gcc/c-parse.in

   1 /* YACC parser for C syntax and for Objective C.  -*-c-*-
   2    Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996,
   3    1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* This file defines the grammar of C and that of Objective C.
  23    ifobjc ... end ifobjc  conditionals contain code for Objective C only.
  24    ifc ... end ifc  conditionals contain code for C only.
  25    Sed commands in Makefile.in are used to convert this file into
  26    c-parse.y and into objc-parse.y.  */
  27
  28 /* To whomever it may concern: I have heard that such a thing was once
  29    written by AT&T, but I have never seen it.  */
  30
  31 ifobjc
  32 %expect 74
  33 end ifobjc
  34 ifc
  35 %expect 53
  36 end ifc
  37
  38 %{
  39 #include "config.h"
  40 #include "system.h"
  41 #include <setjmp.h>
  42 #include "tree.h"
  43 #include "input.h"
  44 #include "cpplib.h"
  45 #include "intl.h"
  46 #include "timevar.h"
  47 #include "c-lex.h"
  48 #include "c-tree.h"
  49 #include "c-pragma.h"
  50 #include "flags.h"
  51 #include "output.h"
  52 #include "toplev.h"
  53 #include "ggc.h"
  54
  55 #ifdef MULTIBYTE_CHARS
  56 #include <locale.h>
  57 #endif
  58
  59 ifobjc
  60 #include "objc-act.h"
  61 end ifobjc
  62
  63 /* Since parsers are distinct for each language, put the language string
  64    definition here.  */
  65 ifobjc
  66 const char * const language_string = "GNU Objective-C";
  67 end ifobjc
  68 ifc
  69 const char * const language_string = "GNU C";
  70 end ifc
  71
  72 /* Like YYERROR but do call yyerror.  */
  73 #define YYERROR1 { yyerror ("syntax error"); YYERROR; }
  74
  75 /* Cause the "yydebug" variable to be defined.  */
  76 #define YYDEBUG 1
  77
  78 /* Rename the "yyparse" function so that we can override it elsewhere.  */
  79 #define yyparse yyparse_1
  80 %}
  81
  82 %start program
  83
  84 %union {long itype; tree ttype; enum tree_code code;
  85         const char *filename; int lineno; }
  86
  87 /* All identifiers that are not reserved words
  88    and are not declared typedefs in the current block */
  89 %token IDENTIFIER
  90
  91 /* All identifiers that are declared typedefs in the current block.
  92    In some contexts, they are treated just like IDENTIFIER,
  93    but they can also serve as typespecs in declarations.  */
  94 %token TYPENAME
  95
  96 /* Reserved words that specify storage class.
  97    yylval contains an IDENTIFIER_NODE which indicates which one.  */
  98 %token SCSPEC
  99
 100 /* Reserved words that specify type.
 101    yylval contains an IDENTIFIER_NODE which indicates which one.  */
 102 %token TYPESPEC
 103
 104 /* Reserved words that qualify type: "const", "volatile", or "restrict".
 105    yylval contains an IDENTIFIER_NODE which indicates which one.  */
 106 %token TYPE_QUAL
 107
 108 /* Character or numeric constants.
 109    yylval is the node for the constant.  */
 110 %token CONSTANT
 111
 112 /* String constants in raw form.
 113    yylval is a STRING_CST node.  */
 114 %token STRING
 115
 116 /* "...", used for functions with variable arglists.  */
 117 %token ELLIPSIS
 118
 119 /* the reserved words */
 120 /* SCO include files test "ASM", so use something else. */
 121 %token SIZEOF ENUM STRUCT UNION IF ELSE WHILE DO FOR SWITCH CASE DEFAULT
 122 %token BREAK CONTINUE RETURN GOTO ASM_KEYWORD TYPEOF ALIGNOF
 123 %token ATTRIBUTE EXTENSION LABEL
 124 %token REALPART IMAGPART VA_ARG
 125 %token PTR_VALUE PTR_BASE PTR_EXTENT
 126
 127 /* Add precedence rules to solve dangling else s/r conflict */
 128 %nonassoc IF
 129 %nonassoc ELSE
 130
 131 /* Define the operator tokens and their precedences.
 132    The value is an integer because, if used, it is the tree code
 133    to use in the expression made from the operator.  */
 134
 135 %right <code> ASSIGN '='
 136 %right <code> '?' ':'
 137 %left <code> OROR
 138 %left <code> ANDAND
 139 %left <code> '|'
 140 %left <code> '^'
 141 %left <code> '&'
 142 %left <code> EQCOMPARE
 143 %left <code> ARITHCOMPARE
 144 %left <code> LSHIFT RSHIFT
 145 %left <code> '+' '-'
 146 %left <code> '*' '/' '%'
 147 %right <code> UNARY PLUSPLUS MINUSMINUS
 148 %left HYPERUNARY
 149 %left <code> POINTSAT '.' '(' '['
 150
 151 /* The Objective-C keywords.  These are included in C and in
 152    Objective C, so that the token codes are the same in both.  */
 153 %token INTERFACE IMPLEMENTATION END SELECTOR DEFS ENCODE
 154 %token CLASSNAME PUBLIC PRIVATE PROTECTED PROTOCOL OBJECTNAME CLASS ALIAS
 155
 156 /* Objective-C string constants in raw form.
 157    yylval is an STRING_CST node.  */
 158 %token OBJC_STRING
 159
 160
 161 %type <code> unop
 162 %type <ttype> ENUM STRUCT UNION IF ELSE WHILE DO FOR SWITCH CASE DEFAULT
 163 %type <ttype> BREAK CONTINUE RETURN GOTO ASM_KEYWORD SIZEOF TYPEOF ALIGNOF
 164
 165 %type <ttype> identifier IDENTIFIER TYPENAME CONSTANT expr nonnull_exprlist exprlist
 166 %type <ttype> expr_no_commas cast_expr unary_expr primary string STRING
 167 %type <ttype> typed_declspecs reserved_declspecs
 168 %type <ttype> typed_typespecs reserved_typespecquals
 169 %type <ttype> declmods typespec typespecqual_reserved
 170 %type <ttype> typed_declspecs_no_prefix_attr reserved_declspecs_no_prefix_attr
 171 %type <ttype> declmods_no_prefix_attr
 172 %type <ttype> SCSPEC TYPESPEC TYPE_QUAL nonempty_type_quals maybe_type_qual
 173 %type <ttype> initdecls notype_initdecls initdcl notype_initdcl
 174 %type <ttype> init maybeasm
 175 %type <ttype> asm_operands nonnull_asm_operands asm_operand asm_clobbers
 176 %type <ttype> maybe_attribute attributes attribute attribute_list attrib
 177 %type <ttype> any_word extension
 178
 179 %type <ttype> compstmt compstmt_start compstmt_nostart compstmt_primary_start
 180 %type <ttype> do_stmt_start poplevel stmt label
 181
 182 %type <ttype> c99_block_start c99_block_end
 183 %type <ttype> declarator
 184 %type <ttype> notype_declarator after_type_declarator
 185 %type <ttype> parm_declarator
 186
 187 %type <ttype> structsp component_decl_list component_decl_list2
 188 %type <ttype> component_decl components component_declarator
 189 %type <ttype> enumlist enumerator
 190 %type <ttype> struct_head union_head enum_head
 191 %type <ttype> typename absdcl absdcl1 type_quals
 192 %type <ttype> xexpr parms parm identifiers
 193
 194 %type <ttype> parmlist parmlist_1 parmlist_2
 195 %type <ttype> parmlist_or_identifiers parmlist_or_identifiers_1
 196 %type <ttype> identifiers_or_typenames
 197
 198 %type <itype> setspecs
 199
 200 %type <filename> save_filename
 201 %type <lineno> save_lineno
 202 \f
 203 ifobjc
 204 /* the Objective-C nonterminals */
 205
 206 %type <ttype> ivar_decl_list ivar_decls ivar_decl ivars ivar_declarator
 207 %type <ttype> methoddecl unaryselector keywordselector selector
 208 %type <ttype> keyworddecl receiver objcmessageexpr messageargs
 209 %type <ttype> keywordexpr keywordarglist keywordarg
 210 %type <ttype> myparms myparm optparmlist reservedwords objcselectorexpr
 211 %type <ttype> selectorarg keywordnamelist keywordname objcencodeexpr
 212 %type <ttype> objc_string non_empty_protocolrefs protocolrefs identifier_list objcprotocolexpr
 213
 214 %type <ttype> CLASSNAME OBJC_STRING OBJECTNAME
 215 end ifobjc
 216 \f
 217 %{
 218 /* Number of statements (loosely speaking) and compound statements
 219    seen so far.  */
 220 static int stmt_count;
 221 static int compstmt_count;
 222
 223 /* Input file and line number of the end of the body of last simple_if;
 224    used by the stmt-rule immediately after simple_if returns.  */
 225 static const char *if_stmt_file;
 226 static int if_stmt_line;
 227
 228 /* List of types and structure classes of the current declaration.  */
 229 static tree current_declspecs = NULL_TREE;
 230 static tree prefix_attributes = NULL_TREE;
 231
 232 /* Stack of saved values of current_declspecs and prefix_attributes.  */
 233 static tree declspec_stack;
 234
 235 /* For __extension__, save/restore the warning flags which are
 236    controlled by __extension__.  */
 237 #define SAVE_WARN_FLAGS()       \
 238         size_int (pedantic | (warn_pointer_arith << 1))
 239 #define RESTORE_WARN_FLAGS(tval) \
 240   do {                                     \
 241     int val = tree_low_cst (tval, 0);      \
 242     pedantic = val & 1;                    \
 243     warn_pointer_arith = (val >> 1) & 1;   \
 244   } while (0)
 245
 246 ifobjc
 247 /* Objective-C specific information */
 248
 249 tree objc_interface_context;
 250 tree objc_implementation_context;
 251 tree objc_method_context;
 252 tree objc_ivar_chain;
 253 tree objc_ivar_context;
 254 enum tree_code objc_inherit_code;
 255 int objc_receiver_context;
 256 int objc_public_flag;
 257
 258 end ifobjc
 259
 260 /* Tell yyparse how to print a token's value, if yydebug is set.  */
 261
 262 #define YYPRINT(FILE,YYCHAR,YYLVAL) yyprint(FILE,YYCHAR,YYLVAL)
 263
 264 static void yyprint       PARAMS ((FILE *, int, YYSTYPE));
 265 static void yyerror       PARAMS ((const char *));
 266 static inline int _yylex  PARAMS ((void));
 267 static int  yylex         PARAMS ((void));
 268 static void init_reswords PARAMS ((void));
 269
 270 /* Add GC roots for variables local to this file.  */
 271 void
 272 c_parse_init ()
 273 {
 274   ggc_add_tree_root (&declspec_stack, 1);
 275   ggc_add_tree_root (&current_declspecs, 1);
 276   ggc_add_tree_root (&prefix_attributes, 1);
 277 ifobjc
 278   ggc_add_tree_root (&objc_interface_context, 1);
 279   ggc_add_tree_root (&objc_implementation_context, 1);
 280   ggc_add_tree_root (&objc_method_context, 1);
 281   ggc_add_tree_root (&objc_ivar_chain, 1);
 282   ggc_add_tree_root (&objc_ivar_context, 1);
 283 end ifobjc
 284 }
 285
 286 %}
 287 \f
 288 %%
 289 program: /* empty */
 290                 { if (pedantic)
 291                     pedwarn ("ISO C forbids an empty source file");
 292                   finish_file ();
 293                 }
 294         | extdefs
 295                 {
 296                   /* In case there were missing closebraces,
 297                      get us back to the global binding level.  */
 298                   while (! global_bindings_p ())
 299                     poplevel (0, 0, 0);
 300                   finish_file ();
 301                 }
 302         ;
 303
 304 /* the reason for the strange actions in this rule
 305  is so that notype_initdecls when reached via datadef
 306  can find a valid list of type and sc specs in $0. */
 307
 308 extdefs:
 309         {$<ttype>$ = NULL_TREE; } extdef
 310         | extdefs {$<ttype>$ = NULL_TREE; ggc_collect(); } extdef
 311         ;
 312
 313 extdef:
 314         fndef
 315         | datadef
 316 ifobjc
 317         | objcdef
 318 end ifobjc
 319         | ASM_KEYWORD '(' expr ')' ';'
 320                 { STRIP_NOPS ($3);
 321                   if ((TREE_CODE ($3) == ADDR_EXPR
 322                        && TREE_CODE (TREE_OPERAND ($3, 0)) == STRING_CST)
 323                       || TREE_CODE ($3) == STRING_CST)
 324                     assemble_asm ($3);
 325                   else
 326                     error ("argument of `asm' is not a constant string"); }
 327         | extension extdef
 328                 { RESTORE_WARN_FLAGS ($1); }
 329         ;
 330
 331 datadef:
 332           setspecs notype_initdecls ';'
 333                 { if (pedantic)
 334                     error ("ISO C forbids data definition with no type or storage class");
 335                   else if (!flag_traditional)
 336                     warning ("data definition has no type or storage class");
 337
 338                   current_declspecs = TREE_VALUE (declspec_stack);
 339                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 340                   declspec_stack = TREE_CHAIN (declspec_stack); }
 341         | declmods setspecs notype_initdecls ';'
 342                 { current_declspecs = TREE_VALUE (declspec_stack);
 343                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 344                   declspec_stack = TREE_CHAIN (declspec_stack); }
 345         | typed_declspecs setspecs initdecls ';'
 346                 { current_declspecs = TREE_VALUE (declspec_stack);
 347                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 348                   declspec_stack = TREE_CHAIN (declspec_stack); }
 349         | declmods ';'
 350           { pedwarn ("empty declaration"); }
 351         | typed_declspecs ';'
 352           { shadow_tag ($1); }
 353         | error ';'
 354         | error '}'
 355         | ';'
 356                 { if (pedantic)
 357                     pedwarn ("ISO C does not allow extra `;' outside of a function"); }
 358         ;
 359 \f
 360 fndef:
 361           typed_declspecs setspecs declarator
 362                 { if (! start_function (current_declspecs, $3,
 363                                         prefix_attributes, NULL_TREE))
 364                     YYERROR1;
 365                 }
 366           old_style_parm_decls
 367                 { store_parm_decls (); }
 368           save_filename save_lineno compstmt_or_error
 369                 { DECL_SOURCE_FILE (current_function_decl) = $7;
 370                   DECL_SOURCE_LINE (current_function_decl) = $8;
 371                   finish_function (0);
 372                   current_declspecs = TREE_VALUE (declspec_stack);
 373                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 374                   declspec_stack = TREE_CHAIN (declspec_stack); }
 375         | typed_declspecs setspecs declarator error
 376                 { current_declspecs = TREE_VALUE (declspec_stack);
 377                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 378                   declspec_stack = TREE_CHAIN (declspec_stack); }
 379         | declmods setspecs notype_declarator
 380                 { if (! start_function (current_declspecs, $3,
 381                                         prefix_attributes, NULL_TREE))
 382                     YYERROR1;
 383                 }
 384           old_style_parm_decls
 385                 { store_parm_decls (); }
 386           save_filename save_lineno compstmt_or_error
 387                 { DECL_SOURCE_FILE (current_function_decl) = $7;
 388                   DECL_SOURCE_LINE (current_function_decl) = $8;
 389                   finish_function (0);
 390                   current_declspecs = TREE_VALUE (declspec_stack);
 391                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 392                   declspec_stack = TREE_CHAIN (declspec_stack); }
 393         | declmods setspecs notype_declarator error
 394                 { current_declspecs = TREE_VALUE (declspec_stack);
 395                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 396                   declspec_stack = TREE_CHAIN (declspec_stack); }
 397         | setspecs notype_declarator
 398                 { if (! start_function (NULL_TREE, $2,
 399                                         prefix_attributes, NULL_TREE))
 400                     YYERROR1;
 401                 }
 402           old_style_parm_decls
 403                 { store_parm_decls (); }
 404           save_filename save_lineno compstmt_or_error
 405                 { DECL_SOURCE_FILE (current_function_decl) = $6;
 406                   DECL_SOURCE_LINE (current_function_decl) = $7;
 407                   finish_function (0);
 408                   current_declspecs = TREE_VALUE (declspec_stack);
 409                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 410                   declspec_stack = TREE_CHAIN (declspec_stack); }
 411         | setspecs notype_declarator error
 412                 { current_declspecs = TREE_VALUE (declspec_stack);
 413                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 414                   declspec_stack = TREE_CHAIN (declspec_stack); }
 415         ;
 416
 417 identifier:
 418         IDENTIFIER
 419         | TYPENAME
 420 ifobjc
 421         | OBJECTNAME
 422         | CLASSNAME
 423 end ifobjc
 424         ;
 425
 426 unop:     '&'
 427                 { $$ = ADDR_EXPR; }
 428         | '-'
 429                 { $$ = NEGATE_EXPR; }
 430         | '+'
 431                 { $$ = CONVERT_EXPR;
 432 ifc
 433   if (warn_traditional && !in_system_header)
 434     warning ("traditional C rejects the unary plus operator");
 435 end ifc
 436                 }
 437         | PLUSPLUS
 438                 { $$ = PREINCREMENT_EXPR; }
 439         | MINUSMINUS
 440                 { $$ = PREDECREMENT_EXPR; }
 441         | '~'
 442                 { $$ = BIT_NOT_EXPR; }
 443         | '!'
 444                 { $$ = TRUTH_NOT_EXPR; }
 445         ;
 446
 447 expr:   nonnull_exprlist
 448                 { $$ = build_compound_expr ($1); }
 449         ;
 450
 451 exprlist:
 452           /* empty */
 453                 { $$ = NULL_TREE; }
 454         | nonnull_exprlist
 455         ;
 456
 457 nonnull_exprlist:
 458         expr_no_commas
 459                 { $$ = build_tree_list (NULL_TREE, $1); }
 460         | nonnull_exprlist ',' expr_no_commas
 461                 { chainon ($1, build_tree_list (NULL_TREE, $3)); }
 462         ;
 463
 464 unary_expr:
 465         primary
 466         | '*' cast_expr   %prec UNARY
 467                 { $$ = build_indirect_ref ($2, "unary *"); }
 468         /* __extension__ turns off -pedantic for following primary.  */
 469         | extension cast_expr     %prec UNARY
 470                 { $$ = $2;
 471                   RESTORE_WARN_FLAGS ($1); }
 472         | unop cast_expr  %prec UNARY
 473                 { $$ = build_unary_op ($1, $2, 0);
 474                   overflow_warning ($$); }
 475         /* Refer to the address of a label as a pointer.  */
 476         | ANDAND identifier
 477                 { tree label = lookup_label ($2);
 478                   if (pedantic)
 479                     pedwarn ("ISO C forbids `&&'");
 480                   if (label == 0)
 481                     $$ = null_pointer_node;
 482                   else
 483                     {
 484                       TREE_USED (label) = 1;
 485                       $$ = build1 (ADDR_EXPR, ptr_type_node, label);
 486                       TREE_CONSTANT ($$) = 1;
 487                     }
 488                 }
 489 /* This seems to be impossible on some machines, so let's turn it off.
 490    You can use __builtin_next_arg to find the anonymous stack args.
 491         | '&' ELLIPSIS
 492                 { tree types = TYPE_ARG_TYPES (TREE_TYPE (current_function_decl));
 493                   $$ = error_mark_node;
 494                   if (TREE_VALUE (tree_last (types)) == void_type_node)
 495                     error ("`&...' used in function with fixed number of arguments");
 496                   else
 497                     {
 498                       if (pedantic)
 499                         pedwarn ("ISO C forbids `&...'");
 500                       $$ = tree_last (DECL_ARGUMENTS (current_function_decl));
 501                       $$ = build_unary_op (ADDR_EXPR, $$, 0);
 502                     } }
 503 */
 504         | sizeof unary_expr  %prec UNARY
 505                 { skip_evaluation--;
 506                   if (TREE_CODE ($2) == COMPONENT_REF
 507                       && DECL_C_BIT_FIELD (TREE_OPERAND ($2, 1)))
 508                     error ("`sizeof' applied to a bit-field");
 509                   $$ = c_sizeof (TREE_TYPE ($2)); }
 510         | sizeof '(' typename ')'  %prec HYPERUNARY
 511                 { skip_evaluation--;
 512                   $$ = c_sizeof (groktypename ($3)); }
 513         | alignof unary_expr  %prec UNARY
 514                 { skip_evaluation--;
 515                   $$ = c_alignof_expr ($2); }
 516         | alignof '(' typename ')'  %prec HYPERUNARY
 517                 { skip_evaluation--;
 518                   $$ = c_alignof (groktypename ($3)); }
 519         | REALPART cast_expr %prec UNARY
 520                 { $$ = build_unary_op (REALPART_EXPR, $2, 0); }
 521         | IMAGPART cast_expr %prec UNARY
 522                 { $$ = build_unary_op (IMAGPART_EXPR, $2, 0); }
 523         ;
 524
 525 sizeof:
 526         SIZEOF { skip_evaluation++; }
 527         ;
 528
 529 alignof:
 530         ALIGNOF { skip_evaluation++; }
 531         ;
 532
 533 cast_expr:
 534         unary_expr
 535         | '(' typename ')' cast_expr  %prec UNARY
 536                 { tree type;
 537                   int SAVED_warn_strict_prototypes = warn_strict_prototypes;
 538                   /* This avoids warnings about unprototyped casts on
 539                      integers.  E.g. "#define SIG_DFL (void(*)())0".  */
 540                   if (TREE_CODE ($4) == INTEGER_CST)
 541                     warn_strict_prototypes = 0;
 542                   type = groktypename ($2);
 543                   warn_strict_prototypes = SAVED_warn_strict_prototypes;
 544                   $$ = build_c_cast (type, $4); }
 545         | '(' typename ')' '{'
 546                 { start_init (NULL_TREE, NULL, 0);
 547                   $2 = groktypename ($2);
 548                   really_start_incremental_init ($2); }
 549           initlist_maybe_comma '}'  %prec UNARY
 550                 { const char *name;
 551                   tree result = pop_init_level (0);
 552                   tree type = $2;
 553                   finish_init ();
 554
 555                   if (pedantic && ! flag_isoc99)
 556                     pedwarn ("ISO C89 forbids constructor expressions");
 557                   if (TYPE_NAME (type) != 0)
 558                     {
 559                       if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
 560                         name = IDENTIFIER_POINTER (TYPE_NAME (type));
 561                       else
 562                         name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
 563                     }
 564                   else
 565                     name = "";
 566                   $$ = result;
 567                   if (TREE_CODE (type) == ARRAY_TYPE && !COMPLETE_TYPE_P (type))
 568                     {
 569                       int failure = complete_array_type (type, $$, 1);
 570                       if (failure)
 571                         abort ();
 572                     }
 573                 }
 574         ;
 575
 576 expr_no_commas:
 577           cast_expr
 578         | expr_no_commas '+' expr_no_commas
 579                 { $$ = parser_build_binary_op ($2, $1, $3); }
 580         | expr_no_commas '-' expr_no_commas
 581                 { $$ = parser_build_binary_op ($2, $1, $3); }
 582         | expr_no_commas '*' expr_no_commas
 583                 { $$ = parser_build_binary_op ($2, $1, $3); }
 584         | expr_no_commas '/' expr_no_commas
 585                 { $$ = parser_build_binary_op ($2, $1, $3); }
 586         | expr_no_commas '%' expr_no_commas
 587                 { $$ = parser_build_binary_op ($2, $1, $3); }
 588         | expr_no_commas LSHIFT expr_no_commas
 589                 { $$ = parser_build_binary_op ($2, $1, $3); }
 590         | expr_no_commas RSHIFT expr_no_commas
 591                 { $$ = parser_build_binary_op ($2, $1, $3); }
 592         | expr_no_commas ARITHCOMPARE expr_no_commas
 593                 { $$ = parser_build_binary_op ($2, $1, $3); }
 594         | expr_no_commas EQCOMPARE expr_no_commas
 595                 { $$ = parser_build_binary_op ($2, $1, $3); }
 596         | expr_no_commas '&' expr_no_commas
 597                 { $$ = parser_build_binary_op ($2, $1, $3); }
 598         | expr_no_commas '|' expr_no_commas
 599                 { $$ = parser_build_binary_op ($2, $1, $3); }
 600         | expr_no_commas '^' expr_no_commas
 601                 { $$ = parser_build_binary_op ($2, $1, $3); }
 602         | expr_no_commas ANDAND
 603                 { $1 = truthvalue_conversion (default_conversion ($1));
 604                   skip_evaluation += $1 == boolean_false_node; }
 605           expr_no_commas
 606                 { skip_evaluation -= $1 == boolean_false_node;
 607                   $$ = parser_build_binary_op (TRUTH_ANDIF_EXPR, $1, $4); }
 608         | expr_no_commas OROR
 609                 { $1 = truthvalue_conversion (default_conversion ($1));
 610                   skip_evaluation += $1 == boolean_true_node; }
 611           expr_no_commas
 612                 { skip_evaluation -= $1 == boolean_true_node;
 613                   $$ = parser_build_binary_op (TRUTH_ORIF_EXPR, $1, $4); }
 614         | expr_no_commas '?'
 615                 { $1 = truthvalue_conversion (default_conversion ($1));
 616                   skip_evaluation += $1 == boolean_false_node; }
 617           expr ':'
 618                 { skip_evaluation += (($1 == boolean_true_node)
 619                                       - ($1 == boolean_false_node)); }
 620           expr_no_commas
 621                 { skip_evaluation -= $1 == boolean_true_node;
 622                   $$ = build_conditional_expr ($1, $4, $7); }
 623         | expr_no_commas '?'
 624                 { if (pedantic)
 625                     pedwarn ("ISO C forbids omitting the middle term of a ?: expression");
 626                   /* Make sure first operand is calculated only once.  */
 627                   $<ttype>2 = save_expr ($1);
 628                   $1 = truthvalue_conversion (default_conversion ($<ttype>2));
 629                   skip_evaluation += $1 == boolean_true_node; }
 630           ':' expr_no_commas
 631                 { skip_evaluation -= $1 == boolean_true_node;
 632                   $$ = build_conditional_expr ($1, $<ttype>2, $5); }
 633         | expr_no_commas '=' expr_no_commas
 634                 { char class;
 635                   $$ = build_modify_expr ($1, NOP_EXPR, $3);
 636                   class = TREE_CODE_CLASS (TREE_CODE ($$));
 637                   if (class == 'e' || class == '1'
 638                       || class == '2' || class == '<')
 639                     C_SET_EXP_ORIGINAL_CODE ($$, MODIFY_EXPR);
 640                 }
 641         | expr_no_commas ASSIGN expr_no_commas
 642                 { char class;
 643                   $$ = build_modify_expr ($1, $2, $3);
 644                   /* This inhibits warnings in truthvalue_conversion.  */
 645                   class = TREE_CODE_CLASS (TREE_CODE ($$));
 646                   if (class == 'e' || class == '1'
 647                       || class == '2' || class == '<')
 648                     C_SET_EXP_ORIGINAL_CODE ($$, ERROR_MARK);
 649                 }
 650         ;
 651
 652 primary:
 653         IDENTIFIER
 654                 {
 655                   if (yychar == YYEMPTY)
 656                     yychar = YYLEX;
 657                   $$ = build_external_ref ($1, yychar == '(');
 658                 }
 659         | CONSTANT
 660         | string
 661                 { $$ = combine_strings ($1); }
 662         | '(' expr ')'
 663                 { char class = TREE_CODE_CLASS (TREE_CODE ($2));
 664                   if (class == 'e' || class == '1'
 665                       || class == '2' || class == '<')
 666                     C_SET_EXP_ORIGINAL_CODE ($2, ERROR_MARK);
 667                   $$ = $2; }
 668         | '(' error ')'
 669                 { $$ = error_mark_node; }
 670         | compstmt_primary_start compstmt_nostart ')'
 671                  { tree saved_last_tree;
 672
 673                    if (pedantic)
 674                      pedwarn ("ISO C forbids braced-groups within expressions");
 675                   pop_label_level ();
 676
 677                   saved_last_tree = COMPOUND_BODY ($1);
 678                   RECHAIN_STMTS ($1, COMPOUND_BODY ($1));
 679                   last_tree = saved_last_tree;
 680                   TREE_CHAIN (last_tree) = NULL_TREE;
 681                   if (!last_expr_type)
 682                     last_expr_type = void_type_node;
 683                   $$ = build1 (STMT_EXPR, last_expr_type, $1);
 684                   TREE_SIDE_EFFECTS ($$) = 1;
 685                 }
 686         | compstmt_primary_start error ')'
 687                 {
 688                   pop_label_level ();
 689                   last_tree = COMPOUND_BODY ($1);
 690                   TREE_CHAIN (last_tree) = NULL_TREE;
 691                   $$ = error_mark_node;
 692                 }
 693         | primary '(' exprlist ')'   %prec '.'
 694                 { $$ = build_function_call ($1, $3); }
 695         | VA_ARG '(' expr_no_commas ',' typename ')'
 696                 { $$ = build_va_arg ($3, groktypename ($5)); }
 697         | primary '[' expr ']'   %prec '.'
 698                 { $$ = build_array_ref ($1, $3); }
 699         | primary '.' identifier
 700                 {
 701 ifobjc
 702                   if (doing_objc_thang)
 703                     {
 704                       if (is_public ($1, $3))
 705                         $$ = build_component_ref ($1, $3);
 706                       else
 707                         $$ = error_mark_node;
 708                     }
 709                   else
 710 end ifobjc
 711                     $$ = build_component_ref ($1, $3);
 712                 }
 713         | primary POINTSAT identifier
 714                 {
 715                   tree expr = build_indirect_ref ($1, "->");
 716
 717 ifobjc
 718                   if (doing_objc_thang)
 719                     {
 720                       if (is_public (expr, $3))
 721                         $$ = build_component_ref (expr, $3);
 722                       else
 723                         $$ = error_mark_node;
 724                     }
 725                   else
 726 end ifobjc
 727                     $$ = build_component_ref (expr, $3);
 728                 }
 729         | primary PLUSPLUS
 730                 { $$ = build_unary_op (POSTINCREMENT_EXPR, $1, 0); }
 731         | primary MINUSMINUS
 732                 { $$ = build_unary_op (POSTDECREMENT_EXPR, $1, 0); }
 733 ifobjc
 734         | objcmessageexpr
 735                 { $$ = build_message_expr ($1); }
 736         | objcselectorexpr
 737                 { $$ = build_selector_expr ($1); }
 738         | objcprotocolexpr
 739                 { $$ = build_protocol_expr ($1); }
 740         | objcencodeexpr
 741                 { $$ = build_encode_expr ($1); }
 742         | objc_string
 743                 { $$ = build_objc_string_object ($1); }
 744 end ifobjc
 745         ;
 746
 747 /* Produces a STRING_CST with perhaps more STRING_CSTs chained onto it.  */
 748 string:
 749           STRING
 750         | string STRING
 751                 {
 752 ifc
 753                   static int last_lineno = 0;
 754                   static const char *last_input_filename = 0;
 755 end ifc
 756                   $$ = chainon ($1, $2);
 757 ifc
 758                   if (warn_traditional && !in_system_header
 759                       && (lineno != last_lineno || !last_input_filename ||
 760                           strcmp (last_input_filename, input_filename)))
 761                     {
 762                       warning ("traditional C rejects string concatenation");
 763                       last_lineno = lineno;
 764                       last_input_filename = input_filename;
 765                     }
 766 end ifc
 767                 }
 768         ;
 769
 770 ifobjc
 771 /* Produces an STRING_CST with perhaps more STRING_CSTs chained
 772    onto it, which is to be read as an ObjC string object.  */
 773 objc_string:
 774           OBJC_STRING
 775         | objc_string OBJC_STRING
 776                 { $$ = chainon ($1, $2); }
 777         ;
 778 end ifobjc
 779
 780 old_style_parm_decls:
 781         /* empty */
 782         | datadecls
 783         | datadecls ELLIPSIS
 784                 /* ... is used here to indicate a varargs function.  */
 785                 { c_mark_varargs ();
 786                   if (pedantic)
 787                     pedwarn ("ISO C does not permit use of `varargs.h'"); }
 788         ;
 789
 790 /* The following are analogous to lineno_decl, decls and decl
 791    except that they do not allow nested functions.
 792    They are used for old-style parm decls.  */
 793 lineno_datadecl:
 794           save_filename save_lineno datadecl
 795                 { }
 796         ;
 797
 798 datadecls:
 799         lineno_datadecl
 800         | errstmt
 801         | datadecls lineno_datadecl
 802         | lineno_datadecl errstmt
 803         ;
 804
 805 /* We don't allow prefix attributes here because they cause reduce/reduce
 806    conflicts: we can't know whether we're parsing a function decl with
 807    attribute suffix, or function defn with attribute prefix on first old
 808    style parm.  */
 809 datadecl:
 810         typed_declspecs_no_prefix_attr setspecs initdecls ';'
 811                 { current_declspecs = TREE_VALUE (declspec_stack);
 812                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 813                   declspec_stack = TREE_CHAIN (declspec_stack); }
 814         | declmods_no_prefix_attr setspecs notype_initdecls ';'
 815                 { current_declspecs = TREE_VALUE (declspec_stack);
 816                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 817                   declspec_stack = TREE_CHAIN (declspec_stack); }
 818         | typed_declspecs_no_prefix_attr ';'
 819                 { shadow_tag_warned ($1, 1);
 820                   pedwarn ("empty declaration"); }
 821         | declmods_no_prefix_attr ';'
 822                 { pedwarn ("empty declaration"); }
 823         ;
 824
 825 /* This combination which saves a lineno before a decl
 826    is the normal thing to use, rather than decl itself.
 827    This is to avoid shift/reduce conflicts in contexts
 828    where statement labels are allowed.  */
 829 lineno_decl:
 830           save_filename save_lineno decl
 831                 { }
 832         ;
 833
 834 /* records the type and storage class specs to use for processing
 835    the declarators that follow.
 836    Maintains a stack of outer-level values of current_declspecs,
 837    for the sake of parm declarations nested in function declarators.  */
 838 setspecs: /* empty */
 839                 { pending_xref_error ();
 840                   declspec_stack = tree_cons (prefix_attributes,
 841                                               current_declspecs,
 842                                               declspec_stack);
 843                   split_specs_attrs ($<ttype>0,
 844                                      &current_declspecs, &prefix_attributes); }
 845         ;
 846
 847 /* ??? Yuck.  See after_type_declarator.  */
 848 setattrs: /* empty */
 849                 { prefix_attributes = chainon (prefix_attributes, $<ttype>0); }
 850         ;
 851
 852 decl:
 853         typed_declspecs setspecs initdecls ';'
 854                 { current_declspecs = TREE_VALUE (declspec_stack);
 855                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 856                   declspec_stack = TREE_CHAIN (declspec_stack); }
 857         | declmods setspecs notype_initdecls ';'
 858                 { current_declspecs = TREE_VALUE (declspec_stack);
 859                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 860                   declspec_stack = TREE_CHAIN (declspec_stack); }
 861         | typed_declspecs setspecs nested_function
 862                 { current_declspecs = TREE_VALUE (declspec_stack);
 863                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 864                   declspec_stack = TREE_CHAIN (declspec_stack); }
 865         | declmods setspecs notype_nested_function
 866                 { current_declspecs = TREE_VALUE (declspec_stack);
 867                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 868                   declspec_stack = TREE_CHAIN (declspec_stack); }
 869         | typed_declspecs ';'
 870                 { shadow_tag ($1); }
 871         | declmods ';'
 872                 { pedwarn ("empty declaration"); }
 873         | extension decl
 874                 { RESTORE_WARN_FLAGS ($1); }
 875         ;
 876
 877 /* Declspecs which contain at least one type specifier or typedef name.
 878    (Just `const' or `volatile' is not enough.)
 879    A typedef'd name following these is taken as a name to be declared.
 880    Declspecs have a non-NULL TREE_VALUE, attributes do not.  */
 881
 882 typed_declspecs:
 883           typespec reserved_declspecs
 884                 { $$ = tree_cons (NULL_TREE, $1, $2); }
 885         | declmods typespec reserved_declspecs
 886                 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
 887         ;
 888
 889 reserved_declspecs:  /* empty */
 890                 { $$ = NULL_TREE; }
 891         | reserved_declspecs typespecqual_reserved
 892                 { $$ = tree_cons (NULL_TREE, $2, $1); }
 893         | reserved_declspecs SCSPEC
 894                 { if (extra_warnings)
 895                     warning ("`%s' is not at beginning of declaration",
 896                              IDENTIFIER_POINTER ($2));
 897                   $$ = tree_cons (NULL_TREE, $2, $1); }
 898         | reserved_declspecs attributes
 899                 { $$ = tree_cons ($2, NULL_TREE, $1); }
 900         ;
 901
 902 typed_declspecs_no_prefix_attr:
 903           typespec reserved_declspecs_no_prefix_attr
 904                 { $$ = tree_cons (NULL_TREE, $1, $2); }
 905         | declmods_no_prefix_attr typespec reserved_declspecs_no_prefix_attr
 906                 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
 907         ;
 908
 909 reserved_declspecs_no_prefix_attr:
 910           /* empty */
 911                 { $$ = NULL_TREE; }
 912         | reserved_declspecs_no_prefix_attr typespecqual_reserved
 913                 { $$ = tree_cons (NULL_TREE, $2, $1); }
 914         | reserved_declspecs_no_prefix_attr SCSPEC
 915                 { if (extra_warnings)
 916                     warning ("`%s' is not at beginning of declaration",
 917                              IDENTIFIER_POINTER ($2));
 918                   $$ = tree_cons (NULL_TREE, $2, $1); }
 919         ;
 920
 921 /* List of just storage classes, type modifiers, and prefix attributes.
 922    A declaration can start with just this, but then it cannot be used
 923    to redeclare a typedef-name.
 924    Declspecs have a non-NULL TREE_VALUE, attributes do not.  */
 925
 926 declmods:
 927           declmods_no_prefix_attr
 928                 { $$ = $1; }
 929         | attributes
 930                 { $$ = tree_cons ($1, NULL_TREE, NULL_TREE); }
 931         | declmods declmods_no_prefix_attr
 932                 { $$ = chainon ($2, $1); }
 933         | declmods attributes
 934                 { $$ = tree_cons ($2, NULL_TREE, $1); }
 935         ;
 936
 937 declmods_no_prefix_attr:
 938           TYPE_QUAL
 939                 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE);
 940                   TREE_STATIC ($$) = 1; }
 941         | SCSPEC
 942                 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
 943         | declmods_no_prefix_attr TYPE_QUAL
 944                 { $$ = tree_cons (NULL_TREE, $2, $1);
 945                   TREE_STATIC ($$) = 1; }
 946         | declmods_no_prefix_attr SCSPEC
 947                 { if (extra_warnings && TREE_STATIC ($1))
 948                     warning ("`%s' is not at beginning of declaration",
 949                              IDENTIFIER_POINTER ($2));
 950                   $$ = tree_cons (NULL_TREE, $2, $1);
 951                   TREE_STATIC ($$) = TREE_STATIC ($1); }
 952         ;
 953
 954
 955 /* Used instead of declspecs where storage classes are not allowed
 956    (that is, for typenames and structure components).
 957    Don't accept a typedef-name if anything but a modifier precedes it.  */
 958
 959 typed_typespecs:
 960           typespec reserved_typespecquals
 961                 { $$ = tree_cons (NULL_TREE, $1, $2); }
 962         | nonempty_type_quals typespec reserved_typespecquals
 963                 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
 964         ;
 965
 966 reserved_typespecquals:  /* empty */
 967                 { $$ = NULL_TREE; }
 968         | reserved_typespecquals typespecqual_reserved
 969                 { $$ = tree_cons (NULL_TREE, $2, $1); }
 970         ;
 971
 972 /* A typespec (but not a type qualifier).
 973    Once we have seen one of these in a declaration,
 974    if a typedef name appears then it is being redeclared.  */
 975
 976 typespec: TYPESPEC
 977         | structsp
 978         | TYPENAME
 979                 { /* For a typedef name, record the meaning, not the name.
 980                      In case of `foo foo, bar;'.  */
 981                   $$ = lookup_name ($1); }
 982 ifobjc
 983         | CLASSNAME protocolrefs
 984                 { $$ = get_static_reference ($1, $2); }
 985         | OBJECTNAME protocolrefs
 986                 { $$ = get_object_reference ($2); }
 987
 988 /* Make "<SomeProtocol>" equivalent to "id <SomeProtocol>"
 989    - nisse@lysator.liu.se */
 990         | non_empty_protocolrefs
 991                 { $$ = get_object_reference ($1); }
 992 end ifobjc
 993         | TYPEOF '(' expr ')'
 994                 { $$ = TREE_TYPE ($3); }
 995         | TYPEOF '(' typename ')'
 996                 { $$ = groktypename ($3); }
 997         ;
 998
 999 /* A typespec that is a reserved word, or a type qualifier.  */
1000
1001 typespecqual_reserved: TYPESPEC
1002         | TYPE_QUAL
1003         | structsp
1004         ;
1005
1006 initdecls:
1007         initdcl
1008         | initdecls ',' initdcl
1009         ;
1010
1011 notype_initdecls:
1012         notype_initdcl
1013         | notype_initdecls ',' initdcl
1014         ;
1015
1016 maybeasm:
1017           /* empty */
1018                 { $$ = NULL_TREE; }
1019         | ASM_KEYWORD '(' string ')'
1020                 { if (TREE_CHAIN ($3)) $3 = combine_strings ($3);
1021                   $$ = $3;
1022                 }
1023         ;
1024
1025 initdcl:
1026           declarator maybeasm maybe_attribute '='
1027                 { $<ttype>$ = start_decl ($1, current_declspecs, 1,
1028                                           $3, prefix_attributes);
1029                   start_init ($<ttype>$, $2, global_bindings_p ()); }
1030           init
1031 /* Note how the declaration of the variable is in effect while its init is parsed! */
1032                 { finish_init ();
1033                   finish_decl ($<ttype>5, $6, $2); }
1034         | declarator maybeasm maybe_attribute
1035                 { tree d = start_decl ($1, current_declspecs, 0,
1036                                        $3, prefix_attributes);
1037                   finish_decl (d, NULL_TREE, $2);
1038                 }
1039         ;
1040
1041 notype_initdcl:
1042           notype_declarator maybeasm maybe_attribute '='
1043                 { $<ttype>$ = start_decl ($1, current_declspecs, 1,
1044                                           $3, prefix_attributes);
1045                   start_init ($<ttype>$, $2, global_bindings_p ()); }
1046           init
1047 /* Note how the declaration of the variable is in effect while its init is parsed! */
1048                 { finish_init ();
1049                   decl_attributes ($<ttype>5, $3, prefix_attributes);
1050                   finish_decl ($<ttype>5, $6, $2); }
1051         | notype_declarator maybeasm maybe_attribute
1052                 { tree d = start_decl ($1, current_declspecs, 0,
1053                                        $3, prefix_attributes);
1054                   finish_decl (d, NULL_TREE, $2); }
1055         ;
1056 /* the * rules are dummies to accept the Apollo extended syntax
1057    so that the header files compile. */
1058 maybe_attribute:
1059       /* empty */
1060                 { $$ = NULL_TREE; }
1061         | attributes
1062                 { $$ = $1; }
1063         ;
1064
1065 attributes:
1066       attribute
1067                 { $$ = $1; }
1068         | attributes attribute
1069                 { $$ = chainon ($1, $2); }
1070         ;
1071
1072 attribute:
1073       ATTRIBUTE '(' '(' attribute_list ')' ')'
1074                 { $$ = $4; }
1075         ;
1076
1077 attribute_list:
1078       attrib
1079                 { $$ = $1; }
1080         | attribute_list ',' attrib
1081                 { $$ = chainon ($1, $3); }
1082         ;
1083
1084 attrib:
1085     /* empty */
1086                 { $$ = NULL_TREE; }
1087         | any_word
1088                 { $$ = build_tree_list ($1, NULL_TREE); }
1089         | any_word '(' IDENTIFIER ')'
1090                 { $$ = build_tree_list ($1, build_tree_list (NULL_TREE, $3)); }
1091         | any_word '(' IDENTIFIER ',' nonnull_exprlist ')'
1092                 { $$ = build_tree_list ($1, tree_cons (NULL_TREE, $3, $5)); }
1093         | any_word '(' exprlist ')'
1094                 { $$ = build_tree_list ($1, $3); }
1095         ;
1096
1097 /* This still leaves out most reserved keywords,
1098    shouldn't we include them?  */
1099
1100 any_word:
1101           identifier
1102         | SCSPEC
1103         | TYPESPEC
1104         | TYPE_QUAL
1105         ;
1106 \f
1107 /* Initializers.  `init' is the entry point.  */
1108
1109 init:
1110         expr_no_commas
1111         | '{'
1112                 { really_start_incremental_init (NULL_TREE); }
1113           initlist_maybe_comma '}'
1114                 { $$ = pop_init_level (0); }
1115         | error
1116                 { $$ = error_mark_node; }
1117         ;
1118
1119 /* `initlist_maybe_comma' is the guts of an initializer in braces.  */
1120 initlist_maybe_comma:
1121           /* empty */
1122                 { if (pedantic)
1123                     pedwarn ("ISO C forbids empty initializer braces"); }
1124         | initlist1 maybecomma
1125         ;
1126
1127 initlist1:
1128           initelt
1129         | initlist1 ',' initelt
1130         ;
1131
1132 /* `initelt' is a single element of an initializer.
1133    It may use braces.  */
1134 initelt:
1135           designator_list '=' initval
1136                 { if (pedantic && ! flag_isoc99)
1137                     pedwarn ("ISO C89 forbids specifying subobject to initialize"); }
1138         | designator initval
1139                 { if (pedantic)
1140                     pedwarn ("obsolete use of designated initializer without `='"); }
1141         | identifier ':'
1142                 { set_init_label ($1);
1143                   if (pedantic)
1144                     pedwarn ("obsolete use of designated initializer with `:'"); }
1145           initval
1146         | initval
1147         ;
1148
1149 initval:
1150           '{'
1151                 { push_init_level (0); }
1152           initlist_maybe_comma '}'
1153                 { process_init_element (pop_init_level (0)); }
1154         | expr_no_commas
1155                 { process_init_element ($1); }
1156         | error
1157         ;
1158
1159 designator_list:
1160           designator
1161         | designator_list designator
1162         ;
1163
1164 designator:
1165           '.' identifier
1166                 { set_init_label ($2); }
1167         /* These are for labeled elements.  The syntax for an array element
1168            initializer conflicts with the syntax for an Objective-C message,
1169            so don't include these productions in the Objective-C grammar.  */
1170 ifc
1171         | '[' expr_no_commas ELLIPSIS expr_no_commas ']'
1172                 { set_init_index ($2, $4);
1173                   if (pedantic)
1174                     pedwarn ("ISO C forbids specifying range of elements to initialize"); }
1175         | '[' expr_no_commas ']'
1176                 { set_init_index ($2, NULL_TREE); }
1177 end ifc
1178         ;
1179 \f
1180 nested_function:
1181           declarator
1182                 { if (pedantic)
1183                     pedwarn ("ISO C forbids nested functions");
1184
1185                   push_function_context ();
1186                   if (! start_function (current_declspecs, $1,
1187                                         prefix_attributes, NULL_TREE))
1188                     {
1189                       pop_function_context ();
1190                       YYERROR1;
1191                     }
1192                 }
1193            old_style_parm_decls
1194                 { store_parm_decls (); }
1195 /* This used to use compstmt_or_error.
1196    That caused a bug with input `f(g) int g {}',
1197    where the use of YYERROR1 above caused an error
1198    which then was handled by compstmt_or_error.
1199    There followed a repeated execution of that same rule,
1200    which called YYERROR1 again, and so on.  */
1201           save_filename save_lineno compstmt
1202                 { tree decl = current_function_decl;
1203                   DECL_SOURCE_FILE (decl) = $5;
1204                   DECL_SOURCE_LINE (decl) = $6;
1205                   finish_function (1);
1206                   pop_function_context ();
1207                   add_decl_stmt (decl); }
1208         ;
1209
1210 notype_nested_function:
1211           notype_declarator
1212                 { if (pedantic)
1213                     pedwarn ("ISO C forbids nested functions");
1214
1215                   push_function_context ();
1216                   if (! start_function (current_declspecs, $1,
1217                                         prefix_attributes, NULL_TREE))
1218                     {
1219                       pop_function_context ();
1220                       YYERROR1;
1221                     }
1222                 }
1223           old_style_parm_decls
1224                 { store_parm_decls (); }
1225 /* This used to use compstmt_or_error.
1226    That caused a bug with input `f(g) int g {}',
1227    where the use of YYERROR1 above caused an error
1228    which then was handled by compstmt_or_error.
1229    There followed a repeated execution of that same rule,
1230    which called YYERROR1 again, and so on.  */
1231           save_filename save_lineno compstmt
1232                 { tree decl = current_function_decl;
1233                   DECL_SOURCE_FILE (decl) = $5;
1234                   DECL_SOURCE_LINE (decl) = $6;
1235                   finish_function (1);
1236                   pop_function_context ();
1237                   add_decl_stmt (decl); }
1238         ;
1239
1240 /* Any kind of declarator (thus, all declarators allowed
1241    after an explicit typespec).  */
1242
1243 declarator:
1244           after_type_declarator
1245         | notype_declarator
1246         ;
1247
1248 /* A declarator that is allowed only after an explicit typespec.  */
1249
1250 after_type_declarator:
1251           '(' after_type_declarator ')'
1252                 { $$ = $2; }
1253         | after_type_declarator '(' parmlist_or_identifiers  %prec '.'
1254                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1255 /*      | after_type_declarator '(' error ')'  %prec '.'
1256                 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1257                   poplevel (0, 0, 0); }  */
1258         | after_type_declarator '[' expr ']'  %prec '.'
1259                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1260         | after_type_declarator '[' ']'  %prec '.'
1261                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1262         | '*' type_quals after_type_declarator  %prec UNARY
1263                 { $$ = make_pointer_declarator ($2, $3); }
1264         /* ??? Yuck.  setattrs is a quick hack.  We can't use
1265            prefix_attributes because $1 only applies to this
1266            declarator.  We assume setspecs has already been done.
1267            setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1268            attributes could be recognized here or in `attributes').  */
1269         | attributes setattrs after_type_declarator
1270                 { $$ = $3; }
1271         | TYPENAME
1272 ifobjc
1273         | OBJECTNAME
1274 end ifobjc
1275         ;
1276
1277 /* Kinds of declarator that can appear in a parameter list
1278    in addition to notype_declarator.  This is like after_type_declarator
1279    but does not allow a typedef name in parentheses as an identifier
1280    (because it would conflict with a function with that typedef as arg).  */
1281
1282 parm_declarator:
1283           parm_declarator '(' parmlist_or_identifiers  %prec '.'
1284                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1285 /*      | parm_declarator '(' error ')'  %prec '.'
1286                 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1287                   poplevel (0, 0, 0); }  */
1288 ifc
1289         | parm_declarator '[' '*' ']'  %prec '.'
1290                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
1291                   if (! flag_isoc99)
1292                     error ("`[*]' in parameter declaration only allowed in ISO C 99");
1293                 }
1294 end ifc
1295         | parm_declarator '[' expr ']'  %prec '.'
1296                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1297         | parm_declarator '[' ']'  %prec '.'
1298                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1299         | '*' type_quals parm_declarator  %prec UNARY
1300                 { $$ = make_pointer_declarator ($2, $3); }
1301         /* ??? Yuck.  setattrs is a quick hack.  We can't use
1302            prefix_attributes because $1 only applies to this
1303            declarator.  We assume setspecs has already been done.
1304            setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1305            attributes could be recognized here or in `attributes').  */
1306         | attributes setattrs parm_declarator
1307                 { $$ = $3; }
1308         | TYPENAME
1309         ;
1310
1311 /* A declarator allowed whether or not there has been
1312    an explicit typespec.  These cannot redeclare a typedef-name.  */
1313
1314 notype_declarator:
1315           notype_declarator '(' parmlist_or_identifiers  %prec '.'
1316                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1317 /*      | notype_declarator '(' error ')'  %prec '.'
1318                 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1319                   poplevel (0, 0, 0); }  */
1320         | '(' notype_declarator ')'
1321                 { $$ = $2; }
1322         | '*' type_quals notype_declarator  %prec UNARY
1323                 { $$ = make_pointer_declarator ($2, $3); }
1324 ifc
1325         | notype_declarator '[' '*' ']'  %prec '.'
1326                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
1327                   if (! flag_isoc99)
1328                     error ("`[*]' in parameter declaration only allowed in ISO C 99");
1329                 }
1330 end ifc
1331         | notype_declarator '[' expr ']'  %prec '.'
1332                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1333         | notype_declarator '[' ']'  %prec '.'
1334                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1335         /* ??? Yuck.  setattrs is a quick hack.  We can't use
1336            prefix_attributes because $1 only applies to this
1337            declarator.  We assume setspecs has already been done.
1338            setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1339            attributes could be recognized here or in `attributes').  */
1340         | attributes setattrs notype_declarator
1341                 { $$ = $3; }
1342         | IDENTIFIER
1343         ;
1344
1345 struct_head:
1346           STRUCT
1347                 { $$ = NULL_TREE; }
1348         | STRUCT attributes
1349                 { $$ = $2; }
1350         ;
1351
1352 union_head:
1353           UNION
1354                 { $$ = NULL_TREE; }
1355         | UNION attributes
1356                 { $$ = $2; }
1357         ;
1358
1359 enum_head:
1360           ENUM
1361                 { $$ = NULL_TREE; }
1362         | ENUM attributes
1363                 { $$ = $2; }
1364         ;
1365
1366 structsp:
1367           struct_head identifier '{'
1368                 { $$ = start_struct (RECORD_TYPE, $2);
1369                   /* Start scope of tag before parsing components.  */
1370                 }
1371           component_decl_list '}' maybe_attribute
1372                 { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
1373         | struct_head '{' component_decl_list '}' maybe_attribute
1374                 { $$ = finish_struct (start_struct (RECORD_TYPE, NULL_TREE),
1375                                       $3, chainon ($1, $5));
1376                 }
1377         | struct_head identifier
1378                 { $$ = xref_tag (RECORD_TYPE, $2); }
1379         | union_head identifier '{'
1380                 { $$ = start_struct (UNION_TYPE, $2); }
1381           component_decl_list '}' maybe_attribute
1382                 { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
1383         | union_head '{' component_decl_list '}' maybe_attribute
1384                 { $$ = finish_struct (start_struct (UNION_TYPE, NULL_TREE),
1385                                       $3, chainon ($1, $5));
1386                 }
1387         | union_head identifier
1388                 { $$ = xref_tag (UNION_TYPE, $2); }
1389         | enum_head identifier '{'
1390                 { $$ = start_enum ($2); }
1391           enumlist maybecomma_warn '}' maybe_attribute
1392                 { $$ = finish_enum ($<ttype>4, nreverse ($5),
1393                                     chainon ($1, $8)); }
1394         | enum_head '{'
1395                 { $$ = start_enum (NULL_TREE); }
1396           enumlist maybecomma_warn '}' maybe_attribute
1397                 { $$ = finish_enum ($<ttype>3, nreverse ($4),
1398                                     chainon ($1, $7)); }
1399         | enum_head identifier
1400                 { $$ = xref_tag (ENUMERAL_TYPE, $2); }
1401         ;
1402
1403 maybecomma:
1404           /* empty */
1405         | ','
1406         ;
1407
1408 maybecomma_warn:
1409           /* empty */
1410         | ','
1411                 { if (pedantic && ! flag_isoc99)
1412                     pedwarn ("comma at end of enumerator list"); }
1413         ;
1414
1415 component_decl_list:
1416           component_decl_list2
1417                 { $$ = $1; }
1418         | component_decl_list2 component_decl
1419                 { $$ = chainon ($1, $2);
1420                   pedwarn ("no semicolon at end of struct or union"); }
1421         ;
1422
1423 component_decl_list2:   /* empty */
1424                 { $$ = NULL_TREE; }
1425         | component_decl_list2 component_decl ';'
1426                 { $$ = chainon ($1, $2); }
1427         | component_decl_list2 ';'
1428                 { if (pedantic)
1429                     pedwarn ("extra semicolon in struct or union specified"); }
1430 ifobjc
1431         /* foo(sizeof(struct{ @defs(ClassName)})); */
1432         | DEFS '(' CLASSNAME ')'
1433                 {
1434                   tree interface = lookup_interface ($3);
1435
1436                   if (interface)
1437                     $$ = get_class_ivars (interface);
1438                   else
1439                     {
1440                       error ("Cannot find interface declaration for `%s'",
1441                              IDENTIFIER_POINTER ($3));
1442                       $$ = NULL_TREE;
1443                     }
1444                 }
1445 end ifobjc
1446         ;
1447
1448 /* There is a shift-reduce conflict here, because `components' may
1449    start with a `typename'.  It happens that shifting (the default resolution)
1450    does the right thing, because it treats the `typename' as part of
1451    a `typed_typespecs'.
1452
1453    It is possible that this same technique would allow the distinction
1454    between `notype_initdecls' and `initdecls' to be eliminated.
1455    But I am being cautious and not trying it.  */
1456
1457 component_decl:
1458           typed_typespecs setspecs components
1459                 { $$ = $3;
1460                   current_declspecs = TREE_VALUE (declspec_stack);
1461                   prefix_attributes = TREE_PURPOSE (declspec_stack);
1462                   declspec_stack = TREE_CHAIN (declspec_stack); }
1463         | typed_typespecs setspecs save_filename save_lineno maybe_attribute
1464                 {
1465                   /* Support for unnamed structs or unions as members of
1466                      structs or unions (which is [a] useful and [b] supports
1467                      MS P-SDK).  */
1468                   if (pedantic)
1469                     pedwarn ("ISO C doesn't support unnamed structs/unions");
1470
1471                   $$ = grokfield($3, $4, NULL, current_declspecs, NULL_TREE);
1472                   current_declspecs = TREE_VALUE (declspec_stack);
1473                   prefix_attributes = TREE_PURPOSE (declspec_stack);
1474                   declspec_stack = TREE_CHAIN (declspec_stack);
1475                 }
1476     | nonempty_type_quals setspecs components
1477                 { $$ = $3;
1478                   current_declspecs = TREE_VALUE (declspec_stack);
1479                   prefix_attributes = TREE_PURPOSE (declspec_stack);
1480                   declspec_stack = TREE_CHAIN (declspec_stack); }
1481         | nonempty_type_quals
1482                 { if (pedantic)
1483                     pedwarn ("ISO C forbids member declarations with no members");
1484                   shadow_tag($1);
1485                   $$ = NULL_TREE; }
1486         | error
1487                 { $$ = NULL_TREE; }
1488         | extension component_decl
1489                 { $$ = $2;
1490                   RESTORE_WARN_FLAGS ($1); }
1491         ;
1492
1493 components:
1494           component_declarator
1495         | components ',' component_declarator
1496                 { $$ = chainon ($1, $3); }
1497         ;
1498
1499 component_declarator:
1500           save_filename save_lineno declarator maybe_attribute
1501                 { $$ = grokfield ($1, $2, $3, current_declspecs, NULL_TREE);
1502                   decl_attributes ($$, $4, prefix_attributes); }
1503         | save_filename save_lineno
1504           declarator ':' expr_no_commas maybe_attribute
1505                 { $$ = grokfield ($1, $2, $3, current_declspecs, $5);
1506                   decl_attributes ($$, $6, prefix_attributes); }
1507         | save_filename save_lineno ':' expr_no_commas maybe_attribute
1508                 { $$ = grokfield ($1, $2, NULL_TREE, current_declspecs, $4);
1509                   decl_attributes ($$, $5, prefix_attributes); }
1510         ;
1511
1512 /* We chain the enumerators in reverse order.
1513    They are put in forward order where enumlist is used.
1514    (The order used to be significant, but no longer is so.
1515    However, we still maintain the order, just to be clean.)  */
1516
1517 enumlist:
1518           enumerator
1519         | enumlist ',' enumerator
1520                 { if ($1 == error_mark_node)
1521                     $$ = $1;
1522                   else
1523                     $$ = chainon ($3, $1); }
1524         | error
1525                 { $$ = error_mark_node; }
1526         ;
1527
1528
1529 enumerator:
1530           identifier
1531                 { $$ = build_enumerator ($1, NULL_TREE); }
1532         | identifier '=' expr_no_commas
1533                 { $$ = build_enumerator ($1, $3); }
1534         ;
1535
1536 typename:
1537         typed_typespecs absdcl
1538                 { $$ = build_tree_list ($1, $2); }
1539         | nonempty_type_quals absdcl
1540                 { $$ = build_tree_list ($1, $2); }
1541         ;
1542
1543 absdcl:   /* an absolute declarator */
1544         /* empty */
1545                 { $$ = NULL_TREE; }
1546         | absdcl1
1547         ;
1548
1549 nonempty_type_quals:
1550           TYPE_QUAL
1551                 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
1552         | nonempty_type_quals TYPE_QUAL
1553                 { $$ = tree_cons (NULL_TREE, $2, $1); }
1554         ;
1555
1556 type_quals:
1557           /* empty */
1558                 { $$ = NULL_TREE; }
1559         | type_quals TYPE_QUAL
1560                 { $$ = tree_cons (NULL_TREE, $2, $1); }
1561         ;
1562
1563 absdcl1:  /* a nonempty absolute declarator */
1564           '(' absdcl1 ')'
1565                 { $$ = $2; }
1566           /* `(typedef)1' is `int'.  */
1567         | '*' type_quals absdcl1  %prec UNARY
1568                 { $$ = make_pointer_declarator ($2, $3); }
1569         | '*' type_quals  %prec UNARY
1570                 { $$ = make_pointer_declarator ($2, NULL_TREE); }
1571         | absdcl1 '(' parmlist  %prec '.'
1572                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1573         | absdcl1 '[' expr ']'  %prec '.'
1574                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1575         | absdcl1 '[' ']'  %prec '.'
1576                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1577         | '(' parmlist  %prec '.'
1578                 { $$ = build_nt (CALL_EXPR, NULL_TREE, $2, NULL_TREE); }
1579         | '[' expr ']'  %prec '.'
1580                 { $$ = build_nt (ARRAY_REF, NULL_TREE, $2); }
1581         | '[' ']'  %prec '.'
1582                 { $$ = build_nt (ARRAY_REF, NULL_TREE, NULL_TREE); }
1583         /* ??? It appears we have to support attributes here, however
1584            using prefix_attributes is wrong.  */
1585         | attributes setattrs absdcl1
1586                 { $$ = $3; }
1587         ;
1588
1589 /* A nonempty series of declarations and statements (possibly followed by
1590    some labels) that can form the body of a compound statement.
1591    NOTE: we don't allow labels on declarations; this might seem like a
1592    natural extension, but there would be a conflict between attributes
1593    on the label and prefix attributes on the declaration.  */
1594
1595 stmts_and_decls:
1596           lineno_stmt_decl_or_labels_ending_stmt
1597         | lineno_stmt_decl_or_labels_ending_decl
1598         | lineno_stmt_decl_or_labels_ending_label
1599                 {
1600                   pedwarn ("deprecated use of label at end of compound statement");
1601                 }
1602         | lineno_stmt_decl_or_labels_ending_error
1603         ;
1604
1605 lineno_stmt_decl_or_labels_ending_stmt:
1606           lineno_stmt
1607         | lineno_stmt_decl_or_labels_ending_stmt lineno_stmt
1608         | lineno_stmt_decl_or_labels_ending_decl lineno_stmt
1609         | lineno_stmt_decl_or_labels_ending_label lineno_stmt
1610         | lineno_stmt_decl_or_labels_ending_error lineno_stmt
1611         ;
1612
1613 lineno_stmt_decl_or_labels_ending_decl:
1614           lineno_decl
1615         | lineno_stmt_decl_or_labels_ending_stmt lineno_decl
1616                 { if (pedantic && !flag_isoc99)
1617                     pedwarn ("ISO C89 forbids mixed declarations and code"); }
1618         | lineno_stmt_decl_or_labels_ending_decl lineno_decl
1619         | lineno_stmt_decl_or_labels_ending_error lineno_decl
1620         ;
1621
1622 lineno_stmt_decl_or_labels_ending_label:
1623           lineno_label
1624         | lineno_stmt_decl_or_labels_ending_stmt lineno_label
1625         | lineno_stmt_decl_or_labels_ending_decl lineno_label
1626         | lineno_stmt_decl_or_labels_ending_label lineno_label
1627         | lineno_stmt_decl_or_labels_ending_error lineno_label
1628         ;
1629
1630 lineno_stmt_decl_or_labels_ending_error:
1631         errstmt
1632         | lineno_stmt_decl_or_labels errstmt
1633         ;
1634
1635 lineno_stmt_decl_or_labels:
1636           lineno_stmt_decl_or_labels_ending_stmt
1637         | lineno_stmt_decl_or_labels_ending_decl
1638         | lineno_stmt_decl_or_labels_ending_label
1639         | lineno_stmt_decl_or_labels_ending_error
1640         ;
1641
1642 errstmt:  error ';'
1643         ;
1644
1645 pushlevel:  /* empty */
1646                 { pushlevel (0);
1647                   clear_last_expr ();
1648                   add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);
1649 ifobjc
1650                   if (objc_method_context)
1651                     add_objc_decls ();
1652 end ifobjc
1653                 }
1654         ;
1655
1656 poplevel:  /* empty */
1657                 { $$ = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0); }
1658
1659 /* Start and end blocks created for the new scopes of C99.  */
1660 c99_block_start: /* empty */
1661                 { if (flag_isoc99)
1662                     {
1663                       $$ = c_begin_compound_stmt ();
1664                       pushlevel (0);
1665                       clear_last_expr ();
1666                       add_scope_stmt (/*begin_p=*/1, /*partial_p=*/0);
1667 ifobjc
1668                       if (objc_method_context)
1669                         add_objc_decls ();
1670 end ifobjc
1671                     }
1672                   else
1673                     $$ = NULL_TREE;
1674                 }
1675         ;
1676
1677 /* Productions using c99_block_start and c99_block_end will need to do what's
1678    in compstmt: RECHAIN_STMTS ($1, COMPOUND_BODY ($1)); $$ = $2; where
1679    $1 is the value of c99_block_start and $2 of c99_block_end.  */
1680 c99_block_end: /* empty */
1681                 { if (flag_isoc99)
1682                     {
1683                       tree scope_stmt = add_scope_stmt (/*begin_p=*/0, /*partial_p=*/0);
1684                       $$ = poplevel (kept_level_p (), 0, 0);
1685                       SCOPE_STMT_BLOCK (TREE_PURPOSE (scope_stmt))
1686                         = SCOPE_STMT_BLOCK (TREE_VALUE (scope_stmt))
1687                         = $$;
1688                     }
1689                   else
1690                     $$ = NULL_TREE; }
1691         ;
1692
1693 /* Read zero or more forward-declarations for labels
1694    that nested functions can jump to.  */
1695 maybe_label_decls:
1696           /* empty */
1697         | label_decls
1698                 { if (pedantic)
1699                     pedwarn ("ISO C forbids label declarations"); }
1700         ;
1701
1702 label_decls:
1703           label_decl
1704         | label_decls label_decl
1705         ;
1706
1707 label_decl:
1708           LABEL identifiers_or_typenames ';'
1709                 { tree link;
1710                   for (link = $2; link; link = TREE_CHAIN (link))
1711                     {
1712                       tree label = shadow_label (TREE_VALUE (link));
1713                       C_DECLARED_LABEL_FLAG (label) = 1;
1714                       add_decl_stmt (label);
1715                     }
1716                 }
1717         ;
1718
1719 /* This is the body of a function definition.
1720    It causes syntax errors to ignore to the next openbrace.  */
1721 compstmt_or_error:
1722           compstmt
1723                 {}
1724         | error compstmt
1725         ;
1726
1727 compstmt_start: '{' { compstmt_count++;
1728                       $$ = c_begin_compound_stmt (); }
1729
1730 compstmt_nostart: '}'
1731                 { $$ = convert (void_type_node, integer_zero_node); }
1732         | pushlevel maybe_label_decls compstmt_contents_nonempty '}' poplevel
1733                 { $$ = poplevel (kept_level_p (), 1, 0);
1734                   SCOPE_STMT_BLOCK (TREE_PURPOSE ($5))
1735                     = SCOPE_STMT_BLOCK (TREE_VALUE ($5))
1736                     = $$; }
1737         ;
1738
1739 compstmt_contents_nonempty:
1740           stmts_and_decls
1741         | error
1742         ;
1743
1744 compstmt_primary_start:
1745         '(' '{'
1746                 { if (current_function_decl == 0)
1747                     {
1748                       error ("braced-group within expression allowed only inside a function");
1749                       YYERROR;
1750                     }
1751                   /* We must force a BLOCK for this level
1752                      so that, if it is not expanded later,
1753                      there is a way to turn off the entire subtree of blocks
1754                      that are contained in it.  */
1755                   keep_next_level ();
1756                   push_label_level ();
1757                   compstmt_count++;
1758                   $$ = add_stmt (build_stmt (COMPOUND_STMT, last_tree));
1759                 }
1760
1761 compstmt: compstmt_start compstmt_nostart
1762                 { RECHAIN_STMTS ($1, COMPOUND_BODY ($1));
1763                   $$ = $1; }
1764         ;
1765
1766 /* Value is number of statements counted as of the closeparen.  */
1767 simple_if:
1768           if_prefix c99_block_lineno_labeled_stmt
1769                 { c_finish_then (); }
1770 /* Make sure c_expand_end_cond is run once
1771    for each call to c_expand_start_cond.
1772    Otherwise a crash is likely.  */
1773         | if_prefix error
1774         ;
1775
1776 if_prefix:
1777           IF '(' expr ')'
1778                 { c_expand_start_cond (truthvalue_conversion ($3),
1779                                        compstmt_count);
1780                   $<itype>$ = stmt_count;
1781                   if_stmt_file = $<filename>-2;
1782                   if_stmt_line = $<lineno>-1; }
1783         ;
1784
1785 /* This is a subroutine of stmt.
1786    It is used twice, once for valid DO statements
1787    and once for catching errors in parsing the end test.  */
1788 do_stmt_start:
1789           DO
1790                 { stmt_count++;
1791                   compstmt_count++;
1792                   $<ttype>$
1793                     = add_stmt (build_stmt (DO_STMT, NULL_TREE,
1794                                             NULL_TREE));
1795                   /* In the event that a parse error prevents
1796                      parsing the complete do-statement, set the
1797                      condition now.  Otherwise, we can get crashes at
1798                      RTL-generation time.  */
1799                   DO_COND ($<ttype>$) = error_mark_node; }
1800           c99_block_lineno_labeled_stmt WHILE
1801                 { $$ = $<ttype>2;
1802                   RECHAIN_STMTS ($$, DO_BODY ($$)); }
1803         ;
1804
1805 /* The forced readahead in here is because we might be at the end of a
1806    line, and the line and file won't be bumped until yylex absorbs the
1807    first token on the next line.  */
1808 save_filename:
1809                 { if (yychar == YYEMPTY)
1810                     yychar = YYLEX;
1811                   $$ = input_filename; }
1812         ;
1813
1814 save_lineno:
1815                 { if (yychar == YYEMPTY)
1816                     yychar = YYLEX;
1817                   $$ = lineno; }
1818         ;
1819
1820 lineno_labeled_stmt:
1821           lineno_stmt
1822         | lineno_label lineno_labeled_stmt
1823         ;
1824
1825 /* Like lineno_labeled_stmt, but a block in C99.  */
1826 c99_block_lineno_labeled_stmt:
1827           c99_block_start lineno_labeled_stmt c99_block_end
1828                 { if (flag_isoc99)
1829                     RECHAIN_STMTS ($1, COMPOUND_BODY ($1)); }
1830         ;
1831
1832 lineno_stmt:
1833           save_filename save_lineno stmt
1834                 { if ($3)
1835                     {
1836                       STMT_LINENO ($3) = $2;
1837                       /* ??? We currently have no way of recording
1838                          the filename for a statement.  This probably
1839                          matters little in practice at the moment,
1840                          but I suspect that problems will ocurr when
1841                          doing inlining at the tree level.  */
1842                     }
1843                 }
1844         ;
1845
1846 lineno_label:
1847           save_filename save_lineno label
1848                 { if ($3)
1849                     {
1850                       STMT_LINENO ($3) = $2;
1851                     }
1852                 }
1853         ;
1854
1855 select_or_iter_stmt:
1856           simple_if ELSE
1857                 { c_expand_start_else ();
1858                   $<itype>1 = stmt_count; }
1859           c99_block_lineno_labeled_stmt
1860                 { c_finish_else ();
1861                   c_expand_end_cond ();
1862                   if (extra_warnings && stmt_count == $<itype>1)
1863                     warning ("empty body in an else-statement"); }
1864         | simple_if %prec IF
1865                 { c_expand_end_cond ();
1866                   /* This warning is here instead of in simple_if, because we
1867                      do not want a warning if an empty if is followed by an
1868                      else statement.  Increment stmt_count so we don't
1869                      give a second error if this is a nested `if'.  */
1870                   if (extra_warnings && stmt_count++ == $<itype>1)
1871                     warning_with_file_and_line (if_stmt_file, if_stmt_line,
1872                                                 "empty body in an if-statement"); }
1873 /* Make sure c_expand_end_cond is run once
1874    for each call to c_expand_start_cond.
1875    Otherwise a crash is likely.  */
1876         | simple_if ELSE error
1877                 { c_expand_end_cond (); }
1878         | WHILE
1879                 { stmt_count++; }
1880           '(' expr ')'
1881                 { $4 = truthvalue_conversion ($4);
1882                   $<ttype>$
1883                     = add_stmt (build_stmt (WHILE_STMT, $4, NULL_TREE)); }
1884           c99_block_lineno_labeled_stmt
1885                 { RECHAIN_STMTS ($<ttype>6, WHILE_BODY ($<ttype>6)); }
1886         | do_stmt_start
1887           '(' expr ')' ';'
1888                 { DO_COND ($1) = truthvalue_conversion ($3); }
1889         | do_stmt_start error
1890                 { }
1891         | FOR
1892                 { $<ttype>$ = build_stmt (FOR_STMT, NULL_TREE, NULL_TREE,
1893                                           NULL_TREE, NULL_TREE);
1894                   add_stmt ($<ttype>$); }
1895           '(' for_init_stmt
1896                 { stmt_count++;
1897                   RECHAIN_STMTS ($<ttype>2, FOR_INIT_STMT ($<ttype>2)); }
1898           xexpr ';'
1899                 { if ($6)
1900                     FOR_COND ($<ttype>2) = truthvalue_conversion ($6); }
1901           xexpr ')'
1902                 { FOR_EXPR ($<ttype>2) = $9; }
1903           c99_block_lineno_labeled_stmt
1904                 { RECHAIN_STMTS ($<ttype>2, FOR_BODY ($<ttype>2)); }
1905         | SWITCH '(' expr ')'
1906                 { stmt_count++;
1907                   $<ttype>$ = c_start_case ($3); }
1908           c99_block_lineno_labeled_stmt
1909                 { c_finish_case (); }
1910         ;
1911
1912 for_init_stmt:
1913           xexpr ';'
1914                 { add_stmt (build_stmt (EXPR_STMT, $1)); }
1915         | decl
1916                 { check_for_loop_decls (); }
1917         ;
1918
1919 /* Parse a single real statement, not including any labels.  */
1920 stmt:
1921           compstmt
1922                 { stmt_count++; $$ = $1; }
1923         | expr ';'
1924                 { stmt_count++;
1925                   $$ = c_expand_expr_stmt ($1); }
1926         | c99_block_start select_or_iter_stmt c99_block_end
1927                 { if (flag_isoc99)
1928                     RECHAIN_STMTS ($1, COMPOUND_BODY ($1));
1929                   $$ = NULL_TREE; }
1930         | BREAK ';'
1931                 { stmt_count++;
1932                   $$ = add_stmt (build_break_stmt ()); }
1933         | CONTINUE ';'
1934                 { stmt_count++;
1935                   $$ = add_stmt (build_continue_stmt ()); }
1936         | RETURN ';'
1937                 { stmt_count++;
1938                   $$ = c_expand_return (NULL_TREE); }
1939         | RETURN expr ';'
1940                 { stmt_count++;
1941                   $$ = c_expand_return ($2); }
1942         | ASM_KEYWORD maybe_type_qual '(' expr ')' ';'
1943                 { stmt_count++;
1944                   STRIP_NOPS ($4);
1945                   if ((TREE_CODE ($4) == ADDR_EXPR
1946                        && TREE_CODE (TREE_OPERAND ($4, 0)) == STRING_CST)
1947                       || TREE_CODE ($4) == STRING_CST)
1948                     {
1949                       if (TREE_CODE ($4) == ADDR_EXPR)
1950                         $4 = TREE_OPERAND ($4, 0);
1951                       if (TREE_CHAIN ($4))
1952                         $4 = combine_strings ($4);
1953                       $$ = add_stmt (build_stmt (ASM_STMT, NULL_TREE, $4,
1954                                                  NULL_TREE, NULL_TREE,
1955                                                  NULL_TREE));
1956                       ASM_INPUT_P ($$) = 1;
1957                     }
1958                   else
1959                     {
1960                       error ("argument of `asm' is not a constant string");
1961                       $$ = NULL_TREE;
1962                     }
1963                 }
1964         /* This is the case with just output operands.  */
1965         | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ')' ';'
1966                 { stmt_count++;
1967                   $$ = build_asm_stmt ($2, $4, $6, NULL_TREE, NULL_TREE); }
1968         /* This is the case with input operands as well.  */
1969         | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':'
1970           asm_operands ')' ';'
1971                 { stmt_count++;
1972                   $$ = build_asm_stmt ($2, $4, $6, $8, NULL_TREE); }
1973         /* This is the case with clobbered registers as well.  */
1974         | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':'
1975           asm_operands ':' asm_clobbers ')' ';'
1976                 { stmt_count++;
1977                   $$ = build_asm_stmt ($2, $4, $6, $8, $10); }
1978         | GOTO identifier ';'
1979                 { tree decl;
1980                   stmt_count++;
1981                   decl = lookup_label ($2);
1982                   if (decl != 0)
1983                     {
1984                       TREE_USED (decl) = 1;
1985                       $$ = add_stmt (build_stmt (GOTO_STMT, decl));
1986                     }
1987                   else
1988                     $$ = NULL_TREE;
1989                 }
1990         | GOTO '*' expr ';'
1991                 { if (pedantic)
1992                     pedwarn ("ISO C forbids `goto *expr;'");
1993                   stmt_count++;
1994                   $3 = convert (ptr_type_node, $3);
1995                   $$ = add_stmt (build_stmt (GOTO_STMT, $3)); }
1996         | ';'
1997                 { $$ = NULL_TREE; }
1998         ;
1999
2000 /* Any kind of label, including jump labels and case labels.
2001    ANSI C accepts labels only before statements, but we allow them
2002    also at the end of a compound statement.  */
2003
2004 label:    CASE expr_no_commas ':'
2005                 { stmt_count++;
2006                   $$ = do_case ($2, NULL_TREE); }
2007         | CASE expr_no_commas ELLIPSIS expr_no_commas ':'
2008                 { stmt_count++;
2009                   $$ = do_case ($2, $4); }
2010         | DEFAULT ':'
2011                 { stmt_count++;
2012                   $$ = do_case (NULL_TREE, NULL_TREE); }
2013         | identifier save_filename save_lineno ':' maybe_attribute
2014                 { tree label = define_label ($2, $3, $1);
2015                   stmt_count++;
2016                   if (label)
2017                     {
2018                       decl_attributes (label, $5, NULL_TREE);
2019                       $$ = add_stmt (build_stmt (LABEL_STMT, label));
2020                     }
2021                   else
2022                     $$ = NULL_TREE;
2023                 }
2024         ;
2025
2026 /* Either a type-qualifier or nothing.  First thing in an `asm' statement.  */
2027
2028 maybe_type_qual:
2029         /* empty */
2030                 { emit_line_note (input_filename, lineno);
2031                   $$ = NULL_TREE; }
2032         | TYPE_QUAL
2033                 { emit_line_note (input_filename, lineno); }
2034         ;
2035
2036 xexpr:
2037         /* empty */
2038                 { $$ = NULL_TREE; }
2039         | expr
2040         ;
2041
2042 /* These are the operands other than the first string and colon
2043    in  asm ("addextend %2,%1": "=dm" (x), "0" (y), "g" (*x))  */
2044 asm_operands: /* empty */
2045                 { $$ = NULL_TREE; }
2046         | nonnull_asm_operands
2047         ;
2048
2049 nonnull_asm_operands:
2050           asm_operand
2051         | nonnull_asm_operands ',' asm_operand
2052                 { $$ = chainon ($1, $3); }
2053         ;
2054
2055 asm_operand:
2056           STRING '(' expr ')'
2057                 { $$ = build_tree_list ($1, $3); }
2058         ;
2059
2060 asm_clobbers:
2061           string
2062                 { $$ = tree_cons (NULL_TREE, combine_strings ($1), NULL_TREE); }
2063         | asm_clobbers ',' string
2064                 { $$ = tree_cons (NULL_TREE, combine_strings ($3), $1); }
2065         ;
2066 \f
2067 /* This is what appears inside the parens in a function declarator.
2068    Its value is a list of ..._TYPE nodes.  */
2069 parmlist:
2070                 { pushlevel (0);
2071                   clear_parm_order ();
2072                   declare_parm_level (0); }
2073           parmlist_1
2074                 { $$ = $2;
2075                   parmlist_tags_warning ();
2076                   poplevel (0, 0, 0); }
2077         ;
2078
2079 parmlist_1:
2080           parmlist_2 ')'
2081         | parms ';'
2082                 { tree parm;
2083                   if (pedantic)
2084                     pedwarn ("ISO C forbids forward parameter declarations");
2085                   /* Mark the forward decls as such.  */
2086                   for (parm = getdecls (); parm; parm = TREE_CHAIN (parm))
2087                     TREE_ASM_WRITTEN (parm) = 1;
2088                   clear_parm_order (); }
2089           parmlist_1
2090                 { $$ = $4; }
2091         | error ')'
2092                 { $$ = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); }
2093         ;
2094
2095 /* This is what appears inside the parens in a function declarator.
2096    Is value is represented in the format that grokdeclarator expects.  */
2097 parmlist_2:  /* empty */
2098                 { $$ = get_parm_info (0); }
2099         | ELLIPSIS
2100                 { $$ = get_parm_info (0);
2101                   /* Gcc used to allow this as an extension.  However, it does
2102                      not work for all targets, and thus has been disabled.
2103                      Also, since func (...) and func () are indistinguishable,
2104                      it caused problems with the code in expand_builtin which
2105                      tries to verify that BUILT_IN_NEXT_ARG is being used
2106                      correctly.  */
2107                   error ("ISO C requires a named argument before `...'");
2108                 }
2109         | parms
2110                 { $$ = get_parm_info (1); }
2111         | parms ',' ELLIPSIS
2112                 { $$ = get_parm_info (0); }
2113         ;
2114
2115 parms:
2116         parm
2117                 { push_parm_decl ($1); }
2118         | parms ',' parm
2119                 { push_parm_decl ($3); }
2120         ;
2121
2122 /* A single parameter declaration or parameter type name,
2123    as found in a parmlist.  */
2124 parm:
2125           typed_declspecs setspecs parm_declarator maybe_attribute
2126                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2127                                                          $3),
2128                                         build_tree_list (prefix_attributes,
2129                                                          $4));
2130                   current_declspecs = TREE_VALUE (declspec_stack);
2131                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2132                   declspec_stack = TREE_CHAIN (declspec_stack); }
2133         | typed_declspecs setspecs notype_declarator maybe_attribute
2134                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2135                                                          $3),
2136                                         build_tree_list (prefix_attributes,
2137                                                          $4));
2138                   current_declspecs = TREE_VALUE (declspec_stack);
2139                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2140                   declspec_stack = TREE_CHAIN (declspec_stack); }
2141         | typed_declspecs setspecs absdcl maybe_attribute
2142                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2143                                                          $3),
2144                                         build_tree_list (prefix_attributes,
2145                                                          $4));
2146                   current_declspecs = TREE_VALUE (declspec_stack);
2147                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2148                   declspec_stack = TREE_CHAIN (declspec_stack); }
2149         | declmods setspecs notype_declarator maybe_attribute
2150                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2151                                                          $3),
2152                                         build_tree_list (prefix_attributes,
2153                                                          $4));
2154                   current_declspecs = TREE_VALUE (declspec_stack);
2155                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2156                   declspec_stack = TREE_CHAIN (declspec_stack); }
2157
2158         | declmods setspecs absdcl maybe_attribute
2159                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2160                                                          $3),
2161                                         build_tree_list (prefix_attributes,
2162                                                          $4));
2163                   current_declspecs = TREE_VALUE (declspec_stack);
2164                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2165                   declspec_stack = TREE_CHAIN (declspec_stack); }
2166         ;
2167
2168 /* This is used in a function definition
2169    where either a parmlist or an identifier list is ok.
2170    Its value is a list of ..._TYPE nodes or a list of identifiers.  */
2171 parmlist_or_identifiers:
2172                 { pushlevel (0);
2173                   clear_parm_order ();
2174                   declare_parm_level (1); }
2175           parmlist_or_identifiers_1
2176                 { $$ = $2;
2177                   parmlist_tags_warning ();
2178                   poplevel (0, 0, 0); }
2179         ;
2180
2181 parmlist_or_identifiers_1:
2182           parmlist_1
2183         | identifiers ')'
2184                 { tree t;
2185                   for (t = $1; t; t = TREE_CHAIN (t))
2186                     if (TREE_VALUE (t) == NULL_TREE)
2187                       error ("`...' in old-style identifier list");
2188                   $$ = tree_cons (NULL_TREE, NULL_TREE, $1); }
2189         ;
2190
2191 /* A nonempty list of identifiers.  */
2192 identifiers:
2193         IDENTIFIER
2194                 { $$ = build_tree_list (NULL_TREE, $1); }
2195         | identifiers ',' IDENTIFIER
2196                 { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
2197         ;
2198
2199 /* A nonempty list of identifiers, including typenames.  */
2200 identifiers_or_typenames:
2201         identifier
2202                 { $$ = build_tree_list (NULL_TREE, $1); }
2203         | identifiers_or_typenames ',' identifier
2204                 { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
2205         ;
2206
2207 extension:
2208         EXTENSION
2209                 { $$ = SAVE_WARN_FLAGS();
2210                   pedantic = 0;
2211                   warn_pointer_arith = 0; }
2212         ;
2213 \f
2214 ifobjc
2215 /* Objective-C productions.  */
2216
2217 objcdef:
2218           classdef
2219         | classdecl
2220         | aliasdecl
2221         | protocoldef
2222         | methoddef
2223         | END
2224                 {
2225                   if (objc_implementation_context)
2226                     {
2227                       finish_class (objc_implementation_context);
2228                       objc_ivar_chain = NULL_TREE;
2229                       objc_implementation_context = NULL_TREE;
2230                     }
2231                   else
2232                     warning ("`@end' must appear in an implementation context");
2233                 }
2234         ;
2235
2236 /* A nonempty list of identifiers.  */
2237 identifier_list:
2238         identifier
2239                 { $$ = build_tree_list (NULL_TREE, $1); }
2240         | identifier_list ',' identifier
2241                 { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
2242         ;
2243
2244 classdecl:
2245           CLASS identifier_list ';'
2246                 {
2247                   objc_declare_class ($2);
2248                 }
2249
2250 aliasdecl:
2251           ALIAS identifier identifier ';'
2252                 {
2253                   objc_declare_alias ($2, $3);
2254                 }
2255
2256 classdef:
2257           INTERFACE identifier protocolrefs '{'
2258                 {
2259                   objc_interface_context = objc_ivar_context
2260                     = start_class (CLASS_INTERFACE_TYPE, $2, NULL_TREE, $3);
2261                   objc_public_flag = 0;
2262                 }
2263           ivar_decl_list '}'
2264                 {
2265                   continue_class (objc_interface_context);
2266                 }
2267           methodprotolist
2268           END
2269                 {
2270                   finish_class (objc_interface_context);
2271                   objc_interface_context = NULL_TREE;
2272                 }
2273
2274         | INTERFACE identifier protocolrefs
2275                 {
2276                   objc_interface_context
2277                     = start_class (CLASS_INTERFACE_TYPE, $2, NULL_TREE, $3);
2278                   continue_class (objc_interface_context);
2279                 }
2280           methodprotolist
2281           END
2282                 {
2283                   finish_class (objc_interface_context);
2284                   objc_interface_context = NULL_TREE;
2285                 }
2286
2287         | INTERFACE identifier ':' identifier protocolrefs '{'
2288                 {
2289                   objc_interface_context = objc_ivar_context
2290                     = start_class (CLASS_INTERFACE_TYPE, $2, $4, $5);
2291                   objc_public_flag = 0;
2292                 }
2293           ivar_decl_list '}'
2294                 {
2295                   continue_class (objc_interface_context);
2296                 }
2297           methodprotolist
2298           END
2299                 {
2300                   finish_class (objc_interface_context);
2301                   objc_interface_context = NULL_TREE;
2302                 }
2303
2304         | INTERFACE identifier ':' identifier protocolrefs
2305                 {
2306                   objc_interface_context
2307                     = start_class (CLASS_INTERFACE_TYPE, $2, $4, $5);
2308                   continue_class (objc_interface_context);
2309                 }
2310           methodprotolist
2311           END
2312                 {
2313                   finish_class (objc_interface_context);
2314                   objc_interface_context = NULL_TREE;
2315                 }
2316
2317         | IMPLEMENTATION identifier '{'
2318                 {
2319                   objc_implementation_context = objc_ivar_context
2320                     = start_class (CLASS_IMPLEMENTATION_TYPE, $2, NULL_TREE, NULL_TREE);
2321                   objc_public_flag = 0;
2322                 }
2323           ivar_decl_list '}'
2324                 {
2325                   objc_ivar_chain
2326                     = continue_class (objc_implementation_context);
2327                 }
2328
2329         | IMPLEMENTATION identifier
2330                 {
2331                   objc_implementation_context
2332                     = start_class (CLASS_IMPLEMENTATION_TYPE, $2, NULL_TREE, NULL_TREE);
2333                   objc_ivar_chain
2334                     = continue_class (objc_implementation_context);
2335                 }
2336
2337         | IMPLEMENTATION identifier ':' identifier '{'
2338                 {
2339                   objc_implementation_context = objc_ivar_context
2340                     = start_class (CLASS_IMPLEMENTATION_TYPE, $2, $4, NULL_TREE);
2341                   objc_public_flag = 0;
2342                 }
2343           ivar_decl_list '}'
2344                 {
2345                   objc_ivar_chain
2346                     = continue_class (objc_implementation_context);
2347                 }
2348
2349         | IMPLEMENTATION identifier ':' identifier
2350                 {
2351                   objc_implementation_context
2352                     = start_class (CLASS_IMPLEMENTATION_TYPE, $2, $4, NULL_TREE);
2353                   objc_ivar_chain
2354                     = continue_class (objc_implementation_context);
2355                 }
2356
2357         | INTERFACE identifier '(' identifier ')' protocolrefs
2358                 {
2359                   objc_interface_context
2360                     = start_class (CATEGORY_INTERFACE_TYPE, $2, $4, $6);
2361                   continue_class (objc_interface_context);
2362                 }
2363           methodprotolist
2364           END
2365                 {
2366                   finish_class (objc_interface_context);
2367                   objc_interface_context = NULL_TREE;
2368                 }
2369
2370         | IMPLEMENTATION identifier '(' identifier ')'
2371                 {
2372                   objc_implementation_context
2373                     = start_class (CATEGORY_IMPLEMENTATION_TYPE, $2, $4, NULL_TREE);
2374                   objc_ivar_chain
2375                     = continue_class (objc_implementation_context);
2376                 }
2377         ;
2378
2379 protocoldef:
2380           PROTOCOL identifier protocolrefs
2381                 {
2382                   remember_protocol_qualifiers ();
2383                   objc_interface_context
2384                     = start_protocol(PROTOCOL_INTERFACE_TYPE, $2, $3);
2385                 }
2386           methodprotolist END
2387                 {
2388                   forget_protocol_qualifiers();
2389                   finish_protocol(objc_interface_context);
2390                   objc_interface_context = NULL_TREE;
2391                 }
2392         ;
2393
2394 protocolrefs:
2395           /* empty */
2396                 {
2397                   $$ = NULL_TREE;
2398                 }
2399         | non_empty_protocolrefs
2400         ;
2401
2402 non_empty_protocolrefs:
2403           ARITHCOMPARE identifier_list ARITHCOMPARE
2404                 {
2405                   if ($1 == LT_EXPR && $3 == GT_EXPR)
2406                     $$ = $2;
2407                   else
2408                     YYERROR1;
2409                 }
2410         ;
2411
2412 ivar_decl_list:
2413           ivar_decl_list visibility_spec ivar_decls
2414         | ivar_decls
2415         ;
2416
2417 visibility_spec:
2418           PRIVATE { objc_public_flag = 2; }
2419         | PROTECTED { objc_public_flag = 0; }
2420         | PUBLIC { objc_public_flag = 1; }
2421         ;
2422
2423 ivar_decls:
2424           /* empty */
2425                 {
2426                   $$ = NULL_TREE;
2427                 }
2428         | ivar_decls ivar_decl ';'
2429         | ivar_decls ';'
2430                 {
2431                   if (pedantic)
2432                     pedwarn ("extra semicolon in struct or union specified");
2433                 }
2434         ;
2435
2436
2437 /* There is a shift-reduce conflict here, because `components' may
2438    start with a `typename'.  It happens that shifting (the default resolution)
2439    does the right thing, because it treats the `typename' as part of
2440    a `typed_typespecs'.
2441
2442    It is possible that this same technique would allow the distinction
2443    between `notype_initdecls' and `initdecls' to be eliminated.
2444    But I am being cautious and not trying it.  */
2445
2446 ivar_decl:
2447         typed_typespecs setspecs ivars
2448                 { $$ = $3;
2449                   current_declspecs = TREE_VALUE (declspec_stack);
2450                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2451                   declspec_stack = TREE_CHAIN (declspec_stack); }
2452         | nonempty_type_quals setspecs ivars
2453                 { $$ = $3;
2454                   current_declspecs = TREE_VALUE (declspec_stack);
2455                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2456                   declspec_stack = TREE_CHAIN (declspec_stack); }
2457         | error
2458                 { $$ = NULL_TREE; }
2459         ;
2460
2461 ivars:
2462           /* empty */
2463                 { $$ = NULL_TREE; }
2464         | ivar_declarator
2465         | ivars ',' ivar_declarator
2466         ;
2467
2468 ivar_declarator:
2469           declarator
2470                 {
2471                   $$ = add_instance_variable (objc_ivar_context,
2472                                               objc_public_flag,
2473                                               $1, current_declspecs,
2474                                               NULL_TREE);
2475                 }
2476         | declarator ':' expr_no_commas
2477                 {
2478                   $$ = add_instance_variable (objc_ivar_context,
2479                                               objc_public_flag,
2480                                               $1, current_declspecs, $3);
2481                 }
2482         | ':' expr_no_commas
2483                 {
2484                   $$ = add_instance_variable (objc_ivar_context,
2485                                               objc_public_flag,
2486                                               NULL_TREE,
2487                                               current_declspecs, $2);
2488                 }
2489         ;
2490
2491 methoddef:
2492           '+'
2493                 {
2494                   remember_protocol_qualifiers ();
2495                   if (objc_implementation_context)
2496                     objc_inherit_code = CLASS_METHOD_DECL;
2497                   else
2498                     fatal ("method definition not in class context");
2499                 }
2500           methoddecl
2501                 {
2502                   forget_protocol_qualifiers ();
2503                   add_class_method (objc_implementation_context, $3);
2504                   start_method_def ($3);
2505                   objc_method_context = $3;
2506                 }
2507           optarglist
2508                 {
2509                   continue_method_def ();
2510                 }
2511           compstmt_or_error
2512                 {
2513                   finish_method_def ();
2514                   objc_method_context = NULL_TREE;
2515                 }
2516
2517         | '-'
2518                 {
2519                   remember_protocol_qualifiers ();
2520                   if (objc_implementation_context)
2521                     objc_inherit_code = INSTANCE_METHOD_DECL;
2522                   else
2523                     fatal ("method definition not in class context");
2524                 }
2525           methoddecl
2526                 {
2527                   forget_protocol_qualifiers ();
2528                   add_instance_method (objc_implementation_context, $3);
2529                   start_method_def ($3);
2530                   objc_method_context = $3;
2531                 }
2532           optarglist
2533                 {
2534                   continue_method_def ();
2535                 }
2536           compstmt_or_error
2537                 {
2538                   finish_method_def ();
2539                   objc_method_context = NULL_TREE;
2540                 }
2541         ;
2542
2543 /* the reason for the strange actions in this rule
2544  is so that notype_initdecls when reached via datadef
2545  can find a valid list of type and sc specs in $0. */
2546
2547 methodprotolist:
2548           /* empty  */
2549         | {$<ttype>$ = NULL_TREE; } methodprotolist2
2550         ;
2551
2552 methodprotolist2:                /* eliminates a shift/reduce conflict */
2553            methodproto
2554         |  datadef
2555         | methodprotolist2 methodproto
2556         | methodprotolist2 {$<ttype>$ = NULL_TREE; } datadef
2557         ;
2558
2559 semi_or_error:
2560           ';'
2561         | error
2562         ;
2563
2564 methodproto:
2565           '+'
2566                 {
2567                   /* Remember protocol qualifiers in prototypes.  */
2568                   remember_protocol_qualifiers ();
2569                   objc_inherit_code = CLASS_METHOD_DECL;
2570                 }
2571           methoddecl
2572                 {
2573                   /* Forget protocol qualifiers here.  */
2574                   forget_protocol_qualifiers ();
2575                   add_class_method (objc_interface_context, $3);
2576                 }
2577           semi_or_error
2578
2579         | '-'
2580                 {
2581                   /* Remember protocol qualifiers in prototypes.  */
2582                   remember_protocol_qualifiers ();
2583                   objc_inherit_code = INSTANCE_METHOD_DECL;
2584                 }
2585           methoddecl
2586                 {
2587                   /* Forget protocol qualifiers here.  */
2588                   forget_protocol_qualifiers ();
2589                   add_instance_method (objc_interface_context, $3);
2590                 }
2591           semi_or_error
2592         ;
2593
2594 methoddecl:
2595           '(' typename ')' unaryselector
2596                 {
2597                   $$ = build_method_decl (objc_inherit_code, $2, $4, NULL_TREE);
2598                 }
2599
2600         | unaryselector
2601                 {
2602                   $$ = build_method_decl (objc_inherit_code, NULL_TREE, $1, NULL_TREE);
2603                 }
2604
2605         | '(' typename ')' keywordselector optparmlist
2606                 {
2607                   $$ = build_method_decl (objc_inherit_code, $2, $4, $5);
2608                 }
2609
2610         | keywordselector optparmlist
2611                 {
2612                   $$ = build_method_decl (objc_inherit_code, NULL_TREE, $1, $2);
2613                 }
2614         ;
2615
2616 /* "optarglist" assumes that start_method_def has already been called...
2617    if it is not, the "xdecls" will not be placed in the proper scope */
2618
2619 optarglist:
2620           /* empty */
2621         | ';' myxdecls
2622         ;
2623
2624 /* to get around the following situation: "int foo (int a) int b; {}" that
2625    is synthesized when parsing "- a:a b:b; id c; id d; { ... }" */
2626
2627 myxdecls:
2628           /* empty */
2629         | mydecls
2630         ;
2631
2632 mydecls:
2633         mydecl
2634         | errstmt
2635         | mydecls mydecl
2636         | mydecl errstmt
2637         ;
2638
2639 mydecl:
2640         typed_declspecs setspecs myparms ';'
2641                 { current_declspecs = TREE_VALUE (declspec_stack);
2642                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2643                   declspec_stack = TREE_CHAIN (declspec_stack); }
2644         | typed_declspecs ';'
2645                 { shadow_tag ($1); }
2646         | declmods ';'
2647                 { pedwarn ("empty declaration"); }
2648         ;
2649
2650 myparms:
2651         myparm
2652                 { push_parm_decl ($1); }
2653         | myparms ',' myparm
2654                 { push_parm_decl ($3); }
2655         ;
2656
2657 /* A single parameter declaration or parameter type name,
2658    as found in a parmlist. DOES NOT ALLOW AN INITIALIZER OR ASMSPEC */
2659
2660 myparm:
2661           parm_declarator maybe_attribute
2662                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2663                                                          $1),
2664                                         build_tree_list (prefix_attributes,
2665                                                          $2)); }
2666         | notype_declarator maybe_attribute
2667                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2668                                                          $1),
2669                                         build_tree_list (prefix_attributes,
2670                                                          $2)); }
2671         | absdcl maybe_attribute
2672                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2673                                                          $1),
2674                                         build_tree_list (prefix_attributes,
2675                                                          $2)); }
2676         ;
2677
2678 optparmlist:
2679           /* empty */
2680                 {
2681                   $$ = NULL_TREE;
2682                 }
2683         | ',' ELLIPSIS
2684                 {
2685                   /* oh what a kludge! */
2686                   $$ = objc_ellipsis_node;
2687                 }
2688         | ','
2689                 {
2690                   pushlevel (0);
2691                 }
2692           parmlist_2
2693                 {
2694                   /* returns a tree list node generated by get_parm_info */
2695                   $$ = $3;
2696                   poplevel (0, 0, 0);
2697                 }
2698         ;
2699
2700 unaryselector:
2701           selector
2702         ;
2703
2704 keywordselector:
2705           keyworddecl
2706
2707         | keywordselector keyworddecl
2708                 {
2709                   $$ = chainon ($1, $2);
2710                 }
2711         ;
2712
2713 selector:
2714           IDENTIFIER
2715         | TYPENAME
2716         | OBJECTNAME
2717         | reservedwords
2718         ;
2719
2720 reservedwords:
2721           ENUM | STRUCT | UNION | IF | ELSE | WHILE | DO | FOR
2722         | SWITCH | CASE | DEFAULT | BREAK | CONTINUE | RETURN
2723         | GOTO | ASM_KEYWORD | SIZEOF | TYPEOF | ALIGNOF
2724         | TYPESPEC | TYPE_QUAL
2725         ;
2726
2727 keyworddecl:
2728           selector ':' '(' typename ')' identifier
2729                 {
2730                   $$ = build_keyword_decl ($1, $4, $6);
2731                 }
2732
2733         | selector ':' identifier
2734                 {
2735                   $$ = build_keyword_decl ($1, NULL_TREE, $3);
2736                 }
2737
2738         | ':' '(' typename ')' identifier
2739                 {
2740                   $$ = build_keyword_decl (NULL_TREE, $3, $5);
2741                 }
2742
2743         | ':' identifier
2744                 {
2745                   $$ = build_keyword_decl (NULL_TREE, NULL_TREE, $2);
2746                 }
2747         ;
2748
2749 messageargs:
2750           selector
2751         | keywordarglist
2752         ;
2753
2754 keywordarglist:
2755           keywordarg
2756         | keywordarglist keywordarg
2757                 {
2758                   $$ = chainon ($1, $2);
2759                 }
2760         ;
2761
2762
2763 keywordexpr:
2764           nonnull_exprlist
2765                 {
2766                   if (TREE_CHAIN ($1) == NULL_TREE)
2767                     /* just return the expr., remove a level of indirection */
2768                     $$ = TREE_VALUE ($1);
2769                   else
2770                     /* we have a comma expr., we will collapse later */
2771                     $$ = $1;
2772                 }
2773         ;
2774
2775 keywordarg:
2776           selector ':' keywordexpr
2777                 {
2778                   $$ = build_tree_list ($1, $3);
2779                 }
2780         | ':' keywordexpr
2781                 {
2782                   $$ = build_tree_list (NULL_TREE, $2);
2783                 }
2784         ;
2785
2786 receiver:
2787           expr
2788         | CLASSNAME
2789                 {
2790                   $$ = get_class_reference ($1);
2791                 }
2792         ;
2793
2794 objcmessageexpr:
2795           '['
2796                 { objc_receiver_context = 1; }
2797           receiver
2798                 { objc_receiver_context = 0; }
2799           messageargs ']'
2800                 {
2801                   $$ = build_tree_list ($3, $5);
2802                 }
2803         ;
2804
2805 selectorarg:
2806           selector
2807         | keywordnamelist
2808         ;
2809
2810 keywordnamelist:
2811           keywordname
2812         | keywordnamelist keywordname
2813                 {
2814                   $$ = chainon ($1, $2);
2815                 }
2816         ;
2817
2818 keywordname:
2819           selector ':'
2820                 {
2821                   $$ = build_tree_list ($1, NULL_TREE);
2822                 }
2823         | ':'
2824                 {
2825                   $$ = build_tree_list (NULL_TREE, NULL_TREE);
2826                 }
2827         ;
2828
2829 objcselectorexpr:
2830           SELECTOR '(' selectorarg ')'
2831                 {
2832                   $$ = $3;
2833                 }
2834         ;
2835
2836 objcprotocolexpr:
2837           PROTOCOL '(' identifier ')'
2838                 {
2839                   $$ = $3;
2840                 }
2841         ;
2842
2843 /* extension to support C-structures in the archiver */
2844
2845 objcencodeexpr:
2846           ENCODE '(' typename ')'
2847                 {
2848                   $$ = groktypename ($3);
2849                 }
2850         ;
2851
2852 end ifobjc
2853 %%
2854
2855 /* yylex() is a thin wrapper around c_lex(), all it does is translate
2856    cpplib.h's token codes into yacc's token codes.  */
2857
2858 static enum cpp_ttype last_token;
2859
2860 /* The reserved keyword table.  */
2861 struct resword
2862 {
2863   const char *word;
2864   ENUM_BITFIELD(rid) rid : 16;
2865   unsigned int disable   : 16;
2866 };
2867
2868 /* Disable mask.  Keywords are disabled if (reswords[i].disable & mask) is
2869    _true_.  */
2870 #define D_TRAD  0x01    /* not in traditional C */
2871 #define D_C89   0x02    /* not in C89 */
2872 #define D_EXT   0x04    /* GCC extension */
2873 #define D_EXT89 0x08    /* GCC extension incorporated in C99 */
2874 #define D_OBJC  0x10    /* Objective C only */
2875 #define D_YES   0x20    /* always starts disabled */
2876
2877 static const struct resword reswords[] =
2878 {
2879   { "_Bool",            RID_BOOL,       0 },
2880   { "_Complex",         RID_COMPLEX,    0 },
2881   { "__alignof",        RID_ALIGNOF,    0 },
2882   { "__alignof__",      RID_ALIGNOF,    0 },
2883   { "__asm",            RID_ASM,        0 },
2884   { "__asm__",          RID_ASM,        0 },
2885   { "__attribute",      RID_ATTRIBUTE,  0 },
2886   { "__attribute__",    RID_ATTRIBUTE,  0 },
2887   { "__bounded",        RID_BOUNDED,    0 },
2888   { "__bounded__",      RID_BOUNDED,    0 },
2889   { "__builtin_va_arg", RID_VA_ARG,     0 },
2890   { "__complex",        RID_COMPLEX,    0 },
2891   { "__complex__",      RID_COMPLEX,    0 },
2892   { "__const",          RID_CONST,      0 },
2893   { "__const__",        RID_CONST,      0 },
2894   { "__extension__",    RID_EXTENSION,  0 },
2895   { "__imag",           RID_IMAGPART,   0 },
2896   { "__imag__",         RID_IMAGPART,   0 },
2897   { "__inline",         RID_INLINE,     0 },
2898   { "__inline__",       RID_INLINE,     0 },
2899   { "__label__",        RID_LABEL,      0 },
2900   { "__ptrbase",        RID_PTRBASE,    0 },
2901   { "__ptrbase__",      RID_PTRBASE,    0 },
2902   { "__ptrextent",      RID_PTREXTENT,  0 },
2903   { "__ptrextent__",    RID_PTREXTENT,  0 },
2904   { "__ptrvalue",       RID_PTRVALUE,   0 },
2905   { "__ptrvalue__",     RID_PTRVALUE,   0 },
2906   { "__real",           RID_REALPART,   0 },
2907   { "__real__",         RID_REALPART,   0 },
2908   { "__restrict",       RID_RESTRICT,   0 },
2909   { "__restrict__",     RID_RESTRICT,   0 },
2910   { "__signed",         RID_SIGNED,     0 },
2911   { "__signed__",       RID_SIGNED,     0 },
2912   { "__typeof",         RID_TYPEOF,     0 },
2913   { "__typeof__",       RID_TYPEOF,     0 },
2914   { "__unbounded",      RID_UNBOUNDED,  0 },
2915   { "__unbounded__",    RID_UNBOUNDED,  0 },
2916   { "__volatile",       RID_VOLATILE,   0 },
2917   { "__volatile__",     RID_VOLATILE,   0 },
2918   { "asm",              RID_ASM,        D_EXT },
2919   { "auto",             RID_AUTO,       0 },
2920   { "break",            RID_BREAK,      0 },
2921   { "case",             RID_CASE,       0 },
2922   { "char",             RID_CHAR,       0 },
2923   { "const",            RID_CONST,      D_TRAD },
2924   { "continue",         RID_CONTINUE,   0 },
2925   { "default",          RID_DEFAULT,    0 },
2926   { "do",               RID_DO,         0 },
2927   { "double",           RID_DOUBLE,     0 },
2928   { "else",             RID_ELSE,       0 },
2929   { "enum",             RID_ENUM,       0 },
2930   { "extern",           RID_EXTERN,     0 },
2931   { "float",            RID_FLOAT,      0 },
2932   { "for",              RID_FOR,        0 },
2933   { "goto",             RID_GOTO,       0 },
2934   { "if",               RID_IF,         0 },
2935   { "inline",           RID_INLINE,     D_TRAD|D_EXT89 },
2936   { "int",              RID_INT,        0 },
2937   { "long",             RID_LONG,       0 },
2938   { "register",         RID_REGISTER,   0 },
2939   { "restrict",         RID_RESTRICT,   D_TRAD|D_C89 },
2940   { "return",           RID_RETURN,     0 },
2941   { "short",            RID_SHORT,      0 },
2942   { "signed",           RID_SIGNED,     D_TRAD },
2943   { "sizeof",           RID_SIZEOF,     0 },
2944   { "static",           RID_STATIC,     0 },
2945   { "struct",           RID_STRUCT,     0 },
2946   { "switch",           RID_SWITCH,     0 },
2947   { "typedef",          RID_TYPEDEF,    0 },
2948   { "typeof",           RID_TYPEOF,     D_TRAD|D_EXT },
2949   { "union",            RID_UNION,      0 },
2950   { "unsigned",         RID_UNSIGNED,   0 },
2951   { "void",             RID_VOID,       0 },
2952   { "volatile",         RID_VOLATILE,   D_TRAD },
2953   { "while",            RID_WHILE,      0 },
2954 ifobjc
2955   { "@class",           RID_AT_CLASS,           D_OBJC },
2956   { "@compatibility_alias", RID_AT_ALIAS,       D_OBJC },
2957   { "@defs",            RID_AT_DEFS,            D_OBJC },
2958   { "@encode",          RID_AT_ENCODE,          D_OBJC },
2959   { "@end",             RID_AT_END,             D_OBJC },
2960   { "@implementation",  RID_AT_IMPLEMENTATION,  D_OBJC },
2961   { "@interface",       RID_AT_INTERFACE,       D_OBJC },
2962   { "@private",         RID_AT_PRIVATE,         D_OBJC },
2963   { "@protected",       RID_AT_PROTECTED,       D_OBJC },
2964   { "@protocol",        RID_AT_PROTOCOL,        D_OBJC },
2965   { "@public",          RID_AT_PUBLIC,          D_OBJC },
2966   { "@selector",        RID_AT_SELECTOR,        D_OBJC },
2967   { "id",               RID_ID,                 D_OBJC },
2968   { "bycopy",           RID_BYCOPY,             D_OBJC|D_YES },
2969   { "byref",            RID_BYREF,              D_OBJC|D_YES },
2970   { "in",               RID_IN,                 D_OBJC|D_YES },
2971   { "inout",            RID_INOUT,              D_OBJC|D_YES },
2972   { "oneway",           RID_ONEWAY,             D_OBJC|D_YES },
2973   { "out",              RID_OUT,                D_OBJC|D_YES },
2974 end ifobjc
2975 };
2976 #define N_reswords (sizeof reswords / sizeof (struct resword))
2977
2978 /* Table mapping from RID_* constants to yacc token numbers.
2979    Unfortunately we have to have entries for all the keywords in all
2980    three languages.  */
2981 static const short rid_to_yy[RID_MAX] =
2982 {
2983   /* RID_STATIC */      SCSPEC,
2984   /* RID_UNSIGNED */    TYPESPEC,
2985   /* RID_LONG */        TYPESPEC,
2986   /* RID_CONST */       TYPE_QUAL,
2987   /* RID_EXTERN */      SCSPEC,
2988   /* RID_REGISTER */    SCSPEC,
2989   /* RID_TYPEDEF */     SCSPEC,
2990   /* RID_SHORT */       TYPESPEC,
2991   /* RID_INLINE */      SCSPEC,
2992   /* RID_VOLATILE */    TYPE_QUAL,
2993   /* RID_SIGNED */      TYPESPEC,
2994   /* RID_AUTO */        SCSPEC,
2995   /* RID_RESTRICT */    TYPE_QUAL,
2996
2997   /* C extensions */
2998   /* RID_BOUNDED */     TYPE_QUAL,
2999   /* RID_UNBOUNDED */   TYPE_QUAL,
3000   /* RID_COMPLEX */     TYPESPEC,
3001
3002   /* C++ */
3003   /* RID_FRIEND */      0,
3004   /* RID_VIRTUAL */     0,
3005   /* RID_EXPLICIT */    0,
3006   /* RID_EXPORT */      0,
3007   /* RID_MUTABLE */     0,
3008
3009   /* ObjC */
3010   /* RID_IN */          TYPE_QUAL,
3011   /* RID_OUT */         TYPE_QUAL,
3012   /* RID_INOUT */       TYPE_QUAL,
3013   /* RID_BYCOPY */      TYPE_QUAL,
3014   /* RID_BYREF */       TYPE_QUAL,
3015   /* RID_ONEWAY */      TYPE_QUAL,
3016
3017   /* C */
3018   /* RID_INT */         TYPESPEC,
3019   /* RID_CHAR */        TYPESPEC,
3020   /* RID_FLOAT */       TYPESPEC,
3021   /* RID_DOUBLE */      TYPESPEC,
3022   /* RID_VOID */        TYPESPEC,
3023   /* RID_ENUM */        ENUM,
3024   /* RID_STRUCT */      STRUCT,
3025   /* RID_UNION */       UNION,
3026   /* RID_IF */          IF,
3027   /* RID_ELSE */        ELSE,
3028   /* RID_WHILE */       WHILE,
3029   /* RID_DO */          DO,
3030   /* RID_FOR */         FOR,
3031   /* RID_SWITCH */      SWITCH,
3032   /* RID_CASE */        CASE,
3033   /* RID_DEFAULT */     DEFAULT,
3034   /* RID_BREAK */       BREAK,
3035   /* RID_CONTINUE */    CONTINUE,
3036   /* RID_RETURN */      RETURN,
3037   /* RID_GOTO */        GOTO,
3038   /* RID_SIZEOF */      SIZEOF,
3039
3040   /* C extensions */
3041   /* RID_ASM */         ASM_KEYWORD,
3042   /* RID_TYPEOF */      TYPEOF,
3043   /* RID_ALIGNOF */     ALIGNOF,
3044   /* RID_ATTRIBUTE */   ATTRIBUTE,
3045   /* RID_VA_ARG */      VA_ARG,
3046   /* RID_EXTENSION */   EXTENSION,
3047   /* RID_IMAGPART */    IMAGPART,
3048   /* RID_REALPART */    REALPART,
3049   /* RID_LABEL */       LABEL,
3050   /* RID_PTRBASE */     PTR_BASE,
3051   /* RID_PTREXTENT */   PTR_EXTENT,
3052   /* RID_PTRVALUE */    PTR_VALUE,
3053
3054   /* C++ */
3055   /* RID_BOOL */        TYPESPEC,
3056   /* RID_WCHAR */       0,
3057   /* RID_CLASS */       0,
3058   /* RID_PUBLIC */      0,
3059   /* RID_PRIVATE */     0,
3060   /* RID_PROTECTED */   0,
3061   /* RID_TEMPLATE */    0,
3062   /* RID_NULL */        0,
3063   /* RID_CATCH */       0,
3064   /* RID_DELETE */      0,
3065   /* RID_FALSE */       0,
3066   /* RID_NAMESPACE */   0,
3067   /* RID_NEW */         0,
3068   /* RID_OPERATOR */    0,
3069   /* RID_THIS */        0,
3070   /* RID_THROW */       0,
3071   /* RID_TRUE */        0,
3072   /* RID_TRY */         0,
3073   /* RID_TYPENAME */    0,
3074   /* RID_TYPEID */      0,
3075   /* RID_USING */       0,
3076
3077   /* casts */
3078   /* RID_CONSTCAST */   0,
3079   /* RID_DYNCAST */     0,
3080   /* RID_REINTCAST */   0,
3081   /* RID_STATCAST */    0,
3082
3083   /* alternate spellings */
3084   /* RID_AND */         0,
3085   /* RID_AND_EQ */      0,
3086   /* RID_NOT */         0,
3087   /* RID_NOT_EQ */      0,
3088   /* RID_OR */          0,
3089   /* RID_OR_EQ */       0,
3090   /* RID_XOR */         0,
3091   /* RID_XOR_EQ */      0,
3092   /* RID_BITAND */      0,
3093   /* RID_BITOR */       0,
3094   /* RID_COMPL */       0,
3095
3096   /* Objective C */
3097   /* RID_ID */                  OBJECTNAME,
3098   /* RID_AT_ENCODE */           ENCODE,
3099   /* RID_AT_END */              END,
3100   /* RID_AT_CLASS */            CLASS,
3101   /* RID_AT_ALIAS */            ALIAS,
3102   /* RID_AT_DEFS */             DEFS,
3103   /* RID_AT_PRIVATE */          PRIVATE,
3104   /* RID_AT_PROTECTED */        PROTECTED,
3105   /* RID_AT_PUBLIC */           PUBLIC,
3106   /* RID_AT_PROTOCOL */         PROTOCOL,
3107   /* RID_AT_SELECTOR */         SELECTOR,
3108   /* RID_AT_INTERFACE */        INTERFACE,
3109   /* RID_AT_IMPLEMENTATION */   IMPLEMENTATION
3110 };
3111
3112 static void
3113 init_reswords ()
3114 {
3115   unsigned int i;
3116   tree id;
3117   int mask = ((doing_objc_thang ? 0 : D_OBJC)
3118               | (flag_isoc99 ? 0 : D_C89)
3119               | (flag_traditional ? D_TRAD : 0)
3120               | (flag_no_asm ? (flag_isoc99 ? D_EXT : D_EXT|D_EXT89) : 0));
3121
3122   /* It is not necessary to register ridpointers as a GC root, because
3123      all the trees it points to are permanently interned in the
3124      get_identifier hash anyway.  */
3125   ridpointers = (tree *) xcalloc ((int) RID_MAX, sizeof (tree));
3126   for (i = 0; i < N_reswords; i++)
3127     {
3128       /* If a keyword is disabled, do not enter it into the table
3129          and so create a canonical spelling that isn't a keyword.  */
3130       if (reswords[i].disable & mask)
3131         continue;
3132
3133       id = get_identifier (reswords[i].word);
3134       C_RID_CODE (id) = reswords[i].rid;
3135       ridpointers [(int) reswords[i].rid] = id;
3136
3137       /* Objective C does tricky things with enabling and disabling
3138          keywords.  So these we must not elide in the test above, but
3139          wait and not mark them reserved now.  */
3140       if (! (reswords[i].disable & D_YES))
3141         C_IS_RESERVED_WORD (id) = 1;
3142     }
3143 }
3144
3145 const char *
3146 init_parse (filename)
3147      const char *filename;
3148 {
3149   add_c_tree_codes ();
3150
3151   /* Make identifier nodes long enough for the language-specific slots.  */
3152   set_identifier_size (sizeof (struct lang_identifier));
3153
3154   init_reswords ();
3155   init_pragma ();
3156
3157   return init_c_lex (filename);
3158 }
3159
3160 void
3161 finish_parse ()
3162 {
3163   cpp_finish (parse_in);
3164   /* Call to cpp_destroy () omitted for performance reasons.  */
3165   errorcount += cpp_errors (parse_in);
3166 }
3167
3168 #define NAME(type) cpp_type2name (type)
3169
3170 static void
3171 yyerror (msgid)
3172      const char *msgid;
3173 {
3174   const char *string = _(msgid);
3175
3176   if (last_token == CPP_EOF)
3177     error ("%s at end of input", string);
3178   else if (last_token == CPP_CHAR || last_token == CPP_WCHAR)
3179     {
3180       unsigned int val = TREE_INT_CST_LOW (yylval.ttype);
3181       const char *ell = (last_token == CPP_CHAR) ? "" : "L";
3182       if (val <= UCHAR_MAX && ISGRAPH (val))
3183         error ("%s before %s'%c'", string, ell, val);
3184       else
3185         error ("%s before %s'\\x%x'", string, ell, val);
3186     }
3187   else if (last_token == CPP_STRING
3188            || last_token == CPP_WSTRING
3189            || last_token == CPP_OSTRING)
3190     error ("%s before string constant", string);
3191   else if (last_token == CPP_NUMBER
3192            || last_token == CPP_INT
3193            || last_token == CPP_FLOAT)
3194     error ("%s before numeric constant", string);
3195   else if (last_token == CPP_NAME)
3196     error ("%s before \"%s\"", string, IDENTIFIER_POINTER (yylval.ttype));
3197   else
3198     error ("%s before '%s' token", string, NAME(last_token));
3199 }
3200
3201 static inline int
3202 _yylex ()
3203 {
3204  retry:
3205   last_token = c_lex (&yylval.ttype);
3206
3207   switch (last_token)
3208     {
3209     case CPP_EQ:                                        return '=';
3210     case CPP_NOT:                                       return '!';
3211     case CPP_GREATER:   yylval.code = GT_EXPR;          return ARITHCOMPARE;
3212     case CPP_LESS:      yylval.code = LT_EXPR;          return ARITHCOMPARE;
3213     case CPP_PLUS:      yylval.code = PLUS_EXPR;        return '+';
3214     case CPP_MINUS:     yylval.code = MINUS_EXPR;       return '-';
3215     case CPP_MULT:      yylval.code = MULT_EXPR;        return '*';
3216     case CPP_DIV:       yylval.code = TRUNC_DIV_EXPR;   return '/';
3217     case CPP_MOD:       yylval.code = TRUNC_MOD_EXPR;   return '%';
3218     case CPP_AND:       yylval.code = BIT_AND_EXPR;     return '&';
3219     case CPP_OR:        yylval.code = BIT_IOR_EXPR;     return '|';
3220     case CPP_XOR:       yylval.code = BIT_XOR_EXPR;     return '^';
3221     case CPP_RSHIFT:    yylval.code = RSHIFT_EXPR;      return RSHIFT;
3222     case CPP_LSHIFT:    yylval.code = LSHIFT_EXPR;      return LSHIFT;
3223
3224     case CPP_COMPL:                                     return '~';
3225     case CPP_AND_AND:                                   return ANDAND;
3226     case CPP_OR_OR:                                     return OROR;
3227     case CPP_QUERY:                                     return '?';
3228     case CPP_COLON:                                     return ':';
3229     case CPP_COMMA:                                     return ',';
3230     case CPP_OPEN_PAREN:                                return '(';
3231     case CPP_CLOSE_PAREN:                               return ')';
3232     case CPP_EQ_EQ:     yylval.code = EQ_EXPR;          return EQCOMPARE;
3233     case CPP_NOT_EQ:    yylval.code = NE_EXPR;          return EQCOMPARE;
3234     case CPP_GREATER_EQ:yylval.code = GE_EXPR;          return ARITHCOMPARE;
3235     case CPP_LESS_EQ:   yylval.code = LE_EXPR;          return ARITHCOMPARE;
3236
3237     case CPP_PLUS_EQ:   yylval.code = PLUS_EXPR;        return ASSIGN;
3238     case CPP_MINUS_EQ:  yylval.code = MINUS_EXPR;       return ASSIGN;
3239     case CPP_MULT_EQ:   yylval.code = MULT_EXPR;        return ASSIGN;
3240     case CPP_DIV_EQ:    yylval.code = TRUNC_DIV_EXPR;   return ASSIGN;
3241     case CPP_MOD_EQ:    yylval.code = TRUNC_MOD_EXPR;   return ASSIGN;
3242     case CPP_AND_EQ:    yylval.code = BIT_AND_EXPR;     return ASSIGN;
3243     case CPP_OR_EQ:     yylval.code = BIT_IOR_EXPR;     return ASSIGN;
3244     case CPP_XOR_EQ:    yylval.code = BIT_XOR_EXPR;     return ASSIGN;
3245     case CPP_RSHIFT_EQ: yylval.code = RSHIFT_EXPR;      return ASSIGN;
3246     case CPP_LSHIFT_EQ: yylval.code = LSHIFT_EXPR;      return ASSIGN;
3247
3248     case CPP_OPEN_SQUARE:                               return '[';
3249     case CPP_CLOSE_SQUARE:                              return ']';
3250     case CPP_OPEN_BRACE:                                return '{';
3251     case CPP_CLOSE_BRACE:                               return '}';
3252     case CPP_SEMICOLON:                                 return ';';
3253     case CPP_ELLIPSIS:                                  return ELLIPSIS;
3254
3255     case CPP_PLUS_PLUS:                                 return PLUSPLUS;
3256     case CPP_MINUS_MINUS:                               return MINUSMINUS;
3257     case CPP_DEREF:                                     return POINTSAT;
3258     case CPP_DOT:                                       return '.';
3259
3260     case CPP_EOF:
3261       if (cpp_pop_buffer (parse_in) == 0)
3262         return 0;
3263       goto retry;
3264
3265     case CPP_NAME:
3266       if (C_IS_RESERVED_WORD (yylval.ttype))
3267         {
3268           enum rid rid_code = C_RID_CODE (yylval.ttype);
3269           /* Return the canonical spelling for this keyword.  */
3270           yylval.ttype = ridpointers[(int) rid_code];
3271           return rid_to_yy[(int) rid_code];
3272         }
3273
3274       if (IDENTIFIER_POINTER (yylval.ttype)[0] == '@')
3275         {
3276           error ("invalid identifier `%s'", IDENTIFIER_POINTER (yylval.ttype));
3277           return IDENTIFIER;
3278         }
3279
3280       {
3281         tree decl;
3282
3283         decl = lookup_name (yylval.ttype);
3284
3285         if (decl)
3286           {
3287             if (TREE_CODE (decl) == TYPE_DECL)
3288               return TYPENAME;
3289             /* A user-invisible read-only initialized variable
3290                should be replaced by its value.
3291                We handle only strings since that's the only case used in C.  */
3292             else if (TREE_CODE (decl) == VAR_DECL
3293                      && DECL_IGNORED_P (decl)
3294                      && TREE_READONLY (decl)
3295                      && DECL_INITIAL (decl) != 0
3296                      && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
3297               {
3298                 tree stringval = DECL_INITIAL (decl);
3299
3300                 /* Copy the string value so that we won't clobber anything
3301                    if we put something in the TREE_CHAIN of this one.  */
3302                 yylval.ttype = build_string (TREE_STRING_LENGTH (stringval),
3303                                              TREE_STRING_POINTER (stringval));
3304                 return STRING;
3305               }
3306           }
3307         else if (doing_objc_thang)
3308           {
3309             tree objc_interface_decl = is_class_name (yylval.ttype);
3310
3311             if (objc_interface_decl)
3312               {
3313                 yylval.ttype = objc_interface_decl;
3314                 return CLASSNAME;
3315               }
3316           }
3317
3318         return IDENTIFIER;
3319       }
3320
3321     case CPP_INT:
3322     case CPP_FLOAT:
3323     case CPP_NUMBER:
3324     case CPP_CHAR:
3325     case CPP_WCHAR:
3326       return CONSTANT;
3327
3328     case CPP_STRING:
3329     case CPP_WSTRING:
3330       return STRING;
3331
3332     case CPP_OSTRING:
3333       return OBJC_STRING;
3334
3335       /* These tokens are C++ specific (and will not be generated
3336          in C mode, but let's be cautious).  */
3337     case CPP_SCOPE:
3338     case CPP_DEREF_STAR:
3339     case CPP_DOT_STAR:
3340     case CPP_MIN_EQ:
3341     case CPP_MAX_EQ:
3342     case CPP_MIN:
3343     case CPP_MAX:
3344       /* These tokens should not survive translation phase 4.  */
3345     case CPP_HASH:
3346     case CPP_PASTE:
3347       error ("syntax error before '%s' token", NAME(last_token));
3348       goto retry;
3349
3350     default:
3351       abort ();
3352     }
3353
3354   /* NOTREACHED */
3355 }
3356
3357 static int
3358 yylex()
3359 {
3360   int r;
3361   timevar_push (TV_LEX);
3362   r = _yylex();
3363   timevar_pop (TV_LEX);
3364   return r;
3365 }
3366
3367 /* Sets the value of the 'yydebug' variable to VALUE.
3368    This is a function so we don't have to have YYDEBUG defined
3369    in order to build the compiler.  */
3370
3371 void
3372 set_yydebug (value)
3373      int value;
3374 {
3375 #if YYDEBUG != 0
3376   yydebug = value;
3377 #else
3378   warning ("YYDEBUG not defined.");
3379 #endif
3380 }
3381
3382 /* Function used when yydebug is set, to print a token in more detail.  */
3383
3384 static void
3385 yyprint (file, yychar, yyl)
3386      FILE *file;
3387      int yychar;
3388      YYSTYPE yyl;
3389 {
3390   tree t = yyl.ttype;
3391
3392   fprintf (file, " [%s]", NAME(last_token));
3393
3394   switch (yychar)
3395     {
3396     case IDENTIFIER:
3397     case TYPENAME:
3398     case OBJECTNAME:
3399     case TYPESPEC:
3400     case TYPE_QUAL:
3401     case SCSPEC:
3402       if (IDENTIFIER_POINTER (t))
3403         fprintf (file, " `%s'", IDENTIFIER_POINTER (t));
3404       break;
3405
3406     case CONSTANT:
3407       fprintf (file, " %s", GET_MODE_NAME (TYPE_MODE (TREE_TYPE (t))));
3408       if (TREE_CODE (t) == INTEGER_CST)
3409         fprintf (file,
3410 #if HOST_BITS_PER_WIDE_INT == 64
3411 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_INT
3412                  " 0x%x%016x",
3413 #else
3414 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
3415                  " 0x%lx%016lx",
3416 #else
3417                  " 0x%llx%016llx",
3418 #endif
3419 #endif
3420 #else
3421 #if HOST_BITS_PER_WIDE_INT != HOST_BITS_PER_INT
3422                  " 0x%lx%08lx",
3423 #else
3424                  " 0x%x%08x",
3425 #endif
3426 #endif
3427                  TREE_INT_CST_HIGH (t), TREE_INT_CST_LOW (t));
3428       break;
3429     }
3430 }
3431 \f
3432 /* This is not the ideal place to put these, but we have to get them out
3433    of c-lex.c because cp/lex.c has its own versions.  */
3434
3435 /* Return something to represent absolute declarators containing a *.
3436    TARGET is the absolute declarator that the * contains.
3437    TYPE_QUALS is a list of modifiers such as const or volatile
3438    to apply to the pointer type, represented as identifiers.
3439
3440    We return an INDIRECT_REF whose "contents" are TARGET
3441    and whose type is the modifier list.  */
3442
3443 tree
3444 make_pointer_declarator (type_quals, target)
3445      tree type_quals, target;
3446 {
3447   return build1 (INDIRECT_REF, type_quals, target);
3448 }