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, NULL_PTR);
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_memset", ptr_ftype_ptr_int_int,
3454 BUILT_IN_MEMSET, NULL_PTR);
3455 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3457 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3461 pedantic_lvalues = pedantic;
3463 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3464 declare_function_name ();
3466 start_identifier_warnings ();
3468 /* Prepare to check format strings against argument lists. */
3469 init_function_format_info ();
3473 incomplete_decl_finalize_hook = finish_incomplete_decl;
3476 /* Return a definition for a builtin function named NAME and whose data type
3477 is TYPE. TYPE should be a function type with argument types.
3478 FUNCTION_CODE tells later passes how to compile calls to this function.
3479 See tree.h for its possible values.
3481 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3482 the name to be called if we can't opencode the function. */
3485 builtin_function (name, type, function_code, library_name)
3488 enum built_in_function function_code;
3491 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3492 DECL_EXTERNAL (decl) = 1;
3493 TREE_PUBLIC (decl) = 1;
3494 /* If -traditional, permit redefining a builtin function any way you like.
3495 (Though really, if the program redefines these functions,
3496 it probably won't work right unless compiled with -fno-builtin.) */
3497 if (flag_traditional && name[0] != '_')
3498 DECL_BUILT_IN_NONANSI (decl) = 1;
3500 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3501 make_decl_rtl (decl, NULL_PTR, 1);
3503 if (function_code != NOT_BUILT_IN)
3505 DECL_BUILT_IN (decl) = 1;
3506 DECL_FUNCTION_CODE (decl) = function_code;
3508 /* Warn if a function in the namespace for users
3509 is used without an occasion to consider it declared. */
3510 if (name[0] != '_' || name[1] != '_')
3511 C_DECL_ANTICIPATED (decl) = 1;
3516 /* Called when a declaration is seen that contains no names to declare.
3517 If its type is a reference to a structure, union or enum inherited
3518 from a containing scope, shadow that tag name for the current scope
3519 with a forward reference.
3520 If its type defines a new named structure or union
3521 or defines an enum, it is valid but we need not do anything here.
3522 Otherwise, it is an error. */
3525 shadow_tag (declspecs)
3528 shadow_tag_warned (declspecs, 0);
3532 shadow_tag_warned (declspecs, warned)
3535 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3541 pending_invalid_xref = 0;
3543 for (link = declspecs; link; link = TREE_CHAIN (link))
3545 register tree value = TREE_VALUE (link);
3546 register enum tree_code code = TREE_CODE (value);
3548 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3549 /* Used to test also that TYPE_SIZE (value) != 0.
3550 That caused warning for `struct foo;' at top level in the file. */
3552 register tree name = lookup_tag_reverse (value);
3559 if (warned != 1 && code != ENUMERAL_TYPE)
3560 /* Empty unnamed enum OK */
3562 pedwarn ("unnamed struct/union that defines no instances");
3568 t = lookup_tag (code, name, current_binding_level, 1);
3572 t = make_node (code);
3579 if (!warned && ! in_system_header)
3581 warning ("useless keyword or type name in empty declaration");
3588 error ("two types specified in one empty declaration");
3593 pedwarn ("empty declaration");
3597 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3600 groktypename (typename)
3603 if (TREE_CODE (typename) != TREE_LIST)
3605 return grokdeclarator (TREE_VALUE (typename),
3606 TREE_PURPOSE (typename),
3610 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3613 groktypename_in_parm_context (typename)
3616 if (TREE_CODE (typename) != TREE_LIST)
3618 return grokdeclarator (TREE_VALUE (typename),
3619 TREE_PURPOSE (typename),
3623 /* Decode a declarator in an ordinary declaration or data definition.
3624 This is called as soon as the type information and variable name
3625 have been parsed, before parsing the initializer if any.
3626 Here we create the ..._DECL node, fill in its type,
3627 and put it on the list of decls for the current context.
3628 The ..._DECL node is returned as the value.
3630 Exception: for arrays where the length is not specified,
3631 the type is left null, to be filled in by `finish_decl'.
3633 Function definitions do not come here; they go to start_function
3634 instead. However, external and forward declarations of functions
3635 do go through here. Structure field declarations are done by
3636 grokfield and not through here. */
3638 /* Set this to zero to debug not using the temporary obstack
3639 to parse initializers. */
3640 int debug_temp_inits = 1;
3643 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3644 tree declarator, declspecs;
3646 tree attributes, prefix_attributes;
3648 register tree decl = grokdeclarator (declarator, declspecs,
3649 NORMAL, initialized);
3651 int init_written = initialized;
3653 /* The corresponding pop_obstacks is in finish_decl. */
3654 push_obstacks_nochange ();
3656 if (warn_main && !strcmp (IDENTIFIER_POINTER (declarator), "main"))
3657 warning_with_decl (decl, "`%s' is usually a function");
3660 /* Is it valid for this decl to have an initializer at all?
3661 If not, set INITIALIZED to zero, which will indirectly
3662 tell `finish_decl' to ignore the initializer once it is parsed. */
3663 switch (TREE_CODE (decl))
3666 /* typedef foo = bar means give foo the same type as bar.
3667 We haven't parsed bar yet, so `finish_decl' will fix that up.
3668 Any other case of an initialization in a TYPE_DECL is an error. */
3669 if (pedantic || list_length (declspecs) > 1)
3671 error ("typedef `%s' is initialized",
3672 IDENTIFIER_POINTER (DECL_NAME (decl)));
3678 error ("function `%s' is initialized like a variable",
3679 IDENTIFIER_POINTER (DECL_NAME (decl)));
3684 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3685 error ("parameter `%s' is initialized",
3686 IDENTIFIER_POINTER (DECL_NAME (decl)));
3691 /* Don't allow initializations for incomplete types
3692 except for arrays which might be completed by the initialization. */
3693 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3695 /* A complete type is ok if size is fixed. */
3697 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3698 || C_DECL_VARIABLE_SIZE (decl))
3700 error ("variable-sized object may not be initialized");
3704 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3706 error ("variable `%s' has initializer but incomplete type",
3707 IDENTIFIER_POINTER (DECL_NAME (decl)));
3710 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3712 error ("elements of array `%s' have incomplete type",
3713 IDENTIFIER_POINTER (DECL_NAME (decl)));
3720 #if 0 /* Seems redundant with grokdeclarator. */
3721 if (current_binding_level != global_binding_level
3722 && DECL_EXTERNAL (decl)
3723 && TREE_CODE (decl) != FUNCTION_DECL)
3724 warning ("declaration of `%s' has `extern' and is initialized",
3725 IDENTIFIER_POINTER (DECL_NAME (decl)));
3727 DECL_EXTERNAL (decl) = 0;
3728 if (current_binding_level == global_binding_level)
3729 TREE_STATIC (decl) = 1;
3731 /* Tell `pushdecl' this is an initialized decl
3732 even though we don't yet have the initializer expression.
3733 Also tell `finish_decl' it may store the real initializer. */
3734 DECL_INITIAL (decl) = error_mark_node;
3737 /* If this is a function declaration, write a record describing it to the
3738 prototypes file (if requested). */
3740 if (TREE_CODE (decl) == FUNCTION_DECL)
3741 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3743 /* ANSI specifies that a tentative definition which is not merged with
3744 a non-tentative definition behaves exactly like a definition with an
3745 initializer equal to zero. (Section 3.7.2)
3746 -fno-common gives strict ANSI behavior. Usually you don't want it.
3747 This matters only for variables with external linkage. */
3748 if (! flag_no_common || ! TREE_PUBLIC (decl))
3749 DECL_COMMON (decl) = 1;
3751 /* Set attributes here so if duplicate decl, will have proper attributes. */
3752 decl_attributes (decl, attributes, prefix_attributes);
3754 /* Add this decl to the current binding level.
3755 TEM may equal DECL or it may be a previous decl of the same name. */
3756 tem = pushdecl (decl);
3758 /* For a local variable, define the RTL now. */
3759 if (current_binding_level != global_binding_level
3760 /* But not if this is a duplicate decl
3761 and we preserved the rtl from the previous one
3762 (which may or may not happen). */
3763 && DECL_RTL (tem) == 0)
3765 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3767 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3768 && DECL_INITIAL (tem) != 0)
3774 /* When parsing and digesting the initializer,
3775 use temporary storage. Do this even if we will ignore the value. */
3776 if (current_binding_level == global_binding_level && debug_temp_inits)
3777 temporary_allocation ();
3783 /* Finish processing of a declaration;
3784 install its initial value.
3785 If the length of an array type is not known before,
3786 it must be determined now, from the initial value, or it is an error. */
3789 finish_decl (decl, init, asmspec_tree)
3793 register tree type = TREE_TYPE (decl);
3794 int was_incomplete = (DECL_SIZE (decl) == 0);
3795 int temporary = allocation_temporary_p ();
3798 /* If a name was specified, get the string. */
3800 asmspec = TREE_STRING_POINTER (asmspec_tree);
3802 /* If `start_decl' didn't like having an initialization, ignore it now. */
3804 if (init != 0 && DECL_INITIAL (decl) == 0)
3806 /* Don't crash if parm is initialized. */
3807 if (TREE_CODE (decl) == PARM_DECL)
3810 if (ITERATOR_P (decl))
3813 error_with_decl (decl, "iterator has no initial value");
3815 init = save_expr (init);
3820 if (TREE_CODE (decl) != TYPE_DECL)
3821 store_init_value (decl, init);
3824 /* typedef foo = bar; store the type of bar as the type of foo. */
3825 TREE_TYPE (decl) = TREE_TYPE (init);
3826 DECL_INITIAL (decl) = init = 0;
3830 /* Pop back to the obstack that is current for this binding level.
3831 This is because MAXINDEX, rtl, etc. to be made below
3832 must go in the permanent obstack. But don't discard the
3833 temporary data yet. */
3835 #if 0 /* pop_obstacks was near the end; this is what was here. */
3836 if (current_binding_level == global_binding_level && temporary)
3837 end_temporary_allocation ();
3840 /* Deduce size of array from initialization, if not already known */
3842 if (TREE_CODE (type) == ARRAY_TYPE
3843 && TYPE_DOMAIN (type) == 0
3844 && TREE_CODE (decl) != TYPE_DECL)
3847 = (TREE_STATIC (decl)
3848 /* Even if pedantic, an external linkage array
3849 may have incomplete type at first. */
3850 ? pedantic && !TREE_PUBLIC (decl)
3851 : !DECL_EXTERNAL (decl));
3853 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3855 /* Get the completed type made by complete_array_type. */
3856 type = TREE_TYPE (decl);
3859 error_with_decl (decl, "initializer fails to determine size of `%s'");
3864 error_with_decl (decl, "array size missing in `%s'");
3865 /* If a `static' var's size isn't known,
3866 make it extern as well as static, so it does not get
3868 If it is not `static', then do not mark extern;
3869 finish_incomplete_decl will give it a default size
3870 and it will get allocated. */
3871 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3872 DECL_EXTERNAL (decl) = 1;
3875 /* TYPE_MAX_VALUE is always one less than the number of elements
3876 in the array, because we start counting at zero. Therefore,
3877 warn only if the value is less than zero. */
3878 if (pedantic && TYPE_DOMAIN (type) != 0
3879 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3880 error_with_decl (decl, "zero or negative size array `%s'");
3882 layout_decl (decl, 0);
3885 if (TREE_CODE (decl) == VAR_DECL)
3887 if (DECL_SIZE (decl) == 0
3888 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3889 layout_decl (decl, 0);
3891 if (DECL_SIZE (decl) == 0
3892 && (TREE_STATIC (decl)
3894 /* A static variable with an incomplete type
3895 is an error if it is initialized.
3896 Also if it is not file scope.
3897 Otherwise, let it through, but if it is not `extern'
3898 then it may cause an error message later. */
3899 /* A duplicate_decls call could have changed an extern
3900 declaration into a file scope one. This can be detected
3901 by TREE_ASM_WRITTEN being set. */
3902 (DECL_INITIAL (decl) != 0
3903 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3905 /* An automatic variable with an incomplete type
3907 !DECL_EXTERNAL (decl)))
3909 error_with_decl (decl, "storage size of `%s' isn't known");
3910 TREE_TYPE (decl) = error_mark_node;
3913 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3914 && DECL_SIZE (decl) != 0)
3916 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3917 constant_expression_warning (DECL_SIZE (decl));
3919 error_with_decl (decl, "storage size of `%s' isn't constant");
3922 if (TREE_USED (type))
3923 TREE_USED (decl) = 1;
3926 /* If this is a function and an assembler name is specified, it isn't
3927 builtin any more. Also reset DECL_RTL so we can give it its new
3929 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3931 DECL_BUILT_IN (decl) = 0;
3932 DECL_RTL (decl) = 0;
3935 /* Output the assembler code and/or RTL code for variables and functions,
3936 unless the type is an undefined structure or union.
3937 If not, it will get done when the type is completed. */
3939 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3941 if ((flag_traditional || TREE_PERMANENT (decl))
3942 && allocation_temporary_p ())
3944 push_obstacks_nochange ();
3945 end_temporary_allocation ();
3946 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3947 maybe_objc_check_decl (decl);
3948 rest_of_decl_compilation (decl, asmspec,
3949 (DECL_CONTEXT (decl) == 0
3950 || TREE_ASM_WRITTEN (decl)),
3956 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3957 maybe_objc_check_decl (decl);
3958 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3961 if (DECL_CONTEXT (decl) != 0)
3963 /* Recompute the RTL of a local array now
3964 if it used to be an incomplete type. */
3966 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3968 /* If we used it already as memory, it must stay in memory. */
3969 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3970 /* If it's still incomplete now, no init will save it. */
3971 if (DECL_SIZE (decl) == 0)
3972 DECL_INITIAL (decl) = 0;
3975 /* Compute and store the initial value. */
3976 if (TREE_CODE (decl) != FUNCTION_DECL)
3977 expand_decl_init (decl);
3981 if (TREE_CODE (decl) == TYPE_DECL)
3983 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3984 maybe_objc_check_decl (decl);
3985 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3989 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3990 /* This test used to include TREE_PERMANENT, however, we have the same
3991 problem with initializers at the function level. Such initializers get
3992 saved until the end of the function on the momentary_obstack. */
3993 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3995 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3996 space with DECL_ARG_TYPE. */
3997 && TREE_CODE (decl) != PARM_DECL)
3999 /* We need to remember that this array HAD an initialization,
4000 but discard the actual temporary nodes,
4001 since we can't have a permanent node keep pointing to them. */
4002 /* We make an exception for inline functions, since it's
4003 normal for a local extern redeclaration of an inline function
4004 to have a copy of the top-level decl's DECL_INLINE. */
4005 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4007 /* If this is a const variable, then preserve the
4008 initializer instead of discarding it so that we can optimize
4009 references to it. */
4010 /* This test used to include TREE_STATIC, but this won't be set
4011 for function level initializers. */
4012 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4014 preserve_initializer ();
4015 /* Hack? Set the permanent bit for something that is permanent,
4016 but not on the permanent obstack, so as to convince
4017 output_constant_def to make its rtl on the permanent
4019 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4021 /* The initializer and DECL must have the same (or equivalent
4022 types), but if the initializer is a STRING_CST, its type
4023 might not be on the right obstack, so copy the type
4025 TREE_TYPE (DECL_INITIAL (decl)) = type;
4028 DECL_INITIAL (decl) = error_mark_node;
4032 /* If requested, warn about definitions of large data objects. */
4034 if (warn_larger_than
4035 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4036 && !DECL_EXTERNAL (decl))
4038 register tree decl_size = DECL_SIZE (decl);
4040 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4042 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4044 if (units > larger_than_size)
4045 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4050 /* Resume permanent allocation, if not within a function. */
4051 /* The corresponding push_obstacks_nochange is in start_decl,
4052 and in push_parm_decl and in grokfield. */
4056 /* If we have gone back from temporary to permanent allocation,
4057 actually free the temporary space that we no longer need. */
4058 if (temporary && !allocation_temporary_p ())
4059 permanent_allocation (0);
4061 /* At the end of a declaration, throw away any variable type sizes
4062 of types defined inside that declaration. There is no use
4063 computing them in the following function definition. */
4064 if (current_binding_level == global_binding_level)
4065 get_pending_sizes ();
4068 /* If DECL has a cleanup, build and return that cleanup here.
4069 This is a callback called by expand_expr. */
4072 maybe_build_cleanup (decl)
4075 /* There are no cleanups in C. */
4079 /* Given a parsed parameter declaration,
4080 decode it into a PARM_DECL and push that on the current binding level.
4081 Also, for the sake of forward parm decls,
4082 record the given order of parms in `parm_order'. */
4085 push_parm_decl (parm)
4089 int old_immediate_size_expand = immediate_size_expand;
4090 /* Don't try computing parm sizes now -- wait till fn is called. */
4091 immediate_size_expand = 0;
4093 /* The corresponding pop_obstacks is in finish_decl. */
4094 push_obstacks_nochange ();
4096 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4097 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4098 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4099 TREE_PURPOSE (TREE_VALUE (parm)));
4102 if (DECL_NAME (decl))
4105 olddecl = lookup_name (DECL_NAME (decl));
4106 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4107 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4111 decl = pushdecl (decl);
4113 immediate_size_expand = old_immediate_size_expand;
4115 current_binding_level->parm_order
4116 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4118 /* Add this decl to the current binding level. */
4119 finish_decl (decl, NULL_TREE, NULL_TREE);
4122 /* Clear the given order of parms in `parm_order'.
4123 Used at start of parm list,
4124 and also at semicolon terminating forward decls. */
4129 current_binding_level->parm_order = NULL_TREE;
4132 /* Make TYPE a complete type based on INITIAL_VALUE.
4133 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4134 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4137 complete_array_type (type, initial_value, do_default)
4142 register tree maxindex = NULL_TREE;
4147 /* Note MAXINDEX is really the maximum index,
4148 one less than the size. */
4149 if (TREE_CODE (initial_value) == STRING_CST)
4152 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4153 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4156 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4158 tree elts = CONSTRUCTOR_ELTS (initial_value);
4159 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4160 for (; elts; elts = TREE_CHAIN (elts))
4162 if (TREE_PURPOSE (elts))
4163 maxindex = TREE_PURPOSE (elts);
4165 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4167 maxindex = copy_node (maxindex);
4171 /* Make an error message unless that happened already. */
4172 if (initial_value != error_mark_node)
4175 /* Prevent further error messages. */
4176 maxindex = build_int_2 (0, 0);
4183 maxindex = build_int_2 (0, 0);
4189 TYPE_DOMAIN (type) = build_index_type (maxindex);
4190 if (!TREE_TYPE (maxindex))
4191 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4194 /* Lay out the type now that we can get the real answer. */
4201 /* Given declspecs and a declarator,
4202 determine the name and type of the object declared
4203 and construct a ..._DECL node for it.
4204 (In one case we can return a ..._TYPE node instead.
4205 For invalid input we sometimes return 0.)
4207 DECLSPECS is a chain of tree_list nodes whose value fields
4208 are the storage classes and type specifiers.
4210 DECL_CONTEXT says which syntactic context this declaration is in:
4211 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4212 FUNCDEF for a function definition. Like NORMAL but a few different
4213 error messages in each case. Return value may be zero meaning
4214 this definition is too screwy to try to parse.
4215 PARM for a parameter declaration (either within a function prototype
4216 or before a function body). Make a PARM_DECL, or return void_type_node.
4217 TYPENAME if for a typename (in a cast or sizeof).
4218 Don't make a DECL node; just return the ..._TYPE node.
4219 FIELD for a struct or union field; make a FIELD_DECL.
4220 BITFIELD for a field with specified width.
4221 INITIALIZED is 1 if the decl has an initializer.
4223 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4224 It may also be so in the PARM case, for a prototype where the
4225 argument type is specified but not the name.
4227 This function is where the complicated C meanings of `static'
4228 and `extern' are interpreted. */
4231 grokdeclarator (declarator, declspecs, decl_context, initialized)
4234 enum decl_context decl_context;
4239 tree type = NULL_TREE;
4244 int explicit_int = 0;
4245 int explicit_char = 0;
4246 int defaulted_int = 0;
4247 tree typedef_decl = 0;
4249 tree typedef_type = 0;
4250 int funcdef_flag = 0;
4251 enum tree_code innermost_code = ERROR_MARK;
4253 int size_varies = 0;
4254 tree decl_machine_attr = NULL_TREE;
4256 if (decl_context == BITFIELD)
4257 bitfield = 1, decl_context = FIELD;
4259 if (decl_context == FUNCDEF)
4260 funcdef_flag = 1, decl_context = NORMAL;
4262 push_obstacks_nochange ();
4264 if (flag_traditional && allocation_temporary_p ())
4265 end_temporary_allocation ();
4267 /* Look inside a declarator for the name being declared
4268 and get it as a string, for an error message. */
4270 register tree decl = declarator;
4274 switch (TREE_CODE (decl))
4279 innermost_code = TREE_CODE (decl);
4280 decl = TREE_OPERAND (decl, 0);
4283 case IDENTIFIER_NODE:
4284 name = IDENTIFIER_POINTER (decl);
4295 /* A function definition's declarator must have the form of
4296 a function declarator. */
4298 if (funcdef_flag && innermost_code != CALL_EXPR)
4301 /* Anything declared one level down from the top level
4302 must be one of the parameters of a function
4303 (because the body is at least two levels down). */
4305 /* If this looks like a function definition, make it one,
4306 even if it occurs where parms are expected.
4307 Then store_parm_decls will reject it and not use it as a parm. */
4308 if (decl_context == NORMAL && !funcdef_flag
4309 && current_binding_level->parm_flag)
4310 decl_context = PARM;
4312 /* Look through the decl specs and record which ones appear.
4313 Some typespecs are defined as built-in typenames.
4314 Others, the ones that are modifiers of other types,
4315 are represented by bits in SPECBITS: set the bits for
4316 the modifiers that appear. Storage class keywords are also in SPECBITS.
4318 If there is a typedef name or a type, store the type in TYPE.
4319 This includes builtin typedefs such as `int'.
4321 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4322 and did not come from a user typedef.
4324 Set LONGLONG if `long' is mentioned twice. */
4326 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4329 register tree id = TREE_VALUE (spec);
4331 if (id == ridpointers[(int) RID_INT])
4333 if (id == ridpointers[(int) RID_CHAR])
4336 if (TREE_CODE (id) == IDENTIFIER_NODE)
4337 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4339 if (ridpointers[i] == id)
4341 if (i == (int) RID_LONG && specbits & (1<<i))
4344 error ("`long long long' is too long for GCC");
4347 if (pedantic && ! in_system_header)
4348 pedwarn ("ANSI C does not support `long long'");
4352 else if (specbits & (1 << i))
4353 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4359 error ("two or more data types in declaration of `%s'", name);
4360 /* Actual typedefs come to us as TYPE_DECL nodes. */
4361 else if (TREE_CODE (id) == TYPE_DECL)
4363 type = TREE_TYPE (id);
4364 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4367 /* Built-in types come as identifiers. */
4368 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4370 register tree t = lookup_name (id);
4371 if (TREE_TYPE (t) == error_mark_node)
4373 else if (!t || TREE_CODE (t) != TYPE_DECL)
4374 error ("`%s' fails to be a typedef or built in type",
4375 IDENTIFIER_POINTER (id));
4378 type = TREE_TYPE (t);
4382 else if (TREE_CODE (id) != ERROR_MARK)
4388 typedef_type = type;
4390 size_varies = C_TYPE_VARIABLE_SIZE (type);
4392 /* No type at all: default to `int', and set DEFAULTED_INT
4393 because it was not a user-defined typedef. */
4397 if (! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4398 | (1 << (int) RID_SIGNED)
4399 | (1 << (int) RID_UNSIGNED))))
4401 /* C9x will probably require a diagnostic here.
4402 For now, issue a warning if -Wreturn-type and this is a function,
4403 or if -Wimplicit; prefer the former warning since it is more
4405 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4406 warn_about_return_type = 1;
4407 else if (warn_implicit_int)
4408 warning ("type defaults to `int' in declaration of `%s'", name);
4412 type = integer_type_node;
4415 /* Now process the modifiers that were specified
4416 and check for invalid combinations. */
4418 /* Long double is a special combination. */
4420 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4421 && TYPE_MAIN_VARIANT (type) == double_type_node)
4423 specbits &= ~ (1 << (int) RID_LONG);
4424 type = long_double_type_node;
4427 /* Check all other uses of type modifiers. */
4429 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4430 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4434 if ((specbits & 1 << (int) RID_LONG)
4435 && (specbits & 1 << (int) RID_SHORT))
4436 error ("both long and short specified for `%s'", name);
4437 else if (((specbits & 1 << (int) RID_LONG)
4438 || (specbits & 1 << (int) RID_SHORT))
4440 error ("long or short specified with char for `%s'", name);
4441 else if (((specbits & 1 << (int) RID_LONG)
4442 || (specbits & 1 << (int) RID_SHORT))
4443 && TREE_CODE (type) == REAL_TYPE)
4445 static int already = 0;
4447 error ("long or short specified with floating type for `%s'", name);
4448 if (! already && ! pedantic)
4450 error ("the only valid combination is `long double'");
4454 else if ((specbits & 1 << (int) RID_SIGNED)
4455 && (specbits & 1 << (int) RID_UNSIGNED))
4456 error ("both signed and unsigned specified for `%s'", name);
4457 else if (TREE_CODE (type) != INTEGER_TYPE)
4458 error ("long, short, signed or unsigned invalid for `%s'", name);
4462 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4464 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4466 if (flag_pedantic_errors)
4471 /* Discard the type modifiers if they are invalid. */
4474 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4475 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4480 if ((specbits & (1 << (int) RID_COMPLEX))
4481 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4483 error ("complex invalid for `%s'", name);
4484 specbits &= ~ (1 << (int) RID_COMPLEX);
4487 /* Decide whether an integer type is signed or not.
4488 Optionally treat bitfields as signed by default. */
4489 if (specbits & 1 << (int) RID_UNSIGNED
4490 /* Traditionally, all bitfields are unsigned. */
4491 || (bitfield && flag_traditional
4492 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4493 || (bitfield && ! flag_signed_bitfields
4494 && (explicit_int || defaulted_int || explicit_char
4495 /* A typedef for plain `int' without `signed'
4496 can be controlled just like plain `int'. */
4497 || ! (typedef_decl != 0
4498 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4499 && TREE_CODE (type) != ENUMERAL_TYPE
4500 && !(specbits & 1 << (int) RID_SIGNED)))
4503 type = long_long_unsigned_type_node;
4504 else if (specbits & 1 << (int) RID_LONG)
4505 type = long_unsigned_type_node;
4506 else if (specbits & 1 << (int) RID_SHORT)
4507 type = short_unsigned_type_node;
4508 else if (type == char_type_node)
4509 type = unsigned_char_type_node;
4510 else if (typedef_decl)
4511 type = unsigned_type (type);
4513 type = unsigned_type_node;
4515 else if ((specbits & 1 << (int) RID_SIGNED)
4516 && type == char_type_node)
4517 type = signed_char_type_node;
4519 type = long_long_integer_type_node;
4520 else if (specbits & 1 << (int) RID_LONG)
4521 type = long_integer_type_node;
4522 else if (specbits & 1 << (int) RID_SHORT)
4523 type = short_integer_type_node;
4525 if (specbits & 1 << (int) RID_COMPLEX)
4527 /* If we just have "complex", it is equivalent to
4528 "complex double", but if any modifiers at all are specified it is
4529 the complex form of TYPE. E.g, "complex short" is
4530 "complex short int". */
4532 if (defaulted_int && ! longlong
4533 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4534 | (1 << (int) RID_SIGNED)
4535 | (1 << (int) RID_UNSIGNED))))
4536 type = complex_double_type_node;
4537 else if (type == integer_type_node)
4538 type = complex_integer_type_node;
4539 else if (type == float_type_node)
4540 type = complex_float_type_node;
4541 else if (type == double_type_node)
4542 type = complex_double_type_node;
4543 else if (type == long_double_type_node)
4544 type = complex_long_double_type_node;
4546 type = build_complex_type (type);
4549 /* Set CONSTP if this declaration is `const', whether by
4550 explicit specification or via a typedef.
4551 Likewise for VOLATILEP. */
4553 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4554 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4555 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4557 pedwarn ("duplicate `const'");
4559 pedwarn ("duplicate `volatile'");
4560 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4561 type = TYPE_MAIN_VARIANT (type);
4563 /* Warn if two storage classes are given. Default to `auto'. */
4568 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4569 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4570 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4571 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4572 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4573 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4575 /* Warn about storage classes that are invalid for certain
4576 kinds of declarations (parameters, typenames, etc.). */
4579 error ("multiple storage classes in declaration of `%s'", name);
4580 else if (funcdef_flag
4582 & ((1 << (int) RID_REGISTER)
4583 | (1 << (int) RID_AUTO)
4584 | (1 << (int) RID_TYPEDEF))))
4586 if (specbits & 1 << (int) RID_AUTO
4587 && (pedantic || current_binding_level == global_binding_level))
4588 pedwarn ("function definition declared `auto'");
4589 if (specbits & 1 << (int) RID_REGISTER)
4590 error ("function definition declared `register'");
4591 if (specbits & 1 << (int) RID_TYPEDEF)
4592 error ("function definition declared `typedef'");
4593 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4594 | (1 << (int) RID_AUTO));
4596 else if (decl_context != NORMAL && nclasses > 0)
4598 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4602 error ((decl_context == FIELD
4603 ? "storage class specified for structure field `%s'"
4604 : (decl_context == PARM
4605 ? "storage class specified for parameter `%s'"
4606 : "storage class specified for typename")),
4608 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4609 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4610 | (1 << (int) RID_EXTERN));
4613 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4615 /* `extern' with initialization is invalid if not at top level. */
4616 if (current_binding_level == global_binding_level)
4617 warning ("`%s' initialized and declared `extern'", name);
4619 error ("`%s' has both `extern' and initializer", name);
4621 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4622 && current_binding_level != global_binding_level)
4623 error ("nested function `%s' declared `extern'", name);
4624 else if (current_binding_level == global_binding_level
4625 && specbits & (1 << (int) RID_AUTO))
4626 error ("top-level declaration of `%s' specifies `auto'", name);
4627 else if ((specbits & 1 << (int) RID_ITERATOR)
4628 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4630 error ("iterator `%s' has derived type", name);
4631 type = error_mark_node;
4633 else if ((specbits & 1 << (int) RID_ITERATOR)
4634 && TREE_CODE (type) != INTEGER_TYPE)
4636 error ("iterator `%s' has noninteger type", name);
4637 type = error_mark_node;
4641 /* Now figure out the structure of the declarator proper.
4642 Descend through it, creating more complex types, until we reach
4643 the declared identifier (or NULL_TREE, in an absolute declarator). */
4645 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4647 if (type == error_mark_node)
4649 declarator = TREE_OPERAND (declarator, 0);
4653 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4654 an INDIRECT_REF (for *...),
4655 a CALL_EXPR (for ...(...)),
4656 an identifier (for the name being declared)
4657 or a null pointer (for the place in an absolute declarator
4658 where the name was omitted).
4659 For the last two cases, we have just exited the loop.
4661 At this point, TYPE is the type of elements of an array,
4662 or for a function to return, or for a pointer to point to.
4663 After this sequence of ifs, TYPE is the type of the
4664 array or function or pointer, and DECLARATOR has had its
4665 outermost layer removed. */
4667 if (TREE_CODE (declarator) == ARRAY_REF)
4669 register tree itype = NULL_TREE;
4670 register tree size = TREE_OPERAND (declarator, 1);
4671 /* An uninitialized decl with `extern' is a reference. */
4672 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4673 /* The index is a signed object `sizetype' bits wide. */
4674 tree index_type = signed_type (sizetype);
4676 declarator = TREE_OPERAND (declarator, 0);
4678 /* Check for some types that there cannot be arrays of. */
4680 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4682 error ("declaration of `%s' as array of voids", name);
4683 type = error_mark_node;
4686 if (TREE_CODE (type) == FUNCTION_TYPE)
4688 error ("declaration of `%s' as array of functions", name);
4689 type = error_mark_node;
4692 if (size == error_mark_node)
4693 type = error_mark_node;
4695 if (type == error_mark_node)
4698 /* If this is a block level extern, it must live past the end
4699 of the function so that we can check it against other extern
4700 declarations (IDENTIFIER_LIMBO_VALUE). */
4701 if (extern_ref && allocation_temporary_p ())
4702 end_temporary_allocation ();
4704 /* If size was specified, set ITYPE to a range-type for that size.
4705 Otherwise, ITYPE remains null. finish_decl may figure it out
4706 from an initial value. */
4710 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4711 STRIP_TYPE_NOPS (size);
4713 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4714 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4716 error ("size of array `%s' has non-integer type", name);
4717 size = integer_one_node;
4720 if (pedantic && integer_zerop (size))
4721 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4723 if (TREE_CODE (size) == INTEGER_CST)
4725 constant_expression_warning (size);
4726 if (tree_int_cst_sgn (size) < 0)
4728 error ("size of array `%s' is negative", name);
4729 size = integer_one_node;
4734 /* Make sure the array size remains visibly nonconstant
4735 even if it is (eg) a const variable with known value. */
4740 if (TREE_CONSTANT (size))
4741 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4743 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4747 /* Convert size to index_type, so that if it is a variable
4748 the computations will be done in the proper mode. */
4749 itype = fold (build (MINUS_EXPR, index_type,
4750 convert (index_type, size),
4751 convert (index_type, size_one_node)));
4753 /* If that overflowed, the array is too big.
4754 ??? While a size of INT_MAX+1 technically shouldn't cause
4755 an overflow (because we subtract 1), the overflow is recorded
4756 during the conversion to index_type, before the subtraction.
4757 Handling this case seems like an unnecessary complication. */
4758 if (TREE_OVERFLOW (itype))
4760 error ("size of array `%s' is too large", name);
4761 type = error_mark_node;
4766 itype = variable_size (itype);
4767 itype = build_index_type (itype);
4770 #if 0 /* This had bad results for pointers to arrays, as in
4771 union incomplete (*foo)[4]; */
4772 /* Complain about arrays of incomplete types, except in typedefs. */
4774 if (TYPE_SIZE (type) == 0
4775 /* Avoid multiple warnings for nested array types. */
4776 && TREE_CODE (type) != ARRAY_TYPE
4777 && !(specbits & (1 << (int) RID_TYPEDEF))
4778 && !C_TYPE_BEING_DEFINED (type))
4779 warning ("array type has incomplete element type");
4782 #if 0 /* We shouldn't have a function type here at all!
4783 Functions aren't allowed as array elements. */
4784 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4785 && (constp || volatilep))
4786 pedwarn ("ANSI C forbids const or volatile function types");
4789 /* Build the array type itself, then merge any constancy or
4790 volatility into the target type. We must do it in this order
4791 to ensure that the TYPE_MAIN_VARIANT field of the array type
4792 is set correctly. */
4794 type = build_array_type (type, itype);
4795 if (constp || volatilep)
4796 type = c_build_type_variant (type, constp, volatilep);
4798 #if 0 /* don't clear these; leave them set so that the array type
4799 or the variable is itself const or volatile. */
4805 C_TYPE_VARIABLE_SIZE (type) = 1;
4807 else if (TREE_CODE (declarator) == CALL_EXPR)
4809 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4810 || current_binding_level == global_binding_level);
4813 /* Declaring a function type.
4814 Make sure we have a valid type for the function to return. */
4815 if (type == error_mark_node)
4820 /* Warn about some types functions can't return. */
4822 if (TREE_CODE (type) == FUNCTION_TYPE)
4824 error ("`%s' declared as function returning a function", name);
4825 type = integer_type_node;
4827 if (TREE_CODE (type) == ARRAY_TYPE)
4829 error ("`%s' declared as function returning an array", name);
4830 type = integer_type_node;
4833 #ifndef TRADITIONAL_RETURN_FLOAT
4834 /* Traditionally, declaring return type float means double. */
4836 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4837 type = double_type_node;
4838 #endif /* TRADITIONAL_RETURN_FLOAT */
4840 /* If this is a block level extern, it must live past the end
4841 of the function so that we can check it against other extern
4842 declarations (IDENTIFIER_LIMBO_VALUE). */
4843 if (extern_ref && allocation_temporary_p ())
4844 end_temporary_allocation ();
4846 /* Construct the function type and go to the next
4847 inner layer of declarator. */
4849 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4851 /* Say it's a definition
4852 only for the CALL_EXPR
4853 closest to the identifier. */
4854 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4855 #if 0 /* This seems to be false. We turn off temporary allocation
4856 above in this function if -traditional.
4857 And this code caused inconsistent results with prototypes:
4858 callers would ignore them, and pass arguments wrong. */
4860 /* Omit the arg types if -traditional, since the arg types
4861 and the list links might not be permanent. */
4862 type = build_function_type (type,
4864 ? NULL_TREE : arg_types);
4866 /* ANSI seems to say that `const int foo ();'
4867 does not make the function foo const. */
4868 if (constp || volatilep)
4869 type = c_build_type_variant (type, constp, volatilep);
4873 type = build_function_type (type, arg_types);
4874 declarator = TREE_OPERAND (declarator, 0);
4876 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4877 the formal parameter list of this FUNCTION_TYPE to point to
4878 the FUNCTION_TYPE node itself. */
4883 for (link = current_function_parm_tags;
4885 link = TREE_CHAIN (link))
4886 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4889 else if (TREE_CODE (declarator) == INDIRECT_REF)
4891 /* Merge any constancy or volatility into the target type
4894 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4895 && (constp || volatilep))
4896 pedwarn ("ANSI C forbids const or volatile function types");
4897 if (constp || volatilep)
4898 type = c_build_type_variant (type, constp, volatilep);
4903 type = build_pointer_type (type);
4905 /* Process a list of type modifier keywords
4906 (such as const or volatile) that were given inside the `*'. */
4908 if (TREE_TYPE (declarator))
4910 register tree typemodlist;
4912 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4913 typemodlist = TREE_CHAIN (typemodlist))
4915 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4917 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4922 error ("invalid type modifier within pointer declarator");
4926 pedwarn ("duplicate `const'");
4928 pedwarn ("duplicate `volatile'");
4931 declarator = TREE_OPERAND (declarator, 0);
4938 /* Now TYPE has the actual type. */
4940 /* Did array size calculations overflow? */
4942 if (TREE_CODE (type) == ARRAY_TYPE
4944 && TREE_OVERFLOW (TYPE_SIZE (type)))
4945 error ("size of array `%s' is too large", name);
4947 /* If this is declaring a typedef name, return a TYPE_DECL. */
4949 if (specbits & (1 << (int) RID_TYPEDEF))
4952 /* Note that the grammar rejects storage classes
4953 in typenames, fields or parameters */
4954 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4955 && (constp || volatilep))
4956 pedwarn ("ANSI C forbids const or volatile function types");
4957 if (constp || volatilep)
4958 type = c_build_type_variant (type, constp, volatilep);
4959 decl = build_decl (TYPE_DECL, declarator, type);
4960 if ((specbits & (1 << (int) RID_SIGNED))
4961 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4962 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4967 /* Detect the case of an array type of unspecified size
4968 which came, as such, direct from a typedef name.
4969 We must copy the type, so that each identifier gets
4970 a distinct type, so that each identifier's size can be
4971 controlled separately by its own initializer. */
4973 if (type != 0 && typedef_type != 0
4974 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4975 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4977 type = build_array_type (TREE_TYPE (type), 0);
4979 C_TYPE_VARIABLE_SIZE (type) = 1;
4982 /* If this is a type name (such as, in a cast or sizeof),
4983 compute the type and return it now. */
4985 if (decl_context == TYPENAME)
4987 /* Note that the grammar rejects storage classes
4988 in typenames, fields or parameters */
4989 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4990 && (constp || volatilep))
4991 pedwarn ("ANSI C forbids const or volatile function types");
4992 if (constp || volatilep)
4993 type = c_build_type_variant (type, constp, volatilep);
4998 /* Aside from typedefs and type names (handle above),
4999 `void' at top level (not within pointer)
5000 is allowed only in public variables.
5001 We don't complain about parms either, but that is because
5002 a better error message can be made later. */
5004 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5005 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5006 && ((specbits & (1 << (int) RID_EXTERN))
5007 || (current_binding_level == global_binding_level
5009 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5011 error ("variable or field `%s' declared void", name);
5012 type = integer_type_node;
5015 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5016 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5021 if (decl_context == PARM)
5023 tree type_as_written = type;
5026 /* A parameter declared as an array of T is really a pointer to T.
5027 One declared as a function is really a pointer to a function. */
5029 if (TREE_CODE (type) == ARRAY_TYPE)
5031 /* Transfer const-ness of array into that of type pointed to. */
5032 type = TREE_TYPE (type);
5033 if (constp || volatilep)
5034 type = c_build_type_variant (type, constp, volatilep);
5035 type = build_pointer_type (type);
5036 volatilep = constp = 0;
5039 else if (TREE_CODE (type) == FUNCTION_TYPE)
5041 if (pedantic && (constp || volatilep))
5042 pedwarn ("ANSI C forbids const or volatile function types");
5043 if (constp || volatilep)
5044 type = c_build_type_variant (type, constp, volatilep);
5045 type = build_pointer_type (type);
5046 volatilep = constp = 0;
5049 decl = build_decl (PARM_DECL, declarator, type);
5051 C_DECL_VARIABLE_SIZE (decl) = 1;
5053 /* Compute the type actually passed in the parmlist,
5054 for the case where there is no prototype.
5055 (For example, shorts and chars are passed as ints.)
5056 When there is a prototype, this is overridden later. */
5058 DECL_ARG_TYPE (decl) = type;
5059 main_type = (type == error_mark_node
5061 : TYPE_MAIN_VARIANT (type));
5062 if (main_type == float_type_node)
5063 DECL_ARG_TYPE (decl) = double_type_node;
5064 /* Don't use TYPE_PRECISION to decide whether to promote,
5065 because we should convert short if it's the same size as int,
5066 but we should not convert long if it's the same size as int. */
5067 else if (TREE_CODE (main_type) != ERROR_MARK
5068 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5070 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5071 && TREE_UNSIGNED (type))
5072 DECL_ARG_TYPE (decl) = unsigned_type_node;
5074 DECL_ARG_TYPE (decl) = integer_type_node;
5077 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5079 else if (decl_context == FIELD)
5081 /* Structure field. It may not be a function. */
5083 if (TREE_CODE (type) == FUNCTION_TYPE)
5085 error ("field `%s' declared as a function", name);
5086 type = build_pointer_type (type);
5088 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5090 error ("field `%s' has incomplete type", name);
5091 type = error_mark_node;
5093 /* Move type qualifiers down to element of an array. */
5094 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5096 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5098 TYPE_DOMAIN (type));
5099 #if 0 /* Leave the field const or volatile as well. */
5100 constp = volatilep = 0;
5103 decl = build_decl (FIELD_DECL, declarator, type);
5105 C_DECL_VARIABLE_SIZE (decl) = 1;
5107 else if (TREE_CODE (type) == FUNCTION_TYPE)
5109 /* Every function declaration is "external"
5110 except for those which are inside a function body
5111 in which `auto' is used.
5112 That is a case not specified by ANSI C,
5113 and we use it for forward declarations for nested functions. */
5114 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5115 || current_binding_level == global_binding_level);
5117 if (specbits & (1 << (int) RID_AUTO)
5118 && (pedantic || current_binding_level == global_binding_level))
5119 pedwarn ("invalid storage class for function `%s'", name);
5120 if (specbits & (1 << (int) RID_REGISTER))
5121 error ("invalid storage class for function `%s'", name);
5122 /* Function declaration not at top level.
5123 Storage classes other than `extern' are not allowed
5124 and `extern' makes no difference. */
5125 if (current_binding_level != global_binding_level
5126 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5128 pedwarn ("invalid storage class for function `%s'", name);
5130 /* If this is a block level extern, it must live past the end
5131 of the function so that we can check it against other
5132 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5133 if (extern_ref && allocation_temporary_p ())
5134 end_temporary_allocation ();
5136 decl = build_decl (FUNCTION_DECL, declarator, type);
5137 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5139 if (pedantic && (constp || volatilep)
5140 && ! DECL_IN_SYSTEM_HEADER (decl))
5141 pedwarn ("ANSI C forbids const or volatile functions");
5144 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5145 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5146 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5147 && ! DECL_IN_SYSTEM_HEADER (decl))
5148 pedwarn ("ANSI C forbids const or volatile void function return type");
5151 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5152 warning ("`noreturn' function returns non-void value");
5155 DECL_EXTERNAL (decl) = 1;
5156 /* Record absence of global scope for `static' or `auto'. */
5158 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5160 /* Record presence of `inline', if it is reasonable. */
5163 tree last = tree_last (TYPE_ARG_TYPES (type));
5165 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5166 warning ("cannot inline function `main'");
5167 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
5169 warning ("inline declaration ignored for function with `...'");
5171 /* Assume that otherwise the function can be inlined. */
5172 DECL_INLINE (decl) = 1;
5174 if (specbits & (1 << (int) RID_EXTERN))
5175 current_extern_inline = 1;
5180 /* It's a variable. */
5181 /* An uninitialized decl with `extern' is a reference. */
5182 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5184 /* Move type qualifiers down to element of an array. */
5185 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5187 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5189 TYPE_DOMAIN (type));
5190 #if 0 /* Leave the variable const or volatile as well. */
5191 constp = volatilep = 0;
5195 /* If this is a block level extern, it must live past the end
5196 of the function so that we can check it against other
5197 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5198 if (extern_ref && allocation_temporary_p ())
5199 end_temporary_allocation ();
5201 decl = build_decl (VAR_DECL, declarator, type);
5203 C_DECL_VARIABLE_SIZE (decl) = 1;
5206 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5208 DECL_EXTERNAL (decl) = extern_ref;
5209 /* At top level, the presence of a `static' or `register' storage
5210 class specifier, or the absence of all storage class specifiers
5211 makes this declaration a definition (perhaps tentative). Also,
5212 the absence of both `static' and `register' makes it public. */
5213 if (current_binding_level == global_binding_level)
5217 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5218 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5220 /* Not at top level, only `static' makes a static definition. */
5223 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5224 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5227 if (specbits & 1 << (int) RID_ITERATOR)
5228 ITERATOR_P (decl) = 1;
5231 /* Record `register' declaration for warnings on &
5232 and in case doing stupid register allocation. */
5234 if (specbits & (1 << (int) RID_REGISTER))
5235 DECL_REGISTER (decl) = 1;
5237 /* Record constancy and volatility. */
5240 TREE_READONLY (decl) = 1;
5243 TREE_SIDE_EFFECTS (decl) = 1;
5244 TREE_THIS_VOLATILE (decl) = 1;
5246 /* If a type has volatile components, it should be stored in memory.
5247 Otherwise, the fact that those components are volatile
5248 will be ignored, and would even crash the compiler. */
5249 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5250 mark_addressable (decl);
5258 /* Decode the parameter-list info for a function type or function definition.
5259 The argument is the value returned by `get_parm_info' (or made in parse.y
5260 if there is an identifier list instead of a parameter decl list).
5261 These two functions are separate because when a function returns
5262 or receives functions then each is called multiple times but the order
5263 of calls is different. The last call to `grokparms' is always the one
5264 that contains the formal parameter names of a function definition.
5266 Store in `last_function_parms' a chain of the decls of parms.
5267 Also store in `last_function_parm_tags' a chain of the struct, union,
5268 and enum tags declared among the parms.
5270 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5272 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5273 a mere declaration. A nonempty identifier-list gets an error message
5274 when FUNCDEF_FLAG is zero. */
5277 grokparms (parms_info, funcdef_flag)
5281 tree first_parm = TREE_CHAIN (parms_info);
5283 last_function_parms = TREE_PURPOSE (parms_info);
5284 last_function_parm_tags = TREE_VALUE (parms_info);
5286 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5287 && !in_system_header)
5288 warning ("function declaration isn't a prototype");
5291 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5294 pedwarn ("parameter names (without types) in function declaration");
5296 last_function_parms = first_parm;
5303 /* We no longer test FUNCDEF_FLAG.
5304 If the arg types are incomplete in a declaration,
5305 they must include undefined tags.
5306 These tags can never be defined in the scope of the declaration,
5307 so the types can never be completed,
5308 and no call can be compiled successfully. */
5310 /* In a fcn definition, arg types must be complete. */
5313 for (parm = last_function_parms, typelt = first_parm;
5315 parm = TREE_CHAIN (parm))
5316 /* Skip over any enumeration constants declared here. */
5317 if (TREE_CODE (parm) == PARM_DECL)
5319 /* Barf if the parameter itself has an incomplete type. */
5320 tree type = TREE_VALUE (typelt);
5321 if (TYPE_SIZE (type) == 0)
5323 if (funcdef_flag && DECL_NAME (parm) != 0)
5324 error ("parameter `%s' has incomplete type",
5325 IDENTIFIER_POINTER (DECL_NAME (parm)));
5327 warning ("parameter has incomplete type");
5330 TREE_VALUE (typelt) = error_mark_node;
5331 TREE_TYPE (parm) = error_mark_node;
5334 #if 0 /* This has been replaced by parm_tags_warning
5335 which uses a more accurate criterion for what to warn about. */
5338 /* Now warn if is a pointer to an incomplete type. */
5339 while (TREE_CODE (type) == POINTER_TYPE
5340 || TREE_CODE (type) == REFERENCE_TYPE)
5341 type = TREE_TYPE (type);
5342 type = TYPE_MAIN_VARIANT (type);
5343 if (TYPE_SIZE (type) == 0)
5345 if (DECL_NAME (parm) != 0)
5346 warning ("parameter `%s' points to incomplete type",
5347 IDENTIFIER_POINTER (DECL_NAME (parm)));
5349 warning ("parameter points to incomplete type");
5353 typelt = TREE_CHAIN (typelt);
5356 /* Allocate the list of types the way we allocate a type. */
5357 if (first_parm && ! TREE_PERMANENT (first_parm))
5359 /* Construct a copy of the list of types
5360 on the saveable obstack. */
5362 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5363 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5365 return nreverse (result);
5368 /* The list we have is permanent already. */
5374 /* Return a tree_list node with info on a parameter list just parsed.
5375 The TREE_PURPOSE is a chain of decls of those parms.
5376 The TREE_VALUE is a list of structure, union and enum tags defined.
5377 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5378 This tree_list node is later fed to `grokparms'.
5380 VOID_AT_END nonzero means append `void' to the end of the type-list.
5381 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5384 get_parm_info (void_at_end)
5387 register tree decl, t;
5388 register tree types = 0;
5390 tree tags = gettags ();
5391 tree parms = getdecls ();
5393 tree order = current_binding_level->parm_order;
5395 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5396 if (void_at_end && parms != 0
5397 && TREE_CHAIN (parms) == 0
5398 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5399 && DECL_NAME (parms) == 0)
5402 storedecls (NULL_TREE);
5403 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5404 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5407 /* Extract enumerator values and other non-parms declared with the parms.
5408 Likewise any forward parm decls that didn't have real parm decls. */
5409 for (decl = parms; decl; )
5411 tree next = TREE_CHAIN (decl);
5413 if (TREE_CODE (decl) != PARM_DECL)
5415 TREE_CHAIN (decl) = new_parms;
5418 else if (TREE_ASM_WRITTEN (decl))
5420 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5421 TREE_CHAIN (decl) = new_parms;
5427 /* Put the parm decls back in the order they were in in the parm list. */
5428 for (t = order; t; t = TREE_CHAIN (t))
5431 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5433 TREE_CHAIN (TREE_VALUE (t)) = 0;
5436 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5439 /* Store the parmlist in the binding level since the old one
5440 is no longer a valid list. (We have changed the chain pointers.) */
5441 storedecls (new_parms);
5443 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5444 /* There may also be declarations for enumerators if an enumeration
5445 type is declared among the parms. Ignore them here. */
5446 if (TREE_CODE (decl) == PARM_DECL)
5448 /* Since there is a prototype,
5449 args are passed in their declared types. */
5450 tree type = TREE_TYPE (decl);
5451 DECL_ARG_TYPE (decl) = type;
5452 #ifdef PROMOTE_PROTOTYPES
5453 if ((TREE_CODE (type) == INTEGER_TYPE
5454 || TREE_CODE (type) == ENUMERAL_TYPE)
5455 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5456 DECL_ARG_TYPE (decl) = integer_type_node;
5459 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5460 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5461 && DECL_NAME (decl) == 0)
5463 error ("`void' in parameter list must be the entire list");
5469 return saveable_tree_cons (new_parms, tags,
5470 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5472 return saveable_tree_cons (new_parms, tags, nreverse (types));
5475 /* At end of parameter list, warn about any struct, union or enum tags
5476 defined within. Do so because these types cannot ever become complete. */
5479 parmlist_tags_warning ()
5484 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5486 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5487 /* An anonymous union parm type is meaningful as a GNU extension.
5488 So don't warn for that. */
5489 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5491 if (TREE_PURPOSE (elt) != 0)
5492 warning ("`%s %s' declared inside parameter list",
5493 (code == RECORD_TYPE ? "struct"
5494 : code == UNION_TYPE ? "union"
5496 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5498 warning ("anonymous %s declared inside parameter list",
5499 (code == RECORD_TYPE ? "struct"
5500 : code == UNION_TYPE ? "union"
5505 warning ("its scope is only this definition or declaration,");
5506 warning ("which is probably not what you want.");
5512 /* Get the struct, enum or union (CODE says which) with tag NAME.
5513 Define the tag as a forward-reference if it is not defined. */
5516 xref_tag (code, name)
5517 enum tree_code code;
5520 int temporary = allocation_temporary_p ();
5522 /* If a cross reference is requested, look up the type
5523 already defined for this tag and return it. */
5525 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5526 /* Even if this is the wrong type of tag, return what we found.
5527 There will be an error message anyway, from pending_xref_error.
5528 If we create an empty xref just for an invalid use of the type,
5529 the main result is to create lots of superfluous error messages. */
5533 push_obstacks_nochange ();
5535 if (current_binding_level == global_binding_level && temporary)
5536 end_temporary_allocation ();
5538 /* If no such tag is yet defined, create a forward-reference node
5539 and record it as the "definition".
5540 When a real declaration of this type is found,
5541 the forward-reference will be altered into a real type. */
5543 ref = make_node (code);
5544 if (code == ENUMERAL_TYPE)
5546 /* (In ANSI, Enums can be referred to only if already defined.) */
5548 pedwarn ("ANSI C forbids forward references to `enum' types");
5549 /* Give the type a default layout like unsigned int
5550 to avoid crashing if it does not get defined. */
5551 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5552 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5553 TREE_UNSIGNED (ref) = 1;
5554 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5555 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5556 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5559 pushtag (name, ref);
5566 /* Make sure that the tag NAME is defined *in the current binding level*
5567 at least as a forward reference.
5568 CODE says which kind of tag NAME ought to be.
5570 We also do a push_obstacks_nochange
5571 whose matching pop is in finish_struct. */
5574 start_struct (code, name)
5575 enum tree_code code;
5578 /* If there is already a tag defined at this binding level
5579 (as a forward reference), just return it. */
5581 register tree ref = 0;
5583 push_obstacks_nochange ();
5584 if (current_binding_level == global_binding_level)
5585 end_temporary_allocation ();
5588 ref = lookup_tag (code, name, current_binding_level, 1);
5589 if (ref && TREE_CODE (ref) == code)
5591 C_TYPE_BEING_DEFINED (ref) = 1;
5592 TYPE_PACKED (ref) = flag_pack_struct;
5593 if (TYPE_FIELDS (ref))
5594 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5595 : "redefinition of `struct %s'"),
5596 IDENTIFIER_POINTER (name));
5601 /* Otherwise create a forward-reference just so the tag is in scope. */
5603 ref = make_node (code);
5604 pushtag (name, ref);
5605 C_TYPE_BEING_DEFINED (ref) = 1;
5606 TYPE_PACKED (ref) = flag_pack_struct;
5610 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5611 of a structure component, returning a FIELD_DECL node.
5612 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5614 This is done during the parsing of the struct declaration.
5615 The FIELD_DECL nodes are chained together and the lot of them
5616 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5619 grokfield (filename, line, declarator, declspecs, width)
5622 tree declarator, declspecs, width;
5626 /* The corresponding pop_obstacks is in finish_decl. */
5627 push_obstacks_nochange ();
5629 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5631 finish_decl (value, NULL_TREE, NULL_TREE);
5632 DECL_INITIAL (value) = width;
5634 maybe_objc_check_decl (value);
5638 /* Function to help qsort sort FIELD_DECLs by name order. */
5641 field_decl_cmp (xp, yp)
5642 const GENERIC_PTR xp;
5643 const GENERIC_PTR yp;
5645 tree *x = (tree *)xp, *y = (tree *)yp;
5647 if (DECL_NAME (*x) == DECL_NAME (*y))
5649 if (DECL_NAME (*x) == NULL)
5651 if (DECL_NAME (*y) == NULL)
5653 if (DECL_NAME (*x) < DECL_NAME (*y))
5658 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5659 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5660 ATTRIBUTES are attributes to be applied to the structure.
5662 We also do a pop_obstacks to match the push in start_struct. */
5665 finish_struct (t, fieldlist, attributes)
5672 int toplevel = global_binding_level == current_binding_level;
5674 /* If this type was previously laid out as a forward reference,
5675 make sure we lay it out again. */
5679 decl_attributes (t, attributes, NULL_TREE);
5681 /* Nameless union parm types are useful as GCC extension. */
5682 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5683 /* Otherwise, warn about any struct or union def. in parmlist. */
5684 if (in_parm_level_p ())
5687 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5688 : "structure defined inside parms"));
5689 else if (! flag_traditional)
5690 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5691 : "structure defined inside parms"));
5694 old_momentary = suspend_momentary ();
5698 for (x = fieldlist; x; x = TREE_CHAIN (x))
5699 if (DECL_NAME (x) != 0)
5703 pedwarn ("%s has no %smembers",
5704 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5705 (fieldlist ? "named " : ""));
5708 /* Install struct as DECL_CONTEXT of each field decl.
5709 Also process specified field sizes.
5710 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5711 The specified size is found in the DECL_INITIAL.
5712 Store 0 there, except for ": 0" fields (so we can find them
5713 and delete them, below). */
5715 for (x = fieldlist; x; x = TREE_CHAIN (x))
5717 DECL_CONTEXT (x) = t;
5718 DECL_PACKED (x) |= TYPE_PACKED (t);
5719 DECL_FIELD_SIZE (x) = 0;
5721 /* If any field is const, the structure type is pseudo-const. */
5722 if (TREE_READONLY (x))
5723 C_TYPE_FIELDS_READONLY (t) = 1;
5726 /* A field that is pseudo-const makes the structure likewise. */
5727 tree t1 = TREE_TYPE (x);
5728 while (TREE_CODE (t1) == ARRAY_TYPE)
5729 t1 = TREE_TYPE (t1);
5730 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5731 && C_TYPE_FIELDS_READONLY (t1))
5732 C_TYPE_FIELDS_READONLY (t) = 1;
5735 /* Any field that is volatile means variables of this type must be
5736 treated in some ways as volatile. */
5737 if (TREE_THIS_VOLATILE (x))
5738 C_TYPE_FIELDS_VOLATILE (t) = 1;
5740 /* Any field of nominal variable size implies structure is too. */
5741 if (C_DECL_VARIABLE_SIZE (x))
5742 C_TYPE_VARIABLE_SIZE (t) = 1;
5744 /* Detect invalid nested redefinition. */
5745 if (TREE_TYPE (x) == t)
5746 error ("nested redefinition of `%s'",
5747 IDENTIFIER_POINTER (TYPE_NAME (t)));
5749 /* Detect invalid bit-field size. */
5750 if (DECL_INITIAL (x))
5751 STRIP_NOPS (DECL_INITIAL (x));
5752 if (DECL_INITIAL (x))
5754 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5755 constant_expression_warning (DECL_INITIAL (x));
5758 error_with_decl (x, "bit-field `%s' width not an integer constant");
5759 DECL_INITIAL (x) = NULL;
5763 /* Detect invalid bit-field type. */
5764 if (DECL_INITIAL (x)
5765 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5766 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5768 error_with_decl (x, "bit-field `%s' has invalid type");
5769 DECL_INITIAL (x) = NULL;
5771 if (DECL_INITIAL (x) && pedantic
5772 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5773 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5774 /* Accept an enum that's equivalent to int or unsigned int. */
5775 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5776 && (TYPE_PRECISION (TREE_TYPE (x))
5777 == TYPE_PRECISION (integer_type_node))))
5778 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5780 /* Detect and ignore out of range field width. */
5781 if (DECL_INITIAL (x))
5783 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5785 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5787 DECL_INITIAL (x) = NULL;
5788 error_with_decl (x, "negative width in bit-field `%s'");
5790 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5791 || width > TYPE_PRECISION (TREE_TYPE (x)))
5793 DECL_INITIAL (x) = NULL;
5794 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5796 else if (width == 0 && DECL_NAME (x) != 0)
5798 error_with_decl (x, "zero width for bit-field `%s'");
5799 DECL_INITIAL (x) = NULL;
5803 /* Process valid field width. */
5804 if (DECL_INITIAL (x))
5806 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5808 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5809 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5810 TREE_UNSIGNED (TREE_TYPE (x)))
5811 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5812 TREE_UNSIGNED (TREE_TYPE (x)))))
5813 warning_with_decl (x, "`%s' is narrower than values of its type");
5815 DECL_FIELD_SIZE (x) = width;
5816 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5817 DECL_INITIAL (x) = NULL;
5821 /* field size 0 => force desired amount of alignment. */
5822 #ifdef EMPTY_FIELD_BOUNDARY
5823 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5825 #ifdef PCC_BITFIELD_TYPE_MATTERS
5826 if (PCC_BITFIELD_TYPE_MATTERS)
5827 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5828 TYPE_ALIGN (TREE_TYPE (x)));
5832 else if (TREE_TYPE (x) != error_mark_node)
5834 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5835 : TYPE_ALIGN (TREE_TYPE (x)));
5836 /* Non-bit-fields are aligned for their type, except packed
5837 fields which require only BITS_PER_UNIT alignment. */
5838 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5842 /* Now DECL_INITIAL is null on all members. */
5844 /* Delete all duplicate fields from the fieldlist */
5845 for (x = fieldlist; x && TREE_CHAIN (x);)
5846 /* Anonymous fields aren't duplicates. */
5847 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5851 register tree y = fieldlist;
5855 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5861 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5863 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5864 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5866 else x = TREE_CHAIN (x);
5869 /* Now we have the nearly final fieldlist. Record it,
5870 then lay out the structure or union (including the fields). */
5872 TYPE_FIELDS (t) = fieldlist;
5876 /* Delete all zero-width bit-fields from the front of the fieldlist */
5878 && DECL_INITIAL (fieldlist))
5879 fieldlist = TREE_CHAIN (fieldlist);
5880 /* Delete all such members from the rest of the fieldlist */
5881 for (x = fieldlist; x;)
5883 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5884 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5885 else x = TREE_CHAIN (x);
5888 /* Now we have the truly final field list.
5889 Store it in this type and in the variants. */
5891 TYPE_FIELDS (t) = fieldlist;
5893 /* If there are lots of fields, sort so we can look through them fast.
5894 We arbitrarily consider 16 or more elts to be "a lot". */
5898 for (x = fieldlist; x; x = TREE_CHAIN (x))
5909 len += list_length (x);
5910 /* Use the same allocation policy here that make_node uses, to
5911 ensure that this lives as long as the rest of the struct decl.
5912 All decls in an inline function need to be saved. */
5913 if (allocation_temporary_p ())
5914 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5916 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5918 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5919 TYPE_LANG_SPECIFIC (t)->len = len;
5921 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5923 for (x = fieldlist; x; x = TREE_CHAIN (x))
5924 field_array[len++] = x;
5926 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5930 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5932 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5933 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5934 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5937 /* If this was supposed to be a transparent union, but we can't
5938 make it one, warn and turn off the flag. */
5939 if (TREE_CODE (t) == UNION_TYPE
5940 && TYPE_TRANSPARENT_UNION (t)
5941 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5943 TYPE_TRANSPARENT_UNION (t) = 0;
5944 warning ("union cannot be made transparent");
5947 /* If this structure or union completes the type of any previous
5948 variable declaration, lay it out and output its rtl. */
5950 if (current_binding_level->n_incomplete != 0)
5953 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5955 if (TREE_TYPE (decl) == t
5956 && TREE_CODE (decl) != TYPE_DECL)
5958 layout_decl (decl, 0);
5959 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5960 maybe_objc_check_decl (decl);
5961 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5964 --current_binding_level->n_incomplete;
5966 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5967 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5969 tree element = TREE_TYPE (decl);
5970 while (TREE_CODE (element) == ARRAY_TYPE)
5971 element = TREE_TYPE (element);
5973 layout_array_type (TREE_TYPE (decl));
5978 resume_momentary (old_momentary);
5980 /* Finish debugging output for this type. */
5981 rest_of_type_compilation (t, toplevel);
5983 /* The matching push is in start_struct. */
5989 /* Lay out the type T, and its element type, and so on. */
5992 layout_array_type (t)
5995 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5996 layout_array_type (TREE_TYPE (t));
6000 /* Begin compiling the definition of an enumeration type.
6001 NAME is its name (or null if anonymous).
6002 Returns the type object, as yet incomplete.
6003 Also records info about it so that build_enumerator
6004 may be used to declare the individual values as they are read. */
6010 register tree enumtype = 0;
6012 /* If this is the real definition for a previous forward reference,
6013 fill in the contents in the same object that used to be the
6014 forward reference. */
6017 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6019 /* The corresponding pop_obstacks is in finish_enum. */
6020 push_obstacks_nochange ();
6021 /* If these symbols and types are global, make them permanent. */
6022 if (current_binding_level == global_binding_level)
6023 end_temporary_allocation ();
6025 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6027 enumtype = make_node (ENUMERAL_TYPE);
6028 pushtag (name, enumtype);
6031 C_TYPE_BEING_DEFINED (enumtype) = 1;
6033 if (TYPE_VALUES (enumtype) != 0)
6035 /* This enum is a named one that has been declared already. */
6036 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6038 /* Completely replace its old definition.
6039 The old enumerators remain defined, however. */
6040 TYPE_VALUES (enumtype) = 0;
6043 enum_next_value = integer_zero_node;
6046 if (flag_short_enums)
6047 TYPE_PACKED (enumtype) = 1;
6052 /* After processing and defining all the values of an enumeration type,
6053 install their decls in the enumeration type and finish it off.
6054 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6055 and ATTRIBUTES are the specified attributes.
6056 Returns ENUMTYPE. */
6059 finish_enum (enumtype, values, attributes)
6064 register tree pair, tem;
6065 tree minnode = 0, maxnode = 0;
6066 int lowprec, highprec, precision;
6067 int toplevel = global_binding_level == current_binding_level;
6069 if (in_parm_level_p ())
6070 warning ("enum defined inside parms");
6072 decl_attributes (enumtype, attributes, NULL_TREE);
6074 /* Calculate the maximum value of any enumerator in this type. */
6076 if (values == error_mark_node)
6077 minnode = maxnode = integer_zero_node;
6079 for (pair = values; pair; pair = TREE_CHAIN (pair))
6081 tree value = TREE_VALUE (pair);
6083 minnode = maxnode = TREE_VALUE (pair);
6086 if (tree_int_cst_lt (maxnode, value))
6088 if (tree_int_cst_lt (value, minnode))
6093 TYPE_MIN_VALUE (enumtype) = minnode;
6094 TYPE_MAX_VALUE (enumtype) = maxnode;
6096 /* An enum can have some negative values; then it is signed. */
6097 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6099 /* Determine the precision this type needs. */
6101 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6102 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6103 precision = MAX (lowprec, highprec);
6105 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6107 tree narrowest = type_for_size (precision, 1);
6110 warning ("enumeration values exceed range of largest integer");
6111 narrowest = long_long_integer_type_node;
6114 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6117 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6119 TYPE_SIZE (enumtype) = 0;
6120 layout_type (enumtype);
6122 if (values != error_mark_node)
6124 /* Change the type of the enumerators to be the enum type.
6125 Formerly this was done only for enums that fit in an int,
6126 but the comment said it was done only for enums wider than int.
6127 It seems necessary to do this for wide enums,
6128 and best not to change what's done for ordinary narrower ones. */
6129 for (pair = values; pair; pair = TREE_CHAIN (pair))
6131 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6132 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6133 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6134 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6137 /* Replace the decl nodes in VALUES with their names. */
6138 for (pair = values; pair; pair = TREE_CHAIN (pair))
6139 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6141 TYPE_VALUES (enumtype) = values;
6144 /* Fix up all variant types of this enum type. */
6145 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6147 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6148 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6149 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6150 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6151 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6152 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6153 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6154 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6157 /* Finish debugging output for this type. */
6158 rest_of_type_compilation (enumtype, toplevel);
6160 /* This matches a push in start_enum. */
6166 /* Build and install a CONST_DECL for one value of the
6167 current enumeration type (one that was begun with start_enum).
6168 Return a tree-list containing the CONST_DECL and its value.
6169 Assignment of sequential values by default is handled here. */
6172 build_enumerator (name, value)
6175 register tree decl, type;
6177 /* Validate and default VALUE. */
6179 /* Remove no-op casts from the value. */
6181 STRIP_TYPE_NOPS (value);
6185 if (TREE_CODE (value) == INTEGER_CST)
6187 value = default_conversion (value);
6188 constant_expression_warning (value);
6192 error ("enumerator value for `%s' not integer constant",
6193 IDENTIFIER_POINTER (name));
6198 /* Default based on previous value. */
6199 /* It should no longer be possible to have NON_LVALUE_EXPR
6203 value = enum_next_value;
6205 error ("overflow in enumeration values");
6208 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6210 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6211 value = integer_zero_node;
6214 /* Set basis for default for next value. */
6215 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6216 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6218 /* Now create a declaration for the enum value name. */
6220 type = TREE_TYPE (value);
6221 type = type_for_size (MAX (TYPE_PRECISION (type),
6222 TYPE_PRECISION (integer_type_node)),
6224 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6225 && TREE_UNSIGNED (type)));
6227 decl = build_decl (CONST_DECL, name, type);
6228 DECL_INITIAL (decl) = value;
6229 TREE_TYPE (value) = type;
6232 return saveable_tree_cons (decl, value, NULL_TREE);
6235 /* Create the FUNCTION_DECL for a function definition.
6236 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6237 the declaration; they describe the function's name and the type it returns,
6238 but twisted together in a fashion that parallels the syntax of C.
6240 This function creates a binding context for the function body
6241 as well as setting up the FUNCTION_DECL in current_function_decl.
6243 Returns 1 on success. If the DECLARATOR is not suitable for a function
6244 (it defines a datum instead), we return 0, which tells
6245 yyparse to report a parse error.
6247 NESTED is nonzero for a function nested within another function. */
6250 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6251 tree declarator, declspecs, prefix_attributes, attributes;
6254 tree decl1, old_decl;
6256 int old_immediate_size_expand = immediate_size_expand;
6258 current_function_returns_value = 0; /* Assume, until we see it does. */
6259 current_function_returns_null = 0;
6260 warn_about_return_type = 0;
6261 current_extern_inline = 0;
6262 c_function_varargs = 0;
6264 shadowed_labels = 0;
6266 /* Don't expand any sizes in the return type of the function. */
6267 immediate_size_expand = 0;
6269 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6271 /* If the declarator is not suitable for a function definition,
6272 cause a syntax error. */
6275 immediate_size_expand = old_immediate_size_expand;
6279 decl_attributes (decl1, prefix_attributes, attributes);
6281 announce_function (decl1);
6283 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6285 error ("return-type is an incomplete type");
6286 /* Make it return void instead. */
6288 = build_function_type (void_type_node,
6289 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6292 if (warn_about_return_type)
6293 warning ("return-type defaults to `int'");
6295 /* Save the parm names or decls from this function's declarator
6296 where store_parm_decls will find them. */
6297 current_function_parms = last_function_parms;
6298 current_function_parm_tags = last_function_parm_tags;
6300 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6301 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6302 DECL_INITIAL (decl1) = error_mark_node;
6304 /* If this definition isn't a prototype and we had a prototype declaration
6305 before, copy the arg type info from that prototype.
6306 But not if what we had before was a builtin function. */
6307 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6308 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6309 && !DECL_BUILT_IN (old_decl)
6310 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6311 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6312 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6314 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6315 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6316 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6319 /* If there is no explicit declaration, look for any out-of-scope implicit
6322 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6324 /* Optionally warn of old-fashioned def with no previous prototype. */
6325 if (warn_strict_prototypes
6326 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6327 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6328 warning ("function declaration isn't a prototype");
6329 /* Optionally warn of any global def with no previous prototype. */
6330 else if (warn_missing_prototypes
6331 && TREE_PUBLIC (decl1)
6332 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6333 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6334 warning_with_decl (decl1, "no previous prototype for `%s'");
6335 /* Optionally warn of any def with no previous prototype
6336 if the function has already been used. */
6337 else if (warn_missing_prototypes
6338 && old_decl != 0 && TREE_USED (old_decl)
6339 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6340 warning_with_decl (decl1,
6341 "`%s' was used with no prototype before its definition");
6342 /* Optionally warn of any global def with no previous declaration. */
6343 else if (warn_missing_declarations
6344 && TREE_PUBLIC (decl1)
6346 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6347 warning_with_decl (decl1, "no previous declaration for `%s'");
6348 /* Optionally warn of any def with no previous declaration
6349 if the function has already been used. */
6350 else if (warn_missing_declarations
6351 && old_decl != 0 && TREE_USED (old_decl)
6352 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6353 warning_with_decl (decl1,
6354 "`%s' was used with no declaration before its definition");
6356 /* This is a definition, not a reference.
6357 So normally clear DECL_EXTERNAL.
6358 However, `extern inline' acts like a declaration
6359 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6360 DECL_EXTERNAL (decl1) = current_extern_inline;
6362 /* This function exists in static storage.
6363 (This does not mean `static' in the C sense!) */
6364 TREE_STATIC (decl1) = 1;
6366 /* A nested function is not global. */
6367 if (current_function_decl != 0)
6368 TREE_PUBLIC (decl1) = 0;
6370 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6372 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6377 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6378 != integer_type_node)
6379 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6381 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6382 args = TREE_CHAIN (args))
6384 tree type = args ? TREE_VALUE (args) : 0;
6386 if (type == void_type_node)
6393 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6394 pedwarn_with_decl (decl1,
6395 "first argument of `%s' should be `int'");
6399 if (TREE_CODE (type) != POINTER_TYPE
6400 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6401 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6403 pedwarn_with_decl (decl1,
6404 "second argument of `%s' should be `char **'");
6408 if (TREE_CODE (type) != POINTER_TYPE
6409 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6410 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6412 pedwarn_with_decl (decl1,
6413 "third argument of `%s' should probably be `char **'");
6418 /* It is intentional that this message does not mention the third
6419 argument, which is warned for only pedantically, because it's
6420 blessed by mention in an appendix of the standard. */
6421 if (argct > 0 && (argct < 2 || argct > 3))
6422 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6424 if (argct == 3 && pedantic)
6425 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6427 if (! TREE_PUBLIC (decl1))
6428 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6431 /* Record the decl so that the function name is defined.
6432 If we already have a decl for this name, and it is a FUNCTION_DECL,
6433 use the old decl. */
6435 current_function_decl = pushdecl (decl1);
6438 declare_parm_level (1);
6439 current_binding_level->subblocks_tag_transparent = 1;
6441 make_function_rtl (current_function_decl);
6443 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6444 /* Promote the value to int before returning it. */
6445 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6447 /* It retains unsignedness if traditional
6448 or if not really getting wider. */
6449 if (TREE_UNSIGNED (restype)
6450 && (flag_traditional
6451 || (TYPE_PRECISION (restype)
6452 == TYPE_PRECISION (integer_type_node))))
6453 restype = unsigned_type_node;
6455 restype = integer_type_node;
6457 DECL_RESULT (current_function_decl)
6458 = build_decl (RESULT_DECL, NULL_TREE, restype);
6461 /* Allocate further tree nodes temporarily during compilation
6462 of this function only. */
6463 temporary_allocation ();
6465 /* If this fcn was already referenced via a block-scope `extern' decl
6466 (or an implicit decl), propagate certain information about the usage. */
6467 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6468 TREE_ADDRESSABLE (current_function_decl) = 1;
6470 immediate_size_expand = old_immediate_size_expand;
6475 /* Record that this function is going to be a varargs function.
6476 This is called before store_parm_decls, which is too early
6477 to call mark_varargs directly. */
6482 c_function_varargs = 1;
6485 /* Store the parameter declarations into the current function declaration.
6486 This is called after parsing the parameter declarations, before
6487 digesting the body of the function.
6489 For an old-style definition, modify the function's type
6490 to specify at least the number of arguments. */
6495 register tree fndecl = current_function_decl;
6498 /* This is either a chain of PARM_DECLs (if a prototype was used)
6499 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6500 tree specparms = current_function_parms;
6502 /* This is a list of types declared among parms in a prototype. */
6503 tree parmtags = current_function_parm_tags;
6505 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6506 register tree parmdecls = getdecls ();
6508 /* This is a chain of any other decls that came in among the parm
6509 declarations. If a parm is declared with enum {foo, bar} x;
6510 then CONST_DECLs for foo and bar are put here. */
6513 /* Nonzero if this definition is written with a prototype. */
6516 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6518 /* This case is when the function was defined with an ANSI prototype.
6519 The parms already have decls, so we need not do anything here
6520 except record them as in effect
6521 and complain if any redundant old-style parm decls were written. */
6532 error_with_decl (fndecl,
6533 "parm types given both in parmlist and separately");
6534 /* Get rid of the erroneous decls; don't keep them on
6535 the list of parms, since they might not be PARM_DECLs. */
6536 for (decl = current_binding_level->names;
6537 decl; decl = TREE_CHAIN (decl))
6538 if (DECL_NAME (decl))
6539 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6540 for (link = current_binding_level->shadowed;
6541 link; link = TREE_CHAIN (link))
6542 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6543 current_binding_level->names = 0;
6544 current_binding_level->shadowed = 0;
6547 specparms = nreverse (specparms);
6548 for (parm = specparms; parm; parm = next)
6550 next = TREE_CHAIN (parm);
6551 if (TREE_CODE (parm) == PARM_DECL)
6553 if (DECL_NAME (parm) == 0)
6554 error_with_decl (parm, "parameter name omitted");
6555 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6557 error_with_decl (parm, "parameter `%s' declared void");
6558 /* Change the type to error_mark_node so this parameter
6559 will be ignored by assign_parms. */
6560 TREE_TYPE (parm) = error_mark_node;
6566 /* If we find an enum constant or a type tag,
6567 put it aside for the moment. */
6568 TREE_CHAIN (parm) = 0;
6569 others = chainon (others, parm);
6573 /* Get the decls in their original chain order
6574 and record in the function. */
6575 DECL_ARGUMENTS (fndecl) = getdecls ();
6578 /* If this function takes a variable number of arguments,
6579 add a phony parameter to the end of the parm list,
6580 to represent the position of the first unnamed argument. */
6581 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6584 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6585 /* Let's hope the address of the unnamed parm
6586 won't depend on its type. */
6587 TREE_TYPE (dummy) = integer_type_node;
6588 DECL_ARG_TYPE (dummy) = integer_type_node;
6589 DECL_ARGUMENTS (fndecl)
6590 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6594 /* Now pushdecl the enum constants. */
6595 for (parm = others; parm; parm = next)
6597 next = TREE_CHAIN (parm);
6598 if (DECL_NAME (parm) == 0)
6600 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6602 else if (TREE_CODE (parm) != PARM_DECL)
6606 storetags (chainon (parmtags, gettags ()));
6610 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6611 each with a parm name as the TREE_VALUE.
6613 PARMDECLS is a chain of declarations for parameters.
6614 Warning! It can also contain CONST_DECLs which are not parameters
6615 but are names of enumerators of any enum types
6616 declared among the parameters.
6618 First match each formal parameter name with its declaration.
6619 Associate decls with the names and store the decls
6620 into the TREE_PURPOSE slots. */
6622 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6623 DECL_RESULT (parm) = 0;
6625 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6627 register tree tail, found = NULL;
6629 if (TREE_VALUE (parm) == 0)
6631 error_with_decl (fndecl, "parameter name missing from parameter list");
6632 TREE_PURPOSE (parm) = 0;
6636 /* See if any of the parmdecls specifies this parm by name.
6637 Ignore any enumerator decls. */
6638 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6639 if (DECL_NAME (tail) == TREE_VALUE (parm)
6640 && TREE_CODE (tail) == PARM_DECL)
6646 /* If declaration already marked, we have a duplicate name.
6647 Complain, and don't use this decl twice. */
6648 if (found && DECL_RESULT (found) != 0)
6650 error_with_decl (found, "multiple parameters named `%s'");
6654 /* If the declaration says "void", complain and ignore it. */
6655 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6657 error_with_decl (found, "parameter `%s' declared void");
6658 TREE_TYPE (found) = integer_type_node;
6659 DECL_ARG_TYPE (found) = integer_type_node;
6660 layout_decl (found, 0);
6663 /* Traditionally, a parm declared float is actually a double. */
6664 if (found && flag_traditional
6665 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6667 TREE_TYPE (found) = double_type_node;
6668 DECL_ARG_TYPE (found) = double_type_node;
6669 layout_decl (found, 0);
6672 /* If no declaration found, default to int. */
6675 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6677 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6678 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6679 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6681 warning_with_decl (found, "type of `%s' defaults to `int'");
6685 TREE_PURPOSE (parm) = found;
6687 /* Mark this decl as "already found" -- see test, above.
6688 It is safe to use DECL_RESULT for this
6689 since it is not used in PARM_DECLs or CONST_DECLs. */
6690 DECL_RESULT (found) = error_mark_node;
6693 /* Put anything which is on the parmdecls chain and which is
6694 not a PARM_DECL onto the list NONPARMS. (The types of
6695 non-parm things which might appear on the list include
6696 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6697 any actual PARM_DECLs not matched with any names. */
6700 for (parm = parmdecls; parm; )
6702 tree next = TREE_CHAIN (parm);
6703 TREE_CHAIN (parm) = 0;
6705 if (TREE_CODE (parm) != PARM_DECL)
6706 nonparms = chainon (nonparms, parm);
6709 /* Complain about args with incomplete types. */
6710 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6712 error_with_decl (parm, "parameter `%s' has incomplete type");
6713 TREE_TYPE (parm) = error_mark_node;
6716 if (DECL_RESULT (parm) == 0)
6718 error_with_decl (parm,
6719 "declaration for parameter `%s' but no such parameter");
6720 /* Pretend the parameter was not missing.
6721 This gets us to a standard state and minimizes
6722 further error messages. */
6724 = chainon (specparms,
6725 tree_cons (parm, NULL_TREE, NULL_TREE));
6732 /* Chain the declarations together in the order of the list of names. */
6733 /* Store that chain in the function decl, replacing the list of names. */
6735 DECL_ARGUMENTS (fndecl) = 0;
6738 for (last = 0; parm; parm = TREE_CHAIN (parm))
6739 if (TREE_PURPOSE (parm))
6742 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6744 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6745 last = TREE_PURPOSE (parm);
6746 TREE_CHAIN (last) = 0;
6750 /* If there was a previous prototype,
6751 set the DECL_ARG_TYPE of each argument according to
6752 the type previously specified, and report any mismatches. */
6754 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6757 for (parm = DECL_ARGUMENTS (fndecl),
6758 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6759 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6760 != void_type_node));
6761 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6763 if (parm == 0 || type == 0
6764 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6766 error ("number of arguments doesn't match prototype");
6767 error_with_file_and_line (current_function_prototype_file,
6768 current_function_prototype_line,
6769 "prototype declaration");
6772 /* Type for passing arg must be consistent
6773 with that declared for the arg. */
6774 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6776 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6777 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6779 /* Adjust argument to match prototype. E.g. a previous
6780 `int foo(float);' prototype causes
6781 `int foo(x) float x; {...}' to be treated like
6782 `int foo(float x) {...}'. This is particularly
6783 useful for argument types like uid_t. */
6784 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6785 #ifdef PROMOTE_PROTOTYPES
6786 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6787 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6788 && TYPE_PRECISION (TREE_TYPE (parm))
6789 < TYPE_PRECISION (integer_type_node))
6790 DECL_ARG_TYPE (parm) = integer_type_node;
6794 pedwarn ("promoted argument `%s' doesn't match prototype",
6795 IDENTIFIER_POINTER (DECL_NAME (parm)));
6796 warning_with_file_and_line
6797 (current_function_prototype_file,
6798 current_function_prototype_line,
6799 "prototype declaration");
6802 /* If -traditional, allow `int' argument to match
6803 `unsigned' prototype. */
6804 else if (! (flag_traditional
6805 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6806 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6808 error ("argument `%s' doesn't match prototype",
6809 IDENTIFIER_POINTER (DECL_NAME (parm)));
6810 error_with_file_and_line (current_function_prototype_file,
6811 current_function_prototype_line,
6812 "prototype declaration");
6816 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6819 /* Otherwise, create a prototype that would match. */
6823 tree actual = 0, last = 0, type;
6825 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6827 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6830 TREE_CHAIN (last) = type;
6835 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6837 TREE_CHAIN (last) = type;
6841 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6842 of the type of this function, but we need to avoid having this
6843 affect the types of other similarly-typed functions, so we must
6844 first force the generation of an identical (but separate) type
6845 node for the relevant function type. The new node we create
6846 will be a variant of the main variant of the original function
6849 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6851 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6854 /* Now store the final chain of decls for the arguments
6855 as the decl-chain of the current lexical scope.
6856 Put the enumerators in as well, at the front so that
6857 DECL_ARGUMENTS is not modified. */
6859 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6862 /* Make sure the binding level for the top of the function body
6863 gets a BLOCK if there are any in the function.
6864 Otherwise, the dbx output is wrong. */
6866 keep_next_if_subblocks = 1;
6868 /* ??? This might be an improvement,
6869 but needs to be thought about some more. */
6871 keep_next_level_flag = 1;
6874 /* Write a record describing this function definition to the prototypes
6875 file (if requested). */
6877 gen_aux_info_record (fndecl, 1, 0, prototype);
6879 /* Initialize the RTL code for the function. */
6881 init_function_start (fndecl, input_filename, lineno);
6883 /* If this is a varargs function, inform function.c. */
6885 if (c_function_varargs)
6888 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6890 declare_function_name ();
6892 /* Set up parameters and prepare for return, for the function. */
6894 expand_function_start (fndecl, 0);
6896 /* If this function is `main', emit a call to `__main'
6897 to run global initializers, etc. */
6898 if (DECL_NAME (fndecl)
6899 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6900 && DECL_CONTEXT (fndecl) == NULL_TREE)
6901 expand_main_function ();
6904 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6905 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6906 stands for an ellipsis in the identifier list.
6908 PARMLIST is the data returned by get_parm_info for the
6909 parmlist that follows the semicolon.
6911 We return a value of the same sort that get_parm_info returns,
6912 except that it describes the combination of identifiers and parmlist. */
6915 combine_parm_decls (specparms, parmlist, void_at_end)
6916 tree specparms, parmlist;
6919 register tree fndecl = current_function_decl;
6922 tree parmdecls = TREE_PURPOSE (parmlist);
6924 /* This is a chain of any other decls that came in among the parm
6925 declarations. They were separated already by get_parm_info,
6926 so we just need to keep them separate. */
6927 tree nonparms = TREE_VALUE (parmlist);
6931 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6932 DECL_RESULT (parm) = 0;
6934 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6936 register tree tail, found = NULL;
6938 /* See if any of the parmdecls specifies this parm by name. */
6939 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6940 if (DECL_NAME (tail) == TREE_VALUE (parm))
6946 /* If declaration already marked, we have a duplicate name.
6947 Complain, and don't use this decl twice. */
6948 if (found && DECL_RESULT (found) != 0)
6950 error_with_decl (found, "multiple parameters named `%s'");
6954 /* If the declaration says "void", complain and ignore it. */
6955 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6957 error_with_decl (found, "parameter `%s' declared void");
6958 TREE_TYPE (found) = integer_type_node;
6959 DECL_ARG_TYPE (found) = integer_type_node;
6960 layout_decl (found, 0);
6963 /* Traditionally, a parm declared float is actually a double. */
6964 if (found && flag_traditional
6965 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6967 TREE_TYPE (found) = double_type_node;
6968 DECL_ARG_TYPE (found) = double_type_node;
6969 layout_decl (found, 0);
6972 /* If no declaration found, default to int. */
6975 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6977 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6978 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6979 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6980 error_with_decl (found, "type of parameter `%s' is not declared");
6984 TREE_PURPOSE (parm) = found;
6986 /* Mark this decl as "already found" -- see test, above.
6987 It is safe to use DECL_RESULT for this
6988 since it is not used in PARM_DECLs or CONST_DECLs. */
6989 DECL_RESULT (found) = error_mark_node;
6992 /* Complain about any actual PARM_DECLs not matched with any names. */
6994 for (parm = parmdecls; parm; )
6996 tree next = TREE_CHAIN (parm);
6997 TREE_CHAIN (parm) = 0;
6999 /* Complain about args with incomplete types. */
7000 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7002 error_with_decl (parm, "parameter `%s' has incomplete type");
7003 TREE_TYPE (parm) = error_mark_node;
7006 if (DECL_RESULT (parm) == 0)
7008 error_with_decl (parm,
7009 "declaration for parameter `%s' but no such parameter");
7010 /* Pretend the parameter was not missing.
7011 This gets us to a standard state and minimizes
7012 further error messages. */
7014 = chainon (specparms,
7015 tree_cons (parm, NULL_TREE, NULL_TREE));
7021 /* Chain the declarations together in the order of the list of names.
7022 At the same time, build up a list of their types, in reverse order. */
7028 for (last = 0; parm; parm = TREE_CHAIN (parm))
7029 if (TREE_PURPOSE (parm))
7032 parmdecls = TREE_PURPOSE (parm);
7034 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7035 last = TREE_PURPOSE (parm);
7036 TREE_CHAIN (last) = 0;
7038 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7043 return saveable_tree_cons (parmdecls, nonparms,
7044 nreverse (saveable_tree_cons (NULL_TREE,
7048 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7051 /* Finish up a function declaration and compile that function
7052 all the way to assembler language output. The free the storage
7053 for the function definition.
7055 This is called after parsing the body of the function definition.
7057 NESTED is nonzero if the function being finished is nested in another. */
7060 finish_function (nested)
7063 register tree fndecl = current_function_decl;
7065 /* TREE_READONLY (fndecl) = 1;
7066 This caused &foo to be of type ptr-to-const-function
7067 which then got a warning when stored in a ptr-to-function variable. */
7070 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7072 /* Must mark the RESULT_DECL as being in this function. */
7074 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7076 /* Obey `register' declarations if `setjmp' is called in this fn. */
7077 if (flag_traditional && current_function_calls_setjmp)
7079 setjmp_protect (DECL_INITIAL (fndecl));
7080 setjmp_protect_args ();
7083 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7085 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7086 != integer_type_node)
7088 /* You would expect the sense of this test to be the other way
7089 around, but if warn_main is set, we will already have warned,
7090 so this would be a duplicate. This is the warning you get
7091 in some environments even if you *don't* ask for it, because
7092 these are environments where it may be more of a problem than
7095 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7099 #ifdef DEFAULT_MAIN_RETURN
7100 /* Make it so that `main' always returns success by default. */
7101 DEFAULT_MAIN_RETURN;
7106 /* Generate rtl for function exit. */
7107 expand_function_end (input_filename, lineno, 0);
7109 /* So we can tell if jump_optimize sets it to 1. */
7112 /* Run the optimizers and output the assembler code for this function. */
7113 rest_of_compilation (fndecl);
7115 current_function_returns_null |= can_reach_end;
7117 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7118 warning ("`noreturn' function does return");
7119 else if (warn_return_type && can_reach_end
7120 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7121 /* If this function returns non-void and control can drop through,
7123 warning ("control reaches end of non-void function");
7124 /* With just -W, complain only if function returns both with
7125 and without a value. */
7126 else if (extra_warnings
7127 && current_function_returns_value && current_function_returns_null)
7128 warning ("this function may return with or without a value");
7130 /* If requested, warn about function definitions where the function will
7131 return a value (usually of some struct or union type) which itself will
7132 take up a lot of stack space. */
7134 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7136 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7140 register tree ret_type_size = TYPE_SIZE (ret_type);
7142 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7145 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7147 if (units > larger_than_size)
7148 warning_with_decl (fndecl,
7149 "size of return value of `%s' is %u bytes",
7155 /* Free all the tree nodes making up this function. */
7156 /* Switch back to allocating nodes permanently
7157 until we start another function. */
7159 permanent_allocation (1);
7161 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7163 /* Stop pointing to the local nodes about to be freed. */
7164 /* But DECL_INITIAL must remain nonzero so we know this
7165 was an actual function definition. */
7166 /* For a nested function, this is done in pop_c_function_context. */
7167 /* If rest_of_compilation set this to 0, leave it 0. */
7168 if (DECL_INITIAL (fndecl) != 0)
7169 DECL_INITIAL (fndecl) = error_mark_node;
7170 DECL_ARGUMENTS (fndecl) = 0;
7173 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7175 #ifndef ASM_OUTPUT_CONSTRUCTOR
7176 if (! flag_gnu_linker)
7177 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7180 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7182 if (DECL_STATIC_DESTRUCTOR (fndecl))
7184 #ifndef ASM_OUTPUT_DESTRUCTOR
7185 if (! flag_gnu_linker)
7186 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7189 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7194 /* Let the error reporting routines know that we're outside a
7195 function. For a nested function, this value is used in
7196 pop_c_function_context and then reset via pop_function_context. */
7197 current_function_decl = NULL;
7201 /* Save and restore the variables in this file and elsewhere
7202 that keep track of the progress of compilation of the current function.
7203 Used for nested functions. */
7207 struct c_function *next;
7209 tree shadowed_labels;
7212 int warn_about_return_type;
7214 struct binding_level *binding_level;
7217 struct c_function *c_function_chain;
7219 /* Save and reinitialize the variables
7220 used during compilation of a C function. */
7223 push_c_function_context ()
7225 struct c_function *p
7226 = (struct c_function *) xmalloc (sizeof (struct c_function));
7229 pedwarn ("ANSI C forbids nested functions");
7231 push_function_context ();
7233 p->next = c_function_chain;
7234 c_function_chain = p;
7236 p->named_labels = named_labels;
7237 p->shadowed_labels = shadowed_labels;
7238 p->returns_value = current_function_returns_value;
7239 p->returns_null = current_function_returns_null;
7240 p->warn_about_return_type = warn_about_return_type;
7241 p->extern_inline = current_extern_inline;
7242 p->binding_level = current_binding_level;
7245 /* Restore the variables used during compilation of a C function. */
7248 pop_c_function_context ()
7250 struct c_function *p = c_function_chain;
7253 /* Bring back all the labels that were shadowed. */
7254 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7255 if (DECL_NAME (TREE_VALUE (link)) != 0)
7256 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7257 = TREE_VALUE (link);
7259 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7261 /* Stop pointing to the local nodes about to be freed. */
7262 /* But DECL_INITIAL must remain nonzero so we know this
7263 was an actual function definition. */
7264 DECL_INITIAL (current_function_decl) = error_mark_node;
7265 DECL_ARGUMENTS (current_function_decl) = 0;
7268 pop_function_context ();
7270 c_function_chain = p->next;
7272 named_labels = p->named_labels;
7273 shadowed_labels = p->shadowed_labels;
7274 current_function_returns_value = p->returns_value;
7275 current_function_returns_null = p->returns_null;
7276 warn_about_return_type = p->warn_about_return_type;
7277 current_extern_inline = p->extern_inline;
7278 current_binding_level = p->binding_level;
7283 /* integrate_decl_tree calls this function, but since we don't use the
7284 DECL_LANG_SPECIFIC field, this is a no-op. */
7287 copy_lang_decl (node)