gdb/objc-exp.y

   1 /* YACC parser for C expressions, for GDB.
   2
   3    Copyright (C) 1986, 1989, 1990, 1991, 1993, 1994, 2002, 2006, 2007, 2008
   4    Free Software Foundation, Inc.
   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 /* Parse a C expression from text in a string, and return the result
  22    as a struct expression pointer.  That structure contains arithmetic
  23    operations in reverse polish, with constants represented by
  24    operations that are followed by special data.  See expression.h for
  25    the details of the format.  What is important here is that it can
  26    be built up sequentially during the process of parsing; the lower
  27    levels of the tree always 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
  32    parser generator.  Doing this with #defines and trying to control
  33    the interaction with include files (<malloc.h> and <stdlib.h> for
  34    example) just became too messy, particularly when such includes can
  35    be inserted at random times by the parser generator.  */
  36
  37 %{
  38
  39 #include "defs.h"
  40 #include "gdb_string.h"
  41 #include <ctype.h>
  42 #include "expression.h"
  43
  44 #include "objc-lang.h"  /* For objc language constructs.  */
  45
  46 #include "value.h"
  47 #include "parser-defs.h"
  48 #include "language.h"
  49 #include "c-lang.h"
  50 #include "bfd.h" /* Required by objfiles.h.  */
  51 #include "symfile.h" /* Required by objfiles.h.  */
  52 #include "objfiles.h" /* For have_full_symbols and have_partial_symbols.  */
  53 #include "top.h"
  54 #include "completer.h" /* For skip_quoted().  */
  55 #include "block.h"
  56
  57 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
  58    etc), as well as gratuitiously global symbol names, so we can have
  59    multiple yacc generated parsers in gdb.  Note that these are only
  60    the variables produced by yacc.  If other parser generators (bison,
  61    byacc, etc) produce additional global names that conflict at link
  62    time, then those parser generators need to be fixed instead of
  63    adding those names to this list.  */
  64
  65 #define yymaxdepth      objc_maxdepth
  66 #define yyparse         objc_parse
  67 #define yylex           objc_lex
  68 #define yyerror         objc_error
  69 #define yylval          objc_lval
  70 #define yychar          objc_char
  71 #define yydebug         objc_debug
  72 #define yypact          objc_pact
  73 #define yyr1            objc_r1
  74 #define yyr2            objc_r2
  75 #define yydef           objc_def
  76 #define yychk           objc_chk
  77 #define yypgo           objc_pgo
  78 #define yyact           objc_act
  79 #define yyexca          objc_exca
  80 #define yyerrflag       objc_errflag
  81 #define yynerrs         objc_nerrs
  82 #define yyps            objc_ps
  83 #define yypv            objc_pv
  84 #define yys             objc_s
  85 #define yy_yys          objc_yys
  86 #define yystate         objc_state
  87 #define yytmp           objc_tmp
  88 #define yyv             objc_v
  89 #define yy_yyv          objc_yyv
  90 #define yyval           objc_val
  91 #define yylloc          objc_lloc
  92 #define yyreds          objc_reds               /* With YYDEBUG defined */
  93 #define yytoks          objc_toks               /* With YYDEBUG defined */
  94 #define yyname          objc_name               /* With YYDEBUG defined */
  95 #define yyrule          objc_rule               /* With YYDEBUG defined */
  96 #define yylhs           objc_yylhs
  97 #define yylen           objc_yylen
  98 #define yydefred        objc_yydefred
  99 #define yydgoto         objc_yydgoto
 100 #define yysindex        objc_yysindex
 101 #define yyrindex        objc_yyrindex
 102 #define yygindex        objc_yygindex
 103 #define yytable         objc_yytable
 104 #define yycheck         objc_yycheck
 105
 106 #ifndef YYDEBUG
 107 #define YYDEBUG 0               /* Default to no yydebug support.  */
 108 #endif
 109
 110 int
 111 yyparse (void);
 112
 113 static int
 114 yylex (void);
 115
 116 void
 117 yyerror (char *);
 118
 119 %}
 120
 121 /* Although the yacc "value" of an expression is not used,
 122    since the result is stored in the structure being created,
 123    other node types do have values.  */
 124
 125 %union
 126   {
 127     LONGEST lval;
 128     struct {
 129       LONGEST val;
 130       struct type *type;
 131     } typed_val_int;
 132     struct {
 133       DOUBLEST dval;
 134       struct type *type;
 135     } typed_val_float;
 136     struct symbol *sym;
 137     struct type *tval;
 138     struct stoken sval;
 139     struct ttype tsym;
 140     struct symtoken ssym;
 141     int voidval;
 142     struct block *bval;
 143     enum exp_opcode opcode;
 144     struct internalvar *ivar;
 145     struct objc_class_str class;
 146
 147     struct type **tvec;
 148     int *ivec;
 149   }
 150
 151 %{
 152 /* YYSTYPE gets defined by %union.  */
 153 static int
 154 parse_number (char *, int, int, YYSTYPE *);
 155 %}
 156
 157 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
 158 %type <lval> rcurly
 159 %type <tval> type typebase
 160 %type <tvec> nonempty_typelist
 161 /* %type <bval> block */
 162
 163 /* Fancy type parsing.  */
 164 %type <voidval> func_mod direct_abs_decl abs_decl
 165 %type <tval> ptype
 166 %type <lval> array_mod
 167
 168 %token <typed_val_int> INT
 169 %token <typed_val_float> FLOAT
 170
 171 /* Both NAME and TYPENAME tokens represent symbols in the input, and
 172    both convey their data as strings.  But a TYPENAME is a string that
 173    happens to be defined as a typedef or builtin type name (such as
 174    int or char) and a NAME is any other symbol.  Contexts where this
 175    distinction is not important can use the nonterminal "name", which
 176    matches either NAME or TYPENAME.  */
 177
 178 %token <sval> STRING
 179 %token <sval> NSSTRING          /* ObjC Foundation "NSString" literal */
 180 %token <sval> SELECTOR          /* ObjC "@selector" pseudo-operator   */
 181 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
 182 %token <tsym> TYPENAME
 183 %token <class> CLASSNAME        /* ObjC Class name */
 184 %type <sval> name
 185 %type <ssym> name_not_typename
 186 %type <tsym> typename
 187
 188 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
 189    but which would parse as a valid number in the current input radix.
 190    E.g. "c" when input_radix==16.  Depending on the parse, it will be
 191    turned into a name or into a number.  */
 192
 193 %token <ssym> NAME_OR_INT
 194
 195 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
 196 %token TEMPLATE
 197 %token ERROR
 198
 199 /* Special type cases, put in to allow the parser to distinguish
 200    different legal basetypes.  */
 201 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
 202
 203 %token <voidval> VARIABLE
 204
 205 %token <opcode> ASSIGN_MODIFY
 206
 207 %left ','
 208 %left ABOVE_COMMA
 209 %right '=' ASSIGN_MODIFY
 210 %right '?'
 211 %left OROR
 212 %left ANDAND
 213 %left '|'
 214 %left '^'
 215 %left '&'
 216 %left EQUAL NOTEQUAL
 217 %left '<' '>' LEQ GEQ
 218 %left LSH RSH
 219 %left '@'
 220 %left '+' '-'
 221 %left '*' '/' '%'
 222 %right UNARY INCREMENT DECREMENT
 223 %right ARROW '.' '[' '('
 224 %token <ssym> BLOCKNAME
 225 %type <bval> block
 226 %left COLONCOLON
 227
 228 \f
 229 %%
 230
 231 start   :       exp1
 232         |       type_exp
 233         ;
 234
 235 type_exp:       type
 236                         { write_exp_elt_opcode(OP_TYPE);
 237                           write_exp_elt_type($1);
 238                           write_exp_elt_opcode(OP_TYPE);}
 239         ;
 240
 241 /* Expressions, including the comma operator.  */
 242 exp1    :       exp
 243         |       exp1 ',' exp
 244                         { write_exp_elt_opcode (BINOP_COMMA); }
 245         ;
 246
 247 /* Expressions, not including the comma operator.  */
 248 exp     :       '*' exp    %prec UNARY
 249                         { write_exp_elt_opcode (UNOP_IND); }
 250         ;
 251
 252 exp     :       '&' exp    %prec UNARY
 253                         { write_exp_elt_opcode (UNOP_ADDR); }
 254         ;
 255
 256 exp     :       '-' exp    %prec UNARY
 257                         { write_exp_elt_opcode (UNOP_NEG); }
 258         ;
 259
 260 exp     :       '!' exp    %prec UNARY
 261                         { write_exp_elt_opcode (UNOP_LOGICAL_NOT); }
 262         ;
 263
 264 exp     :       '~' exp    %prec UNARY
 265                         { write_exp_elt_opcode (UNOP_COMPLEMENT); }
 266         ;
 267
 268 exp     :       INCREMENT exp    %prec UNARY
 269                         { write_exp_elt_opcode (UNOP_PREINCREMENT); }
 270         ;
 271
 272 exp     :       DECREMENT exp    %prec UNARY
 273                         { write_exp_elt_opcode (UNOP_PREDECREMENT); }
 274         ;
 275
 276 exp     :       exp INCREMENT    %prec UNARY
 277                         { write_exp_elt_opcode (UNOP_POSTINCREMENT); }
 278         ;
 279
 280 exp     :       exp DECREMENT    %prec UNARY
 281                         { write_exp_elt_opcode (UNOP_POSTDECREMENT); }
 282         ;
 283
 284 exp     :       SIZEOF exp       %prec UNARY
 285                         { write_exp_elt_opcode (UNOP_SIZEOF); }
 286         ;
 287
 288 exp     :       exp ARROW name
 289                         { write_exp_elt_opcode (STRUCTOP_PTR);
 290                           write_exp_string ($3);
 291                           write_exp_elt_opcode (STRUCTOP_PTR); }
 292         ;
 293
 294 exp     :       exp ARROW qualified_name
 295                         { /* exp->type::name becomes exp->*(&type::name) */
 296                           /* Note: this doesn't work if name is a
 297                              static member!  FIXME */
 298                           write_exp_elt_opcode (UNOP_ADDR);
 299                           write_exp_elt_opcode (STRUCTOP_MPTR); }
 300         ;
 301 exp     :       exp ARROW '*' exp
 302                         { write_exp_elt_opcode (STRUCTOP_MPTR); }
 303         ;
 304
 305 exp     :       exp '.' name
 306                         { write_exp_elt_opcode (STRUCTOP_STRUCT);
 307                           write_exp_string ($3);
 308                           write_exp_elt_opcode (STRUCTOP_STRUCT); }
 309         ;
 310
 311
 312 exp     :       exp '.' qualified_name
 313                         { /* exp.type::name becomes exp.*(&type::name) */
 314                           /* Note: this doesn't work if name is a
 315                              static member!  FIXME */
 316                           write_exp_elt_opcode (UNOP_ADDR);
 317                           write_exp_elt_opcode (STRUCTOP_MEMBER); }
 318         ;
 319
 320 exp     :       exp '.' '*' exp
 321                         { write_exp_elt_opcode (STRUCTOP_MEMBER); }
 322         ;
 323
 324 exp     :       exp '[' exp1 ']'
 325                         { write_exp_elt_opcode (BINOP_SUBSCRIPT); }
 326         ;
 327 /*
 328  * The rules below parse ObjC message calls of the form:
 329  *      '[' target selector {':' argument}* ']'
 330  */
 331
 332 exp     :       '[' TYPENAME
 333                         {
 334                           CORE_ADDR class;
 335
 336                           class = lookup_objc_class (copy_name ($2.stoken));
 337                           if (class == 0)
 338                             error ("%s is not an ObjC Class",
 339                                    copy_name ($2.stoken));
 340                           write_exp_elt_opcode (OP_LONG);
 341                           write_exp_elt_type (builtin_type_int);
 342                           write_exp_elt_longcst ((LONGEST) class);
 343                           write_exp_elt_opcode (OP_LONG);
 344                           start_msglist();
 345                         }
 346                 msglist ']'
 347                         { write_exp_elt_opcode (OP_OBJC_MSGCALL);
 348                           end_msglist();
 349                           write_exp_elt_opcode (OP_OBJC_MSGCALL);
 350                         }
 351         ;
 352
 353 exp     :       '[' CLASSNAME
 354                         {
 355                           write_exp_elt_opcode (OP_LONG);
 356                           write_exp_elt_type (builtin_type_int);
 357                           write_exp_elt_longcst ((LONGEST) $2.class);
 358                           write_exp_elt_opcode (OP_LONG);
 359                           start_msglist();
 360                         }
 361                 msglist ']'
 362                         { write_exp_elt_opcode (OP_OBJC_MSGCALL);
 363                           end_msglist();
 364                           write_exp_elt_opcode (OP_OBJC_MSGCALL);
 365                         }
 366         ;
 367
 368 exp     :       '[' exp
 369                         { start_msglist(); }
 370                 msglist ']'
 371                         { write_exp_elt_opcode (OP_OBJC_MSGCALL);
 372                           end_msglist();
 373                           write_exp_elt_opcode (OP_OBJC_MSGCALL);
 374                         }
 375         ;
 376
 377 msglist :       name
 378                         { add_msglist(&$1, 0); }
 379         |       msgarglist
 380         ;
 381
 382 msgarglist :    msgarg
 383         |       msgarglist msgarg
 384         ;
 385
 386 msgarg  :       name ':' exp
 387                         { add_msglist(&$1, 1); }
 388         |       ':' exp /* Unnamed arg.  */
 389                         { add_msglist(0, 1);   }
 390         |       ',' exp /* Variable number of args.  */
 391                         { add_msglist(0, 0);   }
 392         ;
 393
 394 exp     :       exp '('
 395                         /* This is to save the value of arglist_len
 396                            being accumulated by an outer function call.  */
 397                         { start_arglist (); }
 398                 arglist ')'     %prec ARROW
 399                         { write_exp_elt_opcode (OP_FUNCALL);
 400                           write_exp_elt_longcst ((LONGEST) end_arglist ());
 401                           write_exp_elt_opcode (OP_FUNCALL); }
 402         ;
 403
 404 lcurly  :       '{'
 405                         { start_arglist (); }
 406         ;
 407
 408 arglist :
 409         ;
 410
 411 arglist :       exp
 412                         { arglist_len = 1; }
 413         ;
 414
 415 arglist :       arglist ',' exp   %prec ABOVE_COMMA
 416                         { arglist_len++; }
 417         ;
 418
 419 rcurly  :       '}'
 420                         { $$ = end_arglist () - 1; }
 421         ;
 422 exp     :       lcurly arglist rcurly   %prec ARROW
 423                         { write_exp_elt_opcode (OP_ARRAY);
 424                           write_exp_elt_longcst ((LONGEST) 0);
 425                           write_exp_elt_longcst ((LONGEST) $3);
 426                           write_exp_elt_opcode (OP_ARRAY); }
 427         ;
 428
 429 exp     :       lcurly type rcurly exp  %prec UNARY
 430                         { write_exp_elt_opcode (UNOP_MEMVAL);
 431                           write_exp_elt_type ($2);
 432                           write_exp_elt_opcode (UNOP_MEMVAL); }
 433         ;
 434
 435 exp     :       '(' type ')' exp  %prec UNARY
 436                         { write_exp_elt_opcode (UNOP_CAST);
 437                           write_exp_elt_type ($2);
 438                           write_exp_elt_opcode (UNOP_CAST); }
 439         ;
 440
 441 exp     :       '(' exp1 ')'
 442                         { }
 443         ;
 444
 445 /* Binary operators in order of decreasing precedence.  */
 446
 447 exp     :       exp '@' exp
 448                         { write_exp_elt_opcode (BINOP_REPEAT); }
 449         ;
 450
 451 exp     :       exp '*' exp
 452                         { write_exp_elt_opcode (BINOP_MUL); }
 453         ;
 454
 455 exp     :       exp '/' exp
 456                         { write_exp_elt_opcode (BINOP_DIV); }
 457         ;
 458
 459 exp     :       exp '%' exp
 460                         { write_exp_elt_opcode (BINOP_REM); }
 461         ;
 462
 463 exp     :       exp '+' exp
 464                         { write_exp_elt_opcode (BINOP_ADD); }
 465         ;
 466
 467 exp     :       exp '-' exp
 468                         { write_exp_elt_opcode (BINOP_SUB); }
 469         ;
 470
 471 exp     :       exp LSH exp
 472                         { write_exp_elt_opcode (BINOP_LSH); }
 473         ;
 474
 475 exp     :       exp RSH exp
 476                         { write_exp_elt_opcode (BINOP_RSH); }
 477         ;
 478
 479 exp     :       exp EQUAL exp
 480                         { write_exp_elt_opcode (BINOP_EQUAL); }
 481         ;
 482
 483 exp     :       exp NOTEQUAL exp
 484                         { write_exp_elt_opcode (BINOP_NOTEQUAL); }
 485         ;
 486
 487 exp     :       exp LEQ exp
 488                         { write_exp_elt_opcode (BINOP_LEQ); }
 489         ;
 490
 491 exp     :       exp GEQ exp
 492                         { write_exp_elt_opcode (BINOP_GEQ); }
 493         ;
 494
 495 exp     :       exp '<' exp
 496                         { write_exp_elt_opcode (BINOP_LESS); }
 497         ;
 498
 499 exp     :       exp '>' exp
 500                         { write_exp_elt_opcode (BINOP_GTR); }
 501         ;
 502
 503 exp     :       exp '&' exp
 504                         { write_exp_elt_opcode (BINOP_BITWISE_AND); }
 505         ;
 506
 507 exp     :       exp '^' exp
 508                         { write_exp_elt_opcode (BINOP_BITWISE_XOR); }
 509         ;
 510
 511 exp     :       exp '|' exp
 512                         { write_exp_elt_opcode (BINOP_BITWISE_IOR); }
 513         ;
 514
 515 exp     :       exp ANDAND exp
 516                         { write_exp_elt_opcode (BINOP_LOGICAL_AND); }
 517         ;
 518
 519 exp     :       exp OROR exp
 520                         { write_exp_elt_opcode (BINOP_LOGICAL_OR); }
 521         ;
 522
 523 exp     :       exp '?' exp ':' exp     %prec '?'
 524                         { write_exp_elt_opcode (TERNOP_COND); }
 525         ;
 526
 527 exp     :       exp '=' exp
 528                         { write_exp_elt_opcode (BINOP_ASSIGN); }
 529         ;
 530
 531 exp     :       exp ASSIGN_MODIFY exp
 532                         { write_exp_elt_opcode (BINOP_ASSIGN_MODIFY);
 533                           write_exp_elt_opcode ($2);
 534                           write_exp_elt_opcode (BINOP_ASSIGN_MODIFY); }
 535         ;
 536
 537 exp     :       INT
 538                         { write_exp_elt_opcode (OP_LONG);
 539                           write_exp_elt_type ($1.type);
 540                           write_exp_elt_longcst ((LONGEST)($1.val));
 541                           write_exp_elt_opcode (OP_LONG); }
 542         ;
 543
 544 exp     :       NAME_OR_INT
 545                         { YYSTYPE val;
 546                           parse_number ($1.stoken.ptr, $1.stoken.length, 0, &val);
 547                           write_exp_elt_opcode (OP_LONG);
 548                           write_exp_elt_type (val.typed_val_int.type);
 549                           write_exp_elt_longcst ((LONGEST)val.typed_val_int.val);
 550                           write_exp_elt_opcode (OP_LONG);
 551                         }
 552         ;
 553
 554
 555 exp     :       FLOAT
 556                         { write_exp_elt_opcode (OP_DOUBLE);
 557                           write_exp_elt_type ($1.type);
 558                           write_exp_elt_dblcst ($1.dval);
 559                           write_exp_elt_opcode (OP_DOUBLE); }
 560         ;
 561
 562 exp     :       variable
 563         ;
 564
 565 exp     :       VARIABLE
 566                         /* Already written by write_dollar_variable.  */
 567         ;
 568
 569 exp     :       SELECTOR
 570                         {
 571                           write_exp_elt_opcode (OP_OBJC_SELECTOR);
 572                           write_exp_string ($1);
 573                           write_exp_elt_opcode (OP_OBJC_SELECTOR); }
 574         ;
 575
 576 exp     :       SIZEOF '(' type ')'     %prec UNARY
 577                         { write_exp_elt_opcode (OP_LONG);
 578                           write_exp_elt_type (builtin_type_int);
 579                           CHECK_TYPEDEF ($3);
 580                           write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
 581                           write_exp_elt_opcode (OP_LONG); }
 582         ;
 583
 584 exp     :       STRING
 585                         { /* C strings are converted into array
 586                              constants with an explicit null byte
 587                              added at the end.  Thus the array upper
 588                              bound is the string length.  There is no
 589                              such thing in C as a completely empty
 590                              string.  */
 591                           char *sp = $1.ptr; int count = $1.length;
 592                           while (count-- > 0)
 593                             {
 594                               write_exp_elt_opcode (OP_LONG);
 595                               write_exp_elt_type (builtin_type_char);
 596                               write_exp_elt_longcst ((LONGEST)(*sp++));
 597                               write_exp_elt_opcode (OP_LONG);
 598                             }
 599                           write_exp_elt_opcode (OP_LONG);
 600                           write_exp_elt_type (builtin_type_char);
 601                           write_exp_elt_longcst ((LONGEST)'\0');
 602                           write_exp_elt_opcode (OP_LONG);
 603                           write_exp_elt_opcode (OP_ARRAY);
 604                           write_exp_elt_longcst ((LONGEST) 0);
 605                           write_exp_elt_longcst ((LONGEST) ($1.length));
 606                           write_exp_elt_opcode (OP_ARRAY); }
 607         ;
 608
 609 exp     :       NSSTRING        /* ObjC NextStep NSString constant
 610                                  * of the form '@' '"' string '"'.
 611                                  */
 612                         { write_exp_elt_opcode (OP_OBJC_NSSTRING);
 613                           write_exp_string ($1);
 614                           write_exp_elt_opcode (OP_OBJC_NSSTRING); }
 615         ;
 616
 617 block   :       BLOCKNAME
 618                         {
 619                           if ($1.sym != 0)
 620                               $$ = SYMBOL_BLOCK_VALUE ($1.sym);
 621                           else
 622                             {
 623                               struct symtab *tem =
 624                                   lookup_symtab (copy_name ($1.stoken));
 625                               if (tem)
 626                                 $$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem), STATIC_BLOCK);
 627                               else
 628                                 error ("No file or function \"%s\".",
 629                                        copy_name ($1.stoken));
 630                             }
 631                         }
 632         ;
 633
 634 block   :       block COLONCOLON name
 635                         { struct symbol *tem
 636                             = lookup_symbol (copy_name ($3), $1,
 637                                              VAR_DOMAIN, (int *) NULL);
 638                           if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
 639                             error ("No function \"%s\" in specified context.",
 640                                    copy_name ($3));
 641                           $$ = SYMBOL_BLOCK_VALUE (tem); }
 642         ;
 643
 644 variable:       block COLONCOLON name
 645                         { struct symbol *sym;
 646                           sym = lookup_symbol (copy_name ($3), $1,
 647                                                VAR_DOMAIN, (int *) NULL);
 648                           if (sym == 0)
 649                             error ("No symbol \"%s\" in specified context.",
 650                                    copy_name ($3));
 651
 652                           write_exp_elt_opcode (OP_VAR_VALUE);
 653                           /* block_found is set by lookup_symbol.  */
 654                           write_exp_elt_block (block_found);
 655                           write_exp_elt_sym (sym);
 656                           write_exp_elt_opcode (OP_VAR_VALUE); }
 657         ;
 658
 659 qualified_name: typebase COLONCOLON name
 660                         {
 661                           struct type *type = $1;
 662                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 663                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 664                             error ("`%s' is not defined as an aggregate type.",
 665                                    TYPE_NAME (type));
 666
 667                           write_exp_elt_opcode (OP_SCOPE);
 668                           write_exp_elt_type (type);
 669                           write_exp_string ($3);
 670                           write_exp_elt_opcode (OP_SCOPE);
 671                         }
 672         |       typebase COLONCOLON '~' name
 673                         {
 674                           struct type *type = $1;
 675                           struct stoken tmp_token;
 676                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 677                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 678                             error ("`%s' is not defined as an aggregate type.",
 679                                    TYPE_NAME (type));
 680
 681                           if (strcmp (type_name_no_tag (type), $4.ptr) != 0)
 682                             error ("invalid destructor `%s::~%s'",
 683                                    type_name_no_tag (type), $4.ptr);
 684
 685                           tmp_token.ptr = (char*) alloca ($4.length + 2);
 686                           tmp_token.length = $4.length + 1;
 687                           tmp_token.ptr[0] = '~';
 688                           memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
 689                           tmp_token.ptr[tmp_token.length] = 0;
 690                           write_exp_elt_opcode (OP_SCOPE);
 691                           write_exp_elt_type (type);
 692                           write_exp_string (tmp_token);
 693                           write_exp_elt_opcode (OP_SCOPE);
 694                         }
 695         ;
 696
 697 variable:       qualified_name
 698         |       COLONCOLON name
 699                         {
 700                           char *name = copy_name ($2);
 701                           struct symbol *sym;
 702                           struct minimal_symbol *msymbol;
 703
 704                           sym =
 705                             lookup_symbol (name, (const struct block *) NULL,
 706                                            VAR_DOMAIN, (int *) NULL);
 707                           if (sym)
 708                             {
 709                               write_exp_elt_opcode (OP_VAR_VALUE);
 710                               write_exp_elt_block (NULL);
 711                               write_exp_elt_sym (sym);
 712                               write_exp_elt_opcode (OP_VAR_VALUE);
 713                               break;
 714                             }
 715
 716                           msymbol = lookup_minimal_symbol (name, NULL, NULL);
 717                           if (msymbol != NULL)
 718                             write_exp_msymbol (msymbol);
 719                           else if (!have_full_symbols () && !have_partial_symbols ())
 720                             error ("No symbol table is loaded.  Use the \"file\" command.");
 721                           else
 722                             error ("No symbol \"%s\" in current context.", name);
 723                         }
 724         ;
 725
 726 variable:       name_not_typename
 727                         { struct symbol *sym = $1.sym;
 728
 729                           if (sym)
 730                             {
 731                               if (symbol_read_needs_frame (sym))
 732                                 {
 733                                   if (innermost_block == 0 ||
 734                                       contained_in (block_found,
 735                                                     innermost_block))
 736                                     innermost_block = block_found;
 737                                 }
 738
 739                               write_exp_elt_opcode (OP_VAR_VALUE);
 740                               /* We want to use the selected frame, not
 741                                  another more inner frame which happens to
 742                                  be in the same block.  */
 743                               write_exp_elt_block (NULL);
 744                               write_exp_elt_sym (sym);
 745                               write_exp_elt_opcode (OP_VAR_VALUE);
 746                             }
 747                           else if ($1.is_a_field_of_this)
 748                             {
 749                               /* C++/ObjC: it hangs off of `this'/'self'.
 750                                  Must not inadvertently convert from a
 751                                  method call to data ref.  */
 752                               if (innermost_block == 0 ||
 753                                   contained_in (block_found, innermost_block))
 754                                 innermost_block = block_found;
 755                               write_exp_elt_opcode (OP_OBJC_SELF);
 756                               write_exp_elt_opcode (OP_OBJC_SELF);
 757                               write_exp_elt_opcode (STRUCTOP_PTR);
 758                               write_exp_string ($1.stoken);
 759                               write_exp_elt_opcode (STRUCTOP_PTR);
 760                             }
 761                           else
 762                             {
 763                               struct minimal_symbol *msymbol;
 764                               char *arg = copy_name ($1.stoken);
 765
 766                               msymbol =
 767                                 lookup_minimal_symbol (arg, NULL, NULL);
 768                               if (msymbol != NULL)
 769                                 write_exp_msymbol (msymbol);
 770                               else if (!have_full_symbols () &&
 771                                        !have_partial_symbols ())
 772                                 error ("No symbol table is loaded.  Use the \"file\" command.");
 773                               else
 774                                 error ("No symbol \"%s\" in current context.",
 775                                        copy_name ($1.stoken));
 776                             }
 777                         }
 778         ;
 779
 780
 781 ptype   :       typebase
 782         /* "const" and "volatile" are curently ignored.  A type
 783            qualifier before the type is currently handled in the
 784            typebase rule.  The reason for recognizing these here
 785            (shift/reduce conflicts) might be obsolete now that some
 786            pointer to member rules have been deleted.  */
 787         |       typebase CONST_KEYWORD
 788         |       typebase VOLATILE_KEYWORD
 789         |       typebase abs_decl
 790                 { $$ = follow_types ($1); }
 791         |       typebase CONST_KEYWORD abs_decl
 792                 { $$ = follow_types ($1); }
 793         |       typebase VOLATILE_KEYWORD abs_decl
 794                 { $$ = follow_types ($1); }
 795         ;
 796
 797 abs_decl:       '*'
 798                         { push_type (tp_pointer); $$ = 0; }
 799         |       '*' abs_decl
 800                         { push_type (tp_pointer); $$ = $2; }
 801         |       '&'
 802                         { push_type (tp_reference); $$ = 0; }
 803         |       '&' abs_decl
 804                         { push_type (tp_reference); $$ = $2; }
 805         |       direct_abs_decl
 806         ;
 807
 808 direct_abs_decl: '(' abs_decl ')'
 809                         { $$ = $2; }
 810         |       direct_abs_decl array_mod
 811                         {
 812                           push_type_int ($2);
 813                           push_type (tp_array);
 814                         }
 815         |       array_mod
 816                         {
 817                           push_type_int ($1);
 818                           push_type (tp_array);
 819                           $$ = 0;
 820                         }
 821
 822         |       direct_abs_decl func_mod
 823                         { push_type (tp_function); }
 824         |       func_mod
 825                         { push_type (tp_function); }
 826         ;
 827
 828 array_mod:      '[' ']'
 829                         { $$ = -1; }
 830         |       '[' INT ']'
 831                         { $$ = $2.val; }
 832         ;
 833
 834 func_mod:       '(' ')'
 835                         { $$ = 0; }
 836         |       '(' nonempty_typelist ')'
 837                         { free ($2); $$ = 0; }
 838         ;
 839
 840 /* We used to try to recognize more pointer to member types here, but
 841    that didn't work (shift/reduce conflicts meant that these rules
 842    never got executed).  The problem is that
 843      int (foo::bar::baz::bizzle)
 844    is a function type but
 845      int (foo::bar::baz::bizzle::*)
 846    is a pointer to member type.  Stroustrup loses again!  */
 847
 848 type    :       ptype
 849         ;
 850
 851 typebase  /* Implements (approximately): (type-qualifier)* type-specifier.  */
 852         :       TYPENAME
 853                         { $$ = $1.type; }
 854         |       CLASSNAME
 855                         {
 856                           if ($1.type == NULL)
 857                             error ("No symbol \"%s\" in current context.",
 858                                    copy_name($1.stoken));
 859                           else
 860                             $$ = $1.type;
 861                         }
 862         |       INT_KEYWORD
 863                         { $$ = builtin_type_int; }
 864         |       LONG
 865                         { $$ = builtin_type_long; }
 866         |       SHORT
 867                         { $$ = builtin_type_short; }
 868         |       LONG INT_KEYWORD
 869                         { $$ = builtin_type_long; }
 870         |       UNSIGNED LONG INT_KEYWORD
 871                         { $$ = builtin_type_unsigned_long; }
 872         |       LONG LONG
 873                         { $$ = builtin_type_long_long; }
 874         |       LONG LONG INT_KEYWORD
 875                         { $$ = builtin_type_long_long; }
 876         |       UNSIGNED LONG LONG
 877                         { $$ = builtin_type_unsigned_long_long; }
 878         |       UNSIGNED LONG LONG INT_KEYWORD
 879                         { $$ = builtin_type_unsigned_long_long; }
 880         |       SHORT INT_KEYWORD
 881                         { $$ = builtin_type_short; }
 882         |       UNSIGNED SHORT INT_KEYWORD
 883                         { $$ = builtin_type_unsigned_short; }
 884         |       DOUBLE_KEYWORD
 885                         { $$ = builtin_type_double; }
 886         |       LONG DOUBLE_KEYWORD
 887                         { $$ = builtin_type_long_double; }
 888         |       STRUCT name
 889                         { $$ = lookup_struct (copy_name ($2),
 890                                               expression_context_block); }
 891         |       CLASS name
 892                         { $$ = lookup_struct (copy_name ($2),
 893                                               expression_context_block); }
 894         |       UNION name
 895                         { $$ = lookup_union (copy_name ($2),
 896                                              expression_context_block); }
 897         |       ENUM name
 898                         { $$ = lookup_enum (copy_name ($2),
 899                                             expression_context_block); }
 900         |       UNSIGNED typename
 901                         { $$ = lookup_unsigned_typename (TYPE_NAME($2.type)); }
 902         |       UNSIGNED
 903                         { $$ = builtin_type_unsigned_int; }
 904         |       SIGNED_KEYWORD typename
 905                         { $$ = lookup_signed_typename (TYPE_NAME($2.type)); }
 906         |       SIGNED_KEYWORD
 907                         { $$ = builtin_type_int; }
 908         |       TEMPLATE name '<' type '>'
 909                         { $$ = lookup_template_type(copy_name($2), $4,
 910                                                     expression_context_block);
 911                         }
 912         /* "const" and "volatile" are curently ignored.  A type
 913            qualifier after the type is handled in the ptype rule.  I
 914            think these could be too.  */
 915         |       CONST_KEYWORD typebase { $$ = $2; }
 916         |       VOLATILE_KEYWORD typebase { $$ = $2; }
 917         ;
 918
 919 typename:       TYPENAME
 920         |       INT_KEYWORD
 921                 {
 922                   $$.stoken.ptr = "int";
 923                   $$.stoken.length = 3;
 924                   $$.type = builtin_type_int;
 925                 }
 926         |       LONG
 927                 {
 928                   $$.stoken.ptr = "long";
 929                   $$.stoken.length = 4;
 930                   $$.type = builtin_type_long;
 931                 }
 932         |       SHORT
 933                 {
 934                   $$.stoken.ptr = "short";
 935                   $$.stoken.length = 5;
 936                   $$.type = builtin_type_short;
 937                 }
 938         ;
 939
 940 nonempty_typelist
 941         :       type
 942                 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
 943                   $<ivec>$[0] = 1;      /* Number of types in vector.  */
 944                   $$[1] = $1;
 945                 }
 946         |       nonempty_typelist ',' type
 947                 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
 948                   $$ = (struct type **) realloc ((char *) $1, len);
 949                   $$[$<ivec>$[0]] = $3;
 950                 }
 951         ;
 952
 953 name    :       NAME        { $$ = $1.stoken; }
 954         |       BLOCKNAME   { $$ = $1.stoken; }
 955         |       TYPENAME    { $$ = $1.stoken; }
 956         |       CLASSNAME   { $$ = $1.stoken; }
 957         |       NAME_OR_INT { $$ = $1.stoken; }
 958         ;
 959
 960 name_not_typename :     NAME
 961         |       BLOCKNAME
 962 /* These would be useful if name_not_typename was useful, but it is
 963    just a fake for "variable", so these cause reduce/reduce conflicts
 964    because the parser can't tell whether NAME_OR_INT is a
 965    name_not_typename (=variable, =exp) or just an exp.  If
 966    name_not_typename was ever used in an lvalue context where only a
 967    name could occur, this might be useful.  */
 968 /*      | NAME_OR_INT */
 969         ;
 970
 971 %%
 972
 973 /* Take care of parsing a number (anything that starts with a digit).
 974    Set yylval and return the token type; update lexptr.  LEN is the
 975    number of characters in it.  */
 976
 977 /*** Needs some error checking for the float case.  ***/
 978
 979 static int
 980 parse_number (p, len, parsed_float, putithere)
 981      char *p;
 982      int len;
 983      int parsed_float;
 984      YYSTYPE *putithere;
 985 {
 986   /* FIXME: Shouldn't these be unsigned?  We don't deal with negative
 987      values here, and we do kind of silly things like cast to
 988      unsigned.  */
 989   LONGEST n = 0;
 990   LONGEST prevn = 0;
 991   unsigned LONGEST un;
 992
 993   int i = 0;
 994   int c;
 995   int base = input_radix;
 996   int unsigned_p = 0;
 997
 998   /* Number of "L" suffixes encountered.  */
 999   int long_p = 0;
1000
1001   /* We have found a "L" or "U" suffix.  */
1002   int found_suffix = 0;
1003
1004   unsigned LONGEST high_bit;
1005   struct type *signed_type;
1006   struct type *unsigned_type;
1007
1008   if (parsed_float)
1009     {
1010       char c;
1011
1012       /* It's a float since it contains a point or an exponent.  */
1013
1014       sscanf (p, "%" DOUBLEST_SCAN_FORMAT "%c",
1015               &putithere->typed_val_float.dval, &c);
1016
1017       /* See if it has `f' or `l' suffix (float or long double).  */
1018
1019       c = tolower (p[len - 1]);
1020
1021       if (c == 'f')
1022         putithere->typed_val_float.type = builtin_type_float;
1023       else if (c == 'l')
1024         putithere->typed_val_float.type = builtin_type_long_double;
1025       else if (isdigit (c) || c == '.')
1026         putithere->typed_val_float.type = builtin_type_double;
1027       else
1028         return ERROR;
1029
1030       return FLOAT;
1031     }
1032
1033   /* Handle base-switching prefixes 0x, 0t, 0d, and 0.  */
1034   if (p[0] == '0')
1035     switch (p[1])
1036       {
1037       case 'x':
1038       case 'X':
1039         if (len >= 3)
1040           {
1041             p += 2;
1042             base = 16;
1043             len -= 2;
1044           }
1045         break;
1046
1047       case 't':
1048       case 'T':
1049       case 'd':
1050       case 'D':
1051         if (len >= 3)
1052           {
1053             p += 2;
1054             base = 10;
1055             len -= 2;
1056           }
1057         break;
1058
1059       default:
1060         base = 8;
1061         break;
1062       }
1063
1064   while (len-- > 0)
1065     {
1066       c = *p++;
1067       if (c >= 'A' && c <= 'Z')
1068         c += 'a' - 'A';
1069       if (c != 'l' && c != 'u')
1070         n *= base;
1071       if (c >= '0' && c <= '9')
1072         {
1073           if (found_suffix)
1074             return ERROR;
1075           n += i = c - '0';
1076         }
1077       else
1078         {
1079           if (base > 10 && c >= 'a' && c <= 'f')
1080             {
1081               if (found_suffix)
1082                 return ERROR;
1083               n += i = c - 'a' + 10;
1084             }
1085           else if (c == 'l')
1086             {
1087               ++long_p;
1088               found_suffix = 1;
1089             }
1090           else if (c == 'u')
1091             {
1092               unsigned_p = 1;
1093               found_suffix = 1;
1094             }
1095           else
1096             return ERROR;       /* Char not a digit.  */
1097         }
1098       if (i >= base)
1099         return ERROR;           /* Invalid digit in this base.  */
1100
1101       /* Portably test for overflow (only works for nonzero values, so
1102          make a second check for zero).  FIXME: Can't we just make n
1103          and prevn unsigned and avoid this?  */
1104       if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1105         unsigned_p = 1;         /* Try something unsigned.  */
1106
1107       /* Portably test for unsigned overflow.
1108          FIXME: This check is wrong; for example it doesn't find
1109          overflow on 0x123456789 when LONGEST is 32 bits.  */
1110       if (c != 'l' && c != 'u' && n != 0)
1111         {
1112           if ((unsigned_p && (unsigned LONGEST) prevn >= (unsigned LONGEST) n))
1113             error ("Numeric constant too large.");
1114         }
1115       prevn = n;
1116     }
1117
1118   /* An integer constant is an int, a long, or a long long.  An L
1119      suffix forces it to be long; an LL suffix forces it to be long
1120      long.  If not forced to a larger size, it gets the first type of
1121      the above that it fits in.  To figure out whether it fits, we
1122      shift it right and see whether anything remains.  Note that we
1123      can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1124      operation, because many compilers will warn about such a shift
1125      (which always produces a zero result).  Sometimes gdbarch_int_bit
1126      or gdbarch_long_int will be that big, sometimes not.  To deal with
1127      the case where it is we just always shift the value more than
1128      once, with fewer bits each time.  */
1129
1130   un = (unsigned LONGEST)n >> 2;
1131   if (long_p == 0
1132       && (un >> (gdbarch_int_bit (current_gdbarch) - 2)) == 0)
1133     {
1134       high_bit = ((unsigned LONGEST)1) << (gdbarch_int_bit (current_gdbarch) - 1);
1135
1136       /* A large decimal (not hex or octal) constant (between INT_MAX
1137          and UINT_MAX) is a long or unsigned long, according to ANSI,
1138          never an unsigned int, but this code treats it as unsigned
1139          int.  This probably should be fixed.  GCC gives a warning on
1140          such constants.  */
1141
1142       unsigned_type = builtin_type_unsigned_int;
1143       signed_type = builtin_type_int;
1144     }
1145   else if (long_p <= 1
1146            && (un >> (gdbarch_long_bit (current_gdbarch) - 2)) == 0)
1147     {
1148       high_bit = ((unsigned LONGEST)1) << (gdbarch_long_bit (current_gdbarch) - 1);
1149       unsigned_type = builtin_type_unsigned_long;
1150       signed_type = builtin_type_long;
1151     }
1152   else
1153     {
1154       high_bit = (((unsigned LONGEST)1)
1155                   << (gdbarch_long_long_bit (current_gdbarch) - 32 - 1)
1156                   << 16
1157                   << 16);
1158       if (high_bit == 0)
1159         /* A long long does not fit in a LONGEST.  */
1160         high_bit =
1161           (unsigned LONGEST)1 << (sizeof (LONGEST) * HOST_CHAR_BIT - 1);
1162       unsigned_type = builtin_type_unsigned_long_long;
1163       signed_type = builtin_type_long_long;
1164     }
1165
1166    putithere->typed_val_int.val = n;
1167
1168    /* If the high bit of the worked out type is set then this number
1169       has to be unsigned.  */
1170
1171    if (unsigned_p || (n & high_bit))
1172      {
1173        putithere->typed_val_int.type = unsigned_type;
1174      }
1175    else
1176      {
1177        putithere->typed_val_int.type = signed_type;
1178      }
1179
1180    return INT;
1181 }
1182
1183 struct token
1184 {
1185   char *operator;
1186   int token;
1187   enum exp_opcode opcode;
1188 };
1189
1190 static const struct token tokentab3[] =
1191   {
1192     {">>=", ASSIGN_MODIFY, BINOP_RSH},
1193     {"<<=", ASSIGN_MODIFY, BINOP_LSH}
1194   };
1195
1196 static const struct token tokentab2[] =
1197   {
1198     {"+=", ASSIGN_MODIFY, BINOP_ADD},
1199     {"-=", ASSIGN_MODIFY, BINOP_SUB},
1200     {"*=", ASSIGN_MODIFY, BINOP_MUL},
1201     {"/=", ASSIGN_MODIFY, BINOP_DIV},
1202     {"%=", ASSIGN_MODIFY, BINOP_REM},
1203     {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR},
1204     {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND},
1205     {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR},
1206     {"++", INCREMENT, BINOP_END},
1207     {"--", DECREMENT, BINOP_END},
1208     {"->", ARROW, BINOP_END},
1209     {"&&", ANDAND, BINOP_END},
1210     {"||", OROR, BINOP_END},
1211     {"::", COLONCOLON, BINOP_END},
1212     {"<<", LSH, BINOP_END},
1213     {">>", RSH, BINOP_END},
1214     {"==", EQUAL, BINOP_END},
1215     {"!=", NOTEQUAL, BINOP_END},
1216     {"<=", LEQ, BINOP_END},
1217     {">=", GEQ, BINOP_END}
1218   };
1219
1220 /* Read one token, getting characters through lexptr.  */
1221
1222 static int
1223 yylex ()
1224 {
1225   int c, tokchr;
1226   int namelen;
1227   unsigned int i;
1228   char *tokstart;
1229   char *tokptr;
1230   int tempbufindex;
1231   static char *tempbuf;
1232   static int tempbufsize;
1233
1234  retry:
1235
1236   tokstart = lexptr;
1237   /* See if it is a special token of length 3.  */
1238   for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1239     if (strncmp (tokstart, tokentab3[i].operator, 3) == 0)
1240       {
1241         lexptr += 3;
1242         yylval.opcode = tokentab3[i].opcode;
1243         return tokentab3[i].token;
1244       }
1245
1246   /* See if it is a special token of length 2.  */
1247   for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1248     if (strncmp (tokstart, tokentab2[i].operator, 2) == 0)
1249       {
1250         lexptr += 2;
1251         yylval.opcode = tokentab2[i].opcode;
1252         return tokentab2[i].token;
1253       }
1254
1255   c = 0;
1256   switch (tokchr = *tokstart)
1257     {
1258     case 0:
1259       return 0;
1260
1261     case ' ':
1262     case '\t':
1263     case '\n':
1264       lexptr++;
1265       goto retry;
1266
1267     case '\'':
1268       /* We either have a character constant ('0' or '\177' for
1269          example) or we have a quoted symbol reference ('foo(int,int)'
1270          in C++ for example).  */
1271       lexptr++;
1272       c = *lexptr++;
1273       if (c == '\\')
1274         c = parse_escape (&lexptr);
1275       else if (c == '\'')
1276         error ("Empty character constant.");
1277
1278       yylval.typed_val_int.val = c;
1279       yylval.typed_val_int.type = builtin_type_char;
1280
1281       c = *lexptr++;
1282       if (c != '\'')
1283         {
1284           namelen = skip_quoted (tokstart) - tokstart;
1285           if (namelen > 2)
1286             {
1287               lexptr = tokstart + namelen;
1288               if (lexptr[-1] != '\'')
1289                 error ("Unmatched single quote.");
1290               namelen -= 2;
1291               tokstart++;
1292               goto tryname;
1293             }
1294           error ("Invalid character constant.");
1295         }
1296       return INT;
1297
1298     case '(':
1299       paren_depth++;
1300       lexptr++;
1301       return '(';
1302
1303     case ')':
1304       if (paren_depth == 0)
1305         return 0;
1306       paren_depth--;
1307       lexptr++;
1308       return ')';
1309
1310     case ',':
1311       if (comma_terminates && paren_depth == 0)
1312         return 0;
1313       lexptr++;
1314       return ',';
1315
1316     case '.':
1317       /* Might be a floating point number.  */
1318       if (lexptr[1] < '0' || lexptr[1] > '9')
1319         goto symbol;            /* Nope, must be a symbol.  */
1320       /* FALL THRU into number case.  */
1321
1322     case '0':
1323     case '1':
1324     case '2':
1325     case '3':
1326     case '4':
1327     case '5':
1328     case '6':
1329     case '7':
1330     case '8':
1331     case '9':
1332       {
1333         /* It's a number.  */
1334         int got_dot = 0, got_e = 0, toktype = FLOAT;
1335         /* Initialize toktype to anything other than ERROR.  */
1336         char *p = tokstart;
1337         int hex = input_radix > 10;
1338         int local_radix = input_radix;
1339         if (tokchr == '0' && (p[1] == 'x' || p[1] == 'X'))
1340           {
1341             p += 2;
1342             hex = 1;
1343             local_radix = 16;
1344           }
1345         else if (tokchr == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1346           {
1347             p += 2;
1348             hex = 0;
1349             local_radix = 10;
1350           }
1351
1352         for (;; ++p)
1353           {
1354             /* This test includes !hex because 'e' is a valid hex digit
1355                and thus does not indicate a floating point number when
1356                the radix is hex.  */
1357
1358             if (!hex && (*p == 'e' || *p == 'E'))
1359               if (got_e)
1360                 toktype = ERROR;        /* Only one 'e' in a float.  */
1361               else
1362                 got_e = 1;
1363             /* This test does not include !hex, because a '.' always
1364                indicates a decimal floating point number regardless of
1365                the radix.  */
1366             else if (*p == '.')
1367               if (got_dot)
1368                 toktype = ERROR;        /* Only one '.' in a float.  */
1369               else
1370                 got_dot = 1;
1371             else if (got_e && (p[-1] == 'e' || p[-1] == 'E') &&
1372                     (*p == '-' || *p == '+'))
1373               /* This is the sign of the exponent, not the end of the
1374                  number.  */
1375               continue;
1376             /* Always take decimal digits; parse_number handles radix
1377                error.  */
1378             else if (*p >= '0' && *p <= '9')
1379               continue;
1380             /* We will take letters only if hex is true, and only up
1381                to what the input radix would permit.  FSF was content
1382                to rely on parse_number to validate; but it leaks.  */
1383             else if (*p >= 'a' && *p <= 'z')
1384               {
1385                 if (!hex || *p >= ('a' + local_radix - 10))
1386                   toktype = ERROR;
1387               }
1388             else if (*p >= 'A' && *p <= 'Z')
1389               {
1390                 if (!hex || *p >= ('A' + local_radix - 10))
1391                   toktype = ERROR;
1392               }
1393             else break;
1394           }
1395         if (toktype != ERROR)
1396           toktype = parse_number (tokstart, p - tokstart,
1397                                   got_dot | got_e, &yylval);
1398         if (toktype == ERROR)
1399           {
1400             char *err_copy = (char *) alloca (p - tokstart + 1);
1401
1402             memcpy (err_copy, tokstart, p - tokstart);
1403             err_copy[p - tokstart] = 0;
1404             error ("Invalid number \"%s\".", err_copy);
1405           }
1406         lexptr = p;
1407         return toktype;
1408       }
1409
1410     case '+':
1411     case '-':
1412     case '*':
1413     case '/':
1414     case '%':
1415     case '|':
1416     case '&':
1417     case '^':
1418     case '~':
1419     case '!':
1420 #if 0
1421     case '@':           /* Moved out below.  */
1422 #endif
1423     case '<':
1424     case '>':
1425     case '[':
1426     case ']':
1427     case '?':
1428     case ':':
1429     case '=':
1430     case '{':
1431     case '}':
1432     symbol:
1433       lexptr++;
1434       return tokchr;
1435
1436     case '@':
1437       if (strncmp(tokstart, "@selector", 9) == 0)
1438         {
1439           tokptr = strchr(tokstart, '(');
1440           if (tokptr == NULL)
1441             {
1442               error ("Missing '(' in @selector(...)");
1443             }
1444           tempbufindex = 0;
1445           tokptr++;     /* Skip the '('.  */
1446           do {
1447             /* Grow the static temp buffer if necessary, including
1448                allocating the first one on demand.  */
1449             if (tempbufindex + 1 >= tempbufsize)
1450               {
1451                 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1452               }
1453             tempbuf[tempbufindex++] = *tokptr++;
1454           } while ((*tokptr != ')') && (*tokptr != '\0'));
1455           if (*tokptr++ != ')')
1456             {
1457               error ("Missing ')' in @selector(...)");
1458             }
1459           tempbuf[tempbufindex] = '\0';
1460           yylval.sval.ptr = tempbuf;
1461           yylval.sval.length = tempbufindex;
1462           lexptr = tokptr;
1463           return SELECTOR;
1464         }
1465       if (tokstart[1] != '"')
1466         {
1467           lexptr++;
1468           return tokchr;
1469         }
1470       /* ObjC NextStep NSString constant: fall thru and parse like
1471          STRING.  */
1472       tokstart++;
1473
1474     case '"':
1475
1476       /* Build the gdb internal form of the input string in tempbuf,
1477          translating any standard C escape forms seen.  Note that the
1478          buffer is null byte terminated *only* for the convenience of
1479          debugging gdb itself and printing the buffer contents when
1480          the buffer contains no embedded nulls.  Gdb does not depend
1481          upon the buffer being null byte terminated, it uses the
1482          length string instead.  This allows gdb to handle C strings
1483          (as well as strings in other languages) with embedded null
1484          bytes.  */
1485
1486       tokptr = ++tokstart;
1487       tempbufindex = 0;
1488
1489       do {
1490         /* Grow the static temp buffer if necessary, including
1491            allocating the first one on demand.  */
1492         if (tempbufindex + 1 >= tempbufsize)
1493           {
1494             tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1495           }
1496         switch (*tokptr)
1497           {
1498           case '\0':
1499           case '"':
1500             /* Do nothing, loop will terminate.  */
1501             break;
1502           case '\\':
1503             tokptr++;
1504             c = parse_escape (&tokptr);
1505             if (c == -1)
1506               {
1507                 continue;
1508               }
1509             tempbuf[tempbufindex++] = c;
1510             break;
1511           default:
1512             tempbuf[tempbufindex++] = *tokptr++;
1513             break;
1514           }
1515       } while ((*tokptr != '"') && (*tokptr != '\0'));
1516       if (*tokptr++ != '"')
1517         {
1518           error ("Unterminated string in expression.");
1519         }
1520       tempbuf[tempbufindex] = '\0';     /* See note above.  */
1521       yylval.sval.ptr = tempbuf;
1522       yylval.sval.length = tempbufindex;
1523       lexptr = tokptr;
1524       return (tokchr == '@' ? NSSTRING : STRING);
1525     }
1526
1527   if (!(tokchr == '_' || tokchr == '$' ||
1528        (tokchr >= 'a' && tokchr <= 'z') || (tokchr >= 'A' && tokchr <= 'Z')))
1529     /* We must have come across a bad character (e.g. ';').  */
1530     error ("Invalid character '%c' in expression.", c);
1531
1532   /* It's a name.  See how long it is.  */
1533   namelen = 0;
1534   for (c = tokstart[namelen];
1535        (c == '_' || c == '$' || (c >= '0' && c <= '9')
1536         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1537     {
1538        if (c == '<')
1539          {
1540            int i = namelen;
1541            while (tokstart[++i] && tokstart[i] != '>');
1542            if (tokstart[i] == '>')
1543              namelen = i;
1544           }
1545        c = tokstart[++namelen];
1546      }
1547
1548   /* The token "if" terminates the expression and is NOT
1549      removed from the input stream.  */
1550   if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
1551     {
1552       return 0;
1553     }
1554
1555   lexptr += namelen;
1556
1557   tryname:
1558
1559   /* Catch specific keywords.  Should be done with a data structure.  */
1560   switch (namelen)
1561     {
1562     case 8:
1563       if (strncmp (tokstart, "unsigned", 8) == 0)
1564         return UNSIGNED;
1565       if (current_language->la_language == language_cplus
1566           && strncmp (tokstart, "template", 8) == 0)
1567         return TEMPLATE;
1568       if (strncmp (tokstart, "volatile", 8) == 0)
1569         return VOLATILE_KEYWORD;
1570       break;
1571     case 6:
1572       if (strncmp (tokstart, "struct", 6) == 0)
1573         return STRUCT;
1574       if (strncmp (tokstart, "signed", 6) == 0)
1575         return SIGNED_KEYWORD;
1576       if (strncmp (tokstart, "sizeof", 6) == 0)
1577         return SIZEOF;
1578       if (strncmp (tokstart, "double", 6) == 0)
1579         return DOUBLE_KEYWORD;
1580       break;
1581     case 5:
1582       if ((current_language->la_language == language_cplus)
1583           && strncmp (tokstart, "class", 5) == 0)
1584         return CLASS;
1585       if (strncmp (tokstart, "union", 5) == 0)
1586         return UNION;
1587       if (strncmp (tokstart, "short", 5) == 0)
1588         return SHORT;
1589       if (strncmp (tokstart, "const", 5) == 0)
1590         return CONST_KEYWORD;
1591       break;
1592     case 4:
1593       if (strncmp (tokstart, "enum", 4) == 0)
1594         return ENUM;
1595       if (strncmp (tokstart, "long", 4) == 0)
1596         return LONG;
1597       break;
1598     case 3:
1599       if (strncmp (tokstart, "int", 3) == 0)
1600         return INT_KEYWORD;
1601       break;
1602     default:
1603       break;
1604     }
1605
1606   yylval.sval.ptr = tokstart;
1607   yylval.sval.length = namelen;
1608
1609   if (*tokstart == '$')
1610     {
1611       write_dollar_variable (yylval.sval);
1612       return VARIABLE;
1613     }
1614
1615   /* Use token-type BLOCKNAME for symbols that happen to be defined as
1616      functions or symtabs.  If this is not so, then ...
1617      Use token-type TYPENAME for symbols that happen to be defined
1618      currently as names of types; NAME for other symbols.
1619      The caller is not constrained to care about the distinction.  */
1620   {
1621     char *tmp = copy_name (yylval.sval);
1622     struct symbol *sym;
1623     int is_a_field_of_this = 0, *need_this;
1624     int hextype;
1625
1626     if (current_language->la_language == language_cplus ||
1627         current_language->la_language == language_objc)
1628       need_this = &is_a_field_of_this;
1629     else
1630       need_this = (int *) NULL;
1631
1632     sym = lookup_symbol (tmp, expression_context_block,
1633                          VAR_DOMAIN,
1634                          need_this);
1635     /* Call lookup_symtab, not lookup_partial_symtab, in case there
1636        are no psymtabs (coff, xcoff, or some future change to blow
1637        away the psymtabs once symbols are read).  */
1638     if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK) ||
1639         lookup_symtab (tmp))
1640       {
1641         yylval.ssym.sym = sym;
1642         yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1643         return BLOCKNAME;
1644       }
1645     if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1646         {
1647 #if 1
1648           /* Despite the following flaw, we need to keep this code
1649              enabled.  Because we can get called from
1650              check_stub_method, if we don't handle nested types then
1651              it screws many operations in any program which uses
1652              nested types.  */
1653           /* In "A::x", if x is a member function of A and there
1654              happens to be a type (nested or not, since the stabs
1655              don't make that distinction) named x, then this code
1656              incorrectly thinks we are dealing with nested types
1657              rather than a member function.  */
1658
1659           char *p;
1660           char *namestart;
1661           struct symbol *best_sym;
1662
1663           /* Look ahead to detect nested types.  This probably should
1664              be done in the grammar, but trying seemed to introduce a
1665              lot of shift/reduce and reduce/reduce conflicts.  It's
1666              possible that it could be done, though.  Or perhaps a
1667              non-grammar, but less ad hoc, approach would work well.  */
1668
1669           /* Since we do not currently have any way of distinguishing
1670              a nested type from a non-nested one (the stabs don't tell
1671              us whether a type is nested), we just ignore the
1672              containing type.  */
1673
1674           p = lexptr;
1675           best_sym = sym;
1676           while (1)
1677             {
1678               /* Skip whitespace.  */
1679               while (*p == ' ' || *p == '\t' || *p == '\n')
1680                 ++p;
1681               if (*p == ':' && p[1] == ':')
1682                 {
1683                   /* Skip the `::'.  */
1684                   p += 2;
1685                   /* Skip whitespace.  */
1686                   while (*p == ' ' || *p == '\t' || *p == '\n')
1687                     ++p;
1688                   namestart = p;
1689                   while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1690                          || (*p >= 'a' && *p <= 'z')
1691                          || (*p >= 'A' && *p <= 'Z'))
1692                     ++p;
1693                   if (p != namestart)
1694                     {
1695                       struct symbol *cur_sym;
1696                       /* As big as the whole rest of the expression,
1697                          which is at least big enough.  */
1698                       char *ncopy = alloca (strlen (tmp) +
1699                                             strlen (namestart) + 3);
1700                       char *tmp1;
1701
1702                       tmp1 = ncopy;
1703                       memcpy (tmp1, tmp, strlen (tmp));
1704                       tmp1 += strlen (tmp);
1705                       memcpy (tmp1, "::", 2);
1706                       tmp1 += 2;
1707                       memcpy (tmp1, namestart, p - namestart);
1708                       tmp1[p - namestart] = '\0';
1709                       cur_sym = lookup_symbol (ncopy,
1710                                                expression_context_block,
1711                                                VAR_DOMAIN, (int *) NULL);
1712                       if (cur_sym)
1713                         {
1714                           if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1715                             {
1716                               best_sym = cur_sym;
1717                               lexptr = p;
1718                             }
1719                           else
1720                             break;
1721                         }
1722                       else
1723                         break;
1724                     }
1725                   else
1726                     break;
1727                 }
1728               else
1729                 break;
1730             }
1731
1732           yylval.tsym.type = SYMBOL_TYPE (best_sym);
1733 #else /* not 0 */
1734           yylval.tsym.type = SYMBOL_TYPE (sym);
1735 #endif /* not 0 */
1736           return TYPENAME;
1737         }
1738     yylval.tsym.type
1739       = language_lookup_primitive_type_by_name (current_language,
1740                                                 current_gdbarch, tmp);
1741     if (yylval.tsym.type != NULL)
1742       return TYPENAME;
1743
1744     /* See if it's an ObjC classname.  */
1745     if (!sym)
1746       {
1747         CORE_ADDR Class = lookup_objc_class(tmp);
1748         if (Class)
1749           {
1750             yylval.class.class = Class;
1751             if ((sym = lookup_struct_typedef (tmp,
1752                                               expression_context_block,
1753                                               1)))
1754               yylval.class.type = SYMBOL_TYPE (sym);
1755             return CLASSNAME;
1756           }
1757       }
1758
1759     /* Input names that aren't symbols but ARE valid hex numbers,
1760        when the input radix permits them, can be names or numbers
1761        depending on the parse.  Note we support radixes > 16 here.  */
1762     if (!sym &&
1763         ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1764          (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1765       {
1766         YYSTYPE newlval;        /* Its value is ignored.  */
1767         hextype = parse_number (tokstart, namelen, 0, &newlval);
1768         if (hextype == INT)
1769           {
1770             yylval.ssym.sym = sym;
1771             yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1772             return NAME_OR_INT;
1773           }
1774       }
1775
1776     /* Any other kind of symbol.  */
1777     yylval.ssym.sym = sym;
1778     yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1779     return NAME;
1780   }
1781 }
1782
1783 void
1784 yyerror (msg)
1785      char *msg;
1786 {
1787   if (*lexptr == '\0')
1788     error("A %s near end of expression.",  (msg ? msg : "error"));
1789   else
1790     error ("A %s in expression, near `%s'.", (msg ? msg : "error"),
1791            lexptr);
1792 }