2002-02-19 Philip Blundell <philb@gnu.org>
[official-gcc.git] / gcc / c-decl.c
blob1ab120af1df345dd2f88f95a128711d385b24fce
1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
10 version.
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
20 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. */
29 #include "config.h"
30 #include "system.h"
31 #include "intl.h"
32 #include "tree.h"
33 #include "tree-inline.h"
34 #include "rtl.h"
35 #include "flags.h"
36 #include "function.h"
37 #include "output.h"
38 #include "expr.h"
39 #include "c-tree.h"
40 #include "c-lex.h"
41 #include "toplev.h"
42 #include "ggc.h"
43 #include "tm_p.h"
44 #include "cpplib.h"
45 #include "target.h"
46 #include "debug.h"
47 #include "timevar.h"
48 #include "c-common.h"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
51 enum decl_context
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file;
66 int pending_invalid_xref_line;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
72 that case. */
74 static tree enum_next_value;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file;
102 static int current_function_prototype_line;
104 /* The current statement tree. */
106 static struct stmt_tree_s c_stmt_tree;
108 /* The current scope statement stack. */
110 static tree c_scope_stmt_stack;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static tree named_labels;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static tree shadowed_labels;
122 /* Nonzero when store_parm_decls is called indicates a varargs function.
123 Value not meaningful after store_parm_decls. */
125 static int c_function_varargs;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* For each binding contour we allocate a binding_level structure
152 * which records the names defined in that contour.
153 * Contours include:
154 * 0) the global one
155 * 1) one for each function definition,
156 * where internal declarations of the parameters appear.
157 * 2) one for each compound statement,
158 * to record its declarations.
160 * The current meaning of a name can be found by searching the levels from
161 * the current one out to the global one.
164 /* Note that the information in the `names' component of the global contour
165 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
167 struct binding_level
169 /* A chain of _DECL nodes for all variables, constants, functions,
170 and typedef types. These are in the reverse of the order supplied.
172 tree names;
174 /* A list of structure, union and enum definitions,
175 * for looking up tag names.
176 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
177 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
178 * or ENUMERAL_TYPE node.
180 tree tags;
182 /* For each level, a list of shadowed outer-level local definitions
183 to be restored when this level is popped.
184 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
185 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
186 tree shadowed;
188 /* For each level (except not the global one),
189 a chain of BLOCK nodes for all the levels
190 that were entered and exited one level down. */
191 tree blocks;
193 /* The BLOCK node for this level, if one has been preallocated.
194 If 0, the BLOCK is allocated (if needed) when the level is popped. */
195 tree this_block;
197 /* The binding level which this one is contained in (inherits from). */
198 struct binding_level *level_chain;
200 /* Nonzero for the level that holds the parameters of a function. */
201 char parm_flag;
203 /* Nonzero if this level "doesn't exist" for tags. */
204 char tag_transparent;
206 /* Nonzero if sublevels of this level "don't exist" for tags.
207 This is set in the parm level of a function definition
208 while reading the function body, so that the outermost block
209 of the function body will be tag-transparent. */
210 char subblocks_tag_transparent;
212 /* Nonzero means make a BLOCK for this level regardless of all else. */
213 char keep;
215 /* Nonzero means make a BLOCK if this level has any subblocks. */
216 char keep_if_subblocks;
218 /* Number of decls in `names' that have incomplete
219 structure or union types. */
220 int n_incomplete;
222 /* A list of decls giving the (reversed) specified order of parms,
223 not including any forward-decls in the parmlist.
224 This is so we can put the parms in proper order for assign_parms. */
225 tree parm_order;
228 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
230 /* The binding level currently in effect. */
232 static struct binding_level *current_binding_level;
234 /* A chain of binding_level structures awaiting reuse. */
236 static struct binding_level *free_binding_level;
238 /* The outermost binding level, for names of file scope.
239 This is created when the compiler is started and exists
240 through the entire run. */
242 static struct binding_level *global_binding_level;
244 /* Binding level structures are initialized by copying this one. */
246 static struct binding_level clear_binding_level
247 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
248 NULL};
250 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
252 static int keep_next_level_flag;
254 /* Nonzero means make a BLOCK for the next level pushed
255 if it has subblocks. */
257 static int keep_next_if_subblocks;
259 /* The chain of outer levels of label scopes.
260 This uses the same data structure used for binding levels,
261 but it works differently: each link in the chain records
262 saved values of named_labels and shadowed_labels for
263 a label binding level outside the current one. */
265 static struct binding_level *label_level_chain;
267 /* Functions called automatically at the beginning and end of execution. */
269 tree static_ctors, static_dtors;
271 /* Forward declarations. */
273 static struct binding_level * make_binding_level PARAMS ((void));
274 static void mark_binding_level PARAMS ((void *));
275 static void clear_limbo_values PARAMS ((tree));
276 static int duplicate_decls PARAMS ((tree, tree, int));
277 static int redeclaration_error_message PARAMS ((tree, tree));
278 static void storedecls PARAMS ((tree));
279 static void storetags PARAMS ((tree));
280 static tree lookup_tag PARAMS ((enum tree_code, tree,
281 struct binding_level *, int));
282 static tree lookup_tag_reverse PARAMS ((tree));
283 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
284 int));
285 static tree grokparms PARAMS ((tree, int));
286 static void layout_array_type PARAMS ((tree));
287 static tree c_make_fname_decl PARAMS ((tree, int));
288 static void c_expand_body PARAMS ((tree, int, int));
289 static void warn_if_shadowing PARAMS ((tree, tree));
291 /* C-specific option variables. */
293 /* Nonzero means allow type mismatches in conditional expressions;
294 just make their values `void'. */
296 int flag_cond_mismatch;
298 /* Nonzero means don't recognize the keyword `asm'. */
300 int flag_no_asm;
302 /* Nonzero means do some things the same way PCC does. */
304 int flag_traditional;
306 /* Nonzero means enable C89 Amendment 1 features. */
308 int flag_isoc94 = 0;
310 /* Nonzero means use the ISO C99 dialect of C. */
312 int flag_isoc99 = 0;
314 /* Nonzero means that we have builtin functions, and main is an int */
316 int flag_hosted = 1;
318 /* Nonzero means add default format_arg attributes for functions not
319 in ISO C. */
321 int flag_noniso_default_format_attributes = 1;
323 /* Nonzero means to allow single precision math even if we're generally
324 being traditional. */
325 int flag_allow_single_precision = 0;
327 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
329 int flag_signed_bitfields = 1;
330 int explicit_flag_signed_bitfields = 0;
332 /* Nonzero means warn about use of implicit int. */
334 int warn_implicit_int;
336 /* Nonzero means warn about usage of long long when `-pedantic'. */
338 int warn_long_long = 1;
340 /* Nonzero means message about use of implicit function declarations;
341 1 means warning; 2 means error. */
343 int mesg_implicit_function_declaration = -1;
345 /* Nonzero means give string constants the type `const char *'
346 to get extra warnings from them. These warnings will be too numerous
347 to be useful, except in thoroughly ANSIfied programs. */
349 int flag_const_strings;
351 /* Nonzero means warn about pointer casts that can drop a type qualifier
352 from the pointer target type. */
354 int warn_cast_qual;
356 /* Nonzero means warn when casting a function call to a type that does
357 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
358 when there is no previous declaration of sqrt or malloc. */
360 int warn_bad_function_cast;
362 /* Warn about functions which might be candidates for format attributes. */
364 int warn_missing_format_attribute;
366 /* Warn about traditional constructs whose meanings changed in ANSI C. */
368 int warn_traditional;
370 /* Nonzero means warn about sizeof(function) or addition/subtraction
371 of function pointers. */
373 int warn_pointer_arith;
375 /* Nonzero means warn for non-prototype function decls
376 or non-prototyped defs without previous prototype. */
378 int warn_strict_prototypes;
380 /* Nonzero means warn for any global function def
381 without separate previous prototype decl. */
383 int warn_missing_prototypes;
385 /* Nonzero means warn for any global function def
386 without separate previous decl. */
388 int warn_missing_declarations;
390 /* Nonzero means warn about multiple (redundant) decls for the same single
391 variable or function. */
393 int warn_redundant_decls = 0;
395 /* Nonzero means warn about extern declarations of objects not at
396 file-scope level and about *all* declarations of functions (whether
397 extern or static) not at file-scope level. Note that we exclude
398 implicit function declarations. To get warnings about those, use
399 -Wimplicit. */
401 int warn_nested_externs = 0;
403 /* Warn about a subscript that has type char. */
405 int warn_char_subscripts = 0;
407 /* Warn if a type conversion is done that might have confusing results. */
409 int warn_conversion;
411 /* Warn if adding () is suggested. */
413 int warn_parentheses;
415 /* Warn if initializer is not completely bracketed. */
417 int warn_missing_braces;
419 /* Warn if main is suspicious. */
421 int warn_main;
423 /* Warn about #pragma directives that are not recognised. */
425 int warn_unknown_pragmas = 0; /* Tri state variable. */
427 /* Warn about comparison of signed and unsigned values.
428 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
430 int warn_sign_compare = -1;
432 /* Warn about testing equality of floating point numbers. */
434 int warn_float_equal = 0;
436 /* Nonzero means warn about use of multicharacter literals. */
438 int warn_multichar = 1;
440 /* Nonzero means `$' can be in an identifier. */
442 #ifndef DOLLARS_IN_IDENTIFIERS
443 #define DOLLARS_IN_IDENTIFIERS 1
444 #endif
445 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
447 /* States indicating how grokdeclarator() should handle declspecs marked
448 with __attribute__((deprecated)). An object declared as
449 __attribute__((deprecated)) suppresses warnings of uses of other
450 deprecated items. */
452 enum deprecated_states {
453 DEPRECATED_NORMAL,
454 DEPRECATED_SUPPRESS
457 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
459 /* Decode the string P as a language-specific option for C.
460 Return the number of strings consumed. Should not complain
461 if it does not recognise the option. */
464 c_decode_option (argc, argv)
465 int argc ATTRIBUTE_UNUSED;
466 char **argv;
468 int strings_processed;
469 char *p = argv[0];
471 strings_processed = cpp_handle_option (parse_in, argc, argv, 0);
473 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
475 warning ("-traditional is deprecated and may be removed");
476 flag_traditional = 1;
477 flag_writable_strings = 1;
479 else if (!strcmp (p, "-fallow-single-precision"))
480 flag_allow_single_precision = 1;
481 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
483 flag_hosted = 1;
484 flag_no_builtin = 0;
486 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
488 flag_hosted = 0;
489 flag_no_builtin = 1;
490 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
491 if (warn_main == 2)
492 warn_main = 0;
494 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
496 flag_traditional = 0;
497 flag_writable_strings = 0;
499 else if (!strncmp (p, "-std=", 5))
501 /* Select the appropriate language standard. We currently
502 recognize:
503 -std=iso9899:1990 same as -ansi
504 -std=iso9899:199409 ISO C as modified in amend. 1
505 -std=iso9899:1999 ISO C 99
506 -std=c89 same as -std=iso9899:1990
507 -std=c99 same as -std=iso9899:1999
508 -std=gnu89 default, iso9899:1990 + gnu extensions
509 -std=gnu99 iso9899:1999 + gnu extensions
511 const char *const argstart = &p[5];
513 if (!strcmp (argstart, "iso9899:1990")
514 || !strcmp (argstart, "c89"))
516 iso_1990:
517 flag_isoc94 = 0;
518 iso_1994:
519 flag_traditional = 0;
520 flag_writable_strings = 0;
521 flag_no_asm = 1;
522 flag_no_nonansi_builtin = 1;
523 flag_noniso_default_format_attributes = 0;
524 flag_isoc99 = 0;
526 else if (!strcmp (argstart, "iso9899:199409"))
528 flag_isoc94 = 1;
529 goto iso_1994;
531 else if (!strcmp (argstart, "iso9899:199x")
532 || !strcmp (argstart, "iso9899:1999")
533 || !strcmp (argstart, "c9x")
534 || !strcmp (argstart, "c99"))
536 flag_traditional = 0;
537 flag_writable_strings = 0;
538 flag_no_asm = 1;
539 flag_no_nonansi_builtin = 1;
540 flag_noniso_default_format_attributes = 0;
541 flag_isoc99 = 1;
542 flag_isoc94 = 1;
544 else if (!strcmp (argstart, "gnu89"))
546 flag_traditional = 0;
547 flag_writable_strings = 0;
548 flag_no_asm = 0;
549 flag_no_nonansi_builtin = 0;
550 flag_noniso_default_format_attributes = 1;
551 flag_isoc99 = 0;
552 flag_isoc94 = 0;
554 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
556 flag_traditional = 0;
557 flag_writable_strings = 0;
558 flag_no_asm = 0;
559 flag_no_nonansi_builtin = 0;
560 flag_noniso_default_format_attributes = 1;
561 flag_isoc99 = 1;
562 flag_isoc94 = 1;
564 else
565 error ("unknown C standard `%s'", argstart);
567 else if (!strcmp (p, "-fdollars-in-identifiers"))
568 dollars_in_ident = 1;
569 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
570 dollars_in_ident = 0;
571 else if (!strcmp (p, "-fsigned-char"))
572 flag_signed_char = 1;
573 else if (!strcmp (p, "-funsigned-char"))
574 flag_signed_char = 0;
575 else if (!strcmp (p, "-fno-signed-char"))
576 flag_signed_char = 0;
577 else if (!strcmp (p, "-fno-unsigned-char"))
578 flag_signed_char = 1;
579 else if (!strcmp (p, "-fsigned-bitfields")
580 || !strcmp (p, "-fno-unsigned-bitfields"))
582 flag_signed_bitfields = 1;
583 explicit_flag_signed_bitfields = 1;
585 else if (!strcmp (p, "-funsigned-bitfields")
586 || !strcmp (p, "-fno-signed-bitfields"))
588 flag_signed_bitfields = 0;
589 explicit_flag_signed_bitfields = 1;
591 else if (!strcmp (p, "-fshort-enums"))
592 flag_short_enums = 1;
593 else if (!strcmp (p, "-fno-short-enums"))
594 flag_short_enums = 0;
595 else if (!strcmp (p, "-fshort-wchar"))
596 flag_short_wchar = 1;
597 else if (!strcmp (p, "-fno-short-wchar"))
598 flag_short_wchar = 0;
599 else if (!strcmp (p, "-fcond-mismatch"))
600 flag_cond_mismatch = 1;
601 else if (!strcmp (p, "-fno-cond-mismatch"))
602 flag_cond_mismatch = 0;
603 else if (!strcmp (p, "-fshort-double"))
604 flag_short_double = 1;
605 else if (!strcmp (p, "-fno-short-double"))
606 flag_short_double = 0;
607 else if (!strcmp (p, "-fasm"))
608 flag_no_asm = 0;
609 else if (!strcmp (p, "-fno-asm"))
610 flag_no_asm = 1;
611 else if (!strcmp (p, "-fbuiltin"))
612 flag_no_builtin = 0;
613 else if (!strcmp (p, "-fno-builtin"))
614 flag_no_builtin = 1;
615 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
616 disable_builtin_function (p + strlen ("-fno-builtin-"));
617 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
619 else if (!strcmp (p, "-ansi"))
620 goto iso_1990;
621 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
622 mesg_implicit_function_declaration = 2;
623 else if (!strcmp (p, "-Wimplicit-function-declaration"))
624 mesg_implicit_function_declaration = 1;
625 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
626 mesg_implicit_function_declaration = 0;
627 else if (!strcmp (p, "-Wimplicit-int"))
628 warn_implicit_int = 1;
629 else if (!strcmp (p, "-Wno-implicit-int"))
630 warn_implicit_int = 0;
631 else if (!strcmp (p, "-Wimplicit"))
633 warn_implicit_int = 1;
634 if (mesg_implicit_function_declaration != 2)
635 mesg_implicit_function_declaration = 1;
637 else if (!strcmp (p, "-Wno-implicit"))
638 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
639 else if (!strcmp (p, "-Wlong-long"))
640 warn_long_long = 1;
641 else if (!strcmp (p, "-Wno-long-long"))
642 warn_long_long = 0;
643 else if (!strcmp (p, "-Wwrite-strings"))
644 flag_const_strings = 1;
645 else if (!strcmp (p, "-Wno-write-strings"))
646 flag_const_strings = 0;
647 else if (!strcmp (p, "-Wcast-qual"))
648 warn_cast_qual = 1;
649 else if (!strcmp (p, "-Wno-cast-qual"))
650 warn_cast_qual = 0;
651 else if (!strcmp (p, "-Wbad-function-cast"))
652 warn_bad_function_cast = 1;
653 else if (!strcmp (p, "-Wno-bad-function-cast"))
654 warn_bad_function_cast = 0;
655 else if (!strcmp (p, "-Wno-missing-noreturn"))
656 warn_missing_noreturn = 0;
657 else if (!strcmp (p, "-Wmissing-format-attribute"))
658 warn_missing_format_attribute = 1;
659 else if (!strcmp (p, "-Wno-missing-format-attribute"))
660 warn_missing_format_attribute = 0;
661 else if (!strcmp (p, "-Wpointer-arith"))
662 warn_pointer_arith = 1;
663 else if (!strcmp (p, "-Wno-pointer-arith"))
664 warn_pointer_arith = 0;
665 else if (!strcmp (p, "-Wstrict-prototypes"))
666 warn_strict_prototypes = 1;
667 else if (!strcmp (p, "-Wno-strict-prototypes"))
668 warn_strict_prototypes = 0;
669 else if (!strcmp (p, "-Wmissing-prototypes"))
670 warn_missing_prototypes = 1;
671 else if (!strcmp (p, "-Wno-missing-prototypes"))
672 warn_missing_prototypes = 0;
673 else if (!strcmp (p, "-Wmissing-declarations"))
674 warn_missing_declarations = 1;
675 else if (!strcmp (p, "-Wno-missing-declarations"))
676 warn_missing_declarations = 0;
677 else if (!strcmp (p, "-Wredundant-decls"))
678 warn_redundant_decls = 1;
679 else if (!strcmp (p, "-Wno-redundant-decls"))
680 warn_redundant_decls = 0;
681 else if (!strcmp (p, "-Wnested-externs"))
682 warn_nested_externs = 1;
683 else if (!strcmp (p, "-Wno-nested-externs"))
684 warn_nested_externs = 0;
685 else if (!strcmp (p, "-Wtraditional"))
686 warn_traditional = 1;
687 else if (!strcmp (p, "-Wno-traditional"))
688 warn_traditional = 0;
689 else if (!strncmp (p, "-Wformat=", 9))
690 set_Wformat (atoi (p + 9));
691 else if (!strcmp (p, "-Wformat"))
692 set_Wformat (1);
693 else if (!strcmp (p, "-Wno-format"))
694 set_Wformat (0);
695 else if (!strcmp (p, "-Wformat-y2k"))
696 warn_format_y2k = 1;
697 else if (!strcmp (p, "-Wno-format-y2k"))
698 warn_format_y2k = 0;
699 else if (!strcmp (p, "-Wformat-extra-args"))
700 warn_format_extra_args = 1;
701 else if (!strcmp (p, "-Wno-format-extra-args"))
702 warn_format_extra_args = 0;
703 else if (!strcmp (p, "-Wformat-nonliteral"))
704 warn_format_nonliteral = 1;
705 else if (!strcmp (p, "-Wno-format-nonliteral"))
706 warn_format_nonliteral = 0;
707 else if (!strcmp (p, "-Wformat-security"))
708 warn_format_security = 1;
709 else if (!strcmp (p, "-Wno-format-security"))
710 warn_format_security = 0;
711 else if (!strcmp (p, "-Wchar-subscripts"))
712 warn_char_subscripts = 1;
713 else if (!strcmp (p, "-Wno-char-subscripts"))
714 warn_char_subscripts = 0;
715 else if (!strcmp (p, "-Wconversion"))
716 warn_conversion = 1;
717 else if (!strcmp (p, "-Wno-conversion"))
718 warn_conversion = 0;
719 else if (!strcmp (p, "-Wparentheses"))
720 warn_parentheses = 1;
721 else if (!strcmp (p, "-Wno-parentheses"))
722 warn_parentheses = 0;
723 else if (!strcmp (p, "-Wreturn-type"))
724 warn_return_type = 1;
725 else if (!strcmp (p, "-Wno-return-type"))
726 warn_return_type = 0;
727 else if (!strcmp (p, "-Wsequence-point"))
728 warn_sequence_point = 1;
729 else if (!strcmp (p, "-Wno-sequence-point"))
730 warn_sequence_point = 0;
731 else if (!strcmp (p, "-Wcomment"))
732 ; /* cpp handles this one. */
733 else if (!strcmp (p, "-Wno-comment"))
734 ; /* cpp handles this one. */
735 else if (!strcmp (p, "-Wcomments"))
736 ; /* cpp handles this one. */
737 else if (!strcmp (p, "-Wno-comments"))
738 ; /* cpp handles this one. */
739 else if (!strcmp (p, "-Wtrigraphs"))
740 ; /* cpp handles this one. */
741 else if (!strcmp (p, "-Wno-trigraphs"))
742 ; /* cpp handles this one. */
743 else if (!strcmp (p, "-Wundef"))
744 ; /* cpp handles this one. */
745 else if (!strcmp (p, "-Wno-undef"))
746 ; /* cpp handles this one. */
747 else if (!strcmp (p, "-Wimport"))
748 ; /* cpp handles this one. */
749 else if (!strcmp (p, "-Wno-import"))
750 ; /* cpp handles this one. */
751 else if (!strcmp (p, "-Wmissing-braces"))
752 warn_missing_braces = 1;
753 else if (!strcmp (p, "-Wno-missing-braces"))
754 warn_missing_braces = 0;
755 else if (!strcmp (p, "-Wmain"))
756 warn_main = 1;
757 else if (!strcmp (p, "-Wno-main"))
758 warn_main = -1;
759 else if (!strcmp (p, "-Wsign-compare"))
760 warn_sign_compare = 1;
761 else if (!strcmp (p, "-Wno-sign-compare"))
762 warn_sign_compare = 0;
763 else if (!strcmp (p, "-Wfloat-equal"))
764 warn_float_equal = 1;
765 else if (!strcmp (p, "-Wno-float-equal"))
766 warn_float_equal = 0;
767 else if (!strcmp (p, "-Wmultichar"))
768 warn_multichar = 1;
769 else if (!strcmp (p, "-Wno-multichar"))
770 warn_multichar = 0;
771 else if (!strcmp (p, "-Wdiv-by-zero"))
772 warn_div_by_zero = 1;
773 else if (!strcmp (p, "-Wno-div-by-zero"))
774 warn_div_by_zero = 0;
775 else if (!strcmp (p, "-Wunknown-pragmas"))
776 /* Set to greater than 1, so that even unknown pragmas in system
777 headers will be warned about. */
778 warn_unknown_pragmas = 2;
779 else if (!strcmp (p, "-Wno-unknown-pragmas"))
780 warn_unknown_pragmas = 0;
781 else if (!strcmp (p, "-Wall"))
783 /* We save the value of warn_uninitialized, since if they put
784 -Wuninitialized on the command line, we need to generate a
785 warning about not using it without also specifying -O. */
786 if (warn_uninitialized != 1)
787 warn_uninitialized = 2;
788 warn_implicit_int = 1;
789 mesg_implicit_function_declaration = 1;
790 warn_return_type = 1;
791 set_Wunused (1);
792 warn_switch = 1;
793 set_Wformat (1);
794 warn_char_subscripts = 1;
795 warn_parentheses = 1;
796 warn_sequence_point = 1;
797 warn_missing_braces = 1;
798 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
799 it off only if it's not explicit. */
800 warn_main = 2;
801 /* Only warn about unknown pragmas that are not in system headers. */
802 warn_unknown_pragmas = 1;
804 else
805 return strings_processed;
807 return 1;
810 void
811 c_print_identifier (file, node, indent)
812 FILE *file;
813 tree node;
814 int indent;
816 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
817 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
818 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
819 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
820 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
821 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
822 if (C_IS_RESERVED_WORD (node))
824 tree rid = ridpointers[C_RID_CODE (node)];
825 indent_to (file, indent + 4);
826 fprintf (file, "rid ");
827 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
828 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
832 /* Hook called at end of compilation to assume 1 elt
833 for a top-level tentative array defn that wasn't complete before. */
835 void
836 finish_incomplete_decl (decl)
837 tree decl;
839 if (TREE_CODE (decl) == VAR_DECL)
841 tree type = TREE_TYPE (decl);
842 if (type != error_mark_node
843 && TREE_CODE (type) == ARRAY_TYPE
844 && ! DECL_EXTERNAL (decl)
845 && TYPE_DOMAIN (type) == 0)
847 warning_with_decl (decl, "array `%s' assumed to have one element");
849 complete_array_type (type, NULL_TREE, 1);
851 layout_decl (decl, 0);
856 /* Create a new `struct binding_level'. */
858 static struct binding_level *
859 make_binding_level ()
861 /* NOSTRICT */
862 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
865 /* Nonzero if we are currently in the global binding level. */
868 global_bindings_p ()
870 return current_binding_level == global_binding_level;
873 void
874 keep_next_level ()
876 keep_next_level_flag = 1;
879 /* Nonzero if the current level needs to have a BLOCK made. */
882 kept_level_p ()
884 return ((current_binding_level->keep_if_subblocks
885 && current_binding_level->blocks != 0)
886 || current_binding_level->keep
887 || current_binding_level->names != 0
888 || (current_binding_level->tags != 0
889 && !current_binding_level->tag_transparent));
892 /* Identify this binding level as a level of parameters.
893 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
894 But it turns out there is no way to pass the right value for
895 DEFINITION_FLAG, so we ignore it. */
897 void
898 declare_parm_level (definition_flag)
899 int definition_flag ATTRIBUTE_UNUSED;
901 current_binding_level->parm_flag = 1;
904 /* Nonzero if currently making parm declarations. */
907 in_parm_level_p ()
909 return current_binding_level->parm_flag;
912 /* Enter a new binding level.
913 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
914 not for that of tags. */
916 void
917 pushlevel (tag_transparent)
918 int tag_transparent;
920 struct binding_level *newlevel = NULL_BINDING_LEVEL;
922 /* If this is the top level of a function,
923 just make sure that NAMED_LABELS is 0. */
925 if (current_binding_level == global_binding_level)
927 named_labels = 0;
930 /* Reuse or create a struct for this binding level. */
932 if (free_binding_level)
934 newlevel = free_binding_level;
935 free_binding_level = free_binding_level->level_chain;
937 else
939 newlevel = make_binding_level ();
942 /* Add this level to the front of the chain (stack) of levels that
943 are active. */
945 *newlevel = clear_binding_level;
946 newlevel->tag_transparent
947 = (tag_transparent
948 || (current_binding_level
949 ? current_binding_level->subblocks_tag_transparent
950 : 0));
951 newlevel->level_chain = current_binding_level;
952 current_binding_level = newlevel;
953 newlevel->keep = keep_next_level_flag;
954 keep_next_level_flag = 0;
955 newlevel->keep_if_subblocks = keep_next_if_subblocks;
956 keep_next_if_subblocks = 0;
959 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
961 static void
962 clear_limbo_values (block)
963 tree block;
965 tree tem;
967 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
968 if (DECL_NAME (tem) != 0)
969 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
971 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
972 clear_limbo_values (tem);
975 /* Exit a binding level.
976 Pop the level off, and restore the state of the identifier-decl mappings
977 that were in effect when this level was entered.
979 If KEEP is nonzero, this level had explicit declarations, so
980 and create a "block" (a BLOCK node) for the level
981 to record its declarations and subblocks for symbol table output.
983 If FUNCTIONBODY is nonzero, this level is the body of a function,
984 so create a block as if KEEP were set and also clear out all
985 label names.
987 If REVERSE is nonzero, reverse the order of decls before putting
988 them into the BLOCK. */
990 tree
991 poplevel (keep, reverse, functionbody)
992 int keep;
993 int reverse;
994 int functionbody;
996 tree link;
997 /* The chain of decls was accumulated in reverse order.
998 Put it into forward order, just for cleanliness. */
999 tree decls;
1000 tree tags = current_binding_level->tags;
1001 tree subblocks = current_binding_level->blocks;
1002 tree block = 0;
1003 tree decl;
1004 int block_previously_created;
1006 keep |= current_binding_level->keep;
1008 /* This warning is turned off because it causes warnings for
1009 declarations like `extern struct foo *x'. */
1010 #if 0
1011 /* Warn about incomplete structure types in this level. */
1012 for (link = tags; link; link = TREE_CHAIN (link))
1013 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
1015 tree type = TREE_VALUE (link);
1016 tree type_name = TYPE_NAME (type);
1017 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1018 ? type_name
1019 : DECL_NAME (type_name));
1020 switch (TREE_CODE (type))
1022 case RECORD_TYPE:
1023 error ("`struct %s' incomplete in scope ending here", id);
1024 break;
1025 case UNION_TYPE:
1026 error ("`union %s' incomplete in scope ending here", id);
1027 break;
1028 case ENUMERAL_TYPE:
1029 error ("`enum %s' incomplete in scope ending here", id);
1030 break;
1033 #endif /* 0 */
1035 /* Get the decls in the order they were written.
1036 Usually current_binding_level->names is in reverse order.
1037 But parameter decls were previously put in forward order. */
1039 if (reverse)
1040 current_binding_level->names
1041 = decls = nreverse (current_binding_level->names);
1042 else
1043 decls = current_binding_level->names;
1045 /* Output any nested inline functions within this block
1046 if they weren't already output. */
1048 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1049 if (TREE_CODE (decl) == FUNCTION_DECL
1050 && ! TREE_ASM_WRITTEN (decl)
1051 && DECL_INITIAL (decl) != 0
1052 && TREE_ADDRESSABLE (decl))
1054 /* If this decl was copied from a file-scope decl
1055 on account of a block-scope extern decl,
1056 propagate TREE_ADDRESSABLE to the file-scope decl.
1058 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1059 true, since then the decl goes through save_for_inline_copying. */
1060 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1061 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1062 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1065 /* We used to warn about unused variables in expand_end_bindings,
1066 i.e. while generating RTL. But in function-at-a-time mode we may
1067 choose to never expand a function at all (e.g. auto inlining), so
1068 we do this explicitly now. */
1069 warn_about_unused_variables (getdecls ());
1071 /* If there were any declarations or structure tags in that level,
1072 or if this level is a function body,
1073 create a BLOCK to record them for the life of this function. */
1075 block = 0;
1076 block_previously_created = (current_binding_level->this_block != 0);
1077 if (block_previously_created)
1078 block = current_binding_level->this_block;
1079 else if (keep || functionbody
1080 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1081 block = make_node (BLOCK);
1082 if (block != 0)
1084 BLOCK_VARS (block) = decls;
1085 BLOCK_SUBBLOCKS (block) = subblocks;
1088 /* In each subblock, record that this is its superior. */
1090 for (link = subblocks; link; link = TREE_CHAIN (link))
1091 BLOCK_SUPERCONTEXT (link) = block;
1093 /* Clear out the meanings of the local variables of this level. */
1095 for (link = decls; link; link = TREE_CHAIN (link))
1097 if (DECL_NAME (link) != 0)
1099 /* If the ident. was used or addressed via a local extern decl,
1100 don't forget that fact. */
1101 if (DECL_EXTERNAL (link))
1103 if (TREE_USED (link))
1104 TREE_USED (DECL_NAME (link)) = 1;
1105 if (TREE_ADDRESSABLE (link))
1106 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1108 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1112 /* Restore all name-meanings of the outer levels
1113 that were shadowed by this level. */
1115 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1116 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1118 /* If the level being exited is the top level of a function,
1119 check over all the labels, and clear out the current
1120 (function local) meanings of their names. */
1122 if (functionbody)
1124 clear_limbo_values (block);
1126 /* If this is the top level block of a function,
1127 the vars are the function's parameters.
1128 Don't leave them in the BLOCK because they are
1129 found in the FUNCTION_DECL instead. */
1131 BLOCK_VARS (block) = 0;
1133 /* Clear out the definitions of all label names,
1134 since their scopes end here,
1135 and add them to BLOCK_VARS. */
1137 for (link = named_labels; link; link = TREE_CHAIN (link))
1139 tree label = TREE_VALUE (link);
1141 if (DECL_INITIAL (label) == 0)
1143 error_with_decl (label, "label `%s' used but not defined");
1144 /* Avoid crashing later. */
1145 define_label (input_filename, lineno,
1146 DECL_NAME (label));
1148 else if (warn_unused_label && !TREE_USED (label))
1149 warning_with_decl (label, "label `%s' defined but not used");
1150 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1152 /* Put the labels into the "variables" of the
1153 top-level block, so debugger can see them. */
1154 TREE_CHAIN (label) = BLOCK_VARS (block);
1155 BLOCK_VARS (block) = label;
1159 /* Pop the current level, and free the structure for reuse. */
1162 struct binding_level *level = current_binding_level;
1163 current_binding_level = current_binding_level->level_chain;
1165 level->level_chain = free_binding_level;
1166 free_binding_level = level;
1169 /* Dispose of the block that we just made inside some higher level. */
1170 if (functionbody)
1171 DECL_INITIAL (current_function_decl) = block;
1172 else if (block)
1174 if (!block_previously_created)
1175 current_binding_level->blocks
1176 = chainon (current_binding_level->blocks, block);
1178 /* If we did not make a block for the level just exited,
1179 any blocks made for inner levels
1180 (since they cannot be recorded as subblocks in that level)
1181 must be carried forward so they will later become subblocks
1182 of something else. */
1183 else if (subblocks)
1184 current_binding_level->blocks
1185 = chainon (current_binding_level->blocks, subblocks);
1187 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1188 binding contour so that they point to the appropriate construct, i.e.
1189 either to the current FUNCTION_DECL node, or else to the BLOCK node
1190 we just constructed.
1192 Note that for tagged types whose scope is just the formal parameter
1193 list for some function type specification, we can't properly set
1194 their TYPE_CONTEXTs here, because we don't have a pointer to the
1195 appropriate FUNCTION_TYPE node readily available to us. For those
1196 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1197 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1198 node which will represent the "scope" for these "parameter list local"
1199 tagged types. */
1201 if (functionbody)
1202 for (link = tags; link; link = TREE_CHAIN (link))
1203 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1204 else if (block)
1205 for (link = tags; link; link = TREE_CHAIN (link))
1206 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1208 if (block)
1209 TREE_USED (block) = 1;
1211 return block;
1214 /* Insert BLOCK at the end of the list of subblocks of the
1215 current binding level. This is used when a BIND_EXPR is expanded,
1216 to handle the BLOCK node inside the BIND_EXPR. */
1218 void
1219 insert_block (block)
1220 tree block;
1222 TREE_USED (block) = 1;
1223 current_binding_level->blocks
1224 = chainon (current_binding_level->blocks, block);
1227 /* Set the BLOCK node for the innermost scope
1228 (the one we are currently in). */
1230 void
1231 set_block (block)
1232 tree block;
1234 current_binding_level->this_block = block;
1235 current_binding_level->names = chainon (current_binding_level->names,
1236 BLOCK_VARS (block));
1237 current_binding_level->blocks = chainon (current_binding_level->blocks,
1238 BLOCK_SUBBLOCKS (block));
1241 void
1242 push_label_level ()
1244 struct binding_level *newlevel;
1246 /* Reuse or create a struct for this binding level. */
1248 if (free_binding_level)
1250 newlevel = free_binding_level;
1251 free_binding_level = free_binding_level->level_chain;
1253 else
1255 newlevel = make_binding_level ();
1258 /* Add this level to the front of the chain (stack) of label levels. */
1260 newlevel->level_chain = label_level_chain;
1261 label_level_chain = newlevel;
1263 newlevel->names = named_labels;
1264 newlevel->shadowed = shadowed_labels;
1265 named_labels = 0;
1266 shadowed_labels = 0;
1269 void
1270 pop_label_level ()
1272 struct binding_level *level = label_level_chain;
1273 tree link, prev;
1275 /* Clear out the definitions of the declared labels in this level.
1276 Leave in the list any ordinary, non-declared labels. */
1277 for (link = named_labels, prev = 0; link;)
1279 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1281 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1283 error_with_decl (TREE_VALUE (link),
1284 "label `%s' used but not defined");
1285 /* Avoid crashing later. */
1286 define_label (input_filename, lineno,
1287 DECL_NAME (TREE_VALUE (link)));
1289 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1290 warning_with_decl (TREE_VALUE (link),
1291 "label `%s' defined but not used");
1292 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1294 /* Delete this element from the list. */
1295 link = TREE_CHAIN (link);
1296 if (prev)
1297 TREE_CHAIN (prev) = link;
1298 else
1299 named_labels = link;
1301 else
1303 prev = link;
1304 link = TREE_CHAIN (link);
1308 /* Bring back all the labels that were shadowed. */
1309 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1310 if (DECL_NAME (TREE_VALUE (link)) != 0)
1311 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1312 = TREE_VALUE (link);
1314 named_labels = chainon (named_labels, level->names);
1315 shadowed_labels = level->shadowed;
1317 /* Pop the current level, and free the structure for reuse. */
1318 label_level_chain = label_level_chain->level_chain;
1319 level->level_chain = free_binding_level;
1320 free_binding_level = level;
1323 /* Push a definition or a declaration of struct, union or enum tag "name".
1324 "type" should be the type node.
1325 We assume that the tag "name" is not already defined.
1327 Note that the definition may really be just a forward reference.
1328 In that case, the TYPE_SIZE will be zero. */
1330 void
1331 pushtag (name, type)
1332 tree name, type;
1334 struct binding_level *b;
1336 /* Find the proper binding level for this type tag. */
1338 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1339 continue;
1341 if (name)
1343 /* Record the identifier as the type's name if it has none. */
1345 if (TYPE_NAME (type) == 0)
1346 TYPE_NAME (type) = name;
1349 b->tags = tree_cons (name, type, b->tags);
1351 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1352 tagged type we just added to the current binding level. This fake
1353 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1354 to output a representation of a tagged type, and it also gives
1355 us a convenient place to record the "scope start" address for the
1356 tagged type. */
1358 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1360 /* An approximation for now, so we can tell this is a function-scope tag.
1361 This will be updated in poplevel. */
1362 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1365 /* Handle when a new declaration NEWDECL
1366 has the same name as an old one OLDDECL
1367 in the same binding contour.
1368 Prints an error message if appropriate.
1370 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1371 Otherwise, return 0.
1373 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1374 and OLDDECL is in an outer binding level and should thus not be changed. */
1376 static int
1377 duplicate_decls (newdecl, olddecl, different_binding_level)
1378 tree newdecl, olddecl;
1379 int different_binding_level;
1381 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1382 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1383 && DECL_INITIAL (newdecl) != 0);
1384 tree oldtype = TREE_TYPE (olddecl);
1385 tree newtype = TREE_TYPE (newdecl);
1386 int errmsg = 0;
1388 if (DECL_P (olddecl))
1390 if (TREE_CODE (newdecl) == FUNCTION_DECL
1391 && TREE_CODE (olddecl) == FUNCTION_DECL
1392 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1394 if (DECL_DECLARED_INLINE_P (newdecl)
1395 && DECL_UNINLINABLE (newdecl)
1396 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1397 /* Already warned elsewhere. */;
1398 else if (DECL_DECLARED_INLINE_P (olddecl)
1399 && DECL_UNINLINABLE (olddecl)
1400 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1401 /* Already warned. */;
1402 else if (DECL_DECLARED_INLINE_P (newdecl)
1403 && ! DECL_DECLARED_INLINE_P (olddecl)
1404 && DECL_UNINLINABLE (olddecl)
1405 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1407 warning_with_decl (newdecl,
1408 "function `%s' redeclared as inline");
1409 warning_with_decl (olddecl,
1410 "previous declaration of function `%s' with attribute noinline");
1412 else if (DECL_DECLARED_INLINE_P (olddecl)
1413 && DECL_UNINLINABLE (newdecl)
1414 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1416 warning_with_decl (newdecl,
1417 "function `%s' redeclared with attribute noinline");
1418 warning_with_decl (olddecl,
1419 "previous declaration of function `%s' was inline");
1423 DECL_ATTRIBUTES (newdecl)
1424 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1427 if (TREE_CODE (newtype) == ERROR_MARK
1428 || TREE_CODE (oldtype) == ERROR_MARK)
1429 types_match = 0;
1431 /* New decl is completely inconsistent with the old one =>
1432 tell caller to replace the old one.
1433 This is always an error except in the case of shadowing a builtin. */
1434 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1436 if (TREE_CODE (olddecl) == FUNCTION_DECL
1437 && (DECL_BUILT_IN (olddecl)
1438 || DECL_BUILT_IN_NONANSI (olddecl)))
1440 /* If you declare a built-in or predefined function name as static,
1441 the old definition is overridden,
1442 but optionally warn this was a bad choice of name. */
1443 if (!TREE_PUBLIC (newdecl))
1445 if (!warn_shadow)
1447 else if (DECL_BUILT_IN (olddecl))
1448 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1449 else
1450 warning_with_decl (newdecl, "shadowing library function `%s'");
1452 /* Likewise, if the built-in is not ansi, then programs can
1453 override it even globally without an error. */
1454 else if (! DECL_BUILT_IN (olddecl))
1455 warning_with_decl (newdecl,
1456 "library function `%s' declared as non-function");
1458 else if (DECL_BUILT_IN_NONANSI (olddecl))
1459 warning_with_decl (newdecl,
1460 "built-in function `%s' declared as non-function");
1461 else
1462 warning_with_decl (newdecl,
1463 "built-in function `%s' declared as non-function");
1465 else
1467 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1468 error_with_decl (olddecl, "previous declaration of `%s'");
1471 return 0;
1474 /* For real parm decl following a forward decl,
1475 return 1 so old decl will be reused. */
1476 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1477 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1478 return 1;
1480 /* The new declaration is the same kind of object as the old one.
1481 The declarations may partially match. Print warnings if they don't
1482 match enough. Ultimately, copy most of the information from the new
1483 decl to the old one, and keep using the old one. */
1485 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1486 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1487 && DECL_INITIAL (olddecl) == 0)
1488 /* If -traditional, avoid error for redeclaring fcn
1489 after implicit decl. */
1491 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1492 && DECL_BUILT_IN (olddecl))
1494 /* A function declaration for a built-in function. */
1495 if (!TREE_PUBLIC (newdecl))
1497 /* If you declare a built-in function name as static, the
1498 built-in definition is overridden,
1499 but optionally warn this was a bad choice of name. */
1500 if (warn_shadow)
1501 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1502 /* Discard the old built-in function. */
1503 return 0;
1505 else if (!types_match)
1507 /* Accept the return type of the new declaration if same modes. */
1508 tree oldreturntype = TREE_TYPE (oldtype);
1509 tree newreturntype = TREE_TYPE (newtype);
1511 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1513 /* Function types may be shared, so we can't just modify
1514 the return type of olddecl's function type. */
1515 tree trytype
1516 = build_function_type (newreturntype,
1517 TYPE_ARG_TYPES (oldtype));
1518 trytype = build_type_attribute_variant (trytype,
1519 TYPE_ATTRIBUTES (oldtype));
1521 types_match = comptypes (newtype, trytype);
1522 if (types_match)
1523 oldtype = trytype;
1525 /* Accept harmless mismatch in first argument type also.
1526 This is for the ffs and fprintf builtins. */
1527 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1528 && TYPE_ARG_TYPES (oldtype) != 0
1529 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1530 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1531 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1532 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1534 /* Function types may be shared, so we can't just modify
1535 the return type of olddecl's function type. */
1536 tree trytype
1537 = build_function_type (TREE_TYPE (oldtype),
1538 tree_cons (NULL_TREE,
1539 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1540 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1541 trytype = build_type_attribute_variant (trytype,
1542 TYPE_ATTRIBUTES (oldtype));
1544 types_match = comptypes (newtype, trytype);
1545 if (types_match)
1546 oldtype = trytype;
1548 if (! different_binding_level)
1549 TREE_TYPE (olddecl) = oldtype;
1551 else if (TYPE_ARG_TYPES (oldtype) == NULL
1552 && TYPE_ARG_TYPES (newtype) != NULL)
1554 /* For bcmp, bzero, fputs the builtin type has arguments not
1555 specified. Use the ones from the prototype so that type checking
1556 is done for them. */
1557 tree trytype
1558 = build_function_type (TREE_TYPE (oldtype),
1559 TYPE_ARG_TYPES (newtype));
1560 trytype = build_type_attribute_variant (trytype,
1561 TYPE_ATTRIBUTES (oldtype));
1563 oldtype = trytype;
1564 if (! different_binding_level)
1565 TREE_TYPE (olddecl) = oldtype;
1567 if (!types_match)
1569 /* If types don't match for a built-in, throw away the built-in. */
1570 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1571 return 0;
1574 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1575 && DECL_SOURCE_LINE (olddecl) == 0)
1577 /* A function declaration for a predeclared function
1578 that isn't actually built in. */
1579 if (!TREE_PUBLIC (newdecl))
1581 /* If you declare it as static, the
1582 default definition is overridden. */
1583 return 0;
1585 else if (!types_match)
1587 /* If the types don't match, preserve volatility indication.
1588 Later on, we will discard everything else about the
1589 default declaration. */
1590 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1593 /* Permit char *foo () to match void *foo (...) if not pedantic,
1594 if one of them came from a system header file. */
1595 else if (!types_match
1596 && TREE_CODE (olddecl) == FUNCTION_DECL
1597 && TREE_CODE (newdecl) == FUNCTION_DECL
1598 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1599 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1600 && (DECL_IN_SYSTEM_HEADER (olddecl)
1601 || DECL_IN_SYSTEM_HEADER (newdecl))
1602 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1603 && TYPE_ARG_TYPES (oldtype) == 0
1604 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1605 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1607 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1608 && TYPE_ARG_TYPES (newtype) == 0
1609 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1610 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1612 if (pedantic)
1613 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1614 /* Make sure we keep void * as ret type, not char *. */
1615 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1616 TREE_TYPE (newdecl) = newtype = oldtype;
1618 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1619 we will come back here again. */
1620 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1622 else if (!types_match
1623 /* Permit char *foo (int, ...); followed by char *foo ();
1624 if not pedantic. */
1625 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1626 && ! pedantic
1627 /* Return types must still match. */
1628 && comptypes (TREE_TYPE (oldtype),
1629 TREE_TYPE (newtype))
1630 && TYPE_ARG_TYPES (newtype) == 0))
1632 error_with_decl (newdecl, "conflicting types for `%s'");
1633 /* Check for function type mismatch
1634 involving an empty arglist vs a nonempty one. */
1635 if (TREE_CODE (olddecl) == FUNCTION_DECL
1636 && comptypes (TREE_TYPE (oldtype),
1637 TREE_TYPE (newtype))
1638 && ((TYPE_ARG_TYPES (oldtype) == 0
1639 && DECL_INITIAL (olddecl) == 0)
1641 (TYPE_ARG_TYPES (newtype) == 0
1642 && DECL_INITIAL (newdecl) == 0)))
1644 /* Classify the problem further. */
1645 tree t = TYPE_ARG_TYPES (oldtype);
1646 if (t == 0)
1647 t = TYPE_ARG_TYPES (newtype);
1648 for (; t; t = TREE_CHAIN (t))
1650 tree type = TREE_VALUE (t);
1652 if (TREE_CHAIN (t) == 0
1653 && TYPE_MAIN_VARIANT (type) != void_type_node)
1655 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1656 break;
1659 if (simple_type_promotes_to (type) != NULL_TREE)
1661 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1662 break;
1666 error_with_decl (olddecl, "previous declaration of `%s'");
1668 else
1670 errmsg = redeclaration_error_message (newdecl, olddecl);
1671 if (errmsg)
1673 switch (errmsg)
1675 case 1:
1676 error_with_decl (newdecl, "redefinition of `%s'");
1677 break;
1678 case 2:
1679 error_with_decl (newdecl, "redeclaration of `%s'");
1680 break;
1681 case 3:
1682 error_with_decl (newdecl, "conflicting declarations of `%s'");
1683 break;
1684 default:
1685 abort ();
1688 error_with_decl (olddecl,
1689 ((DECL_INITIAL (olddecl)
1690 && current_binding_level == global_binding_level)
1691 ? "`%s' previously defined here"
1692 : "`%s' previously declared here"));
1694 else if (TREE_CODE (newdecl) == TYPE_DECL
1695 && (DECL_IN_SYSTEM_HEADER (olddecl)
1696 || DECL_IN_SYSTEM_HEADER (newdecl)))
1698 warning_with_decl (newdecl, "redefinition of `%s'");
1699 warning_with_decl
1700 (olddecl,
1701 ((DECL_INITIAL (olddecl)
1702 && current_binding_level == global_binding_level)
1703 ? "`%s' previously defined here"
1704 : "`%s' previously declared here"));
1706 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1707 && DECL_INITIAL (olddecl) != 0
1708 && TYPE_ARG_TYPES (oldtype) == 0
1709 && TYPE_ARG_TYPES (newtype) != 0
1710 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1712 tree type, parm;
1713 int nargs;
1714 /* Prototype decl follows defn w/o prototype. */
1716 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1717 type = TYPE_ARG_TYPES (newtype),
1718 nargs = 1;
1720 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1722 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1723 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1725 warning_with_decl (newdecl, "prototype for `%s' follows");
1726 warning_with_decl (olddecl, "non-prototype definition here");
1727 break;
1729 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1730 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1732 error_with_decl (newdecl,
1733 "prototype for `%s' follows and number of arguments doesn't match");
1734 error_with_decl (olddecl, "non-prototype definition here");
1735 errmsg = 1;
1736 break;
1738 /* Type for passing arg must be consistent
1739 with that declared for the arg. */
1740 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1741 /* If -traditional, allow `unsigned int' instead of `int'
1742 in the prototype. */
1743 && (! (flag_traditional
1744 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1745 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1747 error_with_decl (newdecl,
1748 "prototype for `%s' follows and argument %d doesn't match",
1749 nargs);
1750 error_with_decl (olddecl, "non-prototype definition here");
1751 errmsg = 1;
1752 break;
1756 /* Warn about mismatches in various flags. */
1757 else
1759 /* Warn if function is now inline
1760 but was previously declared not inline and has been called. */
1761 if (TREE_CODE (olddecl) == FUNCTION_DECL
1762 && ! DECL_DECLARED_INLINE_P (olddecl)
1763 && DECL_DECLARED_INLINE_P (newdecl)
1764 && TREE_USED (olddecl))
1765 warning_with_decl (newdecl,
1766 "`%s' declared inline after being called");
1767 if (TREE_CODE (olddecl) == FUNCTION_DECL
1768 && ! DECL_DECLARED_INLINE_P (olddecl)
1769 && DECL_DECLARED_INLINE_P (newdecl)
1770 && DECL_INITIAL (olddecl) != 0)
1771 warning_with_decl (newdecl,
1772 "`%s' declared inline after its definition");
1774 /* If pedantic, warn when static declaration follows a non-static
1775 declaration. Otherwise, do so only for functions. */
1776 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1777 && TREE_PUBLIC (olddecl)
1778 && !TREE_PUBLIC (newdecl))
1779 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1781 /* If warn_traditional, warn when a non-static function
1782 declaration follows a static one. */
1783 if (warn_traditional && !in_system_header
1784 && TREE_CODE (olddecl) == FUNCTION_DECL
1785 && !TREE_PUBLIC (olddecl)
1786 && TREE_PUBLIC (newdecl))
1787 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1789 /* Warn when const declaration follows a non-const
1790 declaration, but not for functions. */
1791 if (TREE_CODE (olddecl) != FUNCTION_DECL
1792 && !TREE_READONLY (olddecl)
1793 && TREE_READONLY (newdecl))
1794 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1795 /* These bits are logically part of the type, for variables.
1796 But not for functions
1797 (where qualifiers are not valid ANSI anyway). */
1798 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1799 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1800 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1801 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1805 /* Optionally warn about more than one declaration for the same name. */
1806 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1807 /* Don't warn about a function declaration
1808 followed by a definition. */
1809 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1810 && DECL_INITIAL (olddecl) == 0)
1811 /* Don't warn about extern decl followed by (tentative) definition. */
1812 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1814 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1815 warning_with_decl (olddecl, "previous declaration of `%s'");
1818 /* Copy all the DECL_... slots specified in the new decl
1819 except for any that we copy here from the old type.
1821 Past this point, we don't change OLDTYPE and NEWTYPE
1822 even if we change the types of NEWDECL and OLDDECL. */
1824 if (types_match)
1826 /* When copying info to olddecl, we store into write_olddecl
1827 instead. This allows us to avoid modifying olddecl when
1828 different_binding_level is true. */
1829 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1831 /* Merge the data types specified in the two decls. */
1832 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1834 if (different_binding_level)
1836 if (TYPE_ARG_TYPES (oldtype) != 0
1837 && TYPE_ARG_TYPES (newtype) == 0)
1838 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1839 else
1840 TREE_TYPE (newdecl)
1841 = build_type_attribute_variant
1842 (newtype,
1843 merge_attributes (TYPE_ATTRIBUTES (newtype),
1844 TYPE_ATTRIBUTES (oldtype)));
1846 else
1847 TREE_TYPE (newdecl)
1848 = TREE_TYPE (olddecl)
1849 = common_type (newtype, oldtype);
1852 /* Lay the type out, unless already done. */
1853 if (oldtype != TREE_TYPE (newdecl))
1855 if (TREE_TYPE (newdecl) != error_mark_node)
1856 layout_type (TREE_TYPE (newdecl));
1857 if (TREE_CODE (newdecl) != FUNCTION_DECL
1858 && TREE_CODE (newdecl) != TYPE_DECL
1859 && TREE_CODE (newdecl) != CONST_DECL)
1860 layout_decl (newdecl, 0);
1862 else
1864 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1865 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1866 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1867 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1868 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1869 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1871 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1872 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1876 /* Keep the old rtl since we can safely use it. */
1877 COPY_DECL_RTL (olddecl, newdecl);
1879 /* Merge the type qualifiers. */
1880 if (TREE_CODE (olddecl) == FUNCTION_DECL
1881 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1882 && ! TREE_THIS_VOLATILE (newdecl))
1883 TREE_THIS_VOLATILE (write_olddecl) = 0;
1885 if (TREE_READONLY (newdecl))
1886 TREE_READONLY (write_olddecl) = 1;
1888 if (TREE_THIS_VOLATILE (newdecl))
1890 TREE_THIS_VOLATILE (write_olddecl) = 1;
1891 if (TREE_CODE (newdecl) == VAR_DECL
1892 /* If an automatic variable is re-declared in the same
1893 function scope, but the old declaration was not
1894 volatile, make_var_volatile() would crash because the
1895 variable would have been assigned to a pseudo, not a
1896 MEM. Since this duplicate declaration is invalid
1897 anyway, we just skip the call. */
1898 && errmsg == 0)
1899 make_var_volatile (newdecl);
1902 /* Keep source location of definition rather than declaration. */
1903 /* When called with different_binding_level set, keep the old
1904 information so that meaningful diagnostics can be given. */
1905 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1906 && ! different_binding_level)
1908 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1909 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1912 /* Merge the unused-warning information. */
1913 if (DECL_IN_SYSTEM_HEADER (olddecl))
1914 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1915 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1916 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1918 /* Merge the initialization information. */
1919 /* When called with different_binding_level set, don't copy over
1920 DECL_INITIAL, so that we don't accidentally change function
1921 declarations into function definitions. */
1922 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1923 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1925 /* Merge the section attribute.
1926 We want to issue an error if the sections conflict but that must be
1927 done later in decl_attributes since we are called before attributes
1928 are assigned. */
1929 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1930 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1932 /* Copy the assembler name.
1933 Currently, it can only be defined in the prototype. */
1934 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1936 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1938 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1939 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1940 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1941 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1942 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1945 /* If cannot merge, then use the new type and qualifiers,
1946 and don't preserve the old rtl. */
1947 else if (! different_binding_level)
1949 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1950 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1951 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1952 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1955 /* Merge the storage class information. */
1956 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1957 /* For functions, static overrides non-static. */
1958 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1960 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1961 /* This is since we don't automatically
1962 copy the attributes of NEWDECL into OLDDECL. */
1963 /* No need to worry about different_binding_level here because
1964 then TREE_PUBLIC (newdecl) was true. */
1965 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1966 /* If this clears `static', clear it in the identifier too. */
1967 if (! TREE_PUBLIC (olddecl))
1968 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1970 if (DECL_EXTERNAL (newdecl))
1972 if (! different_binding_level)
1974 /* Don't mess with these flags on local externs; they remain
1975 external even if there's a declaration at file scope which
1976 isn't. */
1977 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1978 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1980 /* An extern decl does not override previous storage class. */
1981 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1982 if (! DECL_EXTERNAL (newdecl))
1983 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1985 else
1987 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1988 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1991 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1993 /* If we're redefining a function previously defined as extern
1994 inline, make sure we emit debug info for the inline before we
1995 throw it away, in case it was inlined into a function that hasn't
1996 been written out yet. */
1997 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1999 (*debug_hooks->outlining_inline_function) (olddecl);
2001 /* The new defn must not be inline. */
2002 DECL_INLINE (newdecl) = 0;
2003 DECL_UNINLINABLE (newdecl) = 1;
2005 else
2007 /* If either decl says `inline', this fn is inline,
2008 unless its definition was passed already. */
2009 if (DECL_DECLARED_INLINE_P (newdecl)
2010 || DECL_DECLARED_INLINE_P (olddecl))
2011 DECL_DECLARED_INLINE_P (newdecl) = 1;
2013 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
2014 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
2017 if (DECL_BUILT_IN (olddecl))
2019 /* Get rid of any built-in function if new arg types don't match it
2020 or if we have a function definition. */
2021 if (! types_match || new_is_definition)
2023 if (! different_binding_level)
2025 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2026 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
2029 else
2031 /* If redeclaring a builtin function, and not a definition,
2032 it stays built in. */
2033 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
2034 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2038 /* Also preserve various other info from the definition. */
2039 if (! new_is_definition)
2041 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2042 /* When called with different_binding_level set, don't copy over
2043 DECL_INITIAL, so that we don't accidentally change function
2044 declarations into function definitions. */
2045 if (! different_binding_level)
2046 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2047 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2048 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
2049 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
2050 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2052 /* Set DECL_INLINE on the declaration if we've got a body
2053 from which to instantiate. */
2054 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
2056 DECL_INLINE (newdecl) = 1;
2057 DECL_ABSTRACT_ORIGIN (newdecl)
2058 = (different_binding_level
2059 ? DECL_ORIGIN (olddecl)
2060 : DECL_ABSTRACT_ORIGIN (olddecl));
2063 else
2065 /* If a previous declaration said inline, mark the
2066 definition as inlinable. */
2067 if (DECL_DECLARED_INLINE_P (newdecl)
2068 && ! DECL_UNINLINABLE (newdecl))
2069 DECL_INLINE (newdecl) = 1;
2072 if (different_binding_level)
2073 return 0;
2075 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2076 But preserve OLDDECL's DECL_UID. */
2078 unsigned olddecl_uid = DECL_UID (olddecl);
2080 memcpy ((char *) olddecl + sizeof (struct tree_common),
2081 (char *) newdecl + sizeof (struct tree_common),
2082 sizeof (struct tree_decl) - sizeof (struct tree_common));
2083 DECL_UID (olddecl) = olddecl_uid;
2086 /* NEWDECL contains the merged attribute lists.
2087 Update OLDDECL to be the same. */
2088 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
2090 return 1;
2093 /* Check whether decl-node X shadows an existing declaration.
2094 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
2095 which might be a NULL_TREE. */
2096 static void
2097 warn_if_shadowing (x, oldlocal)
2098 tree x, oldlocal;
2100 tree name;
2102 if (DECL_EXTERNAL (x))
2103 return;
2105 name = DECL_NAME (x);
2107 /* Warn if shadowing an argument at the top level of the body. */
2108 if (oldlocal != 0
2109 /* This warning doesn't apply to the parms of a nested fcn. */
2110 && ! current_binding_level->parm_flag
2111 /* Check that this is one level down from the parms. */
2112 && current_binding_level->level_chain->parm_flag
2113 /* Check that the decl being shadowed
2114 comes from the parm level, one level up. */
2115 && chain_member (oldlocal, current_binding_level->level_chain->names))
2117 if (TREE_CODE (oldlocal) == PARM_DECL)
2118 pedwarn ("declaration of `%s' shadows a parameter",
2119 IDENTIFIER_POINTER (name));
2120 else
2121 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2122 IDENTIFIER_POINTER (name));
2124 /* Maybe warn if shadowing something else. */
2125 else if (warn_shadow
2126 /* No shadow warnings for internally generated vars. */
2127 && DECL_SOURCE_LINE (x) != 0
2128 /* No shadow warnings for vars made for inlining. */
2129 && ! DECL_FROM_INLINE (x))
2131 if (TREE_CODE (x) == PARM_DECL
2132 && current_binding_level->level_chain->parm_flag)
2133 /* Don't warn about the parm names in function declarator
2134 within a function declarator.
2135 It would be nice to avoid warning in any function
2136 declarator in a declaration, as opposed to a definition,
2137 but there is no way to tell it's not a definition. */
2139 else if (oldlocal)
2141 if (TREE_CODE (oldlocal) == PARM_DECL)
2142 shadow_warning ("a parameter", name, oldlocal);
2143 else
2144 shadow_warning ("a previous local", name, oldlocal);
2146 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2147 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2148 shadow_warning ("a global declaration", name,
2149 IDENTIFIER_GLOBAL_VALUE (name));
2153 /* Record a decl-node X as belonging to the current lexical scope.
2154 Check for errors (such as an incompatible declaration for the same
2155 name already seen in the same scope).
2157 Returns either X or an old decl for the same name.
2158 If an old decl is returned, it may have been smashed
2159 to agree with what X says. */
2161 tree
2162 pushdecl (x)
2163 tree x;
2165 tree t;
2166 tree name = DECL_NAME (x);
2167 struct binding_level *b = current_binding_level;
2169 /* Functions need the lang_decl data. */
2170 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2171 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2172 ggc_alloc_cleared (sizeof (struct lang_decl));
2174 DECL_CONTEXT (x) = current_function_decl;
2175 /* A local extern declaration for a function doesn't constitute nesting.
2176 A local auto declaration does, since it's a forward decl
2177 for a nested function coming later. */
2178 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2179 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2180 DECL_CONTEXT (x) = 0;
2182 if (name)
2184 int different_binding_level = 0;
2186 if (warn_nested_externs
2187 && DECL_EXTERNAL (x)
2188 && b != global_binding_level
2189 && x != IDENTIFIER_IMPLICIT_DECL (name)
2190 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2191 && !DECL_IN_SYSTEM_HEADER (x))
2192 warning ("nested extern declaration of `%s'",
2193 IDENTIFIER_POINTER (name));
2195 t = lookup_name_current_level (name);
2196 /* Don't type check externs here when -traditional. This is so that
2197 code with conflicting declarations inside blocks will get warnings
2198 not errors. X11 for instance depends on this. */
2199 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2201 t = lookup_name (name);
2202 /* Type decls at global scope don't conflict with externs declared
2203 inside lexical blocks. */
2204 if (t && TREE_CODE (t) == TYPE_DECL)
2205 t = 0;
2206 different_binding_level = 1;
2208 if (t != 0 && t == error_mark_node)
2209 /* error_mark_node is 0 for a while during initialization! */
2211 t = 0;
2212 error_with_decl (x, "`%s' used prior to declaration");
2215 /* If this decl is `static' and an implicit decl was seen previously,
2216 warn. But don't complain if -traditional,
2217 since traditional compilers don't complain. */
2218 if (! flag_traditional && TREE_PUBLIC (name)
2219 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2220 sets this for all functions. */
2221 && ! TREE_PUBLIC (x)
2222 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2223 /* We used to warn also for explicit extern followed by static,
2224 but sometimes you need to do it that way. */
2225 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2227 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2228 IDENTIFIER_POINTER (name));
2229 pedwarn_with_file_and_line
2230 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2231 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2232 "previous declaration of `%s'",
2233 IDENTIFIER_POINTER (name));
2234 TREE_THIS_VOLATILE (name) = 1;
2237 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2239 if (TREE_CODE (t) == PARM_DECL)
2241 /* Don't allow more than one "real" duplicate
2242 of a forward parm decl. */
2243 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2244 return t;
2246 return t;
2249 /* If we are processing a typedef statement, generate a whole new
2250 ..._TYPE node (which will be just an variant of the existing
2251 ..._TYPE node with identical properties) and then install the
2252 TYPE_DECL node generated to represent the typedef name as the
2253 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2255 The whole point here is to end up with a situation where each
2256 and every ..._TYPE node the compiler creates will be uniquely
2257 associated with AT MOST one node representing a typedef name.
2258 This way, even though the compiler substitutes corresponding
2259 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2260 early on, later parts of the compiler can always do the reverse
2261 translation and get back the corresponding typedef name. For
2262 example, given:
2264 typedef struct S MY_TYPE;
2265 MY_TYPE object;
2267 Later parts of the compiler might only know that `object' was of
2268 type `struct S' if it were not for code just below. With this
2269 code however, later parts of the compiler see something like:
2271 struct S' == struct S
2272 typedef struct S' MY_TYPE;
2273 struct S' object;
2275 And they can then deduce (from the node for type struct S') that
2276 the original object declaration was:
2278 MY_TYPE object;
2280 Being able to do this is important for proper support of protoize,
2281 and also for generating precise symbolic debugging information
2282 which takes full account of the programmer's (typedef) vocabulary.
2284 Obviously, we don't want to generate a duplicate ..._TYPE node if
2285 the TYPE_DECL node that we are now processing really represents a
2286 standard built-in type.
2288 Since all standard types are effectively declared at line zero
2289 in the source file, we can easily check to see if we are working
2290 on a standard type by checking the current value of lineno. */
2292 if (TREE_CODE (x) == TYPE_DECL)
2294 if (DECL_SOURCE_LINE (x) == 0)
2296 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2297 TYPE_NAME (TREE_TYPE (x)) = x;
2299 else if (TREE_TYPE (x) != error_mark_node
2300 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2302 tree tt = TREE_TYPE (x);
2303 DECL_ORIGINAL_TYPE (x) = tt;
2304 tt = build_type_copy (tt);
2305 TYPE_NAME (tt) = x;
2306 TREE_USED (tt) = TREE_USED (x);
2307 TREE_TYPE (x) = tt;
2311 /* Multiple external decls of the same identifier ought to match.
2312 Check against both global declarations (when traditional) and out of
2313 scope (limbo) block level declarations.
2315 We get warnings about inline functions where they are defined.
2316 Avoid duplicate warnings where they are used. */
2317 if (TREE_PUBLIC (x)
2318 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2320 tree decl;
2322 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2323 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2324 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2325 decl = IDENTIFIER_GLOBAL_VALUE (name);
2326 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2327 /* Decls in limbo are always extern, so no need to check that. */
2328 decl = IDENTIFIER_LIMBO_VALUE (name);
2329 else
2330 decl = 0;
2332 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2333 /* If old decl is built-in, we already warned if we should. */
2334 && !DECL_BUILT_IN (decl))
2336 pedwarn_with_decl (x,
2337 "type mismatch with previous external decl");
2338 pedwarn_with_decl (decl, "previous external decl of `%s'");
2342 /* If a function has had an implicit declaration, and then is defined,
2343 make sure they are compatible. */
2345 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2346 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2347 && TREE_CODE (x) == FUNCTION_DECL
2348 && ! comptypes (TREE_TYPE (x),
2349 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2351 warning_with_decl (x, "type mismatch with previous implicit declaration");
2352 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2353 "previous implicit declaration of `%s'");
2356 /* In PCC-compatibility mode, extern decls of vars with no current decl
2357 take effect at top level no matter where they are. */
2358 if (flag_traditional && DECL_EXTERNAL (x)
2359 && lookup_name (name) == 0)
2361 tree type = TREE_TYPE (x);
2363 /* But don't do this if the type contains temporary nodes. */
2364 while (type)
2366 if (type == error_mark_node)
2367 break;
2368 if (TYPE_CONTEXT (type))
2370 warning_with_decl (x, "type of external `%s' is not global");
2371 /* By exiting the loop early, we leave TYPE nonzero,
2372 and thus prevent globalization of the decl. */
2373 break;
2375 else if (TREE_CODE (type) == FUNCTION_TYPE
2376 && TYPE_ARG_TYPES (type) != 0)
2377 /* The types might not be truly local,
2378 but the list of arg types certainly is temporary.
2379 Since prototypes are nontraditional,
2380 ok not to do the traditional thing. */
2381 break;
2382 type = TREE_TYPE (type);
2385 if (type == 0)
2386 b = global_binding_level;
2389 /* This name is new in its binding level.
2390 Install the new declaration and return it. */
2391 if (b == global_binding_level)
2393 /* Install a global value. */
2395 /* If the first global decl has external linkage,
2396 warn if we later see static one. */
2397 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2398 TREE_PUBLIC (name) = 1;
2400 IDENTIFIER_GLOBAL_VALUE (name) = x;
2402 /* We no longer care about any previous block level declarations. */
2403 IDENTIFIER_LIMBO_VALUE (name) = 0;
2405 /* Don't forget if the function was used via an implicit decl. */
2406 if (IDENTIFIER_IMPLICIT_DECL (name)
2407 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2408 TREE_USED (x) = 1, TREE_USED (name) = 1;
2410 /* Don't forget if its address was taken in that way. */
2411 if (IDENTIFIER_IMPLICIT_DECL (name)
2412 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2413 TREE_ADDRESSABLE (x) = 1;
2415 /* Warn about mismatches against previous implicit decl. */
2416 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2417 /* If this real decl matches the implicit, don't complain. */
2418 && ! (TREE_CODE (x) == FUNCTION_DECL
2419 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2420 == integer_type_node)))
2421 pedwarn ("`%s' was previously implicitly declared to return `int'",
2422 IDENTIFIER_POINTER (name));
2424 /* If this decl is `static' and an `extern' was seen previously,
2425 that is erroneous. */
2426 if (TREE_PUBLIC (name)
2427 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2429 /* Okay to redeclare an ANSI built-in as static. */
2430 if (t != 0 && DECL_BUILT_IN (t))
2432 /* Okay to declare a non-ANSI built-in as anything. */
2433 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2435 /* Okay to have global type decl after an earlier extern
2436 declaration inside a lexical block. */
2437 else if (TREE_CODE (x) == TYPE_DECL)
2439 else if (IDENTIFIER_IMPLICIT_DECL (name))
2441 if (! TREE_THIS_VOLATILE (name))
2442 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2443 IDENTIFIER_POINTER (name));
2445 else
2446 pedwarn ("`%s' was declared `extern' and later `static'",
2447 IDENTIFIER_POINTER (name));
2450 else
2452 /* Here to install a non-global value. */
2453 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2454 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2456 IDENTIFIER_LOCAL_VALUE (name) = x;
2458 /* If this is an extern function declaration, see if we
2459 have a global definition or declaration for the function. */
2460 if (oldlocal == 0
2461 && oldglobal != 0
2462 && TREE_CODE (x) == FUNCTION_DECL
2463 && TREE_CODE (oldglobal) == FUNCTION_DECL
2464 && DECL_EXTERNAL (x)
2465 && ! DECL_DECLARED_INLINE_P (x))
2467 /* We have one. Their types must agree. */
2468 if (! comptypes (TREE_TYPE (x),
2469 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2470 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2471 else
2473 /* Inner extern decl is inline if global one is.
2474 Copy enough to really inline it. */
2475 if (DECL_DECLARED_INLINE_P (oldglobal))
2477 DECL_DECLARED_INLINE_P (x)
2478 = DECL_DECLARED_INLINE_P (oldglobal);
2479 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2480 DECL_INITIAL (x) = (current_function_decl == oldglobal
2481 ? 0 : DECL_INITIAL (oldglobal));
2482 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2483 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2484 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2485 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2486 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2487 DECL_ABSTRACT_ORIGIN (x)
2488 = DECL_ABSTRACT_ORIGIN (oldglobal);
2490 /* Inner extern decl is built-in if global one is. */
2491 if (DECL_BUILT_IN (oldglobal))
2493 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2494 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2496 /* Keep the arg types from a file-scope fcn defn. */
2497 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2498 && DECL_INITIAL (oldglobal)
2499 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2500 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2504 #if 0
2505 /* This case is probably sometimes the right thing to do. */
2506 /* If we have a local external declaration,
2507 then any file-scope declaration should not
2508 have been static. */
2509 if (oldlocal == 0 && oldglobal != 0
2510 && !TREE_PUBLIC (oldglobal)
2511 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2512 warning ("`%s' locally external but globally static",
2513 IDENTIFIER_POINTER (name));
2514 #endif
2516 /* If we have a local external declaration,
2517 and no file-scope declaration has yet been seen,
2518 then if we later have a file-scope decl it must not be static. */
2519 if (oldlocal == 0
2520 && DECL_EXTERNAL (x)
2521 && TREE_PUBLIC (x))
2523 if (oldglobal == 0)
2524 TREE_PUBLIC (name) = 1;
2526 /* Save this decl, so that we can do type checking against
2527 other decls after it falls out of scope.
2529 Only save it once. This prevents temporary decls created in
2530 expand_inline_function from being used here, since this
2531 will have been set when the inline function was parsed.
2532 It also helps give slightly better warnings. */
2533 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2534 IDENTIFIER_LIMBO_VALUE (name) = x;
2537 warn_if_shadowing (x, oldlocal);
2539 /* If storing a local value, there may already be one (inherited).
2540 If so, record it for restoration when this binding level ends. */
2541 if (oldlocal != 0)
2542 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2545 /* Keep count of variables in this level with incomplete type.
2546 If the input is erroneous, we can have error_mark in the type
2547 slot (e.g. "f(void a, ...)") - that doesn't count as an
2548 incomplete type. */
2549 if (TREE_TYPE (x) != error_mark_node
2550 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2552 tree element = TREE_TYPE (x);
2554 while (TREE_CODE (element) == ARRAY_TYPE)
2555 element = TREE_TYPE (element);
2556 if (TREE_CODE (element) == RECORD_TYPE
2557 || TREE_CODE (element) == UNION_TYPE)
2558 ++b->n_incomplete;
2562 /* Put decls on list in reverse order.
2563 We will reverse them later if necessary. */
2564 TREE_CHAIN (x) = b->names;
2565 b->names = x;
2567 return x;
2570 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2572 tree
2573 pushdecl_top_level (x)
2574 tree x;
2576 tree t;
2577 struct binding_level *b = current_binding_level;
2579 current_binding_level = global_binding_level;
2580 t = pushdecl (x);
2581 current_binding_level = b;
2582 return t;
2585 /* Generate an implicit declaration for identifier FUNCTIONID
2586 as a function of type int (). Print a warning if appropriate. */
2588 tree
2589 implicitly_declare (functionid)
2590 tree functionid;
2592 tree decl;
2593 int traditional_warning = 0;
2594 /* Only one "implicit declaration" warning per identifier. */
2595 int implicit_warning;
2597 /* We used to reuse an old implicit decl here,
2598 but this loses with inline functions because it can clobber
2599 the saved decl chains. */
2600 #if 0
2601 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2602 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2603 else
2604 #endif
2605 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2607 /* Warn of implicit decl following explicit local extern decl.
2608 This is probably a program designed for traditional C. */
2609 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2610 traditional_warning = 1;
2612 /* Warn once of an implicit declaration. */
2613 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2615 DECL_EXTERNAL (decl) = 1;
2616 TREE_PUBLIC (decl) = 1;
2618 /* Record that we have an implicit decl and this is it. */
2619 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2621 /* ANSI standard says implicit declarations are in the innermost block.
2622 So we record the decl in the standard fashion.
2623 If flag_traditional is set, pushdecl does it top-level. */
2624 pushdecl (decl);
2626 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2627 maybe_objc_check_decl (decl);
2629 rest_of_decl_compilation (decl, NULL, 0, 0);
2631 if (implicit_warning)
2632 implicit_decl_warning (functionid);
2633 else if (warn_traditional && traditional_warning)
2634 warning ("function `%s' was previously declared within a block",
2635 IDENTIFIER_POINTER (functionid));
2637 /* Write a record describing this implicit function declaration to the
2638 prototypes file (if requested). */
2640 gen_aux_info_record (decl, 0, 1, 0);
2642 /* Possibly apply some default attributes to this implicit declaration. */
2643 decl_attributes (&decl, NULL_TREE, 0);
2645 return decl;
2648 void
2649 implicit_decl_warning (id)
2650 tree id;
2652 const char *name = IDENTIFIER_POINTER (id);
2653 if (mesg_implicit_function_declaration == 2)
2654 error ("implicit declaration of function `%s'", name);
2655 else if (mesg_implicit_function_declaration == 1)
2656 warning ("implicit declaration of function `%s'", name);
2659 /* Return zero if the declaration NEWDECL is valid
2660 when the declaration OLDDECL (assumed to be for the same name)
2661 has already been seen.
2662 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2663 and 3 if it is a conflicting declaration. */
2665 static int
2666 redeclaration_error_message (newdecl, olddecl)
2667 tree newdecl, olddecl;
2669 if (TREE_CODE (newdecl) == TYPE_DECL)
2671 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2672 return 0;
2673 /* pushdecl creates distinct types for TYPE_DECLs by calling
2674 build_type_copy, so the above comparison generally fails. We do
2675 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2676 is equivalent to what this code used to do before the build_type_copy
2677 call. The variant type distinction should not matter for traditional
2678 code, because it doesn't have type qualifiers. */
2679 if (flag_traditional
2680 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2681 return 0;
2682 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2683 return 0;
2684 return 1;
2686 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2688 /* Declarations of functions can insist on internal linkage
2689 but they can't be inconsistent with internal linkage,
2690 so there can be no error on that account.
2691 However defining the same name twice is no good. */
2692 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2693 /* However, defining once as extern inline and a second
2694 time in another way is ok. */
2695 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2696 && ! (DECL_DECLARED_INLINE_P (newdecl)
2697 && DECL_EXTERNAL (newdecl))))
2698 return 1;
2699 return 0;
2701 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2703 /* Objects declared at top level: */
2704 /* If at least one is a reference, it's ok. */
2705 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2706 return 0;
2707 /* Reject two definitions. */
2708 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2709 return 1;
2710 /* Now we have two tentative defs, or one tentative and one real def. */
2711 /* Insist that the linkage match. */
2712 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2713 return 3;
2714 return 0;
2716 else if (current_binding_level->parm_flag
2717 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2718 return 0;
2719 else
2721 /* Newdecl has block scope. If olddecl has block scope also, then
2722 reject two definitions, and reject a definition together with an
2723 external reference. Otherwise, it is OK, because newdecl must
2724 be an extern reference to olddecl. */
2725 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2726 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2727 return 2;
2728 return 0;
2732 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2733 Create one if none exists so far for the current function.
2734 This function is called for both label definitions and label references. */
2736 tree
2737 lookup_label (id)
2738 tree id;
2740 tree decl = IDENTIFIER_LABEL_VALUE (id);
2742 if (current_function_decl == 0)
2744 error ("label %s referenced outside of any function",
2745 IDENTIFIER_POINTER (id));
2746 return 0;
2749 /* Use a label already defined or ref'd with this name. */
2750 if (decl != 0)
2752 /* But not if it is inherited and wasn't declared to be inheritable. */
2753 if (DECL_CONTEXT (decl) != current_function_decl
2754 && ! C_DECLARED_LABEL_FLAG (decl))
2755 return shadow_label (id);
2756 return decl;
2759 decl = build_decl (LABEL_DECL, id, void_type_node);
2761 /* A label not explicitly declared must be local to where it's ref'd. */
2762 DECL_CONTEXT (decl) = current_function_decl;
2764 DECL_MODE (decl) = VOIDmode;
2766 /* Say where one reference is to the label,
2767 for the sake of the error if it is not defined. */
2768 DECL_SOURCE_LINE (decl) = lineno;
2769 DECL_SOURCE_FILE (decl) = input_filename;
2771 IDENTIFIER_LABEL_VALUE (id) = decl;
2773 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2775 return decl;
2778 /* Make a label named NAME in the current function,
2779 shadowing silently any that may be inherited from containing functions
2780 or containing scopes.
2782 Note that valid use, if the label being shadowed
2783 comes from another scope in the same function,
2784 requires calling declare_nonlocal_label right away. */
2786 tree
2787 shadow_label (name)
2788 tree name;
2790 tree decl = IDENTIFIER_LABEL_VALUE (name);
2792 if (decl != 0)
2794 tree dup;
2796 /* Check to make sure that the label hasn't already been declared
2797 at this label scope */
2798 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2799 if (TREE_VALUE (dup) == decl)
2801 error ("duplicate label declaration `%s'",
2802 IDENTIFIER_POINTER (name));
2803 error_with_decl (TREE_VALUE (dup),
2804 "this is a previous declaration");
2805 /* Just use the previous declaration. */
2806 return lookup_label (name);
2809 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2810 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2813 return lookup_label (name);
2816 /* Define a label, specifying the location in the source file.
2817 Return the LABEL_DECL node for the label, if the definition is valid.
2818 Otherwise return 0. */
2820 tree
2821 define_label (filename, line, name)
2822 const char *filename;
2823 int line;
2824 tree name;
2826 tree decl = lookup_label (name);
2828 /* If label with this name is known from an outer context, shadow it. */
2829 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2831 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2832 IDENTIFIER_LABEL_VALUE (name) = 0;
2833 decl = lookup_label (name);
2836 if (warn_traditional && !in_system_header && lookup_name (name))
2837 warning_with_file_and_line (filename, line,
2838 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2839 IDENTIFIER_POINTER (name));
2841 if (DECL_INITIAL (decl) != 0)
2843 error_with_file_and_line (filename, line, "duplicate label `%s'",
2844 IDENTIFIER_POINTER (name));
2845 return 0;
2847 else
2849 /* Mark label as having been defined. */
2850 DECL_INITIAL (decl) = error_mark_node;
2851 /* Say where in the source. */
2852 DECL_SOURCE_FILE (decl) = filename;
2853 DECL_SOURCE_LINE (decl) = line;
2854 return decl;
2858 /* Return the list of declarations of the current level.
2859 Note that this list is in reverse order unless/until
2860 you nreverse it; and when you do nreverse it, you must
2861 store the result back using `storedecls' or you will lose. */
2863 tree
2864 getdecls ()
2866 return current_binding_level->names;
2869 /* Return the list of type-tags (for structs, etc) of the current level. */
2871 tree
2872 gettags ()
2874 return current_binding_level->tags;
2877 /* Store the list of declarations of the current level.
2878 This is done for the parameter declarations of a function being defined,
2879 after they are modified in the light of any missing parameters. */
2881 static void
2882 storedecls (decls)
2883 tree decls;
2885 current_binding_level->names = decls;
2888 /* Similarly, store the list of tags of the current level. */
2890 static void
2891 storetags (tags)
2892 tree tags;
2894 current_binding_level->tags = tags;
2897 /* Given NAME, an IDENTIFIER_NODE,
2898 return the structure (or union or enum) definition for that name.
2899 Searches binding levels from BINDING_LEVEL up to the global level.
2900 If THISLEVEL_ONLY is nonzero, searches only the specified context
2901 (but skips any tag-transparent contexts to find one that is
2902 meaningful for tags).
2903 CODE says which kind of type the caller wants;
2904 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2905 If the wrong kind of type is found, an error is reported. */
2907 static tree
2908 lookup_tag (code, name, binding_level, thislevel_only)
2909 enum tree_code code;
2910 struct binding_level *binding_level;
2911 tree name;
2912 int thislevel_only;
2914 struct binding_level *level;
2915 int thislevel = 1;
2917 for (level = binding_level; level; level = level->level_chain)
2919 tree tail;
2920 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2922 if (TREE_PURPOSE (tail) == name)
2924 if (TREE_CODE (TREE_VALUE (tail)) != code)
2926 /* Definition isn't the kind we were looking for. */
2927 pending_invalid_xref = name;
2928 pending_invalid_xref_file = input_filename;
2929 pending_invalid_xref_line = lineno;
2930 /* If in the same binding level as a declaration as a tag
2931 of a different type, this must not be allowed to
2932 shadow that tag, so give the error immediately.
2933 (For example, "struct foo; union foo;" is invalid.) */
2934 if (thislevel)
2935 pending_xref_error ();
2937 return TREE_VALUE (tail);
2940 if (! level->tag_transparent)
2942 if (thislevel_only)
2943 return NULL_TREE;
2944 thislevel = 0;
2947 return NULL_TREE;
2950 /* Print an error message now
2951 for a recent invalid struct, union or enum cross reference.
2952 We don't print them immediately because they are not invalid
2953 when used in the `struct foo;' construct for shadowing. */
2955 void
2956 pending_xref_error ()
2958 if (pending_invalid_xref != 0)
2959 error_with_file_and_line (pending_invalid_xref_file,
2960 pending_invalid_xref_line,
2961 "`%s' defined as wrong kind of tag",
2962 IDENTIFIER_POINTER (pending_invalid_xref));
2963 pending_invalid_xref = 0;
2966 /* Given a type, find the tag that was defined for it and return the tag name.
2967 Otherwise return 0. */
2969 static tree
2970 lookup_tag_reverse (type)
2971 tree type;
2973 struct binding_level *level;
2975 for (level = current_binding_level; level; level = level->level_chain)
2977 tree tail;
2978 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2980 if (TREE_VALUE (tail) == type)
2981 return TREE_PURPOSE (tail);
2984 return NULL_TREE;
2987 /* Look up NAME in the current binding level and its superiors
2988 in the namespace of variables, functions and typedefs.
2989 Return a ..._DECL node of some kind representing its definition,
2990 or return 0 if it is undefined. */
2992 tree
2993 lookup_name (name)
2994 tree name;
2996 tree val;
2998 if (current_binding_level != global_binding_level
2999 && IDENTIFIER_LOCAL_VALUE (name))
3000 val = IDENTIFIER_LOCAL_VALUE (name);
3001 else
3002 val = IDENTIFIER_GLOBAL_VALUE (name);
3003 return val;
3006 /* Similar to `lookup_name' but look only at current binding level. */
3008 tree
3009 lookup_name_current_level (name)
3010 tree name;
3012 tree t;
3014 if (current_binding_level == global_binding_level)
3015 return IDENTIFIER_GLOBAL_VALUE (name);
3017 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
3018 return 0;
3020 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
3021 if (DECL_NAME (t) == name)
3022 break;
3024 return t;
3027 /* Mark ARG for GC. */
3029 static void
3030 mark_binding_level (arg)
3031 void *arg;
3033 struct binding_level *level = *(struct binding_level **) arg;
3035 for (; level != 0; level = level->level_chain)
3037 ggc_mark_tree (level->names);
3038 ggc_mark_tree (level->tags);
3039 ggc_mark_tree (level->shadowed);
3040 ggc_mark_tree (level->blocks);
3041 ggc_mark_tree (level->this_block);
3042 ggc_mark_tree (level->parm_order);
3046 /* Create the predefined scalar types of C,
3047 and some nodes representing standard constants (0, 1, (void *) 0).
3048 Initialize the global binding level.
3049 Make definitions for built-in primitive functions. */
3051 void
3052 c_init_decl_processing ()
3054 tree endlink;
3055 tree ptr_ftype_void, ptr_ftype_ptr;
3057 /* Adds some ggc roots, and reserved words for c-parse.in. */
3058 c_parse_init ();
3060 current_function_decl = NULL;
3061 named_labels = NULL;
3062 current_binding_level = NULL_BINDING_LEVEL;
3063 free_binding_level = NULL_BINDING_LEVEL;
3065 /* Make the binding_level structure for global names. */
3066 pushlevel (0);
3067 global_binding_level = current_binding_level;
3069 build_common_tree_nodes (flag_signed_char);
3071 c_common_nodes_and_builtins ();
3073 boolean_type_node = integer_type_node;
3074 boolean_true_node = integer_one_node;
3075 boolean_false_node = integer_zero_node;
3077 /* With GCC, C99's _Bool is always of size 1. */
3078 c_bool_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3079 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
3080 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
3081 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
3082 TYPE_PRECISION (c_bool_type_node) = 1;
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
3084 c_bool_type_node));
3085 c_bool_false_node = build_int_2 (0, 0);
3086 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
3087 c_bool_true_node = build_int_2 (1, 0);
3088 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
3090 endlink = void_list_node;
3091 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3092 ptr_ftype_ptr
3093 = build_function_type (ptr_type_node,
3094 tree_cons (NULL_TREE, ptr_type_node, endlink));
3096 /* Types which are common to the fortran compiler and libf2c. When
3097 changing these, you also need to be concerned with f/com.h. */
3099 if (TYPE_PRECISION (float_type_node)
3100 == TYPE_PRECISION (long_integer_type_node))
3102 g77_integer_type_node = long_integer_type_node;
3103 g77_uinteger_type_node = long_unsigned_type_node;
3105 else if (TYPE_PRECISION (float_type_node)
3106 == TYPE_PRECISION (integer_type_node))
3108 g77_integer_type_node = integer_type_node;
3109 g77_uinteger_type_node = unsigned_type_node;
3111 else
3112 g77_integer_type_node = g77_uinteger_type_node = NULL_TREE;
3114 if (g77_integer_type_node != NULL_TREE)
3116 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_integer"),
3117 g77_integer_type_node));
3118 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_uinteger"),
3119 g77_uinteger_type_node));
3122 if (TYPE_PRECISION (float_type_node) * 2
3123 == TYPE_PRECISION (long_integer_type_node))
3125 g77_longint_type_node = long_integer_type_node;
3126 g77_ulongint_type_node = long_unsigned_type_node;
3128 else if (TYPE_PRECISION (float_type_node) * 2
3129 == TYPE_PRECISION (long_long_integer_type_node))
3131 g77_longint_type_node = long_long_integer_type_node;
3132 g77_ulongint_type_node = long_long_unsigned_type_node;
3134 else
3135 g77_longint_type_node = g77_ulongint_type_node = NULL_TREE;
3137 if (g77_longint_type_node != NULL_TREE)
3139 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_longint"),
3140 g77_longint_type_node));
3141 pushdecl (build_decl (TYPE_DECL, get_identifier ("__g77_ulongint"),
3142 g77_ulongint_type_node));
3145 pedantic_lvalues = pedantic;
3147 make_fname_decl = c_make_fname_decl;
3148 start_fname_decls ();
3150 incomplete_decl_finalize_hook = finish_incomplete_decl;
3152 /* Record our roots. */
3154 ggc_add_tree_root (c_global_trees, CTI_MAX);
3155 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
3156 ggc_add_tree_root (&c_scope_stmt_stack, 1);
3157 ggc_add_tree_root (&named_labels, 1);
3158 ggc_add_tree_root (&shadowed_labels, 1);
3159 ggc_add_root (&current_binding_level, 1, sizeof current_binding_level,
3160 mark_binding_level);
3161 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3162 mark_binding_level);
3163 ggc_add_tree_root (&static_ctors, 1);
3164 ggc_add_tree_root (&static_dtors, 1);
3167 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
3168 decl, NAME is the initialization string and TYPE_DEP indicates whether
3169 NAME depended on the type of the function. As we don't yet implement
3170 delayed emission of static data, we mark the decl as emitted
3171 so it is not placed in the output. Anything using it must therefore pull
3172 out the STRING_CST initializer directly. This does mean that these names
3173 are string merging candidates, which is wrong for C99's __func__. FIXME. */
3175 static tree
3176 c_make_fname_decl (id, type_dep)
3177 tree id;
3178 int type_dep;
3180 const char *name = fname_as_string (type_dep);
3181 tree decl, type, init;
3182 size_t length = strlen (name);
3184 type = build_array_type
3185 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
3186 build_index_type (size_int (length)));
3188 decl = build_decl (VAR_DECL, id, type);
3189 /* We don't push the decl, so have to set its context here. */
3190 DECL_CONTEXT (decl) = current_function_decl;
3192 TREE_STATIC (decl) = 1;
3193 TREE_READONLY (decl) = 1;
3194 DECL_ARTIFICIAL (decl) = 1;
3196 init = build_string (length + 1, name);
3197 TREE_TYPE (init) = type;
3198 DECL_INITIAL (decl) = init;
3200 TREE_USED (decl) = 1;
3202 finish_decl (decl, init, NULL_TREE);
3204 return decl;
3207 /* Return a definition for a builtin function named NAME and whose data type
3208 is TYPE. TYPE should be a function type with argument types.
3209 FUNCTION_CODE tells later passes how to compile calls to this function.
3210 See tree.h for its possible values.
3212 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3213 the name to be called if we can't opencode the function. */
3215 tree
3216 builtin_function (name, type, function_code, class, library_name)
3217 const char *name;
3218 tree type;
3219 int function_code;
3220 enum built_in_class class;
3221 const char *library_name;
3223 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3224 DECL_EXTERNAL (decl) = 1;
3225 TREE_PUBLIC (decl) = 1;
3226 /* If -traditional, permit redefining a builtin function any way you like.
3227 (Though really, if the program redefines these functions,
3228 it probably won't work right unless compiled with -fno-builtin.) */
3229 if (flag_traditional && name[0] != '_')
3230 DECL_BUILT_IN_NONANSI (decl) = 1;
3231 if (library_name)
3232 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3233 make_decl_rtl (decl, NULL);
3234 pushdecl (decl);
3235 DECL_BUILT_IN_CLASS (decl) = class;
3236 DECL_FUNCTION_CODE (decl) = function_code;
3238 /* The return builtins leave the current function. */
3239 if (function_code == BUILT_IN_RETURN || function_code == BUILT_IN_EH_RETURN)
3240 TREE_THIS_VOLATILE (decl) = 1;
3242 /* Warn if a function in the namespace for users
3243 is used without an occasion to consider it declared. */
3244 if (name[0] != '_' || name[1] != '_')
3245 C_DECL_ANTICIPATED (decl) = 1;
3247 /* Possibly apply some default attributes to this built-in function. */
3248 decl_attributes (&decl, NULL_TREE, 0);
3250 return decl;
3253 /* Apply default attributes to a function, if a system function with default
3254 attributes. */
3256 void
3257 insert_default_attributes (decl)
3258 tree decl;
3260 if (!TREE_PUBLIC (decl))
3261 return;
3262 c_common_insert_default_attributes (decl);
3265 /* Called when a declaration is seen that contains no names to declare.
3266 If its type is a reference to a structure, union or enum inherited
3267 from a containing scope, shadow that tag name for the current scope
3268 with a forward reference.
3269 If its type defines a new named structure or union
3270 or defines an enum, it is valid but we need not do anything here.
3271 Otherwise, it is an error. */
3273 void
3274 shadow_tag (declspecs)
3275 tree declspecs;
3277 shadow_tag_warned (declspecs, 0);
3280 void
3281 shadow_tag_warned (declspecs, warned)
3282 tree declspecs;
3283 int warned;
3284 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3285 no pedwarn. */
3287 int found_tag = 0;
3288 tree link;
3289 tree specs, attrs;
3291 pending_invalid_xref = 0;
3293 /* Remove the attributes from declspecs, since they will confuse the
3294 following code. */
3295 split_specs_attrs (declspecs, &specs, &attrs);
3297 for (link = specs; link; link = TREE_CHAIN (link))
3299 tree value = TREE_VALUE (link);
3300 enum tree_code code = TREE_CODE (value);
3302 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3303 /* Used to test also that TYPE_SIZE (value) != 0.
3304 That caused warning for `struct foo;' at top level in the file. */
3306 tree name = lookup_tag_reverse (value);
3307 tree t;
3309 found_tag++;
3311 if (name == 0)
3313 if (warned != 1 && code != ENUMERAL_TYPE)
3314 /* Empty unnamed enum OK */
3316 pedwarn ("unnamed struct/union that defines no instances");
3317 warned = 1;
3320 else
3322 t = lookup_tag (code, name, current_binding_level, 1);
3324 if (t == 0)
3326 t = make_node (code);
3327 pushtag (name, t);
3331 else
3333 if (!warned && ! in_system_header)
3335 warning ("useless keyword or type name in empty declaration");
3336 warned = 2;
3341 if (found_tag > 1)
3342 error ("two types specified in one empty declaration");
3344 if (warned != 1)
3346 if (found_tag == 0)
3347 pedwarn ("empty declaration");
3351 /* Construct an array declarator. EXPR is the expression inside [], or
3352 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3353 to the pointer to which a parameter array is converted). STATIC_P is
3354 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3355 is non-zero is the array is [*], a VLA of unspecified length which is
3356 nevertheless a complete type (not currently implemented by GCC),
3357 zero otherwise. The declarator is constructed as an ARRAY_REF
3358 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3359 left of the [] (filled by in set_array_declarator_type) and operand 1
3360 is the expression inside; whose TREE_TYPE is the type qualifiers and
3361 which has TREE_STATIC set if "static" is used. */
3363 tree
3364 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3365 tree expr;
3366 tree quals;
3367 int static_p;
3368 int vla_unspec_p;
3370 tree decl;
3371 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3372 TREE_TYPE (decl) = quals;
3373 TREE_STATIC (decl) = (static_p ? 1 : 0);
3374 if (pedantic && !flag_isoc99)
3376 if (static_p || quals != NULL_TREE)
3377 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3378 if (vla_unspec_p)
3379 pedwarn ("ISO C89 does not support `[*]' array declarators");
3381 if (vla_unspec_p)
3382 warning ("GCC does not yet properly implement `[*]' array declarators");
3383 return decl;
3386 /* Set the type of an array declarator. DECL is the declarator, as
3387 constructed by build_array_declarator; TYPE is what appears on the left
3388 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3389 abstract declarator, zero otherwise; this is used to reject static and
3390 type qualifiers in abstract declarators, where they are not in the
3391 C99 grammar. */
3393 tree
3394 set_array_declarator_type (decl, type, abstract_p)
3395 tree decl;
3396 tree type;
3397 int abstract_p;
3399 TREE_OPERAND (decl, 0) = type;
3400 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3401 error ("static or type qualifiers in abstract declarator");
3402 return decl;
3405 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3407 tree
3408 groktypename (typename)
3409 tree typename;
3411 tree specs, attrs;
3413 if (TREE_CODE (typename) != TREE_LIST)
3414 return typename;
3416 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3418 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
3420 /* Apply attributes. */
3421 decl_attributes (&typename, attrs, 0);
3423 return typename;
3426 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3428 tree
3429 groktypename_in_parm_context (typename)
3430 tree typename;
3432 if (TREE_CODE (typename) != TREE_LIST)
3433 return typename;
3434 return grokdeclarator (TREE_VALUE (typename),
3435 TREE_PURPOSE (typename),
3436 PARM, 0);
3439 /* Decode a declarator in an ordinary declaration or data definition.
3440 This is called as soon as the type information and variable name
3441 have been parsed, before parsing the initializer if any.
3442 Here we create the ..._DECL node, fill in its type,
3443 and put it on the list of decls for the current context.
3444 The ..._DECL node is returned as the value.
3446 Exception: for arrays where the length is not specified,
3447 the type is left null, to be filled in by `finish_decl'.
3449 Function definitions do not come here; they go to start_function
3450 instead. However, external and forward declarations of functions
3451 do go through here. Structure field declarations are done by
3452 grokfield and not through here. */
3454 tree
3455 start_decl (declarator, declspecs, initialized, attributes)
3456 tree declarator, declspecs;
3457 int initialized;
3458 tree attributes;
3460 tree decl;
3461 tree tem;
3463 /* An object declared as __attribute__((deprecated)) suppresses
3464 warnings of uses of other deprecated items. */
3465 if (lookup_attribute ("deprecated", attributes))
3466 deprecated_state = DEPRECATED_SUPPRESS;
3468 decl = grokdeclarator (declarator, declspecs,
3469 NORMAL, initialized);
3471 deprecated_state = DEPRECATED_NORMAL;
3473 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3474 && MAIN_NAME_P (DECL_NAME (decl)))
3475 warning_with_decl (decl, "`%s' is usually a function");
3477 if (initialized)
3478 /* Is it valid for this decl to have an initializer at all?
3479 If not, set INITIALIZED to zero, which will indirectly
3480 tell `finish_decl' to ignore the initializer once it is parsed. */
3481 switch (TREE_CODE (decl))
3483 case TYPE_DECL:
3484 /* typedef foo = bar means give foo the same type as bar.
3485 We haven't parsed bar yet, so `finish_decl' will fix that up.
3486 Any other case of an initialization in a TYPE_DECL is an error. */
3487 if (pedantic || list_length (declspecs) > 1)
3489 error ("typedef `%s' is initialized",
3490 IDENTIFIER_POINTER (DECL_NAME (decl)));
3491 initialized = 0;
3493 break;
3495 case FUNCTION_DECL:
3496 error ("function `%s' is initialized like a variable",
3497 IDENTIFIER_POINTER (DECL_NAME (decl)));
3498 initialized = 0;
3499 break;
3501 case PARM_DECL:
3502 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3503 error ("parameter `%s' is initialized",
3504 IDENTIFIER_POINTER (DECL_NAME (decl)));
3505 initialized = 0;
3506 break;
3508 default:
3509 /* Don't allow initializations for incomplete types
3510 except for arrays which might be completed by the initialization. */
3512 /* This can happen if the array size is an undefined macro. We already
3513 gave a warning, so we don't need another one. */
3514 if (TREE_TYPE (decl) == error_mark_node)
3515 initialized = 0;
3516 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3518 /* A complete type is ok if size is fixed. */
3520 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3521 || C_DECL_VARIABLE_SIZE (decl))
3523 error ("variable-sized object may not be initialized");
3524 initialized = 0;
3527 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3529 error ("variable `%s' has initializer but incomplete type",
3530 IDENTIFIER_POINTER (DECL_NAME (decl)));
3531 initialized = 0;
3533 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3535 error ("elements of array `%s' have incomplete type",
3536 IDENTIFIER_POINTER (DECL_NAME (decl)));
3537 initialized = 0;
3541 if (initialized)
3543 #if 0
3544 /* Seems redundant with grokdeclarator. */
3545 if (current_binding_level != global_binding_level
3546 && DECL_EXTERNAL (decl)
3547 && TREE_CODE (decl) != FUNCTION_DECL)
3548 warning ("declaration of `%s' has `extern' and is initialized",
3549 IDENTIFIER_POINTER (DECL_NAME (decl)));
3550 #endif
3551 DECL_EXTERNAL (decl) = 0;
3552 if (current_binding_level == global_binding_level)
3553 TREE_STATIC (decl) = 1;
3555 /* Tell `pushdecl' this is an initialized decl
3556 even though we don't yet have the initializer expression.
3557 Also tell `finish_decl' it may store the real initializer. */
3558 DECL_INITIAL (decl) = error_mark_node;
3561 /* If this is a function declaration, write a record describing it to the
3562 prototypes file (if requested). */
3564 if (TREE_CODE (decl) == FUNCTION_DECL)
3565 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3567 /* ANSI specifies that a tentative definition which is not merged with
3568 a non-tentative definition behaves exactly like a definition with an
3569 initializer equal to zero. (Section 3.7.2)
3570 -fno-common gives strict ANSI behavior. Usually you don't want it.
3571 This matters only for variables with external linkage. */
3572 if (! flag_no_common || ! TREE_PUBLIC (decl))
3573 DECL_COMMON (decl) = 1;
3575 /* Set attributes here so if duplicate decl, will have proper attributes. */
3576 decl_attributes (&decl, attributes, 0);
3578 if (TREE_CODE (decl) == FUNCTION_DECL
3579 && DECL_DECLARED_INLINE_P (decl)
3580 && DECL_UNINLINABLE (decl)
3581 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3582 warning_with_decl (decl,
3583 "inline function `%s' given attribute noinline");
3585 /* Add this decl to the current binding level.
3586 TEM may equal DECL or it may be a previous decl of the same name. */
3587 tem = pushdecl (decl);
3589 /* For a local variable, define the RTL now. */
3590 if (current_binding_level != global_binding_level
3591 /* But not if this is a duplicate decl
3592 and we preserved the rtl from the previous one
3593 (which may or may not happen). */
3594 && !DECL_RTL_SET_P (tem)
3595 && !DECL_CONTEXT (tem))
3597 if (TREE_TYPE (tem) != error_mark_node
3598 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3599 expand_decl (tem);
3600 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3601 && DECL_INITIAL (tem) != 0)
3602 expand_decl (tem);
3605 return tem;
3608 /* Finish processing of a declaration;
3609 install its initial value.
3610 If the length of an array type is not known before,
3611 it must be determined now, from the initial value, or it is an error. */
3613 void
3614 finish_decl (decl, init, asmspec_tree)
3615 tree decl, init;
3616 tree asmspec_tree;
3618 tree type = TREE_TYPE (decl);
3619 int was_incomplete = (DECL_SIZE (decl) == 0);
3620 const char *asmspec = 0;
3622 /* If a name was specified, get the string. */
3623 if (asmspec_tree)
3624 asmspec = TREE_STRING_POINTER (asmspec_tree);
3626 /* If `start_decl' didn't like having an initialization, ignore it now. */
3627 if (init != 0 && DECL_INITIAL (decl) == 0)
3628 init = 0;
3630 /* Don't crash if parm is initialized. */
3631 if (TREE_CODE (decl) == PARM_DECL)
3632 init = 0;
3634 if (init)
3636 if (TREE_CODE (decl) != TYPE_DECL)
3637 store_init_value (decl, init);
3638 else
3640 /* typedef foo = bar; store the type of bar as the type of foo. */
3641 TREE_TYPE (decl) = TREE_TYPE (init);
3642 DECL_INITIAL (decl) = init = 0;
3646 /* Deduce size of array from initialization, if not already known */
3647 if (TREE_CODE (type) == ARRAY_TYPE
3648 && TYPE_DOMAIN (type) == 0
3649 && TREE_CODE (decl) != TYPE_DECL)
3651 int do_default
3652 = (TREE_STATIC (decl)
3653 /* Even if pedantic, an external linkage array
3654 may have incomplete type at first. */
3655 ? pedantic && !TREE_PUBLIC (decl)
3656 : !DECL_EXTERNAL (decl));
3657 int failure
3658 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3660 /* Get the completed type made by complete_array_type. */
3661 type = TREE_TYPE (decl);
3663 if (failure == 1)
3664 error_with_decl (decl, "initializer fails to determine size of `%s'");
3666 else if (failure == 2)
3668 if (do_default)
3669 error_with_decl (decl, "array size missing in `%s'");
3670 /* If a `static' var's size isn't known,
3671 make it extern as well as static, so it does not get
3672 allocated.
3673 If it is not `static', then do not mark extern;
3674 finish_incomplete_decl will give it a default size
3675 and it will get allocated. */
3676 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3677 DECL_EXTERNAL (decl) = 1;
3680 /* TYPE_MAX_VALUE is always one less than the number of elements
3681 in the array, because we start counting at zero. Therefore,
3682 warn only if the value is less than zero. */
3683 else if (pedantic && TYPE_DOMAIN (type) != 0
3684 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3685 error_with_decl (decl, "zero or negative size array `%s'");
3687 layout_decl (decl, 0);
3690 if (TREE_CODE (decl) == VAR_DECL)
3692 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3693 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3694 layout_decl (decl, 0);
3696 if (DECL_SIZE (decl) == 0
3697 /* Don't give an error if we already gave one earlier. */
3698 && TREE_TYPE (decl) != error_mark_node
3699 && (TREE_STATIC (decl)
3701 /* A static variable with an incomplete type
3702 is an error if it is initialized.
3703 Also if it is not file scope.
3704 Otherwise, let it through, but if it is not `extern'
3705 then it may cause an error message later. */
3706 (DECL_INITIAL (decl) != 0
3707 || DECL_CONTEXT (decl) != 0)
3709 /* An automatic variable with an incomplete type
3710 is an error. */
3711 !DECL_EXTERNAL (decl)))
3713 error_with_decl (decl, "storage size of `%s' isn't known");
3714 TREE_TYPE (decl) = error_mark_node;
3717 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3718 && DECL_SIZE (decl) != 0)
3720 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3721 constant_expression_warning (DECL_SIZE (decl));
3722 else
3723 error_with_decl (decl, "storage size of `%s' isn't constant");
3726 if (TREE_USED (type))
3727 TREE_USED (decl) = 1;
3730 /* If this is a function and an assembler name is specified, it isn't
3731 builtin any more. Also reset DECL_RTL so we can give it its new
3732 name. */
3733 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3735 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3736 SET_DECL_RTL (decl, NULL_RTX);
3737 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3740 /* Output the assembler code and/or RTL code for variables and functions,
3741 unless the type is an undefined structure or union.
3742 If not, it will get done when the type is completed. */
3744 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3746 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3747 maybe_objc_check_decl (decl);
3749 if (!DECL_CONTEXT (decl))
3751 if (DECL_INITIAL (decl) == NULL_TREE
3752 || DECL_INITIAL (decl) == error_mark_node)
3753 /* Don't output anything
3754 when a tentative file-scope definition is seen.
3755 But at end of compilation, do output code for them. */
3756 DECL_DEFER_OUTPUT (decl) = 1;
3757 rest_of_decl_compilation (decl, asmspec,
3758 (DECL_CONTEXT (decl) == 0
3759 || TREE_ASM_WRITTEN (decl)), 0);
3761 else
3763 /* This is a local variable. If there is an ASMSPEC, the
3764 user has requested that we handle it specially. */
3765 if (asmspec)
3767 /* In conjunction with an ASMSPEC, the `register'
3768 keyword indicates that we should place the variable
3769 in a particular register. */
3770 if (DECL_REGISTER (decl))
3771 DECL_C_HARD_REGISTER (decl) = 1;
3773 /* If this is not a static variable, issue a warning.
3774 It doesn't make any sense to give an ASMSPEC for an
3775 ordinary, non-register local variable. Historically,
3776 GCC has accepted -- but ignored -- the ASMSPEC in
3777 this case. */
3778 if (TREE_CODE (decl) == VAR_DECL
3779 && !DECL_REGISTER (decl)
3780 && !TREE_STATIC (decl))
3781 warning_with_decl (decl,
3782 "ignoring asm-specifier for non-static local variable `%s'");
3783 else
3784 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3787 if (TREE_CODE (decl) != FUNCTION_DECL)
3788 add_decl_stmt (decl);
3791 if (DECL_CONTEXT (decl) != 0)
3793 /* Recompute the RTL of a local array now
3794 if it used to be an incomplete type. */
3795 if (was_incomplete
3796 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3798 /* If we used it already as memory, it must stay in memory. */
3799 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3800 /* If it's still incomplete now, no init will save it. */
3801 if (DECL_SIZE (decl) == 0)
3802 DECL_INITIAL (decl) = 0;
3807 if (TREE_CODE (decl) == TYPE_DECL)
3809 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3810 maybe_objc_check_decl (decl);
3811 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3814 /* At the end of a declaration, throw away any variable type sizes
3815 of types defined inside that declaration. There is no use
3816 computing them in the following function definition. */
3817 if (current_binding_level == global_binding_level)
3818 get_pending_sizes ();
3821 /* If DECL has a cleanup, build and return that cleanup here.
3822 This is a callback called by expand_expr. */
3824 tree
3825 maybe_build_cleanup (decl)
3826 tree decl ATTRIBUTE_UNUSED;
3828 /* There are no cleanups in C. */
3829 return NULL_TREE;
3832 /* Given a parsed parameter declaration,
3833 decode it into a PARM_DECL and push that on the current binding level.
3834 Also, for the sake of forward parm decls,
3835 record the given order of parms in `parm_order'. */
3837 void
3838 push_parm_decl (parm)
3839 tree parm;
3841 tree decl;
3842 int old_immediate_size_expand = immediate_size_expand;
3843 /* Don't try computing parm sizes now -- wait till fn is called. */
3844 immediate_size_expand = 0;
3846 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3847 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3848 decl_attributes (&decl, TREE_VALUE (parm), 0);
3850 #if 0
3851 if (DECL_NAME (decl))
3853 tree olddecl;
3854 olddecl = lookup_name (DECL_NAME (decl));
3855 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3856 pedwarn_with_decl (decl,
3857 "ISO C forbids parameter `%s' shadowing typedef");
3859 #endif
3861 decl = pushdecl (decl);
3863 immediate_size_expand = old_immediate_size_expand;
3865 current_binding_level->parm_order
3866 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3868 /* Add this decl to the current binding level. */
3869 finish_decl (decl, NULL_TREE, NULL_TREE);
3872 /* Clear the given order of parms in `parm_order'.
3873 Used at start of parm list,
3874 and also at semicolon terminating forward decls. */
3876 void
3877 clear_parm_order ()
3879 current_binding_level->parm_order = NULL_TREE;
3882 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3883 literal, which may be an incomplete array type completed by the
3884 initializer; INIT is a CONSTRUCTOR that initializes the compound
3885 literal. */
3887 tree
3888 build_compound_literal (type, init)
3889 tree type;
3890 tree init;
3892 /* We do not use start_decl here because we have a type, not a declarator;
3893 and do not use finish_decl because the decl should be stored inside
3894 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3895 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3896 tree complit;
3897 tree stmt;
3898 DECL_EXTERNAL (decl) = 0;
3899 TREE_PUBLIC (decl) = 0;
3900 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3901 DECL_CONTEXT (decl) = current_function_decl;
3902 TREE_USED (decl) = 1;
3903 TREE_TYPE (decl) = type;
3904 store_init_value (decl, init);
3906 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3908 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3909 if (failure)
3910 abort ();
3913 type = TREE_TYPE (decl);
3914 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3915 return error_mark_node;
3917 stmt = build_stmt (DECL_STMT, decl);
3918 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3919 TREE_SIDE_EFFECTS (complit) = 1;
3921 layout_decl (decl, 0);
3923 if (TREE_STATIC (decl))
3925 /* This decl needs a name for the assembler output. We also need
3926 a unique suffix to be added to the name, for which DECL_CONTEXT
3927 must be set. */
3928 DECL_NAME (decl) = get_identifier ("__compound_literal");
3929 DECL_CONTEXT (decl) = complit;
3930 rest_of_decl_compilation (decl, NULL, 1, 0);
3931 DECL_CONTEXT (decl) = NULL_TREE;
3934 return complit;
3937 /* Make TYPE a complete type based on INITIAL_VALUE.
3938 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3939 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3942 complete_array_type (type, initial_value, do_default)
3943 tree type;
3944 tree initial_value;
3945 int do_default;
3947 tree maxindex = NULL_TREE;
3948 int value = 0;
3950 if (initial_value)
3952 /* Note MAXINDEX is really the maximum index,
3953 one less than the size. */
3954 if (TREE_CODE (initial_value) == STRING_CST)
3956 int eltsize
3957 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3958 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3959 / eltsize) - 1, 0);
3961 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3963 tree elts = CONSTRUCTOR_ELTS (initial_value);
3964 maxindex = build_int_2 (-1, -1);
3965 for (; elts; elts = TREE_CHAIN (elts))
3967 if (TREE_PURPOSE (elts))
3968 maxindex = TREE_PURPOSE (elts);
3969 else
3970 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3971 maxindex, integer_one_node));
3973 maxindex = copy_node (maxindex);
3975 else
3977 /* Make an error message unless that happened already. */
3978 if (initial_value != error_mark_node)
3979 value = 1;
3981 /* Prevent further error messages. */
3982 maxindex = build_int_2 (0, 0);
3986 if (!maxindex)
3988 if (do_default)
3989 maxindex = build_int_2 (0, 0);
3990 value = 2;
3993 if (maxindex)
3995 TYPE_DOMAIN (type) = build_index_type (maxindex);
3996 if (!TREE_TYPE (maxindex))
3997 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4000 /* Lay out the type now that we can get the real answer. */
4002 layout_type (type);
4004 return value;
4007 /* Given declspecs and a declarator,
4008 determine the name and type of the object declared
4009 and construct a ..._DECL node for it.
4010 (In one case we can return a ..._TYPE node instead.
4011 For invalid input we sometimes return 0.)
4013 DECLSPECS is a chain of tree_list nodes whose value fields
4014 are the storage classes and type specifiers.
4016 DECL_CONTEXT says which syntactic context this declaration is in:
4017 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4018 FUNCDEF for a function definition. Like NORMAL but a few different
4019 error messages in each case. Return value may be zero meaning
4020 this definition is too screwy to try to parse.
4021 PARM for a parameter declaration (either within a function prototype
4022 or before a function body). Make a PARM_DECL, or return void_type_node.
4023 TYPENAME if for a typename (in a cast or sizeof).
4024 Don't make a DECL node; just return the ..._TYPE node.
4025 FIELD for a struct or union field; make a FIELD_DECL.
4026 BITFIELD for a field with specified width.
4027 INITIALIZED is 1 if the decl has an initializer.
4029 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4030 It may also be so in the PARM case, for a prototype where the
4031 argument type is specified but not the name.
4033 This function is where the complicated C meanings of `static'
4034 and `extern' are interpreted. */
4036 static tree
4037 grokdeclarator (declarator, declspecs, decl_context, initialized)
4038 tree declspecs;
4039 tree declarator;
4040 enum decl_context decl_context;
4041 int initialized;
4043 int specbits = 0;
4044 tree spec;
4045 tree type = NULL_TREE;
4046 int longlong = 0;
4047 int constp;
4048 int restrictp;
4049 int volatilep;
4050 int type_quals = TYPE_UNQUALIFIED;
4051 int inlinep;
4052 int explicit_int = 0;
4053 int explicit_char = 0;
4054 int defaulted_int = 0;
4055 tree typedef_decl = 0;
4056 const char *name;
4057 tree typedef_type = 0;
4058 int funcdef_flag = 0;
4059 enum tree_code innermost_code = ERROR_MARK;
4060 int bitfield = 0;
4061 int size_varies = 0;
4062 tree decl_attr = NULL_TREE;
4063 tree array_ptr_quals = NULL_TREE;
4064 int array_parm_static = 0;
4065 tree returned_attrs = NULL_TREE;
4067 if (decl_context == BITFIELD)
4068 bitfield = 1, decl_context = FIELD;
4070 if (decl_context == FUNCDEF)
4071 funcdef_flag = 1, decl_context = NORMAL;
4073 /* Look inside a declarator for the name being declared
4074 and get it as a string, for an error message. */
4076 tree decl = declarator;
4077 name = 0;
4079 while (decl)
4080 switch (TREE_CODE (decl))
4082 case ARRAY_REF:
4083 case INDIRECT_REF:
4084 case CALL_EXPR:
4085 innermost_code = TREE_CODE (decl);
4086 decl = TREE_OPERAND (decl, 0);
4087 break;
4089 case TREE_LIST:
4090 decl = TREE_VALUE (decl);
4091 break;
4093 case IDENTIFIER_NODE:
4094 name = IDENTIFIER_POINTER (decl);
4095 decl = 0;
4096 break;
4098 default:
4099 abort ();
4101 if (name == 0)
4102 name = "type name";
4105 /* A function definition's declarator must have the form of
4106 a function declarator. */
4108 if (funcdef_flag && innermost_code != CALL_EXPR)
4109 return 0;
4111 /* Anything declared one level down from the top level
4112 must be one of the parameters of a function
4113 (because the body is at least two levels down). */
4115 /* If this looks like a function definition, make it one,
4116 even if it occurs where parms are expected.
4117 Then store_parm_decls will reject it and not use it as a parm. */
4118 if (decl_context == NORMAL && !funcdef_flag
4119 && current_binding_level->parm_flag)
4120 decl_context = PARM;
4122 /* Look through the decl specs and record which ones appear.
4123 Some typespecs are defined as built-in typenames.
4124 Others, the ones that are modifiers of other types,
4125 are represented by bits in SPECBITS: set the bits for
4126 the modifiers that appear. Storage class keywords are also in SPECBITS.
4128 If there is a typedef name or a type, store the type in TYPE.
4129 This includes builtin typedefs such as `int'.
4131 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4132 and did not come from a user typedef.
4134 Set LONGLONG if `long' is mentioned twice. */
4136 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4138 tree id = TREE_VALUE (spec);
4140 /* If the entire declaration is itself tagged as deprecated then
4141 suppress reports of deprecated items. */
4142 if (id && TREE_DEPRECATED (id))
4144 if (deprecated_state != DEPRECATED_SUPPRESS)
4145 warn_deprecated_use (id);
4148 if (id == ridpointers[(int) RID_INT])
4149 explicit_int = 1;
4150 if (id == ridpointers[(int) RID_CHAR])
4151 explicit_char = 1;
4153 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
4155 enum rid i = C_RID_CODE (id);
4156 if ((int) i <= (int) RID_LAST_MODIFIER)
4158 if (i == RID_LONG && (specbits & (1 << (int) i)))
4160 if (longlong)
4161 error ("`long long long' is too long for GCC");
4162 else
4164 if (pedantic && !flag_isoc99 && ! in_system_header
4165 && warn_long_long)
4166 pedwarn ("ISO C89 does not support `long long'");
4167 longlong = 1;
4170 else if (specbits & (1 << (int) i))
4171 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4172 specbits |= 1 << (int) i;
4173 goto found;
4176 if (type)
4177 error ("two or more data types in declaration of `%s'", name);
4178 /* Actual typedefs come to us as TYPE_DECL nodes. */
4179 else if (TREE_CODE (id) == TYPE_DECL)
4181 if (TREE_TYPE (id) == error_mark_node)
4182 ; /* Allow the type to default to int to avoid cascading errors. */
4183 else
4185 type = TREE_TYPE (id);
4186 decl_attr = DECL_ATTRIBUTES (id);
4187 typedef_decl = id;
4190 /* Built-in types come as identifiers. */
4191 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4193 tree t = lookup_name (id);
4194 if (TREE_TYPE (t) == error_mark_node)
4196 else if (!t || TREE_CODE (t) != TYPE_DECL)
4197 error ("`%s' fails to be a typedef or built in type",
4198 IDENTIFIER_POINTER (id));
4199 else
4201 type = TREE_TYPE (t);
4202 typedef_decl = t;
4205 else if (TREE_CODE (id) != ERROR_MARK)
4206 type = id;
4208 found:
4212 typedef_type = type;
4213 if (type)
4214 size_varies = C_TYPE_VARIABLE_SIZE (type);
4216 /* No type at all: default to `int', and set DEFAULTED_INT
4217 because it was not a user-defined typedef. */
4219 if (type == 0)
4221 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4222 | (1 << (int) RID_SIGNED)
4223 | (1 << (int) RID_UNSIGNED)
4224 | (1 << (int) RID_COMPLEX))))
4225 /* Don't warn about typedef foo = bar. */
4226 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4227 && ! in_system_header)
4229 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4230 and this is a function, or if -Wimplicit; prefer the former
4231 warning since it is more explicit. */
4232 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4233 && funcdef_flag)
4234 warn_about_return_type = 1;
4235 else if (warn_implicit_int || flag_isoc99)
4236 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4237 name);
4240 defaulted_int = 1;
4241 type = integer_type_node;
4244 /* Now process the modifiers that were specified
4245 and check for invalid combinations. */
4247 /* Long double is a special combination. */
4249 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4250 && TYPE_MAIN_VARIANT (type) == double_type_node)
4252 specbits &= ~(1 << (int) RID_LONG);
4253 type = long_double_type_node;
4256 /* Check all other uses of type modifiers. */
4258 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4259 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4261 int ok = 0;
4263 if ((specbits & 1 << (int) RID_LONG)
4264 && (specbits & 1 << (int) RID_SHORT))
4265 error ("both long and short specified for `%s'", name);
4266 else if (((specbits & 1 << (int) RID_LONG)
4267 || (specbits & 1 << (int) RID_SHORT))
4268 && explicit_char)
4269 error ("long or short specified with char for `%s'", name);
4270 else if (((specbits & 1 << (int) RID_LONG)
4271 || (specbits & 1 << (int) RID_SHORT))
4272 && TREE_CODE (type) == REAL_TYPE)
4274 static int already = 0;
4276 error ("long or short specified with floating type for `%s'", name);
4277 if (! already && ! pedantic)
4279 error ("the only valid combination is `long double'");
4280 already = 1;
4283 else if ((specbits & 1 << (int) RID_SIGNED)
4284 && (specbits & 1 << (int) RID_UNSIGNED))
4285 error ("both signed and unsigned specified for `%s'", name);
4286 else if (TREE_CODE (type) != INTEGER_TYPE)
4287 error ("long, short, signed or unsigned invalid for `%s'", name);
4288 else
4290 ok = 1;
4291 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4293 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4294 name);
4295 if (flag_pedantic_errors)
4296 ok = 0;
4300 /* Discard the type modifiers if they are invalid. */
4301 if (! ok)
4303 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4304 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4305 longlong = 0;
4309 if ((specbits & (1 << (int) RID_COMPLEX))
4310 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4312 error ("complex invalid for `%s'", name);
4313 specbits &= ~(1 << (int) RID_COMPLEX);
4316 /* Decide whether an integer type is signed or not.
4317 Optionally treat bitfields as signed by default. */
4318 if (specbits & 1 << (int) RID_UNSIGNED
4319 /* Traditionally, all bitfields are unsigned. */
4320 || (bitfield && flag_traditional
4321 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4322 || (bitfield && ! flag_signed_bitfields
4323 && (explicit_int || defaulted_int || explicit_char
4324 /* A typedef for plain `int' without `signed'
4325 can be controlled just like plain `int'. */
4326 || ! (typedef_decl != 0
4327 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4328 && TREE_CODE (type) != ENUMERAL_TYPE
4329 && !(specbits & 1 << (int) RID_SIGNED)))
4331 if (longlong)
4332 type = long_long_unsigned_type_node;
4333 else if (specbits & 1 << (int) RID_LONG)
4334 type = long_unsigned_type_node;
4335 else if (specbits & 1 << (int) RID_SHORT)
4336 type = short_unsigned_type_node;
4337 else if (type == char_type_node)
4338 type = unsigned_char_type_node;
4339 else if (typedef_decl)
4340 type = unsigned_type (type);
4341 else
4342 type = unsigned_type_node;
4344 else if ((specbits & 1 << (int) RID_SIGNED)
4345 && type == char_type_node)
4346 type = signed_char_type_node;
4347 else if (longlong)
4348 type = long_long_integer_type_node;
4349 else if (specbits & 1 << (int) RID_LONG)
4350 type = long_integer_type_node;
4351 else if (specbits & 1 << (int) RID_SHORT)
4352 type = short_integer_type_node;
4354 if (specbits & 1 << (int) RID_COMPLEX)
4356 if (pedantic && !flag_isoc99)
4357 pedwarn ("ISO C89 does not support complex types");
4358 /* If we just have "complex", it is equivalent to
4359 "complex double", but if any modifiers at all are specified it is
4360 the complex form of TYPE. E.g, "complex short" is
4361 "complex short int". */
4363 if (defaulted_int && ! longlong
4364 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4365 | (1 << (int) RID_SIGNED)
4366 | (1 << (int) RID_UNSIGNED))))
4368 if (pedantic)
4369 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4370 type = complex_double_type_node;
4372 else if (type == integer_type_node)
4374 if (pedantic)
4375 pedwarn ("ISO C does not support complex integer types");
4376 type = complex_integer_type_node;
4378 else if (type == float_type_node)
4379 type = complex_float_type_node;
4380 else if (type == double_type_node)
4381 type = complex_double_type_node;
4382 else if (type == long_double_type_node)
4383 type = complex_long_double_type_node;
4384 else
4386 if (pedantic)
4387 pedwarn ("ISO C does not support complex integer types");
4388 type = build_complex_type (type);
4392 /* Figure out the type qualifiers for the declaration. There are
4393 two ways a declaration can become qualified. One is something
4394 like `const int i' where the `const' is explicit. Another is
4395 something like `typedef const int CI; CI i' where the type of the
4396 declaration contains the `const'. */
4397 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4398 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4399 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4400 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4401 if (constp > 1 && ! flag_isoc99)
4402 pedwarn ("duplicate `const'");
4403 if (restrictp > 1 && ! flag_isoc99)
4404 pedwarn ("duplicate `restrict'");
4405 if (volatilep > 1 && ! flag_isoc99)
4406 pedwarn ("duplicate `volatile'");
4407 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4408 type = TYPE_MAIN_VARIANT (type);
4409 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4410 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4411 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4413 /* Warn if two storage classes are given. Default to `auto'. */
4416 int nclasses = 0;
4418 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4419 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4420 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4421 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4422 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4424 /* Warn about storage classes that are invalid for certain
4425 kinds of declarations (parameters, typenames, etc.). */
4427 if (nclasses > 1)
4428 error ("multiple storage classes in declaration of `%s'", name);
4429 else if (funcdef_flag
4430 && (specbits
4431 & ((1 << (int) RID_REGISTER)
4432 | (1 << (int) RID_AUTO)
4433 | (1 << (int) RID_TYPEDEF))))
4435 if (specbits & 1 << (int) RID_AUTO
4436 && (pedantic || current_binding_level == global_binding_level))
4437 pedwarn ("function definition declared `auto'");
4438 if (specbits & 1 << (int) RID_REGISTER)
4439 error ("function definition declared `register'");
4440 if (specbits & 1 << (int) RID_TYPEDEF)
4441 error ("function definition declared `typedef'");
4442 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4443 | (1 << (int) RID_AUTO));
4445 else if (decl_context != NORMAL && nclasses > 0)
4447 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4449 else
4451 switch (decl_context)
4453 case FIELD:
4454 error ("storage class specified for structure field `%s'",
4455 name);
4456 break;
4457 case PARM:
4458 error ("storage class specified for parameter `%s'", name);
4459 break;
4460 default:
4461 error ("storage class specified for typename");
4462 break;
4464 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4465 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4466 | (1 << (int) RID_EXTERN));
4469 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4471 /* `extern' with initialization is invalid if not at top level. */
4472 if (current_binding_level == global_binding_level)
4473 warning ("`%s' initialized and declared `extern'", name);
4474 else
4475 error ("`%s' has both `extern' and initializer", name);
4477 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4478 && current_binding_level != global_binding_level)
4479 error ("nested function `%s' declared `extern'", name);
4480 else if (current_binding_level == global_binding_level
4481 && specbits & (1 << (int) RID_AUTO))
4482 error ("top-level declaration of `%s' specifies `auto'", name);
4485 /* Now figure out the structure of the declarator proper.
4486 Descend through it, creating more complex types, until we reach
4487 the declared identifier (or NULL_TREE, in an absolute declarator). */
4489 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4491 if (type == error_mark_node)
4493 declarator = TREE_OPERAND (declarator, 0);
4494 continue;
4497 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4498 an INDIRECT_REF (for *...),
4499 a CALL_EXPR (for ...(...)),
4500 a TREE_LIST (for nested attributes),
4501 an identifier (for the name being declared)
4502 or a null pointer (for the place in an absolute declarator
4503 where the name was omitted).
4504 For the last two cases, we have just exited the loop.
4506 At this point, TYPE is the type of elements of an array,
4507 or for a function to return, or for a pointer to point to.
4508 After this sequence of ifs, TYPE is the type of the
4509 array or function or pointer, and DECLARATOR has had its
4510 outermost layer removed. */
4512 if (array_ptr_quals != NULL_TREE || array_parm_static)
4514 /* Only the innermost declarator (making a parameter be of
4515 array type which is converted to pointer type)
4516 may have static or type qualifiers. */
4517 error ("static or type qualifiers in non-parameter array declarator");
4518 array_ptr_quals = NULL_TREE;
4519 array_parm_static = 0;
4522 if (TREE_CODE (declarator) == TREE_LIST)
4524 /* We encode a declarator with embedded attributes using
4525 a TREE_LIST. */
4526 tree attrs = TREE_PURPOSE (declarator);
4527 tree inner_decl;
4528 int attr_flags = 0;
4529 declarator = TREE_VALUE (declarator);
4530 inner_decl = declarator;
4531 while (inner_decl != NULL_TREE
4532 && TREE_CODE (inner_decl) == TREE_LIST)
4533 inner_decl = TREE_VALUE (inner_decl);
4534 if (inner_decl == NULL_TREE
4535 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4536 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4537 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4538 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4539 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4540 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4541 returned_attrs = decl_attributes (&type,
4542 chainon (returned_attrs, attrs),
4543 attr_flags);
4545 else if (TREE_CODE (declarator) == ARRAY_REF)
4547 tree itype = NULL_TREE;
4548 tree size = TREE_OPERAND (declarator, 1);
4549 /* The index is a signed object `sizetype' bits wide. */
4550 tree index_type = signed_type (sizetype);
4552 array_ptr_quals = TREE_TYPE (declarator);
4553 array_parm_static = TREE_STATIC (declarator);
4555 declarator = TREE_OPERAND (declarator, 0);
4557 /* Check for some types that there cannot be arrays of. */
4559 if (VOID_TYPE_P (type))
4561 error ("declaration of `%s' as array of voids", name);
4562 type = error_mark_node;
4565 if (TREE_CODE (type) == FUNCTION_TYPE)
4567 error ("declaration of `%s' as array of functions", name);
4568 type = error_mark_node;
4571 if (size == error_mark_node)
4572 type = error_mark_node;
4574 if (type == error_mark_node)
4575 continue;
4577 /* If size was specified, set ITYPE to a range-type for that size.
4578 Otherwise, ITYPE remains null. finish_decl may figure it out
4579 from an initial value. */
4581 if (size)
4583 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4584 STRIP_TYPE_NOPS (size);
4586 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4588 error ("size of array `%s' has non-integer type", name);
4589 size = integer_one_node;
4592 if (pedantic && integer_zerop (size))
4593 pedwarn ("ISO C forbids zero-size array `%s'", name);
4595 if (TREE_CODE (size) == INTEGER_CST)
4597 constant_expression_warning (size);
4598 if (tree_int_cst_sgn (size) < 0)
4600 error ("size of array `%s' is negative", name);
4601 size = integer_one_node;
4604 else
4606 /* Make sure the array size remains visibly nonconstant
4607 even if it is (eg) a const variable with known value. */
4608 size_varies = 1;
4610 if (pedantic)
4612 if (TREE_CONSTANT (size))
4613 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4614 name);
4615 else
4616 pedwarn ("ISO C89 forbids variable-size array `%s'",
4617 name);
4621 if (integer_zerop (size))
4623 /* A zero-length array cannot be represented with an
4624 unsigned index type, which is what we'll get with
4625 build_index_type. Create an open-ended range instead. */
4626 itype = build_range_type (sizetype, size, NULL_TREE);
4628 else
4630 /* Compute the maximum valid index, that is, size - 1.
4631 Do the calculation in index_type, so that if it is
4632 a variable the computations will be done in the
4633 proper mode. */
4634 itype = fold (build (MINUS_EXPR, index_type,
4635 convert (index_type, size),
4636 convert (index_type, size_one_node)));
4638 /* If that overflowed, the array is too big.
4639 ??? While a size of INT_MAX+1 technically shouldn't
4640 cause an overflow (because we subtract 1), the overflow
4641 is recorded during the conversion to index_type, before
4642 the subtraction. Handling this case seems like an
4643 unnecessary complication. */
4644 if (TREE_OVERFLOW (itype))
4646 error ("size of array `%s' is too large", name);
4647 type = error_mark_node;
4648 continue;
4651 if (size_varies)
4652 itype = variable_size (itype);
4653 itype = build_index_type (itype);
4656 else if (decl_context == FIELD)
4658 /* ??? Need to check somewhere that this is a structure
4659 and not a union, that this field is last, and that
4660 this structure has at least one other named member. */
4662 if (pedantic && !flag_isoc99 && !in_system_header)
4663 pedwarn ("ISO C89 does not support flexible array members");
4665 /* ISO C99 Flexible array members are effectively identical
4666 to GCC's zero-length array extension. */
4667 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4670 /* If pedantic, complain about arrays of incomplete types. */
4672 if (pedantic && !COMPLETE_TYPE_P (type))
4673 pedwarn ("array type has incomplete element type");
4675 #if 0
4676 /* We shouldn't have a function type here at all!
4677 Functions aren't allowed as array elements. */
4678 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4679 && (constp || volatilep))
4680 pedwarn ("ISO C forbids const or volatile function types");
4681 #endif
4683 /* Build the array type itself, then merge any constancy or
4684 volatility into the target type. We must do it in this order
4685 to ensure that the TYPE_MAIN_VARIANT field of the array type
4686 is set correctly. */
4688 type = build_array_type (type, itype);
4689 if (type_quals)
4690 type = c_build_qualified_type (type, type_quals);
4692 if (size_varies)
4693 C_TYPE_VARIABLE_SIZE (type) = 1;
4695 /* The GCC extension for zero-length arrays differs from
4696 ISO flexible array members in that sizeof yields zero. */
4697 if (size && integer_zerop (size))
4699 layout_type (type);
4700 TYPE_SIZE (type) = bitsize_zero_node;
4701 TYPE_SIZE_UNIT (type) = size_zero_node;
4703 if (decl_context != PARM
4704 && (array_ptr_quals != NULL_TREE || array_parm_static))
4706 error ("static or type qualifiers in non-parameter array declarator");
4707 array_ptr_quals = NULL_TREE;
4708 array_parm_static = 0;
4711 else if (TREE_CODE (declarator) == CALL_EXPR)
4713 tree arg_types;
4715 /* Declaring a function type.
4716 Make sure we have a valid type for the function to return. */
4717 if (type == error_mark_node)
4718 continue;
4720 size_varies = 0;
4722 /* Warn about some types functions can't return. */
4724 if (TREE_CODE (type) == FUNCTION_TYPE)
4726 error ("`%s' declared as function returning a function", name);
4727 type = integer_type_node;
4729 if (TREE_CODE (type) == ARRAY_TYPE)
4731 error ("`%s' declared as function returning an array", name);
4732 type = integer_type_node;
4735 #ifndef TRADITIONAL_RETURN_FLOAT
4736 /* Traditionally, declaring return type float means double. */
4738 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4739 type = double_type_node;
4740 #endif /* TRADITIONAL_RETURN_FLOAT */
4742 /* Construct the function type and go to the next
4743 inner layer of declarator. */
4745 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4746 funcdef_flag
4747 /* Say it's a definition
4748 only for the CALL_EXPR
4749 closest to the identifier. */
4750 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4751 /* Type qualifiers before the return type of the function
4752 qualify the return type, not the function type. */
4753 if (type_quals)
4755 /* Type qualifiers on a function return type are normally
4756 permitted by the standard but have no effect, so give a
4757 warning at -W. Qualifiers on a void return type have
4758 meaning as a GNU extension, and are banned on function
4759 definitions in ISO C. FIXME: strictly we shouldn't
4760 pedwarn for qualified void return types except on function
4761 definitions, but not doing so could lead to the undesirable
4762 state of a "volatile void" function return type not being
4763 warned about, and a use of the function being compiled
4764 with GNU semantics, with no diagnostics under -pedantic. */
4765 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4766 pedwarn ("ISO C forbids qualified void function return type");
4767 else if (extra_warnings
4768 && !(VOID_TYPE_P (type)
4769 && type_quals == TYPE_QUAL_VOLATILE))
4770 warning ("type qualifiers ignored on function return type");
4772 type = c_build_qualified_type (type, type_quals);
4774 type_quals = TYPE_UNQUALIFIED;
4776 type = build_function_type (type, arg_types);
4777 declarator = TREE_OPERAND (declarator, 0);
4779 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4780 the formal parameter list of this FUNCTION_TYPE to point to
4781 the FUNCTION_TYPE node itself. */
4784 tree link;
4786 for (link = last_function_parm_tags;
4787 link;
4788 link = TREE_CHAIN (link))
4789 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4792 else if (TREE_CODE (declarator) == INDIRECT_REF)
4794 /* Merge any constancy or volatility into the target type
4795 for the pointer. */
4797 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4798 && type_quals)
4799 pedwarn ("ISO C forbids qualified function types");
4800 if (type_quals)
4801 type = c_build_qualified_type (type, type_quals);
4802 type_quals = TYPE_UNQUALIFIED;
4803 size_varies = 0;
4805 type = build_pointer_type (type);
4807 /* Process a list of type modifier keywords
4808 (such as const or volatile) that were given inside the `*'. */
4810 if (TREE_TYPE (declarator))
4812 tree typemodlist;
4813 int erred = 0;
4815 constp = 0;
4816 volatilep = 0;
4817 restrictp = 0;
4818 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4819 typemodlist = TREE_CHAIN (typemodlist))
4821 tree qualifier = TREE_VALUE (typemodlist);
4823 if (C_IS_RESERVED_WORD (qualifier))
4825 if (C_RID_CODE (qualifier) == RID_CONST)
4826 constp++;
4827 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4828 volatilep++;
4829 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4830 restrictp++;
4831 else
4832 erred++;
4834 else
4835 erred++;
4838 if (erred)
4839 error ("invalid type modifier within pointer declarator");
4840 if (constp > 1 && ! flag_isoc99)
4841 pedwarn ("duplicate `const'");
4842 if (volatilep > 1 && ! flag_isoc99)
4843 pedwarn ("duplicate `volatile'");
4844 if (restrictp > 1 && ! flag_isoc99)
4845 pedwarn ("duplicate `restrict'");
4847 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4848 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4849 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4852 declarator = TREE_OPERAND (declarator, 0);
4854 else
4855 abort ();
4859 /* Now TYPE has the actual type. */
4861 /* Did array size calculations overflow? */
4863 if (TREE_CODE (type) == ARRAY_TYPE
4864 && COMPLETE_TYPE_P (type)
4865 && TREE_OVERFLOW (TYPE_SIZE (type)))
4867 error ("size of array `%s' is too large", name);
4868 /* If we proceed with the array type as it is, we'll eventually
4869 crash in tree_low_cst(). */
4870 type = error_mark_node;
4873 /* If this is declaring a typedef name, return a TYPE_DECL. */
4875 if (specbits & (1 << (int) RID_TYPEDEF))
4877 tree decl;
4878 /* Note that the grammar rejects storage classes
4879 in typenames, fields or parameters */
4880 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4881 && type_quals)
4882 pedwarn ("ISO C forbids qualified function types");
4883 if (type_quals)
4884 type = c_build_qualified_type (type, type_quals);
4885 decl = build_decl (TYPE_DECL, declarator, type);
4886 if ((specbits & (1 << (int) RID_SIGNED))
4887 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4888 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4889 decl_attributes (&decl, returned_attrs, 0);
4890 return decl;
4893 /* Detect the case of an array type of unspecified size
4894 which came, as such, direct from a typedef name.
4895 We must copy the type, so that each identifier gets
4896 a distinct type, so that each identifier's size can be
4897 controlled separately by its own initializer. */
4899 if (type != 0 && typedef_type != 0
4900 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4901 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4903 type = build_array_type (TREE_TYPE (type), 0);
4904 if (size_varies)
4905 C_TYPE_VARIABLE_SIZE (type) = 1;
4908 /* If this is a type name (such as, in a cast or sizeof),
4909 compute the type and return it now. */
4911 if (decl_context == TYPENAME)
4913 /* Note that the grammar rejects storage classes
4914 in typenames, fields or parameters */
4915 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4916 && type_quals)
4917 pedwarn ("ISO C forbids const or volatile function types");
4918 if (type_quals)
4919 type = c_build_qualified_type (type, type_quals);
4920 decl_attributes (&type, returned_attrs, 0);
4921 return type;
4924 /* Aside from typedefs and type names (handle above),
4925 `void' at top level (not within pointer)
4926 is allowed only in public variables.
4927 We don't complain about parms either, but that is because
4928 a better error message can be made later. */
4930 if (VOID_TYPE_P (type) && decl_context != PARM
4931 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4932 && ((specbits & (1 << (int) RID_EXTERN))
4933 || (current_binding_level == global_binding_level
4934 && !(specbits
4935 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4937 error ("variable or field `%s' declared void", name);
4938 type = integer_type_node;
4941 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4942 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4945 tree decl;
4947 if (decl_context == PARM)
4949 tree type_as_written;
4950 tree promoted_type;
4952 /* A parameter declared as an array of T is really a pointer to T.
4953 One declared as a function is really a pointer to a function. */
4955 if (TREE_CODE (type) == ARRAY_TYPE)
4957 /* Transfer const-ness of array into that of type pointed to. */
4958 type = TREE_TYPE (type);
4959 if (type_quals)
4960 type = c_build_qualified_type (type, type_quals);
4961 type = build_pointer_type (type);
4962 type_quals = TYPE_UNQUALIFIED;
4963 if (array_ptr_quals)
4965 tree new_ptr_quals, new_ptr_attrs;
4966 int erred = 0;
4967 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4968 /* We don't yet implement attributes in this context. */
4969 if (new_ptr_attrs != NULL_TREE)
4970 warning ("attributes in parameter array declarator ignored");
4972 constp = 0;
4973 volatilep = 0;
4974 restrictp = 0;
4975 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4977 tree qualifier = TREE_VALUE (new_ptr_quals);
4979 if (C_IS_RESERVED_WORD (qualifier))
4981 if (C_RID_CODE (qualifier) == RID_CONST)
4982 constp++;
4983 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4984 volatilep++;
4985 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4986 restrictp++;
4987 else
4988 erred++;
4990 else
4991 erred++;
4994 if (erred)
4995 error ("invalid type modifier within array declarator");
4997 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4998 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4999 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
5001 size_varies = 0;
5003 else if (TREE_CODE (type) == FUNCTION_TYPE)
5005 if (pedantic && type_quals)
5006 pedwarn ("ISO C forbids qualified function types");
5007 if (type_quals)
5008 type = c_build_qualified_type (type, type_quals);
5009 type = build_pointer_type (type);
5010 type_quals = TYPE_UNQUALIFIED;
5012 else if (type_quals)
5013 type = c_build_qualified_type (type, type_quals);
5015 type_as_written = type;
5017 decl = build_decl (PARM_DECL, declarator, type);
5018 if (size_varies)
5019 C_DECL_VARIABLE_SIZE (decl) = 1;
5021 /* Compute the type actually passed in the parmlist,
5022 for the case where there is no prototype.
5023 (For example, shorts and chars are passed as ints.)
5024 When there is a prototype, this is overridden later. */
5026 if (type == error_mark_node)
5027 promoted_type = type;
5028 else
5030 promoted_type = simple_type_promotes_to (type);
5031 if (! promoted_type)
5032 promoted_type = type;
5035 DECL_ARG_TYPE (decl) = promoted_type;
5036 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5038 else if (decl_context == FIELD)
5040 /* Structure field. It may not be a function. */
5042 if (TREE_CODE (type) == FUNCTION_TYPE)
5044 error ("field `%s' declared as a function", name);
5045 type = build_pointer_type (type);
5047 else if (TREE_CODE (type) != ERROR_MARK
5048 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
5050 error ("field `%s' has incomplete type", name);
5051 type = error_mark_node;
5053 /* Move type qualifiers down to element of an array. */
5054 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5056 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5057 type_quals),
5058 TYPE_DOMAIN (type));
5059 #if 0
5060 /* Leave the field const or volatile as well. */
5061 type_quals = TYPE_UNQUALIFIED;
5062 #endif
5064 decl = build_decl (FIELD_DECL, declarator, type);
5065 DECL_NONADDRESSABLE_P (decl) = bitfield;
5067 if (size_varies)
5068 C_DECL_VARIABLE_SIZE (decl) = 1;
5070 else if (TREE_CODE (type) == FUNCTION_TYPE)
5072 /* Every function declaration is "external"
5073 except for those which are inside a function body
5074 in which `auto' is used.
5075 That is a case not specified by ANSI C,
5076 and we use it for forward declarations for nested functions. */
5077 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5078 || current_binding_level == global_binding_level);
5080 if (specbits & (1 << (int) RID_AUTO)
5081 && (pedantic || current_binding_level == global_binding_level))
5082 pedwarn ("invalid storage class for function `%s'", name);
5083 if (specbits & (1 << (int) RID_REGISTER))
5084 error ("invalid storage class for function `%s'", name);
5085 /* Function declaration not at top level.
5086 Storage classes other than `extern' are not allowed
5087 and `extern' makes no difference. */
5088 if (current_binding_level != global_binding_level
5089 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5090 && pedantic)
5091 pedwarn ("invalid storage class for function `%s'", name);
5093 decl = build_decl (FUNCTION_DECL, declarator, type);
5094 decl = build_decl_attribute_variant (decl, decl_attr);
5096 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
5097 ggc_alloc_cleared (sizeof (struct lang_decl));
5099 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
5100 pedwarn ("ISO C forbids qualified function types");
5102 /* GNU C interprets a `volatile void' return type to indicate
5103 that the function does not return. */
5104 if ((type_quals & TYPE_QUAL_VOLATILE)
5105 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
5106 warning ("`noreturn' function returns non-void value");
5108 if (extern_ref)
5109 DECL_EXTERNAL (decl) = 1;
5110 /* Record absence of global scope for `static' or `auto'. */
5111 TREE_PUBLIC (decl)
5112 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5114 if (defaulted_int)
5115 C_FUNCTION_IMPLICIT_INT (decl) = 1;
5117 /* Record presence of `inline', if it is reasonable. */
5118 if (MAIN_NAME_P (declarator))
5120 if (inlinep)
5121 warning ("cannot inline function `main'");
5123 else if (inlinep)
5125 /* Assume that otherwise the function can be inlined. */
5126 DECL_DECLARED_INLINE_P (decl) = 1;
5128 /* Do not mark bare declarations as DECL_INLINE. Doing so
5129 in the presence of multiple declarations can result in
5130 the abstract origin pointing between the declarations,
5131 which will confuse dwarf2out. */
5132 if (initialized)
5134 DECL_INLINE (decl) = 1;
5135 if (specbits & (1 << (int) RID_EXTERN))
5136 current_extern_inline = 1;
5139 /* If -finline-functions, assume it can be inlined. This does
5140 two things: let the function be deferred until it is actually
5141 needed, and let dwarf2 know that the function is inlinable. */
5142 else if (flag_inline_trees == 2 && initialized)
5144 DECL_INLINE (decl) = 1;
5145 DECL_DECLARED_INLINE_P (decl) = 0;
5148 else
5150 /* It's a variable. */
5151 /* An uninitialized decl with `extern' is a reference. */
5152 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5154 /* Move type qualifiers down to element of an array. */
5155 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5157 int saved_align = TYPE_ALIGN(type);
5158 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5159 type_quals),
5160 TYPE_DOMAIN (type));
5161 TYPE_ALIGN (type) = saved_align;
5162 #if 0 /* Leave the variable const or volatile as well. */
5163 type_quals = TYPE_UNQUALIFIED;
5164 #endif
5166 else if (type_quals)
5167 type = c_build_qualified_type (type, type_quals);
5169 decl = build_decl (VAR_DECL, declarator, type);
5170 if (size_varies)
5171 C_DECL_VARIABLE_SIZE (decl) = 1;
5173 if (inlinep)
5174 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5176 DECL_EXTERNAL (decl) = extern_ref;
5177 /* At top level, the presence of a `static' or `register' storage
5178 class specifier, or the absence of all storage class specifiers
5179 makes this declaration a definition (perhaps tentative). Also,
5180 the absence of both `static' and `register' makes it public. */
5181 if (current_binding_level == global_binding_level)
5183 TREE_PUBLIC (decl)
5184 = !(specbits
5185 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5186 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5188 /* Not at top level, only `static' makes a static definition. */
5189 else
5191 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5192 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5196 /* Record `register' declaration for warnings on &
5197 and in case doing stupid register allocation. */
5199 if (specbits & (1 << (int) RID_REGISTER))
5200 DECL_REGISTER (decl) = 1;
5202 /* Record constancy and volatility. */
5203 c_apply_type_quals_to_decl (type_quals, decl);
5205 /* If a type has volatile components, it should be stored in memory.
5206 Otherwise, the fact that those components are volatile
5207 will be ignored, and would even crash the compiler. */
5208 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5209 mark_addressable (decl);
5211 decl_attributes (&decl, returned_attrs, 0);
5213 return decl;
5217 /* Decode the parameter-list info for a function type or function definition.
5218 The argument is the value returned by `get_parm_info' (or made in parse.y
5219 if there is an identifier list instead of a parameter decl list).
5220 These two functions are separate because when a function returns
5221 or receives functions then each is called multiple times but the order
5222 of calls is different. The last call to `grokparms' is always the one
5223 that contains the formal parameter names of a function definition.
5225 Store in `last_function_parms' a chain of the decls of parms.
5226 Also store in `last_function_parm_tags' a chain of the struct, union,
5227 and enum tags declared among the parms.
5229 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5231 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5232 a mere declaration. A nonempty identifier-list gets an error message
5233 when FUNCDEF_FLAG is zero. */
5235 static tree
5236 grokparms (parms_info, funcdef_flag)
5237 tree parms_info;
5238 int funcdef_flag;
5240 tree first_parm = TREE_CHAIN (parms_info);
5242 last_function_parms = TREE_PURPOSE (parms_info);
5243 last_function_parm_tags = TREE_VALUE (parms_info);
5245 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5246 && !in_system_header)
5247 warning ("function declaration isn't a prototype");
5249 if (first_parm != 0
5250 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5252 if (! funcdef_flag)
5253 pedwarn ("parameter names (without types) in function declaration");
5255 last_function_parms = first_parm;
5256 return 0;
5258 else
5260 tree parm;
5261 tree typelt;
5262 /* We no longer test FUNCDEF_FLAG.
5263 If the arg types are incomplete in a declaration,
5264 they must include undefined tags.
5265 These tags can never be defined in the scope of the declaration,
5266 so the types can never be completed,
5267 and no call can be compiled successfully. */
5268 #if 0
5269 /* In a fcn definition, arg types must be complete. */
5270 if (funcdef_flag)
5271 #endif
5272 for (parm = last_function_parms, typelt = first_parm;
5273 parm;
5274 parm = TREE_CHAIN (parm))
5275 /* Skip over any enumeration constants declared here. */
5276 if (TREE_CODE (parm) == PARM_DECL)
5278 /* Barf if the parameter itself has an incomplete type. */
5279 tree type = TREE_VALUE (typelt);
5280 if (type == error_mark_node)
5281 continue;
5282 if (!COMPLETE_TYPE_P (type))
5284 if (funcdef_flag && DECL_NAME (parm) != 0)
5285 error ("parameter `%s' has incomplete type",
5286 IDENTIFIER_POINTER (DECL_NAME (parm)));
5287 else
5288 warning ("parameter has incomplete type");
5289 if (funcdef_flag)
5291 TREE_VALUE (typelt) = error_mark_node;
5292 TREE_TYPE (parm) = error_mark_node;
5295 #if 0
5296 /* This has been replaced by parm_tags_warning, which
5297 uses a more accurate criterion for what to warn
5298 about. */
5299 else
5301 /* Now warn if is a pointer to an incomplete type. */
5302 while (TREE_CODE (type) == POINTER_TYPE
5303 || TREE_CODE (type) == REFERENCE_TYPE)
5304 type = TREE_TYPE (type);
5305 type = TYPE_MAIN_VARIANT (type);
5306 if (!COMPLETE_TYPE_P (type))
5308 if (DECL_NAME (parm) != 0)
5309 warning ("parameter `%s' points to incomplete type",
5310 IDENTIFIER_POINTER (DECL_NAME (parm)));
5311 else
5312 warning ("parameter points to incomplete type");
5315 #endif
5316 typelt = TREE_CHAIN (typelt);
5319 return first_parm;
5323 /* Return a tree_list node with info on a parameter list just parsed.
5324 The TREE_PURPOSE is a chain of decls of those parms.
5325 The TREE_VALUE is a list of structure, union and enum tags defined.
5326 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5327 This tree_list node is later fed to `grokparms'.
5329 VOID_AT_END nonzero means append `void' to the end of the type-list.
5330 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5332 tree
5333 get_parm_info (void_at_end)
5334 int void_at_end;
5336 tree decl, t;
5337 tree types = 0;
5338 int erred = 0;
5339 tree tags = gettags ();
5340 tree parms = getdecls ();
5341 tree new_parms = 0;
5342 tree order = current_binding_level->parm_order;
5344 /* Just `void' (and no ellipsis) is special. There are really no parms.
5345 But if the `void' is qualified (by `const' or `volatile') or has a
5346 storage class specifier (`register'), then the behavior is undefined;
5347 by not counting it as the special case of `void' we will cause an
5348 error later. Typedefs for `void' are OK (see DR#157). */
5349 if (void_at_end && parms != 0
5350 && TREE_CHAIN (parms) == 0
5351 && VOID_TYPE_P (TREE_TYPE (parms))
5352 && ! TREE_THIS_VOLATILE (parms)
5353 && ! TREE_READONLY (parms)
5354 && ! DECL_REGISTER (parms)
5355 && DECL_NAME (parms) == 0)
5357 parms = NULL_TREE;
5358 storedecls (NULL_TREE);
5359 return tree_cons (NULL_TREE, NULL_TREE,
5360 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5363 /* Extract enumerator values and other non-parms declared with the parms.
5364 Likewise any forward parm decls that didn't have real parm decls. */
5365 for (decl = parms; decl;)
5367 tree next = TREE_CHAIN (decl);
5369 if (TREE_CODE (decl) != PARM_DECL)
5371 TREE_CHAIN (decl) = new_parms;
5372 new_parms = decl;
5374 else if (TREE_ASM_WRITTEN (decl))
5376 error_with_decl (decl,
5377 "parameter `%s' has just a forward declaration");
5378 TREE_CHAIN (decl) = new_parms;
5379 new_parms = decl;
5381 decl = next;
5384 /* Put the parm decls back in the order they were in in the parm list. */
5385 for (t = order; t; t = TREE_CHAIN (t))
5387 if (TREE_CHAIN (t))
5388 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5389 else
5390 TREE_CHAIN (TREE_VALUE (t)) = 0;
5393 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5394 new_parms);
5396 /* Store the parmlist in the binding level since the old one
5397 is no longer a valid list. (We have changed the chain pointers.) */
5398 storedecls (new_parms);
5400 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5401 /* There may also be declarations for enumerators if an enumeration
5402 type is declared among the parms. Ignore them here. */
5403 if (TREE_CODE (decl) == PARM_DECL)
5405 /* Since there is a prototype,
5406 args are passed in their declared types. */
5407 tree type = TREE_TYPE (decl);
5408 DECL_ARG_TYPE (decl) = type;
5409 if (PROMOTE_PROTOTYPES
5410 && INTEGRAL_TYPE_P (type)
5411 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5412 DECL_ARG_TYPE (decl) = integer_type_node;
5414 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5415 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5416 && DECL_NAME (decl) == 0)
5418 error ("`void' in parameter list must be the entire list");
5419 erred = 1;
5423 if (void_at_end)
5424 return tree_cons (new_parms, tags,
5425 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5427 return tree_cons (new_parms, tags, nreverse (types));
5430 /* At end of parameter list, warn about any struct, union or enum tags
5431 defined within. Do so because these types cannot ever become complete. */
5433 void
5434 parmlist_tags_warning ()
5436 tree elt;
5437 static int already;
5439 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5441 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5442 /* An anonymous union parm type is meaningful as a GNU extension.
5443 So don't warn for that. */
5444 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5445 continue;
5446 if (TREE_PURPOSE (elt) != 0)
5448 if (code == RECORD_TYPE)
5449 warning ("`struct %s' declared inside parameter list",
5450 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5451 else if (code == UNION_TYPE)
5452 warning ("`union %s' declared inside parameter list",
5453 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5454 else
5455 warning ("`enum %s' declared inside parameter list",
5456 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5458 else
5460 /* For translation these need to be separate warnings */
5461 if (code == RECORD_TYPE)
5462 warning ("anonymous struct declared inside parameter list");
5463 else if (code == UNION_TYPE)
5464 warning ("anonymous union declared inside parameter list");
5465 else
5466 warning ("anonymous enum declared inside parameter list");
5468 if (! already)
5470 warning ("its scope is only this definition or declaration, which is probably not what you want");
5471 already = 1;
5476 /* Get the struct, enum or union (CODE says which) with tag NAME.
5477 Define the tag as a forward-reference if it is not defined. */
5479 tree
5480 xref_tag (code, name)
5481 enum tree_code code;
5482 tree name;
5484 /* If a cross reference is requested, look up the type
5485 already defined for this tag and return it. */
5487 tree ref = lookup_tag (code, name, current_binding_level, 0);
5488 /* If this is the right type of tag, return what we found.
5489 (This reference will be shadowed by shadow_tag later if appropriate.)
5490 If this is the wrong type of tag, do not return it. If it was the
5491 wrong type in the same binding level, we will have had an error
5492 message already; if in a different binding level and declaring
5493 a name, pending_xref_error will give an error message; but if in a
5494 different binding level and not declaring a name, this tag should
5495 shadow the previous declaration of a different type of tag, and
5496 this would not work properly if we return the reference found.
5497 (For example, with "struct foo" in an outer scope, "union foo;"
5498 must shadow that tag with a new one of union type.) */
5499 if (ref && TREE_CODE (ref) == code)
5500 return ref;
5502 /* If no such tag is yet defined, create a forward-reference node
5503 and record it as the "definition".
5504 When a real declaration of this type is found,
5505 the forward-reference will be altered into a real type. */
5507 ref = make_node (code);
5508 if (code == ENUMERAL_TYPE)
5510 /* Give the type a default layout like unsigned int
5511 to avoid crashing if it does not get defined. */
5512 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5513 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5514 TYPE_USER_ALIGN (ref) = 0;
5515 TREE_UNSIGNED (ref) = 1;
5516 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5517 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5518 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5521 pushtag (name, ref);
5523 return ref;
5526 /* Make sure that the tag NAME is defined *in the current binding level*
5527 at least as a forward reference.
5528 CODE says which kind of tag NAME ought to be. */
5530 tree
5531 start_struct (code, name)
5532 enum tree_code code;
5533 tree name;
5535 /* If there is already a tag defined at this binding level
5536 (as a forward reference), just return it. */
5538 tree ref = 0;
5540 if (name != 0)
5541 ref = lookup_tag (code, name, current_binding_level, 1);
5542 if (ref && TREE_CODE (ref) == code)
5544 C_TYPE_BEING_DEFINED (ref) = 1;
5545 TYPE_PACKED (ref) = flag_pack_struct;
5546 if (TYPE_FIELDS (ref))
5548 if (code == UNION_TYPE)
5549 error ("redefinition of `union %s'",
5550 IDENTIFIER_POINTER (name));
5551 else
5552 error ("redefinition of `struct %s'",
5553 IDENTIFIER_POINTER (name));
5556 return ref;
5559 /* Otherwise create a forward-reference just so the tag is in scope. */
5561 ref = make_node (code);
5562 pushtag (name, ref);
5563 C_TYPE_BEING_DEFINED (ref) = 1;
5564 TYPE_PACKED (ref) = flag_pack_struct;
5565 return ref;
5568 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5569 of a structure component, returning a FIELD_DECL node.
5570 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5572 This is done during the parsing of the struct declaration.
5573 The FIELD_DECL nodes are chained together and the lot of them
5574 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5576 tree
5577 grokfield (filename, line, declarator, declspecs, width)
5578 const char *filename ATTRIBUTE_UNUSED;
5579 int line ATTRIBUTE_UNUSED;
5580 tree declarator, declspecs, width;
5582 tree value;
5584 if (declarator == NULL_TREE && width == NULL_TREE)
5586 /* This is an unnamed decl. We only support unnamed
5587 structs/unions, so check for other things and refuse them. */
5588 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5589 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5591 error ("unnamed fields of type other than struct or union are not allowed");
5592 return NULL_TREE;
5596 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5598 finish_decl (value, NULL_TREE, NULL_TREE);
5599 DECL_INITIAL (value) = width;
5601 maybe_objc_check_decl (value);
5602 return value;
5605 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5606 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5607 ATTRIBUTES are attributes to be applied to the structure. */
5609 tree
5610 finish_struct (t, fieldlist, attributes)
5611 tree t;
5612 tree fieldlist;
5613 tree attributes;
5615 tree x;
5616 int toplevel = global_binding_level == current_binding_level;
5617 int saw_named_field;
5619 /* If this type was previously laid out as a forward reference,
5620 make sure we lay it out again. */
5622 TYPE_SIZE (t) = 0;
5624 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5626 /* Nameless union parm types are useful as GCC extension. */
5627 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5628 /* Otherwise, warn about any struct or union def. in parmlist. */
5629 if (in_parm_level_p ())
5631 if (pedantic)
5632 pedwarn ("%s defined inside parms",
5633 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5634 else if (! flag_traditional)
5635 warning ("%s defined inside parms",
5636 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5639 if (pedantic)
5641 for (x = fieldlist; x; x = TREE_CHAIN (x))
5642 if (DECL_NAME (x) != 0)
5643 break;
5645 if (x == 0)
5646 pedwarn ("%s has no %s",
5647 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5648 fieldlist ? _("named members") : _("members"));
5651 /* Install struct as DECL_CONTEXT of each field decl.
5652 Also process specified field sizes,m which is found in the DECL_INITIAL.
5653 Store 0 there, except for ": 0" fields (so we can find them
5654 and delete them, below). */
5656 saw_named_field = 0;
5657 for (x = fieldlist; x; x = TREE_CHAIN (x))
5659 DECL_CONTEXT (x) = t;
5660 DECL_PACKED (x) |= TYPE_PACKED (t);
5662 /* If any field is const, the structure type is pseudo-const. */
5663 if (TREE_READONLY (x))
5664 C_TYPE_FIELDS_READONLY (t) = 1;
5665 else
5667 /* A field that is pseudo-const makes the structure likewise. */
5668 tree t1 = TREE_TYPE (x);
5669 while (TREE_CODE (t1) == ARRAY_TYPE)
5670 t1 = TREE_TYPE (t1);
5671 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5672 && C_TYPE_FIELDS_READONLY (t1))
5673 C_TYPE_FIELDS_READONLY (t) = 1;
5676 /* Any field that is volatile means variables of this type must be
5677 treated in some ways as volatile. */
5678 if (TREE_THIS_VOLATILE (x))
5679 C_TYPE_FIELDS_VOLATILE (t) = 1;
5681 /* Any field of nominal variable size implies structure is too. */
5682 if (C_DECL_VARIABLE_SIZE (x))
5683 C_TYPE_VARIABLE_SIZE (t) = 1;
5685 /* Detect invalid nested redefinition. */
5686 if (TREE_TYPE (x) == t)
5687 error ("nested redefinition of `%s'",
5688 IDENTIFIER_POINTER (TYPE_NAME (t)));
5690 /* Detect invalid bit-field size. */
5691 if (DECL_INITIAL (x))
5692 STRIP_NOPS (DECL_INITIAL (x));
5693 if (DECL_INITIAL (x))
5695 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5696 constant_expression_warning (DECL_INITIAL (x));
5697 else
5699 error_with_decl (x,
5700 "bit-field `%s' width not an integer constant");
5701 DECL_INITIAL (x) = NULL;
5705 /* Detect invalid bit-field type. */
5706 if (DECL_INITIAL (x)
5707 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5708 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5709 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5711 error_with_decl (x, "bit-field `%s' has invalid type");
5712 DECL_INITIAL (x) = NULL;
5715 if (DECL_INITIAL (x) && pedantic
5716 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5717 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5718 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5719 /* Accept an enum that's equivalent to int or unsigned int. */
5720 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5721 && (TYPE_PRECISION (TREE_TYPE (x))
5722 == TYPE_PRECISION (integer_type_node))))
5723 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5725 /* Detect and ignore out of range field width and process valid
5726 field widths. */
5727 if (DECL_INITIAL (x))
5729 int max_width
5730 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5731 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5733 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5734 error_with_decl (x, "negative width in bit-field `%s'");
5735 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5736 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5737 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5738 error_with_decl (x, "zero width for bit-field `%s'");
5739 else
5741 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5742 unsigned HOST_WIDE_INT width
5743 = tree_low_cst (DECL_INITIAL (x), 1);
5745 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5746 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5747 TREE_UNSIGNED (TREE_TYPE (x)))
5748 || (width
5749 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5750 TREE_UNSIGNED (TREE_TYPE (x))))))
5751 warning_with_decl (x,
5752 "`%s' is narrower than values of its type");
5754 DECL_SIZE (x) = bitsize_int (width);
5755 DECL_BIT_FIELD (x) = 1;
5756 SET_DECL_C_BIT_FIELD (x);
5758 if (width == 0
5759 && ! (* targetm.ms_bitfield_layout_p) (t))
5761 /* field size 0 => force desired amount of alignment. */
5762 #ifdef EMPTY_FIELD_BOUNDARY
5763 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5764 #endif
5765 #ifdef PCC_BITFIELD_TYPE_MATTERS
5766 if (PCC_BITFIELD_TYPE_MATTERS)
5768 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5769 TYPE_ALIGN (TREE_TYPE (x)));
5770 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5772 #endif
5777 else if (TREE_TYPE (x) != error_mark_node)
5779 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5780 : TYPE_ALIGN (TREE_TYPE (x)));
5782 /* Non-bit-fields are aligned for their type, except packed
5783 fields which require only BITS_PER_UNIT alignment. */
5784 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5785 if (! DECL_PACKED (x))
5786 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5789 DECL_INITIAL (x) = 0;
5791 /* Detect flexible array member in an invalid context. */
5792 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5793 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5794 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5795 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5797 if (TREE_CODE (t) == UNION_TYPE)
5798 error_with_decl (x, "flexible array member in union");
5799 else if (TREE_CHAIN (x) != NULL_TREE)
5800 error_with_decl (x, "flexible array member not at end of struct");
5801 else if (! saw_named_field)
5802 error_with_decl (x, "flexible array member in otherwise empty struct");
5804 if (DECL_NAME (x))
5805 saw_named_field = 1;
5808 /* Delete all duplicate fields from the fieldlist */
5809 for (x = fieldlist; x && TREE_CHAIN (x);)
5810 /* Anonymous fields aren't duplicates. */
5811 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5812 x = TREE_CHAIN (x);
5813 else
5815 tree y = fieldlist;
5817 while (1)
5819 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5820 break;
5821 if (y == x)
5822 break;
5823 y = TREE_CHAIN (y);
5825 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5827 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5828 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5830 else
5831 x = TREE_CHAIN (x);
5834 /* Now we have the nearly final fieldlist. Record it,
5835 then lay out the structure or union (including the fields). */
5837 TYPE_FIELDS (t) = fieldlist;
5839 layout_type (t);
5841 /* Delete all zero-width bit-fields from the fieldlist */
5843 tree *fieldlistp = &fieldlist;
5844 while (*fieldlistp)
5845 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5846 *fieldlistp = TREE_CHAIN (*fieldlistp);
5847 else
5848 fieldlistp = &TREE_CHAIN (*fieldlistp);
5851 /* Now we have the truly final field list.
5852 Store it in this type and in the variants. */
5854 TYPE_FIELDS (t) = fieldlist;
5856 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5858 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5859 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5860 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5861 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5864 /* If this was supposed to be a transparent union, but we can't
5865 make it one, warn and turn off the flag. */
5866 if (TREE_CODE (t) == UNION_TYPE
5867 && TYPE_TRANSPARENT_UNION (t)
5868 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5870 TYPE_TRANSPARENT_UNION (t) = 0;
5871 warning ("union cannot be made transparent");
5874 /* If this structure or union completes the type of any previous
5875 variable declaration, lay it out and output its rtl. */
5877 if (current_binding_level->n_incomplete != 0)
5879 tree decl;
5880 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5882 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5883 && TREE_CODE (decl) != TYPE_DECL)
5885 layout_decl (decl, 0);
5886 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5887 maybe_objc_check_decl (decl);
5888 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5889 if (! toplevel)
5890 expand_decl (decl);
5891 if (--current_binding_level->n_incomplete == 0)
5892 break;
5894 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5895 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5897 tree element = TREE_TYPE (decl);
5898 while (TREE_CODE (element) == ARRAY_TYPE)
5899 element = TREE_TYPE (element);
5900 if (element == t)
5902 layout_array_type (TREE_TYPE (decl));
5903 if (TREE_CODE (decl) != TYPE_DECL)
5905 layout_decl (decl, 0);
5906 maybe_objc_check_decl (decl);
5907 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5908 if (! toplevel)
5909 expand_decl (decl);
5911 if (--current_binding_level->n_incomplete == 0)
5912 break;
5918 /* Finish debugging output for this type. */
5919 rest_of_type_compilation (t, toplevel);
5921 return t;
5924 /* Lay out the type T, and its element type, and so on. */
5926 static void
5927 layout_array_type (t)
5928 tree t;
5930 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5931 layout_array_type (TREE_TYPE (t));
5932 layout_type (t);
5935 /* Begin compiling the definition of an enumeration type.
5936 NAME is its name (or null if anonymous).
5937 Returns the type object, as yet incomplete.
5938 Also records info about it so that build_enumerator
5939 may be used to declare the individual values as they are read. */
5941 tree
5942 start_enum (name)
5943 tree name;
5945 tree enumtype = 0;
5947 /* If this is the real definition for a previous forward reference,
5948 fill in the contents in the same object that used to be the
5949 forward reference. */
5951 if (name != 0)
5952 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5954 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5956 enumtype = make_node (ENUMERAL_TYPE);
5957 pushtag (name, enumtype);
5960 C_TYPE_BEING_DEFINED (enumtype) = 1;
5962 if (TYPE_VALUES (enumtype) != 0)
5964 /* This enum is a named one that has been declared already. */
5965 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5967 /* Completely replace its old definition.
5968 The old enumerators remain defined, however. */
5969 TYPE_VALUES (enumtype) = 0;
5972 enum_next_value = integer_zero_node;
5973 enum_overflow = 0;
5975 if (flag_short_enums)
5976 TYPE_PACKED (enumtype) = 1;
5978 return enumtype;
5981 /* After processing and defining all the values of an enumeration type,
5982 install their decls in the enumeration type and finish it off.
5983 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5984 and ATTRIBUTES are the specified attributes.
5985 Returns ENUMTYPE. */
5987 tree
5988 finish_enum (enumtype, values, attributes)
5989 tree enumtype;
5990 tree values;
5991 tree attributes;
5993 tree pair, tem;
5994 tree minnode = 0, maxnode = 0, enum_value_type;
5995 int precision, unsign;
5996 int toplevel = (global_binding_level == current_binding_level);
5998 if (in_parm_level_p ())
5999 warning ("enum defined inside parms");
6001 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
6003 /* Calculate the maximum value of any enumerator in this type. */
6005 if (values == error_mark_node)
6006 minnode = maxnode = integer_zero_node;
6007 else
6009 minnode = maxnode = TREE_VALUE (values);
6010 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
6012 tree value = TREE_VALUE (pair);
6013 if (tree_int_cst_lt (maxnode, value))
6014 maxnode = value;
6015 if (tree_int_cst_lt (value, minnode))
6016 minnode = value;
6020 /* Construct the final type of this enumeration. It is the same
6021 as one of the integral types - the narrowest one that fits, except
6022 that normally we only go as narrow as int - and signed iff any of
6023 the values are negative. */
6024 unsign = (tree_int_cst_sgn (minnode) >= 0);
6025 precision = MAX (min_precision (minnode, unsign),
6026 min_precision (maxnode, unsign));
6027 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6029 tree narrowest = type_for_size (precision, unsign);
6030 if (narrowest == 0)
6032 warning ("enumeration values exceed range of largest integer");
6033 narrowest = long_long_integer_type_node;
6036 precision = TYPE_PRECISION (narrowest);
6038 else
6039 precision = TYPE_PRECISION (integer_type_node);
6041 if (precision == TYPE_PRECISION (integer_type_node))
6042 enum_value_type = type_for_size (precision, 0);
6043 else
6044 enum_value_type = enumtype;
6046 TYPE_MIN_VALUE (enumtype) = minnode;
6047 TYPE_MAX_VALUE (enumtype) = maxnode;
6048 TYPE_PRECISION (enumtype) = precision;
6049 TREE_UNSIGNED (enumtype) = unsign;
6050 TYPE_SIZE (enumtype) = 0;
6051 layout_type (enumtype);
6053 if (values != error_mark_node)
6055 /* Change the type of the enumerators to be the enum type. We
6056 need to do this irrespective of the size of the enum, for
6057 proper type checking. Replace the DECL_INITIALs of the
6058 enumerators, and the value slots of the list, with copies
6059 that have the enum type; they cannot be modified in place
6060 because they may be shared (e.g. integer_zero_node) Finally,
6061 change the purpose slots to point to the names of the decls. */
6062 for (pair = values; pair; pair = TREE_CHAIN (pair))
6064 tree enu = TREE_PURPOSE (pair);
6066 TREE_TYPE (enu) = enumtype;
6067 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
6068 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
6069 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
6070 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
6071 DECL_MODE (enu) = TYPE_MODE (enumtype);
6073 /* The ISO C Standard mandates enumerators to have type int,
6074 even though the underlying type of an enum type is
6075 unspecified. Here we convert any enumerators that fit in
6076 an int to type int, to avoid promotions to unsigned types
6077 when comparing integers with enumerators that fit in the
6078 int range. When -pedantic is given, build_enumerator()
6079 would have already taken care of those that don't fit. */
6080 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
6081 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
6082 else
6083 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
6085 TREE_PURPOSE (pair) = DECL_NAME (enu);
6086 TREE_VALUE (pair) = DECL_INITIAL (enu);
6089 TYPE_VALUES (enumtype) = values;
6092 /* Fix up all variant types of this enum type. */
6093 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6095 if (tem == enumtype)
6096 continue;
6097 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6098 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6099 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6100 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6101 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6102 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6103 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6104 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6105 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
6106 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6109 /* Finish debugging output for this type. */
6110 rest_of_type_compilation (enumtype, toplevel);
6112 return enumtype;
6115 /* Build and install a CONST_DECL for one value of the
6116 current enumeration type (one that was begun with start_enum).
6117 Return a tree-list containing the CONST_DECL and its value.
6118 Assignment of sequential values by default is handled here. */
6120 tree
6121 build_enumerator (name, value)
6122 tree name, value;
6124 tree decl, type;
6126 /* Validate and default VALUE. */
6128 /* Remove no-op casts from the value. */
6129 if (value)
6130 STRIP_TYPE_NOPS (value);
6132 if (value != 0)
6134 if (TREE_CODE (value) == INTEGER_CST)
6136 value = default_conversion (value);
6137 constant_expression_warning (value);
6139 else
6141 error ("enumerator value for `%s' not integer constant",
6142 IDENTIFIER_POINTER (name));
6143 value = 0;
6147 /* Default based on previous value. */
6148 /* It should no longer be possible to have NON_LVALUE_EXPR
6149 in the default. */
6150 if (value == 0)
6152 value = enum_next_value;
6153 if (enum_overflow)
6154 error ("overflow in enumeration values");
6157 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6159 pedwarn ("ISO C restricts enumerator values to range of `int'");
6160 value = convert (integer_type_node, value);
6163 /* Set basis for default for next value. */
6164 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6165 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6167 /* Now create a declaration for the enum value name. */
6169 type = TREE_TYPE (value);
6170 type = type_for_size (MAX (TYPE_PRECISION (type),
6171 TYPE_PRECISION (integer_type_node)),
6172 ((flag_traditional
6173 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6174 && TREE_UNSIGNED (type)));
6176 decl = build_decl (CONST_DECL, name, type);
6177 DECL_INITIAL (decl) = convert (type, value);
6178 pushdecl (decl);
6180 return tree_cons (decl, value, NULL_TREE);
6184 /* Create the FUNCTION_DECL for a function definition.
6185 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6186 the declaration; they describe the function's name and the type it returns,
6187 but twisted together in a fashion that parallels the syntax of C.
6189 This function creates a binding context for the function body
6190 as well as setting up the FUNCTION_DECL in current_function_decl.
6192 Returns 1 on success. If the DECLARATOR is not suitable for a function
6193 (it defines a datum instead), we return 0, which tells
6194 yyparse to report a parse error. */
6197 start_function (declspecs, declarator, attributes)
6198 tree declarator, declspecs, attributes;
6200 tree decl1, old_decl;
6201 tree restype;
6202 int old_immediate_size_expand = immediate_size_expand;
6204 current_function_returns_value = 0; /* Assume, until we see it does. */
6205 current_function_returns_null = 0;
6206 current_function_returns_abnormally = 0;
6207 warn_about_return_type = 0;
6208 current_extern_inline = 0;
6209 c_function_varargs = 0;
6210 named_labels = 0;
6211 shadowed_labels = 0;
6213 /* Don't expand any sizes in the return type of the function. */
6214 immediate_size_expand = 0;
6216 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6218 /* If the declarator is not suitable for a function definition,
6219 cause a syntax error. */
6220 if (decl1 == 0)
6222 immediate_size_expand = old_immediate_size_expand;
6223 return 0;
6226 decl_attributes (&decl1, attributes, 0);
6228 if (DECL_DECLARED_INLINE_P (decl1)
6229 && DECL_UNINLINABLE (decl1)
6230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6231 warning_with_decl (decl1,
6232 "inline function `%s' given attribute noinline");
6234 announce_function (decl1);
6236 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6238 error ("return type is an incomplete type");
6239 /* Make it return void instead. */
6240 TREE_TYPE (decl1)
6241 = build_function_type (void_type_node,
6242 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6245 if (warn_about_return_type)
6246 pedwarn_c99 ("return type defaults to `int'");
6248 /* Save the parm names or decls from this function's declarator
6249 where store_parm_decls will find them. */
6250 current_function_parms = last_function_parms;
6251 current_function_parm_tags = last_function_parm_tags;
6253 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6254 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6255 DECL_INITIAL (decl1) = error_mark_node;
6257 /* If this definition isn't a prototype and we had a prototype declaration
6258 before, copy the arg type info from that prototype.
6259 But not if what we had before was a builtin function. */
6260 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6261 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6262 && !DECL_BUILT_IN (old_decl)
6263 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6264 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6265 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6267 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6268 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6269 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6272 /* If there is no explicit declaration, look for any out-of-scope implicit
6273 declarations. */
6274 if (old_decl == 0)
6275 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6277 /* Optionally warn of old-fashioned def with no previous prototype. */
6278 if (warn_strict_prototypes
6279 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6280 && !(old_decl != 0
6281 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6282 || (DECL_BUILT_IN (old_decl)
6283 && ! C_DECL_ANTICIPATED (old_decl)))))
6284 warning ("function declaration isn't a prototype");
6285 /* Optionally warn of any global def with no previous prototype. */
6286 else if (warn_missing_prototypes
6287 && TREE_PUBLIC (decl1)
6288 && !(old_decl != 0
6289 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6290 || (DECL_BUILT_IN (old_decl)
6291 && ! C_DECL_ANTICIPATED (old_decl))))
6292 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6293 warning_with_decl (decl1, "no previous prototype for `%s'");
6294 /* Optionally warn of any def with no previous prototype
6295 if the function has already been used. */
6296 else if (warn_missing_prototypes
6297 && old_decl != 0 && TREE_USED (old_decl)
6298 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6299 warning_with_decl (decl1,
6300 "`%s' was used with no prototype before its definition");
6301 /* Optionally warn of any global def with no previous declaration. */
6302 else if (warn_missing_declarations
6303 && TREE_PUBLIC (decl1)
6304 && old_decl == 0
6305 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6306 warning_with_decl (decl1, "no previous declaration for `%s'");
6307 /* Optionally warn of any def with no previous declaration
6308 if the function has already been used. */
6309 else if (warn_missing_declarations
6310 && old_decl != 0 && TREE_USED (old_decl)
6311 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6312 warning_with_decl (decl1,
6313 "`%s' was used with no declaration before its definition");
6315 /* This is a definition, not a reference.
6316 So normally clear DECL_EXTERNAL.
6317 However, `extern inline' acts like a declaration
6318 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6319 DECL_EXTERNAL (decl1) = current_extern_inline;
6321 /* This function exists in static storage.
6322 (This does not mean `static' in the C sense!) */
6323 TREE_STATIC (decl1) = 1;
6325 /* A nested function is not global. */
6326 if (current_function_decl != 0)
6327 TREE_PUBLIC (decl1) = 0;
6329 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6330 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6332 tree args;
6333 int argct = 0;
6335 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6336 != integer_type_node)
6337 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6339 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6340 args = TREE_CHAIN (args))
6342 tree type = args ? TREE_VALUE (args) : 0;
6344 if (type == void_type_node)
6345 break;
6347 ++argct;
6348 switch (argct)
6350 case 1:
6351 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6352 pedwarn_with_decl (decl1,
6353 "first argument of `%s' should be `int'");
6354 break;
6356 case 2:
6357 if (TREE_CODE (type) != POINTER_TYPE
6358 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6359 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6360 != char_type_node))
6361 pedwarn_with_decl (decl1,
6362 "second argument of `%s' should be `char **'");
6363 break;
6365 case 3:
6366 if (TREE_CODE (type) != POINTER_TYPE
6367 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6368 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6369 != char_type_node))
6370 pedwarn_with_decl (decl1,
6371 "third argument of `%s' should probably be `char **'");
6372 break;
6376 /* It is intentional that this message does not mention the third
6377 argument because it's only mentioned in an appendix of the
6378 standard. */
6379 if (argct > 0 && (argct < 2 || argct > 3))
6380 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6382 if (! TREE_PUBLIC (decl1))
6383 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6386 /* Record the decl so that the function name is defined.
6387 If we already have a decl for this name, and it is a FUNCTION_DECL,
6388 use the old decl. */
6390 current_function_decl = pushdecl (decl1);
6392 pushlevel (0);
6393 declare_parm_level (1);
6394 current_binding_level->subblocks_tag_transparent = 1;
6396 make_decl_rtl (current_function_decl, NULL);
6398 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6399 /* Promote the value to int before returning it. */
6400 if (c_promoting_integer_type_p (restype))
6402 /* It retains unsignedness if traditional
6403 or if not really getting wider. */
6404 if (TREE_UNSIGNED (restype)
6405 && (flag_traditional
6406 || (TYPE_PRECISION (restype)
6407 == TYPE_PRECISION (integer_type_node))))
6408 restype = unsigned_type_node;
6409 else
6410 restype = integer_type_node;
6412 DECL_RESULT (current_function_decl)
6413 = build_decl (RESULT_DECL, NULL_TREE, restype);
6415 /* If this fcn was already referenced via a block-scope `extern' decl
6416 (or an implicit decl), propagate certain information about the usage. */
6417 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6418 TREE_ADDRESSABLE (current_function_decl) = 1;
6420 immediate_size_expand = old_immediate_size_expand;
6422 start_fname_decls ();
6424 return 1;
6427 /* Record that this function is going to be a varargs function.
6428 This is called before store_parm_decls, which is too early
6429 to call mark_varargs directly. */
6431 void
6432 c_mark_varargs ()
6434 c_function_varargs = 1;
6437 /* Store the parameter declarations into the current function declaration.
6438 This is called after parsing the parameter declarations, before
6439 digesting the body of the function.
6441 For an old-style definition, modify the function's type
6442 to specify at least the number of arguments. */
6444 void
6445 store_parm_decls ()
6447 tree fndecl = current_function_decl;
6448 tree parm;
6450 /* This is either a chain of PARM_DECLs (if a prototype was used)
6451 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6452 tree specparms = current_function_parms;
6454 /* This is a list of types declared among parms in a prototype. */
6455 tree parmtags = current_function_parm_tags;
6457 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6458 tree parmdecls = getdecls ();
6460 /* This is a chain of any other decls that came in among the parm
6461 declarations. If a parm is declared with enum {foo, bar} x;
6462 then CONST_DECLs for foo and bar are put here. */
6463 tree nonparms = 0;
6465 /* The function containing FNDECL, if any. */
6466 tree context = decl_function_context (fndecl);
6468 /* Nonzero if this definition is written with a prototype. */
6469 int prototype = 0;
6471 int saved_warn_shadow = warn_shadow;
6473 /* Don't re-emit shadow warnings. */
6474 warn_shadow = 0;
6476 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6478 /* This case is when the function was defined with an ANSI prototype.
6479 The parms already have decls, so we need not do anything here
6480 except record them as in effect
6481 and complain if any redundant old-style parm decls were written. */
6483 tree next;
6484 tree others = 0;
6486 prototype = 1;
6488 if (parmdecls != 0)
6490 tree decl, link;
6492 error_with_decl (fndecl,
6493 "parm types given both in parmlist and separately");
6494 /* Get rid of the erroneous decls; don't keep them on
6495 the list of parms, since they might not be PARM_DECLs. */
6496 for (decl = current_binding_level->names;
6497 decl; decl = TREE_CHAIN (decl))
6498 if (DECL_NAME (decl))
6499 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6500 for (link = current_binding_level->shadowed;
6501 link; link = TREE_CHAIN (link))
6502 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6503 current_binding_level->names = 0;
6504 current_binding_level->shadowed = 0;
6507 specparms = nreverse (specparms);
6508 for (parm = specparms; parm; parm = next)
6510 next = TREE_CHAIN (parm);
6511 if (TREE_CODE (parm) == PARM_DECL)
6513 if (DECL_NAME (parm) == 0)
6514 error_with_decl (parm, "parameter name omitted");
6515 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6516 && VOID_TYPE_P (TREE_TYPE (parm)))
6518 error_with_decl (parm, "parameter `%s' declared void");
6519 /* Change the type to error_mark_node so this parameter
6520 will be ignored by assign_parms. */
6521 TREE_TYPE (parm) = error_mark_node;
6523 pushdecl (parm);
6525 else
6527 /* If we find an enum constant or a type tag,
6528 put it aside for the moment. */
6529 TREE_CHAIN (parm) = 0;
6530 others = chainon (others, parm);
6534 /* Get the decls in their original chain order
6535 and record in the function. */
6536 DECL_ARGUMENTS (fndecl) = getdecls ();
6538 #if 0
6539 /* If this function takes a variable number of arguments,
6540 add a phony parameter to the end of the parm list,
6541 to represent the position of the first unnamed argument. */
6542 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6543 != void_type_node)
6545 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6546 /* Let's hope the address of the unnamed parm
6547 won't depend on its type. */
6548 TREE_TYPE (dummy) = integer_type_node;
6549 DECL_ARG_TYPE (dummy) = integer_type_node;
6550 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6552 #endif
6554 /* Now pushdecl the enum constants. */
6555 for (parm = others; parm; parm = next)
6557 next = TREE_CHAIN (parm);
6558 if (DECL_NAME (parm) == 0)
6560 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6562 else if (TREE_CODE (parm) != PARM_DECL)
6563 pushdecl (parm);
6566 storetags (chainon (parmtags, gettags ()));
6568 else
6570 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6571 each with a parm name as the TREE_VALUE.
6573 PARMDECLS is a chain of declarations for parameters.
6574 Warning! It can also contain CONST_DECLs which are not parameters
6575 but are names of enumerators of any enum types
6576 declared among the parameters.
6578 First match each formal parameter name with its declaration.
6579 Associate decls with the names and store the decls
6580 into the TREE_PURPOSE slots. */
6582 /* We use DECL_WEAK as a flag to show which parameters have been
6583 seen already since it is not used on PARM_DECL or CONST_DECL. */
6584 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6585 DECL_WEAK (parm) = 0;
6587 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6589 tree tail, found = NULL;
6591 if (TREE_VALUE (parm) == 0)
6593 error_with_decl (fndecl,
6594 "parameter name missing from parameter list");
6595 TREE_PURPOSE (parm) = 0;
6596 continue;
6599 /* See if any of the parmdecls specifies this parm by name.
6600 Ignore any enumerator decls. */
6601 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6602 if (DECL_NAME (tail) == TREE_VALUE (parm)
6603 && TREE_CODE (tail) == PARM_DECL)
6605 found = tail;
6606 break;
6609 /* If declaration already marked, we have a duplicate name.
6610 Complain, and don't use this decl twice. */
6611 if (found && DECL_WEAK (found))
6613 error_with_decl (found, "multiple parameters named `%s'");
6614 found = 0;
6617 /* If the declaration says "void", complain and ignore it. */
6618 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6620 error_with_decl (found, "parameter `%s' declared void");
6621 TREE_TYPE (found) = integer_type_node;
6622 DECL_ARG_TYPE (found) = integer_type_node;
6623 layout_decl (found, 0);
6626 /* Traditionally, a parm declared float is actually a double. */
6627 if (found && flag_traditional
6628 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6630 TREE_TYPE (found) = double_type_node;
6631 DECL_ARG_TYPE (found) = double_type_node;
6632 layout_decl (found, 0);
6635 /* If no declaration found, default to int. */
6636 if (!found)
6638 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6639 integer_type_node);
6640 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6641 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6642 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6643 if (flag_isoc99)
6644 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6645 else if (extra_warnings)
6646 warning_with_decl (found, "type of `%s' defaults to `int'");
6647 pushdecl (found);
6650 TREE_PURPOSE (parm) = found;
6652 /* Mark this decl as "already found". */
6653 DECL_WEAK (found) = 1;
6656 /* Put anything which is on the parmdecls chain and which is
6657 not a PARM_DECL onto the list NONPARMS. (The types of
6658 non-parm things which might appear on the list include
6659 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6660 any actual PARM_DECLs not matched with any names. */
6662 nonparms = 0;
6663 for (parm = parmdecls; parm;)
6665 tree next = TREE_CHAIN (parm);
6666 TREE_CHAIN (parm) = 0;
6668 if (TREE_CODE (parm) != PARM_DECL)
6669 nonparms = chainon (nonparms, parm);
6670 else
6672 /* Complain about args with incomplete types. */
6673 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6675 error_with_decl (parm, "parameter `%s' has incomplete type");
6676 TREE_TYPE (parm) = error_mark_node;
6679 if (! DECL_WEAK (parm))
6681 error_with_decl (parm,
6682 "declaration for parameter `%s' but no such parameter");
6683 /* Pretend the parameter was not missing.
6684 This gets us to a standard state and minimizes
6685 further error messages. */
6686 specparms
6687 = chainon (specparms,
6688 tree_cons (parm, NULL_TREE, NULL_TREE));
6692 parm = next;
6695 /* Chain the declarations together in the order of the list of
6696 names. Store that chain in the function decl, replacing the
6697 list of names. */
6698 parm = specparms;
6699 DECL_ARGUMENTS (fndecl) = 0;
6701 tree last;
6702 for (last = 0; parm; parm = TREE_CHAIN (parm))
6703 if (TREE_PURPOSE (parm))
6705 if (last == 0)
6706 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6707 else
6708 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6709 last = TREE_PURPOSE (parm);
6710 TREE_CHAIN (last) = 0;
6714 /* If there was a previous prototype,
6715 set the DECL_ARG_TYPE of each argument according to
6716 the type previously specified, and report any mismatches. */
6718 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6720 tree type;
6721 for (parm = DECL_ARGUMENTS (fndecl),
6722 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6723 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6724 != void_type_node));
6725 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6727 if (parm == 0 || type == 0
6728 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6730 error ("number of arguments doesn't match prototype");
6731 error_with_file_and_line (current_function_prototype_file,
6732 current_function_prototype_line,
6733 "prototype declaration");
6734 break;
6736 /* Type for passing arg must be consistent with that
6737 declared for the arg. ISO C says we take the unqualified
6738 type for parameters declared with qualified type. */
6739 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6740 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6742 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6743 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6745 /* Adjust argument to match prototype. E.g. a previous
6746 `int foo(float);' prototype causes
6747 `int foo(x) float x; {...}' to be treated like
6748 `int foo(float x) {...}'. This is particularly
6749 useful for argument types like uid_t. */
6750 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6752 if (PROMOTE_PROTOTYPES
6753 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6754 && TYPE_PRECISION (TREE_TYPE (parm))
6755 < TYPE_PRECISION (integer_type_node))
6756 DECL_ARG_TYPE (parm) = integer_type_node;
6758 if (pedantic)
6760 pedwarn ("promoted argument `%s' doesn't match prototype",
6761 IDENTIFIER_POINTER (DECL_NAME (parm)));
6762 warning_with_file_and_line
6763 (current_function_prototype_file,
6764 current_function_prototype_line,
6765 "prototype declaration");
6768 /* If -traditional, allow `int' argument to match
6769 `unsigned' prototype. */
6770 else if (! (flag_traditional
6771 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6772 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6774 error ("argument `%s' doesn't match prototype",
6775 IDENTIFIER_POINTER (DECL_NAME (parm)));
6776 error_with_file_and_line (current_function_prototype_file,
6777 current_function_prototype_line,
6778 "prototype declaration");
6782 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6785 /* Otherwise, create a prototype that would match. */
6787 else
6789 tree actual = 0, last = 0, type;
6791 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6793 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6794 if (last)
6795 TREE_CHAIN (last) = type;
6796 else
6797 actual = type;
6798 last = type;
6800 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6801 if (last)
6802 TREE_CHAIN (last) = type;
6803 else
6804 actual = type;
6806 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6807 of the type of this function, but we need to avoid having this
6808 affect the types of other similarly-typed functions, so we must
6809 first force the generation of an identical (but separate) type
6810 node for the relevant function type. The new node we create
6811 will be a variant of the main variant of the original function
6812 type. */
6814 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6816 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6819 /* Now store the final chain of decls for the arguments
6820 as the decl-chain of the current lexical scope.
6821 Put the enumerators in as well, at the front so that
6822 DECL_ARGUMENTS is not modified. */
6824 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6827 /* Make sure the binding level for the top of the function body
6828 gets a BLOCK if there are any in the function.
6829 Otherwise, the dbx output is wrong. */
6831 keep_next_if_subblocks = 1;
6833 /* ??? This might be an improvement,
6834 but needs to be thought about some more. */
6835 #if 0
6836 keep_next_level_flag = 1;
6837 #endif
6839 /* Write a record describing this function definition to the prototypes
6840 file (if requested). */
6842 gen_aux_info_record (fndecl, 1, 0, prototype);
6844 /* Initialize the RTL code for the function. */
6845 init_function_start (fndecl, input_filename, lineno);
6847 /* Begin the statement tree for this function. */
6848 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6850 /* If this is a nested function, save away the sizes of any
6851 variable-size types so that we can expand them when generating
6852 RTL. */
6853 if (context)
6855 tree t;
6857 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6858 = nreverse (get_pending_sizes ());
6859 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6861 t = TREE_CHAIN (t))
6862 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6865 /* This function is being processed in whole-function mode. */
6866 cfun->x_whole_function_mode_p = 1;
6868 /* Even though we're inside a function body, we still don't want to
6869 call expand_expr to calculate the size of a variable-sized array.
6870 We haven't necessarily assigned RTL to all variables yet, so it's
6871 not safe to try to expand expressions involving them. */
6872 immediate_size_expand = 0;
6873 cfun->x_dont_save_pending_sizes_p = 1;
6875 warn_shadow = saved_warn_shadow;
6878 /* Finish up a function declaration and compile that function
6879 all the way to assembler language output. The free the storage
6880 for the function definition.
6882 This is called after parsing the body of the function definition.
6884 NESTED is nonzero if the function being finished is nested in another. */
6886 void
6887 finish_function (nested)
6888 int nested;
6890 tree fndecl = current_function_decl;
6892 /* TREE_READONLY (fndecl) = 1;
6893 This caused &foo to be of type ptr-to-const-function
6894 which then got a warning when stored in a ptr-to-function variable. */
6896 poplevel (1, 0, 1);
6897 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6899 /* Must mark the RESULT_DECL as being in this function. */
6901 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6903 /* Obey `register' declarations if `setjmp' is called in this fn. */
6904 if (flag_traditional && current_function_calls_setjmp)
6906 setjmp_protect (DECL_INITIAL (fndecl));
6907 setjmp_protect_args ();
6910 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6912 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6913 != integer_type_node)
6915 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6916 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6917 if (! warn_main)
6918 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6920 else
6922 #ifdef DEFAULT_MAIN_RETURN
6923 /* Make it so that `main' always returns success by default. */
6924 DEFAULT_MAIN_RETURN;
6925 #else
6926 if (flag_isoc99)
6927 c_expand_return (integer_zero_node);
6928 #endif
6932 finish_fname_decls ();
6934 /* Tie off the statement tree for this function. */
6935 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6937 /* Complain if there's just no return statement. */
6938 if (TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6939 && !current_function_returns_value && !current_function_returns_null
6940 /* Don't complain if we abort. */
6941 && !current_function_returns_abnormally
6942 /* Don't warn for main(). */
6943 && !MAIN_NAME_P (DECL_NAME (fndecl))
6944 /* Or if they didn't actually specify a return type. */
6945 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6946 /* If we have -Wreturn-type, let flow complain. Unless we're an
6947 inline function, as we might never be compiled separately. */
6948 && (!warn_return_type || DECL_INLINE (fndecl)))
6949 warning ("no return statement in function returning non-void");
6951 /* Clear out memory we no longer need. */
6952 free_after_parsing (cfun);
6953 /* Since we never call rest_of_compilation, we never clear
6954 CFUN. Do so explicitly. */
6955 free_after_compilation (cfun);
6956 cfun = NULL;
6958 if (! nested)
6960 /* Generate RTL for the body of this function. */
6961 c_expand_body (fndecl, nested, 1);
6962 /* Let the error reporting routines know that we're outside a
6963 function. For a nested function, this value is used in
6964 pop_c_function_context and then reset via pop_function_context. */
6965 current_function_decl = NULL;
6969 /* Generate the RTL for a deferred function FNDECL. */
6971 void
6972 c_expand_deferred_function (fndecl)
6973 tree fndecl;
6975 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6976 function was deferred, e.g. in duplicate_decls. */
6977 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6979 c_expand_body (fndecl, 0, 0);
6980 current_function_decl = NULL;
6984 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6985 then we are already in the process of generating RTL for another
6986 function. If can_defer_p is zero, we won't attempt to defer the
6987 generation of RTL. */
6989 static void
6990 c_expand_body (fndecl, nested_p, can_defer_p)
6991 tree fndecl;
6992 int nested_p, can_defer_p;
6994 int uninlinable = 1;
6996 /* There's no reason to do any of the work here if we're only doing
6997 semantic analysis; this code just generates RTL. */
6998 if (flag_syntax_only)
6999 return;
7001 if (flag_inline_trees)
7003 /* First, cache whether the current function is inlinable. Some
7004 predicates depend on cfun and current_function_decl to
7005 function completely. */
7006 timevar_push (TV_INTEGRATION);
7007 uninlinable = ! tree_inlinable_function_p (fndecl);
7009 if (! uninlinable && can_defer_p
7010 /* Save function tree for inlining. Should return 0 if the
7011 language does not support function deferring or the
7012 function could not be deferred. */
7013 && defer_fn (fndecl))
7015 /* Let the back-end know that this function exists. */
7016 (*debug_hooks->deferred_inline_function) (fndecl);
7017 timevar_pop (TV_INTEGRATION);
7018 return;
7021 /* Then, inline any functions called in it. */
7022 optimize_inline_calls (fndecl);
7023 timevar_pop (TV_INTEGRATION);
7026 timevar_push (TV_EXPAND);
7028 if (nested_p)
7030 /* Make sure that we will evaluate variable-sized types involved
7031 in our function's type. */
7032 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
7033 /* Squirrel away our current state. */
7034 push_function_context ();
7037 /* Initialize the RTL code for the function. */
7038 current_function_decl = fndecl;
7039 input_filename = DECL_SOURCE_FILE (fndecl);
7040 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
7042 /* This function is being processed in whole-function mode. */
7043 cfun->x_whole_function_mode_p = 1;
7045 /* Even though we're inside a function body, we still don't want to
7046 call expand_expr to calculate the size of a variable-sized array.
7047 We haven't necessarily assigned RTL to all variables yet, so it's
7048 not safe to try to expand expressions involving them. */
7049 immediate_size_expand = 0;
7050 cfun->x_dont_save_pending_sizes_p = 1;
7052 /* If this is a varargs function, inform function.c. */
7053 if (c_function_varargs)
7054 mark_varargs ();
7056 /* Set up parameters and prepare for return, for the function. */
7057 expand_function_start (fndecl, 0);
7059 /* If this function is `main', emit a call to `__main'
7060 to run global initializers, etc. */
7061 if (DECL_NAME (fndecl)
7062 && MAIN_NAME_P (DECL_NAME (fndecl))
7063 && DECL_CONTEXT (fndecl) == NULL_TREE)
7064 expand_main_function ();
7066 /* Generate the RTL for this function. */
7067 expand_stmt (DECL_SAVED_TREE (fndecl));
7068 if (uninlinable)
7070 /* Allow the body of the function to be garbage collected. */
7071 DECL_SAVED_TREE (fndecl) = NULL_TREE;
7074 /* We hard-wired immediate_size_expand to zero above.
7075 expand_function_end will decrement this variable. So, we set the
7076 variable to one here, so that after the decrement it will remain
7077 zero. */
7078 immediate_size_expand = 1;
7080 /* Allow language dialects to perform special processing. */
7081 if (lang_expand_function_end)
7082 (*lang_expand_function_end) ();
7084 /* Generate rtl for function exit. */
7085 expand_function_end (input_filename, lineno, 0);
7087 /* If this is a nested function, protect the local variables in the stack
7088 above us from being collected while we're compiling this function. */
7089 if (nested_p)
7090 ggc_push_context ();
7092 /* Run the optimizers and output the assembler code for this function. */
7093 rest_of_compilation (fndecl);
7095 /* Undo the GC context switch. */
7096 if (nested_p)
7097 ggc_pop_context ();
7099 /* With just -W, complain only if function returns both with
7100 and without a value. */
7101 if (extra_warnings
7102 && current_function_returns_value
7103 && current_function_returns_null)
7104 warning ("this function may return with or without a value");
7106 /* If requested, warn about function definitions where the function will
7107 return a value (usually of some struct or union type) which itself will
7108 take up a lot of stack space. */
7110 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7112 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7114 if (ret_type && TYPE_SIZE_UNIT (ret_type)
7115 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
7116 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
7117 larger_than_size))
7119 unsigned int size_as_int
7120 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
7122 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
7123 warning_with_decl (fndecl,
7124 "size of return value of `%s' is %u bytes",
7125 size_as_int);
7126 else
7127 warning_with_decl (fndecl,
7128 "size of return value of `%s' is larger than %d bytes",
7129 larger_than_size);
7133 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
7134 && ! flag_inline_trees)
7136 /* Stop pointing to the local nodes about to be freed.
7137 But DECL_INITIAL must remain nonzero so we know this
7138 was an actual function definition.
7139 For a nested function, this is done in pop_c_function_context.
7140 If rest_of_compilation set this to 0, leave it 0. */
7141 if (DECL_INITIAL (fndecl) != 0)
7142 DECL_INITIAL (fndecl) = error_mark_node;
7144 DECL_ARGUMENTS (fndecl) = 0;
7147 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7149 if (targetm.have_ctors_dtors)
7150 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
7151 DEFAULT_INIT_PRIORITY);
7152 else
7153 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
7156 if (DECL_STATIC_DESTRUCTOR (fndecl))
7158 if (targetm.have_ctors_dtors)
7159 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
7160 DEFAULT_INIT_PRIORITY);
7161 else
7162 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
7165 if (nested_p)
7166 /* Return to the enclosing function. */
7167 pop_function_context ();
7168 timevar_pop (TV_EXPAND);
7171 /* Check the declarations given in a for-loop for satisfying the C99
7172 constraints. */
7173 void
7174 check_for_loop_decls ()
7176 tree t;
7178 if (!flag_isoc99)
7180 /* If we get here, declarations have been used in a for loop without
7181 the C99 for loop scope. This doesn't make much sense, so don't
7182 allow it. */
7183 error ("`for' loop initial declaration used outside C99 mode");
7184 return;
7186 /* C99 subclause 6.8.5 paragraph 3:
7188 [#3] The declaration part of a for statement shall only
7189 declare identifiers for objects having storage class auto or
7190 register.
7192 It isn't clear whether, in this sentence, "identifiers" binds to
7193 "shall only declare" or to "objects" - that is, whether all identifiers
7194 declared must be identifiers for objects, or whether the restriction
7195 only applies to those that are. (A question on this in comp.std.c
7196 in November 2000 received no answer.) We implement the strictest
7197 interpretation, to avoid creating an extension which later causes
7198 problems. */
7200 for (t = gettags (); t; t = TREE_CHAIN (t))
7202 if (TREE_PURPOSE (t) != 0)
7204 enum tree_code code = TREE_CODE (TREE_VALUE (t));
7206 if (code == RECORD_TYPE)
7207 error ("`struct %s' declared in `for' loop initial declaration",
7208 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7209 else if (code == UNION_TYPE)
7210 error ("`union %s' declared in `for' loop initial declaration",
7211 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7212 else
7213 error ("`enum %s' declared in `for' loop initial declaration",
7214 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7218 for (t = getdecls (); t; t = TREE_CHAIN (t))
7220 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7221 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7222 else if (TREE_STATIC (t))
7223 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7224 else if (DECL_EXTERNAL (t))
7225 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7229 /* Save and restore the variables in this file and elsewhere
7230 that keep track of the progress of compilation of the current function.
7231 Used for nested functions. */
7233 struct c_language_function
7235 struct language_function base;
7236 tree named_labels;
7237 tree shadowed_labels;
7238 int returns_value;
7239 int returns_null;
7240 int returns_abnormally;
7241 int warn_about_return_type;
7242 int extern_inline;
7243 struct binding_level *binding_level;
7246 /* Save and reinitialize the variables
7247 used during compilation of a C function. */
7249 void
7250 push_c_function_context (f)
7251 struct function *f;
7253 struct c_language_function *p;
7254 p = ((struct c_language_function *)
7255 xmalloc (sizeof (struct c_language_function)));
7256 f->language = (struct language_function *) p;
7258 p->base.x_stmt_tree = c_stmt_tree;
7259 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7260 p->named_labels = named_labels;
7261 p->shadowed_labels = shadowed_labels;
7262 p->returns_value = current_function_returns_value;
7263 p->returns_null = current_function_returns_null;
7264 p->returns_abnormally = current_function_returns_abnormally;
7265 p->warn_about_return_type = warn_about_return_type;
7266 p->extern_inline = current_extern_inline;
7267 p->binding_level = current_binding_level;
7270 /* Restore the variables used during compilation of a C function. */
7272 void
7273 pop_c_function_context (f)
7274 struct function *f;
7276 struct c_language_function *p
7277 = (struct c_language_function *) f->language;
7278 tree link;
7280 /* Bring back all the labels that were shadowed. */
7281 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7282 if (DECL_NAME (TREE_VALUE (link)) != 0)
7283 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7284 = TREE_VALUE (link);
7286 if (DECL_SAVED_INSNS (current_function_decl) == 0
7287 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7289 /* Stop pointing to the local nodes about to be freed. */
7290 /* But DECL_INITIAL must remain nonzero so we know this
7291 was an actual function definition. */
7292 DECL_INITIAL (current_function_decl) = error_mark_node;
7293 DECL_ARGUMENTS (current_function_decl) = 0;
7296 c_stmt_tree = p->base.x_stmt_tree;
7297 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7298 named_labels = p->named_labels;
7299 shadowed_labels = p->shadowed_labels;
7300 current_function_returns_value = p->returns_value;
7301 current_function_returns_null = p->returns_null;
7302 current_function_returns_abnormally = p->returns_abnormally;
7303 warn_about_return_type = p->warn_about_return_type;
7304 current_extern_inline = p->extern_inline;
7305 current_binding_level = p->binding_level;
7307 free (p);
7308 f->language = 0;
7311 /* Mark the language specific parts of F for GC. */
7313 void
7314 mark_c_function_context (f)
7315 struct function *f;
7317 struct c_language_function *p
7318 = (struct c_language_function *) f->language;
7320 if (p == 0)
7321 return;
7323 mark_c_language_function (&p->base);
7324 ggc_mark_tree (p->shadowed_labels);
7325 ggc_mark_tree (p->named_labels);
7326 mark_binding_level (&p->binding_level);
7329 /* Copy the DECL_LANG_SPECIFIC data associated with NODE. */
7331 void
7332 copy_lang_decl (decl)
7333 tree decl;
7335 struct lang_decl *ld;
7337 if (!DECL_LANG_SPECIFIC (decl))
7338 return;
7340 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7341 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7342 sizeof (struct lang_decl));
7343 DECL_LANG_SPECIFIC (decl) = ld;
7346 /* Mark the language specific bits in T for GC. */
7348 void
7349 lang_mark_tree (t)
7350 tree t;
7352 if (TREE_CODE (t) == IDENTIFIER_NODE)
7354 struct lang_identifier *i = (struct lang_identifier *) t;
7355 ggc_mark_tree (i->global_value);
7356 ggc_mark_tree (i->local_value);
7357 ggc_mark_tree (i->label_value);
7358 ggc_mark_tree (i->implicit_decl);
7359 ggc_mark_tree (i->error_locus);
7360 ggc_mark_tree (i->limbo_value);
7362 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7363 ggc_mark (TYPE_LANG_SPECIFIC (t));
7364 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7366 ggc_mark (DECL_LANG_SPECIFIC (t));
7367 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7368 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7372 /* The functions below are required for functionality of doing
7373 function at once processing in the C front end. Currently these
7374 functions are not called from anywhere in the C front end, but as
7375 these changes continue, that will change. */
7377 /* Returns non-zero if the current statement is a full expression,
7378 i.e. temporaries created during that statement should be destroyed
7379 at the end of the statement. */
7382 stmts_are_full_exprs_p ()
7384 return 0;
7387 /* Returns the stmt_tree (if any) to which statements are currently
7388 being added. If there is no active statement-tree, NULL is
7389 returned. */
7391 stmt_tree
7392 current_stmt_tree ()
7394 return &c_stmt_tree;
7397 /* Returns the stack of SCOPE_STMTs for the current function. */
7399 tree *
7400 current_scope_stmt_stack ()
7402 return &c_scope_stmt_stack;
7405 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7406 C. */
7409 anon_aggr_type_p (node)
7410 tree node ATTRIBUTE_UNUSED;
7412 return 0;
7415 /* Dummy function in place of callback used by C++. */
7417 void
7418 extract_interface_info ()
7422 /* Return a new COMPOUND_STMT, after adding it to the current
7423 statement tree. */
7425 tree
7426 c_begin_compound_stmt ()
7428 tree stmt;
7430 /* Create the COMPOUND_STMT. */
7431 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7433 return stmt;
7436 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7437 common code. */
7439 void
7440 c_expand_decl_stmt (t)
7441 tree t;
7443 tree decl = DECL_STMT_DECL (t);
7445 /* Expand nested functions. */
7446 if (TREE_CODE (decl) == FUNCTION_DECL
7447 && DECL_CONTEXT (decl) == current_function_decl
7448 && DECL_SAVED_TREE (decl))
7449 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7452 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7453 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7455 tree
7456 identifier_global_value (t)
7457 tree t;
7459 return IDENTIFIER_GLOBAL_VALUE (t);
7462 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7463 otherwise the name is found in ridpointers from RID_INDEX. */
7465 void
7466 record_builtin_type (rid_index, name, type)
7467 enum rid rid_index;
7468 const char *name;
7469 tree type;
7471 tree id;
7472 if (name == 0)
7473 id = ridpointers[(int) rid_index];
7474 else
7475 id = get_identifier (name);
7476 pushdecl (build_decl (TYPE_DECL, id, type));
7479 /* Build the void_list_node (void_type_node having been created). */
7480 tree
7481 build_void_list_node ()
7483 tree t = build_tree_list (NULL_TREE, void_type_node);
7484 return t;