gdb/c-exp.y

   1 /* YACC parser for C expressions, for GDB.
   2    Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Parse a C expression from text in a string,
  21    and return the result as a  struct expression  pointer.
  22    That structure contains arithmetic operations in reverse polish,
  23    with constants represented by operations that are followed by special data.
  24    See expression.h for the details of the format.
  25    What is important here is that it can be built up sequentially
  26    during the process of parsing; the lower levels of the tree always
  27    come first in the result.
  28
  29    Note that malloc's and realloc's in this file are transformed to
  30    xmalloc and xrealloc respectively by the same sed command in the
  31    makefile that remaps any other malloc/realloc inserted by the parser
  32    generator.  Doing this with #defines and trying to control the interaction
  33    with include files (<malloc.h> and <stdlib.h> for example) just became
  34    too messy, particularly when such includes can be inserted at random
  35    times by the parser generator.  */
  36
  37 %{
  38
  39 #include <stdio.h>
  40 #include <string.h>
  41 #include "defs.h"
  42 #include "symtab.h"
  43 #include "gdbtypes.h"
  44 #include "frame.h"
  45 #include "expression.h"
  46 #include "parser-defs.h"
  47 #include "value.h"
  48 #include "language.h"
  49 #include "bfd.h"
  50 #include "symfile.h"
  51 #include "objfiles.h"
  52
  53 /* These MUST be included in any grammar file!!!! Please choose unique names!
  54    Note that this are a combined list of variables that can be produced
  55    by any one of bison, byacc, or yacc. */
  56 #define yymaxdepth c_maxdepth
  57 #define yyparse c_parse
  58 #define yylex   c_lex
  59 #define yyerror c_error
  60 #define yylval  c_lval
  61 #define yychar  c_char
  62 #define yydebug c_debug
  63 #define yypact  c_pact
  64 #define yyr1    c_r1
  65 #define yyr2    c_r2
  66 #define yydef   c_def
  67 #define yychk   c_chk
  68 #define yypgo   c_pgo
  69 #define yyact   c_act
  70 #define yyexca  c_exca
  71 #define yyerrflag c_errflag
  72 #define yynerrs c_nerrs
  73 #define yyps    c_ps
  74 #define yypv    c_pv
  75 #define yys     c_s
  76 #define yy_yys  c_yys
  77 #define yystate c_state
  78 #define yytmp   c_tmp
  79 #define yyv     c_v
  80 #define yy_yyv  c_yyv
  81 #define yyval   c_val
  82 #define yylloc  c_lloc
  83 #define yyss    c_yyss          /* byacc */
  84 #define yyssp   c_yysp          /* byacc */
  85 #define yyvs    c_yyvs          /* byacc */
  86 #define yyvsp   c_yyvsp         /* byacc */
  87
  88 int
  89 yyparse PARAMS ((void));
  90
  91 int
  92 yylex PARAMS ((void));
  93
  94 void
  95 yyerror PARAMS ((char *));
  96
  97 /* #define      YYDEBUG 1 */
  98
  99 %}
 100
 101 /* Although the yacc "value" of an expression is not used,
 102    since the result is stored in the structure being created,
 103    other node types do have values.  */
 104
 105 %union
 106   {
 107     LONGEST lval;
 108     unsigned LONGEST ulval;
 109     struct {
 110       LONGEST val;
 111       struct type *type;
 112     } typed_val;
 113     double dval;
 114     struct symbol *sym;
 115     struct type *tval;
 116     struct stoken sval;
 117     struct ttype tsym;
 118     struct symtoken ssym;
 119     int voidval;
 120     struct block *bval;
 121     enum exp_opcode opcode;
 122     struct internalvar *ivar;
 123
 124     struct type **tvec;
 125     int *ivec;
 126   }
 127
 128 %{
 129 /* YYSTYPE gets defined by %union */
 130 static int
 131 parse_number PARAMS ((char *, int, int, YYSTYPE *));
 132 %}
 133
 134 %type <voidval> exp exp1 type_exp start variable qualified_name
 135 %type <tval> type typebase
 136 %type <tvec> nonempty_typelist
 137 /* %type <bval> block */
 138
 139 /* Fancy type parsing.  */
 140 %type <voidval> func_mod direct_abs_decl abs_decl
 141 %type <tval> ptype
 142 %type <lval> array_mod
 143
 144 %token <typed_val> INT
 145 %token <dval> FLOAT
 146
 147 /* Both NAME and TYPENAME tokens represent symbols in the input,
 148    and both convey their data as strings.
 149    But a TYPENAME is a string that happens to be defined as a typedef
 150    or builtin type name (such as int or char)
 151    and a NAME is any other symbol.
 152    Contexts where this distinction is not important can use the
 153    nonterminal "name", which matches either NAME or TYPENAME.  */
 154
 155 %token <sval> STRING
 156 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
 157 %token <tsym> TYPENAME
 158 %type <sval> name
 159 %type <ssym> name_not_typename
 160 %type <tsym> typename
 161
 162 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
 163    but which would parse as a valid number in the current input radix.
 164    E.g. "c" when input_radix==16.  Depending on the parse, it will be
 165    turned into a name or into a number.  */
 166
 167 %token <ssym> NAME_OR_INT
 168
 169 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
 170 %token TEMPLATE
 171 %token ERROR
 172
 173 /* Special type cases, put in to allow the parser to distinguish different
 174    legal basetypes.  */
 175 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD
 176 %token <lval> LAST REGNAME
 177
 178 %token <ivar> VARIABLE
 179
 180 %token <opcode> ASSIGN_MODIFY
 181
 182 /* C++ */
 183 %token THIS
 184
 185 %left ','
 186 %left ABOVE_COMMA
 187 %right '=' ASSIGN_MODIFY
 188 %right '?'
 189 %left OROR
 190 %left ANDAND
 191 %left '|'
 192 %left '^'
 193 %left '&'
 194 %left EQUAL NOTEQUAL
 195 %left '<' '>' LEQ GEQ
 196 %left LSH RSH
 197 %left '@'
 198 %left '+' '-'
 199 %left '*' '/' '%'
 200 %right UNARY INCREMENT DECREMENT
 201 %right ARROW '.' '[' '('
 202 %token <ssym> BLOCKNAME
 203 %type <bval> block
 204 %left COLONCOLON
 205
 206 \f
 207 %%
 208
 209 start   :       exp1
 210         |       type_exp
 211         ;
 212
 213 type_exp:       type
 214                         { write_exp_elt_opcode(OP_TYPE);
 215                           write_exp_elt_type($1);
 216                           write_exp_elt_opcode(OP_TYPE);}
 217         ;
 218
 219 /* Expressions, including the comma operator.  */
 220 exp1    :       exp
 221         |       exp1 ',' exp
 222                         { write_exp_elt_opcode (BINOP_COMMA); }
 223         ;
 224
 225 /* Expressions, not including the comma operator.  */
 226 exp     :       '*' exp    %prec UNARY
 227                         { write_exp_elt_opcode (UNOP_IND); }
 228
 229 exp     :       '&' exp    %prec UNARY
 230                         { write_exp_elt_opcode (UNOP_ADDR); }
 231
 232 exp     :       '-' exp    %prec UNARY
 233                         { write_exp_elt_opcode (UNOP_NEG); }
 234         ;
 235
 236 exp     :       '!' exp    %prec UNARY
 237                         { write_exp_elt_opcode (UNOP_ZEROP); }
 238         ;
 239
 240 exp     :       '~' exp    %prec UNARY
 241                         { write_exp_elt_opcode (UNOP_LOGNOT); }
 242         ;
 243
 244 exp     :       INCREMENT exp    %prec UNARY
 245                         { write_exp_elt_opcode (UNOP_PREINCREMENT); }
 246         ;
 247
 248 exp     :       DECREMENT exp    %prec UNARY
 249                         { write_exp_elt_opcode (UNOP_PREDECREMENT); }
 250         ;
 251
 252 exp     :       exp INCREMENT    %prec UNARY
 253                         { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
 254         ;
 255
 256 exp     :       exp DECREMENT    %prec UNARY
 257                         { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
 258         ;
 259
 260 exp     :       SIZEOF exp       %prec UNARY
 261                         { write_exp_elt_opcode (UNOP_SIZEOF); }
 262         ;
 263
 264 exp     :       exp ARROW name
 265                         { write_exp_elt_opcode (STRUCTOP_PTR);
 266                           write_exp_string ($3);
 267                           write_exp_elt_opcode (STRUCTOP_PTR); }
 268         ;
 269
 270 exp     :       exp ARROW qualified_name
 271                         { /* exp->type::name becomes exp->*(&type::name) */
 272                           /* Note: this doesn't work if name is a
 273                              static member!  FIXME */
 274                           write_exp_elt_opcode (UNOP_ADDR);
 275                           write_exp_elt_opcode (STRUCTOP_MPTR); }
 276         ;
 277 exp     :       exp ARROW '*' exp
 278                         { write_exp_elt_opcode (STRUCTOP_MPTR); }
 279         ;
 280
 281 exp     :       exp '.' name
 282                         { write_exp_elt_opcode (STRUCTOP_STRUCT);
 283                           write_exp_string ($3);
 284                           write_exp_elt_opcode (STRUCTOP_STRUCT); }
 285         ;
 286
 287 exp     :       exp '.' qualified_name
 288                         { /* exp.type::name becomes exp.*(&type::name) */
 289                           /* Note: this doesn't work if name is a
 290                              static member!  FIXME */
 291                           write_exp_elt_opcode (UNOP_ADDR);
 292                           write_exp_elt_opcode (STRUCTOP_MEMBER); }
 293         ;
 294
 295 exp     :       exp '.' '*' exp
 296                         { write_exp_elt_opcode (STRUCTOP_MEMBER); }
 297         ;
 298
 299 exp     :       exp '[' exp1 ']'
 300                         { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
 301         ;
 302
 303 exp     :       exp '('
 304                         /* This is to save the value of arglist_len
 305                            being accumulated by an outer function call.  */
 306                         { start_arglist (); }
 307                 arglist ')'     %prec ARROW
 308                         { write_exp_elt_opcode (OP_FUNCALL);
 309                           write_exp_elt_longcst ((LONGEST) end_arglist ());
 310                           write_exp_elt_opcode (OP_FUNCALL); }
 311         ;
 312
 313 arglist :
 314         ;
 315
 316 arglist :       exp
 317                         { arglist_len = 1; }
 318         ;
 319
 320 arglist :       arglist ',' exp   %prec ABOVE_COMMA
 321                         { arglist_len++; }
 322         ;
 323
 324 exp     :       '{' type '}' exp  %prec UNARY
 325                         { write_exp_elt_opcode (UNOP_MEMVAL);
 326                           write_exp_elt_type ($2);
 327                           write_exp_elt_opcode (UNOP_MEMVAL); }
 328         ;
 329
 330 exp     :       '(' type ')' exp  %prec UNARY
 331                         { write_exp_elt_opcode (UNOP_CAST);
 332                           write_exp_elt_type ($2);
 333                           write_exp_elt_opcode (UNOP_CAST); }
 334         ;
 335
 336 exp     :       '(' exp1 ')'
 337                         { }
 338         ;
 339
 340 /* Binary operators in order of decreasing precedence.  */
 341
 342 exp     :       exp '@' exp
 343                         { write_exp_elt_opcode (BINOP_REPEAT); }
 344         ;
 345
 346 exp     :       exp '*' exp
 347                         { write_exp_elt_opcode (BINOP_MUL); }
 348         ;
 349
 350 exp     :       exp '/' exp
 351                         { write_exp_elt_opcode (BINOP_DIV); }
 352         ;
 353
 354 exp     :       exp '%' exp
 355                         { write_exp_elt_opcode (BINOP_REM); }
 356         ;
 357
 358 exp     :       exp '+' exp
 359                         { write_exp_elt_opcode (BINOP_ADD); }
 360         ;
 361
 362 exp     :       exp '-' exp
 363                         { write_exp_elt_opcode (BINOP_SUB); }
 364         ;
 365
 366 exp     :       exp LSH exp
 367                         { write_exp_elt_opcode (BINOP_LSH); }
 368         ;
 369
 370 exp     :       exp RSH exp
 371                         { write_exp_elt_opcode (BINOP_RSH); }
 372         ;
 373
 374 exp     :       exp EQUAL exp
 375                         { write_exp_elt_opcode (BINOP_EQUAL); }
 376         ;
 377
 378 exp     :       exp NOTEQUAL exp
 379                         { write_exp_elt_opcode (BINOP_NOTEQUAL); }
 380         ;
 381
 382 exp     :       exp LEQ exp
 383                         { write_exp_elt_opcode (BINOP_LEQ); }
 384         ;
 385
 386 exp     :       exp GEQ exp
 387                         { write_exp_elt_opcode (BINOP_GEQ); }
 388         ;
 389
 390 exp     :       exp '<' exp
 391                         { write_exp_elt_opcode (BINOP_LESS); }
 392         ;
 393
 394 exp     :       exp '>' exp
 395                         { write_exp_elt_opcode (BINOP_GTR); }
 396         ;
 397
 398 exp     :       exp '&' exp
 399                         { write_exp_elt_opcode (BINOP_LOGAND); }
 400         ;
 401
 402 exp     :       exp '^' exp
 403                         { write_exp_elt_opcode (BINOP_LOGXOR); }
 404         ;
 405
 406 exp     :       exp '|' exp
 407                         { write_exp_elt_opcode (BINOP_LOGIOR); }
 408         ;
 409
 410 exp     :       exp ANDAND exp
 411                         { write_exp_elt_opcode (BINOP_AND); }
 412         ;
 413
 414 exp     :       exp OROR exp
 415                         { write_exp_elt_opcode (BINOP_OR); }
 416         ;
 417
 418 exp     :       exp '?' exp ':' exp     %prec '?'
 419                         { write_exp_elt_opcode (TERNOP_COND); }
 420         ;
 421
 422 exp     :       exp '=' exp
 423                         { write_exp_elt_opcode (BINOP_ASSIGN); }
 424         ;
 425
 426 exp     :       exp ASSIGN_MODIFY exp
 427                         { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
 428                           write_exp_elt_opcode ($2);
 429                           write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
 430         ;
 431
 432 exp     :       INT
 433                         { write_exp_elt_opcode (OP_LONG);
 434                           write_exp_elt_type ($1.type);
 435                           write_exp_elt_longcst ((LONGEST)($1.val));
 436                           write_exp_elt_opcode (OP_LONG); }
 437         ;
 438
 439 exp     :       NAME_OR_INT
 440                         { YYSTYPE val;
 441                           parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
 442                           write_exp_elt_opcode (OP_LONG);
 443                           write_exp_elt_type (val.typed_val.type);
 444                           write_exp_elt_longcst ((LONGEST)val.typed_val.val);
 445                           write_exp_elt_opcode (OP_LONG);
 446                         }
 447         ;
 448
 449
 450 exp     :       FLOAT
 451                         { write_exp_elt_opcode (OP_DOUBLE);
 452                           write_exp_elt_type (builtin_type_double);
 453                           write_exp_elt_dblcst ($1);
 454                           write_exp_elt_opcode (OP_DOUBLE); }
 455         ;
 456
 457 exp     :       variable
 458         ;
 459
 460 exp     :       LAST
 461                         { write_exp_elt_opcode (OP_LAST);
 462                           write_exp_elt_longcst ((LONGEST) $1);
 463                           write_exp_elt_opcode (OP_LAST); }
 464         ;
 465
 466 exp     :       REGNAME
 467                         { write_exp_elt_opcode (OP_REGISTER);
 468                           write_exp_elt_longcst ((LONGEST) $1);
 469                           write_exp_elt_opcode (OP_REGISTER); }
 470         ;
 471
 472 exp     :       VARIABLE
 473                         { write_exp_elt_opcode (OP_INTERNALVAR);
 474                           write_exp_elt_intern ($1);
 475                           write_exp_elt_opcode (OP_INTERNALVAR); }
 476         ;
 477
 478 exp     :       SIZEOF '(' type ')'     %prec UNARY
 479                         { write_exp_elt_opcode (OP_LONG);
 480                           write_exp_elt_type (builtin_type_int);
 481                           write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
 482                           write_exp_elt_opcode (OP_LONG); }
 483         ;
 484
 485 exp     :       STRING
 486                         { write_exp_elt_opcode (OP_STRING);
 487                           write_exp_string ($1);
 488                           write_exp_elt_opcode (OP_STRING); }
 489         ;
 490
 491 /* C++.  */
 492 exp     :       THIS
 493                         { write_exp_elt_opcode (OP_THIS);
 494                           write_exp_elt_opcode (OP_THIS); }
 495         ;
 496
 497 /* end of C++.  */
 498
 499 block   :       BLOCKNAME
 500                         {
 501                           if ($1.sym != 0)
 502                               $$ = SYMBOL_BLOCK_VALUE ($1.sym);
 503                           else
 504                             {
 505                               struct symtab *tem =
 506                                   lookup_symtab (copy_name ($1.stoken));
 507                               if (tem)
 508                                 $$ = BLOCKVECTOR_BLOCK
 509                                          (BLOCKVECTOR (tem), STATIC_BLOCK);
 510                               else
 511                                 error ("No file or function \"%s\".",
 512                                        copy_name ($1.stoken));
 513                             }
 514                         }
 515         ;
 516
 517 block   :       block COLONCOLON name
 518                         { struct symbol *tem
 519                             = lookup_symbol (copy_name ($3), $1,
 520                                              VAR_NAMESPACE, 0, NULL);
 521                           if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
 522                             error ("No function \"%s\" in specified context.",
 523                                    copy_name ($3));
 524                           $$ = SYMBOL_BLOCK_VALUE (tem); }
 525         ;
 526
 527 variable:       block COLONCOLON name
 528                         { struct symbol *sym;
 529                           sym = lookup_symbol (copy_name ($3), $1,
 530                                                VAR_NAMESPACE, 0, NULL);
 531                           if (sym == 0)
 532                             error ("No symbol \"%s\" in specified context.",
 533                                    copy_name ($3));
 534
 535                           write_exp_elt_opcode (OP_VAR_VALUE);
 536                           write_exp_elt_sym (sym);
 537                           write_exp_elt_opcode (OP_VAR_VALUE); }
 538         ;
 539
 540 qualified_name: typebase COLONCOLON name
 541                         {
 542                           struct type *type = $1;
 543                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 544                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 545                             error ("`%s' is not defined as an aggregate type.",
 546                                    TYPE_NAME (type));
 547
 548                           write_exp_elt_opcode (OP_SCOPE);
 549                           write_exp_elt_type (type);
 550                           write_exp_string ($3);
 551                           write_exp_elt_opcode (OP_SCOPE);
 552                         }
 553         |       typebase COLONCOLON '~' name
 554                         {
 555                           struct type *type = $1;
 556                           struct stoken tmp_token;
 557                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 558                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 559                             error ("`%s' is not defined as an aggregate type.",
 560                                    TYPE_NAME (type));
 561
 562                           if (strcmp (type_name_no_tag (type), $4.ptr))
 563                             error ("invalid destructor `%s::~%s'",
 564                                    type_name_no_tag (type), $4.ptr);
 565
 566                           tmp_token.ptr = (char*) alloca ($4.length + 2);
 567                           tmp_token.length = $4.length + 1;
 568                           tmp_token.ptr[0] = '~';
 569                           memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
 570                           tmp_token.ptr[tmp_token.length] = 0;
 571                           write_exp_elt_opcode (OP_SCOPE);
 572                           write_exp_elt_type (type);
 573                           write_exp_string (tmp_token);
 574                           write_exp_elt_opcode (OP_SCOPE);
 575                         }
 576         ;
 577
 578 variable:       qualified_name
 579         |       COLONCOLON name
 580                         {
 581                           char *name = copy_name ($2);
 582                           struct symbol *sym;
 583                           struct minimal_symbol *msymbol;
 584
 585                           sym =
 586                             lookup_symbol (name, 0, VAR_NAMESPACE, 0, NULL);
 587                           if (sym)
 588                             {
 589                               write_exp_elt_opcode (OP_VAR_VALUE);
 590                               write_exp_elt_sym (sym);
 591                               write_exp_elt_opcode (OP_VAR_VALUE);
 592                               break;
 593                             }
 594
 595                           msymbol = lookup_minimal_symbol (name,
 596                                       (struct objfile *) NULL);
 597                           if (msymbol != NULL)
 598                             {
 599                               write_exp_elt_opcode (OP_LONG);
 600                               write_exp_elt_type (builtin_type_int);
 601                               write_exp_elt_longcst ((LONGEST) msymbol -> address);
 602                               write_exp_elt_opcode (OP_LONG);
 603                               write_exp_elt_opcode (UNOP_MEMVAL);
 604                               if (msymbol -> type == mst_data ||
 605                                   msymbol -> type == mst_bss)
 606                                 write_exp_elt_type (builtin_type_int);
 607                               else if (msymbol -> type == mst_text)
 608                                 write_exp_elt_type (lookup_function_type (builtin_type_int));
 609                               else
 610                                 write_exp_elt_type (builtin_type_char);
 611                               write_exp_elt_opcode (UNOP_MEMVAL);
 612                             }
 613                           else
 614                             if (!have_full_symbols () && !have_partial_symbols ())
 615                               error ("No symbol table is loaded.  Use the \"file\" command.");
 616                             else
 617                               error ("No symbol \"%s\" in current context.", name);
 618                         }
 619         ;
 620
 621 variable:       name_not_typename
 622                         { struct symbol *sym = $1.sym;
 623
 624                           if (sym)
 625                             {
 626                               switch (SYMBOL_CLASS (sym))
 627                                 {
 628                                 case LOC_REGISTER:
 629                                 case LOC_ARG:
 630                                 case LOC_REF_ARG:
 631                                 case LOC_REGPARM:
 632                                 case LOC_LOCAL:
 633                                 case LOC_LOCAL_ARG:
 634                                   if (innermost_block == 0 ||
 635                                       contained_in (block_found,
 636                                                     innermost_block))
 637                                     innermost_block = block_found;
 638                                 case LOC_UNDEF:
 639                                 case LOC_CONST:
 640                                 case LOC_STATIC:
 641                                 case LOC_TYPEDEF:
 642                                 case LOC_LABEL:
 643                                 case LOC_BLOCK:
 644                                 case LOC_CONST_BYTES:
 645
 646                                   /* In this case the expression can
 647                                      be evaluated regardless of what
 648                                      frame we are in, so there is no
 649                                      need to check for the
 650                                      innermost_block.  These cases are
 651                                      listed so that gcc -Wall will
 652                                      report types that may not have
 653                                      been considered.  */
 654
 655                                   break;
 656                                 }
 657                               write_exp_elt_opcode (OP_VAR_VALUE);
 658                               write_exp_elt_sym (sym);
 659                               write_exp_elt_opcode (OP_VAR_VALUE);
 660                             }
 661                           else if ($1.is_a_field_of_this)
 662                             {
 663                               /* C++: it hangs off of `this'.  Must
 664                                  not inadvertently convert from a method call
 665                                  to data ref.  */
 666                               if (innermost_block == 0 ||
 667                                   contained_in (block_found, innermost_block))
 668                                 innermost_block = block_found;
 669                               write_exp_elt_opcode (OP_THIS);
 670                               write_exp_elt_opcode (OP_THIS);
 671                               write_exp_elt_opcode (STRUCTOP_PTR);
 672                               write_exp_string ($1.stoken);
 673                               write_exp_elt_opcode (STRUCTOP_PTR);
 674                             }
 675                           else
 676                             {
 677                               struct minimal_symbol *msymbol;
 678                               register char *arg = copy_name ($1.stoken);
 679
 680                               msymbol = lookup_minimal_symbol (arg,
 681                                           (struct objfile *) NULL);
 682                               if (msymbol != NULL)
 683                                 {
 684                                   write_exp_elt_opcode (OP_LONG);
 685                                   write_exp_elt_type (builtin_type_int);
 686                                   write_exp_elt_longcst ((LONGEST) msymbol -> address);
 687                                   write_exp_elt_opcode (OP_LONG);
 688                                   write_exp_elt_opcode (UNOP_MEMVAL);
 689                                   if (msymbol -> type == mst_data ||
 690                                       msymbol -> type == mst_bss)
 691                                     write_exp_elt_type (builtin_type_int);
 692                                   else if (msymbol -> type == mst_text)
 693                                     write_exp_elt_type (lookup_function_type (builtin_type_int));
 694                                   else
 695                                     write_exp_elt_type (builtin_type_char);
 696                                   write_exp_elt_opcode (UNOP_MEMVAL);
 697                                 }
 698                               else if (!have_full_symbols () && !have_partial_symbols ())
 699                                 error ("No symbol table is loaded.  Use the \"file\" command.");
 700                               else
 701                                 error ("No symbol \"%s\" in current context.",
 702                                        copy_name ($1.stoken));
 703                             }
 704                         }
 705         ;
 706
 707
 708 ptype   :       typebase
 709         |       typebase abs_decl
 710                 {
 711                   /* This is where the interesting stuff happens.  */
 712                   int done = 0;
 713                   int array_size;
 714                   struct type *follow_type = $1;
 715
 716                   while (!done)
 717                     switch (pop_type ())
 718                       {
 719                       case tp_end:
 720                         done = 1;
 721                         break;
 722                       case tp_pointer:
 723                         follow_type = lookup_pointer_type (follow_type);
 724                         break;
 725                       case tp_reference:
 726                         follow_type = lookup_reference_type (follow_type);
 727                         break;
 728                       case tp_array:
 729                         array_size = pop_type_int ();
 730                         if (array_size != -1)
 731                           follow_type = create_array_type (follow_type,
 732                                                            array_size);
 733                         else
 734                           follow_type = lookup_pointer_type (follow_type);
 735                         break;
 736                       case tp_function:
 737                         follow_type = lookup_function_type (follow_type);
 738                         break;
 739                       }
 740                   $$ = follow_type;
 741                 }
 742         ;
 743
 744 abs_decl:       '*'
 745                         { push_type (tp_pointer); $$ = 0; }
 746         |       '*' abs_decl
 747                         { push_type (tp_pointer); $$ = $2; }
 748         |       '&'
 749                         { push_type (tp_reference); $$ = 0; }
 750         |       '&' abs_decl
 751                         { push_type (tp_reference); $$ = $2; }
 752         |       direct_abs_decl
 753         ;
 754
 755 direct_abs_decl: '(' abs_decl ')'
 756                         { $$ = $2; }
 757         |       direct_abs_decl array_mod
 758                         {
 759                           push_type_int ($2);
 760                           push_type (tp_array);
 761                         }
 762         |       array_mod
 763                         {
 764                           push_type_int ($1);
 765                           push_type (tp_array);
 766                           $$ = 0;
 767                         }
 768         |       direct_abs_decl func_mod
 769                         { push_type (tp_function); }
 770         |       func_mod
 771                         { push_type (tp_function); }
 772         ;
 773
 774 array_mod:      '[' ']'
 775                         { $$ = -1; }
 776         |       '[' INT ']'
 777                         { $$ = $2.val; }
 778         ;
 779
 780 func_mod:       '(' ')'
 781                         { $$ = 0; }
 782         |       '(' nonempty_typelist ')'
 783                         { free ((PTR)$2); $$ = 0; }
 784         ;
 785
 786 type    :       ptype
 787         |       typebase COLONCOLON '*'
 788                         { $$ = lookup_member_type (builtin_type_int, $1); }
 789         |       type '(' typebase COLONCOLON '*' ')'
 790                         { $$ = lookup_member_type ($1, $3); }
 791         |       type '(' typebase COLONCOLON '*' ')' '(' ')'
 792                         { $$ = lookup_member_type
 793                             (lookup_function_type ($1), $3); }
 794         |       type '(' typebase COLONCOLON '*' ')' '(' nonempty_typelist ')'
 795                         { $$ = lookup_member_type
 796                             (lookup_function_type ($1), $3);
 797                           free ((PTR)$8); }
 798         ;
 799
 800 typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 801         :       TYPENAME
 802                         { $$ = $1.type; }
 803         |       INT_KEYWORD
 804                         { $$ = builtin_type_int; }
 805         |       LONG
 806                         { $$ = builtin_type_long; }
 807         |       SHORT
 808                         { $$ = builtin_type_short; }
 809         |       LONG INT_KEYWORD
 810                         { $$ = builtin_type_long; }
 811         |       UNSIGNED LONG INT_KEYWORD
 812                         { $$ = builtin_type_unsigned_long; }
 813         |       LONG LONG
 814                         { $$ = builtin_type_long_long; }
 815         |       LONG LONG INT_KEYWORD
 816                         { $$ = builtin_type_long_long; }
 817         |       UNSIGNED LONG LONG
 818                         { $$ = builtin_type_unsigned_long_long; }
 819         |       UNSIGNED LONG LONG INT_KEYWORD
 820                         { $$ = builtin_type_unsigned_long_long; }
 821         |       SHORT INT_KEYWORD
 822                         { $$ = builtin_type_short; }
 823         |       UNSIGNED SHORT INT_KEYWORD
 824                         { $$ = builtin_type_unsigned_short; }
 825         |       STRUCT name
 826                         { $$ = lookup_struct (copy_name ($2),
 827                                               expression_context_block); }
 828         |       CLASS name
 829                         { $$ = lookup_struct (copy_name ($2),
 830                                               expression_context_block); }
 831         |       UNION name
 832                         { $$ = lookup_union (copy_name ($2),
 833                                              expression_context_block); }
 834         |       ENUM name
 835                         { $$ = lookup_enum (copy_name ($2),
 836                                             expression_context_block); }
 837         |       UNSIGNED typename
 838                         { $$ = lookup_unsigned_typename (TYPE_NAME($2.type)); }
 839         |       UNSIGNED
 840                         { $$ = builtin_type_unsigned_int; }
 841         |       SIGNED_KEYWORD typename
 842                         { $$ = lookup_signed_typename (TYPE_NAME($2.type)); }
 843         |       SIGNED_KEYWORD
 844                         { $$ = builtin_type_int; }
 845         |       TEMPLATE name '<' type '>'
 846                         { $$ = lookup_template_type(copy_name($2), $4,
 847                                                     expression_context_block);
 848                         }
 849         /* "const" and "volatile" are curently ignored. */
 850         |       CONST_KEYWORD typebase { $$ = $2; }
 851         |       VOLATILE_KEYWORD typebase { $$ = $2; }
 852         ;
 853
 854 typename:       TYPENAME
 855         |       INT_KEYWORD
 856                 {
 857                   $$.stoken.ptr = "int";
 858                   $$.stoken.length = 3;
 859                   $$.type = builtin_type_int;
 860                 }
 861         |       LONG
 862                 {
 863                   $$.stoken.ptr = "long";
 864                   $$.stoken.length = 4;
 865                   $$.type = builtin_type_long;
 866                 }
 867         |       SHORT
 868                 {
 869                   $$.stoken.ptr = "short";
 870                   $$.stoken.length = 5;
 871                   $$.type = builtin_type_short;
 872                 }
 873         ;
 874
 875 nonempty_typelist
 876         :       type
 877                 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
 878                   $<ivec>$[0] = 1;      /* Number of types in vector */
 879                   $$[1] = $1;
 880                 }
 881         |       nonempty_typelist ',' type
 882                 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
 883                   $$ = (struct type **) realloc ((char *) $1, len);
 884                   $$[$<ivec>$[0]] = $3;
 885                 }
 886         ;
 887
 888 name    :       NAME { $$ = $1.stoken; }
 889         |       BLOCKNAME { $$ = $1.stoken; }
 890         |       TYPENAME { $$ = $1.stoken; }
 891         |       NAME_OR_INT  { $$ = $1.stoken; }
 892         ;
 893
 894 name_not_typename :     NAME
 895         |       BLOCKNAME
 896 /* These would be useful if name_not_typename was useful, but it is just
 897    a fake for "variable", so these cause reduce/reduce conflicts because
 898    the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
 899    =exp) or just an exp.  If name_not_typename was ever used in an lvalue
 900    context where only a name could occur, this might be useful.
 901         |       NAME_OR_INT
 902  */
 903         ;
 904
 905 %%
 906
 907 /* Take care of parsing a number (anything that starts with a digit).
 908    Set yylval and return the token type; update lexptr.
 909    LEN is the number of characters in it.  */
 910
 911 /*** Needs some error checking for the float case ***/
 912
 913 static int
 914 parse_number (p, len, parsed_float, putithere)
 915      register char *p;
 916      register int len;
 917      int parsed_float;
 918      YYSTYPE *putithere;
 919 {
 920   register LONGEST n = 0;
 921   register LONGEST prevn = 0;
 922   register int i;
 923   register int c;
 924   register int base = input_radix;
 925   int unsigned_p = 0;
 926   int long_p = 0;
 927   LONGEST high_bit;
 928   struct type *signed_type;
 929   struct type *unsigned_type;
 930
 931   if (parsed_float)
 932     {
 933       /* It's a float since it contains a point or an exponent.  */
 934       putithere->dval = atof (p);
 935       return FLOAT;
 936     }
 937
 938   /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
 939   if (p[0] == '0')
 940     switch (p[1])
 941       {
 942       case 'x':
 943       case 'X':
 944         if (len >= 3)
 945           {
 946             p += 2;
 947             base = 16;
 948             len -= 2;
 949           }
 950         break;
 951
 952       case 't':
 953       case 'T':
 954       case 'd':
 955       case 'D':
 956         if (len >= 3)
 957           {
 958             p += 2;
 959             base = 10;
 960             len -= 2;
 961           }
 962         break;
 963
 964       default:
 965         base = 8;
 966         break;
 967       }
 968
 969   while (len-- > 0)
 970     {
 971       c = *p++;
 972       if (c >= 'A' && c <= 'Z')
 973         c += 'a' - 'A';
 974       if (c != 'l' && c != 'u')
 975         n *= base;
 976       if (c >= '0' && c <= '9')
 977         n += i = c - '0';
 978       else
 979         {
 980           if (base > 10 && c >= 'a' && c <= 'f')
 981             n += i = c - 'a' + 10;
 982           else if (len == 0 && c == 'l')
 983             long_p = 1;
 984           else if (len == 0 && c == 'u')
 985             unsigned_p = 1;
 986           else
 987             return ERROR;       /* Char not a digit */
 988         }
 989       if (i >= base)
 990         return ERROR;           /* Invalid digit in this base */
 991
 992       /* Portably test for overflow (only works for nonzero values, so make
 993          a second check for zero).  */
 994       if((prevn >= n) && n != 0)
 995          unsigned_p=1;          /* Try something unsigned */
 996       /* If range checking enabled, portably test for unsigned overflow.  */
 997       if(RANGE_CHECK && n!=0)
 998       {
 999          if((unsigned_p && (unsigned)prevn >= (unsigned)n))
1000             range_error("Overflow on numeric constant.");
1001       }
1002       prevn=n;
1003     }
1004
1005      /* If the number is too big to be an int, or it's got an l suffix
1006         then it's a long.  Work out if this has to be a long by
1007         shifting right and and seeing if anything remains, and the
1008         target int size is different to the target long size. */
1009
1010     if ((TARGET_INT_BIT != TARGET_LONG_BIT && (n >> TARGET_INT_BIT)) || long_p)
1011       {
1012          high_bit = ((LONGEST)1) << (TARGET_LONG_BIT-1);
1013          unsigned_type = builtin_type_unsigned_long;
1014          signed_type = builtin_type_long;
1015       }
1016     else
1017       {
1018          high_bit = ((LONGEST)1) << (TARGET_INT_BIT-1);
1019          unsigned_type = builtin_type_unsigned_int;
1020          signed_type = builtin_type_int;
1021       }
1022
1023    putithere->typed_val.val = n;
1024
1025    /* If the high bit of the worked out type is set then this number
1026       has to be unsigned. */
1027
1028    if (unsigned_p || (n & high_bit))
1029      {
1030         putithere->typed_val.type = unsigned_type;
1031      }
1032    else
1033      {
1034         putithere->typed_val.type = signed_type;
1035      }
1036
1037    return INT;
1038 }
1039
1040 struct token
1041 {
1042   char *operator;
1043   int token;
1044   enum exp_opcode opcode;
1045 };
1046
1047 const static struct token tokentab3[] =
1048   {
1049     {">>=", ASSIGN_MODIFY, BINOP_RSH},
1050     {"<<=", ASSIGN_MODIFY, BINOP_LSH}
1051   };
1052
1053 const static struct token tokentab2[] =
1054   {
1055     {"+=", ASSIGN_MODIFY, BINOP_ADD},
1056     {"-=", ASSIGN_MODIFY, BINOP_SUB},
1057     {"*=", ASSIGN_MODIFY, BINOP_MUL},
1058     {"/=", ASSIGN_MODIFY, BINOP_DIV},
1059     {"%=", ASSIGN_MODIFY, BINOP_REM},
1060     {"|=", ASSIGN_MODIFY, BINOP_LOGIOR},
1061     {"&=", ASSIGN_MODIFY, BINOP_LOGAND},
1062     {"^=", ASSIGN_MODIFY, BINOP_LOGXOR},
1063     {"++", INCREMENT, BINOP_END},
1064     {"--", DECREMENT, BINOP_END},
1065     {"->", ARROW, BINOP_END},
1066     {"&&", ANDAND, BINOP_END},
1067     {"||", OROR, BINOP_END},
1068     {"::", COLONCOLON, BINOP_END},
1069     {"<<", LSH, BINOP_END},
1070     {">>", RSH, BINOP_END},
1071     {"==", EQUAL, BINOP_END},
1072     {"!=", NOTEQUAL, BINOP_END},
1073     {"<=", LEQ, BINOP_END},
1074     {">=", GEQ, BINOP_END}
1075   };
1076
1077 /* Read one token, getting characters through lexptr.  */
1078
1079 int
1080 yylex ()
1081 {
1082   register int c;
1083   register int namelen;
1084   register unsigned i;
1085   register char *tokstart;
1086
1087  retry:
1088
1089   tokstart = lexptr;
1090   /* See if it is a special token of length 3.  */
1091   for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1092     if (!strncmp (tokstart, tokentab3[i].operator, 3))
1093       {
1094         lexptr += 3;
1095         yylval.opcode = tokentab3[i].opcode;
1096         return tokentab3[i].token;
1097       }
1098
1099   /* See if it is a special token of length 2.  */
1100   for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1101     if (!strncmp (tokstart, tokentab2[i].operator, 2))
1102       {
1103         lexptr += 2;
1104         yylval.opcode = tokentab2[i].opcode;
1105         return tokentab2[i].token;
1106       }
1107
1108   switch (c = *tokstart)
1109     {
1110     case 0:
1111       return 0;
1112
1113     case ' ':
1114     case '\t':
1115     case '\n':
1116       lexptr++;
1117       goto retry;
1118
1119     case '\'':
1120       /* We either have a character constant ('0' or '\177' for example)
1121          or we have a quoted symbol reference ('foo(int,int)' in C++
1122          for example). */
1123       lexptr++;
1124       c = *lexptr++;
1125       if (c == '\\')
1126         c = parse_escape (&lexptr);
1127
1128       yylval.typed_val.val = c;
1129       yylval.typed_val.type = builtin_type_char;
1130
1131       c = *lexptr++;
1132       if (c != '\'')
1133         {
1134           namelen = skip_quoted (tokstart) - tokstart;
1135           if (namelen > 2)
1136             {
1137               lexptr = tokstart + namelen;
1138               namelen -= 2;
1139               tokstart++;
1140               goto tryname;
1141             }
1142           error ("Invalid character constant.");
1143         }
1144       return INT;
1145
1146     case '(':
1147       paren_depth++;
1148       lexptr++;
1149       return c;
1150
1151     case ')':
1152       if (paren_depth == 0)
1153         return 0;
1154       paren_depth--;
1155       lexptr++;
1156       return c;
1157
1158     case ',':
1159       if (comma_terminates && paren_depth == 0)
1160         return 0;
1161       lexptr++;
1162       return c;
1163
1164     case '.':
1165       /* Might be a floating point number.  */
1166       if (lexptr[1] < '0' || lexptr[1] > '9')
1167         goto symbol;            /* Nope, must be a symbol. */
1168       /* FALL THRU into number case.  */
1169
1170     case '0':
1171     case '1':
1172     case '2':
1173     case '3':
1174     case '4':
1175     case '5':
1176     case '6':
1177     case '7':
1178     case '8':
1179     case '9':
1180       {
1181         /* It's a number.  */
1182         int got_dot = 0, got_e = 0, toktype;
1183         register char *p = tokstart;
1184         int hex = input_radix > 10;
1185
1186         if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1187           {
1188             p += 2;
1189             hex = 1;
1190           }
1191         else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1192           {
1193             p += 2;
1194             hex = 0;
1195           }
1196
1197         for (;; ++p)
1198           {
1199             if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1200               got_dot = got_e = 1;
1201             else if (!hex && !got_dot && *p == '.')
1202               got_dot = 1;
1203             else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1204                      && (*p == '-' || *p == '+'))
1205               /* This is the sign of the exponent, not the end of the
1206                  number.  */
1207               continue;
1208             /* We will take any letters or digits.  parse_number will
1209                complain if past the radix, or if L or U are not final.  */
1210             else if ((*p < '0' || *p > '9')
1211                      && ((*p < 'a' || *p > 'z')
1212                                   && (*p < 'A' || *p > 'Z')))
1213               break;
1214           }
1215         toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1216         if (toktype == ERROR)
1217           {
1218             char *err_copy = (char *) alloca (p - tokstart + 1);
1219
1220             memcpy (err_copy, tokstart, p - tokstart);
1221             err_copy[p - tokstart] = 0;
1222             error ("Invalid number \"%s\".", err_copy);
1223           }
1224         lexptr = p;
1225         return toktype;
1226       }
1227
1228     case '+':
1229     case '-':
1230     case '*':
1231     case '/':
1232     case '%':
1233     case '|':
1234     case '&':
1235     case '^':
1236     case '~':
1237     case '!':
1238     case '@':
1239     case '<':
1240     case '>':
1241     case '[':
1242     case ']':
1243     case '?':
1244     case ':':
1245     case '=':
1246     case '{':
1247     case '}':
1248     symbol:
1249       lexptr++;
1250       return c;
1251
1252     case '"':
1253       for (namelen = 1; (c = tokstart[namelen]) != '"'; namelen++)
1254         if (c == '\\')
1255           {
1256             c = tokstart[++namelen];
1257             if (c >= '0' && c <= '9')
1258               {
1259                 c = tokstart[++namelen];
1260                 if (c >= '0' && c <= '9')
1261                   c = tokstart[++namelen];
1262               }
1263           }
1264       yylval.sval.ptr = tokstart + 1;
1265       yylval.sval.length = namelen - 1;
1266       lexptr += namelen + 1;
1267       return STRING;
1268     }
1269
1270   if (!(c == '_' || c == '$'
1271         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1272     /* We must have come across a bad character (e.g. ';').  */
1273     error ("Invalid character '%c' in expression.", c);
1274
1275   /* It's a name.  See how long it is.  */
1276   namelen = 0;
1277   for (c = tokstart[namelen];
1278        (c == '_' || c == '$' || (c >= '0' && c <= '9')
1279         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
1280        c = tokstart[++namelen])
1281     ;
1282
1283   /* The token "if" terminates the expression and is NOT
1284      removed from the input stream.  */
1285   if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
1286     {
1287       return 0;
1288     }
1289
1290   lexptr += namelen;
1291
1292   /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
1293      and $$digits (equivalent to $<-digits> if you could type that).
1294      Make token type LAST, and put the number (the digits) in yylval.  */
1295
1296   tryname:
1297   if (*tokstart == '$')
1298     {
1299       register int negate = 0;
1300       c = 1;
1301       /* Double dollar means negate the number and add -1 as well.
1302          Thus $$ alone means -1.  */
1303       if (namelen >= 2 && tokstart[1] == '$')
1304         {
1305           negate = 1;
1306           c = 2;
1307         }
1308       if (c == namelen)
1309         {
1310           /* Just dollars (one or two) */
1311           yylval.lval = - negate;
1312           return LAST;
1313         }
1314       /* Is the rest of the token digits?  */
1315       for (; c < namelen; c++)
1316         if (!(tokstart[c] >= '0' && tokstart[c] <= '9'))
1317           break;
1318       if (c == namelen)
1319         {
1320           yylval.lval = atoi (tokstart + 1 + negate);
1321           if (negate)
1322             yylval.lval = - yylval.lval;
1323           return LAST;
1324         }
1325     }
1326
1327   /* Handle tokens that refer to machine registers:
1328      $ followed by a register name.  */
1329
1330   if (*tokstart == '$') {
1331     for (c = 0; c < NUM_REGS; c++)
1332       if (namelen - 1 == strlen (reg_names[c])
1333           && !strncmp (tokstart + 1, reg_names[c], namelen - 1))
1334         {
1335           yylval.lval = c;
1336           return REGNAME;
1337         }
1338     for (c = 0; c < num_std_regs; c++)
1339      if (namelen - 1 == strlen (std_regs[c].name)
1340          && !strncmp (tokstart + 1, std_regs[c].name, namelen - 1))
1341        {
1342          yylval.lval = std_regs[c].regnum;
1343          return REGNAME;
1344        }
1345   }
1346   /* Catch specific keywords.  Should be done with a data structure.  */
1347   switch (namelen)
1348     {
1349     case 8:
1350       if (!strncmp (tokstart, "unsigned", 8))
1351         return UNSIGNED;
1352       if (current_language->la_language == language_cplus
1353           && !strncmp (tokstart, "template", 8))
1354         return TEMPLATE;
1355       if (!strncmp (tokstart, "volatile", 8))
1356         return VOLATILE_KEYWORD;
1357       break;
1358     case 6:
1359       if (!strncmp (tokstart, "struct", 6))
1360         return STRUCT;
1361       if (!strncmp (tokstart, "signed", 6))
1362         return SIGNED_KEYWORD;
1363       if (!strncmp (tokstart, "sizeof", 6))
1364         return SIZEOF;
1365       break;
1366     case 5:
1367       if (current_language->la_language == language_cplus
1368           && !strncmp (tokstart, "class", 5))
1369         return CLASS;
1370       if (!strncmp (tokstart, "union", 5))
1371         return UNION;
1372       if (!strncmp (tokstart, "short", 5))
1373         return SHORT;
1374       if (!strncmp (tokstart, "const", 5))
1375         return CONST_KEYWORD;
1376       break;
1377     case 4:
1378       if (!strncmp (tokstart, "enum", 4))
1379         return ENUM;
1380       if (!strncmp (tokstart, "long", 4))
1381         return LONG;
1382       if (current_language->la_language == language_cplus
1383           && !strncmp (tokstart, "this", 4))
1384         {
1385           static const char this_name[] =
1386                                  { CPLUS_MARKER, 't', 'h', 'i', 's', '\0' };
1387
1388           if (lookup_symbol (this_name, expression_context_block,
1389                              VAR_NAMESPACE, 0, NULL))
1390             return THIS;
1391         }
1392       break;
1393     case 3:
1394       if (!strncmp (tokstart, "int", 3))
1395         return INT_KEYWORD;
1396       break;
1397     default:
1398       break;
1399     }
1400
1401   yylval.sval.ptr = tokstart;
1402   yylval.sval.length = namelen;
1403
1404   /* Any other names starting in $ are debugger internal variables.  */
1405
1406   if (*tokstart == '$')
1407     {
1408       yylval.ivar =  lookup_internalvar (copy_name (yylval.sval) + 1);
1409       return VARIABLE;
1410     }
1411
1412   /* Use token-type BLOCKNAME for symbols that happen to be defined as
1413      functions or symtabs.  If this is not so, then ...
1414      Use token-type TYPENAME for symbols that happen to be defined
1415      currently as names of types; NAME for other symbols.
1416      The caller is not constrained to care about the distinction.  */
1417   {
1418     char *tmp = copy_name (yylval.sval);
1419     struct symbol *sym;
1420     int is_a_field_of_this = 0;
1421     int hextype;
1422
1423     sym = lookup_symbol (tmp, expression_context_block,
1424                          VAR_NAMESPACE,
1425                          current_language->la_language == language_cplus
1426                          ? &is_a_field_of_this : NULL,
1427                          NULL);
1428     if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK) ||
1429         lookup_partial_symtab (tmp))
1430       {
1431         yylval.ssym.sym = sym;
1432         yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1433         return BLOCKNAME;
1434       }
1435     if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1436         {
1437           yylval.tsym.type = SYMBOL_TYPE (sym);
1438           return TYPENAME;
1439         }
1440     if ((yylval.tsym.type = lookup_primitive_typename (tmp)) != 0)
1441         return TYPENAME;
1442
1443     /* Input names that aren't symbols but ARE valid hex numbers,
1444        when the input radix permits them, can be names or numbers
1445        depending on the parse.  Note we support radixes > 16 here.  */
1446     if (!sym &&
1447         ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1448          (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1449       {
1450         YYSTYPE newlval;        /* Its value is ignored.  */
1451         hextype = parse_number (tokstart, namelen, 0, &newlval);
1452         if (hextype == INT)
1453           {
1454             yylval.ssym.sym = sym;
1455             yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1456             return NAME_OR_INT;
1457           }
1458       }
1459
1460     /* Any other kind of symbol */
1461     yylval.ssym.sym = sym;
1462     yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1463     return NAME;
1464   }
1465 }
1466
1467 void
1468 yyerror (msg)
1469      char *msg;
1470 {
1471   error (msg ? msg : "Invalid syntax in expression.");
1472 }
1473 \f
1474 /* Table mapping opcodes into strings for printing operators
1475    and precedences of the operators.  */
1476
1477 const static struct op_print c_op_print_tab[] =
1478   {
1479     {",",  BINOP_COMMA, PREC_COMMA, 0},
1480     {"=",  BINOP_ASSIGN, PREC_ASSIGN, 1},
1481     {"||", BINOP_OR, PREC_OR, 0},
1482     {"&&", BINOP_AND, PREC_AND, 0},
1483     {"|",  BINOP_LOGIOR, PREC_LOGIOR, 0},
1484     {"&",  BINOP_LOGAND, PREC_LOGAND, 0},
1485     {"^",  BINOP_LOGXOR, PREC_LOGXOR, 0},
1486     {"==", BINOP_EQUAL, PREC_EQUAL, 0},
1487     {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0},
1488     {"<=", BINOP_LEQ, PREC_ORDER, 0},
1489     {">=", BINOP_GEQ, PREC_ORDER, 0},
1490     {">",  BINOP_GTR, PREC_ORDER, 0},
1491     {"<",  BINOP_LESS, PREC_ORDER, 0},
1492     {">>", BINOP_RSH, PREC_SHIFT, 0},
1493     {"<<", BINOP_LSH, PREC_SHIFT, 0},
1494     {"+",  BINOP_ADD, PREC_ADD, 0},
1495     {"-",  BINOP_SUB, PREC_ADD, 0},
1496     {"*",  BINOP_MUL, PREC_MUL, 0},
1497     {"/",  BINOP_DIV, PREC_MUL, 0},
1498     {"%",  BINOP_REM, PREC_MUL, 0},
1499     {"@",  BINOP_REPEAT, PREC_REPEAT, 0},
1500     {"-",  UNOP_NEG, PREC_PREFIX, 0},
1501     {"!",  UNOP_ZEROP, PREC_PREFIX, 0},
1502     {"~",  UNOP_LOGNOT, PREC_PREFIX, 0},
1503     {"*",  UNOP_IND, PREC_PREFIX, 0},
1504     {"&",  UNOP_ADDR, PREC_PREFIX, 0},
1505     {"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0},
1506     {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0},
1507     {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0},
1508     /* C++  */
1509     {"::", BINOP_SCOPE, PREC_PREFIX, 0},
1510 };
1511 \f
1512 /* These variables point to the objects
1513    representing the predefined C data types.  */
1514
1515 struct type *builtin_type_void;
1516 struct type *builtin_type_char;
1517 struct type *builtin_type_short;
1518 struct type *builtin_type_int;
1519 struct type *builtin_type_long;
1520 struct type *builtin_type_long_long;
1521 struct type *builtin_type_signed_char;
1522 struct type *builtin_type_unsigned_char;
1523 struct type *builtin_type_unsigned_short;
1524 struct type *builtin_type_unsigned_int;
1525 struct type *builtin_type_unsigned_long;
1526 struct type *builtin_type_unsigned_long_long;
1527 struct type *builtin_type_float;
1528 struct type *builtin_type_double;
1529 struct type *builtin_type_long_double;
1530 struct type *builtin_type_complex;
1531 struct type *builtin_type_double_complex;
1532
1533 struct type ** const (c_builtin_types[]) =
1534 {
1535   &builtin_type_int,
1536   &builtin_type_long,
1537   &builtin_type_short,
1538   &builtin_type_char,
1539   &builtin_type_float,
1540   &builtin_type_double,
1541   &builtin_type_void,
1542   &builtin_type_long_long,
1543   &builtin_type_signed_char,
1544   &builtin_type_unsigned_char,
1545   &builtin_type_unsigned_short,
1546   &builtin_type_unsigned_int,
1547   &builtin_type_unsigned_long,
1548   &builtin_type_unsigned_long_long,
1549   &builtin_type_long_double,
1550   &builtin_type_complex,
1551   &builtin_type_double_complex,
1552   0
1553 };
1554
1555 const struct language_defn c_language_defn = {
1556   "c",                          /* Language name */
1557   language_c,
1558   c_builtin_types,
1559   range_check_off,
1560   type_check_off,
1561   c_parse,
1562   c_error,
1563   &BUILTIN_TYPE_LONGEST,         /* longest signed   integral type */
1564   &BUILTIN_TYPE_UNSIGNED_LONGEST,/* longest unsigned integral type */
1565   &builtin_type_double,         /* longest floating point type */ /*FIXME*/
1566   "0x%x", "0x%", "x",           /* Hex   format, prefix, suffix */
1567   "0%o",  "0%",  "o",           /* Octal format, prefix, suffix */
1568   c_op_print_tab,               /* expression operators for printing */
1569   LANG_MAGIC
1570 };
1571
1572 const struct language_defn cplus_language_defn = {
1573   "c++",                                /* Language name */
1574   language_cplus,
1575   c_builtin_types,
1576   range_check_off,
1577   type_check_off,
1578   c_parse,
1579   c_error,
1580   &BUILTIN_TYPE_LONGEST,         /* longest signed   integral type */
1581   &BUILTIN_TYPE_UNSIGNED_LONGEST,/* longest unsigned integral type */
1582   &builtin_type_double,         /* longest floating point type */ /*FIXME*/
1583   "0x%x", "0x%", "x",           /* Hex   format, prefix, suffix */
1584   "0%o",  "0%",  "o",           /* Octal format, prefix, suffix */
1585   c_op_print_tab,               /* expression operators for printing */
1586   LANG_MAGIC
1587 };
1588
1589 void
1590 _initialize_c_exp ()
1591 {
1592   builtin_type_void =
1593     init_type (TYPE_CODE_VOID, 1,
1594                0,
1595                "void", (struct objfile *) NULL);
1596   builtin_type_char =
1597     init_type (TYPE_CODE_INT, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
1598                0,
1599                "char", (struct objfile *) NULL);
1600   builtin_type_signed_char =
1601     init_type (TYPE_CODE_INT, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
1602                TYPE_FLAG_SIGNED,
1603                "signed char", (struct objfile *) NULL);
1604   builtin_type_unsigned_char =
1605     init_type (TYPE_CODE_INT, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
1606                TYPE_FLAG_UNSIGNED,
1607                "unsigned char", (struct objfile *) NULL);
1608   builtin_type_short =
1609     init_type (TYPE_CODE_INT, TARGET_SHORT_BIT / TARGET_CHAR_BIT,
1610                0,
1611                "short", (struct objfile *) NULL);
1612   builtin_type_unsigned_short =
1613     init_type (TYPE_CODE_INT, TARGET_SHORT_BIT / TARGET_CHAR_BIT,
1614                TYPE_FLAG_UNSIGNED,
1615                "unsigned short", (struct objfile *) NULL);
1616   builtin_type_int =
1617     init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT,
1618                0,
1619                "int", (struct objfile *) NULL);
1620   builtin_type_unsigned_int =
1621     init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT,
1622                TYPE_FLAG_UNSIGNED,
1623                "unsigned int", (struct objfile *) NULL);
1624   builtin_type_long =
1625     init_type (TYPE_CODE_INT, TARGET_LONG_BIT / TARGET_CHAR_BIT,
1626                0,
1627                "long", (struct objfile *) NULL);
1628   builtin_type_unsigned_long =
1629     init_type (TYPE_CODE_INT, TARGET_LONG_BIT / TARGET_CHAR_BIT,
1630                TYPE_FLAG_UNSIGNED,
1631                "unsigned long", (struct objfile *) NULL);
1632   builtin_type_long_long =
1633     init_type (TYPE_CODE_INT, TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
1634                0,
1635                "long long", (struct objfile *) NULL);
1636   builtin_type_unsigned_long_long =
1637     init_type (TYPE_CODE_INT, TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
1638                TYPE_FLAG_UNSIGNED,
1639                "unsigned long long", (struct objfile *) NULL);
1640   builtin_type_float =
1641     init_type (TYPE_CODE_FLT, TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
1642                0,
1643                "float", (struct objfile *) NULL);
1644   builtin_type_double =
1645     init_type (TYPE_CODE_FLT, TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
1646                0,
1647                "double", (struct objfile *) NULL);
1648   builtin_type_long_double =
1649     init_type (TYPE_CODE_FLT, TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
1650                0,
1651                "long double", (struct objfile *) NULL);
1652   builtin_type_complex =
1653     init_type (TYPE_CODE_FLT, TARGET_COMPLEX_BIT / TARGET_CHAR_BIT,
1654                0,
1655                "complex", (struct objfile *) NULL);
1656   builtin_type_double_complex =
1657     init_type (TYPE_CODE_FLT, TARGET_DOUBLE_COMPLEX_BIT / TARGET_CHAR_BIT,
1658                0,
1659                "double complex", (struct objfile *) NULL);
1660
1661   add_language (&c_language_defn);
1662   add_language (&cplus_language_defn);
1663 }