1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
40 extern cpp_reader parse_in;
41 extern cpp_options parse_options;
42 static int cpp_initialized;
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
54 #ifndef CHAR_TYPE_SIZE
55 #define CHAR_TYPE_SIZE BITS_PER_UNIT
58 #ifndef SHORT_TYPE_SIZE
59 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
63 #define INT_TYPE_SIZE BITS_PER_WORD
66 #ifndef LONG_TYPE_SIZE
67 #define LONG_TYPE_SIZE BITS_PER_WORD
70 #ifndef LONG_LONG_TYPE_SIZE
71 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
74 #ifndef WCHAR_UNSIGNED
75 #define WCHAR_UNSIGNED 0
78 #ifndef FLOAT_TYPE_SIZE
79 #define FLOAT_TYPE_SIZE BITS_PER_WORD
82 #ifndef DOUBLE_TYPE_SIZE
83 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
86 #ifndef LONG_DOUBLE_TYPE_SIZE
87 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
90 /* We let tm.h override the types used here, to handle trivial differences
91 such as the choice of unsigned int or long unsigned int for size_t.
92 When machines start needing nontrivial differences in the size type,
93 it would be best to do something here to figure out automatically
94 from other information what type to use. */
97 #define SIZE_TYPE "long unsigned int"
101 #define PTRDIFF_TYPE "long int"
105 #define WCHAR_TYPE "int"
108 /* a node which has tree code ERROR_MARK, and whose type is itself.
109 All erroneous expressions are replaced with this node. All functions
110 that accept nodes as arguments should avoid generating error messages
111 if this node is one of the arguments, since it is undesirable to get
112 multiple error messages from one error in the input. */
114 tree error_mark_node;
116 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
118 tree short_integer_type_node;
119 tree integer_type_node;
120 tree long_integer_type_node;
121 tree long_long_integer_type_node;
123 tree short_unsigned_type_node;
124 tree unsigned_type_node;
125 tree long_unsigned_type_node;
126 tree long_long_unsigned_type_node;
128 tree boolean_type_node;
129 tree boolean_false_node;
130 tree boolean_true_node;
132 tree ptrdiff_type_node;
134 tree unsigned_char_type_node;
135 tree signed_char_type_node;
137 tree wchar_type_node;
138 tree signed_wchar_type_node;
139 tree unsigned_wchar_type_node;
141 tree float_type_node;
142 tree double_type_node;
143 tree long_double_type_node;
145 tree complex_integer_type_node;
146 tree complex_float_type_node;
147 tree complex_double_type_node;
148 tree complex_long_double_type_node;
150 tree intQI_type_node;
151 tree intHI_type_node;
152 tree intSI_type_node;
153 tree intDI_type_node;
154 tree intTI_type_node;
156 tree unsigned_intQI_type_node;
157 tree unsigned_intHI_type_node;
158 tree unsigned_intSI_type_node;
159 tree unsigned_intDI_type_node;
160 tree unsigned_intTI_type_node;
162 /* a VOID_TYPE node. */
166 /* Nodes for types `void *' and `const void *'. */
168 tree ptr_type_node, const_ptr_type_node;
170 /* Nodes for types `char *' and `const char *'. */
172 tree string_type_node, const_string_type_node;
174 /* Type `char[SOMENUMBER]'.
175 Used when an array of char is needed and the size is irrelevant. */
177 tree char_array_type_node;
179 /* Type `int[SOMENUMBER]' or something like it.
180 Used when an array of int needed and the size is irrelevant. */
182 tree int_array_type_node;
184 /* Type `wchar_t[SOMENUMBER]' or something like it.
185 Used when a wide string literal is created. */
187 tree wchar_array_type_node;
189 /* type `int ()' -- used for implicit declaration of functions. */
191 tree default_function_type;
193 /* function types `double (double)' and `double (double, double)', etc. */
195 tree double_ftype_double, double_ftype_double_double;
196 tree int_ftype_int, long_ftype_long;
197 tree float_ftype_float;
198 tree ldouble_ftype_ldouble;
200 /* Function type `void (void *, void *, int)' and similar ones */
202 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
204 /* Function type `char *(char *, char *)' and similar ones */
205 tree string_ftype_ptr_ptr, int_ftype_string_string;
207 /* Function type `int (const void *, const void *, size_t)' */
208 tree int_ftype_cptr_cptr_sizet;
210 /* Two expressions that are constants with value zero.
211 The first is of type `int', the second of type `void *'. */
213 tree integer_zero_node;
214 tree null_pointer_node;
216 /* A node for the integer constant 1. */
218 tree integer_one_node;
220 /* Nonzero if we have seen an invalid cross reference
221 to a struct, union, or enum, but not yet printed the message. */
223 tree pending_invalid_xref;
224 /* File and line to appear in the eventual error message. */
225 char *pending_invalid_xref_file;
226 int pending_invalid_xref_line;
228 /* While defining an enum type, this is 1 plus the last enumerator
229 constant value. Note that will do not have to save this or `enum_overflow'
230 around nested function definition since such a definition could only
231 occur in an enum value expression and we don't use these variables in
234 static tree enum_next_value;
236 /* Nonzero means that there was overflow computing enum_next_value. */
238 static int enum_overflow;
240 /* Parsing a function declarator leaves a list of parameter names
241 or a chain or parameter decls here. */
243 static tree last_function_parms;
245 /* Parsing a function declarator leaves here a chain of structure
246 and enum types declared in the parmlist. */
248 static tree last_function_parm_tags;
250 /* After parsing the declarator that starts a function definition,
251 `start_function' puts here the list of parameter names or chain of decls.
252 `store_parm_decls' finds it here. */
254 static tree current_function_parms;
256 /* Similar, for last_function_parm_tags. */
257 static tree current_function_parm_tags;
259 /* Similar, for the file and line that the prototype came from if this is
260 an old-style definition. */
261 static char *current_function_prototype_file;
262 static int current_function_prototype_line;
264 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
265 that have names. Here so we can clear out their names' definitions
266 at the end of the function. */
268 static tree named_labels;
270 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
272 static tree shadowed_labels;
274 /* Nonzero when store_parm_decls is called indicates a varargs function.
275 Value not meaningful after store_parm_decls. */
277 static int c_function_varargs;
279 /* The FUNCTION_DECL for the function currently being compiled,
280 or 0 if between functions. */
281 tree current_function_decl;
283 /* Set to 0 at beginning of a function definition, set to 1 if
284 a return statement that specifies a return value is seen. */
286 int current_function_returns_value;
288 /* Set to 0 at beginning of a function definition, set to 1 if
289 a return statement with no argument is seen. */
291 int current_function_returns_null;
293 /* Set to nonzero by `grokdeclarator' for a function
294 whose return type is defaulted, if warnings for this are desired. */
296 static int warn_about_return_type;
298 /* Nonzero when starting a function declared `extern inline'. */
300 static int current_extern_inline;
302 /* For each binding contour we allocate a binding_level structure
303 * which records the names defined in that contour.
306 * 1) one for each function definition,
307 * where internal declarations of the parameters appear.
308 * 2) one for each compound statement,
309 * to record its declarations.
311 * The current meaning of a name can be found by searching the levels from
312 * the current one out to the global one.
315 /* Note that the information in the `names' component of the global contour
316 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
320 /* A chain of _DECL nodes for all variables, constants, functions,
321 and typedef types. These are in the reverse of the order supplied.
325 /* A list of structure, union and enum definitions,
326 * for looking up tag names.
327 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
328 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
329 * or ENUMERAL_TYPE node.
333 /* For each level, a list of shadowed outer-level local definitions
334 to be restored when this level is popped.
335 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
336 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
339 /* For each level (except not the global one),
340 a chain of BLOCK nodes for all the levels
341 that were entered and exited one level down. */
344 /* The BLOCK node for this level, if one has been preallocated.
345 If 0, the BLOCK is allocated (if needed) when the level is popped. */
348 /* The binding level which this one is contained in (inherits from). */
349 struct binding_level *level_chain;
351 /* Nonzero for the level that holds the parameters of a function. */
354 /* Nonzero if this level "doesn't exist" for tags. */
355 char tag_transparent;
357 /* Nonzero if sublevels of this level "don't exist" for tags.
358 This is set in the parm level of a function definition
359 while reading the function body, so that the outermost block
360 of the function body will be tag-transparent. */
361 char subblocks_tag_transparent;
363 /* Nonzero means make a BLOCK for this level regardless of all else. */
366 /* Nonzero means make a BLOCK if this level has any subblocks. */
367 char keep_if_subblocks;
369 /* Number of decls in `names' that have incomplete
370 structure or union types. */
373 /* A list of decls giving the (reversed) specified order of parms,
374 not including any forward-decls in the parmlist.
375 This is so we can put the parms in proper order for assign_parms. */
379 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
381 /* The binding level currently in effect. */
383 static struct binding_level *current_binding_level;
385 /* A chain of binding_level structures awaiting reuse. */
387 static struct binding_level *free_binding_level;
389 /* The outermost binding level, for names of file scope.
390 This is created when the compiler is started and exists
391 through the entire run. */
393 static struct binding_level *global_binding_level;
395 /* Binding level structures are initialized by copying this one. */
397 static struct binding_level clear_binding_level
398 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
401 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
403 static int keep_next_level_flag;
405 /* Nonzero means make a BLOCK for the next level pushed
406 if it has subblocks. */
408 static int keep_next_if_subblocks;
410 /* The chain of outer levels of label scopes.
411 This uses the same data structure used for binding levels,
412 but it works differently: each link in the chain records
413 saved values of named_labels and shadowed_labels for
414 a label binding level outside the current one. */
416 static struct binding_level *label_level_chain;
418 /* Functions called automatically at the beginning and end of execution. */
420 tree static_ctors, static_dtors;
422 /* Forward declarations. */
424 static struct binding_level * make_binding_level PROTO((void));
425 static void clear_limbo_values PROTO((tree));
426 static int duplicate_decls PROTO((tree, tree, int));
427 static char *redeclaration_error_message PROTO((tree, tree));
428 static void storedecls PROTO((tree));
429 static void storetags PROTO((tree));
430 static tree lookup_tag PROTO((enum tree_code, tree,
431 struct binding_level *, int));
432 static tree lookup_tag_reverse PROTO((tree));
433 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
435 static tree grokparms PROTO((tree, int));
436 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
437 static void layout_array_type PROTO((tree));
439 /* C-specific option variables. */
441 /* Nonzero means allow type mismatches in conditional expressions;
442 just make their values `void'. */
444 int flag_cond_mismatch;
446 /* Nonzero means give `double' the same size as `float'. */
448 int flag_short_double;
450 /* Nonzero means don't recognize the keyword `asm'. */
454 /* Nonzero means don't recognize any builtin functions. */
458 /* Nonzero means don't recognize the non-ANSI builtin functions.
461 int flag_no_nonansi_builtin;
463 /* Nonzero means do some things the same way PCC does. */
465 int flag_traditional;
467 /* Nonzero means that we have builtin functions, and main is an int */
471 /* Nonzero means to allow single precision math even if we're generally
472 being traditional. */
473 int flag_allow_single_precision = 0;
475 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
477 int flag_signed_bitfields = 1;
478 int explicit_flag_signed_bitfields = 0;
480 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
482 int flag_no_ident = 0;
484 /* Nonzero means warn about use of implicit int. */
486 int warn_implicit_int;
488 /* Nonzero means message about use of implicit function declarations;
489 1 means warning; 2 means error. */
491 int mesg_implicit_function_declaration;
493 /* Nonzero means give string constants the type `const char *'
494 to get extra warnings from them. These warnings will be too numerous
495 to be useful, except in thoroughly ANSIfied programs. */
497 int warn_write_strings;
499 /* Nonzero means warn about pointer casts that can drop a type qualifier
500 from the pointer target type. */
504 /* Nonzero means warn when casting a function call to a type that does
505 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
506 when there is no previous declaration of sqrt or malloc. */
508 int warn_bad_function_cast;
510 /* Warn about traditional constructs whose meanings changed in ANSI C. */
512 int warn_traditional;
514 /* Nonzero means warn about sizeof(function) or addition/subtraction
515 of function pointers. */
517 int warn_pointer_arith;
519 /* Nonzero means warn for non-prototype function decls
520 or non-prototyped defs without previous prototype. */
522 int warn_strict_prototypes;
524 /* Nonzero means warn for any global function def
525 without separate previous prototype decl. */
527 int warn_missing_prototypes;
529 /* Nonzero means warn for any global function def
530 without separate previous decl. */
532 int warn_missing_declarations;
534 /* Nonzero means warn about multiple (redundant) decls for the same single
535 variable or function. */
537 int warn_redundant_decls = 0;
539 /* Nonzero means warn about extern declarations of objects not at
540 file-scope level and about *all* declarations of functions (whether
541 extern or static) not at file-scope level. Note that we exclude
542 implicit function declarations. To get warnings about those, use
545 int warn_nested_externs = 0;
547 /* Warn about *printf or *scanf format/argument anomalies. */
551 /* Warn about a subscript that has type char. */
553 int warn_char_subscripts = 0;
555 /* Warn if a type conversion is done that might have confusing results. */
559 /* Warn if adding () is suggested. */
561 int warn_parentheses;
563 /* Warn if initializer is not completely bracketed. */
565 int warn_missing_braces;
567 /* Warn if main is suspicious. */
571 /* Warn about #pragma directives that are not recognised. */
573 int warn_unknown_pragmas = 0; /* Tri state variable. */
575 /* Warn about comparison of signed and unsigned values.
576 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
578 int warn_sign_compare = -1;
580 /* Nonzero means `$' can be in an identifier. */
582 #ifndef DOLLARS_IN_IDENTIFIERS
583 #define DOLLARS_IN_IDENTIFIERS 1
585 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
587 /* Decode the string P as a language-specific option for C.
588 Return the number of strings consumed. */
591 c_decode_option (argc, argv)
595 int strings_processed;
598 if (! cpp_initialized)
600 cpp_reader_init (&parse_in);
601 parse_in.data = &parse_options;
602 cpp_options_init (&parse_options);
605 strings_processed = cpp_handle_option (&parse_in, argc, argv);
607 strings_processed = 0;
608 #endif /* ! USE_CPPLIB */
610 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
612 flag_traditional = 1;
613 flag_writable_strings = 1;
615 else if (!strcmp (p, "-fallow-single-precision"))
616 flag_allow_single_precision = 1;
617 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
622 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
626 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
630 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
632 flag_traditional = 0;
633 flag_writable_strings = 0;
635 else if (!strcmp (p, "-fdollars-in-identifiers"))
636 dollars_in_ident = 1;
637 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
638 dollars_in_ident = 0;
639 else if (!strcmp (p, "-fsigned-char"))
640 flag_signed_char = 1;
641 else if (!strcmp (p, "-funsigned-char"))
642 flag_signed_char = 0;
643 else if (!strcmp (p, "-fno-signed-char"))
644 flag_signed_char = 0;
645 else if (!strcmp (p, "-fno-unsigned-char"))
646 flag_signed_char = 1;
647 else if (!strcmp (p, "-fsigned-bitfields")
648 || !strcmp (p, "-fno-unsigned-bitfields"))
650 flag_signed_bitfields = 1;
651 explicit_flag_signed_bitfields = 1;
653 else if (!strcmp (p, "-funsigned-bitfields")
654 || !strcmp (p, "-fno-signed-bitfields"))
656 flag_signed_bitfields = 0;
657 explicit_flag_signed_bitfields = 1;
659 else if (!strcmp (p, "-fshort-enums"))
660 flag_short_enums = 1;
661 else if (!strcmp (p, "-fno-short-enums"))
662 flag_short_enums = 0;
663 else if (!strcmp (p, "-fcond-mismatch"))
664 flag_cond_mismatch = 1;
665 else if (!strcmp (p, "-fno-cond-mismatch"))
666 flag_cond_mismatch = 0;
667 else if (!strcmp (p, "-fshort-double"))
668 flag_short_double = 1;
669 else if (!strcmp (p, "-fno-short-double"))
670 flag_short_double = 0;
671 else if (!strcmp (p, "-fasm"))
673 else if (!strcmp (p, "-fno-asm"))
675 else if (!strcmp (p, "-fbuiltin"))
677 else if (!strcmp (p, "-fno-builtin"))
679 else if (!strcmp (p, "-fno-ident"))
681 else if (!strcmp (p, "-fident"))
683 else if (!strcmp (p, "-ansi"))
684 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
685 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
686 mesg_implicit_function_declaration = 2;
687 else if (!strcmp (p, "-Wimplicit-function-declaration"))
688 mesg_implicit_function_declaration = 1;
689 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
690 mesg_implicit_function_declaration = 0;
691 else if (!strcmp (p, "-Wimplicit-int"))
692 warn_implicit_int = 1;
693 else if (!strcmp (p, "-Wno-implicit-int"))
694 warn_implicit_int = 0;
695 else if (!strcmp (p, "-Wimplicit"))
697 warn_implicit_int = 1;
698 if (mesg_implicit_function_declaration != 2)
699 mesg_implicit_function_declaration = 1;
701 else if (!strcmp (p, "-Wno-implicit"))
702 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
703 else if (!strcmp (p, "-Wwrite-strings"))
704 warn_write_strings = 1;
705 else if (!strcmp (p, "-Wno-write-strings"))
706 warn_write_strings = 0;
707 else if (!strcmp (p, "-Wcast-qual"))
709 else if (!strcmp (p, "-Wno-cast-qual"))
711 else if (!strcmp (p, "-Wbad-function-cast"))
712 warn_bad_function_cast = 1;
713 else if (!strcmp (p, "-Wno-bad-function-cast"))
714 warn_bad_function_cast = 0;
715 else if (!strcmp (p, "-Wpointer-arith"))
716 warn_pointer_arith = 1;
717 else if (!strcmp (p, "-Wno-pointer-arith"))
718 warn_pointer_arith = 0;
719 else if (!strcmp (p, "-Wstrict-prototypes"))
720 warn_strict_prototypes = 1;
721 else if (!strcmp (p, "-Wno-strict-prototypes"))
722 warn_strict_prototypes = 0;
723 else if (!strcmp (p, "-Wmissing-prototypes"))
724 warn_missing_prototypes = 1;
725 else if (!strcmp (p, "-Wno-missing-prototypes"))
726 warn_missing_prototypes = 0;
727 else if (!strcmp (p, "-Wmissing-declarations"))
728 warn_missing_declarations = 1;
729 else if (!strcmp (p, "-Wno-missing-declarations"))
730 warn_missing_declarations = 0;
731 else if (!strcmp (p, "-Wredundant-decls"))
732 warn_redundant_decls = 1;
733 else if (!strcmp (p, "-Wno-redundant-decls"))
734 warn_redundant_decls = 0;
735 else if (!strcmp (p, "-Wnested-externs"))
736 warn_nested_externs = 1;
737 else if (!strcmp (p, "-Wno-nested-externs"))
738 warn_nested_externs = 0;
739 else if (!strcmp (p, "-Wtraditional"))
740 warn_traditional = 1;
741 else if (!strcmp (p, "-Wno-traditional"))
742 warn_traditional = 0;
743 else if (!strcmp (p, "-Wformat"))
745 else if (!strcmp (p, "-Wno-format"))
747 else if (!strcmp (p, "-Wchar-subscripts"))
748 warn_char_subscripts = 1;
749 else if (!strcmp (p, "-Wno-char-subscripts"))
750 warn_char_subscripts = 0;
751 else if (!strcmp (p, "-Wconversion"))
753 else if (!strcmp (p, "-Wno-conversion"))
755 else if (!strcmp (p, "-Wparentheses"))
756 warn_parentheses = 1;
757 else if (!strcmp (p, "-Wno-parentheses"))
758 warn_parentheses = 0;
759 else if (!strcmp (p, "-Wreturn-type"))
760 warn_return_type = 1;
761 else if (!strcmp (p, "-Wno-return-type"))
762 warn_return_type = 0;
763 else if (!strcmp (p, "-Wcomment"))
764 ; /* cpp handles this one. */
765 else if (!strcmp (p, "-Wno-comment"))
766 ; /* cpp handles this one. */
767 else if (!strcmp (p, "-Wcomments"))
768 ; /* cpp handles this one. */
769 else if (!strcmp (p, "-Wno-comments"))
770 ; /* cpp handles this one. */
771 else if (!strcmp (p, "-Wtrigraphs"))
772 ; /* cpp handles this one. */
773 else if (!strcmp (p, "-Wno-trigraphs"))
774 ; /* cpp handles this one. */
775 else if (!strcmp (p, "-Wundef"))
776 ; /* cpp handles this one. */
777 else if (!strcmp (p, "-Wno-undef"))
778 ; /* cpp handles this one. */
779 else if (!strcmp (p, "-Wimport"))
780 ; /* cpp handles this one. */
781 else if (!strcmp (p, "-Wno-import"))
782 ; /* cpp handles this one. */
783 else if (!strcmp (p, "-Wmissing-braces"))
784 warn_missing_braces = 1;
785 else if (!strcmp (p, "-Wno-missing-braces"))
786 warn_missing_braces = 0;
787 else if (!strcmp (p, "-Wmain"))
789 else if (!strcmp (p, "-Wno-main"))
791 else if (!strcmp (p, "-Wsign-compare"))
792 warn_sign_compare = 1;
793 else if (!strcmp (p, "-Wno-sign-compare"))
794 warn_sign_compare = 0;
795 else if (!strcmp (p, "-Wunknown-pragmas"))
796 /* Set to greater than 1, so that even unknown pragmas in system
797 headers will be warned about. */
798 warn_unknown_pragmas = 2;
799 else if (!strcmp (p, "-Wno-unknown-pragmas"))
800 warn_unknown_pragmas = 0;
801 else if (!strcmp (p, "-Wall"))
803 /* We save the value of warn_uninitialized, since if they put
804 -Wuninitialized on the command line, we need to generate a
805 warning about not using it without also specifying -O. */
806 if (warn_uninitialized != 1)
807 warn_uninitialized = 2;
808 warn_implicit_int = 1;
809 mesg_implicit_function_declaration = 1;
810 warn_return_type = 1;
814 warn_char_subscripts = 1;
815 warn_parentheses = 1;
816 warn_missing_braces = 1;
817 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
818 it off only if it's not explicit. */
820 /* Only warn about unknown pragmas that are not in system headers. */
821 warn_unknown_pragmas = 1;
824 return strings_processed;
829 /* Hooks for print_node. */
832 print_lang_decl (file, node, indent)
833 FILE *file ATTRIBUTE_UNUSED;
834 tree node ATTRIBUTE_UNUSED;
835 int indent ATTRIBUTE_UNUSED;
840 print_lang_type (file, node, indent)
841 FILE *file ATTRIBUTE_UNUSED;
842 tree node ATTRIBUTE_UNUSED;
843 int indent ATTRIBUTE_UNUSED;
848 print_lang_identifier (file, node, indent)
853 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
854 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
855 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
856 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
857 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
858 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
861 /* Hook called at end of compilation to assume 1 elt
862 for a top-level array decl that wasn't complete before. */
865 finish_incomplete_decl (decl)
868 if (TREE_CODE (decl) == VAR_DECL)
870 tree type = TREE_TYPE (decl);
871 if (type != error_mark_node
872 && TREE_CODE (type) == ARRAY_TYPE
873 && TYPE_DOMAIN (type) == 0)
875 if (! DECL_EXTERNAL (decl))
876 warning_with_decl (decl, "array `%s' assumed to have one element");
878 complete_array_type (type, NULL_TREE, 1);
880 layout_decl (decl, 0);
885 /* Create a new `struct binding_level'. */
888 struct binding_level *
889 make_binding_level ()
892 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
895 /* Nonzero if we are currently in the global binding level. */
900 return current_binding_level == global_binding_level;
906 keep_next_level_flag = 1;
909 /* Nonzero if the current level needs to have a BLOCK made. */
914 return ((current_binding_level->keep_if_subblocks
915 && current_binding_level->blocks != 0)
916 || current_binding_level->keep
917 || current_binding_level->names != 0
918 || (current_binding_level->tags != 0
919 && !current_binding_level->tag_transparent));
922 /* Identify this binding level as a level of parameters.
923 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
924 But it turns out there is no way to pass the right value for
925 DEFINITION_FLAG, so we ignore it. */
928 declare_parm_level (definition_flag)
931 current_binding_level->parm_flag = 1;
934 /* Nonzero if currently making parm declarations. */
939 return current_binding_level->parm_flag;
942 /* Enter a new binding level.
943 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
944 not for that of tags. */
947 pushlevel (tag_transparent)
950 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
952 /* If this is the top level of a function,
953 just make sure that NAMED_LABELS is 0. */
955 if (current_binding_level == global_binding_level)
960 /* Reuse or create a struct for this binding level. */
962 if (free_binding_level)
964 newlevel = free_binding_level;
965 free_binding_level = free_binding_level->level_chain;
969 newlevel = make_binding_level ();
972 /* Add this level to the front of the chain (stack) of levels that
975 *newlevel = clear_binding_level;
976 newlevel->tag_transparent
978 || (current_binding_level
979 ? current_binding_level->subblocks_tag_transparent
981 newlevel->level_chain = current_binding_level;
982 current_binding_level = newlevel;
983 newlevel->keep = keep_next_level_flag;
984 keep_next_level_flag = 0;
985 newlevel->keep_if_subblocks = keep_next_if_subblocks;
986 keep_next_if_subblocks = 0;
989 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
992 clear_limbo_values (block)
997 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
998 if (DECL_NAME (tem) != 0)
999 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1001 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1002 clear_limbo_values (tem);
1005 /* Exit a binding level.
1006 Pop the level off, and restore the state of the identifier-decl mappings
1007 that were in effect when this level was entered.
1009 If KEEP is nonzero, this level had explicit declarations, so
1010 and create a "block" (a BLOCK node) for the level
1011 to record its declarations and subblocks for symbol table output.
1013 If FUNCTIONBODY is nonzero, this level is the body of a function,
1014 so create a block as if KEEP were set and also clear out all
1017 If REVERSE is nonzero, reverse the order of decls before putting
1018 them into the BLOCK. */
1021 poplevel (keep, reverse, functionbody)
1027 /* The chain of decls was accumulated in reverse order.
1028 Put it into forward order, just for cleanliness. */
1030 tree tags = current_binding_level->tags;
1031 tree subblocks = current_binding_level->blocks;
1034 int block_previously_created;
1036 keep |= current_binding_level->keep;
1038 /* This warning is turned off because it causes warnings for
1039 declarations like `extern struct foo *x'. */
1041 /* Warn about incomplete structure types in this level. */
1042 for (link = tags; link; link = TREE_CHAIN (link))
1043 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1045 tree type = TREE_VALUE (link);
1047 switch (TREE_CODE (type))
1050 errmsg = "`struct %s' incomplete in scope ending here";
1053 errmsg = "`union %s' incomplete in scope ending here";
1056 errmsg = "`enum %s' incomplete in scope ending here";
1059 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1060 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1062 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1063 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1067 /* Get the decls in the order they were written.
1068 Usually current_binding_level->names is in reverse order.
1069 But parameter decls were previously put in forward order. */
1072 current_binding_level->names
1073 = decls = nreverse (current_binding_level->names);
1075 decls = current_binding_level->names;
1077 /* Output any nested inline functions within this block
1078 if they weren't already output. */
1080 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1081 if (TREE_CODE (decl) == FUNCTION_DECL
1082 && ! TREE_ASM_WRITTEN (decl)
1083 && DECL_INITIAL (decl) != 0
1084 && TREE_ADDRESSABLE (decl))
1086 /* If this decl was copied from a file-scope decl
1087 on account of a block-scope extern decl,
1088 propagate TREE_ADDRESSABLE to the file-scope decl.
1090 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1091 true, since then the decl goes through save_for_inline_copying. */
1092 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1093 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1094 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1095 else if (DECL_SAVED_INSNS (decl) != 0)
1097 push_function_context ();
1098 output_inline_function (decl);
1099 pop_function_context ();
1103 /* If there were any declarations or structure tags in that level,
1104 or if this level is a function body,
1105 create a BLOCK to record them for the life of this function. */
1108 block_previously_created = (current_binding_level->this_block != 0);
1109 if (block_previously_created)
1110 block = current_binding_level->this_block;
1111 else if (keep || functionbody
1112 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1113 block = make_node (BLOCK);
1116 BLOCK_VARS (block) = decls;
1117 BLOCK_TYPE_TAGS (block) = tags;
1118 BLOCK_SUBBLOCKS (block) = subblocks;
1119 remember_end_note (block);
1122 /* In each subblock, record that this is its superior. */
1124 for (link = subblocks; link; link = TREE_CHAIN (link))
1125 BLOCK_SUPERCONTEXT (link) = block;
1127 /* Clear out the meanings of the local variables of this level. */
1129 for (link = decls; link; link = TREE_CHAIN (link))
1131 if (DECL_NAME (link) != 0)
1133 /* If the ident. was used or addressed via a local extern decl,
1134 don't forget that fact. */
1135 if (DECL_EXTERNAL (link))
1137 if (TREE_USED (link))
1138 TREE_USED (DECL_NAME (link)) = 1;
1139 if (TREE_ADDRESSABLE (link))
1140 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1142 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1146 /* Restore all name-meanings of the outer levels
1147 that were shadowed by this level. */
1149 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1150 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1152 /* If the level being exited is the top level of a function,
1153 check over all the labels, and clear out the current
1154 (function local) meanings of their names. */
1158 clear_limbo_values (block);
1160 /* If this is the top level block of a function,
1161 the vars are the function's parameters.
1162 Don't leave them in the BLOCK because they are
1163 found in the FUNCTION_DECL instead. */
1165 BLOCK_VARS (block) = 0;
1167 /* Clear out the definitions of all label names,
1168 since their scopes end here,
1169 and add them to BLOCK_VARS. */
1171 for (link = named_labels; link; link = TREE_CHAIN (link))
1173 register tree label = TREE_VALUE (link);
1175 if (DECL_INITIAL (label) == 0)
1177 error_with_decl (label, "label `%s' used but not defined");
1178 /* Avoid crashing later. */
1179 define_label (input_filename, lineno,
1182 else if (warn_unused && !TREE_USED (label))
1183 warning_with_decl (label, "label `%s' defined but not used");
1184 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1186 /* Put the labels into the "variables" of the
1187 top-level block, so debugger can see them. */
1188 TREE_CHAIN (label) = BLOCK_VARS (block);
1189 BLOCK_VARS (block) = label;
1193 /* Pop the current level, and free the structure for reuse. */
1196 register struct binding_level *level = current_binding_level;
1197 current_binding_level = current_binding_level->level_chain;
1199 level->level_chain = free_binding_level;
1200 free_binding_level = level;
1203 /* Dispose of the block that we just made inside some higher level. */
1205 DECL_INITIAL (current_function_decl) = block;
1208 if (!block_previously_created)
1209 current_binding_level->blocks
1210 = chainon (current_binding_level->blocks, block);
1212 /* If we did not make a block for the level just exited,
1213 any blocks made for inner levels
1214 (since they cannot be recorded as subblocks in that level)
1215 must be carried forward so they will later become subblocks
1216 of something else. */
1218 current_binding_level->blocks
1219 = chainon (current_binding_level->blocks, subblocks);
1221 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1222 binding contour so that they point to the appropriate construct, i.e.
1223 either to the current FUNCTION_DECL node, or else to the BLOCK node
1224 we just constructed.
1226 Note that for tagged types whose scope is just the formal parameter
1227 list for some function type specification, we can't properly set
1228 their TYPE_CONTEXTs here, because we don't have a pointer to the
1229 appropriate FUNCTION_TYPE node readily available to us. For those
1230 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1231 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1232 node which will represent the "scope" for these "parameter list local"
1237 for (link = tags; link; link = TREE_CHAIN (link))
1238 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1240 for (link = tags; link; link = TREE_CHAIN (link))
1241 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1244 TREE_USED (block) = 1;
1248 /* Delete the node BLOCK from the current binding level.
1249 This is used for the block inside a stmt expr ({...})
1250 so that the block can be reinserted where appropriate. */
1253 delete_block (block)
1257 if (current_binding_level->blocks == block)
1258 current_binding_level->blocks = TREE_CHAIN (block);
1259 for (t = current_binding_level->blocks; t;)
1261 if (TREE_CHAIN (t) == block)
1262 TREE_CHAIN (t) = TREE_CHAIN (block);
1266 TREE_CHAIN (block) = NULL;
1267 /* Clear TREE_USED which is always set by poplevel.
1268 The flag is set again if insert_block is called. */
1269 TREE_USED (block) = 0;
1272 /* Insert BLOCK at the end of the list of subblocks of the
1273 current binding level. This is used when a BIND_EXPR is expanded,
1274 to handle the BLOCK node inside the BIND_EXPR. */
1277 insert_block (block)
1280 TREE_USED (block) = 1;
1281 current_binding_level->blocks
1282 = chainon (current_binding_level->blocks, block);
1285 /* Set the BLOCK node for the innermost scope
1286 (the one we are currently in). */
1290 register tree block;
1292 current_binding_level->this_block = block;
1298 register struct binding_level *newlevel;
1300 /* Reuse or create a struct for this binding level. */
1302 if (free_binding_level)
1304 newlevel = free_binding_level;
1305 free_binding_level = free_binding_level->level_chain;
1309 newlevel = make_binding_level ();
1312 /* Add this level to the front of the chain (stack) of label levels. */
1314 newlevel->level_chain = label_level_chain;
1315 label_level_chain = newlevel;
1317 newlevel->names = named_labels;
1318 newlevel->shadowed = shadowed_labels;
1320 shadowed_labels = 0;
1326 register struct binding_level *level = label_level_chain;
1329 /* Clear out the definitions of the declared labels in this level.
1330 Leave in the list any ordinary, non-declared labels. */
1331 for (link = named_labels, prev = 0; link;)
1333 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1335 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1337 error_with_decl (TREE_VALUE (link),
1338 "label `%s' used but not defined");
1339 /* Avoid crashing later. */
1340 define_label (input_filename, lineno,
1341 DECL_NAME (TREE_VALUE (link)));
1343 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1344 warning_with_decl (TREE_VALUE (link),
1345 "label `%s' defined but not used");
1346 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1348 /* Delete this element from the list. */
1349 link = TREE_CHAIN (link);
1351 TREE_CHAIN (prev) = link;
1353 named_labels = link;
1358 link = TREE_CHAIN (link);
1362 /* Bring back all the labels that were shadowed. */
1363 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1364 if (DECL_NAME (TREE_VALUE (link)) != 0)
1365 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1366 = TREE_VALUE (link);
1368 named_labels = chainon (named_labels, level->names);
1369 shadowed_labels = level->shadowed;
1371 /* Pop the current level, and free the structure for reuse. */
1372 label_level_chain = label_level_chain->level_chain;
1373 level->level_chain = free_binding_level;
1374 free_binding_level = level;
1377 /* Push a definition or a declaration of struct, union or enum tag "name".
1378 "type" should be the type node.
1379 We assume that the tag "name" is not already defined.
1381 Note that the definition may really be just a forward reference.
1382 In that case, the TYPE_SIZE will be zero. */
1385 pushtag (name, type)
1388 register struct binding_level *b;
1390 /* Find the proper binding level for this type tag. */
1392 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1397 /* Record the identifier as the type's name if it has none. */
1399 if (TYPE_NAME (type) == 0)
1400 TYPE_NAME (type) = name;
1403 if (b == global_binding_level)
1404 b->tags = perm_tree_cons (name, type, b->tags);
1406 b->tags = saveable_tree_cons (name, type, b->tags);
1408 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1409 tagged type we just added to the current binding level. This fake
1410 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1411 to output a representation of a tagged type, and it also gives
1412 us a convenient place to record the "scope start" address for the
1415 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1417 /* An approximation for now, so we can tell this is a function-scope tag.
1418 This will be updated in poplevel. */
1419 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1422 /* Handle when a new declaration NEWDECL
1423 has the same name as an old one OLDDECL
1424 in the same binding contour.
1425 Prints an error message if appropriate.
1427 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1428 Otherwise, return 0.
1430 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1431 and OLDDECL is in an outer binding level and should thus not be changed. */
1434 duplicate_decls (newdecl, olddecl, different_binding_level)
1435 register tree newdecl, olddecl;
1436 int different_binding_level;
1438 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1439 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1440 && DECL_INITIAL (newdecl) != 0);
1441 tree oldtype = TREE_TYPE (olddecl);
1442 tree newtype = TREE_TYPE (newdecl);
1445 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1446 DECL_MACHINE_ATTRIBUTES (newdecl)
1447 = merge_machine_decl_attributes (olddecl, newdecl);
1449 if (TREE_CODE (newtype) == ERROR_MARK
1450 || TREE_CODE (oldtype) == ERROR_MARK)
1453 /* New decl is completely inconsistent with the old one =>
1454 tell caller to replace the old one.
1455 This is always an error except in the case of shadowing a builtin. */
1456 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1458 if (TREE_CODE (olddecl) == FUNCTION_DECL
1459 && (DECL_BUILT_IN (olddecl)
1460 || DECL_BUILT_IN_NONANSI (olddecl)))
1462 /* If you declare a built-in or predefined function name as static,
1463 the old definition is overridden,
1464 but optionally warn this was a bad choice of name. */
1465 if (!TREE_PUBLIC (newdecl))
1469 else if (DECL_BUILT_IN (olddecl))
1470 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1472 warning_with_decl (newdecl, "shadowing library function `%s'");
1474 /* Likewise, if the built-in is not ansi, then programs can
1475 override it even globally without an error. */
1476 else if (! DECL_BUILT_IN (olddecl))
1477 warning_with_decl (newdecl,
1478 "library function `%s' declared as non-function");
1480 else if (DECL_BUILT_IN_NONANSI (olddecl))
1481 warning_with_decl (newdecl,
1482 "built-in function `%s' declared as non-function");
1484 warning_with_decl (newdecl,
1485 "built-in function `%s' declared as non-function");
1489 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1490 error_with_decl (olddecl, "previous declaration of `%s'");
1496 /* For real parm decl following a forward decl,
1497 return 1 so old decl will be reused. */
1498 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1499 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1502 /* The new declaration is the same kind of object as the old one.
1503 The declarations may partially match. Print warnings if they don't
1504 match enough. Ultimately, copy most of the information from the new
1505 decl to the old one, and keep using the old one. */
1507 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1508 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1509 && DECL_INITIAL (olddecl) == 0)
1510 /* If -traditional, avoid error for redeclaring fcn
1511 after implicit decl. */
1513 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1514 && DECL_BUILT_IN (olddecl))
1516 /* A function declaration for a built-in function. */
1517 if (!TREE_PUBLIC (newdecl))
1519 /* If you declare a built-in function name as static, the
1520 built-in definition is overridden,
1521 but optionally warn this was a bad choice of name. */
1523 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1524 /* Discard the old built-in function. */
1527 else if (!types_match)
1529 /* Accept the return type of the new declaration if same modes. */
1530 tree oldreturntype = TREE_TYPE (oldtype);
1531 tree newreturntype = TREE_TYPE (newtype);
1533 /* Make sure we put the new type in the same obstack as the old ones.
1534 If the old types are not both in the same obstack, use the
1536 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1537 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1540 push_obstacks_nochange ();
1541 end_temporary_allocation ();
1544 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1546 /* Function types may be shared, so we can't just modify
1547 the return type of olddecl's function type. */
1549 = build_function_type (newreturntype,
1550 TYPE_ARG_TYPES (oldtype));
1552 types_match = comptypes (newtype, trytype);
1556 /* Accept harmless mismatch in first argument type also.
1558 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1559 && TYPE_ARG_TYPES (oldtype) != 0
1560 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1561 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1562 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1563 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1565 /* Function types may be shared, so we can't just modify
1566 the return type of olddecl's function type. */
1568 = build_function_type (TREE_TYPE (oldtype),
1569 tree_cons (NULL_TREE,
1570 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1571 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1573 types_match = comptypes (newtype, trytype);
1577 if (! different_binding_level)
1578 TREE_TYPE (olddecl) = oldtype;
1584 /* If types don't match for a built-in, throw away the built-in. */
1585 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1589 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1590 && DECL_SOURCE_LINE (olddecl) == 0)
1592 /* A function declaration for a predeclared function
1593 that isn't actually built in. */
1594 if (!TREE_PUBLIC (newdecl))
1596 /* If you declare it as static, the
1597 default definition is overridden. */
1600 else if (!types_match)
1602 /* If the types don't match, preserve volatility indication.
1603 Later on, we will discard everything else about the
1604 default declaration. */
1605 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1608 /* Permit char *foo () to match void *foo (...) if not pedantic,
1609 if one of them came from a system header file. */
1610 else if (!types_match
1611 && TREE_CODE (olddecl) == FUNCTION_DECL
1612 && TREE_CODE (newdecl) == FUNCTION_DECL
1613 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1614 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1615 && (DECL_IN_SYSTEM_HEADER (olddecl)
1616 || DECL_IN_SYSTEM_HEADER (newdecl))
1617 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1618 && TYPE_ARG_TYPES (oldtype) == 0
1619 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1620 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1622 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1623 && TYPE_ARG_TYPES (newtype) == 0
1624 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1625 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1628 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1629 /* Make sure we keep void * as ret type, not char *. */
1630 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1631 TREE_TYPE (newdecl) = newtype = oldtype;
1633 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1634 we will come back here again. */
1635 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1637 else if (!types_match
1638 /* Permit char *foo (int, ...); followed by char *foo ();
1640 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1642 /* Return types must still match. */
1643 && comptypes (TREE_TYPE (oldtype),
1644 TREE_TYPE (newtype))
1645 && TYPE_ARG_TYPES (newtype) == 0))
1647 error_with_decl (newdecl, "conflicting types for `%s'");
1648 /* Check for function type mismatch
1649 involving an empty arglist vs a nonempty one. */
1650 if (TREE_CODE (olddecl) == FUNCTION_DECL
1651 && comptypes (TREE_TYPE (oldtype),
1652 TREE_TYPE (newtype))
1653 && ((TYPE_ARG_TYPES (oldtype) == 0
1654 && DECL_INITIAL (olddecl) == 0)
1656 (TYPE_ARG_TYPES (newtype) == 0
1657 && DECL_INITIAL (newdecl) == 0)))
1659 /* Classify the problem further. */
1660 register tree t = TYPE_ARG_TYPES (oldtype);
1662 t = TYPE_ARG_TYPES (newtype);
1663 for (; t; t = TREE_CHAIN (t))
1665 register tree type = TREE_VALUE (t);
1667 if (TREE_CHAIN (t) == 0
1668 && TYPE_MAIN_VARIANT (type) != void_type_node)
1670 error ("A parameter list with an ellipsis can't match");
1671 error ("an empty parameter name list declaration.");
1675 if (TYPE_MAIN_VARIANT (type) == float_type_node
1676 || C_PROMOTING_INTEGER_TYPE_P (type))
1678 error ("An argument type that has a default promotion");
1679 error ("can't match an empty parameter name list declaration.");
1684 error_with_decl (olddecl, "previous declaration of `%s'");
1688 errmsg = redeclaration_error_message (newdecl, olddecl);
1691 error_with_decl (newdecl, errmsg);
1692 error_with_decl (olddecl,
1693 ((DECL_INITIAL (olddecl)
1694 && current_binding_level == global_binding_level)
1695 ? "`%s' previously defined here"
1696 : "`%s' previously declared here"));
1698 else if (TREE_CODE (newdecl) == TYPE_DECL
1699 && (DECL_IN_SYSTEM_HEADER (olddecl)
1700 || DECL_IN_SYSTEM_HEADER (newdecl)))
1702 warning_with_decl (newdecl, "redefinition of `%s'");
1705 ((DECL_INITIAL (olddecl)
1706 && current_binding_level == global_binding_level)
1707 ? "`%s' previously defined here"
1708 : "`%s' previously declared here"));
1710 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1711 && DECL_INITIAL (olddecl) != 0
1712 && TYPE_ARG_TYPES (oldtype) == 0
1713 && TYPE_ARG_TYPES (newtype) != 0
1714 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1716 register tree type, parm;
1718 /* Prototype decl follows defn w/o prototype. */
1720 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1721 type = TYPE_ARG_TYPES (newtype),
1723 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1724 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1725 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1727 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1728 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1730 errmsg = "prototype for `%s' follows and number of arguments";
1733 /* Type for passing arg must be consistent
1734 with that declared for the arg. */
1735 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1736 /* If -traditional, allow `unsigned int' instead of `int'
1737 in the prototype. */
1738 && (! (flag_traditional
1739 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1740 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1742 errmsg = "prototype for `%s' follows and argument %d";
1748 error_with_decl (newdecl, errmsg, nargs);
1749 error_with_decl (olddecl,
1750 "doesn't match non-prototype definition here");
1754 warning_with_decl (newdecl, "prototype for `%s' follows");
1755 warning_with_decl (olddecl, "non-prototype definition here");
1758 /* Warn about mismatches in various flags. */
1761 /* Warn if function is now inline
1762 but was previously declared not inline and has been called. */
1763 if (TREE_CODE (olddecl) == FUNCTION_DECL
1764 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1765 && TREE_USED (olddecl))
1766 warning_with_decl (newdecl,
1767 "`%s' declared inline after being called");
1768 if (TREE_CODE (olddecl) == FUNCTION_DECL
1769 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1770 && DECL_INITIAL (olddecl) != 0)
1771 warning_with_decl (newdecl,
1772 "`%s' declared inline after its definition");
1774 /* If pedantic, warn when static declaration follows a non-static
1775 declaration. Otherwise, do so only for functions. */
1776 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1777 && TREE_PUBLIC (olddecl)
1778 && !TREE_PUBLIC (newdecl))
1779 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1781 /* Warn when const declaration follows a non-const
1782 declaration, but not for functions. */
1783 if (TREE_CODE (olddecl) != FUNCTION_DECL
1784 && !TREE_READONLY (olddecl)
1785 && TREE_READONLY (newdecl))
1786 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1787 /* These bits are logically part of the type, for variables.
1788 But not for functions
1789 (where qualifiers are not valid ANSI anyway). */
1790 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1791 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1792 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1793 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1797 /* Optionally warn about more than one declaration for the same name. */
1798 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1799 /* Don't warn about a function declaration
1800 followed by a definition. */
1801 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1802 && DECL_INITIAL (olddecl) == 0)
1803 /* Don't warn about extern decl followed by (tentative) definition. */
1804 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1806 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1807 warning_with_decl (olddecl, "previous declaration of `%s'");
1810 /* Copy all the DECL_... slots specified in the new decl
1811 except for any that we copy here from the old type.
1813 Past this point, we don't change OLDTYPE and NEWTYPE
1814 even if we change the types of NEWDECL and OLDDECL. */
1818 /* When copying info to olddecl, we store into write_olddecl
1819 instead. This allows us to avoid modifying olddecl when
1820 different_binding_level is true. */
1821 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1823 /* Make sure we put the new type in the same obstack as the old ones.
1824 If the old types are not both in the same obstack, use the permanent
1826 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1827 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1830 push_obstacks_nochange ();
1831 end_temporary_allocation ();
1834 /* Merge the data types specified in the two decls. */
1835 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1837 if (different_binding_level)
1839 = build_type_attribute_variant
1841 merge_attributes (TYPE_ATTRIBUTES (newtype),
1842 TYPE_ATTRIBUTES (oldtype)));
1845 = TREE_TYPE (olddecl)
1846 = common_type (newtype, oldtype);
1849 /* Lay the type out, unless already done. */
1850 if (oldtype != TREE_TYPE (newdecl))
1852 if (TREE_TYPE (newdecl) != error_mark_node)
1853 layout_type (TREE_TYPE (newdecl));
1854 if (TREE_CODE (newdecl) != FUNCTION_DECL
1855 && TREE_CODE (newdecl) != TYPE_DECL
1856 && TREE_CODE (newdecl) != CONST_DECL)
1857 layout_decl (newdecl, 0);
1861 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1862 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1863 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1864 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1865 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1868 /* Keep the old rtl since we can safely use it. */
1869 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1871 /* Merge the type qualifiers. */
1872 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1873 && !TREE_THIS_VOLATILE (newdecl))
1874 TREE_THIS_VOLATILE (write_olddecl) = 0;
1875 if (TREE_READONLY (newdecl))
1876 TREE_READONLY (write_olddecl) = 1;
1877 if (TREE_THIS_VOLATILE (newdecl))
1879 TREE_THIS_VOLATILE (write_olddecl) = 1;
1880 if (TREE_CODE (newdecl) == VAR_DECL)
1881 make_var_volatile (newdecl);
1884 /* Keep source location of definition rather than declaration. */
1885 /* When called with different_binding_level set, keep the old
1886 information so that meaningful diagnostics can be given. */
1887 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1888 && ! different_binding_level)
1890 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1891 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1894 /* Merge the unused-warning information. */
1895 if (DECL_IN_SYSTEM_HEADER (olddecl))
1896 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1897 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1898 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1900 /* Merge the initialization information. */
1901 /* When called with different_binding_level set, don't copy over
1902 DECL_INITIAL, so that we don't accidentally change function
1903 declarations into function definitions. */
1904 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1905 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1907 /* Merge the section attribute.
1908 We want to issue an error if the sections conflict but that must be
1909 done later in decl_attributes since we are called before attributes
1911 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1912 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1914 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1916 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1917 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1922 /* If cannot merge, then use the new type and qualifiers,
1923 and don't preserve the old rtl. */
1924 else if (! different_binding_level)
1926 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1927 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1928 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1929 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1932 /* Merge the storage class information. */
1933 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1934 /* For functions, static overrides non-static. */
1935 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1937 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1938 /* This is since we don't automatically
1939 copy the attributes of NEWDECL into OLDDECL. */
1940 /* No need to worry about different_binding_level here because
1941 then TREE_PUBLIC (newdecl) was true. */
1942 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1943 /* If this clears `static', clear it in the identifier too. */
1944 if (! TREE_PUBLIC (olddecl))
1945 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1947 if (DECL_EXTERNAL (newdecl))
1949 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1950 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1951 /* An extern decl does not override previous storage class. */
1952 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1953 if (! DECL_EXTERNAL (newdecl))
1954 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1958 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1959 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1962 /* If either decl says `inline', this fn is inline,
1963 unless its definition was passed already. */
1964 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1965 DECL_INLINE (olddecl) = 1;
1966 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1968 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1970 if (DECL_BUILT_IN (olddecl))
1972 /* Get rid of any built-in function if new arg types don't match it
1973 or if we have a function definition. */
1974 if (! types_match || new_is_definition)
1976 if (! different_binding_level)
1978 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1979 DECL_BUILT_IN (olddecl) = 0;
1984 /* If redeclaring a builtin function, and not a definition,
1985 it stays built in. */
1986 DECL_BUILT_IN (newdecl) = 1;
1987 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1990 /* Also preserve various other info from the definition. */
1991 else if (! new_is_definition)
1992 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1993 if (! new_is_definition)
1995 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1996 /* When called with different_binding_level set, don't copy over
1997 DECL_INITIAL, so that we don't accidentally change function
1998 declarations into function definitions. */
1999 if (! different_binding_level)
2000 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2001 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2002 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2003 if (DECL_INLINE (newdecl))
2004 DECL_ABSTRACT_ORIGIN (newdecl) = olddecl;
2007 if (different_binding_level)
2009 /* Don't output a duplicate symbol or debugging information for this
2012 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2013 just have two declarations without a definition. VAR_DECLs may need
2014 the same treatment, I'm not sure. */
2015 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2016 DECL_IGNORED_P (newdecl) = 1;
2018 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2022 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2023 But preserve OLDDECL's DECL_UID. */
2025 register unsigned olddecl_uid = DECL_UID (olddecl);
2027 bcopy ((char *) newdecl + sizeof (struct tree_common),
2028 (char *) olddecl + sizeof (struct tree_common),
2029 sizeof (struct tree_decl) - sizeof (struct tree_common));
2030 DECL_UID (olddecl) = olddecl_uid;
2033 /* NEWDECL contains the merged attribute lists.
2034 Update OLDDECL to be the same. */
2035 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2040 /* Record a decl-node X as belonging to the current lexical scope.
2041 Check for errors (such as an incompatible declaration for the same
2042 name already seen in the same scope).
2044 Returns either X or an old decl for the same name.
2045 If an old decl is returned, it may have been smashed
2046 to agree with what X says. */
2053 register tree name = DECL_NAME (x);
2054 register struct binding_level *b = current_binding_level;
2056 DECL_CONTEXT (x) = current_function_decl;
2057 /* A local extern declaration for a function doesn't constitute nesting.
2058 A local auto declaration does, since it's a forward decl
2059 for a nested function coming later. */
2060 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2061 && DECL_EXTERNAL (x))
2062 DECL_CONTEXT (x) = 0;
2064 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2065 && x != IDENTIFIER_IMPLICIT_DECL (name)
2066 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2067 && !DECL_IN_SYSTEM_HEADER (x))
2068 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2074 int different_binding_level = 0;
2076 t = lookup_name_current_level (name);
2077 /* Don't type check externs here when -traditional. This is so that
2078 code with conflicting declarations inside blocks will get warnings
2079 not errors. X11 for instance depends on this. */
2080 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2082 t = IDENTIFIER_GLOBAL_VALUE (name);
2083 /* Type decls at global scope don't conflict with externs declared
2084 inside lexical blocks. */
2085 if (t && TREE_CODE (t) == TYPE_DECL)
2087 different_binding_level = 1;
2089 if (t != 0 && t == error_mark_node)
2090 /* error_mark_node is 0 for a while during initialization! */
2093 error_with_decl (x, "`%s' used prior to declaration");
2098 file = DECL_SOURCE_FILE (t);
2099 line = DECL_SOURCE_LINE (t);
2102 /* If this decl is `static' and an implicit decl was seen previously,
2103 warn. But don't complain if -traditional,
2104 since traditional compilers don't complain. */
2105 if (! flag_traditional && TREE_PUBLIC (name)
2106 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2107 sets this for all functions. */
2108 && ! TREE_PUBLIC (x)
2109 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2110 /* We used to warn also for explicit extern followed by static,
2111 but sometimes you need to do it that way. */
2112 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2114 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2115 IDENTIFIER_POINTER (name));
2116 pedwarn_with_file_and_line
2117 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2118 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2119 "previous declaration of `%s'",
2120 IDENTIFIER_POINTER (name));
2121 TREE_THIS_VOLATILE (name) = 1;
2124 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2126 if (TREE_CODE (t) == PARM_DECL)
2128 /* Don't allow more than one "real" duplicate
2129 of a forward parm decl. */
2130 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2136 /* If we are processing a typedef statement, generate a whole new
2137 ..._TYPE node (which will be just an variant of the existing
2138 ..._TYPE node with identical properties) and then install the
2139 TYPE_DECL node generated to represent the typedef name as the
2140 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2142 The whole point here is to end up with a situation where each
2143 and every ..._TYPE node the compiler creates will be uniquely
2144 associated with AT MOST one node representing a typedef name.
2145 This way, even though the compiler substitutes corresponding
2146 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2147 early on, later parts of the compiler can always do the reverse
2148 translation and get back the corresponding typedef name. For
2151 typedef struct S MY_TYPE;
2154 Later parts of the compiler might only know that `object' was of
2155 type `struct S' if it were not for code just below. With this
2156 code however, later parts of the compiler see something like:
2158 struct S' == struct S
2159 typedef struct S' MY_TYPE;
2162 And they can then deduce (from the node for type struct S') that
2163 the original object declaration was:
2167 Being able to do this is important for proper support of protoize,
2168 and also for generating precise symbolic debugging information
2169 which takes full account of the programmer's (typedef) vocabulary.
2171 Obviously, we don't want to generate a duplicate ..._TYPE node if
2172 the TYPE_DECL node that we are now processing really represents a
2173 standard built-in type.
2175 Since all standard types are effectively declared at line zero
2176 in the source file, we can easily check to see if we are working
2177 on a standard type by checking the current value of lineno. */
2179 if (TREE_CODE (x) == TYPE_DECL)
2181 if (DECL_SOURCE_LINE (x) == 0)
2183 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2184 TYPE_NAME (TREE_TYPE (x)) = x;
2186 else if (TREE_TYPE (x) != error_mark_node
2187 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2189 tree tt = TREE_TYPE (x);
2190 DECL_ORIGINAL_TYPE (x) = tt;
2191 tt = build_type_copy (tt);
2197 /* Multiple external decls of the same identifier ought to match.
2198 Check against both global declarations (when traditional) and out of
2199 scope (limbo) block level declarations.
2201 We get warnings about inline functions where they are defined.
2202 Avoid duplicate warnings where they are used. */
2203 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2207 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2208 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2209 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2210 decl = IDENTIFIER_GLOBAL_VALUE (name);
2211 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2212 /* Decls in limbo are always extern, so no need to check that. */
2213 decl = IDENTIFIER_LIMBO_VALUE (name);
2217 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2218 /* If old decl is built-in, we already warned if we should. */
2219 && !DECL_BUILT_IN (decl))
2221 pedwarn_with_decl (x,
2222 "type mismatch with previous external decl");
2223 pedwarn_with_decl (decl, "previous external decl of `%s'");
2227 /* If a function has had an implicit declaration, and then is defined,
2228 make sure they are compatible. */
2230 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2231 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2232 && TREE_CODE (x) == FUNCTION_DECL
2233 && ! comptypes (TREE_TYPE (x),
2234 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2236 warning_with_decl (x, "type mismatch with previous implicit declaration");
2237 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2238 "previous implicit declaration of `%s'");
2241 /* In PCC-compatibility mode, extern decls of vars with no current decl
2242 take effect at top level no matter where they are. */
2243 if (flag_traditional && DECL_EXTERNAL (x)
2244 && lookup_name (name) == 0)
2246 tree type = TREE_TYPE (x);
2248 /* But don't do this if the type contains temporary nodes. */
2251 if (type == error_mark_node)
2253 if (! TREE_PERMANENT (type))
2255 warning_with_decl (x, "type of external `%s' is not global");
2256 /* By exiting the loop early, we leave TYPE nonzero,
2257 and thus prevent globalization of the decl. */
2260 else if (TREE_CODE (type) == FUNCTION_TYPE
2261 && TYPE_ARG_TYPES (type) != 0)
2262 /* The types might not be truly local,
2263 but the list of arg types certainly is temporary.
2264 Since prototypes are nontraditional,
2265 ok not to do the traditional thing. */
2267 type = TREE_TYPE (type);
2271 b = global_binding_level;
2274 /* This name is new in its binding level.
2275 Install the new declaration and return it. */
2276 if (b == global_binding_level)
2278 /* Install a global value. */
2280 /* If the first global decl has external linkage,
2281 warn if we later see static one. */
2282 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2283 TREE_PUBLIC (name) = 1;
2285 IDENTIFIER_GLOBAL_VALUE (name) = x;
2287 /* We no longer care about any previous block level declarations. */
2288 IDENTIFIER_LIMBO_VALUE (name) = 0;
2290 /* Don't forget if the function was used via an implicit decl. */
2291 if (IDENTIFIER_IMPLICIT_DECL (name)
2292 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2293 TREE_USED (x) = 1, TREE_USED (name) = 1;
2295 /* Don't forget if its address was taken in that way. */
2296 if (IDENTIFIER_IMPLICIT_DECL (name)
2297 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2298 TREE_ADDRESSABLE (x) = 1;
2300 /* Warn about mismatches against previous implicit decl. */
2301 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2302 /* If this real decl matches the implicit, don't complain. */
2303 && ! (TREE_CODE (x) == FUNCTION_DECL
2304 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2305 == integer_type_node)))
2306 pedwarn ("`%s' was previously implicitly declared to return `int'",
2307 IDENTIFIER_POINTER (name));
2309 /* If this decl is `static' and an `extern' was seen previously,
2310 that is erroneous. */
2311 if (TREE_PUBLIC (name)
2312 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2314 /* Okay to redeclare an ANSI built-in as static. */
2315 if (t != 0 && DECL_BUILT_IN (t))
2317 /* Okay to declare a non-ANSI built-in as anything. */
2318 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2320 /* Okay to have global type decl after an earlier extern
2321 declaration inside a lexical block. */
2322 else if (TREE_CODE (x) == TYPE_DECL)
2324 else if (IDENTIFIER_IMPLICIT_DECL (name))
2326 if (! TREE_THIS_VOLATILE (name))
2327 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2328 IDENTIFIER_POINTER (name));
2331 pedwarn ("`%s' was declared `extern' and later `static'",
2332 IDENTIFIER_POINTER (name));
2337 /* Here to install a non-global value. */
2338 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2339 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2340 IDENTIFIER_LOCAL_VALUE (name) = x;
2342 /* If this is an extern function declaration, see if we
2343 have a global definition or declaration for the function. */
2345 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2347 && TREE_CODE (x) == FUNCTION_DECL
2348 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2350 /* We have one. Their types must agree. */
2351 if (! comptypes (TREE_TYPE (x),
2352 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2353 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2356 /* Inner extern decl is inline if global one is.
2357 Copy enough to really inline it. */
2358 if (DECL_INLINE (oldglobal))
2360 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2361 DECL_INITIAL (x) = (current_function_decl == oldglobal
2362 ? 0 : DECL_INITIAL (oldglobal));
2363 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2364 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2365 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2366 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2367 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2368 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2370 /* Inner extern decl is built-in if global one is. */
2371 if (DECL_BUILT_IN (oldglobal))
2373 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2374 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2376 /* Keep the arg types from a file-scope fcn defn. */
2377 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2378 && DECL_INITIAL (oldglobal)
2379 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2380 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2384 #if 0 /* This case is probably sometimes the right thing to do. */
2385 /* If we have a local external declaration,
2386 then any file-scope declaration should not
2387 have been static. */
2388 if (oldlocal == 0 && oldglobal != 0
2389 && !TREE_PUBLIC (oldglobal)
2390 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2391 warning ("`%s' locally external but globally static",
2392 IDENTIFIER_POINTER (name));
2395 /* If we have a local external declaration,
2396 and no file-scope declaration has yet been seen,
2397 then if we later have a file-scope decl it must not be static. */
2399 && DECL_EXTERNAL (x)
2403 TREE_PUBLIC (name) = 1;
2405 /* Save this decl, so that we can do type checking against
2406 other decls after it falls out of scope.
2408 Only save it once. This prevents temporary decls created in
2409 expand_inline_function from being used here, since this
2410 will have been set when the inline function was parsed.
2411 It also helps give slightly better warnings. */
2412 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2413 IDENTIFIER_LIMBO_VALUE (name) = x;
2416 /* Warn if shadowing an argument at the top level of the body. */
2417 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2418 /* This warning doesn't apply to the parms of a nested fcn. */
2419 && ! current_binding_level->parm_flag
2420 /* Check that this is one level down from the parms. */
2421 && current_binding_level->level_chain->parm_flag
2422 /* Check that the decl being shadowed
2423 comes from the parm level, one level up. */
2424 && chain_member (oldlocal, current_binding_level->level_chain->names))
2426 if (TREE_CODE (oldlocal) == PARM_DECL)
2427 pedwarn ("declaration of `%s' shadows a parameter",
2428 IDENTIFIER_POINTER (name));
2430 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2431 IDENTIFIER_POINTER (name));
2434 /* Maybe warn if shadowing something else. */
2435 else if (warn_shadow && !DECL_EXTERNAL (x)
2436 /* No shadow warnings for internally generated vars. */
2437 && DECL_SOURCE_LINE (x) != 0
2438 /* No shadow warnings for vars made for inlining. */
2439 && ! DECL_FROM_INLINE (x))
2441 char *warnstring = 0;
2443 if (TREE_CODE (x) == PARM_DECL
2444 && current_binding_level->level_chain->parm_flag)
2445 /* Don't warn about the parm names in function declarator
2446 within a function declarator.
2447 It would be nice to avoid warning in any function
2448 declarator in a declaration, as opposed to a definition,
2449 but there is no way to tell it's not a definition. */
2451 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2452 warnstring = "declaration of `%s' shadows a parameter";
2453 else if (oldlocal != 0)
2454 warnstring = "declaration of `%s' shadows previous local";
2455 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2456 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2457 warnstring = "declaration of `%s' shadows global declaration";
2460 warning (warnstring, IDENTIFIER_POINTER (name));
2463 /* If storing a local value, there may already be one (inherited).
2464 If so, record it for restoration when this binding level ends. */
2466 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2469 /* Keep count of variables in this level with incomplete type. */
2470 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2474 /* Put decls on list in reverse order.
2475 We will reverse them later if necessary. */
2476 TREE_CHAIN (x) = b->names;
2482 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2485 pushdecl_top_level (x)
2489 register struct binding_level *b = current_binding_level;
2491 current_binding_level = global_binding_level;
2493 current_binding_level = b;
2497 /* Generate an implicit declaration for identifier FUNCTIONID
2498 as a function of type int (). Print a warning if appropriate. */
2501 implicitly_declare (functionid)
2505 int traditional_warning = 0;
2506 /* Only one "implicit declaration" warning per identifier. */
2507 int implicit_warning;
2509 /* Save the decl permanently so we can warn if definition follows. */
2510 push_obstacks_nochange ();
2511 end_temporary_allocation ();
2513 /* We used to reuse an old implicit decl here,
2514 but this loses with inline functions because it can clobber
2515 the saved decl chains. */
2516 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2517 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2519 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2521 /* Warn of implicit decl following explicit local extern decl.
2522 This is probably a program designed for traditional C. */
2523 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2524 traditional_warning = 1;
2526 /* Warn once of an implicit declaration. */
2527 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2529 DECL_EXTERNAL (decl) = 1;
2530 TREE_PUBLIC (decl) = 1;
2532 /* Record that we have an implicit decl and this is it. */
2533 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2535 /* ANSI standard says implicit declarations are in the innermost block.
2536 So we record the decl in the standard fashion.
2537 If flag_traditional is set, pushdecl does it top-level. */
2540 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2541 maybe_objc_check_decl (decl);
2543 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2545 if (mesg_implicit_function_declaration && implicit_warning)
2547 if (mesg_implicit_function_declaration == 2)
2548 error ("implicit declaration of function `%s'",
2549 IDENTIFIER_POINTER (functionid));
2551 warning ("implicit declaration of function `%s'",
2552 IDENTIFIER_POINTER (functionid));
2554 else if (warn_traditional && traditional_warning)
2555 warning ("function `%s' was previously declared within a block",
2556 IDENTIFIER_POINTER (functionid));
2558 /* Write a record describing this implicit function declaration to the
2559 prototypes file (if requested). */
2561 gen_aux_info_record (decl, 0, 1, 0);
2568 /* Return zero if the declaration NEWDECL is valid
2569 when the declaration OLDDECL (assumed to be for the same name)
2570 has already been seen.
2571 Otherwise return an error message format string with a %s
2572 where the identifier should go. */
2575 redeclaration_error_message (newdecl, olddecl)
2576 tree newdecl, olddecl;
2578 if (TREE_CODE (newdecl) == TYPE_DECL)
2580 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2582 /* pushdecl creates distinct types for TYPE_DECLs by calling
2583 build_type_copy, so the above comparison generally fails. We do
2584 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2585 is equivalent to what this code used to do before the build_type_copy
2586 call. The variant type distinction should not matter for traditional
2587 code, because it doesn't have type qualifiers. */
2588 if (flag_traditional
2589 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2591 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2593 return "redefinition of `%s'";
2595 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2597 /* Declarations of functions can insist on internal linkage
2598 but they can't be inconsistent with internal linkage,
2599 so there can be no error on that account.
2600 However defining the same name twice is no good. */
2601 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2602 /* However, defining once as extern inline and a second
2603 time in another way is ok. */
2604 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2605 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2606 return "redefinition of `%s'";
2609 else if (current_binding_level == global_binding_level)
2611 /* Objects declared at top level: */
2612 /* If at least one is a reference, it's ok. */
2613 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2615 /* Reject two definitions. */
2616 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2617 return "redefinition of `%s'";
2618 /* Now we have two tentative defs, or one tentative and one real def. */
2619 /* Insist that the linkage match. */
2620 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2621 return "conflicting declarations of `%s'";
2624 else if (current_binding_level->parm_flag
2625 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2629 /* Newdecl has block scope. If olddecl has block scope also, then
2630 reject two definitions, and reject a definition together with an
2631 external reference. Otherwise, it is OK, because newdecl must
2632 be an extern reference to olddecl. */
2633 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2634 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2635 return "redeclaration of `%s'";
2640 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2641 Create one if none exists so far for the current function.
2642 This function is called for both label definitions and label references. */
2648 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2650 if (current_function_decl == 0)
2652 error ("label %s referenced outside of any function",
2653 IDENTIFIER_POINTER (id));
2657 /* Use a label already defined or ref'd with this name. */
2660 /* But not if it is inherited and wasn't declared to be inheritable. */
2661 if (DECL_CONTEXT (decl) != current_function_decl
2662 && ! C_DECLARED_LABEL_FLAG (decl))
2663 return shadow_label (id);
2667 decl = build_decl (LABEL_DECL, id, void_type_node);
2669 /* Make sure every label has an rtx. */
2672 /* A label not explicitly declared must be local to where it's ref'd. */
2673 DECL_CONTEXT (decl) = current_function_decl;
2675 DECL_MODE (decl) = VOIDmode;
2677 /* Say where one reference is to the label,
2678 for the sake of the error if it is not defined. */
2679 DECL_SOURCE_LINE (decl) = lineno;
2680 DECL_SOURCE_FILE (decl) = input_filename;
2682 IDENTIFIER_LABEL_VALUE (id) = decl;
2684 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2689 /* Make a label named NAME in the current function,
2690 shadowing silently any that may be inherited from containing functions
2691 or containing scopes.
2693 Note that valid use, if the label being shadowed
2694 comes from another scope in the same function,
2695 requires calling declare_nonlocal_label right away. */
2701 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2707 /* Check to make sure that the label hasn't already been declared
2708 at this label scope */
2709 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2710 if (TREE_VALUE (dup) == decl)
2712 error ("duplicate label declaration `%s'",
2713 IDENTIFIER_POINTER (name));
2714 error_with_decl (TREE_VALUE (dup),
2715 "this is a previous declaration");
2716 /* Just use the previous declaration. */
2717 return lookup_label (name);
2720 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2721 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2724 return lookup_label (name);
2727 /* Define a label, specifying the location in the source file.
2728 Return the LABEL_DECL node for the label, if the definition is valid.
2729 Otherwise return 0. */
2732 define_label (filename, line, name)
2737 tree decl = lookup_label (name);
2739 /* If label with this name is known from an outer context, shadow it. */
2740 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2742 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2743 IDENTIFIER_LABEL_VALUE (name) = 0;
2744 decl = lookup_label (name);
2747 if (DECL_INITIAL (decl) != 0)
2749 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2754 /* Mark label as having been defined. */
2755 DECL_INITIAL (decl) = error_mark_node;
2756 /* Say where in the source. */
2757 DECL_SOURCE_FILE (decl) = filename;
2758 DECL_SOURCE_LINE (decl) = line;
2763 /* Return the list of declarations of the current level.
2764 Note that this list is in reverse order unless/until
2765 you nreverse it; and when you do nreverse it, you must
2766 store the result back using `storedecls' or you will lose. */
2771 return current_binding_level->names;
2774 /* Return the list of type-tags (for structs, etc) of the current level. */
2779 return current_binding_level->tags;
2782 /* Store the list of declarations of the current level.
2783 This is done for the parameter declarations of a function being defined,
2784 after they are modified in the light of any missing parameters. */
2790 current_binding_level->names = decls;
2793 /* Similarly, store the list of tags of the current level. */
2799 current_binding_level->tags = tags;
2802 /* Given NAME, an IDENTIFIER_NODE,
2803 return the structure (or union or enum) definition for that name.
2804 Searches binding levels from BINDING_LEVEL up to the global level.
2805 If THISLEVEL_ONLY is nonzero, searches only the specified context
2806 (but skips any tag-transparent contexts to find one that is
2807 meaningful for tags).
2808 CODE says which kind of type the caller wants;
2809 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2810 If the wrong kind of type is found, an error is reported. */
2813 lookup_tag (code, name, binding_level, thislevel_only)
2814 enum tree_code code;
2815 struct binding_level *binding_level;
2819 register struct binding_level *level;
2821 for (level = binding_level; level; level = level->level_chain)
2824 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2826 if (TREE_PURPOSE (tail) == name)
2828 if (TREE_CODE (TREE_VALUE (tail)) != code)
2830 /* Definition isn't the kind we were looking for. */
2831 pending_invalid_xref = name;
2832 pending_invalid_xref_file = input_filename;
2833 pending_invalid_xref_line = lineno;
2835 return TREE_VALUE (tail);
2838 if (thislevel_only && ! level->tag_transparent)
2844 /* Print an error message now
2845 for a recent invalid struct, union or enum cross reference.
2846 We don't print them immediately because they are not invalid
2847 when used in the `struct foo;' construct for shadowing. */
2850 pending_xref_error ()
2852 if (pending_invalid_xref != 0)
2853 error_with_file_and_line (pending_invalid_xref_file,
2854 pending_invalid_xref_line,
2855 "`%s' defined as wrong kind of tag",
2856 IDENTIFIER_POINTER (pending_invalid_xref));
2857 pending_invalid_xref = 0;
2860 /* Given a type, find the tag that was defined for it and return the tag name.
2861 Otherwise return 0. */
2864 lookup_tag_reverse (type)
2867 register struct binding_level *level;
2869 for (level = current_binding_level; level; level = level->level_chain)
2872 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2874 if (TREE_VALUE (tail) == type)
2875 return TREE_PURPOSE (tail);
2881 /* Look up NAME in the current binding level and its superiors
2882 in the namespace of variables, functions and typedefs.
2883 Return a ..._DECL node of some kind representing its definition,
2884 or return 0 if it is undefined. */
2891 if (current_binding_level != global_binding_level
2892 && IDENTIFIER_LOCAL_VALUE (name))
2893 val = IDENTIFIER_LOCAL_VALUE (name);
2895 val = IDENTIFIER_GLOBAL_VALUE (name);
2899 /* Similar to `lookup_name' but look only at current binding level. */
2902 lookup_name_current_level (name)
2907 if (current_binding_level == global_binding_level)
2908 return IDENTIFIER_GLOBAL_VALUE (name);
2910 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2913 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2914 if (DECL_NAME (t) == name)
2920 /* Create the predefined scalar types of C,
2921 and some nodes representing standard constants (0, 1, (void *) 0).
2922 Initialize the global binding level.
2923 Make definitions for built-in primitive functions. */
2926 init_decl_processing ()
2928 register tree endlink;
2929 /* Either char* or void*. */
2930 tree traditional_ptr_type_node;
2931 /* Data types of memcpy and strlen. */
2932 tree memcpy_ftype, memset_ftype, strlen_ftype;
2933 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2934 int wchar_type_size;
2936 tree array_domain_type;
2938 current_function_decl = NULL;
2939 named_labels = NULL;
2940 current_binding_level = NULL_BINDING_LEVEL;
2941 free_binding_level = NULL_BINDING_LEVEL;
2942 pushlevel (0); /* make the binding_level structure for global names */
2943 global_binding_level = current_binding_level;
2945 /* Define `int' and `char' first so that dbx will output them first. */
2947 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2948 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2949 integer_type_node));
2951 /* Define `char', which is like either `signed char' or `unsigned char'
2952 but not the same as either. */
2956 ? make_signed_type (CHAR_TYPE_SIZE)
2957 : make_unsigned_type (CHAR_TYPE_SIZE));
2958 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2961 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2962 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2963 long_integer_type_node));
2965 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2966 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2967 unsigned_type_node));
2969 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2970 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2971 long_unsigned_type_node));
2973 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2974 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2975 long_long_integer_type_node));
2977 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2979 long_long_unsigned_type_node));
2981 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2983 short_integer_type_node));
2985 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2986 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2987 short_unsigned_type_node));
2989 /* `unsigned long' is the standard type for sizeof.
2990 Traditionally, use a signed type.
2991 Note that stddef.h uses `unsigned long',
2992 and this must agree, even if long and int are the same size. */
2994 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
2995 if (flag_traditional && TREE_UNSIGNED (sizetype))
2996 set_sizetype (signed_type (sizetype));
2999 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3001 error_mark_node = make_node (ERROR_MARK);
3002 TREE_TYPE (error_mark_node) = error_mark_node;
3004 /* Define both `signed char' and `unsigned char'. */
3005 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3006 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3007 signed_char_type_node));
3009 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3010 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3011 unsigned_char_type_node));
3013 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3014 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3016 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3017 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3019 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3020 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3022 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3023 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3025 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3026 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3028 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3029 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3031 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3032 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3034 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3035 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3037 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3038 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3040 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3041 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3043 float_type_node = make_node (REAL_TYPE);
3044 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3045 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3047 layout_type (float_type_node);
3049 double_type_node = make_node (REAL_TYPE);
3050 if (flag_short_double)
3051 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3053 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3054 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3056 layout_type (double_type_node);
3058 long_double_type_node = make_node (REAL_TYPE);
3059 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3060 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3061 long_double_type_node));
3062 layout_type (long_double_type_node);
3064 complex_integer_type_node = make_node (COMPLEX_TYPE);
3065 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3066 complex_integer_type_node));
3067 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3068 layout_type (complex_integer_type_node);
3070 complex_float_type_node = make_node (COMPLEX_TYPE);
3071 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3072 complex_float_type_node));
3073 TREE_TYPE (complex_float_type_node) = float_type_node;
3074 layout_type (complex_float_type_node);
3076 complex_double_type_node = make_node (COMPLEX_TYPE);
3077 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3078 complex_double_type_node));
3079 TREE_TYPE (complex_double_type_node) = double_type_node;
3080 layout_type (complex_double_type_node);
3082 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3084 complex_long_double_type_node));
3085 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3086 layout_type (complex_long_double_type_node);
3089 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3090 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3091 signed_wchar_type_node = signed_type (wchar_type_node);
3092 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3094 integer_zero_node = build_int_2 (0, 0);
3095 TREE_TYPE (integer_zero_node) = integer_type_node;
3096 integer_one_node = build_int_2 (1, 0);
3097 TREE_TYPE (integer_one_node) = integer_type_node;
3099 boolean_type_node = integer_type_node;
3100 boolean_true_node = integer_one_node;
3101 boolean_false_node = integer_zero_node;
3103 size_zero_node = build_int_2 (0, 0);
3104 TREE_TYPE (size_zero_node) = sizetype;
3105 size_one_node = build_int_2 (1, 0);
3106 TREE_TYPE (size_one_node) = sizetype;
3108 void_type_node = make_node (VOID_TYPE);
3109 pushdecl (build_decl (TYPE_DECL,
3110 ridpointers[(int) RID_VOID], void_type_node));
3111 layout_type (void_type_node); /* Uses integer_zero_node */
3112 /* We are not going to have real types in C with less than byte alignment,
3113 so we might as well not have any types that claim to have it. */
3114 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3116 null_pointer_node = build_int_2 (0, 0);
3117 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3118 layout_type (TREE_TYPE (null_pointer_node));
3120 string_type_node = build_pointer_type (char_type_node);
3121 const_string_type_node
3122 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3124 /* Make a type to be the domain of a few array types
3125 whose domains don't really matter.
3126 200 is small enough that it always fits in size_t
3127 and large enough that it can hold most function names for the
3128 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3129 array_domain_type = build_index_type (build_int_2 (200, 0));
3131 /* make a type for arrays of characters.
3132 With luck nothing will ever really depend on the length of this
3134 char_array_type_node
3135 = build_array_type (char_type_node, array_domain_type);
3136 /* Likewise for arrays of ints. */
3138 = build_array_type (integer_type_node, array_domain_type);
3139 /* This is for wide string constants. */
3140 wchar_array_type_node
3141 = build_array_type (wchar_type_node, array_domain_type);
3143 default_function_type
3144 = build_function_type (integer_type_node, NULL_TREE);
3146 ptr_type_node = build_pointer_type (void_type_node);
3148 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3150 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3153 = build_function_type (void_type_node, NULL_TREE);
3156 = build_function_type (float_type_node,
3157 tree_cons (NULL_TREE, float_type_node, endlink));
3160 = build_function_type (double_type_node,
3161 tree_cons (NULL_TREE, double_type_node, endlink));
3163 ldouble_ftype_ldouble
3164 = build_function_type (long_double_type_node,
3165 tree_cons (NULL_TREE, long_double_type_node,
3168 double_ftype_double_double
3169 = build_function_type (double_type_node,
3170 tree_cons (NULL_TREE, double_type_node,
3171 tree_cons (NULL_TREE,
3172 double_type_node, endlink)));
3175 = build_function_type (integer_type_node,
3176 tree_cons (NULL_TREE, integer_type_node, endlink));
3179 = build_function_type (long_integer_type_node,
3180 tree_cons (NULL_TREE,
3181 long_integer_type_node, endlink));
3183 void_ftype_ptr_ptr_int
3184 = build_function_type (void_type_node,
3185 tree_cons (NULL_TREE, ptr_type_node,
3186 tree_cons (NULL_TREE, ptr_type_node,
3187 tree_cons (NULL_TREE,
3191 int_ftype_cptr_cptr_sizet
3192 = build_function_type (integer_type_node,
3193 tree_cons (NULL_TREE, const_ptr_type_node,
3194 tree_cons (NULL_TREE, const_ptr_type_node,
3195 tree_cons (NULL_TREE,
3199 void_ftype_ptr_int_int
3200 = build_function_type (void_type_node,
3201 tree_cons (NULL_TREE, ptr_type_node,
3202 tree_cons (NULL_TREE, integer_type_node,
3203 tree_cons (NULL_TREE,
3207 string_ftype_ptr_ptr /* strcpy prototype */
3208 = build_function_type (string_type_node,
3209 tree_cons (NULL_TREE, string_type_node,
3210 tree_cons (NULL_TREE,
3211 const_string_type_node,
3214 int_ftype_string_string /* strcmp prototype */
3215 = build_function_type (integer_type_node,
3216 tree_cons (NULL_TREE, const_string_type_node,
3217 tree_cons (NULL_TREE,
3218 const_string_type_node,
3221 strlen_ftype /* strlen prototype */
3222 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3223 tree_cons (NULL_TREE, const_string_type_node,
3226 traditional_ptr_type_node
3227 = (flag_traditional ? string_type_node : ptr_type_node);
3229 memcpy_ftype /* memcpy prototype */
3230 = build_function_type (traditional_ptr_type_node,
3231 tree_cons (NULL_TREE, ptr_type_node,
3232 tree_cons (NULL_TREE, const_ptr_type_node,
3233 tree_cons (NULL_TREE,
3237 memset_ftype /* memset prototype */
3238 = build_function_type (traditional_ptr_type_node,
3239 tree_cons (NULL_TREE, ptr_type_node,
3240 tree_cons (NULL_TREE, integer_type_node,
3241 tree_cons (NULL_TREE,
3245 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3247 = build_function_type (ptr_type_node,
3248 tree_cons (NULL_TREE, ptr_type_node, endlink));
3250 builtin_function ("__builtin_constant_p", default_function_type,
3251 BUILT_IN_CONSTANT_P, NULL_PTR);
3253 builtin_function ("__builtin_return_address",
3254 build_function_type (ptr_type_node,
3255 tree_cons (NULL_TREE,
3258 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3260 builtin_function ("__builtin_frame_address",
3261 build_function_type (ptr_type_node,
3262 tree_cons (NULL_TREE,
3265 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3267 builtin_function ("__builtin_aggregate_incoming_address",
3268 build_function_type (ptr_type_node, NULL_TREE),
3269 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3271 /* Hooks for the DWARF 2 __throw routine. */
3272 builtin_function ("__builtin_unwind_init",
3273 build_function_type (void_type_node, endlink),
3274 BUILT_IN_UNWIND_INIT, NULL_PTR);
3275 builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
3276 builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
3277 builtin_function ("__builtin_dwarf_fp_regnum",
3278 build_function_type (unsigned_type_node, endlink),
3279 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3280 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3281 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3282 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3283 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3284 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3285 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3286 builtin_function ("__builtin_set_return_addr_reg",
3287 build_function_type (void_type_node,
3288 tree_cons (NULL_TREE,
3291 BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
3292 builtin_function ("__builtin_eh_stub_old", ptr_ftype_void,
3293 BUILT_IN_EH_STUB_OLD, NULL_PTR);
3294 builtin_function ("__builtin_eh_stub", ptr_ftype_void,
3295 BUILT_IN_EH_STUB, NULL_PTR);
3297 ("__builtin_set_eh_regs",
3298 build_function_type (void_type_node,
3299 tree_cons (NULL_TREE, ptr_type_node,
3300 tree_cons (NULL_TREE,
3301 type_for_mode (ptr_mode, 0),
3303 BUILT_IN_SET_EH_REGS, NULL_PTR);
3305 builtin_function ("__builtin_alloca",
3306 build_function_type (ptr_type_node,
3307 tree_cons (NULL_TREE,
3310 BUILT_IN_ALLOCA, "alloca");
3311 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3312 /* Define alloca, ffs as builtins.
3313 Declare _exit just to mark it as volatile. */
3314 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3316 temp = builtin_function ("alloca",
3317 build_function_type (ptr_type_node,
3318 tree_cons (NULL_TREE,
3321 BUILT_IN_ALLOCA, NULL_PTR);
3322 /* Suppress error if redefined as a non-function. */
3323 DECL_BUILT_IN_NONANSI (temp) = 1;
3324 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3325 /* Suppress error if redefined as a non-function. */
3326 DECL_BUILT_IN_NONANSI (temp) = 1;
3327 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3329 TREE_THIS_VOLATILE (temp) = 1;
3330 TREE_SIDE_EFFECTS (temp) = 1;
3331 /* Suppress error if redefined as a non-function. */
3332 DECL_BUILT_IN_NONANSI (temp) = 1;
3335 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3336 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3338 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3340 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3342 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3344 builtin_function ("__builtin_saveregs",
3345 build_function_type (ptr_type_node, NULL_TREE),
3346 BUILT_IN_SAVEREGS, NULL_PTR);
3347 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3349 builtin_function ("__builtin_varargs",
3350 build_function_type (ptr_type_node,
3351 tree_cons (NULL_TREE,
3354 BUILT_IN_VARARGS, NULL_PTR);
3356 builtin_function ("__builtin_classify_type", default_function_type,
3357 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3358 builtin_function ("__builtin_next_arg",
3359 build_function_type (ptr_type_node, NULL_TREE),
3360 BUILT_IN_NEXT_ARG, NULL_PTR);
3361 builtin_function ("__builtin_args_info",
3362 build_function_type (integer_type_node,
3363 tree_cons (NULL_TREE,
3366 BUILT_IN_ARGS_INFO, NULL_PTR);
3368 /* Untyped call and return. */
3369 builtin_function ("__builtin_apply_args",
3370 build_function_type (ptr_type_node, NULL_TREE),
3371 BUILT_IN_APPLY_ARGS, NULL_PTR);
3373 temp = tree_cons (NULL_TREE,
3374 build_pointer_type (build_function_type (void_type_node,
3376 tree_cons (NULL_TREE,
3378 tree_cons (NULL_TREE,
3381 builtin_function ("__builtin_apply",
3382 build_function_type (ptr_type_node, temp),
3383 BUILT_IN_APPLY, NULL_PTR);
3384 builtin_function ("__builtin_return",
3385 build_function_type (void_type_node,
3386 tree_cons (NULL_TREE,
3389 BUILT_IN_RETURN, NULL_PTR);
3391 /* Currently under experimentation. */
3392 builtin_function ("__builtin_memcpy", memcpy_ftype,
3393 BUILT_IN_MEMCPY, "memcpy");
3394 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3395 BUILT_IN_MEMCMP, "memcmp");
3396 builtin_function ("__builtin_memset", memset_ftype,
3397 BUILT_IN_MEMSET, "memset");
3398 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3399 BUILT_IN_STRCMP, "strcmp");
3400 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3401 BUILT_IN_STRCPY, "strcpy");
3402 builtin_function ("__builtin_strlen", strlen_ftype,
3403 BUILT_IN_STRLEN, "strlen");
3404 builtin_function ("__builtin_sqrtf", float_ftype_float,
3405 BUILT_IN_FSQRT, "sqrtf");
3406 builtin_function ("__builtin_fsqrt", double_ftype_double,
3407 BUILT_IN_FSQRT, "sqrt");
3408 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3409 BUILT_IN_FSQRT, "sqrtl");
3410 builtin_function ("__builtin_sinf", float_ftype_float,
3411 BUILT_IN_SIN, "sinf");
3412 builtin_function ("__builtin_sin", double_ftype_double,
3413 BUILT_IN_SIN, "sin");
3414 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3415 BUILT_IN_SIN, "sinl");
3416 builtin_function ("__builtin_cosf", float_ftype_float,
3417 BUILT_IN_COS, "cosf");
3418 builtin_function ("__builtin_cos", double_ftype_double,
3419 BUILT_IN_COS, "cos");
3420 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3421 BUILT_IN_COS, "cosl");
3422 builtin_function ("__builtin_setjmp",
3423 build_function_type (integer_type_node,
3424 tree_cons (NULL_TREE,
3425 ptr_type_node, endlink)),
3426 BUILT_IN_SETJMP, NULL_PTR);
3427 builtin_function ("__builtin_longjmp",
3430 tree_cons (NULL, ptr_type_node,
3431 tree_cons (NULL_TREE,
3434 BUILT_IN_LONGJMP, NULL_PTR);
3435 builtin_function ("__builtin_trap",
3436 build_function_type (void_type_node, endlink),
3437 BUILT_IN_TRAP, NULL_PTR);
3439 /* In an ANSI C program, it is okay to supply built-in meanings
3440 for these functions, since applications cannot validly use them
3441 with any other meaning.
3442 However, honor the -fno-builtin option. */
3443 if (!flag_no_builtin)
3445 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3446 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3447 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3448 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3450 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3451 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3452 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3454 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3455 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3457 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3459 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3460 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3461 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3462 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3464 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3465 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3466 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3467 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3468 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3469 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3471 /* Declare these functions volatile
3472 to avoid spurious "control drops through" warnings. */
3473 /* Don't specify the argument types, to avoid errors
3474 from certain code which isn't valid in ANSI but which exists. */
3475 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3477 TREE_THIS_VOLATILE (temp) = 1;
3478 TREE_SIDE_EFFECTS (temp) = 1;
3479 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3480 TREE_THIS_VOLATILE (temp) = 1;
3481 TREE_SIDE_EFFECTS (temp) = 1;
3485 /* Support for these has not been written in either expand_builtin
3486 or build_function_call. */
3487 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3488 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3489 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3491 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3493 builtin_function ("__builtin_fmod", double_ftype_double_double,
3494 BUILT_IN_FMOD, NULL_PTR);
3495 builtin_function ("__builtin_frem", double_ftype_double_double,
3496 BUILT_IN_FREM, NULL_PTR);
3497 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3499 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3503 pedantic_lvalues = pedantic;
3505 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3506 declare_function_name ();
3508 start_identifier_warnings ();
3510 /* Prepare to check format strings against argument lists. */
3511 init_function_format_info ();
3515 incomplete_decl_finalize_hook = finish_incomplete_decl;
3518 /* Return a definition for a builtin function named NAME and whose data type
3519 is TYPE. TYPE should be a function type with argument types.
3520 FUNCTION_CODE tells later passes how to compile calls to this function.
3521 See tree.h for its possible values.
3523 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3524 the name to be called if we can't opencode the function. */
3527 builtin_function (name, type, function_code, library_name)
3530 enum built_in_function function_code;
3533 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3534 DECL_EXTERNAL (decl) = 1;
3535 TREE_PUBLIC (decl) = 1;
3536 /* If -traditional, permit redefining a builtin function any way you like.
3537 (Though really, if the program redefines these functions,
3538 it probably won't work right unless compiled with -fno-builtin.) */
3539 if (flag_traditional && name[0] != '_')
3540 DECL_BUILT_IN_NONANSI (decl) = 1;
3542 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3543 make_decl_rtl (decl, NULL_PTR, 1);
3545 if (function_code != NOT_BUILT_IN)
3547 DECL_BUILT_IN (decl) = 1;
3548 DECL_FUNCTION_CODE (decl) = function_code;
3550 /* Warn if a function in the namespace for users
3551 is used without an occasion to consider it declared. */
3552 if (name[0] != '_' || name[1] != '_')
3553 C_DECL_ANTICIPATED (decl) = 1;
3558 /* Called when a declaration is seen that contains no names to declare.
3559 If its type is a reference to a structure, union or enum inherited
3560 from a containing scope, shadow that tag name for the current scope
3561 with a forward reference.
3562 If its type defines a new named structure or union
3563 or defines an enum, it is valid but we need not do anything here.
3564 Otherwise, it is an error. */
3567 shadow_tag (declspecs)
3570 shadow_tag_warned (declspecs, 0);
3574 shadow_tag_warned (declspecs, warned)
3577 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3584 pending_invalid_xref = 0;
3586 /* Remove the attributes from declspecs, since they will confuse the
3588 split_specs_attrs (declspecs, &specs, &attrs);
3590 for (link = specs; link; link = TREE_CHAIN (link))
3592 register tree value = TREE_VALUE (link);
3593 register enum tree_code code = TREE_CODE (value);
3595 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3596 /* Used to test also that TYPE_SIZE (value) != 0.
3597 That caused warning for `struct foo;' at top level in the file. */
3599 register tree name = lookup_tag_reverse (value);
3606 if (warned != 1 && code != ENUMERAL_TYPE)
3607 /* Empty unnamed enum OK */
3609 pedwarn ("unnamed struct/union that defines no instances");
3615 t = lookup_tag (code, name, current_binding_level, 1);
3619 t = make_node (code);
3626 if (!warned && ! in_system_header)
3628 warning ("useless keyword or type name in empty declaration");
3635 error ("two types specified in one empty declaration");
3640 pedwarn ("empty declaration");
3644 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3647 groktypename (typename)
3650 if (TREE_CODE (typename) != TREE_LIST)
3652 return grokdeclarator (TREE_VALUE (typename),
3653 TREE_PURPOSE (typename),
3657 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3660 groktypename_in_parm_context (typename)
3663 if (TREE_CODE (typename) != TREE_LIST)
3665 return grokdeclarator (TREE_VALUE (typename),
3666 TREE_PURPOSE (typename),
3670 /* Decode a declarator in an ordinary declaration or data definition.
3671 This is called as soon as the type information and variable name
3672 have been parsed, before parsing the initializer if any.
3673 Here we create the ..._DECL node, fill in its type,
3674 and put it on the list of decls for the current context.
3675 The ..._DECL node is returned as the value.
3677 Exception: for arrays where the length is not specified,
3678 the type is left null, to be filled in by `finish_decl'.
3680 Function definitions do not come here; they go to start_function
3681 instead. However, external and forward declarations of functions
3682 do go through here. Structure field declarations are done by
3683 grokfield and not through here. */
3685 /* Set this to zero to debug not using the temporary obstack
3686 to parse initializers. */
3687 int debug_temp_inits = 1;
3690 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3691 tree declarator, declspecs;
3693 tree attributes, prefix_attributes;
3695 register tree decl = grokdeclarator (declarator, declspecs,
3696 NORMAL, initialized);
3698 int init_written = initialized;
3700 /* The corresponding pop_obstacks is in finish_decl. */
3701 push_obstacks_nochange ();
3703 if (warn_main && TREE_CODE (decl) != FUNCTION_DECL
3704 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3705 warning_with_decl (decl, "`%s' is usually a function");
3708 /* Is it valid for this decl to have an initializer at all?
3709 If not, set INITIALIZED to zero, which will indirectly
3710 tell `finish_decl' to ignore the initializer once it is parsed. */
3711 switch (TREE_CODE (decl))
3714 /* typedef foo = bar means give foo the same type as bar.
3715 We haven't parsed bar yet, so `finish_decl' will fix that up.
3716 Any other case of an initialization in a TYPE_DECL is an error. */
3717 if (pedantic || list_length (declspecs) > 1)
3719 error ("typedef `%s' is initialized",
3720 IDENTIFIER_POINTER (DECL_NAME (decl)));
3726 error ("function `%s' is initialized like a variable",
3727 IDENTIFIER_POINTER (DECL_NAME (decl)));
3732 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3733 error ("parameter `%s' is initialized",
3734 IDENTIFIER_POINTER (DECL_NAME (decl)));
3739 /* Don't allow initializations for incomplete types
3740 except for arrays which might be completed by the initialization. */
3741 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3743 /* A complete type is ok if size is fixed. */
3745 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3746 || C_DECL_VARIABLE_SIZE (decl))
3748 error ("variable-sized object may not be initialized");
3752 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3754 error ("variable `%s' has initializer but incomplete type",
3755 IDENTIFIER_POINTER (DECL_NAME (decl)));
3758 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3760 error ("elements of array `%s' have incomplete type",
3761 IDENTIFIER_POINTER (DECL_NAME (decl)));
3768 #if 0 /* Seems redundant with grokdeclarator. */
3769 if (current_binding_level != global_binding_level
3770 && DECL_EXTERNAL (decl)
3771 && TREE_CODE (decl) != FUNCTION_DECL)
3772 warning ("declaration of `%s' has `extern' and is initialized",
3773 IDENTIFIER_POINTER (DECL_NAME (decl)));
3775 DECL_EXTERNAL (decl) = 0;
3776 if (current_binding_level == global_binding_level)
3777 TREE_STATIC (decl) = 1;
3779 /* Tell `pushdecl' this is an initialized decl
3780 even though we don't yet have the initializer expression.
3781 Also tell `finish_decl' it may store the real initializer. */
3782 DECL_INITIAL (decl) = error_mark_node;
3785 /* If this is a function declaration, write a record describing it to the
3786 prototypes file (if requested). */
3788 if (TREE_CODE (decl) == FUNCTION_DECL)
3789 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3791 /* ANSI specifies that a tentative definition which is not merged with
3792 a non-tentative definition behaves exactly like a definition with an
3793 initializer equal to zero. (Section 3.7.2)
3794 -fno-common gives strict ANSI behavior. Usually you don't want it.
3795 This matters only for variables with external linkage. */
3796 if (! flag_no_common || ! TREE_PUBLIC (decl))
3797 DECL_COMMON (decl) = 1;
3799 /* Set attributes here so if duplicate decl, will have proper attributes. */
3800 decl_attributes (decl, attributes, prefix_attributes);
3802 /* Add this decl to the current binding level.
3803 TEM may equal DECL or it may be a previous decl of the same name. */
3804 tem = pushdecl (decl);
3806 /* For a local variable, define the RTL now. */
3807 if (current_binding_level != global_binding_level
3808 /* But not if this is a duplicate decl
3809 and we preserved the rtl from the previous one
3810 (which may or may not happen). */
3811 && DECL_RTL (tem) == 0)
3813 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3815 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3816 && DECL_INITIAL (tem) != 0)
3822 /* When parsing and digesting the initializer,
3823 use temporary storage. Do this even if we will ignore the value. */
3824 if (current_binding_level == global_binding_level && debug_temp_inits)
3825 temporary_allocation ();
3831 /* Finish processing of a declaration;
3832 install its initial value.
3833 If the length of an array type is not known before,
3834 it must be determined now, from the initial value, or it is an error. */
3837 finish_decl (decl, init, asmspec_tree)
3841 register tree type = TREE_TYPE (decl);
3842 int was_incomplete = (DECL_SIZE (decl) == 0);
3843 int temporary = allocation_temporary_p ();
3846 /* If a name was specified, get the string. */
3848 asmspec = TREE_STRING_POINTER (asmspec_tree);
3850 /* If `start_decl' didn't like having an initialization, ignore it now. */
3852 if (init != 0 && DECL_INITIAL (decl) == 0)
3854 /* Don't crash if parm is initialized. */
3855 if (TREE_CODE (decl) == PARM_DECL)
3858 if (ITERATOR_P (decl))
3861 error_with_decl (decl, "iterator has no initial value");
3863 init = save_expr (init);
3868 if (TREE_CODE (decl) != TYPE_DECL)
3869 store_init_value (decl, init);
3872 /* typedef foo = bar; store the type of bar as the type of foo. */
3873 TREE_TYPE (decl) = TREE_TYPE (init);
3874 DECL_INITIAL (decl) = init = 0;
3878 /* Pop back to the obstack that is current for this binding level.
3879 This is because MAXINDEX, rtl, etc. to be made below
3880 must go in the permanent obstack. But don't discard the
3881 temporary data yet. */
3883 #if 0 /* pop_obstacks was near the end; this is what was here. */
3884 if (current_binding_level == global_binding_level && temporary)
3885 end_temporary_allocation ();
3888 /* Deduce size of array from initialization, if not already known */
3890 if (TREE_CODE (type) == ARRAY_TYPE
3891 && TYPE_DOMAIN (type) == 0
3892 && TREE_CODE (decl) != TYPE_DECL)
3895 = (TREE_STATIC (decl)
3896 /* Even if pedantic, an external linkage array
3897 may have incomplete type at first. */
3898 ? pedantic && !TREE_PUBLIC (decl)
3899 : !DECL_EXTERNAL (decl));
3901 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3903 /* Get the completed type made by complete_array_type. */
3904 type = TREE_TYPE (decl);
3907 error_with_decl (decl, "initializer fails to determine size of `%s'");
3912 error_with_decl (decl, "array size missing in `%s'");
3913 /* If a `static' var's size isn't known,
3914 make it extern as well as static, so it does not get
3916 If it is not `static', then do not mark extern;
3917 finish_incomplete_decl will give it a default size
3918 and it will get allocated. */
3919 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3920 DECL_EXTERNAL (decl) = 1;
3923 /* TYPE_MAX_VALUE is always one less than the number of elements
3924 in the array, because we start counting at zero. Therefore,
3925 warn only if the value is less than zero. */
3926 if (pedantic && TYPE_DOMAIN (type) != 0
3927 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3928 error_with_decl (decl, "zero or negative size array `%s'");
3930 layout_decl (decl, 0);
3933 if (TREE_CODE (decl) == VAR_DECL)
3935 if (DECL_SIZE (decl) == 0
3936 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3937 layout_decl (decl, 0);
3939 if (DECL_SIZE (decl) == 0
3940 && (TREE_STATIC (decl)
3942 /* A static variable with an incomplete type
3943 is an error if it is initialized.
3944 Also if it is not file scope.
3945 Otherwise, let it through, but if it is not `extern'
3946 then it may cause an error message later. */
3947 /* A duplicate_decls call could have changed an extern
3948 declaration into a file scope one. This can be detected
3949 by TREE_ASM_WRITTEN being set. */
3950 (DECL_INITIAL (decl) != 0
3951 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3953 /* An automatic variable with an incomplete type
3955 !DECL_EXTERNAL (decl)))
3957 error_with_decl (decl, "storage size of `%s' isn't known");
3958 TREE_TYPE (decl) = error_mark_node;
3961 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3962 && DECL_SIZE (decl) != 0)
3964 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3965 constant_expression_warning (DECL_SIZE (decl));
3967 error_with_decl (decl, "storage size of `%s' isn't constant");
3970 if (TREE_USED (type))
3971 TREE_USED (decl) = 1;
3974 /* If this is a function and an assembler name is specified, it isn't
3975 builtin any more. Also reset DECL_RTL so we can give it its new
3977 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3979 DECL_BUILT_IN (decl) = 0;
3980 DECL_RTL (decl) = 0;
3983 /* Output the assembler code and/or RTL code for variables and functions,
3984 unless the type is an undefined structure or union.
3985 If not, it will get done when the type is completed. */
3987 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3989 if ((flag_traditional || TREE_PERMANENT (decl))
3990 && allocation_temporary_p ())
3992 push_obstacks_nochange ();
3993 end_temporary_allocation ();
3994 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3995 maybe_objc_check_decl (decl);
3996 rest_of_decl_compilation (decl, asmspec,
3997 (DECL_CONTEXT (decl) == 0
3998 || TREE_ASM_WRITTEN (decl)),
4004 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4005 maybe_objc_check_decl (decl);
4006 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4009 if (DECL_CONTEXT (decl) != 0)
4011 /* Recompute the RTL of a local array now
4012 if it used to be an incomplete type. */
4014 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4016 /* If we used it already as memory, it must stay in memory. */
4017 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4018 /* If it's still incomplete now, no init will save it. */
4019 if (DECL_SIZE (decl) == 0)
4020 DECL_INITIAL (decl) = 0;
4023 /* Compute and store the initial value. */
4024 if (TREE_CODE (decl) != FUNCTION_DECL)
4025 expand_decl_init (decl);
4029 if (TREE_CODE (decl) == TYPE_DECL)
4031 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4032 maybe_objc_check_decl (decl);
4033 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4037 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4038 /* This test used to include TREE_PERMANENT, however, we have the same
4039 problem with initializers at the function level. Such initializers get
4040 saved until the end of the function on the momentary_obstack. */
4041 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4043 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4044 space with DECL_ARG_TYPE. */
4045 && TREE_CODE (decl) != PARM_DECL)
4047 /* We need to remember that this array HAD an initialization,
4048 but discard the actual temporary nodes,
4049 since we can't have a permanent node keep pointing to them. */
4050 /* We make an exception for inline functions, since it's
4051 normal for a local extern redeclaration of an inline function
4052 to have a copy of the top-level decl's DECL_INLINE. */
4053 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4055 /* If this is a const variable, then preserve the
4056 initializer instead of discarding it so that we can optimize
4057 references to it. */
4058 /* This test used to include TREE_STATIC, but this won't be set
4059 for function level initializers. */
4060 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4062 preserve_initializer ();
4063 /* Hack? Set the permanent bit for something that is permanent,
4064 but not on the permanent obstack, so as to convince
4065 output_constant_def to make its rtl on the permanent
4067 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4069 /* The initializer and DECL must have the same (or equivalent
4070 types), but if the initializer is a STRING_CST, its type
4071 might not be on the right obstack, so copy the type
4073 TREE_TYPE (DECL_INITIAL (decl)) = type;
4076 DECL_INITIAL (decl) = error_mark_node;
4080 /* If requested, warn about definitions of large data objects. */
4082 if (warn_larger_than
4083 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4084 && !DECL_EXTERNAL (decl))
4086 register tree decl_size = DECL_SIZE (decl);
4088 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4090 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4092 if (units > larger_than_size)
4093 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4098 /* Resume permanent allocation, if not within a function. */
4099 /* The corresponding push_obstacks_nochange is in start_decl,
4100 and in push_parm_decl and in grokfield. */
4104 /* If we have gone back from temporary to permanent allocation,
4105 actually free the temporary space that we no longer need. */
4106 if (temporary && !allocation_temporary_p ())
4107 permanent_allocation (0);
4109 /* At the end of a declaration, throw away any variable type sizes
4110 of types defined inside that declaration. There is no use
4111 computing them in the following function definition. */
4112 if (current_binding_level == global_binding_level)
4113 get_pending_sizes ();
4116 /* If DECL has a cleanup, build and return that cleanup here.
4117 This is a callback called by expand_expr. */
4120 maybe_build_cleanup (decl)
4121 tree decl ATTRIBUTE_UNUSED;
4123 /* There are no cleanups in C. */
4127 /* Given a parsed parameter declaration,
4128 decode it into a PARM_DECL and push that on the current binding level.
4129 Also, for the sake of forward parm decls,
4130 record the given order of parms in `parm_order'. */
4133 push_parm_decl (parm)
4137 int old_immediate_size_expand = immediate_size_expand;
4138 /* Don't try computing parm sizes now -- wait till fn is called. */
4139 immediate_size_expand = 0;
4141 /* The corresponding pop_obstacks is in finish_decl. */
4142 push_obstacks_nochange ();
4144 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4145 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4146 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4147 TREE_PURPOSE (TREE_VALUE (parm)));
4150 if (DECL_NAME (decl))
4153 olddecl = lookup_name (DECL_NAME (decl));
4154 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4155 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4159 decl = pushdecl (decl);
4161 immediate_size_expand = old_immediate_size_expand;
4163 current_binding_level->parm_order
4164 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4166 /* Add this decl to the current binding level. */
4167 finish_decl (decl, NULL_TREE, NULL_TREE);
4170 /* Clear the given order of parms in `parm_order'.
4171 Used at start of parm list,
4172 and also at semicolon terminating forward decls. */
4177 current_binding_level->parm_order = NULL_TREE;
4180 /* Make TYPE a complete type based on INITIAL_VALUE.
4181 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4182 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4185 complete_array_type (type, initial_value, do_default)
4190 register tree maxindex = NULL_TREE;
4195 /* Note MAXINDEX is really the maximum index,
4196 one less than the size. */
4197 if (TREE_CODE (initial_value) == STRING_CST)
4200 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4201 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4204 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4206 tree elts = CONSTRUCTOR_ELTS (initial_value);
4207 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4208 for (; elts; elts = TREE_CHAIN (elts))
4210 if (TREE_PURPOSE (elts))
4211 maxindex = TREE_PURPOSE (elts);
4213 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4215 maxindex = copy_node (maxindex);
4219 /* Make an error message unless that happened already. */
4220 if (initial_value != error_mark_node)
4223 /* Prevent further error messages. */
4224 maxindex = build_int_2 (0, 0);
4231 maxindex = build_int_2 (0, 0);
4237 TYPE_DOMAIN (type) = build_index_type (maxindex);
4238 if (!TREE_TYPE (maxindex))
4239 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4242 /* Lay out the type now that we can get the real answer. */
4249 /* Given declspecs and a declarator,
4250 determine the name and type of the object declared
4251 and construct a ..._DECL node for it.
4252 (In one case we can return a ..._TYPE node instead.
4253 For invalid input we sometimes return 0.)
4255 DECLSPECS is a chain of tree_list nodes whose value fields
4256 are the storage classes and type specifiers.
4258 DECL_CONTEXT says which syntactic context this declaration is in:
4259 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4260 FUNCDEF for a function definition. Like NORMAL but a few different
4261 error messages in each case. Return value may be zero meaning
4262 this definition is too screwy to try to parse.
4263 PARM for a parameter declaration (either within a function prototype
4264 or before a function body). Make a PARM_DECL, or return void_type_node.
4265 TYPENAME if for a typename (in a cast or sizeof).
4266 Don't make a DECL node; just return the ..._TYPE node.
4267 FIELD for a struct or union field; make a FIELD_DECL.
4268 BITFIELD for a field with specified width.
4269 INITIALIZED is 1 if the decl has an initializer.
4271 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4272 It may also be so in the PARM case, for a prototype where the
4273 argument type is specified but not the name.
4275 This function is where the complicated C meanings of `static'
4276 and `extern' are interpreted. */
4279 grokdeclarator (declarator, declspecs, decl_context, initialized)
4282 enum decl_context decl_context;
4287 tree type = NULL_TREE;
4292 int explicit_int = 0;
4293 int explicit_char = 0;
4294 int defaulted_int = 0;
4295 tree typedef_decl = 0;
4297 tree typedef_type = 0;
4298 int funcdef_flag = 0;
4299 enum tree_code innermost_code = ERROR_MARK;
4301 int size_varies = 0;
4302 tree decl_machine_attr = NULL_TREE;
4304 if (decl_context == BITFIELD)
4305 bitfield = 1, decl_context = FIELD;
4307 if (decl_context == FUNCDEF)
4308 funcdef_flag = 1, decl_context = NORMAL;
4310 push_obstacks_nochange ();
4312 if (flag_traditional && allocation_temporary_p ())
4313 end_temporary_allocation ();
4315 /* Look inside a declarator for the name being declared
4316 and get it as a string, for an error message. */
4318 register tree decl = declarator;
4322 switch (TREE_CODE (decl))
4327 innermost_code = TREE_CODE (decl);
4328 decl = TREE_OPERAND (decl, 0);
4331 case IDENTIFIER_NODE:
4332 name = IDENTIFIER_POINTER (decl);
4343 /* A function definition's declarator must have the form of
4344 a function declarator. */
4346 if (funcdef_flag && innermost_code != CALL_EXPR)
4349 /* Anything declared one level down from the top level
4350 must be one of the parameters of a function
4351 (because the body is at least two levels down). */
4353 /* If this looks like a function definition, make it one,
4354 even if it occurs where parms are expected.
4355 Then store_parm_decls will reject it and not use it as a parm. */
4356 if (decl_context == NORMAL && !funcdef_flag
4357 && current_binding_level->parm_flag)
4358 decl_context = PARM;
4360 /* Look through the decl specs and record which ones appear.
4361 Some typespecs are defined as built-in typenames.
4362 Others, the ones that are modifiers of other types,
4363 are represented by bits in SPECBITS: set the bits for
4364 the modifiers that appear. Storage class keywords are also in SPECBITS.
4366 If there is a typedef name or a type, store the type in TYPE.
4367 This includes builtin typedefs such as `int'.
4369 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4370 and did not come from a user typedef.
4372 Set LONGLONG if `long' is mentioned twice. */
4374 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4377 register tree id = TREE_VALUE (spec);
4379 if (id == ridpointers[(int) RID_INT])
4381 if (id == ridpointers[(int) RID_CHAR])
4384 if (TREE_CODE (id) == IDENTIFIER_NODE)
4385 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4387 if (ridpointers[i] == id)
4389 if (i == (int) RID_LONG && specbits & (1<<i))
4392 error ("`long long long' is too long for GCC");
4395 if (pedantic && ! in_system_header)
4396 pedwarn ("ANSI C does not support `long long'");
4400 else if (specbits & (1 << i))
4401 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4407 error ("two or more data types in declaration of `%s'", name);
4408 /* Actual typedefs come to us as TYPE_DECL nodes. */
4409 else if (TREE_CODE (id) == TYPE_DECL)
4411 type = TREE_TYPE (id);
4412 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4415 /* Built-in types come as identifiers. */
4416 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4418 register tree t = lookup_name (id);
4419 if (TREE_TYPE (t) == error_mark_node)
4421 else if (!t || TREE_CODE (t) != TYPE_DECL)
4422 error ("`%s' fails to be a typedef or built in type",
4423 IDENTIFIER_POINTER (id));
4426 type = TREE_TYPE (t);
4430 else if (TREE_CODE (id) != ERROR_MARK)
4436 typedef_type = type;
4438 size_varies = C_TYPE_VARIABLE_SIZE (type);
4440 /* No type at all: default to `int', and set DEFAULTED_INT
4441 because it was not a user-defined typedef. */
4445 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4446 | (1 << (int) RID_SIGNED)
4447 | (1 << (int) RID_UNSIGNED))))
4448 && ! (in_system_header && ! allocation_temporary_p ()))
4450 /* C9x will probably require a diagnostic here.
4451 For now, issue a warning if -Wreturn-type and this is a function,
4452 or if -Wimplicit; prefer the former warning since it is more
4454 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4455 warn_about_return_type = 1;
4456 else if (warn_implicit_int)
4457 warning ("type defaults to `int' in declaration of `%s'", name);
4461 type = integer_type_node;
4464 /* Now process the modifiers that were specified
4465 and check for invalid combinations. */
4467 /* Long double is a special combination. */
4469 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4470 && TYPE_MAIN_VARIANT (type) == double_type_node)
4472 specbits &= ~ (1 << (int) RID_LONG);
4473 type = long_double_type_node;
4476 /* Check all other uses of type modifiers. */
4478 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4479 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4483 if ((specbits & 1 << (int) RID_LONG)
4484 && (specbits & 1 << (int) RID_SHORT))
4485 error ("both long and short specified for `%s'", name);
4486 else if (((specbits & 1 << (int) RID_LONG)
4487 || (specbits & 1 << (int) RID_SHORT))
4489 error ("long or short specified with char for `%s'", name);
4490 else if (((specbits & 1 << (int) RID_LONG)
4491 || (specbits & 1 << (int) RID_SHORT))
4492 && TREE_CODE (type) == REAL_TYPE)
4494 static int already = 0;
4496 error ("long or short specified with floating type for `%s'", name);
4497 if (! already && ! pedantic)
4499 error ("the only valid combination is `long double'");
4503 else if ((specbits & 1 << (int) RID_SIGNED)
4504 && (specbits & 1 << (int) RID_UNSIGNED))
4505 error ("both signed and unsigned specified for `%s'", name);
4506 else if (TREE_CODE (type) != INTEGER_TYPE)
4507 error ("long, short, signed or unsigned invalid for `%s'", name);
4511 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4513 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4515 if (flag_pedantic_errors)
4520 /* Discard the type modifiers if they are invalid. */
4523 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4524 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4529 if ((specbits & (1 << (int) RID_COMPLEX))
4530 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4532 error ("complex invalid for `%s'", name);
4533 specbits &= ~ (1 << (int) RID_COMPLEX);
4536 /* Decide whether an integer type is signed or not.
4537 Optionally treat bitfields as signed by default. */
4538 if (specbits & 1 << (int) RID_UNSIGNED
4539 /* Traditionally, all bitfields are unsigned. */
4540 || (bitfield && flag_traditional
4541 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4542 || (bitfield && ! flag_signed_bitfields
4543 && (explicit_int || defaulted_int || explicit_char
4544 /* A typedef for plain `int' without `signed'
4545 can be controlled just like plain `int'. */
4546 || ! (typedef_decl != 0
4547 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4548 && TREE_CODE (type) != ENUMERAL_TYPE
4549 && !(specbits & 1 << (int) RID_SIGNED)))
4552 type = long_long_unsigned_type_node;
4553 else if (specbits & 1 << (int) RID_LONG)
4554 type = long_unsigned_type_node;
4555 else if (specbits & 1 << (int) RID_SHORT)
4556 type = short_unsigned_type_node;
4557 else if (type == char_type_node)
4558 type = unsigned_char_type_node;
4559 else if (typedef_decl)
4560 type = unsigned_type (type);
4562 type = unsigned_type_node;
4564 else if ((specbits & 1 << (int) RID_SIGNED)
4565 && type == char_type_node)
4566 type = signed_char_type_node;
4568 type = long_long_integer_type_node;
4569 else if (specbits & 1 << (int) RID_LONG)
4570 type = long_integer_type_node;
4571 else if (specbits & 1 << (int) RID_SHORT)
4572 type = short_integer_type_node;
4574 if (specbits & 1 << (int) RID_COMPLEX)
4576 /* If we just have "complex", it is equivalent to
4577 "complex double", but if any modifiers at all are specified it is
4578 the complex form of TYPE. E.g, "complex short" is
4579 "complex short int". */
4581 if (defaulted_int && ! longlong
4582 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4583 | (1 << (int) RID_SIGNED)
4584 | (1 << (int) RID_UNSIGNED))))
4585 type = complex_double_type_node;
4586 else if (type == integer_type_node)
4587 type = complex_integer_type_node;
4588 else if (type == float_type_node)
4589 type = complex_float_type_node;
4590 else if (type == double_type_node)
4591 type = complex_double_type_node;
4592 else if (type == long_double_type_node)
4593 type = complex_long_double_type_node;
4595 type = build_complex_type (type);
4598 /* Set CONSTP if this declaration is `const', whether by
4599 explicit specification or via a typedef.
4600 Likewise for VOLATILEP. */
4602 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4603 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4604 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4606 pedwarn ("duplicate `const'");
4608 pedwarn ("duplicate `volatile'");
4609 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4610 type = TYPE_MAIN_VARIANT (type);
4612 /* Warn if two storage classes are given. Default to `auto'. */
4617 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4618 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4619 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4620 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4621 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4622 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4624 /* Warn about storage classes that are invalid for certain
4625 kinds of declarations (parameters, typenames, etc.). */
4628 error ("multiple storage classes in declaration of `%s'", name);
4629 else if (funcdef_flag
4631 & ((1 << (int) RID_REGISTER)
4632 | (1 << (int) RID_AUTO)
4633 | (1 << (int) RID_TYPEDEF))))
4635 if (specbits & 1 << (int) RID_AUTO
4636 && (pedantic || current_binding_level == global_binding_level))
4637 pedwarn ("function definition declared `auto'");
4638 if (specbits & 1 << (int) RID_REGISTER)
4639 error ("function definition declared `register'");
4640 if (specbits & 1 << (int) RID_TYPEDEF)
4641 error ("function definition declared `typedef'");
4642 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4643 | (1 << (int) RID_AUTO));
4645 else if (decl_context != NORMAL && nclasses > 0)
4647 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4651 error ((decl_context == FIELD
4652 ? "storage class specified for structure field `%s'"
4653 : (decl_context == PARM
4654 ? "storage class specified for parameter `%s'"
4655 : "storage class specified for typename")),
4657 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4658 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4659 | (1 << (int) RID_EXTERN));
4662 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4664 /* `extern' with initialization is invalid if not at top level. */
4665 if (current_binding_level == global_binding_level)
4666 warning ("`%s' initialized and declared `extern'", name);
4668 error ("`%s' has both `extern' and initializer", name);
4670 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4671 && current_binding_level != global_binding_level)
4672 error ("nested function `%s' declared `extern'", name);
4673 else if (current_binding_level == global_binding_level
4674 && specbits & (1 << (int) RID_AUTO))
4675 error ("top-level declaration of `%s' specifies `auto'", name);
4676 else if ((specbits & 1 << (int) RID_ITERATOR)
4677 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4679 error ("iterator `%s' has derived type", name);
4680 type = error_mark_node;
4682 else if ((specbits & 1 << (int) RID_ITERATOR)
4683 && TREE_CODE (type) != INTEGER_TYPE)
4685 error ("iterator `%s' has noninteger type", name);
4686 type = error_mark_node;
4690 /* Now figure out the structure of the declarator proper.
4691 Descend through it, creating more complex types, until we reach
4692 the declared identifier (or NULL_TREE, in an absolute declarator). */
4694 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4696 if (type == error_mark_node)
4698 declarator = TREE_OPERAND (declarator, 0);
4702 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4703 an INDIRECT_REF (for *...),
4704 a CALL_EXPR (for ...(...)),
4705 an identifier (for the name being declared)
4706 or a null pointer (for the place in an absolute declarator
4707 where the name was omitted).
4708 For the last two cases, we have just exited the loop.
4710 At this point, TYPE is the type of elements of an array,
4711 or for a function to return, or for a pointer to point to.
4712 After this sequence of ifs, TYPE is the type of the
4713 array or function or pointer, and DECLARATOR has had its
4714 outermost layer removed. */
4716 if (TREE_CODE (declarator) == ARRAY_REF)
4718 register tree itype = NULL_TREE;
4719 register tree size = TREE_OPERAND (declarator, 1);
4720 /* An uninitialized decl with `extern' is a reference. */
4721 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4722 /* The index is a signed object `sizetype' bits wide. */
4723 tree index_type = signed_type (sizetype);
4725 declarator = TREE_OPERAND (declarator, 0);
4727 /* Check for some types that there cannot be arrays of. */
4729 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4731 error ("declaration of `%s' as array of voids", name);
4732 type = error_mark_node;
4735 if (TREE_CODE (type) == FUNCTION_TYPE)
4737 error ("declaration of `%s' as array of functions", name);
4738 type = error_mark_node;
4741 if (size == error_mark_node)
4742 type = error_mark_node;
4744 if (type == error_mark_node)
4747 /* If this is a block level extern, it must live past the end
4748 of the function so that we can check it against other extern
4749 declarations (IDENTIFIER_LIMBO_VALUE). */
4750 if (extern_ref && allocation_temporary_p ())
4751 end_temporary_allocation ();
4753 /* If size was specified, set ITYPE to a range-type for that size.
4754 Otherwise, ITYPE remains null. finish_decl may figure it out
4755 from an initial value. */
4759 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4760 STRIP_TYPE_NOPS (size);
4762 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4763 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4765 error ("size of array `%s' has non-integer type", name);
4766 size = integer_one_node;
4769 if (pedantic && integer_zerop (size))
4770 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4772 if (TREE_CODE (size) == INTEGER_CST)
4774 constant_expression_warning (size);
4775 if (tree_int_cst_sgn (size) < 0)
4777 error ("size of array `%s' is negative", name);
4778 size = integer_one_node;
4783 /* Make sure the array size remains visibly nonconstant
4784 even if it is (eg) a const variable with known value. */
4789 if (TREE_CONSTANT (size))
4790 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4792 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4796 /* Convert size to index_type, so that if it is a variable
4797 the computations will be done in the proper mode. */
4798 itype = fold (build (MINUS_EXPR, index_type,
4799 convert (index_type, size),
4800 convert (index_type, size_one_node)));
4802 /* If that overflowed, the array is too big.
4803 ??? While a size of INT_MAX+1 technically shouldn't cause
4804 an overflow (because we subtract 1), the overflow is recorded
4805 during the conversion to index_type, before the subtraction.
4806 Handling this case seems like an unnecessary complication. */
4807 if (TREE_OVERFLOW (itype))
4809 error ("size of array `%s' is too large", name);
4810 type = error_mark_node;
4815 itype = variable_size (itype);
4816 itype = build_index_type (itype);
4819 #if 0 /* This had bad results for pointers to arrays, as in
4820 union incomplete (*foo)[4]; */
4821 /* Complain about arrays of incomplete types, except in typedefs. */
4823 if (TYPE_SIZE (type) == 0
4824 /* Avoid multiple warnings for nested array types. */
4825 && TREE_CODE (type) != ARRAY_TYPE
4826 && !(specbits & (1 << (int) RID_TYPEDEF))
4827 && !C_TYPE_BEING_DEFINED (type))
4828 warning ("array type has incomplete element type");
4831 #if 0 /* We shouldn't have a function type here at all!
4832 Functions aren't allowed as array elements. */
4833 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4834 && (constp || volatilep))
4835 pedwarn ("ANSI C forbids const or volatile function types");
4838 /* Build the array type itself, then merge any constancy or
4839 volatility into the target type. We must do it in this order
4840 to ensure that the TYPE_MAIN_VARIANT field of the array type
4841 is set correctly. */
4843 type = build_array_type (type, itype);
4844 if (constp || volatilep)
4845 type = c_build_type_variant (type, constp, volatilep);
4847 #if 0 /* don't clear these; leave them set so that the array type
4848 or the variable is itself const or volatile. */
4854 C_TYPE_VARIABLE_SIZE (type) = 1;
4856 else if (TREE_CODE (declarator) == CALL_EXPR)
4858 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4859 || current_binding_level == global_binding_level);
4862 /* Declaring a function type.
4863 Make sure we have a valid type for the function to return. */
4864 if (type == error_mark_node)
4869 /* Warn about some types functions can't return. */
4871 if (TREE_CODE (type) == FUNCTION_TYPE)
4873 error ("`%s' declared as function returning a function", name);
4874 type = integer_type_node;
4876 if (TREE_CODE (type) == ARRAY_TYPE)
4878 error ("`%s' declared as function returning an array", name);
4879 type = integer_type_node;
4882 #ifndef TRADITIONAL_RETURN_FLOAT
4883 /* Traditionally, declaring return type float means double. */
4885 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4886 type = double_type_node;
4887 #endif /* TRADITIONAL_RETURN_FLOAT */
4889 /* If this is a block level extern, it must live past the end
4890 of the function so that we can check it against other extern
4891 declarations (IDENTIFIER_LIMBO_VALUE). */
4892 if (extern_ref && allocation_temporary_p ())
4893 end_temporary_allocation ();
4895 /* Construct the function type and go to the next
4896 inner layer of declarator. */
4898 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4900 /* Say it's a definition
4901 only for the CALL_EXPR
4902 closest to the identifier. */
4903 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4904 #if 0 /* This seems to be false. We turn off temporary allocation
4905 above in this function if -traditional.
4906 And this code caused inconsistent results with prototypes:
4907 callers would ignore them, and pass arguments wrong. */
4909 /* Omit the arg types if -traditional, since the arg types
4910 and the list links might not be permanent. */
4911 type = build_function_type (type,
4913 ? NULL_TREE : arg_types);
4915 /* ANSI seems to say that `const int foo ();'
4916 does not make the function foo const. */
4917 if (constp || volatilep)
4918 type = c_build_type_variant (type, constp, volatilep);
4922 type = build_function_type (type, arg_types);
4923 declarator = TREE_OPERAND (declarator, 0);
4925 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4926 the formal parameter list of this FUNCTION_TYPE to point to
4927 the FUNCTION_TYPE node itself. */
4932 for (link = last_function_parm_tags;
4934 link = TREE_CHAIN (link))
4935 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4938 else if (TREE_CODE (declarator) == INDIRECT_REF)
4940 /* Merge any constancy or volatility into the target type
4943 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4944 && (constp || volatilep))
4945 pedwarn ("ANSI C forbids const or volatile function types");
4946 if (constp || volatilep)
4947 type = c_build_type_variant (type, constp, volatilep);
4952 type = build_pointer_type (type);
4954 /* Process a list of type modifier keywords
4955 (such as const or volatile) that were given inside the `*'. */
4957 if (TREE_TYPE (declarator))
4959 register tree typemodlist;
4961 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4962 typemodlist = TREE_CHAIN (typemodlist))
4964 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4966 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4971 error ("invalid type modifier within pointer declarator");
4975 pedwarn ("duplicate `const'");
4977 pedwarn ("duplicate `volatile'");
4980 declarator = TREE_OPERAND (declarator, 0);
4987 /* Now TYPE has the actual type. */
4989 /* Did array size calculations overflow? */
4991 if (TREE_CODE (type) == ARRAY_TYPE
4993 && TREE_OVERFLOW (TYPE_SIZE (type)))
4994 error ("size of array `%s' is too large", name);
4996 /* If this is declaring a typedef name, return a TYPE_DECL. */
4998 if (specbits & (1 << (int) RID_TYPEDEF))
5001 /* Note that the grammar rejects storage classes
5002 in typenames, fields or parameters */
5003 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5004 && (constp || volatilep))
5005 pedwarn ("ANSI C forbids const or volatile function types");
5006 if (constp || volatilep)
5007 type = c_build_type_variant (type, constp, volatilep);
5008 decl = build_decl (TYPE_DECL, declarator, type);
5009 if ((specbits & (1 << (int) RID_SIGNED))
5010 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5011 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5016 /* Detect the case of an array type of unspecified size
5017 which came, as such, direct from a typedef name.
5018 We must copy the type, so that each identifier gets
5019 a distinct type, so that each identifier's size can be
5020 controlled separately by its own initializer. */
5022 if (type != 0 && typedef_type != 0
5023 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5024 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5026 type = build_array_type (TREE_TYPE (type), 0);
5028 C_TYPE_VARIABLE_SIZE (type) = 1;
5031 /* If this is a type name (such as, in a cast or sizeof),
5032 compute the type and return it now. */
5034 if (decl_context == TYPENAME)
5036 /* Note that the grammar rejects storage classes
5037 in typenames, fields or parameters */
5038 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5039 && (constp || volatilep))
5040 pedwarn ("ANSI C forbids const or volatile function types");
5041 if (constp || volatilep)
5042 type = c_build_type_variant (type, constp, volatilep);
5047 /* Aside from typedefs and type names (handle above),
5048 `void' at top level (not within pointer)
5049 is allowed only in public variables.
5050 We don't complain about parms either, but that is because
5051 a better error message can be made later. */
5053 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5054 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5055 && ((specbits & (1 << (int) RID_EXTERN))
5056 || (current_binding_level == global_binding_level
5058 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5060 error ("variable or field `%s' declared void", name);
5061 type = integer_type_node;
5064 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5065 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5070 if (decl_context == PARM)
5072 tree type_as_written = type;
5075 /* A parameter declared as an array of T is really a pointer to T.
5076 One declared as a function is really a pointer to a function. */
5078 if (TREE_CODE (type) == ARRAY_TYPE)
5080 /* Transfer const-ness of array into that of type pointed to. */
5081 type = TREE_TYPE (type);
5082 if (constp || volatilep)
5083 type = c_build_type_variant (type, constp, volatilep);
5084 type = build_pointer_type (type);
5085 volatilep = constp = 0;
5088 else if (TREE_CODE (type) == FUNCTION_TYPE)
5090 if (pedantic && (constp || volatilep))
5091 pedwarn ("ANSI C forbids const or volatile function types");
5092 if (constp || volatilep)
5093 type = c_build_type_variant (type, constp, volatilep);
5094 type = build_pointer_type (type);
5095 volatilep = constp = 0;
5098 decl = build_decl (PARM_DECL, declarator, type);
5100 C_DECL_VARIABLE_SIZE (decl) = 1;
5102 /* Compute the type actually passed in the parmlist,
5103 for the case where there is no prototype.
5104 (For example, shorts and chars are passed as ints.)
5105 When there is a prototype, this is overridden later. */
5107 DECL_ARG_TYPE (decl) = type;
5108 main_type = (type == error_mark_node
5110 : TYPE_MAIN_VARIANT (type));
5111 if (main_type == float_type_node)
5112 DECL_ARG_TYPE (decl) = double_type_node;
5113 /* Don't use TYPE_PRECISION to decide whether to promote,
5114 because we should convert short if it's the same size as int,
5115 but we should not convert long if it's the same size as int. */
5116 else if (TREE_CODE (main_type) != ERROR_MARK
5117 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5119 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5120 && TREE_UNSIGNED (type))
5121 DECL_ARG_TYPE (decl) = unsigned_type_node;
5123 DECL_ARG_TYPE (decl) = integer_type_node;
5126 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5128 else if (decl_context == FIELD)
5130 /* Structure field. It may not be a function. */
5132 if (TREE_CODE (type) == FUNCTION_TYPE)
5134 error ("field `%s' declared as a function", name);
5135 type = build_pointer_type (type);
5137 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5139 error ("field `%s' has incomplete type", name);
5140 type = error_mark_node;
5142 /* Move type qualifiers down to element of an array. */
5143 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5145 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5147 TYPE_DOMAIN (type));
5148 #if 0 /* Leave the field const or volatile as well. */
5149 constp = volatilep = 0;
5152 decl = build_decl (FIELD_DECL, declarator, type);
5154 C_DECL_VARIABLE_SIZE (decl) = 1;
5156 else if (TREE_CODE (type) == FUNCTION_TYPE)
5158 /* Every function declaration is "external"
5159 except for those which are inside a function body
5160 in which `auto' is used.
5161 That is a case not specified by ANSI C,
5162 and we use it for forward declarations for nested functions. */
5163 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5164 || current_binding_level == global_binding_level);
5166 if (specbits & (1 << (int) RID_AUTO)
5167 && (pedantic || current_binding_level == global_binding_level))
5168 pedwarn ("invalid storage class for function `%s'", name);
5169 if (specbits & (1 << (int) RID_REGISTER))
5170 error ("invalid storage class for function `%s'", name);
5171 /* Function declaration not at top level.
5172 Storage classes other than `extern' are not allowed
5173 and `extern' makes no difference. */
5174 if (current_binding_level != global_binding_level
5175 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5177 pedwarn ("invalid storage class for function `%s'", name);
5179 /* If this is a block level extern, it must live past the end
5180 of the function so that we can check it against other
5181 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5182 if (extern_ref && allocation_temporary_p ())
5183 end_temporary_allocation ();
5185 decl = build_decl (FUNCTION_DECL, declarator, type);
5186 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5188 if (pedantic && (constp || volatilep)
5189 && ! DECL_IN_SYSTEM_HEADER (decl))
5190 pedwarn ("ANSI C forbids const or volatile functions");
5193 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5194 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5195 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5196 && ! DECL_IN_SYSTEM_HEADER (decl))
5197 pedwarn ("ANSI C forbids const or volatile void function return type");
5200 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5201 warning ("`noreturn' function returns non-void value");
5204 DECL_EXTERNAL (decl) = 1;
5205 /* Record absence of global scope for `static' or `auto'. */
5207 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5209 /* Record presence of `inline', if it is reasonable. */
5212 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5213 warning ("cannot inline function `main'");
5215 /* Assume that otherwise the function can be inlined. */
5216 DECL_INLINE (decl) = 1;
5218 if (specbits & (1 << (int) RID_EXTERN))
5219 current_extern_inline = 1;
5224 /* It's a variable. */
5225 /* An uninitialized decl with `extern' is a reference. */
5226 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5228 /* Move type qualifiers down to element of an array. */
5229 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5231 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5233 TYPE_DOMAIN (type));
5234 #if 0 /* Leave the variable const or volatile as well. */
5235 constp = volatilep = 0;
5239 /* If this is a block level extern, it must live past the end
5240 of the function so that we can check it against other
5241 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5242 if (extern_ref && allocation_temporary_p ())
5243 end_temporary_allocation ();
5245 decl = build_decl (VAR_DECL, declarator, type);
5247 C_DECL_VARIABLE_SIZE (decl) = 1;
5250 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5252 DECL_EXTERNAL (decl) = extern_ref;
5253 /* At top level, the presence of a `static' or `register' storage
5254 class specifier, or the absence of all storage class specifiers
5255 makes this declaration a definition (perhaps tentative). Also,
5256 the absence of both `static' and `register' makes it public. */
5257 if (current_binding_level == global_binding_level)
5261 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5262 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5264 /* Not at top level, only `static' makes a static definition. */
5267 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5268 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5271 if (specbits & 1 << (int) RID_ITERATOR)
5272 ITERATOR_P (decl) = 1;
5275 /* Record `register' declaration for warnings on &
5276 and in case doing stupid register allocation. */
5278 if (specbits & (1 << (int) RID_REGISTER))
5279 DECL_REGISTER (decl) = 1;
5281 /* Record constancy and volatility. */
5284 TREE_READONLY (decl) = 1;
5287 TREE_SIDE_EFFECTS (decl) = 1;
5288 TREE_THIS_VOLATILE (decl) = 1;
5290 /* If a type has volatile components, it should be stored in memory.
5291 Otherwise, the fact that those components are volatile
5292 will be ignored, and would even crash the compiler. */
5293 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5294 mark_addressable (decl);
5302 /* Decode the parameter-list info for a function type or function definition.
5303 The argument is the value returned by `get_parm_info' (or made in parse.y
5304 if there is an identifier list instead of a parameter decl list).
5305 These two functions are separate because when a function returns
5306 or receives functions then each is called multiple times but the order
5307 of calls is different. The last call to `grokparms' is always the one
5308 that contains the formal parameter names of a function definition.
5310 Store in `last_function_parms' a chain of the decls of parms.
5311 Also store in `last_function_parm_tags' a chain of the struct, union,
5312 and enum tags declared among the parms.
5314 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5316 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5317 a mere declaration. A nonempty identifier-list gets an error message
5318 when FUNCDEF_FLAG is zero. */
5321 grokparms (parms_info, funcdef_flag)
5325 tree first_parm = TREE_CHAIN (parms_info);
5327 last_function_parms = TREE_PURPOSE (parms_info);
5328 last_function_parm_tags = TREE_VALUE (parms_info);
5330 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5331 && !in_system_header)
5332 warning ("function declaration isn't a prototype");
5335 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5338 pedwarn ("parameter names (without types) in function declaration");
5340 last_function_parms = first_parm;
5347 /* We no longer test FUNCDEF_FLAG.
5348 If the arg types are incomplete in a declaration,
5349 they must include undefined tags.
5350 These tags can never be defined in the scope of the declaration,
5351 so the types can never be completed,
5352 and no call can be compiled successfully. */
5354 /* In a fcn definition, arg types must be complete. */
5357 for (parm = last_function_parms, typelt = first_parm;
5359 parm = TREE_CHAIN (parm))
5360 /* Skip over any enumeration constants declared here. */
5361 if (TREE_CODE (parm) == PARM_DECL)
5363 /* Barf if the parameter itself has an incomplete type. */
5364 tree type = TREE_VALUE (typelt);
5365 if (TYPE_SIZE (type) == 0)
5367 if (funcdef_flag && DECL_NAME (parm) != 0)
5368 error ("parameter `%s' has incomplete type",
5369 IDENTIFIER_POINTER (DECL_NAME (parm)));
5371 warning ("parameter has incomplete type");
5374 TREE_VALUE (typelt) = error_mark_node;
5375 TREE_TYPE (parm) = error_mark_node;
5378 #if 0 /* This has been replaced by parm_tags_warning
5379 which uses a more accurate criterion for what to warn about. */
5382 /* Now warn if is a pointer to an incomplete type. */
5383 while (TREE_CODE (type) == POINTER_TYPE
5384 || TREE_CODE (type) == REFERENCE_TYPE)
5385 type = TREE_TYPE (type);
5386 type = TYPE_MAIN_VARIANT (type);
5387 if (TYPE_SIZE (type) == 0)
5389 if (DECL_NAME (parm) != 0)
5390 warning ("parameter `%s' points to incomplete type",
5391 IDENTIFIER_POINTER (DECL_NAME (parm)));
5393 warning ("parameter points to incomplete type");
5397 typelt = TREE_CHAIN (typelt);
5400 /* Allocate the list of types the way we allocate a type. */
5401 if (first_parm && ! TREE_PERMANENT (first_parm))
5403 /* Construct a copy of the list of types
5404 on the saveable obstack. */
5406 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5407 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5409 return nreverse (result);
5412 /* The list we have is permanent already. */
5418 /* Return a tree_list node with info on a parameter list just parsed.
5419 The TREE_PURPOSE is a chain of decls of those parms.
5420 The TREE_VALUE is a list of structure, union and enum tags defined.
5421 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5422 This tree_list node is later fed to `grokparms'.
5424 VOID_AT_END nonzero means append `void' to the end of the type-list.
5425 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5428 get_parm_info (void_at_end)
5431 register tree decl, t;
5432 register tree types = 0;
5434 tree tags = gettags ();
5435 tree parms = getdecls ();
5437 tree order = current_binding_level->parm_order;
5439 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5440 if (void_at_end && parms != 0
5441 && TREE_CHAIN (parms) == 0
5442 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5443 && DECL_NAME (parms) == 0)
5446 storedecls (NULL_TREE);
5447 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5448 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5451 /* Extract enumerator values and other non-parms declared with the parms.
5452 Likewise any forward parm decls that didn't have real parm decls. */
5453 for (decl = parms; decl; )
5455 tree next = TREE_CHAIN (decl);
5457 if (TREE_CODE (decl) != PARM_DECL)
5459 TREE_CHAIN (decl) = new_parms;
5462 else if (TREE_ASM_WRITTEN (decl))
5464 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5465 TREE_CHAIN (decl) = new_parms;
5471 /* Put the parm decls back in the order they were in in the parm list. */
5472 for (t = order; t; t = TREE_CHAIN (t))
5475 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5477 TREE_CHAIN (TREE_VALUE (t)) = 0;
5480 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5483 /* Store the parmlist in the binding level since the old one
5484 is no longer a valid list. (We have changed the chain pointers.) */
5485 storedecls (new_parms);
5487 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5488 /* There may also be declarations for enumerators if an enumeration
5489 type is declared among the parms. Ignore them here. */
5490 if (TREE_CODE (decl) == PARM_DECL)
5492 /* Since there is a prototype,
5493 args are passed in their declared types. */
5494 tree type = TREE_TYPE (decl);
5495 DECL_ARG_TYPE (decl) = type;
5496 #ifdef PROMOTE_PROTOTYPES
5497 if ((TREE_CODE (type) == INTEGER_TYPE
5498 || TREE_CODE (type) == ENUMERAL_TYPE)
5499 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5500 DECL_ARG_TYPE (decl) = integer_type_node;
5503 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5504 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5505 && DECL_NAME (decl) == 0)
5507 error ("`void' in parameter list must be the entire list");
5513 return saveable_tree_cons (new_parms, tags,
5514 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5516 return saveable_tree_cons (new_parms, tags, nreverse (types));
5519 /* At end of parameter list, warn about any struct, union or enum tags
5520 defined within. Do so because these types cannot ever become complete. */
5523 parmlist_tags_warning ()
5528 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5530 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5531 /* An anonymous union parm type is meaningful as a GNU extension.
5532 So don't warn for that. */
5533 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5535 if (TREE_PURPOSE (elt) != 0)
5536 warning ("`%s %s' declared inside parameter list",
5537 (code == RECORD_TYPE ? "struct"
5538 : code == UNION_TYPE ? "union"
5540 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5542 warning ("anonymous %s declared inside parameter list",
5543 (code == RECORD_TYPE ? "struct"
5544 : code == UNION_TYPE ? "union"
5549 warning ("its scope is only this definition or declaration,");
5550 warning ("which is probably not what you want.");
5556 /* Get the struct, enum or union (CODE says which) with tag NAME.
5557 Define the tag as a forward-reference if it is not defined. */
5560 xref_tag (code, name)
5561 enum tree_code code;
5564 int temporary = allocation_temporary_p ();
5566 /* If a cross reference is requested, look up the type
5567 already defined for this tag and return it. */
5569 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5570 /* Even if this is the wrong type of tag, return what we found.
5571 There will be an error message anyway, from pending_xref_error.
5572 If we create an empty xref just for an invalid use of the type,
5573 the main result is to create lots of superfluous error messages. */
5577 push_obstacks_nochange ();
5579 if (current_binding_level == global_binding_level && temporary)
5580 end_temporary_allocation ();
5582 /* If no such tag is yet defined, create a forward-reference node
5583 and record it as the "definition".
5584 When a real declaration of this type is found,
5585 the forward-reference will be altered into a real type. */
5587 ref = make_node (code);
5588 if (code == ENUMERAL_TYPE)
5590 /* (In ANSI, Enums can be referred to only if already defined.) */
5592 pedwarn ("ANSI C forbids forward references to `enum' types");
5593 /* Give the type a default layout like unsigned int
5594 to avoid crashing if it does not get defined. */
5595 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5596 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5597 TREE_UNSIGNED (ref) = 1;
5598 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5599 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5600 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5603 pushtag (name, ref);
5610 /* Make sure that the tag NAME is defined *in the current binding level*
5611 at least as a forward reference.
5612 CODE says which kind of tag NAME ought to be.
5614 We also do a push_obstacks_nochange
5615 whose matching pop is in finish_struct. */
5618 start_struct (code, name)
5619 enum tree_code code;
5622 /* If there is already a tag defined at this binding level
5623 (as a forward reference), just return it. */
5625 register tree ref = 0;
5627 push_obstacks_nochange ();
5628 if (current_binding_level == global_binding_level)
5629 end_temporary_allocation ();
5632 ref = lookup_tag (code, name, current_binding_level, 1);
5633 if (ref && TREE_CODE (ref) == code)
5635 C_TYPE_BEING_DEFINED (ref) = 1;
5636 TYPE_PACKED (ref) = flag_pack_struct;
5637 if (TYPE_FIELDS (ref))
5638 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5639 : "redefinition of `struct %s'"),
5640 IDENTIFIER_POINTER (name));
5645 /* Otherwise create a forward-reference just so the tag is in scope. */
5647 ref = make_node (code);
5648 pushtag (name, ref);
5649 C_TYPE_BEING_DEFINED (ref) = 1;
5650 TYPE_PACKED (ref) = flag_pack_struct;
5654 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5655 of a structure component, returning a FIELD_DECL node.
5656 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5658 This is done during the parsing of the struct declaration.
5659 The FIELD_DECL nodes are chained together and the lot of them
5660 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5663 grokfield (filename, line, declarator, declspecs, width)
5666 tree declarator, declspecs, width;
5670 /* The corresponding pop_obstacks is in finish_decl. */
5671 push_obstacks_nochange ();
5673 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5675 finish_decl (value, NULL_TREE, NULL_TREE);
5676 DECL_INITIAL (value) = width;
5678 maybe_objc_check_decl (value);
5682 /* Function to help qsort sort FIELD_DECLs by name order. */
5685 field_decl_cmp (xp, yp)
5686 const GENERIC_PTR xp;
5687 const GENERIC_PTR yp;
5689 tree *x = (tree *)xp, *y = (tree *)yp;
5691 if (DECL_NAME (*x) == DECL_NAME (*y))
5693 if (DECL_NAME (*x) == NULL)
5695 if (DECL_NAME (*y) == NULL)
5697 if (DECL_NAME (*x) < DECL_NAME (*y))
5702 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5703 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5704 ATTRIBUTES are attributes to be applied to the structure.
5706 We also do a pop_obstacks to match the push in start_struct. */
5709 finish_struct (t, fieldlist, attributes)
5716 int toplevel = global_binding_level == current_binding_level;
5718 /* If this type was previously laid out as a forward reference,
5719 make sure we lay it out again. */
5723 decl_attributes (t, attributes, NULL_TREE);
5725 /* Nameless union parm types are useful as GCC extension. */
5726 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5727 /* Otherwise, warn about any struct or union def. in parmlist. */
5728 if (in_parm_level_p ())
5731 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5732 : "structure defined inside parms"));
5733 else if (! flag_traditional)
5734 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5735 : "structure defined inside parms"));
5738 old_momentary = suspend_momentary ();
5742 for (x = fieldlist; x; x = TREE_CHAIN (x))
5743 if (DECL_NAME (x) != 0)
5747 pedwarn ("%s has no %smembers",
5748 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5749 (fieldlist ? "named " : ""));
5752 /* Install struct as DECL_CONTEXT of each field decl.
5753 Also process specified field sizes.
5754 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5755 The specified size is found in the DECL_INITIAL.
5756 Store 0 there, except for ": 0" fields (so we can find them
5757 and delete them, below). */
5759 for (x = fieldlist; x; x = TREE_CHAIN (x))
5761 DECL_CONTEXT (x) = t;
5762 DECL_PACKED (x) |= TYPE_PACKED (t);
5763 DECL_FIELD_SIZE (x) = 0;
5765 /* If any field is const, the structure type is pseudo-const. */
5766 if (TREE_READONLY (x))
5767 C_TYPE_FIELDS_READONLY (t) = 1;
5770 /* A field that is pseudo-const makes the structure likewise. */
5771 tree t1 = TREE_TYPE (x);
5772 while (TREE_CODE (t1) == ARRAY_TYPE)
5773 t1 = TREE_TYPE (t1);
5774 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5775 && C_TYPE_FIELDS_READONLY (t1))
5776 C_TYPE_FIELDS_READONLY (t) = 1;
5779 /* Any field that is volatile means variables of this type must be
5780 treated in some ways as volatile. */
5781 if (TREE_THIS_VOLATILE (x))
5782 C_TYPE_FIELDS_VOLATILE (t) = 1;
5784 /* Any field of nominal variable size implies structure is too. */
5785 if (C_DECL_VARIABLE_SIZE (x))
5786 C_TYPE_VARIABLE_SIZE (t) = 1;
5788 /* Detect invalid nested redefinition. */
5789 if (TREE_TYPE (x) == t)
5790 error ("nested redefinition of `%s'",
5791 IDENTIFIER_POINTER (TYPE_NAME (t)));
5793 /* Detect invalid bit-field size. */
5794 if (DECL_INITIAL (x))
5795 STRIP_NOPS (DECL_INITIAL (x));
5796 if (DECL_INITIAL (x))
5798 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5799 constant_expression_warning (DECL_INITIAL (x));
5802 error_with_decl (x, "bit-field `%s' width not an integer constant");
5803 DECL_INITIAL (x) = NULL;
5807 /* Detect invalid bit-field type. */
5808 if (DECL_INITIAL (x)
5809 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5810 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5812 error_with_decl (x, "bit-field `%s' has invalid type");
5813 DECL_INITIAL (x) = NULL;
5815 if (DECL_INITIAL (x) && pedantic
5816 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5817 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5818 /* Accept an enum that's equivalent to int or unsigned int. */
5819 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5820 && (TYPE_PRECISION (TREE_TYPE (x))
5821 == TYPE_PRECISION (integer_type_node))))
5822 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5824 /* Detect and ignore out of range field width. */
5825 if (DECL_INITIAL (x))
5827 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5829 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5831 DECL_INITIAL (x) = NULL;
5832 error_with_decl (x, "negative width in bit-field `%s'");
5834 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5835 || width > TYPE_PRECISION (TREE_TYPE (x)))
5837 DECL_INITIAL (x) = NULL;
5838 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5840 else if (width == 0 && DECL_NAME (x) != 0)
5842 error_with_decl (x, "zero width for bit-field `%s'");
5843 DECL_INITIAL (x) = NULL;
5847 /* Process valid field width. */
5848 if (DECL_INITIAL (x))
5850 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5852 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5853 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5854 TREE_UNSIGNED (TREE_TYPE (x)))
5855 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5856 TREE_UNSIGNED (TREE_TYPE (x)))))
5857 warning_with_decl (x, "`%s' is narrower than values of its type");
5859 DECL_FIELD_SIZE (x) = width;
5860 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5861 DECL_INITIAL (x) = NULL;
5865 /* field size 0 => force desired amount of alignment. */
5866 #ifdef EMPTY_FIELD_BOUNDARY
5867 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5869 #ifdef PCC_BITFIELD_TYPE_MATTERS
5870 if (PCC_BITFIELD_TYPE_MATTERS)
5871 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5872 TYPE_ALIGN (TREE_TYPE (x)));
5876 else if (TREE_TYPE (x) != error_mark_node)
5878 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5879 : TYPE_ALIGN (TREE_TYPE (x)));
5880 /* Non-bit-fields are aligned for their type, except packed
5881 fields which require only BITS_PER_UNIT alignment. */
5882 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5886 /* Now DECL_INITIAL is null on all members. */
5888 /* Delete all duplicate fields from the fieldlist */
5889 for (x = fieldlist; x && TREE_CHAIN (x);)
5890 /* Anonymous fields aren't duplicates. */
5891 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5895 register tree y = fieldlist;
5899 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5905 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5907 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5908 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5910 else x = TREE_CHAIN (x);
5913 /* Now we have the nearly final fieldlist. Record it,
5914 then lay out the structure or union (including the fields). */
5916 TYPE_FIELDS (t) = fieldlist;
5920 /* Delete all zero-width bit-fields from the front of the fieldlist */
5922 && DECL_INITIAL (fieldlist))
5923 fieldlist = TREE_CHAIN (fieldlist);
5924 /* Delete all such members from the rest of the fieldlist */
5925 for (x = fieldlist; x;)
5927 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5928 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5929 else x = TREE_CHAIN (x);
5932 /* Now we have the truly final field list.
5933 Store it in this type and in the variants. */
5935 TYPE_FIELDS (t) = fieldlist;
5937 /* If there are lots of fields, sort so we can look through them fast.
5938 We arbitrarily consider 16 or more elts to be "a lot". */
5942 for (x = fieldlist; x; x = TREE_CHAIN (x))
5953 len += list_length (x);
5954 /* Use the same allocation policy here that make_node uses, to
5955 ensure that this lives as long as the rest of the struct decl.
5956 All decls in an inline function need to be saved. */
5957 if (allocation_temporary_p ())
5958 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5960 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5962 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5963 TYPE_LANG_SPECIFIC (t)->len = len;
5965 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5967 for (x = fieldlist; x; x = TREE_CHAIN (x))
5968 field_array[len++] = x;
5970 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5974 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5976 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5977 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5978 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5981 /* If this was supposed to be a transparent union, but we can't
5982 make it one, warn and turn off the flag. */
5983 if (TREE_CODE (t) == UNION_TYPE
5984 && TYPE_TRANSPARENT_UNION (t)
5985 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5987 TYPE_TRANSPARENT_UNION (t) = 0;
5988 warning ("union cannot be made transparent");
5991 /* If this structure or union completes the type of any previous
5992 variable declaration, lay it out and output its rtl. */
5994 if (current_binding_level->n_incomplete != 0)
5997 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5999 if (TREE_TYPE (decl) == t
6000 && TREE_CODE (decl) != TYPE_DECL)
6002 layout_decl (decl, 0);
6003 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6004 maybe_objc_check_decl (decl);
6005 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6008 --current_binding_level->n_incomplete;
6010 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6011 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6013 tree element = TREE_TYPE (decl);
6014 while (TREE_CODE (element) == ARRAY_TYPE)
6015 element = TREE_TYPE (element);
6017 layout_array_type (TREE_TYPE (decl));
6022 resume_momentary (old_momentary);
6024 /* Finish debugging output for this type. */
6025 rest_of_type_compilation (t, toplevel);
6027 /* The matching push is in start_struct. */
6033 /* Lay out the type T, and its element type, and so on. */
6036 layout_array_type (t)
6039 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6040 layout_array_type (TREE_TYPE (t));
6044 /* Begin compiling the definition of an enumeration type.
6045 NAME is its name (or null if anonymous).
6046 Returns the type object, as yet incomplete.
6047 Also records info about it so that build_enumerator
6048 may be used to declare the individual values as they are read. */
6054 register tree enumtype = 0;
6056 /* If this is the real definition for a previous forward reference,
6057 fill in the contents in the same object that used to be the
6058 forward reference. */
6061 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6063 /* The corresponding pop_obstacks is in finish_enum. */
6064 push_obstacks_nochange ();
6065 /* If these symbols and types are global, make them permanent. */
6066 if (current_binding_level == global_binding_level)
6067 end_temporary_allocation ();
6069 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6071 enumtype = make_node (ENUMERAL_TYPE);
6072 pushtag (name, enumtype);
6075 C_TYPE_BEING_DEFINED (enumtype) = 1;
6077 if (TYPE_VALUES (enumtype) != 0)
6079 /* This enum is a named one that has been declared already. */
6080 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6082 /* Completely replace its old definition.
6083 The old enumerators remain defined, however. */
6084 TYPE_VALUES (enumtype) = 0;
6087 enum_next_value = integer_zero_node;
6090 if (flag_short_enums)
6091 TYPE_PACKED (enumtype) = 1;
6096 /* After processing and defining all the values of an enumeration type,
6097 install their decls in the enumeration type and finish it off.
6098 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6099 and ATTRIBUTES are the specified attributes.
6100 Returns ENUMTYPE. */
6103 finish_enum (enumtype, values, attributes)
6108 register tree pair, tem;
6109 tree minnode = 0, maxnode = 0;
6110 int lowprec, highprec, precision;
6111 int toplevel = global_binding_level == current_binding_level;
6113 if (in_parm_level_p ())
6114 warning ("enum defined inside parms");
6116 decl_attributes (enumtype, attributes, NULL_TREE);
6118 /* Calculate the maximum value of any enumerator in this type. */
6120 if (values == error_mark_node)
6121 minnode = maxnode = integer_zero_node;
6123 for (pair = values; pair; pair = TREE_CHAIN (pair))
6125 tree value = TREE_VALUE (pair);
6127 minnode = maxnode = TREE_VALUE (pair);
6130 if (tree_int_cst_lt (maxnode, value))
6132 if (tree_int_cst_lt (value, minnode))
6137 TYPE_MIN_VALUE (enumtype) = minnode;
6138 TYPE_MAX_VALUE (enumtype) = maxnode;
6140 /* An enum can have some negative values; then it is signed. */
6141 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6143 /* Determine the precision this type needs. */
6145 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6146 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6147 precision = MAX (lowprec, highprec);
6149 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6151 tree narrowest = type_for_size (precision, 1);
6154 warning ("enumeration values exceed range of largest integer");
6155 narrowest = long_long_integer_type_node;
6158 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6161 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6163 TYPE_SIZE (enumtype) = 0;
6164 layout_type (enumtype);
6166 if (values != error_mark_node)
6168 /* Change the type of the enumerators to be the enum type.
6169 Formerly this was done only for enums that fit in an int,
6170 but the comment said it was done only for enums wider than int.
6171 It seems necessary to do this for wide enums,
6172 and best not to change what's done for ordinary narrower ones. */
6173 for (pair = values; pair; pair = TREE_CHAIN (pair))
6175 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6176 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6177 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6178 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6181 /* Replace the decl nodes in VALUES with their names. */
6182 for (pair = values; pair; pair = TREE_CHAIN (pair))
6183 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6185 TYPE_VALUES (enumtype) = values;
6188 /* Fix up all variant types of this enum type. */
6189 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6191 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6192 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6193 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6194 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6195 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6196 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6197 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6198 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6201 /* Finish debugging output for this type. */
6202 rest_of_type_compilation (enumtype, toplevel);
6204 /* This matches a push in start_enum. */
6210 /* Build and install a CONST_DECL for one value of the
6211 current enumeration type (one that was begun with start_enum).
6212 Return a tree-list containing the CONST_DECL and its value.
6213 Assignment of sequential values by default is handled here. */
6216 build_enumerator (name, value)
6219 register tree decl, type;
6221 /* Validate and default VALUE. */
6223 /* Remove no-op casts from the value. */
6225 STRIP_TYPE_NOPS (value);
6229 if (TREE_CODE (value) == INTEGER_CST)
6231 value = default_conversion (value);
6232 constant_expression_warning (value);
6236 error ("enumerator value for `%s' not integer constant",
6237 IDENTIFIER_POINTER (name));
6242 /* Default based on previous value. */
6243 /* It should no longer be possible to have NON_LVALUE_EXPR
6247 value = enum_next_value;
6249 error ("overflow in enumeration values");
6252 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6254 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6255 value = integer_zero_node;
6258 /* Set basis for default for next value. */
6259 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6260 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6262 /* Now create a declaration for the enum value name. */
6264 type = TREE_TYPE (value);
6265 type = type_for_size (MAX (TYPE_PRECISION (type),
6266 TYPE_PRECISION (integer_type_node)),
6268 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6269 && TREE_UNSIGNED (type)));
6271 decl = build_decl (CONST_DECL, name, type);
6272 DECL_INITIAL (decl) = value;
6273 TREE_TYPE (value) = type;
6276 return saveable_tree_cons (decl, value, NULL_TREE);
6279 /* Create the FUNCTION_DECL for a function definition.
6280 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6281 the declaration; they describe the function's name and the type it returns,
6282 but twisted together in a fashion that parallels the syntax of C.
6284 This function creates a binding context for the function body
6285 as well as setting up the FUNCTION_DECL in current_function_decl.
6287 Returns 1 on success. If the DECLARATOR is not suitable for a function
6288 (it defines a datum instead), we return 0, which tells
6289 yyparse to report a parse error.
6291 NESTED is nonzero for a function nested within another function. */
6294 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6295 tree declarator, declspecs, prefix_attributes, attributes;
6298 tree decl1, old_decl;
6300 int old_immediate_size_expand = immediate_size_expand;
6302 current_function_returns_value = 0; /* Assume, until we see it does. */
6303 current_function_returns_null = 0;
6304 warn_about_return_type = 0;
6305 current_extern_inline = 0;
6306 c_function_varargs = 0;
6308 shadowed_labels = 0;
6310 /* Don't expand any sizes in the return type of the function. */
6311 immediate_size_expand = 0;
6313 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6315 /* If the declarator is not suitable for a function definition,
6316 cause a syntax error. */
6319 immediate_size_expand = old_immediate_size_expand;
6323 decl_attributes (decl1, prefix_attributes, attributes);
6325 announce_function (decl1);
6327 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6329 error ("return-type is an incomplete type");
6330 /* Make it return void instead. */
6332 = build_function_type (void_type_node,
6333 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6336 if (warn_about_return_type)
6337 warning ("return-type defaults to `int'");
6339 /* Save the parm names or decls from this function's declarator
6340 where store_parm_decls will find them. */
6341 current_function_parms = last_function_parms;
6342 current_function_parm_tags = last_function_parm_tags;
6344 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6345 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6346 DECL_INITIAL (decl1) = error_mark_node;
6348 /* If this definition isn't a prototype and we had a prototype declaration
6349 before, copy the arg type info from that prototype.
6350 But not if what we had before was a builtin function. */
6351 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6352 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6353 && !DECL_BUILT_IN (old_decl)
6354 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6355 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6356 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6358 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6359 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6360 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6363 /* If there is no explicit declaration, look for any out-of-scope implicit
6366 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6368 /* Optionally warn of old-fashioned def with no previous prototype. */
6369 if (warn_strict_prototypes
6370 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6371 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6372 warning ("function declaration isn't a prototype");
6373 /* Optionally warn of any global def with no previous prototype. */
6374 else if (warn_missing_prototypes
6375 && TREE_PUBLIC (decl1)
6376 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6377 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6378 warning_with_decl (decl1, "no previous prototype for `%s'");
6379 /* Optionally warn of any def with no previous prototype
6380 if the function has already been used. */
6381 else if (warn_missing_prototypes
6382 && old_decl != 0 && TREE_USED (old_decl)
6383 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6384 warning_with_decl (decl1,
6385 "`%s' was used with no prototype before its definition");
6386 /* Optionally warn of any global def with no previous declaration. */
6387 else if (warn_missing_declarations
6388 && TREE_PUBLIC (decl1)
6390 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6391 warning_with_decl (decl1, "no previous declaration for `%s'");
6392 /* Optionally warn of any def with no previous declaration
6393 if the function has already been used. */
6394 else if (warn_missing_declarations
6395 && old_decl != 0 && TREE_USED (old_decl)
6396 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6397 warning_with_decl (decl1,
6398 "`%s' was used with no declaration before its definition");
6400 /* This is a definition, not a reference.
6401 So normally clear DECL_EXTERNAL.
6402 However, `extern inline' acts like a declaration
6403 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6404 DECL_EXTERNAL (decl1) = current_extern_inline;
6406 /* This function exists in static storage.
6407 (This does not mean `static' in the C sense!) */
6408 TREE_STATIC (decl1) = 1;
6410 /* A nested function is not global. */
6411 if (current_function_decl != 0)
6412 TREE_PUBLIC (decl1) = 0;
6414 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6416 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6421 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6422 != integer_type_node)
6423 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6425 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6426 args = TREE_CHAIN (args))
6428 tree type = args ? TREE_VALUE (args) : 0;
6430 if (type == void_type_node)
6437 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6438 pedwarn_with_decl (decl1,
6439 "first argument of `%s' should be `int'");
6443 if (TREE_CODE (type) != POINTER_TYPE
6444 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6445 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6447 pedwarn_with_decl (decl1,
6448 "second argument of `%s' should be `char **'");
6452 if (TREE_CODE (type) != POINTER_TYPE
6453 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6454 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6456 pedwarn_with_decl (decl1,
6457 "third argument of `%s' should probably be `char **'");
6462 /* It is intentional that this message does not mention the third
6463 argument, which is warned for only pedantically, because it's
6464 blessed by mention in an appendix of the standard. */
6465 if (argct > 0 && (argct < 2 || argct > 3))
6466 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6468 if (argct == 3 && pedantic)
6469 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6471 if (! TREE_PUBLIC (decl1))
6472 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6475 /* Record the decl so that the function name is defined.
6476 If we already have a decl for this name, and it is a FUNCTION_DECL,
6477 use the old decl. */
6479 current_function_decl = pushdecl (decl1);
6482 declare_parm_level (1);
6483 current_binding_level->subblocks_tag_transparent = 1;
6485 make_function_rtl (current_function_decl);
6487 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6488 /* Promote the value to int before returning it. */
6489 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6491 /* It retains unsignedness if traditional
6492 or if not really getting wider. */
6493 if (TREE_UNSIGNED (restype)
6494 && (flag_traditional
6495 || (TYPE_PRECISION (restype)
6496 == TYPE_PRECISION (integer_type_node))))
6497 restype = unsigned_type_node;
6499 restype = integer_type_node;
6501 DECL_RESULT (current_function_decl)
6502 = build_decl (RESULT_DECL, NULL_TREE, restype);
6505 /* Allocate further tree nodes temporarily during compilation
6506 of this function only. */
6507 temporary_allocation ();
6509 /* If this fcn was already referenced via a block-scope `extern' decl
6510 (or an implicit decl), propagate certain information about the usage. */
6511 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6512 TREE_ADDRESSABLE (current_function_decl) = 1;
6514 immediate_size_expand = old_immediate_size_expand;
6519 /* Record that this function is going to be a varargs function.
6520 This is called before store_parm_decls, which is too early
6521 to call mark_varargs directly. */
6526 c_function_varargs = 1;
6529 /* Store the parameter declarations into the current function declaration.
6530 This is called after parsing the parameter declarations, before
6531 digesting the body of the function.
6533 For an old-style definition, modify the function's type
6534 to specify at least the number of arguments. */
6539 register tree fndecl = current_function_decl;
6542 /* This is either a chain of PARM_DECLs (if a prototype was used)
6543 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6544 tree specparms = current_function_parms;
6546 /* This is a list of types declared among parms in a prototype. */
6547 tree parmtags = current_function_parm_tags;
6549 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6550 register tree parmdecls = getdecls ();
6552 /* This is a chain of any other decls that came in among the parm
6553 declarations. If a parm is declared with enum {foo, bar} x;
6554 then CONST_DECLs for foo and bar are put here. */
6557 /* Nonzero if this definition is written with a prototype. */
6560 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6562 /* This case is when the function was defined with an ANSI prototype.
6563 The parms already have decls, so we need not do anything here
6564 except record them as in effect
6565 and complain if any redundant old-style parm decls were written. */
6576 error_with_decl (fndecl,
6577 "parm types given both in parmlist and separately");
6578 /* Get rid of the erroneous decls; don't keep them on
6579 the list of parms, since they might not be PARM_DECLs. */
6580 for (decl = current_binding_level->names;
6581 decl; decl = TREE_CHAIN (decl))
6582 if (DECL_NAME (decl))
6583 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6584 for (link = current_binding_level->shadowed;
6585 link; link = TREE_CHAIN (link))
6586 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6587 current_binding_level->names = 0;
6588 current_binding_level->shadowed = 0;
6591 specparms = nreverse (specparms);
6592 for (parm = specparms; parm; parm = next)
6594 next = TREE_CHAIN (parm);
6595 if (TREE_CODE (parm) == PARM_DECL)
6597 if (DECL_NAME (parm) == 0)
6598 error_with_decl (parm, "parameter name omitted");
6599 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6601 error_with_decl (parm, "parameter `%s' declared void");
6602 /* Change the type to error_mark_node so this parameter
6603 will be ignored by assign_parms. */
6604 TREE_TYPE (parm) = error_mark_node;
6610 /* If we find an enum constant or a type tag,
6611 put it aside for the moment. */
6612 TREE_CHAIN (parm) = 0;
6613 others = chainon (others, parm);
6617 /* Get the decls in their original chain order
6618 and record in the function. */
6619 DECL_ARGUMENTS (fndecl) = getdecls ();
6622 /* If this function takes a variable number of arguments,
6623 add a phony parameter to the end of the parm list,
6624 to represent the position of the first unnamed argument. */
6625 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6628 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6629 /* Let's hope the address of the unnamed parm
6630 won't depend on its type. */
6631 TREE_TYPE (dummy) = integer_type_node;
6632 DECL_ARG_TYPE (dummy) = integer_type_node;
6633 DECL_ARGUMENTS (fndecl)
6634 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6638 /* Now pushdecl the enum constants. */
6639 for (parm = others; parm; parm = next)
6641 next = TREE_CHAIN (parm);
6642 if (DECL_NAME (parm) == 0)
6644 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6646 else if (TREE_CODE (parm) != PARM_DECL)
6650 storetags (chainon (parmtags, gettags ()));
6654 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6655 each with a parm name as the TREE_VALUE.
6657 PARMDECLS is a chain of declarations for parameters.
6658 Warning! It can also contain CONST_DECLs which are not parameters
6659 but are names of enumerators of any enum types
6660 declared among the parameters.
6662 First match each formal parameter name with its declaration.
6663 Associate decls with the names and store the decls
6664 into the TREE_PURPOSE slots. */
6666 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6667 DECL_RESULT (parm) = 0;
6669 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6671 register tree tail, found = NULL;
6673 if (TREE_VALUE (parm) == 0)
6675 error_with_decl (fndecl, "parameter name missing from parameter list");
6676 TREE_PURPOSE (parm) = 0;
6680 /* See if any of the parmdecls specifies this parm by name.
6681 Ignore any enumerator decls. */
6682 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6683 if (DECL_NAME (tail) == TREE_VALUE (parm)
6684 && TREE_CODE (tail) == PARM_DECL)
6690 /* If declaration already marked, we have a duplicate name.
6691 Complain, and don't use this decl twice. */
6692 if (found && DECL_RESULT (found) != 0)
6694 error_with_decl (found, "multiple parameters named `%s'");
6698 /* If the declaration says "void", complain and ignore it. */
6699 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6701 error_with_decl (found, "parameter `%s' declared void");
6702 TREE_TYPE (found) = integer_type_node;
6703 DECL_ARG_TYPE (found) = integer_type_node;
6704 layout_decl (found, 0);
6707 /* Traditionally, a parm declared float is actually a double. */
6708 if (found && flag_traditional
6709 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6711 TREE_TYPE (found) = double_type_node;
6712 DECL_ARG_TYPE (found) = double_type_node;
6713 layout_decl (found, 0);
6716 /* If no declaration found, default to int. */
6719 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6721 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6722 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6723 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6725 warning_with_decl (found, "type of `%s' defaults to `int'");
6729 TREE_PURPOSE (parm) = found;
6731 /* Mark this decl as "already found" -- see test, above.
6732 It is safe to use DECL_RESULT for this
6733 since it is not used in PARM_DECLs or CONST_DECLs. */
6734 DECL_RESULT (found) = error_mark_node;
6737 /* Put anything which is on the parmdecls chain and which is
6738 not a PARM_DECL onto the list NONPARMS. (The types of
6739 non-parm things which might appear on the list include
6740 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6741 any actual PARM_DECLs not matched with any names. */
6744 for (parm = parmdecls; parm; )
6746 tree next = TREE_CHAIN (parm);
6747 TREE_CHAIN (parm) = 0;
6749 if (TREE_CODE (parm) != PARM_DECL)
6750 nonparms = chainon (nonparms, parm);
6753 /* Complain about args with incomplete types. */
6754 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6756 error_with_decl (parm, "parameter `%s' has incomplete type");
6757 TREE_TYPE (parm) = error_mark_node;
6760 if (DECL_RESULT (parm) == 0)
6762 error_with_decl (parm,
6763 "declaration for parameter `%s' but no such parameter");
6764 /* Pretend the parameter was not missing.
6765 This gets us to a standard state and minimizes
6766 further error messages. */
6768 = chainon (specparms,
6769 tree_cons (parm, NULL_TREE, NULL_TREE));
6776 /* Chain the declarations together in the order of the list of names. */
6777 /* Store that chain in the function decl, replacing the list of names. */
6779 DECL_ARGUMENTS (fndecl) = 0;
6782 for (last = 0; parm; parm = TREE_CHAIN (parm))
6783 if (TREE_PURPOSE (parm))
6786 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6788 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6789 last = TREE_PURPOSE (parm);
6790 TREE_CHAIN (last) = 0;
6794 /* If there was a previous prototype,
6795 set the DECL_ARG_TYPE of each argument according to
6796 the type previously specified, and report any mismatches. */
6798 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6801 for (parm = DECL_ARGUMENTS (fndecl),
6802 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6803 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6804 != void_type_node));
6805 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6807 if (parm == 0 || type == 0
6808 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6810 error ("number of arguments doesn't match prototype");
6811 error_with_file_and_line (current_function_prototype_file,
6812 current_function_prototype_line,
6813 "prototype declaration");
6816 /* Type for passing arg must be consistent
6817 with that declared for the arg. */
6818 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6820 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6821 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6823 /* Adjust argument to match prototype. E.g. a previous
6824 `int foo(float);' prototype causes
6825 `int foo(x) float x; {...}' to be treated like
6826 `int foo(float x) {...}'. This is particularly
6827 useful for argument types like uid_t. */
6828 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6829 #ifdef PROMOTE_PROTOTYPES
6830 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6831 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6832 && TYPE_PRECISION (TREE_TYPE (parm))
6833 < TYPE_PRECISION (integer_type_node))
6834 DECL_ARG_TYPE (parm) = integer_type_node;
6838 pedwarn ("promoted argument `%s' doesn't match prototype",
6839 IDENTIFIER_POINTER (DECL_NAME (parm)));
6840 warning_with_file_and_line
6841 (current_function_prototype_file,
6842 current_function_prototype_line,
6843 "prototype declaration");
6846 /* If -traditional, allow `int' argument to match
6847 `unsigned' prototype. */
6848 else if (! (flag_traditional
6849 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6850 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6852 error ("argument `%s' doesn't match prototype",
6853 IDENTIFIER_POINTER (DECL_NAME (parm)));
6854 error_with_file_and_line (current_function_prototype_file,
6855 current_function_prototype_line,
6856 "prototype declaration");
6860 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6863 /* Otherwise, create a prototype that would match. */
6867 tree actual = 0, last = 0, type;
6869 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6871 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6874 TREE_CHAIN (last) = type;
6879 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6881 TREE_CHAIN (last) = type;
6885 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6886 of the type of this function, but we need to avoid having this
6887 affect the types of other similarly-typed functions, so we must
6888 first force the generation of an identical (but separate) type
6889 node for the relevant function type. The new node we create
6890 will be a variant of the main variant of the original function
6893 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6895 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6898 /* Now store the final chain of decls for the arguments
6899 as the decl-chain of the current lexical scope.
6900 Put the enumerators in as well, at the front so that
6901 DECL_ARGUMENTS is not modified. */
6903 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6906 /* Make sure the binding level for the top of the function body
6907 gets a BLOCK if there are any in the function.
6908 Otherwise, the dbx output is wrong. */
6910 keep_next_if_subblocks = 1;
6912 /* ??? This might be an improvement,
6913 but needs to be thought about some more. */
6915 keep_next_level_flag = 1;
6918 /* Write a record describing this function definition to the prototypes
6919 file (if requested). */
6921 gen_aux_info_record (fndecl, 1, 0, prototype);
6923 /* Initialize the RTL code for the function. */
6925 init_function_start (fndecl, input_filename, lineno);
6927 /* If this is a varargs function, inform function.c. */
6929 if (c_function_varargs)
6932 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6934 declare_function_name ();
6936 /* Set up parameters and prepare for return, for the function. */
6938 expand_function_start (fndecl, 0);
6940 /* If this function is `main', emit a call to `__main'
6941 to run global initializers, etc. */
6942 if (DECL_NAME (fndecl)
6943 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6944 && DECL_CONTEXT (fndecl) == NULL_TREE)
6945 expand_main_function ();
6948 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6949 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6950 stands for an ellipsis in the identifier list.
6952 PARMLIST is the data returned by get_parm_info for the
6953 parmlist that follows the semicolon.
6955 We return a value of the same sort that get_parm_info returns,
6956 except that it describes the combination of identifiers and parmlist. */
6959 combine_parm_decls (specparms, parmlist, void_at_end)
6960 tree specparms, parmlist;
6963 register tree fndecl = current_function_decl;
6966 tree parmdecls = TREE_PURPOSE (parmlist);
6968 /* This is a chain of any other decls that came in among the parm
6969 declarations. They were separated already by get_parm_info,
6970 so we just need to keep them separate. */
6971 tree nonparms = TREE_VALUE (parmlist);
6975 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6976 DECL_RESULT (parm) = 0;
6978 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6980 register tree tail, found = NULL;
6982 /* See if any of the parmdecls specifies this parm by name. */
6983 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6984 if (DECL_NAME (tail) == TREE_VALUE (parm))
6990 /* If declaration already marked, we have a duplicate name.
6991 Complain, and don't use this decl twice. */
6992 if (found && DECL_RESULT (found) != 0)
6994 error_with_decl (found, "multiple parameters named `%s'");
6998 /* If the declaration says "void", complain and ignore it. */
6999 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7001 error_with_decl (found, "parameter `%s' declared void");
7002 TREE_TYPE (found) = integer_type_node;
7003 DECL_ARG_TYPE (found) = integer_type_node;
7004 layout_decl (found, 0);
7007 /* Traditionally, a parm declared float is actually a double. */
7008 if (found && flag_traditional
7009 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7011 TREE_TYPE (found) = double_type_node;
7012 DECL_ARG_TYPE (found) = double_type_node;
7013 layout_decl (found, 0);
7016 /* If no declaration found, default to int. */
7019 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7021 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7022 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7023 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7024 error_with_decl (found, "type of parameter `%s' is not declared");
7028 TREE_PURPOSE (parm) = found;
7030 /* Mark this decl as "already found" -- see test, above.
7031 It is safe to use DECL_RESULT for this
7032 since it is not used in PARM_DECLs or CONST_DECLs. */
7033 DECL_RESULT (found) = error_mark_node;
7036 /* Complain about any actual PARM_DECLs not matched with any names. */
7038 for (parm = parmdecls; parm; )
7040 tree next = TREE_CHAIN (parm);
7041 TREE_CHAIN (parm) = 0;
7043 /* Complain about args with incomplete types. */
7044 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7046 error_with_decl (parm, "parameter `%s' has incomplete type");
7047 TREE_TYPE (parm) = error_mark_node;
7050 if (DECL_RESULT (parm) == 0)
7052 error_with_decl (parm,
7053 "declaration for parameter `%s' but no such parameter");
7054 /* Pretend the parameter was not missing.
7055 This gets us to a standard state and minimizes
7056 further error messages. */
7058 = chainon (specparms,
7059 tree_cons (parm, NULL_TREE, NULL_TREE));
7065 /* Chain the declarations together in the order of the list of names.
7066 At the same time, build up a list of their types, in reverse order. */
7072 for (last = 0; parm; parm = TREE_CHAIN (parm))
7073 if (TREE_PURPOSE (parm))
7076 parmdecls = TREE_PURPOSE (parm);
7078 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7079 last = TREE_PURPOSE (parm);
7080 TREE_CHAIN (last) = 0;
7082 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7087 return saveable_tree_cons (parmdecls, nonparms,
7088 nreverse (saveable_tree_cons (NULL_TREE,
7092 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7095 /* Finish up a function declaration and compile that function
7096 all the way to assembler language output. The free the storage
7097 for the function definition.
7099 This is called after parsing the body of the function definition.
7101 NESTED is nonzero if the function being finished is nested in another. */
7104 finish_function (nested)
7107 register tree fndecl = current_function_decl;
7109 /* TREE_READONLY (fndecl) = 1;
7110 This caused &foo to be of type ptr-to-const-function
7111 which then got a warning when stored in a ptr-to-function variable. */
7114 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7116 /* Must mark the RESULT_DECL as being in this function. */
7118 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7120 /* Obey `register' declarations if `setjmp' is called in this fn. */
7121 if (flag_traditional && current_function_calls_setjmp)
7123 setjmp_protect (DECL_INITIAL (fndecl));
7124 setjmp_protect_args ();
7127 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7129 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7130 != integer_type_node)
7132 /* You would expect the sense of this test to be the other way
7133 around, but if warn_main is set, we will already have warned,
7134 so this would be a duplicate. This is the warning you get
7135 in some environments even if you *don't* ask for it, because
7136 these are environments where it may be more of a problem than
7139 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7143 #ifdef DEFAULT_MAIN_RETURN
7144 /* Make it so that `main' always returns success by default. */
7145 DEFAULT_MAIN_RETURN;
7150 /* Generate rtl for function exit. */
7151 expand_function_end (input_filename, lineno, 0);
7153 /* So we can tell if jump_optimize sets it to 1. */
7156 /* Run the optimizers and output the assembler code for this function. */
7157 rest_of_compilation (fndecl);
7159 current_function_returns_null |= can_reach_end;
7161 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7162 warning ("`noreturn' function does return");
7163 else if (warn_return_type && can_reach_end
7164 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7165 /* If this function returns non-void and control can drop through,
7167 warning ("control reaches end of non-void function");
7168 /* With just -W, complain only if function returns both with
7169 and without a value. */
7170 else if (extra_warnings
7171 && current_function_returns_value && current_function_returns_null)
7172 warning ("this function may return with or without a value");
7174 /* If requested, warn about function definitions where the function will
7175 return a value (usually of some struct or union type) which itself will
7176 take up a lot of stack space. */
7178 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7180 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7184 register tree ret_type_size = TYPE_SIZE (ret_type);
7186 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7189 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7191 if (units > larger_than_size)
7192 warning_with_decl (fndecl,
7193 "size of return value of `%s' is %u bytes",
7199 /* Free all the tree nodes making up this function. */
7200 /* Switch back to allocating nodes permanently
7201 until we start another function. */
7203 permanent_allocation (1);
7205 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7207 /* Stop pointing to the local nodes about to be freed. */
7208 /* But DECL_INITIAL must remain nonzero so we know this
7209 was an actual function definition. */
7210 /* For a nested function, this is done in pop_c_function_context. */
7211 /* If rest_of_compilation set this to 0, leave it 0. */
7212 if (DECL_INITIAL (fndecl) != 0)
7213 DECL_INITIAL (fndecl) = error_mark_node;
7214 DECL_ARGUMENTS (fndecl) = 0;
7217 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7219 #ifndef ASM_OUTPUT_CONSTRUCTOR
7220 if (! flag_gnu_linker)
7221 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7224 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7226 if (DECL_STATIC_DESTRUCTOR (fndecl))
7228 #ifndef ASM_OUTPUT_DESTRUCTOR
7229 if (! flag_gnu_linker)
7230 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7233 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7238 /* Let the error reporting routines know that we're outside a
7239 function. For a nested function, this value is used in
7240 pop_c_function_context and then reset via pop_function_context. */
7241 current_function_decl = NULL;
7245 /* Save and restore the variables in this file and elsewhere
7246 that keep track of the progress of compilation of the current function.
7247 Used for nested functions. */
7251 struct c_function *next;
7253 tree shadowed_labels;
7256 int warn_about_return_type;
7258 struct binding_level *binding_level;
7261 struct c_function *c_function_chain;
7263 /* Save and reinitialize the variables
7264 used during compilation of a C function. */
7267 push_c_function_context ()
7269 struct c_function *p
7270 = (struct c_function *) xmalloc (sizeof (struct c_function));
7273 pedwarn ("ANSI C forbids nested functions");
7275 push_function_context ();
7277 p->next = c_function_chain;
7278 c_function_chain = p;
7280 p->named_labels = named_labels;
7281 p->shadowed_labels = shadowed_labels;
7282 p->returns_value = current_function_returns_value;
7283 p->returns_null = current_function_returns_null;
7284 p->warn_about_return_type = warn_about_return_type;
7285 p->extern_inline = current_extern_inline;
7286 p->binding_level = current_binding_level;
7289 /* Restore the variables used during compilation of a C function. */
7292 pop_c_function_context ()
7294 struct c_function *p = c_function_chain;
7297 /* Bring back all the labels that were shadowed. */
7298 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7299 if (DECL_NAME (TREE_VALUE (link)) != 0)
7300 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7301 = TREE_VALUE (link);
7303 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7305 /* Stop pointing to the local nodes about to be freed. */
7306 /* But DECL_INITIAL must remain nonzero so we know this
7307 was an actual function definition. */
7308 DECL_INITIAL (current_function_decl) = error_mark_node;
7309 DECL_ARGUMENTS (current_function_decl) = 0;
7312 pop_function_context ();
7314 c_function_chain = p->next;
7316 named_labels = p->named_labels;
7317 shadowed_labels = p->shadowed_labels;
7318 current_function_returns_value = p->returns_value;
7319 current_function_returns_null = p->returns_null;
7320 warn_about_return_type = p->warn_about_return_type;
7321 current_extern_inline = p->extern_inline;
7322 current_binding_level = p->binding_level;
7327 /* integrate_decl_tree calls this function, but since we don't use the
7328 DECL_LANG_SPECIFIC field, this is a no-op. */
7331 copy_lang_decl (node)
7332 tree node ATTRIBUTE_UNUSED;