE_MAIN_VARIANT (type) == double_type_node)
4509 specbits &= ~ (1 << (int) RID_LONG);
4510 type = long_double_type_node;
4513 /* Check all other uses of type modifiers. */
4515 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4516 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4520 if ((specbits & 1 << (int) RID_LONG)
4521 && (specbits & 1 << (int) RID_SHORT))
4522 error ("both long and short specified for `%s'", name);
4523 else if (((specbits & 1 << (int) RID_LONG)
4524 || (specbits & 1 << (int) RID_SHORT))
4526 error ("long or short specified with char for `%s'", name);
4527 else if (((specbits & 1 << (int) RID_LONG)
4528 || (specbits & 1 << (int) RID_SHORT))
4529 && TREE_CODE (type) == REAL_TYPE)
4531 static int already = 0;
4533 error ("long or short specified with floating type for `%s'", name);
4534 if (! already && ! pedantic)
4536 error ("the only valid combination is `long double'");
4540 else if ((specbits & 1 << (int) RID_SIGNED)
4541 && (specbits & 1 << (int) RID_UNSIGNED))
4542 error ("both signed and unsigned specified for `%s'", name);
4543 else if (TREE_CODE (type) != INTEGER_TYPE)
4544 error ("long, short, signed or unsigned invalid for `%s'", name);
4548 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4550 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4552 if (flag_pedantic_errors)
4557 /* Discard the type modifiers if they are invalid. */
4560 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4561 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4566 if ((specbits & (1 << (int) RID_COMPLEX))
4567 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4569 error ("complex invalid for `%s'", name);
4570 specbits &= ~ (1 << (int) RID_COMPLEX);
4573 /* Decide whether an integer type is signed or not.
4574 Optionally treat bitfields as signed by default. */
4575 if (specbits & 1 << (int) RID_UNSIGNED
4576 /* Traditionally, all bitfields are unsigned. */
4577 || (bitfield && flag_traditional
4578 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4579 || (bitfield && ! flag_signed_bitfields
4580 && (explicit_int || defaulted_int || explicit_char
4581 /* A typedef for plain `int' without `signed'
4582 can be controlled just like plain `int'. */
4583 || ! (typedef_decl != 0
4584 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4585 && TREE_CODE (type) != ENUMERAL_TYPE
4586 && !(specbits & 1 << (int) RID_SIGNED)))
4589 type = long_long_unsigned_type_node;
4590 else if (specbits & 1 << (int) RID_LONG)
4591 type = long_unsigned_type_node;
4592 else if (specbits & 1 << (int) RID_SHORT)
4593 type = short_unsigned_type_node;
4594 else if (type == char_type_node)
4595 type = unsigned_char_type_node;
4596 else if (typedef_decl)
4597 type = unsigned_type (type);
4599 type = unsigned_type_node;
4601 else if ((specbits & 1 << (int) RID_SIGNED)
4602 && type == char_type_node)
4603 type = signed_char_type_node;
4605 type = long_long_integer_type_node;
4606 else if (specbits & 1 << (int) RID_LONG)
4607 type = long_integer_type_node;
4608 else if (specbits & 1 << (int) RID_SHORT)
4609 type = short_integer_type_node;
4611 if (specbits & 1 << (int) RID_COMPLEX)
4613 /* If we just have "complex", it is equivalent to
4614 "complex double", but if any modifiers at all are specified it is
4615 the complex form of TYPE. E.g, "complex short" is
4616 "complex short int". */
4618 if (defaulted_int && ! longlong
4619 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4620 | (1 << (int) RID_SIGNED)
4621 | (1 << (int) RID_UNSIGNED))))
4622 type = complex_double_type_node;
4623 else if (type == integer_type_node)
4624 type = complex_integer_type_node;
4625 else if (type == float_type_node)
4626 type = complex_float_type_node;
4627 else if (type == double_type_node)
4628 type = complex_double_type_node;
4629 else if (type == long_double_type_node)
4630 type = complex_long_double_type_node;
4632 type = build_complex_type (type);
4635 /* Set CONSTP if this declaration is `const', whether by
4636 explicit specification or via a typedef.
4637 Likewise for VOLATILEP. */
4639 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4640 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4641 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4643 pedwarn ("duplicate `const'");
4645 pedwarn ("duplicate `volatile'");
4646 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4647 type = TYPE_MAIN_VARIANT (type);
4649 /* Warn if two storage classes are given. Default to `auto'. */
4654 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4655 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4656 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4657 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4658 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4659 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4661 /* Warn about storage classes that are invalid for certain
4662 kinds of declarations (parameters, typenames, etc.). */
4665 error ("multiple storage classes in declaration of `%s'", name);
4666 else if (funcdef_flag
4668 & ((1 << (int) RID_REGISTER)
4669 | (1 << (int) RID_AUTO)
4670 | (1 << (int) RID_TYPEDEF))))
4672 if (specbits & 1 << (int) RID_AUTO
4673 && (pedantic || current_binding_level == global_binding_level))
4674 pedwarn ("function definition declared `auto'");
4675 if (specbits & 1 << (int) RID_REGISTER)
4676 error ("function definition declared `register'");
4677 if (specbits & 1 << (int) RID_TYPEDEF)
4678 error ("function definition declared `typedef'");
4679 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4680 | (1 << (int) RID_AUTO));
4682 else if (decl_context != NORMAL && nclasses > 0)
4684 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4688 error ((decl_context == FIELD
4689 ? "storage class specified for structure field `%s'"
4690 : (decl_context == PARM
4691 ? "storage class specified for parameter `%s'"
4692 : "storage class specified for typename")),
4694 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4695 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4696 | (1 << (int) RID_EXTERN));
4699 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4701 /* `extern' with initialization is invalid if not at top level. */
4702 if (current_binding_level == global_binding_level)
4703 warning ("`%s' initialized and declared `extern'", name);
4705 error ("`%s' has both `extern' and initializer", name);
4707 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4708 && current_binding_level != global_binding_level)
4709 error ("nested function `%s' declared `extern'", name);
4710 else if (current_binding_level == global_binding_level
4711 && specbits & (1 << (int) RID_AUTO))
4712 error ("top-level declaration of `%s' specifies `auto'", name);
4713 else if ((specbits & 1 << (int) RID_ITERATOR)
4714 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4716 error ("iterator `%s' has derived type", name);
4717 type = error_mark_node;
4719 else if ((specbits & 1 << (int) RID_ITERATOR)
4720 && TREE_CODE (type) != INTEGER_TYPE)
4722 error ("iterator `%s' has noninteger type", name);
4723 type = error_mark_node;
4727 /* Now figure out the structure of the declarator proper.
4728 Descend through it, creating more complex types, until we reach
4729 the declared identifier (or NULL_TREE, in an absolute declarator). */
4731 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4733 if (type == error_mark_node)
4735 declarator = TREE_OPERAND (declarator, 0);
4739 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4740 an INDIRECT_REF (for *...),
4741 a CALL_EXPR (for ...(...)),
4742 an identifier (for the name being declared)
4743 or a null pointer (for the place in an absolute declarator
4744 where the name was omitted).
4745 For the last two cases, we have just exited the loop.
4747 At this point, TYPE is the type of elements of an array,
4748 or for a function to return, or for a pointer to point to.
4749 After this sequence of ifs, TYPE is the type of the
4750 array or function or pointer, and DECLARATOR has had its
4751 outermost layer removed. */
4753 if (TREE_CODE (declarator) == ARRAY_REF)
4755 register tree itype = NULL_TREE;
4756 register tree size = TREE_OPERAND (declarator, 1);
4757 /* An uninitialized decl with `extern' is a reference. */
4758 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4759 /* The index is a signed object `sizetype' bits wide. */
4760 tree index_type = signed_type (sizetype);
4762 declarator = TREE_OPERAND (declarator, 0);
4764 /* Check for some types that there cannot be arrays of. */
4766 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4768 error ("declaration of `%s' as array of voids", name);
4769 type = error_mark_node;
4772 if (TREE_CODE (type) == FUNCTION_TYPE)
4774 error ("declaration of `%s' as array of functions", name);
4775 type = error_mark_node;
4778 if (size == error_mark_node)
4779 type = error_mark_node;
4781 if (type == error_mark_node)
4784 /* If this is a block level extern, it must live past the end
4785 of the function so that we can check it against other extern
4786 declarations (IDENTIFIER_LIMBO_VALUE). */
4787 if (extern_ref && allocation_temporary_p ())
4788 end_temporary_allocation ();
4790 /* If size was specified, set ITYPE to a range-type for that size.
4791 Otherwise, ITYPE remains null. finish_decl may figure it out
4792 from an initial value. */
4796 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4797 STRIP_TYPE_NOPS (size);
4799 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4800 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4802 error ("size of array `%s' has non-integer type", name);
4803 size = integer_one_node;
4806 if (pedantic && integer_zerop (size))
4807 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4809 if (TREE_CODE (size) == INTEGER_CST)
4811 constant_expression_warning (size);
4812 if (tree_int_cst_sgn (size) < 0)
4814 error ("size of array `%s' is negative", name);
4815 size = integer_one_node;
4820 /* Make sure the array size remains visibly nonconstant
4821 even if it is (eg) a const variable with known value. */
4826 if (TREE_CONSTANT (size))
4827 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4829 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4833 /* Convert size to index_type, so that if it is a variable
4834 the computations will be done in the proper mode. */
4835 itype = fold (build (MINUS_EXPR, index_type,
4836 convert (index_type, size),
4837 convert (index_type, size_one_node)));
4839 /* If that overflowed, the array is too big.
4840 ??? While a size of INT_MAX+1 technically shouldn't cause
4841 an overflow (because we subtract 1), the overflow is recorded
4842 during the conversion to index_type, before the subtraction.
4843 Handling this case seems like an unnecessary complication. */
4844 if (TREE_OVERFLOW (itype))
4846 error ("size of array `%s' is too large", name);
4847 type = error_mark_node;
4852 itype = variable_size (itype);
4853 itype = build_index_type (itype);
4856 #if 0 /* This had bad results for pointers to arrays, as in
4857 union incomplete (*foo)[4]; */
4858 /* Complain about arrays of incomplete types, except in typedefs. */
4860 if (TYPE_SIZE (type) == 0
4861 /* Avoid multiple warnings for nested array types. */
4862 && TREE_CODE (type) != ARRAY_TYPE
4863 && !(specbits & (1 << (int) RID_TYPEDEF))
4864 && !C_TYPE_BEING_DEFINED (type))
4865 warning ("array type has incomplete element type");
4868 #if 0 /* We shouldn't have a function type here at all!
4869 Functions aren't allowed as array elements. */
4870 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4871 && (constp || volatilep))
4872 pedwarn ("ANSI C forbids const or volatile function types");
4875 /* Build the array type itself, then merge any constancy or
4876 volatility into the target type. We must do it in this order
4877 to ensure that the TYPE_MAIN_VARIANT field of the array type
4878 is set correctly. */
4880 type = build_array_type (type, itype);
4881 if (constp || volatilep)
4882 type = c_build_type_variant (type, constp, volatilep);
4884 #if 0 /* don't clear these; leave them set so that the array type
4885 or the variable is itself const or volatile. */
4891 C_TYPE_VARIABLE_SIZE (type) = 1;
4893 else if (TREE_CODE (declarator) == CALL_EXPR)
4895 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4896 || current_binding_level == global_binding_level);
4899 /* Declaring a function type.
4900 Make sure we have a valid type for the function to return. */
4901 if (type == error_mark_node)
4906 /* Warn about some types functions can't return. */
4908 if (TREE_CODE (type) == FUNCTION_TYPE)
4910 error ("`%s' declared as function returning a function", name);
4911 type = integer_type_node;
4913 if (TREE_CODE (type) == ARRAY_TYPE)
4915 error ("`%s' declared as function returning an array", name);
4916 type = integer_type_node;
4919 #ifndef TRADITIONAL_RETURN_FLOAT
4920 /* Traditionally, declaring return type float means double. */
4922 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4923 type = double_type_node;
4924 #endif /* TRADITIONAL_RETURN_FLOAT */
4926 /* If this is a block level extern, it must live past the end
4927 of the function so that we can check it against other extern
4928 declarations (IDENTIFIER_LIMBO_VALUE). */
4929 if (extern_ref && allocation_temporary_p ())
4930 end_temporary_allocation ();
4932 /* Construct the function type and go to the next
4933 inner layer of declarator. */
4935 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4937 /* Say it's a definition
4938 only for the CALL_EXPR
4939 closest to the identifier. */
4940 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4941 #if 0 /* This seems to be false. We turn off temporary allocation
4942 above in this function if -traditional.
4943 And this code caused inconsistent results with prototypes:
4944 callers would ignore them, and pass arguments wrong. */
4946 /* Omit the arg types if -traditional, since the arg types
4947 and the list links might not be permanent. */
4948 type = build_function_type (type,
4950 ? NULL_TREE : arg_types);
4952 /* ANSI seems to say that `const int foo ();'
4953 does not make the function foo const. */
4954 if (constp || volatilep)
4955 type = c_build_type_variant (type, constp, volatilep);
4959 type = build_function_type (type, arg_types);
4960 declarator = TREE_OPERAND (declarator, 0);
4962 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4963 the formal parameter list of this FUNCTION_TYPE to point to
4964 the FUNCTION_TYPE node itself. */
4969 for (link = last_function_parm_tags;
4971 link = TREE_CHAIN (link))
4972 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4975 else if (TREE_CODE (declarator) == INDIRECT_REF)
4977 /* Merge any constancy or volatility into the target type
4980 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4981 && (constp || volatilep))
4982 pedwarn ("ANSI C forbids const or volatile function types");
4983 if (constp || volatilep)
4984 type = c_build_type_variant (type, constp, volatilep);
4989 type = build_pointer_type (type);
4991 /* Process a list of type modifier keywords
4992 (such as const or volatile) that were given inside the `*'. */
4994 if (TREE_TYPE (declarator))
4996 register tree typemodlist;
4998 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4999 typemodlist = TREE_CHAIN (typemodlist))
5001 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
5003 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
5008 error ("invalid type modifier within pointer declarator");
5012 pedwarn ("duplicate `const'");
5014 pedwarn ("duplicate `volatile'");
5017 declarator = TREE_OPERAND (declarator, 0);
5024 /* Now TYPE has the actual type. */
5026 /* Did array size calculations overflow? */
5028 if (TREE_CODE (type) == ARRAY_TYPE
5030 && TREE_OVERFLOW (TYPE_SIZE (type)))
5031 error ("size of array `%s' is too large", name);
5033 /* If this is declaring a typedef name, return a TYPE_DECL. */
5035 if (specbits & (1 << (int) RID_TYPEDEF))
5038 /* Note that the grammar rejects storage classes
5039 in typenames, fields or parameters */
5040 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5041 && (constp || volatilep))
5042 pedwarn ("ANSI C forbids const or volatile function types");
5043 if (constp || volatilep)
5044 type = c_build_type_variant (type, constp, volatilep);
5045 decl = build_decl (TYPE_DECL, declarator, type);
5046 if ((specbits & (1 << (int) RID_SIGNED))
5047 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5048 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5053 /* Detect the case of an array type of unspecified size
5054 which came, as such, direct from a typedef name.
5055 We must copy the type, so that each identifier gets
5056 a distinct type, so that each identifier's size can be
5057 controlled separately by its own initializer. */
5059 if (type != 0 && typedef_type != 0
5060 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5061 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5063 type = build_array_type (TREE_TYPE (type), 0);
5065 C_TYPE_VARIABLE_SIZE (type) = 1;
5068 /* If this is a type name (such as, in a cast or sizeof),
5069 compute the type and return it now. */
5071 if (decl_context == TYPENAME)
5073 /* Note that the grammar rejects storage classes
5074 in typenames, fields or parameters */
5075 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5076 && (constp || volatilep))
5077 pedwarn ("ANSI C forbids const or volatile function types");
5078 if (constp || volatilep)
5079 type = c_build_type_variant (type, constp, volatilep);
5084 /* Aside from typedefs and type names (handle above),
5085 `void' at top level (not within pointer)
5086 is allowed only in public variables.
5087 We don't complain about parms either, but that is because
5088 a better error message can be made later. */
5090 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5091 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5092 && ((specbits & (1 << (int) RID_EXTERN))
5093 || (current_binding_level == global_binding_level
5095 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5097 error ("variable or field `%s' declared void", name);
5098 type = integer_type_node;
5101 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5102 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5107 if (decl_context == PARM)
5109 tree type_as_written = type;
5112 /* A parameter declared as an array of T is really a pointer to T.
5113 One declared as a function is really a pointer to a function. */
5115 if (TREE_CODE (type) == ARRAY_TYPE)
5117 /* Transfer const-ness of array into that of type pointed to. */
5118 type = TREE_TYPE (type);
5119 if (constp || volatilep)
5120 type = c_build_type_variant (type, constp, volatilep);
5121 type = build_pointer_type (type);
5122 volatilep = constp = 0;
5125 else if (TREE_CODE (type) == FUNCTION_TYPE)
5127 if (pedantic && (constp || volatilep))
5128 pedwarn ("ANSI C forbids const or volatile function types");
5129 if (constp || volatilep)
5130 type = c_build_type_variant (type, constp, volatilep);
5131 type = build_pointer_type (type);
5132 volatilep = constp = 0;
5135 decl = build_decl (PARM_DECL, declarator, type);
5137 C_DECL_VARIABLE_SIZE (decl) = 1;
5139 /* Compute the type actually passed in the parmlist,
5140 for the case where there is no prototype.
5141 (For example, shorts and chars are passed as ints.)
5142 When there is a prototype, this is overridden later. */
5144 DECL_ARG_TYPE (decl) = type;
5145 main_type = (type == error_mark_node
5147 : TYPE_MAIN_VARIANT (type));
5148 if (main_type == float_type_node)
5149 DECL_ARG_TYPE (decl) = double_type_node;
5150 /* Don't use TYPE_PRECISION to decide whether to promote,
5151 because we should convert short if it's the same size as int,
5152 but we should not convert long if it's the same size as int. */
5153 else if (TREE_CODE (main_type) != ERROR_MARK
5154 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5156 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5157 && TREE_UNSIGNED (type))
5158 DECL_ARG_TYPE (decl) = unsigned_type_node;
5160 DECL_ARG_TYPE (decl) = integer_type_node;
5163 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5165 else if (decl_context == FIELD)
5167 /* Structure field. It may not be a function. */
5169 if (TREE_CODE (type) == FUNCTION_TYPE)
5171 error ("field `%s' declared as a function", name);
5172 type = build_pointer_type (type);
5174 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5176 error ("field `%s' has incomplete type", name);
5177 type = error_mark_node;
5179 /* Move type qualifiers down to element of an array. */
5180 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5182 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5184 TYPE_DOMAIN (type));
5185 #if 0 /* Leave the field const or volatile as well. */
5186 constp = volatilep = 0;
5189 decl = build_decl (FIELD_DECL, declarator, type);
5191 C_DECL_VARIABLE_SIZE (decl) = 1;
5193 else if (TREE_CODE (type) == FUNCTION_TYPE)
5195 /* Every function declaration is "external"
5196 except for those which are inside a function body
5197 in which `auto' is used.
5198 That is a case not specified by ANSI C,
5199 and we use it for forward declarations for nested functions. */
5200 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5201 || current_binding_level == global_binding_level);
5203 if (specbits & (1 << (int) RID_AUTO)
5204 && (pedantic || current_binding_level == global_binding_level))
5205 pedwarn ("invalid storage class for function `%s'", name);
5206 if (specbits & (1 << (int) RID_REGISTER))
5207 error ("invalid storage class for function `%s'", name);
5208 /* Function declaration not at top level.
5209 Storage classes other than `extern' are not allowed
5210 and `extern' makes no difference. */
5211 if (current_binding_level != global_binding_level
5212 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5214 pedwarn ("invalid storage class for function `%s'", name);
5216 /* If this is a block level extern, it must live past the end
5217 of the function so that we can check it against other
5218 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5219 if (extern_ref && allocation_temporary_p ())
5220 end_temporary_allocation ();
5222 decl = build_decl (FUNCTION_DECL, declarator, type);
5223 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5225 if (pedantic && (constp || volatilep)
5226 && ! DECL_IN_SYSTEM_HEADER (decl))
5227 pedwarn ("ANSI C forbids const or volatile functions");
5230 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5231 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5232 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5233 && ! DECL_IN_SYSTEM_HEADER (decl))
5234 pedwarn ("ANSI C forbids const or volatile void function return type");
5237 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5238 warning ("`noreturn' function returns non-void value");
5241 DECL_EXTERNAL (decl) = 1;
5242 /* Record absence of global scope for `static' or `auto'. */
5244 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5246 /* Record presence of `inline', if it is reasonable. */
5249 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5250 warning ("cannot inline function `main'");
5252 /* Assume that otherwise the function can be inlined. */
5253 DECL_INLINE (decl) = 1;
5255 if (specbits & (1 << (int) RID_EXTERN))
5256 current_extern_inline = 1;
5261 /* It's a variable. */
5262 /* An uninitialized decl with `extern' is a reference. */
5263 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5265 /* Move type qualifiers down to element of an array. */
5266 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5268 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5270 TYPE_DOMAIN (type));
5271 #if 0 /* Leave the variable const or volatile as well. */
5272 constp = volatilep = 0;
5276 /* If this is a block level extern, it must live past the end
5277 of the function so that we can check it against other
5278 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5279 if (extern_ref && allocation_temporary_p ())
5280 end_temporary_allocation ();
5282 decl = build_decl (VAR_DECL, declarator, type);
5284 C_DECL_VARIABLE_SIZE (decl) = 1;
5287 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5289 DECL_EXTERNAL (decl) = extern_ref;
5290 /* At top level, the presence of a `static' or `register' storage
5291 class specifier, or the absence of all storage class specifiers
5292 makes this declaration a definition (perhaps tentative). Also,
5293 the absence of both `static' and `register' makes it public. */
5294 if (current_binding_level == global_binding_level)
5298 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5299 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5301 /* Not at top level, only `static' makes a static definition. */
5304 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5305 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5308 if (specbits & 1 << (int) RID_ITERATOR)
5309 ITERATOR_P (decl) = 1;
5312 /* Record `register' declaration for warnings on &
5313 and in case doing stupid register allocation. */
5315 if (specbits & (1 << (int) RID_REGISTER))
5316 DECL_REGISTER (decl) = 1;
5318 /* Record constancy and volatility. */
5321 TREE_READONLY (decl) = 1;
5324 TREE_SIDE_EFFECTS (decl) = 1;
5325 TREE_THIS_VOLATILE (decl) = 1;
5327 /* If a type has volatile components, it should be stored in memory.
5328 Otherwise, the fact that those components are volatile
5329 will be ignored, and would even crash the compiler. */
5330 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5331 mark_addressable (decl);
5339 /* Decode the parameter-list info for a function type or function definition.
5340 The argument is the value returned by `get_parm_info' (or made in parse.y
5341 if there is an identifier list instead of a parameter decl list).
5342 These two functions are separate because when a function returns
5343 or receives functions then each is called multiple times but the order
5344 of calls is different. The last call to `grokparms' is always the one
5345 that contains the formal parameter names of a function definition.
5347 Store in `last_function_parms' a chain of the decls of parms.
5348 Also store in `last_function_parm_tags' a chain of the struct, union,
5349 and enum tags declared among the parms.
5351 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5353 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5354 a mere declaration. A nonempty identifier-list gets an error message
5355 when FUNCDEF_FLAG is zero. */
5358 grokparms (parms_info, funcdef_flag)
5362 tree first_parm = TREE_CHAIN (parms_info);
5364 last_function_parms = TREE_PURPOSE (parms_info);
5365 last_function_parm_tags = TREE_VALUE (parms_info);
5367 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5368 && !in_system_header)
5369 warning ("function declaration isn't a prototype");
5372 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5375 pedwarn ("parameter names (without types) in function declaration");
5377 last_function_parms = first_parm;
5384 /* We no longer test FUNCDEF_FLAG.
5385 If the arg types are incomplete in a declaration,
5386 they must include undefined tags.
5387 These tags can never be defined in the scope of the declaration,
5388 so the types can never be completed,
5389 and no call can be compiled successfully. */
5391 /* In a fcn definition, arg types must be complete. */
5394 for (parm = last_function_parms, typelt = first_parm;
5396 parm = TREE_CHAIN (parm))
5397 /* Skip over any enumeration constants declared here. */
5398 if (TREE_CODE (parm) == PARM_DECL)
5400 /* Barf if the parameter itself has an incomplete type. */
5401 tree type = TREE_VALUE (typelt);
5402 if (TYPE_SIZE (type) == 0)
5404 if (funcdef_flag && DECL_NAME (parm) != 0)
5405 error ("parameter `%s' has incomplete type",
5406 IDENTIFIER_POINTER (DECL_NAME (parm)));
5408 warning ("parameter has incomplete type");
5411 TREE_VALUE (typelt) = error_mark_node;
5412 TREE_TYPE (parm) = error_mark_node;
5415 #if 0 /* This has been replaced by parm_tags_warning
5416 which uses a more accurate criterion for what to warn about. */
5419 /* Now warn if is a pointer to an incomplete type. */
5420 while (TREE_CODE (type) == POINTER_TYPE
5421 || TREE_CODE (type) == REFERENCE_TYPE)
5422 type = TREE_TYPE (type);
5423 type = TYPE_MAIN_VARIANT (type);
5424 if (TYPE_SIZE (type) == 0)
5426 if (DECL_NAME (parm) != 0)
5427 warning ("parameter `%s' points to incomplete type",
5428 IDENTIFIER_POINTER (DECL_NAME (parm)));
5430 warning ("parameter points to incomplete type");
5434 typelt = TREE_CHAIN (typelt);
5437 /* Allocate the list of types the way we allocate a type. */
5438 if (first_parm && ! TREE_PERMANENT (first_parm))
5440 /* Construct a copy of the list of types
5441 on the saveable obstack. */
5443 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5444 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5446 return nreverse (result);
5449 /* The list we have is permanent already. */
5455 /* Return a tree_list node with info on a parameter list just parsed.
5456 The TREE_PURPOSE is a chain of decls of those parms.
5457 The TREE_VALUE is a list of structure, union and enum tags defined.
5458 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5459 This tree_list node is later fed to `grokparms'.
5461 VOID_AT_END nonzero means append `void' to the end of the type-list.
5462 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5465 get_parm_info (void_at_end)
5468 register tree decl, t;
5469 register tree types = 0;
5471 tree tags = gettags ();
5472 tree parms = getdecls ();
5474 tree order = current_binding_level->parm_order;
5476 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5477 if (void_at_end && parms != 0
5478 && TREE_CHAIN (parms) == 0
5479 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5480 && DECL_NAME (parms) == 0)
5483 storedecls (NULL_TREE);
5484 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5485 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5488 /* Extract enumerator values and other non-parms declared with the parms.
5489 Likewise any forward parm decls that didn't have real parm decls. */
5490 for (decl = parms; decl; )
5492 tree next = TREE_CHAIN (decl);
5494 if (TREE_CODE (decl) != PARM_DECL)
5496 TREE_CHAIN (decl) = new_parms;
5499 else if (TREE_ASM_WRITTEN (decl))
5501 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5502 TREE_CHAIN (decl) = new_parms;
5508 /* Put the parm decls back in the order they were in in the parm list. */
5509 for (t = order; t; t = TREE_CHAIN (t))
5512 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5514 TREE_CHAIN (TREE_VALUE (t)) = 0;
5517 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5520 /* Store the parmlist in the binding level since the old one
5521 is no longer a valid list. (We have changed the chain pointers.) */
5522 storedecls (new_parms);
5524 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5525 /* There may also be declarations for enumerators if an enumeration
5526 type is declared among the parms. Ignore them here. */
5527 if (TREE_CODE (decl) == PARM_DECL)
5529 /* Since there is a prototype,
5530 args are passed in their declared types. */
5531 tree type = TREE_TYPE (decl);
5532 DECL_ARG_TYPE (decl) = type;
5533 #ifdef PROMOTE_PROTOTYPES
5534 if ((TREE_CODE (type) == INTEGER_TYPE
5535 || TREE_CODE (type) == ENUMERAL_TYPE)
5536 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5537 DECL_ARG_TYPE (decl) = integer_type_node;
5540 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5541 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5542 && DECL_NAME (decl) == 0)
5544 error ("`void' in parameter list must be the entire list");
5550 return saveable_tree_cons (new_parms, tags,
5551 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5553 return saveable_tree_cons (new_parms, tags, nreverse (types));
5556 /* At end of parameter list, warn about any struct, union or enum tags
5557 defined within. Do so because these types cannot ever become complete. */
5560 parmlist_tags_warning ()
5565 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5567 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5568 /* An anonymous union parm type is meaningful as a GNU extension.
5569 So don't warn for that. */
5570 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5572 if (TREE_PURPOSE (elt) != 0)
5573 warning ("`%s %s' declared inside parameter list",
5574 (code == RECORD_TYPE ? "struct"
5575 : code == UNION_TYPE ? "union"
5577 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5579 warning ("anonymous %s declared inside parameter list",
5580 (code == RECORD_TYPE ? "struct"
5581 : code == UNION_TYPE ? "union"
5586 warning ("its scope is only this definition or declaration,");
5587 warning ("which is probably not what you want.");
5593 /* Get the struct, enum or union (CODE says which) with tag NAME.
5594 Define the tag as a forward-reference if it is not defined. */
5597 xref_tag (code, name)
5598 enum tree_code code;
5601 int temporary = allocation_temporary_p ();
5603 /* If a cross reference is requested, look up the type
5604 already defined for this tag and return it. */
5606 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5607 /* Even if this is the wrong type of tag, return what we found.
5608 There will be an error message anyway, from pending_xref_error.
5609 If we create an empty xref just for an invalid use of the type,
5610 the main result is to create lots of superfluous error messages. */
5614 push_obstacks_nochange ();
5616 if (current_binding_level == global_binding_level && temporary)
5617 end_temporary_allocation ();
5619 /* If no such tag is yet defined, create a forward-reference node
5620 and record it as the "definition".
5621 When a real declaration of this type is found,
5622 the forward-reference will be altered into a real type. */
5624 ref = make_node (code);
5625 if (code == ENUMERAL_TYPE)
5627 /* (In ANSI, Enums can be referred to only if already defined.) */
5629 pedwarn ("ANSI C forbids forward references to `enum' types");
5630 /* Give the type a default layout like unsigned int
5631 to avoid crashing if it does not get defined. */
5632 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5633 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5634 TREE_UNSIGNED (ref) = 1;
5635 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5636 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5637 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5640 pushtag (name, ref);
5647 /* Make sure that the tag NAME is defined *in the current binding level*
5648 at least as a forward reference.
5649 CODE says which kind of tag NAME ought to be.
5651 We also do a push_obstacks_nochange
5652 whose matching pop is in finish_struct. */
5655 start_struct (code, name)
5656 enum tree_code code;
5659 /* If there is already a tag defined at this binding level
5660 (as a forward reference), just return it. */
5662 register tree ref = 0;
5664 push_obstacks_nochange ();
5665 if (current_binding_level == global_binding_level)
5666 end_temporary_allocation ();
5669 ref = lookup_tag (code, name, current_binding_level, 1);
5670 if (ref && TREE_CODE (ref) == code)
5672 C_TYPE_BEING_DEFINED (ref) = 1;
5673 TYPE_PACKED (ref) = flag_pack_struct;
5674 if (TYPE_FIELDS (ref))
5675 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5676 : "redefinition of `struct %s'"),
5677 IDENTIFIER_POINTER (name));
5682 /* Otherwise create a forward-reference just so the tag is in scope. */
5684 ref = make_node (code);
5685 pushtag (name, ref);
5686 C_TYPE_BEING_DEFINED (ref) = 1;
5687 TYPE_PACKED (ref) = flag_pack_struct;
5691 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5692 of a structure component, returning a FIELD_DECL node.
5693 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5695 This is done during the parsing of the struct declaration.
5696 The FIELD_DECL nodes are chained together and the lot of them
5697 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5700 grokfield (filename, line, declarator, declspecs, width)
5703 tree declarator, declspecs, width;
5707 /* The corresponding pop_obstacks is in finish_decl. */
5708 push_obstacks_nochange ();
5710 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5712 finish_decl (value, NULL_TREE, NULL_TREE);
5713 DECL_INITIAL (value) = width;
5715 maybe_objc_check_decl (value);
5719 /* Function to help qsort sort FIELD_DECLs by name order. */
5722 field_decl_cmp (xp, yp)
5723 const GENERIC_PTR xp;
5724 const GENERIC_PTR yp;
5726 tree *x = (tree *)xp, *y = (tree *)yp;
5728 if (DECL_NAME (*x) == DECL_NAME (*y))
5730 if (DECL_NAME (*x) == NULL)
5732 if (DECL_NAME (*y) == NULL)
5734 if (DECL_NAME (*x) < DECL_NAME (*y))
5739 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5740 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5741 ATTRIBUTES are attributes to be applied to the structure.
5743 We also do a pop_obstacks to match the push in start_struct. */
5746 finish_struct (t, fieldlist, attributes)
5753 int toplevel = global_binding_level == current_binding_level;
5755 /* If this type was previously laid out as a forward reference,
5756 make sure we lay it out again. */
5760 decl_attributes (t, attributes, NULL_TREE);
5762 /* Nameless union parm types are useful as GCC extension. */
5763 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5764 /* Otherwise, warn about any struct or union def. in parmlist. */
5765 if (in_parm_level_p ())
5768 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5769 : "structure defined inside parms"));
5770 else if (! flag_traditional)
5771 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5772 : "structure defined inside parms"));
5775 old_momentary = suspend_momentary ();
5779 for (x = fieldlist; x; x = TREE_CHAIN (x))
5780 if (DECL_NAME (x) != 0)
5784 pedwarn ("%s has no %smembers",
5785 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5786 (fieldlist ? "named " : ""));
5789 /* Install struct as DECL_CONTEXT of each field decl.
5790 Also process specified field sizes.
5791 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5792 The specified size is found in the DECL_INITIAL.
5793 Store 0 there, except for ": 0" fields (so we can find them
5794 and delete them, below). */
5796 for (x = fieldlist; x; x = TREE_CHAIN (x))
5798 DECL_CONTEXT (x) = t;
5799 DECL_PACKED (x) |= TYPE_PACKED (t);
5800 DECL_FIELD_SIZE (x) = 0;
5802 /* If any field is const, the structure type is pseudo-const. */
5803 if (TREE_READONLY (x))
5804 C_TYPE_FIELDS_READONLY (t) = 1;
5807 /* A field that is pseudo-const makes the structure likewise. */
5808 tree t1 = TREE_TYPE (x);
5809 while (TREE_CODE (t1) == ARRAY_TYPE)
5810 t1 = TREE_TYPE (t1);
5811 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5812 && C_TYPE_FIELDS_READONLY (t1))
5813 C_TYPE_FIELDS_READONLY (t) = 1;
5816 /* Any field that is volatile means variables of this type must be
5817 treated in some ways as volatile. */
5818 if (TREE_THIS_VOLATILE (x))
5819 C_TYPE_FIELDS_VOLATILE (t) = 1;
5821 /* Any field of nominal variable size implies structure is too. */
5822 if (C_DECL_VARIABLE_SIZE (x))
5823 C_TYPE_VARIABLE_SIZE (t) = 1;
5825 /* Detect invalid nested redefinition. */
5826 if (TREE_TYPE (x) == t)
5827 error ("nested redefinition of `%s'",
5828 IDENTIFIER_POINTER (TYPE_NAME (t)));
5830 /* Detect invalid bit-field size. */
5831 if (DECL_INITIAL (x))
5832 STRIP_NOPS (DECL_INITIAL (x));
5833 if (DECL_INITIAL (x))
5835 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5836 constant_expression_warning (DECL_INITIAL (x));
5839 error_with_decl (x, "bit-field `%s' width not an integer constant");
5840 DECL_INITIAL (x) = NULL;
5844 /* Detect invalid bit-field type. */
5845 if (DECL_INITIAL (x)
5846 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5847 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5849 error_with_decl (x, "bit-field `%s' has invalid type");
5850 DECL_INITIAL (x) = NULL;
5852 if (DECL_INITIAL (x) && pedantic
5853 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5854 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5855 /* Accept an enum that's equivalent to int or unsigned int. */
5856 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5857 && (TYPE_PRECISION (TREE_TYPE (x))
5858 == TYPE_PRECISION (integer_type_node))))
5859 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5861 /* Detect and ignore out of range field width. */
5862 if (DECL_INITIAL (x))
5864 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5866 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5868 DECL_INITIAL (x) = NULL;
5869 error_with_decl (x, "negative width in bit-field `%s'");
5871 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5872 || width > TYPE_PRECISION (TREE_TYPE (x)))
5874 DECL_INITIAL (x) = NULL;
5875 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5877 else if (width == 0 && DECL_NAME (x) != 0)
5879 error_with_decl (x, "zero width for bit-field `%s'");
5880 DECL_INITIAL (x) = NULL;
5884 /* Process valid field width. */
5885 if (DECL_INITIAL (x))
5887 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5889 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5890 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5891 TREE_UNSIGNED (TREE_TYPE (x)))
5892 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5893 TREE_UNSIGNED (TREE_TYPE (x)))))
5894 warning_with_decl (x, "`%s' is narrower than values of its type");
5896 DECL_FIELD_SIZE (x) = width;
5897 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5898 DECL_INITIAL (x) = NULL;
5902 /* field size 0 => force desired amount of alignment. */
5903 #ifdef EMPTY_FIELD_BOUNDARY
5904 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5906 #ifdef PCC_BITFIELD_TYPE_MATTERS
5907 if (PCC_BITFIELD_TYPE_MATTERS)
5908 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5909 TYPE_ALIGN (TREE_TYPE (x)));
5913 else if (TREE_TYPE (x) != error_mark_node)
5915 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5916 : TYPE_ALIGN (TREE_TYPE (x)));
5917 /* Non-bit-fields are aligned for their type, except packed
5918 fields which require only BITS_PER_UNIT alignment. */
5919 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5923 /* Now DECL_INITIAL is null on all members. */
5925 /* Delete all duplicate fields from the fieldlist */
5926 for (x = fieldlist; x && TREE_CHAIN (x);)
5927 /* Anonymous fields aren't duplicates. */
5928 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5932 register tree y = fieldlist;
5936 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5942 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5944 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5945 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5947 else x = TREE_CHAIN (x);
5950 /* Now we have the nearly final fieldlist. Record it,
5951 then lay out the structure or union (including the fields). */
5953 TYPE_FIELDS (t) = fieldlist;
5957 /* Delete all zero-width bit-fields from the front of the fieldlist */
5959 && DECL_INITIAL (fieldlist))
5960 fieldlist = TREE_CHAIN (fieldlist);
5961 /* Delete all such members from the rest of the fieldlist */
5962 for (x = fieldlist; x;)
5964 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5965 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5966 else x = TREE_CHAIN (x);
5969 /* Now we have the truly final field list.
5970 Store it in this type and in the variants. */
5972 TYPE_FIELDS (t) = fieldlist;
5974 /* If there are lots of fields, sort so we can look through them fast.
5975 We arbitrarily consider 16 or more elts to be "a lot". */
5979 for (x = fieldlist; x; x = TREE_CHAIN (x))
5990 len += list_length (x);
5991 /* Use the same allocation policy here that make_node uses, to
5992 ensure that this lives as long as the rest of the struct decl.
5993 All decls in an inline function need to be saved. */
5994 if (allocation_temporary_p ())
5995 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5997 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5999 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
6000 TYPE_LANG_SPECIFIC (t)->len = len;
6002 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
6004 for (x = fieldlist; x; x = TREE_CHAIN (x))
6005 field_array[len++] = x;
6007 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6011 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6013 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6014 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6015 TYPE_ALIGN (x) = TYPE_ALIGN (t);
6018 /* If this was supposed to be a transparent union, but we can't
6019 make it one, warn and turn off the flag. */
6020 if (TREE_CODE (t) == UNION_TYPE
6021 && TYPE_TRANSPARENT_UNION (t)
6022 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
6024 TYPE_TRANSPARENT_UNION (t) = 0;
6025 warning ("union cannot be made transparent");
6028 /* If this structure or union completes the type of any previous
6029 variable declaration, lay it out and output its rtl. */
6031 if (current_binding_level->n_incomplete != 0)
6034 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
6036 if (TREE_TYPE (decl) == t
6037 && TREE_CODE (decl) != TYPE_DECL)
6039 layout_decl (decl, 0);
6040 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6041 maybe_objc_check_decl (decl);
6042 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6045 --current_binding_level->n_incomplete;
6047 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6048 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6050 tree element = TREE_TYPE (decl);
6051 while (TREE_CODE (element) == ARRAY_TYPE)
6052 element = TREE_TYPE (element);
6054 layout_array_type (TREE_TYPE (decl));
6059 resume_momentary (old_momentary);
6061 /* Finish debugging output for this type. */
6062 rest_of_type_compilation (t, toplevel);
6064 /* The matching push is in start_struct. */
6070 /* Lay out the type T, and its element type, and so on. */
6073 layout_array_type (t)
6076 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6077 layout_array_type (TREE_TYPE (t));
6081 /* Begin compiling the definition of an enumeration type.
6082 NAME is its name (or null if anonymous).
6083 Returns the type object, as yet incomplete.
6084 Also records info about it so that build_enumerator
6085 may be used to declare the individual values as they are read. */
6091 register tree enumtype = 0;
6093 /* If this is the real definition for a previous forward reference,
6094 fill in the contents in the same object that used to be the
6095 forward reference. */
6098 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6100 /* The corresponding pop_obstacks is in finish_enum. */
6101 push_obstacks_nochange ();
6102 /* If these symbols and types are global, make them permanent. */
6103 if (current_binding_level == global_binding_level)
6104 end_temporary_allocation ();
6106 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6108 enumtype = make_node (ENUMERAL_TYPE);
6109 pushtag (name, enumtype);
6112 C_TYPE_BEING_DEFINED (enumtype) = 1;
6114 if (TYPE_VALUES (enumtype) != 0)
6116 /* This enum is a named one that has been declared already. */
6117 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6119 /* Completely replace its old definition.
6120 The old enumerators remain defined, however. */
6121 TYPE_VALUES (enumtype) = 0;
6124 enum_next_value = integer_zero_node;
6127 if (flag_short_enums)
6128 TYPE_PACKED (enumtype) = 1;
6133 /* After processing and defining all the values of an enumeration type,
6134 install their decls in the enumeration type and finish it off.
6135 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6136 and ATTRIBUTES are the specified attributes.
6137 Returns ENUMTYPE. */
6140 finish_enum (enumtype, values, attributes)
6145 register tree pair, tem;
6146 tree minnode = 0, maxnode = 0;
6147 int lowprec, highprec, precision;
6148 int toplevel = global_binding_level == current_binding_level;
6150 if (in_parm_level_p ())
6151 warning ("enum defined inside parms");
6153 decl_attributes (enumtype, attributes, NULL_TREE);
6155 /* Calculate the maximum value of any enumerator in this type. */
6157 if (values == error_mark_node)
6158 minnode = maxnode = integer_zero_node;
6160 for (pair = values; pair; pair = TREE_CHAIN (pair))
6162 tree value = TREE_VALUE (pair);
6164 minnode = maxnode = TREE_VALUE (pair);
6167 if (tree_int_cst_lt (maxnode, value))
6169 if (tree_int_cst_lt (value, minnode))
6174 TYPE_MIN_VALUE (enumtype) = minnode;
6175 TYPE_MAX_VALUE (enumtype) = maxnode;
6177 /* An enum can have some negative values; then it is signed. */
6178 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6180 /* Determine the precision this type needs. */
6182 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6183 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6184 precision = MAX (lowprec, highprec);
6186 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6188 tree narrowest = type_for_size (precision, 1);
6191 warning ("enumeration values exceed range of largest integer");
6192 narrowest = long_long_integer_type_node;
6195 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6198 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6200 TYPE_SIZE (enumtype) = 0;
6201 layout_type (enumtype);
6203 if (values != error_mark_node)
6205 /* Change the type of the enumerators to be the enum type.
6206 Formerly this was done only for enums that fit in an int,
6207 but the comment said it was done only for enums wider than int.
6208 It seems necessary to do this for wide enums,
6209 and best not to change what's done for ordinary narrower ones. */
6210 for (pair = values; pair; pair = TREE_CHAIN (pair))
6212 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6213 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6214 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6215 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6218 /* Replace the decl nodes in VALUES with their names. */
6219 for (pair = values; pair; pair = TREE_CHAIN (pair))
6220 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6222 TYPE_VALUES (enumtype) = values;
6225 /* Fix up all variant types of this enum type. */
6226 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6228 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6229 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6230 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6231 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6232 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6233 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6234 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6235 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6236 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6239 /* Finish debugging output for this type. */
6240 rest_of_type_compilation (enumtype, toplevel);
6242 /* This matches a push in start_enum. */
6248 /* Build and install a CONST_DECL for one value of the
6249 current enumeration type (one that was begun with start_enum).
6250 Return a tree-list containing the CONST_DECL and its value.
6251 Assignment of sequential values by default is handled here. */
6254 build_enumerator (name, value)
6257 register tree decl, type;
6259 /* Validate and default VALUE. */
6261 /* Remove no-op casts from the value. */
6263 STRIP_TYPE_NOPS (value);
6267 if (TREE_CODE (value) == INTEGER_CST)
6269 value = default_conversion (value);
6270 constant_expression_warning (value);
6274 error ("enumerator value for `%s' not integer constant",
6275 IDENTIFIER_POINTER (name));
6280 /* Default based on previous value. */
6281 /* It should no longer be possible to have NON_LVALUE_EXPR
6285 value = enum_next_value;
6287 error ("overflow in enumeration values");
6290 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6292 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6293 value = integer_zero_node;
6296 /* Set basis for default for next value. */
6297 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6298 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6300 /* Now create a declaration for the enum value name. */
6302 type = TREE_TYPE (value);
6303 type = type_for_size (MAX (TYPE_PRECISION (type),
6304 TYPE_PRECISION (integer_type_node)),
6306 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6307 && TREE_UNSIGNED (type)));
6309 decl = build_decl (CONST_DECL, name, type);
6310 DECL_INITIAL (decl) = value;
6311 TREE_TYPE (value) = type;
6314 return saveable_tree_cons (decl, value, NULL_TREE);
6317 /* Create the FUNCTION_DECL for a function definition.
6318 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6319 the declaration; they describe the function's name and the type it returns,
6320 but twisted together in a fashion that parallels the syntax of C.
6322 This function creates a binding context for the function body
6323 as well as setting up the FUNCTION_DECL in current_function_decl.
6325 Returns 1 on success. If the DECLARATOR is not suitable for a function
6326 (it defines a datum instead), we return 0, which tells
6327 yyparse to report a parse error.
6329 NESTED is nonzero for a function nested within another function. */
6332 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6333 tree declarator, declspecs, prefix_attributes, attributes;
6336 tree decl1, old_decl;
6338 int old_immediate_size_expand = immediate_size_expand;
6340 current_function_returns_value = 0; /* Assume, until we see it does. */
6341 current_function_returns_null = 0;
6342 warn_about_return_type = 0;
6343 current_extern_inline = 0;
6344 c_function_varargs = 0;
6346 shadowed_labels = 0;
6348 /* Don't expand any sizes in the return type of the function. */
6349 immediate_size_expand = 0;
6351 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6353 /* If the declarator is not suitable for a function definition,
6354 cause a syntax error. */
6357 immediate_size_expand = old_immediate_size_expand;
6361 decl_attributes (decl1, prefix_attributes, attributes);
6363 announce_function (decl1);
6365 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6367 error ("return-type is an incomplete type");
6368 /* Make it return void instead. */
6370 = build_function_type (void_type_node,
6371 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6374 if (warn_about_return_type)
6375 warning ("return-type defaults to `int'");
6377 /* Save the parm names or decls from this function's declarator
6378 where store_parm_decls will find them. */
6379 current_function_parms = last_function_parms;
6380 current_function_parm_tags = last_function_parm_tags;
6382 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6383 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6384 DECL_INITIAL (decl1) = error_mark_node;
6386 /* If this definition isn't a prototype and we had a prototype declaration
6387 before, copy the arg type info from that prototype.
6388 But not if what we had before was a builtin function. */
6389 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6390 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6391 && !DECL_BUILT_IN (old_decl)
6392 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6393 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6394 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6396 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6397 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6398 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6401 /* If there is no explicit declaration, look for any out-of-scope implicit
6404 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6406 /* Optionally warn of old-fashioned def with no previous prototype. */
6407 if (warn_strict_prototypes
6408 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6409 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6410 warning ("function declaration isn't a prototype");
6411 /* Optionally warn of any global def with no previous prototype. */
6412 else if (warn_missing_prototypes
6413 && TREE_PUBLIC (decl1)
6414 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6415 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6416 warning_with_decl (decl1, "no previous prototype for `%s'");
6417 /* Optionally warn of any def with no previous prototype
6418 if the function has already been used. */
6419 else if (warn_missing_prototypes
6420 && old_decl != 0 && TREE_USED (old_decl)
6421 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6422 warning_with_decl (decl1,
6423 "`%s' was used with no prototype before its definition");
6424 /* Optionally warn of any global def with no previous declaration. */
6425 else if (warn_missing_declarations
6426 && TREE_PUBLIC (decl1)
6428 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6429 warning_with_decl (decl1, "no previous declaration for `%s'");
6430 /* Optionally warn of any def with no previous declaration
6431 if the function has already been used. */
6432 else if (warn_missing_declarations
6433 && old_decl != 0 && TREE_USED (old_decl)
6434 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6435 warning_with_decl (decl1,
6436 "`%s' was used with no declaration before its definition");
6438 /* This is a definition, not a reference.
6439 So normally clear DECL_EXTERNAL.
6440 However, `extern inline' acts like a declaration
6441 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6442 DECL_EXTERNAL (decl1) = current_extern_inline;
6444 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6445 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6448 /* This function exists in static storage.
6449 (This does not mean `static' in the C sense!) */
6450 TREE_STATIC (decl1) = 1;
6452 /* A nested function is not global. */
6453 if (current_function_decl != 0)
6454 TREE_PUBLIC (decl1) = 0;
6456 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6458 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6463 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6464 != integer_type_node)
6465 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6467 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6468 args = TREE_CHAIN (args))
6470 tree type = args ? TREE_VALUE (args) : 0;
6472 if (type == void_type_node)
6479 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6480 pedwarn_with_decl (decl1,
6481 "first argument of `%s' should be `int'");
6485 if (TREE_CODE (type) != POINTER_TYPE
6486 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6487 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6489 pedwarn_with_decl (decl1,
6490 "second argument of `%s' should be `char **'");
6494 if (TREE_CODE (type) != POINTER_TYPE
6495 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6496 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6498 pedwarn_with_decl (decl1,
6499 "third argument of `%s' should probably be `char **'");
6504 /* It is intentional that this message does not mention the third
6505 argument, which is warned for only pedantically, because it's
6506 blessed by mention in an appendix of the standard. */
6507 if (argct > 0 && (argct < 2 || argct > 3))
6508 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6510 if (argct == 3 && pedantic)
6511 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6513 if (! TREE_PUBLIC (decl1))
6514 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6517 /* Record the decl so that the function name is defined.
6518 If we already have a decl for this name, and it is a FUNCTION_DECL,
6519 use the old decl. */
6521 current_function_decl = pushdecl (decl1);
6524 declare_parm_level (1);
6525 current_binding_level->subblocks_tag_transparent = 1;
6527 make_function_rtl (current_function_decl);
6529 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6530 /* Promote the value to int before returning it. */
6531 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6533 /* It retains unsignedness if traditional
6534 or if not really getting wider. */
6535 if (TREE_UNSIGNED (restype)
6536 && (flag_traditional
6537 || (TYPE_PRECISION (restype)
6538 == TYPE_PRECISION (integer_type_node))))
6539 restype = unsigned_type_node;
6541 restype = integer_type_node;
6543 DECL_RESULT (current_function_decl)
6544 = build_decl (RESULT_DECL, NULL_TREE, restype);
6547 /* Allocate further tree nodes temporarily during compilation
6548 of this function only. */
6549 temporary_allocation ();
6551 /* If this fcn was already referenced via a block-scope `extern' decl
6552 (or an implicit decl), propagate certain information about the usage. */
6553 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6554 TREE_ADDRESSABLE (current_function_decl) = 1;
6556 immediate_size_expand = old_immediate_size_expand;
6561 /* Record that this function is going to be a varargs function.
6562 This is called before store_parm_decls, which is too early
6563 to call mark_varargs directly. */
6568 c_function_varargs = 1;
6571 /* Store the parameter declarations into the current function declaration.
6572 This is called after parsing the parameter declarations, before
6573 digesting the body of the function.
6575 For an old-style definition, modify the function's type
6576 to specify at least the number of arguments. */
6581 register tree fndecl = current_function_decl;
6584 /* This is either a chain of PARM_DECLs (if a prototype was used)
6585 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6586 tree specparms = current_function_parms;
6588 /* This is a list of types declared among parms in a prototype. */
6589 tree parmtags = current_function_parm_tags;
6591 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6592 register tree parmdecls = getdecls ();
6594 /* This is a chain of any other decls that came in among the parm
6595 declarations. If a parm is declared with enum {foo, bar} x;
6596 then CONST_DECLs for foo and bar are put here. */
6599 /* Nonzero if this definition is written with a prototype. */
6602 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6604 /* This case is when the function was defined with an ANSI prototype.
6605 The parms already have decls, so we need not do anything here
6606 except record them as in effect
6607 and complain if any redundant old-style parm decls were written. */
6618 error_with_decl (fndecl,
6619 "parm types given both in parmlist and separately");
6620 /* Get rid of the erroneous decls; don't keep them on
6621 the list of parms, since they might not be PARM_DECLs. */
6622 for (decl = current_binding_level->names;
6623 decl; decl = TREE_CHAIN (decl))
6624 if (DECL_NAME (decl))
6625 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6626 for (link = current_binding_level->shadowed;
6627 link; link = TREE_CHAIN (link))
6628 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6629 current_binding_level->names = 0;
6630 current_binding_level->shadowed = 0;
6633 specparms = nreverse (specparms);
6634 for (parm = specparms; parm; parm = next)
6636 next = TREE_CHAIN (parm);
6637 if (TREE_CODE (parm) == PARM_DECL)
6639 if (DECL_NAME (parm) == 0)
6640 error_with_decl (parm, "parameter name omitted");
6641 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6643 error_with_decl (parm, "parameter `%s' declared void");
6644 /* Change the type to error_mark_node so this parameter
6645 will be ignored by assign_parms. */
6646 TREE_TYPE (parm) = error_mark_node;
6652 /* If we find an enum constant or a type tag,
6653 put it aside for the moment. */
6654 TREE_CHAIN (parm) = 0;
6655 others = chainon (others, parm);
6659 /* Get the decls in their original chain order
6660 and record in the function. */
6661 DECL_ARGUMENTS (fndecl) = getdecls ();
6664 /* If this function takes a variable number of arguments,
6665 add a phony parameter to the end of the parm list,
6666 to represent the position of the first unnamed argument. */
6667 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6670 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6671 /* Let's hope the address of the unnamed parm
6672 won't depend on its type. */
6673 TREE_TYPE (dummy) = integer_type_node;
6674 DECL_ARG_TYPE (dummy) = integer_type_node;
6675 DECL_ARGUMENTS (fndecl)
6676 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6680 /* Now pushdecl the enum constants. */
6681 for (parm = others; parm; parm = next)
6683 next = TREE_CHAIN (parm);
6684 if (DECL_NAME (parm) == 0)
6686 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6688 else if (TREE_CODE (parm) != PARM_DECL)
6692 storetags (chainon (parmtags, gettags ()));
6696 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6697 each with a parm name as the TREE_VALUE.
6699 PARMDECLS is a chain of declarations for parameters.
6700 Warning! It can also contain CONST_DECLs which are not parameters
6701 but are names of enumerators of any enum types
6702 declared among the parameters.
6704 First match each formal parameter name with its declaration.
6705 Associate decls with the names and store the decls
6706 into the TREE_PURPOSE slots. */
6708 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6709 DECL_RESULT (parm) = 0;
6711 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6713 register tree tail, found = NULL;
6715 if (TREE_VALUE (parm) == 0)
6717 error_with_decl (fndecl, "parameter name missing from parameter list");
6718 TREE_PURPOSE (parm) = 0;
6722 /* See if any of the parmdecls specifies this parm by name.
6723 Ignore any enumerator decls. */
6724 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6725 if (DECL_NAME (tail) == TREE_VALUE (parm)
6726 && TREE_CODE (tail) == PARM_DECL)
6732 /* If declaration already marked, we have a duplicate name.
6733 Complain, and don't use this decl twice. */
6734 if (found && DECL_RESULT (found) != 0)
6736 error_with_decl (found, "multiple parameters named `%s'");
6740 /* If the declaration says "void", complain and ignore it. */
6741 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6743 error_with_decl (found, "parameter `%s' declared void");
6744 TREE_TYPE (found) = integer_type_node;
6745 DECL_ARG_TYPE (found) = integer_type_node;
6746 layout_decl (found, 0);
6749 /* Traditionally, a parm declared float is actually a double. */
6750 if (found && flag_traditional
6751 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6753 TREE_TYPE (found) = double_type_node;
6754 DECL_ARG_TYPE (found) = double_type_node;
6755 layout_decl (found, 0);
6758 /* If no declaration found, default to int. */
6761 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6763 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6764 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6765 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6767 warning_with_decl (found, "type of `%s' defaults to `int'");
6771 TREE_PURPOSE (parm) = found;
6773 /* Mark this decl as "already found" -- see test, above.
6774 It is safe to use DECL_RESULT for this
6775 since it is not used in PARM_DECLs or CONST_DECLs. */
6776 DECL_RESULT (found) = error_mark_node;
6779 /* Put anything which is on the parmdecls chain and which is
6780 not a PARM_DECL onto the list NONPARMS. (The types of
6781 non-parm things which might appear on the list include
6782 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6783 any actual PARM_DECLs not matched with any names. */
6786 for (parm = parmdecls; parm; )
6788 tree next = TREE_CHAIN (parm);
6789 TREE_CHAIN (parm) = 0;
6791 if (TREE_CODE (parm) != PARM_DECL)
6792 nonparms = chainon (nonparms, parm);
6795 /* Complain about args with incomplete types. */
6796 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6798 error_with_decl (parm, "parameter `%s' has incomplete type");
6799 TREE_TYPE (parm) = error_mark_node;
6802 if (DECL_RESULT (parm) == 0)
6804 error_with_decl (parm,
6805 "declaration for parameter `%s' but no such parameter");
6806 /* Pretend the parameter was not missing.
6807 This gets us to a standard state and minimizes
6808 further error messages. */
6810 = chainon (specparms,
6811 tree_cons (parm, NULL_TREE, NULL_TREE));
6818 /* Chain the declarations together in the order of the list of names. */
6819 /* Store that chain in the function decl, replacing the list of names. */
6821 DECL_ARGUMENTS (fndecl) = 0;
6824 for (last = 0; parm; parm = TREE_CHAIN (parm))
6825 if (TREE_PURPOSE (parm))
6828 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6830 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6831 last = TREE_PURPOSE (parm);
6832 TREE_CHAIN (last) = 0;
6836 /* If there was a previous prototype,
6837 set the DECL_ARG_TYPE of each argument according to
6838 the type previously specified, and report any mismatches. */
6840 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6843 for (parm = DECL_ARGUMENTS (fndecl),
6844 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6845 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6846 != void_type_node));
6847 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6849 if (parm == 0 || type == 0
6850 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6852 error ("number of arguments doesn't match prototype");
6853 error_with_file_and_line (current_function_prototype_file,
6854 current_function_prototype_line,
6855 "prototype declaration");
6858 /* Type for passing arg must be consistent
6859 with that declared for the arg. */
6860 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6862 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6863 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6865 /* Adjust argument to match prototype. E.g. a previous
6866 `int foo(float);' prototype causes
6867 `int foo(x) float x; {...}' to be treated like
6868 `int foo(float x) {...}'. This is particularly
6869 useful for argument types like uid_t. */
6870 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6871 #ifdef PROMOTE_PROTOTYPES
6872 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6873 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6874 && TYPE_PRECISION (TREE_TYPE (parm))
6875 < TYPE_PRECISION (integer_type_node))
6876 DECL_ARG_TYPE (parm) = integer_type_node;
6880 pedwarn ("promoted argument `%s' doesn't match prototype",
6881 IDENTIFIER_POINTER (DECL_NAME (parm)));
6882 warning_with_file_and_line
6883 (current_function_prototype_file,
6884 current_function_prototype_line,
6885 "prototype declaration");
6888 /* If -traditional, allow `int' argument to match
6889 `unsigned' prototype. */
6890 else if (! (flag_traditional
6891 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6892 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6894 error ("argument `%s' doesn't match prototype",
6895 IDENTIFIER_POINTER (DECL_NAME (parm)));
6896 error_with_file_and_line (current_function_prototype_file,
6897 current_function_prototype_line,
6898 "prototype declaration");
6902 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6905 /* Otherwise, create a prototype that would match. */
6909 tree actual = 0, last = 0, type;
6911 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6913 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6916 TREE_CHAIN (last) = type;
6921 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6923 TREE_CHAIN (last) = type;
6927 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6928 of the type of this function, but we need to avoid having this
6929 affect the types of other similarly-typed functions, so we must
6930 first force the generation of an identical (but separate) type
6931 node for the relevant function type. The new node we create
6932 will be a variant of the main variant of the original function
6935 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6937 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6940 /* Now store the final chain of decls for the arguments
6941 as the decl-chain of the current lexical scope.
6942 Put the enumerators in as well, at the front so that
6943 DECL_ARGUMENTS is not modified. */
6945 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6948 /* Make sure the binding level for the top of the function body
6949 gets a BLOCK if there are any in the function.
6950 Otherwise, the dbx output is wrong. */
6952 keep_next_if_subblocks = 1;
6954 /* ??? This might be an improvement,
6955 but needs to be thought about some more. */
6957 keep_next_level_flag = 1;
6960 /* Write a record describing this function definition to the prototypes
6961 file (if requested). */
6963 gen_aux_info_record (fndecl, 1, 0, prototype);
6965 /* Initialize the RTL code for the function. */
6967 init_function_start (fndecl, input_filename, lineno);
6969 /* If this is a varargs function, inform function.c. */
6971 if (c_function_varargs)
6974 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6976 declare_function_name ();
6978 /* Set up parameters and prepare for return, for the function. */
6980 expand_function_start (fndecl, 0);
6982 /* If this function is `main', emit a call to `__main'
6983 to run global initializers, etc. */
6984 if (DECL_NAME (fndecl)
6985 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6986 && DECL_CONTEXT (fndecl) == NULL_TREE)
6987 expand_main_function ();
6990 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6991 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6992 stands for an ellipsis in the identifier list.
6994 PARMLIST is the data returned by get_parm_info for the
6995 parmlist that follows the semicolon.
6997 We return a value of the same sort that get_parm_info returns,
6998 except that it describes the combination of identifiers and parmlist. */
7001 combine_parm_decls (specparms, parmlist, void_at_end)
7002 tree specparms, parmlist;
7005 register tree fndecl = current_function_decl;
7008 tree parmdecls = TREE_PURPOSE (parmlist);
7010 /* This is a chain of any other decls that came in among the parm
7011 declarations. They were separated already by get_parm_info,
7012 so we just need to keep them separate. */
7013 tree nonparms = TREE_VALUE (parmlist);
7017 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
7018 DECL_RESULT (parm) = 0;
7020 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
7022 register tree tail, found = NULL;
7024 /* See if any of the parmdecls specifies this parm by name. */
7025 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
7026 if (DECL_NAME (tail) == TREE_VALUE (parm))
7032 /* If declaration already marked, we have a duplicate name.
7033 Complain, and don't use this decl twice. */
7034 if (found && DECL_RESULT (found) != 0)
7036 error_with_decl (found, "multiple parameters named `%s'");
7040 /* If the declaration says "void", complain and ignore it. */
7041 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7043 error_with_decl (found, "parameter `%s' declared void");
7044 TREE_TYPE (found) = integer_type_node;
7045 DECL_ARG_TYPE (found) = integer_type_node;
7046 layout_decl (found, 0);
7049 /* Traditionally, a parm declared float is actually a double. */
7050 if (found && flag_traditional
7051 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7053 TREE_TYPE (found) = double_type_node;
7054 DECL_ARG_TYPE (found) = double_type_node;
7055 layout_decl (found, 0);
7058 /* If no declaration found, default to int. */
7061 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7063 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7064 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7065 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7066 error_with_decl (found, "type of parameter `%s' is not declared");
7070 TREE_PURPOSE (parm) = found;
7072 /* Mark this decl as "already found" -- see test, above.
7073 It is safe to use DECL_RESULT for this
7074 since it is not used in PARM_DECLs or CONST_DECLs. */
7075 DECL_RESULT (found) = error_mark_node;
7078 /* Complain about any actual PARM_DECLs not matched with any names. */
7080 for (parm = parmdecls; parm; )
7082 tree next = TREE_CHAIN (parm);
7083 TREE_CHAIN (parm) = 0;
7085 /* Complain about args with incomplete types. */
7086 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7088 error_with_decl (parm, "parameter `%s' has incomplete type");
7089 TREE_TYPE (parm) = error_mark_node;
7092 if (DECL_RESULT (parm) == 0)
7094 error_with_decl (parm,
7095 "declaration for parameter `%s' but no such parameter");
7096 /* Pretend the parameter was not missing.
7097 This gets us to a standard state and minimizes
7098 further error messages. */
7100 = chainon (specparms,
7101 tree_cons (parm, NULL_TREE, NULL_TREE));
7107 /* Chain the declarations together in the order of the list of names.
7108 At the same time, build up a list of their types, in reverse order. */
7114 for (last = 0; parm; parm = TREE_CHAIN (parm))
7115 if (TREE_PURPOSE (parm))
7118 parmdecls = TREE_PURPOSE (parm);
7120 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7121 last = TREE_PURPOSE (parm);
7122 TREE_CHAIN (last) = 0;
7124 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7129 return saveable_tree_cons (parmdecls, nonparms,
7130 nreverse (saveable_tree_cons (NULL_TREE,
7134 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7137 /* Finish up a function declaration and compile that function
7138 all the way to assembler language output. The free the storage
7139 for the function definition.
7141 This is called after parsing the body of the function definition.
7143 NESTED is nonzero if the function being finished is nested in another. */
7146 finish_function (nested)
7149 register tree fndecl = current_function_decl;
7151 /* TREE_READONLY (fndecl) = 1;
7152 This caused &foo to be of type ptr-to-const-function
7153 which then got a warning when stored in a ptr-to-function variable. */
7156 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7158 /* Must mark the RESULT_DECL as being in this function. */
7160 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7162 /* Obey `register' declarations if `setjmp' is called in this fn. */
7163 if (flag_traditional && current_function_calls_setjmp)
7165 setjmp_protect (DECL_INITIAL (fndecl));
7166 setjmp_protect_args ();
7169 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7171 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7172 != integer_type_node)
7174 /* You would expect the sense of this test to be the other way
7175 around, but if warn_main is set, we will already have warned,
7176 so this would be a duplicate. This is the warning you get
7177 in some environments even if you *don't* ask for it, because
7178 these are environments where it may be more of a problem than
7181 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7185 #ifdef DEFAULT_MAIN_RETURN
7186 /* Make it so that `main' always returns success by default. */
7187 DEFAULT_MAIN_RETURN;
7192 /* Generate rtl for function exit. */
7193 expand_function_end (input_filename, lineno, 0);
7195 /* So we can tell if jump_optimize sets it to 1. */
7198 /* Run the optimizers and output the assembler code for this function. */
7199 rest_of_compilation (fndecl);
7201 current_function_returns_null |= can_reach_end;
7203 if (warn_missing_noreturn
7204 && !TREE_THIS_VOLATILE (fndecl)
7205 && !current_function_returns_null
7206 && !current_function_returns_value)
7207 warning ("function might be possible candidate for attribute `noreturn'");
7209 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7210 warning ("`noreturn' function does return");
7211 else if (warn_return_type && can_reach_end
7212 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7213 /* If this function returns non-void and control can drop through,
7215 warning ("control reaches end of non-void function");
7216 /* With just -W, complain only if function returns both with
7217 and without a value. */
7218 else if (extra_warnings
7219 && current_function_returns_value && current_function_returns_null)
7220 warning ("this function may return with or without a value");
7222 /* If requested, warn about function definitions where the function will
7223 return a value (usually of some struct or union type) which itself will
7224 take up a lot of stack space. */
7226 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7228 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7232 register tree ret_type_size = TYPE_SIZE (ret_type);
7234 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7237 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7239 if (units > larger_than_size)
7240 warning_with_decl (fndecl,
7241 "size of return value of `%s' is %u bytes",
7247 /* Free all the tree nodes making up this function. */
7248 /* Switch back to allocating nodes permanently
7249 until we start another function. */
7251 permanent_allocation (1);
7253 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7255 /* Stop pointing to the local nodes about to be freed. */
7256 /* But DECL_INITIAL must remain nonzero so we know this
7257 was an actual function definition. */
7258 /* For a nested function, this is done in pop_c_function_context. */
7259 /* If rest_of_compilation set this to 0, leave it 0. */
7260 if (DECL_INITIAL (fndecl) != 0)
7261 DECL_INITIAL (fndecl) = error_mark_node;
7262 DECL_ARGUMENTS (fndecl) = 0;
7265 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7267 #ifndef ASM_OUTPUT_CONSTRUCTOR
7268 if (! flag_gnu_linker)
7269 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7272 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7274 if (DECL_STATIC_DESTRUCTOR (fndecl))
7276 #ifndef ASM_OUTPUT_DESTRUCTOR
7277 if (! flag_gnu_linker)
7278 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7281 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7286 /* Let the error reporting routines know that we're outside a
7287 function. For a nested function, this value is used in
7288 pop_c_function_context and then reset via pop_function_context. */
7289 current_function_decl = NULL;
7293 /* Save and restore the variables in this file and elsewhere
7294 that keep track of the progress of compilation of the current function.
7295 Used for nested functions. */
7299 struct c_function *next;
7301 tree shadowed_labels;
7304 int warn_about_return_type;
7306 struct binding_level *binding_level;
7309 struct c_function *c_function_chain;
7311 /* Save and reinitialize the variables
7312 used during compilation of a C function. */
7315 push_c_function_context ()
7317 struct c_function *p
7318 = (struct c_function *) xmalloc (sizeof (struct c_function));
7321 pedwarn ("ANSI C forbids nested functions");
7323 push_function_context ();
7325 p->next = c_function_chain;
7326 c_function_chain = p;
7328 p->named_labels = named_labels;
7329 p->shadowed_labels = shadowed_labels;
7330 p->returns_value = current_function_returns_value;
7331 p->returns_null = current_function_returns_null;
7332 p->warn_about_return_type = warn_about_return_type;
7333 p->extern_inline = current_extern_inline;
7334 p->binding_level = current_binding_level;
7337 /* Restore the variables used during compilation of a C function. */
7340 pop_c_function_context ()
7342 struct c_function *p = c_function_chain;
7345 /* Bring back all the labels that were shadowed. */
7346 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7347 if (DECL_NAME (TREE_VALUE (link)) != 0)
7348 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7349 = TREE_VALUE (link);
7351 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7353 /* Stop pointing to the local nodes about to be freed. */
7354 /* But DECL_INITIAL must remain nonzero so we know this
7355 was an actual function definition. */
7356 DECL_INITIAL (current_function_decl) = error_mark_node;
7357 DECL_ARGUMENTS (current_function_decl) = 0;
7360 pop_function_context ();
7362 c_function_chain = p->next;
7364 named_labels = p->named_labels;
7365 shadowed_labels = p->shadowed_labels;
7366 current_function_returns_value = p->returns_value;
7367 current_function_returns_null = p->returns_null;
7368 warn_about_return_type = p->warn_about_return_type;
7369 current_extern_inline = p->extern_inline;
7370 current_binding_level = p->binding_level;
7375 /* integrate_decl_tree calls this function, but since we don't use the
7376 DECL_LANG_SPECIFIC field, this is a no-op. */
7379 copy_lang_decl (node)
7380 tree node ATTRIBUTE_UNUSED;