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 traditional constructs whose meanings changed in ANSI C. */
520 int warn_traditional;
522 /* Nonzero means warn about sizeof(function) or addition/subtraction
523 of function pointers. */
525 int warn_pointer_arith;
527 /* Nonzero means warn for non-prototype function decls
528 or non-prototyped defs without previous prototype. */
530 int warn_strict_prototypes;
532 /* Nonzero means warn for any global function def
533 without separate previous prototype decl. */
535 int warn_missing_prototypes;
537 /* Nonzero means warn for any global function def
538 without separate previous decl. */
540 int warn_missing_declarations;
542 /* Nonzero means warn about multiple (redundant) decls for the same single
543 variable or function. */
545 int warn_redundant_decls = 0;
547 /* Nonzero means warn about extern declarations of objects not at
548 file-scope level and about *all* declarations of functions (whether
549 extern or static) not at file-scope level. Note that we exclude
550 implicit function declarations. To get warnings about those, use
553 int warn_nested_externs = 0;
555 /* Warn about *printf or *scanf format/argument anomalies. */
559 /* Warn about a subscript that has type char. */
561 int warn_char_subscripts = 0;
563 /* Warn if a type conversion is done that might have confusing results. */
567 /* Warn if adding () is suggested. */
569 int warn_parentheses;
571 /* Warn if initializer is not completely bracketed. */
573 int warn_missing_braces;
575 /* Warn if main is suspicious. */
579 /* Warn about #pragma directives that are not recognised. */
581 int warn_unknown_pragmas = 0; /* Tri state variable. */
583 /* Warn about comparison of signed and unsigned values.
584 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
586 int warn_sign_compare = -1;
588 /* Nonzero means warn about use of multicharacter literals. */
590 int warn_multichar = 1;
592 /* Nonzero means `$' can be in an identifier. */
594 #ifndef DOLLARS_IN_IDENTIFIERS
595 #define DOLLARS_IN_IDENTIFIERS 1
597 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
599 /* Decode the string P as a language-specific option for C.
600 Return the number of strings consumed. */
603 c_decode_option (argc, argv)
604 int argc ATTRIBUTE_UNUSED;
607 int strings_processed;
610 if (! cpp_initialized)
612 cpp_reader_init (&parse_in);
613 parse_in.data = &parse_options;
614 cpp_options_init (&parse_options);
617 strings_processed = cpp_handle_option (&parse_in, argc, argv);
619 strings_processed = 0;
620 #endif /* ! USE_CPPLIB */
622 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
624 flag_traditional = 1;
625 flag_writable_strings = 1;
627 else if (!strcmp (p, "-fallow-single-precision"))
628 flag_allow_single_precision = 1;
629 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
634 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
638 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
642 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
644 flag_traditional = 0;
645 flag_writable_strings = 0;
647 else if (!strcmp (p, "-fdollars-in-identifiers"))
648 dollars_in_ident = 1;
649 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
650 dollars_in_ident = 0;
651 else if (!strcmp (p, "-fsigned-char"))
652 flag_signed_char = 1;
653 else if (!strcmp (p, "-funsigned-char"))
654 flag_signed_char = 0;
655 else if (!strcmp (p, "-fno-signed-char"))
656 flag_signed_char = 0;
657 else if (!strcmp (p, "-fno-unsigned-char"))
658 flag_signed_char = 1;
659 else if (!strcmp (p, "-fsigned-bitfields")
660 || !strcmp (p, "-fno-unsigned-bitfields"))
662 flag_signed_bitfields = 1;
663 explicit_flag_signed_bitfields = 1;
665 else if (!strcmp (p, "-funsigned-bitfields")
666 || !strcmp (p, "-fno-signed-bitfields"))
668 flag_signed_bitfields = 0;
669 explicit_flag_signed_bitfields = 1;
671 else if (!strcmp (p, "-fshort-enums"))
672 flag_short_enums = 1;
673 else if (!strcmp (p, "-fno-short-enums"))
674 flag_short_enums = 0;
675 else if (!strcmp (p, "-fcond-mismatch"))
676 flag_cond_mismatch = 1;
677 else if (!strcmp (p, "-fno-cond-mismatch"))
678 flag_cond_mismatch = 0;
679 else if (!strcmp (p, "-fshort-double"))
680 flag_short_double = 1;
681 else if (!strcmp (p, "-fno-short-double"))
682 flag_short_double = 0;
683 else if (!strcmp (p, "-fasm"))
685 else if (!strcmp (p, "-fno-asm"))
687 else if (!strcmp (p, "-fbuiltin"))
689 else if (!strcmp (p, "-fno-builtin"))
691 else if (!strcmp (p, "-fno-ident"))
693 else if (!strcmp (p, "-fident"))
695 else if (!strcmp (p, "-ansi"))
696 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
697 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
698 mesg_implicit_function_declaration = 2;
699 else if (!strcmp (p, "-Wimplicit-function-declaration"))
700 mesg_implicit_function_declaration = 1;
701 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
702 mesg_implicit_function_declaration = 0;
703 else if (!strcmp (p, "-Wimplicit-int"))
704 warn_implicit_int = 1;
705 else if (!strcmp (p, "-Wno-implicit-int"))
706 warn_implicit_int = 0;
707 else if (!strcmp (p, "-Wimplicit"))
709 warn_implicit_int = 1;
710 if (mesg_implicit_function_declaration != 2)
711 mesg_implicit_function_declaration = 1;
713 else if (!strcmp (p, "-Wno-implicit"))
714 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
715 else if (!strcmp (p, "-Wlong-long"))
717 else if (!strcmp (p, "-Wno-long-long"))
719 else if (!strcmp (p, "-Wwrite-strings"))
720 flag_const_strings = 1;
721 else if (!strcmp (p, "-Wno-write-strings"))
722 flag_const_strings = 0;
723 else if (!strcmp (p, "-Wcast-qual"))
725 else if (!strcmp (p, "-Wno-cast-qual"))
727 else if (!strcmp (p, "-Wbad-function-cast"))
728 warn_bad_function_cast = 1;
729 else if (!strcmp (p, "-Wno-bad-function-cast"))
730 warn_bad_function_cast = 0;
731 else if (!strcmp (p, "-Wpointer-arith"))
732 warn_pointer_arith = 1;
733 else if (!strcmp (p, "-Wno-pointer-arith"))
734 warn_pointer_arith = 0;
735 else if (!strcmp (p, "-Wstrict-prototypes"))
736 warn_strict_prototypes = 1;
737 else if (!strcmp (p, "-Wno-strict-prototypes"))
738 warn_strict_prototypes = 0;
739 else if (!strcmp (p, "-Wmissing-prototypes"))
740 warn_missing_prototypes = 1;
741 else if (!strcmp (p, "-Wno-missing-prototypes"))
742 warn_missing_prototypes = 0;
743 else if (!strcmp (p, "-Wmissing-declarations"))
744 warn_missing_declarations = 1;
745 else if (!strcmp (p, "-Wno-missing-declarations"))
746 warn_missing_declarations = 0;
747 else if (!strcmp (p, "-Wredundant-decls"))
748 warn_redundant_decls = 1;
749 else if (!strcmp (p, "-Wno-redundant-decls"))
750 warn_redundant_decls = 0;
751 else if (!strcmp (p, "-Wnested-externs"))
752 warn_nested_externs = 1;
753 else if (!strcmp (p, "-Wno-nested-externs"))
754 warn_nested_externs = 0;
755 else if (!strcmp (p, "-Wtraditional"))
756 warn_traditional = 1;
757 else if (!strcmp (p, "-Wno-traditional"))
758 warn_traditional = 0;
759 else if (!strcmp (p, "-Wformat"))
761 else if (!strcmp (p, "-Wno-format"))
763 else if (!strcmp (p, "-Wchar-subscripts"))
764 warn_char_subscripts = 1;
765 else if (!strcmp (p, "-Wno-char-subscripts"))
766 warn_char_subscripts = 0;
767 else if (!strcmp (p, "-Wconversion"))
769 else if (!strcmp (p, "-Wno-conversion"))
771 else if (!strcmp (p, "-Wparentheses"))
772 warn_parentheses = 1;
773 else if (!strcmp (p, "-Wno-parentheses"))
774 warn_parentheses = 0;
775 else if (!strcmp (p, "-Wreturn-type"))
776 warn_return_type = 1;
777 else if (!strcmp (p, "-Wno-return-type"))
778 warn_return_type = 0;
779 else if (!strcmp (p, "-Wcomment"))
780 ; /* cpp handles this one. */
781 else if (!strcmp (p, "-Wno-comment"))
782 ; /* cpp handles this one. */
783 else if (!strcmp (p, "-Wcomments"))
784 ; /* cpp handles this one. */
785 else if (!strcmp (p, "-Wno-comments"))
786 ; /* cpp handles this one. */
787 else if (!strcmp (p, "-Wtrigraphs"))
788 ; /* cpp handles this one. */
789 else if (!strcmp (p, "-Wno-trigraphs"))
790 ; /* cpp handles this one. */
791 else if (!strcmp (p, "-Wundef"))
792 ; /* cpp handles this one. */
793 else if (!strcmp (p, "-Wno-undef"))
794 ; /* cpp handles this one. */
795 else if (!strcmp (p, "-Wimport"))
796 ; /* cpp handles this one. */
797 else if (!strcmp (p, "-Wno-import"))
798 ; /* cpp handles this one. */
799 else if (!strcmp (p, "-Wmissing-braces"))
800 warn_missing_braces = 1;
801 else if (!strcmp (p, "-Wno-missing-braces"))
802 warn_missing_braces = 0;
803 else if (!strcmp (p, "-Wmain"))
805 else if (!strcmp (p, "-Wno-main"))
807 else if (!strcmp (p, "-Wsign-compare"))
808 warn_sign_compare = 1;
809 else if (!strcmp (p, "-Wno-sign-compare"))
810 warn_sign_compare = 0;
811 else if (!strcmp (p, "-Wmultichar"))
813 else if (!strcmp (p, "-Wno-multichar"))
815 else if (!strcmp (p, "-Wunknown-pragmas"))
816 /* Set to greater than 1, so that even unknown pragmas in system
817 headers will be warned about. */
818 warn_unknown_pragmas = 2;
819 else if (!strcmp (p, "-Wno-unknown-pragmas"))
820 warn_unknown_pragmas = 0;
821 else if (!strcmp (p, "-Wall"))
823 /* We save the value of warn_uninitialized, since if they put
824 -Wuninitialized on the command line, we need to generate a
825 warning about not using it without also specifying -O. */
826 if (warn_uninitialized != 1)
827 warn_uninitialized = 2;
828 warn_implicit_int = 1;
829 mesg_implicit_function_declaration = 1;
830 warn_return_type = 1;
834 warn_char_subscripts = 1;
835 warn_parentheses = 1;
836 warn_missing_braces = 1;
837 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
838 it off only if it's not explicit. */
840 /* Only warn about unknown pragmas that are not in system headers. */
841 warn_unknown_pragmas = 1;
844 return strings_processed;
849 /* Hooks for print_node. */
852 print_lang_decl (file, node, indent)
853 FILE *file ATTRIBUTE_UNUSED;
854 tree node ATTRIBUTE_UNUSED;
855 int indent ATTRIBUTE_UNUSED;
860 print_lang_type (file, node, indent)
861 FILE *file ATTRIBUTE_UNUSED;
862 tree node ATTRIBUTE_UNUSED;
863 int indent ATTRIBUTE_UNUSED;
868 print_lang_identifier (file, node, indent)
873 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
874 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
875 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
876 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
877 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
878 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
881 /* Hook called at end of compilation to assume 1 elt
882 for a top-level array decl that wasn't complete before. */
885 finish_incomplete_decl (decl)
888 if (TREE_CODE (decl) == VAR_DECL)
890 tree type = TREE_TYPE (decl);
891 if (type != error_mark_node
892 && TREE_CODE (type) == ARRAY_TYPE
893 && TYPE_DOMAIN (type) == 0)
895 if (! DECL_EXTERNAL (decl))
896 warning_with_decl (decl, "array `%s' assumed to have one element");
898 complete_array_type (type, NULL_TREE, 1);
900 layout_decl (decl, 0);
905 /* Create a new `struct binding_level'. */
908 struct binding_level *
909 make_binding_level ()
912 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
915 /* Nonzero if we are currently in the global binding level. */
920 return current_binding_level == global_binding_level;
926 keep_next_level_flag = 1;
929 /* Nonzero if the current level needs to have a BLOCK made. */
934 return ((current_binding_level->keep_if_subblocks
935 && current_binding_level->blocks != 0)
936 || current_binding_level->keep
937 || current_binding_level->names != 0
938 || (current_binding_level->tags != 0
939 && !current_binding_level->tag_transparent));
942 /* Identify this binding level as a level of parameters.
943 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
944 But it turns out there is no way to pass the right value for
945 DEFINITION_FLAG, so we ignore it. */
948 declare_parm_level (definition_flag)
949 int definition_flag ATTRIBUTE_UNUSED;
951 current_binding_level->parm_flag = 1;
954 /* Nonzero if currently making parm declarations. */
959 return current_binding_level->parm_flag;
962 /* Enter a new binding level.
963 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
964 not for that of tags. */
967 pushlevel (tag_transparent)
970 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
972 /* If this is the top level of a function,
973 just make sure that NAMED_LABELS is 0. */
975 if (current_binding_level == global_binding_level)
980 /* Reuse or create a struct for this binding level. */
982 if (free_binding_level)
984 newlevel = free_binding_level;
985 free_binding_level = free_binding_level->level_chain;
989 newlevel = make_binding_level ();
992 /* Add this level to the front of the chain (stack) of levels that
995 *newlevel = clear_binding_level;
996 newlevel->tag_transparent
998 || (current_binding_level
999 ? current_binding_level->subblocks_tag_transparent
1001 newlevel->level_chain = current_binding_level;
1002 current_binding_level = newlevel;
1003 newlevel->keep = keep_next_level_flag;
1004 keep_next_level_flag = 0;
1005 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1006 keep_next_if_subblocks = 0;
1009 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1012 clear_limbo_values (block)
1017 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1018 if (DECL_NAME (tem) != 0)
1019 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1021 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1022 clear_limbo_values (tem);
1025 /* Exit a binding level.
1026 Pop the level off, and restore the state of the identifier-decl mappings
1027 that were in effect when this level was entered.
1029 If KEEP is nonzero, this level had explicit declarations, so
1030 and create a "block" (a BLOCK node) for the level
1031 to record its declarations and subblocks for symbol table output.
1033 If FUNCTIONBODY is nonzero, this level is the body of a function,
1034 so create a block as if KEEP were set and also clear out all
1037 If REVERSE is nonzero, reverse the order of decls before putting
1038 them into the BLOCK. */
1041 poplevel (keep, reverse, functionbody)
1047 /* The chain of decls was accumulated in reverse order.
1048 Put it into forward order, just for cleanliness. */
1050 tree tags = current_binding_level->tags;
1051 tree subblocks = current_binding_level->blocks;
1054 int block_previously_created;
1056 keep |= current_binding_level->keep;
1058 /* This warning is turned off because it causes warnings for
1059 declarations like `extern struct foo *x'. */
1061 /* Warn about incomplete structure types in this level. */
1062 for (link = tags; link; link = TREE_CHAIN (link))
1063 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1065 tree type = TREE_VALUE (link);
1067 switch (TREE_CODE (type))
1070 errmsg = "`struct %s' incomplete in scope ending here";
1073 errmsg = "`union %s' incomplete in scope ending here";
1076 errmsg = "`enum %s' incomplete in scope ending here";
1079 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1080 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1082 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1083 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1087 /* Get the decls in the order they were written.
1088 Usually current_binding_level->names is in reverse order.
1089 But parameter decls were previously put in forward order. */
1092 current_binding_level->names
1093 = decls = nreverse (current_binding_level->names);
1095 decls = current_binding_level->names;
1097 /* Output any nested inline functions within this block
1098 if they weren't already output. */
1100 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1101 if (TREE_CODE (decl) == FUNCTION_DECL
1102 && ! TREE_ASM_WRITTEN (decl)
1103 && DECL_INITIAL (decl) != 0
1104 && TREE_ADDRESSABLE (decl))
1106 /* If this decl was copied from a file-scope decl
1107 on account of a block-scope extern decl,
1108 propagate TREE_ADDRESSABLE to the file-scope decl.
1110 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1111 true, since then the decl goes through save_for_inline_copying. */
1112 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1113 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1114 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1115 else if (DECL_SAVED_INSNS (decl) != 0)
1117 push_function_context ();
1118 output_inline_function (decl);
1119 pop_function_context ();
1123 /* If there were any declarations or structure tags in that level,
1124 or if this level is a function body,
1125 create a BLOCK to record them for the life of this function. */
1128 block_previously_created = (current_binding_level->this_block != 0);
1129 if (block_previously_created)
1130 block = current_binding_level->this_block;
1131 else if (keep || functionbody
1132 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1133 block = make_node (BLOCK);
1136 BLOCK_VARS (block) = decls;
1137 BLOCK_TYPE_TAGS (block) = tags;
1138 BLOCK_SUBBLOCKS (block) = subblocks;
1139 remember_end_note (block);
1142 /* In each subblock, record that this is its superior. */
1144 for (link = subblocks; link; link = TREE_CHAIN (link))
1145 BLOCK_SUPERCONTEXT (link) = block;
1147 /* Clear out the meanings of the local variables of this level. */
1149 for (link = decls; link; link = TREE_CHAIN (link))
1151 if (DECL_NAME (link) != 0)
1153 /* If the ident. was used or addressed via a local extern decl,
1154 don't forget that fact. */
1155 if (DECL_EXTERNAL (link))
1157 if (TREE_USED (link))
1158 TREE_USED (DECL_NAME (link)) = 1;
1159 if (TREE_ADDRESSABLE (link))
1160 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1162 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1166 /* Restore all name-meanings of the outer levels
1167 that were shadowed by this level. */
1169 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1170 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1172 /* If the level being exited is the top level of a function,
1173 check over all the labels, and clear out the current
1174 (function local) meanings of their names. */
1178 clear_limbo_values (block);
1180 /* If this is the top level block of a function,
1181 the vars are the function's parameters.
1182 Don't leave them in the BLOCK because they are
1183 found in the FUNCTION_DECL instead. */
1185 BLOCK_VARS (block) = 0;
1187 /* Clear out the definitions of all label names,
1188 since their scopes end here,
1189 and add them to BLOCK_VARS. */
1191 for (link = named_labels; link; link = TREE_CHAIN (link))
1193 register tree label = TREE_VALUE (link);
1195 if (DECL_INITIAL (label) == 0)
1197 error_with_decl (label, "label `%s' used but not defined");
1198 /* Avoid crashing later. */
1199 define_label (input_filename, lineno,
1202 else if (warn_unused && !TREE_USED (label))
1203 warning_with_decl (label, "label `%s' defined but not used");
1204 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1206 /* Put the labels into the "variables" of the
1207 top-level block, so debugger can see them. */
1208 TREE_CHAIN (label) = BLOCK_VARS (block);
1209 BLOCK_VARS (block) = label;
1213 /* Pop the current level, and free the structure for reuse. */
1216 register struct binding_level *level = current_binding_level;
1217 current_binding_level = current_binding_level->level_chain;
1219 level->level_chain = free_binding_level;
1220 free_binding_level = level;
1223 /* Dispose of the block that we just made inside some higher level. */
1225 DECL_INITIAL (current_function_decl) = block;
1228 if (!block_previously_created)
1229 current_binding_level->blocks
1230 = chainon (current_binding_level->blocks, block);
1232 /* If we did not make a block for the level just exited,
1233 any blocks made for inner levels
1234 (since they cannot be recorded as subblocks in that level)
1235 must be carried forward so they will later become subblocks
1236 of something else. */
1238 current_binding_level->blocks
1239 = chainon (current_binding_level->blocks, subblocks);
1241 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1242 binding contour so that they point to the appropriate construct, i.e.
1243 either to the current FUNCTION_DECL node, or else to the BLOCK node
1244 we just constructed.
1246 Note that for tagged types whose scope is just the formal parameter
1247 list for some function type specification, we can't properly set
1248 their TYPE_CONTEXTs here, because we don't have a pointer to the
1249 appropriate FUNCTION_TYPE node readily available to us. For those
1250 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1251 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1252 node which will represent the "scope" for these "parameter list local"
1257 for (link = tags; link; link = TREE_CHAIN (link))
1258 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1260 for (link = tags; link; link = TREE_CHAIN (link))
1261 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1264 TREE_USED (block) = 1;
1268 /* Delete the node BLOCK from the current binding level.
1269 This is used for the block inside a stmt expr ({...})
1270 so that the block can be reinserted where appropriate. */
1273 delete_block (block)
1277 if (current_binding_level->blocks == block)
1278 current_binding_level->blocks = TREE_CHAIN (block);
1279 for (t = current_binding_level->blocks; t;)
1281 if (TREE_CHAIN (t) == block)
1282 TREE_CHAIN (t) = TREE_CHAIN (block);
1286 TREE_CHAIN (block) = NULL;
1287 /* Clear TREE_USED which is always set by poplevel.
1288 The flag is set again if insert_block is called. */
1289 TREE_USED (block) = 0;
1292 /* Insert BLOCK at the end of the list of subblocks of the
1293 current binding level. This is used when a BIND_EXPR is expanded,
1294 to handle the BLOCK node inside the BIND_EXPR. */
1297 insert_block (block)
1300 TREE_USED (block) = 1;
1301 current_binding_level->blocks
1302 = chainon (current_binding_level->blocks, block);
1305 /* Set the BLOCK node for the innermost scope
1306 (the one we are currently in). */
1310 register tree block;
1312 current_binding_level->this_block = block;
1318 register struct binding_level *newlevel;
1320 /* Reuse or create a struct for this binding level. */
1322 if (free_binding_level)
1324 newlevel = free_binding_level;
1325 free_binding_level = free_binding_level->level_chain;
1329 newlevel = make_binding_level ();
1332 /* Add this level to the front of the chain (stack) of label levels. */
1334 newlevel->level_chain = label_level_chain;
1335 label_level_chain = newlevel;
1337 newlevel->names = named_labels;
1338 newlevel->shadowed = shadowed_labels;
1340 shadowed_labels = 0;
1346 register struct binding_level *level = label_level_chain;
1349 /* Clear out the definitions of the declared labels in this level.
1350 Leave in the list any ordinary, non-declared labels. */
1351 for (link = named_labels, prev = 0; link;)
1353 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1355 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1357 error_with_decl (TREE_VALUE (link),
1358 "label `%s' used but not defined");
1359 /* Avoid crashing later. */
1360 define_label (input_filename, lineno,
1361 DECL_NAME (TREE_VALUE (link)));
1363 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1364 warning_with_decl (TREE_VALUE (link),
1365 "label `%s' defined but not used");
1366 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1368 /* Delete this element from the list. */
1369 link = TREE_CHAIN (link);
1371 TREE_CHAIN (prev) = link;
1373 named_labels = link;
1378 link = TREE_CHAIN (link);
1382 /* Bring back all the labels that were shadowed. */
1383 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1384 if (DECL_NAME (TREE_VALUE (link)) != 0)
1385 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1386 = TREE_VALUE (link);
1388 named_labels = chainon (named_labels, level->names);
1389 shadowed_labels = level->shadowed;
1391 /* Pop the current level, and free the structure for reuse. */
1392 label_level_chain = label_level_chain->level_chain;
1393 level->level_chain = free_binding_level;
1394 free_binding_level = level;
1397 /* Push a definition or a declaration of struct, union or enum tag "name".
1398 "type" should be the type node.
1399 We assume that the tag "name" is not already defined.
1401 Note that the definition may really be just a forward reference.
1402 In that case, the TYPE_SIZE will be zero. */
1405 pushtag (name, type)
1408 register struct binding_level *b;
1410 /* Find the proper binding level for this type tag. */
1412 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1417 /* Record the identifier as the type's name if it has none. */
1419 if (TYPE_NAME (type) == 0)
1420 TYPE_NAME (type) = name;
1423 if (b == global_binding_level)
1424 b->tags = perm_tree_cons (name, type, b->tags);
1426 b->tags = saveable_tree_cons (name, type, b->tags);
1428 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1429 tagged type we just added to the current binding level. This fake
1430 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1431 to output a representation of a tagged type, and it also gives
1432 us a convenient place to record the "scope start" address for the
1435 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1437 /* An approximation for now, so we can tell this is a function-scope tag.
1438 This will be updated in poplevel. */
1439 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1442 /* Handle when a new declaration NEWDECL
1443 has the same name as an old one OLDDECL
1444 in the same binding contour.
1445 Prints an error message if appropriate.
1447 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1448 Otherwise, return 0.
1450 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1451 and OLDDECL is in an outer binding level and should thus not be changed. */
1454 duplicate_decls (newdecl, olddecl, different_binding_level)
1455 register tree newdecl, olddecl;
1456 int different_binding_level;
1458 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1459 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1460 && DECL_INITIAL (newdecl) != 0);
1461 tree oldtype = TREE_TYPE (olddecl);
1462 tree newtype = TREE_TYPE (newdecl);
1465 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1466 DECL_MACHINE_ATTRIBUTES (newdecl)
1467 = merge_machine_decl_attributes (olddecl, newdecl);
1469 if (TREE_CODE (newtype) == ERROR_MARK
1470 || TREE_CODE (oldtype) == ERROR_MARK)
1473 /* New decl is completely inconsistent with the old one =>
1474 tell caller to replace the old one.
1475 This is always an error except in the case of shadowing a builtin. */
1476 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1478 if (TREE_CODE (olddecl) == FUNCTION_DECL
1479 && (DECL_BUILT_IN (olddecl)
1480 || DECL_BUILT_IN_NONANSI (olddecl)))
1482 /* If you declare a built-in or predefined function name as static,
1483 the old definition is overridden,
1484 but optionally warn this was a bad choice of name. */
1485 if (!TREE_PUBLIC (newdecl))
1489 else if (DECL_BUILT_IN (olddecl))
1490 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1492 warning_with_decl (newdecl, "shadowing library function `%s'");
1494 /* Likewise, if the built-in is not ansi, then programs can
1495 override it even globally without an error. */
1496 else if (! DECL_BUILT_IN (olddecl))
1497 warning_with_decl (newdecl,
1498 "library function `%s' declared as non-function");
1500 else if (DECL_BUILT_IN_NONANSI (olddecl))
1501 warning_with_decl (newdecl,
1502 "built-in function `%s' declared as non-function");
1504 warning_with_decl (newdecl,
1505 "built-in function `%s' declared as non-function");
1509 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1510 error_with_decl (olddecl, "previous declaration of `%s'");
1516 /* For real parm decl following a forward decl,
1517 return 1 so old decl will be reused. */
1518 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1519 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1522 /* The new declaration is the same kind of object as the old one.
1523 The declarations may partially match. Print warnings if they don't
1524 match enough. Ultimately, copy most of the information from the new
1525 decl to the old one, and keep using the old one. */
1527 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1528 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1529 && DECL_INITIAL (olddecl) == 0)
1530 /* If -traditional, avoid error for redeclaring fcn
1531 after implicit decl. */
1533 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1534 && DECL_BUILT_IN (olddecl))
1536 /* A function declaration for a built-in function. */
1537 if (!TREE_PUBLIC (newdecl))
1539 /* If you declare a built-in function name as static, the
1540 built-in definition is overridden,
1541 but optionally warn this was a bad choice of name. */
1543 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1544 /* Discard the old built-in function. */
1547 else if (!types_match)
1549 /* Accept the return type of the new declaration if same modes. */
1550 tree oldreturntype = TREE_TYPE (oldtype);
1551 tree newreturntype = TREE_TYPE (newtype);
1553 /* Make sure we put the new type in the same obstack as the old ones.
1554 If the old types are not both in the same obstack, use the
1556 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1557 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1560 push_obstacks_nochange ();
1561 end_temporary_allocation ();
1564 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1566 /* Function types may be shared, so we can't just modify
1567 the return type of olddecl's function type. */
1569 = build_function_type (newreturntype,
1570 TYPE_ARG_TYPES (oldtype));
1572 types_match = comptypes (newtype, trytype);
1576 /* Accept harmless mismatch in first argument type also.
1578 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1579 && TYPE_ARG_TYPES (oldtype) != 0
1580 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1581 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1582 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1583 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1585 /* Function types may be shared, so we can't just modify
1586 the return type of olddecl's function type. */
1588 = build_function_type (TREE_TYPE (oldtype),
1589 tree_cons (NULL_TREE,
1590 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1591 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1593 types_match = comptypes (newtype, trytype);
1597 if (! different_binding_level)
1598 TREE_TYPE (olddecl) = oldtype;
1604 /* If types don't match for a built-in, throw away the built-in. */
1605 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1609 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1610 && DECL_SOURCE_LINE (olddecl) == 0)
1612 /* A function declaration for a predeclared function
1613 that isn't actually built in. */
1614 if (!TREE_PUBLIC (newdecl))
1616 /* If you declare it as static, the
1617 default definition is overridden. */
1620 else if (!types_match)
1622 /* If the types don't match, preserve volatility indication.
1623 Later on, we will discard everything else about the
1624 default declaration. */
1625 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1628 /* Permit char *foo () to match void *foo (...) if not pedantic,
1629 if one of them came from a system header file. */
1630 else if (!types_match
1631 && TREE_CODE (olddecl) == FUNCTION_DECL
1632 && TREE_CODE (newdecl) == FUNCTION_DECL
1633 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1634 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1635 && (DECL_IN_SYSTEM_HEADER (olddecl)
1636 || DECL_IN_SYSTEM_HEADER (newdecl))
1637 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1638 && TYPE_ARG_TYPES (oldtype) == 0
1639 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1640 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1642 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1643 && TYPE_ARG_TYPES (newtype) == 0
1644 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1645 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1648 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1649 /* Make sure we keep void * as ret type, not char *. */
1650 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1651 TREE_TYPE (newdecl) = newtype = oldtype;
1653 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1654 we will come back here again. */
1655 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1657 else if (!types_match
1658 /* Permit char *foo (int, ...); followed by char *foo ();
1660 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1662 /* Return types must still match. */
1663 && comptypes (TREE_TYPE (oldtype),
1664 TREE_TYPE (newtype))
1665 && TYPE_ARG_TYPES (newtype) == 0))
1667 error_with_decl (newdecl, "conflicting types for `%s'");
1668 /* Check for function type mismatch
1669 involving an empty arglist vs a nonempty one. */
1670 if (TREE_CODE (olddecl) == FUNCTION_DECL
1671 && comptypes (TREE_TYPE (oldtype),
1672 TREE_TYPE (newtype))
1673 && ((TYPE_ARG_TYPES (oldtype) == 0
1674 && DECL_INITIAL (olddecl) == 0)
1676 (TYPE_ARG_TYPES (newtype) == 0
1677 && DECL_INITIAL (newdecl) == 0)))
1679 /* Classify the problem further. */
1680 register tree t = TYPE_ARG_TYPES (oldtype);
1682 t = TYPE_ARG_TYPES (newtype);
1683 for (; t; t = TREE_CHAIN (t))
1685 register tree type = TREE_VALUE (t);
1687 if (TREE_CHAIN (t) == 0
1688 && TYPE_MAIN_VARIANT (type) != void_type_node)
1690 error ("A parameter list with an ellipsis can't match");
1691 error ("an empty parameter name list declaration.");
1695 if (TYPE_MAIN_VARIANT (type) == float_type_node
1696 || C_PROMOTING_INTEGER_TYPE_P (type))
1698 error ("An argument type that has a default promotion");
1699 error ("can't match an empty parameter name list declaration.");
1704 error_with_decl (olddecl, "previous declaration of `%s'");
1708 errmsg = redeclaration_error_message (newdecl, olddecl);
1711 error_with_decl (newdecl, errmsg);
1712 error_with_decl (olddecl,
1713 ((DECL_INITIAL (olddecl)
1714 && current_binding_level == global_binding_level)
1715 ? "`%s' previously defined here"
1716 : "`%s' previously declared here"));
1718 else if (TREE_CODE (newdecl) == TYPE_DECL
1719 && (DECL_IN_SYSTEM_HEADER (olddecl)
1720 || DECL_IN_SYSTEM_HEADER (newdecl)))
1722 warning_with_decl (newdecl, "redefinition of `%s'");
1725 ((DECL_INITIAL (olddecl)
1726 && current_binding_level == global_binding_level)
1727 ? "`%s' previously defined here"
1728 : "`%s' previously declared here"));
1730 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1731 && DECL_INITIAL (olddecl) != 0
1732 && TYPE_ARG_TYPES (oldtype) == 0
1733 && TYPE_ARG_TYPES (newtype) != 0
1734 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1736 register tree type, parm;
1738 /* Prototype decl follows defn w/o prototype. */
1740 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1741 type = TYPE_ARG_TYPES (newtype),
1743 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1744 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1745 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1747 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1748 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1750 errmsg = "prototype for `%s' follows and number of arguments";
1753 /* Type for passing arg must be consistent
1754 with that declared for the arg. */
1755 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1756 /* If -traditional, allow `unsigned int' instead of `int'
1757 in the prototype. */
1758 && (! (flag_traditional
1759 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1760 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1762 errmsg = "prototype for `%s' follows and argument %d";
1768 error_with_decl (newdecl, errmsg, nargs);
1769 error_with_decl (olddecl,
1770 "doesn't match non-prototype definition here");
1774 warning_with_decl (newdecl, "prototype for `%s' follows");
1775 warning_with_decl (olddecl, "non-prototype definition here");
1778 /* Warn about mismatches in various flags. */
1781 /* Warn if function is now inline
1782 but was previously declared not inline and has been called. */
1783 if (TREE_CODE (olddecl) == FUNCTION_DECL
1784 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1785 && TREE_USED (olddecl))
1786 warning_with_decl (newdecl,
1787 "`%s' declared inline after being called");
1788 if (TREE_CODE (olddecl) == FUNCTION_DECL
1789 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1790 && DECL_INITIAL (olddecl) != 0)
1791 warning_with_decl (newdecl,
1792 "`%s' declared inline after its definition");
1794 /* If pedantic, warn when static declaration follows a non-static
1795 declaration. Otherwise, do so only for functions. */
1796 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1797 && TREE_PUBLIC (olddecl)
1798 && !TREE_PUBLIC (newdecl))
1799 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1801 /* Warn when const declaration follows a non-const
1802 declaration, but not for functions. */
1803 if (TREE_CODE (olddecl) != FUNCTION_DECL
1804 && !TREE_READONLY (olddecl)
1805 && TREE_READONLY (newdecl))
1806 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1807 /* These bits are logically part of the type, for variables.
1808 But not for functions
1809 (where qualifiers are not valid ANSI anyway). */
1810 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1811 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1812 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1813 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1817 /* Optionally warn about more than one declaration for the same name. */
1818 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1819 /* Don't warn about a function declaration
1820 followed by a definition. */
1821 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1822 && DECL_INITIAL (olddecl) == 0)
1823 /* Don't warn about extern decl followed by (tentative) definition. */
1824 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1826 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1827 warning_with_decl (olddecl, "previous declaration of `%s'");
1830 /* Copy all the DECL_... slots specified in the new decl
1831 except for any that we copy here from the old type.
1833 Past this point, we don't change OLDTYPE and NEWTYPE
1834 even if we change the types of NEWDECL and OLDDECL. */
1838 /* When copying info to olddecl, we store into write_olddecl
1839 instead. This allows us to avoid modifying olddecl when
1840 different_binding_level is true. */
1841 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1843 /* Make sure we put the new type in the same obstack as the old ones.
1844 If the old types are not both in the same obstack, use the permanent
1846 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1847 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1850 push_obstacks_nochange ();
1851 end_temporary_allocation ();
1854 /* Merge the data types specified in the two decls. */
1855 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1857 if (different_binding_level)
1859 = build_type_attribute_variant
1861 merge_attributes (TYPE_ATTRIBUTES (newtype),
1862 TYPE_ATTRIBUTES (oldtype)));
1865 = TREE_TYPE (olddecl)
1866 = common_type (newtype, oldtype);
1869 /* Lay the type out, unless already done. */
1870 if (oldtype != TREE_TYPE (newdecl))
1872 if (TREE_TYPE (newdecl) != error_mark_node)
1873 layout_type (TREE_TYPE (newdecl));
1874 if (TREE_CODE (newdecl) != FUNCTION_DECL
1875 && TREE_CODE (newdecl) != TYPE_DECL
1876 && TREE_CODE (newdecl) != CONST_DECL)
1877 layout_decl (newdecl, 0);
1881 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1882 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1883 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1884 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1885 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1888 /* Keep the old rtl since we can safely use it. */
1889 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1891 /* Merge the type qualifiers. */
1892 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1893 && !TREE_THIS_VOLATILE (newdecl))
1894 TREE_THIS_VOLATILE (write_olddecl) = 0;
1895 if (TREE_READONLY (newdecl))
1896 TREE_READONLY (write_olddecl) = 1;
1897 if (TREE_THIS_VOLATILE (newdecl))
1899 TREE_THIS_VOLATILE (write_olddecl) = 1;
1900 if (TREE_CODE (newdecl) == VAR_DECL)
1901 make_var_volatile (newdecl);
1904 /* Keep source location of definition rather than declaration. */
1905 /* When called with different_binding_level set, keep the old
1906 information so that meaningful diagnostics can be given. */
1907 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1908 && ! different_binding_level)
1910 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1911 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1914 /* Merge the unused-warning information. */
1915 if (DECL_IN_SYSTEM_HEADER (olddecl))
1916 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1917 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1918 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1920 /* Merge the initialization information. */
1921 /* When called with different_binding_level set, don't copy over
1922 DECL_INITIAL, so that we don't accidentally change function
1923 declarations into function definitions. */
1924 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1925 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1927 /* Merge the section attribute.
1928 We want to issue an error if the sections conflict but that must be
1929 done later in decl_attributes since we are called before attributes
1931 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1932 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1934 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1936 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1937 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1939 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1940 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1941 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1942 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1947 /* If cannot merge, then use the new type and qualifiers,
1948 and don't preserve the old rtl. */
1949 else if (! different_binding_level)
1951 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1952 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1953 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1954 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1957 /* Merge the storage class information. */
1958 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1959 /* For functions, static overrides non-static. */
1960 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1962 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1963 /* This is since we don't automatically
1964 copy the attributes of NEWDECL into OLDDECL. */
1965 /* No need to worry about different_binding_level here because
1966 then TREE_PUBLIC (newdecl) was true. */
1967 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1968 /* If this clears `static', clear it in the identifier too. */
1969 if (! TREE_PUBLIC (olddecl))
1970 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1972 if (DECL_EXTERNAL (newdecl))
1974 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1975 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1976 /* An extern decl does not override previous storage class. */
1977 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1978 if (! DECL_EXTERNAL (newdecl))
1979 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1983 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1984 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1987 /* If either decl says `inline', this fn is inline,
1988 unless its definition was passed already. */
1989 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1990 DECL_INLINE (olddecl) = 1;
1991 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1993 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1995 if (DECL_BUILT_IN (olddecl))
1997 /* Get rid of any built-in function if new arg types don't match it
1998 or if we have a function definition. */
1999 if (! types_match || new_is_definition)
2001 if (! different_binding_level)
2003 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2004 DECL_BUILT_IN (olddecl) = 0;
2009 /* If redeclaring a builtin function, and not a definition,
2010 it stays built in. */
2011 DECL_BUILT_IN (newdecl) = 1;
2012 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2015 /* Also preserve various other info from the definition. */
2016 else if (! new_is_definition)
2017 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2018 if (! new_is_definition)
2020 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2021 /* When called with different_binding_level set, don't copy over
2022 DECL_INITIAL, so that we don't accidentally change function
2023 declarations into function definitions. */
2024 if (! different_binding_level)
2025 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2026 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2027 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2028 if (DECL_INLINE (newdecl))
2029 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2032 if (different_binding_level)
2034 /* Don't output a duplicate symbol or debugging information for this
2037 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2038 just have two declarations without a definition. VAR_DECLs may need
2039 the same treatment, I'm not sure. */
2040 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2041 DECL_IGNORED_P (newdecl) = 1;
2043 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2047 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2048 But preserve OLDDECL's DECL_UID. */
2050 register unsigned olddecl_uid = DECL_UID (olddecl);
2052 bcopy ((char *) newdecl + sizeof (struct tree_common),
2053 (char *) olddecl + sizeof (struct tree_common),
2054 sizeof (struct tree_decl) - sizeof (struct tree_common));
2055 DECL_UID (olddecl) = olddecl_uid;
2058 /* NEWDECL contains the merged attribute lists.
2059 Update OLDDECL to be the same. */
2060 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2065 /* Record a decl-node X as belonging to the current lexical scope.
2066 Check for errors (such as an incompatible declaration for the same
2067 name already seen in the same scope).
2069 Returns either X or an old decl for the same name.
2070 If an old decl is returned, it may have been smashed
2071 to agree with what X says. */
2078 register tree name = DECL_NAME (x);
2079 register struct binding_level *b = current_binding_level;
2081 DECL_CONTEXT (x) = current_function_decl;
2082 /* A local extern declaration for a function doesn't constitute nesting.
2083 A local auto declaration does, since it's a forward decl
2084 for a nested function coming later. */
2085 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2086 && DECL_EXTERNAL (x))
2087 DECL_CONTEXT (x) = 0;
2089 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2090 && x != IDENTIFIER_IMPLICIT_DECL (name)
2091 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2092 && !DECL_IN_SYSTEM_HEADER (x))
2093 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2099 int different_binding_level = 0;
2101 t = lookup_name_current_level (name);
2102 /* Don't type check externs here when -traditional. This is so that
2103 code with conflicting declarations inside blocks will get warnings
2104 not errors. X11 for instance depends on this. */
2105 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2107 t = IDENTIFIER_GLOBAL_VALUE (name);
2108 /* Type decls at global scope don't conflict with externs declared
2109 inside lexical blocks. */
2110 if (t && TREE_CODE (t) == TYPE_DECL)
2112 different_binding_level = 1;
2114 if (t != 0 && t == error_mark_node)
2115 /* error_mark_node is 0 for a while during initialization! */
2118 error_with_decl (x, "`%s' used prior to declaration");
2123 file = DECL_SOURCE_FILE (t);
2124 line = DECL_SOURCE_LINE (t);
2127 /* If this decl is `static' and an implicit decl was seen previously,
2128 warn. But don't complain if -traditional,
2129 since traditional compilers don't complain. */
2130 if (! flag_traditional && TREE_PUBLIC (name)
2131 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2132 sets this for all functions. */
2133 && ! TREE_PUBLIC (x)
2134 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2135 /* We used to warn also for explicit extern followed by static,
2136 but sometimes you need to do it that way. */
2137 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2139 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2140 IDENTIFIER_POINTER (name));
2141 pedwarn_with_file_and_line
2142 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2143 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2144 "previous declaration of `%s'",
2145 IDENTIFIER_POINTER (name));
2146 TREE_THIS_VOLATILE (name) = 1;
2149 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2151 if (TREE_CODE (t) == PARM_DECL)
2153 /* Don't allow more than one "real" duplicate
2154 of a forward parm decl. */
2155 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2161 /* If we are processing a typedef statement, generate a whole new
2162 ..._TYPE node (which will be just an variant of the existing
2163 ..._TYPE node with identical properties) and then install the
2164 TYPE_DECL node generated to represent the typedef name as the
2165 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2167 The whole point here is to end up with a situation where each
2168 and every ..._TYPE node the compiler creates will be uniquely
2169 associated with AT MOST one node representing a typedef name.
2170 This way, even though the compiler substitutes corresponding
2171 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2172 early on, later parts of the compiler can always do the reverse
2173 translation and get back the corresponding typedef name. For
2176 typedef struct S MY_TYPE;
2179 Later parts of the compiler might only know that `object' was of
2180 type `struct S' if it were not for code just below. With this
2181 code however, later parts of the compiler see something like:
2183 struct S' == struct S
2184 typedef struct S' MY_TYPE;
2187 And they can then deduce (from the node for type struct S') that
2188 the original object declaration was:
2192 Being able to do this is important for proper support of protoize,
2193 and also for generating precise symbolic debugging information
2194 which takes full account of the programmer's (typedef) vocabulary.
2196 Obviously, we don't want to generate a duplicate ..._TYPE node if
2197 the TYPE_DECL node that we are now processing really represents a
2198 standard built-in type.
2200 Since all standard types are effectively declared at line zero
2201 in the source file, we can easily check to see if we are working
2202 on a standard type by checking the current value of lineno. */
2204 if (TREE_CODE (x) == TYPE_DECL)
2206 if (DECL_SOURCE_LINE (x) == 0)
2208 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2209 TYPE_NAME (TREE_TYPE (x)) = x;
2211 else if (TREE_TYPE (x) != error_mark_node
2212 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2214 tree tt = TREE_TYPE (x);
2215 DECL_ORIGINAL_TYPE (x) = tt;
2216 tt = build_type_copy (tt);
2222 /* Multiple external decls of the same identifier ought to match.
2223 Check against both global declarations (when traditional) and out of
2224 scope (limbo) block level declarations.
2226 We get warnings about inline functions where they are defined.
2227 Avoid duplicate warnings where they are used. */
2228 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2232 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2233 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2234 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2235 decl = IDENTIFIER_GLOBAL_VALUE (name);
2236 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2237 /* Decls in limbo are always extern, so no need to check that. */
2238 decl = IDENTIFIER_LIMBO_VALUE (name);
2242 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2243 /* If old decl is built-in, we already warned if we should. */
2244 && !DECL_BUILT_IN (decl))
2246 pedwarn_with_decl (x,
2247 "type mismatch with previous external decl");
2248 pedwarn_with_decl (decl, "previous external decl of `%s'");
2252 /* If a function has had an implicit declaration, and then is defined,
2253 make sure they are compatible. */
2255 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2256 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2257 && TREE_CODE (x) == FUNCTION_DECL
2258 && ! comptypes (TREE_TYPE (x),
2259 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2261 warning_with_decl (x, "type mismatch with previous implicit declaration");
2262 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2263 "previous implicit declaration of `%s'");
2266 /* In PCC-compatibility mode, extern decls of vars with no current decl
2267 take effect at top level no matter where they are. */
2268 if (flag_traditional && DECL_EXTERNAL (x)
2269 && lookup_name (name) == 0)
2271 tree type = TREE_TYPE (x);
2273 /* But don't do this if the type contains temporary nodes. */
2276 if (type == error_mark_node)
2278 if (! TREE_PERMANENT (type))
2280 warning_with_decl (x, "type of external `%s' is not global");
2281 /* By exiting the loop early, we leave TYPE nonzero,
2282 and thus prevent globalization of the decl. */
2285 else if (TREE_CODE (type) == FUNCTION_TYPE
2286 && TYPE_ARG_TYPES (type) != 0)
2287 /* The types might not be truly local,
2288 but the list of arg types certainly is temporary.
2289 Since prototypes are nontraditional,
2290 ok not to do the traditional thing. */
2292 type = TREE_TYPE (type);
2296 b = global_binding_level;
2299 /* This name is new in its binding level.
2300 Install the new declaration and return it. */
2301 if (b == global_binding_level)
2303 /* Install a global value. */
2305 /* If the first global decl has external linkage,
2306 warn if we later see static one. */
2307 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2308 TREE_PUBLIC (name) = 1;
2310 IDENTIFIER_GLOBAL_VALUE (name) = x;
2312 /* We no longer care about any previous block level declarations. */
2313 IDENTIFIER_LIMBO_VALUE (name) = 0;
2315 /* Don't forget if the function was used via an implicit decl. */
2316 if (IDENTIFIER_IMPLICIT_DECL (name)
2317 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2318 TREE_USED (x) = 1, TREE_USED (name) = 1;
2320 /* Don't forget if its address was taken in that way. */
2321 if (IDENTIFIER_IMPLICIT_DECL (name)
2322 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2323 TREE_ADDRESSABLE (x) = 1;
2325 /* Warn about mismatches against previous implicit decl. */
2326 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2327 /* If this real decl matches the implicit, don't complain. */
2328 && ! (TREE_CODE (x) == FUNCTION_DECL
2329 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2330 == integer_type_node)))
2331 pedwarn ("`%s' was previously implicitly declared to return `int'",
2332 IDENTIFIER_POINTER (name));
2334 /* If this decl is `static' and an `extern' was seen previously,
2335 that is erroneous. */
2336 if (TREE_PUBLIC (name)
2337 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2339 /* Okay to redeclare an ANSI built-in as static. */
2340 if (t != 0 && DECL_BUILT_IN (t))
2342 /* Okay to declare a non-ANSI built-in as anything. */
2343 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2345 /* Okay to have global type decl after an earlier extern
2346 declaration inside a lexical block. */
2347 else if (TREE_CODE (x) == TYPE_DECL)
2349 else if (IDENTIFIER_IMPLICIT_DECL (name))
2351 if (! TREE_THIS_VOLATILE (name))
2352 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2353 IDENTIFIER_POINTER (name));
2356 pedwarn ("`%s' was declared `extern' and later `static'",
2357 IDENTIFIER_POINTER (name));
2362 /* Here to install a non-global value. */
2363 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2364 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2365 IDENTIFIER_LOCAL_VALUE (name) = x;
2367 /* If this is an extern function declaration, see if we
2368 have a global definition or declaration for the function. */
2370 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2372 && TREE_CODE (x) == FUNCTION_DECL
2373 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2375 /* We have one. Their types must agree. */
2376 if (! comptypes (TREE_TYPE (x),
2377 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2378 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2381 /* Inner extern decl is inline if global one is.
2382 Copy enough to really inline it. */
2383 if (DECL_INLINE (oldglobal))
2385 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2386 DECL_INITIAL (x) = (current_function_decl == oldglobal
2387 ? 0 : DECL_INITIAL (oldglobal));
2388 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2389 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2390 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2391 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2392 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2393 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2395 /* Inner extern decl is built-in if global one is. */
2396 if (DECL_BUILT_IN (oldglobal))
2398 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2399 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2401 /* Keep the arg types from a file-scope fcn defn. */
2402 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2403 && DECL_INITIAL (oldglobal)
2404 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2405 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2409 #if 0 /* This case is probably sometimes the right thing to do. */
2410 /* If we have a local external declaration,
2411 then any file-scope declaration should not
2412 have been static. */
2413 if (oldlocal == 0 && oldglobal != 0
2414 && !TREE_PUBLIC (oldglobal)
2415 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2416 warning ("`%s' locally external but globally static",
2417 IDENTIFIER_POINTER (name));
2420 /* If we have a local external declaration,
2421 and no file-scope declaration has yet been seen,
2422 then if we later have a file-scope decl it must not be static. */
2424 && DECL_EXTERNAL (x)
2428 TREE_PUBLIC (name) = 1;
2430 /* Save this decl, so that we can do type checking against
2431 other decls after it falls out of scope.
2433 Only save it once. This prevents temporary decls created in
2434 expand_inline_function from being used here, since this
2435 will have been set when the inline function was parsed.
2436 It also helps give slightly better warnings. */
2437 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2438 IDENTIFIER_LIMBO_VALUE (name) = x;
2441 /* Warn if shadowing an argument at the top level of the body. */
2442 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2443 /* This warning doesn't apply to the parms of a nested fcn. */
2444 && ! current_binding_level->parm_flag
2445 /* Check that this is one level down from the parms. */
2446 && current_binding_level->level_chain->parm_flag
2447 /* Check that the decl being shadowed
2448 comes from the parm level, one level up. */
2449 && chain_member (oldlocal, current_binding_level->level_chain->names))
2451 if (TREE_CODE (oldlocal) == PARM_DECL)
2452 pedwarn ("declaration of `%s' shadows a parameter",
2453 IDENTIFIER_POINTER (name));
2455 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2456 IDENTIFIER_POINTER (name));
2459 /* Maybe warn if shadowing something else. */
2460 else if (warn_shadow && !DECL_EXTERNAL (x)
2461 /* No shadow warnings for internally generated vars. */
2462 && DECL_SOURCE_LINE (x) != 0
2463 /* No shadow warnings for vars made for inlining. */
2464 && ! DECL_FROM_INLINE (x))
2466 char *warnstring = 0;
2468 if (TREE_CODE (x) == PARM_DECL
2469 && current_binding_level->level_chain->parm_flag)
2470 /* Don't warn about the parm names in function declarator
2471 within a function declarator.
2472 It would be nice to avoid warning in any function
2473 declarator in a declaration, as opposed to a definition,
2474 but there is no way to tell it's not a definition. */
2476 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2477 warnstring = "declaration of `%s' shadows a parameter";
2478 else if (oldlocal != 0)
2479 warnstring = "declaration of `%s' shadows previous local";
2480 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2481 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2482 warnstring = "declaration of `%s' shadows global declaration";
2485 warning (warnstring, IDENTIFIER_POINTER (name));
2488 /* If storing a local value, there may already be one (inherited).
2489 If so, record it for restoration when this binding level ends. */
2491 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2494 /* Keep count of variables in this level with incomplete type. */
2495 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2499 /* Put decls on list in reverse order.
2500 We will reverse them later if necessary. */
2501 TREE_CHAIN (x) = b->names;
2507 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2510 pushdecl_top_level (x)
2514 register struct binding_level *b = current_binding_level;
2516 current_binding_level = global_binding_level;
2518 current_binding_level = b;
2522 /* Generate an implicit declaration for identifier FUNCTIONID
2523 as a function of type int (). Print a warning if appropriate. */
2526 implicitly_declare (functionid)
2530 int traditional_warning = 0;
2531 /* Only one "implicit declaration" warning per identifier. */
2532 int implicit_warning;
2534 /* Save the decl permanently so we can warn if definition follows. */
2535 push_obstacks_nochange ();
2536 end_temporary_allocation ();
2538 /* We used to reuse an old implicit decl here,
2539 but this loses with inline functions because it can clobber
2540 the saved decl chains. */
2541 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2542 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2544 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2546 /* Warn of implicit decl following explicit local extern decl.
2547 This is probably a program designed for traditional C. */
2548 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2549 traditional_warning = 1;
2551 /* Warn once of an implicit declaration. */
2552 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2554 DECL_EXTERNAL (decl) = 1;
2555 TREE_PUBLIC (decl) = 1;
2557 /* Record that we have an implicit decl and this is it. */
2558 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2560 /* ANSI standard says implicit declarations are in the innermost block.
2561 So we record the decl in the standard fashion.
2562 If flag_traditional is set, pushdecl does it top-level. */
2565 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2566 maybe_objc_check_decl (decl);
2568 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2570 if (mesg_implicit_function_declaration && implicit_warning)
2572 if (mesg_implicit_function_declaration == 2)
2573 error ("implicit declaration of function `%s'",
2574 IDENTIFIER_POINTER (functionid));
2576 warning ("implicit declaration of function `%s'",
2577 IDENTIFIER_POINTER (functionid));
2579 else if (warn_traditional && traditional_warning)
2580 warning ("function `%s' was previously declared within a block",
2581 IDENTIFIER_POINTER (functionid));
2583 /* Write a record describing this implicit function declaration to the
2584 prototypes file (if requested). */
2586 gen_aux_info_record (decl, 0, 1, 0);
2593 /* Return zero if the declaration NEWDECL is valid
2594 when the declaration OLDDECL (assumed to be for the same name)
2595 has already been seen.
2596 Otherwise return an error message format string with a %s
2597 where the identifier should go. */
2600 redeclaration_error_message (newdecl, olddecl)
2601 tree newdecl, olddecl;
2603 if (TREE_CODE (newdecl) == TYPE_DECL)
2605 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2607 /* pushdecl creates distinct types for TYPE_DECLs by calling
2608 build_type_copy, so the above comparison generally fails. We do
2609 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2610 is equivalent to what this code used to do before the build_type_copy
2611 call. The variant type distinction should not matter for traditional
2612 code, because it doesn't have type qualifiers. */
2613 if (flag_traditional
2614 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2616 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2618 return "redefinition of `%s'";
2620 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2622 /* Declarations of functions can insist on internal linkage
2623 but they can't be inconsistent with internal linkage,
2624 so there can be no error on that account.
2625 However defining the same name twice is no good. */
2626 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2627 /* However, defining once as extern inline and a second
2628 time in another way is ok. */
2629 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2630 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2631 return "redefinition of `%s'";
2634 else if (current_binding_level == global_binding_level)
2636 /* Objects declared at top level: */
2637 /* If at least one is a reference, it's ok. */
2638 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2640 /* Reject two definitions. */
2641 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2642 return "redefinition of `%s'";
2643 /* Now we have two tentative defs, or one tentative and one real def. */
2644 /* Insist that the linkage match. */
2645 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2646 return "conflicting declarations of `%s'";
2649 else if (current_binding_level->parm_flag
2650 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2654 /* Newdecl has block scope. If olddecl has block scope also, then
2655 reject two definitions, and reject a definition together with an
2656 external reference. Otherwise, it is OK, because newdecl must
2657 be an extern reference to olddecl. */
2658 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2659 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2660 return "redeclaration of `%s'";
2665 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2666 Create one if none exists so far for the current function.
2667 This function is called for both label definitions and label references. */
2673 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2675 if (current_function_decl == 0)
2677 error ("label %s referenced outside of any function",
2678 IDENTIFIER_POINTER (id));
2682 /* Use a label already defined or ref'd with this name. */
2685 /* But not if it is inherited and wasn't declared to be inheritable. */
2686 if (DECL_CONTEXT (decl) != current_function_decl
2687 && ! C_DECLARED_LABEL_FLAG (decl))
2688 return shadow_label (id);
2692 decl = build_decl (LABEL_DECL, id, void_type_node);
2694 /* Make sure every label has an rtx. */
2697 /* A label not explicitly declared must be local to where it's ref'd. */
2698 DECL_CONTEXT (decl) = current_function_decl;
2700 DECL_MODE (decl) = VOIDmode;
2702 /* Say where one reference is to the label,
2703 for the sake of the error if it is not defined. */
2704 DECL_SOURCE_LINE (decl) = lineno;
2705 DECL_SOURCE_FILE (decl) = input_filename;
2707 IDENTIFIER_LABEL_VALUE (id) = decl;
2709 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2714 /* Make a label named NAME in the current function,
2715 shadowing silently any that may be inherited from containing functions
2716 or containing scopes.
2718 Note that valid use, if the label being shadowed
2719 comes from another scope in the same function,
2720 requires calling declare_nonlocal_label right away. */
2726 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2732 /* Check to make sure that the label hasn't already been declared
2733 at this label scope */
2734 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2735 if (TREE_VALUE (dup) == decl)
2737 error ("duplicate label declaration `%s'",
2738 IDENTIFIER_POINTER (name));
2739 error_with_decl (TREE_VALUE (dup),
2740 "this is a previous declaration");
2741 /* Just use the previous declaration. */
2742 return lookup_label (name);
2745 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2746 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2749 return lookup_label (name);
2752 /* Define a label, specifying the location in the source file.
2753 Return the LABEL_DECL node for the label, if the definition is valid.
2754 Otherwise return 0. */
2757 define_label (filename, line, name)
2762 tree decl = lookup_label (name);
2764 /* If label with this name is known from an outer context, shadow it. */
2765 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2767 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2768 IDENTIFIER_LABEL_VALUE (name) = 0;
2769 decl = lookup_label (name);
2772 if (DECL_INITIAL (decl) != 0)
2774 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2779 /* Mark label as having been defined. */
2780 DECL_INITIAL (decl) = error_mark_node;
2781 /* Say where in the source. */
2782 DECL_SOURCE_FILE (decl) = filename;
2783 DECL_SOURCE_LINE (decl) = line;
2788 /* Return the list of declarations of the current level.
2789 Note that this list is in reverse order unless/until
2790 you nreverse it; and when you do nreverse it, you must
2791 store the result back using `storedecls' or you will lose. */
2796 return current_binding_level->names;
2799 /* Return the list of type-tags (for structs, etc) of the current level. */
2804 return current_binding_level->tags;
2807 /* Store the list of declarations of the current level.
2808 This is done for the parameter declarations of a function being defined,
2809 after they are modified in the light of any missing parameters. */
2815 current_binding_level->names = decls;
2818 /* Similarly, store the list of tags of the current level. */
2824 current_binding_level->tags = tags;
2827 /* Given NAME, an IDENTIFIER_NODE,
2828 return the structure (or union or enum) definition for that name.
2829 Searches binding levels from BINDING_LEVEL up to the global level.
2830 If THISLEVEL_ONLY is nonzero, searches only the specified context
2831 (but skips any tag-transparent contexts to find one that is
2832 meaningful for tags).
2833 CODE says which kind of type the caller wants;
2834 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2835 If the wrong kind of type is found, an error is reported. */
2838 lookup_tag (code, name, binding_level, thislevel_only)
2839 enum tree_code code;
2840 struct binding_level *binding_level;
2844 register struct binding_level *level;
2846 for (level = binding_level; level; level = level->level_chain)
2849 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2851 if (TREE_PURPOSE (tail) == name)
2853 if (TREE_CODE (TREE_VALUE (tail)) != code)
2855 /* Definition isn't the kind we were looking for. */
2856 pending_invalid_xref = name;
2857 pending_invalid_xref_file = input_filename;
2858 pending_invalid_xref_line = lineno;
2860 return TREE_VALUE (tail);
2863 if (thislevel_only && ! level->tag_transparent)
2869 /* Print an error message now
2870 for a recent invalid struct, union or enum cross reference.
2871 We don't print them immediately because they are not invalid
2872 when used in the `struct foo;' construct for shadowing. */
2875 pending_xref_error ()
2877 if (pending_invalid_xref != 0)
2878 error_with_file_and_line (pending_invalid_xref_file,
2879 pending_invalid_xref_line,
2880 "`%s' defined as wrong kind of tag",
2881 IDENTIFIER_POINTER (pending_invalid_xref));
2882 pending_invalid_xref = 0;
2885 /* Given a type, find the tag that was defined for it and return the tag name.
2886 Otherwise return 0. */
2889 lookup_tag_reverse (type)
2892 register struct binding_level *level;
2894 for (level = current_binding_level; level; level = level->level_chain)
2897 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2899 if (TREE_VALUE (tail) == type)
2900 return TREE_PURPOSE (tail);
2906 /* Look up NAME in the current binding level and its superiors
2907 in the namespace of variables, functions and typedefs.
2908 Return a ..._DECL node of some kind representing its definition,
2909 or return 0 if it is undefined. */
2916 if (current_binding_level != global_binding_level
2917 && IDENTIFIER_LOCAL_VALUE (name))
2918 val = IDENTIFIER_LOCAL_VALUE (name);
2920 val = IDENTIFIER_GLOBAL_VALUE (name);
2924 /* Similar to `lookup_name' but look only at current binding level. */
2927 lookup_name_current_level (name)
2932 if (current_binding_level == global_binding_level)
2933 return IDENTIFIER_GLOBAL_VALUE (name);
2935 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2938 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2939 if (DECL_NAME (t) == name)
2945 /* Create the predefined scalar types of C,
2946 and some nodes representing standard constants (0, 1, (void *) 0).
2947 Initialize the global binding level.
2948 Make definitions for built-in primitive functions. */
2951 init_decl_processing ()
2953 register tree endlink;
2954 /* Either char* or void*. */
2955 tree traditional_ptr_type_node;
2956 /* Data types of memcpy and strlen. */
2957 tree memcpy_ftype, memset_ftype, strlen_ftype;
2958 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2959 int wchar_type_size;
2961 tree array_domain_type;
2963 current_function_decl = NULL;
2964 named_labels = NULL;
2965 current_binding_level = NULL_BINDING_LEVEL;
2966 free_binding_level = NULL_BINDING_LEVEL;
2967 pushlevel (0); /* make the binding_level structure for global names */
2968 global_binding_level = current_binding_level;
2970 /* Define `int' and `char' first so that dbx will output them first. */
2972 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2973 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2974 integer_type_node));
2976 /* Define `char', which is like either `signed char' or `unsigned char'
2977 but not the same as either. */
2981 ? make_signed_type (CHAR_TYPE_SIZE)
2982 : make_unsigned_type (CHAR_TYPE_SIZE));
2983 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2986 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2987 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2988 long_integer_type_node));
2990 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2992 unsigned_type_node));
2994 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2995 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2996 long_unsigned_type_node));
2998 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2999 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3000 long_long_integer_type_node));
3002 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
3003 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3004 long_long_unsigned_type_node));
3006 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
3007 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3008 short_integer_type_node));
3010 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
3011 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3012 short_unsigned_type_node));
3014 /* `unsigned long' is the standard type for sizeof.
3015 Traditionally, use a signed type.
3016 Note that stddef.h uses `unsigned long',
3017 and this must agree, even if long and int are the same size. */
3019 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3020 if (flag_traditional && TREE_UNSIGNED (sizetype))
3021 set_sizetype (signed_type (sizetype));
3024 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3026 error_mark_node = make_node (ERROR_MARK);
3027 TREE_TYPE (error_mark_node) = error_mark_node;
3029 /* Define both `signed char' and `unsigned char'. */
3030 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3031 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3032 signed_char_type_node));
3034 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3035 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3036 unsigned_char_type_node));
3038 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3041 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3042 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3044 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3045 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3047 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3050 #if HOST_BITS_PER_WIDE_INT >= 64
3051 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3052 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3055 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3056 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3058 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3059 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3061 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3062 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3064 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3065 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3067 #if HOST_BITS_PER_WIDE_INT >= 64
3068 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3069 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3072 float_type_node = make_node (REAL_TYPE);
3073 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3074 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3076 layout_type (float_type_node);
3078 double_type_node = make_node (REAL_TYPE);
3079 if (flag_short_double)
3080 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3082 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3083 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3085 layout_type (double_type_node);
3087 long_double_type_node = make_node (REAL_TYPE);
3088 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3089 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3090 long_double_type_node));
3091 layout_type (long_double_type_node);
3093 complex_integer_type_node = make_node (COMPLEX_TYPE);
3094 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3095 complex_integer_type_node));
3096 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3097 layout_type (complex_integer_type_node);
3099 complex_float_type_node = make_node (COMPLEX_TYPE);
3100 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3101 complex_float_type_node));
3102 TREE_TYPE (complex_float_type_node) = float_type_node;
3103 layout_type (complex_float_type_node);
3105 complex_double_type_node = make_node (COMPLEX_TYPE);
3106 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3107 complex_double_type_node));
3108 TREE_TYPE (complex_double_type_node) = double_type_node;
3109 layout_type (complex_double_type_node);
3111 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3112 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3113 complex_long_double_type_node));
3114 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3115 layout_type (complex_long_double_type_node);
3118 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3119 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3120 signed_wchar_type_node = signed_type (wchar_type_node);
3121 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3123 integer_zero_node = build_int_2 (0, 0);
3124 TREE_TYPE (integer_zero_node) = integer_type_node;
3125 integer_one_node = build_int_2 (1, 0);
3126 TREE_TYPE (integer_one_node) = integer_type_node;
3128 boolean_type_node = integer_type_node;
3129 boolean_true_node = integer_one_node;
3130 boolean_false_node = integer_zero_node;
3132 size_zero_node = build_int_2 (0, 0);
3133 TREE_TYPE (size_zero_node) = sizetype;
3134 size_one_node = build_int_2 (1, 0);
3135 TREE_TYPE (size_one_node) = sizetype;
3137 void_type_node = make_node (VOID_TYPE);
3138 pushdecl (build_decl (TYPE_DECL,
3139 ridpointers[(int) RID_VOID], void_type_node));
3140 layout_type (void_type_node); /* Uses integer_zero_node */
3141 /* We are not going to have real types in C with less than byte alignment,
3142 so we might as well not have any types that claim to have it. */
3143 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3145 null_pointer_node = build_int_2 (0, 0);
3146 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3147 layout_type (TREE_TYPE (null_pointer_node));
3149 string_type_node = build_pointer_type (char_type_node);
3150 const_string_type_node
3151 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3153 /* Make a type to be the domain of a few array types
3154 whose domains don't really matter.
3155 200 is small enough that it always fits in size_t
3156 and large enough that it can hold most function names for the
3157 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3158 array_domain_type = build_index_type (build_int_2 (200, 0));
3160 /* make a type for arrays of characters.
3161 With luck nothing will ever really depend on the length of this
3163 char_array_type_node
3164 = build_array_type (char_type_node, array_domain_type);
3165 /* Likewise for arrays of ints. */
3167 = build_array_type (integer_type_node, array_domain_type);
3168 /* This is for wide string constants. */
3169 wchar_array_type_node
3170 = build_array_type (wchar_type_node, array_domain_type);
3172 default_function_type
3173 = build_function_type (integer_type_node, NULL_TREE);
3175 ptr_type_node = build_pointer_type (void_type_node);
3177 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3179 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3182 = build_function_type (void_type_node, NULL_TREE);
3185 = build_function_type (float_type_node,
3186 tree_cons (NULL_TREE, float_type_node, endlink));
3189 = build_function_type (double_type_node,
3190 tree_cons (NULL_TREE, double_type_node, endlink));
3192 ldouble_ftype_ldouble
3193 = build_function_type (long_double_type_node,
3194 tree_cons (NULL_TREE, long_double_type_node,
3197 double_ftype_double_double
3198 = build_function_type (double_type_node,
3199 tree_cons (NULL_TREE, double_type_node,
3200 tree_cons (NULL_TREE,
3201 double_type_node, endlink)));
3204 = build_function_type (integer_type_node,
3205 tree_cons (NULL_TREE, integer_type_node, endlink));
3208 = build_function_type (long_integer_type_node,
3209 tree_cons (NULL_TREE,
3210 long_integer_type_node, endlink));
3212 void_ftype_ptr_ptr_int
3213 = build_function_type (void_type_node,
3214 tree_cons (NULL_TREE, ptr_type_node,
3215 tree_cons (NULL_TREE, ptr_type_node,
3216 tree_cons (NULL_TREE,
3220 int_ftype_cptr_cptr_sizet
3221 = build_function_type (integer_type_node,
3222 tree_cons (NULL_TREE, const_ptr_type_node,
3223 tree_cons (NULL_TREE, const_ptr_type_node,
3224 tree_cons (NULL_TREE,
3228 void_ftype_ptr_int_int
3229 = build_function_type (void_type_node,
3230 tree_cons (NULL_TREE, ptr_type_node,
3231 tree_cons (NULL_TREE, integer_type_node,
3232 tree_cons (NULL_TREE,
3236 string_ftype_ptr_ptr /* strcpy prototype */
3237 = build_function_type (string_type_node,
3238 tree_cons (NULL_TREE, string_type_node,
3239 tree_cons (NULL_TREE,
3240 const_string_type_node,
3243 int_ftype_string_string /* strcmp prototype */
3244 = build_function_type (integer_type_node,
3245 tree_cons (NULL_TREE, const_string_type_node,
3246 tree_cons (NULL_TREE,
3247 const_string_type_node,
3250 strlen_ftype /* strlen prototype */
3251 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3252 tree_cons (NULL_TREE, const_string_type_node,
3255 traditional_ptr_type_node
3256 = (flag_traditional ? string_type_node : ptr_type_node);
3258 memcpy_ftype /* memcpy prototype */
3259 = build_function_type (traditional_ptr_type_node,
3260 tree_cons (NULL_TREE, ptr_type_node,
3261 tree_cons (NULL_TREE, const_ptr_type_node,
3262 tree_cons (NULL_TREE,
3266 memset_ftype /* memset prototype */
3267 = build_function_type (traditional_ptr_type_node,
3268 tree_cons (NULL_TREE, ptr_type_node,
3269 tree_cons (NULL_TREE, integer_type_node,
3270 tree_cons (NULL_TREE,
3274 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3276 = build_function_type (ptr_type_node,
3277 tree_cons (NULL_TREE, ptr_type_node, endlink));
3279 builtin_function ("__builtin_constant_p", default_function_type,
3280 BUILT_IN_CONSTANT_P, NULL_PTR);
3282 builtin_function ("__builtin_return_address",
3283 build_function_type (ptr_type_node,
3284 tree_cons (NULL_TREE,
3287 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3289 builtin_function ("__builtin_frame_address",
3290 build_function_type (ptr_type_node,
3291 tree_cons (NULL_TREE,
3294 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3296 builtin_function ("__builtin_aggregate_incoming_address",
3297 build_function_type (ptr_type_node, NULL_TREE),
3298 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3300 /* Hooks for the DWARF 2 __throw routine. */
3301 builtin_function ("__builtin_unwind_init",
3302 build_function_type (void_type_node, endlink),
3303 BUILT_IN_UNWIND_INIT, NULL_PTR);
3304 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3305 BUILT_IN_DWARF_CFA, NULL_PTR);
3306 builtin_function ("__builtin_dwarf_fp_regnum",
3307 build_function_type (unsigned_type_node, endlink),
3308 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3309 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3310 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3311 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3312 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3313 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3314 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3316 ("__builtin_eh_return",
3317 build_function_type (void_type_node,
3318 tree_cons (NULL_TREE, ptr_type_node,
3319 tree_cons (NULL_TREE,
3320 type_for_mode (ptr_mode, 0),
3321 tree_cons (NULL_TREE,
3324 BUILT_IN_EH_RETURN, NULL_PTR);
3326 builtin_function ("__builtin_alloca",
3327 build_function_type (ptr_type_node,
3328 tree_cons (NULL_TREE,
3331 BUILT_IN_ALLOCA, "alloca");
3332 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3333 /* Define alloca, ffs as builtins.
3334 Declare _exit just to mark it as volatile. */
3335 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3337 temp = builtin_function ("alloca",
3338 build_function_type (ptr_type_node,
3339 tree_cons (NULL_TREE,
3342 BUILT_IN_ALLOCA, NULL_PTR);
3343 /* Suppress error if redefined as a non-function. */
3344 DECL_BUILT_IN_NONANSI (temp) = 1;
3345 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3346 /* Suppress error if redefined as a non-function. */
3347 DECL_BUILT_IN_NONANSI (temp) = 1;
3348 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3350 TREE_THIS_VOLATILE (temp) = 1;
3351 TREE_SIDE_EFFECTS (temp) = 1;
3352 /* Suppress error if redefined as a non-function. */
3353 DECL_BUILT_IN_NONANSI (temp) = 1;
3356 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3357 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3359 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3361 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3363 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3365 builtin_function ("__builtin_saveregs",
3366 build_function_type (ptr_type_node, NULL_TREE),
3367 BUILT_IN_SAVEREGS, NULL_PTR);
3368 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3370 builtin_function ("__builtin_varargs",
3371 build_function_type (ptr_type_node,
3372 tree_cons (NULL_TREE,
3375 BUILT_IN_VARARGS, NULL_PTR);
3377 builtin_function ("__builtin_classify_type", default_function_type,
3378 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3379 builtin_function ("__builtin_next_arg",
3380 build_function_type (ptr_type_node, NULL_TREE),
3381 BUILT_IN_NEXT_ARG, NULL_PTR);
3382 builtin_function ("__builtin_args_info",
3383 build_function_type (integer_type_node,
3384 tree_cons (NULL_TREE,
3387 BUILT_IN_ARGS_INFO, NULL_PTR);
3389 /* Untyped call and return. */
3390 builtin_function ("__builtin_apply_args",
3391 build_function_type (ptr_type_node, NULL_TREE),
3392 BUILT_IN_APPLY_ARGS, NULL_PTR);
3394 temp = tree_cons (NULL_TREE,
3395 build_pointer_type (build_function_type (void_type_node,
3397 tree_cons (NULL_TREE,
3399 tree_cons (NULL_TREE,
3402 builtin_function ("__builtin_apply",
3403 build_function_type (ptr_type_node, temp),
3404 BUILT_IN_APPLY, NULL_PTR);
3405 builtin_function ("__builtin_return",
3406 build_function_type (void_type_node,
3407 tree_cons (NULL_TREE,
3410 BUILT_IN_RETURN, NULL_PTR);
3412 /* Currently under experimentation. */
3413 builtin_function ("__builtin_memcpy", memcpy_ftype,
3414 BUILT_IN_MEMCPY, "memcpy");
3415 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3416 BUILT_IN_MEMCMP, "memcmp");
3417 builtin_function ("__builtin_memset", memset_ftype,
3418 BUILT_IN_MEMSET, "memset");
3419 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3420 BUILT_IN_STRCMP, "strcmp");
3421 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3422 BUILT_IN_STRCPY, "strcpy");
3423 builtin_function ("__builtin_strlen", strlen_ftype,
3424 BUILT_IN_STRLEN, "strlen");
3425 builtin_function ("__builtin_sqrtf", float_ftype_float,
3426 BUILT_IN_FSQRT, "sqrtf");
3427 builtin_function ("__builtin_fsqrt", double_ftype_double,
3428 BUILT_IN_FSQRT, "sqrt");
3429 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3430 BUILT_IN_FSQRT, "sqrtl");
3431 builtin_function ("__builtin_sinf", float_ftype_float,
3432 BUILT_IN_SIN, "sinf");
3433 builtin_function ("__builtin_sin", double_ftype_double,
3434 BUILT_IN_SIN, "sin");
3435 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3436 BUILT_IN_SIN, "sinl");
3437 builtin_function ("__builtin_cosf", float_ftype_float,
3438 BUILT_IN_COS, "cosf");
3439 builtin_function ("__builtin_cos", double_ftype_double,
3440 BUILT_IN_COS, "cos");
3441 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3442 BUILT_IN_COS, "cosl");
3443 builtin_function ("__builtin_setjmp",
3444 build_function_type (integer_type_node,
3445 tree_cons (NULL_TREE,
3446 ptr_type_node, endlink)),
3447 BUILT_IN_SETJMP, NULL_PTR);
3448 builtin_function ("__builtin_longjmp",
3451 tree_cons (NULL, ptr_type_node,
3452 tree_cons (NULL_TREE,
3455 BUILT_IN_LONGJMP, NULL_PTR);
3456 builtin_function ("__builtin_trap",
3457 build_function_type (void_type_node, endlink),
3458 BUILT_IN_TRAP, NULL_PTR);
3460 /* In an ANSI C program, it is okay to supply built-in meanings
3461 for these functions, since applications cannot validly use them
3462 with any other meaning.
3463 However, honor the -fno-builtin option. */
3464 if (!flag_no_builtin)
3466 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3467 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3468 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3469 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3471 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3472 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3473 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3475 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3476 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3478 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3480 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3481 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3482 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3483 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3485 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3486 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3487 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3488 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3489 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3490 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3492 /* Declare these functions volatile
3493 to avoid spurious "control drops through" warnings. */
3494 /* Don't specify the argument types, to avoid errors
3495 from certain code which isn't valid in ANSI but which exists. */
3496 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3498 TREE_THIS_VOLATILE (temp) = 1;
3499 TREE_SIDE_EFFECTS (temp) = 1;
3500 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3501 TREE_THIS_VOLATILE (temp) = 1;
3502 TREE_SIDE_EFFECTS (temp) = 1;
3506 /* Support for these has not been written in either expand_builtin
3507 or build_function_call. */
3508 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3509 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3510 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3512 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3514 builtin_function ("__builtin_fmod", double_ftype_double_double,
3515 BUILT_IN_FMOD, NULL_PTR);
3516 builtin_function ("__builtin_frem", double_ftype_double_double,
3517 BUILT_IN_FREM, NULL_PTR);
3518 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3520 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3524 pedantic_lvalues = pedantic;
3526 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3527 declare_function_name ();
3529 start_identifier_warnings ();
3531 /* Prepare to check format strings against argument lists. */
3532 init_function_format_info ();
3536 incomplete_decl_finalize_hook = finish_incomplete_decl;
3538 lang_get_alias_set = c_get_alias_set;
3541 /* Return a definition for a builtin function named NAME and whose data type
3542 is TYPE. TYPE should be a function type with argument types.
3543 FUNCTION_CODE tells later passes how to compile calls to this function.
3544 See tree.h for its possible values.
3546 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3547 the name to be called if we can't opencode the function. */
3550 builtin_function (name, type, function_code, library_name)
3553 enum built_in_function function_code;
3556 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3557 DECL_EXTERNAL (decl) = 1;
3558 TREE_PUBLIC (decl) = 1;
3559 /* If -traditional, permit redefining a builtin function any way you like.
3560 (Though really, if the program redefines these functions,
3561 it probably won't work right unless compiled with -fno-builtin.) */
3562 if (flag_traditional && name[0] != '_')
3563 DECL_BUILT_IN_NONANSI (decl) = 1;
3565 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3566 make_decl_rtl (decl, NULL_PTR, 1);
3568 if (function_code != NOT_BUILT_IN)
3570 DECL_BUILT_IN (decl) = 1;
3571 DECL_FUNCTION_CODE (decl) = function_code;
3573 /* Warn if a function in the namespace for users
3574 is used without an occasion to consider it declared. */
3575 if (name[0] != '_' || name[1] != '_')
3576 C_DECL_ANTICIPATED (decl) = 1;
3581 /* Called when a declaration is seen that contains no names to declare.
3582 If its type is a reference to a structure, union or enum inherited
3583 from a containing scope, shadow that tag name for the current scope
3584 with a forward reference.
3585 If its type defines a new named structure or union
3586 or defines an enum, it is valid but we need not do anything here.
3587 Otherwise, it is an error. */
3590 shadow_tag (declspecs)
3593 shadow_tag_warned (declspecs, 0);
3597 shadow_tag_warned (declspecs, warned)
3600 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3607 pending_invalid_xref = 0;
3609 /* Remove the attributes from declspecs, since they will confuse the
3611 split_specs_attrs (declspecs, &specs, &attrs);
3613 for (link = specs; link; link = TREE_CHAIN (link))
3615 register tree value = TREE_VALUE (link);
3616 register enum tree_code code = TREE_CODE (value);
3618 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3619 /* Used to test also that TYPE_SIZE (value) != 0.
3620 That caused warning for `struct foo;' at top level in the file. */
3622 register tree name = lookup_tag_reverse (value);
3629 if (warned != 1 && code != ENUMERAL_TYPE)
3630 /* Empty unnamed enum OK */
3632 pedwarn ("unnamed struct/union that defines no instances");
3638 t = lookup_tag (code, name, current_binding_level, 1);
3642 t = make_node (code);
3649 if (!warned && ! in_system_header)
3651 warning ("useless keyword or type name in empty declaration");
3658 error ("two types specified in one empty declaration");
3663 pedwarn ("empty declaration");
3667 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3670 groktypename (typename)
3673 if (TREE_CODE (typename) != TREE_LIST)
3675 return grokdeclarator (TREE_VALUE (typename),
3676 TREE_PURPOSE (typename),
3680 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3683 groktypename_in_parm_context (typename)
3686 if (TREE_CODE (typename) != TREE_LIST)
3688 return grokdeclarator (TREE_VALUE (typename),
3689 TREE_PURPOSE (typename),
3693 /* Decode a declarator in an ordinary declaration or data definition.
3694 This is called as soon as the type information and variable name
3695 have been parsed, before parsing the initializer if any.
3696 Here we create the ..._DECL node, fill in its type,
3697 and put it on the list of decls for the current context.
3698 The ..._DECL node is returned as the value.
3700 Exception: for arrays where the length is not specified,
3701 the type is left null, to be filled in by `finish_decl'.
3703 Function definitions do not come here; they go to start_function
3704 instead. However, external and forward declarations of functions
3705 do go through here. Structure field declarations are done by
3706 grokfield and not through here. */
3708 /* Set this to zero to debug not using the temporary obstack
3709 to parse initializers. */
3710 int debug_temp_inits = 1;
3713 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3714 tree declarator, declspecs;
3716 tree attributes, prefix_attributes;
3718 register tree decl = grokdeclarator (declarator, declspecs,
3719 NORMAL, initialized);
3721 int init_written = initialized;
3723 /* The corresponding pop_obstacks is in finish_decl. */
3724 push_obstacks_nochange ();
3726 if (warn_main && TREE_CODE (decl) != FUNCTION_DECL
3727 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3728 warning_with_decl (decl, "`%s' is usually a function");
3731 /* Is it valid for this decl to have an initializer at all?
3732 If not, set INITIALIZED to zero, which will indirectly
3733 tell `finish_decl' to ignore the initializer once it is parsed. */
3734 switch (TREE_CODE (decl))
3737 /* typedef foo = bar means give foo the same type as bar.
3738 We haven't parsed bar yet, so `finish_decl' will fix that up.
3739 Any other case of an initialization in a TYPE_DECL is an error. */
3740 if (pedantic || list_length (declspecs) > 1)
3742 error ("typedef `%s' is initialized",
3743 IDENTIFIER_POINTER (DECL_NAME (decl)));
3749 error ("function `%s' is initialized like a variable",
3750 IDENTIFIER_POINTER (DECL_NAME (decl)));
3755 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3756 error ("parameter `%s' is initialized",
3757 IDENTIFIER_POINTER (DECL_NAME (decl)));
3762 /* Don't allow initializations for incomplete types
3763 except for arrays which might be completed by the initialization. */
3764 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3766 /* A complete type is ok if size is fixed. */
3768 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3769 || C_DECL_VARIABLE_SIZE (decl))
3771 error ("variable-sized object may not be initialized");
3775 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3777 error ("variable `%s' has initializer but incomplete type",
3778 IDENTIFIER_POINTER (DECL_NAME (decl)));
3781 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3783 error ("elements of array `%s' have incomplete type",
3784 IDENTIFIER_POINTER (DECL_NAME (decl)));
3791 #if 0 /* Seems redundant with grokdeclarator. */
3792 if (current_binding_level != global_binding_level
3793 && DECL_EXTERNAL (decl)
3794 && TREE_CODE (decl) != FUNCTION_DECL)
3795 warning ("declaration of `%s' has `extern' and is initialized",
3796 IDENTIFIER_POINTER (DECL_NAME (decl)));
3798 DECL_EXTERNAL (decl) = 0;
3799 if (current_binding_level == global_binding_level)
3800 TREE_STATIC (decl) = 1;
3802 /* Tell `pushdecl' this is an initialized decl
3803 even though we don't yet have the initializer expression.
3804 Also tell `finish_decl' it may store the real initializer. */
3805 DECL_INITIAL (decl) = error_mark_node;
3808 /* If this is a function declaration, write a record describing it to the
3809 prototypes file (if requested). */
3811 if (TREE_CODE (decl) == FUNCTION_DECL)
3812 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3814 /* ANSI specifies that a tentative definition which is not merged with
3815 a non-tentative definition behaves exactly like a definition with an
3816 initializer equal to zero. (Section 3.7.2)
3817 -fno-common gives strict ANSI behavior. Usually you don't want it.
3818 This matters only for variables with external linkage. */
3819 if (! flag_no_common || ! TREE_PUBLIC (decl))
3820 DECL_COMMON (decl) = 1;
3822 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3823 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3826 /* Set attributes here so if duplicate decl, will have proper attributes. */
3827 decl_attributes (decl, attributes, prefix_attributes);
3829 /* Add this decl to the current binding level.
3830 TEM may equal DECL or it may be a previous decl of the same name. */
3831 tem = pushdecl (decl);
3833 /* For a local variable, define the RTL now. */
3834 if (current_binding_level != global_binding_level
3835 /* But not if this is a duplicate decl
3836 and we preserved the rtl from the previous one
3837 (which may or may not happen). */
3838 && DECL_RTL (tem) == 0)
3840 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3842 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3843 && DECL_INITIAL (tem) != 0)
3849 /* When parsing and digesting the initializer,
3850 use temporary storage. Do this even if we will ignore the value. */
3851 if (current_binding_level == global_binding_level && debug_temp_inits)
3852 temporary_allocation ();
3858 /* Finish processing of a declaration;
3859 install its initial value.
3860 If the length of an array type is not known before,
3861 it must be determined now, from the initial value, or it is an error. */
3864 finish_decl (decl, init, asmspec_tree)
3868 register tree type = TREE_TYPE (decl);
3869 int was_incomplete = (DECL_SIZE (decl) == 0);
3870 int temporary = allocation_temporary_p ();
3873 /* If a name was specified, get the string. */
3875 asmspec = TREE_STRING_POINTER (asmspec_tree);
3877 /* If `start_decl' didn't like having an initialization, ignore it now. */
3879 if (init != 0 && DECL_INITIAL (decl) == 0)
3881 /* Don't crash if parm is initialized. */
3882 if (TREE_CODE (decl) == PARM_DECL)
3885 if (ITERATOR_P (decl))
3888 error_with_decl (decl, "iterator has no initial value");
3890 init = save_expr (init);
3895 if (TREE_CODE (decl) != TYPE_DECL)
3896 store_init_value (decl, init);
3899 /* typedef foo = bar; store the type of bar as the type of foo. */
3900 TREE_TYPE (decl) = TREE_TYPE (init);
3901 DECL_INITIAL (decl) = init = 0;
3905 /* Pop back to the obstack that is current for this binding level.
3906 This is because MAXINDEX, rtl, etc. to be made below
3907 must go in the permanent obstack. But don't discard the
3908 temporary data yet. */
3910 #if 0 /* pop_obstacks was near the end; this is what was here. */
3911 if (current_binding_level == global_binding_level && temporary)
3912 end_temporary_allocation ();
3915 /* Deduce size of array from initialization, if not already known */
3917 if (TREE_CODE (type) == ARRAY_TYPE
3918 && TYPE_DOMAIN (type) == 0
3919 && TREE_CODE (decl) != TYPE_DECL)
3922 = (TREE_STATIC (decl)
3923 /* Even if pedantic, an external linkage array
3924 may have incomplete type at first. */
3925 ? pedantic && !TREE_PUBLIC (decl)
3926 : !DECL_EXTERNAL (decl));
3928 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3930 /* Get the completed type made by complete_array_type. */
3931 type = TREE_TYPE (decl);
3934 error_with_decl (decl, "initializer fails to determine size of `%s'");
3939 error_with_decl (decl, "array size missing in `%s'");
3940 /* If a `static' var's size isn't known,
3941 make it extern as well as static, so it does not get
3943 If it is not `static', then do not mark extern;
3944 finish_incomplete_decl will give it a default size
3945 and it will get allocated. */
3946 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3947 DECL_EXTERNAL (decl) = 1;
3950 /* TYPE_MAX_VALUE is always one less than the number of elements
3951 in the array, because we start counting at zero. Therefore,
3952 warn only if the value is less than zero. */
3953 if (pedantic && TYPE_DOMAIN (type) != 0
3954 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3955 error_with_decl (decl, "zero or negative size array `%s'");
3957 layout_decl (decl, 0);
3960 if (TREE_CODE (decl) == VAR_DECL)
3962 if (DECL_SIZE (decl) == 0
3963 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3964 layout_decl (decl, 0);
3966 if (DECL_SIZE (decl) == 0
3967 && (TREE_STATIC (decl)
3969 /* A static variable with an incomplete type
3970 is an error if it is initialized.
3971 Also if it is not file scope.
3972 Otherwise, let it through, but if it is not `extern'
3973 then it may cause an error message later. */
3974 /* A duplicate_decls call could have changed an extern
3975 declaration into a file scope one. This can be detected
3976 by TREE_ASM_WRITTEN being set. */
3977 (DECL_INITIAL (decl) != 0
3978 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3980 /* An automatic variable with an incomplete type
3982 !DECL_EXTERNAL (decl)))
3984 error_with_decl (decl, "storage size of `%s' isn't known");
3985 TREE_TYPE (decl) = error_mark_node;
3988 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3989 && DECL_SIZE (decl) != 0)
3991 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3992 constant_expression_warning (DECL_SIZE (decl));
3994 error_with_decl (decl, "storage size of `%s' isn't constant");
3997 if (TREE_USED (type))
3998 TREE_USED (decl) = 1;
4001 /* If this is a function and an assembler name is specified, it isn't
4002 builtin any more. Also reset DECL_RTL so we can give it its new
4004 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4006 DECL_BUILT_IN (decl) = 0;
4007 DECL_RTL (decl) = 0;
4010 /* Output the assembler code and/or RTL code for variables and functions,
4011 unless the type is an undefined structure or union.
4012 If not, it will get done when the type is completed. */
4014 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4016 if ((flag_traditional || TREE_PERMANENT (decl))
4017 && allocation_temporary_p ())
4019 push_obstacks_nochange ();
4020 end_temporary_allocation ();
4021 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4022 maybe_objc_check_decl (decl);
4023 rest_of_decl_compilation (decl, asmspec,
4024 (DECL_CONTEXT (decl) == 0
4025 || TREE_ASM_WRITTEN (decl)),
4031 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4032 maybe_objc_check_decl (decl);
4033 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4036 if (DECL_CONTEXT (decl) != 0)
4038 /* Recompute the RTL of a local array now
4039 if it used to be an incomplete type. */
4041 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4043 /* If we used it already as memory, it must stay in memory. */
4044 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4045 /* If it's still incomplete now, no init will save it. */
4046 if (DECL_SIZE (decl) == 0)
4047 DECL_INITIAL (decl) = 0;
4050 /* Compute and store the initial value. */
4051 if (TREE_CODE (decl) != FUNCTION_DECL)
4052 expand_decl_init (decl);
4056 if (TREE_CODE (decl) == TYPE_DECL)
4058 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4059 maybe_objc_check_decl (decl);
4060 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4064 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4065 /* This test used to include TREE_PERMANENT, however, we have the same
4066 problem with initializers at the function level. Such initializers get
4067 saved until the end of the function on the momentary_obstack. */
4068 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4070 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4071 space with DECL_ARG_TYPE. */
4072 && TREE_CODE (decl) != PARM_DECL)
4074 /* We need to remember that this array HAD an initialization,
4075 but discard the actual temporary nodes,
4076 since we can't have a permanent node keep pointing to them. */
4077 /* We make an exception for inline functions, since it's
4078 normal for a local extern redeclaration of an inline function
4079 to have a copy of the top-level decl's DECL_INLINE. */
4080 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4082 /* If this is a const variable, then preserve the
4083 initializer instead of discarding it so that we can optimize
4084 references to it. */
4085 /* This test used to include TREE_STATIC, but this won't be set
4086 for function level initializers. */
4087 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4089 preserve_initializer ();
4090 /* Hack? Set the permanent bit for something that is permanent,
4091 but not on the permanent obstack, so as to convince
4092 output_constant_def to make its rtl on the permanent
4094 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4096 /* The initializer and DECL must have the same (or equivalent
4097 types), but if the initializer is a STRING_CST, its type
4098 might not be on the right obstack, so copy the type
4100 TREE_TYPE (DECL_INITIAL (decl)) = type;
4103 DECL_INITIAL (decl) = error_mark_node;
4107 /* If requested, warn about definitions of large data objects. */
4109 if (warn_larger_than
4110 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4111 && !DECL_EXTERNAL (decl))
4113 register tree decl_size = DECL_SIZE (decl);
4115 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4117 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4119 if (units > larger_than_size)
4120 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4125 /* Resume permanent allocation, if not within a function. */
4126 /* The corresponding push_obstacks_nochange is in start_decl,
4127 and in push_parm_decl and in grokfield. */
4131 /* If we have gone back from temporary to permanent allocation,
4132 actually free the temporary space that we no longer need. */
4133 if (temporary && !allocation_temporary_p ())
4134 permanent_allocation (0);
4136 /* At the end of a declaration, throw away any variable type sizes
4137 of types defined inside that declaration. There is no use
4138 computing them in the following function definition. */
4139 if (current_binding_level == global_binding_level)
4140 get_pending_sizes ();
4143 /* If DECL has a cleanup, build and return that cleanup here.
4144 This is a callback called by expand_expr. */
4147 maybe_build_cleanup (decl)
4148 tree decl ATTRIBUTE_UNUSED;
4150 /* There are no cleanups in C. */
4154 /* Given a parsed parameter declaration,
4155 decode it into a PARM_DECL and push that on the current binding level.
4156 Also, for the sake of forward parm decls,
4157 record the given order of parms in `parm_order'. */
4160 push_parm_decl (parm)
4164 int old_immediate_size_expand = immediate_size_expand;
4165 /* Don't try computing parm sizes now -- wait till fn is called. */
4166 immediate_size_expand = 0;
4168 /* The corresponding pop_obstacks is in finish_decl. */
4169 push_obstacks_nochange ();
4171 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4172 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4173 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4174 TREE_PURPOSE (TREE_VALUE (parm)));
4177 if (DECL_NAME (decl))
4180 olddecl = lookup_name (DECL_NAME (decl));
4181 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4182 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4186 decl = pushdecl (decl);
4188 immediate_size_expand = old_immediate_size_expand;
4190 current_binding_level->parm_order
4191 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4193 /* Add this decl to the current binding level. */
4194 finish_decl (decl, NULL_TREE, NULL_TREE);
4197 /* Clear the given order of parms in `parm_order'.
4198 Used at start of parm list,
4199 and also at semicolon terminating forward decls. */
4204 current_binding_level->parm_order = NULL_TREE;
4207 /* Make TYPE a complete type based on INITIAL_VALUE.
4208 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4209 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4212 complete_array_type (type, initial_value, do_default)
4217 register tree maxindex = NULL_TREE;
4222 /* Note MAXINDEX is really the maximum index,
4223 one less than the size. */
4224 if (TREE_CODE (initial_value) == STRING_CST)
4227 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4228 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4231 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4233 tree elts = CONSTRUCTOR_ELTS (initial_value);
4234 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4235 for (; elts; elts = TREE_CHAIN (elts))
4237 if (TREE_PURPOSE (elts))
4238 maxindex = TREE_PURPOSE (elts);
4240 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4242 maxindex = copy_node (maxindex);
4246 /* Make an error message unless that happened already. */
4247 if (initial_value != error_mark_node)
4250 /* Prevent further error messages. */
4251 maxindex = build_int_2 (0, 0);
4258 maxindex = build_int_2 (0, 0);
4264 TYPE_DOMAIN (type) = build_index_type (maxindex);
4265 if (!TREE_TYPE (maxindex))
4266 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4269 /* Lay out the type now that we can get the real answer. */
4276 /* Given declspecs and a declarator,
4277 determine the name and type of the object declared
4278 and construct a ..._DECL node for it.
4279 (In one case we can return a ..._TYPE node instead.
4280 For invalid input we sometimes return 0.)
4282 DECLSPECS is a chain of tree_list nodes whose value fields
4283 are the storage classes and type specifiers.
4285 DECL_CONTEXT says which syntactic context this declaration is in:
4286 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4287 FUNCDEF for a function definition. Like NORMAL but a few different
4288 error messages in each case. Return value may be zero meaning
4289 this definition is too screwy to try to parse.
4290 PARM for a parameter declaration (either within a function prototype
4291 or before a function body). Make a PARM_DECL, or return void_type_node.
4292 TYPENAME if for a typename (in a cast or sizeof).
4293 Don't make a DECL node; just return the ..._TYPE node.
4294 FIELD for a struct or union field; make a FIELD_DECL.
4295 BITFIELD for a field with specified width.
4296 INITIALIZED is 1 if the decl has an initializer.
4298 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4299 It may also be so in the PARM case, for a prototype where the
4300 argument type is specified but not the name.
4302 This function is where the complicated C meanings of `static'
4303 and `extern' are interpreted. */
4306 grokdeclarator (declarator, declspecs, decl_context, initialized)
4309 enum decl_context decl_context;
4314 tree type = NULL_TREE;
4319 int explicit_int = 0;
4320 int explicit_char = 0;
4321 int defaulted_int = 0;
4322 tree typedef_decl = 0;
4324 tree typedef_type = 0;
4325 int funcdef_flag = 0;
4326 enum tree_code innermost_code = ERROR_MARK;
4328 int size_varies = 0;
4329 tree decl_machine_attr = NULL_TREE;
4331 if (decl_context == BITFIELD)
4332 bitfield = 1, decl_context = FIELD;
4334 if (decl_context == FUNCDEF)
4335 funcdef_flag = 1, decl_context = NORMAL;
4337 push_obstacks_nochange ();
4339 if (flag_traditional && allocation_temporary_p ())
4340 end_temporary_allocation ();
4342 /* Look inside a declarator for the name being declared
4343 and get it as a string, for an error message. */
4345 register tree decl = declarator;
4349 switch (TREE_CODE (decl))
4354 innermost_code = TREE_CODE (decl);
4355 decl = TREE_OPERAND (decl, 0);
4358 case IDENTIFIER_NODE:
4359 name = IDENTIFIER_POINTER (decl);
4370 /* A function definition's declarator must have the form of
4371 a function declarator. */
4373 if (funcdef_flag && innermost_code != CALL_EXPR)
4376 /* Anything declared one level down from the top level
4377 must be one of the parameters of a function
4378 (because the body is at least two levels down). */
4380 /* If this looks like a function definition, make it one,
4381 even if it occurs where parms are expected.
4382 Then store_parm_decls will reject it and not use it as a parm. */
4383 if (decl_context == NORMAL && !funcdef_flag
4384 && current_binding_level->parm_flag)
4385 decl_context = PARM;
4387 /* Look through the decl specs and record which ones appear.
4388 Some typespecs are defined as built-in typenames.
4389 Others, the ones that are modifiers of other types,
4390 are represented by bits in SPECBITS: set the bits for
4391 the modifiers that appear. Storage class keywords are also in SPECBITS.
4393 If there is a typedef name or a type, store the type in TYPE.
4394 This includes builtin typedefs such as `int'.
4396 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4397 and did not come from a user typedef.
4399 Set LONGLONG if `long' is mentioned twice. */
4401 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4404 register tree id = TREE_VALUE (spec);
4406 if (id == ridpointers[(int) RID_INT])
4408 if (id == ridpointers[(int) RID_CHAR])
4411 if (TREE_CODE (id) == IDENTIFIER_NODE)
4412 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4414 if (ridpointers[i] == id)
4416 if (i == (int) RID_LONG && specbits & (1<<i))
4419 error ("`long long long' is too long for GCC");
4422 if (pedantic && ! in_system_header && warn_long_long)
4423 pedwarn ("ANSI C does not support `long long'");
4427 else if (specbits & (1 << i))
4428 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4434 error ("two or more data types in declaration of `%s'", name);
4435 /* Actual typedefs come to us as TYPE_DECL nodes. */
4436 else if (TREE_CODE (id) == TYPE_DECL)
4438 type = TREE_TYPE (id);
4439 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4442 /* Built-in types come as identifiers. */
4443 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4445 register tree t = lookup_name (id);
4446 if (TREE_TYPE (t) == error_mark_node)
4448 else if (!t || TREE_CODE (t) != TYPE_DECL)
4449 error ("`%s' fails to be a typedef or built in type",
4450 IDENTIFIER_POINTER (id));
4453 type = TREE_TYPE (t);
4457 else if (TREE_CODE (id) != ERROR_MARK)
4463 typedef_type = type;
4465 size_varies = C_TYPE_VARIABLE_SIZE (type);
4467 /* No type at all: default to `int', and set DEFAULTED_INT
4468 because it was not a user-defined typedef. */
4472 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4473 | (1 << (int) RID_SIGNED)
4474 | (1 << (int) RID_UNSIGNED))))
4475 /* Don't warn about typedef foo = bar. */
4476 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4477 && ! (in_system_header && ! allocation_temporary_p ()))
4479 /* C9x will probably require a diagnostic here.
4480 For now, issue a warning if -Wreturn-type and this is a function,
4481 or if -Wimplicit; prefer the former warning since it is more
4483 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4484 warn_about_return_type = 1;
4485 else if (warn_implicit_int)
4486 warning ("type defaults to `int' in declaration of `%s'", name);
4490 type = integer_type_node;
4493 /* Now process the modifiers that were specified
4494 and check for invalid combinations. */
4496 /* Long double is a special combination. */
4498 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4499 && TYPE_MAIN_VARIANT (type) == double_type_node)
4501 specbits &= ~ (1 << (int) RID_LONG);
4502 type = long_double_type_node;
4505 /* Check all other uses of type modifiers. */
4507 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4508 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4512 if ((specbits & 1 << (int) RID_LONG)
4513 && (specbits & 1 << (int) RID_SHORT))
4514 error ("both long and short specified for `%s'", name);
4515 else if (((specbits & 1 << (int) RID_LONG)
4516 || (specbits & 1 << (int) RID_SHORT))
4518 error ("long or short specified with char for `%s'", name);
4519 else if (((specbits & 1 << (int) RID_LONG)
4520 || (specbits & 1 << (int) RID_SHORT))
4521 && TREE_CODE (type) == REAL_TYPE)
4523 static int already = 0;
4525 error ("long or short specified with floating type for `%s'", name);
4526 if (! already && ! pedantic)
4528 error ("the only valid combination is `long double'");
4532 else if ((specbits & 1 << (int) RID_SIGNED)
4533 && (specbits & 1 << (int) RID_UNSIGNED))
4534 error ("both signed and unsigned specified for `%s'", name);
4535 else if (TREE_CODE (type) != INTEGER_TYPE)
4536 error ("long, short, signed or unsigned invalid for `%s'", name);
4540 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4542 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4544 if (flag_pedantic_errors)
4549 /* Discard the type modifiers if they are invalid. */
4552 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4553 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4558 if ((specbits & (1 << (int) RID_COMPLEX))
4559 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4561 error ("complex invalid for `%s'", name);
4562 specbits &= ~ (1 << (int) RID_COMPLEX);
4565 /* Decide whether an integer type is signed or not.
4566 Optionally treat bitfields as signed by default. */
4567 if (specbits & 1 << (int) RID_UNSIGNED
4568 /* Traditionally, all bitfields are unsigned. */
4569 || (bitfield && flag_traditional
4570 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4571 || (bitfield && ! flag_signed_bitfields
4572 && (explicit_int || defaulted_int || explicit_char
4573 /* A typedef for plain `int' without `signed'
4574 can be controlled just like plain `int'. */
4575 || ! (typedef_decl != 0
4576 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4577 && TREE_CODE (type) != ENUMERAL_TYPE
4578 && !(specbits & 1 << (int) RID_SIGNED)))
4581 type = long_long_unsigned_type_node;
4582 else if (specbits & 1 << (int) RID_LONG)
4583 type = long_unsigned_type_node;
4584 else if (specbits & 1 << (int) RID_SHORT)
4585 type = short_unsigned_type_node;
4586 else if (type == char_type_node)
4587 type = unsigned_char_type_node;
4588 else if (typedef_decl)
4589 type = unsigned_type (type);
4591 type = unsigned_type_node;
4593 else if ((specbits & 1 << (int) RID_SIGNED)
4594 && type == char_type_node)
4595 type = signed_char_type_node;
4597 type = long_long_integer_type_node;
4598 else if (specbits & 1 << (int) RID_LONG)
4599 type = long_integer_type_node;
4600 else if (specbits & 1 << (int) RID_SHORT)
4601 type = short_integer_type_node;
4603 if (specbits & 1 << (int) RID_COMPLEX)
4605 /* If we just have "complex", it is equivalent to
4606 "complex double", but if any modifiers at all are specified it is
4607 the complex form of TYPE. E.g, "complex short" is
4608 "complex short int". */
4610 if (defaulted_int && ! longlong
4611 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4612 | (1 << (int) RID_SIGNED)
4613 | (1 << (int) RID_UNSIGNED))))
4614 type = complex_double_type_node;
4615 else if (type == integer_type_node)
4616 type = complex_integer_type_node;
4617 else if (type == float_type_node)
4618 type = complex_float_type_node;
4619 else if (type == double_type_node)
4620 type = complex_double_type_node;
4621 else if (type == long_double_type_node)
4622 type = complex_long_double_type_node;
4624 type = build_complex_type (type);
4627 /* Set CONSTP if this declaration is `const', whether by
4628 explicit specification or via a typedef.
4629 Likewise for VOLATILEP. */
4631 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4632 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4633 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4635 pedwarn ("duplicate `const'");
4637 pedwarn ("duplicate `volatile'");
4638 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4639 type = TYPE_MAIN_VARIANT (type);
4641 /* Warn if two storage classes are given. Default to `auto'. */
4646 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4647 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4648 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4649 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4650 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4651 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4653 /* Warn about storage classes that are invalid for certain
4654 kinds of declarations (parameters, typenames, etc.). */
4657 error ("multiple storage classes in declaration of `%s'", name);
4658 else if (funcdef_flag
4660 & ((1 << (int) RID_REGISTER)
4661 | (1 << (int) RID_AUTO)
4662 | (1 << (int) RID_TYPEDEF))))
4664 if (specbits & 1 << (int) RID_AUTO
4665 && (pedantic || current_binding_level == global_binding_level))
4666 pedwarn ("function definition declared `auto'");
4667 if (specbits & 1 << (int) RID_REGISTER)
4668 error ("function definition declared `register'");
4669 if (specbits & 1 << (int) RID_TYPEDEF)
4670 error ("function definition declared `typedef'");
4671 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4672 | (1 << (int) RID_AUTO));
4674 else if (decl_context != NORMAL && nclasses > 0)
4676 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4680 error ((decl_context == FIELD
4681 ? "storage class specified for structure field `%s'"
4682 : (decl_context == PARM
4683 ? "storage class specified for parameter `%s'"
4684 : "storage class specified for typename")),
4686 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4687 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4688 | (1 << (int) RID_EXTERN));
4691 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4693 /* `extern' with initialization is invalid if not at top level. */
4694 if (current_binding_level == global_binding_level)
4695 warning ("`%s' initialized and declared `extern'", name);
4697 error ("`%s' has both `extern' and initializer", name);
4699 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4700 && current_binding_level != global_binding_level)
4701 error ("nested function `%s' declared `extern'", name);
4702 else if (current_binding_level == global_binding_level
4703 && specbits & (1 << (int) RID_AUTO))
4704 error ("top-level declaration of `%s' specifies `auto'", name);
4705 else if ((specbits & 1 << (int) RID_ITERATOR)
4706 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4708 error ("iterator `%s' has derived type", name);
4709 type = error_mark_node;
4711 else if ((specbits & 1 << (int) RID_ITERATOR)
4712 && TREE_CODE (type) != INTEGER_TYPE)
4714 error ("iterator `%s' has noninteger type", name);
4715 type = error_mark_node;
4719 /* Now figure out the structure of the declarator proper.
4720 Descend through it, creating more complex types, until we reach
4721 the declared identifier (or NULL_TREE, in an absolute declarator). */
4723 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4725 if (type == error_mark_node)
4727 declarator = TREE_OPERAND (declarator, 0);
4731 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4732 an INDIRECT_REF (for *...),
4733 a CALL_EXPR (for ...(...)),
4734 an identifier (for the name being declared)
4735 or a null pointer (for the place in an absolute declarator
4736 where the name was omitted).
4737 For the last two cases, we have just exited the loop.
4739 At this point, TYPE is the type of elements of an array,
4740 or for a function to return, or for a pointer to point to.
4741 After this sequence of ifs, TYPE is the type of the
4742 array or function or pointer, and DECLARATOR has had its
4743 outermost layer removed. */
4745 if (TREE_CODE (declarator) == ARRAY_REF)
4747 register tree itype = NULL_TREE;
4748 register tree size = TREE_OPERAND (declarator, 1);
4749 /* An uninitialized decl with `extern' is a reference. */
4750 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4751 /* The index is a signed object `sizetype' bits wide. */
4752 tree index_type = signed_type (sizetype);
4754 declarator = TREE_OPERAND (declarator, 0);
4756 /* Check for some types that there cannot be arrays of. */
4758 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4760 error ("declaration of `%s' as array of voids", name);
4761 type = error_mark_node;
4764 if (TREE_CODE (type) == FUNCTION_TYPE)
4766 error ("declaration of `%s' as array of functions", name);
4767 type = error_mark_node;
4770 if (size == error_mark_node)
4771 type = error_mark_node;
4773 if (type == error_mark_node)
4776 /* If this is a block level extern, it must live past the end
4777 of the function so that we can check it against other extern
4778 declarations (IDENTIFIER_LIMBO_VALUE). */
4779 if (extern_ref && allocation_temporary_p ())
4780 end_temporary_allocation ();
4782 /* If size was specified, set ITYPE to a range-type for that size.
4783 Otherwise, ITYPE remains null. finish_decl may figure it out
4784 from an initial value. */
4788 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4789 STRIP_TYPE_NOPS (size);
4791 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4792 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4794 error ("size of array `%s' has non-integer type", name);
4795 size = integer_one_node;
4798 if (pedantic && integer_zerop (size))
4799 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4801 if (TREE_CODE (size) == INTEGER_CST)
4803 constant_expression_warning (size);
4804 if (tree_int_cst_sgn (size) < 0)
4806 error ("size of array `%s' is negative", name);
4807 size = integer_one_node;
4812 /* Make sure the array size remains visibly nonconstant
4813 even if it is (eg) a const variable with known value. */
4818 if (TREE_CONSTANT (size))
4819 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4821 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4825 /* Convert size to index_type, so that if it is a variable
4826 the computations will be done in the proper mode. */
4827 itype = fold (build (MINUS_EXPR, index_type,
4828 convert (index_type, size),
4829 convert (index_type, size_one_node)));
4831 /* If that overflowed, the array is too big.
4832 ??? While a size of INT_MAX+1 technically shouldn't cause
4833 an overflow (because we subtract 1), the overflow is recorded
4834 during the conversion to index_type, before the subtraction.
4835 Handling this case seems like an unnecessary complication. */
4836 if (TREE_OVERFLOW (itype))
4838 error ("size of array `%s' is too large", name);
4839 type = error_mark_node;
4844 itype = variable_size (itype);
4845 itype = build_index_type (itype);
4848 #if 0 /* This had bad results for pointers to arrays, as in
4849 union incomplete (*foo)[4]; */
4850 /* Complain about arrays of incomplete types, except in typedefs. */
4852 if (TYPE_SIZE (type) == 0
4853 /* Avoid multiple warnings for nested array types. */
4854 && TREE_CODE (type) != ARRAY_TYPE
4855 && !(specbits & (1 << (int) RID_TYPEDEF))
4856 && !C_TYPE_BEING_DEFINED (type))
4857 warning ("array type has incomplete element type");
4860 #if 0 /* We shouldn't have a function type here at all!
4861 Functions aren't allowed as array elements. */
4862 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4863 && (constp || volatilep))
4864 pedwarn ("ANSI C forbids const or volatile function types");
4867 /* Build the array type itself, then merge any constancy or
4868 volatility into the target type. We must do it in this order
4869 to ensure that the TYPE_MAIN_VARIANT field of the array type
4870 is set correctly. */
4872 type = build_array_type (type, itype);
4873 if (constp || volatilep)
4874 type = c_build_type_variant (type, constp, volatilep);
4876 #if 0 /* don't clear these; leave them set so that the array type
4877 or the variable is itself const or volatile. */
4883 C_TYPE_VARIABLE_SIZE (type) = 1;
4885 else if (TREE_CODE (declarator) == CALL_EXPR)
4887 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4888 || current_binding_level == global_binding_level);
4891 /* Declaring a function type.
4892 Make sure we have a valid type for the function to return. */
4893 if (type == error_mark_node)
4898 /* Warn about some types functions can't return. */
4900 if (TREE_CODE (type) == FUNCTION_TYPE)
4902 error ("`%s' declared as function returning a function", name);
4903 type = integer_type_node;
4905 if (TREE_CODE (type) == ARRAY_TYPE)
4907 error ("`%s' declared as function returning an array", name);
4908 type = integer_type_node;
4911 #ifndef TRADITIONAL_RETURN_FLOAT
4912 /* Traditionally, declaring return type float means double. */
4914 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4915 type = double_type_node;
4916 #endif /* TRADITIONAL_RETURN_FLOAT */
4918 /* If this is a block level extern, it must live past the end
4919 of the function so that we can check it against other extern
4920 declarations (IDENTIFIER_LIMBO_VALUE). */
4921 if (extern_ref && allocation_temporary_p ())
4922 end_temporary_allocation ();
4924 /* Construct the function type and go to the next
4925 inner layer of declarator. */
4927 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4929 /* Say it's a definition
4930 only for the CALL_EXPR
4931 closest to the identifier. */
4932 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4933 #if 0 /* This seems to be false. We turn off temporary allocation
4934 above in this function if -traditional.
4935 And this code caused inconsistent results with prototypes:
4936 callers would ignore them, and pass arguments wrong. */
4938 /* Omit the arg types if -traditional, since the arg types
4939 and the list links might not be permanent. */
4940 type = build_function_type (type,
4942 ? NULL_TREE : arg_types);
4944 /* ANSI seems to say that `const int foo ();'
4945 does not make the function foo const. */
4946 if (constp || volatilep)
4947 type = c_build_type_variant (type, constp, volatilep);
4951 type = build_function_type (type, arg_types);
4952 declarator = TREE_OPERAND (declarator, 0);
4954 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4955 the formal parameter list of this FUNCTION_TYPE to point to
4956 the FUNCTION_TYPE node itself. */
4961 for (link = last_function_parm_tags;
4963 link = TREE_CHAIN (link))
4964 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4967 else if (TREE_CODE (declarator) == INDIRECT_REF)
4969 /* Merge any constancy or volatility into the target type
4972 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4973 && (constp || volatilep))
4974 pedwarn ("ANSI C forbids const or volatile function types");
4975 if (constp || volatilep)
4976 type = c_build_type_variant (type, constp, volatilep);
4981 type = build_pointer_type (type);
4983 /* Process a list of type modifier keywords
4984 (such as const or volatile) that were given inside the `*'. */
4986 if (TREE_TYPE (declarator))
4988 register tree typemodlist;
4990 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4991 typemodlist = TREE_CHAIN (typemodlist))
4993 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4995 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
5000 error ("invalid type modifier within pointer declarator");
5004 pedwarn ("duplicate `const'");
5006 pedwarn ("duplicate `volatile'");
5009 declarator = TREE_OPERAND (declarator, 0);
5016 /* Now TYPE has the actual type. */
5018 /* Did array size calculations overflow? */
5020 if (TREE_CODE (type) == ARRAY_TYPE
5022 && TREE_OVERFLOW (TYPE_SIZE (type)))
5023 error ("size of array `%s' is too large", name);
5025 /* If this is declaring a typedef name, return a TYPE_DECL. */
5027 if (specbits & (1 << (int) RID_TYPEDEF))
5030 /* Note that the grammar rejects storage classes
5031 in typenames, fields or parameters */
5032 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5033 && (constp || volatilep))
5034 pedwarn ("ANSI C forbids const or volatile function types");
5035 if (constp || volatilep)
5036 type = c_build_type_variant (type, constp, volatilep);
5037 decl = build_decl (TYPE_DECL, declarator, type);
5038 if ((specbits & (1 << (int) RID_SIGNED))
5039 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5040 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5045 /* Detect the case of an array type of unspecified size
5046 which came, as such, direct from a typedef name.
5047 We must copy the type, so that each identifier gets
5048 a distinct type, so that each identifier's size can be
5049 controlled separately by its own initializer. */
5051 if (type != 0 && typedef_type != 0
5052 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5053 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5055 type = build_array_type (TREE_TYPE (type), 0);
5057 C_TYPE_VARIABLE_SIZE (type) = 1;
5060 /* If this is a type name (such as, in a cast or sizeof),
5061 compute the type and return it now. */
5063 if (decl_context == TYPENAME)
5065 /* Note that the grammar rejects storage classes
5066 in typenames, fields or parameters */
5067 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5068 && (constp || volatilep))
5069 pedwarn ("ANSI C forbids const or volatile function types");
5070 if (constp || volatilep)
5071 type = c_build_type_variant (type, constp, volatilep);
5076 /* Aside from typedefs and type names (handle above),
5077 `void' at top level (not within pointer)
5078 is allowed only in public variables.
5079 We don't complain about parms either, but that is because
5080 a better error message can be made later. */
5082 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5083 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5084 && ((specbits & (1 << (int) RID_EXTERN))
5085 || (current_binding_level == global_binding_level
5087 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5089 error ("variable or field `%s' declared void", name);
5090 type = integer_type_node;
5093 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5094 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5099 if (decl_context == PARM)
5101 tree type_as_written = type;
5104 /* A parameter declared as an array of T is really a pointer to T.
5105 One declared as a function is really a pointer to a function. */
5107 if (TREE_CODE (type) == ARRAY_TYPE)
5109 /* Transfer const-ness of array into that of type pointed to. */
5110 type = TREE_TYPE (type);
5111 if (constp || volatilep)
5112 type = c_build_type_variant (type, constp, volatilep);
5113 type = build_pointer_type (type);
5114 volatilep = constp = 0;
5117 else if (TREE_CODE (type) == FUNCTION_TYPE)
5119 if (pedantic && (constp || volatilep))
5120 pedwarn ("ANSI C forbids const or volatile function types");
5121 if (constp || volatilep)
5122 type = c_build_type_variant (type, constp, volatilep);
5123 type = build_pointer_type (type);
5124 volatilep = constp = 0;
5127 decl = build_decl (PARM_DECL, declarator, type);
5129 C_DECL_VARIABLE_SIZE (decl) = 1;
5131 /* Compute the type actually passed in the parmlist,
5132 for the case where there is no prototype.
5133 (For example, shorts and chars are passed as ints.)
5134 When there is a prototype, this is overridden later. */
5136 DECL_ARG_TYPE (decl) = type;
5137 main_type = (type == error_mark_node
5139 : TYPE_MAIN_VARIANT (type));
5140 if (main_type == float_type_node)
5141 DECL_ARG_TYPE (decl) = double_type_node;
5142 /* Don't use TYPE_PRECISION to decide whether to promote,
5143 because we should convert short if it's the same size as int,
5144 but we should not convert long if it's the same size as int. */
5145 else if (TREE_CODE (main_type) != ERROR_MARK
5146 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5148 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5149 && TREE_UNSIGNED (type))
5150 DECL_ARG_TYPE (decl) = unsigned_type_node;
5152 DECL_ARG_TYPE (decl) = integer_type_node;
5155 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5157 else if (decl_context == FIELD)
5159 /* Structure field. It may not be a function. */
5161 if (TREE_CODE (type) == FUNCTION_TYPE)
5163 error ("field `%s' declared as a function", name);
5164 type = build_pointer_type (type);
5166 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5168 error ("field `%s' has incomplete type", name);
5169 type = error_mark_node;
5171 /* Move type qualifiers down to element of an array. */
5172 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5174 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5176 TYPE_DOMAIN (type));
5177 #if 0 /* Leave the field const or volatile as well. */
5178 constp = volatilep = 0;
5181 decl = build_decl (FIELD_DECL, declarator, type);
5183 C_DECL_VARIABLE_SIZE (decl) = 1;
5185 else if (TREE_CODE (type) == FUNCTION_TYPE)
5187 /* Every function declaration is "external"
5188 except for those which are inside a function body
5189 in which `auto' is used.
5190 That is a case not specified by ANSI C,
5191 and we use it for forward declarations for nested functions. */
5192 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5193 || current_binding_level == global_binding_level);
5195 if (specbits & (1 << (int) RID_AUTO)
5196 && (pedantic || current_binding_level == global_binding_level))
5197 pedwarn ("invalid storage class for function `%s'", name);
5198 if (specbits & (1 << (int) RID_REGISTER))
5199 error ("invalid storage class for function `%s'", name);
5200 /* Function declaration not at top level.
5201 Storage classes other than `extern' are not allowed
5202 and `extern' makes no difference. */
5203 if (current_binding_level != global_binding_level
5204 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5206 pedwarn ("invalid storage class for function `%s'", name);
5208 /* If this is a block level extern, it must live past the end
5209 of the function so that we can check it against other
5210 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5211 if (extern_ref && allocation_temporary_p ())
5212 end_temporary_allocation ();
5214 decl = build_decl (FUNCTION_DECL, declarator, type);
5215 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5217 if (pedantic && (constp || volatilep)
5218 && ! DECL_IN_SYSTEM_HEADER (decl))
5219 pedwarn ("ANSI C forbids const or volatile functions");
5222 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5223 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5224 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5225 && ! DECL_IN_SYSTEM_HEADER (decl))
5226 pedwarn ("ANSI C forbids const or volatile void function return type");
5229 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5230 warning ("`noreturn' function returns non-void value");
5233 DECL_EXTERNAL (decl) = 1;
5234 /* Record absence of global scope for `static' or `auto'. */
5236 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5238 /* Record presence of `inline', if it is reasonable. */
5241 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5242 warning ("cannot inline function `main'");
5244 /* Assume that otherwise the function can be inlined. */
5245 DECL_INLINE (decl) = 1;
5247 if (specbits & (1 << (int) RID_EXTERN))
5248 current_extern_inline = 1;
5253 /* It's a variable. */
5254 /* An uninitialized decl with `extern' is a reference. */
5255 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5257 /* Move type qualifiers down to element of an array. */
5258 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5260 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5262 TYPE_DOMAIN (type));
5263 #if 0 /* Leave the variable const or volatile as well. */
5264 constp = volatilep = 0;
5268 /* If this is a block level extern, it must live past the end
5269 of the function so that we can check it against other
5270 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5271 if (extern_ref && allocation_temporary_p ())
5272 end_temporary_allocation ();
5274 decl = build_decl (VAR_DECL, declarator, type);
5276 C_DECL_VARIABLE_SIZE (decl) = 1;
5279 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5281 DECL_EXTERNAL (decl) = extern_ref;
5282 /* At top level, the presence of a `static' or `register' storage
5283 class specifier, or the absence of all storage class specifiers
5284 makes this declaration a definition (perhaps tentative). Also,
5285 the absence of both `static' and `register' makes it public. */
5286 if (current_binding_level == global_binding_level)
5290 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5291 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5293 /* Not at top level, only `static' makes a static definition. */
5296 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5297 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5300 if (specbits & 1 << (int) RID_ITERATOR)
5301 ITERATOR_P (decl) = 1;
5304 /* Record `register' declaration for warnings on &
5305 and in case doing stupid register allocation. */
5307 if (specbits & (1 << (int) RID_REGISTER))
5308 DECL_REGISTER (decl) = 1;
5310 /* Record constancy and volatility. */
5313 TREE_READONLY (decl) = 1;
5316 TREE_SIDE_EFFECTS (decl) = 1;
5317 TREE_THIS_VOLATILE (decl) = 1;
5319 /* If a type has volatile components, it should be stored in memory.
5320 Otherwise, the fact that those components are volatile
5321 will be ignored, and would even crash the compiler. */
5322 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5323 mark_addressable (decl);
5331 /* Decode the parameter-list info for a function type or function definition.
5332 The argument is the value returned by `get_parm_info' (or made in parse.y
5333 if there is an identifier list instead of a parameter decl list).
5334 These two functions are separate because when a function returns
5335 or receives functions then each is called multiple times but the order
5336 of calls is different. The last call to `grokparms' is always the one
5337 that contains the formal parameter names of a function definition.
5339 Store in `last_function_parms' a chain of the decls of parms.
5340 Also store in `last_function_parm_tags' a chain of the struct, union,
5341 and enum tags declared among the parms.
5343 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5345 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5346 a mere declaration. A nonempty identifier-list gets an error message
5347 when FUNCDEF_FLAG is zero. */
5350 grokparms (parms_info, funcdef_flag)
5354 tree first_parm = TREE_CHAIN (parms_info);
5356 last_function_parms = TREE_PURPOSE (parms_info);
5357 last_function_parm_tags = TREE_VALUE (parms_info);
5359 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5360 && !in_system_header)
5361 warning ("function declaration isn't a prototype");
5364 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5367 pedwarn ("parameter names (without types) in function declaration");
5369 last_function_parms = first_parm;
5376 /* We no longer test FUNCDEF_FLAG.
5377 If the arg types are incomplete in a declaration,
5378 they must include undefined tags.
5379 These tags can never be defined in the scope of the declaration,
5380 so the types can never be completed,
5381 and no call can be compiled successfully. */
5383 /* In a fcn definition, arg types must be complete. */
5386 for (parm = last_function_parms, typelt = first_parm;
5388 parm = TREE_CHAIN (parm))
5389 /* Skip over any enumeration constants declared here. */
5390 if (TREE_CODE (parm) == PARM_DECL)
5392 /* Barf if the parameter itself has an incomplete type. */
5393 tree type = TREE_VALUE (typelt);
5394 if (TYPE_SIZE (type) == 0)
5396 if (funcdef_flag && DECL_NAME (parm) != 0)
5397 error ("parameter `%s' has incomplete type",
5398 IDENTIFIER_POINTER (DECL_NAME (parm)));
5400 warning ("parameter has incomplete type");
5403 TREE_VALUE (typelt) = error_mark_node;
5404 TREE_TYPE (parm) = error_mark_node;
5407 #if 0 /* This has been replaced by parm_tags_warning
5408 which uses a more accurate criterion for what to warn about. */
5411 /* Now warn if is a pointer to an incomplete type. */
5412 while (TREE_CODE (type) == POINTER_TYPE
5413 || TREE_CODE (type) == REFERENCE_TYPE)
5414 type = TREE_TYPE (type);
5415 type = TYPE_MAIN_VARIANT (type);
5416 if (TYPE_SIZE (type) == 0)
5418 if (DECL_NAME (parm) != 0)
5419 warning ("parameter `%s' points to incomplete type",
5420 IDENTIFIER_POINTER (DECL_NAME (parm)));
5422 warning ("parameter points to incomplete type");
5426 typelt = TREE_CHAIN (typelt);
5429 /* Allocate the list of types the way we allocate a type. */
5430 if (first_parm && ! TREE_PERMANENT (first_parm))
5432 /* Construct a copy of the list of types
5433 on the saveable obstack. */
5435 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5436 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5438 return nreverse (result);
5441 /* The list we have is permanent already. */
5447 /* Return a tree_list node with info on a parameter list just parsed.
5448 The TREE_PURPOSE is a chain of decls of those parms.
5449 The TREE_VALUE is a list of structure, union and enum tags defined.
5450 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5451 This tree_list node is later fed to `grokparms'.
5453 VOID_AT_END nonzero means append `void' to the end of the type-list.
5454 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5457 get_parm_info (void_at_end)
5460 register tree decl, t;
5461 register tree types = 0;
5463 tree tags = gettags ();
5464 tree parms = getdecls ();
5466 tree order = current_binding_level->parm_order;
5468 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5469 if (void_at_end && parms != 0
5470 && TREE_CHAIN (parms) == 0
5471 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5472 && DECL_NAME (parms) == 0)
5475 storedecls (NULL_TREE);
5476 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5477 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5480 /* Extract enumerator values and other non-parms declared with the parms.
5481 Likewise any forward parm decls that didn't have real parm decls. */
5482 for (decl = parms; decl; )
5484 tree next = TREE_CHAIN (decl);
5486 if (TREE_CODE (decl) != PARM_DECL)
5488 TREE_CHAIN (decl) = new_parms;
5491 else if (TREE_ASM_WRITTEN (decl))
5493 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5494 TREE_CHAIN (decl) = new_parms;
5500 /* Put the parm decls back in the order they were in in the parm list. */
5501 for (t = order; t; t = TREE_CHAIN (t))
5504 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5506 TREE_CHAIN (TREE_VALUE (t)) = 0;
5509 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5512 /* Store the parmlist in the binding level since the old one
5513 is no longer a valid list. (We have changed the chain pointers.) */
5514 storedecls (new_parms);
5516 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5517 /* There may also be declarations for enumerators if an enumeration
5518 type is declared among the parms. Ignore them here. */
5519 if (TREE_CODE (decl) == PARM_DECL)
5521 /* Since there is a prototype,
5522 args are passed in their declared types. */
5523 tree type = TREE_TYPE (decl);
5524 DECL_ARG_TYPE (decl) = type;
5525 #ifdef PROMOTE_PROTOTYPES
5526 if ((TREE_CODE (type) == INTEGER_TYPE
5527 || TREE_CODE (type) == ENUMERAL_TYPE)
5528 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5529 DECL_ARG_TYPE (decl) = integer_type_node;
5532 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5533 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5534 && DECL_NAME (decl) == 0)
5536 error ("`void' in parameter list must be the entire list");
5542 return saveable_tree_cons (new_parms, tags,
5543 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5545 return saveable_tree_cons (new_parms, tags, nreverse (types));
5548 /* At end of parameter list, warn about any struct, union or enum tags
5549 defined within. Do so because these types cannot ever become complete. */
5552 parmlist_tags_warning ()
5557 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5559 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5560 /* An anonymous union parm type is meaningful as a GNU extension.
5561 So don't warn for that. */
5562 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5564 if (TREE_PURPOSE (elt) != 0)
5565 warning ("`%s %s' declared inside parameter list",
5566 (code == RECORD_TYPE ? "struct"
5567 : code == UNION_TYPE ? "union"
5569 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5571 warning ("anonymous %s declared inside parameter list",
5572 (code == RECORD_TYPE ? "struct"
5573 : code == UNION_TYPE ? "union"
5578 warning ("its scope is only this definition or declaration,");
5579 warning ("which is probably not what you want.");
5585 /* Get the struct, enum or union (CODE says which) with tag NAME.
5586 Define the tag as a forward-reference if it is not defined. */
5589 xref_tag (code, name)
5590 enum tree_code code;
5593 int temporary = allocation_temporary_p ();
5595 /* If a cross reference is requested, look up the type
5596 already defined for this tag and return it. */
5598 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5599 /* Even if this is the wrong type of tag, return what we found.
5600 There will be an error message anyway, from pending_xref_error.
5601 If we create an empty xref just for an invalid use of the type,
5602 the main result is to create lots of superfluous error messages. */
5606 push_obstacks_nochange ();
5608 if (current_binding_level == global_binding_level && temporary)
5609 end_temporary_allocation ();
5611 /* If no such tag is yet defined, create a forward-reference node
5612 and record it as the "definition".
5613 When a real declaration of this type is found,
5614 the forward-reference will be altered into a real type. */
5616 ref = make_node (code);
5617 if (code == ENUMERAL_TYPE)
5619 /* (In ANSI, Enums can be referred to only if already defined.) */
5621 pedwarn ("ANSI C forbids forward references to `enum' types");
5622 /* Give the type a default layout like unsigned int
5623 to avoid crashing if it does not get defined. */
5624 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5625 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5626 TREE_UNSIGNED (ref) = 1;
5627 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5628 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5629 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5632 pushtag (name, ref);
5639 /* Make sure that the tag NAME is defined *in the current binding level*
5640 at least as a forward reference.
5641 CODE says which kind of tag NAME ought to be.
5643 We also do a push_obstacks_nochange
5644 whose matching pop is in finish_struct. */
5647 start_struct (code, name)
5648 enum tree_code code;
5651 /* If there is already a tag defined at this binding level
5652 (as a forward reference), just return it. */
5654 register tree ref = 0;
5656 push_obstacks_nochange ();
5657 if (current_binding_level == global_binding_level)
5658 end_temporary_allocation ();
5661 ref = lookup_tag (code, name, current_binding_level, 1);
5662 if (ref && TREE_CODE (ref) == code)
5664 C_TYPE_BEING_DEFINED (ref) = 1;
5665 TYPE_PACKED (ref) = flag_pack_struct;
5666 if (TYPE_FIELDS (ref))
5667 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5668 : "redefinition of `struct %s'"),
5669 IDENTIFIER_POINTER (name));
5674 /* Otherwise create a forward-reference just so the tag is in scope. */
5676 ref = make_node (code);
5677 pushtag (name, ref);
5678 C_TYPE_BEING_DEFINED (ref) = 1;
5679 TYPE_PACKED (ref) = flag_pack_struct;
5683 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5684 of a structure component, returning a FIELD_DECL node.
5685 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5687 This is done during the parsing of the struct declaration.
5688 The FIELD_DECL nodes are chained together and the lot of them
5689 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5692 grokfield (filename, line, declarator, declspecs, width)
5695 tree declarator, declspecs, width;
5699 /* The corresponding pop_obstacks is in finish_decl. */
5700 push_obstacks_nochange ();
5702 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5704 finish_decl (value, NULL_TREE, NULL_TREE);
5705 DECL_INITIAL (value) = width;
5707 maybe_objc_check_decl (value);
5711 /* Function to help qsort sort FIELD_DECLs by name order. */
5714 field_decl_cmp (xp, yp)
5715 const GENERIC_PTR xp;
5716 const GENERIC_PTR yp;
5718 tree *x = (tree *)xp, *y = (tree *)yp;
5720 if (DECL_NAME (*x) == DECL_NAME (*y))
5722 if (DECL_NAME (*x) == NULL)
5724 if (DECL_NAME (*y) == NULL)
5726 if (DECL_NAME (*x) < DECL_NAME (*y))
5731 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5732 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5733 ATTRIBUTES are attributes to be applied to the structure.
5735 We also do a pop_obstacks to match the push in start_struct. */
5738 finish_struct (t, fieldlist, attributes)
5745 int toplevel = global_binding_level == current_binding_level;
5747 /* If this type was previously laid out as a forward reference,
5748 make sure we lay it out again. */
5752 decl_attributes (t, attributes, NULL_TREE);
5754 /* Nameless union parm types are useful as GCC extension. */
5755 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5756 /* Otherwise, warn about any struct or union def. in parmlist. */
5757 if (in_parm_level_p ())
5760 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5761 : "structure defined inside parms"));
5762 else if (! flag_traditional)
5763 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5764 : "structure defined inside parms"));
5767 old_momentary = suspend_momentary ();
5771 for (x = fieldlist; x; x = TREE_CHAIN (x))
5772 if (DECL_NAME (x) != 0)
5776 pedwarn ("%s has no %smembers",
5777 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5778 (fieldlist ? "named " : ""));
5781 /* Install struct as DECL_CONTEXT of each field decl.
5782 Also process specified field sizes.
5783 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5784 The specified size is found in the DECL_INITIAL.
5785 Store 0 there, except for ": 0" fields (so we can find them
5786 and delete them, below). */
5788 for (x = fieldlist; x; x = TREE_CHAIN (x))
5790 DECL_CONTEXT (x) = t;
5791 DECL_PACKED (x) |= TYPE_PACKED (t);
5792 DECL_FIELD_SIZE (x) = 0;
5794 /* If any field is const, the structure type is pseudo-const. */
5795 if (TREE_READONLY (x))
5796 C_TYPE_FIELDS_READONLY (t) = 1;
5799 /* A field that is pseudo-const makes the structure likewise. */
5800 tree t1 = TREE_TYPE (x);
5801 while (TREE_CODE (t1) == ARRAY_TYPE)
5802 t1 = TREE_TYPE (t1);
5803 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5804 && C_TYPE_FIELDS_READONLY (t1))
5805 C_TYPE_FIELDS_READONLY (t) = 1;
5808 /* Any field that is volatile means variables of this type must be
5809 treated in some ways as volatile. */
5810 if (TREE_THIS_VOLATILE (x))
5811 C_TYPE_FIELDS_VOLATILE (t) = 1;
5813 /* Any field of nominal variable size implies structure is too. */
5814 if (C_DECL_VARIABLE_SIZE (x))
5815 C_TYPE_VARIABLE_SIZE (t) = 1;
5817 /* Detect invalid nested redefinition. */
5818 if (TREE_TYPE (x) == t)
5819 error ("nested redefinition of `%s'",
5820 IDENTIFIER_POINTER (TYPE_NAME (t)));
5822 /* Detect invalid bit-field size. */
5823 if (DECL_INITIAL (x))
5824 STRIP_NOPS (DECL_INITIAL (x));
5825 if (DECL_INITIAL (x))
5827 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5828 constant_expression_warning (DECL_INITIAL (x));
5831 error_with_decl (x, "bit-field `%s' width not an integer constant");
5832 DECL_INITIAL (x) = NULL;
5836 /* Detect invalid bit-field type. */
5837 if (DECL_INITIAL (x)
5838 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5839 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5841 error_with_decl (x, "bit-field `%s' has invalid type");
5842 DECL_INITIAL (x) = NULL;
5844 if (DECL_INITIAL (x) && pedantic
5845 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5846 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5847 /* Accept an enum that's equivalent to int or unsigned int. */
5848 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5849 && (TYPE_PRECISION (TREE_TYPE (x))
5850 == TYPE_PRECISION (integer_type_node))))
5851 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5853 /* Detect and ignore out of range field width. */
5854 if (DECL_INITIAL (x))
5856 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5858 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5860 DECL_INITIAL (x) = NULL;
5861 error_with_decl (x, "negative width in bit-field `%s'");
5863 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5864 || width > TYPE_PRECISION (TREE_TYPE (x)))
5866 DECL_INITIAL (x) = NULL;
5867 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5869 else if (width == 0 && DECL_NAME (x) != 0)
5871 error_with_decl (x, "zero width for bit-field `%s'");
5872 DECL_INITIAL (x) = NULL;
5876 /* Process valid field width. */
5877 if (DECL_INITIAL (x))
5879 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5881 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5882 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5883 TREE_UNSIGNED (TREE_TYPE (x)))
5884 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5885 TREE_UNSIGNED (TREE_TYPE (x)))))
5886 warning_with_decl (x, "`%s' is narrower than values of its type");
5888 DECL_FIELD_SIZE (x) = width;
5889 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5890 DECL_INITIAL (x) = NULL;
5894 /* field size 0 => force desired amount of alignment. */
5895 #ifdef EMPTY_FIELD_BOUNDARY
5896 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5898 #ifdef PCC_BITFIELD_TYPE_MATTERS
5899 if (PCC_BITFIELD_TYPE_MATTERS)
5900 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5901 TYPE_ALIGN (TREE_TYPE (x)));
5905 else if (TREE_TYPE (x) != error_mark_node)
5907 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5908 : TYPE_ALIGN (TREE_TYPE (x)));
5909 /* Non-bit-fields are aligned for their type, except packed
5910 fields which require only BITS_PER_UNIT alignment. */
5911 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5915 /* Now DECL_INITIAL is null on all members. */
5917 /* Delete all duplicate fields from the fieldlist */
5918 for (x = fieldlist; x && TREE_CHAIN (x);)
5919 /* Anonymous fields aren't duplicates. */
5920 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5924 register tree y = fieldlist;
5928 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5934 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5936 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5937 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5939 else x = TREE_CHAIN (x);
5942 /* Now we have the nearly final fieldlist. Record it,
5943 then lay out the structure or union (including the fields). */
5945 TYPE_FIELDS (t) = fieldlist;
5949 /* Delete all zero-width bit-fields from the front of the fieldlist */
5951 && DECL_INITIAL (fieldlist))
5952 fieldlist = TREE_CHAIN (fieldlist);
5953 /* Delete all such members from the rest of the fieldlist */
5954 for (x = fieldlist; x;)
5956 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5957 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5958 else x = TREE_CHAIN (x);
5961 /* Now we have the truly final field list.
5962 Store it in this type and in the variants. */
5964 TYPE_FIELDS (t) = fieldlist;
5966 /* If there are lots of fields, sort so we can look through them fast.
5967 We arbitrarily consider 16 or more elts to be "a lot". */
5971 for (x = fieldlist; x; x = TREE_CHAIN (x))
5982 len += list_length (x);
5983 /* Use the same allocation policy here that make_node uses, to
5984 ensure that this lives as long as the rest of the struct decl.
5985 All decls in an inline function need to be saved. */
5986 if (allocation_temporary_p ())
5987 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5989 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5991 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5992 TYPE_LANG_SPECIFIC (t)->len = len;
5994 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5996 for (x = fieldlist; x; x = TREE_CHAIN (x))
5997 field_array[len++] = x;
5999 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6003 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6005 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6006 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6007 TYPE_ALIGN (x) = TYPE_ALIGN (t);
6010 /* If this was supposed to be a transparent union, but we can't
6011 make it one, warn and turn off the flag. */
6012 if (TREE_CODE (t) == UNION_TYPE
6013 && TYPE_TRANSPARENT_UNION (t)
6014 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
6016 TYPE_TRANSPARENT_UNION (t) = 0;
6017 warning ("union cannot be made transparent");
6020 /* If this structure or union completes the type of any previous
6021 variable declaration, lay it out and output its rtl. */
6023 if (current_binding_level->n_incomplete != 0)
6026 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
6028 if (TREE_TYPE (decl) == t
6029 && TREE_CODE (decl) != TYPE_DECL)
6031 layout_decl (decl, 0);
6032 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6033 maybe_objc_check_decl (decl);
6034 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6037 --current_binding_level->n_incomplete;
6039 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6040 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6042 tree element = TREE_TYPE (decl);
6043 while (TREE_CODE (element) == ARRAY_TYPE)
6044 element = TREE_TYPE (element);
6046 layout_array_type (TREE_TYPE (decl));
6051 resume_momentary (old_momentary);
6053 /* Finish debugging output for this type. */
6054 rest_of_type_compilation (t, toplevel);
6056 /* The matching push is in start_struct. */
6062 /* Lay out the type T, and its element type, and so on. */
6065 layout_array_type (t)
6068 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6069 layout_array_type (TREE_TYPE (t));
6073 /* Begin compiling the definition of an enumeration type.
6074 NAME is its name (or null if anonymous).
6075 Returns the type object, as yet incomplete.
6076 Also records info about it so that build_enumerator
6077 may be used to declare the individual values as they are read. */
6083 register tree enumtype = 0;
6085 /* If this is the real definition for a previous forward reference,
6086 fill in the contents in the same object that used to be the
6087 forward reference. */
6090 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6092 /* The corresponding pop_obstacks is in finish_enum. */
6093 push_obstacks_nochange ();
6094 /* If these symbols and types are global, make them permanent. */
6095 if (current_binding_level == global_binding_level)
6096 end_temporary_allocation ();
6098 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6100 enumtype = make_node (ENUMERAL_TYPE);
6101 pushtag (name, enumtype);
6104 C_TYPE_BEING_DEFINED (enumtype) = 1;
6106 if (TYPE_VALUES (enumtype) != 0)
6108 /* This enum is a named one that has been declared already. */
6109 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6111 /* Completely replace its old definition.
6112 The old enumerators remain defined, however. */
6113 TYPE_VALUES (enumtype) = 0;
6116 enum_next_value = integer_zero_node;
6119 if (flag_short_enums)
6120 TYPE_PACKED (enumtype) = 1;
6125 /* After processing and defining all the values of an enumeration type,
6126 install their decls in the enumeration type and finish it off.
6127 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6128 and ATTRIBUTES are the specified attributes.
6129 Returns ENUMTYPE. */
6132 finish_enum (enumtype, values, attributes)
6137 register tree pair, tem;
6138 tree minnode = 0, maxnode = 0;
6139 int lowprec, highprec, precision;
6140 int toplevel = global_binding_level == current_binding_level;
6142 if (in_parm_level_p ())
6143 warning ("enum defined inside parms");
6145 decl_attributes (enumtype, attributes, NULL_TREE);
6147 /* Calculate the maximum value of any enumerator in this type. */
6149 if (values == error_mark_node)
6150 minnode = maxnode = integer_zero_node;
6152 for (pair = values; pair; pair = TREE_CHAIN (pair))
6154 tree value = TREE_VALUE (pair);
6156 minnode = maxnode = TREE_VALUE (pair);
6159 if (tree_int_cst_lt (maxnode, value))
6161 if (tree_int_cst_lt (value, minnode))
6166 TYPE_MIN_VALUE (enumtype) = minnode;
6167 TYPE_MAX_VALUE (enumtype) = maxnode;
6169 /* An enum can have some negative values; then it is signed. */
6170 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6172 /* Determine the precision this type needs. */
6174 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6175 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6176 precision = MAX (lowprec, highprec);
6178 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6180 tree narrowest = type_for_size (precision, 1);
6183 warning ("enumeration values exceed range of largest integer");
6184 narrowest = long_long_integer_type_node;
6187 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6190 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6192 TYPE_SIZE (enumtype) = 0;
6193 layout_type (enumtype);
6195 if (values != error_mark_node)
6197 /* Change the type of the enumerators to be the enum type.
6198 Formerly this was done only for enums that fit in an int,
6199 but the comment said it was done only for enums wider than int.
6200 It seems necessary to do this for wide enums,
6201 and best not to change what's done for ordinary narrower ones. */
6202 for (pair = values; pair; pair = TREE_CHAIN (pair))
6204 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6205 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6206 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6207 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6210 /* Replace the decl nodes in VALUES with their names. */
6211 for (pair = values; pair; pair = TREE_CHAIN (pair))
6212 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6214 TYPE_VALUES (enumtype) = values;
6217 /* Fix up all variant types of this enum type. */
6218 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6220 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6221 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6222 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6223 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6224 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6225 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6226 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6227 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6228 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6231 /* Finish debugging output for this type. */
6232 rest_of_type_compilation (enumtype, toplevel);
6234 /* This matches a push in start_enum. */
6240 /* Build and install a CONST_DECL for one value of the
6241 current enumeration type (one that was begun with start_enum).
6242 Return a tree-list containing the CONST_DECL and its value.
6243 Assignment of sequential values by default is handled here. */
6246 build_enumerator (name, value)
6249 register tree decl, type;
6251 /* Validate and default VALUE. */
6253 /* Remove no-op casts from the value. */
6255 STRIP_TYPE_NOPS (value);
6259 if (TREE_CODE (value) == INTEGER_CST)
6261 value = default_conversion (value);
6262 constant_expression_warning (value);
6266 error ("enumerator value for `%s' not integer constant",
6267 IDENTIFIER_POINTER (name));
6272 /* Default based on previous value. */
6273 /* It should no longer be possible to have NON_LVALUE_EXPR
6277 value = enum_next_value;
6279 error ("overflow in enumeration values");
6282 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6284 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6285 value = integer_zero_node;
6288 /* Set basis for default for next value. */
6289 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6290 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6292 /* Now create a declaration for the enum value name. */
6294 type = TREE_TYPE (value);
6295 type = type_for_size (MAX (TYPE_PRECISION (type),
6296 TYPE_PRECISION (integer_type_node)),
6298 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6299 && TREE_UNSIGNED (type)));
6301 decl = build_decl (CONST_DECL, name, type);
6302 DECL_INITIAL (decl) = value;
6303 TREE_TYPE (value) = type;
6306 return saveable_tree_cons (decl, value, NULL_TREE);
6309 /* Create the FUNCTION_DECL for a function definition.
6310 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6311 the declaration; they describe the function's name and the type it returns,
6312 but twisted together in a fashion that parallels the syntax of C.
6314 This function creates a binding context for the function body
6315 as well as setting up the FUNCTION_DECL in current_function_decl.
6317 Returns 1 on success. If the DECLARATOR is not suitable for a function
6318 (it defines a datum instead), we return 0, which tells
6319 yyparse to report a parse error.
6321 NESTED is nonzero for a function nested within another function. */
6324 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6325 tree declarator, declspecs, prefix_attributes, attributes;
6328 tree decl1, old_decl;
6330 int old_immediate_size_expand = immediate_size_expand;
6332 current_function_returns_value = 0; /* Assume, until we see it does. */
6333 current_function_returns_null = 0;
6334 warn_about_return_type = 0;
6335 current_extern_inline = 0;
6336 c_function_varargs = 0;
6338 shadowed_labels = 0;
6340 /* Don't expand any sizes in the return type of the function. */
6341 immediate_size_expand = 0;
6343 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6345 /* If the declarator is not suitable for a function definition,
6346 cause a syntax error. */
6349 immediate_size_expand = old_immediate_size_expand;
6353 decl_attributes (decl1, prefix_attributes, attributes);
6355 announce_function (decl1);
6357 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6359 error ("return-type is an incomplete type");
6360 /* Make it return void instead. */
6362 = build_function_type (void_type_node,
6363 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6366 if (warn_about_return_type)
6367 warning ("return-type defaults to `int'");
6369 /* Save the parm names or decls from this function's declarator
6370 where store_parm_decls will find them. */
6371 current_function_parms = last_function_parms;
6372 current_function_parm_tags = last_function_parm_tags;
6374 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6375 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6376 DECL_INITIAL (decl1) = error_mark_node;
6378 /* If this definition isn't a prototype and we had a prototype declaration
6379 before, copy the arg type info from that prototype.
6380 But not if what we had before was a builtin function. */
6381 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6382 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6383 && !DECL_BUILT_IN (old_decl)
6384 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6385 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6386 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6388 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6389 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6390 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6393 /* If there is no explicit declaration, look for any out-of-scope implicit
6396 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6398 /* Optionally warn of old-fashioned def with no previous prototype. */
6399 if (warn_strict_prototypes
6400 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6401 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6402 warning ("function declaration isn't a prototype");
6403 /* Optionally warn of any global def with no previous prototype. */
6404 else if (warn_missing_prototypes
6405 && TREE_PUBLIC (decl1)
6406 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6407 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6408 warning_with_decl (decl1, "no previous prototype for `%s'");
6409 /* Optionally warn of any def with no previous prototype
6410 if the function has already been used. */
6411 else if (warn_missing_prototypes
6412 && old_decl != 0 && TREE_USED (old_decl)
6413 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6414 warning_with_decl (decl1,
6415 "`%s' was used with no prototype before its definition");
6416 /* Optionally warn of any global def with no previous declaration. */
6417 else if (warn_missing_declarations
6418 && TREE_PUBLIC (decl1)
6420 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6421 warning_with_decl (decl1, "no previous declaration for `%s'");
6422 /* Optionally warn of any def with no previous declaration
6423 if the function has already been used. */
6424 else if (warn_missing_declarations
6425 && old_decl != 0 && TREE_USED (old_decl)
6426 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6427 warning_with_decl (decl1,
6428 "`%s' was used with no declaration before its definition");
6430 /* This is a definition, not a reference.
6431 So normally clear DECL_EXTERNAL.
6432 However, `extern inline' acts like a declaration
6433 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6434 DECL_EXTERNAL (decl1) = current_extern_inline;
6436 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6437 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6440 /* This function exists in static storage.
6441 (This does not mean `static' in the C sense!) */
6442 TREE_STATIC (decl1) = 1;
6444 /* A nested function is not global. */
6445 if (current_function_decl != 0)
6446 TREE_PUBLIC (decl1) = 0;
6448 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6450 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6455 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6456 != integer_type_node)
6457 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6459 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6460 args = TREE_CHAIN (args))
6462 tree type = args ? TREE_VALUE (args) : 0;
6464 if (type == void_type_node)
6471 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6472 pedwarn_with_decl (decl1,
6473 "first argument of `%s' should be `int'");
6477 if (TREE_CODE (type) != POINTER_TYPE
6478 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6479 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6481 pedwarn_with_decl (decl1,
6482 "second argument of `%s' should be `char **'");
6486 if (TREE_CODE (type) != POINTER_TYPE
6487 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6488 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6490 pedwarn_with_decl (decl1,
6491 "third argument of `%s' should probably be `char **'");
6496 /* It is intentional that this message does not mention the third
6497 argument, which is warned for only pedantically, because it's
6498 blessed by mention in an appendix of the standard. */
6499 if (argct > 0 && (argct < 2 || argct > 3))
6500 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6502 if (argct == 3 && pedantic)
6503 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6505 if (! TREE_PUBLIC (decl1))
6506 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6509 /* Record the decl so that the function name is defined.
6510 If we already have a decl for this name, and it is a FUNCTION_DECL,
6511 use the old decl. */
6513 current_function_decl = pushdecl (decl1);
6516 declare_parm_level (1);
6517 current_binding_level->subblocks_tag_transparent = 1;
6519 make_function_rtl (current_function_decl);
6521 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6522 /* Promote the value to int before returning it. */
6523 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6525 /* It retains unsignedness if traditional
6526 or if not really getting wider. */
6527 if (TREE_UNSIGNED (restype)
6528 && (flag_traditional
6529 || (TYPE_PRECISION (restype)
6530 == TYPE_PRECISION (integer_type_node))))
6531 restype = unsigned_type_node;
6533 restype = integer_type_node;
6535 DECL_RESULT (current_function_decl)
6536 = build_decl (RESULT_DECL, NULL_TREE, restype);
6539 /* Allocate further tree nodes temporarily during compilation
6540 of this function only. */
6541 temporary_allocation ();
6543 /* If this fcn was already referenced via a block-scope `extern' decl
6544 (or an implicit decl), propagate certain information about the usage. */
6545 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6546 TREE_ADDRESSABLE (current_function_decl) = 1;
6548 immediate_size_expand = old_immediate_size_expand;
6553 /* Record that this function is going to be a varargs function.
6554 This is called before store_parm_decls, which is too early
6555 to call mark_varargs directly. */
6560 c_function_varargs = 1;
6563 /* Store the parameter declarations into the current function declaration.
6564 This is called after parsing the parameter declarations, before
6565 digesting the body of the function.
6567 For an old-style definition, modify the function's type
6568 to specify at least the number of arguments. */
6573 register tree fndecl = current_function_decl;
6576 /* This is either a chain of PARM_DECLs (if a prototype was used)
6577 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6578 tree specparms = current_function_parms;
6580 /* This is a list of types declared among parms in a prototype. */
6581 tree parmtags = current_function_parm_tags;
6583 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6584 register tree parmdecls = getdecls ();
6586 /* This is a chain of any other decls that came in among the parm
6587 declarations. If a parm is declared with enum {foo, bar} x;
6588 then CONST_DECLs for foo and bar are put here. */
6591 /* Nonzero if this definition is written with a prototype. */
6594 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6596 /* This case is when the function was defined with an ANSI prototype.
6597 The parms already have decls, so we need not do anything here
6598 except record them as in effect
6599 and complain if any redundant old-style parm decls were written. */
6610 error_with_decl (fndecl,
6611 "parm types given both in parmlist and separately");
6612 /* Get rid of the erroneous decls; don't keep them on
6613 the list of parms, since they might not be PARM_DECLs. */
6614 for (decl = current_binding_level->names;
6615 decl; decl = TREE_CHAIN (decl))
6616 if (DECL_NAME (decl))
6617 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6618 for (link = current_binding_level->shadowed;
6619 link; link = TREE_CHAIN (link))
6620 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6621 current_binding_level->names = 0;
6622 current_binding_level->shadowed = 0;
6625 specparms = nreverse (specparms);
6626 for (parm = specparms; parm; parm = next)
6628 next = TREE_CHAIN (parm);
6629 if (TREE_CODE (parm) == PARM_DECL)
6631 if (DECL_NAME (parm) == 0)
6632 error_with_decl (parm, "parameter name omitted");
6633 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6635 error_with_decl (parm, "parameter `%s' declared void");
6636 /* Change the type to error_mark_node so this parameter
6637 will be ignored by assign_parms. */
6638 TREE_TYPE (parm) = error_mark_node;
6644 /* If we find an enum constant or a type tag,
6645 put it aside for the moment. */
6646 TREE_CHAIN (parm) = 0;
6647 others = chainon (others, parm);
6651 /* Get the decls in their original chain order
6652 and record in the function. */
6653 DECL_ARGUMENTS (fndecl) = getdecls ();
6656 /* If this function takes a variable number of arguments,
6657 add a phony parameter to the end of the parm list,
6658 to represent the position of the first unnamed argument. */
6659 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6662 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6663 /* Let's hope the address of the unnamed parm
6664 won't depend on its type. */
6665 TREE_TYPE (dummy) = integer_type_node;
6666 DECL_ARG_TYPE (dummy) = integer_type_node;
6667 DECL_ARGUMENTS (fndecl)
6668 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6672 /* Now pushdecl the enum constants. */
6673 for (parm = others; parm; parm = next)
6675 next = TREE_CHAIN (parm);
6676 if (DECL_NAME (parm) == 0)
6678 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6680 else if (TREE_CODE (parm) != PARM_DECL)
6684 storetags (chainon (parmtags, gettags ()));
6688 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6689 each with a parm name as the TREE_VALUE.
6691 PARMDECLS is a chain of declarations for parameters.
6692 Warning! It can also contain CONST_DECLs which are not parameters
6693 but are names of enumerators of any enum types
6694 declared among the parameters.
6696 First match each formal parameter name with its declaration.
6697 Associate decls with the names and store the decls
6698 into the TREE_PURPOSE slots. */
6700 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6701 DECL_RESULT (parm) = 0;
6703 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6705 register tree tail, found = NULL;
6707 if (TREE_VALUE (parm) == 0)
6709 error_with_decl (fndecl, "parameter name missing from parameter list");
6710 TREE_PURPOSE (parm) = 0;
6714 /* See if any of the parmdecls specifies this parm by name.
6715 Ignore any enumerator decls. */
6716 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6717 if (DECL_NAME (tail) == TREE_VALUE (parm)
6718 && TREE_CODE (tail) == PARM_DECL)
6724 /* If declaration already marked, we have a duplicate name.
6725 Complain, and don't use this decl twice. */
6726 if (found && DECL_RESULT (found) != 0)
6728 error_with_decl (found, "multiple parameters named `%s'");
6732 /* If the declaration says "void", complain and ignore it. */
6733 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6735 error_with_decl (found, "parameter `%s' declared void");
6736 TREE_TYPE (found) = integer_type_node;
6737 DECL_ARG_TYPE (found) = integer_type_node;
6738 layout_decl (found, 0);
6741 /* Traditionally, a parm declared float is actually a double. */
6742 if (found && flag_traditional
6743 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6745 TREE_TYPE (found) = double_type_node;
6746 DECL_ARG_TYPE (found) = double_type_node;
6747 layout_decl (found, 0);
6750 /* If no declaration found, default to int. */
6753 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6755 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6756 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6757 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6759 warning_with_decl (found, "type of `%s' defaults to `int'");
6763 TREE_PURPOSE (parm) = found;
6765 /* Mark this decl as "already found" -- see test, above.
6766 It is safe to use DECL_RESULT for this
6767 since it is not used in PARM_DECLs or CONST_DECLs. */
6768 DECL_RESULT (found) = error_mark_node;
6771 /* Put anything which is on the parmdecls chain and which is
6772 not a PARM_DECL onto the list NONPARMS. (The types of
6773 non-parm things which might appear on the list include
6774 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6775 any actual PARM_DECLs not matched with any names. */
6778 for (parm = parmdecls; parm; )
6780 tree next = TREE_CHAIN (parm);
6781 TREE_CHAIN (parm) = 0;
6783 if (TREE_CODE (parm) != PARM_DECL)
6784 nonparms = chainon (nonparms, parm);
6787 /* Complain about args with incomplete types. */
6788 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6790 error_with_decl (parm, "parameter `%s' has incomplete type");
6791 TREE_TYPE (parm) = error_mark_node;
6794 if (DECL_RESULT (parm) == 0)
6796 error_with_decl (parm,
6797 "declaration for parameter `%s' but no such parameter");
6798 /* Pretend the parameter was not missing.
6799 This gets us to a standard state and minimizes
6800 further error messages. */
6802 = chainon (specparms,
6803 tree_cons (parm, NULL_TREE, NULL_TREE));
6810 /* Chain the declarations together in the order of the list of names. */
6811 /* Store that chain in the function decl, replacing the list of names. */
6813 DECL_ARGUMENTS (fndecl) = 0;
6816 for (last = 0; parm; parm = TREE_CHAIN (parm))
6817 if (TREE_PURPOSE (parm))
6820 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6822 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6823 last = TREE_PURPOSE (parm);
6824 TREE_CHAIN (last) = 0;
6828 /* If there was a previous prototype,
6829 set the DECL_ARG_TYPE of each argument according to
6830 the type previously specified, and report any mismatches. */
6832 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6835 for (parm = DECL_ARGUMENTS (fndecl),
6836 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6837 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6838 != void_type_node));
6839 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6841 if (parm == 0 || type == 0
6842 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6844 error ("number of arguments doesn't match prototype");
6845 error_with_file_and_line (current_function_prototype_file,
6846 current_function_prototype_line,
6847 "prototype declaration");
6850 /* Type for passing arg must be consistent
6851 with that declared for the arg. */
6852 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6854 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6855 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6857 /* Adjust argument to match prototype. E.g. a previous
6858 `int foo(float);' prototype causes
6859 `int foo(x) float x; {...}' to be treated like
6860 `int foo(float x) {...}'. This is particularly
6861 useful for argument types like uid_t. */
6862 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6863 #ifdef PROMOTE_PROTOTYPES
6864 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6865 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6866 && TYPE_PRECISION (TREE_TYPE (parm))
6867 < TYPE_PRECISION (integer_type_node))
6868 DECL_ARG_TYPE (parm) = integer_type_node;
6872 pedwarn ("promoted argument `%s' doesn't match prototype",
6873 IDENTIFIER_POINTER (DECL_NAME (parm)));
6874 warning_with_file_and_line
6875 (current_function_prototype_file,
6876 current_function_prototype_line,
6877 "prototype declaration");
6880 /* If -traditional, allow `int' argument to match
6881 `unsigned' prototype. */
6882 else if (! (flag_traditional
6883 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6884 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6886 error ("argument `%s' doesn't match prototype",
6887 IDENTIFIER_POINTER (DECL_NAME (parm)));
6888 error_with_file_and_line (current_function_prototype_file,
6889 current_function_prototype_line,
6890 "prototype declaration");
6894 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6897 /* Otherwise, create a prototype that would match. */
6901 tree actual = 0, last = 0, type;
6903 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6905 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6908 TREE_CHAIN (last) = type;
6913 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6915 TREE_CHAIN (last) = type;
6919 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6920 of the type of this function, but we need to avoid having this
6921 affect the types of other similarly-typed functions, so we must
6922 first force the generation of an identical (but separate) type
6923 node for the relevant function type. The new node we create
6924 will be a variant of the main variant of the original function
6927 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6929 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6932 /* Now store the final chain of decls for the arguments
6933 as the decl-chain of the current lexical scope.
6934 Put the enumerators in as well, at the front so that
6935 DECL_ARGUMENTS is not modified. */
6937 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6940 /* Make sure the binding level for the top of the function body
6941 gets a BLOCK if there are any in the function.
6942 Otherwise, the dbx output is wrong. */
6944 keep_next_if_subblocks = 1;
6946 /* ??? This might be an improvement,
6947 but needs to be thought about some more. */
6949 keep_next_level_flag = 1;
6952 /* Write a record describing this function definition to the prototypes
6953 file (if requested). */
6955 gen_aux_info_record (fndecl, 1, 0, prototype);
6957 /* Initialize the RTL code for the function. */
6959 init_function_start (fndecl, input_filename, lineno);
6961 /* If this is a varargs function, inform function.c. */
6963 if (c_function_varargs)
6966 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6968 declare_function_name ();
6970 /* Set up parameters and prepare for return, for the function. */
6972 expand_function_start (fndecl, 0);
6974 /* If this function is `main', emit a call to `__main'
6975 to run global initializers, etc. */
6976 if (DECL_NAME (fndecl)
6977 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6978 && DECL_CONTEXT (fndecl) == NULL_TREE)
6979 expand_main_function ();
6982 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6983 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6984 stands for an ellipsis in the identifier list.
6986 PARMLIST is the data returned by get_parm_info for the
6987 parmlist that follows the semicolon.
6989 We return a value of the same sort that get_parm_info returns,
6990 except that it describes the combination of identifiers and parmlist. */
6993 combine_parm_decls (specparms, parmlist, void_at_end)
6994 tree specparms, parmlist;
6997 register tree fndecl = current_function_decl;
7000 tree parmdecls = TREE_PURPOSE (parmlist);
7002 /* This is a chain of any other decls that came in among the parm
7003 declarations. They were separated already by get_parm_info,
7004 so we just need to keep them separate. */
7005 tree nonparms = TREE_VALUE (parmlist);
7009 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
7010 DECL_RESULT (parm) = 0;
7012 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
7014 register tree tail, found = NULL;
7016 /* See if any of the parmdecls specifies this parm by name. */
7017 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
7018 if (DECL_NAME (tail) == TREE_VALUE (parm))
7024 /* If declaration already marked, we have a duplicate name.
7025 Complain, and don't use this decl twice. */
7026 if (found && DECL_RESULT (found) != 0)
7028 error_with_decl (found, "multiple parameters named `%s'");
7032 /* If the declaration says "void", complain and ignore it. */
7033 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7035 error_with_decl (found, "parameter `%s' declared void");
7036 TREE_TYPE (found) = integer_type_node;
7037 DECL_ARG_TYPE (found) = integer_type_node;
7038 layout_decl (found, 0);
7041 /* Traditionally, a parm declared float is actually a double. */
7042 if (found && flag_traditional
7043 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7045 TREE_TYPE (found) = double_type_node;
7046 DECL_ARG_TYPE (found) = double_type_node;
7047 layout_decl (found, 0);
7050 /* If no declaration found, default to int. */
7053 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7055 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7056 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7057 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7058 error_with_decl (found, "type of parameter `%s' is not declared");
7062 TREE_PURPOSE (parm) = found;
7064 /* Mark this decl as "already found" -- see test, above.
7065 It is safe to use DECL_RESULT for this
7066 since it is not used in PARM_DECLs or CONST_DECLs. */
7067 DECL_RESULT (found) = error_mark_node;
7070 /* Complain about any actual PARM_DECLs not matched with any names. */
7072 for (parm = parmdecls; parm; )
7074 tree next = TREE_CHAIN (parm);
7075 TREE_CHAIN (parm) = 0;
7077 /* Complain about args with incomplete types. */
7078 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7080 error_with_decl (parm, "parameter `%s' has incomplete type");
7081 TREE_TYPE (parm) = error_mark_node;
7084 if (DECL_RESULT (parm) == 0)
7086 error_with_decl (parm,
7087 "declaration for parameter `%s' but no such parameter");
7088 /* Pretend the parameter was not missing.
7089 This gets us to a standard state and minimizes
7090 further error messages. */
7092 = chainon (specparms,
7093 tree_cons (parm, NULL_TREE, NULL_TREE));
7099 /* Chain the declarations together in the order of the list of names.
7100 At the same time, build up a list of their types, in reverse order. */
7106 for (last = 0; parm; parm = TREE_CHAIN (parm))
7107 if (TREE_PURPOSE (parm))
7110 parmdecls = TREE_PURPOSE (parm);
7112 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7113 last = TREE_PURPOSE (parm);
7114 TREE_CHAIN (last) = 0;
7116 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7121 return saveable_tree_cons (parmdecls, nonparms,
7122 nreverse (saveable_tree_cons (NULL_TREE,
7126 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7129 /* Finish up a function declaration and compile that function
7130 all the way to assembler language output. The free the storage
7131 for the function definition.
7133 This is called after parsing the body of the function definition.
7135 NESTED is nonzero if the function being finished is nested in another. */
7138 finish_function (nested)
7141 register tree fndecl = current_function_decl;
7143 /* TREE_READONLY (fndecl) = 1;
7144 This caused &foo to be of type ptr-to-const-function
7145 which then got a warning when stored in a ptr-to-function variable. */
7148 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7150 /* Must mark the RESULT_DECL as being in this function. */
7152 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7154 /* Obey `register' declarations if `setjmp' is called in this fn. */
7155 if (flag_traditional && current_function_calls_setjmp)
7157 setjmp_protect (DECL_INITIAL (fndecl));
7158 setjmp_protect_args ();
7161 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7163 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7164 != integer_type_node)
7166 /* You would expect the sense of this test to be the other way
7167 around, but if warn_main is set, we will already have warned,
7168 so this would be a duplicate. This is the warning you get
7169 in some environments even if you *don't* ask for it, because
7170 these are environments where it may be more of a problem than
7173 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7177 #ifdef DEFAULT_MAIN_RETURN
7178 /* Make it so that `main' always returns success by default. */
7179 DEFAULT_MAIN_RETURN;
7184 /* Generate rtl for function exit. */
7185 expand_function_end (input_filename, lineno, 0);
7187 /* So we can tell if jump_optimize sets it to 1. */
7190 /* Run the optimizers and output the assembler code for this function. */
7191 rest_of_compilation (fndecl);
7193 current_function_returns_null |= can_reach_end;
7195 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7196 warning ("`noreturn' function does return");
7197 else if (warn_return_type && can_reach_end
7198 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7199 /* If this function returns non-void and control can drop through,
7201 warning ("control reaches end of non-void function");
7202 /* With just -W, complain only if function returns both with
7203 and without a value. */
7204 else if (extra_warnings
7205 && current_function_returns_value && current_function_returns_null)
7206 warning ("this function may return with or without a value");
7208 /* If requested, warn about function definitions where the function will
7209 return a value (usually of some struct or union type) which itself will
7210 take up a lot of stack space. */
7212 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7214 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7218 register tree ret_type_size = TYPE_SIZE (ret_type);
7220 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7223 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7225 if (units > larger_than_size)
7226 warning_with_decl (fndecl,
7227 "size of return value of `%s' is %u bytes",
7233 /* Free all the tree nodes making up this function. */
7234 /* Switch back to allocating nodes permanently
7235 until we start another function. */
7237 permanent_allocation (1);
7239 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7241 /* Stop pointing to the local nodes about to be freed. */
7242 /* But DECL_INITIAL must remain nonzero so we know this
7243 was an actual function definition. */
7244 /* For a nested function, this is done in pop_c_function_context. */
7245 /* If rest_of_compilation set this to 0, leave it 0. */
7246 if (DECL_INITIAL (fndecl) != 0)
7247 DECL_INITIAL (fndecl) = error_mark_node;
7248 DECL_ARGUMENTS (fndecl) = 0;
7251 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7253 #ifndef ASM_OUTPUT_CONSTRUCTOR
7254 if (! flag_gnu_linker)
7255 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7258 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7260 if (DECL_STATIC_DESTRUCTOR (fndecl))
7262 #ifndef ASM_OUTPUT_DESTRUCTOR
7263 if (! flag_gnu_linker)
7264 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7267 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7272 /* Let the error reporting routines know that we're outside a
7273 function. For a nested function, this value is used in
7274 pop_c_function_context and then reset via pop_function_context. */
7275 current_function_decl = NULL;
7279 /* Save and restore the variables in this file and elsewhere
7280 that keep track of the progress of compilation of the current function.
7281 Used for nested functions. */
7285 struct c_function *next;
7287 tree shadowed_labels;
7290 int warn_about_return_type;
7292 struct binding_level *binding_level;
7295 struct c_function *c_function_chain;
7297 /* Save and reinitialize the variables
7298 used during compilation of a C function. */
7301 push_c_function_context ()
7303 struct c_function *p
7304 = (struct c_function *) xmalloc (sizeof (struct c_function));
7307 pedwarn ("ANSI C forbids nested functions");
7309 push_function_context ();
7311 p->next = c_function_chain;
7312 c_function_chain = p;
7314 p->named_labels = named_labels;
7315 p->shadowed_labels = shadowed_labels;
7316 p->returns_value = current_function_returns_value;
7317 p->returns_null = current_function_returns_null;
7318 p->warn_about_return_type = warn_about_return_type;
7319 p->extern_inline = current_extern_inline;
7320 p->binding_level = current_binding_level;
7323 /* Restore the variables used during compilation of a C function. */
7326 pop_c_function_context ()
7328 struct c_function *p = c_function_chain;
7331 /* Bring back all the labels that were shadowed. */
7332 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7333 if (DECL_NAME (TREE_VALUE (link)) != 0)
7334 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7335 = TREE_VALUE (link);
7337 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7339 /* Stop pointing to the local nodes about to be freed. */
7340 /* But DECL_INITIAL must remain nonzero so we know this
7341 was an actual function definition. */
7342 DECL_INITIAL (current_function_decl) = error_mark_node;
7343 DECL_ARGUMENTS (current_function_decl) = 0;
7346 pop_function_context ();
7348 c_function_chain = p->next;
7350 named_labels = p->named_labels;
7351 shadowed_labels = p->shadowed_labels;
7352 current_function_returns_value = p->returns_value;
7353 current_function_returns_null = p->returns_null;
7354 warn_about_return_type = p->warn_about_return_type;
7355 current_extern_inline = p->extern_inline;
7356 current_binding_level = p->binding_level;
7361 /* integrate_decl_tree calls this function, but since we don't use the
7362 DECL_LANG_SPECIFIC field, this is a no-op. */
7365 copy_lang_decl (node)
7366 tree node ATTRIBUTE_UNUSED;