gdb/p-exp.y

   1 /* YACC parser for Pascal expressions, for GDB.
   2    Copyright (C) 2000, 2006
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GDB.
   6
   7 This program 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 of the License, or
  10 (at your option) any later version.
  11
  12 This program 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 this program; if not, write to the Free Software
  19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, USA.  */
  21
  22 /* This file is derived from c-exp.y */
  23
  24 /* Parse a Pascal expression from text in a string,
  25    and return the result as a  struct expression  pointer.
  26    That structure contains arithmetic operations in reverse polish,
  27    with constants represented by operations that are followed by special data.
  28    See expression.h for the details of the format.
  29    What is important here is that it can be built up sequentially
  30    during the process of parsing; the lower levels of the tree always
  31    come first in the result.
  32
  33    Note that malloc's and realloc's in this file are transformed to
  34    xmalloc and xrealloc respectively by the same sed command in the
  35    makefile that remaps any other malloc/realloc inserted by the parser
  36    generator.  Doing this with #defines and trying to control the interaction
  37    with include files (<malloc.h> and <stdlib.h> for example) just became
  38    too messy, particularly when such includes can be inserted at random
  39    times by the parser generator.  */
  40
  41 /* Known bugs or limitations:
  42     - pascal string operations are not supported at all.
  43     - there are some problems with boolean types.
  44     - Pascal type hexadecimal constants are not supported
  45       because they conflict with the internal variables format.
  46    Probably also lots of other problems, less well defined PM */
  47 %{
  48
  49 #include "defs.h"
  50 #include "gdb_string.h"
  51 #include <ctype.h>
  52 #include "expression.h"
  53 #include "value.h"
  54 #include "parser-defs.h"
  55 #include "language.h"
  56 #include "p-lang.h"
  57 #include "bfd.h" /* Required by objfiles.h.  */
  58 #include "symfile.h" /* Required by objfiles.h.  */
  59 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
  60 #include "block.h"
  61
  62 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
  63    as well as gratuitiously global symbol names, so we can have multiple
  64    yacc generated parsers in gdb.  Note that these are only the variables
  65    produced by yacc.  If other parser generators (bison, byacc, etc) produce
  66    additional global names that conflict at link time, then those parser
  67    generators need to be fixed instead of adding those names to this list. */
  68
  69 #define yymaxdepth pascal_maxdepth
  70 #define yyparse pascal_parse
  71 #define yylex   pascal_lex
  72 #define yyerror pascal_error
  73 #define yylval  pascal_lval
  74 #define yychar  pascal_char
  75 #define yydebug pascal_debug
  76 #define yypact  pascal_pact
  77 #define yyr1    pascal_r1
  78 #define yyr2    pascal_r2
  79 #define yydef   pascal_def
  80 #define yychk   pascal_chk
  81 #define yypgo   pascal_pgo
  82 #define yyact   pascal_act
  83 #define yyexca  pascal_exca
  84 #define yyerrflag pascal_errflag
  85 #define yynerrs pascal_nerrs
  86 #define yyps    pascal_ps
  87 #define yypv    pascal_pv
  88 #define yys     pascal_s
  89 #define yy_yys  pascal_yys
  90 #define yystate pascal_state
  91 #define yytmp   pascal_tmp
  92 #define yyv     pascal_v
  93 #define yy_yyv  pascal_yyv
  94 #define yyval   pascal_val
  95 #define yylloc  pascal_lloc
  96 #define yyreds  pascal_reds             /* With YYDEBUG defined */
  97 #define yytoks  pascal_toks             /* With YYDEBUG defined */
  98 #define yyname  pascal_name             /* With YYDEBUG defined */
  99 #define yyrule  pascal_rule             /* With YYDEBUG defined */
 100 #define yylhs   pascal_yylhs
 101 #define yylen   pascal_yylen
 102 #define yydefred pascal_yydefred
 103 #define yydgoto pascal_yydgoto
 104 #define yysindex pascal_yysindex
 105 #define yyrindex pascal_yyrindex
 106 #define yygindex pascal_yygindex
 107 #define yytable  pascal_yytable
 108 #define yycheck  pascal_yycheck
 109
 110 #ifndef YYDEBUG
 111 #define YYDEBUG 1               /* Default to yydebug support */
 112 #endif
 113
 114 #define YYFPRINTF parser_fprintf
 115
 116 int yyparse (void);
 117
 118 static int yylex (void);
 119
 120 void
 121 yyerror (char *);
 122
 123 static char * uptok (char *, int);
 124 %}
 125
 126 /* Although the yacc "value" of an expression is not used,
 127    since the result is stored in the structure being created,
 128    other node types do have values.  */
 129
 130 %union
 131   {
 132     LONGEST lval;
 133     struct {
 134       LONGEST val;
 135       struct type *type;
 136     } typed_val_int;
 137     struct {
 138       DOUBLEST dval;
 139       struct type *type;
 140     } typed_val_float;
 141     struct symbol *sym;
 142     struct type *tval;
 143     struct stoken sval;
 144     struct ttype tsym;
 145     struct symtoken ssym;
 146     int voidval;
 147     struct block *bval;
 148     enum exp_opcode opcode;
 149     struct internalvar *ivar;
 150
 151     struct type **tvec;
 152     int *ivec;
 153   }
 154
 155 %{
 156 /* YYSTYPE gets defined by %union */
 157 static int
 158 parse_number (char *, int, int, YYSTYPE *);
 159
 160 static struct type *current_type;
 161
 162 static void push_current_type (void);
 163 static void pop_current_type (void);
 164 static int search_field;
 165 %}
 166
 167 %type <voidval> exp exp1 type_exp start normal_start variable qualified_name
 168 %type <tval> type typebase
 169 /* %type <bval> block */
 170
 171 /* Fancy type parsing.  */
 172 %type <tval> ptype
 173
 174 %token <typed_val_int> INT
 175 %token <typed_val_float> FLOAT
 176
 177 /* Both NAME and TYPENAME tokens represent symbols in the input,
 178    and both convey their data as strings.
 179    But a TYPENAME is a string that happens to be defined as a typedef
 180    or builtin type name (such as int or char)
 181    and a NAME is any other symbol.
 182    Contexts where this distinction is not important can use the
 183    nonterminal "name", which matches either NAME or TYPENAME.  */
 184
 185 %token <sval> STRING
 186 %token <sval> FIELDNAME
 187 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
 188 %token <tsym> TYPENAME
 189 %type <sval> name
 190 %type <ssym> name_not_typename
 191
 192 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
 193    but which would parse as a valid number in the current input radix.
 194    E.g. "c" when input_radix==16.  Depending on the parse, it will be
 195    turned into a name or into a number.  */
 196
 197 %token <ssym> NAME_OR_INT
 198
 199 %token STRUCT CLASS SIZEOF COLONCOLON
 200 %token ERROR
 201
 202 /* Special type cases, put in to allow the parser to distinguish different
 203    legal basetypes.  */
 204
 205 %token <voidval> VARIABLE
 206
 207
 208 /* Object pascal */
 209 %token THIS
 210 %token <lval> TRUEKEYWORD FALSEKEYWORD
 211
 212 %left ','
 213 %left ABOVE_COMMA
 214 %right ASSIGN
 215 %left NOT
 216 %left OR
 217 %left XOR
 218 %left ANDAND
 219 %left '=' NOTEQUAL
 220 %left '<' '>' LEQ GEQ
 221 %left LSH RSH DIV MOD
 222 %left '@'
 223 %left '+' '-'
 224 %left '*' '/'
 225 %right UNARY INCREMENT DECREMENT
 226 %right ARROW '.' '[' '('
 227 %left '^'
 228 %token <ssym> BLOCKNAME
 229 %type <bval> block
 230 %left COLONCOLON
 231
 232 \f
 233 %%
 234
 235 start   :       { current_type = NULL;
 236                   search_field = 0;
 237                 }
 238                 normal_start {}
 239         ;
 240
 241 normal_start    :
 242                 exp1
 243         |       type_exp
 244         ;
 245
 246 type_exp:       type
 247                         { write_exp_elt_opcode(OP_TYPE);
 248                           write_exp_elt_type($1);
 249                           write_exp_elt_opcode(OP_TYPE);
 250                           current_type = $1; } ;
 251
 252 /* Expressions, including the comma operator.  */
 253 exp1    :       exp
 254         |       exp1 ',' exp
 255                         { write_exp_elt_opcode (BINOP_COMMA); }
 256         ;
 257
 258 /* Expressions, not including the comma operator.  */
 259 exp     :       exp '^'   %prec UNARY
 260                         { write_exp_elt_opcode (UNOP_IND);
 261                           if (current_type)
 262                             current_type = TYPE_TARGET_TYPE (current_type); }
 263         ;
 264
 265 exp     :       '@' exp    %prec UNARY
 266                         { write_exp_elt_opcode (UNOP_ADDR);
 267                           if (current_type)
 268                             current_type = TYPE_POINTER_TYPE (current_type); }
 269         ;
 270
 271 exp     :       '-' exp    %prec UNARY
 272                         { write_exp_elt_opcode (UNOP_NEG); }
 273         ;
 274
 275 exp     :       NOT exp    %prec UNARY
 276                         { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
 277         ;
 278
 279 exp     :       INCREMENT '(' exp ')'   %prec UNARY
 280                         { write_exp_elt_opcode (UNOP_PREINCREMENT); }
 281         ;
 282
 283 exp     :       DECREMENT  '(' exp ')'   %prec UNARY
 284                         { write_exp_elt_opcode (UNOP_PREDECREMENT); }
 285         ;
 286
 287 exp     :       exp '.' { search_field = 1; }
 288                 FIELDNAME
 289                 /* name */
 290                         { write_exp_elt_opcode (STRUCTOP_STRUCT);
 291                           write_exp_string ($4);
 292                           write_exp_elt_opcode (STRUCTOP_STRUCT);
 293                           search_field = 0;
 294                           if (current_type)
 295                             { while (TYPE_CODE (current_type) == TYPE_CODE_PTR)
 296                                 current_type = TYPE_TARGET_TYPE (current_type);
 297                               current_type = lookup_struct_elt_type (
 298                                 current_type, $4.ptr, 0); };
 299                          } ;
 300 exp     :       exp '['
 301                         /* We need to save the current_type value */
 302                         { char *arrayname;
 303                           int arrayfieldindex;
 304                           arrayfieldindex = is_pascal_string_type (
 305                                 current_type, NULL, NULL,
 306                                 NULL, NULL, &arrayname);
 307                           if (arrayfieldindex)
 308                             {
 309                               struct stoken stringsval;
 310                               stringsval.ptr = alloca (strlen (arrayname) + 1);
 311                               stringsval.length = strlen (arrayname);
 312                               strcpy (stringsval.ptr, arrayname);
 313                               current_type = TYPE_FIELD_TYPE (current_type,
 314                                 arrayfieldindex - 1);
 315                               write_exp_elt_opcode (STRUCTOP_STRUCT);
 316                               write_exp_string (stringsval);
 317                               write_exp_elt_opcode (STRUCTOP_STRUCT);
 318                             }
 319                           push_current_type ();  }
 320                 exp1 ']'
 321                         { pop_current_type ();
 322                           write_exp_elt_opcode (BINOP_SUBSCRIPT);
 323                           if (current_type)
 324                             current_type = TYPE_TARGET_TYPE (current_type); }
 325         ;
 326
 327 exp     :       exp '('
 328                         /* This is to save the value of arglist_len
 329                            being accumulated by an outer function call.  */
 330                         { push_current_type ();
 331                           start_arglist (); }
 332                 arglist ')'     %prec ARROW
 333                         { write_exp_elt_opcode (OP_FUNCALL);
 334                           write_exp_elt_longcst ((LONGEST) end_arglist ());
 335                           write_exp_elt_opcode (OP_FUNCALL);
 336                           pop_current_type (); }
 337         ;
 338
 339 arglist :
 340          | exp
 341                         { arglist_len = 1; }
 342          | arglist ',' exp   %prec ABOVE_COMMA
 343                         { arglist_len++; }
 344         ;
 345
 346 exp     :       type '(' exp ')' %prec UNARY
 347                         { if (current_type)
 348                             {
 349                               /* Allow automatic dereference of classes.  */
 350                               if ((TYPE_CODE (current_type) == TYPE_CODE_PTR)
 351                                   && (TYPE_CODE (TYPE_TARGET_TYPE (current_type)) == TYPE_CODE_CLASS)
 352                                   && (TYPE_CODE ($1) == TYPE_CODE_CLASS))
 353                                 write_exp_elt_opcode (UNOP_IND);
 354                             }
 355                           write_exp_elt_opcode (UNOP_CAST);
 356                           write_exp_elt_type ($1);
 357                           write_exp_elt_opcode (UNOP_CAST);
 358                           current_type = $1; }
 359         ;
 360
 361 exp     :       '(' exp1 ')'
 362                         { }
 363         ;
 364
 365 /* Binary operators in order of decreasing precedence.  */
 366
 367 exp     :       exp '*' exp
 368                         { write_exp_elt_opcode (BINOP_MUL); }
 369         ;
 370
 371 exp     :       exp '/' exp
 372                         { write_exp_elt_opcode (BINOP_DIV); }
 373         ;
 374
 375 exp     :       exp DIV exp
 376                         { write_exp_elt_opcode (BINOP_INTDIV); }
 377         ;
 378
 379 exp     :       exp MOD exp
 380                         { write_exp_elt_opcode (BINOP_REM); }
 381         ;
 382
 383 exp     :       exp '+' exp
 384                         { write_exp_elt_opcode (BINOP_ADD); }
 385         ;
 386
 387 exp     :       exp '-' exp
 388                         { write_exp_elt_opcode (BINOP_SUB); }
 389         ;
 390
 391 exp     :       exp LSH exp
 392                         { write_exp_elt_opcode (BINOP_LSH); }
 393         ;
 394
 395 exp     :       exp RSH exp
 396                         { write_exp_elt_opcode (BINOP_RSH); }
 397         ;
 398
 399 exp     :       exp '=' exp
 400                         { write_exp_elt_opcode (BINOP_EQUAL); }
 401         ;
 402
 403 exp     :       exp NOTEQUAL exp
 404                         { write_exp_elt_opcode (BINOP_NOTEQUAL); }
 405         ;
 406
 407 exp     :       exp LEQ exp
 408                         { write_exp_elt_opcode (BINOP_LEQ); }
 409         ;
 410
 411 exp     :       exp GEQ exp
 412                         { write_exp_elt_opcode (BINOP_GEQ); }
 413         ;
 414
 415 exp     :       exp '<' exp
 416                         { write_exp_elt_opcode (BINOP_LESS); }
 417         ;
 418
 419 exp     :       exp '>' exp
 420                         { write_exp_elt_opcode (BINOP_GTR); }
 421         ;
 422
 423 exp     :       exp ANDAND exp
 424                         { write_exp_elt_opcode (BINOP_BITWISE_AND); }
 425         ;
 426
 427 exp     :       exp XOR exp
 428                         { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
 429         ;
 430
 431 exp     :       exp OR exp
 432                         { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
 433         ;
 434
 435 exp     :       exp ASSIGN exp
 436                         { write_exp_elt_opcode (BINOP_ASSIGN); }
 437         ;
 438
 439 exp     :       TRUEKEYWORD
 440                         { write_exp_elt_opcode (OP_BOOL);
 441                           write_exp_elt_longcst ((LONGEST) $1);
 442                           write_exp_elt_opcode (OP_BOOL); }
 443         ;
 444
 445 exp     :       FALSEKEYWORD
 446                         { write_exp_elt_opcode (OP_BOOL);
 447                           write_exp_elt_longcst ((LONGEST) $1);
 448                           write_exp_elt_opcode (OP_BOOL); }
 449         ;
 450
 451 exp     :       INT
 452                         { write_exp_elt_opcode (OP_LONG);
 453                           write_exp_elt_type ($1.type);
 454                           write_exp_elt_longcst ((LONGEST)($1.val));
 455                           write_exp_elt_opcode (OP_LONG); }
 456         ;
 457
 458 exp     :       NAME_OR_INT
 459                         { YYSTYPE val;
 460                           parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
 461                           write_exp_elt_opcode (OP_LONG);
 462                           write_exp_elt_type (val.typed_val_int.type);
 463                           write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
 464                           write_exp_elt_opcode (OP_LONG);
 465                         }
 466         ;
 467
 468
 469 exp     :       FLOAT
 470                         { write_exp_elt_opcode (OP_DOUBLE);
 471                           write_exp_elt_type ($1.type);
 472                           write_exp_elt_dblcst ($1.dval);
 473                           write_exp_elt_opcode (OP_DOUBLE); }
 474         ;
 475
 476 exp     :       variable
 477         ;
 478
 479 exp     :       VARIABLE
 480                         /* Already written by write_dollar_variable. */
 481         ;
 482
 483 exp     :       SIZEOF '(' type ')'     %prec UNARY
 484                         { write_exp_elt_opcode (OP_LONG);
 485                           write_exp_elt_type (builtin_type_int);
 486                           CHECK_TYPEDEF ($3);
 487                           write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
 488                           write_exp_elt_opcode (OP_LONG); }
 489         ;
 490
 491 exp     :       STRING
 492                         { /* C strings are converted into array constants with
 493                              an explicit null byte added at the end.  Thus
 494                              the array upper bound is the string length.
 495                              There is no such thing in C as a completely empty
 496                              string. */
 497                           char *sp = $1.ptr; int count = $1.length;
 498                           while (count-- > 0)
 499                             {
 500                               write_exp_elt_opcode (OP_LONG);
 501                               write_exp_elt_type (builtin_type_char);
 502                               write_exp_elt_longcst ((LONGEST)(*sp++));
 503                               write_exp_elt_opcode (OP_LONG);
 504                             }
 505                           write_exp_elt_opcode (OP_LONG);
 506                           write_exp_elt_type (builtin_type_char);
 507                           write_exp_elt_longcst ((LONGEST)'\0');
 508                           write_exp_elt_opcode (OP_LONG);
 509                           write_exp_elt_opcode (OP_ARRAY);
 510                           write_exp_elt_longcst ((LONGEST) 0);
 511                           write_exp_elt_longcst ((LONGEST) ($1.length));
 512                           write_exp_elt_opcode (OP_ARRAY); }
 513         ;
 514
 515 /* Object pascal  */
 516 exp     :       THIS
 517                         {
 518                           struct value * this_val;
 519                           struct type * this_type;
 520                           write_exp_elt_opcode (OP_THIS);
 521                           write_exp_elt_opcode (OP_THIS);
 522                           /* we need type of this */
 523                           this_val = value_of_this (0);
 524                           if (this_val)
 525                             this_type = value_type (this_val);
 526                           else
 527                             this_type = NULL;
 528                           if (this_type)
 529                             {
 530                               if (TYPE_CODE (this_type) == TYPE_CODE_PTR)
 531                                 {
 532                                   this_type = TYPE_TARGET_TYPE (this_type);
 533                                   write_exp_elt_opcode (UNOP_IND);
 534                                 }
 535                             }
 536
 537                           current_type = this_type;
 538                         }
 539         ;
 540
 541 /* end of object pascal.  */
 542
 543 block   :       BLOCKNAME
 544                         {
 545                           if ($1.sym != 0)
 546                               $$ = SYMBOL_BLOCK_VALUE ($1.sym);
 547                           else
 548                             {
 549                               struct symtab *tem =
 550                                   lookup_symtab (copy_name ($1.stoken));
 551                               if (tem)
 552                                 $$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem), STATIC_BLOCK);
 553                               else
 554                                 error ("No file or function \"%s\".",
 555                                        copy_name ($1.stoken));
 556                             }
 557                         }
 558         ;
 559
 560 block   :       block COLONCOLON name
 561                         { struct symbol *tem
 562                             = lookup_symbol (copy_name ($3), $1,
 563                                              VAR_DOMAIN, (int *) NULL,
 564                                              (struct symtab **) NULL);
 565                           if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
 566                             error ("No function \"%s\" in specified context.",
 567                                    copy_name ($3));
 568                           $$ = SYMBOL_BLOCK_VALUE (tem); }
 569         ;
 570
 571 variable:       block COLONCOLON name
 572                         { struct symbol *sym;
 573                           sym = lookup_symbol (copy_name ($3), $1,
 574                                                VAR_DOMAIN, (int *) NULL,
 575                                                (struct symtab **) NULL);
 576                           if (sym == 0)
 577                             error ("No symbol \"%s\" in specified context.",
 578                                    copy_name ($3));
 579
 580                           write_exp_elt_opcode (OP_VAR_VALUE);
 581                           /* block_found is set by lookup_symbol.  */
 582                           write_exp_elt_block (block_found);
 583                           write_exp_elt_sym (sym);
 584                           write_exp_elt_opcode (OP_VAR_VALUE); }
 585         ;
 586
 587 qualified_name: typebase COLONCOLON name
 588                         {
 589                           struct type *type = $1;
 590                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 591                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 592                             error ("`%s' is not defined as an aggregate type.",
 593                                    TYPE_NAME (type));
 594
 595                           write_exp_elt_opcode (OP_SCOPE);
 596                           write_exp_elt_type (type);
 597                           write_exp_string ($3);
 598                           write_exp_elt_opcode (OP_SCOPE);
 599                         }
 600         ;
 601
 602 variable:       qualified_name
 603         |       COLONCOLON name
 604                         {
 605                           char *name = copy_name ($2);
 606                           struct symbol *sym;
 607                           struct minimal_symbol *msymbol;
 608
 609                           sym =
 610                             lookup_symbol (name, (const struct block *) NULL,
 611                                            VAR_DOMAIN, (int *) NULL,
 612                                            (struct symtab **) NULL);
 613                           if (sym)
 614                             {
 615                               write_exp_elt_opcode (OP_VAR_VALUE);
 616                               write_exp_elt_block (NULL);
 617                               write_exp_elt_sym (sym);
 618                               write_exp_elt_opcode (OP_VAR_VALUE);
 619                               break;
 620                             }
 621
 622                           msymbol = lookup_minimal_symbol (name, NULL, NULL);
 623                           if (msymbol != NULL)
 624                             {
 625                               write_exp_msymbol (msymbol,
 626                                                  lookup_function_type (builtin_type_int),
 627                                                  builtin_type_int);
 628                             }
 629                           else
 630                             if (!have_full_symbols () && !have_partial_symbols ())
 631                               error ("No symbol table is loaded.  Use the \"file\" command.");
 632                             else
 633                               error ("No symbol \"%s\" in current context.", name);
 634                         }
 635         ;
 636
 637 variable:       name_not_typename
 638                         { struct symbol *sym = $1.sym;
 639
 640                           if (sym)
 641                             {
 642                               if (symbol_read_needs_frame (sym))
 643                                 {
 644                                   if (innermost_block == 0 ||
 645                                       contained_in (block_found,
 646                                                     innermost_block))
 647                                     innermost_block = block_found;
 648                                 }
 649
 650                               write_exp_elt_opcode (OP_VAR_VALUE);
 651                               /* We want to use the selected frame, not
 652                                  another more inner frame which happens to
 653                                  be in the same block.  */
 654                               write_exp_elt_block (NULL);
 655                               write_exp_elt_sym (sym);
 656                               write_exp_elt_opcode (OP_VAR_VALUE);
 657                               current_type = sym->type; }
 658                           else if ($1.is_a_field_of_this)
 659                             {
 660                               struct value * this_val;
 661                               struct type * this_type;
 662                               /* Object pascal: it hangs off of `this'.  Must
 663                                  not inadvertently convert from a method call
 664                                  to data ref.  */
 665                               if (innermost_block == 0 ||
 666                                   contained_in (block_found, innermost_block))
 667                                 innermost_block = block_found;
 668                               write_exp_elt_opcode (OP_THIS);
 669                               write_exp_elt_opcode (OP_THIS);
 670                               write_exp_elt_opcode (STRUCTOP_PTR);
 671                               write_exp_string ($1.stoken);
 672                               write_exp_elt_opcode (STRUCTOP_PTR);
 673                               /* we need type of this */
 674                               this_val = value_of_this (0);
 675                               if (this_val)
 676                                 this_type = value_type (this_val);
 677                               else
 678                                 this_type = NULL;
 679                               if (this_type)
 680                                 current_type = lookup_struct_elt_type (
 681                                   this_type,
 682                                   copy_name ($1.stoken), 0);
 683                               else
 684                                 current_type = NULL;
 685                             }
 686                           else
 687                             {
 688                               struct minimal_symbol *msymbol;
 689                               char *arg = copy_name ($1.stoken);
 690
 691                               msymbol =
 692                                 lookup_minimal_symbol (arg, NULL, NULL);
 693                               if (msymbol != NULL)
 694                                 {
 695                                   write_exp_msymbol (msymbol,
 696                                                      lookup_function_type (builtin_type_int),
 697                                                      builtin_type_int);
 698                                 }
 699                               else if (!have_full_symbols () && !have_partial_symbols ())
 700                                 error ("No symbol table is loaded.  Use the \"file\" command.");
 701                               else
 702                                 error ("No symbol \"%s\" in current context.",
 703                                        copy_name ($1.stoken));
 704                             }
 705                         }
 706         ;
 707
 708
 709 ptype   :       typebase
 710         ;
 711
 712 /* We used to try to recognize more pointer to member types here, but
 713    that didn't work (shift/reduce conflicts meant that these rules never
 714    got executed).  The problem is that
 715      int (foo::bar::baz::bizzle)
 716    is a function type but
 717      int (foo::bar::baz::bizzle::*)
 718    is a pointer to member type.  Stroustrup loses again!  */
 719
 720 type    :       ptype
 721         ;
 722
 723 typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 724         :       '^' typebase
 725                         { $$ = lookup_pointer_type ($2); }
 726         |       TYPENAME
 727                         { $$ = $1.type; }
 728         |       STRUCT name
 729                         { $$ = lookup_struct (copy_name ($2),
 730                                               expression_context_block); }
 731         |       CLASS name
 732                         { $$ = lookup_struct (copy_name ($2),
 733                                               expression_context_block); }
 734         /* "const" and "volatile" are curently ignored.  A type qualifier
 735            after the type is handled in the ptype rule.  I think these could
 736            be too.  */
 737         ;
 738
 739 name    :       NAME { $$ = $1.stoken; }
 740         |       BLOCKNAME { $$ = $1.stoken; }
 741         |       TYPENAME { $$ = $1.stoken; }
 742         |       NAME_OR_INT  { $$ = $1.stoken; }
 743         ;
 744
 745 name_not_typename :     NAME
 746         |       BLOCKNAME
 747 /* These would be useful if name_not_typename was useful, but it is just
 748    a fake for "variable", so these cause reduce/reduce conflicts because
 749    the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
 750    =exp) or just an exp.  If name_not_typename was ever used in an lvalue
 751    context where only a name could occur, this might be useful.
 752         |       NAME_OR_INT
 753  */
 754         ;
 755
 756 %%
 757
 758 /* Take care of parsing a number (anything that starts with a digit).
 759    Set yylval and return the token type; update lexptr.
 760    LEN is the number of characters in it.  */
 761
 762 /*** Needs some error checking for the float case ***/
 763
 764 static int
 765 parse_number (p, len, parsed_float, putithere)
 766      char *p;
 767      int len;
 768      int parsed_float;
 769      YYSTYPE *putithere;
 770 {
 771   /* FIXME: Shouldn't these be unsigned?  We don't deal with negative values
 772      here, and we do kind of silly things like cast to unsigned.  */
 773   LONGEST n = 0;
 774   LONGEST prevn = 0;
 775   ULONGEST un;
 776
 777   int i = 0;
 778   int c;
 779   int base = input_radix;
 780   int unsigned_p = 0;
 781
 782   /* Number of "L" suffixes encountered.  */
 783   int long_p = 0;
 784
 785   /* We have found a "L" or "U" suffix.  */
 786   int found_suffix = 0;
 787
 788   ULONGEST high_bit;
 789   struct type *signed_type;
 790   struct type *unsigned_type;
 791
 792   if (parsed_float)
 793     {
 794       /* It's a float since it contains a point or an exponent.  */
 795       char c;
 796       int num = 0;      /* number of tokens scanned by scanf */
 797       char saved_char = p[len];
 798
 799       p[len] = 0;       /* null-terminate the token */
 800       num = sscanf (p, DOUBLEST_SCAN_FORMAT "%c",
 801                     &putithere->typed_val_float.dval, &c);
 802       p[len] = saved_char;      /* restore the input stream */
 803       if (num != 1)             /* check scanf found ONLY a float ... */
 804         return ERROR;
 805       /* See if it has `f' or `l' suffix (float or long double).  */
 806
 807       c = tolower (p[len - 1]);
 808
 809       if (c == 'f')
 810         putithere->typed_val_float.type = builtin_type_float;
 811       else if (c == 'l')
 812         putithere->typed_val_float.type = builtin_type_long_double;
 813       else if (isdigit (c) || c == '.')
 814         putithere->typed_val_float.type = builtin_type_double;
 815       else
 816         return ERROR;
 817
 818       return FLOAT;
 819     }
 820
 821   /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
 822   if (p[0] == '0')
 823     switch (p[1])
 824       {
 825       case 'x':
 826       case 'X':
 827         if (len >= 3)
 828           {
 829             p += 2;
 830             base = 16;
 831             len -= 2;
 832           }
 833         break;
 834
 835       case 't':
 836       case 'T':
 837       case 'd':
 838       case 'D':
 839         if (len >= 3)
 840           {
 841             p += 2;
 842             base = 10;
 843             len -= 2;
 844           }
 845         break;
 846
 847       default:
 848         base = 8;
 849         break;
 850       }
 851
 852   while (len-- > 0)
 853     {
 854       c = *p++;
 855       if (c >= 'A' && c <= 'Z')
 856         c += 'a' - 'A';
 857       if (c != 'l' && c != 'u')
 858         n *= base;
 859       if (c >= '0' && c <= '9')
 860         {
 861           if (found_suffix)
 862             return ERROR;
 863           n += i = c - '0';
 864         }
 865       else
 866         {
 867           if (base > 10 && c >= 'a' && c <= 'f')
 868             {
 869               if (found_suffix)
 870                 return ERROR;
 871               n += i = c - 'a' + 10;
 872             }
 873           else if (c == 'l')
 874             {
 875               ++long_p;
 876               found_suffix = 1;
 877             }
 878           else if (c == 'u')
 879             {
 880               unsigned_p = 1;
 881               found_suffix = 1;
 882             }
 883           else
 884             return ERROR;       /* Char not a digit */
 885         }
 886       if (i >= base)
 887         return ERROR;           /* Invalid digit in this base */
 888
 889       /* Portably test for overflow (only works for nonzero values, so make
 890          a second check for zero).  FIXME: Can't we just make n and prevn
 891          unsigned and avoid this?  */
 892       if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
 893         unsigned_p = 1;         /* Try something unsigned */
 894
 895       /* Portably test for unsigned overflow.
 896          FIXME: This check is wrong; for example it doesn't find overflow
 897          on 0x123456789 when LONGEST is 32 bits.  */
 898       if (c != 'l' && c != 'u' && n != 0)
 899         {
 900           if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
 901             error ("Numeric constant too large.");
 902         }
 903       prevn = n;
 904     }
 905
 906   /* An integer constant is an int, a long, or a long long.  An L
 907      suffix forces it to be long; an LL suffix forces it to be long
 908      long.  If not forced to a larger size, it gets the first type of
 909      the above that it fits in.  To figure out whether it fits, we
 910      shift it right and see whether anything remains.  Note that we
 911      can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
 912      operation, because many compilers will warn about such a shift
 913      (which always produces a zero result).  Sometimes TARGET_INT_BIT
 914      or TARGET_LONG_BIT will be that big, sometimes not.  To deal with
 915      the case where it is we just always shift the value more than
 916      once, with fewer bits each time.  */
 917
 918   un = (ULONGEST)n >> 2;
 919   if (long_p == 0
 920       && (un >> (TARGET_INT_BIT - 2)) == 0)
 921     {
 922       high_bit = ((ULONGEST)1) << (TARGET_INT_BIT-1);
 923
 924       /* A large decimal (not hex or octal) constant (between INT_MAX
 925          and UINT_MAX) is a long or unsigned long, according to ANSI,
 926          never an unsigned int, but this code treats it as unsigned
 927          int.  This probably should be fixed.  GCC gives a warning on
 928          such constants.  */
 929
 930       unsigned_type = builtin_type_unsigned_int;
 931       signed_type = builtin_type_int;
 932     }
 933   else if (long_p <= 1
 934            && (un >> (TARGET_LONG_BIT - 2)) == 0)
 935     {
 936       high_bit = ((ULONGEST)1) << (TARGET_LONG_BIT-1);
 937       unsigned_type = builtin_type_unsigned_long;
 938       signed_type = builtin_type_long;
 939     }
 940   else
 941     {
 942       int shift;
 943       if (sizeof (ULONGEST) * HOST_CHAR_BIT < TARGET_LONG_LONG_BIT)
 944         /* A long long does not fit in a LONGEST.  */
 945         shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
 946       else
 947         shift = (TARGET_LONG_LONG_BIT - 1);
 948       high_bit = (ULONGEST) 1 << shift;
 949       unsigned_type = builtin_type_unsigned_long_long;
 950       signed_type = builtin_type_long_long;
 951     }
 952
 953    putithere->typed_val_int.val = n;
 954
 955    /* If the high bit of the worked out type is set then this number
 956       has to be unsigned. */
 957
 958    if (unsigned_p || (n & high_bit))
 959      {
 960        putithere->typed_val_int.type = unsigned_type;
 961      }
 962    else
 963      {
 964        putithere->typed_val_int.type = signed_type;
 965      }
 966
 967    return INT;
 968 }
 969
 970
 971 struct type_push
 972 {
 973   struct type *stored;
 974   struct type_push *next;
 975 };
 976
 977 static struct type_push *tp_top = NULL;
 978
 979 static void
 980 push_current_type (void)
 981 {
 982   struct type_push *tpnew;
 983   tpnew = (struct type_push *) malloc (sizeof (struct type_push));
 984   tpnew->next = tp_top;
 985   tpnew->stored = current_type;
 986   current_type = NULL;
 987   tp_top = tpnew;
 988 }
 989
 990 static void
 991 pop_current_type (void)
 992 {
 993   struct type_push *tp = tp_top;
 994   if (tp)
 995     {
 996       current_type = tp->stored;
 997       tp_top = tp->next;
 998       xfree (tp);
 999     }
1000 }
1001
1002 struct token
1003 {
1004   char *operator;
1005   int token;
1006   enum exp_opcode opcode;
1007 };
1008
1009 static const struct token tokentab3[] =
1010   {
1011     {"shr", RSH, BINOP_END},
1012     {"shl", LSH, BINOP_END},
1013     {"and", ANDAND, BINOP_END},
1014     {"div", DIV, BINOP_END},
1015     {"not", NOT, BINOP_END},
1016     {"mod", MOD, BINOP_END},
1017     {"inc", INCREMENT, BINOP_END},
1018     {"dec", DECREMENT, BINOP_END},
1019     {"xor", XOR, BINOP_END}
1020   };
1021
1022 static const struct token tokentab2[] =
1023   {
1024     {"or", OR, BINOP_END},
1025     {"<>", NOTEQUAL, BINOP_END},
1026     {"<=", LEQ, BINOP_END},
1027     {">=", GEQ, BINOP_END},
1028     {":=", ASSIGN, BINOP_END},
1029     {"::", COLONCOLON, BINOP_END} };
1030
1031 /* Allocate uppercased var */
1032 /* make an uppercased copy of tokstart */
1033 static char * uptok (tokstart, namelen)
1034   char *tokstart;
1035   int namelen;
1036 {
1037   int i;
1038   char *uptokstart = (char *)malloc(namelen+1);
1039   for (i = 0;i <= namelen;i++)
1040     {
1041       if ((tokstart[i]>='a' && tokstart[i]<='z'))
1042         uptokstart[i] = tokstart[i]-('a'-'A');
1043       else
1044         uptokstart[i] = tokstart[i];
1045     }
1046   uptokstart[namelen]='\0';
1047   return uptokstart;
1048 }
1049 /* Read one token, getting characters through lexptr.  */
1050
1051
1052 static int
1053 yylex ()
1054 {
1055   int c;
1056   int namelen;
1057   unsigned int i;
1058   char *tokstart;
1059   char *uptokstart;
1060   char *tokptr;
1061   char *p;
1062   int explen, tempbufindex;
1063   static char *tempbuf;
1064   static int tempbufsize;
1065
1066  retry:
1067
1068   prev_lexptr = lexptr;
1069
1070   tokstart = lexptr;
1071   explen = strlen (lexptr);
1072   /* See if it is a special token of length 3.  */
1073   if (explen > 2)
1074     for (i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
1075       if (strncasecmp (tokstart, tokentab3[i].operator, 3) == 0
1076           && (!isalpha (tokentab3[i].operator[0]) || explen == 3
1077               || (!isalpha (tokstart[3]) && !isdigit (tokstart[3]) && tokstart[3] != '_')))
1078         {
1079           lexptr += 3;
1080           yylval.opcode = tokentab3[i].opcode;
1081           return tokentab3[i].token;
1082         }
1083
1084   /* See if it is a special token of length 2.  */
1085   if (explen > 1)
1086   for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
1087       if (strncasecmp (tokstart, tokentab2[i].operator, 2) == 0
1088           && (!isalpha (tokentab2[i].operator[0]) || explen == 2
1089               || (!isalpha (tokstart[2]) && !isdigit (tokstart[2]) && tokstart[2] != '_')))
1090         {
1091           lexptr += 2;
1092           yylval.opcode = tokentab2[i].opcode;
1093           return tokentab2[i].token;
1094         }
1095
1096   switch (c = *tokstart)
1097     {
1098     case 0:
1099       return 0;
1100
1101     case ' ':
1102     case '\t':
1103     case '\n':
1104       lexptr++;
1105       goto retry;
1106
1107     case '\'':
1108       /* We either have a character constant ('0' or '\177' for example)
1109          or we have a quoted symbol reference ('foo(int,int)' in object pascal
1110          for example). */
1111       lexptr++;
1112       c = *lexptr++;
1113       if (c == '\\')
1114         c = parse_escape (&lexptr);
1115       else if (c == '\'')
1116         error ("Empty character constant.");
1117
1118       yylval.typed_val_int.val = c;
1119       yylval.typed_val_int.type = builtin_type_char;
1120
1121       c = *lexptr++;
1122       if (c != '\'')
1123         {
1124           namelen = skip_quoted (tokstart) - tokstart;
1125           if (namelen > 2)
1126             {
1127               lexptr = tokstart + namelen;
1128               if (lexptr[-1] != '\'')
1129                 error ("Unmatched single quote.");
1130               namelen -= 2;
1131               tokstart++;
1132               uptokstart = uptok(tokstart,namelen);
1133               goto tryname;
1134             }
1135           error ("Invalid character constant.");
1136         }
1137       return INT;
1138
1139     case '(':
1140       paren_depth++;
1141       lexptr++;
1142       return c;
1143
1144     case ')':
1145       if (paren_depth == 0)
1146         return 0;
1147       paren_depth--;
1148       lexptr++;
1149       return c;
1150
1151     case ',':
1152       if (comma_terminates && paren_depth == 0)
1153         return 0;
1154       lexptr++;
1155       return c;
1156
1157     case '.':
1158       /* Might be a floating point number.  */
1159       if (lexptr[1] < '0' || lexptr[1] > '9')
1160         goto symbol;            /* Nope, must be a symbol. */
1161       /* FALL THRU into number case.  */
1162
1163     case '0':
1164     case '1':
1165     case '2':
1166     case '3':
1167     case '4':
1168     case '5':
1169     case '6':
1170     case '7':
1171     case '8':
1172     case '9':
1173       {
1174         /* It's a number.  */
1175         int got_dot = 0, got_e = 0, toktype;
1176         char *p = tokstart;
1177         int hex = input_radix > 10;
1178
1179         if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1180           {
1181             p += 2;
1182             hex = 1;
1183           }
1184         else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1185           {
1186             p += 2;
1187             hex = 0;
1188           }
1189
1190         for (;; ++p)
1191           {
1192             /* This test includes !hex because 'e' is a valid hex digit
1193                and thus does not indicate a floating point number when
1194                the radix is hex.  */
1195             if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1196               got_dot = got_e = 1;
1197             /* This test does not include !hex, because a '.' always indicates
1198                a decimal floating point number regardless of the radix.  */
1199             else if (!got_dot && *p == '.')
1200               got_dot = 1;
1201             else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1202                      && (*p == '-' || *p == '+'))
1203               /* This is the sign of the exponent, not the end of the
1204                  number.  */
1205               continue;
1206             /* We will take any letters or digits.  parse_number will
1207                complain if past the radix, or if L or U are not final.  */
1208             else if ((*p < '0' || *p > '9')
1209                      && ((*p < 'a' || *p > 'z')
1210                                   && (*p < 'A' || *p > 'Z')))
1211               break;
1212           }
1213         toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1214         if (toktype == ERROR)
1215           {
1216             char *err_copy = (char *) alloca (p - tokstart + 1);
1217
1218             memcpy (err_copy, tokstart, p - tokstart);
1219             err_copy[p - tokstart] = 0;
1220             error ("Invalid number \"%s\".", err_copy);
1221           }
1222         lexptr = p;
1223         return toktype;
1224       }
1225
1226     case '+':
1227     case '-':
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     symbol:
1246       lexptr++;
1247       return c;
1248
1249     case '"':
1250
1251       /* Build the gdb internal form of the input string in tempbuf,
1252          translating any standard C escape forms seen.  Note that the
1253          buffer is null byte terminated *only* for the convenience of
1254          debugging gdb itself and printing the buffer contents when
1255          the buffer contains no embedded nulls.  Gdb does not depend
1256          upon the buffer being null byte terminated, it uses the length
1257          string instead.  This allows gdb to handle C strings (as well
1258          as strings in other languages) with embedded null bytes */
1259
1260       tokptr = ++tokstart;
1261       tempbufindex = 0;
1262
1263       do {
1264         /* Grow the static temp buffer if necessary, including allocating
1265            the first one on demand. */
1266         if (tempbufindex + 1 >= tempbufsize)
1267           {
1268             tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1269           }
1270
1271         switch (*tokptr)
1272           {
1273           case '\0':
1274           case '"':
1275             /* Do nothing, loop will terminate. */
1276             break;
1277           case '\\':
1278             tokptr++;
1279             c = parse_escape (&tokptr);
1280             if (c == -1)
1281               {
1282                 continue;
1283               }
1284             tempbuf[tempbufindex++] = c;
1285             break;
1286           default:
1287             tempbuf[tempbufindex++] = *tokptr++;
1288             break;
1289           }
1290       } while ((*tokptr != '"') && (*tokptr != '\0'));
1291       if (*tokptr++ != '"')
1292         {
1293           error ("Unterminated string in expression.");
1294         }
1295       tempbuf[tempbufindex] = '\0';     /* See note above */
1296       yylval.sval.ptr = tempbuf;
1297       yylval.sval.length = tempbufindex;
1298       lexptr = tokptr;
1299       return (STRING);
1300     }
1301
1302   if (!(c == '_' || c == '$'
1303         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1304     /* We must have come across a bad character (e.g. ';').  */
1305     error ("Invalid character '%c' in expression.", c);
1306
1307   /* It's a name.  See how long it is.  */
1308   namelen = 0;
1309   for (c = tokstart[namelen];
1310        (c == '_' || c == '$' || (c >= '0' && c <= '9')
1311         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1312     {
1313       /* Template parameter lists are part of the name.
1314          FIXME: This mishandles `print $a<4&&$a>3'.  */
1315       if (c == '<')
1316         {
1317           int i = namelen;
1318           int nesting_level = 1;
1319           while (tokstart[++i])
1320             {
1321               if (tokstart[i] == '<')
1322                 nesting_level++;
1323               else if (tokstart[i] == '>')
1324                 {
1325                   if (--nesting_level == 0)
1326                     break;
1327                 }
1328             }
1329           if (tokstart[i] == '>')
1330             namelen = i;
1331           else
1332             break;
1333         }
1334
1335       /* do NOT uppercase internals because of registers !!! */
1336       c = tokstart[++namelen];
1337     }
1338
1339   uptokstart = uptok(tokstart,namelen);
1340
1341   /* The token "if" terminates the expression and is NOT
1342      removed from the input stream.  */
1343   if (namelen == 2 && uptokstart[0] == 'I' && uptokstart[1] == 'F')
1344     {
1345       return 0;
1346     }
1347
1348   lexptr += namelen;
1349
1350   tryname:
1351
1352   /* Catch specific keywords.  Should be done with a data structure.  */
1353   switch (namelen)
1354     {
1355     case 6:
1356       if (DEPRECATED_STREQ (uptokstart, "OBJECT"))
1357         return CLASS;
1358       if (DEPRECATED_STREQ (uptokstart, "RECORD"))
1359         return STRUCT;
1360       if (DEPRECATED_STREQ (uptokstart, "SIZEOF"))
1361         return SIZEOF;
1362       break;
1363     case 5:
1364       if (DEPRECATED_STREQ (uptokstart, "CLASS"))
1365         return CLASS;
1366       if (DEPRECATED_STREQ (uptokstart, "FALSE"))
1367         {
1368           yylval.lval = 0;
1369           return FALSEKEYWORD;
1370         }
1371       break;
1372     case 4:
1373       if (DEPRECATED_STREQ (uptokstart, "TRUE"))
1374         {
1375           yylval.lval = 1;
1376           return TRUEKEYWORD;
1377         }
1378       if (DEPRECATED_STREQ (uptokstart, "SELF"))
1379         {
1380           /* here we search for 'this' like
1381              inserted in FPC stabs debug info */
1382           static const char this_name[] = "this";
1383
1384           if (lookup_symbol (this_name, expression_context_block,
1385                              VAR_DOMAIN, (int *) NULL,
1386                              (struct symtab **) NULL))
1387             return THIS;
1388         }
1389       break;
1390     default:
1391       break;
1392     }
1393
1394   yylval.sval.ptr = tokstart;
1395   yylval.sval.length = namelen;
1396
1397   if (*tokstart == '$')
1398     {
1399       /* $ is the normal prefix for pascal hexadecimal values
1400         but this conflicts with the GDB use for debugger variables
1401         so in expression to enter hexadecimal values
1402         we still need to use C syntax with 0xff  */
1403       write_dollar_variable (yylval.sval);
1404       return VARIABLE;
1405     }
1406
1407   /* Use token-type BLOCKNAME for symbols that happen to be defined as
1408      functions or symtabs.  If this is not so, then ...
1409      Use token-type TYPENAME for symbols that happen to be defined
1410      currently as names of types; NAME for other symbols.
1411      The caller is not constrained to care about the distinction.  */
1412   {
1413     char *tmp = copy_name (yylval.sval);
1414     struct symbol *sym;
1415     int is_a_field_of_this = 0;
1416     int is_a_field = 0;
1417     int hextype;
1418
1419
1420     if (search_field && current_type)
1421       is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1422     if (is_a_field)
1423       sym = NULL;
1424     else
1425       sym = lookup_symbol (tmp, expression_context_block,
1426                            VAR_DOMAIN,
1427                            &is_a_field_of_this,
1428                            (struct symtab **) NULL);
1429     /* second chance uppercased (as Free Pascal does).  */
1430     if (!sym && !is_a_field_of_this && !is_a_field)
1431       {
1432        for (i = 0; i <= namelen; i++)
1433          {
1434            if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1435              tmp[i] -= ('a'-'A');
1436          }
1437        if (search_field && current_type)
1438          is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1439        if (is_a_field)
1440          sym = NULL;
1441        else
1442          sym = lookup_symbol (tmp, expression_context_block,
1443                         VAR_DOMAIN,
1444                         &is_a_field_of_this,
1445                         (struct symtab **) NULL);
1446        if (sym || is_a_field_of_this || is_a_field)
1447          for (i = 0; i <= namelen; i++)
1448            {
1449              if ((tokstart[i] >= 'a' && tokstart[i] <= 'z'))
1450                tokstart[i] -= ('a'-'A');
1451            }
1452       }
1453     /* Third chance Capitalized (as GPC does).  */
1454     if (!sym && !is_a_field_of_this && !is_a_field)
1455       {
1456        for (i = 0; i <= namelen; i++)
1457          {
1458            if (i == 0)
1459              {
1460               if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1461                 tmp[i] -= ('a'-'A');
1462              }
1463            else
1464            if ((tmp[i] >= 'A' && tmp[i] <= 'Z'))
1465              tmp[i] -= ('A'-'a');
1466           }
1467        if (search_field && current_type)
1468          is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1469        if (is_a_field)
1470          sym = NULL;
1471        else
1472          sym = lookup_symbol (tmp, expression_context_block,
1473                          VAR_DOMAIN,
1474                          &is_a_field_of_this,
1475                          (struct symtab **) NULL);
1476        if (sym || is_a_field_of_this || is_a_field)
1477           for (i = 0; i <= namelen; i++)
1478             {
1479               if (i == 0)
1480                 {
1481                   if ((tokstart[i] >= 'a' && tokstart[i] <= 'z'))
1482                     tokstart[i] -= ('a'-'A');
1483                 }
1484               else
1485                 if ((tokstart[i] >= 'A' && tokstart[i] <= 'Z'))
1486                   tokstart[i] -= ('A'-'a');
1487             }
1488       }
1489
1490     if (is_a_field)
1491       {
1492         tempbuf = (char *) realloc (tempbuf, namelen + 1);
1493         strncpy (tempbuf, tokstart, namelen); tempbuf [namelen] = 0;
1494         yylval.sval.ptr = tempbuf;
1495         yylval.sval.length = namelen;
1496         return FIELDNAME;
1497       }
1498     /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1499        no psymtabs (coff, xcoff, or some future change to blow away the
1500        psymtabs once once symbols are read).  */
1501     if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK) ||
1502         lookup_symtab (tmp))
1503       {
1504         yylval.ssym.sym = sym;
1505         yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1506         return BLOCKNAME;
1507       }
1508     if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1509         {
1510 #if 1
1511           /* Despite the following flaw, we need to keep this code enabled.
1512              Because we can get called from check_stub_method, if we don't
1513              handle nested types then it screws many operations in any
1514              program which uses nested types.  */
1515           /* In "A::x", if x is a member function of A and there happens
1516              to be a type (nested or not, since the stabs don't make that
1517              distinction) named x, then this code incorrectly thinks we
1518              are dealing with nested types rather than a member function.  */
1519
1520           char *p;
1521           char *namestart;
1522           struct symbol *best_sym;
1523
1524           /* Look ahead to detect nested types.  This probably should be
1525              done in the grammar, but trying seemed to introduce a lot
1526              of shift/reduce and reduce/reduce conflicts.  It's possible
1527              that it could be done, though.  Or perhaps a non-grammar, but
1528              less ad hoc, approach would work well.  */
1529
1530           /* Since we do not currently have any way of distinguishing
1531              a nested type from a non-nested one (the stabs don't tell
1532              us whether a type is nested), we just ignore the
1533              containing type.  */
1534
1535           p = lexptr;
1536           best_sym = sym;
1537           while (1)
1538             {
1539               /* Skip whitespace.  */
1540               while (*p == ' ' || *p == '\t' || *p == '\n')
1541                 ++p;
1542               if (*p == ':' && p[1] == ':')
1543                 {
1544                   /* Skip the `::'.  */
1545                   p += 2;
1546                   /* Skip whitespace.  */
1547                   while (*p == ' ' || *p == '\t' || *p == '\n')
1548                     ++p;
1549                   namestart = p;
1550                   while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1551                          || (*p >= 'a' && *p <= 'z')
1552                          || (*p >= 'A' && *p <= 'Z'))
1553                     ++p;
1554                   if (p != namestart)
1555                     {
1556                       struct symbol *cur_sym;
1557                       /* As big as the whole rest of the expression, which is
1558                          at least big enough.  */
1559                       char *ncopy = alloca (strlen (tmp)+strlen (namestart)+3);
1560                       char *tmp1;
1561
1562                       tmp1 = ncopy;
1563                       memcpy (tmp1, tmp, strlen (tmp));
1564                       tmp1 += strlen (tmp);
1565                       memcpy (tmp1, "::", 2);
1566                       tmp1 += 2;
1567                       memcpy (tmp1, namestart, p - namestart);
1568                       tmp1[p - namestart] = '\0';
1569                       cur_sym = lookup_symbol (ncopy, expression_context_block,
1570                                                VAR_DOMAIN, (int *) NULL,
1571                                                (struct symtab **) NULL);
1572                       if (cur_sym)
1573                         {
1574                           if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1575                             {
1576                               best_sym = cur_sym;
1577                               lexptr = p;
1578                             }
1579                           else
1580                             break;
1581                         }
1582                       else
1583                         break;
1584                     }
1585                   else
1586                     break;
1587                 }
1588               else
1589                 break;
1590             }
1591
1592           yylval.tsym.type = SYMBOL_TYPE (best_sym);
1593 #else /* not 0 */
1594           yylval.tsym.type = SYMBOL_TYPE (sym);
1595 #endif /* not 0 */
1596           return TYPENAME;
1597         }
1598     yylval.tsym.type
1599       = language_lookup_primitive_type_by_name (current_language,
1600                                                 current_gdbarch, tmp);
1601     if (yylval.tsym.type != NULL)
1602       return TYPENAME;
1603
1604     /* Input names that aren't symbols but ARE valid hex numbers,
1605        when the input radix permits them, can be names or numbers
1606        depending on the parse.  Note we support radixes > 16 here.  */
1607     if (!sym &&
1608         ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1609          (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1610       {
1611         YYSTYPE newlval;        /* Its value is ignored.  */
1612         hextype = parse_number (tokstart, namelen, 0, &newlval);
1613         if (hextype == INT)
1614           {
1615             yylval.ssym.sym = sym;
1616             yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1617             return NAME_OR_INT;
1618           }
1619       }
1620
1621     free(uptokstart);
1622     /* Any other kind of symbol */
1623     yylval.ssym.sym = sym;
1624     yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1625     return NAME;
1626   }
1627 }
1628
1629 void
1630 yyerror (msg)
1631      char *msg;
1632 {
1633   if (prev_lexptr)
1634     lexptr = prev_lexptr;
1635
1636   error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);
1637 }