1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
38 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
40 { NORMAL, /* Ordinary declaration */
41 FUNCDEF, /* Function definition */
42 PARM, /* Declaration of parm before function body */
43 FIELD, /* Declaration inside struct or union */
44 BITFIELD, /* Likewise but with specified width */
45 TYPENAME}; /* Typename (inside cast or sizeof) */
47 #ifndef CHAR_TYPE_SIZE
48 #define CHAR_TYPE_SIZE BITS_PER_UNIT
51 #ifndef SHORT_TYPE_SIZE
52 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
56 #define INT_TYPE_SIZE BITS_PER_WORD
59 #ifndef LONG_TYPE_SIZE
60 #define LONG_TYPE_SIZE BITS_PER_WORD
63 #ifndef LONG_LONG_TYPE_SIZE
64 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
67 #ifndef WCHAR_UNSIGNED
68 #define WCHAR_UNSIGNED 0
71 #ifndef FLOAT_TYPE_SIZE
72 #define FLOAT_TYPE_SIZE BITS_PER_WORD
75 #ifndef DOUBLE_TYPE_SIZE
76 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
79 #ifndef LONG_DOUBLE_TYPE_SIZE
80 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
83 /* We let tm.h override the types used here, to handle trivial differences
84 such as the choice of unsigned int or long unsigned int for size_t.
85 When machines start needing nontrivial differences in the size type,
86 it would be best to do something here to figure out automatically
87 from other information what type to use. */
90 #define SIZE_TYPE "long unsigned int"
94 #define PTRDIFF_TYPE "long int"
98 #define WCHAR_TYPE "int"
101 /* a node which has tree code ERROR_MARK, and whose type is itself.
102 All erroneous expressions are replaced with this node. All functions
103 that accept nodes as arguments should avoid generating error messages
104 if this node is one of the arguments, since it is undesirable to get
105 multiple error messages from one error in the input. */
107 tree error_mark_node;
109 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
111 tree short_integer_type_node;
112 tree integer_type_node;
113 tree long_integer_type_node;
114 tree long_long_integer_type_node;
116 tree short_unsigned_type_node;
117 tree unsigned_type_node;
118 tree long_unsigned_type_node;
119 tree long_long_unsigned_type_node;
121 tree boolean_type_node;
122 tree boolean_false_node;
123 tree boolean_true_node;
125 tree ptrdiff_type_node;
127 tree unsigned_char_type_node;
128 tree signed_char_type_node;
130 tree wchar_type_node;
131 tree signed_wchar_type_node;
132 tree unsigned_wchar_type_node;
134 tree float_type_node;
135 tree double_type_node;
136 tree long_double_type_node;
138 tree complex_integer_type_node;
139 tree complex_float_type_node;
140 tree complex_double_type_node;
141 tree complex_long_double_type_node;
143 tree intQI_type_node;
144 tree intHI_type_node;
145 tree intSI_type_node;
146 tree intDI_type_node;
147 tree intTI_type_node;
149 tree unsigned_intQI_type_node;
150 tree unsigned_intHI_type_node;
151 tree unsigned_intSI_type_node;
152 tree unsigned_intDI_type_node;
153 tree unsigned_intTI_type_node;
155 /* a VOID_TYPE node. */
159 /* Nodes for types `void *' and `const void *'. */
161 tree ptr_type_node, const_ptr_type_node;
163 /* Nodes for types `char *' and `const char *'. */
165 tree string_type_node, const_string_type_node;
167 /* Type `char[SOMENUMBER]'.
168 Used when an array of char is needed and the size is irrelevant. */
170 tree char_array_type_node;
172 /* Type `int[SOMENUMBER]' or something like it.
173 Used when an array of int needed and the size is irrelevant. */
175 tree int_array_type_node;
177 /* Type `wchar_t[SOMENUMBER]' or something like it.
178 Used when a wide string literal is created. */
180 tree wchar_array_type_node;
182 /* type `int ()' -- used for implicit declaration of functions. */
184 tree default_function_type;
186 /* function types `double (double)' and `double (double, double)', etc. */
188 tree double_ftype_double, double_ftype_double_double;
189 tree int_ftype_int, long_ftype_long;
190 tree float_ftype_float;
191 tree ldouble_ftype_ldouble;
193 /* Function type `void (void *, void *, int)' and similar ones */
195 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
197 /* Function type `char *(char *, char *)' and similar ones */
198 tree string_ftype_ptr_ptr, int_ftype_string_string;
200 /* Function type `int (const void *, const void *, size_t)' */
201 tree int_ftype_cptr_cptr_sizet;
203 /* Two expressions that are constants with value zero.
204 The first is of type `int', the second of type `void *'. */
206 tree integer_zero_node;
207 tree null_pointer_node;
209 /* A node for the integer constant 1. */
211 tree integer_one_node;
213 /* Nonzero if we have seen an invalid cross reference
214 to a struct, union, or enum, but not yet printed the message. */
216 tree pending_invalid_xref;
217 /* File and line to appear in the eventual error message. */
218 char *pending_invalid_xref_file;
219 int pending_invalid_xref_line;
221 /* While defining an enum type, this is 1 plus the last enumerator
222 constant value. Note that will do not have to save this or `enum_overflow'
223 around nested function definition since such a definition could only
224 occur in an enum value expression and we don't use these variables in
227 static tree enum_next_value;
229 /* Nonzero means that there was overflow computing enum_next_value. */
231 static int enum_overflow;
233 /* Parsing a function declarator leaves a list of parameter names
234 or a chain or parameter decls here. */
236 static tree last_function_parms;
238 /* Parsing a function declarator leaves here a chain of structure
239 and enum types declared in the parmlist. */
241 static tree last_function_parm_tags;
243 /* After parsing the declarator that starts a function definition,
244 `start_function' puts here the list of parameter names or chain of decls.
245 `store_parm_decls' finds it here. */
247 static tree current_function_parms;
249 /* Similar, for last_function_parm_tags. */
250 static tree current_function_parm_tags;
252 /* Similar, for the file and line that the prototype came from if this is
253 an old-style definition. */
254 static char *current_function_prototype_file;
255 static int current_function_prototype_line;
257 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
258 that have names. Here so we can clear out their names' definitions
259 at the end of the function. */
261 static tree named_labels;
263 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
265 static tree shadowed_labels;
267 /* Nonzero when store_parm_decls is called indicates a varargs function.
268 Value not meaningful after store_parm_decls. */
270 static int c_function_varargs;
272 /* The FUNCTION_DECL for the function currently being compiled,
273 or 0 if between functions. */
274 tree current_function_decl;
276 /* Set to 0 at beginning of a function definition, set to 1 if
277 a return statement that specifies a return value is seen. */
279 int current_function_returns_value;
281 /* Set to 0 at beginning of a function definition, set to 1 if
282 a return statement with no argument is seen. */
284 int current_function_returns_null;
286 /* Set to nonzero by `grokdeclarator' for a function
287 whose return type is defaulted, if warnings for this are desired. */
289 static int warn_about_return_type;
291 /* Nonzero when starting a function declared `extern inline'. */
293 static int current_extern_inline;
295 /* For each binding contour we allocate a binding_level structure
296 * which records the names defined in that contour.
299 * 1) one for each function definition,
300 * where internal declarations of the parameters appear.
301 * 2) one for each compound statement,
302 * to record its declarations.
304 * The current meaning of a name can be found by searching the levels from
305 * the current one out to the global one.
308 /* Note that the information in the `names' component of the global contour
309 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
313 /* A chain of _DECL nodes for all variables, constants, functions,
314 and typedef types. These are in the reverse of the order supplied.
318 /* A list of structure, union and enum definitions,
319 * for looking up tag names.
320 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
321 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
322 * or ENUMERAL_TYPE node.
326 /* For each level, a list of shadowed outer-level local definitions
327 to be restored when this level is popped.
328 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
329 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
332 /* For each level (except not the global one),
333 a chain of BLOCK nodes for all the levels
334 that were entered and exited one level down. */
337 /* The BLOCK node for this level, if one has been preallocated.
338 If 0, the BLOCK is allocated (if needed) when the level is popped. */
341 /* The binding level which this one is contained in (inherits from). */
342 struct binding_level *level_chain;
344 /* Nonzero for the level that holds the parameters of a function. */
347 /* Nonzero if this level "doesn't exist" for tags. */
348 char tag_transparent;
350 /* Nonzero if sublevels of this level "don't exist" for tags.
351 This is set in the parm level of a function definition
352 while reading the function body, so that the outermost block
353 of the function body will be tag-transparent. */
354 char subblocks_tag_transparent;
356 /* Nonzero means make a BLOCK for this level regardless of all else. */
359 /* Nonzero means make a BLOCK if this level has any subblocks. */
360 char keep_if_subblocks;
362 /* Number of decls in `names' that have incomplete
363 structure or union types. */
366 /* A list of decls giving the (reversed) specified order of parms,
367 not including any forward-decls in the parmlist.
368 This is so we can put the parms in proper order for assign_parms. */
372 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
374 /* The binding level currently in effect. */
376 static struct binding_level *current_binding_level;
378 /* A chain of binding_level structures awaiting reuse. */
380 static struct binding_level *free_binding_level;
382 /* The outermost binding level, for names of file scope.
383 This is created when the compiler is started and exists
384 through the entire run. */
386 static struct binding_level *global_binding_level;
388 /* Binding level structures are initialized by copying this one. */
390 static struct binding_level clear_binding_level
391 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
394 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
396 static int keep_next_level_flag;
398 /* Nonzero means make a BLOCK for the next level pushed
399 if it has subblocks. */
401 static int keep_next_if_subblocks;
403 /* The chain of outer levels of label scopes.
404 This uses the same data structure used for binding levels,
405 but it works differently: each link in the chain records
406 saved values of named_labels and shadowed_labels for
407 a label binding level outside the current one. */
409 static struct binding_level *label_level_chain;
411 /* Functions called automatically at the beginning and end of execution. */
413 tree static_ctors, static_dtors;
415 /* Forward declarations. */
417 static struct binding_level * make_binding_level PROTO((void));
418 static void clear_limbo_values PROTO((tree));
419 static int duplicate_decls PROTO((tree, tree, int));
420 static char *redeclaration_error_message PROTO((tree, tree));
421 static void storedecls PROTO((tree));
422 static void storetags PROTO((tree));
423 static tree lookup_tag PROTO((enum tree_code, tree,
424 struct binding_level *, int));
425 static tree lookup_tag_reverse PROTO((tree));
426 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
428 static tree grokparms PROTO((tree, int));
429 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
430 static void layout_array_type PROTO((tree));
432 /* C-specific option variables. */
434 /* Nonzero means allow type mismatches in conditional expressions;
435 just make their values `void'. */
437 int flag_cond_mismatch;
439 /* Nonzero means give `double' the same size as `float'. */
441 int flag_short_double;
443 /* Nonzero means don't recognize the keyword `asm'. */
447 /* Nonzero means don't recognize any builtin functions. */
451 /* Nonzero means don't recognize the non-ANSI builtin functions.
454 int flag_no_nonansi_builtin;
456 /* Nonzero means do some things the same way PCC does. */
458 int flag_traditional;
460 /* Nonzero means that we have builtin functions, and main is an int */
464 /* Nonzero means to allow single precision math even if we're generally
465 being traditional. */
466 int flag_allow_single_precision = 0;
468 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
470 int flag_signed_bitfields = 1;
471 int explicit_flag_signed_bitfields = 0;
473 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
475 int flag_no_ident = 0;
477 /* Nonzero means warn about use of implicit int. */
479 int warn_implicit_int;
481 /* Nonzero means message about use of implicit function declarations;
482 1 means warning; 2 means error. */
484 int mesg_implicit_function_declaration;
486 /* Nonzero means give string constants the type `const char *'
487 to get extra warnings from them. These warnings will be too numerous
488 to be useful, except in thoroughly ANSIfied programs. */
490 int warn_write_strings;
492 /* Nonzero means warn about pointer casts that can drop a type qualifier
493 from the pointer target type. */
497 /* Nonzero means warn when casting a function call to a type that does
498 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
499 when there is no previous declaration of sqrt or malloc. */
501 int warn_bad_function_cast;
503 /* Warn about traditional constructs whose meanings changed in ANSI C. */
505 int warn_traditional;
507 /* Nonzero means warn about sizeof(function) or addition/subtraction
508 of function pointers. */
510 int warn_pointer_arith;
512 /* Nonzero means warn for non-prototype function decls
513 or non-prototyped defs without previous prototype. */
515 int warn_strict_prototypes;
517 /* Nonzero means warn for any global function def
518 without separate previous prototype decl. */
520 int warn_missing_prototypes;
522 /* Nonzero means warn for any global function def
523 without separate previous decl. */
525 int warn_missing_declarations;
527 /* Nonzero means warn about multiple (redundant) decls for the same single
528 variable or function. */
530 int warn_redundant_decls = 0;
532 /* Nonzero means warn about extern declarations of objects not at
533 file-scope level and about *all* declarations of functions (whether
534 extern or static) not at file-scope level. Note that we exclude
535 implicit function declarations. To get warnings about those, use
538 int warn_nested_externs = 0;
540 /* Warn about *printf or *scanf format/argument anomalies. */
544 /* Warn about a subscript that has type char. */
546 int warn_char_subscripts = 0;
548 /* Warn if a type conversion is done that might have confusing results. */
552 /* Warn if adding () is suggested. */
554 int warn_parentheses;
556 /* Warn if initializer is not completely bracketed. */
558 int warn_missing_braces;
560 /* Warn if main is suspicious. */
564 /* Warn about #pragma directives that are not recognised. */
566 int warn_unknown_pragmas = 0; /* Tri state variable. */
568 /* Warn about comparison of signed and unsigned values.
569 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
571 int warn_sign_compare = -1;
573 /* Nonzero means `$' can be in an identifier. */
575 #ifndef DOLLARS_IN_IDENTIFIERS
576 #define DOLLARS_IN_IDENTIFIERS 1
578 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
580 /* Decode the string P as a language-specific option for C.
581 Return 1 if it is recognized (and handle it);
582 return 0 if not recognized. */
588 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
590 flag_traditional = 1;
591 flag_writable_strings = 1;
593 else if (!strcmp (p, "-fallow-single-precision"))
594 flag_allow_single_precision = 1;
595 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
600 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
604 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
608 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
610 flag_traditional = 0;
611 flag_writable_strings = 0;
613 else if (!strcmp (p, "-fdollars-in-identifiers"))
614 dollars_in_ident = 1;
615 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
616 dollars_in_ident = 0;
617 else if (!strcmp (p, "-fsigned-char"))
618 flag_signed_char = 1;
619 else if (!strcmp (p, "-funsigned-char"))
620 flag_signed_char = 0;
621 else if (!strcmp (p, "-fno-signed-char"))
622 flag_signed_char = 0;
623 else if (!strcmp (p, "-fno-unsigned-char"))
624 flag_signed_char = 1;
625 else if (!strcmp (p, "-fsigned-bitfields")
626 || !strcmp (p, "-fno-unsigned-bitfields"))
628 flag_signed_bitfields = 1;
629 explicit_flag_signed_bitfields = 1;
631 else if (!strcmp (p, "-funsigned-bitfields")
632 || !strcmp (p, "-fno-signed-bitfields"))
634 flag_signed_bitfields = 0;
635 explicit_flag_signed_bitfields = 1;
637 else if (!strcmp (p, "-fshort-enums"))
638 flag_short_enums = 1;
639 else if (!strcmp (p, "-fno-short-enums"))
640 flag_short_enums = 0;
641 else if (!strcmp (p, "-fcond-mismatch"))
642 flag_cond_mismatch = 1;
643 else if (!strcmp (p, "-fno-cond-mismatch"))
644 flag_cond_mismatch = 0;
645 else if (!strcmp (p, "-fshort-double"))
646 flag_short_double = 1;
647 else if (!strcmp (p, "-fno-short-double"))
648 flag_short_double = 0;
649 else if (!strcmp (p, "-fasm"))
651 else if (!strcmp (p, "-fno-asm"))
653 else if (!strcmp (p, "-fbuiltin"))
655 else if (!strcmp (p, "-fno-builtin"))
657 else if (!strcmp (p, "-fno-ident"))
659 else if (!strcmp (p, "-fident"))
661 else if (!strcmp (p, "-ansi"))
662 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
663 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
664 mesg_implicit_function_declaration = 2;
665 else if (!strcmp (p, "-Wimplicit-function-declaration"))
666 mesg_implicit_function_declaration = 1;
667 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
668 mesg_implicit_function_declaration = 0;
669 else if (!strcmp (p, "-Wimplicit-int"))
670 warn_implicit_int = 1;
671 else if (!strcmp (p, "-Wno-implicit-int"))
672 warn_implicit_int = 0;
673 else if (!strcmp (p, "-Wimplicit"))
675 warn_implicit_int = 1;
676 if (mesg_implicit_function_declaration != 2)
677 mesg_implicit_function_declaration = 1;
679 else if (!strcmp (p, "-Wno-implicit"))
680 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
681 else if (!strcmp (p, "-Wwrite-strings"))
682 warn_write_strings = 1;
683 else if (!strcmp (p, "-Wno-write-strings"))
684 warn_write_strings = 0;
685 else if (!strcmp (p, "-Wcast-qual"))
687 else if (!strcmp (p, "-Wno-cast-qual"))
689 else if (!strcmp (p, "-Wbad-function-cast"))
690 warn_bad_function_cast = 1;
691 else if (!strcmp (p, "-Wno-bad-function-cast"))
692 warn_bad_function_cast = 0;
693 else if (!strcmp (p, "-Wpointer-arith"))
694 warn_pointer_arith = 1;
695 else if (!strcmp (p, "-Wno-pointer-arith"))
696 warn_pointer_arith = 0;
697 else if (!strcmp (p, "-Wstrict-prototypes"))
698 warn_strict_prototypes = 1;
699 else if (!strcmp (p, "-Wno-strict-prototypes"))
700 warn_strict_prototypes = 0;
701 else if (!strcmp (p, "-Wmissing-prototypes"))
702 warn_missing_prototypes = 1;
703 else if (!strcmp (p, "-Wno-missing-prototypes"))
704 warn_missing_prototypes = 0;
705 else if (!strcmp (p, "-Wmissing-declarations"))
706 warn_missing_declarations = 1;
707 else if (!strcmp (p, "-Wno-missing-declarations"))
708 warn_missing_declarations = 0;
709 else if (!strcmp (p, "-Wredundant-decls"))
710 warn_redundant_decls = 1;
711 else if (!strcmp (p, "-Wno-redundant-decls"))
712 warn_redundant_decls = 0;
713 else if (!strcmp (p, "-Wnested-externs"))
714 warn_nested_externs = 1;
715 else if (!strcmp (p, "-Wno-nested-externs"))
716 warn_nested_externs = 0;
717 else if (!strcmp (p, "-Wtraditional"))
718 warn_traditional = 1;
719 else if (!strcmp (p, "-Wno-traditional"))
720 warn_traditional = 0;
721 else if (!strcmp (p, "-Wformat"))
723 else if (!strcmp (p, "-Wno-format"))
725 else if (!strcmp (p, "-Wchar-subscripts"))
726 warn_char_subscripts = 1;
727 else if (!strcmp (p, "-Wno-char-subscripts"))
728 warn_char_subscripts = 0;
729 else if (!strcmp (p, "-Wconversion"))
731 else if (!strcmp (p, "-Wno-conversion"))
733 else if (!strcmp (p, "-Wparentheses"))
734 warn_parentheses = 1;
735 else if (!strcmp (p, "-Wno-parentheses"))
736 warn_parentheses = 0;
737 else if (!strcmp (p, "-Wreturn-type"))
738 warn_return_type = 1;
739 else if (!strcmp (p, "-Wno-return-type"))
740 warn_return_type = 0;
741 else if (!strcmp (p, "-Wcomment"))
742 ; /* cpp handles this one. */
743 else if (!strcmp (p, "-Wno-comment"))
744 ; /* cpp handles this one. */
745 else if (!strcmp (p, "-Wcomments"))
746 ; /* cpp handles this one. */
747 else if (!strcmp (p, "-Wno-comments"))
748 ; /* cpp handles this one. */
749 else if (!strcmp (p, "-Wtrigraphs"))
750 ; /* cpp handles this one. */
751 else if (!strcmp (p, "-Wno-trigraphs"))
752 ; /* cpp handles this one. */
753 else if (!strcmp (p, "-Wundef"))
754 ; /* cpp handles this one. */
755 else if (!strcmp (p, "-Wno-undef"))
756 ; /* cpp handles this one. */
757 else if (!strcmp (p, "-Wimport"))
758 ; /* cpp handles this one. */
759 else if (!strcmp (p, "-Wno-import"))
760 ; /* cpp handles this one. */
761 else if (!strcmp (p, "-Wmissing-braces"))
762 warn_missing_braces = 1;
763 else if (!strcmp (p, "-Wno-missing-braces"))
764 warn_missing_braces = 0;
765 else if (!strcmp (p, "-Wmain"))
767 else if (!strcmp (p, "-Wno-main"))
769 else if (!strcmp (p, "-Wsign-compare"))
770 warn_sign_compare = 1;
771 else if (!strcmp (p, "-Wno-sign-compare"))
772 warn_sign_compare = 0;
773 else if (!strcmp (p, "-Wunknown-pragmas"))
774 /* Set to greater than 1, so that even unknown pragmas in system
775 headers will be warned about. */
776 warn_unknown_pragmas = 2;
777 else if (!strcmp (p, "-Wno-unknown-pragmas"))
778 warn_unknown_pragmas = 0;
779 else if (!strcmp (p, "-Wall"))
781 /* We save the value of warn_uninitialized, since if they put
782 -Wuninitialized on the command line, we need to generate a
783 warning about not using it without also specifying -O. */
784 if (warn_uninitialized != 1)
785 warn_uninitialized = 2;
786 warn_implicit_int = 1;
787 mesg_implicit_function_declaration = 1;
788 warn_return_type = 1;
792 warn_char_subscripts = 1;
793 warn_parentheses = 1;
794 warn_missing_braces = 1;
795 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
796 it off only if it's not explicit. */
798 /* Only warn about unknown pragmas that are not in system headers. */
799 warn_unknown_pragmas = 1;
807 /* Hooks for print_node. */
810 print_lang_decl (file, node, indent)
811 FILE *file ATTRIBUTE_UNUSED;
812 tree node ATTRIBUTE_UNUSED;
813 int indent ATTRIBUTE_UNUSED;
818 print_lang_type (file, node, indent)
819 FILE *file ATTRIBUTE_UNUSED;
820 tree node ATTRIBUTE_UNUSED;
821 int indent ATTRIBUTE_UNUSED;
826 print_lang_identifier (file, node, indent)
831 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
832 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
833 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
834 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
835 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
836 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
839 /* Hook called at end of compilation to assume 1 elt
840 for a top-level array decl that wasn't complete before. */
843 finish_incomplete_decl (decl)
846 if (TREE_CODE (decl) == VAR_DECL)
848 tree type = TREE_TYPE (decl);
849 if (type != error_mark_node
850 && TREE_CODE (type) == ARRAY_TYPE
851 && TYPE_DOMAIN (type) == 0)
853 if (! DECL_EXTERNAL (decl))
854 warning_with_decl (decl, "array `%s' assumed to have one element");
856 complete_array_type (type, NULL_TREE, 1);
858 layout_decl (decl, 0);
863 /* Create a new `struct binding_level'. */
866 struct binding_level *
867 make_binding_level ()
870 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
873 /* Nonzero if we are currently in the global binding level. */
878 return current_binding_level == global_binding_level;
884 keep_next_level_flag = 1;
887 /* Nonzero if the current level needs to have a BLOCK made. */
892 return ((current_binding_level->keep_if_subblocks
893 && current_binding_level->blocks != 0)
894 || current_binding_level->keep
895 || current_binding_level->names != 0
896 || (current_binding_level->tags != 0
897 && !current_binding_level->tag_transparent));
900 /* Identify this binding level as a level of parameters.
901 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
902 But it turns out there is no way to pass the right value for
903 DEFINITION_FLAG, so we ignore it. */
906 declare_parm_level (definition_flag)
909 current_binding_level->parm_flag = 1;
912 /* Nonzero if currently making parm declarations. */
917 return current_binding_level->parm_flag;
920 /* Enter a new binding level.
921 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
922 not for that of tags. */
925 pushlevel (tag_transparent)
928 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
930 /* If this is the top level of a function,
931 just make sure that NAMED_LABELS is 0. */
933 if (current_binding_level == global_binding_level)
938 /* Reuse or create a struct for this binding level. */
940 if (free_binding_level)
942 newlevel = free_binding_level;
943 free_binding_level = free_binding_level->level_chain;
947 newlevel = make_binding_level ();
950 /* Add this level to the front of the chain (stack) of levels that
953 *newlevel = clear_binding_level;
954 newlevel->tag_transparent
956 || (current_binding_level
957 ? current_binding_level->subblocks_tag_transparent
959 newlevel->level_chain = current_binding_level;
960 current_binding_level = newlevel;
961 newlevel->keep = keep_next_level_flag;
962 keep_next_level_flag = 0;
963 newlevel->keep_if_subblocks = keep_next_if_subblocks;
964 keep_next_if_subblocks = 0;
967 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
970 clear_limbo_values (block)
975 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
976 if (DECL_NAME (tem) != 0)
977 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
979 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
980 clear_limbo_values (tem);
983 /* Exit a binding level.
984 Pop the level off, and restore the state of the identifier-decl mappings
985 that were in effect when this level was entered.
987 If KEEP is nonzero, this level had explicit declarations, so
988 and create a "block" (a BLOCK node) for the level
989 to record its declarations and subblocks for symbol table output.
991 If FUNCTIONBODY is nonzero, this level is the body of a function,
992 so create a block as if KEEP were set and also clear out all
995 If REVERSE is nonzero, reverse the order of decls before putting
996 them into the BLOCK. */
999 poplevel (keep, reverse, functionbody)
1005 /* The chain of decls was accumulated in reverse order.
1006 Put it into forward order, just for cleanliness. */
1008 tree tags = current_binding_level->tags;
1009 tree subblocks = current_binding_level->blocks;
1012 int block_previously_created;
1014 keep |= current_binding_level->keep;
1016 /* This warning is turned off because it causes warnings for
1017 declarations like `extern struct foo *x'. */
1019 /* Warn about incomplete structure types in this level. */
1020 for (link = tags; link; link = TREE_CHAIN (link))
1021 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1023 tree type = TREE_VALUE (link);
1025 switch (TREE_CODE (type))
1028 errmsg = "`struct %s' incomplete in scope ending here";
1031 errmsg = "`union %s' incomplete in scope ending here";
1034 errmsg = "`enum %s' incomplete in scope ending here";
1037 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1038 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1040 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1041 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1045 /* Get the decls in the order they were written.
1046 Usually current_binding_level->names is in reverse order.
1047 But parameter decls were previously put in forward order. */
1050 current_binding_level->names
1051 = decls = nreverse (current_binding_level->names);
1053 decls = current_binding_level->names;
1055 /* Output any nested inline functions within this block
1056 if they weren't already output. */
1058 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1059 if (TREE_CODE (decl) == FUNCTION_DECL
1060 && ! TREE_ASM_WRITTEN (decl)
1061 && DECL_INITIAL (decl) != 0
1062 && TREE_ADDRESSABLE (decl))
1064 /* If this decl was copied from a file-scope decl
1065 on account of a block-scope extern decl,
1066 propagate TREE_ADDRESSABLE to the file-scope decl.
1068 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1069 true, since then the decl goes through save_for_inline_copying. */
1070 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1071 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1072 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1073 else if (DECL_SAVED_INSNS (decl) != 0)
1075 push_function_context ();
1076 output_inline_function (decl);
1077 pop_function_context ();
1081 /* If there were any declarations or structure tags in that level,
1082 or if this level is a function body,
1083 create a BLOCK to record them for the life of this function. */
1086 block_previously_created = (current_binding_level->this_block != 0);
1087 if (block_previously_created)
1088 block = current_binding_level->this_block;
1089 else if (keep || functionbody
1090 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1091 block = make_node (BLOCK);
1094 BLOCK_VARS (block) = decls;
1095 BLOCK_TYPE_TAGS (block) = tags;
1096 BLOCK_SUBBLOCKS (block) = subblocks;
1097 remember_end_note (block);
1100 /* In each subblock, record that this is its superior. */
1102 for (link = subblocks; link; link = TREE_CHAIN (link))
1103 BLOCK_SUPERCONTEXT (link) = block;
1105 /* Clear out the meanings of the local variables of this level. */
1107 for (link = decls; link; link = TREE_CHAIN (link))
1109 if (DECL_NAME (link) != 0)
1111 /* If the ident. was used or addressed via a local extern decl,
1112 don't forget that fact. */
1113 if (DECL_EXTERNAL (link))
1115 if (TREE_USED (link))
1116 TREE_USED (DECL_NAME (link)) = 1;
1117 if (TREE_ADDRESSABLE (link))
1118 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1120 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1124 /* Restore all name-meanings of the outer levels
1125 that were shadowed by this level. */
1127 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1128 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1130 /* If the level being exited is the top level of a function,
1131 check over all the labels, and clear out the current
1132 (function local) meanings of their names. */
1136 clear_limbo_values (block);
1138 /* If this is the top level block of a function,
1139 the vars are the function's parameters.
1140 Don't leave them in the BLOCK because they are
1141 found in the FUNCTION_DECL instead. */
1143 BLOCK_VARS (block) = 0;
1145 /* Clear out the definitions of all label names,
1146 since their scopes end here,
1147 and add them to BLOCK_VARS. */
1149 for (link = named_labels; link; link = TREE_CHAIN (link))
1151 register tree label = TREE_VALUE (link);
1153 if (DECL_INITIAL (label) == 0)
1155 error_with_decl (label, "label `%s' used but not defined");
1156 /* Avoid crashing later. */
1157 define_label (input_filename, lineno,
1160 else if (warn_unused && !TREE_USED (label))
1161 warning_with_decl (label, "label `%s' defined but not used");
1162 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1164 /* Put the labels into the "variables" of the
1165 top-level block, so debugger can see them. */
1166 TREE_CHAIN (label) = BLOCK_VARS (block);
1167 BLOCK_VARS (block) = label;
1171 /* Pop the current level, and free the structure for reuse. */
1174 register struct binding_level *level = current_binding_level;
1175 current_binding_level = current_binding_level->level_chain;
1177 level->level_chain = free_binding_level;
1178 free_binding_level = level;
1181 /* Dispose of the block that we just made inside some higher level. */
1183 DECL_INITIAL (current_function_decl) = block;
1186 if (!block_previously_created)
1187 current_binding_level->blocks
1188 = chainon (current_binding_level->blocks, block);
1190 /* If we did not make a block for the level just exited,
1191 any blocks made for inner levels
1192 (since they cannot be recorded as subblocks in that level)
1193 must be carried forward so they will later become subblocks
1194 of something else. */
1196 current_binding_level->blocks
1197 = chainon (current_binding_level->blocks, subblocks);
1199 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1200 binding contour so that they point to the appropriate construct, i.e.
1201 either to the current FUNCTION_DECL node, or else to the BLOCK node
1202 we just constructed.
1204 Note that for tagged types whose scope is just the formal parameter
1205 list for some function type specification, we can't properly set
1206 their TYPE_CONTEXTs here, because we don't have a pointer to the
1207 appropriate FUNCTION_TYPE node readily available to us. For those
1208 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1209 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1210 node which will represent the "scope" for these "parameter list local"
1215 for (link = tags; link; link = TREE_CHAIN (link))
1216 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1218 for (link = tags; link; link = TREE_CHAIN (link))
1219 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1222 TREE_USED (block) = 1;
1226 /* Delete the node BLOCK from the current binding level.
1227 This is used for the block inside a stmt expr ({...})
1228 so that the block can be reinserted where appropriate. */
1231 delete_block (block)
1235 if (current_binding_level->blocks == block)
1236 current_binding_level->blocks = TREE_CHAIN (block);
1237 for (t = current_binding_level->blocks; t;)
1239 if (TREE_CHAIN (t) == block)
1240 TREE_CHAIN (t) = TREE_CHAIN (block);
1244 TREE_CHAIN (block) = NULL;
1245 /* Clear TREE_USED which is always set by poplevel.
1246 The flag is set again if insert_block is called. */
1247 TREE_USED (block) = 0;
1250 /* Insert BLOCK at the end of the list of subblocks of the
1251 current binding level. This is used when a BIND_EXPR is expanded,
1252 to handle the BLOCK node inside the BIND_EXPR. */
1255 insert_block (block)
1258 TREE_USED (block) = 1;
1259 current_binding_level->blocks
1260 = chainon (current_binding_level->blocks, block);
1263 /* Set the BLOCK node for the innermost scope
1264 (the one we are currently in). */
1268 register tree block;
1270 current_binding_level->this_block = block;
1276 register struct binding_level *newlevel;
1278 /* Reuse or create a struct for this binding level. */
1280 if (free_binding_level)
1282 newlevel = free_binding_level;
1283 free_binding_level = free_binding_level->level_chain;
1287 newlevel = make_binding_level ();
1290 /* Add this level to the front of the chain (stack) of label levels. */
1292 newlevel->level_chain = label_level_chain;
1293 label_level_chain = newlevel;
1295 newlevel->names = named_labels;
1296 newlevel->shadowed = shadowed_labels;
1298 shadowed_labels = 0;
1304 register struct binding_level *level = label_level_chain;
1307 /* Clear out the definitions of the declared labels in this level.
1308 Leave in the list any ordinary, non-declared labels. */
1309 for (link = named_labels, prev = 0; link;)
1311 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1313 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1315 error_with_decl (TREE_VALUE (link),
1316 "label `%s' used but not defined");
1317 /* Avoid crashing later. */
1318 define_label (input_filename, lineno,
1319 DECL_NAME (TREE_VALUE (link)));
1321 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1322 warning_with_decl (TREE_VALUE (link),
1323 "label `%s' defined but not used");
1324 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1326 /* Delete this element from the list. */
1327 link = TREE_CHAIN (link);
1329 TREE_CHAIN (prev) = link;
1331 named_labels = link;
1336 link = TREE_CHAIN (link);
1340 /* Bring back all the labels that were shadowed. */
1341 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1342 if (DECL_NAME (TREE_VALUE (link)) != 0)
1343 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1344 = TREE_VALUE (link);
1346 named_labels = chainon (named_labels, level->names);
1347 shadowed_labels = level->shadowed;
1349 /* Pop the current level, and free the structure for reuse. */
1350 label_level_chain = label_level_chain->level_chain;
1351 level->level_chain = free_binding_level;
1352 free_binding_level = level;
1355 /* Push a definition or a declaration of struct, union or enum tag "name".
1356 "type" should be the type node.
1357 We assume that the tag "name" is not already defined.
1359 Note that the definition may really be just a forward reference.
1360 In that case, the TYPE_SIZE will be zero. */
1363 pushtag (name, type)
1366 register struct binding_level *b;
1368 /* Find the proper binding level for this type tag. */
1370 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1375 /* Record the identifier as the type's name if it has none. */
1377 if (TYPE_NAME (type) == 0)
1378 TYPE_NAME (type) = name;
1381 if (b == global_binding_level)
1382 b->tags = perm_tree_cons (name, type, b->tags);
1384 b->tags = saveable_tree_cons (name, type, b->tags);
1386 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1387 tagged type we just added to the current binding level. This fake
1388 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1389 to output a representation of a tagged type, and it also gives
1390 us a convenient place to record the "scope start" address for the
1393 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1395 /* An approximation for now, so we can tell this is a function-scope tag.
1396 This will be updated in poplevel. */
1397 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1400 /* Handle when a new declaration NEWDECL
1401 has the same name as an old one OLDDECL
1402 in the same binding contour.
1403 Prints an error message if appropriate.
1405 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1406 Otherwise, return 0.
1408 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1409 and OLDDECL is in an outer binding level and should thus not be changed. */
1412 duplicate_decls (newdecl, olddecl, different_binding_level)
1413 register tree newdecl, olddecl;
1414 int different_binding_level;
1416 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1417 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1418 && DECL_INITIAL (newdecl) != 0);
1419 tree oldtype = TREE_TYPE (olddecl);
1420 tree newtype = TREE_TYPE (newdecl);
1423 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1424 DECL_MACHINE_ATTRIBUTES (newdecl)
1425 = merge_machine_decl_attributes (olddecl, newdecl);
1427 if (TREE_CODE (newtype) == ERROR_MARK
1428 || TREE_CODE (oldtype) == ERROR_MARK)
1431 /* New decl is completely inconsistent with the old one =>
1432 tell caller to replace the old one.
1433 This is always an error except in the case of shadowing a builtin. */
1434 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1436 if (TREE_CODE (olddecl) == FUNCTION_DECL
1437 && (DECL_BUILT_IN (olddecl)
1438 || DECL_BUILT_IN_NONANSI (olddecl)))
1440 /* If you declare a built-in or predefined function name as static,
1441 the old definition is overridden,
1442 but optionally warn this was a bad choice of name. */
1443 if (!TREE_PUBLIC (newdecl))
1447 else if (DECL_BUILT_IN (olddecl))
1448 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1450 warning_with_decl (newdecl, "shadowing library function `%s'");
1452 /* Likewise, if the built-in is not ansi, then programs can
1453 override it even globally without an error. */
1454 else if (! DECL_BUILT_IN (olddecl))
1455 warning_with_decl (newdecl,
1456 "library function `%s' declared as non-function");
1458 else if (DECL_BUILT_IN_NONANSI (olddecl))
1459 warning_with_decl (newdecl,
1460 "built-in function `%s' declared as non-function");
1462 warning_with_decl (newdecl,
1463 "built-in function `%s' declared as non-function");
1467 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1468 error_with_decl (olddecl, "previous declaration of `%s'");
1474 /* For real parm decl following a forward decl,
1475 return 1 so old decl will be reused. */
1476 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1477 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1480 /* The new declaration is the same kind of object as the old one.
1481 The declarations may partially match. Print warnings if they don't
1482 match enough. Ultimately, copy most of the information from the new
1483 decl to the old one, and keep using the old one. */
1485 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1486 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1487 && DECL_INITIAL (olddecl) == 0)
1488 /* If -traditional, avoid error for redeclaring fcn
1489 after implicit decl. */
1491 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1492 && DECL_BUILT_IN (olddecl))
1494 /* A function declaration for a built-in function. */
1495 if (!TREE_PUBLIC (newdecl))
1497 /* If you declare a built-in function name as static, the
1498 built-in definition is overridden,
1499 but optionally warn this was a bad choice of name. */
1501 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1502 /* Discard the old built-in function. */
1505 else if (!types_match)
1507 /* Accept the return type of the new declaration if same modes. */
1508 tree oldreturntype = TREE_TYPE (oldtype);
1509 tree newreturntype = TREE_TYPE (newtype);
1511 /* Make sure we put the new type in the same obstack as the old ones.
1512 If the old types are not both in the same obstack, use the
1514 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1515 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1518 push_obstacks_nochange ();
1519 end_temporary_allocation ();
1522 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1524 /* Function types may be shared, so we can't just modify
1525 the return type of olddecl's function type. */
1527 = build_function_type (newreturntype,
1528 TYPE_ARG_TYPES (oldtype));
1530 types_match = comptypes (newtype, trytype);
1534 /* Accept harmless mismatch in first argument type also.
1536 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1537 && TYPE_ARG_TYPES (oldtype) != 0
1538 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1539 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1540 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1541 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1543 /* Function types may be shared, so we can't just modify
1544 the return type of olddecl's function type. */
1546 = build_function_type (TREE_TYPE (oldtype),
1547 tree_cons (NULL_TREE,
1548 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1549 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1551 types_match = comptypes (newtype, trytype);
1555 if (! different_binding_level)
1556 TREE_TYPE (olddecl) = oldtype;
1562 /* If types don't match for a built-in, throw away the built-in. */
1563 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1567 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1568 && DECL_SOURCE_LINE (olddecl) == 0)
1570 /* A function declaration for a predeclared function
1571 that isn't actually built in. */
1572 if (!TREE_PUBLIC (newdecl))
1574 /* If you declare it as static, the
1575 default definition is overridden. */
1578 else if (!types_match)
1580 /* If the types don't match, preserve volatility indication.
1581 Later on, we will discard everything else about the
1582 default declaration. */
1583 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1586 /* Permit char *foo () to match void *foo (...) if not pedantic,
1587 if one of them came from a system header file. */
1588 else if (!types_match
1589 && TREE_CODE (olddecl) == FUNCTION_DECL
1590 && TREE_CODE (newdecl) == FUNCTION_DECL
1591 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1592 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1593 && (DECL_IN_SYSTEM_HEADER (olddecl)
1594 || DECL_IN_SYSTEM_HEADER (newdecl))
1595 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1596 && TYPE_ARG_TYPES (oldtype) == 0
1597 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1598 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1600 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1601 && TYPE_ARG_TYPES (newtype) == 0
1602 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1603 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1606 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1607 /* Make sure we keep void * as ret type, not char *. */
1608 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1609 TREE_TYPE (newdecl) = newtype = oldtype;
1611 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1612 we will come back here again. */
1613 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1615 else if (!types_match
1616 /* Permit char *foo (int, ...); followed by char *foo ();
1618 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1620 /* Return types must still match. */
1621 && comptypes (TREE_TYPE (oldtype),
1622 TREE_TYPE (newtype))
1623 && TYPE_ARG_TYPES (newtype) == 0))
1625 error_with_decl (newdecl, "conflicting types for `%s'");
1626 /* Check for function type mismatch
1627 involving an empty arglist vs a nonempty one. */
1628 if (TREE_CODE (olddecl) == FUNCTION_DECL
1629 && comptypes (TREE_TYPE (oldtype),
1630 TREE_TYPE (newtype))
1631 && ((TYPE_ARG_TYPES (oldtype) == 0
1632 && DECL_INITIAL (olddecl) == 0)
1634 (TYPE_ARG_TYPES (newtype) == 0
1635 && DECL_INITIAL (newdecl) == 0)))
1637 /* Classify the problem further. */
1638 register tree t = TYPE_ARG_TYPES (oldtype);
1640 t = TYPE_ARG_TYPES (newtype);
1641 for (; t; t = TREE_CHAIN (t))
1643 register tree type = TREE_VALUE (t);
1645 if (TREE_CHAIN (t) == 0
1646 && TYPE_MAIN_VARIANT (type) != void_type_node)
1648 error ("A parameter list with an ellipsis can't match");
1649 error ("an empty parameter name list declaration.");
1653 if (TYPE_MAIN_VARIANT (type) == float_type_node
1654 || C_PROMOTING_INTEGER_TYPE_P (type))
1656 error ("An argument type that has a default promotion");
1657 error ("can't match an empty parameter name list declaration.");
1662 error_with_decl (olddecl, "previous declaration of `%s'");
1666 errmsg = redeclaration_error_message (newdecl, olddecl);
1669 error_with_decl (newdecl, errmsg);
1670 error_with_decl (olddecl,
1671 ((DECL_INITIAL (olddecl)
1672 && current_binding_level == global_binding_level)
1673 ? "`%s' previously defined here"
1674 : "`%s' previously declared here"));
1676 else if (TREE_CODE (newdecl) == TYPE_DECL
1677 && (DECL_IN_SYSTEM_HEADER (olddecl)
1678 || DECL_IN_SYSTEM_HEADER (newdecl)))
1680 warning_with_decl (newdecl, "redefinition of `%s'");
1683 ((DECL_INITIAL (olddecl)
1684 && current_binding_level == global_binding_level)
1685 ? "`%s' previously defined here"
1686 : "`%s' previously declared here"));
1688 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1689 && DECL_INITIAL (olddecl) != 0
1690 && TYPE_ARG_TYPES (oldtype) == 0
1691 && TYPE_ARG_TYPES (newtype) != 0
1692 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1694 register tree type, parm;
1696 /* Prototype decl follows defn w/o prototype. */
1698 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1699 type = TYPE_ARG_TYPES (newtype),
1701 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1702 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1703 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1705 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1706 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1708 errmsg = "prototype for `%s' follows and number of arguments";
1711 /* Type for passing arg must be consistent
1712 with that declared for the arg. */
1713 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1714 /* If -traditional, allow `unsigned int' instead of `int'
1715 in the prototype. */
1716 && (! (flag_traditional
1717 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1718 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1720 errmsg = "prototype for `%s' follows and argument %d";
1726 error_with_decl (newdecl, errmsg, nargs);
1727 error_with_decl (olddecl,
1728 "doesn't match non-prototype definition here");
1732 warning_with_decl (newdecl, "prototype for `%s' follows");
1733 warning_with_decl (olddecl, "non-prototype definition here");
1736 /* Warn about mismatches in various flags. */
1739 /* Warn if function is now inline
1740 but was previously declared not inline and has been called. */
1741 if (TREE_CODE (olddecl) == FUNCTION_DECL
1742 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1743 && TREE_USED (olddecl))
1744 warning_with_decl (newdecl,
1745 "`%s' declared inline after being called");
1746 if (TREE_CODE (olddecl) == FUNCTION_DECL
1747 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1748 && DECL_INITIAL (olddecl) != 0)
1749 warning_with_decl (newdecl,
1750 "`%s' declared inline after its definition");
1752 /* If pedantic, warn when static declaration follows a non-static
1753 declaration. Otherwise, do so only for functions. */
1754 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1755 && TREE_PUBLIC (olddecl)
1756 && !TREE_PUBLIC (newdecl))
1757 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1759 /* Warn when const declaration follows a non-const
1760 declaration, but not for functions. */
1761 if (TREE_CODE (olddecl) != FUNCTION_DECL
1762 && !TREE_READONLY (olddecl)
1763 && TREE_READONLY (newdecl))
1764 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1765 /* These bits are logically part of the type, for variables.
1766 But not for functions
1767 (where qualifiers are not valid ANSI anyway). */
1768 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1769 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1770 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1771 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1775 /* Optionally warn about more than one declaration for the same name. */
1776 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1777 /* Don't warn about a function declaration
1778 followed by a definition. */
1779 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1780 && DECL_INITIAL (olddecl) == 0)
1781 /* Don't warn about extern decl followed by (tentative) definition. */
1782 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1784 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1785 warning_with_decl (olddecl, "previous declaration of `%s'");
1788 /* Copy all the DECL_... slots specified in the new decl
1789 except for any that we copy here from the old type.
1791 Past this point, we don't change OLDTYPE and NEWTYPE
1792 even if we change the types of NEWDECL and OLDDECL. */
1796 /* When copying info to olddecl, we store into write_olddecl
1797 instead. This allows us to avoid modifying olddecl when
1798 different_binding_level is true. */
1799 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1801 /* Make sure we put the new type in the same obstack as the old ones.
1802 If the old types are not both in the same obstack, use the permanent
1804 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1805 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1808 push_obstacks_nochange ();
1809 end_temporary_allocation ();
1812 /* Merge the data types specified in the two decls. */
1813 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1815 if (different_binding_level)
1817 = build_type_attribute_variant
1819 merge_attributes (TYPE_ATTRIBUTES (newtype),
1820 TYPE_ATTRIBUTES (oldtype)));
1823 = TREE_TYPE (olddecl)
1824 = common_type (newtype, oldtype);
1827 /* Lay the type out, unless already done. */
1828 if (oldtype != TREE_TYPE (newdecl))
1830 if (TREE_TYPE (newdecl) != error_mark_node)
1831 layout_type (TREE_TYPE (newdecl));
1832 if (TREE_CODE (newdecl) != FUNCTION_DECL
1833 && TREE_CODE (newdecl) != TYPE_DECL
1834 && TREE_CODE (newdecl) != CONST_DECL)
1835 layout_decl (newdecl, 0);
1839 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1840 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1841 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1842 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1843 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1846 /* Keep the old rtl since we can safely use it. */
1847 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1849 /* Merge the type qualifiers. */
1850 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1851 && !TREE_THIS_VOLATILE (newdecl))
1852 TREE_THIS_VOLATILE (write_olddecl) = 0;
1853 if (TREE_READONLY (newdecl))
1854 TREE_READONLY (write_olddecl) = 1;
1855 if (TREE_THIS_VOLATILE (newdecl))
1857 TREE_THIS_VOLATILE (write_olddecl) = 1;
1858 if (TREE_CODE (newdecl) == VAR_DECL)
1859 make_var_volatile (newdecl);
1862 /* Keep source location of definition rather than declaration. */
1863 /* When called with different_binding_level set, keep the old
1864 information so that meaningful diagnostics can be given. */
1865 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1866 && ! different_binding_level)
1868 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1869 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1872 /* Merge the unused-warning information. */
1873 if (DECL_IN_SYSTEM_HEADER (olddecl))
1874 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1875 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1876 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1878 /* Merge the initialization information. */
1879 /* When called with different_binding_level set, don't copy over
1880 DECL_INITIAL, so that we don't accidentally change function
1881 declarations into function definitions. */
1882 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1883 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1885 /* Merge the section attribute.
1886 We want to issue an error if the sections conflict but that must be
1887 done later in decl_attributes since we are called before attributes
1889 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1890 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1892 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1894 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1895 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1900 /* If cannot merge, then use the new type and qualifiers,
1901 and don't preserve the old rtl. */
1902 else if (! different_binding_level)
1904 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1905 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1906 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1907 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1910 /* Merge the storage class information. */
1911 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1912 /* For functions, static overrides non-static. */
1913 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1915 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1916 /* This is since we don't automatically
1917 copy the attributes of NEWDECL into OLDDECL. */
1918 /* No need to worry about different_binding_level here because
1919 then TREE_PUBLIC (newdecl) was true. */
1920 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1921 /* If this clears `static', clear it in the identifier too. */
1922 if (! TREE_PUBLIC (olddecl))
1923 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1925 if (DECL_EXTERNAL (newdecl))
1927 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1928 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1929 /* An extern decl does not override previous storage class. */
1930 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1931 if (! DECL_EXTERNAL (newdecl))
1932 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1936 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1937 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1940 /* If either decl says `inline', this fn is inline,
1941 unless its definition was passed already. */
1942 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1943 DECL_INLINE (olddecl) = 1;
1944 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1946 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1948 if (DECL_BUILT_IN (olddecl))
1950 /* Get rid of any built-in function if new arg types don't match it
1951 or if we have a function definition. */
1952 if (! types_match || new_is_definition)
1954 if (! different_binding_level)
1956 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1957 DECL_BUILT_IN (olddecl) = 0;
1962 /* If redeclaring a builtin function, and not a definition,
1963 it stays built in. */
1964 DECL_BUILT_IN (newdecl) = 1;
1965 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1968 /* Also preserve various other info from the definition. */
1969 else if (! new_is_definition)
1970 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1971 if (! new_is_definition)
1973 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1974 /* When called with different_binding_level set, don't copy over
1975 DECL_INITIAL, so that we don't accidentally change function
1976 declarations into function definitions. */
1977 if (! different_binding_level)
1978 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1979 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1980 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1981 if (DECL_INLINE (newdecl))
1982 DECL_ABSTRACT_ORIGIN (newdecl) = olddecl;
1985 if (different_binding_level)
1987 /* Don't output a duplicate symbol or debugging information for this
1989 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
1993 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1994 But preserve OLDDECL's DECL_UID. */
1996 register unsigned olddecl_uid = DECL_UID (olddecl);
1998 bcopy ((char *) newdecl + sizeof (struct tree_common),
1999 (char *) olddecl + sizeof (struct tree_common),
2000 sizeof (struct tree_decl) - sizeof (struct tree_common));
2001 DECL_UID (olddecl) = olddecl_uid;
2004 /* NEWDECL contains the merged attribute lists.
2005 Update OLDDECL to be the same. */
2006 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2011 /* Record a decl-node X as belonging to the current lexical scope.
2012 Check for errors (such as an incompatible declaration for the same
2013 name already seen in the same scope).
2015 Returns either X or an old decl for the same name.
2016 If an old decl is returned, it may have been smashed
2017 to agree with what X says. */
2024 register tree name = DECL_NAME (x);
2025 register struct binding_level *b = current_binding_level;
2027 DECL_CONTEXT (x) = current_function_decl;
2028 /* A local extern declaration for a function doesn't constitute nesting.
2029 A local auto declaration does, since it's a forward decl
2030 for a nested function coming later. */
2031 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2032 && DECL_EXTERNAL (x))
2033 DECL_CONTEXT (x) = 0;
2035 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2036 && x != IDENTIFIER_IMPLICIT_DECL (name)
2037 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2038 && !DECL_IN_SYSTEM_HEADER (x))
2039 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2045 int different_binding_level = 0;
2047 t = lookup_name_current_level (name);
2048 /* Don't type check externs here when -traditional. This is so that
2049 code with conflicting declarations inside blocks will get warnings
2050 not errors. X11 for instance depends on this. */
2051 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2053 t = IDENTIFIER_GLOBAL_VALUE (name);
2054 /* Type decls at global scope don't conflict with externs declared
2055 inside lexical blocks. */
2056 if (t && TREE_CODE (t) == TYPE_DECL)
2058 different_binding_level = 1;
2060 if (t != 0 && t == error_mark_node)
2061 /* error_mark_node is 0 for a while during initialization! */
2064 error_with_decl (x, "`%s' used prior to declaration");
2069 file = DECL_SOURCE_FILE (t);
2070 line = DECL_SOURCE_LINE (t);
2073 /* If this decl is `static' and an implicit decl was seen previously,
2074 warn. But don't complain if -traditional,
2075 since traditional compilers don't complain. */
2076 if (! flag_traditional && TREE_PUBLIC (name)
2077 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2078 sets this for all functions. */
2079 && ! TREE_PUBLIC (x)
2080 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2081 /* We used to warn also for explicit extern followed by static,
2082 but sometimes you need to do it that way. */
2083 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2085 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2086 IDENTIFIER_POINTER (name));
2087 pedwarn_with_file_and_line
2088 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2089 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2090 "previous declaration of `%s'",
2091 IDENTIFIER_POINTER (name));
2092 TREE_THIS_VOLATILE (name) = 1;
2095 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2097 if (TREE_CODE (t) == PARM_DECL)
2099 /* Don't allow more than one "real" duplicate
2100 of a forward parm decl. */
2101 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2107 /* If we are processing a typedef statement, generate a whole new
2108 ..._TYPE node (which will be just an variant of the existing
2109 ..._TYPE node with identical properties) and then install the
2110 TYPE_DECL node generated to represent the typedef name as the
2111 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2113 The whole point here is to end up with a situation where each
2114 and every ..._TYPE node the compiler creates will be uniquely
2115 associated with AT MOST one node representing a typedef name.
2116 This way, even though the compiler substitutes corresponding
2117 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2118 early on, later parts of the compiler can always do the reverse
2119 translation and get back the corresponding typedef name. For
2122 typedef struct S MY_TYPE;
2125 Later parts of the compiler might only know that `object' was of
2126 type `struct S' if it were not for code just below. With this
2127 code however, later parts of the compiler see something like:
2129 struct S' == struct S
2130 typedef struct S' MY_TYPE;
2133 And they can then deduce (from the node for type struct S') that
2134 the original object declaration was:
2138 Being able to do this is important for proper support of protoize,
2139 and also for generating precise symbolic debugging information
2140 which takes full account of the programmer's (typedef) vocabulary.
2142 Obviously, we don't want to generate a duplicate ..._TYPE node if
2143 the TYPE_DECL node that we are now processing really represents a
2144 standard built-in type.
2146 Since all standard types are effectively declared at line zero
2147 in the source file, we can easily check to see if we are working
2148 on a standard type by checking the current value of lineno. */
2150 if (TREE_CODE (x) == TYPE_DECL)
2152 if (DECL_SOURCE_LINE (x) == 0)
2154 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2155 TYPE_NAME (TREE_TYPE (x)) = x;
2157 else if (TREE_TYPE (x) != error_mark_node
2158 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2160 tree tt = TREE_TYPE (x);
2161 DECL_ORIGINAL_TYPE (x) = tt;
2162 tt = build_type_copy (tt);
2168 /* Multiple external decls of the same identifier ought to match.
2169 Check against both global declarations (when traditional) and out of
2170 scope (limbo) block level declarations.
2172 We get warnings about inline functions where they are defined.
2173 Avoid duplicate warnings where they are used. */
2174 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2178 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2179 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2180 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2181 decl = IDENTIFIER_GLOBAL_VALUE (name);
2182 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2183 /* Decls in limbo are always extern, so no need to check that. */
2184 decl = IDENTIFIER_LIMBO_VALUE (name);
2188 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2189 /* If old decl is built-in, we already warned if we should. */
2190 && !DECL_BUILT_IN (decl))
2192 pedwarn_with_decl (x,
2193 "type mismatch with previous external decl");
2194 pedwarn_with_decl (decl, "previous external decl of `%s'");
2198 /* If a function has had an implicit declaration, and then is defined,
2199 make sure they are compatible. */
2201 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2202 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2203 && TREE_CODE (x) == FUNCTION_DECL
2204 && ! comptypes (TREE_TYPE (x),
2205 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2207 warning_with_decl (x, "type mismatch with previous implicit declaration");
2208 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2209 "previous implicit declaration of `%s'");
2212 /* In PCC-compatibility mode, extern decls of vars with no current decl
2213 take effect at top level no matter where they are. */
2214 if (flag_traditional && DECL_EXTERNAL (x)
2215 && lookup_name (name) == 0)
2217 tree type = TREE_TYPE (x);
2219 /* But don't do this if the type contains temporary nodes. */
2222 if (type == error_mark_node)
2224 if (! TREE_PERMANENT (type))
2226 warning_with_decl (x, "type of external `%s' is not global");
2227 /* By exiting the loop early, we leave TYPE nonzero,
2228 and thus prevent globalization of the decl. */
2231 else if (TREE_CODE (type) == FUNCTION_TYPE
2232 && TYPE_ARG_TYPES (type) != 0)
2233 /* The types might not be truly local,
2234 but the list of arg types certainly is temporary.
2235 Since prototypes are nontraditional,
2236 ok not to do the traditional thing. */
2238 type = TREE_TYPE (type);
2242 b = global_binding_level;
2245 /* This name is new in its binding level.
2246 Install the new declaration and return it. */
2247 if (b == global_binding_level)
2249 /* Install a global value. */
2251 /* If the first global decl has external linkage,
2252 warn if we later see static one. */
2253 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2254 TREE_PUBLIC (name) = 1;
2256 IDENTIFIER_GLOBAL_VALUE (name) = x;
2258 /* We no longer care about any previous block level declarations. */
2259 IDENTIFIER_LIMBO_VALUE (name) = 0;
2261 /* Don't forget if the function was used via an implicit decl. */
2262 if (IDENTIFIER_IMPLICIT_DECL (name)
2263 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2264 TREE_USED (x) = 1, TREE_USED (name) = 1;
2266 /* Don't forget if its address was taken in that way. */
2267 if (IDENTIFIER_IMPLICIT_DECL (name)
2268 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2269 TREE_ADDRESSABLE (x) = 1;
2271 /* Warn about mismatches against previous implicit decl. */
2272 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2273 /* If this real decl matches the implicit, don't complain. */
2274 && ! (TREE_CODE (x) == FUNCTION_DECL
2275 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2276 == integer_type_node)))
2277 pedwarn ("`%s' was previously implicitly declared to return `int'",
2278 IDENTIFIER_POINTER (name));
2280 /* If this decl is `static' and an `extern' was seen previously,
2281 that is erroneous. */
2282 if (TREE_PUBLIC (name)
2283 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2285 /* Okay to redeclare an ANSI built-in as static. */
2286 if (t != 0 && DECL_BUILT_IN (t))
2288 /* Okay to declare a non-ANSI built-in as anything. */
2289 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2291 /* Okay to have global type decl after an earlier extern
2292 declaration inside a lexical block. */
2293 else if (TREE_CODE (x) == TYPE_DECL)
2295 else if (IDENTIFIER_IMPLICIT_DECL (name))
2297 if (! TREE_THIS_VOLATILE (name))
2298 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2299 IDENTIFIER_POINTER (name));
2302 pedwarn ("`%s' was declared `extern' and later `static'",
2303 IDENTIFIER_POINTER (name));
2308 /* Here to install a non-global value. */
2309 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2310 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2311 IDENTIFIER_LOCAL_VALUE (name) = x;
2313 /* If this is an extern function declaration, see if we
2314 have a global definition or declaration for the function. */
2316 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2318 && TREE_CODE (x) == FUNCTION_DECL
2319 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2321 /* We have one. Their types must agree. */
2322 if (! comptypes (TREE_TYPE (x),
2323 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2324 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2327 /* Inner extern decl is inline if global one is.
2328 Copy enough to really inline it. */
2329 if (DECL_INLINE (oldglobal))
2331 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2332 DECL_INITIAL (x) = (current_function_decl == oldglobal
2333 ? 0 : DECL_INITIAL (oldglobal));
2334 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2335 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2336 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2337 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2338 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2339 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2341 /* Inner extern decl is built-in if global one is. */
2342 if (DECL_BUILT_IN (oldglobal))
2344 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2345 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2347 /* Keep the arg types from a file-scope fcn defn. */
2348 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2349 && DECL_INITIAL (oldglobal)
2350 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2351 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2355 #if 0 /* This case is probably sometimes the right thing to do. */
2356 /* If we have a local external declaration,
2357 then any file-scope declaration should not
2358 have been static. */
2359 if (oldlocal == 0 && oldglobal != 0
2360 && !TREE_PUBLIC (oldglobal)
2361 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2362 warning ("`%s' locally external but globally static",
2363 IDENTIFIER_POINTER (name));
2366 /* If we have a local external declaration,
2367 and no file-scope declaration has yet been seen,
2368 then if we later have a file-scope decl it must not be static. */
2370 && DECL_EXTERNAL (x)
2374 TREE_PUBLIC (name) = 1;
2376 /* Save this decl, so that we can do type checking against
2377 other decls after it falls out of scope.
2379 Only save it once. This prevents temporary decls created in
2380 expand_inline_function from being used here, since this
2381 will have been set when the inline function was parsed.
2382 It also helps give slightly better warnings. */
2383 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2384 IDENTIFIER_LIMBO_VALUE (name) = x;
2387 /* Warn if shadowing an argument at the top level of the body. */
2388 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2389 /* This warning doesn't apply to the parms of a nested fcn. */
2390 && ! current_binding_level->parm_flag
2391 /* Check that this is one level down from the parms. */
2392 && current_binding_level->level_chain->parm_flag
2393 /* Check that the decl being shadowed
2394 comes from the parm level, one level up. */
2395 && chain_member (oldlocal, current_binding_level->level_chain->names))
2397 if (TREE_CODE (oldlocal) == PARM_DECL)
2398 pedwarn ("declaration of `%s' shadows a parameter",
2399 IDENTIFIER_POINTER (name));
2401 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2402 IDENTIFIER_POINTER (name));
2405 /* Maybe warn if shadowing something else. */
2406 else if (warn_shadow && !DECL_EXTERNAL (x)
2407 /* No shadow warnings for internally generated vars. */
2408 && DECL_SOURCE_LINE (x) != 0
2409 /* No shadow warnings for vars made for inlining. */
2410 && ! DECL_FROM_INLINE (x))
2412 char *warnstring = 0;
2414 if (TREE_CODE (x) == PARM_DECL
2415 && current_binding_level->level_chain->parm_flag)
2416 /* Don't warn about the parm names in function declarator
2417 within a function declarator.
2418 It would be nice to avoid warning in any function
2419 declarator in a declaration, as opposed to a definition,
2420 but there is no way to tell it's not a definition. */
2422 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2423 warnstring = "declaration of `%s' shadows a parameter";
2424 else if (oldlocal != 0)
2425 warnstring = "declaration of `%s' shadows previous local";
2426 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2427 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2428 warnstring = "declaration of `%s' shadows global declaration";
2431 warning (warnstring, IDENTIFIER_POINTER (name));
2434 /* If storing a local value, there may already be one (inherited).
2435 If so, record it for restoration when this binding level ends. */
2437 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2440 /* Keep count of variables in this level with incomplete type. */
2441 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2445 /* Put decls on list in reverse order.
2446 We will reverse them later if necessary. */
2447 TREE_CHAIN (x) = b->names;
2453 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2456 pushdecl_top_level (x)
2460 register struct binding_level *b = current_binding_level;
2462 current_binding_level = global_binding_level;
2464 current_binding_level = b;
2468 /* Generate an implicit declaration for identifier FUNCTIONID
2469 as a function of type int (). Print a warning if appropriate. */
2472 implicitly_declare (functionid)
2476 int traditional_warning = 0;
2477 /* Only one "implicit declaration" warning per identifier. */
2478 int implicit_warning;
2480 /* Save the decl permanently so we can warn if definition follows. */
2481 push_obstacks_nochange ();
2482 end_temporary_allocation ();
2484 /* We used to reuse an old implicit decl here,
2485 but this loses with inline functions because it can clobber
2486 the saved decl chains. */
2487 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2488 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2490 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2492 /* Warn of implicit decl following explicit local extern decl.
2493 This is probably a program designed for traditional C. */
2494 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2495 traditional_warning = 1;
2497 /* Warn once of an implicit declaration. */
2498 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2500 DECL_EXTERNAL (decl) = 1;
2501 TREE_PUBLIC (decl) = 1;
2503 /* Record that we have an implicit decl and this is it. */
2504 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2506 /* ANSI standard says implicit declarations are in the innermost block.
2507 So we record the decl in the standard fashion.
2508 If flag_traditional is set, pushdecl does it top-level. */
2511 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2512 maybe_objc_check_decl (decl);
2514 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2516 if (mesg_implicit_function_declaration && implicit_warning)
2518 if (mesg_implicit_function_declaration == 2)
2519 error ("implicit declaration of function `%s'",
2520 IDENTIFIER_POINTER (functionid));
2522 warning ("implicit declaration of function `%s'",
2523 IDENTIFIER_POINTER (functionid));
2525 else if (warn_traditional && traditional_warning)
2526 warning ("function `%s' was previously declared within a block",
2527 IDENTIFIER_POINTER (functionid));
2529 /* Write a record describing this implicit function declaration to the
2530 prototypes file (if requested). */
2532 gen_aux_info_record (decl, 0, 1, 0);
2539 /* Return zero if the declaration NEWDECL is valid
2540 when the declaration OLDDECL (assumed to be for the same name)
2541 has already been seen.
2542 Otherwise return an error message format string with a %s
2543 where the identifier should go. */
2546 redeclaration_error_message (newdecl, olddecl)
2547 tree newdecl, olddecl;
2549 if (TREE_CODE (newdecl) == TYPE_DECL)
2551 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2553 /* pushdecl creates distinct types for TYPE_DECLs by calling
2554 build_type_copy, so the above comparison generally fails. We do
2555 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2556 is equivalent to what this code used to do before the build_type_copy
2557 call. The variant type distinction should not matter for traditional
2558 code, because it doesn't have type qualifiers. */
2559 if (flag_traditional
2560 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2562 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2564 return "redefinition of `%s'";
2566 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2568 /* Declarations of functions can insist on internal linkage
2569 but they can't be inconsistent with internal linkage,
2570 so there can be no error on that account.
2571 However defining the same name twice is no good. */
2572 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2573 /* However, defining once as extern inline and a second
2574 time in another way is ok. */
2575 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2576 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2577 return "redefinition of `%s'";
2580 else if (current_binding_level == global_binding_level)
2582 /* Objects declared at top level: */
2583 /* If at least one is a reference, it's ok. */
2584 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2586 /* Reject two definitions. */
2587 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2588 return "redefinition of `%s'";
2589 /* Now we have two tentative defs, or one tentative and one real def. */
2590 /* Insist that the linkage match. */
2591 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2592 return "conflicting declarations of `%s'";
2595 else if (current_binding_level->parm_flag
2596 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2600 /* Newdecl has block scope. If olddecl has block scope also, then
2601 reject two definitions, and reject a definition together with an
2602 external reference. Otherwise, it is OK, because newdecl must
2603 be an extern reference to olddecl. */
2604 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2605 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2606 return "redeclaration of `%s'";
2611 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2612 Create one if none exists so far for the current function.
2613 This function is called for both label definitions and label references. */
2619 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2621 if (current_function_decl == 0)
2623 error ("label %s referenced outside of any function",
2624 IDENTIFIER_POINTER (id));
2628 /* Use a label already defined or ref'd with this name. */
2631 /* But not if it is inherited and wasn't declared to be inheritable. */
2632 if (DECL_CONTEXT (decl) != current_function_decl
2633 && ! C_DECLARED_LABEL_FLAG (decl))
2634 return shadow_label (id);
2638 decl = build_decl (LABEL_DECL, id, void_type_node);
2640 /* Make sure every label has an rtx. */
2643 /* A label not explicitly declared must be local to where it's ref'd. */
2644 DECL_CONTEXT (decl) = current_function_decl;
2646 DECL_MODE (decl) = VOIDmode;
2648 /* Say where one reference is to the label,
2649 for the sake of the error if it is not defined. */
2650 DECL_SOURCE_LINE (decl) = lineno;
2651 DECL_SOURCE_FILE (decl) = input_filename;
2653 IDENTIFIER_LABEL_VALUE (id) = decl;
2655 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2660 /* Make a label named NAME in the current function,
2661 shadowing silently any that may be inherited from containing functions
2662 or containing scopes.
2664 Note that valid use, if the label being shadowed
2665 comes from another scope in the same function,
2666 requires calling declare_nonlocal_label right away. */
2672 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2678 /* Check to make sure that the label hasn't already been declared
2679 at this label scope */
2680 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2681 if (TREE_VALUE (dup) == decl)
2683 error ("duplicate label declaration `%s'",
2684 IDENTIFIER_POINTER (name));
2685 error_with_decl (TREE_VALUE (dup),
2686 "this is a previous declaration");
2687 /* Just use the previous declaration. */
2688 return lookup_label (name);
2691 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2692 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2695 return lookup_label (name);
2698 /* Define a label, specifying the location in the source file.
2699 Return the LABEL_DECL node for the label, if the definition is valid.
2700 Otherwise return 0. */
2703 define_label (filename, line, name)
2708 tree decl = lookup_label (name);
2710 /* If label with this name is known from an outer context, shadow it. */
2711 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2713 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2714 IDENTIFIER_LABEL_VALUE (name) = 0;
2715 decl = lookup_label (name);
2718 if (DECL_INITIAL (decl) != 0)
2720 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2725 /* Mark label as having been defined. */
2726 DECL_INITIAL (decl) = error_mark_node;
2727 /* Say where in the source. */
2728 DECL_SOURCE_FILE (decl) = filename;
2729 DECL_SOURCE_LINE (decl) = line;
2734 /* Return the list of declarations of the current level.
2735 Note that this list is in reverse order unless/until
2736 you nreverse it; and when you do nreverse it, you must
2737 store the result back using `storedecls' or you will lose. */
2742 return current_binding_level->names;
2745 /* Return the list of type-tags (for structs, etc) of the current level. */
2750 return current_binding_level->tags;
2753 /* Store the list of declarations of the current level.
2754 This is done for the parameter declarations of a function being defined,
2755 after they are modified in the light of any missing parameters. */
2761 current_binding_level->names = decls;
2764 /* Similarly, store the list of tags of the current level. */
2770 current_binding_level->tags = tags;
2773 /* Given NAME, an IDENTIFIER_NODE,
2774 return the structure (or union or enum) definition for that name.
2775 Searches binding levels from BINDING_LEVEL up to the global level.
2776 If THISLEVEL_ONLY is nonzero, searches only the specified context
2777 (but skips any tag-transparent contexts to find one that is
2778 meaningful for tags).
2779 CODE says which kind of type the caller wants;
2780 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2781 If the wrong kind of type is found, an error is reported. */
2784 lookup_tag (code, name, binding_level, thislevel_only)
2785 enum tree_code code;
2786 struct binding_level *binding_level;
2790 register struct binding_level *level;
2792 for (level = binding_level; level; level = level->level_chain)
2795 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2797 if (TREE_PURPOSE (tail) == name)
2799 if (TREE_CODE (TREE_VALUE (tail)) != code)
2801 /* Definition isn't the kind we were looking for. */
2802 pending_invalid_xref = name;
2803 pending_invalid_xref_file = input_filename;
2804 pending_invalid_xref_line = lineno;
2806 return TREE_VALUE (tail);
2809 if (thislevel_only && ! level->tag_transparent)
2815 /* Print an error message now
2816 for a recent invalid struct, union or enum cross reference.
2817 We don't print them immediately because they are not invalid
2818 when used in the `struct foo;' construct for shadowing. */
2821 pending_xref_error ()
2823 if (pending_invalid_xref != 0)
2824 error_with_file_and_line (pending_invalid_xref_file,
2825 pending_invalid_xref_line,
2826 "`%s' defined as wrong kind of tag",
2827 IDENTIFIER_POINTER (pending_invalid_xref));
2828 pending_invalid_xref = 0;
2831 /* Given a type, find the tag that was defined for it and return the tag name.
2832 Otherwise return 0. */
2835 lookup_tag_reverse (type)
2838 register struct binding_level *level;
2840 for (level = current_binding_level; level; level = level->level_chain)
2843 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2845 if (TREE_VALUE (tail) == type)
2846 return TREE_PURPOSE (tail);
2852 /* Look up NAME in the current binding level and its superiors
2853 in the namespace of variables, functions and typedefs.
2854 Return a ..._DECL node of some kind representing its definition,
2855 or return 0 if it is undefined. */
2862 if (current_binding_level != global_binding_level
2863 && IDENTIFIER_LOCAL_VALUE (name))
2864 val = IDENTIFIER_LOCAL_VALUE (name);
2866 val = IDENTIFIER_GLOBAL_VALUE (name);
2870 /* Similar to `lookup_name' but look only at current binding level. */
2873 lookup_name_current_level (name)
2878 if (current_binding_level == global_binding_level)
2879 return IDENTIFIER_GLOBAL_VALUE (name);
2881 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2884 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2885 if (DECL_NAME (t) == name)
2891 /* Create the predefined scalar types of C,
2892 and some nodes representing standard constants (0, 1, (void *) 0).
2893 Initialize the global binding level.
2894 Make definitions for built-in primitive functions. */
2897 init_decl_processing ()
2899 register tree endlink;
2900 /* Either char* or void*. */
2901 tree traditional_ptr_type_node;
2902 /* Data types of memcpy and strlen. */
2903 tree memcpy_ftype, memset_ftype, strlen_ftype;
2904 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2905 int wchar_type_size;
2907 tree array_domain_type;
2909 current_function_decl = NULL;
2910 named_labels = NULL;
2911 current_binding_level = NULL_BINDING_LEVEL;
2912 free_binding_level = NULL_BINDING_LEVEL;
2913 pushlevel (0); /* make the binding_level structure for global names */
2914 global_binding_level = current_binding_level;
2916 /* Define `int' and `char' first so that dbx will output them first. */
2918 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2919 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2920 integer_type_node));
2922 /* Define `char', which is like either `signed char' or `unsigned char'
2923 but not the same as either. */
2927 ? make_signed_type (CHAR_TYPE_SIZE)
2928 : make_unsigned_type (CHAR_TYPE_SIZE));
2929 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2932 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2933 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2934 long_integer_type_node));
2936 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2937 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2938 unsigned_type_node));
2940 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2941 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2942 long_unsigned_type_node));
2944 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2945 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2946 long_long_integer_type_node));
2948 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2949 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2950 long_long_unsigned_type_node));
2952 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2953 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2954 short_integer_type_node));
2956 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2957 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2958 short_unsigned_type_node));
2960 /* `unsigned long' is the standard type for sizeof.
2961 Traditionally, use a signed type.
2962 Note that stddef.h uses `unsigned long',
2963 and this must agree, even if long and int are the same size. */
2965 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2966 if (flag_traditional && TREE_UNSIGNED (sizetype))
2967 set_sizetype (signed_type (sizetype));
2970 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2972 error_mark_node = make_node (ERROR_MARK);
2973 TREE_TYPE (error_mark_node) = error_mark_node;
2975 /* Define both `signed char' and `unsigned char'. */
2976 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2977 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2978 signed_char_type_node));
2980 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2981 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2982 unsigned_char_type_node));
2984 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2985 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2987 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2988 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2990 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2991 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2993 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2994 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2996 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
2997 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2999 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3000 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3002 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3003 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3005 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3006 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3008 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3009 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3011 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3012 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3014 float_type_node = make_node (REAL_TYPE);
3015 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3016 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3018 layout_type (float_type_node);
3020 double_type_node = make_node (REAL_TYPE);
3021 if (flag_short_double)
3022 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3024 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3025 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3027 layout_type (double_type_node);
3029 long_double_type_node = make_node (REAL_TYPE);
3030 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3031 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3032 long_double_type_node));
3033 layout_type (long_double_type_node);
3035 complex_integer_type_node = make_node (COMPLEX_TYPE);
3036 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3037 complex_integer_type_node));
3038 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3039 layout_type (complex_integer_type_node);
3041 complex_float_type_node = make_node (COMPLEX_TYPE);
3042 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3043 complex_float_type_node));
3044 TREE_TYPE (complex_float_type_node) = float_type_node;
3045 layout_type (complex_float_type_node);
3047 complex_double_type_node = make_node (COMPLEX_TYPE);
3048 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3049 complex_double_type_node));
3050 TREE_TYPE (complex_double_type_node) = double_type_node;
3051 layout_type (complex_double_type_node);
3053 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3054 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3055 complex_long_double_type_node));
3056 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3057 layout_type (complex_long_double_type_node);
3060 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3061 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3062 signed_wchar_type_node = signed_type (wchar_type_node);
3063 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3065 integer_zero_node = build_int_2 (0, 0);
3066 TREE_TYPE (integer_zero_node) = integer_type_node;
3067 integer_one_node = build_int_2 (1, 0);
3068 TREE_TYPE (integer_one_node) = integer_type_node;
3070 boolean_type_node = integer_type_node;
3071 boolean_true_node = integer_one_node;
3072 boolean_false_node = integer_zero_node;
3074 size_zero_node = build_int_2 (0, 0);
3075 TREE_TYPE (size_zero_node) = sizetype;
3076 size_one_node = build_int_2 (1, 0);
3077 TREE_TYPE (size_one_node) = sizetype;
3079 void_type_node = make_node (VOID_TYPE);
3080 pushdecl (build_decl (TYPE_DECL,
3081 ridpointers[(int) RID_VOID], void_type_node));
3082 layout_type (void_type_node); /* Uses integer_zero_node */
3083 /* We are not going to have real types in C with less than byte alignment,
3084 so we might as well not have any types that claim to have it. */
3085 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3087 null_pointer_node = build_int_2 (0, 0);
3088 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3089 layout_type (TREE_TYPE (null_pointer_node));
3091 string_type_node = build_pointer_type (char_type_node);
3092 const_string_type_node
3093 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3095 /* Make a type to be the domain of a few array types
3096 whose domains don't really matter.
3097 200 is small enough that it always fits in size_t
3098 and large enough that it can hold most function names for the
3099 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3100 array_domain_type = build_index_type (build_int_2 (200, 0));
3102 /* make a type for arrays of characters.
3103 With luck nothing will ever really depend on the length of this
3105 char_array_type_node
3106 = build_array_type (char_type_node, array_domain_type);
3107 /* Likewise for arrays of ints. */
3109 = build_array_type (integer_type_node, array_domain_type);
3110 /* This is for wide string constants. */
3111 wchar_array_type_node
3112 = build_array_type (wchar_type_node, array_domain_type);
3114 default_function_type
3115 = build_function_type (integer_type_node, NULL_TREE);
3117 ptr_type_node = build_pointer_type (void_type_node);
3119 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3121 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3124 = build_function_type (void_type_node, NULL_TREE);
3127 = build_function_type (float_type_node,
3128 tree_cons (NULL_TREE, float_type_node, endlink));
3131 = build_function_type (double_type_node,
3132 tree_cons (NULL_TREE, double_type_node, endlink));
3134 ldouble_ftype_ldouble
3135 = build_function_type (long_double_type_node,
3136 tree_cons (NULL_TREE, long_double_type_node,
3139 double_ftype_double_double
3140 = build_function_type (double_type_node,
3141 tree_cons (NULL_TREE, double_type_node,
3142 tree_cons (NULL_TREE,
3143 double_type_node, endlink)));
3146 = build_function_type (integer_type_node,
3147 tree_cons (NULL_TREE, integer_type_node, endlink));
3150 = build_function_type (long_integer_type_node,
3151 tree_cons (NULL_TREE,
3152 long_integer_type_node, endlink));
3154 void_ftype_ptr_ptr_int
3155 = build_function_type (void_type_node,
3156 tree_cons (NULL_TREE, ptr_type_node,
3157 tree_cons (NULL_TREE, ptr_type_node,
3158 tree_cons (NULL_TREE,
3162 int_ftype_cptr_cptr_sizet
3163 = build_function_type (integer_type_node,
3164 tree_cons (NULL_TREE, const_ptr_type_node,
3165 tree_cons (NULL_TREE, const_ptr_type_node,
3166 tree_cons (NULL_TREE,
3170 void_ftype_ptr_int_int
3171 = build_function_type (void_type_node,
3172 tree_cons (NULL_TREE, ptr_type_node,
3173 tree_cons (NULL_TREE, integer_type_node,
3174 tree_cons (NULL_TREE,
3178 string_ftype_ptr_ptr /* strcpy prototype */
3179 = build_function_type (string_type_node,
3180 tree_cons (NULL_TREE, string_type_node,
3181 tree_cons (NULL_TREE,
3182 const_string_type_node,
3185 int_ftype_string_string /* strcmp prototype */
3186 = build_function_type (integer_type_node,
3187 tree_cons (NULL_TREE, const_string_type_node,
3188 tree_cons (NULL_TREE,
3189 const_string_type_node,
3192 strlen_ftype /* strlen prototype */
3193 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3194 tree_cons (NULL_TREE, const_string_type_node,
3197 traditional_ptr_type_node
3198 = (flag_traditional ? string_type_node : ptr_type_node);
3200 memcpy_ftype /* memcpy prototype */
3201 = build_function_type (traditional_ptr_type_node,
3202 tree_cons (NULL_TREE, ptr_type_node,
3203 tree_cons (NULL_TREE, const_ptr_type_node,
3204 tree_cons (NULL_TREE,
3208 memset_ftype /* memset prototype */
3209 = build_function_type (traditional_ptr_type_node,
3210 tree_cons (NULL_TREE, ptr_type_node,
3211 tree_cons (NULL_TREE, integer_type_node,
3212 tree_cons (NULL_TREE,
3216 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3218 = build_function_type (ptr_type_node,
3219 tree_cons (NULL_TREE, ptr_type_node, endlink));
3221 builtin_function ("__builtin_constant_p", default_function_type,
3222 BUILT_IN_CONSTANT_P, NULL_PTR);
3224 builtin_function ("__builtin_return_address",
3225 build_function_type (ptr_type_node,
3226 tree_cons (NULL_TREE,
3229 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3231 builtin_function ("__builtin_frame_address",
3232 build_function_type (ptr_type_node,
3233 tree_cons (NULL_TREE,
3236 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3238 builtin_function ("__builtin_aggregate_incoming_address",
3239 build_function_type (ptr_type_node, NULL_TREE),
3240 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3242 /* Hooks for the DWARF 2 __throw routine. */
3243 builtin_function ("__builtin_unwind_init",
3244 build_function_type (void_type_node, endlink),
3245 BUILT_IN_UNWIND_INIT, NULL_PTR);
3246 builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
3247 builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
3248 builtin_function ("__builtin_dwarf_fp_regnum",
3249 build_function_type (unsigned_type_node, endlink),
3250 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3251 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3252 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3253 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3254 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3255 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3256 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3257 builtin_function ("__builtin_set_return_addr_reg",
3258 build_function_type (void_type_node,
3259 tree_cons (NULL_TREE,
3262 BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
3263 builtin_function ("__builtin_eh_stub_old", ptr_ftype_void,
3264 BUILT_IN_EH_STUB_OLD, NULL_PTR);
3265 builtin_function ("__builtin_eh_stub", ptr_ftype_void,
3266 BUILT_IN_EH_STUB, NULL_PTR);
3268 ("__builtin_set_eh_regs",
3269 build_function_type (void_type_node,
3270 tree_cons (NULL_TREE, ptr_type_node,
3271 tree_cons (NULL_TREE,
3272 type_for_mode (ptr_mode, 0),
3274 BUILT_IN_SET_EH_REGS, NULL_PTR);
3276 builtin_function ("__builtin_alloca",
3277 build_function_type (ptr_type_node,
3278 tree_cons (NULL_TREE,
3281 BUILT_IN_ALLOCA, "alloca");
3282 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3283 /* Define alloca, ffs as builtins.
3284 Declare _exit just to mark it as volatile. */
3285 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3287 temp = builtin_function ("alloca",
3288 build_function_type (ptr_type_node,
3289 tree_cons (NULL_TREE,
3292 BUILT_IN_ALLOCA, NULL_PTR);
3293 /* Suppress error if redefined as a non-function. */
3294 DECL_BUILT_IN_NONANSI (temp) = 1;
3295 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3296 /* Suppress error if redefined as a non-function. */
3297 DECL_BUILT_IN_NONANSI (temp) = 1;
3298 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3300 TREE_THIS_VOLATILE (temp) = 1;
3301 TREE_SIDE_EFFECTS (temp) = 1;
3302 /* Suppress error if redefined as a non-function. */
3303 DECL_BUILT_IN_NONANSI (temp) = 1;
3306 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3307 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3309 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3311 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3313 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3315 builtin_function ("__builtin_saveregs",
3316 build_function_type (ptr_type_node, NULL_TREE),
3317 BUILT_IN_SAVEREGS, NULL_PTR);
3318 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3320 builtin_function ("__builtin_varargs",
3321 build_function_type (ptr_type_node,
3322 tree_cons (NULL_TREE,
3325 BUILT_IN_VARARGS, NULL_PTR);
3327 builtin_function ("__builtin_classify_type", default_function_type,
3328 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3329 builtin_function ("__builtin_next_arg",
3330 build_function_type (ptr_type_node, NULL_TREE),
3331 BUILT_IN_NEXT_ARG, NULL_PTR);
3332 builtin_function ("__builtin_args_info",
3333 build_function_type (integer_type_node,
3334 tree_cons (NULL_TREE,
3337 BUILT_IN_ARGS_INFO, NULL_PTR);
3339 /* Untyped call and return. */
3340 builtin_function ("__builtin_apply_args",
3341 build_function_type (ptr_type_node, NULL_TREE),
3342 BUILT_IN_APPLY_ARGS, NULL_PTR);
3344 temp = tree_cons (NULL_TREE,
3345 build_pointer_type (build_function_type (void_type_node,
3347 tree_cons (NULL_TREE,
3349 tree_cons (NULL_TREE,
3352 builtin_function ("__builtin_apply",
3353 build_function_type (ptr_type_node, temp),
3354 BUILT_IN_APPLY, NULL_PTR);
3355 builtin_function ("__builtin_return",
3356 build_function_type (void_type_node,
3357 tree_cons (NULL_TREE,
3360 BUILT_IN_RETURN, NULL_PTR);
3362 /* Currently under experimentation. */
3363 builtin_function ("__builtin_memcpy", memcpy_ftype,
3364 BUILT_IN_MEMCPY, "memcpy");
3365 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3366 BUILT_IN_MEMCMP, "memcmp");
3367 builtin_function ("__builtin_memset", memset_ftype,
3368 BUILT_IN_MEMSET, "memset");
3369 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3370 BUILT_IN_STRCMP, "strcmp");
3371 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3372 BUILT_IN_STRCPY, "strcpy");
3373 builtin_function ("__builtin_strlen", strlen_ftype,
3374 BUILT_IN_STRLEN, "strlen");
3375 builtin_function ("__builtin_sqrtf", float_ftype_float,
3376 BUILT_IN_FSQRT, "sqrtf");
3377 builtin_function ("__builtin_fsqrt", double_ftype_double,
3378 BUILT_IN_FSQRT, "sqrt");
3379 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3380 BUILT_IN_FSQRT, "sqrtl");
3381 builtin_function ("__builtin_sinf", float_ftype_float,
3382 BUILT_IN_SIN, "sinf");
3383 builtin_function ("__builtin_sin", double_ftype_double,
3384 BUILT_IN_SIN, "sin");
3385 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3386 BUILT_IN_SIN, "sinl");
3387 builtin_function ("__builtin_cosf", float_ftype_float,
3388 BUILT_IN_COS, "cosf");
3389 builtin_function ("__builtin_cos", double_ftype_double,
3390 BUILT_IN_COS, "cos");
3391 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3392 BUILT_IN_COS, "cosl");
3393 builtin_function ("__builtin_setjmp",
3394 build_function_type (integer_type_node,
3395 tree_cons (NULL_TREE,
3396 ptr_type_node, endlink)),
3397 BUILT_IN_SETJMP, NULL_PTR);
3398 builtin_function ("__builtin_longjmp",
3401 tree_cons (NULL, ptr_type_node,
3402 tree_cons (NULL_TREE,
3405 BUILT_IN_LONGJMP, NULL_PTR);
3407 /* In an ANSI C program, it is okay to supply built-in meanings
3408 for these functions, since applications cannot validly use them
3409 with any other meaning.
3410 However, honor the -fno-builtin option. */
3411 if (!flag_no_builtin)
3413 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3414 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3415 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3416 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3418 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3419 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3420 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3422 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3423 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3425 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3427 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3428 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3429 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3430 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3432 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3433 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3434 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3435 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3436 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3437 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3439 /* Declare these functions volatile
3440 to avoid spurious "control drops through" warnings. */
3441 /* Don't specify the argument types, to avoid errors
3442 from certain code which isn't valid in ANSI but which exists. */
3443 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3445 TREE_THIS_VOLATILE (temp) = 1;
3446 TREE_SIDE_EFFECTS (temp) = 1;
3447 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3448 TREE_THIS_VOLATILE (temp) = 1;
3449 TREE_SIDE_EFFECTS (temp) = 1;
3453 /* Support for these has not been written in either expand_builtin
3454 or build_function_call. */
3455 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3456 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3457 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3459 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3461 builtin_function ("__builtin_fmod", double_ftype_double_double,
3462 BUILT_IN_FMOD, NULL_PTR);
3463 builtin_function ("__builtin_frem", double_ftype_double_double,
3464 BUILT_IN_FREM, NULL_PTR);
3465 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3467 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3471 pedantic_lvalues = pedantic;
3473 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3474 declare_function_name ();
3476 start_identifier_warnings ();
3478 /* Prepare to check format strings against argument lists. */
3479 init_function_format_info ();
3483 incomplete_decl_finalize_hook = finish_incomplete_decl;
3486 /* Return a definition for a builtin function named NAME and whose data type
3487 is TYPE. TYPE should be a function type with argument types.
3488 FUNCTION_CODE tells later passes how to compile calls to this function.
3489 See tree.h for its possible values.
3491 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3492 the name to be called if we can't opencode the function. */
3495 builtin_function (name, type, function_code, library_name)
3498 enum built_in_function function_code;
3501 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3502 DECL_EXTERNAL (decl) = 1;
3503 TREE_PUBLIC (decl) = 1;
3504 /* If -traditional, permit redefining a builtin function any way you like.
3505 (Though really, if the program redefines these functions,
3506 it probably won't work right unless compiled with -fno-builtin.) */
3507 if (flag_traditional && name[0] != '_')
3508 DECL_BUILT_IN_NONANSI (decl) = 1;
3510 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3511 make_decl_rtl (decl, NULL_PTR, 1);
3513 if (function_code != NOT_BUILT_IN)
3515 DECL_BUILT_IN (decl) = 1;
3516 DECL_FUNCTION_CODE (decl) = function_code;
3518 /* Warn if a function in the namespace for users
3519 is used without an occasion to consider it declared. */
3520 if (name[0] != '_' || name[1] != '_')
3521 C_DECL_ANTICIPATED (decl) = 1;
3526 /* Called when a declaration is seen that contains no names to declare.
3527 If its type is a reference to a structure, union or enum inherited
3528 from a containing scope, shadow that tag name for the current scope
3529 with a forward reference.
3530 If its type defines a new named structure or union
3531 or defines an enum, it is valid but we need not do anything here.
3532 Otherwise, it is an error. */
3535 shadow_tag (declspecs)
3538 shadow_tag_warned (declspecs, 0);
3542 shadow_tag_warned (declspecs, warned)
3545 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3552 pending_invalid_xref = 0;
3554 /* Remove the attributes from declspecs, since they will confuse the
3556 split_specs_attrs (declspecs, &specs, &attrs);
3558 for (link = declspecs; link; link = TREE_CHAIN (link))
3560 register tree value = TREE_VALUE (link);
3561 register enum tree_code code = TREE_CODE (value);
3563 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3564 /* Used to test also that TYPE_SIZE (value) != 0.
3565 That caused warning for `struct foo;' at top level in the file. */
3567 register tree name = lookup_tag_reverse (value);
3574 if (warned != 1 && code != ENUMERAL_TYPE)
3575 /* Empty unnamed enum OK */
3577 pedwarn ("unnamed struct/union that defines no instances");
3583 t = lookup_tag (code, name, current_binding_level, 1);
3587 t = make_node (code);
3594 if (!warned && ! in_system_header)
3596 warning ("useless keyword or type name in empty declaration");
3603 error ("two types specified in one empty declaration");
3608 pedwarn ("empty declaration");
3612 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3615 groktypename (typename)
3618 if (TREE_CODE (typename) != TREE_LIST)
3620 return grokdeclarator (TREE_VALUE (typename),
3621 TREE_PURPOSE (typename),
3625 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3628 groktypename_in_parm_context (typename)
3631 if (TREE_CODE (typename) != TREE_LIST)
3633 return grokdeclarator (TREE_VALUE (typename),
3634 TREE_PURPOSE (typename),
3638 /* Decode a declarator in an ordinary declaration or data definition.
3639 This is called as soon as the type information and variable name
3640 have been parsed, before parsing the initializer if any.
3641 Here we create the ..._DECL node, fill in its type,
3642 and put it on the list of decls for the current context.
3643 The ..._DECL node is returned as the value.
3645 Exception: for arrays where the length is not specified,
3646 the type is left null, to be filled in by `finish_decl'.
3648 Function definitions do not come here; they go to start_function
3649 instead. However, external and forward declarations of functions
3650 do go through here. Structure field declarations are done by
3651 grokfield and not through here. */
3653 /* Set this to zero to debug not using the temporary obstack
3654 to parse initializers. */
3655 int debug_temp_inits = 1;
3658 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3659 tree declarator, declspecs;
3661 tree attributes, prefix_attributes;
3663 register tree decl = grokdeclarator (declarator, declspecs,
3664 NORMAL, initialized);
3666 int init_written = initialized;
3668 /* The corresponding pop_obstacks is in finish_decl. */
3669 push_obstacks_nochange ();
3671 if (warn_main && !strcmp (IDENTIFIER_POINTER (declarator), "main"))
3672 warning_with_decl (decl, "`%s' is usually a function");
3675 /* Is it valid for this decl to have an initializer at all?
3676 If not, set INITIALIZED to zero, which will indirectly
3677 tell `finish_decl' to ignore the initializer once it is parsed. */
3678 switch (TREE_CODE (decl))
3681 /* typedef foo = bar means give foo the same type as bar.
3682 We haven't parsed bar yet, so `finish_decl' will fix that up.
3683 Any other case of an initialization in a TYPE_DECL is an error. */
3684 if (pedantic || list_length (declspecs) > 1)
3686 error ("typedef `%s' is initialized",
3687 IDENTIFIER_POINTER (DECL_NAME (decl)));
3693 error ("function `%s' is initialized like a variable",
3694 IDENTIFIER_POINTER (DECL_NAME (decl)));
3699 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3700 error ("parameter `%s' is initialized",
3701 IDENTIFIER_POINTER (DECL_NAME (decl)));
3706 /* Don't allow initializations for incomplete types
3707 except for arrays which might be completed by the initialization. */
3708 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3710 /* A complete type is ok if size is fixed. */
3712 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3713 || C_DECL_VARIABLE_SIZE (decl))
3715 error ("variable-sized object may not be initialized");
3719 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3721 error ("variable `%s' has initializer but incomplete type",
3722 IDENTIFIER_POINTER (DECL_NAME (decl)));
3725 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3727 error ("elements of array `%s' have incomplete type",
3728 IDENTIFIER_POINTER (DECL_NAME (decl)));
3735 #if 0 /* Seems redundant with grokdeclarator. */
3736 if (current_binding_level != global_binding_level
3737 && DECL_EXTERNAL (decl)
3738 && TREE_CODE (decl) != FUNCTION_DECL)
3739 warning ("declaration of `%s' has `extern' and is initialized",
3740 IDENTIFIER_POINTER (DECL_NAME (decl)));
3742 DECL_EXTERNAL (decl) = 0;
3743 if (current_binding_level == global_binding_level)
3744 TREE_STATIC (decl) = 1;
3746 /* Tell `pushdecl' this is an initialized decl
3747 even though we don't yet have the initializer expression.
3748 Also tell `finish_decl' it may store the real initializer. */
3749 DECL_INITIAL (decl) = error_mark_node;
3752 /* If this is a function declaration, write a record describing it to the
3753 prototypes file (if requested). */
3755 if (TREE_CODE (decl) == FUNCTION_DECL)
3756 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3758 /* ANSI specifies that a tentative definition which is not merged with
3759 a non-tentative definition behaves exactly like a definition with an
3760 initializer equal to zero. (Section 3.7.2)
3761 -fno-common gives strict ANSI behavior. Usually you don't want it.
3762 This matters only for variables with external linkage. */
3763 if (! flag_no_common || ! TREE_PUBLIC (decl))
3764 DECL_COMMON (decl) = 1;
3766 /* Set attributes here so if duplicate decl, will have proper attributes. */
3767 decl_attributes (decl, attributes, prefix_attributes);
3769 /* Add this decl to the current binding level.
3770 TEM may equal DECL or it may be a previous decl of the same name. */
3771 tem = pushdecl (decl);
3773 /* For a local variable, define the RTL now. */
3774 if (current_binding_level != global_binding_level
3775 /* But not if this is a duplicate decl
3776 and we preserved the rtl from the previous one
3777 (which may or may not happen). */
3778 && DECL_RTL (tem) == 0)
3780 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3782 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3783 && DECL_INITIAL (tem) != 0)
3789 /* When parsing and digesting the initializer,
3790 use temporary storage. Do this even if we will ignore the value. */
3791 if (current_binding_level == global_binding_level && debug_temp_inits)
3792 temporary_allocation ();
3798 /* Finish processing of a declaration;
3799 install its initial value.
3800 If the length of an array type is not known before,
3801 it must be determined now, from the initial value, or it is an error. */
3804 finish_decl (decl, init, asmspec_tree)
3808 register tree type = TREE_TYPE (decl);
3809 int was_incomplete = (DECL_SIZE (decl) == 0);
3810 int temporary = allocation_temporary_p ();
3813 /* If a name was specified, get the string. */
3815 asmspec = TREE_STRING_POINTER (asmspec_tree);
3817 /* If `start_decl' didn't like having an initialization, ignore it now. */
3819 if (init != 0 && DECL_INITIAL (decl) == 0)
3821 /* Don't crash if parm is initialized. */
3822 if (TREE_CODE (decl) == PARM_DECL)
3825 if (ITERATOR_P (decl))
3828 error_with_decl (decl, "iterator has no initial value");
3830 init = save_expr (init);
3835 if (TREE_CODE (decl) != TYPE_DECL)
3836 store_init_value (decl, init);
3839 /* typedef foo = bar; store the type of bar as the type of foo. */
3840 TREE_TYPE (decl) = TREE_TYPE (init);
3841 DECL_INITIAL (decl) = init = 0;
3845 /* Pop back to the obstack that is current for this binding level.
3846 This is because MAXINDEX, rtl, etc. to be made below
3847 must go in the permanent obstack. But don't discard the
3848 temporary data yet. */
3850 #if 0 /* pop_obstacks was near the end; this is what was here. */
3851 if (current_binding_level == global_binding_level && temporary)
3852 end_temporary_allocation ();
3855 /* Deduce size of array from initialization, if not already known */
3857 if (TREE_CODE (type) == ARRAY_TYPE
3858 && TYPE_DOMAIN (type) == 0
3859 && TREE_CODE (decl) != TYPE_DECL)
3862 = (TREE_STATIC (decl)
3863 /* Even if pedantic, an external linkage array
3864 may have incomplete type at first. */
3865 ? pedantic && !TREE_PUBLIC (decl)
3866 : !DECL_EXTERNAL (decl));
3868 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3870 /* Get the completed type made by complete_array_type. */
3871 type = TREE_TYPE (decl);
3874 error_with_decl (decl, "initializer fails to determine size of `%s'");
3879 error_with_decl (decl, "array size missing in `%s'");
3880 /* If a `static' var's size isn't known,
3881 make it extern as well as static, so it does not get
3883 If it is not `static', then do not mark extern;
3884 finish_incomplete_decl will give it a default size
3885 and it will get allocated. */
3886 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3887 DECL_EXTERNAL (decl) = 1;
3890 /* TYPE_MAX_VALUE is always one less than the number of elements
3891 in the array, because we start counting at zero. Therefore,
3892 warn only if the value is less than zero. */
3893 if (pedantic && TYPE_DOMAIN (type) != 0
3894 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3895 error_with_decl (decl, "zero or negative size array `%s'");
3897 layout_decl (decl, 0);
3900 if (TREE_CODE (decl) == VAR_DECL)
3902 if (DECL_SIZE (decl) == 0
3903 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3904 layout_decl (decl, 0);
3906 if (DECL_SIZE (decl) == 0
3907 && (TREE_STATIC (decl)
3909 /* A static variable with an incomplete type
3910 is an error if it is initialized.
3911 Also if it is not file scope.
3912 Otherwise, let it through, but if it is not `extern'
3913 then it may cause an error message later. */
3914 /* A duplicate_decls call could have changed an extern
3915 declaration into a file scope one. This can be detected
3916 by TREE_ASM_WRITTEN being set. */
3917 (DECL_INITIAL (decl) != 0
3918 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3920 /* An automatic variable with an incomplete type
3922 !DECL_EXTERNAL (decl)))
3924 error_with_decl (decl, "storage size of `%s' isn't known");
3925 TREE_TYPE (decl) = error_mark_node;
3928 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3929 && DECL_SIZE (decl) != 0)
3931 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3932 constant_expression_warning (DECL_SIZE (decl));
3934 error_with_decl (decl, "storage size of `%s' isn't constant");
3937 if (TREE_USED (type))
3938 TREE_USED (decl) = 1;
3941 /* If this is a function and an assembler name is specified, it isn't
3942 builtin any more. Also reset DECL_RTL so we can give it its new
3944 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3946 DECL_BUILT_IN (decl) = 0;
3947 DECL_RTL (decl) = 0;
3950 /* Output the assembler code and/or RTL code for variables and functions,
3951 unless the type is an undefined structure or union.
3952 If not, it will get done when the type is completed. */
3954 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3956 if ((flag_traditional || TREE_PERMANENT (decl))
3957 && allocation_temporary_p ())
3959 push_obstacks_nochange ();
3960 end_temporary_allocation ();
3961 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3962 maybe_objc_check_decl (decl);
3963 rest_of_decl_compilation (decl, asmspec,
3964 (DECL_CONTEXT (decl) == 0
3965 || TREE_ASM_WRITTEN (decl)),
3971 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3972 maybe_objc_check_decl (decl);
3973 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3976 if (DECL_CONTEXT (decl) != 0)
3978 /* Recompute the RTL of a local array now
3979 if it used to be an incomplete type. */
3981 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3983 /* If we used it already as memory, it must stay in memory. */
3984 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3985 /* If it's still incomplete now, no init will save it. */
3986 if (DECL_SIZE (decl) == 0)
3987 DECL_INITIAL (decl) = 0;
3990 /* Compute and store the initial value. */
3991 if (TREE_CODE (decl) != FUNCTION_DECL)
3992 expand_decl_init (decl);
3996 if (TREE_CODE (decl) == TYPE_DECL)
3998 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3999 maybe_objc_check_decl (decl);
4000 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4004 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4005 /* This test used to include TREE_PERMANENT, however, we have the same
4006 problem with initializers at the function level. Such initializers get
4007 saved until the end of the function on the momentary_obstack. */
4008 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4010 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4011 space with DECL_ARG_TYPE. */
4012 && TREE_CODE (decl) != PARM_DECL)
4014 /* We need to remember that this array HAD an initialization,
4015 but discard the actual temporary nodes,
4016 since we can't have a permanent node keep pointing to them. */
4017 /* We make an exception for inline functions, since it's
4018 normal for a local extern redeclaration of an inline function
4019 to have a copy of the top-level decl's DECL_INLINE. */
4020 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4022 /* If this is a const variable, then preserve the
4023 initializer instead of discarding it so that we can optimize
4024 references to it. */
4025 /* This test used to include TREE_STATIC, but this won't be set
4026 for function level initializers. */
4027 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4029 preserve_initializer ();
4030 /* Hack? Set the permanent bit for something that is permanent,
4031 but not on the permanent obstack, so as to convince
4032 output_constant_def to make its rtl on the permanent
4034 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4036 /* The initializer and DECL must have the same (or equivalent
4037 types), but if the initializer is a STRING_CST, its type
4038 might not be on the right obstack, so copy the type
4040 TREE_TYPE (DECL_INITIAL (decl)) = type;
4043 DECL_INITIAL (decl) = error_mark_node;
4047 /* If requested, warn about definitions of large data objects. */
4049 if (warn_larger_than
4050 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4051 && !DECL_EXTERNAL (decl))
4053 register tree decl_size = DECL_SIZE (decl);
4055 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4057 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4059 if (units > larger_than_size)
4060 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4065 /* Resume permanent allocation, if not within a function. */
4066 /* The corresponding push_obstacks_nochange is in start_decl,
4067 and in push_parm_decl and in grokfield. */
4071 /* If we have gone back from temporary to permanent allocation,
4072 actually free the temporary space that we no longer need. */
4073 if (temporary && !allocation_temporary_p ())
4074 permanent_allocation (0);
4076 /* At the end of a declaration, throw away any variable type sizes
4077 of types defined inside that declaration. There is no use
4078 computing them in the following function definition. */
4079 if (current_binding_level == global_binding_level)
4080 get_pending_sizes ();
4083 /* If DECL has a cleanup, build and return that cleanup here.
4084 This is a callback called by expand_expr. */
4087 maybe_build_cleanup (decl)
4088 tree decl ATTRIBUTE_UNUSED;
4090 /* There are no cleanups in C. */
4094 /* Given a parsed parameter declaration,
4095 decode it into a PARM_DECL and push that on the current binding level.
4096 Also, for the sake of forward parm decls,
4097 record the given order of parms in `parm_order'. */
4100 push_parm_decl (parm)
4104 int old_immediate_size_expand = immediate_size_expand;
4105 /* Don't try computing parm sizes now -- wait till fn is called. */
4106 immediate_size_expand = 0;
4108 /* The corresponding pop_obstacks is in finish_decl. */
4109 push_obstacks_nochange ();
4111 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4112 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4113 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4114 TREE_PURPOSE (TREE_VALUE (parm)));
4117 if (DECL_NAME (decl))
4120 olddecl = lookup_name (DECL_NAME (decl));
4121 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4122 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4126 decl = pushdecl (decl);
4128 immediate_size_expand = old_immediate_size_expand;
4130 current_binding_level->parm_order
4131 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4133 /* Add this decl to the current binding level. */
4134 finish_decl (decl, NULL_TREE, NULL_TREE);
4137 /* Clear the given order of parms in `parm_order'.
4138 Used at start of parm list,
4139 and also at semicolon terminating forward decls. */
4144 current_binding_level->parm_order = NULL_TREE;
4147 /* Make TYPE a complete type based on INITIAL_VALUE.
4148 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4149 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4152 complete_array_type (type, initial_value, do_default)
4157 register tree maxindex = NULL_TREE;
4162 /* Note MAXINDEX is really the maximum index,
4163 one less than the size. */
4164 if (TREE_CODE (initial_value) == STRING_CST)
4167 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4168 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4171 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4173 tree elts = CONSTRUCTOR_ELTS (initial_value);
4174 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4175 for (; elts; elts = TREE_CHAIN (elts))
4177 if (TREE_PURPOSE (elts))
4178 maxindex = TREE_PURPOSE (elts);
4180 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4182 maxindex = copy_node (maxindex);
4186 /* Make an error message unless that happened already. */
4187 if (initial_value != error_mark_node)
4190 /* Prevent further error messages. */
4191 maxindex = build_int_2 (0, 0);
4198 maxindex = build_int_2 (0, 0);
4204 TYPE_DOMAIN (type) = build_index_type (maxindex);
4205 if (!TREE_TYPE (maxindex))
4206 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4209 /* Lay out the type now that we can get the real answer. */
4216 /* Given declspecs and a declarator,
4217 determine the name and type of the object declared
4218 and construct a ..._DECL node for it.
4219 (In one case we can return a ..._TYPE node instead.
4220 For invalid input we sometimes return 0.)
4222 DECLSPECS is a chain of tree_list nodes whose value fields
4223 are the storage classes and type specifiers.
4225 DECL_CONTEXT says which syntactic context this declaration is in:
4226 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4227 FUNCDEF for a function definition. Like NORMAL but a few different
4228 error messages in each case. Return value may be zero meaning
4229 this definition is too screwy to try to parse.
4230 PARM for a parameter declaration (either within a function prototype
4231 or before a function body). Make a PARM_DECL, or return void_type_node.
4232 TYPENAME if for a typename (in a cast or sizeof).
4233 Don't make a DECL node; just return the ..._TYPE node.
4234 FIELD for a struct or union field; make a FIELD_DECL.
4235 BITFIELD for a field with specified width.
4236 INITIALIZED is 1 if the decl has an initializer.
4238 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4239 It may also be so in the PARM case, for a prototype where the
4240 argument type is specified but not the name.
4242 This function is where the complicated C meanings of `static'
4243 and `extern' are interpreted. */
4246 grokdeclarator (declarator, declspecs, decl_context, initialized)
4249 enum decl_context decl_context;
4254 tree type = NULL_TREE;
4259 int explicit_int = 0;
4260 int explicit_char = 0;
4261 int defaulted_int = 0;
4262 tree typedef_decl = 0;
4264 tree typedef_type = 0;
4265 int funcdef_flag = 0;
4266 enum tree_code innermost_code = ERROR_MARK;
4268 int size_varies = 0;
4269 tree decl_machine_attr = NULL_TREE;
4271 if (decl_context == BITFIELD)
4272 bitfield = 1, decl_context = FIELD;
4274 if (decl_context == FUNCDEF)
4275 funcdef_flag = 1, decl_context = NORMAL;
4277 push_obstacks_nochange ();
4279 if (flag_traditional && allocation_temporary_p ())
4280 end_temporary_allocation ();
4282 /* Look inside a declarator for the name being declared
4283 and get it as a string, for an error message. */
4285 register tree decl = declarator;
4289 switch (TREE_CODE (decl))
4294 innermost_code = TREE_CODE (decl);
4295 decl = TREE_OPERAND (decl, 0);
4298 case IDENTIFIER_NODE:
4299 name = IDENTIFIER_POINTER (decl);
4310 /* A function definition's declarator must have the form of
4311 a function declarator. */
4313 if (funcdef_flag && innermost_code != CALL_EXPR)
4316 /* Anything declared one level down from the top level
4317 must be one of the parameters of a function
4318 (because the body is at least two levels down). */
4320 /* If this looks like a function definition, make it one,
4321 even if it occurs where parms are expected.
4322 Then store_parm_decls will reject it and not use it as a parm. */
4323 if (decl_context == NORMAL && !funcdef_flag
4324 && current_binding_level->parm_flag)
4325 decl_context = PARM;
4327 /* Look through the decl specs and record which ones appear.
4328 Some typespecs are defined as built-in typenames.
4329 Others, the ones that are modifiers of other types,
4330 are represented by bits in SPECBITS: set the bits for
4331 the modifiers that appear. Storage class keywords are also in SPECBITS.
4333 If there is a typedef name or a type, store the type in TYPE.
4334 This includes builtin typedefs such as `int'.
4336 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4337 and did not come from a user typedef.
4339 Set LONGLONG if `long' is mentioned twice. */
4341 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4344 register tree id = TREE_VALUE (spec);
4346 if (id == ridpointers[(int) RID_INT])
4348 if (id == ridpointers[(int) RID_CHAR])
4351 if (TREE_CODE (id) == IDENTIFIER_NODE)
4352 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4354 if (ridpointers[i] == id)
4356 if (i == (int) RID_LONG && specbits & (1<<i))
4359 error ("`long long long' is too long for GCC");
4362 if (pedantic && ! in_system_header)
4363 pedwarn ("ANSI C does not support `long long'");
4367 else if (specbits & (1 << i))
4368 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4374 error ("two or more data types in declaration of `%s'", name);
4375 /* Actual typedefs come to us as TYPE_DECL nodes. */
4376 else if (TREE_CODE (id) == TYPE_DECL)
4378 type = TREE_TYPE (id);
4379 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4382 /* Built-in types come as identifiers. */
4383 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4385 register tree t = lookup_name (id);
4386 if (TREE_TYPE (t) == error_mark_node)
4388 else if (!t || TREE_CODE (t) != TYPE_DECL)
4389 error ("`%s' fails to be a typedef or built in type",
4390 IDENTIFIER_POINTER (id));
4393 type = TREE_TYPE (t);
4397 else if (TREE_CODE (id) != ERROR_MARK)
4403 typedef_type = type;
4405 size_varies = C_TYPE_VARIABLE_SIZE (type);
4407 /* No type at all: default to `int', and set DEFAULTED_INT
4408 because it was not a user-defined typedef. */
4412 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4413 | (1 << (int) RID_SIGNED)
4414 | (1 << (int) RID_UNSIGNED))))
4415 && ! (in_system_header && ! allocation_temporary_p ()))
4417 /* C9x will probably require a diagnostic here.
4418 For now, issue a warning if -Wreturn-type and this is a function,
4419 or if -Wimplicit; prefer the former warning since it is more
4421 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4422 warn_about_return_type = 1;
4423 else if (warn_implicit_int)
4424 warning ("type defaults to `int' in declaration of `%s'", name);
4428 type = integer_type_node;
4431 /* Now process the modifiers that were specified
4432 and check for invalid combinations. */
4434 /* Long double is a special combination. */
4436 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4437 && TYPE_MAIN_VARIANT (type) == double_type_node)
4439 specbits &= ~ (1 << (int) RID_LONG);
4440 type = long_double_type_node;
4443 /* Check all other uses of type modifiers. */
4445 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4446 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4450 if ((specbits & 1 << (int) RID_LONG)
4451 && (specbits & 1 << (int) RID_SHORT))
4452 error ("both long and short specified for `%s'", name);
4453 else if (((specbits & 1 << (int) RID_LONG)
4454 || (specbits & 1 << (int) RID_SHORT))
4456 error ("long or short specified with char for `%s'", name);
4457 else if (((specbits & 1 << (int) RID_LONG)
4458 || (specbits & 1 << (int) RID_SHORT))
4459 && TREE_CODE (type) == REAL_TYPE)
4461 static int already = 0;
4463 error ("long or short specified with floating type for `%s'", name);
4464 if (! already && ! pedantic)
4466 error ("the only valid combination is `long double'");
4470 else if ((specbits & 1 << (int) RID_SIGNED)
4471 && (specbits & 1 << (int) RID_UNSIGNED))
4472 error ("both signed and unsigned specified for `%s'", name);
4473 else if (TREE_CODE (type) != INTEGER_TYPE)
4474 error ("long, short, signed or unsigned invalid for `%s'", name);
4478 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4480 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4482 if (flag_pedantic_errors)
4487 /* Discard the type modifiers if they are invalid. */
4490 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4491 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4496 if ((specbits & (1 << (int) RID_COMPLEX))
4497 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4499 error ("complex invalid for `%s'", name);
4500 specbits &= ~ (1 << (int) RID_COMPLEX);
4503 /* Decide whether an integer type is signed or not.
4504 Optionally treat bitfields as signed by default. */
4505 if (specbits & 1 << (int) RID_UNSIGNED
4506 /* Traditionally, all bitfields are unsigned. */
4507 || (bitfield && flag_traditional
4508 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4509 || (bitfield && ! flag_signed_bitfields
4510 && (explicit_int || defaulted_int || explicit_char
4511 /* A typedef for plain `int' without `signed'
4512 can be controlled just like plain `int'. */
4513 || ! (typedef_decl != 0
4514 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4515 && TREE_CODE (type) != ENUMERAL_TYPE
4516 && !(specbits & 1 << (int) RID_SIGNED)))
4519 type = long_long_unsigned_type_node;
4520 else if (specbits & 1 << (int) RID_LONG)
4521 type = long_unsigned_type_node;
4522 else if (specbits & 1 << (int) RID_SHORT)
4523 type = short_unsigned_type_node;
4524 else if (type == char_type_node)
4525 type = unsigned_char_type_node;
4526 else if (typedef_decl)
4527 type = unsigned_type (type);
4529 type = unsigned_type_node;
4531 else if ((specbits & 1 << (int) RID_SIGNED)
4532 && type == char_type_node)
4533 type = signed_char_type_node;
4535 type = long_long_integer_type_node;
4536 else if (specbits & 1 << (int) RID_LONG)
4537 type = long_integer_type_node;
4538 else if (specbits & 1 << (int) RID_SHORT)
4539 type = short_integer_type_node;
4541 if (specbits & 1 << (int) RID_COMPLEX)
4543 /* If we just have "complex", it is equivalent to
4544 "complex double", but if any modifiers at all are specified it is
4545 the complex form of TYPE. E.g, "complex short" is
4546 "complex short int". */
4548 if (defaulted_int && ! longlong
4549 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4550 | (1 << (int) RID_SIGNED)
4551 | (1 << (int) RID_UNSIGNED))))
4552 type = complex_double_type_node;
4553 else if (type == integer_type_node)
4554 type = complex_integer_type_node;
4555 else if (type == float_type_node)
4556 type = complex_float_type_node;
4557 else if (type == double_type_node)
4558 type = complex_double_type_node;
4559 else if (type == long_double_type_node)
4560 type = complex_long_double_type_node;
4562 type = build_complex_type (type);
4565 /* Set CONSTP if this declaration is `const', whether by
4566 explicit specification or via a typedef.
4567 Likewise for VOLATILEP. */
4569 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4570 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4571 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4573 pedwarn ("duplicate `const'");
4575 pedwarn ("duplicate `volatile'");
4576 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4577 type = TYPE_MAIN_VARIANT (type);
4579 /* Warn if two storage classes are given. Default to `auto'. */
4584 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4585 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4586 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4587 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4588 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4589 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4591 /* Warn about storage classes that are invalid for certain
4592 kinds of declarations (parameters, typenames, etc.). */
4595 error ("multiple storage classes in declaration of `%s'", name);
4596 else if (funcdef_flag
4598 & ((1 << (int) RID_REGISTER)
4599 | (1 << (int) RID_AUTO)
4600 | (1 << (int) RID_TYPEDEF))))
4602 if (specbits & 1 << (int) RID_AUTO
4603 && (pedantic || current_binding_level == global_binding_level))
4604 pedwarn ("function definition declared `auto'");
4605 if (specbits & 1 << (int) RID_REGISTER)
4606 error ("function definition declared `register'");
4607 if (specbits & 1 << (int) RID_TYPEDEF)
4608 error ("function definition declared `typedef'");
4609 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4610 | (1 << (int) RID_AUTO));
4612 else if (decl_context != NORMAL && nclasses > 0)
4614 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4618 error ((decl_context == FIELD
4619 ? "storage class specified for structure field `%s'"
4620 : (decl_context == PARM
4621 ? "storage class specified for parameter `%s'"
4622 : "storage class specified for typename")),
4624 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4625 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4626 | (1 << (int) RID_EXTERN));
4629 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4631 /* `extern' with initialization is invalid if not at top level. */
4632 if (current_binding_level == global_binding_level)
4633 warning ("`%s' initialized and declared `extern'", name);
4635 error ("`%s' has both `extern' and initializer", name);
4637 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4638 && current_binding_level != global_binding_level)
4639 error ("nested function `%s' declared `extern'", name);
4640 else if (current_binding_level == global_binding_level
4641 && specbits & (1 << (int) RID_AUTO))
4642 error ("top-level declaration of `%s' specifies `auto'", name);
4643 else if ((specbits & 1 << (int) RID_ITERATOR)
4644 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4646 error ("iterator `%s' has derived type", name);
4647 type = error_mark_node;
4649 else if ((specbits & 1 << (int) RID_ITERATOR)
4650 && TREE_CODE (type) != INTEGER_TYPE)
4652 error ("iterator `%s' has noninteger type", name);
4653 type = error_mark_node;
4657 /* Now figure out the structure of the declarator proper.
4658 Descend through it, creating more complex types, until we reach
4659 the declared identifier (or NULL_TREE, in an absolute declarator). */
4661 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4663 if (type == error_mark_node)
4665 declarator = TREE_OPERAND (declarator, 0);
4669 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4670 an INDIRECT_REF (for *...),
4671 a CALL_EXPR (for ...(...)),
4672 an identifier (for the name being declared)
4673 or a null pointer (for the place in an absolute declarator
4674 where the name was omitted).
4675 For the last two cases, we have just exited the loop.
4677 At this point, TYPE is the type of elements of an array,
4678 or for a function to return, or for a pointer to point to.
4679 After this sequence of ifs, TYPE is the type of the
4680 array or function or pointer, and DECLARATOR has had its
4681 outermost layer removed. */
4683 if (TREE_CODE (declarator) == ARRAY_REF)
4685 register tree itype = NULL_TREE;
4686 register tree size = TREE_OPERAND (declarator, 1);
4687 /* An uninitialized decl with `extern' is a reference. */
4688 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4689 /* The index is a signed object `sizetype' bits wide. */
4690 tree index_type = signed_type (sizetype);
4692 declarator = TREE_OPERAND (declarator, 0);
4694 /* Check for some types that there cannot be arrays of. */
4696 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4698 error ("declaration of `%s' as array of voids", name);
4699 type = error_mark_node;
4702 if (TREE_CODE (type) == FUNCTION_TYPE)
4704 error ("declaration of `%s' as array of functions", name);
4705 type = error_mark_node;
4708 if (size == error_mark_node)
4709 type = error_mark_node;
4711 if (type == error_mark_node)
4714 /* If this is a block level extern, it must live past the end
4715 of the function so that we can check it against other extern
4716 declarations (IDENTIFIER_LIMBO_VALUE). */
4717 if (extern_ref && allocation_temporary_p ())
4718 end_temporary_allocation ();
4720 /* If size was specified, set ITYPE to a range-type for that size.
4721 Otherwise, ITYPE remains null. finish_decl may figure it out
4722 from an initial value. */
4726 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4727 STRIP_TYPE_NOPS (size);
4729 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4730 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4732 error ("size of array `%s' has non-integer type", name);
4733 size = integer_one_node;
4736 if (pedantic && integer_zerop (size))
4737 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4739 if (TREE_CODE (size) == INTEGER_CST)
4741 constant_expression_warning (size);
4742 if (tree_int_cst_sgn (size) < 0)
4744 error ("size of array `%s' is negative", name);
4745 size = integer_one_node;
4750 /* Make sure the array size remains visibly nonconstant
4751 even if it is (eg) a const variable with known value. */
4756 if (TREE_CONSTANT (size))
4757 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4759 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4763 /* Convert size to index_type, so that if it is a variable
4764 the computations will be done in the proper mode. */
4765 itype = fold (build (MINUS_EXPR, index_type,
4766 convert (index_type, size),
4767 convert (index_type, size_one_node)));
4769 /* If that overflowed, the array is too big.
4770 ??? While a size of INT_MAX+1 technically shouldn't cause
4771 an overflow (because we subtract 1), the overflow is recorded
4772 during the conversion to index_type, before the subtraction.
4773 Handling this case seems like an unnecessary complication. */
4774 if (TREE_OVERFLOW (itype))
4776 error ("size of array `%s' is too large", name);
4777 type = error_mark_node;
4782 itype = variable_size (itype);
4783 itype = build_index_type (itype);
4786 #if 0 /* This had bad results for pointers to arrays, as in
4787 union incomplete (*foo)[4]; */
4788 /* Complain about arrays of incomplete types, except in typedefs. */
4790 if (TYPE_SIZE (type) == 0
4791 /* Avoid multiple warnings for nested array types. */
4792 && TREE_CODE (type) != ARRAY_TYPE
4793 && !(specbits & (1 << (int) RID_TYPEDEF))
4794 && !C_TYPE_BEING_DEFINED (type))
4795 warning ("array type has incomplete element type");
4798 #if 0 /* We shouldn't have a function type here at all!
4799 Functions aren't allowed as array elements. */
4800 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4801 && (constp || volatilep))
4802 pedwarn ("ANSI C forbids const or volatile function types");
4805 /* Build the array type itself, then merge any constancy or
4806 volatility into the target type. We must do it in this order
4807 to ensure that the TYPE_MAIN_VARIANT field of the array type
4808 is set correctly. */
4810 type = build_array_type (type, itype);
4811 if (constp || volatilep)
4812 type = c_build_type_variant (type, constp, volatilep);
4814 #if 0 /* don't clear these; leave them set so that the array type
4815 or the variable is itself const or volatile. */
4821 C_TYPE_VARIABLE_SIZE (type) = 1;
4823 else if (TREE_CODE (declarator) == CALL_EXPR)
4825 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4826 || current_binding_level == global_binding_level);
4829 /* Declaring a function type.
4830 Make sure we have a valid type for the function to return. */
4831 if (type == error_mark_node)
4836 /* Warn about some types functions can't return. */
4838 if (TREE_CODE (type) == FUNCTION_TYPE)
4840 error ("`%s' declared as function returning a function", name);
4841 type = integer_type_node;
4843 if (TREE_CODE (type) == ARRAY_TYPE)
4845 error ("`%s' declared as function returning an array", name);
4846 type = integer_type_node;
4849 #ifndef TRADITIONAL_RETURN_FLOAT
4850 /* Traditionally, declaring return type float means double. */
4852 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4853 type = double_type_node;
4854 #endif /* TRADITIONAL_RETURN_FLOAT */
4856 /* If this is a block level extern, it must live past the end
4857 of the function so that we can check it against other extern
4858 declarations (IDENTIFIER_LIMBO_VALUE). */
4859 if (extern_ref && allocation_temporary_p ())
4860 end_temporary_allocation ();
4862 /* Construct the function type and go to the next
4863 inner layer of declarator. */
4865 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4867 /* Say it's a definition
4868 only for the CALL_EXPR
4869 closest to the identifier. */
4870 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4871 #if 0 /* This seems to be false. We turn off temporary allocation
4872 above in this function if -traditional.
4873 And this code caused inconsistent results with prototypes:
4874 callers would ignore them, and pass arguments wrong. */
4876 /* Omit the arg types if -traditional, since the arg types
4877 and the list links might not be permanent. */
4878 type = build_function_type (type,
4880 ? NULL_TREE : arg_types);
4882 /* ANSI seems to say that `const int foo ();'
4883 does not make the function foo const. */
4884 if (constp || volatilep)
4885 type = c_build_type_variant (type, constp, volatilep);
4889 type = build_function_type (type, arg_types);
4890 declarator = TREE_OPERAND (declarator, 0);
4892 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4893 the formal parameter list of this FUNCTION_TYPE to point to
4894 the FUNCTION_TYPE node itself. */
4899 for (link = last_function_parm_tags;
4901 link = TREE_CHAIN (link))
4902 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4905 else if (TREE_CODE (declarator) == INDIRECT_REF)
4907 /* Merge any constancy or volatility into the target type
4910 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4911 && (constp || volatilep))
4912 pedwarn ("ANSI C forbids const or volatile function types");
4913 if (constp || volatilep)
4914 type = c_build_type_variant (type, constp, volatilep);
4919 type = build_pointer_type (type);
4921 /* Process a list of type modifier keywords
4922 (such as const or volatile) that were given inside the `*'. */
4924 if (TREE_TYPE (declarator))
4926 register tree typemodlist;
4928 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4929 typemodlist = TREE_CHAIN (typemodlist))
4931 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4933 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4938 error ("invalid type modifier within pointer declarator");
4942 pedwarn ("duplicate `const'");
4944 pedwarn ("duplicate `volatile'");
4947 declarator = TREE_OPERAND (declarator, 0);
4954 /* Now TYPE has the actual type. */
4956 /* Did array size calculations overflow? */
4958 if (TREE_CODE (type) == ARRAY_TYPE
4960 && TREE_OVERFLOW (TYPE_SIZE (type)))
4961 error ("size of array `%s' is too large", name);
4963 /* If this is declaring a typedef name, return a TYPE_DECL. */
4965 if (specbits & (1 << (int) RID_TYPEDEF))
4968 /* Note that the grammar rejects storage classes
4969 in typenames, fields or parameters */
4970 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4971 && (constp || volatilep))
4972 pedwarn ("ANSI C forbids const or volatile function types");
4973 if (constp || volatilep)
4974 type = c_build_type_variant (type, constp, volatilep);
4975 decl = build_decl (TYPE_DECL, declarator, type);
4976 if ((specbits & (1 << (int) RID_SIGNED))
4977 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4978 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4983 /* Detect the case of an array type of unspecified size
4984 which came, as such, direct from a typedef name.
4985 We must copy the type, so that each identifier gets
4986 a distinct type, so that each identifier's size can be
4987 controlled separately by its own initializer. */
4989 if (type != 0 && typedef_type != 0
4990 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4991 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4993 type = build_array_type (TREE_TYPE (type), 0);
4995 C_TYPE_VARIABLE_SIZE (type) = 1;
4998 /* If this is a type name (such as, in a cast or sizeof),
4999 compute the type and return it now. */
5001 if (decl_context == TYPENAME)
5003 /* Note that the grammar rejects storage classes
5004 in typenames, fields or parameters */
5005 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5006 && (constp || volatilep))
5007 pedwarn ("ANSI C forbids const or volatile function types");
5008 if (constp || volatilep)
5009 type = c_build_type_variant (type, constp, volatilep);
5014 /* Aside from typedefs and type names (handle above),
5015 `void' at top level (not within pointer)
5016 is allowed only in public variables.
5017 We don't complain about parms either, but that is because
5018 a better error message can be made later. */
5020 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5021 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5022 && ((specbits & (1 << (int) RID_EXTERN))
5023 || (current_binding_level == global_binding_level
5025 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5027 error ("variable or field `%s' declared void", name);
5028 type = integer_type_node;
5031 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5032 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5037 if (decl_context == PARM)
5039 tree type_as_written = type;
5042 /* A parameter declared as an array of T is really a pointer to T.
5043 One declared as a function is really a pointer to a function. */
5045 if (TREE_CODE (type) == ARRAY_TYPE)
5047 /* Transfer const-ness of array into that of type pointed to. */
5048 type = TREE_TYPE (type);
5049 if (constp || volatilep)
5050 type = c_build_type_variant (type, constp, volatilep);
5051 type = build_pointer_type (type);
5052 volatilep = constp = 0;
5055 else if (TREE_CODE (type) == FUNCTION_TYPE)
5057 if (pedantic && (constp || volatilep))
5058 pedwarn ("ANSI C forbids const or volatile function types");
5059 if (constp || volatilep)
5060 type = c_build_type_variant (type, constp, volatilep);
5061 type = build_pointer_type (type);
5062 volatilep = constp = 0;
5065 decl = build_decl (PARM_DECL, declarator, type);
5067 C_DECL_VARIABLE_SIZE (decl) = 1;
5069 /* Compute the type actually passed in the parmlist,
5070 for the case where there is no prototype.
5071 (For example, shorts and chars are passed as ints.)
5072 When there is a prototype, this is overridden later. */
5074 DECL_ARG_TYPE (decl) = type;
5075 main_type = (type == error_mark_node
5077 : TYPE_MAIN_VARIANT (type));
5078 if (main_type == float_type_node)
5079 DECL_ARG_TYPE (decl) = double_type_node;
5080 /* Don't use TYPE_PRECISION to decide whether to promote,
5081 because we should convert short if it's the same size as int,
5082 but we should not convert long if it's the same size as int. */
5083 else if (TREE_CODE (main_type) != ERROR_MARK
5084 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5086 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5087 && TREE_UNSIGNED (type))
5088 DECL_ARG_TYPE (decl) = unsigned_type_node;
5090 DECL_ARG_TYPE (decl) = integer_type_node;
5093 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5095 else if (decl_context == FIELD)
5097 /* Structure field. It may not be a function. */
5099 if (TREE_CODE (type) == FUNCTION_TYPE)
5101 error ("field `%s' declared as a function", name);
5102 type = build_pointer_type (type);
5104 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5106 error ("field `%s' has incomplete type", name);
5107 type = error_mark_node;
5109 /* Move type qualifiers down to element of an array. */
5110 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5112 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5114 TYPE_DOMAIN (type));
5115 #if 0 /* Leave the field const or volatile as well. */
5116 constp = volatilep = 0;
5119 decl = build_decl (FIELD_DECL, declarator, type);
5121 C_DECL_VARIABLE_SIZE (decl) = 1;
5123 else if (TREE_CODE (type) == FUNCTION_TYPE)
5125 /* Every function declaration is "external"
5126 except for those which are inside a function body
5127 in which `auto' is used.
5128 That is a case not specified by ANSI C,
5129 and we use it for forward declarations for nested functions. */
5130 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5131 || current_binding_level == global_binding_level);
5133 if (specbits & (1 << (int) RID_AUTO)
5134 && (pedantic || current_binding_level == global_binding_level))
5135 pedwarn ("invalid storage class for function `%s'", name);
5136 if (specbits & (1 << (int) RID_REGISTER))
5137 error ("invalid storage class for function `%s'", name);
5138 /* Function declaration not at top level.
5139 Storage classes other than `extern' are not allowed
5140 and `extern' makes no difference. */
5141 if (current_binding_level != global_binding_level
5142 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5144 pedwarn ("invalid storage class for function `%s'", name);
5146 /* If this is a block level extern, it must live past the end
5147 of the function so that we can check it against other
5148 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5149 if (extern_ref && allocation_temporary_p ())
5150 end_temporary_allocation ();
5152 decl = build_decl (FUNCTION_DECL, declarator, type);
5153 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5155 if (pedantic && (constp || volatilep)
5156 && ! DECL_IN_SYSTEM_HEADER (decl))
5157 pedwarn ("ANSI C forbids const or volatile functions");
5160 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5161 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5162 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5163 && ! DECL_IN_SYSTEM_HEADER (decl))
5164 pedwarn ("ANSI C forbids const or volatile void function return type");
5167 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5168 warning ("`noreturn' function returns non-void value");
5171 DECL_EXTERNAL (decl) = 1;
5172 /* Record absence of global scope for `static' or `auto'. */
5174 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5176 /* Record presence of `inline', if it is reasonable. */
5179 tree last = tree_last (TYPE_ARG_TYPES (type));
5181 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5182 warning ("cannot inline function `main'");
5184 /* Assume that otherwise the function can be inlined. */
5185 DECL_INLINE (decl) = 1;
5187 if (specbits & (1 << (int) RID_EXTERN))
5188 current_extern_inline = 1;
5193 /* It's a variable. */
5194 /* An uninitialized decl with `extern' is a reference. */
5195 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5197 /* Move type qualifiers down to element of an array. */
5198 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5200 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5202 TYPE_DOMAIN (type));
5203 #if 0 /* Leave the variable const or volatile as well. */
5204 constp = volatilep = 0;
5208 /* If this is a block level extern, it must live past the end
5209 of the function so that we can check it against other
5210 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5211 if (extern_ref && allocation_temporary_p ())
5212 end_temporary_allocation ();
5214 decl = build_decl (VAR_DECL, declarator, type);
5216 C_DECL_VARIABLE_SIZE (decl) = 1;
5219 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5221 DECL_EXTERNAL (decl) = extern_ref;
5222 /* At top level, the presence of a `static' or `register' storage
5223 class specifier, or the absence of all storage class specifiers
5224 makes this declaration a definition (perhaps tentative). Also,
5225 the absence of both `static' and `register' makes it public. */
5226 if (current_binding_level == global_binding_level)
5230 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5231 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5233 /* Not at top level, only `static' makes a static definition. */
5236 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5237 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5240 if (specbits & 1 << (int) RID_ITERATOR)
5241 ITERATOR_P (decl) = 1;
5244 /* Record `register' declaration for warnings on &
5245 and in case doing stupid register allocation. */
5247 if (specbits & (1 << (int) RID_REGISTER))
5248 DECL_REGISTER (decl) = 1;
5250 /* Record constancy and volatility. */
5253 TREE_READONLY (decl) = 1;
5256 TREE_SIDE_EFFECTS (decl) = 1;
5257 TREE_THIS_VOLATILE (decl) = 1;
5259 /* If a type has volatile components, it should be stored in memory.
5260 Otherwise, the fact that those components are volatile
5261 will be ignored, and would even crash the compiler. */
5262 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5263 mark_addressable (decl);
5271 /* Decode the parameter-list info for a function type or function definition.
5272 The argument is the value returned by `get_parm_info' (or made in parse.y
5273 if there is an identifier list instead of a parameter decl list).
5274 These two functions are separate because when a function returns
5275 or receives functions then each is called multiple times but the order
5276 of calls is different. The last call to `grokparms' is always the one
5277 that contains the formal parameter names of a function definition.
5279 Store in `last_function_parms' a chain of the decls of parms.
5280 Also store in `last_function_parm_tags' a chain of the struct, union,
5281 and enum tags declared among the parms.
5283 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5285 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5286 a mere declaration. A nonempty identifier-list gets an error message
5287 when FUNCDEF_FLAG is zero. */
5290 grokparms (parms_info, funcdef_flag)
5294 tree first_parm = TREE_CHAIN (parms_info);
5296 last_function_parms = TREE_PURPOSE (parms_info);
5297 last_function_parm_tags = TREE_VALUE (parms_info);
5299 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5300 && !in_system_header)
5301 warning ("function declaration isn't a prototype");
5304 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5307 pedwarn ("parameter names (without types) in function declaration");
5309 last_function_parms = first_parm;
5316 /* We no longer test FUNCDEF_FLAG.
5317 If the arg types are incomplete in a declaration,
5318 they must include undefined tags.
5319 These tags can never be defined in the scope of the declaration,
5320 so the types can never be completed,
5321 and no call can be compiled successfully. */
5323 /* In a fcn definition, arg types must be complete. */
5326 for (parm = last_function_parms, typelt = first_parm;
5328 parm = TREE_CHAIN (parm))
5329 /* Skip over any enumeration constants declared here. */
5330 if (TREE_CODE (parm) == PARM_DECL)
5332 /* Barf if the parameter itself has an incomplete type. */
5333 tree type = TREE_VALUE (typelt);
5334 if (TYPE_SIZE (type) == 0)
5336 if (funcdef_flag && DECL_NAME (parm) != 0)
5337 error ("parameter `%s' has incomplete type",
5338 IDENTIFIER_POINTER (DECL_NAME (parm)));
5340 warning ("parameter has incomplete type");
5343 TREE_VALUE (typelt) = error_mark_node;
5344 TREE_TYPE (parm) = error_mark_node;
5347 #if 0 /* This has been replaced by parm_tags_warning
5348 which uses a more accurate criterion for what to warn about. */
5351 /* Now warn if is a pointer to an incomplete type. */
5352 while (TREE_CODE (type) == POINTER_TYPE
5353 || TREE_CODE (type) == REFERENCE_TYPE)
5354 type = TREE_TYPE (type);
5355 type = TYPE_MAIN_VARIANT (type);
5356 if (TYPE_SIZE (type) == 0)
5358 if (DECL_NAME (parm) != 0)
5359 warning ("parameter `%s' points to incomplete type",
5360 IDENTIFIER_POINTER (DECL_NAME (parm)));
5362 warning ("parameter points to incomplete type");
5366 typelt = TREE_CHAIN (typelt);
5369 /* Allocate the list of types the way we allocate a type. */
5370 if (first_parm && ! TREE_PERMANENT (first_parm))
5372 /* Construct a copy of the list of types
5373 on the saveable obstack. */
5375 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5376 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5378 return nreverse (result);
5381 /* The list we have is permanent already. */
5387 /* Return a tree_list node with info on a parameter list just parsed.
5388 The TREE_PURPOSE is a chain of decls of those parms.
5389 The TREE_VALUE is a list of structure, union and enum tags defined.
5390 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5391 This tree_list node is later fed to `grokparms'.
5393 VOID_AT_END nonzero means append `void' to the end of the type-list.
5394 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5397 get_parm_info (void_at_end)
5400 register tree decl, t;
5401 register tree types = 0;
5403 tree tags = gettags ();
5404 tree parms = getdecls ();
5406 tree order = current_binding_level->parm_order;
5408 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5409 if (void_at_end && parms != 0
5410 && TREE_CHAIN (parms) == 0
5411 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5412 && DECL_NAME (parms) == 0)
5415 storedecls (NULL_TREE);
5416 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5417 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5420 /* Extract enumerator values and other non-parms declared with the parms.
5421 Likewise any forward parm decls that didn't have real parm decls. */
5422 for (decl = parms; decl; )
5424 tree next = TREE_CHAIN (decl);
5426 if (TREE_CODE (decl) != PARM_DECL)
5428 TREE_CHAIN (decl) = new_parms;
5431 else if (TREE_ASM_WRITTEN (decl))
5433 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5434 TREE_CHAIN (decl) = new_parms;
5440 /* Put the parm decls back in the order they were in in the parm list. */
5441 for (t = order; t; t = TREE_CHAIN (t))
5444 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5446 TREE_CHAIN (TREE_VALUE (t)) = 0;
5449 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5452 /* Store the parmlist in the binding level since the old one
5453 is no longer a valid list. (We have changed the chain pointers.) */
5454 storedecls (new_parms);
5456 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5457 /* There may also be declarations for enumerators if an enumeration
5458 type is declared among the parms. Ignore them here. */
5459 if (TREE_CODE (decl) == PARM_DECL)
5461 /* Since there is a prototype,
5462 args are passed in their declared types. */
5463 tree type = TREE_TYPE (decl);
5464 DECL_ARG_TYPE (decl) = type;
5465 #ifdef PROMOTE_PROTOTYPES
5466 if ((TREE_CODE (type) == INTEGER_TYPE
5467 || TREE_CODE (type) == ENUMERAL_TYPE)
5468 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5469 DECL_ARG_TYPE (decl) = integer_type_node;
5472 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5473 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5474 && DECL_NAME (decl) == 0)
5476 error ("`void' in parameter list must be the entire list");
5482 return saveable_tree_cons (new_parms, tags,
5483 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5485 return saveable_tree_cons (new_parms, tags, nreverse (types));
5488 /* At end of parameter list, warn about any struct, union or enum tags
5489 defined within. Do so because these types cannot ever become complete. */
5492 parmlist_tags_warning ()
5497 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5499 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5500 /* An anonymous union parm type is meaningful as a GNU extension.
5501 So don't warn for that. */
5502 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5504 if (TREE_PURPOSE (elt) != 0)
5505 warning ("`%s %s' declared inside parameter list",
5506 (code == RECORD_TYPE ? "struct"
5507 : code == UNION_TYPE ? "union"
5509 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5511 warning ("anonymous %s declared inside parameter list",
5512 (code == RECORD_TYPE ? "struct"
5513 : code == UNION_TYPE ? "union"
5518 warning ("its scope is only this definition or declaration,");
5519 warning ("which is probably not what you want.");
5525 /* Get the struct, enum or union (CODE says which) with tag NAME.
5526 Define the tag as a forward-reference if it is not defined. */
5529 xref_tag (code, name)
5530 enum tree_code code;
5533 int temporary = allocation_temporary_p ();
5535 /* If a cross reference is requested, look up the type
5536 already defined for this tag and return it. */
5538 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5539 /* Even if this is the wrong type of tag, return what we found.
5540 There will be an error message anyway, from pending_xref_error.
5541 If we create an empty xref just for an invalid use of the type,
5542 the main result is to create lots of superfluous error messages. */
5546 push_obstacks_nochange ();
5548 if (current_binding_level == global_binding_level && temporary)
5549 end_temporary_allocation ();
5551 /* If no such tag is yet defined, create a forward-reference node
5552 and record it as the "definition".
5553 When a real declaration of this type is found,
5554 the forward-reference will be altered into a real type. */
5556 ref = make_node (code);
5557 if (code == ENUMERAL_TYPE)
5559 /* (In ANSI, Enums can be referred to only if already defined.) */
5561 pedwarn ("ANSI C forbids forward references to `enum' types");
5562 /* Give the type a default layout like unsigned int
5563 to avoid crashing if it does not get defined. */
5564 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5565 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5566 TREE_UNSIGNED (ref) = 1;
5567 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5568 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5569 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5572 pushtag (name, ref);
5579 /* Make sure that the tag NAME is defined *in the current binding level*
5580 at least as a forward reference.
5581 CODE says which kind of tag NAME ought to be.
5583 We also do a push_obstacks_nochange
5584 whose matching pop is in finish_struct. */
5587 start_struct (code, name)
5588 enum tree_code code;
5591 /* If there is already a tag defined at this binding level
5592 (as a forward reference), just return it. */
5594 register tree ref = 0;
5596 push_obstacks_nochange ();
5597 if (current_binding_level == global_binding_level)
5598 end_temporary_allocation ();
5601 ref = lookup_tag (code, name, current_binding_level, 1);
5602 if (ref && TREE_CODE (ref) == code)
5604 C_TYPE_BEING_DEFINED (ref) = 1;
5605 TYPE_PACKED (ref) = flag_pack_struct;
5606 if (TYPE_FIELDS (ref))
5607 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5608 : "redefinition of `struct %s'"),
5609 IDENTIFIER_POINTER (name));
5614 /* Otherwise create a forward-reference just so the tag is in scope. */
5616 ref = make_node (code);
5617 pushtag (name, ref);
5618 C_TYPE_BEING_DEFINED (ref) = 1;
5619 TYPE_PACKED (ref) = flag_pack_struct;
5623 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5624 of a structure component, returning a FIELD_DECL node.
5625 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5627 This is done during the parsing of the struct declaration.
5628 The FIELD_DECL nodes are chained together and the lot of them
5629 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5632 grokfield (filename, line, declarator, declspecs, width)
5635 tree declarator, declspecs, width;
5639 /* The corresponding pop_obstacks is in finish_decl. */
5640 push_obstacks_nochange ();
5642 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5644 finish_decl (value, NULL_TREE, NULL_TREE);
5645 DECL_INITIAL (value) = width;
5647 maybe_objc_check_decl (value);
5651 /* Function to help qsort sort FIELD_DECLs by name order. */
5654 field_decl_cmp (xp, yp)
5655 const GENERIC_PTR xp;
5656 const GENERIC_PTR yp;
5658 tree *x = (tree *)xp, *y = (tree *)yp;
5660 if (DECL_NAME (*x) == DECL_NAME (*y))
5662 if (DECL_NAME (*x) == NULL)
5664 if (DECL_NAME (*y) == NULL)
5666 if (DECL_NAME (*x) < DECL_NAME (*y))
5671 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5672 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5673 ATTRIBUTES are attributes to be applied to the structure.
5675 We also do a pop_obstacks to match the push in start_struct. */
5678 finish_struct (t, fieldlist, attributes)
5685 int toplevel = global_binding_level == current_binding_level;
5687 /* If this type was previously laid out as a forward reference,
5688 make sure we lay it out again. */
5692 decl_attributes (t, attributes, NULL_TREE);
5694 /* Nameless union parm types are useful as GCC extension. */
5695 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5696 /* Otherwise, warn about any struct or union def. in parmlist. */
5697 if (in_parm_level_p ())
5700 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5701 : "structure defined inside parms"));
5702 else if (! flag_traditional)
5703 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5704 : "structure defined inside parms"));
5707 old_momentary = suspend_momentary ();
5711 for (x = fieldlist; x; x = TREE_CHAIN (x))
5712 if (DECL_NAME (x) != 0)
5716 pedwarn ("%s has no %smembers",
5717 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5718 (fieldlist ? "named " : ""));
5721 /* Install struct as DECL_CONTEXT of each field decl.
5722 Also process specified field sizes.
5723 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5724 The specified size is found in the DECL_INITIAL.
5725 Store 0 there, except for ": 0" fields (so we can find them
5726 and delete them, below). */
5728 for (x = fieldlist; x; x = TREE_CHAIN (x))
5730 DECL_CONTEXT (x) = t;
5731 DECL_PACKED (x) |= TYPE_PACKED (t);
5732 DECL_FIELD_SIZE (x) = 0;
5734 /* If any field is const, the structure type is pseudo-const. */
5735 if (TREE_READONLY (x))
5736 C_TYPE_FIELDS_READONLY (t) = 1;
5739 /* A field that is pseudo-const makes the structure likewise. */
5740 tree t1 = TREE_TYPE (x);
5741 while (TREE_CODE (t1) == ARRAY_TYPE)
5742 t1 = TREE_TYPE (t1);
5743 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5744 && C_TYPE_FIELDS_READONLY (t1))
5745 C_TYPE_FIELDS_READONLY (t) = 1;
5748 /* Any field that is volatile means variables of this type must be
5749 treated in some ways as volatile. */
5750 if (TREE_THIS_VOLATILE (x))
5751 C_TYPE_FIELDS_VOLATILE (t) = 1;
5753 /* Any field of nominal variable size implies structure is too. */
5754 if (C_DECL_VARIABLE_SIZE (x))
5755 C_TYPE_VARIABLE_SIZE (t) = 1;
5757 /* Detect invalid nested redefinition. */
5758 if (TREE_TYPE (x) == t)
5759 error ("nested redefinition of `%s'",
5760 IDENTIFIER_POINTER (TYPE_NAME (t)));
5762 /* Detect invalid bit-field size. */
5763 if (DECL_INITIAL (x))
5764 STRIP_NOPS (DECL_INITIAL (x));
5765 if (DECL_INITIAL (x))
5767 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5768 constant_expression_warning (DECL_INITIAL (x));
5771 error_with_decl (x, "bit-field `%s' width not an integer constant");
5772 DECL_INITIAL (x) = NULL;
5776 /* Detect invalid bit-field type. */
5777 if (DECL_INITIAL (x)
5778 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5779 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5781 error_with_decl (x, "bit-field `%s' has invalid type");
5782 DECL_INITIAL (x) = NULL;
5784 if (DECL_INITIAL (x) && pedantic
5785 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5786 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5787 /* Accept an enum that's equivalent to int or unsigned int. */
5788 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5789 && (TYPE_PRECISION (TREE_TYPE (x))
5790 == TYPE_PRECISION (integer_type_node))))
5791 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5793 /* Detect and ignore out of range field width. */
5794 if (DECL_INITIAL (x))
5796 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5798 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5800 DECL_INITIAL (x) = NULL;
5801 error_with_decl (x, "negative width in bit-field `%s'");
5803 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5804 || width > TYPE_PRECISION (TREE_TYPE (x)))
5806 DECL_INITIAL (x) = NULL;
5807 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5809 else if (width == 0 && DECL_NAME (x) != 0)
5811 error_with_decl (x, "zero width for bit-field `%s'");
5812 DECL_INITIAL (x) = NULL;
5816 /* Process valid field width. */
5817 if (DECL_INITIAL (x))
5819 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5821 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5822 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5823 TREE_UNSIGNED (TREE_TYPE (x)))
5824 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5825 TREE_UNSIGNED (TREE_TYPE (x)))))
5826 warning_with_decl (x, "`%s' is narrower than values of its type");
5828 DECL_FIELD_SIZE (x) = width;
5829 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5830 DECL_INITIAL (x) = NULL;
5834 /* field size 0 => force desired amount of alignment. */
5835 #ifdef EMPTY_FIELD_BOUNDARY
5836 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5838 #ifdef PCC_BITFIELD_TYPE_MATTERS
5839 if (PCC_BITFIELD_TYPE_MATTERS)
5840 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5841 TYPE_ALIGN (TREE_TYPE (x)));
5845 else if (TREE_TYPE (x) != error_mark_node)
5847 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5848 : TYPE_ALIGN (TREE_TYPE (x)));
5849 /* Non-bit-fields are aligned for their type, except packed
5850 fields which require only BITS_PER_UNIT alignment. */
5851 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5855 /* Now DECL_INITIAL is null on all members. */
5857 /* Delete all duplicate fields from the fieldlist */
5858 for (x = fieldlist; x && TREE_CHAIN (x);)
5859 /* Anonymous fields aren't duplicates. */
5860 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5864 register tree y = fieldlist;
5868 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5874 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5876 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5877 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5879 else x = TREE_CHAIN (x);
5882 /* Now we have the nearly final fieldlist. Record it,
5883 then lay out the structure or union (including the fields). */
5885 TYPE_FIELDS (t) = fieldlist;
5889 /* Delete all zero-width bit-fields from the front of the fieldlist */
5891 && DECL_INITIAL (fieldlist))
5892 fieldlist = TREE_CHAIN (fieldlist);
5893 /* Delete all such members from the rest of the fieldlist */
5894 for (x = fieldlist; x;)
5896 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5897 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5898 else x = TREE_CHAIN (x);
5901 /* Now we have the truly final field list.
5902 Store it in this type and in the variants. */
5904 TYPE_FIELDS (t) = fieldlist;
5906 /* If there are lots of fields, sort so we can look through them fast.
5907 We arbitrarily consider 16 or more elts to be "a lot". */
5911 for (x = fieldlist; x; x = TREE_CHAIN (x))
5922 len += list_length (x);
5923 /* Use the same allocation policy here that make_node uses, to
5924 ensure that this lives as long as the rest of the struct decl.
5925 All decls in an inline function need to be saved. */
5926 if (allocation_temporary_p ())
5927 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5929 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5931 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5932 TYPE_LANG_SPECIFIC (t)->len = len;
5934 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5936 for (x = fieldlist; x; x = TREE_CHAIN (x))
5937 field_array[len++] = x;
5939 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5943 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5945 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5946 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5947 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5950 /* If this was supposed to be a transparent union, but we can't
5951 make it one, warn and turn off the flag. */
5952 if (TREE_CODE (t) == UNION_TYPE
5953 && TYPE_TRANSPARENT_UNION (t)
5954 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5956 TYPE_TRANSPARENT_UNION (t) = 0;
5957 warning ("union cannot be made transparent");
5960 /* If this structure or union completes the type of any previous
5961 variable declaration, lay it out and output its rtl. */
5963 if (current_binding_level->n_incomplete != 0)
5966 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5968 if (TREE_TYPE (decl) == t
5969 && TREE_CODE (decl) != TYPE_DECL)
5971 layout_decl (decl, 0);
5972 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5973 maybe_objc_check_decl (decl);
5974 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5977 --current_binding_level->n_incomplete;
5979 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5980 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5982 tree element = TREE_TYPE (decl);
5983 while (TREE_CODE (element) == ARRAY_TYPE)
5984 element = TREE_TYPE (element);
5986 layout_array_type (TREE_TYPE (decl));
5991 resume_momentary (old_momentary);
5993 /* Finish debugging output for this type. */
5994 rest_of_type_compilation (t, toplevel);
5996 /* The matching push is in start_struct. */
6002 /* Lay out the type T, and its element type, and so on. */
6005 layout_array_type (t)
6008 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6009 layout_array_type (TREE_TYPE (t));
6013 /* Begin compiling the definition of an enumeration type.
6014 NAME is its name (or null if anonymous).
6015 Returns the type object, as yet incomplete.
6016 Also records info about it so that build_enumerator
6017 may be used to declare the individual values as they are read. */
6023 register tree enumtype = 0;
6025 /* If this is the real definition for a previous forward reference,
6026 fill in the contents in the same object that used to be the
6027 forward reference. */
6030 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6032 /* The corresponding pop_obstacks is in finish_enum. */
6033 push_obstacks_nochange ();
6034 /* If these symbols and types are global, make them permanent. */
6035 if (current_binding_level == global_binding_level)
6036 end_temporary_allocation ();
6038 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6040 enumtype = make_node (ENUMERAL_TYPE);
6041 pushtag (name, enumtype);
6044 C_TYPE_BEING_DEFINED (enumtype) = 1;
6046 if (TYPE_VALUES (enumtype) != 0)
6048 /* This enum is a named one that has been declared already. */
6049 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6051 /* Completely replace its old definition.
6052 The old enumerators remain defined, however. */
6053 TYPE_VALUES (enumtype) = 0;
6056 enum_next_value = integer_zero_node;
6059 if (flag_short_enums)
6060 TYPE_PACKED (enumtype) = 1;
6065 /* After processing and defining all the values of an enumeration type,
6066 install their decls in the enumeration type and finish it off.
6067 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6068 and ATTRIBUTES are the specified attributes.
6069 Returns ENUMTYPE. */
6072 finish_enum (enumtype, values, attributes)
6077 register tree pair, tem;
6078 tree minnode = 0, maxnode = 0;
6079 int lowprec, highprec, precision;
6080 int toplevel = global_binding_level == current_binding_level;
6082 if (in_parm_level_p ())
6083 warning ("enum defined inside parms");
6085 decl_attributes (enumtype, attributes, NULL_TREE);
6087 /* Calculate the maximum value of any enumerator in this type. */
6089 if (values == error_mark_node)
6090 minnode = maxnode = integer_zero_node;
6092 for (pair = values; pair; pair = TREE_CHAIN (pair))
6094 tree value = TREE_VALUE (pair);
6096 minnode = maxnode = TREE_VALUE (pair);
6099 if (tree_int_cst_lt (maxnode, value))
6101 if (tree_int_cst_lt (value, minnode))
6106 TYPE_MIN_VALUE (enumtype) = minnode;
6107 TYPE_MAX_VALUE (enumtype) = maxnode;
6109 /* An enum can have some negative values; then it is signed. */
6110 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6112 /* Determine the precision this type needs. */
6114 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6115 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6116 precision = MAX (lowprec, highprec);
6118 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6120 tree narrowest = type_for_size (precision, 1);
6123 warning ("enumeration values exceed range of largest integer");
6124 narrowest = long_long_integer_type_node;
6127 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6130 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6132 TYPE_SIZE (enumtype) = 0;
6133 layout_type (enumtype);
6135 if (values != error_mark_node)
6137 /* Change the type of the enumerators to be the enum type.
6138 Formerly this was done only for enums that fit in an int,
6139 but the comment said it was done only for enums wider than int.
6140 It seems necessary to do this for wide enums,
6141 and best not to change what's done for ordinary narrower ones. */
6142 for (pair = values; pair; pair = TREE_CHAIN (pair))
6144 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6145 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6146 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6147 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6150 /* Replace the decl nodes in VALUES with their names. */
6151 for (pair = values; pair; pair = TREE_CHAIN (pair))
6152 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6154 TYPE_VALUES (enumtype) = values;
6157 /* Fix up all variant types of this enum type. */
6158 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6160 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6161 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6162 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6163 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6164 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6165 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6166 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6167 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6170 /* Finish debugging output for this type. */
6171 rest_of_type_compilation (enumtype, toplevel);
6173 /* This matches a push in start_enum. */
6179 /* Build and install a CONST_DECL for one value of the
6180 current enumeration type (one that was begun with start_enum).
6181 Return a tree-list containing the CONST_DECL and its value.
6182 Assignment of sequential values by default is handled here. */
6185 build_enumerator (name, value)
6188 register tree decl, type;
6190 /* Validate and default VALUE. */
6192 /* Remove no-op casts from the value. */
6194 STRIP_TYPE_NOPS (value);
6198 if (TREE_CODE (value) == INTEGER_CST)
6200 value = default_conversion (value);
6201 constant_expression_warning (value);
6205 error ("enumerator value for `%s' not integer constant",
6206 IDENTIFIER_POINTER (name));
6211 /* Default based on previous value. */
6212 /* It should no longer be possible to have NON_LVALUE_EXPR
6216 value = enum_next_value;
6218 error ("overflow in enumeration values");
6221 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6223 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6224 value = integer_zero_node;
6227 /* Set basis for default for next value. */
6228 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6229 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6231 /* Now create a declaration for the enum value name. */
6233 type = TREE_TYPE (value);
6234 type = type_for_size (MAX (TYPE_PRECISION (type),
6235 TYPE_PRECISION (integer_type_node)),
6237 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6238 && TREE_UNSIGNED (type)));
6240 decl = build_decl (CONST_DECL, name, type);
6241 DECL_INITIAL (decl) = value;
6242 TREE_TYPE (value) = type;
6245 return saveable_tree_cons (decl, value, NULL_TREE);
6248 /* Create the FUNCTION_DECL for a function definition.
6249 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6250 the declaration; they describe the function's name and the type it returns,
6251 but twisted together in a fashion that parallels the syntax of C.
6253 This function creates a binding context for the function body
6254 as well as setting up the FUNCTION_DECL in current_function_decl.
6256 Returns 1 on success. If the DECLARATOR is not suitable for a function
6257 (it defines a datum instead), we return 0, which tells
6258 yyparse to report a parse error.
6260 NESTED is nonzero for a function nested within another function. */
6263 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6264 tree declarator, declspecs, prefix_attributes, attributes;
6267 tree decl1, old_decl;
6269 int old_immediate_size_expand = immediate_size_expand;
6271 current_function_returns_value = 0; /* Assume, until we see it does. */
6272 current_function_returns_null = 0;
6273 warn_about_return_type = 0;
6274 current_extern_inline = 0;
6275 c_function_varargs = 0;
6277 shadowed_labels = 0;
6279 /* Don't expand any sizes in the return type of the function. */
6280 immediate_size_expand = 0;
6282 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6284 /* If the declarator is not suitable for a function definition,
6285 cause a syntax error. */
6288 immediate_size_expand = old_immediate_size_expand;
6292 decl_attributes (decl1, prefix_attributes, attributes);
6294 announce_function (decl1);
6296 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6298 error ("return-type is an incomplete type");
6299 /* Make it return void instead. */
6301 = build_function_type (void_type_node,
6302 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6305 if (warn_about_return_type)
6306 warning ("return-type defaults to `int'");
6308 /* Save the parm names or decls from this function's declarator
6309 where store_parm_decls will find them. */
6310 current_function_parms = last_function_parms;
6311 current_function_parm_tags = last_function_parm_tags;
6313 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6314 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6315 DECL_INITIAL (decl1) = error_mark_node;
6317 /* If this definition isn't a prototype and we had a prototype declaration
6318 before, copy the arg type info from that prototype.
6319 But not if what we had before was a builtin function. */
6320 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6321 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6322 && !DECL_BUILT_IN (old_decl)
6323 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6324 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6325 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6327 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6328 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6329 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6332 /* If there is no explicit declaration, look for any out-of-scope implicit
6335 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6337 /* Optionally warn of old-fashioned def with no previous prototype. */
6338 if (warn_strict_prototypes
6339 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6340 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6341 warning ("function declaration isn't a prototype");
6342 /* Optionally warn of any global def with no previous prototype. */
6343 else if (warn_missing_prototypes
6344 && TREE_PUBLIC (decl1)
6345 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6346 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6347 warning_with_decl (decl1, "no previous prototype for `%s'");
6348 /* Optionally warn of any def with no previous prototype
6349 if the function has already been used. */
6350 else if (warn_missing_prototypes
6351 && old_decl != 0 && TREE_USED (old_decl)
6352 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6353 warning_with_decl (decl1,
6354 "`%s' was used with no prototype before its definition");
6355 /* Optionally warn of any global def with no previous declaration. */
6356 else if (warn_missing_declarations
6357 && TREE_PUBLIC (decl1)
6359 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6360 warning_with_decl (decl1, "no previous declaration for `%s'");
6361 /* Optionally warn of any def with no previous declaration
6362 if the function has already been used. */
6363 else if (warn_missing_declarations
6364 && old_decl != 0 && TREE_USED (old_decl)
6365 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6366 warning_with_decl (decl1,
6367 "`%s' was used with no declaration before its definition");
6369 /* This is a definition, not a reference.
6370 So normally clear DECL_EXTERNAL.
6371 However, `extern inline' acts like a declaration
6372 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6373 DECL_EXTERNAL (decl1) = current_extern_inline;
6375 /* This function exists in static storage.
6376 (This does not mean `static' in the C sense!) */
6377 TREE_STATIC (decl1) = 1;
6379 /* A nested function is not global. */
6380 if (current_function_decl != 0)
6381 TREE_PUBLIC (decl1) = 0;
6383 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6385 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6390 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6391 != integer_type_node)
6392 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6394 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6395 args = TREE_CHAIN (args))
6397 tree type = args ? TREE_VALUE (args) : 0;
6399 if (type == void_type_node)
6406 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6407 pedwarn_with_decl (decl1,
6408 "first argument of `%s' should be `int'");
6412 if (TREE_CODE (type) != POINTER_TYPE
6413 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6414 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6416 pedwarn_with_decl (decl1,
6417 "second argument of `%s' should be `char **'");
6421 if (TREE_CODE (type) != POINTER_TYPE
6422 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6423 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6425 pedwarn_with_decl (decl1,
6426 "third argument of `%s' should probably be `char **'");
6431 /* It is intentional that this message does not mention the third
6432 argument, which is warned for only pedantically, because it's
6433 blessed by mention in an appendix of the standard. */
6434 if (argct > 0 && (argct < 2 || argct > 3))
6435 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6437 if (argct == 3 && pedantic)
6438 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6440 if (! TREE_PUBLIC (decl1))
6441 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6444 /* Record the decl so that the function name is defined.
6445 If we already have a decl for this name, and it is a FUNCTION_DECL,
6446 use the old decl. */
6448 current_function_decl = pushdecl (decl1);
6451 declare_parm_level (1);
6452 current_binding_level->subblocks_tag_transparent = 1;
6454 make_function_rtl (current_function_decl);
6456 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6457 /* Promote the value to int before returning it. */
6458 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6460 /* It retains unsignedness if traditional
6461 or if not really getting wider. */
6462 if (TREE_UNSIGNED (restype)
6463 && (flag_traditional
6464 || (TYPE_PRECISION (restype)
6465 == TYPE_PRECISION (integer_type_node))))
6466 restype = unsigned_type_node;
6468 restype = integer_type_node;
6470 DECL_RESULT (current_function_decl)
6471 = build_decl (RESULT_DECL, NULL_TREE, restype);
6474 /* Allocate further tree nodes temporarily during compilation
6475 of this function only. */
6476 temporary_allocation ();
6478 /* If this fcn was already referenced via a block-scope `extern' decl
6479 (or an implicit decl), propagate certain information about the usage. */
6480 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6481 TREE_ADDRESSABLE (current_function_decl) = 1;
6483 immediate_size_expand = old_immediate_size_expand;
6488 /* Record that this function is going to be a varargs function.
6489 This is called before store_parm_decls, which is too early
6490 to call mark_varargs directly. */
6495 c_function_varargs = 1;
6498 /* Store the parameter declarations into the current function declaration.
6499 This is called after parsing the parameter declarations, before
6500 digesting the body of the function.
6502 For an old-style definition, modify the function's type
6503 to specify at least the number of arguments. */
6508 register tree fndecl = current_function_decl;
6511 /* This is either a chain of PARM_DECLs (if a prototype was used)
6512 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6513 tree specparms = current_function_parms;
6515 /* This is a list of types declared among parms in a prototype. */
6516 tree parmtags = current_function_parm_tags;
6518 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6519 register tree parmdecls = getdecls ();
6521 /* This is a chain of any other decls that came in among the parm
6522 declarations. If a parm is declared with enum {foo, bar} x;
6523 then CONST_DECLs for foo and bar are put here. */
6526 /* Nonzero if this definition is written with a prototype. */
6529 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6531 /* This case is when the function was defined with an ANSI prototype.
6532 The parms already have decls, so we need not do anything here
6533 except record them as in effect
6534 and complain if any redundant old-style parm decls were written. */
6545 error_with_decl (fndecl,
6546 "parm types given both in parmlist and separately");
6547 /* Get rid of the erroneous decls; don't keep them on
6548 the list of parms, since they might not be PARM_DECLs. */
6549 for (decl = current_binding_level->names;
6550 decl; decl = TREE_CHAIN (decl))
6551 if (DECL_NAME (decl))
6552 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6553 for (link = current_binding_level->shadowed;
6554 link; link = TREE_CHAIN (link))
6555 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6556 current_binding_level->names = 0;
6557 current_binding_level->shadowed = 0;
6560 specparms = nreverse (specparms);
6561 for (parm = specparms; parm; parm = next)
6563 next = TREE_CHAIN (parm);
6564 if (TREE_CODE (parm) == PARM_DECL)
6566 if (DECL_NAME (parm) == 0)
6567 error_with_decl (parm, "parameter name omitted");
6568 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6570 error_with_decl (parm, "parameter `%s' declared void");
6571 /* Change the type to error_mark_node so this parameter
6572 will be ignored by assign_parms. */
6573 TREE_TYPE (parm) = error_mark_node;
6579 /* If we find an enum constant or a type tag,
6580 put it aside for the moment. */
6581 TREE_CHAIN (parm) = 0;
6582 others = chainon (others, parm);
6586 /* Get the decls in their original chain order
6587 and record in the function. */
6588 DECL_ARGUMENTS (fndecl) = getdecls ();
6591 /* If this function takes a variable number of arguments,
6592 add a phony parameter to the end of the parm list,
6593 to represent the position of the first unnamed argument. */
6594 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6597 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6598 /* Let's hope the address of the unnamed parm
6599 won't depend on its type. */
6600 TREE_TYPE (dummy) = integer_type_node;
6601 DECL_ARG_TYPE (dummy) = integer_type_node;
6602 DECL_ARGUMENTS (fndecl)
6603 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6607 /* Now pushdecl the enum constants. */
6608 for (parm = others; parm; parm = next)
6610 next = TREE_CHAIN (parm);
6611 if (DECL_NAME (parm) == 0)
6613 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6615 else if (TREE_CODE (parm) != PARM_DECL)
6619 storetags (chainon (parmtags, gettags ()));
6623 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6624 each with a parm name as the TREE_VALUE.
6626 PARMDECLS is a chain of declarations for parameters.
6627 Warning! It can also contain CONST_DECLs which are not parameters
6628 but are names of enumerators of any enum types
6629 declared among the parameters.
6631 First match each formal parameter name with its declaration.
6632 Associate decls with the names and store the decls
6633 into the TREE_PURPOSE slots. */
6635 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6636 DECL_RESULT (parm) = 0;
6638 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6640 register tree tail, found = NULL;
6642 if (TREE_VALUE (parm) == 0)
6644 error_with_decl (fndecl, "parameter name missing from parameter list");
6645 TREE_PURPOSE (parm) = 0;
6649 /* See if any of the parmdecls specifies this parm by name.
6650 Ignore any enumerator decls. */
6651 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6652 if (DECL_NAME (tail) == TREE_VALUE (parm)
6653 && TREE_CODE (tail) == PARM_DECL)
6659 /* If declaration already marked, we have a duplicate name.
6660 Complain, and don't use this decl twice. */
6661 if (found && DECL_RESULT (found) != 0)
6663 error_with_decl (found, "multiple parameters named `%s'");
6667 /* If the declaration says "void", complain and ignore it. */
6668 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6670 error_with_decl (found, "parameter `%s' declared void");
6671 TREE_TYPE (found) = integer_type_node;
6672 DECL_ARG_TYPE (found) = integer_type_node;
6673 layout_decl (found, 0);
6676 /* Traditionally, a parm declared float is actually a double. */
6677 if (found && flag_traditional
6678 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6680 TREE_TYPE (found) = double_type_node;
6681 DECL_ARG_TYPE (found) = double_type_node;
6682 layout_decl (found, 0);
6685 /* If no declaration found, default to int. */
6688 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6690 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6691 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6692 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6694 warning_with_decl (found, "type of `%s' defaults to `int'");
6698 TREE_PURPOSE (parm) = found;
6700 /* Mark this decl as "already found" -- see test, above.
6701 It is safe to use DECL_RESULT for this
6702 since it is not used in PARM_DECLs or CONST_DECLs. */
6703 DECL_RESULT (found) = error_mark_node;
6706 /* Put anything which is on the parmdecls chain and which is
6707 not a PARM_DECL onto the list NONPARMS. (The types of
6708 non-parm things which might appear on the list include
6709 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6710 any actual PARM_DECLs not matched with any names. */
6713 for (parm = parmdecls; parm; )
6715 tree next = TREE_CHAIN (parm);
6716 TREE_CHAIN (parm) = 0;
6718 if (TREE_CODE (parm) != PARM_DECL)
6719 nonparms = chainon (nonparms, parm);
6722 /* Complain about args with incomplete types. */
6723 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6725 error_with_decl (parm, "parameter `%s' has incomplete type");
6726 TREE_TYPE (parm) = error_mark_node;
6729 if (DECL_RESULT (parm) == 0)
6731 error_with_decl (parm,
6732 "declaration for parameter `%s' but no such parameter");
6733 /* Pretend the parameter was not missing.
6734 This gets us to a standard state and minimizes
6735 further error messages. */
6737 = chainon (specparms,
6738 tree_cons (parm, NULL_TREE, NULL_TREE));
6745 /* Chain the declarations together in the order of the list of names. */
6746 /* Store that chain in the function decl, replacing the list of names. */
6748 DECL_ARGUMENTS (fndecl) = 0;
6751 for (last = 0; parm; parm = TREE_CHAIN (parm))
6752 if (TREE_PURPOSE (parm))
6755 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6757 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6758 last = TREE_PURPOSE (parm);
6759 TREE_CHAIN (last) = 0;
6763 /* If there was a previous prototype,
6764 set the DECL_ARG_TYPE of each argument according to
6765 the type previously specified, and report any mismatches. */
6767 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6770 for (parm = DECL_ARGUMENTS (fndecl),
6771 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6772 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6773 != void_type_node));
6774 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6776 if (parm == 0 || type == 0
6777 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6779 error ("number of arguments doesn't match prototype");
6780 error_with_file_and_line (current_function_prototype_file,
6781 current_function_prototype_line,
6782 "prototype declaration");
6785 /* Type for passing arg must be consistent
6786 with that declared for the arg. */
6787 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6789 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6790 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6792 /* Adjust argument to match prototype. E.g. a previous
6793 `int foo(float);' prototype causes
6794 `int foo(x) float x; {...}' to be treated like
6795 `int foo(float x) {...}'. This is particularly
6796 useful for argument types like uid_t. */
6797 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6798 #ifdef PROMOTE_PROTOTYPES
6799 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6800 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6801 && TYPE_PRECISION (TREE_TYPE (parm))
6802 < TYPE_PRECISION (integer_type_node))
6803 DECL_ARG_TYPE (parm) = integer_type_node;
6807 pedwarn ("promoted argument `%s' doesn't match prototype",
6808 IDENTIFIER_POINTER (DECL_NAME (parm)));
6809 warning_with_file_and_line
6810 (current_function_prototype_file,
6811 current_function_prototype_line,
6812 "prototype declaration");
6815 /* If -traditional, allow `int' argument to match
6816 `unsigned' prototype. */
6817 else if (! (flag_traditional
6818 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6819 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6821 error ("argument `%s' doesn't match prototype",
6822 IDENTIFIER_POINTER (DECL_NAME (parm)));
6823 error_with_file_and_line (current_function_prototype_file,
6824 current_function_prototype_line,
6825 "prototype declaration");
6829 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6832 /* Otherwise, create a prototype that would match. */
6836 tree actual = 0, last = 0, type;
6838 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6840 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6843 TREE_CHAIN (last) = type;
6848 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6850 TREE_CHAIN (last) = type;
6854 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6855 of the type of this function, but we need to avoid having this
6856 affect the types of other similarly-typed functions, so we must
6857 first force the generation of an identical (but separate) type
6858 node for the relevant function type. The new node we create
6859 will be a variant of the main variant of the original function
6862 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6864 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6867 /* Now store the final chain of decls for the arguments
6868 as the decl-chain of the current lexical scope.
6869 Put the enumerators in as well, at the front so that
6870 DECL_ARGUMENTS is not modified. */
6872 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6875 /* Make sure the binding level for the top of the function body
6876 gets a BLOCK if there are any in the function.
6877 Otherwise, the dbx output is wrong. */
6879 keep_next_if_subblocks = 1;
6881 /* ??? This might be an improvement,
6882 but needs to be thought about some more. */
6884 keep_next_level_flag = 1;
6887 /* Write a record describing this function definition to the prototypes
6888 file (if requested). */
6890 gen_aux_info_record (fndecl, 1, 0, prototype);
6892 /* Initialize the RTL code for the function. */
6894 init_function_start (fndecl, input_filename, lineno);
6896 /* If this is a varargs function, inform function.c. */
6898 if (c_function_varargs)
6901 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6903 declare_function_name ();
6905 /* Set up parameters and prepare for return, for the function. */
6907 expand_function_start (fndecl, 0);
6909 /* If this function is `main', emit a call to `__main'
6910 to run global initializers, etc. */
6911 if (DECL_NAME (fndecl)
6912 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6913 && DECL_CONTEXT (fndecl) == NULL_TREE)
6914 expand_main_function ();
6917 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6918 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6919 stands for an ellipsis in the identifier list.
6921 PARMLIST is the data returned by get_parm_info for the
6922 parmlist that follows the semicolon.
6924 We return a value of the same sort that get_parm_info returns,
6925 except that it describes the combination of identifiers and parmlist. */
6928 combine_parm_decls (specparms, parmlist, void_at_end)
6929 tree specparms, parmlist;
6932 register tree fndecl = current_function_decl;
6935 tree parmdecls = TREE_PURPOSE (parmlist);
6937 /* This is a chain of any other decls that came in among the parm
6938 declarations. They were separated already by get_parm_info,
6939 so we just need to keep them separate. */
6940 tree nonparms = TREE_VALUE (parmlist);
6944 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6945 DECL_RESULT (parm) = 0;
6947 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6949 register tree tail, found = NULL;
6951 /* See if any of the parmdecls specifies this parm by name. */
6952 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6953 if (DECL_NAME (tail) == TREE_VALUE (parm))
6959 /* If declaration already marked, we have a duplicate name.
6960 Complain, and don't use this decl twice. */
6961 if (found && DECL_RESULT (found) != 0)
6963 error_with_decl (found, "multiple parameters named `%s'");
6967 /* If the declaration says "void", complain and ignore it. */
6968 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6970 error_with_decl (found, "parameter `%s' declared void");
6971 TREE_TYPE (found) = integer_type_node;
6972 DECL_ARG_TYPE (found) = integer_type_node;
6973 layout_decl (found, 0);
6976 /* Traditionally, a parm declared float is actually a double. */
6977 if (found && flag_traditional
6978 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6980 TREE_TYPE (found) = double_type_node;
6981 DECL_ARG_TYPE (found) = double_type_node;
6982 layout_decl (found, 0);
6985 /* If no declaration found, default to int. */
6988 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6990 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6991 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6992 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6993 error_with_decl (found, "type of parameter `%s' is not declared");
6997 TREE_PURPOSE (parm) = found;
6999 /* Mark this decl as "already found" -- see test, above.
7000 It is safe to use DECL_RESULT for this
7001 since it is not used in PARM_DECLs or CONST_DECLs. */
7002 DECL_RESULT (found) = error_mark_node;
7005 /* Complain about any actual PARM_DECLs not matched with any names. */
7007 for (parm = parmdecls; parm; )
7009 tree next = TREE_CHAIN (parm);
7010 TREE_CHAIN (parm) = 0;
7012 /* Complain about args with incomplete types. */
7013 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7015 error_with_decl (parm, "parameter `%s' has incomplete type");
7016 TREE_TYPE (parm) = error_mark_node;
7019 if (DECL_RESULT (parm) == 0)
7021 error_with_decl (parm,
7022 "declaration for parameter `%s' but no such parameter");
7023 /* Pretend the parameter was not missing.
7024 This gets us to a standard state and minimizes
7025 further error messages. */
7027 = chainon (specparms,
7028 tree_cons (parm, NULL_TREE, NULL_TREE));
7034 /* Chain the declarations together in the order of the list of names.
7035 At the same time, build up a list of their types, in reverse order. */
7041 for (last = 0; parm; parm = TREE_CHAIN (parm))
7042 if (TREE_PURPOSE (parm))
7045 parmdecls = TREE_PURPOSE (parm);
7047 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7048 last = TREE_PURPOSE (parm);
7049 TREE_CHAIN (last) = 0;
7051 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7056 return saveable_tree_cons (parmdecls, nonparms,
7057 nreverse (saveable_tree_cons (NULL_TREE,
7061 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7064 /* Finish up a function declaration and compile that function
7065 all the way to assembler language output. The free the storage
7066 for the function definition.
7068 This is called after parsing the body of the function definition.
7070 NESTED is nonzero if the function being finished is nested in another. */
7073 finish_function (nested)
7076 register tree fndecl = current_function_decl;
7078 /* TREE_READONLY (fndecl) = 1;
7079 This caused &foo to be of type ptr-to-const-function
7080 which then got a warning when stored in a ptr-to-function variable. */
7083 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7085 /* Must mark the RESULT_DECL as being in this function. */
7087 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7089 /* Obey `register' declarations if `setjmp' is called in this fn. */
7090 if (flag_traditional && current_function_calls_setjmp)
7092 setjmp_protect (DECL_INITIAL (fndecl));
7093 setjmp_protect_args ();
7096 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7098 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7099 != integer_type_node)
7101 /* You would expect the sense of this test to be the other way
7102 around, but if warn_main is set, we will already have warned,
7103 so this would be a duplicate. This is the warning you get
7104 in some environments even if you *don't* ask for it, because
7105 these are environments where it may be more of a problem than
7108 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7112 #ifdef DEFAULT_MAIN_RETURN
7113 /* Make it so that `main' always returns success by default. */
7114 DEFAULT_MAIN_RETURN;
7119 /* Generate rtl for function exit. */
7120 expand_function_end (input_filename, lineno, 0);
7122 /* So we can tell if jump_optimize sets it to 1. */
7125 /* Run the optimizers and output the assembler code for this function. */
7126 rest_of_compilation (fndecl);
7128 current_function_returns_null |= can_reach_end;
7130 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7131 warning ("`noreturn' function does return");
7132 else if (warn_return_type && can_reach_end
7133 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7134 /* If this function returns non-void and control can drop through,
7136 warning ("control reaches end of non-void function");
7137 /* With just -W, complain only if function returns both with
7138 and without a value. */
7139 else if (extra_warnings
7140 && current_function_returns_value && current_function_returns_null)
7141 warning ("this function may return with or without a value");
7143 /* If requested, warn about function definitions where the function will
7144 return a value (usually of some struct or union type) which itself will
7145 take up a lot of stack space. */
7147 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7149 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7153 register tree ret_type_size = TYPE_SIZE (ret_type);
7155 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7158 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7160 if (units > larger_than_size)
7161 warning_with_decl (fndecl,
7162 "size of return value of `%s' is %u bytes",
7168 /* Free all the tree nodes making up this function. */
7169 /* Switch back to allocating nodes permanently
7170 until we start another function. */
7172 permanent_allocation (1);
7174 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7176 /* Stop pointing to the local nodes about to be freed. */
7177 /* But DECL_INITIAL must remain nonzero so we know this
7178 was an actual function definition. */
7179 /* For a nested function, this is done in pop_c_function_context. */
7180 /* If rest_of_compilation set this to 0, leave it 0. */
7181 if (DECL_INITIAL (fndecl) != 0)
7182 DECL_INITIAL (fndecl) = error_mark_node;
7183 DECL_ARGUMENTS (fndecl) = 0;
7186 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7188 #ifndef ASM_OUTPUT_CONSTRUCTOR
7189 if (! flag_gnu_linker)
7190 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7193 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7195 if (DECL_STATIC_DESTRUCTOR (fndecl))
7197 #ifndef ASM_OUTPUT_DESTRUCTOR
7198 if (! flag_gnu_linker)
7199 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7202 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7207 /* Let the error reporting routines know that we're outside a
7208 function. For a nested function, this value is used in
7209 pop_c_function_context and then reset via pop_function_context. */
7210 current_function_decl = NULL;
7214 /* Save and restore the variables in this file and elsewhere
7215 that keep track of the progress of compilation of the current function.
7216 Used for nested functions. */
7220 struct c_function *next;
7222 tree shadowed_labels;
7225 int warn_about_return_type;
7227 struct binding_level *binding_level;
7230 struct c_function *c_function_chain;
7232 /* Save and reinitialize the variables
7233 used during compilation of a C function. */
7236 push_c_function_context ()
7238 struct c_function *p
7239 = (struct c_function *) xmalloc (sizeof (struct c_function));
7242 pedwarn ("ANSI C forbids nested functions");
7244 push_function_context ();
7246 p->next = c_function_chain;
7247 c_function_chain = p;
7249 p->named_labels = named_labels;
7250 p->shadowed_labels = shadowed_labels;
7251 p->returns_value = current_function_returns_value;
7252 p->returns_null = current_function_returns_null;
7253 p->warn_about_return_type = warn_about_return_type;
7254 p->extern_inline = current_extern_inline;
7255 p->binding_level = current_binding_level;
7258 /* Restore the variables used during compilation of a C function. */
7261 pop_c_function_context ()
7263 struct c_function *p = c_function_chain;
7266 /* Bring back all the labels that were shadowed. */
7267 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7268 if (DECL_NAME (TREE_VALUE (link)) != 0)
7269 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7270 = TREE_VALUE (link);
7272 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7274 /* Stop pointing to the local nodes about to be freed. */
7275 /* But DECL_INITIAL must remain nonzero so we know this
7276 was an actual function definition. */
7277 DECL_INITIAL (current_function_decl) = error_mark_node;
7278 DECL_ARGUMENTS (current_function_decl) = 0;
7281 pop_function_context ();
7283 c_function_chain = p->next;
7285 named_labels = p->named_labels;
7286 shadowed_labels = p->shadowed_labels;
7287 current_function_returns_value = p->returns_value;
7288 current_function_returns_null = p->returns_null;
7289 warn_about_return_type = p->warn_about_return_type;
7290 current_extern_inline = p->extern_inline;
7291 current_binding_level = p->binding_level;
7296 /* integrate_decl_tree calls this function, but since we don't use the
7297 DECL_LANG_SPECIFIC field, this is a no-op. */
7300 copy_lang_decl (node)
7301 tree node ATTRIBUTE_UNUSED;