1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
21 /* Process declarations and symbol lookup for C front end.
22 Also constructs types; the standard scalar types at initialization,
23 and structure, union, array and enum types when they are declared. */
25 /* ??? not all decl nodes are given the most useful possible
26 line numbers. For example, the CONST_DECLs for enum values. */
35 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
37 { NORMAL, /* Ordinary declaration */
38 FUNCDEF, /* Function definition */
39 PARM, /* Declaration of parm before function body */
40 FIELD, /* Declaration inside struct or union */
41 BITFIELD, /* Likewise but with specified width */
42 TYPENAME}; /* Typename (inside cast or sizeof) */
44 #ifndef CHAR_TYPE_SIZE
45 #define CHAR_TYPE_SIZE BITS_PER_UNIT
48 #ifndef SHORT_TYPE_SIZE
49 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
53 #define INT_TYPE_SIZE BITS_PER_WORD
56 #ifndef LONG_TYPE_SIZE
57 #define LONG_TYPE_SIZE BITS_PER_WORD
60 #ifndef LONG_LONG_TYPE_SIZE
61 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
64 #ifndef WCHAR_UNSIGNED
65 #define WCHAR_UNSIGNED 0
68 #ifndef FLOAT_TYPE_SIZE
69 #define FLOAT_TYPE_SIZE BITS_PER_WORD
72 #ifndef DOUBLE_TYPE_SIZE
73 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
76 #ifndef LONG_DOUBLE_TYPE_SIZE
77 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
80 /* We let tm.h override the types used here, to handle trivial differences
81 such as the choice of unsigned int or long unsigned int for size_t.
82 When machines start needing nontrivial differences in the size type,
83 it would be best to do something here to figure out automatically
84 from other information what type to use. */
87 #define SIZE_TYPE "long unsigned int"
91 #define PTRDIFF_TYPE "long int"
95 #define WCHAR_TYPE "int"
98 /* a node which has tree code ERROR_MARK, and whose type is itself.
99 All erroneous expressions are replaced with this node. All functions
100 that accept nodes as arguments should avoid generating error messages
101 if this node is one of the arguments, since it is undesirable to get
102 multiple error messages from one error in the input. */
104 tree error_mark_node;
106 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
108 tree short_integer_type_node;
109 tree integer_type_node;
110 tree long_integer_type_node;
111 tree long_long_integer_type_node;
113 tree short_unsigned_type_node;
114 tree unsigned_type_node;
115 tree long_unsigned_type_node;
116 tree long_long_unsigned_type_node;
118 tree ptrdiff_type_node;
120 tree unsigned_char_type_node;
121 tree signed_char_type_node;
123 tree wchar_type_node;
124 tree signed_wchar_type_node;
125 tree unsigned_wchar_type_node;
127 tree float_type_node;
128 tree double_type_node;
129 tree long_double_type_node;
131 tree complex_integer_type_node;
132 tree complex_float_type_node;
133 tree complex_double_type_node;
134 tree complex_long_double_type_node;
136 tree intQI_type_node;
137 tree intHI_type_node;
138 tree intSI_type_node;
139 tree intDI_type_node;
141 tree unsigned_intQI_type_node;
142 tree unsigned_intHI_type_node;
143 tree unsigned_intSI_type_node;
144 tree unsigned_intDI_type_node;
146 /* a VOID_TYPE node. */
150 /* Nodes for types `void *' and `const void *'. */
152 tree ptr_type_node, const_ptr_type_node;
154 /* Nodes for types `char *' and `const char *'. */
156 tree string_type_node, const_string_type_node;
158 /* Type `char[SOMENUMBER]'.
159 Used when an array of char is needed and the size is irrelevant. */
161 tree char_array_type_node;
163 /* Type `int[SOMENUMBER]' or something like it.
164 Used when an array of int needed and the size is irrelevant. */
166 tree int_array_type_node;
168 /* Type `wchar_t[SOMENUMBER]' or something like it.
169 Used when a wide string literal is created. */
171 tree wchar_array_type_node;
173 /* type `int ()' -- used for implicit declaration of functions. */
175 tree default_function_type;
177 /* function types `double (double)' and `double (double, double)', etc. */
179 tree double_ftype_double, double_ftype_double_double;
180 tree int_ftype_int, long_ftype_long;
182 /* Function type `void (void *, void *, int)' and similar ones */
184 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
186 /* Function type `char *(char *, char *)' and similar ones */
187 tree string_ftype_ptr_ptr, int_ftype_string_string;
189 /* Function type `int (const void *, const void *, size_t)' */
190 tree int_ftype_cptr_cptr_sizet;
192 /* Two expressions that are constants with value zero.
193 The first is of type `int', the second of type `void *'. */
195 tree integer_zero_node;
196 tree null_pointer_node;
198 /* A node for the integer constant 1. */
200 tree integer_one_node;
202 /* Nonzero if we have seen an invalid cross reference
203 to a struct, union, or enum, but not yet printed the message. */
205 tree pending_invalid_xref;
206 /* File and line to appear in the eventual error message. */
207 char *pending_invalid_xref_file;
208 int pending_invalid_xref_line;
210 /* While defining an enum type, this is 1 plus the last enumerator
213 static tree enum_next_value;
215 /* Nonzero means that there was overflow computing enum_next_value. */
217 static int enum_overflow;
219 /* Parsing a function declarator leaves a list of parameter names
220 or a chain or parameter decls here. */
222 static tree last_function_parms;
224 /* Parsing a function declarator leaves here a chain of structure
225 and enum types declared in the parmlist. */
227 static tree last_function_parm_tags;
229 /* After parsing the declarator that starts a function definition,
230 `start_function' puts here the list of parameter names or chain of decls.
231 `store_parm_decls' finds it here. */
233 static tree current_function_parms;
235 /* Similar, for last_function_parm_tags. */
236 static tree current_function_parm_tags;
238 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
239 that have names. Here so we can clear out their names' definitions
240 at the end of the function. */
242 static tree named_labels;
244 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
246 static tree shadowed_labels;
248 /* Nonzero when store_parm_decls is called indicates a varargs function.
249 Value not meaningful after store_parm_decls. */
251 static int c_function_varargs;
253 /* The FUNCTION_DECL for the function currently being compiled,
254 or 0 if between functions. */
255 tree current_function_decl;
257 /* Set to 0 at beginning of a function definition, set to 1 if
258 a return statement that specifies a return value is seen. */
260 int current_function_returns_value;
262 /* Set to 0 at beginning of a function definition, set to 1 if
263 a return statement with no argument is seen. */
265 int current_function_returns_null;
267 /* Set to nonzero by `grokdeclarator' for a function
268 whose return type is defaulted, if warnings for this are desired. */
270 static int warn_about_return_type;
272 /* Nonzero when starting a function declared `extern inline'. */
274 static int current_extern_inline;
276 /* For each binding contour we allocate a binding_level structure
277 * which records the names defined in that contour.
280 * 1) one for each function definition,
281 * where internal declarations of the parameters appear.
282 * 2) one for each compound statement,
283 * to record its declarations.
285 * The current meaning of a name can be found by searching the levels from
286 * the current one out to the global one.
289 /* Note that the information in the `names' component of the global contour
290 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
294 /* A chain of _DECL nodes for all variables, constants, functions,
295 and typedef types. These are in the reverse of the order supplied.
299 /* A list of structure, union and enum definitions,
300 * for looking up tag names.
301 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
302 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
303 * or ENUMERAL_TYPE node.
307 /* For each level, a list of shadowed outer-level local definitions
308 to be restored when this level is popped.
309 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
310 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
313 /* For each level (except not the global one),
314 a chain of BLOCK nodes for all the levels
315 that were entered and exited one level down. */
318 /* The BLOCK node for this level, if one has been preallocated.
319 If 0, the BLOCK is allocated (if needed) when the level is popped. */
322 /* The binding level which this one is contained in (inherits from). */
323 struct binding_level *level_chain;
325 /* Nonzero for the level that holds the parameters of a function. */
328 /* Nonzero if this level "doesn't exist" for tags. */
329 char tag_transparent;
331 /* Nonzero if sublevels of this level "don't exist" for tags.
332 This is set in the parm level of a function definition
333 while reading the function body, so that the outermost block
334 of the function body will be tag-transparent. */
335 char subblocks_tag_transparent;
337 /* Nonzero means make a BLOCK for this level regardless of all else. */
340 /* Nonzero means make a BLOCK if this level has any subblocks. */
341 char keep_if_subblocks;
343 /* Number of decls in `names' that have incomplete
344 structure or union types. */
347 /* A list of decls giving the (reversed) specified order of parms,
348 not including any forward-decls in the parmlist.
349 This is so we can put the parms in proper order for assign_parms. */
353 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
355 /* The binding level currently in effect. */
357 static struct binding_level *current_binding_level;
359 /* A chain of binding_level structures awaiting reuse. */
361 static struct binding_level *free_binding_level;
363 /* The outermost binding level, for names of file scope.
364 This is created when the compiler is started and exists
365 through the entire run. */
367 static struct binding_level *global_binding_level;
369 /* Binding level structures are initialized by copying this one. */
371 static struct binding_level clear_binding_level
372 = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0};
374 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
376 static int keep_next_level_flag;
378 /* Nonzero means make a BLOCK for the next level pushed
379 if it has subblocks. */
381 static int keep_next_if_subblocks;
383 /* The chain of outer levels of label scopes.
384 This uses the same data structure used for binding levels,
385 but it works differently: each link in the chain records
386 saved values of named_labels and shadowed_labels for
387 a label binding level outside the current one. */
389 static struct binding_level *label_level_chain;
391 /* Forward declarations. */
393 static tree grokparms (), grokdeclarator ();
395 tree builtin_function ();
396 void shadow_tag_warned ();
398 static tree lookup_tag ();
399 static tree lookup_tag_reverse ();
400 static tree lookup_name_current_level ();
401 static char *redeclaration_error_message ();
402 static void layout_array_type ();
404 /* C-specific option variables. */
406 /* Nonzero means allow type mismatches in conditional expressions;
407 just make their values `void'. */
409 int flag_cond_mismatch;
411 /* Nonzero means give `double' the same size as `float'. */
413 int flag_short_double;
415 /* Nonzero means don't recognize the keyword `asm'. */
419 /* Nonzero means don't recognize any builtin functions. */
423 /* Nonzero means don't recognize the non-ANSI builtin functions.
426 int flag_no_nonansi_builtin;
428 /* Nonzero means do some things the same way PCC does. */
430 int flag_traditional;
432 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
434 int flag_signed_bitfields = 1;
435 int explicit_flag_signed_bitfields = 0;
437 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
439 int flag_no_ident = 0;
441 /* Nonzero means warn about implicit declarations. */
445 /* Nonzero means give string constants the type `const char *'
446 to get extra warnings from them. These warnings will be too numerous
447 to be useful, except in thoroughly ANSIfied programs. */
449 int warn_write_strings;
451 /* Nonzero means warn about pointer casts that can drop a type qualifier
452 from the pointer target type. */
456 /* Warn about traditional constructs whose meanings changed in ANSI C. */
458 int warn_traditional;
460 /* Nonzero means warn about sizeof(function) or addition/subtraction
461 of function pointers. */
463 int warn_pointer_arith;
465 /* Nonzero means warn for non-prototype function decls
466 or non-prototyped defs without previous prototype. */
468 int warn_strict_prototypes;
470 /* Nonzero means warn for any global function def
471 without separate previous prototype decl. */
473 int warn_missing_prototypes;
475 /* Nonzero means warn about multiple (redundant) decls for the same single
476 variable or function. */
478 int warn_redundant_decls = 0;
480 /* Nonzero means warn about extern declarations of objects not at
481 file-scope level and about *all* declarations of functions (whether
482 extern or static) not at file-scope level. Note that we exclude
483 implicit function declarations. To get warnings about those, use
486 int warn_nested_externs = 0;
488 /* Warn about *printf or *scanf format/argument anomalies. */
492 /* Warn about a subscript that has type char. */
494 int warn_char_subscripts = 0;
496 /* Warn if a type conversion is done that might have confusing results. */
500 /* Warn if adding () is suggested. */
502 int warn_parentheses;
504 /* Warn if initializer is not completely bracketed. */
506 int warn_missing_braces;
508 /* Nonzero means `$' can be in an identifier.
509 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
511 #ifndef DOLLARS_IN_IDENTIFIERS
512 #define DOLLARS_IN_IDENTIFIERS 1
514 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
516 /* Decode the string P as a language-specific option for C.
517 Return 1 if it is recognized (and handle it);
518 return 0 if not recognized. */
524 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
526 flag_traditional = 1;
527 flag_writable_strings = 1;
528 #if DOLLARS_IN_IDENTIFIERS > 0
529 dollars_in_ident = 1;
532 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
534 flag_traditional = 0;
535 flag_writable_strings = 0;
536 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
538 else if (!strcmp (p, "-fsigned-char"))
539 flag_signed_char = 1;
540 else if (!strcmp (p, "-funsigned-char"))
541 flag_signed_char = 0;
542 else if (!strcmp (p, "-fno-signed-char"))
543 flag_signed_char = 0;
544 else if (!strcmp (p, "-fno-unsigned-char"))
545 flag_signed_char = 1;
546 else if (!strcmp (p, "-fsigned-bitfields")
547 || !strcmp (p, "-fno-unsigned-bitfields"))
549 flag_signed_bitfields = 1;
550 explicit_flag_signed_bitfields = 1;
552 else if (!strcmp (p, "-funsigned-bitfields")
553 || !strcmp (p, "-fno-signed-bitfields"))
555 flag_signed_bitfields = 0;
556 explicit_flag_signed_bitfields = 1;
558 else if (!strcmp (p, "-fshort-enums"))
559 flag_short_enums = 1;
560 else if (!strcmp (p, "-fno-short-enums"))
561 flag_short_enums = 0;
562 else if (!strcmp (p, "-fcond-mismatch"))
563 flag_cond_mismatch = 1;
564 else if (!strcmp (p, "-fno-cond-mismatch"))
565 flag_cond_mismatch = 0;
566 else if (!strcmp (p, "-fshort-double"))
567 flag_short_double = 1;
568 else if (!strcmp (p, "-fno-short-double"))
569 flag_short_double = 0;
570 else if (!strcmp (p, "-fasm"))
572 else if (!strcmp (p, "-fno-asm"))
574 else if (!strcmp (p, "-fbuiltin"))
576 else if (!strcmp (p, "-fno-builtin"))
578 else if (!strcmp (p, "-fno-ident"))
580 else if (!strcmp (p, "-fident"))
582 else if (!strcmp (p, "-ansi"))
583 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
584 else if (!strcmp (p, "-Wimplicit"))
586 else if (!strcmp (p, "-Wno-implicit"))
588 else if (!strcmp (p, "-Wwrite-strings"))
589 warn_write_strings = 1;
590 else if (!strcmp (p, "-Wno-write-strings"))
591 warn_write_strings = 0;
592 else if (!strcmp (p, "-Wcast-qual"))
594 else if (!strcmp (p, "-Wno-cast-qual"))
596 else if (!strcmp (p, "-Wpointer-arith"))
597 warn_pointer_arith = 1;
598 else if (!strcmp (p, "-Wno-pointer-arith"))
599 warn_pointer_arith = 0;
600 else if (!strcmp (p, "-Wstrict-prototypes"))
601 warn_strict_prototypes = 1;
602 else if (!strcmp (p, "-Wno-strict-prototypes"))
603 warn_strict_prototypes = 0;
604 else if (!strcmp (p, "-Wmissing-prototypes"))
605 warn_missing_prototypes = 1;
606 else if (!strcmp (p, "-Wno-missing-prototypes"))
607 warn_missing_prototypes = 0;
608 else if (!strcmp (p, "-Wredundant-decls"))
609 warn_redundant_decls = 1;
610 else if (!strcmp (p, "-Wno-redundant-decls"))
611 warn_redundant_decls = 0;
612 else if (!strcmp (p, "-Wnested-externs"))
613 warn_nested_externs = 1;
614 else if (!strcmp (p, "-Wno-nested-externs"))
615 warn_nested_externs = 0;
616 else if (!strcmp (p, "-Wtraditional"))
617 warn_traditional = 1;
618 else if (!strcmp (p, "-Wno-traditional"))
619 warn_traditional = 0;
620 else if (!strcmp (p, "-Wformat"))
622 else if (!strcmp (p, "-Wno-format"))
624 else if (!strcmp (p, "-Wchar-subscripts"))
625 warn_char_subscripts = 1;
626 else if (!strcmp (p, "-Wno-char-subscripts"))
627 warn_char_subscripts = 0;
628 else if (!strcmp (p, "-Wconversion"))
630 else if (!strcmp (p, "-Wno-conversion"))
632 else if (!strcmp (p, "-Wparentheses"))
633 warn_parentheses = 1;
634 else if (!strcmp (p, "-Wno-parentheses"))
635 warn_parentheses = 0;
636 else if (!strcmp (p, "-Wreturn-type"))
637 warn_return_type = 1;
638 else if (!strcmp (p, "-Wno-return-type"))
639 warn_return_type = 0;
640 else if (!strcmp (p, "-Wcomment"))
641 ; /* cpp handles this one. */
642 else if (!strcmp (p, "-Wno-comment"))
643 ; /* cpp handles this one. */
644 else if (!strcmp (p, "-Wcomments"))
645 ; /* cpp handles this one. */
646 else if (!strcmp (p, "-Wno-comments"))
647 ; /* cpp handles this one. */
648 else if (!strcmp (p, "-Wtrigraphs"))
649 ; /* cpp handles this one. */
650 else if (!strcmp (p, "-Wno-trigraphs"))
651 ; /* cpp handles this one. */
652 else if (!strcmp (p, "-Wimport"))
653 ; /* cpp handles this one. */
654 else if (!strcmp (p, "-Wno-import"))
655 ; /* cpp handles this one. */
656 else if (!strcmp (p, "-Wmissing-braces"))
657 warn_missing_braces = 1;
658 else if (!strcmp (p, "-Wno-missing-braces"))
659 warn_missing_braces = 0;
660 else if (!strcmp (p, "-Wall"))
663 /* We save the value of warn_uninitialized, since if they put
664 -Wuninitialized on the command line, we need to generate a
665 warning about not using it without also specifying -O. */
666 if (warn_uninitialized != 1)
667 warn_uninitialized = 2;
669 warn_return_type = 1;
673 warn_char_subscripts = 1;
674 warn_parentheses = 1;
675 warn_missing_braces = 1;
683 /* Hooks for print_node. */
696 print_lang_identifier (file, node, indent)
701 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
702 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
703 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
704 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
705 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
706 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
709 /* Create a new `struct binding_level'. */
712 struct binding_level *
713 make_binding_level ()
716 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
719 /* Nonzero if we are currently in the global binding level. */
724 return current_binding_level == global_binding_level;
730 keep_next_level_flag = 1;
733 /* Nonzero if the current level needs to have a BLOCK made. */
738 return ((current_binding_level->keep_if_subblocks
739 && current_binding_level->blocks != 0)
740 || current_binding_level->keep
741 || current_binding_level->names != 0
742 || (current_binding_level->tags != 0
743 && !current_binding_level->tag_transparent));
746 /* Identify this binding level as a level of parameters.
747 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
748 But it turns out there is no way to pass the right value for
749 DEFINITION_FLAG, so we ignore it. */
752 declare_parm_level (definition_flag)
755 current_binding_level->parm_flag = 1;
758 /* Nonzero if currently making parm declarations. */
763 return current_binding_level->parm_flag;
766 /* Enter a new binding level.
767 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
768 not for that of tags. */
771 pushlevel (tag_transparent)
774 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
776 /* If this is the top level of a function,
777 just make sure that NAMED_LABELS is 0. */
779 if (current_binding_level == global_binding_level)
784 /* Reuse or create a struct for this binding level. */
786 if (free_binding_level)
788 newlevel = free_binding_level;
789 free_binding_level = free_binding_level->level_chain;
793 newlevel = make_binding_level ();
796 /* Add this level to the front of the chain (stack) of levels that
799 *newlevel = clear_binding_level;
800 newlevel->tag_transparent
802 || (current_binding_level
803 ? current_binding_level->subblocks_tag_transparent
805 newlevel->level_chain = current_binding_level;
806 current_binding_level = newlevel;
807 newlevel->keep = keep_next_level_flag;
808 keep_next_level_flag = 0;
809 newlevel->keep_if_subblocks = keep_next_if_subblocks;
810 keep_next_if_subblocks = 0;
813 /* Exit a binding level.
814 Pop the level off, and restore the state of the identifier-decl mappings
815 that were in effect when this level was entered.
817 If KEEP is nonzero, this level had explicit declarations, so
818 and create a "block" (a BLOCK node) for the level
819 to record its declarations and subblocks for symbol table output.
821 If FUNCTIONBODY is nonzero, this level is the body of a function,
822 so create a block as if KEEP were set and also clear out all
825 If REVERSE is nonzero, reverse the order of decls before putting
826 them into the BLOCK. */
829 poplevel (keep, reverse, functionbody)
835 /* The chain of decls was accumulated in reverse order.
836 Put it into forward order, just for cleanliness. */
838 tree tags = current_binding_level->tags;
839 tree subblocks = current_binding_level->blocks;
842 int block_previously_created;
844 keep |= current_binding_level->keep;
846 /* This warning is turned off because it causes warnings for
847 declarations like `extern struct foo *x'. */
849 /* Warn about incomplete structure types in this level. */
850 for (link = tags; link; link = TREE_CHAIN (link))
851 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
853 tree type = TREE_VALUE (link);
855 switch (TREE_CODE (type))
858 errmsg = "`struct %s' incomplete in scope ending here";
861 errmsg = "`union %s' incomplete in scope ending here";
864 errmsg = "`enum %s' incomplete in scope ending here";
867 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
868 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
870 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
871 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
875 /* Get the decls in the order they were written.
876 Usually current_binding_level->names is in reverse order.
877 But parameter decls were previously put in forward order. */
880 current_binding_level->names
881 = decls = nreverse (current_binding_level->names);
883 decls = current_binding_level->names;
885 /* Output any nested inline functions within this block
886 if they weren't already output. */
888 for (decl = decls; decl; decl = TREE_CHAIN (decl))
889 if (TREE_CODE (decl) == FUNCTION_DECL
890 && ! TREE_ASM_WRITTEN (decl)
891 && DECL_INITIAL (decl) != 0
892 && TREE_ADDRESSABLE (decl))
894 /* If this decl was copied from a file-scope decl
895 on account of a block-scope extern decl,
896 propagate TREE_ADDRESSABLE to the file-scope decl. */
897 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
898 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
900 output_inline_function (decl);
903 /* If there were any declarations or structure tags in that level,
904 or if this level is a function body,
905 create a BLOCK to record them for the life of this function. */
908 block_previously_created = (current_binding_level->this_block != 0);
909 if (block_previously_created)
910 block = current_binding_level->this_block;
911 else if (keep || functionbody
912 || (current_binding_level->keep_if_subblocks && subblocks != 0))
913 block = make_node (BLOCK);
916 BLOCK_VARS (block) = decls;
917 BLOCK_TYPE_TAGS (block) = tags;
918 BLOCK_SUBBLOCKS (block) = subblocks;
919 remember_end_note (block);
922 /* In each subblock, record that this is its superior. */
924 for (link = subblocks; link; link = TREE_CHAIN (link))
925 BLOCK_SUPERCONTEXT (link) = block;
927 /* Clear out the meanings of the local variables of this level. */
929 for (link = decls; link; link = TREE_CHAIN (link))
931 if (DECL_NAME (link) != 0)
933 /* If the ident. was used or addressed via a local extern decl,
934 don't forget that fact. */
935 if (DECL_EXTERNAL (link))
937 if (TREE_USED (link))
938 TREE_USED (DECL_NAME (link)) = 1;
939 if (TREE_ADDRESSABLE (link))
940 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
942 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
946 /* Restore all name-meanings of the outer levels
947 that were shadowed by this level. */
949 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
950 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
952 /* If the level being exited is the top level of a function,
953 check over all the labels, and clear out the current
954 (function local) meanings of their names. */
958 /* If this is the top level block of a function,
959 the vars are the function's parameters.
960 Don't leave them in the BLOCK because they are
961 found in the FUNCTION_DECL instead. */
963 BLOCK_VARS (block) = 0;
965 /* Clear out the definitions of all label names,
966 since their scopes end here,
967 and add them to BLOCK_VARS. */
969 for (link = named_labels; link; link = TREE_CHAIN (link))
971 register tree label = TREE_VALUE (link);
973 if (DECL_INITIAL (label) == 0)
975 error_with_decl (label, "label `%s' used but not defined");
976 /* Avoid crashing later. */
977 define_label (input_filename, lineno,
980 else if (warn_unused && !TREE_USED (label))
981 warning_with_decl (label, "label `%s' defined but not used");
982 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
984 /* Put the labels into the "variables" of the
985 top-level block, so debugger can see them. */
986 TREE_CHAIN (label) = BLOCK_VARS (block);
987 BLOCK_VARS (block) = label;
991 /* Pop the current level, and free the structure for reuse. */
994 register struct binding_level *level = current_binding_level;
995 current_binding_level = current_binding_level->level_chain;
997 level->level_chain = free_binding_level;
998 free_binding_level = level;
1001 /* Dispose of the block that we just made inside some higher level. */
1003 DECL_INITIAL (current_function_decl) = block;
1006 if (!block_previously_created)
1007 current_binding_level->blocks
1008 = chainon (current_binding_level->blocks, block);
1010 /* If we did not make a block for the level just exited,
1011 any blocks made for inner levels
1012 (since they cannot be recorded as subblocks in that level)
1013 must be carried forward so they will later become subblocks
1014 of something else. */
1016 current_binding_level->blocks
1017 = chainon (current_binding_level->blocks, subblocks);
1019 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1020 binding contour so that they point to the appropriate construct, i.e.
1021 either to the current FUNCTION_DECL node, or else to the BLOCK node
1022 we just constructed.
1024 Note that for tagged types whose scope is just the formal parameter
1025 list for some function type specification, we can't properly set
1026 their TYPE_CONTEXTs here, because we don't have a pointer to the
1027 appropriate FUNCTION_TYPE node readily available to us. For those
1028 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1029 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1030 node which will represent the "scope" for these "parameter list local"
1035 for (link = tags; link; link = TREE_CHAIN (link))
1036 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1038 for (link = tags; link; link = TREE_CHAIN (link))
1039 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1042 TREE_USED (block) = 1;
1046 /* Delete the node BLOCK from the current binding level.
1047 This is used for the block inside a stmt expr ({...})
1048 so that the block can be reinserted where appropriate. */
1051 delete_block (block)
1055 if (current_binding_level->blocks == block)
1056 current_binding_level->blocks = TREE_CHAIN (block);
1057 for (t = current_binding_level->blocks; t;)
1059 if (TREE_CHAIN (t) == block)
1060 TREE_CHAIN (t) = TREE_CHAIN (block);
1064 TREE_CHAIN (block) = NULL;
1065 /* Clear TREE_USED which is always set by poplevel.
1066 The flag is set again if insert_block is called. */
1067 TREE_USED (block) = 0;
1070 /* Insert BLOCK at the end of the list of subblocks of the
1071 current binding level. This is used when a BIND_EXPR is expanded,
1072 to handle the BLOCK node inside teh BIND_EXPR. */
1075 insert_block (block)
1078 TREE_USED (block) = 1;
1079 current_binding_level->blocks
1080 = chainon (current_binding_level->blocks, block);
1083 /* Set the BLOCK node for the innermost scope
1084 (the one we are currently in). */
1088 register tree block;
1090 current_binding_level->this_block = block;
1096 register struct binding_level *newlevel;
1098 /* Reuse or create a struct for this binding level. */
1100 if (free_binding_level)
1102 newlevel = free_binding_level;
1103 free_binding_level = free_binding_level->level_chain;
1107 newlevel = make_binding_level ();
1110 /* Add this level to the front of the chain (stack) of label levels. */
1112 newlevel->level_chain = label_level_chain;
1113 label_level_chain = newlevel;
1115 newlevel->names = named_labels;
1116 newlevel->shadowed = shadowed_labels;
1118 shadowed_labels = 0;
1124 register struct binding_level *level = label_level_chain;
1127 /* Clear out the definitions of the declared labels in this level.
1128 Leave in the list any ordinary, non-declared labels. */
1129 for (link = named_labels, prev = 0; link;)
1131 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1133 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1135 error_with_decl ("label `%s' used but not defined",
1137 /* Avoid crashing later. */
1138 define_label (input_filename, lineno,
1139 DECL_NAME (TREE_VALUE (link)));
1141 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1142 warning_with_decl (TREE_VALUE (link),
1143 "label `%s' defined but not used");
1144 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1146 /* Delete this element from the list. */
1147 link = TREE_CHAIN (link);
1149 TREE_CHAIN (prev) = link;
1151 named_labels = link;
1156 link = TREE_CHAIN (link);
1160 /* Bring back all the labels that were shadowed. */
1161 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1162 if (DECL_NAME (TREE_VALUE (link)) != 0)
1163 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1164 = TREE_VALUE (link);
1166 named_labels = chainon (named_labels, level->names);
1167 shadowed_labels = level->shadowed;
1169 /* Pop the current level, and free the structure for reuse. */
1170 label_level_chain = label_level_chain->level_chain;
1171 level->level_chain = free_binding_level;
1172 free_binding_level = level;
1175 /* Push a definition or a declaration of struct, union or enum tag "name".
1176 "type" should be the type node.
1177 We assume that the tag "name" is not already defined.
1179 Note that the definition may really be just a forward reference.
1180 In that case, the TYPE_SIZE will be zero. */
1183 pushtag (name, type)
1186 register struct binding_level *b;
1188 /* Find the proper binding level for this type tag. */
1190 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1195 /* Record the identifier as the type's name if it has none. */
1197 if (TYPE_NAME (type) == 0)
1198 TYPE_NAME (type) = name;
1201 if (b == global_binding_level)
1202 b->tags = perm_tree_cons (name, type, b->tags);
1204 b->tags = saveable_tree_cons (name, type, b->tags);
1206 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1207 tagged type we just added to the current binding level. This fake
1208 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1209 to output a representation of a tagged type, and it also gives
1210 us a convenient place to record the "scope start" address for the
1213 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1216 /* Handle when a new declaration NEWDECL
1217 has the same name as an old one OLDDECL
1218 in the same binding contour.
1219 Prints an error message if appropriate.
1221 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1222 Otherwise, return 0. */
1225 duplicate_decls (newdecl, olddecl)
1226 register tree newdecl, olddecl;
1228 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1229 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1230 && DECL_INITIAL (newdecl) != 0);
1231 tree oldtype = TREE_TYPE (olddecl);
1232 tree newtype = TREE_TYPE (newdecl);
1234 if (TREE_CODE (newtype) == ERROR_MARK
1235 || TREE_CODE (oldtype) == ERROR_MARK)
1238 /* New decl is completely inconsistent with the old one =>
1239 tell caller to replace the old one.
1240 This is always an error except in the case of shadowing a builtin. */
1241 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1243 if (TREE_CODE (olddecl) == FUNCTION_DECL
1244 && DECL_BUILT_IN (olddecl))
1246 /* If you declare a built-in function name as static, the
1247 built-in definition is overridden,
1248 but optionally warn this was a bad choice of name. */
1249 if (!TREE_PUBLIC (newdecl))
1252 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1254 /* Likewise, if the built-in is not ansi, then programs can
1255 override it even globally without an error. */
1256 else if (DECL_BUILT_IN_NONANSI (olddecl))
1257 warning_with_decl (newdecl,
1258 "built-in function `%s' declared as non-function");
1260 error_with_decl (newdecl,
1261 "built-in function `%s' declared as non-function");
1263 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1264 && DECL_BUILT_IN_NONANSI (olddecl))
1266 /* If overriding decl is static,
1267 optionally warn this was a bad choice of name. */
1268 if (!TREE_PUBLIC (newdecl))
1271 warning_with_decl (newdecl, "shadowing library function `%s'");
1273 /* Otherwise, always warn. */
1275 warning_with_decl (newdecl,
1276 "library function `%s' declared as non-function");
1280 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1281 error_with_decl (olddecl, "previous declaration of `%s'");
1287 /* For real parm decl following a forward decl,
1288 return 1 so old decl will be reused. */
1289 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1290 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1293 /* The new declaration is the same kind of object as the old one.
1294 The declarations may partially match. Print warnings if they don't
1295 match enough. Ultimately, copy most of the information from the new
1296 decl to the old one, and keep using the old one. */
1298 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1299 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1300 && DECL_INITIAL (olddecl) == 0)
1301 /* If -traditional, avoid error for redeclaring fcn
1302 after implicit decl. */
1304 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1305 && DECL_BUILT_IN (olddecl))
1307 /* A function declaration for a built-in function. */
1308 if (!TREE_PUBLIC (newdecl))
1310 /* If you declare a built-in function name as static, the
1311 built-in definition is overridden,
1312 but optionally warn this was a bad choice of name. */
1314 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1315 /* Discard the old built-in function. */
1318 else if (!types_match)
1320 /* Accept the return type of the new declaration if same modes. */
1321 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1322 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1323 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1325 /* Function types may be shared, so we can't just modify
1326 the return type of olddecl's function type. */
1328 = build_function_type (newreturntype,
1329 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1331 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1333 TREE_TYPE (olddecl) = newtype;
1335 /* Accept harmless mismatch in first argument type also.
1337 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1338 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0
1339 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))) != 0
1340 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))) != 0
1341 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))))
1343 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))))))
1345 /* Function types may be shared, so we can't just modify
1346 the return type of olddecl's function type. */
1348 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl)),
1349 tree_cons (NULL_TREE,
1350 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))),
1351 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl)))));
1353 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1355 TREE_TYPE (olddecl) = newtype;
1360 /* If types don't match for a built-in, throw away the built-in. */
1361 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1365 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1366 && DECL_SOURCE_LINE (olddecl) == 0)
1368 /* A function declaration for a predeclared function
1369 that isn't actually built in. */
1370 if (!TREE_PUBLIC (newdecl))
1372 /* If you declare it as static, the
1373 default definition is overridden. */
1376 else if (!types_match)
1378 /* If the types don't match, preserve volatility indication.
1379 Later on, we will discard everything else about the
1380 default declaration. */
1381 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1384 /* Permit char *foo () to match void *foo (...) if not pedantic,
1385 if one of them came from a system header file. */
1386 else if (!types_match
1387 && TREE_CODE (olddecl) == FUNCTION_DECL
1388 && TREE_CODE (newdecl) == FUNCTION_DECL
1389 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1390 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1391 && (DECL_IN_SYSTEM_HEADER (olddecl)
1392 || DECL_IN_SYSTEM_HEADER (newdecl))
1393 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1394 && TYPE_ARG_TYPES (oldtype) == 0
1395 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1396 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1398 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1399 && TYPE_ARG_TYPES (newtype) == 0
1400 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1401 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1404 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1405 /* Make sure we keep void * as ret type, not char *. */
1406 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1407 TREE_TYPE (newdecl) = newtype = oldtype;
1409 else if (!types_match
1410 /* Permit char *foo (int, ...); followed by char *foo ();
1412 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1414 /* Return types must still match. */
1415 && comptypes (TREE_TYPE (oldtype),
1416 TREE_TYPE (newtype))
1417 && TYPE_ARG_TYPES (newtype) == 0))
1419 error_with_decl (newdecl, "conflicting types for `%s'");
1420 /* Check for function type mismatch
1421 involving an empty arglist vs a nonempty one. */
1422 if (TREE_CODE (olddecl) == FUNCTION_DECL
1423 && comptypes (TREE_TYPE (oldtype),
1424 TREE_TYPE (newtype))
1425 && ((TYPE_ARG_TYPES (oldtype) == 0
1426 && DECL_INITIAL (olddecl) == 0)
1428 (TYPE_ARG_TYPES (newtype) == 0
1429 && DECL_INITIAL (newdecl) == 0)))
1431 /* Classify the problem further. */
1432 register tree t = TYPE_ARG_TYPES (oldtype);
1434 t = TYPE_ARG_TYPES (newtype);
1435 for (; t; t = TREE_CHAIN (t))
1437 register tree type = TREE_VALUE (t);
1439 if (TREE_CHAIN (t) == 0
1440 && TYPE_MAIN_VARIANT (type) != void_type_node)
1442 error ("A parameter list with an ellipsis can't match");
1443 error ("an empty parameter name list declaration.");
1447 if (TYPE_MAIN_VARIANT (type) == float_type_node
1448 || C_PROMOTING_INTEGER_TYPE_P (type))
1450 error ("An argument type that has a default promotion");
1451 error ("can't match an empty parameter name list declaration.");
1456 error_with_decl (olddecl, "previous declaration of `%s'");
1460 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1463 error_with_decl (newdecl, errmsg);
1464 error_with_decl (olddecl,
1465 ((DECL_INITIAL (olddecl)
1466 && current_binding_level == global_binding_level)
1467 ? "`%s' previously defined here"
1468 : "`%s' previously declared here"));
1470 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1471 && DECL_INITIAL (olddecl) != 0
1472 && TYPE_ARG_TYPES (oldtype) == 0
1473 && TYPE_ARG_TYPES (newtype) != 0)
1475 register tree type, parm;
1477 /* Prototype decl follows defn w/o prototype. */
1479 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1480 type = TYPE_ARG_TYPES (newtype),
1482 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1483 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1484 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1486 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1487 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1489 errmsg = "prototype for `%s' follows and number of arguments";
1492 /* Type for passing arg must be consistent
1493 with that declared for the arg. */
1494 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1495 /* If -traditional, allow `unsigned int' instead of `int'
1496 in the prototype. */
1497 && (! (flag_traditional
1498 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1499 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1501 errmsg = "prototype for `%s' follows and argument %d";
1507 error_with_decl (newdecl, errmsg, nargs);
1508 error_with_decl (olddecl,
1509 "doesn't match non-prototype definition here");
1513 warning_with_decl (newdecl, "prototype for `%s' follows");
1514 warning_with_decl (olddecl, "non-prototype definition here");
1517 /* Warn about mismatches in various flags. */
1520 /* Warn if function is now inline
1521 but was previously declared not inline and has been called. */
1522 if (TREE_CODE (olddecl) == FUNCTION_DECL
1523 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1524 && TREE_USED (olddecl))
1525 warning_with_decl (newdecl,
1526 "`%s' declared inline after being called");
1527 if (TREE_CODE (olddecl) == FUNCTION_DECL
1528 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1529 && DECL_INITIAL (olddecl) != 0)
1530 warning_with_decl (newdecl,
1531 "`%s' declared inline after its definition");
1532 /* It is nice to warn when a function is declared
1533 global first and then static. */
1534 if (TREE_CODE (olddecl) == FUNCTION_DECL
1535 && TREE_PUBLIC (olddecl)
1536 && !TREE_PUBLIC (newdecl))
1537 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1539 /* These bits are logically part of the type, for variables.
1540 But not for functions
1541 (where qualifiers are not valid ANSI anyway). */
1542 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1543 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1544 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1545 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1549 /* Optionally warn about more than one declaration for the same name. */
1550 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1551 /* Dont warn about a function declaration
1552 followed by a definition. */
1553 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1554 && DECL_INITIAL (olddecl) == 0))
1556 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1557 warning_with_decl (olddecl, "previous declaration of `%s'");
1560 /* Copy all the DECL_... slots specified in the new decl
1561 except for any that we copy here from the old type.
1563 Past this point, we don't change OLDTYPE and NEWTYPE
1564 even if we change the types of NEWDECL and OLDDECL. */
1568 /* Merge the data types specified in the two decls. */
1569 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1571 = TREE_TYPE (olddecl)
1572 = common_type (newtype, oldtype);
1574 /* Lay the type out, unless already done. */
1575 if (oldtype != TREE_TYPE (newdecl))
1577 if (TREE_TYPE (newdecl) != error_mark_node)
1578 layout_type (TREE_TYPE (newdecl));
1579 if (TREE_CODE (newdecl) != FUNCTION_DECL
1580 && TREE_CODE (newdecl) != TYPE_DECL
1581 && TREE_CODE (newdecl) != CONST_DECL)
1582 layout_decl (newdecl, 0);
1586 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1587 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1588 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1589 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1590 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1593 /* Keep the old rtl since we can safely use it. */
1594 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1596 /* Merge the type qualifiers. */
1597 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1598 && !TREE_THIS_VOLATILE (newdecl))
1599 TREE_THIS_VOLATILE (olddecl) = 0;
1600 if (TREE_READONLY (newdecl))
1601 TREE_READONLY (olddecl) = 1;
1602 if (TREE_THIS_VOLATILE (newdecl))
1604 TREE_THIS_VOLATILE (olddecl) = 1;
1605 if (TREE_CODE (newdecl) == VAR_DECL)
1606 make_var_volatile (newdecl);
1609 /* Keep source location of definition rather than declaration. */
1610 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1612 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1613 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1616 /* Merge the unused-warning information. */
1617 if (DECL_IN_SYSTEM_HEADER (olddecl))
1618 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1619 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1620 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1622 /* Merge the initialization information. */
1623 if (DECL_INITIAL (newdecl) == 0)
1624 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1626 /* If cannot merge, then use the new type and qualifiers,
1627 and don't preserve the old rtl. */
1630 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1631 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1632 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1633 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1636 /* Merge the storage class information. */
1637 /* For functions, static overrides non-static. */
1638 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1640 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1641 /* This is since we don't automatically
1642 copy the attributes of NEWDECL into OLDDECL. */
1643 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1644 /* If this clears `static', clear it in the identifier too. */
1645 if (! TREE_PUBLIC (olddecl))
1646 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1648 if (DECL_EXTERNAL (newdecl))
1650 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1651 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1652 /* An extern decl does not override previous storage class. */
1653 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1657 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1658 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1661 /* If either decl says `inline', this fn is inline,
1662 unless its definition was passed already. */
1663 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1664 DECL_INLINE (olddecl) = 1;
1665 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1667 /* Get rid of any built-in function if new arg types don't match it
1668 or if we have a function definition. */
1669 if (TREE_CODE (newdecl) == FUNCTION_DECL
1670 && DECL_BUILT_IN (olddecl)
1671 && (!types_match || new_is_definition))
1673 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1674 DECL_BUILT_IN (olddecl) = 0;
1677 /* If redeclaring a builtin function, and not a definition,
1679 Also preserve various other info from the definition. */
1680 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1682 if (DECL_BUILT_IN (olddecl))
1684 DECL_BUILT_IN (newdecl) = 1;
1685 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1688 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1690 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1691 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1692 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1693 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1696 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1697 But preserve OLDdECL's DECL_UID. */
1699 register unsigned olddecl_uid = DECL_UID (olddecl);
1701 bcopy ((char *) newdecl + sizeof (struct tree_common),
1702 (char *) olddecl + sizeof (struct tree_common),
1703 sizeof (struct tree_decl) - sizeof (struct tree_common));
1704 DECL_UID (olddecl) = olddecl_uid;
1710 /* Record a decl-node X as belonging to the current lexical scope.
1711 Check for errors (such as an incompatible declaration for the same
1712 name already seen in the same scope).
1714 Returns either X or an old decl for the same name.
1715 If an old decl is returned, it may have been smashed
1716 to agree with what X says. */
1723 register tree name = DECL_NAME (x);
1724 register struct binding_level *b = current_binding_level;
1726 DECL_CONTEXT (x) = current_function_decl;
1727 /* A local extern declaration for a function doesn't constitute nesting.
1728 A local auto declaration does, since it's a forward decl
1729 for a nested function coming later. */
1730 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1731 && DECL_EXTERNAL (x))
1732 DECL_CONTEXT (x) = 0;
1734 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1735 && x != IDENTIFIER_IMPLICIT_DECL (name))
1736 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1743 t = lookup_name_current_level (name);
1744 if (t != 0 && t == error_mark_node)
1745 /* error_mark_node is 0 for a while during initialization! */
1748 error_with_decl (x, "`%s' used prior to declaration");
1753 file = DECL_SOURCE_FILE (t);
1754 line = DECL_SOURCE_LINE (t);
1757 if (t != 0 && duplicate_decls (x, t))
1759 if (TREE_CODE (t) == PARM_DECL)
1761 /* Don't allow more than one "real" duplicate
1762 of a forward parm decl. */
1763 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1766 /* If this decl is `static' and an implicit decl was seen previously,
1767 warn. But don't complain if -traditional,
1768 since traditional compilers don't complain. */
1769 if (!flag_traditional && TREE_PUBLIC (name)
1770 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1771 /* We used to warn also for explicit extern followed by static,
1772 but sometimes you need to do it that way. */
1773 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1775 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1776 IDENTIFIER_POINTER (name));
1777 pedwarn_with_file_and_line (file, line,
1778 "previous declaration of `%s'",
1779 IDENTIFIER_POINTER (name));
1785 /* If we are processing a typedef statement, generate a whole new
1786 ..._TYPE node (which will be just an variant of the existing
1787 ..._TYPE node with identical properties) and then install the
1788 TYPE_DECL node generated to represent the typedef name as the
1789 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1791 The whole point here is to end up with a situation where each
1792 and every ..._TYPE node the compiler creates will be uniquely
1793 associated with AT MOST one node representing a typedef name.
1794 This way, even though the compiler substitutes corresponding
1795 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1796 early on, later parts of the compiler can always do the reverse
1797 translation and get back the corresponding typedef name. For
1800 typedef struct S MY_TYPE;
1803 Later parts of the compiler might only know that `object' was of
1804 type `struct S' if if were not for code just below. With this
1805 code however, later parts of the compiler see something like:
1807 struct S' == struct S
1808 typedef struct S' MY_TYPE;
1811 And they can then deduce (from the node for type struct S') that
1812 the original object declaration was:
1816 Being able to do this is important for proper support of protoize,
1817 and also for generating precise symbolic debugging information
1818 which takes full account of the programmer's (typedef) vocabulary.
1820 Obviously, we don't want to generate a duplicate ..._TYPE node if
1821 the TYPE_DECL node that we are now processing really represents a
1822 standard built-in type.
1824 Since all standard types are effectively declared at line zero
1825 in the source file, we can easily check to see if we are working
1826 on a standard type by checking the current value of lineno. */
1828 if (TREE_CODE (x) == TYPE_DECL)
1830 if (DECL_SOURCE_LINE (x) == 0)
1832 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1833 TYPE_NAME (TREE_TYPE (x)) = x;
1837 tree tt = TREE_TYPE (x);
1839 tt = build_type_copy (tt);
1845 /* Multiple external decls of the same identifier ought to match.
1846 Check against both global declarations and out of scope (limbo) block
1849 We get warnings about inline functions where they are defined.
1850 Avoid duplicate warnings where they are used. */
1851 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
1855 if (IDENTIFIER_GLOBAL_VALUE (name) != 0
1856 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
1857 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
1858 decl = IDENTIFIER_GLOBAL_VALUE (name);
1859 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
1860 /* Decls in limbo are always extern, so no need to check that. */
1861 decl = IDENTIFIER_LIMBO_VALUE (name);
1865 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1866 /* If old decl is built-in, we already warned if we should. */
1867 && !DECL_BUILT_IN (decl))
1869 pedwarn_with_decl (x,
1870 "type mismatch with previous external decl");
1871 pedwarn_with_decl (decl, "previous external decl of `%s'");
1875 /* If a function has had an implicit declaration, and then is defined,
1876 make sure they are compatible. */
1878 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1879 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1880 && TREE_CODE (x) == FUNCTION_DECL
1881 && ! comptypes (TREE_TYPE (x),
1882 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1884 warning_with_decl (x, "type mismatch with previous implicit declaration");
1885 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1886 "previous implicit declaration of `%s'");
1889 /* In PCC-compatibility mode, extern decls of vars with no current decl
1890 take effect at top level no matter where they are. */
1891 if (flag_traditional && DECL_EXTERNAL (x)
1892 && lookup_name (name) == 0)
1894 tree type = TREE_TYPE (x);
1896 /* But don't do this if the type contains temporary nodes. */
1899 if (type == error_mark_node)
1901 if (! TREE_PERMANENT (type))
1903 warning_with_decl (x, "type of external `%s' is not global");
1904 /* By exiting the loop early, we leave TYPE nonzero,
1905 and thus prevent globalization of the decl. */
1908 else if (TREE_CODE (type) == FUNCTION_TYPE
1909 && TYPE_ARG_TYPES (type) != 0)
1910 /* The types might not be truly local,
1911 but the list of arg types certainly is temporary.
1912 Since prototypes are nontraditional,
1913 ok not to do the traditional thing. */
1915 type = TREE_TYPE (type);
1919 b = global_binding_level;
1922 /* This name is new in its binding level.
1923 Install the new declaration and return it. */
1924 if (b == global_binding_level)
1926 /* Install a global value. */
1928 /* If the first global decl has external linkage,
1929 warn if we later see static one. */
1930 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1931 TREE_PUBLIC (name) = 1;
1933 IDENTIFIER_GLOBAL_VALUE (name) = x;
1935 /* We no longer care about any previous block level declarations. */
1936 IDENTIFIER_LIMBO_VALUE (name) = 0;
1938 /* Don't forget if the function was used via an implicit decl. */
1939 if (IDENTIFIER_IMPLICIT_DECL (name)
1940 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
1941 TREE_USED (x) = 1, TREE_USED (name) = 1;
1943 /* Don't forget if its address was taken in that way. */
1944 if (IDENTIFIER_IMPLICIT_DECL (name)
1945 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
1946 TREE_ADDRESSABLE (x) = 1;
1948 /* Warn about mismatches against previous implicit decl. */
1949 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1950 /* If this real decl matches the implicit, don't complain. */
1951 && ! (TREE_CODE (x) == FUNCTION_DECL
1952 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
1953 == integer_type_node)))
1954 pedwarn ("`%s' was previously implicitly declared to return `int'",
1955 IDENTIFIER_POINTER (name));
1957 /* If this decl is `static' and an `extern' was seen previously,
1958 that is erroneous. */
1959 if (TREE_PUBLIC (name)
1960 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
1962 /* Okay to redeclare an ANSI built-in as static. */
1963 if (t != 0 && DECL_BUILT_IN (t))
1965 /* Okay to declare a non-ANSI built-in as anything. */
1966 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
1968 else if (IDENTIFIER_IMPLICIT_DECL (name))
1969 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1970 IDENTIFIER_POINTER (name));
1972 pedwarn ("`%s' was declared `extern' and later `static'",
1973 IDENTIFIER_POINTER (name));
1978 /* Here to install a non-global value. */
1979 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
1980 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
1981 IDENTIFIER_LOCAL_VALUE (name) = x;
1983 /* If this is an extern function declaration, see if we
1984 have a global definition or declaration for the function. */
1986 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
1988 && TREE_CODE (x) == FUNCTION_DECL
1989 && TREE_CODE (oldglobal) == FUNCTION_DECL)
1991 /* We have one. Their types must agree. */
1992 if (! comptypes (TREE_TYPE (x),
1993 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
1994 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
1997 /* Inner extern decl is inline if global one is.
1998 Copy enough to really inline it. */
1999 if (DECL_INLINE (oldglobal))
2001 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2002 DECL_INITIAL (x) = (current_function_decl == oldglobal
2003 ? 0 : DECL_INITIAL (oldglobal));
2004 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2005 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2006 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2007 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2008 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2010 /* Inner extern decl is built-in if global one is. */
2011 if (DECL_BUILT_IN (oldglobal))
2013 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2014 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
2016 /* Keep the arg types from a file-scope fcn defn. */
2017 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2018 && DECL_INITIAL (oldglobal)
2019 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2020 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2024 #if 0 /* This case is probably sometimes the right thing to do. */
2025 /* If we have a local external declaration,
2026 then any file-scope declaration should not
2027 have been static. */
2028 if (oldlocal == 0 && oldglobal != 0
2029 && !TREE_PUBLIC (oldglobal)
2030 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2031 warning ("`%s' locally external but globally static",
2032 IDENTIFIER_POINTER (name));
2035 /* If we have a local external declaration,
2036 and no file-scope declaration has yet been seen,
2037 then if we later have a file-scope decl it must not be static. */
2040 && DECL_EXTERNAL (x)
2043 TREE_PUBLIC (name) = 1;
2045 /* Save this decl, so that we can do type checking against
2046 other decls after it falls out of scope.
2048 Only save it once. This prevents temporary decls created in
2049 expand_inline_function from being used here, since this
2050 will have been set when the inline function was parsed.
2051 It also helps give slightly better warnings. */
2052 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2053 IDENTIFIER_LIMBO_VALUE (name) = x;
2056 /* Warn if shadowing an argument at the top level of the body. */
2057 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2058 /* This warning doesn't apply to the parms of a nested fcn. */
2059 && ! current_binding_level->parm_flag
2060 /* Check that this is one level down from the parms. */
2061 && current_binding_level->level_chain->parm_flag
2062 /* Check that the decl being shadowed
2063 comes from the parm level, one level up. */
2064 && chain_member (oldlocal, current_binding_level->level_chain->names))
2066 if (TREE_CODE (oldlocal) == PARM_DECL)
2067 pedwarn ("declaration of `%s' shadows a parameter",
2068 IDENTIFIER_POINTER (name));
2070 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2071 IDENTIFIER_POINTER (name));
2074 /* Maybe warn if shadowing something else. */
2075 else if (warn_shadow && !DECL_EXTERNAL (x)
2076 /* No shadow warnings for internally generated vars. */
2077 && DECL_SOURCE_LINE (x) != 0
2078 /* No shadow warnings for vars made for inlining. */
2079 && ! DECL_FROM_INLINE (x))
2081 char *warnstring = 0;
2083 if (TREE_CODE (x) == PARM_DECL
2084 && current_binding_level->level_chain->parm_flag)
2085 /* Don't warn about the parm names in function declarator
2086 within a function declarator.
2087 It would be nice to avoid warning in any function
2088 declarator in a declaration, as opposed to a definition,
2089 but there is no way to tell it's not a definition. */
2091 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2092 warnstring = "declaration of `%s' shadows a parameter";
2093 else if (oldlocal != 0)
2094 warnstring = "declaration of `%s' shadows previous local";
2095 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2096 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2097 warnstring = "declaration of `%s' shadows global declaration";
2100 warning (warnstring, IDENTIFIER_POINTER (name));
2103 /* If storing a local value, there may already be one (inherited).
2104 If so, record it for restoration when this binding level ends. */
2106 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2109 /* Keep count of variables in this level with incomplete type. */
2110 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2114 /* Put decls on list in reverse order.
2115 We will reverse them later if necessary. */
2116 TREE_CHAIN (x) = b->names;
2122 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2125 pushdecl_top_level (x)
2129 register struct binding_level *b = current_binding_level;
2131 current_binding_level = global_binding_level;
2133 current_binding_level = b;
2137 /* Generate an implicit declaration for identifier FUNCTIONID
2138 as a function of type int (). Print a warning if appropriate. */
2141 implicitly_declare (functionid)
2145 int traditional_warning = 0;
2146 /* Only one "implicit declaration" warning per identifier. */
2147 int implicit_warning;
2149 /* Save the decl permanently so we can warn if definition follows. */
2150 push_obstacks_nochange ();
2151 end_temporary_allocation ();
2153 /* We used to reuse an old implicit decl here,
2154 but this loses with inline functions because it can clobber
2155 the saved decl chains. */
2156 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2157 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2159 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2161 /* Warn of implicit decl following explicit local extern decl.
2162 This is probably a program designed for traditional C. */
2163 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2164 traditional_warning = 1;
2166 /* Warn once of an implicit declaration. */
2167 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2169 DECL_EXTERNAL (decl) = 1;
2170 TREE_PUBLIC (decl) = 1;
2172 /* Record that we have an implicit decl and this is it. */
2173 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2175 /* ANSI standard says implicit declarations are in the innermost block.
2176 So we record the decl in the standard fashion.
2177 If flag_traditional is set, pushdecl does it top-level. */
2180 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2181 maybe_objc_check_decl (decl);
2183 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2185 if (warn_implicit && implicit_warning)
2186 warning ("implicit declaration of function `%s'",
2187 IDENTIFIER_POINTER (functionid));
2188 else if (warn_traditional && traditional_warning)
2189 warning ("function `%s' was previously declared within a block",
2190 IDENTIFIER_POINTER (functionid));
2192 /* Write a record describing this implicit function declaration to the
2193 prototypes file (if requested). */
2195 gen_aux_info_record (decl, 0, 1, 0);
2202 /* Return zero if the declaration NEWDECL is valid
2203 when the declaration OLDDECL (assumed to be for the same name)
2204 has already been seen.
2205 Otherwise return an error message format string with a %s
2206 where the identifier should go. */
2209 redeclaration_error_message (newdecl, olddecl)
2210 tree newdecl, olddecl;
2212 if (TREE_CODE (newdecl) == TYPE_DECL)
2214 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2216 return "redefinition of `%s'";
2218 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2220 /* Declarations of functions can insist on internal linkage
2221 but they can't be inconsistent with internal linkage,
2222 so there can be no error on that account.
2223 However defining the same name twice is no good. */
2224 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2225 /* However, defining once as extern inline and a second
2226 time in another way is ok. */
2227 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2228 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2229 return "redefinition of `%s'";
2232 else if (current_binding_level == global_binding_level)
2234 /* Objects declared at top level: */
2235 /* If at least one is a reference, it's ok. */
2236 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2238 /* Reject two definitions. */
2239 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2240 return "redefinition of `%s'";
2241 /* Now we have two tentative defs, or one tentative and one real def. */
2242 /* Insist that the linkage match. */
2243 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2244 return "conflicting declarations of `%s'";
2247 else if (current_binding_level->parm_flag
2248 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2252 /* Objects declared with block scope: */
2253 /* Reject two definitions, and reject a definition
2254 together with an external reference. */
2255 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl)))
2256 return "redeclaration of `%s'";
2261 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2262 Create one if none exists so far for the current function.
2263 This function is called for both label definitions and label references. */
2269 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2271 if (current_function_decl == 0)
2273 error ("label %s referenced outside of any function",
2274 IDENTIFIER_POINTER (id));
2278 /* Use a label already defined or ref'd with this name. */
2281 /* But not if it is inherited and wasn't declared to be inheritable. */
2282 if (DECL_CONTEXT (decl) != current_function_decl
2283 && ! C_DECLARED_LABEL_FLAG (decl))
2284 return shadow_label (id);
2288 decl = build_decl (LABEL_DECL, id, void_type_node);
2290 /* Make sure every label has an rtx. */
2293 /* A label not explicitly declared must be local to where it's ref'd. */
2294 DECL_CONTEXT (decl) = current_function_decl;
2296 DECL_MODE (decl) = VOIDmode;
2298 /* Say where one reference is to the label,
2299 for the sake of the error if it is not defined. */
2300 DECL_SOURCE_LINE (decl) = lineno;
2301 DECL_SOURCE_FILE (decl) = input_filename;
2303 IDENTIFIER_LABEL_VALUE (id) = decl;
2305 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2310 /* Make a label named NAME in the current function,
2311 shadowing silently any that may be inherited from containing functions
2312 or containing scopes.
2314 Note that valid use, if the label being shadowed
2315 comes from another scope in the same function,
2316 requires calling declare_nonlocal_label right away. */
2322 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2326 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2327 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2330 return lookup_label (name);
2333 /* Define a label, specifying the location in the source file.
2334 Return the LABEL_DECL node for the label, if the definition is valid.
2335 Otherwise return 0. */
2338 define_label (filename, line, name)
2343 tree decl = lookup_label (name);
2345 /* If label with this name is known from an outer context, shadow it. */
2346 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2348 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2349 IDENTIFIER_LABEL_VALUE (name) = 0;
2350 decl = lookup_label (name);
2353 if (DECL_INITIAL (decl) != 0)
2355 error_with_decl (decl, "duplicate label `%s'");
2360 /* Mark label as having been defined. */
2361 DECL_INITIAL (decl) = error_mark_node;
2362 /* Say where in the source. */
2363 DECL_SOURCE_FILE (decl) = filename;
2364 DECL_SOURCE_LINE (decl) = line;
2369 /* Return the list of declarations of the current level.
2370 Note that this list is in reverse order unless/until
2371 you nreverse it; and when you do nreverse it, you must
2372 store the result back using `storedecls' or you will lose. */
2377 return current_binding_level->names;
2380 /* Return the list of type-tags (for structs, etc) of the current level. */
2385 return current_binding_level->tags;
2388 /* Store the list of declarations of the current level.
2389 This is done for the parameter declarations of a function being defined,
2390 after they are modified in the light of any missing parameters. */
2396 current_binding_level->names = decls;
2399 /* Similarly, store the list of tags of the current level. */
2405 current_binding_level->tags = tags;
2408 /* Given NAME, an IDENTIFIER_NODE,
2409 return the structure (or union or enum) definition for that name.
2410 Searches binding levels from BINDING_LEVEL up to the global level.
2411 If THISLEVEL_ONLY is nonzero, searches only the specified context
2412 (but skips any tag-transparent contexts to find one that is
2413 meaningful for tags).
2414 CODE says which kind of type the caller wants;
2415 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2416 If the wrong kind of type is found, an error is reported. */
2419 lookup_tag (code, name, binding_level, thislevel_only)
2420 enum tree_code code;
2421 struct binding_level *binding_level;
2425 register struct binding_level *level;
2427 for (level = binding_level; level; level = level->level_chain)
2430 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2432 if (TREE_PURPOSE (tail) == name)
2434 if (TREE_CODE (TREE_VALUE (tail)) != code)
2436 /* Definition isn't the kind we were looking for. */
2437 pending_invalid_xref = name;
2438 pending_invalid_xref_file = input_filename;
2439 pending_invalid_xref_line = lineno;
2441 return TREE_VALUE (tail);
2444 if (thislevel_only && ! level->tag_transparent)
2450 /* Print an error message now
2451 for a recent invalid struct, union or enum cross reference.
2452 We don't print them immediately because they are not invalid
2453 when used in the `struct foo;' construct for shadowing. */
2456 pending_xref_error ()
2458 if (pending_invalid_xref != 0)
2459 error_with_file_and_line (pending_invalid_xref_file,
2460 pending_invalid_xref_line,
2461 "`%s' defined as wrong kind of tag",
2462 IDENTIFIER_POINTER (pending_invalid_xref));
2463 pending_invalid_xref = 0;
2466 /* Given a type, find the tag that was defined for it and return the tag name.
2467 Otherwise return 0. */
2470 lookup_tag_reverse (type)
2473 register struct binding_level *level;
2475 for (level = current_binding_level; level; level = level->level_chain)
2478 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2480 if (TREE_VALUE (tail) == type)
2481 return TREE_PURPOSE (tail);
2487 /* Look up NAME in the current binding level and its superiors
2488 in the namespace of variables, functions and typedefs.
2489 Return a ..._DECL node of some kind representing its definition,
2490 or return 0 if it is undefined. */
2497 if (current_binding_level != global_binding_level
2498 && IDENTIFIER_LOCAL_VALUE (name))
2499 val = IDENTIFIER_LOCAL_VALUE (name);
2501 val = IDENTIFIER_GLOBAL_VALUE (name);
2505 /* Similar to `lookup_name' but look only at current binding level. */
2508 lookup_name_current_level (name)
2513 if (current_binding_level == global_binding_level)
2514 return IDENTIFIER_GLOBAL_VALUE (name);
2516 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2519 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2520 if (DECL_NAME (t) == name)
2526 /* Create the predefined scalar types of C,
2527 and some nodes representing standard constants (0, 1, (void *)0).
2528 Initialize the global binding level.
2529 Make definitions for built-in primitive functions. */
2532 init_decl_processing ()
2534 register tree endlink;
2535 /* Either char* or void*. */
2536 tree traditional_ptr_type_node;
2537 /* Data types of memcpy and strlen. */
2538 tree memcpy_ftype, strlen_ftype;
2539 tree void_ftype_any;
2540 int wchar_type_size;
2542 tree array_domain_type;
2544 current_function_decl = NULL;
2545 named_labels = NULL;
2546 current_binding_level = NULL_BINDING_LEVEL;
2547 free_binding_level = NULL_BINDING_LEVEL;
2548 pushlevel (0); /* make the binding_level structure for global names */
2549 global_binding_level = current_binding_level;
2551 /* Define `int' and `char' first so that dbx will output them first. */
2553 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2554 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2555 integer_type_node));
2557 /* Define `char', which is like either `signed char' or `unsigned char'
2558 but not the same as either. */
2562 ? make_signed_type (CHAR_TYPE_SIZE)
2563 : make_unsigned_type (CHAR_TYPE_SIZE));
2564 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2567 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2568 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2569 long_integer_type_node));
2571 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2572 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2573 unsigned_type_node));
2575 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2576 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2577 long_unsigned_type_node));
2579 /* `unsigned long' is the standard type for sizeof.
2580 Traditionally, use a signed type.
2581 Note that stddef.h uses `unsigned long',
2582 and this must agree, even of long and int are the same size. */
2583 if (flag_traditional)
2584 sizetype = long_integer_type_node;
2587 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2590 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2592 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2593 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2594 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2595 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2596 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2598 error_mark_node = make_node (ERROR_MARK);
2599 TREE_TYPE (error_mark_node) = error_mark_node;
2601 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2602 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2603 short_integer_type_node));
2605 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2606 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2607 long_long_integer_type_node));
2609 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2610 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2611 short_unsigned_type_node));
2613 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2614 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2615 long_long_unsigned_type_node));
2617 /* Define both `signed char' and `unsigned char'. */
2618 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2619 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2620 signed_char_type_node));
2622 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2623 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2624 unsigned_char_type_node));
2626 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2627 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2629 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2630 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2632 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2633 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2635 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2636 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2638 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2639 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2641 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2642 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2644 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2645 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2647 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2648 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2650 float_type_node = make_node (REAL_TYPE);
2651 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2652 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2654 layout_type (float_type_node);
2656 double_type_node = make_node (REAL_TYPE);
2657 if (flag_short_double)
2658 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2660 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2661 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2663 layout_type (double_type_node);
2665 long_double_type_node = make_node (REAL_TYPE);
2666 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2667 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2668 long_double_type_node));
2669 layout_type (long_double_type_node);
2671 complex_integer_type_node = make_node (COMPLEX_TYPE);
2672 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2673 complex_integer_type_node));
2674 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2675 layout_type (complex_integer_type_node);
2677 complex_float_type_node = make_node (COMPLEX_TYPE);
2678 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2679 complex_float_type_node));
2680 TREE_TYPE (complex_float_type_node) = float_type_node;
2681 layout_type (complex_float_type_node);
2683 complex_double_type_node = make_node (COMPLEX_TYPE);
2684 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2685 complex_double_type_node));
2686 TREE_TYPE (complex_double_type_node) = double_type_node;
2687 layout_type (complex_double_type_node);
2689 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2690 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2691 complex_long_double_type_node));
2692 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2693 layout_type (complex_long_double_type_node);
2696 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2697 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2698 signed_wchar_type_node = type_for_size (wchar_type_size, 0);
2699 unsigned_wchar_type_node = type_for_size (wchar_type_size, 1);
2701 integer_zero_node = build_int_2 (0, 0);
2702 TREE_TYPE (integer_zero_node) = integer_type_node;
2703 integer_one_node = build_int_2 (1, 0);
2704 TREE_TYPE (integer_one_node) = integer_type_node;
2706 size_zero_node = build_int_2 (0, 0);
2707 TREE_TYPE (size_zero_node) = sizetype;
2708 size_one_node = build_int_2 (1, 0);
2709 TREE_TYPE (size_one_node) = sizetype;
2711 void_type_node = make_node (VOID_TYPE);
2712 pushdecl (build_decl (TYPE_DECL,
2713 ridpointers[(int) RID_VOID], void_type_node));
2714 layout_type (void_type_node); /* Uses integer_zero_node */
2715 /* We are not going to have real types in C with less than byte alignment,
2716 so we might as well not have any types that claim to have it. */
2717 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2719 null_pointer_node = build_int_2 (0, 0);
2720 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2721 layout_type (TREE_TYPE (null_pointer_node));
2723 string_type_node = build_pointer_type (char_type_node);
2724 const_string_type_node
2725 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2727 /* Make a type to be the domain of a few array types
2728 whose domains don't really matter.
2729 200 is small enough that it always fits in size_t
2730 and large enough that it can hold most function names for the
2731 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2732 array_domain_type = build_index_type (build_int_2 (200, 0));
2734 /* make a type for arrays of characters.
2735 With luck nothing will ever really depend on the length of this
2737 char_array_type_node
2738 = build_array_type (char_type_node, array_domain_type);
2739 /* Likewise for arrays of ints. */
2741 = build_array_type (integer_type_node, array_domain_type);
2742 /* This is for wide string constants. */
2743 wchar_array_type_node
2744 = build_array_type (wchar_type_node, array_domain_type);
2746 default_function_type
2747 = build_function_type (integer_type_node, NULL_TREE);
2749 ptr_type_node = build_pointer_type (void_type_node);
2751 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2753 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2756 = build_function_type (void_type_node, NULL_TREE);
2759 = build_function_type (double_type_node,
2760 tree_cons (NULL_TREE, double_type_node, endlink));
2762 double_ftype_double_double
2763 = build_function_type (double_type_node,
2764 tree_cons (NULL_TREE, double_type_node,
2765 tree_cons (NULL_TREE,
2766 double_type_node, endlink)));
2769 = build_function_type (integer_type_node,
2770 tree_cons (NULL_TREE, integer_type_node, endlink));
2773 = build_function_type (long_integer_type_node,
2774 tree_cons (NULL_TREE,
2775 long_integer_type_node, endlink));
2777 void_ftype_ptr_ptr_int
2778 = build_function_type (void_type_node,
2779 tree_cons (NULL_TREE, ptr_type_node,
2780 tree_cons (NULL_TREE, ptr_type_node,
2781 tree_cons (NULL_TREE,
2785 int_ftype_cptr_cptr_sizet
2786 = build_function_type (integer_type_node,
2787 tree_cons (NULL_TREE, const_ptr_type_node,
2788 tree_cons (NULL_TREE, const_ptr_type_node,
2789 tree_cons (NULL_TREE,
2793 void_ftype_ptr_int_int
2794 = build_function_type (void_type_node,
2795 tree_cons (NULL_TREE, ptr_type_node,
2796 tree_cons (NULL_TREE, integer_type_node,
2797 tree_cons (NULL_TREE,
2801 string_ftype_ptr_ptr /* strcpy prototype */
2802 = build_function_type (string_type_node,
2803 tree_cons (NULL_TREE, string_type_node,
2804 tree_cons (NULL_TREE,
2805 const_string_type_node,
2808 int_ftype_string_string /* strcmp prototype */
2809 = build_function_type (integer_type_node,
2810 tree_cons (NULL_TREE, const_string_type_node,
2811 tree_cons (NULL_TREE,
2812 const_string_type_node,
2815 strlen_ftype /* strlen prototype */
2816 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2817 tree_cons (NULL_TREE, const_string_type_node,
2820 traditional_ptr_type_node
2821 = (flag_traditional ? string_type_node : ptr_type_node);
2823 memcpy_ftype /* memcpy prototype */
2824 = build_function_type (traditional_ptr_type_node,
2825 tree_cons (NULL_TREE, ptr_type_node,
2826 tree_cons (NULL_TREE, const_ptr_type_node,
2827 tree_cons (NULL_TREE,
2831 builtin_function ("__builtin_constant_p", int_ftype_int,
2832 BUILT_IN_CONSTANT_P, NULL_PTR);
2834 builtin_function ("__builtin_return_address",
2835 build_function_type (ptr_type_node,
2836 tree_cons (NULL_TREE,
2839 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2841 builtin_function ("__builtin_frame_address",
2842 build_function_type (ptr_type_node,
2843 tree_cons (NULL_TREE,
2846 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2848 builtin_function ("__builtin_alloca",
2849 build_function_type (ptr_type_node,
2850 tree_cons (NULL_TREE,
2853 BUILT_IN_ALLOCA, "alloca");
2854 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2855 /* Define alloca, ffs as builtins.
2856 Declare _exit just to mark it as volatile. */
2857 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2859 temp = builtin_function ("alloca",
2860 build_function_type (ptr_type_node,
2861 tree_cons (NULL_TREE,
2864 BUILT_IN_ALLOCA, NULL_PTR);
2865 /* Suppress error if redefined as a non-function. */
2866 DECL_BUILT_IN_NONANSI (temp) = 1;
2867 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2868 /* Suppress error if redefined as a non-function. */
2869 DECL_BUILT_IN_NONANSI (temp) = 1;
2870 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2872 TREE_THIS_VOLATILE (temp) = 1;
2873 TREE_SIDE_EFFECTS (temp) = 1;
2874 /* Suppress error if redefined as a non-function. */
2875 DECL_BUILT_IN_NONANSI (temp) = 1;
2878 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2879 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2881 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2883 builtin_function ("__builtin_saveregs",
2884 build_function_type (ptr_type_node, NULL_TREE),
2885 BUILT_IN_SAVEREGS, NULL_PTR);
2886 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2888 builtin_function ("__builtin_varargs",
2889 build_function_type (ptr_type_node,
2890 tree_cons (NULL_TREE,
2893 BUILT_IN_VARARGS, NULL_PTR);
2895 builtin_function ("__builtin_classify_type", default_function_type,
2896 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2897 builtin_function ("__builtin_next_arg",
2898 build_function_type (ptr_type_node, endlink),
2899 BUILT_IN_NEXT_ARG, NULL_PTR);
2900 builtin_function ("__builtin_args_info",
2901 build_function_type (integer_type_node,
2902 tree_cons (NULL_TREE,
2905 BUILT_IN_ARGS_INFO, NULL_PTR);
2907 /* Currently under experimentation. */
2908 builtin_function ("__builtin_memcpy", memcpy_ftype,
2909 BUILT_IN_MEMCPY, "memcpy");
2910 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
2911 BUILT_IN_MEMCMP, "memcmp");
2912 builtin_function ("__builtin_strcmp", int_ftype_string_string,
2913 BUILT_IN_STRCMP, "strcmp");
2914 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
2915 BUILT_IN_STRCPY, "strcpy");
2916 builtin_function ("__builtin_strlen", strlen_ftype,
2917 BUILT_IN_STRLEN, "strlen");
2918 builtin_function ("__builtin_fsqrt", double_ftype_double,
2919 BUILT_IN_FSQRT, "sqrt");
2920 builtin_function ("__builtin_sin", double_ftype_double,
2921 BUILT_IN_SIN, "sin");
2922 builtin_function ("__builtin_cos", double_ftype_double,
2923 BUILT_IN_COS, "cos");
2925 /* In an ANSI C program, it is okay to supply built-in meanings
2926 for these functions, since applications cannot validly use them
2927 with any other meaning.
2928 However, honor the -fno-builtin option. */
2929 if (!flag_no_builtin)
2931 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2932 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
2933 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
2934 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
2935 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
2937 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
2939 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
2941 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
2942 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
2943 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
2944 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
2946 /* Declare these functions volatile
2947 to avoid spurious "control drops through" warnings. */
2948 /* Don't specify the argument types, to avoid errors
2949 from certain code which isn't valid in ANSI but which exists. */
2950 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
2952 TREE_THIS_VOLATILE (temp) = 1;
2953 TREE_SIDE_EFFECTS (temp) = 1;
2954 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
2955 TREE_THIS_VOLATILE (temp) = 1;
2956 TREE_SIDE_EFFECTS (temp) = 1;
2960 /* Support for these has not been written in either expand_builtin
2961 or build_function_call. */
2962 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
2963 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
2964 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
2966 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
2968 builtin_function ("__builtin_fmod", double_ftype_double_double,
2969 BUILT_IN_FMOD, NULL_PTR);
2970 builtin_function ("__builtin_frem", double_ftype_double_double,
2971 BUILT_IN_FREM, NULL_PTR);
2972 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
2973 BUILT_IN_MEMSET, NULL_PTR);
2974 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
2976 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
2980 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
2981 declare_function_name ();
2983 start_identifier_warnings ();
2985 init_format_info_table ();
2990 /* Return a definition for a builtin function named NAME and whose data type
2991 is TYPE. TYPE should be a function type with argument types.
2992 FUNCTION_CODE tells later passes how to compile calls to this function.
2993 See tree.h for its possible values.
2995 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2996 the name to be called if we can't opencode the function. */
2999 builtin_function (name, type, function_code, library_name)
3002 enum built_in_function function_code;
3005 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3006 DECL_EXTERNAL (decl) = 1;
3007 TREE_PUBLIC (decl) = 1;
3008 /* If -traditional, permit redefining a builtin function any way you like.
3009 (Though really, if the program redefines these functions,
3010 it probably won't work right unless compiled with -fno-builtin.) */
3011 if (flag_traditional && name[0] != '_')
3012 DECL_BUILT_IN_NONANSI (decl) = 1;
3014 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3015 make_decl_rtl (decl, NULL_PTR, 1);
3017 if (function_code != NOT_BUILT_IN)
3019 DECL_BUILT_IN (decl) = 1;
3020 DECL_SET_FUNCTION_CODE (decl, function_code);
3022 /* Warn if a function in the namespace for users
3023 is used without an occasion to consider it declared. */
3024 if (name[0] != '_' || name[1] != '_')
3025 C_DECL_ANTICIPATED (decl) = 1;
3030 /* Called when a declaration is seen that contains no names to declare.
3031 If its type is a reference to a structure, union or enum inherited
3032 from a containing scope, shadow that tag name for the current scope
3033 with a forward reference.
3034 If its type defines a new named structure or union
3035 or defines an enum, it is valid but we need not do anything here.
3036 Otherwise, it is an error. */
3039 shadow_tag (declspecs)
3042 shadow_tag_warned (declspecs, 0);
3046 shadow_tag_warned (declspecs, warned)
3053 pending_invalid_xref = 0;
3055 for (link = declspecs; link; link = TREE_CHAIN (link))
3057 register tree value = TREE_VALUE (link);
3058 register enum tree_code code = TREE_CODE (value);
3060 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3061 /* Used to test also that TYPE_SIZE (value) != 0.
3062 That caused warning for `struct foo;' at top level in the file. */
3064 register tree name = lookup_tag_reverse (value);
3071 if (!warned && code != ENUMERAL_TYPE) /* Empty unnamed enum OK */
3073 pedwarn ("unnamed struct/union that defines no instances");
3079 t = lookup_tag (code, name, current_binding_level, 1);
3083 t = make_node (code);
3091 pedwarn ("useless keyword or type name in empty declaration");
3099 error ("two types specified in one empty declaration");
3101 pedwarn ("empty declaration");
3105 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3108 groktypename (typename)
3111 if (TREE_CODE (typename) != TREE_LIST)
3113 return grokdeclarator (TREE_VALUE (typename),
3114 TREE_PURPOSE (typename),
3118 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3121 groktypename_in_parm_context (typename)
3124 if (TREE_CODE (typename) != TREE_LIST)
3126 return grokdeclarator (TREE_VALUE (typename),
3127 TREE_PURPOSE (typename),
3131 /* Decode a declarator in an ordinary declaration or data definition.
3132 This is called as soon as the type information and variable name
3133 have been parsed, before parsing the initializer if any.
3134 Here we create the ..._DECL node, fill in its type,
3135 and put it on the list of decls for the current context.
3136 The ..._DECL node is returned as the value.
3138 Exception: for arrays where the length is not specified,
3139 the type is left null, to be filled in by `finish_decl'.
3141 Function definitions do not come here; they go to start_function
3142 instead. However, external and forward declarations of functions
3143 do go through here. Structure field declarations are done by
3144 grokfield and not through here. */
3146 /* Set this to zero to debug not using the temporary obstack
3147 to parse initializers. */
3148 int debug_temp_inits = 1;
3151 start_decl (declarator, declspecs, initialized)
3152 tree declarator, declspecs;
3155 register tree decl = grokdeclarator (declarator, declspecs,
3156 NORMAL, initialized);
3158 int init_written = initialized;
3160 /* The corresponding pop_obstacks is in finish_decl. */
3161 push_obstacks_nochange ();
3164 /* Is it valid for this decl to have an initializer at all?
3165 If not, set INITIALIZED to zero, which will indirectly
3166 tell `finish_decl' to ignore the initializer once it is parsed. */
3167 switch (TREE_CODE (decl))
3170 /* typedef foo = bar means give foo the same type as bar.
3171 We haven't parsed bar yet, so `finish_decl' will fix that up.
3172 Any other case of an initialization in a TYPE_DECL is an error. */
3173 if (pedantic || list_length (declspecs) > 1)
3175 error ("typedef `%s' is initialized",
3176 IDENTIFIER_POINTER (DECL_NAME (decl)));
3182 error ("function `%s' is initialized like a variable",
3183 IDENTIFIER_POINTER (DECL_NAME (decl)));
3188 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3189 error ("parameter `%s' is initialized",
3190 IDENTIFIER_POINTER (DECL_NAME (decl)));
3195 /* Don't allow initializations for incomplete types
3196 except for arrays which might be completed by the initialization. */
3197 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3199 /* A complete type is ok if size is fixed. */
3201 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3202 || C_DECL_VARIABLE_SIZE (decl))
3204 error ("variable-sized object may not be initialized");
3208 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3210 error ("variable `%s' has initializer but incomplete type",
3211 IDENTIFIER_POINTER (DECL_NAME (decl)));
3214 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3216 error ("elements of array `%s' have incomplete type",
3217 IDENTIFIER_POINTER (DECL_NAME (decl)));
3224 #if 0 /* Seems redundant with grokdeclarator. */
3225 if (current_binding_level != global_binding_level
3226 && DECL_EXTERNAL (decl)
3227 && TREE_CODE (decl) != FUNCTION_DECL)
3228 warning ("declaration of `%s' has `extern' and is initialized",
3229 IDENTIFIER_POINTER (DECL_NAME (decl)));
3231 DECL_EXTERNAL (decl) = 0;
3232 if (current_binding_level == global_binding_level)
3233 TREE_STATIC (decl) = 1;
3235 /* Tell `pushdecl' this is an initialized decl
3236 even though we don't yet have the initializer expression.
3237 Also tell `finish_decl' it may store the real initializer. */
3238 DECL_INITIAL (decl) = error_mark_node;
3241 /* If this is a function declaration, write a record describing it to the
3242 prototypes file (if requested). */
3244 if (TREE_CODE (decl) == FUNCTION_DECL)
3245 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3247 /* Add this decl to the current binding level.
3248 TEM may equal DECL or it may be a previous decl of the same name. */
3249 tem = pushdecl (decl);
3251 /* For a local variable, define the RTL now. */
3252 if (current_binding_level != global_binding_level
3253 /* But not if this is a duplicate decl
3254 and we preserved the rtl from the previous one
3255 (which may or may not happen). */
3256 && DECL_RTL (tem) == 0)
3258 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3260 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3261 && DECL_INITIAL (tem) != 0)
3267 /* When parsing and digesting the initializer,
3268 use temporary storage. Do this even if we will ignore the value. */
3269 if (current_binding_level == global_binding_level && debug_temp_inits)
3270 temporary_allocation ();
3276 /* Finish processing of a declaration;
3277 install its initial value.
3278 If the length of an array type is not known before,
3279 it must be determined now, from the initial value, or it is an error. */
3282 finish_decl (decl, init, asmspec_tree)
3286 register tree type = TREE_TYPE (decl);
3287 int was_incomplete = (DECL_SIZE (decl) == 0);
3288 int temporary = allocation_temporary_p ();
3292 asmspec = TREE_STRING_POINTER (asmspec_tree);
3294 /* If `start_decl' didn't like having an initialization, ignore it now. */
3296 if (init != 0 && DECL_INITIAL (decl) == 0)
3298 /* Don't crash if parm is initialized. */
3299 if (TREE_CODE (decl) == PARM_DECL)
3302 if (ITERATOR_P (decl))
3305 error_with_decl (decl, "iterator has no initial value");
3307 init = save_expr (init);
3312 if (TREE_CODE (decl) != TYPE_DECL)
3313 store_init_value (decl, init);
3316 /* typedef foo = bar; store the type of bar as the type of foo. */
3317 TREE_TYPE (decl) = TREE_TYPE (init);
3318 DECL_INITIAL (decl) = init = 0;
3322 /* Pop back to the obstack that is current for this binding level.
3323 This is because MAXINDEX, rtl, etc. to be made below
3324 must go in the permanent obstack. But don't discard the
3325 temporary data yet. */
3327 #if 0 /* pop_obstacks was near the end; this is what was here. */
3328 if (current_binding_level == global_binding_level && temporary)
3329 end_temporary_allocation ();
3332 /* Deduce size of array from initialization, if not already known */
3334 if (TREE_CODE (type) == ARRAY_TYPE
3335 && TYPE_DOMAIN (type) == 0
3336 && TREE_CODE (decl) != TYPE_DECL)
3339 = (TREE_STATIC (decl)
3340 /* Even if pedantic, an external linkage array
3341 may have incomplete type at first. */
3342 ? pedantic && !TREE_PUBLIC (decl)
3343 : !DECL_EXTERNAL (decl));
3345 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3347 /* Get the completed type made by complete_array_type. */
3348 type = TREE_TYPE (decl);
3351 error_with_decl (decl, "initializer fails to determine size of `%s'");
3356 error_with_decl (decl, "array size missing in `%s'");
3357 else if (!pedantic && TREE_STATIC (decl))
3358 /* ??? Perhaps should set TREE_PUBLIC here? */
3359 DECL_EXTERNAL (decl) = 1;
3362 if (pedantic && TYPE_DOMAIN (type) != 0
3363 && tree_int_cst_lt (TYPE_MAX_VALUE (TYPE_DOMAIN (type)),
3365 error_with_decl (decl, "zero-size array `%s'");
3367 layout_decl (decl, 0);
3370 if (TREE_CODE (decl) == VAR_DECL)
3372 if (DECL_SIZE (decl) == 0
3373 && (TREE_STATIC (decl)
3375 /* A static variable with an incomplete type
3376 is an error if it is initialized or `static'.
3377 Otherwise, let it through, but if it is not `extern'
3378 then it may cause an error message later. */
3379 !TREE_PUBLIC (decl) || DECL_INITIAL (decl)
3381 /* An automatic variable with an incomplete type
3383 !DECL_EXTERNAL (decl)))
3385 error_with_decl (decl, "storage size of `%s' isn't known");
3386 TREE_TYPE (decl) = error_mark_node;
3389 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3390 && DECL_SIZE (decl) != 0)
3392 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3393 constant_expression_warning (DECL_SIZE (decl));
3395 error_with_decl (decl, "storage size of `%s' isn't constant");
3399 /* Output the assembler code and/or RTL code for variables and functions,
3400 unless the type is an undefined structure or union.
3401 If not, it will get done when the type is completed. */
3403 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3405 if (flag_traditional && allocation_temporary_p ())
3407 push_obstacks_nochange ();
3408 end_temporary_allocation ();
3409 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3410 maybe_objc_check_decl (decl);
3411 rest_of_decl_compilation (decl, asmspec,
3412 current_binding_level == global_binding_level,
3418 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3419 maybe_objc_check_decl (decl);
3420 rest_of_decl_compilation (decl, asmspec,
3421 current_binding_level == global_binding_level,
3424 if (current_binding_level != global_binding_level)
3426 /* Recompute the RTL of a local array now
3427 if it used to be an incomplete type. */
3429 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3431 /* If we used it already as memory, it must stay in memory. */
3432 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3433 /* If it's still incomplete now, no init will save it. */
3434 if (DECL_SIZE (decl) == 0)
3435 DECL_INITIAL (decl) = 0;
3438 /* Compute and store the initial value. */
3439 if (TREE_CODE (decl) != FUNCTION_DECL)
3440 expand_decl_init (decl);
3444 if (TREE_CODE (decl) == TYPE_DECL)
3446 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3447 maybe_objc_check_decl (decl);
3448 rest_of_decl_compilation (decl, NULL_PTR,
3449 current_binding_level == global_binding_level,
3453 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3454 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3455 && temporary && TREE_PERMANENT (decl))
3457 /* We need to remember that this array HAD an initialization,
3458 but discard the actual temporary nodes,
3459 since we can't have a permanent node keep pointing to them. */
3460 /* We make an exception for inline functions, since it's
3461 normal for a local extern redeclaration of an inline function
3462 to have a copy of the top-level decl's DECL_INLINE. */
3463 if (DECL_INITIAL (decl) != 0)
3464 DECL_INITIAL (decl) = error_mark_node;
3468 /* Resume permanent allocation, if not within a function. */
3469 /* The corresponding push_obstacks_nochange is in start_decl,
3470 and in push_parm_decl and in grokfield. */
3474 /* If we have gone back from temporary to permanent allocation,
3475 actually free the temporary space that we no longer need. */
3476 if (temporary && !allocation_temporary_p ())
3477 permanent_allocation ();
3479 /* At the end of a declaration, throw away any variable type sizes
3480 of types defined inside that declaration. There is no use
3481 computing them in the following function definition. */
3482 if (current_binding_level == global_binding_level)
3483 get_pending_sizes ();
3486 /* If DECL has a cleanup, build and return that cleanup here.
3487 This is a callback called by expand_expr. */
3490 maybe_build_cleanup (decl)
3493 /* There are no cleanups in C. */
3497 /* Given a parsed parameter declaration,
3498 decode it into a PARM_DECL and push that on the current binding level.
3499 Also, for the sake of forward parm decls,
3500 record the given order of parms in `parm_order'. */
3503 push_parm_decl (parm)
3507 int old_immediate_size_expand = immediate_size_expand;
3508 /* Don't try computing parm sizes now -- wait till fn is called. */
3509 immediate_size_expand = 0;
3511 /* The corresponding pop_obstacks is in finish_decl. */
3512 push_obstacks_nochange ();
3514 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3515 if (DECL_NAME (decl))
3517 olddecl = lookup_name (DECL_NAME (decl));
3518 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3519 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3521 decl = pushdecl (decl);
3523 immediate_size_expand = old_immediate_size_expand;
3525 current_binding_level->parm_order
3526 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3528 /* Add this decl to the current binding level. */
3529 finish_decl (decl, NULL_TREE, NULL_TREE);
3532 /* Clear the given order of parms in `parm_order'.
3533 Used at start of parm list,
3534 and also at semicolon terminating forward decls. */
3539 current_binding_level->parm_order = NULL_TREE;
3542 /* Make TYPE a complete type based on INITIAL_VALUE.
3543 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3544 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3547 complete_array_type (type, initial_value, do_default)
3552 register tree maxindex = NULL_TREE;
3557 /* Note MAXINDEX is really the maximum index,
3558 one less than the size. */
3559 if (TREE_CODE (initial_value) == STRING_CST)
3562 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3563 maxindex = build_int_2 (TREE_STRING_LENGTH (initial_value) / eltsize - 1, 0);
3565 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3568 = list_length (CONSTRUCTOR_ELTS (initial_value));
3569 maxindex = build_int_2 (nelts - 1, 0);
3573 /* Make an error message unless that happened already. */
3574 if (initial_value != error_mark_node)
3577 /* Prevent further error messages. */
3578 maxindex = build_int_2 (1, 0);
3585 maxindex = build_int_2 (1, 0);
3591 TYPE_DOMAIN (type) = build_index_type (maxindex);
3592 if (!TREE_TYPE (maxindex))
3593 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3596 /* Lay out the type now that we can get the real answer. */
3603 /* Given declspecs and a declarator,
3604 determine the name and type of the object declared
3605 and construct a ..._DECL node for it.
3606 (In one case we can return a ..._TYPE node instead.
3607 For invalid input we sometimes return 0.)
3609 DECLSPECS is a chain of tree_list nodes whose value fields
3610 are the storage classes and type specifiers.
3612 DECL_CONTEXT says which syntactic context this declaration is in:
3613 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3614 FUNCDEF for a function definition. Like NORMAL but a few different
3615 error messages in each case. Return value may be zero meaning
3616 this definition is too screwy to try to parse.
3617 PARM for a parameter declaration (either within a function prototype
3618 or before a function body). Make a PARM_DECL, or return void_type_node.
3619 TYPENAME if for a typename (in a cast or sizeof).
3620 Don't make a DECL node; just return the ..._TYPE node.
3621 FIELD for a struct or union field; make a FIELD_DECL.
3622 BITFIELD for a field with specified width.
3623 INITIALIZED is 1 if the decl has an initializer.
3625 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3626 It may also be so in the PARM case, for a prototype where the
3627 argument type is specified but not the name.
3629 This function is where the complicated C meanings of `static'
3630 and `extern' are interpreted. */
3633 grokdeclarator (declarator, declspecs, decl_context, initialized)
3636 enum decl_context decl_context;
3641 tree type = NULL_TREE;
3646 int explicit_int = 0;
3647 int explicit_char = 0;
3648 int defaulted_int = 0;
3649 tree typedef_decl = 0;
3651 tree typedef_type = 0;
3652 int funcdef_flag = 0;
3653 enum tree_code innermost_code = ERROR_MARK;
3655 int size_varies = 0;
3657 if (decl_context == BITFIELD)
3658 bitfield = 1, decl_context = FIELD;
3660 if (decl_context == FUNCDEF)
3661 funcdef_flag = 1, decl_context = NORMAL;
3663 push_obstacks_nochange ();
3665 if (flag_traditional && allocation_temporary_p ())
3666 end_temporary_allocation ();
3668 /* Look inside a declarator for the name being declared
3669 and get it as a string, for an error message. */
3671 register tree decl = declarator;
3675 switch (TREE_CODE (decl))
3680 innermost_code = TREE_CODE (decl);
3681 decl = TREE_OPERAND (decl, 0);
3684 case IDENTIFIER_NODE:
3685 name = IDENTIFIER_POINTER (decl);
3696 /* A function definition's declarator must have the form of
3697 a function declarator. */
3699 if (funcdef_flag && innermost_code != CALL_EXPR)
3702 /* Anything declared one level down from the top level
3703 must be one of the parameters of a function
3704 (because the body is at least two levels down). */
3706 /* If this looks like a function definition, make it one,
3707 even if it occurs where parms are expected.
3708 Then store_parm_decls will reject it and not use it as a parm. */
3709 if (decl_context == NORMAL && !funcdef_flag
3710 && current_binding_level->level_chain == global_binding_level)
3711 decl_context = PARM;
3713 /* Look through the decl specs and record which ones appear.
3714 Some typespecs are defined as built-in typenames.
3715 Others, the ones that are modifiers of other types,
3716 are represented by bits in SPECBITS: set the bits for
3717 the modifiers that appear. Storage class keywords are also in SPECBITS.
3719 If there is a typedef name or a type, store the type in TYPE.
3720 This includes builtin typedefs such as `int'.
3722 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3723 and did not come from a user typedef.
3725 Set LONGLONG if `long' is mentioned twice. */
3727 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3730 register tree id = TREE_VALUE (spec);
3732 if (id == ridpointers[(int) RID_INT])
3734 if (id == ridpointers[(int) RID_CHAR])
3737 if (TREE_CODE (id) == IDENTIFIER_NODE)
3738 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3740 if (ridpointers[i] == id)
3742 if (i == (int) RID_LONG && specbits & (1<<i))
3745 error ("`long long long' is too long for GCC");
3749 pedwarn ("ANSI C does not support `long long'");
3753 else if (specbits & (1 << i))
3754 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3760 error ("two or more data types in declaration of `%s'", name);
3761 /* Actual typedefs come to us as TYPE_DECL nodes. */
3762 else if (TREE_CODE (id) == TYPE_DECL)
3764 type = TREE_TYPE (id);
3767 /* Built-in types come as identifiers. */
3768 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3770 register tree t = lookup_name (id);
3771 if (TREE_TYPE (t) == error_mark_node)
3773 else if (!t || TREE_CODE (t) != TYPE_DECL)
3774 error ("`%s' fails to be a typedef or built in type",
3775 IDENTIFIER_POINTER (id));
3778 type = TREE_TYPE (t);
3782 else if (TREE_CODE (id) != ERROR_MARK)
3788 typedef_type = type;
3790 size_varies = C_TYPE_VARIABLE_SIZE (type);
3792 /* No type at all: default to `int', and set DEFAULTED_INT
3793 because it was not a user-defined typedef. */
3797 if (funcdef_flag && warn_return_type
3798 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3799 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3800 warn_about_return_type = 1;
3802 type = integer_type_node;
3805 /* Now process the modifiers that were specified
3806 and check for invalid combinations. */
3808 /* Long double is a special combination. */
3810 if ((specbits & 1 << (int) RID_LONG)
3811 && TYPE_MAIN_VARIANT (type) == double_type_node)
3813 specbits &= ~ (1 << (int) RID_LONG);
3814 type = long_double_type_node;
3817 /* Check all other uses of type modifiers. */
3819 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3820 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
3824 if (TREE_CODE (type) != INTEGER_TYPE)
3825 error ("long, short, signed or unsigned invalid for `%s'", name);
3826 else if ((specbits & 1 << (int) RID_LONG)
3827 && (specbits & 1 << (int) RID_SHORT))
3828 error ("long and short specified together for `%s'", name);
3829 else if (((specbits & 1 << (int) RID_LONG)
3830 || (specbits & 1 << (int) RID_SHORT))
3832 error ("long or short specified with char for `%s'", name);
3833 else if (((specbits & 1 << (int) RID_LONG)
3834 || (specbits & 1 << (int) RID_SHORT))
3835 && TREE_CODE (type) == REAL_TYPE)
3836 error ("long or short specified with floating type for `%s'", name);
3837 else if ((specbits & 1 << (int) RID_SIGNED)
3838 && (specbits & 1 << (int) RID_UNSIGNED))
3839 error ("signed and unsigned given together for `%s'", name);
3843 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
3845 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
3847 if (flag_pedantic_errors)
3852 /* Discard the type modifiers if they are invalid. */
3855 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3856 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
3861 /* Decide whether an integer type is signed or not.
3862 Optionally treat bitfields as signed by default. */
3863 if (specbits & 1 << (int) RID_UNSIGNED
3864 /* Traditionally, all bitfields are unsigned. */
3865 || (bitfield && flag_traditional
3866 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
3867 || (bitfield && ! flag_signed_bitfields
3868 && (explicit_int || defaulted_int || explicit_char
3869 /* A typedef for plain `int' without `signed'
3870 can be controlled just like plain `int'. */
3871 || ! (typedef_decl != 0
3872 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
3873 && TREE_CODE (type) != ENUMERAL_TYPE
3874 && !(specbits & 1 << (int) RID_SIGNED)))
3877 type = long_long_unsigned_type_node;
3878 else if (specbits & 1 << (int) RID_LONG)
3879 type = long_unsigned_type_node;
3880 else if (specbits & 1 << (int) RID_SHORT)
3881 type = short_unsigned_type_node;
3882 else if (type == char_type_node)
3883 type = unsigned_char_type_node;
3884 else if (typedef_decl)
3885 type = unsigned_type (type);
3887 type = unsigned_type_node;
3889 else if ((specbits & 1 << (int) RID_SIGNED)
3890 && type == char_type_node)
3891 type = signed_char_type_node;
3893 type = long_long_integer_type_node;
3894 else if (specbits & 1 << (int) RID_LONG)
3895 type = long_integer_type_node;
3896 else if (specbits & 1 << (int) RID_SHORT)
3897 type = short_integer_type_node;
3898 else if (specbits & 1 << (int) RID_COMPLEX)
3901 type = complex_double_type_node;
3902 else if (type == integer_type_node)
3903 type = complex_integer_type_node;
3904 else if (type == float_type_node)
3905 type = complex_float_type_node;
3906 else if (type == double_type_node)
3907 type = complex_double_type_node;
3908 else if (type == long_double_type_node)
3909 type = complex_long_double_type_node;
3911 error ("invalid complex type");
3914 /* Set CONSTP if this declaration is `const', whether by
3915 explicit specification or via a typedef.
3916 Likewise for VOLATILEP. */
3918 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
3919 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
3920 inlinep = !! (specbits & (1 << (int) RID_INLINE));
3922 pedwarn ("duplicate `const'");
3924 pedwarn ("duplicate `volatile'");
3925 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
3926 type = TYPE_MAIN_VARIANT (type);
3928 /* Warn if two storage classes are given. Default to `auto'. */
3933 if (specbits & 1 << (int) RID_AUTO) nclasses++;
3934 if (specbits & 1 << (int) RID_STATIC) nclasses++;
3935 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
3936 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
3937 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
3938 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
3940 /* Warn about storage classes that are invalid for certain
3941 kinds of declarations (parameters, typenames, etc.). */
3944 error ("multiple storage classes in declaration of `%s'", name);
3945 else if (funcdef_flag
3947 & ((1 << (int) RID_REGISTER)
3948 | (1 << (int) RID_AUTO)
3949 | (1 << (int) RID_TYPEDEF))))
3951 if (specbits & 1 << (int) RID_AUTO
3952 && (pedantic || current_binding_level == global_binding_level))
3953 pedwarn ("function definition declared `auto'");
3954 if (specbits & 1 << (int) RID_REGISTER)
3955 error ("function definition declared `register'");
3956 if (specbits & 1 << (int) RID_TYPEDEF)
3957 error ("function definition declared `typedef'");
3958 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3959 | (1 << (int) RID_AUTO));
3961 else if (decl_context != NORMAL && nclasses > 0)
3963 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
3967 error ((decl_context == FIELD
3968 ? "storage class specified for structure field `%s'"
3969 : (decl_context == PARM
3970 ? "storage class specified for parameter `%s'"
3971 : "storage class specified for typename")),
3973 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
3974 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
3975 | (1 << (int) RID_EXTERN));
3978 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
3980 /* `extern' with initialization is invalid if not at top level. */
3981 if (current_binding_level == global_binding_level)
3982 warning ("`%s' initialized and declared `extern'", name);
3984 error ("`%s' has both `extern' and initializer", name);
3986 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
3987 && current_binding_level != global_binding_level)
3988 error ("nested function `%s' declared `extern'", name);
3989 else if (current_binding_level == global_binding_level
3990 && specbits & (1 << (int) RID_AUTO))
3991 error ("top-level declaration of `%s' specifies `auto'", name);
3992 else if ((specbits & 1 << (int) RID_ITERATOR)
3993 && TREE_CODE (declarator) != IDENTIFIER_NODE)
3995 error ("iterator `%s' has derived type", name);
3996 type = error_mark_node;
3998 else if ((specbits & 1 << (int) RID_ITERATOR)
3999 && TREE_CODE (type) != INTEGER_TYPE)
4001 error ("iterator `%s' has noninteger type", name);
4002 type = error_mark_node;
4006 /* Now figure out the structure of the declarator proper.
4007 Descend through it, creating more complex types, until we reach
4008 the declared identifier (or NULL_TREE, in an absolute declarator). */
4010 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4012 if (type == error_mark_node)
4014 declarator = TREE_OPERAND (declarator, 0);
4018 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4019 an INDIRECT_REF (for *...),
4020 a CALL_EXPR (for ...(...)),
4021 an identifier (for the name being declared)
4022 or a null pointer (for the place in an absolute declarator
4023 where the name was omitted).
4024 For the last two cases, we have just exited the loop.
4026 At this point, TYPE is the type of elements of an array,
4027 or for a function to return, or for a pointer to point to.
4028 After this sequence of ifs, TYPE is the type of the
4029 array or function or pointer, and DECLARATOR has had its
4030 outermost layer removed. */
4032 if (TREE_CODE (declarator) == ARRAY_REF)
4034 register tree itype = NULL_TREE;
4035 register tree size = TREE_OPERAND (declarator, 1);
4037 declarator = TREE_OPERAND (declarator, 0);
4039 /* Check for some types that there cannot be arrays of. */
4041 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4043 error ("declaration of `%s' as array of voids", name);
4044 type = error_mark_node;
4047 if (TREE_CODE (type) == FUNCTION_TYPE)
4049 error ("declaration of `%s' as array of functions", name);
4050 type = error_mark_node;
4053 if (size == error_mark_node)
4054 type = error_mark_node;
4056 if (type == error_mark_node)
4059 /* If size was specified, set ITYPE to a range-type for that size.
4060 Otherwise, ITYPE remains null. finish_decl may figure it out
4061 from an initial value. */
4065 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4066 STRIP_TYPE_NOPS (size);
4068 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4069 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4071 error ("size of array `%s' has non-integer type", name);
4072 size = integer_one_node;
4074 if (pedantic && integer_zerop (size))
4075 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4076 if (TREE_CODE (size) == INTEGER_CST)
4078 constant_expression_warning (size);
4079 if (INT_CST_LT (size, integer_zero_node))
4081 error ("size of array `%s' is negative", name);
4082 size = integer_one_node;
4084 itype = build_index_type (size_binop (MINUS_EXPR, size,
4090 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4091 itype = build_binary_op (MINUS_EXPR, size, integer_one_node,
4093 /* Make sure the array size remains visibly nonconstant
4094 even if it is (eg) a const variable with known value. */
4096 itype = variable_size (itype);
4097 itype = build_index_type (itype);
4101 #if 0 /* This had bad results for pointers to arrays, as in
4102 union incomplete (*foo)[4]; */
4103 /* Complain about arrays of incomplete types, except in typedefs. */
4105 if (TYPE_SIZE (type) == 0
4106 /* Avoid multiple warnings for nested array types. */
4107 && TREE_CODE (type) != ARRAY_TYPE
4108 && !(specbits & (1 << (int) RID_TYPEDEF))
4109 && !C_TYPE_BEING_DEFINED (type))
4110 warning ("array type has incomplete element type");
4113 /* Build the array type itself.
4114 Merge any constancy or volatility into the target type. */
4116 #if 0 /* We shouldn't have a function type here at all!
4117 Functions aren't allowed as array elements. */
4118 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4119 && (constp || volatilep))
4120 pedwarn ("ANSI C forbids const or volatile function types");
4122 if (constp || volatilep)
4123 type = c_build_type_variant (type, constp, volatilep);
4125 #if 0 /* don't clear these; leave them set so that the array type
4126 or the variable is itself const or volatile. */
4131 type = build_array_type (type, itype);
4133 C_TYPE_VARIABLE_SIZE (type) = 1;
4135 else if (TREE_CODE (declarator) == CALL_EXPR)
4137 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4138 || current_binding_level == global_binding_level);
4141 /* Declaring a function type.
4142 Make sure we have a valid type for the function to return. */
4143 if (type == error_mark_node)
4148 /* Warn about some types functions can't return. */
4150 if (TREE_CODE (type) == FUNCTION_TYPE)
4152 error ("`%s' declared as function returning a function", name);
4153 type = integer_type_node;
4155 if (TREE_CODE (type) == ARRAY_TYPE)
4157 error ("`%s' declared as function returning an array", name);
4158 type = integer_type_node;
4161 #ifndef TRADITIONAL_RETURN_FLOAT
4162 /* Traditionally, declaring return type float means double. */
4164 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4165 type = double_type_node;
4166 #endif /* TRADITIONAL_RETURN_FLOAT */
4168 /* If this is a block level extern, it must live past the end
4169 of the function so that we can check it against other extern
4170 declarations (IDENTIFIER_LIMBO_VALUE). */
4171 if (extern_ref && allocation_temporary_p ())
4172 end_temporary_allocation ();
4174 /* Construct the function type and go to the next
4175 inner layer of declarator. */
4177 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4179 /* Say it's a definition
4180 only for the CALL_EXPR
4181 closest to the identifier. */
4182 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4183 #if 0 /* This seems to be false. We turn off temporary allocation
4184 above in this function if -traditional.
4185 And this code caused inconsistent results with prototypes:
4186 callers would ignore them, and pass arguments wrong. */
4188 /* Omit the arg types if -traditional, since the arg types
4189 and the list links might not be permanent. */
4190 type = build_function_type (type,
4192 ? NULL_TREE : arg_types);
4194 type = build_function_type (type, arg_types);
4195 declarator = TREE_OPERAND (declarator, 0);
4197 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4198 the formal parameter list of this FUNCTION_TYPE to point to
4199 the FUNCTION_TYPE node itself. */
4204 for (link = current_function_parm_tags;
4206 link = TREE_CHAIN (link))
4207 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4210 else if (TREE_CODE (declarator) == INDIRECT_REF)
4212 /* Merge any constancy or volatility into the target type
4215 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4216 && (constp || volatilep))
4217 pedwarn ("ANSI C forbids const or volatile function types");
4218 if (constp || volatilep)
4219 type = c_build_type_variant (type, constp, volatilep);
4224 type = build_pointer_type (type);
4226 /* Process a list of type modifier keywords
4227 (such as const or volatile) that were given inside the `*'. */
4229 if (TREE_TYPE (declarator))
4231 register tree typemodlist;
4233 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4234 typemodlist = TREE_CHAIN (typemodlist))
4236 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4238 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4243 error ("invalid type modifier within pointer declarator");
4247 pedwarn ("duplicate `const'");
4249 pedwarn ("duplicate `volatile'");
4252 declarator = TREE_OPERAND (declarator, 0);
4259 /* Now TYPE has the actual type. */
4261 /* If this is declaring a typedef name, return a TYPE_DECL. */
4263 if (specbits & (1 << (int) RID_TYPEDEF))
4266 /* Note that the grammar rejects storage classes
4267 in typenames, fields or parameters */
4268 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4269 && (constp || volatilep))
4270 pedwarn ("ANSI C forbids const or volatile function types");
4271 if (constp || volatilep)
4272 type = c_build_type_variant (type, constp, volatilep);
4274 decl = build_decl (TYPE_DECL, declarator, type);
4275 if ((specbits & (1 << (int) RID_SIGNED))
4276 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4277 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4281 /* Detect the case of an array type of unspecified size
4282 which came, as such, direct from a typedef name.
4283 We must copy the type, so that each identifier gets
4284 a distinct type, so that each identifier's size can be
4285 controlled separately by its own initializer. */
4287 if (type != 0 && typedef_type != 0
4288 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4289 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4291 type = build_array_type (TREE_TYPE (type), 0);
4293 C_TYPE_VARIABLE_SIZE (type) = 1;
4296 /* If this is a type name (such as, in a cast or sizeof),
4297 compute the type and return it now. */
4299 if (decl_context == TYPENAME)
4301 /* Note that the grammar rejects storage classes
4302 in typenames, fields or parameters */
4303 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4304 && (constp || volatilep))
4305 pedwarn ("ANSI C forbids const or volatile function types");
4306 if (constp || volatilep)
4307 type = c_build_type_variant (type, constp, volatilep);
4312 /* `void' at top level (not within pointer)
4313 is allowed only in typedefs or type names.
4314 We don't complain about parms either, but that is because
4315 a better error message can be made later. */
4317 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM)
4319 error ("variable or field `%s' declared void",
4320 IDENTIFIER_POINTER (declarator));
4321 type = integer_type_node;
4324 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4325 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4330 if (decl_context == PARM)
4332 tree type_as_written = type;
4335 /* A parameter declared as an array of T is really a pointer to T.
4336 One declared as a function is really a pointer to a function. */
4338 if (TREE_CODE (type) == ARRAY_TYPE)
4340 /* Transfer const-ness of array into that of type pointed to. */
4341 type = build_pointer_type
4342 (c_build_type_variant (TREE_TYPE (type), constp, volatilep));
4343 volatilep = constp = 0;
4346 else if (TREE_CODE (type) == FUNCTION_TYPE)
4348 if (pedantic && (constp || volatilep))
4349 pedwarn ("ANSI C forbids const or volatile function types");
4350 type = build_pointer_type (c_build_type_variant (type, constp, volatilep));
4351 volatilep = constp = 0;
4354 decl = build_decl (PARM_DECL, declarator, type);
4356 C_DECL_VARIABLE_SIZE (decl) = 1;
4358 /* Compute the type actually passed in the parmlist,
4359 for the case where there is no prototype.
4360 (For example, shorts and chars are passed as ints.)
4361 When there is a prototype, this is overridden later. */
4363 DECL_ARG_TYPE (decl) = type;
4364 main_type = TYPE_MAIN_VARIANT (type);
4365 if (main_type == float_type_node)
4366 DECL_ARG_TYPE (decl) = double_type_node;
4367 /* Don't use TYPE_PRECISION to decide whether to promote,
4368 because we should convert short if it's the same size as int,
4369 but we should not convert long if it's the same size as int. */
4370 else if (C_PROMOTING_INTEGER_TYPE_P (main_type))
4372 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4373 && TREE_UNSIGNED (type))
4374 DECL_ARG_TYPE (decl) = unsigned_type_node;
4376 DECL_ARG_TYPE (decl) = integer_type_node;
4379 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4381 else if (decl_context == FIELD)
4383 /* Structure field. It may not be a function. */
4385 if (TREE_CODE (type) == FUNCTION_TYPE)
4387 error ("field `%s' declared as a function",
4388 IDENTIFIER_POINTER (declarator));
4389 type = build_pointer_type (type);
4391 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4393 error ("field `%s' has incomplete type",
4394 IDENTIFIER_POINTER (declarator));
4395 type = error_mark_node;
4397 /* Move type qualifiers down to element of an array. */
4398 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4400 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4402 TYPE_DOMAIN (type));
4403 #if 0 /* Leave the field const or volatile as well. */
4404 constp = volatilep = 0;
4407 decl = build_decl (FIELD_DECL, declarator, type);
4409 C_DECL_VARIABLE_SIZE (decl) = 1;
4411 else if (TREE_CODE (type) == FUNCTION_TYPE)
4413 /* Every function declaration is "external"
4414 except for those which are inside a function body
4415 in which `auto' is used.
4416 That is a case not specified by ANSI C,
4417 and we use it for forward declarations for nested functions. */
4418 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4419 || current_binding_level == global_binding_level);
4421 if (specbits & (1 << (int) RID_AUTO)
4422 && (pedantic || current_binding_level == global_binding_level))
4423 pedwarn ("invalid storage class for function `%s'",
4424 IDENTIFIER_POINTER (declarator));
4425 if (specbits & (1 << (int) RID_REGISTER))
4426 error ("invalid storage class for function `%s'",
4427 IDENTIFIER_POINTER (declarator));
4428 /* Function declaration not at top level.
4429 Storage classes other than `extern' are not allowed
4430 and `extern' makes no difference. */
4431 if (current_binding_level != global_binding_level
4432 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4434 pedwarn ("invalid storage class for function `%s'",
4435 IDENTIFIER_POINTER (declarator));
4437 /* If this is a block level extern, it must live past the end
4438 of the function so that we can check it against other
4439 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4440 if (extern_ref && allocation_temporary_p ())
4441 end_temporary_allocation ();
4443 decl = build_decl (FUNCTION_DECL, declarator, type);
4445 if (pedantic && (constp || volatilep)
4446 && ! DECL_IN_SYSTEM_HEADER (decl))
4447 pedwarn ("ANSI C forbids const or volatile functions");
4450 DECL_EXTERNAL (decl) = 1;
4451 /* Record absence of global scope for `static' or `auto'. */
4453 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4454 /* Record presence of `inline', if it is reasonable. */
4457 tree last = tree_last (TYPE_ARG_TYPES (type));
4459 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4460 warning ("cannot inline function `main'");
4461 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4463 warning ("inline declaration ignored for function with `...'");
4465 /* Assume that otherwise the function can be inlined. */
4466 DECL_INLINE (decl) = 1;
4468 if (specbits & (1 << (int) RID_EXTERN))
4469 current_extern_inline = 1;
4474 /* It's a variable. */
4475 /* An uninitialized decl with `extern' is a reference. */
4476 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4478 /* Move type qualifiers down to element of an array. */
4479 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4481 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4483 TYPE_DOMAIN (type));
4484 #if 0 /* Leave the variable const or volatile as well. */
4485 constp = volatilep = 0;
4489 /* If this is a block level extern, it must live past the end
4490 of the function so that we can check it against other
4491 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4492 if (extern_ref && allocation_temporary_p ())
4493 end_temporary_allocation ();
4495 decl = build_decl (VAR_DECL, declarator, type);
4497 C_DECL_VARIABLE_SIZE (decl) = 1;
4500 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4502 DECL_EXTERNAL (decl) = extern_ref;
4503 /* At top level, the presence of a `static' or `register' storage
4504 class specifier, or the absence of all storage class specifiers
4505 makes this declaration a definition (perhaps tentative). Also,
4506 the absence of both `static' and `register' makes it public. */
4507 if (current_binding_level == global_binding_level)
4511 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4512 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4514 /* Not at top level, only `static' makes a static definition. */
4517 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4518 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4521 if (specbits & 1 << (int) RID_ITERATOR)
4522 ITERATOR_P (decl) = 1;
4525 /* Record `register' declaration for warnings on &
4526 and in case doing stupid register allocation. */
4528 if (specbits & (1 << (int) RID_REGISTER))
4529 DECL_REGISTER (decl) = 1;
4531 /* Record constancy and volatility. */
4534 TREE_READONLY (decl) = 1;
4537 TREE_SIDE_EFFECTS (decl) = 1;
4538 TREE_THIS_VOLATILE (decl) = 1;
4540 /* If a type has volatile components, it should be stored in memory.
4541 Otherwise, the fact that those components are volatile
4542 will be ignored, and would even crash the compiler. */
4543 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4544 mark_addressable (decl);
4552 /* Decode the parameter-list info for a function type or function definition.
4553 The argument is the value returned by `get_parm_info' (or made in parse.y
4554 if there is an identifier list instead of a parameter decl list).
4555 These two functions are separate because when a function returns
4556 or receives functions then each is called multiple times but the order
4557 of calls is different. The last call to `grokparms' is always the one
4558 that contains the formal parameter names of a function definition.
4560 Store in `last_function_parms' a chain of the decls of parms.
4561 Also store in `last_function_parm_tags' a chain of the struct, union,
4562 and enum tags declared among the parms.
4564 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4566 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4567 a mere declaration. A nonempty identifier-list gets an error message
4568 when FUNCDEF_FLAG is zero. */
4571 grokparms (parms_info, funcdef_flag)
4575 tree first_parm = TREE_CHAIN (parms_info);
4577 last_function_parms = TREE_PURPOSE (parms_info);
4578 last_function_parm_tags = TREE_VALUE (parms_info);
4580 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4581 && !in_system_header)
4582 warning ("function declaration isn't a prototype");
4585 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4588 pedwarn ("parameter names (without types) in function declaration");
4590 last_function_parms = first_parm;
4597 /* We no longer test FUNCDEF_FLAG.
4598 If the arg types are incomplete in a declaration,
4599 they must include undefined tags.
4600 These tags can never be defined in the scope of the declaration,
4601 so the types can never be completed,
4602 and no call can be compiled successfully. */
4604 /* In a fcn definition, arg types must be complete. */
4607 for (parm = last_function_parms, typelt = first_parm;
4609 parm = TREE_CHAIN (parm))
4610 /* Skip over any enumeration constants declared here. */
4611 if (TREE_CODE (parm) == PARM_DECL)
4613 /* Barf if the parameter itself has an incomplete type. */
4614 tree type = TREE_VALUE (typelt);
4615 if (TYPE_SIZE (type) == 0)
4617 if (funcdef_flag && DECL_NAME (parm) != 0)
4618 error ("parameter `%s' has incomplete type",
4619 IDENTIFIER_POINTER (DECL_NAME (parm)));
4621 warning ("parameter has incomplete type");
4624 TREE_VALUE (typelt) = error_mark_node;
4625 TREE_TYPE (parm) = error_mark_node;
4628 #if 0 /* This has been replaced by parm_tags_warning
4629 which uses a more accurate criterion for what to warn about. */
4632 /* Now warn if is a pointer to an incomplete type. */
4633 while (TREE_CODE (type) == POINTER_TYPE
4634 || TREE_CODE (type) == REFERENCE_TYPE)
4635 type = TREE_TYPE (type);
4636 type = TYPE_MAIN_VARIANT (type);
4637 if (TYPE_SIZE (type) == 0)
4639 if (DECL_NAME (parm) != 0)
4640 warning ("parameter `%s' points to incomplete type",
4641 IDENTIFIER_POINTER (DECL_NAME (parm)));
4643 warning ("parameter points to incomplete type");
4647 typelt = TREE_CHAIN (typelt);
4650 /* Allocate the list of types the way we allocate a type. */
4651 if (first_parm && ! TREE_PERMANENT (first_parm))
4653 /* Construct a copy of the list of types
4654 on the saveable obstack. */
4656 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4657 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4659 return nreverse (result);
4662 /* The list we have is permanent already. */
4668 /* Return a tree_list node with info on a parameter list just parsed.
4669 The TREE_PURPOSE is a chain of decls of those parms.
4670 The TREE_VALUE is a list of structure, union and enum tags defined.
4671 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4672 This tree_list node is later fed to `grokparms'.
4674 VOID_AT_END nonzero means append `void' to the end of the type-list.
4675 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4678 get_parm_info (void_at_end)
4681 register tree decl, t;
4682 register tree types = 0;
4684 tree tags = gettags ();
4685 tree parms = getdecls ();
4687 tree order = current_binding_level->parm_order;
4689 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4690 if (void_at_end && parms != 0
4691 && TREE_CHAIN (parms) == 0
4692 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4693 && DECL_NAME (parms) == 0)
4696 storedecls (NULL_TREE);
4697 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4698 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4701 /* Extract enumerator values and other non-parms declared with the parms.
4702 Likewise any forward parm decls that didn't have real parm decls. */
4703 for (decl = parms; decl; )
4705 tree next = TREE_CHAIN (decl);
4707 if (TREE_CODE (decl) != PARM_DECL)
4709 TREE_CHAIN (decl) = new_parms;
4712 else if (TREE_ASM_WRITTEN (decl))
4714 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4715 TREE_CHAIN (decl) = new_parms;
4721 /* Put the parm decls back in the order they were in in the parm list. */
4722 for (t = order; t; t = TREE_CHAIN (t))
4725 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4727 TREE_CHAIN (TREE_VALUE (t)) = 0;
4730 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4733 /* Store the parmlist in the binding level since the old one
4734 is no longer a valid list. (We have changed the chain pointers.) */
4735 storedecls (new_parms);
4737 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4738 /* There may also be declarations for enumerators if an enumeration
4739 type is declared among the parms. Ignore them here. */
4740 if (TREE_CODE (decl) == PARM_DECL)
4742 /* Since there is a prototype,
4743 args are passed in their declared types. */
4744 tree type = TREE_TYPE (decl);
4745 DECL_ARG_TYPE (decl) = type;
4746 #ifdef PROMOTE_PROTOTYPES
4747 if (TREE_CODE (type) == INTEGER_TYPE
4748 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4749 DECL_ARG_TYPE (decl) = integer_type_node;
4752 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4753 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
4754 && DECL_NAME (decl) == 0)
4756 error ("`void' in parameter list must be the entire list");
4762 return saveable_tree_cons (new_parms, tags,
4763 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
4765 return saveable_tree_cons (new_parms, tags, nreverse (types));
4768 /* At end of parameter list, warn about any struct, union or enum tags
4769 defined within. Do so because these types cannot ever become complete. */
4772 parmlist_tags_warning ()
4777 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
4779 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
4780 /* An anonymous union parm type is meaningful as a GNU extension.
4781 So don't warn for that. */
4782 if (code == UNION_TYPE && !pedantic)
4784 if (TREE_PURPOSE (elt) != 0)
4785 warning ("`%s %s' declared inside parameter list",
4786 (code == RECORD_TYPE ? "struct"
4787 : code == UNION_TYPE ? "union"
4789 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
4791 warning ("anonymous %s declared inside parameter list",
4792 (code == RECORD_TYPE ? "struct"
4793 : code == UNION_TYPE ? "union"
4798 warning ("its scope is only this definition or declaration,");
4799 warning ("which is probably not what you want.");
4805 /* Get the struct, enum or union (CODE says which) with tag NAME.
4806 Define the tag as a forward-reference if it is not defined. */
4809 xref_tag (code, name)
4810 enum tree_code code;
4813 int temporary = allocation_temporary_p ();
4815 /* If a cross reference is requested, look up the type
4816 already defined for this tag and return it. */
4818 register tree ref = lookup_tag (code, name, current_binding_level, 0);
4819 /* Even if this is the wrong type of tag, return what we found.
4820 There will be an error message anyway, from pending_xref_error.
4821 If we create an empty xref just for an invalid use of the type,
4822 the main result is to create lots of superfluous error messages. */
4826 push_obstacks_nochange ();
4828 if (current_binding_level == global_binding_level && temporary)
4829 end_temporary_allocation ();
4831 /* If no such tag is yet defined, create a forward-reference node
4832 and record it as the "definition".
4833 When a real declaration of this type is found,
4834 the forward-reference will be altered into a real type. */
4836 ref = make_node (code);
4837 if (code == ENUMERAL_TYPE)
4839 /* (In ANSI, Enums can be referred to only if already defined.) */
4841 pedwarn ("ANSI C forbids forward references to `enum' types");
4842 /* Give the type a default layout like unsigned int
4843 to avoid crashing if it does not get defined. */
4844 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
4845 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
4846 TREE_UNSIGNED (ref) = 1;
4847 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
4848 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
4849 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
4852 pushtag (name, ref);
4859 /* Make sure that the tag NAME is defined *in the current binding level*
4860 at least as a forward reference.
4861 CODE says which kind of tag NAME ought to be.
4863 We also do a push_obstacks_nochange
4864 whose matching pop is in finish_struct. */
4867 start_struct (code, name)
4868 enum tree_code code;
4871 /* If there is already a tag defined at this binding level
4872 (as a forward reference), just return it. */
4874 register tree ref = 0;
4876 push_obstacks_nochange ();
4877 if (current_binding_level == global_binding_level)
4878 end_temporary_allocation ();
4881 ref = lookup_tag (code, name, current_binding_level, 1);
4882 if (ref && TREE_CODE (ref) == code)
4884 C_TYPE_BEING_DEFINED (ref) = 1;
4885 if (TYPE_FIELDS (ref))
4886 error ((code == UNION_TYPE ? "redefinition of `union %s'"
4887 : "redefinition of `struct %s'"),
4888 IDENTIFIER_POINTER (name));
4893 /* Otherwise create a forward-reference just so the tag is in scope. */
4895 ref = make_node (code);
4896 pushtag (name, ref);
4897 C_TYPE_BEING_DEFINED (ref) = 1;
4901 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4902 of a structure component, returning a FIELD_DECL node.
4903 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4905 This is done during the parsing of the struct declaration.
4906 The FIELD_DECL nodes are chained together and the lot of them
4907 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4910 grokfield (filename, line, declarator, declspecs, width)
4913 tree declarator, declspecs, width;
4917 /* The corresponding pop_obstacks is in finish_decl. */
4918 push_obstacks_nochange ();
4920 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
4922 finish_decl (value, NULL_TREE, NULL_TREE);
4923 DECL_INITIAL (value) = width;
4928 /* Function to help qsort sort FIELD_DECLs by name order. */
4931 field_decl_cmp (x, y)
4934 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
4937 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4938 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4940 We also do a pop_obstacks to match the push in start_struct. */
4943 finish_struct (t, fieldlist)
4944 register tree t, fieldlist;
4948 int toplevel = global_binding_level == current_binding_level;
4950 /* If this type was previously laid out as a forward reference,
4951 make sure we lay it out again. */
4955 /* Nameless union parm types are useful as GCC extension. */
4956 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
4957 /* Otherwise, warn about any struct or union def. in parmlist. */
4958 if (in_parm_level_p ())
4961 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4962 : "structure defined inside parms"));
4963 else if (! flag_traditional)
4964 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
4965 : "structure defined inside parms"));
4968 old_momentary = suspend_momentary ();
4970 if (fieldlist == 0 && pedantic)
4971 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
4972 : "structure has no members"));
4974 /* Install struct as DECL_CONTEXT of each field decl.
4975 Also process specified field sizes.
4976 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
4977 The specified size is found in the DECL_INITIAL.
4978 Store 0 there, except for ": 0" fields (so we can find them
4979 and delete them, below). */
4981 for (x = fieldlist; x; x = TREE_CHAIN (x))
4983 DECL_CONTEXT (x) = t;
4984 DECL_FIELD_SIZE (x) = 0;
4986 /* If any field is const, the structure type is pseudo-const. */
4987 if (TREE_READONLY (x))
4988 C_TYPE_FIELDS_READONLY (t) = 1;
4991 /* A field that is pseudo-const makes the structure likewise. */
4992 tree t1 = TREE_TYPE (x);
4993 while (TREE_CODE (t1) == ARRAY_TYPE)
4994 t1 = TREE_TYPE (t1);
4995 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
4996 && C_TYPE_FIELDS_READONLY (t1))
4997 C_TYPE_FIELDS_READONLY (t) = 1;
5000 /* Any field that is volatile means variables of this type must be
5001 treated in some ways as volatile. */
5002 if (TREE_THIS_VOLATILE (x))
5003 C_TYPE_FIELDS_VOLATILE (t) = 1;
5005 /* Any field of nominal variable size implies structure is too. */
5006 if (C_DECL_VARIABLE_SIZE (x))
5007 C_TYPE_VARIABLE_SIZE (t) = 1;
5009 /* Detect invalid nested redefinition. */
5010 if (TREE_TYPE (x) == t)
5011 error ("nested redefinition of `%s'",
5012 IDENTIFIER_POINTER (TYPE_NAME (t)));
5014 /* Detect invalid bit-field size. */
5015 if (DECL_INITIAL (x))
5016 STRIP_NOPS (DECL_INITIAL (x));
5017 if (DECL_INITIAL (x))
5019 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5020 constant_expression_warning (DECL_INITIAL (x));
5023 error_with_decl (x, "bit-field `%s' width not an integer constant");
5024 DECL_INITIAL (x) = NULL;
5028 /* Detect invalid bit-field type. */
5029 if (DECL_INITIAL (x)
5030 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5031 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5033 error_with_decl (x, "bit-field `%s' has invalid type");
5034 DECL_INITIAL (x) = NULL;
5036 if (DECL_INITIAL (x) && pedantic
5037 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5038 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node)
5039 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5041 /* Detect and ignore out of range field width. */
5042 if (DECL_INITIAL (x))
5044 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5046 if (tree_int_cst_lt (DECL_INITIAL (x), integer_zero_node))
5048 DECL_INITIAL (x) = NULL;
5049 error_with_decl (x, "negative width in bit-field `%s'");
5051 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5052 || width > TYPE_PRECISION (TREE_TYPE (x)))
5054 DECL_INITIAL (x) = NULL;
5055 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5057 else if (width == 0 && DECL_NAME (x) != 0)
5059 error_with_decl (x, "zero width for bit-field `%s'");
5060 DECL_INITIAL (x) = NULL;
5064 /* Process valid field width. */
5065 if (DECL_INITIAL (x))
5067 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5069 DECL_FIELD_SIZE (x) = width;
5070 DECL_BIT_FIELD (x) = 1;
5071 DECL_INITIAL (x) = NULL;
5075 /* field size 0 => force desired amount of alignment. */
5076 #ifdef EMPTY_FIELD_BOUNDARY
5077 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5079 #ifdef PCC_BITFIELD_TYPE_MATTERS
5080 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5081 TYPE_ALIGN (TREE_TYPE (x)));
5087 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5088 : TYPE_ALIGN (TREE_TYPE (x)));
5089 /* Non-bit-fields are aligned for their type, except packed
5090 fields which require only BITS_PER_UNIT alignment. */
5091 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5095 /* Now DECL_INITIAL is null on all members. */
5097 /* Delete all duplicate fields from the fieldlist */
5098 for (x = fieldlist; x && TREE_CHAIN (x);)
5099 /* Anonymous fields aren't duplicates. */
5100 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5104 register tree y = fieldlist;
5108 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5114 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5116 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5117 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5119 else x = TREE_CHAIN (x);
5122 /* Now we have the nearly final fieldlist. Record it,
5123 then lay out the structure or union (including the fields). */
5125 TYPE_FIELDS (t) = fieldlist;
5129 /* Delete all zero-width bit-fields from the front of the fieldlist */
5131 && DECL_INITIAL (fieldlist))
5132 fieldlist = TREE_CHAIN (fieldlist);
5133 /* Delete all such members from the rest of the fieldlist */
5134 for (x = fieldlist; x;)
5136 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5137 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5138 else x = TREE_CHAIN (x);
5141 /* Now we have the truly final field list.
5142 Store it in this type and in the variants. */
5144 TYPE_FIELDS (t) = fieldlist;
5146 /* If there are lots of fields, sort so we can look through them fast.
5147 We arbitrarily consider 16 or more elts to be "a lot". */
5151 for (x = fieldlist; x; x = TREE_CHAIN (x))
5162 len += list_length (x);
5163 /* Use the same allocation policy here that make_node uses, to
5164 ensure that this lives as long as the rest of the struct decl.
5165 All decls in an inline function need to be saved. */
5166 if (allocation_temporary_p ())
5167 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5169 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5171 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5172 TYPE_LANG_SPECIFIC (t)->len = len;
5174 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5176 for (x = fieldlist; x; x = TREE_CHAIN (x))
5177 field_array[len++] = x;
5179 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5183 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5185 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5186 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5187 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5190 /* Promote each bit-field's type to int if it is narrower than that. */
5191 for (x = fieldlist; x; x = TREE_CHAIN (x))
5192 if (DECL_BIT_FIELD (x)
5193 && C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x)))
5195 tree type = TREE_TYPE (x);
5197 /* Preserve unsignedness if traditional or if not really any wider. */
5198 if (TREE_UNSIGNED (type)
5199 && (flag_traditional
5200 || (TYPE_PRECISION (type)
5201 == TYPE_PRECISION (integer_type_node))))
5202 TREE_TYPE (x) = unsigned_type_node;
5204 TREE_TYPE (x) = integer_type_node;
5207 /* If this structure or union completes the type of any previous
5208 variable declaration, lay it out and output its rtl. */
5210 if (current_binding_level->n_incomplete != 0)
5213 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5215 if (TREE_TYPE (decl) == t
5216 && TREE_CODE (decl) != TYPE_DECL)
5218 layout_decl (decl, 0);
5219 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5220 maybe_objc_check_decl (decl);
5221 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5224 --current_binding_level->n_incomplete;
5226 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5227 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5229 tree element = TREE_TYPE (decl);
5230 while (TREE_CODE (element) == ARRAY_TYPE)
5231 element = TREE_TYPE (element);
5233 layout_array_type (TREE_TYPE (decl));
5238 resume_momentary (old_momentary);
5240 /* Finish debugging output for this type. */
5241 rest_of_type_compilation (t, toplevel);
5243 /* The matching push is in start_struct. */
5249 /* Lay out the type T, and its element type, and so on. */
5252 layout_array_type (t)
5255 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5256 layout_array_type (TREE_TYPE (t));
5260 /* Begin compiling the definition of an enumeration type.
5261 NAME is its name (or null if anonymous).
5262 Returns the type object, as yet incomplete.
5263 Also records info about it so that build_enumerator
5264 may be used to declare the individual values as they are read. */
5270 register tree enumtype = 0;
5272 /* If this is the real definition for a previous forward reference,
5273 fill in the contents in the same object that used to be the
5274 forward reference. */
5277 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5279 /* The corresponding pop_obstacks is in finish_enum. */
5280 push_obstacks_nochange ();
5281 /* If these symbols and types are global, make them permanent. */
5282 if (current_binding_level == global_binding_level)
5283 end_temporary_allocation ();
5285 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5287 enumtype = make_node (ENUMERAL_TYPE);
5288 pushtag (name, enumtype);
5291 C_TYPE_BEING_DEFINED (enumtype) = 1;
5293 if (TYPE_VALUES (enumtype) != 0)
5295 /* This enum is a named one that has been declared already. */
5296 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5298 /* Completely replace its old definition.
5299 The old enumerators remain defined, however. */
5300 TYPE_VALUES (enumtype) = 0;
5303 enum_next_value = integer_zero_node;
5309 /* After processing and defining all the values of an enumeration type,
5310 install their decls in the enumeration type and finish it off.
5311 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5312 Returns ENUMTYPE. */
5315 finish_enum (enumtype, values)
5316 register tree enumtype, values;
5319 tree minnode = 0, maxnode = 0;
5320 register HOST_WIDE_INT maxvalue = 0;
5321 register HOST_WIDE_INT minvalue = 0;
5323 unsigned precision = 0;
5324 int toplevel = global_binding_level == current_binding_level;
5325 int temporary = allocation_temporary_p ();
5327 if (in_parm_level_p ())
5328 warning ("enum defined inside parms");
5330 /* Calculate the maximum value of any enumerator in this type. */
5332 for (pair = values; pair; pair = TREE_CHAIN (pair))
5334 tree value = TREE_VALUE (pair);
5336 minnode = maxnode = TREE_VALUE (pair);
5339 if (tree_int_cst_lt (maxnode, value))
5341 if (tree_int_cst_lt (value, minnode))
5346 TYPE_MIN_VALUE (enumtype) = minnode;
5347 TYPE_MAX_VALUE (enumtype) = maxnode;
5349 /* Determine the precision this type needs. */
5351 if (TREE_INT_CST_HIGH (minnode) >= 0
5352 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5353 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5354 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5355 precision = TYPE_PRECISION (long_long_integer_type_node);
5358 maxvalue = TREE_INT_CST_LOW (maxnode);
5359 minvalue = TREE_INT_CST_LOW (minnode);
5362 precision = floor_log2 (maxvalue) + 1;
5365 /* Compute number of bits to represent magnitude of a negative value.
5366 Add one to MINVALUE since range of negative numbers
5367 includes the power of two. */
5368 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5369 if (negprecision > precision)
5370 precision = negprecision;
5371 precision += 1; /* room for sign bit */
5378 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5379 /* Use the width of the narrowest normal C type which is wide enough. */
5380 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5382 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5384 TYPE_SIZE (enumtype) = 0;
5385 layout_type (enumtype);
5387 /* An enum can have some negative values; then it is signed. */
5388 TREE_UNSIGNED (enumtype) = ! tree_int_cst_lt (minnode, integer_zero_node);
5390 /* If the enumerators might not fit in an int, change their type now. */
5391 /* It seems more useful in the debugger to leave these as int
5392 unless the enumerator is wider than int. */
5393 if (TYPE_PRECISION (enumtype) <= TYPE_PRECISION (integer_type_node))
5394 for (pair = values; pair; pair = TREE_CHAIN (pair))
5396 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5397 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5398 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5399 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5402 /* Replace the decl nodes in VALUES with their names. */
5403 for (pair = values; pair; pair = TREE_CHAIN (pair))
5404 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5406 TYPE_VALUES (enumtype) = values;
5408 /* Finish debugging output for this type. */
5409 rest_of_type_compilation (enumtype, toplevel);
5411 /* This matches a push in start_enum. */
5417 /* Build and install a CONST_DECL for one value of the
5418 current enumeration type (one that was begun with start_enum).
5419 Return a tree-list containing the CONST_DECL and its value.
5420 Assignment of sequential values by default is handled here. */
5423 build_enumerator (name, value)
5428 /* Validate and default VALUE. */
5430 /* Remove no-op casts from the value. */
5432 STRIP_TYPE_NOPS (value);
5436 if (TREE_CODE (value) == INTEGER_CST)
5437 constant_expression_warning (value);
5440 error ("enumerator value for `%s' not integer constant",
5441 IDENTIFIER_POINTER (name));
5446 /* Default based on previous value. */
5447 /* It should no longer be possible to have NON_LVALUE_EXPR
5451 value = enum_next_value;
5453 error ("overflow in enumeration values");
5456 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5458 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5459 value = integer_zero_node;
5462 /* Set basis for default for next value. */
5463 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5464 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5466 /* Now create a declaration for the enum value name. */
5468 decl = build_decl (CONST_DECL, name, integer_type_node);
5469 DECL_INITIAL (decl) = value;
5470 TREE_TYPE (value) = integer_type_node;
5473 return saveable_tree_cons (decl, value, NULL_TREE);
5476 /* Create the FUNCTION_DECL for a function definition.
5477 DECLSPECS and DECLARATOR are the parts of the declaration;
5478 they describe the function's name and the type it returns,
5479 but twisted together in a fashion that parallels the syntax of C.
5481 This function creates a binding context for the function body
5482 as well as setting up the FUNCTION_DECL in current_function_decl.
5484 Returns 1 on success. If the DECLARATOR is not suitable for a function
5485 (it defines a datum instead), we return 0, which tells
5486 yyparse to report a parse error.
5488 NESTED is nonzero for a function nested within another function. */
5491 start_function (declspecs, declarator, nested)
5492 tree declarator, declspecs;
5495 tree decl1, old_decl;
5498 current_function_returns_value = 0; /* Assume, until we see it does. */
5499 current_function_returns_null = 0;
5500 warn_about_return_type = 0;
5501 current_extern_inline = 0;
5502 c_function_varargs = 0;
5504 shadowed_labels = 0;
5506 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5508 /* If the declarator is not suitable for a function definition,
5509 cause a syntax error. */
5513 announce_function (decl1);
5515 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5517 error ("return-type is an incomplete type");
5518 /* Make it return void instead. */
5520 = build_function_type (void_type_node,
5521 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5524 if (warn_about_return_type)
5525 warning ("return-type defaults to `int'");
5527 /* Save the parm names or decls from this function's declarator
5528 where store_parm_decls will find them. */
5529 current_function_parms = last_function_parms;
5530 current_function_parm_tags = last_function_parm_tags;
5532 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5533 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5534 DECL_INITIAL (decl1) = error_mark_node;
5536 /* If this definition isn't a prototype and we had a prototype declaration
5537 before, copy the arg type info from that prototype.
5538 But not if what we had before was a builtin function. */
5539 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5540 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5541 && !DECL_BUILT_IN (old_decl)
5542 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5543 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5544 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5545 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5547 /* Optionally warn of old-fashioned def with no previous prototype. */
5548 if (warn_strict_prototypes
5549 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5550 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5551 warning ("function declaration isn't a prototype");
5552 /* Optionally warn of any global def with no previous prototype. */
5553 else if (warn_missing_prototypes
5554 && TREE_PUBLIC (decl1)
5555 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5556 warning_with_decl (decl1, "no previous prototype for `%s'");
5557 /* Optionally warn of any def with no previous prototype
5558 if the function has already been used. */
5559 else if (warn_missing_prototypes
5560 && old_decl != 0 && TREE_USED (old_decl)
5561 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5562 warning_with_decl (decl1, "`%s' was used with no prototype before its definition");
5564 /* This is a definition, not a reference.
5565 So normally clear DECL_EXTERNAL.
5566 However, `extern inline' acts like a declaration
5567 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5568 DECL_EXTERNAL (decl1) = current_extern_inline;
5570 /* This function exists in static storage.
5571 (This does not mean `static' in the C sense!) */
5572 TREE_STATIC (decl1) = 1;
5574 /* A nested function is not global. */
5575 if (current_function_decl != 0)
5576 TREE_PUBLIC (decl1) = 0;
5578 /* Record the decl so that the function name is defined.
5579 If we already have a decl for this name, and it is a FUNCTION_DECL,
5580 use the old decl. */
5582 current_function_decl = pushdecl (decl1);
5585 declare_parm_level (1);
5586 current_binding_level->subblocks_tag_transparent = 1;
5588 make_function_rtl (current_function_decl);
5590 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5591 /* Promote the value to int before returning it. */
5592 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5594 /* It retains unsignedness if traditional
5595 or if not really getting wider. */
5596 if (TREE_UNSIGNED (restype)
5597 && (flag_traditional
5598 || (TYPE_PRECISION (restype)
5599 == TYPE_PRECISION (integer_type_node))))
5600 restype = unsigned_type_node;
5602 restype = integer_type_node;
5604 DECL_RESULT (current_function_decl)
5605 = build_decl (RESULT_DECL, NULL_TREE, restype);
5608 /* Allocate further tree nodes temporarily during compilation
5609 of this function only. */
5610 temporary_allocation ();
5612 /* If this fcn was already referenced via a block-scope `extern' decl
5613 (or an implicit decl), propagate certain information about the usage. */
5614 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5615 TREE_ADDRESSABLE (current_function_decl) = 1;
5620 /* Record that this function is going to be a varargs function.
5621 This is called before store_parm_decls, which is too early
5622 to call mark_varargs directly. */
5627 c_function_varargs = 1;
5630 /* Store the parameter declarations into the current function declaration.
5631 This is called after parsing the parameter declarations, before
5632 digesting the body of the function.
5634 For an old-style definition, modify the function's type
5635 to specify at least the number of arguments. */
5640 register tree fndecl = current_function_decl;
5643 /* This is either a chain of PARM_DECLs (if a prototype was used)
5644 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5645 tree specparms = current_function_parms;
5647 /* This is a list of types declared among parms in a prototype. */
5648 tree parmtags = current_function_parm_tags;
5650 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5651 register tree parmdecls = getdecls ();
5653 /* This is a chain of any other decls that came in among the parm
5654 declarations. If a parm is declared with enum {foo, bar} x;
5655 then CONST_DECLs for foo and bar are put here. */
5658 /* Nonzero if this definition is written with a prototype. */
5661 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5663 /* This case is when the function was defined with an ANSI prototype.
5664 The parms already have decls, so we need not do anything here
5665 except record them as in effect
5666 and complain if any redundant old-style parm decls were written. */
5677 error_with_decl (fndecl,
5678 "parm types given both in parmlist and separately");
5679 /* Get rid of the erroneous decls; don't keep them on
5680 the list of parms, since they might not be PARM_DECLs. */
5681 for (decl = current_binding_level->names;
5682 decl; decl = TREE_CHAIN (decl))
5683 if (DECL_NAME (decl))
5684 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5685 for (link = current_binding_level->shadowed;
5686 link; link = TREE_CHAIN (link))
5687 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5688 current_binding_level->names = 0;
5689 current_binding_level->shadowed = 0;
5692 specparms = nreverse (specparms);
5693 for (parm = specparms; parm; parm = next)
5695 next = TREE_CHAIN (parm);
5696 if (TREE_CODE (parm) == PARM_DECL)
5698 if (DECL_NAME (parm) == 0)
5699 error_with_decl (parm, "parameter name omitted");
5700 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5702 error_with_decl (parm, "parameter `%s' declared void");
5703 /* Change the type to error_mark_node so this parameter
5704 will be ignored by assign_parms. */
5705 TREE_TYPE (parm) = error_mark_node;
5711 /* If we find an enum constant or a type tag,
5712 put it aside for the moment. */
5713 TREE_CHAIN (parm) = 0;
5714 others = chainon (others, parm);
5718 /* Get the decls in their original chain order
5719 and record in the function. */
5720 DECL_ARGUMENTS (fndecl) = getdecls ();
5723 /* If this function takes a variable number of arguments,
5724 add a phony parameter to the end of the parm list,
5725 to represent the position of the first unnamed argument. */
5726 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
5729 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
5730 /* Let's hope the address of the unnamed parm
5731 won't depend on its type. */
5732 TREE_TYPE (dummy) = integer_type_node;
5733 DECL_ARG_TYPE (dummy) = integer_type_node;
5734 DECL_ARGUMENTS (fndecl)
5735 = chainon (DECL_ARGUMENTS (fndecl), dummy);
5739 /* Now pushdecl the enum constants. */
5740 for (parm = others; parm; parm = next)
5742 next = TREE_CHAIN (parm);
5743 if (DECL_NAME (parm) == 0)
5745 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5747 else if (TREE_CODE (parm) != PARM_DECL)
5751 storetags (chainon (parmtags, gettags ()));
5755 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
5756 each with a parm name as the TREE_VALUE.
5758 PARMDECLS is a chain of declarations for parameters.
5759 Warning! It can also contain CONST_DECLs which are not parameters
5760 but are names of enumerators of any enum types
5761 declared among the parameters.
5763 First match each formal parameter name with its declaration.
5764 Associate decls with the names and store the decls
5765 into the TREE_PURPOSE slots. */
5767 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
5768 DECL_RESULT (parm) = 0;
5770 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
5772 register tree tail, found = NULL;
5774 if (TREE_VALUE (parm) == 0)
5776 error_with_decl (fndecl, "parameter name missing from parameter list");
5777 TREE_PURPOSE (parm) = 0;
5781 /* See if any of the parmdecls specifies this parm by name.
5782 Ignore any enumerator decls. */
5783 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
5784 if (DECL_NAME (tail) == TREE_VALUE (parm)
5785 && TREE_CODE (tail) == PARM_DECL)
5791 /* If declaration already marked, we have a duplicate name.
5792 Complain, and don't use this decl twice. */
5793 if (found && DECL_RESULT (found) != 0)
5795 error_with_decl (found, "multiple parameters named `%s'");
5799 /* If the declaration says "void", complain and ignore it. */
5800 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
5802 error_with_decl (found, "parameter `%s' declared void");
5803 TREE_TYPE (found) = integer_type_node;
5804 DECL_ARG_TYPE (found) = integer_type_node;
5805 layout_decl (found, 0);
5808 /* Traditionally, a parm declared float is actually a double. */
5809 if (found && flag_traditional
5810 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
5811 TREE_TYPE (found) = double_type_node;
5813 /* If no declaration found, default to int. */
5816 found = build_decl (PARM_DECL, TREE_VALUE (parm),
5818 DECL_ARG_TYPE (found) = TREE_TYPE (found);
5819 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
5820 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
5822 warning_with_decl (found, "type of `%s' defaults to `int'");
5826 TREE_PURPOSE (parm) = found;
5828 /* Mark this decl as "already found" -- see test, above.
5829 It is safe to use DECL_RESULT for this
5830 since it is not used in PARM_DECLs or CONST_DECLs. */
5831 DECL_RESULT (found) = error_mark_node;
5834 /* Put anything which is on the parmdecls chain and which is
5835 not a PARM_DECL onto the list NONPARMS. (The types of
5836 non-parm things which might appear on the list include
5837 enumerators and NULL-named TYPE_DECL nodes.) Complain about
5838 any actual PARM_DECLs not matched with any names. */
5841 for (parm = parmdecls; parm; )
5843 tree next = TREE_CHAIN (parm);
5844 TREE_CHAIN (parm) = 0;
5846 if (TREE_CODE (parm) != PARM_DECL)
5847 nonparms = chainon (nonparms, parm);
5850 /* Complain about args with incomplete types. */
5851 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
5853 error_with_decl (parm, "parameter `%s' has incomplete type");
5854 TREE_TYPE (parm) = error_mark_node;
5857 if (DECL_RESULT (parm) == 0)
5859 error_with_decl (parm,
5860 "declaration for parameter `%s' but no such parameter");
5861 /* Pretend the parameter was not missing.
5862 This gets us to a standard state and minimizes
5863 further error messages. */
5865 = chainon (specparms,
5866 tree_cons (parm, NULL_TREE, NULL_TREE));
5873 /* Chain the declarations together in the order of the list of names. */
5874 /* Store that chain in the function decl, replacing the list of names. */
5876 DECL_ARGUMENTS (fndecl) = 0;
5879 for (last = 0; parm; parm = TREE_CHAIN (parm))
5880 if (TREE_PURPOSE (parm))
5883 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
5885 TREE_CHAIN (last) = TREE_PURPOSE (parm);
5886 last = TREE_PURPOSE (parm);
5887 TREE_CHAIN (last) = 0;
5891 /* If there was a previous prototype,
5892 set the DECL_ARG_TYPE of each argument according to
5893 the type previously specified, and report any mismatches. */
5895 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
5898 for (parm = DECL_ARGUMENTS (fndecl),
5899 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
5900 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
5901 != void_type_node));
5902 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
5904 if (parm == 0 || type == 0
5905 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
5907 error ("number of arguments doesn't match prototype");
5910 /* Type for passing arg must be consistent
5911 with that declared for the arg. */
5912 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
5914 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
5915 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
5917 /* Adjust argument to match prototype. E.g. a previous
5918 `int foo(float);' prototype causes
5919 `int foo(x) float x; {...}' to be treated like
5920 `int foo(float x) {...}'. This is particularly
5921 useful for argument types like uid_t. */
5922 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
5923 #ifdef PROMOTE_PROTOTYPES
5924 if (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
5925 && TYPE_PRECISION (TREE_TYPE (parm))
5926 < TYPE_PRECISION (integer_type_node))
5927 DECL_ARG_TYPE (parm) = integer_type_node;
5930 pedwarn ("promoted argument `%s' doesn't match prototype",
5931 IDENTIFIER_POINTER (DECL_NAME (parm)));
5933 /* If -traditional, allow `int' argument to match
5934 `unsigned' prototype. */
5935 else if (! (flag_traditional
5936 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
5937 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
5938 error ("argument `%s' doesn't match prototype",
5939 IDENTIFIER_POINTER (DECL_NAME (parm)));
5942 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
5945 /* Otherwise, create a prototype that would match. */
5949 register tree actual, type;
5950 register tree last = 0;
5952 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
5954 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
5957 TREE_CHAIN (last) = type;
5962 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
5964 TREE_CHAIN (last) = type;
5968 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5969 of the type of this function, but we need to avoid having this
5970 affect the types of other similarly-typed functions, so we must
5971 first force the generation of an identical (but separate) type
5972 node for the relevant function type. The new node we create
5973 will be a variant of the main variant of the original function
5976 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
5978 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
5981 /* Now store the final chain of decls for the arguments
5982 as the decl-chain of the current lexical scope.
5983 Put the enumerators in as well, at the front so that
5984 DECL_ARGUMENTS is not modified. */
5986 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
5989 /* Make sure the binding level for the top of the function body
5990 gets a BLOCK if there are any in the function.
5991 Otherwise, the dbx output is wrong. */
5993 keep_next_if_subblocks = 1;
5995 /* ??? This might be an improvement,
5996 but needs to be thought about some more. */
5998 keep_next_level_flag = 1;
6001 /* Write a record describing this function definition to the prototypes
6002 file (if requested). */
6004 gen_aux_info_record (fndecl, 1, 0, prototype);
6006 /* Initialize the RTL code for the function. */
6008 init_function_start (fndecl, input_filename, lineno);
6010 /* If this is a varargs function, inform function.c. */
6012 if (c_function_varargs)
6015 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6017 declare_function_name ();
6019 /* Set up parameters and prepare for return, for the function. */
6021 expand_function_start (fndecl, 0);
6023 /* If this function is `main', emit a call to `__main'
6024 to run global initializers, etc. */
6025 if (DECL_NAME (fndecl)
6026 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6027 && DECL_CONTEXT (fndecl) == NULL_TREE)
6028 expand_main_function ();
6031 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6032 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6033 stands for an ellipsis in the identifier list.
6035 PARMLIST is the data returned by get_parm_info for the
6036 parmlist that follows the semicolon.
6038 We return a value of the same sort that get_parm_info returns,
6039 except that it describes the combination of identifiers and parmlist. */
6042 combine_parm_decls (specparms, parmlist, void_at_end)
6043 tree specparms, parmlist;
6046 register tree fndecl = current_function_decl;
6049 tree parmdecls = TREE_PURPOSE (parmlist);
6051 /* This is a chain of any other decls that came in among the parm
6052 declarations. They were separated already by get_parm_info,
6053 so we just need to keep them separate. */
6054 tree nonparms = TREE_VALUE (parmlist);
6058 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6059 DECL_RESULT (parm) = 0;
6061 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6063 register tree tail, found = NULL;
6065 /* See if any of the parmdecls specifies this parm by name. */
6066 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6067 if (DECL_NAME (tail) == TREE_VALUE (parm))
6073 /* If declaration already marked, we have a duplicate name.
6074 Complain, and don't use this decl twice. */
6075 if (found && DECL_RESULT (found) != 0)
6077 error_with_decl (found, "multiple parameters named `%s'");
6081 /* If the declaration says "void", complain and ignore it. */
6082 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6084 error_with_decl (found, "parameter `%s' declared void");
6085 TREE_TYPE (found) = integer_type_node;
6086 DECL_ARG_TYPE (found) = integer_type_node;
6087 layout_decl (found, 0);
6090 /* Traditionally, a parm declared float is actually a double. */
6091 if (found && flag_traditional
6092 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6093 TREE_TYPE (found) = double_type_node;
6095 /* If no declaration found, default to int. */
6098 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6100 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6101 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6102 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6103 error (found, "type of parameter `%s' is not declared");
6107 TREE_PURPOSE (parm) = found;
6109 /* Mark this decl as "already found" -- see test, above.
6110 It is safe to use DECL_RESULT for this
6111 since it is not used in PARM_DECLs or CONST_DECLs. */
6112 DECL_RESULT (found) = error_mark_node;
6115 /* Complain about any actual PARM_DECLs not matched with any names. */
6117 for (parm = parmdecls; parm; )
6119 tree next = TREE_CHAIN (parm);
6120 TREE_CHAIN (parm) = 0;
6122 /* Complain about args with incomplete types. */
6123 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6125 error_with_decl (parm, "parameter `%s' has incomplete type");
6126 TREE_TYPE (parm) = error_mark_node;
6129 if (DECL_RESULT (parm) == 0)
6131 error_with_decl (parm,
6132 "declaration for parameter `%s' but no such parameter");
6133 /* Pretend the parameter was not missing.
6134 This gets us to a standard state and minimizes
6135 further error messages. */
6137 = chainon (specparms,
6138 tree_cons (parm, NULL_TREE, NULL_TREE));
6144 /* Chain the declarations together in the order of the list of names.
6145 At the same time, build up a list of their types, in reverse order. */
6151 for (last = 0; parm; parm = TREE_CHAIN (parm))
6152 if (TREE_PURPOSE (parm))
6155 parmdecls = TREE_PURPOSE (parm);
6157 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6158 last = TREE_PURPOSE (parm);
6159 TREE_CHAIN (last) = 0;
6161 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6166 return saveable_tree_cons (parmdecls, nonparms,
6167 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6169 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6172 /* Finish up a function declaration and compile that function
6173 all the way to assembler language output. The free the storage
6174 for the function definition.
6176 This is called after parsing the body of the function definition.
6178 NESTED is nonzero if the function being finished is nested in another. */
6181 finish_function (nested)
6184 register tree fndecl = current_function_decl;
6186 /* TREE_READONLY (fndecl) = 1;
6187 This caused &foo to be of type ptr-to-const-function
6188 which then got a warning when stored in a ptr-to-function variable. */
6191 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6193 /* Must mark the RESULT_DECL as being in this function. */
6195 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6197 /* Obey `register' declarations if `setjmp' is called in this fn. */
6198 if (flag_traditional && current_function_calls_setjmp)
6200 setjmp_protect (DECL_INITIAL (fndecl));
6201 setjmp_protect_args ();
6204 #ifdef DEFAULT_MAIN_RETURN
6205 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6207 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6208 != integer_type_node)
6209 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6212 /* Make it so that `main' always returns success by default. */
6213 DEFAULT_MAIN_RETURN;
6218 /* Generate rtl for function exit. */
6219 expand_function_end (input_filename, lineno);
6221 /* So we can tell if jump_optimize sets it to 1. */
6224 /* Run the optimizers and output the assembler code for this function. */
6225 rest_of_compilation (fndecl);
6227 current_function_returns_null |= can_reach_end;
6229 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6230 warning ("`volatile' function does return");
6231 else if (warn_return_type && can_reach_end
6232 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6233 /* If this function returns non-void and control can drop through,
6235 warning ("control reaches end of non-void function");
6236 /* With just -W, complain only if function returns both with
6237 and without a value. */
6238 else if (extra_warnings
6239 && current_function_returns_value && current_function_returns_null)
6240 warning ("this function may return with or without a value");
6242 /* Free all the tree nodes making up this function. */
6243 /* Switch back to allocating nodes permanently
6244 until we start another function. */
6246 permanent_allocation ();
6248 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6250 /* Stop pointing to the local nodes about to be freed. */
6251 /* But DECL_INITIAL must remain nonzero so we know this
6252 was an actual function definition. */
6253 /* For a nested function, this is done in pop_c_function_context. */
6254 DECL_INITIAL (fndecl) = error_mark_node;
6255 DECL_ARGUMENTS (fndecl) = 0;
6260 /* Let the error reporting routines know that we're outside a
6261 function. For a nested function, this value is used in
6262 pop_c_function_context and then reset via pop_function_context. */
6263 current_function_decl = NULL;
6267 /* Save and restore the variables in this file and elsewhere
6268 that keep track of the progress of compilation of the current function.
6269 Used for nested functions. */
6273 struct c_function *next;
6274 tree enum_next_value;
6276 tree shadowed_labels;
6279 int warn_about_return_type;
6281 struct binding_level *binding_level;
6284 struct c_function *c_function_chain;
6286 /* Save and reinitialize the variables
6287 used during compilation of a C function. */
6290 push_c_function_context ()
6292 struct c_function *p
6293 = (struct c_function *) xmalloc (sizeof (struct c_function));
6296 pedwarn ("ANSI C forbids nested functions");
6298 push_function_context ();
6300 p->next = c_function_chain;
6301 c_function_chain = p;
6303 p->enum_next_value = enum_next_value;
6304 p->named_labels = named_labels;
6305 p->shadowed_labels = shadowed_labels;
6306 p->returns_value = current_function_returns_value;
6307 p->returns_null = current_function_returns_null;
6308 p->warn_about_return_type = warn_about_return_type;
6309 p->extern_inline = current_extern_inline;
6310 p->binding_level = current_binding_level;
6313 /* Restore the variables used during compilation of a C function. */
6316 pop_c_function_context ()
6318 struct c_function *p = c_function_chain;
6321 /* Bring back all the labels that were shadowed. */
6322 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6323 if (DECL_NAME (TREE_VALUE (link)) != 0)
6324 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6325 = TREE_VALUE (link);
6327 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6329 /* Stop pointing to the local nodes about to be freed. */
6330 /* But DECL_INITIAL must remain nonzero so we know this
6331 was an actual function definition. */
6332 DECL_INITIAL (current_function_decl) = error_mark_node;
6333 DECL_ARGUMENTS (current_function_decl) = 0;
6336 pop_function_context ();
6338 c_function_chain = p->next;
6340 enum_next_value = p->enum_next_value;
6341 named_labels = p->named_labels;
6342 shadowed_labels = p->shadowed_labels;
6343 current_function_returns_value = p->returns_value;
6344 current_function_returns_null = p->returns_null;
6345 warn_about_return_type = p->warn_about_return_type;
6346 current_extern_inline = p->extern_inline;
6347 current_binding_level = p->binding_level;