gcc/c-parse.y

   1 /*WARNING: This file is automatically generated!*/
   2 /* YACC parser for C syntax and for Objective C.  -*-c-*-
   3    Copyright (C) 1987, 88, 89, 92-98, 1999 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 %expect 51
  32
  33 /* These are the 23 conflicts you should get in parse.output;
  34    the state numbers may vary if minor changes in the grammar are made.
  35
  36 State 42 contains 1 shift/reduce conflict.  (Two ways to parse ATTRIBUTE.)
  37 State 44 contains 1 shift/reduce conflict.  (Two ways to recover from error.)
  38 State 103 contains 1 shift/reduce conflict.  (Two ways to recover from error.)
  39 State 110 contains 1 shift/reduce conflict.  (Two ways to parse ATTRIBUTE.)
  40 State 111 contains 1 shift/reduce conflict.  (Two ways to recover from error.)
  41 State 115 contains 1 shift/reduce conflict.  (Two ways to recover from error.)
  42 State 132 contains 1 shift/reduce conflict.  (See comment at component_decl.)
  43 State 180 contains 1 shift/reduce conflict.  (Two ways to parse ATTRIBUTE.)
  44 State 194 contains 2 shift/reduce conflict.  (Four ways to parse this.)
  45 State 202 contains 1 shift/reduce conflict.  (Two ways to recover from error.)
  46 State 214 contains 1 shift/reduce conflict.  (Two ways to recover from error.)
  47 State 220 contains 1 shift/reduce conflict.  (Two ways to recover from error.)
  48 State 304 contains 2 shift/reduce conflicts.  (Four ways to parse this.)
  49 State 335 contains 2 shift/reduce conflicts.  (Four ways to parse this.)
  50 State 347 contains 1 shift/reduce conflict.  (Two ways to parse ATTRIBUTES.)
  51 State 352 contains 1 shift/reduce conflict.  (Two ways to parse ATTRIBUTES.)
  52 State 383 contains 2 shift/reduce conflicts.  (Four ways to parse this.)
  53 State 434 contains 2 shift/reduce conflicts.  (Four ways to parse this.)  */
  54
  55
  56 %{
  57 #include "config.h"
  58 #include "system.h"
  59 #include <setjmp.h>
  60
  61 #include "tree.h"
  62 #include "input.h"
  63 #include "c-lex.h"
  64 #include "c-tree.h"
  65 #include "flags.h"
  66 #include "output.h"
  67 #include "toplev.h"
  68
  69 #ifdef MULTIBYTE_CHARS
  70 #include <locale.h>
  71 #endif
  72
  73
  74 /* Since parsers are distinct for each language, put the language string
  75    definition here.  */
  76 char *language_string = "GNU C";
  77
  78 /* Like YYERROR but do call yyerror.  */
  79 #define YYERROR1 { yyerror ("syntax error"); YYERROR; }
  80
  81 /* Cause the `yydebug' variable to be defined.  */
  82 #define YYDEBUG 1
  83 %}
  84
  85 %start program
  86
  87 %union {long itype; tree ttype; enum tree_code code;
  88         char *filename; int lineno; int ends_in_label; }
  89
  90 /* All identifiers that are not reserved words
  91    and are not declared typedefs in the current block */
  92 %token IDENTIFIER
  93
  94 /* All identifiers that are declared typedefs in the current block.
  95    In some contexts, they are treated just like IDENTIFIER,
  96    but they can also serve as typespecs in declarations.  */
  97 %token TYPENAME
  98
  99 /* Reserved words that specify storage class.
 100    yylval contains an IDENTIFIER_NODE which indicates which one.  */
 101 %token SCSPEC
 102
 103 /* Reserved words that specify type.
 104    yylval contains an IDENTIFIER_NODE which indicates which one.  */
 105 %token TYPESPEC
 106
 107 /* Reserved words that qualify type: "const", "volatile", or "restrict".
 108    yylval contains an IDENTIFIER_NODE which indicates which one.  */
 109 %token TYPE_QUAL
 110
 111 /* Character or numeric constants.
 112    yylval is the node for the constant.  */
 113 %token CONSTANT
 114
 115 /* String constants in raw form.
 116    yylval is a STRING_CST node.  */
 117 %token STRING
 118
 119 /* "...", used for functions with variable arglists.  */
 120 %token ELLIPSIS
 121
 122 /* the reserved words */
 123 /* SCO include files test "ASM", so use something else. */
 124 %token SIZEOF ENUM STRUCT UNION IF ELSE WHILE DO FOR SWITCH CASE DEFAULT
 125 %token BREAK CONTINUE RETURN GOTO ASM_KEYWORD TYPEOF ALIGNOF
 126 %token ATTRIBUTE EXTENSION LABEL
 127 %token REALPART IMAGPART
 128
 129 /* Add precedence rules to solve dangling else s/r conflict */
 130 %nonassoc IF
 131 %nonassoc ELSE
 132
 133 /* Define the operator tokens and their precedences.
 134    The value is an integer because, if used, it is the tree code
 135    to use in the expression made from the operator.  */
 136
 137 %right <code> ASSIGN '='
 138 %right <code> '?' ':'
 139 %left <code> OROR
 140 %left <code> ANDAND
 141 %left <code> '|'
 142 %left <code> '^'
 143 %left <code> '&'
 144 %left <code> EQCOMPARE
 145 %left <code> ARITHCOMPARE
 146 %left <code> LSHIFT RSHIFT
 147 %left <code> '+' '-'
 148 %left <code> '*' '/' '%'
 149 %right <code> UNARY PLUSPLUS MINUSMINUS
 150 %left HYPERUNARY
 151 %left <code> POINTSAT '.' '(' '['
 152
 153 /* The Objective-C keywords.  These are included in C and in
 154    Objective C, so that the token codes are the same in both.  */
 155 %token INTERFACE IMPLEMENTATION END SELECTOR DEFS ENCODE
 156 %token CLASSNAME PUBLIC PRIVATE PROTECTED PROTOCOL OBJECTNAME CLASS ALIAS
 157
 158 /* Objective-C string constants in raw form.
 159    yylval is an OBJC_STRING_CST node.  */
 160 %token OBJC_STRING
 161
 162
 163 %type <code> unop
 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
 178
 179 %type <ttype> compstmt
 180
 181 %type <ttype> declarator
 182 %type <ttype> notype_declarator after_type_declarator
 183 %type <ttype> parm_declarator
 184
 185 %type <ttype> structsp component_decl_list component_decl_list2
 186 %type <ttype> component_decl components component_declarator
 187 %type <ttype> enumlist enumerator
 188 %type <ttype> struct_head union_head enum_head
 189 %type <ttype> typename absdcl absdcl1 type_quals
 190 %type <ttype> xexpr parms parm identifiers
 191
 192 %type <ttype> parmlist parmlist_1 parmlist_2
 193 %type <ttype> parmlist_or_identifiers parmlist_or_identifiers_1
 194 %type <ttype> identifiers_or_typenames
 195
 196 %type <itype> setspecs
 197
 198 %type <ends_in_label> lineno_stmt_or_label lineno_stmt_or_labels stmt_or_label
 199
 200 %type <filename> save_filename
 201 %type <lineno> save_lineno
 202 \f
 203 \f
 204 %{
 205 /* Number of statements (loosely speaking) and compound statements
 206    seen so far.  */
 207 static int stmt_count;
 208 static int compstmt_count;
 209
 210 /* Input file and line number of the end of the body of last simple_if;
 211    used by the stmt-rule immediately after simple_if returns.  */
 212 static char *if_stmt_file;
 213 static int if_stmt_line;
 214
 215 /* List of types and structure classes of the current declaration.  */
 216 static tree current_declspecs = NULL_TREE;
 217 static tree prefix_attributes = NULL_TREE;
 218
 219 /* Stack of saved values of current_declspecs and prefix_attributes.  */
 220 static tree declspec_stack;
 221
 222 /* 1 if we explained undeclared var errors.  */
 223 static int undeclared_variable_notice;
 224
 225
 226 /* Tell yyparse how to print a token's value, if yydebug is set.  */
 227
 228 #define YYPRINT(FILE,YYCHAR,YYLVAL) yyprint(FILE,YYCHAR,YYLVAL)
 229 extern void yyprint                     PROTO ((FILE *, int, YYSTYPE));
 230 %}
 231 \f
 232 %%
 233 program: /* empty */
 234                 { if (pedantic)
 235                     pedwarn ("ANSI C forbids an empty source file");
 236                   finish_file ();
 237                 }
 238         | extdefs
 239                 {
 240                   /* In case there were missing closebraces,
 241                      get us back to the global binding level.  */
 242                   while (! global_bindings_p ())
 243                     poplevel (0, 0, 0);
 244                   finish_file ();
 245                 }
 246         ;
 247
 248 /* the reason for the strange actions in this rule
 249  is so that notype_initdecls when reached via datadef
 250  can find a valid list of type and sc specs in $0. */
 251
 252 extdefs:
 253         {$<ttype>$ = NULL_TREE; } extdef
 254         | extdefs {$<ttype>$ = NULL_TREE; } extdef
 255         ;
 256
 257 extdef:
 258         fndef
 259         | datadef
 260         | ASM_KEYWORD '(' expr ')' ';'
 261                 { STRIP_NOPS ($3);
 262                   if ((TREE_CODE ($3) == ADDR_EXPR
 263                        && TREE_CODE (TREE_OPERAND ($3, 0)) == STRING_CST)
 264                       || TREE_CODE ($3) == STRING_CST)
 265                     assemble_asm ($3);
 266                   else
 267                     error ("argument of `asm' is not a constant string"); }
 268         | extension extdef
 269                 { pedantic = $<itype>1; }
 270         ;
 271
 272 datadef:
 273           setspecs notype_initdecls ';'
 274                 { if (pedantic)
 275                     error ("ANSI C forbids data definition with no type or storage class");
 276                   else if (!flag_traditional)
 277                     warning ("data definition has no type or storage class");
 278
 279                   current_declspecs = TREE_VALUE (declspec_stack);
 280                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 281                   declspec_stack = TREE_CHAIN (declspec_stack);
 282                   resume_momentary ($1); }
 283         | declmods setspecs notype_initdecls ';'
 284                 { current_declspecs = TREE_VALUE (declspec_stack);
 285                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 286                   declspec_stack = TREE_CHAIN (declspec_stack);
 287                   resume_momentary ($2); }
 288         | typed_declspecs setspecs initdecls ';'
 289                 { current_declspecs = TREE_VALUE (declspec_stack);
 290                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 291                   declspec_stack = TREE_CHAIN (declspec_stack);
 292                   resume_momentary ($2);  }
 293         | declmods ';'
 294           { pedwarn ("empty declaration"); }
 295         | typed_declspecs ';'
 296           { shadow_tag ($1); }
 297         | error ';'
 298         | error '}'
 299         | ';'
 300                 { if (pedantic)
 301                     pedwarn ("ANSI C does not allow extra `;' outside of a function"); }
 302         ;
 303 \f
 304 fndef:
 305           typed_declspecs setspecs declarator
 306                 { if (! start_function (current_declspecs, $3,
 307                                         prefix_attributes, NULL_TREE, 0))
 308                     YYERROR1;
 309                   reinit_parse_for_function (); }
 310           old_style_parm_decls
 311                 { store_parm_decls (); }
 312           compstmt_or_error
 313                 { finish_function (0);
 314                   current_declspecs = TREE_VALUE (declspec_stack);
 315                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 316                   declspec_stack = TREE_CHAIN (declspec_stack);
 317                   resume_momentary ($2); }
 318         | typed_declspecs setspecs declarator error
 319                 { current_declspecs = TREE_VALUE (declspec_stack);
 320                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 321                   declspec_stack = TREE_CHAIN (declspec_stack);
 322                   resume_momentary ($2); }
 323         | declmods setspecs notype_declarator
 324                 { if (! start_function (current_declspecs, $3,
 325                                         prefix_attributes, NULL_TREE, 0))
 326                     YYERROR1;
 327                   reinit_parse_for_function (); }
 328           old_style_parm_decls
 329                 { store_parm_decls (); }
 330           compstmt_or_error
 331                 { finish_function (0);
 332                   current_declspecs = TREE_VALUE (declspec_stack);
 333                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 334                   declspec_stack = TREE_CHAIN (declspec_stack);
 335                   resume_momentary ($2); }
 336         | declmods setspecs notype_declarator error
 337                 { current_declspecs = TREE_VALUE (declspec_stack);
 338                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 339                   declspec_stack = TREE_CHAIN (declspec_stack);
 340                   resume_momentary ($2); }
 341         | setspecs notype_declarator
 342                 { if (! start_function (NULL_TREE, $2,
 343                                         prefix_attributes, NULL_TREE, 0))
 344                     YYERROR1;
 345                   reinit_parse_for_function (); }
 346           old_style_parm_decls
 347                 { store_parm_decls (); }
 348           compstmt_or_error
 349                 { finish_function (0);
 350                   current_declspecs = TREE_VALUE (declspec_stack);
 351                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 352                   declspec_stack = TREE_CHAIN (declspec_stack);
 353                   resume_momentary ($1); }
 354         | setspecs notype_declarator error
 355                 { current_declspecs = TREE_VALUE (declspec_stack);
 356                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 357                   declspec_stack = TREE_CHAIN (declspec_stack);
 358                   resume_momentary ($1); }
 359         ;
 360
 361 identifier:
 362         IDENTIFIER
 363         | TYPENAME
 364         ;
 365
 366 unop:     '&'
 367                 { $$ = ADDR_EXPR; }
 368         | '-'
 369                 { $$ = NEGATE_EXPR; }
 370         | '+'
 371                 { $$ = CONVERT_EXPR; }
 372         | PLUSPLUS
 373                 { $$ = PREINCREMENT_EXPR; }
 374         | MINUSMINUS
 375                 { $$ = PREDECREMENT_EXPR; }
 376         | '~'
 377                 { $$ = BIT_NOT_EXPR; }
 378         | '!'
 379                 { $$ = TRUTH_NOT_EXPR; }
 380         ;
 381
 382 expr:   nonnull_exprlist
 383                 { $$ = build_compound_expr ($1); }
 384         ;
 385
 386 exprlist:
 387           /* empty */
 388                 { $$ = NULL_TREE; }
 389         | nonnull_exprlist
 390         ;
 391
 392 nonnull_exprlist:
 393         expr_no_commas
 394                 { $$ = build_tree_list (NULL_TREE, $1); }
 395         | nonnull_exprlist ',' expr_no_commas
 396                 { chainon ($1, build_tree_list (NULL_TREE, $3)); }
 397         ;
 398
 399 unary_expr:
 400         primary
 401         | '*' cast_expr   %prec UNARY
 402                 { $$ = build_indirect_ref ($2, "unary *"); }
 403         /* __extension__ turns off -pedantic for following primary.  */
 404         | extension cast_expr     %prec UNARY
 405                 { $$ = $2;
 406                   pedantic = $<itype>1; }
 407         | unop cast_expr  %prec UNARY
 408                 { $$ = build_unary_op ($1, $2, 0);
 409                   overflow_warning ($$); }
 410         /* Refer to the address of a label as a pointer.  */
 411         | ANDAND identifier
 412                 { tree label = lookup_label ($2);
 413                   if (pedantic)
 414                     pedwarn ("ANSI C forbids `&&'");
 415                   if (label == 0)
 416                     $$ = null_pointer_node;
 417                   else
 418                     {
 419                       TREE_USED (label) = 1;
 420                       $$ = build1 (ADDR_EXPR, ptr_type_node, label);
 421                       TREE_CONSTANT ($$) = 1;
 422                     }
 423                 }
 424 /* This seems to be impossible on some machines, so let's turn it off.
 425    You can use __builtin_next_arg to find the anonymous stack args.
 426         | '&' ELLIPSIS
 427                 { tree types = TYPE_ARG_TYPES (TREE_TYPE (current_function_decl));
 428                   $$ = error_mark_node;
 429                   if (TREE_VALUE (tree_last (types)) == void_type_node)
 430                     error ("`&...' used in function with fixed number of arguments");
 431                   else
 432                     {
 433                       if (pedantic)
 434                         pedwarn ("ANSI C forbids `&...'");
 435                       $$ = tree_last (DECL_ARGUMENTS (current_function_decl));
 436                       $$ = build_unary_op (ADDR_EXPR, $$, 0);
 437                     } }
 438 */
 439         | sizeof unary_expr  %prec UNARY
 440                 { skip_evaluation--;
 441                   if (TREE_CODE ($2) == COMPONENT_REF
 442                       && DECL_C_BIT_FIELD (TREE_OPERAND ($2, 1)))
 443                     error ("`sizeof' applied to a bit-field");
 444                   $$ = c_sizeof (TREE_TYPE ($2)); }
 445         | sizeof '(' typename ')'  %prec HYPERUNARY
 446                 { skip_evaluation--;
 447                   $$ = c_sizeof (groktypename ($3)); }
 448         | alignof unary_expr  %prec UNARY
 449                 { skip_evaluation--;
 450                   $$ = c_alignof_expr ($2); }
 451         | alignof '(' typename ')'  %prec HYPERUNARY
 452                 { skip_evaluation--;
 453                   $$ = c_alignof (groktypename ($3)); }
 454         | REALPART cast_expr %prec UNARY
 455                 { $$ = build_unary_op (REALPART_EXPR, $2, 0); }
 456         | IMAGPART cast_expr %prec UNARY
 457                 { $$ = build_unary_op (IMAGPART_EXPR, $2, 0); }
 458         ;
 459
 460 sizeof:
 461         SIZEOF { skip_evaluation++; }
 462         ;
 463
 464 alignof:
 465         ALIGNOF { skip_evaluation++; }
 466         ;
 467
 468 cast_expr:
 469         unary_expr
 470         | '(' typename ')' cast_expr  %prec UNARY
 471                 { tree type = groktypename ($2);
 472                   $$ = build_c_cast (type, $4); }
 473         | '(' typename ')' '{'
 474                 { start_init (NULL_TREE, NULL, 0);
 475                   $2 = groktypename ($2);
 476                   really_start_incremental_init ($2); }
 477           initlist_maybe_comma '}'  %prec UNARY
 478                 { char *name;
 479                   tree result = pop_init_level (0);
 480                   tree type = $2;
 481                   finish_init ();
 482
 483                   if (pedantic && ! flag_isoc9x)
 484                     pedwarn ("ANSI C forbids constructor expressions");
 485                   if (TYPE_NAME (type) != 0)
 486                     {
 487                       if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
 488                         name = IDENTIFIER_POINTER (TYPE_NAME (type));
 489                       else
 490                         name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
 491                     }
 492                   else
 493                     name = "";
 494                   $$ = result;
 495                   if (TREE_CODE (type) == ARRAY_TYPE && TYPE_SIZE (type) == 0)
 496                     {
 497                       int failure = complete_array_type (type, $$, 1);
 498                       if (failure)
 499                         abort ();
 500                     }
 501                 }
 502         ;
 503
 504 expr_no_commas:
 505           cast_expr
 506         | expr_no_commas '+' expr_no_commas
 507                 { $$ = parser_build_binary_op ($2, $1, $3); }
 508         | expr_no_commas '-' expr_no_commas
 509                 { $$ = parser_build_binary_op ($2, $1, $3); }
 510         | expr_no_commas '*' expr_no_commas
 511                 { $$ = parser_build_binary_op ($2, $1, $3); }
 512         | expr_no_commas '/' expr_no_commas
 513                 { $$ = parser_build_binary_op ($2, $1, $3); }
 514         | expr_no_commas '%' expr_no_commas
 515                 { $$ = parser_build_binary_op ($2, $1, $3); }
 516         | expr_no_commas LSHIFT expr_no_commas
 517                 { $$ = parser_build_binary_op ($2, $1, $3); }
 518         | expr_no_commas RSHIFT expr_no_commas
 519                 { $$ = parser_build_binary_op ($2, $1, $3); }
 520         | expr_no_commas ARITHCOMPARE expr_no_commas
 521                 { $$ = parser_build_binary_op ($2, $1, $3); }
 522         | expr_no_commas EQCOMPARE expr_no_commas
 523                 { $$ = parser_build_binary_op ($2, $1, $3); }
 524         | expr_no_commas '&' expr_no_commas
 525                 { $$ = parser_build_binary_op ($2, $1, $3); }
 526         | expr_no_commas '|' expr_no_commas
 527                 { $$ = parser_build_binary_op ($2, $1, $3); }
 528         | expr_no_commas '^' expr_no_commas
 529                 { $$ = parser_build_binary_op ($2, $1, $3); }
 530         | expr_no_commas ANDAND
 531                 { $1 = truthvalue_conversion (default_conversion ($1));
 532                   skip_evaluation += $1 == boolean_false_node; }
 533           expr_no_commas
 534                 { skip_evaluation -= $1 == boolean_false_node;
 535                   $$ = parser_build_binary_op (TRUTH_ANDIF_EXPR, $1, $4); }
 536         | expr_no_commas OROR
 537                 { $1 = truthvalue_conversion (default_conversion ($1));
 538                   skip_evaluation += $1 == boolean_true_node; }
 539           expr_no_commas
 540                 { skip_evaluation -= $1 == boolean_true_node;
 541                   $$ = parser_build_binary_op (TRUTH_ORIF_EXPR, $1, $4); }
 542         | expr_no_commas '?'
 543                 { $1 = truthvalue_conversion (default_conversion ($1));
 544                   skip_evaluation += $1 == boolean_false_node; }
 545           expr ':'
 546                 { skip_evaluation += (($1 == boolean_true_node)
 547                                       - ($1 == boolean_false_node)); }
 548           expr_no_commas
 549                 { skip_evaluation -= $1 == boolean_true_node;
 550                   $$ = build_conditional_expr ($1, $4, $7); }
 551         | expr_no_commas '?'
 552                 { if (pedantic)
 553                     pedwarn ("ANSI C forbids omitting the middle term of a ?: expression");
 554                   /* Make sure first operand is calculated only once.  */
 555                   $<ttype>2 = save_expr ($1);
 556                   $1 = truthvalue_conversion (default_conversion ($<ttype>2));
 557                   skip_evaluation += $1 == boolean_true_node; }
 558           ':' expr_no_commas
 559                 { skip_evaluation -= $1 == boolean_true_node;
 560                   $$ = build_conditional_expr ($1, $<ttype>2, $5); }
 561         | expr_no_commas '=' expr_no_commas
 562                 { char class;
 563                   $$ = build_modify_expr ($1, NOP_EXPR, $3);
 564                   class = TREE_CODE_CLASS (TREE_CODE ($$));
 565                   if (class == 'e' || class == '1'
 566                       || class == '2' || class == '<')
 567                     C_SET_EXP_ORIGINAL_CODE ($$, MODIFY_EXPR);
 568                 }
 569         | expr_no_commas ASSIGN expr_no_commas
 570                 { char class;
 571                   $$ = build_modify_expr ($1, $2, $3);
 572                   /* This inhibits warnings in truthvalue_conversion.  */
 573                   class = TREE_CODE_CLASS (TREE_CODE ($$));
 574                   if (class == 'e' || class == '1'
 575                       || class == '2' || class == '<')
 576                     C_SET_EXP_ORIGINAL_CODE ($$, ERROR_MARK);
 577                 }
 578         ;
 579
 580 primary:
 581         IDENTIFIER
 582                 {
 583                   $$ = lastiddecl;
 584                   if (!$$ || $$ == error_mark_node)
 585                     {
 586                       if (yychar == YYEMPTY)
 587                         yychar = YYLEX;
 588                       if (yychar == '(')
 589                         {
 590                             {
 591                               /* Ordinary implicit function declaration.  */
 592                               $$ = implicitly_declare ($1);
 593                               assemble_external ($$);
 594                               TREE_USED ($$) = 1;
 595                             }
 596                         }
 597                       else if (current_function_decl == 0)
 598                         {
 599                           error ("`%s' undeclared here (not in a function)",
 600                                  IDENTIFIER_POINTER ($1));
 601                           $$ = error_mark_node;
 602                         }
 603                       else
 604                         {
 605                             {
 606                               if (IDENTIFIER_GLOBAL_VALUE ($1) != error_mark_node
 607                                   || IDENTIFIER_ERROR_LOCUS ($1) != current_function_decl)
 608                                 {
 609                                   error ("`%s' undeclared (first use in this function)",
 610                                          IDENTIFIER_POINTER ($1));
 611
 612                                   if (! undeclared_variable_notice)
 613                                     {
 614                                       error ("(Each undeclared identifier is reported only once");
 615                                       error ("for each function it appears in.)");
 616                                       undeclared_variable_notice = 1;
 617                                     }
 618                                 }
 619                               $$ = error_mark_node;
 620                               /* Prevent repeated error messages.  */
 621                               IDENTIFIER_GLOBAL_VALUE ($1) = error_mark_node;
 622                               IDENTIFIER_ERROR_LOCUS ($1) = current_function_decl;
 623                             }
 624                         }
 625                     }
 626                   else if (TREE_TYPE ($$) == error_mark_node)
 627                     $$ = error_mark_node;
 628                   else if (C_DECL_ANTICIPATED ($$))
 629                     {
 630                       /* The first time we see a build-in function used,
 631                          if it has not been declared.  */
 632                       C_DECL_ANTICIPATED ($$) = 0;
 633                       if (yychar == YYEMPTY)
 634                         yychar = YYLEX;
 635                       if (yychar == '(')
 636                         {
 637                           /* Omit the implicit declaration we
 638                              would ordinarily do, so we don't lose
 639                              the actual built in type.
 640                              But print a diagnostic for the mismatch.  */
 641                             if (TREE_CODE ($$) != FUNCTION_DECL)
 642                               error ("`%s' implicitly declared as function",
 643                                      IDENTIFIER_POINTER (DECL_NAME ($$)));
 644                           else if ((TYPE_MODE (TREE_TYPE (TREE_TYPE ($$)))
 645                                     != TYPE_MODE (integer_type_node))
 646                                    && (TREE_TYPE (TREE_TYPE ($$))
 647                                        != void_type_node))
 648                             pedwarn ("type mismatch in implicit declaration for built-in function `%s'",
 649                                      IDENTIFIER_POINTER (DECL_NAME ($$)));
 650                           /* If it really returns void, change that to int.  */
 651                           if (TREE_TYPE (TREE_TYPE ($$)) == void_type_node)
 652                             TREE_TYPE ($$)
 653                               = build_function_type (integer_type_node,
 654                                                      TYPE_ARG_TYPES (TREE_TYPE ($$)));
 655                         }
 656                       else
 657                         pedwarn ("built-in function `%s' used without declaration",
 658                                  IDENTIFIER_POINTER (DECL_NAME ($$)));
 659
 660                       /* Do what we would ordinarily do when a fn is used.  */
 661                       assemble_external ($$);
 662                       TREE_USED ($$) = 1;
 663                     }
 664                   else
 665                     {
 666                       assemble_external ($$);
 667                       TREE_USED ($$) = 1;
 668                     }
 669
 670                   if (TREE_CODE ($$) == CONST_DECL)
 671                     {
 672                       $$ = DECL_INITIAL ($$);
 673                       /* This is to prevent an enum whose value is 0
 674                          from being considered a null pointer constant.  */
 675                       $$ = build1 (NOP_EXPR, TREE_TYPE ($$), $$);
 676                       TREE_CONSTANT ($$) = 1;
 677                     }
 678                 }
 679         | CONSTANT
 680         | string
 681                 { $$ = combine_strings ($1); }
 682         | '(' expr ')'
 683                 { char class = TREE_CODE_CLASS (TREE_CODE ($2));
 684                   if (class == 'e' || class == '1'
 685                       || class == '2' || class == '<')
 686                     C_SET_EXP_ORIGINAL_CODE ($2, ERROR_MARK);
 687                   $$ = $2; }
 688         | '(' error ')'
 689                 { $$ = error_mark_node; }
 690         | '('
 691                 { if (current_function_decl == 0)
 692                     {
 693                       error ("braced-group within expression allowed only inside a function");
 694                       YYERROR;
 695                     }
 696                   /* We must force a BLOCK for this level
 697                      so that, if it is not expanded later,
 698                      there is a way to turn off the entire subtree of blocks
 699                      that are contained in it.  */
 700                   keep_next_level ();
 701                   push_iterator_stack ();
 702                   push_label_level ();
 703                   $<ttype>$ = expand_start_stmt_expr (); }
 704           compstmt ')'
 705                 { tree rtl_exp;
 706                   if (pedantic)
 707                     pedwarn ("ANSI C forbids braced-groups within expressions");
 708                   pop_iterator_stack ();
 709                   pop_label_level ();
 710                   rtl_exp = expand_end_stmt_expr ($<ttype>2);
 711                   /* The statements have side effects, so the group does.  */
 712                   TREE_SIDE_EFFECTS (rtl_exp) = 1;
 713
 714                   if (TREE_CODE ($3) == BLOCK)
 715                     {
 716                       /* Make a BIND_EXPR for the BLOCK already made.  */
 717                       $$ = build (BIND_EXPR, TREE_TYPE (rtl_exp),
 718                                   NULL_TREE, rtl_exp, $3);
 719                       /* Remove the block from the tree at this point.
 720                          It gets put back at the proper place
 721                          when the BIND_EXPR is expanded.  */
 722                       delete_block ($3);
 723                     }
 724                   else
 725                     $$ = $3;
 726                 }
 727         | primary '(' exprlist ')'   %prec '.'
 728                 { $$ = build_function_call ($1, $3); }
 729         | primary '[' expr ']'   %prec '.'
 730                 { $$ = build_array_ref ($1, $3); }
 731         | primary '.' identifier
 732                 {
 733                     $$ = build_component_ref ($1, $3);
 734                 }
 735         | primary POINTSAT identifier
 736                 {
 737                   tree expr = build_indirect_ref ($1, "->");
 738
 739                     $$ = build_component_ref (expr, $3);
 740                 }
 741         | primary PLUSPLUS
 742                 { $$ = build_unary_op (POSTINCREMENT_EXPR, $1, 0); }
 743         | primary MINUSMINUS
 744                 { $$ = build_unary_op (POSTDECREMENT_EXPR, $1, 0); }
 745         ;
 746
 747 /* Produces a STRING_CST with perhaps more STRING_CSTs chained onto it.  */
 748 string:
 749           STRING
 750         | string STRING
 751                 { $$ = chainon ($1, $2); }
 752         ;
 753
 754
 755 old_style_parm_decls:
 756         /* empty */
 757         | datadecls
 758         | datadecls ELLIPSIS
 759                 /* ... is used here to indicate a varargs function.  */
 760                 { c_mark_varargs ();
 761                   if (pedantic)
 762                     pedwarn ("ANSI C does not permit use of `varargs.h'"); }
 763         ;
 764
 765 /* The following are analogous to lineno_decl, decls and decl
 766    except that they do not allow nested functions.
 767    They are used for old-style parm decls.  */
 768 lineno_datadecl:
 769           save_filename save_lineno datadecl
 770                 { }
 771         ;
 772
 773 datadecls:
 774         lineno_datadecl
 775         | errstmt
 776         | datadecls lineno_datadecl
 777         | lineno_datadecl errstmt
 778         ;
 779
 780 /* We don't allow prefix attributes here because they cause reduce/reduce
 781    conflicts: we can't know whether we're parsing a function decl with
 782    attribute suffix, or function defn with attribute prefix on first old
 783    style parm.  */
 784 datadecl:
 785         typed_declspecs_no_prefix_attr setspecs initdecls ';'
 786                 { current_declspecs = TREE_VALUE (declspec_stack);
 787                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 788                   declspec_stack = TREE_CHAIN (declspec_stack);
 789                   resume_momentary ($2); }
 790         | declmods_no_prefix_attr setspecs notype_initdecls ';'
 791                 { current_declspecs = TREE_VALUE (declspec_stack);
 792                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 793                   declspec_stack = TREE_CHAIN (declspec_stack);
 794                   resume_momentary ($2); }
 795         | typed_declspecs_no_prefix_attr ';'
 796                 { shadow_tag_warned ($1, 1);
 797                   pedwarn ("empty declaration"); }
 798         | declmods_no_prefix_attr ';'
 799                 { pedwarn ("empty declaration"); }
 800         ;
 801
 802 /* This combination which saves a lineno before a decl
 803    is the normal thing to use, rather than decl itself.
 804    This is to avoid shift/reduce conflicts in contexts
 805    where statement labels are allowed.  */
 806 lineno_decl:
 807           save_filename save_lineno decl
 808                 { }
 809         ;
 810
 811 decls:
 812         lineno_decl
 813         | errstmt
 814         | decls lineno_decl
 815         | lineno_decl errstmt
 816         ;
 817
 818 /* records the type and storage class specs to use for processing
 819    the declarators that follow.
 820    Maintains a stack of outer-level values of current_declspecs,
 821    for the sake of parm declarations nested in function declarators.  */
 822 setspecs: /* empty */
 823                 { $$ = suspend_momentary ();
 824                   pending_xref_error ();
 825                   declspec_stack = tree_cons (prefix_attributes,
 826                                               current_declspecs,
 827                                               declspec_stack);
 828                   split_specs_attrs ($<ttype>0,
 829                                      &current_declspecs, &prefix_attributes); }
 830         ;
 831
 832 /* ??? Yuck.  See after_type_declarator.  */
 833 setattrs: /* empty */
 834                 { prefix_attributes = chainon (prefix_attributes, $<ttype>0); }
 835         ;
 836
 837 decl:
 838         typed_declspecs setspecs initdecls ';'
 839                 { current_declspecs = TREE_VALUE (declspec_stack);
 840                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 841                   declspec_stack = TREE_CHAIN (declspec_stack);
 842                   resume_momentary ($2); }
 843         | declmods setspecs notype_initdecls ';'
 844                 { current_declspecs = TREE_VALUE (declspec_stack);
 845                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 846                   declspec_stack = TREE_CHAIN (declspec_stack);
 847                   resume_momentary ($2); }
 848         | typed_declspecs setspecs nested_function
 849                 { current_declspecs = TREE_VALUE (declspec_stack);
 850                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 851                   declspec_stack = TREE_CHAIN (declspec_stack);
 852                   resume_momentary ($2); }
 853         | declmods setspecs notype_nested_function
 854                 { current_declspecs = TREE_VALUE (declspec_stack);
 855                   prefix_attributes = TREE_PURPOSE (declspec_stack);
 856                   declspec_stack = TREE_CHAIN (declspec_stack);
 857                   resume_momentary ($2); }
 858         | typed_declspecs ';'
 859                 { shadow_tag ($1); }
 860         | declmods ';'
 861                 { pedwarn ("empty declaration"); }
 862         | extension decl
 863                 { pedantic = $<itype>1; }
 864         ;
 865
 866 /* Declspecs which contain at least one type specifier or typedef name.
 867    (Just `const' or `volatile' is not enough.)
 868    A typedef'd name following these is taken as a name to be declared.
 869    Declspecs have a non-NULL TREE_VALUE, attributes do not.  */
 870
 871 typed_declspecs:
 872           typespec reserved_declspecs
 873                 { $$ = tree_cons (NULL_TREE, $1, $2); }
 874         | declmods typespec reserved_declspecs
 875                 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
 876         ;
 877
 878 reserved_declspecs:  /* empty */
 879                 { $$ = NULL_TREE; }
 880         | reserved_declspecs typespecqual_reserved
 881                 { $$ = tree_cons (NULL_TREE, $2, $1); }
 882         | reserved_declspecs SCSPEC
 883                 { if (extra_warnings)
 884                     warning ("`%s' is not at beginning of declaration",
 885                              IDENTIFIER_POINTER ($2));
 886                   $$ = tree_cons (NULL_TREE, $2, $1); }
 887         | reserved_declspecs attributes
 888                 { $$ = tree_cons ($2, NULL_TREE, $1); }
 889         ;
 890
 891 typed_declspecs_no_prefix_attr:
 892           typespec reserved_declspecs_no_prefix_attr
 893                 { $$ = tree_cons (NULL_TREE, $1, $2); }
 894         | declmods_no_prefix_attr typespec reserved_declspecs_no_prefix_attr
 895                 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
 896         ;
 897
 898 reserved_declspecs_no_prefix_attr:
 899           /* empty */
 900                 { $$ = NULL_TREE; }
 901         | reserved_declspecs_no_prefix_attr typespecqual_reserved
 902                 { $$ = tree_cons (NULL_TREE, $2, $1); }
 903         | reserved_declspecs_no_prefix_attr SCSPEC
 904                 { if (extra_warnings)
 905                     warning ("`%s' is not at beginning of declaration",
 906                              IDENTIFIER_POINTER ($2));
 907                   $$ = tree_cons (NULL_TREE, $2, $1); }
 908         ;
 909
 910 /* List of just storage classes, type modifiers, and prefix attributes.
 911    A declaration can start with just this, but then it cannot be used
 912    to redeclare a typedef-name.
 913    Declspecs have a non-NULL TREE_VALUE, attributes do not.  */
 914
 915 declmods:
 916           declmods_no_prefix_attr
 917                 { $$ = $1; }
 918         | attributes
 919                 { $$ = tree_cons ($1, NULL_TREE, NULL_TREE); }
 920         | declmods declmods_no_prefix_attr
 921                 { $$ = chainon ($2, $1); }
 922         | declmods attributes
 923                 { $$ = tree_cons ($2, NULL_TREE, $1); }
 924         ;
 925
 926 declmods_no_prefix_attr:
 927           TYPE_QUAL
 928                 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE);
 929                   TREE_STATIC ($$) = 1; }
 930         | SCSPEC
 931                 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
 932         | declmods_no_prefix_attr TYPE_QUAL
 933                 { $$ = tree_cons (NULL_TREE, $2, $1);
 934                   TREE_STATIC ($$) = 1; }
 935         | declmods_no_prefix_attr SCSPEC
 936                 { if (extra_warnings && TREE_STATIC ($1))
 937                     warning ("`%s' is not at beginning of declaration",
 938                              IDENTIFIER_POINTER ($2));
 939                   $$ = tree_cons (NULL_TREE, $2, $1);
 940                   TREE_STATIC ($$) = TREE_STATIC ($1); }
 941         ;
 942
 943
 944 /* Used instead of declspecs where storage classes are not allowed
 945    (that is, for typenames and structure components).
 946    Don't accept a typedef-name if anything but a modifier precedes it.  */
 947
 948 typed_typespecs:
 949           typespec reserved_typespecquals
 950                 { $$ = tree_cons (NULL_TREE, $1, $2); }
 951         | nonempty_type_quals typespec reserved_typespecquals
 952                 { $$ = chainon ($3, tree_cons (NULL_TREE, $2, $1)); }
 953         ;
 954
 955 reserved_typespecquals:  /* empty */
 956                 { $$ = NULL_TREE; }
 957         | reserved_typespecquals typespecqual_reserved
 958                 { $$ = tree_cons (NULL_TREE, $2, $1); }
 959         ;
 960
 961 /* A typespec (but not a type qualifier).
 962    Once we have seen one of these in a declaration,
 963    if a typedef name appears then it is being redeclared.  */
 964
 965 typespec: TYPESPEC
 966         | structsp
 967         | TYPENAME
 968                 { /* For a typedef name, record the meaning, not the name.
 969                      In case of `foo foo, bar;'.  */
 970                   $$ = lookup_name ($1); }
 971         | TYPEOF '(' expr ')'
 972                 { $$ = TREE_TYPE ($3); }
 973         | TYPEOF '(' typename ')'
 974                 { $$ = groktypename ($3); }
 975         ;
 976
 977 /* A typespec that is a reserved word, or a type qualifier.  */
 978
 979 typespecqual_reserved: TYPESPEC
 980         | TYPE_QUAL
 981         | structsp
 982         ;
 983
 984 initdecls:
 985         initdcl
 986         | initdecls ',' initdcl
 987         ;
 988
 989 notype_initdecls:
 990         notype_initdcl
 991         | notype_initdecls ',' initdcl
 992         ;
 993
 994 maybeasm:
 995           /* empty */
 996                 { $$ = NULL_TREE; }
 997         | ASM_KEYWORD '(' string ')'
 998                 { if (TREE_CHAIN ($3)) $3 = combine_strings ($3);
 999                   $$ = $3;
1000                 }
1001         ;
1002
1003 initdcl:
1004           declarator maybeasm maybe_attribute '='
1005                 { $<ttype>$ = start_decl ($1, current_declspecs, 1,
1006                                           $3, prefix_attributes);
1007                   start_init ($<ttype>$, $2, global_bindings_p ()); }
1008           init
1009 /* Note how the declaration of the variable is in effect while its init is parsed! */
1010                 { finish_init ();
1011                   finish_decl ($<ttype>5, $6, $2); }
1012         | declarator maybeasm maybe_attribute
1013                 { tree d = start_decl ($1, current_declspecs, 0,
1014                                        $3, prefix_attributes);
1015                   finish_decl (d, NULL_TREE, $2);
1016                 }
1017         ;
1018
1019 notype_initdcl:
1020           notype_declarator maybeasm maybe_attribute '='
1021                 { $<ttype>$ = start_decl ($1, current_declspecs, 1,
1022                                           $3, prefix_attributes);
1023                   start_init ($<ttype>$, $2, global_bindings_p ()); }
1024           init
1025 /* Note how the declaration of the variable is in effect while its init is parsed! */
1026                 { finish_init ();
1027                   decl_attributes ($<ttype>5, $3, prefix_attributes);
1028                   finish_decl ($<ttype>5, $6, $2); }
1029         | notype_declarator maybeasm maybe_attribute
1030                 { tree d = start_decl ($1, current_declspecs, 0,
1031                                        $3, prefix_attributes);
1032                   finish_decl (d, NULL_TREE, $2); }
1033         ;
1034 /* the * rules are dummies to accept the Apollo extended syntax
1035    so that the header files compile. */
1036 maybe_attribute:
1037       /* empty */
1038                 { $$ = NULL_TREE; }
1039         | attributes
1040                 { $$ = $1; }
1041         ;
1042
1043 attributes:
1044       attribute
1045                 { $$ = $1; }
1046         | attributes attribute
1047                 { $$ = chainon ($1, $2); }
1048         ;
1049
1050 attribute:
1051       ATTRIBUTE '(' '(' attribute_list ')' ')'
1052                 { $$ = $4; }
1053         ;
1054
1055 attribute_list:
1056       attrib
1057                 { $$ = $1; }
1058         | attribute_list ',' attrib
1059                 { $$ = chainon ($1, $3); }
1060         ;
1061
1062 attrib:
1063     /* empty */
1064                 { $$ = NULL_TREE; }
1065         | any_word
1066                 { $$ = build_tree_list ($1, NULL_TREE); }
1067         | any_word '(' IDENTIFIER ')'
1068                 { $$ = build_tree_list ($1, build_tree_list (NULL_TREE, $3)); }
1069         | any_word '(' IDENTIFIER ',' nonnull_exprlist ')'
1070                 { $$ = build_tree_list ($1, tree_cons (NULL_TREE, $3, $5)); }
1071         | any_word '(' exprlist ')'
1072                 { $$ = build_tree_list ($1, $3); }
1073         ;
1074
1075 /* This still leaves out most reserved keywords,
1076    shouldn't we include them?  */
1077
1078 any_word:
1079           identifier
1080         | SCSPEC
1081         | TYPESPEC
1082         | TYPE_QUAL
1083         ;
1084 \f
1085 /* Initializers.  `init' is the entry point.  */
1086
1087 init:
1088         expr_no_commas
1089         | '{'
1090                 { really_start_incremental_init (NULL_TREE);
1091                   /* Note that the call to clear_momentary
1092                      is in process_init_element.  */
1093                   push_momentary (); }
1094           initlist_maybe_comma '}'
1095                 { $$ = pop_init_level (0);
1096                   if ($$ == error_mark_node
1097                       && ! (yychar == STRING || yychar == CONSTANT))
1098                     pop_momentary ();
1099                   else
1100                     pop_momentary_nofree (); }
1101
1102         | error
1103                 { $$ = error_mark_node; }
1104         ;
1105
1106 /* `initlist_maybe_comma' is the guts of an initializer in braces.  */
1107 initlist_maybe_comma:
1108           /* empty */
1109                 { if (pedantic)
1110                     pedwarn ("ANSI C forbids empty initializer braces"); }
1111         | initlist1 maybecomma
1112         ;
1113
1114 initlist1:
1115           initelt
1116         | initlist1 ',' initelt
1117         ;
1118
1119 /* `initelt' is a single element of an initializer.
1120    It may use braces.  */
1121 initelt:
1122           designator_list '=' initval
1123         | designator initval
1124         | identifier ':'
1125                 { set_init_label ($1); }
1126           initval
1127         | initval
1128         ;
1129
1130 initval:
1131           '{'
1132                 { push_init_level (0); }
1133           initlist_maybe_comma '}'
1134                 { process_init_element (pop_init_level (0)); }
1135         | expr_no_commas
1136                 { process_init_element ($1); }
1137         | error
1138         ;
1139
1140 designator_list:
1141           designator
1142         | designator_list designator
1143         ;
1144
1145 designator:
1146           '.' identifier
1147                 { set_init_label ($2); }
1148         /* These are for labeled elements.  The syntax for an array element
1149            initializer conflicts with the syntax for an Objective-C message,
1150            so don't include these productions in the Objective-C grammar.  */
1151         | '[' expr_no_commas ELLIPSIS expr_no_commas ']'
1152                 { set_init_index ($2, $4); }
1153         | '[' expr_no_commas ']'
1154                 { set_init_index ($2, NULL_TREE); }
1155         ;
1156 \f
1157 nested_function:
1158           declarator
1159                 { push_c_function_context ();
1160                   if (! start_function (current_declspecs, $1,
1161                                         prefix_attributes, NULL_TREE, 1))
1162                     {
1163                       pop_c_function_context ();
1164                       YYERROR1;
1165                     }
1166                   reinit_parse_for_function (); }
1167            old_style_parm_decls
1168                 { store_parm_decls (); }
1169 /* This used to use compstmt_or_error.
1170    That caused a bug with input `f(g) int g {}',
1171    where the use of YYERROR1 above caused an error
1172    which then was handled by compstmt_or_error.
1173    There followed a repeated execution of that same rule,
1174    which called YYERROR1 again, and so on.  */
1175           compstmt
1176                 { finish_function (1);
1177                   pop_c_function_context (); }
1178         ;
1179
1180 notype_nested_function:
1181           notype_declarator
1182                 { push_c_function_context ();
1183                   if (! start_function (current_declspecs, $1,
1184                                         prefix_attributes, NULL_TREE, 1))
1185                     {
1186                       pop_c_function_context ();
1187                       YYERROR1;
1188                     }
1189                   reinit_parse_for_function (); }
1190           old_style_parm_decls
1191                 { store_parm_decls (); }
1192 /* This used to use compstmt_or_error.
1193    That caused a bug with input `f(g) int g {}',
1194    where the use of YYERROR1 above caused an error
1195    which then was handled by compstmt_or_error.
1196    There followed a repeated execution of that same rule,
1197    which called YYERROR1 again, and so on.  */
1198           compstmt
1199                 { finish_function (1);
1200                   pop_c_function_context (); }
1201         ;
1202
1203 /* Any kind of declarator (thus, all declarators allowed
1204    after an explicit typespec).  */
1205
1206 declarator:
1207           after_type_declarator
1208         | notype_declarator
1209         ;
1210
1211 /* A declarator that is allowed only after an explicit typespec.  */
1212
1213 after_type_declarator:
1214           '(' after_type_declarator ')'
1215                 { $$ = $2; }
1216         | after_type_declarator '(' parmlist_or_identifiers  %prec '.'
1217                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1218 /*      | after_type_declarator '(' error ')'  %prec '.'
1219                 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1220                   poplevel (0, 0, 0); }  */
1221         | after_type_declarator '[' expr ']'  %prec '.'
1222                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1223         | after_type_declarator '[' ']'  %prec '.'
1224                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1225         | '*' type_quals after_type_declarator  %prec UNARY
1226                 { $$ = make_pointer_declarator ($2, $3); }
1227         /* ??? Yuck.  setattrs is a quick hack.  We can't use
1228            prefix_attributes because $1 only applies to this
1229            declarator.  We assume setspecs has already been done.
1230            setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1231            attributes could be recognized here or in `attributes').  */
1232         | attributes setattrs after_type_declarator
1233                 { $$ = $3; }
1234         | TYPENAME
1235         ;
1236
1237 /* Kinds of declarator that can appear in a parameter list
1238    in addition to notype_declarator.  This is like after_type_declarator
1239    but does not allow a typedef name in parentheses as an identifier
1240    (because it would conflict with a function with that typedef as arg).  */
1241
1242 parm_declarator:
1243           parm_declarator '(' parmlist_or_identifiers  %prec '.'
1244                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1245 /*      | parm_declarator '(' error ')'  %prec '.'
1246                 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1247                   poplevel (0, 0, 0); }  */
1248         | parm_declarator '[' '*' ']'  %prec '.'
1249                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
1250                   if (! flag_isoc9x)
1251                     error ("`[*]' in parameter declaration only allowed in ISO C 9x");
1252                 }
1253         | parm_declarator '[' expr ']'  %prec '.'
1254                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1255         | parm_declarator '[' ']'  %prec '.'
1256                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1257         | '*' type_quals parm_declarator  %prec UNARY
1258                 { $$ = make_pointer_declarator ($2, $3); }
1259         /* ??? Yuck.  setattrs is a quick hack.  We can't use
1260            prefix_attributes because $1 only applies to this
1261            declarator.  We assume setspecs has already been done.
1262            setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1263            attributes could be recognized here or in `attributes').  */
1264         | attributes setattrs parm_declarator
1265                 { $$ = $3; }
1266         | TYPENAME
1267         ;
1268
1269 /* A declarator allowed whether or not there has been
1270    an explicit typespec.  These cannot redeclare a typedef-name.  */
1271
1272 notype_declarator:
1273           notype_declarator '(' parmlist_or_identifiers  %prec '.'
1274                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1275 /*      | notype_declarator '(' error ')'  %prec '.'
1276                 { $$ = build_nt (CALL_EXPR, $1, NULL_TREE, NULL_TREE);
1277                   poplevel (0, 0, 0); }  */
1278         | '(' notype_declarator ')'
1279                 { $$ = $2; }
1280         | '*' type_quals notype_declarator  %prec UNARY
1281                 { $$ = make_pointer_declarator ($2, $3); }
1282         | notype_declarator '[' '*' ']'  %prec '.'
1283                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE);
1284                   if (! flag_isoc9x)
1285                     error ("`[*]' in parameter declaration only allowed in ISO C 9x");
1286                 }
1287         | notype_declarator '[' expr ']'  %prec '.'
1288                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1289         | notype_declarator '[' ']'  %prec '.'
1290                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1291         /* ??? Yuck.  setattrs is a quick hack.  We can't use
1292            prefix_attributes because $1 only applies to this
1293            declarator.  We assume setspecs has already been done.
1294            setattrs also avoids 5 reduce/reduce conflicts (otherwise multiple
1295            attributes could be recognized here or in `attributes').  */
1296         | attributes setattrs notype_declarator
1297                 { $$ = $3; }
1298         | IDENTIFIER
1299         ;
1300
1301 struct_head:
1302           STRUCT
1303                 { $$ = NULL_TREE; }
1304         | STRUCT attributes
1305                 { $$ = $2; }
1306         ;
1307
1308 union_head:
1309           UNION
1310                 { $$ = NULL_TREE; }
1311         | UNION attributes
1312                 { $$ = $2; }
1313         ;
1314
1315 enum_head:
1316           ENUM
1317                 { $$ = NULL_TREE; }
1318         | ENUM attributes
1319                 { $$ = $2; }
1320         ;
1321
1322 structsp:
1323           struct_head identifier '{'
1324                 { $$ = start_struct (RECORD_TYPE, $2);
1325                   /* Start scope of tag before parsing components.  */
1326                 }
1327           component_decl_list '}' maybe_attribute
1328                 { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
1329         | struct_head '{' component_decl_list '}' maybe_attribute
1330                 { $$ = finish_struct (start_struct (RECORD_TYPE, NULL_TREE),
1331                                       $3, chainon ($1, $5));
1332                 }
1333         | struct_head identifier
1334                 { $$ = xref_tag (RECORD_TYPE, $2); }
1335         | union_head identifier '{'
1336                 { $$ = start_struct (UNION_TYPE, $2); }
1337           component_decl_list '}' maybe_attribute
1338                 { $$ = finish_struct ($<ttype>4, $5, chainon ($1, $7)); }
1339         | union_head '{' component_decl_list '}' maybe_attribute
1340                 { $$ = finish_struct (start_struct (UNION_TYPE, NULL_TREE),
1341                                       $3, chainon ($1, $5));
1342                 }
1343         | union_head identifier
1344                 { $$ = xref_tag (UNION_TYPE, $2); }
1345         | enum_head identifier '{'
1346                 { $<itype>3 = suspend_momentary ();
1347                   $$ = start_enum ($2); }
1348           enumlist maybecomma_warn '}' maybe_attribute
1349                 { $$= finish_enum ($<ttype>4, nreverse ($5), chainon ($1, $8));
1350                   resume_momentary ($<itype>3); }
1351         | enum_head '{'
1352                 { $<itype>2 = suspend_momentary ();
1353                   $$ = start_enum (NULL_TREE); }
1354           enumlist maybecomma_warn '}' maybe_attribute
1355                 { $$= finish_enum ($<ttype>3, nreverse ($4), chainon ($1, $7));
1356                   resume_momentary ($<itype>2); }
1357         | enum_head identifier
1358                 { $$ = xref_tag (ENUMERAL_TYPE, $2); }
1359         ;
1360
1361 maybecomma:
1362           /* empty */
1363         | ','
1364         ;
1365
1366 maybecomma_warn:
1367           /* empty */
1368         | ','
1369                 { if (pedantic && ! flag_isoc9x)
1370                     pedwarn ("comma at end of enumerator list"); }
1371         ;
1372
1373 component_decl_list:
1374           component_decl_list2
1375                 { $$ = $1; }
1376         | component_decl_list2 component_decl
1377                 { $$ = chainon ($1, $2);
1378                   pedwarn ("no semicolon at end of struct or union"); }
1379         ;
1380
1381 component_decl_list2:   /* empty */
1382                 { $$ = NULL_TREE; }
1383         | component_decl_list2 component_decl ';'
1384                 { $$ = chainon ($1, $2); }
1385         | component_decl_list2 ';'
1386                 { if (pedantic)
1387                     pedwarn ("extra semicolon in struct or union specified"); }
1388         ;
1389
1390 /* There is a shift-reduce conflict here, because `components' may
1391    start with a `typename'.  It happens that shifting (the default resolution)
1392    does the right thing, because it treats the `typename' as part of
1393    a `typed_typespecs'.
1394
1395    It is possible that this same technique would allow the distinction
1396    between `notype_initdecls' and `initdecls' to be eliminated.
1397    But I am being cautious and not trying it.  */
1398
1399 component_decl:
1400           typed_typespecs setspecs components
1401                 { $$ = $3;
1402                   current_declspecs = TREE_VALUE (declspec_stack);
1403                   prefix_attributes = TREE_PURPOSE (declspec_stack);
1404                   declspec_stack = TREE_CHAIN (declspec_stack);
1405                   resume_momentary ($2); }
1406         | typed_typespecs
1407                 { if (pedantic)
1408                     pedwarn ("ANSI C forbids member declarations with no members");
1409                   shadow_tag($1);
1410                   $$ = NULL_TREE; }
1411         | nonempty_type_quals setspecs components
1412                 { $$ = $3;
1413                   current_declspecs = TREE_VALUE (declspec_stack);
1414                   prefix_attributes = TREE_PURPOSE (declspec_stack);
1415                   declspec_stack = TREE_CHAIN (declspec_stack);
1416                   resume_momentary ($2); }
1417         | nonempty_type_quals
1418                 { if (pedantic)
1419                     pedwarn ("ANSI C forbids member declarations with no members");
1420                   shadow_tag($1);
1421                   $$ = NULL_TREE; }
1422         | error
1423                 { $$ = NULL_TREE; }
1424         | extension component_decl
1425                 { $$ = $2;
1426                   pedantic = $<itype>1; }
1427         ;
1428
1429 components:
1430           component_declarator
1431         | components ',' component_declarator
1432                 { $$ = chainon ($1, $3); }
1433         ;
1434
1435 component_declarator:
1436           save_filename save_lineno declarator maybe_attribute
1437                 { $$ = grokfield ($1, $2, $3, current_declspecs, NULL_TREE);
1438                   decl_attributes ($$, $4, prefix_attributes); }
1439         | save_filename save_lineno
1440           declarator ':' expr_no_commas maybe_attribute
1441                 { $$ = grokfield ($1, $2, $3, current_declspecs, $5);
1442                   decl_attributes ($$, $6, prefix_attributes); }
1443         | save_filename save_lineno ':' expr_no_commas maybe_attribute
1444                 { $$ = grokfield ($1, $2, NULL_TREE, current_declspecs, $4);
1445                   decl_attributes ($$, $5, prefix_attributes); }
1446         ;
1447
1448 /* We chain the enumerators in reverse order.
1449    They are put in forward order where enumlist is used.
1450    (The order used to be significant, but no longer is so.
1451    However, we still maintain the order, just to be clean.)  */
1452
1453 enumlist:
1454           enumerator
1455         | enumlist ',' enumerator
1456                 { if ($1 == error_mark_node)
1457                     $$ = $1;
1458                   else
1459                     $$ = chainon ($3, $1); }
1460         | error
1461                 { $$ = error_mark_node; }
1462         ;
1463
1464
1465 enumerator:
1466           identifier
1467                 { $$ = build_enumerator ($1, NULL_TREE); }
1468         | identifier '=' expr_no_commas
1469                 { $$ = build_enumerator ($1, $3); }
1470         ;
1471
1472 typename:
1473         typed_typespecs absdcl
1474                 { $$ = build_tree_list ($1, $2); }
1475         | nonempty_type_quals absdcl
1476                 { $$ = build_tree_list ($1, $2); }
1477         ;
1478
1479 absdcl:   /* an absolute declarator */
1480         /* empty */
1481                 { $$ = NULL_TREE; }
1482         | absdcl1
1483         ;
1484
1485 nonempty_type_quals:
1486           TYPE_QUAL
1487                 { $$ = tree_cons (NULL_TREE, $1, NULL_TREE); }
1488         | nonempty_type_quals TYPE_QUAL
1489                 { $$ = tree_cons (NULL_TREE, $2, $1); }
1490         ;
1491
1492 type_quals:
1493           /* empty */
1494                 { $$ = NULL_TREE; }
1495         | type_quals TYPE_QUAL
1496                 { $$ = tree_cons (NULL_TREE, $2, $1); }
1497         ;
1498
1499 absdcl1:  /* a nonempty absolute declarator */
1500           '(' absdcl1 ')'
1501                 { $$ = $2; }
1502           /* `(typedef)1' is `int'.  */
1503         | '*' type_quals absdcl1  %prec UNARY
1504                 { $$ = make_pointer_declarator ($2, $3); }
1505         | '*' type_quals  %prec UNARY
1506                 { $$ = make_pointer_declarator ($2, NULL_TREE); }
1507         | absdcl1 '(' parmlist  %prec '.'
1508                 { $$ = build_nt (CALL_EXPR, $1, $3, NULL_TREE); }
1509         | absdcl1 '[' expr ']'  %prec '.'
1510                 { $$ = build_nt (ARRAY_REF, $1, $3); }
1511         | absdcl1 '[' ']'  %prec '.'
1512                 { $$ = build_nt (ARRAY_REF, $1, NULL_TREE); }
1513         | '(' parmlist  %prec '.'
1514                 { $$ = build_nt (CALL_EXPR, NULL_TREE, $2, NULL_TREE); }
1515         | '[' expr ']'  %prec '.'
1516                 { $$ = build_nt (ARRAY_REF, NULL_TREE, $2); }
1517         | '[' ']'  %prec '.'
1518                 { $$ = build_nt (ARRAY_REF, NULL_TREE, NULL_TREE); }
1519         /* ??? It appears we have to support attributes here, however
1520            using prefix_attributes is wrong.  */
1521         | attributes setattrs absdcl1
1522                 { $$ = $3; }
1523         ;
1524
1525 /* at least one statement, the first of which parses without error.  */
1526 /* stmts is used only after decls, so an invalid first statement
1527    is actually regarded as an invalid decl and part of the decls.  */
1528
1529 stmts:
1530         lineno_stmt_or_labels
1531                 {
1532                   if (pedantic && $1)
1533                     pedwarn ("ANSI C forbids label at end of compound statement");
1534                 }
1535         ;
1536
1537 lineno_stmt_or_labels:
1538           lineno_stmt_or_label
1539         | lineno_stmt_or_labels lineno_stmt_or_label
1540                 { $$ = $2; }
1541         | lineno_stmt_or_labels errstmt
1542                 { $$ = 0; }
1543         ;
1544
1545 xstmts:
1546         /* empty */
1547         | stmts
1548         ;
1549
1550 errstmt:  error ';'
1551         ;
1552
1553 pushlevel:  /* empty */
1554                 { emit_line_note (input_filename, lineno);
1555                   pushlevel (0);
1556                   clear_last_expr ();
1557                   push_momentary ();
1558                   expand_start_bindings (0);
1559                 }
1560         ;
1561
1562 /* Read zero or more forward-declarations for labels
1563    that nested functions can jump to.  */
1564 maybe_label_decls:
1565           /* empty */
1566         | label_decls
1567                 { if (pedantic)
1568                     pedwarn ("ANSI C forbids label declarations"); }
1569         ;
1570
1571 label_decls:
1572           label_decl
1573         | label_decls label_decl
1574         ;
1575
1576 label_decl:
1577           LABEL identifiers_or_typenames ';'
1578                 { tree link;
1579                   for (link = $2; link; link = TREE_CHAIN (link))
1580                     {
1581                       tree label = shadow_label (TREE_VALUE (link));
1582                       C_DECLARED_LABEL_FLAG (label) = 1;
1583                       declare_nonlocal_label (label);
1584                     }
1585                 }
1586         ;
1587
1588 /* This is the body of a function definition.
1589    It causes syntax errors to ignore to the next openbrace.  */
1590 compstmt_or_error:
1591           compstmt
1592                 {}
1593         | error compstmt
1594         ;
1595
1596 compstmt_start: '{' { compstmt_count++; }
1597
1598 compstmt: compstmt_start '}'
1599                 { $$ = convert (void_type_node, integer_zero_node); }
1600         | compstmt_start pushlevel maybe_label_decls decls xstmts '}'
1601                 { emit_line_note (input_filename, lineno);
1602                   expand_end_bindings (getdecls (), 1, 0);
1603                   $$ = poplevel (1, 1, 0);
1604                   if (yychar == CONSTANT || yychar == STRING)
1605                     pop_momentary_nofree ();
1606                   else
1607                     pop_momentary (); }
1608         | compstmt_start pushlevel maybe_label_decls error '}'
1609                 { emit_line_note (input_filename, lineno);
1610                   expand_end_bindings (getdecls (), kept_level_p (), 0);
1611                   $$ = poplevel (kept_level_p (), 0, 0);
1612                   if (yychar == CONSTANT || yychar == STRING)
1613                     pop_momentary_nofree ();
1614                   else
1615                     pop_momentary (); }
1616         | compstmt_start pushlevel maybe_label_decls stmts '}'
1617                 { emit_line_note (input_filename, lineno);
1618                   expand_end_bindings (getdecls (), kept_level_p (), 0);
1619                   $$ = poplevel (kept_level_p (), 0, 0);
1620                   if (yychar == CONSTANT || yychar == STRING)
1621                     pop_momentary_nofree ();
1622                   else
1623                     pop_momentary (); }
1624         ;
1625
1626 /* Value is number of statements counted as of the closeparen.  */
1627 simple_if:
1628           if_prefix lineno_labeled_stmt
1629 /* Make sure c_expand_end_cond is run once
1630    for each call to c_expand_start_cond.
1631    Otherwise a crash is likely.  */
1632         | if_prefix error
1633         ;
1634
1635 if_prefix:
1636           IF '(' expr ')'
1637                 { emit_line_note ($<filename>-1, $<lineno>0);
1638                   c_expand_start_cond (truthvalue_conversion ($3), 0,
1639                                        compstmt_count);
1640                   $<itype>$ = stmt_count;
1641                   if_stmt_file = $<filename>-1;
1642                   if_stmt_line = $<lineno>0;
1643                   position_after_white_space (); }
1644         ;
1645
1646 /* This is a subroutine of stmt.
1647    It is used twice, once for valid DO statements
1648    and once for catching errors in parsing the end test.  */
1649 do_stmt_start:
1650           DO
1651                 { stmt_count++;
1652                   compstmt_count++;
1653                   emit_line_note ($<filename>-1, $<lineno>0);
1654                   /* See comment in `while' alternative, above.  */
1655                   emit_nop ();
1656                   expand_start_loop_continue_elsewhere (1);
1657                   position_after_white_space (); }
1658           lineno_labeled_stmt WHILE
1659                 { expand_loop_continue_here (); }
1660         ;
1661
1662 save_filename:
1663                 { $$ = input_filename; }
1664         ;
1665
1666 save_lineno:
1667                 { $$ = lineno; }
1668         ;
1669
1670 lineno_labeled_stmt:
1671           save_filename save_lineno stmt
1672                 { }
1673 /*      | save_filename save_lineno error
1674                 { }
1675 */
1676         | save_filename save_lineno label lineno_labeled_stmt
1677                 { }
1678         ;
1679
1680 lineno_stmt_or_label:
1681           save_filename save_lineno stmt_or_label
1682                 { $$ = $3; }
1683         ;
1684
1685 stmt_or_label:
1686           stmt
1687                 { $$ = 0; }
1688         | label
1689                 { $$ = 1; }
1690         ;
1691
1692 /* Parse a single real statement, not including any labels.  */
1693 stmt:
1694           compstmt
1695                 { stmt_count++; }
1696         | all_iter_stmt
1697         | expr ';'
1698                 { stmt_count++;
1699                   emit_line_note ($<filename>-1, $<lineno>0);
1700 /* It appears that this should not be done--that a non-lvalue array
1701    shouldn't get an error if the value isn't used.
1702    Section 3.2.2.1 says that an array lvalue gets converted to a pointer
1703    if it appears as a top-level expression,
1704    but says nothing about non-lvalue arrays.  */
1705 #if 0
1706                   /* Call default_conversion to get an error
1707                      on referring to a register array if pedantic.  */
1708                   if (TREE_CODE (TREE_TYPE ($1)) == ARRAY_TYPE
1709                       || TREE_CODE (TREE_TYPE ($1)) == FUNCTION_TYPE)
1710                     $1 = default_conversion ($1);
1711 #endif
1712                   iterator_expand ($1);
1713                   clear_momentary (); }
1714         | simple_if ELSE
1715                 { c_expand_start_else ();
1716                   $<itype>1 = stmt_count;
1717                   position_after_white_space (); }
1718           lineno_labeled_stmt
1719                 { c_expand_end_cond ();
1720                   if (extra_warnings && stmt_count == $<itype>1)
1721                     warning ("empty body in an else-statement"); }
1722         | simple_if %prec IF
1723                 { c_expand_end_cond ();
1724                   /* This warning is here instead of in simple_if, because we
1725                      do not want a warning if an empty if is followed by an
1726                      else statement.  Increment stmt_count so we don't
1727                      give a second error if this is a nested `if'.  */
1728                   if (extra_warnings && stmt_count++ == $<itype>1)
1729                     warning_with_file_and_line (if_stmt_file, if_stmt_line,
1730                                                 "empty body in an if-statement"); }
1731 /* Make sure c_expand_end_cond is run once
1732    for each call to c_expand_start_cond.
1733    Otherwise a crash is likely.  */
1734         | simple_if ELSE error
1735                 { c_expand_end_cond (); }
1736         | WHILE
1737                 { stmt_count++;
1738                   emit_line_note ($<filename>-1, $<lineno>0);
1739                   /* The emit_nop used to come before emit_line_note,
1740                      but that made the nop seem like part of the preceding line.
1741                      And that was confusing when the preceding line was
1742                      inside of an if statement and was not really executed.
1743                      I think it ought to work to put the nop after the line number.
1744                      We will see.  --rms, July 15, 1991.  */
1745                   emit_nop (); }
1746           '(' expr ')'
1747                 { /* Don't start the loop till we have succeeded
1748                      in parsing the end test.  This is to make sure
1749                      that we end every loop we start.  */
1750                   expand_start_loop (1);
1751                   emit_line_note (input_filename, lineno);
1752                   expand_exit_loop_if_false (NULL_PTR,
1753                                              truthvalue_conversion ($4));
1754                   position_after_white_space (); }
1755           lineno_labeled_stmt
1756                 { expand_end_loop (); }
1757         | do_stmt_start
1758           '(' expr ')' ';'
1759                 { emit_line_note (input_filename, lineno);
1760                   expand_exit_loop_if_false (NULL_PTR,
1761                                              truthvalue_conversion ($3));
1762                   expand_end_loop ();
1763                   clear_momentary (); }
1764 /* This rule is needed to make sure we end every loop we start.  */
1765         | do_stmt_start error
1766                 { expand_end_loop ();
1767                   clear_momentary (); }
1768         | FOR
1769           '(' xexpr ';'
1770                 { stmt_count++;
1771                   emit_line_note ($<filename>-1, $<lineno>0);
1772                   /* See comment in `while' alternative, above.  */
1773                   emit_nop ();
1774                   if ($3) c_expand_expr_stmt ($3);
1775                   /* Next step is to call expand_start_loop_continue_elsewhere,
1776                      but wait till after we parse the entire for (...).
1777                      Otherwise, invalid input might cause us to call that
1778                      fn without calling expand_end_loop.  */
1779                 }
1780           xexpr ';'
1781                 /* Can't emit now; wait till after expand_start_loop...  */
1782                 { $<lineno>7 = lineno;
1783                   $<filename>$ = input_filename; }
1784           xexpr ')'
1785                 {
1786                   /* Start the loop.  Doing this after parsing
1787                      all the expressions ensures we will end the loop.  */
1788                   expand_start_loop_continue_elsewhere (1);
1789                   /* Emit the end-test, with a line number.  */
1790                   emit_line_note ($<filename>8, $<lineno>7);
1791                   if ($6)
1792                     expand_exit_loop_if_false (NULL_PTR,
1793                                                truthvalue_conversion ($6));
1794                   /* Don't let the tree nodes for $9 be discarded by
1795                      clear_momentary during the parsing of the next stmt.  */
1796                   push_momentary ();
1797                   $<lineno>7 = lineno;
1798                   $<filename>8 = input_filename;
1799                   position_after_white_space (); }
1800           lineno_labeled_stmt
1801                 { /* Emit the increment expression, with a line number.  */
1802                   emit_line_note ($<filename>8, $<lineno>7);
1803                   expand_loop_continue_here ();
1804                   if ($9)
1805                     c_expand_expr_stmt ($9);
1806                   if (yychar == CONSTANT || yychar == STRING)
1807                     pop_momentary_nofree ();
1808                   else
1809                     pop_momentary ();
1810                   expand_end_loop (); }
1811         | SWITCH '(' expr ')'
1812                 { stmt_count++;
1813                   emit_line_note ($<filename>-1, $<lineno>0);
1814                   c_expand_start_case ($3);
1815                   /* Don't let the tree nodes for $3 be discarded by
1816                      clear_momentary during the parsing of the next stmt.  */
1817                   push_momentary ();
1818                   position_after_white_space (); }
1819           lineno_labeled_stmt
1820                 { expand_end_case ($3);
1821                   if (yychar == CONSTANT || yychar == STRING)
1822                     pop_momentary_nofree ();
1823                   else
1824                     pop_momentary (); }
1825         | BREAK ';'
1826                 { stmt_count++;
1827                   emit_line_note ($<filename>-1, $<lineno>0);
1828                   if ( ! expand_exit_something ())
1829                     error ("break statement not within loop or switch"); }
1830         | CONTINUE ';'
1831                 { stmt_count++;
1832                   emit_line_note ($<filename>-1, $<lineno>0);
1833                   if (! expand_continue_loop (NULL_PTR))
1834                     error ("continue statement not within a loop"); }
1835         | RETURN ';'
1836                 { stmt_count++;
1837                   emit_line_note ($<filename>-1, $<lineno>0);
1838                   c_expand_return (NULL_TREE); }
1839         | RETURN expr ';'
1840                 { stmt_count++;
1841                   emit_line_note ($<filename>-1, $<lineno>0);
1842                   c_expand_return ($2); }
1843         | ASM_KEYWORD maybe_type_qual '(' expr ')' ';'
1844                 { stmt_count++;
1845                   emit_line_note ($<filename>-1, $<lineno>0);
1846                   STRIP_NOPS ($4);
1847                   if ((TREE_CODE ($4) == ADDR_EXPR
1848                        && TREE_CODE (TREE_OPERAND ($4, 0)) == STRING_CST)
1849                       || TREE_CODE ($4) == STRING_CST)
1850                     expand_asm ($4);
1851                   else
1852                     error ("argument of `asm' is not a constant string"); }
1853         /* This is the case with just output operands.  */
1854         | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ')' ';'
1855                 { stmt_count++;
1856                   emit_line_note ($<filename>-1, $<lineno>0);
1857                   c_expand_asm_operands ($4, $6, NULL_TREE, NULL_TREE,
1858                                          $2 == ridpointers[(int)RID_VOLATILE],
1859                                          input_filename, lineno); }
1860         /* This is the case with input operands as well.  */
1861         | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':' asm_operands ')' ';'
1862                 { stmt_count++;
1863                   emit_line_note ($<filename>-1, $<lineno>0);
1864                   c_expand_asm_operands ($4, $6, $8, NULL_TREE,
1865                                          $2 == ridpointers[(int)RID_VOLATILE],
1866                                          input_filename, lineno); }
1867         /* This is the case with clobbered registers as well.  */
1868         | ASM_KEYWORD maybe_type_qual '(' expr ':' asm_operands ':'
1869           asm_operands ':' asm_clobbers ')' ';'
1870                 { stmt_count++;
1871                   emit_line_note ($<filename>-1, $<lineno>0);
1872                   c_expand_asm_operands ($4, $6, $8, $10,
1873                                          $2 == ridpointers[(int)RID_VOLATILE],
1874                                          input_filename, lineno); }
1875         | GOTO identifier ';'
1876                 { tree decl;
1877                   stmt_count++;
1878                   emit_line_note ($<filename>-1, $<lineno>0);
1879                   decl = lookup_label ($2);
1880                   if (decl != 0)
1881                     {
1882                       TREE_USED (decl) = 1;
1883                       expand_goto (decl);
1884                     }
1885                 }
1886         | GOTO '*' expr ';'
1887                 { if (pedantic)
1888                     pedwarn ("ANSI C forbids `goto *expr;'");
1889                   stmt_count++;
1890                   emit_line_note ($<filename>-1, $<lineno>0);
1891                   expand_computed_goto (convert (ptr_type_node, $3)); }
1892         | ';'
1893         ;
1894
1895 all_iter_stmt:
1896           all_iter_stmt_simple
1897 /*      | all_iter_stmt_with_decl */
1898         ;
1899
1900 all_iter_stmt_simple:
1901           FOR '(' primary ')'
1902           {
1903             /* The value returned by this action is  */
1904             /*      1 if everything is OK */
1905             /*      0 in case of error or already bound iterator */
1906
1907             $<itype>$ = 0;
1908             if (TREE_CODE ($3) != VAR_DECL)
1909               error ("invalid `for (ITERATOR)' syntax");
1910             else if (! ITERATOR_P ($3))
1911               error ("`%s' is not an iterator",
1912                      IDENTIFIER_POINTER (DECL_NAME ($3)));
1913             else if (ITERATOR_BOUND_P ($3))
1914               error ("`for (%s)' inside expansion of same iterator",
1915                      IDENTIFIER_POINTER (DECL_NAME ($3)));
1916             else
1917               {
1918                 $<itype>$ = 1;
1919                 iterator_for_loop_start ($3);
1920               }
1921           }
1922           lineno_labeled_stmt
1923           {
1924             if ($<itype>5)
1925               iterator_for_loop_end ($3);
1926           }
1927
1928 /*  This really should allow any kind of declaration,
1929     for generality.  Fix it before turning it back on.
1930
1931 all_iter_stmt_with_decl:
1932           FOR '(' ITERATOR pushlevel setspecs iterator_spec ')'
1933           {
1934 */          /* The value returned by this action is  */
1935             /*      1 if everything is OK */
1936             /*      0 in case of error or already bound iterator */
1937 /*
1938             iterator_for_loop_start ($6);
1939           }
1940           lineno_labeled_stmt
1941           {
1942             iterator_for_loop_end ($6);
1943             emit_line_note (input_filename, lineno);
1944             expand_end_bindings (getdecls (), 1, 0);
1945             $<ttype>$ = poplevel (1, 1, 0);
1946             if (yychar == CONSTANT || yychar == STRING)
1947               pop_momentary_nofree ();
1948             else
1949               pop_momentary ();
1950           }
1951 */
1952
1953 /* Any kind of label, including jump labels and case labels.
1954    ANSI C accepts labels only before statements, but we allow them
1955    also at the end of a compound statement.  */
1956
1957 label:    CASE expr_no_commas ':'
1958                 { register tree value = check_case_value ($2);
1959                   register tree label
1960                     = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
1961
1962                   stmt_count++;
1963
1964                   if (value != error_mark_node)
1965                     {
1966                       tree duplicate;
1967                       int success;
1968
1969                       if (pedantic && ! INTEGRAL_TYPE_P (TREE_TYPE (value)))
1970                         pedwarn ("label must have integral type in ANSI C");
1971
1972                       success = pushcase (value, convert_and_check,
1973                                           label, &duplicate);
1974
1975                       if (success == 1)
1976                         error ("case label not within a switch statement");
1977                       else if (success == 2)
1978                         {
1979                           error ("duplicate case value");
1980                           error_with_decl (duplicate, "this is the first entry for that value");
1981                         }
1982                       else if (success == 3)
1983                         warning ("case value out of range");
1984                       else if (success == 5)
1985                         error ("case label within scope of cleanup or variable array");
1986                     }
1987                   position_after_white_space (); }
1988         | CASE expr_no_commas ELLIPSIS expr_no_commas ':'
1989                 { register tree value1 = check_case_value ($2);
1990                   register tree value2 = check_case_value ($4);
1991                   register tree label
1992                     = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
1993
1994                   if (pedantic)
1995                     pedwarn ("ANSI C forbids case ranges");
1996                   stmt_count++;
1997
1998                   if (value1 != error_mark_node && value2 != error_mark_node)
1999                     {
2000                       tree duplicate;
2001                       int success = pushcase_range (value1, value2,
2002                                                     convert_and_check, label,
2003                                                     &duplicate);
2004                       if (success == 1)
2005                         error ("case label not within a switch statement");
2006                       else if (success == 2)
2007                         {
2008                           error ("duplicate case value");
2009                           error_with_decl (duplicate, "this is the first entry for that value");
2010                         }
2011                       else if (success == 3)
2012                         warning ("case value out of range");
2013                       else if (success == 4)
2014                         warning ("empty case range");
2015                       else if (success == 5)
2016                         error ("case label within scope of cleanup or variable array");
2017                     }
2018                   position_after_white_space (); }
2019         | DEFAULT ':'
2020                 {
2021                   tree duplicate;
2022                   register tree label
2023                     = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
2024                   int success = pushcase (NULL_TREE, 0, label, &duplicate);
2025                   stmt_count++;
2026                   if (success == 1)
2027                     error ("default label not within a switch statement");
2028                   else if (success == 2)
2029                     {
2030                       error ("multiple default labels in one switch");
2031                       error_with_decl (duplicate, "this is the first default label");
2032                     }
2033                   position_after_white_space (); }
2034         | identifier ':' maybe_attribute
2035                 { tree label = define_label (input_filename, lineno, $1);
2036                   stmt_count++;
2037                   emit_nop ();
2038                   if (label)
2039                     {
2040                       expand_label (label);
2041                       decl_attributes (label, $3, NULL_TREE);
2042                     }
2043                   position_after_white_space (); }
2044         ;
2045
2046 /* Either a type-qualifier or nothing.  First thing in an `asm' statement.  */
2047
2048 maybe_type_qual:
2049         /* empty */
2050                 { emit_line_note (input_filename, lineno);
2051                   $$ = NULL_TREE; }
2052         | TYPE_QUAL
2053                 { emit_line_note (input_filename, lineno); }
2054         ;
2055
2056 xexpr:
2057         /* empty */
2058                 { $$ = NULL_TREE; }
2059         | expr
2060         ;
2061
2062 /* These are the operands other than the first string and colon
2063    in  asm ("addextend %2,%1": "=dm" (x), "0" (y), "g" (*x))  */
2064 asm_operands: /* empty */
2065                 { $$ = NULL_TREE; }
2066         | nonnull_asm_operands
2067         ;
2068
2069 nonnull_asm_operands:
2070           asm_operand
2071         | nonnull_asm_operands ',' asm_operand
2072                 { $$ = chainon ($1, $3); }
2073         ;
2074
2075 asm_operand:
2076           STRING '(' expr ')'
2077                 { $$ = build_tree_list ($1, $3); }
2078         ;
2079
2080 asm_clobbers:
2081           string
2082                 { $$ = tree_cons (NULL_TREE, combine_strings ($1), NULL_TREE); }
2083         | asm_clobbers ',' string
2084                 { $$ = tree_cons (NULL_TREE, combine_strings ($3), $1); }
2085         ;
2086 \f
2087 /* This is what appears inside the parens in a function declarator.
2088    Its value is a list of ..._TYPE nodes.  */
2089 parmlist:
2090                 { pushlevel (0);
2091                   clear_parm_order ();
2092                   declare_parm_level (0); }
2093           parmlist_1
2094                 { $$ = $2;
2095                   parmlist_tags_warning ();
2096                   poplevel (0, 0, 0); }
2097         ;
2098
2099 parmlist_1:
2100           parmlist_2 ')'
2101         | parms ';'
2102                 { tree parm;
2103                   if (pedantic)
2104                     pedwarn ("ANSI C forbids forward parameter declarations");
2105                   /* Mark the forward decls as such.  */
2106                   for (parm = getdecls (); parm; parm = TREE_CHAIN (parm))
2107                     TREE_ASM_WRITTEN (parm) = 1;
2108                   clear_parm_order (); }
2109           parmlist_1
2110                 { $$ = $4; }
2111         | error ')'
2112                 { $$ = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); }
2113         ;
2114
2115 /* This is what appears inside the parens in a function declarator.
2116    Is value is represented in the format that grokdeclarator expects.  */
2117 parmlist_2:  /* empty */
2118                 { $$ = get_parm_info (0); }
2119         | ELLIPSIS
2120                 { $$ = get_parm_info (0);
2121                   /* Gcc used to allow this as an extension.  However, it does
2122                      not work for all targets, and thus has been disabled.
2123                      Also, since func (...) and func () are indistinguishable,
2124                      it caused problems with the code in expand_builtin which
2125                      tries to verify that BUILT_IN_NEXT_ARG is being used
2126                      correctly.  */
2127                   error ("ANSI C requires a named argument before `...'");
2128                 }
2129         | parms
2130                 { $$ = get_parm_info (1); }
2131         | parms ',' ELLIPSIS
2132                 { $$ = get_parm_info (0); }
2133         ;
2134
2135 parms:
2136         parm
2137                 { push_parm_decl ($1); }
2138         | parms ',' parm
2139                 { push_parm_decl ($3); }
2140         ;
2141
2142 /* A single parameter declaration or parameter type name,
2143    as found in a parmlist.  */
2144 parm:
2145           typed_declspecs setspecs parm_declarator maybe_attribute
2146                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2147                                                          $3),
2148                                         build_tree_list (prefix_attributes,
2149                                                          $4));
2150                   current_declspecs = TREE_VALUE (declspec_stack);
2151                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2152                   declspec_stack = TREE_CHAIN (declspec_stack);
2153                   resume_momentary ($2); }
2154         | typed_declspecs setspecs notype_declarator maybe_attribute
2155                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2156                                                          $3),
2157                                         build_tree_list (prefix_attributes,
2158                                                          $4));
2159                   current_declspecs = TREE_VALUE (declspec_stack);
2160                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2161                   declspec_stack = TREE_CHAIN (declspec_stack);
2162                   resume_momentary ($2); }
2163         | typed_declspecs setspecs absdcl maybe_attribute
2164                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2165                                                          $3),
2166                                         build_tree_list (prefix_attributes,
2167                                                          $4));
2168                   current_declspecs = TREE_VALUE (declspec_stack);
2169                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2170                   declspec_stack = TREE_CHAIN (declspec_stack);
2171                   resume_momentary ($2); }
2172         | declmods setspecs notype_declarator maybe_attribute
2173                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2174                                                          $3),
2175                                         build_tree_list (prefix_attributes,
2176                                                          $4));
2177                   current_declspecs = TREE_VALUE (declspec_stack);
2178                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2179                   declspec_stack = TREE_CHAIN (declspec_stack);
2180                   resume_momentary ($2);  }
2181
2182         | declmods setspecs absdcl maybe_attribute
2183                 { $$ = build_tree_list (build_tree_list (current_declspecs,
2184                                                          $3),
2185                                         build_tree_list (prefix_attributes,
2186                                                          $4));
2187                   current_declspecs = TREE_VALUE (declspec_stack);
2188                   prefix_attributes = TREE_PURPOSE (declspec_stack);
2189                   declspec_stack = TREE_CHAIN (declspec_stack);
2190                   resume_momentary ($2);  }
2191         ;
2192
2193 /* This is used in a function definition
2194    where either a parmlist or an identifier list is ok.
2195    Its value is a list of ..._TYPE nodes or a list of identifiers.  */
2196 parmlist_or_identifiers:
2197                 { pushlevel (0);
2198                   clear_parm_order ();
2199                   declare_parm_level (1); }
2200           parmlist_or_identifiers_1
2201                 { $$ = $2;
2202                   parmlist_tags_warning ();
2203                   poplevel (0, 0, 0); }
2204         ;
2205
2206 parmlist_or_identifiers_1:
2207           parmlist_1
2208         | identifiers ')'
2209                 { tree t;
2210                   for (t = $1; t; t = TREE_CHAIN (t))
2211                     if (TREE_VALUE (t) == NULL_TREE)
2212                       error ("`...' in old-style identifier list");
2213                   $$ = tree_cons (NULL_TREE, NULL_TREE, $1); }
2214         ;
2215
2216 /* A nonempty list of identifiers.  */
2217 identifiers:
2218         IDENTIFIER
2219                 { $$ = build_tree_list (NULL_TREE, $1); }
2220         | identifiers ',' IDENTIFIER
2221                 { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
2222         ;
2223
2224 /* A nonempty list of identifiers, including typenames.  */
2225 identifiers_or_typenames:
2226         identifier
2227                 { $$ = build_tree_list (NULL_TREE, $1); }
2228         | identifiers_or_typenames ',' identifier
2229                 { $$ = chainon ($1, build_tree_list (NULL_TREE, $3)); }
2230         ;
2231
2232 extension:
2233         EXTENSION
2234                 { $<itype>$ = pedantic;
2235                   pedantic = 0; }
2236         ;
2237 \f
2238 %%