gdb/p-exp.y

   1 /* YACC parser for Pascal expressions, for GDB.
   2    Copyright (C) 2000, 2006, 2007 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., 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 /* This file is derived from c-exp.y */
  22
  23 /* Parse a Pascal expression from text in a string,
  24    and return the result as a  struct expression  pointer.
  25    That structure contains arithmetic operations in reverse polish,
  26    with constants represented by operations that are followed by special data.
  27    See expression.h for the details of the format.
  28    What is important here is that it can be built up sequentially
  29    during the process of parsing; the lower levels of the tree always
  30    come first in the result.
  31
  32    Note that malloc's and realloc's in this file are transformed to
  33    xmalloc and xrealloc respectively by the same sed command in the
  34    makefile that remaps any other malloc/realloc inserted by the parser
  35    generator.  Doing this with #defines and trying to control the interaction
  36    with include files (<malloc.h> and <stdlib.h> for example) just became
  37    too messy, particularly when such includes can be inserted at random
  38    times by the parser generator.  */
  39
  40 /* Known bugs or limitations:
  41     - pascal string operations are not supported at all.
  42     - there are some problems with boolean types.
  43     - Pascal type hexadecimal constants are not supported
  44       because they conflict with the internal variables format.
  45    Probably also lots of other problems, less well defined PM */
  46 %{
  47
  48 #include "defs.h"
  49 #include "gdb_string.h"
  50 #include <ctype.h>
  51 #include "expression.h"
  52 #include "value.h"
  53 #include "parser-defs.h"
  54 #include "language.h"
  55 #include "p-lang.h"
  56 #include "bfd.h" /* Required by objfiles.h.  */
  57 #include "symfile.h" /* Required by objfiles.h.  */
  58 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
  59 #include "block.h"
  60
  61 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
  62    as well as gratuitiously global symbol names, so we can have multiple
  63    yacc generated parsers in gdb.  Note that these are only the variables
  64    produced by yacc.  If other parser generators (bison, byacc, etc) produce
  65    additional global names that conflict at link time, then those parser
  66    generators need to be fixed instead of adding those names to this list. */
  67
  68 #define yymaxdepth pascal_maxdepth
  69 #define yyparse pascal_parse
  70 #define yylex   pascal_lex
  71 #define yyerror pascal_error
  72 #define yylval  pascal_lval
  73 #define yychar  pascal_char
  74 #define yydebug pascal_debug
  75 #define yypact  pascal_pact
  76 #define yyr1    pascal_r1
  77 #define yyr2    pascal_r2
  78 #define yydef   pascal_def
  79 #define yychk   pascal_chk
  80 #define yypgo   pascal_pgo
  81 #define yyact   pascal_act
  82 #define yyexca  pascal_exca
  83 #define yyerrflag pascal_errflag
  84 #define yynerrs pascal_nerrs
  85 #define yyps    pascal_ps
  86 #define yypv    pascal_pv
  87 #define yys     pascal_s
  88 #define yy_yys  pascal_yys
  89 #define yystate pascal_state
  90 #define yytmp   pascal_tmp
  91 #define yyv     pascal_v
  92 #define yy_yyv  pascal_yyv
  93 #define yyval   pascal_val
  94 #define yylloc  pascal_lloc
  95 #define yyreds  pascal_reds             /* With YYDEBUG defined */
  96 #define yytoks  pascal_toks             /* With YYDEBUG defined */
  97 #define yyname  pascal_name             /* With YYDEBUG defined */
  98 #define yyrule  pascal_rule             /* With YYDEBUG defined */
  99 #define yylhs   pascal_yylhs
 100 #define yylen   pascal_yylen
 101 #define yydefred pascal_yydefred
 102 #define yydgoto pascal_yydgoto
 103 #define yysindex pascal_yysindex
 104 #define yyrindex pascal_yyrindex
 105 #define yygindex pascal_yygindex
 106 #define yytable  pascal_yytable
 107 #define yycheck  pascal_yycheck
 108
 109 #ifndef YYDEBUG
 110 #define YYDEBUG 1               /* Default to yydebug support */
 111 #endif
 112
 113 #define YYFPRINTF parser_fprintf
 114
 115 int yyparse (void);
 116
 117 static int yylex (void);
 118
 119 void
 120 yyerror (char *);
 121
 122 static char * uptok (char *, int);
 123 %}
 124
 125 /* Although the yacc "value" of an expression is not used,
 126    since the result is stored in the structure being created,
 127    other node types do have values.  */
 128
 129 %union
 130   {
 131     LONGEST lval;
 132     struct {
 133       LONGEST val;
 134       struct type *type;
 135     } typed_val_int;
 136     struct {
 137       DOUBLEST dval;
 138       struct type *type;
 139     } typed_val_float;
 140     struct symbol *sym;
 141     struct type *tval;
 142     struct stoken sval;
 143     struct ttype tsym;
 144     struct symtoken ssym;
 145     int voidval;
 146     struct block *bval;
 147     enum exp_opcode opcode;
 148     struct internalvar *ivar;
 149
 150     struct type **tvec;
 151     int *ivec;
 152   }
 153
 154 %{
 155 /* YYSTYPE gets defined by %union */
 156 static int
 157 parse_number (char *, int, int, YYSTYPE *);
 158
 159 static struct type *current_type;
 160
 161 static void push_current_type (void);
 162 static void pop_current_type (void);
 163 static int search_field;
 164 %}
 165
 166 %type <voidval> exp exp1 type_exp start normal_start variable qualified_name
 167 %type <tval> type typebase
 168 /* %type <bval> block */
 169
 170 /* Fancy type parsing.  */
 171 %type <tval> ptype
 172
 173 %token <typed_val_int> INT
 174 %token <typed_val_float> FLOAT
 175
 176 /* Both NAME and TYPENAME tokens represent symbols in the input,
 177    and both convey their data as strings.
 178    But a TYPENAME is a string that happens to be defined as a typedef
 179    or builtin type name (such as int or char)
 180    and a NAME is any other symbol.
 181    Contexts where this distinction is not important can use the
 182    nonterminal "name", which matches either NAME or TYPENAME.  */
 183
 184 %token <sval> STRING
 185 %token <sval> FIELDNAME
 186 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
 187 %token <tsym> TYPENAME
 188 %type <sval> name
 189 %type <ssym> name_not_typename
 190
 191 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
 192    but which would parse as a valid number in the current input radix.
 193    E.g. "c" when input_radix==16.  Depending on the parse, it will be
 194    turned into a name or into a number.  */
 195
 196 %token <ssym> NAME_OR_INT
 197
 198 %token STRUCT CLASS SIZEOF COLONCOLON
 199 %token ERROR
 200
 201 /* Special type cases, put in to allow the parser to distinguish different
 202    legal basetypes.  */
 203
 204 %token <voidval> VARIABLE
 205
 206
 207 /* Object pascal */
 208 %token THIS
 209 %token <lval> TRUEKEYWORD FALSEKEYWORD
 210
 211 %left ','
 212 %left ABOVE_COMMA
 213 %right ASSIGN
 214 %left NOT
 215 %left OR
 216 %left XOR
 217 %left ANDAND
 218 %left '=' NOTEQUAL
 219 %left '<' '>' LEQ GEQ
 220 %left LSH RSH DIV MOD
 221 %left '@'
 222 %left '+' '-'
 223 %left '*' '/'
 224 %right UNARY INCREMENT DECREMENT
 225 %right ARROW '.' '[' '('
 226 %left '^'
 227 %token <ssym> BLOCKNAME
 228 %type <bval> block
 229 %left COLONCOLON
 230
 231 \f
 232 %%
 233
 234 start   :       { current_type = NULL;
 235                   search_field = 0;
 236                 }
 237                 normal_start {}
 238         ;
 239
 240 normal_start    :
 241                 exp1
 242         |       type_exp
 243         ;
 244
 245 type_exp:       type
 246                         { write_exp_elt_opcode(OP_TYPE);
 247                           write_exp_elt_type($1);
 248                           write_exp_elt_opcode(OP_TYPE);
 249                           current_type = $1; } ;
 250
 251 /* Expressions, including the comma operator.  */
 252 exp1    :       exp
 253         |       exp1 ',' exp
 254                         { write_exp_elt_opcode (BINOP_COMMA); }
 255         ;
 256
 257 /* Expressions, not including the comma operator.  */
 258 exp     :       exp '^'   %prec UNARY
 259                         { write_exp_elt_opcode (UNOP_IND);
 260                           if (current_type)
 261                             current_type = TYPE_TARGET_TYPE (current_type); }
 262         ;
 263
 264 exp     :       '@' exp    %prec UNARY
 265                         { write_exp_elt_opcode (UNOP_ADDR);
 266                           if (current_type)
 267                             current_type = TYPE_POINTER_TYPE (current_type); }
 268         ;
 269
 270 exp     :       '-' exp    %prec UNARY
 271                         { write_exp_elt_opcode (UNOP_NEG); }
 272         ;
 273
 274 exp     :       NOT exp    %prec UNARY
 275                         { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
 276         ;
 277
 278 exp     :       INCREMENT '(' exp ')'   %prec UNARY
 279                         { write_exp_elt_opcode (UNOP_PREINCREMENT); }
 280         ;
 281
 282 exp     :       DECREMENT  '(' exp ')'   %prec UNARY
 283                         { write_exp_elt_opcode (UNOP_PREDECREMENT); }
 284         ;
 285
 286 exp     :       exp '.' { search_field = 1; }
 287                 FIELDNAME
 288                 /* name */
 289                         { write_exp_elt_opcode (STRUCTOP_STRUCT);
 290                           write_exp_string ($4);
 291                           write_exp_elt_opcode (STRUCTOP_STRUCT);
 292                           search_field = 0;
 293                           if (current_type)
 294                             { while (TYPE_CODE (current_type) == TYPE_CODE_PTR)
 295                                 current_type = TYPE_TARGET_TYPE (current_type);
 296                               current_type = lookup_struct_elt_type (
 297                                 current_type, $4.ptr, 0); };
 298                          } ;
 299 exp     :       exp '['
 300                         /* We need to save the current_type value */
 301                         { char *arrayname;
 302                           int arrayfieldindex;
 303                           arrayfieldindex = is_pascal_string_type (
 304                                 current_type, NULL, NULL,
 305                                 NULL, NULL, &arrayname);
 306                           if (arrayfieldindex)
 307                             {
 308                               struct stoken stringsval;
 309                               stringsval.ptr = alloca (strlen (arrayname) + 1);
 310                               stringsval.length = strlen (arrayname);
 311                               strcpy (stringsval.ptr, arrayname);
 312                               current_type = TYPE_FIELD_TYPE (current_type,
 313                                 arrayfieldindex - 1);
 314                               write_exp_elt_opcode (STRUCTOP_STRUCT);
 315                               write_exp_string (stringsval);
 316                               write_exp_elt_opcode (STRUCTOP_STRUCT);
 317                             }
 318                           push_current_type ();  }
 319                 exp1 ']'
 320                         { pop_current_type ();
 321                           write_exp_elt_opcode (BINOP_SUBSCRIPT);
 322                           if (current_type)
 323                             current_type = TYPE_TARGET_TYPE (current_type); }
 324         ;
 325
 326 exp     :       exp '('
 327                         /* This is to save the value of arglist_len
 328                            being accumulated by an outer function call.  */
 329                         { push_current_type ();
 330                           start_arglist (); }
 331                 arglist ')'     %prec ARROW
 332                         { write_exp_elt_opcode (OP_FUNCALL);
 333                           write_exp_elt_longcst ((LONGEST) end_arglist ());
 334                           write_exp_elt_opcode (OP_FUNCALL);
 335                           pop_current_type (); }
 336         ;
 337
 338 arglist :
 339          | exp
 340                         { arglist_len = 1; }
 341          | arglist ',' exp   %prec ABOVE_COMMA
 342                         { arglist_len++; }
 343         ;
 344
 345 exp     :       type '(' exp ')' %prec UNARY
 346                         { if (current_type)
 347                             {
 348                               /* Allow automatic dereference of classes.  */
 349                               if ((TYPE_CODE (current_type) == TYPE_CODE_PTR)
 350                                   && (TYPE_CODE (TYPE_TARGET_TYPE (current_type)) == TYPE_CODE_CLASS)
 351                                   && (TYPE_CODE ($1) == TYPE_CODE_CLASS))
 352                                 write_exp_elt_opcode (UNOP_IND);
 353                             }
 354                           write_exp_elt_opcode (UNOP_CAST);
 355                           write_exp_elt_type ($1);
 356                           write_exp_elt_opcode (UNOP_CAST);
 357                           current_type = $1; }
 358         ;
 359
 360 exp     :       '(' exp1 ')'
 361                         { }
 362         ;
 363
 364 /* Binary operators in order of decreasing precedence.  */
 365
 366 exp     :       exp '*' exp
 367                         { write_exp_elt_opcode (BINOP_MUL); }
 368         ;
 369
 370 exp     :       exp '/' exp
 371                         { write_exp_elt_opcode (BINOP_DIV); }
 372         ;
 373
 374 exp     :       exp DIV exp
 375                         { write_exp_elt_opcode (BINOP_INTDIV); }
 376         ;
 377
 378 exp     :       exp MOD exp
 379                         { write_exp_elt_opcode (BINOP_REM); }
 380         ;
 381
 382 exp     :       exp '+' exp
 383                         { write_exp_elt_opcode (BINOP_ADD); }
 384         ;
 385
 386 exp     :       exp '-' exp
 387                         { write_exp_elt_opcode (BINOP_SUB); }
 388         ;
 389
 390 exp     :       exp LSH exp
 391                         { write_exp_elt_opcode (BINOP_LSH); }
 392         ;
 393
 394 exp     :       exp RSH exp
 395                         { write_exp_elt_opcode (BINOP_RSH); }
 396         ;
 397
 398 exp     :       exp '=' exp
 399                         { write_exp_elt_opcode (BINOP_EQUAL); }
 400         ;
 401
 402 exp     :       exp NOTEQUAL exp
 403                         { write_exp_elt_opcode (BINOP_NOTEQUAL); }
 404         ;
 405
 406 exp     :       exp LEQ exp
 407                         { write_exp_elt_opcode (BINOP_LEQ); }
 408         ;
 409
 410 exp     :       exp GEQ exp
 411                         { write_exp_elt_opcode (BINOP_GEQ); }
 412         ;
 413
 414 exp     :       exp '<' exp
 415                         { write_exp_elt_opcode (BINOP_LESS); }
 416         ;
 417
 418 exp     :       exp '>' exp
 419                         { write_exp_elt_opcode (BINOP_GTR); }
 420         ;
 421
 422 exp     :       exp ANDAND exp
 423                         { write_exp_elt_opcode (BINOP_BITWISE_AND); }
 424         ;
 425
 426 exp     :       exp XOR exp
 427                         { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
 428         ;
 429
 430 exp     :       exp OR exp
 431                         { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
 432         ;
 433
 434 exp     :       exp ASSIGN exp
 435                         { write_exp_elt_opcode (BINOP_ASSIGN); }
 436         ;
 437
 438 exp     :       TRUEKEYWORD
 439                         { write_exp_elt_opcode (OP_BOOL);
 440                           write_exp_elt_longcst ((LONGEST) $1);
 441                           write_exp_elt_opcode (OP_BOOL); }
 442         ;
 443
 444 exp     :       FALSEKEYWORD
 445                         { write_exp_elt_opcode (OP_BOOL);
 446                           write_exp_elt_longcst ((LONGEST) $1);
 447                           write_exp_elt_opcode (OP_BOOL); }
 448         ;
 449
 450 exp     :       INT
 451                         { write_exp_elt_opcode (OP_LONG);
 452                           write_exp_elt_type ($1.type);
 453                           write_exp_elt_longcst ((LONGEST)($1.val));
 454                           write_exp_elt_opcode (OP_LONG); }
 455         ;
 456
 457 exp     :       NAME_OR_INT
 458                         { YYSTYPE val;
 459                           parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
 460                           write_exp_elt_opcode (OP_LONG);
 461                           write_exp_elt_type (val.typed_val_int.type);
 462                           write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
 463                           write_exp_elt_opcode (OP_LONG);
 464                         }
 465         ;
 466
 467
 468 exp     :       FLOAT
 469                         { write_exp_elt_opcode (OP_DOUBLE);
 470                           write_exp_elt_type ($1.type);
 471                           write_exp_elt_dblcst ($1.dval);
 472                           write_exp_elt_opcode (OP_DOUBLE); }
 473         ;
 474
 475 exp     :       variable
 476         ;
 477
 478 exp     :       VARIABLE
 479                         /* Already written by write_dollar_variable. */
 480         ;
 481
 482 exp     :       SIZEOF '(' type ')'     %prec UNARY
 483                         { write_exp_elt_opcode (OP_LONG);
 484                           write_exp_elt_type (builtin_type_int);
 485                           CHECK_TYPEDEF ($3);
 486                           write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
 487                           write_exp_elt_opcode (OP_LONG); }
 488         ;
 489
 490 exp     :       STRING
 491                         { /* C strings are converted into array constants with
 492                              an explicit null byte added at the end.  Thus
 493                              the array upper bound is the string length.
 494                              There is no such thing in C as a completely empty
 495                              string. */
 496                           char *sp = $1.ptr; int count = $1.length;
 497                           while (count-- > 0)
 498                             {
 499                               write_exp_elt_opcode (OP_LONG);
 500                               write_exp_elt_type (builtin_type_char);
 501                               write_exp_elt_longcst ((LONGEST)(*sp++));
 502                               write_exp_elt_opcode (OP_LONG);
 503                             }
 504                           write_exp_elt_opcode (OP_LONG);
 505                           write_exp_elt_type (builtin_type_char);
 506                           write_exp_elt_longcst ((LONGEST)'\0');
 507                           write_exp_elt_opcode (OP_LONG);
 508                           write_exp_elt_opcode (OP_ARRAY);
 509                           write_exp_elt_longcst ((LONGEST) 0);
 510                           write_exp_elt_longcst ((LONGEST) ($1.length));
 511                           write_exp_elt_opcode (OP_ARRAY); }
 512         ;
 513
 514 /* Object pascal  */
 515 exp     :       THIS
 516                         {
 517                           struct value * this_val;
 518                           struct type * this_type;
 519                           write_exp_elt_opcode (OP_THIS);
 520                           write_exp_elt_opcode (OP_THIS);
 521                           /* we need type of this */
 522                           this_val = value_of_this (0);
 523                           if (this_val)
 524                             this_type = value_type (this_val);
 525                           else
 526                             this_type = NULL;
 527                           if (this_type)
 528                             {
 529                               if (TYPE_CODE (this_type) == TYPE_CODE_PTR)
 530                                 {
 531                                   this_type = TYPE_TARGET_TYPE (this_type);
 532                                   write_exp_elt_opcode (UNOP_IND);
 533                                 }
 534                             }
 535
 536                           current_type = this_type;
 537                         }
 538         ;
 539
 540 /* end of object pascal.  */
 541
 542 block   :       BLOCKNAME
 543                         {
 544                           if ($1.sym != 0)
 545                               $$ = SYMBOL_BLOCK_VALUE ($1.sym);
 546                           else
 547                             {
 548                               struct symtab *tem =
 549                                   lookup_symtab (copy_name ($1.stoken));
 550                               if (tem)
 551                                 $$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem), STATIC_BLOCK);
 552                               else
 553                                 error ("No file or function \"%s\".",
 554                                        copy_name ($1.stoken));
 555                             }
 556                         }
 557         ;
 558
 559 block   :       block COLONCOLON name
 560                         { struct symbol *tem
 561                             = lookup_symbol (copy_name ($3), $1,
 562                                              VAR_DOMAIN, (int *) NULL,
 563                                              (struct symtab **) NULL);
 564                           if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
 565                             error ("No function \"%s\" in specified context.",
 566                                    copy_name ($3));
 567                           $$ = SYMBOL_BLOCK_VALUE (tem); }
 568         ;
 569
 570 variable:       block COLONCOLON name
 571                         { struct symbol *sym;
 572                           sym = lookup_symbol (copy_name ($3), $1,
 573                                                VAR_DOMAIN, (int *) NULL,
 574                                                (struct symtab **) NULL);
 575                           if (sym == 0)
 576                             error ("No symbol \"%s\" in specified context.",
 577                                    copy_name ($3));
 578
 579                           write_exp_elt_opcode (OP_VAR_VALUE);
 580                           /* block_found is set by lookup_symbol.  */
 581                           write_exp_elt_block (block_found);
 582                           write_exp_elt_sym (sym);
 583                           write_exp_elt_opcode (OP_VAR_VALUE); }
 584         ;
 585
 586 qualified_name: typebase COLONCOLON name
 587                         {
 588                           struct type *type = $1;
 589                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 590                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 591                             error ("`%s' is not defined as an aggregate type.",
 592                                    TYPE_NAME (type));
 593
 594                           write_exp_elt_opcode (OP_SCOPE);
 595                           write_exp_elt_type (type);
 596                           write_exp_string ($3);
 597                           write_exp_elt_opcode (OP_SCOPE);
 598                         }
 599         ;
 600
 601 variable:       qualified_name
 602         |       COLONCOLON name
 603                         {
 604                           char *name = copy_name ($2);
 605                           struct symbol *sym;
 606                           struct minimal_symbol *msymbol;
 607
 608                           sym =
 609                             lookup_symbol (name, (const struct block *) NULL,
 610                                            VAR_DOMAIN, (int *) NULL,
 611                                            (struct symtab **) NULL);
 612                           if (sym)
 613                             {
 614                               write_exp_elt_opcode (OP_VAR_VALUE);
 615                               write_exp_elt_block (NULL);
 616                               write_exp_elt_sym (sym);
 617                               write_exp_elt_opcode (OP_VAR_VALUE);
 618                               break;
 619                             }
 620
 621                           msymbol = lookup_minimal_symbol (name, NULL, NULL);
 622                           if (msymbol != NULL)
 623                             {
 624                               write_exp_msymbol (msymbol,
 625                                                  lookup_function_type (builtin_type_int),
 626                                                  builtin_type_int);
 627                             }
 628                           else
 629                             if (!have_full_symbols () && !have_partial_symbols ())
 630                               error ("No symbol table is loaded.  Use the \"file\" command.");
 631                             else
 632                               error ("No symbol \"%s\" in current context.", name);
 633                         }
 634         ;
 635
 636 variable:       name_not_typename
 637                         { struct symbol *sym = $1.sym;
 638
 639                           if (sym)
 640                             {
 641                               if (symbol_read_needs_frame (sym))
 642                                 {
 643                                   if (innermost_block == 0 ||
 644                                       contained_in (block_found,
 645                                                     innermost_block))
 646                                     innermost_block = block_found;
 647                                 }
 648
 649                               write_exp_elt_opcode (OP_VAR_VALUE);
 650                               /* We want to use the selected frame, not
 651                                  another more inner frame which happens to
 652                                  be in the same block.  */
 653                               write_exp_elt_block (NULL);
 654                               write_exp_elt_sym (sym);
 655                               write_exp_elt_opcode (OP_VAR_VALUE);
 656                               current_type = sym->type; }
 657                           else if ($1.is_a_field_of_this)
 658                             {
 659                               struct value * this_val;
 660                               struct type * this_type;
 661                               /* Object pascal: it hangs off of `this'.  Must
 662                                  not inadvertently convert from a method call
 663                                  to data ref.  */
 664                               if (innermost_block == 0 ||
 665                                   contained_in (block_found, innermost_block))
 666                                 innermost_block = block_found;
 667                               write_exp_elt_opcode (OP_THIS);
 668                               write_exp_elt_opcode (OP_THIS);
 669                               write_exp_elt_opcode (STRUCTOP_PTR);
 670                               write_exp_string ($1.stoken);
 671                               write_exp_elt_opcode (STRUCTOP_PTR);
 672                               /* we need type of this */
 673                               this_val = value_of_this (0);
 674                               if (this_val)
 675                                 this_type = value_type (this_val);
 676                               else
 677                                 this_type = NULL;
 678                               if (this_type)
 679                                 current_type = lookup_struct_elt_type (
 680                                   this_type,
 681                                   copy_name ($1.stoken), 0);
 682                               else
 683                                 current_type = NULL;
 684                             }
 685                           else
 686                             {
 687                               struct minimal_symbol *msymbol;
 688                               char *arg = copy_name ($1.stoken);
 689
 690                               msymbol =
 691                                 lookup_minimal_symbol (arg, NULL, NULL);
 692                               if (msymbol != NULL)
 693                                 {
 694                                   write_exp_msymbol (msymbol,
 695                                                      lookup_function_type (builtin_type_int),
 696                                                      builtin_type_int);
 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         ;
 710
 711 /* We used to try to recognize more pointer to member types here, but
 712    that didn't work (shift/reduce conflicts meant that these rules never
 713    got executed).  The problem is that
 714      int (foo::bar::baz::bizzle)
 715    is a function type but
 716      int (foo::bar::baz::bizzle::*)
 717    is a pointer to member type.  Stroustrup loses again!  */
 718
 719 type    :       ptype
 720         ;
 721
 722 typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 723         :       '^' typebase
 724                         { $$ = lookup_pointer_type ($2); }
 725         |       TYPENAME
 726                         { $$ = $1.type; }
 727         |       STRUCT name
 728                         { $$ = lookup_struct (copy_name ($2),
 729                                               expression_context_block); }
 730         |       CLASS name
 731                         { $$ = lookup_struct (copy_name ($2),
 732                                               expression_context_block); }
 733         /* "const" and "volatile" are curently ignored.  A type qualifier
 734            after the type is handled in the ptype rule.  I think these could
 735            be too.  */
 736         ;
 737
 738 name    :       NAME { $$ = $1.stoken; }
 739         |       BLOCKNAME { $$ = $1.stoken; }
 740         |       TYPENAME { $$ = $1.stoken; }
 741         |       NAME_OR_INT  { $$ = $1.stoken; }
 742         ;
 743
 744 name_not_typename :     NAME
 745         |       BLOCKNAME
 746 /* These would be useful if name_not_typename was useful, but it is just
 747    a fake for "variable", so these cause reduce/reduce conflicts because
 748    the parser can't tell whether NAME_OR_INT is a name_not_typename (=variable,
 749    =exp) or just an exp.  If name_not_typename was ever used in an lvalue
 750    context where only a name could occur, this might be useful.
 751         |       NAME_OR_INT
 752  */
 753         ;
 754
 755 %%
 756
 757 /* Take care of parsing a number (anything that starts with a digit).
 758    Set yylval and return the token type; update lexptr.
 759    LEN is the number of characters in it.  */
 760
 761 /*** Needs some error checking for the float case ***/
 762
 763 static int
 764 parse_number (p, len, parsed_float, putithere)
 765      char *p;
 766      int len;
 767      int parsed_float;
 768      YYSTYPE *putithere;
 769 {
 770   /* FIXME: Shouldn't these be unsigned?  We don't deal with negative values
 771      here, and we do kind of silly things like cast to unsigned.  */
 772   LONGEST n = 0;
 773   LONGEST prevn = 0;
 774   ULONGEST un;
 775
 776   int i = 0;
 777   int c;
 778   int base = input_radix;
 779   int unsigned_p = 0;
 780
 781   /* Number of "L" suffixes encountered.  */
 782   int long_p = 0;
 783
 784   /* We have found a "L" or "U" suffix.  */
 785   int found_suffix = 0;
 786
 787   ULONGEST high_bit;
 788   struct type *signed_type;
 789   struct type *unsigned_type;
 790
 791   if (parsed_float)
 792     {
 793       /* It's a float since it contains a point or an exponent.  */
 794       char c;
 795       int num = 0;      /* number of tokens scanned by scanf */
 796       char saved_char = p[len];
 797
 798       p[len] = 0;       /* null-terminate the token */
 799       num = sscanf (p, DOUBLEST_SCAN_FORMAT "%c",
 800                     &putithere->typed_val_float.dval, &c);
 801       p[len] = saved_char;      /* restore the input stream */
 802       if (num != 1)             /* check scanf found ONLY a float ... */
 803         return ERROR;
 804       /* See if it has `f' or `l' suffix (float or long double).  */
 805
 806       c = tolower (p[len - 1]);
 807
 808       if (c == 'f')
 809         putithere->typed_val_float.type = builtin_type_float;
 810       else if (c == 'l')
 811         putithere->typed_val_float.type = builtin_type_long_double;
 812       else if (isdigit (c) || c == '.')
 813         putithere->typed_val_float.type = builtin_type_double;
 814       else
 815         return ERROR;
 816
 817       return FLOAT;
 818     }
 819
 820   /* Handle base-switching prefixes 0x, 0t, 0d, 0 */
 821   if (p[0] == '0')
 822     switch (p[1])
 823       {
 824       case 'x':
 825       case 'X':
 826         if (len >= 3)
 827           {
 828             p += 2;
 829             base = 16;
 830             len -= 2;
 831           }
 832         break;
 833
 834       case 't':
 835       case 'T':
 836       case 'd':
 837       case 'D':
 838         if (len >= 3)
 839           {
 840             p += 2;
 841             base = 10;
 842             len -= 2;
 843           }
 844         break;
 845
 846       default:
 847         base = 8;
 848         break;
 849       }
 850
 851   while (len-- > 0)
 852     {
 853       c = *p++;
 854       if (c >= 'A' && c <= 'Z')
 855         c += 'a' - 'A';
 856       if (c != 'l' && c != 'u')
 857         n *= base;
 858       if (c >= '0' && c <= '9')
 859         {
 860           if (found_suffix)
 861             return ERROR;
 862           n += i = c - '0';
 863         }
 864       else
 865         {
 866           if (base > 10 && c >= 'a' && c <= 'f')
 867             {
 868               if (found_suffix)
 869                 return ERROR;
 870               n += i = c - 'a' + 10;
 871             }
 872           else if (c == 'l')
 873             {
 874               ++long_p;
 875               found_suffix = 1;
 876             }
 877           else if (c == 'u')
 878             {
 879               unsigned_p = 1;
 880               found_suffix = 1;
 881             }
 882           else
 883             return ERROR;       /* Char not a digit */
 884         }
 885       if (i >= base)
 886         return ERROR;           /* Invalid digit in this base */
 887
 888       /* Portably test for overflow (only works for nonzero values, so make
 889          a second check for zero).  FIXME: Can't we just make n and prevn
 890          unsigned and avoid this?  */
 891       if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
 892         unsigned_p = 1;         /* Try something unsigned */
 893
 894       /* Portably test for unsigned overflow.
 895          FIXME: This check is wrong; for example it doesn't find overflow
 896          on 0x123456789 when LONGEST is 32 bits.  */
 897       if (c != 'l' && c != 'u' && n != 0)
 898         {
 899           if ((unsigned_p && (ULONGEST) prevn >= (ULONGEST) n))
 900             error ("Numeric constant too large.");
 901         }
 902       prevn = n;
 903     }
 904
 905   /* An integer constant is an int, a long, or a long long.  An L
 906      suffix forces it to be long; an LL suffix forces it to be long
 907      long.  If not forced to a larger size, it gets the first type of
 908      the above that it fits in.  To figure out whether it fits, we
 909      shift it right and see whether anything remains.  Note that we
 910      can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
 911      operation, because many compilers will warn about such a shift
 912      (which always produces a zero result).  Sometimes TARGET_INT_BIT
 913      or TARGET_LONG_BIT will be that big, sometimes not.  To deal with
 914      the case where it is we just always shift the value more than
 915      once, with fewer bits each time.  */
 916
 917   un = (ULONGEST)n >> 2;
 918   if (long_p == 0
 919       && (un >> (TARGET_INT_BIT - 2)) == 0)
 920     {
 921       high_bit = ((ULONGEST)1) << (TARGET_INT_BIT-1);
 922
 923       /* A large decimal (not hex or octal) constant (between INT_MAX
 924          and UINT_MAX) is a long or unsigned long, according to ANSI,
 925          never an unsigned int, but this code treats it as unsigned
 926          int.  This probably should be fixed.  GCC gives a warning on
 927          such constants.  */
 928
 929       unsigned_type = builtin_type_unsigned_int;
 930       signed_type = builtin_type_int;
 931     }
 932   else if (long_p <= 1
 933            && (un >> (TARGET_LONG_BIT - 2)) == 0)
 934     {
 935       high_bit = ((ULONGEST)1) << (TARGET_LONG_BIT-1);
 936       unsigned_type = builtin_type_unsigned_long;
 937       signed_type = builtin_type_long;
 938     }
 939   else
 940     {
 941       int shift;
 942       if (sizeof (ULONGEST) * HOST_CHAR_BIT < TARGET_LONG_LONG_BIT)
 943         /* A long long does not fit in a LONGEST.  */
 944         shift = (sizeof (ULONGEST) * HOST_CHAR_BIT - 1);
 945       else
 946         shift = (TARGET_LONG_LONG_BIT - 1);
 947       high_bit = (ULONGEST) 1 << shift;
 948       unsigned_type = builtin_type_unsigned_long_long;
 949       signed_type = builtin_type_long_long;
 950     }
 951
 952    putithere->typed_val_int.val = n;
 953
 954    /* If the high bit of the worked out type is set then this number
 955       has to be unsigned. */
 956
 957    if (unsigned_p || (n & high_bit))
 958      {
 959        putithere->typed_val_int.type = unsigned_type;
 960      }
 961    else
 962      {
 963        putithere->typed_val_int.type = signed_type;
 964      }
 965
 966    return INT;
 967 }
 968
 969
 970 struct type_push
 971 {
 972   struct type *stored;
 973   struct type_push *next;
 974 };
 975
 976 static struct type_push *tp_top = NULL;
 977
 978 static void
 979 push_current_type (void)
 980 {
 981   struct type_push *tpnew;
 982   tpnew = (struct type_push *) malloc (sizeof (struct type_push));
 983   tpnew->next = tp_top;
 984   tpnew->stored = current_type;
 985   current_type = NULL;
 986   tp_top = tpnew;
 987 }
 988
 989 static void
 990 pop_current_type (void)
 991 {
 992   struct type_push *tp = tp_top;
 993   if (tp)
 994     {
 995       current_type = tp->stored;
 996       tp_top = tp->next;
 997       xfree (tp);
 998     }
 999 }
1000
1001 struct token
1002 {
1003   char *operator;
1004   int token;
1005   enum exp_opcode opcode;
1006 };
1007
1008 static const struct token tokentab3[] =
1009   {
1010     {"shr", RSH, BINOP_END},
1011     {"shl", LSH, BINOP_END},
1012     {"and", ANDAND, BINOP_END},
1013     {"div", DIV, BINOP_END},
1014     {"not", NOT, BINOP_END},
1015     {"mod", MOD, BINOP_END},
1016     {"inc", INCREMENT, BINOP_END},
1017     {"dec", DECREMENT, BINOP_END},
1018     {"xor", XOR, BINOP_END}
1019   };
1020
1021 static const struct token tokentab2[] =
1022   {
1023     {"or", OR, BINOP_END},
1024     {"<>", NOTEQUAL, BINOP_END},
1025     {"<=", LEQ, BINOP_END},
1026     {">=", GEQ, BINOP_END},
1027     {":=", ASSIGN, BINOP_END},
1028     {"::", COLONCOLON, BINOP_END} };
1029
1030 /* Allocate uppercased var */
1031 /* make an uppercased copy of tokstart */
1032 static char * uptok (tokstart, namelen)
1033   char *tokstart;
1034   int namelen;
1035 {
1036   int i;
1037   char *uptokstart = (char *)malloc(namelen+1);
1038   for (i = 0;i <= namelen;i++)
1039     {
1040       if ((tokstart[i]>='a' && tokstart[i]<='z'))
1041         uptokstart[i] = tokstart[i]-('a'-'A');
1042       else
1043         uptokstart[i] = tokstart[i];
1044     }
1045   uptokstart[namelen]='\0';
1046   return uptokstart;
1047 }
1048 /* Read one token, getting characters through lexptr.  */
1049
1050
1051 static int
1052 yylex ()
1053 {
1054   int c;
1055   int namelen;
1056   unsigned int i;
1057   char *tokstart;
1058   char *uptokstart;
1059   char *tokptr;
1060   char *p;
1061   int explen, tempbufindex;
1062   static char *tempbuf;
1063   static int tempbufsize;
1064
1065  retry:
1066
1067   prev_lexptr = lexptr;
1068
1069   tokstart = lexptr;
1070   explen = strlen (lexptr);
1071   /* See if it is a special token of length 3.  */
1072   if (explen > 2)
1073     for (i = 0; i < sizeof (tokentab3) / sizeof (tokentab3[0]); i++)
1074       if (strncasecmp (tokstart, tokentab3[i].operator, 3) == 0
1075           && (!isalpha (tokentab3[i].operator[0]) || explen == 3
1076               || (!isalpha (tokstart[3]) && !isdigit (tokstart[3]) && tokstart[3] != '_')))
1077         {
1078           lexptr += 3;
1079           yylval.opcode = tokentab3[i].opcode;
1080           return tokentab3[i].token;
1081         }
1082
1083   /* See if it is a special token of length 2.  */
1084   if (explen > 1)
1085   for (i = 0; i < sizeof (tokentab2) / sizeof (tokentab2[0]); i++)
1086       if (strncasecmp (tokstart, tokentab2[i].operator, 2) == 0
1087           && (!isalpha (tokentab2[i].operator[0]) || explen == 2
1088               || (!isalpha (tokstart[2]) && !isdigit (tokstart[2]) && tokstart[2] != '_')))
1089         {
1090           lexptr += 2;
1091           yylval.opcode = tokentab2[i].opcode;
1092           return tokentab2[i].token;
1093         }
1094
1095   switch (c = *tokstart)
1096     {
1097     case 0:
1098       return 0;
1099
1100     case ' ':
1101     case '\t':
1102     case '\n':
1103       lexptr++;
1104       goto retry;
1105
1106     case '\'':
1107       /* We either have a character constant ('0' or '\177' for example)
1108          or we have a quoted symbol reference ('foo(int,int)' in object pascal
1109          for example). */
1110       lexptr++;
1111       c = *lexptr++;
1112       if (c == '\\')
1113         c = parse_escape (&lexptr);
1114       else if (c == '\'')
1115         error ("Empty character constant.");
1116
1117       yylval.typed_val_int.val = c;
1118       yylval.typed_val_int.type = builtin_type_char;
1119
1120       c = *lexptr++;
1121       if (c != '\'')
1122         {
1123           namelen = skip_quoted (tokstart) - tokstart;
1124           if (namelen > 2)
1125             {
1126               lexptr = tokstart + namelen;
1127               if (lexptr[-1] != '\'')
1128                 error ("Unmatched single quote.");
1129               namelen -= 2;
1130               tokstart++;
1131               uptokstart = uptok(tokstart,namelen);
1132               goto tryname;
1133             }
1134           error ("Invalid character constant.");
1135         }
1136       return INT;
1137
1138     case '(':
1139       paren_depth++;
1140       lexptr++;
1141       return c;
1142
1143     case ')':
1144       if (paren_depth == 0)
1145         return 0;
1146       paren_depth--;
1147       lexptr++;
1148       return c;
1149
1150     case ',':
1151       if (comma_terminates && paren_depth == 0)
1152         return 0;
1153       lexptr++;
1154       return c;
1155
1156     case '.':
1157       /* Might be a floating point number.  */
1158       if (lexptr[1] < '0' || lexptr[1] > '9')
1159         goto symbol;            /* Nope, must be a symbol. */
1160       /* FALL THRU into number case.  */
1161
1162     case '0':
1163     case '1':
1164     case '2':
1165     case '3':
1166     case '4':
1167     case '5':
1168     case '6':
1169     case '7':
1170     case '8':
1171     case '9':
1172       {
1173         /* It's a number.  */
1174         int got_dot = 0, got_e = 0, toktype;
1175         char *p = tokstart;
1176         int hex = input_radix > 10;
1177
1178         if (c == '0' && (p[1] == 'x' || p[1] == 'X'))
1179           {
1180             p += 2;
1181             hex = 1;
1182           }
1183         else if (c == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1184           {
1185             p += 2;
1186             hex = 0;
1187           }
1188
1189         for (;; ++p)
1190           {
1191             /* This test includes !hex because 'e' is a valid hex digit
1192                and thus does not indicate a floating point number when
1193                the radix is hex.  */
1194             if (!hex && !got_e && (*p == 'e' || *p == 'E'))
1195               got_dot = got_e = 1;
1196             /* This test does not include !hex, because a '.' always indicates
1197                a decimal floating point number regardless of the radix.  */
1198             else if (!got_dot && *p == '.')
1199               got_dot = 1;
1200             else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
1201                      && (*p == '-' || *p == '+'))
1202               /* This is the sign of the exponent, not the end of the
1203                  number.  */
1204               continue;
1205             /* We will take any letters or digits.  parse_number will
1206                complain if past the radix, or if L or U are not final.  */
1207             else if ((*p < '0' || *p > '9')
1208                      && ((*p < 'a' || *p > 'z')
1209                                   && (*p < 'A' || *p > 'Z')))
1210               break;
1211           }
1212         toktype = parse_number (tokstart, p - tokstart, got_dot|got_e, &yylval);
1213         if (toktype == ERROR)
1214           {
1215             char *err_copy = (char *) alloca (p - tokstart + 1);
1216
1217             memcpy (err_copy, tokstart, p - tokstart);
1218             err_copy[p - tokstart] = 0;
1219             error ("Invalid number \"%s\".", err_copy);
1220           }
1221         lexptr = p;
1222         return toktype;
1223       }
1224
1225     case '+':
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     symbol:
1245       lexptr++;
1246       return c;
1247
1248     case '"':
1249
1250       /* Build the gdb internal form of the input string in tempbuf,
1251          translating any standard C escape forms seen.  Note that the
1252          buffer is null byte terminated *only* for the convenience of
1253          debugging gdb itself and printing the buffer contents when
1254          the buffer contains no embedded nulls.  Gdb does not depend
1255          upon the buffer being null byte terminated, it uses the length
1256          string instead.  This allows gdb to handle C strings (as well
1257          as strings in other languages) with embedded null bytes */
1258
1259       tokptr = ++tokstart;
1260       tempbufindex = 0;
1261
1262       do {
1263         /* Grow the static temp buffer if necessary, including allocating
1264            the first one on demand. */
1265         if (tempbufindex + 1 >= tempbufsize)
1266           {
1267             tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1268           }
1269
1270         switch (*tokptr)
1271           {
1272           case '\0':
1273           case '"':
1274             /* Do nothing, loop will terminate. */
1275             break;
1276           case '\\':
1277             tokptr++;
1278             c = parse_escape (&tokptr);
1279             if (c == -1)
1280               {
1281                 continue;
1282               }
1283             tempbuf[tempbufindex++] = c;
1284             break;
1285           default:
1286             tempbuf[tempbufindex++] = *tokptr++;
1287             break;
1288           }
1289       } while ((*tokptr != '"') && (*tokptr != '\0'));
1290       if (*tokptr++ != '"')
1291         {
1292           error ("Unterminated string in expression.");
1293         }
1294       tempbuf[tempbufindex] = '\0';     /* See note above */
1295       yylval.sval.ptr = tempbuf;
1296       yylval.sval.length = tempbufindex;
1297       lexptr = tokptr;
1298       return (STRING);
1299     }
1300
1301   if (!(c == '_' || c == '$'
1302         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
1303     /* We must have come across a bad character (e.g. ';').  */
1304     error ("Invalid character '%c' in expression.", c);
1305
1306   /* It's a name.  See how long it is.  */
1307   namelen = 0;
1308   for (c = tokstart[namelen];
1309        (c == '_' || c == '$' || (c >= '0' && c <= '9')
1310         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1311     {
1312       /* Template parameter lists are part of the name.
1313          FIXME: This mishandles `print $a<4&&$a>3'.  */
1314       if (c == '<')
1315         {
1316           int i = namelen;
1317           int nesting_level = 1;
1318           while (tokstart[++i])
1319             {
1320               if (tokstart[i] == '<')
1321                 nesting_level++;
1322               else if (tokstart[i] == '>')
1323                 {
1324                   if (--nesting_level == 0)
1325                     break;
1326                 }
1327             }
1328           if (tokstart[i] == '>')
1329             namelen = i;
1330           else
1331             break;
1332         }
1333
1334       /* do NOT uppercase internals because of registers !!! */
1335       c = tokstart[++namelen];
1336     }
1337
1338   uptokstart = uptok(tokstart,namelen);
1339
1340   /* The token "if" terminates the expression and is NOT
1341      removed from the input stream.  */
1342   if (namelen == 2 && uptokstart[0] == 'I' && uptokstart[1] == 'F')
1343     {
1344       return 0;
1345     }
1346
1347   lexptr += namelen;
1348
1349   tryname:
1350
1351   /* Catch specific keywords.  Should be done with a data structure.  */
1352   switch (namelen)
1353     {
1354     case 6:
1355       if (DEPRECATED_STREQ (uptokstart, "OBJECT"))
1356         return CLASS;
1357       if (DEPRECATED_STREQ (uptokstart, "RECORD"))
1358         return STRUCT;
1359       if (DEPRECATED_STREQ (uptokstart, "SIZEOF"))
1360         return SIZEOF;
1361       break;
1362     case 5:
1363       if (DEPRECATED_STREQ (uptokstart, "CLASS"))
1364         return CLASS;
1365       if (DEPRECATED_STREQ (uptokstart, "FALSE"))
1366         {
1367           yylval.lval = 0;
1368           return FALSEKEYWORD;
1369         }
1370       break;
1371     case 4:
1372       if (DEPRECATED_STREQ (uptokstart, "TRUE"))
1373         {
1374           yylval.lval = 1;
1375           return TRUEKEYWORD;
1376         }
1377       if (DEPRECATED_STREQ (uptokstart, "SELF"))
1378         {
1379           /* here we search for 'this' like
1380              inserted in FPC stabs debug info */
1381           static const char this_name[] = "this";
1382
1383           if (lookup_symbol (this_name, expression_context_block,
1384                              VAR_DOMAIN, (int *) NULL,
1385                              (struct symtab **) NULL))
1386             return THIS;
1387         }
1388       break;
1389     default:
1390       break;
1391     }
1392
1393   yylval.sval.ptr = tokstart;
1394   yylval.sval.length = namelen;
1395
1396   if (*tokstart == '$')
1397     {
1398       /* $ is the normal prefix for pascal hexadecimal values
1399         but this conflicts with the GDB use for debugger variables
1400         so in expression to enter hexadecimal values
1401         we still need to use C syntax with 0xff  */
1402       write_dollar_variable (yylval.sval);
1403       return VARIABLE;
1404     }
1405
1406   /* Use token-type BLOCKNAME for symbols that happen to be defined as
1407      functions or symtabs.  If this is not so, then ...
1408      Use token-type TYPENAME for symbols that happen to be defined
1409      currently as names of types; NAME for other symbols.
1410      The caller is not constrained to care about the distinction.  */
1411   {
1412     char *tmp = copy_name (yylval.sval);
1413     struct symbol *sym;
1414     int is_a_field_of_this = 0;
1415     int is_a_field = 0;
1416     int hextype;
1417
1418
1419     if (search_field && current_type)
1420       is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1421     if (is_a_field)
1422       sym = NULL;
1423     else
1424       sym = lookup_symbol (tmp, expression_context_block,
1425                            VAR_DOMAIN,
1426                            &is_a_field_of_this,
1427                            (struct symtab **) NULL);
1428     /* second chance uppercased (as Free Pascal does).  */
1429     if (!sym && !is_a_field_of_this && !is_a_field)
1430       {
1431        for (i = 0; i <= namelen; i++)
1432          {
1433            if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1434              tmp[i] -= ('a'-'A');
1435          }
1436        if (search_field && current_type)
1437          is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1438        if (is_a_field)
1439          sym = NULL;
1440        else
1441          sym = lookup_symbol (tmp, expression_context_block,
1442                         VAR_DOMAIN,
1443                         &is_a_field_of_this,
1444                         (struct symtab **) NULL);
1445        if (sym || is_a_field_of_this || is_a_field)
1446          for (i = 0; i <= namelen; i++)
1447            {
1448              if ((tokstart[i] >= 'a' && tokstart[i] <= 'z'))
1449                tokstart[i] -= ('a'-'A');
1450            }
1451       }
1452     /* Third chance Capitalized (as GPC does).  */
1453     if (!sym && !is_a_field_of_this && !is_a_field)
1454       {
1455        for (i = 0; i <= namelen; i++)
1456          {
1457            if (i == 0)
1458              {
1459               if ((tmp[i] >= 'a' && tmp[i] <= 'z'))
1460                 tmp[i] -= ('a'-'A');
1461              }
1462            else
1463            if ((tmp[i] >= 'A' && tmp[i] <= 'Z'))
1464              tmp[i] -= ('A'-'a');
1465           }
1466        if (search_field && current_type)
1467          is_a_field = (lookup_struct_elt_type (current_type, tmp, 1) != NULL);
1468        if (is_a_field)
1469          sym = NULL;
1470        else
1471          sym = lookup_symbol (tmp, expression_context_block,
1472                          VAR_DOMAIN,
1473                          &is_a_field_of_this,
1474                          (struct symtab **) NULL);
1475        if (sym || is_a_field_of_this || is_a_field)
1476           for (i = 0; i <= namelen; i++)
1477             {
1478               if (i == 0)
1479                 {
1480                   if ((tokstart[i] >= 'a' && tokstart[i] <= 'z'))
1481                     tokstart[i] -= ('a'-'A');
1482                 }
1483               else
1484                 if ((tokstart[i] >= 'A' && tokstart[i] <= 'Z'))
1485                   tokstart[i] -= ('A'-'a');
1486             }
1487       }
1488
1489     if (is_a_field)
1490       {
1491         tempbuf = (char *) realloc (tempbuf, namelen + 1);
1492         strncpy (tempbuf, tokstart, namelen); tempbuf [namelen] = 0;
1493         yylval.sval.ptr = tempbuf;
1494         yylval.sval.length = namelen;
1495         return FIELDNAME;
1496       }
1497     /* Call lookup_symtab, not lookup_partial_symtab, in case there are
1498        no psymtabs (coff, xcoff, or some future change to blow away the
1499        psymtabs once once symbols are read).  */
1500     if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK) ||
1501         lookup_symtab (tmp))
1502       {
1503         yylval.ssym.sym = sym;
1504         yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1505         return BLOCKNAME;
1506       }
1507     if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1508         {
1509 #if 1
1510           /* Despite the following flaw, we need to keep this code enabled.
1511              Because we can get called from check_stub_method, if we don't
1512              handle nested types then it screws many operations in any
1513              program which uses nested types.  */
1514           /* In "A::x", if x is a member function of A and there happens
1515              to be a type (nested or not, since the stabs don't make that
1516              distinction) named x, then this code incorrectly thinks we
1517              are dealing with nested types rather than a member function.  */
1518
1519           char *p;
1520           char *namestart;
1521           struct symbol *best_sym;
1522
1523           /* Look ahead to detect nested types.  This probably should be
1524              done in the grammar, but trying seemed to introduce a lot
1525              of shift/reduce and reduce/reduce conflicts.  It's possible
1526              that it could be done, though.  Or perhaps a non-grammar, but
1527              less ad hoc, approach would work well.  */
1528
1529           /* Since we do not currently have any way of distinguishing
1530              a nested type from a non-nested one (the stabs don't tell
1531              us whether a type is nested), we just ignore the
1532              containing type.  */
1533
1534           p = lexptr;
1535           best_sym = sym;
1536           while (1)
1537             {
1538               /* Skip whitespace.  */
1539               while (*p == ' ' || *p == '\t' || *p == '\n')
1540                 ++p;
1541               if (*p == ':' && p[1] == ':')
1542                 {
1543                   /* Skip the `::'.  */
1544                   p += 2;
1545                   /* Skip whitespace.  */
1546                   while (*p == ' ' || *p == '\t' || *p == '\n')
1547                     ++p;
1548                   namestart = p;
1549                   while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1550                          || (*p >= 'a' && *p <= 'z')
1551                          || (*p >= 'A' && *p <= 'Z'))
1552                     ++p;
1553                   if (p != namestart)
1554                     {
1555                       struct symbol *cur_sym;
1556                       /* As big as the whole rest of the expression, which is
1557                          at least big enough.  */
1558                       char *ncopy = alloca (strlen (tmp)+strlen (namestart)+3);
1559                       char *tmp1;
1560
1561                       tmp1 = ncopy;
1562                       memcpy (tmp1, tmp, strlen (tmp));
1563                       tmp1 += strlen (tmp);
1564                       memcpy (tmp1, "::", 2);
1565                       tmp1 += 2;
1566                       memcpy (tmp1, namestart, p - namestart);
1567                       tmp1[p - namestart] = '\0';
1568                       cur_sym = lookup_symbol (ncopy, expression_context_block,
1569                                                VAR_DOMAIN, (int *) NULL,
1570                                                (struct symtab **) NULL);
1571                       if (cur_sym)
1572                         {
1573                           if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1574                             {
1575                               best_sym = cur_sym;
1576                               lexptr = p;
1577                             }
1578                           else
1579                             break;
1580                         }
1581                       else
1582                         break;
1583                     }
1584                   else
1585                     break;
1586                 }
1587               else
1588                 break;
1589             }
1590
1591           yylval.tsym.type = SYMBOL_TYPE (best_sym);
1592 #else /* not 0 */
1593           yylval.tsym.type = SYMBOL_TYPE (sym);
1594 #endif /* not 0 */
1595           return TYPENAME;
1596         }
1597     yylval.tsym.type
1598       = language_lookup_primitive_type_by_name (current_language,
1599                                                 current_gdbarch, tmp);
1600     if (yylval.tsym.type != NULL)
1601       return TYPENAME;
1602
1603     /* Input names that aren't symbols but ARE valid hex numbers,
1604        when the input radix permits them, can be names or numbers
1605        depending on the parse.  Note we support radixes > 16 here.  */
1606     if (!sym &&
1607         ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1608          (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1609       {
1610         YYSTYPE newlval;        /* Its value is ignored.  */
1611         hextype = parse_number (tokstart, namelen, 0, &newlval);
1612         if (hextype == INT)
1613           {
1614             yylval.ssym.sym = sym;
1615             yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1616             return NAME_OR_INT;
1617           }
1618       }
1619
1620     free(uptokstart);
1621     /* Any other kind of symbol */
1622     yylval.ssym.sym = sym;
1623     yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1624     return NAME;
1625   }
1626 }
1627
1628 void
1629 yyerror (msg)
1630      char *msg;
1631 {
1632   if (prev_lexptr)
1633     lexptr = prev_lexptr;
1634
1635   error ("A %s in expression, near `%s'.", (msg ? msg : "error"), lexptr);
1636 }