1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-98, 1999 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;
43 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
45 { NORMAL, /* Ordinary declaration */
46 FUNCDEF, /* Function definition */
47 PARM, /* Declaration of parm before function body */
48 FIELD, /* Declaration inside struct or union */
49 BITFIELD, /* Likewise but with specified width */
50 TYPENAME}; /* Typename (inside cast or sizeof) */
52 #ifndef CHAR_TYPE_SIZE
53 #define CHAR_TYPE_SIZE BITS_PER_UNIT
56 #ifndef SHORT_TYPE_SIZE
57 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
61 #define INT_TYPE_SIZE BITS_PER_WORD
64 #ifndef LONG_TYPE_SIZE
65 #define LONG_TYPE_SIZE BITS_PER_WORD
68 #ifndef LONG_LONG_TYPE_SIZE
69 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
72 #ifndef WCHAR_UNSIGNED
73 #define WCHAR_UNSIGNED 0
76 #ifndef FLOAT_TYPE_SIZE
77 #define FLOAT_TYPE_SIZE BITS_PER_WORD
80 #ifndef DOUBLE_TYPE_SIZE
81 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
84 #ifndef LONG_DOUBLE_TYPE_SIZE
85 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
88 /* We let tm.h override the types used here, to handle trivial differences
89 such as the choice of unsigned int or long unsigned int for size_t.
90 When machines start needing nontrivial differences in the size type,
91 it would be best to do something here to figure out automatically
92 from other information what type to use. */
95 #define SIZE_TYPE "long unsigned int"
99 #define PTRDIFF_TYPE "long int"
103 #define WCHAR_TYPE "int"
106 /* a node which has tree code ERROR_MARK, and whose type is itself.
107 All erroneous expressions are replaced with this node. All functions
108 that accept nodes as arguments should avoid generating error messages
109 if this node is one of the arguments, since it is undesirable to get
110 multiple error messages from one error in the input. */
112 tree error_mark_node;
114 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
116 tree short_integer_type_node;
117 tree integer_type_node;
118 tree long_integer_type_node;
119 tree long_long_integer_type_node;
121 tree short_unsigned_type_node;
122 tree unsigned_type_node;
123 tree long_unsigned_type_node;
124 tree long_long_unsigned_type_node;
126 /* These are used for integer literals that are larger than
127 a long long. The largest integer literals we can handle
128 are the width of two HOST_WIDE_INTs. If two HOST_WIDE_INTs
129 are not larger than the target's long long, then these
130 will never be used. */
131 tree widest_integer_literal_type_node;
132 tree widest_unsigned_literal_type_node;
134 tree boolean_type_node;
135 tree boolean_false_node;
136 tree boolean_true_node;
138 tree ptrdiff_type_node;
140 tree unsigned_char_type_node;
141 tree signed_char_type_node;
143 tree wchar_type_node;
144 tree signed_wchar_type_node;
145 tree unsigned_wchar_type_node;
147 tree float_type_node;
148 tree double_type_node;
149 tree long_double_type_node;
151 tree complex_integer_type_node;
152 tree complex_float_type_node;
153 tree complex_double_type_node;
154 tree complex_long_double_type_node;
156 tree intQI_type_node;
157 tree intHI_type_node;
158 tree intSI_type_node;
159 tree intDI_type_node;
160 #if HOST_BITS_PER_WIDE_INT >= 64
161 tree intTI_type_node;
164 tree unsigned_intQI_type_node;
165 tree unsigned_intHI_type_node;
166 tree unsigned_intSI_type_node;
167 tree unsigned_intDI_type_node;
168 #if HOST_BITS_PER_WIDE_INT >= 64
169 tree unsigned_intTI_type_node;
172 /* a VOID_TYPE node. */
176 /* Nodes for types `void *' and `const void *'. */
178 tree ptr_type_node, const_ptr_type_node;
180 /* Nodes for types `char *' and `const char *'. */
182 tree string_type_node, const_string_type_node;
184 /* Type `char[SOMENUMBER]'.
185 Used when an array of char is needed and the size is irrelevant. */
187 tree char_array_type_node;
189 /* Type `int[SOMENUMBER]' or something like it.
190 Used when an array of int needed and the size is irrelevant. */
192 tree int_array_type_node;
194 /* Type `wchar_t[SOMENUMBER]' or something like it.
195 Used when a wide string literal is created. */
197 tree wchar_array_type_node;
199 /* type `int ()' -- used for implicit declaration of functions. */
201 tree default_function_type;
203 /* function types `double (double)' and `double (double, double)', etc. */
205 tree double_ftype_double, double_ftype_double_double;
206 tree int_ftype_int, long_ftype_long;
207 tree float_ftype_float;
208 tree ldouble_ftype_ldouble;
210 /* Function type `void (void *, void *, int)' and similar ones */
212 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
214 /* Function type `char *(char *, char *)' and similar ones */
215 tree string_ftype_ptr_ptr, int_ftype_string_string;
217 /* Function type `int (const void *, const void *, size_t)' */
218 tree int_ftype_cptr_cptr_sizet;
220 /* Two expressions that are constants with value zero.
221 The first is of type `int', the second of type `void *'. */
223 tree integer_zero_node;
224 tree null_pointer_node;
226 /* A node for the integer constant 1. */
228 tree integer_one_node;
230 /* Nonzero if we have seen an invalid cross reference
231 to a struct, union, or enum, but not yet printed the message. */
233 tree pending_invalid_xref;
234 /* File and line to appear in the eventual error message. */
235 char *pending_invalid_xref_file;
236 int pending_invalid_xref_line;
238 /* While defining an enum type, this is 1 plus the last enumerator
239 constant value. Note that will do not have to save this or `enum_overflow'
240 around nested function definition since such a definition could only
241 occur in an enum value expression and we don't use these variables in
244 static tree enum_next_value;
246 /* Nonzero means that there was overflow computing enum_next_value. */
248 static int enum_overflow;
250 /* Parsing a function declarator leaves a list of parameter names
251 or a chain or parameter decls here. */
253 static tree last_function_parms;
255 /* Parsing a function declarator leaves here a chain of structure
256 and enum types declared in the parmlist. */
258 static tree last_function_parm_tags;
260 /* After parsing the declarator that starts a function definition,
261 `start_function' puts here the list of parameter names or chain of decls.
262 `store_parm_decls' finds it here. */
264 static tree current_function_parms;
266 /* Similar, for last_function_parm_tags. */
267 static tree current_function_parm_tags;
269 /* Similar, for the file and line that the prototype came from if this is
270 an old-style definition. */
271 static char *current_function_prototype_file;
272 static int current_function_prototype_line;
274 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
275 that have names. Here so we can clear out their names' definitions
276 at the end of the function. */
278 static tree named_labels;
280 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
282 static tree shadowed_labels;
284 /* Nonzero when store_parm_decls is called indicates a varargs function.
285 Value not meaningful after store_parm_decls. */
287 static int c_function_varargs;
289 /* The FUNCTION_DECL for the function currently being compiled,
290 or 0 if between functions. */
291 tree current_function_decl;
293 /* Set to 0 at beginning of a function definition, set to 1 if
294 a return statement that specifies a return value is seen. */
296 int current_function_returns_value;
298 /* Set to 0 at beginning of a function definition, set to 1 if
299 a return statement with no argument is seen. */
301 int current_function_returns_null;
303 /* Set to nonzero by `grokdeclarator' for a function
304 whose return type is defaulted, if warnings for this are desired. */
306 static int warn_about_return_type;
308 /* Nonzero when starting a function declared `extern inline'. */
310 static int current_extern_inline;
312 /* For each binding contour we allocate a binding_level structure
313 * which records the names defined in that contour.
316 * 1) one for each function definition,
317 * where internal declarations of the parameters appear.
318 * 2) one for each compound statement,
319 * to record its declarations.
321 * The current meaning of a name can be found by searching the levels from
322 * the current one out to the global one.
325 /* Note that the information in the `names' component of the global contour
326 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
330 /* A chain of _DECL nodes for all variables, constants, functions,
331 and typedef types. These are in the reverse of the order supplied.
335 /* A list of structure, union and enum definitions,
336 * for looking up tag names.
337 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
338 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
339 * or ENUMERAL_TYPE node.
343 /* For each level, a list of shadowed outer-level local definitions
344 to be restored when this level is popped.
345 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
346 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
349 /* For each level (except not the global one),
350 a chain of BLOCK nodes for all the levels
351 that were entered and exited one level down. */
354 /* The BLOCK node for this level, if one has been preallocated.
355 If 0, the BLOCK is allocated (if needed) when the level is popped. */
358 /* The binding level which this one is contained in (inherits from). */
359 struct binding_level *level_chain;
361 /* Nonzero for the level that holds the parameters of a function. */
364 /* Nonzero if this level "doesn't exist" for tags. */
365 char tag_transparent;
367 /* Nonzero if sublevels of this level "don't exist" for tags.
368 This is set in the parm level of a function definition
369 while reading the function body, so that the outermost block
370 of the function body will be tag-transparent. */
371 char subblocks_tag_transparent;
373 /* Nonzero means make a BLOCK for this level regardless of all else. */
376 /* Nonzero means make a BLOCK if this level has any subblocks. */
377 char keep_if_subblocks;
379 /* Number of decls in `names' that have incomplete
380 structure or union types. */
383 /* A list of decls giving the (reversed) specified order of parms,
384 not including any forward-decls in the parmlist.
385 This is so we can put the parms in proper order for assign_parms. */
389 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
391 /* The binding level currently in effect. */
393 static struct binding_level *current_binding_level;
395 /* A chain of binding_level structures awaiting reuse. */
397 static struct binding_level *free_binding_level;
399 /* The outermost binding level, for names of file scope.
400 This is created when the compiler is started and exists
401 through the entire run. */
403 static struct binding_level *global_binding_level;
405 /* Binding level structures are initialized by copying this one. */
407 static struct binding_level clear_binding_level
408 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
411 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
413 static int keep_next_level_flag;
415 /* Nonzero means make a BLOCK for the next level pushed
416 if it has subblocks. */
418 static int keep_next_if_subblocks;
420 /* The chain of outer levels of label scopes.
421 This uses the same data structure used for binding levels,
422 but it works differently: each link in the chain records
423 saved values of named_labels and shadowed_labels for
424 a label binding level outside the current one. */
426 static struct binding_level *label_level_chain;
428 /* Functions called automatically at the beginning and end of execution. */
430 tree static_ctors, static_dtors;
432 /* Forward declarations. */
434 static struct binding_level * make_binding_level PROTO((void));
435 static void clear_limbo_values PROTO((tree));
436 static int duplicate_decls PROTO((tree, tree, int));
437 static int redeclaration_error_message PROTO((tree, tree));
438 static void storedecls PROTO((tree));
439 static void storetags PROTO((tree));
440 static tree lookup_tag PROTO((enum tree_code, tree,
441 struct binding_level *, int));
442 static tree lookup_tag_reverse PROTO((tree));
443 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
445 static tree grokparms PROTO((tree, int));
446 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
447 static void layout_array_type PROTO((tree));
449 /* C-specific option variables. */
451 /* Nonzero means allow type mismatches in conditional expressions;
452 just make their values `void'. */
454 int flag_cond_mismatch;
456 /* Nonzero means give `double' the same size as `float'. */
458 int flag_short_double;
460 /* Nonzero means don't recognize the keyword `asm'. */
464 /* Nonzero means don't recognize any builtin functions. */
468 /* Nonzero means don't recognize the non-ANSI builtin functions.
471 int flag_no_nonansi_builtin;
473 /* Nonzero means do some things the same way PCC does. */
475 int flag_traditional;
477 /* Nonzero means use the ISO C9x dialect of C. */
481 /* Nonzero means that we have builtin functions, and main is an int */
485 /* Nonzero means to allow single precision math even if we're generally
486 being traditional. */
487 int flag_allow_single_precision = 0;
489 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
491 int flag_signed_bitfields = 1;
492 int explicit_flag_signed_bitfields = 0;
494 /* Nonzero means warn about use of implicit int. */
496 int warn_implicit_int;
498 /* Nonzero means warn about usage of long long when `-pedantic'. */
500 int warn_long_long = 1;
502 /* Nonzero means message about use of implicit function declarations;
503 1 means warning; 2 means error. */
505 int mesg_implicit_function_declaration;
507 /* Nonzero means give string constants the type `const char *'
508 to get extra warnings from them. These warnings will be too numerous
509 to be useful, except in thoroughly ANSIfied programs. */
511 int flag_const_strings;
513 /* Nonzero means warn about pointer casts that can drop a type qualifier
514 from the pointer target type. */
518 /* Nonzero means warn when casting a function call to a type that does
519 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
520 when there is no previous declaration of sqrt or malloc. */
522 int warn_bad_function_cast;
524 /* Warn about functions which might be candidates for attribute noreturn. */
526 int warn_missing_noreturn;
528 /* Warn about traditional constructs whose meanings changed in ANSI C. */
530 int warn_traditional;
532 /* Nonzero means warn about sizeof(function) or addition/subtraction
533 of function pointers. */
535 int warn_pointer_arith;
537 /* Nonzero means warn for non-prototype function decls
538 or non-prototyped defs without previous prototype. */
540 int warn_strict_prototypes;
542 /* Nonzero means warn for any global function def
543 without separate previous prototype decl. */
545 int warn_missing_prototypes;
547 /* Nonzero means warn for any global function def
548 without separate previous decl. */
550 int warn_missing_declarations;
552 /* Nonzero means warn about multiple (redundant) decls for the same single
553 variable or function. */
555 int warn_redundant_decls = 0;
557 /* Nonzero means warn about extern declarations of objects not at
558 file-scope level and about *all* declarations of functions (whether
559 extern or static) not at file-scope level. Note that we exclude
560 implicit function declarations. To get warnings about those, use
563 int warn_nested_externs = 0;
565 /* Warn about *printf or *scanf format/argument anomalies. */
569 /* Warn about a subscript that has type char. */
571 int warn_char_subscripts = 0;
573 /* Warn if a type conversion is done that might have confusing results. */
577 /* Warn if adding () is suggested. */
579 int warn_parentheses;
581 /* Warn if initializer is not completely bracketed. */
583 int warn_missing_braces;
585 /* Warn if main is suspicious. */
589 /* Warn about #pragma directives that are not recognised. */
591 int warn_unknown_pragmas = 0; /* Tri state variable. */
593 /* Warn about comparison of signed and unsigned values.
594 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
596 int warn_sign_compare = -1;
598 /* Nonzero means warn about use of multicharacter literals. */
600 int warn_multichar = 1;
602 /* Nonzero means `$' can be in an identifier. */
604 #ifndef DOLLARS_IN_IDENTIFIERS
605 #define DOLLARS_IN_IDENTIFIERS 1
607 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
609 /* Decode the string P as a language-specific option for C.
610 Return the number of strings consumed. */
613 c_decode_option (argc, argv)
614 int argc ATTRIBUTE_UNUSED;
617 int strings_processed;
620 strings_processed = cpp_handle_option (&parse_in, argc, argv);
622 strings_processed = 0;
623 #endif /* ! USE_CPPLIB */
625 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
627 flag_traditional = 1;
628 flag_writable_strings = 1;
630 else if (!strcmp (p, "-fallow-single-precision"))
631 flag_allow_single_precision = 1;
632 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
637 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
641 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
645 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
647 flag_traditional = 0;
648 flag_writable_strings = 0;
650 else if (!strncmp (p, "-std=", 5))
652 /* Select the appropriate language standard. We currently
654 -std=iso9899:1990 same as -ansi
655 -std=iso9899:199409 ISO C as modified in amend. 1
656 -std=iso9899:199x ISO C 9x
657 -std=c89 same as -std=iso9899:1990
658 -std=c9x same as -std=iso9899:199x
659 -std=gnu89 default, iso9899:1990 + gnu extensions
660 -std=gnu9x iso9899:199x + gnu extensions
662 const char *argstart = &p[5];
664 if (!strcmp (argstart, "iso9899:1990")
665 || !strcmp (argstart, "c89"))
668 flag_traditional = 0;
669 flag_writable_strings = 0;
671 flag_no_nonansi_builtin = 1;
674 else if (!strcmp (argstart, "iso9899:199409"))
676 /* ??? The changes since ISO C 1990 are not supported. */
679 else if (!strcmp (argstart, "iso9899:199x")
680 || !strcmp (argstart, "c9x"))
682 flag_traditional = 0;
683 flag_writable_strings = 0;
685 flag_no_nonansi_builtin = 1;
688 else if (!strcmp (argstart, "gnu89"))
690 flag_traditional = 0;
691 flag_writable_strings = 0;
693 flag_no_nonansi_builtin = 0;
696 else if (!strcmp (argstart, "gnu9x"))
698 flag_traditional = 0;
699 flag_writable_strings = 0;
701 flag_no_nonansi_builtin = 0;
705 error ("unknown C standard `%s'", argstart);
707 else if (!strcmp (p, "-fdollars-in-identifiers"))
708 dollars_in_ident = 1;
709 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
710 dollars_in_ident = 0;
711 else if (!strcmp (p, "-fsigned-char"))
712 flag_signed_char = 1;
713 else if (!strcmp (p, "-funsigned-char"))
714 flag_signed_char = 0;
715 else if (!strcmp (p, "-fno-signed-char"))
716 flag_signed_char = 0;
717 else if (!strcmp (p, "-fno-unsigned-char"))
718 flag_signed_char = 1;
719 else if (!strcmp (p, "-fsigned-bitfields")
720 || !strcmp (p, "-fno-unsigned-bitfields"))
722 flag_signed_bitfields = 1;
723 explicit_flag_signed_bitfields = 1;
725 else if (!strcmp (p, "-funsigned-bitfields")
726 || !strcmp (p, "-fno-signed-bitfields"))
728 flag_signed_bitfields = 0;
729 explicit_flag_signed_bitfields = 1;
731 else if (!strcmp (p, "-fshort-enums"))
732 flag_short_enums = 1;
733 else if (!strcmp (p, "-fno-short-enums"))
734 flag_short_enums = 0;
735 else if (!strcmp (p, "-fcond-mismatch"))
736 flag_cond_mismatch = 1;
737 else if (!strcmp (p, "-fno-cond-mismatch"))
738 flag_cond_mismatch = 0;
739 else if (!strcmp (p, "-fshort-double"))
740 flag_short_double = 1;
741 else if (!strcmp (p, "-fno-short-double"))
742 flag_short_double = 0;
743 else if (!strcmp (p, "-fasm"))
745 else if (!strcmp (p, "-fno-asm"))
747 else if (!strcmp (p, "-fbuiltin"))
749 else if (!strcmp (p, "-fno-builtin"))
751 else if (!strcmp (p, "-ansi"))
753 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
754 mesg_implicit_function_declaration = 2;
755 else if (!strcmp (p, "-Wimplicit-function-declaration"))
756 mesg_implicit_function_declaration = 1;
757 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
758 mesg_implicit_function_declaration = 0;
759 else if (!strcmp (p, "-Wimplicit-int"))
760 warn_implicit_int = 1;
761 else if (!strcmp (p, "-Wno-implicit-int"))
762 warn_implicit_int = 0;
763 else if (!strcmp (p, "-Wimplicit"))
765 warn_implicit_int = 1;
766 if (mesg_implicit_function_declaration != 2)
767 mesg_implicit_function_declaration = 1;
769 else if (!strcmp (p, "-Wno-implicit"))
770 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
771 else if (!strcmp (p, "-Wlong-long"))
773 else if (!strcmp (p, "-Wno-long-long"))
775 else if (!strcmp (p, "-Wwrite-strings"))
776 flag_const_strings = 1;
777 else if (!strcmp (p, "-Wno-write-strings"))
778 flag_const_strings = 0;
779 else if (!strcmp (p, "-Wcast-qual"))
781 else if (!strcmp (p, "-Wno-cast-qual"))
783 else if (!strcmp (p, "-Wbad-function-cast"))
784 warn_bad_function_cast = 1;
785 else if (!strcmp (p, "-Wno-bad-function-cast"))
786 warn_bad_function_cast = 0;
787 else if (!strcmp (p, "-Wmissing-noreturn"))
788 warn_missing_noreturn = 1;
789 else if (!strcmp (p, "-Wno-missing-noreturn"))
790 warn_missing_noreturn = 0;
791 else if (!strcmp (p, "-Wpointer-arith"))
792 warn_pointer_arith = 1;
793 else if (!strcmp (p, "-Wno-pointer-arith"))
794 warn_pointer_arith = 0;
795 else if (!strcmp (p, "-Wstrict-prototypes"))
796 warn_strict_prototypes = 1;
797 else if (!strcmp (p, "-Wno-strict-prototypes"))
798 warn_strict_prototypes = 0;
799 else if (!strcmp (p, "-Wmissing-prototypes"))
800 warn_missing_prototypes = 1;
801 else if (!strcmp (p, "-Wno-missing-prototypes"))
802 warn_missing_prototypes = 0;
803 else if (!strcmp (p, "-Wmissing-declarations"))
804 warn_missing_declarations = 1;
805 else if (!strcmp (p, "-Wno-missing-declarations"))
806 warn_missing_declarations = 0;
807 else if (!strcmp (p, "-Wredundant-decls"))
808 warn_redundant_decls = 1;
809 else if (!strcmp (p, "-Wno-redundant-decls"))
810 warn_redundant_decls = 0;
811 else if (!strcmp (p, "-Wnested-externs"))
812 warn_nested_externs = 1;
813 else if (!strcmp (p, "-Wno-nested-externs"))
814 warn_nested_externs = 0;
815 else if (!strcmp (p, "-Wtraditional"))
816 warn_traditional = 1;
817 else if (!strcmp (p, "-Wno-traditional"))
818 warn_traditional = 0;
819 else if (!strcmp (p, "-Wformat"))
821 else if (!strcmp (p, "-Wno-format"))
823 else if (!strcmp (p, "-Wchar-subscripts"))
824 warn_char_subscripts = 1;
825 else if (!strcmp (p, "-Wno-char-subscripts"))
826 warn_char_subscripts = 0;
827 else if (!strcmp (p, "-Wconversion"))
829 else if (!strcmp (p, "-Wno-conversion"))
831 else if (!strcmp (p, "-Wparentheses"))
832 warn_parentheses = 1;
833 else if (!strcmp (p, "-Wno-parentheses"))
834 warn_parentheses = 0;
835 else if (!strcmp (p, "-Wreturn-type"))
836 warn_return_type = 1;
837 else if (!strcmp (p, "-Wno-return-type"))
838 warn_return_type = 0;
839 else if (!strcmp (p, "-Wcomment"))
840 ; /* cpp handles this one. */
841 else if (!strcmp (p, "-Wno-comment"))
842 ; /* cpp handles this one. */
843 else if (!strcmp (p, "-Wcomments"))
844 ; /* cpp handles this one. */
845 else if (!strcmp (p, "-Wno-comments"))
846 ; /* cpp handles this one. */
847 else if (!strcmp (p, "-Wtrigraphs"))
848 ; /* cpp handles this one. */
849 else if (!strcmp (p, "-Wno-trigraphs"))
850 ; /* cpp handles this one. */
851 else if (!strcmp (p, "-Wundef"))
852 ; /* cpp handles this one. */
853 else if (!strcmp (p, "-Wno-undef"))
854 ; /* cpp handles this one. */
855 else if (!strcmp (p, "-Wimport"))
856 ; /* cpp handles this one. */
857 else if (!strcmp (p, "-Wno-import"))
858 ; /* cpp handles this one. */
859 else if (!strcmp (p, "-Wmissing-braces"))
860 warn_missing_braces = 1;
861 else if (!strcmp (p, "-Wno-missing-braces"))
862 warn_missing_braces = 0;
863 else if (!strcmp (p, "-Wmain"))
865 else if (!strcmp (p, "-Wno-main"))
867 else if (!strcmp (p, "-Wsign-compare"))
868 warn_sign_compare = 1;
869 else if (!strcmp (p, "-Wno-sign-compare"))
870 warn_sign_compare = 0;
871 else if (!strcmp (p, "-Wmultichar"))
873 else if (!strcmp (p, "-Wno-multichar"))
875 else if (!strcmp (p, "-Wunknown-pragmas"))
876 /* Set to greater than 1, so that even unknown pragmas in system
877 headers will be warned about. */
878 warn_unknown_pragmas = 2;
879 else if (!strcmp (p, "-Wno-unknown-pragmas"))
880 warn_unknown_pragmas = 0;
881 else if (!strcmp (p, "-Wall"))
883 /* We save the value of warn_uninitialized, since if they put
884 -Wuninitialized on the command line, we need to generate a
885 warning about not using it without also specifying -O. */
886 if (warn_uninitialized != 1)
887 warn_uninitialized = 2;
888 warn_implicit_int = 1;
889 mesg_implicit_function_declaration = 1;
890 warn_return_type = 1;
894 warn_char_subscripts = 1;
895 warn_parentheses = 1;
896 warn_missing_braces = 1;
897 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
898 it off only if it's not explicit. */
900 /* Only warn about unknown pragmas that are not in system headers. */
901 warn_unknown_pragmas = 1;
904 return strings_processed;
909 /* Hooks for print_node. */
912 print_lang_decl (file, node, indent)
913 FILE *file ATTRIBUTE_UNUSED;
914 tree node ATTRIBUTE_UNUSED;
915 int indent ATTRIBUTE_UNUSED;
920 print_lang_type (file, node, indent)
921 FILE *file ATTRIBUTE_UNUSED;
922 tree node ATTRIBUTE_UNUSED;
923 int indent ATTRIBUTE_UNUSED;
928 print_lang_identifier (file, node, indent)
933 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
934 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
935 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
936 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
937 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
938 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
941 /* Hook called at end of compilation to assume 1 elt
942 for a top-level array decl that wasn't complete before. */
945 finish_incomplete_decl (decl)
948 if (TREE_CODE (decl) == VAR_DECL)
950 tree type = TREE_TYPE (decl);
951 if (type != error_mark_node
952 && TREE_CODE (type) == ARRAY_TYPE
953 && TYPE_DOMAIN (type) == 0)
955 if (! DECL_EXTERNAL (decl))
956 warning_with_decl (decl, "array `%s' assumed to have one element");
958 complete_array_type (type, NULL_TREE, 1);
960 layout_decl (decl, 0);
965 /* Create a new `struct binding_level'. */
968 struct binding_level *
969 make_binding_level ()
972 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
975 /* Nonzero if we are currently in the global binding level. */
980 return current_binding_level == global_binding_level;
986 keep_next_level_flag = 1;
989 /* Nonzero if the current level needs to have a BLOCK made. */
994 return ((current_binding_level->keep_if_subblocks
995 && current_binding_level->blocks != 0)
996 || current_binding_level->keep
997 || current_binding_level->names != 0
998 || (current_binding_level->tags != 0
999 && !current_binding_level->tag_transparent));
1002 /* Identify this binding level as a level of parameters.
1003 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
1004 But it turns out there is no way to pass the right value for
1005 DEFINITION_FLAG, so we ignore it. */
1008 declare_parm_level (definition_flag)
1009 int definition_flag ATTRIBUTE_UNUSED;
1011 current_binding_level->parm_flag = 1;
1014 /* Nonzero if currently making parm declarations. */
1019 return current_binding_level->parm_flag;
1022 /* Enter a new binding level.
1023 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
1024 not for that of tags. */
1027 pushlevel (tag_transparent)
1028 int tag_transparent;
1030 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
1032 /* If this is the top level of a function,
1033 just make sure that NAMED_LABELS is 0. */
1035 if (current_binding_level == global_binding_level)
1040 /* Reuse or create a struct for this binding level. */
1042 if (free_binding_level)
1044 newlevel = free_binding_level;
1045 free_binding_level = free_binding_level->level_chain;
1049 newlevel = make_binding_level ();
1052 /* Add this level to the front of the chain (stack) of levels that
1055 *newlevel = clear_binding_level;
1056 newlevel->tag_transparent
1058 || (current_binding_level
1059 ? current_binding_level->subblocks_tag_transparent
1061 newlevel->level_chain = current_binding_level;
1062 current_binding_level = newlevel;
1063 newlevel->keep = keep_next_level_flag;
1064 keep_next_level_flag = 0;
1065 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1066 keep_next_if_subblocks = 0;
1069 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1072 clear_limbo_values (block)
1077 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1078 if (DECL_NAME (tem) != 0)
1079 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1081 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1082 clear_limbo_values (tem);
1085 /* Exit a binding level.
1086 Pop the level off, and restore the state of the identifier-decl mappings
1087 that were in effect when this level was entered.
1089 If KEEP is nonzero, this level had explicit declarations, so
1090 and create a "block" (a BLOCK node) for the level
1091 to record its declarations and subblocks for symbol table output.
1093 If FUNCTIONBODY is nonzero, this level is the body of a function,
1094 so create a block as if KEEP were set and also clear out all
1097 If REVERSE is nonzero, reverse the order of decls before putting
1098 them into the BLOCK. */
1101 poplevel (keep, reverse, functionbody)
1107 /* The chain of decls was accumulated in reverse order.
1108 Put it into forward order, just for cleanliness. */
1110 tree tags = current_binding_level->tags;
1111 tree subblocks = current_binding_level->blocks;
1114 int block_previously_created;
1116 keep |= current_binding_level->keep;
1118 /* This warning is turned off because it causes warnings for
1119 declarations like `extern struct foo *x'. */
1121 /* Warn about incomplete structure types in this level. */
1122 for (link = tags; link; link = TREE_CHAIN (link))
1123 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1125 tree type = TREE_VALUE (link);
1126 tree type_name = TYPE_NAME (type);
1127 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1129 : DECL_NAME (type_name));
1130 switch (TREE_CODE (type))
1133 error ("`struct %s' incomplete in scope ending here", id);
1136 error ("`union %s' incomplete in scope ending here", id);
1139 error ("`enum %s' incomplete in scope ending here", id);
1145 /* Get the decls in the order they were written.
1146 Usually current_binding_level->names is in reverse order.
1147 But parameter decls were previously put in forward order. */
1150 current_binding_level->names
1151 = decls = nreverse (current_binding_level->names);
1153 decls = current_binding_level->names;
1155 /* Output any nested inline functions within this block
1156 if they weren't already output. */
1158 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1159 if (TREE_CODE (decl) == FUNCTION_DECL
1160 && ! TREE_ASM_WRITTEN (decl)
1161 && DECL_INITIAL (decl) != 0
1162 && TREE_ADDRESSABLE (decl))
1164 /* If this decl was copied from a file-scope decl
1165 on account of a block-scope extern decl,
1166 propagate TREE_ADDRESSABLE to the file-scope decl.
1168 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1169 true, since then the decl goes through save_for_inline_copying. */
1170 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1171 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1172 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1173 else if (DECL_SAVED_INSNS (decl) != 0)
1175 push_function_context ();
1176 output_inline_function (decl);
1177 pop_function_context ();
1181 /* If there were any declarations or structure tags in that level,
1182 or if this level is a function body,
1183 create a BLOCK to record them for the life of this function. */
1186 block_previously_created = (current_binding_level->this_block != 0);
1187 if (block_previously_created)
1188 block = current_binding_level->this_block;
1189 else if (keep || functionbody
1190 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1191 block = make_node (BLOCK);
1194 BLOCK_VARS (block) = decls;
1195 BLOCK_TYPE_TAGS (block) = tags;
1196 BLOCK_SUBBLOCKS (block) = subblocks;
1197 remember_end_note (block);
1200 /* In each subblock, record that this is its superior. */
1202 for (link = subblocks; link; link = TREE_CHAIN (link))
1203 BLOCK_SUPERCONTEXT (link) = block;
1205 /* Clear out the meanings of the local variables of this level. */
1207 for (link = decls; link; link = TREE_CHAIN (link))
1209 if (DECL_NAME (link) != 0)
1211 /* If the ident. was used or addressed via a local extern decl,
1212 don't forget that fact. */
1213 if (DECL_EXTERNAL (link))
1215 if (TREE_USED (link))
1216 TREE_USED (DECL_NAME (link)) = 1;
1217 if (TREE_ADDRESSABLE (link))
1218 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1220 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1224 /* Restore all name-meanings of the outer levels
1225 that were shadowed by this level. */
1227 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1228 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1230 /* If the level being exited is the top level of a function,
1231 check over all the labels, and clear out the current
1232 (function local) meanings of their names. */
1236 clear_limbo_values (block);
1238 /* If this is the top level block of a function,
1239 the vars are the function's parameters.
1240 Don't leave them in the BLOCK because they are
1241 found in the FUNCTION_DECL instead. */
1243 BLOCK_VARS (block) = 0;
1245 /* Clear out the definitions of all label names,
1246 since their scopes end here,
1247 and add them to BLOCK_VARS. */
1249 for (link = named_labels; link; link = TREE_CHAIN (link))
1251 register tree label = TREE_VALUE (link);
1253 if (DECL_INITIAL (label) == 0)
1255 error_with_decl (label, "label `%s' used but not defined");
1256 /* Avoid crashing later. */
1257 define_label (input_filename, lineno,
1260 else if (warn_unused && !TREE_USED (label))
1261 warning_with_decl (label, "label `%s' defined but not used");
1262 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1264 /* Put the labels into the "variables" of the
1265 top-level block, so debugger can see them. */
1266 TREE_CHAIN (label) = BLOCK_VARS (block);
1267 BLOCK_VARS (block) = label;
1271 /* Pop the current level, and free the structure for reuse. */
1274 register struct binding_level *level = current_binding_level;
1275 current_binding_level = current_binding_level->level_chain;
1277 level->level_chain = free_binding_level;
1278 free_binding_level = level;
1281 /* Dispose of the block that we just made inside some higher level. */
1283 DECL_INITIAL (current_function_decl) = block;
1286 if (!block_previously_created)
1287 current_binding_level->blocks
1288 = chainon (current_binding_level->blocks, block);
1290 /* If we did not make a block for the level just exited,
1291 any blocks made for inner levels
1292 (since they cannot be recorded as subblocks in that level)
1293 must be carried forward so they will later become subblocks
1294 of something else. */
1296 current_binding_level->blocks
1297 = chainon (current_binding_level->blocks, subblocks);
1299 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1300 binding contour so that they point to the appropriate construct, i.e.
1301 either to the current FUNCTION_DECL node, or else to the BLOCK node
1302 we just constructed.
1304 Note that for tagged types whose scope is just the formal parameter
1305 list for some function type specification, we can't properly set
1306 their TYPE_CONTEXTs here, because we don't have a pointer to the
1307 appropriate FUNCTION_TYPE node readily available to us. For those
1308 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1309 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1310 node which will represent the "scope" for these "parameter list local"
1315 for (link = tags; link; link = TREE_CHAIN (link))
1316 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1318 for (link = tags; link; link = TREE_CHAIN (link))
1319 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1322 TREE_USED (block) = 1;
1326 /* Delete the node BLOCK from the current binding level.
1327 This is used for the block inside a stmt expr ({...})
1328 so that the block can be reinserted where appropriate. */
1331 delete_block (block)
1335 if (current_binding_level->blocks == block)
1336 current_binding_level->blocks = TREE_CHAIN (block);
1337 for (t = current_binding_level->blocks; t;)
1339 if (TREE_CHAIN (t) == block)
1340 TREE_CHAIN (t) = TREE_CHAIN (block);
1344 TREE_CHAIN (block) = NULL;
1345 /* Clear TREE_USED which is always set by poplevel.
1346 The flag is set again if insert_block is called. */
1347 TREE_USED (block) = 0;
1350 /* Insert BLOCK at the end of the list of subblocks of the
1351 current binding level. This is used when a BIND_EXPR is expanded,
1352 to handle the BLOCK node inside the BIND_EXPR. */
1355 insert_block (block)
1358 TREE_USED (block) = 1;
1359 current_binding_level->blocks
1360 = chainon (current_binding_level->blocks, block);
1363 /* Set the BLOCK node for the innermost scope
1364 (the one we are currently in). */
1368 register tree block;
1370 current_binding_level->this_block = block;
1376 register struct binding_level *newlevel;
1378 /* Reuse or create a struct for this binding level. */
1380 if (free_binding_level)
1382 newlevel = free_binding_level;
1383 free_binding_level = free_binding_level->level_chain;
1387 newlevel = make_binding_level ();
1390 /* Add this level to the front of the chain (stack) of label levels. */
1392 newlevel->level_chain = label_level_chain;
1393 label_level_chain = newlevel;
1395 newlevel->names = named_labels;
1396 newlevel->shadowed = shadowed_labels;
1398 shadowed_labels = 0;
1404 register struct binding_level *level = label_level_chain;
1407 /* Clear out the definitions of the declared labels in this level.
1408 Leave in the list any ordinary, non-declared labels. */
1409 for (link = named_labels, prev = 0; link;)
1411 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1413 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1415 error_with_decl (TREE_VALUE (link),
1416 "label `%s' used but not defined");
1417 /* Avoid crashing later. */
1418 define_label (input_filename, lineno,
1419 DECL_NAME (TREE_VALUE (link)));
1421 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1422 warning_with_decl (TREE_VALUE (link),
1423 "label `%s' defined but not used");
1424 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1426 /* Delete this element from the list. */
1427 link = TREE_CHAIN (link);
1429 TREE_CHAIN (prev) = link;
1431 named_labels = link;
1436 link = TREE_CHAIN (link);
1440 /* Bring back all the labels that were shadowed. */
1441 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1442 if (DECL_NAME (TREE_VALUE (link)) != 0)
1443 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1444 = TREE_VALUE (link);
1446 named_labels = chainon (named_labels, level->names);
1447 shadowed_labels = level->shadowed;
1449 /* Pop the current level, and free the structure for reuse. */
1450 label_level_chain = label_level_chain->level_chain;
1451 level->level_chain = free_binding_level;
1452 free_binding_level = level;
1455 /* Push a definition or a declaration of struct, union or enum tag "name".
1456 "type" should be the type node.
1457 We assume that the tag "name" is not already defined.
1459 Note that the definition may really be just a forward reference.
1460 In that case, the TYPE_SIZE will be zero. */
1463 pushtag (name, type)
1466 register struct binding_level *b;
1468 /* Find the proper binding level for this type tag. */
1470 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1475 /* Record the identifier as the type's name if it has none. */
1477 if (TYPE_NAME (type) == 0)
1478 TYPE_NAME (type) = name;
1481 if (b == global_binding_level)
1482 b->tags = perm_tree_cons (name, type, b->tags);
1484 b->tags = saveable_tree_cons (name, type, b->tags);
1486 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1487 tagged type we just added to the current binding level. This fake
1488 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1489 to output a representation of a tagged type, and it also gives
1490 us a convenient place to record the "scope start" address for the
1493 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1495 /* An approximation for now, so we can tell this is a function-scope tag.
1496 This will be updated in poplevel. */
1497 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1500 /* Handle when a new declaration NEWDECL
1501 has the same name as an old one OLDDECL
1502 in the same binding contour.
1503 Prints an error message if appropriate.
1505 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1506 Otherwise, return 0.
1508 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1509 and OLDDECL is in an outer binding level and should thus not be changed. */
1512 duplicate_decls (newdecl, olddecl, different_binding_level)
1513 register tree newdecl, olddecl;
1514 int different_binding_level;
1516 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1517 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1518 && DECL_INITIAL (newdecl) != 0);
1519 tree oldtype = TREE_TYPE (olddecl);
1520 tree newtype = TREE_TYPE (newdecl);
1523 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1524 DECL_MACHINE_ATTRIBUTES (newdecl)
1525 = merge_machine_decl_attributes (olddecl, newdecl);
1527 if (TREE_CODE (newtype) == ERROR_MARK
1528 || TREE_CODE (oldtype) == ERROR_MARK)
1531 /* New decl is completely inconsistent with the old one =>
1532 tell caller to replace the old one.
1533 This is always an error except in the case of shadowing a builtin. */
1534 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1536 if (TREE_CODE (olddecl) == FUNCTION_DECL
1537 && (DECL_BUILT_IN (olddecl)
1538 || DECL_BUILT_IN_NONANSI (olddecl)))
1540 /* If you declare a built-in or predefined function name as static,
1541 the old definition is overridden,
1542 but optionally warn this was a bad choice of name. */
1543 if (!TREE_PUBLIC (newdecl))
1547 else if (DECL_BUILT_IN (olddecl))
1548 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1550 warning_with_decl (newdecl, "shadowing library function `%s'");
1552 /* Likewise, if the built-in is not ansi, then programs can
1553 override it even globally without an error. */
1554 else if (! DECL_BUILT_IN (olddecl))
1555 warning_with_decl (newdecl,
1556 "library function `%s' declared as non-function");
1558 else if (DECL_BUILT_IN_NONANSI (olddecl))
1559 warning_with_decl (newdecl,
1560 "built-in function `%s' declared as non-function");
1562 warning_with_decl (newdecl,
1563 "built-in function `%s' declared as non-function");
1567 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1568 error_with_decl (olddecl, "previous declaration of `%s'");
1574 /* For real parm decl following a forward decl,
1575 return 1 so old decl will be reused. */
1576 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1577 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1580 /* The new declaration is the same kind of object as the old one.
1581 The declarations may partially match. Print warnings if they don't
1582 match enough. Ultimately, copy most of the information from the new
1583 decl to the old one, and keep using the old one. */
1585 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1586 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1587 && DECL_INITIAL (olddecl) == 0)
1588 /* If -traditional, avoid error for redeclaring fcn
1589 after implicit decl. */
1591 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1592 && DECL_BUILT_IN (olddecl))
1594 /* A function declaration for a built-in function. */
1595 if (!TREE_PUBLIC (newdecl))
1597 /* If you declare a built-in function name as static, the
1598 built-in definition is overridden,
1599 but optionally warn this was a bad choice of name. */
1601 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1602 /* Discard the old built-in function. */
1605 else if (!types_match)
1607 /* Accept the return type of the new declaration if same modes. */
1608 tree oldreturntype = TREE_TYPE (oldtype);
1609 tree newreturntype = TREE_TYPE (newtype);
1611 /* Make sure we put the new type in the same obstack as the old ones.
1612 If the old types are not both in the same obstack, use the
1614 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1615 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1618 push_obstacks_nochange ();
1619 end_temporary_allocation ();
1622 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1624 /* Function types may be shared, so we can't just modify
1625 the return type of olddecl's function type. */
1627 = build_function_type (newreturntype,
1628 TYPE_ARG_TYPES (oldtype));
1630 types_match = comptypes (newtype, trytype);
1634 /* Accept harmless mismatch in first argument type also.
1636 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1637 && TYPE_ARG_TYPES (oldtype) != 0
1638 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1639 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1640 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1641 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1643 /* Function types may be shared, so we can't just modify
1644 the return type of olddecl's function type. */
1646 = build_function_type (TREE_TYPE (oldtype),
1647 tree_cons (NULL_TREE,
1648 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1649 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1651 types_match = comptypes (newtype, trytype);
1655 if (! different_binding_level)
1656 TREE_TYPE (olddecl) = oldtype;
1662 /* If types don't match for a built-in, throw away the built-in. */
1663 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1667 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1668 && DECL_SOURCE_LINE (olddecl) == 0)
1670 /* A function declaration for a predeclared function
1671 that isn't actually built in. */
1672 if (!TREE_PUBLIC (newdecl))
1674 /* If you declare it as static, the
1675 default definition is overridden. */
1678 else if (!types_match)
1680 /* If the types don't match, preserve volatility indication.
1681 Later on, we will discard everything else about the
1682 default declaration. */
1683 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1686 /* Permit char *foo () to match void *foo (...) if not pedantic,
1687 if one of them came from a system header file. */
1688 else if (!types_match
1689 && TREE_CODE (olddecl) == FUNCTION_DECL
1690 && TREE_CODE (newdecl) == FUNCTION_DECL
1691 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1692 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1693 && (DECL_IN_SYSTEM_HEADER (olddecl)
1694 || DECL_IN_SYSTEM_HEADER (newdecl))
1695 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1696 && TYPE_ARG_TYPES (oldtype) == 0
1697 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1698 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1700 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1701 && TYPE_ARG_TYPES (newtype) == 0
1702 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1703 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1706 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1707 /* Make sure we keep void * as ret type, not char *. */
1708 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1709 TREE_TYPE (newdecl) = newtype = oldtype;
1711 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1712 we will come back here again. */
1713 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1715 else if (!types_match
1716 /* Permit char *foo (int, ...); followed by char *foo ();
1718 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1720 /* Return types must still match. */
1721 && comptypes (TREE_TYPE (oldtype),
1722 TREE_TYPE (newtype))
1723 && TYPE_ARG_TYPES (newtype) == 0))
1725 error_with_decl (newdecl, "conflicting types for `%s'");
1726 /* Check for function type mismatch
1727 involving an empty arglist vs a nonempty one. */
1728 if (TREE_CODE (olddecl) == FUNCTION_DECL
1729 && comptypes (TREE_TYPE (oldtype),
1730 TREE_TYPE (newtype))
1731 && ((TYPE_ARG_TYPES (oldtype) == 0
1732 && DECL_INITIAL (olddecl) == 0)
1734 (TYPE_ARG_TYPES (newtype) == 0
1735 && DECL_INITIAL (newdecl) == 0)))
1737 /* Classify the problem further. */
1738 register tree t = TYPE_ARG_TYPES (oldtype);
1740 t = TYPE_ARG_TYPES (newtype);
1741 for (; t; t = TREE_CHAIN (t))
1743 register tree type = TREE_VALUE (t);
1745 if (TREE_CHAIN (t) == 0
1746 && TYPE_MAIN_VARIANT (type) != void_type_node)
1748 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1752 if (TYPE_MAIN_VARIANT (type) == float_type_node
1753 || C_PROMOTING_INTEGER_TYPE_P (type))
1755 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1760 error_with_decl (olddecl, "previous declaration of `%s'");
1764 errmsg = redeclaration_error_message (newdecl, olddecl);
1770 error_with_decl (newdecl, "redefinition of `%s'");
1773 error_with_decl (newdecl, "redeclaration of `%s'");
1776 error_with_decl (newdecl, "conflicting declarations of `%s'");
1782 error_with_decl (olddecl,
1783 ((DECL_INITIAL (olddecl)
1784 && current_binding_level == global_binding_level)
1785 ? "`%s' previously defined here"
1786 : "`%s' previously declared here"));
1788 else if (TREE_CODE (newdecl) == TYPE_DECL
1789 && (DECL_IN_SYSTEM_HEADER (olddecl)
1790 || DECL_IN_SYSTEM_HEADER (newdecl)))
1792 warning_with_decl (newdecl, "redefinition of `%s'");
1795 ((DECL_INITIAL (olddecl)
1796 && current_binding_level == global_binding_level)
1797 ? "`%s' previously defined here"
1798 : "`%s' previously declared here"));
1800 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1801 && DECL_INITIAL (olddecl) != 0
1802 && TYPE_ARG_TYPES (oldtype) == 0
1803 && TYPE_ARG_TYPES (newtype) != 0
1804 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1806 register tree type, parm;
1808 /* Prototype decl follows defn w/o prototype. */
1810 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1811 type = TYPE_ARG_TYPES (newtype),
1814 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1816 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1817 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1819 warning_with_decl (newdecl, "prototype for `%s' follows");
1820 warning_with_decl (olddecl, "non-prototype definition here");
1823 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1824 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1826 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1827 error_with_decl (olddecl, "non-prototype definition here");
1831 /* Type for passing arg must be consistent
1832 with that declared for the arg. */
1833 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1834 /* If -traditional, allow `unsigned int' instead of `int'
1835 in the prototype. */
1836 && (! (flag_traditional
1837 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1838 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1840 error_with_decl (newdecl,
1841 "prototype for `%s' follows and argument %d doesn't match",
1843 error_with_decl (olddecl, "non-prototype definition here");
1849 /* Warn about mismatches in various flags. */
1852 /* Warn if function is now inline
1853 but was previously declared not inline and has been called. */
1854 if (TREE_CODE (olddecl) == FUNCTION_DECL
1855 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1856 && TREE_USED (olddecl))
1857 warning_with_decl (newdecl,
1858 "`%s' declared inline after being called");
1859 if (TREE_CODE (olddecl) == FUNCTION_DECL
1860 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1861 && DECL_INITIAL (olddecl) != 0)
1862 warning_with_decl (newdecl,
1863 "`%s' declared inline after its definition");
1865 /* If pedantic, warn when static declaration follows a non-static
1866 declaration. Otherwise, do so only for functions. */
1867 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1868 && TREE_PUBLIC (olddecl)
1869 && !TREE_PUBLIC (newdecl))
1870 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1872 /* If warn_traditional, warn when a non-static function
1873 declaration follows a static one. */
1874 if (warn_traditional
1875 && TREE_CODE (olddecl) == FUNCTION_DECL
1876 && !TREE_PUBLIC (olddecl)
1877 && TREE_PUBLIC (newdecl))
1878 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1880 /* Warn when const declaration follows a non-const
1881 declaration, but not for functions. */
1882 if (TREE_CODE (olddecl) != FUNCTION_DECL
1883 && !TREE_READONLY (olddecl)
1884 && TREE_READONLY (newdecl))
1885 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1886 /* These bits are logically part of the type, for variables.
1887 But not for functions
1888 (where qualifiers are not valid ANSI anyway). */
1889 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1890 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1891 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1892 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1896 /* Optionally warn about more than one declaration for the same name. */
1897 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1898 /* Don't warn about a function declaration
1899 followed by a definition. */
1900 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1901 && DECL_INITIAL (olddecl) == 0)
1902 /* Don't warn about extern decl followed by (tentative) definition. */
1903 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1905 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1906 warning_with_decl (olddecl, "previous declaration of `%s'");
1909 /* Copy all the DECL_... slots specified in the new decl
1910 except for any that we copy here from the old type.
1912 Past this point, we don't change OLDTYPE and NEWTYPE
1913 even if we change the types of NEWDECL and OLDDECL. */
1917 /* When copying info to olddecl, we store into write_olddecl
1918 instead. This allows us to avoid modifying olddecl when
1919 different_binding_level is true. */
1920 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1922 /* Make sure we put the new type in the same obstack as the old ones.
1923 If the old types are not both in the same obstack, use the permanent
1925 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1926 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1929 push_obstacks_nochange ();
1930 end_temporary_allocation ();
1933 /* Merge the data types specified in the two decls. */
1934 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1936 if (different_binding_level)
1938 = build_type_attribute_variant
1940 merge_attributes (TYPE_ATTRIBUTES (newtype),
1941 TYPE_ATTRIBUTES (oldtype)));
1944 = TREE_TYPE (olddecl)
1945 = common_type (newtype, oldtype);
1948 /* Lay the type out, unless already done. */
1949 if (oldtype != TREE_TYPE (newdecl))
1951 if (TREE_TYPE (newdecl) != error_mark_node)
1952 layout_type (TREE_TYPE (newdecl));
1953 if (TREE_CODE (newdecl) != FUNCTION_DECL
1954 && TREE_CODE (newdecl) != TYPE_DECL
1955 && TREE_CODE (newdecl) != CONST_DECL)
1956 layout_decl (newdecl, 0);
1960 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1961 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1962 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1963 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1964 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1967 /* Keep the old rtl since we can safely use it. */
1968 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1970 /* Merge the type qualifiers. */
1971 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1972 && !TREE_THIS_VOLATILE (newdecl))
1973 TREE_THIS_VOLATILE (write_olddecl) = 0;
1974 if (TREE_READONLY (newdecl))
1975 TREE_READONLY (write_olddecl) = 1;
1976 if (TREE_THIS_VOLATILE (newdecl))
1978 TREE_THIS_VOLATILE (write_olddecl) = 1;
1979 if (TREE_CODE (newdecl) == VAR_DECL)
1980 make_var_volatile (newdecl);
1983 /* Keep source location of definition rather than declaration. */
1984 /* When called with different_binding_level set, keep the old
1985 information so that meaningful diagnostics can be given. */
1986 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1987 && ! different_binding_level)
1989 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1990 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1993 /* Merge the unused-warning information. */
1994 if (DECL_IN_SYSTEM_HEADER (olddecl))
1995 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1996 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1997 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1999 /* Merge the initialization information. */
2000 /* When called with different_binding_level set, don't copy over
2001 DECL_INITIAL, so that we don't accidentally change function
2002 declarations into function definitions. */
2003 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
2004 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2006 /* Merge the section attribute.
2007 We want to issue an error if the sections conflict but that must be
2008 done later in decl_attributes since we are called before attributes
2010 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2011 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2013 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2015 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2016 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2018 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2019 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2020 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
2021 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
2026 /* If cannot merge, then use the new type and qualifiers,
2027 and don't preserve the old rtl. */
2028 else if (! different_binding_level)
2030 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2031 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2032 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2033 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2036 /* Merge the storage class information. */
2037 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
2038 /* For functions, static overrides non-static. */
2039 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2041 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2042 /* This is since we don't automatically
2043 copy the attributes of NEWDECL into OLDDECL. */
2044 /* No need to worry about different_binding_level here because
2045 then TREE_PUBLIC (newdecl) was true. */
2046 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2047 /* If this clears `static', clear it in the identifier too. */
2048 if (! TREE_PUBLIC (olddecl))
2049 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2051 if (DECL_EXTERNAL (newdecl))
2053 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2054 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2055 /* An extern decl does not override previous storage class. */
2056 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2057 if (! DECL_EXTERNAL (newdecl))
2058 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2062 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2063 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2066 /* If either decl says `inline', this fn is inline,
2067 unless its definition was passed already. */
2068 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
2069 DECL_INLINE (olddecl) = 1;
2070 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
2072 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2074 if (DECL_BUILT_IN (olddecl))
2076 /* Get rid of any built-in function if new arg types don't match it
2077 or if we have a function definition. */
2078 if (! types_match || new_is_definition)
2080 if (! different_binding_level)
2082 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2083 DECL_BUILT_IN (olddecl) = 0;
2088 /* If redeclaring a builtin function, and not a definition,
2089 it stays built in. */
2090 DECL_BUILT_IN (newdecl) = 1;
2091 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2094 /* Also preserve various other info from the definition. */
2095 else if (! new_is_definition)
2096 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2097 if (! new_is_definition)
2099 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2100 /* When called with different_binding_level set, don't copy over
2101 DECL_INITIAL, so that we don't accidentally change function
2102 declarations into function definitions. */
2103 if (! different_binding_level)
2104 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2105 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2106 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2107 if (DECL_INLINE (newdecl))
2108 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2111 if (different_binding_level)
2113 /* Don't output a duplicate symbol or debugging information for this
2116 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2117 just have two declarations without a definition. VAR_DECLs may need
2118 the same treatment, I'm not sure. */
2119 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2120 DECL_IGNORED_P (newdecl) = 1;
2122 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2126 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2127 But preserve OLDDECL's DECL_UID. */
2129 register unsigned olddecl_uid = DECL_UID (olddecl);
2131 bcopy ((char *) newdecl + sizeof (struct tree_common),
2132 (char *) olddecl + sizeof (struct tree_common),
2133 sizeof (struct tree_decl) - sizeof (struct tree_common));
2134 DECL_UID (olddecl) = olddecl_uid;
2137 /* NEWDECL contains the merged attribute lists.
2138 Update OLDDECL to be the same. */
2139 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2144 /* Record a decl-node X as belonging to the current lexical scope.
2145 Check for errors (such as an incompatible declaration for the same
2146 name already seen in the same scope).
2148 Returns either X or an old decl for the same name.
2149 If an old decl is returned, it may have been smashed
2150 to agree with what X says. */
2157 register tree name = DECL_NAME (x);
2158 register struct binding_level *b = current_binding_level;
2160 DECL_CONTEXT (x) = current_function_decl;
2161 /* A local extern declaration for a function doesn't constitute nesting.
2162 A local auto declaration does, since it's a forward decl
2163 for a nested function coming later. */
2164 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2165 && DECL_EXTERNAL (x))
2166 DECL_CONTEXT (x) = 0;
2168 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2169 && x != IDENTIFIER_IMPLICIT_DECL (name)
2170 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2171 && !DECL_IN_SYSTEM_HEADER (x))
2172 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2178 int different_binding_level = 0;
2180 t = lookup_name_current_level (name);
2181 /* Don't type check externs here when -traditional. This is so that
2182 code with conflicting declarations inside blocks will get warnings
2183 not errors. X11 for instance depends on this. */
2184 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2186 t = IDENTIFIER_GLOBAL_VALUE (name);
2187 /* Type decls at global scope don't conflict with externs declared
2188 inside lexical blocks. */
2189 if (t && TREE_CODE (t) == TYPE_DECL)
2191 different_binding_level = 1;
2193 if (t != 0 && t == error_mark_node)
2194 /* error_mark_node is 0 for a while during initialization! */
2197 error_with_decl (x, "`%s' used prior to declaration");
2202 file = DECL_SOURCE_FILE (t);
2203 line = DECL_SOURCE_LINE (t);
2206 /* If this decl is `static' and an implicit decl was seen previously,
2207 warn. But don't complain if -traditional,
2208 since traditional compilers don't complain. */
2209 if (! flag_traditional && TREE_PUBLIC (name)
2210 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2211 sets this for all functions. */
2212 && ! TREE_PUBLIC (x)
2213 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2214 /* We used to warn also for explicit extern followed by static,
2215 but sometimes you need to do it that way. */
2216 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2218 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2219 IDENTIFIER_POINTER (name));
2220 pedwarn_with_file_and_line
2221 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2222 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2223 "previous declaration of `%s'",
2224 IDENTIFIER_POINTER (name));
2225 TREE_THIS_VOLATILE (name) = 1;
2228 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2230 if (TREE_CODE (t) == PARM_DECL)
2232 /* Don't allow more than one "real" duplicate
2233 of a forward parm decl. */
2234 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2240 /* If we are processing a typedef statement, generate a whole new
2241 ..._TYPE node (which will be just an variant of the existing
2242 ..._TYPE node with identical properties) and then install the
2243 TYPE_DECL node generated to represent the typedef name as the
2244 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2246 The whole point here is to end up with a situation where each
2247 and every ..._TYPE node the compiler creates will be uniquely
2248 associated with AT MOST one node representing a typedef name.
2249 This way, even though the compiler substitutes corresponding
2250 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2251 early on, later parts of the compiler can always do the reverse
2252 translation and get back the corresponding typedef name. For
2255 typedef struct S MY_TYPE;
2258 Later parts of the compiler might only know that `object' was of
2259 type `struct S' if it were not for code just below. With this
2260 code however, later parts of the compiler see something like:
2262 struct S' == struct S
2263 typedef struct S' MY_TYPE;
2266 And they can then deduce (from the node for type struct S') that
2267 the original object declaration was:
2271 Being able to do this is important for proper support of protoize,
2272 and also for generating precise symbolic debugging information
2273 which takes full account of the programmer's (typedef) vocabulary.
2275 Obviously, we don't want to generate a duplicate ..._TYPE node if
2276 the TYPE_DECL node that we are now processing really represents a
2277 standard built-in type.
2279 Since all standard types are effectively declared at line zero
2280 in the source file, we can easily check to see if we are working
2281 on a standard type by checking the current value of lineno. */
2283 if (TREE_CODE (x) == TYPE_DECL)
2285 if (DECL_SOURCE_LINE (x) == 0)
2287 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2288 TYPE_NAME (TREE_TYPE (x)) = x;
2290 else if (TREE_TYPE (x) != error_mark_node
2291 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2293 tree tt = TREE_TYPE (x);
2294 DECL_ORIGINAL_TYPE (x) = tt;
2295 tt = build_type_copy (tt);
2301 /* Multiple external decls of the same identifier ought to match.
2302 Check against both global declarations (when traditional) and out of
2303 scope (limbo) block level declarations.
2305 We get warnings about inline functions where they are defined.
2306 Avoid duplicate warnings where they are used. */
2307 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2311 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2312 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2313 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2314 decl = IDENTIFIER_GLOBAL_VALUE (name);
2315 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2316 /* Decls in limbo are always extern, so no need to check that. */
2317 decl = IDENTIFIER_LIMBO_VALUE (name);
2321 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2322 /* If old decl is built-in, we already warned if we should. */
2323 && !DECL_BUILT_IN (decl))
2325 pedwarn_with_decl (x,
2326 "type mismatch with previous external decl");
2327 pedwarn_with_decl (decl, "previous external decl of `%s'");
2331 /* If a function has had an implicit declaration, and then is defined,
2332 make sure they are compatible. */
2334 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2335 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2336 && TREE_CODE (x) == FUNCTION_DECL
2337 && ! comptypes (TREE_TYPE (x),
2338 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2340 warning_with_decl (x, "type mismatch with previous implicit declaration");
2341 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2342 "previous implicit declaration of `%s'");
2345 /* In PCC-compatibility mode, extern decls of vars with no current decl
2346 take effect at top level no matter where they are. */
2347 if (flag_traditional && DECL_EXTERNAL (x)
2348 && lookup_name (name) == 0)
2350 tree type = TREE_TYPE (x);
2352 /* But don't do this if the type contains temporary nodes. */
2355 if (type == error_mark_node)
2357 if (! TREE_PERMANENT (type))
2359 warning_with_decl (x, "type of external `%s' is not global");
2360 /* By exiting the loop early, we leave TYPE nonzero,
2361 and thus prevent globalization of the decl. */
2364 else if (TREE_CODE (type) == FUNCTION_TYPE
2365 && TYPE_ARG_TYPES (type) != 0)
2366 /* The types might not be truly local,
2367 but the list of arg types certainly is temporary.
2368 Since prototypes are nontraditional,
2369 ok not to do the traditional thing. */
2371 type = TREE_TYPE (type);
2375 b = global_binding_level;
2378 /* This name is new in its binding level.
2379 Install the new declaration and return it. */
2380 if (b == global_binding_level)
2382 /* Install a global value. */
2384 /* If the first global decl has external linkage,
2385 warn if we later see static one. */
2386 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2387 TREE_PUBLIC (name) = 1;
2389 IDENTIFIER_GLOBAL_VALUE (name) = x;
2391 /* We no longer care about any previous block level declarations. */
2392 IDENTIFIER_LIMBO_VALUE (name) = 0;
2394 /* Don't forget if the function was used via an implicit decl. */
2395 if (IDENTIFIER_IMPLICIT_DECL (name)
2396 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2397 TREE_USED (x) = 1, TREE_USED (name) = 1;
2399 /* Don't forget if its address was taken in that way. */
2400 if (IDENTIFIER_IMPLICIT_DECL (name)
2401 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2402 TREE_ADDRESSABLE (x) = 1;
2404 /* Warn about mismatches against previous implicit decl. */
2405 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2406 /* If this real decl matches the implicit, don't complain. */
2407 && ! (TREE_CODE (x) == FUNCTION_DECL
2408 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2409 == integer_type_node)))
2410 pedwarn ("`%s' was previously implicitly declared to return `int'",
2411 IDENTIFIER_POINTER (name));
2413 /* If this decl is `static' and an `extern' was seen previously,
2414 that is erroneous. */
2415 if (TREE_PUBLIC (name)
2416 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2418 /* Okay to redeclare an ANSI built-in as static. */
2419 if (t != 0 && DECL_BUILT_IN (t))
2421 /* Okay to declare a non-ANSI built-in as anything. */
2422 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2424 /* Okay to have global type decl after an earlier extern
2425 declaration inside a lexical block. */
2426 else if (TREE_CODE (x) == TYPE_DECL)
2428 else if (IDENTIFIER_IMPLICIT_DECL (name))
2430 if (! TREE_THIS_VOLATILE (name))
2431 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2432 IDENTIFIER_POINTER (name));
2435 pedwarn ("`%s' was declared `extern' and later `static'",
2436 IDENTIFIER_POINTER (name));
2441 /* Here to install a non-global value. */
2442 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2443 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2444 IDENTIFIER_LOCAL_VALUE (name) = x;
2446 /* If this is an extern function declaration, see if we
2447 have a global definition or declaration for the function. */
2449 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2451 && TREE_CODE (x) == FUNCTION_DECL
2452 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2454 /* We have one. Their types must agree. */
2455 if (! comptypes (TREE_TYPE (x),
2456 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2457 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2460 /* Inner extern decl is inline if global one is.
2461 Copy enough to really inline it. */
2462 if (DECL_INLINE (oldglobal))
2464 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2465 DECL_INITIAL (x) = (current_function_decl == oldglobal
2466 ? 0 : DECL_INITIAL (oldglobal));
2467 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2468 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2469 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2470 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2471 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2472 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2474 /* Inner extern decl is built-in if global one is. */
2475 if (DECL_BUILT_IN (oldglobal))
2477 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2478 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2480 /* Keep the arg types from a file-scope fcn defn. */
2481 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2482 && DECL_INITIAL (oldglobal)
2483 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2484 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2488 #if 0 /* This case is probably sometimes the right thing to do. */
2489 /* If we have a local external declaration,
2490 then any file-scope declaration should not
2491 have been static. */
2492 if (oldlocal == 0 && oldglobal != 0
2493 && !TREE_PUBLIC (oldglobal)
2494 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2495 warning ("`%s' locally external but globally static",
2496 IDENTIFIER_POINTER (name));
2499 /* If we have a local external declaration,
2500 and no file-scope declaration has yet been seen,
2501 then if we later have a file-scope decl it must not be static. */
2503 && DECL_EXTERNAL (x)
2507 TREE_PUBLIC (name) = 1;
2509 /* Save this decl, so that we can do type checking against
2510 other decls after it falls out of scope.
2512 Only save it once. This prevents temporary decls created in
2513 expand_inline_function from being used here, since this
2514 will have been set when the inline function was parsed.
2515 It also helps give slightly better warnings. */
2516 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2517 IDENTIFIER_LIMBO_VALUE (name) = x;
2520 /* Warn if shadowing an argument at the top level of the body. */
2521 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2522 /* This warning doesn't apply to the parms of a nested fcn. */
2523 && ! current_binding_level->parm_flag
2524 /* Check that this is one level down from the parms. */
2525 && current_binding_level->level_chain->parm_flag
2526 /* Check that the decl being shadowed
2527 comes from the parm level, one level up. */
2528 && chain_member (oldlocal, current_binding_level->level_chain->names))
2530 if (TREE_CODE (oldlocal) == PARM_DECL)
2531 pedwarn ("declaration of `%s' shadows a parameter",
2532 IDENTIFIER_POINTER (name));
2534 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2535 IDENTIFIER_POINTER (name));
2538 /* Maybe warn if shadowing something else. */
2539 else if (warn_shadow && !DECL_EXTERNAL (x)
2540 /* No shadow warnings for internally generated vars. */
2541 && DECL_SOURCE_LINE (x) != 0
2542 /* No shadow warnings for vars made for inlining. */
2543 && ! DECL_FROM_INLINE (x))
2545 char *id = IDENTIFIER_POINTER (name);
2547 if (TREE_CODE (x) == PARM_DECL
2548 && current_binding_level->level_chain->parm_flag)
2549 /* Don't warn about the parm names in function declarator
2550 within a function declarator.
2551 It would be nice to avoid warning in any function
2552 declarator in a declaration, as opposed to a definition,
2553 but there is no way to tell it's not a definition. */
2555 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2556 warning ("declaration of `%s' shadows a parameter", id);
2557 else if (oldlocal != 0)
2558 warning ("declaration of `%s' shadows previous local", id);
2559 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2560 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2561 warning ("declaration of `%s' shadows global declaration", id);
2564 /* If storing a local value, there may already be one (inherited).
2565 If so, record it for restoration when this binding level ends. */
2567 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2570 /* Keep count of variables in this level with incomplete type. */
2571 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2575 /* Put decls on list in reverse order.
2576 We will reverse them later if necessary. */
2577 TREE_CHAIN (x) = b->names;
2583 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2586 pushdecl_top_level (x)
2590 register struct binding_level *b = current_binding_level;
2592 current_binding_level = global_binding_level;
2594 current_binding_level = b;
2598 /* Generate an implicit declaration for identifier FUNCTIONID
2599 as a function of type int (). Print a warning if appropriate. */
2602 implicitly_declare (functionid)
2606 int traditional_warning = 0;
2607 /* Only one "implicit declaration" warning per identifier. */
2608 int implicit_warning;
2610 /* Save the decl permanently so we can warn if definition follows. */
2611 push_obstacks_nochange ();
2612 end_temporary_allocation ();
2614 /* We used to reuse an old implicit decl here,
2615 but this loses with inline functions because it can clobber
2616 the saved decl chains. */
2617 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2618 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2620 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2622 /* Warn of implicit decl following explicit local extern decl.
2623 This is probably a program designed for traditional C. */
2624 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2625 traditional_warning = 1;
2627 /* Warn once of an implicit declaration. */
2628 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2630 DECL_EXTERNAL (decl) = 1;
2631 TREE_PUBLIC (decl) = 1;
2633 /* Record that we have an implicit decl and this is it. */
2634 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2636 /* ANSI standard says implicit declarations are in the innermost block.
2637 So we record the decl in the standard fashion.
2638 If flag_traditional is set, pushdecl does it top-level. */
2641 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2642 maybe_objc_check_decl (decl);
2644 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2646 if (mesg_implicit_function_declaration && implicit_warning)
2648 if (mesg_implicit_function_declaration == 2)
2649 error ("implicit declaration of function `%s'",
2650 IDENTIFIER_POINTER (functionid));
2652 warning ("implicit declaration of function `%s'",
2653 IDENTIFIER_POINTER (functionid));
2655 else if (warn_traditional && traditional_warning)
2656 warning ("function `%s' was previously declared within a block",
2657 IDENTIFIER_POINTER (functionid));
2659 /* Write a record describing this implicit function declaration to the
2660 prototypes file (if requested). */
2662 gen_aux_info_record (decl, 0, 1, 0);
2669 /* Return zero if the declaration NEWDECL is valid
2670 when the declaration OLDDECL (assumed to be for the same name)
2671 has already been seen.
2672 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2673 and 3 if it is a conflicting declaration. */
2676 redeclaration_error_message (newdecl, olddecl)
2677 tree newdecl, olddecl;
2679 if (TREE_CODE (newdecl) == TYPE_DECL)
2681 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2683 /* pushdecl creates distinct types for TYPE_DECLs by calling
2684 build_type_copy, so the above comparison generally fails. We do
2685 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2686 is equivalent to what this code used to do before the build_type_copy
2687 call. The variant type distinction should not matter for traditional
2688 code, because it doesn't have type qualifiers. */
2689 if (flag_traditional
2690 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2692 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2696 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2698 /* Declarations of functions can insist on internal linkage
2699 but they can't be inconsistent with internal linkage,
2700 so there can be no error on that account.
2701 However defining the same name twice is no good. */
2702 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2703 /* However, defining once as extern inline and a second
2704 time in another way is ok. */
2705 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2706 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2710 else if (current_binding_level == global_binding_level)
2712 /* Objects declared at top level: */
2713 /* If at least one is a reference, it's ok. */
2714 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2716 /* Reject two definitions. */
2717 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2719 /* Now we have two tentative defs, or one tentative and one real def. */
2720 /* Insist that the linkage match. */
2721 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2725 else if (current_binding_level->parm_flag
2726 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2730 /* Newdecl has block scope. If olddecl has block scope also, then
2731 reject two definitions, and reject a definition together with an
2732 external reference. Otherwise, it is OK, because newdecl must
2733 be an extern reference to olddecl. */
2734 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2735 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2741 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2742 Create one if none exists so far for the current function.
2743 This function is called for both label definitions and label references. */
2749 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2751 if (current_function_decl == 0)
2753 error ("label %s referenced outside of any function",
2754 IDENTIFIER_POINTER (id));
2758 /* Use a label already defined or ref'd with this name. */
2761 /* But not if it is inherited and wasn't declared to be inheritable. */
2762 if (DECL_CONTEXT (decl) != current_function_decl
2763 && ! C_DECLARED_LABEL_FLAG (decl))
2764 return shadow_label (id);
2768 decl = build_decl (LABEL_DECL, id, void_type_node);
2770 /* Make sure every label has an rtx. */
2773 /* A label not explicitly declared must be local to where it's ref'd. */
2774 DECL_CONTEXT (decl) = current_function_decl;
2776 DECL_MODE (decl) = VOIDmode;
2778 /* Say where one reference is to the label,
2779 for the sake of the error if it is not defined. */
2780 DECL_SOURCE_LINE (decl) = lineno;
2781 DECL_SOURCE_FILE (decl) = input_filename;
2783 IDENTIFIER_LABEL_VALUE (id) = decl;
2785 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2790 /* Make a label named NAME in the current function,
2791 shadowing silently any that may be inherited from containing functions
2792 or containing scopes.
2794 Note that valid use, if the label being shadowed
2795 comes from another scope in the same function,
2796 requires calling declare_nonlocal_label right away. */
2802 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2808 /* Check to make sure that the label hasn't already been declared
2809 at this label scope */
2810 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2811 if (TREE_VALUE (dup) == decl)
2813 error ("duplicate label declaration `%s'",
2814 IDENTIFIER_POINTER (name));
2815 error_with_decl (TREE_VALUE (dup),
2816 "this is a previous declaration");
2817 /* Just use the previous declaration. */
2818 return lookup_label (name);
2821 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2822 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2825 return lookup_label (name);
2828 /* Define a label, specifying the location in the source file.
2829 Return the LABEL_DECL node for the label, if the definition is valid.
2830 Otherwise return 0. */
2833 define_label (filename, line, name)
2838 tree decl = lookup_label (name);
2840 /* If label with this name is known from an outer context, shadow it. */
2841 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2843 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2844 IDENTIFIER_LABEL_VALUE (name) = 0;
2845 decl = lookup_label (name);
2848 if (DECL_INITIAL (decl) != 0)
2850 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2855 /* Mark label as having been defined. */
2856 DECL_INITIAL (decl) = error_mark_node;
2857 /* Say where in the source. */
2858 DECL_SOURCE_FILE (decl) = filename;
2859 DECL_SOURCE_LINE (decl) = line;
2864 /* Return the list of declarations of the current level.
2865 Note that this list is in reverse order unless/until
2866 you nreverse it; and when you do nreverse it, you must
2867 store the result back using `storedecls' or you will lose. */
2872 return current_binding_level->names;
2875 /* Return the list of type-tags (for structs, etc) of the current level. */
2880 return current_binding_level->tags;
2883 /* Store the list of declarations of the current level.
2884 This is done for the parameter declarations of a function being defined,
2885 after they are modified in the light of any missing parameters. */
2891 current_binding_level->names = decls;
2894 /* Similarly, store the list of tags of the current level. */
2900 current_binding_level->tags = tags;
2903 /* Given NAME, an IDENTIFIER_NODE,
2904 return the structure (or union or enum) definition for that name.
2905 Searches binding levels from BINDING_LEVEL up to the global level.
2906 If THISLEVEL_ONLY is nonzero, searches only the specified context
2907 (but skips any tag-transparent contexts to find one that is
2908 meaningful for tags).
2909 CODE says which kind of type the caller wants;
2910 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2911 If the wrong kind of type is found, an error is reported. */
2914 lookup_tag (code, name, binding_level, thislevel_only)
2915 enum tree_code code;
2916 struct binding_level *binding_level;
2920 register struct binding_level *level;
2922 for (level = binding_level; level; level = level->level_chain)
2925 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2927 if (TREE_PURPOSE (tail) == name)
2929 if (TREE_CODE (TREE_VALUE (tail)) != code)
2931 /* Definition isn't the kind we were looking for. */
2932 pending_invalid_xref = name;
2933 pending_invalid_xref_file = input_filename;
2934 pending_invalid_xref_line = lineno;
2936 return TREE_VALUE (tail);
2939 if (thislevel_only && ! level->tag_transparent)
2945 /* Print an error message now
2946 for a recent invalid struct, union or enum cross reference.
2947 We don't print them immediately because they are not invalid
2948 when used in the `struct foo;' construct for shadowing. */
2951 pending_xref_error ()
2953 if (pending_invalid_xref != 0)
2954 error_with_file_and_line (pending_invalid_xref_file,
2955 pending_invalid_xref_line,
2956 "`%s' defined as wrong kind of tag",
2957 IDENTIFIER_POINTER (pending_invalid_xref));
2958 pending_invalid_xref = 0;
2961 /* Given a type, find the tag that was defined for it and return the tag name.
2962 Otherwise return 0. */
2965 lookup_tag_reverse (type)
2968 register struct binding_level *level;
2970 for (level = current_binding_level; level; level = level->level_chain)
2973 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2975 if (TREE_VALUE (tail) == type)
2976 return TREE_PURPOSE (tail);
2982 /* Look up NAME in the current binding level and its superiors
2983 in the namespace of variables, functions and typedefs.
2984 Return a ..._DECL node of some kind representing its definition,
2985 or return 0 if it is undefined. */
2992 if (current_binding_level != global_binding_level
2993 && IDENTIFIER_LOCAL_VALUE (name))
2994 val = IDENTIFIER_LOCAL_VALUE (name);
2996 val = IDENTIFIER_GLOBAL_VALUE (name);
3000 /* Similar to `lookup_name' but look only at current binding level. */
3003 lookup_name_current_level (name)
3008 if (current_binding_level == global_binding_level)
3009 return IDENTIFIER_GLOBAL_VALUE (name);
3011 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
3014 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
3015 if (DECL_NAME (t) == name)
3021 /* Create the predefined scalar types of C,
3022 and some nodes representing standard constants (0, 1, (void *) 0).
3023 Initialize the global binding level.
3024 Make definitions for built-in primitive functions. */
3027 init_decl_processing ()
3029 register tree endlink;
3030 /* Either char* or void*. */
3031 tree traditional_ptr_type_node;
3032 /* Data types of memcpy and strlen. */
3033 tree memcpy_ftype, memset_ftype, strlen_ftype;
3034 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
3035 int wchar_type_size;
3037 tree array_domain_type;
3039 current_function_decl = NULL;
3040 named_labels = NULL;
3041 current_binding_level = NULL_BINDING_LEVEL;
3042 free_binding_level = NULL_BINDING_LEVEL;
3043 pushlevel (0); /* make the binding_level structure for global names */
3044 global_binding_level = current_binding_level;
3046 /* Define `int' and `char' first so that dbx will output them first. */
3048 integer_type_node = make_signed_type (INT_TYPE_SIZE);
3049 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
3050 integer_type_node));
3052 /* Define `char', which is like either `signed char' or `unsigned char'
3053 but not the same as either. */
3057 ? make_signed_type (CHAR_TYPE_SIZE)
3058 : make_unsigned_type (CHAR_TYPE_SIZE));
3059 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
3062 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
3063 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
3064 long_integer_type_node));
3066 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
3067 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
3068 unsigned_type_node));
3070 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
3071 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3072 long_unsigned_type_node));
3074 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
3075 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3076 long_long_integer_type_node));
3078 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
3079 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3080 long_long_unsigned_type_node));
3082 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3084 short_integer_type_node));
3086 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
3087 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3088 short_unsigned_type_node));
3090 /* `unsigned long' is the standard type for sizeof.
3091 Traditionally, use a signed type.
3092 Note that stddef.h uses `unsigned long',
3093 and this must agree, even if long and int are the same size. */
3095 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3096 if (flag_traditional && TREE_UNSIGNED (sizetype))
3097 set_sizetype (signed_type (sizetype));
3100 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3102 error_mark_node = make_node (ERROR_MARK);
3103 TREE_TYPE (error_mark_node) = error_mark_node;
3105 /* Define both `signed char' and `unsigned char'. */
3106 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3107 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3108 signed_char_type_node));
3110 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3111 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3112 unsigned_char_type_node));
3114 /* Create the widest literal types. */
3115 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3116 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3117 widest_integer_literal_type_node));
3119 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3120 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3121 widest_unsigned_literal_type_node));
3123 /* Now all the integer mode types. */
3124 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3125 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3127 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3128 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3130 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3131 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3133 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3134 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3136 #if HOST_BITS_PER_WIDE_INT >= 64
3137 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3138 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3141 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3142 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3144 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3145 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3147 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3148 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3150 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3151 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3153 #if HOST_BITS_PER_WIDE_INT >= 64
3154 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3155 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3158 float_type_node = make_node (REAL_TYPE);
3159 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3160 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3162 layout_type (float_type_node);
3164 double_type_node = make_node (REAL_TYPE);
3165 if (flag_short_double)
3166 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3168 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3169 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3171 layout_type (double_type_node);
3173 long_double_type_node = make_node (REAL_TYPE);
3174 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3175 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3176 long_double_type_node));
3177 layout_type (long_double_type_node);
3179 complex_integer_type_node = make_node (COMPLEX_TYPE);
3180 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3181 complex_integer_type_node));
3182 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3183 layout_type (complex_integer_type_node);
3185 complex_float_type_node = make_node (COMPLEX_TYPE);
3186 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3187 complex_float_type_node));
3188 TREE_TYPE (complex_float_type_node) = float_type_node;
3189 layout_type (complex_float_type_node);
3191 complex_double_type_node = make_node (COMPLEX_TYPE);
3192 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3193 complex_double_type_node));
3194 TREE_TYPE (complex_double_type_node) = double_type_node;
3195 layout_type (complex_double_type_node);
3197 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3198 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3199 complex_long_double_type_node));
3200 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3201 layout_type (complex_long_double_type_node);
3204 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3205 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3206 signed_wchar_type_node = signed_type (wchar_type_node);
3207 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3209 integer_zero_node = build_int_2 (0, 0);
3210 TREE_TYPE (integer_zero_node) = integer_type_node;
3211 integer_one_node = build_int_2 (1, 0);
3212 TREE_TYPE (integer_one_node) = integer_type_node;
3214 boolean_type_node = integer_type_node;
3215 boolean_true_node = integer_one_node;
3216 boolean_false_node = integer_zero_node;
3218 size_zero_node = build_int_2 (0, 0);
3219 TREE_TYPE (size_zero_node) = sizetype;
3220 size_one_node = build_int_2 (1, 0);
3221 TREE_TYPE (size_one_node) = sizetype;
3223 void_type_node = make_node (VOID_TYPE);
3224 pushdecl (build_decl (TYPE_DECL,
3225 ridpointers[(int) RID_VOID], void_type_node));
3226 layout_type (void_type_node); /* Uses integer_zero_node */
3227 /* We are not going to have real types in C with less than byte alignment,
3228 so we might as well not have any types that claim to have it. */
3229 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3231 null_pointer_node = build_int_2 (0, 0);
3232 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3233 layout_type (TREE_TYPE (null_pointer_node));
3235 string_type_node = build_pointer_type (char_type_node);
3236 const_string_type_node
3237 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3239 /* Make a type to be the domain of a few array types
3240 whose domains don't really matter.
3241 200 is small enough that it always fits in size_t
3242 and large enough that it can hold most function names for the
3243 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3244 array_domain_type = build_index_type (build_int_2 (200, 0));
3246 /* make a type for arrays of characters.
3247 With luck nothing will ever really depend on the length of this
3249 char_array_type_node
3250 = build_array_type (char_type_node, array_domain_type);
3251 /* Likewise for arrays of ints. */
3253 = build_array_type (integer_type_node, array_domain_type);
3254 /* This is for wide string constants. */
3255 wchar_array_type_node
3256 = build_array_type (wchar_type_node, array_domain_type);
3258 default_function_type
3259 = build_function_type (integer_type_node, NULL_TREE);
3261 ptr_type_node = build_pointer_type (void_type_node);
3263 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3265 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3268 = build_function_type (void_type_node, NULL_TREE);
3271 = build_function_type (float_type_node,
3272 tree_cons (NULL_TREE, float_type_node, endlink));
3275 = build_function_type (double_type_node,
3276 tree_cons (NULL_TREE, double_type_node, endlink));
3278 ldouble_ftype_ldouble
3279 = build_function_type (long_double_type_node,
3280 tree_cons (NULL_TREE, long_double_type_node,
3283 double_ftype_double_double
3284 = build_function_type (double_type_node,
3285 tree_cons (NULL_TREE, double_type_node,
3286 tree_cons (NULL_TREE,
3287 double_type_node, endlink)));
3290 = build_function_type (integer_type_node,
3291 tree_cons (NULL_TREE, integer_type_node, endlink));
3294 = build_function_type (long_integer_type_node,
3295 tree_cons (NULL_TREE,
3296 long_integer_type_node, endlink));
3298 void_ftype_ptr_ptr_int
3299 = build_function_type (void_type_node,
3300 tree_cons (NULL_TREE, ptr_type_node,
3301 tree_cons (NULL_TREE, ptr_type_node,
3302 tree_cons (NULL_TREE,
3306 int_ftype_cptr_cptr_sizet
3307 = build_function_type (integer_type_node,
3308 tree_cons (NULL_TREE, const_ptr_type_node,
3309 tree_cons (NULL_TREE, const_ptr_type_node,
3310 tree_cons (NULL_TREE,
3314 void_ftype_ptr_int_int
3315 = build_function_type (void_type_node,
3316 tree_cons (NULL_TREE, ptr_type_node,
3317 tree_cons (NULL_TREE, integer_type_node,
3318 tree_cons (NULL_TREE,
3322 string_ftype_ptr_ptr /* strcpy prototype */
3323 = build_function_type (string_type_node,
3324 tree_cons (NULL_TREE, string_type_node,
3325 tree_cons (NULL_TREE,
3326 const_string_type_node,
3329 int_ftype_string_string /* strcmp prototype */
3330 = build_function_type (integer_type_node,
3331 tree_cons (NULL_TREE, const_string_type_node,
3332 tree_cons (NULL_TREE,
3333 const_string_type_node,
3336 strlen_ftype /* strlen prototype */
3337 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3338 tree_cons (NULL_TREE, const_string_type_node,
3341 traditional_ptr_type_node
3342 = (flag_traditional ? string_type_node : ptr_type_node);
3344 memcpy_ftype /* memcpy prototype */
3345 = build_function_type (traditional_ptr_type_node,
3346 tree_cons (NULL_TREE, ptr_type_node,
3347 tree_cons (NULL_TREE, const_ptr_type_node,
3348 tree_cons (NULL_TREE,
3352 memset_ftype /* memset prototype */
3353 = build_function_type (traditional_ptr_type_node,
3354 tree_cons (NULL_TREE, ptr_type_node,
3355 tree_cons (NULL_TREE, integer_type_node,
3356 tree_cons (NULL_TREE,
3360 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3362 = build_function_type (ptr_type_node,
3363 tree_cons (NULL_TREE, ptr_type_node, endlink));
3365 builtin_function ("__builtin_constant_p", default_function_type,
3366 BUILT_IN_CONSTANT_P, NULL_PTR);
3368 builtin_function ("__builtin_return_address",
3369 build_function_type (ptr_type_node,
3370 tree_cons (NULL_TREE,
3373 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3375 builtin_function ("__builtin_frame_address",
3376 build_function_type (ptr_type_node,
3377 tree_cons (NULL_TREE,
3380 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3382 builtin_function ("__builtin_aggregate_incoming_address",
3383 build_function_type (ptr_type_node, NULL_TREE),
3384 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3386 /* Hooks for the DWARF 2 __throw routine. */
3387 builtin_function ("__builtin_unwind_init",
3388 build_function_type (void_type_node, endlink),
3389 BUILT_IN_UNWIND_INIT, NULL_PTR);
3390 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3391 BUILT_IN_DWARF_CFA, NULL_PTR);
3392 builtin_function ("__builtin_dwarf_fp_regnum",
3393 build_function_type (unsigned_type_node, endlink),
3394 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3395 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3396 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3397 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3398 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3399 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3400 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3402 ("__builtin_eh_return",
3403 build_function_type (void_type_node,
3404 tree_cons (NULL_TREE, ptr_type_node,
3405 tree_cons (NULL_TREE,
3406 type_for_mode (ptr_mode, 0),
3407 tree_cons (NULL_TREE,
3410 BUILT_IN_EH_RETURN, NULL_PTR);
3412 builtin_function ("__builtin_alloca",
3413 build_function_type (ptr_type_node,
3414 tree_cons (NULL_TREE,
3417 BUILT_IN_ALLOCA, "alloca");
3418 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3419 /* Define alloca, ffs as builtins.
3420 Declare _exit just to mark it as volatile. */
3421 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3423 temp = builtin_function ("alloca",
3424 build_function_type (ptr_type_node,
3425 tree_cons (NULL_TREE,
3428 BUILT_IN_ALLOCA, NULL_PTR);
3429 /* Suppress error if redefined as a non-function. */
3430 DECL_BUILT_IN_NONANSI (temp) = 1;
3431 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3432 /* Suppress error if redefined as a non-function. */
3433 DECL_BUILT_IN_NONANSI (temp) = 1;
3434 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3436 TREE_THIS_VOLATILE (temp) = 1;
3437 TREE_SIDE_EFFECTS (temp) = 1;
3438 /* Suppress error if redefined as a non-function. */
3439 DECL_BUILT_IN_NONANSI (temp) = 1;
3442 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3443 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3445 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3447 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3449 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3451 builtin_function ("__builtin_saveregs",
3452 build_function_type (ptr_type_node, NULL_TREE),
3453 BUILT_IN_SAVEREGS, NULL_PTR);
3454 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3456 builtin_function ("__builtin_varargs",
3457 build_function_type (ptr_type_node,
3458 tree_cons (NULL_TREE,
3461 BUILT_IN_VARARGS, NULL_PTR);
3463 builtin_function ("__builtin_classify_type", default_function_type,
3464 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3465 builtin_function ("__builtin_next_arg",
3466 build_function_type (ptr_type_node, NULL_TREE),
3467 BUILT_IN_NEXT_ARG, NULL_PTR);
3468 builtin_function ("__builtin_args_info",
3469 build_function_type (integer_type_node,
3470 tree_cons (NULL_TREE,
3473 BUILT_IN_ARGS_INFO, NULL_PTR);
3475 /* Untyped call and return. */
3476 builtin_function ("__builtin_apply_args",
3477 build_function_type (ptr_type_node, NULL_TREE),
3478 BUILT_IN_APPLY_ARGS, NULL_PTR);
3480 temp = tree_cons (NULL_TREE,
3481 build_pointer_type (build_function_type (void_type_node,
3483 tree_cons (NULL_TREE,
3485 tree_cons (NULL_TREE,
3488 builtin_function ("__builtin_apply",
3489 build_function_type (ptr_type_node, temp),
3490 BUILT_IN_APPLY, NULL_PTR);
3491 builtin_function ("__builtin_return",
3492 build_function_type (void_type_node,
3493 tree_cons (NULL_TREE,
3496 BUILT_IN_RETURN, NULL_PTR);
3498 /* Currently under experimentation. */
3499 builtin_function ("__builtin_memcpy", memcpy_ftype,
3500 BUILT_IN_MEMCPY, "memcpy");
3501 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3502 BUILT_IN_MEMCMP, "memcmp");
3503 builtin_function ("__builtin_memset", memset_ftype,
3504 BUILT_IN_MEMSET, "memset");
3505 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3506 BUILT_IN_STRCMP, "strcmp");
3507 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3508 BUILT_IN_STRCPY, "strcpy");
3509 builtin_function ("__builtin_strlen", strlen_ftype,
3510 BUILT_IN_STRLEN, "strlen");
3511 builtin_function ("__builtin_sqrtf", float_ftype_float,
3512 BUILT_IN_FSQRT, "sqrtf");
3513 builtin_function ("__builtin_fsqrt", double_ftype_double,
3514 BUILT_IN_FSQRT, "sqrt");
3515 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3516 BUILT_IN_FSQRT, "sqrtl");
3517 builtin_function ("__builtin_sinf", float_ftype_float,
3518 BUILT_IN_SIN, "sinf");
3519 builtin_function ("__builtin_sin", double_ftype_double,
3520 BUILT_IN_SIN, "sin");
3521 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3522 BUILT_IN_SIN, "sinl");
3523 builtin_function ("__builtin_cosf", float_ftype_float,
3524 BUILT_IN_COS, "cosf");
3525 builtin_function ("__builtin_cos", double_ftype_double,
3526 BUILT_IN_COS, "cos");
3527 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3528 BUILT_IN_COS, "cosl");
3529 builtin_function ("__builtin_setjmp",
3530 build_function_type (integer_type_node,
3531 tree_cons (NULL_TREE,
3532 ptr_type_node, endlink)),
3533 BUILT_IN_SETJMP, NULL_PTR);
3534 builtin_function ("__builtin_longjmp",
3537 tree_cons (NULL, ptr_type_node,
3538 tree_cons (NULL_TREE,
3541 BUILT_IN_LONGJMP, NULL_PTR);
3542 builtin_function ("__builtin_trap",
3543 build_function_type (void_type_node, endlink),
3544 BUILT_IN_TRAP, NULL_PTR);
3546 /* In an ANSI C program, it is okay to supply built-in meanings
3547 for these functions, since applications cannot validly use them
3548 with any other meaning.
3549 However, honor the -fno-builtin option. */
3550 if (!flag_no_builtin)
3552 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3553 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3554 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3555 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3557 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3558 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3559 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3561 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3562 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3564 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3566 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3567 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3568 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3569 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3571 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3572 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3573 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3574 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3575 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3576 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3578 /* Declare these functions volatile
3579 to avoid spurious "control drops through" warnings. */
3580 /* Don't specify the argument types, to avoid errors
3581 from certain code which isn't valid in ANSI but which exists. */
3582 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3584 TREE_THIS_VOLATILE (temp) = 1;
3585 TREE_SIDE_EFFECTS (temp) = 1;
3586 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3587 TREE_THIS_VOLATILE (temp) = 1;
3588 TREE_SIDE_EFFECTS (temp) = 1;
3592 /* Support for these has not been written in either expand_builtin
3593 or build_function_call. */
3594 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3595 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3596 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3598 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3600 builtin_function ("__builtin_fmod", double_ftype_double_double,
3601 BUILT_IN_FMOD, NULL_PTR);
3602 builtin_function ("__builtin_frem", double_ftype_double_double,
3603 BUILT_IN_FREM, NULL_PTR);
3604 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3606 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3610 pedantic_lvalues = pedantic;
3612 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3613 declare_function_name ();
3615 start_identifier_warnings ();
3617 /* Prepare to check format strings against argument lists. */
3618 init_function_format_info ();
3622 incomplete_decl_finalize_hook = finish_incomplete_decl;
3624 lang_get_alias_set = c_get_alias_set;
3627 /* Return a definition for a builtin function named NAME and whose data type
3628 is TYPE. TYPE should be a function type with argument types.
3629 FUNCTION_CODE tells later passes how to compile calls to this function.
3630 See tree.h for its possible values.
3632 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3633 the name to be called if we can't opencode the function. */
3636 builtin_function (name, type, function_code, library_name)
3639 enum built_in_function function_code;
3640 const char *library_name;
3642 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3643 DECL_EXTERNAL (decl) = 1;
3644 TREE_PUBLIC (decl) = 1;
3645 /* If -traditional, permit redefining a builtin function any way you like.
3646 (Though really, if the program redefines these functions,
3647 it probably won't work right unless compiled with -fno-builtin.) */
3648 if (flag_traditional && name[0] != '_')
3649 DECL_BUILT_IN_NONANSI (decl) = 1;
3651 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3652 make_decl_rtl (decl, NULL_PTR, 1);
3654 if (function_code != NOT_BUILT_IN)
3656 DECL_BUILT_IN (decl) = 1;
3657 DECL_FUNCTION_CODE (decl) = function_code;
3659 /* Warn if a function in the namespace for users
3660 is used without an occasion to consider it declared. */
3661 if (name[0] != '_' || name[1] != '_')
3662 C_DECL_ANTICIPATED (decl) = 1;
3667 /* Called when a declaration is seen that contains no names to declare.
3668 If its type is a reference to a structure, union or enum inherited
3669 from a containing scope, shadow that tag name for the current scope
3670 with a forward reference.
3671 If its type defines a new named structure or union
3672 or defines an enum, it is valid but we need not do anything here.
3673 Otherwise, it is an error. */
3676 shadow_tag (declspecs)
3679 shadow_tag_warned (declspecs, 0);
3683 shadow_tag_warned (declspecs, warned)
3686 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3693 pending_invalid_xref = 0;
3695 /* Remove the attributes from declspecs, since they will confuse the
3697 split_specs_attrs (declspecs, &specs, &attrs);
3699 for (link = specs; link; link = TREE_CHAIN (link))
3701 register tree value = TREE_VALUE (link);
3702 register enum tree_code code = TREE_CODE (value);
3704 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3705 /* Used to test also that TYPE_SIZE (value) != 0.
3706 That caused warning for `struct foo;' at top level in the file. */
3708 register tree name = lookup_tag_reverse (value);
3715 if (warned != 1 && code != ENUMERAL_TYPE)
3716 /* Empty unnamed enum OK */
3718 pedwarn ("unnamed struct/union that defines no instances");
3724 t = lookup_tag (code, name, current_binding_level, 1);
3728 t = make_node (code);
3735 if (!warned && ! in_system_header)
3737 warning ("useless keyword or type name in empty declaration");
3744 error ("two types specified in one empty declaration");
3749 pedwarn ("empty declaration");
3753 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3756 groktypename (typename)
3759 if (TREE_CODE (typename) != TREE_LIST)
3761 return grokdeclarator (TREE_VALUE (typename),
3762 TREE_PURPOSE (typename),
3766 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3769 groktypename_in_parm_context (typename)
3772 if (TREE_CODE (typename) != TREE_LIST)
3774 return grokdeclarator (TREE_VALUE (typename),
3775 TREE_PURPOSE (typename),
3779 /* Decode a declarator in an ordinary declaration or data definition.
3780 This is called as soon as the type information and variable name
3781 have been parsed, before parsing the initializer if any.
3782 Here we create the ..._DECL node, fill in its type,
3783 and put it on the list of decls for the current context.
3784 The ..._DECL node is returned as the value.
3786 Exception: for arrays where the length is not specified,
3787 the type is left null, to be filled in by `finish_decl'.
3789 Function definitions do not come here; they go to start_function
3790 instead. However, external and forward declarations of functions
3791 do go through here. Structure field declarations are done by
3792 grokfield and not through here. */
3794 /* Set this to zero to debug not using the temporary obstack
3795 to parse initializers. */
3796 int debug_temp_inits = 1;
3799 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3800 tree declarator, declspecs;
3802 tree attributes, prefix_attributes;
3804 register tree decl = grokdeclarator (declarator, declspecs,
3805 NORMAL, initialized);
3807 int init_written = initialized;
3809 /* The corresponding pop_obstacks is in finish_decl. */
3810 push_obstacks_nochange ();
3812 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3813 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3814 warning_with_decl (decl, "`%s' is usually a function");
3817 /* Is it valid for this decl to have an initializer at all?
3818 If not, set INITIALIZED to zero, which will indirectly
3819 tell `finish_decl' to ignore the initializer once it is parsed. */
3820 switch (TREE_CODE (decl))
3823 /* typedef foo = bar means give foo the same type as bar.
3824 We haven't parsed bar yet, so `finish_decl' will fix that up.
3825 Any other case of an initialization in a TYPE_DECL is an error. */
3826 if (pedantic || list_length (declspecs) > 1)
3828 error ("typedef `%s' is initialized",
3829 IDENTIFIER_POINTER (DECL_NAME (decl)));
3835 error ("function `%s' is initialized like a variable",
3836 IDENTIFIER_POINTER (DECL_NAME (decl)));
3841 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3842 error ("parameter `%s' is initialized",
3843 IDENTIFIER_POINTER (DECL_NAME (decl)));
3848 /* Don't allow initializations for incomplete types
3849 except for arrays which might be completed by the initialization. */
3850 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3852 /* A complete type is ok if size is fixed. */
3854 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3855 || C_DECL_VARIABLE_SIZE (decl))
3857 error ("variable-sized object may not be initialized");
3861 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3863 error ("variable `%s' has initializer but incomplete type",
3864 IDENTIFIER_POINTER (DECL_NAME (decl)));
3867 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3869 error ("elements of array `%s' have incomplete type",
3870 IDENTIFIER_POINTER (DECL_NAME (decl)));
3877 #if 0 /* Seems redundant with grokdeclarator. */
3878 if (current_binding_level != global_binding_level
3879 && DECL_EXTERNAL (decl)
3880 && TREE_CODE (decl) != FUNCTION_DECL)
3881 warning ("declaration of `%s' has `extern' and is initialized",
3882 IDENTIFIER_POINTER (DECL_NAME (decl)));
3884 DECL_EXTERNAL (decl) = 0;
3885 if (current_binding_level == global_binding_level)
3886 TREE_STATIC (decl) = 1;
3888 /* Tell `pushdecl' this is an initialized decl
3889 even though we don't yet have the initializer expression.
3890 Also tell `finish_decl' it may store the real initializer. */
3891 DECL_INITIAL (decl) = error_mark_node;
3894 /* If this is a function declaration, write a record describing it to the
3895 prototypes file (if requested). */
3897 if (TREE_CODE (decl) == FUNCTION_DECL)
3898 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3900 /* ANSI specifies that a tentative definition which is not merged with
3901 a non-tentative definition behaves exactly like a definition with an
3902 initializer equal to zero. (Section 3.7.2)
3903 -fno-common gives strict ANSI behavior. Usually you don't want it.
3904 This matters only for variables with external linkage. */
3905 if (! flag_no_common || ! TREE_PUBLIC (decl))
3906 DECL_COMMON (decl) = 1;
3908 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3909 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3912 /* Set attributes here so if duplicate decl, will have proper attributes. */
3913 decl_attributes (decl, attributes, prefix_attributes);
3915 /* Add this decl to the current binding level.
3916 TEM may equal DECL or it may be a previous decl of the same name. */
3917 tem = pushdecl (decl);
3919 /* For a local variable, define the RTL now. */
3920 if (current_binding_level != global_binding_level
3921 /* But not if this is a duplicate decl
3922 and we preserved the rtl from the previous one
3923 (which may or may not happen). */
3924 && DECL_RTL (tem) == 0)
3926 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3928 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3929 && DECL_INITIAL (tem) != 0)
3935 /* When parsing and digesting the initializer,
3936 use temporary storage. Do this even if we will ignore the value. */
3937 if (current_binding_level == global_binding_level && debug_temp_inits)
3938 temporary_allocation ();
3944 /* Finish processing of a declaration;
3945 install its initial value.
3946 If the length of an array type is not known before,
3947 it must be determined now, from the initial value, or it is an error. */
3950 finish_decl (decl, init, asmspec_tree)
3954 register tree type = TREE_TYPE (decl);
3955 int was_incomplete = (DECL_SIZE (decl) == 0);
3956 int temporary = allocation_temporary_p ();
3959 /* If a name was specified, get the string. */
3961 asmspec = TREE_STRING_POINTER (asmspec_tree);
3963 /* If `start_decl' didn't like having an initialization, ignore it now. */
3965 if (init != 0 && DECL_INITIAL (decl) == 0)
3967 /* Don't crash if parm is initialized. */
3968 if (TREE_CODE (decl) == PARM_DECL)
3971 if (ITERATOR_P (decl))
3974 error_with_decl (decl, "iterator has no initial value");
3976 init = save_expr (init);
3981 if (TREE_CODE (decl) != TYPE_DECL)
3982 store_init_value (decl, init);
3985 /* typedef foo = bar; store the type of bar as the type of foo. */
3986 TREE_TYPE (decl) = TREE_TYPE (init);
3987 DECL_INITIAL (decl) = init = 0;
3991 /* Pop back to the obstack that is current for this binding level.
3992 This is because MAXINDEX, rtl, etc. to be made below
3993 must go in the permanent obstack. But don't discard the
3994 temporary data yet. */
3996 #if 0 /* pop_obstacks was near the end; this is what was here. */
3997 if (current_binding_level == global_binding_level && temporary)
3998 end_temporary_allocation ();
4001 /* Deduce size of array from initialization, if not already known */
4003 if (TREE_CODE (type) == ARRAY_TYPE
4004 && TYPE_DOMAIN (type) == 0
4005 && TREE_CODE (decl) != TYPE_DECL)
4008 = (TREE_STATIC (decl)
4009 /* Even if pedantic, an external linkage array
4010 may have incomplete type at first. */
4011 ? pedantic && !TREE_PUBLIC (decl)
4012 : !DECL_EXTERNAL (decl));
4014 = complete_array_type (type, DECL_INITIAL (decl), do_default);
4016 /* Get the completed type made by complete_array_type. */
4017 type = TREE_TYPE (decl);
4020 error_with_decl (decl, "initializer fails to determine size of `%s'");
4025 error_with_decl (decl, "array size missing in `%s'");
4026 /* If a `static' var's size isn't known,
4027 make it extern as well as static, so it does not get
4029 If it is not `static', then do not mark extern;
4030 finish_incomplete_decl will give it a default size
4031 and it will get allocated. */
4032 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
4033 DECL_EXTERNAL (decl) = 1;
4036 /* TYPE_MAX_VALUE is always one less than the number of elements
4037 in the array, because we start counting at zero. Therefore,
4038 warn only if the value is less than zero. */
4039 if (pedantic && TYPE_DOMAIN (type) != 0
4040 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
4041 error_with_decl (decl, "zero or negative size array `%s'");
4043 layout_decl (decl, 0);
4046 if (TREE_CODE (decl) == VAR_DECL)
4048 if (DECL_SIZE (decl) == 0
4049 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
4050 layout_decl (decl, 0);
4052 if (DECL_SIZE (decl) == 0
4053 && (TREE_STATIC (decl)
4055 /* A static variable with an incomplete type
4056 is an error if it is initialized.
4057 Also if it is not file scope.
4058 Otherwise, let it through, but if it is not `extern'
4059 then it may cause an error message later. */
4060 /* A duplicate_decls call could have changed an extern
4061 declaration into a file scope one. This can be detected
4062 by TREE_ASM_WRITTEN being set. */
4063 (DECL_INITIAL (decl) != 0
4064 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
4066 /* An automatic variable with an incomplete type
4068 !DECL_EXTERNAL (decl)))
4070 error_with_decl (decl, "storage size of `%s' isn't known");
4071 TREE_TYPE (decl) = error_mark_node;
4074 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4075 && DECL_SIZE (decl) != 0)
4077 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4078 constant_expression_warning (DECL_SIZE (decl));
4080 error_with_decl (decl, "storage size of `%s' isn't constant");
4083 if (TREE_USED (type))
4084 TREE_USED (decl) = 1;
4087 /* If this is a function and an assembler name is specified, it isn't
4088 builtin any more. Also reset DECL_RTL so we can give it its new
4090 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4092 DECL_BUILT_IN (decl) = 0;
4093 DECL_RTL (decl) = 0;
4096 /* Output the assembler code and/or RTL code for variables and functions,
4097 unless the type is an undefined structure or union.
4098 If not, it will get done when the type is completed. */
4100 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4102 if ((flag_traditional || TREE_PERMANENT (decl))
4103 && allocation_temporary_p ())
4105 push_obstacks_nochange ();
4106 end_temporary_allocation ();
4107 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4108 maybe_objc_check_decl (decl);
4109 rest_of_decl_compilation (decl, asmspec,
4110 (DECL_CONTEXT (decl) == 0
4111 || TREE_ASM_WRITTEN (decl)),
4117 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4118 maybe_objc_check_decl (decl);
4119 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4122 if (DECL_CONTEXT (decl) != 0)
4124 /* Recompute the RTL of a local array now
4125 if it used to be an incomplete type. */
4127 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4129 /* If we used it already as memory, it must stay in memory. */
4130 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4131 /* If it's still incomplete now, no init will save it. */
4132 if (DECL_SIZE (decl) == 0)
4133 DECL_INITIAL (decl) = 0;
4136 /* Compute and store the initial value. */
4137 if (TREE_CODE (decl) != FUNCTION_DECL)
4138 expand_decl_init (decl);
4142 if (TREE_CODE (decl) == TYPE_DECL)
4144 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4145 maybe_objc_check_decl (decl);
4146 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4150 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4151 /* This test used to include TREE_PERMANENT, however, we have the same
4152 problem with initializers at the function level. Such initializers get
4153 saved until the end of the function on the momentary_obstack. */
4154 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4156 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4157 space with DECL_ARG_TYPE. */
4158 && TREE_CODE (decl) != PARM_DECL)
4160 /* We need to remember that this array HAD an initialization,
4161 but discard the actual temporary nodes,
4162 since we can't have a permanent node keep pointing to them. */
4163 /* We make an exception for inline functions, since it's
4164 normal for a local extern redeclaration of an inline function
4165 to have a copy of the top-level decl's DECL_INLINE. */
4166 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4168 /* If this is a const variable, then preserve the
4169 initializer instead of discarding it so that we can optimize
4170 references to it. */
4171 /* This test used to include TREE_STATIC, but this won't be set
4172 for function level initializers. */
4173 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4175 preserve_initializer ();
4176 /* Hack? Set the permanent bit for something that is permanent,
4177 but not on the permanent obstack, so as to convince
4178 output_constant_def to make its rtl on the permanent
4180 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4182 /* The initializer and DECL must have the same (or equivalent
4183 types), but if the initializer is a STRING_CST, its type
4184 might not be on the right obstack, so copy the type
4186 TREE_TYPE (DECL_INITIAL (decl)) = type;
4189 DECL_INITIAL (decl) = error_mark_node;
4193 /* If requested, warn about definitions of large data objects. */
4195 if (warn_larger_than
4196 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4197 && !DECL_EXTERNAL (decl))
4199 register tree decl_size = DECL_SIZE (decl);
4201 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4203 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4205 if (units > larger_than_size)
4206 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4211 /* Resume permanent allocation, if not within a function. */
4212 /* The corresponding push_obstacks_nochange is in start_decl,
4213 and in push_parm_decl and in grokfield. */
4217 /* If we have gone back from temporary to permanent allocation,
4218 actually free the temporary space that we no longer need. */
4219 if (temporary && !allocation_temporary_p ())
4220 permanent_allocation (0);
4222 /* At the end of a declaration, throw away any variable type sizes
4223 of types defined inside that declaration. There is no use
4224 computing them in the following function definition. */
4225 if (current_binding_level == global_binding_level)
4226 get_pending_sizes ();
4229 /* If DECL has a cleanup, build and return that cleanup here.
4230 This is a callback called by expand_expr. */
4233 maybe_build_cleanup (decl)
4234 tree decl ATTRIBUTE_UNUSED;
4236 /* There are no cleanups in C. */
4240 /* Given a parsed parameter declaration,
4241 decode it into a PARM_DECL and push that on the current binding level.
4242 Also, for the sake of forward parm decls,
4243 record the given order of parms in `parm_order'. */
4246 push_parm_decl (parm)
4250 int old_immediate_size_expand = immediate_size_expand;
4251 /* Don't try computing parm sizes now -- wait till fn is called. */
4252 immediate_size_expand = 0;
4254 /* The corresponding pop_obstacks is in finish_decl. */
4255 push_obstacks_nochange ();
4257 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4258 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4259 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4260 TREE_PURPOSE (TREE_VALUE (parm)));
4263 if (DECL_NAME (decl))
4266 olddecl = lookup_name (DECL_NAME (decl));
4267 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4268 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4272 decl = pushdecl (decl);
4274 immediate_size_expand = old_immediate_size_expand;
4276 current_binding_level->parm_order
4277 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4279 /* Add this decl to the current binding level. */
4280 finish_decl (decl, NULL_TREE, NULL_TREE);
4283 /* Clear the given order of parms in `parm_order'.
4284 Used at start of parm list,
4285 and also at semicolon terminating forward decls. */
4290 current_binding_level->parm_order = NULL_TREE;
4293 /* Make TYPE a complete type based on INITIAL_VALUE.
4294 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4295 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4298 complete_array_type (type, initial_value, do_default)
4303 register tree maxindex = NULL_TREE;
4308 /* Note MAXINDEX is really the maximum index,
4309 one less than the size. */
4310 if (TREE_CODE (initial_value) == STRING_CST)
4313 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4314 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4317 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4319 tree elts = CONSTRUCTOR_ELTS (initial_value);
4320 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4321 for (; elts; elts = TREE_CHAIN (elts))
4323 if (TREE_PURPOSE (elts))
4324 maxindex = TREE_PURPOSE (elts);
4326 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4328 maxindex = copy_node (maxindex);
4332 /* Make an error message unless that happened already. */
4333 if (initial_value != error_mark_node)
4336 /* Prevent further error messages. */
4337 maxindex = build_int_2 (0, 0);
4344 maxindex = build_int_2 (0, 0);
4350 TYPE_DOMAIN (type) = build_index_type (maxindex);
4351 if (!TREE_TYPE (maxindex))
4352 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4355 /* Lay out the type now that we can get the real answer. */
4362 /* Given declspecs and a declarator,
4363 determine the name and type of the object declared
4364 and construct a ..._DECL node for it.
4365 (In one case we can return a ..._TYPE node instead.
4366 For invalid input we sometimes return 0.)
4368 DECLSPECS is a chain of tree_list nodes whose value fields
4369 are the storage classes and type specifiers.
4371 DECL_CONTEXT says which syntactic context this declaration is in:
4372 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4373 FUNCDEF for a function definition. Like NORMAL but a few different
4374 error messages in each case. Return value may be zero meaning
4375 this definition is too screwy to try to parse.
4376 PARM for a parameter declaration (either within a function prototype
4377 or before a function body). Make a PARM_DECL, or return void_type_node.
4378 TYPENAME if for a typename (in a cast or sizeof).
4379 Don't make a DECL node; just return the ..._TYPE node.
4380 FIELD for a struct or union field; make a FIELD_DECL.
4381 BITFIELD for a field with specified width.
4382 INITIALIZED is 1 if the decl has an initializer.
4384 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4385 It may also be so in the PARM case, for a prototype where the
4386 argument type is specified but not the name.
4388 This function is where the complicated C meanings of `static'
4389 and `extern' are interpreted. */
4392 grokdeclarator (declarator, declspecs, decl_context, initialized)
4395 enum decl_context decl_context;
4400 tree type = NULL_TREE;
4405 int type_quals = TYPE_UNQUALIFIED;
4407 int explicit_int = 0;
4408 int explicit_char = 0;
4409 int defaulted_int = 0;
4410 tree typedef_decl = 0;
4412 tree typedef_type = 0;
4413 int funcdef_flag = 0;
4414 enum tree_code innermost_code = ERROR_MARK;
4416 int size_varies = 0;
4417 tree decl_machine_attr = NULL_TREE;
4419 if (decl_context == BITFIELD)
4420 bitfield = 1, decl_context = FIELD;
4422 if (decl_context == FUNCDEF)
4423 funcdef_flag = 1, decl_context = NORMAL;
4425 push_obstacks_nochange ();
4427 if (flag_traditional && allocation_temporary_p ())
4428 end_temporary_allocation ();
4430 /* Look inside a declarator for the name being declared
4431 and get it as a string, for an error message. */
4433 register tree decl = declarator;
4437 switch (TREE_CODE (decl))
4442 innermost_code = TREE_CODE (decl);
4443 decl = TREE_OPERAND (decl, 0);
4446 case IDENTIFIER_NODE:
4447 name = IDENTIFIER_POINTER (decl);
4458 /* A function definition's declarator must have the form of
4459 a function declarator. */
4461 if (funcdef_flag && innermost_code != CALL_EXPR)
4464 /* Anything declared one level down from the top level
4465 must be one of the parameters of a function
4466 (because the body is at least two levels down). */
4468 /* If this looks like a function definition, make it one,
4469 even if it occurs where parms are expected.
4470 Then store_parm_decls will reject it and not use it as a parm. */
4471 if (decl_context == NORMAL && !funcdef_flag
4472 && current_binding_level->parm_flag)
4473 decl_context = PARM;
4475 /* Look through the decl specs and record which ones appear.
4476 Some typespecs are defined as built-in typenames.
4477 Others, the ones that are modifiers of other types,
4478 are represented by bits in SPECBITS: set the bits for
4479 the modifiers that appear. Storage class keywords are also in SPECBITS.
4481 If there is a typedef name or a type, store the type in TYPE.
4482 This includes builtin typedefs such as `int'.
4484 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4485 and did not come from a user typedef.
4487 Set LONGLONG if `long' is mentioned twice. */
4489 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4492 register tree id = TREE_VALUE (spec);
4494 if (id == ridpointers[(int) RID_INT])
4496 if (id == ridpointers[(int) RID_CHAR])
4499 if (TREE_CODE (id) == IDENTIFIER_NODE)
4500 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4502 if (ridpointers[i] == id)
4504 if (i == (int) RID_LONG && specbits & (1<<i))
4507 error ("`long long long' is too long for GCC");
4510 if (pedantic && ! in_system_header && warn_long_long)
4511 pedwarn ("ANSI C does not support `long long'");
4515 else if (specbits & (1 << i))
4516 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4522 error ("two or more data types in declaration of `%s'", name);
4523 /* Actual typedefs come to us as TYPE_DECL nodes. */
4524 else if (TREE_CODE (id) == TYPE_DECL)
4526 type = TREE_TYPE (id);
4527 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4530 /* Built-in types come as identifiers. */
4531 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4533 register tree t = lookup_name (id);
4534 if (TREE_TYPE (t) == error_mark_node)
4536 else if (!t || TREE_CODE (t) != TYPE_DECL)
4537 error ("`%s' fails to be a typedef or built in type",
4538 IDENTIFIER_POINTER (id));
4541 type = TREE_TYPE (t);
4545 else if (TREE_CODE (id) != ERROR_MARK)
4551 typedef_type = type;
4553 size_varies = C_TYPE_VARIABLE_SIZE (type);
4555 /* No type at all: default to `int', and set DEFAULTED_INT
4556 because it was not a user-defined typedef. */
4560 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4561 | (1 << (int) RID_SIGNED)
4562 | (1 << (int) RID_UNSIGNED))))
4563 /* Don't warn about typedef foo = bar. */
4564 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4565 && ! (in_system_header && ! allocation_temporary_p ()))
4567 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4568 and this is a function, or if -Wimplicit; prefer the former
4569 warning since it is more explicit. */
4570 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4571 warn_about_return_type = 1;
4572 else if (warn_implicit_int || flag_isoc9x)
4573 warning ("type defaults to `int' in declaration of `%s'", name);
4577 type = integer_type_node;
4580 /* Now process the modifiers that were specified
4581 and check for invalid combinations. */
4583 /* Long double is a special combination. */
4585 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4586 && TYPE_MAIN_VARIANT (type) == double_type_node)
4588 specbits &= ~ (1 << (int) RID_LONG);
4589 type = long_double_type_node;
4592 /* Check all other uses of type modifiers. */
4594 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4595 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4599 if ((specbits & 1 << (int) RID_LONG)
4600 && (specbits & 1 << (int) RID_SHORT))
4601 error ("both long and short specified for `%s'", name);
4602 else if (((specbits & 1 << (int) RID_LONG)
4603 || (specbits & 1 << (int) RID_SHORT))
4605 error ("long or short specified with char for `%s'", name);
4606 else if (((specbits & 1 << (int) RID_LONG)
4607 || (specbits & 1 << (int) RID_SHORT))
4608 && TREE_CODE (type) == REAL_TYPE)
4610 static int already = 0;
4612 error ("long or short specified with floating type for `%s'", name);
4613 if (! already && ! pedantic)
4615 error ("the only valid combination is `long double'");
4619 else if ((specbits & 1 << (int) RID_SIGNED)
4620 && (specbits & 1 << (int) RID_UNSIGNED))
4621 error ("both signed and unsigned specified for `%s'", name);
4622 else if (TREE_CODE (type) != INTEGER_TYPE)
4623 error ("long, short, signed or unsigned invalid for `%s'", name);
4627 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4629 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4631 if (flag_pedantic_errors)
4636 /* Discard the type modifiers if they are invalid. */
4639 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4640 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4645 if ((specbits & (1 << (int) RID_COMPLEX))
4646 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4648 error ("complex invalid for `%s'", name);
4649 specbits &= ~ (1 << (int) RID_COMPLEX);
4652 /* Decide whether an integer type is signed or not.
4653 Optionally treat bitfields as signed by default. */
4654 if (specbits & 1 << (int) RID_UNSIGNED
4655 /* Traditionally, all bitfields are unsigned. */
4656 || (bitfield && flag_traditional
4657 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4658 || (bitfield && ! flag_signed_bitfields
4659 && (explicit_int || defaulted_int || explicit_char
4660 /* A typedef for plain `int' without `signed'
4661 can be controlled just like plain `int'. */
4662 || ! (typedef_decl != 0
4663 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4664 && TREE_CODE (type) != ENUMERAL_TYPE
4665 && !(specbits & 1 << (int) RID_SIGNED)))
4668 type = long_long_unsigned_type_node;
4669 else if (specbits & 1 << (int) RID_LONG)
4670 type = long_unsigned_type_node;
4671 else if (specbits & 1 << (int) RID_SHORT)
4672 type = short_unsigned_type_node;
4673 else if (type == char_type_node)
4674 type = unsigned_char_type_node;
4675 else if (typedef_decl)
4676 type = unsigned_type (type);
4678 type = unsigned_type_node;
4680 else if ((specbits & 1 << (int) RID_SIGNED)
4681 && type == char_type_node)
4682 type = signed_char_type_node;
4684 type = long_long_integer_type_node;
4685 else if (specbits & 1 << (int) RID_LONG)
4686 type = long_integer_type_node;
4687 else if (specbits & 1 << (int) RID_SHORT)
4688 type = short_integer_type_node;
4690 if (specbits & 1 << (int) RID_COMPLEX)
4692 /* If we just have "complex", it is equivalent to
4693 "complex double", but if any modifiers at all are specified it is
4694 the complex form of TYPE. E.g, "complex short" is
4695 "complex short int". */
4697 if (defaulted_int && ! longlong
4698 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4699 | (1 << (int) RID_SIGNED)
4700 | (1 << (int) RID_UNSIGNED))))
4701 type = complex_double_type_node;
4702 else if (type == integer_type_node)
4703 type = complex_integer_type_node;
4704 else if (type == float_type_node)
4705 type = complex_float_type_node;
4706 else if (type == double_type_node)
4707 type = complex_double_type_node;
4708 else if (type == long_double_type_node)
4709 type = complex_long_double_type_node;
4711 type = build_complex_type (type);
4714 /* Figure out the type qualifiers for the declaration. There are
4715 two ways a declaration can become qualified. One is something
4716 like `const int i' where the `const' is explicit. Another is
4717 something like `typedef const int CI; CI i' where the type of the
4718 declaration contains the `const'. */
4719 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4720 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4721 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4722 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4724 pedwarn ("duplicate `const'");
4726 pedwarn ("duplicate `restrict'");
4728 pedwarn ("duplicate `volatile'");
4729 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4730 type = TYPE_MAIN_VARIANT (type);
4731 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4732 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4733 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4735 /* Warn if two storage classes are given. Default to `auto'. */
4740 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4741 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4742 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4743 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4744 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4745 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4747 /* Warn about storage classes that are invalid for certain
4748 kinds of declarations (parameters, typenames, etc.). */
4751 error ("multiple storage classes in declaration of `%s'", name);
4752 else if (funcdef_flag
4754 & ((1 << (int) RID_REGISTER)
4755 | (1 << (int) RID_AUTO)
4756 | (1 << (int) RID_TYPEDEF))))
4758 if (specbits & 1 << (int) RID_AUTO
4759 && (pedantic || current_binding_level == global_binding_level))
4760 pedwarn ("function definition declared `auto'");
4761 if (specbits & 1 << (int) RID_REGISTER)
4762 error ("function definition declared `register'");
4763 if (specbits & 1 << (int) RID_TYPEDEF)
4764 error ("function definition declared `typedef'");
4765 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4766 | (1 << (int) RID_AUTO));
4768 else if (decl_context != NORMAL && nclasses > 0)
4770 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4774 error ((decl_context == FIELD
4775 ? "storage class specified for structure field `%s'"
4776 : (decl_context == PARM
4777 ? "storage class specified for parameter `%s'"
4778 : "storage class specified for typename")),
4780 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4781 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4782 | (1 << (int) RID_EXTERN));
4785 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4787 /* `extern' with initialization is invalid if not at top level. */
4788 if (current_binding_level == global_binding_level)
4789 warning ("`%s' initialized and declared `extern'", name);
4791 error ("`%s' has both `extern' and initializer", name);
4793 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4794 && current_binding_level != global_binding_level)
4795 error ("nested function `%s' declared `extern'", name);
4796 else if (current_binding_level == global_binding_level
4797 && specbits & (1 << (int) RID_AUTO))
4798 error ("top-level declaration of `%s' specifies `auto'", name);
4799 else if ((specbits & 1 << (int) RID_ITERATOR)
4800 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4802 error ("iterator `%s' has derived type", name);
4803 type = error_mark_node;
4805 else if ((specbits & 1 << (int) RID_ITERATOR)
4806 && TREE_CODE (type) != INTEGER_TYPE)
4808 error ("iterator `%s' has noninteger type", name);
4809 type = error_mark_node;
4813 /* Now figure out the structure of the declarator proper.
4814 Descend through it, creating more complex types, until we reach
4815 the declared identifier (or NULL_TREE, in an absolute declarator). */
4817 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4819 if (type == error_mark_node)
4821 declarator = TREE_OPERAND (declarator, 0);
4825 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4826 an INDIRECT_REF (for *...),
4827 a CALL_EXPR (for ...(...)),
4828 an identifier (for the name being declared)
4829 or a null pointer (for the place in an absolute declarator
4830 where the name was omitted).
4831 For the last two cases, we have just exited the loop.
4833 At this point, TYPE is the type of elements of an array,
4834 or for a function to return, or for a pointer to point to.
4835 After this sequence of ifs, TYPE is the type of the
4836 array or function or pointer, and DECLARATOR has had its
4837 outermost layer removed. */
4839 if (TREE_CODE (declarator) == ARRAY_REF)
4841 register tree itype = NULL_TREE;
4842 register tree size = TREE_OPERAND (declarator, 1);
4843 /* An uninitialized decl with `extern' is a reference. */
4844 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4845 /* The index is a signed object `sizetype' bits wide. */
4846 tree index_type = signed_type (sizetype);
4848 declarator = TREE_OPERAND (declarator, 0);
4850 /* Check for some types that there cannot be arrays of. */
4852 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4854 error ("declaration of `%s' as array of voids", name);
4855 type = error_mark_node;
4858 if (TREE_CODE (type) == FUNCTION_TYPE)
4860 error ("declaration of `%s' as array of functions", name);
4861 type = error_mark_node;
4864 if (size == error_mark_node)
4865 type = error_mark_node;
4867 if (type == error_mark_node)
4870 /* If this is a block level extern, it must live past the end
4871 of the function so that we can check it against other extern
4872 declarations (IDENTIFIER_LIMBO_VALUE). */
4873 if (extern_ref && allocation_temporary_p ())
4874 end_temporary_allocation ();
4876 /* If size was specified, set ITYPE to a range-type for that size.
4877 Otherwise, ITYPE remains null. finish_decl may figure it out
4878 from an initial value. */
4882 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4883 STRIP_TYPE_NOPS (size);
4885 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4886 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4888 error ("size of array `%s' has non-integer type", name);
4889 size = integer_one_node;
4892 if (pedantic && integer_zerop (size))
4893 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4895 if (TREE_CODE (size) == INTEGER_CST)
4897 constant_expression_warning (size);
4898 if (tree_int_cst_sgn (size) < 0)
4900 error ("size of array `%s' is negative", name);
4901 size = integer_one_node;
4906 /* Make sure the array size remains visibly nonconstant
4907 even if it is (eg) a const variable with known value. */
4912 if (TREE_CONSTANT (size))
4913 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4915 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4919 /* Convert size to index_type, so that if it is a variable
4920 the computations will be done in the proper mode. */
4921 itype = fold (build (MINUS_EXPR, index_type,
4922 convert (index_type, size),
4923 convert (index_type, size_one_node)));
4925 /* If that overflowed, the array is too big.
4926 ??? While a size of INT_MAX+1 technically shouldn't cause
4927 an overflow (because we subtract 1), the overflow is recorded
4928 during the conversion to index_type, before the subtraction.
4929 Handling this case seems like an unnecessary complication. */
4930 if (TREE_OVERFLOW (itype))
4932 error ("size of array `%s' is too large", name);
4933 type = error_mark_node;
4938 itype = variable_size (itype);
4939 itype = build_index_type (itype);
4942 #if 0 /* This had bad results for pointers to arrays, as in
4943 union incomplete (*foo)[4]; */
4944 /* Complain about arrays of incomplete types, except in typedefs. */
4946 if (TYPE_SIZE (type) == 0
4947 /* Avoid multiple warnings for nested array types. */
4948 && TREE_CODE (type) != ARRAY_TYPE
4949 && !(specbits & (1 << (int) RID_TYPEDEF))
4950 && !C_TYPE_BEING_DEFINED (type))
4951 warning ("array type has incomplete element type");
4954 #if 0 /* We shouldn't have a function type here at all!
4955 Functions aren't allowed as array elements. */
4956 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4957 && (constp || volatilep))
4958 pedwarn ("ANSI C forbids const or volatile function types");
4961 /* Build the array type itself, then merge any constancy or
4962 volatility into the target type. We must do it in this order
4963 to ensure that the TYPE_MAIN_VARIANT field of the array type
4964 is set correctly. */
4966 type = build_array_type (type, itype);
4968 type = c_build_qualified_type (type, type_quals);
4970 #if 0 /* don't clear these; leave them set so that the array type
4971 or the variable is itself const or volatile. */
4972 type_quals = TYPE_UNQUALIFIED;
4976 C_TYPE_VARIABLE_SIZE (type) = 1;
4978 else if (TREE_CODE (declarator) == CALL_EXPR)
4980 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4981 || current_binding_level == global_binding_level);
4984 /* Declaring a function type.
4985 Make sure we have a valid type for the function to return. */
4986 if (type == error_mark_node)
4991 /* Warn about some types functions can't return. */
4993 if (TREE_CODE (type) == FUNCTION_TYPE)
4995 error ("`%s' declared as function returning a function", name);
4996 type = integer_type_node;
4998 if (TREE_CODE (type) == ARRAY_TYPE)
5000 error ("`%s' declared as function returning an array", name);
5001 type = integer_type_node;
5004 #ifndef TRADITIONAL_RETURN_FLOAT
5005 /* Traditionally, declaring return type float means double. */
5007 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
5008 type = double_type_node;
5009 #endif /* TRADITIONAL_RETURN_FLOAT */
5011 /* If this is a block level extern, it must live past the end
5012 of the function so that we can check it against other extern
5013 declarations (IDENTIFIER_LIMBO_VALUE). */
5014 if (extern_ref && allocation_temporary_p ())
5015 end_temporary_allocation ();
5017 /* Construct the function type and go to the next
5018 inner layer of declarator. */
5020 arg_types = grokparms (TREE_OPERAND (declarator, 1),
5022 /* Say it's a definition
5023 only for the CALL_EXPR
5024 closest to the identifier. */
5025 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
5026 #if 0 /* This seems to be false. We turn off temporary allocation
5027 above in this function if -traditional.
5028 And this code caused inconsistent results with prototypes:
5029 callers would ignore them, and pass arguments wrong. */
5031 /* Omit the arg types if -traditional, since the arg types
5032 and the list links might not be permanent. */
5033 type = build_function_type (type,
5035 ? NULL_TREE : arg_types);
5037 /* Type qualifiers before the return type of the function
5038 qualify the return type, not the function type. */
5040 type = c_build_qualified_type (type, type_quals);
5041 type_quals = TYPE_UNQUALIFIED;
5043 type = build_function_type (type, arg_types);
5044 declarator = TREE_OPERAND (declarator, 0);
5046 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5047 the formal parameter list of this FUNCTION_TYPE to point to
5048 the FUNCTION_TYPE node itself. */
5053 for (link = last_function_parm_tags;
5055 link = TREE_CHAIN (link))
5056 TYPE_CONTEXT (TREE_VALUE (link)) = type;
5059 else if (TREE_CODE (declarator) == INDIRECT_REF)
5061 /* Merge any constancy or volatility into the target type
5064 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5066 pedwarn ("ANSI C forbids qualified function types");
5068 type = c_build_qualified_type (type, type_quals);
5069 type_quals = TYPE_UNQUALIFIED;
5072 type = build_pointer_type (type);
5074 /* Process a list of type modifier keywords
5075 (such as const or volatile) that were given inside the `*'. */
5077 if (TREE_TYPE (declarator))
5079 register tree typemodlist;
5085 for (typemodlist = TREE_TYPE (declarator); typemodlist;
5086 typemodlist = TREE_CHAIN (typemodlist))
5088 tree qualifier = TREE_VALUE (typemodlist);
5090 if (qualifier == ridpointers[(int) RID_CONST])
5092 else if (qualifier == ridpointers[(int) RID_VOLATILE])
5094 else if (qualifier == ridpointers[(int) RID_RESTRICT])
5099 error ("invalid type modifier within pointer declarator");
5103 pedwarn ("duplicate `const'");
5105 pedwarn ("duplicate `volatile'");
5107 pedwarn ("duplicate `restrict'");
5109 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5110 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5111 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
5114 declarator = TREE_OPERAND (declarator, 0);
5121 /* Now TYPE has the actual type. */
5123 /* Did array size calculations overflow? */
5125 if (TREE_CODE (type) == ARRAY_TYPE
5127 && TREE_OVERFLOW (TYPE_SIZE (type)))
5128 error ("size of array `%s' is too large", name);
5130 /* If this is declaring a typedef name, return a TYPE_DECL. */
5132 if (specbits & (1 << (int) RID_TYPEDEF))
5135 /* Note that the grammar rejects storage classes
5136 in typenames, fields or parameters */
5137 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5139 pedwarn ("ANSI C forbids qualified function types");
5141 type = c_build_qualified_type (type, type_quals);
5142 decl = build_decl (TYPE_DECL, declarator, type);
5143 if ((specbits & (1 << (int) RID_SIGNED))
5144 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5145 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5150 /* Detect the case of an array type of unspecified size
5151 which came, as such, direct from a typedef name.
5152 We must copy the type, so that each identifier gets
5153 a distinct type, so that each identifier's size can be
5154 controlled separately by its own initializer. */
5156 if (type != 0 && typedef_type != 0
5157 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5158 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5160 type = build_array_type (TREE_TYPE (type), 0);
5162 C_TYPE_VARIABLE_SIZE (type) = 1;
5165 /* If this is a type name (such as, in a cast or sizeof),
5166 compute the type and return it now. */
5168 if (decl_context == TYPENAME)
5170 /* Note that the grammar rejects storage classes
5171 in typenames, fields or parameters */
5172 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5174 pedwarn ("ANSI C forbids const or volatile function types");
5176 type = c_build_qualified_type (type, type_quals);
5181 /* Aside from typedefs and type names (handle above),
5182 `void' at top level (not within pointer)
5183 is allowed only in public variables.
5184 We don't complain about parms either, but that is because
5185 a better error message can be made later. */
5187 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5188 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5189 && ((specbits & (1 << (int) RID_EXTERN))
5190 || (current_binding_level == global_binding_level
5192 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5194 error ("variable or field `%s' declared void", name);
5195 type = integer_type_node;
5198 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5199 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5204 if (decl_context == PARM)
5206 tree type_as_written = type;
5209 /* A parameter declared as an array of T is really a pointer to T.
5210 One declared as a function is really a pointer to a function. */
5212 if (TREE_CODE (type) == ARRAY_TYPE)
5214 /* Transfer const-ness of array into that of type pointed to. */
5215 type = TREE_TYPE (type);
5217 type = c_build_qualified_type (type, type_quals);
5218 type = build_pointer_type (type);
5219 type_quals = TYPE_UNQUALIFIED;
5222 else if (TREE_CODE (type) == FUNCTION_TYPE)
5224 if (pedantic && type_quals)
5225 pedwarn ("ANSI C forbids qualified function types");
5227 type = c_build_qualified_type (type, type_quals);
5228 type = build_pointer_type (type);
5229 type_quals = TYPE_UNQUALIFIED;
5232 decl = build_decl (PARM_DECL, declarator, type);
5234 C_DECL_VARIABLE_SIZE (decl) = 1;
5236 /* Compute the type actually passed in the parmlist,
5237 for the case where there is no prototype.
5238 (For example, shorts and chars are passed as ints.)
5239 When there is a prototype, this is overridden later. */
5241 DECL_ARG_TYPE (decl) = type;
5242 main_type = (type == error_mark_node
5244 : TYPE_MAIN_VARIANT (type));
5245 if (main_type == float_type_node)
5246 DECL_ARG_TYPE (decl) = double_type_node;
5247 /* Don't use TYPE_PRECISION to decide whether to promote,
5248 because we should convert short if it's the same size as int,
5249 but we should not convert long if it's the same size as int. */
5250 else if (TREE_CODE (main_type) != ERROR_MARK
5251 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5253 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5254 && TREE_UNSIGNED (type))
5255 DECL_ARG_TYPE (decl) = unsigned_type_node;
5257 DECL_ARG_TYPE (decl) = integer_type_node;
5260 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5262 else if (decl_context == FIELD)
5264 /* Structure field. It may not be a function. */
5266 if (TREE_CODE (type) == FUNCTION_TYPE)
5268 error ("field `%s' declared as a function", name);
5269 type = build_pointer_type (type);
5271 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5273 error ("field `%s' has incomplete type", name);
5274 type = error_mark_node;
5276 /* Move type qualifiers down to element of an array. */
5277 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5279 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5281 TYPE_DOMAIN (type));
5282 #if 0 /* Leave the field const or volatile as well. */
5283 type_quals = TYPE_UNQUALIFIED;
5286 decl = build_decl (FIELD_DECL, declarator, type);
5288 C_DECL_VARIABLE_SIZE (decl) = 1;
5290 else if (TREE_CODE (type) == FUNCTION_TYPE)
5292 /* Every function declaration is "external"
5293 except for those which are inside a function body
5294 in which `auto' is used.
5295 That is a case not specified by ANSI C,
5296 and we use it for forward declarations for nested functions. */
5297 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5298 || current_binding_level == global_binding_level);
5300 if (specbits & (1 << (int) RID_AUTO)
5301 && (pedantic || current_binding_level == global_binding_level))
5302 pedwarn ("invalid storage class for function `%s'", name);
5303 if (specbits & (1 << (int) RID_REGISTER))
5304 error ("invalid storage class for function `%s'", name);
5305 /* Function declaration not at top level.
5306 Storage classes other than `extern' are not allowed
5307 and `extern' makes no difference. */
5308 if (current_binding_level != global_binding_level
5309 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5311 pedwarn ("invalid storage class for function `%s'", name);
5313 /* If this is a block level extern, it must live past the end
5314 of the function so that we can check it against other
5315 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5316 if (extern_ref && allocation_temporary_p ())
5317 end_temporary_allocation ();
5319 decl = build_decl (FUNCTION_DECL, declarator, type);
5320 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5322 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
5323 pedwarn ("ANSI C forbids qualified function types");
5326 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5327 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
5328 && ! DECL_IN_SYSTEM_HEADER (decl))
5329 pedwarn ("ANSI C forbids qualified void function return type");
5331 /* GNU C interprets a `volatile void' return type to indicate
5332 that the function does not return. */
5333 if ((type_quals & TYPE_QUAL_VOLATILE)
5334 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5335 warning ("`noreturn' function returns non-void value");
5338 DECL_EXTERNAL (decl) = 1;
5339 /* Record absence of global scope for `static' or `auto'. */
5341 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5343 /* Record presence of `inline', if it is reasonable. */
5346 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5347 warning ("cannot inline function `main'");
5349 /* Assume that otherwise the function can be inlined. */
5350 DECL_INLINE (decl) = 1;
5352 if (specbits & (1 << (int) RID_EXTERN))
5353 current_extern_inline = 1;
5358 /* It's a variable. */
5359 /* An uninitialized decl with `extern' is a reference. */
5360 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5362 /* Move type qualifiers down to element of an array. */
5363 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5365 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5367 TYPE_DOMAIN (type));
5368 #if 0 /* Leave the variable const or volatile as well. */
5369 type_quals = TYPE_UNQUALIFIED;
5373 /* If this is a block level extern, it must live past the end
5374 of the function so that we can check it against other
5375 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5376 if (extern_ref && allocation_temporary_p ())
5377 end_temporary_allocation ();
5379 decl = build_decl (VAR_DECL, declarator, type);
5381 C_DECL_VARIABLE_SIZE (decl) = 1;
5384 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5386 DECL_EXTERNAL (decl) = extern_ref;
5387 /* At top level, the presence of a `static' or `register' storage
5388 class specifier, or the absence of all storage class specifiers
5389 makes this declaration a definition (perhaps tentative). Also,
5390 the absence of both `static' and `register' makes it public. */
5391 if (current_binding_level == global_binding_level)
5395 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5396 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5398 /* Not at top level, only `static' makes a static definition. */
5401 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5402 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5405 if (specbits & 1 << (int) RID_ITERATOR)
5406 ITERATOR_P (decl) = 1;
5409 /* Record `register' declaration for warnings on &
5410 and in case doing stupid register allocation. */
5412 if (specbits & (1 << (int) RID_REGISTER))
5413 DECL_REGISTER (decl) = 1;
5415 /* Record constancy and volatility. */
5416 c_apply_type_quals_to_decl (type_quals, decl);
5418 /* If a type has volatile components, it should be stored in memory.
5419 Otherwise, the fact that those components are volatile
5420 will be ignored, and would even crash the compiler. */
5421 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5422 mark_addressable (decl);
5430 /* Decode the parameter-list info for a function type or function definition.
5431 The argument is the value returned by `get_parm_info' (or made in parse.y
5432 if there is an identifier list instead of a parameter decl list).
5433 These two functions are separate because when a function returns
5434 or receives functions then each is called multiple times but the order
5435 of calls is different. The last call to `grokparms' is always the one
5436 that contains the formal parameter names of a function definition.
5438 Store in `last_function_parms' a chain of the decls of parms.
5439 Also store in `last_function_parm_tags' a chain of the struct, union,
5440 and enum tags declared among the parms.
5442 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5444 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5445 a mere declaration. A nonempty identifier-list gets an error message
5446 when FUNCDEF_FLAG is zero. */
5449 grokparms (parms_info, funcdef_flag)
5453 tree first_parm = TREE_CHAIN (parms_info);
5455 last_function_parms = TREE_PURPOSE (parms_info);
5456 last_function_parm_tags = TREE_VALUE (parms_info);
5458 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5459 && !in_system_header)
5460 warning ("function declaration isn't a prototype");
5463 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5466 pedwarn ("parameter names (without types) in function declaration");
5468 last_function_parms = first_parm;
5475 /* We no longer test FUNCDEF_FLAG.
5476 If the arg types are incomplete in a declaration,
5477 they must include undefined tags.
5478 These tags can never be defined in the scope of the declaration,
5479 so the types can never be completed,
5480 and no call can be compiled successfully. */
5482 /* In a fcn definition, arg types must be complete. */
5485 for (parm = last_function_parms, typelt = first_parm;
5487 parm = TREE_CHAIN (parm))
5488 /* Skip over any enumeration constants declared here. */
5489 if (TREE_CODE (parm) == PARM_DECL)
5491 /* Barf if the parameter itself has an incomplete type. */
5492 tree type = TREE_VALUE (typelt);
5493 if (TYPE_SIZE (type) == 0)
5495 if (funcdef_flag && DECL_NAME (parm) != 0)
5496 error ("parameter `%s' has incomplete type",
5497 IDENTIFIER_POINTER (DECL_NAME (parm)));
5499 warning ("parameter has incomplete type");
5502 TREE_VALUE (typelt) = error_mark_node;
5503 TREE_TYPE (parm) = error_mark_node;
5506 #if 0 /* This has been replaced by parm_tags_warning
5507 which uses a more accurate criterion for what to warn about. */
5510 /* Now warn if is a pointer to an incomplete type. */
5511 while (TREE_CODE (type) == POINTER_TYPE
5512 || TREE_CODE (type) == REFERENCE_TYPE)
5513 type = TREE_TYPE (type);
5514 type = TYPE_MAIN_VARIANT (type);
5515 if (TYPE_SIZE (type) == 0)
5517 if (DECL_NAME (parm) != 0)
5518 warning ("parameter `%s' points to incomplete type",
5519 IDENTIFIER_POINTER (DECL_NAME (parm)));
5521 warning ("parameter points to incomplete type");
5525 typelt = TREE_CHAIN (typelt);
5528 /* Allocate the list of types the way we allocate a type. */
5529 if (first_parm && ! TREE_PERMANENT (first_parm))
5531 /* Construct a copy of the list of types
5532 on the saveable obstack. */
5534 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5535 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5537 return nreverse (result);
5540 /* The list we have is permanent already. */
5546 /* Return a tree_list node with info on a parameter list just parsed.
5547 The TREE_PURPOSE is a chain of decls of those parms.
5548 The TREE_VALUE is a list of structure, union and enum tags defined.
5549 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5550 This tree_list node is later fed to `grokparms'.
5552 VOID_AT_END nonzero means append `void' to the end of the type-list.
5553 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5556 get_parm_info (void_at_end)
5559 register tree decl, t;
5560 register tree types = 0;
5562 tree tags = gettags ();
5563 tree parms = getdecls ();
5565 tree order = current_binding_level->parm_order;
5567 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5568 if (void_at_end && parms != 0
5569 && TREE_CHAIN (parms) == 0
5570 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5571 && DECL_NAME (parms) == 0)
5574 storedecls (NULL_TREE);
5575 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5576 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5579 /* Extract enumerator values and other non-parms declared with the parms.
5580 Likewise any forward parm decls that didn't have real parm decls. */
5581 for (decl = parms; decl; )
5583 tree next = TREE_CHAIN (decl);
5585 if (TREE_CODE (decl) != PARM_DECL)
5587 TREE_CHAIN (decl) = new_parms;
5590 else if (TREE_ASM_WRITTEN (decl))
5592 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5593 TREE_CHAIN (decl) = new_parms;
5599 /* Put the parm decls back in the order they were in in the parm list. */
5600 for (t = order; t; t = TREE_CHAIN (t))
5603 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5605 TREE_CHAIN (TREE_VALUE (t)) = 0;
5608 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5611 /* Store the parmlist in the binding level since the old one
5612 is no longer a valid list. (We have changed the chain pointers.) */
5613 storedecls (new_parms);
5615 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5616 /* There may also be declarations for enumerators if an enumeration
5617 type is declared among the parms. Ignore them here. */
5618 if (TREE_CODE (decl) == PARM_DECL)
5620 /* Since there is a prototype,
5621 args are passed in their declared types. */
5622 tree type = TREE_TYPE (decl);
5623 DECL_ARG_TYPE (decl) = type;
5624 #ifdef PROMOTE_PROTOTYPES
5625 if ((TREE_CODE (type) == INTEGER_TYPE
5626 || TREE_CODE (type) == ENUMERAL_TYPE)
5627 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5628 DECL_ARG_TYPE (decl) = integer_type_node;
5631 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5632 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5633 && DECL_NAME (decl) == 0)
5635 error ("`void' in parameter list must be the entire list");
5641 return saveable_tree_cons (new_parms, tags,
5642 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5644 return saveable_tree_cons (new_parms, tags, nreverse (types));
5647 /* At end of parameter list, warn about any struct, union or enum tags
5648 defined within. Do so because these types cannot ever become complete. */
5651 parmlist_tags_warning ()
5656 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5658 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5659 /* An anonymous union parm type is meaningful as a GNU extension.
5660 So don't warn for that. */
5661 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5663 if (TREE_PURPOSE (elt) != 0)
5664 warning ("`%s %s' declared inside parameter list",
5665 (code == RECORD_TYPE ? "struct"
5666 : code == UNION_TYPE ? "union"
5668 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5670 warning ("anonymous %s declared inside parameter list",
5671 (code == RECORD_TYPE ? "struct"
5672 : code == UNION_TYPE ? "union"
5677 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5683 /* Get the struct, enum or union (CODE says which) with tag NAME.
5684 Define the tag as a forward-reference if it is not defined. */
5687 xref_tag (code, name)
5688 enum tree_code code;
5691 int temporary = allocation_temporary_p ();
5693 /* If a cross reference is requested, look up the type
5694 already defined for this tag and return it. */
5696 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5697 /* Even if this is the wrong type of tag, return what we found.
5698 There will be an error message anyway, from pending_xref_error.
5699 If we create an empty xref just for an invalid use of the type,
5700 the main result is to create lots of superfluous error messages. */
5704 push_obstacks_nochange ();
5706 if (current_binding_level == global_binding_level && temporary)
5707 end_temporary_allocation ();
5709 /* If no such tag is yet defined, create a forward-reference node
5710 and record it as the "definition".
5711 When a real declaration of this type is found,
5712 the forward-reference will be altered into a real type. */
5714 ref = make_node (code);
5715 if (code == ENUMERAL_TYPE)
5717 /* (In ANSI, Enums can be referred to only if already defined.) */
5719 pedwarn ("ANSI C forbids forward references to `enum' types");
5720 /* Give the type a default layout like unsigned int
5721 to avoid crashing if it does not get defined. */
5722 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5723 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5724 TREE_UNSIGNED (ref) = 1;
5725 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5726 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5727 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5730 pushtag (name, ref);
5737 /* Make sure that the tag NAME is defined *in the current binding level*
5738 at least as a forward reference.
5739 CODE says which kind of tag NAME ought to be.
5741 We also do a push_obstacks_nochange
5742 whose matching pop is in finish_struct. */
5745 start_struct (code, name)
5746 enum tree_code code;
5749 /* If there is already a tag defined at this binding level
5750 (as a forward reference), just return it. */
5752 register tree ref = 0;
5754 push_obstacks_nochange ();
5755 if (current_binding_level == global_binding_level)
5756 end_temporary_allocation ();
5759 ref = lookup_tag (code, name, current_binding_level, 1);
5760 if (ref && TREE_CODE (ref) == code)
5762 C_TYPE_BEING_DEFINED (ref) = 1;
5763 TYPE_PACKED (ref) = flag_pack_struct;
5764 if (TYPE_FIELDS (ref))
5765 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5766 : "redefinition of `struct %s'"),
5767 IDENTIFIER_POINTER (name));
5772 /* Otherwise create a forward-reference just so the tag is in scope. */
5774 ref = make_node (code);
5775 pushtag (name, ref);
5776 C_TYPE_BEING_DEFINED (ref) = 1;
5777 TYPE_PACKED (ref) = flag_pack_struct;
5781 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5782 of a structure component, returning a FIELD_DECL node.
5783 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5785 This is done during the parsing of the struct declaration.
5786 The FIELD_DECL nodes are chained together and the lot of them
5787 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5790 grokfield (filename, line, declarator, declspecs, width)
5791 const char *filename ATTRIBUTE_UNUSED;
5792 int line ATTRIBUTE_UNUSED;
5793 tree declarator, declspecs, width;
5797 /* The corresponding pop_obstacks is in finish_decl. */
5798 push_obstacks_nochange ();
5800 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5802 finish_decl (value, NULL_TREE, NULL_TREE);
5803 DECL_INITIAL (value) = width;
5805 maybe_objc_check_decl (value);
5809 /* Function to help qsort sort FIELD_DECLs by name order. */
5812 field_decl_cmp (xp, yp)
5813 const GENERIC_PTR xp;
5814 const GENERIC_PTR yp;
5816 tree *x = (tree *)xp, *y = (tree *)yp;
5818 if (DECL_NAME (*x) == DECL_NAME (*y))
5820 if (DECL_NAME (*x) == NULL)
5822 if (DECL_NAME (*y) == NULL)
5824 if (DECL_NAME (*x) < DECL_NAME (*y))
5829 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5830 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5831 ATTRIBUTES are attributes to be applied to the structure.
5833 We also do a pop_obstacks to match the push in start_struct. */
5836 finish_struct (t, fieldlist, attributes)
5843 int toplevel = global_binding_level == current_binding_level;
5845 /* If this type was previously laid out as a forward reference,
5846 make sure we lay it out again. */
5850 decl_attributes (t, attributes, NULL_TREE);
5852 /* Nameless union parm types are useful as GCC extension. */
5853 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5854 /* Otherwise, warn about any struct or union def. in parmlist. */
5855 if (in_parm_level_p ())
5858 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5859 : "structure defined inside parms"));
5860 else if (! flag_traditional)
5861 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5862 : "structure defined inside parms"));
5865 old_momentary = suspend_momentary ();
5869 for (x = fieldlist; x; x = TREE_CHAIN (x))
5870 if (DECL_NAME (x) != 0)
5875 ? "%s has no named members"
5876 : "%s has no members"),
5877 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5880 /* Install struct as DECL_CONTEXT of each field decl.
5881 Also process specified field sizes.
5882 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5883 The specified size is found in the DECL_INITIAL.
5884 Store 0 there, except for ": 0" fields (so we can find them
5885 and delete them, below). */
5887 for (x = fieldlist; x; x = TREE_CHAIN (x))
5889 DECL_CONTEXT (x) = t;
5890 DECL_PACKED (x) |= TYPE_PACKED (t);
5891 DECL_FIELD_SIZE (x) = 0;
5893 /* If any field is const, the structure type is pseudo-const. */
5894 if (TREE_READONLY (x))
5895 C_TYPE_FIELDS_READONLY (t) = 1;
5898 /* A field that is pseudo-const makes the structure likewise. */
5899 tree t1 = TREE_TYPE (x);
5900 while (TREE_CODE (t1) == ARRAY_TYPE)
5901 t1 = TREE_TYPE (t1);
5902 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5903 && C_TYPE_FIELDS_READONLY (t1))
5904 C_TYPE_FIELDS_READONLY (t) = 1;
5907 /* Any field that is volatile means variables of this type must be
5908 treated in some ways as volatile. */
5909 if (TREE_THIS_VOLATILE (x))
5910 C_TYPE_FIELDS_VOLATILE (t) = 1;
5912 /* Any field of nominal variable size implies structure is too. */
5913 if (C_DECL_VARIABLE_SIZE (x))
5914 C_TYPE_VARIABLE_SIZE (t) = 1;
5916 /* Detect invalid nested redefinition. */
5917 if (TREE_TYPE (x) == t)
5918 error ("nested redefinition of `%s'",
5919 IDENTIFIER_POINTER (TYPE_NAME (t)));
5921 /* Detect invalid bit-field size. */
5922 if (DECL_INITIAL (x))
5923 STRIP_NOPS (DECL_INITIAL (x));
5924 if (DECL_INITIAL (x))
5926 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5927 constant_expression_warning (DECL_INITIAL (x));
5930 error_with_decl (x, "bit-field `%s' width not an integer constant");
5931 DECL_INITIAL (x) = NULL;
5935 /* Detect invalid bit-field type. */
5936 if (DECL_INITIAL (x)
5937 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5938 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5940 error_with_decl (x, "bit-field `%s' has invalid type");
5941 DECL_INITIAL (x) = NULL;
5943 if (DECL_INITIAL (x) && pedantic
5944 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5945 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5946 /* Accept an enum that's equivalent to int or unsigned int. */
5947 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5948 && (TYPE_PRECISION (TREE_TYPE (x))
5949 == TYPE_PRECISION (integer_type_node))))
5950 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5952 /* Detect and ignore out of range field width. */
5953 if (DECL_INITIAL (x))
5955 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5957 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5959 DECL_INITIAL (x) = NULL;
5960 error_with_decl (x, "negative width in bit-field `%s'");
5962 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5963 || width > TYPE_PRECISION (TREE_TYPE (x)))
5965 DECL_INITIAL (x) = NULL;
5966 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5968 else if (width == 0 && DECL_NAME (x) != 0)
5970 error_with_decl (x, "zero width for bit-field `%s'");
5971 DECL_INITIAL (x) = NULL;
5975 /* Process valid field width. */
5976 if (DECL_INITIAL (x))
5978 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5980 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5981 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5982 TREE_UNSIGNED (TREE_TYPE (x)))
5983 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5984 TREE_UNSIGNED (TREE_TYPE (x)))))
5985 warning_with_decl (x, "`%s' is narrower than values of its type");
5987 DECL_FIELD_SIZE (x) = width;
5988 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5989 DECL_INITIAL (x) = NULL;
5993 /* field size 0 => force desired amount of alignment. */
5994 #ifdef EMPTY_FIELD_BOUNDARY
5995 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5997 #ifdef PCC_BITFIELD_TYPE_MATTERS
5998 if (PCC_BITFIELD_TYPE_MATTERS)
5999 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
6000 TYPE_ALIGN (TREE_TYPE (x)));
6004 else if (TREE_TYPE (x) != error_mark_node)
6006 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
6007 : TYPE_ALIGN (TREE_TYPE (x)));
6008 /* Non-bit-fields are aligned for their type, except packed
6009 fields which require only BITS_PER_UNIT alignment. */
6010 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
6014 /* Now DECL_INITIAL is null on all members. */
6016 /* Delete all duplicate fields from the fieldlist */
6017 for (x = fieldlist; x && TREE_CHAIN (x);)
6018 /* Anonymous fields aren't duplicates. */
6019 if (DECL_NAME (TREE_CHAIN (x)) == 0)
6023 register tree y = fieldlist;
6027 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
6033 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
6035 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
6036 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
6038 else x = TREE_CHAIN (x);
6041 /* Now we have the nearly final fieldlist. Record it,
6042 then lay out the structure or union (including the fields). */
6044 TYPE_FIELDS (t) = fieldlist;
6048 /* Delete all zero-width bit-fields from the front of the fieldlist */
6050 && DECL_INITIAL (fieldlist))
6051 fieldlist = TREE_CHAIN (fieldlist);
6052 /* Delete all such members from the rest of the fieldlist */
6053 for (x = fieldlist; x;)
6055 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
6056 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
6057 else x = TREE_CHAIN (x);
6060 /* Now we have the truly final field list.
6061 Store it in this type and in the variants. */
6063 TYPE_FIELDS (t) = fieldlist;
6065 /* If there are lots of fields, sort so we can look through them fast.
6066 We arbitrarily consider 16 or more elts to be "a lot". */
6070 for (x = fieldlist; x; x = TREE_CHAIN (x))
6081 len += list_length (x);
6082 /* Use the same allocation policy here that make_node uses, to
6083 ensure that this lives as long as the rest of the struct decl.
6084 All decls in an inline function need to be saved. */
6085 if (allocation_temporary_p ())
6086 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
6088 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
6090 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
6091 TYPE_LANG_SPECIFIC (t)->len = len;
6093 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
6095 for (x = fieldlist; x; x = TREE_CHAIN (x))
6096 field_array[len++] = x;
6098 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6102 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6104 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6105 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6106 TYPE_ALIGN (x) = TYPE_ALIGN (t);
6109 /* If this was supposed to be a transparent union, but we can't
6110 make it one, warn and turn off the flag. */
6111 if (TREE_CODE (t) == UNION_TYPE
6112 && TYPE_TRANSPARENT_UNION (t)
6113 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
6115 TYPE_TRANSPARENT_UNION (t) = 0;
6116 warning ("union cannot be made transparent");
6119 /* If this structure or union completes the type of any previous
6120 variable declaration, lay it out and output its rtl. */
6122 if (current_binding_level->n_incomplete != 0)
6125 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
6127 if (TREE_TYPE (decl) == t
6128 && TREE_CODE (decl) != TYPE_DECL)
6130 layout_decl (decl, 0);
6131 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6132 maybe_objc_check_decl (decl);
6133 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6136 --current_binding_level->n_incomplete;
6138 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6139 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6141 tree element = TREE_TYPE (decl);
6142 while (TREE_CODE (element) == ARRAY_TYPE)
6143 element = TREE_TYPE (element);
6145 layout_array_type (TREE_TYPE (decl));
6150 resume_momentary (old_momentary);
6152 /* Finish debugging output for this type. */
6153 rest_of_type_compilation (t, toplevel);
6155 /* The matching push is in start_struct. */
6161 /* Lay out the type T, and its element type, and so on. */
6164 layout_array_type (t)
6167 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6168 layout_array_type (TREE_TYPE (t));
6172 /* Begin compiling the definition of an enumeration type.
6173 NAME is its name (or null if anonymous).
6174 Returns the type object, as yet incomplete.
6175 Also records info about it so that build_enumerator
6176 may be used to declare the individual values as they are read. */
6182 register tree enumtype = 0;
6184 /* If this is the real definition for a previous forward reference,
6185 fill in the contents in the same object that used to be the
6186 forward reference. */
6189 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6191 /* The corresponding pop_obstacks is in finish_enum. */
6192 push_obstacks_nochange ();
6193 /* If these symbols and types are global, make them permanent. */
6194 if (current_binding_level == global_binding_level)
6195 end_temporary_allocation ();
6197 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6199 enumtype = make_node (ENUMERAL_TYPE);
6200 pushtag (name, enumtype);
6203 C_TYPE_BEING_DEFINED (enumtype) = 1;
6205 if (TYPE_VALUES (enumtype) != 0)
6207 /* This enum is a named one that has been declared already. */
6208 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6210 /* Completely replace its old definition.
6211 The old enumerators remain defined, however. */
6212 TYPE_VALUES (enumtype) = 0;
6215 enum_next_value = integer_zero_node;
6218 if (flag_short_enums)
6219 TYPE_PACKED (enumtype) = 1;
6224 /* After processing and defining all the values of an enumeration type,
6225 install their decls in the enumeration type and finish it off.
6226 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6227 and ATTRIBUTES are the specified attributes.
6228 Returns ENUMTYPE. */
6231 finish_enum (enumtype, values, attributes)
6236 register tree pair, tem;
6237 tree minnode = 0, maxnode = 0;
6238 int lowprec, highprec, precision;
6239 int toplevel = global_binding_level == current_binding_level;
6241 if (in_parm_level_p ())
6242 warning ("enum defined inside parms");
6244 decl_attributes (enumtype, attributes, NULL_TREE);
6246 /* Calculate the maximum value of any enumerator in this type. */
6248 if (values == error_mark_node)
6249 minnode = maxnode = integer_zero_node;
6251 for (pair = values; pair; pair = TREE_CHAIN (pair))
6253 tree value = TREE_VALUE (pair);
6255 minnode = maxnode = TREE_VALUE (pair);
6258 if (tree_int_cst_lt (maxnode, value))
6260 if (tree_int_cst_lt (value, minnode))
6265 TYPE_MIN_VALUE (enumtype) = minnode;
6266 TYPE_MAX_VALUE (enumtype) = maxnode;
6268 /* An enum can have some negative values; then it is signed. */
6269 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6271 /* Determine the precision this type needs. */
6273 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6274 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6275 precision = MAX (lowprec, highprec);
6277 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6279 tree narrowest = type_for_size (precision, 1);
6282 warning ("enumeration values exceed range of largest integer");
6283 narrowest = long_long_integer_type_node;
6286 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6289 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6291 TYPE_SIZE (enumtype) = 0;
6292 layout_type (enumtype);
6294 if (values != error_mark_node)
6296 /* Change the type of the enumerators to be the enum type.
6297 Formerly this was done only for enums that fit in an int,
6298 but the comment said it was done only for enums wider than int.
6299 It seems necessary to do this for wide enums,
6300 and best not to change what's done for ordinary narrower ones. */
6301 for (pair = values; pair; pair = TREE_CHAIN (pair))
6303 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6304 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6305 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6306 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6309 /* Replace the decl nodes in VALUES with their names. */
6310 for (pair = values; pair; pair = TREE_CHAIN (pair))
6311 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6313 TYPE_VALUES (enumtype) = values;
6316 /* Fix up all variant types of this enum type. */
6317 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6319 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6320 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6321 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6322 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6323 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6324 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6325 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6326 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6327 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6330 /* Finish debugging output for this type. */
6331 rest_of_type_compilation (enumtype, toplevel);
6333 /* This matches a push in start_enum. */
6339 /* Build and install a CONST_DECL for one value of the
6340 current enumeration type (one that was begun with start_enum).
6341 Return a tree-list containing the CONST_DECL and its value.
6342 Assignment of sequential values by default is handled here. */
6345 build_enumerator (name, value)
6348 register tree decl, type;
6350 /* Validate and default VALUE. */
6352 /* Remove no-op casts from the value. */
6354 STRIP_TYPE_NOPS (value);
6358 if (TREE_CODE (value) == INTEGER_CST)
6360 value = default_conversion (value);
6361 constant_expression_warning (value);
6365 error ("enumerator value for `%s' not integer constant",
6366 IDENTIFIER_POINTER (name));
6371 /* Default based on previous value. */
6372 /* It should no longer be possible to have NON_LVALUE_EXPR
6376 value = enum_next_value;
6378 error ("overflow in enumeration values");
6381 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6383 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6384 value = integer_zero_node;
6387 /* Set basis for default for next value. */
6388 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6389 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6391 /* Now create a declaration for the enum value name. */
6393 type = TREE_TYPE (value);
6394 type = type_for_size (MAX (TYPE_PRECISION (type),
6395 TYPE_PRECISION (integer_type_node)),
6397 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6398 && TREE_UNSIGNED (type)));
6400 decl = build_decl (CONST_DECL, name, type);
6401 DECL_INITIAL (decl) = value;
6402 TREE_TYPE (value) = type;
6405 return saveable_tree_cons (decl, value, NULL_TREE);
6408 /* Create the FUNCTION_DECL for a function definition.
6409 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6410 the declaration; they describe the function's name and the type it returns,
6411 but twisted together in a fashion that parallels the syntax of C.
6413 This function creates a binding context for the function body
6414 as well as setting up the FUNCTION_DECL in current_function_decl.
6416 Returns 1 on success. If the DECLARATOR is not suitable for a function
6417 (it defines a datum instead), we return 0, which tells
6418 yyparse to report a parse error.
6420 NESTED is nonzero for a function nested within another function. */
6423 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6424 tree declarator, declspecs, prefix_attributes, attributes;
6427 tree decl1, old_decl;
6429 int old_immediate_size_expand = immediate_size_expand;
6431 current_function_returns_value = 0; /* Assume, until we see it does. */
6432 current_function_returns_null = 0;
6433 warn_about_return_type = 0;
6434 current_extern_inline = 0;
6435 c_function_varargs = 0;
6437 shadowed_labels = 0;
6439 /* Don't expand any sizes in the return type of the function. */
6440 immediate_size_expand = 0;
6442 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6444 /* If the declarator is not suitable for a function definition,
6445 cause a syntax error. */
6448 immediate_size_expand = old_immediate_size_expand;
6452 decl_attributes (decl1, prefix_attributes, attributes);
6454 announce_function (decl1);
6456 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6458 error ("return-type is an incomplete type");
6459 /* Make it return void instead. */
6461 = build_function_type (void_type_node,
6462 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6465 if (warn_about_return_type)
6466 warning ("return-type defaults to `int'");
6468 /* Save the parm names or decls from this function's declarator
6469 where store_parm_decls will find them. */
6470 current_function_parms = last_function_parms;
6471 current_function_parm_tags = last_function_parm_tags;
6473 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6474 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6475 DECL_INITIAL (decl1) = error_mark_node;
6477 /* If this definition isn't a prototype and we had a prototype declaration
6478 before, copy the arg type info from that prototype.
6479 But not if what we had before was a builtin function. */
6480 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6481 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6482 && !DECL_BUILT_IN (old_decl)
6483 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6484 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6485 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6487 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6488 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6489 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6492 /* If there is no explicit declaration, look for any out-of-scope implicit
6495 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6497 /* Optionally warn of old-fashioned def with no previous prototype. */
6498 if (warn_strict_prototypes
6499 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6500 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6501 warning ("function declaration isn't a prototype");
6502 /* Optionally warn of any global def with no previous prototype. */
6503 else if (warn_missing_prototypes
6504 && TREE_PUBLIC (decl1)
6505 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6506 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6507 warning_with_decl (decl1, "no previous prototype for `%s'");
6508 /* Optionally warn of any def with no previous prototype
6509 if the function has already been used. */
6510 else if (warn_missing_prototypes
6511 && old_decl != 0 && TREE_USED (old_decl)
6512 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6513 warning_with_decl (decl1,
6514 "`%s' was used with no prototype before its definition");
6515 /* Optionally warn of any global def with no previous declaration. */
6516 else if (warn_missing_declarations
6517 && TREE_PUBLIC (decl1)
6519 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6520 warning_with_decl (decl1, "no previous declaration for `%s'");
6521 /* Optionally warn of any def with no previous declaration
6522 if the function has already been used. */
6523 else if (warn_missing_declarations
6524 && old_decl != 0 && TREE_USED (old_decl)
6525 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6526 warning_with_decl (decl1,
6527 "`%s' was used with no declaration before its definition");
6529 /* This is a definition, not a reference.
6530 So normally clear DECL_EXTERNAL.
6531 However, `extern inline' acts like a declaration
6532 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6533 DECL_EXTERNAL (decl1) = current_extern_inline;
6535 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6536 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6539 /* This function exists in static storage.
6540 (This does not mean `static' in the C sense!) */
6541 TREE_STATIC (decl1) = 1;
6543 /* A nested function is not global. */
6544 if (current_function_decl != 0)
6545 TREE_PUBLIC (decl1) = 0;
6547 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6549 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6554 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6555 != integer_type_node)
6556 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6558 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6559 args = TREE_CHAIN (args))
6561 tree type = args ? TREE_VALUE (args) : 0;
6563 if (type == void_type_node)
6570 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6571 pedwarn_with_decl (decl1,
6572 "first argument of `%s' should be `int'");
6576 if (TREE_CODE (type) != POINTER_TYPE
6577 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6578 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6580 pedwarn_with_decl (decl1,
6581 "second argument of `%s' should be `char **'");
6585 if (TREE_CODE (type) != POINTER_TYPE
6586 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6587 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6589 pedwarn_with_decl (decl1,
6590 "third argument of `%s' should probably be `char **'");
6595 /* It is intentional that this message does not mention the third
6596 argument, which is warned for only pedantically, because it's
6597 blessed by mention in an appendix of the standard. */
6598 if (argct > 0 && (argct < 2 || argct > 3))
6599 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6601 if (argct == 3 && pedantic)
6602 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6604 if (! TREE_PUBLIC (decl1))
6605 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6608 /* Record the decl so that the function name is defined.
6609 If we already have a decl for this name, and it is a FUNCTION_DECL,
6610 use the old decl. */
6612 current_function_decl = pushdecl (decl1);
6615 declare_parm_level (1);
6616 current_binding_level->subblocks_tag_transparent = 1;
6618 make_function_rtl (current_function_decl);
6620 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6621 /* Promote the value to int before returning it. */
6622 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6624 /* It retains unsignedness if traditional
6625 or if not really getting wider. */
6626 if (TREE_UNSIGNED (restype)
6627 && (flag_traditional
6628 || (TYPE_PRECISION (restype)
6629 == TYPE_PRECISION (integer_type_node))))
6630 restype = unsigned_type_node;
6632 restype = integer_type_node;
6634 DECL_RESULT (current_function_decl)
6635 = build_decl (RESULT_DECL, NULL_TREE, restype);
6638 /* Allocate further tree nodes temporarily during compilation
6639 of this function only. */
6640 temporary_allocation ();
6642 /* If this fcn was already referenced via a block-scope `extern' decl
6643 (or an implicit decl), propagate certain information about the usage. */
6644 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6645 TREE_ADDRESSABLE (current_function_decl) = 1;
6647 immediate_size_expand = old_immediate_size_expand;
6652 /* Record that this function is going to be a varargs function.
6653 This is called before store_parm_decls, which is too early
6654 to call mark_varargs directly. */
6659 c_function_varargs = 1;
6662 /* Store the parameter declarations into the current function declaration.
6663 This is called after parsing the parameter declarations, before
6664 digesting the body of the function.
6666 For an old-style definition, modify the function's type
6667 to specify at least the number of arguments. */
6672 register tree fndecl = current_function_decl;
6675 /* This is either a chain of PARM_DECLs (if a prototype was used)
6676 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6677 tree specparms = current_function_parms;
6679 /* This is a list of types declared among parms in a prototype. */
6680 tree parmtags = current_function_parm_tags;
6682 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6683 register tree parmdecls = getdecls ();
6685 /* This is a chain of any other decls that came in among the parm
6686 declarations. If a parm is declared with enum {foo, bar} x;
6687 then CONST_DECLs for foo and bar are put here. */
6690 /* Nonzero if this definition is written with a prototype. */
6693 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6695 /* This case is when the function was defined with an ANSI prototype.
6696 The parms already have decls, so we need not do anything here
6697 except record them as in effect
6698 and complain if any redundant old-style parm decls were written. */
6709 error_with_decl (fndecl,
6710 "parm types given both in parmlist and separately");
6711 /* Get rid of the erroneous decls; don't keep them on
6712 the list of parms, since they might not be PARM_DECLs. */
6713 for (decl = current_binding_level->names;
6714 decl; decl = TREE_CHAIN (decl))
6715 if (DECL_NAME (decl))
6716 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6717 for (link = current_binding_level->shadowed;
6718 link; link = TREE_CHAIN (link))
6719 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6720 current_binding_level->names = 0;
6721 current_binding_level->shadowed = 0;
6724 specparms = nreverse (specparms);
6725 for (parm = specparms; parm; parm = next)
6727 next = TREE_CHAIN (parm);
6728 if (TREE_CODE (parm) == PARM_DECL)
6730 if (DECL_NAME (parm) == 0)
6731 error_with_decl (parm, "parameter name omitted");
6732 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6734 error_with_decl (parm, "parameter `%s' declared void");
6735 /* Change the type to error_mark_node so this parameter
6736 will be ignored by assign_parms. */
6737 TREE_TYPE (parm) = error_mark_node;
6743 /* If we find an enum constant or a type tag,
6744 put it aside for the moment. */
6745 TREE_CHAIN (parm) = 0;
6746 others = chainon (others, parm);
6750 /* Get the decls in their original chain order
6751 and record in the function. */
6752 DECL_ARGUMENTS (fndecl) = getdecls ();
6755 /* If this function takes a variable number of arguments,
6756 add a phony parameter to the end of the parm list,
6757 to represent the position of the first unnamed argument. */
6758 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6761 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6762 /* Let's hope the address of the unnamed parm
6763 won't depend on its type. */
6764 TREE_TYPE (dummy) = integer_type_node;
6765 DECL_ARG_TYPE (dummy) = integer_type_node;
6766 DECL_ARGUMENTS (fndecl)
6767 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6771 /* Now pushdecl the enum constants. */
6772 for (parm = others; parm; parm = next)
6774 next = TREE_CHAIN (parm);
6775 if (DECL_NAME (parm) == 0)
6777 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6779 else if (TREE_CODE (parm) != PARM_DECL)
6783 storetags (chainon (parmtags, gettags ()));
6787 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6788 each with a parm name as the TREE_VALUE.
6790 PARMDECLS is a chain of declarations for parameters.
6791 Warning! It can also contain CONST_DECLs which are not parameters
6792 but are names of enumerators of any enum types
6793 declared among the parameters.
6795 First match each formal parameter name with its declaration.
6796 Associate decls with the names and store the decls
6797 into the TREE_PURPOSE slots. */
6799 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6800 DECL_RESULT (parm) = 0;
6802 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6804 register tree tail, found = NULL;
6806 if (TREE_VALUE (parm) == 0)
6808 error_with_decl (fndecl, "parameter name missing from parameter list");
6809 TREE_PURPOSE (parm) = 0;
6813 /* See if any of the parmdecls specifies this parm by name.
6814 Ignore any enumerator decls. */
6815 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6816 if (DECL_NAME (tail) == TREE_VALUE (parm)
6817 && TREE_CODE (tail) == PARM_DECL)
6823 /* If declaration already marked, we have a duplicate name.
6824 Complain, and don't use this decl twice. */
6825 if (found && DECL_RESULT (found) != 0)
6827 error_with_decl (found, "multiple parameters named `%s'");
6831 /* If the declaration says "void", complain and ignore it. */
6832 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6834 error_with_decl (found, "parameter `%s' declared void");
6835 TREE_TYPE (found) = integer_type_node;
6836 DECL_ARG_TYPE (found) = integer_type_node;
6837 layout_decl (found, 0);
6840 /* Traditionally, a parm declared float is actually a double. */
6841 if (found && flag_traditional
6842 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6844 TREE_TYPE (found) = double_type_node;
6845 DECL_ARG_TYPE (found) = double_type_node;
6846 layout_decl (found, 0);
6849 /* If no declaration found, default to int. */
6852 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6854 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6855 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6856 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6858 warning_with_decl (found, "type of `%s' defaults to `int'");
6862 TREE_PURPOSE (parm) = found;
6864 /* Mark this decl as "already found" -- see test, above.
6865 It is safe to use DECL_RESULT for this
6866 since it is not used in PARM_DECLs or CONST_DECLs. */
6867 DECL_RESULT (found) = error_mark_node;
6870 /* Put anything which is on the parmdecls chain and which is
6871 not a PARM_DECL onto the list NONPARMS. (The types of
6872 non-parm things which might appear on the list include
6873 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6874 any actual PARM_DECLs not matched with any names. */
6877 for (parm = parmdecls; parm; )
6879 tree next = TREE_CHAIN (parm);
6880 TREE_CHAIN (parm) = 0;
6882 if (TREE_CODE (parm) != PARM_DECL)
6883 nonparms = chainon (nonparms, parm);
6886 /* Complain about args with incomplete types. */
6887 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6889 error_with_decl (parm, "parameter `%s' has incomplete type");
6890 TREE_TYPE (parm) = error_mark_node;
6893 if (DECL_RESULT (parm) == 0)
6895 error_with_decl (parm,
6896 "declaration for parameter `%s' but no such parameter");
6897 /* Pretend the parameter was not missing.
6898 This gets us to a standard state and minimizes
6899 further error messages. */
6901 = chainon (specparms,
6902 tree_cons (parm, NULL_TREE, NULL_TREE));
6909 /* Chain the declarations together in the order of the list of names. */
6910 /* Store that chain in the function decl, replacing the list of names. */
6912 DECL_ARGUMENTS (fndecl) = 0;
6915 for (last = 0; parm; parm = TREE_CHAIN (parm))
6916 if (TREE_PURPOSE (parm))
6919 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6921 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6922 last = TREE_PURPOSE (parm);
6923 TREE_CHAIN (last) = 0;
6927 /* If there was a previous prototype,
6928 set the DECL_ARG_TYPE of each argument according to
6929 the type previously specified, and report any mismatches. */
6931 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6934 for (parm = DECL_ARGUMENTS (fndecl),
6935 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6936 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6937 != void_type_node));
6938 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6940 if (parm == 0 || type == 0
6941 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6943 error ("number of arguments doesn't match prototype");
6944 error_with_file_and_line (current_function_prototype_file,
6945 current_function_prototype_line,
6946 "prototype declaration");
6949 /* Type for passing arg must be consistent
6950 with that declared for the arg. */
6951 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6953 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6954 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6956 /* Adjust argument to match prototype. E.g. a previous
6957 `int foo(float);' prototype causes
6958 `int foo(x) float x; {...}' to be treated like
6959 `int foo(float x) {...}'. This is particularly
6960 useful for argument types like uid_t. */
6961 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6962 #ifdef PROMOTE_PROTOTYPES
6963 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6964 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6965 && TYPE_PRECISION (TREE_TYPE (parm))
6966 < TYPE_PRECISION (integer_type_node))
6967 DECL_ARG_TYPE (parm) = integer_type_node;
6971 pedwarn ("promoted argument `%s' doesn't match prototype",
6972 IDENTIFIER_POINTER (DECL_NAME (parm)));
6973 warning_with_file_and_line
6974 (current_function_prototype_file,
6975 current_function_prototype_line,
6976 "prototype declaration");
6979 /* If -traditional, allow `int' argument to match
6980 `unsigned' prototype. */
6981 else if (! (flag_traditional
6982 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6983 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6985 error ("argument `%s' doesn't match prototype",
6986 IDENTIFIER_POINTER (DECL_NAME (parm)));
6987 error_with_file_and_line (current_function_prototype_file,
6988 current_function_prototype_line,
6989 "prototype declaration");
6993 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6996 /* Otherwise, create a prototype that would match. */
7000 tree actual = 0, last = 0, type;
7002 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
7004 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
7007 TREE_CHAIN (last) = type;
7012 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
7014 TREE_CHAIN (last) = type;
7018 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7019 of the type of this function, but we need to avoid having this
7020 affect the types of other similarly-typed functions, so we must
7021 first force the generation of an identical (but separate) type
7022 node for the relevant function type. The new node we create
7023 will be a variant of the main variant of the original function
7026 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
7028 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
7031 /* Now store the final chain of decls for the arguments
7032 as the decl-chain of the current lexical scope.
7033 Put the enumerators in as well, at the front so that
7034 DECL_ARGUMENTS is not modified. */
7036 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
7039 /* Make sure the binding level for the top of the function body
7040 gets a BLOCK if there are any in the function.
7041 Otherwise, the dbx output is wrong. */
7043 keep_next_if_subblocks = 1;
7045 /* ??? This might be an improvement,
7046 but needs to be thought about some more. */
7048 keep_next_level_flag = 1;
7051 /* Write a record describing this function definition to the prototypes
7052 file (if requested). */
7054 gen_aux_info_record (fndecl, 1, 0, prototype);
7056 /* Initialize the RTL code for the function. */
7058 init_function_start (fndecl, input_filename, lineno);
7060 /* If this is a varargs function, inform function.c. */
7062 if (c_function_varargs)
7065 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
7067 declare_function_name ();
7069 /* Set up parameters and prepare for return, for the function. */
7071 expand_function_start (fndecl, 0);
7073 /* If this function is `main', emit a call to `__main'
7074 to run global initializers, etc. */
7075 if (DECL_NAME (fndecl)
7076 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
7077 && DECL_CONTEXT (fndecl) == NULL_TREE)
7078 expand_main_function ();
7081 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
7082 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
7083 stands for an ellipsis in the identifier list.
7085 PARMLIST is the data returned by get_parm_info for the
7086 parmlist that follows the semicolon.
7088 We return a value of the same sort that get_parm_info returns,
7089 except that it describes the combination of identifiers and parmlist. */
7092 combine_parm_decls (specparms, parmlist, void_at_end)
7093 tree specparms, parmlist;
7096 register tree fndecl = current_function_decl;
7099 tree parmdecls = TREE_PURPOSE (parmlist);
7101 /* This is a chain of any other decls that came in among the parm
7102 declarations. They were separated already by get_parm_info,
7103 so we just need to keep them separate. */
7104 tree nonparms = TREE_VALUE (parmlist);
7108 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
7109 DECL_RESULT (parm) = 0;
7111 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
7113 register tree tail, found = NULL;
7115 /* See if any of the parmdecls specifies this parm by name. */
7116 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
7117 if (DECL_NAME (tail) == TREE_VALUE (parm))
7123 /* If declaration already marked, we have a duplicate name.
7124 Complain, and don't use this decl twice. */
7125 if (found && DECL_RESULT (found) != 0)
7127 error_with_decl (found, "multiple parameters named `%s'");
7131 /* If the declaration says "void", complain and ignore it. */
7132 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7134 error_with_decl (found, "parameter `%s' declared void");
7135 TREE_TYPE (found) = integer_type_node;
7136 DECL_ARG_TYPE (found) = integer_type_node;
7137 layout_decl (found, 0);
7140 /* Traditionally, a parm declared float is actually a double. */
7141 if (found && flag_traditional
7142 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7144 TREE_TYPE (found) = double_type_node;
7145 DECL_ARG_TYPE (found) = double_type_node;
7146 layout_decl (found, 0);
7149 /* If no declaration found, default to int. */
7152 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7154 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7155 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7156 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7157 error_with_decl (found, "type of parameter `%s' is not declared");
7161 TREE_PURPOSE (parm) = found;
7163 /* Mark this decl as "already found" -- see test, above.
7164 It is safe to use DECL_RESULT for this
7165 since it is not used in PARM_DECLs or CONST_DECLs. */
7166 DECL_RESULT (found) = error_mark_node;
7169 /* Complain about any actual PARM_DECLs not matched with any names. */
7171 for (parm = parmdecls; parm; )
7173 tree next = TREE_CHAIN (parm);
7174 TREE_CHAIN (parm) = 0;
7176 /* Complain about args with incomplete types. */
7177 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7179 error_with_decl (parm, "parameter `%s' has incomplete type");
7180 TREE_TYPE (parm) = error_mark_node;
7183 if (DECL_RESULT (parm) == 0)
7185 error_with_decl (parm,
7186 "declaration for parameter `%s' but no such parameter");
7187 /* Pretend the parameter was not missing.
7188 This gets us to a standard state and minimizes
7189 further error messages. */
7191 = chainon (specparms,
7192 tree_cons (parm, NULL_TREE, NULL_TREE));
7198 /* Chain the declarations together in the order of the list of names.
7199 At the same time, build up a list of their types, in reverse order. */
7205 for (last = 0; parm; parm = TREE_CHAIN (parm))
7206 if (TREE_PURPOSE (parm))
7209 parmdecls = TREE_PURPOSE (parm);
7211 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7212 last = TREE_PURPOSE (parm);
7213 TREE_CHAIN (last) = 0;
7215 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7220 return saveable_tree_cons (parmdecls, nonparms,
7221 nreverse (saveable_tree_cons (NULL_TREE,
7225 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7228 /* Finish up a function declaration and compile that function
7229 all the way to assembler language output. The free the storage
7230 for the function definition.
7232 This is called after parsing the body of the function definition.
7234 NESTED is nonzero if the function being finished is nested in another. */
7237 finish_function (nested)
7240 register tree fndecl = current_function_decl;
7242 /* TREE_READONLY (fndecl) = 1;
7243 This caused &foo to be of type ptr-to-const-function
7244 which then got a warning when stored in a ptr-to-function variable. */
7247 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7249 /* Must mark the RESULT_DECL as being in this function. */
7251 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7253 /* Obey `register' declarations if `setjmp' is called in this fn. */
7254 if (flag_traditional && current_function_calls_setjmp)
7256 setjmp_protect (DECL_INITIAL (fndecl));
7257 setjmp_protect_args ();
7260 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7262 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7263 != integer_type_node)
7265 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
7266 If warn_main is -1 (-Wno-main) we don't want to be warned. */
7268 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7272 #ifdef DEFAULT_MAIN_RETURN
7273 /* Make it so that `main' always returns success by default. */
7274 DEFAULT_MAIN_RETURN;
7279 /* Generate rtl for function exit. */
7280 expand_function_end (input_filename, lineno, 0);
7282 /* So we can tell if jump_optimize sets it to 1. */
7285 /* Run the optimizers and output the assembler code for this function. */
7286 rest_of_compilation (fndecl);
7288 current_function_returns_null |= can_reach_end;
7290 if (warn_missing_noreturn
7291 && !TREE_THIS_VOLATILE (fndecl)
7292 && !current_function_returns_null
7293 && !current_function_returns_value)
7294 warning ("function might be possible candidate for attribute `noreturn'");
7296 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7297 warning ("`noreturn' function does return");
7298 else if (warn_return_type && can_reach_end
7299 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7300 /* If this function returns non-void and control can drop through,
7302 warning ("control reaches end of non-void function");
7303 /* With just -W, complain only if function returns both with
7304 and without a value. */
7305 else if (extra_warnings
7306 && current_function_returns_value && current_function_returns_null)
7307 warning ("this function may return with or without a value");
7309 /* If requested, warn about function definitions where the function will
7310 return a value (usually of some struct or union type) which itself will
7311 take up a lot of stack space. */
7313 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7315 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7319 register tree ret_type_size = TYPE_SIZE (ret_type);
7321 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7324 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7326 if (units > larger_than_size)
7327 warning_with_decl (fndecl,
7328 "size of return value of `%s' is %u bytes",
7334 /* Free all the tree nodes making up this function. */
7335 /* Switch back to allocating nodes permanently
7336 until we start another function. */
7338 permanent_allocation (1);
7340 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7342 /* Stop pointing to the local nodes about to be freed. */
7343 /* But DECL_INITIAL must remain nonzero so we know this
7344 was an actual function definition. */
7345 /* For a nested function, this is done in pop_c_function_context. */
7346 /* If rest_of_compilation set this to 0, leave it 0. */
7347 if (DECL_INITIAL (fndecl) != 0)
7348 DECL_INITIAL (fndecl) = error_mark_node;
7349 DECL_ARGUMENTS (fndecl) = 0;
7352 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7354 #ifndef ASM_OUTPUT_CONSTRUCTOR
7355 if (! flag_gnu_linker)
7356 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7359 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7361 if (DECL_STATIC_DESTRUCTOR (fndecl))
7363 #ifndef ASM_OUTPUT_DESTRUCTOR
7364 if (! flag_gnu_linker)
7365 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7368 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7373 /* Let the error reporting routines know that we're outside a
7374 function. For a nested function, this value is used in
7375 pop_c_function_context and then reset via pop_function_context. */
7376 current_function_decl = NULL;
7380 /* Save and restore the variables in this file and elsewhere
7381 that keep track of the progress of compilation of the current function.
7382 Used for nested functions. */
7386 struct c_function *next;
7388 tree shadowed_labels;
7391 int warn_about_return_type;
7393 struct binding_level *binding_level;
7396 struct c_function *c_function_chain;
7398 /* Save and reinitialize the variables
7399 used during compilation of a C function. */
7402 push_c_function_context ()
7404 struct c_function *p
7405 = (struct c_function *) xmalloc (sizeof (struct c_function));
7408 pedwarn ("ANSI C forbids nested functions");
7410 push_function_context ();
7412 p->next = c_function_chain;
7413 c_function_chain = p;
7415 p->named_labels = named_labels;
7416 p->shadowed_labels = shadowed_labels;
7417 p->returns_value = current_function_returns_value;
7418 p->returns_null = current_function_returns_null;
7419 p->warn_about_return_type = warn_about_return_type;
7420 p->extern_inline = current_extern_inline;
7421 p->binding_level = current_binding_level;
7424 /* Restore the variables used during compilation of a C function. */
7427 pop_c_function_context ()
7429 struct c_function *p = c_function_chain;
7432 /* Bring back all the labels that were shadowed. */
7433 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7434 if (DECL_NAME (TREE_VALUE (link)) != 0)
7435 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7436 = TREE_VALUE (link);
7438 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7440 /* Stop pointing to the local nodes about to be freed. */
7441 /* But DECL_INITIAL must remain nonzero so we know this
7442 was an actual function definition. */
7443 DECL_INITIAL (current_function_decl) = error_mark_node;
7444 DECL_ARGUMENTS (current_function_decl) = 0;
7447 pop_function_context ();
7449 c_function_chain = p->next;
7451 named_labels = p->named_labels;
7452 shadowed_labels = p->shadowed_labels;
7453 current_function_returns_value = p->returns_value;
7454 current_function_returns_null = p->returns_null;
7455 warn_about_return_type = p->warn_about_return_type;
7456 current_extern_inline = p->extern_inline;
7457 current_binding_level = p->binding_level;
7462 /* integrate_decl_tree calls this function, but since we don't use the
7463 DECL_LANG_SPECIFIC field, this is a no-op. */
7466 copy_lang_decl (node)
7467 tree node ATTRIBUTE_UNUSED;