1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994 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
211 constant value. Note that will do not have to save this or `enum_overflow'
212 around nested function definition since such a definition could only
213 occur in an enum value expression and we don't use these variables in
216 static tree enum_next_value;
218 /* Nonzero means that there was overflow computing enum_next_value. */
220 static int enum_overflow;
222 /* Parsing a function declarator leaves a list of parameter names
223 or a chain or parameter decls here. */
225 static tree last_function_parms;
227 /* Parsing a function declarator leaves here a chain of structure
228 and enum types declared in the parmlist. */
230 static tree last_function_parm_tags;
232 /* After parsing the declarator that starts a function definition,
233 `start_function' puts here the list of parameter names or chain of decls.
234 `store_parm_decls' finds it here. */
236 static tree current_function_parms;
238 /* Similar, for last_function_parm_tags. */
239 static tree current_function_parm_tags;
241 /* Similar, for the file and line that the prototype came from if this is
242 an old-style definition. */
243 static char *current_function_prototype_file;
244 static int current_function_prototype_line;
246 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
247 that have names. Here so we can clear out their names' definitions
248 at the end of the function. */
250 static tree named_labels;
252 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
254 static tree shadowed_labels;
256 /* Nonzero when store_parm_decls is called indicates a varargs function.
257 Value not meaningful after store_parm_decls. */
259 static int c_function_varargs;
261 /* The FUNCTION_DECL for the function currently being compiled,
262 or 0 if between functions. */
263 tree current_function_decl;
265 /* Set to 0 at beginning of a function definition, set to 1 if
266 a return statement that specifies a return value is seen. */
268 int current_function_returns_value;
270 /* Set to 0 at beginning of a function definition, set to 1 if
271 a return statement with no argument is seen. */
273 int current_function_returns_null;
275 /* Set to nonzero by `grokdeclarator' for a function
276 whose return type is defaulted, if warnings for this are desired. */
278 static int warn_about_return_type;
280 /* Nonzero when starting a function declared `extern inline'. */
282 static int current_extern_inline;
284 /* For each binding contour we allocate a binding_level structure
285 * which records the names defined in that contour.
288 * 1) one for each function definition,
289 * where internal declarations of the parameters appear.
290 * 2) one for each compound statement,
291 * to record its declarations.
293 * The current meaning of a name can be found by searching the levels from
294 * the current one out to the global one.
297 /* Note that the information in the `names' component of the global contour
298 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
302 /* A chain of _DECL nodes for all variables, constants, functions,
303 and typedef types. These are in the reverse of the order supplied.
307 /* A list of structure, union and enum definitions,
308 * for looking up tag names.
309 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
310 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
311 * or ENUMERAL_TYPE node.
315 /* For each level, a list of shadowed outer-level local definitions
316 to be restored when this level is popped.
317 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
318 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
321 /* For each level (except not the global one),
322 a chain of BLOCK nodes for all the levels
323 that were entered and exited one level down. */
326 /* The BLOCK node for this level, if one has been preallocated.
327 If 0, the BLOCK is allocated (if needed) when the level is popped. */
330 /* The binding level which this one is contained in (inherits from). */
331 struct binding_level *level_chain;
333 /* Nonzero for the level that holds the parameters of a function. */
336 /* Nonzero if this level "doesn't exist" for tags. */
337 char tag_transparent;
339 /* Nonzero if sublevels of this level "don't exist" for tags.
340 This is set in the parm level of a function definition
341 while reading the function body, so that the outermost block
342 of the function body will be tag-transparent. */
343 char subblocks_tag_transparent;
345 /* Nonzero means make a BLOCK for this level regardless of all else. */
348 /* Nonzero means make a BLOCK if this level has any subblocks. */
349 char keep_if_subblocks;
351 /* Number of decls in `names' that have incomplete
352 structure or union types. */
355 /* A list of decls giving the (reversed) specified order of parms,
356 not including any forward-decls in the parmlist.
357 This is so we can put the parms in proper order for assign_parms. */
361 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
363 /* The binding level currently in effect. */
365 static struct binding_level *current_binding_level;
367 /* A chain of binding_level structures awaiting reuse. */
369 static struct binding_level *free_binding_level;
371 /* The outermost binding level, for names of file scope.
372 This is created when the compiler is started and exists
373 through the entire run. */
375 static struct binding_level *global_binding_level;
377 /* Binding level structures are initialized by copying this one. */
379 static struct binding_level clear_binding_level
380 = {NULL, NULL, NULL, NULL, NULL, NULL, 0, 0, 0};
382 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
384 static int keep_next_level_flag;
386 /* Nonzero means make a BLOCK for the next level pushed
387 if it has subblocks. */
389 static int keep_next_if_subblocks;
391 /* The chain of outer levels of label scopes.
392 This uses the same data structure used for binding levels,
393 but it works differently: each link in the chain records
394 saved values of named_labels and shadowed_labels for
395 a label binding level outside the current one. */
397 static struct binding_level *label_level_chain;
399 /* Forward declarations. */
401 static tree grokparms (), grokdeclarator ();
403 tree builtin_function ();
404 void shadow_tag_warned ();
406 static tree lookup_tag ();
407 static tree lookup_tag_reverse ();
408 tree lookup_name_current_level ();
409 static char *redeclaration_error_message ();
410 static void layout_array_type ();
412 /* C-specific option variables. */
414 /* Nonzero means allow type mismatches in conditional expressions;
415 just make their values `void'. */
417 int flag_cond_mismatch;
419 /* Nonzero means give `double' the same size as `float'. */
421 int flag_short_double;
423 /* Nonzero means don't recognize the keyword `asm'. */
427 /* Nonzero means don't recognize any builtin functions. */
431 /* Nonzero means don't recognize the non-ANSI builtin functions.
434 int flag_no_nonansi_builtin;
436 /* Nonzero means do some things the same way PCC does. */
438 int flag_traditional;
440 /* Nonzero means to allow single precision math even if we're generally
441 being traditional. */
442 int flag_allow_single_precision = 0;
444 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
446 int flag_signed_bitfields = 1;
447 int explicit_flag_signed_bitfields = 0;
449 /* Nonzero means handle `#ident' directives. 0 means ignore them. */
451 int flag_no_ident = 0;
453 /* Nonzero means warn about implicit declarations. */
457 /* Nonzero means give string constants the type `const char *'
458 to get extra warnings from them. These warnings will be too numerous
459 to be useful, except in thoroughly ANSIfied programs. */
461 int warn_write_strings;
463 /* Nonzero means warn about pointer casts that can drop a type qualifier
464 from the pointer target type. */
468 /* Warn about traditional constructs whose meanings changed in ANSI C. */
470 int warn_traditional;
472 /* Nonzero means warn about sizeof(function) or addition/subtraction
473 of function pointers. */
475 int warn_pointer_arith;
477 /* Nonzero means warn for non-prototype function decls
478 or non-prototyped defs without previous prototype. */
480 int warn_strict_prototypes;
482 /* Nonzero means warn for any global function def
483 without separate previous prototype decl. */
485 int warn_missing_prototypes;
487 /* Nonzero means warn for any global function def
488 without separate previous decl. */
490 int warn_missing_declarations;
492 /* Nonzero means warn about multiple (redundant) decls for the same single
493 variable or function. */
495 int warn_redundant_decls = 0;
497 /* Nonzero means warn about extern declarations of objects not at
498 file-scope level and about *all* declarations of functions (whether
499 extern or static) not at file-scope level. Note that we exclude
500 implicit function declarations. To get warnings about those, use
503 int warn_nested_externs = 0;
505 /* Warn about *printf or *scanf format/argument anomalies. */
509 /* Warn about a subscript that has type char. */
511 int warn_char_subscripts = 0;
513 /* Warn if a type conversion is done that might have confusing results. */
517 /* Warn if adding () is suggested. */
519 int warn_parentheses;
521 /* Warn if initializer is not completely bracketed. */
523 int warn_missing_braces;
525 /* Nonzero means `$' can be in an identifier.
526 See cccp.c for reasons why this breaks some obscure ANSI C programs. */
528 #ifndef DOLLARS_IN_IDENTIFIERS
529 #define DOLLARS_IN_IDENTIFIERS 1
531 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
533 /* Decode the string P as a language-specific option for C.
534 Return 1 if it is recognized (and handle it);
535 return 0 if not recognized. */
541 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
543 flag_traditional = 1;
544 flag_writable_strings = 1;
545 #if DOLLARS_IN_IDENTIFIERS > 0
546 dollars_in_ident = 1;
549 else if (!strcmp (p, "-fallow-single-precision"))
550 flag_allow_single_precision = 1;
551 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
553 flag_traditional = 0;
554 flag_writable_strings = 0;
555 dollars_in_ident = DOLLARS_IN_IDENTIFIERS > 1;
557 else if (!strcmp (p, "-fdollars-in-identifiers"))
559 #if DOLLARS_IN_IDENTIFIERS > 0
560 dollars_in_ident = 1;
563 else if (!strcmp (p, "-fnodollars-in-identifiers"))
564 dollars_in_ident = 0;
565 else if (!strcmp (p, "-fsigned-char"))
566 flag_signed_char = 1;
567 else if (!strcmp (p, "-funsigned-char"))
568 flag_signed_char = 0;
569 else if (!strcmp (p, "-fno-signed-char"))
570 flag_signed_char = 0;
571 else if (!strcmp (p, "-fno-unsigned-char"))
572 flag_signed_char = 1;
573 else if (!strcmp (p, "-fsigned-bitfields")
574 || !strcmp (p, "-fno-unsigned-bitfields"))
576 flag_signed_bitfields = 1;
577 explicit_flag_signed_bitfields = 1;
579 else if (!strcmp (p, "-funsigned-bitfields")
580 || !strcmp (p, "-fno-signed-bitfields"))
582 flag_signed_bitfields = 0;
583 explicit_flag_signed_bitfields = 1;
585 else if (!strcmp (p, "-fshort-enums"))
586 flag_short_enums = 1;
587 else if (!strcmp (p, "-fno-short-enums"))
588 flag_short_enums = 0;
589 else if (!strcmp (p, "-fcond-mismatch"))
590 flag_cond_mismatch = 1;
591 else if (!strcmp (p, "-fno-cond-mismatch"))
592 flag_cond_mismatch = 0;
593 else if (!strcmp (p, "-fshort-double"))
594 flag_short_double = 1;
595 else if (!strcmp (p, "-fno-short-double"))
596 flag_short_double = 0;
597 else if (!strcmp (p, "-fasm"))
599 else if (!strcmp (p, "-fno-asm"))
601 else if (!strcmp (p, "-fbuiltin"))
603 else if (!strcmp (p, "-fno-builtin"))
605 else if (!strcmp (p, "-fno-ident"))
607 else if (!strcmp (p, "-fident"))
609 else if (!strcmp (p, "-ansi"))
610 flag_no_asm = 1, flag_no_nonansi_builtin = 1, dollars_in_ident = 0;
611 else if (!strcmp (p, "-Wimplicit"))
613 else if (!strcmp (p, "-Wno-implicit"))
615 else if (!strcmp (p, "-Wwrite-strings"))
616 warn_write_strings = 1;
617 else if (!strcmp (p, "-Wno-write-strings"))
618 warn_write_strings = 0;
619 else if (!strcmp (p, "-Wcast-qual"))
621 else if (!strcmp (p, "-Wno-cast-qual"))
623 else if (!strcmp (p, "-Wpointer-arith"))
624 warn_pointer_arith = 1;
625 else if (!strcmp (p, "-Wno-pointer-arith"))
626 warn_pointer_arith = 0;
627 else if (!strcmp (p, "-Wstrict-prototypes"))
628 warn_strict_prototypes = 1;
629 else if (!strcmp (p, "-Wno-strict-prototypes"))
630 warn_strict_prototypes = 0;
631 else if (!strcmp (p, "-Wmissing-prototypes"))
632 warn_missing_prototypes = 1;
633 else if (!strcmp (p, "-Wno-missing-prototypes"))
634 warn_missing_prototypes = 0;
635 else if (!strcmp (p, "-Wmissing-declarations"))
636 warn_missing_declarations = 1;
637 else if (!strcmp (p, "-Wno-missing-declarations"))
638 warn_missing_declarations = 0;
639 else if (!strcmp (p, "-Wredundant-decls"))
640 warn_redundant_decls = 1;
641 else if (!strcmp (p, "-Wno-redundant-decls"))
642 warn_redundant_decls = 0;
643 else if (!strcmp (p, "-Wnested-externs"))
644 warn_nested_externs = 1;
645 else if (!strcmp (p, "-Wno-nested-externs"))
646 warn_nested_externs = 0;
647 else if (!strcmp (p, "-Wtraditional"))
648 warn_traditional = 1;
649 else if (!strcmp (p, "-Wno-traditional"))
650 warn_traditional = 0;
651 else if (!strcmp (p, "-Wformat"))
653 else if (!strcmp (p, "-Wno-format"))
655 else if (!strcmp (p, "-Wchar-subscripts"))
656 warn_char_subscripts = 1;
657 else if (!strcmp (p, "-Wno-char-subscripts"))
658 warn_char_subscripts = 0;
659 else if (!strcmp (p, "-Wconversion"))
661 else if (!strcmp (p, "-Wno-conversion"))
663 else if (!strcmp (p, "-Wparentheses"))
664 warn_parentheses = 1;
665 else if (!strcmp (p, "-Wno-parentheses"))
666 warn_parentheses = 0;
667 else if (!strcmp (p, "-Wreturn-type"))
668 warn_return_type = 1;
669 else if (!strcmp (p, "-Wno-return-type"))
670 warn_return_type = 0;
671 else if (!strcmp (p, "-Wcomment"))
672 ; /* cpp handles this one. */
673 else if (!strcmp (p, "-Wno-comment"))
674 ; /* cpp handles this one. */
675 else if (!strcmp (p, "-Wcomments"))
676 ; /* cpp handles this one. */
677 else if (!strcmp (p, "-Wno-comments"))
678 ; /* cpp handles this one. */
679 else if (!strcmp (p, "-Wtrigraphs"))
680 ; /* cpp handles this one. */
681 else if (!strcmp (p, "-Wno-trigraphs"))
682 ; /* cpp handles this one. */
683 else if (!strcmp (p, "-Wimport"))
684 ; /* cpp handles this one. */
685 else if (!strcmp (p, "-Wno-import"))
686 ; /* cpp handles this one. */
687 else if (!strcmp (p, "-Wmissing-braces"))
688 warn_missing_braces = 1;
689 else if (!strcmp (p, "-Wno-missing-braces"))
690 warn_missing_braces = 0;
691 else if (!strcmp (p, "-Wall"))
694 /* We save the value of warn_uninitialized, since if they put
695 -Wuninitialized on the command line, we need to generate a
696 warning about not using it without also specifying -O. */
697 if (warn_uninitialized != 1)
698 warn_uninitialized = 2;
700 warn_return_type = 1;
704 warn_char_subscripts = 1;
705 warn_parentheses = 1;
706 warn_missing_braces = 1;
714 /* Hooks for print_node. */
717 print_lang_decl (file, node, indent)
725 print_lang_type (file, node, indent)
733 print_lang_identifier (file, node, indent)
738 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
739 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
740 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
741 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
742 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
743 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
746 /* Hook called at end of compilation to assume 1 elt
747 for a top-level array decl that wasn't complete before. */
750 finish_incomplete_decl (decl)
753 if (TREE_CODE (decl) == VAR_DECL && TREE_TYPE (decl) != error_mark_node)
755 tree type = TREE_TYPE (decl);
756 if (TREE_CODE (type) == ARRAY_TYPE
757 && TYPE_DOMAIN (type) == 0
758 && TREE_CODE (decl) != TYPE_DECL)
760 complete_array_type (type, NULL_TREE, 1);
762 layout_decl (decl, 0);
767 /* Create a new `struct binding_level'. */
770 struct binding_level *
771 make_binding_level ()
774 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
777 /* Nonzero if we are currently in the global binding level. */
782 return current_binding_level == global_binding_level;
788 keep_next_level_flag = 1;
791 /* Nonzero if the current level needs to have a BLOCK made. */
796 return ((current_binding_level->keep_if_subblocks
797 && current_binding_level->blocks != 0)
798 || current_binding_level->keep
799 || current_binding_level->names != 0
800 || (current_binding_level->tags != 0
801 && !current_binding_level->tag_transparent));
804 /* Identify this binding level as a level of parameters.
805 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
806 But it turns out there is no way to pass the right value for
807 DEFINITION_FLAG, so we ignore it. */
810 declare_parm_level (definition_flag)
813 current_binding_level->parm_flag = 1;
816 /* Nonzero if currently making parm declarations. */
821 return current_binding_level->parm_flag;
824 /* Enter a new binding level.
825 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
826 not for that of tags. */
829 pushlevel (tag_transparent)
832 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
834 /* If this is the top level of a function,
835 just make sure that NAMED_LABELS is 0. */
837 if (current_binding_level == global_binding_level)
842 /* Reuse or create a struct for this binding level. */
844 if (free_binding_level)
846 newlevel = free_binding_level;
847 free_binding_level = free_binding_level->level_chain;
851 newlevel = make_binding_level ();
854 /* Add this level to the front of the chain (stack) of levels that
857 *newlevel = clear_binding_level;
858 newlevel->tag_transparent
860 || (current_binding_level
861 ? current_binding_level->subblocks_tag_transparent
863 newlevel->level_chain = current_binding_level;
864 current_binding_level = newlevel;
865 newlevel->keep = keep_next_level_flag;
866 keep_next_level_flag = 0;
867 newlevel->keep_if_subblocks = keep_next_if_subblocks;
868 keep_next_if_subblocks = 0;
871 /* Exit a binding level.
872 Pop the level off, and restore the state of the identifier-decl mappings
873 that were in effect when this level was entered.
875 If KEEP is nonzero, this level had explicit declarations, so
876 and create a "block" (a BLOCK node) for the level
877 to record its declarations and subblocks for symbol table output.
879 If FUNCTIONBODY is nonzero, this level is the body of a function,
880 so create a block as if KEEP were set and also clear out all
883 If REVERSE is nonzero, reverse the order of decls before putting
884 them into the BLOCK. */
887 poplevel (keep, reverse, functionbody)
893 /* The chain of decls was accumulated in reverse order.
894 Put it into forward order, just for cleanliness. */
896 tree tags = current_binding_level->tags;
897 tree subblocks = current_binding_level->blocks;
900 int block_previously_created;
902 keep |= current_binding_level->keep;
904 /* This warning is turned off because it causes warnings for
905 declarations like `extern struct foo *x'. */
907 /* Warn about incomplete structure types in this level. */
908 for (link = tags; link; link = TREE_CHAIN (link))
909 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
911 tree type = TREE_VALUE (link);
913 switch (TREE_CODE (type))
916 errmsg = "`struct %s' incomplete in scope ending here";
919 errmsg = "`union %s' incomplete in scope ending here";
922 errmsg = "`enum %s' incomplete in scope ending here";
925 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
926 error (errmsg, IDENTIFIER_POINTER (TYPE_NAME (type)));
928 /* If this type has a typedef-name, the TYPE_NAME is a TYPE_DECL. */
929 error (errmsg, IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))));
933 /* Get the decls in the order they were written.
934 Usually current_binding_level->names is in reverse order.
935 But parameter decls were previously put in forward order. */
938 current_binding_level->names
939 = decls = nreverse (current_binding_level->names);
941 decls = current_binding_level->names;
943 /* Output any nested inline functions within this block
944 if they weren't already output. */
946 for (decl = decls; decl; decl = TREE_CHAIN (decl))
947 if (TREE_CODE (decl) == FUNCTION_DECL
948 && ! TREE_ASM_WRITTEN (decl)
949 && DECL_INITIAL (decl) != 0
950 && TREE_ADDRESSABLE (decl))
952 /* If this decl was copied from a file-scope decl
953 on account of a block-scope extern decl,
954 propagate TREE_ADDRESSABLE to the file-scope decl. */
955 if (DECL_ABSTRACT_ORIGIN (decl) != 0)
956 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
959 push_function_context ();
960 output_inline_function (decl);
961 pop_function_context ();
965 /* If there were any declarations or structure tags in that level,
966 or if this level is a function body,
967 create a BLOCK to record them for the life of this function. */
970 block_previously_created = (current_binding_level->this_block != 0);
971 if (block_previously_created)
972 block = current_binding_level->this_block;
973 else if (keep || functionbody
974 || (current_binding_level->keep_if_subblocks && subblocks != 0))
975 block = make_node (BLOCK);
978 BLOCK_VARS (block) = decls;
979 BLOCK_TYPE_TAGS (block) = tags;
980 BLOCK_SUBBLOCKS (block) = subblocks;
981 remember_end_note (block);
984 /* In each subblock, record that this is its superior. */
986 for (link = subblocks; link; link = TREE_CHAIN (link))
987 BLOCK_SUPERCONTEXT (link) = block;
989 /* Clear out the meanings of the local variables of this level. */
991 for (link = decls; link; link = TREE_CHAIN (link))
993 if (DECL_NAME (link) != 0)
995 /* If the ident. was used or addressed via a local extern decl,
996 don't forget that fact. */
997 if (DECL_EXTERNAL (link))
999 if (TREE_USED (link))
1000 TREE_USED (DECL_NAME (link)) = 1;
1001 if (TREE_ADDRESSABLE (link))
1002 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1004 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1008 /* Restore all name-meanings of the outer levels
1009 that were shadowed by this level. */
1011 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1012 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1014 /* If the level being exited is the top level of a function,
1015 check over all the labels, and clear out the current
1016 (function local) meanings of their names. */
1020 /* If this is the top level block of a function,
1021 the vars are the function's parameters.
1022 Don't leave them in the BLOCK because they are
1023 found in the FUNCTION_DECL instead. */
1025 BLOCK_VARS (block) = 0;
1027 /* Clear out the definitions of all label names,
1028 since their scopes end here,
1029 and add them to BLOCK_VARS. */
1031 for (link = named_labels; link; link = TREE_CHAIN (link))
1033 register tree label = TREE_VALUE (link);
1035 if (DECL_INITIAL (label) == 0)
1037 error_with_decl (label, "label `%s' used but not defined");
1038 /* Avoid crashing later. */
1039 define_label (input_filename, lineno,
1042 else if (warn_unused && !TREE_USED (label))
1043 warning_with_decl (label, "label `%s' defined but not used");
1044 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1046 /* Put the labels into the "variables" of the
1047 top-level block, so debugger can see them. */
1048 TREE_CHAIN (label) = BLOCK_VARS (block);
1049 BLOCK_VARS (block) = label;
1053 /* Pop the current level, and free the structure for reuse. */
1056 register struct binding_level *level = current_binding_level;
1057 current_binding_level = current_binding_level->level_chain;
1059 level->level_chain = free_binding_level;
1060 free_binding_level = level;
1063 /* Dispose of the block that we just made inside some higher level. */
1065 DECL_INITIAL (current_function_decl) = block;
1068 if (!block_previously_created)
1069 current_binding_level->blocks
1070 = chainon (current_binding_level->blocks, block);
1072 /* If we did not make a block for the level just exited,
1073 any blocks made for inner levels
1074 (since they cannot be recorded as subblocks in that level)
1075 must be carried forward so they will later become subblocks
1076 of something else. */
1078 current_binding_level->blocks
1079 = chainon (current_binding_level->blocks, subblocks);
1081 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1082 binding contour so that they point to the appropriate construct, i.e.
1083 either to the current FUNCTION_DECL node, or else to the BLOCK node
1084 we just constructed.
1086 Note that for tagged types whose scope is just the formal parameter
1087 list for some function type specification, we can't properly set
1088 their TYPE_CONTEXTs here, because we don't have a pointer to the
1089 appropriate FUNCTION_TYPE node readily available to us. For those
1090 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1091 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1092 node which will represent the "scope" for these "parameter list local"
1097 for (link = tags; link; link = TREE_CHAIN (link))
1098 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1100 for (link = tags; link; link = TREE_CHAIN (link))
1101 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1104 TREE_USED (block) = 1;
1108 /* Delete the node BLOCK from the current binding level.
1109 This is used for the block inside a stmt expr ({...})
1110 so that the block can be reinserted where appropriate. */
1113 delete_block (block)
1117 if (current_binding_level->blocks == block)
1118 current_binding_level->blocks = TREE_CHAIN (block);
1119 for (t = current_binding_level->blocks; t;)
1121 if (TREE_CHAIN (t) == block)
1122 TREE_CHAIN (t) = TREE_CHAIN (block);
1126 TREE_CHAIN (block) = NULL;
1127 /* Clear TREE_USED which is always set by poplevel.
1128 The flag is set again if insert_block is called. */
1129 TREE_USED (block) = 0;
1132 /* Insert BLOCK at the end of the list of subblocks of the
1133 current binding level. This is used when a BIND_EXPR is expanded,
1134 to handle the BLOCK node inside the BIND_EXPR. */
1137 insert_block (block)
1140 TREE_USED (block) = 1;
1141 current_binding_level->blocks
1142 = chainon (current_binding_level->blocks, block);
1145 /* Set the BLOCK node for the innermost scope
1146 (the one we are currently in). */
1150 register tree block;
1152 current_binding_level->this_block = block;
1158 register struct binding_level *newlevel;
1160 /* Reuse or create a struct for this binding level. */
1162 if (free_binding_level)
1164 newlevel = free_binding_level;
1165 free_binding_level = free_binding_level->level_chain;
1169 newlevel = make_binding_level ();
1172 /* Add this level to the front of the chain (stack) of label levels. */
1174 newlevel->level_chain = label_level_chain;
1175 label_level_chain = newlevel;
1177 newlevel->names = named_labels;
1178 newlevel->shadowed = shadowed_labels;
1180 shadowed_labels = 0;
1186 register struct binding_level *level = label_level_chain;
1189 /* Clear out the definitions of the declared labels in this level.
1190 Leave in the list any ordinary, non-declared labels. */
1191 for (link = named_labels, prev = 0; link;)
1193 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1195 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1197 error_with_decl (TREE_VALUE (link),
1198 "label `%s' used but not defined");
1199 /* Avoid crashing later. */
1200 define_label (input_filename, lineno,
1201 DECL_NAME (TREE_VALUE (link)));
1203 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1204 warning_with_decl (TREE_VALUE (link),
1205 "label `%s' defined but not used");
1206 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1208 /* Delete this element from the list. */
1209 link = TREE_CHAIN (link);
1211 TREE_CHAIN (prev) = link;
1213 named_labels = link;
1218 link = TREE_CHAIN (link);
1222 /* Bring back all the labels that were shadowed. */
1223 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1224 if (DECL_NAME (TREE_VALUE (link)) != 0)
1225 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1226 = TREE_VALUE (link);
1228 named_labels = chainon (named_labels, level->names);
1229 shadowed_labels = level->shadowed;
1231 /* Pop the current level, and free the structure for reuse. */
1232 label_level_chain = label_level_chain->level_chain;
1233 level->level_chain = free_binding_level;
1234 free_binding_level = level;
1237 /* Push a definition or a declaration of struct, union or enum tag "name".
1238 "type" should be the type node.
1239 We assume that the tag "name" is not already defined.
1241 Note that the definition may really be just a forward reference.
1242 In that case, the TYPE_SIZE will be zero. */
1245 pushtag (name, type)
1248 register struct binding_level *b;
1250 /* Find the proper binding level for this type tag. */
1252 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1257 /* Record the identifier as the type's name if it has none. */
1259 if (TYPE_NAME (type) == 0)
1260 TYPE_NAME (type) = name;
1263 if (b == global_binding_level)
1264 b->tags = perm_tree_cons (name, type, b->tags);
1266 b->tags = saveable_tree_cons (name, type, b->tags);
1268 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1269 tagged type we just added to the current binding level. This fake
1270 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1271 to output a representation of a tagged type, and it also gives
1272 us a convenient place to record the "scope start" address for the
1275 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1278 /* Handle when a new declaration NEWDECL
1279 has the same name as an old one OLDDECL
1280 in the same binding contour.
1281 Prints an error message if appropriate.
1283 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1284 Otherwise, return 0. */
1287 duplicate_decls (newdecl, olddecl)
1288 register tree newdecl, olddecl;
1290 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1291 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1292 && DECL_INITIAL (newdecl) != 0);
1293 tree oldtype = TREE_TYPE (olddecl);
1294 tree newtype = TREE_TYPE (newdecl);
1296 if (TREE_CODE (newtype) == ERROR_MARK
1297 || TREE_CODE (oldtype) == ERROR_MARK)
1300 /* New decl is completely inconsistent with the old one =>
1301 tell caller to replace the old one.
1302 This is always an error except in the case of shadowing a builtin. */
1303 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1305 if (TREE_CODE (olddecl) == FUNCTION_DECL
1306 && (DECL_BUILT_IN (olddecl)
1307 || DECL_BUILT_IN_NONANSI (olddecl)))
1309 /* If you declare a built-in or predefined function name as static,
1310 the old definition is overridden,
1311 but optionally warn this was a bad choice of name. */
1312 if (!TREE_PUBLIC (newdecl))
1316 else if (DECL_BUILT_IN (olddecl))
1317 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1319 warning_with_decl (newdecl, "shadowing library function `%s'");
1321 /* Likewise, if the built-in is not ansi, then programs can
1322 override it even globally without an error. */
1323 else if (! DECL_BUILT_IN (olddecl))
1324 warning_with_decl (newdecl,
1325 "library function `%s' declared as non-function");
1327 else if (DECL_BUILT_IN_NONANSI (olddecl))
1328 warning_with_decl (newdecl,
1329 "built-in function `%s' declared as non-function");
1331 warning_with_decl (newdecl,
1332 "built-in function `%s' declared as non-function");
1336 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1337 error_with_decl (olddecl, "previous declaration of `%s'");
1343 /* For real parm decl following a forward decl,
1344 return 1 so old decl will be reused. */
1345 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1346 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1349 /* The new declaration is the same kind of object as the old one.
1350 The declarations may partially match. Print warnings if they don't
1351 match enough. Ultimately, copy most of the information from the new
1352 decl to the old one, and keep using the old one. */
1354 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1355 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1356 && DECL_INITIAL (olddecl) == 0)
1357 /* If -traditional, avoid error for redeclaring fcn
1358 after implicit decl. */
1360 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1361 && DECL_BUILT_IN (olddecl))
1363 /* A function declaration for a built-in function. */
1364 if (!TREE_PUBLIC (newdecl))
1366 /* If you declare a built-in function name as static, the
1367 built-in definition is overridden,
1368 but optionally warn this was a bad choice of name. */
1370 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1371 /* Discard the old built-in function. */
1374 else if (!types_match)
1376 /* Accept the return type of the new declaration if same modes. */
1377 tree oldreturntype = TREE_TYPE (TREE_TYPE (olddecl));
1378 tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
1379 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1381 /* Function types may be shared, so we can't just modify
1382 the return type of olddecl's function type. */
1384 = build_function_type (newreturntype,
1385 TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
1387 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1389 TREE_TYPE (olddecl) = newtype;
1391 /* Accept harmless mismatch in first argument type also.
1393 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1394 && TYPE_ARG_TYPES (TREE_TYPE (olddecl)) != 0
1395 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))) != 0
1396 && TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))) != 0
1397 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))))
1399 TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (olddecl))))))
1401 /* Function types may be shared, so we can't just modify
1402 the return type of olddecl's function type. */
1404 = build_function_type (TREE_TYPE (TREE_TYPE (olddecl)),
1405 tree_cons (NULL_TREE,
1406 TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (newdecl))),
1407 TREE_CHAIN (TYPE_ARG_TYPES (TREE_TYPE (olddecl)))));
1409 types_match = comptypes (TREE_TYPE (newdecl), newtype);
1411 TREE_TYPE (olddecl) = newtype;
1416 /* If types don't match for a built-in, throw away the built-in. */
1417 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1421 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1422 && DECL_SOURCE_LINE (olddecl) == 0)
1424 /* A function declaration for a predeclared function
1425 that isn't actually built in. */
1426 if (!TREE_PUBLIC (newdecl))
1428 /* If you declare it as static, the
1429 default definition is overridden. */
1432 else if (!types_match)
1434 /* If the types don't match, preserve volatility indication.
1435 Later on, we will discard everything else about the
1436 default declaration. */
1437 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1440 /* Permit char *foo () to match void *foo (...) if not pedantic,
1441 if one of them came from a system header file. */
1442 else if (!types_match
1443 && TREE_CODE (olddecl) == FUNCTION_DECL
1444 && TREE_CODE (newdecl) == FUNCTION_DECL
1445 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1446 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1447 && (DECL_IN_SYSTEM_HEADER (olddecl)
1448 || DECL_IN_SYSTEM_HEADER (newdecl))
1449 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1450 && TYPE_ARG_TYPES (oldtype) == 0
1451 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1452 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1454 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1455 && TYPE_ARG_TYPES (newtype) == 0
1456 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1457 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1460 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1461 /* Make sure we keep void * as ret type, not char *. */
1462 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1463 TREE_TYPE (newdecl) = newtype = oldtype;
1465 else if (!types_match
1466 /* Permit char *foo (int, ...); followed by char *foo ();
1468 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1470 /* Return types must still match. */
1471 && comptypes (TREE_TYPE (oldtype),
1472 TREE_TYPE (newtype))
1473 && TYPE_ARG_TYPES (newtype) == 0))
1475 error_with_decl (newdecl, "conflicting types for `%s'");
1476 /* Check for function type mismatch
1477 involving an empty arglist vs a nonempty one. */
1478 if (TREE_CODE (olddecl) == FUNCTION_DECL
1479 && comptypes (TREE_TYPE (oldtype),
1480 TREE_TYPE (newtype))
1481 && ((TYPE_ARG_TYPES (oldtype) == 0
1482 && DECL_INITIAL (olddecl) == 0)
1484 (TYPE_ARG_TYPES (newtype) == 0
1485 && DECL_INITIAL (newdecl) == 0)))
1487 /* Classify the problem further. */
1488 register tree t = TYPE_ARG_TYPES (oldtype);
1490 t = TYPE_ARG_TYPES (newtype);
1491 for (; t; t = TREE_CHAIN (t))
1493 register tree type = TREE_VALUE (t);
1495 if (TREE_CHAIN (t) == 0
1496 && TYPE_MAIN_VARIANT (type) != void_type_node)
1498 error ("A parameter list with an ellipsis can't match");
1499 error ("an empty parameter name list declaration.");
1503 if (TYPE_MAIN_VARIANT (type) == float_type_node
1504 || C_PROMOTING_INTEGER_TYPE_P (type))
1506 error ("An argument type that has a default promotion");
1507 error ("can't match an empty parameter name list declaration.");
1512 error_with_decl (olddecl, "previous declaration of `%s'");
1516 char *errmsg = redeclaration_error_message (newdecl, olddecl);
1519 error_with_decl (newdecl, errmsg);
1520 error_with_decl (olddecl,
1521 ((DECL_INITIAL (olddecl)
1522 && current_binding_level == global_binding_level)
1523 ? "`%s' previously defined here"
1524 : "`%s' previously declared here"));
1526 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1527 && DECL_INITIAL (olddecl) != 0
1528 && TYPE_ARG_TYPES (oldtype) == 0
1529 && TYPE_ARG_TYPES (newtype) != 0)
1531 register tree type, parm;
1533 /* Prototype decl follows defn w/o prototype. */
1535 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1536 type = TYPE_ARG_TYPES (newtype),
1538 (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) != void_type_node
1539 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) != void_type_node);
1540 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1542 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1543 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1545 errmsg = "prototype for `%s' follows and number of arguments";
1548 /* Type for passing arg must be consistent
1549 with that declared for the arg. */
1550 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1551 /* If -traditional, allow `unsigned int' instead of `int'
1552 in the prototype. */
1553 && (! (flag_traditional
1554 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1555 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1557 errmsg = "prototype for `%s' follows and argument %d";
1563 error_with_decl (newdecl, errmsg, nargs);
1564 error_with_decl (olddecl,
1565 "doesn't match non-prototype definition here");
1569 warning_with_decl (newdecl, "prototype for `%s' follows");
1570 warning_with_decl (olddecl, "non-prototype definition here");
1573 /* Warn about mismatches in various flags. */
1576 /* Warn if function is now inline
1577 but was previously declared not inline and has been called. */
1578 if (TREE_CODE (olddecl) == FUNCTION_DECL
1579 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1580 && TREE_USED (olddecl))
1581 warning_with_decl (newdecl,
1582 "`%s' declared inline after being called");
1583 if (TREE_CODE (olddecl) == FUNCTION_DECL
1584 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1585 && DECL_INITIAL (olddecl) != 0)
1586 warning_with_decl (newdecl,
1587 "`%s' declared inline after its definition");
1589 /* If pedantic, warn when static declaration follows a non-static
1590 declaration. Otherwise, do so only for functions. */
1591 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1592 && TREE_PUBLIC (olddecl)
1593 && !TREE_PUBLIC (newdecl))
1594 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1596 /* These bits are logically part of the type, for variables.
1597 But not for functions
1598 (where qualifiers are not valid ANSI anyway). */
1599 if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1600 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1601 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1602 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1606 /* Optionally warn about more than one declaration for the same name. */
1607 if (warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1608 /* Dont warn about a function declaration
1609 followed by a definition. */
1610 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1611 && DECL_INITIAL (olddecl) == 0)
1612 /* Don't warn about extern decl followed by (tentative) definition. */
1613 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1615 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1616 warning_with_decl (olddecl, "previous declaration of `%s'");
1619 /* Copy all the DECL_... slots specified in the new decl
1620 except for any that we copy here from the old type.
1622 Past this point, we don't change OLDTYPE and NEWTYPE
1623 even if we change the types of NEWDECL and OLDDECL. */
1627 /* Merge the data types specified in the two decls. */
1628 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1630 = TREE_TYPE (olddecl)
1631 = common_type (newtype, oldtype);
1633 /* Lay the type out, unless already done. */
1634 if (oldtype != TREE_TYPE (newdecl))
1636 if (TREE_TYPE (newdecl) != error_mark_node)
1637 layout_type (TREE_TYPE (newdecl));
1638 if (TREE_CODE (newdecl) != FUNCTION_DECL
1639 && TREE_CODE (newdecl) != TYPE_DECL
1640 && TREE_CODE (newdecl) != CONST_DECL)
1641 layout_decl (newdecl, 0);
1645 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1646 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1647 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1648 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1649 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1652 /* Keep the old rtl since we can safely use it. */
1653 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1655 /* Merge the type qualifiers. */
1656 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1657 && !TREE_THIS_VOLATILE (newdecl))
1658 TREE_THIS_VOLATILE (olddecl) = 0;
1659 if (TREE_READONLY (newdecl))
1660 TREE_READONLY (olddecl) = 1;
1661 if (TREE_THIS_VOLATILE (newdecl))
1663 TREE_THIS_VOLATILE (olddecl) = 1;
1664 if (TREE_CODE (newdecl) == VAR_DECL)
1665 make_var_volatile (newdecl);
1668 /* Keep source location of definition rather than declaration. */
1669 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0)
1671 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1672 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1675 /* Merge the unused-warning information. */
1676 if (DECL_IN_SYSTEM_HEADER (olddecl))
1677 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1678 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1679 DECL_IN_SYSTEM_HEADER (olddecl) = 1;
1681 /* Merge the initialization information. */
1682 if (DECL_INITIAL (newdecl) == 0)
1683 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1685 /* Merge the section attribute.
1686 We want to issue an error if the sections conflict but that must be
1687 done later in decl_attributes since we are called before attributes
1689 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1690 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1692 /* If cannot merge, then use the new type and qualifiers,
1693 and don't preserve the old rtl. */
1696 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1697 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1698 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1699 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1702 /* Merge the storage class information. */
1703 /* For functions, static overrides non-static. */
1704 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1706 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1707 /* This is since we don't automatically
1708 copy the attributes of NEWDECL into OLDDECL. */
1709 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1710 /* If this clears `static', clear it in the identifier too. */
1711 if (! TREE_PUBLIC (olddecl))
1712 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1714 if (DECL_EXTERNAL (newdecl))
1716 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1717 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1718 /* An extern decl does not override previous storage class. */
1719 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1723 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1724 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1727 /* If either decl says `inline', this fn is inline,
1728 unless its definition was passed already. */
1729 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1730 DECL_INLINE (olddecl) = 1;
1731 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1733 /* Get rid of any built-in function if new arg types don't match it
1734 or if we have a function definition. */
1735 if (TREE_CODE (newdecl) == FUNCTION_DECL
1736 && DECL_BUILT_IN (olddecl)
1737 && (!types_match || new_is_definition))
1739 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1740 DECL_BUILT_IN (olddecl) = 0;
1743 /* If redeclaring a builtin function, and not a definition,
1745 Also preserve various other info from the definition. */
1746 if (TREE_CODE (newdecl) == FUNCTION_DECL && !new_is_definition)
1748 if (DECL_BUILT_IN (olddecl))
1750 DECL_BUILT_IN (newdecl) = 1;
1751 DECL_SET_FUNCTION_CODE (newdecl, DECL_FUNCTION_CODE (olddecl));
1754 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
1756 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
1757 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1758 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
1759 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
1762 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1763 But preserve OLDdECL's DECL_UID. */
1765 register unsigned olddecl_uid = DECL_UID (olddecl);
1767 bcopy ((char *) newdecl + sizeof (struct tree_common),
1768 (char *) olddecl + sizeof (struct tree_common),
1769 sizeof (struct tree_decl) - sizeof (struct tree_common));
1770 DECL_UID (olddecl) = olddecl_uid;
1776 /* Record a decl-node X as belonging to the current lexical scope.
1777 Check for errors (such as an incompatible declaration for the same
1778 name already seen in the same scope).
1780 Returns either X or an old decl for the same name.
1781 If an old decl is returned, it may have been smashed
1782 to agree with what X says. */
1789 register tree name = DECL_NAME (x);
1790 register struct binding_level *b = current_binding_level;
1792 DECL_CONTEXT (x) = current_function_decl;
1793 /* A local extern declaration for a function doesn't constitute nesting.
1794 A local auto declaration does, since it's a forward decl
1795 for a nested function coming later. */
1796 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
1797 && DECL_EXTERNAL (x))
1798 DECL_CONTEXT (x) = 0;
1800 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
1801 && x != IDENTIFIER_IMPLICIT_DECL (name)
1802 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
1803 && !DECL_IN_SYSTEM_HEADER (x))
1804 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
1811 if (DECL_EXTERNAL (x) && TREE_PUBLIC (x))
1812 t = lookup_name (name);
1814 t = lookup_name_current_level (name);
1815 if (t != 0 && t == error_mark_node)
1816 /* error_mark_node is 0 for a while during initialization! */
1819 error_with_decl (x, "`%s' used prior to declaration");
1824 file = DECL_SOURCE_FILE (t);
1825 line = DECL_SOURCE_LINE (t);
1828 if (t != 0 && duplicate_decls (x, t))
1830 if (TREE_CODE (t) == PARM_DECL)
1832 /* Don't allow more than one "real" duplicate
1833 of a forward parm decl. */
1834 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
1837 /* If this decl is `static' and an implicit decl was seen previously,
1838 warn. But don't complain if -traditional,
1839 since traditional compilers don't complain. */
1840 if (!flag_traditional && TREE_PUBLIC (name)
1841 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x)
1842 /* We used to warn also for explicit extern followed by static,
1843 but sometimes you need to do it that way. */
1844 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
1846 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
1847 IDENTIFIER_POINTER (name));
1848 pedwarn_with_file_and_line (file, line,
1849 "previous declaration of `%s'",
1850 IDENTIFIER_POINTER (name));
1856 /* If we are processing a typedef statement, generate a whole new
1857 ..._TYPE node (which will be just an variant of the existing
1858 ..._TYPE node with identical properties) and then install the
1859 TYPE_DECL node generated to represent the typedef name as the
1860 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1862 The whole point here is to end up with a situation where each
1863 and every ..._TYPE node the compiler creates will be uniquely
1864 associated with AT MOST one node representing a typedef name.
1865 This way, even though the compiler substitutes corresponding
1866 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1867 early on, later parts of the compiler can always do the reverse
1868 translation and get back the corresponding typedef name. For
1871 typedef struct S MY_TYPE;
1874 Later parts of the compiler might only know that `object' was of
1875 type `struct S' if if were not for code just below. With this
1876 code however, later parts of the compiler see something like:
1878 struct S' == struct S
1879 typedef struct S' MY_TYPE;
1882 And they can then deduce (from the node for type struct S') that
1883 the original object declaration was:
1887 Being able to do this is important for proper support of protoize,
1888 and also for generating precise symbolic debugging information
1889 which takes full account of the programmer's (typedef) vocabulary.
1891 Obviously, we don't want to generate a duplicate ..._TYPE node if
1892 the TYPE_DECL node that we are now processing really represents a
1893 standard built-in type.
1895 Since all standard types are effectively declared at line zero
1896 in the source file, we can easily check to see if we are working
1897 on a standard type by checking the current value of lineno. */
1899 if (TREE_CODE (x) == TYPE_DECL)
1901 if (DECL_SOURCE_LINE (x) == 0)
1903 if (TYPE_NAME (TREE_TYPE (x)) == 0)
1904 TYPE_NAME (TREE_TYPE (x)) = x;
1906 else if (TREE_TYPE (x) != error_mark_node)
1908 tree tt = TREE_TYPE (x);
1910 tt = build_type_copy (tt);
1916 /* Multiple external decls of the same identifier ought to match.
1917 Check against out of scope (limbo) block level declarations.
1919 If this is a block level declaration, then DECL_EXTERNAL must also
1920 be set, so we have already checked against global declarations above
1921 via the lookup_name call.
1923 We get warnings about inline functions where they are defined.
1924 Avoid duplicate warnings where they are used. */
1925 if (TREE_PUBLIC (x) && ! DECL_INLINE (x)
1926 && IDENTIFIER_LIMBO_VALUE (name))
1928 tree decl = IDENTIFIER_LIMBO_VALUE (name);
1930 if (! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
1931 /* If old decl is built-in, we already warned if we should. */
1932 && !DECL_BUILT_IN (decl))
1934 pedwarn_with_decl (x,
1935 "type mismatch with previous external decl");
1936 pedwarn_with_decl (decl, "previous external decl of `%s'");
1940 /* If a function has had an implicit declaration, and then is defined,
1941 make sure they are compatible. */
1943 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
1944 && IDENTIFIER_GLOBAL_VALUE (name) == 0
1945 && TREE_CODE (x) == FUNCTION_DECL
1946 && ! comptypes (TREE_TYPE (x),
1947 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
1949 warning_with_decl (x, "type mismatch with previous implicit declaration");
1950 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
1951 "previous implicit declaration of `%s'");
1954 /* In PCC-compatibility mode, extern decls of vars with no current decl
1955 take effect at top level no matter where they are. */
1956 if (flag_traditional && DECL_EXTERNAL (x)
1957 && lookup_name (name) == 0)
1959 tree type = TREE_TYPE (x);
1961 /* But don't do this if the type contains temporary nodes. */
1964 if (type == error_mark_node)
1966 if (! TREE_PERMANENT (type))
1968 warning_with_decl (x, "type of external `%s' is not global");
1969 /* By exiting the loop early, we leave TYPE nonzero,
1970 and thus prevent globalization of the decl. */
1973 else if (TREE_CODE (type) == FUNCTION_TYPE
1974 && TYPE_ARG_TYPES (type) != 0)
1975 /* The types might not be truly local,
1976 but the list of arg types certainly is temporary.
1977 Since prototypes are nontraditional,
1978 ok not to do the traditional thing. */
1980 type = TREE_TYPE (type);
1984 b = global_binding_level;
1987 /* This name is new in its binding level.
1988 Install the new declaration and return it. */
1989 if (b == global_binding_level)
1991 /* Install a global value. */
1993 /* If the first global decl has external linkage,
1994 warn if we later see static one. */
1995 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
1996 TREE_PUBLIC (name) = 1;
1998 IDENTIFIER_GLOBAL_VALUE (name) = x;
2000 /* We no longer care about any previous block level declarations. */
2001 IDENTIFIER_LIMBO_VALUE (name) = 0;
2003 /* Don't forget if the function was used via an implicit decl. */
2004 if (IDENTIFIER_IMPLICIT_DECL (name)
2005 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2006 TREE_USED (x) = 1, TREE_USED (name) = 1;
2008 /* Don't forget if its address was taken in that way. */
2009 if (IDENTIFIER_IMPLICIT_DECL (name)
2010 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2011 TREE_ADDRESSABLE (x) = 1;
2013 /* Warn about mismatches against previous implicit decl. */
2014 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2015 /* If this real decl matches the implicit, don't complain. */
2016 && ! (TREE_CODE (x) == FUNCTION_DECL
2017 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2018 == integer_type_node)))
2019 pedwarn ("`%s' was previously implicitly declared to return `int'",
2020 IDENTIFIER_POINTER (name));
2022 /* If this decl is `static' and an `extern' was seen previously,
2023 that is erroneous. */
2024 if (TREE_PUBLIC (name)
2025 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2027 /* Okay to redeclare an ANSI built-in as static. */
2028 if (t != 0 && DECL_BUILT_IN (t))
2030 /* Okay to declare a non-ANSI built-in as anything. */
2031 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2033 else if (IDENTIFIER_IMPLICIT_DECL (name))
2034 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2035 IDENTIFIER_POINTER (name));
2037 pedwarn ("`%s' was declared `extern' and later `static'",
2038 IDENTIFIER_POINTER (name));
2043 /* Here to install a non-global value. */
2044 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2045 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2046 IDENTIFIER_LOCAL_VALUE (name) = x;
2048 /* If this is an extern function declaration, see if we
2049 have a global definition or declaration for the function. */
2051 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2053 && TREE_CODE (x) == FUNCTION_DECL
2054 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2056 /* We have one. Their types must agree. */
2057 if (! comptypes (TREE_TYPE (x),
2058 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2059 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2062 /* Inner extern decl is inline if global one is.
2063 Copy enough to really inline it. */
2064 if (DECL_INLINE (oldglobal))
2066 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2067 DECL_INITIAL (x) = (current_function_decl == oldglobal
2068 ? 0 : DECL_INITIAL (oldglobal));
2069 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2070 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2071 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2072 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2073 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2074 DECL_ABSTRACT_ORIGIN (x) = oldglobal;
2076 /* Inner extern decl is built-in if global one is. */
2077 if (DECL_BUILT_IN (oldglobal))
2079 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2080 DECL_SET_FUNCTION_CODE (x, DECL_FUNCTION_CODE (oldglobal));
2082 /* Keep the arg types from a file-scope fcn defn. */
2083 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2084 && DECL_INITIAL (oldglobal)
2085 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2086 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2090 #if 0 /* This case is probably sometimes the right thing to do. */
2091 /* If we have a local external declaration,
2092 then any file-scope declaration should not
2093 have been static. */
2094 if (oldlocal == 0 && oldglobal != 0
2095 && !TREE_PUBLIC (oldglobal)
2096 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2097 warning ("`%s' locally external but globally static",
2098 IDENTIFIER_POINTER (name));
2101 /* If we have a local external declaration,
2102 and no file-scope declaration has yet been seen,
2103 then if we later have a file-scope decl it must not be static. */
2106 && DECL_EXTERNAL (x)
2109 TREE_PUBLIC (name) = 1;
2111 /* Save this decl, so that we can do type checking against
2112 other decls after it falls out of scope.
2114 Only save it once. This prevents temporary decls created in
2115 expand_inline_function from being used here, since this
2116 will have been set when the inline function was parsed.
2117 It also helps give slightly better warnings. */
2118 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2119 IDENTIFIER_LIMBO_VALUE (name) = x;
2122 /* Warn if shadowing an argument at the top level of the body. */
2123 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2124 /* This warning doesn't apply to the parms of a nested fcn. */
2125 && ! current_binding_level->parm_flag
2126 /* Check that this is one level down from the parms. */
2127 && current_binding_level->level_chain->parm_flag
2128 /* Check that the decl being shadowed
2129 comes from the parm level, one level up. */
2130 && chain_member (oldlocal, current_binding_level->level_chain->names))
2132 if (TREE_CODE (oldlocal) == PARM_DECL)
2133 pedwarn ("declaration of `%s' shadows a parameter",
2134 IDENTIFIER_POINTER (name));
2136 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2137 IDENTIFIER_POINTER (name));
2140 /* Maybe warn if shadowing something else. */
2141 else if (warn_shadow && !DECL_EXTERNAL (x)
2142 /* No shadow warnings for internally generated vars. */
2143 && DECL_SOURCE_LINE (x) != 0
2144 /* No shadow warnings for vars made for inlining. */
2145 && ! DECL_FROM_INLINE (x))
2147 char *warnstring = 0;
2149 if (TREE_CODE (x) == PARM_DECL
2150 && current_binding_level->level_chain->parm_flag)
2151 /* Don't warn about the parm names in function declarator
2152 within a function declarator.
2153 It would be nice to avoid warning in any function
2154 declarator in a declaration, as opposed to a definition,
2155 but there is no way to tell it's not a definition. */
2157 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2158 warnstring = "declaration of `%s' shadows a parameter";
2159 else if (oldlocal != 0)
2160 warnstring = "declaration of `%s' shadows previous local";
2161 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2162 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2163 warnstring = "declaration of `%s' shadows global declaration";
2166 warning (warnstring, IDENTIFIER_POINTER (name));
2169 /* If storing a local value, there may already be one (inherited).
2170 If so, record it for restoration when this binding level ends. */
2172 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2175 /* Keep count of variables in this level with incomplete type. */
2176 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2180 /* Put decls on list in reverse order.
2181 We will reverse them later if necessary. */
2182 TREE_CHAIN (x) = b->names;
2188 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2191 pushdecl_top_level (x)
2195 register struct binding_level *b = current_binding_level;
2197 current_binding_level = global_binding_level;
2199 current_binding_level = b;
2203 /* Generate an implicit declaration for identifier FUNCTIONID
2204 as a function of type int (). Print a warning if appropriate. */
2207 implicitly_declare (functionid)
2211 int traditional_warning = 0;
2212 /* Only one "implicit declaration" warning per identifier. */
2213 int implicit_warning;
2215 /* Save the decl permanently so we can warn if definition follows. */
2216 push_obstacks_nochange ();
2217 end_temporary_allocation ();
2219 /* We used to reuse an old implicit decl here,
2220 but this loses with inline functions because it can clobber
2221 the saved decl chains. */
2222 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2223 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2225 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2227 /* Warn of implicit decl following explicit local extern decl.
2228 This is probably a program designed for traditional C. */
2229 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2230 traditional_warning = 1;
2232 /* Warn once of an implicit declaration. */
2233 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2235 DECL_EXTERNAL (decl) = 1;
2236 TREE_PUBLIC (decl) = 1;
2238 /* Record that we have an implicit decl and this is it. */
2239 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2241 /* ANSI standard says implicit declarations are in the innermost block.
2242 So we record the decl in the standard fashion.
2243 If flag_traditional is set, pushdecl does it top-level. */
2246 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2247 maybe_objc_check_decl (decl);
2249 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2251 if (warn_implicit && implicit_warning)
2252 warning ("implicit declaration of function `%s'",
2253 IDENTIFIER_POINTER (functionid));
2254 else if (warn_traditional && traditional_warning)
2255 warning ("function `%s' was previously declared within a block",
2256 IDENTIFIER_POINTER (functionid));
2258 /* Write a record describing this implicit function declaration to the
2259 prototypes file (if requested). */
2261 gen_aux_info_record (decl, 0, 1, 0);
2268 /* Return zero if the declaration NEWDECL is valid
2269 when the declaration OLDDECL (assumed to be for the same name)
2270 has already been seen.
2271 Otherwise return an error message format string with a %s
2272 where the identifier should go. */
2275 redeclaration_error_message (newdecl, olddecl)
2276 tree newdecl, olddecl;
2278 if (TREE_CODE (newdecl) == TYPE_DECL)
2280 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2282 return "redefinition of `%s'";
2284 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2286 /* Declarations of functions can insist on internal linkage
2287 but they can't be inconsistent with internal linkage,
2288 so there can be no error on that account.
2289 However defining the same name twice is no good. */
2290 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2291 /* However, defining once as extern inline and a second
2292 time in another way is ok. */
2293 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2294 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2295 return "redefinition of `%s'";
2298 else if (current_binding_level == global_binding_level)
2300 /* Objects declared at top level: */
2301 /* If at least one is a reference, it's ok. */
2302 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2304 /* Reject two definitions. */
2305 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2306 return "redefinition of `%s'";
2307 /* Now we have two tentative defs, or one tentative and one real def. */
2308 /* Insist that the linkage match. */
2309 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2310 return "conflicting declarations of `%s'";
2313 else if (current_binding_level->parm_flag
2314 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2318 /* Newdecl has block scope. If olddecl has block scope also, then
2319 reject two definitions, and reject a definition together with an
2320 external reference. Otherwise, it is OK, because newdecl must
2321 be an extern reference to olddecl. */
2322 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2323 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2324 return "redeclaration of `%s'";
2329 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2330 Create one if none exists so far for the current function.
2331 This function is called for both label definitions and label references. */
2337 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2339 if (current_function_decl == 0)
2341 error ("label %s referenced outside of any function",
2342 IDENTIFIER_POINTER (id));
2346 /* Use a label already defined or ref'd with this name. */
2349 /* But not if it is inherited and wasn't declared to be inheritable. */
2350 if (DECL_CONTEXT (decl) != current_function_decl
2351 && ! C_DECLARED_LABEL_FLAG (decl))
2352 return shadow_label (id);
2356 decl = build_decl (LABEL_DECL, id, void_type_node);
2358 /* Make sure every label has an rtx. */
2361 /* A label not explicitly declared must be local to where it's ref'd. */
2362 DECL_CONTEXT (decl) = current_function_decl;
2364 DECL_MODE (decl) = VOIDmode;
2366 /* Say where one reference is to the label,
2367 for the sake of the error if it is not defined. */
2368 DECL_SOURCE_LINE (decl) = lineno;
2369 DECL_SOURCE_FILE (decl) = input_filename;
2371 IDENTIFIER_LABEL_VALUE (id) = decl;
2373 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2378 /* Make a label named NAME in the current function,
2379 shadowing silently any that may be inherited from containing functions
2380 or containing scopes.
2382 Note that valid use, if the label being shadowed
2383 comes from another scope in the same function,
2384 requires calling declare_nonlocal_label right away. */
2390 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2394 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2395 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2398 return lookup_label (name);
2401 /* Define a label, specifying the location in the source file.
2402 Return the LABEL_DECL node for the label, if the definition is valid.
2403 Otherwise return 0. */
2406 define_label (filename, line, name)
2411 tree decl = lookup_label (name);
2413 /* If label with this name is known from an outer context, shadow it. */
2414 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2416 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2417 IDENTIFIER_LABEL_VALUE (name) = 0;
2418 decl = lookup_label (name);
2421 if (DECL_INITIAL (decl) != 0)
2423 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2428 /* Mark label as having been defined. */
2429 DECL_INITIAL (decl) = error_mark_node;
2430 /* Say where in the source. */
2431 DECL_SOURCE_FILE (decl) = filename;
2432 DECL_SOURCE_LINE (decl) = line;
2437 /* Return the list of declarations of the current level.
2438 Note that this list is in reverse order unless/until
2439 you nreverse it; and when you do nreverse it, you must
2440 store the result back using `storedecls' or you will lose. */
2445 return current_binding_level->names;
2448 /* Return the list of type-tags (for structs, etc) of the current level. */
2453 return current_binding_level->tags;
2456 /* Store the list of declarations of the current level.
2457 This is done for the parameter declarations of a function being defined,
2458 after they are modified in the light of any missing parameters. */
2464 current_binding_level->names = decls;
2467 /* Similarly, store the list of tags of the current level. */
2473 current_binding_level->tags = tags;
2476 /* Given NAME, an IDENTIFIER_NODE,
2477 return the structure (or union or enum) definition for that name.
2478 Searches binding levels from BINDING_LEVEL up to the global level.
2479 If THISLEVEL_ONLY is nonzero, searches only the specified context
2480 (but skips any tag-transparent contexts to find one that is
2481 meaningful for tags).
2482 CODE says which kind of type the caller wants;
2483 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2484 If the wrong kind of type is found, an error is reported. */
2487 lookup_tag (code, name, binding_level, thislevel_only)
2488 enum tree_code code;
2489 struct binding_level *binding_level;
2493 register struct binding_level *level;
2495 for (level = binding_level; level; level = level->level_chain)
2498 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2500 if (TREE_PURPOSE (tail) == name)
2502 if (TREE_CODE (TREE_VALUE (tail)) != code)
2504 /* Definition isn't the kind we were looking for. */
2505 pending_invalid_xref = name;
2506 pending_invalid_xref_file = input_filename;
2507 pending_invalid_xref_line = lineno;
2509 return TREE_VALUE (tail);
2512 if (thislevel_only && ! level->tag_transparent)
2518 /* Print an error message now
2519 for a recent invalid struct, union or enum cross reference.
2520 We don't print them immediately because they are not invalid
2521 when used in the `struct foo;' construct for shadowing. */
2524 pending_xref_error ()
2526 if (pending_invalid_xref != 0)
2527 error_with_file_and_line (pending_invalid_xref_file,
2528 pending_invalid_xref_line,
2529 "`%s' defined as wrong kind of tag",
2530 IDENTIFIER_POINTER (pending_invalid_xref));
2531 pending_invalid_xref = 0;
2534 /* Given a type, find the tag that was defined for it and return the tag name.
2535 Otherwise return 0. */
2538 lookup_tag_reverse (type)
2541 register struct binding_level *level;
2543 for (level = current_binding_level; level; level = level->level_chain)
2546 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2548 if (TREE_VALUE (tail) == type)
2549 return TREE_PURPOSE (tail);
2555 /* Look up NAME in the current binding level and its superiors
2556 in the namespace of variables, functions and typedefs.
2557 Return a ..._DECL node of some kind representing its definition,
2558 or return 0 if it is undefined. */
2565 if (current_binding_level != global_binding_level
2566 && IDENTIFIER_LOCAL_VALUE (name))
2567 val = IDENTIFIER_LOCAL_VALUE (name);
2569 val = IDENTIFIER_GLOBAL_VALUE (name);
2573 /* Similar to `lookup_name' but look only at current binding level. */
2576 lookup_name_current_level (name)
2581 if (current_binding_level == global_binding_level)
2582 return IDENTIFIER_GLOBAL_VALUE (name);
2584 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2587 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2588 if (DECL_NAME (t) == name)
2594 /* Create the predefined scalar types of C,
2595 and some nodes representing standard constants (0, 1, (void *)0).
2596 Initialize the global binding level.
2597 Make definitions for built-in primitive functions. */
2600 init_decl_processing ()
2602 register tree endlink;
2603 /* Either char* or void*. */
2604 tree traditional_ptr_type_node;
2605 /* Data types of memcpy and strlen. */
2606 tree memcpy_ftype, strlen_ftype;
2607 tree void_ftype_any;
2608 int wchar_type_size;
2610 tree array_domain_type;
2612 current_function_decl = NULL;
2613 named_labels = NULL;
2614 current_binding_level = NULL_BINDING_LEVEL;
2615 free_binding_level = NULL_BINDING_LEVEL;
2616 pushlevel (0); /* make the binding_level structure for global names */
2617 global_binding_level = current_binding_level;
2619 /* Define `int' and `char' first so that dbx will output them first. */
2621 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2622 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2623 integer_type_node));
2625 /* Define `char', which is like either `signed char' or `unsigned char'
2626 but not the same as either. */
2630 ? make_signed_type (CHAR_TYPE_SIZE)
2631 : make_unsigned_type (CHAR_TYPE_SIZE));
2632 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2635 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2636 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2637 long_integer_type_node));
2639 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2640 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
2641 unsigned_type_node));
2643 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
2644 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
2645 long_unsigned_type_node));
2647 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
2648 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
2649 long_long_integer_type_node));
2651 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
2652 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
2653 long_long_unsigned_type_node));
2655 /* `unsigned long' is the standard type for sizeof.
2656 Traditionally, use a signed type.
2657 Note that stddef.h uses `unsigned long',
2658 and this must agree, even of long and int are the same size. */
2660 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE)));
2661 if (flag_traditional && TREE_UNSIGNED (sizetype))
2662 sizetype = signed_type (sizetype);
2665 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
2667 TREE_TYPE (TYPE_SIZE (integer_type_node)) = sizetype;
2668 TREE_TYPE (TYPE_SIZE (char_type_node)) = sizetype;
2669 TREE_TYPE (TYPE_SIZE (unsigned_type_node)) = sizetype;
2670 TREE_TYPE (TYPE_SIZE (long_unsigned_type_node)) = sizetype;
2671 TREE_TYPE (TYPE_SIZE (long_integer_type_node)) = sizetype;
2672 TREE_TYPE (TYPE_SIZE (long_long_integer_type_node)) = sizetype;
2673 TREE_TYPE (TYPE_SIZE (long_long_unsigned_type_node)) = sizetype;
2675 error_mark_node = make_node (ERROR_MARK);
2676 TREE_TYPE (error_mark_node) = error_mark_node;
2678 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
2679 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
2680 short_integer_type_node));
2682 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
2683 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
2684 short_unsigned_type_node));
2686 /* Define both `signed char' and `unsigned char'. */
2687 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
2688 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
2689 signed_char_type_node));
2691 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
2692 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
2693 unsigned_char_type_node));
2695 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
2696 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
2698 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
2699 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
2701 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
2702 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
2704 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
2705 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
2707 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
2708 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
2710 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
2711 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
2713 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
2714 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
2716 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
2717 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
2719 float_type_node = make_node (REAL_TYPE);
2720 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
2721 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
2723 layout_type (float_type_node);
2725 double_type_node = make_node (REAL_TYPE);
2726 if (flag_short_double)
2727 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
2729 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
2730 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
2732 layout_type (double_type_node);
2734 long_double_type_node = make_node (REAL_TYPE);
2735 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
2736 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
2737 long_double_type_node));
2738 layout_type (long_double_type_node);
2740 complex_integer_type_node = make_node (COMPLEX_TYPE);
2741 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
2742 complex_integer_type_node));
2743 TREE_TYPE (complex_integer_type_node) = integer_type_node;
2744 layout_type (complex_integer_type_node);
2746 complex_float_type_node = make_node (COMPLEX_TYPE);
2747 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
2748 complex_float_type_node));
2749 TREE_TYPE (complex_float_type_node) = float_type_node;
2750 layout_type (complex_float_type_node);
2752 complex_double_type_node = make_node (COMPLEX_TYPE);
2753 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
2754 complex_double_type_node));
2755 TREE_TYPE (complex_double_type_node) = double_type_node;
2756 layout_type (complex_double_type_node);
2758 complex_long_double_type_node = make_node (COMPLEX_TYPE);
2759 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
2760 complex_long_double_type_node));
2761 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
2762 layout_type (complex_long_double_type_node);
2765 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
2766 wchar_type_size = TYPE_PRECISION (wchar_type_node);
2767 signed_wchar_type_node = signed_type (wchar_type_node);
2768 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
2770 integer_zero_node = build_int_2 (0, 0);
2771 TREE_TYPE (integer_zero_node) = integer_type_node;
2772 integer_one_node = build_int_2 (1, 0);
2773 TREE_TYPE (integer_one_node) = integer_type_node;
2775 size_zero_node = build_int_2 (0, 0);
2776 TREE_TYPE (size_zero_node) = sizetype;
2777 size_one_node = build_int_2 (1, 0);
2778 TREE_TYPE (size_one_node) = sizetype;
2780 void_type_node = make_node (VOID_TYPE);
2781 pushdecl (build_decl (TYPE_DECL,
2782 ridpointers[(int) RID_VOID], void_type_node));
2783 layout_type (void_type_node); /* Uses integer_zero_node */
2784 /* We are not going to have real types in C with less than byte alignment,
2785 so we might as well not have any types that claim to have it. */
2786 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
2788 null_pointer_node = build_int_2 (0, 0);
2789 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
2790 layout_type (TREE_TYPE (null_pointer_node));
2792 string_type_node = build_pointer_type (char_type_node);
2793 const_string_type_node
2794 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
2796 /* Make a type to be the domain of a few array types
2797 whose domains don't really matter.
2798 200 is small enough that it always fits in size_t
2799 and large enough that it can hold most function names for the
2800 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
2801 array_domain_type = build_index_type (build_int_2 (200, 0));
2803 /* make a type for arrays of characters.
2804 With luck nothing will ever really depend on the length of this
2806 char_array_type_node
2807 = build_array_type (char_type_node, array_domain_type);
2808 /* Likewise for arrays of ints. */
2810 = build_array_type (integer_type_node, array_domain_type);
2811 /* This is for wide string constants. */
2812 wchar_array_type_node
2813 = build_array_type (wchar_type_node, array_domain_type);
2815 default_function_type
2816 = build_function_type (integer_type_node, NULL_TREE);
2818 ptr_type_node = build_pointer_type (void_type_node);
2820 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
2822 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
2825 = build_function_type (void_type_node, NULL_TREE);
2828 = build_function_type (double_type_node,
2829 tree_cons (NULL_TREE, double_type_node, endlink));
2831 double_ftype_double_double
2832 = build_function_type (double_type_node,
2833 tree_cons (NULL_TREE, double_type_node,
2834 tree_cons (NULL_TREE,
2835 double_type_node, endlink)));
2838 = build_function_type (integer_type_node,
2839 tree_cons (NULL_TREE, integer_type_node, endlink));
2842 = build_function_type (long_integer_type_node,
2843 tree_cons (NULL_TREE,
2844 long_integer_type_node, endlink));
2846 void_ftype_ptr_ptr_int
2847 = build_function_type (void_type_node,
2848 tree_cons (NULL_TREE, ptr_type_node,
2849 tree_cons (NULL_TREE, ptr_type_node,
2850 tree_cons (NULL_TREE,
2854 int_ftype_cptr_cptr_sizet
2855 = build_function_type (integer_type_node,
2856 tree_cons (NULL_TREE, const_ptr_type_node,
2857 tree_cons (NULL_TREE, const_ptr_type_node,
2858 tree_cons (NULL_TREE,
2862 void_ftype_ptr_int_int
2863 = build_function_type (void_type_node,
2864 tree_cons (NULL_TREE, ptr_type_node,
2865 tree_cons (NULL_TREE, integer_type_node,
2866 tree_cons (NULL_TREE,
2870 string_ftype_ptr_ptr /* strcpy prototype */
2871 = build_function_type (string_type_node,
2872 tree_cons (NULL_TREE, string_type_node,
2873 tree_cons (NULL_TREE,
2874 const_string_type_node,
2877 int_ftype_string_string /* strcmp prototype */
2878 = build_function_type (integer_type_node,
2879 tree_cons (NULL_TREE, const_string_type_node,
2880 tree_cons (NULL_TREE,
2881 const_string_type_node,
2884 strlen_ftype /* strlen prototype */
2885 = build_function_type (flag_traditional ? integer_type_node : sizetype,
2886 tree_cons (NULL_TREE, const_string_type_node,
2889 traditional_ptr_type_node
2890 = (flag_traditional ? string_type_node : ptr_type_node);
2892 memcpy_ftype /* memcpy prototype */
2893 = build_function_type (traditional_ptr_type_node,
2894 tree_cons (NULL_TREE, ptr_type_node,
2895 tree_cons (NULL_TREE, const_ptr_type_node,
2896 tree_cons (NULL_TREE,
2900 builtin_function ("__builtin_constant_p", int_ftype_int,
2901 BUILT_IN_CONSTANT_P, NULL_PTR);
2903 builtin_function ("__builtin_return_address",
2904 build_function_type (ptr_type_node,
2905 tree_cons (NULL_TREE,
2908 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
2910 builtin_function ("__builtin_frame_address",
2911 build_function_type (ptr_type_node,
2912 tree_cons (NULL_TREE,
2915 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
2917 builtin_function ("__builtin_alloca",
2918 build_function_type (ptr_type_node,
2919 tree_cons (NULL_TREE,
2922 BUILT_IN_ALLOCA, "alloca");
2923 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2924 /* Define alloca, ffs as builtins.
2925 Declare _exit just to mark it as volatile. */
2926 if (! flag_no_builtin && !flag_no_nonansi_builtin)
2928 temp = builtin_function ("alloca",
2929 build_function_type (ptr_type_node,
2930 tree_cons (NULL_TREE,
2933 BUILT_IN_ALLOCA, NULL_PTR);
2934 /* Suppress error if redefined as a non-function. */
2935 DECL_BUILT_IN_NONANSI (temp) = 1;
2936 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
2937 /* Suppress error if redefined as a non-function. */
2938 DECL_BUILT_IN_NONANSI (temp) = 1;
2939 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
2941 TREE_THIS_VOLATILE (temp) = 1;
2942 TREE_SIDE_EFFECTS (temp) = 1;
2943 /* Suppress error if redefined as a non-function. */
2944 DECL_BUILT_IN_NONANSI (temp) = 1;
2947 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
2948 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
2950 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
2952 builtin_function ("__builtin_saveregs",
2953 build_function_type (ptr_type_node, NULL_TREE),
2954 BUILT_IN_SAVEREGS, NULL_PTR);
2955 /* EXPAND_BUILTIN_VARARGS is obsolete. */
2957 builtin_function ("__builtin_varargs",
2958 build_function_type (ptr_type_node,
2959 tree_cons (NULL_TREE,
2962 BUILT_IN_VARARGS, NULL_PTR);
2964 builtin_function ("__builtin_classify_type", default_function_type,
2965 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
2966 builtin_function ("__builtin_next_arg",
2967 build_function_type (ptr_type_node, NULL_TREE),
2968 BUILT_IN_NEXT_ARG, NULL_PTR);
2969 builtin_function ("__builtin_args_info",
2970 build_function_type (integer_type_node,
2971 tree_cons (NULL_TREE,
2974 BUILT_IN_ARGS_INFO, NULL_PTR);
2976 /* Untyped call and return. */
2977 builtin_function ("__builtin_apply_args",
2978 build_function_type (ptr_type_node, NULL_TREE),
2979 BUILT_IN_APPLY_ARGS, NULL_PTR);
2981 temp = tree_cons (NULL_TREE,
2982 build_pointer_type (build_function_type (void_type_node,
2984 tree_cons (NULL_TREE,
2986 tree_cons (NULL_TREE,
2989 builtin_function ("__builtin_apply",
2990 build_function_type (ptr_type_node, temp),
2991 BUILT_IN_APPLY, NULL_PTR);
2992 builtin_function ("__builtin_return",
2993 build_function_type (void_type_node,
2994 tree_cons (NULL_TREE,
2997 BUILT_IN_RETURN, NULL_PTR);
2999 /* Currently under experimentation. */
3000 builtin_function ("__builtin_memcpy", memcpy_ftype,
3001 BUILT_IN_MEMCPY, "memcpy");
3002 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3003 BUILT_IN_MEMCMP, "memcmp");
3004 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3005 BUILT_IN_STRCMP, "strcmp");
3006 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3007 BUILT_IN_STRCPY, "strcpy");
3008 builtin_function ("__builtin_strlen", strlen_ftype,
3009 BUILT_IN_STRLEN, "strlen");
3010 builtin_function ("__builtin_fsqrt", double_ftype_double,
3011 BUILT_IN_FSQRT, "sqrt");
3012 builtin_function ("__builtin_sin", double_ftype_double,
3013 BUILT_IN_SIN, "sin");
3014 builtin_function ("__builtin_cos", double_ftype_double,
3015 BUILT_IN_COS, "cos");
3017 /* In an ANSI C program, it is okay to supply built-in meanings
3018 for these functions, since applications cannot validly use them
3019 with any other meaning.
3020 However, honor the -fno-builtin option. */
3021 if (!flag_no_builtin)
3023 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3024 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3025 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3026 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3027 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3029 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3031 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3033 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3034 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3035 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3036 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3038 /* Declare these functions volatile
3039 to avoid spurious "control drops through" warnings. */
3040 /* Don't specify the argument types, to avoid errors
3041 from certain code which isn't valid in ANSI but which exists. */
3042 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3044 TREE_THIS_VOLATILE (temp) = 1;
3045 TREE_SIDE_EFFECTS (temp) = 1;
3046 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3047 TREE_THIS_VOLATILE (temp) = 1;
3048 TREE_SIDE_EFFECTS (temp) = 1;
3052 /* Support for these has not been written in either expand_builtin
3053 or build_function_call. */
3054 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3055 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3056 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3058 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3060 builtin_function ("__builtin_fmod", double_ftype_double_double,
3061 BUILT_IN_FMOD, NULL_PTR);
3062 builtin_function ("__builtin_frem", double_ftype_double_double,
3063 BUILT_IN_FREM, NULL_PTR);
3064 builtin_function ("__builtin_memset", ptr_ftype_ptr_int_int,
3065 BUILT_IN_MEMSET, NULL_PTR);
3066 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3068 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3072 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3073 declare_function_name ();
3075 start_identifier_warnings ();
3077 /* Prepare to check format strings against argument lists. */
3078 init_function_format_info ();
3082 incomplete_decl_finalize_hook = finish_incomplete_decl;
3085 /* Return a definition for a builtin function named NAME and whose data type
3086 is TYPE. TYPE should be a function type with argument types.
3087 FUNCTION_CODE tells later passes how to compile calls to this function.
3088 See tree.h for its possible values.
3090 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3091 the name to be called if we can't opencode the function. */
3094 builtin_function (name, type, function_code, library_name)
3097 enum built_in_function function_code;
3100 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3101 DECL_EXTERNAL (decl) = 1;
3102 TREE_PUBLIC (decl) = 1;
3103 /* If -traditional, permit redefining a builtin function any way you like.
3104 (Though really, if the program redefines these functions,
3105 it probably won't work right unless compiled with -fno-builtin.) */
3106 if (flag_traditional && name[0] != '_')
3107 DECL_BUILT_IN_NONANSI (decl) = 1;
3109 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3110 make_decl_rtl (decl, NULL_PTR, 1);
3112 if (function_code != NOT_BUILT_IN)
3114 DECL_BUILT_IN (decl) = 1;
3115 DECL_SET_FUNCTION_CODE (decl, function_code);
3117 /* Warn if a function in the namespace for users
3118 is used without an occasion to consider it declared. */
3119 if (name[0] != '_' || name[1] != '_')
3120 C_DECL_ANTICIPATED (decl) = 1;
3125 /* Called when a declaration is seen that contains no names to declare.
3126 If its type is a reference to a structure, union or enum inherited
3127 from a containing scope, shadow that tag name for the current scope
3128 with a forward reference.
3129 If its type defines a new named structure or union
3130 or defines an enum, it is valid but we need not do anything here.
3131 Otherwise, it is an error. */
3134 shadow_tag (declspecs)
3137 shadow_tag_warned (declspecs, 0);
3141 shadow_tag_warned (declspecs, warned)
3144 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3150 pending_invalid_xref = 0;
3152 for (link = declspecs; link; link = TREE_CHAIN (link))
3154 register tree value = TREE_VALUE (link);
3155 register enum tree_code code = TREE_CODE (value);
3157 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3158 /* Used to test also that TYPE_SIZE (value) != 0.
3159 That caused warning for `struct foo;' at top level in the file. */
3161 register tree name = lookup_tag_reverse (value);
3168 if (warned != 1 && code != ENUMERAL_TYPE)
3169 /* Empty unnamed enum OK */
3171 pedwarn ("unnamed struct/union that defines no instances");
3177 t = lookup_tag (code, name, current_binding_level, 1);
3181 t = make_node (code);
3190 warning ("useless keyword or type name in empty declaration");
3197 error ("two types specified in one empty declaration");
3202 pedwarn ("empty declaration");
3206 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3209 groktypename (typename)
3212 if (TREE_CODE (typename) != TREE_LIST)
3214 return grokdeclarator (TREE_VALUE (typename),
3215 TREE_PURPOSE (typename),
3219 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3222 groktypename_in_parm_context (typename)
3225 if (TREE_CODE (typename) != TREE_LIST)
3227 return grokdeclarator (TREE_VALUE (typename),
3228 TREE_PURPOSE (typename),
3232 /* Decode a declarator in an ordinary declaration or data definition.
3233 This is called as soon as the type information and variable name
3234 have been parsed, before parsing the initializer if any.
3235 Here we create the ..._DECL node, fill in its type,
3236 and put it on the list of decls for the current context.
3237 The ..._DECL node is returned as the value.
3239 Exception: for arrays where the length is not specified,
3240 the type is left null, to be filled in by `finish_decl'.
3242 Function definitions do not come here; they go to start_function
3243 instead. However, external and forward declarations of functions
3244 do go through here. Structure field declarations are done by
3245 grokfield and not through here. */
3247 /* Set this to zero to debug not using the temporary obstack
3248 to parse initializers. */
3249 int debug_temp_inits = 1;
3252 start_decl (declarator, declspecs, initialized)
3253 tree declarator, declspecs;
3256 register tree decl = grokdeclarator (declarator, declspecs,
3257 NORMAL, initialized);
3259 int init_written = initialized;
3261 /* The corresponding pop_obstacks is in finish_decl. */
3262 push_obstacks_nochange ();
3265 /* Is it valid for this decl to have an initializer at all?
3266 If not, set INITIALIZED to zero, which will indirectly
3267 tell `finish_decl' to ignore the initializer once it is parsed. */
3268 switch (TREE_CODE (decl))
3271 /* typedef foo = bar means give foo the same type as bar.
3272 We haven't parsed bar yet, so `finish_decl' will fix that up.
3273 Any other case of an initialization in a TYPE_DECL is an error. */
3274 if (pedantic || list_length (declspecs) > 1)
3276 error ("typedef `%s' is initialized",
3277 IDENTIFIER_POINTER (DECL_NAME (decl)));
3283 error ("function `%s' is initialized like a variable",
3284 IDENTIFIER_POINTER (DECL_NAME (decl)));
3289 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3290 error ("parameter `%s' is initialized",
3291 IDENTIFIER_POINTER (DECL_NAME (decl)));
3296 /* Don't allow initializations for incomplete types
3297 except for arrays which might be completed by the initialization. */
3298 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3300 /* A complete type is ok if size is fixed. */
3302 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3303 || C_DECL_VARIABLE_SIZE (decl))
3305 error ("variable-sized object may not be initialized");
3309 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3311 error ("variable `%s' has initializer but incomplete type",
3312 IDENTIFIER_POINTER (DECL_NAME (decl)));
3315 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3317 error ("elements of array `%s' have incomplete type",
3318 IDENTIFIER_POINTER (DECL_NAME (decl)));
3325 #if 0 /* Seems redundant with grokdeclarator. */
3326 if (current_binding_level != global_binding_level
3327 && DECL_EXTERNAL (decl)
3328 && TREE_CODE (decl) != FUNCTION_DECL)
3329 warning ("declaration of `%s' has `extern' and is initialized",
3330 IDENTIFIER_POINTER (DECL_NAME (decl)));
3332 DECL_EXTERNAL (decl) = 0;
3333 if (current_binding_level == global_binding_level)
3334 TREE_STATIC (decl) = 1;
3336 /* Tell `pushdecl' this is an initialized decl
3337 even though we don't yet have the initializer expression.
3338 Also tell `finish_decl' it may store the real initializer. */
3339 DECL_INITIAL (decl) = error_mark_node;
3342 /* If this is a function declaration, write a record describing it to the
3343 prototypes file (if requested). */
3345 if (TREE_CODE (decl) == FUNCTION_DECL)
3346 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3348 /* Add this decl to the current binding level.
3349 TEM may equal DECL or it may be a previous decl of the same name. */
3350 tem = pushdecl (decl);
3352 /* For C and Obective-C, we by default put things in .common when
3354 DECL_COMMON (tem) = 1;
3356 /* For a local variable, define the RTL now. */
3357 if (current_binding_level != global_binding_level
3358 /* But not if this is a duplicate decl
3359 and we preserved the rtl from the previous one
3360 (which may or may not happen). */
3361 && DECL_RTL (tem) == 0)
3363 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3365 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3366 && DECL_INITIAL (tem) != 0)
3372 /* When parsing and digesting the initializer,
3373 use temporary storage. Do this even if we will ignore the value. */
3374 if (current_binding_level == global_binding_level && debug_temp_inits)
3375 temporary_allocation ();
3381 /* Finish processing of a declaration;
3382 install its initial value.
3383 If the length of an array type is not known before,
3384 it must be determined now, from the initial value, or it is an error. */
3387 finish_decl (decl, init, asmspec_tree)
3391 register tree type = TREE_TYPE (decl);
3392 int was_incomplete = (DECL_SIZE (decl) == 0);
3393 int temporary = allocation_temporary_p ();
3397 asmspec = TREE_STRING_POINTER (asmspec_tree);
3399 /* If `start_decl' didn't like having an initialization, ignore it now. */
3401 if (init != 0 && DECL_INITIAL (decl) == 0)
3403 /* Don't crash if parm is initialized. */
3404 if (TREE_CODE (decl) == PARM_DECL)
3407 if (ITERATOR_P (decl))
3410 error_with_decl (decl, "iterator has no initial value");
3412 init = save_expr (init);
3417 if (TREE_CODE (decl) != TYPE_DECL)
3418 store_init_value (decl, init);
3421 /* typedef foo = bar; store the type of bar as the type of foo. */
3422 TREE_TYPE (decl) = TREE_TYPE (init);
3423 DECL_INITIAL (decl) = init = 0;
3427 /* Pop back to the obstack that is current for this binding level.
3428 This is because MAXINDEX, rtl, etc. to be made below
3429 must go in the permanent obstack. But don't discard the
3430 temporary data yet. */
3432 #if 0 /* pop_obstacks was near the end; this is what was here. */
3433 if (current_binding_level == global_binding_level && temporary)
3434 end_temporary_allocation ();
3437 /* Deduce size of array from initialization, if not already known */
3439 if (TREE_CODE (type) == ARRAY_TYPE
3440 && TYPE_DOMAIN (type) == 0
3441 && TREE_CODE (decl) != TYPE_DECL)
3444 = (TREE_STATIC (decl)
3445 /* Even if pedantic, an external linkage array
3446 may have incomplete type at first. */
3447 ? pedantic && !TREE_PUBLIC (decl)
3448 : !DECL_EXTERNAL (decl));
3450 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3452 /* Get the completed type made by complete_array_type. */
3453 type = TREE_TYPE (decl);
3456 error_with_decl (decl, "initializer fails to determine size of `%s'");
3461 error_with_decl (decl, "array size missing in `%s'");
3462 /* If a `static' var's size isn't known,
3463 make it extern as well as static, so it does not get
3465 If it is not `static', then do not mark extern;
3466 finish_incomplete_decl will give it a default size
3467 and it will get allocated. */
3468 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3469 DECL_EXTERNAL (decl) = 1;
3472 if (pedantic && TYPE_DOMAIN (type) != 0
3473 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) <= 0)
3474 error_with_decl (decl, "zero or negative size array `%s'");
3476 layout_decl (decl, 0);
3479 if (TREE_CODE (decl) == VAR_DECL)
3481 if (DECL_SIZE (decl) == 0
3482 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3483 layout_decl (decl, 0);
3485 if (DECL_SIZE (decl) == 0
3486 && (TREE_STATIC (decl)
3488 /* A static variable with an incomplete type
3489 is an error if it is initialized.
3490 Also if it is not file scope.
3491 Otherwise, let it through, but if it is not `extern'
3492 then it may cause an error message later. */
3493 (DECL_INITIAL (decl) != 0
3494 || current_binding_level != global_binding_level)
3496 /* An automatic variable with an incomplete type
3498 !DECL_EXTERNAL (decl)))
3500 error_with_decl (decl, "storage size of `%s' isn't known");
3501 TREE_TYPE (decl) = error_mark_node;
3504 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3505 && DECL_SIZE (decl) != 0)
3507 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3508 constant_expression_warning (DECL_SIZE (decl));
3510 error_with_decl (decl, "storage size of `%s' isn't constant");
3514 /* Output the assembler code and/or RTL code for variables and functions,
3515 unless the type is an undefined structure or union.
3516 If not, it will get done when the type is completed. */
3518 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3520 if (flag_traditional && allocation_temporary_p ())
3522 push_obstacks_nochange ();
3523 end_temporary_allocation ();
3524 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3525 maybe_objc_check_decl (decl);
3526 rest_of_decl_compilation (decl, asmspec,
3527 current_binding_level == global_binding_level,
3533 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3534 maybe_objc_check_decl (decl);
3535 rest_of_decl_compilation (decl, asmspec,
3536 current_binding_level == global_binding_level,
3539 if (current_binding_level != global_binding_level)
3541 /* Recompute the RTL of a local array now
3542 if it used to be an incomplete type. */
3544 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3546 /* If we used it already as memory, it must stay in memory. */
3547 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3548 /* If it's still incomplete now, no init will save it. */
3549 if (DECL_SIZE (decl) == 0)
3550 DECL_INITIAL (decl) = 0;
3553 /* Compute and store the initial value. */
3554 if (TREE_CODE (decl) != FUNCTION_DECL)
3555 expand_decl_init (decl);
3559 if (TREE_CODE (decl) == TYPE_DECL)
3561 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3562 maybe_objc_check_decl (decl);
3563 rest_of_decl_compilation (decl, NULL_PTR,
3564 current_binding_level == global_binding_level,
3568 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3569 /* This test used to include TREE_PERMANENT, however, we have the same
3570 problem with initializers at the function level. Such initializers get
3571 saved until the end of the function on the momentary_obstack. */
3572 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3574 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3575 space with DECL_ARG_TYPE. */
3576 && TREE_CODE (decl) != PARM_DECL)
3578 /* We need to remember that this array HAD an initialization,
3579 but discard the actual temporary nodes,
3580 since we can't have a permanent node keep pointing to them. */
3581 /* We make an exception for inline functions, since it's
3582 normal for a local extern redeclaration of an inline function
3583 to have a copy of the top-level decl's DECL_INLINE. */
3584 if (DECL_INITIAL (decl) != 0)
3586 /* If this is a const variable, then preserve the
3587 initializer instead of discarding it so that we can optimize
3588 references to it. */
3589 /* This test used to include TREE_STATIC, but this won't be set
3590 for function level initializers. */
3591 if (TREE_READONLY (decl))
3593 preserve_initializer ();
3594 /* Hack? Set the permanent bit for something that is permanent,
3595 but not on the permenent obstack, so as to convince
3596 output_constant_def to make its rtl on the permanent
3598 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3600 /* The initializer and DECL must have the same (or equivalent
3601 types), but if the initializer is a STRING_CST, its type
3602 might not be on the right obstack, so copy the type
3604 TREE_TYPE (DECL_INITIAL (decl)) = type;
3607 DECL_INITIAL (decl) = error_mark_node;
3611 /* If requested, warn about definitions of large data objects. */
3613 if (warn_larger_than
3614 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3615 && !DECL_EXTERNAL (decl))
3617 register tree decl_size = DECL_SIZE (decl);
3619 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3621 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3623 if (units > larger_than_size)
3624 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3629 /* Resume permanent allocation, if not within a function. */
3630 /* The corresponding push_obstacks_nochange is in start_decl,
3631 and in push_parm_decl and in grokfield. */
3635 /* If we have gone back from temporary to permanent allocation,
3636 actually free the temporary space that we no longer need. */
3637 if (temporary && !allocation_temporary_p ())
3638 permanent_allocation (0);
3640 /* At the end of a declaration, throw away any variable type sizes
3641 of types defined inside that declaration. There is no use
3642 computing them in the following function definition. */
3643 if (current_binding_level == global_binding_level)
3644 get_pending_sizes ();
3647 /* If DECL has a cleanup, build and return that cleanup here.
3648 This is a callback called by expand_expr. */
3651 maybe_build_cleanup (decl)
3654 /* There are no cleanups in C. */
3658 /* Given a parsed parameter declaration,
3659 decode it into a PARM_DECL and push that on the current binding level.
3660 Also, for the sake of forward parm decls,
3661 record the given order of parms in `parm_order'. */
3664 push_parm_decl (parm)
3668 int old_immediate_size_expand = immediate_size_expand;
3669 /* Don't try computing parm sizes now -- wait till fn is called. */
3670 immediate_size_expand = 0;
3672 /* The corresponding pop_obstacks is in finish_decl. */
3673 push_obstacks_nochange ();
3675 decl = grokdeclarator (TREE_VALUE (parm), TREE_PURPOSE (parm), PARM, 0);
3678 if (DECL_NAME (decl))
3681 olddecl = lookup_name (DECL_NAME (decl));
3682 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3683 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3687 decl = pushdecl (decl);
3689 immediate_size_expand = old_immediate_size_expand;
3691 current_binding_level->parm_order
3692 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3694 /* Add this decl to the current binding level. */
3695 finish_decl (decl, NULL_TREE, NULL_TREE);
3698 /* Clear the given order of parms in `parm_order'.
3699 Used at start of parm list,
3700 and also at semicolon terminating forward decls. */
3705 current_binding_level->parm_order = NULL_TREE;
3708 /* Make TYPE a complete type based on INITIAL_VALUE.
3709 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3710 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3713 complete_array_type (type, initial_value, do_default)
3718 register tree maxindex = NULL_TREE;
3723 /* Note MAXINDEX is really the maximum index,
3724 one less than the size. */
3725 if (TREE_CODE (initial_value) == STRING_CST)
3728 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3729 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3732 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3734 tree elts = CONSTRUCTOR_ELTS (initial_value);
3735 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3736 for (; elts; elts = TREE_CHAIN (elts))
3738 if (TREE_PURPOSE (elts))
3739 maxindex = TREE_PURPOSE (elts);
3741 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3743 maxindex = copy_node (maxindex);
3747 /* Make an error message unless that happened already. */
3748 if (initial_value != error_mark_node)
3751 /* Prevent further error messages. */
3752 maxindex = build_int_2 (0, 0);
3759 maxindex = build_int_2 (0, 0);
3765 TYPE_DOMAIN (type) = build_index_type (maxindex);
3766 if (!TREE_TYPE (maxindex))
3767 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
3768 #if 0 /* I took out this change
3769 together with the change in build_array_type. --rms */
3770 change_main_variant (type,
3771 build_array_type (TREE_TYPE (type),
3772 TYPE_DOMAIN (type)));
3776 /* Lay out the type now that we can get the real answer. */
3783 /* Given declspecs and a declarator,
3784 determine the name and type of the object declared
3785 and construct a ..._DECL node for it.
3786 (In one case we can return a ..._TYPE node instead.
3787 For invalid input we sometimes return 0.)
3789 DECLSPECS is a chain of tree_list nodes whose value fields
3790 are the storage classes and type specifiers.
3792 DECL_CONTEXT says which syntactic context this declaration is in:
3793 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3794 FUNCDEF for a function definition. Like NORMAL but a few different
3795 error messages in each case. Return value may be zero meaning
3796 this definition is too screwy to try to parse.
3797 PARM for a parameter declaration (either within a function prototype
3798 or before a function body). Make a PARM_DECL, or return void_type_node.
3799 TYPENAME if for a typename (in a cast or sizeof).
3800 Don't make a DECL node; just return the ..._TYPE node.
3801 FIELD for a struct or union field; make a FIELD_DECL.
3802 BITFIELD for a field with specified width.
3803 INITIALIZED is 1 if the decl has an initializer.
3805 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3806 It may also be so in the PARM case, for a prototype where the
3807 argument type is specified but not the name.
3809 This function is where the complicated C meanings of `static'
3810 and `extern' are interpreted. */
3813 grokdeclarator (declarator, declspecs, decl_context, initialized)
3816 enum decl_context decl_context;
3821 tree type = NULL_TREE;
3826 int explicit_int = 0;
3827 int explicit_char = 0;
3828 int defaulted_int = 0;
3829 tree typedef_decl = 0;
3831 tree typedef_type = 0;
3832 int funcdef_flag = 0;
3833 enum tree_code innermost_code = ERROR_MARK;
3835 int size_varies = 0;
3837 if (decl_context == BITFIELD)
3838 bitfield = 1, decl_context = FIELD;
3840 if (decl_context == FUNCDEF)
3841 funcdef_flag = 1, decl_context = NORMAL;
3843 push_obstacks_nochange ();
3845 if (flag_traditional && allocation_temporary_p ())
3846 end_temporary_allocation ();
3848 /* Look inside a declarator for the name being declared
3849 and get it as a string, for an error message. */
3851 register tree decl = declarator;
3855 switch (TREE_CODE (decl))
3860 innermost_code = TREE_CODE (decl);
3861 decl = TREE_OPERAND (decl, 0);
3864 case IDENTIFIER_NODE:
3865 name = IDENTIFIER_POINTER (decl);
3876 /* A function definition's declarator must have the form of
3877 a function declarator. */
3879 if (funcdef_flag && innermost_code != CALL_EXPR)
3882 /* Anything declared one level down from the top level
3883 must be one of the parameters of a function
3884 (because the body is at least two levels down). */
3886 /* If this looks like a function definition, make it one,
3887 even if it occurs where parms are expected.
3888 Then store_parm_decls will reject it and not use it as a parm. */
3889 if (decl_context == NORMAL && !funcdef_flag
3890 && current_binding_level->level_chain == global_binding_level)
3891 decl_context = PARM;
3893 /* Look through the decl specs and record which ones appear.
3894 Some typespecs are defined as built-in typenames.
3895 Others, the ones that are modifiers of other types,
3896 are represented by bits in SPECBITS: set the bits for
3897 the modifiers that appear. Storage class keywords are also in SPECBITS.
3899 If there is a typedef name or a type, store the type in TYPE.
3900 This includes builtin typedefs such as `int'.
3902 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3903 and did not come from a user typedef.
3905 Set LONGLONG if `long' is mentioned twice. */
3907 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
3910 register tree id = TREE_VALUE (spec);
3912 if (id == ridpointers[(int) RID_INT])
3914 if (id == ridpointers[(int) RID_CHAR])
3917 if (TREE_CODE (id) == IDENTIFIER_NODE)
3918 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
3920 if (ridpointers[i] == id)
3922 if (i == (int) RID_LONG && specbits & (1<<i))
3925 error ("`long long long' is too long for GCC");
3929 pedwarn ("ANSI C does not support `long long'");
3933 else if (specbits & (1 << i))
3934 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
3940 error ("two or more data types in declaration of `%s'", name);
3941 /* Actual typedefs come to us as TYPE_DECL nodes. */
3942 else if (TREE_CODE (id) == TYPE_DECL)
3944 type = TREE_TYPE (id);
3947 /* Built-in types come as identifiers. */
3948 else if (TREE_CODE (id) == IDENTIFIER_NODE)
3950 register tree t = lookup_name (id);
3951 if (TREE_TYPE (t) == error_mark_node)
3953 else if (!t || TREE_CODE (t) != TYPE_DECL)
3954 error ("`%s' fails to be a typedef or built in type",
3955 IDENTIFIER_POINTER (id));
3958 type = TREE_TYPE (t);
3962 else if (TREE_CODE (id) != ERROR_MARK)
3968 typedef_type = type;
3970 size_varies = C_TYPE_VARIABLE_SIZE (type);
3972 /* No type at all: default to `int', and set DEFAULTED_INT
3973 because it was not a user-defined typedef. */
3977 if (funcdef_flag && warn_return_type
3978 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
3979 | (1 << (int) RID_SIGNED) | (1 << (int) RID_UNSIGNED))))
3980 warn_about_return_type = 1;
3982 type = integer_type_node;
3985 /* Now process the modifiers that were specified
3986 and check for invalid combinations. */
3988 /* Long double is a special combination. */
3990 if ((specbits & 1 << (int) RID_LONG)
3991 && TYPE_MAIN_VARIANT (type) == double_type_node)
3993 specbits &= ~ (1 << (int) RID_LONG);
3994 type = long_double_type_node;
3997 /* Check all other uses of type modifiers. */
3999 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4000 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4004 if (TREE_CODE (type) != INTEGER_TYPE)
4005 error ("long, short, signed or unsigned invalid for `%s'", name);
4006 else if ((specbits & 1 << (int) RID_LONG)
4007 && (specbits & 1 << (int) RID_SHORT))
4008 error ("long and short specified together for `%s'", name);
4009 else if (((specbits & 1 << (int) RID_LONG)
4010 || (specbits & 1 << (int) RID_SHORT))
4012 error ("long or short specified with char for `%s'", name);
4013 else if (((specbits & 1 << (int) RID_LONG)
4014 || (specbits & 1 << (int) RID_SHORT))
4015 && TREE_CODE (type) == REAL_TYPE)
4016 error ("long or short specified with floating type for `%s'", name);
4017 else if ((specbits & 1 << (int) RID_SIGNED)
4018 && (specbits & 1 << (int) RID_UNSIGNED))
4019 error ("signed and unsigned given together for `%s'", name);
4023 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4025 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4027 if (flag_pedantic_errors)
4032 /* Discard the type modifiers if they are invalid. */
4035 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4036 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4041 if ((specbits & (1 << (int) RID_COMPLEX))
4042 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4044 error ("complex invalid for `%s'", name);
4045 specbits &= ~ (1 << (int) RID_COMPLEX);
4048 /* Decide whether an integer type is signed or not.
4049 Optionally treat bitfields as signed by default. */
4050 if (specbits & 1 << (int) RID_UNSIGNED
4051 /* Traditionally, all bitfields are unsigned. */
4052 || (bitfield && flag_traditional
4053 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4054 || (bitfield && ! flag_signed_bitfields
4055 && (explicit_int || defaulted_int || explicit_char
4056 /* A typedef for plain `int' without `signed'
4057 can be controlled just like plain `int'. */
4058 || ! (typedef_decl != 0
4059 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4060 && TREE_CODE (type) != ENUMERAL_TYPE
4061 && !(specbits & 1 << (int) RID_SIGNED)))
4064 type = long_long_unsigned_type_node;
4065 else if (specbits & 1 << (int) RID_LONG)
4066 type = long_unsigned_type_node;
4067 else if (specbits & 1 << (int) RID_SHORT)
4068 type = short_unsigned_type_node;
4069 else if (type == char_type_node)
4070 type = unsigned_char_type_node;
4071 else if (typedef_decl)
4072 type = unsigned_type (type);
4074 type = unsigned_type_node;
4076 else if ((specbits & 1 << (int) RID_SIGNED)
4077 && type == char_type_node)
4078 type = signed_char_type_node;
4080 type = long_long_integer_type_node;
4081 else if (specbits & 1 << (int) RID_LONG)
4082 type = long_integer_type_node;
4083 else if (specbits & 1 << (int) RID_SHORT)
4084 type = short_integer_type_node;
4086 if (specbits & 1 << (int) RID_COMPLEX)
4088 /* If we just have "complex", it is equivalent to
4089 "complex double", but if any modifiers at all are specified it is
4090 the complex form of TYPE. E.g, "complex short" is
4091 "complex short int". */
4093 if (defaulted_int && ! longlong
4094 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4095 | (1 << (int) RID_SIGNED)
4096 | (1 << (int) RID_UNSIGNED))))
4097 type = complex_double_type_node;
4098 else if (type == integer_type_node)
4099 type = complex_integer_type_node;
4100 else if (type == float_type_node)
4101 type = complex_float_type_node;
4102 else if (type == double_type_node)
4103 type = complex_double_type_node;
4104 else if (type == long_double_type_node)
4105 type = complex_long_double_type_node;
4107 type = build_complex_type (type);
4110 /* Set CONSTP if this declaration is `const', whether by
4111 explicit specification or via a typedef.
4112 Likewise for VOLATILEP. */
4114 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4115 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4116 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4118 pedwarn ("duplicate `const'");
4120 pedwarn ("duplicate `volatile'");
4121 if (! flag_gen_aux_info && (TYPE_READONLY (type) || TYPE_VOLATILE (type)))
4122 type = TYPE_MAIN_VARIANT (type);
4124 /* Warn if two storage classes are given. Default to `auto'. */
4129 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4130 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4131 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4132 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4133 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4134 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4136 /* Warn about storage classes that are invalid for certain
4137 kinds of declarations (parameters, typenames, etc.). */
4140 error ("multiple storage classes in declaration of `%s'", name);
4141 else if (funcdef_flag
4143 & ((1 << (int) RID_REGISTER)
4144 | (1 << (int) RID_AUTO)
4145 | (1 << (int) RID_TYPEDEF))))
4147 if (specbits & 1 << (int) RID_AUTO
4148 && (pedantic || current_binding_level == global_binding_level))
4149 pedwarn ("function definition declared `auto'");
4150 if (specbits & 1 << (int) RID_REGISTER)
4151 error ("function definition declared `register'");
4152 if (specbits & 1 << (int) RID_TYPEDEF)
4153 error ("function definition declared `typedef'");
4154 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4155 | (1 << (int) RID_AUTO));
4157 else if (decl_context != NORMAL && nclasses > 0)
4159 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4163 error ((decl_context == FIELD
4164 ? "storage class specified for structure field `%s'"
4165 : (decl_context == PARM
4166 ? "storage class specified for parameter `%s'"
4167 : "storage class specified for typename")),
4169 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4170 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4171 | (1 << (int) RID_EXTERN));
4174 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4176 /* `extern' with initialization is invalid if not at top level. */
4177 if (current_binding_level == global_binding_level)
4178 warning ("`%s' initialized and declared `extern'", name);
4180 error ("`%s' has both `extern' and initializer", name);
4182 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4183 && current_binding_level != global_binding_level)
4184 error ("nested function `%s' declared `extern'", name);
4185 else if (current_binding_level == global_binding_level
4186 && specbits & (1 << (int) RID_AUTO))
4187 error ("top-level declaration of `%s' specifies `auto'", name);
4188 else if ((specbits & 1 << (int) RID_ITERATOR)
4189 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4191 error ("iterator `%s' has derived type", name);
4192 type = error_mark_node;
4194 else if ((specbits & 1 << (int) RID_ITERATOR)
4195 && TREE_CODE (type) != INTEGER_TYPE)
4197 error ("iterator `%s' has noninteger type", name);
4198 type = error_mark_node;
4202 /* Now figure out the structure of the declarator proper.
4203 Descend through it, creating more complex types, until we reach
4204 the declared identifier (or NULL_TREE, in an absolute declarator). */
4206 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4208 if (type == error_mark_node)
4210 declarator = TREE_OPERAND (declarator, 0);
4214 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4215 an INDIRECT_REF (for *...),
4216 a CALL_EXPR (for ...(...)),
4217 an identifier (for the name being declared)
4218 or a null pointer (for the place in an absolute declarator
4219 where the name was omitted).
4220 For the last two cases, we have just exited the loop.
4222 At this point, TYPE is the type of elements of an array,
4223 or for a function to return, or for a pointer to point to.
4224 After this sequence of ifs, TYPE is the type of the
4225 array or function or pointer, and DECLARATOR has had its
4226 outermost layer removed. */
4228 if (TREE_CODE (declarator) == ARRAY_REF)
4230 register tree itype = NULL_TREE;
4231 register tree size = TREE_OPERAND (declarator, 1);
4232 /* An uninitialized decl with `extern' is a reference. */
4233 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4234 /* The index is a signed object `sizetype' bits wide. */
4235 tree index_type = signed_type (sizetype);
4237 declarator = TREE_OPERAND (declarator, 0);
4239 /* Check for some types that there cannot be arrays of. */
4241 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4243 error ("declaration of `%s' as array of voids", name);
4244 type = error_mark_node;
4247 if (TREE_CODE (type) == FUNCTION_TYPE)
4249 error ("declaration of `%s' as array of functions", name);
4250 type = error_mark_node;
4253 if (size == error_mark_node)
4254 type = error_mark_node;
4256 if (type == error_mark_node)
4259 /* If this is a block level extern, it must live past the end
4260 of the function so that we can check it against other extern
4261 declarations (IDENTIFIER_LIMBO_VALUE). */
4262 if (extern_ref && allocation_temporary_p ())
4263 end_temporary_allocation ();
4265 /* If size was specified, set ITYPE to a range-type for that size.
4266 Otherwise, ITYPE remains null. finish_decl may figure it out
4267 from an initial value. */
4271 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4272 STRIP_TYPE_NOPS (size);
4274 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4275 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4277 error ("size of array `%s' has non-integer type", name);
4278 size = integer_one_node;
4281 if (pedantic && integer_zerop (size))
4282 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4284 if (TREE_CODE (size) == INTEGER_CST)
4286 constant_expression_warning (size);
4287 if (tree_int_cst_sgn (size) < 0)
4289 error ("size of array `%s' is negative", name);
4290 size = integer_one_node;
4295 /* Make sure the array size remains visibly nonconstant
4296 even if it is (eg) a const variable with known value. */
4301 if (TREE_CONSTANT (size))
4302 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4304 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4308 /* Convert size to index_type, so that if it is a variable
4309 the computations will be done in the proper mode. */
4310 itype = fold (build (MINUS_EXPR, index_type,
4311 convert (index_type, size),
4312 convert (index_type, size_one_node)));
4315 itype = variable_size (itype);
4316 itype = build_index_type (itype);
4319 #if 0 /* This had bad results for pointers to arrays, as in
4320 union incomplete (*foo)[4]; */
4321 /* Complain about arrays of incomplete types, except in typedefs. */
4323 if (TYPE_SIZE (type) == 0
4324 /* Avoid multiple warnings for nested array types. */
4325 && TREE_CODE (type) != ARRAY_TYPE
4326 && !(specbits & (1 << (int) RID_TYPEDEF))
4327 && !C_TYPE_BEING_DEFINED (type))
4328 warning ("array type has incomplete element type");
4331 #if 0 /* We shouldn't have a function type here at all!
4332 Functions aren't allowed as array elements. */
4333 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4334 && (constp || volatilep))
4335 pedwarn ("ANSI C forbids const or volatile function types");
4338 /* Build the array type itself, then merge any constancy or
4339 volatility into the target type. We must do it in this order
4340 to ensure that the TYPE_MAIN_VARIANT field of the array type
4341 is set correctly. */
4343 type = build_array_type (type, itype);
4344 if (constp || volatilep)
4345 type = c_build_type_variant (type, constp, volatilep);
4347 #if 0 /* don't clear these; leave them set so that the array type
4348 or the variable is itself const or volatile. */
4354 C_TYPE_VARIABLE_SIZE (type) = 1;
4356 else if (TREE_CODE (declarator) == CALL_EXPR)
4358 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4359 || current_binding_level == global_binding_level);
4362 /* Declaring a function type.
4363 Make sure we have a valid type for the function to return. */
4364 if (type == error_mark_node)
4369 /* Warn about some types functions can't return. */
4371 if (TREE_CODE (type) == FUNCTION_TYPE)
4373 error ("`%s' declared as function returning a function", name);
4374 type = integer_type_node;
4376 if (TREE_CODE (type) == ARRAY_TYPE)
4378 error ("`%s' declared as function returning an array", name);
4379 type = integer_type_node;
4382 #ifndef TRADITIONAL_RETURN_FLOAT
4383 /* Traditionally, declaring return type float means double. */
4385 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4386 type = double_type_node;
4387 #endif /* TRADITIONAL_RETURN_FLOAT */
4389 /* If this is a block level extern, it must live past the end
4390 of the function so that we can check it against other extern
4391 declarations (IDENTIFIER_LIMBO_VALUE). */
4392 if (extern_ref && allocation_temporary_p ())
4393 end_temporary_allocation ();
4395 /* Construct the function type and go to the next
4396 inner layer of declarator. */
4398 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4400 /* Say it's a definition
4401 only for the CALL_EXPR
4402 closest to the identifier. */
4403 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4404 #if 0 /* This seems to be false. We turn off temporary allocation
4405 above in this function if -traditional.
4406 And this code caused inconsistent results with prototypes:
4407 callers would ignore them, and pass arguments wrong. */
4409 /* Omit the arg types if -traditional, since the arg types
4410 and the list links might not be permanent. */
4411 type = build_function_type (type,
4413 ? NULL_TREE : arg_types);
4415 /* ANSI seems to say that `const int foo ();'
4416 does not make the function foo const. */
4417 if (constp || volatilep)
4418 type = c_build_type_variant (type, constp, volatilep);
4422 type = build_function_type (type, arg_types);
4423 declarator = TREE_OPERAND (declarator, 0);
4425 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4426 the formal parameter list of this FUNCTION_TYPE to point to
4427 the FUNCTION_TYPE node itself. */
4432 for (link = current_function_parm_tags;
4434 link = TREE_CHAIN (link))
4435 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4438 else if (TREE_CODE (declarator) == INDIRECT_REF)
4440 /* Merge any constancy or volatility into the target type
4443 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4444 && (constp || volatilep))
4445 pedwarn ("ANSI C forbids const or volatile function types");
4446 if (constp || volatilep)
4447 type = c_build_type_variant (type, constp, volatilep);
4452 type = build_pointer_type (type);
4454 /* Process a list of type modifier keywords
4455 (such as const or volatile) that were given inside the `*'. */
4457 if (TREE_TYPE (declarator))
4459 register tree typemodlist;
4461 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4462 typemodlist = TREE_CHAIN (typemodlist))
4464 if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_CONST])
4466 else if (TREE_VALUE (typemodlist) == ridpointers[(int) RID_VOLATILE])
4471 error ("invalid type modifier within pointer declarator");
4475 pedwarn ("duplicate `const'");
4477 pedwarn ("duplicate `volatile'");
4480 declarator = TREE_OPERAND (declarator, 0);
4487 /* Now TYPE has the actual type. */
4489 /* If this is declaring a typedef name, return a TYPE_DECL. */
4491 if (specbits & (1 << (int) RID_TYPEDEF))
4494 /* Note that the grammar rejects storage classes
4495 in typenames, fields or parameters */
4496 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4497 && (constp || volatilep))
4498 pedwarn ("ANSI C forbids const or volatile function types");
4499 if (constp || volatilep)
4500 type = c_build_type_variant (type, constp, volatilep);
4502 decl = build_decl (TYPE_DECL, declarator, type);
4503 if ((specbits & (1 << (int) RID_SIGNED))
4504 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4505 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4509 /* Detect the case of an array type of unspecified size
4510 which came, as such, direct from a typedef name.
4511 We must copy the type, so that each identifier gets
4512 a distinct type, so that each identifier's size can be
4513 controlled separately by its own initializer. */
4515 if (type != 0 && typedef_type != 0
4516 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4517 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4519 type = build_array_type (TREE_TYPE (type), 0);
4521 C_TYPE_VARIABLE_SIZE (type) = 1;
4524 /* If this is a type name (such as, in a cast or sizeof),
4525 compute the type and return it now. */
4527 if (decl_context == TYPENAME)
4529 /* Note that the grammar rejects storage classes
4530 in typenames, fields or parameters */
4531 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4532 && (constp || volatilep))
4533 pedwarn ("ANSI C forbids const or volatile function types");
4534 if (constp || volatilep)
4535 type = c_build_type_variant (type, constp, volatilep);
4540 /* Aside from typedefs and type names (handle above),
4541 `void' at top level (not within pointer)
4542 is allowed only in public variables.
4543 We don't complain about parms either, but that is because
4544 a better error message can be made later. */
4546 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4547 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4548 && ((specbits & (1 << (int) RID_EXTERN))
4549 || (current_binding_level == global_binding_level
4551 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4553 error ("variable or field `%s' declared void",
4554 IDENTIFIER_POINTER (declarator));
4555 type = integer_type_node;
4558 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4559 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4564 if (decl_context == PARM)
4566 tree type_as_written = type;
4569 /* A parameter declared as an array of T is really a pointer to T.
4570 One declared as a function is really a pointer to a function. */
4572 if (TREE_CODE (type) == ARRAY_TYPE)
4574 /* Transfer const-ness of array into that of type pointed to. */
4575 type = TREE_TYPE (type);
4576 if (constp || volatilep)
4577 type = c_build_type_variant (type, constp, volatilep);
4578 type = build_pointer_type (type);
4579 volatilep = constp = 0;
4582 else if (TREE_CODE (type) == FUNCTION_TYPE)
4584 if (pedantic && (constp || volatilep))
4585 pedwarn ("ANSI C forbids const or volatile function types");
4586 if (constp || volatilep)
4587 type = c_build_type_variant (type, constp, volatilep);
4588 type = build_pointer_type (type);
4589 volatilep = constp = 0;
4592 decl = build_decl (PARM_DECL, declarator, type);
4594 C_DECL_VARIABLE_SIZE (decl) = 1;
4596 /* Compute the type actually passed in the parmlist,
4597 for the case where there is no prototype.
4598 (For example, shorts and chars are passed as ints.)
4599 When there is a prototype, this is overridden later. */
4601 DECL_ARG_TYPE (decl) = type;
4602 main_type = (type == error_mark_node
4604 : TYPE_MAIN_VARIANT (type));
4605 if (main_type == float_type_node)
4606 DECL_ARG_TYPE (decl) = double_type_node;
4607 /* Don't use TYPE_PRECISION to decide whether to promote,
4608 because we should convert short if it's the same size as int,
4609 but we should not convert long if it's the same size as int. */
4610 else if (TREE_CODE (main_type) != ERROR_MARK
4611 && C_PROMOTING_INTEGER_TYPE_P (main_type))
4613 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
4614 && TREE_UNSIGNED (type))
4615 DECL_ARG_TYPE (decl) = unsigned_type_node;
4617 DECL_ARG_TYPE (decl) = integer_type_node;
4620 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4622 else if (decl_context == FIELD)
4624 /* Structure field. It may not be a function. */
4626 if (TREE_CODE (type) == FUNCTION_TYPE)
4628 error ("field `%s' declared as a function",
4629 IDENTIFIER_POINTER (declarator));
4630 type = build_pointer_type (type);
4632 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4634 error ("field `%s' has incomplete type",
4635 IDENTIFIER_POINTER (declarator));
4636 type = error_mark_node;
4638 /* Move type qualifiers down to element of an array. */
4639 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4641 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4643 TYPE_DOMAIN (type));
4644 #if 0 /* Leave the field const or volatile as well. */
4645 constp = volatilep = 0;
4648 decl = build_decl (FIELD_DECL, declarator, type);
4650 C_DECL_VARIABLE_SIZE (decl) = 1;
4652 else if (TREE_CODE (type) == FUNCTION_TYPE)
4654 /* Every function declaration is "external"
4655 except for those which are inside a function body
4656 in which `auto' is used.
4657 That is a case not specified by ANSI C,
4658 and we use it for forward declarations for nested functions. */
4659 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4660 || current_binding_level == global_binding_level);
4662 if (specbits & (1 << (int) RID_AUTO)
4663 && (pedantic || current_binding_level == global_binding_level))
4664 pedwarn ("invalid storage class for function `%s'",
4665 IDENTIFIER_POINTER (declarator));
4666 if (specbits & (1 << (int) RID_REGISTER))
4667 error ("invalid storage class for function `%s'",
4668 IDENTIFIER_POINTER (declarator));
4669 /* Function declaration not at top level.
4670 Storage classes other than `extern' are not allowed
4671 and `extern' makes no difference. */
4672 if (current_binding_level != global_binding_level
4673 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4675 pedwarn ("invalid storage class for function `%s'",
4676 IDENTIFIER_POINTER (declarator));
4678 /* If this is a block level extern, it must live past the end
4679 of the function so that we can check it against other
4680 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4681 if (extern_ref && allocation_temporary_p ())
4682 end_temporary_allocation ();
4684 decl = build_decl (FUNCTION_DECL, declarator, type);
4686 if (pedantic && (constp || volatilep)
4687 && ! DECL_IN_SYSTEM_HEADER (decl))
4688 pedwarn ("ANSI C forbids const or volatile functions");
4691 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4692 warning ("`noreturn' function returns non-void value");
4695 DECL_EXTERNAL (decl) = 1;
4696 /* Record absence of global scope for `static' or `auto'. */
4698 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4699 /* Record presence of `inline', if it is reasonable. */
4702 tree last = tree_last (TYPE_ARG_TYPES (type));
4704 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4705 warning ("cannot inline function `main'");
4706 else if (last && (TYPE_MAIN_VARIANT (TREE_VALUE (last))
4708 warning ("inline declaration ignored for function with `...'");
4710 /* Assume that otherwise the function can be inlined. */
4711 DECL_INLINE (decl) = 1;
4713 if (specbits & (1 << (int) RID_EXTERN))
4714 current_extern_inline = 1;
4719 /* It's a variable. */
4720 /* An uninitialized decl with `extern' is a reference. */
4721 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4723 /* Move type qualifiers down to element of an array. */
4724 if (TREE_CODE (type) == ARRAY_TYPE && (constp || volatilep))
4726 type = build_array_type (c_build_type_variant (TREE_TYPE (type),
4728 TYPE_DOMAIN (type));
4729 #if 0 /* Leave the variable const or volatile as well. */
4730 constp = volatilep = 0;
4734 /* If this is a block level extern, it must live past the end
4735 of the function so that we can check it against other
4736 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4737 if (extern_ref && allocation_temporary_p ())
4738 end_temporary_allocation ();
4740 decl = build_decl (VAR_DECL, declarator, type);
4742 C_DECL_VARIABLE_SIZE (decl) = 1;
4745 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
4747 DECL_EXTERNAL (decl) = extern_ref;
4748 /* At top level, the presence of a `static' or `register' storage
4749 class specifier, or the absence of all storage class specifiers
4750 makes this declaration a definition (perhaps tentative). Also,
4751 the absence of both `static' and `register' makes it public. */
4752 if (current_binding_level == global_binding_level)
4756 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
4757 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
4759 /* Not at top level, only `static' makes a static definition. */
4762 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
4763 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
4766 if (specbits & 1 << (int) RID_ITERATOR)
4767 ITERATOR_P (decl) = 1;
4770 /* Record `register' declaration for warnings on &
4771 and in case doing stupid register allocation. */
4773 if (specbits & (1 << (int) RID_REGISTER))
4774 DECL_REGISTER (decl) = 1;
4776 /* Record constancy and volatility. */
4779 TREE_READONLY (decl) = 1;
4782 TREE_SIDE_EFFECTS (decl) = 1;
4783 TREE_THIS_VOLATILE (decl) = 1;
4785 /* If a type has volatile components, it should be stored in memory.
4786 Otherwise, the fact that those components are volatile
4787 will be ignored, and would even crash the compiler. */
4788 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
4789 mark_addressable (decl);
4797 /* Decode the parameter-list info for a function type or function definition.
4798 The argument is the value returned by `get_parm_info' (or made in parse.y
4799 if there is an identifier list instead of a parameter decl list).
4800 These two functions are separate because when a function returns
4801 or receives functions then each is called multiple times but the order
4802 of calls is different. The last call to `grokparms' is always the one
4803 that contains the formal parameter names of a function definition.
4805 Store in `last_function_parms' a chain of the decls of parms.
4806 Also store in `last_function_parm_tags' a chain of the struct, union,
4807 and enum tags declared among the parms.
4809 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4811 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4812 a mere declaration. A nonempty identifier-list gets an error message
4813 when FUNCDEF_FLAG is zero. */
4816 grokparms (parms_info, funcdef_flag)
4820 tree first_parm = TREE_CHAIN (parms_info);
4822 last_function_parms = TREE_PURPOSE (parms_info);
4823 last_function_parm_tags = TREE_VALUE (parms_info);
4825 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
4826 && !in_system_header)
4827 warning ("function declaration isn't a prototype");
4830 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
4833 pedwarn ("parameter names (without types) in function declaration");
4835 last_function_parms = first_parm;
4842 /* We no longer test FUNCDEF_FLAG.
4843 If the arg types are incomplete in a declaration,
4844 they must include undefined tags.
4845 These tags can never be defined in the scope of the declaration,
4846 so the types can never be completed,
4847 and no call can be compiled successfully. */
4849 /* In a fcn definition, arg types must be complete. */
4852 for (parm = last_function_parms, typelt = first_parm;
4854 parm = TREE_CHAIN (parm))
4855 /* Skip over any enumeration constants declared here. */
4856 if (TREE_CODE (parm) == PARM_DECL)
4858 /* Barf if the parameter itself has an incomplete type. */
4859 tree type = TREE_VALUE (typelt);
4860 if (TYPE_SIZE (type) == 0)
4862 if (funcdef_flag && DECL_NAME (parm) != 0)
4863 error ("parameter `%s' has incomplete type",
4864 IDENTIFIER_POINTER (DECL_NAME (parm)));
4866 warning ("parameter has incomplete type");
4869 TREE_VALUE (typelt) = error_mark_node;
4870 TREE_TYPE (parm) = error_mark_node;
4873 #if 0 /* This has been replaced by parm_tags_warning
4874 which uses a more accurate criterion for what to warn about. */
4877 /* Now warn if is a pointer to an incomplete type. */
4878 while (TREE_CODE (type) == POINTER_TYPE
4879 || TREE_CODE (type) == REFERENCE_TYPE)
4880 type = TREE_TYPE (type);
4881 type = TYPE_MAIN_VARIANT (type);
4882 if (TYPE_SIZE (type) == 0)
4884 if (DECL_NAME (parm) != 0)
4885 warning ("parameter `%s' points to incomplete type",
4886 IDENTIFIER_POINTER (DECL_NAME (parm)));
4888 warning ("parameter points to incomplete type");
4892 typelt = TREE_CHAIN (typelt);
4895 /* Allocate the list of types the way we allocate a type. */
4896 if (first_parm && ! TREE_PERMANENT (first_parm))
4898 /* Construct a copy of the list of types
4899 on the saveable obstack. */
4901 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
4902 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
4904 return nreverse (result);
4907 /* The list we have is permanent already. */
4913 /* Return a tree_list node with info on a parameter list just parsed.
4914 The TREE_PURPOSE is a chain of decls of those parms.
4915 The TREE_VALUE is a list of structure, union and enum tags defined.
4916 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4917 This tree_list node is later fed to `grokparms'.
4919 VOID_AT_END nonzero means append `void' to the end of the type-list.
4920 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4923 get_parm_info (void_at_end)
4926 register tree decl, t;
4927 register tree types = 0;
4929 tree tags = gettags ();
4930 tree parms = getdecls ();
4932 tree order = current_binding_level->parm_order;
4934 /* Just `void' (and no ellipsis) is special. There are really no parms. */
4935 if (void_at_end && parms != 0
4936 && TREE_CHAIN (parms) == 0
4937 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
4938 && DECL_NAME (parms) == 0)
4941 storedecls (NULL_TREE);
4942 return saveable_tree_cons (NULL_TREE, NULL_TREE,
4943 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
4946 /* Extract enumerator values and other non-parms declared with the parms.
4947 Likewise any forward parm decls that didn't have real parm decls. */
4948 for (decl = parms; decl; )
4950 tree next = TREE_CHAIN (decl);
4952 if (TREE_CODE (decl) != PARM_DECL)
4954 TREE_CHAIN (decl) = new_parms;
4957 else if (TREE_ASM_WRITTEN (decl))
4959 error_with_decl (decl, "parameter `%s' has just a forward declaration");
4960 TREE_CHAIN (decl) = new_parms;
4966 /* Put the parm decls back in the order they were in in the parm list. */
4967 for (t = order; t; t = TREE_CHAIN (t))
4970 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
4972 TREE_CHAIN (TREE_VALUE (t)) = 0;
4975 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
4978 /* Store the parmlist in the binding level since the old one
4979 is no longer a valid list. (We have changed the chain pointers.) */
4980 storedecls (new_parms);
4982 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
4983 /* There may also be declarations for enumerators if an enumeration
4984 type is declared among the parms. Ignore them here. */
4985 if (TREE_CODE (decl) == PARM_DECL)
4987 /* Since there is a prototype,
4988 args are passed in their declared types. */
4989 tree type = TREE_TYPE (decl);
4990 DECL_ARG_TYPE (decl) = type;
4991 #ifdef PROMOTE_PROTOTYPES
4992 if ((TREE_CODE (type) == INTEGER_TYPE
4993 || TREE_CODE (type) == ENUMERAL_TYPE)
4994 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
4995 DECL_ARG_TYPE (decl) = integer_type_node;
4998 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
4999 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5000 && DECL_NAME (decl) == 0)
5002 error ("`void' in parameter list must be the entire list");
5008 return saveable_tree_cons (new_parms, tags,
5009 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5011 return saveable_tree_cons (new_parms, tags, nreverse (types));
5014 /* At end of parameter list, warn about any struct, union or enum tags
5015 defined within. Do so because these types cannot ever become complete. */
5018 parmlist_tags_warning ()
5023 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5025 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5026 /* An anonymous union parm type is meaningful as a GNU extension.
5027 So don't warn for that. */
5028 if (code == UNION_TYPE && !pedantic)
5030 if (TREE_PURPOSE (elt) != 0)
5031 warning ("`%s %s' declared inside parameter list",
5032 (code == RECORD_TYPE ? "struct"
5033 : code == UNION_TYPE ? "union"
5035 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5037 warning ("anonymous %s declared inside parameter list",
5038 (code == RECORD_TYPE ? "struct"
5039 : code == UNION_TYPE ? "union"
5044 warning ("its scope is only this definition or declaration,");
5045 warning ("which is probably not what you want.");
5051 /* Get the struct, enum or union (CODE says which) with tag NAME.
5052 Define the tag as a forward-reference if it is not defined. */
5055 xref_tag (code, name)
5056 enum tree_code code;
5059 int temporary = allocation_temporary_p ();
5061 /* If a cross reference is requested, look up the type
5062 already defined for this tag and return it. */
5064 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5065 /* Even if this is the wrong type of tag, return what we found.
5066 There will be an error message anyway, from pending_xref_error.
5067 If we create an empty xref just for an invalid use of the type,
5068 the main result is to create lots of superfluous error messages. */
5072 push_obstacks_nochange ();
5074 if (current_binding_level == global_binding_level && temporary)
5075 end_temporary_allocation ();
5077 /* If no such tag is yet defined, create a forward-reference node
5078 and record it as the "definition".
5079 When a real declaration of this type is found,
5080 the forward-reference will be altered into a real type. */
5082 ref = make_node (code);
5083 if (code == ENUMERAL_TYPE)
5085 /* (In ANSI, Enums can be referred to only if already defined.) */
5087 pedwarn ("ANSI C forbids forward references to `enum' types");
5088 /* Give the type a default layout like unsigned int
5089 to avoid crashing if it does not get defined. */
5090 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5091 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5092 TREE_UNSIGNED (ref) = 1;
5093 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5094 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5095 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5098 pushtag (name, ref);
5105 /* Make sure that the tag NAME is defined *in the current binding level*
5106 at least as a forward reference.
5107 CODE says which kind of tag NAME ought to be.
5109 We also do a push_obstacks_nochange
5110 whose matching pop is in finish_struct. */
5113 start_struct (code, name)
5114 enum tree_code code;
5117 /* If there is already a tag defined at this binding level
5118 (as a forward reference), just return it. */
5120 register tree ref = 0;
5122 push_obstacks_nochange ();
5123 if (current_binding_level == global_binding_level)
5124 end_temporary_allocation ();
5127 ref = lookup_tag (code, name, current_binding_level, 1);
5128 if (ref && TREE_CODE (ref) == code)
5130 C_TYPE_BEING_DEFINED (ref) = 1;
5131 if (TYPE_FIELDS (ref))
5132 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5133 : "redefinition of `struct %s'"),
5134 IDENTIFIER_POINTER (name));
5139 /* Otherwise create a forward-reference just so the tag is in scope. */
5141 ref = make_node (code);
5142 pushtag (name, ref);
5143 C_TYPE_BEING_DEFINED (ref) = 1;
5147 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5148 of a structure component, returning a FIELD_DECL node.
5149 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5151 This is done during the parsing of the struct declaration.
5152 The FIELD_DECL nodes are chained together and the lot of them
5153 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5156 grokfield (filename, line, declarator, declspecs, width)
5159 tree declarator, declspecs, width;
5163 /* The corresponding pop_obstacks is in finish_decl. */
5164 push_obstacks_nochange ();
5166 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5168 finish_decl (value, NULL_TREE, NULL_TREE);
5169 DECL_INITIAL (value) = width;
5171 maybe_objc_check_decl (value);
5175 /* Function to help qsort sort FIELD_DECLs by name order. */
5178 field_decl_cmp (x, y)
5181 return (long)DECL_NAME (*x) - (long)DECL_NAME (*y);
5184 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5185 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5187 We also do a pop_obstacks to match the push in start_struct. */
5190 finish_struct (t, fieldlist)
5191 register tree t, fieldlist;
5195 int toplevel = global_binding_level == current_binding_level;
5197 /* If this type was previously laid out as a forward reference,
5198 make sure we lay it out again. */
5202 /* Nameless union parm types are useful as GCC extension. */
5203 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5204 /* Otherwise, warn about any struct or union def. in parmlist. */
5205 if (in_parm_level_p ())
5208 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5209 : "structure defined inside parms"));
5210 else if (! flag_traditional)
5211 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5212 : "structure defined inside parms"));
5215 old_momentary = suspend_momentary ();
5217 if (fieldlist == 0 && pedantic)
5218 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union has no members"
5219 : "structure has no members"));
5221 /* Install struct as DECL_CONTEXT of each field decl.
5222 Also process specified field sizes.
5223 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5224 The specified size is found in the DECL_INITIAL.
5225 Store 0 there, except for ": 0" fields (so we can find them
5226 and delete them, below). */
5228 for (x = fieldlist; x; x = TREE_CHAIN (x))
5230 DECL_CONTEXT (x) = t;
5231 DECL_FIELD_SIZE (x) = 0;
5233 /* If any field is const, the structure type is pseudo-const. */
5234 if (TREE_READONLY (x))
5235 C_TYPE_FIELDS_READONLY (t) = 1;
5238 /* A field that is pseudo-const makes the structure likewise. */
5239 tree t1 = TREE_TYPE (x);
5240 while (TREE_CODE (t1) == ARRAY_TYPE)
5241 t1 = TREE_TYPE (t1);
5242 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5243 && C_TYPE_FIELDS_READONLY (t1))
5244 C_TYPE_FIELDS_READONLY (t) = 1;
5247 /* Any field that is volatile means variables of this type must be
5248 treated in some ways as volatile. */
5249 if (TREE_THIS_VOLATILE (x))
5250 C_TYPE_FIELDS_VOLATILE (t) = 1;
5252 /* Any field of nominal variable size implies structure is too. */
5253 if (C_DECL_VARIABLE_SIZE (x))
5254 C_TYPE_VARIABLE_SIZE (t) = 1;
5256 /* Detect invalid nested redefinition. */
5257 if (TREE_TYPE (x) == t)
5258 error ("nested redefinition of `%s'",
5259 IDENTIFIER_POINTER (TYPE_NAME (t)));
5261 /* Detect invalid bit-field size. */
5262 if (DECL_INITIAL (x))
5263 STRIP_NOPS (DECL_INITIAL (x));
5264 if (DECL_INITIAL (x))
5266 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5267 constant_expression_warning (DECL_INITIAL (x));
5270 error_with_decl (x, "bit-field `%s' width not an integer constant");
5271 DECL_INITIAL (x) = NULL;
5275 /* Detect invalid bit-field type. */
5276 if (DECL_INITIAL (x)
5277 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5278 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5280 error_with_decl (x, "bit-field `%s' has invalid type");
5281 DECL_INITIAL (x) = NULL;
5283 if (DECL_INITIAL (x) && pedantic
5284 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5285 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5286 /* Accept an enum that's equivalent to int or unsigned int. */
5287 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5288 && (TYPE_PRECISION (TREE_TYPE (x))
5289 == TYPE_PRECISION (integer_type_node))))
5290 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5292 /* Detect and ignore out of range field width. */
5293 if (DECL_INITIAL (x))
5295 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5297 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5299 DECL_INITIAL (x) = NULL;
5300 error_with_decl (x, "negative width in bit-field `%s'");
5302 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5303 || width > TYPE_PRECISION (TREE_TYPE (x)))
5305 DECL_INITIAL (x) = NULL;
5306 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5308 else if (width == 0 && DECL_NAME (x) != 0)
5310 error_with_decl (x, "zero width for bit-field `%s'");
5311 DECL_INITIAL (x) = NULL;
5315 /* Process valid field width. */
5316 if (DECL_INITIAL (x))
5318 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5320 DECL_FIELD_SIZE (x) = width;
5321 DECL_BIT_FIELD (x) = 1;
5322 DECL_INITIAL (x) = NULL;
5326 /* field size 0 => force desired amount of alignment. */
5327 #ifdef EMPTY_FIELD_BOUNDARY
5328 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5330 #ifdef PCC_BITFIELD_TYPE_MATTERS
5331 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5332 TYPE_ALIGN (TREE_TYPE (x)));
5338 int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5339 : TYPE_ALIGN (TREE_TYPE (x)));
5340 /* Non-bit-fields are aligned for their type, except packed
5341 fields which require only BITS_PER_UNIT alignment. */
5342 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5346 /* Now DECL_INITIAL is null on all members. */
5348 /* Delete all duplicate fields from the fieldlist */
5349 for (x = fieldlist; x && TREE_CHAIN (x);)
5350 /* Anonymous fields aren't duplicates. */
5351 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5355 register tree y = fieldlist;
5359 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5365 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5367 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5368 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5370 else x = TREE_CHAIN (x);
5373 /* Now we have the nearly final fieldlist. Record it,
5374 then lay out the structure or union (including the fields). */
5376 TYPE_FIELDS (t) = fieldlist;
5380 /* Delete all zero-width bit-fields from the front of the fieldlist */
5382 && DECL_INITIAL (fieldlist))
5383 fieldlist = TREE_CHAIN (fieldlist);
5384 /* Delete all such members from the rest of the fieldlist */
5385 for (x = fieldlist; x;)
5387 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5388 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5389 else x = TREE_CHAIN (x);
5392 /* Now we have the truly final field list.
5393 Store it in this type and in the variants. */
5395 TYPE_FIELDS (t) = fieldlist;
5397 /* If there are lots of fields, sort so we can look through them fast.
5398 We arbitrarily consider 16 or more elts to be "a lot". */
5402 for (x = fieldlist; x; x = TREE_CHAIN (x))
5413 len += list_length (x);
5414 /* Use the same allocation policy here that make_node uses, to
5415 ensure that this lives as long as the rest of the struct decl.
5416 All decls in an inline function need to be saved. */
5417 if (allocation_temporary_p ())
5418 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5420 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5422 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5423 TYPE_LANG_SPECIFIC (t)->len = len;
5425 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5427 for (x = fieldlist; x; x = TREE_CHAIN (x))
5428 field_array[len++] = x;
5430 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5434 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5436 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5437 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5438 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5441 /* Promote each bit-field's type to int if it is narrower than that. */
5442 for (x = fieldlist; x; x = TREE_CHAIN (x))
5443 if (DECL_BIT_FIELD (x)
5444 && (C_PROMOTING_INTEGER_TYPE_P (TREE_TYPE (x))
5445 || DECL_FIELD_SIZE (x) < TYPE_PRECISION (integer_type_node)))
5447 tree type = TREE_TYPE (x);
5449 /* Preserve unsignedness if traditional
5450 or if not really getting any wider. */
5451 if (TREE_UNSIGNED (type)
5452 && (flag_traditional
5454 (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5456 DECL_FIELD_SIZE (x) == TYPE_PRECISION (integer_type_node))))
5457 TREE_TYPE (x) = unsigned_type_node;
5459 TREE_TYPE (x) = integer_type_node;
5462 /* If this structure or union completes the type of any previous
5463 variable declaration, lay it out and output its rtl. */
5465 if (current_binding_level->n_incomplete != 0)
5468 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5470 if (TREE_TYPE (decl) == t
5471 && TREE_CODE (decl) != TYPE_DECL)
5473 layout_decl (decl, 0);
5474 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5475 maybe_objc_check_decl (decl);
5476 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5479 --current_binding_level->n_incomplete;
5481 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5482 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5484 tree element = TREE_TYPE (decl);
5485 while (TREE_CODE (element) == ARRAY_TYPE)
5486 element = TREE_TYPE (element);
5488 layout_array_type (TREE_TYPE (decl));
5493 resume_momentary (old_momentary);
5495 /* Finish debugging output for this type. */
5496 rest_of_type_compilation (t, toplevel);
5498 /* The matching push is in start_struct. */
5504 /* Lay out the type T, and its element type, and so on. */
5507 layout_array_type (t)
5510 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5511 layout_array_type (TREE_TYPE (t));
5515 /* Begin compiling the definition of an enumeration type.
5516 NAME is its name (or null if anonymous).
5517 Returns the type object, as yet incomplete.
5518 Also records info about it so that build_enumerator
5519 may be used to declare the individual values as they are read. */
5525 register tree enumtype = 0;
5527 /* If this is the real definition for a previous forward reference,
5528 fill in the contents in the same object that used to be the
5529 forward reference. */
5532 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5534 /* The corresponding pop_obstacks is in finish_enum. */
5535 push_obstacks_nochange ();
5536 /* If these symbols and types are global, make them permanent. */
5537 if (current_binding_level == global_binding_level)
5538 end_temporary_allocation ();
5540 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5542 enumtype = make_node (ENUMERAL_TYPE);
5543 pushtag (name, enumtype);
5546 C_TYPE_BEING_DEFINED (enumtype) = 1;
5548 if (TYPE_VALUES (enumtype) != 0)
5550 /* This enum is a named one that has been declared already. */
5551 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5553 /* Completely replace its old definition.
5554 The old enumerators remain defined, however. */
5555 TYPE_VALUES (enumtype) = 0;
5558 enum_next_value = integer_zero_node;
5564 /* After processing and defining all the values of an enumeration type,
5565 install their decls in the enumeration type and finish it off.
5566 ENUMTYPE is the type object and VALUES a list of decl-value pairs.
5567 Returns ENUMTYPE. */
5570 finish_enum (enumtype, values)
5571 register tree enumtype, values;
5573 register tree pair, tem;
5574 tree minnode = 0, maxnode = 0;
5575 register HOST_WIDE_INT maxvalue = 0;
5576 register HOST_WIDE_INT minvalue = 0;
5577 unsigned precision = 0;
5578 int toplevel = global_binding_level == current_binding_level;
5580 if (in_parm_level_p ())
5581 warning ("enum defined inside parms");
5583 /* Calculate the maximum value of any enumerator in this type. */
5585 for (pair = values; pair; pair = TREE_CHAIN (pair))
5587 tree value = TREE_VALUE (pair);
5589 minnode = maxnode = TREE_VALUE (pair);
5592 if (tree_int_cst_lt (maxnode, value))
5594 if (tree_int_cst_lt (value, minnode))
5599 TYPE_MIN_VALUE (enumtype) = minnode;
5600 TYPE_MAX_VALUE (enumtype) = maxnode;
5602 /* Determine the precision this type needs. */
5604 if (TREE_INT_CST_HIGH (minnode) >= 0
5605 ? tree_int_cst_lt (TYPE_MAX_VALUE (unsigned_type_node), maxnode)
5606 : (tree_int_cst_lt (minnode, TYPE_MIN_VALUE (integer_type_node))
5607 || tree_int_cst_lt (TYPE_MAX_VALUE (integer_type_node), maxnode)))
5608 precision = TYPE_PRECISION (long_long_integer_type_node);
5611 maxvalue = TREE_INT_CST_LOW (maxnode);
5612 minvalue = TREE_INT_CST_LOW (minnode);
5615 precision = floor_log2 (maxvalue) + 1;
5618 /* Compute number of bits to represent magnitude of a negative value.
5619 Add one to MINVALUE since range of negative numbers
5620 includes the power of two. */
5621 unsigned negprecision = floor_log2 (-minvalue - 1) + 1;
5622 if (negprecision > precision)
5623 precision = negprecision;
5624 precision += 1; /* room for sign bit */
5631 if (flag_short_enums || precision > TYPE_PRECISION (integer_type_node))
5632 /* Use the width of the narrowest normal C type which is wide enough. */
5633 TYPE_PRECISION (enumtype) = TYPE_PRECISION (type_for_size (precision, 1));
5635 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5637 TYPE_SIZE (enumtype) = 0;
5638 layout_type (enumtype);
5640 /* An enum can have some negative values; then it is signed. */
5641 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5643 /* Change the type of the enumerators to be the enum type.
5644 Formerly this was done only for enums that fit in an int,
5645 but the comment said it was done only for enums wider than int.
5646 It seems necessary to do this for wide enums,
5647 and best not to change what's done for ordinary narrower ones. */
5648 for (pair = values; pair; pair = TREE_CHAIN (pair))
5650 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5651 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5652 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5653 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5656 /* Replace the decl nodes in VALUES with their names. */
5657 for (pair = values; pair; pair = TREE_CHAIN (pair))
5658 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5660 TYPE_VALUES (enumtype) = values;
5662 /* Fix up all variant types of this enum type. */
5663 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5665 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5666 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5667 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5668 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5669 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5670 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5671 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5672 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5675 /* Finish debugging output for this type. */
5676 rest_of_type_compilation (enumtype, toplevel);
5678 /* This matches a push in start_enum. */
5684 /* Build and install a CONST_DECL for one value of the
5685 current enumeration type (one that was begun with start_enum).
5686 Return a tree-list containing the CONST_DECL and its value.
5687 Assignment of sequential values by default is handled here. */
5690 build_enumerator (name, value)
5693 register tree decl, type;
5695 /* Validate and default VALUE. */
5697 /* Remove no-op casts from the value. */
5699 STRIP_TYPE_NOPS (value);
5703 if (TREE_CODE (value) == INTEGER_CST)
5705 value = default_conversion (value);
5706 constant_expression_warning (value);
5710 error ("enumerator value for `%s' not integer constant",
5711 IDENTIFIER_POINTER (name));
5716 /* Default based on previous value. */
5717 /* It should no longer be possible to have NON_LVALUE_EXPR
5721 value = enum_next_value;
5723 error ("overflow in enumeration values");
5726 if (pedantic && ! int_fits_type_p (value, integer_type_node))
5728 pedwarn ("ANSI C restricts enumerator values to range of `int'");
5729 value = integer_zero_node;
5732 /* Set basis for default for next value. */
5733 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
5734 enum_overflow = tree_int_cst_lt (enum_next_value, value);
5736 /* Now create a declaration for the enum value name. */
5738 type = TREE_TYPE (value);
5739 type = type_for_size (MAX (TYPE_PRECISION (type),
5740 TYPE_PRECISION (integer_type_node)),
5742 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
5743 && TREE_UNSIGNED (type)));
5745 decl = build_decl (CONST_DECL, name, type);
5746 DECL_INITIAL (decl) = value;
5747 TREE_TYPE (value) = type;
5750 return saveable_tree_cons (decl, value, NULL_TREE);
5753 /* Create the FUNCTION_DECL for a function definition.
5754 DECLSPECS and DECLARATOR are the parts of the declaration;
5755 they describe the function's name and the type it returns,
5756 but twisted together in a fashion that parallels the syntax of C.
5758 This function creates a binding context for the function body
5759 as well as setting up the FUNCTION_DECL in current_function_decl.
5761 Returns 1 on success. If the DECLARATOR is not suitable for a function
5762 (it defines a datum instead), we return 0, which tells
5763 yyparse to report a parse error.
5765 NESTED is nonzero for a function nested within another function. */
5768 start_function (declspecs, declarator, nested)
5769 tree declarator, declspecs;
5772 tree decl1, old_decl;
5775 current_function_returns_value = 0; /* Assume, until we see it does. */
5776 current_function_returns_null = 0;
5777 warn_about_return_type = 0;
5778 current_extern_inline = 0;
5779 c_function_varargs = 0;
5781 shadowed_labels = 0;
5783 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
5785 /* If the declarator is not suitable for a function definition,
5786 cause a syntax error. */
5790 announce_function (decl1);
5792 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
5794 error ("return-type is an incomplete type");
5795 /* Make it return void instead. */
5797 = build_function_type (void_type_node,
5798 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
5801 if (warn_about_return_type)
5802 warning ("return-type defaults to `int'");
5804 /* Save the parm names or decls from this function's declarator
5805 where store_parm_decls will find them. */
5806 current_function_parms = last_function_parms;
5807 current_function_parm_tags = last_function_parm_tags;
5809 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5810 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5811 DECL_INITIAL (decl1) = error_mark_node;
5813 /* If this definition isn't a prototype and we had a prototype declaration
5814 before, copy the arg type info from that prototype.
5815 But not if what we had before was a builtin function. */
5816 old_decl = lookup_name_current_level (DECL_NAME (decl1));
5817 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
5818 && !DECL_BUILT_IN (old_decl)
5819 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
5820 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
5821 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
5823 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
5824 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
5825 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
5828 /* Optionally warn of old-fashioned def with no previous prototype. */
5829 if (warn_strict_prototypes
5830 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
5831 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5832 warning ("function declaration isn't a prototype");
5833 /* Optionally warn of any global def with no previous prototype. */
5834 else if (warn_missing_prototypes
5835 && TREE_PUBLIC (decl1)
5836 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
5837 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5838 warning_with_decl (decl1, "no previous prototype for `%s'");
5839 /* Optionally warn of any def with no previous prototype
5840 if the function has already been used. */
5841 else if (warn_missing_prototypes
5842 && old_decl != 0 && TREE_USED (old_decl)
5843 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
5844 warning_with_decl (decl1,
5845 "`%s' was used with no prototype before its definition");
5846 /* Optionally warn of any global def with no previous declaration. */
5847 else if (warn_missing_declarations
5848 && TREE_PUBLIC (decl1)
5850 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
5851 warning_with_decl (decl1, "no previous declaration for `%s'");
5852 /* Optionally warn of any def with no previous declaration
5853 if the function has already been used. */
5854 else if (warn_missing_declarations
5855 && old_decl != 0 && TREE_USED (old_decl))
5856 warning_with_decl (decl1,
5857 "`%s' was used with no declaration before its definition");
5859 /* This is a definition, not a reference.
5860 So normally clear DECL_EXTERNAL.
5861 However, `extern inline' acts like a declaration
5862 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5863 DECL_EXTERNAL (decl1) = current_extern_inline;
5865 /* This function exists in static storage.
5866 (This does not mean `static' in the C sense!) */
5867 TREE_STATIC (decl1) = 1;
5869 /* A nested function is not global. */
5870 if (current_function_decl != 0)
5871 TREE_PUBLIC (decl1) = 0;
5873 /* Record the decl so that the function name is defined.
5874 If we already have a decl for this name, and it is a FUNCTION_DECL,
5875 use the old decl. */
5877 current_function_decl = pushdecl (decl1);
5880 declare_parm_level (1);
5881 current_binding_level->subblocks_tag_transparent = 1;
5883 make_function_rtl (current_function_decl);
5885 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
5886 /* Promote the value to int before returning it. */
5887 if (C_PROMOTING_INTEGER_TYPE_P (restype))
5889 /* It retains unsignedness if traditional
5890 or if not really getting wider. */
5891 if (TREE_UNSIGNED (restype)
5892 && (flag_traditional
5893 || (TYPE_PRECISION (restype)
5894 == TYPE_PRECISION (integer_type_node))))
5895 restype = unsigned_type_node;
5897 restype = integer_type_node;
5899 DECL_RESULT (current_function_decl)
5900 = build_decl (RESULT_DECL, NULL_TREE, restype);
5903 /* Allocate further tree nodes temporarily during compilation
5904 of this function only. */
5905 temporary_allocation ();
5907 /* If this fcn was already referenced via a block-scope `extern' decl
5908 (or an implicit decl), propagate certain information about the usage. */
5909 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
5910 TREE_ADDRESSABLE (current_function_decl) = 1;
5915 /* Record that this function is going to be a varargs function.
5916 This is called before store_parm_decls, which is too early
5917 to call mark_varargs directly. */
5922 c_function_varargs = 1;
5925 /* Store the parameter declarations into the current function declaration.
5926 This is called after parsing the parameter declarations, before
5927 digesting the body of the function.
5929 For an old-style definition, modify the function's type
5930 to specify at least the number of arguments. */
5935 register tree fndecl = current_function_decl;
5938 /* This is either a chain of PARM_DECLs (if a prototype was used)
5939 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
5940 tree specparms = current_function_parms;
5942 /* This is a list of types declared among parms in a prototype. */
5943 tree parmtags = current_function_parm_tags;
5945 /* This is a chain of PARM_DECLs from old-style parm declarations. */
5946 register tree parmdecls = getdecls ();
5948 /* This is a chain of any other decls that came in among the parm
5949 declarations. If a parm is declared with enum {foo, bar} x;
5950 then CONST_DECLs for foo and bar are put here. */
5953 /* Nonzero if this definition is written with a prototype. */
5956 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
5958 /* This case is when the function was defined with an ANSI prototype.
5959 The parms already have decls, so we need not do anything here
5960 except record them as in effect
5961 and complain if any redundant old-style parm decls were written. */
5972 error_with_decl (fndecl,
5973 "parm types given both in parmlist and separately");
5974 /* Get rid of the erroneous decls; don't keep them on
5975 the list of parms, since they might not be PARM_DECLs. */
5976 for (decl = current_binding_level->names;
5977 decl; decl = TREE_CHAIN (decl))
5978 if (DECL_NAME (decl))
5979 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
5980 for (link = current_binding_level->shadowed;
5981 link; link = TREE_CHAIN (link))
5982 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
5983 current_binding_level->names = 0;
5984 current_binding_level->shadowed = 0;
5987 specparms = nreverse (specparms);
5988 for (parm = specparms; parm; parm = next)
5990 next = TREE_CHAIN (parm);
5991 if (TREE_CODE (parm) == PARM_DECL)
5993 if (DECL_NAME (parm) == 0)
5994 error_with_decl (parm, "parameter name omitted");
5995 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
5997 error_with_decl (parm, "parameter `%s' declared void");
5998 /* Change the type to error_mark_node so this parameter
5999 will be ignored by assign_parms. */
6000 TREE_TYPE (parm) = error_mark_node;
6006 /* If we find an enum constant or a type tag,
6007 put it aside for the moment. */
6008 TREE_CHAIN (parm) = 0;
6009 others = chainon (others, parm);
6013 /* Get the decls in their original chain order
6014 and record in the function. */
6015 DECL_ARGUMENTS (fndecl) = getdecls ();
6018 /* If this function takes a variable number of arguments,
6019 add a phony parameter to the end of the parm list,
6020 to represent the position of the first unnamed argument. */
6021 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6024 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6025 /* Let's hope the address of the unnamed parm
6026 won't depend on its type. */
6027 TREE_TYPE (dummy) = integer_type_node;
6028 DECL_ARG_TYPE (dummy) = integer_type_node;
6029 DECL_ARGUMENTS (fndecl)
6030 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6034 /* Now pushdecl the enum constants. */
6035 for (parm = others; parm; parm = next)
6037 next = TREE_CHAIN (parm);
6038 if (DECL_NAME (parm) == 0)
6040 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6042 else if (TREE_CODE (parm) != PARM_DECL)
6046 storetags (chainon (parmtags, gettags ()));
6050 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6051 each with a parm name as the TREE_VALUE.
6053 PARMDECLS is a chain of declarations for parameters.
6054 Warning! It can also contain CONST_DECLs which are not parameters
6055 but are names of enumerators of any enum types
6056 declared among the parameters.
6058 First match each formal parameter name with its declaration.
6059 Associate decls with the names and store the decls
6060 into the TREE_PURPOSE slots. */
6062 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6063 DECL_RESULT (parm) = 0;
6065 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6067 register tree tail, found = NULL;
6069 if (TREE_VALUE (parm) == 0)
6071 error_with_decl (fndecl, "parameter name missing from parameter list");
6072 TREE_PURPOSE (parm) = 0;
6076 /* See if any of the parmdecls specifies this parm by name.
6077 Ignore any enumerator decls. */
6078 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6079 if (DECL_NAME (tail) == TREE_VALUE (parm)
6080 && TREE_CODE (tail) == PARM_DECL)
6086 /* If declaration already marked, we have a duplicate name.
6087 Complain, and don't use this decl twice. */
6088 if (found && DECL_RESULT (found) != 0)
6090 error_with_decl (found, "multiple parameters named `%s'");
6094 /* If the declaration says "void", complain and ignore it. */
6095 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6097 error_with_decl (found, "parameter `%s' declared void");
6098 TREE_TYPE (found) = integer_type_node;
6099 DECL_ARG_TYPE (found) = integer_type_node;
6100 layout_decl (found, 0);
6103 /* Traditionally, a parm declared float is actually a double. */
6104 if (found && flag_traditional
6105 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6107 TREE_TYPE (found) = double_type_node;
6108 DECL_ARG_TYPE (found) = double_type_node;
6109 layout_decl (found, 0);
6112 /* If no declaration found, default to int. */
6115 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6117 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6118 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6119 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6121 warning_with_decl (found, "type of `%s' defaults to `int'");
6125 TREE_PURPOSE (parm) = found;
6127 /* Mark this decl as "already found" -- see test, above.
6128 It is safe to use DECL_RESULT for this
6129 since it is not used in PARM_DECLs or CONST_DECLs. */
6130 DECL_RESULT (found) = error_mark_node;
6133 /* Put anything which is on the parmdecls chain and which is
6134 not a PARM_DECL onto the list NONPARMS. (The types of
6135 non-parm things which might appear on the list include
6136 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6137 any actual PARM_DECLs not matched with any names. */
6140 for (parm = parmdecls; parm; )
6142 tree next = TREE_CHAIN (parm);
6143 TREE_CHAIN (parm) = 0;
6145 if (TREE_CODE (parm) != PARM_DECL)
6146 nonparms = chainon (nonparms, parm);
6149 /* Complain about args with incomplete types. */
6150 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6152 error_with_decl (parm, "parameter `%s' has incomplete type");
6153 TREE_TYPE (parm) = error_mark_node;
6156 if (DECL_RESULT (parm) == 0)
6158 error_with_decl (parm,
6159 "declaration for parameter `%s' but no such parameter");
6160 /* Pretend the parameter was not missing.
6161 This gets us to a standard state and minimizes
6162 further error messages. */
6164 = chainon (specparms,
6165 tree_cons (parm, NULL_TREE, NULL_TREE));
6172 /* Chain the declarations together in the order of the list of names. */
6173 /* Store that chain in the function decl, replacing the list of names. */
6175 DECL_ARGUMENTS (fndecl) = 0;
6178 for (last = 0; parm; parm = TREE_CHAIN (parm))
6179 if (TREE_PURPOSE (parm))
6182 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6184 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6185 last = TREE_PURPOSE (parm);
6186 TREE_CHAIN (last) = 0;
6190 /* If there was a previous prototype,
6191 set the DECL_ARG_TYPE of each argument according to
6192 the type previously specified, and report any mismatches. */
6194 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6197 for (parm = DECL_ARGUMENTS (fndecl),
6198 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6199 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6200 != void_type_node));
6201 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6203 if (parm == 0 || type == 0
6204 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6206 error ("number of arguments doesn't match prototype");
6207 error_with_file_and_line (current_function_prototype_file,
6208 current_function_prototype_line,
6209 "prototype declaration");
6212 /* Type for passing arg must be consistent
6213 with that declared for the arg. */
6214 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6216 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6217 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6219 /* Adjust argument to match prototype. E.g. a previous
6220 `int foo(float);' prototype causes
6221 `int foo(x) float x; {...}' to be treated like
6222 `int foo(float x) {...}'. This is particularly
6223 useful for argument types like uid_t. */
6224 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6225 #ifdef PROMOTE_PROTOTYPES
6226 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6227 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6228 && TYPE_PRECISION (TREE_TYPE (parm))
6229 < TYPE_PRECISION (integer_type_node))
6230 DECL_ARG_TYPE (parm) = integer_type_node;
6234 pedwarn ("promoted argument `%s' doesn't match prototype",
6235 IDENTIFIER_POINTER (DECL_NAME (parm)));
6236 warning_with_file_and_line
6237 (current_function_prototype_file,
6238 current_function_prototype_line,
6239 "prototype declaration");
6242 /* If -traditional, allow `int' argument to match
6243 `unsigned' prototype. */
6244 else if (! (flag_traditional
6245 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6246 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6248 error ("argument `%s' doesn't match prototype",
6249 IDENTIFIER_POINTER (DECL_NAME (parm)));
6250 error_with_file_and_line (current_function_prototype_file,
6251 current_function_prototype_line,
6252 "prototype declaration");
6256 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6259 /* Otherwise, create a prototype that would match. */
6263 tree actual = 0, last = 0, type;
6265 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6267 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6270 TREE_CHAIN (last) = type;
6275 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6277 TREE_CHAIN (last) = type;
6281 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6282 of the type of this function, but we need to avoid having this
6283 affect the types of other similarly-typed functions, so we must
6284 first force the generation of an identical (but separate) type
6285 node for the relevant function type. The new node we create
6286 will be a variant of the main variant of the original function
6289 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6291 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6294 /* Now store the final chain of decls for the arguments
6295 as the decl-chain of the current lexical scope.
6296 Put the enumerators in as well, at the front so that
6297 DECL_ARGUMENTS is not modified. */
6299 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6302 /* Make sure the binding level for the top of the function body
6303 gets a BLOCK if there are any in the function.
6304 Otherwise, the dbx output is wrong. */
6306 keep_next_if_subblocks = 1;
6308 /* ??? This might be an improvement,
6309 but needs to be thought about some more. */
6311 keep_next_level_flag = 1;
6314 /* Write a record describing this function definition to the prototypes
6315 file (if requested). */
6317 gen_aux_info_record (fndecl, 1, 0, prototype);
6319 /* Initialize the RTL code for the function. */
6321 init_function_start (fndecl, input_filename, lineno);
6323 /* If this is a varargs function, inform function.c. */
6325 if (c_function_varargs)
6328 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6330 declare_function_name ();
6332 /* Set up parameters and prepare for return, for the function. */
6334 expand_function_start (fndecl, 0);
6336 /* If this function is `main', emit a call to `__main'
6337 to run global initializers, etc. */
6338 if (DECL_NAME (fndecl)
6339 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6340 && DECL_CONTEXT (fndecl) == NULL_TREE)
6341 expand_main_function ();
6344 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6345 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6346 stands for an ellipsis in the identifier list.
6348 PARMLIST is the data returned by get_parm_info for the
6349 parmlist that follows the semicolon.
6351 We return a value of the same sort that get_parm_info returns,
6352 except that it describes the combination of identifiers and parmlist. */
6355 combine_parm_decls (specparms, parmlist, void_at_end)
6356 tree specparms, parmlist;
6359 register tree fndecl = current_function_decl;
6362 tree parmdecls = TREE_PURPOSE (parmlist);
6364 /* This is a chain of any other decls that came in among the parm
6365 declarations. They were separated already by get_parm_info,
6366 so we just need to keep them separate. */
6367 tree nonparms = TREE_VALUE (parmlist);
6371 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6372 DECL_RESULT (parm) = 0;
6374 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6376 register tree tail, found = NULL;
6378 /* See if any of the parmdecls specifies this parm by name. */
6379 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6380 if (DECL_NAME (tail) == TREE_VALUE (parm))
6386 /* If declaration already marked, we have a duplicate name.
6387 Complain, and don't use this decl twice. */
6388 if (found && DECL_RESULT (found) != 0)
6390 error_with_decl (found, "multiple parameters named `%s'");
6394 /* If the declaration says "void", complain and ignore it. */
6395 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6397 error_with_decl (found, "parameter `%s' declared void");
6398 TREE_TYPE (found) = integer_type_node;
6399 DECL_ARG_TYPE (found) = integer_type_node;
6400 layout_decl (found, 0);
6403 /* Traditionally, a parm declared float is actually a double. */
6404 if (found && flag_traditional
6405 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6407 TREE_TYPE (found) = double_type_node;
6408 DECL_ARG_TYPE (found) = double_type_node;
6409 layout_decl (found, 0);
6412 /* If no declaration found, default to int. */
6415 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6417 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6418 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6419 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6420 error_with_decl (found, "type of parameter `%s' is not declared");
6424 TREE_PURPOSE (parm) = found;
6426 /* Mark this decl as "already found" -- see test, above.
6427 It is safe to use DECL_RESULT for this
6428 since it is not used in PARM_DECLs or CONST_DECLs. */
6429 DECL_RESULT (found) = error_mark_node;
6432 /* Complain about any actual PARM_DECLs not matched with any names. */
6434 for (parm = parmdecls; parm; )
6436 tree next = TREE_CHAIN (parm);
6437 TREE_CHAIN (parm) = 0;
6439 /* Complain about args with incomplete types. */
6440 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6442 error_with_decl (parm, "parameter `%s' has incomplete type");
6443 TREE_TYPE (parm) = error_mark_node;
6446 if (DECL_RESULT (parm) == 0)
6448 error_with_decl (parm,
6449 "declaration for parameter `%s' but no such parameter");
6450 /* Pretend the parameter was not missing.
6451 This gets us to a standard state and minimizes
6452 further error messages. */
6454 = chainon (specparms,
6455 tree_cons (parm, NULL_TREE, NULL_TREE));
6461 /* Chain the declarations together in the order of the list of names.
6462 At the same time, build up a list of their types, in reverse order. */
6468 for (last = 0; parm; parm = TREE_CHAIN (parm))
6469 if (TREE_PURPOSE (parm))
6472 parmdecls = TREE_PURPOSE (parm);
6474 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6475 last = TREE_PURPOSE (parm);
6476 TREE_CHAIN (last) = 0;
6478 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6483 return saveable_tree_cons (parmdecls, nonparms,
6484 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
6486 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6489 /* Finish up a function declaration and compile that function
6490 all the way to assembler language output. The free the storage
6491 for the function definition.
6493 This is called after parsing the body of the function definition.
6495 NESTED is nonzero if the function being finished is nested in another. */
6498 finish_function (nested)
6501 register tree fndecl = current_function_decl;
6503 /* TREE_READONLY (fndecl) = 1;
6504 This caused &foo to be of type ptr-to-const-function
6505 which then got a warning when stored in a ptr-to-function variable. */
6508 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6510 /* Must mark the RESULT_DECL as being in this function. */
6512 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6514 /* Obey `register' declarations if `setjmp' is called in this fn. */
6515 if (flag_traditional && current_function_calls_setjmp)
6517 setjmp_protect (DECL_INITIAL (fndecl));
6518 setjmp_protect_args ();
6521 #ifdef DEFAULT_MAIN_RETURN
6522 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6524 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6525 != integer_type_node)
6526 warning_with_decl (fndecl, "return type of `%s' is not `int'");
6529 /* Make it so that `main' always returns success by default. */
6530 DEFAULT_MAIN_RETURN;
6535 /* Generate rtl for function exit. */
6536 expand_function_end (input_filename, lineno, 0);
6538 /* So we can tell if jump_optimize sets it to 1. */
6541 /* Run the optimizers and output the assembler code for this function. */
6542 rest_of_compilation (fndecl);
6544 current_function_returns_null |= can_reach_end;
6546 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6547 warning ("`noreturn' function does return");
6548 else if (warn_return_type && can_reach_end
6549 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6550 /* If this function returns non-void and control can drop through,
6552 warning ("control reaches end of non-void function");
6553 /* With just -W, complain only if function returns both with
6554 and without a value. */
6555 else if (extra_warnings
6556 && current_function_returns_value && current_function_returns_null)
6557 warning ("this function may return with or without a value");
6559 /* If requested, warn about function definitions where the function will
6560 return a value (usually of some struct or union type) which itself will
6561 take up a lot of stack space. */
6563 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6565 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6569 register tree ret_type_size = TYPE_SIZE (ret_type);
6571 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6574 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6576 if (units > larger_than_size)
6577 warning_with_decl (fndecl,
6578 "size of return value of `%s' is %u bytes",
6584 /* Free all the tree nodes making up this function. */
6585 /* Switch back to allocating nodes permanently
6586 until we start another function. */
6588 permanent_allocation (1);
6590 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6592 /* Stop pointing to the local nodes about to be freed. */
6593 /* But DECL_INITIAL must remain nonzero so we know this
6594 was an actual function definition. */
6595 /* For a nested function, this is done in pop_c_function_context. */
6596 /* If rest_of_compilation set this to 0, leave it 0. */
6597 if (DECL_INITIAL (fndecl) != 0)
6598 DECL_INITIAL (fndecl) = error_mark_node;
6599 DECL_ARGUMENTS (fndecl) = 0;
6604 /* Let the error reporting routines know that we're outside a
6605 function. For a nested function, this value is used in
6606 pop_c_function_context and then reset via pop_function_context. */
6607 current_function_decl = NULL;
6611 /* Save and restore the variables in this file and elsewhere
6612 that keep track of the progress of compilation of the current function.
6613 Used for nested functions. */
6617 struct c_function *next;
6619 tree shadowed_labels;
6622 int warn_about_return_type;
6624 struct binding_level *binding_level;
6627 struct c_function *c_function_chain;
6629 /* Save and reinitialize the variables
6630 used during compilation of a C function. */
6633 push_c_function_context ()
6635 struct c_function *p
6636 = (struct c_function *) xmalloc (sizeof (struct c_function));
6639 pedwarn ("ANSI C forbids nested functions");
6641 push_function_context ();
6643 p->next = c_function_chain;
6644 c_function_chain = p;
6646 p->named_labels = named_labels;
6647 p->shadowed_labels = shadowed_labels;
6648 p->returns_value = current_function_returns_value;
6649 p->returns_null = current_function_returns_null;
6650 p->warn_about_return_type = warn_about_return_type;
6651 p->extern_inline = current_extern_inline;
6652 p->binding_level = current_binding_level;
6655 /* Restore the variables used during compilation of a C function. */
6658 pop_c_function_context ()
6660 struct c_function *p = c_function_chain;
6663 /* Bring back all the labels that were shadowed. */
6664 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
6665 if (DECL_NAME (TREE_VALUE (link)) != 0)
6666 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
6667 = TREE_VALUE (link);
6669 if (DECL_SAVED_INSNS (current_function_decl) == 0)
6671 /* Stop pointing to the local nodes about to be freed. */
6672 /* But DECL_INITIAL must remain nonzero so we know this
6673 was an actual function definition. */
6674 DECL_INITIAL (current_function_decl) = error_mark_node;
6675 DECL_ARGUMENTS (current_function_decl) = 0;
6678 pop_function_context ();
6680 c_function_chain = p->next;
6682 named_labels = p->named_labels;
6683 shadowed_labels = p->shadowed_labels;
6684 current_function_returns_value = p->returns_value;
6685 current_function_returns_null = p->returns_null;
6686 warn_about_return_type = p->warn_about_return_type;
6687 current_extern_inline = p->extern_inline;
6688 current_binding_level = p->binding_level;