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
2011 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2015 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2016 But preserve OLDDECL's DECL_UID. */
2018 register unsigned olddecl_uid = DECL_UID (olddecl);
2020 bcopy ((char *) newdecl + sizeof (struct tree_common),
2021 (char *) olddecl + sizeof (struct tree_common),
2022 sizeof (struct tree_decl) - sizeof (struct tree_common));
2023 DECL_UID (olddecl) = olddecl_uid;
2026 /* NEWDECL contains the merged attribute lists.
2027 Update OLDDECL to be the same. */
2028 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2033 /* Record a decl-node X as belonging to the current lexical scope.
2034 Check for errors (such as an incompatible declaration for the same
2035 name already seen in the same scope).
2037 Returns either X or an old decl for the same name.
2038 If an old decl is returned, it may have been smashed
2039 to agree with what X says. */
2046 register tree name = DECL_NAME (x);
2047 register struct binding_level *b = current_binding_level;
2049 DECL_CONTEXT (x) = current_function_decl;
2050 /* A local extern declaration for a function doesn't constitute nesting.
2051 A local auto declaration does, since it's a forward decl
2052 for a nested function coming later. */
2053 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2054 && DECL_EXTERNAL (x))
2055 DECL_CONTEXT (x) = 0;
2057 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2058 && x != IDENTIFIER_IMPLICIT_DECL (name)
2059 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2060 && !DECL_IN_SYSTEM_HEADER (x))
2061 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2067 int different_binding_level = 0;
2069 t = lookup_name_current_level (name);
2070 /* Don't type check externs here when -traditional. This is so that
2071 code with conflicting declarations inside blocks will get warnings
2072 not errors. X11 for instance depends on this. */
2073 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2075 t = IDENTIFIER_GLOBAL_VALUE (name);
2076 /* Type decls at global scope don't conflict with externs declared
2077 inside lexical blocks. */
2078 if (t && TREE_CODE (t) == TYPE_DECL)
2080 different_binding_level = 1;
2082 if (t != 0 && t == error_mark_node)
2083 /* error_mark_node is 0 for a while during initialization! */
2086 error_with_decl (x, "`%s' used prior to declaration");
2091 file = DECL_SOURCE_FILE (t);
2092 line = DECL_SOURCE_LINE (t);
2095 /* If this decl is `static' and an implicit decl was seen previously,
2096 warn. But don't complain if -traditional,
2097 since traditional compilers don't complain. */
2098 if (! flag_traditional && TREE_PUBLIC (name)
2099 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2100 sets this for all functions. */
2101 && ! TREE_PUBLIC (x)
2102 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2103 /* We used to warn also for explicit extern followed by static,
2104 but sometimes you need to do it that way. */
2105 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2107 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2108 IDENTIFIER_POINTER (name));
2109 pedwarn_with_file_and_line
2110 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2111 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2112 "previous declaration of `%s'",
2113 IDENTIFIER_POINTER (name));
2114 TREE_THIS_VOLATILE (name) = 1;
2117 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2119 if (TREE_CODE (t) == PARM_DECL)
2121 /* Don't allow more than one "real" duplicate
2122 of a forward parm decl. */
2123 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2129 /* If we are processing a typedef statement, generate a whole new
2130 ..._TYPE node (which will be just an variant of the existing
2131 ..._TYPE node with identical properties) and then install the
2132 TYPE_DECL node generated to represent the typedef name as the
2133 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2135 The whole point here is to end up with a situation where each
2136 and every ..._TYPE node the compiler creates will be uniquely
2137 associated with AT MOST one node representing a typedef name.
2138 This way, even though the compiler substitutes corresponding
2139 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2140 early on, later parts of the compiler can always do the reverse
2141 translation and get back the corresponding typedef name. For
2144 typedef struct S MY_TYPE;
2147 Later parts of the compiler might only know that `object' was of
2148 type `struct S' if it were not for code just below. With this
2149 code however, later parts of the compiler see something like:
2151 struct S' == struct S
2152 typedef struct S' MY_TYPE;
2155 And they can then deduce (from the node for type struct S') that
2156 the original object declaration was:
2160 Being able to do this is important for proper support of protoize,
2161 and also for generating precise symbolic debugging information
2162 which takes full account of the programmer's (typedef) vocabulary.
2164 Obviously, we don't want to generate a duplicate ..._TYPE node if
2165 the TYPE_DECL node that we are now processing really represents a
2166 standard built-in type.
2168 Since all standard types are effectively declared at line zero
2169 in the source file, we can easily check to see if we are working
2170 on a standard type by checking the current value of lineno. */
2172 if (TREE_CODE (x) == TYPE_DECL)
2174 if (DECL_SOURCE_LINE (x) == 0)
2176 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2177 TYPE_NAME (TREE_TYPE (x)) = x;
2179 else if (TREE_TYPE (x) != error_mark_node
2180 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2182 tree tt = TREE_TYPE (x);
2183 DECL_ORIGINAL_TYPE (x) = tt;
2184 tt = build_type_copy (tt);
2190 /* Multiple external decls of the same identifier ought to match.
2191 Check against both global declarations (when traditional) and out of
2192 scope (limbo) block level declarations.
2194 We get warnings about inline functions where they are defined.
2195 Avoid duplicate warnings where they are used. */
2196 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2200 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2201 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2202 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2203 decl = IDENTIFIER_GLOBAL_VALUE (name);
2204 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2205 /* Decls in limbo are always extern, so no need to check that. */
2206 decl = IDENTIFIER_LIMBO_VALUE (name);
2210 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2211 /* If old decl is built-in, we already warned if we should. */
2212 && !DECL_BUILT_IN (decl))
2214 pedwarn_with_decl (x,
2215 "type mismatch with previous external decl");
2216 pedwarn_with_decl (decl, "previous external decl of `%s'");
2220 /* If a function has had an implicit declaration, and then is defined,
2221 make sure they are compatible. */
2223 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2224 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2225 && TREE_CODE (x) == FUNCTION_DECL
2226 && ! comptypes (TREE_TYPE (x),
2227 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2229 warning_with_decl (x, "type mismatch with previous implicit declaration");
2230 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2231 "previous implicit declaration of `%s'");
2234 /* In PCC-compatibility mode, extern decls of vars with no current decl
2235 take effect at top level no matter where they are. */
2236 if (flag_traditional && DECL_EXTERNAL (x)
2237 && lookup_name (name) == 0)
2239 tree type = TREE_TYPE (x);
2241 /* But don't do this if the type contains temporary nodes. */
2244 if (type == error_mark_node)
2246 if (! TREE_PERMANENT (type))
2248 warning_with_decl (x, "type of external `%s' is not global");
2249 /* By exiting the loop early, we leave TYPE nonzero,
2250 and thus prevent globalization of the decl. */
2253 else if (TREE_CODE (type) == FUNCTION_TYPE
2254 && TYPE_ARG_TYPES (type) != 0)
2255 /* The types might not be truly local,
2256 but the list of arg types certainly is temporary.
2257 Since prototypes are nontraditional,
2258 ok not to do the traditional thing. */
2260 type = TREE_TYPE (type);
2264 b = global_binding_level;
2267 /* This name is new in its binding level.
2268 Install the new declaration and return it. */
2269 if (b == global_binding_level)
2271 /* Install a global value. */
2273 /* If the first global decl has external linkage,
2274 warn if we later see static one. */
2275 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2276 TREE_PUBLIC (name) = 1;
2278 IDENTIFIER_GLOBAL_VALUE (name) = x;
2280 /* We no longer care about any previous block level declarations. */
2281 IDENTIFIER_LIMBO_VALUE (name) = 0;
2283 /* Don't forget if the function was used via an implicit decl. */
2284 if (IDENTIFIER_IMPLICIT_DECL (name)
2285 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2286 TREE_USED (x) = 1, TREE_USED (name) = 1;
2288 /* Don't forget if its address was taken in that way. */
2289 if (IDENTIFIER_IMPLICIT_DECL (name)
2290 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2291 TREE_ADDRESSABLE (x) = 1;
2293 /* Warn about mismatches against previous implicit decl. */
2294 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2295 /* If this real decl matches the implicit, don't complain. */
2296 && ! (TREE_CODE (x) == FUNCTION_DECL
2297 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2298 == integer_type_node)))
2299 pedwarn ("`%s' was previously implicitly declared to return `int'",
2300 IDENTIFIER_POINTER (name));
2302 /* If this decl is `static' and an `extern' was seen previously,
2303 that is erroneous. */
2304 if (TREE_PUBLIC (name)
2305 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2307 /* Okay to redeclare an ANSI built-in as static. */
2308 if (t != 0 && DECL_BUILT_IN (t))
2310 /* Okay to declare a non-ANSI built-in as anything. */
2311 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2313 /* Okay to have global type decl after an earlier extern
2314 declaration inside a lexical block. */
2315 else if (TREE_CODE (x) == TYPE_DECL)
2317 else if (IDENTIFIER_IMPLICIT_DECL (name))
2319 if (! TREE_THIS_VOLATILE (name))
2320 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2321 IDENTIFIER_POINTER (name));
2324 pedwarn ("`%s' was declared `extern' and later `static'",
2325 IDENTIFIER_POINTER (name));
2330 /* Here to install a non-global value. */
2331 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2332 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2333 IDENTIFIER_LOCAL_VALUE (name) = x;
2335 /* If this is an extern function declaration, see if we
2336 have a global definition or declaration for the function. */
2338 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2340 && TREE_CODE (x) == FUNCTION_DECL
2341 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2343 /* We have one. Their types must agree. */
2344 if (! comptypes (TREE_TYPE (x),
2345 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2346 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2349 /* Inner extern decl is inline if global one is.
2350 Copy enough to really inline it. */
2351 if (DECL_INLINE (oldglobal))
2353 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2354 DECL_INITIAL (x) = (current_function_decl == oldglobal
2355 ? 0 : DECL_INITIAL (oldglobal));
2356 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2357 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2358 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2359 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2360 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2361 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2363 /* Inner extern decl is built-in if global one is. */
2364 if (DECL_BUILT_IN (oldglobal))
2366 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2367 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2369 /* Keep the arg types from a file-scope fcn defn. */
2370 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2371 && DECL_INITIAL (oldglobal)
2372 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2373 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2377 #if 0 /* This case is probably sometimes the right thing to do. */
2378 /* If we have a local external declaration,
2379 then any file-scope declaration should not
2380 have been static. */
2381 if (oldlocal == 0 && oldglobal != 0
2382 && !TREE_PUBLIC (oldglobal)
2383 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2384 warning ("`%s' locally external but globally static",
2385 IDENTIFIER_POINTER (name));
2388 /* If we have a local external declaration,
2389 and no file-scope declaration has yet been seen,
2390 then if we later have a file-scope decl it must not be static. */
2392 && DECL_EXTERNAL (x)
2396 TREE_PUBLIC (name) = 1;
2398 /* Save this decl, so that we can do type checking against
2399 other decls after it falls out of scope.
2401 Only save it once. This prevents temporary decls created in
2402 expand_inline_function from being used here, since this
2403 will have been set when the inline function was parsed.
2404 It also helps give slightly better warnings. */
2405 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2406 IDENTIFIER_LIMBO_VALUE (name) = x;
2409 /* Warn if shadowing an argument at the top level of the body. */
2410 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2411 /* This warning doesn't apply to the parms of a nested fcn. */
2412 && ! current_binding_level->parm_flag
2413 /* Check that this is one level down from the parms. */
2414 && current_binding_level->level_chain->parm_flag
2415 /* Check that the decl being shadowed
2416 comes from the parm level, one level up. */
2417 && chain_member (oldlocal, current_binding_level->level_chain->names))
2419 if (TREE_CODE (oldlocal) == PARM_DECL)
2420 pedwarn ("declaration of `%s' shadows a parameter",
2421 IDENTIFIER_POINTER (name));
2423 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2424 IDENTIFIER_POINTER (name));
2427 /* Maybe warn if shadowing something else. */
2428 else if (warn_shadow && !DECL_EXTERNAL (x)
2429 /* No shadow warnings for internally generated vars. */
2430 && DECL_SOURCE_LINE (x) != 0
2431 /* No shadow warnings for vars made for inlining. */
2432 && ! DECL_FROM_INLINE (x))
2434 char *warnstring = 0;
2436 if (TREE_CODE (x) == PARM_DECL
2437 && current_binding_level->level_chain->parm_flag)
2438 /* Don't warn about the parm names in function declarator
2439 within a function declarator.
2440 It would be nice to avoid warning in any function
2441 declarator in a declaration, as opposed to a definition,
2442 but there is no way to tell it's not a definition. */
2444 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2445 warnstring = "declaration of `%s' shadows a parameter";
2446 else if (oldlocal != 0)
2447 warnstring = "declaration of `%s' shadows previous local";
2448 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2449 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2450 warnstring = "declaration of `%s' shadows global declaration";
2453 warning (warnstring, IDENTIFIER_POINTER (name));
2456 /* If storing a local value, there may already be one (inherited).
2457 If so, record it for restoration when this binding level ends. */
2459 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2462 /* Keep count of variables in this level with incomplete type. */
2463 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2467 /* Put decls on list in reverse order.
2468 We will reverse them later if necessary. */
2469 TREE_CHAIN (x) = b->names;
2475 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2478 pushdecl_top_level (x)
2482 register struct binding_level *b = current_binding_level;
2484 current_binding_level = global_binding_level;
2486 current_binding_level = b;
2490 /* Generate an implicit declaration for identifier FUNCTIONID
2491 as a function of type int (). Print a warning if appropriate. */
2494 implicitly_declare (functionid)
2498 int traditional_warning = 0;
2499 /* Only one "implicit declaration" warning per identifier. */
2500 int implicit_warning;
2502 /* Save the decl permanently so we can warn if definition follows. */
2503 push_obstacks_nochange ();
2504 end_temporary_allocation ();
2506 /* We used to reuse an old implicit decl here,
2507 but this loses with inline functions because it can clobber
2508 the saved decl chains. */
2509 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2510 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2512 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2514 /* Warn of implicit decl following explicit local extern decl.
2515 This is probably a program designed for traditional C. */
2516 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2517 traditional_warning = 1;
2519 /* Warn once of an implicit declaration. */
2520 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2522 DECL_EXTERNAL (decl) = 1;
2523 TREE_PUBLIC (decl) = 1;
2525 /* Record that we have an implicit decl and this is it. */
2526 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2528 /* ANSI standard says implicit declarations are in the innermost block.
2529 So we record the decl in the standard fashion.
2530 If flag_traditional is set, pushdecl does it top-level. */
2533 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2534 maybe_objc_check_decl (decl);
2536 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2538 if (mesg_implicit_function_declaration && implicit_warning)
2540 if (mesg_implicit_function_declaration == 2)
2541 error ("implicit declaration of function `%s'",
2542 IDENTIFIER_POINTER (functionid));
2544 warning ("implicit declaration of function `%s'",
2545 IDENTIFIER_POINTER (functionid));
2547 else if (warn_traditional && traditional_warning)
2548 warning ("function `%s' was previously declared within a block",
2549 IDENTIFIER_POINTER (functionid));
2551 /* Write a record describing this implicit function declaration to the
2552 prototypes file (if requested). */
2554 gen_aux_info_record (decl, 0, 1, 0);
2561 /* Return zero if the declaration NEWDECL is valid
2562 when the declaration OLDDECL (assumed to be for the same name)
2563 has already been seen.
2564 Otherwise return an error message format string with a %s
2565 where the identifier should go. */
2568 redeclaration_error_message (newdecl, olddecl)
2569 tree newdecl, olddecl;
2571 if (TREE_CODE (newdecl) == TYPE_DECL)
2573 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2575 /* pushdecl creates distinct types for TYPE_DECLs by calling
2576 build_type_copy, so the above comparison generally fails. We do
2577 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2578 is equivalent to what this code used to do before the build_type_copy
2579 call. The variant type distinction should not matter for traditional
2580 code, because it doesn't have type qualifiers. */
2581 if (flag_traditional
2582 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2584 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2586 return "redefinition of `%s'";
2588 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2590 /* Declarations of functions can insist on internal linkage
2591 but they can't be inconsistent with internal linkage,
2592 so there can be no error on that account.
2593 However defining the same name twice is no good. */
2594 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2595 /* However, defining once as extern inline and a second
2596 time in another way is ok. */
2597 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2598 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2599 return "redefinition of `%s'";
2602 else if (current_binding_level == global_binding_level)
2604 /* Objects declared at top level: */
2605 /* If at least one is a reference, it's ok. */
2606 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2608 /* Reject two definitions. */
2609 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2610 return "redefinition of `%s'";
2611 /* Now we have two tentative defs, or one tentative and one real def. */
2612 /* Insist that the linkage match. */
2613 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2614 return "conflicting declarations of `%s'";
2617 else if (current_binding_level->parm_flag
2618 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2622 /* Newdecl has block scope. If olddecl has block scope also, then
2623 reject two definitions, and reject a definition together with an
2624 external reference. Otherwise, it is OK, because newdecl must
2625 be an extern reference to olddecl. */
2626 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2627 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2628 return "redeclaration of `%s'";
2633 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2634 Create one if none exists so far for the current function.
2635 This function is called for both label definitions and label references. */
2641 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2643 if (current_function_decl == 0)
2645 error ("label %s referenced outside of any function",
2646 IDENTIFIER_POINTER (id));
2650 /* Use a label already defined or ref'd with this name. */
2653 /* But not if it is inherited and wasn't declared to be inheritable. */
2654 if (DECL_CONTEXT (decl) != current_function_decl
2655 && ! C_DECLARED_LABEL_FLAG (decl))
2656 return shadow_label (id);
2660 decl = build_decl (LABEL_DECL, id, void_type_node);
2662 /* Make sure every label has an rtx. */
2665 /* A label not explicitly declared must be local to where it's ref'd. */
2666 DECL_CONTEXT (decl) = current_function_decl;
2668 DECL_MODE (decl) = VOIDmode;
2670 /* Say where one reference is to the label,
2671 for the sake of the error if it is not defined. */
2672 DECL_SOURCE_LINE (decl) = lineno;
2673 DECL_SOURCE_FILE (decl) = input_filename;
2675 IDENTIFIER_LABEL_VALUE (id) = decl;
2677 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2682 /* Make a label named NAME in the current function,
2683 shadowing silently any that may be inherited from containing functions
2684 or containing scopes.
2686 Note that valid use, if the label being shadowed
2687 comes from another scope in the same function,
2688 requires calling declare_nonlocal_label right away. */
2694 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2700 /* Check to make sure that the label hasn't already been declared
2701 at this label scope */
2702 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2703 if (TREE_VALUE (dup) == decl)
2705 error ("duplicate label declaration `%s'",
2706 IDENTIFIER_POINTER (name));
2707 error_with_decl (TREE_VALUE (dup),
2708 "this is a previous declaration");
2709 /* Just use the previous declaration. */
2710 return lookup_label (name);
2713 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2714 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2717 return lookup_label (name);
2720 /* Define a label, specifying the location in the source file.
2721 Return the LABEL_DECL node for the label, if the definition is valid.
2722 Otherwise return 0. */
2725 define_label (filename, line, name)
2730 tree decl = lookup_label (name);
2732 /* If label with this name is known from an outer context, shadow it. */
2733 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2735 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2736 IDENTIFIER_LABEL_VALUE (name) = 0;
2737 decl = lookup_label (name);
2740 if (DECL_INITIAL (decl) != 0)
2742 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2747 /* Mark label as having been defined. */
2748 DECL_INITIAL (decl) = error_mark_node;
2749 /* Say where in the source. */
2750 DECL_SOURCE_FILE (decl) = filename;
2751 DECL_SOURCE_LINE (decl) = line;
2756 /* Return the list of declarations of the current level.
2757 Note that this list is in reverse order unless/until
2758 you nreverse it; and when you do nreverse it, you must
2759 store the result back using `storedecls' or you will lose. */
2764 return current_binding_level->names;
2767 /* Return the list of type-tags (for structs, etc) of the current level. */
2772 return current_binding_level->tags;
2775 /* Store the list of declarations of the current level.
2776 This is done for the parameter declarations of a function being defined,
2777 after they are modified in the light of any missing parameters. */
2783 current_binding_level->names = decls;
2786 /* Similarly, store the list of tags of the current level. */
2792 current_binding_level->tags = tags;
2795 /* Given NAME, an IDENTIFIER_NODE,
2796 return the structure (or union or enum) definition for that name.
2797 Searches binding levels from BINDING_LEVEL up to the global level.
2798 If THISLEVEL_ONLY is nonzero, searches only the specified context
2799 (but skips any tag-transparent contexts to find one that is
2800 meaningful for tags).
2801 CODE says which kind of type the caller wants;
2802 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2803 If the wrong kind of type is found, an error is reported. */
2806 lookup_tag (code, name, binding_level, thislevel_only)
2807 enum tree_code code;
2808 struct binding_level *binding_level;
2812 register struct binding_level *level;
2814 for (level = binding_level; level; level = level->level_chain)
2817 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2819 if (TREE_PURPOSE (tail) == name)
2821 if (TREE_CODE (TREE_VALUE (tail)) != code)
2823 /* Definition isn't the kind we were looking for. */
2824 pending_invalid_xref = name;
2825 pending_invalid_xref_file = input_filename;
2826 pending_invalid_xref_line = lineno;
2828 return TREE_VALUE (tail);
2831 if (thislevel_only && ! level->tag_transparent)
2837 /* Print an error message now
2838 for a recent invalid struct, union or enum cross reference.
2839 We don't print them immediately because they are not invalid
2840 when used in the `struct foo;' construct for shadowing. */
2843 pending_xref_error ()
2845 if (pending_invalid_xref != 0)
2846 error_with_file_and_line (pending_invalid_xref_file,
2847 pending_invalid_xref_line,
2848 "`%s' defined as wrong kind of tag",
2849 IDENTIFIER_POINTER (pending_invalid_xref));
2850 pending_invalid_xref = 0;
2853 /* Given a type, find the tag that was defined for it and return the tag name.
2854 Otherwise return 0. */
2857 lookup_tag_reverse (type)
2860 register struct binding_level *level;
2862 for (level = current_binding_level; level; level = level->level_chain)
2865 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2867 if (TREE_VALUE (tail) == type)
2868 return TREE_PURPOSE (tail);
2874 /* Look up NAME in the current binding level and its superiors
2875 in the namespace of variables, functions and typedefs.
2876 Return a ..._DECL node of some kind representing its definition,
2877 or return 0 if it is undefined. */
2884 if (current_binding_level != global_binding_level
2885 && IDENTIFIER_LOCAL_VALUE (name))
2886 val = IDENTIFIER_LOCAL_VALUE (name);
2888 val = IDENTIFIER_GLOBAL_VALUE (name);
2892 /* Similar to `lookup_name' but look only at current binding level. */
2895 lookup_name_current_level (name)
2900 if (current_binding_level == global_binding_level)
2901 return IDENTIFIER_GLOBAL_VALUE (name);
2903 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2906 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2907 if (DECL_NAME (t) == name)
2913 /* Create the predefined scalar types of C,
2914 and some nodes representing standard constants (0, 1, (void *) 0).
2915 Initialize the global binding level.
2916 Make definitions for built-in primitive functions. */
2919 init_decl_processing ()
2921 register tree endlink;
2922 /* Either char* or void*. */
2923 tree traditional_ptr_type_node;
2924 /* Data types of memcpy and strlen. */
2925 tree memcpy_ftype, memset_ftype, strlen_ftype;
2926 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2927 int wchar_type_size;
2929 tree array_domain_type;
2931 current_function_decl = NULL;
2932 named_labels = NULL;
2933 current_binding_level = NULL_BINDING_LEVEL;
2934 free_binding_level = NULL_BINDING_LEVEL;
2935 pushlevel (0); /* make the binding_level structure for global names */
2936 global_binding_level = current_binding_level;
2938 /* Define `int' and `char' first so that dbx will output them first. */
2940 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2941 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2942 integer_type_node));
2944 /* Define `char', which is like either `signed char' or `unsigned char'
2945 but not the same as either. */
2949 ? make_signed_type (CHAR_TYPE_SIZE)
2950 : make_unsigned_type (CHAR_TYPE_SIZE));
2951 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2954 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2955 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2956 long_integer_type_node));
2958 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2959 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2960 unsigned_type_node));
2962 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2963 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2964 long_unsigned_type_node));
2966 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2967 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2968 long_long_integer_type_node));
2970 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2971 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2972 long_long_unsigned_type_node));
2974 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2975 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2976 short_integer_type_node));
2978 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2979 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2980 short_unsigned_type_node));
2982 /* `unsigned long' is the standard type for sizeof.
2983 Traditionally, use a signed type.
2984 Note that stddef.h uses `unsigned long',
2985 and this must agree, even if long and int are the same size. */
2987 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2988 if (flag_traditional && TREE_UNSIGNED (sizetype))
2989 set_sizetype (signed_type (sizetype));
2992 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2994 error_mark_node = make_node (ERROR_MARK);
2995 TREE_TYPE (error_mark_node) = error_mark_node;
2997 /* Define both `signed char' and `unsigned char'. */
2998 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2999 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3000 signed_char_type_node));
3002 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3003 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3004 unsigned_char_type_node));
3006 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3007 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3009 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3010 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3012 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3013 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3015 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3016 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3018 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3019 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3021 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3022 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3024 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3025 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3027 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3028 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3030 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3031 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3033 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3034 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3036 float_type_node = make_node (REAL_TYPE);
3037 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3038 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3040 layout_type (float_type_node);
3042 double_type_node = make_node (REAL_TYPE);
3043 if (flag_short_double)
3044 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3046 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3047 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3049 layout_type (double_type_node);
3051 long_double_type_node = make_node (REAL_TYPE);
3052 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3053 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3054 long_double_type_node));
3055 layout_type (long_double_type_node);
3057 complex_integer_type_node = make_node (COMPLEX_TYPE);
3058 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3059 complex_integer_type_node));
3060 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3061 layout_type (complex_integer_type_node);
3063 complex_float_type_node = make_node (COMPLEX_TYPE);
3064 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3065 complex_float_type_node));
3066 TREE_TYPE (complex_float_type_node) = float_type_node;
3067 layout_type (complex_float_type_node);
3069 complex_double_type_node = make_node (COMPLEX_TYPE);
3070 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3071 complex_double_type_node));
3072 TREE_TYPE (complex_double_type_node) = double_type_node;
3073 layout_type (complex_double_type_node);
3075 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3076 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3077 complex_long_double_type_node));
3078 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3079 layout_type (complex_long_double_type_node);
3082 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3083 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3084 signed_wchar_type_node = signed_type (wchar_type_node);
3085 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3087 integer_zero_node = build_int_2 (0, 0);
3088 TREE_TYPE (integer_zero_node) = integer_type_node;
3089 integer_one_node = build_int_2 (1, 0);
3090 TREE_TYPE (integer_one_node) = integer_type_node;
3092 boolean_type_node = integer_type_node;
3093 boolean_true_node = integer_one_node;
3094 boolean_false_node = integer_zero_node;
3096 size_zero_node = build_int_2 (0, 0);
3097 TREE_TYPE (size_zero_node) = sizetype;
3098 size_one_node = build_int_2 (1, 0);
3099 TREE_TYPE (size_one_node) = sizetype;
3101 void_type_node = make_node (VOID_TYPE);
3102 pushdecl (build_decl (TYPE_DECL,
3103 ridpointers[(int) RID_VOID], void_type_node));
3104 layout_type (void_type_node); /* Uses integer_zero_node */
3105 /* We are not going to have real types in C with less than byte alignment,
3106 so we might as well not have any types that claim to have it. */
3107 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3109 null_pointer_node = build_int_2 (0, 0);
3110 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3111 layout_type (TREE_TYPE (null_pointer_node));
3113 string_type_node = build_pointer_type (char_type_node);
3114 const_string_type_node
3115 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3117 /* Make a type to be the domain of a few array types
3118 whose domains don't really matter.
3119 200 is small enough that it always fits in size_t
3120 and large enough that it can hold most function names for the
3121 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3122 array_domain_type = build_index_type (build_int_2 (200, 0));
3124 /* make a type for arrays of characters.
3125 With luck nothing will ever really depend on the length of this
3127 char_array_type_node
3128 = build_array_type (char_type_node, array_domain_type);
3129 /* Likewise for arrays of ints. */
3131 = build_array_type (integer_type_node, array_domain_type);
3132 /* This is for wide string constants. */
3133 wchar_array_type_node
3134 = build_array_type (wchar_type_node, array_domain_type);
3136 default_function_type
3137 = build_function_type (integer_type_node, NULL_TREE);
3139 ptr_type_node = build_pointer_type (void_type_node);
3141 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3143 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3146 = build_function_type (void_type_node, NULL_TREE);
3149 = build_function_type (float_type_node,
3150 tree_cons (NULL_TREE, float_type_node, endlink));
3153 = build_function_type (double_type_node,
3154 tree_cons (NULL_TREE, double_type_node, endlink));
3156 ldouble_ftype_ldouble
3157 = build_function_type (long_double_type_node,
3158 tree_cons (NULL_TREE, long_double_type_node,
3161 double_ftype_double_double
3162 = build_function_type (double_type_node,
3163 tree_cons (NULL_TREE, double_type_node,
3164 tree_cons (NULL_TREE,
3165 double_type_node, endlink)));
3168 = build_function_type (integer_type_node,
3169 tree_cons (NULL_TREE, integer_type_node, endlink));
3172 = build_function_type (long_integer_type_node,
3173 tree_cons (NULL_TREE,
3174 long_integer_type_node, endlink));
3176 void_ftype_ptr_ptr_int
3177 = build_function_type (void_type_node,
3178 tree_cons (NULL_TREE, ptr_type_node,
3179 tree_cons (NULL_TREE, ptr_type_node,
3180 tree_cons (NULL_TREE,
3184 int_ftype_cptr_cptr_sizet
3185 = build_function_type (integer_type_node,
3186 tree_cons (NULL_TREE, const_ptr_type_node,
3187 tree_cons (NULL_TREE, const_ptr_type_node,
3188 tree_cons (NULL_TREE,
3192 void_ftype_ptr_int_int
3193 = build_function_type (void_type_node,
3194 tree_cons (NULL_TREE, ptr_type_node,
3195 tree_cons (NULL_TREE, integer_type_node,
3196 tree_cons (NULL_TREE,
3200 string_ftype_ptr_ptr /* strcpy prototype */
3201 = build_function_type (string_type_node,
3202 tree_cons (NULL_TREE, string_type_node,
3203 tree_cons (NULL_TREE,
3204 const_string_type_node,
3207 int_ftype_string_string /* strcmp prototype */
3208 = build_function_type (integer_type_node,
3209 tree_cons (NULL_TREE, const_string_type_node,
3210 tree_cons (NULL_TREE,
3211 const_string_type_node,
3214 strlen_ftype /* strlen prototype */
3215 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3216 tree_cons (NULL_TREE, const_string_type_node,
3219 traditional_ptr_type_node
3220 = (flag_traditional ? string_type_node : ptr_type_node);
3222 memcpy_ftype /* memcpy prototype */
3223 = build_function_type (traditional_ptr_type_node,
3224 tree_cons (NULL_TREE, ptr_type_node,
3225 tree_cons (NULL_TREE, const_ptr_type_node,
3226 tree_cons (NULL_TREE,
3230 memset_ftype /* memset prototype */
3231 = build_function_type (traditional_ptr_type_node,
3232 tree_cons (NULL_TREE, ptr_type_node,
3233 tree_cons (NULL_TREE, integer_type_node,
3234 tree_cons (NULL_TREE,
3238 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3240 = build_function_type (ptr_type_node,
3241 tree_cons (NULL_TREE, ptr_type_node, endlink));
3243 builtin_function ("__builtin_constant_p", default_function_type,
3244 BUILT_IN_CONSTANT_P, NULL_PTR);
3246 builtin_function ("__builtin_return_address",
3247 build_function_type (ptr_type_node,
3248 tree_cons (NULL_TREE,
3251 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3253 builtin_function ("__builtin_frame_address",
3254 build_function_type (ptr_type_node,
3255 tree_cons (NULL_TREE,
3258 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3260 builtin_function ("__builtin_aggregate_incoming_address",
3261 build_function_type (ptr_type_node, NULL_TREE),
3262 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3264 /* Hooks for the DWARF 2 __throw routine. */
3265 builtin_function ("__builtin_unwind_init",
3266 build_function_type (void_type_node, endlink),
3267 BUILT_IN_UNWIND_INIT, NULL_PTR);
3268 builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
3269 builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
3270 builtin_function ("__builtin_dwarf_fp_regnum",
3271 build_function_type (unsigned_type_node, endlink),
3272 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3273 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3274 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3275 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3276 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3277 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3278 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3279 builtin_function ("__builtin_set_return_addr_reg",
3280 build_function_type (void_type_node,
3281 tree_cons (NULL_TREE,
3284 BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
3285 builtin_function ("__builtin_eh_stub_old", ptr_ftype_void,
3286 BUILT_IN_EH_STUB_OLD, NULL_PTR);
3287 builtin_function ("__builtin_eh_stub", ptr_ftype_void,
3288 BUILT_IN_EH_STUB, NULL_PTR);
3290 ("__builtin_set_eh_regs",
3291 build_function_type (void_type_node,
3292 tree_cons (NULL_TREE, ptr_type_node,
3293 tree_cons (NULL_TREE,
3294 type_for_mode (ptr_mode, 0),
3296 BUILT_IN_SET_EH_REGS, NULL_PTR);
3298 builtin_function ("__builtin_alloca",
3299 build_function_type (ptr_type_node,
3300 tree_cons (NULL_TREE,
3303 BUILT_IN_ALLOCA, "alloca");
3304 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3305 /* Define alloca, ffs as builtins.
3306 Declare _exit just to mark it as volatile. */
3307 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3309 temp = builtin_function ("alloca",
3310 build_function_type (ptr_type_node,
3311 tree_cons (NULL_TREE,
3314 BUILT_IN_ALLOCA, NULL_PTR);
3315 /* Suppress error if redefined as a non-function. */
3316 DECL_BUILT_IN_NONANSI (temp) = 1;
3317 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3318 /* Suppress error if redefined as a non-function. */
3319 DECL_BUILT_IN_NONANSI (temp) = 1;
3320 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3322 TREE_THIS_VOLATILE (temp) = 1;
3323 TREE_SIDE_EFFECTS (temp) = 1;
3324 /* Suppress error if redefined as a non-function. */
3325 DECL_BUILT_IN_NONANSI (temp) = 1;
3328 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3329 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3331 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3333 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3335 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3337 builtin_function ("__builtin_saveregs",
3338 build_function_type (ptr_type_node, NULL_TREE),
3339 BUILT_IN_SAVEREGS, NULL_PTR);
3340 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3342 builtin_function ("__builtin_varargs",
3343 build_function_type (ptr_type_node,
3344 tree_cons (NULL_TREE,
3347 BUILT_IN_VARARGS, NULL_PTR);
3349 builtin_function ("__builtin_classify_type", default_function_type,
3350 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3351 builtin_function ("__builtin_next_arg",
3352 build_function_type (ptr_type_node, NULL_TREE),
3353 BUILT_IN_NEXT_ARG, NULL_PTR);
3354 builtin_function ("__builtin_args_info",
3355 build_function_type (integer_type_node,
3356 tree_cons (NULL_TREE,
3359 BUILT_IN_ARGS_INFO, NULL_PTR);
3361 /* Untyped call and return. */
3362 builtin_function ("__builtin_apply_args",
3363 build_function_type (ptr_type_node, NULL_TREE),
3364 BUILT_IN_APPLY_ARGS, NULL_PTR);
3366 temp = tree_cons (NULL_TREE,
3367 build_pointer_type (build_function_type (void_type_node,
3369 tree_cons (NULL_TREE,
3371 tree_cons (NULL_TREE,
3374 builtin_function ("__builtin_apply",
3375 build_function_type (ptr_type_node, temp),
3376 BUILT_IN_APPLY, NULL_PTR);
3377 builtin_function ("__builtin_return",
3378 build_function_type (void_type_node,
3379 tree_cons (NULL_TREE,
3382 BUILT_IN_RETURN, NULL_PTR);
3384 /* Currently under experimentation. */
3385 builtin_function ("__builtin_memcpy", memcpy_ftype,
3386 BUILT_IN_MEMCPY, "memcpy");
3387 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3388 BUILT_IN_MEMCMP, "memcmp");
3389 builtin_function ("__builtin_memset", memset_ftype,
3390 BUILT_IN_MEMSET, "memset");
3391 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3392 BUILT_IN_STRCMP, "strcmp");
3393 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3394 BUILT_IN_STRCPY, "strcpy");
3395 builtin_function ("__builtin_strlen", strlen_ftype,
3396 BUILT_IN_STRLEN, "strlen");
3397 builtin_function ("__builtin_sqrtf", float_ftype_float,
3398 BUILT_IN_FSQRT, "sqrtf");
3399 builtin_function ("__builtin_fsqrt", double_ftype_double,
3400 BUILT_IN_FSQRT, "sqrt");
3401 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3402 BUILT_IN_FSQRT, "sqrtl");
3403 builtin_function ("__builtin_sinf", float_ftype_float,
3404 BUILT_IN_SIN, "sinf");
3405 builtin_function ("__builtin_sin", double_ftype_double,
3406 BUILT_IN_SIN, "sin");
3407 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3408 BUILT_IN_SIN, "sinl");
3409 builtin_function ("__builtin_cosf", float_ftype_float,
3410 BUILT_IN_COS, "cosf");
3411 builtin_function ("__builtin_cos", double_ftype_double,
3412 BUILT_IN_COS, "cos");
3413 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3414 BUILT_IN_COS, "cosl");
3415 builtin_function ("__builtin_setjmp",
3416 build_function_type (integer_type_node,
3417 tree_cons (NULL_TREE,
3418 ptr_type_node, endlink)),
3419 BUILT_IN_SETJMP, NULL_PTR);
3420 builtin_function ("__builtin_longjmp",
3423 tree_cons (NULL, ptr_type_node,
3424 tree_cons (NULL_TREE,
3427 BUILT_IN_LONGJMP, NULL_PTR);
3429 /* In an ANSI C program, it is okay to supply built-in meanings
3430 for these functions, since applications cannot validly use them
3431 with any other meaning.
3432 However, honor the -fno-builtin option. */
3433 if (!flag_no_builtin)
3435 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3436 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3437 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3438 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3440 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3441 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3442 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3444 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3445 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3447 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3449 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3450 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3451 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3452 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3454 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3455 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3456 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3457 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3458 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3459 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3461 /* Declare these functions volatile
3462 to avoid spurious "control drops through" warnings. */
3463 /* Don't specify the argument types, to avoid errors
3464 from certain code which isn't valid in ANSI but which exists. */
3465 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3467 TREE_THIS_VOLATILE (temp) = 1;
3468 TREE_SIDE_EFFECTS (temp) = 1;
3469 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3470 TREE_THIS_VOLATILE (temp) = 1;
3471 TREE_SIDE_EFFECTS (temp) = 1;
3475 /* Support for these has not been written in either expand_builtin
3476 or build_function_call. */
3477 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3478 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3479 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3481 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3483 builtin_function ("__builtin_fmod", double_ftype_double_double,
3484 BUILT_IN_FMOD, NULL_PTR);
3485 builtin_function ("__builtin_frem", double_ftype_double_double,
3486 BUILT_IN_FREM, NULL_PTR);
3487 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3489 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3493 pedantic_lvalues = pedantic;
3495 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3496 declare_function_name ();
3498 start_identifier_warnings ();
3500 /* Prepare to check format strings against argument lists. */
3501 init_function_format_info ();
3505 incomplete_decl_finalize_hook = finish_incomplete_decl;
3508 /* Return a definition for a builtin function named NAME and whose data type
3509 is TYPE. TYPE should be a function type with argument types.
3510 FUNCTION_CODE tells later passes how to compile calls to this function.
3511 See tree.h for its possible values.
3513 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3514 the name to be called if we can't opencode the function. */
3517 builtin_function (name, type, function_code, library_name)
3520 enum built_in_function function_code;
3523 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3524 DECL_EXTERNAL (decl) = 1;
3525 TREE_PUBLIC (decl) = 1;
3526 /* If -traditional, permit redefining a builtin function any way you like.
3527 (Though really, if the program redefines these functions,
3528 it probably won't work right unless compiled with -fno-builtin.) */
3529 if (flag_traditional && name[0] != '_')
3530 DECL_BUILT_IN_NONANSI (decl) = 1;
3532 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3533 make_decl_rtl (decl, NULL_PTR, 1);
3535 if (function_code != NOT_BUILT_IN)
3537 DECL_BUILT_IN (decl) = 1;
3538 DECL_FUNCTION_CODE (decl) = function_code;
3540 /* Warn if a function in the namespace for users
3541 is used without an occasion to consider it declared. */
3542 if (name[0] != '_' || name[1] != '_')
3543 C_DECL_ANTICIPATED (decl) = 1;
3548 /* Called when a declaration is seen that contains no names to declare.
3549 If its type is a reference to a structure, union or enum inherited
3550 from a containing scope, shadow that tag name for the current scope
3551 with a forward reference.
3552 If its type defines a new named structure or union
3553 or defines an enum, it is valid but we need not do anything here.
3554 Otherwise, it is an error. */
3557 shadow_tag (declspecs)
3560 shadow_tag_warned (declspecs, 0);
3564 shadow_tag_warned (declspecs, warned)
3567 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3574 pending_invalid_xref = 0;
3576 /* Remove the attributes from declspecs, since they will confuse the
3578 split_specs_attrs (declspecs, &specs, &attrs);
3580 for (link = declspecs; link; link = TREE_CHAIN (link))
3582 register tree value = TREE_VALUE (link);
3583 register enum tree_code code = TREE_CODE (value);
3585 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3586 /* Used to test also that TYPE_SIZE (value) != 0.
3587 That caused warning for `struct foo;' at top level in the file. */
3589 register tree name = lookup_tag_reverse (value);
3596 if (warned != 1 && code != ENUMERAL_TYPE)
3597 /* Empty unnamed enum OK */
3599 pedwarn ("unnamed struct/union that defines no instances");
3605 t = lookup_tag (code, name, current_binding_level, 1);
3609 t = make_node (code);
3616 if (!warned && ! in_system_header)
3618 warning ("useless keyword or type name in empty declaration");
3625 error ("two types specified in one empty declaration");
3630 pedwarn ("empty declaration");
3634 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3637 groktypename (typename)
3640 if (TREE_CODE (typename) != TREE_LIST)
3642 return grokdeclarator (TREE_VALUE (typename),
3643 TREE_PURPOSE (typename),
3647 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3650 groktypename_in_parm_context (typename)
3653 if (TREE_CODE (typename) != TREE_LIST)
3655 return grokdeclarator (TREE_VALUE (typename),
3656 TREE_PURPOSE (typename),
3660 /* Decode a declarator in an ordinary declaration or data definition.
3661 This is called as soon as the type information and variable name
3662 have been parsed, before parsing the initializer if any.
3663 Here we create the ..._DECL node, fill in its type,
3664 and put it on the list of decls for the current context.
3665 The ..._DECL node is returned as the value.
3667 Exception: for arrays where the length is not specified,
3668 the type is left null, to be filled in by `finish_decl'.
3670 Function definitions do not come here; they go to start_function
3671 instead. However, external and forward declarations of functions
3672 do go through here. Structure field declarations are done by
3673 grokfield and not through here. */
3675 /* Set this to zero to debug not using the temporary obstack
3676 to parse initializers. */
3677 int debug_temp_inits = 1;
3680 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3681 tree declarator, declspecs;
3683 tree attributes, prefix_attributes;
3685 register tree decl = grokdeclarator (declarator, declspecs,
3686 NORMAL, initialized);
3688 int init_written = initialized;
3690 /* The corresponding pop_obstacks is in finish_decl. */
3691 push_obstacks_nochange ();
3693 if (warn_main && !strcmp (IDENTIFIER_POINTER (declarator), "main"))
3694 warning_with_decl (decl, "`%s' is usually a function");
3697 /* Is it valid for this decl to have an initializer at all?
3698 If not, set INITIALIZED to zero, which will indirectly
3699 tell `finish_decl' to ignore the initializer once it is parsed. */
3700 switch (TREE_CODE (decl))
3703 /* typedef foo = bar means give foo the same type as bar.
3704 We haven't parsed bar yet, so `finish_decl' will fix that up.
3705 Any other case of an initialization in a TYPE_DECL is an error. */
3706 if (pedantic || list_length (declspecs) > 1)
3708 error ("typedef `%s' is initialized",
3709 IDENTIFIER_POINTER (DECL_NAME (decl)));
3715 error ("function `%s' is initialized like a variable",
3716 IDENTIFIER_POINTER (DECL_NAME (decl)));
3721 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3722 error ("parameter `%s' is initialized",
3723 IDENTIFIER_POINTER (DECL_NAME (decl)));
3728 /* Don't allow initializations for incomplete types
3729 except for arrays which might be completed by the initialization. */
3730 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3732 /* A complete type is ok if size is fixed. */
3734 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3735 || C_DECL_VARIABLE_SIZE (decl))
3737 error ("variable-sized object may not be initialized");
3741 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3743 error ("variable `%s' has initializer but incomplete type",
3744 IDENTIFIER_POINTER (DECL_NAME (decl)));
3747 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3749 error ("elements of array `%s' have incomplete type",
3750 IDENTIFIER_POINTER (DECL_NAME (decl)));
3757 #if 0 /* Seems redundant with grokdeclarator. */
3758 if (current_binding_level != global_binding_level
3759 && DECL_EXTERNAL (decl)
3760 && TREE_CODE (decl) != FUNCTION_DECL)
3761 warning ("declaration of `%s' has `extern' and is initialized",
3762 IDENTIFIER_POINTER (DECL_NAME (decl)));
3764 DECL_EXTERNAL (decl) = 0;
3765 if (current_binding_level == global_binding_level)
3766 TREE_STATIC (decl) = 1;
3768 /* Tell `pushdecl' this is an initialized decl
3769 even though we don't yet have the initializer expression.
3770 Also tell `finish_decl' it may store the real initializer. */
3771 DECL_INITIAL (decl) = error_mark_node;
3774 /* If this is a function declaration, write a record describing it to the
3775 prototypes file (if requested). */
3777 if (TREE_CODE (decl) == FUNCTION_DECL)
3778 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3780 /* ANSI specifies that a tentative definition which is not merged with
3781 a non-tentative definition behaves exactly like a definition with an
3782 initializer equal to zero. (Section 3.7.2)
3783 -fno-common gives strict ANSI behavior. Usually you don't want it.
3784 This matters only for variables with external linkage. */
3785 if (! flag_no_common || ! TREE_PUBLIC (decl))
3786 DECL_COMMON (decl) = 1;
3788 /* Set attributes here so if duplicate decl, will have proper attributes. */
3789 decl_attributes (decl, attributes, prefix_attributes);
3791 /* Add this decl to the current binding level.
3792 TEM may equal DECL or it may be a previous decl of the same name. */
3793 tem = pushdecl (decl);
3795 /* For a local variable, define the RTL now. */
3796 if (current_binding_level != global_binding_level
3797 /* But not if this is a duplicate decl
3798 and we preserved the rtl from the previous one
3799 (which may or may not happen). */
3800 && DECL_RTL (tem) == 0)
3802 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3804 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3805 && DECL_INITIAL (tem) != 0)
3811 /* When parsing and digesting the initializer,
3812 use temporary storage. Do this even if we will ignore the value. */
3813 if (current_binding_level == global_binding_level && debug_temp_inits)
3814 temporary_allocation ();
3820 /* Finish processing of a declaration;
3821 install its initial value.
3822 If the length of an array type is not known before,
3823 it must be determined now, from the initial value, or it is an error. */
3826 finish_decl (decl, init, asmspec_tree)
3830 register tree type = TREE_TYPE (decl);
3831 int was_incomplete = (DECL_SIZE (decl) == 0);
3832 int temporary = allocation_temporary_p ();
3835 /* If a name was specified, get the string. */
3837 asmspec = TREE_STRING_POINTER (asmspec_tree);
3839 /* If `start_decl' didn't like having an initialization, ignore it now. */
3841 if (init != 0 && DECL_INITIAL (decl) == 0)
3843 /* Don't crash if parm is initialized. */
3844 if (TREE_CODE (decl) == PARM_DECL)
3847 if (ITERATOR_P (decl))
3850 error_with_decl (decl, "iterator has no initial value");
3852 init = save_expr (init);
3857 if (TREE_CODE (decl) != TYPE_DECL)
3858 store_init_value (decl, init);
3861 /* typedef foo = bar; store the type of bar as the type of foo. */
3862 TREE_TYPE (decl) = TREE_TYPE (init);
3863 DECL_INITIAL (decl) = init = 0;
3867 /* Pop back to the obstack that is current for this binding level.
3868 This is because MAXINDEX, rtl, etc. to be made below
3869 must go in the permanent obstack. But don't discard the
3870 temporary data yet. */
3872 #if 0 /* pop_obstacks was near the end; this is what was here. */
3873 if (current_binding_level == global_binding_level && temporary)
3874 end_temporary_allocation ();
3877 /* Deduce size of array from initialization, if not already known */
3879 if (TREE_CODE (type) == ARRAY_TYPE
3880 && TYPE_DOMAIN (type) == 0
3881 && TREE_CODE (decl) != TYPE_DECL)
3884 = (TREE_STATIC (decl)
3885 /* Even if pedantic, an external linkage array
3886 may have incomplete type at first. */
3887 ? pedantic && !TREE_PUBLIC (decl)
3888 : !DECL_EXTERNAL (decl));
3890 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3892 /* Get the completed type made by complete_array_type. */
3893 type = TREE_TYPE (decl);
3896 error_with_decl (decl, "initializer fails to determine size of `%s'");
3901 error_with_decl (decl, "array size missing in `%s'");
3902 /* If a `static' var's size isn't known,
3903 make it extern as well as static, so it does not get
3905 If it is not `static', then do not mark extern;
3906 finish_incomplete_decl will give it a default size
3907 and it will get allocated. */
3908 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3909 DECL_EXTERNAL (decl) = 1;
3912 /* TYPE_MAX_VALUE is always one less than the number of elements
3913 in the array, because we start counting at zero. Therefore,
3914 warn only if the value is less than zero. */
3915 if (pedantic && TYPE_DOMAIN (type) != 0
3916 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3917 error_with_decl (decl, "zero or negative size array `%s'");
3919 layout_decl (decl, 0);
3922 if (TREE_CODE (decl) == VAR_DECL)
3924 if (DECL_SIZE (decl) == 0
3925 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3926 layout_decl (decl, 0);
3928 if (DECL_SIZE (decl) == 0
3929 && (TREE_STATIC (decl)
3931 /* A static variable with an incomplete type
3932 is an error if it is initialized.
3933 Also if it is not file scope.
3934 Otherwise, let it through, but if it is not `extern'
3935 then it may cause an error message later. */
3936 /* A duplicate_decls call could have changed an extern
3937 declaration into a file scope one. This can be detected
3938 by TREE_ASM_WRITTEN being set. */
3939 (DECL_INITIAL (decl) != 0
3940 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3942 /* An automatic variable with an incomplete type
3944 !DECL_EXTERNAL (decl)))
3946 error_with_decl (decl, "storage size of `%s' isn't known");
3947 TREE_TYPE (decl) = error_mark_node;
3950 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3951 && DECL_SIZE (decl) != 0)
3953 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3954 constant_expression_warning (DECL_SIZE (decl));
3956 error_with_decl (decl, "storage size of `%s' isn't constant");
3959 if (TREE_USED (type))
3960 TREE_USED (decl) = 1;
3963 /* If this is a function and an assembler name is specified, it isn't
3964 builtin any more. Also reset DECL_RTL so we can give it its new
3966 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3968 DECL_BUILT_IN (decl) = 0;
3969 DECL_RTL (decl) = 0;
3972 /* Output the assembler code and/or RTL code for variables and functions,
3973 unless the type is an undefined structure or union.
3974 If not, it will get done when the type is completed. */
3976 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3978 if ((flag_traditional || TREE_PERMANENT (decl))
3979 && allocation_temporary_p ())
3981 push_obstacks_nochange ();
3982 end_temporary_allocation ();
3983 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3984 maybe_objc_check_decl (decl);
3985 rest_of_decl_compilation (decl, asmspec,
3986 (DECL_CONTEXT (decl) == 0
3987 || TREE_ASM_WRITTEN (decl)),
3993 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3994 maybe_objc_check_decl (decl);
3995 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3998 if (DECL_CONTEXT (decl) != 0)
4000 /* Recompute the RTL of a local array now
4001 if it used to be an incomplete type. */
4003 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4005 /* If we used it already as memory, it must stay in memory. */
4006 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4007 /* If it's still incomplete now, no init will save it. */
4008 if (DECL_SIZE (decl) == 0)
4009 DECL_INITIAL (decl) = 0;
4012 /* Compute and store the initial value. */
4013 if (TREE_CODE (decl) != FUNCTION_DECL)
4014 expand_decl_init (decl);
4018 if (TREE_CODE (decl) == TYPE_DECL)
4020 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4021 maybe_objc_check_decl (decl);
4022 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4026 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4027 /* This test used to include TREE_PERMANENT, however, we have the same
4028 problem with initializers at the function level. Such initializers get
4029 saved until the end of the function on the momentary_obstack. */
4030 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4032 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4033 space with DECL_ARG_TYPE. */
4034 && TREE_CODE (decl) != PARM_DECL)
4036 /* We need to remember that this array HAD an initialization,
4037 but discard the actual temporary nodes,
4038 since we can't have a permanent node keep pointing to them. */
4039 /* We make an exception for inline functions, since it's
4040 normal for a local extern redeclaration of an inline function
4041 to have a copy of the top-level decl's DECL_INLINE. */
4042 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4044 /* If this is a const variable, then preserve the
4045 initializer instead of discarding it so that we can optimize
4046 references to it. */
4047 /* This test used to include TREE_STATIC, but this won't be set
4048 for function level initializers. */
4049 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4051 preserve_initializer ();
4052 /* Hack? Set the permanent bit for something that is permanent,
4053 but not on the permanent obstack, so as to convince
4054 output_constant_def to make its rtl on the permanent
4056 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4058 /* The initializer and DECL must have the same (or equivalent
4059 types), but if the initializer is a STRING_CST, its type
4060 might not be on the right obstack, so copy the type
4062 TREE_TYPE (DECL_INITIAL (decl)) = type;
4065 DECL_INITIAL (decl) = error_mark_node;
4069 /* If requested, warn about definitions of large data objects. */
4071 if (warn_larger_than
4072 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4073 && !DECL_EXTERNAL (decl))
4075 register tree decl_size = DECL_SIZE (decl);
4077 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4079 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4081 if (units > larger_than_size)
4082 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4087 /* Resume permanent allocation, if not within a function. */
4088 /* The corresponding push_obstacks_nochange is in start_decl,
4089 and in push_parm_decl and in grokfield. */
4093 /* If we have gone back from temporary to permanent allocation,
4094 actually free the temporary space that we no longer need. */
4095 if (temporary && !allocation_temporary_p ())
4096 permanent_allocation (0);
4098 /* At the end of a declaration, throw away any variable type sizes
4099 of types defined inside that declaration. There is no use
4100 computing them in the following function definition. */
4101 if (current_binding_level == global_binding_level)
4102 get_pending_sizes ();
4105 /* If DECL has a cleanup, build and return that cleanup here.
4106 This is a callback called by expand_expr. */
4109 maybe_build_cleanup (decl)
4110 tree decl ATTRIBUTE_UNUSED;
4112 /* There are no cleanups in C. */
4116 /* Given a parsed parameter declaration,
4117 decode it into a PARM_DECL and push that on the current binding level.
4118 Also, for the sake of forward parm decls,
4119 record the given order of parms in `parm_order'. */
4122 push_parm_decl (parm)
4126 int old_immediate_size_expand = immediate_size_expand;
4127 /* Don't try computing parm sizes now -- wait till fn is called. */
4128 immediate_size_expand = 0;
4130 /* The corresponding pop_obstacks is in finish_decl. */
4131 push_obstacks_nochange ();
4133 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4134 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4135 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4136 TREE_PURPOSE (TREE_VALUE (parm)));
4139 if (DECL_NAME (decl))
4142 olddecl = lookup_name (DECL_NAME (decl));
4143 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4144 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4148 decl = pushdecl (decl);
4150 immediate_size_expand = old_immediate_size_expand;
4152 current_binding_level->parm_order
4153 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4155 /* Add this decl to the current binding level. */
4156 finish_decl (decl, NULL_TREE, NULL_TREE);
4159 /* Clear the given order of parms in `parm_order'.
4160 Used at start of parm list,
4161 and also at semicolon terminating forward decls. */
4166 current_binding_level->parm_order = NULL_TREE;
4169 /* Make TYPE a complete type based on INITIAL_VALUE.
4170 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4171 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4174 complete_array_type (type, initial_value, do_default)
4179 register tree maxindex = NULL_TREE;
4184 /* Note MAXINDEX is really the maximum index,
4185 one less than the size. */
4186 if (TREE_CODE (initial_value) == STRING_CST)
4189 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4190 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4193 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4195 tree elts = CONSTRUCTOR_ELTS (initial_value);
4196 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4197 for (; elts; elts = TREE_CHAIN (elts))
4199 if (TREE_PURPOSE (elts))
4200 maxindex = TREE_PURPOSE (elts);
4202 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4204 maxindex = copy_node (maxindex);
4208 /* Make an error message unless that happened already. */
4209 if (initial_value != error_mark_node)
4212 /* Prevent further error messages. */
4213 maxindex = build_int_2 (0, 0);
4220 maxindex = build_int_2 (0, 0);
4226 TYPE_DOMAIN (type) = build_index_type (maxindex);
4227 if (!TREE_TYPE (maxindex))
4228 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4231 /* Lay out the type now that we can get the real answer. */
4238 /* Given declspecs and a declarator,
4239 determine the name and type of the object declared
4240 and construct a ..._DECL node for it.
4241 (In one case we can return a ..._TYPE node instead.
4242 For invalid input we sometimes return 0.)
4244 DECLSPECS is a chain of tree_list nodes whose value fields
4245 are the storage classes and type specifiers.
4247 DECL_CONTEXT says which syntactic context this declaration is in:
4248 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4249 FUNCDEF for a function definition. Like NORMAL but a few different
4250 error messages in each case. Return value may be zero meaning
4251 this definition is too screwy to try to parse.
4252 PARM for a parameter declaration (either within a function prototype
4253 or before a function body). Make a PARM_DECL, or return void_type_node.
4254 TYPENAME if for a typename (in a cast or sizeof).
4255 Don't make a DECL node; just return the ..._TYPE node.
4256 FIELD for a struct or union field; make a FIELD_DECL.
4257 BITFIELD for a field with specified width.
4258 INITIALIZED is 1 if the decl has an initializer.
4260 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4261 It may also be so in the PARM case, for a prototype where the
4262 argument type is specified but not the name.
4264 This function is where the complicated C meanings of `static'
4265 and `extern' are interpreted. */
4268 grokdeclarator (declarator, declspecs, decl_context, initialized)
4271 enum decl_context decl_context;
4276 tree type = NULL_TREE;
4281 int explicit_int = 0;
4282 int explicit_char = 0;
4283 int defaulted_int = 0;
4284 tree typedef_decl = 0;
4286 tree typedef_type = 0;
4287 int funcdef_flag = 0;
4288 enum tree_code innermost_code = ERROR_MARK;
4290 int size_varies = 0;
4291 tree decl_machine_attr = NULL_TREE;
4293 if (decl_context == BITFIELD)
4294 bitfield = 1, decl_context = FIELD;
4296 if (decl_context == FUNCDEF)
4297 funcdef_flag = 1, decl_context = NORMAL;
4299 push_obstacks_nochange ();
4301 if (flag_traditional && allocation_temporary_p ())
4302 end_temporary_allocation ();
4304 /* Look inside a declarator for the name being declared
4305 and get it as a string, for an error message. */
4307 register tree decl = declarator;
4311 switch (TREE_CODE (decl))
4316 innermost_code = TREE_CODE (decl);
4317 decl = TREE_OPERAND (decl, 0);
4320 case IDENTIFIER_NODE:
4321 name = IDENTIFIER_POINTER (decl);
4332 /* A function definition's declarator must have the form of
4333 a function declarator. */
4335 if (funcdef_flag && innermost_code != CALL_EXPR)
4338 /* Anything declared one level down from the top level
4339 must be one of the parameters of a function
4340 (because the body is at least two levels down). */
4342 /* If this looks like a function definition, make it one,
4343 even if it occurs where parms are expected.
4344 Then store_parm_decls will reject it and not use it as a parm. */
4345 if (decl_context == NORMAL && !funcdef_flag
4346 && current_binding_level->parm_flag)
4347 decl_context = PARM;
4349 /* Look through the decl specs and record which ones appear.
4350 Some typespecs are defined as built-in typenames.
4351 Others, the ones that are modifiers of other types,
4352 are represented by bits in SPECBITS: set the bits for
4353 the modifiers that appear. Storage class keywords are also in SPECBITS.
4355 If there is a typedef name or a type, store the type in TYPE.
4356 This includes builtin typedefs such as `int'.
4358 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4359 and did not come from a user typedef.
4361 Set LONGLONG if `long' is mentioned twice. */
4363 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4366 register tree id = TREE_VALUE (spec);
4368 if (id == ridpointers[(int) RID_INT])
4370 if (id == ridpointers[(int) RID_CHAR])
4373 if (TREE_CODE (id) == IDENTIFIER_NODE)
4374 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4376 if (ridpointers[i] == id)
4378 if (i == (int) RID_LONG && specbits & (1<<i))
4381 error ("`long long long' is too long for GCC");
4384 if (pedantic && ! in_system_header)
4385 pedwarn ("ANSI C does not support `long long'");
4389 else if (specbits & (1 << i))
4390 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4396 error ("two or more data types in declaration of `%s'", name);
4397 /* Actual typedefs come to us as TYPE_DECL nodes. */
4398 else if (TREE_CODE (id) == TYPE_DECL)
4400 type = TREE_TYPE (id);
4401 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4404 /* Built-in types come as identifiers. */
4405 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4407 register tree t = lookup_name (id);
4408 if (TREE_TYPE (t) == error_mark_node)
4410 else if (!t || TREE_CODE (t) != TYPE_DECL)
4411 error ("`%s' fails to be a typedef or built in type",
4412 IDENTIFIER_POINTER (id));
4415 type = TREE_TYPE (t);
4419 else if (TREE_CODE (id) != ERROR_MARK)
4425 typedef_type = type;
4427 size_varies = C_TYPE_VARIABLE_SIZE (type);
4429 /* No type at all: default to `int', and set DEFAULTED_INT
4430 because it was not a user-defined typedef. */
4434 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4435 | (1 << (int) RID_SIGNED)
4436 | (1 << (int) RID_UNSIGNED))))
4437 && ! (in_system_header && ! allocation_temporary_p ()))
4439 /* C9x will probably require a diagnostic here.
4440 For now, issue a warning if -Wreturn-type and this is a function,
4441 or if -Wimplicit; prefer the former warning since it is more
4443 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4444 warn_about_return_type = 1;
4445 else if (warn_implicit_int)
4446 warning ("type defaults to `int' in declaration of `%s'", name);
4450 type = integer_type_node;
4453 /* Now process the modifiers that were specified
4454 and check for invalid combinations. */
4456 /* Long double is a special combination. */
4458 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4459 && TYPE_MAIN_VARIANT (type) == double_type_node)
4461 specbits &= ~ (1 << (int) RID_LONG);
4462 type = long_double_type_node;
4465 /* Check all other uses of type modifiers. */
4467 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4468 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4472 if ((specbits & 1 << (int) RID_LONG)
4473 && (specbits & 1 << (int) RID_SHORT))
4474 error ("both long and short specified for `%s'", name);
4475 else if (((specbits & 1 << (int) RID_LONG)
4476 || (specbits & 1 << (int) RID_SHORT))
4478 error ("long or short specified with char for `%s'", name);
4479 else if (((specbits & 1 << (int) RID_LONG)
4480 || (specbits & 1 << (int) RID_SHORT))
4481 && TREE_CODE (type) == REAL_TYPE)
4483 static int already = 0;
4485 error ("long or short specified with floating type for `%s'", name);
4486 if (! already && ! pedantic)
4488 error ("the only valid combination is `long double'");
4492 else if ((specbits & 1 << (int) RID_SIGNED)
4493 && (specbits & 1 << (int) RID_UNSIGNED))
4494 error ("both signed and unsigned specified for `%s'", name);
4495 else if (TREE_CODE (type) != INTEGER_TYPE)
4496 error ("long, short, signed or unsigned invalid for `%s'", name);
4500 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4502 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4504 if (flag_pedantic_errors)
4509 /* Discard the type modifiers if they are invalid. */
4512 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4513 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4518 if ((specbits & (1 << (int) RID_COMPLEX))
4519 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4521 error ("complex invalid for `%s'", name);
4522 specbits &= ~ (1 << (int) RID_COMPLEX);
4525 /* Decide whether an integer type is signed or not.
4526 Optionally treat bitfields as signed by default. */
4527 if (specbits & 1 << (int) RID_UNSIGNED
4528 /* Traditionally, all bitfields are unsigned. */
4529 || (bitfield && flag_traditional
4530 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4531 || (bitfield && ! flag_signed_bitfields
4532 && (explicit_int || defaulted_int || explicit_char
4533 /* A typedef for plain `int' without `signed'
4534 can be controlled just like plain `int'. */
4535 || ! (typedef_decl != 0
4536 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4537 && TREE_CODE (type) != ENUMERAL_TYPE
4538 && !(specbits & 1 << (int) RID_SIGNED)))
4541 type = long_long_unsigned_type_node;
4542 else if (specbits & 1 << (int) RID_LONG)
4543 type = long_unsigned_type_node;
4544 else if (specbits & 1 << (int) RID_SHORT)
4545 type = short_unsigned_type_node;
4546 else if (type == char_type_node)
4547 type = unsigned_char_type_node;
4548 else if (typedef_decl)
4549 type = unsigned_type (type);
4551 type = unsigned_type_node;
4553 else if ((specbits & 1 << (int) RID_SIGNED)
4554 && type == char_type_node)
4555 type = signed_char_type_node;
4557 type = long_long_integer_type_node;
4558 else if (specbits & 1 << (int) RID_LONG)
4559 type = long_integer_type_node;
4560 else if (specbits & 1 << (int) RID_SHORT)
4561 type = short_integer_type_node;
4563 if (specbits & 1 << (int) RID_COMPLEX)
4565 /* If we just have "complex", it is equivalent to
4566 "complex double", but if any modifiers at all are specified it is
4567 the complex form of TYPE. E.g, "complex short" is
4568 "complex short int". */
4570 if (defaulted_int && ! longlong
4571 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4572 | (1 << (int) RID_SIGNED)
4573 | (1 << (int) RID_UNSIGNED))))
4574 type = complex_double_type_node;
4575 else if (type == integer_type_node)
4576 type = complex_integer_type_node;
4577 else if (type == float_type_node)
4578 type = complex_float_type_node;
4579 else if (type == double_type_node)
4580 type = complex_double_type_node;
4581 else if (type == long_double_type_node)
4582 type = complex_long_double_type_node;
4584 type = build_complex_type (type);
4587 /* Set CONSTP if this declaration is `const', whether by
4588 explicit specification or via a typedef.
4589 Likewise for VOLATILEP. */
4591 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4592 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4593 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4595 pedwarn ("duplicate `const'");
4597 pedwarn ("duplicate `volatile'");
4598 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4599 type = TYPE_MAIN_VARIANT (type);
4601 /* Warn if two storage classes are given. Default to `auto'. */
4606 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4607 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4608 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4609 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4610 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4611 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4613 /* Warn about storage classes that are invalid for certain
4614 kinds of declarations (parameters, typenames, etc.). */
4617 error ("multiple storage classes in declaration of `%s'", name);
4618 else if (funcdef_flag
4620 & ((1 << (int) RID_REGISTER)
4621 | (1 << (int) RID_AUTO)
4622 | (1 << (int) RID_TYPEDEF))))
4624 if (specbits & 1 << (int) RID_AUTO
4625 && (pedantic || current_binding_level == global_binding_level))
4626 pedwarn ("function definition declared `auto'");
4627 if (specbits & 1 << (int) RID_REGISTER)
4628 error ("function definition declared `register'");
4629 if (specbits & 1 << (int) RID_TYPEDEF)
4630 error ("function definition declared `typedef'");
4631 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4632 | (1 << (int) RID_AUTO));
4634 else if (decl_context != NORMAL && nclasses > 0)
4636 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4640 error ((decl_context == FIELD
4641 ? "storage class specified for structure field `%s'"
4642 : (decl_context == PARM
4643 ? "storage class specified for parameter `%s'"
4644 : "storage class specified for typename")),
4646 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4647 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4648 | (1 << (int) RID_EXTERN));
4651 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4653 /* `extern' with initialization is invalid if not at top level. */
4654 if (current_binding_level == global_binding_level)
4655 warning ("`%s' initialized and declared `extern'", name);
4657 error ("`%s' has both `extern' and initializer", name);
4659 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4660 && current_binding_level != global_binding_level)
4661 error ("nested function `%s' declared `extern'", name);
4662 else if (current_binding_level == global_binding_level
4663 && specbits & (1 << (int) RID_AUTO))
4664 error ("top-level declaration of `%s' specifies `auto'", name);
4665 else if ((specbits & 1 << (int) RID_ITERATOR)
4666 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4668 error ("iterator `%s' has derived type", name);
4669 type = error_mark_node;
4671 else if ((specbits & 1 << (int) RID_ITERATOR)
4672 && TREE_CODE (type) != INTEGER_TYPE)
4674 error ("iterator `%s' has noninteger type", name);
4675 type = error_mark_node;
4679 /* Now figure out the structure of the declarator proper.
4680 Descend through it, creating more complex types, until we reach
4681 the declared identifier (or NULL_TREE, in an absolute declarator). */
4683 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4685 if (type == error_mark_node)
4687 declarator = TREE_OPERAND (declarator, 0);
4691 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4692 an INDIRECT_REF (for *...),
4693 a CALL_EXPR (for ...(...)),
4694 an identifier (for the name being declared)
4695 or a null pointer (for the place in an absolute declarator
4696 where the name was omitted).
4697 For the last two cases, we have just exited the loop.
4699 At this point, TYPE is the type of elements of an array,
4700 or for a function to return, or for a pointer to point to.
4701 After this sequence of ifs, TYPE is the type of the
4702 array or function or pointer, and DECLARATOR has had its
4703 outermost layer removed. */
4705 if (TREE_CODE (declarator) == ARRAY_REF)
4707 register tree itype = NULL_TREE;
4708 register tree size = TREE_OPERAND (declarator, 1);
4709 /* An uninitialized decl with `extern' is a reference. */
4710 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4711 /* The index is a signed object `sizetype' bits wide. */
4712 tree index_type = signed_type (sizetype);
4714 declarator = TREE_OPERAND (declarator, 0);
4716 /* Check for some types that there cannot be arrays of. */
4718 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4720 error ("declaration of `%s' as array of voids", name);
4721 type = error_mark_node;
4724 if (TREE_CODE (type) == FUNCTION_TYPE)
4726 error ("declaration of `%s' as array of functions", name);
4727 type = error_mark_node;
4730 if (size == error_mark_node)
4731 type = error_mark_node;
4733 if (type == error_mark_node)
4736 /* If this is a block level extern, it must live past the end
4737 of the function so that we can check it against other extern
4738 declarations (IDENTIFIER_LIMBO_VALUE). */
4739 if (extern_ref && allocation_temporary_p ())
4740 end_temporary_allocation ();
4742 /* If size was specified, set ITYPE to a range-type for that size.
4743 Otherwise, ITYPE remains null. finish_decl may figure it out
4744 from an initial value. */
4748 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4749 STRIP_TYPE_NOPS (size);
4751 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4752 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4754 error ("size of array `%s' has non-integer type", name);
4755 size = integer_one_node;
4758 if (pedantic && integer_zerop (size))
4759 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4761 if (TREE_CODE (size) == INTEGER_CST)
4763 constant_expression_warning (size);
4764 if (tree_int_cst_sgn (size) < 0)
4766 error ("size of array `%s' is negative", name);
4767 size = integer_one_node;
4772 /* Make sure the array size remains visibly nonconstant
4773 even if it is (eg) a const variable with known value. */
4778 if (TREE_CONSTANT (size))
4779 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4781 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4785 /* Convert size to index_type, so that if it is a variable
4786 the computations will be done in the proper mode. */
4787 itype = fold (build (MINUS_EXPR, index_type,
4788 convert (index_type, size),
4789 convert (index_type, size_one_node)));
4791 /* If that overflowed, the array is too big.
4792 ??? While a size of INT_MAX+1 technically shouldn't cause
4793 an overflow (because we subtract 1), the overflow is recorded
4794 during the conversion to index_type, before the subtraction.
4795 Handling this case seems like an unnecessary complication. */
4796 if (TREE_OVERFLOW (itype))
4798 error ("size of array `%s' is too large", name);
4799 type = error_mark_node;
4804 itype = variable_size (itype);
4805 itype = build_index_type (itype);
4808 #if 0 /* This had bad results for pointers to arrays, as in
4809 union incomplete (*foo)[4]; */
4810 /* Complain about arrays of incomplete types, except in typedefs. */
4812 if (TYPE_SIZE (type) == 0
4813 /* Avoid multiple warnings for nested array types. */
4814 && TREE_CODE (type) != ARRAY_TYPE
4815 && !(specbits & (1 << (int) RID_TYPEDEF))
4816 && !C_TYPE_BEING_DEFINED (type))
4817 warning ("array type has incomplete element type");
4820 #if 0 /* We shouldn't have a function type here at all!
4821 Functions aren't allowed as array elements. */
4822 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4823 && (constp || volatilep))
4824 pedwarn ("ANSI C forbids const or volatile function types");
4827 /* Build the array type itself, then merge any constancy or
4828 volatility into the target type. We must do it in this order
4829 to ensure that the TYPE_MAIN_VARIANT field of the array type
4830 is set correctly. */
4832 type = build_array_type (type, itype);
4833 if (constp || volatilep)
4834 type = c_build_type_variant (type, constp, volatilep);
4836 #if 0 /* don't clear these; leave them set so that the array type
4837 or the variable is itself const or volatile. */
4843 C_TYPE_VARIABLE_SIZE (type) = 1;
4845 else if (TREE_CODE (declarator) == CALL_EXPR)
4847 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4848 || current_binding_level == global_binding_level);
4851 /* Declaring a function type.
4852 Make sure we have a valid type for the function to return. */
4853 if (type == error_mark_node)
4858 /* Warn about some types functions can't return. */
4860 if (TREE_CODE (type) == FUNCTION_TYPE)
4862 error ("`%s' declared as function returning a function", name);
4863 type = integer_type_node;
4865 if (TREE_CODE (type) == ARRAY_TYPE)
4867 error ("`%s' declared as function returning an array", name);
4868 type = integer_type_node;
4871 #ifndef TRADITIONAL_RETURN_FLOAT
4872 /* Traditionally, declaring return type float means double. */
4874 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4875 type = double_type_node;
4876 #endif /* TRADITIONAL_RETURN_FLOAT */
4878 /* If this is a block level extern, it must live past the end
4879 of the function so that we can check it against other extern
4880 declarations (IDENTIFIER_LIMBO_VALUE). */
4881 if (extern_ref && allocation_temporary_p ())
4882 end_temporary_allocation ();
4884 /* Construct the function type and go to the next
4885 inner layer of declarator. */
4887 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4889 /* Say it's a definition
4890 only for the CALL_EXPR
4891 closest to the identifier. */
4892 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4893 #if 0 /* This seems to be false. We turn off temporary allocation
4894 above in this function if -traditional.
4895 And this code caused inconsistent results with prototypes:
4896 callers would ignore them, and pass arguments wrong. */
4898 /* Omit the arg types if -traditional, since the arg types
4899 and the list links might not be permanent. */
4900 type = build_function_type (type,
4902 ? NULL_TREE : arg_types);
4904 /* ANSI seems to say that `const int foo ();'
4905 does not make the function foo const. */
4906 if (constp || volatilep)
4907 type = c_build_type_variant (type, constp, volatilep);
4911 type = build_function_type (type, arg_types);
4912 declarator = TREE_OPERAND (declarator, 0);
4914 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4915 the formal parameter list of this FUNCTION_TYPE to point to
4916 the FUNCTION_TYPE node itself. */
4921 for (link = last_function_parm_tags;
4923 link = TREE_CHAIN (link))
4924 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4927 else if (TREE_CODE (declarator) == INDIRECT_REF)
4929 /* Merge any constancy or volatility into the target type
4932 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4933 && (constp || volatilep))
4934 pedwarn ("ANSI C forbids const or volatile function types");
4935 if (constp || volatilep)
4936 type = c_build_type_variant (type, constp, volatilep);
4941 type = build_pointer_type (type);
4943 /* Process a list of type modifier keywords
4944 (such as const or volatile) that were given inside the `*'. */
4946 if (TREE_TYPE (declarator))
4948 register tree typemodlist;
4950 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4951 typemodlist = TREE_CHAIN (typemodlist))
4953 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4955 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4960 error ("invalid type modifier within pointer declarator");
4964 pedwarn ("duplicate `const'");
4966 pedwarn ("duplicate `volatile'");
4969 declarator = TREE_OPERAND (declarator, 0);
4976 /* Now TYPE has the actual type. */
4978 /* Did array size calculations overflow? */
4980 if (TREE_CODE (type) == ARRAY_TYPE
4982 && TREE_OVERFLOW (TYPE_SIZE (type)))
4983 error ("size of array `%s' is too large", name);
4985 /* If this is declaring a typedef name, return a TYPE_DECL. */
4987 if (specbits & (1 << (int) RID_TYPEDEF))
4990 /* Note that the grammar rejects storage classes
4991 in typenames, fields or parameters */
4992 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4993 && (constp || volatilep))
4994 pedwarn ("ANSI C forbids const or volatile function types");
4995 if (constp || volatilep)
4996 type = c_build_type_variant (type, constp, volatilep);
4997 decl = build_decl (TYPE_DECL, declarator, type);
4998 if ((specbits & (1 << (int) RID_SIGNED))
4999 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5000 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5005 /* Detect the case of an array type of unspecified size
5006 which came, as such, direct from a typedef name.
5007 We must copy the type, so that each identifier gets
5008 a distinct type, so that each identifier's size can be
5009 controlled separately by its own initializer. */
5011 if (type != 0 && typedef_type != 0
5012 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5013 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5015 type = build_array_type (TREE_TYPE (type), 0);
5017 C_TYPE_VARIABLE_SIZE (type) = 1;
5020 /* If this is a type name (such as, in a cast or sizeof),
5021 compute the type and return it now. */
5023 if (decl_context == TYPENAME)
5025 /* Note that the grammar rejects storage classes
5026 in typenames, fields or parameters */
5027 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5028 && (constp || volatilep))
5029 pedwarn ("ANSI C forbids const or volatile function types");
5030 if (constp || volatilep)
5031 type = c_build_type_variant (type, constp, volatilep);
5036 /* Aside from typedefs and type names (handle above),
5037 `void' at top level (not within pointer)
5038 is allowed only in public variables.
5039 We don't complain about parms either, but that is because
5040 a better error message can be made later. */
5042 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5043 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5044 && ((specbits & (1 << (int) RID_EXTERN))
5045 || (current_binding_level == global_binding_level
5047 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5049 error ("variable or field `%s' declared void", name);
5050 type = integer_type_node;
5053 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5054 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5059 if (decl_context == PARM)
5061 tree type_as_written = type;
5064 /* A parameter declared as an array of T is really a pointer to T.
5065 One declared as a function is really a pointer to a function. */
5067 if (TREE_CODE (type) == ARRAY_TYPE)
5069 /* Transfer const-ness of array into that of type pointed to. */
5070 type = TREE_TYPE (type);
5071 if (constp || volatilep)
5072 type = c_build_type_variant (type, constp, volatilep);
5073 type = build_pointer_type (type);
5074 volatilep = constp = 0;
5077 else if (TREE_CODE (type) == FUNCTION_TYPE)
5079 if (pedantic && (constp || volatilep))
5080 pedwarn ("ANSI C forbids const or volatile function types");
5081 if (constp || volatilep)
5082 type = c_build_type_variant (type, constp, volatilep);
5083 type = build_pointer_type (type);
5084 volatilep = constp = 0;
5087 decl = build_decl (PARM_DECL, declarator, type);
5089 C_DECL_VARIABLE_SIZE (decl) = 1;
5091 /* Compute the type actually passed in the parmlist,
5092 for the case where there is no prototype.
5093 (For example, shorts and chars are passed as ints.)
5094 When there is a prototype, this is overridden later. */
5096 DECL_ARG_TYPE (decl) = type;
5097 main_type = (type == error_mark_node
5099 : TYPE_MAIN_VARIANT (type));
5100 if (main_type == float_type_node)
5101 DECL_ARG_TYPE (decl) = double_type_node;
5102 /* Don't use TYPE_PRECISION to decide whether to promote,
5103 because we should convert short if it's the same size as int,
5104 but we should not convert long if it's the same size as int. */
5105 else if (TREE_CODE (main_type) != ERROR_MARK
5106 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5108 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5109 && TREE_UNSIGNED (type))
5110 DECL_ARG_TYPE (decl) = unsigned_type_node;
5112 DECL_ARG_TYPE (decl) = integer_type_node;
5115 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5117 else if (decl_context == FIELD)
5119 /* Structure field. It may not be a function. */
5121 if (TREE_CODE (type) == FUNCTION_TYPE)
5123 error ("field `%s' declared as a function", name);
5124 type = build_pointer_type (type);
5126 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5128 error ("field `%s' has incomplete type", name);
5129 type = error_mark_node;
5131 /* Move type qualifiers down to element of an array. */
5132 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5134 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5136 TYPE_DOMAIN (type));
5137 #if 0 /* Leave the field const or volatile as well. */
5138 constp = volatilep = 0;
5141 decl = build_decl (FIELD_DECL, declarator, type);
5143 C_DECL_VARIABLE_SIZE (decl) = 1;
5145 else if (TREE_CODE (type) == FUNCTION_TYPE)
5147 /* Every function declaration is "external"
5148 except for those which are inside a function body
5149 in which `auto' is used.
5150 That is a case not specified by ANSI C,
5151 and we use it for forward declarations for nested functions. */
5152 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5153 || current_binding_level == global_binding_level);
5155 if (specbits & (1 << (int) RID_AUTO)
5156 && (pedantic || current_binding_level == global_binding_level))
5157 pedwarn ("invalid storage class for function `%s'", name);
5158 if (specbits & (1 << (int) RID_REGISTER))
5159 error ("invalid storage class for function `%s'", name);
5160 /* Function declaration not at top level.
5161 Storage classes other than `extern' are not allowed
5162 and `extern' makes no difference. */
5163 if (current_binding_level != global_binding_level
5164 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5166 pedwarn ("invalid storage class for function `%s'", name);
5168 /* If this is a block level extern, it must live past the end
5169 of the function so that we can check it against other
5170 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5171 if (extern_ref && allocation_temporary_p ())
5172 end_temporary_allocation ();
5174 decl = build_decl (FUNCTION_DECL, declarator, type);
5175 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5177 if (pedantic && (constp || volatilep)
5178 && ! DECL_IN_SYSTEM_HEADER (decl))
5179 pedwarn ("ANSI C forbids const or volatile functions");
5182 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5183 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5184 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5185 && ! DECL_IN_SYSTEM_HEADER (decl))
5186 pedwarn ("ANSI C forbids const or volatile void function return type");
5189 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5190 warning ("`noreturn' function returns non-void value");
5193 DECL_EXTERNAL (decl) = 1;
5194 /* Record absence of global scope for `static' or `auto'. */
5196 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5198 /* Record presence of `inline', if it is reasonable. */
5201 tree last = tree_last (TYPE_ARG_TYPES (type));
5203 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5204 warning ("cannot inline function `main'");
5206 /* Assume that otherwise the function can be inlined. */
5207 DECL_INLINE (decl) = 1;
5209 if (specbits & (1 << (int) RID_EXTERN))
5210 current_extern_inline = 1;
5215 /* It's a variable. */
5216 /* An uninitialized decl with `extern' is a reference. */
5217 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5219 /* Move type qualifiers down to element of an array. */
5220 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5222 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5224 TYPE_DOMAIN (type));
5225 #if 0 /* Leave the variable const or volatile as well. */
5226 constp = volatilep = 0;
5230 /* If this is a block level extern, it must live past the end
5231 of the function so that we can check it against other
5232 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5233 if (extern_ref && allocation_temporary_p ())
5234 end_temporary_allocation ();
5236 decl = build_decl (VAR_DECL, declarator, type);
5238 C_DECL_VARIABLE_SIZE (decl) = 1;
5241 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5243 DECL_EXTERNAL (decl) = extern_ref;
5244 /* At top level, the presence of a `static' or `register' storage
5245 class specifier, or the absence of all storage class specifiers
5246 makes this declaration a definition (perhaps tentative). Also,
5247 the absence of both `static' and `register' makes it public. */
5248 if (current_binding_level == global_binding_level)
5252 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5253 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5255 /* Not at top level, only `static' makes a static definition. */
5258 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5259 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5262 if (specbits & 1 << (int) RID_ITERATOR)
5263 ITERATOR_P (decl) = 1;
5266 /* Record `register' declaration for warnings on &
5267 and in case doing stupid register allocation. */
5269 if (specbits & (1 << (int) RID_REGISTER))
5270 DECL_REGISTER (decl) = 1;
5272 /* Record constancy and volatility. */
5275 TREE_READONLY (decl) = 1;
5278 TREE_SIDE_EFFECTS (decl) = 1;
5279 TREE_THIS_VOLATILE (decl) = 1;
5281 /* If a type has volatile components, it should be stored in memory.
5282 Otherwise, the fact that those components are volatile
5283 will be ignored, and would even crash the compiler. */
5284 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5285 mark_addressable (decl);
5293 /* Decode the parameter-list info for a function type or function definition.
5294 The argument is the value returned by `get_parm_info' (or made in parse.y
5295 if there is an identifier list instead of a parameter decl list).
5296 These two functions are separate because when a function returns
5297 or receives functions then each is called multiple times but the order
5298 of calls is different. The last call to `grokparms' is always the one
5299 that contains the formal parameter names of a function definition.
5301 Store in `last_function_parms' a chain of the decls of parms.
5302 Also store in `last_function_parm_tags' a chain of the struct, union,
5303 and enum tags declared among the parms.
5305 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5307 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5308 a mere declaration. A nonempty identifier-list gets an error message
5309 when FUNCDEF_FLAG is zero. */
5312 grokparms (parms_info, funcdef_flag)
5316 tree first_parm = TREE_CHAIN (parms_info);
5318 last_function_parms = TREE_PURPOSE (parms_info);
5319 last_function_parm_tags = TREE_VALUE (parms_info);
5321 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5322 && !in_system_header)
5323 warning ("function declaration isn't a prototype");
5326 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5329 pedwarn ("parameter names (without types) in function declaration");
5331 last_function_parms = first_parm;
5338 /* We no longer test FUNCDEF_FLAG.
5339 If the arg types are incomplete in a declaration,
5340 they must include undefined tags.
5341 These tags can never be defined in the scope of the declaration,
5342 so the types can never be completed,
5343 and no call can be compiled successfully. */
5345 /* In a fcn definition, arg types must be complete. */
5348 for (parm = last_function_parms, typelt = first_parm;
5350 parm = TREE_CHAIN (parm))
5351 /* Skip over any enumeration constants declared here. */
5352 if (TREE_CODE (parm) == PARM_DECL)
5354 /* Barf if the parameter itself has an incomplete type. */
5355 tree type = TREE_VALUE (typelt);
5356 if (TYPE_SIZE (type) == 0)
5358 if (funcdef_flag && DECL_NAME (parm) != 0)
5359 error ("parameter `%s' has incomplete type",
5360 IDENTIFIER_POINTER (DECL_NAME (parm)));
5362 warning ("parameter has incomplete type");
5365 TREE_VALUE (typelt) = error_mark_node;
5366 TREE_TYPE (parm) = error_mark_node;
5369 #if 0 /* This has been replaced by parm_tags_warning
5370 which uses a more accurate criterion for what to warn about. */
5373 /* Now warn if is a pointer to an incomplete type. */
5374 while (TREE_CODE (type) == POINTER_TYPE
5375 || TREE_CODE (type) == REFERENCE_TYPE)
5376 type = TREE_TYPE (type);
5377 type = TYPE_MAIN_VARIANT (type);
5378 if (TYPE_SIZE (type) == 0)
5380 if (DECL_NAME (parm) != 0)
5381 warning ("parameter `%s' points to incomplete type",
5382 IDENTIFIER_POINTER (DECL_NAME (parm)));
5384 warning ("parameter points to incomplete type");
5388 typelt = TREE_CHAIN (typelt);
5391 /* Allocate the list of types the way we allocate a type. */
5392 if (first_parm && ! TREE_PERMANENT (first_parm))
5394 /* Construct a copy of the list of types
5395 on the saveable obstack. */
5397 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5398 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5400 return nreverse (result);
5403 /* The list we have is permanent already. */
5409 /* Return a tree_list node with info on a parameter list just parsed.
5410 The TREE_PURPOSE is a chain of decls of those parms.
5411 The TREE_VALUE is a list of structure, union and enum tags defined.
5412 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5413 This tree_list node is later fed to `grokparms'.
5415 VOID_AT_END nonzero means append `void' to the end of the type-list.
5416 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5419 get_parm_info (void_at_end)
5422 register tree decl, t;
5423 register tree types = 0;
5425 tree tags = gettags ();
5426 tree parms = getdecls ();
5428 tree order = current_binding_level->parm_order;
5430 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5431 if (void_at_end && parms != 0
5432 && TREE_CHAIN (parms) == 0
5433 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5434 && DECL_NAME (parms) == 0)
5437 storedecls (NULL_TREE);
5438 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5439 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5442 /* Extract enumerator values and other non-parms declared with the parms.
5443 Likewise any forward parm decls that didn't have real parm decls. */
5444 for (decl = parms; decl; )
5446 tree next = TREE_CHAIN (decl);
5448 if (TREE_CODE (decl) != PARM_DECL)
5450 TREE_CHAIN (decl) = new_parms;
5453 else if (TREE_ASM_WRITTEN (decl))
5455 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5456 TREE_CHAIN (decl) = new_parms;
5462 /* Put the parm decls back in the order they were in in the parm list. */
5463 for (t = order; t; t = TREE_CHAIN (t))
5466 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5468 TREE_CHAIN (TREE_VALUE (t)) = 0;
5471 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5474 /* Store the parmlist in the binding level since the old one
5475 is no longer a valid list. (We have changed the chain pointers.) */
5476 storedecls (new_parms);
5478 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5479 /* There may also be declarations for enumerators if an enumeration
5480 type is declared among the parms. Ignore them here. */
5481 if (TREE_CODE (decl) == PARM_DECL)
5483 /* Since there is a prototype,
5484 args are passed in their declared types. */
5485 tree type = TREE_TYPE (decl);
5486 DECL_ARG_TYPE (decl) = type;
5487 #ifdef PROMOTE_PROTOTYPES
5488 if ((TREE_CODE (type) == INTEGER_TYPE
5489 || TREE_CODE (type) == ENUMERAL_TYPE)
5490 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5491 DECL_ARG_TYPE (decl) = integer_type_node;
5494 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5495 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5496 && DECL_NAME (decl) == 0)
5498 error ("`void' in parameter list must be the entire list");
5504 return saveable_tree_cons (new_parms, tags,
5505 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5507 return saveable_tree_cons (new_parms, tags, nreverse (types));
5510 /* At end of parameter list, warn about any struct, union or enum tags
5511 defined within. Do so because these types cannot ever become complete. */
5514 parmlist_tags_warning ()
5519 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5521 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5522 /* An anonymous union parm type is meaningful as a GNU extension.
5523 So don't warn for that. */
5524 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5526 if (TREE_PURPOSE (elt) != 0)
5527 warning ("`%s %s' declared inside parameter list",
5528 (code == RECORD_TYPE ? "struct"
5529 : code == UNION_TYPE ? "union"
5531 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5533 warning ("anonymous %s declared inside parameter list",
5534 (code == RECORD_TYPE ? "struct"
5535 : code == UNION_TYPE ? "union"
5540 warning ("its scope is only this definition or declaration,");
5541 warning ("which is probably not what you want.");
5547 /* Get the struct, enum or union (CODE says which) with tag NAME.
5548 Define the tag as a forward-reference if it is not defined. */
5551 xref_tag (code, name)
5552 enum tree_code code;
5555 int temporary = allocation_temporary_p ();
5557 /* If a cross reference is requested, look up the type
5558 already defined for this tag and return it. */
5560 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5561 /* Even if this is the wrong type of tag, return what we found.
5562 There will be an error message anyway, from pending_xref_error.
5563 If we create an empty xref just for an invalid use of the type,
5564 the main result is to create lots of superfluous error messages. */
5568 push_obstacks_nochange ();
5570 if (current_binding_level == global_binding_level && temporary)
5571 end_temporary_allocation ();
5573 /* If no such tag is yet defined, create a forward-reference node
5574 and record it as the "definition".
5575 When a real declaration of this type is found,
5576 the forward-reference will be altered into a real type. */
5578 ref = make_node (code);
5579 if (code == ENUMERAL_TYPE)
5581 /* (In ANSI, Enums can be referred to only if already defined.) */
5583 pedwarn ("ANSI C forbids forward references to `enum' types");
5584 /* Give the type a default layout like unsigned int
5585 to avoid crashing if it does not get defined. */
5586 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5587 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5588 TREE_UNSIGNED (ref) = 1;
5589 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5590 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5591 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5594 pushtag (name, ref);
5601 /* Make sure that the tag NAME is defined *in the current binding level*
5602 at least as a forward reference.
5603 CODE says which kind of tag NAME ought to be.
5605 We also do a push_obstacks_nochange
5606 whose matching pop is in finish_struct. */
5609 start_struct (code, name)
5610 enum tree_code code;
5613 /* If there is already a tag defined at this binding level
5614 (as a forward reference), just return it. */
5616 register tree ref = 0;
5618 push_obstacks_nochange ();
5619 if (current_binding_level == global_binding_level)
5620 end_temporary_allocation ();
5623 ref = lookup_tag (code, name, current_binding_level, 1);
5624 if (ref && TREE_CODE (ref) == code)
5626 C_TYPE_BEING_DEFINED (ref) = 1;
5627 TYPE_PACKED (ref) = flag_pack_struct;
5628 if (TYPE_FIELDS (ref))
5629 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5630 : "redefinition of `struct %s'"),
5631 IDENTIFIER_POINTER (name));
5636 /* Otherwise create a forward-reference just so the tag is in scope. */
5638 ref = make_node (code);
5639 pushtag (name, ref);
5640 C_TYPE_BEING_DEFINED (ref) = 1;
5641 TYPE_PACKED (ref) = flag_pack_struct;
5645 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5646 of a structure component, returning a FIELD_DECL node.
5647 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5649 This is done during the parsing of the struct declaration.
5650 The FIELD_DECL nodes are chained together and the lot of them
5651 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5654 grokfield (filename, line, declarator, declspecs, width)
5657 tree declarator, declspecs, width;
5661 /* The corresponding pop_obstacks is in finish_decl. */
5662 push_obstacks_nochange ();
5664 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5666 finish_decl (value, NULL_TREE, NULL_TREE);
5667 DECL_INITIAL (value) = width;
5669 maybe_objc_check_decl (value);
5673 /* Function to help qsort sort FIELD_DECLs by name order. */
5676 field_decl_cmp (xp, yp)
5677 const GENERIC_PTR xp;
5678 const GENERIC_PTR yp;
5680 tree *x = (tree *)xp, *y = (tree *)yp;
5682 if (DECL_NAME (*x) == DECL_NAME (*y))
5684 if (DECL_NAME (*x) == NULL)
5686 if (DECL_NAME (*y) == NULL)
5688 if (DECL_NAME (*x) < DECL_NAME (*y))
5693 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5694 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5695 ATTRIBUTES are attributes to be applied to the structure.
5697 We also do a pop_obstacks to match the push in start_struct. */
5700 finish_struct (t, fieldlist, attributes)
5707 int toplevel = global_binding_level == current_binding_level;
5709 /* If this type was previously laid out as a forward reference,
5710 make sure we lay it out again. */
5714 decl_attributes (t, attributes, NULL_TREE);
5716 /* Nameless union parm types are useful as GCC extension. */
5717 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5718 /* Otherwise, warn about any struct or union def. in parmlist. */
5719 if (in_parm_level_p ())
5722 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5723 : "structure defined inside parms"));
5724 else if (! flag_traditional)
5725 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5726 : "structure defined inside parms"));
5729 old_momentary = suspend_momentary ();
5733 for (x = fieldlist; x; x = TREE_CHAIN (x))
5734 if (DECL_NAME (x) != 0)
5738 pedwarn ("%s has no %smembers",
5739 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5740 (fieldlist ? "named " : ""));
5743 /* Install struct as DECL_CONTEXT of each field decl.
5744 Also process specified field sizes.
5745 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5746 The specified size is found in the DECL_INITIAL.
5747 Store 0 there, except for ": 0" fields (so we can find them
5748 and delete them, below). */
5750 for (x = fieldlist; x; x = TREE_CHAIN (x))
5752 DECL_CONTEXT (x) = t;
5753 DECL_PACKED (x) |= TYPE_PACKED (t);
5754 DECL_FIELD_SIZE (x) = 0;
5756 /* If any field is const, the structure type is pseudo-const. */
5757 if (TREE_READONLY (x))
5758 C_TYPE_FIELDS_READONLY (t) = 1;
5761 /* A field that is pseudo-const makes the structure likewise. */
5762 tree t1 = TREE_TYPE (x);
5763 while (TREE_CODE (t1) == ARRAY_TYPE)
5764 t1 = TREE_TYPE (t1);
5765 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5766 && C_TYPE_FIELDS_READONLY (t1))
5767 C_TYPE_FIELDS_READONLY (t) = 1;
5770 /* Any field that is volatile means variables of this type must be
5771 treated in some ways as volatile. */
5772 if (TREE_THIS_VOLATILE (x))
5773 C_TYPE_FIELDS_VOLATILE (t) = 1;
5775 /* Any field of nominal variable size implies structure is too. */
5776 if (C_DECL_VARIABLE_SIZE (x))
5777 C_TYPE_VARIABLE_SIZE (t) = 1;
5779 /* Detect invalid nested redefinition. */
5780 if (TREE_TYPE (x) == t)
5781 error ("nested redefinition of `%s'",
5782 IDENTIFIER_POINTER (TYPE_NAME (t)));
5784 /* Detect invalid bit-field size. */
5785 if (DECL_INITIAL (x))
5786 STRIP_NOPS (DECL_INITIAL (x));
5787 if (DECL_INITIAL (x))
5789 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5790 constant_expression_warning (DECL_INITIAL (x));
5793 error_with_decl (x, "bit-field `%s' width not an integer constant");
5794 DECL_INITIAL (x) = NULL;
5798 /* Detect invalid bit-field type. */
5799 if (DECL_INITIAL (x)
5800 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5801 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5803 error_with_decl (x, "bit-field `%s' has invalid type");
5804 DECL_INITIAL (x) = NULL;
5806 if (DECL_INITIAL (x) && pedantic
5807 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5808 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5809 /* Accept an enum that's equivalent to int or unsigned int. */
5810 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5811 && (TYPE_PRECISION (TREE_TYPE (x))
5812 == TYPE_PRECISION (integer_type_node))))
5813 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5815 /* Detect and ignore out of range field width. */
5816 if (DECL_INITIAL (x))
5818 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5820 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5822 DECL_INITIAL (x) = NULL;
5823 error_with_decl (x, "negative width in bit-field `%s'");
5825 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5826 || width > TYPE_PRECISION (TREE_TYPE (x)))
5828 DECL_INITIAL (x) = NULL;
5829 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5831 else if (width == 0 && DECL_NAME (x) != 0)
5833 error_with_decl (x, "zero width for bit-field `%s'");
5834 DECL_INITIAL (x) = NULL;
5838 /* Process valid field width. */
5839 if (DECL_INITIAL (x))
5841 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5843 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5844 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5845 TREE_UNSIGNED (TREE_TYPE (x)))
5846 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5847 TREE_UNSIGNED (TREE_TYPE (x)))))
5848 warning_with_decl (x, "`%s' is narrower than values of its type");
5850 DECL_FIELD_SIZE (x) = width;
5851 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5852 DECL_INITIAL (x) = NULL;
5856 /* field size 0 => force desired amount of alignment. */
5857 #ifdef EMPTY_FIELD_BOUNDARY
5858 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5860 #ifdef PCC_BITFIELD_TYPE_MATTERS
5861 if (PCC_BITFIELD_TYPE_MATTERS)
5862 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5863 TYPE_ALIGN (TREE_TYPE (x)));
5867 else if (TREE_TYPE (x) != error_mark_node)
5869 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5870 : TYPE_ALIGN (TREE_TYPE (x)));
5871 /* Non-bit-fields are aligned for their type, except packed
5872 fields which require only BITS_PER_UNIT alignment. */
5873 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5877 /* Now DECL_INITIAL is null on all members. */
5879 /* Delete all duplicate fields from the fieldlist */
5880 for (x = fieldlist; x && TREE_CHAIN (x);)
5881 /* Anonymous fields aren't duplicates. */
5882 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5886 register tree y = fieldlist;
5890 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5896 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5898 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5899 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5901 else x = TREE_CHAIN (x);
5904 /* Now we have the nearly final fieldlist. Record it,
5905 then lay out the structure or union (including the fields). */
5907 TYPE_FIELDS (t) = fieldlist;
5911 /* Delete all zero-width bit-fields from the front of the fieldlist */
5913 && DECL_INITIAL (fieldlist))
5914 fieldlist = TREE_CHAIN (fieldlist);
5915 /* Delete all such members from the rest of the fieldlist */
5916 for (x = fieldlist; x;)
5918 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5919 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5920 else x = TREE_CHAIN (x);
5923 /* Now we have the truly final field list.
5924 Store it in this type and in the variants. */
5926 TYPE_FIELDS (t) = fieldlist;
5928 /* If there are lots of fields, sort so we can look through them fast.
5929 We arbitrarily consider 16 or more elts to be "a lot". */
5933 for (x = fieldlist; x; x = TREE_CHAIN (x))
5944 len += list_length (x);
5945 /* Use the same allocation policy here that make_node uses, to
5946 ensure that this lives as long as the rest of the struct decl.
5947 All decls in an inline function need to be saved. */
5948 if (allocation_temporary_p ())
5949 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5951 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5953 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5954 TYPE_LANG_SPECIFIC (t)->len = len;
5956 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5958 for (x = fieldlist; x; x = TREE_CHAIN (x))
5959 field_array[len++] = x;
5961 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5965 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5967 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5968 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5969 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5972 /* If this was supposed to be a transparent union, but we can't
5973 make it one, warn and turn off the flag. */
5974 if (TREE_CODE (t) == UNION_TYPE
5975 && TYPE_TRANSPARENT_UNION (t)
5976 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5978 TYPE_TRANSPARENT_UNION (t) = 0;
5979 warning ("union cannot be made transparent");
5982 /* If this structure or union completes the type of any previous
5983 variable declaration, lay it out and output its rtl. */
5985 if (current_binding_level->n_incomplete != 0)
5988 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5990 if (TREE_TYPE (decl) == t
5991 && TREE_CODE (decl) != TYPE_DECL)
5993 layout_decl (decl, 0);
5994 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5995 maybe_objc_check_decl (decl);
5996 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5999 --current_binding_level->n_incomplete;
6001 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6002 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6004 tree element = TREE_TYPE (decl);
6005 while (TREE_CODE (element) == ARRAY_TYPE)
6006 element = TREE_TYPE (element);
6008 layout_array_type (TREE_TYPE (decl));
6013 resume_momentary (old_momentary);
6015 /* Finish debugging output for this type. */
6016 rest_of_type_compilation (t, toplevel);
6018 /* The matching push is in start_struct. */
6024 /* Lay out the type T, and its element type, and so on. */
6027 layout_array_type (t)
6030 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6031 layout_array_type (TREE_TYPE (t));
6035 /* Begin compiling the definition of an enumeration type.
6036 NAME is its name (or null if anonymous).
6037 Returns the type object, as yet incomplete.
6038 Also records info about it so that build_enumerator
6039 may be used to declare the individual values as they are read. */
6045 register tree enumtype = 0;
6047 /* If this is the real definition for a previous forward reference,
6048 fill in the contents in the same object that used to be the
6049 forward reference. */
6052 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6054 /* The corresponding pop_obstacks is in finish_enum. */
6055 push_obstacks_nochange ();
6056 /* If these symbols and types are global, make them permanent. */
6057 if (current_binding_level == global_binding_level)
6058 end_temporary_allocation ();
6060 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6062 enumtype = make_node (ENUMERAL_TYPE);
6063 pushtag (name, enumtype);
6066 C_TYPE_BEING_DEFINED (enumtype) = 1;
6068 if (TYPE_VALUES (enumtype) != 0)
6070 /* This enum is a named one that has been declared already. */
6071 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6073 /* Completely replace its old definition.
6074 The old enumerators remain defined, however. */
6075 TYPE_VALUES (enumtype) = 0;
6078 enum_next_value = integer_zero_node;
6081 if (flag_short_enums)
6082 TYPE_PACKED (enumtype) = 1;
6087 /* After processing and defining all the values of an enumeration type,
6088 install their decls in the enumeration type and finish it off.
6089 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6090 and ATTRIBUTES are the specified attributes.
6091 Returns ENUMTYPE. */
6094 finish_enum (enumtype, values, attributes)
6099 register tree pair, tem;
6100 tree minnode = 0, maxnode = 0;
6101 int lowprec, highprec, precision;
6102 int toplevel = global_binding_level == current_binding_level;
6104 if (in_parm_level_p ())
6105 warning ("enum defined inside parms");
6107 decl_attributes (enumtype, attributes, NULL_TREE);
6109 /* Calculate the maximum value of any enumerator in this type. */
6111 if (values == error_mark_node)
6112 minnode = maxnode = integer_zero_node;
6114 for (pair = values; pair; pair = TREE_CHAIN (pair))
6116 tree value = TREE_VALUE (pair);
6118 minnode = maxnode = TREE_VALUE (pair);
6121 if (tree_int_cst_lt (maxnode, value))
6123 if (tree_int_cst_lt (value, minnode))
6128 TYPE_MIN_VALUE (enumtype) = minnode;
6129 TYPE_MAX_VALUE (enumtype) = maxnode;
6131 /* An enum can have some negative values; then it is signed. */
6132 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6134 /* Determine the precision this type needs. */
6136 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6137 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6138 precision = MAX (lowprec, highprec);
6140 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6142 tree narrowest = type_for_size (precision, 1);
6145 warning ("enumeration values exceed range of largest integer");
6146 narrowest = long_long_integer_type_node;
6149 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6152 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6154 TYPE_SIZE (enumtype) = 0;
6155 layout_type (enumtype);
6157 if (values != error_mark_node)
6159 /* Change the type of the enumerators to be the enum type.
6160 Formerly this was done only for enums that fit in an int,
6161 but the comment said it was done only for enums wider than int.
6162 It seems necessary to do this for wide enums,
6163 and best not to change what's done for ordinary narrower ones. */
6164 for (pair = values; pair; pair = TREE_CHAIN (pair))
6166 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6167 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6168 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6169 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6172 /* Replace the decl nodes in VALUES with their names. */
6173 for (pair = values; pair; pair = TREE_CHAIN (pair))
6174 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6176 TYPE_VALUES (enumtype) = values;
6179 /* Fix up all variant types of this enum type. */
6180 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6182 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6183 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6184 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6185 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6186 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6187 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6188 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6189 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6192 /* Finish debugging output for this type. */
6193 rest_of_type_compilation (enumtype, toplevel);
6195 /* This matches a push in start_enum. */
6201 /* Build and install a CONST_DECL for one value of the
6202 current enumeration type (one that was begun with start_enum).
6203 Return a tree-list containing the CONST_DECL and its value.
6204 Assignment of sequential values by default is handled here. */
6207 build_enumerator (name, value)
6210 register tree decl, type;
6212 /* Validate and default VALUE. */
6214 /* Remove no-op casts from the value. */
6216 STRIP_TYPE_NOPS (value);
6220 if (TREE_CODE (value) == INTEGER_CST)
6222 value = default_conversion (value);
6223 constant_expression_warning (value);
6227 error ("enumerator value for `%s' not integer constant",
6228 IDENTIFIER_POINTER (name));
6233 /* Default based on previous value. */
6234 /* It should no longer be possible to have NON_LVALUE_EXPR
6238 value = enum_next_value;
6240 error ("overflow in enumeration values");
6243 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6245 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6246 value = integer_zero_node;
6249 /* Set basis for default for next value. */
6250 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6251 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6253 /* Now create a declaration for the enum value name. */
6255 type = TREE_TYPE (value);
6256 type = type_for_size (MAX (TYPE_PRECISION (type),
6257 TYPE_PRECISION (integer_type_node)),
6259 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6260 && TREE_UNSIGNED (type)));
6262 decl = build_decl (CONST_DECL, name, type);
6263 DECL_INITIAL (decl) = value;
6264 TREE_TYPE (value) = type;
6267 return saveable_tree_cons (decl, value, NULL_TREE);
6270 /* Create the FUNCTION_DECL for a function definition.
6271 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6272 the declaration; they describe the function's name and the type it returns,
6273 but twisted together in a fashion that parallels the syntax of C.
6275 This function creates a binding context for the function body
6276 as well as setting up the FUNCTION_DECL in current_function_decl.
6278 Returns 1 on success. If the DECLARATOR is not suitable for a function
6279 (it defines a datum instead), we return 0, which tells
6280 yyparse to report a parse error.
6282 NESTED is nonzero for a function nested within another function. */
6285 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6286 tree declarator, declspecs, prefix_attributes, attributes;
6289 tree decl1, old_decl;
6291 int old_immediate_size_expand = immediate_size_expand;
6293 current_function_returns_value = 0; /* Assume, until we see it does. */
6294 current_function_returns_null = 0;
6295 warn_about_return_type = 0;
6296 current_extern_inline = 0;
6297 c_function_varargs = 0;
6299 shadowed_labels = 0;
6301 /* Don't expand any sizes in the return type of the function. */
6302 immediate_size_expand = 0;
6304 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6306 /* If the declarator is not suitable for a function definition,
6307 cause a syntax error. */
6310 immediate_size_expand = old_immediate_size_expand;
6314 decl_attributes (decl1, prefix_attributes, attributes);
6316 announce_function (decl1);
6318 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6320 error ("return-type is an incomplete type");
6321 /* Make it return void instead. */
6323 = build_function_type (void_type_node,
6324 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6327 if (warn_about_return_type)
6328 warning ("return-type defaults to `int'");
6330 /* Save the parm names or decls from this function's declarator
6331 where store_parm_decls will find them. */
6332 current_function_parms = last_function_parms;
6333 current_function_parm_tags = last_function_parm_tags;
6335 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6336 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6337 DECL_INITIAL (decl1) = error_mark_node;
6339 /* If this definition isn't a prototype and we had a prototype declaration
6340 before, copy the arg type info from that prototype.
6341 But not if what we had before was a builtin function. */
6342 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6343 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6344 && !DECL_BUILT_IN (old_decl)
6345 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6346 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6347 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6349 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6350 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6351 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6354 /* If there is no explicit declaration, look for any out-of-scope implicit
6357 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6359 /* Optionally warn of old-fashioned def with no previous prototype. */
6360 if (warn_strict_prototypes
6361 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6362 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6363 warning ("function declaration isn't a prototype");
6364 /* Optionally warn of any global def with no previous prototype. */
6365 else if (warn_missing_prototypes
6366 && TREE_PUBLIC (decl1)
6367 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6368 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6369 warning_with_decl (decl1, "no previous prototype for `%s'");
6370 /* Optionally warn of any def with no previous prototype
6371 if the function has already been used. */
6372 else if (warn_missing_prototypes
6373 && old_decl != 0 && TREE_USED (old_decl)
6374 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6375 warning_with_decl (decl1,
6376 "`%s' was used with no prototype before its definition");
6377 /* Optionally warn of any global def with no previous declaration. */
6378 else if (warn_missing_declarations
6379 && TREE_PUBLIC (decl1)
6381 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6382 warning_with_decl (decl1, "no previous declaration for `%s'");
6383 /* Optionally warn of any def with no previous declaration
6384 if the function has already been used. */
6385 else if (warn_missing_declarations
6386 && old_decl != 0 && TREE_USED (old_decl)
6387 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6388 warning_with_decl (decl1,
6389 "`%s' was used with no declaration before its definition");
6391 /* This is a definition, not a reference.
6392 So normally clear DECL_EXTERNAL.
6393 However, `extern inline' acts like a declaration
6394 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6395 DECL_EXTERNAL (decl1) = current_extern_inline;
6397 /* This function exists in static storage.
6398 (This does not mean `static' in the C sense!) */
6399 TREE_STATIC (decl1) = 1;
6401 /* A nested function is not global. */
6402 if (current_function_decl != 0)
6403 TREE_PUBLIC (decl1) = 0;
6405 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6407 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6412 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6413 != integer_type_node)
6414 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6416 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6417 args = TREE_CHAIN (args))
6419 tree type = args ? TREE_VALUE (args) : 0;
6421 if (type == void_type_node)
6428 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6429 pedwarn_with_decl (decl1,
6430 "first argument of `%s' should be `int'");
6434 if (TREE_CODE (type) != POINTER_TYPE
6435 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6436 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6438 pedwarn_with_decl (decl1,
6439 "second argument of `%s' should be `char **'");
6443 if (TREE_CODE (type) != POINTER_TYPE
6444 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6445 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6447 pedwarn_with_decl (decl1,
6448 "third argument of `%s' should probably be `char **'");
6453 /* It is intentional that this message does not mention the third
6454 argument, which is warned for only pedantically, because it's
6455 blessed by mention in an appendix of the standard. */
6456 if (argct > 0 && (argct < 2 || argct > 3))
6457 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6459 if (argct == 3 && pedantic)
6460 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6462 if (! TREE_PUBLIC (decl1))
6463 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6466 /* Record the decl so that the function name is defined.
6467 If we already have a decl for this name, and it is a FUNCTION_DECL,
6468 use the old decl. */
6470 current_function_decl = pushdecl (decl1);
6473 declare_parm_level (1);
6474 current_binding_level->subblocks_tag_transparent = 1;
6476 make_function_rtl (current_function_decl);
6478 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6479 /* Promote the value to int before returning it. */
6480 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6482 /* It retains unsignedness if traditional
6483 or if not really getting wider. */
6484 if (TREE_UNSIGNED (restype)
6485 && (flag_traditional
6486 || (TYPE_PRECISION (restype)
6487 == TYPE_PRECISION (integer_type_node))))
6488 restype = unsigned_type_node;
6490 restype = integer_type_node;
6492 DECL_RESULT (current_function_decl)
6493 = build_decl (RESULT_DECL, NULL_TREE, restype);
6496 /* Allocate further tree nodes temporarily during compilation
6497 of this function only. */
6498 temporary_allocation ();
6500 /* If this fcn was already referenced via a block-scope `extern' decl
6501 (or an implicit decl), propagate certain information about the usage. */
6502 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6503 TREE_ADDRESSABLE (current_function_decl) = 1;
6505 immediate_size_expand = old_immediate_size_expand;
6510 /* Record that this function is going to be a varargs function.
6511 This is called before store_parm_decls, which is too early
6512 to call mark_varargs directly. */
6517 c_function_varargs = 1;
6520 /* Store the parameter declarations into the current function declaration.
6521 This is called after parsing the parameter declarations, before
6522 digesting the body of the function.
6524 For an old-style definition, modify the function's type
6525 to specify at least the number of arguments. */
6530 register tree fndecl = current_function_decl;
6533 /* This is either a chain of PARM_DECLs (if a prototype was used)
6534 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6535 tree specparms = current_function_parms;
6537 /* This is a list of types declared among parms in a prototype. */
6538 tree parmtags = current_function_parm_tags;
6540 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6541 register tree parmdecls = getdecls ();
6543 /* This is a chain of any other decls that came in among the parm
6544 declarations. If a parm is declared with enum {foo, bar} x;
6545 then CONST_DECLs for foo and bar are put here. */
6548 /* Nonzero if this definition is written with a prototype. */
6551 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6553 /* This case is when the function was defined with an ANSI prototype.
6554 The parms already have decls, so we need not do anything here
6555 except record them as in effect
6556 and complain if any redundant old-style parm decls were written. */
6567 error_with_decl (fndecl,
6568 "parm types given both in parmlist and separately");
6569 /* Get rid of the erroneous decls; don't keep them on
6570 the list of parms, since they might not be PARM_DECLs. */
6571 for (decl = current_binding_level->names;
6572 decl; decl = TREE_CHAIN (decl))
6573 if (DECL_NAME (decl))
6574 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6575 for (link = current_binding_level->shadowed;
6576 link; link = TREE_CHAIN (link))
6577 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6578 current_binding_level->names = 0;
6579 current_binding_level->shadowed = 0;
6582 specparms = nreverse (specparms);
6583 for (parm = specparms; parm; parm = next)
6585 next = TREE_CHAIN (parm);
6586 if (TREE_CODE (parm) == PARM_DECL)
6588 if (DECL_NAME (parm) == 0)
6589 error_with_decl (parm, "parameter name omitted");
6590 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6592 error_with_decl (parm, "parameter `%s' declared void");
6593 /* Change the type to error_mark_node so this parameter
6594 will be ignored by assign_parms. */
6595 TREE_TYPE (parm) = error_mark_node;
6601 /* If we find an enum constant or a type tag,
6602 put it aside for the moment. */
6603 TREE_CHAIN (parm) = 0;
6604 others = chainon (others, parm);
6608 /* Get the decls in their original chain order
6609 and record in the function. */
6610 DECL_ARGUMENTS (fndecl) = getdecls ();
6613 /* If this function takes a variable number of arguments,
6614 add a phony parameter to the end of the parm list,
6615 to represent the position of the first unnamed argument. */
6616 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6619 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6620 /* Let's hope the address of the unnamed parm
6621 won't depend on its type. */
6622 TREE_TYPE (dummy) = integer_type_node;
6623 DECL_ARG_TYPE (dummy) = integer_type_node;
6624 DECL_ARGUMENTS (fndecl)
6625 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6629 /* Now pushdecl the enum constants. */
6630 for (parm = others; parm; parm = next)
6632 next = TREE_CHAIN (parm);
6633 if (DECL_NAME (parm) == 0)
6635 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6637 else if (TREE_CODE (parm) != PARM_DECL)
6641 storetags (chainon (parmtags, gettags ()));
6645 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6646 each with a parm name as the TREE_VALUE.
6648 PARMDECLS is a chain of declarations for parameters.
6649 Warning! It can also contain CONST_DECLs which are not parameters
6650 but are names of enumerators of any enum types
6651 declared among the parameters.
6653 First match each formal parameter name with its declaration.
6654 Associate decls with the names and store the decls
6655 into the TREE_PURPOSE slots. */
6657 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6658 DECL_RESULT (parm) = 0;
6660 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6662 register tree tail, found = NULL;
6664 if (TREE_VALUE (parm) == 0)
6666 error_with_decl (fndecl, "parameter name missing from parameter list");
6667 TREE_PURPOSE (parm) = 0;
6671 /* See if any of the parmdecls specifies this parm by name.
6672 Ignore any enumerator decls. */
6673 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6674 if (DECL_NAME (tail) == TREE_VALUE (parm)
6675 && TREE_CODE (tail) == PARM_DECL)
6681 /* If declaration already marked, we have a duplicate name.
6682 Complain, and don't use this decl twice. */
6683 if (found && DECL_RESULT (found) != 0)
6685 error_with_decl (found, "multiple parameters named `%s'");
6689 /* If the declaration says "void", complain and ignore it. */
6690 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6692 error_with_decl (found, "parameter `%s' declared void");
6693 TREE_TYPE (found) = integer_type_node;
6694 DECL_ARG_TYPE (found) = integer_type_node;
6695 layout_decl (found, 0);
6698 /* Traditionally, a parm declared float is actually a double. */
6699 if (found && flag_traditional
6700 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6702 TREE_TYPE (found) = double_type_node;
6703 DECL_ARG_TYPE (found) = double_type_node;
6704 layout_decl (found, 0);
6707 /* If no declaration found, default to int. */
6710 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6712 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6713 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6714 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6716 warning_with_decl (found, "type of `%s' defaults to `int'");
6720 TREE_PURPOSE (parm) = found;
6722 /* Mark this decl as "already found" -- see test, above.
6723 It is safe to use DECL_RESULT for this
6724 since it is not used in PARM_DECLs or CONST_DECLs. */
6725 DECL_RESULT (found) = error_mark_node;
6728 /* Put anything which is on the parmdecls chain and which is
6729 not a PARM_DECL onto the list NONPARMS. (The types of
6730 non-parm things which might appear on the list include
6731 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6732 any actual PARM_DECLs not matched with any names. */
6735 for (parm = parmdecls; parm; )
6737 tree next = TREE_CHAIN (parm);
6738 TREE_CHAIN (parm) = 0;
6740 if (TREE_CODE (parm) != PARM_DECL)
6741 nonparms = chainon (nonparms, parm);
6744 /* Complain about args with incomplete types. */
6745 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6747 error_with_decl (parm, "parameter `%s' has incomplete type");
6748 TREE_TYPE (parm) = error_mark_node;
6751 if (DECL_RESULT (parm) == 0)
6753 error_with_decl (parm,
6754 "declaration for parameter `%s' but no such parameter");
6755 /* Pretend the parameter was not missing.
6756 This gets us to a standard state and minimizes
6757 further error messages. */
6759 = chainon (specparms,
6760 tree_cons (parm, NULL_TREE, NULL_TREE));
6767 /* Chain the declarations together in the order of the list of names. */
6768 /* Store that chain in the function decl, replacing the list of names. */
6770 DECL_ARGUMENTS (fndecl) = 0;
6773 for (last = 0; parm; parm = TREE_CHAIN (parm))
6774 if (TREE_PURPOSE (parm))
6777 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6779 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6780 last = TREE_PURPOSE (parm);
6781 TREE_CHAIN (last) = 0;
6785 /* If there was a previous prototype,
6786 set the DECL_ARG_TYPE of each argument according to
6787 the type previously specified, and report any mismatches. */
6789 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6792 for (parm = DECL_ARGUMENTS (fndecl),
6793 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6794 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6795 != void_type_node));
6796 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6798 if (parm == 0 || type == 0
6799 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6801 error ("number of arguments doesn't match prototype");
6802 error_with_file_and_line (current_function_prototype_file,
6803 current_function_prototype_line,
6804 "prototype declaration");
6807 /* Type for passing arg must be consistent
6808 with that declared for the arg. */
6809 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6811 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6812 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6814 /* Adjust argument to match prototype. E.g. a previous
6815 `int foo(float);' prototype causes
6816 `int foo(x) float x; {...}' to be treated like
6817 `int foo(float x) {...}'. This is particularly
6818 useful for argument types like uid_t. */
6819 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6820 #ifdef PROMOTE_PROTOTYPES
6821 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6822 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6823 && TYPE_PRECISION (TREE_TYPE (parm))
6824 < TYPE_PRECISION (integer_type_node))
6825 DECL_ARG_TYPE (parm) = integer_type_node;
6829 pedwarn ("promoted argument `%s' doesn't match prototype",
6830 IDENTIFIER_POINTER (DECL_NAME (parm)));
6831 warning_with_file_and_line
6832 (current_function_prototype_file,
6833 current_function_prototype_line,
6834 "prototype declaration");
6837 /* If -traditional, allow `int' argument to match
6838 `unsigned' prototype. */
6839 else if (! (flag_traditional
6840 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6841 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6843 error ("argument `%s' doesn't match prototype",
6844 IDENTIFIER_POINTER (DECL_NAME (parm)));
6845 error_with_file_and_line (current_function_prototype_file,
6846 current_function_prototype_line,
6847 "prototype declaration");
6851 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6854 /* Otherwise, create a prototype that would match. */
6858 tree actual = 0, last = 0, type;
6860 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6862 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6865 TREE_CHAIN (last) = type;
6870 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6872 TREE_CHAIN (last) = type;
6876 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6877 of the type of this function, but we need to avoid having this
6878 affect the types of other similarly-typed functions, so we must
6879 first force the generation of an identical (but separate) type
6880 node for the relevant function type. The new node we create
6881 will be a variant of the main variant of the original function
6884 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6886 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6889 /* Now store the final chain of decls for the arguments
6890 as the decl-chain of the current lexical scope.
6891 Put the enumerators in as well, at the front so that
6892 DECL_ARGUMENTS is not modified. */
6894 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6897 /* Make sure the binding level for the top of the function body
6898 gets a BLOCK if there are any in the function.
6899 Otherwise, the dbx output is wrong. */
6901 keep_next_if_subblocks = 1;
6903 /* ??? This might be an improvement,
6904 but needs to be thought about some more. */
6906 keep_next_level_flag = 1;
6909 /* Write a record describing this function definition to the prototypes
6910 file (if requested). */
6912 gen_aux_info_record (fndecl, 1, 0, prototype);
6914 /* Initialize the RTL code for the function. */
6916 init_function_start (fndecl, input_filename, lineno);
6918 /* If this is a varargs function, inform function.c. */
6920 if (c_function_varargs)
6923 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6925 declare_function_name ();
6927 /* Set up parameters and prepare for return, for the function. */
6929 expand_function_start (fndecl, 0);
6931 /* If this function is `main', emit a call to `__main'
6932 to run global initializers, etc. */
6933 if (DECL_NAME (fndecl)
6934 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6935 && DECL_CONTEXT (fndecl) == NULL_TREE)
6936 expand_main_function ();
6939 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6940 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6941 stands for an ellipsis in the identifier list.
6943 PARMLIST is the data returned by get_parm_info for the
6944 parmlist that follows the semicolon.
6946 We return a value of the same sort that get_parm_info returns,
6947 except that it describes the combination of identifiers and parmlist. */
6950 combine_parm_decls (specparms, parmlist, void_at_end)
6951 tree specparms, parmlist;
6954 register tree fndecl = current_function_decl;
6957 tree parmdecls = TREE_PURPOSE (parmlist);
6959 /* This is a chain of any other decls that came in among the parm
6960 declarations. They were separated already by get_parm_info,
6961 so we just need to keep them separate. */
6962 tree nonparms = TREE_VALUE (parmlist);
6966 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6967 DECL_RESULT (parm) = 0;
6969 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6971 register tree tail, found = NULL;
6973 /* See if any of the parmdecls specifies this parm by name. */
6974 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6975 if (DECL_NAME (tail) == TREE_VALUE (parm))
6981 /* If declaration already marked, we have a duplicate name.
6982 Complain, and don't use this decl twice. */
6983 if (found && DECL_RESULT (found) != 0)
6985 error_with_decl (found, "multiple parameters named `%s'");
6989 /* If the declaration says "void", complain and ignore it. */
6990 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6992 error_with_decl (found, "parameter `%s' declared void");
6993 TREE_TYPE (found) = integer_type_node;
6994 DECL_ARG_TYPE (found) = integer_type_node;
6995 layout_decl (found, 0);
6998 /* Traditionally, a parm declared float is actually a double. */
6999 if (found && flag_traditional
7000 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7002 TREE_TYPE (found) = double_type_node;
7003 DECL_ARG_TYPE (found) = double_type_node;
7004 layout_decl (found, 0);
7007 /* If no declaration found, default to int. */
7010 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7012 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7013 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7014 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7015 error_with_decl (found, "type of parameter `%s' is not declared");
7019 TREE_PURPOSE (parm) = found;
7021 /* Mark this decl as "already found" -- see test, above.
7022 It is safe to use DECL_RESULT for this
7023 since it is not used in PARM_DECLs or CONST_DECLs. */
7024 DECL_RESULT (found) = error_mark_node;
7027 /* Complain about any actual PARM_DECLs not matched with any names. */
7029 for (parm = parmdecls; parm; )
7031 tree next = TREE_CHAIN (parm);
7032 TREE_CHAIN (parm) = 0;
7034 /* Complain about args with incomplete types. */
7035 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7037 error_with_decl (parm, "parameter `%s' has incomplete type");
7038 TREE_TYPE (parm) = error_mark_node;
7041 if (DECL_RESULT (parm) == 0)
7043 error_with_decl (parm,
7044 "declaration for parameter `%s' but no such parameter");
7045 /* Pretend the parameter was not missing.
7046 This gets us to a standard state and minimizes
7047 further error messages. */
7049 = chainon (specparms,
7050 tree_cons (parm, NULL_TREE, NULL_TREE));
7056 /* Chain the declarations together in the order of the list of names.
7057 At the same time, build up a list of their types, in reverse order. */
7063 for (last = 0; parm; parm = TREE_CHAIN (parm))
7064 if (TREE_PURPOSE (parm))
7067 parmdecls = TREE_PURPOSE (parm);
7069 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7070 last = TREE_PURPOSE (parm);
7071 TREE_CHAIN (last) = 0;
7073 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7078 return saveable_tree_cons (parmdecls, nonparms,
7079 nreverse (saveable_tree_cons (NULL_TREE,
7083 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7086 /* Finish up a function declaration and compile that function
7087 all the way to assembler language output. The free the storage
7088 for the function definition.
7090 This is called after parsing the body of the function definition.
7092 NESTED is nonzero if the function being finished is nested in another. */
7095 finish_function (nested)
7098 register tree fndecl = current_function_decl;
7100 /* TREE_READONLY (fndecl) = 1;
7101 This caused &foo to be of type ptr-to-const-function
7102 which then got a warning when stored in a ptr-to-function variable. */
7105 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7107 /* Must mark the RESULT_DECL as being in this function. */
7109 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7111 /* Obey `register' declarations if `setjmp' is called in this fn. */
7112 if (flag_traditional && current_function_calls_setjmp)
7114 setjmp_protect (DECL_INITIAL (fndecl));
7115 setjmp_protect_args ();
7118 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7120 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7121 != integer_type_node)
7123 /* You would expect the sense of this test to be the other way
7124 around, but if warn_main is set, we will already have warned,
7125 so this would be a duplicate. This is the warning you get
7126 in some environments even if you *don't* ask for it, because
7127 these are environments where it may be more of a problem than
7130 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7134 #ifdef DEFAULT_MAIN_RETURN
7135 /* Make it so that `main' always returns success by default. */
7136 DEFAULT_MAIN_RETURN;
7141 /* Generate rtl for function exit. */
7142 expand_function_end (input_filename, lineno, 0);
7144 /* So we can tell if jump_optimize sets it to 1. */
7147 /* Run the optimizers and output the assembler code for this function. */
7148 rest_of_compilation (fndecl);
7150 current_function_returns_null |= can_reach_end;
7152 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7153 warning ("`noreturn' function does return");
7154 else if (warn_return_type && can_reach_end
7155 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7156 /* If this function returns non-void and control can drop through,
7158 warning ("control reaches end of non-void function");
7159 /* With just -W, complain only if function returns both with
7160 and without a value. */
7161 else if (extra_warnings
7162 && current_function_returns_value && current_function_returns_null)
7163 warning ("this function may return with or without a value");
7165 /* If requested, warn about function definitions where the function will
7166 return a value (usually of some struct or union type) which itself will
7167 take up a lot of stack space. */
7169 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7171 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7175 register tree ret_type_size = TYPE_SIZE (ret_type);
7177 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7180 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7182 if (units > larger_than_size)
7183 warning_with_decl (fndecl,
7184 "size of return value of `%s' is %u bytes",
7190 /* Free all the tree nodes making up this function. */
7191 /* Switch back to allocating nodes permanently
7192 until we start another function. */
7194 permanent_allocation (1);
7196 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7198 /* Stop pointing to the local nodes about to be freed. */
7199 /* But DECL_INITIAL must remain nonzero so we know this
7200 was an actual function definition. */
7201 /* For a nested function, this is done in pop_c_function_context. */
7202 /* If rest_of_compilation set this to 0, leave it 0. */
7203 if (DECL_INITIAL (fndecl) != 0)
7204 DECL_INITIAL (fndecl) = error_mark_node;
7205 DECL_ARGUMENTS (fndecl) = 0;
7208 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7210 #ifndef ASM_OUTPUT_CONSTRUCTOR
7211 if (! flag_gnu_linker)
7212 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7215 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7217 if (DECL_STATIC_DESTRUCTOR (fndecl))
7219 #ifndef ASM_OUTPUT_DESTRUCTOR
7220 if (! flag_gnu_linker)
7221 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7224 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7229 /* Let the error reporting routines know that we're outside a
7230 function. For a nested function, this value is used in
7231 pop_c_function_context and then reset via pop_function_context. */
7232 current_function_decl = NULL;
7236 /* Save and restore the variables in this file and elsewhere
7237 that keep track of the progress of compilation of the current function.
7238 Used for nested functions. */
7242 struct c_function *next;
7244 tree shadowed_labels;
7247 int warn_about_return_type;
7249 struct binding_level *binding_level;
7252 struct c_function *c_function_chain;
7254 /* Save and reinitialize the variables
7255 used during compilation of a C function. */
7258 push_c_function_context ()
7260 struct c_function *p
7261 = (struct c_function *) xmalloc (sizeof (struct c_function));
7264 pedwarn ("ANSI C forbids nested functions");
7266 push_function_context ();
7268 p->next = c_function_chain;
7269 c_function_chain = p;
7271 p->named_labels = named_labels;
7272 p->shadowed_labels = shadowed_labels;
7273 p->returns_value = current_function_returns_value;
7274 p->returns_null = current_function_returns_null;
7275 p->warn_about_return_type = warn_about_return_type;
7276 p->extern_inline = current_extern_inline;
7277 p->binding_level = current_binding_level;
7280 /* Restore the variables used during compilation of a C function. */
7283 pop_c_function_context ()
7285 struct c_function *p = c_function_chain;
7288 /* Bring back all the labels that were shadowed. */
7289 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7290 if (DECL_NAME (TREE_VALUE (link)) != 0)
7291 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7292 = TREE_VALUE (link);
7294 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7296 /* Stop pointing to the local nodes about to be freed. */
7297 /* But DECL_INITIAL must remain nonzero so we know this
7298 was an actual function definition. */
7299 DECL_INITIAL (current_function_decl) = error_mark_node;
7300 DECL_ARGUMENTS (current_function_decl) = 0;
7303 pop_function_context ();
7305 c_function_chain = p->next;
7307 named_labels = p->named_labels;
7308 shadowed_labels = p->shadowed_labels;
7309 current_function_returns_value = p->returns_value;
7310 current_function_returns_null = p->returns_null;
7311 warn_about_return_type = p->warn_about_return_type;
7312 current_extern_inline = p->extern_inline;
7313 current_binding_level = p->binding_level;
7318 /* integrate_decl_tree calls this function, but since we don't use the
7319 DECL_LANG_SPECIFIC field, this is a no-op. */
7322 copy_lang_decl (node)
7323 tree node ATTRIBUTE_UNUSED;