gdb/c-exp.y

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