1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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. */
33 #include "tree-inline.h"
50 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
52 { NORMAL, /* Ordinary declaration */
53 FUNCDEF, /* Function definition */
54 PARM, /* Declaration of parm before function body */
55 FIELD, /* Declaration inside struct or union */
56 BITFIELD, /* Likewise but with specified width */
57 TYPENAME}; /* Typename (inside cast or sizeof) */
60 /* Nonzero if we have seen an invalid cross reference
61 to a struct, union, or enum, but not yet printed the message. */
63 tree pending_invalid_xref;
64 /* File and line to appear in the eventual error message. */
65 const char *pending_invalid_xref_file;
66 int pending_invalid_xref_line;
68 /* While defining an enum type, this is 1 plus the last enumerator
69 constant value. Note that will do not have to save this or `enum_overflow'
70 around nested function definition since such a definition could only
71 occur in an enum value expression and we don't use these variables in
74 static tree enum_next_value;
76 /* Nonzero means that there was overflow computing enum_next_value. */
78 static int enum_overflow;
80 /* Parsing a function declarator leaves a list of parameter names
81 or a chain or parameter decls here. */
83 static tree last_function_parms;
85 /* Parsing a function declarator leaves here a chain of structure
86 and enum types declared in the parmlist. */
88 static tree last_function_parm_tags;
90 /* After parsing the declarator that starts a function definition,
91 `start_function' puts here the list of parameter names or chain of decls.
92 `store_parm_decls' finds it here. */
94 static tree current_function_parms;
96 /* Similar, for last_function_parm_tags. */
97 static tree current_function_parm_tags;
99 /* Similar, for the file and line that the prototype came from if this is
100 an old-style definition. */
101 static const char *current_function_prototype_file;
102 static int current_function_prototype_line;
104 /* The current statement tree. */
106 static struct stmt_tree_s c_stmt_tree;
108 /* The current scope statement stack. */
110 static tree c_scope_stmt_stack;
112 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
113 that have names. Here so we can clear out their names' definitions
114 at the end of the function. */
116 static tree named_labels;
118 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
120 static tree shadowed_labels;
122 /* Nonzero when store_parm_decls is called indicates a varargs function.
123 Value not meaningful after store_parm_decls. */
125 static int c_function_varargs;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline;
151 /* For each binding contour we allocate a binding_level structure
152 * which records the names defined in that contour.
155 * 1) one for each function definition,
156 * where internal declarations of the parameters appear.
157 * 2) one for each compound statement,
158 * to record its declarations.
160 * The current meaning of a name can be found by searching the levels from
161 * the current one out to the global one.
164 /* Note that the information in the `names' component of the global contour
165 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
169 /* A chain of _DECL nodes for all variables, constants, functions,
170 and typedef types. These are in the reverse of the order supplied.
174 /* A list of structure, union and enum definitions,
175 * for looking up tag names.
176 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
177 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
178 * or ENUMERAL_TYPE node.
182 /* For each level, a list of shadowed outer-level local definitions
183 to be restored when this level is popped.
184 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
185 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
188 /* For each level (except not the global one),
189 a chain of BLOCK nodes for all the levels
190 that were entered and exited one level down. */
193 /* The BLOCK node for this level, if one has been preallocated.
194 If 0, the BLOCK is allocated (if needed) when the level is popped. */
197 /* The binding level which this one is contained in (inherits from). */
198 struct binding_level *level_chain;
200 /* Nonzero for the level that holds the parameters of a function. */
203 /* Nonzero if this level "doesn't exist" for tags. */
204 char tag_transparent;
206 /* Nonzero if sublevels of this level "don't exist" for tags.
207 This is set in the parm level of a function definition
208 while reading the function body, so that the outermost block
209 of the function body will be tag-transparent. */
210 char subblocks_tag_transparent;
212 /* Nonzero means make a BLOCK for this level regardless of all else. */
215 /* Nonzero means make a BLOCK if this level has any subblocks. */
216 char keep_if_subblocks;
218 /* Number of decls in `names' that have incomplete
219 structure or union types. */
222 /* A list of decls giving the (reversed) specified order of parms,
223 not including any forward-decls in the parmlist.
224 This is so we can put the parms in proper order for assign_parms. */
228 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
230 /* The binding level currently in effect. */
232 static struct binding_level *current_binding_level;
234 /* A chain of binding_level structures awaiting reuse. */
236 static struct binding_level *free_binding_level;
238 /* The outermost binding level, for names of file scope.
239 This is created when the compiler is started and exists
240 through the entire run. */
242 static struct binding_level *global_binding_level;
244 /* Binding level structures are initialized by copying this one. */
246 static struct binding_level clear_binding_level
247 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
250 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
252 static int keep_next_level_flag;
254 /* Nonzero means make a BLOCK for the next level pushed
255 if it has subblocks. */
257 static int keep_next_if_subblocks;
259 /* The chain of outer levels of label scopes.
260 This uses the same data structure used for binding levels,
261 but it works differently: each link in the chain records
262 saved values of named_labels and shadowed_labels for
263 a label binding level outside the current one. */
265 static struct binding_level *label_level_chain;
267 /* Functions called automatically at the beginning and end of execution. */
269 tree static_ctors, static_dtors;
271 /* Forward declarations. */
273 static struct binding_level * make_binding_level PARAMS ((void));
274 static void mark_binding_level PARAMS ((void *));
275 static void clear_limbo_values PARAMS ((tree));
276 static int duplicate_decls PARAMS ((tree, tree, int));
277 static int redeclaration_error_message PARAMS ((tree, tree));
278 static void storedecls PARAMS ((tree));
279 static void storetags PARAMS ((tree));
280 static tree lookup_tag PARAMS ((enum tree_code, tree,
281 struct binding_level *, int));
282 static tree lookup_tag_reverse PARAMS ((tree));
283 static tree grokdeclarator PARAMS ((tree, tree, enum decl_context,
285 static tree grokparms PARAMS ((tree, int));
286 static void layout_array_type PARAMS ((tree));
287 static tree c_make_fname_decl PARAMS ((tree, int));
288 static void c_expand_body PARAMS ((tree, int, int));
289 static void warn_if_shadowing PARAMS ((tree, tree));
291 /* C-specific option variables. */
293 /* Nonzero means allow type mismatches in conditional expressions;
294 just make their values `void'. */
296 int flag_cond_mismatch;
298 /* Nonzero means don't recognize the keyword `asm'. */
302 /* Nonzero means enable C89 Amendment 1 features. */
306 /* Nonzero means use the ISO C99 dialect of C. */
310 /* Nonzero means that we have builtin functions, and main is an int */
314 /* Nonzero means add default format_arg attributes for functions not
317 int flag_noniso_default_format_attributes = 1;
319 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
321 int flag_signed_bitfields = 1;
322 int explicit_flag_signed_bitfields = 0;
324 /* Nonzero means warn about use of implicit int. */
326 int warn_implicit_int;
328 /* Nonzero means warn about usage of long long when `-pedantic'. */
330 int warn_long_long = 1;
332 /* Nonzero means message about use of implicit function declarations;
333 1 means warning; 2 means error. */
335 int mesg_implicit_function_declaration = -1;
337 /* Nonzero means give string constants the type `const char *'
338 to get extra warnings from them. These warnings will be too numerous
339 to be useful, except in thoroughly ANSIfied programs. */
341 int flag_const_strings;
343 /* Nonzero means warn about pointer casts that can drop a type qualifier
344 from the pointer target type. */
348 /* Nonzero means warn when casting a function call to a type that does
349 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
350 when there is no previous declaration of sqrt or malloc. */
352 int warn_bad_function_cast;
354 /* Warn about functions which might be candidates for format attributes. */
356 int warn_missing_format_attribute;
358 /* Warn about traditional constructs whose meanings changed in ANSI C. */
360 int warn_traditional;
362 /* Nonzero means warn about sizeof(function) or addition/subtraction
363 of function pointers. */
365 int warn_pointer_arith;
367 /* Nonzero means warn for non-prototype function decls
368 or non-prototyped defs without previous prototype. */
370 int warn_strict_prototypes;
372 /* Nonzero means warn for any global function def
373 without separate previous prototype decl. */
375 int warn_missing_prototypes;
377 /* Nonzero means warn for any global function def
378 without separate previous decl. */
380 int warn_missing_declarations;
382 /* Nonzero means warn about multiple (redundant) decls for the same single
383 variable or function. */
385 int warn_redundant_decls = 0;
387 /* Nonzero means warn about extern declarations of objects not at
388 file-scope level and about *all* declarations of functions (whether
389 extern or static) not at file-scope level. Note that we exclude
390 implicit function declarations. To get warnings about those, use
393 int warn_nested_externs = 0;
395 /* Warn about a subscript that has type char. */
397 int warn_char_subscripts = 0;
399 /* Warn if a type conversion is done that might have confusing results. */
403 /* Warn if adding () is suggested. */
405 int warn_parentheses;
407 /* Warn if initializer is not completely bracketed. */
409 int warn_missing_braces;
411 /* Warn if main is suspicious. */
415 /* Warn about #pragma directives that are not recognised. */
417 int warn_unknown_pragmas = 0; /* Tri state variable. */
419 /* Warn about comparison of signed and unsigned values.
420 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
422 int warn_sign_compare = -1;
424 /* Warn about testing equality of floating point numbers. */
426 int warn_float_equal = 0;
428 /* Nonzero means `$' can be in an identifier. */
430 #ifndef DOLLARS_IN_IDENTIFIERS
431 #define DOLLARS_IN_IDENTIFIERS 1
433 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
435 /* States indicating how grokdeclarator() should handle declspecs marked
436 with __attribute__((deprecated)). An object declared as
437 __attribute__((deprecated)) suppresses warnings of uses of other
440 enum deprecated_states {
445 static enum deprecated_states deprecated_state = DEPRECATED_NORMAL;
447 /* Decode the string P as a language-specific option for C.
448 Return the number of strings consumed. Should not complain
449 if it does not recognise the option. */
452 c_decode_option (argc, argv)
453 int argc ATTRIBUTE_UNUSED;
456 int strings_processed;
459 static const struct {
460 /* The name of the option. */
462 /* If non-NULL, a flag variable to set to 0 or 1. If NULL,
463 this means that cpp handles this option. */
466 /* This list is in alphabetical order. Keep it like that. */
467 { "bad-function-cast", &warn_bad_function_cast },
468 { "cast-qual", &warn_cast_qual },
469 { "char-subscripts", &warn_char_subscripts },
471 { "comments", NULL },
472 { "conversion", &warn_conversion },
473 { "div-by-zero", &warn_div_by_zero },
474 { "float-equal", &warn_float_equal },
475 { "format-extra-args", &warn_format_extra_args },
476 { "format-zero-length", &warn_format_zero_length },
477 { "format-nonliteral", &warn_format_nonliteral },
478 { "format-security", &warn_format_security },
479 { "format-y2k", &warn_format_y2k },
480 { "implicit-function-declaration", &mesg_implicit_function_declaration },
481 { "implicit-int", &warn_implicit_int },
483 { "long-long", &warn_long_long },
484 { "main", &warn_main },
485 { "missing-braces", &warn_missing_braces },
486 { "missing-declarations", &warn_missing_declarations },
487 { "missing-format-attribute", &warn_missing_format_attribute },
488 { "missing-prototypes", &warn_missing_prototypes },
489 { "multichar", &warn_multichar },
490 { "nested-externs", &warn_nested_externs },
491 { "nonnull", &warn_nonnull },
492 { "parentheses", &warn_parentheses },
493 { "pointer-arith", &warn_pointer_arith },
494 { "redundant-decls", &warn_redundant_decls },
495 { "return-type", &warn_return_type },
496 { "sequence-point", &warn_sequence_point },
497 { "sign-compare", &warn_sign_compare },
498 { "strict-prototypes", &warn_strict_prototypes },
499 { "traditional", &warn_traditional },
500 { "trigraphs", NULL },
502 { "write-strings", &flag_const_strings }
505 strings_processed = cpp_handle_option (parse_in, argc, argv, 0);
507 if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
512 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
516 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
520 else if (!strncmp (p, "-std=", 5))
522 /* Select the appropriate language standard. We currently
524 -std=iso9899:1990 same as -ansi
525 -std=iso9899:199409 ISO C as modified in amend. 1
526 -std=iso9899:1999 ISO C 99
527 -std=c89 same as -std=iso9899:1990
528 -std=c99 same as -std=iso9899:1999
529 -std=gnu89 default, iso9899:1990 + gnu extensions
530 -std=gnu99 iso9899:1999 + gnu extensions
532 const char *const argstart = &p[5];
534 if (!strcmp (argstart, "iso9899:1990")
535 || !strcmp (argstart, "c89"))
540 flag_writable_strings = 0;
542 flag_no_nonansi_builtin = 1;
543 flag_noniso_default_format_attributes = 0;
547 else if (!strcmp (argstart, "iso9899:199409"))
552 else if (!strcmp (argstart, "iso9899:199x")
553 || !strcmp (argstart, "iso9899:1999")
554 || !strcmp (argstart, "c9x")
555 || !strcmp (argstart, "c99"))
557 flag_writable_strings = 0;
559 flag_no_nonansi_builtin = 1;
560 flag_noniso_default_format_attributes = 0;
565 else if (!strcmp (argstart, "gnu89"))
567 flag_writable_strings = 0;
569 flag_no_nonansi_builtin = 0;
570 flag_noniso_default_format_attributes = 1;
574 else if (!strcmp (argstart, "gnu9x") || !strcmp (argstart, "gnu99"))
576 flag_writable_strings = 0;
578 flag_no_nonansi_builtin = 0;
579 flag_noniso_default_format_attributes = 1;
583 else if (!strcmp (argstart, "c++98"))
584 ; /* Handled by cpplib. */
586 error ("unknown C standard `%s'", argstart);
588 else if (!strcmp (p, "-fdollars-in-identifiers"))
589 dollars_in_ident = 1;
590 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
591 dollars_in_ident = 0;
592 else if (!strcmp (p, "-fsigned-char"))
593 flag_signed_char = 1;
594 else if (!strcmp (p, "-funsigned-char"))
595 flag_signed_char = 0;
596 else if (!strcmp (p, "-fno-signed-char"))
597 flag_signed_char = 0;
598 else if (!strcmp (p, "-fno-unsigned-char"))
599 flag_signed_char = 1;
600 else if (!strcmp (p, "-fsigned-bitfields")
601 || !strcmp (p, "-fno-unsigned-bitfields"))
603 flag_signed_bitfields = 1;
604 explicit_flag_signed_bitfields = 1;
606 else if (!strcmp (p, "-funsigned-bitfields")
607 || !strcmp (p, "-fno-signed-bitfields"))
609 flag_signed_bitfields = 0;
610 explicit_flag_signed_bitfields = 1;
612 else if (!strcmp (p, "-fshort-enums"))
613 flag_short_enums = 1;
614 else if (!strcmp (p, "-fno-short-enums"))
615 flag_short_enums = 0;
616 else if (!strcmp (p, "-fshort-wchar"))
617 flag_short_wchar = 1;
618 else if (!strcmp (p, "-fno-short-wchar"))
619 flag_short_wchar = 0;
620 else if (!strcmp (p, "-fcond-mismatch"))
621 flag_cond_mismatch = 1;
622 else if (!strcmp (p, "-fno-cond-mismatch"))
623 flag_cond_mismatch = 0;
624 else if (!strcmp (p, "-fshort-double"))
625 flag_short_double = 1;
626 else if (!strcmp (p, "-fno-short-double"))
627 flag_short_double = 0;
628 else if (!strcmp (p, "-fasm"))
630 else if (!strcmp (p, "-fno-asm"))
632 else if (!strcmp (p, "-fbuiltin"))
634 else if (!strcmp (p, "-fno-builtin"))
636 else if (!strncmp (p, "-fno-builtin-", strlen ("-fno-builtin-")))
637 disable_builtin_function (p + strlen ("-fno-builtin-"));
638 else if (p[0] == '-' && p[1] == 'f' && dump_switch_p (p + 2))
640 else if (!strcmp (p, "-ansi"))
642 else if (!strcmp (p, "-undef"))
644 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
645 mesg_implicit_function_declaration = 2;
646 else if (!strncmp (p, "-Wformat=", 9))
647 set_Wformat (atoi (p + 9));
648 else if (!strcmp (p, "-Wformat"))
650 else if (!strcmp (p, "-Wno-format"))
652 else if (!strcmp (p, "-Wimplicit"))
654 warn_implicit_int = 1;
655 if (mesg_implicit_function_declaration != 2)
656 mesg_implicit_function_declaration = 1;
658 else if (!strcmp (p, "-Wno-implicit"))
659 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
660 else if (!strcmp (p, "-Wno-main"))
662 else if (!strcmp (p, "-Wunknown-pragmas"))
663 /* Set to greater than 1, so that even unknown pragmas in system
664 headers will be warned about. */
665 warn_unknown_pragmas = 2;
666 else if (!strcmp (p, "-Wno-unknown-pragmas"))
667 warn_unknown_pragmas = 0;
668 else if (!strcmp (p, "-Wall"))
670 /* We save the value of warn_uninitialized, since if they put
671 -Wuninitialized on the command line, we need to generate a
672 warning about not using it without also specifying -O. */
673 if (warn_uninitialized != 1)
674 warn_uninitialized = 2;
675 warn_implicit_int = 1;
676 mesg_implicit_function_declaration = 1;
677 warn_return_type = 1;
681 warn_char_subscripts = 1;
682 warn_parentheses = 1;
683 warn_sequence_point = 1;
684 warn_missing_braces = 1;
685 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
686 it off only if it's not explicit. */
688 /* Only warn about unknown pragmas that are not in system headers. */
689 warn_unknown_pragmas = 1;
691 else if (!strcmp (p, "-E"))
692 flag_preprocess_only = 1;
696 for (i = 0; i < sizeof (warn_options) / sizeof (warn_options[0]); i++)
697 if (strncmp (p, "-W", 2) == 0
698 && warn_options[i].flag
699 && (strcmp (p+2, warn_options[i].option) == 0
700 || (strncmp (p+2, "no-", 3) == 0
701 && strcmp (p+5, warn_options[i].option) == 0)))
703 *(warn_options[i].flag) = strncmp (p+2, "no-", 3) != 0;
706 return strings_processed;
713 c_print_identifier (file, node, indent)
718 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
719 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
720 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
721 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
722 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
723 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
724 if (C_IS_RESERVED_WORD (node))
726 tree rid = ridpointers[C_RID_CODE (node)];
727 indent_to (file, indent + 4);
728 fprintf (file, "rid ");
729 fprintf (file, HOST_PTR_PRINTF, (void *)rid);
730 fprintf (file, " \"%s\"", IDENTIFIER_POINTER (rid));
734 /* Hook called at end of compilation to assume 1 elt
735 for a top-level tentative array defn that wasn't complete before. */
738 c_finish_incomplete_decl (decl)
741 if (TREE_CODE (decl) == VAR_DECL)
743 tree type = TREE_TYPE (decl);
744 if (type != error_mark_node
745 && TREE_CODE (type) == ARRAY_TYPE
746 && ! DECL_EXTERNAL (decl)
747 && TYPE_DOMAIN (type) == 0)
749 warning_with_decl (decl, "array `%s' assumed to have one element");
751 complete_array_type (type, NULL_TREE, 1);
753 layout_decl (decl, 0);
758 /* Create a new `struct binding_level'. */
760 static struct binding_level *
761 make_binding_level ()
764 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
767 /* Nonzero if we are currently in the global binding level. */
772 return current_binding_level == global_binding_level;
778 keep_next_level_flag = 1;
781 /* Nonzero if the current level needs to have a BLOCK made. */
786 return ((current_binding_level->keep_if_subblocks
787 && current_binding_level->blocks != 0)
788 || current_binding_level->keep
789 || current_binding_level->names != 0
790 || (current_binding_level->tags != 0
791 && !current_binding_level->tag_transparent));
794 /* Identify this binding level as a level of parameters.
795 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
796 But it turns out there is no way to pass the right value for
797 DEFINITION_FLAG, so we ignore it. */
800 declare_parm_level (definition_flag)
801 int definition_flag ATTRIBUTE_UNUSED;
803 current_binding_level->parm_flag = 1;
806 /* Nonzero if currently making parm declarations. */
811 return current_binding_level->parm_flag;
814 /* Enter a new binding level.
815 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
816 not for that of tags. */
819 pushlevel (tag_transparent)
822 struct binding_level *newlevel = NULL_BINDING_LEVEL;
824 /* If this is the top level of a function,
825 just make sure that NAMED_LABELS is 0. */
827 if (current_binding_level == global_binding_level)
832 /* Reuse or create a struct for this binding level. */
834 if (free_binding_level)
836 newlevel = free_binding_level;
837 free_binding_level = free_binding_level->level_chain;
841 newlevel = make_binding_level ();
844 /* Add this level to the front of the chain (stack) of levels that
847 *newlevel = clear_binding_level;
848 newlevel->tag_transparent
850 || (current_binding_level
851 ? current_binding_level->subblocks_tag_transparent
853 newlevel->level_chain = current_binding_level;
854 current_binding_level = newlevel;
855 newlevel->keep = keep_next_level_flag;
856 keep_next_level_flag = 0;
857 newlevel->keep_if_subblocks = keep_next_if_subblocks;
858 keep_next_if_subblocks = 0;
861 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
864 clear_limbo_values (block)
869 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
870 if (DECL_NAME (tem) != 0)
871 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
873 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
874 clear_limbo_values (tem);
877 /* Exit a binding level.
878 Pop the level off, and restore the state of the identifier-decl mappings
879 that were in effect when this level was entered.
881 If KEEP is nonzero, this level had explicit declarations, so
882 and create a "block" (a BLOCK node) for the level
883 to record its declarations and subblocks for symbol table output.
885 If FUNCTIONBODY is nonzero, this level is the body of a function,
886 so create a block as if KEEP were set and also clear out all
889 If REVERSE is nonzero, reverse the order of decls before putting
890 them into the BLOCK. */
893 poplevel (keep, reverse, functionbody)
899 /* The chain of decls was accumulated in reverse order.
900 Put it into forward order, just for cleanliness. */
902 tree tags = current_binding_level->tags;
903 tree subblocks = current_binding_level->blocks;
906 int block_previously_created;
908 keep |= current_binding_level->keep;
910 /* This warning is turned off because it causes warnings for
911 declarations like `extern struct foo *x'. */
913 /* Warn about incomplete structure types in this level. */
914 for (link = tags; link; link = TREE_CHAIN (link))
915 if (!COMPLETE_TYPE_P (TREE_VALUE (link)))
917 tree type = TREE_VALUE (link);
918 tree type_name = TYPE_NAME (type);
919 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
921 : DECL_NAME (type_name));
922 switch (TREE_CODE (type))
925 error ("`struct %s' incomplete in scope ending here", id);
928 error ("`union %s' incomplete in scope ending here", id);
931 error ("`enum %s' incomplete in scope ending here", id);
937 /* Get the decls in the order they were written.
938 Usually current_binding_level->names is in reverse order.
939 But parameter decls were previously put in forward order. */
942 current_binding_level->names
943 = decls = nreverse (current_binding_level->names);
945 decls = current_binding_level->names;
947 /* Output any nested inline functions within this block
948 if they weren't already output. */
950 for (decl = decls; decl; decl = TREE_CHAIN (decl))
951 if (TREE_CODE (decl) == FUNCTION_DECL
952 && ! TREE_ASM_WRITTEN (decl)
953 && DECL_INITIAL (decl) != 0
954 && TREE_ADDRESSABLE (decl))
956 /* If this decl was copied from a file-scope decl
957 on account of a block-scope extern decl,
958 propagate TREE_ADDRESSABLE to the file-scope decl.
960 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
961 true, since then the decl goes through save_for_inline_copying. */
962 if (DECL_ABSTRACT_ORIGIN (decl) != 0
963 && DECL_ABSTRACT_ORIGIN (decl) != decl)
964 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
967 /* We used to warn about unused variables in expand_end_bindings,
968 i.e. while generating RTL. But in function-at-a-time mode we may
969 choose to never expand a function at all (e.g. auto inlining), so
970 we do this explicitly now. */
971 warn_about_unused_variables (getdecls ());
973 /* If there were any declarations or structure tags in that level,
974 or if this level is a function body,
975 create a BLOCK to record them for the life of this function. */
978 block_previously_created = (current_binding_level->this_block != 0);
979 if (block_previously_created)
980 block = current_binding_level->this_block;
981 else if (keep || functionbody
982 || (current_binding_level->keep_if_subblocks && subblocks != 0))
983 block = make_node (BLOCK);
986 BLOCK_VARS (block) = decls;
987 BLOCK_SUBBLOCKS (block) = subblocks;
990 /* In each subblock, record that this is its superior. */
992 for (link = subblocks; link; link = TREE_CHAIN (link))
993 BLOCK_SUPERCONTEXT (link) = block;
995 /* Clear out the meanings of the local variables of this level. */
997 for (link = decls; link; link = TREE_CHAIN (link))
999 if (DECL_NAME (link) != 0)
1001 /* If the ident. was used or addressed via a local extern decl,
1002 don't forget that fact. */
1003 if (DECL_EXTERNAL (link))
1005 if (TREE_USED (link))
1006 TREE_USED (DECL_NAME (link)) = 1;
1007 if (TREE_ADDRESSABLE (link))
1008 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1010 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1014 /* Restore all name-meanings of the outer levels
1015 that were shadowed by this level. */
1017 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1018 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1020 /* If the level being exited is the top level of a function,
1021 check over all the labels, and clear out the current
1022 (function local) meanings of their names. */
1026 clear_limbo_values (block);
1028 /* If this is the top level block of a function,
1029 the vars are the function's parameters.
1030 Don't leave them in the BLOCK because they are
1031 found in the FUNCTION_DECL instead. */
1033 BLOCK_VARS (block) = 0;
1035 /* Clear out the definitions of all label names,
1036 since their scopes end here,
1037 and add them to BLOCK_VARS. */
1039 for (link = named_labels; link; link = TREE_CHAIN (link))
1041 tree label = TREE_VALUE (link);
1043 if (DECL_INITIAL (label) == 0)
1045 error_with_decl (label, "label `%s' used but not defined");
1046 /* Avoid crashing later. */
1047 define_label (input_filename, lineno,
1050 else if (warn_unused_label && !TREE_USED (label))
1051 warning_with_decl (label, "label `%s' defined but not used");
1052 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1054 /* Put the labels into the "variables" of the
1055 top-level block, so debugger can see them. */
1056 TREE_CHAIN (label) = BLOCK_VARS (block);
1057 BLOCK_VARS (block) = label;
1061 /* Pop the current level, and free the structure for reuse. */
1064 struct binding_level *level = current_binding_level;
1065 current_binding_level = current_binding_level->level_chain;
1067 level->level_chain = free_binding_level;
1068 free_binding_level = level;
1071 /* Dispose of the block that we just made inside some higher level. */
1073 DECL_INITIAL (current_function_decl) = block;
1076 if (!block_previously_created)
1077 current_binding_level->blocks
1078 = chainon (current_binding_level->blocks, block);
1080 /* If we did not make a block for the level just exited,
1081 any blocks made for inner levels
1082 (since they cannot be recorded as subblocks in that level)
1083 must be carried forward so they will later become subblocks
1084 of something else. */
1086 current_binding_level->blocks
1087 = chainon (current_binding_level->blocks, subblocks);
1089 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1090 binding contour so that they point to the appropriate construct, i.e.
1091 either to the current FUNCTION_DECL node, or else to the BLOCK node
1092 we just constructed.
1094 Note that for tagged types whose scope is just the formal parameter
1095 list for some function type specification, we can't properly set
1096 their TYPE_CONTEXTs here, because we don't have a pointer to the
1097 appropriate FUNCTION_TYPE node readily available to us. For those
1098 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1099 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1100 node which will represent the "scope" for these "parameter list local"
1104 for (link = tags; link; link = TREE_CHAIN (link))
1105 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1107 for (link = tags; link; link = TREE_CHAIN (link))
1108 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1111 TREE_USED (block) = 1;
1116 /* Insert BLOCK at the end of the list of subblocks of the
1117 current binding level. This is used when a BIND_EXPR is expanded,
1118 to handle the BLOCK node inside the BIND_EXPR. */
1121 insert_block (block)
1124 TREE_USED (block) = 1;
1125 current_binding_level->blocks
1126 = chainon (current_binding_level->blocks, block);
1129 /* Set the BLOCK node for the innermost scope
1130 (the one we are currently in). */
1136 current_binding_level->this_block = block;
1137 current_binding_level->names = chainon (current_binding_level->names,
1138 BLOCK_VARS (block));
1139 current_binding_level->blocks = chainon (current_binding_level->blocks,
1140 BLOCK_SUBBLOCKS (block));
1146 struct binding_level *newlevel;
1148 /* Reuse or create a struct for this binding level. */
1150 if (free_binding_level)
1152 newlevel = free_binding_level;
1153 free_binding_level = free_binding_level->level_chain;
1157 newlevel = make_binding_level ();
1160 /* Add this level to the front of the chain (stack) of label levels. */
1162 newlevel->level_chain = label_level_chain;
1163 label_level_chain = newlevel;
1165 newlevel->names = named_labels;
1166 newlevel->shadowed = shadowed_labels;
1168 shadowed_labels = 0;
1174 struct binding_level *level = label_level_chain;
1177 /* Clear out the definitions of the declared labels in this level.
1178 Leave in the list any ordinary, non-declared labels. */
1179 for (link = named_labels, prev = 0; link;)
1181 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1183 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1185 error_with_decl (TREE_VALUE (link),
1186 "label `%s' used but not defined");
1187 /* Avoid crashing later. */
1188 define_label (input_filename, lineno,
1189 DECL_NAME (TREE_VALUE (link)));
1191 else if (warn_unused_label && !TREE_USED (TREE_VALUE (link)))
1192 warning_with_decl (TREE_VALUE (link),
1193 "label `%s' defined but not used");
1194 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1196 /* Delete this element from the list. */
1197 link = TREE_CHAIN (link);
1199 TREE_CHAIN (prev) = link;
1201 named_labels = link;
1206 link = TREE_CHAIN (link);
1210 /* Bring back all the labels that were shadowed. */
1211 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1212 if (DECL_NAME (TREE_VALUE (link)) != 0)
1213 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1214 = TREE_VALUE (link);
1216 named_labels = chainon (named_labels, level->names);
1217 shadowed_labels = level->shadowed;
1219 /* Pop the current level, and free the structure for reuse. */
1220 label_level_chain = label_level_chain->level_chain;
1221 level->level_chain = free_binding_level;
1222 free_binding_level = level;
1225 /* Push a definition or a declaration of struct, union or enum tag "name".
1226 "type" should be the type node.
1227 We assume that the tag "name" is not already defined.
1229 Note that the definition may really be just a forward reference.
1230 In that case, the TYPE_SIZE will be zero. */
1233 pushtag (name, type)
1236 struct binding_level *b;
1238 /* Find the proper binding level for this type tag. */
1240 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1245 /* Record the identifier as the type's name if it has none. */
1247 if (TYPE_NAME (type) == 0)
1248 TYPE_NAME (type) = name;
1251 b->tags = tree_cons (name, type, b->tags);
1253 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1254 tagged type we just added to the current binding level. This fake
1255 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1256 to output a representation of a tagged type, and it also gives
1257 us a convenient place to record the "scope start" address for the
1260 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1262 /* An approximation for now, so we can tell this is a function-scope tag.
1263 This will be updated in poplevel. */
1264 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1267 /* Handle when a new declaration NEWDECL
1268 has the same name as an old one OLDDECL
1269 in the same binding contour.
1270 Prints an error message if appropriate.
1272 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1273 Otherwise, return 0.
1275 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1276 and OLDDECL is in an outer binding level and should thus not be changed. */
1279 duplicate_decls (newdecl, olddecl, different_binding_level)
1280 tree newdecl, olddecl;
1281 int different_binding_level;
1283 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1284 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1285 && DECL_INITIAL (newdecl) != 0);
1286 tree oldtype = TREE_TYPE (olddecl);
1287 tree newtype = TREE_TYPE (newdecl);
1290 if (DECL_P (olddecl))
1292 if (TREE_CODE (newdecl) == FUNCTION_DECL
1293 && TREE_CODE (olddecl) == FUNCTION_DECL
1294 && (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl)))
1296 if (DECL_DECLARED_INLINE_P (newdecl)
1297 && DECL_UNINLINABLE (newdecl)
1298 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1299 /* Already warned elsewhere. */;
1300 else if (DECL_DECLARED_INLINE_P (olddecl)
1301 && DECL_UNINLINABLE (olddecl)
1302 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1303 /* Already warned. */;
1304 else if (DECL_DECLARED_INLINE_P (newdecl)
1305 && ! DECL_DECLARED_INLINE_P (olddecl)
1306 && DECL_UNINLINABLE (olddecl)
1307 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl)))
1309 warning_with_decl (newdecl,
1310 "function `%s' redeclared as inline");
1311 warning_with_decl (olddecl,
1312 "previous declaration of function `%s' with attribute noinline");
1314 else if (DECL_DECLARED_INLINE_P (olddecl)
1315 && DECL_UNINLINABLE (newdecl)
1316 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl)))
1318 warning_with_decl (newdecl,
1319 "function `%s' redeclared with attribute noinline");
1320 warning_with_decl (olddecl,
1321 "previous declaration of function `%s' was inline");
1325 DECL_ATTRIBUTES (newdecl)
1326 = (*targetm.merge_decl_attributes) (olddecl, newdecl);
1329 if (TREE_CODE (newtype) == ERROR_MARK
1330 || TREE_CODE (oldtype) == ERROR_MARK)
1333 /* New decl is completely inconsistent with the old one =>
1334 tell caller to replace the old one.
1335 This is always an error except in the case of shadowing a builtin. */
1336 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1338 if (TREE_CODE (olddecl) == FUNCTION_DECL
1339 && (DECL_BUILT_IN (olddecl)
1340 || DECL_BUILT_IN_NONANSI (olddecl)))
1342 /* If you declare a built-in or predefined function name as static,
1343 the old definition is overridden,
1344 but optionally warn this was a bad choice of name. */
1345 if (!TREE_PUBLIC (newdecl))
1349 else if (DECL_BUILT_IN (olddecl))
1350 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1352 warning_with_decl (newdecl, "shadowing library function `%s'");
1354 /* Likewise, if the built-in is not ansi, then programs can
1355 override it even globally without an error. */
1356 else if (! DECL_BUILT_IN (olddecl))
1357 warning_with_decl (newdecl,
1358 "library function `%s' declared as non-function");
1360 else if (DECL_BUILT_IN_NONANSI (olddecl))
1361 warning_with_decl (newdecl,
1362 "built-in function `%s' declared as non-function");
1364 warning_with_decl (newdecl,
1365 "built-in function `%s' declared as non-function");
1369 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1370 error_with_decl (olddecl, "previous declaration of `%s'");
1376 /* For real parm decl following a forward decl,
1377 return 1 so old decl will be reused. */
1378 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1379 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1382 /* The new declaration is the same kind of object as the old one.
1383 The declarations may partially match. Print warnings if they don't
1384 match enough. Ultimately, copy most of the information from the new
1385 decl to the old one, and keep using the old one. */
1387 if (TREE_CODE (olddecl) == FUNCTION_DECL && DECL_BUILT_IN (olddecl))
1389 /* A function declaration for a built-in function. */
1390 if (!TREE_PUBLIC (newdecl))
1392 /* If you declare a built-in function name as static, the
1393 built-in definition is overridden,
1394 but optionally warn this was a bad choice of name. */
1396 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1397 /* Discard the old built-in function. */
1400 else if (!types_match)
1402 /* Accept the return type of the new declaration if same modes. */
1403 tree oldreturntype = TREE_TYPE (oldtype);
1404 tree newreturntype = TREE_TYPE (newtype);
1406 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1408 /* Function types may be shared, so we can't just modify
1409 the return type of olddecl's function type. */
1411 = build_function_type (newreturntype,
1412 TYPE_ARG_TYPES (oldtype));
1413 trytype = build_type_attribute_variant (trytype,
1414 TYPE_ATTRIBUTES (oldtype));
1416 types_match = comptypes (newtype, trytype);
1420 /* Accept harmless mismatch in first argument type also.
1421 This is for the ffs and fprintf builtins. */
1422 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1423 && TYPE_ARG_TYPES (oldtype) != 0
1424 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1425 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1426 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1427 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1429 /* Function types may be shared, so we can't just modify
1430 the return type of olddecl's function type. */
1432 = build_function_type (TREE_TYPE (oldtype),
1433 tree_cons (NULL_TREE,
1434 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1435 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1436 trytype = build_type_attribute_variant (trytype,
1437 TYPE_ATTRIBUTES (oldtype));
1439 types_match = comptypes (newtype, trytype);
1443 if (! different_binding_level)
1444 TREE_TYPE (olddecl) = oldtype;
1446 else if (TYPE_ARG_TYPES (oldtype) == NULL
1447 && TYPE_ARG_TYPES (newtype) != NULL)
1449 /* For bcmp, bzero, fputs the builtin type has arguments not
1450 specified. Use the ones from the prototype so that type checking
1451 is done for them. */
1453 = build_function_type (TREE_TYPE (oldtype),
1454 TYPE_ARG_TYPES (newtype));
1455 trytype = build_type_attribute_variant (trytype,
1456 TYPE_ATTRIBUTES (oldtype));
1459 if (! different_binding_level)
1460 TREE_TYPE (olddecl) = oldtype;
1464 /* If types don't match for a built-in, throw away the built-in. */
1465 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1469 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1470 && DECL_SOURCE_LINE (olddecl) == 0)
1472 /* A function declaration for a predeclared function
1473 that isn't actually built in. */
1474 if (!TREE_PUBLIC (newdecl))
1476 /* If you declare it as static, the
1477 default definition is overridden. */
1480 else if (!types_match)
1482 /* If the types don't match, preserve volatility indication.
1483 Later on, we will discard everything else about the
1484 default declaration. */
1485 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1488 /* Permit char *foo () to match void *foo (...) if not pedantic,
1489 if one of them came from a system header file. */
1490 else if (!types_match
1491 && TREE_CODE (olddecl) == FUNCTION_DECL
1492 && TREE_CODE (newdecl) == FUNCTION_DECL
1493 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1494 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1495 && (DECL_IN_SYSTEM_HEADER (olddecl)
1496 || DECL_IN_SYSTEM_HEADER (newdecl))
1497 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1498 && TYPE_ARG_TYPES (oldtype) == 0
1499 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1500 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1502 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1503 && TYPE_ARG_TYPES (newtype) == 0
1504 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1505 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1508 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1509 /* Make sure we keep void * as ret type, not char *. */
1510 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1511 TREE_TYPE (newdecl) = newtype = oldtype;
1513 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1514 we will come back here again. */
1515 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1517 else if (!types_match
1518 /* Permit char *foo (int, ...); followed by char *foo ();
1520 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1522 /* Return types must still match. */
1523 && comptypes (TREE_TYPE (oldtype),
1524 TREE_TYPE (newtype))
1525 && TYPE_ARG_TYPES (newtype) == 0))
1527 error_with_decl (newdecl, "conflicting types for `%s'");
1528 /* Check for function type mismatch
1529 involving an empty arglist vs a nonempty one. */
1530 if (TREE_CODE (olddecl) == FUNCTION_DECL
1531 && comptypes (TREE_TYPE (oldtype),
1532 TREE_TYPE (newtype))
1533 && ((TYPE_ARG_TYPES (oldtype) == 0
1534 && DECL_INITIAL (olddecl) == 0)
1536 (TYPE_ARG_TYPES (newtype) == 0
1537 && DECL_INITIAL (newdecl) == 0)))
1539 /* Classify the problem further. */
1540 tree t = TYPE_ARG_TYPES (oldtype);
1542 t = TYPE_ARG_TYPES (newtype);
1543 for (; t; t = TREE_CHAIN (t))
1545 tree type = TREE_VALUE (t);
1547 if (TREE_CHAIN (t) == 0
1548 && TYPE_MAIN_VARIANT (type) != void_type_node)
1550 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1554 if (c_type_promotes_to (type) != type)
1556 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1561 error_with_decl (olddecl, "previous declaration of `%s'");
1565 errmsg = redeclaration_error_message (newdecl, olddecl);
1571 error_with_decl (newdecl, "redefinition of `%s'");
1574 error_with_decl (newdecl, "redeclaration of `%s'");
1577 error_with_decl (newdecl, "conflicting declarations of `%s'");
1583 error_with_decl (olddecl,
1584 ((DECL_INITIAL (olddecl)
1585 && current_binding_level == global_binding_level)
1586 ? "`%s' previously defined here"
1587 : "`%s' previously declared here"));
1590 else if (TREE_CODE (newdecl) == TYPE_DECL
1591 && (DECL_IN_SYSTEM_HEADER (olddecl)
1592 || DECL_IN_SYSTEM_HEADER (newdecl)))
1594 warning_with_decl (newdecl, "redefinition of `%s'");
1597 ((DECL_INITIAL (olddecl)
1598 && current_binding_level == global_binding_level)
1599 ? "`%s' previously defined here"
1600 : "`%s' previously declared here"));
1602 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1603 && DECL_INITIAL (olddecl) != 0
1604 && TYPE_ARG_TYPES (oldtype) == 0
1605 && TYPE_ARG_TYPES (newtype) != 0
1606 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1610 /* Prototype decl follows defn w/o prototype. */
1612 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1613 type = TYPE_ARG_TYPES (newtype),
1616 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1618 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1619 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1621 warning_with_decl (newdecl, "prototype for `%s' follows");
1622 warning_with_decl (olddecl, "non-prototype definition here");
1625 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1626 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1628 error_with_decl (newdecl,
1629 "prototype for `%s' follows and number of arguments doesn't match");
1630 error_with_decl (olddecl, "non-prototype definition here");
1634 /* Type for passing arg must be consistent
1635 with that declared for the arg. */
1636 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type)))
1638 error_with_decl (newdecl,
1639 "prototype for `%s' follows and argument %d doesn't match",
1641 error_with_decl (olddecl, "non-prototype definition here");
1647 /* Warn about mismatches in various flags. */
1650 /* Warn if function is now inline
1651 but was previously declared not inline and has been called. */
1652 if (TREE_CODE (olddecl) == FUNCTION_DECL
1653 && ! DECL_DECLARED_INLINE_P (olddecl)
1654 && DECL_DECLARED_INLINE_P (newdecl)
1655 && TREE_USED (olddecl))
1656 warning_with_decl (newdecl,
1657 "`%s' declared inline after being called");
1658 if (TREE_CODE (olddecl) == FUNCTION_DECL
1659 && ! DECL_DECLARED_INLINE_P (olddecl)
1660 && DECL_DECLARED_INLINE_P (newdecl)
1661 && DECL_INITIAL (olddecl) != 0)
1662 warning_with_decl (newdecl,
1663 "`%s' declared inline after its definition");
1665 /* If pedantic, warn when static declaration follows a non-static
1666 declaration. Otherwise, do so only for functions. */
1667 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1668 && TREE_PUBLIC (olddecl)
1669 && !TREE_PUBLIC (newdecl))
1670 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1672 /* If warn_traditional, warn when a non-static function
1673 declaration follows a static one. */
1674 if (warn_traditional && !in_system_header
1675 && TREE_CODE (olddecl) == FUNCTION_DECL
1676 && !TREE_PUBLIC (olddecl)
1677 && TREE_PUBLIC (newdecl))
1678 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1680 /* Warn when const declaration follows a non-const
1681 declaration, but not for functions. */
1682 if (TREE_CODE (olddecl) != FUNCTION_DECL
1683 && !TREE_READONLY (olddecl)
1684 && TREE_READONLY (newdecl))
1685 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1686 /* These bits are logically part of the type, for variables.
1687 But not for functions
1688 (where qualifiers are not valid ANSI anyway). */
1689 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1690 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1691 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1692 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1696 /* Optionally warn about more than one declaration for the same name. */
1697 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1698 /* Don't warn about a function declaration
1699 followed by a definition. */
1700 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1701 && DECL_INITIAL (olddecl) == 0)
1702 /* Don't warn about extern decl followed by (tentative) definition. */
1703 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1705 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1706 warning_with_decl (olddecl, "previous declaration of `%s'");
1709 /* Copy all the DECL_... slots specified in the new decl
1710 except for any that we copy here from the old type.
1712 Past this point, we don't change OLDTYPE and NEWTYPE
1713 even if we change the types of NEWDECL and OLDDECL. */
1717 /* When copying info to olddecl, we store into write_olddecl
1718 instead. This allows us to avoid modifying olddecl when
1719 different_binding_level is true. */
1720 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1722 /* Merge the data types specified in the two decls. */
1723 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1725 if (different_binding_level)
1727 if (TYPE_ARG_TYPES (oldtype) != 0
1728 && TYPE_ARG_TYPES (newtype) == 0)
1729 TREE_TYPE (newdecl) = common_type (newtype, oldtype);
1732 = build_type_attribute_variant
1734 merge_attributes (TYPE_ATTRIBUTES (newtype),
1735 TYPE_ATTRIBUTES (oldtype)));
1739 = TREE_TYPE (olddecl)
1740 = common_type (newtype, oldtype);
1743 /* Lay the type out, unless already done. */
1744 if (oldtype != TREE_TYPE (newdecl))
1746 if (TREE_TYPE (newdecl) != error_mark_node)
1747 layout_type (TREE_TYPE (newdecl));
1748 if (TREE_CODE (newdecl) != FUNCTION_DECL
1749 && TREE_CODE (newdecl) != TYPE_DECL
1750 && TREE_CODE (newdecl) != CONST_DECL)
1751 layout_decl (newdecl, 0);
1755 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1756 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1757 DECL_SIZE_UNIT (newdecl) = DECL_SIZE_UNIT (olddecl);
1758 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1759 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1760 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1762 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1763 DECL_USER_ALIGN (newdecl) |= DECL_ALIGN (olddecl);
1767 /* Keep the old rtl since we can safely use it. */
1768 COPY_DECL_RTL (olddecl, newdecl);
1770 /* Merge the type qualifiers. */
1771 if (TREE_CODE (olddecl) == FUNCTION_DECL
1772 && DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1773 && ! TREE_THIS_VOLATILE (newdecl))
1774 TREE_THIS_VOLATILE (write_olddecl) = 0;
1776 if (TREE_READONLY (newdecl))
1777 TREE_READONLY (write_olddecl) = 1;
1779 if (TREE_THIS_VOLATILE (newdecl))
1781 TREE_THIS_VOLATILE (write_olddecl) = 1;
1782 if (TREE_CODE (newdecl) == VAR_DECL
1783 /* If an automatic variable is re-declared in the same
1784 function scope, but the old declaration was not
1785 volatile, make_var_volatile() would crash because the
1786 variable would have been assigned to a pseudo, not a
1787 MEM. Since this duplicate declaration is invalid
1788 anyway, we just skip the call. */
1790 make_var_volatile (newdecl);
1793 /* Keep source location of definition rather than declaration. */
1794 /* When called with different_binding_level set, keep the old
1795 information so that meaningful diagnostics can be given. */
1796 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1797 && ! different_binding_level)
1799 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1800 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1803 /* Merge the unused-warning information. */
1804 if (DECL_IN_SYSTEM_HEADER (olddecl))
1805 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1806 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1807 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1809 /* Merge the initialization information. */
1810 /* When called with different_binding_level set, don't copy over
1811 DECL_INITIAL, so that we don't accidentally change function
1812 declarations into function definitions. */
1813 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1814 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1816 /* Merge the section attribute.
1817 We want to issue an error if the sections conflict but that must be
1818 done later in decl_attributes since we are called before attributes
1820 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1821 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1823 /* Copy the assembler name.
1824 Currently, it can only be defined in the prototype. */
1825 COPY_DECL_ASSEMBLER_NAME (olddecl, newdecl);
1827 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1829 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1830 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1831 DECL_NO_LIMIT_STACK (newdecl) |= DECL_NO_LIMIT_STACK (olddecl);
1832 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1833 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1836 /* If cannot merge, then use the new type and qualifiers,
1837 and don't preserve the old rtl. */
1838 else if (! different_binding_level)
1840 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1841 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1842 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1843 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1846 /* Merge the storage class information. */
1847 merge_weak (newdecl, olddecl);
1849 /* For functions, static overrides non-static. */
1850 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1852 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1853 /* This is since we don't automatically
1854 copy the attributes of NEWDECL into OLDDECL. */
1855 /* No need to worry about different_binding_level here because
1856 then TREE_PUBLIC (newdecl) was true. */
1857 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1858 /* If this clears `static', clear it in the identifier too. */
1859 if (! TREE_PUBLIC (olddecl))
1860 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1862 if (DECL_EXTERNAL (newdecl))
1864 if (! different_binding_level)
1866 /* Don't mess with these flags on local externs; they remain
1867 external even if there's a declaration at file scope which
1869 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1870 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1872 /* An extern decl does not override previous storage class. */
1873 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1874 if (! DECL_EXTERNAL (newdecl))
1875 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1879 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1880 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1883 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1885 /* If we're redefining a function previously defined as extern
1886 inline, make sure we emit debug info for the inline before we
1887 throw it away, in case it was inlined into a function that hasn't
1888 been written out yet. */
1889 if (new_is_definition && DECL_INITIAL (olddecl) && TREE_USED (olddecl))
1891 (*debug_hooks->outlining_inline_function) (olddecl);
1893 /* The new defn must not be inline. */
1894 DECL_INLINE (newdecl) = 0;
1895 DECL_UNINLINABLE (newdecl) = 1;
1899 /* If either decl says `inline', this fn is inline,
1900 unless its definition was passed already. */
1901 if (DECL_DECLARED_INLINE_P (newdecl)
1902 || DECL_DECLARED_INLINE_P (olddecl))
1903 DECL_DECLARED_INLINE_P (newdecl) = 1;
1905 DECL_UNINLINABLE (newdecl) = DECL_UNINLINABLE (olddecl)
1906 = (DECL_UNINLINABLE (newdecl) || DECL_UNINLINABLE (olddecl));
1909 if (DECL_BUILT_IN (olddecl))
1911 /* Get rid of any built-in function if new arg types don't match it
1912 or if we have a function definition. */
1913 if (! types_match || new_is_definition)
1915 if (! different_binding_level)
1917 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1918 DECL_BUILT_IN_CLASS (olddecl) = NOT_BUILT_IN;
1923 /* If redeclaring a builtin function, and not a definition,
1924 it stays built in. */
1925 DECL_BUILT_IN_CLASS (newdecl) = DECL_BUILT_IN_CLASS (olddecl);
1926 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
1930 /* Also preserve various other info from the definition. */
1931 if (! new_is_definition)
1933 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1934 /* When called with different_binding_level set, don't copy over
1935 DECL_INITIAL, so that we don't accidentally change function
1936 declarations into function definitions. */
1937 if (! different_binding_level)
1938 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1939 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1940 DECL_SAVED_TREE (newdecl) = DECL_SAVED_TREE (olddecl);
1941 DECL_NUM_STMTS (newdecl) = DECL_NUM_STMTS (olddecl);
1942 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1944 /* Set DECL_INLINE on the declaration if we've got a body
1945 from which to instantiate. */
1946 if (DECL_INLINE (olddecl) && ! DECL_UNINLINABLE (newdecl))
1948 DECL_INLINE (newdecl) = 1;
1949 DECL_ABSTRACT_ORIGIN (newdecl)
1950 = (different_binding_level
1951 ? DECL_ORIGIN (olddecl)
1952 : DECL_ABSTRACT_ORIGIN (olddecl));
1957 /* If a previous declaration said inline, mark the
1958 definition as inlinable. */
1959 if (DECL_DECLARED_INLINE_P (newdecl)
1960 && ! DECL_UNINLINABLE (newdecl))
1961 DECL_INLINE (newdecl) = 1;
1964 if (different_binding_level)
1967 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1968 But preserve OLDDECL's DECL_UID. */
1970 unsigned olddecl_uid = DECL_UID (olddecl);
1972 memcpy ((char *) olddecl + sizeof (struct tree_common),
1973 (char *) newdecl + sizeof (struct tree_common),
1974 sizeof (struct tree_decl) - sizeof (struct tree_common));
1975 DECL_UID (olddecl) = olddecl_uid;
1978 /* NEWDECL contains the merged attribute lists.
1979 Update OLDDECL to be the same. */
1980 DECL_ATTRIBUTES (olddecl) = DECL_ATTRIBUTES (newdecl);
1985 /* Check whether decl-node X shadows an existing declaration.
1986 OLDLOCAL is the old IDENTIFIER_LOCAL_VALUE of the DECL_NAME of X,
1987 which might be a NULL_TREE. */
1989 warn_if_shadowing (x, oldlocal)
1994 if (DECL_EXTERNAL (x))
1997 name = DECL_NAME (x);
1999 /* Warn if shadowing an argument at the top level of the body. */
2001 /* This warning doesn't apply to the parms of a nested fcn. */
2002 && ! current_binding_level->parm_flag
2003 /* Check that this is one level down from the parms. */
2004 && current_binding_level->level_chain->parm_flag
2005 /* Check that the decl being shadowed
2006 comes from the parm level, one level up. */
2007 && chain_member (oldlocal, current_binding_level->level_chain->names))
2009 if (TREE_CODE (oldlocal) == PARM_DECL)
2010 pedwarn ("declaration of `%s' shadows a parameter",
2011 IDENTIFIER_POINTER (name));
2013 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2014 IDENTIFIER_POINTER (name));
2016 /* Maybe warn if shadowing something else. */
2017 else if (warn_shadow
2018 /* No shadow warnings for internally generated vars. */
2019 && DECL_SOURCE_LINE (x) != 0
2020 /* No shadow warnings for vars made for inlining. */
2021 && ! DECL_FROM_INLINE (x))
2023 if (TREE_CODE (x) == PARM_DECL
2024 && current_binding_level->level_chain->parm_flag)
2025 /* Don't warn about the parm names in function declarator
2026 within a function declarator.
2027 It would be nice to avoid warning in any function
2028 declarator in a declaration, as opposed to a definition,
2029 but there is no way to tell it's not a definition. */
2033 if (TREE_CODE (oldlocal) == PARM_DECL)
2034 shadow_warning ("a parameter", name, oldlocal);
2036 shadow_warning ("a previous local", name, oldlocal);
2038 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2039 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2040 shadow_warning ("a global declaration", name,
2041 IDENTIFIER_GLOBAL_VALUE (name));
2045 /* Record a decl-node X as belonging to the current lexical scope.
2046 Check for errors (such as an incompatible declaration for the same
2047 name already seen in the same scope).
2049 Returns either X or an old decl for the same name.
2050 If an old decl is returned, it may have been smashed
2051 to agree with what X says. */
2058 tree name = DECL_NAME (x);
2059 struct binding_level *b = current_binding_level;
2061 /* Functions need the lang_decl data. */
2062 if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
2063 DECL_LANG_SPECIFIC (x) = (struct lang_decl *)
2064 ggc_alloc_cleared (sizeof (struct lang_decl));
2066 DECL_CONTEXT (x) = current_function_decl;
2067 /* A local extern declaration for a function doesn't constitute nesting.
2068 A local auto declaration does, since it's a forward decl
2069 for a nested function coming later. */
2070 if ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
2071 && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x))
2072 DECL_CONTEXT (x) = 0;
2076 int different_binding_level = 0;
2078 if (warn_nested_externs
2079 && DECL_EXTERNAL (x)
2080 && b != global_binding_level
2081 && x != IDENTIFIER_IMPLICIT_DECL (name)
2082 /* No error messages for __FUNCTION__ and __PRETTY_FUNCTION__. */
2083 && !DECL_IN_SYSTEM_HEADER (x))
2084 warning ("nested extern declaration of `%s'",
2085 IDENTIFIER_POINTER (name));
2087 t = lookup_name_current_level (name);
2088 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2090 t = IDENTIFIER_GLOBAL_VALUE (name);
2091 /* Type decls at global scope don't conflict with externs declared
2092 inside lexical blocks. */
2093 if (! t || TREE_CODE (t) == TYPE_DECL)
2094 /* If there's no visible global declaration, try for an
2096 t = IDENTIFIER_LIMBO_VALUE (name);
2097 different_binding_level = 1;
2099 if (t != 0 && t == error_mark_node)
2100 /* error_mark_node is 0 for a while during initialization! */
2103 error_with_decl (x, "`%s' used prior to declaration");
2106 /* If this decl is `static' and an implicit decl was seen previously,
2108 if (TREE_PUBLIC (name)
2109 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2110 sets this for all functions. */
2111 && ! TREE_PUBLIC (x)
2112 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2113 /* We used to warn also for explicit extern followed by static,
2114 but sometimes you need to do it that way. */
2115 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2117 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2118 IDENTIFIER_POINTER (name));
2119 pedwarn_with_file_and_line
2120 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2121 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2122 "previous declaration of `%s'",
2123 IDENTIFIER_POINTER (name));
2124 TREE_THIS_VOLATILE (name) = 1;
2127 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2129 if (TREE_CODE (t) == PARM_DECL)
2131 /* Don't allow more than one "real" duplicate
2132 of a forward parm decl. */
2133 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2139 /* If we are processing a typedef statement, generate a whole new
2140 ..._TYPE node (which will be just an variant of the existing
2141 ..._TYPE node with identical properties) and then install the
2142 TYPE_DECL node generated to represent the typedef name as the
2143 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2145 The whole point here is to end up with a situation where each
2146 and every ..._TYPE node the compiler creates will be uniquely
2147 associated with AT MOST one node representing a typedef name.
2148 This way, even though the compiler substitutes corresponding
2149 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2150 early on, later parts of the compiler can always do the reverse
2151 translation and get back the corresponding typedef name. For
2154 typedef struct S MY_TYPE;
2157 Later parts of the compiler might only know that `object' was of
2158 type `struct S' if it were not for code just below. With this
2159 code however, later parts of the compiler see something like:
2161 struct S' == struct S
2162 typedef struct S' MY_TYPE;
2165 And they can then deduce (from the node for type struct S') that
2166 the original object declaration was:
2170 Being able to do this is important for proper support of protoize,
2171 and also for generating precise symbolic debugging information
2172 which takes full account of the programmer's (typedef) vocabulary.
2174 Obviously, we don't want to generate a duplicate ..._TYPE node if
2175 the TYPE_DECL node that we are now processing really represents a
2176 standard built-in type.
2178 Since all standard types are effectively declared at line zero
2179 in the source file, we can easily check to see if we are working
2180 on a standard type by checking the current value of lineno. */
2182 if (TREE_CODE (x) == TYPE_DECL)
2184 if (DECL_SOURCE_LINE (x) == 0)
2186 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2187 TYPE_NAME (TREE_TYPE (x)) = x;
2189 else if (TREE_TYPE (x) != error_mark_node
2190 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2192 tree tt = TREE_TYPE (x);
2193 DECL_ORIGINAL_TYPE (x) = tt;
2194 tt = build_type_copy (tt);
2196 TREE_USED (tt) = TREE_USED (x);
2201 /* Multiple external decls of the same identifier ought to match.
2202 We get warnings about inline functions where they are defined.
2203 Avoid duplicate warnings where they are used. */
2205 && ! (TREE_CODE (x) == FUNCTION_DECL && DECL_INLINE (x)))
2209 if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2210 /* Decls in limbo are always extern, so no need to check that. */
2211 decl = IDENTIFIER_LIMBO_VALUE (name);
2215 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2216 /* If old decl is built-in, we already warned if we should. */
2217 && !DECL_BUILT_IN (decl))
2219 pedwarn_with_decl (x,
2220 "type mismatch with previous external decl");
2221 pedwarn_with_decl (decl, "previous external decl of `%s'");
2225 /* If a function has had an implicit declaration, and then is defined,
2226 make sure they are compatible. */
2228 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2229 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2230 && TREE_CODE (x) == FUNCTION_DECL
2231 && ! comptypes (TREE_TYPE (x),
2232 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2234 warning_with_decl (x, "type mismatch with previous implicit declaration");
2235 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2236 "previous implicit declaration of `%s'");
2239 /* This name is new in its binding level.
2240 Install the new declaration and return it. */
2241 if (b == global_binding_level)
2243 /* Install a global value. */
2245 /* If the first global decl has external linkage,
2246 warn if we later see static one. */
2247 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2248 TREE_PUBLIC (name) = 1;
2250 IDENTIFIER_GLOBAL_VALUE (name) = x;
2252 /* We no longer care about any previous block level declarations. */
2253 IDENTIFIER_LIMBO_VALUE (name) = 0;
2255 /* Don't forget if the function was used via an implicit decl. */
2256 if (IDENTIFIER_IMPLICIT_DECL (name)
2257 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2258 TREE_USED (x) = 1, TREE_USED (name) = 1;
2260 /* Don't forget if its address was taken in that way. */
2261 if (IDENTIFIER_IMPLICIT_DECL (name)
2262 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2263 TREE_ADDRESSABLE (x) = 1;
2265 /* Warn about mismatches against previous implicit decl. */
2266 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2267 /* If this real decl matches the implicit, don't complain. */
2268 && ! (TREE_CODE (x) == FUNCTION_DECL
2269 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2270 == integer_type_node)))
2271 pedwarn ("`%s' was previously implicitly declared to return `int'",
2272 IDENTIFIER_POINTER (name));
2274 /* If this decl is `static' and an `extern' was seen previously,
2275 that is erroneous. */
2276 if (TREE_PUBLIC (name)
2277 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2279 /* Okay to redeclare an ANSI built-in as static. */
2280 if (t != 0 && DECL_BUILT_IN (t))
2282 /* Okay to declare a non-ANSI built-in as anything. */
2283 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2285 /* Okay to have global type decl after an earlier extern
2286 declaration inside a lexical block. */
2287 else if (TREE_CODE (x) == TYPE_DECL)
2289 else if (IDENTIFIER_IMPLICIT_DECL (name))
2291 if (! TREE_THIS_VOLATILE (name))
2292 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2293 IDENTIFIER_POINTER (name));
2296 pedwarn ("`%s' was declared `extern' and later `static'",
2297 IDENTIFIER_POINTER (name));
2302 /* Here to install a non-global value. */
2303 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2304 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2306 IDENTIFIER_LOCAL_VALUE (name) = x;
2308 /* If this is an extern function declaration, see if we
2309 have a global definition or declaration for the function. */
2312 && TREE_CODE (x) == FUNCTION_DECL
2313 && TREE_CODE (oldglobal) == FUNCTION_DECL
2314 && DECL_EXTERNAL (x)
2315 && ! DECL_DECLARED_INLINE_P (x))
2317 /* We have one. Their types must agree. */
2318 if (! comptypes (TREE_TYPE (x),
2319 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2320 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2323 /* Inner extern decl is inline if global one is.
2324 Copy enough to really inline it. */
2325 if (DECL_DECLARED_INLINE_P (oldglobal))
2327 DECL_DECLARED_INLINE_P (x)
2328 = DECL_DECLARED_INLINE_P (oldglobal);
2329 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2330 DECL_INITIAL (x) = (current_function_decl == oldglobal
2331 ? 0 : DECL_INITIAL (oldglobal));
2332 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2333 DECL_NUM_STMTS (x) = DECL_NUM_STMTS (oldglobal);
2334 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2335 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2336 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2337 DECL_ABSTRACT_ORIGIN (x)
2338 = DECL_ABSTRACT_ORIGIN (oldglobal);
2340 /* Inner extern decl is built-in if global one is. */
2341 if (DECL_BUILT_IN (oldglobal))
2343 DECL_BUILT_IN_CLASS (x) = DECL_BUILT_IN_CLASS (oldglobal);
2344 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2346 /* Keep the arg types from a file-scope fcn defn. */
2347 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2348 && DECL_INITIAL (oldglobal)
2349 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2350 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2355 /* This case is probably sometimes the right thing to do. */
2356 /* If we have a local external declaration,
2357 then any file-scope declaration should not
2358 have been static. */
2359 if (oldlocal == 0 && oldglobal != 0
2360 && !TREE_PUBLIC (oldglobal)
2361 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2362 warning ("`%s' locally external but globally static",
2363 IDENTIFIER_POINTER (name));
2366 /* If we have a local external declaration,
2367 and no file-scope declaration has yet been seen,
2368 then if we later have a file-scope decl it must not be static. */
2370 && DECL_EXTERNAL (x)
2374 TREE_PUBLIC (name) = 1;
2376 /* Save this decl, so that we can do type checking against
2377 other decls after it falls out of scope.
2379 Only save it once. This prevents temporary decls created in
2380 expand_inline_function from being used here, since this
2381 will have been set when the inline function was parsed.
2382 It also helps give slightly better warnings. */
2383 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2384 IDENTIFIER_LIMBO_VALUE (name) = x;
2387 warn_if_shadowing (x, oldlocal);
2389 /* If storing a local value, there may already be one (inherited).
2390 If so, record it for restoration when this binding level ends. */
2392 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2395 /* Keep count of variables in this level with incomplete type.
2396 If the input is erroneous, we can have error_mark in the type
2397 slot (e.g. "f(void a, ...)") - that doesn't count as an
2399 if (TREE_TYPE (x) != error_mark_node
2400 && !COMPLETE_TYPE_P (TREE_TYPE (x)))
2402 tree element = TREE_TYPE (x);
2404 while (TREE_CODE (element) == ARRAY_TYPE)
2405 element = TREE_TYPE (element);
2406 if (TREE_CODE (element) == RECORD_TYPE
2407 || TREE_CODE (element) == UNION_TYPE)
2412 /* Put decls on list in reverse order.
2413 We will reverse them later if necessary. */
2414 TREE_CHAIN (x) = b->names;
2420 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2423 pushdecl_top_level (x)
2427 struct binding_level *b = current_binding_level;
2429 current_binding_level = global_binding_level;
2431 current_binding_level = b;
2435 /* Generate an implicit declaration for identifier FUNCTIONID
2436 as a function of type int (). Print a warning if appropriate. */
2439 implicitly_declare (functionid)
2443 int traditional_warning = 0;
2444 /* Only one "implicit declaration" warning per identifier. */
2445 int implicit_warning;
2447 /* We used to reuse an old implicit decl here,
2448 but this loses with inline functions because it can clobber
2449 the saved decl chains. */
2451 if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2452 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2455 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2457 /* Warn of implicit decl following explicit local extern decl.
2458 This is probably a program designed for traditional C. */
2459 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2460 traditional_warning = 1;
2462 /* Warn once of an implicit declaration. */
2463 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2465 DECL_EXTERNAL (decl) = 1;
2466 TREE_PUBLIC (decl) = 1;
2468 /* Record that we have an implicit decl and this is it. */
2469 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2471 /* ANSI standard says implicit declarations are in the innermost block.
2472 So we record the decl in the standard fashion. */
2475 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2476 maybe_objc_check_decl (decl);
2478 rest_of_decl_compilation (decl, NULL, 0, 0);
2480 if (implicit_warning)
2481 implicit_decl_warning (functionid);
2482 else if (warn_traditional && traditional_warning)
2483 warning ("function `%s' was previously declared within a block",
2484 IDENTIFIER_POINTER (functionid));
2486 /* Write a record describing this implicit function declaration to the
2487 prototypes file (if requested). */
2489 gen_aux_info_record (decl, 0, 1, 0);
2491 /* Possibly apply some default attributes to this implicit declaration. */
2492 decl_attributes (&decl, NULL_TREE, 0);
2498 implicit_decl_warning (id)
2501 const char *name = IDENTIFIER_POINTER (id);
2502 if (mesg_implicit_function_declaration == 2)
2503 error ("implicit declaration of function `%s'", name);
2504 else if (mesg_implicit_function_declaration == 1)
2505 warning ("implicit declaration of function `%s'", name);
2508 /* Return zero if the declaration NEWDECL is valid
2509 when the declaration OLDDECL (assumed to be for the same name)
2510 has already been seen.
2511 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2512 and 3 if it is a conflicting declaration. */
2515 redeclaration_error_message (newdecl, olddecl)
2516 tree newdecl, olddecl;
2518 if (TREE_CODE (newdecl) == TYPE_DECL)
2520 /* Do not complain about type redeclarations where at least one
2521 declaration was in a system header. */
2522 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2526 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2528 /* Declarations of functions can insist on internal linkage
2529 but they can't be inconsistent with internal linkage,
2530 so there can be no error on that account.
2531 However defining the same name twice is no good. */
2532 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2533 /* However, defining once as extern inline and a second
2534 time in another way is ok. */
2535 && ! (DECL_DECLARED_INLINE_P (olddecl) && DECL_EXTERNAL (olddecl)
2536 && ! (DECL_DECLARED_INLINE_P (newdecl)
2537 && DECL_EXTERNAL (newdecl))))
2541 else if (DECL_CONTEXT (newdecl) == NULL_TREE)
2543 /* Objects declared at top level: */
2544 /* If at least one is a reference, it's ok. */
2545 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2547 /* Reject two definitions. */
2548 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2550 /* Now we have two tentative defs, or one tentative and one real def. */
2551 /* Insist that the linkage match. */
2552 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2556 else if (current_binding_level->parm_flag
2557 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2561 /* Newdecl has block scope. If olddecl has block scope also, then
2562 reject two definitions, and reject a definition together with an
2563 external reference. Otherwise, it is OK, because newdecl must
2564 be an extern reference to olddecl. */
2565 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2566 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2572 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2573 Create one if none exists so far for the current function.
2574 This function is called for both label definitions and label references. */
2580 tree decl = IDENTIFIER_LABEL_VALUE (id);
2582 if (current_function_decl == 0)
2584 error ("label %s referenced outside of any function",
2585 IDENTIFIER_POINTER (id));
2589 /* Use a label already defined or ref'd with this name. */
2592 /* But not if it is inherited and wasn't declared to be inheritable. */
2593 if (DECL_CONTEXT (decl) != current_function_decl
2594 && ! C_DECLARED_LABEL_FLAG (decl))
2595 return shadow_label (id);
2599 decl = build_decl (LABEL_DECL, id, void_type_node);
2601 /* A label not explicitly declared must be local to where it's ref'd. */
2602 DECL_CONTEXT (decl) = current_function_decl;
2604 DECL_MODE (decl) = VOIDmode;
2606 /* Say where one reference is to the label,
2607 for the sake of the error if it is not defined. */
2608 DECL_SOURCE_LINE (decl) = lineno;
2609 DECL_SOURCE_FILE (decl) = input_filename;
2611 IDENTIFIER_LABEL_VALUE (id) = decl;
2613 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2618 /* Make a label named NAME in the current function,
2619 shadowing silently any that may be inherited from containing functions
2620 or containing scopes.
2622 Note that valid use, if the label being shadowed
2623 comes from another scope in the same function,
2624 requires calling declare_nonlocal_label right away. */
2630 tree decl = IDENTIFIER_LABEL_VALUE (name);
2636 /* Check to make sure that the label hasn't already been declared
2637 at this label scope */
2638 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2639 if (TREE_VALUE (dup) == decl)
2641 error ("duplicate label declaration `%s'",
2642 IDENTIFIER_POINTER (name));
2643 error_with_decl (TREE_VALUE (dup),
2644 "this is a previous declaration");
2645 /* Just use the previous declaration. */
2646 return lookup_label (name);
2649 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2650 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2653 return lookup_label (name);
2656 /* Define a label, specifying the location in the source file.
2657 Return the LABEL_DECL node for the label, if the definition is valid.
2658 Otherwise return 0. */
2661 define_label (filename, line, name)
2662 const char *filename;
2666 tree decl = lookup_label (name);
2668 /* If label with this name is known from an outer context, shadow it. */
2669 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2671 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2672 IDENTIFIER_LABEL_VALUE (name) = 0;
2673 decl = lookup_label (name);
2676 if (warn_traditional && !in_system_header && lookup_name (name))
2677 warning_with_file_and_line (filename, line,
2678 "traditional C lacks a separate namespace for labels, identifier `%s' conflicts",
2679 IDENTIFIER_POINTER (name));
2681 if (DECL_INITIAL (decl) != 0)
2683 error_with_file_and_line (filename, line, "duplicate label `%s'",
2684 IDENTIFIER_POINTER (name));
2689 /* Mark label as having been defined. */
2690 DECL_INITIAL (decl) = error_mark_node;
2691 /* Say where in the source. */
2692 DECL_SOURCE_FILE (decl) = filename;
2693 DECL_SOURCE_LINE (decl) = line;
2698 /* Return the list of declarations of the current level.
2699 Note that this list is in reverse order unless/until
2700 you nreverse it; and when you do nreverse it, you must
2701 store the result back using `storedecls' or you will lose. */
2706 return current_binding_level->names;
2709 /* Return the list of type-tags (for structs, etc) of the current level. */
2714 return current_binding_level->tags;
2717 /* Store the list of declarations of the current level.
2718 This is done for the parameter declarations of a function being defined,
2719 after they are modified in the light of any missing parameters. */
2725 current_binding_level->names = decls;
2728 /* Similarly, store the list of tags of the current level. */
2734 current_binding_level->tags = tags;
2737 /* Given NAME, an IDENTIFIER_NODE,
2738 return the structure (or union or enum) definition for that name.
2739 Searches binding levels from BINDING_LEVEL up to the global level.
2740 If THISLEVEL_ONLY is nonzero, searches only the specified context
2741 (but skips any tag-transparent contexts to find one that is
2742 meaningful for tags).
2743 CODE says which kind of type the caller wants;
2744 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2745 If the wrong kind of type is found, an error is reported. */
2748 lookup_tag (code, name, binding_level, thislevel_only)
2749 enum tree_code code;
2750 struct binding_level *binding_level;
2754 struct binding_level *level;
2757 for (level = binding_level; level; level = level->level_chain)
2760 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2762 if (TREE_PURPOSE (tail) == name)
2764 if (TREE_CODE (TREE_VALUE (tail)) != code)
2766 /* Definition isn't the kind we were looking for. */
2767 pending_invalid_xref = name;
2768 pending_invalid_xref_file = input_filename;
2769 pending_invalid_xref_line = lineno;
2770 /* If in the same binding level as a declaration as a tag
2771 of a different type, this must not be allowed to
2772 shadow that tag, so give the error immediately.
2773 (For example, "struct foo; union foo;" is invalid.) */
2775 pending_xref_error ();
2777 return TREE_VALUE (tail);
2780 if (! level->tag_transparent)
2790 /* Print an error message now
2791 for a recent invalid struct, union or enum cross reference.
2792 We don't print them immediately because they are not invalid
2793 when used in the `struct foo;' construct for shadowing. */
2796 pending_xref_error ()
2798 if (pending_invalid_xref != 0)
2799 error_with_file_and_line (pending_invalid_xref_file,
2800 pending_invalid_xref_line,
2801 "`%s' defined as wrong kind of tag",
2802 IDENTIFIER_POINTER (pending_invalid_xref));
2803 pending_invalid_xref = 0;
2806 /* Given a type, find the tag that was defined for it and return the tag name.
2807 Otherwise return 0. */
2810 lookup_tag_reverse (type)
2813 struct binding_level *level;
2815 for (level = current_binding_level; level; level = level->level_chain)
2818 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2820 if (TREE_VALUE (tail) == type)
2821 return TREE_PURPOSE (tail);
2827 /* Look up NAME in the current binding level and its superiors
2828 in the namespace of variables, functions and typedefs.
2829 Return a ..._DECL node of some kind representing its definition,
2830 or return 0 if it is undefined. */
2838 if (current_binding_level != global_binding_level
2839 && IDENTIFIER_LOCAL_VALUE (name))
2840 val = IDENTIFIER_LOCAL_VALUE (name);
2842 val = IDENTIFIER_GLOBAL_VALUE (name);
2846 /* Similar to `lookup_name' but look only at current binding level. */
2849 lookup_name_current_level (name)
2854 if (current_binding_level == global_binding_level)
2855 return IDENTIFIER_GLOBAL_VALUE (name);
2857 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2860 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2861 if (DECL_NAME (t) == name)
2867 /* Mark ARG for GC. */
2870 mark_binding_level (arg)
2873 struct binding_level *level = *(struct binding_level **) arg;
2875 for (; level != 0; level = level->level_chain)
2877 ggc_mark_tree (level->names);
2878 ggc_mark_tree (level->tags);
2879 ggc_mark_tree (level->shadowed);
2880 ggc_mark_tree (level->blocks);
2881 ggc_mark_tree (level->this_block);
2882 ggc_mark_tree (level->parm_order);
2886 /* Create the predefined scalar types of C,
2887 and some nodes representing standard constants (0, 1, (void *) 0).
2888 Initialize the global binding level.
2889 Make definitions for built-in primitive functions. */
2892 c_init_decl_processing ()
2895 tree ptr_ftype_void, ptr_ftype_ptr;
2897 /* Adds some ggc roots, and reserved words for c-parse.in. */
2900 current_function_decl = NULL;
2901 named_labels = NULL;
2902 current_binding_level = NULL_BINDING_LEVEL;
2903 free_binding_level = NULL_BINDING_LEVEL;
2905 /* Make the binding_level structure for global names. */
2907 global_binding_level = current_binding_level;
2909 build_common_tree_nodes (flag_signed_char);
2911 c_common_nodes_and_builtins ();
2913 boolean_type_node = integer_type_node;
2914 boolean_true_node = integer_one_node;
2915 boolean_false_node = integer_zero_node;
2917 c_bool_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
2918 TREE_SET_CODE (c_bool_type_node, BOOLEAN_TYPE);
2919 TYPE_MAX_VALUE (c_bool_type_node) = build_int_2 (1, 0);
2920 TREE_TYPE (TYPE_MAX_VALUE (c_bool_type_node)) = c_bool_type_node;
2921 TYPE_PRECISION (c_bool_type_node) = 1;
2922 pushdecl (build_decl (TYPE_DECL, get_identifier ("_Bool"),
2924 c_bool_false_node = build_int_2 (0, 0);
2925 TREE_TYPE (c_bool_false_node) = c_bool_type_node;
2926 c_bool_true_node = build_int_2 (1, 0);
2927 TREE_TYPE (c_bool_true_node) = c_bool_type_node;
2929 endlink = void_list_node;
2930 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
2932 = build_function_type (ptr_type_node,
2933 tree_cons (NULL_TREE, ptr_type_node, endlink));
2935 pedantic_lvalues = pedantic;
2937 make_fname_decl = c_make_fname_decl;
2938 start_fname_decls ();
2940 /* Record our roots. */
2942 ggc_add_tree_root (c_global_trees, CTI_MAX);
2943 ggc_add_root (&c_stmt_tree, 1, sizeof c_stmt_tree, mark_stmt_tree);
2944 ggc_add_tree_root (&c_scope_stmt_stack, 1);
2945 ggc_add_tree_root (&named_labels, 1);
2946 ggc_add_tree_root (&shadowed_labels, 1);
2947 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
2948 mark_binding_level);
2949 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
2950 mark_binding_level);
2951 ggc_add_tree_root (&static_ctors, 1);
2952 ggc_add_tree_root (&static_dtors, 1);
2955 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2956 decl, NAME is the initialization string and TYPE_DEP indicates whether
2957 NAME depended on the type of the function. As we don't yet implement
2958 delayed emission of static data, we mark the decl as emitted
2959 so it is not placed in the output. Anything using it must therefore pull
2960 out the STRING_CST initializer directly. This does mean that these names
2961 are string merging candidates, which is wrong for C99's __func__. FIXME. */
2964 c_make_fname_decl (id, type_dep)
2968 const char *name = fname_as_string (type_dep);
2969 tree decl, type, init;
2970 size_t length = strlen (name);
2972 type = build_array_type
2973 (build_qualified_type (char_type_node, TYPE_QUAL_CONST),
2974 build_index_type (size_int (length)));
2976 decl = build_decl (VAR_DECL, id, type);
2977 /* We don't push the decl, so have to set its context here. */
2978 DECL_CONTEXT (decl) = current_function_decl;
2980 TREE_STATIC (decl) = 1;
2981 TREE_READONLY (decl) = 1;
2982 DECL_ARTIFICIAL (decl) = 1;
2984 init = build_string (length + 1, name);
2985 TREE_TYPE (init) = type;
2986 DECL_INITIAL (decl) = init;
2988 TREE_USED (decl) = 1;
2990 finish_decl (decl, init, NULL_TREE);
2995 /* Return a definition for a builtin function named NAME and whose data type
2996 is TYPE. TYPE should be a function type with argument types.
2997 FUNCTION_CODE tells later passes how to compile calls to this function.
2998 See tree.h for its possible values.
3000 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3001 the name to be called if we can't opencode the function. */
3004 builtin_function (name, type, function_code, class, library_name)
3008 enum built_in_class class;
3009 const char *library_name;
3011 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3012 DECL_EXTERNAL (decl) = 1;
3013 TREE_PUBLIC (decl) = 1;
3015 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (library_name));
3016 make_decl_rtl (decl, NULL);
3018 DECL_BUILT_IN_CLASS (decl) = class;
3019 DECL_FUNCTION_CODE (decl) = function_code;
3021 /* The return builtins leave the current function. */
3022 if (function_code == BUILT_IN_RETURN || function_code == BUILT_IN_EH_RETURN)
3023 TREE_THIS_VOLATILE (decl) = 1;
3025 /* Warn if a function in the namespace for users
3026 is used without an occasion to consider it declared. */
3027 if (name[0] != '_' || name[1] != '_')
3028 C_DECL_ANTICIPATED (decl) = 1;
3030 /* Possibly apply some default attributes to this built-in function. */
3031 decl_attributes (&decl, NULL_TREE, 0);
3036 /* Apply default attributes to a function, if a system function with default
3040 c_insert_default_attributes (decl)
3043 if (!TREE_PUBLIC (decl))
3045 c_common_insert_default_attributes (decl);
3048 /* Called when a declaration is seen that contains no names to declare.
3049 If its type is a reference to a structure, union or enum inherited
3050 from a containing scope, shadow that tag name for the current scope
3051 with a forward reference.
3052 If its type defines a new named structure or union
3053 or defines an enum, it is valid but we need not do anything here.
3054 Otherwise, it is an error. */
3057 shadow_tag (declspecs)
3060 shadow_tag_warned (declspecs, 0);
3064 shadow_tag_warned (declspecs, warned)
3067 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3074 pending_invalid_xref = 0;
3076 /* Remove the attributes from declspecs, since they will confuse the
3078 split_specs_attrs (declspecs, &specs, &attrs);
3080 for (link = specs; link; link = TREE_CHAIN (link))
3082 tree value = TREE_VALUE (link);
3083 enum tree_code code = TREE_CODE (value);
3085 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3086 /* Used to test also that TYPE_SIZE (value) != 0.
3087 That caused warning for `struct foo;' at top level in the file. */
3089 tree name = lookup_tag_reverse (value);
3096 if (warned != 1 && code != ENUMERAL_TYPE)
3097 /* Empty unnamed enum OK */
3099 pedwarn ("unnamed struct/union that defines no instances");
3105 t = lookup_tag (code, name, current_binding_level, 1);
3109 t = make_node (code);
3116 if (!warned && ! in_system_header)
3118 warning ("useless keyword or type name in empty declaration");
3125 error ("two types specified in one empty declaration");
3130 pedwarn ("empty declaration");
3134 /* Construct an array declarator. EXPR is the expression inside [], or
3135 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
3136 to the pointer to which a parameter array is converted). STATIC_P is
3137 non-zero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
3138 is non-zero is the array is [*], a VLA of unspecified length which is
3139 nevertheless a complete type (not currently implemented by GCC),
3140 zero otherwise. The declarator is constructed as an ARRAY_REF
3141 (to be decoded by grokdeclarator), whose operand 0 is what's on the
3142 left of the [] (filled by in set_array_declarator_type) and operand 1
3143 is the expression inside; whose TREE_TYPE is the type qualifiers and
3144 which has TREE_STATIC set if "static" is used. */
3147 build_array_declarator (expr, quals, static_p, vla_unspec_p)
3154 decl = build_nt (ARRAY_REF, NULL_TREE, expr);
3155 TREE_TYPE (decl) = quals;
3156 TREE_STATIC (decl) = (static_p ? 1 : 0);
3157 if (pedantic && !flag_isoc99)
3159 if (static_p || quals != NULL_TREE)
3160 pedwarn ("ISO C89 does not support `static' or type qualifiers in parameter array declarators");
3162 pedwarn ("ISO C89 does not support `[*]' array declarators");
3165 warning ("GCC does not yet properly implement `[*]' array declarators");
3169 /* Set the type of an array declarator. DECL is the declarator, as
3170 constructed by build_array_declarator; TYPE is what appears on the left
3171 of the [] and goes in operand 0. ABSTRACT_P is non-zero if it is an
3172 abstract declarator, zero otherwise; this is used to reject static and
3173 type qualifiers in abstract declarators, where they are not in the
3177 set_array_declarator_type (decl, type, abstract_p)
3182 TREE_OPERAND (decl, 0) = type;
3183 if (abstract_p && (TREE_TYPE (decl) != NULL_TREE || TREE_STATIC (decl)))
3184 error ("static or type qualifiers in abstract declarator");
3188 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3191 groktypename (typename)
3196 if (TREE_CODE (typename) != TREE_LIST)
3199 split_specs_attrs (TREE_PURPOSE (typename), &specs, &attrs);
3201 typename = grokdeclarator (TREE_VALUE (typename), specs, TYPENAME, 0);
3203 /* Apply attributes. */
3204 decl_attributes (&typename, attrs, 0);
3209 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3212 groktypename_in_parm_context (typename)
3215 if (TREE_CODE (typename) != TREE_LIST)
3217 return grokdeclarator (TREE_VALUE (typename),
3218 TREE_PURPOSE (typename),
3222 /* Decode a declarator in an ordinary declaration or data definition.
3223 This is called as soon as the type information and variable name
3224 have been parsed, before parsing the initializer if any.
3225 Here we create the ..._DECL node, fill in its type,
3226 and put it on the list of decls for the current context.
3227 The ..._DECL node is returned as the value.
3229 Exception: for arrays where the length is not specified,
3230 the type is left null, to be filled in by `finish_decl'.
3232 Function definitions do not come here; they go to start_function
3233 instead. However, external and forward declarations of functions
3234 do go through here. Structure field declarations are done by
3235 grokfield and not through here. */
3238 start_decl (declarator, declspecs, initialized, attributes)
3239 tree declarator, declspecs;
3246 /* An object declared as __attribute__((deprecated)) suppresses
3247 warnings of uses of other deprecated items. */
3248 if (lookup_attribute ("deprecated", attributes))
3249 deprecated_state = DEPRECATED_SUPPRESS;
3251 decl = grokdeclarator (declarator, declspecs,
3252 NORMAL, initialized);
3254 deprecated_state = DEPRECATED_NORMAL;
3256 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3257 && MAIN_NAME_P (DECL_NAME (decl)))
3258 warning_with_decl (decl, "`%s' is usually a function");
3261 /* Is it valid for this decl to have an initializer at all?
3262 If not, set INITIALIZED to zero, which will indirectly
3263 tell `finish_decl' to ignore the initializer once it is parsed. */
3264 switch (TREE_CODE (decl))
3267 /* typedef foo = bar means give foo the same type as bar.
3268 We haven't parsed bar yet, so `finish_decl' will fix that up.
3269 Any other case of an initialization in a TYPE_DECL is an error. */
3270 if (pedantic || list_length (declspecs) > 1)
3272 error ("typedef `%s' is initialized",
3273 IDENTIFIER_POINTER (DECL_NAME (decl)));
3279 error ("function `%s' is initialized like a variable",
3280 IDENTIFIER_POINTER (DECL_NAME (decl)));
3285 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3286 error ("parameter `%s' is initialized",
3287 IDENTIFIER_POINTER (DECL_NAME (decl)));
3292 /* Don't allow initializations for incomplete types
3293 except for arrays which might be completed by the initialization. */
3295 /* This can happen if the array size is an undefined macro. We already
3296 gave a warning, so we don't need another one. */
3297 if (TREE_TYPE (decl) == error_mark_node)
3299 else if (COMPLETE_TYPE_P (TREE_TYPE (decl)))
3301 /* A complete type is ok if size is fixed. */
3303 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3304 || C_DECL_VARIABLE_SIZE (decl))
3306 error ("variable-sized object may not be initialized");
3310 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3312 error ("variable `%s' has initializer but incomplete type",
3313 IDENTIFIER_POINTER (DECL_NAME (decl)));
3316 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
3318 error ("elements of array `%s' have incomplete type",
3319 IDENTIFIER_POINTER (DECL_NAME (decl)));
3327 /* Seems redundant with grokdeclarator. */
3328 if (current_binding_level != global_binding_level
3329 && DECL_EXTERNAL (decl)
3330 && TREE_CODE (decl) != FUNCTION_DECL)
3331 warning ("declaration of `%s' has `extern' and is initialized",
3332 IDENTIFIER_POINTER (DECL_NAME (decl)));
3334 DECL_EXTERNAL (decl) = 0;
3335 if (current_binding_level == global_binding_level)
3336 TREE_STATIC (decl) = 1;
3338 /* Tell `pushdecl' this is an initialized decl
3339 even though we don't yet have the initializer expression.
3340 Also tell `finish_decl' it may store the real initializer. */
3341 DECL_INITIAL (decl) = error_mark_node;
3344 /* If this is a function declaration, write a record describing it to the
3345 prototypes file (if requested). */
3347 if (TREE_CODE (decl) == FUNCTION_DECL)
3348 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3350 /* ANSI specifies that a tentative definition which is not merged with
3351 a non-tentative definition behaves exactly like a definition with an
3352 initializer equal to zero. (Section 3.7.2)
3354 -fno-common gives strict ANSI behavior, though this tends to break
3355 a large body of code that grew up without this rule.
3357 Thread-local variables are never common, since there's no entrenched
3358 body of code to break, and it allows more efficient variable references
3359 in the presense of dynamic linking. */
3361 if (TREE_CODE (decl) == VAR_DECL
3363 && TREE_PUBLIC (decl)
3364 && !DECL_THREAD_LOCAL (decl)
3366 DECL_COMMON (decl) = 1;
3368 /* Set attributes here so if duplicate decl, will have proper attributes. */
3369 decl_attributes (&decl, attributes, 0);
3371 /* If #pragma weak was used, mark the decl weak now. */
3372 if (current_binding_level == global_binding_level)
3373 maybe_apply_pragma_weak (decl);
3375 if (TREE_CODE (decl) == FUNCTION_DECL
3376 && DECL_DECLARED_INLINE_P (decl)
3377 && DECL_UNINLINABLE (decl)
3378 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl)))
3379 warning_with_decl (decl,
3380 "inline function `%s' given attribute noinline");
3382 /* Add this decl to the current binding level.
3383 TEM may equal DECL or it may be a previous decl of the same name. */
3384 tem = pushdecl (decl);
3386 /* For a local variable, define the RTL now. */
3387 if (current_binding_level != global_binding_level
3388 /* But not if this is a duplicate decl
3389 and we preserved the rtl from the previous one
3390 (which may or may not happen). */
3391 && !DECL_RTL_SET_P (tem)
3392 && !DECL_CONTEXT (tem))
3394 if (TREE_TYPE (tem) != error_mark_node
3395 && COMPLETE_TYPE_P (TREE_TYPE (tem)))
3397 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3398 && DECL_INITIAL (tem) != 0)
3405 /* Finish processing of a declaration;
3406 install its initial value.
3407 If the length of an array type is not known before,
3408 it must be determined now, from the initial value, or it is an error. */
3411 finish_decl (decl, init, asmspec_tree)
3415 tree type = TREE_TYPE (decl);
3416 int was_incomplete = (DECL_SIZE (decl) == 0);
3417 const char *asmspec = 0;
3419 /* If a name was specified, get the string. */
3420 if (current_binding_level == global_binding_level)
3421 asmspec_tree = maybe_apply_renaming_pragma (decl, asmspec_tree);
3423 asmspec = TREE_STRING_POINTER (asmspec_tree);
3425 /* If `start_decl' didn't like having an initialization, ignore it now. */
3426 if (init != 0 && DECL_INITIAL (decl) == 0)
3429 /* Don't crash if parm is initialized. */
3430 if (TREE_CODE (decl) == PARM_DECL)
3435 if (TREE_CODE (decl) != TYPE_DECL)
3436 store_init_value (decl, init);
3439 /* typedef foo = bar; store the type of bar as the type of foo. */
3440 TREE_TYPE (decl) = TREE_TYPE (init);
3441 DECL_INITIAL (decl) = init = 0;
3445 /* Deduce size of array from initialization, if not already known */
3446 if (TREE_CODE (type) == ARRAY_TYPE
3447 && TYPE_DOMAIN (type) == 0
3448 && TREE_CODE (decl) != TYPE_DECL)
3451 = (TREE_STATIC (decl)
3452 /* Even if pedantic, an external linkage array
3453 may have incomplete type at first. */
3454 ? pedantic && !TREE_PUBLIC (decl)
3455 : !DECL_EXTERNAL (decl));
3457 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3459 /* Get the completed type made by complete_array_type. */
3460 type = TREE_TYPE (decl);
3463 error_with_decl (decl, "initializer fails to determine size of `%s'");
3465 else if (failure == 2)
3468 error_with_decl (decl, "array size missing in `%s'");
3469 /* If a `static' var's size isn't known,
3470 make it extern as well as static, so it does not get
3472 If it is not `static', then do not mark extern;
3473 finish_incomplete_decl will give it a default size
3474 and it will get allocated. */
3475 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3476 DECL_EXTERNAL (decl) = 1;
3479 /* TYPE_MAX_VALUE is always one less than the number of elements
3480 in the array, because we start counting at zero. Therefore,
3481 warn only if the value is less than zero. */
3482 else if (pedantic && TYPE_DOMAIN (type) != 0
3483 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3484 error_with_decl (decl, "zero or negative size array `%s'");
3486 layout_decl (decl, 0);
3489 if (TREE_CODE (decl) == VAR_DECL)
3491 if (DECL_SIZE (decl) == 0 && TREE_TYPE (decl) != error_mark_node
3492 && COMPLETE_TYPE_P (TREE_TYPE (decl)))
3493 layout_decl (decl, 0);
3495 if (DECL_SIZE (decl) == 0
3496 /* Don't give an error if we already gave one earlier. */
3497 && TREE_TYPE (decl) != error_mark_node
3498 && (TREE_STATIC (decl)
3500 /* A static variable with an incomplete type
3501 is an error if it is initialized.
3502 Also if it is not file scope.
3503 Otherwise, let it through, but if it is not `extern'
3504 then it may cause an error message later. */
3505 (DECL_INITIAL (decl) != 0
3506 || DECL_CONTEXT (decl) != 0)
3508 /* An automatic variable with an incomplete type
3510 !DECL_EXTERNAL (decl)))
3512 error_with_decl (decl, "storage size of `%s' isn't known");
3513 TREE_TYPE (decl) = error_mark_node;
3516 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3517 && DECL_SIZE (decl) != 0)
3519 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3520 constant_expression_warning (DECL_SIZE (decl));
3522 error_with_decl (decl, "storage size of `%s' isn't constant");
3525 if (TREE_USED (type))
3526 TREE_USED (decl) = 1;
3529 /* If this is a function and an assembler name is specified, it isn't
3530 builtin any more. Also reset DECL_RTL so we can give it its new
3532 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3534 DECL_BUILT_IN_CLASS (decl) = NOT_BUILT_IN;
3535 SET_DECL_RTL (decl, NULL_RTX);
3536 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3539 /* Output the assembler code and/or RTL code for variables and functions,
3540 unless the type is an undefined structure or union.
3541 If not, it will get done when the type is completed. */
3543 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3545 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3546 maybe_objc_check_decl (decl);
3548 if (!DECL_CONTEXT (decl))
3550 if (DECL_INITIAL (decl) == NULL_TREE
3551 || DECL_INITIAL (decl) == error_mark_node)
3552 /* Don't output anything
3553 when a tentative file-scope definition is seen.
3554 But at end of compilation, do output code for them. */
3555 DECL_DEFER_OUTPUT (decl) = 1;
3556 rest_of_decl_compilation (decl, asmspec,
3557 (DECL_CONTEXT (decl) == 0
3558 || TREE_ASM_WRITTEN (decl)), 0);
3562 /* This is a local variable. If there is an ASMSPEC, the
3563 user has requested that we handle it specially. */
3566 /* In conjunction with an ASMSPEC, the `register'
3567 keyword indicates that we should place the variable
3568 in a particular register. */
3569 if (DECL_REGISTER (decl))
3570 DECL_C_HARD_REGISTER (decl) = 1;
3572 /* If this is not a static variable, issue a warning.
3573 It doesn't make any sense to give an ASMSPEC for an
3574 ordinary, non-register local variable. Historically,
3575 GCC has accepted -- but ignored -- the ASMSPEC in
3577 if (TREE_CODE (decl) == VAR_DECL
3578 && !DECL_REGISTER (decl)
3579 && !TREE_STATIC (decl))
3580 warning_with_decl (decl,
3581 "ignoring asm-specifier for non-static local variable `%s'");
3583 SET_DECL_ASSEMBLER_NAME (decl, get_identifier (asmspec));
3586 if (TREE_CODE (decl) != FUNCTION_DECL)
3587 add_decl_stmt (decl);
3590 if (DECL_CONTEXT (decl) != 0)
3592 /* Recompute the RTL of a local array now
3593 if it used to be an incomplete type. */
3595 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3597 /* If we used it already as memory, it must stay in memory. */
3598 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3599 /* If it's still incomplete now, no init will save it. */
3600 if (DECL_SIZE (decl) == 0)
3601 DECL_INITIAL (decl) = 0;
3606 if (TREE_CODE (decl) == TYPE_DECL)
3608 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3609 maybe_objc_check_decl (decl);
3610 rest_of_decl_compilation (decl, NULL, DECL_CONTEXT (decl) == 0, 0);
3613 /* At the end of a declaration, throw away any variable type sizes
3614 of types defined inside that declaration. There is no use
3615 computing them in the following function definition. */
3616 if (current_binding_level == global_binding_level)
3617 get_pending_sizes ();
3620 /* Given a parsed parameter declaration,
3621 decode it into a PARM_DECL and push that on the current binding level.
3622 Also, for the sake of forward parm decls,
3623 record the given order of parms in `parm_order'. */
3626 push_parm_decl (parm)
3630 int old_immediate_size_expand = immediate_size_expand;
3631 /* Don't try computing parm sizes now -- wait till fn is called. */
3632 immediate_size_expand = 0;
3634 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3635 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3636 decl_attributes (&decl, TREE_VALUE (parm), 0);
3639 if (DECL_NAME (decl))
3642 olddecl = lookup_name (DECL_NAME (decl));
3643 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3644 pedwarn_with_decl (decl,
3645 "ISO C forbids parameter `%s' shadowing typedef");
3649 decl = pushdecl (decl);
3651 immediate_size_expand = old_immediate_size_expand;
3653 current_binding_level->parm_order
3654 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3656 /* Add this decl to the current binding level. */
3657 finish_decl (decl, NULL_TREE, NULL_TREE);
3660 /* Clear the given order of parms in `parm_order'.
3661 Used at start of parm list,
3662 and also at semicolon terminating forward decls. */
3667 current_binding_level->parm_order = NULL_TREE;
3670 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3671 literal, which may be an incomplete array type completed by the
3672 initializer; INIT is a CONSTRUCTOR that initializes the compound
3676 build_compound_literal (type, init)
3680 /* We do not use start_decl here because we have a type, not a declarator;
3681 and do not use finish_decl because the decl should be stored inside
3682 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3683 tree decl = build_decl (VAR_DECL, NULL_TREE, type);
3686 DECL_EXTERNAL (decl) = 0;
3687 TREE_PUBLIC (decl) = 0;
3688 TREE_STATIC (decl) = (current_binding_level == global_binding_level);
3689 DECL_CONTEXT (decl) = current_function_decl;
3690 TREE_USED (decl) = 1;
3691 TREE_TYPE (decl) = type;
3692 store_init_value (decl, init);
3694 if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
3696 int failure = complete_array_type (type, DECL_INITIAL (decl), 1);
3701 type = TREE_TYPE (decl);
3702 if (type == error_mark_node || !COMPLETE_TYPE_P (type))
3703 return error_mark_node;
3705 stmt = build_stmt (DECL_STMT, decl);
3706 complit = build1 (COMPOUND_LITERAL_EXPR, TREE_TYPE (decl), stmt);
3707 TREE_SIDE_EFFECTS (complit) = 1;
3709 layout_decl (decl, 0);
3711 if (TREE_STATIC (decl))
3713 /* This decl needs a name for the assembler output. We also need
3714 a unique suffix to be added to the name, for which DECL_CONTEXT
3716 DECL_NAME (decl) = get_identifier ("__compound_literal");
3717 DECL_CONTEXT (decl) = complit;
3718 rest_of_decl_compilation (decl, NULL, 1, 0);
3719 DECL_CONTEXT (decl) = NULL_TREE;
3725 /* Make TYPE a complete type based on INITIAL_VALUE.
3726 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3727 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3730 complete_array_type (type, initial_value, do_default)
3735 tree maxindex = NULL_TREE;
3740 /* Note MAXINDEX is really the maximum index,
3741 one less than the size. */
3742 if (TREE_CODE (initial_value) == STRING_CST)
3745 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3746 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3749 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3751 tree elts = CONSTRUCTOR_ELTS (initial_value);
3752 maxindex = build_int_2 (-1, -1);
3753 for (; elts; elts = TREE_CHAIN (elts))
3755 if (TREE_PURPOSE (elts))
3756 maxindex = TREE_PURPOSE (elts);
3758 maxindex = fold (build (PLUS_EXPR, integer_type_node,
3759 maxindex, integer_one_node));
3761 maxindex = copy_node (maxindex);
3765 /* Make an error message unless that happened already. */
3766 if (initial_value != error_mark_node)
3769 /* Prevent further error messages. */
3770 maxindex = build_int_2 (0, 0);
3777 maxindex = build_int_2 (0, 0);
3783 TYPE_DOMAIN (type) = build_index_type (maxindex);
3784 if (!TREE_TYPE (maxindex))
3785 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3788 /* Lay out the type now that we can get the real answer. */
3795 /* Given declspecs and a declarator,
3796 determine the name and type of the object declared
3797 and construct a ..._DECL node for it.
3798 (In one case we can return a ..._TYPE node instead.
3799 For invalid input we sometimes return 0.)
3801 DECLSPECS is a chain of tree_list nodes whose value fields
3802 are the storage classes and type specifiers.
3804 DECL_CONTEXT says which syntactic context this declaration is in:
3805 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3806 FUNCDEF for a function definition. Like NORMAL but a few different
3807 error messages in each case. Return value may be zero meaning
3808 this definition is too screwy to try to parse.
3809 PARM for a parameter declaration (either within a function prototype
3810 or before a function body). Make a PARM_DECL, or return void_type_node.
3811 TYPENAME if for a typename (in a cast or sizeof).
3812 Don't make a DECL node; just return the ..._TYPE node.
3813 FIELD for a struct or union field; make a FIELD_DECL.
3814 BITFIELD for a field with specified width.
3815 INITIALIZED is 1 if the decl has an initializer.
3817 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3818 It may also be so in the PARM case, for a prototype where the
3819 argument type is specified but not the name.
3821 This function is where the complicated C meanings of `static'
3822 and `extern' are interpreted. */
3825 grokdeclarator (declarator, declspecs, decl_context, initialized)
3828 enum decl_context decl_context;
3833 tree type = NULL_TREE;
3838 int type_quals = TYPE_UNQUALIFIED;
3840 int explicit_int = 0;
3841 int explicit_char = 0;
3842 int defaulted_int = 0;
3843 tree typedef_decl = 0;
3845 tree typedef_type = 0;
3846 int funcdef_flag = 0;
3847 enum tree_code innermost_code = ERROR_MARK;
3849 int size_varies = 0;
3850 tree decl_attr = NULL_TREE;
3851 tree array_ptr_quals = NULL_TREE;
3852 int array_parm_static = 0;
3853 tree returned_attrs = NULL_TREE;
3855 if (decl_context == BITFIELD)
3856 bitfield = 1, decl_context = FIELD;
3858 if (decl_context == FUNCDEF)
3859 funcdef_flag = 1, decl_context = NORMAL;
3861 /* Look inside a declarator for the name being declared
3862 and get it as a string, for an error message. */
3864 tree decl = declarator;
3868 switch (TREE_CODE (decl))
3873 innermost_code = TREE_CODE (decl);
3874 decl = TREE_OPERAND (decl, 0);
3878 decl = TREE_VALUE (decl);
3881 case IDENTIFIER_NODE:
3882 name = IDENTIFIER_POINTER (decl);
3893 /* A function definition's declarator must have the form of
3894 a function declarator. */
3896 if (funcdef_flag && innermost_code != CALL_EXPR)
3899 /* Anything declared one level down from the top level
3900 must be one of the parameters of a function
3901 (because the body is at least two levels down). */
3903 /* If this looks like a function definition, make it one,
3904 even if it occurs where parms are expected.
3905 Then store_parm_decls will reject it and not use it as a parm. */
3906 if (decl_context == NORMAL && !funcdef_flag
3907 && current_binding_level->parm_flag)
3908 decl_context = PARM;
3910 /* Look through the decl specs and record which ones appear.
3911 Some typespecs are defined as built-in typenames.
3912 Others, the ones that are modifiers of other types,
3913 are represented by bits in SPECBITS: set the bits for
3914 the modifiers that appear. Storage class keywords are also in SPECBITS.
3916 If there is a typedef name or a type, store the type in TYPE.
3917 This includes builtin typedefs such as `int'.
3919 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3920 and did not come from a user typedef.
3922 Set LONGLONG if `long' is mentioned twice. */
3924 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3926 tree id = TREE_VALUE (spec);
3928 /* If the entire declaration is itself tagged as deprecated then
3929 suppress reports of deprecated items. */
3930 if (id && TREE_DEPRECATED (id))
3932 if (deprecated_state != DEPRECATED_SUPPRESS)
3933 warn_deprecated_use (id);
3936 if (id == ridpointers[(int) RID_INT])
3938 if (id == ridpointers[(int) RID_CHAR])
3941 if (TREE_CODE (id) == IDENTIFIER_NODE && C_IS_RESERVED_WORD (id))
3943 enum rid i = C_RID_CODE (id);
3944 if ((int) i <= (int) RID_LAST_MODIFIER)
3946 if (i == RID_LONG && (specbits & (1 << (int) RID_LONG)))
3949 error ("`long long long' is too long for GCC");
3952 if (pedantic && !flag_isoc99 && ! in_system_header
3954 pedwarn ("ISO C89 does not support `long long'");
3958 else if (specbits & (1 << (int) i))
3959 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3961 /* Diagnose "__thread extern". Recall that this list
3962 is in the reverse order seen in the text. */
3964 && (specbits & (1 << (int) RID_EXTERN
3965 | 1 << (int) RID_STATIC)))
3967 if (specbits & 1 << (int) RID_EXTERN)
3968 error ("`__thread' before `extern'");
3970 error ("`__thread' before `static'");
3973 specbits |= 1 << (int) i;
3978 error ("two or more data types in declaration of `%s'", name);
3979 /* Actual typedefs come to us as TYPE_DECL nodes. */
3980 else if (TREE_CODE (id) == TYPE_DECL)
3982 if (TREE_TYPE (id) == error_mark_node)
3983 ; /* Allow the type to default to int to avoid cascading errors. */
3986 type = TREE_TYPE (id);
3987 decl_attr = DECL_ATTRIBUTES (id);
3991 /* Built-in types come as identifiers. */
3992 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3994 tree t = lookup_name (id);
3995 if (TREE_TYPE (t) == error_mark_node)
3997 else if (!t || TREE_CODE (t) != TYPE_DECL)
3998 error ("`%s' fails to be a typedef or built in type",
3999 IDENTIFIER_POINTER (id));
4002 type = TREE_TYPE (t);
4006 else if (TREE_CODE (id) != ERROR_MARK)
4013 typedef_type = type;
4015 size_varies = C_TYPE_VARIABLE_SIZE (type);
4017 /* No type at all: default to `int', and set DEFAULTED_INT
4018 because it was not a user-defined typedef. */
4022 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4023 | (1 << (int) RID_SIGNED)
4024 | (1 << (int) RID_UNSIGNED)
4025 | (1 << (int) RID_COMPLEX))))
4026 /* Don't warn about typedef foo = bar. */
4027 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4028 && ! in_system_header)
4030 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
4031 and this is a function, or if -Wimplicit; prefer the former
4032 warning since it is more explicit. */
4033 if ((warn_implicit_int || warn_return_type || flag_isoc99)
4035 warn_about_return_type = 1;
4036 else if (warn_implicit_int || flag_isoc99)
4037 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
4042 type = integer_type_node;
4045 /* Now process the modifiers that were specified
4046 and check for invalid combinations. */
4048 /* Long double is a special combination. */
4050 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4051 && TYPE_MAIN_VARIANT (type) == double_type_node)
4053 specbits &= ~(1 << (int) RID_LONG);
4054 type = long_double_type_node;
4057 /* Check all other uses of type modifiers. */
4059 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4060 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4064 if ((specbits & 1 << (int) RID_LONG)
4065 && (specbits & 1 << (int) RID_SHORT))
4066 error ("both long and short specified for `%s'", name);
4067 else if (((specbits & 1 << (int) RID_LONG)
4068 || (specbits & 1 << (int) RID_SHORT))
4070 error ("long or short specified with char for `%s'", name);
4071 else if (((specbits & 1 << (int) RID_LONG)
4072 || (specbits & 1 << (int) RID_SHORT))
4073 && TREE_CODE (type) == REAL_TYPE)
4075 static int already = 0;
4077 error ("long or short specified with floating type for `%s'", name);
4078 if (! already && ! pedantic)
4080 error ("the only valid combination is `long double'");
4084 else if ((specbits & 1 << (int) RID_SIGNED)
4085 && (specbits & 1 << (int) RID_UNSIGNED))
4086 error ("both signed and unsigned specified for `%s'", name);
4087 else if (TREE_CODE (type) != INTEGER_TYPE)
4088 error ("long, short, signed or unsigned invalid for `%s'", name);
4092 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4094 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4096 if (flag_pedantic_errors)
4101 /* Discard the type modifiers if they are invalid. */
4104 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4105 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4110 if ((specbits & (1 << (int) RID_COMPLEX))
4111 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4113 error ("complex invalid for `%s'", name);
4114 specbits &= ~(1 << (int) RID_COMPLEX);
4117 /* Decide whether an integer type is signed or not.
4118 Optionally treat bitfields as signed by default. */
4119 if (specbits & 1 << (int) RID_UNSIGNED
4120 || (bitfield && ! flag_signed_bitfields
4121 && (explicit_int || defaulted_int || explicit_char
4122 /* A typedef for plain `int' without `signed'
4123 can be controlled just like plain `int'. */
4124 || ! (typedef_decl != 0
4125 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4126 && TREE_CODE (type) != ENUMERAL_TYPE
4127 && !(specbits & 1 << (int) RID_SIGNED)))
4130 type = long_long_unsigned_type_node;
4131 else if (specbits & 1 << (int) RID_LONG)
4132 type = long_unsigned_type_node;
4133 else if (specbits & 1 << (int) RID_SHORT)
4134 type = short_unsigned_type_node;
4135 else if (type == char_type_node)
4136 type = unsigned_char_type_node;
4137 else if (typedef_decl)
4138 type = c_common_unsigned_type (type);
4140 type = unsigned_type_node;
4142 else if ((specbits & 1 << (int) RID_SIGNED)
4143 && type == char_type_node)
4144 type = signed_char_type_node;
4146 type = long_long_integer_type_node;
4147 else if (specbits & 1 << (int) RID_LONG)
4148 type = long_integer_type_node;
4149 else if (specbits & 1 << (int) RID_SHORT)
4150 type = short_integer_type_node;
4152 if (specbits & 1 << (int) RID_COMPLEX)
4154 if (pedantic && !flag_isoc99)
4155 pedwarn ("ISO C89 does not support complex types");
4156 /* If we just have "complex", it is equivalent to
4157 "complex double", but if any modifiers at all are specified it is
4158 the complex form of TYPE. E.g, "complex short" is
4159 "complex short int". */
4161 if (defaulted_int && ! longlong
4162 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4163 | (1 << (int) RID_SIGNED)
4164 | (1 << (int) RID_UNSIGNED))))
4167 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4168 type = complex_double_type_node;
4170 else if (type == integer_type_node)
4173 pedwarn ("ISO C does not support complex integer types");
4174 type = complex_integer_type_node;
4176 else if (type == float_type_node)
4177 type = complex_float_type_node;
4178 else if (type == double_type_node)
4179 type = complex_double_type_node;
4180 else if (type == long_double_type_node)
4181 type = complex_long_double_type_node;
4185 pedwarn ("ISO C does not support complex integer types");
4186 type = build_complex_type (type);
4190 /* Figure out the type qualifiers for the declaration. There are
4191 two ways a declaration can become qualified. One is something
4192 like `const int i' where the `const' is explicit. Another is
4193 something like `typedef const int CI; CI i' where the type of the
4194 declaration contains the `const'. */
4195 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4196 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4197 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4198 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4199 if (constp > 1 && ! flag_isoc99)
4200 pedwarn ("duplicate `const'");
4201 if (restrictp > 1 && ! flag_isoc99)
4202 pedwarn ("duplicate `restrict'");
4203 if (volatilep > 1 && ! flag_isoc99)
4204 pedwarn ("duplicate `volatile'");
4205 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4206 type = TYPE_MAIN_VARIANT (type);
4207 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4208 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4209 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4211 /* Warn if two storage classes are given. Default to `auto'. */
4216 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4217 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4218 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4219 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4220 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4222 /* "static __thread" and "extern __thread" are allowed. */
4223 if ((specbits & (1 << (int) RID_THREAD
4224 | 1 << (int) RID_STATIC
4225 | 1 << (int) RID_EXTERN)) == (1 << (int) RID_THREAD))
4228 /* Warn about storage classes that are invalid for certain
4229 kinds of declarations (parameters, typenames, etc.). */
4232 error ("multiple storage classes in declaration of `%s'", name);
4233 else if (funcdef_flag
4235 & ((1 << (int) RID_REGISTER)
4236 | (1 << (int) RID_AUTO)
4237 | (1 << (int) RID_TYPEDEF)
4238 | (1 << (int) RID_THREAD))))
4240 if (specbits & 1 << (int) RID_AUTO
4241 && (pedantic || current_binding_level == global_binding_level))
4242 pedwarn ("function definition declared `auto'");
4243 if (specbits & 1 << (int) RID_REGISTER)
4244 error ("function definition declared `register'");
4245 if (specbits & 1 << (int) RID_TYPEDEF)
4246 error ("function definition declared `typedef'");
4247 if (specbits & 1 << (int) RID_THREAD)
4248 error ("function definition declared `__thread'");
4249 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4250 | (1 << (int) RID_AUTO) | (1 << (int) RID_THREAD));
4252 else if (decl_context != NORMAL && nclasses > 0)
4254 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4258 switch (decl_context)
4261 error ("storage class specified for structure field `%s'",
4265 error ("storage class specified for parameter `%s'", name);
4268 error ("storage class specified for typename");
4271 specbits &= ~((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4272 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4273 | (1 << (int) RID_EXTERN) | (1 << (int) RID_THREAD));
4276 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4278 /* `extern' with initialization is invalid if not at top level. */
4279 if (current_binding_level == global_binding_level)
4280 warning ("`%s' initialized and declared `extern'", name);
4282 error ("`%s' has both `extern' and initializer", name);
4284 else if (current_binding_level == global_binding_level)
4286 if (specbits & 1 << (int) RID_AUTO)
4287 error ("top-level declaration of `%s' specifies `auto'", name);
4291 if (specbits & 1 << (int) RID_EXTERN && funcdef_flag)
4292 error ("nested function `%s' declared `extern'", name);
4293 else if ((specbits & (1 << (int) RID_THREAD
4294 | 1 << (int) RID_EXTERN
4295 | 1 << (int) RID_STATIC))
4296 == (1 << (int) RID_THREAD))
4298 error ("function-scope `%s' implicitly auto and declared `__thread'",
4300 specbits &= ~(1 << (int) RID_THREAD);
4305 /* Now figure out the structure of the declarator proper.
4306 Descend through it, creating more complex types, until we reach
4307 the declared identifier (or NULL_TREE, in an absolute declarator). */
4309 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4311 if (type == error_mark_node)
4313 declarator = TREE_OPERAND (declarator, 0);
4317 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4318 an INDIRECT_REF (for *...),
4319 a CALL_EXPR (for ...(...)),
4320 a TREE_LIST (for nested attributes),
4321 an identifier (for the name being declared)
4322 or a null pointer (for the place in an absolute declarator
4323 where the name was omitted).
4324 For the last two cases, we have just exited the loop.
4326 At this point, TYPE is the type of elements of an array,
4327 or for a function to return, or for a pointer to point to.
4328 After this sequence of ifs, TYPE is the type of the
4329 array or function or pointer, and DECLARATOR has had its
4330 outermost layer removed. */
4332 if (array_ptr_quals != NULL_TREE || array_parm_static)
4334 /* Only the innermost declarator (making a parameter be of
4335 array type which is converted to pointer type)
4336 may have static or type qualifiers. */
4337 error ("static or type qualifiers in non-parameter array declarator");
4338 array_ptr_quals = NULL_TREE;
4339 array_parm_static = 0;
4342 if (TREE_CODE (declarator) == TREE_LIST)
4344 /* We encode a declarator with embedded attributes using
4346 tree attrs = TREE_PURPOSE (declarator);
4349 declarator = TREE_VALUE (declarator);
4350 inner_decl = declarator;
4351 while (inner_decl != NULL_TREE
4352 && TREE_CODE (inner_decl) == TREE_LIST)
4353 inner_decl = TREE_VALUE (inner_decl);
4354 if (inner_decl == NULL_TREE
4355 || TREE_CODE (inner_decl) == IDENTIFIER_NODE)
4356 attr_flags |= (int) ATTR_FLAG_DECL_NEXT;
4357 else if (TREE_CODE (inner_decl) == CALL_EXPR)
4358 attr_flags |= (int) ATTR_FLAG_FUNCTION_NEXT;
4359 else if (TREE_CODE (inner_decl) == ARRAY_REF)
4360 attr_flags |= (int) ATTR_FLAG_ARRAY_NEXT;
4361 returned_attrs = decl_attributes (&type,
4362 chainon (returned_attrs, attrs),
4365 else if (TREE_CODE (declarator) == ARRAY_REF)
4367 tree itype = NULL_TREE;
4368 tree size = TREE_OPERAND (declarator, 1);
4369 /* The index is a signed object `sizetype' bits wide. */
4370 tree index_type = c_common_signed_type (sizetype);
4372 array_ptr_quals = TREE_TYPE (declarator);
4373 array_parm_static = TREE_STATIC (declarator);
4375 declarator = TREE_OPERAND (declarator, 0);
4377 /* Check for some types that there cannot be arrays of. */
4379 if (VOID_TYPE_P (type))
4381 error ("declaration of `%s' as array of voids", name);
4382 type = error_mark_node;
4385 if (TREE_CODE (type) == FUNCTION_TYPE)
4387 error ("declaration of `%s' as array of functions", name);
4388 type = error_mark_node;
4391 if (size == error_mark_node)
4392 type = error_mark_node;
4394 if (type == error_mark_node)
4397 /* If size was specified, set ITYPE to a range-type for that size.
4398 Otherwise, ITYPE remains null. finish_decl may figure it out
4399 from an initial value. */
4403 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4404 STRIP_TYPE_NOPS (size);
4406 if (! INTEGRAL_TYPE_P (TREE_TYPE (size)))
4408 error ("size of array `%s' has non-integer type", name);
4409 size = integer_one_node;
4412 if (pedantic && integer_zerop (size))
4413 pedwarn ("ISO C forbids zero-size array `%s'", name);
4415 if (TREE_CODE (size) == INTEGER_CST)
4417 constant_expression_warning (size);
4418 if (tree_int_cst_sgn (size) < 0)
4420 error ("size of array `%s' is negative", name);
4421 size = integer_one_node;
4426 /* Make sure the array size remains visibly nonconstant
4427 even if it is (eg) a const variable with known value. */
4430 if (!flag_isoc99 && pedantic)
4432 if (TREE_CONSTANT (size))
4433 pedwarn ("ISO C89 forbids array `%s' whose size can't be evaluated",
4436 pedwarn ("ISO C89 forbids variable-size array `%s'",
4441 if (integer_zerop (size))
4443 /* A zero-length array cannot be represented with an
4444 unsigned index type, which is what we'll get with
4445 build_index_type. Create an open-ended range instead. */
4446 itype = build_range_type (sizetype, size, NULL_TREE);
4450 /* Compute the maximum valid index, that is, size - 1.
4451 Do the calculation in index_type, so that if it is
4452 a variable the computations will be done in the
4454 itype = fold (build (MINUS_EXPR, index_type,
4455 convert (index_type, size),
4456 convert (index_type, size_one_node)));
4458 /* If that overflowed, the array is too big.
4459 ??? While a size of INT_MAX+1 technically shouldn't
4460 cause an overflow (because we subtract 1), the overflow
4461 is recorded during the conversion to index_type, before
4462 the subtraction. Handling this case seems like an
4463 unnecessary complication. */
4464 if (TREE_OVERFLOW (itype))
4466 error ("size of array `%s' is too large", name);
4467 type = error_mark_node;
4472 itype = variable_size (itype);
4473 itype = build_index_type (itype);
4476 else if (decl_context == FIELD)
4478 if (pedantic && !flag_isoc99 && !in_system_header)
4479 pedwarn ("ISO C89 does not support flexible array members");
4481 /* ISO C99 Flexible array members are effectively identical
4482 to GCC's zero-length array extension. */
4483 itype = build_range_type (sizetype, size_zero_node, NULL_TREE);
4486 /* If pedantic, complain about arrays of incomplete types. */
4488 if (pedantic && !COMPLETE_TYPE_P (type))
4489 pedwarn ("array type has incomplete element type");
4492 /* We shouldn't have a function type here at all!
4493 Functions aren't allowed as array elements. */
4494 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4495 && (constp || volatilep))
4496 pedwarn ("ISO C forbids const or volatile function types");
4499 /* Build the array type itself, then merge any constancy or
4500 volatility into the target type. We must do it in this order
4501 to ensure that the TYPE_MAIN_VARIANT field of the array type
4502 is set correctly. */
4504 type = build_array_type (type, itype);
4506 type = c_build_qualified_type (type, type_quals);
4509 C_TYPE_VARIABLE_SIZE (type) = 1;
4511 /* The GCC extension for zero-length arrays differs from
4512 ISO flexible array members in that sizeof yields zero. */
4513 if (size && integer_zerop (size))
4516 TYPE_SIZE (type) = bitsize_zero_node;
4517 TYPE_SIZE_UNIT (type) = size_zero_node;
4519 if (decl_context != PARM
4520 && (array_ptr_quals != NULL_TREE || array_parm_static))
4522 error ("static or type qualifiers in non-parameter array declarator");
4523 array_ptr_quals = NULL_TREE;
4524 array_parm_static = 0;
4527 else if (TREE_CODE (declarator) == CALL_EXPR)
4531 /* Declaring a function type.
4532 Make sure we have a valid type for the function to return. */
4533 if (type == error_mark_node)
4538 /* Warn about some types functions can't return. */
4540 if (TREE_CODE (type) == FUNCTION_TYPE)
4542 error ("`%s' declared as function returning a function", name);
4543 type = integer_type_node;
4545 if (TREE_CODE (type) == ARRAY_TYPE)
4547 error ("`%s' declared as function returning an array", name);
4548 type = integer_type_node;
4551 /* Construct the function type and go to the next
4552 inner layer of declarator. */
4554 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4556 /* Say it's a definition
4557 only for the CALL_EXPR
4558 closest to the identifier. */
4559 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4560 /* Type qualifiers before the return type of the function
4561 qualify the return type, not the function type. */
4564 /* Type qualifiers on a function return type are normally
4565 permitted by the standard but have no effect, so give a
4566 warning at -W. Qualifiers on a void return type have
4567 meaning as a GNU extension, and are banned on function
4568 definitions in ISO C. FIXME: strictly we shouldn't
4569 pedwarn for qualified void return types except on function
4570 definitions, but not doing so could lead to the undesirable
4571 state of a "volatile void" function return type not being
4572 warned about, and a use of the function being compiled
4573 with GNU semantics, with no diagnostics under -pedantic. */
4574 if (VOID_TYPE_P (type) && pedantic && !in_system_header)
4575 pedwarn ("ISO C forbids qualified void function return type");
4576 else if (extra_warnings
4577 && !(VOID_TYPE_P (type)
4578 && type_quals == TYPE_QUAL_VOLATILE))
4579 warning ("type qualifiers ignored on function return type");
4581 type = c_build_qualified_type (type, type_quals);
4583 type_quals = TYPE_UNQUALIFIED;
4585 type = build_function_type (type, arg_types);
4586 declarator = TREE_OPERAND (declarator, 0);
4588 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4589 the formal parameter list of this FUNCTION_TYPE to point to
4590 the FUNCTION_TYPE node itself. */
4595 for (link = last_function_parm_tags;
4597 link = TREE_CHAIN (link))
4598 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4601 else if (TREE_CODE (declarator) == INDIRECT_REF)
4603 /* Merge any constancy or volatility into the target type
4606 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4608 pedwarn ("ISO C forbids qualified function types");
4610 type = c_build_qualified_type (type, type_quals);
4611 type_quals = TYPE_UNQUALIFIED;
4614 type = build_pointer_type (type);
4616 /* Process a list of type modifier keywords
4617 (such as const or volatile) that were given inside the `*'. */
4619 if (TREE_TYPE (declarator))
4627 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4628 typemodlist = TREE_CHAIN (typemodlist))
4630 tree qualifier = TREE_VALUE (typemodlist);
4632 if (C_IS_RESERVED_WORD (qualifier))
4634 if (C_RID_CODE (qualifier) == RID_CONST)
4636 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4638 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4648 error ("invalid type modifier within pointer declarator");
4649 if (constp > 1 && ! flag_isoc99)
4650 pedwarn ("duplicate `const'");
4651 if (volatilep > 1 && ! flag_isoc99)
4652 pedwarn ("duplicate `volatile'");
4653 if (restrictp > 1 && ! flag_isoc99)
4654 pedwarn ("duplicate `restrict'");
4656 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4657 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4658 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4661 declarator = TREE_OPERAND (declarator, 0);
4668 /* Now TYPE has the actual type. */
4670 /* Did array size calculations overflow? */
4672 if (TREE_CODE (type) == ARRAY_TYPE
4673 && COMPLETE_TYPE_P (type)
4674 && TREE_OVERFLOW (TYPE_SIZE (type)))
4676 error ("size of array `%s' is too large", name);
4677 /* If we proceed with the array type as it is, we'll eventually
4678 crash in tree_low_cst(). */
4679 type = error_mark_node;
4682 /* If this is declaring a typedef name, return a TYPE_DECL. */
4684 if (specbits & (1 << (int) RID_TYPEDEF))
4687 /* Note that the grammar rejects storage classes
4688 in typenames, fields or parameters */
4689 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4691 pedwarn ("ISO C forbids qualified function types");
4693 type = c_build_qualified_type (type, type_quals);
4694 decl = build_decl (TYPE_DECL, declarator, type);
4695 if ((specbits & (1 << (int) RID_SIGNED))
4696 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4697 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4698 decl_attributes (&decl, returned_attrs, 0);
4702 /* Detect the case of an array type of unspecified size
4703 which came, as such, direct from a typedef name.
4704 We must copy the type, so that each identifier gets
4705 a distinct type, so that each identifier's size can be
4706 controlled separately by its own initializer. */
4708 if (type != 0 && typedef_type != 0
4709 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0
4710 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type))
4712 type = build_array_type (TREE_TYPE (type), 0);
4714 C_TYPE_VARIABLE_SIZE (type) = 1;
4717 /* If this is a type name (such as, in a cast or sizeof),
4718 compute the type and return it now. */
4720 if (decl_context == TYPENAME)
4722 /* Note that the grammar rejects storage classes
4723 in typenames, fields or parameters */
4724 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4726 pedwarn ("ISO C forbids const or volatile function types");
4728 type = c_build_qualified_type (type, type_quals);
4729 decl_attributes (&type, returned_attrs, 0);
4733 /* Aside from typedefs and type names (handle above),
4734 `void' at top level (not within pointer)
4735 is allowed only in public variables.
4736 We don't complain about parms either, but that is because
4737 a better error message can be made later. */
4739 if (VOID_TYPE_P (type) && decl_context != PARM
4740 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4741 && ((specbits & (1 << (int) RID_EXTERN))
4742 || (current_binding_level == global_binding_level
4744 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4746 error ("variable or field `%s' declared void", name);
4747 type = integer_type_node;
4750 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4751 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4756 if (decl_context == PARM)
4758 tree type_as_written;
4761 /* A parameter declared as an array of T is really a pointer to T.
4762 One declared as a function is really a pointer to a function. */
4764 if (TREE_CODE (type) == ARRAY_TYPE)
4766 /* Transfer const-ness of array into that of type pointed to. */
4767 type = TREE_TYPE (type);
4769 type = c_build_qualified_type (type, type_quals);
4770 type = build_pointer_type (type);
4771 type_quals = TYPE_UNQUALIFIED;
4772 if (array_ptr_quals)
4774 tree new_ptr_quals, new_ptr_attrs;
4776 split_specs_attrs (array_ptr_quals, &new_ptr_quals, &new_ptr_attrs);
4777 /* We don't yet implement attributes in this context. */
4778 if (new_ptr_attrs != NULL_TREE)
4779 warning ("attributes in parameter array declarator ignored");
4784 for (; new_ptr_quals; new_ptr_quals = TREE_CHAIN (new_ptr_quals))
4786 tree qualifier = TREE_VALUE (new_ptr_quals);
4788 if (C_IS_RESERVED_WORD (qualifier))
4790 if (C_RID_CODE (qualifier) == RID_CONST)
4792 else if (C_RID_CODE (qualifier) == RID_VOLATILE)
4794 else if (C_RID_CODE (qualifier) == RID_RESTRICT)
4804 error ("invalid type modifier within array declarator");
4806 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4807 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4808 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4812 else if (TREE_CODE (type) == FUNCTION_TYPE)
4814 if (pedantic && type_quals)
4815 pedwarn ("ISO C forbids qualified function types");
4817 type = c_build_qualified_type (type, type_quals);
4818 type = build_pointer_type (type);
4819 type_quals = TYPE_UNQUALIFIED;
4821 else if (type_quals)
4822 type = c_build_qualified_type (type, type_quals);
4824 type_as_written = type;
4826 decl = build_decl (PARM_DECL, declarator, type);
4828 C_DECL_VARIABLE_SIZE (decl) = 1;
4830 /* Compute the type actually passed in the parmlist,
4831 for the case where there is no prototype.
4832 (For example, shorts and chars are passed as ints.)
4833 When there is a prototype, this is overridden later. */
4835 if (type == error_mark_node)
4836 promoted_type = type;
4838 promoted_type = c_type_promotes_to (type);
4840 DECL_ARG_TYPE (decl) = promoted_type;
4841 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4843 else if (decl_context == FIELD)
4845 /* Structure field. It may not be a function. */
4847 if (TREE_CODE (type) == FUNCTION_TYPE)
4849 error ("field `%s' declared as a function", name);
4850 type = build_pointer_type (type);
4852 else if (TREE_CODE (type) != ERROR_MARK
4853 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type))
4855 error ("field `%s' has incomplete type", name);
4856 type = error_mark_node;
4858 /* Move type qualifiers down to element of an array. */
4859 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4861 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4863 TYPE_DOMAIN (type));
4865 /* Leave the field const or volatile as well. */
4866 type_quals = TYPE_UNQUALIFIED;
4869 decl = build_decl (FIELD_DECL, declarator, type);
4870 DECL_NONADDRESSABLE_P (decl) = bitfield;
4873 C_DECL_VARIABLE_SIZE (decl) = 1;
4875 else if (TREE_CODE (type) == FUNCTION_TYPE)
4877 /* Every function declaration is "external"
4878 except for those which are inside a function body
4879 in which `auto' is used.
4880 That is a case not specified by ANSI C,
4881 and we use it for forward declarations for nested functions. */
4882 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4883 || current_binding_level == global_binding_level);
4885 if (specbits & (1 << (int) RID_AUTO)
4886 && (pedantic || current_binding_level == global_binding_level))
4887 pedwarn ("invalid storage class for function `%s'", name);
4888 if (specbits & (1 << (int) RID_REGISTER))
4889 error ("invalid storage class for function `%s'", name);
4890 if (specbits & (1 << (int) RID_THREAD))
4891 error ("invalid storage class for function `%s'", name);
4892 /* Function declaration not at top level.
4893 Storage classes other than `extern' are not allowed
4894 and `extern' makes no difference. */
4895 if (current_binding_level != global_binding_level
4896 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4898 pedwarn ("invalid storage class for function `%s'", name);
4900 decl = build_decl (FUNCTION_DECL, declarator, type);
4901 decl = build_decl_attribute_variant (decl, decl_attr);
4903 DECL_LANG_SPECIFIC (decl) = (struct lang_decl *)
4904 ggc_alloc_cleared (sizeof (struct lang_decl));
4906 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4907 pedwarn ("ISO C forbids qualified function types");
4909 /* GNU C interprets a `volatile void' return type to indicate
4910 that the function does not return. */
4911 if ((type_quals & TYPE_QUAL_VOLATILE)
4912 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl))))
4913 warning ("`noreturn' function returns non-void value");
4916 DECL_EXTERNAL (decl) = 1;
4917 /* Record absence of global scope for `static' or `auto'. */
4919 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4922 C_FUNCTION_IMPLICIT_INT (decl) = 1;
4924 /* Record presence of `inline', if it is reasonable. */
4925 if (MAIN_NAME_P (declarator))
4928 warning ("cannot inline function `main'");
4932 /* Assume that otherwise the function can be inlined. */
4933 DECL_DECLARED_INLINE_P (decl) = 1;
4935 /* Do not mark bare declarations as DECL_INLINE. Doing so
4936 in the presence of multiple declarations can result in
4937 the abstract origin pointing between the declarations,
4938 which will confuse dwarf2out. */
4941 DECL_INLINE (decl) = 1;
4942 if (specbits & (1 << (int) RID_EXTERN))
4943 current_extern_inline = 1;
4946 /* If -finline-functions, assume it can be inlined. This does
4947 two things: let the function be deferred until it is actually
4948 needed, and let dwarf2 know that the function is inlinable. */
4949 else if (flag_inline_trees == 2 && initialized)
4951 DECL_INLINE (decl) = 1;
4952 DECL_DECLARED_INLINE_P (decl) = 0;
4957 /* It's a variable. */
4958 /* An uninitialized decl with `extern' is a reference. */
4959 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4961 /* Move type qualifiers down to element of an array. */
4962 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4964 int saved_align = TYPE_ALIGN(type);
4965 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4967 TYPE_DOMAIN (type));
4968 TYPE_ALIGN (type) = saved_align;
4969 #if 0 /* Leave the variable const or volatile as well. */
4970 type_quals = TYPE_UNQUALIFIED;
4973 else if (type_quals)
4974 type = c_build_qualified_type (type, type_quals);
4976 decl = build_decl (VAR_DECL, declarator, type);
4978 C_DECL_VARIABLE_SIZE (decl) = 1;
4981 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4983 DECL_EXTERNAL (decl) = extern_ref;
4985 /* At top level, the presence of a `static' or `register' storage
4986 class specifier, or the absence of all storage class specifiers
4987 makes this declaration a definition (perhaps tentative). Also,
4988 the absence of both `static' and `register' makes it public. */
4989 if (current_binding_level == global_binding_level)
4991 TREE_PUBLIC (decl) = !(specbits & ((1 << (int) RID_STATIC)
4992 | (1 << (int) RID_REGISTER)));
4993 TREE_STATIC (decl) = !extern_ref;
4995 /* Not at top level, only `static' makes a static definition. */
4998 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4999 TREE_PUBLIC (decl) = extern_ref;
5002 if (specbits & 1 << (int) RID_THREAD)
5004 if (targetm.have_tls)
5005 DECL_THREAD_LOCAL (decl) = 1;
5007 /* A mere warning is sure to result in improper semantics
5008 at runtime. Don't bother to allow this to compile. */
5009 error ("thread-local storage not supported for this target");
5013 /* Record `register' declaration for warnings on &
5014 and in case doing stupid register allocation. */
5016 if (specbits & (1 << (int) RID_REGISTER))
5017 DECL_REGISTER (decl) = 1;
5019 /* Record constancy and volatility. */
5020 c_apply_type_quals_to_decl (type_quals, decl);
5022 /* If a type has volatile components, it should be stored in memory.
5023 Otherwise, the fact that those components are volatile
5024 will be ignored, and would even crash the compiler. */
5025 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5026 c_mark_addressable (decl);
5028 decl_attributes (&decl, returned_attrs, 0);
5034 /* Decode the parameter-list info for a function type or function definition.
5035 The argument is the value returned by `get_parm_info' (or made in parse.y
5036 if there is an identifier list instead of a parameter decl list).
5037 These two functions are separate because when a function returns
5038 or receives functions then each is called multiple times but the order
5039 of calls is different. The last call to `grokparms' is always the one
5040 that contains the formal parameter names of a function definition.
5042 Store in `last_function_parms' a chain of the decls of parms.
5043 Also store in `last_function_parm_tags' a chain of the struct, union,
5044 and enum tags declared among the parms.
5046 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5048 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5049 a mere declaration. A nonempty identifier-list gets an error message
5050 when FUNCDEF_FLAG is zero. */
5053 grokparms (parms_info, funcdef_flag)
5057 tree first_parm = TREE_CHAIN (parms_info);
5059 last_function_parms = TREE_PURPOSE (parms_info);
5060 last_function_parm_tags = TREE_VALUE (parms_info);
5062 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5063 && !in_system_header)
5064 warning ("function declaration isn't a prototype");
5067 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5070 pedwarn ("parameter names (without types) in function declaration");
5072 last_function_parms = first_parm;
5079 /* We no longer test FUNCDEF_FLAG.
5080 If the arg types are incomplete in a declaration,
5081 they must include undefined tags.
5082 These tags can never be defined in the scope of the declaration,
5083 so the types can never be completed,
5084 and no call can be compiled successfully. */
5086 /* In a fcn definition, arg types must be complete. */
5089 for (parm = last_function_parms, typelt = first_parm;
5091 parm = TREE_CHAIN (parm))
5092 /* Skip over any enumeration constants declared here. */
5093 if (TREE_CODE (parm) == PARM_DECL)
5095 /* Barf if the parameter itself has an incomplete type. */
5096 tree type = TREE_VALUE (typelt);
5097 if (type == error_mark_node)
5099 if (!COMPLETE_TYPE_P (type))
5101 if (funcdef_flag && DECL_NAME (parm) != 0)
5102 error ("parameter `%s' has incomplete type",
5103 IDENTIFIER_POINTER (DECL_NAME (parm)));
5105 warning ("parameter has incomplete type");
5108 TREE_VALUE (typelt) = error_mark_node;
5109 TREE_TYPE (parm) = error_mark_node;
5113 /* This has been replaced by parm_tags_warning, which
5114 uses a more accurate criterion for what to warn
5118 /* Now warn if is a pointer to an incomplete type. */
5119 while (TREE_CODE (type) == POINTER_TYPE
5120 || TREE_CODE (type) == REFERENCE_TYPE)
5121 type = TREE_TYPE (type);
5122 type = TYPE_MAIN_VARIANT (type);
5123 if (!COMPLETE_TYPE_P (type))
5125 if (DECL_NAME (parm) != 0)
5126 warning ("parameter `%s' points to incomplete type",
5127 IDENTIFIER_POINTER (DECL_NAME (parm)));
5129 warning ("parameter points to incomplete type");
5133 typelt = TREE_CHAIN (typelt);
5140 /* Return a tree_list node with info on a parameter list just parsed.
5141 The TREE_PURPOSE is a chain of decls of those parms.
5142 The TREE_VALUE is a list of structure, union and enum tags defined.
5143 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5144 This tree_list node is later fed to `grokparms'.
5146 VOID_AT_END nonzero means append `void' to the end of the type-list.
5147 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5150 get_parm_info (void_at_end)
5156 tree tags = gettags ();
5157 tree parms = getdecls ();
5159 tree order = current_binding_level->parm_order;
5161 /* Just `void' (and no ellipsis) is special. There are really no parms.
5162 But if the `void' is qualified (by `const' or `volatile') or has a
5163 storage class specifier (`register'), then the behavior is undefined;
5164 by not counting it as the special case of `void' we will cause an
5165 error later. Typedefs for `void' are OK (see DR#157). */
5166 if (void_at_end && parms != 0
5167 && TREE_CHAIN (parms) == 0
5168 && VOID_TYPE_P (TREE_TYPE (parms))
5169 && ! TREE_THIS_VOLATILE (parms)
5170 && ! TREE_READONLY (parms)
5171 && ! DECL_REGISTER (parms)
5172 && DECL_NAME (parms) == 0)
5175 storedecls (NULL_TREE);
5176 return tree_cons (NULL_TREE, NULL_TREE,
5177 tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5180 /* Extract enumerator values and other non-parms declared with the parms.
5181 Likewise any forward parm decls that didn't have real parm decls. */
5182 for (decl = parms; decl;)
5184 tree next = TREE_CHAIN (decl);
5186 if (TREE_CODE (decl) != PARM_DECL)
5188 TREE_CHAIN (decl) = new_parms;
5191 else if (TREE_ASM_WRITTEN (decl))
5193 error_with_decl (decl,
5194 "parameter `%s' has just a forward declaration");
5195 TREE_CHAIN (decl) = new_parms;
5201 /* Put the parm decls back in the order they were in in the parm list. */
5202 for (t = order; t; t = TREE_CHAIN (t))
5205 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5207 TREE_CHAIN (TREE_VALUE (t)) = 0;
5210 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5213 /* Store the parmlist in the binding level since the old one
5214 is no longer a valid list. (We have changed the chain pointers.) */
5215 storedecls (new_parms);
5217 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5218 /* There may also be declarations for enumerators if an enumeration
5219 type is declared among the parms. Ignore them here. */
5220 if (TREE_CODE (decl) == PARM_DECL)
5222 /* Since there is a prototype,
5223 args are passed in their declared types. */
5224 tree type = TREE_TYPE (decl);
5225 DECL_ARG_TYPE (decl) = type;
5226 if (PROMOTE_PROTOTYPES
5227 && INTEGRAL_TYPE_P (type)
5228 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5229 DECL_ARG_TYPE (decl) = integer_type_node;
5231 types = tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5232 if (VOID_TYPE_P (TREE_VALUE (types)) && ! erred
5233 && DECL_NAME (decl) == 0)
5235 error ("`void' in parameter list must be the entire list");
5241 return tree_cons (new_parms, tags,
5242 nreverse (tree_cons (NULL_TREE, void_type_node, types)));
5244 return tree_cons (new_parms, tags, nreverse (types));
5247 /* At end of parameter list, warn about any struct, union or enum tags
5248 defined within. Do so because these types cannot ever become complete. */
5251 parmlist_tags_warning ()
5256 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5258 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5259 /* An anonymous union parm type is meaningful as a GNU extension.
5260 So don't warn for that. */
5261 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5263 if (TREE_PURPOSE (elt) != 0)
5265 if (code == RECORD_TYPE)
5266 warning ("`struct %s' declared inside parameter list",
5267 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5268 else if (code == UNION_TYPE)
5269 warning ("`union %s' declared inside parameter list",
5270 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5272 warning ("`enum %s' declared inside parameter list",
5273 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5277 /* For translation these need to be separate warnings */
5278 if (code == RECORD_TYPE)
5279 warning ("anonymous struct declared inside parameter list");
5280 else if (code == UNION_TYPE)
5281 warning ("anonymous union declared inside parameter list");
5283 warning ("anonymous enum declared inside parameter list");
5287 warning ("its scope is only this definition or declaration, which is probably not what you want");
5293 /* Get the struct, enum or union (CODE says which) with tag NAME.
5294 Define the tag as a forward-reference if it is not defined. */
5297 xref_tag (code, name)
5298 enum tree_code code;
5301 /* If a cross reference is requested, look up the type
5302 already defined for this tag and return it. */
5304 tree ref = lookup_tag (code, name, current_binding_level, 0);
5305 /* If this is the right type of tag, return what we found.
5306 (This reference will be shadowed by shadow_tag later if appropriate.)
5307 If this is the wrong type of tag, do not return it. If it was the
5308 wrong type in the same binding level, we will have had an error
5309 message already; if in a different binding level and declaring
5310 a name, pending_xref_error will give an error message; but if in a
5311 different binding level and not declaring a name, this tag should
5312 shadow the previous declaration of a different type of tag, and
5313 this would not work properly if we return the reference found.
5314 (For example, with "struct foo" in an outer scope, "union foo;"
5315 must shadow that tag with a new one of union type.) */
5316 if (ref && TREE_CODE (ref) == code)
5319 /* If no such tag is yet defined, create a forward-reference node
5320 and record it as the "definition".
5321 When a real declaration of this type is found,
5322 the forward-reference will be altered into a real type. */
5324 ref = make_node (code);
5325 if (code == ENUMERAL_TYPE)
5327 /* Give the type a default layout like unsigned int
5328 to avoid crashing if it does not get defined. */
5329 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5330 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5331 TYPE_USER_ALIGN (ref) = 0;
5332 TREE_UNSIGNED (ref) = 1;
5333 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5334 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5335 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5338 pushtag (name, ref);
5343 /* Make sure that the tag NAME is defined *in the current binding level*
5344 at least as a forward reference.
5345 CODE says which kind of tag NAME ought to be. */
5348 start_struct (code, name)
5349 enum tree_code code;
5352 /* If there is already a tag defined at this binding level
5353 (as a forward reference), just return it. */
5358 ref = lookup_tag (code, name, current_binding_level, 1);
5359 if (ref && TREE_CODE (ref) == code)
5361 C_TYPE_BEING_DEFINED (ref) = 1;
5362 TYPE_PACKED (ref) = flag_pack_struct;
5363 if (TYPE_FIELDS (ref))
5365 if (code == UNION_TYPE)
5366 error ("redefinition of `union %s'",
5367 IDENTIFIER_POINTER (name));
5369 error ("redefinition of `struct %s'",
5370 IDENTIFIER_POINTER (name));
5376 /* Otherwise create a forward-reference just so the tag is in scope. */
5378 ref = make_node (code);
5379 pushtag (name, ref);
5380 C_TYPE_BEING_DEFINED (ref) = 1;
5381 TYPE_PACKED (ref) = flag_pack_struct;
5385 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5386 of a structure component, returning a FIELD_DECL node.
5387 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5389 This is done during the parsing of the struct declaration.
5390 The FIELD_DECL nodes are chained together and the lot of them
5391 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5394 grokfield (filename, line, declarator, declspecs, width)
5395 const char *filename ATTRIBUTE_UNUSED;
5396 int line ATTRIBUTE_UNUSED;
5397 tree declarator, declspecs, width;
5401 if (declarator == NULL_TREE && width == NULL_TREE)
5403 /* This is an unnamed decl. We only support unnamed
5404 structs/unions, so check for other things and refuse them. */
5405 if (TREE_CODE (TREE_VALUE (declspecs)) != RECORD_TYPE
5406 && TREE_CODE (TREE_VALUE (declspecs)) != UNION_TYPE)
5408 error ("unnamed fields of type other than struct or union are not allowed");
5413 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5415 finish_decl (value, NULL_TREE, NULL_TREE);
5416 DECL_INITIAL (value) = width;
5418 maybe_objc_check_decl (value);
5422 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5423 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5424 ATTRIBUTES are attributes to be applied to the structure. */
5427 finish_struct (t, fieldlist, attributes)
5433 int toplevel = global_binding_level == current_binding_level;
5434 int saw_named_field;
5436 /* If this type was previously laid out as a forward reference,
5437 make sure we lay it out again. */
5441 decl_attributes (&t, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5443 /* Nameless union parm types are useful as GCC extension. */
5444 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5445 /* Otherwise, warn about any struct or union def. in parmlist. */
5446 if (in_parm_level_p ())
5449 pedwarn ("%s defined inside parms",
5450 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5452 warning ("%s defined inside parms",
5453 TREE_CODE (t) == UNION_TYPE ? _("union") : _("structure"));
5458 for (x = fieldlist; x; x = TREE_CHAIN (x))
5459 if (DECL_NAME (x) != 0)
5463 pedwarn ("%s has no %s",
5464 TREE_CODE (t) == UNION_TYPE ? _("union") : _("struct"),
5465 fieldlist ? _("named members") : _("members"));
5468 /* Install struct as DECL_CONTEXT of each field decl.
5469 Also process specified field sizes,m which is found in the DECL_INITIAL.
5470 Store 0 there, except for ": 0" fields (so we can find them
5471 and delete them, below). */
5473 saw_named_field = 0;
5474 for (x = fieldlist; x; x = TREE_CHAIN (x))
5476 DECL_CONTEXT (x) = t;
5477 DECL_PACKED (x) |= TYPE_PACKED (t);
5479 /* If any field is const, the structure type is pseudo-const. */
5480 if (TREE_READONLY (x))
5481 C_TYPE_FIELDS_READONLY (t) = 1;
5484 /* A field that is pseudo-const makes the structure likewise. */
5485 tree t1 = TREE_TYPE (x);
5486 while (TREE_CODE (t1) == ARRAY_TYPE)
5487 t1 = TREE_TYPE (t1);
5488 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5489 && C_TYPE_FIELDS_READONLY (t1))
5490 C_TYPE_FIELDS_READONLY (t) = 1;
5493 /* Any field that is volatile means variables of this type must be
5494 treated in some ways as volatile. */
5495 if (TREE_THIS_VOLATILE (x))
5496 C_TYPE_FIELDS_VOLATILE (t) = 1;
5498 /* Any field of nominal variable size implies structure is too. */
5499 if (C_DECL_VARIABLE_SIZE (x))
5500 C_TYPE_VARIABLE_SIZE (t) = 1;
5502 /* Detect invalid nested redefinition. */
5503 if (TREE_TYPE (x) == t)
5504 error ("nested redefinition of `%s'",
5505 IDENTIFIER_POINTER (TYPE_NAME (t)));
5507 /* Detect invalid bit-field size. */
5508 if (DECL_INITIAL (x))
5509 STRIP_NOPS (DECL_INITIAL (x));
5510 if (DECL_INITIAL (x))
5512 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5513 constant_expression_warning (DECL_INITIAL (x));
5517 "bit-field `%s' width not an integer constant");
5518 DECL_INITIAL (x) = NULL;
5522 /* Detect invalid bit-field type. */
5523 if (DECL_INITIAL (x)
5524 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5525 && TREE_CODE (TREE_TYPE (x)) != BOOLEAN_TYPE
5526 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5528 error_with_decl (x, "bit-field `%s' has invalid type");
5529 DECL_INITIAL (x) = NULL;
5532 if (DECL_INITIAL (x) && pedantic
5533 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5534 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5535 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != c_bool_type_node
5536 /* Accept an enum that's equivalent to int or unsigned int. */
5537 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5538 && (TYPE_PRECISION (TREE_TYPE (x))
5539 == TYPE_PRECISION (integer_type_node))))
5540 pedwarn_with_decl (x, "bit-field `%s' type invalid in ISO C");
5542 /* Detect and ignore out of range field width and process valid
5544 if (DECL_INITIAL (x))
5547 = (TYPE_MAIN_VARIANT (TREE_TYPE (x)) == c_bool_type_node
5548 ? CHAR_TYPE_SIZE : TYPE_PRECISION (TREE_TYPE (x)));
5550 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5551 error_with_decl (x, "negative width in bit-field `%s'");
5552 else if (0 < compare_tree_int (DECL_INITIAL (x), max_width))
5553 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5554 else if (integer_zerop (DECL_INITIAL (x)) && DECL_NAME (x) != 0)
5555 error_with_decl (x, "zero width for bit-field `%s'");
5558 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5559 unsigned HOST_WIDE_INT width
5560 = tree_low_cst (DECL_INITIAL (x), 1);
5562 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5563 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5564 TREE_UNSIGNED (TREE_TYPE (x)))
5566 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5567 TREE_UNSIGNED (TREE_TYPE (x))))))
5568 warning_with_decl (x,
5569 "`%s' is narrower than values of its type");
5571 DECL_SIZE (x) = bitsize_int (width);
5572 DECL_BIT_FIELD (x) = 1;
5573 SET_DECL_C_BIT_FIELD (x);
5576 && ! (* targetm.ms_bitfield_layout_p) (t))
5578 /* field size 0 => force desired amount of alignment. */
5579 #ifdef EMPTY_FIELD_BOUNDARY
5580 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5582 #ifdef PCC_BITFIELD_TYPE_MATTERS
5583 if (PCC_BITFIELD_TYPE_MATTERS)
5585 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5586 TYPE_ALIGN (TREE_TYPE (x)));
5587 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5594 else if (TREE_TYPE (x) != error_mark_node)
5596 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5597 : TYPE_ALIGN (TREE_TYPE (x)));
5599 /* Non-bit-fields are aligned for their type, except packed
5600 fields which require only BITS_PER_UNIT alignment. */
5601 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5602 if (! DECL_PACKED (x))
5603 DECL_USER_ALIGN (x) |= TYPE_USER_ALIGN (TREE_TYPE (x));
5606 DECL_INITIAL (x) = 0;
5608 /* Detect flexible array member in an invalid context. */
5609 if (TREE_CODE (TREE_TYPE (x)) == ARRAY_TYPE
5610 && TYPE_SIZE (TREE_TYPE (x)) == NULL_TREE
5611 && TYPE_DOMAIN (TREE_TYPE (x)) != NULL_TREE
5612 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x))) == NULL_TREE)
5614 if (TREE_CODE (t) == UNION_TYPE)
5615 error_with_decl (x, "flexible array member in union");
5616 else if (TREE_CHAIN (x) != NULL_TREE)
5617 error_with_decl (x, "flexible array member not at end of struct");
5618 else if (! saw_named_field)
5619 error_with_decl (x, "flexible array member in otherwise empty struct");
5622 saw_named_field = 1;
5625 /* Delete all duplicate fields from the fieldlist */
5626 for (x = fieldlist; x && TREE_CHAIN (x);)
5627 /* Anonymous fields aren't duplicates. */
5628 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5636 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5642 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5644 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5645 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5651 /* Now we have the nearly final fieldlist. Record it,
5652 then lay out the structure or union (including the fields). */
5654 TYPE_FIELDS (t) = fieldlist;
5658 /* Delete all zero-width bit-fields from the fieldlist */
5660 tree *fieldlistp = &fieldlist;
5662 if (TREE_CODE (*fieldlistp) == FIELD_DECL && DECL_INITIAL (*fieldlistp))
5663 *fieldlistp = TREE_CHAIN (*fieldlistp);
5665 fieldlistp = &TREE_CHAIN (*fieldlistp);
5668 /* Now we have the truly final field list.
5669 Store it in this type and in the variants. */
5671 TYPE_FIELDS (t) = fieldlist;
5673 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5675 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5676 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5677 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5678 TYPE_USER_ALIGN (x) = TYPE_USER_ALIGN (t);
5681 /* If this was supposed to be a transparent union, but we can't
5682 make it one, warn and turn off the flag. */
5683 if (TREE_CODE (t) == UNION_TYPE
5684 && TYPE_TRANSPARENT_UNION (t)
5685 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5687 TYPE_TRANSPARENT_UNION (t) = 0;
5688 warning ("union cannot be made transparent");
5691 /* If this structure or union completes the type of any previous
5692 variable declaration, lay it out and output its rtl. */
5694 if (current_binding_level->n_incomplete != 0)
5697 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5699 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl)) == TYPE_MAIN_VARIANT (t)
5700 && TREE_CODE (decl) != TYPE_DECL)
5702 layout_decl (decl, 0);
5703 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5704 maybe_objc_check_decl (decl);
5705 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5708 if (--current_binding_level->n_incomplete == 0)
5711 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl))
5712 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5714 tree element = TREE_TYPE (decl);
5715 while (TREE_CODE (element) == ARRAY_TYPE)
5716 element = TREE_TYPE (element);
5719 layout_array_type (TREE_TYPE (decl));
5720 if (TREE_CODE (decl) != TYPE_DECL)
5722 layout_decl (decl, 0);
5723 maybe_objc_check_decl (decl);
5724 rest_of_decl_compilation (decl, NULL, toplevel, 0);
5728 if (--current_binding_level->n_incomplete == 0)
5735 /* Finish debugging output for this type. */
5736 rest_of_type_compilation (t, toplevel);
5741 /* Lay out the type T, and its element type, and so on. */
5744 layout_array_type (t)
5747 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5748 layout_array_type (TREE_TYPE (t));
5752 /* Begin compiling the definition of an enumeration type.
5753 NAME is its name (or null if anonymous).
5754 Returns the type object, as yet incomplete.
5755 Also records info about it so that build_enumerator
5756 may be used to declare the individual values as they are read. */
5764 /* If this is the real definition for a previous forward reference,
5765 fill in the contents in the same object that used to be the
5766 forward reference. */
5769 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5771 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5773 enumtype = make_node (ENUMERAL_TYPE);
5774 pushtag (name, enumtype);
5777 C_TYPE_BEING_DEFINED (enumtype) = 1;
5779 if (TYPE_VALUES (enumtype) != 0)
5781 /* This enum is a named one that has been declared already. */
5782 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5784 /* Completely replace its old definition.
5785 The old enumerators remain defined, however. */
5786 TYPE_VALUES (enumtype) = 0;
5789 enum_next_value = integer_zero_node;
5792 if (flag_short_enums)
5793 TYPE_PACKED (enumtype) = 1;
5798 /* After processing and defining all the values of an enumeration type,
5799 install their decls in the enumeration type and finish it off.
5800 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5801 and ATTRIBUTES are the specified attributes.
5802 Returns ENUMTYPE. */
5805 finish_enum (enumtype, values, attributes)
5811 tree minnode = 0, maxnode = 0, enum_value_type;
5812 int precision, unsign;
5813 int toplevel = (global_binding_level == current_binding_level);
5815 if (in_parm_level_p ())
5816 warning ("enum defined inside parms");
5818 decl_attributes (&enumtype, attributes, (int) ATTR_FLAG_TYPE_IN_PLACE);
5820 /* Calculate the maximum value of any enumerator in this type. */
5822 if (values == error_mark_node)
5823 minnode = maxnode = integer_zero_node;
5826 minnode = maxnode = TREE_VALUE (values);
5827 for (pair = TREE_CHAIN (values); pair; pair = TREE_CHAIN (pair))
5829 tree value = TREE_VALUE (pair);
5830 if (tree_int_cst_lt (maxnode, value))
5832 if (tree_int_cst_lt (value, minnode))
5837 /* Construct the final type of this enumeration. It is the same
5838 as one of the integral types - the narrowest one that fits, except
5839 that normally we only go as narrow as int - and signed iff any of
5840 the values are negative. */
5841 unsign = (tree_int_cst_sgn (minnode) >= 0);
5842 precision = MAX (min_precision (minnode, unsign),
5843 min_precision (maxnode, unsign));
5844 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5846 tree narrowest = c_common_type_for_size (precision, unsign);
5849 warning ("enumeration values exceed range of largest integer");
5850 narrowest = long_long_integer_type_node;
5853 precision = TYPE_PRECISION (narrowest);
5856 precision = TYPE_PRECISION (integer_type_node);
5858 if (precision == TYPE_PRECISION (integer_type_node))
5859 enum_value_type = c_common_type_for_size (precision, 0);
5861 enum_value_type = enumtype;
5863 TYPE_MIN_VALUE (enumtype) = minnode;
5864 TYPE_MAX_VALUE (enumtype) = maxnode;
5865 TYPE_PRECISION (enumtype) = precision;
5866 TREE_UNSIGNED (enumtype) = unsign;
5867 TYPE_SIZE (enumtype) = 0;
5868 layout_type (enumtype);
5870 if (values != error_mark_node)
5872 /* Change the type of the enumerators to be the enum type. We
5873 need to do this irrespective of the size of the enum, for
5874 proper type checking. Replace the DECL_INITIALs of the
5875 enumerators, and the value slots of the list, with copies
5876 that have the enum type; they cannot be modified in place
5877 because they may be shared (e.g. integer_zero_node) Finally,
5878 change the purpose slots to point to the names of the decls. */
5879 for (pair = values; pair; pair = TREE_CHAIN (pair))
5881 tree enu = TREE_PURPOSE (pair);
5883 TREE_TYPE (enu) = enumtype;
5884 DECL_SIZE (enu) = TYPE_SIZE (enumtype);
5885 DECL_SIZE_UNIT (enu) = TYPE_SIZE_UNIT (enumtype);
5886 DECL_ALIGN (enu) = TYPE_ALIGN (enumtype);
5887 DECL_USER_ALIGN (enu) = TYPE_USER_ALIGN (enumtype);
5888 DECL_MODE (enu) = TYPE_MODE (enumtype);
5890 /* The ISO C Standard mandates enumerators to have type int,
5891 even though the underlying type of an enum type is
5892 unspecified. Here we convert any enumerators that fit in
5893 an int to type int, to avoid promotions to unsigned types
5894 when comparing integers with enumerators that fit in the
5895 int range. When -pedantic is given, build_enumerator()
5896 would have already taken care of those that don't fit. */
5897 if (int_fits_type_p (DECL_INITIAL (enu), enum_value_type))
5898 DECL_INITIAL (enu) = convert (enum_value_type, DECL_INITIAL (enu));
5900 DECL_INITIAL (enu) = convert (enumtype, DECL_INITIAL (enu));
5902 TREE_PURPOSE (pair) = DECL_NAME (enu);
5903 TREE_VALUE (pair) = DECL_INITIAL (enu);
5906 TYPE_VALUES (enumtype) = values;
5909 /* Fix up all variant types of this enum type. */
5910 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5912 if (tem == enumtype)
5914 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5915 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5916 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5917 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5918 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5919 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5920 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5921 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5922 TYPE_USER_ALIGN (tem) = TYPE_USER_ALIGN (enumtype);
5923 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5926 /* Finish debugging output for this type. */
5927 rest_of_type_compilation (enumtype, toplevel);
5932 /* Build and install a CONST_DECL for one value of the
5933 current enumeration type (one that was begun with start_enum).
5934 Return a tree-list containing the CONST_DECL and its value.
5935 Assignment of sequential values by default is handled here. */
5938 build_enumerator (name, value)
5943 /* Validate and default VALUE. */
5945 /* Remove no-op casts from the value. */
5947 STRIP_TYPE_NOPS (value);
5951 if (TREE_CODE (value) == INTEGER_CST)
5953 value = default_conversion (value);
5954 constant_expression_warning (value);
5958 error ("enumerator value for `%s' not integer constant",
5959 IDENTIFIER_POINTER (name));
5964 /* Default based on previous value. */
5965 /* It should no longer be possible to have NON_LVALUE_EXPR
5969 value = enum_next_value;
5971 error ("overflow in enumeration values");
5974 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5976 pedwarn ("ISO C restricts enumerator values to range of `int'");
5977 value = convert (integer_type_node, value);
5980 /* Set basis for default for next value. */
5981 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5982 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5984 /* Now create a declaration for the enum value name. */
5986 type = TREE_TYPE (value);
5987 type = c_common_type_for_size (MAX (TYPE_PRECISION (type),
5988 TYPE_PRECISION (integer_type_node)),
5989 (TYPE_PRECISION (type)
5990 >= TYPE_PRECISION (integer_type_node)
5991 && TREE_UNSIGNED (type)));
5993 decl = build_decl (CONST_DECL, name, type);
5994 DECL_INITIAL (decl) = convert (type, value);
5997 return tree_cons (decl, value, NULL_TREE);
6001 /* Create the FUNCTION_DECL for a function definition.
6002 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6003 the declaration; they describe the function's name and the type it returns,
6004 but twisted together in a fashion that parallels the syntax of C.
6006 This function creates a binding context for the function body
6007 as well as setting up the FUNCTION_DECL in current_function_decl.
6009 Returns 1 on success. If the DECLARATOR is not suitable for a function
6010 (it defines a datum instead), we return 0, which tells
6011 yyparse to report a parse error. */
6014 start_function (declspecs, declarator, attributes)
6015 tree declarator, declspecs, attributes;
6017 tree decl1, old_decl;
6019 int old_immediate_size_expand = immediate_size_expand;
6021 current_function_returns_value = 0; /* Assume, until we see it does. */
6022 current_function_returns_null = 0;
6023 current_function_returns_abnormally = 0;
6024 warn_about_return_type = 0;
6025 current_extern_inline = 0;
6026 c_function_varargs = 0;
6028 shadowed_labels = 0;
6030 /* Don't expand any sizes in the return type of the function. */
6031 immediate_size_expand = 0;
6033 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6035 /* If the declarator is not suitable for a function definition,
6036 cause a syntax error. */
6039 immediate_size_expand = old_immediate_size_expand;
6043 decl_attributes (&decl1, attributes, 0);
6045 /* If #pragma weak was used, mark the decl weak now. */
6046 if (current_binding_level == global_binding_level)
6047 maybe_apply_pragma_weak (decl1);
6049 if (DECL_DECLARED_INLINE_P (decl1)
6050 && DECL_UNINLINABLE (decl1)
6051 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1)))
6052 warning_with_decl (decl1,
6053 "inline function `%s' given attribute noinline");
6055 announce_function (decl1);
6057 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1))))
6059 error ("return type is an incomplete type");
6060 /* Make it return void instead. */
6062 = build_function_type (void_type_node,
6063 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6066 if (warn_about_return_type)
6067 pedwarn_c99 ("return type defaults to `int'");
6069 /* Save the parm names or decls from this function's declarator
6070 where store_parm_decls will find them. */
6071 current_function_parms = last_function_parms;
6072 current_function_parm_tags = last_function_parm_tags;
6074 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6075 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6076 DECL_INITIAL (decl1) = error_mark_node;
6078 /* If this definition isn't a prototype and we had a prototype declaration
6079 before, copy the arg type info from that prototype.
6080 But not if what we had before was a builtin function. */
6081 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6082 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6083 && !DECL_BUILT_IN (old_decl)
6084 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6085 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6086 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6088 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6089 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6090 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6093 /* If there is no explicit declaration, look for any out-of-scope implicit
6096 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6098 /* Optionally warn of old-fashioned def with no previous prototype. */
6099 if (warn_strict_prototypes
6100 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6102 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6103 || (DECL_BUILT_IN (old_decl)
6104 && ! C_DECL_ANTICIPATED (old_decl)))))
6105 warning ("function declaration isn't a prototype");
6106 /* Optionally warn of any global def with no previous prototype. */
6107 else if (warn_missing_prototypes
6108 && TREE_PUBLIC (decl1)
6110 && (TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0
6111 || (DECL_BUILT_IN (old_decl)
6112 && ! C_DECL_ANTICIPATED (old_decl))))
6113 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6114 warning_with_decl (decl1, "no previous prototype for `%s'");
6115 /* Optionally warn of any def with no previous prototype
6116 if the function has already been used. */
6117 else if (warn_missing_prototypes
6118 && old_decl != 0 && TREE_USED (old_decl)
6119 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6120 warning_with_decl (decl1,
6121 "`%s' was used with no prototype before its definition");
6122 /* Optionally warn of any global def with no previous declaration. */
6123 else if (warn_missing_declarations
6124 && TREE_PUBLIC (decl1)
6126 && ! MAIN_NAME_P (DECL_NAME (decl1)))
6127 warning_with_decl (decl1, "no previous declaration for `%s'");
6128 /* Optionally warn of any def with no previous declaration
6129 if the function has already been used. */
6130 else if (warn_missing_declarations
6131 && old_decl != 0 && TREE_USED (old_decl)
6132 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6133 warning_with_decl (decl1,
6134 "`%s' was used with no declaration before its definition");
6136 /* This is a definition, not a reference.
6137 So normally clear DECL_EXTERNAL.
6138 However, `extern inline' acts like a declaration
6139 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6140 DECL_EXTERNAL (decl1) = current_extern_inline;
6142 /* This function exists in static storage.
6143 (This does not mean `static' in the C sense!) */
6144 TREE_STATIC (decl1) = 1;
6146 /* A nested function is not global. */
6147 if (current_function_decl != 0)
6148 TREE_PUBLIC (decl1) = 0;
6150 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6151 if (warn_main > 0 && MAIN_NAME_P (DECL_NAME (decl1)))
6156 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6157 != integer_type_node)
6158 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6160 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6161 args = TREE_CHAIN (args))
6163 tree type = args ? TREE_VALUE (args) : 0;
6165 if (type == void_type_node)
6172 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6173 pedwarn_with_decl (decl1,
6174 "first argument of `%s' should be `int'");
6178 if (TREE_CODE (type) != POINTER_TYPE
6179 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6180 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6182 pedwarn_with_decl (decl1,
6183 "second argument of `%s' should be `char **'");
6187 if (TREE_CODE (type) != POINTER_TYPE
6188 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6189 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6191 pedwarn_with_decl (decl1,
6192 "third argument of `%s' should probably be `char **'");
6197 /* It is intentional that this message does not mention the third
6198 argument because it's only mentioned in an appendix of the
6200 if (argct > 0 && (argct < 2 || argct > 3))
6201 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6203 if (! TREE_PUBLIC (decl1))
6204 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6207 /* Record the decl so that the function name is defined.
6208 If we already have a decl for this name, and it is a FUNCTION_DECL,
6209 use the old decl. */
6211 current_function_decl = pushdecl (decl1);
6214 declare_parm_level (1);
6215 current_binding_level->subblocks_tag_transparent = 1;
6217 make_decl_rtl (current_function_decl, NULL);
6219 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6220 /* Promote the value to int before returning it. */
6221 if (c_promoting_integer_type_p (restype))
6223 /* It retains unsignedness if not really getting wider. */
6224 if (TREE_UNSIGNED (restype)
6225 && (TYPE_PRECISION (restype)
6226 == TYPE_PRECISION (integer_type_node)))
6227 restype = unsigned_type_node;
6229 restype = integer_type_node;
6231 DECL_RESULT (current_function_decl)
6232 = build_decl (RESULT_DECL, NULL_TREE, restype);
6234 /* If this fcn was already referenced via a block-scope `extern' decl
6235 (or an implicit decl), propagate certain information about the usage. */
6236 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6237 TREE_ADDRESSABLE (current_function_decl) = 1;
6239 immediate_size_expand = old_immediate_size_expand;
6241 start_fname_decls ();
6246 /* Record that this function is going to be a varargs function.
6247 This is called before store_parm_decls, which is too early
6248 to call mark_varargs directly. */
6253 c_function_varargs = 1;
6256 /* Store the parameter declarations into the current function declaration.
6257 This is called after parsing the parameter declarations, before
6258 digesting the body of the function.
6260 For an old-style definition, modify the function's type
6261 to specify at least the number of arguments. */
6266 tree fndecl = current_function_decl;
6269 /* This is either a chain of PARM_DECLs (if a prototype was used)
6270 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6271 tree specparms = current_function_parms;
6273 /* This is a list of types declared among parms in a prototype. */
6274 tree parmtags = current_function_parm_tags;
6276 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6277 tree parmdecls = getdecls ();
6279 /* This is a chain of any other decls that came in among the parm
6280 declarations. If a parm is declared with enum {foo, bar} x;
6281 then CONST_DECLs for foo and bar are put here. */
6284 /* The function containing FNDECL, if any. */
6285 tree context = decl_function_context (fndecl);
6287 /* Nonzero if this definition is written with a prototype. */
6290 int saved_warn_shadow = warn_shadow;
6292 /* Don't re-emit shadow warnings. */
6295 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6297 /* This case is when the function was defined with an ANSI prototype.
6298 The parms already have decls, so we need not do anything here
6299 except record them as in effect
6300 and complain if any redundant old-style parm decls were written. */
6311 error_with_decl (fndecl,
6312 "parm types given both in parmlist and separately");
6313 /* Get rid of the erroneous decls; don't keep them on
6314 the list of parms, since they might not be PARM_DECLs. */
6315 for (decl = current_binding_level->names;
6316 decl; decl = TREE_CHAIN (decl))
6317 if (DECL_NAME (decl))
6318 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6319 for (link = current_binding_level->shadowed;
6320 link; link = TREE_CHAIN (link))
6321 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6322 current_binding_level->names = 0;
6323 current_binding_level->shadowed = 0;
6326 specparms = nreverse (specparms);
6327 for (parm = specparms; parm; parm = next)
6329 next = TREE_CHAIN (parm);
6330 if (TREE_CODE (parm) == PARM_DECL)
6332 if (DECL_NAME (parm) == 0)
6333 error_with_decl (parm, "parameter name omitted");
6334 else if (TREE_CODE (TREE_TYPE (parm)) != ERROR_MARK
6335 && VOID_TYPE_P (TREE_TYPE (parm)))
6337 error_with_decl (parm, "parameter `%s' declared void");
6338 /* Change the type to error_mark_node so this parameter
6339 will be ignored by assign_parms. */
6340 TREE_TYPE (parm) = error_mark_node;
6346 /* If we find an enum constant or a type tag,
6347 put it aside for the moment. */
6348 TREE_CHAIN (parm) = 0;
6349 others = chainon (others, parm);
6353 /* Get the decls in their original chain order
6354 and record in the function. */
6355 DECL_ARGUMENTS (fndecl) = getdecls ();
6358 /* If this function takes a variable number of arguments,
6359 add a phony parameter to the end of the parm list,
6360 to represent the position of the first unnamed argument. */
6361 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6364 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6365 /* Let's hope the address of the unnamed parm
6366 won't depend on its type. */
6367 TREE_TYPE (dummy) = integer_type_node;
6368 DECL_ARG_TYPE (dummy) = integer_type_node;
6369 DECL_ARGUMENTS (fndecl) = chainon (DECL_ARGUMENTS (fndecl), dummy);
6373 /* Now pushdecl the enum constants. */
6374 for (parm = others; parm; parm = next)
6376 next = TREE_CHAIN (parm);
6377 if (DECL_NAME (parm) == 0)
6379 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6381 else if (TREE_CODE (parm) != PARM_DECL)
6385 storetags (chainon (parmtags, gettags ()));
6389 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6390 each with a parm name as the TREE_VALUE.
6392 PARMDECLS is a chain of declarations for parameters.
6393 Warning! It can also contain CONST_DECLs which are not parameters
6394 but are names of enumerators of any enum types
6395 declared among the parameters.
6397 First match each formal parameter name with its declaration.
6398 Associate decls with the names and store the decls
6399 into the TREE_PURPOSE slots. */
6401 /* We use DECL_WEAK as a flag to show which parameters have been
6402 seen already since it is not used on PARM_DECL or CONST_DECL. */
6403 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6404 DECL_WEAK (parm) = 0;
6406 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6408 tree tail, found = NULL;
6410 if (TREE_VALUE (parm) == 0)
6412 error_with_decl (fndecl,
6413 "parameter name missing from parameter list");
6414 TREE_PURPOSE (parm) = 0;
6418 /* See if any of the parmdecls specifies this parm by name.
6419 Ignore any enumerator decls. */
6420 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6421 if (DECL_NAME (tail) == TREE_VALUE (parm)
6422 && TREE_CODE (tail) == PARM_DECL)
6428 /* If declaration already marked, we have a duplicate name.
6429 Complain, and don't use this decl twice. */
6430 if (found && DECL_WEAK (found))
6432 error_with_decl (found, "multiple parameters named `%s'");
6436 /* If the declaration says "void", complain and ignore it. */
6437 if (found && VOID_TYPE_P (TREE_TYPE (found)))
6439 error_with_decl (found, "parameter `%s' declared void");
6440 TREE_TYPE (found) = integer_type_node;
6441 DECL_ARG_TYPE (found) = integer_type_node;
6442 layout_decl (found, 0);
6445 /* If no declaration found, default to int. */
6448 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6450 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6451 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6452 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6454 pedwarn_with_decl (found, "type of `%s' defaults to `int'");
6455 else if (extra_warnings)
6456 warning_with_decl (found, "type of `%s' defaults to `int'");
6460 TREE_PURPOSE (parm) = found;
6462 /* Mark this decl as "already found". */
6463 DECL_WEAK (found) = 1;
6466 /* Put anything which is on the parmdecls chain and which is
6467 not a PARM_DECL onto the list NONPARMS. (The types of
6468 non-parm things which might appear on the list include
6469 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6470 any actual PARM_DECLs not matched with any names. */
6473 for (parm = parmdecls; parm;)
6475 tree next = TREE_CHAIN (parm);
6476 TREE_CHAIN (parm) = 0;
6478 if (TREE_CODE (parm) != PARM_DECL)
6479 nonparms = chainon (nonparms, parm);
6482 /* Complain about args with incomplete types. */
6483 if (!COMPLETE_TYPE_P (TREE_TYPE (parm)))
6485 error_with_decl (parm, "parameter `%s' has incomplete type");
6486 TREE_TYPE (parm) = error_mark_node;
6489 if (! DECL_WEAK (parm))
6491 error_with_decl (parm,
6492 "declaration for parameter `%s' but no such parameter");
6493 /* Pretend the parameter was not missing.
6494 This gets us to a standard state and minimizes
6495 further error messages. */
6497 = chainon (specparms,
6498 tree_cons (parm, NULL_TREE, NULL_TREE));
6505 /* Chain the declarations together in the order of the list of
6506 names. Store that chain in the function decl, replacing the
6509 DECL_ARGUMENTS (fndecl) = 0;
6512 for (last = 0; parm; parm = TREE_CHAIN (parm))
6513 if (TREE_PURPOSE (parm))
6516 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6518 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6519 last = TREE_PURPOSE (parm);
6520 TREE_CHAIN (last) = 0;
6524 /* If there was a previous prototype,
6525 set the DECL_ARG_TYPE of each argument according to
6526 the type previously specified, and report any mismatches. */
6528 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6531 for (parm = DECL_ARGUMENTS (fndecl),
6532 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6533 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6534 != void_type_node));
6535 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6537 if (parm == 0 || type == 0
6538 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6540 error ("number of arguments doesn't match prototype");
6541 error_with_file_and_line (current_function_prototype_file,
6542 current_function_prototype_line,
6543 "prototype declaration");
6546 /* Type for passing arg must be consistent with that
6547 declared for the arg. ISO C says we take the unqualified
6548 type for parameters declared with qualified type. */
6549 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm)),
6550 TYPE_MAIN_VARIANT (TREE_VALUE (type))))
6552 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6553 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6555 /* Adjust argument to match prototype. E.g. a previous
6556 `int foo(float);' prototype causes
6557 `int foo(x) float x; {...}' to be treated like
6558 `int foo(float x) {...}'. This is particularly
6559 useful for argument types like uid_t. */
6560 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6562 if (PROMOTE_PROTOTYPES
6563 && INTEGRAL_TYPE_P (TREE_TYPE (parm))
6564 && TYPE_PRECISION (TREE_TYPE (parm))
6565 < TYPE_PRECISION (integer_type_node))
6566 DECL_ARG_TYPE (parm) = integer_type_node;
6570 pedwarn ("promoted argument `%s' doesn't match prototype",
6571 IDENTIFIER_POINTER (DECL_NAME (parm)));
6572 warning_with_file_and_line
6573 (current_function_prototype_file,
6574 current_function_prototype_line,
6575 "prototype declaration");
6580 error ("argument `%s' doesn't match prototype",
6581 IDENTIFIER_POINTER (DECL_NAME (parm)));
6582 error_with_file_and_line (current_function_prototype_file,
6583 current_function_prototype_line,
6584 "prototype declaration");
6588 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6591 /* Otherwise, create a prototype that would match. */
6595 tree actual = 0, last = 0, type;
6597 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6599 type = tree_cons (NULL_TREE, DECL_ARG_TYPE (parm), NULL_TREE);
6601 TREE_CHAIN (last) = type;
6606 type = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6608 TREE_CHAIN (last) = type;
6612 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6613 of the type of this function, but we need to avoid having this
6614 affect the types of other similarly-typed functions, so we must
6615 first force the generation of an identical (but separate) type
6616 node for the relevant function type. The new node we create
6617 will be a variant of the main variant of the original function
6620 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6622 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6625 /* Now store the final chain of decls for the arguments
6626 as the decl-chain of the current lexical scope.
6627 Put the enumerators in as well, at the front so that
6628 DECL_ARGUMENTS is not modified. */
6630 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6633 /* Make sure the binding level for the top of the function body
6634 gets a BLOCK if there are any in the function.
6635 Otherwise, the dbx output is wrong. */
6637 keep_next_if_subblocks = 1;
6639 /* ??? This might be an improvement,
6640 but needs to be thought about some more. */
6642 keep_next_level_flag = 1;
6645 /* Write a record describing this function definition to the prototypes
6646 file (if requested). */
6648 gen_aux_info_record (fndecl, 1, 0, prototype);
6650 /* Initialize the RTL code for the function. */
6651 init_function_start (fndecl, input_filename, lineno);
6653 /* Begin the statement tree for this function. */
6654 begin_stmt_tree (&DECL_SAVED_TREE (current_function_decl));
6656 /* If this is a nested function, save away the sizes of any
6657 variable-size types so that we can expand them when generating
6663 DECL_LANG_SPECIFIC (fndecl)->pending_sizes
6664 = nreverse (get_pending_sizes ());
6665 for (t = DECL_LANG_SPECIFIC (fndecl)->pending_sizes;
6668 SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = context;
6671 /* This function is being processed in whole-function mode. */
6672 cfun->x_whole_function_mode_p = 1;
6674 /* Even though we're inside a function body, we still don't want to
6675 call expand_expr to calculate the size of a variable-sized array.
6676 We haven't necessarily assigned RTL to all variables yet, so it's
6677 not safe to try to expand expressions involving them. */
6678 immediate_size_expand = 0;
6679 cfun->x_dont_save_pending_sizes_p = 1;
6681 warn_shadow = saved_warn_shadow;
6684 /* Finish up a function declaration and compile that function
6685 all the way to assembler language output. The free the storage
6686 for the function definition.
6688 This is called after parsing the body of the function definition.
6690 NESTED is nonzero if the function being finished is nested in another.
6691 CAN_DEFER_P is nonzero if the function may be deferred. */
6694 finish_function (nested, can_defer_p)
6698 tree fndecl = current_function_decl;
6701 /* This caused &foo to be of type ptr-to-const-function which then
6702 got a warning when stored in a ptr-to-function variable. */
6703 TREE_READONLY (fndecl) = 1;
6707 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6709 /* Must mark the RESULT_DECL as being in this function. */
6711 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6713 if (MAIN_NAME_P (DECL_NAME (fndecl)) && flag_hosted)
6715 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6716 != integer_type_node)
6718 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6719 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6721 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6725 #ifdef DEFAULT_MAIN_RETURN
6726 /* Make it so that `main' always returns success by default. */
6727 DEFAULT_MAIN_RETURN;
6730 c_expand_return (integer_zero_node);
6735 finish_fname_decls ();
6737 /* Tie off the statement tree for this function. */
6738 finish_stmt_tree (&DECL_SAVED_TREE (fndecl));
6740 /* Complain if there's just no return statement. */
6741 if (warn_return_type
6742 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl))) != VOID_TYPE
6743 && !current_function_returns_value && !current_function_returns_null
6744 /* Don't complain if we abort. */
6745 && !current_function_returns_abnormally
6746 /* Don't warn for main(). */
6747 && !MAIN_NAME_P (DECL_NAME (fndecl))
6748 /* Or if they didn't actually specify a return type. */
6749 && !C_FUNCTION_IMPLICIT_INT (fndecl)
6750 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6751 inline function, as we might never be compiled separately. */
6752 && DECL_INLINE (fndecl))
6753 warning ("no return statement in function returning non-void");
6755 /* Clear out memory we no longer need. */
6756 free_after_parsing (cfun);
6757 /* Since we never call rest_of_compilation, we never clear
6758 CFUN. Do so explicitly. */
6759 free_after_compilation (cfun);
6764 /* Generate RTL for the body of this function. */
6765 c_expand_body (fndecl, nested, can_defer_p);
6767 /* Let the error reporting routines know that we're outside a
6768 function. For a nested function, this value is used in
6769 c_pop_function_context and then reset via pop_function_context. */
6770 current_function_decl = NULL;
6774 /* Generate the RTL for a deferred function FNDECL. */
6777 c_expand_deferred_function (fndecl)
6780 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6781 function was deferred, e.g. in duplicate_decls. */
6782 if (DECL_INLINE (fndecl) && DECL_RESULT (fndecl))
6784 c_expand_body (fndecl, 0, 0);
6785 current_function_decl = NULL;
6789 /* Generate the RTL for the body of FNDECL. If NESTED_P is non-zero,
6790 then we are already in the process of generating RTL for another
6791 function. If can_defer_p is zero, we won't attempt to defer the
6792 generation of RTL. */
6795 c_expand_body (fndecl, nested_p, can_defer_p)
6797 int nested_p, can_defer_p;
6799 int uninlinable = 1;
6801 /* There's no reason to do any of the work here if we're only doing
6802 semantic analysis; this code just generates RTL. */
6803 if (flag_syntax_only)
6806 if (flag_inline_trees)
6808 /* First, cache whether the current function is inlinable. Some
6809 predicates depend on cfun and current_function_decl to
6810 function completely. */
6811 timevar_push (TV_INTEGRATION);
6812 uninlinable = ! tree_inlinable_function_p (fndecl);
6814 if (! uninlinable && can_defer_p
6815 /* Save function tree for inlining. Should return 0 if the
6816 language does not support function deferring or the
6817 function could not be deferred. */
6818 && defer_fn (fndecl))
6820 /* Let the back-end know that this function exists. */
6821 (*debug_hooks->deferred_inline_function) (fndecl);
6822 timevar_pop (TV_INTEGRATION);
6826 /* Then, inline any functions called in it. */
6827 optimize_inline_calls (fndecl);
6828 timevar_pop (TV_INTEGRATION);
6831 timevar_push (TV_EXPAND);
6835 /* Make sure that we will evaluate variable-sized types involved
6836 in our function's type. */
6837 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl)->pending_sizes);
6838 /* Squirrel away our current state. */
6839 push_function_context ();
6842 /* Initialize the RTL code for the function. */
6843 current_function_decl = fndecl;
6844 input_filename = DECL_SOURCE_FILE (fndecl);
6845 init_function_start (fndecl, input_filename, DECL_SOURCE_LINE (fndecl));
6847 /* This function is being processed in whole-function mode. */
6848 cfun->x_whole_function_mode_p = 1;
6850 /* Even though we're inside a function body, we still don't want to
6851 call expand_expr to calculate the size of a variable-sized array.
6852 We haven't necessarily assigned RTL to all variables yet, so it's
6853 not safe to try to expand expressions involving them. */
6854 immediate_size_expand = 0;
6855 cfun->x_dont_save_pending_sizes_p = 1;
6857 /* If this is a varargs function, inform function.c. */
6858 if (c_function_varargs)
6861 /* Set up parameters and prepare for return, for the function. */
6862 expand_function_start (fndecl, 0);
6864 /* If this function is `main', emit a call to `__main'
6865 to run global initializers, etc. */
6866 if (DECL_NAME (fndecl)
6867 && MAIN_NAME_P (DECL_NAME (fndecl))
6868 && DECL_CONTEXT (fndecl) == NULL_TREE)
6869 expand_main_function ();
6871 /* Generate the RTL for this function. */
6872 expand_stmt (DECL_SAVED_TREE (fndecl));
6875 /* Allow the body of the function to be garbage collected. */
6876 DECL_SAVED_TREE (fndecl) = NULL_TREE;
6879 /* We hard-wired immediate_size_expand to zero above.
6880 expand_function_end will decrement this variable. So, we set the
6881 variable to one here, so that after the decrement it will remain
6883 immediate_size_expand = 1;
6885 /* Allow language dialects to perform special processing. */
6886 if (lang_expand_function_end)
6887 (*lang_expand_function_end) ();
6889 /* Generate rtl for function exit. */
6890 expand_function_end (input_filename, lineno, 0);
6892 /* If this is a nested function, protect the local variables in the stack
6893 above us from being collected while we're compiling this function. */
6895 ggc_push_context ();
6897 /* Run the optimizers and output the assembler code for this function. */
6898 rest_of_compilation (fndecl);
6900 /* Undo the GC context switch. */
6904 /* With just -W, complain only if function returns both with
6905 and without a value. */
6907 && current_function_returns_value
6908 && current_function_returns_null)
6909 warning ("this function may return with or without a value");
6911 /* If requested, warn about function definitions where the function will
6912 return a value (usually of some struct or union type) which itself will
6913 take up a lot of stack space. */
6915 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6917 tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6919 if (ret_type && TYPE_SIZE_UNIT (ret_type)
6920 && TREE_CODE (TYPE_SIZE_UNIT (ret_type)) == INTEGER_CST
6921 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type),
6924 unsigned int size_as_int
6925 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type));
6927 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type), size_as_int) == 0)
6928 warning_with_decl (fndecl,
6929 "size of return value of `%s' is %u bytes",
6932 warning_with_decl (fndecl,
6933 "size of return value of `%s' is larger than %d bytes",
6938 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested_p
6939 && ! flag_inline_trees)
6941 /* Stop pointing to the local nodes about to be freed.
6942 But DECL_INITIAL must remain nonzero so we know this
6943 was an actual function definition.
6944 For a nested function, this is done in c_pop_function_context.
6945 If rest_of_compilation set this to 0, leave it 0. */
6946 if (DECL_INITIAL (fndecl) != 0)
6947 DECL_INITIAL (fndecl) = error_mark_node;
6949 DECL_ARGUMENTS (fndecl) = 0;
6952 if (DECL_STATIC_CONSTRUCTOR (fndecl))
6954 if (targetm.have_ctors_dtors)
6955 (* targetm.asm_out.constructor) (XEXP (DECL_RTL (fndecl), 0),
6956 DEFAULT_INIT_PRIORITY);
6958 static_ctors = tree_cons (NULL_TREE, fndecl, static_ctors);
6961 if (DECL_STATIC_DESTRUCTOR (fndecl))
6963 if (targetm.have_ctors_dtors)
6964 (* targetm.asm_out.destructor) (XEXP (DECL_RTL (fndecl), 0),
6965 DEFAULT_INIT_PRIORITY);
6967 static_dtors = tree_cons (NULL_TREE, fndecl, static_dtors);
6971 /* Return to the enclosing function. */
6972 pop_function_context ();
6973 timevar_pop (TV_EXPAND);
6976 /* Check the declarations given in a for-loop for satisfying the C99
6979 check_for_loop_decls ()
6985 /* If we get here, declarations have been used in a for loop without
6986 the C99 for loop scope. This doesn't make much sense, so don't
6988 error ("`for' loop initial declaration used outside C99 mode");
6991 /* C99 subclause 6.8.5 paragraph 3:
6993 [#3] The declaration part of a for statement shall only
6994 declare identifiers for objects having storage class auto or
6997 It isn't clear whether, in this sentence, "identifiers" binds to
6998 "shall only declare" or to "objects" - that is, whether all identifiers
6999 declared must be identifiers for objects, or whether the restriction
7000 only applies to those that are. (A question on this in comp.std.c
7001 in November 2000 received no answer.) We implement the strictest
7002 interpretation, to avoid creating an extension which later causes
7005 for (t = gettags (); t; t = TREE_CHAIN (t))
7007 if (TREE_PURPOSE (t) != 0)
7009 enum tree_code code = TREE_CODE (TREE_VALUE (t));
7011 if (code == RECORD_TYPE)
7012 error ("`struct %s' declared in `for' loop initial declaration",
7013 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7014 else if (code == UNION_TYPE)
7015 error ("`union %s' declared in `for' loop initial declaration",
7016 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7018 error ("`enum %s' declared in `for' loop initial declaration",
7019 IDENTIFIER_POINTER (TREE_PURPOSE (t)));
7023 for (t = getdecls (); t; t = TREE_CHAIN (t))
7025 if (TREE_CODE (t) != VAR_DECL && DECL_NAME (t))
7026 error_with_decl (t, "declaration of non-variable `%s' in `for' loop initial declaration");
7027 else if (TREE_STATIC (t))
7028 error_with_decl (t, "declaration of static variable `%s' in `for' loop initial declaration");
7029 else if (DECL_EXTERNAL (t))
7030 error_with_decl (t, "declaration of `extern' variable `%s' in `for' loop initial declaration");
7034 /* Save and restore the variables in this file and elsewhere
7035 that keep track of the progress of compilation of the current function.
7036 Used for nested functions. */
7038 struct c_language_function
7040 struct language_function base;
7042 tree shadowed_labels;
7045 int returns_abnormally;
7046 int warn_about_return_type;
7048 struct binding_level *binding_level;
7051 /* Save and reinitialize the variables
7052 used during compilation of a C function. */
7055 c_push_function_context (f)
7058 struct c_language_function *p;
7059 p = ((struct c_language_function *)
7060 xmalloc (sizeof (struct c_language_function)));
7061 f->language = (struct language_function *) p;
7063 p->base.x_stmt_tree = c_stmt_tree;
7064 p->base.x_scope_stmt_stack = c_scope_stmt_stack;
7065 p->named_labels = named_labels;
7066 p->shadowed_labels = shadowed_labels;
7067 p->returns_value = current_function_returns_value;
7068 p->returns_null = current_function_returns_null;
7069 p->returns_abnormally = current_function_returns_abnormally;
7070 p->warn_about_return_type = warn_about_return_type;
7071 p->extern_inline = current_extern_inline;
7072 p->binding_level = current_binding_level;
7075 /* Restore the variables used during compilation of a C function. */
7078 c_pop_function_context (f)
7081 struct c_language_function *p
7082 = (struct c_language_function *) f->language;
7085 /* Bring back all the labels that were shadowed. */
7086 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7087 if (DECL_NAME (TREE_VALUE (link)) != 0)
7088 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7089 = TREE_VALUE (link);
7091 if (DECL_SAVED_INSNS (current_function_decl) == 0
7092 && DECL_SAVED_TREE (current_function_decl) == NULL_TREE)
7094 /* Stop pointing to the local nodes about to be freed. */
7095 /* But DECL_INITIAL must remain nonzero so we know this
7096 was an actual function definition. */
7097 DECL_INITIAL (current_function_decl) = error_mark_node;
7098 DECL_ARGUMENTS (current_function_decl) = 0;
7101 c_stmt_tree = p->base.x_stmt_tree;
7102 c_scope_stmt_stack = p->base.x_scope_stmt_stack;
7103 named_labels = p->named_labels;
7104 shadowed_labels = p->shadowed_labels;
7105 current_function_returns_value = p->returns_value;
7106 current_function_returns_null = p->returns_null;
7107 current_function_returns_abnormally = p->returns_abnormally;
7108 warn_about_return_type = p->warn_about_return_type;
7109 current_extern_inline = p->extern_inline;
7110 current_binding_level = p->binding_level;
7116 /* Mark the language specific parts of F for GC. */
7119 c_mark_function_context (f)
7122 struct c_language_function *p
7123 = (struct c_language_function *) f->language;
7128 mark_c_language_function (&p->base);
7129 ggc_mark_tree (p->shadowed_labels);
7130 ggc_mark_tree (p->named_labels);
7131 mark_binding_level (&p->binding_level);
7134 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7137 c_dup_lang_specific_decl (decl)
7140 struct lang_decl *ld;
7142 if (!DECL_LANG_SPECIFIC (decl))
7145 ld = (struct lang_decl *) ggc_alloc (sizeof (struct lang_decl));
7146 memcpy ((char *) ld, (char *) DECL_LANG_SPECIFIC (decl),
7147 sizeof (struct lang_decl));
7148 DECL_LANG_SPECIFIC (decl) = ld;
7151 /* Mark the language specific bits in T for GC. */
7157 if (TREE_CODE (t) == IDENTIFIER_NODE)
7159 struct lang_identifier *i = (struct lang_identifier *) t;
7160 ggc_mark_tree (i->global_value);
7161 ggc_mark_tree (i->local_value);
7162 ggc_mark_tree (i->label_value);
7163 ggc_mark_tree (i->implicit_decl);
7164 ggc_mark_tree (i->error_locus);
7165 ggc_mark_tree (i->limbo_value);
7167 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7168 ggc_mark (TYPE_LANG_SPECIFIC (t));
7169 else if (DECL_P (t) && DECL_LANG_SPECIFIC (t))
7171 ggc_mark (DECL_LANG_SPECIFIC (t));
7172 c_mark_lang_decl (&DECL_LANG_SPECIFIC (t)->base);
7173 ggc_mark_tree (DECL_LANG_SPECIFIC (t)->pending_sizes);
7177 /* The functions below are required for functionality of doing
7178 function at once processing in the C front end. Currently these
7179 functions are not called from anywhere in the C front end, but as
7180 these changes continue, that will change. */
7182 /* Returns non-zero if the current statement is a full expression,
7183 i.e. temporaries created during that statement should be destroyed
7184 at the end of the statement. */
7187 stmts_are_full_exprs_p ()
7192 /* Returns the stmt_tree (if any) to which statements are currently
7193 being added. If there is no active statement-tree, NULL is
7197 current_stmt_tree ()
7199 return &c_stmt_tree;
7202 /* Returns the stack of SCOPE_STMTs for the current function. */
7205 current_scope_stmt_stack ()
7207 return &c_scope_stmt_stack;
7210 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7214 anon_aggr_type_p (node)
7215 tree node ATTRIBUTE_UNUSED;
7220 /* Dummy function in place of callback used by C++. */
7223 extract_interface_info ()
7227 /* Return a new COMPOUND_STMT, after adding it to the current
7231 c_begin_compound_stmt ()
7235 /* Create the COMPOUND_STMT. */
7236 stmt = add_stmt (build_stmt (COMPOUND_STMT, NULL_TREE));
7241 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
7245 c_expand_decl_stmt (t)
7248 tree decl = DECL_STMT_DECL (t);
7250 /* Expand nested functions. */
7251 if (TREE_CODE (decl) == FUNCTION_DECL
7252 && DECL_CONTEXT (decl) == current_function_decl
7253 && DECL_SAVED_TREE (decl))
7254 c_expand_body (decl, /*nested_p=*/1, /*can_defer_p=*/0);
7257 /* Return the IDENTIFIER_GLOBAL_VALUE of T, for use in common code, since
7258 the definition of IDENTIFIER_GLOBAL_VALUE is different for C and C++. */
7261 identifier_global_value (t)
7264 return IDENTIFIER_GLOBAL_VALUE (t);
7267 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7268 otherwise the name is found in ridpointers from RID_INDEX. */
7271 record_builtin_type (rid_index, name, type)
7278 id = ridpointers[(int) rid_index];
7280 id = get_identifier (name);
7281 pushdecl (build_decl (TYPE_DECL, id, type));
7284 /* Build the void_list_node (void_type_node having been created). */
7286 build_void_list_node ()
7288 tree t = build_tree_list (NULL_TREE, void_type_node);
7292 /* Return something to represent absolute declarators containing a *.
7293 TARGET is the absolute declarator that the * contains.
7294 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
7295 to apply to the pointer type, represented as identifiers, possible mixed
7298 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
7299 if attributes are present) and whose type is the modifier list. */
7302 make_pointer_declarator (type_quals_attrs, target)
7303 tree type_quals_attrs, target;
7306 tree itarget = target;
7307 split_specs_attrs (type_quals_attrs, &quals, &attrs);
7308 if (attrs != NULL_TREE)
7309 itarget = tree_cons (attrs, target, NULL_TREE);
7310 return build1 (INDIRECT_REF, quals, itarget);