1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
40 extern cpp_reader parse_in;
41 extern cpp_options parse_options;
42 static int cpp_initialized;
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
54 #ifndef CHAR_TYPE_SIZE
55 #define CHAR_TYPE_SIZE BITS_PER_UNIT
58 #ifndef SHORT_TYPE_SIZE
59 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
63 #define INT_TYPE_SIZE BITS_PER_WORD
66 #ifndef LONG_TYPE_SIZE
67 #define LONG_TYPE_SIZE BITS_PER_WORD
70 #ifndef LONG_LONG_TYPE_SIZE
71 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
74 #ifndef WCHAR_UNSIGNED
75 #define WCHAR_UNSIGNED 0
78 #ifndef FLOAT_TYPE_SIZE
79 #define FLOAT_TYPE_SIZE BITS_PER_WORD
82 #ifndef DOUBLE_TYPE_SIZE
83 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
86 #ifndef LONG_DOUBLE_TYPE_SIZE
87 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
90 /* We let tm.h override the types used here, to handle trivial differences
91 such as the choice of unsigned int or long unsigned int for size_t.
92 When machines start needing nontrivial differences in the size type,
93 it would be best to do something here to figure out automatically
94 from other information what type to use. */
97 #define SIZE_TYPE "long unsigned int"
101 #define PTRDIFF_TYPE "long int"
105 #define WCHAR_TYPE "int"
108 /* a node which has tree code ERROR_MARK, and whose type is itself.
109 All erroneous expressions are replaced with this node. All functions
110 that accept nodes as arguments should avoid generating error messages
111 if this node is one of the arguments, since it is undesirable to get
112 multiple error messages from one error in the input. */
114 tree error_mark_node;
116 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
118 tree short_integer_type_node;
119 tree integer_type_node;
120 tree long_integer_type_node;
121 tree long_long_integer_type_node;
123 tree short_unsigned_type_node;
124 tree unsigned_type_node;
125 tree long_unsigned_type_node;
126 tree long_long_unsigned_type_node;
128 tree boolean_type_node;
129 tree boolean_false_node;
130 tree boolean_true_node;
132 tree ptrdiff_type_node;
134 tree unsigned_char_type_node;
135 tree signed_char_type_node;
137 tree wchar_type_node;
138 tree signed_wchar_type_node;
139 tree unsigned_wchar_type_node;
141 tree float_type_node;
142 tree double_type_node;
143 tree long_double_type_node;
145 tree complex_integer_type_node;
146 tree complex_float_type_node;
147 tree complex_double_type_node;
148 tree complex_long_double_type_node;
150 tree intQI_type_node;
151 tree intHI_type_node;
152 tree intSI_type_node;
153 tree intDI_type_node;
154 tree intTI_type_node;
156 tree unsigned_intQI_type_node;
157 tree unsigned_intHI_type_node;
158 tree unsigned_intSI_type_node;
159 tree unsigned_intDI_type_node;
160 tree unsigned_intTI_type_node;
162 /* a VOID_TYPE node. */
166 /* Nodes for types `void *' and `const void *'. */
168 tree ptr_type_node, const_ptr_type_node;
170 /* Nodes for types `char *' and `const char *'. */
172 tree string_type_node, const_string_type_node;
174 /* Type `char[SOMENUMBER]'.
175 Used when an array of char is needed and the size is irrelevant. */
177 tree char_array_type_node;
179 /* Type `int[SOMENUMBER]' or something like it.
180 Used when an array of int needed and the size is irrelevant. */
182 tree int_array_type_node;
184 /* Type `wchar_t[SOMENUMBER]' or something like it.
185 Used when a wide string literal is created. */
187 tree wchar_array_type_node;
189 /* type `int ()' -- used for implicit declaration of functions. */
191 tree default_function_type;
193 /* function types `double (double)' and `double (double, double)', etc. */
195 tree double_ftype_double, double_ftype_double_double;
196 tree int_ftype_int, long_ftype_long;
197 tree float_ftype_float;
198 tree ldouble_ftype_ldouble;
200 /* Function type `void (void *, void *, int)' and similar ones */
202 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
204 /* Function type `char *(char *, char *)' and similar ones */
205 tree string_ftype_ptr_ptr, int_ftype_string_string;
207 /* Function type `int (const void *, const void *, size_t)' */
208 tree int_ftype_cptr_cptr_sizet;
210 /* Two expressions that are constants with value zero.
211 The first is of type `int', the second of type `void *'. */
213 tree integer_zero_node;
214 tree null_pointer_node;
216 /* A node for the integer constant 1. */
218 tree integer_one_node;
220 /* Nonzero if we have seen an invalid cross reference
221 to a struct, union, or enum, but not yet printed the message. */
223 tree pending_invalid_xref;
224 /* File and line to appear in the eventual error message. */
225 char *pending_invalid_xref_file;
226 int pending_invalid_xref_line;
228 /* While defining an enum type, this is 1 plus the last enumerator
229 constant value. Note that will do not have to save this or `enum_overflow'
230 around nested function definition since such a definition could only
231 occur in an enum value expression and we don't use these variables in
234 static tree enum_next_value;
236 /* Nonzero means that there was overflow computing enum_next_value. */
238 static int enum_overflow;
240 /* Parsing a function declarator leaves a list of parameter names
241 or a chain or parameter decls here. */
243 static tree last_function_parms;
245 /* Parsing a function declarator leaves here a chain of structure
246 and enum types declared in the parmlist. */
248 static tree last_function_parm_tags;
250 /* After parsing the declarator that starts a function definition,
251 `start_function' puts here the list of parameter names or chain of decls.
252 `store_parm_decls' finds it here. */
254 static tree current_function_parms;
256 /* Similar, for last_function_parm_tags. */
257 static tree current_function_parm_tags;
259 /* Similar, for the file and line that the prototype came from if this is
260 an old-style definition. */
261 static char *current_function_prototype_file;
262 static int current_function_prototype_line;
264 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
265 that have names. Here so we can clear out their names' definitions
266 at the end of the function. */
268 static tree named_labels;
270 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
272 static tree shadowed_labels;
274 /* Nonzero when store_parm_decls is called indicates a varargs function.
275 Value not meaningful after store_parm_decls. */
277 static int c_function_varargs;
279 /* The FUNCTION_DECL for the function currently being compiled,
280 or 0 if between functions. */
281 tree current_function_decl;
283 /* Set to 0 at beginning of a function definition, set to 1 if
284 a return statement that specifies a return value is seen. */
286 int current_function_returns_value;
288 /* Set to 0 at beginning of a function definition, set to 1 if
289 a return statement with no argument is seen. */
291 int current_function_returns_null;
293 /* Set to nonzero by `grokdeclarator' for a function
294 whose return type is defaulted, if warnings for this are desired. */
296 static int warn_about_return_type;
298 /* Nonzero when starting a function declared `extern inline'. */
300 static int current_extern_inline;
302 /* For each binding contour we allocate a binding_level structure
303 * which records the names defined in that contour.
306 * 1) one for each function definition,
307 * where internal declarations of the parameters appear.
308 * 2) one for each compound statement,
309 * to record its declarations.
311 * The current meaning of a name can be found by searching the levels from
312 * the current one out to the global one.
315 /* Note that the information in the `names' component of the global contour
316 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
320 /* A chain of _DECL nodes for all variables, constants, functions,
321 and typedef types. These are in the reverse of the order supplied.
325 /* A list of structure, union and enum definitions,
326 * for looking up tag names.
327 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
328 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
329 * or ENUMERAL_TYPE node.
333 /* For each level, a list of shadowed outer-level local definitions
334 to be restored when this level is popped.
335 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
336 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
339 /* For each level (except not the global one),
340 a chain of BLOCK nodes for all the levels
341 that were entered and exited one level down. */
344 /* The BLOCK node for this level, if one has been preallocated.
345 If 0, the BLOCK is allocated (if needed) when the level is popped. */
348 /* The binding level which this one is contained in (inherits from). */
349 struct binding_level *level_chain;
351 /* Nonzero for the level that holds the parameters of a function. */
354 /* Nonzero if this level "doesn't exist" for tags. */
355 char tag_transparent;
357 /* Nonzero if sublevels of this level "don't exist" for tags.
358 This is set in the parm level of a function definition
359 while reading the function body, so that the outermost block
360 of the function body will be tag-transparent. */
361 char subblocks_tag_transparent;
363 /* Nonzero means make a BLOCK for this level regardless of all else. */
366 /* Nonzero means make a BLOCK if this level has any subblocks. */
367 char keep_if_subblocks;
369 /* Number of decls in `names' that have incomplete
370 structure or union types. */
373 /* A list of decls giving the (reversed) specified order of parms,
374 not including any forward-decls in the parmlist.
375 This is so we can put the parms in proper order for assign_parms. */
379 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
381 /* The binding level currently in effect. */
383 static struct binding_level *current_binding_level;
385 /* A chain of binding_level structures awaiting reuse. */
387 static struct binding_level *free_binding_level;
389 /* The outermost binding level, for names of file scope.
390 This is created when the compiler is started and exists
391 through the entire run. */
393 static struct binding_level *global_binding_level;
395 /* Binding level structures are initialized by copying this one. */
397 static struct binding_level clear_binding_level
398 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
401 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
403 static int keep_next_level_flag;
405 /* Nonzero means make a BLOCK for the next level pushed
406 if it has subblocks. */
408 static int keep_next_if_subblocks;
410 /* The chain of outer levels of label scopes.
411 This uses the same data structure used for binding levels,
412 but it works differently: each link in the chain records
413 saved values of named_labels and shadowed_labels for
414 a label binding level outside the current one. */
416 static struct binding_level *label_level_chain;
418 /* Functions called automatically at the beginning and end of execution. */
420 tree static_ctors, static_dtors;
422 /* Forward declarations. */
424 static struct binding_level * make_binding_level PROTO((void));
425 static void clear_limbo_values PROTO((tree));
426 static int duplicate_decls PROTO((tree, tree, int));
427 static char *redeclaration_error_message PROTO((tree, tree));
428 static void storedecls PROTO((tree));
429 static void storetags PROTO((tree));
430 static tree lookup_tag PROTO((enum tree_code, tree,
431 struct binding_level *, int));
432 static tree lookup_tag_reverse PROTO((tree));
433 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
435 static tree grokparms PROTO((tree, int));
436 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
437 static void layout_array_type PROTO((tree));
439 /* C-specific option variables. */
441 /* Nonzero means allow type mismatches in conditional expressions;
442 just make their values `void'. */
444 int flag_cond_mismatch;
446 /* Nonzero means give `double' the same size as `float'. */
448 int flag_short_double;
450 /* Nonzero means don't recognize the keyword `asm'. */
454 /* Nonzero means don't recognize any builtin functions. */
458 /* Nonzero means don't recognize the non-ANSI builtin functions.
461 int flag_no_nonansi_builtin;
463 /* Nonzero means do some things the same way PCC does. */
465 int flag_traditional;
467 /* Nonzero means that we have builtin functions, and main is an int */
471 /* Nonzero means to allow single precision math even if we're generally
472 being traditional. */
473 int flag_allow_single_precision = 0;
475 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
477 int flag_signed_bitfields = 1;
478 int explicit_flag_signed_bitfields = 0;
480 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
482 int flag_no_ident = 0;
484 /* Nonzero means warn about use of implicit int. */
486 int warn_implicit_int;
488 /* Nonzero means warn about usage of long long when `-pedantic'. */
490 int warn_long_long = 1;
492 /* Nonzero means message about use of implicit function declarations;
493 1 means warning; 2 means error. */
495 int mesg_implicit_function_declaration;
497 /* Nonzero means give string constants the type `const char *'
498 to get extra warnings from them. These warnings will be too numerous
499 to be useful, except in thoroughly ANSIfied programs. */
501 int flag_const_strings;
503 /* Nonzero means warn about pointer casts that can drop a type qualifier
504 from the pointer target type. */
508 /* Nonzero means warn when casting a function call to a type that does
509 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
510 when there is no previous declaration of sqrt or malloc. */
512 int warn_bad_function_cast;
514 /* Warn about traditional constructs whose meanings changed in ANSI C. */
516 int warn_traditional;
518 /* Nonzero means warn about sizeof(function) or addition/subtraction
519 of function pointers. */
521 int warn_pointer_arith;
523 /* Nonzero means warn for non-prototype function decls
524 or non-prototyped defs without previous prototype. */
526 int warn_strict_prototypes;
528 /* Nonzero means warn for any global function def
529 without separate previous prototype decl. */
531 int warn_missing_prototypes;
533 /* Nonzero means warn for any global function def
534 without separate previous decl. */
536 int warn_missing_declarations;
538 /* Nonzero means warn about multiple (redundant) decls for the same single
539 variable or function. */
541 int warn_redundant_decls = 0;
543 /* Nonzero means warn about extern declarations of objects not at
544 file-scope level and about *all* declarations of functions (whether
545 extern or static) not at file-scope level. Note that we exclude
546 implicit function declarations. To get warnings about those, use
549 int warn_nested_externs = 0;
551 /* Warn about *printf or *scanf format/argument anomalies. */
555 /* Warn about a subscript that has type char. */
557 int warn_char_subscripts = 0;
559 /* Warn if a type conversion is done that might have confusing results. */
563 /* Warn if adding () is suggested. */
565 int warn_parentheses;
567 /* Warn if initializer is not completely bracketed. */
569 int warn_missing_braces;
571 /* Warn if main is suspicious. */
575 /* Warn about #pragma directives that are not recognised. */
577 int warn_unknown_pragmas = 0; /* Tri state variable. */
579 /* Warn about comparison of signed and unsigned values.
580 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
582 int warn_sign_compare = -1;
584 /* Nonzero means warn about use of multicharacter literals. */
586 int warn_multichar = 1;
588 /* Nonzero means `$' can be in an identifier. */
590 #ifndef DOLLARS_IN_IDENTIFIERS
591 #define DOLLARS_IN_IDENTIFIERS 1
593 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
595 /* Decode the string P as a language-specific option for C.
596 Return the number of strings consumed. */
599 c_decode_option (argc, argv)
603 int strings_processed;
606 if (! cpp_initialized)
608 cpp_reader_init (&parse_in);
609 parse_in.data = &parse_options;
610 cpp_options_init (&parse_options);
613 strings_processed = cpp_handle_option (&parse_in, argc, argv);
615 strings_processed = 0;
616 #endif /* ! USE_CPPLIB */
618 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
620 flag_traditional = 1;
621 flag_writable_strings = 1;
623 else if (!strcmp (p, "-fallow-single-precision"))
624 flag_allow_single_precision = 1;
625 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
630 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
634 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
638 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
640 flag_traditional = 0;
641 flag_writable_strings = 0;
643 else if (!strcmp (p, "-fdollars-in-identifiers"))
644 dollars_in_ident = 1;
645 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
646 dollars_in_ident = 0;
647 else if (!strcmp (p, "-fsigned-char"))
648 flag_signed_char = 1;
649 else if (!strcmp (p, "-funsigned-char"))
650 flag_signed_char = 0;
651 else if (!strcmp (p, "-fno-signed-char"))
652 flag_signed_char = 0;
653 else if (!strcmp (p, "-fno-unsigned-char"))
654 flag_signed_char = 1;
655 else if (!strcmp (p, "-fsigned-bitfields")
656 || !strcmp (p, "-fno-unsigned-bitfields"))
658 flag_signed_bitfields = 1;
659 explicit_flag_signed_bitfields = 1;
661 else if (!strcmp (p, "-funsigned-bitfields")
662 || !strcmp (p, "-fno-signed-bitfields"))
664 flag_signed_bitfields = 0;
665 explicit_flag_signed_bitfields = 1;
667 else if (!strcmp (p, "-fshort-enums"))
668 flag_short_enums = 1;
669 else if (!strcmp (p, "-fno-short-enums"))
670 flag_short_enums = 0;
671 else if (!strcmp (p, "-fcond-mismatch"))
672 flag_cond_mismatch = 1;
673 else if (!strcmp (p, "-fno-cond-mismatch"))
674 flag_cond_mismatch = 0;
675 else if (!strcmp (p, "-fshort-double"))
676 flag_short_double = 1;
677 else if (!strcmp (p, "-fno-short-double"))
678 flag_short_double = 0;
679 else if (!strcmp (p, "-fasm"))
681 else if (!strcmp (p, "-fno-asm"))
683 else if (!strcmp (p, "-fbuiltin"))
685 else if (!strcmp (p, "-fno-builtin"))
687 else if (!strcmp (p, "-fno-ident"))
689 else if (!strcmp (p, "-fident"))
691 else if (!strcmp (p, "-ansi"))
692 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
693 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
694 mesg_implicit_function_declaration = 2;
695 else if (!strcmp (p, "-Wimplicit-function-declaration"))
696 mesg_implicit_function_declaration = 1;
697 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
698 mesg_implicit_function_declaration = 0;
699 else if (!strcmp (p, "-Wimplicit-int"))
700 warn_implicit_int = 1;
701 else if (!strcmp (p, "-Wno-implicit-int"))
702 warn_implicit_int = 0;
703 else if (!strcmp (p, "-Wimplicit"))
705 warn_implicit_int = 1;
706 if (mesg_implicit_function_declaration != 2)
707 mesg_implicit_function_declaration = 1;
709 else if (!strcmp (p, "-Wno-implicit"))
710 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
711 else if (!strcmp (p, "-Wlong-long"))
713 else if (!strcmp (p, "-Wno-long-long"))
715 else if (!strcmp (p, "-Wwrite-strings"))
716 flag_const_strings = 1;
717 else if (!strcmp (p, "-Wno-write-strings"))
718 flag_const_strings = 0;
719 else if (!strcmp (p, "-Wcast-qual"))
721 else if (!strcmp (p, "-Wno-cast-qual"))
723 else if (!strcmp (p, "-Wbad-function-cast"))
724 warn_bad_function_cast = 1;
725 else if (!strcmp (p, "-Wno-bad-function-cast"))
726 warn_bad_function_cast = 0;
727 else if (!strcmp (p, "-Wpointer-arith"))
728 warn_pointer_arith = 1;
729 else if (!strcmp (p, "-Wno-pointer-arith"))
730 warn_pointer_arith = 0;
731 else if (!strcmp (p, "-Wstrict-prototypes"))
732 warn_strict_prototypes = 1;
733 else if (!strcmp (p, "-Wno-strict-prototypes"))
734 warn_strict_prototypes = 0;
735 else if (!strcmp (p, "-Wmissing-prototypes"))
736 warn_missing_prototypes = 1;
737 else if (!strcmp (p, "-Wno-missing-prototypes"))
738 warn_missing_prototypes = 0;
739 else if (!strcmp (p, "-Wmissing-declarations"))
740 warn_missing_declarations = 1;
741 else if (!strcmp (p, "-Wno-missing-declarations"))
742 warn_missing_declarations = 0;
743 else if (!strcmp (p, "-Wredundant-decls"))
744 warn_redundant_decls = 1;
745 else if (!strcmp (p, "-Wno-redundant-decls"))
746 warn_redundant_decls = 0;
747 else if (!strcmp (p, "-Wnested-externs"))
748 warn_nested_externs = 1;
749 else if (!strcmp (p, "-Wno-nested-externs"))
750 warn_nested_externs = 0;
751 else if (!strcmp (p, "-Wtraditional"))
752 warn_traditional = 1;
753 else if (!strcmp (p, "-Wno-traditional"))
754 warn_traditional = 0;
755 else if (!strcmp (p, "-Wformat"))
757 else if (!strcmp (p, "-Wno-format"))
759 else if (!strcmp (p, "-Wchar-subscripts"))
760 warn_char_subscripts = 1;
761 else if (!strcmp (p, "-Wno-char-subscripts"))
762 warn_char_subscripts = 0;
763 else if (!strcmp (p, "-Wconversion"))
765 else if (!strcmp (p, "-Wno-conversion"))
767 else if (!strcmp (p, "-Wparentheses"))
768 warn_parentheses = 1;
769 else if (!strcmp (p, "-Wno-parentheses"))
770 warn_parentheses = 0;
771 else if (!strcmp (p, "-Wreturn-type"))
772 warn_return_type = 1;
773 else if (!strcmp (p, "-Wno-return-type"))
774 warn_return_type = 0;
775 else if (!strcmp (p, "-Wcomment"))
776 ; /* cpp handles this one. */
777 else if (!strcmp (p, "-Wno-comment"))
778 ; /* cpp handles this one. */
779 else if (!strcmp (p, "-Wcomments"))
780 ; /* cpp handles this one. */
781 else if (!strcmp (p, "-Wno-comments"))
782 ; /* cpp handles this one. */
783 else if (!strcmp (p, "-Wtrigraphs"))
784 ; /* cpp handles this one. */
785 else if (!strcmp (p, "-Wno-trigraphs"))
786 ; /* cpp handles this one. */
787 else if (!strcmp (p, "-Wundef"))
788 ; /* cpp handles this one. */
789 else if (!strcmp (p, "-Wno-undef"))
790 ; /* cpp handles this one. */
791 else if (!strcmp (p, "-Wimport"))
792 ; /* cpp handles this one. */
793 else if (!strcmp (p, "-Wno-import"))
794 ; /* cpp handles this one. */
795 else if (!strcmp (p, "-Wmissing-braces"))
796 warn_missing_braces = 1;
797 else if (!strcmp (p, "-Wno-missing-braces"))
798 warn_missing_braces = 0;
799 else if (!strcmp (p, "-Wmain"))
801 else if (!strcmp (p, "-Wno-main"))
803 else if (!strcmp (p, "-Wsign-compare"))
804 warn_sign_compare = 1;
805 else if (!strcmp (p, "-Wno-sign-compare"))
806 warn_sign_compare = 0;
807 else if (!strcmp (p, "-Wmultichar"))
809 else if (!strcmp (p, "-Wno-multichar"))
811 else if (!strcmp (p, "-Wunknown-pragmas"))
812 /* Set to greater than 1, so that even unknown pragmas in system
813 headers will be warned about. */
814 warn_unknown_pragmas = 2;
815 else if (!strcmp (p, "-Wno-unknown-pragmas"))
816 warn_unknown_pragmas = 0;
817 else if (!strcmp (p, "-Wall"))
819 /* We save the value of warn_uninitialized, since if they put
820 -Wuninitialized on the command line, we need to generate a
821 warning about not using it without also specifying -O. */
822 if (warn_uninitialized != 1)
823 warn_uninitialized = 2;
824 warn_implicit_int = 1;
825 mesg_implicit_function_declaration = 1;
826 warn_return_type = 1;
830 warn_char_subscripts = 1;
831 warn_parentheses = 1;
832 warn_missing_braces = 1;
833 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
834 it off only if it's not explicit. */
836 /* Only warn about unknown pragmas that are not in system headers. */
837 warn_unknown_pragmas = 1;
840 return strings_processed;
845 /* Hooks for print_node. */
848 print_lang_decl (file, node, indent)
849 FILE *file ATTRIBUTE_UNUSED;
850 tree node ATTRIBUTE_UNUSED;
851 int indent ATTRIBUTE_UNUSED;
856 print_lang_type (file, node, indent)
857 FILE *file ATTRIBUTE_UNUSED;
858 tree node ATTRIBUTE_UNUSED;
859 int indent ATTRIBUTE_UNUSED;
864 print_lang_identifier (file, node, indent)
869 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
870 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
871 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
872 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
873 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
874 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
877 /* Hook called at end of compilation to assume 1 elt
878 for a top-level array decl that wasn't complete before. */
881 finish_incomplete_decl (decl)
884 if (TREE_CODE (decl) == VAR_DECL)
886 tree type = TREE_TYPE (decl);
887 if (type != error_mark_node
888 && TREE_CODE (type) == ARRAY_TYPE
889 && TYPE_DOMAIN (type) == 0)
891 if (! DECL_EXTERNAL (decl))
892 warning_with_decl (decl, "array `%s' assumed to have one element");
894 complete_array_type (type, NULL_TREE, 1);
896 layout_decl (decl, 0);
901 /* Create a new `struct binding_level'. */
904 struct binding_level *
905 make_binding_level ()
908 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
911 /* Nonzero if we are currently in the global binding level. */
916 return current_binding_level == global_binding_level;
922 keep_next_level_flag = 1;
925 /* Nonzero if the current level needs to have a BLOCK made. */
930 return ((current_binding_level->keep_if_subblocks
931 && current_binding_level->blocks != 0)
932 || current_binding_level->keep
933 || current_binding_level->names != 0
934 || (current_binding_level->tags != 0
935 && !current_binding_level->tag_transparent));
938 /* Identify this binding level as a level of parameters.
939 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
940 But it turns out there is no way to pass the right value for
941 DEFINITION_FLAG, so we ignore it. */
944 declare_parm_level (definition_flag)
947 current_binding_level->parm_flag = 1;
950 /* Nonzero if currently making parm declarations. */
955 return current_binding_level->parm_flag;
958 /* Enter a new binding level.
959 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
960 not for that of tags. */
963 pushlevel (tag_transparent)
966 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
968 /* If this is the top level of a function,
969 just make sure that NAMED_LABELS is 0. */
971 if (current_binding_level == global_binding_level)
976 /* Reuse or create a struct for this binding level. */
978 if (free_binding_level)
980 newlevel = free_binding_level;
981 free_binding_level = free_binding_level->level_chain;
985 newlevel = make_binding_level ();
988 /* Add this level to the front of the chain (stack) of levels that
991 *newlevel = clear_binding_level;
992 newlevel->tag_transparent
994 || (current_binding_level
995 ? current_binding_level->subblocks_tag_transparent
997 newlevel->level_chain = current_binding_level;
998 current_binding_level = newlevel;
999 newlevel->keep = keep_next_level_flag;
1000 keep_next_level_flag = 0;
1001 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1002 keep_next_if_subblocks = 0;
1005 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1008 clear_limbo_values (block)
1013 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1014 if (DECL_NAME (tem) != 0)
1015 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1017 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1018 clear_limbo_values (tem);
1021 /* Exit a binding level.
1022 Pop the level off, and restore the state of the identifier-decl mappings
1023 that were in effect when this level was entered.
1025 If KEEP is nonzero, this level had explicit declarations, so
1026 and create a "block" (a BLOCK node) for the level
1027 to record its declarations and subblocks for symbol table output.
1029 If FUNCTIONBODY is nonzero, this level is the body of a function,
1030 so create a block as if KEEP were set and also clear out all
1033 If REVERSE is nonzero, reverse the order of decls before putting
1034 them into the BLOCK. */
1037 poplevel (keep, reverse, functionbody)
1043 /* The chain of decls was accumulated in reverse order.
1044 Put it into forward order, just for cleanliness. */
1046 tree tags = current_binding_level->tags;
1047 tree subblocks = current_binding_level->blocks;
1050 int block_previously_created;
1052 keep |= current_binding_level->keep;
1054 /* This warning is turned off because it causes warnings for
1055 declarations like `extern struct foo *x'. */
1057 /* Warn about incomplete structure types in this level. */
1058 for (link = tags; link; link = TREE_CHAIN (link))
1059 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1061 tree type = TREE_VALUE (link);
1063 switch (TREE_CODE (type))
1066 errmsg = "`struct %s' incomplete in scope ending here";
1069 errmsg = "`union %s' incomplete in scope ending here";
1072 errmsg = "`enum %s' incomplete in scope ending here";
1075 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1076 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1078 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1079 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1083 /* Get the decls in the order they were written.
1084 Usually current_binding_level->names is in reverse order.
1085 But parameter decls were previously put in forward order. */
1088 current_binding_level->names
1089 = decls = nreverse (current_binding_level->names);
1091 decls = current_binding_level->names;
1093 /* Output any nested inline functions within this block
1094 if they weren't already output. */
1096 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1097 if (TREE_CODE (decl) == FUNCTION_DECL
1098 && ! TREE_ASM_WRITTEN (decl)
1099 && DECL_INITIAL (decl) != 0
1100 && TREE_ADDRESSABLE (decl))
1102 /* If this decl was copied from a file-scope decl
1103 on account of a block-scope extern decl,
1104 propagate TREE_ADDRESSABLE to the file-scope decl.
1106 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1107 true, since then the decl goes through save_for_inline_copying. */
1108 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1109 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1110 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1111 else if (DECL_SAVED_INSNS (decl) != 0)
1113 push_function_context ();
1114 output_inline_function (decl);
1115 pop_function_context ();
1119 /* If there were any declarations or structure tags in that level,
1120 or if this level is a function body,
1121 create a BLOCK to record them for the life of this function. */
1124 block_previously_created = (current_binding_level->this_block != 0);
1125 if (block_previously_created)
1126 block = current_binding_level->this_block;
1127 else if (keep || functionbody
1128 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1129 block = make_node (BLOCK);
1132 BLOCK_VARS (block) = decls;
1133 BLOCK_TYPE_TAGS (block) = tags;
1134 BLOCK_SUBBLOCKS (block) = subblocks;
1135 remember_end_note (block);
1138 /* In each subblock, record that this is its superior. */
1140 for (link = subblocks; link; link = TREE_CHAIN (link))
1141 BLOCK_SUPERCONTEXT (link) = block;
1143 /* Clear out the meanings of the local variables of this level. */
1145 for (link = decls; link; link = TREE_CHAIN (link))
1147 if (DECL_NAME (link) != 0)
1149 /* If the ident. was used or addressed via a local extern decl,
1150 don't forget that fact. */
1151 if (DECL_EXTERNAL (link))
1153 if (TREE_USED (link))
1154 TREE_USED (DECL_NAME (link)) = 1;
1155 if (TREE_ADDRESSABLE (link))
1156 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1158 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1162 /* Restore all name-meanings of the outer levels
1163 that were shadowed by this level. */
1165 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1166 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1168 /* If the level being exited is the top level of a function,
1169 check over all the labels, and clear out the current
1170 (function local) meanings of their names. */
1174 clear_limbo_values (block);
1176 /* If this is the top level block of a function,
1177 the vars are the function's parameters.
1178 Don't leave them in the BLOCK because they are
1179 found in the FUNCTION_DECL instead. */
1181 BLOCK_VARS (block) = 0;
1183 /* Clear out the definitions of all label names,
1184 since their scopes end here,
1185 and add them to BLOCK_VARS. */
1187 for (link = named_labels; link; link = TREE_CHAIN (link))
1189 register tree label = TREE_VALUE (link);
1191 if (DECL_INITIAL (label) == 0)
1193 error_with_decl (label, "label `%s' used but not defined");
1194 /* Avoid crashing later. */
1195 define_label (input_filename, lineno,
1198 else if (warn_unused && !TREE_USED (label))
1199 warning_with_decl (label, "label `%s' defined but not used");
1200 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1202 /* Put the labels into the "variables" of the
1203 top-level block, so debugger can see them. */
1204 TREE_CHAIN (label) = BLOCK_VARS (block);
1205 BLOCK_VARS (block) = label;
1209 /* Pop the current level, and free the structure for reuse. */
1212 register struct binding_level *level = current_binding_level;
1213 current_binding_level = current_binding_level->level_chain;
1215 level->level_chain = free_binding_level;
1216 free_binding_level = level;
1219 /* Dispose of the block that we just made inside some higher level. */
1221 DECL_INITIAL (current_function_decl) = block;
1224 if (!block_previously_created)
1225 current_binding_level->blocks
1226 = chainon (current_binding_level->blocks, block);
1228 /* If we did not make a block for the level just exited,
1229 any blocks made for inner levels
1230 (since they cannot be recorded as subblocks in that level)
1231 must be carried forward so they will later become subblocks
1232 of something else. */
1234 current_binding_level->blocks
1235 = chainon (current_binding_level->blocks, subblocks);
1237 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1238 binding contour so that they point to the appropriate construct, i.e.
1239 either to the current FUNCTION_DECL node, or else to the BLOCK node
1240 we just constructed.
1242 Note that for tagged types whose scope is just the formal parameter
1243 list for some function type specification, we can't properly set
1244 their TYPE_CONTEXTs here, because we don't have a pointer to the
1245 appropriate FUNCTION_TYPE node readily available to us. For those
1246 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1247 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1248 node which will represent the "scope" for these "parameter list local"
1253 for (link = tags; link; link = TREE_CHAIN (link))
1254 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1256 for (link = tags; link; link = TREE_CHAIN (link))
1257 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1260 TREE_USED (block) = 1;
1264 /* Delete the node BLOCK from the current binding level.
1265 This is used for the block inside a stmt expr ({...})
1266 so that the block can be reinserted where appropriate. */
1269 delete_block (block)
1273 if (current_binding_level->blocks == block)
1274 current_binding_level->blocks = TREE_CHAIN (block);
1275 for (t = current_binding_level->blocks; t;)
1277 if (TREE_CHAIN (t) == block)
1278 TREE_CHAIN (t) = TREE_CHAIN (block);
1282 TREE_CHAIN (block) = NULL;
1283 /* Clear TREE_USED which is always set by poplevel.
1284 The flag is set again if insert_block is called. */
1285 TREE_USED (block) = 0;
1288 /* Insert BLOCK at the end of the list of subblocks of the
1289 current binding level. This is used when a BIND_EXPR is expanded,
1290 to handle the BLOCK node inside the BIND_EXPR. */
1293 insert_block (block)
1296 TREE_USED (block) = 1;
1297 current_binding_level->blocks
1298 = chainon (current_binding_level->blocks, block);
1301 /* Set the BLOCK node for the innermost scope
1302 (the one we are currently in). */
1306 register tree block;
1308 current_binding_level->this_block = block;
1314 register struct binding_level *newlevel;
1316 /* Reuse or create a struct for this binding level. */
1318 if (free_binding_level)
1320 newlevel = free_binding_level;
1321 free_binding_level = free_binding_level->level_chain;
1325 newlevel = make_binding_level ();
1328 /* Add this level to the front of the chain (stack) of label levels. */
1330 newlevel->level_chain = label_level_chain;
1331 label_level_chain = newlevel;
1333 newlevel->names = named_labels;
1334 newlevel->shadowed = shadowed_labels;
1336 shadowed_labels = 0;
1342 register struct binding_level *level = label_level_chain;
1345 /* Clear out the definitions of the declared labels in this level.
1346 Leave in the list any ordinary, non-declared labels. */
1347 for (link = named_labels, prev = 0; link;)
1349 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1351 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1353 error_with_decl (TREE_VALUE (link),
1354 "label `%s' used but not defined");
1355 /* Avoid crashing later. */
1356 define_label (input_filename, lineno,
1357 DECL_NAME (TREE_VALUE (link)));
1359 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1360 warning_with_decl (TREE_VALUE (link),
1361 "label `%s' defined but not used");
1362 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1364 /* Delete this element from the list. */
1365 link = TREE_CHAIN (link);
1367 TREE_CHAIN (prev) = link;
1369 named_labels = link;
1374 link = TREE_CHAIN (link);
1378 /* Bring back all the labels that were shadowed. */
1379 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1380 if (DECL_NAME (TREE_VALUE (link)) != 0)
1381 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1382 = TREE_VALUE (link);
1384 named_labels = chainon (named_labels, level->names);
1385 shadowed_labels = level->shadowed;
1387 /* Pop the current level, and free the structure for reuse. */
1388 label_level_chain = label_level_chain->level_chain;
1389 level->level_chain = free_binding_level;
1390 free_binding_level = level;
1393 /* Push a definition or a declaration of struct, union or enum tag "name".
1394 "type" should be the type node.
1395 We assume that the tag "name" is not already defined.
1397 Note that the definition may really be just a forward reference.
1398 In that case, the TYPE_SIZE will be zero. */
1401 pushtag (name, type)
1404 register struct binding_level *b;
1406 /* Find the proper binding level for this type tag. */
1408 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1413 /* Record the identifier as the type's name if it has none. */
1415 if (TYPE_NAME (type) == 0)
1416 TYPE_NAME (type) = name;
1419 if (b == global_binding_level)
1420 b->tags = perm_tree_cons (name, type, b->tags);
1422 b->tags = saveable_tree_cons (name, type, b->tags);
1424 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1425 tagged type we just added to the current binding level. This fake
1426 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1427 to output a representation of a tagged type, and it also gives
1428 us a convenient place to record the "scope start" address for the
1431 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1433 /* An approximation for now, so we can tell this is a function-scope tag.
1434 This will be updated in poplevel. */
1435 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1438 /* Handle when a new declaration NEWDECL
1439 has the same name as an old one OLDDECL
1440 in the same binding contour.
1441 Prints an error message if appropriate.
1443 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1444 Otherwise, return 0.
1446 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1447 and OLDDECL is in an outer binding level and should thus not be changed. */
1450 duplicate_decls (newdecl, olddecl, different_binding_level)
1451 register tree newdecl, olddecl;
1452 int different_binding_level;
1454 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1455 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1456 && DECL_INITIAL (newdecl) != 0);
1457 tree oldtype = TREE_TYPE (olddecl);
1458 tree newtype = TREE_TYPE (newdecl);
1461 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1462 DECL_MACHINE_ATTRIBUTES (newdecl)
1463 = merge_machine_decl_attributes (olddecl, newdecl);
1465 if (TREE_CODE (newtype) == ERROR_MARK
1466 || TREE_CODE (oldtype) == ERROR_MARK)
1469 /* New decl is completely inconsistent with the old one =>
1470 tell caller to replace the old one.
1471 This is always an error except in the case of shadowing a builtin. */
1472 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1474 if (TREE_CODE (olddecl) == FUNCTION_DECL
1475 && (DECL_BUILT_IN (olddecl)
1476 || DECL_BUILT_IN_NONANSI (olddecl)))
1478 /* If you declare a built-in or predefined function name as static,
1479 the old definition is overridden,
1480 but optionally warn this was a bad choice of name. */
1481 if (!TREE_PUBLIC (newdecl))
1485 else if (DECL_BUILT_IN (olddecl))
1486 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1488 warning_with_decl (newdecl, "shadowing library function `%s'");
1490 /* Likewise, if the built-in is not ansi, then programs can
1491 override it even globally without an error. */
1492 else if (! DECL_BUILT_IN (olddecl))
1493 warning_with_decl (newdecl,
1494 "library function `%s' declared as non-function");
1496 else if (DECL_BUILT_IN_NONANSI (olddecl))
1497 warning_with_decl (newdecl,
1498 "built-in function `%s' declared as non-function");
1500 warning_with_decl (newdecl,
1501 "built-in function `%s' declared as non-function");
1505 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1506 error_with_decl (olddecl, "previous declaration of `%s'");
1512 /* For real parm decl following a forward decl,
1513 return 1 so old decl will be reused. */
1514 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1515 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1518 /* The new declaration is the same kind of object as the old one.
1519 The declarations may partially match. Print warnings if they don't
1520 match enough. Ultimately, copy most of the information from the new
1521 decl to the old one, and keep using the old one. */
1523 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1524 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1525 && DECL_INITIAL (olddecl) == 0)
1526 /* If -traditional, avoid error for redeclaring fcn
1527 after implicit decl. */
1529 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1530 && DECL_BUILT_IN (olddecl))
1532 /* A function declaration for a built-in function. */
1533 if (!TREE_PUBLIC (newdecl))
1535 /* If you declare a built-in function name as static, the
1536 built-in definition is overridden,
1537 but optionally warn this was a bad choice of name. */
1539 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1540 /* Discard the old built-in function. */
1543 else if (!types_match)
1545 /* Accept the return type of the new declaration if same modes. */
1546 tree oldreturntype = TREE_TYPE (oldtype);
1547 tree newreturntype = TREE_TYPE (newtype);
1549 /* Make sure we put the new type in the same obstack as the old ones.
1550 If the old types are not both in the same obstack, use the
1552 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1553 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1556 push_obstacks_nochange ();
1557 end_temporary_allocation ();
1560 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1562 /* Function types may be shared, so we can't just modify
1563 the return type of olddecl's function type. */
1565 = build_function_type (newreturntype,
1566 TYPE_ARG_TYPES (oldtype));
1568 types_match = comptypes (newtype, trytype);
1572 /* Accept harmless mismatch in first argument type also.
1574 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1575 && TYPE_ARG_TYPES (oldtype) != 0
1576 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1577 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1578 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1579 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1581 /* Function types may be shared, so we can't just modify
1582 the return type of olddecl's function type. */
1584 = build_function_type (TREE_TYPE (oldtype),
1585 tree_cons (NULL_TREE,
1586 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1587 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1589 types_match = comptypes (newtype, trytype);
1593 if (! different_binding_level)
1594 TREE_TYPE (olddecl) = oldtype;
1600 /* If types don't match for a built-in, throw away the built-in. */
1601 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1605 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1606 && DECL_SOURCE_LINE (olddecl) == 0)
1608 /* A function declaration for a predeclared function
1609 that isn't actually built in. */
1610 if (!TREE_PUBLIC (newdecl))
1612 /* If you declare it as static, the
1613 default definition is overridden. */
1616 else if (!types_match)
1618 /* If the types don't match, preserve volatility indication.
1619 Later on, we will discard everything else about the
1620 default declaration. */
1621 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1624 /* Permit char *foo () to match void *foo (...) if not pedantic,
1625 if one of them came from a system header file. */
1626 else if (!types_match
1627 && TREE_CODE (olddecl) == FUNCTION_DECL
1628 && TREE_CODE (newdecl) == FUNCTION_DECL
1629 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1630 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1631 && (DECL_IN_SYSTEM_HEADER (olddecl)
1632 || DECL_IN_SYSTEM_HEADER (newdecl))
1633 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1634 && TYPE_ARG_TYPES (oldtype) == 0
1635 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1636 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1638 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1639 && TYPE_ARG_TYPES (newtype) == 0
1640 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1641 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1644 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1645 /* Make sure we keep void * as ret type, not char *. */
1646 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1647 TREE_TYPE (newdecl) = newtype = oldtype;
1649 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1650 we will come back here again. */
1651 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1653 else if (!types_match
1654 /* Permit char *foo (int, ...); followed by char *foo ();
1656 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1658 /* Return types must still match. */
1659 && comptypes (TREE_TYPE (oldtype),
1660 TREE_TYPE (newtype))
1661 && TYPE_ARG_TYPES (newtype) == 0))
1663 error_with_decl (newdecl, "conflicting types for `%s'");
1664 /* Check for function type mismatch
1665 involving an empty arglist vs a nonempty one. */
1666 if (TREE_CODE (olddecl) == FUNCTION_DECL
1667 && comptypes (TREE_TYPE (oldtype),
1668 TREE_TYPE (newtype))
1669 && ((TYPE_ARG_TYPES (oldtype) == 0
1670 && DECL_INITIAL (olddecl) == 0)
1672 (TYPE_ARG_TYPES (newtype) == 0
1673 && DECL_INITIAL (newdecl) == 0)))
1675 /* Classify the problem further. */
1676 register tree t = TYPE_ARG_TYPES (oldtype);
1678 t = TYPE_ARG_TYPES (newtype);
1679 for (; t; t = TREE_CHAIN (t))
1681 register tree type = TREE_VALUE (t);
1683 if (TREE_CHAIN (t) == 0
1684 && TYPE_MAIN_VARIANT (type) != void_type_node)
1686 error ("A parameter list with an ellipsis can't match");
1687 error ("an empty parameter name list declaration.");
1691 if (TYPE_MAIN_VARIANT (type) == float_type_node
1692 || C_PROMOTING_INTEGER_TYPE_P (type))
1694 error ("An argument type that has a default promotion");
1695 error ("can't match an empty parameter name list declaration.");
1700 error_with_decl (olddecl, "previous declaration of `%s'");
1704 errmsg = redeclaration_error_message (newdecl, olddecl);
1707 error_with_decl (newdecl, errmsg);
1708 error_with_decl (olddecl,
1709 ((DECL_INITIAL (olddecl)
1710 && current_binding_level == global_binding_level)
1711 ? "`%s' previously defined here"
1712 : "`%s' previously declared here"));
1714 else if (TREE_CODE (newdecl) == TYPE_DECL
1715 && (DECL_IN_SYSTEM_HEADER (olddecl)
1716 || DECL_IN_SYSTEM_HEADER (newdecl)))
1718 warning_with_decl (newdecl, "redefinition of `%s'");
1721 ((DECL_INITIAL (olddecl)
1722 && current_binding_level == global_binding_level)
1723 ? "`%s' previously defined here"
1724 : "`%s' previously declared here"));
1726 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1727 && DECL_INITIAL (olddecl) != 0
1728 && TYPE_ARG_TYPES (oldtype) == 0
1729 && TYPE_ARG_TYPES (newtype) != 0
1730 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1732 register tree type, parm;
1734 /* Prototype decl follows defn w/o prototype. */
1736 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1737 type = TYPE_ARG_TYPES (newtype),
1739 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1740 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1741 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1743 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1744 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1746 errmsg = "prototype for `%s' follows and number of arguments";
1749 /* Type for passing arg must be consistent
1750 with that declared for the arg. */
1751 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1752 /* If -traditional, allow `unsigned int' instead of `int'
1753 in the prototype. */
1754 && (! (flag_traditional
1755 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1756 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1758 errmsg = "prototype for `%s' follows and argument %d";
1764 error_with_decl (newdecl, errmsg, nargs);
1765 error_with_decl (olddecl,
1766 "doesn't match non-prototype definition here");
1770 warning_with_decl (newdecl, "prototype for `%s' follows");
1771 warning_with_decl (olddecl, "non-prototype definition here");
1774 /* Warn about mismatches in various flags. */
1777 /* Warn if function is now inline
1778 but was previously declared not inline and has been called. */
1779 if (TREE_CODE (olddecl) == FUNCTION_DECL
1780 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1781 && TREE_USED (olddecl))
1782 warning_with_decl (newdecl,
1783 "`%s' declared inline after being called");
1784 if (TREE_CODE (olddecl) == FUNCTION_DECL
1785 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1786 && DECL_INITIAL (olddecl) != 0)
1787 warning_with_decl (newdecl,
1788 "`%s' declared inline after its definition");
1790 /* If pedantic, warn when static declaration follows a non-static
1791 declaration. Otherwise, do so only for functions. */
1792 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1793 && TREE_PUBLIC (olddecl)
1794 && !TREE_PUBLIC (newdecl))
1795 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1797 /* Warn when const declaration follows a non-const
1798 declaration, but not for functions. */
1799 if (TREE_CODE (olddecl) != FUNCTION_DECL
1800 && !TREE_READONLY (olddecl)
1801 && TREE_READONLY (newdecl))
1802 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1803 /* These bits are logically part of the type, for variables.
1804 But not for functions
1805 (where qualifiers are not valid ANSI anyway). */
1806 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1807 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1808 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1809 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1813 /* Optionally warn about more than one declaration for the same name. */
1814 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1815 /* Don't warn about a function declaration
1816 followed by a definition. */
1817 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1818 && DECL_INITIAL (olddecl) == 0)
1819 /* Don't warn about extern decl followed by (tentative) definition. */
1820 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1822 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1823 warning_with_decl (olddecl, "previous declaration of `%s'");
1826 /* Copy all the DECL_... slots specified in the new decl
1827 except for any that we copy here from the old type.
1829 Past this point, we don't change OLDTYPE and NEWTYPE
1830 even if we change the types of NEWDECL and OLDDECL. */
1834 /* When copying info to olddecl, we store into write_olddecl
1835 instead. This allows us to avoid modifying olddecl when
1836 different_binding_level is true. */
1837 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1839 /* Make sure we put the new type in the same obstack as the old ones.
1840 If the old types are not both in the same obstack, use the permanent
1842 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1843 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1846 push_obstacks_nochange ();
1847 end_temporary_allocation ();
1850 /* Merge the data types specified in the two decls. */
1851 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1853 if (different_binding_level)
1855 = build_type_attribute_variant
1857 merge_attributes (TYPE_ATTRIBUTES (newtype),
1858 TYPE_ATTRIBUTES (oldtype)));
1861 = TREE_TYPE (olddecl)
1862 = common_type (newtype, oldtype);
1865 /* Lay the type out, unless already done. */
1866 if (oldtype != TREE_TYPE (newdecl))
1868 if (TREE_TYPE (newdecl) != error_mark_node)
1869 layout_type (TREE_TYPE (newdecl));
1870 if (TREE_CODE (newdecl) != FUNCTION_DECL
1871 && TREE_CODE (newdecl) != TYPE_DECL
1872 && TREE_CODE (newdecl) != CONST_DECL)
1873 layout_decl (newdecl, 0);
1877 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1878 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1879 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1880 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1881 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1884 /* Keep the old rtl since we can safely use it. */
1885 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1887 /* Merge the type qualifiers. */
1888 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1889 && !TREE_THIS_VOLATILE (newdecl))
1890 TREE_THIS_VOLATILE (write_olddecl) = 0;
1891 if (TREE_READONLY (newdecl))
1892 TREE_READONLY (write_olddecl) = 1;
1893 if (TREE_THIS_VOLATILE (newdecl))
1895 TREE_THIS_VOLATILE (write_olddecl) = 1;
1896 if (TREE_CODE (newdecl) == VAR_DECL)
1897 make_var_volatile (newdecl);
1900 /* Keep source location of definition rather than declaration. */
1901 /* When called with different_binding_level set, keep the old
1902 information so that meaningful diagnostics can be given. */
1903 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1904 && ! different_binding_level)
1906 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1907 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1910 /* Merge the unused-warning information. */
1911 if (DECL_IN_SYSTEM_HEADER (olddecl))
1912 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1913 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1914 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1916 /* Merge the initialization information. */
1917 /* When called with different_binding_level set, don't copy over
1918 DECL_INITIAL, so that we don't accidentally change function
1919 declarations into function definitions. */
1920 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1921 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1923 /* Merge the section attribute.
1924 We want to issue an error if the sections conflict but that must be
1925 done later in decl_attributes since we are called before attributes
1927 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1928 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1930 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1932 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1933 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1935 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1936 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1941 /* If cannot merge, then use the new type and qualifiers,
1942 and don't preserve the old rtl. */
1943 else if (! different_binding_level)
1945 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1946 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1947 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1948 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1951 /* Merge the storage class information. */
1952 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1953 /* For functions, static overrides non-static. */
1954 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1956 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1957 /* This is since we don't automatically
1958 copy the attributes of NEWDECL into OLDDECL. */
1959 /* No need to worry about different_binding_level here because
1960 then TREE_PUBLIC (newdecl) was true. */
1961 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1962 /* If this clears `static', clear it in the identifier too. */
1963 if (! TREE_PUBLIC (olddecl))
1964 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1966 if (DECL_EXTERNAL (newdecl))
1968 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1969 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1970 /* An extern decl does not override previous storage class. */
1971 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1972 if (! DECL_EXTERNAL (newdecl))
1973 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1977 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1978 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1981 /* If either decl says `inline', this fn is inline,
1982 unless its definition was passed already. */
1983 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1984 DECL_INLINE (olddecl) = 1;
1985 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1987 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1989 if (DECL_BUILT_IN (olddecl))
1991 /* Get rid of any built-in function if new arg types don't match it
1992 or if we have a function definition. */
1993 if (! types_match || new_is_definition)
1995 if (! different_binding_level)
1997 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1998 DECL_BUILT_IN (olddecl) = 0;
2003 /* If redeclaring a builtin function, and not a definition,
2004 it stays built in. */
2005 DECL_BUILT_IN (newdecl) = 1;
2006 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2009 /* Also preserve various other info from the definition. */
2010 else if (! new_is_definition)
2011 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2012 if (! new_is_definition)
2014 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2015 /* When called with different_binding_level set, don't copy over
2016 DECL_INITIAL, so that we don't accidentally change function
2017 declarations into function definitions. */
2018 if (! different_binding_level)
2019 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2020 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2021 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2022 if (DECL_INLINE (newdecl))
2023 DECL_ABSTRACT_ORIGIN (newdecl) = olddecl;
2026 if (different_binding_level)
2028 /* Don't output a duplicate symbol or debugging information for this
2031 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2032 just have two declarations without a definition. VAR_DECLs may need
2033 the same treatment, I'm not sure. */
2034 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2035 DECL_IGNORED_P (newdecl) = 1;
2037 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2041 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2042 But preserve OLDDECL's DECL_UID. */
2044 register unsigned olddecl_uid = DECL_UID (olddecl);
2046 bcopy ((char *) newdecl + sizeof (struct tree_common),
2047 (char *) olddecl + sizeof (struct tree_common),
2048 sizeof (struct tree_decl) - sizeof (struct tree_common));
2049 DECL_UID (olddecl) = olddecl_uid;
2052 /* NEWDECL contains the merged attribute lists.
2053 Update OLDDECL to be the same. */
2054 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2059 /* Record a decl-node X as belonging to the current lexical scope.
2060 Check for errors (such as an incompatible declaration for the same
2061 name already seen in the same scope).
2063 Returns either X or an old decl for the same name.
2064 If an old decl is returned, it may have been smashed
2065 to agree with what X says. */
2072 register tree name = DECL_NAME (x);
2073 register struct binding_level *b = current_binding_level;
2075 DECL_CONTEXT (x) = current_function_decl;
2076 /* A local extern declaration for a function doesn't constitute nesting.
2077 A local auto declaration does, since it's a forward decl
2078 for a nested function coming later. */
2079 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2080 && DECL_EXTERNAL (x))
2081 DECL_CONTEXT (x) = 0;
2083 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2084 && x != IDENTIFIER_IMPLICIT_DECL (name)
2085 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2086 && !DECL_IN_SYSTEM_HEADER (x))
2087 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2093 int different_binding_level = 0;
2095 t = lookup_name_current_level (name);
2096 /* Don't type check externs here when -traditional. This is so that
2097 code with conflicting declarations inside blocks will get warnings
2098 not errors. X11 for instance depends on this. */
2099 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2101 t = IDENTIFIER_GLOBAL_VALUE (name);
2102 /* Type decls at global scope don't conflict with externs declared
2103 inside lexical blocks. */
2104 if (t && TREE_CODE (t) == TYPE_DECL)
2106 different_binding_level = 1;
2108 if (t != 0 && t == error_mark_node)
2109 /* error_mark_node is 0 for a while during initialization! */
2112 error_with_decl (x, "`%s' used prior to declaration");
2117 file = DECL_SOURCE_FILE (t);
2118 line = DECL_SOURCE_LINE (t);
2121 /* If this decl is `static' and an implicit decl was seen previously,
2122 warn. But don't complain if -traditional,
2123 since traditional compilers don't complain. */
2124 if (! flag_traditional && TREE_PUBLIC (name)
2125 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2126 sets this for all functions. */
2127 && ! TREE_PUBLIC (x)
2128 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2129 /* We used to warn also for explicit extern followed by static,
2130 but sometimes you need to do it that way. */
2131 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2133 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2134 IDENTIFIER_POINTER (name));
2135 pedwarn_with_file_and_line
2136 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2137 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2138 "previous declaration of `%s'",
2139 IDENTIFIER_POINTER (name));
2140 TREE_THIS_VOLATILE (name) = 1;
2143 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2145 if (TREE_CODE (t) == PARM_DECL)
2147 /* Don't allow more than one "real" duplicate
2148 of a forward parm decl. */
2149 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2155 /* If we are processing a typedef statement, generate a whole new
2156 ..._TYPE node (which will be just an variant of the existing
2157 ..._TYPE node with identical properties) and then install the
2158 TYPE_DECL node generated to represent the typedef name as the
2159 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2161 The whole point here is to end up with a situation where each
2162 and every ..._TYPE node the compiler creates will be uniquely
2163 associated with AT MOST one node representing a typedef name.
2164 This way, even though the compiler substitutes corresponding
2165 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2166 early on, later parts of the compiler can always do the reverse
2167 translation and get back the corresponding typedef name. For
2170 typedef struct S MY_TYPE;
2173 Later parts of the compiler might only know that `object' was of
2174 type `struct S' if it were not for code just below. With this
2175 code however, later parts of the compiler see something like:
2177 struct S' == struct S
2178 typedef struct S' MY_TYPE;
2181 And they can then deduce (from the node for type struct S') that
2182 the original object declaration was:
2186 Being able to do this is important for proper support of protoize,
2187 and also for generating precise symbolic debugging information
2188 which takes full account of the programmer's (typedef) vocabulary.
2190 Obviously, we don't want to generate a duplicate ..._TYPE node if
2191 the TYPE_DECL node that we are now processing really represents a
2192 standard built-in type.
2194 Since all standard types are effectively declared at line zero
2195 in the source file, we can easily check to see if we are working
2196 on a standard type by checking the current value of lineno. */
2198 if (TREE_CODE (x) == TYPE_DECL)
2200 if (DECL_SOURCE_LINE (x) == 0)
2202 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2203 TYPE_NAME (TREE_TYPE (x)) = x;
2205 else if (TREE_TYPE (x) != error_mark_node
2206 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2208 tree tt = TREE_TYPE (x);
2209 DECL_ORIGINAL_TYPE (x) = tt;
2210 tt = build_type_copy (tt);
2216 /* Multiple external decls of the same identifier ought to match.
2217 Check against both global declarations (when traditional) and out of
2218 scope (limbo) block level declarations.
2220 We get warnings about inline functions where they are defined.
2221 Avoid duplicate warnings where they are used. */
2222 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2226 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2227 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2228 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2229 decl = IDENTIFIER_GLOBAL_VALUE (name);
2230 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2231 /* Decls in limbo are always extern, so no need to check that. */
2232 decl = IDENTIFIER_LIMBO_VALUE (name);
2236 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2237 /* If old decl is built-in, we already warned if we should. */
2238 && !DECL_BUILT_IN (decl))
2240 pedwarn_with_decl (x,
2241 "type mismatch with previous external decl");
2242 pedwarn_with_decl (decl, "previous external decl of `%s'");
2246 /* If a function has had an implicit declaration, and then is defined,
2247 make sure they are compatible. */
2249 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2250 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2251 && TREE_CODE (x) == FUNCTION_DECL
2252 && ! comptypes (TREE_TYPE (x),
2253 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2255 warning_with_decl (x, "type mismatch with previous implicit declaration");
2256 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2257 "previous implicit declaration of `%s'");
2260 /* In PCC-compatibility mode, extern decls of vars with no current decl
2261 take effect at top level no matter where they are. */
2262 if (flag_traditional && DECL_EXTERNAL (x)
2263 && lookup_name (name) == 0)
2265 tree type = TREE_TYPE (x);
2267 /* But don't do this if the type contains temporary nodes. */
2270 if (type == error_mark_node)
2272 if (! TREE_PERMANENT (type))
2274 warning_with_decl (x, "type of external `%s' is not global");
2275 /* By exiting the loop early, we leave TYPE nonzero,
2276 and thus prevent globalization of the decl. */
2279 else if (TREE_CODE (type) == FUNCTION_TYPE
2280 && TYPE_ARG_TYPES (type) != 0)
2281 /* The types might not be truly local,
2282 but the list of arg types certainly is temporary.
2283 Since prototypes are nontraditional,
2284 ok not to do the traditional thing. */
2286 type = TREE_TYPE (type);
2290 b = global_binding_level;
2293 /* This name is new in its binding level.
2294 Install the new declaration and return it. */
2295 if (b == global_binding_level)
2297 /* Install a global value. */
2299 /* If the first global decl has external linkage,
2300 warn if we later see static one. */
2301 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2302 TREE_PUBLIC (name) = 1;
2304 IDENTIFIER_GLOBAL_VALUE (name) = x;
2306 /* We no longer care about any previous block level declarations. */
2307 IDENTIFIER_LIMBO_VALUE (name) = 0;
2309 /* Don't forget if the function was used via an implicit decl. */
2310 if (IDENTIFIER_IMPLICIT_DECL (name)
2311 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2312 TREE_USED (x) = 1, TREE_USED (name) = 1;
2314 /* Don't forget if its address was taken in that way. */
2315 if (IDENTIFIER_IMPLICIT_DECL (name)
2316 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2317 TREE_ADDRESSABLE (x) = 1;
2319 /* Warn about mismatches against previous implicit decl. */
2320 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2321 /* If this real decl matches the implicit, don't complain. */
2322 && ! (TREE_CODE (x) == FUNCTION_DECL
2323 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2324 == integer_type_node)))
2325 pedwarn ("`%s' was previously implicitly declared to return `int'",
2326 IDENTIFIER_POINTER (name));
2328 /* If this decl is `static' and an `extern' was seen previously,
2329 that is erroneous. */
2330 if (TREE_PUBLIC (name)
2331 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2333 /* Okay to redeclare an ANSI built-in as static. */
2334 if (t != 0 && DECL_BUILT_IN (t))
2336 /* Okay to declare a non-ANSI built-in as anything. */
2337 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2339 /* Okay to have global type decl after an earlier extern
2340 declaration inside a lexical block. */
2341 else if (TREE_CODE (x) == TYPE_DECL)
2343 else if (IDENTIFIER_IMPLICIT_DECL (name))
2345 if (! TREE_THIS_VOLATILE (name))
2346 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2347 IDENTIFIER_POINTER (name));
2350 pedwarn ("`%s' was declared `extern' and later `static'",
2351 IDENTIFIER_POINTER (name));
2356 /* Here to install a non-global value. */
2357 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2358 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2359 IDENTIFIER_LOCAL_VALUE (name) = x;
2361 /* If this is an extern function declaration, see if we
2362 have a global definition or declaration for the function. */
2364 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2366 && TREE_CODE (x) == FUNCTION_DECL
2367 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2369 /* We have one. Their types must agree. */
2370 if (! comptypes (TREE_TYPE (x),
2371 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2372 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2375 /* Inner extern decl is inline if global one is.
2376 Copy enough to really inline it. */
2377 if (DECL_INLINE (oldglobal))
2379 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2380 DECL_INITIAL (x) = (current_function_decl == oldglobal
2381 ? 0 : DECL_INITIAL (oldglobal));
2382 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2383 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2384 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2385 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2386 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2387 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2389 /* Inner extern decl is built-in if global one is. */
2390 if (DECL_BUILT_IN (oldglobal))
2392 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2393 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2395 /* Keep the arg types from a file-scope fcn defn. */
2396 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2397 && DECL_INITIAL (oldglobal)
2398 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2399 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2403 #if 0 /* This case is probably sometimes the right thing to do. */
2404 /* If we have a local external declaration,
2405 then any file-scope declaration should not
2406 have been static. */
2407 if (oldlocal == 0 && oldglobal != 0
2408 && !TREE_PUBLIC (oldglobal)
2409 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2410 warning ("`%s' locally external but globally static",
2411 IDENTIFIER_POINTER (name));
2414 /* If we have a local external declaration,
2415 and no file-scope declaration has yet been seen,
2416 then if we later have a file-scope decl it must not be static. */
2418 && DECL_EXTERNAL (x)
2422 TREE_PUBLIC (name) = 1;
2424 /* Save this decl, so that we can do type checking against
2425 other decls after it falls out of scope.
2427 Only save it once. This prevents temporary decls created in
2428 expand_inline_function from being used here, since this
2429 will have been set when the inline function was parsed.
2430 It also helps give slightly better warnings. */
2431 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2432 IDENTIFIER_LIMBO_VALUE (name) = x;
2435 /* Warn if shadowing an argument at the top level of the body. */
2436 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2437 /* This warning doesn't apply to the parms of a nested fcn. */
2438 && ! current_binding_level->parm_flag
2439 /* Check that this is one level down from the parms. */
2440 && current_binding_level->level_chain->parm_flag
2441 /* Check that the decl being shadowed
2442 comes from the parm level, one level up. */
2443 && chain_member (oldlocal, current_binding_level->level_chain->names))
2445 if (TREE_CODE (oldlocal) == PARM_DECL)
2446 pedwarn ("declaration of `%s' shadows a parameter",
2447 IDENTIFIER_POINTER (name));
2449 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2450 IDENTIFIER_POINTER (name));
2453 /* Maybe warn if shadowing something else. */
2454 else if (warn_shadow && !DECL_EXTERNAL (x)
2455 /* No shadow warnings for internally generated vars. */
2456 && DECL_SOURCE_LINE (x) != 0
2457 /* No shadow warnings for vars made for inlining. */
2458 && ! DECL_FROM_INLINE (x))
2460 char *warnstring = 0;
2462 if (TREE_CODE (x) == PARM_DECL
2463 && current_binding_level->level_chain->parm_flag)
2464 /* Don't warn about the parm names in function declarator
2465 within a function declarator.
2466 It would be nice to avoid warning in any function
2467 declarator in a declaration, as opposed to a definition,
2468 but there is no way to tell it's not a definition. */
2470 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2471 warnstring = "declaration of `%s' shadows a parameter";
2472 else if (oldlocal != 0)
2473 warnstring = "declaration of `%s' shadows previous local";
2474 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2475 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2476 warnstring = "declaration of `%s' shadows global declaration";
2479 warning (warnstring, IDENTIFIER_POINTER (name));
2482 /* If storing a local value, there may already be one (inherited).
2483 If so, record it for restoration when this binding level ends. */
2485 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2488 /* Keep count of variables in this level with incomplete type. */
2489 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2493 /* Put decls on list in reverse order.
2494 We will reverse them later if necessary. */
2495 TREE_CHAIN (x) = b->names;
2501 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2504 pushdecl_top_level (x)
2508 register struct binding_level *b = current_binding_level;
2510 current_binding_level = global_binding_level;
2512 current_binding_level = b;
2516 /* Generate an implicit declaration for identifier FUNCTIONID
2517 as a function of type int (). Print a warning if appropriate. */
2520 implicitly_declare (functionid)
2524 int traditional_warning = 0;
2525 /* Only one "implicit declaration" warning per identifier. */
2526 int implicit_warning;
2528 /* Save the decl permanently so we can warn if definition follows. */
2529 push_obstacks_nochange ();
2530 end_temporary_allocation ();
2532 /* We used to reuse an old implicit decl here,
2533 but this loses with inline functions because it can clobber
2534 the saved decl chains. */
2535 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2536 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2538 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2540 /* Warn of implicit decl following explicit local extern decl.
2541 This is probably a program designed for traditional C. */
2542 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2543 traditional_warning = 1;
2545 /* Warn once of an implicit declaration. */
2546 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2548 DECL_EXTERNAL (decl) = 1;
2549 TREE_PUBLIC (decl) = 1;
2551 /* Record that we have an implicit decl and this is it. */
2552 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2554 /* ANSI standard says implicit declarations are in the innermost block.
2555 So we record the decl in the standard fashion.
2556 If flag_traditional is set, pushdecl does it top-level. */
2559 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2560 maybe_objc_check_decl (decl);
2562 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2564 if (mesg_implicit_function_declaration && implicit_warning)
2566 if (mesg_implicit_function_declaration == 2)
2567 error ("implicit declaration of function `%s'",
2568 IDENTIFIER_POINTER (functionid));
2570 warning ("implicit declaration of function `%s'",
2571 IDENTIFIER_POINTER (functionid));
2573 else if (warn_traditional && traditional_warning)
2574 warning ("function `%s' was previously declared within a block",
2575 IDENTIFIER_POINTER (functionid));
2577 /* Write a record describing this implicit function declaration to the
2578 prototypes file (if requested). */
2580 gen_aux_info_record (decl, 0, 1, 0);
2587 /* Return zero if the declaration NEWDECL is valid
2588 when the declaration OLDDECL (assumed to be for the same name)
2589 has already been seen.
2590 Otherwise return an error message format string with a %s
2591 where the identifier should go. */
2594 redeclaration_error_message (newdecl, olddecl)
2595 tree newdecl, olddecl;
2597 if (TREE_CODE (newdecl) == TYPE_DECL)
2599 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2601 /* pushdecl creates distinct types for TYPE_DECLs by calling
2602 build_type_copy, so the above comparison generally fails. We do
2603 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2604 is equivalent to what this code used to do before the build_type_copy
2605 call. The variant type distinction should not matter for traditional
2606 code, because it doesn't have type qualifiers. */
2607 if (flag_traditional
2608 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2610 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2612 return "redefinition of `%s'";
2614 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2616 /* Declarations of functions can insist on internal linkage
2617 but they can't be inconsistent with internal linkage,
2618 so there can be no error on that account.
2619 However defining the same name twice is no good. */
2620 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2621 /* However, defining once as extern inline and a second
2622 time in another way is ok. */
2623 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2624 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2625 return "redefinition of `%s'";
2628 else if (current_binding_level == global_binding_level)
2630 /* Objects declared at top level: */
2631 /* If at least one is a reference, it's ok. */
2632 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2634 /* Reject two definitions. */
2635 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2636 return "redefinition of `%s'";
2637 /* Now we have two tentative defs, or one tentative and one real def. */
2638 /* Insist that the linkage match. */
2639 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2640 return "conflicting declarations of `%s'";
2643 else if (current_binding_level->parm_flag
2644 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2648 /* Newdecl has block scope. If olddecl has block scope also, then
2649 reject two definitions, and reject a definition together with an
2650 external reference. Otherwise, it is OK, because newdecl must
2651 be an extern reference to olddecl. */
2652 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2653 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2654 return "redeclaration of `%s'";
2659 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2660 Create one if none exists so far for the current function.
2661 This function is called for both label definitions and label references. */
2667 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2669 if (current_function_decl == 0)
2671 error ("label %s referenced outside of any function",
2672 IDENTIFIER_POINTER (id));
2676 /* Use a label already defined or ref'd with this name. */
2679 /* But not if it is inherited and wasn't declared to be inheritable. */
2680 if (DECL_CONTEXT (decl) != current_function_decl
2681 && ! C_DECLARED_LABEL_FLAG (decl))
2682 return shadow_label (id);
2686 decl = build_decl (LABEL_DECL, id, void_type_node);
2688 /* Make sure every label has an rtx. */
2691 /* A label not explicitly declared must be local to where it's ref'd. */
2692 DECL_CONTEXT (decl) = current_function_decl;
2694 DECL_MODE (decl) = VOIDmode;
2696 /* Say where one reference is to the label,
2697 for the sake of the error if it is not defined. */
2698 DECL_SOURCE_LINE (decl) = lineno;
2699 DECL_SOURCE_FILE (decl) = input_filename;
2701 IDENTIFIER_LABEL_VALUE (id) = decl;
2703 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2708 /* Make a label named NAME in the current function,
2709 shadowing silently any that may be inherited from containing functions
2710 or containing scopes.
2712 Note that valid use, if the label being shadowed
2713 comes from another scope in the same function,
2714 requires calling declare_nonlocal_label right away. */
2720 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2726 /* Check to make sure that the label hasn't already been declared
2727 at this label scope */
2728 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2729 if (TREE_VALUE (dup) == decl)
2731 error ("duplicate label declaration `%s'",
2732 IDENTIFIER_POINTER (name));
2733 error_with_decl (TREE_VALUE (dup),
2734 "this is a previous declaration");
2735 /* Just use the previous declaration. */
2736 return lookup_label (name);
2739 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2740 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2743 return lookup_label (name);
2746 /* Define a label, specifying the location in the source file.
2747 Return the LABEL_DECL node for the label, if the definition is valid.
2748 Otherwise return 0. */
2751 define_label (filename, line, name)
2756 tree decl = lookup_label (name);
2758 /* If label with this name is known from an outer context, shadow it. */
2759 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2761 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2762 IDENTIFIER_LABEL_VALUE (name) = 0;
2763 decl = lookup_label (name);
2766 if (DECL_INITIAL (decl) != 0)
2768 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2773 /* Mark label as having been defined. */
2774 DECL_INITIAL (decl) = error_mark_node;
2775 /* Say where in the source. */
2776 DECL_SOURCE_FILE (decl) = filename;
2777 DECL_SOURCE_LINE (decl) = line;
2782 /* Return the list of declarations of the current level.
2783 Note that this list is in reverse order unless/until
2784 you nreverse it; and when you do nreverse it, you must
2785 store the result back using `storedecls' or you will lose. */
2790 return current_binding_level->names;
2793 /* Return the list of type-tags (for structs, etc) of the current level. */
2798 return current_binding_level->tags;
2801 /* Store the list of declarations of the current level.
2802 This is done for the parameter declarations of a function being defined,
2803 after they are modified in the light of any missing parameters. */
2809 current_binding_level->names = decls;
2812 /* Similarly, store the list of tags of the current level. */
2818 current_binding_level->tags = tags;
2821 /* Given NAME, an IDENTIFIER_NODE,
2822 return the structure (or union or enum) definition for that name.
2823 Searches binding levels from BINDING_LEVEL up to the global level.
2824 If THISLEVEL_ONLY is nonzero, searches only the specified context
2825 (but skips any tag-transparent contexts to find one that is
2826 meaningful for tags).
2827 CODE says which kind of type the caller wants;
2828 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2829 If the wrong kind of type is found, an error is reported. */
2832 lookup_tag (code, name, binding_level, thislevel_only)
2833 enum tree_code code;
2834 struct binding_level *binding_level;
2838 register struct binding_level *level;
2840 for (level = binding_level; level; level = level->level_chain)
2843 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2845 if (TREE_PURPOSE (tail) == name)
2847 if (TREE_CODE (TREE_VALUE (tail)) != code)
2849 /* Definition isn't the kind we were looking for. */
2850 pending_invalid_xref = name;
2851 pending_invalid_xref_file = input_filename;
2852 pending_invalid_xref_line = lineno;
2854 return TREE_VALUE (tail);
2857 if (thislevel_only && ! level->tag_transparent)
2863 /* Print an error message now
2864 for a recent invalid struct, union or enum cross reference.
2865 We don't print them immediately because they are not invalid
2866 when used in the `struct foo;' construct for shadowing. */
2869 pending_xref_error ()
2871 if (pending_invalid_xref != 0)
2872 error_with_file_and_line (pending_invalid_xref_file,
2873 pending_invalid_xref_line,
2874 "`%s' defined as wrong kind of tag",
2875 IDENTIFIER_POINTER (pending_invalid_xref));
2876 pending_invalid_xref = 0;
2879 /* Given a type, find the tag that was defined for it and return the tag name.
2880 Otherwise return 0. */
2883 lookup_tag_reverse (type)
2886 register struct binding_level *level;
2888 for (level = current_binding_level; level; level = level->level_chain)
2891 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2893 if (TREE_VALUE (tail) == type)
2894 return TREE_PURPOSE (tail);
2900 /* Look up NAME in the current binding level and its superiors
2901 in the namespace of variables, functions and typedefs.
2902 Return a ..._DECL node of some kind representing its definition,
2903 or return 0 if it is undefined. */
2910 if (current_binding_level != global_binding_level
2911 && IDENTIFIER_LOCAL_VALUE (name))
2912 val = IDENTIFIER_LOCAL_VALUE (name);
2914 val = IDENTIFIER_GLOBAL_VALUE (name);
2918 /* Similar to `lookup_name' but look only at current binding level. */
2921 lookup_name_current_level (name)
2926 if (current_binding_level == global_binding_level)
2927 return IDENTIFIER_GLOBAL_VALUE (name);
2929 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2932 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2933 if (DECL_NAME (t) == name)
2939 /* Create the predefined scalar types of C,
2940 and some nodes representing standard constants (0, 1, (void *) 0).
2941 Initialize the global binding level.
2942 Make definitions for built-in primitive functions. */
2945 init_decl_processing ()
2947 register tree endlink;
2948 /* Either char* or void*. */
2949 tree traditional_ptr_type_node;
2950 /* Data types of memcpy and strlen. */
2951 tree memcpy_ftype, memset_ftype, strlen_ftype;
2952 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2953 int wchar_type_size;
2955 tree array_domain_type;
2957 current_function_decl = NULL;
2958 named_labels = NULL;
2959 current_binding_level = NULL_BINDING_LEVEL;
2960 free_binding_level = NULL_BINDING_LEVEL;
2961 pushlevel (0); /* make the binding_level structure for global names */
2962 global_binding_level = current_binding_level;
2964 /* Define `int' and `char' first so that dbx will output them first. */
2966 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2967 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2968 integer_type_node));
2970 /* Define `char', which is like either `signed char' or `unsigned char'
2971 but not the same as either. */
2975 ? make_signed_type (CHAR_TYPE_SIZE)
2976 : make_unsigned_type (CHAR_TYPE_SIZE));
2977 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2980 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2981 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2982 long_integer_type_node));
2984 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2985 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2986 unsigned_type_node));
2988 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2989 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2990 long_unsigned_type_node));
2992 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2993 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2994 long_long_integer_type_node));
2996 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2997 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2998 long_long_unsigned_type_node));
3000 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
3001 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3002 short_integer_type_node));
3004 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
3005 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3006 short_unsigned_type_node));
3008 /* `unsigned long' is the standard type for sizeof.
3009 Traditionally, use a signed type.
3010 Note that stddef.h uses `unsigned long',
3011 and this must agree, even if long and int are the same size. */
3013 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3014 if (flag_traditional && TREE_UNSIGNED (sizetype))
3015 set_sizetype (signed_type (sizetype));
3018 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3020 error_mark_node = make_node (ERROR_MARK);
3021 TREE_TYPE (error_mark_node) = error_mark_node;
3023 /* Define both `signed char' and `unsigned char'. */
3024 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3025 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3026 signed_char_type_node));
3028 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3029 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3030 unsigned_char_type_node));
3032 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3033 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3035 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3036 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3038 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3041 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3042 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3044 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3045 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3047 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3050 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3051 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3053 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3054 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3056 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3057 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3059 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3060 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3062 float_type_node = make_node (REAL_TYPE);
3063 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3064 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3066 layout_type (float_type_node);
3068 double_type_node = make_node (REAL_TYPE);
3069 if (flag_short_double)
3070 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3072 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3073 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3075 layout_type (double_type_node);
3077 long_double_type_node = make_node (REAL_TYPE);
3078 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3079 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3080 long_double_type_node));
3081 layout_type (long_double_type_node);
3083 complex_integer_type_node = make_node (COMPLEX_TYPE);
3084 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3085 complex_integer_type_node));
3086 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3087 layout_type (complex_integer_type_node);
3089 complex_float_type_node = make_node (COMPLEX_TYPE);
3090 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3091 complex_float_type_node));
3092 TREE_TYPE (complex_float_type_node) = float_type_node;
3093 layout_type (complex_float_type_node);
3095 complex_double_type_node = make_node (COMPLEX_TYPE);
3096 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3097 complex_double_type_node));
3098 TREE_TYPE (complex_double_type_node) = double_type_node;
3099 layout_type (complex_double_type_node);
3101 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3102 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3103 complex_long_double_type_node));
3104 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3105 layout_type (complex_long_double_type_node);
3108 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3109 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3110 signed_wchar_type_node = signed_type (wchar_type_node);
3111 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3113 integer_zero_node = build_int_2 (0, 0);
3114 TREE_TYPE (integer_zero_node) = integer_type_node;
3115 integer_one_node = build_int_2 (1, 0);
3116 TREE_TYPE (integer_one_node) = integer_type_node;
3118 boolean_type_node = integer_type_node;
3119 boolean_true_node = integer_one_node;
3120 boolean_false_node = integer_zero_node;
3122 size_zero_node = build_int_2 (0, 0);
3123 TREE_TYPE (size_zero_node) = sizetype;
3124 size_one_node = build_int_2 (1, 0);
3125 TREE_TYPE (size_one_node) = sizetype;
3127 void_type_node = make_node (VOID_TYPE);
3128 pushdecl (build_decl (TYPE_DECL,
3129 ridpointers[(int) RID_VOID], void_type_node));
3130 layout_type (void_type_node); /* Uses integer_zero_node */
3131 /* We are not going to have real types in C with less than byte alignment,
3132 so we might as well not have any types that claim to have it. */
3133 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3135 null_pointer_node = build_int_2 (0, 0);
3136 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3137 layout_type (TREE_TYPE (null_pointer_node));
3139 string_type_node = build_pointer_type (char_type_node);
3140 const_string_type_node
3141 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3143 /* Make a type to be the domain of a few array types
3144 whose domains don't really matter.
3145 200 is small enough that it always fits in size_t
3146 and large enough that it can hold most function names for the
3147 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3148 array_domain_type = build_index_type (build_int_2 (200, 0));
3150 /* make a type for arrays of characters.
3151 With luck nothing will ever really depend on the length of this
3153 char_array_type_node
3154 = build_array_type (char_type_node, array_domain_type);
3155 /* Likewise for arrays of ints. */
3157 = build_array_type (integer_type_node, array_domain_type);
3158 /* This is for wide string constants. */
3159 wchar_array_type_node
3160 = build_array_type (wchar_type_node, array_domain_type);
3162 default_function_type
3163 = build_function_type (integer_type_node, NULL_TREE);
3165 ptr_type_node = build_pointer_type (void_type_node);
3167 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3169 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3172 = build_function_type (void_type_node, NULL_TREE);
3175 = build_function_type (float_type_node,
3176 tree_cons (NULL_TREE, float_type_node, endlink));
3179 = build_function_type (double_type_node,
3180 tree_cons (NULL_TREE, double_type_node, endlink));
3182 ldouble_ftype_ldouble
3183 = build_function_type (long_double_type_node,
3184 tree_cons (NULL_TREE, long_double_type_node,
3187 double_ftype_double_double
3188 = build_function_type (double_type_node,
3189 tree_cons (NULL_TREE, double_type_node,
3190 tree_cons (NULL_TREE,
3191 double_type_node, endlink)));
3194 = build_function_type (integer_type_node,
3195 tree_cons (NULL_TREE, integer_type_node, endlink));
3198 = build_function_type (long_integer_type_node,
3199 tree_cons (NULL_TREE,
3200 long_integer_type_node, endlink));
3202 void_ftype_ptr_ptr_int
3203 = build_function_type (void_type_node,
3204 tree_cons (NULL_TREE, ptr_type_node,
3205 tree_cons (NULL_TREE, ptr_type_node,
3206 tree_cons (NULL_TREE,
3210 int_ftype_cptr_cptr_sizet
3211 = build_function_type (integer_type_node,
3212 tree_cons (NULL_TREE, const_ptr_type_node,
3213 tree_cons (NULL_TREE, const_ptr_type_node,
3214 tree_cons (NULL_TREE,
3218 void_ftype_ptr_int_int
3219 = build_function_type (void_type_node,
3220 tree_cons (NULL_TREE, ptr_type_node,
3221 tree_cons (NULL_TREE, integer_type_node,
3222 tree_cons (NULL_TREE,
3226 string_ftype_ptr_ptr /* strcpy prototype */
3227 = build_function_type (string_type_node,
3228 tree_cons (NULL_TREE, string_type_node,
3229 tree_cons (NULL_TREE,
3230 const_string_type_node,
3233 int_ftype_string_string /* strcmp prototype */
3234 = build_function_type (integer_type_node,
3235 tree_cons (NULL_TREE, const_string_type_node,
3236 tree_cons (NULL_TREE,
3237 const_string_type_node,
3240 strlen_ftype /* strlen prototype */
3241 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3242 tree_cons (NULL_TREE, const_string_type_node,
3245 traditional_ptr_type_node
3246 = (flag_traditional ? string_type_node : ptr_type_node);
3248 memcpy_ftype /* memcpy prototype */
3249 = build_function_type (traditional_ptr_type_node,
3250 tree_cons (NULL_TREE, ptr_type_node,
3251 tree_cons (NULL_TREE, const_ptr_type_node,
3252 tree_cons (NULL_TREE,
3256 memset_ftype /* memset prototype */
3257 = build_function_type (traditional_ptr_type_node,
3258 tree_cons (NULL_TREE, ptr_type_node,
3259 tree_cons (NULL_TREE, integer_type_node,
3260 tree_cons (NULL_TREE,
3264 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3266 = build_function_type (ptr_type_node,
3267 tree_cons (NULL_TREE, ptr_type_node, endlink));
3269 builtin_function ("__builtin_constant_p", default_function_type,
3270 BUILT_IN_CONSTANT_P, NULL_PTR);
3272 builtin_function ("__builtin_return_address",
3273 build_function_type (ptr_type_node,
3274 tree_cons (NULL_TREE,
3277 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3279 builtin_function ("__builtin_frame_address",
3280 build_function_type (ptr_type_node,
3281 tree_cons (NULL_TREE,
3284 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3286 builtin_function ("__builtin_aggregate_incoming_address",
3287 build_function_type (ptr_type_node, NULL_TREE),
3288 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3290 /* Hooks for the DWARF 2 __throw routine. */
3291 builtin_function ("__builtin_unwind_init",
3292 build_function_type (void_type_node, endlink),
3293 BUILT_IN_UNWIND_INIT, NULL_PTR);
3294 builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
3295 builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
3296 builtin_function ("__builtin_dwarf_fp_regnum",
3297 build_function_type (unsigned_type_node, endlink),
3298 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3299 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3300 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3301 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3302 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3303 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3304 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3305 builtin_function ("__builtin_set_return_addr_reg",
3306 build_function_type (void_type_node,
3307 tree_cons (NULL_TREE,
3310 BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
3311 builtin_function ("__builtin_eh_stub_old", ptr_ftype_void,
3312 BUILT_IN_EH_STUB_OLD, NULL_PTR);
3313 builtin_function ("__builtin_eh_stub", ptr_ftype_void,
3314 BUILT_IN_EH_STUB, NULL_PTR);
3316 ("__builtin_set_eh_regs",
3317 build_function_type (void_type_node,
3318 tree_cons (NULL_TREE, ptr_type_node,
3319 tree_cons (NULL_TREE,
3320 type_for_mode (ptr_mode, 0),
3322 BUILT_IN_SET_EH_REGS, NULL_PTR);
3324 builtin_function ("__builtin_alloca",
3325 build_function_type (ptr_type_node,
3326 tree_cons (NULL_TREE,
3329 BUILT_IN_ALLOCA, "alloca");
3330 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3331 /* Define alloca, ffs as builtins.
3332 Declare _exit just to mark it as volatile. */
3333 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3335 temp = builtin_function ("alloca",
3336 build_function_type (ptr_type_node,
3337 tree_cons (NULL_TREE,
3340 BUILT_IN_ALLOCA, NULL_PTR);
3341 /* Suppress error if redefined as a non-function. */
3342 DECL_BUILT_IN_NONANSI (temp) = 1;
3343 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3344 /* Suppress error if redefined as a non-function. */
3345 DECL_BUILT_IN_NONANSI (temp) = 1;
3346 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3348 TREE_THIS_VOLATILE (temp) = 1;
3349 TREE_SIDE_EFFECTS (temp) = 1;
3350 /* Suppress error if redefined as a non-function. */
3351 DECL_BUILT_IN_NONANSI (temp) = 1;
3354 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3355 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3357 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3359 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3361 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3363 builtin_function ("__builtin_saveregs",
3364 build_function_type (ptr_type_node, NULL_TREE),
3365 BUILT_IN_SAVEREGS, NULL_PTR);
3366 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3368 builtin_function ("__builtin_varargs",
3369 build_function_type (ptr_type_node,
3370 tree_cons (NULL_TREE,
3373 BUILT_IN_VARARGS, NULL_PTR);
3375 builtin_function ("__builtin_classify_type", default_function_type,
3376 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3377 builtin_function ("__builtin_next_arg",
3378 build_function_type (ptr_type_node, NULL_TREE),
3379 BUILT_IN_NEXT_ARG, NULL_PTR);
3380 builtin_function ("__builtin_args_info",
3381 build_function_type (integer_type_node,
3382 tree_cons (NULL_TREE,
3385 BUILT_IN_ARGS_INFO, NULL_PTR);
3387 /* Untyped call and return. */
3388 builtin_function ("__builtin_apply_args",
3389 build_function_type (ptr_type_node, NULL_TREE),
3390 BUILT_IN_APPLY_ARGS, NULL_PTR);
3392 temp = tree_cons (NULL_TREE,
3393 build_pointer_type (build_function_type (void_type_node,
3395 tree_cons (NULL_TREE,
3397 tree_cons (NULL_TREE,
3400 builtin_function ("__builtin_apply",
3401 build_function_type (ptr_type_node, temp),
3402 BUILT_IN_APPLY, NULL_PTR);
3403 builtin_function ("__builtin_return",
3404 build_function_type (void_type_node,
3405 tree_cons (NULL_TREE,
3408 BUILT_IN_RETURN, NULL_PTR);
3410 /* Currently under experimentation. */
3411 builtin_function ("__builtin_memcpy", memcpy_ftype,
3412 BUILT_IN_MEMCPY, "memcpy");
3413 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3414 BUILT_IN_MEMCMP, "memcmp");
3415 builtin_function ("__builtin_memset", memset_ftype,
3416 BUILT_IN_MEMSET, "memset");
3417 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3418 BUILT_IN_STRCMP, "strcmp");
3419 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3420 BUILT_IN_STRCPY, "strcpy");
3421 builtin_function ("__builtin_strlen", strlen_ftype,
3422 BUILT_IN_STRLEN, "strlen");
3423 builtin_function ("__builtin_sqrtf", float_ftype_float,
3424 BUILT_IN_FSQRT, "sqrtf");
3425 builtin_function ("__builtin_fsqrt", double_ftype_double,
3426 BUILT_IN_FSQRT, "sqrt");
3427 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3428 BUILT_IN_FSQRT, "sqrtl");
3429 builtin_function ("__builtin_sinf", float_ftype_float,
3430 BUILT_IN_SIN, "sinf");
3431 builtin_function ("__builtin_sin", double_ftype_double,
3432 BUILT_IN_SIN, "sin");
3433 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3434 BUILT_IN_SIN, "sinl");
3435 builtin_function ("__builtin_cosf", float_ftype_float,
3436 BUILT_IN_COS, "cosf");
3437 builtin_function ("__builtin_cos", double_ftype_double,
3438 BUILT_IN_COS, "cos");
3439 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3440 BUILT_IN_COS, "cosl");
3441 builtin_function ("__builtin_setjmp",
3442 build_function_type (integer_type_node,
3443 tree_cons (NULL_TREE,
3444 ptr_type_node, endlink)),
3445 BUILT_IN_SETJMP, NULL_PTR);
3446 builtin_function ("__builtin_longjmp",
3449 tree_cons (NULL, ptr_type_node,
3450 tree_cons (NULL_TREE,
3453 BUILT_IN_LONGJMP, NULL_PTR);
3454 builtin_function ("__builtin_trap",
3455 build_function_type (void_type_node, endlink),
3456 BUILT_IN_TRAP, NULL_PTR);
3458 /* In an ANSI C program, it is okay to supply built-in meanings
3459 for these functions, since applications cannot validly use them
3460 with any other meaning.
3461 However, honor the -fno-builtin option. */
3462 if (!flag_no_builtin)
3464 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3465 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3466 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3467 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3469 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3470 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3471 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3473 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3474 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3476 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3478 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3479 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3480 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3481 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3483 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3484 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3485 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3486 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3487 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3488 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3490 /* Declare these functions volatile
3491 to avoid spurious "control drops through" warnings. */
3492 /* Don't specify the argument types, to avoid errors
3493 from certain code which isn't valid in ANSI but which exists. */
3494 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3496 TREE_THIS_VOLATILE (temp) = 1;
3497 TREE_SIDE_EFFECTS (temp) = 1;
3498 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3499 TREE_THIS_VOLATILE (temp) = 1;
3500 TREE_SIDE_EFFECTS (temp) = 1;
3504 /* Support for these has not been written in either expand_builtin
3505 or build_function_call. */
3506 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3507 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3508 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3510 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3512 builtin_function ("__builtin_fmod", double_ftype_double_double,
3513 BUILT_IN_FMOD, NULL_PTR);
3514 builtin_function ("__builtin_frem", double_ftype_double_double,
3515 BUILT_IN_FREM, NULL_PTR);
3516 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3518 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3522 pedantic_lvalues = pedantic;
3524 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3525 declare_function_name ();
3527 start_identifier_warnings ();
3529 /* Prepare to check format strings against argument lists. */
3530 init_function_format_info ();
3534 incomplete_decl_finalize_hook = finish_incomplete_decl;
3536 lang_get_alias_set = c_get_alias_set;
3539 /* Return a definition for a builtin function named NAME and whose data type
3540 is TYPE. TYPE should be a function type with argument types.
3541 FUNCTION_CODE tells later passes how to compile calls to this function.
3542 See tree.h for its possible values.
3544 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3545 the name to be called if we can't opencode the function. */
3548 builtin_function (name, type, function_code, library_name)
3551 enum built_in_function function_code;
3554 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3555 DECL_EXTERNAL (decl) = 1;
3556 TREE_PUBLIC (decl) = 1;
3557 /* If -traditional, permit redefining a builtin function any way you like.
3558 (Though really, if the program redefines these functions,
3559 it probably won't work right unless compiled with -fno-builtin.) */
3560 if (flag_traditional && name[0] != '_')
3561 DECL_BUILT_IN_NONANSI (decl) = 1;
3563 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3564 make_decl_rtl (decl, NULL_PTR, 1);
3566 if (function_code != NOT_BUILT_IN)
3568 DECL_BUILT_IN (decl) = 1;
3569 DECL_FUNCTION_CODE (decl) = function_code;
3571 /* Warn if a function in the namespace for users
3572 is used without an occasion to consider it declared. */
3573 if (name[0] != '_' || name[1] != '_')
3574 C_DECL_ANTICIPATED (decl) = 1;
3579 /* Called when a declaration is seen that contains no names to declare.
3580 If its type is a reference to a structure, union or enum inherited
3581 from a containing scope, shadow that tag name for the current scope
3582 with a forward reference.
3583 If its type defines a new named structure or union
3584 or defines an enum, it is valid but we need not do anything here.
3585 Otherwise, it is an error. */
3588 shadow_tag (declspecs)
3591 shadow_tag_warned (declspecs, 0);
3595 shadow_tag_warned (declspecs, warned)
3598 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3605 pending_invalid_xref = 0;
3607 /* Remove the attributes from declspecs, since they will confuse the
3609 split_specs_attrs (declspecs, &specs, &attrs);
3611 for (link = specs; link; link = TREE_CHAIN (link))
3613 register tree value = TREE_VALUE (link);
3614 register enum tree_code code = TREE_CODE (value);
3616 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3617 /* Used to test also that TYPE_SIZE (value) != 0.
3618 That caused warning for `struct foo;' at top level in the file. */
3620 register tree name = lookup_tag_reverse (value);
3627 if (warned != 1 && code != ENUMERAL_TYPE)
3628 /* Empty unnamed enum OK */
3630 pedwarn ("unnamed struct/union that defines no instances");
3636 t = lookup_tag (code, name, current_binding_level, 1);
3640 t = make_node (code);
3647 if (!warned && ! in_system_header)
3649 warning ("useless keyword or type name in empty declaration");
3656 error ("two types specified in one empty declaration");
3661 pedwarn ("empty declaration");
3665 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3668 groktypename (typename)
3671 if (TREE_CODE (typename) != TREE_LIST)
3673 return grokdeclarator (TREE_VALUE (typename),
3674 TREE_PURPOSE (typename),
3678 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3681 groktypename_in_parm_context (typename)
3684 if (TREE_CODE (typename) != TREE_LIST)
3686 return grokdeclarator (TREE_VALUE (typename),
3687 TREE_PURPOSE (typename),
3691 /* Decode a declarator in an ordinary declaration or data definition.
3692 This is called as soon as the type information and variable name
3693 have been parsed, before parsing the initializer if any.
3694 Here we create the ..._DECL node, fill in its type,
3695 and put it on the list of decls for the current context.
3696 The ..._DECL node is returned as the value.
3698 Exception: for arrays where the length is not specified,
3699 the type is left null, to be filled in by `finish_decl'.
3701 Function definitions do not come here; they go to start_function
3702 instead. However, external and forward declarations of functions
3703 do go through here. Structure field declarations are done by
3704 grokfield and not through here. */
3706 /* Set this to zero to debug not using the temporary obstack
3707 to parse initializers. */
3708 int debug_temp_inits = 1;
3711 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3712 tree declarator, declspecs;
3714 tree attributes, prefix_attributes;
3716 register tree decl = grokdeclarator (declarator, declspecs,
3717 NORMAL, initialized);
3719 int init_written = initialized;
3721 /* The corresponding pop_obstacks is in finish_decl. */
3722 push_obstacks_nochange ();
3724 if (warn_main && TREE_CODE (decl) != FUNCTION_DECL
3725 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3726 warning_with_decl (decl, "`%s' is usually a function");
3729 /* Is it valid for this decl to have an initializer at all?
3730 If not, set INITIALIZED to zero, which will indirectly
3731 tell `finish_decl' to ignore the initializer once it is parsed. */
3732 switch (TREE_CODE (decl))
3735 /* typedef foo = bar means give foo the same type as bar.
3736 We haven't parsed bar yet, so `finish_decl' will fix that up.
3737 Any other case of an initialization in a TYPE_DECL is an error. */
3738 if (pedantic || list_length (declspecs) > 1)
3740 error ("typedef `%s' is initialized",
3741 IDENTIFIER_POINTER (DECL_NAME (decl)));
3747 error ("function `%s' is initialized like a variable",
3748 IDENTIFIER_POINTER (DECL_NAME (decl)));
3753 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3754 error ("parameter `%s' is initialized",
3755 IDENTIFIER_POINTER (DECL_NAME (decl)));
3760 /* Don't allow initializations for incomplete types
3761 except for arrays which might be completed by the initialization. */
3762 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3764 /* A complete type is ok if size is fixed. */
3766 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3767 || C_DECL_VARIABLE_SIZE (decl))
3769 error ("variable-sized object may not be initialized");
3773 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3775 error ("variable `%s' has initializer but incomplete type",
3776 IDENTIFIER_POINTER (DECL_NAME (decl)));
3779 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3781 error ("elements of array `%s' have incomplete type",
3782 IDENTIFIER_POINTER (DECL_NAME (decl)));
3789 #if 0 /* Seems redundant with grokdeclarator. */
3790 if (current_binding_level != global_binding_level
3791 && DECL_EXTERNAL (decl)
3792 && TREE_CODE (decl) != FUNCTION_DECL)
3793 warning ("declaration of `%s' has `extern' and is initialized",
3794 IDENTIFIER_POINTER (DECL_NAME (decl)));
3796 DECL_EXTERNAL (decl) = 0;
3797 if (current_binding_level == global_binding_level)
3798 TREE_STATIC (decl) = 1;
3800 /* Tell `pushdecl' this is an initialized decl
3801 even though we don't yet have the initializer expression.
3802 Also tell `finish_decl' it may store the real initializer. */
3803 DECL_INITIAL (decl) = error_mark_node;
3806 /* If this is a function declaration, write a record describing it to the
3807 prototypes file (if requested). */
3809 if (TREE_CODE (decl) == FUNCTION_DECL)
3810 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3812 /* ANSI specifies that a tentative definition which is not merged with
3813 a non-tentative definition behaves exactly like a definition with an
3814 initializer equal to zero. (Section 3.7.2)
3815 -fno-common gives strict ANSI behavior. Usually you don't want it.
3816 This matters only for variables with external linkage. */
3817 if (! flag_no_common || ! TREE_PUBLIC (decl))
3818 DECL_COMMON (decl) = 1;
3820 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3821 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3824 /* Set attributes here so if duplicate decl, will have proper attributes. */
3825 decl_attributes (decl, attributes, prefix_attributes);
3827 /* Add this decl to the current binding level.
3828 TEM may equal DECL or it may be a previous decl of the same name. */
3829 tem = pushdecl (decl);
3831 /* For a local variable, define the RTL now. */
3832 if (current_binding_level != global_binding_level
3833 /* But not if this is a duplicate decl
3834 and we preserved the rtl from the previous one
3835 (which may or may not happen). */
3836 && DECL_RTL (tem) == 0)
3838 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3840 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3841 && DECL_INITIAL (tem) != 0)
3847 /* When parsing and digesting the initializer,
3848 use temporary storage. Do this even if we will ignore the value. */
3849 if (current_binding_level == global_binding_level && debug_temp_inits)
3850 temporary_allocation ();
3856 /* Finish processing of a declaration;
3857 install its initial value.
3858 If the length of an array type is not known before,
3859 it must be determined now, from the initial value, or it is an error. */
3862 finish_decl (decl, init, asmspec_tree)
3866 register tree type = TREE_TYPE (decl);
3867 int was_incomplete = (DECL_SIZE (decl) == 0);
3868 int temporary = allocation_temporary_p ();
3871 /* If a name was specified, get the string. */
3873 asmspec = TREE_STRING_POINTER (asmspec_tree);
3875 /* If `start_decl' didn't like having an initialization, ignore it now. */
3877 if (init != 0 && DECL_INITIAL (decl) == 0)
3879 /* Don't crash if parm is initialized. */
3880 if (TREE_CODE (decl) == PARM_DECL)
3883 if (ITERATOR_P (decl))
3886 error_with_decl (decl, "iterator has no initial value");
3888 init = save_expr (init);
3893 if (TREE_CODE (decl) != TYPE_DECL)
3894 store_init_value (decl, init);
3897 /* typedef foo = bar; store the type of bar as the type of foo. */
3898 TREE_TYPE (decl) = TREE_TYPE (init);
3899 DECL_INITIAL (decl) = init = 0;
3903 /* Pop back to the obstack that is current for this binding level.
3904 This is because MAXINDEX, rtl, etc. to be made below
3905 must go in the permanent obstack. But don't discard the
3906 temporary data yet. */
3908 #if 0 /* pop_obstacks was near the end; this is what was here. */
3909 if (current_binding_level == global_binding_level && temporary)
3910 end_temporary_allocation ();
3913 /* Deduce size of array from initialization, if not already known */
3915 if (TREE_CODE (type) == ARRAY_TYPE
3916 && TYPE_DOMAIN (type) == 0
3917 && TREE_CODE (decl) != TYPE_DECL)
3920 = (TREE_STATIC (decl)
3921 /* Even if pedantic, an external linkage array
3922 may have incomplete type at first. */
3923 ? pedantic && !TREE_PUBLIC (decl)
3924 : !DECL_EXTERNAL (decl));
3926 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3928 /* Get the completed type made by complete_array_type. */
3929 type = TREE_TYPE (decl);
3932 error_with_decl (decl, "initializer fails to determine size of `%s'");
3937 error_with_decl (decl, "array size missing in `%s'");
3938 /* If a `static' var's size isn't known,
3939 make it extern as well as static, so it does not get
3941 If it is not `static', then do not mark extern;
3942 finish_incomplete_decl will give it a default size
3943 and it will get allocated. */
3944 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3945 DECL_EXTERNAL (decl) = 1;
3948 /* TYPE_MAX_VALUE is always one less than the number of elements
3949 in the array, because we start counting at zero. Therefore,
3950 warn only if the value is less than zero. */
3951 if (pedantic && TYPE_DOMAIN (type) != 0
3952 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3953 error_with_decl (decl, "zero or negative size array `%s'");
3955 layout_decl (decl, 0);
3958 if (TREE_CODE (decl) == VAR_DECL)
3960 if (DECL_SIZE (decl) == 0
3961 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3962 layout_decl (decl, 0);
3964 if (DECL_SIZE (decl) == 0
3965 && (TREE_STATIC (decl)
3967 /* A static variable with an incomplete type
3968 is an error if it is initialized.
3969 Also if it is not file scope.
3970 Otherwise, let it through, but if it is not `extern'
3971 then it may cause an error message later. */
3972 /* A duplicate_decls call could have changed an extern
3973 declaration into a file scope one. This can be detected
3974 by TREE_ASM_WRITTEN being set. */
3975 (DECL_INITIAL (decl) != 0
3976 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3978 /* An automatic variable with an incomplete type
3980 !DECL_EXTERNAL (decl)))
3982 error_with_decl (decl, "storage size of `%s' isn't known");
3983 TREE_TYPE (decl) = error_mark_node;
3986 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3987 && DECL_SIZE (decl) != 0)
3989 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3990 constant_expression_warning (DECL_SIZE (decl));
3992 error_with_decl (decl, "storage size of `%s' isn't constant");
3995 if (TREE_USED (type))
3996 TREE_USED (decl) = 1;
3999 /* If this is a function and an assembler name is specified, it isn't
4000 builtin any more. Also reset DECL_RTL so we can give it its new
4002 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4004 DECL_BUILT_IN (decl) = 0;
4005 DECL_RTL (decl) = 0;
4008 /* Output the assembler code and/or RTL code for variables and functions,
4009 unless the type is an undefined structure or union.
4010 If not, it will get done when the type is completed. */
4012 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4014 if ((flag_traditional || TREE_PERMANENT (decl))
4015 && allocation_temporary_p ())
4017 push_obstacks_nochange ();
4018 end_temporary_allocation ();
4019 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4020 maybe_objc_check_decl (decl);
4021 rest_of_decl_compilation (decl, asmspec,
4022 (DECL_CONTEXT (decl) == 0
4023 || TREE_ASM_WRITTEN (decl)),
4029 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4030 maybe_objc_check_decl (decl);
4031 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4034 if (DECL_CONTEXT (decl) != 0)
4036 /* Recompute the RTL of a local array now
4037 if it used to be an incomplete type. */
4039 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4041 /* If we used it already as memory, it must stay in memory. */
4042 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4043 /* If it's still incomplete now, no init will save it. */
4044 if (DECL_SIZE (decl) == 0)
4045 DECL_INITIAL (decl) = 0;
4048 /* Compute and store the initial value. */
4049 if (TREE_CODE (decl) != FUNCTION_DECL)
4050 expand_decl_init (decl);
4054 if (TREE_CODE (decl) == TYPE_DECL)
4056 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4057 maybe_objc_check_decl (decl);
4058 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4062 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4063 /* This test used to include TREE_PERMANENT, however, we have the same
4064 problem with initializers at the function level. Such initializers get
4065 saved until the end of the function on the momentary_obstack. */
4066 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4068 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4069 space with DECL_ARG_TYPE. */
4070 && TREE_CODE (decl) != PARM_DECL)
4072 /* We need to remember that this array HAD an initialization,
4073 but discard the actual temporary nodes,
4074 since we can't have a permanent node keep pointing to them. */
4075 /* We make an exception for inline functions, since it's
4076 normal for a local extern redeclaration of an inline function
4077 to have a copy of the top-level decl's DECL_INLINE. */
4078 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4080 /* If this is a const variable, then preserve the
4081 initializer instead of discarding it so that we can optimize
4082 references to it. */
4083 /* This test used to include TREE_STATIC, but this won't be set
4084 for function level initializers. */
4085 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4087 preserve_initializer ();
4088 /* Hack? Set the permanent bit for something that is permanent,
4089 but not on the permanent obstack, so as to convince
4090 output_constant_def to make its rtl on the permanent
4092 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4094 /* The initializer and DECL must have the same (or equivalent
4095 types), but if the initializer is a STRING_CST, its type
4096 might not be on the right obstack, so copy the type
4098 TREE_TYPE (DECL_INITIAL (decl)) = type;
4101 DECL_INITIAL (decl) = error_mark_node;
4105 /* If requested, warn about definitions of large data objects. */
4107 if (warn_larger_than
4108 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4109 && !DECL_EXTERNAL (decl))
4111 register tree decl_size = DECL_SIZE (decl);
4113 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4115 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4117 if (units > larger_than_size)
4118 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4123 /* Resume permanent allocation, if not within a function. */
4124 /* The corresponding push_obstacks_nochange is in start_decl,
4125 and in push_parm_decl and in grokfield. */
4129 /* If we have gone back from temporary to permanent allocation,
4130 actually free the temporary space that we no longer need. */
4131 if (temporary && !allocation_temporary_p ())
4132 permanent_allocation (0);
4134 /* At the end of a declaration, throw away any variable type sizes
4135 of types defined inside that declaration. There is no use
4136 computing them in the following function definition. */
4137 if (current_binding_level == global_binding_level)
4138 get_pending_sizes ();
4141 /* If DECL has a cleanup, build and return that cleanup here.
4142 This is a callback called by expand_expr. */
4145 maybe_build_cleanup (decl)
4146 tree decl ATTRIBUTE_UNUSED;
4148 /* There are no cleanups in C. */
4152 /* Given a parsed parameter declaration,
4153 decode it into a PARM_DECL and push that on the current binding level.
4154 Also, for the sake of forward parm decls,
4155 record the given order of parms in `parm_order'. */
4158 push_parm_decl (parm)
4162 int old_immediate_size_expand = immediate_size_expand;
4163 /* Don't try computing parm sizes now -- wait till fn is called. */
4164 immediate_size_expand = 0;
4166 /* The corresponding pop_obstacks is in finish_decl. */
4167 push_obstacks_nochange ();
4169 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4170 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4171 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4172 TREE_PURPOSE (TREE_VALUE (parm)));
4175 if (DECL_NAME (decl))
4178 olddecl = lookup_name (DECL_NAME (decl));
4179 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4180 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4184 decl = pushdecl (decl);
4186 immediate_size_expand = old_immediate_size_expand;
4188 current_binding_level->parm_order
4189 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4191 /* Add this decl to the current binding level. */
4192 finish_decl (decl, NULL_TREE, NULL_TREE);
4195 /* Clear the given order of parms in `parm_order'.
4196 Used at start of parm list,
4197 and also at semicolon terminating forward decls. */
4202 current_binding_level->parm_order = NULL_TREE;
4205 /* Make TYPE a complete type based on INITIAL_VALUE.
4206 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4207 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4210 complete_array_type (type, initial_value, do_default)
4215 register tree maxindex = NULL_TREE;
4220 /* Note MAXINDEX is really the maximum index,
4221 one less than the size. */
4222 if (TREE_CODE (initial_value) == STRING_CST)
4225 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4226 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4229 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4231 tree elts = CONSTRUCTOR_ELTS (initial_value);
4232 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4233 for (; elts; elts = TREE_CHAIN (elts))
4235 if (TREE_PURPOSE (elts))
4236 maxindex = TREE_PURPOSE (elts);
4238 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4240 maxindex = copy_node (maxindex);
4244 /* Make an error message unless that happened already. */
4245 if (initial_value != error_mark_node)
4248 /* Prevent further error messages. */
4249 maxindex = build_int_2 (0, 0);
4256 maxindex = build_int_2 (0, 0);
4262 TYPE_DOMAIN (type) = build_index_type (maxindex);
4263 if (!TREE_TYPE (maxindex))
4264 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4267 /* Lay out the type now that we can get the real answer. */
4274 /* Given declspecs and a declarator,
4275 determine the name and type of the object declared
4276 and construct a ..._DECL node for it.
4277 (In one case we can return a ..._TYPE node instead.
4278 For invalid input we sometimes return 0.)
4280 DECLSPECS is a chain of tree_list nodes whose value fields
4281 are the storage classes and type specifiers.
4283 DECL_CONTEXT says which syntactic context this declaration is in:
4284 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4285 FUNCDEF for a function definition. Like NORMAL but a few different
4286 error messages in each case. Return value may be zero meaning
4287 this definition is too screwy to try to parse.
4288 PARM for a parameter declaration (either within a function prototype
4289 or before a function body). Make a PARM_DECL, or return void_type_node.
4290 TYPENAME if for a typename (in a cast or sizeof).
4291 Don't make a DECL node; just return the ..._TYPE node.
4292 FIELD for a struct or union field; make a FIELD_DECL.
4293 BITFIELD for a field with specified width.
4294 INITIALIZED is 1 if the decl has an initializer.
4296 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4297 It may also be so in the PARM case, for a prototype where the
4298 argument type is specified but not the name.
4300 This function is where the complicated C meanings of `static'
4301 and `extern' are interpreted. */
4304 grokdeclarator (declarator, declspecs, decl_context, initialized)
4307 enum decl_context decl_context;
4312 tree type = NULL_TREE;
4317 int explicit_int = 0;
4318 int explicit_char = 0;
4319 int defaulted_int = 0;
4320 tree typedef_decl = 0;
4322 tree typedef_type = 0;
4323 int funcdef_flag = 0;
4324 enum tree_code innermost_code = ERROR_MARK;
4326 int size_varies = 0;
4327 tree decl_machine_attr = NULL_TREE;
4329 if (decl_context == BITFIELD)
4330 bitfield = 1, decl_context = FIELD;
4332 if (decl_context == FUNCDEF)
4333 funcdef_flag = 1, decl_context = NORMAL;
4335 push_obstacks_nochange ();
4337 if (flag_traditional && allocation_temporary_p ())
4338 end_temporary_allocation ();
4340 /* Look inside a declarator for the name being declared
4341 and get it as a string, for an error message. */
4343 register tree decl = declarator;
4347 switch (TREE_CODE (decl))
4352 innermost_code = TREE_CODE (decl);
4353 decl = TREE_OPERAND (decl, 0);
4356 case IDENTIFIER_NODE:
4357 name = IDENTIFIER_POINTER (decl);
4368 /* A function definition's declarator must have the form of
4369 a function declarator. */
4371 if (funcdef_flag && innermost_code != CALL_EXPR)
4374 /* Anything declared one level down from the top level
4375 must be one of the parameters of a function
4376 (because the body is at least two levels down). */
4378 /* If this looks like a function definition, make it one,
4379 even if it occurs where parms are expected.
4380 Then store_parm_decls will reject it and not use it as a parm. */
4381 if (decl_context == NORMAL && !funcdef_flag
4382 && current_binding_level->parm_flag)
4383 decl_context = PARM;
4385 /* Look through the decl specs and record which ones appear.
4386 Some typespecs are defined as built-in typenames.
4387 Others, the ones that are modifiers of other types,
4388 are represented by bits in SPECBITS: set the bits for
4389 the modifiers that appear. Storage class keywords are also in SPECBITS.
4391 If there is a typedef name or a type, store the type in TYPE.
4392 This includes builtin typedefs such as `int'.
4394 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4395 and did not come from a user typedef.
4397 Set LONGLONG if `long' is mentioned twice. */
4399 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4402 register tree id = TREE_VALUE (spec);
4404 if (id == ridpointers[(int) RID_INT])
4406 if (id == ridpointers[(int) RID_CHAR])
4409 if (TREE_CODE (id) == IDENTIFIER_NODE)
4410 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4412 if (ridpointers[i] == id)
4414 if (i == (int) RID_LONG && specbits & (1<<i))
4417 error ("`long long long' is too long for GCC");
4420 if (pedantic && ! in_system_header && warn_long_long)
4421 pedwarn ("ANSI C does not support `long long'");
4425 else if (specbits & (1 << i))
4426 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4432 error ("two or more data types in declaration of `%s'", name);
4433 /* Actual typedefs come to us as TYPE_DECL nodes. */
4434 else if (TREE_CODE (id) == TYPE_DECL)
4436 type = TREE_TYPE (id);
4437 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4440 /* Built-in types come as identifiers. */
4441 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4443 register tree t = lookup_name (id);
4444 if (TREE_TYPE (t) == error_mark_node)
4446 else if (!t || TREE_CODE (t) != TYPE_DECL)
4447 error ("`%s' fails to be a typedef or built in type",
4448 IDENTIFIER_POINTER (id));
4451 type = TREE_TYPE (t);
4455 else if (TREE_CODE (id) != ERROR_MARK)
4461 typedef_type = type;
4463 size_varies = C_TYPE_VARIABLE_SIZE (type);
4465 /* No type at all: default to `int', and set DEFAULTED_INT
4466 because it was not a user-defined typedef. */
4470 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4471 | (1 << (int) RID_SIGNED)
4472 | (1 << (int) RID_UNSIGNED))))
4473 /* Don't warn about typedef foo = bar. */
4474 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4475 && ! (in_system_header && ! allocation_temporary_p ()))
4477 /* C9x will probably require a diagnostic here.
4478 For now, issue a warning if -Wreturn-type and this is a function,
4479 or if -Wimplicit; prefer the former warning since it is more
4481 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4482 warn_about_return_type = 1;
4483 else if (warn_implicit_int)
4484 warning ("type defaults to `int' in declaration of `%s'", name);
4488 type = integer_type_node;
4491 /* Now process the modifiers that were specified
4492 and check for invalid combinations. */
4494 /* Long double is a special combination. */
4496 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4497 && TYPE_MAIN_VARIANT (type) == double_type_node)
4499 specbits &= ~ (1 << (int) RID_LONG);
4500 type = long_double_type_node;
4503 /* Check all other uses of type modifiers. */
4505 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4506 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4510 if ((specbits & 1 << (int) RID_LONG)
4511 && (specbits & 1 << (int) RID_SHORT))
4512 error ("both long and short specified for `%s'", name);
4513 else if (((specbits & 1 << (int) RID_LONG)
4514 || (specbits & 1 << (int) RID_SHORT))
4516 error ("long or short specified with char for `%s'", name);
4517 else if (((specbits & 1 << (int) RID_LONG)
4518 || (specbits & 1 << (int) RID_SHORT))
4519 && TREE_CODE (type) == REAL_TYPE)
4521 static int already = 0;
4523 error ("long or short specified with floating type for `%s'", name);
4524 if (! already && ! pedantic)
4526 error ("the only valid combination is `long double'");
4530 else if ((specbits & 1 << (int) RID_SIGNED)
4531 && (specbits & 1 << (int) RID_UNSIGNED))
4532 error ("both signed and unsigned specified for `%s'", name);
4533 else if (TREE_CODE (type) != INTEGER_TYPE)
4534 error ("long, short, signed or unsigned invalid for `%s'", name);
4538 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4540 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4542 if (flag_pedantic_errors)
4547 /* Discard the type modifiers if they are invalid. */
4550 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4551 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4556 if ((specbits & (1 << (int) RID_COMPLEX))
4557 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4559 error ("complex invalid for `%s'", name);
4560 specbits &= ~ (1 << (int) RID_COMPLEX);
4563 /* Decide whether an integer type is signed or not.
4564 Optionally treat bitfields as signed by default. */
4565 if (specbits & 1 << (int) RID_UNSIGNED
4566 /* Traditionally, all bitfields are unsigned. */
4567 || (bitfield && flag_traditional
4568 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4569 || (bitfield && ! flag_signed_bitfields
4570 && (explicit_int || defaulted_int || explicit_char
4571 /* A typedef for plain `int' without `signed'
4572 can be controlled just like plain `int'. */
4573 || ! (typedef_decl != 0
4574 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4575 && TREE_CODE (type) != ENUMERAL_TYPE
4576 && !(specbits & 1 << (int) RID_SIGNED)))
4579 type = long_long_unsigned_type_node;
4580 else if (specbits & 1 << (int) RID_LONG)
4581 type = long_unsigned_type_node;
4582 else if (specbits & 1 << (int) RID_SHORT)
4583 type = short_unsigned_type_node;
4584 else if (type == char_type_node)
4585 type = unsigned_char_type_node;
4586 else if (typedef_decl)
4587 type = unsigned_type (type);
4589 type = unsigned_type_node;
4591 else if ((specbits & 1 << (int) RID_SIGNED)
4592 && type == char_type_node)
4593 type = signed_char_type_node;
4595 type = long_long_integer_type_node;
4596 else if (specbits & 1 << (int) RID_LONG)
4597 type = long_integer_type_node;
4598 else if (specbits & 1 << (int) RID_SHORT)
4599 type = short_integer_type_node;
4601 if (specbits & 1 << (int) RID_COMPLEX)
4603 /* If we just have "complex", it is equivalent to
4604 "complex double", but if any modifiers at all are specified it is
4605 the complex form of TYPE. E.g, "complex short" is
4606 "complex short int". */
4608 if (defaulted_int && ! longlong
4609 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4610 | (1 << (int) RID_SIGNED)
4611 | (1 << (int) RID_UNSIGNED))))
4612 type = complex_double_type_node;
4613 else if (type == integer_type_node)
4614 type = complex_integer_type_node;
4615 else if (type == float_type_node)
4616 type = complex_float_type_node;
4617 else if (type == double_type_node)
4618 type = complex_double_type_node;
4619 else if (type == long_double_type_node)
4620 type = complex_long_double_type_node;
4622 type = build_complex_type (type);
4625 /* Set CONSTP if this declaration is `const', whether by
4626 explicit specification or via a typedef.
4627 Likewise for VOLATILEP. */
4629 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4630 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4631 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4633 pedwarn ("duplicate `const'");
4635 pedwarn ("duplicate `volatile'");
4636 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4637 type = TYPE_MAIN_VARIANT (type);
4639 /* Warn if two storage classes are given. Default to `auto'. */
4644 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4645 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4646 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4647 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4648 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4649 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4651 /* Warn about storage classes that are invalid for certain
4652 kinds of declarations (parameters, typenames, etc.). */
4655 error ("multiple storage classes in declaration of `%s'", name);
4656 else if (funcdef_flag
4658 & ((1 << (int) RID_REGISTER)
4659 | (1 << (int) RID_AUTO)
4660 | (1 << (int) RID_TYPEDEF))))
4662 if (specbits & 1 << (int) RID_AUTO
4663 && (pedantic || current_binding_level == global_binding_level))
4664 pedwarn ("function definition declared `auto'");
4665 if (specbits & 1 << (int) RID_REGISTER)
4666 error ("function definition declared `register'");
4667 if (specbits & 1 << (int) RID_TYPEDEF)
4668 error ("function definition declared `typedef'");
4669 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4670 | (1 << (int) RID_AUTO));
4672 else if (decl_context != NORMAL && nclasses > 0)
4674 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4678 error ((decl_context == FIELD
4679 ? "storage class specified for structure field `%s'"
4680 : (decl_context == PARM
4681 ? "storage class specified for parameter `%s'"
4682 : "storage class specified for typename")),
4684 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4685 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4686 | (1 << (int) RID_EXTERN));
4689 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4691 /* `extern' with initialization is invalid if not at top level. */
4692 if (current_binding_level == global_binding_level)
4693 warning ("`%s' initialized and declared `extern'", name);
4695 error ("`%s' has both `extern' and initializer", name);
4697 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4698 && current_binding_level != global_binding_level)
4699 error ("nested function `%s' declared `extern'", name);
4700 else if (current_binding_level == global_binding_level
4701 && specbits & (1 << (int) RID_AUTO))
4702 error ("top-level declaration of `%s' specifies `auto'", name);
4703 else if ((specbits & 1 << (int) RID_ITERATOR)
4704 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4706 error ("iterator `%s' has derived type", name);
4707 type = error_mark_node;
4709 else if ((specbits & 1 << (int) RID_ITERATOR)
4710 && TREE_CODE (type) != INTEGER_TYPE)
4712 error ("iterator `%s' has noninteger type", name);
4713 type = error_mark_node;
4717 /* Now figure out the structure of the declarator proper.
4718 Descend through it, creating more complex types, until we reach
4719 the declared identifier (or NULL_TREE, in an absolute declarator). */
4721 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4723 if (type == error_mark_node)
4725 declarator = TREE_OPERAND (declarator, 0);
4729 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4730 an INDIRECT_REF (for *...),
4731 a CALL_EXPR (for ...(...)),
4732 an identifier (for the name being declared)
4733 or a null pointer (for the place in an absolute declarator
4734 where the name was omitted).
4735 For the last two cases, we have just exited the loop.
4737 At this point, TYPE is the type of elements of an array,
4738 or for a function to return, or for a pointer to point to.
4739 After this sequence of ifs, TYPE is the type of the
4740 array or function or pointer, and DECLARATOR has had its
4741 outermost layer removed. */
4743 if (TREE_CODE (declarator) == ARRAY_REF)
4745 register tree itype = NULL_TREE;
4746 register tree size = TREE_OPERAND (declarator, 1);
4747 /* An uninitialized decl with `extern' is a reference. */
4748 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4749 /* The index is a signed object `sizetype' bits wide. */
4750 tree index_type = signed_type (sizetype);
4752 declarator = TREE_OPERAND (declarator, 0);
4754 /* Check for some types that there cannot be arrays of. */
4756 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4758 error ("declaration of `%s' as array of voids", name);
4759 type = error_mark_node;
4762 if (TREE_CODE (type) == FUNCTION_TYPE)
4764 error ("declaration of `%s' as array of functions", name);
4765 type = error_mark_node;
4768 if (size == error_mark_node)
4769 type = error_mark_node;
4771 if (type == error_mark_node)
4774 /* If this is a block level extern, it must live past the end
4775 of the function so that we can check it against other extern
4776 declarations (IDENTIFIER_LIMBO_VALUE). */
4777 if (extern_ref && allocation_temporary_p ())
4778 end_temporary_allocation ();
4780 /* If size was specified, set ITYPE to a range-type for that size.
4781 Otherwise, ITYPE remains null. finish_decl may figure it out
4782 from an initial value. */
4786 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4787 STRIP_TYPE_NOPS (size);
4789 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4790 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4792 error ("size of array `%s' has non-integer type", name);
4793 size = integer_one_node;
4796 if (pedantic && integer_zerop (size))
4797 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4799 if (TREE_CODE (size) == INTEGER_CST)
4801 constant_expression_warning (size);
4802 if (tree_int_cst_sgn (size) < 0)
4804 error ("size of array `%s' is negative", name);
4805 size = integer_one_node;
4810 /* Make sure the array size remains visibly nonconstant
4811 even if it is (eg) a const variable with known value. */
4816 if (TREE_CONSTANT (size))
4817 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4819 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4823 /* Convert size to index_type, so that if it is a variable
4824 the computations will be done in the proper mode. */
4825 itype = fold (build (MINUS_EXPR, index_type,
4826 convert (index_type, size),
4827 convert (index_type, size_one_node)));
4829 /* If that overflowed, the array is too big.
4830 ??? While a size of INT_MAX+1 technically shouldn't cause
4831 an overflow (because we subtract 1), the overflow is recorded
4832 during the conversion to index_type, before the subtraction.
4833 Handling this case seems like an unnecessary complication. */
4834 if (TREE_OVERFLOW (itype))
4836 error ("size of array `%s' is too large", name);
4837 type = error_mark_node;
4842 itype = variable_size (itype);
4843 itype = build_index_type (itype);
4846 #if 0 /* This had bad results for pointers to arrays, as in
4847 union incomplete (*foo)[4]; */
4848 /* Complain about arrays of incomplete types, except in typedefs. */
4850 if (TYPE_SIZE (type) == 0
4851 /* Avoid multiple warnings for nested array types. */
4852 && TREE_CODE (type) != ARRAY_TYPE
4853 && !(specbits & (1 << (int) RID_TYPEDEF))
4854 && !C_TYPE_BEING_DEFINED (type))
4855 warning ("array type has incomplete element type");
4858 #if 0 /* We shouldn't have a function type here at all!
4859 Functions aren't allowed as array elements. */
4860 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4861 && (constp || volatilep))
4862 pedwarn ("ANSI C forbids const or volatile function types");
4865 /* Build the array type itself, then merge any constancy or
4866 volatility into the target type. We must do it in this order
4867 to ensure that the TYPE_MAIN_VARIANT field of the array type
4868 is set correctly. */
4870 type = build_array_type (type, itype);
4871 if (constp || volatilep)
4872 type = c_build_type_variant (type, constp, volatilep);
4874 #if 0 /* don't clear these; leave them set so that the array type
4875 or the variable is itself const or volatile. */
4881 C_TYPE_VARIABLE_SIZE (type) = 1;
4883 else if (TREE_CODE (declarator) == CALL_EXPR)
4885 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4886 || current_binding_level == global_binding_level);
4889 /* Declaring a function type.
4890 Make sure we have a valid type for the function to return. */
4891 if (type == error_mark_node)
4896 /* Warn about some types functions can't return. */
4898 if (TREE_CODE (type) == FUNCTION_TYPE)
4900 error ("`%s' declared as function returning a function", name);
4901 type = integer_type_node;
4903 if (TREE_CODE (type) == ARRAY_TYPE)
4905 error ("`%s' declared as function returning an array", name);
4906 type = integer_type_node;
4909 #ifndef TRADITIONAL_RETURN_FLOAT
4910 /* Traditionally, declaring return type float means double. */
4912 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4913 type = double_type_node;
4914 #endif /* TRADITIONAL_RETURN_FLOAT */
4916 /* If this is a block level extern, it must live past the end
4917 of the function so that we can check it against other extern
4918 declarations (IDENTIFIER_LIMBO_VALUE). */
4919 if (extern_ref && allocation_temporary_p ())
4920 end_temporary_allocation ();
4922 /* Construct the function type and go to the next
4923 inner layer of declarator. */
4925 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4927 /* Say it's a definition
4928 only for the CALL_EXPR
4929 closest to the identifier. */
4930 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4931 #if 0 /* This seems to be false. We turn off temporary allocation
4932 above in this function if -traditional.
4933 And this code caused inconsistent results with prototypes:
4934 callers would ignore them, and pass arguments wrong. */
4936 /* Omit the arg types if -traditional, since the arg types
4937 and the list links might not be permanent. */
4938 type = build_function_type (type,
4940 ? NULL_TREE : arg_types);
4942 /* ANSI seems to say that `const int foo ();'
4943 does not make the function foo const. */
4944 if (constp || volatilep)
4945 type = c_build_type_variant (type, constp, volatilep);
4949 type = build_function_type (type, arg_types);
4950 declarator = TREE_OPERAND (declarator, 0);
4952 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4953 the formal parameter list of this FUNCTION_TYPE to point to
4954 the FUNCTION_TYPE node itself. */
4959 for (link = last_function_parm_tags;
4961 link = TREE_CHAIN (link))
4962 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4965 else if (TREE_CODE (declarator) == INDIRECT_REF)
4967 /* Merge any constancy or volatility into the target type
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);
4979 type = build_pointer_type (type);
4981 /* Process a list of type modifier keywords
4982 (such as const or volatile) that were given inside the `*'. */
4984 if (TREE_TYPE (declarator))
4986 register tree typemodlist;
4988 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4989 typemodlist = TREE_CHAIN (typemodlist))
4991 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4993 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4998 error ("invalid type modifier within pointer declarator");
5002 pedwarn ("duplicate `const'");
5004 pedwarn ("duplicate `volatile'");
5007 declarator = TREE_OPERAND (declarator, 0);
5014 /* Now TYPE has the actual type. */
5016 /* Did array size calculations overflow? */
5018 if (TREE_CODE (type) == ARRAY_TYPE
5020 && TREE_OVERFLOW (TYPE_SIZE (type)))
5021 error ("size of array `%s' is too large", name);
5023 /* If this is declaring a typedef name, return a TYPE_DECL. */
5025 if (specbits & (1 << (int) RID_TYPEDEF))
5028 /* Note that the grammar rejects storage classes
5029 in typenames, fields or parameters */
5030 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5031 && (constp || volatilep))
5032 pedwarn ("ANSI C forbids const or volatile function types");
5033 if (constp || volatilep)
5034 type = c_build_type_variant (type, constp, volatilep);
5035 decl = build_decl (TYPE_DECL, declarator, type);
5036 if ((specbits & (1 << (int) RID_SIGNED))
5037 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5038 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5043 /* Detect the case of an array type of unspecified size
5044 which came, as such, direct from a typedef name.
5045 We must copy the type, so that each identifier gets
5046 a distinct type, so that each identifier's size can be
5047 controlled separately by its own initializer. */
5049 if (type != 0 && typedef_type != 0
5050 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5051 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5053 type = build_array_type (TREE_TYPE (type), 0);
5055 C_TYPE_VARIABLE_SIZE (type) = 1;
5058 /* If this is a type name (such as, in a cast or sizeof),
5059 compute the type and return it now. */
5061 if (decl_context == TYPENAME)
5063 /* Note that the grammar rejects storage classes
5064 in typenames, fields or parameters */
5065 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5066 && (constp || volatilep))
5067 pedwarn ("ANSI C forbids const or volatile function types");
5068 if (constp || volatilep)
5069 type = c_build_type_variant (type, constp, volatilep);
5074 /* Aside from typedefs and type names (handle above),
5075 `void' at top level (not within pointer)
5076 is allowed only in public variables.
5077 We don't complain about parms either, but that is because
5078 a better error message can be made later. */
5080 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5081 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5082 && ((specbits & (1 << (int) RID_EXTERN))
5083 || (current_binding_level == global_binding_level
5085 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5087 error ("variable or field `%s' declared void", name);
5088 type = integer_type_node;
5091 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5092 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5097 if (decl_context == PARM)
5099 tree type_as_written = type;
5102 /* A parameter declared as an array of T is really a pointer to T.
5103 One declared as a function is really a pointer to a function. */
5105 if (TREE_CODE (type) == ARRAY_TYPE)
5107 /* Transfer const-ness of array into that of type pointed to. */
5108 type = TREE_TYPE (type);
5109 if (constp || volatilep)
5110 type = c_build_type_variant (type, constp, volatilep);
5111 type = build_pointer_type (type);
5112 volatilep = constp = 0;
5115 else if (TREE_CODE (type) == FUNCTION_TYPE)
5117 if (pedantic && (constp || volatilep))
5118 pedwarn ("ANSI C forbids const or volatile function types");
5119 if (constp || volatilep)
5120 type = c_build_type_variant (type, constp, volatilep);
5121 type = build_pointer_type (type);
5122 volatilep = constp = 0;
5125 decl = build_decl (PARM_DECL, declarator, type);
5127 C_DECL_VARIABLE_SIZE (decl) = 1;
5129 /* Compute the type actually passed in the parmlist,
5130 for the case where there is no prototype.
5131 (For example, shorts and chars are passed as ints.)
5132 When there is a prototype, this is overridden later. */
5134 DECL_ARG_TYPE (decl) = type;
5135 main_type = (type == error_mark_node
5137 : TYPE_MAIN_VARIANT (type));
5138 if (main_type == float_type_node)
5139 DECL_ARG_TYPE (decl) = double_type_node;
5140 /* Don't use TYPE_PRECISION to decide whether to promote,
5141 because we should convert short if it's the same size as int,
5142 but we should not convert long if it's the same size as int. */
5143 else if (TREE_CODE (main_type) != ERROR_MARK
5144 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5146 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5147 && TREE_UNSIGNED (type))
5148 DECL_ARG_TYPE (decl) = unsigned_type_node;
5150 DECL_ARG_TYPE (decl) = integer_type_node;
5153 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5155 else if (decl_context == FIELD)
5157 /* Structure field. It may not be a function. */
5159 if (TREE_CODE (type) == FUNCTION_TYPE)
5161 error ("field `%s' declared as a function", name);
5162 type = build_pointer_type (type);
5164 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5166 error ("field `%s' has incomplete type", name);
5167 type = error_mark_node;
5169 /* Move type qualifiers down to element of an array. */
5170 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5172 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5174 TYPE_DOMAIN (type));
5175 #if 0 /* Leave the field const or volatile as well. */
5176 constp = volatilep = 0;
5179 decl = build_decl (FIELD_DECL, declarator, type);
5181 C_DECL_VARIABLE_SIZE (decl) = 1;
5183 else if (TREE_CODE (type) == FUNCTION_TYPE)
5185 /* Every function declaration is "external"
5186 except for those which are inside a function body
5187 in which `auto' is used.
5188 That is a case not specified by ANSI C,
5189 and we use it for forward declarations for nested functions. */
5190 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5191 || current_binding_level == global_binding_level);
5193 if (specbits & (1 << (int) RID_AUTO)
5194 && (pedantic || current_binding_level == global_binding_level))
5195 pedwarn ("invalid storage class for function `%s'", name);
5196 if (specbits & (1 << (int) RID_REGISTER))
5197 error ("invalid storage class for function `%s'", name);
5198 /* Function declaration not at top level.
5199 Storage classes other than `extern' are not allowed
5200 and `extern' makes no difference. */
5201 if (current_binding_level != global_binding_level
5202 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5204 pedwarn ("invalid storage class for function `%s'", name);
5206 /* If this is a block level extern, it must live past the end
5207 of the function so that we can check it against other
5208 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5209 if (extern_ref && allocation_temporary_p ())
5210 end_temporary_allocation ();
5212 decl = build_decl (FUNCTION_DECL, declarator, type);
5213 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5215 if (pedantic && (constp || volatilep)
5216 && ! DECL_IN_SYSTEM_HEADER (decl))
5217 pedwarn ("ANSI C forbids const or volatile functions");
5220 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5221 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5222 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5223 && ! DECL_IN_SYSTEM_HEADER (decl))
5224 pedwarn ("ANSI C forbids const or volatile void function return type");
5227 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5228 warning ("`noreturn' function returns non-void value");
5231 DECL_EXTERNAL (decl) = 1;
5232 /* Record absence of global scope for `static' or `auto'. */
5234 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5236 /* Record presence of `inline', if it is reasonable. */
5239 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5240 warning ("cannot inline function `main'");
5242 /* Assume that otherwise the function can be inlined. */
5243 DECL_INLINE (decl) = 1;
5245 if (specbits & (1 << (int) RID_EXTERN))
5246 current_extern_inline = 1;
5251 /* It's a variable. */
5252 /* An uninitialized decl with `extern' is a reference. */
5253 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5255 /* Move type qualifiers down to element of an array. */
5256 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5258 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5260 TYPE_DOMAIN (type));
5261 #if 0 /* Leave the variable const or volatile as well. */
5262 constp = volatilep = 0;
5266 /* If this is a block level extern, it must live past the end
5267 of the function so that we can check it against other
5268 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5269 if (extern_ref && allocation_temporary_p ())
5270 end_temporary_allocation ();
5272 decl = build_decl (VAR_DECL, declarator, type);
5274 C_DECL_VARIABLE_SIZE (decl) = 1;
5277 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5279 DECL_EXTERNAL (decl) = extern_ref;
5280 /* At top level, the presence of a `static' or `register' storage
5281 class specifier, or the absence of all storage class specifiers
5282 makes this declaration a definition (perhaps tentative). Also,
5283 the absence of both `static' and `register' makes it public. */
5284 if (current_binding_level == global_binding_level)
5288 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5289 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5291 /* Not at top level, only `static' makes a static definition. */
5294 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5295 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5298 if (specbits & 1 << (int) RID_ITERATOR)
5299 ITERATOR_P (decl) = 1;
5302 /* Record `register' declaration for warnings on &
5303 and in case doing stupid register allocation. */
5305 if (specbits & (1 << (int) RID_REGISTER))
5306 DECL_REGISTER (decl) = 1;
5308 /* Record constancy and volatility. */
5311 TREE_READONLY (decl) = 1;
5314 TREE_SIDE_EFFECTS (decl) = 1;
5315 TREE_THIS_VOLATILE (decl) = 1;
5317 /* If a type has volatile components, it should be stored in memory.
5318 Otherwise, the fact that those components are volatile
5319 will be ignored, and would even crash the compiler. */
5320 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5321 mark_addressable (decl);
5329 /* Decode the parameter-list info for a function type or function definition.
5330 The argument is the value returned by `get_parm_info' (or made in parse.y
5331 if there is an identifier list instead of a parameter decl list).
5332 These two functions are separate because when a function returns
5333 or receives functions then each is called multiple times but the order
5334 of calls is different. The last call to `grokparms' is always the one
5335 that contains the formal parameter names of a function definition.
5337 Store in `last_function_parms' a chain of the decls of parms.
5338 Also store in `last_function_parm_tags' a chain of the struct, union,
5339 and enum tags declared among the parms.
5341 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5343 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5344 a mere declaration. A nonempty identifier-list gets an error message
5345 when FUNCDEF_FLAG is zero. */
5348 grokparms (parms_info, funcdef_flag)
5352 tree first_parm = TREE_CHAIN (parms_info);
5354 last_function_parms = TREE_PURPOSE (parms_info);
5355 last_function_parm_tags = TREE_VALUE (parms_info);
5357 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5358 && !in_system_header)
5359 warning ("function declaration isn't a prototype");
5362 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5365 pedwarn ("parameter names (without types) in function declaration");
5367 last_function_parms = first_parm;
5374 /* We no longer test FUNCDEF_FLAG.
5375 If the arg types are incomplete in a declaration,
5376 they must include undefined tags.
5377 These tags can never be defined in the scope of the declaration,
5378 so the types can never be completed,
5379 and no call can be compiled successfully. */
5381 /* In a fcn definition, arg types must be complete. */
5384 for (parm = last_function_parms, typelt = first_parm;
5386 parm = TREE_CHAIN (parm))
5387 /* Skip over any enumeration constants declared here. */
5388 if (TREE_CODE (parm) == PARM_DECL)
5390 /* Barf if the parameter itself has an incomplete type. */
5391 tree type = TREE_VALUE (typelt);
5392 if (TYPE_SIZE (type) == 0)
5394 if (funcdef_flag && DECL_NAME (parm) != 0)
5395 error ("parameter `%s' has incomplete type",
5396 IDENTIFIER_POINTER (DECL_NAME (parm)));
5398 warning ("parameter has incomplete type");
5401 TREE_VALUE (typelt) = error_mark_node;
5402 TREE_TYPE (parm) = error_mark_node;
5405 #if 0 /* This has been replaced by parm_tags_warning
5406 which uses a more accurate criterion for what to warn about. */
5409 /* Now warn if is a pointer to an incomplete type. */
5410 while (TREE_CODE (type) == POINTER_TYPE
5411 || TREE_CODE (type) == REFERENCE_TYPE)
5412 type = TREE_TYPE (type);
5413 type = TYPE_MAIN_VARIANT (type);
5414 if (TYPE_SIZE (type) == 0)
5416 if (DECL_NAME (parm) != 0)
5417 warning ("parameter `%s' points to incomplete type",
5418 IDENTIFIER_POINTER (DECL_NAME (parm)));
5420 warning ("parameter points to incomplete type");
5424 typelt = TREE_CHAIN (typelt);
5427 /* Allocate the list of types the way we allocate a type. */
5428 if (first_parm && ! TREE_PERMANENT (first_parm))
5430 /* Construct a copy of the list of types
5431 on the saveable obstack. */
5433 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5434 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5436 return nreverse (result);
5439 /* The list we have is permanent already. */
5445 /* Return a tree_list node with info on a parameter list just parsed.
5446 The TREE_PURPOSE is a chain of decls of those parms.
5447 The TREE_VALUE is a list of structure, union and enum tags defined.
5448 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5449 This tree_list node is later fed to `grokparms'.
5451 VOID_AT_END nonzero means append `void' to the end of the type-list.
5452 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5455 get_parm_info (void_at_end)
5458 register tree decl, t;
5459 register tree types = 0;
5461 tree tags = gettags ();
5462 tree parms = getdecls ();
5464 tree order = current_binding_level->parm_order;
5466 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5467 if (void_at_end && parms != 0
5468 && TREE_CHAIN (parms) == 0
5469 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5470 && DECL_NAME (parms) == 0)
5473 storedecls (NULL_TREE);
5474 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5475 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5478 /* Extract enumerator values and other non-parms declared with the parms.
5479 Likewise any forward parm decls that didn't have real parm decls. */
5480 for (decl = parms; decl; )
5482 tree next = TREE_CHAIN (decl);
5484 if (TREE_CODE (decl) != PARM_DECL)
5486 TREE_CHAIN (decl) = new_parms;
5489 else if (TREE_ASM_WRITTEN (decl))
5491 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5492 TREE_CHAIN (decl) = new_parms;
5498 /* Put the parm decls back in the order they were in in the parm list. */
5499 for (t = order; t; t = TREE_CHAIN (t))
5502 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5504 TREE_CHAIN (TREE_VALUE (t)) = 0;
5507 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5510 /* Store the parmlist in the binding level since the old one
5511 is no longer a valid list. (We have changed the chain pointers.) */
5512 storedecls (new_parms);
5514 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5515 /* There may also be declarations for enumerators if an enumeration
5516 type is declared among the parms. Ignore them here. */
5517 if (TREE_CODE (decl) == PARM_DECL)
5519 /* Since there is a prototype,
5520 args are passed in their declared types. */
5521 tree type = TREE_TYPE (decl);
5522 DECL_ARG_TYPE (decl) = type;
5523 #ifdef PROMOTE_PROTOTYPES
5524 if ((TREE_CODE (type) == INTEGER_TYPE
5525 || TREE_CODE (type) == ENUMERAL_TYPE)
5526 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5527 DECL_ARG_TYPE (decl) = integer_type_node;
5530 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5531 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5532 && DECL_NAME (decl) == 0)
5534 error ("`void' in parameter list must be the entire list");
5540 return saveable_tree_cons (new_parms, tags,
5541 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5543 return saveable_tree_cons (new_parms, tags, nreverse (types));
5546 /* At end of parameter list, warn about any struct, union or enum tags
5547 defined within. Do so because these types cannot ever become complete. */
5550 parmlist_tags_warning ()
5555 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5557 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5558 /* An anonymous union parm type is meaningful as a GNU extension.
5559 So don't warn for that. */
5560 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5562 if (TREE_PURPOSE (elt) != 0)
5563 warning ("`%s %s' declared inside parameter list",
5564 (code == RECORD_TYPE ? "struct"
5565 : code == UNION_TYPE ? "union"
5567 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5569 warning ("anonymous %s declared inside parameter list",
5570 (code == RECORD_TYPE ? "struct"
5571 : code == UNION_TYPE ? "union"
5576 warning ("its scope is only this definition or declaration,");
5577 warning ("which is probably not what you want.");
5583 /* Get the struct, enum or union (CODE says which) with tag NAME.
5584 Define the tag as a forward-reference if it is not defined. */
5587 xref_tag (code, name)
5588 enum tree_code code;
5591 int temporary = allocation_temporary_p ();
5593 /* If a cross reference is requested, look up the type
5594 already defined for this tag and return it. */
5596 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5597 /* Even if this is the wrong type of tag, return what we found.
5598 There will be an error message anyway, from pending_xref_error.
5599 If we create an empty xref just for an invalid use of the type,
5600 the main result is to create lots of superfluous error messages. */
5604 push_obstacks_nochange ();
5606 if (current_binding_level == global_binding_level && temporary)
5607 end_temporary_allocation ();
5609 /* If no such tag is yet defined, create a forward-reference node
5610 and record it as the "definition".
5611 When a real declaration of this type is found,
5612 the forward-reference will be altered into a real type. */
5614 ref = make_node (code);
5615 if (code == ENUMERAL_TYPE)
5617 /* (In ANSI, Enums can be referred to only if already defined.) */
5619 pedwarn ("ANSI C forbids forward references to `enum' types");
5620 /* Give the type a default layout like unsigned int
5621 to avoid crashing if it does not get defined. */
5622 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5623 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5624 TREE_UNSIGNED (ref) = 1;
5625 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5626 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5627 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5630 pushtag (name, ref);
5637 /* Make sure that the tag NAME is defined *in the current binding level*
5638 at least as a forward reference.
5639 CODE says which kind of tag NAME ought to be.
5641 We also do a push_obstacks_nochange
5642 whose matching pop is in finish_struct. */
5645 start_struct (code, name)
5646 enum tree_code code;
5649 /* If there is already a tag defined at this binding level
5650 (as a forward reference), just return it. */
5652 register tree ref = 0;
5654 push_obstacks_nochange ();
5655 if (current_binding_level == global_binding_level)
5656 end_temporary_allocation ();
5659 ref = lookup_tag (code, name, current_binding_level, 1);
5660 if (ref && TREE_CODE (ref) == code)
5662 C_TYPE_BEING_DEFINED (ref) = 1;
5663 TYPE_PACKED (ref) = flag_pack_struct;
5664 if (TYPE_FIELDS (ref))
5665 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5666 : "redefinition of `struct %s'"),
5667 IDENTIFIER_POINTER (name));
5672 /* Otherwise create a forward-reference just so the tag is in scope. */
5674 ref = make_node (code);
5675 pushtag (name, ref);
5676 C_TYPE_BEING_DEFINED (ref) = 1;
5677 TYPE_PACKED (ref) = flag_pack_struct;
5681 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5682 of a structure component, returning a FIELD_DECL node.
5683 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5685 This is done during the parsing of the struct declaration.
5686 The FIELD_DECL nodes are chained together and the lot of them
5687 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5690 grokfield (filename, line, declarator, declspecs, width)
5693 tree declarator, declspecs, width;
5697 /* The corresponding pop_obstacks is in finish_decl. */
5698 push_obstacks_nochange ();
5700 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5702 finish_decl (value, NULL_TREE, NULL_TREE);
5703 DECL_INITIAL (value) = width;
5705 maybe_objc_check_decl (value);
5709 /* Function to help qsort sort FIELD_DECLs by name order. */
5712 field_decl_cmp (xp, yp)
5713 const GENERIC_PTR xp;
5714 const GENERIC_PTR yp;
5716 tree *x = (tree *)xp, *y = (tree *)yp;
5718 if (DECL_NAME (*x) == DECL_NAME (*y))
5720 if (DECL_NAME (*x) == NULL)
5722 if (DECL_NAME (*y) == NULL)
5724 if (DECL_NAME (*x) < DECL_NAME (*y))
5729 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5730 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5731 ATTRIBUTES are attributes to be applied to the structure.
5733 We also do a pop_obstacks to match the push in start_struct. */
5736 finish_struct (t, fieldlist, attributes)
5743 int toplevel = global_binding_level == current_binding_level;
5745 /* If this type was previously laid out as a forward reference,
5746 make sure we lay it out again. */
5750 decl_attributes (t, attributes, NULL_TREE);
5752 /* Nameless union parm types are useful as GCC extension. */
5753 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5754 /* Otherwise, warn about any struct or union def. in parmlist. */
5755 if (in_parm_level_p ())
5758 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5759 : "structure defined inside parms"));
5760 else if (! flag_traditional)
5761 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5762 : "structure defined inside parms"));
5765 old_momentary = suspend_momentary ();
5769 for (x = fieldlist; x; x = TREE_CHAIN (x))
5770 if (DECL_NAME (x) != 0)
5774 pedwarn ("%s has no %smembers",
5775 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5776 (fieldlist ? "named " : ""));
5779 /* Install struct as DECL_CONTEXT of each field decl.
5780 Also process specified field sizes.
5781 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5782 The specified size is found in the DECL_INITIAL.
5783 Store 0 there, except for ": 0" fields (so we can find them
5784 and delete them, below). */
5786 for (x = fieldlist; x; x = TREE_CHAIN (x))
5788 DECL_CONTEXT (x) = t;
5789 DECL_PACKED (x) |= TYPE_PACKED (t);
5790 DECL_FIELD_SIZE (x) = 0;
5792 /* If any field is const, the structure type is pseudo-const. */
5793 if (TREE_READONLY (x))
5794 C_TYPE_FIELDS_READONLY (t) = 1;
5797 /* A field that is pseudo-const makes the structure likewise. */
5798 tree t1 = TREE_TYPE (x);
5799 while (TREE_CODE (t1) == ARRAY_TYPE)
5800 t1 = TREE_TYPE (t1);
5801 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5802 && C_TYPE_FIELDS_READONLY (t1))
5803 C_TYPE_FIELDS_READONLY (t) = 1;
5806 /* Any field that is volatile means variables of this type must be
5807 treated in some ways as volatile. */
5808 if (TREE_THIS_VOLATILE (x))
5809 C_TYPE_FIELDS_VOLATILE (t) = 1;
5811 /* Any field of nominal variable size implies structure is too. */
5812 if (C_DECL_VARIABLE_SIZE (x))
5813 C_TYPE_VARIABLE_SIZE (t) = 1;
5815 /* Detect invalid nested redefinition. */
5816 if (TREE_TYPE (x) == t)
5817 error ("nested redefinition of `%s'",
5818 IDENTIFIER_POINTER (TYPE_NAME (t)));
5820 /* Detect invalid bit-field size. */
5821 if (DECL_INITIAL (x))
5822 STRIP_NOPS (DECL_INITIAL (x));
5823 if (DECL_INITIAL (x))
5825 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5826 constant_expression_warning (DECL_INITIAL (x));
5829 error_with_decl (x, "bit-field `%s' width not an integer constant");
5830 DECL_INITIAL (x) = NULL;
5834 /* Detect invalid bit-field type. */
5835 if (DECL_INITIAL (x)
5836 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5837 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5839 error_with_decl (x, "bit-field `%s' has invalid type");
5840 DECL_INITIAL (x) = NULL;
5842 if (DECL_INITIAL (x) && pedantic
5843 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5844 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5845 /* Accept an enum that's equivalent to int or unsigned int. */
5846 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5847 && (TYPE_PRECISION (TREE_TYPE (x))
5848 == TYPE_PRECISION (integer_type_node))))
5849 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5851 /* Detect and ignore out of range field width. */
5852 if (DECL_INITIAL (x))
5854 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5856 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5858 DECL_INITIAL (x) = NULL;
5859 error_with_decl (x, "negative width in bit-field `%s'");
5861 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5862 || width > TYPE_PRECISION (TREE_TYPE (x)))
5864 DECL_INITIAL (x) = NULL;
5865 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5867 else if (width == 0 && DECL_NAME (x) != 0)
5869 error_with_decl (x, "zero width for bit-field `%s'");
5870 DECL_INITIAL (x) = NULL;
5874 /* Process valid field width. */
5875 if (DECL_INITIAL (x))
5877 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5879 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5880 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5881 TREE_UNSIGNED (TREE_TYPE (x)))
5882 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5883 TREE_UNSIGNED (TREE_TYPE (x)))))
5884 warning_with_decl (x, "`%s' is narrower than values of its type");
5886 DECL_FIELD_SIZE (x) = width;
5887 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5888 DECL_INITIAL (x) = NULL;
5892 /* field size 0 => force desired amount of alignment. */
5893 #ifdef EMPTY_FIELD_BOUNDARY
5894 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5896 #ifdef PCC_BITFIELD_TYPE_MATTERS
5897 if (PCC_BITFIELD_TYPE_MATTERS)
5898 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5899 TYPE_ALIGN (TREE_TYPE (x)));
5903 else if (TREE_TYPE (x) != error_mark_node)
5905 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5906 : TYPE_ALIGN (TREE_TYPE (x)));
5907 /* Non-bit-fields are aligned for their type, except packed
5908 fields which require only BITS_PER_UNIT alignment. */
5909 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5913 /* Now DECL_INITIAL is null on all members. */
5915 /* Delete all duplicate fields from the fieldlist */
5916 for (x = fieldlist; x && TREE_CHAIN (x);)
5917 /* Anonymous fields aren't duplicates. */
5918 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5922 register tree y = fieldlist;
5926 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5932 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5934 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5935 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5937 else x = TREE_CHAIN (x);
5940 /* Now we have the nearly final fieldlist. Record it,
5941 then lay out the structure or union (including the fields). */
5943 TYPE_FIELDS (t) = fieldlist;
5947 /* Delete all zero-width bit-fields from the front of the fieldlist */
5949 && DECL_INITIAL (fieldlist))
5950 fieldlist = TREE_CHAIN (fieldlist);
5951 /* Delete all such members from the rest of the fieldlist */
5952 for (x = fieldlist; x;)
5954 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5955 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5956 else x = TREE_CHAIN (x);
5959 /* Now we have the truly final field list.
5960 Store it in this type and in the variants. */
5962 TYPE_FIELDS (t) = fieldlist;
5964 /* If there are lots of fields, sort so we can look through them fast.
5965 We arbitrarily consider 16 or more elts to be "a lot". */
5969 for (x = fieldlist; x; x = TREE_CHAIN (x))
5980 len += list_length (x);
5981 /* Use the same allocation policy here that make_node uses, to
5982 ensure that this lives as long as the rest of the struct decl.
5983 All decls in an inline function need to be saved. */
5984 if (allocation_temporary_p ())
5985 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5987 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5989 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5990 TYPE_LANG_SPECIFIC (t)->len = len;
5992 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5994 for (x = fieldlist; x; x = TREE_CHAIN (x))
5995 field_array[len++] = x;
5997 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6001 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6003 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6004 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6005 TYPE_ALIGN (x) = TYPE_ALIGN (t);
6008 /* If this was supposed to be a transparent union, but we can't
6009 make it one, warn and turn off the flag. */
6010 if (TREE_CODE (t) == UNION_TYPE
6011 && TYPE_TRANSPARENT_UNION (t)
6012 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
6014 TYPE_TRANSPARENT_UNION (t) = 0;
6015 warning ("union cannot be made transparent");
6018 /* If this structure or union completes the type of any previous
6019 variable declaration, lay it out and output its rtl. */
6021 if (current_binding_level->n_incomplete != 0)
6024 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
6026 if (TREE_TYPE (decl) == t
6027 && TREE_CODE (decl) != TYPE_DECL)
6029 layout_decl (decl, 0);
6030 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6031 maybe_objc_check_decl (decl);
6032 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6035 --current_binding_level->n_incomplete;
6037 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6038 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6040 tree element = TREE_TYPE (decl);
6041 while (TREE_CODE (element) == ARRAY_TYPE)
6042 element = TREE_TYPE (element);
6044 layout_array_type (TREE_TYPE (decl));
6049 resume_momentary (old_momentary);
6051 /* Finish debugging output for this type. */
6052 rest_of_type_compilation (t, toplevel);
6054 /* The matching push is in start_struct. */
6060 /* Lay out the type T, and its element type, and so on. */
6063 layout_array_type (t)
6066 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6067 layout_array_type (TREE_TYPE (t));
6071 /* Begin compiling the definition of an enumeration type.
6072 NAME is its name (or null if anonymous).
6073 Returns the type object, as yet incomplete.
6074 Also records info about it so that build_enumerator
6075 may be used to declare the individual values as they are read. */
6081 register tree enumtype = 0;
6083 /* If this is the real definition for a previous forward reference,
6084 fill in the contents in the same object that used to be the
6085 forward reference. */
6088 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6090 /* The corresponding pop_obstacks is in finish_enum. */
6091 push_obstacks_nochange ();
6092 /* If these symbols and types are global, make them permanent. */
6093 if (current_binding_level == global_binding_level)
6094 end_temporary_allocation ();
6096 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6098 enumtype = make_node (ENUMERAL_TYPE);
6099 pushtag (name, enumtype);
6102 C_TYPE_BEING_DEFINED (enumtype) = 1;
6104 if (TYPE_VALUES (enumtype) != 0)
6106 /* This enum is a named one that has been declared already. */
6107 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6109 /* Completely replace its old definition.
6110 The old enumerators remain defined, however. */
6111 TYPE_VALUES (enumtype) = 0;
6114 enum_next_value = integer_zero_node;
6117 if (flag_short_enums)
6118 TYPE_PACKED (enumtype) = 1;
6123 /* After processing and defining all the values of an enumeration type,
6124 install their decls in the enumeration type and finish it off.
6125 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6126 and ATTRIBUTES are the specified attributes.
6127 Returns ENUMTYPE. */
6130 finish_enum (enumtype, values, attributes)
6135 register tree pair, tem;
6136 tree minnode = 0, maxnode = 0;
6137 int lowprec, highprec, precision;
6138 int toplevel = global_binding_level == current_binding_level;
6140 if (in_parm_level_p ())
6141 warning ("enum defined inside parms");
6143 decl_attributes (enumtype, attributes, NULL_TREE);
6145 /* Calculate the maximum value of any enumerator in this type. */
6147 if (values == error_mark_node)
6148 minnode = maxnode = integer_zero_node;
6150 for (pair = values; pair; pair = TREE_CHAIN (pair))
6152 tree value = TREE_VALUE (pair);
6154 minnode = maxnode = TREE_VALUE (pair);
6157 if (tree_int_cst_lt (maxnode, value))
6159 if (tree_int_cst_lt (value, minnode))
6164 TYPE_MIN_VALUE (enumtype) = minnode;
6165 TYPE_MAX_VALUE (enumtype) = maxnode;
6167 /* An enum can have some negative values; then it is signed. */
6168 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6170 /* Determine the precision this type needs. */
6172 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6173 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6174 precision = MAX (lowprec, highprec);
6176 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6178 tree narrowest = type_for_size (precision, 1);
6181 warning ("enumeration values exceed range of largest integer");
6182 narrowest = long_long_integer_type_node;
6185 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6188 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6190 TYPE_SIZE (enumtype) = 0;
6191 layout_type (enumtype);
6193 if (values != error_mark_node)
6195 /* Change the type of the enumerators to be the enum type.
6196 Formerly this was done only for enums that fit in an int,
6197 but the comment said it was done only for enums wider than int.
6198 It seems necessary to do this for wide enums,
6199 and best not to change what's done for ordinary narrower ones. */
6200 for (pair = values; pair; pair = TREE_CHAIN (pair))
6202 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6203 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6204 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6205 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6208 /* Replace the decl nodes in VALUES with their names. */
6209 for (pair = values; pair; pair = TREE_CHAIN (pair))
6210 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6212 TYPE_VALUES (enumtype) = values;
6215 /* Fix up all variant types of this enum type. */
6216 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6218 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6219 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6220 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6221 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6222 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6223 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6224 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6225 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6226 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6229 /* Finish debugging output for this type. */
6230 rest_of_type_compilation (enumtype, toplevel);
6232 /* This matches a push in start_enum. */
6238 /* Build and install a CONST_DECL for one value of the
6239 current enumeration type (one that was begun with start_enum).
6240 Return a tree-list containing the CONST_DECL and its value.
6241 Assignment of sequential values by default is handled here. */
6244 build_enumerator (name, value)
6247 register tree decl, type;
6249 /* Validate and default VALUE. */
6251 /* Remove no-op casts from the value. */
6253 STRIP_TYPE_NOPS (value);
6257 if (TREE_CODE (value) == INTEGER_CST)
6259 value = default_conversion (value);
6260 constant_expression_warning (value);
6264 error ("enumerator value for `%s' not integer constant",
6265 IDENTIFIER_POINTER (name));
6270 /* Default based on previous value. */
6271 /* It should no longer be possible to have NON_LVALUE_EXPR
6275 value = enum_next_value;
6277 error ("overflow in enumeration values");
6280 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6282 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6283 value = integer_zero_node;
6286 /* Set basis for default for next value. */
6287 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6288 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6290 /* Now create a declaration for the enum value name. */
6292 type = TREE_TYPE (value);
6293 type = type_for_size (MAX (TYPE_PRECISION (type),
6294 TYPE_PRECISION (integer_type_node)),
6296 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6297 && TREE_UNSIGNED (type)));
6299 decl = build_decl (CONST_DECL, name, type);
6300 DECL_INITIAL (decl) = value;
6301 TREE_TYPE (value) = type;
6304 return saveable_tree_cons (decl, value, NULL_TREE);
6307 /* Create the FUNCTION_DECL for a function definition.
6308 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6309 the declaration; they describe the function's name and the type it returns,
6310 but twisted together in a fashion that parallels the syntax of C.
6312 This function creates a binding context for the function body
6313 as well as setting up the FUNCTION_DECL in current_function_decl.
6315 Returns 1 on success. If the DECLARATOR is not suitable for a function
6316 (it defines a datum instead), we return 0, which tells
6317 yyparse to report a parse error.
6319 NESTED is nonzero for a function nested within another function. */
6322 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6323 tree declarator, declspecs, prefix_attributes, attributes;
6326 tree decl1, old_decl;
6328 int old_immediate_size_expand = immediate_size_expand;
6330 current_function_returns_value = 0; /* Assume, until we see it does. */
6331 current_function_returns_null = 0;
6332 warn_about_return_type = 0;
6333 current_extern_inline = 0;
6334 c_function_varargs = 0;
6336 shadowed_labels = 0;
6338 /* Don't expand any sizes in the return type of the function. */
6339 immediate_size_expand = 0;
6341 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6343 /* If the declarator is not suitable for a function definition,
6344 cause a syntax error. */
6347 immediate_size_expand = old_immediate_size_expand;
6351 decl_attributes (decl1, prefix_attributes, attributes);
6353 announce_function (decl1);
6355 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6357 error ("return-type is an incomplete type");
6358 /* Make it return void instead. */
6360 = build_function_type (void_type_node,
6361 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6364 if (warn_about_return_type)
6365 warning ("return-type defaults to `int'");
6367 /* Save the parm names or decls from this function's declarator
6368 where store_parm_decls will find them. */
6369 current_function_parms = last_function_parms;
6370 current_function_parm_tags = last_function_parm_tags;
6372 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6373 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6374 DECL_INITIAL (decl1) = error_mark_node;
6376 /* If this definition isn't a prototype and we had a prototype declaration
6377 before, copy the arg type info from that prototype.
6378 But not if what we had before was a builtin function. */
6379 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6380 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6381 && !DECL_BUILT_IN (old_decl)
6382 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6383 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6384 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6386 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6387 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6388 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6391 /* If there is no explicit declaration, look for any out-of-scope implicit
6394 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6396 /* Optionally warn of old-fashioned def with no previous prototype. */
6397 if (warn_strict_prototypes
6398 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6399 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6400 warning ("function declaration isn't a prototype");
6401 /* Optionally warn of any global def with no previous prototype. */
6402 else if (warn_missing_prototypes
6403 && TREE_PUBLIC (decl1)
6404 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6405 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6406 warning_with_decl (decl1, "no previous prototype for `%s'");
6407 /* Optionally warn of any def with no previous prototype
6408 if the function has already been used. */
6409 else if (warn_missing_prototypes
6410 && old_decl != 0 && TREE_USED (old_decl)
6411 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6412 warning_with_decl (decl1,
6413 "`%s' was used with no prototype before its definition");
6414 /* Optionally warn of any global def with no previous declaration. */
6415 else if (warn_missing_declarations
6416 && TREE_PUBLIC (decl1)
6418 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6419 warning_with_decl (decl1, "no previous declaration for `%s'");
6420 /* Optionally warn of any def with no previous declaration
6421 if the function has already been used. */
6422 else if (warn_missing_declarations
6423 && old_decl != 0 && TREE_USED (old_decl)
6424 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6425 warning_with_decl (decl1,
6426 "`%s' was used with no declaration before its definition");
6428 /* This is a definition, not a reference.
6429 So normally clear DECL_EXTERNAL.
6430 However, `extern inline' acts like a declaration
6431 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6432 DECL_EXTERNAL (decl1) = current_extern_inline;
6434 /* This function exists in static storage.
6435 (This does not mean `static' in the C sense!) */
6436 TREE_STATIC (decl1) = 1;
6438 /* A nested function is not global. */
6439 if (current_function_decl != 0)
6440 TREE_PUBLIC (decl1) = 0;
6442 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6444 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6449 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6450 != integer_type_node)
6451 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6453 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6454 args = TREE_CHAIN (args))
6456 tree type = args ? TREE_VALUE (args) : 0;
6458 if (type == void_type_node)
6465 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6466 pedwarn_with_decl (decl1,
6467 "first argument of `%s' should be `int'");
6471 if (TREE_CODE (type) != POINTER_TYPE
6472 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6473 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6475 pedwarn_with_decl (decl1,
6476 "second argument of `%s' should be `char **'");
6480 if (TREE_CODE (type) != POINTER_TYPE
6481 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6482 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6484 pedwarn_with_decl (decl1,
6485 "third argument of `%s' should probably be `char **'");
6490 /* It is intentional that this message does not mention the third
6491 argument, which is warned for only pedantically, because it's
6492 blessed by mention in an appendix of the standard. */
6493 if (argct > 0 && (argct < 2 || argct > 3))
6494 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6496 if (argct == 3 && pedantic)
6497 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6499 if (! TREE_PUBLIC (decl1))
6500 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6503 /* Record the decl so that the function name is defined.
6504 If we already have a decl for this name, and it is a FUNCTION_DECL,
6505 use the old decl. */
6507 current_function_decl = pushdecl (decl1);
6510 declare_parm_level (1);
6511 current_binding_level->subblocks_tag_transparent = 1;
6513 make_function_rtl (current_function_decl);
6515 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6516 /* Promote the value to int before returning it. */
6517 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6519 /* It retains unsignedness if traditional
6520 or if not really getting wider. */
6521 if (TREE_UNSIGNED (restype)
6522 && (flag_traditional
6523 || (TYPE_PRECISION (restype)
6524 == TYPE_PRECISION (integer_type_node))))
6525 restype = unsigned_type_node;
6527 restype = integer_type_node;
6529 DECL_RESULT (current_function_decl)
6530 = build_decl (RESULT_DECL, NULL_TREE, restype);
6533 /* Allocate further tree nodes temporarily during compilation
6534 of this function only. */
6535 temporary_allocation ();
6537 /* If this fcn was already referenced via a block-scope `extern' decl
6538 (or an implicit decl), propagate certain information about the usage. */
6539 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6540 TREE_ADDRESSABLE (current_function_decl) = 1;
6542 immediate_size_expand = old_immediate_size_expand;
6547 /* Record that this function is going to be a varargs function.
6548 This is called before store_parm_decls, which is too early
6549 to call mark_varargs directly. */
6554 c_function_varargs = 1;
6557 /* Store the parameter declarations into the current function declaration.
6558 This is called after parsing the parameter declarations, before
6559 digesting the body of the function.
6561 For an old-style definition, modify the function's type
6562 to specify at least the number of arguments. */
6567 register tree fndecl = current_function_decl;
6570 /* This is either a chain of PARM_DECLs (if a prototype was used)
6571 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6572 tree specparms = current_function_parms;
6574 /* This is a list of types declared among parms in a prototype. */
6575 tree parmtags = current_function_parm_tags;
6577 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6578 register tree parmdecls = getdecls ();
6580 /* This is a chain of any other decls that came in among the parm
6581 declarations. If a parm is declared with enum {foo, bar} x;
6582 then CONST_DECLs for foo and bar are put here. */
6585 /* Nonzero if this definition is written with a prototype. */
6588 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6590 /* This case is when the function was defined with an ANSI prototype.
6591 The parms already have decls, so we need not do anything here
6592 except record them as in effect
6593 and complain if any redundant old-style parm decls were written. */
6604 error_with_decl (fndecl,
6605 "parm types given both in parmlist and separately");
6606 /* Get rid of the erroneous decls; don't keep them on
6607 the list of parms, since they might not be PARM_DECLs. */
6608 for (decl = current_binding_level->names;
6609 decl; decl = TREE_CHAIN (decl))
6610 if (DECL_NAME (decl))
6611 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6612 for (link = current_binding_level->shadowed;
6613 link; link = TREE_CHAIN (link))
6614 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6615 current_binding_level->names = 0;
6616 current_binding_level->shadowed = 0;
6619 specparms = nreverse (specparms);
6620 for (parm = specparms; parm; parm = next)
6622 next = TREE_CHAIN (parm);
6623 if (TREE_CODE (parm) == PARM_DECL)
6625 if (DECL_NAME (parm) == 0)
6626 error_with_decl (parm, "parameter name omitted");
6627 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6629 error_with_decl (parm, "parameter `%s' declared void");
6630 /* Change the type to error_mark_node so this parameter
6631 will be ignored by assign_parms. */
6632 TREE_TYPE (parm) = error_mark_node;
6638 /* If we find an enum constant or a type tag,
6639 put it aside for the moment. */
6640 TREE_CHAIN (parm) = 0;
6641 others = chainon (others, parm);
6645 /* Get the decls in their original chain order
6646 and record in the function. */
6647 DECL_ARGUMENTS (fndecl) = getdecls ();
6650 /* If this function takes a variable number of arguments,
6651 add a phony parameter to the end of the parm list,
6652 to represent the position of the first unnamed argument. */
6653 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6656 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6657 /* Let's hope the address of the unnamed parm
6658 won't depend on its type. */
6659 TREE_TYPE (dummy) = integer_type_node;
6660 DECL_ARG_TYPE (dummy) = integer_type_node;
6661 DECL_ARGUMENTS (fndecl)
6662 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6666 /* Now pushdecl the enum constants. */
6667 for (parm = others; parm; parm = next)
6669 next = TREE_CHAIN (parm);
6670 if (DECL_NAME (parm) == 0)
6672 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6674 else if (TREE_CODE (parm) != PARM_DECL)
6678 storetags (chainon (parmtags, gettags ()));
6682 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6683 each with a parm name as the TREE_VALUE.
6685 PARMDECLS is a chain of declarations for parameters.
6686 Warning! It can also contain CONST_DECLs which are not parameters
6687 but are names of enumerators of any enum types
6688 declared among the parameters.
6690 First match each formal parameter name with its declaration.
6691 Associate decls with the names and store the decls
6692 into the TREE_PURPOSE slots. */
6694 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6695 DECL_RESULT (parm) = 0;
6697 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6699 register tree tail, found = NULL;
6701 if (TREE_VALUE (parm) == 0)
6703 error_with_decl (fndecl, "parameter name missing from parameter list");
6704 TREE_PURPOSE (parm) = 0;
6708 /* See if any of the parmdecls specifies this parm by name.
6709 Ignore any enumerator decls. */
6710 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6711 if (DECL_NAME (tail) == TREE_VALUE (parm)
6712 && TREE_CODE (tail) == PARM_DECL)
6718 /* If declaration already marked, we have a duplicate name.
6719 Complain, and don't use this decl twice. */
6720 if (found && DECL_RESULT (found) != 0)
6722 error_with_decl (found, "multiple parameters named `%s'");
6726 /* If the declaration says "void", complain and ignore it. */
6727 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6729 error_with_decl (found, "parameter `%s' declared void");
6730 TREE_TYPE (found) = integer_type_node;
6731 DECL_ARG_TYPE (found) = integer_type_node;
6732 layout_decl (found, 0);
6735 /* Traditionally, a parm declared float is actually a double. */
6736 if (found && flag_traditional
6737 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6739 TREE_TYPE (found) = double_type_node;
6740 DECL_ARG_TYPE (found) = double_type_node;
6741 layout_decl (found, 0);
6744 /* If no declaration found, default to int. */
6747 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6749 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6750 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6751 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6753 warning_with_decl (found, "type of `%s' defaults to `int'");
6757 TREE_PURPOSE (parm) = found;
6759 /* Mark this decl as "already found" -- see test, above.
6760 It is safe to use DECL_RESULT for this
6761 since it is not used in PARM_DECLs or CONST_DECLs. */
6762 DECL_RESULT (found) = error_mark_node;
6765 /* Put anything which is on the parmdecls chain and which is
6766 not a PARM_DECL onto the list NONPARMS. (The types of
6767 non-parm things which might appear on the list include
6768 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6769 any actual PARM_DECLs not matched with any names. */
6772 for (parm = parmdecls; parm; )
6774 tree next = TREE_CHAIN (parm);
6775 TREE_CHAIN (parm) = 0;
6777 if (TREE_CODE (parm) != PARM_DECL)
6778 nonparms = chainon (nonparms, parm);
6781 /* Complain about args with incomplete types. */
6782 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6784 error_with_decl (parm, "parameter `%s' has incomplete type");
6785 TREE_TYPE (parm) = error_mark_node;
6788 if (DECL_RESULT (parm) == 0)
6790 error_with_decl (parm,
6791 "declaration for parameter `%s' but no such parameter");
6792 /* Pretend the parameter was not missing.
6793 This gets us to a standard state and minimizes
6794 further error messages. */
6796 = chainon (specparms,
6797 tree_cons (parm, NULL_TREE, NULL_TREE));
6804 /* Chain the declarations together in the order of the list of names. */
6805 /* Store that chain in the function decl, replacing the list of names. */
6807 DECL_ARGUMENTS (fndecl) = 0;
6810 for (last = 0; parm; parm = TREE_CHAIN (parm))
6811 if (TREE_PURPOSE (parm))
6814 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6816 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6817 last = TREE_PURPOSE (parm);
6818 TREE_CHAIN (last) = 0;
6822 /* If there was a previous prototype,
6823 set the DECL_ARG_TYPE of each argument according to
6824 the type previously specified, and report any mismatches. */
6826 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6829 for (parm = DECL_ARGUMENTS (fndecl),
6830 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6831 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6832 != void_type_node));
6833 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6835 if (parm == 0 || type == 0
6836 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6838 error ("number of arguments doesn't match prototype");
6839 error_with_file_and_line (current_function_prototype_file,
6840 current_function_prototype_line,
6841 "prototype declaration");
6844 /* Type for passing arg must be consistent
6845 with that declared for the arg. */
6846 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6848 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6849 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6851 /* Adjust argument to match prototype. E.g. a previous
6852 `int foo(float);' prototype causes
6853 `int foo(x) float x; {...}' to be treated like
6854 `int foo(float x) {...}'. This is particularly
6855 useful for argument types like uid_t. */
6856 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6857 #ifdef PROMOTE_PROTOTYPES
6858 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6859 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6860 && TYPE_PRECISION (TREE_TYPE (parm))
6861 < TYPE_PRECISION (integer_type_node))
6862 DECL_ARG_TYPE (parm) = integer_type_node;
6866 pedwarn ("promoted argument `%s' doesn't match prototype",
6867 IDENTIFIER_POINTER (DECL_NAME (parm)));
6868 warning_with_file_and_line
6869 (current_function_prototype_file,
6870 current_function_prototype_line,
6871 "prototype declaration");
6874 /* If -traditional, allow `int' argument to match
6875 `unsigned' prototype. */
6876 else if (! (flag_traditional
6877 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6878 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6880 error ("argument `%s' doesn't match prototype",
6881 IDENTIFIER_POINTER (DECL_NAME (parm)));
6882 error_with_file_and_line (current_function_prototype_file,
6883 current_function_prototype_line,
6884 "prototype declaration");
6888 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6891 /* Otherwise, create a prototype that would match. */
6895 tree actual = 0, last = 0, type;
6897 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6899 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6902 TREE_CHAIN (last) = type;
6907 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6909 TREE_CHAIN (last) = type;
6913 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6914 of the type of this function, but we need to avoid having this
6915 affect the types of other similarly-typed functions, so we must
6916 first force the generation of an identical (but separate) type
6917 node for the relevant function type. The new node we create
6918 will be a variant of the main variant of the original function
6921 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6923 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6926 /* Now store the final chain of decls for the arguments
6927 as the decl-chain of the current lexical scope.
6928 Put the enumerators in as well, at the front so that
6929 DECL_ARGUMENTS is not modified. */
6931 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6934 /* Make sure the binding level for the top of the function body
6935 gets a BLOCK if there are any in the function.
6936 Otherwise, the dbx output is wrong. */
6938 keep_next_if_subblocks = 1;
6940 /* ??? This might be an improvement,
6941 but needs to be thought about some more. */
6943 keep_next_level_flag = 1;
6946 /* Write a record describing this function definition to the prototypes
6947 file (if requested). */
6949 gen_aux_info_record (fndecl, 1, 0, prototype);
6951 /* Initialize the RTL code for the function. */
6953 init_function_start (fndecl, input_filename, lineno);
6955 /* If this is a varargs function, inform function.c. */
6957 if (c_function_varargs)
6960 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6962 declare_function_name ();
6964 /* Set up parameters and prepare for return, for the function. */
6966 expand_function_start (fndecl, 0);
6968 /* If this function is `main', emit a call to `__main'
6969 to run global initializers, etc. */
6970 if (DECL_NAME (fndecl)
6971 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6972 && DECL_CONTEXT (fndecl) == NULL_TREE)
6973 expand_main_function ();
6976 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6977 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6978 stands for an ellipsis in the identifier list.
6980 PARMLIST is the data returned by get_parm_info for the
6981 parmlist that follows the semicolon.
6983 We return a value of the same sort that get_parm_info returns,
6984 except that it describes the combination of identifiers and parmlist. */
6987 combine_parm_decls (specparms, parmlist, void_at_end)
6988 tree specparms, parmlist;
6991 register tree fndecl = current_function_decl;
6994 tree parmdecls = TREE_PURPOSE (parmlist);
6996 /* This is a chain of any other decls that came in among the parm
6997 declarations. They were separated already by get_parm_info,
6998 so we just need to keep them separate. */
6999 tree nonparms = TREE_VALUE (parmlist);
7003 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
7004 DECL_RESULT (parm) = 0;
7006 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
7008 register tree tail, found = NULL;
7010 /* See if any of the parmdecls specifies this parm by name. */
7011 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
7012 if (DECL_NAME (tail) == TREE_VALUE (parm))
7018 /* If declaration already marked, we have a duplicate name.
7019 Complain, and don't use this decl twice. */
7020 if (found && DECL_RESULT (found) != 0)
7022 error_with_decl (found, "multiple parameters named `%s'");
7026 /* If the declaration says "void", complain and ignore it. */
7027 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7029 error_with_decl (found, "parameter `%s' declared void");
7030 TREE_TYPE (found) = integer_type_node;
7031 DECL_ARG_TYPE (found) = integer_type_node;
7032 layout_decl (found, 0);
7035 /* Traditionally, a parm declared float is actually a double. */
7036 if (found && flag_traditional
7037 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7039 TREE_TYPE (found) = double_type_node;
7040 DECL_ARG_TYPE (found) = double_type_node;
7041 layout_decl (found, 0);
7044 /* If no declaration found, default to int. */
7047 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7049 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7050 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7051 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7052 error_with_decl (found, "type of parameter `%s' is not declared");
7056 TREE_PURPOSE (parm) = found;
7058 /* Mark this decl as "already found" -- see test, above.
7059 It is safe to use DECL_RESULT for this
7060 since it is not used in PARM_DECLs or CONST_DECLs. */
7061 DECL_RESULT (found) = error_mark_node;
7064 /* Complain about any actual PARM_DECLs not matched with any names. */
7066 for (parm = parmdecls; parm; )
7068 tree next = TREE_CHAIN (parm);
7069 TREE_CHAIN (parm) = 0;
7071 /* Complain about args with incomplete types. */
7072 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7074 error_with_decl (parm, "parameter `%s' has incomplete type");
7075 TREE_TYPE (parm) = error_mark_node;
7078 if (DECL_RESULT (parm) == 0)
7080 error_with_decl (parm,
7081 "declaration for parameter `%s' but no such parameter");
7082 /* Pretend the parameter was not missing.
7083 This gets us to a standard state and minimizes
7084 further error messages. */
7086 = chainon (specparms,
7087 tree_cons (parm, NULL_TREE, NULL_TREE));
7093 /* Chain the declarations together in the order of the list of names.
7094 At the same time, build up a list of their types, in reverse order. */
7100 for (last = 0; parm; parm = TREE_CHAIN (parm))
7101 if (TREE_PURPOSE (parm))
7104 parmdecls = TREE_PURPOSE (parm);
7106 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7107 last = TREE_PURPOSE (parm);
7108 TREE_CHAIN (last) = 0;
7110 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7115 return saveable_tree_cons (parmdecls, nonparms,
7116 nreverse (saveable_tree_cons (NULL_TREE,
7120 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7123 /* Finish up a function declaration and compile that function
7124 all the way to assembler language output. The free the storage
7125 for the function definition.
7127 This is called after parsing the body of the function definition.
7129 NESTED is nonzero if the function being finished is nested in another. */
7132 finish_function (nested)
7135 register tree fndecl = current_function_decl;
7137 /* TREE_READONLY (fndecl) = 1;
7138 This caused &foo to be of type ptr-to-const-function
7139 which then got a warning when stored in a ptr-to-function variable. */
7142 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7144 /* Must mark the RESULT_DECL as being in this function. */
7146 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7148 /* Obey `register' declarations if `setjmp' is called in this fn. */
7149 if (flag_traditional && current_function_calls_setjmp)
7151 setjmp_protect (DECL_INITIAL (fndecl));
7152 setjmp_protect_args ();
7155 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7157 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7158 != integer_type_node)
7160 /* You would expect the sense of this test to be the other way
7161 around, but if warn_main is set, we will already have warned,
7162 so this would be a duplicate. This is the warning you get
7163 in some environments even if you *don't* ask for it, because
7164 these are environments where it may be more of a problem than
7167 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7171 #ifdef DEFAULT_MAIN_RETURN
7172 /* Make it so that `main' always returns success by default. */
7173 DEFAULT_MAIN_RETURN;
7178 /* Generate rtl for function exit. */
7179 expand_function_end (input_filename, lineno, 0);
7181 /* So we can tell if jump_optimize sets it to 1. */
7184 /* Run the optimizers and output the assembler code for this function. */
7185 rest_of_compilation (fndecl);
7187 current_function_returns_null |= can_reach_end;
7189 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7190 warning ("`noreturn' function does return");
7191 else if (warn_return_type && can_reach_end
7192 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7193 /* If this function returns non-void and control can drop through,
7195 warning ("control reaches end of non-void function");
7196 /* With just -W, complain only if function returns both with
7197 and without a value. */
7198 else if (extra_warnings
7199 && current_function_returns_value && current_function_returns_null)
7200 warning ("this function may return with or without a value");
7202 /* If requested, warn about function definitions where the function will
7203 return a value (usually of some struct or union type) which itself will
7204 take up a lot of stack space. */
7206 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7208 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7212 register tree ret_type_size = TYPE_SIZE (ret_type);
7214 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7217 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7219 if (units > larger_than_size)
7220 warning_with_decl (fndecl,
7221 "size of return value of `%s' is %u bytes",
7227 /* Free all the tree nodes making up this function. */
7228 /* Switch back to allocating nodes permanently
7229 until we start another function. */
7231 permanent_allocation (1);
7233 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7235 /* Stop pointing to the local nodes about to be freed. */
7236 /* But DECL_INITIAL must remain nonzero so we know this
7237 was an actual function definition. */
7238 /* For a nested function, this is done in pop_c_function_context. */
7239 /* If rest_of_compilation set this to 0, leave it 0. */
7240 if (DECL_INITIAL (fndecl) != 0)
7241 DECL_INITIAL (fndecl) = error_mark_node;
7242 DECL_ARGUMENTS (fndecl) = 0;
7245 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7247 #ifndef ASM_OUTPUT_CONSTRUCTOR
7248 if (! flag_gnu_linker)
7249 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7252 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7254 if (DECL_STATIC_DESTRUCTOR (fndecl))
7256 #ifndef ASM_OUTPUT_DESTRUCTOR
7257 if (! flag_gnu_linker)
7258 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7261 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7266 /* Let the error reporting routines know that we're outside a
7267 function. For a nested function, this value is used in
7268 pop_c_function_context and then reset via pop_function_context. */
7269 current_function_decl = NULL;
7273 /* Save and restore the variables in this file and elsewhere
7274 that keep track of the progress of compilation of the current function.
7275 Used for nested functions. */
7279 struct c_function *next;
7281 tree shadowed_labels;
7284 int warn_about_return_type;
7286 struct binding_level *binding_level;
7289 struct c_function *c_function_chain;
7291 /* Save and reinitialize the variables
7292 used during compilation of a C function. */
7295 push_c_function_context ()
7297 struct c_function *p
7298 = (struct c_function *) xmalloc (sizeof (struct c_function));
7301 pedwarn ("ANSI C forbids nested functions");
7303 push_function_context ();
7305 p->next = c_function_chain;
7306 c_function_chain = p;
7308 p->named_labels = named_labels;
7309 p->shadowed_labels = shadowed_labels;
7310 p->returns_value = current_function_returns_value;
7311 p->returns_null = current_function_returns_null;
7312 p->warn_about_return_type = warn_about_return_type;
7313 p->extern_inline = current_extern_inline;
7314 p->binding_level = current_binding_level;
7317 /* Restore the variables used during compilation of a C function. */
7320 pop_c_function_context ()
7322 struct c_function *p = c_function_chain;
7325 /* Bring back all the labels that were shadowed. */
7326 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7327 if (DECL_NAME (TREE_VALUE (link)) != 0)
7328 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7329 = TREE_VALUE (link);
7331 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7333 /* Stop pointing to the local nodes about to be freed. */
7334 /* But DECL_INITIAL must remain nonzero so we know this
7335 was an actual function definition. */
7336 DECL_INITIAL (current_function_decl) = error_mark_node;
7337 DECL_ARGUMENTS (current_function_decl) = 0;
7340 pop_function_context ();
7342 c_function_chain = p->next;
7344 named_labels = p->named_labels;
7345 shadowed_labels = p->shadowed_labels;
7346 current_function_returns_value = p->returns_value;
7347 current_function_returns_null = p->returns_null;
7348 warn_about_return_type = p->warn_about_return_type;
7349 current_extern_inline = p->extern_inline;
7350 current_binding_level = p->binding_level;
7355 /* integrate_decl_tree calls this function, but since we don't use the
7356 DECL_LANG_SPECIFIC field, this is a no-op. */
7359 copy_lang_decl (node)
7360 tree node ATTRIBUTE_UNUSED;