1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
40 extern cpp_reader parse_in;
41 extern cpp_options parse_options;
42 static int cpp_initialized;
45 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
47 { NORMAL, /* Ordinary declaration */
48 FUNCDEF, /* Function definition */
49 PARM, /* Declaration of parm before function body */
50 FIELD, /* Declaration inside struct or union */
51 BITFIELD, /* Likewise but with specified width */
52 TYPENAME}; /* Typename (inside cast or sizeof) */
54 #ifndef CHAR_TYPE_SIZE
55 #define CHAR_TYPE_SIZE BITS_PER_UNIT
58 #ifndef SHORT_TYPE_SIZE
59 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
63 #define INT_TYPE_SIZE BITS_PER_WORD
66 #ifndef LONG_TYPE_SIZE
67 #define LONG_TYPE_SIZE BITS_PER_WORD
70 #ifndef LONG_LONG_TYPE_SIZE
71 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
74 #ifndef WCHAR_UNSIGNED
75 #define WCHAR_UNSIGNED 0
78 #ifndef FLOAT_TYPE_SIZE
79 #define FLOAT_TYPE_SIZE BITS_PER_WORD
82 #ifndef DOUBLE_TYPE_SIZE
83 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
86 #ifndef LONG_DOUBLE_TYPE_SIZE
87 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
90 /* We let tm.h override the types used here, to handle trivial differences
91 such as the choice of unsigned int or long unsigned int for size_t.
92 When machines start needing nontrivial differences in the size type,
93 it would be best to do something here to figure out automatically
94 from other information what type to use. */
97 #define SIZE_TYPE "long unsigned int"
101 #define PTRDIFF_TYPE "long int"
105 #define WCHAR_TYPE "int"
108 /* a node which has tree code ERROR_MARK, and whose type is itself.
109 All erroneous expressions are replaced with this node. All functions
110 that accept nodes as arguments should avoid generating error messages
111 if this node is one of the arguments, since it is undesirable to get
112 multiple error messages from one error in the input. */
114 tree error_mark_node;
116 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
118 tree short_integer_type_node;
119 tree integer_type_node;
120 tree long_integer_type_node;
121 tree long_long_integer_type_node;
123 tree short_unsigned_type_node;
124 tree unsigned_type_node;
125 tree long_unsigned_type_node;
126 tree long_long_unsigned_type_node;
128 tree boolean_type_node;
129 tree boolean_false_node;
130 tree boolean_true_node;
132 tree ptrdiff_type_node;
134 tree unsigned_char_type_node;
135 tree signed_char_type_node;
137 tree wchar_type_node;
138 tree signed_wchar_type_node;
139 tree unsigned_wchar_type_node;
141 tree float_type_node;
142 tree double_type_node;
143 tree long_double_type_node;
145 tree complex_integer_type_node;
146 tree complex_float_type_node;
147 tree complex_double_type_node;
148 tree complex_long_double_type_node;
150 tree intQI_type_node;
151 tree intHI_type_node;
152 tree intSI_type_node;
153 tree intDI_type_node;
154 tree intTI_type_node;
156 tree unsigned_intQI_type_node;
157 tree unsigned_intHI_type_node;
158 tree unsigned_intSI_type_node;
159 tree unsigned_intDI_type_node;
160 tree unsigned_intTI_type_node;
162 /* a VOID_TYPE node. */
166 /* Nodes for types `void *' and `const void *'. */
168 tree ptr_type_node, const_ptr_type_node;
170 /* Nodes for types `char *' and `const char *'. */
172 tree string_type_node, const_string_type_node;
174 /* Type `char[SOMENUMBER]'.
175 Used when an array of char is needed and the size is irrelevant. */
177 tree char_array_type_node;
179 /* Type `int[SOMENUMBER]' or something like it.
180 Used when an array of int needed and the size is irrelevant. */
182 tree int_array_type_node;
184 /* Type `wchar_t[SOMENUMBER]' or something like it.
185 Used when a wide string literal is created. */
187 tree wchar_array_type_node;
189 /* type `int ()' -- used for implicit declaration of functions. */
191 tree default_function_type;
193 /* function types `double (double)' and `double (double, double)', etc. */
195 tree double_ftype_double, double_ftype_double_double;
196 tree int_ftype_int, long_ftype_long;
197 tree float_ftype_float;
198 tree ldouble_ftype_ldouble;
200 /* Function type `void (void *, void *, int)' and similar ones */
202 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
204 /* Function type `char *(char *, char *)' and similar ones */
205 tree string_ftype_ptr_ptr, int_ftype_string_string;
207 /* Function type `int (const void *, const void *, size_t)' */
208 tree int_ftype_cptr_cptr_sizet;
210 /* Two expressions that are constants with value zero.
211 The first is of type `int', the second of type `void *'. */
213 tree integer_zero_node;
214 tree null_pointer_node;
216 /* A node for the integer constant 1. */
218 tree integer_one_node;
220 /* Nonzero if we have seen an invalid cross reference
221 to a struct, union, or enum, but not yet printed the message. */
223 tree pending_invalid_xref;
224 /* File and line to appear in the eventual error message. */
225 char *pending_invalid_xref_file;
226 int pending_invalid_xref_line;
228 /* While defining an enum type, this is 1 plus the last enumerator
229 constant value. Note that will do not have to save this or `enum_overflow'
230 around nested function definition since such a definition could only
231 occur in an enum value expression and we don't use these variables in
234 static tree enum_next_value;
236 /* Nonzero means that there was overflow computing enum_next_value. */
238 static int enum_overflow;
240 /* Parsing a function declarator leaves a list of parameter names
241 or a chain or parameter decls here. */
243 static tree last_function_parms;
245 /* Parsing a function declarator leaves here a chain of structure
246 and enum types declared in the parmlist. */
248 static tree last_function_parm_tags;
250 /* After parsing the declarator that starts a function definition,
251 `start_function' puts here the list of parameter names or chain of decls.
252 `store_parm_decls' finds it here. */
254 static tree current_function_parms;
256 /* Similar, for last_function_parm_tags. */
257 static tree current_function_parm_tags;
259 /* Similar, for the file and line that the prototype came from if this is
260 an old-style definition. */
261 static char *current_function_prototype_file;
262 static int current_function_prototype_line;
264 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
265 that have names. Here so we can clear out their names' definitions
266 at the end of the function. */
268 static tree named_labels;
270 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
272 static tree shadowed_labels;
274 /* Nonzero when store_parm_decls is called indicates a varargs function.
275 Value not meaningful after store_parm_decls. */
277 static int c_function_varargs;
279 /* The FUNCTION_DECL for the function currently being compiled,
280 or 0 if between functions. */
281 tree current_function_decl;
283 /* Set to 0 at beginning of a function definition, set to 1 if
284 a return statement that specifies a return value is seen. */
286 int current_function_returns_value;
288 /* Set to 0 at beginning of a function definition, set to 1 if
289 a return statement with no argument is seen. */
291 int current_function_returns_null;
293 /* Set to nonzero by `grokdeclarator' for a function
294 whose return type is defaulted, if warnings for this are desired. */
296 static int warn_about_return_type;
298 /* Nonzero when starting a function declared `extern inline'. */
300 static int current_extern_inline;
302 /* For each binding contour we allocate a binding_level structure
303 * which records the names defined in that contour.
306 * 1) one for each function definition,
307 * where internal declarations of the parameters appear.
308 * 2) one for each compound statement,
309 * to record its declarations.
311 * The current meaning of a name can be found by searching the levels from
312 * the current one out to the global one.
315 /* Note that the information in the `names' component of the global contour
316 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
320 /* A chain of _DECL nodes for all variables, constants, functions,
321 and typedef types. These are in the reverse of the order supplied.
325 /* A list of structure, union and enum definitions,
326 * for looking up tag names.
327 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
328 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
329 * or ENUMERAL_TYPE node.
333 /* For each level, a list of shadowed outer-level local definitions
334 to be restored when this level is popped.
335 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
336 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
339 /* For each level (except not the global one),
340 a chain of BLOCK nodes for all the levels
341 that were entered and exited one level down. */
344 /* The BLOCK node for this level, if one has been preallocated.
345 If 0, the BLOCK is allocated (if needed) when the level is popped. */
348 /* The binding level which this one is contained in (inherits from). */
349 struct binding_level *level_chain;
351 /* Nonzero for the level that holds the parameters of a function. */
354 /* Nonzero if this level "doesn't exist" for tags. */
355 char tag_transparent;
357 /* Nonzero if sublevels of this level "don't exist" for tags.
358 This is set in the parm level of a function definition
359 while reading the function body, so that the outermost block
360 of the function body will be tag-transparent. */
361 char subblocks_tag_transparent;
363 /* Nonzero means make a BLOCK for this level regardless of all else. */
366 /* Nonzero means make a BLOCK if this level has any subblocks. */
367 char keep_if_subblocks;
369 /* Number of decls in `names' that have incomplete
370 structure or union types. */
373 /* A list of decls giving the (reversed) specified order of parms,
374 not including any forward-decls in the parmlist.
375 This is so we can put the parms in proper order for assign_parms. */
379 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
381 /* The binding level currently in effect. */
383 static struct binding_level *current_binding_level;
385 /* A chain of binding_level structures awaiting reuse. */
387 static struct binding_level *free_binding_level;
389 /* The outermost binding level, for names of file scope.
390 This is created when the compiler is started and exists
391 through the entire run. */
393 static struct binding_level *global_binding_level;
395 /* Binding level structures are initialized by copying this one. */
397 static struct binding_level clear_binding_level
398 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
401 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
403 static int keep_next_level_flag;
405 /* Nonzero means make a BLOCK for the next level pushed
406 if it has subblocks. */
408 static int keep_next_if_subblocks;
410 /* The chain of outer levels of label scopes.
411 This uses the same data structure used for binding levels,
412 but it works differently: each link in the chain records
413 saved values of named_labels and shadowed_labels for
414 a label binding level outside the current one. */
416 static struct binding_level *label_level_chain;
418 /* Functions called automatically at the beginning and end of execution. */
420 tree static_ctors, static_dtors;
422 /* Forward declarations. */
424 static struct binding_level * make_binding_level PROTO((void));
425 static void clear_limbo_values PROTO((tree));
426 static int duplicate_decls PROTO((tree, tree, int));
427 static char *redeclaration_error_message PROTO((tree, tree));
428 static void storedecls PROTO((tree));
429 static void storetags PROTO((tree));
430 static tree lookup_tag PROTO((enum tree_code, tree,
431 struct binding_level *, int));
432 static tree lookup_tag_reverse PROTO((tree));
433 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
435 static tree grokparms PROTO((tree, int));
436 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
437 static void layout_array_type PROTO((tree));
439 /* C-specific option variables. */
441 /* Nonzero means allow type mismatches in conditional expressions;
442 just make their values `void'. */
444 int flag_cond_mismatch;
446 /* Nonzero means give `double' the same size as `float'. */
448 int flag_short_double;
450 /* Nonzero means don't recognize the keyword `asm'. */
454 /* Nonzero means don't recognize any builtin functions. */
458 /* Nonzero means don't recognize the non-ANSI builtin functions.
461 int flag_no_nonansi_builtin;
463 /* Nonzero means do some things the same way PCC does. */
465 int flag_traditional;
467 /* Nonzero means that we have builtin functions, and main is an int */
471 /* Nonzero means to allow single precision math even if we're generally
472 being traditional. */
473 int flag_allow_single_precision = 0;
475 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
477 int flag_signed_bitfields = 1;
478 int explicit_flag_signed_bitfields = 0;
480 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
482 int flag_no_ident = 0;
484 /* Nonzero means warn about use of implicit int. */
486 int warn_implicit_int;
488 /* Nonzero means warn about usage of long long when `-pedantic'. */
490 int warn_long_long = 1;
492 /* Nonzero means message about use of implicit function declarations;
493 1 means warning; 2 means error. */
495 int mesg_implicit_function_declaration;
497 /* Nonzero means give string constants the type `const char *'
498 to get extra warnings from them. These warnings will be too numerous
499 to be useful, except in thoroughly ANSIfied programs. */
501 int warn_write_strings;
503 /* Nonzero means warn about pointer casts that can drop a type qualifier
504 from the pointer target type. */
508 /* Nonzero means warn when casting a function call to a type that does
509 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
510 when there is no previous declaration of sqrt or malloc. */
512 int warn_bad_function_cast;
514 /* Warn about traditional constructs whose meanings changed in ANSI C. */
516 int warn_traditional;
518 /* Nonzero means warn about sizeof(function) or addition/subtraction
519 of function pointers. */
521 int warn_pointer_arith;
523 /* Nonzero means warn for non-prototype function decls
524 or non-prototyped defs without previous prototype. */
526 int warn_strict_prototypes;
528 /* Nonzero means warn for any global function def
529 without separate previous prototype decl. */
531 int warn_missing_prototypes;
533 /* Nonzero means warn for any global function def
534 without separate previous decl. */
536 int warn_missing_declarations;
538 /* Nonzero means warn about multiple (redundant) decls for the same single
539 variable or function. */
541 int warn_redundant_decls = 0;
543 /* Nonzero means warn about extern declarations of objects not at
544 file-scope level and about *all* declarations of functions (whether
545 extern or static) not at file-scope level. Note that we exclude
546 implicit function declarations. To get warnings about those, use
549 int warn_nested_externs = 0;
551 /* Warn about *printf or *scanf format/argument anomalies. */
555 /* Warn about a subscript that has type char. */
557 int warn_char_subscripts = 0;
559 /* Warn if a type conversion is done that might have confusing results. */
563 /* Warn if adding () is suggested. */
565 int warn_parentheses;
567 /* Warn if initializer is not completely bracketed. */
569 int warn_missing_braces;
571 /* Warn if main is suspicious. */
575 /* Warn about #pragma directives that are not recognised. */
577 int warn_unknown_pragmas = 0; /* Tri state variable. */
579 /* Warn about comparison of signed and unsigned values.
580 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
582 int warn_sign_compare = -1;
584 /* Nonzero means warn about use of multicharacter literals. */
586 int warn_multichar = 1;
588 /* Nonzero means `$' can be in an identifier. */
590 #ifndef DOLLARS_IN_IDENTIFIERS
591 #define DOLLARS_IN_IDENTIFIERS 1
593 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
595 /* Decode the string P as a language-specific option for C.
596 Return the number of strings consumed. */
599 c_decode_option (argc, argv)
603 int strings_processed;
606 if (! cpp_initialized)
608 cpp_reader_init (&parse_in);
609 parse_in.data = &parse_options;
610 cpp_options_init (&parse_options);
613 strings_processed = cpp_handle_option (&parse_in, argc, argv);
615 strings_processed = 0;
616 #endif /* ! USE_CPPLIB */
618 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
620 flag_traditional = 1;
621 flag_writable_strings = 1;
623 else if (!strcmp (p, "-fallow-single-precision"))
624 flag_allow_single_precision = 1;
625 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
630 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
634 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
638 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
640 flag_traditional = 0;
641 flag_writable_strings = 0;
643 else if (!strcmp (p, "-fdollars-in-identifiers"))
644 dollars_in_ident = 1;
645 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
646 dollars_in_ident = 0;
647 else if (!strcmp (p, "-fsigned-char"))
648 flag_signed_char = 1;
649 else if (!strcmp (p, "-funsigned-char"))
650 flag_signed_char = 0;
651 else if (!strcmp (p, "-fno-signed-char"))
652 flag_signed_char = 0;
653 else if (!strcmp (p, "-fno-unsigned-char"))
654 flag_signed_char = 1;
655 else if (!strcmp (p, "-fsigned-bitfields")
656 || !strcmp (p, "-fno-unsigned-bitfields"))
658 flag_signed_bitfields = 1;
659 explicit_flag_signed_bitfields = 1;
661 else if (!strcmp (p, "-funsigned-bitfields")
662 || !strcmp (p, "-fno-signed-bitfields"))
664 flag_signed_bitfields = 0;
665 explicit_flag_signed_bitfields = 1;
667 else if (!strcmp (p, "-fshort-enums"))
668 flag_short_enums = 1;
669 else if (!strcmp (p, "-fno-short-enums"))
670 flag_short_enums = 0;
671 else if (!strcmp (p, "-fcond-mismatch"))
672 flag_cond_mismatch = 1;
673 else if (!strcmp (p, "-fno-cond-mismatch"))
674 flag_cond_mismatch = 0;
675 else if (!strcmp (p, "-fshort-double"))
676 flag_short_double = 1;
677 else if (!strcmp (p, "-fno-short-double"))
678 flag_short_double = 0;
679 else if (!strcmp (p, "-fasm"))
681 else if (!strcmp (p, "-fno-asm"))
683 else if (!strcmp (p, "-fbuiltin"))
685 else if (!strcmp (p, "-fno-builtin"))
687 else if (!strcmp (p, "-fno-ident"))
689 else if (!strcmp (p, "-fident"))
691 else if (!strcmp (p, "-ansi"))
692 flag_no_asm = 1, flag_no_nonansi_builtin = 1;
693 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
694 mesg_implicit_function_declaration = 2;
695 else if (!strcmp (p, "-Wimplicit-function-declaration"))
696 mesg_implicit_function_declaration = 1;
697 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
698 mesg_implicit_function_declaration = 0;
699 else if (!strcmp (p, "-Wimplicit-int"))
700 warn_implicit_int = 1;
701 else if (!strcmp (p, "-Wno-implicit-int"))
702 warn_implicit_int = 0;
703 else if (!strcmp (p, "-Wimplicit"))
705 warn_implicit_int = 1;
706 if (mesg_implicit_function_declaration != 2)
707 mesg_implicit_function_declaration = 1;
709 else if (!strcmp (p, "-Wno-implicit"))
710 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
711 else if (!strcmp (p, "-Wlong-long"))
713 else if (!strcmp (p, "-Wno-long-long"))
715 else if (!strcmp (p, "-Wwrite-strings"))
716 warn_write_strings = 1;
717 else if (!strcmp (p, "-Wno-write-strings"))
718 warn_write_strings = 0;
719 else if (!strcmp (p, "-Wcast-qual"))
721 else if (!strcmp (p, "-Wno-cast-qual"))
723 else if (!strcmp (p, "-Wbad-function-cast"))
724 warn_bad_function_cast = 1;
725 else if (!strcmp (p, "-Wno-bad-function-cast"))
726 warn_bad_function_cast = 0;
727 else if (!strcmp (p, "-Wpointer-arith"))
728 warn_pointer_arith = 1;
729 else if (!strcmp (p, "-Wno-pointer-arith"))
730 warn_pointer_arith = 0;
731 else if (!strcmp (p, "-Wstrict-prototypes"))
732 warn_strict_prototypes = 1;
733 else if (!strcmp (p, "-Wno-strict-prototypes"))
734 warn_strict_prototypes = 0;
735 else if (!strcmp (p, "-Wmissing-prototypes"))
736 warn_missing_prototypes = 1;
737 else if (!strcmp (p, "-Wno-missing-prototypes"))
738 warn_missing_prototypes = 0;
739 else if (!strcmp (p, "-Wmissing-declarations"))
740 warn_missing_declarations = 1;
741 else if (!strcmp (p, "-Wno-missing-declarations"))
742 warn_missing_declarations = 0;
743 else if (!strcmp (p, "-Wredundant-decls"))
744 warn_redundant_decls = 1;
745 else if (!strcmp (p, "-Wno-redundant-decls"))
746 warn_redundant_decls = 0;
747 else if (!strcmp (p, "-Wnested-externs"))
748 warn_nested_externs = 1;
749 else if (!strcmp (p, "-Wno-nested-externs"))
750 warn_nested_externs = 0;
751 else if (!strcmp (p, "-Wtraditional"))
752 warn_traditional = 1;
753 else if (!strcmp (p, "-Wno-traditional"))
754 warn_traditional = 0;
755 else if (!strcmp (p, "-Wformat"))
757 else if (!strcmp (p, "-Wno-format"))
759 else if (!strcmp (p, "-Wchar-subscripts"))
760 warn_char_subscripts = 1;
761 else if (!strcmp (p, "-Wno-char-subscripts"))
762 warn_char_subscripts = 0;
763 else if (!strcmp (p, "-Wconversion"))
765 else if (!strcmp (p, "-Wno-conversion"))
767 else if (!strcmp (p, "-Wparentheses"))
768 warn_parentheses = 1;
769 else if (!strcmp (p, "-Wno-parentheses"))
770 warn_parentheses = 0;
771 else if (!strcmp (p, "-Wreturn-type"))
772 warn_return_type = 1;
773 else if (!strcmp (p, "-Wno-return-type"))
774 warn_return_type = 0;
775 else if (!strcmp (p, "-Wcomment"))
776 ; /* cpp handles this one. */
777 else if (!strcmp (p, "-Wno-comment"))
778 ; /* cpp handles this one. */
779 else if (!strcmp (p, "-Wcomments"))
780 ; /* cpp handles this one. */
781 else if (!strcmp (p, "-Wno-comments"))
782 ; /* cpp handles this one. */
783 else if (!strcmp (p, "-Wtrigraphs"))
784 ; /* cpp handles this one. */
785 else if (!strcmp (p, "-Wno-trigraphs"))
786 ; /* cpp handles this one. */
787 else if (!strcmp (p, "-Wundef"))
788 ; /* cpp handles this one. */
789 else if (!strcmp (p, "-Wno-undef"))
790 ; /* cpp handles this one. */
791 else if (!strcmp (p, "-Wimport"))
792 ; /* cpp handles this one. */
793 else if (!strcmp (p, "-Wno-import"))
794 ; /* cpp handles this one. */
795 else if (!strcmp (p, "-Wmissing-braces"))
796 warn_missing_braces = 1;
797 else if (!strcmp (p, "-Wno-missing-braces"))
798 warn_missing_braces = 0;
799 else if (!strcmp (p, "-Wmain"))
801 else if (!strcmp (p, "-Wno-main"))
803 else if (!strcmp (p, "-Wsign-compare"))
804 warn_sign_compare = 1;
805 else if (!strcmp (p, "-Wno-sign-compare"))
806 warn_sign_compare = 0;
807 else if (!strcmp (p, "-Wmultichar"))
809 else if (!strcmp (p, "-Wno-multichar"))
811 else if (!strcmp (p, "-Wunknown-pragmas"))
812 /* Set to greater than 1, so that even unknown pragmas in system
813 headers will be warned about. */
814 warn_unknown_pragmas = 2;
815 else if (!strcmp (p, "-Wno-unknown-pragmas"))
816 warn_unknown_pragmas = 0;
817 else if (!strcmp (p, "-Wall"))
819 /* We save the value of warn_uninitialized, since if they put
820 -Wuninitialized on the command line, we need to generate a
821 warning about not using it without also specifying -O. */
822 if (warn_uninitialized != 1)
823 warn_uninitialized = 2;
824 warn_implicit_int = 1;
825 mesg_implicit_function_declaration = 1;
826 warn_return_type = 1;
830 warn_char_subscripts = 1;
831 warn_parentheses = 1;
832 warn_missing_braces = 1;
833 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
834 it off only if it's not explicit. */
836 /* Only warn about unknown pragmas that are not in system headers. */
837 warn_unknown_pragmas = 1;
840 return strings_processed;
845 /* Hooks for print_node. */
848 print_lang_decl (file, node, indent)
849 FILE *file ATTRIBUTE_UNUSED;
850 tree node ATTRIBUTE_UNUSED;
851 int indent ATTRIBUTE_UNUSED;
856 print_lang_type (file, node, indent)
857 FILE *file ATTRIBUTE_UNUSED;
858 tree node ATTRIBUTE_UNUSED;
859 int indent ATTRIBUTE_UNUSED;
864 print_lang_identifier (file, node, indent)
869 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
870 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
871 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
872 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
873 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
874 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
877 /* Hook called at end of compilation to assume 1 elt
878 for a top-level array decl that wasn't complete before. */
881 finish_incomplete_decl (decl)
884 if (TREE_CODE (decl) == VAR_DECL)
886 tree type = TREE_TYPE (decl);
887 if (type != error_mark_node
888 && TREE_CODE (type) == ARRAY_TYPE
889 && TYPE_DOMAIN (type) == 0)
891 if (! DECL_EXTERNAL (decl))
892 warning_with_decl (decl, "array `%s' assumed to have one element");
894 complete_array_type (type, NULL_TREE, 1);
896 layout_decl (decl, 0);
901 /* Create a new `struct binding_level'. */
904 struct binding_level *
905 make_binding_level ()
908 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
911 /* Nonzero if we are currently in the global binding level. */
916 return current_binding_level == global_binding_level;
922 keep_next_level_flag = 1;
925 /* Nonzero if the current level needs to have a BLOCK made. */
930 return ((current_binding_level->keep_if_subblocks
931 && current_binding_level->blocks != 0)
932 || current_binding_level->keep
933 || current_binding_level->names != 0
934 || (current_binding_level->tags != 0
935 && !current_binding_level->tag_transparent));
938 /* Identify this binding level as a level of parameters.
939 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
940 But it turns out there is no way to pass the right value for
941 DEFINITION_FLAG, so we ignore it. */
944 declare_parm_level (definition_flag)
947 current_binding_level->parm_flag = 1;
950 /* Nonzero if currently making parm declarations. */
955 return current_binding_level->parm_flag;
958 /* Enter a new binding level.
959 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
960 not for that of tags. */
963 pushlevel (tag_transparent)
966 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
968 /* If this is the top level of a function,
969 just make sure that NAMED_LABELS is 0. */
971 if (current_binding_level == global_binding_level)
976 /* Reuse or create a struct for this binding level. */
978 if (free_binding_level)
980 newlevel = free_binding_level;
981 free_binding_level = free_binding_level->level_chain;
985 newlevel = make_binding_level ();
988 /* Add this level to the front of the chain (stack) of levels that
991 *newlevel = clear_binding_level;
992 newlevel->tag_transparent
994 || (current_binding_level
995 ? current_binding_level->subblocks_tag_transparent
997 newlevel->level_chain = current_binding_level;
998 current_binding_level = newlevel;
999 newlevel->keep = keep_next_level_flag;
1000 keep_next_level_flag = 0;
1001 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1002 keep_next_if_subblocks = 0;
1005 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1008 clear_limbo_values (block)
1013 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1014 if (DECL_NAME (tem) != 0)
1015 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1017 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1018 clear_limbo_values (tem);
1021 /* Exit a binding level.
1022 Pop the level off, and restore the state of the identifier-decl mappings
1023 that were in effect when this level was entered.
1025 If KEEP is nonzero, this level had explicit declarations, so
1026 and create a "block" (a BLOCK node) for the level
1027 to record its declarations and subblocks for symbol table output.
1029 If FUNCTIONBODY is nonzero, this level is the body of a function,
1030 so create a block as if KEEP were set and also clear out all
1033 If REVERSE is nonzero, reverse the order of decls before putting
1034 them into the BLOCK. */
1037 poplevel (keep, reverse, functionbody)
1043 /* The chain of decls was accumulated in reverse order.
1044 Put it into forward order, just for cleanliness. */
1046 tree tags = current_binding_level->tags;
1047 tree subblocks = current_binding_level->blocks;
1050 int block_previously_created;
1052 keep |= current_binding_level->keep;
1054 /* This warning is turned off because it causes warnings for
1055 declarations like `extern struct foo *x'. */
1057 /* Warn about incomplete structure types in this level. */
1058 for (link = tags; link; link = TREE_CHAIN (link))
1059 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1061 tree type = TREE_VALUE (link);
1063 switch (TREE_CODE (type))
1066 errmsg = "`struct %s' incomplete in scope ending here";
1069 errmsg = "`union %s' incomplete in scope ending here";
1072 errmsg = "`enum %s' incomplete in scope ending here";
1075 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
1076 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
1078 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
1079 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
1083 /* Get the decls in the order they were written.
1084 Usually current_binding_level->names is in reverse order.
1085 But parameter decls were previously put in forward order. */
1088 current_binding_level->names
1089 = decls = nreverse (current_binding_level->names);
1091 decls = current_binding_level->names;
1093 /* Output any nested inline functions within this block
1094 if they weren't already output. */
1096 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1097 if (TREE_CODE (decl) == FUNCTION_DECL
1098 && ! TREE_ASM_WRITTEN (decl)
1099 && DECL_INITIAL (decl) != 0
1100 && TREE_ADDRESSABLE (decl))
1102 /* If this decl was copied from a file-scope decl
1103 on account of a block-scope extern decl,
1104 propagate TREE_ADDRESSABLE to the file-scope decl.
1106 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1107 true, since then the decl goes through save_for_inline_copying. */
1108 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1109 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1110 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1111 else if (DECL_SAVED_INSNS (decl) != 0)
1113 push_function_context ();
1114 output_inline_function (decl);
1115 pop_function_context ();
1119 /* If there were any declarations or structure tags in that level,
1120 or if this level is a function body,
1121 create a BLOCK to record them for the life of this function. */
1124 block_previously_created = (current_binding_level->this_block != 0);
1125 if (block_previously_created)
1126 block = current_binding_level->this_block;
1127 else if (keep || functionbody
1128 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1129 block = make_node (BLOCK);
1132 BLOCK_VARS (block) = decls;
1133 BLOCK_TYPE_TAGS (block) = tags;
1134 BLOCK_SUBBLOCKS (block) = subblocks;
1135 remember_end_note (block);
1138 /* In each subblock, record that this is its superior. */
1140 for (link = subblocks; link; link = TREE_CHAIN (link))
1141 BLOCK_SUPERCONTEXT (link) = block;
1143 /* Clear out the meanings of the local variables of this level. */
1145 for (link = decls; link; link = TREE_CHAIN (link))
1147 if (DECL_NAME (link) != 0)
1149 /* If the ident. was used or addressed via a local extern decl,
1150 don't forget that fact. */
1151 if (DECL_EXTERNAL (link))
1153 if (TREE_USED (link))
1154 TREE_USED (DECL_NAME (link)) = 1;
1155 if (TREE_ADDRESSABLE (link))
1156 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1158 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1162 /* Restore all name-meanings of the outer levels
1163 that were shadowed by this level. */
1165 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1166 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1168 /* If the level being exited is the top level of a function,
1169 check over all the labels, and clear out the current
1170 (function local) meanings of their names. */
1174 clear_limbo_values (block);
1176 /* If this is the top level block of a function,
1177 the vars are the function's parameters.
1178 Don't leave them in the BLOCK because they are
1179 found in the FUNCTION_DECL instead. */
1181 BLOCK_VARS (block) = 0;
1183 /* Clear out the definitions of all label names,
1184 since their scopes end here,
1185 and add them to BLOCK_VARS. */
1187 for (link = named_labels; link; link = TREE_CHAIN (link))
1189 register tree label = TREE_VALUE (link);
1191 if (DECL_INITIAL (label) == 0)
1193 error_with_decl (label, "label `%s' used but not defined");
1194 /* Avoid crashing later. */
1195 define_label (input_filename, lineno,
1198 else if (warn_unused && !TREE_USED (label))
1199 warning_with_decl (label, "label `%s' defined but not used");
1200 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1202 /* Put the labels into the "variables" of the
1203 top-level block, so debugger can see them. */
1204 TREE_CHAIN (label) = BLOCK_VARS (block);
1205 BLOCK_VARS (block) = label;
1209 /* Pop the current level, and free the structure for reuse. */
1212 register struct binding_level *level = current_binding_level;
1213 current_binding_level = current_binding_level->level_chain;
1215 level->level_chain = free_binding_level;
1216 free_binding_level = level;
1219 /* Dispose of the block that we just made inside some higher level. */
1221 DECL_INITIAL (current_function_decl) = block;
1224 if (!block_previously_created)
1225 current_binding_level->blocks
1226 = chainon (current_binding_level->blocks, block);
1228 /* If we did not make a block for the level just exited,
1229 any blocks made for inner levels
1230 (since they cannot be recorded as subblocks in that level)
1231 must be carried forward so they will later become subblocks
1232 of something else. */
1234 current_binding_level->blocks
1235 = chainon (current_binding_level->blocks, subblocks);
1237 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1238 binding contour so that they point to the appropriate construct, i.e.
1239 either to the current FUNCTION_DECL node, or else to the BLOCK node
1240 we just constructed.
1242 Note that for tagged types whose scope is just the formal parameter
1243 list for some function type specification, we can't properly set
1244 their TYPE_CONTEXTs here, because we don't have a pointer to the
1245 appropriate FUNCTION_TYPE node readily available to us. For those
1246 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1247 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1248 node which will represent the "scope" for these "parameter list local"
1253 for (link = tags; link; link = TREE_CHAIN (link))
1254 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1256 for (link = tags; link; link = TREE_CHAIN (link))
1257 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1260 TREE_USED (block) = 1;
1264 /* Delete the node BLOCK from the current binding level.
1265 This is used for the block inside a stmt expr ({...})
1266 so that the block can be reinserted where appropriate. */
1269 delete_block (block)
1273 if (current_binding_level->blocks == block)
1274 current_binding_level->blocks = TREE_CHAIN (block);
1275 for (t = current_binding_level->blocks; t;)
1277 if (TREE_CHAIN (t) == block)
1278 TREE_CHAIN (t) = TREE_CHAIN (block);
1282 TREE_CHAIN (block) = NULL;
1283 /* Clear TREE_USED which is always set by poplevel.
1284 The flag is set again if insert_block is called. */
1285 TREE_USED (block) = 0;
1288 /* Insert BLOCK at the end of the list of subblocks of the
1289 current binding level. This is used when a BIND_EXPR is expanded,
1290 to handle the BLOCK node inside the BIND_EXPR. */
1293 insert_block (block)
1296 TREE_USED (block) = 1;
1297 current_binding_level->blocks
1298 = chainon (current_binding_level->blocks, block);
1301 /* Set the BLOCK node for the innermost scope
1302 (the one we are currently in). */
1306 register tree block;
1308 current_binding_level->this_block = block;
1314 register struct binding_level *newlevel;
1316 /* Reuse or create a struct for this binding level. */
1318 if (free_binding_level)
1320 newlevel = free_binding_level;
1321 free_binding_level = free_binding_level->level_chain;
1325 newlevel = make_binding_level ();
1328 /* Add this level to the front of the chain (stack) of label levels. */
1330 newlevel->level_chain = label_level_chain;
1331 label_level_chain = newlevel;
1333 newlevel->names = named_labels;
1334 newlevel->shadowed = shadowed_labels;
1336 shadowed_labels = 0;
1342 register struct binding_level *level = label_level_chain;
1345 /* Clear out the definitions of the declared labels in this level.
1346 Leave in the list any ordinary, non-declared labels. */
1347 for (link = named_labels, prev = 0; link;)
1349 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1351 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1353 error_with_decl (TREE_VALUE (link),
1354 "label `%s' used but not defined");
1355 /* Avoid crashing later. */
1356 define_label (input_filename, lineno,
1357 DECL_NAME (TREE_VALUE (link)));
1359 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1360 warning_with_decl (TREE_VALUE (link),
1361 "label `%s' defined but not used");
1362 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1364 /* Delete this element from the list. */
1365 link = TREE_CHAIN (link);
1367 TREE_CHAIN (prev) = link;
1369 named_labels = link;
1374 link = TREE_CHAIN (link);
1378 /* Bring back all the labels that were shadowed. */
1379 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1380 if (DECL_NAME (TREE_VALUE (link)) != 0)
1381 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1382 = TREE_VALUE (link);
1384 named_labels = chainon (named_labels, level->names);
1385 shadowed_labels = level->shadowed;
1387 /* Pop the current level, and free the structure for reuse. */
1388 label_level_chain = label_level_chain->level_chain;
1389 level->level_chain = free_binding_level;
1390 free_binding_level = level;
1393 /* Push a definition or a declaration of struct, union or enum tag "name".
1394 "type" should be the type node.
1395 We assume that the tag "name" is not already defined.
1397 Note that the definition may really be just a forward reference.
1398 In that case, the TYPE_SIZE will be zero. */
1401 pushtag (name, type)
1404 register struct binding_level *b;
1406 /* Find the proper binding level for this type tag. */
1408 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1413 /* Record the identifier as the type's name if it has none. */
1415 if (TYPE_NAME (type) == 0)
1416 TYPE_NAME (type) = name;
1419 if (b == global_binding_level)
1420 b->tags = perm_tree_cons (name, type, b->tags);
1422 b->tags = saveable_tree_cons (name, type, b->tags);
1424 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1425 tagged type we just added to the current binding level. This fake
1426 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1427 to output a representation of a tagged type, and it also gives
1428 us a convenient place to record the "scope start" address for the
1431 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1433 /* An approximation for now, so we can tell this is a function-scope tag.
1434 This will be updated in poplevel. */
1435 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1438 /* Handle when a new declaration NEWDECL
1439 has the same name as an old one OLDDECL
1440 in the same binding contour.
1441 Prints an error message if appropriate.
1443 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1444 Otherwise, return 0.
1446 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1447 and OLDDECL is in an outer binding level and should thus not be changed. */
1450 duplicate_decls (newdecl, olddecl, different_binding_level)
1451 register tree newdecl, olddecl;
1452 int different_binding_level;
1454 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1455 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1456 && DECL_INITIAL (newdecl) != 0);
1457 tree oldtype = TREE_TYPE (olddecl);
1458 tree newtype = TREE_TYPE (newdecl);
1461 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1462 DECL_MACHINE_ATTRIBUTES (newdecl)
1463 = merge_machine_decl_attributes (olddecl, newdecl);
1465 if (TREE_CODE (newtype) == ERROR_MARK
1466 || TREE_CODE (oldtype) == ERROR_MARK)
1469 /* New decl is completely inconsistent with the old one =>
1470 tell caller to replace the old one.
1471 This is always an error except in the case of shadowing a builtin. */
1472 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1474 if (TREE_CODE (olddecl) == FUNCTION_DECL
1475 && (DECL_BUILT_IN (olddecl)
1476 || DECL_BUILT_IN_NONANSI (olddecl)))
1478 /* If you declare a built-in or predefined function name as static,
1479 the old definition is overridden,
1480 but optionally warn this was a bad choice of name. */
1481 if (!TREE_PUBLIC (newdecl))
1485 else if (DECL_BUILT_IN (olddecl))
1486 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1488 warning_with_decl (newdecl, "shadowing library function `%s'");
1490 /* Likewise, if the built-in is not ansi, then programs can
1491 override it even globally without an error. */
1492 else if (! DECL_BUILT_IN (olddecl))
1493 warning_with_decl (newdecl,
1494 "library function `%s' declared as non-function");
1496 else if (DECL_BUILT_IN_NONANSI (olddecl))
1497 warning_with_decl (newdecl,
1498 "built-in function `%s' declared as non-function");
1500 warning_with_decl (newdecl,
1501 "built-in function `%s' declared as non-function");
1505 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1506 error_with_decl (olddecl, "previous declaration of `%s'");
1512 /* For real parm decl following a forward decl,
1513 return 1 so old decl will be reused. */
1514 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1515 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1518 /* The new declaration is the same kind of object as the old one.
1519 The declarations may partially match. Print warnings if they don't
1520 match enough. Ultimately, copy most of the information from the new
1521 decl to the old one, and keep using the old one. */
1523 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1524 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1525 && DECL_INITIAL (olddecl) == 0)
1526 /* If -traditional, avoid error for redeclaring fcn
1527 after implicit decl. */
1529 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1530 && DECL_BUILT_IN (olddecl))
1532 /* A function declaration for a built-in function. */
1533 if (!TREE_PUBLIC (newdecl))
1535 /* If you declare a built-in function name as static, the
1536 built-in definition is overridden,
1537 but optionally warn this was a bad choice of name. */
1539 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1540 /* Discard the old built-in function. */
1543 else if (!types_match)
1545 /* Accept the return type of the new declaration if same modes. */
1546 tree oldreturntype = TREE_TYPE (oldtype);
1547 tree newreturntype = TREE_TYPE (newtype);
1549 /* Make sure we put the new type in the same obstack as the old ones.
1550 If the old types are not both in the same obstack, use the
1552 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1553 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1556 push_obstacks_nochange ();
1557 end_temporary_allocation ();
1560 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1562 /* Function types may be shared, so we can't just modify
1563 the return type of olddecl's function type. */
1565 = build_function_type (newreturntype,
1566 TYPE_ARG_TYPES (oldtype));
1568 types_match = comptypes (newtype, trytype);
1572 /* Accept harmless mismatch in first argument type also.
1574 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1575 && TYPE_ARG_TYPES (oldtype) != 0
1576 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1577 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1578 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1579 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1581 /* Function types may be shared, so we can't just modify
1582 the return type of olddecl's function type. */
1584 = build_function_type (TREE_TYPE (oldtype),
1585 tree_cons (NULL_TREE,
1586 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1587 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1589 types_match = comptypes (newtype, trytype);
1593 if (! different_binding_level)
1594 TREE_TYPE (olddecl) = oldtype;
1600 /* If types don't match for a built-in, throw away the built-in. */
1601 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1605 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1606 && DECL_SOURCE_LINE (olddecl) == 0)
1608 /* A function declaration for a predeclared function
1609 that isn't actually built in. */
1610 if (!TREE_PUBLIC (newdecl))
1612 /* If you declare it as static, the
1613 default definition is overridden. */
1616 else if (!types_match)
1618 /* If the types don't match, preserve volatility indication.
1619 Later on, we will discard everything else about the
1620 default declaration. */
1621 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1624 /* Permit char *foo () to match void *foo (...) if not pedantic,
1625 if one of them came from a system header file. */
1626 else if (!types_match
1627 && TREE_CODE (olddecl) == FUNCTION_DECL
1628 && TREE_CODE (newdecl) == FUNCTION_DECL
1629 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1630 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1631 && (DECL_IN_SYSTEM_HEADER (olddecl)
1632 || DECL_IN_SYSTEM_HEADER (newdecl))
1633 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1634 && TYPE_ARG_TYPES (oldtype) == 0
1635 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1636 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1638 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1639 && TYPE_ARG_TYPES (newtype) == 0
1640 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1641 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1644 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1645 /* Make sure we keep void * as ret type, not char *. */
1646 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1647 TREE_TYPE (newdecl) = newtype = oldtype;
1649 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1650 we will come back here again. */
1651 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1653 else if (!types_match
1654 /* Permit char *foo (int, ...); followed by char *foo ();
1656 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1658 /* Return types must still match. */
1659 && comptypes (TREE_TYPE (oldtype),
1660 TREE_TYPE (newtype))
1661 && TYPE_ARG_TYPES (newtype) == 0))
1663 error_with_decl (newdecl, "conflicting types for `%s'");
1664 /* Check for function type mismatch
1665 involving an empty arglist vs a nonempty one. */
1666 if (TREE_CODE (olddecl) == FUNCTION_DECL
1667 && comptypes (TREE_TYPE (oldtype),
1668 TREE_TYPE (newtype))
1669 && ((TYPE_ARG_TYPES (oldtype) == 0
1670 && DECL_INITIAL (olddecl) == 0)
1672 (TYPE_ARG_TYPES (newtype) == 0
1673 && DECL_INITIAL (newdecl) == 0)))
1675 /* Classify the problem further. */
1676 register tree t = TYPE_ARG_TYPES (oldtype);
1678 t = TYPE_ARG_TYPES (newtype);
1679 for (; t; t = TREE_CHAIN (t))
1681 register tree type = TREE_VALUE (t);
1683 if (TREE_CHAIN (t) == 0
1684 && TYPE_MAIN_VARIANT (type) != void_type_node)
1686 error ("A parameter list with an ellipsis can't match");
1687 error ("an empty parameter name list declaration.");
1691 if (TYPE_MAIN_VARIANT (type) == float_type_node
1692 || C_PROMOTING_INTEGER_TYPE_P (type))
1694 error ("An argument type that has a default promotion");
1695 error ("can't match an empty parameter name list declaration.");
1700 error_with_decl (olddecl, "previous declaration of `%s'");
1704 errmsg = redeclaration_error_message (newdecl, olddecl);
1707 error_with_decl (newdecl, errmsg);
1708 error_with_decl (olddecl,
1709 ((DECL_INITIAL (olddecl)
1710 && current_binding_level == global_binding_level)
1711 ? "`%s' previously defined here"
1712 : "`%s' previously declared here"));
1714 else if (TREE_CODE (newdecl) == TYPE_DECL
1715 && (DECL_IN_SYSTEM_HEADER (olddecl)
1716 || DECL_IN_SYSTEM_HEADER (newdecl)))
1718 warning_with_decl (newdecl, "redefinition of `%s'");
1721 ((DECL_INITIAL (olddecl)
1722 && current_binding_level == global_binding_level)
1723 ? "`%s' previously defined here"
1724 : "`%s' previously declared here"));
1726 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1727 && DECL_INITIAL (olddecl) != 0
1728 && TYPE_ARG_TYPES (oldtype) == 0
1729 && TYPE_ARG_TYPES (newtype) != 0
1730 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1732 register tree type, parm;
1734 /* Prototype decl follows defn w/o prototype. */
1736 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1737 type = TYPE_ARG_TYPES (newtype),
1739 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1740 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1741 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1743 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1744 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1746 errmsg = "prototype for `%s' follows and number of arguments";
1749 /* Type for passing arg must be consistent
1750 with that declared for the arg. */
1751 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1752 /* If -traditional, allow `unsigned int' instead of `int'
1753 in the prototype. */
1754 && (! (flag_traditional
1755 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1756 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1758 errmsg = "prototype for `%s' follows and argument %d";
1764 error_with_decl (newdecl, errmsg, nargs);
1765 error_with_decl (olddecl,
1766 "doesn't match non-prototype definition here");
1770 warning_with_decl (newdecl, "prototype for `%s' follows");
1771 warning_with_decl (olddecl, "non-prototype definition here");
1774 /* Warn about mismatches in various flags. */
1777 /* Warn if function is now inline
1778 but was previously declared not inline and has been called. */
1779 if (TREE_CODE (olddecl) == FUNCTION_DECL
1780 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1781 && TREE_USED (olddecl))
1782 warning_with_decl (newdecl,
1783 "`%s' declared inline after being called");
1784 if (TREE_CODE (olddecl) == FUNCTION_DECL
1785 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1786 && DECL_INITIAL (olddecl) != 0)
1787 warning_with_decl (newdecl,
1788 "`%s' declared inline after its definition");
1790 /* If pedantic, warn when static declaration follows a non-static
1791 declaration. Otherwise, do so only for functions. */
1792 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1793 && TREE_PUBLIC (olddecl)
1794 && !TREE_PUBLIC (newdecl))
1795 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1797 /* Warn when const declaration follows a non-const
1798 declaration, but not for functions. */
1799 if (TREE_CODE (olddecl) != FUNCTION_DECL
1800 && !TREE_READONLY (olddecl)
1801 && TREE_READONLY (newdecl))
1802 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1803 /* These bits are logically part of the type, for variables.
1804 But not for functions
1805 (where qualifiers are not valid ANSI anyway). */
1806 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1807 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1808 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1809 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1813 /* Optionally warn about more than one declaration for the same name. */
1814 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1815 /* Don't warn about a function declaration
1816 followed by a definition. */
1817 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1818 && DECL_INITIAL (olddecl) == 0)
1819 /* Don't warn about extern decl followed by (tentative) definition. */
1820 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1822 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1823 warning_with_decl (olddecl, "previous declaration of `%s'");
1826 /* Copy all the DECL_... slots specified in the new decl
1827 except for any that we copy here from the old type.
1829 Past this point, we don't change OLDTYPE and NEWTYPE
1830 even if we change the types of NEWDECL and OLDDECL. */
1834 /* When copying info to olddecl, we store into write_olddecl
1835 instead. This allows us to avoid modifying olddecl when
1836 different_binding_level is true. */
1837 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1839 /* Make sure we put the new type in the same obstack as the old ones.
1840 If the old types are not both in the same obstack, use the permanent
1842 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1843 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1846 push_obstacks_nochange ();
1847 end_temporary_allocation ();
1850 /* Merge the data types specified in the two decls. */
1851 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1853 if (different_binding_level)
1855 = build_type_attribute_variant
1857 merge_attributes (TYPE_ATTRIBUTES (newtype),
1858 TYPE_ATTRIBUTES (oldtype)));
1861 = TREE_TYPE (olddecl)
1862 = common_type (newtype, oldtype);
1865 /* Lay the type out, unless already done. */
1866 if (oldtype != TREE_TYPE (newdecl))
1868 if (TREE_TYPE (newdecl) != error_mark_node)
1869 layout_type (TREE_TYPE (newdecl));
1870 if (TREE_CODE (newdecl) != FUNCTION_DECL
1871 && TREE_CODE (newdecl) != TYPE_DECL
1872 && TREE_CODE (newdecl) != CONST_DECL)
1873 layout_decl (newdecl, 0);
1877 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1878 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1879 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1880 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1881 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1884 /* Keep the old rtl since we can safely use it. */
1885 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1887 /* Merge the type qualifiers. */
1888 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1889 && !TREE_THIS_VOLATILE (newdecl))
1890 TREE_THIS_VOLATILE (write_olddecl) = 0;
1891 if (TREE_READONLY (newdecl))
1892 TREE_READONLY (write_olddecl) = 1;
1893 if (TREE_THIS_VOLATILE (newdecl))
1895 TREE_THIS_VOLATILE (write_olddecl) = 1;
1896 if (TREE_CODE (newdecl) == VAR_DECL)
1897 make_var_volatile (newdecl);
1900 /* Keep source location of definition rather than declaration. */
1901 /* When called with different_binding_level set, keep the old
1902 information so that meaningful diagnostics can be given. */
1903 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1904 && ! different_binding_level)
1906 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1907 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1910 /* Merge the unused-warning information. */
1911 if (DECL_IN_SYSTEM_HEADER (olddecl))
1912 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1913 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1914 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1916 /* Merge the initialization information. */
1917 /* When called with different_binding_level set, don't copy over
1918 DECL_INITIAL, so that we don't accidentally change function
1919 declarations into function definitions. */
1920 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1921 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1923 /* Merge the section attribute.
1924 We want to issue an error if the sections conflict but that must be
1925 done later in decl_attributes since we are called before attributes
1927 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1928 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1930 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1932 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1933 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1938 /* If cannot merge, then use the new type and qualifiers,
1939 and don't preserve the old rtl. */
1940 else if (! different_binding_level)
1942 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1943 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1944 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1945 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1948 /* Merge the storage class information. */
1949 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1950 /* For functions, static overrides non-static. */
1951 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1953 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1954 /* This is since we don't automatically
1955 copy the attributes of NEWDECL into OLDDECL. */
1956 /* No need to worry about different_binding_level here because
1957 then TREE_PUBLIC (newdecl) was true. */
1958 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1959 /* If this clears `static', clear it in the identifier too. */
1960 if (! TREE_PUBLIC (olddecl))
1961 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1963 if (DECL_EXTERNAL (newdecl))
1965 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1966 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1967 /* An extern decl does not override previous storage class. */
1968 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1969 if (! DECL_EXTERNAL (newdecl))
1970 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1974 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1975 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1978 /* If either decl says `inline', this fn is inline,
1979 unless its definition was passed already. */
1980 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1981 DECL_INLINE (olddecl) = 1;
1982 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1984 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1986 if (DECL_BUILT_IN (olddecl))
1988 /* Get rid of any built-in function if new arg types don't match it
1989 or if we have a function definition. */
1990 if (! types_match || new_is_definition)
1992 if (! different_binding_level)
1994 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1995 DECL_BUILT_IN (olddecl) = 0;
2000 /* If redeclaring a builtin function, and not a definition,
2001 it stays built in. */
2002 DECL_BUILT_IN (newdecl) = 1;
2003 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2006 /* Also preserve various other info from the definition. */
2007 else if (! new_is_definition)
2008 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2009 if (! new_is_definition)
2011 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2012 /* When called with different_binding_level set, don't copy over
2013 DECL_INITIAL, so that we don't accidentally change function
2014 declarations into function definitions. */
2015 if (! different_binding_level)
2016 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2017 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2018 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2019 if (DECL_INLINE (newdecl))
2020 DECL_ABSTRACT_ORIGIN (newdecl) = olddecl;
2023 if (different_binding_level)
2025 /* Don't output a duplicate symbol or debugging information for this
2028 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2029 just have two declarations without a definition. VAR_DECLs may need
2030 the same treatment, I'm not sure. */
2031 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2032 DECL_IGNORED_P (newdecl) = 1;
2034 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2038 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2039 But preserve OLDDECL's DECL_UID. */
2041 register unsigned olddecl_uid = DECL_UID (olddecl);
2043 bcopy ((char *) newdecl + sizeof (struct tree_common),
2044 (char *) olddecl + sizeof (struct tree_common),
2045 sizeof (struct tree_decl) - sizeof (struct tree_common));
2046 DECL_UID (olddecl) = olddecl_uid;
2049 /* NEWDECL contains the merged attribute lists.
2050 Update OLDDECL to be the same. */
2051 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2056 /* Record a decl-node X as belonging to the current lexical scope.
2057 Check for errors (such as an incompatible declaration for the same
2058 name already seen in the same scope).
2060 Returns either X or an old decl for the same name.
2061 If an old decl is returned, it may have been smashed
2062 to agree with what X says. */
2069 register tree name = DECL_NAME (x);
2070 register struct binding_level *b = current_binding_level;
2072 DECL_CONTEXT (x) = current_function_decl;
2073 /* A local extern declaration for a function doesn't constitute nesting.
2074 A local auto declaration does, since it's a forward decl
2075 for a nested function coming later. */
2076 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2077 && DECL_EXTERNAL (x))
2078 DECL_CONTEXT (x) = 0;
2080 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2081 && x != IDENTIFIER_IMPLICIT_DECL (name)
2082 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2083 && !DECL_IN_SYSTEM_HEADER (x))
2084 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2090 int different_binding_level = 0;
2092 t = lookup_name_current_level (name);
2093 /* Don't type check externs here when -traditional. This is so that
2094 code with conflicting declarations inside blocks will get warnings
2095 not errors. X11 for instance depends on this. */
2096 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2098 t = IDENTIFIER_GLOBAL_VALUE (name);
2099 /* Type decls at global scope don't conflict with externs declared
2100 inside lexical blocks. */
2101 if (t && TREE_CODE (t) == TYPE_DECL)
2103 different_binding_level = 1;
2105 if (t != 0 && t == error_mark_node)
2106 /* error_mark_node is 0 for a while during initialization! */
2109 error_with_decl (x, "`%s' used prior to declaration");
2114 file = DECL_SOURCE_FILE (t);
2115 line = DECL_SOURCE_LINE (t);
2118 /* If this decl is `static' and an implicit decl was seen previously,
2119 warn. But don't complain if -traditional,
2120 since traditional compilers don't complain. */
2121 if (! flag_traditional && TREE_PUBLIC (name)
2122 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2123 sets this for all functions. */
2124 && ! TREE_PUBLIC (x)
2125 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2126 /* We used to warn also for explicit extern followed by static,
2127 but sometimes you need to do it that way. */
2128 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2130 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2131 IDENTIFIER_POINTER (name));
2132 pedwarn_with_file_and_line
2133 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2134 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2135 "previous declaration of `%s'",
2136 IDENTIFIER_POINTER (name));
2137 TREE_THIS_VOLATILE (name) = 1;
2140 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2142 if (TREE_CODE (t) == PARM_DECL)
2144 /* Don't allow more than one "real" duplicate
2145 of a forward parm decl. */
2146 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2152 /* If we are processing a typedef statement, generate a whole new
2153 ..._TYPE node (which will be just an variant of the existing
2154 ..._TYPE node with identical properties) and then install the
2155 TYPE_DECL node generated to represent the typedef name as the
2156 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2158 The whole point here is to end up with a situation where each
2159 and every ..._TYPE node the compiler creates will be uniquely
2160 associated with AT MOST one node representing a typedef name.
2161 This way, even though the compiler substitutes corresponding
2162 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2163 early on, later parts of the compiler can always do the reverse
2164 translation and get back the corresponding typedef name. For
2167 typedef struct S MY_TYPE;
2170 Later parts of the compiler might only know that `object' was of
2171 type `struct S' if it were not for code just below. With this
2172 code however, later parts of the compiler see something like:
2174 struct S' == struct S
2175 typedef struct S' MY_TYPE;
2178 And they can then deduce (from the node for type struct S') that
2179 the original object declaration was:
2183 Being able to do this is important for proper support of protoize,
2184 and also for generating precise symbolic debugging information
2185 which takes full account of the programmer's (typedef) vocabulary.
2187 Obviously, we don't want to generate a duplicate ..._TYPE node if
2188 the TYPE_DECL node that we are now processing really represents a
2189 standard built-in type.
2191 Since all standard types are effectively declared at line zero
2192 in the source file, we can easily check to see if we are working
2193 on a standard type by checking the current value of lineno. */
2195 if (TREE_CODE (x) == TYPE_DECL)
2197 if (DECL_SOURCE_LINE (x) == 0)
2199 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2200 TYPE_NAME (TREE_TYPE (x)) = x;
2202 else if (TREE_TYPE (x) != error_mark_node
2203 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2205 tree tt = TREE_TYPE (x);
2206 DECL_ORIGINAL_TYPE (x) = tt;
2207 tt = build_type_copy (tt);
2213 /* Multiple external decls of the same identifier ought to match.
2214 Check against both global declarations (when traditional) and out of
2215 scope (limbo) block level declarations.
2217 We get warnings about inline functions where they are defined.
2218 Avoid duplicate warnings where they are used. */
2219 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2223 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2224 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2225 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2226 decl = IDENTIFIER_GLOBAL_VALUE (name);
2227 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2228 /* Decls in limbo are always extern, so no need to check that. */
2229 decl = IDENTIFIER_LIMBO_VALUE (name);
2233 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2234 /* If old decl is built-in, we already warned if we should. */
2235 && !DECL_BUILT_IN (decl))
2237 pedwarn_with_decl (x,
2238 "type mismatch with previous external decl");
2239 pedwarn_with_decl (decl, "previous external decl of `%s'");
2243 /* If a function has had an implicit declaration, and then is defined,
2244 make sure they are compatible. */
2246 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2247 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2248 && TREE_CODE (x) == FUNCTION_DECL
2249 && ! comptypes (TREE_TYPE (x),
2250 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2252 warning_with_decl (x, "type mismatch with previous implicit declaration");
2253 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2254 "previous implicit declaration of `%s'");
2257 /* In PCC-compatibility mode, extern decls of vars with no current decl
2258 take effect at top level no matter where they are. */
2259 if (flag_traditional && DECL_EXTERNAL (x)
2260 && lookup_name (name) == 0)
2262 tree type = TREE_TYPE (x);
2264 /* But don't do this if the type contains temporary nodes. */
2267 if (type == error_mark_node)
2269 if (! TREE_PERMANENT (type))
2271 warning_with_decl (x, "type of external `%s' is not global");
2272 /* By exiting the loop early, we leave TYPE nonzero,
2273 and thus prevent globalization of the decl. */
2276 else if (TREE_CODE (type) == FUNCTION_TYPE
2277 && TYPE_ARG_TYPES (type) != 0)
2278 /* The types might not be truly local,
2279 but the list of arg types certainly is temporary.
2280 Since prototypes are nontraditional,
2281 ok not to do the traditional thing. */
2283 type = TREE_TYPE (type);
2287 b = global_binding_level;
2290 /* This name is new in its binding level.
2291 Install the new declaration and return it. */
2292 if (b == global_binding_level)
2294 /* Install a global value. */
2296 /* If the first global decl has external linkage,
2297 warn if we later see static one. */
2298 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2299 TREE_PUBLIC (name) = 1;
2301 IDENTIFIER_GLOBAL_VALUE (name) = x;
2303 /* We no longer care about any previous block level declarations. */
2304 IDENTIFIER_LIMBO_VALUE (name) = 0;
2306 /* Don't forget if the function was used via an implicit decl. */
2307 if (IDENTIFIER_IMPLICIT_DECL (name)
2308 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2309 TREE_USED (x) = 1, TREE_USED (name) = 1;
2311 /* Don't forget if its address was taken in that way. */
2312 if (IDENTIFIER_IMPLICIT_DECL (name)
2313 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2314 TREE_ADDRESSABLE (x) = 1;
2316 /* Warn about mismatches against previous implicit decl. */
2317 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2318 /* If this real decl matches the implicit, don't complain. */
2319 && ! (TREE_CODE (x) == FUNCTION_DECL
2320 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2321 == integer_type_node)))
2322 pedwarn ("`%s' was previously implicitly declared to return `int'",
2323 IDENTIFIER_POINTER (name));
2325 /* If this decl is `static' and an `extern' was seen previously,
2326 that is erroneous. */
2327 if (TREE_PUBLIC (name)
2328 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2330 /* Okay to redeclare an ANSI built-in as static. */
2331 if (t != 0 && DECL_BUILT_IN (t))
2333 /* Okay to declare a non-ANSI built-in as anything. */
2334 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2336 /* Okay to have global type decl after an earlier extern
2337 declaration inside a lexical block. */
2338 else if (TREE_CODE (x) == TYPE_DECL)
2340 else if (IDENTIFIER_IMPLICIT_DECL (name))
2342 if (! TREE_THIS_VOLATILE (name))
2343 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2344 IDENTIFIER_POINTER (name));
2347 pedwarn ("`%s' was declared `extern' and later `static'",
2348 IDENTIFIER_POINTER (name));
2353 /* Here to install a non-global value. */
2354 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2355 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2356 IDENTIFIER_LOCAL_VALUE (name) = x;
2358 /* If this is an extern function declaration, see if we
2359 have a global definition or declaration for the function. */
2361 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2363 && TREE_CODE (x) == FUNCTION_DECL
2364 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2366 /* We have one. Their types must agree. */
2367 if (! comptypes (TREE_TYPE (x),
2368 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2369 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2372 /* Inner extern decl is inline if global one is.
2373 Copy enough to really inline it. */
2374 if (DECL_INLINE (oldglobal))
2376 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2377 DECL_INITIAL (x) = (current_function_decl == oldglobal
2378 ? 0 : DECL_INITIAL (oldglobal));
2379 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2380 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2381 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2382 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2383 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2384 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2386 /* Inner extern decl is built-in if global one is. */
2387 if (DECL_BUILT_IN (oldglobal))
2389 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2390 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2392 /* Keep the arg types from a file-scope fcn defn. */
2393 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2394 && DECL_INITIAL (oldglobal)
2395 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2396 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2400 #if 0 /* This case is probably sometimes the right thing to do. */
2401 /* If we have a local external declaration,
2402 then any file-scope declaration should not
2403 have been static. */
2404 if (oldlocal == 0 && oldglobal != 0
2405 && !TREE_PUBLIC (oldglobal)
2406 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2407 warning ("`%s' locally external but globally static",
2408 IDENTIFIER_POINTER (name));
2411 /* If we have a local external declaration,
2412 and no file-scope declaration has yet been seen,
2413 then if we later have a file-scope decl it must not be static. */
2415 && DECL_EXTERNAL (x)
2419 TREE_PUBLIC (name) = 1;
2421 /* Save this decl, so that we can do type checking against
2422 other decls after it falls out of scope.
2424 Only save it once. This prevents temporary decls created in
2425 expand_inline_function from being used here, since this
2426 will have been set when the inline function was parsed.
2427 It also helps give slightly better warnings. */
2428 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2429 IDENTIFIER_LIMBO_VALUE (name) = x;
2432 /* Warn if shadowing an argument at the top level of the body. */
2433 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2434 /* This warning doesn't apply to the parms of a nested fcn. */
2435 && ! current_binding_level->parm_flag
2436 /* Check that this is one level down from the parms. */
2437 && current_binding_level->level_chain->parm_flag
2438 /* Check that the decl being shadowed
2439 comes from the parm level, one level up. */
2440 && chain_member (oldlocal, current_binding_level->level_chain->names))
2442 if (TREE_CODE (oldlocal) == PARM_DECL)
2443 pedwarn ("declaration of `%s' shadows a parameter",
2444 IDENTIFIER_POINTER (name));
2446 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2447 IDENTIFIER_POINTER (name));
2450 /* Maybe warn if shadowing something else. */
2451 else if (warn_shadow && !DECL_EXTERNAL (x)
2452 /* No shadow warnings for internally generated vars. */
2453 && DECL_SOURCE_LINE (x) != 0
2454 /* No shadow warnings for vars made for inlining. */
2455 && ! DECL_FROM_INLINE (x))
2457 char *warnstring = 0;
2459 if (TREE_CODE (x) == PARM_DECL
2460 && current_binding_level->level_chain->parm_flag)
2461 /* Don't warn about the parm names in function declarator
2462 within a function declarator.
2463 It would be nice to avoid warning in any function
2464 declarator in a declaration, as opposed to a definition,
2465 but there is no way to tell it's not a definition. */
2467 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2468 warnstring = "declaration of `%s' shadows a parameter";
2469 else if (oldlocal != 0)
2470 warnstring = "declaration of `%s' shadows previous local";
2471 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2472 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2473 warnstring = "declaration of `%s' shadows global declaration";
2476 warning (warnstring, IDENTIFIER_POINTER (name));
2479 /* If storing a local value, there may already be one (inherited).
2480 If so, record it for restoration when this binding level ends. */
2482 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2485 /* Keep count of variables in this level with incomplete type. */
2486 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2490 /* Put decls on list in reverse order.
2491 We will reverse them later if necessary. */
2492 TREE_CHAIN (x) = b->names;
2498 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2501 pushdecl_top_level (x)
2505 register struct binding_level *b = current_binding_level;
2507 current_binding_level = global_binding_level;
2509 current_binding_level = b;
2513 /* Generate an implicit declaration for identifier FUNCTIONID
2514 as a function of type int (). Print a warning if appropriate. */
2517 implicitly_declare (functionid)
2521 int traditional_warning = 0;
2522 /* Only one "implicit declaration" warning per identifier. */
2523 int implicit_warning;
2525 /* Save the decl permanently so we can warn if definition follows. */
2526 push_obstacks_nochange ();
2527 end_temporary_allocation ();
2529 /* We used to reuse an old implicit decl here,
2530 but this loses with inline functions because it can clobber
2531 the saved decl chains. */
2532 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2533 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2535 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2537 /* Warn of implicit decl following explicit local extern decl.
2538 This is probably a program designed for traditional C. */
2539 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2540 traditional_warning = 1;
2542 /* Warn once of an implicit declaration. */
2543 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2545 DECL_EXTERNAL (decl) = 1;
2546 TREE_PUBLIC (decl) = 1;
2548 /* Record that we have an implicit decl and this is it. */
2549 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2551 /* ANSI standard says implicit declarations are in the innermost block.
2552 So we record the decl in the standard fashion.
2553 If flag_traditional is set, pushdecl does it top-level. */
2556 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2557 maybe_objc_check_decl (decl);
2559 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2561 if (mesg_implicit_function_declaration && implicit_warning)
2563 if (mesg_implicit_function_declaration == 2)
2564 error ("implicit declaration of function `%s'",
2565 IDENTIFIER_POINTER (functionid));
2567 warning ("implicit declaration of function `%s'",
2568 IDENTIFIER_POINTER (functionid));
2570 else if (warn_traditional && traditional_warning)
2571 warning ("function `%s' was previously declared within a block",
2572 IDENTIFIER_POINTER (functionid));
2574 /* Write a record describing this implicit function declaration to the
2575 prototypes file (if requested). */
2577 gen_aux_info_record (decl, 0, 1, 0);
2584 /* Return zero if the declaration NEWDECL is valid
2585 when the declaration OLDDECL (assumed to be for the same name)
2586 has already been seen.
2587 Otherwise return an error message format string with a %s
2588 where the identifier should go. */
2591 redeclaration_error_message (newdecl, olddecl)
2592 tree newdecl, olddecl;
2594 if (TREE_CODE (newdecl) == TYPE_DECL)
2596 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2598 /* pushdecl creates distinct types for TYPE_DECLs by calling
2599 build_type_copy, so the above comparison generally fails. We do
2600 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2601 is equivalent to what this code used to do before the build_type_copy
2602 call. The variant type distinction should not matter for traditional
2603 code, because it doesn't have type qualifiers. */
2604 if (flag_traditional
2605 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2607 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2609 return "redefinition of `%s'";
2611 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2613 /* Declarations of functions can insist on internal linkage
2614 but they can't be inconsistent with internal linkage,
2615 so there can be no error on that account.
2616 However defining the same name twice is no good. */
2617 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2618 /* However, defining once as extern inline and a second
2619 time in another way is ok. */
2620 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2621 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2622 return "redefinition of `%s'";
2625 else if (current_binding_level == global_binding_level)
2627 /* Objects declared at top level: */
2628 /* If at least one is a reference, it's ok. */
2629 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2631 /* Reject two definitions. */
2632 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2633 return "redefinition of `%s'";
2634 /* Now we have two tentative defs, or one tentative and one real def. */
2635 /* Insist that the linkage match. */
2636 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2637 return "conflicting declarations of `%s'";
2640 else if (current_binding_level->parm_flag
2641 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2645 /* Newdecl has block scope. If olddecl has block scope also, then
2646 reject two definitions, and reject a definition together with an
2647 external reference. Otherwise, it is OK, because newdecl must
2648 be an extern reference to olddecl. */
2649 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2650 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2651 return "redeclaration of `%s'";
2656 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2657 Create one if none exists so far for the current function.
2658 This function is called for both label definitions and label references. */
2664 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2666 if (current_function_decl == 0)
2668 error ("label %s referenced outside of any function",
2669 IDENTIFIER_POINTER (id));
2673 /* Use a label already defined or ref'd with this name. */
2676 /* But not if it is inherited and wasn't declared to be inheritable. */
2677 if (DECL_CONTEXT (decl) != current_function_decl
2678 && ! C_DECLARED_LABEL_FLAG (decl))
2679 return shadow_label (id);
2683 decl = build_decl (LABEL_DECL, id, void_type_node);
2685 /* Make sure every label has an rtx. */
2688 /* A label not explicitly declared must be local to where it's ref'd. */
2689 DECL_CONTEXT (decl) = current_function_decl;
2691 DECL_MODE (decl) = VOIDmode;
2693 /* Say where one reference is to the label,
2694 for the sake of the error if it is not defined. */
2695 DECL_SOURCE_LINE (decl) = lineno;
2696 DECL_SOURCE_FILE (decl) = input_filename;
2698 IDENTIFIER_LABEL_VALUE (id) = decl;
2700 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2705 /* Make a label named NAME in the current function,
2706 shadowing silently any that may be inherited from containing functions
2707 or containing scopes.
2709 Note that valid use, if the label being shadowed
2710 comes from another scope in the same function,
2711 requires calling declare_nonlocal_label right away. */
2717 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2723 /* Check to make sure that the label hasn't already been declared
2724 at this label scope */
2725 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2726 if (TREE_VALUE (dup) == decl)
2728 error ("duplicate label declaration `%s'",
2729 IDENTIFIER_POINTER (name));
2730 error_with_decl (TREE_VALUE (dup),
2731 "this is a previous declaration");
2732 /* Just use the previous declaration. */
2733 return lookup_label (name);
2736 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2737 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2740 return lookup_label (name);
2743 /* Define a label, specifying the location in the source file.
2744 Return the LABEL_DECL node for the label, if the definition is valid.
2745 Otherwise return 0. */
2748 define_label (filename, line, name)
2753 tree decl = lookup_label (name);
2755 /* If label with this name is known from an outer context, shadow it. */
2756 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2758 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2759 IDENTIFIER_LABEL_VALUE (name) = 0;
2760 decl = lookup_label (name);
2763 if (DECL_INITIAL (decl) != 0)
2765 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2770 /* Mark label as having been defined. */
2771 DECL_INITIAL (decl) = error_mark_node;
2772 /* Say where in the source. */
2773 DECL_SOURCE_FILE (decl) = filename;
2774 DECL_SOURCE_LINE (decl) = line;
2779 /* Return the list of declarations of the current level.
2780 Note that this list is in reverse order unless/until
2781 you nreverse it; and when you do nreverse it, you must
2782 store the result back using `storedecls' or you will lose. */
2787 return current_binding_level->names;
2790 /* Return the list of type-tags (for structs, etc) of the current level. */
2795 return current_binding_level->tags;
2798 /* Store the list of declarations of the current level.
2799 This is done for the parameter declarations of a function being defined,
2800 after they are modified in the light of any missing parameters. */
2806 current_binding_level->names = decls;
2809 /* Similarly, store the list of tags of the current level. */
2815 current_binding_level->tags = tags;
2818 /* Given NAME, an IDENTIFIER_NODE,
2819 return the structure (or union or enum) definition for that name.
2820 Searches binding levels from BINDING_LEVEL up to the global level.
2821 If THISLEVEL_ONLY is nonzero, searches only the specified context
2822 (but skips any tag-transparent contexts to find one that is
2823 meaningful for tags).
2824 CODE says which kind of type the caller wants;
2825 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2826 If the wrong kind of type is found, an error is reported. */
2829 lookup_tag (code, name, binding_level, thislevel_only)
2830 enum tree_code code;
2831 struct binding_level *binding_level;
2835 register struct binding_level *level;
2837 for (level = binding_level; level; level = level->level_chain)
2840 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2842 if (TREE_PURPOSE (tail) == name)
2844 if (TREE_CODE (TREE_VALUE (tail)) != code)
2846 /* Definition isn't the kind we were looking for. */
2847 pending_invalid_xref = name;
2848 pending_invalid_xref_file = input_filename;
2849 pending_invalid_xref_line = lineno;
2851 return TREE_VALUE (tail);
2854 if (thislevel_only && ! level->tag_transparent)
2860 /* Print an error message now
2861 for a recent invalid struct, union or enum cross reference.
2862 We don't print them immediately because they are not invalid
2863 when used in the `struct foo;' construct for shadowing. */
2866 pending_xref_error ()
2868 if (pending_invalid_xref != 0)
2869 error_with_file_and_line (pending_invalid_xref_file,
2870 pending_invalid_xref_line,
2871 "`%s' defined as wrong kind of tag",
2872 IDENTIFIER_POINTER (pending_invalid_xref));
2873 pending_invalid_xref = 0;
2876 /* Given a type, find the tag that was defined for it and return the tag name.
2877 Otherwise return 0. */
2880 lookup_tag_reverse (type)
2883 register struct binding_level *level;
2885 for (level = current_binding_level; level; level = level->level_chain)
2888 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2890 if (TREE_VALUE (tail) == type)
2891 return TREE_PURPOSE (tail);
2897 /* Look up NAME in the current binding level and its superiors
2898 in the namespace of variables, functions and typedefs.
2899 Return a ..._DECL node of some kind representing its definition,
2900 or return 0 if it is undefined. */
2907 if (current_binding_level != global_binding_level
2908 && IDENTIFIER_LOCAL_VALUE (name))
2909 val = IDENTIFIER_LOCAL_VALUE (name);
2911 val = IDENTIFIER_GLOBAL_VALUE (name);
2915 /* Similar to `lookup_name' but look only at current binding level. */
2918 lookup_name_current_level (name)
2923 if (current_binding_level == global_binding_level)
2924 return IDENTIFIER_GLOBAL_VALUE (name);
2926 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2929 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2930 if (DECL_NAME (t) == name)
2936 /* Create the predefined scalar types of C,
2937 and some nodes representing standard constants (0, 1, (void *) 0).
2938 Initialize the global binding level.
2939 Make definitions for built-in primitive functions. */
2942 init_decl_processing ()
2944 register tree endlink;
2945 /* Either char* or void*. */
2946 tree traditional_ptr_type_node;
2947 /* Data types of memcpy and strlen. */
2948 tree memcpy_ftype, memset_ftype, strlen_ftype;
2949 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
2950 int wchar_type_size;
2952 tree array_domain_type;
2954 current_function_decl = NULL;
2955 named_labels = NULL;
2956 current_binding_level = NULL_BINDING_LEVEL;
2957 free_binding_level = NULL_BINDING_LEVEL;
2958 pushlevel (0); /* make the binding_level structure for global names */
2959 global_binding_level = current_binding_level;
2961 /* Define `int' and `char' first so that dbx will output them first. */
2963 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2964 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2965 integer_type_node));
2967 /* Define `char', which is like either `signed char' or `unsigned char'
2968 but not the same as either. */
2972 ? make_signed_type (CHAR_TYPE_SIZE)
2973 : make_unsigned_type (CHAR_TYPE_SIZE));
2974 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2977 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2978 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2979 long_integer_type_node));
2981 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2982 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2983 unsigned_type_node));
2985 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2986 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2987 long_unsigned_type_node));
2989 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2990 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2991 long_long_integer_type_node));
2993 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2994 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2995 long_long_unsigned_type_node));
2997 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2998 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2999 short_integer_type_node));
3001 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
3002 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3003 short_unsigned_type_node));
3005 /* `unsigned long' is the standard type for sizeof.
3006 Traditionally, use a signed type.
3007 Note that stddef.h uses `unsigned long',
3008 and this must agree, even if long and int are the same size. */
3010 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3011 if (flag_traditional && TREE_UNSIGNED (sizetype))
3012 set_sizetype (signed_type (sizetype));
3015 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3017 error_mark_node = make_node (ERROR_MARK);
3018 TREE_TYPE (error_mark_node) = error_mark_node;
3020 /* Define both `signed char' and `unsigned char'. */
3021 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3022 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3023 signed_char_type_node));
3025 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3026 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3027 unsigned_char_type_node));
3029 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3030 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3032 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3033 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3035 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3036 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3038 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3039 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3041 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3042 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3044 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3045 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3047 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3050 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3051 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3053 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3054 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3056 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3057 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3059 float_type_node = make_node (REAL_TYPE);
3060 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3061 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3063 layout_type (float_type_node);
3065 double_type_node = make_node (REAL_TYPE);
3066 if (flag_short_double)
3067 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3069 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3070 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3072 layout_type (double_type_node);
3074 long_double_type_node = make_node (REAL_TYPE);
3075 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3076 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3077 long_double_type_node));
3078 layout_type (long_double_type_node);
3080 complex_integer_type_node = make_node (COMPLEX_TYPE);
3081 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3082 complex_integer_type_node));
3083 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3084 layout_type (complex_integer_type_node);
3086 complex_float_type_node = make_node (COMPLEX_TYPE);
3087 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3088 complex_float_type_node));
3089 TREE_TYPE (complex_float_type_node) = float_type_node;
3090 layout_type (complex_float_type_node);
3092 complex_double_type_node = make_node (COMPLEX_TYPE);
3093 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3094 complex_double_type_node));
3095 TREE_TYPE (complex_double_type_node) = double_type_node;
3096 layout_type (complex_double_type_node);
3098 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3099 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3100 complex_long_double_type_node));
3101 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3102 layout_type (complex_long_double_type_node);
3105 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3106 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3107 signed_wchar_type_node = signed_type (wchar_type_node);
3108 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3110 integer_zero_node = build_int_2 (0, 0);
3111 TREE_TYPE (integer_zero_node) = integer_type_node;
3112 integer_one_node = build_int_2 (1, 0);
3113 TREE_TYPE (integer_one_node) = integer_type_node;
3115 boolean_type_node = integer_type_node;
3116 boolean_true_node = integer_one_node;
3117 boolean_false_node = integer_zero_node;
3119 size_zero_node = build_int_2 (0, 0);
3120 TREE_TYPE (size_zero_node) = sizetype;
3121 size_one_node = build_int_2 (1, 0);
3122 TREE_TYPE (size_one_node) = sizetype;
3124 void_type_node = make_node (VOID_TYPE);
3125 pushdecl (build_decl (TYPE_DECL,
3126 ridpointers[(int) RID_VOID], void_type_node));
3127 layout_type (void_type_node); /* Uses integer_zero_node */
3128 /* We are not going to have real types in C with less than byte alignment,
3129 so we might as well not have any types that claim to have it. */
3130 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3132 null_pointer_node = build_int_2 (0, 0);
3133 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3134 layout_type (TREE_TYPE (null_pointer_node));
3136 string_type_node = build_pointer_type (char_type_node);
3137 const_string_type_node
3138 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3140 /* Make a type to be the domain of a few array types
3141 whose domains don't really matter.
3142 200 is small enough that it always fits in size_t
3143 and large enough that it can hold most function names for the
3144 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3145 array_domain_type = build_index_type (build_int_2 (200, 0));
3147 /* make a type for arrays of characters.
3148 With luck nothing will ever really depend on the length of this
3150 char_array_type_node
3151 = build_array_type (char_type_node, array_domain_type);
3152 /* Likewise for arrays of ints. */
3154 = build_array_type (integer_type_node, array_domain_type);
3155 /* This is for wide string constants. */
3156 wchar_array_type_node
3157 = build_array_type (wchar_type_node, array_domain_type);
3159 default_function_type
3160 = build_function_type (integer_type_node, NULL_TREE);
3162 ptr_type_node = build_pointer_type (void_type_node);
3164 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3166 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3169 = build_function_type (void_type_node, NULL_TREE);
3172 = build_function_type (float_type_node,
3173 tree_cons (NULL_TREE, float_type_node, endlink));
3176 = build_function_type (double_type_node,
3177 tree_cons (NULL_TREE, double_type_node, endlink));
3179 ldouble_ftype_ldouble
3180 = build_function_type (long_double_type_node,
3181 tree_cons (NULL_TREE, long_double_type_node,
3184 double_ftype_double_double
3185 = build_function_type (double_type_node,
3186 tree_cons (NULL_TREE, double_type_node,
3187 tree_cons (NULL_TREE,
3188 double_type_node, endlink)));
3191 = build_function_type (integer_type_node,
3192 tree_cons (NULL_TREE, integer_type_node, endlink));
3195 = build_function_type (long_integer_type_node,
3196 tree_cons (NULL_TREE,
3197 long_integer_type_node, endlink));
3199 void_ftype_ptr_ptr_int
3200 = build_function_type (void_type_node,
3201 tree_cons (NULL_TREE, ptr_type_node,
3202 tree_cons (NULL_TREE, ptr_type_node,
3203 tree_cons (NULL_TREE,
3207 int_ftype_cptr_cptr_sizet
3208 = build_function_type (integer_type_node,
3209 tree_cons (NULL_TREE, const_ptr_type_node,
3210 tree_cons (NULL_TREE, const_ptr_type_node,
3211 tree_cons (NULL_TREE,
3215 void_ftype_ptr_int_int
3216 = build_function_type (void_type_node,
3217 tree_cons (NULL_TREE, ptr_type_node,
3218 tree_cons (NULL_TREE, integer_type_node,
3219 tree_cons (NULL_TREE,
3223 string_ftype_ptr_ptr /* strcpy prototype */
3224 = build_function_type (string_type_node,
3225 tree_cons (NULL_TREE, string_type_node,
3226 tree_cons (NULL_TREE,
3227 const_string_type_node,
3230 int_ftype_string_string /* strcmp prototype */
3231 = build_function_type (integer_type_node,
3232 tree_cons (NULL_TREE, const_string_type_node,
3233 tree_cons (NULL_TREE,
3234 const_string_type_node,
3237 strlen_ftype /* strlen prototype */
3238 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3239 tree_cons (NULL_TREE, const_string_type_node,
3242 traditional_ptr_type_node
3243 = (flag_traditional ? string_type_node : ptr_type_node);
3245 memcpy_ftype /* memcpy prototype */
3246 = build_function_type (traditional_ptr_type_node,
3247 tree_cons (NULL_TREE, ptr_type_node,
3248 tree_cons (NULL_TREE, const_ptr_type_node,
3249 tree_cons (NULL_TREE,
3253 memset_ftype /* memset prototype */
3254 = build_function_type (traditional_ptr_type_node,
3255 tree_cons (NULL_TREE, ptr_type_node,
3256 tree_cons (NULL_TREE, integer_type_node,
3257 tree_cons (NULL_TREE,
3261 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3263 = build_function_type (ptr_type_node,
3264 tree_cons (NULL_TREE, ptr_type_node, endlink));
3266 builtin_function ("__builtin_constant_p", default_function_type,
3267 BUILT_IN_CONSTANT_P, NULL_PTR);
3269 builtin_function ("__builtin_return_address",
3270 build_function_type (ptr_type_node,
3271 tree_cons (NULL_TREE,
3274 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3276 builtin_function ("__builtin_frame_address",
3277 build_function_type (ptr_type_node,
3278 tree_cons (NULL_TREE,
3281 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3283 builtin_function ("__builtin_aggregate_incoming_address",
3284 build_function_type (ptr_type_node, NULL_TREE),
3285 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3287 /* Hooks for the DWARF 2 __throw routine. */
3288 builtin_function ("__builtin_unwind_init",
3289 build_function_type (void_type_node, endlink),
3290 BUILT_IN_UNWIND_INIT, NULL_PTR);
3291 builtin_function ("__builtin_fp", ptr_ftype_void, BUILT_IN_FP, NULL_PTR);
3292 builtin_function ("__builtin_sp", ptr_ftype_void, BUILT_IN_SP, NULL_PTR);
3293 builtin_function ("__builtin_dwarf_fp_regnum",
3294 build_function_type (unsigned_type_node, endlink),
3295 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3296 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3297 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3298 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3299 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3300 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3301 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3302 builtin_function ("__builtin_set_return_addr_reg",
3303 build_function_type (void_type_node,
3304 tree_cons (NULL_TREE,
3307 BUILT_IN_SET_RETURN_ADDR_REG, NULL_PTR);
3308 builtin_function ("__builtin_eh_stub_old", ptr_ftype_void,
3309 BUILT_IN_EH_STUB_OLD, NULL_PTR);
3310 builtin_function ("__builtin_eh_stub", ptr_ftype_void,
3311 BUILT_IN_EH_STUB, NULL_PTR);
3313 ("__builtin_set_eh_regs",
3314 build_function_type (void_type_node,
3315 tree_cons (NULL_TREE, ptr_type_node,
3316 tree_cons (NULL_TREE,
3317 type_for_mode (ptr_mode, 0),
3319 BUILT_IN_SET_EH_REGS, NULL_PTR);
3321 builtin_function ("__builtin_alloca",
3322 build_function_type (ptr_type_node,
3323 tree_cons (NULL_TREE,
3326 BUILT_IN_ALLOCA, "alloca");
3327 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3328 /* Define alloca, ffs as builtins.
3329 Declare _exit just to mark it as volatile. */
3330 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3332 temp = builtin_function ("alloca",
3333 build_function_type (ptr_type_node,
3334 tree_cons (NULL_TREE,
3337 BUILT_IN_ALLOCA, NULL_PTR);
3338 /* Suppress error if redefined as a non-function. */
3339 DECL_BUILT_IN_NONANSI (temp) = 1;
3340 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3341 /* Suppress error if redefined as a non-function. */
3342 DECL_BUILT_IN_NONANSI (temp) = 1;
3343 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3345 TREE_THIS_VOLATILE (temp) = 1;
3346 TREE_SIDE_EFFECTS (temp) = 1;
3347 /* Suppress error if redefined as a non-function. */
3348 DECL_BUILT_IN_NONANSI (temp) = 1;
3351 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3352 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3354 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3356 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3358 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3360 builtin_function ("__builtin_saveregs",
3361 build_function_type (ptr_type_node, NULL_TREE),
3362 BUILT_IN_SAVEREGS, NULL_PTR);
3363 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3365 builtin_function ("__builtin_varargs",
3366 build_function_type (ptr_type_node,
3367 tree_cons (NULL_TREE,
3370 BUILT_IN_VARARGS, NULL_PTR);
3372 builtin_function ("__builtin_classify_type", default_function_type,
3373 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3374 builtin_function ("__builtin_next_arg",
3375 build_function_type (ptr_type_node, NULL_TREE),
3376 BUILT_IN_NEXT_ARG, NULL_PTR);
3377 builtin_function ("__builtin_args_info",
3378 build_function_type (integer_type_node,
3379 tree_cons (NULL_TREE,
3382 BUILT_IN_ARGS_INFO, NULL_PTR);
3384 /* Untyped call and return. */
3385 builtin_function ("__builtin_apply_args",
3386 build_function_type (ptr_type_node, NULL_TREE),
3387 BUILT_IN_APPLY_ARGS, NULL_PTR);
3389 temp = tree_cons (NULL_TREE,
3390 build_pointer_type (build_function_type (void_type_node,
3392 tree_cons (NULL_TREE,
3394 tree_cons (NULL_TREE,
3397 builtin_function ("__builtin_apply",
3398 build_function_type (ptr_type_node, temp),
3399 BUILT_IN_APPLY, NULL_PTR);
3400 builtin_function ("__builtin_return",
3401 build_function_type (void_type_node,
3402 tree_cons (NULL_TREE,
3405 BUILT_IN_RETURN, NULL_PTR);
3407 /* Currently under experimentation. */
3408 builtin_function ("__builtin_memcpy", memcpy_ftype,
3409 BUILT_IN_MEMCPY, "memcpy");
3410 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3411 BUILT_IN_MEMCMP, "memcmp");
3412 builtin_function ("__builtin_memset", memset_ftype,
3413 BUILT_IN_MEMSET, "memset");
3414 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3415 BUILT_IN_STRCMP, "strcmp");
3416 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3417 BUILT_IN_STRCPY, "strcpy");
3418 builtin_function ("__builtin_strlen", strlen_ftype,
3419 BUILT_IN_STRLEN, "strlen");
3420 builtin_function ("__builtin_sqrtf", float_ftype_float,
3421 BUILT_IN_FSQRT, "sqrtf");
3422 builtin_function ("__builtin_fsqrt", double_ftype_double,
3423 BUILT_IN_FSQRT, "sqrt");
3424 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3425 BUILT_IN_FSQRT, "sqrtl");
3426 builtin_function ("__builtin_sinf", float_ftype_float,
3427 BUILT_IN_SIN, "sinf");
3428 builtin_function ("__builtin_sin", double_ftype_double,
3429 BUILT_IN_SIN, "sin");
3430 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3431 BUILT_IN_SIN, "sinl");
3432 builtin_function ("__builtin_cosf", float_ftype_float,
3433 BUILT_IN_COS, "cosf");
3434 builtin_function ("__builtin_cos", double_ftype_double,
3435 BUILT_IN_COS, "cos");
3436 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3437 BUILT_IN_COS, "cosl");
3438 builtin_function ("__builtin_setjmp",
3439 build_function_type (integer_type_node,
3440 tree_cons (NULL_TREE,
3441 ptr_type_node, endlink)),
3442 BUILT_IN_SETJMP, NULL_PTR);
3443 builtin_function ("__builtin_longjmp",
3446 tree_cons (NULL, ptr_type_node,
3447 tree_cons (NULL_TREE,
3450 BUILT_IN_LONGJMP, NULL_PTR);
3451 builtin_function ("__builtin_trap",
3452 build_function_type (void_type_node, endlink),
3453 BUILT_IN_TRAP, NULL_PTR);
3455 /* In an ANSI C program, it is okay to supply built-in meanings
3456 for these functions, since applications cannot validly use them
3457 with any other meaning.
3458 However, honor the -fno-builtin option. */
3459 if (!flag_no_builtin)
3461 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3462 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3463 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3464 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3466 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3467 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3468 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3470 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3471 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3473 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3475 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3476 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3477 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3478 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3480 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3481 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3482 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3483 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3484 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3485 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3487 /* Declare these functions volatile
3488 to avoid spurious "control drops through" warnings. */
3489 /* Don't specify the argument types, to avoid errors
3490 from certain code which isn't valid in ANSI but which exists. */
3491 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3493 TREE_THIS_VOLATILE (temp) = 1;
3494 TREE_SIDE_EFFECTS (temp) = 1;
3495 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3496 TREE_THIS_VOLATILE (temp) = 1;
3497 TREE_SIDE_EFFECTS (temp) = 1;
3501 /* Support for these has not been written in either expand_builtin
3502 or build_function_call. */
3503 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3504 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3505 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3507 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3509 builtin_function ("__builtin_fmod", double_ftype_double_double,
3510 BUILT_IN_FMOD, NULL_PTR);
3511 builtin_function ("__builtin_frem", double_ftype_double_double,
3512 BUILT_IN_FREM, NULL_PTR);
3513 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3515 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3519 pedantic_lvalues = pedantic;
3521 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3522 declare_function_name ();
3524 start_identifier_warnings ();
3526 /* Prepare to check format strings against argument lists. */
3527 init_function_format_info ();
3531 incomplete_decl_finalize_hook = finish_incomplete_decl;
3533 lang_get_alias_set = &c_get_alias_set;
3536 /* Return a definition for a builtin function named NAME and whose data type
3537 is TYPE. TYPE should be a function type with argument types.
3538 FUNCTION_CODE tells later passes how to compile calls to this function.
3539 See tree.h for its possible values.
3541 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3542 the name to be called if we can't opencode the function. */
3545 builtin_function (name, type, function_code, library_name)
3548 enum built_in_function function_code;
3551 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3552 DECL_EXTERNAL (decl) = 1;
3553 TREE_PUBLIC (decl) = 1;
3554 /* If -traditional, permit redefining a builtin function any way you like.
3555 (Though really, if the program redefines these functions,
3556 it probably won't work right unless compiled with -fno-builtin.) */
3557 if (flag_traditional && name[0] != '_')
3558 DECL_BUILT_IN_NONANSI (decl) = 1;
3560 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3561 make_decl_rtl (decl, NULL_PTR, 1);
3563 if (function_code != NOT_BUILT_IN)
3565 DECL_BUILT_IN (decl) = 1;
3566 DECL_FUNCTION_CODE (decl) = function_code;
3568 /* Warn if a function in the namespace for users
3569 is used without an occasion to consider it declared. */
3570 if (name[0] != '_' || name[1] != '_')
3571 C_DECL_ANTICIPATED (decl) = 1;
3576 /* Called when a declaration is seen that contains no names to declare.
3577 If its type is a reference to a structure, union or enum inherited
3578 from a containing scope, shadow that tag name for the current scope
3579 with a forward reference.
3580 If its type defines a new named structure or union
3581 or defines an enum, it is valid but we need not do anything here.
3582 Otherwise, it is an error. */
3585 shadow_tag (declspecs)
3588 shadow_tag_warned (declspecs, 0);
3592 shadow_tag_warned (declspecs, warned)
3595 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3602 pending_invalid_xref = 0;
3604 /* Remove the attributes from declspecs, since they will confuse the
3606 split_specs_attrs (declspecs, &specs, &attrs);
3608 for (link = specs; link; link = TREE_CHAIN (link))
3610 register tree value = TREE_VALUE (link);
3611 register enum tree_code code = TREE_CODE (value);
3613 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3614 /* Used to test also that TYPE_SIZE (value) != 0.
3615 That caused warning for `struct foo;' at top level in the file. */
3617 register tree name = lookup_tag_reverse (value);
3624 if (warned != 1 && code != ENUMERAL_TYPE)
3625 /* Empty unnamed enum OK */
3627 pedwarn ("unnamed struct/union that defines no instances");
3633 t = lookup_tag (code, name, current_binding_level, 1);
3637 t = make_node (code);
3644 if (!warned && ! in_system_header)
3646 warning ("useless keyword or type name in empty declaration");
3653 error ("two types specified in one empty declaration");
3658 pedwarn ("empty declaration");
3662 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3665 groktypename (typename)
3668 if (TREE_CODE (typename) != TREE_LIST)
3670 return grokdeclarator (TREE_VALUE (typename),
3671 TREE_PURPOSE (typename),
3675 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3678 groktypename_in_parm_context (typename)
3681 if (TREE_CODE (typename) != TREE_LIST)
3683 return grokdeclarator (TREE_VALUE (typename),
3684 TREE_PURPOSE (typename),
3688 /* Decode a declarator in an ordinary declaration or data definition.
3689 This is called as soon as the type information and variable name
3690 have been parsed, before parsing the initializer if any.
3691 Here we create the ..._DECL node, fill in its type,
3692 and put it on the list of decls for the current context.
3693 The ..._DECL node is returned as the value.
3695 Exception: for arrays where the length is not specified,
3696 the type is left null, to be filled in by `finish_decl'.
3698 Function definitions do not come here; they go to start_function
3699 instead. However, external and forward declarations of functions
3700 do go through here. Structure field declarations are done by
3701 grokfield and not through here. */
3703 /* Set this to zero to debug not using the temporary obstack
3704 to parse initializers. */
3705 int debug_temp_inits = 1;
3708 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3709 tree declarator, declspecs;
3711 tree attributes, prefix_attributes;
3713 register tree decl = grokdeclarator (declarator, declspecs,
3714 NORMAL, initialized);
3716 int init_written = initialized;
3718 /* The corresponding pop_obstacks is in finish_decl. */
3719 push_obstacks_nochange ();
3721 if (warn_main && TREE_CODE (decl) != FUNCTION_DECL
3722 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3723 warning_with_decl (decl, "`%s' is usually a function");
3726 /* Is it valid for this decl to have an initializer at all?
3727 If not, set INITIALIZED to zero, which will indirectly
3728 tell `finish_decl' to ignore the initializer once it is parsed. */
3729 switch (TREE_CODE (decl))
3732 /* typedef foo = bar means give foo the same type as bar.
3733 We haven't parsed bar yet, so `finish_decl' will fix that up.
3734 Any other case of an initialization in a TYPE_DECL is an error. */
3735 if (pedantic || list_length (declspecs) > 1)
3737 error ("typedef `%s' is initialized",
3738 IDENTIFIER_POINTER (DECL_NAME (decl)));
3744 error ("function `%s' is initialized like a variable",
3745 IDENTIFIER_POINTER (DECL_NAME (decl)));
3750 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3751 error ("parameter `%s' is initialized",
3752 IDENTIFIER_POINTER (DECL_NAME (decl)));
3757 /* Don't allow initializations for incomplete types
3758 except for arrays which might be completed by the initialization. */
3759 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3761 /* A complete type is ok if size is fixed. */
3763 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3764 || C_DECL_VARIABLE_SIZE (decl))
3766 error ("variable-sized object may not be initialized");
3770 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3772 error ("variable `%s' has initializer but incomplete type",
3773 IDENTIFIER_POINTER (DECL_NAME (decl)));
3776 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3778 error ("elements of array `%s' have incomplete type",
3779 IDENTIFIER_POINTER (DECL_NAME (decl)));
3786 #if 0 /* Seems redundant with grokdeclarator. */
3787 if (current_binding_level != global_binding_level
3788 && DECL_EXTERNAL (decl)
3789 && TREE_CODE (decl) != FUNCTION_DECL)
3790 warning ("declaration of `%s' has `extern' and is initialized",
3791 IDENTIFIER_POINTER (DECL_NAME (decl)));
3793 DECL_EXTERNAL (decl) = 0;
3794 if (current_binding_level == global_binding_level)
3795 TREE_STATIC (decl) = 1;
3797 /* Tell `pushdecl' this is an initialized decl
3798 even though we don't yet have the initializer expression.
3799 Also tell `finish_decl' it may store the real initializer. */
3800 DECL_INITIAL (decl) = error_mark_node;
3803 /* If this is a function declaration, write a record describing it to the
3804 prototypes file (if requested). */
3806 if (TREE_CODE (decl) == FUNCTION_DECL)
3807 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3809 /* ANSI specifies that a tentative definition which is not merged with
3810 a non-tentative definition behaves exactly like a definition with an
3811 initializer equal to zero. (Section 3.7.2)
3812 -fno-common gives strict ANSI behavior. Usually you don't want it.
3813 This matters only for variables with external linkage. */
3814 if (! flag_no_common || ! TREE_PUBLIC (decl))
3815 DECL_COMMON (decl) = 1;
3817 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3818 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3821 /* Set attributes here so if duplicate decl, will have proper attributes. */
3822 decl_attributes (decl, attributes, prefix_attributes);
3824 /* Add this decl to the current binding level.
3825 TEM may equal DECL or it may be a previous decl of the same name. */
3826 tem = pushdecl (decl);
3828 /* For a local variable, define the RTL now. */
3829 if (current_binding_level != global_binding_level
3830 /* But not if this is a duplicate decl
3831 and we preserved the rtl from the previous one
3832 (which may or may not happen). */
3833 && DECL_RTL (tem) == 0)
3835 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3837 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3838 && DECL_INITIAL (tem) != 0)
3844 /* When parsing and digesting the initializer,
3845 use temporary storage. Do this even if we will ignore the value. */
3846 if (current_binding_level == global_binding_level && debug_temp_inits)
3847 temporary_allocation ();
3853 /* Finish processing of a declaration;
3854 install its initial value.
3855 If the length of an array type is not known before,
3856 it must be determined now, from the initial value, or it is an error. */
3859 finish_decl (decl, init, asmspec_tree)
3863 register tree type = TREE_TYPE (decl);
3864 int was_incomplete = (DECL_SIZE (decl) == 0);
3865 int temporary = allocation_temporary_p ();
3868 /* If a name was specified, get the string. */
3870 asmspec = TREE_STRING_POINTER (asmspec_tree);
3872 /* If `start_decl' didn't like having an initialization, ignore it now. */
3874 if (init != 0 && DECL_INITIAL (decl) == 0)
3876 /* Don't crash if parm is initialized. */
3877 if (TREE_CODE (decl) == PARM_DECL)
3880 if (ITERATOR_P (decl))
3883 error_with_decl (decl, "iterator has no initial value");
3885 init = save_expr (init);
3890 if (TREE_CODE (decl) != TYPE_DECL)
3891 store_init_value (decl, init);
3894 /* typedef foo = bar; store the type of bar as the type of foo. */
3895 TREE_TYPE (decl) = TREE_TYPE (init);
3896 DECL_INITIAL (decl) = init = 0;
3900 /* Pop back to the obstack that is current for this binding level.
3901 This is because MAXINDEX, rtl, etc. to be made below
3902 must go in the permanent obstack. But don't discard the
3903 temporary data yet. */
3905 #if 0 /* pop_obstacks was near the end; this is what was here. */
3906 if (current_binding_level == global_binding_level && temporary)
3907 end_temporary_allocation ();
3910 /* Deduce size of array from initialization, if not already known */
3912 if (TREE_CODE (type) == ARRAY_TYPE
3913 && TYPE_DOMAIN (type) == 0
3914 && TREE_CODE (decl) != TYPE_DECL)
3917 = (TREE_STATIC (decl)
3918 /* Even if pedantic, an external linkage array
3919 may have incomplete type at first. */
3920 ? pedantic && !TREE_PUBLIC (decl)
3921 : !DECL_EXTERNAL (decl));
3923 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3925 /* Get the completed type made by complete_array_type. */
3926 type = TREE_TYPE (decl);
3929 error_with_decl (decl, "initializer fails to determine size of `%s'");
3934 error_with_decl (decl, "array size missing in `%s'");
3935 /* If a `static' var's size isn't known,
3936 make it extern as well as static, so it does not get
3938 If it is not `static', then do not mark extern;
3939 finish_incomplete_decl will give it a default size
3940 and it will get allocated. */
3941 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3942 DECL_EXTERNAL (decl) = 1;
3945 /* TYPE_MAX_VALUE is always one less than the number of elements
3946 in the array, because we start counting at zero. Therefore,
3947 warn only if the value is less than zero. */
3948 if (pedantic && TYPE_DOMAIN (type) != 0
3949 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3950 error_with_decl (decl, "zero or negative size array `%s'");
3952 layout_decl (decl, 0);
3955 if (TREE_CODE (decl) == VAR_DECL)
3957 if (DECL_SIZE (decl) == 0
3958 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3959 layout_decl (decl, 0);
3961 if (DECL_SIZE (decl) == 0
3962 && (TREE_STATIC (decl)
3964 /* A static variable with an incomplete type
3965 is an error if it is initialized.
3966 Also if it is not file scope.
3967 Otherwise, let it through, but if it is not `extern'
3968 then it may cause an error message later. */
3969 /* A duplicate_decls call could have changed an extern
3970 declaration into a file scope one. This can be detected
3971 by TREE_ASM_WRITTEN being set. */
3972 (DECL_INITIAL (decl) != 0
3973 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3975 /* An automatic variable with an incomplete type
3977 !DECL_EXTERNAL (decl)))
3979 error_with_decl (decl, "storage size of `%s' isn't known");
3980 TREE_TYPE (decl) = error_mark_node;
3983 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3984 && DECL_SIZE (decl) != 0)
3986 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3987 constant_expression_warning (DECL_SIZE (decl));
3989 error_with_decl (decl, "storage size of `%s' isn't constant");
3992 if (TREE_USED (type))
3993 TREE_USED (decl) = 1;
3996 /* If this is a function and an assembler name is specified, it isn't
3997 builtin any more. Also reset DECL_RTL so we can give it its new
3999 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4001 DECL_BUILT_IN (decl) = 0;
4002 DECL_RTL (decl) = 0;
4005 /* Output the assembler code and/or RTL code for variables and functions,
4006 unless the type is an undefined structure or union.
4007 If not, it will get done when the type is completed. */
4009 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4011 if ((flag_traditional || TREE_PERMANENT (decl))
4012 && allocation_temporary_p ())
4014 push_obstacks_nochange ();
4015 end_temporary_allocation ();
4016 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4017 maybe_objc_check_decl (decl);
4018 rest_of_decl_compilation (decl, asmspec,
4019 (DECL_CONTEXT (decl) == 0
4020 || TREE_ASM_WRITTEN (decl)),
4026 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4027 maybe_objc_check_decl (decl);
4028 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4031 if (DECL_CONTEXT (decl) != 0)
4033 /* Recompute the RTL of a local array now
4034 if it used to be an incomplete type. */
4036 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4038 /* If we used it already as memory, it must stay in memory. */
4039 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4040 /* If it's still incomplete now, no init will save it. */
4041 if (DECL_SIZE (decl) == 0)
4042 DECL_INITIAL (decl) = 0;
4045 /* Compute and store the initial value. */
4046 if (TREE_CODE (decl) != FUNCTION_DECL)
4047 expand_decl_init (decl);
4051 if (TREE_CODE (decl) == TYPE_DECL)
4053 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4054 maybe_objc_check_decl (decl);
4055 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4059 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4060 /* This test used to include TREE_PERMANENT, however, we have the same
4061 problem with initializers at the function level. Such initializers get
4062 saved until the end of the function on the momentary_obstack. */
4063 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4065 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4066 space with DECL_ARG_TYPE. */
4067 && TREE_CODE (decl) != PARM_DECL)
4069 /* We need to remember that this array HAD an initialization,
4070 but discard the actual temporary nodes,
4071 since we can't have a permanent node keep pointing to them. */
4072 /* We make an exception for inline functions, since it's
4073 normal for a local extern redeclaration of an inline function
4074 to have a copy of the top-level decl's DECL_INLINE. */
4075 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4077 /* If this is a const variable, then preserve the
4078 initializer instead of discarding it so that we can optimize
4079 references to it. */
4080 /* This test used to include TREE_STATIC, but this won't be set
4081 for function level initializers. */
4082 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4084 preserve_initializer ();
4085 /* Hack? Set the permanent bit for something that is permanent,
4086 but not on the permanent obstack, so as to convince
4087 output_constant_def to make its rtl on the permanent
4089 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4091 /* The initializer and DECL must have the same (or equivalent
4092 types), but if the initializer is a STRING_CST, its type
4093 might not be on the right obstack, so copy the type
4095 TREE_TYPE (DECL_INITIAL (decl)) = type;
4098 DECL_INITIAL (decl) = error_mark_node;
4102 /* If requested, warn about definitions of large data objects. */
4104 if (warn_larger_than
4105 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4106 && !DECL_EXTERNAL (decl))
4108 register tree decl_size = DECL_SIZE (decl);
4110 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4112 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4114 if (units > larger_than_size)
4115 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4120 /* Resume permanent allocation, if not within a function. */
4121 /* The corresponding push_obstacks_nochange is in start_decl,
4122 and in push_parm_decl and in grokfield. */
4126 /* If we have gone back from temporary to permanent allocation,
4127 actually free the temporary space that we no longer need. */
4128 if (temporary && !allocation_temporary_p ())
4129 permanent_allocation (0);
4131 /* At the end of a declaration, throw away any variable type sizes
4132 of types defined inside that declaration. There is no use
4133 computing them in the following function definition. */
4134 if (current_binding_level == global_binding_level)
4135 get_pending_sizes ();
4138 /* If DECL has a cleanup, build and return that cleanup here.
4139 This is a callback called by expand_expr. */
4142 maybe_build_cleanup (decl)
4143 tree decl ATTRIBUTE_UNUSED;
4145 /* There are no cleanups in C. */
4149 /* Given a parsed parameter declaration,
4150 decode it into a PARM_DECL and push that on the current binding level.
4151 Also, for the sake of forward parm decls,
4152 record the given order of parms in `parm_order'. */
4155 push_parm_decl (parm)
4159 int old_immediate_size_expand = immediate_size_expand;
4160 /* Don't try computing parm sizes now -- wait till fn is called. */
4161 immediate_size_expand = 0;
4163 /* The corresponding pop_obstacks is in finish_decl. */
4164 push_obstacks_nochange ();
4166 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4167 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4168 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4169 TREE_PURPOSE (TREE_VALUE (parm)));
4172 if (DECL_NAME (decl))
4175 olddecl = lookup_name (DECL_NAME (decl));
4176 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4177 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4181 decl = pushdecl (decl);
4183 immediate_size_expand = old_immediate_size_expand;
4185 current_binding_level->parm_order
4186 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4188 /* Add this decl to the current binding level. */
4189 finish_decl (decl, NULL_TREE, NULL_TREE);
4192 /* Clear the given order of parms in `parm_order'.
4193 Used at start of parm list,
4194 and also at semicolon terminating forward decls. */
4199 current_binding_level->parm_order = NULL_TREE;
4202 /* Make TYPE a complete type based on INITIAL_VALUE.
4203 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4204 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4207 complete_array_type (type, initial_value, do_default)
4212 register tree maxindex = NULL_TREE;
4217 /* Note MAXINDEX is really the maximum index,
4218 one less than the size. */
4219 if (TREE_CODE (initial_value) == STRING_CST)
4222 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4223 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4226 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4228 tree elts = CONSTRUCTOR_ELTS (initial_value);
4229 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4230 for (; elts; elts = TREE_CHAIN (elts))
4232 if (TREE_PURPOSE (elts))
4233 maxindex = TREE_PURPOSE (elts);
4235 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4237 maxindex = copy_node (maxindex);
4241 /* Make an error message unless that happened already. */
4242 if (initial_value != error_mark_node)
4245 /* Prevent further error messages. */
4246 maxindex = build_int_2 (0, 0);
4253 maxindex = build_int_2 (0, 0);
4259 TYPE_DOMAIN (type) = build_index_type (maxindex);
4260 if (!TREE_TYPE (maxindex))
4261 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4264 /* Lay out the type now that we can get the real answer. */
4271 /* Given declspecs and a declarator,
4272 determine the name and type of the object declared
4273 and construct a ..._DECL node for it.
4274 (In one case we can return a ..._TYPE node instead.
4275 For invalid input we sometimes return 0.)
4277 DECLSPECS is a chain of tree_list nodes whose value fields
4278 are the storage classes and type specifiers.
4280 DECL_CONTEXT says which syntactic context this declaration is in:
4281 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4282 FUNCDEF for a function definition. Like NORMAL but a few different
4283 error messages in each case. Return value may be zero meaning
4284 this definition is too screwy to try to parse.
4285 PARM for a parameter declaration (either within a function prototype
4286 or before a function body). Make a PARM_DECL, or return void_type_node.
4287 TYPENAME if for a typename (in a cast or sizeof).
4288 Don't make a DECL node; just return the ..._TYPE node.
4289 FIELD for a struct or union field; make a FIELD_DECL.
4290 BITFIELD for a field with specified width.
4291 INITIALIZED is 1 if the decl has an initializer.
4293 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4294 It may also be so in the PARM case, for a prototype where the
4295 argument type is specified but not the name.
4297 This function is where the complicated C meanings of `static'
4298 and `extern' are interpreted. */
4301 grokdeclarator (declarator, declspecs, decl_context, initialized)
4304 enum decl_context decl_context;
4309 tree type = NULL_TREE;
4314 int explicit_int = 0;
4315 int explicit_char = 0;
4316 int defaulted_int = 0;
4317 tree typedef_decl = 0;
4319 tree typedef_type = 0;
4320 int funcdef_flag = 0;
4321 enum tree_code innermost_code = ERROR_MARK;
4323 int size_varies = 0;
4324 tree decl_machine_attr = NULL_TREE;
4326 if (decl_context == BITFIELD)
4327 bitfield = 1, decl_context = FIELD;
4329 if (decl_context == FUNCDEF)
4330 funcdef_flag = 1, decl_context = NORMAL;
4332 push_obstacks_nochange ();
4334 if (flag_traditional && allocation_temporary_p ())
4335 end_temporary_allocation ();
4337 /* Look inside a declarator for the name being declared
4338 and get it as a string, for an error message. */
4340 register tree decl = declarator;
4344 switch (TREE_CODE (decl))
4349 innermost_code = TREE_CODE (decl);
4350 decl = TREE_OPERAND (decl, 0);
4353 case IDENTIFIER_NODE:
4354 name = IDENTIFIER_POINTER (decl);
4365 /* A function definition's declarator must have the form of
4366 a function declarator. */
4368 if (funcdef_flag && innermost_code != CALL_EXPR)
4371 /* Anything declared one level down from the top level
4372 must be one of the parameters of a function
4373 (because the body is at least two levels down). */
4375 /* If this looks like a function definition, make it one,
4376 even if it occurs where parms are expected.
4377 Then store_parm_decls will reject it and not use it as a parm. */
4378 if (decl_context == NORMAL && !funcdef_flag
4379 && current_binding_level->parm_flag)
4380 decl_context = PARM;
4382 /* Look through the decl specs and record which ones appear.
4383 Some typespecs are defined as built-in typenames.
4384 Others, the ones that are modifiers of other types,
4385 are represented by bits in SPECBITS: set the bits for
4386 the modifiers that appear. Storage class keywords are also in SPECBITS.
4388 If there is a typedef name or a type, store the type in TYPE.
4389 This includes builtin typedefs such as `int'.
4391 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4392 and did not come from a user typedef.
4394 Set LONGLONG if `long' is mentioned twice. */
4396 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4399 register tree id = TREE_VALUE (spec);
4401 if (id == ridpointers[(int) RID_INT])
4403 if (id == ridpointers[(int) RID_CHAR])
4406 if (TREE_CODE (id) == IDENTIFIER_NODE)
4407 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4409 if (ridpointers[i] == id)
4411 if (i == (int) RID_LONG && specbits & (1<<i))
4414 error ("`long long long' is too long for GCC");
4417 if (pedantic && ! in_system_header && warn_long_long)
4418 pedwarn ("ANSI C does not support `long long'");
4422 else if (specbits & (1 << i))
4423 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4429 error ("two or more data types in declaration of `%s'", name);
4430 /* Actual typedefs come to us as TYPE_DECL nodes. */
4431 else if (TREE_CODE (id) == TYPE_DECL)
4433 type = TREE_TYPE (id);
4434 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4437 /* Built-in types come as identifiers. */
4438 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4440 register tree t = lookup_name (id);
4441 if (TREE_TYPE (t) == error_mark_node)
4443 else if (!t || TREE_CODE (t) != TYPE_DECL)
4444 error ("`%s' fails to be a typedef or built in type",
4445 IDENTIFIER_POINTER (id));
4448 type = TREE_TYPE (t);
4452 else if (TREE_CODE (id) != ERROR_MARK)
4458 typedef_type = type;
4460 size_varies = C_TYPE_VARIABLE_SIZE (type);
4462 /* No type at all: default to `int', and set DEFAULTED_INT
4463 because it was not a user-defined typedef. */
4467 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4468 | (1 << (int) RID_SIGNED)
4469 | (1 << (int) RID_UNSIGNED))))
4470 /* Don't warn about typedef foo = bar. */
4471 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4472 && ! (in_system_header && ! allocation_temporary_p ()))
4474 /* C9x will probably require a diagnostic here.
4475 For now, issue a warning if -Wreturn-type and this is a function,
4476 or if -Wimplicit; prefer the former warning since it is more
4478 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4479 warn_about_return_type = 1;
4480 else if (warn_implicit_int)
4481 warning ("type defaults to `int' in declaration of `%s'", name);
4485 type = integer_type_node;
4488 /* Now process the modifiers that were specified
4489 and check for invalid combinations. */
4491 /* Long double is a special combination. */
4493 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4494 && TYPE_MAIN_VARIANT (type) == double_type_node)
4496 specbits &= ~ (1 << (int) RID_LONG);
4497 type = long_double_type_node;
4500 /* Check all other uses of type modifiers. */
4502 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4503 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4507 if ((specbits & 1 << (int) RID_LONG)
4508 && (specbits & 1 << (int) RID_SHORT))
4509 error ("both long and short specified for `%s'", name);
4510 else if (((specbits & 1 << (int) RID_LONG)
4511 || (specbits & 1 << (int) RID_SHORT))
4513 error ("long or short specified with char for `%s'", name);
4514 else if (((specbits & 1 << (int) RID_LONG)
4515 || (specbits & 1 << (int) RID_SHORT))
4516 && TREE_CODE (type) == REAL_TYPE)
4518 static int already = 0;
4520 error ("long or short specified with floating type for `%s'", name);
4521 if (! already && ! pedantic)
4523 error ("the only valid combination is `long double'");
4527 else if ((specbits & 1 << (int) RID_SIGNED)
4528 && (specbits & 1 << (int) RID_UNSIGNED))
4529 error ("both signed and unsigned specified for `%s'", name);
4530 else if (TREE_CODE (type) != INTEGER_TYPE)
4531 error ("long, short, signed or unsigned invalid for `%s'", name);
4535 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4537 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4539 if (flag_pedantic_errors)
4544 /* Discard the type modifiers if they are invalid. */
4547 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4548 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4553 if ((specbits & (1 << (int) RID_COMPLEX))
4554 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4556 error ("complex invalid for `%s'", name);
4557 specbits &= ~ (1 << (int) RID_COMPLEX);
4560 /* Decide whether an integer type is signed or not.
4561 Optionally treat bitfields as signed by default. */
4562 if (specbits & 1 << (int) RID_UNSIGNED
4563 /* Traditionally, all bitfields are unsigned. */
4564 || (bitfield && flag_traditional
4565 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4566 || (bitfield && ! flag_signed_bitfields
4567 && (explicit_int || defaulted_int || explicit_char
4568 /* A typedef for plain `int' without `signed'
4569 can be controlled just like plain `int'. */
4570 || ! (typedef_decl != 0
4571 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4572 && TREE_CODE (type) != ENUMERAL_TYPE
4573 && !(specbits & 1 << (int) RID_SIGNED)))
4576 type = long_long_unsigned_type_node;
4577 else if (specbits & 1 << (int) RID_LONG)
4578 type = long_unsigned_type_node;
4579 else if (specbits & 1 << (int) RID_SHORT)
4580 type = short_unsigned_type_node;
4581 else if (type == char_type_node)
4582 type = unsigned_char_type_node;
4583 else if (typedef_decl)
4584 type = unsigned_type (type);
4586 type = unsigned_type_node;
4588 else if ((specbits & 1 << (int) RID_SIGNED)
4589 && type == char_type_node)
4590 type = signed_char_type_node;
4592 type = long_long_integer_type_node;
4593 else if (specbits & 1 << (int) RID_LONG)
4594 type = long_integer_type_node;
4595 else if (specbits & 1 << (int) RID_SHORT)
4596 type = short_integer_type_node;
4598 if (specbits & 1 << (int) RID_COMPLEX)
4600 /* If we just have "complex", it is equivalent to
4601 "complex double", but if any modifiers at all are specified it is
4602 the complex form of TYPE. E.g, "complex short" is
4603 "complex short int". */
4605 if (defaulted_int && ! longlong
4606 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4607 | (1 << (int) RID_SIGNED)
4608 | (1 << (int) RID_UNSIGNED))))
4609 type = complex_double_type_node;
4610 else if (type == integer_type_node)
4611 type = complex_integer_type_node;
4612 else if (type == float_type_node)
4613 type = complex_float_type_node;
4614 else if (type == double_type_node)
4615 type = complex_double_type_node;
4616 else if (type == long_double_type_node)
4617 type = complex_long_double_type_node;
4619 type = build_complex_type (type);
4622 /* Set CONSTP if this declaration is `const', whether by
4623 explicit specification or via a typedef.
4624 Likewise for VOLATILEP. */
4626 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4627 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4628 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4630 pedwarn ("duplicate `const'");
4632 pedwarn ("duplicate `volatile'");
4633 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4634 type = TYPE_MAIN_VARIANT (type);
4636 /* Warn if two storage classes are given. Default to `auto'. */
4641 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4642 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4643 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4644 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4645 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4646 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4648 /* Warn about storage classes that are invalid for certain
4649 kinds of declarations (parameters, typenames, etc.). */
4652 error ("multiple storage classes in declaration of `%s'", name);
4653 else if (funcdef_flag
4655 & ((1 << (int) RID_REGISTER)
4656 | (1 << (int) RID_AUTO)
4657 | (1 << (int) RID_TYPEDEF))))
4659 if (specbits & 1 << (int) RID_AUTO
4660 && (pedantic || current_binding_level == global_binding_level))
4661 pedwarn ("function definition declared `auto'");
4662 if (specbits & 1 << (int) RID_REGISTER)
4663 error ("function definition declared `register'");
4664 if (specbits & 1 << (int) RID_TYPEDEF)
4665 error ("function definition declared `typedef'");
4666 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4667 | (1 << (int) RID_AUTO));
4669 else if (decl_context != NORMAL && nclasses > 0)
4671 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4675 error ((decl_context == FIELD
4676 ? "storage class specified for structure field `%s'"
4677 : (decl_context == PARM
4678 ? "storage class specified for parameter `%s'"
4679 : "storage class specified for typename")),
4681 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4682 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4683 | (1 << (int) RID_EXTERN));
4686 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4688 /* `extern' with initialization is invalid if not at top level. */
4689 if (current_binding_level == global_binding_level)
4690 warning ("`%s' initialized and declared `extern'", name);
4692 error ("`%s' has both `extern' and initializer", name);
4694 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4695 && current_binding_level != global_binding_level)
4696 error ("nested function `%s' declared `extern'", name);
4697 else if (current_binding_level == global_binding_level
4698 && specbits & (1 << (int) RID_AUTO))
4699 error ("top-level declaration of `%s' specifies `auto'", name);
4700 else if ((specbits & 1 << (int) RID_ITERATOR)
4701 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4703 error ("iterator `%s' has derived type", name);
4704 type = error_mark_node;
4706 else if ((specbits & 1 << (int) RID_ITERATOR)
4707 && TREE_CODE (type) != INTEGER_TYPE)
4709 error ("iterator `%s' has noninteger type", name);
4710 type = error_mark_node;
4714 /* Now figure out the structure of the declarator proper.
4715 Descend through it, creating more complex types, until we reach
4716 the declared identifier (or NULL_TREE, in an absolute declarator). */
4718 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4720 if (type == error_mark_node)
4722 declarator = TREE_OPERAND (declarator, 0);
4726 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4727 an INDIRECT_REF (for *...),
4728 a CALL_EXPR (for ...(...)),
4729 an identifier (for the name being declared)
4730 or a null pointer (for the place in an absolute declarator
4731 where the name was omitted).
4732 For the last two cases, we have just exited the loop.
4734 At this point, TYPE is the type of elements of an array,
4735 or for a function to return, or for a pointer to point to.
4736 After this sequence of ifs, TYPE is the type of the
4737 array or function or pointer, and DECLARATOR has had its
4738 outermost layer removed. */
4740 if (TREE_CODE (declarator) == ARRAY_REF)
4742 register tree itype = NULL_TREE;
4743 register tree size = TREE_OPERAND (declarator, 1);
4744 /* An uninitialized decl with `extern' is a reference. */
4745 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4746 /* The index is a signed object `sizetype' bits wide. */
4747 tree index_type = signed_type (sizetype);
4749 declarator = TREE_OPERAND (declarator, 0);
4751 /* Check for some types that there cannot be arrays of. */
4753 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4755 error ("declaration of `%s' as array of voids", name);
4756 type = error_mark_node;
4759 if (TREE_CODE (type) == FUNCTION_TYPE)
4761 error ("declaration of `%s' as array of functions", name);
4762 type = error_mark_node;
4765 if (size == error_mark_node)
4766 type = error_mark_node;
4768 if (type == error_mark_node)
4771 /* If this is a block level extern, it must live past the end
4772 of the function so that we can check it against other extern
4773 declarations (IDENTIFIER_LIMBO_VALUE). */
4774 if (extern_ref && allocation_temporary_p ())
4775 end_temporary_allocation ();
4777 /* If size was specified, set ITYPE to a range-type for that size.
4778 Otherwise, ITYPE remains null. finish_decl may figure it out
4779 from an initial value. */
4783 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4784 STRIP_TYPE_NOPS (size);
4786 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4787 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4789 error ("size of array `%s' has non-integer type", name);
4790 size = integer_one_node;
4793 if (pedantic && integer_zerop (size))
4794 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4796 if (TREE_CODE (size) == INTEGER_CST)
4798 constant_expression_warning (size);
4799 if (tree_int_cst_sgn (size) < 0)
4801 error ("size of array `%s' is negative", name);
4802 size = integer_one_node;
4807 /* Make sure the array size remains visibly nonconstant
4808 even if it is (eg) a const variable with known value. */
4813 if (TREE_CONSTANT (size))
4814 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4816 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4820 /* Convert size to index_type, so that if it is a variable
4821 the computations will be done in the proper mode. */
4822 itype = fold (build (MINUS_EXPR, index_type,
4823 convert (index_type, size),
4824 convert (index_type, size_one_node)));
4826 /* If that overflowed, the array is too big.
4827 ??? While a size of INT_MAX+1 technically shouldn't cause
4828 an overflow (because we subtract 1), the overflow is recorded
4829 during the conversion to index_type, before the subtraction.
4830 Handling this case seems like an unnecessary complication. */
4831 if (TREE_OVERFLOW (itype))
4833 error ("size of array `%s' is too large", name);
4834 type = error_mark_node;
4839 itype = variable_size (itype);
4840 itype = build_index_type (itype);
4843 #if 0 /* This had bad results for pointers to arrays, as in
4844 union incomplete (*foo)[4]; */
4845 /* Complain about arrays of incomplete types, except in typedefs. */
4847 if (TYPE_SIZE (type) == 0
4848 /* Avoid multiple warnings for nested array types. */
4849 && TREE_CODE (type) != ARRAY_TYPE
4850 && !(specbits & (1 << (int) RID_TYPEDEF))
4851 && !C_TYPE_BEING_DEFINED (type))
4852 warning ("array type has incomplete element type");
4855 #if 0 /* We shouldn't have a function type here at all!
4856 Functions aren't allowed as array elements. */
4857 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4858 && (constp || volatilep))
4859 pedwarn ("ANSI C forbids const or volatile function types");
4862 /* Build the array type itself, then merge any constancy or
4863 volatility into the target type. We must do it in this order
4864 to ensure that the TYPE_MAIN_VARIANT field of the array type
4865 is set correctly. */
4867 type = build_array_type (type, itype);
4868 if (constp || volatilep)
4869 type = c_build_type_variant (type, constp, volatilep);
4871 #if 0 /* don't clear these; leave them set so that the array type
4872 or the variable is itself const or volatile. */
4878 C_TYPE_VARIABLE_SIZE (type) = 1;
4880 else if (TREE_CODE (declarator) == CALL_EXPR)
4882 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4883 || current_binding_level == global_binding_level);
4886 /* Declaring a function type.
4887 Make sure we have a valid type for the function to return. */
4888 if (type == error_mark_node)
4893 /* Warn about some types functions can't return. */
4895 if (TREE_CODE (type) == FUNCTION_TYPE)
4897 error ("`%s' declared as function returning a function", name);
4898 type = integer_type_node;
4900 if (TREE_CODE (type) == ARRAY_TYPE)
4902 error ("`%s' declared as function returning an array", name);
4903 type = integer_type_node;
4906 #ifndef TRADITIONAL_RETURN_FLOAT
4907 /* Traditionally, declaring return type float means double. */
4909 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4910 type = double_type_node;
4911 #endif /* TRADITIONAL_RETURN_FLOAT */
4913 /* If this is a block level extern, it must live past the end
4914 of the function so that we can check it against other extern
4915 declarations (IDENTIFIER_LIMBO_VALUE). */
4916 if (extern_ref && allocation_temporary_p ())
4917 end_temporary_allocation ();
4919 /* Construct the function type and go to the next
4920 inner layer of declarator. */
4922 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4924 /* Say it's a definition
4925 only for the CALL_EXPR
4926 closest to the identifier. */
4927 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4928 #if 0 /* This seems to be false. We turn off temporary allocation
4929 above in this function if -traditional.
4930 And this code caused inconsistent results with prototypes:
4931 callers would ignore them, and pass arguments wrong. */
4933 /* Omit the arg types if -traditional, since the arg types
4934 and the list links might not be permanent. */
4935 type = build_function_type (type,
4937 ? NULL_TREE : arg_types);
4939 /* ANSI seems to say that `const int foo ();'
4940 does not make the function foo const. */
4941 if (constp || volatilep)
4942 type = c_build_type_variant (type, constp, volatilep);
4946 type = build_function_type (type, arg_types);
4947 declarator = TREE_OPERAND (declarator, 0);
4949 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4950 the formal parameter list of this FUNCTION_TYPE to point to
4951 the FUNCTION_TYPE node itself. */
4956 for (link = last_function_parm_tags;
4958 link = TREE_CHAIN (link))
4959 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4962 else if (TREE_CODE (declarator) == INDIRECT_REF)
4964 /* Merge any constancy or volatility into the target type
4967 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4968 && (constp || volatilep))
4969 pedwarn ("ANSI C forbids const or volatile function types");
4970 if (constp || volatilep)
4971 type = c_build_type_variant (type, constp, volatilep);
4976 type = build_pointer_type (type);
4978 /* Process a list of type modifier keywords
4979 (such as const or volatile) that were given inside the `*'. */
4981 if (TREE_TYPE (declarator))
4983 register tree typemodlist;
4985 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4986 typemodlist = TREE_CHAIN (typemodlist))
4988 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4990 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4995 error ("invalid type modifier within pointer declarator");
4999 pedwarn ("duplicate `const'");
5001 pedwarn ("duplicate `volatile'");
5004 declarator = TREE_OPERAND (declarator, 0);
5011 /* Now TYPE has the actual type. */
5013 /* Did array size calculations overflow? */
5015 if (TREE_CODE (type) == ARRAY_TYPE
5017 && TREE_OVERFLOW (TYPE_SIZE (type)))
5018 error ("size of array `%s' is too large", name);
5020 /* If this is declaring a typedef name, return a TYPE_DECL. */
5022 if (specbits & (1 << (int) RID_TYPEDEF))
5025 /* Note that the grammar rejects storage classes
5026 in typenames, fields or parameters */
5027 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5028 && (constp || volatilep))
5029 pedwarn ("ANSI C forbids const or volatile function types");
5030 if (constp || volatilep)
5031 type = c_build_type_variant (type, constp, volatilep);
5032 decl = build_decl (TYPE_DECL, declarator, type);
5033 if ((specbits & (1 << (int) RID_SIGNED))
5034 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5035 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5040 /* Detect the case of an array type of unspecified size
5041 which came, as such, direct from a typedef name.
5042 We must copy the type, so that each identifier gets
5043 a distinct type, so that each identifier's size can be
5044 controlled separately by its own initializer. */
5046 if (type != 0 && typedef_type != 0
5047 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5048 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5050 type = build_array_type (TREE_TYPE (type), 0);
5052 C_TYPE_VARIABLE_SIZE (type) = 1;
5055 /* If this is a type name (such as, in a cast or sizeof),
5056 compute the type and return it now. */
5058 if (decl_context == TYPENAME)
5060 /* Note that the grammar rejects storage classes
5061 in typenames, fields or parameters */
5062 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5063 && (constp || volatilep))
5064 pedwarn ("ANSI C forbids const or volatile function types");
5065 if (constp || volatilep)
5066 type = c_build_type_variant (type, constp, volatilep);
5071 /* Aside from typedefs and type names (handle above),
5072 `void' at top level (not within pointer)
5073 is allowed only in public variables.
5074 We don't complain about parms either, but that is because
5075 a better error message can be made later. */
5077 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5078 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5079 && ((specbits & (1 << (int) RID_EXTERN))
5080 || (current_binding_level == global_binding_level
5082 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5084 error ("variable or field `%s' declared void", name);
5085 type = integer_type_node;
5088 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5089 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5094 if (decl_context == PARM)
5096 tree type_as_written = type;
5099 /* A parameter declared as an array of T is really a pointer to T.
5100 One declared as a function is really a pointer to a function. */
5102 if (TREE_CODE (type) == ARRAY_TYPE)
5104 /* Transfer const-ness of array into that of type pointed to. */
5105 type = TREE_TYPE (type);
5106 if (constp || volatilep)
5107 type = c_build_type_variant (type, constp, volatilep);
5108 type = build_pointer_type (type);
5109 volatilep = constp = 0;
5112 else if (TREE_CODE (type) == FUNCTION_TYPE)
5114 if (pedantic && (constp || volatilep))
5115 pedwarn ("ANSI C forbids const or volatile function types");
5116 if (constp || volatilep)
5117 type = c_build_type_variant (type, constp, volatilep);
5118 type = build_pointer_type (type);
5119 volatilep = constp = 0;
5122 decl = build_decl (PARM_DECL, declarator, type);
5124 C_DECL_VARIABLE_SIZE (decl) = 1;
5126 /* Compute the type actually passed in the parmlist,
5127 for the case where there is no prototype.
5128 (For example, shorts and chars are passed as ints.)
5129 When there is a prototype, this is overridden later. */
5131 DECL_ARG_TYPE (decl) = type;
5132 main_type = (type == error_mark_node
5134 : TYPE_MAIN_VARIANT (type));
5135 if (main_type == float_type_node)
5136 DECL_ARG_TYPE (decl) = double_type_node;
5137 /* Don't use TYPE_PRECISION to decide whether to promote,
5138 because we should convert short if it's the same size as int,
5139 but we should not convert long if it's the same size as int. */
5140 else if (TREE_CODE (main_type) != ERROR_MARK
5141 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5143 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5144 && TREE_UNSIGNED (type))
5145 DECL_ARG_TYPE (decl) = unsigned_type_node;
5147 DECL_ARG_TYPE (decl) = integer_type_node;
5150 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5152 else if (decl_context == FIELD)
5154 /* Structure field. It may not be a function. */
5156 if (TREE_CODE (type) == FUNCTION_TYPE)
5158 error ("field `%s' declared as a function", name);
5159 type = build_pointer_type (type);
5161 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5163 error ("field `%s' has incomplete type", name);
5164 type = error_mark_node;
5166 /* Move type qualifiers down to element of an array. */
5167 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5169 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5171 TYPE_DOMAIN (type));
5172 #if 0 /* Leave the field const or volatile as well. */
5173 constp = volatilep = 0;
5176 decl = build_decl (FIELD_DECL, declarator, type);
5178 C_DECL_VARIABLE_SIZE (decl) = 1;
5180 else if (TREE_CODE (type) == FUNCTION_TYPE)
5182 /* Every function declaration is "external"
5183 except for those which are inside a function body
5184 in which `auto' is used.
5185 That is a case not specified by ANSI C,
5186 and we use it for forward declarations for nested functions. */
5187 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5188 || current_binding_level == global_binding_level);
5190 if (specbits & (1 << (int) RID_AUTO)
5191 && (pedantic || current_binding_level == global_binding_level))
5192 pedwarn ("invalid storage class for function `%s'", name);
5193 if (specbits & (1 << (int) RID_REGISTER))
5194 error ("invalid storage class for function `%s'", name);
5195 /* Function declaration not at top level.
5196 Storage classes other than `extern' are not allowed
5197 and `extern' makes no difference. */
5198 if (current_binding_level != global_binding_level
5199 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5201 pedwarn ("invalid storage class for function `%s'", name);
5203 /* If this is a block level extern, it must live past the end
5204 of the function so that we can check it against other
5205 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5206 if (extern_ref && allocation_temporary_p ())
5207 end_temporary_allocation ();
5209 decl = build_decl (FUNCTION_DECL, declarator, type);
5210 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5212 if (pedantic && (constp || volatilep)
5213 && ! DECL_IN_SYSTEM_HEADER (decl))
5214 pedwarn ("ANSI C forbids const or volatile functions");
5217 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5218 && (TYPE_READONLY (TREE_TYPE (TREE_TYPE (decl)))
5219 || TYPE_VOLATILE (TREE_TYPE (TREE_TYPE (decl))))
5220 && ! DECL_IN_SYSTEM_HEADER (decl))
5221 pedwarn ("ANSI C forbids const or volatile void function return type");
5224 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5225 warning ("`noreturn' function returns non-void value");
5228 DECL_EXTERNAL (decl) = 1;
5229 /* Record absence of global scope for `static' or `auto'. */
5231 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5233 /* Record presence of `inline', if it is reasonable. */
5236 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5237 warning ("cannot inline function `main'");
5239 /* Assume that otherwise the function can be inlined. */
5240 DECL_INLINE (decl) = 1;
5242 if (specbits & (1 << (int) RID_EXTERN))
5243 current_extern_inline = 1;
5248 /* It's a variable. */
5249 /* An uninitialized decl with `extern' is a reference. */
5250 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5252 /* Move type qualifiers down to element of an array. */
5253 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
5255 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
5257 TYPE_DOMAIN (type));
5258 #if 0 /* Leave the variable const or volatile as well. */
5259 constp = volatilep = 0;
5263 /* If this is a block level extern, it must live past the end
5264 of the function so that we can check it against other
5265 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5266 if (extern_ref && allocation_temporary_p ())
5267 end_temporary_allocation ();
5269 decl = build_decl (VAR_DECL, declarator, type);
5271 C_DECL_VARIABLE_SIZE (decl) = 1;
5274 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5276 DECL_EXTERNAL (decl) = extern_ref;
5277 /* At top level, the presence of a `static' or `register' storage
5278 class specifier, or the absence of all storage class specifiers
5279 makes this declaration a definition (perhaps tentative). Also,
5280 the absence of both `static' and `register' makes it public. */
5281 if (current_binding_level == global_binding_level)
5285 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5286 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5288 /* Not at top level, only `static' makes a static definition. */
5291 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5292 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5295 if (specbits & 1 << (int) RID_ITERATOR)
5296 ITERATOR_P (decl) = 1;
5299 /* Record `register' declaration for warnings on &
5300 and in case doing stupid register allocation. */
5302 if (specbits & (1 << (int) RID_REGISTER))
5303 DECL_REGISTER (decl) = 1;
5305 /* Record constancy and volatility. */
5308 TREE_READONLY (decl) = 1;
5311 TREE_SIDE_EFFECTS (decl) = 1;
5312 TREE_THIS_VOLATILE (decl) = 1;
5314 /* If a type has volatile components, it should be stored in memory.
5315 Otherwise, the fact that those components are volatile
5316 will be ignored, and would even crash the compiler. */
5317 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5318 mark_addressable (decl);
5326 /* Decode the parameter-list info for a function type or function definition.
5327 The argument is the value returned by `get_parm_info' (or made in parse.y
5328 if there is an identifier list instead of a parameter decl list).
5329 These two functions are separate because when a function returns
5330 or receives functions then each is called multiple times but the order
5331 of calls is different. The last call to `grokparms' is always the one
5332 that contains the formal parameter names of a function definition.
5334 Store in `last_function_parms' a chain of the decls of parms.
5335 Also store in `last_function_parm_tags' a chain of the struct, union,
5336 and enum tags declared among the parms.
5338 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5340 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5341 a mere declaration. A nonempty identifier-list gets an error message
5342 when FUNCDEF_FLAG is zero. */
5345 grokparms (parms_info, funcdef_flag)
5349 tree first_parm = TREE_CHAIN (parms_info);
5351 last_function_parms = TREE_PURPOSE (parms_info);
5352 last_function_parm_tags = TREE_VALUE (parms_info);
5354 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5355 && !in_system_header)
5356 warning ("function declaration isn't a prototype");
5359 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5362 pedwarn ("parameter names (without types) in function declaration");
5364 last_function_parms = first_parm;
5371 /* We no longer test FUNCDEF_FLAG.
5372 If the arg types are incomplete in a declaration,
5373 they must include undefined tags.
5374 These tags can never be defined in the scope of the declaration,
5375 so the types can never be completed,
5376 and no call can be compiled successfully. */
5378 /* In a fcn definition, arg types must be complete. */
5381 for (parm = last_function_parms, typelt = first_parm;
5383 parm = TREE_CHAIN (parm))
5384 /* Skip over any enumeration constants declared here. */
5385 if (TREE_CODE (parm) == PARM_DECL)
5387 /* Barf if the parameter itself has an incomplete type. */
5388 tree type = TREE_VALUE (typelt);
5389 if (TYPE_SIZE (type) == 0)
5391 if (funcdef_flag && DECL_NAME (parm) != 0)
5392 error ("parameter `%s' has incomplete type",
5393 IDENTIFIER_POINTER (DECL_NAME (parm)));
5395 warning ("parameter has incomplete type");
5398 TREE_VALUE (typelt) = error_mark_node;
5399 TREE_TYPE (parm) = error_mark_node;
5402 #if 0 /* This has been replaced by parm_tags_warning
5403 which uses a more accurate criterion for what to warn about. */
5406 /* Now warn if is a pointer to an incomplete type. */
5407 while (TREE_CODE (type) == POINTER_TYPE
5408 || TREE_CODE (type) == REFERENCE_TYPE)
5409 type = TREE_TYPE (type);
5410 type = TYPE_MAIN_VARIANT (type);
5411 if (TYPE_SIZE (type) == 0)
5413 if (DECL_NAME (parm) != 0)
5414 warning ("parameter `%s' points to incomplete type",
5415 IDENTIFIER_POINTER (DECL_NAME (parm)));
5417 warning ("parameter points to incomplete type");
5421 typelt = TREE_CHAIN (typelt);
5424 /* Allocate the list of types the way we allocate a type. */
5425 if (first_parm && ! TREE_PERMANENT (first_parm))
5427 /* Construct a copy of the list of types
5428 on the saveable obstack. */
5430 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5431 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5433 return nreverse (result);
5436 /* The list we have is permanent already. */
5442 /* Return a tree_list node with info on a parameter list just parsed.
5443 The TREE_PURPOSE is a chain of decls of those parms.
5444 The TREE_VALUE is a list of structure, union and enum tags defined.
5445 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5446 This tree_list node is later fed to `grokparms'.
5448 VOID_AT_END nonzero means append `void' to the end of the type-list.
5449 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5452 get_parm_info (void_at_end)
5455 register tree decl, t;
5456 register tree types = 0;
5458 tree tags = gettags ();
5459 tree parms = getdecls ();
5461 tree order = current_binding_level->parm_order;
5463 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5464 if (void_at_end && parms != 0
5465 && TREE_CHAIN (parms) == 0
5466 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5467 && DECL_NAME (parms) == 0)
5470 storedecls (NULL_TREE);
5471 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5472 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5475 /* Extract enumerator values and other non-parms declared with the parms.
5476 Likewise any forward parm decls that didn't have real parm decls. */
5477 for (decl = parms; decl; )
5479 tree next = TREE_CHAIN (decl);
5481 if (TREE_CODE (decl) != PARM_DECL)
5483 TREE_CHAIN (decl) = new_parms;
5486 else if (TREE_ASM_WRITTEN (decl))
5488 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5489 TREE_CHAIN (decl) = new_parms;
5495 /* Put the parm decls back in the order they were in in the parm list. */
5496 for (t = order; t; t = TREE_CHAIN (t))
5499 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5501 TREE_CHAIN (TREE_VALUE (t)) = 0;
5504 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5507 /* Store the parmlist in the binding level since the old one
5508 is no longer a valid list. (We have changed the chain pointers.) */
5509 storedecls (new_parms);
5511 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5512 /* There may also be declarations for enumerators if an enumeration
5513 type is declared among the parms. Ignore them here. */
5514 if (TREE_CODE (decl) == PARM_DECL)
5516 /* Since there is a prototype,
5517 args are passed in their declared types. */
5518 tree type = TREE_TYPE (decl);
5519 DECL_ARG_TYPE (decl) = type;
5520 #ifdef PROMOTE_PROTOTYPES
5521 if ((TREE_CODE (type) == INTEGER_TYPE
5522 || TREE_CODE (type) == ENUMERAL_TYPE)
5523 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5524 DECL_ARG_TYPE (decl) = integer_type_node;
5527 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5528 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5529 && DECL_NAME (decl) == 0)
5531 error ("`void' in parameter list must be the entire list");
5537 return saveable_tree_cons (new_parms, tags,
5538 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5540 return saveable_tree_cons (new_parms, tags, nreverse (types));
5543 /* At end of parameter list, warn about any struct, union or enum tags
5544 defined within. Do so because these types cannot ever become complete. */
5547 parmlist_tags_warning ()
5552 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5554 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5555 /* An anonymous union parm type is meaningful as a GNU extension.
5556 So don't warn for that. */
5557 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5559 if (TREE_PURPOSE (elt) != 0)
5560 warning ("`%s %s' declared inside parameter list",
5561 (code == RECORD_TYPE ? "struct"
5562 : code == UNION_TYPE ? "union"
5564 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5566 warning ("anonymous %s declared inside parameter list",
5567 (code == RECORD_TYPE ? "struct"
5568 : code == UNION_TYPE ? "union"
5573 warning ("its scope is only this definition or declaration,");
5574 warning ("which is probably not what you want.");
5580 /* Get the struct, enum or union (CODE says which) with tag NAME.
5581 Define the tag as a forward-reference if it is not defined. */
5584 xref_tag (code, name)
5585 enum tree_code code;
5588 int temporary = allocation_temporary_p ();
5590 /* If a cross reference is requested, look up the type
5591 already defined for this tag and return it. */
5593 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5594 /* Even if this is the wrong type of tag, return what we found.
5595 There will be an error message anyway, from pending_xref_error.
5596 If we create an empty xref just for an invalid use of the type,
5597 the main result is to create lots of superfluous error messages. */
5601 push_obstacks_nochange ();
5603 if (current_binding_level == global_binding_level && temporary)
5604 end_temporary_allocation ();
5606 /* If no such tag is yet defined, create a forward-reference node
5607 and record it as the "definition".
5608 When a real declaration of this type is found,
5609 the forward-reference will be altered into a real type. */
5611 ref = make_node (code);
5612 if (code == ENUMERAL_TYPE)
5614 /* (In ANSI, Enums can be referred to only if already defined.) */
5616 pedwarn ("ANSI C forbids forward references to `enum' types");
5617 /* Give the type a default layout like unsigned int
5618 to avoid crashing if it does not get defined. */
5619 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5620 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5621 TREE_UNSIGNED (ref) = 1;
5622 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5623 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5624 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5627 pushtag (name, ref);
5634 /* Make sure that the tag NAME is defined *in the current binding level*
5635 at least as a forward reference.
5636 CODE says which kind of tag NAME ought to be.
5638 We also do a push_obstacks_nochange
5639 whose matching pop is in finish_struct. */
5642 start_struct (code, name)
5643 enum tree_code code;
5646 /* If there is already a tag defined at this binding level
5647 (as a forward reference), just return it. */
5649 register tree ref = 0;
5651 push_obstacks_nochange ();
5652 if (current_binding_level == global_binding_level)
5653 end_temporary_allocation ();
5656 ref = lookup_tag (code, name, current_binding_level, 1);
5657 if (ref && TREE_CODE (ref) == code)
5659 C_TYPE_BEING_DEFINED (ref) = 1;
5660 TYPE_PACKED (ref) = flag_pack_struct;
5661 if (TYPE_FIELDS (ref))
5662 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5663 : "redefinition of `struct %s'"),
5664 IDENTIFIER_POINTER (name));
5669 /* Otherwise create a forward-reference just so the tag is in scope. */
5671 ref = make_node (code);
5672 pushtag (name, ref);
5673 C_TYPE_BEING_DEFINED (ref) = 1;
5674 TYPE_PACKED (ref) = flag_pack_struct;
5678 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5679 of a structure component, returning a FIELD_DECL node.
5680 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5682 This is done during the parsing of the struct declaration.
5683 The FIELD_DECL nodes are chained together and the lot of them
5684 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5687 grokfield (filename, line, declarator, declspecs, width)
5690 tree declarator, declspecs, width;
5694 /* The corresponding pop_obstacks is in finish_decl. */
5695 push_obstacks_nochange ();
5697 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5699 finish_decl (value, NULL_TREE, NULL_TREE);
5700 DECL_INITIAL (value) = width;
5702 maybe_objc_check_decl (value);
5706 /* Function to help qsort sort FIELD_DECLs by name order. */
5709 field_decl_cmp (xp, yp)
5710 const GENERIC_PTR xp;
5711 const GENERIC_PTR yp;
5713 tree *x = (tree *)xp, *y = (tree *)yp;
5715 if (DECL_NAME (*x) == DECL_NAME (*y))
5717 if (DECL_NAME (*x) == NULL)
5719 if (DECL_NAME (*y) == NULL)
5721 if (DECL_NAME (*x) < DECL_NAME (*y))
5726 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5727 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5728 ATTRIBUTES are attributes to be applied to the structure.
5730 We also do a pop_obstacks to match the push in start_struct. */
5733 finish_struct (t, fieldlist, attributes)
5740 int toplevel = global_binding_level == current_binding_level;
5742 /* If this type was previously laid out as a forward reference,
5743 make sure we lay it out again. */
5747 decl_attributes (t, attributes, NULL_TREE);
5749 /* Nameless union parm types are useful as GCC extension. */
5750 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5751 /* Otherwise, warn about any struct or union def. in parmlist. */
5752 if (in_parm_level_p ())
5755 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5756 : "structure defined inside parms"));
5757 else if (! flag_traditional)
5758 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5759 : "structure defined inside parms"));
5762 old_momentary = suspend_momentary ();
5766 for (x = fieldlist; x; x = TREE_CHAIN (x))
5767 if (DECL_NAME (x) != 0)
5771 pedwarn ("%s has no %smembers",
5772 (TREE_CODE (t) == UNION_TYPE ? "union" : "structure"),
5773 (fieldlist ? "named " : ""));
5776 /* Install struct as DECL_CONTEXT of each field decl.
5777 Also process specified field sizes.
5778 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5779 The specified size is found in the DECL_INITIAL.
5780 Store 0 there, except for ": 0" fields (so we can find them
5781 and delete them, below). */
5783 for (x = fieldlist; x; x = TREE_CHAIN (x))
5785 DECL_CONTEXT (x) = t;
5786 DECL_PACKED (x) |= TYPE_PACKED (t);
5787 DECL_FIELD_SIZE (x) = 0;
5789 /* If any field is const, the structure type is pseudo-const. */
5790 if (TREE_READONLY (x))
5791 C_TYPE_FIELDS_READONLY (t) = 1;
5794 /* A field that is pseudo-const makes the structure likewise. */
5795 tree t1 = TREE_TYPE (x);
5796 while (TREE_CODE (t1) == ARRAY_TYPE)
5797 t1 = TREE_TYPE (t1);
5798 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5799 && C_TYPE_FIELDS_READONLY (t1))
5800 C_TYPE_FIELDS_READONLY (t) = 1;
5803 /* Any field that is volatile means variables of this type must be
5804 treated in some ways as volatile. */
5805 if (TREE_THIS_VOLATILE (x))
5806 C_TYPE_FIELDS_VOLATILE (t) = 1;
5808 /* Any field of nominal variable size implies structure is too. */
5809 if (C_DECL_VARIABLE_SIZE (x))
5810 C_TYPE_VARIABLE_SIZE (t) = 1;
5812 /* Detect invalid nested redefinition. */
5813 if (TREE_TYPE (x) == t)
5814 error ("nested redefinition of `%s'",
5815 IDENTIFIER_POINTER (TYPE_NAME (t)));
5817 /* Detect invalid bit-field size. */
5818 if (DECL_INITIAL (x))
5819 STRIP_NOPS (DECL_INITIAL (x));
5820 if (DECL_INITIAL (x))
5822 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5823 constant_expression_warning (DECL_INITIAL (x));
5826 error_with_decl (x, "bit-field `%s' width not an integer constant");
5827 DECL_INITIAL (x) = NULL;
5831 /* Detect invalid bit-field type. */
5832 if (DECL_INITIAL (x)
5833 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5834 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5836 error_with_decl (x, "bit-field `%s' has invalid type");
5837 DECL_INITIAL (x) = NULL;
5839 if (DECL_INITIAL (x) && pedantic
5840 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5841 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5842 /* Accept an enum that's equivalent to int or unsigned int. */
5843 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5844 && (TYPE_PRECISION (TREE_TYPE (x))
5845 == TYPE_PRECISION (integer_type_node))))
5846 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5848 /* Detect and ignore out of range field width. */
5849 if (DECL_INITIAL (x))
5851 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5853 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5855 DECL_INITIAL (x) = NULL;
5856 error_with_decl (x, "negative width in bit-field `%s'");
5858 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5859 || width > TYPE_PRECISION (TREE_TYPE (x)))
5861 DECL_INITIAL (x) = NULL;
5862 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5864 else if (width == 0 && DECL_NAME (x) != 0)
5866 error_with_decl (x, "zero width for bit-field `%s'");
5867 DECL_INITIAL (x) = NULL;
5871 /* Process valid field width. */
5872 if (DECL_INITIAL (x))
5874 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5876 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5877 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5878 TREE_UNSIGNED (TREE_TYPE (x)))
5879 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5880 TREE_UNSIGNED (TREE_TYPE (x)))))
5881 warning_with_decl (x, "`%s' is narrower than values of its type");
5883 DECL_FIELD_SIZE (x) = width;
5884 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5885 DECL_INITIAL (x) = NULL;
5889 /* field size 0 => force desired amount of alignment. */
5890 #ifdef EMPTY_FIELD_BOUNDARY
5891 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5893 #ifdef PCC_BITFIELD_TYPE_MATTERS
5894 if (PCC_BITFIELD_TYPE_MATTERS)
5895 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5896 TYPE_ALIGN (TREE_TYPE (x)));
5900 else if (TREE_TYPE (x) != error_mark_node)
5902 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5903 : TYPE_ALIGN (TREE_TYPE (x)));
5904 /* Non-bit-fields are aligned for their type, except packed
5905 fields which require only BITS_PER_UNIT alignment. */
5906 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5910 /* Now DECL_INITIAL is null on all members. */
5912 /* Delete all duplicate fields from the fieldlist */
5913 for (x = fieldlist; x && TREE_CHAIN (x);)
5914 /* Anonymous fields aren't duplicates. */
5915 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5919 register tree y = fieldlist;
5923 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5929 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5931 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5932 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5934 else x = TREE_CHAIN (x);
5937 /* Now we have the nearly final fieldlist. Record it,
5938 then lay out the structure or union (including the fields). */
5940 TYPE_FIELDS (t) = fieldlist;
5944 /* Delete all zero-width bit-fields from the front of the fieldlist */
5946 && DECL_INITIAL (fieldlist))
5947 fieldlist = TREE_CHAIN (fieldlist);
5948 /* Delete all such members from the rest of the fieldlist */
5949 for (x = fieldlist; x;)
5951 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5952 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5953 else x = TREE_CHAIN (x);
5956 /* Now we have the truly final field list.
5957 Store it in this type and in the variants. */
5959 TYPE_FIELDS (t) = fieldlist;
5961 /* If there are lots of fields, sort so we can look through them fast.
5962 We arbitrarily consider 16 or more elts to be "a lot". */
5966 for (x = fieldlist; x; x = TREE_CHAIN (x))
5977 len += list_length (x);
5978 /* Use the same allocation policy here that make_node uses, to
5979 ensure that this lives as long as the rest of the struct decl.
5980 All decls in an inline function need to be saved. */
5981 if (allocation_temporary_p ())
5982 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5984 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5986 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5987 TYPE_LANG_SPECIFIC (t)->len = len;
5989 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5991 for (x = fieldlist; x; x = TREE_CHAIN (x))
5992 field_array[len++] = x;
5994 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5998 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6000 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6001 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6002 TYPE_ALIGN (x) = TYPE_ALIGN (t);
6005 /* If this was supposed to be a transparent union, but we can't
6006 make it one, warn and turn off the flag. */
6007 if (TREE_CODE (t) == UNION_TYPE
6008 && TYPE_TRANSPARENT_UNION (t)
6009 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
6011 TYPE_TRANSPARENT_UNION (t) = 0;
6012 warning ("union cannot be made transparent");
6015 /* If this structure or union completes the type of any previous
6016 variable declaration, lay it out and output its rtl. */
6018 if (current_binding_level->n_incomplete != 0)
6021 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
6023 if (TREE_TYPE (decl) == t
6024 && TREE_CODE (decl) != TYPE_DECL)
6026 layout_decl (decl, 0);
6027 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6028 maybe_objc_check_decl (decl);
6029 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6032 --current_binding_level->n_incomplete;
6034 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6035 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6037 tree element = TREE_TYPE (decl);
6038 while (TREE_CODE (element) == ARRAY_TYPE)
6039 element = TREE_TYPE (element);
6041 layout_array_type (TREE_TYPE (decl));
6046 resume_momentary (old_momentary);
6048 /* Finish debugging output for this type. */
6049 rest_of_type_compilation (t, toplevel);
6051 /* The matching push is in start_struct. */
6057 /* Lay out the type T, and its element type, and so on. */
6060 layout_array_type (t)
6063 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6064 layout_array_type (TREE_TYPE (t));
6068 /* Begin compiling the definition of an enumeration type.
6069 NAME is its name (or null if anonymous).
6070 Returns the type object, as yet incomplete.
6071 Also records info about it so that build_enumerator
6072 may be used to declare the individual values as they are read. */
6078 register tree enumtype = 0;
6080 /* If this is the real definition for a previous forward reference,
6081 fill in the contents in the same object that used to be the
6082 forward reference. */
6085 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6087 /* The corresponding pop_obstacks is in finish_enum. */
6088 push_obstacks_nochange ();
6089 /* If these symbols and types are global, make them permanent. */
6090 if (current_binding_level == global_binding_level)
6091 end_temporary_allocation ();
6093 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6095 enumtype = make_node (ENUMERAL_TYPE);
6096 pushtag (name, enumtype);
6099 C_TYPE_BEING_DEFINED (enumtype) = 1;
6101 if (TYPE_VALUES (enumtype) != 0)
6103 /* This enum is a named one that has been declared already. */
6104 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6106 /* Completely replace its old definition.
6107 The old enumerators remain defined, however. */
6108 TYPE_VALUES (enumtype) = 0;
6111 enum_next_value = integer_zero_node;
6114 if (flag_short_enums)
6115 TYPE_PACKED (enumtype) = 1;
6120 /* After processing and defining all the values of an enumeration type,
6121 install their decls in the enumeration type and finish it off.
6122 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6123 and ATTRIBUTES are the specified attributes.
6124 Returns ENUMTYPE. */
6127 finish_enum (enumtype, values, attributes)
6132 register tree pair, tem;
6133 tree minnode = 0, maxnode = 0;
6134 int lowprec, highprec, precision;
6135 int toplevel = global_binding_level == current_binding_level;
6137 if (in_parm_level_p ())
6138 warning ("enum defined inside parms");
6140 decl_attributes (enumtype, attributes, NULL_TREE);
6142 /* Calculate the maximum value of any enumerator in this type. */
6144 if (values == error_mark_node)
6145 minnode = maxnode = integer_zero_node;
6147 for (pair = values; pair; pair = TREE_CHAIN (pair))
6149 tree value = TREE_VALUE (pair);
6151 minnode = maxnode = TREE_VALUE (pair);
6154 if (tree_int_cst_lt (maxnode, value))
6156 if (tree_int_cst_lt (value, minnode))
6161 TYPE_MIN_VALUE (enumtype) = minnode;
6162 TYPE_MAX_VALUE (enumtype) = maxnode;
6164 /* An enum can have some negative values; then it is signed. */
6165 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6167 /* Determine the precision this type needs. */
6169 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6170 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6171 precision = MAX (lowprec, highprec);
6173 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6175 tree narrowest = type_for_size (precision, 1);
6178 warning ("enumeration values exceed range of largest integer");
6179 narrowest = long_long_integer_type_node;
6182 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6185 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6187 TYPE_SIZE (enumtype) = 0;
6188 layout_type (enumtype);
6190 if (values != error_mark_node)
6192 /* Change the type of the enumerators to be the enum type.
6193 Formerly this was done only for enums that fit in an int,
6194 but the comment said it was done only for enums wider than int.
6195 It seems necessary to do this for wide enums,
6196 and best not to change what's done for ordinary narrower ones. */
6197 for (pair = values; pair; pair = TREE_CHAIN (pair))
6199 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6200 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6201 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6202 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6205 /* Replace the decl nodes in VALUES with their names. */
6206 for (pair = values; pair; pair = TREE_CHAIN (pair))
6207 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6209 TYPE_VALUES (enumtype) = values;
6212 /* Fix up all variant types of this enum type. */
6213 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6215 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6216 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6217 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6218 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6219 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6220 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6221 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6222 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6225 /* Finish debugging output for this type. */
6226 rest_of_type_compilation (enumtype, toplevel);
6228 /* This matches a push in start_enum. */
6234 /* Build and install a CONST_DECL for one value of the
6235 current enumeration type (one that was begun with start_enum).
6236 Return a tree-list containing the CONST_DECL and its value.
6237 Assignment of sequential values by default is handled here. */
6240 build_enumerator (name, value)
6243 register tree decl, type;
6245 /* Validate and default VALUE. */
6247 /* Remove no-op casts from the value. */
6249 STRIP_TYPE_NOPS (value);
6253 if (TREE_CODE (value) == INTEGER_CST)
6255 value = default_conversion (value);
6256 constant_expression_warning (value);
6260 error ("enumerator value for `%s' not integer constant",
6261 IDENTIFIER_POINTER (name));
6266 /* Default based on previous value. */
6267 /* It should no longer be possible to have NON_LVALUE_EXPR
6271 value = enum_next_value;
6273 error ("overflow in enumeration values");
6276 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6278 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6279 value = integer_zero_node;
6282 /* Set basis for default for next value. */
6283 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6284 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6286 /* Now create a declaration for the enum value name. */
6288 type = TREE_TYPE (value);
6289 type = type_for_size (MAX (TYPE_PRECISION (type),
6290 TYPE_PRECISION (integer_type_node)),
6292 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6293 && TREE_UNSIGNED (type)));
6295 decl = build_decl (CONST_DECL, name, type);
6296 DECL_INITIAL (decl) = value;
6297 TREE_TYPE (value) = type;
6300 return saveable_tree_cons (decl, value, NULL_TREE);
6303 /* Create the FUNCTION_DECL for a function definition.
6304 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6305 the declaration; they describe the function's name and the type it returns,
6306 but twisted together in a fashion that parallels the syntax of C.
6308 This function creates a binding context for the function body
6309 as well as setting up the FUNCTION_DECL in current_function_decl.
6311 Returns 1 on success. If the DECLARATOR is not suitable for a function
6312 (it defines a datum instead), we return 0, which tells
6313 yyparse to report a parse error.
6315 NESTED is nonzero for a function nested within another function. */
6318 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6319 tree declarator, declspecs, prefix_attributes, attributes;
6322 tree decl1, old_decl;
6324 int old_immediate_size_expand = immediate_size_expand;
6326 current_function_returns_value = 0; /* Assume, until we see it does. */
6327 current_function_returns_null = 0;
6328 warn_about_return_type = 0;
6329 current_extern_inline = 0;
6330 c_function_varargs = 0;
6332 shadowed_labels = 0;
6334 /* Don't expand any sizes in the return type of the function. */
6335 immediate_size_expand = 0;
6337 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6339 /* If the declarator is not suitable for a function definition,
6340 cause a syntax error. */
6343 immediate_size_expand = old_immediate_size_expand;
6347 decl_attributes (decl1, prefix_attributes, attributes);
6349 announce_function (decl1);
6351 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6353 error ("return-type is an incomplete type");
6354 /* Make it return void instead. */
6356 = build_function_type (void_type_node,
6357 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6360 if (warn_about_return_type)
6361 warning ("return-type defaults to `int'");
6363 /* Save the parm names or decls from this function's declarator
6364 where store_parm_decls will find them. */
6365 current_function_parms = last_function_parms;
6366 current_function_parm_tags = last_function_parm_tags;
6368 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6369 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6370 DECL_INITIAL (decl1) = error_mark_node;
6372 /* If this definition isn't a prototype and we had a prototype declaration
6373 before, copy the arg type info from that prototype.
6374 But not if what we had before was a builtin function. */
6375 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6376 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6377 && !DECL_BUILT_IN (old_decl)
6378 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6379 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6380 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6382 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6383 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6384 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6387 /* If there is no explicit declaration, look for any out-of-scope implicit
6390 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6392 /* Optionally warn of old-fashioned def with no previous prototype. */
6393 if (warn_strict_prototypes
6394 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6395 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6396 warning ("function declaration isn't a prototype");
6397 /* Optionally warn of any global def with no previous prototype. */
6398 else if (warn_missing_prototypes
6399 && TREE_PUBLIC (decl1)
6400 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6401 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6402 warning_with_decl (decl1, "no previous prototype for `%s'");
6403 /* Optionally warn of any def with no previous prototype
6404 if the function has already been used. */
6405 else if (warn_missing_prototypes
6406 && old_decl != 0 && TREE_USED (old_decl)
6407 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6408 warning_with_decl (decl1,
6409 "`%s' was used with no prototype before its definition");
6410 /* Optionally warn of any global def with no previous declaration. */
6411 else if (warn_missing_declarations
6412 && TREE_PUBLIC (decl1)
6414 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6415 warning_with_decl (decl1, "no previous declaration for `%s'");
6416 /* Optionally warn of any def with no previous declaration
6417 if the function has already been used. */
6418 else if (warn_missing_declarations
6419 && old_decl != 0 && TREE_USED (old_decl)
6420 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6421 warning_with_decl (decl1,
6422 "`%s' was used with no declaration before its definition");
6424 /* This is a definition, not a reference.
6425 So normally clear DECL_EXTERNAL.
6426 However, `extern inline' acts like a declaration
6427 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6428 DECL_EXTERNAL (decl1) = current_extern_inline;
6430 /* This function exists in static storage.
6431 (This does not mean `static' in the C sense!) */
6432 TREE_STATIC (decl1) = 1;
6434 /* A nested function is not global. */
6435 if (current_function_decl != 0)
6436 TREE_PUBLIC (decl1) = 0;
6438 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6440 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6445 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6446 != integer_type_node)
6447 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6449 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6450 args = TREE_CHAIN (args))
6452 tree type = args ? TREE_VALUE (args) : 0;
6454 if (type == void_type_node)
6461 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6462 pedwarn_with_decl (decl1,
6463 "first argument of `%s' should be `int'");
6467 if (TREE_CODE (type) != POINTER_TYPE
6468 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6469 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6471 pedwarn_with_decl (decl1,
6472 "second argument of `%s' should be `char **'");
6476 if (TREE_CODE (type) != POINTER_TYPE
6477 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6478 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6480 pedwarn_with_decl (decl1,
6481 "third argument of `%s' should probably be `char **'");
6486 /* It is intentional that this message does not mention the third
6487 argument, which is warned for only pedantically, because it's
6488 blessed by mention in an appendix of the standard. */
6489 if (argct > 0 && (argct < 2 || argct > 3))
6490 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6492 if (argct == 3 && pedantic)
6493 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6495 if (! TREE_PUBLIC (decl1))
6496 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6499 /* Record the decl so that the function name is defined.
6500 If we already have a decl for this name, and it is a FUNCTION_DECL,
6501 use the old decl. */
6503 current_function_decl = pushdecl (decl1);
6506 declare_parm_level (1);
6507 current_binding_level->subblocks_tag_transparent = 1;
6509 make_function_rtl (current_function_decl);
6511 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6512 /* Promote the value to int before returning it. */
6513 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6515 /* It retains unsignedness if traditional
6516 or if not really getting wider. */
6517 if (TREE_UNSIGNED (restype)
6518 && (flag_traditional
6519 || (TYPE_PRECISION (restype)
6520 == TYPE_PRECISION (integer_type_node))))
6521 restype = unsigned_type_node;
6523 restype = integer_type_node;
6525 DECL_RESULT (current_function_decl)
6526 = build_decl (RESULT_DECL, NULL_TREE, restype);
6529 /* Allocate further tree nodes temporarily during compilation
6530 of this function only. */
6531 temporary_allocation ();
6533 /* If this fcn was already referenced via a block-scope `extern' decl
6534 (or an implicit decl), propagate certain information about the usage. */
6535 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6536 TREE_ADDRESSABLE (current_function_decl) = 1;
6538 immediate_size_expand = old_immediate_size_expand;
6543 /* Record that this function is going to be a varargs function.
6544 This is called before store_parm_decls, which is too early
6545 to call mark_varargs directly. */
6550 c_function_varargs = 1;
6553 /* Store the parameter declarations into the current function declaration.
6554 This is called after parsing the parameter declarations, before
6555 digesting the body of the function.
6557 For an old-style definition, modify the function's type
6558 to specify at least the number of arguments. */
6563 register tree fndecl = current_function_decl;
6566 /* This is either a chain of PARM_DECLs (if a prototype was used)
6567 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6568 tree specparms = current_function_parms;
6570 /* This is a list of types declared among parms in a prototype. */
6571 tree parmtags = current_function_parm_tags;
6573 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6574 register tree parmdecls = getdecls ();
6576 /* This is a chain of any other decls that came in among the parm
6577 declarations. If a parm is declared with enum {foo, bar} x;
6578 then CONST_DECLs for foo and bar are put here. */
6581 /* Nonzero if this definition is written with a prototype. */
6584 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6586 /* This case is when the function was defined with an ANSI prototype.
6587 The parms already have decls, so we need not do anything here
6588 except record them as in effect
6589 and complain if any redundant old-style parm decls were written. */
6600 error_with_decl (fndecl,
6601 "parm types given both in parmlist and separately");
6602 /* Get rid of the erroneous decls; don't keep them on
6603 the list of parms, since they might not be PARM_DECLs. */
6604 for (decl = current_binding_level->names;
6605 decl; decl = TREE_CHAIN (decl))
6606 if (DECL_NAME (decl))
6607 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6608 for (link = current_binding_level->shadowed;
6609 link; link = TREE_CHAIN (link))
6610 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6611 current_binding_level->names = 0;
6612 current_binding_level->shadowed = 0;
6615 specparms = nreverse (specparms);
6616 for (parm = specparms; parm; parm = next)
6618 next = TREE_CHAIN (parm);
6619 if (TREE_CODE (parm) == PARM_DECL)
6621 if (DECL_NAME (parm) == 0)
6622 error_with_decl (parm, "parameter name omitted");
6623 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6625 error_with_decl (parm, "parameter `%s' declared void");
6626 /* Change the type to error_mark_node so this parameter
6627 will be ignored by assign_parms. */
6628 TREE_TYPE (parm) = error_mark_node;
6634 /* If we find an enum constant or a type tag,
6635 put it aside for the moment. */
6636 TREE_CHAIN (parm) = 0;
6637 others = chainon (others, parm);
6641 /* Get the decls in their original chain order
6642 and record in the function. */
6643 DECL_ARGUMENTS (fndecl) = getdecls ();
6646 /* If this function takes a variable number of arguments,
6647 add a phony parameter to the end of the parm list,
6648 to represent the position of the first unnamed argument. */
6649 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6652 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6653 /* Let's hope the address of the unnamed parm
6654 won't depend on its type. */
6655 TREE_TYPE (dummy) = integer_type_node;
6656 DECL_ARG_TYPE (dummy) = integer_type_node;
6657 DECL_ARGUMENTS (fndecl)
6658 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6662 /* Now pushdecl the enum constants. */
6663 for (parm = others; parm; parm = next)
6665 next = TREE_CHAIN (parm);
6666 if (DECL_NAME (parm) == 0)
6668 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6670 else if (TREE_CODE (parm) != PARM_DECL)
6674 storetags (chainon (parmtags, gettags ()));
6678 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6679 each with a parm name as the TREE_VALUE.
6681 PARMDECLS is a chain of declarations for parameters.
6682 Warning! It can also contain CONST_DECLs which are not parameters
6683 but are names of enumerators of any enum types
6684 declared among the parameters.
6686 First match each formal parameter name with its declaration.
6687 Associate decls with the names and store the decls
6688 into the TREE_PURPOSE slots. */
6690 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6691 DECL_RESULT (parm) = 0;
6693 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6695 register tree tail, found = NULL;
6697 if (TREE_VALUE (parm) == 0)
6699 error_with_decl (fndecl, "parameter name missing from parameter list");
6700 TREE_PURPOSE (parm) = 0;
6704 /* See if any of the parmdecls specifies this parm by name.
6705 Ignore any enumerator decls. */
6706 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6707 if (DECL_NAME (tail) == TREE_VALUE (parm)
6708 && TREE_CODE (tail) == PARM_DECL)
6714 /* If declaration already marked, we have a duplicate name.
6715 Complain, and don't use this decl twice. */
6716 if (found && DECL_RESULT (found) != 0)
6718 error_with_decl (found, "multiple parameters named `%s'");
6722 /* If the declaration says "void", complain and ignore it. */
6723 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6725 error_with_decl (found, "parameter `%s' declared void");
6726 TREE_TYPE (found) = integer_type_node;
6727 DECL_ARG_TYPE (found) = integer_type_node;
6728 layout_decl (found, 0);
6731 /* Traditionally, a parm declared float is actually a double. */
6732 if (found && flag_traditional
6733 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6735 TREE_TYPE (found) = double_type_node;
6736 DECL_ARG_TYPE (found) = double_type_node;
6737 layout_decl (found, 0);
6740 /* If no declaration found, default to int. */
6743 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6745 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6746 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6747 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6749 warning_with_decl (found, "type of `%s' defaults to `int'");
6753 TREE_PURPOSE (parm) = found;
6755 /* Mark this decl as "already found" -- see test, above.
6756 It is safe to use DECL_RESULT for this
6757 since it is not used in PARM_DECLs or CONST_DECLs. */
6758 DECL_RESULT (found) = error_mark_node;
6761 /* Put anything which is on the parmdecls chain and which is
6762 not a PARM_DECL onto the list NONPARMS. (The types of
6763 non-parm things which might appear on the list include
6764 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6765 any actual PARM_DECLs not matched with any names. */
6768 for (parm = parmdecls; parm; )
6770 tree next = TREE_CHAIN (parm);
6771 TREE_CHAIN (parm) = 0;
6773 if (TREE_CODE (parm) != PARM_DECL)
6774 nonparms = chainon (nonparms, parm);
6777 /* Complain about args with incomplete types. */
6778 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6780 error_with_decl (parm, "parameter `%s' has incomplete type");
6781 TREE_TYPE (parm) = error_mark_node;
6784 if (DECL_RESULT (parm) == 0)
6786 error_with_decl (parm,
6787 "declaration for parameter `%s' but no such parameter");
6788 /* Pretend the parameter was not missing.
6789 This gets us to a standard state and minimizes
6790 further error messages. */
6792 = chainon (specparms,
6793 tree_cons (parm, NULL_TREE, NULL_TREE));
6800 /* Chain the declarations together in the order of the list of names. */
6801 /* Store that chain in the function decl, replacing the list of names. */
6803 DECL_ARGUMENTS (fndecl) = 0;
6806 for (last = 0; parm; parm = TREE_CHAIN (parm))
6807 if (TREE_PURPOSE (parm))
6810 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6812 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6813 last = TREE_PURPOSE (parm);
6814 TREE_CHAIN (last) = 0;
6818 /* If there was a previous prototype,
6819 set the DECL_ARG_TYPE of each argument according to
6820 the type previously specified, and report any mismatches. */
6822 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6825 for (parm = DECL_ARGUMENTS (fndecl),
6826 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6827 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6828 != void_type_node));
6829 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6831 if (parm == 0 || type == 0
6832 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6834 error ("number of arguments doesn't match prototype");
6835 error_with_file_and_line (current_function_prototype_file,
6836 current_function_prototype_line,
6837 "prototype declaration");
6840 /* Type for passing arg must be consistent
6841 with that declared for the arg. */
6842 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6844 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6845 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6847 /* Adjust argument to match prototype. E.g. a previous
6848 `int foo(float);' prototype causes
6849 `int foo(x) float x; {...}' to be treated like
6850 `int foo(float x) {...}'. This is particularly
6851 useful for argument types like uid_t. */
6852 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6853 #ifdef PROMOTE_PROTOTYPES
6854 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6855 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6856 && TYPE_PRECISION (TREE_TYPE (parm))
6857 < TYPE_PRECISION (integer_type_node))
6858 DECL_ARG_TYPE (parm) = integer_type_node;
6862 pedwarn ("promoted argument `%s' doesn't match prototype",
6863 IDENTIFIER_POINTER (DECL_NAME (parm)));
6864 warning_with_file_and_line
6865 (current_function_prototype_file,
6866 current_function_prototype_line,
6867 "prototype declaration");
6870 /* If -traditional, allow `int' argument to match
6871 `unsigned' prototype. */
6872 else if (! (flag_traditional
6873 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6874 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6876 error ("argument `%s' doesn't match prototype",
6877 IDENTIFIER_POINTER (DECL_NAME (parm)));
6878 error_with_file_and_line (current_function_prototype_file,
6879 current_function_prototype_line,
6880 "prototype declaration");
6884 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6887 /* Otherwise, create a prototype that would match. */
6891 tree actual = 0, last = 0, type;
6893 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6895 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6898 TREE_CHAIN (last) = type;
6903 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6905 TREE_CHAIN (last) = type;
6909 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6910 of the type of this function, but we need to avoid having this
6911 affect the types of other similarly-typed functions, so we must
6912 first force the generation of an identical (but separate) type
6913 node for the relevant function type. The new node we create
6914 will be a variant of the main variant of the original function
6917 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6919 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6922 /* Now store the final chain of decls for the arguments
6923 as the decl-chain of the current lexical scope.
6924 Put the enumerators in as well, at the front so that
6925 DECL_ARGUMENTS is not modified. */
6927 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6930 /* Make sure the binding level for the top of the function body
6931 gets a BLOCK if there are any in the function.
6932 Otherwise, the dbx output is wrong. */
6934 keep_next_if_subblocks = 1;
6936 /* ??? This might be an improvement,
6937 but needs to be thought about some more. */
6939 keep_next_level_flag = 1;
6942 /* Write a record describing this function definition to the prototypes
6943 file (if requested). */
6945 gen_aux_info_record (fndecl, 1, 0, prototype);
6947 /* Initialize the RTL code for the function. */
6949 init_function_start (fndecl, input_filename, lineno);
6951 /* If this is a varargs function, inform function.c. */
6953 if (c_function_varargs)
6956 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6958 declare_function_name ();
6960 /* Set up parameters and prepare for return, for the function. */
6962 expand_function_start (fndecl, 0);
6964 /* If this function is `main', emit a call to `__main'
6965 to run global initializers, etc. */
6966 if (DECL_NAME (fndecl)
6967 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6968 && DECL_CONTEXT (fndecl) == NULL_TREE)
6969 expand_main_function ();
6972 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6973 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6974 stands for an ellipsis in the identifier list.
6976 PARMLIST is the data returned by get_parm_info for the
6977 parmlist that follows the semicolon.
6979 We return a value of the same sort that get_parm_info returns,
6980 except that it describes the combination of identifiers and parmlist. */
6983 combine_parm_decls (specparms, parmlist, void_at_end)
6984 tree specparms, parmlist;
6987 register tree fndecl = current_function_decl;
6990 tree parmdecls = TREE_PURPOSE (parmlist);
6992 /* This is a chain of any other decls that came in among the parm
6993 declarations. They were separated already by get_parm_info,
6994 so we just need to keep them separate. */
6995 tree nonparms = TREE_VALUE (parmlist);
6999 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
7000 DECL_RESULT (parm) = 0;
7002 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
7004 register tree tail, found = NULL;
7006 /* See if any of the parmdecls specifies this parm by name. */
7007 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
7008 if (DECL_NAME (tail) == TREE_VALUE (parm))
7014 /* If declaration already marked, we have a duplicate name.
7015 Complain, and don't use this decl twice. */
7016 if (found && DECL_RESULT (found) != 0)
7018 error_with_decl (found, "multiple parameters named `%s'");
7022 /* If the declaration says "void", complain and ignore it. */
7023 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7025 error_with_decl (found, "parameter `%s' declared void");
7026 TREE_TYPE (found) = integer_type_node;
7027 DECL_ARG_TYPE (found) = integer_type_node;
7028 layout_decl (found, 0);
7031 /* Traditionally, a parm declared float is actually a double. */
7032 if (found && flag_traditional
7033 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7035 TREE_TYPE (found) = double_type_node;
7036 DECL_ARG_TYPE (found) = double_type_node;
7037 layout_decl (found, 0);
7040 /* If no declaration found, default to int. */
7043 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7045 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7046 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7047 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7048 error_with_decl (found, "type of parameter `%s' is not declared");
7052 TREE_PURPOSE (parm) = found;
7054 /* Mark this decl as "already found" -- see test, above.
7055 It is safe to use DECL_RESULT for this
7056 since it is not used in PARM_DECLs or CONST_DECLs. */
7057 DECL_RESULT (found) = error_mark_node;
7060 /* Complain about any actual PARM_DECLs not matched with any names. */
7062 for (parm = parmdecls; parm; )
7064 tree next = TREE_CHAIN (parm);
7065 TREE_CHAIN (parm) = 0;
7067 /* Complain about args with incomplete types. */
7068 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7070 error_with_decl (parm, "parameter `%s' has incomplete type");
7071 TREE_TYPE (parm) = error_mark_node;
7074 if (DECL_RESULT (parm) == 0)
7076 error_with_decl (parm,
7077 "declaration for parameter `%s' but no such parameter");
7078 /* Pretend the parameter was not missing.
7079 This gets us to a standard state and minimizes
7080 further error messages. */
7082 = chainon (specparms,
7083 tree_cons (parm, NULL_TREE, NULL_TREE));
7089 /* Chain the declarations together in the order of the list of names.
7090 At the same time, build up a list of their types, in reverse order. */
7096 for (last = 0; parm; parm = TREE_CHAIN (parm))
7097 if (TREE_PURPOSE (parm))
7100 parmdecls = TREE_PURPOSE (parm);
7102 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7103 last = TREE_PURPOSE (parm);
7104 TREE_CHAIN (last) = 0;
7106 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7111 return saveable_tree_cons (parmdecls, nonparms,
7112 nreverse (saveable_tree_cons (NULL_TREE,
7116 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7119 /* Finish up a function declaration and compile that function
7120 all the way to assembler language output. The free the storage
7121 for the function definition.
7123 This is called after parsing the body of the function definition.
7125 NESTED is nonzero if the function being finished is nested in another. */
7128 finish_function (nested)
7131 register tree fndecl = current_function_decl;
7133 /* TREE_READONLY (fndecl) = 1;
7134 This caused &foo to be of type ptr-to-const-function
7135 which then got a warning when stored in a ptr-to-function variable. */
7138 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7140 /* Must mark the RESULT_DECL as being in this function. */
7142 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7144 /* Obey `register' declarations if `setjmp' is called in this fn. */
7145 if (flag_traditional && current_function_calls_setjmp)
7147 setjmp_protect (DECL_INITIAL (fndecl));
7148 setjmp_protect_args ();
7151 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7153 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7154 != integer_type_node)
7156 /* You would expect the sense of this test to be the other way
7157 around, but if warn_main is set, we will already have warned,
7158 so this would be a duplicate. This is the warning you get
7159 in some environments even if you *don't* ask for it, because
7160 these are environments where it may be more of a problem than
7163 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7167 #ifdef DEFAULT_MAIN_RETURN
7168 /* Make it so that `main' always returns success by default. */
7169 DEFAULT_MAIN_RETURN;
7174 /* Generate rtl for function exit. */
7175 expand_function_end (input_filename, lineno, 0);
7177 /* So we can tell if jump_optimize sets it to 1. */
7180 /* Run the optimizers and output the assembler code for this function. */
7181 rest_of_compilation (fndecl);
7183 current_function_returns_null |= can_reach_end;
7185 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7186 warning ("`noreturn' function does return");
7187 else if (warn_return_type && can_reach_end
7188 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7189 /* If this function returns non-void and control can drop through,
7191 warning ("control reaches end of non-void function");
7192 /* With just -W, complain only if function returns both with
7193 and without a value. */
7194 else if (extra_warnings
7195 && current_function_returns_value && current_function_returns_null)
7196 warning ("this function may return with or without a value");
7198 /* If requested, warn about function definitions where the function will
7199 return a value (usually of some struct or union type) which itself will
7200 take up a lot of stack space. */
7202 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7204 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7208 register tree ret_type_size = TYPE_SIZE (ret_type);
7210 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7213 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7215 if (units > larger_than_size)
7216 warning_with_decl (fndecl,
7217 "size of return value of `%s' is %u bytes",
7223 /* Free all the tree nodes making up this function. */
7224 /* Switch back to allocating nodes permanently
7225 until we start another function. */
7227 permanent_allocation (1);
7229 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7231 /* Stop pointing to the local nodes about to be freed. */
7232 /* But DECL_INITIAL must remain nonzero so we know this
7233 was an actual function definition. */
7234 /* For a nested function, this is done in pop_c_function_context. */
7235 /* If rest_of_compilation set this to 0, leave it 0. */
7236 if (DECL_INITIAL (fndecl) != 0)
7237 DECL_INITIAL (fndecl) = error_mark_node;
7238 DECL_ARGUMENTS (fndecl) = 0;
7241 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7243 #ifndef ASM_OUTPUT_CONSTRUCTOR
7244 if (! flag_gnu_linker)
7245 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7248 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7250 if (DECL_STATIC_DESTRUCTOR (fndecl))
7252 #ifndef ASM_OUTPUT_DESTRUCTOR
7253 if (! flag_gnu_linker)
7254 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7257 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7262 /* Let the error reporting routines know that we're outside a
7263 function. For a nested function, this value is used in
7264 pop_c_function_context and then reset via pop_function_context. */
7265 current_function_decl = NULL;
7269 /* Save and restore the variables in this file and elsewhere
7270 that keep track of the progress of compilation of the current function.
7271 Used for nested functions. */
7275 struct c_function *next;
7277 tree shadowed_labels;
7280 int warn_about_return_type;
7282 struct binding_level *binding_level;
7285 struct c_function *c_function_chain;
7287 /* Save and reinitialize the variables
7288 used during compilation of a C function. */
7291 push_c_function_context ()
7293 struct c_function *p
7294 = (struct c_function *) xmalloc (sizeof (struct c_function));
7297 pedwarn ("ANSI C forbids nested functions");
7299 push_function_context ();
7301 p->next = c_function_chain;
7302 c_function_chain = p;
7304 p->named_labels = named_labels;
7305 p->shadowed_labels = shadowed_labels;
7306 p->returns_value = current_function_returns_value;
7307 p->returns_null = current_function_returns_null;
7308 p->warn_about_return_type = warn_about_return_type;
7309 p->extern_inline = current_extern_inline;
7310 p->binding_level = current_binding_level;
7313 /* Restore the variables used during compilation of a C function. */
7316 pop_c_function_context ()
7318 struct c_function *p = c_function_chain;
7321 /* Bring back all the labels that were shadowed. */
7322 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7323 if (DECL_NAME (TREE_VALUE (link)) != 0)
7324 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7325 = TREE_VALUE (link);
7327 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7329 /* Stop pointing to the local nodes about to be freed. */
7330 /* But DECL_INITIAL must remain nonzero so we know this
7331 was an actual function definition. */
7332 DECL_INITIAL (current_function_decl) = error_mark_node;
7333 DECL_ARGUMENTS (current_function_decl) = 0;
7336 pop_function_context ();
7338 c_function_chain = p->next;
7340 named_labels = p->named_labels;
7341 shadowed_labels = p->shadowed_labels;
7342 current_function_returns_value = p->returns_value;
7343 current_function_returns_null = p->returns_null;
7344 warn_about_return_type = p->warn_about_return_type;
7345 current_extern_inline = p->extern_inline;
7346 current_binding_level = p->binding_level;
7351 /* integrate_decl_tree calls this function, but since we don't use the
7352 DECL_LANG_SPECIFIC field, this is a no-op. */
7355 copy_lang_decl (node)
7356 tree node ATTRIBUTE_UNUSED;