1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92, 93, 94, 95, 96, 1997 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. */
37 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
39 { NORMAL, /* Ordinary declaration */
40 FUNCDEF, /* Function definition */
41 PARM, /* Declaration of parm before function body */
42 FIELD, /* Declaration inside struct or union */
43 BITFIELD, /* Likewise but with specified width */
44 TYPENAME}; /* Typename (inside cast or sizeof) */
46 #ifndef CHAR_TYPE_SIZE
47 #define CHAR_TYPE_SIZE BITS_PER_UNIT
50 #ifndef SHORT_TYPE_SIZE
51 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
55 #define INT_TYPE_SIZE BITS_PER_WORD
58 #ifndef LONG_TYPE_SIZE
59 #define LONG_TYPE_SIZE BITS_PER_WORD
62 #ifndef LONG_LONG_TYPE_SIZE
63 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
66 #ifndef WCHAR_UNSIGNED
67 #define WCHAR_UNSIGNED 0
70 #ifndef FLOAT_TYPE_SIZE
71 #define FLOAT_TYPE_SIZE BITS_PER_WORD
74 #ifndef DOUBLE_TYPE_SIZE
75 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
78 #ifndef LONG_DOUBLE_TYPE_SIZE
79 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
82 /* We let tm.h override the types used here, to handle trivial differences
83 such as the choice of unsigned int or long unsigned int for size_t.
84 When machines start needing nontrivial differences in the size type,
85 it would be best to do something here to figure out automatically
86 from other information what type to use. */
89 #define SIZE_TYPE "long unsigned int"
93 #define PTRDIFF_TYPE "long int"
97 #define WCHAR_TYPE "int"
100 /* a node which has tree code ERROR_MARK, and whose type is itself.
101 All erroneous expressions are replaced with this node. All functions
102 that accept nodes as arguments should avoid generating error messages
103 if this node is one of the arguments, since it is undesirable to get
104 multiple error messages from one error in the input. */
106 tree error_mark_node;
108 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
110 tree short_integer_type_node;
111 tree integer_type_node;
112 tree long_integer_type_node;
113 tree long_long_integer_type_node;
115 tree short_unsigned_type_node;
116 tree unsigned_type_node;
117 tree long_unsigned_type_node;
118 tree long_long_unsigned_type_node;
120 tree boolean_type_node;
121 tree boolean_false_node;
122 tree boolean_true_node;
124 tree ptrdiff_type_node;
126 tree unsigned_char_type_node;
127 tree signed_char_type_node;
129 tree wchar_type_node;
130 tree signed_wchar_type_node;
131 tree unsigned_wchar_type_node;
133 tree float_type_node;
134 tree double_type_node;
135 tree long_double_type_node;
137 tree complex_integer_type_node;
138 tree complex_float_type_node;
139 tree complex_double_type_node;
140 tree complex_long_double_type_node;
142 tree intQI_type_node;
143 tree intHI_type_node;
144 tree intSI_type_node;
145 tree intDI_type_node;
147 tree unsigned_intQI_type_node;
148 tree unsigned_intHI_type_node;
149 tree unsigned_intSI_type_node;
150 tree unsigned_intDI_type_node;
152 /* a VOID_TYPE node. */
156 /* Nodes for types `void *' and `const void *'. */
158 tree ptr_type_node, const_ptr_type_node;
160 /* Nodes for types `char *' and `const char *'. */
162 tree string_type_node, const_string_type_node;
164 /* Type `char[SOMENUMBER]'.
165 Used when an array of char is needed and the size is irrelevant. */
167 tree char_array_type_node;
169 /* Type `int[SOMENUMBER]' or something like it.
170 Used when an array of int needed and the size is irrelevant. */
172 tree int_array_type_node;
174 /* Type `wchar_t[SOMENUMBER]' or something like it.
175 Used when a wide string literal is created. */
177 tree wchar_array_type_node;
179 /* type `int ()' -- used for implicit declaration of functions. */
181 tree default_function_type;
183 /* function types `double (double)' and `double (double, double)', etc. */
185 tree double_ftype_double, double_ftype_double_double;
186 tree int_ftype_int, long_ftype_long;
187 tree float_ftype_float;
188 tree ldouble_ftype_ldouble;
190 /* Function type `void (void *, void *, int)' and similar ones */
192 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
194 /* Function type `char *(char *, char *)' and similar ones */
195 tree string_ftype_ptr_ptr, int_ftype_string_string;
197 /* Function type `int (const void *, const void *, size_t)' */
198 tree int_ftype_cptr_cptr_sizet;
200 /* Two expressions that are constants with value zero.
201 The first is of type `int', the second of type `void *'. */
203 tree integer_zero_node;
204 tree null_pointer_node;
206 /* A node for the integer constant 1. */
208 tree integer_one_node;
210 /* Nonzero if we have seen an invalid cross reference
211 to a struct, union, or enum, but not yet printed the message. */
213 tree pending_invalid_xref;
214 /* File and line to appear in the eventual error message. */
215 char *pending_invalid_xref_file;
216 int pending_invalid_xref_line;
218 /* While defining an enum type, this is 1 plus the last enumerator
219 constant value. Note that will do not have to save this or `enum_overflow'
220 around nested function definition since such a definition could only
221 occur in an enum value expression and we don't use these variables in
224 static tree enum_next_value;
226 /* Nonzero means that there was overflow computing enum_next_value. */
228 static int enum_overflow;
230 /* Parsing a function declarator leaves a list of parameter names
231 or a chain or parameter decls here. */
233 static tree last_function_parms;
235 /* Parsing a function declarator leaves here a chain of structure
236 and enum types declared in the parmlist. */
238 static tree last_function_parm_tags;
240 /* After parsing the declarator that starts a function definition,
241 `start_function' puts here the list of parameter names or chain of decls.
242 `store_parm_decls' finds it here. */
244 static tree current_function_parms;
246 /* Similar, for last_function_parm_tags. */
247 static tree current_function_parm_tags;
249 /* Similar, for the file and line that the prototype came from if this is
250 an old-style definition. */
251 static char *current_function_prototype_file;
252 static int current_function_prototype_line;
254 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
255 that have names. Here so we can clear out their names' definitions
256 at the end of the function. */
258 static tree named_labels;
260 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
262 static tree shadowed_labels;
264 /* Nonzero when store_parm_decls is called indicates a varargs function.
265 Value not meaningful after store_parm_decls. */
267 static int c_function_varargs;
269 /* The FUNCTION_DECL for the function currently being compiled,
270 or 0 if between functions. */
271 tree current_function_decl;
273 /* Set to 0 at beginning of a function definition, set to 1 if
274 a return statement that specifies a return value is seen. */
276 int current_function_returns_value;
278 /* Set to 0 at beginning of a function definition, set to 1 if
279 a return statement with no argument is seen. */
281 int current_function_returns_null;
283 /* Set to nonzero by `grokdeclarator' for a function
284 whose return type is defaulted, if warnings for this are desired. */
286 static int warn_about_return_type;
288 /* Nonzero when starting a function declared `extern inline'. */
290 static int current_extern_inline;
292 /* For each binding contour we allocate a binding_level structure
293 * which records the names defined in that contour.
296 * 1) one for each function definition,
297 * where internal declarations of the parameters appear.
298 * 2) one for each compound statement,
299 * to record its declarations.
301 * The current meaning of a name can be found by searching the levels from
302 * the current one out to the global one.
305 /* Note that the information in the `names' component of the global contour
306 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
310 /* A chain of _DECL nodes for all variables, constants, functions,
311 and typedef types. These are in the reverse of the order supplied.
315 /* A list of structure, union and enum definitions,
316 * for looking up tag names.
317 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
318 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
319 * or ENUMERAL_TYPE node.
323 /* For each level, a list of shadowed outer-level local definitions
324 to be restored when this level is popped.
325 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
326 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
329 /* For each level (except not the global one),
330 a chain of BLOCK nodes for all the levels
331 that were entered and exited one level down. */
334 /* The BLOCK node for this level, if one has been preallocated.
335 If 0, the BLOCK is allocated (if needed) when the level is popped. */
338 /* The binding level which this one is contained in (inherits from). */
339 struct binding_level *level_chain;
341 /* Nonzero for the level that holds the parameters of a function. */
344 /* Nonzero if this level "doesn't exist" for tags. */
345 char tag_transparent;
347 /* Nonzero if sublevels of this level "don't exist" for tags.
348 This is set in the parm level of a function definition
349 while reading the function body, so that the outermost block
350 of the function body will be tag-transparent. */
351 char subblocks_tag_transparent;
353 /* Nonzero means make a BLOCK for this level regardless of all else. */
356 /* Nonzero means make a BLOCK if this level has any subblocks. */
357 char keep_if_subblocks;
359 /* Number of decls in `names' that have incomplete
360 structure or union types. */
363 /* A list of decls giving the (reversed) specified order of parms,
364 not including any forward-decls in the parmlist.
365 This is so we can put the parms in proper order for assign_parms. */
369 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
371 /* The binding level currently in effect. */
373 static struct binding_level *current_binding_level;
375 /* A chain of binding_level structures awaiting reuse. */
377 static struct binding_level *free_binding_level;
379 /* The outermost binding level, for names of file scope.
380 This is created when the compiler is started and exists
381 through the entire run. */
383 static struct binding_level *global_binding_level;
385 /* Binding level structures are initialized by copying this one. */
387 static struct binding_level clear_binding_level
388 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
391 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
393 static int keep_next_level_flag;
395 /* Nonzero means make a BLOCK for the next level pushed
396 if it has subblocks. */
398 static int keep_next_if_subblocks;
400 /* The chain of outer levels of label scopes.
401 This uses the same data structure used for binding levels,
402 but it works differently: each link in the chain records
403 saved values of named_labels and shadowed_labels for
404 a label binding level outside the current one. */
406 static struct binding_level *label_level_chain;
408 /* Functions called automatically at the beginning and end of execution. */
410 tree static_ctors, static_dtors;
412 /* Forward declarations. */
414 static struct binding_level * make_binding_level PROTO((void));
415 static void clear_limbo_values PROTO((tree));
416 static int duplicate_decls PROTO((tree, tree, int));
417 static char *redeclaration_error_message PROTO((tree, tree));
418 static void storedecls PROTO((tree));
419 static void storetags PROTO((tree));
420 static tree lookup_tag PROTO((enum tree_code, tree,
421 struct binding_level *, int));
422 static tree lookup_tag_reverse PROTO((tree));
423 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
425 static tree grokparms PROTO((tree, int));
426 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
427 static void layout_array_type PROTO((tree));
429 /* C-specific option variables. */
431 /* Nonzero means allow type mismatches in conditional expressions;
432 just make their values `void'. */
434 int flag_cond_mismatch;
436 /* Nonzero means give `double' the same size as `float'. */
438 int flag_short_double;
440 /* Nonzero means don't recognize the keyword `asm'. */
444 /* Nonzero means don't recognize any builtin functions. */
448 /* Nonzero means don't recognize the non-ANSI builtin functions.
451 int flag_no_nonansi_builtin;
453 /* Nonzero means do some things the same way PCC does. */
455 int flag_traditional;
457 /* Nonzero means that we have builtin functions, and main is an int */
461 /* Nonzero means to allow single precision math even if we're generally
462 being traditional. */
463 int flag_allow_single_precision = 0;
465 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
467 int flag_signed_bitfields = 1;
468 int explicit_flag_signed_bitfields = 0;
470 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
472 int flag_no_ident = 0;
474 /* Nonzero means warn about use of implicit int. */
476 int warn_implicit_int;
478 /* Nonzero means message about use of implicit function declarations;
479 1 means warning; 2 means error. */
481 int mesg_implicit_function_declaration;
483 /* Nonzero means give string constants the type `const char *'
484 to get extra warnings from them. These warnings will be too numerous
485 to be useful, except in thoroughly ANSIfied programs. */
487 int warn_write_strings;
489 /* Nonzero means warn about pointer casts that can drop a type qualifier
490 from the pointer target type. */
494 /* Nonzero means warn when casting a function call to a type that does
495 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
496 when there is no previous declaration of sqrt or malloc. */
498 int warn_bad_function_cast;
500 /* Warn about traditional constructs whose meanings changed in ANSI C. */
502 int warn_traditional;
504 /* Nonzero means warn about sizeof(function) or addition/subtraction
505 of function pointers. */
507 int warn_pointer_arith;
509 /* Nonzero means warn for non-prototype function decls
510 or non-prototyped defs without previous prototype. */
512 int warn_strict_prototypes;
514 /* Nonzero means warn for any global function def
515 without separate previous prototype decl. */
517 int warn_missing_prototypes;
519 /* Nonzero means warn for any global function def
520 without separate previous decl. */
522 int warn_missing_declarations;
524 /* Nonzero means warn about multiple (redundant) decls for the same single
525 variable or function. */
527 int warn_redundant_decls = 0;
529 /* Nonzero means warn about extern declarations of objects not at
530 file-scope level and about *all* declarations of functions (whether
531 extern or static) not at file-scope level. Note that we exclude
532 implicit function declarations. To get warnings about those, use
535 int warn_nested_externs = 0;
537 /* Warn about *printf or *scanf format/argument anomalies. */
541 /* Warn about a subscript that has type char. */
543 int warn_char_subscripts = 0;
545 /* Warn if a type conversion is done that might have confusing results. */
549 /* Warn if adding () is suggested. */
551 int warn_parentheses;
553 /* Warn if initializer is not completely bracketed. */
555 int warn_missing_braces;
557 /* Warn if main is suspicious. */
561 /* Warn about #pragma directives that are not recognised. */
563 int warn_unknown_pragmas = 0; /* Tri state variable. */
565 /* Warn about comparison of signed and unsigned values.
566 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
568 int warn_sign_compare = -1;
570 /* Nonzero means `$' can be in an identifier. */
572 #ifndef DOLLARS_IN_IDENTIFIERS
573 #define DOLLARS_IN_IDENTIFIERS 1
575 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
577 /* Decode the string P as a language-specific option for C.
578 Return 1 if it is recognized (and handle it);
579 return 0 if not recognized. */
585 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
587 flag_traditional = 1;
588 flag_writable_strings = 1;
590 else if (!strcmp (p, "-fallow-single-precision"))
591 flag_allow_single_precision = 1;
592 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
597 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
601 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
605 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
607 flag_traditional = 0;
608 flag_writable_strings = 0;
610 else if (!strcmp (p, "-fdollars-in-identifiers"))
611 dollars_in_ident = 1;
612 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
613 dollars_in_ident = 0;
614 else if (!strcmp (p, "-fsigned-char"))
615 flag_signed_char = 1;
616 else if (!strcmp (p, "-funsigned-char"))
617 flag_signed_char = 0;
618 else if (!strcmp (p, "-fno-signed-char"))
619 flag_signed_char = 0;
620 else if (!strcmp (p, "-fno-unsigned-char"))
621 flag_signed_char = 1;
622 else if (!strcmp (p, "-fsigned-bitfields")
623 || !strcmp (p, "-fno-unsigned-bitfields"))
625 flag_signed_bitfields = 1;
626 explicit_flag_signed_bitfields = 1;
628 else if (!strcmp (p, "-funsigned-bitfields")
629 || !strcmp (p, "-fno-signed-bitfields"))
631 flag_signed_bitfields = 0;
632 explicit_flag_signed_bitfields = 1;
634 else if (!strcmp (p, "-fshort-enums"))
635 flag_short_enums = 1;
636 else if (!strcmp (p, "-fno-short-enums"))
637 flag_short_enums = 0;
638 else if (!strcmp (p, "-fcond-mismatch"))
639 flag_cond_mismatch = 1;
640 else if (!strcmp (p, "-fno-cond-mismatch"))
641 flag_cond_mismatch = 0;
642 else if (!strcmp (p, "-fshort-double"))
643 flag_short_double = 1;
644 else if (!strcmp (p, "-fno-short-double"))
645 flag_short_double = 0;
646 else if (!strcmp (p, "-fasm"))
648 else if (!strcmp (p, "-fno-asm"))
650 else if (!strcmp (p, "-fbuiltin"))
652 else if (!strcmp (p, "-fno-builtin"))
654 else if (!strcmp (p, "-fno-ident"))
656 else if (!strcmp (p, "-fident"))
658 else if (!strcmp (p, "-ansi"))
659 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
660 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
661 mesg_implicit_function_declaration = 2;
662 else if (!strcmp (p, "-Wimplicit-function-declaration"))
663 mesg_implicit_function_declaration = 1;
664 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
665 mesg_implicit_function_declaration = 0;
666 else if (!strcmp (p, "-Wimplicit-int"))
667 warn_implicit_int = 1;
668 else if (!strcmp (p, "-Wno-implicit-int"))
669 warn_implicit_int = 0;
670 else if (!strcmp (p, "-Wimplicit"))
672 warn_implicit_int = 1;
673 if (mesg_implicit_function_declaration != 2)
674 mesg_implicit_function_declaration = 1;
676 else if (!strcmp (p, "-Wno-implicit"))
677 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
678 else if (!strcmp (p, "-Wwrite-strings"))
679 warn_write_strings = 1;
680 else if (!strcmp (p, "-Wno-write-strings"))
681 warn_write_strings = 0;
682 else if (!strcmp (p, "-Wcast-qual"))
684 else if (!strcmp (p, "-Wno-cast-qual"))
686 else if (!strcmp (p, "-Wbad-function-cast"))
687 warn_bad_function_cast = 1;
688 else if (!strcmp (p, "-Wno-bad-function-cast"))
689 warn_bad_function_cast = 0;
690 else if (!strcmp (p, "-Wpointer-arith"))
691 warn_pointer_arith = 1;
692 else if (!strcmp (p, "-Wno-pointer-arith"))
693 warn_pointer_arith = 0;
694 else if (!strcmp (p, "-Wstrict-prototypes"))
695 warn_strict_prototypes = 1;
696 else if (!strcmp (p, "-Wno-strict-prototypes"))
697 warn_strict_prototypes = 0;
698 else if (!strcmp (p, "-Wmissing-prototypes"))
699 warn_missing_prototypes = 1;
700 else if (!strcmp (p, "-Wno-missing-prototypes"))
701 warn_missing_prototypes = 0;
702 else if (!strcmp (p, "-Wmissing-declarations"))
703 warn_missing_declarations = 1;
704 else if (!strcmp (p, "-Wno-missing-declarations"))
705 warn_missing_declarations = 0;
706 else if (!strcmp (p, "-Wredundant-decls"))
707 warn_redundant_decls = 1;
708 else if (!strcmp (p, "-Wno-redundant-decls"))
709 warn_redundant_decls = 0;
710 else if (!strcmp (p, "-Wnested-externs"))
711 warn_nested_externs = 1;
712 else if (!strcmp (p, "-Wno-nested-externs"))
713 warn_nested_externs = 0;
714 else if (!strcmp (p, "-Wtraditional"))
715 warn_traditional = 1;
716 else if (!strcmp (p, "-Wno-traditional"))
717 warn_traditional = 0;
718 else if (!strcmp (p, "-Wformat"))
720 else if (!strcmp (p, "-Wno-format"))
722 else if (!strcmp (p, "-Wchar-subscripts"))
723 warn_char_subscripts = 1;
724 else if (!strcmp (p, "-Wno-char-subscripts"))
725 warn_char_subscripts = 0;
726 else if (!strcmp (p, "-Wconversion"))
728 else if (!strcmp (p, "-Wno-conversion"))
730 else if (!strcmp (p, "-Wparentheses"))
731 warn_parentheses = 1;
732 else if (!strcmp (p, "-Wno-parentheses"))
733 warn_parentheses = 0;
734 else if (!strcmp (p, "-Wreturn-type"))
735 warn_return_type = 1;
736 else if (!strcmp (p, "-Wno-return-type"))
737 warn_return_type = 0;
738 else if (!strcmp (p, "-Wcomment"))
739 ; /* cpp handles this one. */
740 else if (!strcmp (p, "-Wno-comment"))
741 ; /* cpp handles this one. */
742 else if (!strcmp (p, "-Wcomments"))
743 ; /* cpp handles this one. */
744 else if (!strcmp (p, "-Wno-comments"))
745 ; /* cpp handles this one. */
746 else if (!strcmp (p, "-Wtrigraphs"))
747 ; /* cpp handles this one. */
748 else if (!strcmp (p, "-Wno-trigraphs"))
749 ; /* cpp handles this one. */
750 else if (!strcmp (p, "-Wundef"))
751 ; /* cpp handles this one. */
752 else if (!strcmp (p, "-Wno-undef"))
753 ; /* cpp handles this one. */
754 else if (!strcmp (p, "-Wimport"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p, "-Wno-import"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p, "-Wmissing-braces"))
759 warn_missing_braces = 1;
760 else if (!strcmp (p, "-Wno-missing-braces"))
761 warn_missing_braces = 0;
762 else if (!strcmp (p, "-Wmain"))
764 else if (!strcmp (p, "-Wno-main"))
766 else if (!strcmp (p, "-Wsign-compare"))
767 warn_sign_compare = 1;
768 else if (!strcmp (p, "-Wno-sign-compare"))
769 warn_sign_compare = 0;
770 else if (!strcmp (p, "-Wunknown-pragmas"))
771 /* Set to greater than 1, so that even unknown pragmas in system
772 headers will be warned about. */
773 warn_unknown_pragmas = 2;
774 else if (!strcmp (p, "-Wno-unknown-pragmas"))
775 warn_unknown_pragmas = 0;
776 else if (!strcmp (p, "-Wall"))
778 /* We save the value of warn_uninitialized, since if they put
779 -Wuninitialized on the command line, we need to generate a
780 warning about not using it without also specifying -O. */
781 if (warn_uninitialized != 1)
782 warn_uninitialized = 2;
783 warn_implicit_int = 1;
784 mesg_implicit_function_declaration = 1;
785 warn_return_type = 1;
789 warn_char_subscripts = 1;
790 warn_parentheses = 1;
791 warn_missing_braces = 1;
792 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
793 it off only if it's not explicit. */
795 /* Only warn about unknown pragmas that are not in system headers. */
796 warn_unknown_pragmas = 1;
804 /* Hooks for print_node. */
807 print_lang_decl (file, node, indent)
815 print_lang_type (file, node, indent)
823 print_lang_identifier (file, node, indent)
828 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
829 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
830 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
831 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
832 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
833 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
836 /* Hook called at end of compilation to assume 1 elt
837 for a top-level array decl that wasn't complete before. */
840 finish_incomplete_decl (decl)
843 if (TREE_CODE (decl) == VAR_DECL)
845 tree type = TREE_TYPE (decl);
846 if (type != error_mark_node
847 && TREE_CODE (type) == ARRAY_TYPE
848 && TYPE_DOMAIN (type) == 0)
850 if (! DECL_EXTERNAL (decl))
851 warning_with_decl (decl, "array `%s' assumed to have one element");
853 complete_array_type (type, NULL_TREE, 1);
855 layout_decl (decl, 0);
860 /* Create a new `struct binding_level'. */
863 struct binding_level *
864 make_binding_level ()
867 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
870 /* Nonzero if we are currently in the global binding level. */
875 return current_binding_level == global_binding_level;
881 keep_next_level_flag = 1;
884 /* Nonzero if the current level needs to have a BLOCK made. */
889 return ((current_binding_level->keep_if_subblocks
890 && current_binding_level->blocks != 0)
891 || current_binding_level->keep
892 || current_binding_level->names != 0
893 || (current_binding_level->tags != 0
894 && !current_binding_level->tag_transparent));
897 /* Identify this binding level as a level of parameters.
898 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
899 But it turns out there is no way to pass the right value for
900 DEFINITION_FLAG, so we ignore it. */
903 declare_parm_level (definition_flag)
906 current_binding_level->parm_flag = 1;
909 /* Nonzero if currently making parm declarations. */
914 return current_binding_level->parm_flag;
917 /* Enter a new binding level.
918 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
919 not for that of tags. */
922 pushlevel (tag_transparent)
925 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
927 /* If this is the top level of a function,
928 just make sure that NAMED_LABELS is 0. */
930 if (current_binding_level == global_binding_level)
935 /* Reuse or create a struct for this binding level. */
937 if (free_binding_level)
939 newlevel = free_binding_level;
940 free_binding_level = free_binding_level->level_chain;
944 newlevel = make_binding_level ();
947 /* Add this level to the front of the chain (stack) of levels that
950 *newlevel = clear_binding_level;
951 newlevel->tag_transparent
953 || (current_binding_level
954 ? current_binding_level->subblocks_tag_transparent
956 newlevel->level_chain = current_binding_level;
957 current_binding_level = newlevel;
958 newlevel->keep = keep_next_level_flag;
959 keep_next_level_flag = 0;
960 newlevel->keep_if_subblocks = keep_next_if_subblocks;
961 keep_next_if_subblocks = 0;
964 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
967 clear_limbo_values (block)
972 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
973 if (DECL_NAME (tem) != 0)
974 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
976 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
977 clear_limbo_values (tem);
980 /* Exit a binding level.
981 Pop the level off, and restore the state of the identifier-decl mappings
982 that were in effect when this level was entered.
984 If KEEP is nonzero, this level had explicit declarations, so
985 and create a "block" (a BLOCK node) for the level
986 to record its declarations and subblocks for symbol table output.
988 If FUNCTIONBODY is nonzero, this level is the body of a function,
989 so create a block as if KEEP were set and also clear out all
992 If REVERSE is nonzero, reverse the order of decls before putting
993 them into the BLOCK. */
996 poplevel (keep, reverse, functionbody)
1002 /* The chain of decls was accumulated in reverse order.
1003 Put it into forward order, just for cleanliness. */
1005 tree tags = current_binding_level->tags;
1006 tree subblocks = current_binding_level->blocks;
1009 int block_previously_created;
1011 keep |= current_binding_level->keep;
1013 /* This warning is turned off because it causes warnings for
1014 declarations like `extern struct foo *x'. */
1016 /* Warn about incomplete structure types in this level. */
1017 for (link = tags; link; link = TREE_CHAIN (link))
1018 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1020 tree type = TREE_VALUE (link);
1022 switch (TREE_CODE (type))
1025 errmsg = "`struct %s' incomplete in scope ending here";
1028 errmsg = "`union %s' incomplete in scope ending here";
1031 errmsg = "`enum %s' incomplete in scope ending here";
1034 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1035 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1037 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1038 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1042 /* Get the decls in the order they were written.
1043 Usually current_binding_level->names is in reverse order.
1044 But parameter decls were previously put in forward order. */
1047 current_binding_level->names
1048 = decls = nreverse (current_binding_level->names);
1050 decls = current_binding_level->names;
1052 /* Output any nested inline functions within this block
1053 if they weren't already output. */
1055 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1056 if (TREE_CODE (decl) == FUNCTION_DECL
1057 && ! TREE_ASM_WRITTEN (decl)
1058 && DECL_INITIAL (decl) != 0
1059 && TREE_ADDRESSABLE (decl))
1061 /* If this decl was copied from a file-scope decl
1062 on account of a block-scope extern decl,
1063 propagate TREE_ADDRESSABLE to the file-scope decl.
1065 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1066 true, since then the decl goes through save_for_inline_copying. */
1067 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1068 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1069 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1070 else if (DECL_SAVED_INSNS (decl) != 0)
1072 push_function_context ();
1073 output_inline_function (decl);
1074 pop_function_context ();
1078 /* If there were any declarations or structure tags in that level,
1079 or if this level is a function body,
1080 create a BLOCK to record them for the life of this function. */
1083 block_previously_created = (current_binding_level->this_block != 0);
1084 if (block_previously_created)
1085 block = current_binding_level->this_block;
1086 else if (keep || functionbody
1087 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1088 block = make_node (BLOCK);
1091 BLOCK_VARS (block) = decls;
1092 BLOCK_TYPE_TAGS (block) = tags;
1093 BLOCK_SUBBLOCKS (block) = subblocks;
1094 remember_end_note (block);
1097 /* In each subblock, record that this is its superior. */
1099 for (link = subblocks; link; link = TREE_CHAIN (link))
1100 BLOCK_SUPERCONTEXT (link) = block;
1102 /* Clear out the meanings of the local variables of this level. */
1104 for (link = decls; link; link = TREE_CHAIN (link))
1106 if (DECL_NAME (link) != 0)
1108 /* If the ident. was used or addressed via a local extern decl,
1109 don't forget that fact. */
1110 if (DECL_EXTERNAL (link))
1112 if (TREE_USED (link))
1113 TREE_USED (DECL_NAME (link)) = 1;
1114 if (TREE_ADDRESSABLE (link))
1115 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1117 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1121 /* Restore all name-meanings of the outer levels
1122 that were shadowed by this level. */
1124 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1125 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1127 /* If the level being exited is the top level of a function,
1128 check over all the labels, and clear out the current
1129 (function local) meanings of their names. */
1133 clear_limbo_values (block);
1135 /* If this is the top level block of a function,
1136 the vars are the function's parameters.
1137 Don't leave them in the BLOCK because they are
1138 found in the FUNCTION_DECL instead. */
1140 BLOCK_VARS (block) = 0;
1142 /* Clear out the definitions of all label names,
1143 since their scopes end here,
1144 and add them to BLOCK_VARS. */
1146 for (link = named_labels; link; link = TREE_CHAIN (link))
1148 register tree label = TREE_VALUE (link);
1150 if (DECL_INITIAL (label) == 0)
1152 error_with_decl (label, "label `%s' used but not defined");
1153 /* Avoid crashing later. */
1154 define_label (input_filename, lineno,
1157 else if (warn_unused && !TREE_USED (label))
1158 warning_with_decl (label, "label `%s' defined but not used");
1159 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1161 /* Put the labels into the "variables" of the
1162 top-level block, so debugger can see them. */
1163 TREE_CHAIN (label) = BLOCK_VARS (block);
1164 BLOCK_VARS (block) = label;
1168 /* Pop the current level, and free the structure for reuse. */
1171 register struct binding_level *level = current_binding_level;
1172 current_binding_level = current_binding_level->level_chain;
1174 level->level_chain = free_binding_level;
1175 free_binding_level = level;
1178 /* Dispose of the block that we just made inside some higher level. */
1180 DECL_INITIAL (current_function_decl) = block;
1183 if (!block_previously_created)
1184 current_binding_level->blocks
1185 = chainon (current_binding_level->blocks, block);
1187 /* If we did not make a block for the level just exited,
1188 any blocks made for inner levels
1189 (since they cannot be recorded as subblocks in that level)
1190 must be carried forward so they will later become subblocks
1191 of something else. */
1193 current_binding_level->blocks
1194 = chainon (current_binding_level->blocks, subblocks);
1196 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1197 binding contour so that they point to the appropriate construct, i.e.
1198 either to the current FUNCTION_DECL node, or else to the BLOCK node
1199 we just constructed.
1201 Note that for tagged types whose scope is just the formal parameter
1202 list for some function type specification, we can't properly set
1203 their TYPE_CONTEXTs here, because we don't have a pointer to the
1204 appropriate FUNCTION_TYPE node readily available to us. For those
1205 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1206 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1207 node which will represent the "scope" for these "parameter list local"
1212 for (link = tags; link; link = TREE_CHAIN (link))
1213 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1215 for (link = tags; link; link = TREE_CHAIN (link))
1216 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1219 TREE_USED (block) = 1;
1223 /* Delete the node BLOCK from the current binding level.
1224 This is used for the block inside a stmt expr ({...})
1225 so that the block can be reinserted where appropriate. */
1228 delete_block (block)
1232 if (current_binding_level->blocks == block)
1233 current_binding_level->blocks = TREE_CHAIN (block);
1234 for (t = current_binding_level->blocks; t;)
1236 if (TREE_CHAIN (t) == block)
1237 TREE_CHAIN (t) = TREE_CHAIN (block);
1241 TREE_CHAIN (block) = NULL;
1242 /* Clear TREE_USED which is always set by poplevel.
1243 The flag is set again if insert_block is called. */
1244 TREE_USED (block) = 0;
1247 /* Insert BLOCK at the end of the list of subblocks of the
1248 current binding level. This is used when a BIND_EXPR is expanded,
1249 to handle the BLOCK node inside the BIND_EXPR. */
1252 insert_block (block)
1255 TREE_USED (block) = 1;
1256 current_binding_level->blocks
1257 = chainon (current_binding_level->blocks, block);
1260 /* Set the BLOCK node for the innermost scope
1261 (the one we are currently in). */
1265 register tree block;
1267 current_binding_level->this_block = block;
1273 register struct binding_level *newlevel;
1275 /* Reuse or create a struct for this binding level. */
1277 if (free_binding_level)
1279 newlevel = free_binding_level;
1280 free_binding_level = free_binding_level->level_chain;
1284 newlevel = make_binding_level ();
1287 /* Add this level to the front of the chain (stack) of label levels. */
1289 newlevel->level_chain = label_level_chain;
1290 label_level_chain = newlevel;
1292 newlevel->names = named_labels;
1293 newlevel->shadowed = shadowed_labels;
1295 shadowed_labels = 0;
1301 register struct binding_level *level = label_level_chain;
1304 /* Clear out the definitions of the declared labels in this level.
1305 Leave in the list any ordinary, non-declared labels. */
1306 for (link = named_labels, prev = 0; link;)
1308 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1310 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1312 error_with_decl (TREE_VALUE (link),
1313 "label `%s' used but not defined");
1314 /* Avoid crashing later. */
1315 define_label (input_filename, lineno,
1316 DECL_NAME (TREE_VALUE (link)));
1318 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1319 warning_with_decl (TREE_VALUE (link),
1320 "label `%s' defined but not used");
1321 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1323 /* Delete this element from the list. */
1324 link = TREE_CHAIN (link);
1326 TREE_CHAIN (prev) = link;
1328 named_labels = link;
1333 link = TREE_CHAIN (link);
1337 /* Bring back all the labels that were shadowed. */
1338 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1339 if (DECL_NAME (TREE_VALUE (link)) != 0)
1340 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1341 = TREE_VALUE (link);
1343 named_labels = chainon (named_labels, level->names);
1344 shadowed_labels = level->shadowed;
1346 /* Pop the current level, and free the structure for reuse. */
1347 label_level_chain = label_level_chain->level_chain;
1348 level->level_chain = free_binding_level;
1349 free_binding_level = level;
1352 /* Push a definition or a declaration of struct, union or enum tag "name".
1353 "type" should be the type node.
1354 We assume that the tag "name" is not already defined.
1356 Note that the definition may really be just a forward reference.
1357 In that case, the TYPE_SIZE will be zero. */
1360 pushtag (name, type)
1363 register struct binding_level *b;
1365 /* Find the proper binding level for this type tag. */
1367 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1372 /* Record the identifier as the type's name if it has none. */
1374 if (TYPE_NAME (type) == 0)
1375 TYPE_NAME (type) = name;
1378 if (b == global_binding_level)
1379 b->tags = perm_tree_cons (name, type, b->tags);
1381 b->tags = saveable_tree_cons (name, type, b->tags);
1383 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1384 tagged type we just added to the current binding level. This fake
1385 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1386 to output a representation of a tagged type, and it also gives
1387 us a convenient place to record the "scope start" address for the
1390 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1392 /* An approximation for now, so we can tell this is a function-scope tag.
1393 This will be updated in poplevel. */
1394 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1397 /* Handle when a new declaration NEWDECL
1398 has the same name as an old one OLDDECL
1399 in the same binding contour.
1400 Prints an error message if appropriate.
1402 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1403 Otherwise, return 0.
1405 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1406 and OLDDECL is in an outer binding level and should thus not be changed. */
1409 duplicate_decls (newdecl, olddecl, different_binding_level)
1410 register tree newdecl, olddecl;
1411 int different_binding_level;
1413 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1414 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1415 && DECL_INITIAL (newdecl) != 0);
1416 tree oldtype = TREE_TYPE (olddecl);
1417 tree newtype = TREE_TYPE (newdecl);
1420 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1421 DECL_MACHINE_ATTRIBUTES (newdecl) = DECL_MACHINE_ATTRIBUTES (olddecl);
1423 if (TREE_CODE (newtype) == ERROR_MARK
1424 || TREE_CODE (oldtype) == ERROR_MARK)
1427 /* New decl is completely inconsistent with the old one =>
1428 tell caller to replace the old one.
1429 This is always an error except in the case of shadowing a builtin. */
1430 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1432 if (TREE_CODE (olddecl) == FUNCTION_DECL
1433 && (DECL_BUILT_IN (olddecl)
1434 || DECL_BUILT_IN_NONANSI (olddecl)))
1436 /* If you declare a built-in or predefined function name as static,
1437 the old definition is overridden,
1438 but optionally warn this was a bad choice of name. */
1439 if (!TREE_PUBLIC (newdecl))
1443 else if (DECL_BUILT_IN (olddecl))
1444 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1446 warning_with_decl (newdecl, "shadowing library function `%s'");
1448 /* Likewise, if the built-in is not ansi, then programs can
1449 override it even globally without an error. */
1450 else if (! DECL_BUILT_IN (olddecl))
1451 warning_with_decl (newdecl,
1452 "library function `%s' declared as non-function");
1454 else if (DECL_BUILT_IN_NONANSI (olddecl))
1455 warning_with_decl (newdecl,
1456 "built-in function `%s' declared as non-function");
1458 warning_with_decl (newdecl,
1459 "built-in function `%s' declared as non-function");
1463 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1464 error_with_decl (olddecl, "previous declaration of `%s'");
1470 /* For real parm decl following a forward decl,
1471 return 1 so old decl will be reused. */
1472 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1473 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1476 /* The new declaration is the same kind of object as the old one.
1477 The declarations may partially match. Print warnings if they don't
1478 match enough. Ultimately, copy most of the information from the new
1479 decl to the old one, and keep using the old one. */
1481 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1482 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1483 && DECL_INITIAL (olddecl) == 0)
1484 /* If -traditional, avoid error for redeclaring fcn
1485 after implicit decl. */
1487 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1488 && DECL_BUILT_IN (olddecl))
1490 /* A function declaration for a built-in function. */
1491 if (!TREE_PUBLIC (newdecl))
1493 /* If you declare a built-in function name as static, the
1494 built-in definition is overridden,
1495 but optionally warn this was a bad choice of name. */
1497 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1498 /* Discard the old built-in function. */
1501 else if (!types_match)
1503 /* Accept the return type of the new declaration if same modes. */
1504 tree oldreturntype = TREE_TYPE (oldtype);
1505 tree newreturntype = TREE_TYPE (newtype);
1507 /* Make sure we put the new type in the same obstack as the old ones.
1508 If the old types are not both in the same obstack, use the
1510 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1511 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1514 push_obstacks_nochange ();
1515 end_temporary_allocation ();
1518 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1520 /* Function types may be shared, so we can't just modify
1521 the return type of olddecl's function type. */
1523 = build_function_type (newreturntype,
1524 TYPE_ARG_TYPES (oldtype));
1526 types_match = comptypes (newtype, trytype);
1530 /* Accept harmless mismatch in first argument type also.
1532 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1533 && TYPE_ARG_TYPES (oldtype) != 0
1534 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1535 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1536 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1537 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1539 /* Function types may be shared, so we can't just modify
1540 the return type of olddecl's function type. */
1542 = build_function_type (TREE_TYPE (oldtype),
1543 tree_cons (NULL_TREE,
1544 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1545 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1547 types_match = comptypes (newtype, trytype);
1551 if (! different_binding_level)
1552 TREE_TYPE (olddecl) = oldtype;
1558 /* If types don't match for a built-in, throw away the built-in. */
1559 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1563 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1564 && DECL_SOURCE_LINE (olddecl) == 0)
1566 /* A function declaration for a predeclared function
1567 that isn't actually built in. */
1568 if (!TREE_PUBLIC (newdecl))
1570 /* If you declare it as static, the
1571 default definition is overridden. */
1574 else if (!types_match)
1576 /* If the types don't match, preserve volatility indication.
1577 Later on, we will discard everything else about the
1578 default declaration. */
1579 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1582 /* Permit char *foo () to match void *foo (...) if not pedantic,
1583 if one of them came from a system header file. */
1584 else if (!types_match
1585 && TREE_CODE (olddecl) == FUNCTION_DECL
1586 && TREE_CODE (newdecl) == FUNCTION_DECL
1587 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1588 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1589 && (DECL_IN_SYSTEM_HEADER (olddecl)
1590 || DECL_IN_SYSTEM_HEADER (newdecl))
1591 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1592 && TYPE_ARG_TYPES (oldtype) == 0
1593 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1594 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1596 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1597 && TYPE_ARG_TYPES (newtype) == 0
1598 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1599 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1602 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1603 /* Make sure we keep void * as ret type, not char *. */
1604 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1605 TREE_TYPE (newdecl) = newtype = oldtype;
1607 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1608 we will come back here again. */
1609 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1611 else if (!types_match
1612 /* Permit char *foo (int, ...); followed by char *foo ();
1614 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1616 /* Return types must still match. */
1617 && comptypes (TREE_TYPE (oldtype),
1618 TREE_TYPE (newtype))
1619 && TYPE_ARG_TYPES (newtype) == 0))
1621 error_with_decl (newdecl, "conflicting types for `%s'");
1622 /* Check for function type mismatch
1623 involving an empty arglist vs a nonempty one. */
1624 if (TREE_CODE (olddecl) == FUNCTION_DECL
1625 && comptypes (TREE_TYPE (oldtype),
1626 TREE_TYPE (newtype))
1627 && ((TYPE_ARG_TYPES (oldtype) == 0
1628 && DECL_INITIAL (olddecl) == 0)
1630 (TYPE_ARG_TYPES (newtype) == 0
1631 && DECL_INITIAL (newdecl) == 0)))
1633 /* Classify the problem further. */
1634 register tree t = TYPE_ARG_TYPES (oldtype);
1636 t = TYPE_ARG_TYPES (newtype);
1637 for (; t; t = TREE_CHAIN (t))
1639 register tree type = TREE_VALUE (t);
1641 if (TREE_CHAIN (t) == 0
1642 && TYPE_MAIN_VARIANT (type) != void_type_node)
1644 error ("A parameter list with an ellipsis can't match");
1645 error ("an empty parameter name list declaration.");
1649 if (TYPE_MAIN_VARIANT (type) == float_type_node
1650 || C_PROMOTING_INTEGER_TYPE_P (type))
1652 error ("An argument type that has a default promotion");
1653 error ("can't match an empty parameter name list declaration.");
1658 error_with_decl (olddecl, "previous declaration of `%s'");
1662 errmsg = redeclaration_error_message (newdecl, olddecl);
1665 error_with_decl (newdecl, errmsg);
1666 error_with_decl (olddecl,
1667 ((DECL_INITIAL (olddecl)
1668 && current_binding_level == global_binding_level)
1669 ? "`%s' previously defined here"
1670 : "`%s' previously declared here"));
1672 else if (TREE_CODE (newdecl) == TYPE_DECL
1673 && (DECL_IN_SYSTEM_HEADER (olddecl)
1674 || DECL_IN_SYSTEM_HEADER (newdecl)))
1676 warning_with_decl (newdecl, "redefinition of `%s'");
1679 ((DECL_INITIAL (olddecl)
1680 && current_binding_level == global_binding_level)
1681 ? "`%s' previously defined here"
1682 : "`%s' previously declared here"));
1684 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1685 && DECL_INITIAL (olddecl) != 0
1686 && TYPE_ARG_TYPES (oldtype) == 0
1687 && TYPE_ARG_TYPES (newtype) != 0
1688 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1690 register tree type, parm;
1692 /* Prototype decl follows defn w/o prototype. */
1694 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1695 type = TYPE_ARG_TYPES (newtype),
1697 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1698 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1699 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1701 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1702 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1704 errmsg = "prototype for `%s' follows and number of arguments";
1707 /* Type for passing arg must be consistent
1708 with that declared for the arg. */
1709 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1710 /* If -traditional, allow `unsigned int' instead of `int'
1711 in the prototype. */
1712 && (! (flag_traditional
1713 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1714 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1716 errmsg = "prototype for `%s' follows and argument %d";
1722 error_with_decl (newdecl, errmsg, nargs);
1723 error_with_decl (olddecl,
1724 "doesn't match non-prototype definition here");
1728 warning_with_decl (newdecl, "prototype for `%s' follows");
1729 warning_with_decl (olddecl, "non-prototype definition here");
1732 /* Warn about mismatches in various flags. */
1735 /* Warn if function is now inline
1736 but was previously declared not inline and has been called. */
1737 if (TREE_CODE (olddecl) == FUNCTION_DECL
1738 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1739 && TREE_USED (olddecl))
1740 warning_with_decl (newdecl,
1741 "`%s' declared inline after being called");
1742 if (TREE_CODE (olddecl) == FUNCTION_DECL
1743 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1744 && DECL_INITIAL (olddecl) != 0)
1745 warning_with_decl (newdecl,
1746 "`%s' declared inline after its definition");
1748 /* If pedantic, warn when static declaration follows a non-static
1749 declaration. Otherwise, do so only for functions. */
1750 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1751 && TREE_PUBLIC (olddecl)
1752 && !TREE_PUBLIC (newdecl))
1753 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1755 /* Warn when const declaration follows a non-const
1756 declaration, but not for functions. */
1757 if (TREE_CODE (olddecl) != FUNCTION_DECL
1758 && !TREE_READONLY (olddecl)
1759 && TREE_READONLY (newdecl))
1760 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1761 /* These bits are logically part of the type, for variables.
1762 But not for functions
1763 (where qualifiers are not valid ANSI anyway). */
1764 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1765 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1766 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1767 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1771 /* Optionally warn about more than one declaration for the same name. */
1772 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1773 /* Don't warn about a function declaration
1774 followed by a definition. */
1775 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1776 && DECL_INITIAL (olddecl) == 0)
1777 /* Don't warn about extern decl followed by (tentative) definition. */
1778 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1780 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1781 warning_with_decl (olddecl, "previous declaration of `%s'");
1784 /* Copy all the DECL_... slots specified in the new decl
1785 except for any that we copy here from the old type.
1787 Past this point, we don't change OLDTYPE and NEWTYPE
1788 even if we change the types of NEWDECL and OLDDECL. */
1792 /* When copying info to olddecl, we store into write_olddecl
1793 instead. This allows us to avoid modifying olddecl when
1794 different_binding_level is true. */
1795 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1797 /* Make sure we put the new type in the same obstack as the old ones.
1798 If the old types are not both in the same obstack, use the permanent
1800 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1801 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1804 push_obstacks_nochange ();
1805 end_temporary_allocation ();
1808 /* Merge the data types specified in the two decls. */
1809 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1811 if (different_binding_level)
1813 = build_type_attribute_variant
1815 merge_attributes (TYPE_ATTRIBUTES (newtype),
1816 TYPE_ATTRIBUTES (oldtype)));
1819 = TREE_TYPE (olddecl)
1820 = common_type (newtype, oldtype);
1823 /* Lay the type out, unless already done. */
1824 if (oldtype != TREE_TYPE (newdecl))
1826 if (TREE_TYPE (newdecl) != error_mark_node)
1827 layout_type (TREE_TYPE (newdecl));
1828 if (TREE_CODE (newdecl) != FUNCTION_DECL
1829 && TREE_CODE (newdecl) != TYPE_DECL
1830 && TREE_CODE (newdecl) != CONST_DECL)
1831 layout_decl (newdecl, 0);
1835 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1836 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1837 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1838 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1839 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1842 /* Keep the old rtl since we can safely use it. */
1843 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1845 /* Merge the type qualifiers. */
1846 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1847 && !TREE_THIS_VOLATILE (newdecl))
1848 TREE_THIS_VOLATILE (write_olddecl) = 0;
1849 if (TREE_READONLY (newdecl))
1850 TREE_READONLY (write_olddecl) = 1;
1851 if (TREE_THIS_VOLATILE (newdecl))
1853 TREE_THIS_VOLATILE (write_olddecl) = 1;
1854 if (TREE_CODE (newdecl) == VAR_DECL)
1855 make_var_volatile (newdecl);
1858 /* Keep source location of definition rather than declaration. */
1859 /* When called with different_binding_level set, keep the old
1860 information so that meaningful diagnostics can be given. */
1861 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1862 && ! different_binding_level)
1864 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1865 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1868 /* Merge the unused-warning information. */
1869 if (DECL_IN_SYSTEM_HEADER (olddecl))
1870 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1871 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1872 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1874 /* Merge the initialization information. */
1875 /* When called with different_binding_level set, don't copy over
1876 DECL_INITIAL, so that we don't accidentally change function
1877 declarations into function definitions. */
1878 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1879 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1881 /* Merge the section attribute.
1882 We want to issue an error if the sections conflict but that must be
1883 done later in decl_attributes since we are called before attributes
1885 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1886 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1888 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1890 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1891 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1896 /* If cannot merge, then use the new type and qualifiers,
1897 and don't preserve the old rtl. */
1898 else if (! different_binding_level)
1900 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1901 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1902 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1903 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1906 /* Merge the storage class information. */
1907 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1908 /* For functions, static overrides non-static. */
1909 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1911 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1912 /* This is since we don't automatically
1913 copy the attributes of NEWDECL into OLDDECL. */
1914 /* No need to worry about different_binding_level here because
1915 then TREE_PUBLIC (newdecl) was true. */
1916 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1917 /* If this clears `static', clear it in the identifier too. */
1918 if (! TREE_PUBLIC (olddecl))
1919 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1921 if (DECL_EXTERNAL (newdecl))
1923 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1924 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1925 /* An extern decl does not override previous storage class. */
1926 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1927 if (! DECL_EXTERNAL (newdecl))
1928 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1932 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1933 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1936 /* If either decl says `inline', this fn is inline,
1937 unless its definition was passed already. */
1938 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1939 DECL_INLINE (olddecl) = 1;
1940 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1942 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1944 if (DECL_BUILT_IN (olddecl))
1946 /* Get rid of any built-in function if new arg types don't match it
1947 or if we have a function definition. */
1948 if (! types_match || new_is_definition)
1950 if (! different_binding_level)
1952 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1953 DECL_BUILT_IN (olddecl) = 0;
1958 /* If redeclaring a builtin function, and not a definition,
1959 it stays built in. */
1960 DECL_BUILT_IN (newdecl) = 1;
1961 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1964 /* Also preserve various other info from the definition. */
1965 else if (! new_is_definition)
1966 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1967 if (! new_is_definition)
1969 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1970 /* When called with different_binding_level set, don't copy over
1971 DECL_INITIAL, so that we don't accidentally change function
1972 declarations into function definitions. */
1973 if (! different_binding_level)
1974 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1975 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1976 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1977 if (DECL_INLINE (newdecl))
1978 DECL_ABSTRACT_ORIGIN (newdecl) = olddecl;
1981 if (different_binding_level)
1983 /* Don't output a duplicate symbol for this declaration. */
1984 TREE_ASM_WRITTEN (newdecl) = 1;
1988 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1989 But preserve OLDdECL's DECL_UID. */
1991 register unsigned olddecl_uid = DECL_UID (olddecl);
1993 bcopy ((char *) newdecl + sizeof (struct tree_common),
1994 (char *) olddecl + sizeof (struct tree_common),
1995 sizeof (struct tree_decl) - sizeof (struct tree_common));
1996 DECL_UID (olddecl) = olddecl_uid;
2002 /* Record a decl-node X as belonging to the current lexical scope.
2003 Check for errors (such as an incompatible declaration for the same
2004 name already seen in the same scope).
2006 Returns either X or an old decl for the same name.
2007 If an old decl is returned, it may have been smashed
2008 to agree with what X says. */
2015 register tree name = DECL_NAME (x);
2016 register struct binding_level *b = current_binding_level;
2018 DECL_CONTEXT (x) = current_function_decl;
2019 /* A local extern declaration for a function doesn't constitute nesting.
2020 A local auto declaration does, since it's a forward decl
2021 for a nested function coming later. */
2022 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2023 && DECL_EXTERNAL (x))
2024 DECL_CONTEXT (x) = 0;
2026 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2027 && x != IDENTIFIER_IMPLICIT_DECL (name)
2028 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2029 && !DECL_IN_SYSTEM_HEADER (x))
2030 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2036 int different_binding_level = 0;
2038 t = lookup_name_current_level (name);
2039 /* Don't type check externs here when -traditional. This is so that
2040 code with conflicting declarations inside blocks will get warnings
2041 not errors. X11 for instance depends on this. */
2042 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2044 t = IDENTIFIER_GLOBAL_VALUE (name);
2045 /* Type decls at global scope don't conflict with externs declared
2046 inside lexical blocks. */
2047 if (t && TREE_CODE (t) == TYPE_DECL)
2049 different_binding_level = 1;
2051 if (t != 0 && t == error_mark_node)
2052 /* error_mark_node is 0 for a while during initialization! */
2055 error_with_decl (x, "`%s' used prior to declaration");
2060 file = DECL_SOURCE_FILE (t);
2061 line = DECL_SOURCE_LINE (t);
2064 /* If this decl is `static' and an implicit decl was seen previously,
2065 warn. But don't complain if -traditional,
2066 since traditional compilers don't complain. */
2067 if (! flag_traditional && TREE_PUBLIC (name)
2068 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2069 sets this for all functions. */
2070 && ! TREE_PUBLIC (x)
2071 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2072 /* We used to warn also for explicit extern followed by static,
2073 but sometimes you need to do it that way. */
2074 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2076 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2077 IDENTIFIER_POINTER (name));
2078 pedwarn_with_file_and_line
2079 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2080 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2081 "previous declaration of `%s'",
2082 IDENTIFIER_POINTER (name));
2085 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2087 if (TREE_CODE (t) == PARM_DECL)
2089 /* Don't allow more than one "real" duplicate
2090 of a forward parm decl. */
2091 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2097 /* If we are processing a typedef statement, generate a whole new
2098 ..._TYPE node (which will be just an variant of the existing
2099 ..._TYPE node with identical properties) and then install the
2100 TYPE_DECL node generated to represent the typedef name as the
2101 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2103 The whole point here is to end up with a situation where each
2104 and every ..._TYPE node the compiler creates will be uniquely
2105 associated with AT MOST one node representing a typedef name.
2106 This way, even though the compiler substitutes corresponding
2107 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2108 early on, later parts of the compiler can always do the reverse
2109 translation and get back the corresponding typedef name. For
2112 typedef struct S MY_TYPE;
2115 Later parts of the compiler might only know that `object' was of
2116 type `struct S' if if were not for code just below. With this
2117 code however, later parts of the compiler see something like:
2119 struct S' == struct S
2120 typedef struct S' MY_TYPE;
2123 And they can then deduce (from the node for type struct S') that
2124 the original object declaration was:
2128 Being able to do this is important for proper support of protoize,
2129 and also for generating precise symbolic debugging information
2130 which takes full account of the programmer's (typedef) vocabulary.
2132 Obviously, we don't want to generate a duplicate ..._TYPE node if
2133 the TYPE_DECL node that we are now processing really represents a
2134 standard built-in type.
2136 Since all standard types are effectively declared at line zero
2137 in the source file, we can easily check to see if we are working
2138 on a standard type by checking the current value of lineno. */
2140 if (TREE_CODE (x) == TYPE_DECL)
2142 if (DECL_SOURCE_LINE (x) == 0)
2144 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2145 TYPE_NAME (TREE_TYPE (x)) = x;
2147 else if (TREE_TYPE (x) != error_mark_node)
2149 tree tt = TREE_TYPE (x);
2150 DECL_ORIGINAL_TYPE (x) = tt;
2151 tt = build_type_copy (tt);
2157 /* Multiple external decls of the same identifier ought to match.
2158 Check against both global declarations (when traditional) and out of
2159 scope (limbo) block level declarations.
2161 We get warnings about inline functions where they are defined.
2162 Avoid duplicate warnings where they are used. */
2163 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2167 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2168 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2169 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2170 decl = IDENTIFIER_GLOBAL_VALUE (name);
2171 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2172 /* Decls in limbo are always extern, so no need to check that. */
2173 decl = IDENTIFIER_LIMBO_VALUE (name);
2177 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2178 /* If old decl is built-in, we already warned if we should. */
2179 && !DECL_BUILT_IN (decl))
2181 pedwarn_with_decl (x,
2182 "type mismatch with previous external decl");
2183 pedwarn_with_decl (decl, "previous external decl of `%s'");
2187 /* If a function has had an implicit declaration, and then is defined,
2188 make sure they are compatible. */
2190 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2191 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2192 && TREE_CODE (x) == FUNCTION_DECL
2193 && ! comptypes (TREE_TYPE (x),
2194 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2196 warning_with_decl (x, "type mismatch with previous implicit declaration");
2197 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2198 "previous implicit declaration of `%s'");
2201 /* In PCC-compatibility mode, extern decls of vars with no current decl
2202 take effect at top level no matter where they are. */
2203 if (flag_traditional && DECL_EXTERNAL (x)
2204 && lookup_name (name) == 0)
2206 tree type = TREE_TYPE (x);
2208 /* But don't do this if the type contains temporary nodes. */
2211 if (type == error_mark_node)
2213 if (! TREE_PERMANENT (type))
2215 warning_with_decl (x, "type of external `%s' is not global");
2216 /* By exiting the loop early, we leave TYPE nonzero,
2217 and thus prevent globalization of the decl. */
2220 else if (TREE_CODE (type) == FUNCTION_TYPE
2221 && TYPE_ARG_TYPES (type) != 0)
2222 /* The types might not be truly local,
2223 but the list of arg types certainly is temporary.
2224 Since prototypes are nontraditional,
2225 ok not to do the traditional thing. */
2227 type = TREE_TYPE (type);
2231 b = global_binding_level;
2234 /* This name is new in its binding level.
2235 Install the new declaration and return it. */
2236 if (b == global_binding_level)
2238 /* Install a global value. */
2240 /* If the first global decl has external linkage,
2241 warn if we later see static one. */
2242 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2243 TREE_PUBLIC (name) = 1;
2245 IDENTIFIER_GLOBAL_VALUE (name) = x;
2247 /* We no longer care about any previous block level declarations. */
2248 IDENTIFIER_LIMBO_VALUE (name) = 0;
2250 /* Don't forget if the function was used via an implicit decl. */
2251 if (IDENTIFIER_IMPLICIT_DECL (name)
2252 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2253 TREE_USED (x) = 1, TREE_USED (name) = 1;
2255 /* Don't forget if its address was taken in that way. */
2256 if (IDENTIFIER_IMPLICIT_DECL (name)
2257 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2258 TREE_ADDRESSABLE (x) = 1;
2260 /* Warn about mismatches against previous implicit decl. */
2261 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2262 /* If this real decl matches the implicit, don't complain. */
2263 && ! (TREE_CODE (x) == FUNCTION_DECL
2264 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2265 == integer_type_node)))
2266 pedwarn ("`%s' was previously implicitly declared to return `int'",
2267 IDENTIFIER_POINTER (name));
2269 /* If this decl is `static' and an `extern' was seen previously,
2270 that is erroneous. */
2271 if (TREE_PUBLIC (name)
2272 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2274 /* Okay to redeclare an ANSI built-in as static. */
2275 if (t != 0 && DECL_BUILT_IN (t))
2277 /* Okay to declare a non-ANSI built-in as anything. */
2278 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2280 /* Okay to have global type decl after an earlier extern
2281 declaration inside a lexical block. */
2282 else if (TREE_CODE (x) == TYPE_DECL)
2284 else if (IDENTIFIER_IMPLICIT_DECL (name))
2285 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2286 IDENTIFIER_POINTER (name));
2288 pedwarn ("`%s' was declared `extern' and later `static'",
2289 IDENTIFIER_POINTER (name));
2294 /* Here to install a non-global value. */
2295 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2296 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2297 IDENTIFIER_LOCAL_VALUE (name) = x;
2299 /* If this is an extern function declaration, see if we
2300 have a global definition or declaration for the function. */
2302 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2304 && TREE_CODE (x) == FUNCTION_DECL
2305 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2307 /* We have one. Their types must agree. */
2308 if (! comptypes (TREE_TYPE (x),
2309 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2310 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2313 /* Inner extern decl is inline if global one is.
2314 Copy enough to really inline it. */
2315 if (DECL_INLINE (oldglobal))
2317 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2318 DECL_INITIAL (x) = (current_function_decl == oldglobal
2319 ? 0 : DECL_INITIAL (oldglobal));
2320 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2321 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2322 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2323 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2324 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2325 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2327 /* Inner extern decl is built-in if global one is. */
2328 if (DECL_BUILT_IN (oldglobal))
2330 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2331 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2333 /* Keep the arg types from a file-scope fcn defn. */
2334 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2335 && DECL_INITIAL (oldglobal)
2336 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2337 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2341 #if 0 /* This case is probably sometimes the right thing to do. */
2342 /* If we have a local external declaration,
2343 then any file-scope declaration should not
2344 have been static. */
2345 if (oldlocal == 0 && oldglobal != 0
2346 && !TREE_PUBLIC (oldglobal)
2347 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2348 warning ("`%s' locally external but globally static",
2349 IDENTIFIER_POINTER (name));
2352 /* If we have a local external declaration,
2353 and no file-scope declaration has yet been seen,
2354 then if we later have a file-scope decl it must not be static. */
2356 && DECL_EXTERNAL (x)
2360 TREE_PUBLIC (name) = 1;
2362 /* Save this decl, so that we can do type checking against
2363 other decls after it falls out of scope.
2365 Only save it once. This prevents temporary decls created in
2366 expand_inline_function from being used here, since this
2367 will have been set when the inline function was parsed.
2368 It also helps give slightly better warnings. */
2369 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2370 IDENTIFIER_LIMBO_VALUE (name) = x;
2373 /* Warn if shadowing an argument at the top level of the body. */
2374 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2375 /* This warning doesn't apply to the parms of a nested fcn. */
2376 && ! current_binding_level->parm_flag
2377 /* Check that this is one level down from the parms. */
2378 && current_binding_level->level_chain->parm_flag
2379 /* Check that the decl being shadowed
2380 comes from the parm level, one level up. */
2381 && chain_member (oldlocal, current_binding_level->level_chain->names))
2383 if (TREE_CODE (oldlocal) == PARM_DECL)
2384 pedwarn ("declaration of `%s' shadows a parameter",
2385 IDENTIFIER_POINTER (name));
2387 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2388 IDENTIFIER_POINTER (name));
2391 /* Maybe warn if shadowing something else. */
2392 else if (warn_shadow && !DECL_EXTERNAL (x)
2393 /* No shadow warnings for internally generated vars. */
2394 && DECL_SOURCE_LINE (x) != 0
2395 /* No shadow warnings for vars made for inlining. */
2396 && ! DECL_FROM_INLINE (x))
2398 char *warnstring = 0;
2400 if (TREE_CODE (x) == PARM_DECL
2401 && current_binding_level->level_chain->parm_flag)
2402 /* Don't warn about the parm names in function declarator
2403 within a function declarator.
2404 It would be nice to avoid warning in any function
2405 declarator in a declaration, as opposed to a definition,
2406 but there is no way to tell it's not a definition. */
2408 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2409 warnstring = "declaration of `%s' shadows a parameter";
2410 else if (oldlocal != 0)
2411 warnstring = "declaration of `%s' shadows previous local";
2412 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2413 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2414 warnstring = "declaration of `%s' shadows global declaration";
2417 warning (warnstring, IDENTIFIER_POINTER (name));
2420 /* If storing a local value, there may already be one (inherited).
2421 If so, record it for restoration when this binding level ends. */
2423 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2426 /* Keep count of variables in this level with incomplete type. */
2427 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2431 /* Put decls on list in reverse order.
2432 We will reverse them later if necessary. */
2433 TREE_CHAIN (x) = b->names;
2439 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2442 pushdecl_top_level (x)
2446 register struct binding_level *b = current_binding_level;
2448 current_binding_level = global_binding_level;
2450 current_binding_level = b;
2454 /* Generate an implicit declaration for identifier FUNCTIONID
2455 as a function of type int (). Print a warning if appropriate. */
2458 implicitly_declare (functionid)
2462 int traditional_warning = 0;
2463 /* Only one "implicit declaration" warning per identifier. */
2464 int implicit_warning;
2466 /* Save the decl permanently so we can warn if definition follows. */
2467 push_obstacks_nochange ();
2468 end_temporary_allocation ();
2470 /* We used to reuse an old implicit decl here,
2471 but this loses with inline functions because it can clobber
2472 the saved decl chains. */
2473 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2474 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2476 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2478 /* Warn of implicit decl following explicit local extern decl.
2479 This is probably a program designed for traditional C. */
2480 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2481 traditional_warning = 1;
2483 /* Warn once of an implicit declaration. */
2484 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2486 DECL_EXTERNAL (decl) = 1;
2487 TREE_PUBLIC (decl) = 1;
2489 /* Record that we have an implicit decl and this is it. */
2490 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2492 /* ANSI standard says implicit declarations are in the innermost block.
2493 So we record the decl in the standard fashion.
2494 If flag_traditional is set, pushdecl does it top-level. */
2497 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2498 maybe_objc_check_decl (decl);
2500 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2502 if (mesg_implicit_function_declaration && implicit_warning)
2504 if (mesg_implicit_function_declaration == 2)
2505 error ("implicit declaration of function `%s'",
2506 IDENTIFIER_POINTER (functionid));
2508 warning ("implicit declaration of function `%s'",
2509 IDENTIFIER_POINTER (functionid));
2511 else if (warn_traditional && traditional_warning)
2512 warning ("function `%s' was previously declared within a block",
2513 IDENTIFIER_POINTER (functionid));
2515 /* Write a record describing this implicit function declaration to the
2516 prototypes file (if requested). */
2518 gen_aux_info_record (decl, 0, 1, 0);
2525 /* Return zero if the declaration NEWDECL is valid
2526 when the declaration OLDDECL (assumed to be for the same name)
2527 has already been seen.
2528 Otherwise return an error message format string with a %s
2529 where the identifier should go. */
2532 redeclaration_error_message (newdecl, olddecl)
2533 tree newdecl, olddecl;
2535 if (TREE_CODE (newdecl) == TYPE_DECL)
2537 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2539 /* pushdecl creates distinct types for TYPE_DECLs by calling
2540 build_type_copy, so the above comparison generally fails. We do
2541 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2542 is equivalent to what this code used to do before the build_type_copy
2543 call. The variant type distinction should not matter for traditional
2544 code, because it doesn't have type qualifiers. */
2545 if (flag_traditional
2546 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2548 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2550 return "redefinition of `%s'";
2552 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2554 /* Declarations of functions can insist on internal linkage
2555 but they can't be inconsistent with internal linkage,
2556 so there can be no error on that account.
2557 However defining the same name twice is no good. */
2558 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2559 /* However, defining once as extern inline and a second
2560 time in another way is ok. */
2561 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2562 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2563 return "redefinition of `%s'";
2566 else if (current_binding_level == global_binding_level)
2568 /* Objects declared at top level: */
2569 /* If at least one is a reference, it's ok. */
2570 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2572 /* Reject two definitions. */
2573 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2574 return "redefinition of `%s'";
2575 /* Now we have two tentative defs, or one tentative and one real def. */
2576 /* Insist that the linkage match. */
2577 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2578 return "conflicting declarations of `%s'";
2581 else if (current_binding_level->parm_flag
2582 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2586 /* Newdecl has block scope. If olddecl has block scope also, then
2587 reject two definitions, and reject a definition together with an
2588 external reference. Otherwise, it is OK, because newdecl must
2589 be an extern reference to olddecl. */
2590 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2591 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2592 return "redeclaration of `%s'";
2597 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2598 Create one if none exists so far for the current function.
2599 This function is called for both label definitions and label references. */
2605 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2607 if (current_function_decl == 0)
2609 error ("label %s referenced outside of any function",
2610 IDENTIFIER_POINTER (id));
2614 /* Use a label already defined or ref'd with this name. */
2617 /* But not if it is inherited and wasn't declared to be inheritable. */
2618 if (DECL_CONTEXT (decl) != current_function_decl
2619 && ! C_DECLARED_LABEL_FLAG (decl))
2620 return shadow_label (id);
2624 decl = build_decl (LABEL_DECL, id, void_type_node);
2626 /* Make sure every label has an rtx. */
2629 /* A label not explicitly declared must be local to where it's ref'd. */
2630 DECL_CONTEXT (decl) = current_function_decl;
2632 DECL_MODE (decl) = VOIDmode;
2634 /* Say where one reference is to the label,
2635 for the sake of the error if it is not defined. */
2636 DECL_SOURCE_LINE (decl) = lineno;
2637 DECL_SOURCE_FILE (decl) = input_filename;
2639 IDENTIFIER_LABEL_VALUE (id) = decl;
2641 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2646 /* Make a label named NAME in the current function,
2647 shadowing silently any that may be inherited from containing functions
2648 or containing scopes.
2650 Note that valid use, if the label being shadowed
2651 comes from another scope in the same function,
2652 requires calling declare_nonlocal_label right away. */
2658 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2664 /* Check to make sure that the label hasn't already been declared
2665 at this label scope */
2666 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2667 if (TREE_VALUE (dup) == decl)
2669 error ("duplicate label declaration `%s'",
2670 IDENTIFIER_POINTER (name));
2671 error_with_decl (TREE_VALUE (dup),
2672 "this is a previous declaration");
2673 /* Just use the previous declaration. */
2674 return lookup_label (name);
2677 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2678 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2681 return lookup_label (name);
2684 /* Define a label, specifying the location in the source file.
2685 Return the LABEL_DECL node for the label, if the definition is valid.
2686 Otherwise return 0. */
2689 define_label (filename, line, name)
2694 tree decl = lookup_label (name);
2696 /* If label with this name is known from an outer context, shadow it. */
2697 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2699 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2700 IDENTIFIER_LABEL_VALUE (name) = 0;
2701 decl = lookup_label (name);
2704 if (DECL_INITIAL (decl) != 0)
2706 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2711 /* Mark label as having been defined. */
2712 DECL_INITIAL (decl) = error_mark_node;
2713 /* Say where in the source. */
2714 DECL_SOURCE_FILE (decl) = filename;
2715 DECL_SOURCE_LINE (decl) = line;
2720 /* Return the list of declarations of the current level.
2721 Note that this list is in reverse order unless/until
2722 you nreverse it; and when you do nreverse it, you must
2723 store the result back using `storedecls' or you will lose. */
2728 return current_binding_level->names;
2731 /* Return the list of type-tags (for structs, etc) of the current level. */
2736 return current_binding_level->tags;
2739 /* Store the list of declarations of the current level.
2740 This is done for the parameter declarations of a function being defined,
2741 after they are modified in the light of any missing parameters. */
2747 current_binding_level->names = decls;
2750 /* Similarly, store the list of tags of the current level. */
2756 current_binding_level->tags = tags;
2759 /* Given NAME, an IDENTIFIER_NODE,
2760 return the structure (or union or enum) definition for that name.
2761 Searches binding levels from BINDING_LEVEL up to the global level.
2762 If THISLEVEL_ONLY is nonzero, searches only the specified context
2763 (but skips any tag-transparent contexts to find one that is
2764 meaningful for tags).
2765 CODE says which kind of type the caller wants;
2766 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2767 If the wrong kind of type is found, an error is reported. */
2770 lookup_tag (code, name, binding_level, thislevel_only)
2771 enum tree_code code;
2772 struct binding_level *binding_level;
2776 register struct binding_level *level;
2778 for (level = binding_level; level; level = level->level_chain)
2781 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2783 if (TREE_PURPOSE (tail) == name)
2785 if (TREE_CODE (TREE_VALUE (tail)) != code)
2787 /* Definition isn't the kind we were looking for. */
2788 pending_invalid_xref = name;
2789 pending_invalid_xref_file = input_filename;
2790 pending_invalid_xref_line = lineno;
2792 return TREE_VALUE (tail);
2795 if (thislevel_only && ! level->tag_transparent)
2801 /* Print an error message now
2802 for a recent invalid struct, union or enum cross reference.
2803 We don't print them immediately because they are not invalid
2804 when used in the `struct foo;' construct for shadowing. */
2807 pending_xref_error ()
2809 if (pending_invalid_xref != 0)
2810 error_with_file_and_line (pending_invalid_xref_file,
2811 pending_invalid_xref_line,
2812 "`%s' defined as wrong kind of tag",
2813 IDENTIFIER_POINTER (pending_invalid_xref));
2814 pending_invalid_xref = 0;
2817 /* Given a type, find the tag that was defined for it and return the tag name.
2818 Otherwise return 0. */
2821 lookup_tag_reverse (type)
2824 register struct binding_level *level;
2826 for (level = current_binding_level; level; level = level->level_chain)
2829 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2831 if (TREE_VALUE (tail) == type)
2832 return TREE_PURPOSE (tail);
2838 /* Look up NAME in the current binding level and its superiors
2839 in the namespace of variables, functions and typedefs.
2840 Return a ..._DECL node of some kind representing its definition,
2841 or return 0 if it is undefined. */
2848 if (current_binding_level != global_binding_level
2849 && IDENTIFIER_LOCAL_VALUE (name))
2850 val = IDENTIFIER_LOCAL_VALUE (name);
2852 val = IDENTIFIER_GLOBAL_VALUE (name);
2856 /* Similar to `lookup_name' but look only at current binding level. */
2859 lookup_name_current_level (name)
2864 if (current_binding_level == global_binding_level)
2865 return IDENTIFIER_GLOBAL_VALUE (name);
2867 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2870 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2871 if (DECL_NAME (t) == name)
2877 /* Create the predefined scalar types of C,
2878 and some nodes representing standard constants (0, 1, (void *) 0).
2879 Initialize the global binding level.
2880 Make definitions for built-in primitive functions. */
2883 init_decl_processing ()
2885 register tree endlink;
2886 /* Either char* or void*. */
2887 tree traditional_ptr_type_node;
2888 /* Data types of memcpy and strlen. */
2889 tree memcpy_ftype, memset_ftype, strlen_ftype;
2890 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2891 int wchar_type_size;
2893 tree array_domain_type;
2895 current_function_decl = NULL;
2896 named_labels = NULL;
2897 current_binding_level = NULL_BINDING_LEVEL;
2898 free_binding_level = NULL_BINDING_LEVEL;
2899 pushlevel (0); /* make the binding_level structure for global names */
2900 global_binding_level = current_binding_level;
2902 /* Define `int' and `char' first so that dbx will output them first. */
2904 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2905 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2906 integer_type_node));
2908 /* Define `char', which is like either `signed char' or `unsigned char'
2909 but not the same as either. */
2913 ? make_signed_type (CHAR_TYPE_SIZE)
2914 : make_unsigned_type (CHAR_TYPE_SIZE));
2915 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2918 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2919 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2920 long_integer_type_node));
2922 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2923 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2924 unsigned_type_node));
2926 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2927 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2928 long_unsigned_type_node));
2930 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2931 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2932 long_long_integer_type_node));
2934 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2935 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2936 long_long_unsigned_type_node));
2938 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2939 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2940 short_integer_type_node));
2942 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2943 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2944 short_unsigned_type_node));
2946 /* `unsigned long' is the standard type for sizeof.
2947 Traditionally, use a signed type.
2948 Note that stddef.h uses `unsigned long',
2949 and this must agree, even of long and int are the same size. */
2951 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2952 if (flag_traditional && TREE_UNSIGNED (sizetype))
2953 sizetype = signed_type (sizetype);
2956 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2958 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2959 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2960 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2961 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2962 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2963 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2964 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2965 TREE_TYPE (TYPE_SIZE (short_integer_type_node)) = sizetype;
2966 TREE_TYPE (TYPE_SIZE (short_unsigned_type_node)) = sizetype;
2968 error_mark_node = make_node (ERROR_MARK);
2969 TREE_TYPE (error_mark_node) = error_mark_node;
2971 /* Define both `signed char' and `unsigned char'. */
2972 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2973 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2974 signed_char_type_node));
2976 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2977 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2978 unsigned_char_type_node));
2980 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2981 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2983 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2984 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2986 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2987 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2989 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2990 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2992 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2993 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2995 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2996 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2998 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2999 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3001 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3002 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3004 float_type_node = make_node (REAL_TYPE);
3005 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3006 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3008 layout_type (float_type_node);
3010 double_type_node = make_node (REAL_TYPE);
3011 if (flag_short_double)
3012 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3014 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3015 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3017 layout_type (double_type_node);
3019 long_double_type_node = make_node (REAL_TYPE);
3020 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3021 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3022 long_double_type_node));
3023 layout_type (long_double_type_node);
3025 complex_integer_type_node = make_node (COMPLEX_TYPE);
3026 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3027 complex_integer_type_node));
3028 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3029 layout_type (complex_integer_type_node);
3031 complex_float_type_node = make_node (COMPLEX_TYPE);
3032 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3033 complex_float_type_node));
3034 TREE_TYPE (complex_float_type_node) = float_type_node;
3035 layout_type (complex_float_type_node);
3037 complex_double_type_node = make_node (COMPLEX_TYPE);
3038 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3039 complex_double_type_node));
3040 TREE_TYPE (complex_double_type_node) = double_type_node;
3041 layout_type (complex_double_type_node);
3043 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3044 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3045 complex_long_double_type_node));
3046 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3047 layout_type (complex_long_double_type_node);
3050 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3051 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3052 signed_wchar_type_node = signed_type (wchar_type_node);
3053 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3055 integer_zero_node = build_int_2 (0, 0);
3056 TREE_TYPE (integer_zero_node) = integer_type_node;
3057 integer_one_node = build_int_2 (1, 0);
3058 TREE_TYPE (integer_one_node) = integer_type_node;
3060 boolean_type_node = integer_type_node;
3061 boolean_true_node = integer_one_node;
3062 boolean_false_node = integer_zero_node;
3064 size_zero_node = build_int_2 (0, 0);
3065 TREE_TYPE (size_zero_node) = sizetype;
3066 size_one_node = build_int_2 (1, 0);
3067 TREE_TYPE (size_one_node) = sizetype;
3069 void_type_node = make_node (VOID_TYPE);
3070 pushdecl (build_decl (TYPE_DECL,
3071 ridpointers[(int) RID_VOID], void_type_node));
3072 layout_type (void_type_node); /* Uses integer_zero_node */
3073 /* We are not going to have real types in C with less than byte alignment,
3074 so we might as well not have any types that claim to have it. */
3075 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3077 null_pointer_node = build_int_2 (0, 0);
3078 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3079 layout_type (TREE_TYPE (null_pointer_node));
3081 string_type_node = build_pointer_type (char_type_node);
3082 const_string_type_node
3083 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3085 /* Make a type to be the domain of a few array types
3086 whose domains don't really matter.
3087 200 is small enough that it always fits in size_t
3088 and large enough that it can hold most function names for the
3089 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3090 array_domain_type = build_index_type (build_int_2 (200, 0));
3092 /* make a type for arrays of characters.
3093 With luck nothing will ever really depend on the length of this
3095 char_array_type_node
3096 = build_array_type (char_type_node, array_domain_type);
3097 /* Likewise for arrays of ints. */
3099 = build_array_type (integer_type_node, array_domain_type);
3100 /* This is for wide string constants. */
3101 wchar_array_type_node
3102 = build_array_type (wchar_type_node, array_domain_type);
3104 default_function_type
3105 = build_function_type (integer_type_node, NULL_TREE);
3107 ptr_type_node = build_pointer_type (void_type_node);
3109 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3111 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3114 = build_function_type (void_type_node, NULL_TREE);
3117 = build_function_type (float_type_node,
3118 tree_cons (NULL_TREE, float_type_node, endlink));
3121 = build_function_type (double_type_node,
3122 tree_cons (NULL_TREE, double_type_node, endlink));
3124 ldouble_ftype_ldouble
3125 = build_function_type (long_double_type_node,
3126 tree_cons (NULL_TREE, long_double_type_node,
3129 double_ftype_double_double
3130 = build_function_type (double_type_node,
3131 tree_cons (NULL_TREE, double_type_node,
3132 tree_cons (NULL_TREE,
3133 double_type_node, endlink)));
3136 = build_function_type (integer_type_node,
3137 tree_cons (NULL_TREE, integer_type_node, endlink));
3140 = build_function_type (long_integer_type_node,
3141 tree_cons (NULL_TREE,
3142 long_integer_type_node, endlink));
3144 void_ftype_ptr_ptr_int
3145 = build_function_type (void_type_node,
3146 tree_cons (NULL_TREE, ptr_type_node,
3147 tree_cons (NULL_TREE, ptr_type_node,
3148 tree_cons (NULL_TREE,
3152 int_ftype_cptr_cptr_sizet
3153 = build_function_type (integer_type_node,
3154 tree_cons (NULL_TREE, const_ptr_type_node,
3155 tree_cons (NULL_TREE, const_ptr_type_node,
3156 tree_cons (NULL_TREE,
3160 void_ftype_ptr_int_int
3161 = build_function_type (void_type_node,
3162 tree_cons (NULL_TREE, ptr_type_node,
3163 tree_cons (NULL_TREE, integer_type_node,
3164 tree_cons (NULL_TREE,
3168 string_ftype_ptr_ptr /* strcpy prototype */
3169 = build_function_type (string_type_node,
3170 tree_cons (NULL_TREE, string_type_node,
3171 tree_cons (NULL_TREE,
3172 const_string_type_node,
3175 int_ftype_string_string /* strcmp prototype */
3176 = build_function_type (integer_type_node,
3177 tree_cons (NULL_TREE, const_string_type_node,
3178 tree_cons (NULL_TREE,
3179 const_string_type_node,
3182 strlen_ftype /* strlen prototype */
3183 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3184 tree_cons (NULL_TREE, const_string_type_node,
3187 traditional_ptr_type_node
3188 = (flag_traditional ? string_type_node : ptr_type_node);
3190 memcpy_ftype /* memcpy prototype */
3191 = build_function_type (traditional_ptr_type_node,
3192 tree_cons (NULL_TREE, ptr_type_node,
3193 tree_cons (NULL_TREE, const_ptr_type_node,
3194 tree_cons (NULL_TREE,
3198 memset_ftype /* memset prototype */
3199 = build_function_type (traditional_ptr_type_node,
3200 tree_cons (NULL_TREE, ptr_type_node,
3201 tree_cons (NULL_TREE, integer_type_node,
3202 tree_cons (NULL_TREE,
3206 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3208 = build_function_type (ptr_type_node,
3209 tree_cons (NULL_TREE, ptr_type_node, endlink));
3211 builtin_function ("__builtin_constant_p", default_function_type,
3212 BUILT_IN_CONSTANT_P, NULL_PTR);
3214 builtin_function ("__builtin_return_address",
3215 build_function_type (ptr_type_node,
3216 tree_cons (NULL_TREE,
3219 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3221 builtin_function ("__builtin_frame_address",
3222 build_function_type (ptr_type_node,
3223 tree_cons (NULL_TREE,
3226 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3228 builtin_function ("__builtin_aggregate_incoming_address",
3229 build_function_type (ptr_type_node, NULL_TREE),
3230 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3232 /* Hooks for the DWARF 2 __throw routine. */
3233 builtin_function ("__builtin_unwind_init",
3234 build_function_type (void_type_node, endlink),
3235 BUILT_IN_UNWIND_INIT, NULL_PTR);
3236 builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
3237 builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
3238 builtin_function ("__builtin_dwarf_fp_regnum",
3239 build_function_type (unsigned_type_node, endlink),
3240 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3241 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3242 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3243 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3244 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3245 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3246 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3247 builtin_function ("__builtin_set_return_addr_reg",
3248 build_function_type (void_type_node,
3249 tree_cons (NULL_TREE,
3252 BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
3253 builtin_function ("__builtin_eh_stub", ptr_ftype_void,
3254 BUILT_IN_EH_STUB, NULL_PTR);
3256 ("__builtin_set_eh_regs",
3257 build_function_type (void_type_node,
3258 tree_cons (NULL_TREE, ptr_type_node,
3259 tree_cons (NULL_TREE,
3260 type_for_mode (ptr_mode, 0),
3262 BUILT_IN_SET_EH_REGS, NULL_PTR);
3264 builtin_function ("__builtin_alloca",
3265 build_function_type (ptr_type_node,
3266 tree_cons (NULL_TREE,
3269 BUILT_IN_ALLOCA, "alloca");
3270 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3271 /* Define alloca, ffs as builtins.
3272 Declare _exit just to mark it as volatile. */
3273 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3275 temp = builtin_function ("alloca",
3276 build_function_type (ptr_type_node,
3277 tree_cons (NULL_TREE,
3280 BUILT_IN_ALLOCA, NULL_PTR);
3281 /* Suppress error if redefined as a non-function. */
3282 DECL_BUILT_IN_NONANSI (temp) = 1;
3283 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3284 /* Suppress error if redefined as a non-function. */
3285 DECL_BUILT_IN_NONANSI (temp) = 1;
3286 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3288 TREE_THIS_VOLATILE (temp) = 1;
3289 TREE_SIDE_EFFECTS (temp) = 1;
3290 /* Suppress error if redefined as a non-function. */
3291 DECL_BUILT_IN_NONANSI (temp) = 1;
3294 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3295 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3297 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3299 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3301 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3303 builtin_function ("__builtin_saveregs",
3304 build_function_type (ptr_type_node, NULL_TREE),
3305 BUILT_IN_SAVEREGS, NULL_PTR);
3306 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3308 builtin_function ("__builtin_varargs",
3309 build_function_type (ptr_type_node,
3310 tree_cons (NULL_TREE,
3313 BUILT_IN_VARARGS, NULL_PTR);
3315 builtin_function ("__builtin_classify_type", default_function_type,
3316 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3317 builtin_function ("__builtin_next_arg",
3318 build_function_type (ptr_type_node, NULL_TREE),
3319 BUILT_IN_NEXT_ARG, NULL_PTR);
3320 builtin_function ("__builtin_args_info",
3321 build_function_type (integer_type_node,
3322 tree_cons (NULL_TREE,
3325 BUILT_IN_ARGS_INFO, NULL_PTR);
3327 /* Untyped call and return. */
3328 builtin_function ("__builtin_apply_args",
3329 build_function_type (ptr_type_node, NULL_TREE),
3330 BUILT_IN_APPLY_ARGS, NULL_PTR);
3332 temp = tree_cons (NULL_TREE,
3333 build_pointer_type (build_function_type (void_type_node,
3335 tree_cons (NULL_TREE,
3337 tree_cons (NULL_TREE,
3340 builtin_function ("__builtin_apply",
3341 build_function_type (ptr_type_node, temp),
3342 BUILT_IN_APPLY, NULL_PTR);
3343 builtin_function ("__builtin_return",
3344 build_function_type (void_type_node,
3345 tree_cons (NULL_TREE,
3348 BUILT_IN_RETURN, NULL_PTR);
3350 /* Currently under experimentation. */
3351 builtin_function ("__builtin_memcpy", memcpy_ftype,
3352 BUILT_IN_MEMCPY, "memcpy");
3353 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3354 BUILT_IN_MEMCMP, "memcmp");
3355 builtin_function ("__builtin_memset", memset_ftype,
3356 BUILT_IN_MEMSET, "memset");
3357 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3358 BUILT_IN_STRCMP, "strcmp");
3359 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3360 BUILT_IN_STRCPY, "strcpy");
3361 builtin_function ("__builtin_strlen", strlen_ftype,
3362 BUILT_IN_STRLEN, "strlen");
3363 builtin_function ("__builtin_sqrtf", float_ftype_float,
3364 BUILT_IN_FSQRT, "sqrtf");
3365 builtin_function ("__builtin_fsqrt", double_ftype_double,
3366 BUILT_IN_FSQRT, "sqrt");
3367 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3368 BUILT_IN_FSQRT, "sqrtl");
3369 builtin_function ("__builtin_sinf", float_ftype_float,
3370 BUILT_IN_SIN, "sinf");
3371 builtin_function ("__builtin_sin", double_ftype_double,
3372 BUILT_IN_SIN, "sin");
3373 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3374 BUILT_IN_SIN, "sinl");
3375 builtin_function ("__builtin_cosf", float_ftype_float,
3376 BUILT_IN_COS, "cosf");
3377 builtin_function ("__builtin_cos", double_ftype_double,
3378 BUILT_IN_COS, "cos");
3379 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3380 BUILT_IN_COS, "cosl");
3381 builtin_function ("__builtin_setjmp",
3382 build_function_type (integer_type_node,
3383 tree_cons (NULL_TREE,
3384 ptr_type_node, endlink)),
3385 BUILT_IN_SETJMP, NULL_PTR);
3386 builtin_function ("__builtin_longjmp",
3389 tree_cons (NULL, ptr_type_node,
3390 tree_cons (NULL_TREE,
3393 BUILT_IN_LONGJMP, NULL_PTR);
3395 /* In an ANSI C program, it is okay to supply built-in meanings
3396 for these functions, since applications cannot validly use them
3397 with any other meaning.
3398 However, honor the -fno-builtin option. */
3399 if (!flag_no_builtin)
3401 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3402 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3403 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3404 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3406 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3407 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3408 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3410 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3411 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3413 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3415 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3416 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3417 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3418 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3420 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3421 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3422 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3423 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3424 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3425 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3427 /* Declare these functions volatile
3428 to avoid spurious "control drops through" warnings. */
3429 /* Don't specify the argument types, to avoid errors
3430 from certain code which isn't valid in ANSI but which exists. */
3431 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3433 TREE_THIS_VOLATILE (temp) = 1;
3434 TREE_SIDE_EFFECTS (temp) = 1;
3435 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3436 TREE_THIS_VOLATILE (temp) = 1;
3437 TREE_SIDE_EFFECTS (temp) = 1;
3441 /* Support for these has not been written in either expand_builtin
3442 or build_function_call. */
3443 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3444 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3445 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3447 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3449 builtin_function ("__builtin_fmod", double_ftype_double_double,
3450 BUILT_IN_FMOD, NULL_PTR);
3451 builtin_function ("__builtin_frem", double_ftype_double_double,
3452 BUILT_IN_FREM, NULL_PTR);
3453 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3455 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3459 pedantic_lvalues = pedantic;
3461 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3462 declare_function_name ();
3464 start_identifier_warnings ();
3466 /* Prepare to check format strings against argument lists. */
3467 init_function_format_info ();
3471 incomplete_decl_finalize_hook = finish_incomplete_decl;
3474 /* Return a definition for a builtin function named NAME and whose data type
3475 is TYPE. TYPE should be a function type with argument types.
3476 FUNCTION_CODE tells later passes how to compile calls to this function.
3477 See tree.h for its possible values.
3479 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3480 the name to be called if we can't opencode the function. */
3483 builtin_function (name, type, function_code, library_name)
3486 enum built_in_function function_code;
3489 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3490 DECL_EXTERNAL (decl) = 1;
3491 TREE_PUBLIC (decl) = 1;
3492 /* If -traditional, permit redefining a builtin function any way you like.
3493 (Though really, if the program redefines these functions,
3494 it probably won't work right unless compiled with -fno-builtin.) */
3495 if (flag_traditional && name[0] != '_')
3496 DECL_BUILT_IN_NONANSI (decl) = 1;
3498 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3499 make_decl_rtl (decl, NULL_PTR, 1);
3501 if (function_code != NOT_BUILT_IN)
3503 DECL_BUILT_IN (decl) = 1;
3504 DECL_FUNCTION_CODE (decl) = function_code;
3506 /* Warn if a function in the namespace for users
3507 is used without an occasion to consider it declared. */
3508 if (name[0] != '_' || name[1] != '_')
3509 C_DECL_ANTICIPATED (decl) = 1;
3514 /* Called when a declaration is seen that contains no names to declare.
3515 If its type is a reference to a structure, union or enum inherited
3516 from a containing scope, shadow that tag name for the current scope
3517 with a forward reference.
3518 If its type defines a new named structure or union
3519 or defines an enum, it is valid but we need not do anything here.
3520 Otherwise, it is an error. */
3523 shadow_tag (declspecs)
3526 shadow_tag_warned (declspecs, 0);
3530 shadow_tag_warned (declspecs, warned)
3533 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3539 pending_invalid_xref = 0;
3541 for (link = declspecs; link; link = TREE_CHAIN (link))
3543 register tree value = TREE_VALUE (link);
3544 register enum tree_code code = TREE_CODE (value);
3546 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3547 /* Used to test also that TYPE_SIZE (value) != 0.
3548 That caused warning for `struct foo;' at top level in the file. */
3550 register tree name = lookup_tag_reverse (value);
3557 if (warned != 1 && code != ENUMERAL_TYPE)
3558 /* Empty unnamed enum OK */
3560 pedwarn ("unnamed struct/union that defines no instances");
3566 t = lookup_tag (code, name, current_binding_level, 1);
3570 t = make_node (code);
3577 if (!warned && ! in_system_header)
3579 warning ("useless keyword or type name in empty declaration");
3586 error ("two types specified in one empty declaration");
3591 pedwarn ("empty declaration");
3595 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3598 groktypename (typename)
3601 if (TREE_CODE (typename) != TREE_LIST)
3603 return grokdeclarator (TREE_VALUE (typename),
3604 TREE_PURPOSE (typename),
3608 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3611 groktypename_in_parm_context (typename)
3614 if (TREE_CODE (typename) != TREE_LIST)
3616 return grokdeclarator (TREE_VALUE (typename),
3617 TREE_PURPOSE (typename),
3621 /* Decode a declarator in an ordinary declaration or data definition.
3622 This is called as soon as the type information and variable name
3623 have been parsed, before parsing the initializer if any.
3624 Here we create the ..._DECL node, fill in its type,
3625 and put it on the list of decls for the current context.
3626 The ..._DECL node is returned as the value.
3628 Exception: for arrays where the length is not specified,
3629 the type is left null, to be filled in by `finish_decl'.
3631 Function definitions do not come here; they go to start_function
3632 instead. However, external and forward declarations of functions
3633 do go through here. Structure field declarations are done by
3634 grokfield and not through here. */
3636 /* Set this to zero to debug not using the temporary obstack
3637 to parse initializers. */
3638 int debug_temp_inits = 1;
3641 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3642 tree declarator, declspecs;
3644 tree attributes, prefix_attributes;
3646 register tree decl = grokdeclarator (declarator, declspecs,
3647 NORMAL, initialized);
3649 int init_written = initialized;
3651 /* The corresponding pop_obstacks is in finish_decl. */
3652 push_obstacks_nochange ();
3654 if (warn_main && !strcmp (IDENTIFIER_POINTER (declarator), "main"))
3655 warning_with_decl (decl, "`%s' is usually a function");
3658 /* Is it valid for this decl to have an initializer at all?
3659 If not, set INITIALIZED to zero, which will indirectly
3660 tell `finish_decl' to ignore the initializer once it is parsed. */
3661 switch (TREE_CODE (decl))
3664 /* typedef foo = bar means give foo the same type as bar.
3665 We haven't parsed bar yet, so `finish_decl' will fix that up.
3666 Any other case of an initialization in a TYPE_DECL is an error. */
3667 if (pedantic || list_length (declspecs) > 1)
3669 error ("typedef `%s' is initialized",
3670 IDENTIFIER_POINTER (DECL_NAME (decl)));
3676 error ("function `%s' is initialized like a variable",
3677 IDENTIFIER_POINTER (DECL_NAME (decl)));
3682 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3683 error ("parameter `%s' is initialized",
3684 IDENTIFIER_POINTER (DECL_NAME (decl)));
3689 /* Don't allow initializations for incomplete types
3690 except for arrays which might be completed by the initialization. */
3691 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3693 /* A complete type is ok if size is fixed. */
3695 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3696 || C_DECL_VARIABLE_SIZE (decl))
3698 error ("variable-sized object may not be initialized");
3702 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3704 error ("variable `%s' has initializer but incomplete type",
3705 IDENTIFIER_POINTER (DECL_NAME (decl)));
3708 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3710 error ("elements of array `%s' have incomplete type",
3711 IDENTIFIER_POINTER (DECL_NAME (decl)));
3718 #if 0 /* Seems redundant with grokdeclarator. */
3719 if (current_binding_level != global_binding_level
3720 && DECL_EXTERNAL (decl)
3721 && TREE_CODE (decl) != FUNCTION_DECL)
3722 warning ("declaration of `%s' has `extern' and is initialized",
3723 IDENTIFIER_POINTER (DECL_NAME (decl)));
3725 DECL_EXTERNAL (decl) = 0;
3726 if (current_binding_level == global_binding_level)
3727 TREE_STATIC (decl) = 1;
3729 /* Tell `pushdecl' this is an initialized decl
3730 even though we don't yet have the initializer expression.
3731 Also tell `finish_decl' it may store the real initializer. */
3732 DECL_INITIAL (decl) = error_mark_node;
3735 /* If this is a function declaration, write a record describing it to the
3736 prototypes file (if requested). */
3738 if (TREE_CODE (decl) == FUNCTION_DECL)
3739 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3741 /* ANSI specifies that a tentative definition which is not merged with
3742 a non-tentative definition behaves exactly like a definition with an
3743 initializer equal to zero. (Section 3.7.2)
3744 -fno-common gives strict ANSI behavior. Usually you don't want it.
3745 This matters only for variables with external linkage. */
3746 if (! flag_no_common || ! TREE_PUBLIC (decl))
3747 DECL_COMMON (decl) = 1;
3749 /* Set attributes here so if duplicate decl, will have proper attributes. */
3750 decl_attributes (decl, attributes, prefix_attributes);
3752 /* Add this decl to the current binding level.
3753 TEM may equal DECL or it may be a previous decl of the same name. */
3754 tem = pushdecl (decl);
3756 /* For a local variable, define the RTL now. */
3757 if (current_binding_level != global_binding_level
3758 /* But not if this is a duplicate decl
3759 and we preserved the rtl from the previous one
3760 (which may or may not happen). */
3761 && DECL_RTL (tem) == 0)
3763 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3765 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3766 && DECL_INITIAL (tem) != 0)
3772 /* When parsing and digesting the initializer,
3773 use temporary storage. Do this even if we will ignore the value. */
3774 if (current_binding_level == global_binding_level && debug_temp_inits)
3775 temporary_allocation ();
3781 /* Finish processing of a declaration;
3782 install its initial value.
3783 If the length of an array type is not known before,
3784 it must be determined now, from the initial value, or it is an error. */
3787 finish_decl (decl, init, asmspec_tree)
3791 register tree type = TREE_TYPE (decl);
3792 int was_incomplete = (DECL_SIZE (decl) == 0);
3793 int temporary = allocation_temporary_p ();
3796 /* If a name was specified, get the string. */
3798 asmspec = TREE_STRING_POINTER (asmspec_tree);
3800 /* If `start_decl' didn't like having an initialization, ignore it now. */
3802 if (init != 0 && DECL_INITIAL (decl) == 0)
3804 /* Don't crash if parm is initialized. */
3805 if (TREE_CODE (decl) == PARM_DECL)
3808 if (ITERATOR_P (decl))
3811 error_with_decl (decl, "iterator has no initial value");
3813 init = save_expr (init);
3818 if (TREE_CODE (decl) != TYPE_DECL)
3819 store_init_value (decl, init);
3822 /* typedef foo = bar; store the type of bar as the type of foo. */
3823 TREE_TYPE (decl) = TREE_TYPE (init);
3824 DECL_INITIAL (decl) = init = 0;
3828 /* Pop back to the obstack that is current for this binding level.
3829 This is because MAXINDEX, rtl, etc. to be made below
3830 must go in the permanent obstack. But don't discard the
3831 temporary data yet. */
3833 #if 0 /* pop_obstacks was near the end; this is what was here. */
3834 if (current_binding_level == global_binding_level && temporary)
3835 end_temporary_allocation ();
3838 /* Deduce size of array from initialization, if not already known */
3840 if (TREE_CODE (type) == ARRAY_TYPE
3841 && TYPE_DOMAIN (type) == 0
3842 && TREE_CODE (decl) != TYPE_DECL)
3845 = (TREE_STATIC (decl)
3846 /* Even if pedantic, an external linkage array
3847 may have incomplete type at first. */
3848 ? pedantic && !TREE_PUBLIC (decl)
3849 : !DECL_EXTERNAL (decl));
3851 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3853 /* Get the completed type made by complete_array_type. */
3854 type = TREE_TYPE (decl);
3857 error_with_decl (decl, "initializer fails to determine size of `%s'");
3862 error_with_decl (decl, "array size missing in `%s'");
3863 /* If a `static' var's size isn't known,
3864 make it extern as well as static, so it does not get
3866 If it is not `static', then do not mark extern;
3867 finish_incomplete_decl will give it a default size
3868 and it will get allocated. */
3869 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3870 DECL_EXTERNAL (decl) = 1;
3873 /* TYPE_MAX_VALUE is always one less than the number of elements
3874 in the array, because we start counting at zero. Therefore,
3875 warn only if the value is less than zero. */
3876 if (pedantic && TYPE_DOMAIN (type) != 0
3877 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3878 error_with_decl (decl, "zero or negative size array `%s'");
3880 layout_decl (decl, 0);
3883 if (TREE_CODE (decl) == VAR_DECL)
3885 if (DECL_SIZE (decl) == 0
3886 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3887 layout_decl (decl, 0);
3889 if (DECL_SIZE (decl) == 0
3890 && (TREE_STATIC (decl)
3892 /* A static variable with an incomplete type
3893 is an error if it is initialized.
3894 Also if it is not file scope.
3895 Otherwise, let it through, but if it is not `extern'
3896 then it may cause an error message later. */
3897 /* A duplicate_decls call could have changed an extern
3898 declaration into a file scope one. This can be detected
3899 by TREE_ASM_WRITTEN being set. */
3900 (DECL_INITIAL (decl) != 0
3901 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3903 /* An automatic variable with an incomplete type
3905 !DECL_EXTERNAL (decl)))
3907 error_with_decl (decl, "storage size of `%s' isn't known");
3908 TREE_TYPE (decl) = error_mark_node;
3911 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3912 && DECL_SIZE (decl) != 0)
3914 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3915 constant_expression_warning (DECL_SIZE (decl));
3917 error_with_decl (decl, "storage size of `%s' isn't constant");
3920 if (TREE_USED (type))
3921 TREE_USED (decl) = 1;
3924 /* If this is a function and an assembler name is specified, it isn't
3925 builtin any more. Also reset DECL_RTL so we can give it its new
3927 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3929 DECL_BUILT_IN (decl) = 0;
3930 DECL_RTL (decl) = 0;
3933 /* Output the assembler code and/or RTL code for variables and functions,
3934 unless the type is an undefined structure or union.
3935 If not, it will get done when the type is completed. */
3937 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3939 if ((flag_traditional || TREE_PERMANENT (decl))
3940 && allocation_temporary_p ())
3942 push_obstacks_nochange ();
3943 end_temporary_allocation ();
3944 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3945 maybe_objc_check_decl (decl);
3946 rest_of_decl_compilation (decl, asmspec,
3947 (DECL_CONTEXT (decl) == 0
3948 || TREE_ASM_WRITTEN (decl)),
3954 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3955 maybe_objc_check_decl (decl);
3956 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3959 if (DECL_CONTEXT (decl) != 0)
3961 /* Recompute the RTL of a local array now
3962 if it used to be an incomplete type. */
3964 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3966 /* If we used it already as memory, it must stay in memory. */
3967 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3968 /* If it's still incomplete now, no init will save it. */
3969 if (DECL_SIZE (decl) == 0)
3970 DECL_INITIAL (decl) = 0;
3973 /* Compute and store the initial value. */
3974 if (TREE_CODE (decl) != FUNCTION_DECL)
3975 expand_decl_init (decl);
3979 if (TREE_CODE (decl) == TYPE_DECL)
3981 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3982 maybe_objc_check_decl (decl);
3983 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3987 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3988 /* This test used to include TREE_PERMANENT, however, we have the same
3989 problem with initializers at the function level. Such initializers get
3990 saved until the end of the function on the momentary_obstack. */
3991 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3993 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3994 space with DECL_ARG_TYPE. */
3995 && TREE_CODE (decl) != PARM_DECL)
3997 /* We need to remember that this array HAD an initialization,
3998 but discard the actual temporary nodes,
3999 since we can't have a permanent node keep pointing to them. */
4000 /* We make an exception for inline functions, since it's
4001 normal for a local extern redeclaration of an inline function
4002 to have a copy of the top-level decl's DECL_INLINE. */
4003 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4005 /* If this is a const variable, then preserve the
4006 initializer instead of discarding it so that we can optimize
4007 references to it. */
4008 /* This test used to include TREE_STATIC, but this won't be set
4009 for function level initializers. */
4010 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4012 preserve_initializer ();
4013 /* Hack? Set the permanent bit for something that is permanent,
4014 but not on the permanent obstack, so as to convince
4015 output_constant_def to make its rtl on the permanent
4017 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4019 /* The initializer and DECL must have the same (or equivalent
4020 types), but if the initializer is a STRING_CST, its type
4021 might not be on the right obstack, so copy the type
4023 TREE_TYPE (DECL_INITIAL (decl)) = type;
4026 DECL_INITIAL (decl) = error_mark_node;
4030 /* If requested, warn about definitions of large data objects. */
4032 if (warn_larger_than
4033 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4034 && !DECL_EXTERNAL (decl))
4036 register tree decl_size = DECL_SIZE (decl);
4038 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4040 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4042 if (units > larger_than_size)
4043 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4048 /* Resume permanent allocation, if not within a function. */
4049 /* The corresponding push_obstacks_nochange is in start_decl,
4050 and in push_parm_decl and in grokfield. */
4054 /* If we have gone back from temporary to permanent allocation,
4055 actually free the temporary space that we no longer need. */
4056 if (temporary && !allocation_temporary_p ())
4057 permanent_allocation (0);
4059 /* At the end of a declaration, throw away any variable type sizes
4060 of types defined inside that declaration. There is no use
4061 computing them in the following function definition. */
4062 if (current_binding_level == global_binding_level)
4063 get_pending_sizes ();
4066 /* If DECL has a cleanup, build and return that cleanup here.
4067 This is a callback called by expand_expr. */
4070 maybe_build_cleanup (decl)
4073 /* There are no cleanups in C. */
4077 /* Given a parsed parameter declaration,
4078 decode it into a PARM_DECL and push that on the current binding level.
4079 Also, for the sake of forward parm decls,
4080 record the given order of parms in `parm_order'. */
4083 push_parm_decl (parm)
4087 int old_immediate_size_expand = immediate_size_expand;
4088 /* Don't try computing parm sizes now -- wait till fn is called. */
4089 immediate_size_expand = 0;
4091 /* The corresponding pop_obstacks is in finish_decl. */
4092 push_obstacks_nochange ();
4094 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4095 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4096 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4097 TREE_PURPOSE (TREE_VALUE (parm)));
4100 if (DECL_NAME (decl))
4103 olddecl = lookup_name (DECL_NAME (decl));
4104 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4105 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4109 decl = pushdecl (decl);
4111 immediate_size_expand = old_immediate_size_expand;
4113 current_binding_level->parm_order
4114 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4116 /* Add this decl to the current binding level. */
4117 finish_decl (decl, NULL_TREE, NULL_TREE);
4120 /* Clear the given order of parms in `parm_order'.
4121 Used at start of parm list,
4122 and also at semicolon terminating forward decls. */
4127 current_binding_level->parm_order = NULL_TREE;
4130 /* Make TYPE a complete type based on INITIAL_VALUE.
4131 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4132 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4135 complete_array_type (type, initial_value, do_default)
4140 register tree maxindex = NULL_TREE;
4145 /* Note MAXINDEX is really the maximum index,
4146 one less than the size. */
4147 if (TREE_CODE (initial_value) == STRING_CST)
4150 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4151 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4154 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4156 tree elts = CONSTRUCTOR_ELTS (initial_value);
4157 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4158 for (; elts; elts = TREE_CHAIN (elts))
4160 if (TREE_PURPOSE (elts))
4161 maxindex = TREE_PURPOSE (elts);
4163 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4165 maxindex = copy_node (maxindex);
4169 /* Make an error message unless that happened already. */
4170 if (initial_value != error_mark_node)
4173 /* Prevent further error messages. */
4174 maxindex = build_int_2 (0, 0);
4181 maxindex = build_int_2 (0, 0);
4187 TYPE_DOMAIN (type) = build_index_type (maxindex);
4188 if (!TREE_TYPE (maxindex))
4189 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4192 /* Lay out the type now that we can get the real answer. */
4199 /* Given declspecs and a declarator,
4200 determine the name and type of the object declared
4201 and construct a ..._DECL node for it.
4202 (In one case we can return a ..._TYPE node instead.
4203 For invalid input we sometimes return 0.)
4205 DECLSPECS is a chain of tree_list nodes whose value fields
4206 are the storage classes and type specifiers.
4208 DECL_CONTEXT says which syntactic context this declaration is in:
4209 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4210 FUNCDEF for a function definition. Like NORMAL but a few different
4211 error messages in each case. Return value may be zero meaning
4212 this definition is too screwy to try to parse.
4213 PARM for a parameter declaration (either within a function prototype
4214 or before a function body). Make a PARM_DECL, or return void_type_node.
4215 TYPENAME if for a typename (in a cast or sizeof).
4216 Don't make a DECL node; just return the ..._TYPE node.
4217 FIELD for a struct or union field; make a FIELD_DECL.
4218 BITFIELD for a field with specified width.
4219 INITIALIZED is 1 if the decl has an initializer.
4221 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4222 It may also be so in the PARM case, for a prototype where the
4223 argument type is specified but not the name.
4225 This function is where the complicated C meanings of `static'
4226 and `extern' are interpreted. */
4229 grokdeclarator (declarator, declspecs, decl_context, initialized)
4232 enum decl_context decl_context;
4237 tree type = NULL_TREE;
4242 int explicit_int = 0;
4243 int explicit_char = 0;
4244 int defaulted_int = 0;
4245 tree typedef_decl = 0;
4247 tree typedef_type = 0;
4248 int funcdef_flag = 0;
4249 enum tree_code innermost_code = ERROR_MARK;
4251 int size_varies = 0;
4252 tree decl_machine_attr = NULL_TREE;
4254 if (decl_context == BITFIELD)
4255 bitfield = 1, decl_context = FIELD;
4257 if (decl_context == FUNCDEF)
4258 funcdef_flag = 1, decl_context = NORMAL;
4260 push_obstacks_nochange ();
4262 if (flag_traditional && allocation_temporary_p ())
4263 end_temporary_allocation ();
4265 /* Look inside a declarator for the name being declared
4266 and get it as a string, for an error message. */
4268 register tree decl = declarator;
4272 switch (TREE_CODE (decl))
4277 innermost_code = TREE_CODE (decl);
4278 decl = TREE_OPERAND (decl, 0);
4281 case IDENTIFIER_NODE:
4282 name = IDENTIFIER_POINTER (decl);
4293 /* A function definition's declarator must have the form of
4294 a function declarator. */
4296 if (funcdef_flag && innermost_code != CALL_EXPR)
4299 /* Anything declared one level down from the top level
4300 must be one of the parameters of a function
4301 (because the body is at least two levels down). */
4303 /* If this looks like a function definition, make it one,
4304 even if it occurs where parms are expected.
4305 Then store_parm_decls will reject it and not use it as a parm. */
4306 if (decl_context == NORMAL && !funcdef_flag
4307 && current_binding_level->parm_flag)
4308 decl_context = PARM;
4310 /* Look through the decl specs and record which ones appear.
4311 Some typespecs are defined as built-in typenames.
4312 Others, the ones that are modifiers of other types,
4313 are represented by bits in SPECBITS: set the bits for
4314 the modifiers that appear. Storage class keywords are also in SPECBITS.
4316 If there is a typedef name or a type, store the type in TYPE.
4317 This includes builtin typedefs such as `int'.
4319 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4320 and did not come from a user typedef.
4322 Set LONGLONG if `long' is mentioned twice. */
4324 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4327 register tree id = TREE_VALUE (spec);
4329 if (id == ridpointers[(int) RID_INT])
4331 if (id == ridpointers[(int) RID_CHAR])
4334 if (TREE_CODE (id) == IDENTIFIER_NODE)
4335 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4337 if (ridpointers[i] == id)
4339 if (i == (int) RID_LONG && specbits & (1<<i))
4342 error ("`long long long' is too long for GCC");
4345 if (pedantic && ! in_system_header)
4346 pedwarn ("ANSI C does not support `long long'");
4350 else if (specbits & (1 << i))
4351 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4357 error ("two or more data types in declaration of `%s'", name);
4358 /* Actual typedefs come to us as TYPE_DECL nodes. */
4359 else if (TREE_CODE (id) == TYPE_DECL)
4361 type = TREE_TYPE (id);
4362 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4365 /* Built-in types come as identifiers. */
4366 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4368 register tree t = lookup_name (id);
4369 if (TREE_TYPE (t) == error_mark_node)
4371 else if (!t || TREE_CODE (t) != TYPE_DECL)
4372 error ("`%s' fails to be a typedef or built in type",
4373 IDENTIFIER_POINTER (id));
4376 type = TREE_TYPE (t);
4380 else if (TREE_CODE (id) != ERROR_MARK)
4386 typedef_type = type;
4388 size_varies = C_TYPE_VARIABLE_SIZE (type);
4390 /* No type at all: default to `int', and set DEFAULTED_INT
4391 because it was not a user-defined typedef. */
4395 if (! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4396 | (1 << (int) RID_SIGNED)
4397 | (1 << (int) RID_UNSIGNED))))
4399 /* C9x will probably require a diagnostic here.
4400 For now, issue a warning if -Wreturn-type and this is a function,
4401 or if -Wimplicit; prefer the former warning since it is more
4403 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4404 warn_about_return_type = 1;
4405 else if (warn_implicit_int)
4406 warning ("type defaults to `int' in declaration of `%s'", name);
4410 type = integer_type_node;
4413 /* Now process the modifiers that were specified
4414 and check for invalid combinations. */
4416 /* Long double is a special combination. */
4418 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4419 && TYPE_MAIN_VARIANT (type) == double_type_node)
4421 specbits &= ~ (1 << (int) RID_LONG);
4422 type = long_double_type_node;
4425 /* Check all other uses of type modifiers. */
4427 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4428 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4432 if ((specbits & 1 << (int) RID_LONG)
4433 && (specbits & 1 << (int) RID_SHORT))
4434 error ("both long and short specified for `%s'", name);
4435 else if (((specbits & 1 << (int) RID_LONG)
4436 || (specbits & 1 << (int) RID_SHORT))
4438 error ("long or short specified with char for `%s'", name);
4439 else if (((specbits & 1 << (int) RID_LONG)
4440 || (specbits & 1 << (int) RID_SHORT))
4441 && TREE_CODE (type) == REAL_TYPE)
4443 static int already = 0;
4445 error ("long or short specified with floating type for `%s'", name);
4446 if (! already && ! pedantic)
4448 error ("the only valid combination is `long double'");
4452 else if ((specbits & 1 << (int) RID_SIGNED)
4453 && (specbits & 1 << (int) RID_UNSIGNED))
4454 error ("both signed and unsigned specified for `%s'", name);
4455 else if (TREE_CODE (type) != INTEGER_TYPE)
4456 error ("long, short, signed or unsigned invalid for `%s'", name);
4460 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4462 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4464 if (flag_pedantic_errors)
4469 /* Discard the type modifiers if they are invalid. */
4472 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4473 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4478 if ((specbits & (1 << (int) RID_COMPLEX))
4479 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4481 error ("complex invalid for `%s'", name);
4482 specbits &= ~ (1 << (int) RID_COMPLEX);
4485 /* Decide whether an integer type is signed or not.
4486 Optionally treat bitfields as signed by default. */
4487 if (specbits & 1 << (int) RID_UNSIGNED
4488 /* Traditionally, all bitfields are unsigned. */
4489 || (bitfield && flag_traditional
4490 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4491 || (bitfield && ! flag_signed_bitfields
4492 && (explicit_int || defaulted_int || explicit_char
4493 /* A typedef for plain `int' without `signed'
4494 can be controlled just like plain `int'. */
4495 || ! (typedef_decl != 0
4496 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4497 && TREE_CODE (type) != ENUMERAL_TYPE
4498 && !(specbits & 1 << (int) RID_SIGNED)))
4501 type = long_long_unsigned_type_node;
4502 else if (specbits & 1 << (int) RID_LONG)
4503 type = long_unsigned_type_node;
4504 else if (specbits & 1 << (int) RID_SHORT)
4505 type = short_unsigned_type_node;
4506 else if (type == char_type_node)
4507 type = unsigned_char_type_node;
4508 else if (typedef_decl)
4509 type = unsigned_type (type);
4511 type = unsigned_type_node;
4513 else if ((specbits & 1 << (int) RID_SIGNED)
4514 && type == char_type_node)
4515 type = signed_char_type_node;
4517 type = long_long_integer_type_node;
4518 else if (specbits & 1 << (int) RID_LONG)
4519 type = long_integer_type_node;
4520 else if (specbits & 1 << (int) RID_SHORT)
4521 type = short_integer_type_node;
4523 if (specbits & 1 << (int) RID_COMPLEX)
4525 /* If we just have "complex", it is equivalent to
4526 "complex double", but if any modifiers at all are specified it is
4527 the complex form of TYPE. E.g, "complex short" is
4528 "complex short int". */
4530 if (defaulted_int && ! longlong
4531 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4532 | (1 << (int) RID_SIGNED)
4533 | (1 << (int) RID_UNSIGNED))))
4534 type = complex_double_type_node;
4535 else if (type == integer_type_node)
4536 type = complex_integer_type_node;
4537 else if (type == float_type_node)
4538 type = complex_float_type_node;
4539 else if (type == double_type_node)
4540 type = complex_double_type_node;
4541 else if (type == long_double_type_node)
4542 type = complex_long_double_type_node;
4544 type = build_complex_type (type);
4547 /* Set CONSTP if this declaration is `const', whether by
4548 explicit specification or via a typedef.
4549 Likewise for VOLATILEP. */
4551 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4552 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4553 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4555 pedwarn ("duplicate `const'");
4557 pedwarn ("duplicate `volatile'");
4558 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4559 type = TYPE_MAIN_VARIANT (type);
4561 /* Warn if two storage classes are given. Default to `auto'. */
4566 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4567 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4568 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4569 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4570 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4571 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4573 /* Warn about storage classes that are invalid for certain
4574 kinds of declarations (parameters, typenames, etc.). */
4577 error ("multiple storage classes in declaration of `%s'", name);
4578 else if (funcdef_flag
4580 & ((1 << (int) RID_REGISTER)
4581 | (1 << (int) RID_AUTO)
4582 | (1 << (int) RID_TYPEDEF))))
4584 if (specbits & 1 << (int) RID_AUTO
4585 && (pedantic || current_binding_level == global_binding_level))
4586 pedwarn ("function definition declared `auto'");
4587 if (specbits & 1 << (int) RID_REGISTER)
4588 error ("function definition declared `register'");
4589 if (specbits & 1 << (int) RID_TYPEDEF)
4590 error ("function definition declared `typedef'");
4591 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4592 | (1 << (int) RID_AUTO));
4594 else if (decl_context != NORMAL && nclasses > 0)
4596 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4600 error ((decl_context == FIELD
4601 ? "storage class specified for structure field `%s'"
4602 : (decl_context == PARM
4603 ? "storage class specified for parameter `%s'"
4604 : "storage class specified for typename")),
4606 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4607 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4608 | (1 << (int) RID_EXTERN));
4611 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4613 /* `extern' with initialization is invalid if not at top level. */
4614 if (current_binding_level == global_binding_level)
4615 warning ("`%s' initialized and declared `extern'", name);
4617 error ("`%s' has both `extern' and initializer", name);
4619 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4620 && current_binding_level != global_binding_level)
4621 error ("nested function `%s' declared `extern'", name);
4622 else if (current_binding_level == global_binding_level
4623 && specbits & (1 << (int) RID_AUTO))
4624 error ("top-level declaration of `%s' specifies `auto'", name);
4625 else if ((specbits & 1 << (int) RID_ITERATOR)
4626 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4628 error ("iterator `%s' has derived type", name);
4629 type = error_mark_node;
4631 else if ((specbits & 1 << (int) RID_ITERATOR)
4632 && TREE_CODE (type) != INTEGER_TYPE)
4634 error ("iterator `%s' has noninteger type", name);
4635 type = error_mark_node;
4639 /* Now figure out the structure of the declarator proper.
4640 Descend through it, creating more complex types, until we reach
4641 the declared identifier (or NULL_TREE, in an absolute declarator). */
4643 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4645 if (type == error_mark_node)
4647 declarator = TREE_OPERAND (declarator, 0);
4651 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4652 an INDIRECT_REF (for *...),
4653 a CALL_EXPR (for ...(...)),
4654 an identifier (for the name being declared)
4655 or a null pointer (for the place in an absolute declarator
4656 where the name was omitted).
4657 For the last two cases, we have just exited the loop.
4659 At this point, TYPE is the type of elements of an array,
4660 or for a function to return, or for a pointer to point to.
4661 After this sequence of ifs, TYPE is the type of the
4662 array or function or pointer, and DECLARATOR has had its
4663 outermost layer removed. */
4665 if (TREE_CODE (declarator) == ARRAY_REF)
4667 register tree itype = NULL_TREE;
4668 register tree size = TREE_OPERAND (declarator, 1);
4669 /* An uninitialized decl with `extern' is a reference. */
4670 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4671 /* The index is a signed object `sizetype' bits wide. */
4672 tree index_type = signed_type (sizetype);
4674 declarator = TREE_OPERAND (declarator, 0);
4676 /* Check for some types that there cannot be arrays of. */
4678 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4680 error ("declaration of `%s' as array of voids", name);
4681 type = error_mark_node;
4684 if (TREE_CODE (type) == FUNCTION_TYPE)
4686 error ("declaration of `%s' as array of functions", name);
4687 type = error_mark_node;
4690 if (size == error_mark_node)
4691 type = error_mark_node;
4693 if (type == error_mark_node)
4696 /* If this is a block level extern, it must live past the end
4697 of the function so that we can check it against other extern
4698 declarations (IDENTIFIER_LIMBO_VALUE). */
4699 if (extern_ref && allocation_temporary_p ())
4700 end_temporary_allocation ();
4702 /* If size was specified, set ITYPE to a range-type for that size.
4703 Otherwise, ITYPE remains null. finish_decl may figure it out
4704 from an initial value. */
4708 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4709 STRIP_TYPE_NOPS (size);
4711 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4712 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4714 error ("size of array `%s' has non-integer type", name);
4715 size = integer_one_node;
4718 if (pedantic && integer_zerop (size))
4719 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4721 if (TREE_CODE (size) == INTEGER_CST)
4723 constant_expression_warning (size);
4724 if (tree_int_cst_sgn (size) < 0)
4726 error ("size of array `%s' is negative", name);
4727 size = integer_one_node;
4732 /* Make sure the array size remains visibly nonconstant
4733 even if it is (eg) a const variable with known value. */
4738 if (TREE_CONSTANT (size))
4739 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4741 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4745 /* Convert size to index_type, so that if it is a variable
4746 the computations will be done in the proper mode. */
4747 itype = fold (build (MINUS_EXPR, index_type,
4748 convert (index_type, size),
4749 convert (index_type, size_one_node)));
4751 /* If that overflowed, the array is too big.
4752 ??? While a size of INT_MAX+1 technically shouldn't cause
4753 an overflow (because we subtract 1), the overflow is recorded
4754 during the conversion to index_type, before the subtraction.
4755 Handling this case seems like an unnecessary complication. */
4756 if (TREE_OVERFLOW (itype))
4758 error ("size of array `%s' is too large", name);
4759 type = error_mark_node;
4764 itype = variable_size (itype);
4765 itype = build_index_type (itype);
4768 #if 0 /* This had bad results for pointers to arrays, as in
4769 union incomplete (*foo)[4]; */
4770 /* Complain about arrays of incomplete types, except in typedefs. */
4772 if (TYPE_SIZE (type) == 0
4773 /* Avoid multiple warnings for nested array types. */
4774 && TREE_CODE (type) != ARRAY_TYPE
4775 && !(specbits & (1 << (int) RID_TYPEDEF))
4776 && !C_TYPE_BEING_DEFINED (type))
4777 warning ("array type has incomplete element type");
4780 #if 0 /* We shouldn't have a function type here at all!
4781 Functions aren't allowed as array elements. */
4782 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4783 && (constp || volatilep))
4784 pedwarn ("ANSI C forbids const or volatile function types");
4787 /* Build the array type itself, then merge any constancy or
4788 volatility into the target type. We must do it in this order
4789 to ensure that the TYPE_MAIN_VARIANT field of the array type
4790 is set correctly. */
4792 type = build_array_type (type, itype);
4793 if (constp || volatilep)
4794 type = c_build_type_variant (type, constp, volatilep);
4796 #if 0 /* don't clear these; leave them set so that the array type
4797 or the variable is itself const or volatile. */
4803 C_TYPE_VARIABLE_SIZE (type) = 1;
4805 else if (TREE_CODE (declarator) == CALL_EXPR)
4807 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4808 || current_binding_level == global_binding_level);
4811 /* Declaring a function type.
4812 Make sure we have a valid type for the function to return. */
4813 if (type == error_mark_node)
4818 /* Warn about some types functions can't return. */
4820 if (TREE_CODE (type) == FUNCTION_TYPE)
4822 error ("`%s' declared as function returning a function", name);
4823 type = integer_type_node;
4825 if (TREE_CODE (type) == ARRAY_TYPE)
4827 error ("`%s' declared as function returning an array", name);
4828 type = integer_type_node;
4831 #ifndef TRADITIONAL_RETURN_FLOAT
4832 /* Traditionally, declaring return type float means double. */
4834 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4835 type = double_type_node;
4836 #endif /* TRADITIONAL_RETURN_FLOAT */
4838 /* If this is a block level extern, it must live past the end
4839 of the function so that we can check it against other extern
4840 declarations (IDENTIFIER_LIMBO_VALUE). */
4841 if (extern_ref && allocation_temporary_p ())
4842 end_temporary_allocation ();
4844 /* Construct the function type and go to the next
4845 inner layer of declarator. */
4847 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4849 /* Say it's a definition
4850 only for the CALL_EXPR
4851 closest to the identifier. */
4852 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4853 #if 0 /* This seems to be false. We turn off temporary allocation
4854 above in this function if -traditional.
4855 And this code caused inconsistent results with prototypes:
4856 callers would ignore them, and pass arguments wrong. */
4858 /* Omit the arg types if -traditional, since the arg types
4859 and the list links might not be permanent. */
4860 type = build_function_type (type,
4862 ? NULL_TREE : arg_types);
4864 /* ANSI seems to say that `const int foo ();'
4865 does not make the function foo const. */
4866 if (constp || volatilep)
4867 type = c_build_type_variant (type, constp, volatilep);
4871 type = build_function_type (type, arg_types);
4872 declarator = TREE_OPERAND (declarator, 0);
4874 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4875 the formal parameter list of this FUNCTION_TYPE to point to
4876 the FUNCTION_TYPE node itself. */
4881 for (link = current_function_parm_tags;
4883 link = TREE_CHAIN (link))
4884 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4887 else if (TREE_CODE (declarator) == INDIRECT_REF)
4889 /* Merge any constancy or volatility into the target type
4892 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4893 && (constp || volatilep))
4894 pedwarn ("ANSI C forbids const or volatile function types");
4895 if (constp || volatilep)
4896 type = c_build_type_variant (type, constp, volatilep);
4901 type = build_pointer_type (type);
4903 /* Process a list of type modifier keywords
4904 (such as const or volatile) that were given inside the `*'. */
4906 if (TREE_TYPE (declarator))
4908 register tree typemodlist;
4910 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4911 typemodlist = TREE_CHAIN (typemodlist))
4913 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4915 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4920 error ("invalid type modifier within pointer declarator");
4924 pedwarn ("duplicate `const'");
4926 pedwarn ("duplicate `volatile'");
4929 declarator = TREE_OPERAND (declarator, 0);
4936 /* Now TYPE has the actual type. */
4938 /* Did array size calculations overflow? */
4940 if (TREE_CODE (type) == ARRAY_TYPE
4942 && TREE_OVERFLOW (TYPE_SIZE (type)))
4943 error ("size of array `%s' is too large", name);
4945 /* If this is declaring a typedef name, return a TYPE_DECL. */
4947 if (specbits & (1 << (int) RID_TYPEDEF))
4950 /* Note that the grammar rejects storage classes
4951 in typenames, fields or parameters */
4952 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4953 && (constp || volatilep))
4954 pedwarn ("ANSI C forbids const or volatile function types");
4955 if (constp || volatilep)
4956 type = c_build_type_variant (type, constp, volatilep);
4957 decl = build_decl (TYPE_DECL, declarator, type);
4958 if ((specbits & (1 << (int) RID_SIGNED))
4959 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4960 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4965 /* Detect the case of an array type of unspecified size
4966 which came, as such, direct from a typedef name.
4967 We must copy the type, so that each identifier gets
4968 a distinct type, so that each identifier's size can be
4969 controlled separately by its own initializer. */
4971 if (type != 0 && typedef_type != 0
4972 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4973 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4975 type = build_array_type (TREE_TYPE (type), 0);
4977 C_TYPE_VARIABLE_SIZE (type) = 1;
4980 /* If this is a type name (such as, in a cast or sizeof),
4981 compute the type and return it now. */
4983 if (decl_context == TYPENAME)
4985 /* Note that the grammar rejects storage classes
4986 in typenames, fields or parameters */
4987 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4988 && (constp || volatilep))
4989 pedwarn ("ANSI C forbids const or volatile function types");
4990 if (constp || volatilep)
4991 type = c_build_type_variant (type, constp, volatilep);
4996 /* Aside from typedefs and type names (handle above),
4997 `void' at top level (not within pointer)
4998 is allowed only in public variables.
4999 We don't complain about parms either, but that is because
5000 a better error message can be made later. */
5002 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5003 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5004 && ((specbits & (1 << (int) RID_EXTERN))
5005 || (current_binding_level == global_binding_level
5007 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5009 error ("variable or field `%s' declared void", name);
5010 type = integer_type_node;
5013 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5014 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5019 if (decl_context == PARM)
5021 tree type_as_written = type;
5024 /* A parameter declared as an array of T is really a pointer to T.
5025 One declared as a function is really a pointer to a function. */
5027 if (TREE_CODE (type) == ARRAY_TYPE)
5029 /* Transfer const-ness of array into that of type pointed to. */
5030 type = TREE_TYPE (type);
5031 if (constp || volatilep)
5032 type = c_build_type_variant (type, constp, volatilep);
5033 type = build_pointer_type (type);
5034 volatilep = constp = 0;
5037 else if (TREE_CODE (type) == FUNCTION_TYPE)
5039 if (pedantic && (constp || volatilep))
5040 pedwarn ("ANSI C forbids const or volatile function types");
5041 if (constp || volatilep)
5042 type = c_build_type_variant (type, constp, volatilep);
5043 type = build_pointer_type (type);
5044 volatilep = constp = 0;
5047 decl = build_decl (PARM_DECL, declarator, type);
5049 C_DECL_VARIABLE_SIZE (decl) = 1;
5051 /* Compute the type actually passed in the parmlist,
5052 for the case where there is no prototype.
5053 (For example, shorts and chars are passed as ints.)
5054 When there is a prototype, this is overridden later. */
5056 DECL_ARG_TYPE (decl) = type;
5057 main_type = (type == error_mark_node
5059 : TYPE_MAIN_VARIANT (type));
5060 if (main_type == float_type_node)
5061 DECL_ARG_TYPE (decl) = double_type_node;
5062 /* Don't use TYPE_PRECISION to decide whether to promote,
5063 because we should convert short if it's the same size as int,
5064 but we should not convert long if it's the same size as int. */
5065 else if (TREE_CODE (main_type) != ERROR_MARK
5066 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5068 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5069 && TREE_UNSIGNED (type))
5070 DECL_ARG_TYPE (decl) = unsigned_type_node;
5072 DECL_ARG_TYPE (decl) = integer_type_node;
5075 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5077 else if (decl_context == FIELD)
5079 /* Structure field. It may not be a function. */
5081 if (TREE_CODE (type) == FUNCTION_TYPE)
5083 error ("field `%s' declared as a function", name);
5084 type = build_pointer_type (type);
5086 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5088 error ("field `%s' has incomplete type", name);
5089 type = error_mark_node;
5091 /* Move type qualifiers down to element of an array. */
5092 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5094 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5096 TYPE_DOMAIN (type));
5097 #if 0 /* Leave the field const or volatile as well. */
5098 constp = volatilep = 0;
5101 decl = build_decl (FIELD_DECL, declarator, type);
5103 C_DECL_VARIABLE_SIZE (decl) = 1;
5105 else if (TREE_CODE (type) == FUNCTION_TYPE)
5107 /* Every function declaration is "external"
5108 except for those which are inside a function body
5109 in which `auto' is used.
5110 That is a case not specified by ANSI C,
5111 and we use it for forward declarations for nested functions. */
5112 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5113 || current_binding_level == global_binding_level);
5115 if (specbits & (1 << (int) RID_AUTO)
5116 && (pedantic || current_binding_level == global_binding_level))
5117 pedwarn ("invalid storage class for function `%s'", name);
5118 if (specbits & (1 << (int) RID_REGISTER))
5119 error ("invalid storage class for function `%s'", name);
5120 /* Function declaration not at top level.
5121 Storage classes other than `extern' are not allowed
5122 and `extern' makes no difference. */
5123 if (current_binding_level != global_binding_level
5124 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5126 pedwarn ("invalid storage class for function `%s'", name);
5128 /* If this is a block level extern, it must live past the end
5129 of the function so that we can check it against other
5130 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5131 if (extern_ref && allocation_temporary_p ())
5132 end_temporary_allocation ();
5134 decl = build_decl (FUNCTION_DECL, declarator, type);
5135 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5137 if (pedantic && (constp || volatilep)
5138 && ! DECL_IN_SYSTEM_HEADER (decl))
5139 pedwarn ("ANSI C forbids const or volatile functions");
5142 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5143 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5144 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5145 && ! DECL_IN_SYSTEM_HEADER (decl))
5146 pedwarn ("ANSI C forbids const or volatile void function return type");
5149 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5150 warning ("`noreturn' function returns non-void value");
5153 DECL_EXTERNAL (decl) = 1;
5154 /* Record absence of global scope for `static' or `auto'. */
5156 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5158 /* Record presence of `inline', if it is reasonable. */
5161 tree last = tree_last (TYPE_ARG_TYPES (type));
5163 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5164 warning ("cannot inline function `main'");
5165 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
5167 warning ("inline declaration ignored for function with `...'");
5169 /* Assume that otherwise the function can be inlined. */
5170 DECL_INLINE (decl) = 1;
5172 if (specbits & (1 << (int) RID_EXTERN))
5173 current_extern_inline = 1;
5178 /* It's a variable. */
5179 /* An uninitialized decl with `extern' is a reference. */
5180 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5182 /* Move type qualifiers down to element of an array. */
5183 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5185 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5187 TYPE_DOMAIN (type));
5188 #if 0 /* Leave the variable const or volatile as well. */
5189 constp = volatilep = 0;
5193 /* If this is a block level extern, it must live past the end
5194 of the function so that we can check it against other
5195 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5196 if (extern_ref && allocation_temporary_p ())
5197 end_temporary_allocation ();
5199 decl = build_decl (VAR_DECL, declarator, type);
5201 C_DECL_VARIABLE_SIZE (decl) = 1;
5204 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5206 DECL_EXTERNAL (decl) = extern_ref;
5207 /* At top level, the presence of a `static' or `register' storage
5208 class specifier, or the absence of all storage class specifiers
5209 makes this declaration a definition (perhaps tentative). Also,
5210 the absence of both `static' and `register' makes it public. */
5211 if (current_binding_level == global_binding_level)
5215 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5216 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5218 /* Not at top level, only `static' makes a static definition. */
5221 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5222 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5225 if (specbits & 1 << (int) RID_ITERATOR)
5226 ITERATOR_P (decl) = 1;
5229 /* Record `register' declaration for warnings on &
5230 and in case doing stupid register allocation. */
5232 if (specbits & (1 << (int) RID_REGISTER))
5233 DECL_REGISTER (decl) = 1;
5235 /* Record constancy and volatility. */
5238 TREE_READONLY (decl) = 1;
5241 TREE_SIDE_EFFECTS (decl) = 1;
5242 TREE_THIS_VOLATILE (decl) = 1;
5244 /* If a type has volatile components, it should be stored in memory.
5245 Otherwise, the fact that those components are volatile
5246 will be ignored, and would even crash the compiler. */
5247 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5248 mark_addressable (decl);
5256 /* Decode the parameter-list info for a function type or function definition.
5257 The argument is the value returned by `get_parm_info' (or made in parse.y
5258 if there is an identifier list instead of a parameter decl list).
5259 These two functions are separate because when a function returns
5260 or receives functions then each is called multiple times but the order
5261 of calls is different. The last call to `grokparms' is always the one
5262 that contains the formal parameter names of a function definition.
5264 Store in `last_function_parms' a chain of the decls of parms.
5265 Also store in `last_function_parm_tags' a chain of the struct, union,
5266 and enum tags declared among the parms.
5268 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5270 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5271 a mere declaration. A nonempty identifier-list gets an error message
5272 when FUNCDEF_FLAG is zero. */
5275 grokparms (parms_info, funcdef_flag)
5279 tree first_parm = TREE_CHAIN (parms_info);
5281 last_function_parms = TREE_PURPOSE (parms_info);
5282 last_function_parm_tags = TREE_VALUE (parms_info);
5284 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5285 && !in_system_header)
5286 warning ("function declaration isn't a prototype");
5289 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5292 pedwarn ("parameter names (without types) in function declaration");
5294 last_function_parms = first_parm;
5301 /* We no longer test FUNCDEF_FLAG.
5302 If the arg types are incomplete in a declaration,
5303 they must include undefined tags.
5304 These tags can never be defined in the scope of the declaration,
5305 so the types can never be completed,
5306 and no call can be compiled successfully. */
5308 /* In a fcn definition, arg types must be complete. */
5311 for (parm = last_function_parms, typelt = first_parm;
5313 parm = TREE_CHAIN (parm))
5314 /* Skip over any enumeration constants declared here. */
5315 if (TREE_CODE (parm) == PARM_DECL)
5317 /* Barf if the parameter itself has an incomplete type. */
5318 tree type = TREE_VALUE (typelt);
5319 if (TYPE_SIZE (type) == 0)
5321 if (funcdef_flag && DECL_NAME (parm) != 0)
5322 error ("parameter `%s' has incomplete type",
5323 IDENTIFIER_POINTER (DECL_NAME (parm)));
5325 warning ("parameter has incomplete type");
5328 TREE_VALUE (typelt) = error_mark_node;
5329 TREE_TYPE (parm) = error_mark_node;
5332 #if 0 /* This has been replaced by parm_tags_warning
5333 which uses a more accurate criterion for what to warn about. */
5336 /* Now warn if is a pointer to an incomplete type. */
5337 while (TREE_CODE (type) == POINTER_TYPE
5338 || TREE_CODE (type) == REFERENCE_TYPE)
5339 type = TREE_TYPE (type);
5340 type = TYPE_MAIN_VARIANT (type);
5341 if (TYPE_SIZE (type) == 0)
5343 if (DECL_NAME (parm) != 0)
5344 warning ("parameter `%s' points to incomplete type",
5345 IDENTIFIER_POINTER (DECL_NAME (parm)));
5347 warning ("parameter points to incomplete type");
5351 typelt = TREE_CHAIN (typelt);
5354 /* Allocate the list of types the way we allocate a type. */
5355 if (first_parm && ! TREE_PERMANENT (first_parm))
5357 /* Construct a copy of the list of types
5358 on the saveable obstack. */
5360 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5361 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5363 return nreverse (result);
5366 /* The list we have is permanent already. */
5372 /* Return a tree_list node with info on a parameter list just parsed.
5373 The TREE_PURPOSE is a chain of decls of those parms.
5374 The TREE_VALUE is a list of structure, union and enum tags defined.
5375 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5376 This tree_list node is later fed to `grokparms'.
5378 VOID_AT_END nonzero means append `void' to the end of the type-list.
5379 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5382 get_parm_info (void_at_end)
5385 register tree decl, t;
5386 register tree types = 0;
5388 tree tags = gettags ();
5389 tree parms = getdecls ();
5391 tree order = current_binding_level->parm_order;
5393 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5394 if (void_at_end && parms != 0
5395 && TREE_CHAIN (parms) == 0
5396 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5397 && DECL_NAME (parms) == 0)
5400 storedecls (NULL_TREE);
5401 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5402 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5405 /* Extract enumerator values and other non-parms declared with the parms.
5406 Likewise any forward parm decls that didn't have real parm decls. */
5407 for (decl = parms; decl; )
5409 tree next = TREE_CHAIN (decl);
5411 if (TREE_CODE (decl) != PARM_DECL)
5413 TREE_CHAIN (decl) = new_parms;
5416 else if (TREE_ASM_WRITTEN (decl))
5418 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5419 TREE_CHAIN (decl) = new_parms;
5425 /* Put the parm decls back in the order they were in in the parm list. */
5426 for (t = order; t; t = TREE_CHAIN (t))
5429 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5431 TREE_CHAIN (TREE_VALUE (t)) = 0;
5434 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5437 /* Store the parmlist in the binding level since the old one
5438 is no longer a valid list. (We have changed the chain pointers.) */
5439 storedecls (new_parms);
5441 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5442 /* There may also be declarations for enumerators if an enumeration
5443 type is declared among the parms. Ignore them here. */
5444 if (TREE_CODE (decl) == PARM_DECL)
5446 /* Since there is a prototype,
5447 args are passed in their declared types. */
5448 tree type = TREE_TYPE (decl);
5449 DECL_ARG_TYPE (decl) = type;
5450 #ifdef PROMOTE_PROTOTYPES
5451 if ((TREE_CODE (type) == INTEGER_TYPE
5452 || TREE_CODE (type) == ENUMERAL_TYPE)
5453 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5454 DECL_ARG_TYPE (decl) = integer_type_node;
5457 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5458 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5459 && DECL_NAME (decl) == 0)
5461 error ("`void' in parameter list must be the entire list");
5467 return saveable_tree_cons (new_parms, tags,
5468 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5470 return saveable_tree_cons (new_parms, tags, nreverse (types));
5473 /* At end of parameter list, warn about any struct, union or enum tags
5474 defined within. Do so because these types cannot ever become complete. */
5477 parmlist_tags_warning ()
5482 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5484 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5485 /* An anonymous union parm type is meaningful as a GNU extension.
5486 So don't warn for that. */
5487 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5489 if (TREE_PURPOSE (elt) != 0)
5490 warning ("`%s %s' declared inside parameter list",
5491 (code == RECORD_TYPE ? "struct"
5492 : code == UNION_TYPE ? "union"
5494 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5496 warning ("anonymous %s declared inside parameter list",
5497 (code == RECORD_TYPE ? "struct"
5498 : code == UNION_TYPE ? "union"
5503 warning ("its scope is only this definition or declaration,");
5504 warning ("which is probably not what you want.");
5510 /* Get the struct, enum or union (CODE says which) with tag NAME.
5511 Define the tag as a forward-reference if it is not defined. */
5514 xref_tag (code, name)
5515 enum tree_code code;
5518 int temporary = allocation_temporary_p ();
5520 /* If a cross reference is requested, look up the type
5521 already defined for this tag and return it. */
5523 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5524 /* Even if this is the wrong type of tag, return what we found.
5525 There will be an error message anyway, from pending_xref_error.
5526 If we create an empty xref just for an invalid use of the type,
5527 the main result is to create lots of superfluous error messages. */
5531 push_obstacks_nochange ();
5533 if (current_binding_level == global_binding_level && temporary)
5534 end_temporary_allocation ();
5536 /* If no such tag is yet defined, create a forward-reference node
5537 and record it as the "definition".
5538 When a real declaration of this type is found,
5539 the forward-reference will be altered into a real type. */
5541 ref = make_node (code);
5542 if (code == ENUMERAL_TYPE)
5544 /* (In ANSI, Enums can be referred to only if already defined.) */
5546 pedwarn ("ANSI C forbids forward references to `enum' types");
5547 /* Give the type a default layout like unsigned int
5548 to avoid crashing if it does not get defined. */
5549 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5550 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5551 TREE_UNSIGNED (ref) = 1;
5552 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5553 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5554 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5557 pushtag (name, ref);
5564 /* Make sure that the tag NAME is defined *in the current binding level*
5565 at least as a forward reference.
5566 CODE says which kind of tag NAME ought to be.
5568 We also do a push_obstacks_nochange
5569 whose matching pop is in finish_struct. */
5572 start_struct (code, name)
5573 enum tree_code code;
5576 /* If there is already a tag defined at this binding level
5577 (as a forward reference), just return it. */
5579 register tree ref = 0;
5581 push_obstacks_nochange ();
5582 if (current_binding_level == global_binding_level)
5583 end_temporary_allocation ();
5586 ref = lookup_tag (code, name, current_binding_level, 1);
5587 if (ref && TREE_CODE (ref) == code)
5589 C_TYPE_BEING_DEFINED (ref) = 1;
5590 TYPE_PACKED (ref) = flag_pack_struct;
5591 if (TYPE_FIELDS (ref))
5592 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5593 : "redefinition of `struct %s'"),
5594 IDENTIFIER_POINTER (name));
5599 /* Otherwise create a forward-reference just so the tag is in scope. */
5601 ref = make_node (code);
5602 pushtag (name, ref);
5603 C_TYPE_BEING_DEFINED (ref) = 1;
5604 TYPE_PACKED (ref) = flag_pack_struct;
5608 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5609 of a structure component, returning a FIELD_DECL node.
5610 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5612 This is done during the parsing of the struct declaration.
5613 The FIELD_DECL nodes are chained together and the lot of them
5614 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5617 grokfield (filename, line, declarator, declspecs, width)
5620 tree declarator, declspecs, width;
5624 /* The corresponding pop_obstacks is in finish_decl. */
5625 push_obstacks_nochange ();
5627 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5629 finish_decl (value, NULL_TREE, NULL_TREE);
5630 DECL_INITIAL (value) = width;
5632 maybe_objc_check_decl (value);
5636 /* Function to help qsort sort FIELD_DECLs by name order. */
5639 field_decl_cmp (xp, yp)
5640 const GENERIC_PTR xp;
5641 const GENERIC_PTR yp;
5643 tree *x = (tree *)xp, *y = (tree *)yp;
5645 if (DECL_NAME (*x) == DECL_NAME (*y))
5647 if (DECL_NAME (*x) == NULL)
5649 if (DECL_NAME (*y) == NULL)
5651 if (DECL_NAME (*x) < DECL_NAME (*y))
5656 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5657 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5658 ATTRIBUTES are attributes to be applied to the structure.
5660 We also do a pop_obstacks to match the push in start_struct. */
5663 finish_struct (t, fieldlist, attributes)
5670 int toplevel = global_binding_level == current_binding_level;
5672 /* If this type was previously laid out as a forward reference,
5673 make sure we lay it out again. */
5677 decl_attributes (t, attributes, NULL_TREE);
5679 /* Nameless union parm types are useful as GCC extension. */
5680 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5681 /* Otherwise, warn about any struct or union def. in parmlist. */
5682 if (in_parm_level_p ())
5685 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5686 : "structure defined inside parms"));
5687 else if (! flag_traditional)
5688 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5689 : "structure defined inside parms"));
5692 old_momentary = suspend_momentary ();
5696 for (x = fieldlist; x; x = TREE_CHAIN (x))
5697 if (DECL_NAME (x) != 0)
5701 pedwarn ("%s has no %smembers",
5702 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5703 (fieldlist ? "named " : ""));
5706 /* Install struct as DECL_CONTEXT of each field decl.
5707 Also process specified field sizes.
5708 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5709 The specified size is found in the DECL_INITIAL.
5710 Store 0 there, except for ": 0" fields (so we can find them
5711 and delete them, below). */
5713 for (x = fieldlist; x; x = TREE_CHAIN (x))
5715 DECL_CONTEXT (x) = t;
5716 DECL_PACKED (x) |= TYPE_PACKED (t);
5717 DECL_FIELD_SIZE (x) = 0;
5719 /* If any field is const, the structure type is pseudo-const. */
5720 if (TREE_READONLY (x))
5721 C_TYPE_FIELDS_READONLY (t) = 1;
5724 /* A field that is pseudo-const makes the structure likewise. */
5725 tree t1 = TREE_TYPE (x);
5726 while (TREE_CODE (t1) == ARRAY_TYPE)
5727 t1 = TREE_TYPE (t1);
5728 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5729 && C_TYPE_FIELDS_READONLY (t1))
5730 C_TYPE_FIELDS_READONLY (t) = 1;
5733 /* Any field that is volatile means variables of this type must be
5734 treated in some ways as volatile. */
5735 if (TREE_THIS_VOLATILE (x))
5736 C_TYPE_FIELDS_VOLATILE (t) = 1;
5738 /* Any field of nominal variable size implies structure is too. */
5739 if (C_DECL_VARIABLE_SIZE (x))
5740 C_TYPE_VARIABLE_SIZE (t) = 1;
5742 /* Detect invalid nested redefinition. */
5743 if (TREE_TYPE (x) == t)
5744 error ("nested redefinition of `%s'",
5745 IDENTIFIER_POINTER (TYPE_NAME (t)));
5747 /* Detect invalid bit-field size. */
5748 if (DECL_INITIAL (x))
5749 STRIP_NOPS (DECL_INITIAL (x));
5750 if (DECL_INITIAL (x))
5752 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5753 constant_expression_warning (DECL_INITIAL (x));
5756 error_with_decl (x, "bit-field `%s' width not an integer constant");
5757 DECL_INITIAL (x) = NULL;
5761 /* Detect invalid bit-field type. */
5762 if (DECL_INITIAL (x)
5763 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5764 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5766 error_with_decl (x, "bit-field `%s' has invalid type");
5767 DECL_INITIAL (x) = NULL;
5769 if (DECL_INITIAL (x) && pedantic
5770 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5771 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5772 /* Accept an enum that's equivalent to int or unsigned int. */
5773 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5774 && (TYPE_PRECISION (TREE_TYPE (x))
5775 == TYPE_PRECISION (integer_type_node))))
5776 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5778 /* Detect and ignore out of range field width. */
5779 if (DECL_INITIAL (x))
5781 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5783 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5785 DECL_INITIAL (x) = NULL;
5786 error_with_decl (x, "negative width in bit-field `%s'");
5788 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5789 || width > TYPE_PRECISION (TREE_TYPE (x)))
5791 DECL_INITIAL (x) = NULL;
5792 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5794 else if (width == 0 && DECL_NAME (x) != 0)
5796 error_with_decl (x, "zero width for bit-field `%s'");
5797 DECL_INITIAL (x) = NULL;
5801 /* Process valid field width. */
5802 if (DECL_INITIAL (x))
5804 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5806 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5807 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5808 TREE_UNSIGNED (TREE_TYPE (x)))
5809 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5810 TREE_UNSIGNED (TREE_TYPE (x)))))
5811 warning_with_decl (x, "`%s' is narrower than values of its type");
5813 DECL_FIELD_SIZE (x) = width;
5814 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5815 DECL_INITIAL (x) = NULL;
5819 /* field size 0 => force desired amount of alignment. */
5820 #ifdef EMPTY_FIELD_BOUNDARY
5821 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5823 #ifdef PCC_BITFIELD_TYPE_MATTERS
5824 if (PCC_BITFIELD_TYPE_MATTERS)
5825 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5826 TYPE_ALIGN (TREE_TYPE (x)));
5830 else if (TREE_TYPE (x) != error_mark_node)
5832 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5833 : TYPE_ALIGN (TREE_TYPE (x)));
5834 /* Non-bit-fields are aligned for their type, except packed
5835 fields which require only BITS_PER_UNIT alignment. */
5836 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5840 /* Now DECL_INITIAL is null on all members. */
5842 /* Delete all duplicate fields from the fieldlist */
5843 for (x = fieldlist; x && TREE_CHAIN (x);)
5844 /* Anonymous fields aren't duplicates. */
5845 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5849 register tree y = fieldlist;
5853 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5859 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5861 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5862 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5864 else x = TREE_CHAIN (x);
5867 /* Now we have the nearly final fieldlist. Record it,
5868 then lay out the structure or union (including the fields). */
5870 TYPE_FIELDS (t) = fieldlist;
5874 /* Delete all zero-width bit-fields from the front of the fieldlist */
5876 && DECL_INITIAL (fieldlist))
5877 fieldlist = TREE_CHAIN (fieldlist);
5878 /* Delete all such members from the rest of the fieldlist */
5879 for (x = fieldlist; x;)
5881 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5882 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5883 else x = TREE_CHAIN (x);
5886 /* Now we have the truly final field list.
5887 Store it in this type and in the variants. */
5889 TYPE_FIELDS (t) = fieldlist;
5891 /* If there are lots of fields, sort so we can look through them fast.
5892 We arbitrarily consider 16 or more elts to be "a lot". */
5896 for (x = fieldlist; x; x = TREE_CHAIN (x))
5907 len += list_length (x);
5908 /* Use the same allocation policy here that make_node uses, to
5909 ensure that this lives as long as the rest of the struct decl.
5910 All decls in an inline function need to be saved. */
5911 if (allocation_temporary_p ())
5912 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5914 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5916 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5917 TYPE_LANG_SPECIFIC (t)->len = len;
5919 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5921 for (x = fieldlist; x; x = TREE_CHAIN (x))
5922 field_array[len++] = x;
5924 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5928 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5930 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5931 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5932 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5935 /* If this was supposed to be a transparent union, but we can't
5936 make it one, warn and turn off the flag. */
5937 if (TREE_CODE (t) == UNION_TYPE
5938 && TYPE_TRANSPARENT_UNION (t)
5939 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5941 TYPE_TRANSPARENT_UNION (t) = 0;
5942 warning ("union cannot be made transparent");
5945 /* If this structure or union completes the type of any previous
5946 variable declaration, lay it out and output its rtl. */
5948 if (current_binding_level->n_incomplete != 0)
5951 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5953 if (TREE_TYPE (decl) == t
5954 && TREE_CODE (decl) != TYPE_DECL)
5956 layout_decl (decl, 0);
5957 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5958 maybe_objc_check_decl (decl);
5959 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5962 --current_binding_level->n_incomplete;
5964 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5965 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5967 tree element = TREE_TYPE (decl);
5968 while (TREE_CODE (element) == ARRAY_TYPE)
5969 element = TREE_TYPE (element);
5971 layout_array_type (TREE_TYPE (decl));
5976 resume_momentary (old_momentary);
5978 /* Finish debugging output for this type. */
5979 rest_of_type_compilation (t, toplevel);
5981 /* The matching push is in start_struct. */
5987 /* Lay out the type T, and its element type, and so on. */
5990 layout_array_type (t)
5993 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5994 layout_array_type (TREE_TYPE (t));
5998 /* Begin compiling the definition of an enumeration type.
5999 NAME is its name (or null if anonymous).
6000 Returns the type object, as yet incomplete.
6001 Also records info about it so that build_enumerator
6002 may be used to declare the individual values as they are read. */
6008 register tree enumtype = 0;
6010 /* If this is the real definition for a previous forward reference,
6011 fill in the contents in the same object that used to be the
6012 forward reference. */
6015 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6017 /* The corresponding pop_obstacks is in finish_enum. */
6018 push_obstacks_nochange ();
6019 /* If these symbols and types are global, make them permanent. */
6020 if (current_binding_level == global_binding_level)
6021 end_temporary_allocation ();
6023 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6025 enumtype = make_node (ENUMERAL_TYPE);
6026 pushtag (name, enumtype);
6029 C_TYPE_BEING_DEFINED (enumtype) = 1;
6031 if (TYPE_VALUES (enumtype) != 0)
6033 /* This enum is a named one that has been declared already. */
6034 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6036 /* Completely replace its old definition.
6037 The old enumerators remain defined, however. */
6038 TYPE_VALUES (enumtype) = 0;
6041 enum_next_value = integer_zero_node;
6044 if (flag_short_enums)
6045 TYPE_PACKED (enumtype) = 1;
6050 /* After processing and defining all the values of an enumeration type,
6051 install their decls in the enumeration type and finish it off.
6052 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6053 and ATTRIBUTES are the specified attributes.
6054 Returns ENUMTYPE. */
6057 finish_enum (enumtype, values, attributes)
6062 register tree pair, tem;
6063 tree minnode = 0, maxnode = 0;
6064 int lowprec, highprec, precision;
6065 int toplevel = global_binding_level == current_binding_level;
6067 if (in_parm_level_p ())
6068 warning ("enum defined inside parms");
6070 decl_attributes (enumtype, attributes, NULL_TREE);
6072 /* Calculate the maximum value of any enumerator in this type. */
6074 if (values == error_mark_node)
6075 minnode = maxnode = integer_zero_node;
6077 for (pair = values; pair; pair = TREE_CHAIN (pair))
6079 tree value = TREE_VALUE (pair);
6081 minnode = maxnode = TREE_VALUE (pair);
6084 if (tree_int_cst_lt (maxnode, value))
6086 if (tree_int_cst_lt (value, minnode))
6091 TYPE_MIN_VALUE (enumtype) = minnode;
6092 TYPE_MAX_VALUE (enumtype) = maxnode;
6094 /* An enum can have some negative values; then it is signed. */
6095 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6097 /* Determine the precision this type needs. */
6099 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6100 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6101 precision = MAX (lowprec, highprec);
6103 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6105 tree narrowest = type_for_size (precision, 1);
6108 warning ("enumeration values exceed range of largest integer");
6109 narrowest = long_long_integer_type_node;
6112 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6115 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6117 TYPE_SIZE (enumtype) = 0;
6118 layout_type (enumtype);
6120 if (values != error_mark_node)
6122 /* Change the type of the enumerators to be the enum type.
6123 Formerly this was done only for enums that fit in an int,
6124 but the comment said it was done only for enums wider than int.
6125 It seems necessary to do this for wide enums,
6126 and best not to change what's done for ordinary narrower ones. */
6127 for (pair = values; pair; pair = TREE_CHAIN (pair))
6129 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6130 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6131 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6132 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6135 /* Replace the decl nodes in VALUES with their names. */
6136 for (pair = values; pair; pair = TREE_CHAIN (pair))
6137 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6139 TYPE_VALUES (enumtype) = values;
6142 /* Fix up all variant types of this enum type. */
6143 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6145 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6146 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6147 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6148 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6149 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6150 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6151 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6152 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6155 /* Finish debugging output for this type. */
6156 rest_of_type_compilation (enumtype, toplevel);
6158 /* This matches a push in start_enum. */
6164 /* Build and install a CONST_DECL for one value of the
6165 current enumeration type (one that was begun with start_enum).
6166 Return a tree-list containing the CONST_DECL and its value.
6167 Assignment of sequential values by default is handled here. */
6170 build_enumerator (name, value)
6173 register tree decl, type;
6175 /* Validate and default VALUE. */
6177 /* Remove no-op casts from the value. */
6179 STRIP_TYPE_NOPS (value);
6183 if (TREE_CODE (value) == INTEGER_CST)
6185 value = default_conversion (value);
6186 constant_expression_warning (value);
6190 error ("enumerator value for `%s' not integer constant",
6191 IDENTIFIER_POINTER (name));
6196 /* Default based on previous value. */
6197 /* It should no longer be possible to have NON_LVALUE_EXPR
6201 value = enum_next_value;
6203 error ("overflow in enumeration values");
6206 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6208 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6209 value = integer_zero_node;
6212 /* Set basis for default for next value. */
6213 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6214 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6216 /* Now create a declaration for the enum value name. */
6218 type = TREE_TYPE (value);
6219 type = type_for_size (MAX (TYPE_PRECISION (type),
6220 TYPE_PRECISION (integer_type_node)),
6222 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6223 && TREE_UNSIGNED (type)));
6225 decl = build_decl (CONST_DECL, name, type);
6226 DECL_INITIAL (decl) = value;
6227 TREE_TYPE (value) = type;
6230 return saveable_tree_cons (decl, value, NULL_TREE);
6233 /* Create the FUNCTION_DECL for a function definition.
6234 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6235 the declaration; they describe the function's name and the type it returns,
6236 but twisted together in a fashion that parallels the syntax of C.
6238 This function creates a binding context for the function body
6239 as well as setting up the FUNCTION_DECL in current_function_decl.
6241 Returns 1 on success. If the DECLARATOR is not suitable for a function
6242 (it defines a datum instead), we return 0, which tells
6243 yyparse to report a parse error.
6245 NESTED is nonzero for a function nested within another function. */
6248 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6249 tree declarator, declspecs, prefix_attributes, attributes;
6252 tree decl1, old_decl;
6254 int old_immediate_size_expand = immediate_size_expand;
6256 current_function_returns_value = 0; /* Assume, until we see it does. */
6257 current_function_returns_null = 0;
6258 warn_about_return_type = 0;
6259 current_extern_inline = 0;
6260 c_function_varargs = 0;
6262 shadowed_labels = 0;
6264 /* Don't expand any sizes in the return type of the function. */
6265 immediate_size_expand = 0;
6267 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6269 /* If the declarator is not suitable for a function definition,
6270 cause a syntax error. */
6273 immediate_size_expand = old_immediate_size_expand;
6277 decl_attributes (decl1, prefix_attributes, attributes);
6279 announce_function (decl1);
6281 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6283 error ("return-type is an incomplete type");
6284 /* Make it return void instead. */
6286 = build_function_type (void_type_node,
6287 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6290 if (warn_about_return_type)
6291 warning ("return-type defaults to `int'");
6293 /* Save the parm names or decls from this function's declarator
6294 where store_parm_decls will find them. */
6295 current_function_parms = last_function_parms;
6296 current_function_parm_tags = last_function_parm_tags;
6298 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6299 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6300 DECL_INITIAL (decl1) = error_mark_node;
6302 /* If this definition isn't a prototype and we had a prototype declaration
6303 before, copy the arg type info from that prototype.
6304 But not if what we had before was a builtin function. */
6305 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6306 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6307 && !DECL_BUILT_IN (old_decl)
6308 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6309 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6310 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6312 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6313 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6314 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6317 /* If there is no explicit declaration, look for any out-of-scope implicit
6320 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6322 /* Optionally warn of old-fashioned def with no previous prototype. */
6323 if (warn_strict_prototypes
6324 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6325 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6326 warning ("function declaration isn't a prototype");
6327 /* Optionally warn of any global def with no previous prototype. */
6328 else if (warn_missing_prototypes
6329 && TREE_PUBLIC (decl1)
6330 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6331 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6332 warning_with_decl (decl1, "no previous prototype for `%s'");
6333 /* Optionally warn of any def with no previous prototype
6334 if the function has already been used. */
6335 else if (warn_missing_prototypes
6336 && old_decl != 0 && TREE_USED (old_decl)
6337 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6338 warning_with_decl (decl1,
6339 "`%s' was used with no prototype before its definition");
6340 /* Optionally warn of any global def with no previous declaration. */
6341 else if (warn_missing_declarations
6342 && TREE_PUBLIC (decl1)
6344 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6345 warning_with_decl (decl1, "no previous declaration for `%s'");
6346 /* Optionally warn of any def with no previous declaration
6347 if the function has already been used. */
6348 else if (warn_missing_declarations
6349 && old_decl != 0 && TREE_USED (old_decl)
6350 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6351 warning_with_decl (decl1,
6352 "`%s' was used with no declaration before its definition");
6354 /* This is a definition, not a reference.
6355 So normally clear DECL_EXTERNAL.
6356 However, `extern inline' acts like a declaration
6357 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6358 DECL_EXTERNAL (decl1) = current_extern_inline;
6360 /* This function exists in static storage.
6361 (This does not mean `static' in the C sense!) */
6362 TREE_STATIC (decl1) = 1;
6364 /* A nested function is not global. */
6365 if (current_function_decl != 0)
6366 TREE_PUBLIC (decl1) = 0;
6368 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6370 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6375 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6376 != integer_type_node)
6377 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6379 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6380 args = TREE_CHAIN (args))
6382 tree type = args ? TREE_VALUE (args) : 0;
6384 if (type == void_type_node)
6391 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6392 pedwarn_with_decl (decl1,
6393 "first argument of `%s' should be `int'");
6397 if (TREE_CODE (type) != POINTER_TYPE
6398 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6399 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6401 pedwarn_with_decl (decl1,
6402 "second argument of `%s' should be `char **'");
6406 if (TREE_CODE (type) != POINTER_TYPE
6407 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6408 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6410 pedwarn_with_decl (decl1,
6411 "third argument of `%s' should probably be `char **'");
6416 /* It is intentional that this message does not mention the third
6417 argument, which is warned for only pedantically, because it's
6418 blessed by mention in an appendix of the standard. */
6419 if (argct > 0 && (argct < 2 || argct > 3))
6420 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6422 if (argct == 3 && pedantic)
6423 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6425 if (! TREE_PUBLIC (decl1))
6426 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6429 /* Record the decl so that the function name is defined.
6430 If we already have a decl for this name, and it is a FUNCTION_DECL,
6431 use the old decl. */
6433 current_function_decl = pushdecl (decl1);
6436 declare_parm_level (1);
6437 current_binding_level->subblocks_tag_transparent = 1;
6439 make_function_rtl (current_function_decl);
6441 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6442 /* Promote the value to int before returning it. */
6443 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6445 /* It retains unsignedness if traditional
6446 or if not really getting wider. */
6447 if (TREE_UNSIGNED (restype)
6448 && (flag_traditional
6449 || (TYPE_PRECISION (restype)
6450 == TYPE_PRECISION (integer_type_node))))
6451 restype = unsigned_type_node;
6453 restype = integer_type_node;
6455 DECL_RESULT (current_function_decl)
6456 = build_decl (RESULT_DECL, NULL_TREE, restype);
6459 /* Allocate further tree nodes temporarily during compilation
6460 of this function only. */
6461 temporary_allocation ();
6463 /* If this fcn was already referenced via a block-scope `extern' decl
6464 (or an implicit decl), propagate certain information about the usage. */
6465 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6466 TREE_ADDRESSABLE (current_function_decl) = 1;
6468 immediate_size_expand = old_immediate_size_expand;
6473 /* Record that this function is going to be a varargs function.
6474 This is called before store_parm_decls, which is too early
6475 to call mark_varargs directly. */
6480 c_function_varargs = 1;
6483 /* Store the parameter declarations into the current function declaration.
6484 This is called after parsing the parameter declarations, before
6485 digesting the body of the function.
6487 For an old-style definition, modify the function's type
6488 to specify at least the number of arguments. */
6493 register tree fndecl = current_function_decl;
6496 /* This is either a chain of PARM_DECLs (if a prototype was used)
6497 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6498 tree specparms = current_function_parms;
6500 /* This is a list of types declared among parms in a prototype. */
6501 tree parmtags = current_function_parm_tags;
6503 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6504 register tree parmdecls = getdecls ();
6506 /* This is a chain of any other decls that came in among the parm
6507 declarations. If a parm is declared with enum {foo, bar} x;
6508 then CONST_DECLs for foo and bar are put here. */
6511 /* Nonzero if this definition is written with a prototype. */
6514 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6516 /* This case is when the function was defined with an ANSI prototype.
6517 The parms already have decls, so we need not do anything here
6518 except record them as in effect
6519 and complain if any redundant old-style parm decls were written. */
6530 error_with_decl (fndecl,
6531 "parm types given both in parmlist and separately");
6532 /* Get rid of the erroneous decls; don't keep them on
6533 the list of parms, since they might not be PARM_DECLs. */
6534 for (decl = current_binding_level->names;
6535 decl; decl = TREE_CHAIN (decl))
6536 if (DECL_NAME (decl))
6537 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6538 for (link = current_binding_level->shadowed;
6539 link; link = TREE_CHAIN (link))
6540 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6541 current_binding_level->names = 0;
6542 current_binding_level->shadowed = 0;
6545 specparms = nreverse (specparms);
6546 for (parm = specparms; parm; parm = next)
6548 next = TREE_CHAIN (parm);
6549 if (TREE_CODE (parm) == PARM_DECL)
6551 if (DECL_NAME (parm) == 0)
6552 error_with_decl (parm, "parameter name omitted");
6553 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6555 error_with_decl (parm, "parameter `%s' declared void");
6556 /* Change the type to error_mark_node so this parameter
6557 will be ignored by assign_parms. */
6558 TREE_TYPE (parm) = error_mark_node;
6564 /* If we find an enum constant or a type tag,
6565 put it aside for the moment. */
6566 TREE_CHAIN (parm) = 0;
6567 others = chainon (others, parm);
6571 /* Get the decls in their original chain order
6572 and record in the function. */
6573 DECL_ARGUMENTS (fndecl) = getdecls ();
6576 /* If this function takes a variable number of arguments,
6577 add a phony parameter to the end of the parm list,
6578 to represent the position of the first unnamed argument. */
6579 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6582 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6583 /* Let's hope the address of the unnamed parm
6584 won't depend on its type. */
6585 TREE_TYPE (dummy) = integer_type_node;
6586 DECL_ARG_TYPE (dummy) = integer_type_node;
6587 DECL_ARGUMENTS (fndecl)
6588 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6592 /* Now pushdecl the enum constants. */
6593 for (parm = others; parm; parm = next)
6595 next = TREE_CHAIN (parm);
6596 if (DECL_NAME (parm) == 0)
6598 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6600 else if (TREE_CODE (parm) != PARM_DECL)
6604 storetags (chainon (parmtags, gettags ()));
6608 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6609 each with a parm name as the TREE_VALUE.
6611 PARMDECLS is a chain of declarations for parameters.
6612 Warning! It can also contain CONST_DECLs which are not parameters
6613 but are names of enumerators of any enum types
6614 declared among the parameters.
6616 First match each formal parameter name with its declaration.
6617 Associate decls with the names and store the decls
6618 into the TREE_PURPOSE slots. */
6620 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6621 DECL_RESULT (parm) = 0;
6623 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6625 register tree tail, found = NULL;
6627 if (TREE_VALUE (parm) == 0)
6629 error_with_decl (fndecl, "parameter name missing from parameter list");
6630 TREE_PURPOSE (parm) = 0;
6634 /* See if any of the parmdecls specifies this parm by name.
6635 Ignore any enumerator decls. */
6636 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6637 if (DECL_NAME (tail) == TREE_VALUE (parm)
6638 && TREE_CODE (tail) == PARM_DECL)
6644 /* If declaration already marked, we have a duplicate name.
6645 Complain, and don't use this decl twice. */
6646 if (found && DECL_RESULT (found) != 0)
6648 error_with_decl (found, "multiple parameters named `%s'");
6652 /* If the declaration says "void", complain and ignore it. */
6653 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6655 error_with_decl (found, "parameter `%s' declared void");
6656 TREE_TYPE (found) = integer_type_node;
6657 DECL_ARG_TYPE (found) = integer_type_node;
6658 layout_decl (found, 0);
6661 /* Traditionally, a parm declared float is actually a double. */
6662 if (found && flag_traditional
6663 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6665 TREE_TYPE (found) = double_type_node;
6666 DECL_ARG_TYPE (found) = double_type_node;
6667 layout_decl (found, 0);
6670 /* If no declaration found, default to int. */
6673 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6675 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6676 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6677 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6679 warning_with_decl (found, "type of `%s' defaults to `int'");
6683 TREE_PURPOSE (parm) = found;
6685 /* Mark this decl as "already found" -- see test, above.
6686 It is safe to use DECL_RESULT for this
6687 since it is not used in PARM_DECLs or CONST_DECLs. */
6688 DECL_RESULT (found) = error_mark_node;
6691 /* Put anything which is on the parmdecls chain and which is
6692 not a PARM_DECL onto the list NONPARMS. (The types of
6693 non-parm things which might appear on the list include
6694 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6695 any actual PARM_DECLs not matched with any names. */
6698 for (parm = parmdecls; parm; )
6700 tree next = TREE_CHAIN (parm);
6701 TREE_CHAIN (parm) = 0;
6703 if (TREE_CODE (parm) != PARM_DECL)
6704 nonparms = chainon (nonparms, parm);
6707 /* Complain about args with incomplete types. */
6708 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6710 error_with_decl (parm, "parameter `%s' has incomplete type");
6711 TREE_TYPE (parm) = error_mark_node;
6714 if (DECL_RESULT (parm) == 0)
6716 error_with_decl (parm,
6717 "declaration for parameter `%s' but no such parameter");
6718 /* Pretend the parameter was not missing.
6719 This gets us to a standard state and minimizes
6720 further error messages. */
6722 = chainon (specparms,
6723 tree_cons (parm, NULL_TREE, NULL_TREE));
6730 /* Chain the declarations together in the order of the list of names. */
6731 /* Store that chain in the function decl, replacing the list of names. */
6733 DECL_ARGUMENTS (fndecl) = 0;
6736 for (last = 0; parm; parm = TREE_CHAIN (parm))
6737 if (TREE_PURPOSE (parm))
6740 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6742 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6743 last = TREE_PURPOSE (parm);
6744 TREE_CHAIN (last) = 0;
6748 /* If there was a previous prototype,
6749 set the DECL_ARG_TYPE of each argument according to
6750 the type previously specified, and report any mismatches. */
6752 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6755 for (parm = DECL_ARGUMENTS (fndecl),
6756 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6757 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6758 != void_type_node));
6759 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6761 if (parm == 0 || type == 0
6762 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6764 error ("number of arguments doesn't match prototype");
6765 error_with_file_and_line (current_function_prototype_file,
6766 current_function_prototype_line,
6767 "prototype declaration");
6770 /* Type for passing arg must be consistent
6771 with that declared for the arg. */
6772 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6774 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6775 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6777 /* Adjust argument to match prototype. E.g. a previous
6778 `int foo(float);' prototype causes
6779 `int foo(x) float x; {...}' to be treated like
6780 `int foo(float x) {...}'. This is particularly
6781 useful for argument types like uid_t. */
6782 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6783 #ifdef PROMOTE_PROTOTYPES
6784 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6785 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6786 && TYPE_PRECISION (TREE_TYPE (parm))
6787 < TYPE_PRECISION (integer_type_node))
6788 DECL_ARG_TYPE (parm) = integer_type_node;
6792 pedwarn ("promoted argument `%s' doesn't match prototype",
6793 IDENTIFIER_POINTER (DECL_NAME (parm)));
6794 warning_with_file_and_line
6795 (current_function_prototype_file,
6796 current_function_prototype_line,
6797 "prototype declaration");
6800 /* If -traditional, allow `int' argument to match
6801 `unsigned' prototype. */
6802 else if (! (flag_traditional
6803 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6804 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6806 error ("argument `%s' doesn't match prototype",
6807 IDENTIFIER_POINTER (DECL_NAME (parm)));
6808 error_with_file_and_line (current_function_prototype_file,
6809 current_function_prototype_line,
6810 "prototype declaration");
6814 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6817 /* Otherwise, create a prototype that would match. */
6821 tree actual = 0, last = 0, type;
6823 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6825 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6828 TREE_CHAIN (last) = type;
6833 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6835 TREE_CHAIN (last) = type;
6839 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6840 of the type of this function, but we need to avoid having this
6841 affect the types of other similarly-typed functions, so we must
6842 first force the generation of an identical (but separate) type
6843 node for the relevant function type. The new node we create
6844 will be a variant of the main variant of the original function
6847 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6849 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6852 /* Now store the final chain of decls for the arguments
6853 as the decl-chain of the current lexical scope.
6854 Put the enumerators in as well, at the front so that
6855 DECL_ARGUMENTS is not modified. */
6857 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6860 /* Make sure the binding level for the top of the function body
6861 gets a BLOCK if there are any in the function.
6862 Otherwise, the dbx output is wrong. */
6864 keep_next_if_subblocks = 1;
6866 /* ??? This might be an improvement,
6867 but needs to be thought about some more. */
6869 keep_next_level_flag = 1;
6872 /* Write a record describing this function definition to the prototypes
6873 file (if requested). */
6875 gen_aux_info_record (fndecl, 1, 0, prototype);
6877 /* Initialize the RTL code for the function. */
6879 init_function_start (fndecl, input_filename, lineno);
6881 /* If this is a varargs function, inform function.c. */
6883 if (c_function_varargs)
6886 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6888 declare_function_name ();
6890 /* Set up parameters and prepare for return, for the function. */
6892 expand_function_start (fndecl, 0);
6894 /* If this function is `main', emit a call to `__main'
6895 to run global initializers, etc. */
6896 if (DECL_NAME (fndecl)
6897 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6898 && DECL_CONTEXT (fndecl) == NULL_TREE)
6899 expand_main_function ();
6902 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6903 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6904 stands for an ellipsis in the identifier list.
6906 PARMLIST is the data returned by get_parm_info for the
6907 parmlist that follows the semicolon.
6909 We return a value of the same sort that get_parm_info returns,
6910 except that it describes the combination of identifiers and parmlist. */
6913 combine_parm_decls (specparms, parmlist, void_at_end)
6914 tree specparms, parmlist;
6917 register tree fndecl = current_function_decl;
6920 tree parmdecls = TREE_PURPOSE (parmlist);
6922 /* This is a chain of any other decls that came in among the parm
6923 declarations. They were separated already by get_parm_info,
6924 so we just need to keep them separate. */
6925 tree nonparms = TREE_VALUE (parmlist);
6929 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6930 DECL_RESULT (parm) = 0;
6932 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6934 register tree tail, found = NULL;
6936 /* See if any of the parmdecls specifies this parm by name. */
6937 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6938 if (DECL_NAME (tail) == TREE_VALUE (parm))
6944 /* If declaration already marked, we have a duplicate name.
6945 Complain, and don't use this decl twice. */
6946 if (found && DECL_RESULT (found) != 0)
6948 error_with_decl (found, "multiple parameters named `%s'");
6952 /* If the declaration says "void", complain and ignore it. */
6953 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6955 error_with_decl (found, "parameter `%s' declared void");
6956 TREE_TYPE (found) = integer_type_node;
6957 DECL_ARG_TYPE (found) = integer_type_node;
6958 layout_decl (found, 0);
6961 /* Traditionally, a parm declared float is actually a double. */
6962 if (found && flag_traditional
6963 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6965 TREE_TYPE (found) = double_type_node;
6966 DECL_ARG_TYPE (found) = double_type_node;
6967 layout_decl (found, 0);
6970 /* If no declaration found, default to int. */
6973 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6975 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6976 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6977 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6978 error_with_decl (found, "type of parameter `%s' is not declared");
6982 TREE_PURPOSE (parm) = found;
6984 /* Mark this decl as "already found" -- see test, above.
6985 It is safe to use DECL_RESULT for this
6986 since it is not used in PARM_DECLs or CONST_DECLs. */
6987 DECL_RESULT (found) = error_mark_node;
6990 /* Complain about any actual PARM_DECLs not matched with any names. */
6992 for (parm = parmdecls; parm; )
6994 tree next = TREE_CHAIN (parm);
6995 TREE_CHAIN (parm) = 0;
6997 /* Complain about args with incomplete types. */
6998 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7000 error_with_decl (parm, "parameter `%s' has incomplete type");
7001 TREE_TYPE (parm) = error_mark_node;
7004 if (DECL_RESULT (parm) == 0)
7006 error_with_decl (parm,
7007 "declaration for parameter `%s' but no such parameter");
7008 /* Pretend the parameter was not missing.
7009 This gets us to a standard state and minimizes
7010 further error messages. */
7012 = chainon (specparms,
7013 tree_cons (parm, NULL_TREE, NULL_TREE));
7019 /* Chain the declarations together in the order of the list of names.
7020 At the same time, build up a list of their types, in reverse order. */
7026 for (last = 0; parm; parm = TREE_CHAIN (parm))
7027 if (TREE_PURPOSE (parm))
7030 parmdecls = TREE_PURPOSE (parm);
7032 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7033 last = TREE_PURPOSE (parm);
7034 TREE_CHAIN (last) = 0;
7036 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7041 return saveable_tree_cons (parmdecls, nonparms,
7042 nreverse (saveable_tree_cons (NULL_TREE,
7046 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7049 /* Finish up a function declaration and compile that function
7050 all the way to assembler language output. The free the storage
7051 for the function definition.
7053 This is called after parsing the body of the function definition.
7055 NESTED is nonzero if the function being finished is nested in another. */
7058 finish_function (nested)
7061 register tree fndecl = current_function_decl;
7063 /* TREE_READONLY (fndecl) = 1;
7064 This caused &foo to be of type ptr-to-const-function
7065 which then got a warning when stored in a ptr-to-function variable. */
7068 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7070 /* Must mark the RESULT_DECL as being in this function. */
7072 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7074 /* Obey `register' declarations if `setjmp' is called in this fn. */
7075 if (flag_traditional && current_function_calls_setjmp)
7077 setjmp_protect (DECL_INITIAL (fndecl));
7078 setjmp_protect_args ();
7081 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7083 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7084 != integer_type_node)
7086 /* You would expect the sense of this test to be the other way
7087 around, but if warn_main is set, we will already have warned,
7088 so this would be a duplicate. This is the warning you get
7089 in some environments even if you *don't* ask for it, because
7090 these are environments where it may be more of a problem than
7093 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7097 #ifdef DEFAULT_MAIN_RETURN
7098 /* Make it so that `main' always returns success by default. */
7099 DEFAULT_MAIN_RETURN;
7104 /* Generate rtl for function exit. */
7105 expand_function_end (input_filename, lineno, 0);
7107 /* So we can tell if jump_optimize sets it to 1. */
7110 /* Run the optimizers and output the assembler code for this function. */
7111 rest_of_compilation (fndecl);
7113 current_function_returns_null |= can_reach_end;
7115 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7116 warning ("`noreturn' function does return");
7117 else if (warn_return_type && can_reach_end
7118 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7119 /* If this function returns non-void and control can drop through,
7121 warning ("control reaches end of non-void function");
7122 /* With just -W, complain only if function returns both with
7123 and without a value. */
7124 else if (extra_warnings
7125 && current_function_returns_value && current_function_returns_null)
7126 warning ("this function may return with or without a value");
7128 /* If requested, warn about function definitions where the function will
7129 return a value (usually of some struct or union type) which itself will
7130 take up a lot of stack space. */
7132 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7134 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7138 register tree ret_type_size = TYPE_SIZE (ret_type);
7140 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7143 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7145 if (units > larger_than_size)
7146 warning_with_decl (fndecl,
7147 "size of return value of `%s' is %u bytes",
7153 /* Free all the tree nodes making up this function. */
7154 /* Switch back to allocating nodes permanently
7155 until we start another function. */
7157 permanent_allocation (1);
7159 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7161 /* Stop pointing to the local nodes about to be freed. */
7162 /* But DECL_INITIAL must remain nonzero so we know this
7163 was an actual function definition. */
7164 /* For a nested function, this is done in pop_c_function_context. */
7165 /* If rest_of_compilation set this to 0, leave it 0. */
7166 if (DECL_INITIAL (fndecl) != 0)
7167 DECL_INITIAL (fndecl) = error_mark_node;
7168 DECL_ARGUMENTS (fndecl) = 0;
7171 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7173 #ifndef ASM_OUTPUT_CONSTRUCTOR
7174 if (! flag_gnu_linker)
7175 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7178 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7180 if (DECL_STATIC_DESTRUCTOR (fndecl))
7182 #ifndef ASM_OUTPUT_DESTRUCTOR
7183 if (! flag_gnu_linker)
7184 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7187 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7192 /* Let the error reporting routines know that we're outside a
7193 function. For a nested function, this value is used in
7194 pop_c_function_context and then reset via pop_function_context. */
7195 current_function_decl = NULL;
7199 /* Save and restore the variables in this file and elsewhere
7200 that keep track of the progress of compilation of the current function.
7201 Used for nested functions. */
7205 struct c_function *next;
7207 tree shadowed_labels;
7210 int warn_about_return_type;
7212 struct binding_level *binding_level;
7215 struct c_function *c_function_chain;
7217 /* Save and reinitialize the variables
7218 used during compilation of a C function. */
7221 push_c_function_context ()
7223 struct c_function *p
7224 = (struct c_function *) xmalloc (sizeof (struct c_function));
7227 pedwarn ("ANSI C forbids nested functions");
7229 push_function_context ();
7231 p->next = c_function_chain;
7232 c_function_chain = p;
7234 p->named_labels = named_labels;
7235 p->shadowed_labels = shadowed_labels;
7236 p->returns_value = current_function_returns_value;
7237 p->returns_null = current_function_returns_null;
7238 p->warn_about_return_type = warn_about_return_type;
7239 p->extern_inline = current_extern_inline;
7240 p->binding_level = current_binding_level;
7243 /* Restore the variables used during compilation of a C function. */
7246 pop_c_function_context ()
7248 struct c_function *p = c_function_chain;
7251 /* Bring back all the labels that were shadowed. */
7252 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7253 if (DECL_NAME (TREE_VALUE (link)) != 0)
7254 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7255 = TREE_VALUE (link);
7257 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7259 /* Stop pointing to the local nodes about to be freed. */
7260 /* But DECL_INITIAL must remain nonzero so we know this
7261 was an actual function definition. */
7262 DECL_INITIAL (current_function_decl) = error_mark_node;
7263 DECL_ARGUMENTS (current_function_decl) = 0;
7266 pop_function_context ();
7268 c_function_chain = p->next;
7270 named_labels = p->named_labels;
7271 shadowed_labels = p->shadowed_labels;
7272 current_function_returns_value = p->returns_value;
7273 current_function_returns_null = p->returns_null;
7274 warn_about_return_type = p->warn_about_return_type;
7275 current_extern_inline = p->extern_inline;
7276 current_binding_level = p->binding_level;
7281 /* integrate_decl_tree calls this function, but since we don't use the
7282 DECL_LANG_SPECIFIC field, this is a no-op. */
7285 copy_lang_decl (node)