1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
40 extern cpp_reader parse_in;
41 extern cpp_options parse_options;
42 static int cpp_initialized;
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
54 #ifndef CHAR_TYPE_SIZE
55 #define CHAR_TYPE_SIZE BITS_PER_UNIT
58 #ifndef SHORT_TYPE_SIZE
59 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
63 #define INT_TYPE_SIZE BITS_PER_WORD
66 #ifndef LONG_TYPE_SIZE
67 #define LONG_TYPE_SIZE BITS_PER_WORD
70 #ifndef LONG_LONG_TYPE_SIZE
71 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
74 #ifndef WCHAR_UNSIGNED
75 #define WCHAR_UNSIGNED 0
78 #ifndef FLOAT_TYPE_SIZE
79 #define FLOAT_TYPE_SIZE BITS_PER_WORD
82 #ifndef DOUBLE_TYPE_SIZE
83 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
86 #ifndef LONG_DOUBLE_TYPE_SIZE
87 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
90 /* We let tm.h override the types used here, to handle trivial differences
91 such as the choice of unsigned int or long unsigned int for size_t.
92 When machines start needing nontrivial differences in the size type,
93 it would be best to do something here to figure out automatically
94 from other information what type to use. */
97 #define SIZE_TYPE "long unsigned int"
101 #define PTRDIFF_TYPE "long int"
105 #define WCHAR_TYPE "int"
108 /* a node which has tree code ERROR_MARK, and whose type is itself.
109 All erroneous expressions are replaced with this node. All functions
110 that accept nodes as arguments should avoid generating error messages
111 if this node is one of the arguments, since it is undesirable to get
112 multiple error messages from one error in the input. */
114 tree error_mark_node;
116 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
118 tree short_integer_type_node;
119 tree integer_type_node;
120 tree long_integer_type_node;
121 tree long_long_integer_type_node;
123 tree short_unsigned_type_node;
124 tree unsigned_type_node;
125 tree long_unsigned_type_node;
126 tree long_long_unsigned_type_node;
128 tree boolean_type_node;
129 tree boolean_false_node;
130 tree boolean_true_node;
132 tree ptrdiff_type_node;
134 tree unsigned_char_type_node;
135 tree signed_char_type_node;
137 tree wchar_type_node;
138 tree signed_wchar_type_node;
139 tree unsigned_wchar_type_node;
141 tree float_type_node;
142 tree double_type_node;
143 tree long_double_type_node;
145 tree complex_integer_type_node;
146 tree complex_float_type_node;
147 tree complex_double_type_node;
148 tree complex_long_double_type_node;
150 tree intQI_type_node;
151 tree intHI_type_node;
152 tree intSI_type_node;
153 tree intDI_type_node;
154 tree intTI_type_node;
156 tree unsigned_intQI_type_node;
157 tree unsigned_intHI_type_node;
158 tree unsigned_intSI_type_node;
159 tree unsigned_intDI_type_node;
160 tree unsigned_intTI_type_node;
162 /* a VOID_TYPE node. */
166 /* Nodes for types `void *' and `const void *'. */
168 tree ptr_type_node, const_ptr_type_node;
170 /* Nodes for types `char *' and `const char *'. */
172 tree string_type_node, const_string_type_node;
174 /* Type `char[SOMENUMBER]'.
175 Used when an array of char is needed and the size is irrelevant. */
177 tree char_array_type_node;
179 /* Type `int[SOMENUMBER]' or something like it.
180 Used when an array of int needed and the size is irrelevant. */
182 tree int_array_type_node;
184 /* Type `wchar_t[SOMENUMBER]' or something like it.
185 Used when a wide string literal is created. */
187 tree wchar_array_type_node;
189 /* type `int ()' -- used for implicit declaration of functions. */
191 tree default_function_type;
193 /* function types `double (double)' and `double (double, double)', etc. */
195 tree double_ftype_double, double_ftype_double_double;
196 tree int_ftype_int, long_ftype_long;
197 tree float_ftype_float;
198 tree ldouble_ftype_ldouble;
200 /* Function type `void (void *, void *, int)' and similar ones */
202 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
204 /* Function type `char *(char *, char *)' and similar ones */
205 tree string_ftype_ptr_ptr, int_ftype_string_string;
207 /* Function type `int (const void *, const void *, size_t)' */
208 tree int_ftype_cptr_cptr_sizet;
210 /* Two expressions that are constants with value zero.
211 The first is of type `int', the second of type `void *'. */
213 tree integer_zero_node;
214 tree null_pointer_node;
216 /* A node for the integer constant 1. */
218 tree integer_one_node;
220 /* Nonzero if we have seen an invalid cross reference
221 to a struct, union, or enum, but not yet printed the message. */
223 tree pending_invalid_xref;
224 /* File and line to appear in the eventual error message. */
225 char *pending_invalid_xref_file;
226 int pending_invalid_xref_line;
228 /* While defining an enum type, this is 1 plus the last enumerator
229 constant value. Note that will do not have to save this or `enum_overflow'
230 around nested function definition since such a definition could only
231 occur in an enum value expression and we don't use these variables in
234 static tree enum_next_value;
236 /* Nonzero means that there was overflow computing enum_next_value. */
238 static int enum_overflow;
240 /* Parsing a function declarator leaves a list of parameter names
241 or a chain or parameter decls here. */
243 static tree last_function_parms;
245 /* Parsing a function declarator leaves here a chain of structure
246 and enum types declared in the parmlist. */
248 static tree last_function_parm_tags;
250 /* After parsing the declarator that starts a function definition,
251 `start_function' puts here the list of parameter names or chain of decls.
252 `store_parm_decls' finds it here. */
254 static tree current_function_parms;
256 /* Similar, for last_function_parm_tags. */
257 static tree current_function_parm_tags;
259 /* Similar, for the file and line that the prototype came from if this is
260 an old-style definition. */
261 static char *current_function_prototype_file;
262 static int current_function_prototype_line;
264 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
265 that have names. Here so we can clear out their names' definitions
266 at the end of the function. */
268 static tree named_labels;
270 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
272 static tree shadowed_labels;
274 /* Nonzero when store_parm_decls is called indicates a varargs function.
275 Value not meaningful after store_parm_decls. */
277 static int c_function_varargs;
279 /* The FUNCTION_DECL for the function currently being compiled,
280 or 0 if between functions. */
281 tree current_function_decl;
283 /* Set to 0 at beginning of a function definition, set to 1 if
284 a return statement that specifies a return value is seen. */
286 int current_function_returns_value;
288 /* Set to 0 at beginning of a function definition, set to 1 if
289 a return statement with no argument is seen. */
291 int current_function_returns_null;
293 /* Set to nonzero by `grokdeclarator' for a function
294 whose return type is defaulted, if warnings for this are desired. */
296 static int warn_about_return_type;
298 /* Nonzero when starting a function declared `extern inline'. */
300 static int current_extern_inline;
302 /* For each binding contour we allocate a binding_level structure
303 * which records the names defined in that contour.
306 * 1) one for each function definition,
307 * where internal declarations of the parameters appear.
308 * 2) one for each compound statement,
309 * to record its declarations.
311 * The current meaning of a name can be found by searching the levels from
312 * the current one out to the global one.
315 /* Note that the information in the `names' component of the global contour
316 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
320 /* A chain of _DECL nodes for all variables, constants, functions,
321 and typedef types. These are in the reverse of the order supplied.
325 /* A list of structure, union and enum definitions,
326 * for looking up tag names.
327 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
328 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
329 * or ENUMERAL_TYPE node.
333 /* For each level, a list of shadowed outer-level local definitions
334 to be restored when this level is popped.
335 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
336 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
339 /* For each level (except not the global one),
340 a chain of BLOCK nodes for all the levels
341 that were entered and exited one level down. */
344 /* The BLOCK node for this level, if one has been preallocated.
345 If 0, the BLOCK is allocated (if needed) when the level is popped. */
348 /* The binding level which this one is contained in (inherits from). */
349 struct binding_level *level_chain;
351 /* Nonzero for the level that holds the parameters of a function. */
354 /* Nonzero if this level "doesn't exist" for tags. */
355 char tag_transparent;
357 /* Nonzero if sublevels of this level "don't exist" for tags.
358 This is set in the parm level of a function definition
359 while reading the function body, so that the outermost block
360 of the function body will be tag-transparent. */
361 char subblocks_tag_transparent;
363 /* Nonzero means make a BLOCK for this level regardless of all else. */
366 /* Nonzero means make a BLOCK if this level has any subblocks. */
367 char keep_if_subblocks;
369 /* Number of decls in `names' that have incomplete
370 structure or union types. */
373 /* A list of decls giving the (reversed) specified order of parms,
374 not including any forward-decls in the parmlist.
375 This is so we can put the parms in proper order for assign_parms. */
379 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
381 /* The binding level currently in effect. */
383 static struct binding_level *current_binding_level;
385 /* A chain of binding_level structures awaiting reuse. */
387 static struct binding_level *free_binding_level;
389 /* The outermost binding level, for names of file scope.
390 This is created when the compiler is started and exists
391 through the entire run. */
393 static struct binding_level *global_binding_level;
395 /* Binding level structures are initialized by copying this one. */
397 static struct binding_level clear_binding_level
398 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
401 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
403 static int keep_next_level_flag;
405 /* Nonzero means make a BLOCK for the next level pushed
406 if it has subblocks. */
408 static int keep_next_if_subblocks;
410 /* The chain of outer levels of label scopes.
411 This uses the same data structure used for binding levels,
412 but it works differently: each link in the chain records
413 saved values of named_labels and shadowed_labels for
414 a label binding level outside the current one. */
416 static struct binding_level *label_level_chain;
418 /* Functions called automatically at the beginning and end of execution. */
420 tree static_ctors, static_dtors;
422 /* Forward declarations. */
424 static struct binding_level * make_binding_level PROTO((void));
425 static void clear_limbo_values PROTO((tree));
426 static int duplicate_decls PROTO((tree, tree, int));
427 static char *redeclaration_error_message PROTO((tree, tree));
428 static void storedecls PROTO((tree));
429 static void storetags PROTO((tree));
430 static tree lookup_tag PROTO((enum tree_code, tree,
431 struct binding_level *, int));
432 static tree lookup_tag_reverse PROTO((tree));
433 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
435 static tree grokparms PROTO((tree, int));
436 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
437 static void layout_array_type PROTO((tree));
439 /* C-specific option variables. */
441 /* Nonzero means allow type mismatches in conditional expressions;
442 just make their values `void'. */
444 int flag_cond_mismatch;
446 /* Nonzero means give `double' the same size as `float'. */
448 int flag_short_double;
450 /* Nonzero means don't recognize the keyword `asm'. */
454 /* Nonzero means don't recognize any builtin functions. */
458 /* Nonzero means don't recognize the non-ANSI builtin functions.
461 int flag_no_nonansi_builtin;
463 /* Nonzero means do some things the same way PCC does. */
465 int flag_traditional;
467 /* Nonzero means that we have builtin functions, and main is an int */
471 /* Nonzero means to allow single precision math even if we're generally
472 being traditional. */
473 int flag_allow_single_precision = 0;
475 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
477 int flag_signed_bitfields = 1;
478 int explicit_flag_signed_bitfields = 0;
480 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
482 int flag_no_ident = 0;
484 /* Nonzero means warn about use of implicit int. */
486 int warn_implicit_int;
488 /* Nonzero means message about use of implicit function declarations;
489 1 means warning; 2 means error. */
491 int mesg_implicit_function_declaration;
493 /* Nonzero means give string constants the type `const char *'
494 to get extra warnings from them. These warnings will be too numerous
495 to be useful, except in thoroughly ANSIfied programs. */
497 int warn_write_strings;
499 /* Nonzero means warn about pointer casts that can drop a type qualifier
500 from the pointer target type. */
504 /* Nonzero means warn when casting a function call to a type that does
505 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
506 when there is no previous declaration of sqrt or malloc. */
508 int warn_bad_function_cast;
510 /* Warn about traditional constructs whose meanings changed in ANSI C. */
512 int warn_traditional;
514 /* Nonzero means warn about sizeof(function) or addition/subtraction
515 of function pointers. */
517 int warn_pointer_arith;
519 /* Nonzero means warn for non-prototype function decls
520 or non-prototyped defs without previous prototype. */
522 int warn_strict_prototypes;
524 /* Nonzero means warn for any global function def
525 without separate previous prototype decl. */
527 int warn_missing_prototypes;
529 /* Nonzero means warn for any global function def
530 without separate previous decl. */
532 int warn_missing_declarations;
534 /* Nonzero means warn about multiple (redundant) decls for the same single
535 variable or function. */
537 int warn_redundant_decls = 0;
539 /* Nonzero means warn about extern declarations of objects not at
540 file-scope level and about *all* declarations of functions (whether
541 extern or static) not at file-scope level. Note that we exclude
542 implicit function declarations. To get warnings about those, use
545 int warn_nested_externs = 0;
547 /* Warn about *printf or *scanf format/argument anomalies. */
551 /* Warn about a subscript that has type char. */
553 int warn_char_subscripts = 0;
555 /* Warn if a type conversion is done that might have confusing results. */
559 /* Warn if adding () is suggested. */
561 int warn_parentheses;
563 /* Warn if initializer is not completely bracketed. */
565 int warn_missing_braces;
567 /* Warn if main is suspicious. */
571 /* Warn about #pragma directives that are not recognised. */
573 int warn_unknown_pragmas = 0; /* Tri state variable. */
575 /* Warn about comparison of signed and unsigned values.
576 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
578 int warn_sign_compare = -1;
580 /* Nonzero means `$' can be in an identifier. */
582 #ifndef DOLLARS_IN_IDENTIFIERS
583 #define DOLLARS_IN_IDENTIFIERS 1
585 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
587 /* Decode the string P as a language-specific option for C.
588 Return the number of strings consumed. */
591 c_decode_option (argc, argv)
595 int strings_processed;
598 if (! cpp_initialized)
600 cpp_reader_init (&parse_in);
601 parse_in.data = &parse_options;
602 cpp_options_init (&parse_options);
605 strings_processed = cpp_handle_option (&parse_in, argc, argv);
607 strings_processed = 0;
608 #endif /* ! USE_CPPLIB */
610 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
612 flag_traditional = 1;
613 flag_writable_strings = 1;
615 else if (!strcmp (p, "-fallow-single-precision"))
616 flag_allow_single_precision = 1;
617 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
622 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
626 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
630 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
632 flag_traditional = 0;
633 flag_writable_strings = 0;
635 else if (!strcmp (p, "-fdollars-in-identifiers"))
636 dollars_in_ident = 1;
637 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
638 dollars_in_ident = 0;
639 else if (!strcmp (p, "-fsigned-char"))
640 flag_signed_char = 1;
641 else if (!strcmp (p, "-funsigned-char"))
642 flag_signed_char = 0;
643 else if (!strcmp (p, "-fno-signed-char"))
644 flag_signed_char = 0;
645 else if (!strcmp (p, "-fno-unsigned-char"))
646 flag_signed_char = 1;
647 else if (!strcmp (p, "-fsigned-bitfields")
648 || !strcmp (p, "-fno-unsigned-bitfields"))
650 flag_signed_bitfields = 1;
651 explicit_flag_signed_bitfields = 1;
653 else if (!strcmp (p, "-funsigned-bitfields")
654 || !strcmp (p, "-fno-signed-bitfields"))
656 flag_signed_bitfields = 0;
657 explicit_flag_signed_bitfields = 1;
659 else if (!strcmp (p, "-fshort-enums"))
660 flag_short_enums = 1;
661 else if (!strcmp (p, "-fno-short-enums"))
662 flag_short_enums = 0;
663 else if (!strcmp (p, "-fcond-mismatch"))
664 flag_cond_mismatch = 1;
665 else if (!strcmp (p, "-fno-cond-mismatch"))
666 flag_cond_mismatch = 0;
667 else if (!strcmp (p, "-fshort-double"))
668 flag_short_double = 1;
669 else if (!strcmp (p, "-fno-short-double"))
670 flag_short_double = 0;
671 else if (!strcmp (p, "-fasm"))
673 else if (!strcmp (p, "-fno-asm"))
675 else if (!strcmp (p, "-fbuiltin"))
677 else if (!strcmp (p, "-fno-builtin"))
679 else if (!strcmp (p, "-fno-ident"))
681 else if (!strcmp (p, "-fident"))
683 else if (!strcmp (p, "-ansi"))
684 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
685 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
686 mesg_implicit_function_declaration = 2;
687 else if (!strcmp (p, "-Wimplicit-function-declaration"))
688 mesg_implicit_function_declaration = 1;
689 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
690 mesg_implicit_function_declaration = 0;
691 else if (!strcmp (p, "-Wimplicit-int"))
692 warn_implicit_int = 1;
693 else if (!strcmp (p, "-Wno-implicit-int"))
694 warn_implicit_int = 0;
695 else if (!strcmp (p, "-Wimplicit"))
697 warn_implicit_int = 1;
698 if (mesg_implicit_function_declaration != 2)
699 mesg_implicit_function_declaration = 1;
701 else if (!strcmp (p, "-Wno-implicit"))
702 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
703 else if (!strcmp (p, "-Wwrite-strings"))
704 warn_write_strings = 1;
705 else if (!strcmp (p, "-Wno-write-strings"))
706 warn_write_strings = 0;
707 else if (!strcmp (p, "-Wcast-qual"))
709 else if (!strcmp (p, "-Wno-cast-qual"))
711 else if (!strcmp (p, "-Wbad-function-cast"))
712 warn_bad_function_cast = 1;
713 else if (!strcmp (p, "-Wno-bad-function-cast"))
714 warn_bad_function_cast = 0;
715 else if (!strcmp (p, "-Wpointer-arith"))
716 warn_pointer_arith = 1;
717 else if (!strcmp (p, "-Wno-pointer-arith"))
718 warn_pointer_arith = 0;
719 else if (!strcmp (p, "-Wstrict-prototypes"))
720 warn_strict_prototypes = 1;
721 else if (!strcmp (p, "-Wno-strict-prototypes"))
722 warn_strict_prototypes = 0;
723 else if (!strcmp (p, "-Wmissing-prototypes"))
724 warn_missing_prototypes = 1;
725 else if (!strcmp (p, "-Wno-missing-prototypes"))
726 warn_missing_prototypes = 0;
727 else if (!strcmp (p, "-Wmissing-declarations"))
728 warn_missing_declarations = 1;
729 else if (!strcmp (p, "-Wno-missing-declarations"))
730 warn_missing_declarations = 0;
731 else if (!strcmp (p, "-Wredundant-decls"))
732 warn_redundant_decls = 1;
733 else if (!strcmp (p, "-Wno-redundant-decls"))
734 warn_redundant_decls = 0;
735 else if (!strcmp (p, "-Wnested-externs"))
736 warn_nested_externs = 1;
737 else if (!strcmp (p, "-Wno-nested-externs"))
738 warn_nested_externs = 0;
739 else if (!strcmp (p, "-Wtraditional"))
740 warn_traditional = 1;
741 else if (!strcmp (p, "-Wno-traditional"))
742 warn_traditional = 0;
743 else if (!strcmp (p, "-Wformat"))
745 else if (!strcmp (p, "-Wno-format"))
747 else if (!strcmp (p, "-Wchar-subscripts"))
748 warn_char_subscripts = 1;
749 else if (!strcmp (p, "-Wno-char-subscripts"))
750 warn_char_subscripts = 0;
751 else if (!strcmp (p, "-Wconversion"))
753 else if (!strcmp (p, "-Wno-conversion"))
755 else if (!strcmp (p, "-Wparentheses"))
756 warn_parentheses = 1;
757 else if (!strcmp (p, "-Wno-parentheses"))
758 warn_parentheses = 0;
759 else if (!strcmp (p, "-Wreturn-type"))
760 warn_return_type = 1;
761 else if (!strcmp (p, "-Wno-return-type"))
762 warn_return_type = 0;
763 else if (!strcmp (p, "-Wcomment"))
764 ; /* cpp handles this one. */
765 else if (!strcmp (p, "-Wno-comment"))
766 ; /* cpp handles this one. */
767 else if (!strcmp (p, "-Wcomments"))
768 ; /* cpp handles this one. */
769 else if (!strcmp (p, "-Wno-comments"))
770 ; /* cpp handles this one. */
771 else if (!strcmp (p, "-Wtrigraphs"))
772 ; /* cpp handles this one. */
773 else if (!strcmp (p, "-Wno-trigraphs"))
774 ; /* cpp handles this one. */
775 else if (!strcmp (p, "-Wundef"))
776 ; /* cpp handles this one. */
777 else if (!strcmp (p, "-Wno-undef"))
778 ; /* cpp handles this one. */
779 else if (!strcmp (p, "-Wimport"))
780 ; /* cpp handles this one. */
781 else if (!strcmp (p, "-Wno-import"))
782 ; /* cpp handles this one. */
783 else if (!strcmp (p, "-Wmissing-braces"))
784 warn_missing_braces = 1;
785 else if (!strcmp (p, "-Wno-missing-braces"))
786 warn_missing_braces = 0;
787 else if (!strcmp (p, "-Wmain"))
789 else if (!strcmp (p, "-Wno-main"))
791 else if (!strcmp (p, "-Wsign-compare"))
792 warn_sign_compare = 1;
793 else if (!strcmp (p, "-Wno-sign-compare"))
794 warn_sign_compare = 0;
795 else if (!strcmp (p, "-Wunknown-pragmas"))
796 /* Set to greater than 1, so that even unknown pragmas in system
797 headers will be warned about. */
798 warn_unknown_pragmas = 2;
799 else if (!strcmp (p, "-Wno-unknown-pragmas"))
800 warn_unknown_pragmas = 0;
801 else if (!strcmp (p, "-Wall"))
803 /* We save the value of warn_uninitialized, since if they put
804 -Wuninitialized on the command line, we need to generate a
805 warning about not using it without also specifying -O. */
806 if (warn_uninitialized != 1)
807 warn_uninitialized = 2;
808 warn_implicit_int = 1;
809 mesg_implicit_function_declaration = 1;
810 warn_return_type = 1;
814 warn_char_subscripts = 1;
815 warn_parentheses = 1;
816 warn_missing_braces = 1;
817 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
818 it off only if it's not explicit. */
820 /* Only warn about unknown pragmas that are not in system headers. */
821 warn_unknown_pragmas = 1;
824 return strings_processed;
829 /* Hooks for print_node. */
832 print_lang_decl (file, node, indent)
833 FILE *file ATTRIBUTE_UNUSED;
834 tree node ATTRIBUTE_UNUSED;
835 int indent ATTRIBUTE_UNUSED;
840 print_lang_type (file, node, indent)
841 FILE *file ATTRIBUTE_UNUSED;
842 tree node ATTRIBUTE_UNUSED;
843 int indent ATTRIBUTE_UNUSED;
848 print_lang_identifier (file, node, indent)
853 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
854 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
855 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
856 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
857 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
858 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
861 /* Hook called at end of compilation to assume 1 elt
862 for a top-level array decl that wasn't complete before. */
865 finish_incomplete_decl (decl)
868 if (TREE_CODE (decl) == VAR_DECL)
870 tree type = TREE_TYPE (decl);
871 if (type != error_mark_node
872 && TREE_CODE (type) == ARRAY_TYPE
873 && TYPE_DOMAIN (type) == 0)
875 if (! DECL_EXTERNAL (decl))
876 warning_with_decl (decl, "array `%s' assumed to have one element");
878 complete_array_type (type, NULL_TREE, 1);
880 layout_decl (decl, 0);
885 /* Create a new `struct binding_level'. */
888 struct binding_level *
889 make_binding_level ()
892 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
895 /* Nonzero if we are currently in the global binding level. */
900 return current_binding_level == global_binding_level;
906 keep_next_level_flag = 1;
909 /* Nonzero if the current level needs to have a BLOCK made. */
914 return ((current_binding_level->keep_if_subblocks
915 && current_binding_level->blocks != 0)
916 || current_binding_level->keep
917 || current_binding_level->names != 0
918 || (current_binding_level->tags != 0
919 && !current_binding_level->tag_transparent));
922 /* Identify this binding level as a level of parameters.
923 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
924 But it turns out there is no way to pass the right value for
925 DEFINITION_FLAG, so we ignore it. */
928 declare_parm_level (definition_flag)
931 current_binding_level->parm_flag = 1;
934 /* Nonzero if currently making parm declarations. */
939 return current_binding_level->parm_flag;
942 /* Enter a new binding level.
943 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
944 not for that of tags. */
947 pushlevel (tag_transparent)
950 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
952 /* If this is the top level of a function,
953 just make sure that NAMED_LABELS is 0. */
955 if (current_binding_level == global_binding_level)
960 /* Reuse or create a struct for this binding level. */
962 if (free_binding_level)
964 newlevel = free_binding_level;
965 free_binding_level = free_binding_level->level_chain;
969 newlevel = make_binding_level ();
972 /* Add this level to the front of the chain (stack) of levels that
975 *newlevel = clear_binding_level;
976 newlevel->tag_transparent
978 || (current_binding_level
979 ? current_binding_level->subblocks_tag_transparent
981 newlevel->level_chain = current_binding_level;
982 current_binding_level = newlevel;
983 newlevel->keep = keep_next_level_flag;
984 keep_next_level_flag = 0;
985 newlevel->keep_if_subblocks = keep_next_if_subblocks;
986 keep_next_if_subblocks = 0;
989 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
992 clear_limbo_values (block)
997 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
998 if (DECL_NAME (tem) != 0)
999 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1001 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1002 clear_limbo_values (tem);
1005 /* Exit a binding level.
1006 Pop the level off, and restore the state of the identifier-decl mappings
1007 that were in effect when this level was entered.
1009 If KEEP is nonzero, this level had explicit declarations, so
1010 and create a "block" (a BLOCK node) for the level
1011 to record its declarations and subblocks for symbol table output.
1013 If FUNCTIONBODY is nonzero, this level is the body of a function,
1014 so create a block as if KEEP were set and also clear out all
1017 If REVERSE is nonzero, reverse the order of decls before putting
1018 them into the BLOCK. */
1021 poplevel (keep, reverse, functionbody)
1027 /* The chain of decls was accumulated in reverse order.
1028 Put it into forward order, just for cleanliness. */
1030 tree tags = current_binding_level->tags;
1031 tree subblocks = current_binding_level->blocks;
1034 int block_previously_created;
1036 keep |= current_binding_level->keep;
1038 /* This warning is turned off because it causes warnings for
1039 declarations like `extern struct foo *x'. */
1041 /* Warn about incomplete structure types in this level. */
1042 for (link = tags; link; link = TREE_CHAIN (link))
1043 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1045 tree type = TREE_VALUE (link);
1047 switch (TREE_CODE (type))
1050 errmsg = "`struct %s' incomplete in scope ending here";
1053 errmsg = "`union %s' incomplete in scope ending here";
1056 errmsg = "`enum %s' incomplete in scope ending here";
1059 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1060 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1062 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1063 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1067 /* Get the decls in the order they were written.
1068 Usually current_binding_level->names is in reverse order.
1069 But parameter decls were previously put in forward order. */
1072 current_binding_level->names
1073 = decls = nreverse (current_binding_level->names);
1075 decls = current_binding_level->names;
1077 /* Output any nested inline functions within this block
1078 if they weren't already output. */
1080 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1081 if (TREE_CODE (decl) == FUNCTION_DECL
1082 && ! TREE_ASM_WRITTEN (decl)
1083 && DECL_INITIAL (decl) != 0
1084 && TREE_ADDRESSABLE (decl))
1086 /* If this decl was copied from a file-scope decl
1087 on account of a block-scope extern decl,
1088 propagate TREE_ADDRESSABLE to the file-scope decl.
1090 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1091 true, since then the decl goes through save_for_inline_copying. */
1092 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1093 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1094 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1095 else if (DECL_SAVED_INSNS (decl) != 0)
1097 push_function_context ();
1098 output_inline_function (decl);
1099 pop_function_context ();
1103 /* If there were any declarations or structure tags in that level,
1104 or if this level is a function body,
1105 create a BLOCK to record them for the life of this function. */
1108 block_previously_created = (current_binding_level->this_block != 0);
1109 if (block_previously_created)
1110 block = current_binding_level->this_block;
1111 else if (keep || functionbody
1112 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1113 block = make_node (BLOCK);
1116 BLOCK_VARS (block) = decls;
1117 BLOCK_TYPE_TAGS (block) = tags;
1118 BLOCK_SUBBLOCKS (block) = subblocks;
1119 remember_end_note (block);
1122 /* In each subblock, record that this is its superior. */
1124 for (link = subblocks; link; link = TREE_CHAIN (link))
1125 BLOCK_SUPERCONTEXT (link) = block;
1127 /* Clear out the meanings of the local variables of this level. */
1129 for (link = decls; link; link = TREE_CHAIN (link))
1131 if (DECL_NAME (link) != 0)
1133 /* If the ident. was used or addressed via a local extern decl,
1134 don't forget that fact. */
1135 if (DECL_EXTERNAL (link))
1137 if (TREE_USED (link))
1138 TREE_USED (DECL_NAME (link)) = 1;
1139 if (TREE_ADDRESSABLE (link))
1140 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1142 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1146 /* Restore all name-meanings of the outer levels
1147 that were shadowed by this level. */
1149 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1150 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1152 /* If the level being exited is the top level of a function,
1153 check over all the labels, and clear out the current
1154 (function local) meanings of their names. */
1158 clear_limbo_values (block);
1160 /* If this is the top level block of a function,
1161 the vars are the function's parameters.
1162 Don't leave them in the BLOCK because they are
1163 found in the FUNCTION_DECL instead. */
1165 BLOCK_VARS (block) = 0;
1167 /* Clear out the definitions of all label names,
1168 since their scopes end here,
1169 and add them to BLOCK_VARS. */
1171 for (link = named_labels; link; link = TREE_CHAIN (link))
1173 register tree label = TREE_VALUE (link);
1175 if (DECL_INITIAL (label) == 0)
1177 error_with_decl (label, "label `%s' used but not defined");
1178 /* Avoid crashing later. */
1179 define_label (input_filename, lineno,
1182 else if (warn_unused && !TREE_USED (label))
1183 warning_with_decl (label, "label `%s' defined but not used");
1184 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1186 /* Put the labels into the "variables" of the
1187 top-level block, so debugger can see them. */
1188 TREE_CHAIN (label) = BLOCK_VARS (block);
1189 BLOCK_VARS (block) = label;
1193 /* Pop the current level, and free the structure for reuse. */
1196 register struct binding_level *level = current_binding_level;
1197 current_binding_level = current_binding_level->level_chain;
1199 level->level_chain = free_binding_level;
1200 free_binding_level = level;
1203 /* Dispose of the block that we just made inside some higher level. */
1205 DECL_INITIAL (current_function_decl) = block;
1208 if (!block_previously_created)
1209 current_binding_level->blocks
1210 = chainon (current_binding_level->blocks, block);
1212 /* If we did not make a block for the level just exited,
1213 any blocks made for inner levels
1214 (since they cannot be recorded as subblocks in that level)
1215 must be carried forward so they will later become subblocks
1216 of something else. */
1218 current_binding_level->blocks
1219 = chainon (current_binding_level->blocks, subblocks);
1221 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1222 binding contour so that they point to the appropriate construct, i.e.
1223 either to the current FUNCTION_DECL node, or else to the BLOCK node
1224 we just constructed.
1226 Note that for tagged types whose scope is just the formal parameter
1227 list for some function type specification, we can't properly set
1228 their TYPE_CONTEXTs here, because we don't have a pointer to the
1229 appropriate FUNCTION_TYPE node readily available to us. For those
1230 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1231 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1232 node which will represent the "scope" for these "parameter list local"
1237 for (link = tags; link; link = TREE_CHAIN (link))
1238 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1240 for (link = tags; link; link = TREE_CHAIN (link))
1241 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1244 TREE_USED (block) = 1;
1248 /* Delete the node BLOCK from the current binding level.
1249 This is used for the block inside a stmt expr ({...})
1250 so that the block can be reinserted where appropriate. */
1253 delete_block (block)
1257 if (current_binding_level->blocks == block)
1258 current_binding_level->blocks = TREE_CHAIN (block);
1259 for (t = current_binding_level->blocks; t;)
1261 if (TREE_CHAIN (t) == block)
1262 TREE_CHAIN (t) = TREE_CHAIN (block);
1266 TREE_CHAIN (block) = NULL;
1267 /* Clear TREE_USED which is always set by poplevel.
1268 The flag is set again if insert_block is called. */
1269 TREE_USED (block) = 0;
1272 /* Insert BLOCK at the end of the list of subblocks of the
1273 current binding level. This is used when a BIND_EXPR is expanded,
1274 to handle the BLOCK node inside the BIND_EXPR. */
1277 insert_block (block)
1280 TREE_USED (block) = 1;
1281 current_binding_level->blocks
1282 = chainon (current_binding_level->blocks, block);
1285 /* Set the BLOCK node for the innermost scope
1286 (the one we are currently in). */
1290 register tree block;
1292 current_binding_level->this_block = block;
1298 register struct binding_level *newlevel;
1300 /* Reuse or create a struct for this binding level. */
1302 if (free_binding_level)
1304 newlevel = free_binding_level;
1305 free_binding_level = free_binding_level->level_chain;
1309 newlevel = make_binding_level ();
1312 /* Add this level to the front of the chain (stack) of label levels. */
1314 newlevel->level_chain = label_level_chain;
1315 label_level_chain = newlevel;
1317 newlevel->names = named_labels;
1318 newlevel->shadowed = shadowed_labels;
1320 shadowed_labels = 0;
1326 register struct binding_level *level = label_level_chain;
1329 /* Clear out the definitions of the declared labels in this level.
1330 Leave in the list any ordinary, non-declared labels. */
1331 for (link = named_labels, prev = 0; link;)
1333 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1335 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1337 error_with_decl (TREE_VALUE (link),
1338 "label `%s' used but not defined");
1339 /* Avoid crashing later. */
1340 define_label (input_filename, lineno,
1341 DECL_NAME (TREE_VALUE (link)));
1343 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1344 warning_with_decl (TREE_VALUE (link),
1345 "label `%s' defined but not used");
1346 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1348 /* Delete this element from the list. */
1349 link = TREE_CHAIN (link);
1351 TREE_CHAIN (prev) = link;
1353 named_labels = link;
1358 link = TREE_CHAIN (link);
1362 /* Bring back all the labels that were shadowed. */
1363 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1364 if (DECL_NAME (TREE_VALUE (link)) != 0)
1365 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1366 = TREE_VALUE (link);
1368 named_labels = chainon (named_labels, level->names);
1369 shadowed_labels = level->shadowed;
1371 /* Pop the current level, and free the structure for reuse. */
1372 label_level_chain = label_level_chain->level_chain;
1373 level->level_chain = free_binding_level;
1374 free_binding_level = level;
1377 /* Push a definition or a declaration of struct, union or enum tag "name".
1378 "type" should be the type node.
1379 We assume that the tag "name" is not already defined.
1381 Note that the definition may really be just a forward reference.
1382 In that case, the TYPE_SIZE will be zero. */
1385 pushtag (name, type)
1388 register struct binding_level *b;
1390 /* Find the proper binding level for this type tag. */
1392 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1397 /* Record the identifier as the type's name if it has none. */
1399 if (TYPE_NAME (type) == 0)
1400 TYPE_NAME (type) = name;
1403 if (b == global_binding_level)
1404 b->tags = perm_tree_cons (name, type, b->tags);
1406 b->tags = saveable_tree_cons (name, type, b->tags);
1408 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1409 tagged type we just added to the current binding level. This fake
1410 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1411 to output a representation of a tagged type, and it also gives
1412 us a convenient place to record the "scope start" address for the
1415 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1417 /* An approximation for now, so we can tell this is a function-scope tag.
1418 This will be updated in poplevel. */
1419 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1422 /* Handle when a new declaration NEWDECL
1423 has the same name as an old one OLDDECL
1424 in the same binding contour.
1425 Prints an error message if appropriate.
1427 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1428 Otherwise, return 0.
1430 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1431 and OLDDECL is in an outer binding level and should thus not be changed. */
1434 duplicate_decls (newdecl, olddecl, different_binding_level)
1435 register tree newdecl, olddecl;
1436 int different_binding_level;
1438 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1439 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1440 && DECL_INITIAL (newdecl) != 0);
1441 tree oldtype = TREE_TYPE (olddecl);
1442 tree newtype = TREE_TYPE (newdecl);
1445 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1446 DECL_MACHINE_ATTRIBUTES (newdecl)
1447 = merge_machine_decl_attributes (olddecl, newdecl);
1449 if (TREE_CODE (newtype) == ERROR_MARK
1450 || TREE_CODE (oldtype) == ERROR_MARK)
1453 /* New decl is completely inconsistent with the old one =>
1454 tell caller to replace the old one.
1455 This is always an error except in the case of shadowing a builtin. */
1456 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1458 if (TREE_CODE (olddecl) == FUNCTION_DECL
1459 && (DECL_BUILT_IN (olddecl)
1460 || DECL_BUILT_IN_NONANSI (olddecl)))
1462 /* If you declare a built-in or predefined function name as static,
1463 the old definition is overridden,
1464 but optionally warn this was a bad choice of name. */
1465 if (!TREE_PUBLIC (newdecl))
1469 else if (DECL_BUILT_IN (olddecl))
1470 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1472 warning_with_decl (newdecl, "shadowing library function `%s'");
1474 /* Likewise, if the built-in is not ansi, then programs can
1475 override it even globally without an error. */
1476 else if (! DECL_BUILT_IN (olddecl))
1477 warning_with_decl (newdecl,
1478 "library function `%s' declared as non-function");
1480 else if (DECL_BUILT_IN_NONANSI (olddecl))
1481 warning_with_decl (newdecl,
1482 "built-in function `%s' declared as non-function");
1484 warning_with_decl (newdecl,
1485 "built-in function `%s' declared as non-function");
1489 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1490 error_with_decl (olddecl, "previous declaration of `%s'");
1496 /* For real parm decl following a forward decl,
1497 return 1 so old decl will be reused. */
1498 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1499 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1502 /* The new declaration is the same kind of object as the old one.
1503 The declarations may partially match. Print warnings if they don't
1504 match enough. Ultimately, copy most of the information from the new
1505 decl to the old one, and keep using the old one. */
1507 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1508 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1509 && DECL_INITIAL (olddecl) == 0)
1510 /* If -traditional, avoid error for redeclaring fcn
1511 after implicit decl. */
1513 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1514 && DECL_BUILT_IN (olddecl))
1516 /* A function declaration for a built-in function. */
1517 if (!TREE_PUBLIC (newdecl))
1519 /* If you declare a built-in function name as static, the
1520 built-in definition is overridden,
1521 but optionally warn this was a bad choice of name. */
1523 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1524 /* Discard the old built-in function. */
1527 else if (!types_match)
1529 /* Accept the return type of the new declaration if same modes. */
1530 tree oldreturntype = TREE_TYPE (oldtype);
1531 tree newreturntype = TREE_TYPE (newtype);
1533 /* Make sure we put the new type in the same obstack as the old ones.
1534 If the old types are not both in the same obstack, use the
1536 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1537 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1540 push_obstacks_nochange ();
1541 end_temporary_allocation ();
1544 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1546 /* Function types may be shared, so we can't just modify
1547 the return type of olddecl's function type. */
1549 = build_function_type (newreturntype,
1550 TYPE_ARG_TYPES (oldtype));
1552 types_match = comptypes (newtype, trytype);
1556 /* Accept harmless mismatch in first argument type also.
1558 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1559 && TYPE_ARG_TYPES (oldtype) != 0
1560 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1561 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1562 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1563 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1565 /* Function types may be shared, so we can't just modify
1566 the return type of olddecl's function type. */
1568 = build_function_type (TREE_TYPE (oldtype),
1569 tree_cons (NULL_TREE,
1570 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1571 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1573 types_match = comptypes (newtype, trytype);
1577 if (! different_binding_level)
1578 TREE_TYPE (olddecl) = oldtype;
1584 /* If types don't match for a built-in, throw away the built-in. */
1585 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1589 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1590 && DECL_SOURCE_LINE (olddecl) == 0)
1592 /* A function declaration for a predeclared function
1593 that isn't actually built in. */
1594 if (!TREE_PUBLIC (newdecl))
1596 /* If you declare it as static, the
1597 default definition is overridden. */
1600 else if (!types_match)
1602 /* If the types don't match, preserve volatility indication.
1603 Later on, we will discard everything else about the
1604 default declaration. */
1605 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1608 /* Permit char *foo () to match void *foo (...) if not pedantic,
1609 if one of them came from a system header file. */
1610 else if (!types_match
1611 && TREE_CODE (olddecl) == FUNCTION_DECL
1612 && TREE_CODE (newdecl) == FUNCTION_DECL
1613 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1614 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1615 && (DECL_IN_SYSTEM_HEADER (olddecl)
1616 || DECL_IN_SYSTEM_HEADER (newdecl))
1617 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1618 && TYPE_ARG_TYPES (oldtype) == 0
1619 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1620 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1622 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1623 && TYPE_ARG_TYPES (newtype) == 0
1624 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1625 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1628 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1629 /* Make sure we keep void * as ret type, not char *. */
1630 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1631 TREE_TYPE (newdecl) = newtype = oldtype;
1633 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1634 we will come back here again. */
1635 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1637 else if (!types_match
1638 /* Permit char *foo (int, ...); followed by char *foo ();
1640 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1642 /* Return types must still match. */
1643 && comptypes (TREE_TYPE (oldtype),
1644 TREE_TYPE (newtype))
1645 && TYPE_ARG_TYPES (newtype) == 0))
1647 error_with_decl (newdecl, "conflicting types for `%s'");
1648 /* Check for function type mismatch
1649 involving an empty arglist vs a nonempty one. */
1650 if (TREE_CODE (olddecl) == FUNCTION_DECL
1651 && comptypes (TREE_TYPE (oldtype),
1652 TREE_TYPE (newtype))
1653 && ((TYPE_ARG_TYPES (oldtype) == 0
1654 && DECL_INITIAL (olddecl) == 0)
1656 (TYPE_ARG_TYPES (newtype) == 0
1657 && DECL_INITIAL (newdecl) == 0)))
1659 /* Classify the problem further. */
1660 register tree t = TYPE_ARG_TYPES (oldtype);
1662 t = TYPE_ARG_TYPES (newtype);
1663 for (; t; t = TREE_CHAIN (t))
1665 register tree type = TREE_VALUE (t);
1667 if (TREE_CHAIN (t) == 0
1668 && TYPE_MAIN_VARIANT (type) != void_type_node)
1670 error ("A parameter list with an ellipsis can't match");
1671 error ("an empty parameter name list declaration.");
1675 if (TYPE_MAIN_VARIANT (type) == float_type_node
1676 || C_PROMOTING_INTEGER_TYPE_P (type))
1678 error ("An argument type that has a default promotion");
1679 error ("can't match an empty parameter name list declaration.");
1684 error_with_decl (olddecl, "previous declaration of `%s'");
1688 errmsg = redeclaration_error_message (newdecl, olddecl);
1691 error_with_decl (newdecl, errmsg);
1692 error_with_decl (olddecl,
1693 ((DECL_INITIAL (olddecl)
1694 && current_binding_level == global_binding_level)
1695 ? "`%s' previously defined here"
1696 : "`%s' previously declared here"));
1698 else if (TREE_CODE (newdecl) == TYPE_DECL
1699 && (DECL_IN_SYSTEM_HEADER (olddecl)
1700 || DECL_IN_SYSTEM_HEADER (newdecl)))
1702 warning_with_decl (newdecl, "redefinition of `%s'");
1705 ((DECL_INITIAL (olddecl)
1706 && current_binding_level == global_binding_level)
1707 ? "`%s' previously defined here"
1708 : "`%s' previously declared here"));
1710 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1711 && DECL_INITIAL (olddecl) != 0
1712 && TYPE_ARG_TYPES (oldtype) == 0
1713 && TYPE_ARG_TYPES (newtype) != 0
1714 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1716 register tree type, parm;
1718 /* Prototype decl follows defn w/o prototype. */
1720 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1721 type = TYPE_ARG_TYPES (newtype),
1723 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1724 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1725 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1727 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1728 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1730 errmsg = "prototype for `%s' follows and number of arguments";
1733 /* Type for passing arg must be consistent
1734 with that declared for the arg. */
1735 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1736 /* If -traditional, allow `unsigned int' instead of `int'
1737 in the prototype. */
1738 && (! (flag_traditional
1739 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1740 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1742 errmsg = "prototype for `%s' follows and argument %d";
1748 error_with_decl (newdecl, errmsg, nargs);
1749 error_with_decl (olddecl,
1750 "doesn't match non-prototype definition here");
1754 warning_with_decl (newdecl, "prototype for `%s' follows");
1755 warning_with_decl (olddecl, "non-prototype definition here");
1758 /* Warn about mismatches in various flags. */
1761 /* Warn if function is now inline
1762 but was previously declared not inline and has been called. */
1763 if (TREE_CODE (olddecl) == FUNCTION_DECL
1764 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1765 && TREE_USED (olddecl))
1766 warning_with_decl (newdecl,
1767 "`%s' declared inline after being called");
1768 if (TREE_CODE (olddecl) == FUNCTION_DECL
1769 && ! DECL_INLINE (olddecl) && DECL_INLINE (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 /* Warn when const declaration follows a non-const
1782 declaration, but not for functions. */
1783 if (TREE_CODE (olddecl) != FUNCTION_DECL
1784 && !TREE_READONLY (olddecl)
1785 && TREE_READONLY (newdecl))
1786 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1787 /* These bits are logically part of the type, for variables.
1788 But not for functions
1789 (where qualifiers are not valid ANSI anyway). */
1790 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1791 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1792 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1793 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1797 /* Optionally warn about more than one declaration for the same name. */
1798 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1799 /* Don't warn about a function declaration
1800 followed by a definition. */
1801 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1802 && DECL_INITIAL (olddecl) == 0)
1803 /* Don't warn about extern decl followed by (tentative) definition. */
1804 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1806 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1807 warning_with_decl (olddecl, "previous declaration of `%s'");
1810 /* Copy all the DECL_... slots specified in the new decl
1811 except for any that we copy here from the old type.
1813 Past this point, we don't change OLDTYPE and NEWTYPE
1814 even if we change the types of NEWDECL and OLDDECL. */
1818 /* When copying info to olddecl, we store into write_olddecl
1819 instead. This allows us to avoid modifying olddecl when
1820 different_binding_level is true. */
1821 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1823 /* Make sure we put the new type in the same obstack as the old ones.
1824 If the old types are not both in the same obstack, use the permanent
1826 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1827 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1830 push_obstacks_nochange ();
1831 end_temporary_allocation ();
1834 /* Merge the data types specified in the two decls. */
1835 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1837 if (different_binding_level)
1839 = build_type_attribute_variant
1841 merge_attributes (TYPE_ATTRIBUTES (newtype),
1842 TYPE_ATTRIBUTES (oldtype)));
1845 = TREE_TYPE (olddecl)
1846 = common_type (newtype, oldtype);
1849 /* Lay the type out, unless already done. */
1850 if (oldtype != TREE_TYPE (newdecl))
1852 if (TREE_TYPE (newdecl) != error_mark_node)
1853 layout_type (TREE_TYPE (newdecl));
1854 if (TREE_CODE (newdecl) != FUNCTION_DECL
1855 && TREE_CODE (newdecl) != TYPE_DECL
1856 && TREE_CODE (newdecl) != CONST_DECL)
1857 layout_decl (newdecl, 0);
1861 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1862 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1863 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1864 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1865 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1868 /* Keep the old rtl since we can safely use it. */
1869 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1871 /* Merge the type qualifiers. */
1872 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1873 && !TREE_THIS_VOLATILE (newdecl))
1874 TREE_THIS_VOLATILE (write_olddecl) = 0;
1875 if (TREE_READONLY (newdecl))
1876 TREE_READONLY (write_olddecl) = 1;
1877 if (TREE_THIS_VOLATILE (newdecl))
1879 TREE_THIS_VOLATILE (write_olddecl) = 1;
1880 if (TREE_CODE (newdecl) == VAR_DECL)
1881 make_var_volatile (newdecl);
1884 /* Keep source location of definition rather than declaration. */
1885 /* When called with different_binding_level set, keep the old
1886 information so that meaningful diagnostics can be given. */
1887 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1888 && ! different_binding_level)
1890 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1891 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1894 /* Merge the unused-warning information. */
1895 if (DECL_IN_SYSTEM_HEADER (olddecl))
1896 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1897 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1898 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1900 /* Merge the initialization information. */
1901 /* When called with different_binding_level set, don't copy over
1902 DECL_INITIAL, so that we don't accidentally change function
1903 declarations into function definitions. */
1904 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1905 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1907 /* Merge the section attribute.
1908 We want to issue an error if the sections conflict but that must be
1909 done later in decl_attributes since we are called before attributes
1911 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1912 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1914 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1916 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1917 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1922 /* If cannot merge, then use the new type and qualifiers,
1923 and don't preserve the old rtl. */
1924 else if (! different_binding_level)
1926 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1927 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1928 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1929 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1932 /* Merge the storage class information. */
1933 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1934 /* For functions, static overrides non-static. */
1935 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1937 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1938 /* This is since we don't automatically
1939 copy the attributes of NEWDECL into OLDDECL. */
1940 /* No need to worry about different_binding_level here because
1941 then TREE_PUBLIC (newdecl) was true. */
1942 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1943 /* If this clears `static', clear it in the identifier too. */
1944 if (! TREE_PUBLIC (olddecl))
1945 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1947 if (DECL_EXTERNAL (newdecl))
1949 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1950 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1951 /* An extern decl does not override previous storage class. */
1952 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1953 if (! DECL_EXTERNAL (newdecl))
1954 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1958 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1959 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1962 /* If either decl says `inline', this fn is inline,
1963 unless its definition was passed already. */
1964 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1965 DECL_INLINE (olddecl) = 1;
1966 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1968 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1970 if (DECL_BUILT_IN (olddecl))
1972 /* Get rid of any built-in function if new arg types don't match it
1973 or if we have a function definition. */
1974 if (! types_match || new_is_definition)
1976 if (! different_binding_level)
1978 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1979 DECL_BUILT_IN (olddecl) = 0;
1984 /* If redeclaring a builtin function, and not a definition,
1985 it stays built in. */
1986 DECL_BUILT_IN (newdecl) = 1;
1987 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1990 /* Also preserve various other info from the definition. */
1991 else if (! new_is_definition)
1992 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1993 if (! new_is_definition)
1995 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1996 /* When called with different_binding_level set, don't copy over
1997 DECL_INITIAL, so that we don't accidentally change function
1998 declarations into function definitions. */
1999 if (! different_binding_level)
2000 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2001 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2002 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2003 if (DECL_INLINE (newdecl))
2004 DECL_ABSTRACT_ORIGIN (newdecl) = olddecl;
2007 if (different_binding_level)
2009 /* Don't output a duplicate symbol or debugging information for this
2012 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2013 just have two declarations without a definition. VAR_DECLs may need
2014 the same treatment, I'm not sure. */
2015 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2016 DECL_IGNORED_P (newdecl) = 1;
2018 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2022 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2023 But preserve OLDDECL's DECL_UID. */
2025 register unsigned olddecl_uid = DECL_UID (olddecl);
2027 bcopy ((char *) newdecl + sizeof (struct tree_common),
2028 (char *) olddecl + sizeof (struct tree_common),
2029 sizeof (struct tree_decl) - sizeof (struct tree_common));
2030 DECL_UID (olddecl) = olddecl_uid;
2033 /* NEWDECL contains the merged attribute lists.
2034 Update OLDDECL to be the same. */
2035 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2040 /* Record a decl-node X as belonging to the current lexical scope.
2041 Check for errors (such as an incompatible declaration for the same
2042 name already seen in the same scope).
2044 Returns either X or an old decl for the same name.
2045 If an old decl is returned, it may have been smashed
2046 to agree with what X says. */
2053 register tree name = DECL_NAME (x);
2054 register struct binding_level *b = current_binding_level;
2056 DECL_CONTEXT (x) = current_function_decl;
2057 /* A local extern declaration for a function doesn't constitute nesting.
2058 A local auto declaration does, since it's a forward decl
2059 for a nested function coming later. */
2060 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2061 && DECL_EXTERNAL (x))
2062 DECL_CONTEXT (x) = 0;
2064 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2065 && x != IDENTIFIER_IMPLICIT_DECL (name)
2066 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2067 && !DECL_IN_SYSTEM_HEADER (x))
2068 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2074 int different_binding_level = 0;
2076 t = lookup_name_current_level (name);
2077 /* Don't type check externs here when -traditional. This is so that
2078 code with conflicting declarations inside blocks will get warnings
2079 not errors. X11 for instance depends on this. */
2080 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2082 t = IDENTIFIER_GLOBAL_VALUE (name);
2083 /* Type decls at global scope don't conflict with externs declared
2084 inside lexical blocks. */
2085 if (t && TREE_CODE (t) == TYPE_DECL)
2087 different_binding_level = 1;
2089 if (t != 0 && t == error_mark_node)
2090 /* error_mark_node is 0 for a while during initialization! */
2093 error_with_decl (x, "`%s' used prior to declaration");
2098 file = DECL_SOURCE_FILE (t);
2099 line = DECL_SOURCE_LINE (t);
2102 /* If this decl is `static' and an implicit decl was seen previously,
2103 warn. But don't complain if -traditional,
2104 since traditional compilers don't complain. */
2105 if (! flag_traditional && TREE_PUBLIC (name)
2106 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2107 sets this for all functions. */
2108 && ! TREE_PUBLIC (x)
2109 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2110 /* We used to warn also for explicit extern followed by static,
2111 but sometimes you need to do it that way. */
2112 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2114 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2115 IDENTIFIER_POINTER (name));
2116 pedwarn_with_file_and_line
2117 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2118 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2119 "previous declaration of `%s'",
2120 IDENTIFIER_POINTER (name));
2121 TREE_THIS_VOLATILE (name) = 1;
2124 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2126 if (TREE_CODE (t) == PARM_DECL)
2128 /* Don't allow more than one "real" duplicate
2129 of a forward parm decl. */
2130 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2136 /* If we are processing a typedef statement, generate a whole new
2137 ..._TYPE node (which will be just an variant of the existing
2138 ..._TYPE node with identical properties) and then install the
2139 TYPE_DECL node generated to represent the typedef name as the
2140 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2142 The whole point here is to end up with a situation where each
2143 and every ..._TYPE node the compiler creates will be uniquely
2144 associated with AT MOST one node representing a typedef name.
2145 This way, even though the compiler substitutes corresponding
2146 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2147 early on, later parts of the compiler can always do the reverse
2148 translation and get back the corresponding typedef name. For
2151 typedef struct S MY_TYPE;
2154 Later parts of the compiler might only know that `object' was of
2155 type `struct S' if it were not for code just below. With this
2156 code however, later parts of the compiler see something like:
2158 struct S' == struct S
2159 typedef struct S' MY_TYPE;
2162 And they can then deduce (from the node for type struct S') that
2163 the original object declaration was:
2167 Being able to do this is important for proper support of protoize,
2168 and also for generating precise symbolic debugging information
2169 which takes full account of the programmer's (typedef) vocabulary.
2171 Obviously, we don't want to generate a duplicate ..._TYPE node if
2172 the TYPE_DECL node that we are now processing really represents a
2173 standard built-in type.
2175 Since all standard types are effectively declared at line zero
2176 in the source file, we can easily check to see if we are working
2177 on a standard type by checking the current value of lineno. */
2179 if (TREE_CODE (x) == TYPE_DECL)
2181 if (DECL_SOURCE_LINE (x) == 0)
2183 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2184 TYPE_NAME (TREE_TYPE (x)) = x;
2186 else if (TREE_TYPE (x) != error_mark_node
2187 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2189 tree tt = TREE_TYPE (x);
2190 DECL_ORIGINAL_TYPE (x) = tt;
2191 tt = build_type_copy (tt);
2197 /* Multiple external decls of the same identifier ought to match.
2198 Check against both global declarations (when traditional) and out of
2199 scope (limbo) block level declarations.
2201 We get warnings about inline functions where they are defined.
2202 Avoid duplicate warnings where they are used. */
2203 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2207 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2208 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2209 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2210 decl = IDENTIFIER_GLOBAL_VALUE (name);
2211 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2212 /* Decls in limbo are always extern, so no need to check that. */
2213 decl = IDENTIFIER_LIMBO_VALUE (name);
2217 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2218 /* If old decl is built-in, we already warned if we should. */
2219 && !DECL_BUILT_IN (decl))
2221 pedwarn_with_decl (x,
2222 "type mismatch with previous external decl");
2223 pedwarn_with_decl (decl, "previous external decl of `%s'");
2227 /* If a function has had an implicit declaration, and then is defined,
2228 make sure they are compatible. */
2230 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2231 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2232 && TREE_CODE (x) == FUNCTION_DECL
2233 && ! comptypes (TREE_TYPE (x),
2234 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2236 warning_with_decl (x, "type mismatch with previous implicit declaration");
2237 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2238 "previous implicit declaration of `%s'");
2241 /* In PCC-compatibility mode, extern decls of vars with no current decl
2242 take effect at top level no matter where they are. */
2243 if (flag_traditional && DECL_EXTERNAL (x)
2244 && lookup_name (name) == 0)
2246 tree type = TREE_TYPE (x);
2248 /* But don't do this if the type contains temporary nodes. */
2251 if (type == error_mark_node)
2253 if (! TREE_PERMANENT (type))
2255 warning_with_decl (x, "type of external `%s' is not global");
2256 /* By exiting the loop early, we leave TYPE nonzero,
2257 and thus prevent globalization of the decl. */
2260 else if (TREE_CODE (type) == FUNCTION_TYPE
2261 && TYPE_ARG_TYPES (type) != 0)
2262 /* The types might not be truly local,
2263 but the list of arg types certainly is temporary.
2264 Since prototypes are nontraditional,
2265 ok not to do the traditional thing. */
2267 type = TREE_TYPE (type);
2271 b = global_binding_level;
2274 /* This name is new in its binding level.
2275 Install the new declaration and return it. */
2276 if (b == global_binding_level)
2278 /* Install a global value. */
2280 /* If the first global decl has external linkage,
2281 warn if we later see static one. */
2282 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2283 TREE_PUBLIC (name) = 1;
2285 IDENTIFIER_GLOBAL_VALUE (name) = x;
2287 /* We no longer care about any previous block level declarations. */
2288 IDENTIFIER_LIMBO_VALUE (name) = 0;
2290 /* Don't forget if the function was used via an implicit decl. */
2291 if (IDENTIFIER_IMPLICIT_DECL (name)
2292 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2293 TREE_USED (x) = 1, TREE_USED (name) = 1;
2295 /* Don't forget if its address was taken in that way. */
2296 if (IDENTIFIER_IMPLICIT_DECL (name)
2297 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2298 TREE_ADDRESSABLE (x) = 1;
2300 /* Warn about mismatches against previous implicit decl. */
2301 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2302 /* If this real decl matches the implicit, don't complain. */
2303 && ! (TREE_CODE (x) == FUNCTION_DECL
2304 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2305 == integer_type_node)))
2306 pedwarn ("`%s' was previously implicitly declared to return `int'",
2307 IDENTIFIER_POINTER (name));
2309 /* If this decl is `static' and an `extern' was seen previously,
2310 that is erroneous. */
2311 if (TREE_PUBLIC (name)
2312 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2314 /* Okay to redeclare an ANSI built-in as static. */
2315 if (t != 0 && DECL_BUILT_IN (t))
2317 /* Okay to declare a non-ANSI built-in as anything. */
2318 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2320 /* Okay to have global type decl after an earlier extern
2321 declaration inside a lexical block. */
2322 else if (TREE_CODE (x) == TYPE_DECL)
2324 else if (IDENTIFIER_IMPLICIT_DECL (name))
2326 if (! TREE_THIS_VOLATILE (name))
2327 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2328 IDENTIFIER_POINTER (name));
2331 pedwarn ("`%s' was declared `extern' and later `static'",
2332 IDENTIFIER_POINTER (name));
2337 /* Here to install a non-global value. */
2338 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2339 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2340 IDENTIFIER_LOCAL_VALUE (name) = x;
2342 /* If this is an extern function declaration, see if we
2343 have a global definition or declaration for the function. */
2345 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2347 && TREE_CODE (x) == FUNCTION_DECL
2348 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2350 /* We have one. Their types must agree. */
2351 if (! comptypes (TREE_TYPE (x),
2352 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2353 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2356 /* Inner extern decl is inline if global one is.
2357 Copy enough to really inline it. */
2358 if (DECL_INLINE (oldglobal))
2360 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2361 DECL_INITIAL (x) = (current_function_decl == oldglobal
2362 ? 0 : DECL_INITIAL (oldglobal));
2363 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2364 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2365 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2366 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2367 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2368 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2370 /* Inner extern decl is built-in if global one is. */
2371 if (DECL_BUILT_IN (oldglobal))
2373 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2374 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2376 /* Keep the arg types from a file-scope fcn defn. */
2377 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2378 && DECL_INITIAL (oldglobal)
2379 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2380 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2384 #if 0 /* This case is probably sometimes the right thing to do. */
2385 /* If we have a local external declaration,
2386 then any file-scope declaration should not
2387 have been static. */
2388 if (oldlocal == 0 && oldglobal != 0
2389 && !TREE_PUBLIC (oldglobal)
2390 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2391 warning ("`%s' locally external but globally static",
2392 IDENTIFIER_POINTER (name));
2395 /* If we have a local external declaration,
2396 and no file-scope declaration has yet been seen,
2397 then if we later have a file-scope decl it must not be static. */
2399 && DECL_EXTERNAL (x)
2403 TREE_PUBLIC (name) = 1;
2405 /* Save this decl, so that we can do type checking against
2406 other decls after it falls out of scope.
2408 Only save it once. This prevents temporary decls created in
2409 expand_inline_function from being used here, since this
2410 will have been set when the inline function was parsed.
2411 It also helps give slightly better warnings. */
2412 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2413 IDENTIFIER_LIMBO_VALUE (name) = x;
2416 /* Warn if shadowing an argument at the top level of the body. */
2417 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2418 /* This warning doesn't apply to the parms of a nested fcn. */
2419 && ! current_binding_level->parm_flag
2420 /* Check that this is one level down from the parms. */
2421 && current_binding_level->level_chain->parm_flag
2422 /* Check that the decl being shadowed
2423 comes from the parm level, one level up. */
2424 && chain_member (oldlocal, current_binding_level->level_chain->names))
2426 if (TREE_CODE (oldlocal) == PARM_DECL)
2427 pedwarn ("declaration of `%s' shadows a parameter",
2428 IDENTIFIER_POINTER (name));
2430 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2431 IDENTIFIER_POINTER (name));
2434 /* Maybe warn if shadowing something else. */
2435 else if (warn_shadow && !DECL_EXTERNAL (x)
2436 /* No shadow warnings for internally generated vars. */
2437 && DECL_SOURCE_LINE (x) != 0
2438 /* No shadow warnings for vars made for inlining. */
2439 && ! DECL_FROM_INLINE (x))
2441 char *warnstring = 0;
2443 if (TREE_CODE (x) == PARM_DECL
2444 && current_binding_level->level_chain->parm_flag)
2445 /* Don't warn about the parm names in function declarator
2446 within a function declarator.
2447 It would be nice to avoid warning in any function
2448 declarator in a declaration, as opposed to a definition,
2449 but there is no way to tell it's not a definition. */
2451 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2452 warnstring = "declaration of `%s' shadows a parameter";
2453 else if (oldlocal != 0)
2454 warnstring = "declaration of `%s' shadows previous local";
2455 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2456 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2457 warnstring = "declaration of `%s' shadows global declaration";
2460 warning (warnstring, IDENTIFIER_POINTER (name));
2463 /* If storing a local value, there may already be one (inherited).
2464 If so, record it for restoration when this binding level ends. */
2466 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2469 /* Keep count of variables in this level with incomplete type. */
2470 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2474 /* Put decls on list in reverse order.
2475 We will reverse them later if necessary. */
2476 TREE_CHAIN (x) = b->names;
2482 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2485 pushdecl_top_level (x)
2489 register struct binding_level *b = current_binding_level;
2491 current_binding_level = global_binding_level;
2493 current_binding_level = b;
2497 /* Generate an implicit declaration for identifier FUNCTIONID
2498 as a function of type int (). Print a warning if appropriate. */
2501 implicitly_declare (functionid)
2505 int traditional_warning = 0;
2506 /* Only one "implicit declaration" warning per identifier. */
2507 int implicit_warning;
2509 /* Save the decl permanently so we can warn if definition follows. */
2510 push_obstacks_nochange ();
2511 end_temporary_allocation ();
2513 /* We used to reuse an old implicit decl here,
2514 but this loses with inline functions because it can clobber
2515 the saved decl chains. */
2516 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2517 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2519 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2521 /* Warn of implicit decl following explicit local extern decl.
2522 This is probably a program designed for traditional C. */
2523 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2524 traditional_warning = 1;
2526 /* Warn once of an implicit declaration. */
2527 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2529 DECL_EXTERNAL (decl) = 1;
2530 TREE_PUBLIC (decl) = 1;
2532 /* Record that we have an implicit decl and this is it. */
2533 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2535 /* ANSI standard says implicit declarations are in the innermost block.
2536 So we record the decl in the standard fashion.
2537 If flag_traditional is set, pushdecl does it top-level. */
2540 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2541 maybe_objc_check_decl (decl);
2543 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2545 if (mesg_implicit_function_declaration && implicit_warning)
2547 if (mesg_implicit_function_declaration == 2)
2548 error ("implicit declaration of function `%s'",
2549 IDENTIFIER_POINTER (functionid));
2551 warning ("implicit declaration of function `%s'",
2552 IDENTIFIER_POINTER (functionid));
2554 else if (warn_traditional && traditional_warning)
2555 warning ("function `%s' was previously declared within a block",
2556 IDENTIFIER_POINTER (functionid));
2558 /* Write a record describing this implicit function declaration to the
2559 prototypes file (if requested). */
2561 gen_aux_info_record (decl, 0, 1, 0);
2568 /* Return zero if the declaration NEWDECL is valid
2569 when the declaration OLDDECL (assumed to be for the same name)
2570 has already been seen.
2571 Otherwise return an error message format string with a %s
2572 where the identifier should go. */
2575 redeclaration_error_message (newdecl, olddecl)
2576 tree newdecl, olddecl;
2578 if (TREE_CODE (newdecl) == TYPE_DECL)
2580 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2582 /* pushdecl creates distinct types for TYPE_DECLs by calling
2583 build_type_copy, so the above comparison generally fails. We do
2584 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2585 is equivalent to what this code used to do before the build_type_copy
2586 call. The variant type distinction should not matter for traditional
2587 code, because it doesn't have type qualifiers. */
2588 if (flag_traditional
2589 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2591 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2593 return "redefinition of `%s'";
2595 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2597 /* Declarations of functions can insist on internal linkage
2598 but they can't be inconsistent with internal linkage,
2599 so there can be no error on that account.
2600 However defining the same name twice is no good. */
2601 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2602 /* However, defining once as extern inline and a second
2603 time in another way is ok. */
2604 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2605 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2606 return "redefinition of `%s'";
2609 else if (current_binding_level == global_binding_level)
2611 /* Objects declared at top level: */
2612 /* If at least one is a reference, it's ok. */
2613 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2615 /* Reject two definitions. */
2616 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2617 return "redefinition of `%s'";
2618 /* Now we have two tentative defs, or one tentative and one real def. */
2619 /* Insist that the linkage match. */
2620 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2621 return "conflicting declarations of `%s'";
2624 else if (current_binding_level->parm_flag
2625 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2629 /* Newdecl has block scope. If olddecl has block scope also, then
2630 reject two definitions, and reject a definition together with an
2631 external reference. Otherwise, it is OK, because newdecl must
2632 be an extern reference to olddecl. */
2633 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2634 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2635 return "redeclaration of `%s'";
2640 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2641 Create one if none exists so far for the current function.
2642 This function is called for both label definitions and label references. */
2648 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2650 if (current_function_decl == 0)
2652 error ("label %s referenced outside of any function",
2653 IDENTIFIER_POINTER (id));
2657 /* Use a label already defined or ref'd with this name. */
2660 /* But not if it is inherited and wasn't declared to be inheritable. */
2661 if (DECL_CONTEXT (decl) != current_function_decl
2662 && ! C_DECLARED_LABEL_FLAG (decl))
2663 return shadow_label (id);
2667 decl = build_decl (LABEL_DECL, id, void_type_node);
2669 /* Make sure every label has an rtx. */
2672 /* A label not explicitly declared must be local to where it's ref'd. */
2673 DECL_CONTEXT (decl) = current_function_decl;
2675 DECL_MODE (decl) = VOIDmode;
2677 /* Say where one reference is to the label,
2678 for the sake of the error if it is not defined. */
2679 DECL_SOURCE_LINE (decl) = lineno;
2680 DECL_SOURCE_FILE (decl) = input_filename;
2682 IDENTIFIER_LABEL_VALUE (id) = decl;
2684 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2689 /* Make a label named NAME in the current function,
2690 shadowing silently any that may be inherited from containing functions
2691 or containing scopes.
2693 Note that valid use, if the label being shadowed
2694 comes from another scope in the same function,
2695 requires calling declare_nonlocal_label right away. */
2701 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2707 /* Check to make sure that the label hasn't already been declared
2708 at this label scope */
2709 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2710 if (TREE_VALUE (dup) == decl)
2712 error ("duplicate label declaration `%s'",
2713 IDENTIFIER_POINTER (name));
2714 error_with_decl (TREE_VALUE (dup),
2715 "this is a previous declaration");
2716 /* Just use the previous declaration. */
2717 return lookup_label (name);
2720 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2721 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2724 return lookup_label (name);
2727 /* Define a label, specifying the location in the source file.
2728 Return the LABEL_DECL node for the label, if the definition is valid.
2729 Otherwise return 0. */
2732 define_label (filename, line, name)
2737 tree decl = lookup_label (name);
2739 /* If label with this name is known from an outer context, shadow it. */
2740 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2742 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2743 IDENTIFIER_LABEL_VALUE (name) = 0;
2744 decl = lookup_label (name);
2747 if (DECL_INITIAL (decl) != 0)
2749 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2754 /* Mark label as having been defined. */
2755 DECL_INITIAL (decl) = error_mark_node;
2756 /* Say where in the source. */
2757 DECL_SOURCE_FILE (decl) = filename;
2758 DECL_SOURCE_LINE (decl) = line;
2763 /* Return the list of declarations of the current level.
2764 Note that this list is in reverse order unless/until
2765 you nreverse it; and when you do nreverse it, you must
2766 store the result back using `storedecls' or you will lose. */
2771 return current_binding_level->names;
2774 /* Return the list of type-tags (for structs, etc) of the current level. */
2779 return current_binding_level->tags;
2782 /* Store the list of declarations of the current level.
2783 This is done for the parameter declarations of a function being defined,
2784 after they are modified in the light of any missing parameters. */
2790 current_binding_level->names = decls;
2793 /* Similarly, store the list of tags of the current level. */
2799 current_binding_level->tags = tags;
2802 /* Given NAME, an IDENTIFIER_NODE,
2803 return the structure (or union or enum) definition for that name.
2804 Searches binding levels from BINDING_LEVEL up to the global level.
2805 If THISLEVEL_ONLY is nonzero, searches only the specified context
2806 (but skips any tag-transparent contexts to find one that is
2807 meaningful for tags).
2808 CODE says which kind of type the caller wants;
2809 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2810 If the wrong kind of type is found, an error is reported. */
2813 lookup_tag (code, name, binding_level, thislevel_only)
2814 enum tree_code code;
2815 struct binding_level *binding_level;
2819 register struct binding_level *level;
2821 for (level = binding_level; level; level = level->level_chain)
2824 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2826 if (TREE_PURPOSE (tail) == name)
2828 if (TREE_CODE (TREE_VALUE (tail)) != code)
2830 /* Definition isn't the kind we were looking for. */
2831 pending_invalid_xref = name;
2832 pending_invalid_xref_file = input_filename;
2833 pending_invalid_xref_line = lineno;
2835 return TREE_VALUE (tail);
2838 if (thislevel_only && ! level->tag_transparent)
2844 /* Print an error message now
2845 for a recent invalid struct, union or enum cross reference.
2846 We don't print them immediately because they are not invalid
2847 when used in the `struct foo;' construct for shadowing. */
2850 pending_xref_error ()
2852 if (pending_invalid_xref != 0)
2853 error_with_file_and_line (pending_invalid_xref_file,
2854 pending_invalid_xref_line,
2855 "`%s' defined as wrong kind of tag",
2856 IDENTIFIER_POINTER (pending_invalid_xref));
2857 pending_invalid_xref = 0;
2860 /* Given a type, find the tag that was defined for it and return the tag name.
2861 Otherwise return 0. */
2864 lookup_tag_reverse (type)
2867 register struct binding_level *level;
2869 for (level = current_binding_level; level; level = level->level_chain)
2872 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2874 if (TREE_VALUE (tail) == type)
2875 return TREE_PURPOSE (tail);
2881 /* Look up NAME in the current binding level and its superiors
2882 in the namespace of variables, functions and typedefs.
2883 Return a ..._DECL node of some kind representing its definition,
2884 or return 0 if it is undefined. */
2891 if (current_binding_level != global_binding_level
2892 && IDENTIFIER_LOCAL_VALUE (name))
2893 val = IDENTIFIER_LOCAL_VALUE (name);
2895 val = IDENTIFIER_GLOBAL_VALUE (name);
2899 /* Similar to `lookup_name' but look only at current binding level. */
2902 lookup_name_current_level (name)
2907 if (current_binding_level == global_binding_level)
2908 return IDENTIFIER_GLOBAL_VALUE (name);
2910 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2913 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2914 if (DECL_NAME (t) == name)
2920 /* Create the predefined scalar types of C,
2921 and some nodes representing standard constants (0, 1, (void *) 0).
2922 Initialize the global binding level.
2923 Make definitions for built-in primitive functions. */
2926 init_decl_processing ()
2928 register tree endlink;
2929 /* Either char* or void*. */
2930 tree traditional_ptr_type_node;
2931 /* Data types of memcpy and strlen. */
2932 tree memcpy_ftype, memset_ftype, strlen_ftype;
2933 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2934 int wchar_type_size;
2936 tree array_domain_type;
2938 current_function_decl = NULL;
2939 named_labels = NULL;
2940 current_binding_level = NULL_BINDING_LEVEL;
2941 free_binding_level = NULL_BINDING_LEVEL;
2942 pushlevel (0); /* make the binding_level structure for global names */
2943 global_binding_level = current_binding_level;
2945 /* Define `int' and `char' first so that dbx will output them first. */
2947 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2948 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2949 integer_type_node));
2951 /* Define `char', which is like either `signed char' or `unsigned char'
2952 but not the same as either. */
2956 ? make_signed_type (CHAR_TYPE_SIZE)
2957 : make_unsigned_type (CHAR_TYPE_SIZE));
2958 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2961 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2962 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2963 long_integer_type_node));
2965 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2966 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2967 unsigned_type_node));
2969 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2970 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2971 long_unsigned_type_node));
2973 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2974 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2975 long_long_integer_type_node));
2977 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2979 long_long_unsigned_type_node));
2981 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2983 short_integer_type_node));
2985 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2986 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2987 short_unsigned_type_node));
2989 /* `unsigned long' is the standard type for sizeof.
2990 Traditionally, use a signed type.
2991 Note that stddef.h uses `unsigned long',
2992 and this must agree, even if long and int are the same size. */
2994 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2995 if (flag_traditional && TREE_UNSIGNED (sizetype))
2996 set_sizetype (signed_type (sizetype));
2999 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3001 error_mark_node = make_node (ERROR_MARK);
3002 TREE_TYPE (error_mark_node) = error_mark_node;
3004 /* Define both `signed char' and `unsigned char'. */
3005 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3006 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3007 signed_char_type_node));
3009 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3010 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3011 unsigned_char_type_node));
3013 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3014 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3016 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3017 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3019 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3020 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3022 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3023 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3025 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3026 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3028 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3029 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3031 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3032 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3034 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3035 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3037 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3038 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3040 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3041 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3043 float_type_node = make_node (REAL_TYPE);
3044 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3045 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3047 layout_type (float_type_node);
3049 double_type_node = make_node (REAL_TYPE);
3050 if (flag_short_double)
3051 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3053 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3054 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3056 layout_type (double_type_node);
3058 long_double_type_node = make_node (REAL_TYPE);
3059 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3060 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3061 long_double_type_node));
3062 layout_type (long_double_type_node);
3064 complex_integer_type_node = make_node (COMPLEX_TYPE);
3065 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3066 complex_integer_type_node));
3067 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3068 layout_type (complex_integer_type_node);
3070 complex_float_type_node = make_node (COMPLEX_TYPE);
3071 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3072 complex_float_type_node));
3073 TREE_TYPE (complex_float_type_node) = float_type_node;
3074 layout_type (complex_float_type_node);
3076 complex_double_type_node = make_node (COMPLEX_TYPE);
3077 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3078 complex_double_type_node));
3079 TREE_TYPE (complex_double_type_node) = double_type_node;
3080 layout_type (complex_double_type_node);
3082 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3084 complex_long_double_type_node));
3085 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3086 layout_type (complex_long_double_type_node);
3089 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3090 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3091 signed_wchar_type_node = signed_type (wchar_type_node);
3092 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3094 integer_zero_node = build_int_2 (0, 0);
3095 TREE_TYPE (integer_zero_node) = integer_type_node;
3096 integer_one_node = build_int_2 (1, 0);
3097 TREE_TYPE (integer_one_node) = integer_type_node;
3099 boolean_type_node = integer_type_node;
3100 boolean_true_node = integer_one_node;
3101 boolean_false_node = integer_zero_node;
3103 size_zero_node = build_int_2 (0, 0);
3104 TREE_TYPE (size_zero_node) = sizetype;
3105 size_one_node = build_int_2 (1, 0);
3106 TREE_TYPE (size_one_node) = sizetype;
3108 void_type_node = make_node (VOID_TYPE);
3109 pushdecl (build_decl (TYPE_DECL,
3110 ridpointers[(int) RID_VOID], void_type_node));
3111 layout_type (void_type_node); /* Uses integer_zero_node */
3112 /* We are not going to have real types in C with less than byte alignment,
3113 so we might as well not have any types that claim to have it. */
3114 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3116 null_pointer_node = build_int_2 (0, 0);
3117 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3118 layout_type (TREE_TYPE (null_pointer_node));
3120 string_type_node = build_pointer_type (char_type_node);
3121 const_string_type_node
3122 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3124 /* Make a type to be the domain of a few array types
3125 whose domains don't really matter.
3126 200 is small enough that it always fits in size_t
3127 and large enough that it can hold most function names for the
3128 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3129 array_domain_type = build_index_type (build_int_2 (200, 0));
3131 /* make a type for arrays of characters.
3132 With luck nothing will ever really depend on the length of this
3134 char_array_type_node
3135 = build_array_type (char_type_node, array_domain_type);
3136 /* Likewise for arrays of ints. */
3138 = build_array_type (integer_type_node, array_domain_type);
3139 /* This is for wide string constants. */
3140 wchar_array_type_node
3141 = build_array_type (wchar_type_node, array_domain_type);
3143 default_function_type
3144 = build_function_type (integer_type_node, NULL_TREE);
3146 ptr_type_node = build_pointer_type (void_type_node);
3148 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3150 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3153 = build_function_type (void_type_node, NULL_TREE);
3156 = build_function_type (float_type_node,
3157 tree_cons (NULL_TREE, float_type_node, endlink));
3160 = build_function_type (double_type_node,
3161 tree_cons (NULL_TREE, double_type_node, endlink));
3163 ldouble_ftype_ldouble
3164 = build_function_type (long_double_type_node,
3165 tree_cons (NULL_TREE, long_double_type_node,
3168 double_ftype_double_double
3169 = build_function_type (double_type_node,
3170 tree_cons (NULL_TREE, double_type_node,
3171 tree_cons (NULL_TREE,
3172 double_type_node, endlink)));
3175 = build_function_type (integer_type_node,
3176 tree_cons (NULL_TREE, integer_type_node, endlink));
3179 = build_function_type (long_integer_type_node,
3180 tree_cons (NULL_TREE,
3181 long_integer_type_node, endlink));
3183 void_ftype_ptr_ptr_int
3184 = build_function_type (void_type_node,
3185 tree_cons (NULL_TREE, ptr_type_node,
3186 tree_cons (NULL_TREE, ptr_type_node,
3187 tree_cons (NULL_TREE,
3191 int_ftype_cptr_cptr_sizet
3192 = build_function_type (integer_type_node,
3193 tree_cons (NULL_TREE, const_ptr_type_node,
3194 tree_cons (NULL_TREE, const_ptr_type_node,
3195 tree_cons (NULL_TREE,
3199 void_ftype_ptr_int_int
3200 = build_function_type (void_type_node,
3201 tree_cons (NULL_TREE, ptr_type_node,
3202 tree_cons (NULL_TREE, integer_type_node,
3203 tree_cons (NULL_TREE,
3207 string_ftype_ptr_ptr /* strcpy prototype */
3208 = build_function_type (string_type_node,
3209 tree_cons (NULL_TREE, string_type_node,
3210 tree_cons (NULL_TREE,
3211 const_string_type_node,
3214 int_ftype_string_string /* strcmp prototype */
3215 = build_function_type (integer_type_node,
3216 tree_cons (NULL_TREE, const_string_type_node,
3217 tree_cons (NULL_TREE,
3218 const_string_type_node,
3221 strlen_ftype /* strlen prototype */
3222 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3223 tree_cons (NULL_TREE, const_string_type_node,
3226 traditional_ptr_type_node
3227 = (flag_traditional ? string_type_node : ptr_type_node);
3229 memcpy_ftype /* memcpy prototype */
3230 = build_function_type (traditional_ptr_type_node,
3231 tree_cons (NULL_TREE, ptr_type_node,
3232 tree_cons (NULL_TREE, const_ptr_type_node,
3233 tree_cons (NULL_TREE,
3237 memset_ftype /* memset prototype */
3238 = build_function_type (traditional_ptr_type_node,
3239 tree_cons (NULL_TREE, ptr_type_node,
3240 tree_cons (NULL_TREE, integer_type_node,
3241 tree_cons (NULL_TREE,
3245 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3247 = build_function_type (ptr_type_node,
3248 tree_cons (NULL_TREE, ptr_type_node, endlink));
3250 builtin_function ("__builtin_constant_p", default_function_type,
3251 BUILT_IN_CONSTANT_P, NULL_PTR);
3253 builtin_function ("__builtin_return_address",
3254 build_function_type (ptr_type_node,
3255 tree_cons (NULL_TREE,
3258 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3260 builtin_function ("__builtin_frame_address",
3261 build_function_type (ptr_type_node,
3262 tree_cons (NULL_TREE,
3265 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3267 builtin_function ("__builtin_aggregate_incoming_address",
3268 build_function_type (ptr_type_node, NULL_TREE),
3269 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3271 /* Hooks for the DWARF 2 __throw routine. */
3272 builtin_function ("__builtin_unwind_init",
3273 build_function_type (void_type_node, endlink),
3274 BUILT_IN_UNWIND_INIT, NULL_PTR);
3275 builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
3276 builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
3277 builtin_function ("__builtin_dwarf_fp_regnum",
3278 build_function_type (unsigned_type_node, endlink),
3279 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3280 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3281 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3282 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3283 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3284 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3285 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3286 builtin_function ("__builtin_set_return_addr_reg",
3287 build_function_type (void_type_node,
3288 tree_cons (NULL_TREE,
3291 BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
3292 builtin_function ("__builtin_eh_stub_old", ptr_ftype_void,
3293 BUILT_IN_EH_STUB_OLD, NULL_PTR);
3294 builtin_function ("__builtin_eh_stub", ptr_ftype_void,
3295 BUILT_IN_EH_STUB, NULL_PTR);
3297 ("__builtin_set_eh_regs",
3298 build_function_type (void_type_node,
3299 tree_cons (NULL_TREE, ptr_type_node,
3300 tree_cons (NULL_TREE,
3301 type_for_mode (ptr_mode, 0),
3303 BUILT_IN_SET_EH_REGS, NULL_PTR);
3305 builtin_function ("__builtin_alloca",
3306 build_function_type (ptr_type_node,
3307 tree_cons (NULL_TREE,
3310 BUILT_IN_ALLOCA, "alloca");
3311 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3312 /* Define alloca, ffs as builtins.
3313 Declare _exit just to mark it as volatile. */
3314 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3316 temp = builtin_function ("alloca",
3317 build_function_type (ptr_type_node,
3318 tree_cons (NULL_TREE,
3321 BUILT_IN_ALLOCA, NULL_PTR);
3322 /* Suppress error if redefined as a non-function. */
3323 DECL_BUILT_IN_NONANSI (temp) = 1;
3324 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3325 /* Suppress error if redefined as a non-function. */
3326 DECL_BUILT_IN_NONANSI (temp) = 1;
3327 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3329 TREE_THIS_VOLATILE (temp) = 1;
3330 TREE_SIDE_EFFECTS (temp) = 1;
3331 /* Suppress error if redefined as a non-function. */
3332 DECL_BUILT_IN_NONANSI (temp) = 1;
3335 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3336 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3338 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3340 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3342 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3344 builtin_function ("__builtin_saveregs",
3345 build_function_type (ptr_type_node, NULL_TREE),
3346 BUILT_IN_SAVEREGS, NULL_PTR);
3347 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3349 builtin_function ("__builtin_varargs",
3350 build_function_type (ptr_type_node,
3351 tree_cons (NULL_TREE,
3354 BUILT_IN_VARARGS, NULL_PTR);
3356 builtin_function ("__builtin_classify_type", default_function_type,
3357 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3358 builtin_function ("__builtin_next_arg",
3359 build_function_type (ptr_type_node, NULL_TREE),
3360 BUILT_IN_NEXT_ARG, NULL_PTR);
3361 builtin_function ("__builtin_args_info",
3362 build_function_type (integer_type_node,
3363 tree_cons (NULL_TREE,
3366 BUILT_IN_ARGS_INFO, NULL_PTR);
3368 /* Untyped call and return. */
3369 builtin_function ("__builtin_apply_args",
3370 build_function_type (ptr_type_node, NULL_TREE),
3371 BUILT_IN_APPLY_ARGS, NULL_PTR);
3373 temp = tree_cons (NULL_TREE,
3374 build_pointer_type (build_function_type (void_type_node,
3376 tree_cons (NULL_TREE,
3378 tree_cons (NULL_TREE,
3381 builtin_function ("__builtin_apply",
3382 build_function_type (ptr_type_node, temp),
3383 BUILT_IN_APPLY, NULL_PTR);
3384 builtin_function ("__builtin_return",
3385 build_function_type (void_type_node,
3386 tree_cons (NULL_TREE,
3389 BUILT_IN_RETURN, NULL_PTR);
3391 /* Currently under experimentation. */
3392 builtin_function ("__builtin_memcpy", memcpy_ftype,
3393 BUILT_IN_MEMCPY, "memcpy");
3394 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3395 BUILT_IN_MEMCMP, "memcmp");
3396 builtin_function ("__builtin_memset", memset_ftype,
3397 BUILT_IN_MEMSET, "memset");
3398 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3399 BUILT_IN_STRCMP, "strcmp");
3400 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3401 BUILT_IN_STRCPY, "strcpy");
3402 builtin_function ("__builtin_strlen", strlen_ftype,
3403 BUILT_IN_STRLEN, "strlen");
3404 builtin_function ("__builtin_sqrtf", float_ftype_float,
3405 BUILT_IN_FSQRT, "sqrtf");
3406 builtin_function ("__builtin_fsqrt", double_ftype_double,
3407 BUILT_IN_FSQRT, "sqrt");
3408 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3409 BUILT_IN_FSQRT, "sqrtl");
3410 builtin_function ("__builtin_sinf", float_ftype_float,
3411 BUILT_IN_SIN, "sinf");
3412 builtin_function ("__builtin_sin", double_ftype_double,
3413 BUILT_IN_SIN, "sin");
3414 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3415 BUILT_IN_SIN, "sinl");
3416 builtin_function ("__builtin_cosf", float_ftype_float,
3417 BUILT_IN_COS, "cosf");
3418 builtin_function ("__builtin_cos", double_ftype_double,
3419 BUILT_IN_COS, "cos");
3420 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3421 BUILT_IN_COS, "cosl");
3422 builtin_function ("__builtin_setjmp",
3423 build_function_type (integer_type_node,
3424 tree_cons (NULL_TREE,
3425 ptr_type_node, endlink)),
3426 BUILT_IN_SETJMP, NULL_PTR);
3427 builtin_function ("__builtin_longjmp",
3430 tree_cons (NULL, ptr_type_node,
3431 tree_cons (NULL_TREE,
3434 BUILT_IN_LONGJMP, NULL_PTR);
3435 builtin_function ("__builtin_trap",
3436 build_function_type (void_type_node, endlink),
3437 BUILT_IN_TRAP, NULL_PTR);
3439 /* In an ANSI C program, it is okay to supply built-in meanings
3440 for these functions, since applications cannot validly use them
3441 with any other meaning.
3442 However, honor the -fno-builtin option. */
3443 if (!flag_no_builtin)
3445 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3446 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3447 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3448 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3450 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3451 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3452 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3454 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3455 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3457 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3459 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3460 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3461 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3462 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3464 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3465 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3466 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3467 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3468 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3469 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3471 /* Declare these functions volatile
3472 to avoid spurious "control drops through" warnings. */
3473 /* Don't specify the argument types, to avoid errors
3474 from certain code which isn't valid in ANSI but which exists. */
3475 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3477 TREE_THIS_VOLATILE (temp) = 1;
3478 TREE_SIDE_EFFECTS (temp) = 1;
3479 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3480 TREE_THIS_VOLATILE (temp) = 1;
3481 TREE_SIDE_EFFECTS (temp) = 1;
3485 /* Support for these has not been written in either expand_builtin
3486 or build_function_call. */
3487 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3488 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3489 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3491 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3493 builtin_function ("__builtin_fmod", double_ftype_double_double,
3494 BUILT_IN_FMOD, NULL_PTR);
3495 builtin_function ("__builtin_frem", double_ftype_double_double,
3496 BUILT_IN_FREM, NULL_PTR);
3497 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3499 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3503 pedantic_lvalues = pedantic;
3505 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3506 declare_function_name ();
3508 start_identifier_warnings ();
3510 /* Prepare to check format strings against argument lists. */
3511 init_function_format_info ();
3515 incomplete_decl_finalize_hook = finish_incomplete_decl;
3517 lang_get_alias_set = &c_get_alias_set;
3520 /* Return a definition for a builtin function named NAME and whose data type
3521 is TYPE. TYPE should be a function type with argument types.
3522 FUNCTION_CODE tells later passes how to compile calls to this function.
3523 See tree.h for its possible values.
3525 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3526 the name to be called if we can't opencode the function. */
3529 builtin_function (name, type, function_code, library_name)
3532 enum built_in_function function_code;
3535 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3536 DECL_EXTERNAL (decl) = 1;
3537 TREE_PUBLIC (decl) = 1;
3538 /* If -traditional, permit redefining a builtin function any way you like.
3539 (Though really, if the program redefines these functions,
3540 it probably won't work right unless compiled with -fno-builtin.) */
3541 if (flag_traditional && name[0] != '_')
3542 DECL_BUILT_IN_NONANSI (decl) = 1;
3544 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3545 make_decl_rtl (decl, NULL_PTR, 1);
3547 if (function_code != NOT_BUILT_IN)
3549 DECL_BUILT_IN (decl) = 1;
3550 DECL_FUNCTION_CODE (decl) = function_code;
3552 /* Warn if a function in the namespace for users
3553 is used without an occasion to consider it declared. */
3554 if (name[0] != '_' || name[1] != '_')
3555 C_DECL_ANTICIPATED (decl) = 1;
3560 /* Called when a declaration is seen that contains no names to declare.
3561 If its type is a reference to a structure, union or enum inherited
3562 from a containing scope, shadow that tag name for the current scope
3563 with a forward reference.
3564 If its type defines a new named structure or union
3565 or defines an enum, it is valid but we need not do anything here.
3566 Otherwise, it is an error. */
3569 shadow_tag (declspecs)
3572 shadow_tag_warned (declspecs, 0);
3576 shadow_tag_warned (declspecs, warned)
3579 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3586 pending_invalid_xref = 0;
3588 /* Remove the attributes from declspecs, since they will confuse the
3590 split_specs_attrs (declspecs, &specs, &attrs);
3592 for (link = specs; link; link = TREE_CHAIN (link))
3594 register tree value = TREE_VALUE (link);
3595 register enum tree_code code = TREE_CODE (value);
3597 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3598 /* Used to test also that TYPE_SIZE (value) != 0.
3599 That caused warning for `struct foo;' at top level in the file. */
3601 register tree name = lookup_tag_reverse (value);
3608 if (warned != 1 && code != ENUMERAL_TYPE)
3609 /* Empty unnamed enum OK */
3611 pedwarn ("unnamed struct/union that defines no instances");
3617 t = lookup_tag (code, name, current_binding_level, 1);
3621 t = make_node (code);
3628 if (!warned && ! in_system_header)
3630 warning ("useless keyword or type name in empty declaration");
3637 error ("two types specified in one empty declaration");
3642 pedwarn ("empty declaration");
3646 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3649 groktypename (typename)
3652 if (TREE_CODE (typename) != TREE_LIST)
3654 return grokdeclarator (TREE_VALUE (typename),
3655 TREE_PURPOSE (typename),
3659 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3662 groktypename_in_parm_context (typename)
3665 if (TREE_CODE (typename) != TREE_LIST)
3667 return grokdeclarator (TREE_VALUE (typename),
3668 TREE_PURPOSE (typename),
3672 /* Decode a declarator in an ordinary declaration or data definition.
3673 This is called as soon as the type information and variable name
3674 have been parsed, before parsing the initializer if any.
3675 Here we create the ..._DECL node, fill in its type,
3676 and put it on the list of decls for the current context.
3677 The ..._DECL node is returned as the value.
3679 Exception: for arrays where the length is not specified,
3680 the type is left null, to be filled in by `finish_decl'.
3682 Function definitions do not come here; they go to start_function
3683 instead. However, external and forward declarations of functions
3684 do go through here. Structure field declarations are done by
3685 grokfield and not through here. */
3687 /* Set this to zero to debug not using the temporary obstack
3688 to parse initializers. */
3689 int debug_temp_inits = 1;
3692 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3693 tree declarator, declspecs;
3695 tree attributes, prefix_attributes;
3697 register tree decl = grokdeclarator (declarator, declspecs,
3698 NORMAL, initialized);
3700 int init_written = initialized;
3702 /* The corresponding pop_obstacks is in finish_decl. */
3703 push_obstacks_nochange ();
3705 if (warn_main && TREE_CODE (decl) != FUNCTION_DECL
3706 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3707 warning_with_decl (decl, "`%s' is usually a function");
3710 /* Is it valid for this decl to have an initializer at all?
3711 If not, set INITIALIZED to zero, which will indirectly
3712 tell `finish_decl' to ignore the initializer once it is parsed. */
3713 switch (TREE_CODE (decl))
3716 /* typedef foo = bar means give foo the same type as bar.
3717 We haven't parsed bar yet, so `finish_decl' will fix that up.
3718 Any other case of an initialization in a TYPE_DECL is an error. */
3719 if (pedantic || list_length (declspecs) > 1)
3721 error ("typedef `%s' is initialized",
3722 IDENTIFIER_POINTER (DECL_NAME (decl)));
3728 error ("function `%s' is initialized like a variable",
3729 IDENTIFIER_POINTER (DECL_NAME (decl)));
3734 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3735 error ("parameter `%s' is initialized",
3736 IDENTIFIER_POINTER (DECL_NAME (decl)));
3741 /* Don't allow initializations for incomplete types
3742 except for arrays which might be completed by the initialization. */
3743 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3745 /* A complete type is ok if size is fixed. */
3747 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3748 || C_DECL_VARIABLE_SIZE (decl))
3750 error ("variable-sized object may not be initialized");
3754 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3756 error ("variable `%s' has initializer but incomplete type",
3757 IDENTIFIER_POINTER (DECL_NAME (decl)));
3760 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3762 error ("elements of array `%s' have incomplete type",
3763 IDENTIFIER_POINTER (DECL_NAME (decl)));
3770 #if 0 /* Seems redundant with grokdeclarator. */
3771 if (current_binding_level != global_binding_level
3772 && DECL_EXTERNAL (decl)
3773 && TREE_CODE (decl) != FUNCTION_DECL)
3774 warning ("declaration of `%s' has `extern' and is initialized",
3775 IDENTIFIER_POINTER (DECL_NAME (decl)));
3777 DECL_EXTERNAL (decl) = 0;
3778 if (current_binding_level == global_binding_level)
3779 TREE_STATIC (decl) = 1;
3781 /* Tell `pushdecl' this is an initialized decl
3782 even though we don't yet have the initializer expression.
3783 Also tell `finish_decl' it may store the real initializer. */
3784 DECL_INITIAL (decl) = error_mark_node;
3787 /* If this is a function declaration, write a record describing it to the
3788 prototypes file (if requested). */
3790 if (TREE_CODE (decl) == FUNCTION_DECL)
3791 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3793 /* ANSI specifies that a tentative definition which is not merged with
3794 a non-tentative definition behaves exactly like a definition with an
3795 initializer equal to zero. (Section 3.7.2)
3796 -fno-common gives strict ANSI behavior. Usually you don't want it.
3797 This matters only for variables with external linkage. */
3798 if (! flag_no_common || ! TREE_PUBLIC (decl))
3799 DECL_COMMON (decl) = 1;
3801 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3802 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3805 /* Set attributes here so if duplicate decl, will have proper attributes. */
3806 decl_attributes (decl, attributes, prefix_attributes);
3808 /* Add this decl to the current binding level.
3809 TEM may equal DECL or it may be a previous decl of the same name. */
3810 tem = pushdecl (decl);
3812 /* For a local variable, define the RTL now. */
3813 if (current_binding_level != global_binding_level
3814 /* But not if this is a duplicate decl
3815 and we preserved the rtl from the previous one
3816 (which may or may not happen). */
3817 && DECL_RTL (tem) == 0)
3819 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3821 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3822 && DECL_INITIAL (tem) != 0)
3828 /* When parsing and digesting the initializer,
3829 use temporary storage. Do this even if we will ignore the value. */
3830 if (current_binding_level == global_binding_level && debug_temp_inits)
3831 temporary_allocation ();
3837 /* Finish processing of a declaration;
3838 install its initial value.
3839 If the length of an array type is not known before,
3840 it must be determined now, from the initial value, or it is an error. */
3843 finish_decl (decl, init, asmspec_tree)
3847 register tree type = TREE_TYPE (decl);
3848 int was_incomplete = (DECL_SIZE (decl) == 0);
3849 int temporary = allocation_temporary_p ();
3852 /* If a name was specified, get the string. */
3854 asmspec = TREE_STRING_POINTER (asmspec_tree);
3856 /* If `start_decl' didn't like having an initialization, ignore it now. */
3858 if (init != 0 && DECL_INITIAL (decl) == 0)
3860 /* Don't crash if parm is initialized. */
3861 if (TREE_CODE (decl) == PARM_DECL)
3864 if (ITERATOR_P (decl))
3867 error_with_decl (decl, "iterator has no initial value");
3869 init = save_expr (init);
3874 if (TREE_CODE (decl) != TYPE_DECL)
3875 store_init_value (decl, init);
3878 /* typedef foo = bar; store the type of bar as the type of foo. */
3879 TREE_TYPE (decl) = TREE_TYPE (init);
3880 DECL_INITIAL (decl) = init = 0;
3884 /* Pop back to the obstack that is current for this binding level.
3885 This is because MAXINDEX, rtl, etc. to be made below
3886 must go in the permanent obstack. But don't discard the
3887 temporary data yet. */
3889 #if 0 /* pop_obstacks was near the end; this is what was here. */
3890 if (current_binding_level == global_binding_level && temporary)
3891 end_temporary_allocation ();
3894 /* Deduce size of array from initialization, if not already known */
3896 if (TREE_CODE (type) == ARRAY_TYPE
3897 && TYPE_DOMAIN (type) == 0
3898 && TREE_CODE (decl) != TYPE_DECL)
3901 = (TREE_STATIC (decl)
3902 /* Even if pedantic, an external linkage array
3903 may have incomplete type at first. */
3904 ? pedantic && !TREE_PUBLIC (decl)
3905 : !DECL_EXTERNAL (decl));
3907 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3909 /* Get the completed type made by complete_array_type. */
3910 type = TREE_TYPE (decl);
3913 error_with_decl (decl, "initializer fails to determine size of `%s'");
3918 error_with_decl (decl, "array size missing in `%s'");
3919 /* If a `static' var's size isn't known,
3920 make it extern as well as static, so it does not get
3922 If it is not `static', then do not mark extern;
3923 finish_incomplete_decl will give it a default size
3924 and it will get allocated. */
3925 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3926 DECL_EXTERNAL (decl) = 1;
3929 /* TYPE_MAX_VALUE is always one less than the number of elements
3930 in the array, because we start counting at zero. Therefore,
3931 warn only if the value is less than zero. */
3932 if (pedantic && TYPE_DOMAIN (type) != 0
3933 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3934 error_with_decl (decl, "zero or negative size array `%s'");
3936 layout_decl (decl, 0);
3939 if (TREE_CODE (decl) == VAR_DECL)
3941 if (DECL_SIZE (decl) == 0
3942 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3943 layout_decl (decl, 0);
3945 if (DECL_SIZE (decl) == 0
3946 && (TREE_STATIC (decl)
3948 /* A static variable with an incomplete type
3949 is an error if it is initialized.
3950 Also if it is not file scope.
3951 Otherwise, let it through, but if it is not `extern'
3952 then it may cause an error message later. */
3953 /* A duplicate_decls call could have changed an extern
3954 declaration into a file scope one. This can be detected
3955 by TREE_ASM_WRITTEN being set. */
3956 (DECL_INITIAL (decl) != 0
3957 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3959 /* An automatic variable with an incomplete type
3961 !DECL_EXTERNAL (decl)))
3963 error_with_decl (decl, "storage size of `%s' isn't known");
3964 TREE_TYPE (decl) = error_mark_node;
3967 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3968 && DECL_SIZE (decl) != 0)
3970 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3971 constant_expression_warning (DECL_SIZE (decl));
3973 error_with_decl (decl, "storage size of `%s' isn't constant");
3976 if (TREE_USED (type))
3977 TREE_USED (decl) = 1;
3980 /* If this is a function and an assembler name is specified, it isn't
3981 builtin any more. Also reset DECL_RTL so we can give it its new
3983 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3985 DECL_BUILT_IN (decl) = 0;
3986 DECL_RTL (decl) = 0;
3989 /* Output the assembler code and/or RTL code for variables and functions,
3990 unless the type is an undefined structure or union.
3991 If not, it will get done when the type is completed. */
3993 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3995 if ((flag_traditional || TREE_PERMANENT (decl))
3996 && allocation_temporary_p ())
3998 push_obstacks_nochange ();
3999 end_temporary_allocation ();
4000 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4001 maybe_objc_check_decl (decl);
4002 rest_of_decl_compilation (decl, asmspec,
4003 (DECL_CONTEXT (decl) == 0
4004 || TREE_ASM_WRITTEN (decl)),
4010 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4011 maybe_objc_check_decl (decl);
4012 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4015 if (DECL_CONTEXT (decl) != 0)
4017 /* Recompute the RTL of a local array now
4018 if it used to be an incomplete type. */
4020 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4022 /* If we used it already as memory, it must stay in memory. */
4023 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4024 /* If it's still incomplete now, no init will save it. */
4025 if (DECL_SIZE (decl) == 0)
4026 DECL_INITIAL (decl) = 0;
4029 /* Compute and store the initial value. */
4030 if (TREE_CODE (decl) != FUNCTION_DECL)
4031 expand_decl_init (decl);
4035 if (TREE_CODE (decl) == TYPE_DECL)
4037 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4038 maybe_objc_check_decl (decl);
4039 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4043 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4044 /* This test used to include TREE_PERMANENT, however, we have the same
4045 problem with initializers at the function level. Such initializers get
4046 saved until the end of the function on the momentary_obstack. */
4047 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4049 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4050 space with DECL_ARG_TYPE. */
4051 && TREE_CODE (decl) != PARM_DECL)
4053 /* We need to remember that this array HAD an initialization,
4054 but discard the actual temporary nodes,
4055 since we can't have a permanent node keep pointing to them. */
4056 /* We make an exception for inline functions, since it's
4057 normal for a local extern redeclaration of an inline function
4058 to have a copy of the top-level decl's DECL_INLINE. */
4059 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4061 /* If this is a const variable, then preserve the
4062 initializer instead of discarding it so that we can optimize
4063 references to it. */
4064 /* This test used to include TREE_STATIC, but this won't be set
4065 for function level initializers. */
4066 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4068 preserve_initializer ();
4069 /* Hack? Set the permanent bit for something that is permanent,
4070 but not on the permanent obstack, so as to convince
4071 output_constant_def to make its rtl on the permanent
4073 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4075 /* The initializer and DECL must have the same (or equivalent
4076 types), but if the initializer is a STRING_CST, its type
4077 might not be on the right obstack, so copy the type
4079 TREE_TYPE (DECL_INITIAL (decl)) = type;
4082 DECL_INITIAL (decl) = error_mark_node;
4086 /* If requested, warn about definitions of large data objects. */
4088 if (warn_larger_than
4089 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4090 && !DECL_EXTERNAL (decl))
4092 register tree decl_size = DECL_SIZE (decl);
4094 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4096 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4098 if (units > larger_than_size)
4099 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4104 /* Resume permanent allocation, if not within a function. */
4105 /* The corresponding push_obstacks_nochange is in start_decl,
4106 and in push_parm_decl and in grokfield. */
4110 /* If we have gone back from temporary to permanent allocation,
4111 actually free the temporary space that we no longer need. */
4112 if (temporary && !allocation_temporary_p ())
4113 permanent_allocation (0);
4115 /* At the end of a declaration, throw away any variable type sizes
4116 of types defined inside that declaration. There is no use
4117 computing them in the following function definition. */
4118 if (current_binding_level == global_binding_level)
4119 get_pending_sizes ();
4122 /* If DECL has a cleanup, build and return that cleanup here.
4123 This is a callback called by expand_expr. */
4126 maybe_build_cleanup (decl)
4127 tree decl ATTRIBUTE_UNUSED;
4129 /* There are no cleanups in C. */
4133 /* Given a parsed parameter declaration,
4134 decode it into a PARM_DECL and push that on the current binding level.
4135 Also, for the sake of forward parm decls,
4136 record the given order of parms in `parm_order'. */
4139 push_parm_decl (parm)
4143 int old_immediate_size_expand = immediate_size_expand;
4144 /* Don't try computing parm sizes now -- wait till fn is called. */
4145 immediate_size_expand = 0;
4147 /* The corresponding pop_obstacks is in finish_decl. */
4148 push_obstacks_nochange ();
4150 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4151 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4152 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4153 TREE_PURPOSE (TREE_VALUE (parm)));
4156 if (DECL_NAME (decl))
4159 olddecl = lookup_name (DECL_NAME (decl));
4160 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4161 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4165 decl = pushdecl (decl);
4167 immediate_size_expand = old_immediate_size_expand;
4169 current_binding_level->parm_order
4170 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4172 /* Add this decl to the current binding level. */
4173 finish_decl (decl, NULL_TREE, NULL_TREE);
4176 /* Clear the given order of parms in `parm_order'.
4177 Used at start of parm list,
4178 and also at semicolon terminating forward decls. */
4183 current_binding_level->parm_order = NULL_TREE;
4186 /* Make TYPE a complete type based on INITIAL_VALUE.
4187 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4188 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4191 complete_array_type (type, initial_value, do_default)
4196 register tree maxindex = NULL_TREE;
4201 /* Note MAXINDEX is really the maximum index,
4202 one less than the size. */
4203 if (TREE_CODE (initial_value) == STRING_CST)
4206 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4207 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4210 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4212 tree elts = CONSTRUCTOR_ELTS (initial_value);
4213 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4214 for (; elts; elts = TREE_CHAIN (elts))
4216 if (TREE_PURPOSE (elts))
4217 maxindex = TREE_PURPOSE (elts);
4219 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4221 maxindex = copy_node (maxindex);
4225 /* Make an error message unless that happened already. */
4226 if (initial_value != error_mark_node)
4229 /* Prevent further error messages. */
4230 maxindex = build_int_2 (0, 0);
4237 maxindex = build_int_2 (0, 0);
4243 TYPE_DOMAIN (type) = build_index_type (maxindex);
4244 if (!TREE_TYPE (maxindex))
4245 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4248 /* Lay out the type now that we can get the real answer. */
4255 /* Given declspecs and a declarator,
4256 determine the name and type of the object declared
4257 and construct a ..._DECL node for it.
4258 (In one case we can return a ..._TYPE node instead.
4259 For invalid input we sometimes return 0.)
4261 DECLSPECS is a chain of tree_list nodes whose value fields
4262 are the storage classes and type specifiers.
4264 DECL_CONTEXT says which syntactic context this declaration is in:
4265 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4266 FUNCDEF for a function definition. Like NORMAL but a few different
4267 error messages in each case. Return value may be zero meaning
4268 this definition is too screwy to try to parse.
4269 PARM for a parameter declaration (either within a function prototype
4270 or before a function body). Make a PARM_DECL, or return void_type_node.
4271 TYPENAME if for a typename (in a cast or sizeof).
4272 Don't make a DECL node; just return the ..._TYPE node.
4273 FIELD for a struct or union field; make a FIELD_DECL.
4274 BITFIELD for a field with specified width.
4275 INITIALIZED is 1 if the decl has an initializer.
4277 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4278 It may also be so in the PARM case, for a prototype where the
4279 argument type is specified but not the name.
4281 This function is where the complicated C meanings of `static'
4282 and `extern' are interpreted. */
4285 grokdeclarator (declarator, declspecs, decl_context, initialized)
4288 enum decl_context decl_context;
4293 tree type = NULL_TREE;
4298 int explicit_int = 0;
4299 int explicit_char = 0;
4300 int defaulted_int = 0;
4301 tree typedef_decl = 0;
4303 tree typedef_type = 0;
4304 int funcdef_flag = 0;
4305 enum tree_code innermost_code = ERROR_MARK;
4307 int size_varies = 0;
4308 tree decl_machine_attr = NULL_TREE;
4310 if (decl_context == BITFIELD)
4311 bitfield = 1, decl_context = FIELD;
4313 if (decl_context == FUNCDEF)
4314 funcdef_flag = 1, decl_context = NORMAL;
4316 push_obstacks_nochange ();
4318 if (flag_traditional && allocation_temporary_p ())
4319 end_temporary_allocation ();
4321 /* Look inside a declarator for the name being declared
4322 and get it as a string, for an error message. */
4324 register tree decl = declarator;
4328 switch (TREE_CODE (decl))
4333 innermost_code = TREE_CODE (decl);
4334 decl = TREE_OPERAND (decl, 0);
4337 case IDENTIFIER_NODE:
4338 name = IDENTIFIER_POINTER (decl);
4349 /* A function definition's declarator must have the form of
4350 a function declarator. */
4352 if (funcdef_flag && innermost_code != CALL_EXPR)
4355 /* Anything declared one level down from the top level
4356 must be one of the parameters of a function
4357 (because the body is at least two levels down). */
4359 /* If this looks like a function definition, make it one,
4360 even if it occurs where parms are expected.
4361 Then store_parm_decls will reject it and not use it as a parm. */
4362 if (decl_context == NORMAL && !funcdef_flag
4363 && current_binding_level->parm_flag)
4364 decl_context = PARM;
4366 /* Look through the decl specs and record which ones appear.
4367 Some typespecs are defined as built-in typenames.
4368 Others, the ones that are modifiers of other types,
4369 are represented by bits in SPECBITS: set the bits for
4370 the modifiers that appear. Storage class keywords are also in SPECBITS.
4372 If there is a typedef name or a type, store the type in TYPE.
4373 This includes builtin typedefs such as `int'.
4375 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4376 and did not come from a user typedef.
4378 Set LONGLONG if `long' is mentioned twice. */
4380 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4383 register tree id = TREE_VALUE (spec);
4385 if (id == ridpointers[(int) RID_INT])
4387 if (id == ridpointers[(int) RID_CHAR])
4390 if (TREE_CODE (id) == IDENTIFIER_NODE)
4391 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4393 if (ridpointers[i] == id)
4395 if (i == (int) RID_LONG && specbits & (1<<i))
4398 error ("`long long long' is too long for GCC");
4401 if (pedantic && ! in_system_header)
4402 pedwarn ("ANSI C does not support `long long'");
4406 else if (specbits & (1 << i))
4407 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4413 error ("two or more data types in declaration of `%s'", name);
4414 /* Actual typedefs come to us as TYPE_DECL nodes. */
4415 else if (TREE_CODE (id) == TYPE_DECL)
4417 type = TREE_TYPE (id);
4418 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4421 /* Built-in types come as identifiers. */
4422 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4424 register tree t = lookup_name (id);
4425 if (TREE_TYPE (t) == error_mark_node)
4427 else if (!t || TREE_CODE (t) != TYPE_DECL)
4428 error ("`%s' fails to be a typedef or built in type",
4429 IDENTIFIER_POINTER (id));
4432 type = TREE_TYPE (t);
4436 else if (TREE_CODE (id) != ERROR_MARK)
4442 typedef_type = type;
4444 size_varies = C_TYPE_VARIABLE_SIZE (type);
4446 /* No type at all: default to `int', and set DEFAULTED_INT
4447 because it was not a user-defined typedef. */
4451 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4452 | (1 << (int) RID_SIGNED)
4453 | (1 << (int) RID_UNSIGNED))))
4454 && ! (in_system_header && ! allocation_temporary_p ()))
4456 /* C9x will probably require a diagnostic here.
4457 For now, issue a warning if -Wreturn-type and this is a function,
4458 or if -Wimplicit; prefer the former warning since it is more
4460 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4461 warn_about_return_type = 1;
4462 else if (warn_implicit_int)
4463 warning ("type defaults to `int' in declaration of `%s'", name);
4467 type = integer_type_node;
4470 /* Now process the modifiers that were specified
4471 and check for invalid combinations. */
4473 /* Long double is a special combination. */
4475 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4476 && TYPE_MAIN_VARIANT (type) == double_type_node)
4478 specbits &= ~ (1 << (int) RID_LONG);
4479 type = long_double_type_node;
4482 /* Check all other uses of type modifiers. */
4484 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4485 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4489 if ((specbits & 1 << (int) RID_LONG)
4490 && (specbits & 1 << (int) RID_SHORT))
4491 error ("both long and short specified for `%s'", name);
4492 else if (((specbits & 1 << (int) RID_LONG)
4493 || (specbits & 1 << (int) RID_SHORT))
4495 error ("long or short specified with char for `%s'", name);
4496 else if (((specbits & 1 << (int) RID_LONG)
4497 || (specbits & 1 << (int) RID_SHORT))
4498 && TREE_CODE (type) == REAL_TYPE)
4500 static int already = 0;
4502 error ("long or short specified with floating type for `%s'", name);
4503 if (! already && ! pedantic)
4505 error ("the only valid combination is `long double'");
4509 else if ((specbits & 1 << (int) RID_SIGNED)
4510 && (specbits & 1 << (int) RID_UNSIGNED))
4511 error ("both signed and unsigned specified for `%s'", name);
4512 else if (TREE_CODE (type) != INTEGER_TYPE)
4513 error ("long, short, signed or unsigned invalid for `%s'", name);
4517 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4519 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4521 if (flag_pedantic_errors)
4526 /* Discard the type modifiers if they are invalid. */
4529 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4530 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4535 if ((specbits & (1 << (int) RID_COMPLEX))
4536 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4538 error ("complex invalid for `%s'", name);
4539 specbits &= ~ (1 << (int) RID_COMPLEX);
4542 /* Decide whether an integer type is signed or not.
4543 Optionally treat bitfields as signed by default. */
4544 if (specbits & 1 << (int) RID_UNSIGNED
4545 /* Traditionally, all bitfields are unsigned. */
4546 || (bitfield && flag_traditional
4547 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4548 || (bitfield && ! flag_signed_bitfields
4549 && (explicit_int || defaulted_int || explicit_char
4550 /* A typedef for plain `int' without `signed'
4551 can be controlled just like plain `int'. */
4552 || ! (typedef_decl != 0
4553 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4554 && TREE_CODE (type) != ENUMERAL_TYPE
4555 && !(specbits & 1 << (int) RID_SIGNED)))
4558 type = long_long_unsigned_type_node;
4559 else if (specbits & 1 << (int) RID_LONG)
4560 type = long_unsigned_type_node;
4561 else if (specbits & 1 << (int) RID_SHORT)
4562 type = short_unsigned_type_node;
4563 else if (type == char_type_node)
4564 type = unsigned_char_type_node;
4565 else if (typedef_decl)
4566 type = unsigned_type (type);
4568 type = unsigned_type_node;
4570 else if ((specbits & 1 << (int) RID_SIGNED)
4571 && type == char_type_node)
4572 type = signed_char_type_node;
4574 type = long_long_integer_type_node;
4575 else if (specbits & 1 << (int) RID_LONG)
4576 type = long_integer_type_node;
4577 else if (specbits & 1 << (int) RID_SHORT)
4578 type = short_integer_type_node;
4580 if (specbits & 1 << (int) RID_COMPLEX)
4582 /* If we just have "complex", it is equivalent to
4583 "complex double", but if any modifiers at all are specified it is
4584 the complex form of TYPE. E.g, "complex short" is
4585 "complex short int". */
4587 if (defaulted_int && ! longlong
4588 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4589 | (1 << (int) RID_SIGNED)
4590 | (1 << (int) RID_UNSIGNED))))
4591 type = complex_double_type_node;
4592 else if (type == integer_type_node)
4593 type = complex_integer_type_node;
4594 else if (type == float_type_node)
4595 type = complex_float_type_node;
4596 else if (type == double_type_node)
4597 type = complex_double_type_node;
4598 else if (type == long_double_type_node)
4599 type = complex_long_double_type_node;
4601 type = build_complex_type (type);
4604 /* Set CONSTP if this declaration is `const', whether by
4605 explicit specification or via a typedef.
4606 Likewise for VOLATILEP. */
4608 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4609 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4610 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4612 pedwarn ("duplicate `const'");
4614 pedwarn ("duplicate `volatile'");
4615 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4616 type = TYPE_MAIN_VARIANT (type);
4618 /* Warn if two storage classes are given. Default to `auto'. */
4623 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4624 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4625 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4626 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4627 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4628 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4630 /* Warn about storage classes that are invalid for certain
4631 kinds of declarations (parameters, typenames, etc.). */
4634 error ("multiple storage classes in declaration of `%s'", name);
4635 else if (funcdef_flag
4637 & ((1 << (int) RID_REGISTER)
4638 | (1 << (int) RID_AUTO)
4639 | (1 << (int) RID_TYPEDEF))))
4641 if (specbits & 1 << (int) RID_AUTO
4642 && (pedantic || current_binding_level == global_binding_level))
4643 pedwarn ("function definition declared `auto'");
4644 if (specbits & 1 << (int) RID_REGISTER)
4645 error ("function definition declared `register'");
4646 if (specbits & 1 << (int) RID_TYPEDEF)
4647 error ("function definition declared `typedef'");
4648 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4649 | (1 << (int) RID_AUTO));
4651 else if (decl_context != NORMAL && nclasses > 0)
4653 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4657 error ((decl_context == FIELD
4658 ? "storage class specified for structure field `%s'"
4659 : (decl_context == PARM
4660 ? "storage class specified for parameter `%s'"
4661 : "storage class specified for typename")),
4663 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4664 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4665 | (1 << (int) RID_EXTERN));
4668 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4670 /* `extern' with initialization is invalid if not at top level. */
4671 if (current_binding_level == global_binding_level)
4672 warning ("`%s' initialized and declared `extern'", name);
4674 error ("`%s' has both `extern' and initializer", name);
4676 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4677 && current_binding_level != global_binding_level)
4678 error ("nested function `%s' declared `extern'", name);
4679 else if (current_binding_level == global_binding_level
4680 && specbits & (1 << (int) RID_AUTO))
4681 error ("top-level declaration of `%s' specifies `auto'", name);
4682 else if ((specbits & 1 << (int) RID_ITERATOR)
4683 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4685 error ("iterator `%s' has derived type", name);
4686 type = error_mark_node;
4688 else if ((specbits & 1 << (int) RID_ITERATOR)
4689 && TREE_CODE (type) != INTEGER_TYPE)
4691 error ("iterator `%s' has noninteger type", name);
4692 type = error_mark_node;
4696 /* Now figure out the structure of the declarator proper.
4697 Descend through it, creating more complex types, until we reach
4698 the declared identifier (or NULL_TREE, in an absolute declarator). */
4700 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4702 if (type == error_mark_node)
4704 declarator = TREE_OPERAND (declarator, 0);
4708 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4709 an INDIRECT_REF (for *...),
4710 a CALL_EXPR (for ...(...)),
4711 an identifier (for the name being declared)
4712 or a null pointer (for the place in an absolute declarator
4713 where the name was omitted).
4714 For the last two cases, we have just exited the loop.
4716 At this point, TYPE is the type of elements of an array,
4717 or for a function to return, or for a pointer to point to.
4718 After this sequence of ifs, TYPE is the type of the
4719 array or function or pointer, and DECLARATOR has had its
4720 outermost layer removed. */
4722 if (TREE_CODE (declarator) == ARRAY_REF)
4724 register tree itype = NULL_TREE;
4725 register tree size = TREE_OPERAND (declarator, 1);
4726 /* An uninitialized decl with `extern' is a reference. */
4727 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4728 /* The index is a signed object `sizetype' bits wide. */
4729 tree index_type = signed_type (sizetype);
4731 declarator = TREE_OPERAND (declarator, 0);
4733 /* Check for some types that there cannot be arrays of. */
4735 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4737 error ("declaration of `%s' as array of voids", name);
4738 type = error_mark_node;
4741 if (TREE_CODE (type) == FUNCTION_TYPE)
4743 error ("declaration of `%s' as array of functions", name);
4744 type = error_mark_node;
4747 if (size == error_mark_node)
4748 type = error_mark_node;
4750 if (type == error_mark_node)
4753 /* If this is a block level extern, it must live past the end
4754 of the function so that we can check it against other extern
4755 declarations (IDENTIFIER_LIMBO_VALUE). */
4756 if (extern_ref && allocation_temporary_p ())
4757 end_temporary_allocation ();
4759 /* If size was specified, set ITYPE to a range-type for that size.
4760 Otherwise, ITYPE remains null. finish_decl may figure it out
4761 from an initial value. */
4765 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4766 STRIP_TYPE_NOPS (size);
4768 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4769 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4771 error ("size of array `%s' has non-integer type", name);
4772 size = integer_one_node;
4775 if (pedantic && integer_zerop (size))
4776 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4778 if (TREE_CODE (size) == INTEGER_CST)
4780 constant_expression_warning (size);
4781 if (tree_int_cst_sgn (size) < 0)
4783 error ("size of array `%s' is negative", name);
4784 size = integer_one_node;
4789 /* Make sure the array size remains visibly nonconstant
4790 even if it is (eg) a const variable with known value. */
4795 if (TREE_CONSTANT (size))
4796 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4798 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4802 /* Convert size to index_type, so that if it is a variable
4803 the computations will be done in the proper mode. */
4804 itype = fold (build (MINUS_EXPR, index_type,
4805 convert (index_type, size),
4806 convert (index_type, size_one_node)));
4808 /* If that overflowed, the array is too big.
4809 ??? While a size of INT_MAX+1 technically shouldn't cause
4810 an overflow (because we subtract 1), the overflow is recorded
4811 during the conversion to index_type, before the subtraction.
4812 Handling this case seems like an unnecessary complication. */
4813 if (TREE_OVERFLOW (itype))
4815 error ("size of array `%s' is too large", name);
4816 type = error_mark_node;
4821 itype = variable_size (itype);
4822 itype = build_index_type (itype);
4825 #if 0 /* This had bad results for pointers to arrays, as in
4826 union incomplete (*foo)[4]; */
4827 /* Complain about arrays of incomplete types, except in typedefs. */
4829 if (TYPE_SIZE (type) == 0
4830 /* Avoid multiple warnings for nested array types. */
4831 && TREE_CODE (type) != ARRAY_TYPE
4832 && !(specbits & (1 << (int) RID_TYPEDEF))
4833 && !C_TYPE_BEING_DEFINED (type))
4834 warning ("array type has incomplete element type");
4837 #if 0 /* We shouldn't have a function type here at all!
4838 Functions aren't allowed as array elements. */
4839 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4840 && (constp || volatilep))
4841 pedwarn ("ANSI C forbids const or volatile function types");
4844 /* Build the array type itself, then merge any constancy or
4845 volatility into the target type. We must do it in this order
4846 to ensure that the TYPE_MAIN_VARIANT field of the array type
4847 is set correctly. */
4849 type = build_array_type (type, itype);
4850 if (constp || volatilep)
4851 type = c_build_type_variant (type, constp, volatilep);
4853 #if 0 /* don't clear these; leave them set so that the array type
4854 or the variable is itself const or volatile. */
4860 C_TYPE_VARIABLE_SIZE (type) = 1;
4862 else if (TREE_CODE (declarator) == CALL_EXPR)
4864 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4865 || current_binding_level == global_binding_level);
4868 /* Declaring a function type.
4869 Make sure we have a valid type for the function to return. */
4870 if (type == error_mark_node)
4875 /* Warn about some types functions can't return. */
4877 if (TREE_CODE (type) == FUNCTION_TYPE)
4879 error ("`%s' declared as function returning a function", name);
4880 type = integer_type_node;
4882 if (TREE_CODE (type) == ARRAY_TYPE)
4884 error ("`%s' declared as function returning an array", name);
4885 type = integer_type_node;
4888 #ifndef TRADITIONAL_RETURN_FLOAT
4889 /* Traditionally, declaring return type float means double. */
4891 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4892 type = double_type_node;
4893 #endif /* TRADITIONAL_RETURN_FLOAT */
4895 /* If this is a block level extern, it must live past the end
4896 of the function so that we can check it against other extern
4897 declarations (IDENTIFIER_LIMBO_VALUE). */
4898 if (extern_ref && allocation_temporary_p ())
4899 end_temporary_allocation ();
4901 /* Construct the function type and go to the next
4902 inner layer of declarator. */
4904 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4906 /* Say it's a definition
4907 only for the CALL_EXPR
4908 closest to the identifier. */
4909 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4910 #if 0 /* This seems to be false. We turn off temporary allocation
4911 above in this function if -traditional.
4912 And this code caused inconsistent results with prototypes:
4913 callers would ignore them, and pass arguments wrong. */
4915 /* Omit the arg types if -traditional, since the arg types
4916 and the list links might not be permanent. */
4917 type = build_function_type (type,
4919 ? NULL_TREE : arg_types);
4921 /* ANSI seems to say that `const int foo ();'
4922 does not make the function foo const. */
4923 if (constp || volatilep)
4924 type = c_build_type_variant (type, constp, volatilep);
4928 type = build_function_type (type, arg_types);
4929 declarator = TREE_OPERAND (declarator, 0);
4931 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4932 the formal parameter list of this FUNCTION_TYPE to point to
4933 the FUNCTION_TYPE node itself. */
4938 for (link = last_function_parm_tags;
4940 link = TREE_CHAIN (link))
4941 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4944 else if (TREE_CODE (declarator) == INDIRECT_REF)
4946 /* Merge any constancy or volatility into the target type
4949 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4950 && (constp || volatilep))
4951 pedwarn ("ANSI C forbids const or volatile function types");
4952 if (constp || volatilep)
4953 type = c_build_type_variant (type, constp, volatilep);
4958 type = build_pointer_type (type);
4960 /* Process a list of type modifier keywords
4961 (such as const or volatile) that were given inside the `*'. */
4963 if (TREE_TYPE (declarator))
4965 register tree typemodlist;
4967 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4968 typemodlist = TREE_CHAIN (typemodlist))
4970 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4972 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4977 error ("invalid type modifier within pointer declarator");
4981 pedwarn ("duplicate `const'");
4983 pedwarn ("duplicate `volatile'");
4986 declarator = TREE_OPERAND (declarator, 0);
4993 /* Now TYPE has the actual type. */
4995 /* Did array size calculations overflow? */
4997 if (TREE_CODE (type) == ARRAY_TYPE
4999 && TREE_OVERFLOW (TYPE_SIZE (type)))
5000 error ("size of array `%s' is too large", name);
5002 /* If this is declaring a typedef name, return a TYPE_DECL. */
5004 if (specbits & (1 << (int) RID_TYPEDEF))
5007 /* Note that the grammar rejects storage classes
5008 in typenames, fields or parameters */
5009 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5010 && (constp || volatilep))
5011 pedwarn ("ANSI C forbids const or volatile function types");
5012 if (constp || volatilep)
5013 type = c_build_type_variant (type, constp, volatilep);
5014 decl = build_decl (TYPE_DECL, declarator, type);
5015 if ((specbits & (1 << (int) RID_SIGNED))
5016 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5017 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5022 /* Detect the case of an array type of unspecified size
5023 which came, as such, direct from a typedef name.
5024 We must copy the type, so that each identifier gets
5025 a distinct type, so that each identifier's size can be
5026 controlled separately by its own initializer. */
5028 if (type != 0 && typedef_type != 0
5029 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5030 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5032 type = build_array_type (TREE_TYPE (type), 0);
5034 C_TYPE_VARIABLE_SIZE (type) = 1;
5037 /* If this is a type name (such as, in a cast or sizeof),
5038 compute the type and return it now. */
5040 if (decl_context == TYPENAME)
5042 /* Note that the grammar rejects storage classes
5043 in typenames, fields or parameters */
5044 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5045 && (constp || volatilep))
5046 pedwarn ("ANSI C forbids const or volatile function types");
5047 if (constp || volatilep)
5048 type = c_build_type_variant (type, constp, volatilep);
5053 /* Aside from typedefs and type names (handle above),
5054 `void' at top level (not within pointer)
5055 is allowed only in public variables.
5056 We don't complain about parms either, but that is because
5057 a better error message can be made later. */
5059 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5060 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5061 && ((specbits & (1 << (int) RID_EXTERN))
5062 || (current_binding_level == global_binding_level
5064 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5066 error ("variable or field `%s' declared void", name);
5067 type = integer_type_node;
5070 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5071 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5076 if (decl_context == PARM)
5078 tree type_as_written = type;
5081 /* A parameter declared as an array of T is really a pointer to T.
5082 One declared as a function is really a pointer to a function. */
5084 if (TREE_CODE (type) == ARRAY_TYPE)
5086 /* Transfer const-ness of array into that of type pointed to. */
5087 type = TREE_TYPE (type);
5088 if (constp || volatilep)
5089 type = c_build_type_variant (type, constp, volatilep);
5090 type = build_pointer_type (type);
5091 volatilep = constp = 0;
5094 else if (TREE_CODE (type) == FUNCTION_TYPE)
5096 if (pedantic && (constp || volatilep))
5097 pedwarn ("ANSI C forbids const or volatile function types");
5098 if (constp || volatilep)
5099 type = c_build_type_variant (type, constp, volatilep);
5100 type = build_pointer_type (type);
5101 volatilep = constp = 0;
5104 decl = build_decl (PARM_DECL, declarator, type);
5106 C_DECL_VARIABLE_SIZE (decl) = 1;
5108 /* Compute the type actually passed in the parmlist,
5109 for the case where there is no prototype.
5110 (For example, shorts and chars are passed as ints.)
5111 When there is a prototype, this is overridden later. */
5113 DECL_ARG_TYPE (decl) = type;
5114 main_type = (type == error_mark_node
5116 : TYPE_MAIN_VARIANT (type));
5117 if (main_type == float_type_node)
5118 DECL_ARG_TYPE (decl) = double_type_node;
5119 /* Don't use TYPE_PRECISION to decide whether to promote,
5120 because we should convert short if it's the same size as int,
5121 but we should not convert long if it's the same size as int. */
5122 else if (TREE_CODE (main_type) != ERROR_MARK
5123 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5125 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5126 && TREE_UNSIGNED (type))
5127 DECL_ARG_TYPE (decl) = unsigned_type_node;
5129 DECL_ARG_TYPE (decl) = integer_type_node;
5132 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5134 else if (decl_context == FIELD)
5136 /* Structure field. It may not be a function. */
5138 if (TREE_CODE (type) == FUNCTION_TYPE)
5140 error ("field `%s' declared as a function", name);
5141 type = build_pointer_type (type);
5143 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5145 error ("field `%s' has incomplete type", name);
5146 type = error_mark_node;
5148 /* Move type qualifiers down to element of an array. */
5149 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5151 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5153 TYPE_DOMAIN (type));
5154 #if 0 /* Leave the field const or volatile as well. */
5155 constp = volatilep = 0;
5158 decl = build_decl (FIELD_DECL, declarator, type);
5160 C_DECL_VARIABLE_SIZE (decl) = 1;
5162 else if (TREE_CODE (type) == FUNCTION_TYPE)
5164 /* Every function declaration is "external"
5165 except for those which are inside a function body
5166 in which `auto' is used.
5167 That is a case not specified by ANSI C,
5168 and we use it for forward declarations for nested functions. */
5169 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5170 || current_binding_level == global_binding_level);
5172 if (specbits & (1 << (int) RID_AUTO)
5173 && (pedantic || current_binding_level == global_binding_level))
5174 pedwarn ("invalid storage class for function `%s'", name);
5175 if (specbits & (1 << (int) RID_REGISTER))
5176 error ("invalid storage class for function `%s'", name);
5177 /* Function declaration not at top level.
5178 Storage classes other than `extern' are not allowed
5179 and `extern' makes no difference. */
5180 if (current_binding_level != global_binding_level
5181 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5183 pedwarn ("invalid storage class for function `%s'", name);
5185 /* If this is a block level extern, it must live past the end
5186 of the function so that we can check it against other
5187 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5188 if (extern_ref && allocation_temporary_p ())
5189 end_temporary_allocation ();
5191 decl = build_decl (FUNCTION_DECL, declarator, type);
5192 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5194 if (pedantic && (constp || volatilep)
5195 && ! DECL_IN_SYSTEM_HEADER (decl))
5196 pedwarn ("ANSI C forbids const or volatile functions");
5199 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5200 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5201 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5202 && ! DECL_IN_SYSTEM_HEADER (decl))
5203 pedwarn ("ANSI C forbids const or volatile void function return type");
5206 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5207 warning ("`noreturn' function returns non-void value");
5210 DECL_EXTERNAL (decl) = 1;
5211 /* Record absence of global scope for `static' or `auto'. */
5213 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5215 /* Record presence of `inline', if it is reasonable. */
5218 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5219 warning ("cannot inline function `main'");
5221 /* Assume that otherwise the function can be inlined. */
5222 DECL_INLINE (decl) = 1;
5224 if (specbits & (1 << (int) RID_EXTERN))
5225 current_extern_inline = 1;
5230 /* It's a variable. */
5231 /* An uninitialized decl with `extern' is a reference. */
5232 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5234 /* Move type qualifiers down to element of an array. */
5235 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5237 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5239 TYPE_DOMAIN (type));
5240 #if 0 /* Leave the variable const or volatile as well. */
5241 constp = volatilep = 0;
5245 /* If this is a block level extern, it must live past the end
5246 of the function so that we can check it against other
5247 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5248 if (extern_ref && allocation_temporary_p ())
5249 end_temporary_allocation ();
5251 decl = build_decl (VAR_DECL, declarator, type);
5253 C_DECL_VARIABLE_SIZE (decl) = 1;
5256 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5258 DECL_EXTERNAL (decl) = extern_ref;
5259 /* At top level, the presence of a `static' or `register' storage
5260 class specifier, or the absence of all storage class specifiers
5261 makes this declaration a definition (perhaps tentative). Also,
5262 the absence of both `static' and `register' makes it public. */
5263 if (current_binding_level == global_binding_level)
5267 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5268 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5270 /* Not at top level, only `static' makes a static definition. */
5273 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5274 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5277 if (specbits & 1 << (int) RID_ITERATOR)
5278 ITERATOR_P (decl) = 1;
5281 /* Record `register' declaration for warnings on &
5282 and in case doing stupid register allocation. */
5284 if (specbits & (1 << (int) RID_REGISTER))
5285 DECL_REGISTER (decl) = 1;
5287 /* Record constancy and volatility. */
5290 TREE_READONLY (decl) = 1;
5293 TREE_SIDE_EFFECTS (decl) = 1;
5294 TREE_THIS_VOLATILE (decl) = 1;
5296 /* If a type has volatile components, it should be stored in memory.
5297 Otherwise, the fact that those components are volatile
5298 will be ignored, and would even crash the compiler. */
5299 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5300 mark_addressable (decl);
5308 /* Decode the parameter-list info for a function type or function definition.
5309 The argument is the value returned by `get_parm_info' (or made in parse.y
5310 if there is an identifier list instead of a parameter decl list).
5311 These two functions are separate because when a function returns
5312 or receives functions then each is called multiple times but the order
5313 of calls is different. The last call to `grokparms' is always the one
5314 that contains the formal parameter names of a function definition.
5316 Store in `last_function_parms' a chain of the decls of parms.
5317 Also store in `last_function_parm_tags' a chain of the struct, union,
5318 and enum tags declared among the parms.
5320 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5322 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5323 a mere declaration. A nonempty identifier-list gets an error message
5324 when FUNCDEF_FLAG is zero. */
5327 grokparms (parms_info, funcdef_flag)
5331 tree first_parm = TREE_CHAIN (parms_info);
5333 last_function_parms = TREE_PURPOSE (parms_info);
5334 last_function_parm_tags = TREE_VALUE (parms_info);
5336 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5337 && !in_system_header)
5338 warning ("function declaration isn't a prototype");
5341 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5344 pedwarn ("parameter names (without types) in function declaration");
5346 last_function_parms = first_parm;
5353 /* We no longer test FUNCDEF_FLAG.
5354 If the arg types are incomplete in a declaration,
5355 they must include undefined tags.
5356 These tags can never be defined in the scope of the declaration,
5357 so the types can never be completed,
5358 and no call can be compiled successfully. */
5360 /* In a fcn definition, arg types must be complete. */
5363 for (parm = last_function_parms, typelt = first_parm;
5365 parm = TREE_CHAIN (parm))
5366 /* Skip over any enumeration constants declared here. */
5367 if (TREE_CODE (parm) == PARM_DECL)
5369 /* Barf if the parameter itself has an incomplete type. */
5370 tree type = TREE_VALUE (typelt);
5371 if (TYPE_SIZE (type) == 0)
5373 if (funcdef_flag && DECL_NAME (parm) != 0)
5374 error ("parameter `%s' has incomplete type",
5375 IDENTIFIER_POINTER (DECL_NAME (parm)));
5377 warning ("parameter has incomplete type");
5380 TREE_VALUE (typelt) = error_mark_node;
5381 TREE_TYPE (parm) = error_mark_node;
5384 #if 0 /* This has been replaced by parm_tags_warning
5385 which uses a more accurate criterion for what to warn about. */
5388 /* Now warn if is a pointer to an incomplete type. */
5389 while (TREE_CODE (type) == POINTER_TYPE
5390 || TREE_CODE (type) == REFERENCE_TYPE)
5391 type = TREE_TYPE (type);
5392 type = TYPE_MAIN_VARIANT (type);
5393 if (TYPE_SIZE (type) == 0)
5395 if (DECL_NAME (parm) != 0)
5396 warning ("parameter `%s' points to incomplete type",
5397 IDENTIFIER_POINTER (DECL_NAME (parm)));
5399 warning ("parameter points to incomplete type");
5403 typelt = TREE_CHAIN (typelt);
5406 /* Allocate the list of types the way we allocate a type. */
5407 if (first_parm && ! TREE_PERMANENT (first_parm))
5409 /* Construct a copy of the list of types
5410 on the saveable obstack. */
5412 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5413 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5415 return nreverse (result);
5418 /* The list we have is permanent already. */
5424 /* Return a tree_list node with info on a parameter list just parsed.
5425 The TREE_PURPOSE is a chain of decls of those parms.
5426 The TREE_VALUE is a list of structure, union and enum tags defined.
5427 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5428 This tree_list node is later fed to `grokparms'.
5430 VOID_AT_END nonzero means append `void' to the end of the type-list.
5431 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5434 get_parm_info (void_at_end)
5437 register tree decl, t;
5438 register tree types = 0;
5440 tree tags = gettags ();
5441 tree parms = getdecls ();
5443 tree order = current_binding_level->parm_order;
5445 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5446 if (void_at_end && parms != 0
5447 && TREE_CHAIN (parms) == 0
5448 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5449 && DECL_NAME (parms) == 0)
5452 storedecls (NULL_TREE);
5453 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5454 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5457 /* Extract enumerator values and other non-parms declared with the parms.
5458 Likewise any forward parm decls that didn't have real parm decls. */
5459 for (decl = parms; decl; )
5461 tree next = TREE_CHAIN (decl);
5463 if (TREE_CODE (decl) != PARM_DECL)
5465 TREE_CHAIN (decl) = new_parms;
5468 else if (TREE_ASM_WRITTEN (decl))
5470 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5471 TREE_CHAIN (decl) = new_parms;
5477 /* Put the parm decls back in the order they were in in the parm list. */
5478 for (t = order; t; t = TREE_CHAIN (t))
5481 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5483 TREE_CHAIN (TREE_VALUE (t)) = 0;
5486 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5489 /* Store the parmlist in the binding level since the old one
5490 is no longer a valid list. (We have changed the chain pointers.) */
5491 storedecls (new_parms);
5493 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5494 /* There may also be declarations for enumerators if an enumeration
5495 type is declared among the parms. Ignore them here. */
5496 if (TREE_CODE (decl) == PARM_DECL)
5498 /* Since there is a prototype,
5499 args are passed in their declared types. */
5500 tree type = TREE_TYPE (decl);
5501 DECL_ARG_TYPE (decl) = type;
5502 #ifdef PROMOTE_PROTOTYPES
5503 if ((TREE_CODE (type) == INTEGER_TYPE
5504 || TREE_CODE (type) == ENUMERAL_TYPE)
5505 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5506 DECL_ARG_TYPE (decl) = integer_type_node;
5509 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5510 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5511 && DECL_NAME (decl) == 0)
5513 error ("`void' in parameter list must be the entire list");
5519 return saveable_tree_cons (new_parms, tags,
5520 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5522 return saveable_tree_cons (new_parms, tags, nreverse (types));
5525 /* At end of parameter list, warn about any struct, union or enum tags
5526 defined within. Do so because these types cannot ever become complete. */
5529 parmlist_tags_warning ()
5534 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5536 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5537 /* An anonymous union parm type is meaningful as a GNU extension.
5538 So don't warn for that. */
5539 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5541 if (TREE_PURPOSE (elt) != 0)
5542 warning ("`%s %s' declared inside parameter list",
5543 (code == RECORD_TYPE ? "struct"
5544 : code == UNION_TYPE ? "union"
5546 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5548 warning ("anonymous %s declared inside parameter list",
5549 (code == RECORD_TYPE ? "struct"
5550 : code == UNION_TYPE ? "union"
5555 warning ("its scope is only this definition or declaration,");
5556 warning ("which is probably not what you want.");
5562 /* Get the struct, enum or union (CODE says which) with tag NAME.
5563 Define the tag as a forward-reference if it is not defined. */
5566 xref_tag (code, name)
5567 enum tree_code code;
5570 int temporary = allocation_temporary_p ();
5572 /* If a cross reference is requested, look up the type
5573 already defined for this tag and return it. */
5575 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5576 /* Even if this is the wrong type of tag, return what we found.
5577 There will be an error message anyway, from pending_xref_error.
5578 If we create an empty xref just for an invalid use of the type,
5579 the main result is to create lots of superfluous error messages. */
5583 push_obstacks_nochange ();
5585 if (current_binding_level == global_binding_level && temporary)
5586 end_temporary_allocation ();
5588 /* If no such tag is yet defined, create a forward-reference node
5589 and record it as the "definition".
5590 When a real declaration of this type is found,
5591 the forward-reference will be altered into a real type. */
5593 ref = make_node (code);
5594 if (code == ENUMERAL_TYPE)
5596 /* (In ANSI, Enums can be referred to only if already defined.) */
5598 pedwarn ("ANSI C forbids forward references to `enum' types");
5599 /* Give the type a default layout like unsigned int
5600 to avoid crashing if it does not get defined. */
5601 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5602 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5603 TREE_UNSIGNED (ref) = 1;
5604 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5605 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5606 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5609 pushtag (name, ref);
5616 /* Make sure that the tag NAME is defined *in the current binding level*
5617 at least as a forward reference.
5618 CODE says which kind of tag NAME ought to be.
5620 We also do a push_obstacks_nochange
5621 whose matching pop is in finish_struct. */
5624 start_struct (code, name)
5625 enum tree_code code;
5628 /* If there is already a tag defined at this binding level
5629 (as a forward reference), just return it. */
5631 register tree ref = 0;
5633 push_obstacks_nochange ();
5634 if (current_binding_level == global_binding_level)
5635 end_temporary_allocation ();
5638 ref = lookup_tag (code, name, current_binding_level, 1);
5639 if (ref && TREE_CODE (ref) == code)
5641 C_TYPE_BEING_DEFINED (ref) = 1;
5642 TYPE_PACKED (ref) = flag_pack_struct;
5643 if (TYPE_FIELDS (ref))
5644 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5645 : "redefinition of `struct %s'"),
5646 IDENTIFIER_POINTER (name));
5651 /* Otherwise create a forward-reference just so the tag is in scope. */
5653 ref = make_node (code);
5654 pushtag (name, ref);
5655 C_TYPE_BEING_DEFINED (ref) = 1;
5656 TYPE_PACKED (ref) = flag_pack_struct;
5660 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5661 of a structure component, returning a FIELD_DECL node.
5662 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5664 This is done during the parsing of the struct declaration.
5665 The FIELD_DECL nodes are chained together and the lot of them
5666 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5669 grokfield (filename, line, declarator, declspecs, width)
5672 tree declarator, declspecs, width;
5676 /* The corresponding pop_obstacks is in finish_decl. */
5677 push_obstacks_nochange ();
5679 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5681 finish_decl (value, NULL_TREE, NULL_TREE);
5682 DECL_INITIAL (value) = width;
5684 maybe_objc_check_decl (value);
5688 /* Function to help qsort sort FIELD_DECLs by name order. */
5691 field_decl_cmp (xp, yp)
5692 const GENERIC_PTR xp;
5693 const GENERIC_PTR yp;
5695 tree *x = (tree *)xp, *y = (tree *)yp;
5697 if (DECL_NAME (*x) == DECL_NAME (*y))
5699 if (DECL_NAME (*x) == NULL)
5701 if (DECL_NAME (*y) == NULL)
5703 if (DECL_NAME (*x) < DECL_NAME (*y))
5708 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5709 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5710 ATTRIBUTES are attributes to be applied to the structure.
5712 We also do a pop_obstacks to match the push in start_struct. */
5715 finish_struct (t, fieldlist, attributes)
5722 int toplevel = global_binding_level == current_binding_level;
5724 /* If this type was previously laid out as a forward reference,
5725 make sure we lay it out again. */
5729 decl_attributes (t, attributes, NULL_TREE);
5731 /* Nameless union parm types are useful as GCC extension. */
5732 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5733 /* Otherwise, warn about any struct or union def. in parmlist. */
5734 if (in_parm_level_p ())
5737 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5738 : "structure defined inside parms"));
5739 else if (! flag_traditional)
5740 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5741 : "structure defined inside parms"));
5744 old_momentary = suspend_momentary ();
5748 for (x = fieldlist; x; x = TREE_CHAIN (x))
5749 if (DECL_NAME (x) != 0)
5753 pedwarn ("%s has no %smembers",
5754 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5755 (fieldlist ? "named " : ""));
5758 /* Install struct as DECL_CONTEXT of each field decl.
5759 Also process specified field sizes.
5760 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5761 The specified size is found in the DECL_INITIAL.
5762 Store 0 there, except for ": 0" fields (so we can find them
5763 and delete them, below). */
5765 for (x = fieldlist; x; x = TREE_CHAIN (x))
5767 DECL_CONTEXT (x) = t;
5768 DECL_PACKED (x) |= TYPE_PACKED (t);
5769 DECL_FIELD_SIZE (x) = 0;
5771 /* If any field is const, the structure type is pseudo-const. */
5772 if (TREE_READONLY (x))
5773 C_TYPE_FIELDS_READONLY (t) = 1;
5776 /* A field that is pseudo-const makes the structure likewise. */
5777 tree t1 = TREE_TYPE (x);
5778 while (TREE_CODE (t1) == ARRAY_TYPE)
5779 t1 = TREE_TYPE (t1);
5780 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5781 && C_TYPE_FIELDS_READONLY (t1))
5782 C_TYPE_FIELDS_READONLY (t) = 1;
5785 /* Any field that is volatile means variables of this type must be
5786 treated in some ways as volatile. */
5787 if (TREE_THIS_VOLATILE (x))
5788 C_TYPE_FIELDS_VOLATILE (t) = 1;
5790 /* Any field of nominal variable size implies structure is too. */
5791 if (C_DECL_VARIABLE_SIZE (x))
5792 C_TYPE_VARIABLE_SIZE (t) = 1;
5794 /* Detect invalid nested redefinition. */
5795 if (TREE_TYPE (x) == t)
5796 error ("nested redefinition of `%s'",
5797 IDENTIFIER_POINTER (TYPE_NAME (t)));
5799 /* Detect invalid bit-field size. */
5800 if (DECL_INITIAL (x))
5801 STRIP_NOPS (DECL_INITIAL (x));
5802 if (DECL_INITIAL (x))
5804 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5805 constant_expression_warning (DECL_INITIAL (x));
5808 error_with_decl (x, "bit-field `%s' width not an integer constant");
5809 DECL_INITIAL (x) = NULL;
5813 /* Detect invalid bit-field type. */
5814 if (DECL_INITIAL (x)
5815 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5816 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5818 error_with_decl (x, "bit-field `%s' has invalid type");
5819 DECL_INITIAL (x) = NULL;
5821 if (DECL_INITIAL (x) && pedantic
5822 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5823 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5824 /* Accept an enum that's equivalent to int or unsigned int. */
5825 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5826 && (TYPE_PRECISION (TREE_TYPE (x))
5827 == TYPE_PRECISION (integer_type_node))))
5828 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5830 /* Detect and ignore out of range field width. */
5831 if (DECL_INITIAL (x))
5833 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5835 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5837 DECL_INITIAL (x) = NULL;
5838 error_with_decl (x, "negative width in bit-field `%s'");
5840 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5841 || width > TYPE_PRECISION (TREE_TYPE (x)))
5843 DECL_INITIAL (x) = NULL;
5844 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5846 else if (width == 0 && DECL_NAME (x) != 0)
5848 error_with_decl (x, "zero width for bit-field `%s'");
5849 DECL_INITIAL (x) = NULL;
5853 /* Process valid field width. */
5854 if (DECL_INITIAL (x))
5856 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5858 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5859 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5860 TREE_UNSIGNED (TREE_TYPE (x)))
5861 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5862 TREE_UNSIGNED (TREE_TYPE (x)))))
5863 warning_with_decl (x, "`%s' is narrower than values of its type");
5865 DECL_FIELD_SIZE (x) = width;
5866 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5867 DECL_INITIAL (x) = NULL;
5871 /* field size 0 => force desired amount of alignment. */
5872 #ifdef EMPTY_FIELD_BOUNDARY
5873 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5875 #ifdef PCC_BITFIELD_TYPE_MATTERS
5876 if (PCC_BITFIELD_TYPE_MATTERS)
5877 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5878 TYPE_ALIGN (TREE_TYPE (x)));
5882 else if (TREE_TYPE (x) != error_mark_node)
5884 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5885 : TYPE_ALIGN (TREE_TYPE (x)));
5886 /* Non-bit-fields are aligned for their type, except packed
5887 fields which require only BITS_PER_UNIT alignment. */
5888 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5892 /* Now DECL_INITIAL is null on all members. */
5894 /* Delete all duplicate fields from the fieldlist */
5895 for (x = fieldlist; x && TREE_CHAIN (x);)
5896 /* Anonymous fields aren't duplicates. */
5897 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5901 register tree y = fieldlist;
5905 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5911 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5913 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5914 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5916 else x = TREE_CHAIN (x);
5919 /* Now we have the nearly final fieldlist. Record it,
5920 then lay out the structure or union (including the fields). */
5922 TYPE_FIELDS (t) = fieldlist;
5926 /* Delete all zero-width bit-fields from the front of the fieldlist */
5928 && DECL_INITIAL (fieldlist))
5929 fieldlist = TREE_CHAIN (fieldlist);
5930 /* Delete all such members from the rest of the fieldlist */
5931 for (x = fieldlist; x;)
5933 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5934 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5935 else x = TREE_CHAIN (x);
5938 /* Now we have the truly final field list.
5939 Store it in this type and in the variants. */
5941 TYPE_FIELDS (t) = fieldlist;
5943 /* If there are lots of fields, sort so we can look through them fast.
5944 We arbitrarily consider 16 or more elts to be "a lot". */
5948 for (x = fieldlist; x; x = TREE_CHAIN (x))
5959 len += list_length (x);
5960 /* Use the same allocation policy here that make_node uses, to
5961 ensure that this lives as long as the rest of the struct decl.
5962 All decls in an inline function need to be saved. */
5963 if (allocation_temporary_p ())
5964 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5966 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5968 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5969 TYPE_LANG_SPECIFIC (t)->len = len;
5971 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5973 for (x = fieldlist; x; x = TREE_CHAIN (x))
5974 field_array[len++] = x;
5976 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5980 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5982 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5983 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5984 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5987 /* If this was supposed to be a transparent union, but we can't
5988 make it one, warn and turn off the flag. */
5989 if (TREE_CODE (t) == UNION_TYPE
5990 && TYPE_TRANSPARENT_UNION (t)
5991 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5993 TYPE_TRANSPARENT_UNION (t) = 0;
5994 warning ("union cannot be made transparent");
5997 /* If this structure or union completes the type of any previous
5998 variable declaration, lay it out and output its rtl. */
6000 if (current_binding_level->n_incomplete != 0)
6003 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
6005 if (TREE_TYPE (decl) == t
6006 && TREE_CODE (decl) != TYPE_DECL)
6008 layout_decl (decl, 0);
6009 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6010 maybe_objc_check_decl (decl);
6011 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6014 --current_binding_level->n_incomplete;
6016 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6017 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6019 tree element = TREE_TYPE (decl);
6020 while (TREE_CODE (element) == ARRAY_TYPE)
6021 element = TREE_TYPE (element);
6023 layout_array_type (TREE_TYPE (decl));
6028 resume_momentary (old_momentary);
6030 /* Finish debugging output for this type. */
6031 rest_of_type_compilation (t, toplevel);
6033 /* The matching push is in start_struct. */
6039 /* Lay out the type T, and its element type, and so on. */
6042 layout_array_type (t)
6045 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6046 layout_array_type (TREE_TYPE (t));
6050 /* Begin compiling the definition of an enumeration type.
6051 NAME is its name (or null if anonymous).
6052 Returns the type object, as yet incomplete.
6053 Also records info about it so that build_enumerator
6054 may be used to declare the individual values as they are read. */
6060 register tree enumtype = 0;
6062 /* If this is the real definition for a previous forward reference,
6063 fill in the contents in the same object that used to be the
6064 forward reference. */
6067 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6069 /* The corresponding pop_obstacks is in finish_enum. */
6070 push_obstacks_nochange ();
6071 /* If these symbols and types are global, make them permanent. */
6072 if (current_binding_level == global_binding_level)
6073 end_temporary_allocation ();
6075 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6077 enumtype = make_node (ENUMERAL_TYPE);
6078 pushtag (name, enumtype);
6081 C_TYPE_BEING_DEFINED (enumtype) = 1;
6083 if (TYPE_VALUES (enumtype) != 0)
6085 /* This enum is a named one that has been declared already. */
6086 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6088 /* Completely replace its old definition.
6089 The old enumerators remain defined, however. */
6090 TYPE_VALUES (enumtype) = 0;
6093 enum_next_value = integer_zero_node;
6096 if (flag_short_enums)
6097 TYPE_PACKED (enumtype) = 1;
6102 /* After processing and defining all the values of an enumeration type,
6103 install their decls in the enumeration type and finish it off.
6104 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6105 and ATTRIBUTES are the specified attributes.
6106 Returns ENUMTYPE. */
6109 finish_enum (enumtype, values, attributes)
6114 register tree pair, tem;
6115 tree minnode = 0, maxnode = 0;
6116 int lowprec, highprec, precision;
6117 int toplevel = global_binding_level == current_binding_level;
6119 if (in_parm_level_p ())
6120 warning ("enum defined inside parms");
6122 decl_attributes (enumtype, attributes, NULL_TREE);
6124 /* Calculate the maximum value of any enumerator in this type. */
6126 if (values == error_mark_node)
6127 minnode = maxnode = integer_zero_node;
6129 for (pair = values; pair; pair = TREE_CHAIN (pair))
6131 tree value = TREE_VALUE (pair);
6133 minnode = maxnode = TREE_VALUE (pair);
6136 if (tree_int_cst_lt (maxnode, value))
6138 if (tree_int_cst_lt (value, minnode))
6143 TYPE_MIN_VALUE (enumtype) = minnode;
6144 TYPE_MAX_VALUE (enumtype) = maxnode;
6146 /* An enum can have some negative values; then it is signed. */
6147 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6149 /* Determine the precision this type needs. */
6151 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6152 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6153 precision = MAX (lowprec, highprec);
6155 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6157 tree narrowest = type_for_size (precision, 1);
6160 warning ("enumeration values exceed range of largest integer");
6161 narrowest = long_long_integer_type_node;
6164 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6167 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6169 TYPE_SIZE (enumtype) = 0;
6170 layout_type (enumtype);
6172 if (values != error_mark_node)
6174 /* Change the type of the enumerators to be the enum type.
6175 Formerly this was done only for enums that fit in an int,
6176 but the comment said it was done only for enums wider than int.
6177 It seems necessary to do this for wide enums,
6178 and best not to change what's done for ordinary narrower ones. */
6179 for (pair = values; pair; pair = TREE_CHAIN (pair))
6181 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6182 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6183 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6184 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6187 /* Replace the decl nodes in VALUES with their names. */
6188 for (pair = values; pair; pair = TREE_CHAIN (pair))
6189 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6191 TYPE_VALUES (enumtype) = values;
6194 /* Fix up all variant types of this enum type. */
6195 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6197 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6198 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6199 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6200 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6201 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6202 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6203 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6204 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6207 /* Finish debugging output for this type. */
6208 rest_of_type_compilation (enumtype, toplevel);
6210 /* This matches a push in start_enum. */
6216 /* Build and install a CONST_DECL for one value of the
6217 current enumeration type (one that was begun with start_enum).
6218 Return a tree-list containing the CONST_DECL and its value.
6219 Assignment of sequential values by default is handled here. */
6222 build_enumerator (name, value)
6225 register tree decl, type;
6227 /* Validate and default VALUE. */
6229 /* Remove no-op casts from the value. */
6231 STRIP_TYPE_NOPS (value);
6235 if (TREE_CODE (value) == INTEGER_CST)
6237 value = default_conversion (value);
6238 constant_expression_warning (value);
6242 error ("enumerator value for `%s' not integer constant",
6243 IDENTIFIER_POINTER (name));
6248 /* Default based on previous value. */
6249 /* It should no longer be possible to have NON_LVALUE_EXPR
6253 value = enum_next_value;
6255 error ("overflow in enumeration values");
6258 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6260 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6261 value = integer_zero_node;
6264 /* Set basis for default for next value. */
6265 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6266 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6268 /* Now create a declaration for the enum value name. */
6270 type = TREE_TYPE (value);
6271 type = type_for_size (MAX (TYPE_PRECISION (type),
6272 TYPE_PRECISION (integer_type_node)),
6274 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6275 && TREE_UNSIGNED (type)));
6277 decl = build_decl (CONST_DECL, name, type);
6278 DECL_INITIAL (decl) = value;
6279 TREE_TYPE (value) = type;
6282 return saveable_tree_cons (decl, value, NULL_TREE);
6285 /* Create the FUNCTION_DECL for a function definition.
6286 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6287 the declaration; they describe the function's name and the type it returns,
6288 but twisted together in a fashion that parallels the syntax of C.
6290 This function creates a binding context for the function body
6291 as well as setting up the FUNCTION_DECL in current_function_decl.
6293 Returns 1 on success. If the DECLARATOR is not suitable for a function
6294 (it defines a datum instead), we return 0, which tells
6295 yyparse to report a parse error.
6297 NESTED is nonzero for a function nested within another function. */
6300 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6301 tree declarator, declspecs, prefix_attributes, attributes;
6304 tree decl1, old_decl;
6306 int old_immediate_size_expand = immediate_size_expand;
6308 current_function_returns_value = 0; /* Assume, until we see it does. */
6309 current_function_returns_null = 0;
6310 warn_about_return_type = 0;
6311 current_extern_inline = 0;
6312 c_function_varargs = 0;
6314 shadowed_labels = 0;
6316 /* Don't expand any sizes in the return type of the function. */
6317 immediate_size_expand = 0;
6319 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6321 /* If the declarator is not suitable for a function definition,
6322 cause a syntax error. */
6325 immediate_size_expand = old_immediate_size_expand;
6329 decl_attributes (decl1, prefix_attributes, attributes);
6331 announce_function (decl1);
6333 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6335 error ("return-type is an incomplete type");
6336 /* Make it return void instead. */
6338 = build_function_type (void_type_node,
6339 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6342 if (warn_about_return_type)
6343 warning ("return-type defaults to `int'");
6345 /* Save the parm names or decls from this function's declarator
6346 where store_parm_decls will find them. */
6347 current_function_parms = last_function_parms;
6348 current_function_parm_tags = last_function_parm_tags;
6350 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6351 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6352 DECL_INITIAL (decl1) = error_mark_node;
6354 /* If this definition isn't a prototype and we had a prototype declaration
6355 before, copy the arg type info from that prototype.
6356 But not if what we had before was a builtin function. */
6357 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6358 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6359 && !DECL_BUILT_IN (old_decl)
6360 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6361 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6362 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6364 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6365 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6366 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6369 /* If there is no explicit declaration, look for any out-of-scope implicit
6372 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6374 /* Optionally warn of old-fashioned def with no previous prototype. */
6375 if (warn_strict_prototypes
6376 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6377 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6378 warning ("function declaration isn't a prototype");
6379 /* Optionally warn of any global def with no previous prototype. */
6380 else if (warn_missing_prototypes
6381 && TREE_PUBLIC (decl1)
6382 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6383 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6384 warning_with_decl (decl1, "no previous prototype for `%s'");
6385 /* Optionally warn of any def with no previous prototype
6386 if the function has already been used. */
6387 else if (warn_missing_prototypes
6388 && old_decl != 0 && TREE_USED (old_decl)
6389 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6390 warning_with_decl (decl1,
6391 "`%s' was used with no prototype before its definition");
6392 /* Optionally warn of any global def with no previous declaration. */
6393 else if (warn_missing_declarations
6394 && TREE_PUBLIC (decl1)
6396 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6397 warning_with_decl (decl1, "no previous declaration for `%s'");
6398 /* Optionally warn of any def with no previous declaration
6399 if the function has already been used. */
6400 else if (warn_missing_declarations
6401 && old_decl != 0 && TREE_USED (old_decl)
6402 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6403 warning_with_decl (decl1,
6404 "`%s' was used with no declaration before its definition");
6406 /* This is a definition, not a reference.
6407 So normally clear DECL_EXTERNAL.
6408 However, `extern inline' acts like a declaration
6409 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6410 DECL_EXTERNAL (decl1) = current_extern_inline;
6412 /* This function exists in static storage.
6413 (This does not mean `static' in the C sense!) */
6414 TREE_STATIC (decl1) = 1;
6416 /* A nested function is not global. */
6417 if (current_function_decl != 0)
6418 TREE_PUBLIC (decl1) = 0;
6420 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6422 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6427 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6428 != integer_type_node)
6429 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6431 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6432 args = TREE_CHAIN (args))
6434 tree type = args ? TREE_VALUE (args) : 0;
6436 if (type == void_type_node)
6443 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6444 pedwarn_with_decl (decl1,
6445 "first argument of `%s' should be `int'");
6449 if (TREE_CODE (type) != POINTER_TYPE
6450 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6451 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6453 pedwarn_with_decl (decl1,
6454 "second argument of `%s' should be `char **'");
6458 if (TREE_CODE (type) != POINTER_TYPE
6459 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6460 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6462 pedwarn_with_decl (decl1,
6463 "third argument of `%s' should probably be `char **'");
6468 /* It is intentional that this message does not mention the third
6469 argument, which is warned for only pedantically, because it's
6470 blessed by mention in an appendix of the standard. */
6471 if (argct > 0 && (argct < 2 || argct > 3))
6472 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6474 if (argct == 3 && pedantic)
6475 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6477 if (! TREE_PUBLIC (decl1))
6478 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6481 /* Record the decl so that the function name is defined.
6482 If we already have a decl for this name, and it is a FUNCTION_DECL,
6483 use the old decl. */
6485 current_function_decl = pushdecl (decl1);
6488 declare_parm_level (1);
6489 current_binding_level->subblocks_tag_transparent = 1;
6491 make_function_rtl (current_function_decl);
6493 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6494 /* Promote the value to int before returning it. */
6495 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6497 /* It retains unsignedness if traditional
6498 or if not really getting wider. */
6499 if (TREE_UNSIGNED (restype)
6500 && (flag_traditional
6501 || (TYPE_PRECISION (restype)
6502 == TYPE_PRECISION (integer_type_node))))
6503 restype = unsigned_type_node;
6505 restype = integer_type_node;
6507 DECL_RESULT (current_function_decl)
6508 = build_decl (RESULT_DECL, NULL_TREE, restype);
6511 /* Allocate further tree nodes temporarily during compilation
6512 of this function only. */
6513 temporary_allocation ();
6515 /* If this fcn was already referenced via a block-scope `extern' decl
6516 (or an implicit decl), propagate certain information about the usage. */
6517 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6518 TREE_ADDRESSABLE (current_function_decl) = 1;
6520 immediate_size_expand = old_immediate_size_expand;
6525 /* Record that this function is going to be a varargs function.
6526 This is called before store_parm_decls, which is too early
6527 to call mark_varargs directly. */
6532 c_function_varargs = 1;
6535 /* Store the parameter declarations into the current function declaration.
6536 This is called after parsing the parameter declarations, before
6537 digesting the body of the function.
6539 For an old-style definition, modify the function's type
6540 to specify at least the number of arguments. */
6545 register tree fndecl = current_function_decl;
6548 /* This is either a chain of PARM_DECLs (if a prototype was used)
6549 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6550 tree specparms = current_function_parms;
6552 /* This is a list of types declared among parms in a prototype. */
6553 tree parmtags = current_function_parm_tags;
6555 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6556 register tree parmdecls = getdecls ();
6558 /* This is a chain of any other decls that came in among the parm
6559 declarations. If a parm is declared with enum {foo, bar} x;
6560 then CONST_DECLs for foo and bar are put here. */
6563 /* Nonzero if this definition is written with a prototype. */
6566 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6568 /* This case is when the function was defined with an ANSI prototype.
6569 The parms already have decls, so we need not do anything here
6570 except record them as in effect
6571 and complain if any redundant old-style parm decls were written. */
6582 error_with_decl (fndecl,
6583 "parm types given both in parmlist and separately");
6584 /* Get rid of the erroneous decls; don't keep them on
6585 the list of parms, since they might not be PARM_DECLs. */
6586 for (decl = current_binding_level->names;
6587 decl; decl = TREE_CHAIN (decl))
6588 if (DECL_NAME (decl))
6589 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6590 for (link = current_binding_level->shadowed;
6591 link; link = TREE_CHAIN (link))
6592 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6593 current_binding_level->names = 0;
6594 current_binding_level->shadowed = 0;
6597 specparms = nreverse (specparms);
6598 for (parm = specparms; parm; parm = next)
6600 next = TREE_CHAIN (parm);
6601 if (TREE_CODE (parm) == PARM_DECL)
6603 if (DECL_NAME (parm) == 0)
6604 error_with_decl (parm, "parameter name omitted");
6605 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6607 error_with_decl (parm, "parameter `%s' declared void");
6608 /* Change the type to error_mark_node so this parameter
6609 will be ignored by assign_parms. */
6610 TREE_TYPE (parm) = error_mark_node;
6616 /* If we find an enum constant or a type tag,
6617 put it aside for the moment. */
6618 TREE_CHAIN (parm) = 0;
6619 others = chainon (others, parm);
6623 /* Get the decls in their original chain order
6624 and record in the function. */
6625 DECL_ARGUMENTS (fndecl) = getdecls ();
6628 /* If this function takes a variable number of arguments,
6629 add a phony parameter to the end of the parm list,
6630 to represent the position of the first unnamed argument. */
6631 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6634 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6635 /* Let's hope the address of the unnamed parm
6636 won't depend on its type. */
6637 TREE_TYPE (dummy) = integer_type_node;
6638 DECL_ARG_TYPE (dummy) = integer_type_node;
6639 DECL_ARGUMENTS (fndecl)
6640 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6644 /* Now pushdecl the enum constants. */
6645 for (parm = others; parm; parm = next)
6647 next = TREE_CHAIN (parm);
6648 if (DECL_NAME (parm) == 0)
6650 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6652 else if (TREE_CODE (parm) != PARM_DECL)
6656 storetags (chainon (parmtags, gettags ()));
6660 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6661 each with a parm name as the TREE_VALUE.
6663 PARMDECLS is a chain of declarations for parameters.
6664 Warning! It can also contain CONST_DECLs which are not parameters
6665 but are names of enumerators of any enum types
6666 declared among the parameters.
6668 First match each formal parameter name with its declaration.
6669 Associate decls with the names and store the decls
6670 into the TREE_PURPOSE slots. */
6672 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6673 DECL_RESULT (parm) = 0;
6675 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6677 register tree tail, found = NULL;
6679 if (TREE_VALUE (parm) == 0)
6681 error_with_decl (fndecl, "parameter name missing from parameter list");
6682 TREE_PURPOSE (parm) = 0;
6686 /* See if any of the parmdecls specifies this parm by name.
6687 Ignore any enumerator decls. */
6688 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6689 if (DECL_NAME (tail) == TREE_VALUE (parm)
6690 && TREE_CODE (tail) == PARM_DECL)
6696 /* If declaration already marked, we have a duplicate name.
6697 Complain, and don't use this decl twice. */
6698 if (found && DECL_RESULT (found) != 0)
6700 error_with_decl (found, "multiple parameters named `%s'");
6704 /* If the declaration says "void", complain and ignore it. */
6705 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6707 error_with_decl (found, "parameter `%s' declared void");
6708 TREE_TYPE (found) = integer_type_node;
6709 DECL_ARG_TYPE (found) = integer_type_node;
6710 layout_decl (found, 0);
6713 /* Traditionally, a parm declared float is actually a double. */
6714 if (found && flag_traditional
6715 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6717 TREE_TYPE (found) = double_type_node;
6718 DECL_ARG_TYPE (found) = double_type_node;
6719 layout_decl (found, 0);
6722 /* If no declaration found, default to int. */
6725 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6727 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6728 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6729 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6731 warning_with_decl (found, "type of `%s' defaults to `int'");
6735 TREE_PURPOSE (parm) = found;
6737 /* Mark this decl as "already found" -- see test, above.
6738 It is safe to use DECL_RESULT for this
6739 since it is not used in PARM_DECLs or CONST_DECLs. */
6740 DECL_RESULT (found) = error_mark_node;
6743 /* Put anything which is on the parmdecls chain and which is
6744 not a PARM_DECL onto the list NONPARMS. (The types of
6745 non-parm things which might appear on the list include
6746 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6747 any actual PARM_DECLs not matched with any names. */
6750 for (parm = parmdecls; parm; )
6752 tree next = TREE_CHAIN (parm);
6753 TREE_CHAIN (parm) = 0;
6755 if (TREE_CODE (parm) != PARM_DECL)
6756 nonparms = chainon (nonparms, parm);
6759 /* Complain about args with incomplete types. */
6760 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6762 error_with_decl (parm, "parameter `%s' has incomplete type");
6763 TREE_TYPE (parm) = error_mark_node;
6766 if (DECL_RESULT (parm) == 0)
6768 error_with_decl (parm,
6769 "declaration for parameter `%s' but no such parameter");
6770 /* Pretend the parameter was not missing.
6771 This gets us to a standard state and minimizes
6772 further error messages. */
6774 = chainon (specparms,
6775 tree_cons (parm, NULL_TREE, NULL_TREE));
6782 /* Chain the declarations together in the order of the list of names. */
6783 /* Store that chain in the function decl, replacing the list of names. */
6785 DECL_ARGUMENTS (fndecl) = 0;
6788 for (last = 0; parm; parm = TREE_CHAIN (parm))
6789 if (TREE_PURPOSE (parm))
6792 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6794 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6795 last = TREE_PURPOSE (parm);
6796 TREE_CHAIN (last) = 0;
6800 /* If there was a previous prototype,
6801 set the DECL_ARG_TYPE of each argument according to
6802 the type previously specified, and report any mismatches. */
6804 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6807 for (parm = DECL_ARGUMENTS (fndecl),
6808 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6809 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6810 != void_type_node));
6811 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6813 if (parm == 0 || type == 0
6814 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6816 error ("number of arguments doesn't match prototype");
6817 error_with_file_and_line (current_function_prototype_file,
6818 current_function_prototype_line,
6819 "prototype declaration");
6822 /* Type for passing arg must be consistent
6823 with that declared for the arg. */
6824 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6826 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6827 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6829 /* Adjust argument to match prototype. E.g. a previous
6830 `int foo(float);' prototype causes
6831 `int foo(x) float x; {...}' to be treated like
6832 `int foo(float x) {...}'. This is particularly
6833 useful for argument types like uid_t. */
6834 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6835 #ifdef PROMOTE_PROTOTYPES
6836 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6837 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6838 && TYPE_PRECISION (TREE_TYPE (parm))
6839 < TYPE_PRECISION (integer_type_node))
6840 DECL_ARG_TYPE (parm) = integer_type_node;
6844 pedwarn ("promoted argument `%s' doesn't match prototype",
6845 IDENTIFIER_POINTER (DECL_NAME (parm)));
6846 warning_with_file_and_line
6847 (current_function_prototype_file,
6848 current_function_prototype_line,
6849 "prototype declaration");
6852 /* If -traditional, allow `int' argument to match
6853 `unsigned' prototype. */
6854 else if (! (flag_traditional
6855 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6856 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6858 error ("argument `%s' doesn't match prototype",
6859 IDENTIFIER_POINTER (DECL_NAME (parm)));
6860 error_with_file_and_line (current_function_prototype_file,
6861 current_function_prototype_line,
6862 "prototype declaration");
6866 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6869 /* Otherwise, create a prototype that would match. */
6873 tree actual = 0, last = 0, type;
6875 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6877 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6880 TREE_CHAIN (last) = type;
6885 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6887 TREE_CHAIN (last) = type;
6891 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6892 of the type of this function, but we need to avoid having this
6893 affect the types of other similarly-typed functions, so we must
6894 first force the generation of an identical (but separate) type
6895 node for the relevant function type. The new node we create
6896 will be a variant of the main variant of the original function
6899 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6901 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6904 /* Now store the final chain of decls for the arguments
6905 as the decl-chain of the current lexical scope.
6906 Put the enumerators in as well, at the front so that
6907 DECL_ARGUMENTS is not modified. */
6909 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6912 /* Make sure the binding level for the top of the function body
6913 gets a BLOCK if there are any in the function.
6914 Otherwise, the dbx output is wrong. */
6916 keep_next_if_subblocks = 1;
6918 /* ??? This might be an improvement,
6919 but needs to be thought about some more. */
6921 keep_next_level_flag = 1;
6924 /* Write a record describing this function definition to the prototypes
6925 file (if requested). */
6927 gen_aux_info_record (fndecl, 1, 0, prototype);
6929 /* Initialize the RTL code for the function. */
6931 init_function_start (fndecl, input_filename, lineno);
6933 /* If this is a varargs function, inform function.c. */
6935 if (c_function_varargs)
6938 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6940 declare_function_name ();
6942 /* Set up parameters and prepare for return, for the function. */
6944 expand_function_start (fndecl, 0);
6946 /* If this function is `main', emit a call to `__main'
6947 to run global initializers, etc. */
6948 if (DECL_NAME (fndecl)
6949 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6950 && DECL_CONTEXT (fndecl) == NULL_TREE)
6951 expand_main_function ();
6954 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6955 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6956 stands for an ellipsis in the identifier list.
6958 PARMLIST is the data returned by get_parm_info for the
6959 parmlist that follows the semicolon.
6961 We return a value of the same sort that get_parm_info returns,
6962 except that it describes the combination of identifiers and parmlist. */
6965 combine_parm_decls (specparms, parmlist, void_at_end)
6966 tree specparms, parmlist;
6969 register tree fndecl = current_function_decl;
6972 tree parmdecls = TREE_PURPOSE (parmlist);
6974 /* This is a chain of any other decls that came in among the parm
6975 declarations. They were separated already by get_parm_info,
6976 so we just need to keep them separate. */
6977 tree nonparms = TREE_VALUE (parmlist);
6981 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6982 DECL_RESULT (parm) = 0;
6984 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6986 register tree tail, found = NULL;
6988 /* See if any of the parmdecls specifies this parm by name. */
6989 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6990 if (DECL_NAME (tail) == TREE_VALUE (parm))
6996 /* If declaration already marked, we have a duplicate name.
6997 Complain, and don't use this decl twice. */
6998 if (found && DECL_RESULT (found) != 0)
7000 error_with_decl (found, "multiple parameters named `%s'");
7004 /* If the declaration says "void", complain and ignore it. */
7005 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7007 error_with_decl (found, "parameter `%s' declared void");
7008 TREE_TYPE (found) = integer_type_node;
7009 DECL_ARG_TYPE (found) = integer_type_node;
7010 layout_decl (found, 0);
7013 /* Traditionally, a parm declared float is actually a double. */
7014 if (found && flag_traditional
7015 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7017 TREE_TYPE (found) = double_type_node;
7018 DECL_ARG_TYPE (found) = double_type_node;
7019 layout_decl (found, 0);
7022 /* If no declaration found, default to int. */
7025 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7027 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7028 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7029 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7030 error_with_decl (found, "type of parameter `%s' is not declared");
7034 TREE_PURPOSE (parm) = found;
7036 /* Mark this decl as "already found" -- see test, above.
7037 It is safe to use DECL_RESULT for this
7038 since it is not used in PARM_DECLs or CONST_DECLs. */
7039 DECL_RESULT (found) = error_mark_node;
7042 /* Complain about any actual PARM_DECLs not matched with any names. */
7044 for (parm = parmdecls; parm; )
7046 tree next = TREE_CHAIN (parm);
7047 TREE_CHAIN (parm) = 0;
7049 /* Complain about args with incomplete types. */
7050 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7052 error_with_decl (parm, "parameter `%s' has incomplete type");
7053 TREE_TYPE (parm) = error_mark_node;
7056 if (DECL_RESULT (parm) == 0)
7058 error_with_decl (parm,
7059 "declaration for parameter `%s' but no such parameter");
7060 /* Pretend the parameter was not missing.
7061 This gets us to a standard state and minimizes
7062 further error messages. */
7064 = chainon (specparms,
7065 tree_cons (parm, NULL_TREE, NULL_TREE));
7071 /* Chain the declarations together in the order of the list of names.
7072 At the same time, build up a list of their types, in reverse order. */
7078 for (last = 0; parm; parm = TREE_CHAIN (parm))
7079 if (TREE_PURPOSE (parm))
7082 parmdecls = TREE_PURPOSE (parm);
7084 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7085 last = TREE_PURPOSE (parm);
7086 TREE_CHAIN (last) = 0;
7088 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7093 return saveable_tree_cons (parmdecls, nonparms,
7094 nreverse (saveable_tree_cons (NULL_TREE,
7098 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7101 /* Finish up a function declaration and compile that function
7102 all the way to assembler language output. The free the storage
7103 for the function definition.
7105 This is called after parsing the body of the function definition.
7107 NESTED is nonzero if the function being finished is nested in another. */
7110 finish_function (nested)
7113 register tree fndecl = current_function_decl;
7115 /* TREE_READONLY (fndecl) = 1;
7116 This caused &foo to be of type ptr-to-const-function
7117 which then got a warning when stored in a ptr-to-function variable. */
7120 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7122 /* Must mark the RESULT_DECL as being in this function. */
7124 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7126 /* Obey `register' declarations if `setjmp' is called in this fn. */
7127 if (flag_traditional && current_function_calls_setjmp)
7129 setjmp_protect (DECL_INITIAL (fndecl));
7130 setjmp_protect_args ();
7133 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7135 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7136 != integer_type_node)
7138 /* You would expect the sense of this test to be the other way
7139 around, but if warn_main is set, we will already have warned,
7140 so this would be a duplicate. This is the warning you get
7141 in some environments even if you *don't* ask for it, because
7142 these are environments where it may be more of a problem than
7145 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7149 #ifdef DEFAULT_MAIN_RETURN
7150 /* Make it so that `main' always returns success by default. */
7151 DEFAULT_MAIN_RETURN;
7156 /* Generate rtl for function exit. */
7157 expand_function_end (input_filename, lineno, 0);
7159 /* So we can tell if jump_optimize sets it to 1. */
7162 /* Run the optimizers and output the assembler code for this function. */
7163 rest_of_compilation (fndecl);
7165 current_function_returns_null |= can_reach_end;
7167 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7168 warning ("`noreturn' function does return");
7169 else if (warn_return_type && can_reach_end
7170 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7171 /* If this function returns non-void and control can drop through,
7173 warning ("control reaches end of non-void function");
7174 /* With just -W, complain only if function returns both with
7175 and without a value. */
7176 else if (extra_warnings
7177 && current_function_returns_value && current_function_returns_null)
7178 warning ("this function may return with or without a value");
7180 /* If requested, warn about function definitions where the function will
7181 return a value (usually of some struct or union type) which itself will
7182 take up a lot of stack space. */
7184 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7186 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7190 register tree ret_type_size = TYPE_SIZE (ret_type);
7192 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7195 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7197 if (units > larger_than_size)
7198 warning_with_decl (fndecl,
7199 "size of return value of `%s' is %u bytes",
7205 /* Free all the tree nodes making up this function. */
7206 /* Switch back to allocating nodes permanently
7207 until we start another function. */
7209 permanent_allocation (1);
7211 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7213 /* Stop pointing to the local nodes about to be freed. */
7214 /* But DECL_INITIAL must remain nonzero so we know this
7215 was an actual function definition. */
7216 /* For a nested function, this is done in pop_c_function_context. */
7217 /* If rest_of_compilation set this to 0, leave it 0. */
7218 if (DECL_INITIAL (fndecl) != 0)
7219 DECL_INITIAL (fndecl) = error_mark_node;
7220 DECL_ARGUMENTS (fndecl) = 0;
7223 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7225 #ifndef ASM_OUTPUT_CONSTRUCTOR
7226 if (! flag_gnu_linker)
7227 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7230 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7232 if (DECL_STATIC_DESTRUCTOR (fndecl))
7234 #ifndef ASM_OUTPUT_DESTRUCTOR
7235 if (! flag_gnu_linker)
7236 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7239 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7244 /* Let the error reporting routines know that we're outside a
7245 function. For a nested function, this value is used in
7246 pop_c_function_context and then reset via pop_function_context. */
7247 current_function_decl = NULL;
7251 /* Save and restore the variables in this file and elsewhere
7252 that keep track of the progress of compilation of the current function.
7253 Used for nested functions. */
7257 struct c_function *next;
7259 tree shadowed_labels;
7262 int warn_about_return_type;
7264 struct binding_level *binding_level;
7267 struct c_function *c_function_chain;
7269 /* Save and reinitialize the variables
7270 used during compilation of a C function. */
7273 push_c_function_context ()
7275 struct c_function *p
7276 = (struct c_function *) xmalloc (sizeof (struct c_function));
7279 pedwarn ("ANSI C forbids nested functions");
7281 push_function_context ();
7283 p->next = c_function_chain;
7284 c_function_chain = p;
7286 p->named_labels = named_labels;
7287 p->shadowed_labels = shadowed_labels;
7288 p->returns_value = current_function_returns_value;
7289 p->returns_null = current_function_returns_null;
7290 p->warn_about_return_type = warn_about_return_type;
7291 p->extern_inline = current_extern_inline;
7292 p->binding_level = current_binding_level;
7295 /* Restore the variables used during compilation of a C function. */
7298 pop_c_function_context ()
7300 struct c_function *p = c_function_chain;
7303 /* Bring back all the labels that were shadowed. */
7304 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7305 if (DECL_NAME (TREE_VALUE (link)) != 0)
7306 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7307 = TREE_VALUE (link);
7309 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7311 /* Stop pointing to the local nodes about to be freed. */
7312 /* But DECL_INITIAL must remain nonzero so we know this
7313 was an actual function definition. */
7314 DECL_INITIAL (current_function_decl) = error_mark_node;
7315 DECL_ARGUMENTS (current_function_decl) = 0;
7318 pop_function_context ();
7320 c_function_chain = p->next;
7322 named_labels = p->named_labels;
7323 shadowed_labels = p->shadowed_labels;
7324 current_function_returns_value = p->returns_value;
7325 current_function_returns_null = p->returns_null;
7326 warn_about_return_type = p->warn_about_return_type;
7327 current_extern_inline = p->extern_inline;
7328 current_binding_level = p->binding_level;
7333 /* integrate_decl_tree calls this function, but since we don't use the
7334 DECL_LANG_SPECIFIC field, this is a no-op. */
7337 copy_lang_decl (node)
7338 tree node ATTRIBUTE_UNUSED;