gdb/objc-exp.y

   1 /* YACC parser for C expressions, for GDB.
   2
   3    Copyright 1986, 1989, 1990, 1991, 1993, 1994, 2002 Free Software
   4    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., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, 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
  56 /* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
  57    etc), as well as gratuitiously global symbol names, so we can have
  58    multiple yacc generated parsers in gdb.  Note that these are only
  59    the variables produced by yacc.  If other parser generators (bison,
  60    byacc, etc) produce additional global names that conflict at link
  61    time, then those parser generators need to be fixed instead of
  62    adding those names to this list.  */
  63
  64 #define yymaxdepth      objc_maxdepth
  65 #define yyparse         objc_parse
  66 #define yylex           objc_lex
  67 #define yyerror         objc_error
  68 #define yylval          objc_lval
  69 #define yychar          objc_char
  70 #define yydebug         objc_debug
  71 #define yypact          objc_pact
  72 #define yyr1            objc_r1
  73 #define yyr2            objc_r2
  74 #define yydef           objc_def
  75 #define yychk           objc_chk
  76 #define yypgo           objc_pgo
  77 #define yyact           objc_act
  78 #define yyexca          objc_exca
  79 #define yyerrflag       objc_errflag
  80 #define yynerrs         objc_nerrs
  81 #define yyps            objc_ps
  82 #define yypv            objc_pv
  83 #define yys             objc_s
  84 #define yy_yys          objc_yys
  85 #define yystate         objc_state
  86 #define yytmp           objc_tmp
  87 #define yyv             objc_v
  88 #define yy_yyv          objc_yyv
  89 #define yyval           objc_val
  90 #define yylloc          objc_lloc
  91 #define yyreds          objc_reds               /* With YYDEBUG defined */
  92 #define yytoks          objc_toks               /* With YYDEBUG defined */
  93 #define yyname          objc_name               /* With YYDEBUG defined */
  94 #define yyrule          objc_rule               /* With YYDEBUG defined */
  95 #define yylhs           objc_yylhs
  96 #define yylen           objc_yylen
  97 #define yydefred        objc_yydefred
  98 #define yydgoto         objc_yydgoto
  99 #define yysindex        objc_yysindex
 100 #define yyrindex        objc_yyrindex
 101 #define yygindex        objc_yygindex
 102 #define yytable         objc_yytable
 103 #define yycheck         objc_yycheck
 104
 105 #ifndef YYDEBUG
 106 #define YYDEBUG 0               /* Default to no yydebug support.  */
 107 #endif
 108
 109 int
 110 yyparse PARAMS ((void));
 111
 112 static int
 113 yylex PARAMS ((void));
 114
 115 void
 116 yyerror PARAMS ((char *));
 117
 118 %}
 119
 120 /* Although the yacc "value" of an expression is not used,
 121    since the result is stored in the structure being created,
 122    other node types do have values.  */
 123
 124 %union
 125   {
 126     LONGEST lval;
 127     struct {
 128       LONGEST val;
 129       struct type *type;
 130     } typed_val_int;
 131     struct {
 132       DOUBLEST dval;
 133       struct type *type;
 134     } typed_val_float;
 135     struct symbol *sym;
 136     struct type *tval;
 137     struct stoken sval;
 138     struct ttype tsym;
 139     struct symtoken ssym;
 140     int voidval;
 141     struct block *bval;
 142     enum exp_opcode opcode;
 143     struct internalvar *ivar;
 144     struct objc_class_str class;
 145
 146     struct type **tvec;
 147     int *ivec;
 148   }
 149
 150 %{
 151 /* YYSTYPE gets defined by %union.  */
 152 static int
 153 parse_number PARAMS ((char *, int, int, YYSTYPE *));
 154 %}
 155
 156 %type <voidval> exp exp1 type_exp start variable qualified_name lcurly
 157 %type <lval> rcurly
 158 %type <tval> type typebase
 159 %type <tvec> nonempty_typelist
 160 /* %type <bval> block */
 161
 162 /* Fancy type parsing.  */
 163 %type <voidval> func_mod direct_abs_decl abs_decl
 164 %type <tval> ptype
 165 %type <lval> array_mod
 166
 167 %token <typed_val_int> INT
 168 %token <typed_val_float> FLOAT
 169
 170 /* Both NAME and TYPENAME tokens represent symbols in the input, and
 171    both convey their data as strings.  But a TYPENAME is a string that
 172    happens to be defined as a typedef or builtin type name (such as
 173    int or char) and a NAME is any other symbol.  Contexts where this
 174    distinction is not important can use the nonterminal "name", which
 175    matches either NAME or TYPENAME.  */
 176
 177 %token <sval> STRING
 178 %token <sval> NSSTRING          /* ObjC Foundation "NSString" literal */
 179 %token <sval> SELECTOR          /* ObjC "@selector" pseudo-operator   */
 180 %token <ssym> NAME /* BLOCKNAME defined below to give it higher precedence. */
 181 %token <tsym> TYPENAME
 182 %token <class> CLASSNAME        /* ObjC Class name */
 183 %type <sval> name
 184 %type <ssym> name_not_typename
 185 %type <tsym> typename
 186
 187 /* A NAME_OR_INT is a symbol which is not known in the symbol table,
 188    but which would parse as a valid number in the current input radix.
 189    E.g. "c" when input_radix==16.  Depending on the parse, it will be
 190    turned into a name or into a number.  */
 191
 192 %token <ssym> NAME_OR_INT
 193
 194 %token STRUCT CLASS UNION ENUM SIZEOF UNSIGNED COLONCOLON
 195 %token TEMPLATE
 196 %token ERROR
 197
 198 /* Special type cases, put in to allow the parser to distinguish
 199    different legal basetypes.  */
 200 %token SIGNED_KEYWORD LONG SHORT INT_KEYWORD CONST_KEYWORD VOLATILE_KEYWORD DOUBLE_KEYWORD
 201
 202 %token <voidval> VARIABLE
 203
 204 %token <opcode> ASSIGN_MODIFY
 205
 206 /* C++ */
 207 %token THIS
 208
 209 %left ','
 210 %left ABOVE_COMMA
 211 %right '=' ASSIGN_MODIFY
 212 %right '?'
 213 %left OROR
 214 %left ANDAND
 215 %left '|'
 216 %left '^'
 217 %left '&'
 218 %left EQUAL NOTEQUAL
 219 %left '<' '>' LEQ GEQ
 220 %left LSH RSH
 221 %left '@'
 222 %left '+' '-'
 223 %left '*' '/' '%'
 224 %right UNARY INCREMENT DECREMENT
 225 %right ARROW '.' '[' '('
 226 %token <ssym> BLOCKNAME
 227 %type <bval> block
 228 %left COLONCOLON
 229
 230 \f
 231 %%
 232
 233 start   :       exp1
 234         |       type_exp
 235         ;
 236
 237 type_exp:       type
 238                         { write_exp_elt_opcode(OP_TYPE);
 239                           write_exp_elt_type($1);
 240                           write_exp_elt_opcode(OP_TYPE);}
 241         ;
 242
 243 /* Expressions, including the comma operator.  */
 244 exp1    :       exp
 245         |       exp1 ',' exp
 246                         { write_exp_elt_opcode (BINOP_COMMA); }
 247         ;
 248
 249 /* Expressions, not including the comma operator.  */
 250 exp     :       '*' exp    %prec UNARY
 251                         { write_exp_elt_opcode (UNOP_IND); }
 252
 253 exp     :       '&' exp    %prec UNARY
 254                         { write_exp_elt_opcode (UNOP_ADDR); }
 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_MSGCALL);
 348                           end_msglist();
 349                           write_exp_elt_opcode (OP_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_MSGCALL);
 363                           end_msglist();
 364                           write_exp_elt_opcode (OP_MSGCALL);
 365                         }
 366         ;
 367
 368 exp     :       '[' exp
 369                         { start_msglist(); }
 370                 msglist ']'
 371                         { write_exp_elt_opcode (OP_MSGCALL);
 372                           end_msglist();
 373                           write_exp_elt_opcode (OP_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_SELECTOR);
 572                           write_exp_string ($1);
 573                           write_exp_elt_opcode (OP_SELECTOR); }
 574
 575 exp     :       SIZEOF '(' type ')'     %prec UNARY
 576                         { write_exp_elt_opcode (OP_LONG);
 577                           write_exp_elt_type (builtin_type_int);
 578                           CHECK_TYPEDEF ($3);
 579                           write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
 580                           write_exp_elt_opcode (OP_LONG); }
 581         ;
 582
 583 exp     :       STRING
 584                         { /* C strings are converted into array
 585                              constants with an explicit null byte
 586                              added at the end.  Thus the array upper
 587                              bound is the string length.  There is no
 588                              such thing in C as a completely empty
 589                              string.  */
 590                           char *sp = $1.ptr; int count = $1.length;
 591                           while (count-- > 0)
 592                             {
 593                               write_exp_elt_opcode (OP_LONG);
 594                               write_exp_elt_type (builtin_type_char);
 595                               write_exp_elt_longcst ((LONGEST)(*sp++));
 596                               write_exp_elt_opcode (OP_LONG);
 597                             }
 598                           write_exp_elt_opcode (OP_LONG);
 599                           write_exp_elt_type (builtin_type_char);
 600                           write_exp_elt_longcst ((LONGEST)'\0');
 601                           write_exp_elt_opcode (OP_LONG);
 602                           write_exp_elt_opcode (OP_ARRAY);
 603                           write_exp_elt_longcst ((LONGEST) 0);
 604                           write_exp_elt_longcst ((LONGEST) ($1.length));
 605                           write_exp_elt_opcode (OP_ARRAY); }
 606         ;
 607
 608 exp     :       NSSTRING        /* ObjC NextStep NSString constant
 609                                  * of the form '@' '"' string '"'.
 610                                  */
 611                         { write_exp_elt_opcode (OP_NSSTRING);
 612                           write_exp_string ($1);
 613                           write_exp_elt_opcode (OP_NSSTRING); }
 614         ;
 615
 616 /* C++.  */
 617 exp     :       THIS
 618                         { write_exp_elt_opcode (OP_THIS);
 619                           write_exp_elt_opcode (OP_THIS); }
 620         ;
 621
 622 /* end of C++.  */
 623
 624 block   :       BLOCKNAME
 625                         {
 626                           if ($1.sym != 0)
 627                               $$ = SYMBOL_BLOCK_VALUE ($1.sym);
 628                           else
 629                             {
 630                               struct symtab *tem =
 631                                   lookup_symtab (copy_name ($1.stoken));
 632                               if (tem)
 633                                 $$ = BLOCKVECTOR_BLOCK (BLOCKVECTOR (tem), STATIC_BLOCK);
 634                               else
 635                                 error ("No file or function \"%s\".",
 636                                        copy_name ($1.stoken));
 637                             }
 638                         }
 639         ;
 640
 641 block   :       block COLONCOLON name
 642                         { struct symbol *tem
 643                             = lookup_symbol (copy_name ($3), $1,
 644                                              VAR_NAMESPACE, (int *) NULL,
 645                                              (struct symtab **) NULL);
 646                           if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
 647                             error ("No function \"%s\" in specified context.",
 648                                    copy_name ($3));
 649                           $$ = SYMBOL_BLOCK_VALUE (tem); }
 650         ;
 651
 652 variable:       block COLONCOLON name
 653                         { struct symbol *sym;
 654                           sym = lookup_symbol (copy_name ($3), $1,
 655                                                VAR_NAMESPACE, (int *) NULL,
 656                                                (struct symtab **) NULL);
 657                           if (sym == 0)
 658                             error ("No symbol \"%s\" in specified context.",
 659                                    copy_name ($3));
 660
 661                           write_exp_elt_opcode (OP_VAR_VALUE);
 662                           /* block_found is set by lookup_symbol.  */
 663                           write_exp_elt_block (block_found);
 664                           write_exp_elt_sym (sym);
 665                           write_exp_elt_opcode (OP_VAR_VALUE); }
 666         ;
 667
 668 qualified_name: typebase COLONCOLON name
 669                         {
 670                           struct type *type = $1;
 671                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 672                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 673                             error ("`%s' is not defined as an aggregate type.",
 674                                    TYPE_NAME (type));
 675
 676                           write_exp_elt_opcode (OP_SCOPE);
 677                           write_exp_elt_type (type);
 678                           write_exp_string ($3);
 679                           write_exp_elt_opcode (OP_SCOPE);
 680                         }
 681         |       typebase COLONCOLON '~' name
 682                         {
 683                           struct type *type = $1;
 684                           struct stoken tmp_token;
 685                           if (TYPE_CODE (type) != TYPE_CODE_STRUCT
 686                               && TYPE_CODE (type) != TYPE_CODE_UNION)
 687                             error ("`%s' is not defined as an aggregate type.",
 688                                    TYPE_NAME (type));
 689
 690                           if (!STREQ (type_name_no_tag (type), $4.ptr))
 691                             error ("invalid destructor `%s::~%s'",
 692                                    type_name_no_tag (type), $4.ptr);
 693
 694                           tmp_token.ptr = (char*) alloca ($4.length + 2);
 695                           tmp_token.length = $4.length + 1;
 696                           tmp_token.ptr[0] = '~';
 697                           memcpy (tmp_token.ptr+1, $4.ptr, $4.length);
 698                           tmp_token.ptr[tmp_token.length] = 0;
 699                           write_exp_elt_opcode (OP_SCOPE);
 700                           write_exp_elt_type (type);
 701                           write_exp_string (tmp_token);
 702                           write_exp_elt_opcode (OP_SCOPE);
 703                         }
 704         ;
 705
 706 variable:       qualified_name
 707         |       COLONCOLON name
 708                         {
 709                           char *name = copy_name ($2);
 710                           struct symbol *sym;
 711                           struct minimal_symbol *msymbol;
 712
 713                           sym =
 714                             lookup_symbol (name, (const struct block *) NULL,
 715                                            VAR_NAMESPACE, (int *) NULL,
 716                                            (struct symtab **) NULL);
 717                           if (sym)
 718                             {
 719                               write_exp_elt_opcode (OP_VAR_VALUE);
 720                               write_exp_elt_block (NULL);
 721                               write_exp_elt_sym (sym);
 722                               write_exp_elt_opcode (OP_VAR_VALUE);
 723                               break;
 724                             }
 725
 726                           msymbol = lookup_minimal_symbol (name, NULL, NULL);
 727                           if (msymbol != NULL)
 728                             {
 729                               write_exp_msymbol (msymbol,
 730                                                  lookup_function_type (builtin_type_int),
 731                                                  builtin_type_int);
 732                             }
 733                           else
 734                             if (!have_full_symbols () && !have_partial_symbols ())
 735                               error ("No symbol table is loaded.  Use the \"file\" command.");
 736                             else
 737                               error ("No symbol \"%s\" in current context.", name);
 738                         }
 739         ;
 740
 741 variable:       name_not_typename
 742                         { struct symbol *sym = $1.sym;
 743
 744                           if (sym)
 745                             {
 746                               if (symbol_read_needs_frame (sym))
 747                                 {
 748                                   if (innermost_block == 0 ||
 749                                       contained_in (block_found,
 750                                                     innermost_block))
 751                                     innermost_block = block_found;
 752                                 }
 753
 754                               write_exp_elt_opcode (OP_VAR_VALUE);
 755                               /* We want to use the selected frame, not
 756                                  another more inner frame which happens to
 757                                  be in the same block.  */
 758                               write_exp_elt_block (NULL);
 759                               write_exp_elt_sym (sym);
 760                               write_exp_elt_opcode (OP_VAR_VALUE);
 761                             }
 762                           else if ($1.is_a_field_of_this)
 763                             {
 764                               /* C++/ObjC: it hangs off of `this'/'self'.
 765                                  Must not inadvertently convert from a
 766                                  method call to data ref.  */
 767                               if (innermost_block == 0 ||
 768                                   contained_in (block_found, innermost_block))
 769                                 innermost_block = block_found;
 770                               write_exp_elt_opcode (OP_SELF);
 771                               write_exp_elt_opcode (OP_SELF);
 772                               write_exp_elt_opcode (STRUCTOP_PTR);
 773                               write_exp_string ($1.stoken);
 774                               write_exp_elt_opcode (STRUCTOP_PTR);
 775                             }
 776                           else
 777                             {
 778                               struct minimal_symbol *msymbol;
 779                               register char *arg = copy_name ($1.stoken);
 780
 781                               msymbol =
 782                                 lookup_minimal_symbol (arg, NULL, NULL);
 783                               if (msymbol != NULL)
 784                                 {
 785                                   write_exp_msymbol (msymbol,
 786                                                      lookup_function_type (builtin_type_int),
 787                                                      builtin_type_int);
 788                                 }
 789                               else if (!have_full_symbols () &&
 790                                        !have_partial_symbols ())
 791                                 error ("No symbol table is loaded.  Use the \"file\" command.");
 792                               else
 793                                 error ("No symbol \"%s\" in current context.",
 794                                        copy_name ($1.stoken));
 795                             }
 796                         }
 797         ;
 798
 799
 800 ptype   :       typebase
 801         /* "const" and "volatile" are curently ignored.  A type
 802            qualifier before the type is currently handled in the
 803            typebase rule.  The reason for recognizing these here
 804            (shift/reduce conflicts) might be obsolete now that some
 805            pointer to member rules have been deleted.  */
 806         |       typebase CONST_KEYWORD
 807         |       typebase VOLATILE_KEYWORD
 808         |       typebase abs_decl
 809                 { $$ = follow_types ($1); }
 810         |       typebase CONST_KEYWORD abs_decl
 811                 { $$ = follow_types ($1); }
 812         |       typebase VOLATILE_KEYWORD abs_decl
 813                 { $$ = follow_types ($1); }
 814         ;
 815
 816 abs_decl:       '*'
 817                         { push_type (tp_pointer); $$ = 0; }
 818         |       '*' abs_decl
 819                         { push_type (tp_pointer); $$ = $2; }
 820         |       '&'
 821                         { push_type (tp_reference); $$ = 0; }
 822         |       '&' abs_decl
 823                         { push_type (tp_reference); $$ = $2; }
 824         |       direct_abs_decl
 825         ;
 826
 827 direct_abs_decl: '(' abs_decl ')'
 828                         { $$ = $2; }
 829         |       direct_abs_decl array_mod
 830                         {
 831                           push_type_int ($2);
 832                           push_type (tp_array);
 833                         }
 834         |       array_mod
 835                         {
 836                           push_type_int ($1);
 837                           push_type (tp_array);
 838                           $$ = 0;
 839                         }
 840
 841         |       direct_abs_decl func_mod
 842                         { push_type (tp_function); }
 843         |       func_mod
 844                         { push_type (tp_function); }
 845         ;
 846
 847 array_mod:      '[' ']'
 848                         { $$ = -1; }
 849         |       '[' INT ']'
 850                         { $$ = $2.val; }
 851         ;
 852
 853 func_mod:       '(' ')'
 854                         { $$ = 0; }
 855         |       '(' nonempty_typelist ')'
 856                         { free ((PTR)$2); $$ = 0; }
 857         ;
 858
 859 /* We used to try to recognize more pointer to member types here, but
 860    that didn't work (shift/reduce conflicts meant that these rules
 861    never got executed).  The problem is that
 862      int (foo::bar::baz::bizzle)
 863    is a function type but
 864      int (foo::bar::baz::bizzle::*)
 865    is a pointer to member type.  Stroustrup loses again!  */
 866
 867 type    :       ptype
 868         |       typebase COLONCOLON '*'
 869                         { $$ = lookup_member_type (builtin_type_int, $1); }
 870         ;
 871
 872 typebase  /* Implements (approximately): (type-qualifier)* type-specifier.  */
 873         :       TYPENAME
 874                         { $$ = $1.type; }
 875         |       CLASSNAME
 876                         {
 877                           if ($1.type == NULL)
 878                             error ("No symbol \"%s\" in current context.",
 879                                    copy_name($1.stoken));
 880                           else
 881                             $$ = $1.type;
 882                         }
 883         |       INT_KEYWORD
 884                         { $$ = builtin_type_int; }
 885         |       LONG
 886                         { $$ = builtin_type_long; }
 887         |       SHORT
 888                         { $$ = builtin_type_short; }
 889         |       LONG INT_KEYWORD
 890                         { $$ = builtin_type_long; }
 891         |       UNSIGNED LONG INT_KEYWORD
 892                         { $$ = builtin_type_unsigned_long; }
 893         |       LONG LONG
 894                         { $$ = builtin_type_long_long; }
 895         |       LONG LONG INT_KEYWORD
 896                         { $$ = builtin_type_long_long; }
 897         |       UNSIGNED LONG LONG
 898                         { $$ = builtin_type_unsigned_long_long; }
 899         |       UNSIGNED LONG LONG INT_KEYWORD
 900                         { $$ = builtin_type_unsigned_long_long; }
 901         |       SHORT INT_KEYWORD
 902                         { $$ = builtin_type_short; }
 903         |       UNSIGNED SHORT INT_KEYWORD
 904                         { $$ = builtin_type_unsigned_short; }
 905         |       DOUBLE_KEYWORD
 906                         { $$ = builtin_type_double; }
 907         |       LONG DOUBLE_KEYWORD
 908                         { $$ = builtin_type_long_double; }
 909         |       STRUCT name
 910                         { $$ = lookup_struct (copy_name ($2),
 911                                               expression_context_block); }
 912         |       CLASS name
 913                         { $$ = lookup_struct (copy_name ($2),
 914                                               expression_context_block); }
 915         |       UNION name
 916                         { $$ = lookup_union (copy_name ($2),
 917                                              expression_context_block); }
 918         |       ENUM name
 919                         { $$ = lookup_enum (copy_name ($2),
 920                                             expression_context_block); }
 921         |       UNSIGNED typename
 922                         { $$ = lookup_unsigned_typename (TYPE_NAME($2.type)); }
 923         |       UNSIGNED
 924                         { $$ = builtin_type_unsigned_int; }
 925         |       SIGNED_KEYWORD typename
 926                         { $$ = lookup_signed_typename (TYPE_NAME($2.type)); }
 927         |       SIGNED_KEYWORD
 928                         { $$ = builtin_type_int; }
 929         |       TEMPLATE name '<' type '>'
 930                         { $$ = lookup_template_type(copy_name($2), $4,
 931                                                     expression_context_block);
 932                         }
 933         /* "const" and "volatile" are curently ignored.  A type
 934            qualifier after the type is handled in the ptype rule.  I
 935            think these could be too.  */
 936         |       CONST_KEYWORD typebase { $$ = $2; }
 937         |       VOLATILE_KEYWORD typebase { $$ = $2; }
 938         ;
 939
 940 typename:       TYPENAME
 941         |       INT_KEYWORD
 942                 {
 943                   $$.stoken.ptr = "int";
 944                   $$.stoken.length = 3;
 945                   $$.type = builtin_type_int;
 946                 }
 947         |       LONG
 948                 {
 949                   $$.stoken.ptr = "long";
 950                   $$.stoken.length = 4;
 951                   $$.type = builtin_type_long;
 952                 }
 953         |       SHORT
 954                 {
 955                   $$.stoken.ptr = "short";
 956                   $$.stoken.length = 5;
 957                   $$.type = builtin_type_short;
 958                 }
 959         ;
 960
 961 nonempty_typelist
 962         :       type
 963                 { $$ = (struct type **) malloc (sizeof (struct type *) * 2);
 964                   $<ivec>$[0] = 1;      /* Number of types in vector.  */
 965                   $$[1] = $1;
 966                 }
 967         |       nonempty_typelist ',' type
 968                 { int len = sizeof (struct type *) * (++($<ivec>1[0]) + 1);
 969                   $$ = (struct type **) realloc ((char *) $1, len);
 970                   $$[$<ivec>$[0]] = $3;
 971                 }
 972         ;
 973
 974 name    :       NAME        { $$ = $1.stoken; }
 975         |       BLOCKNAME   { $$ = $1.stoken; }
 976         |       TYPENAME    { $$ = $1.stoken; }
 977         |       CLASSNAME   { $$ = $1.stoken; }
 978         |       NAME_OR_INT { $$ = $1.stoken; }
 979         ;
 980
 981 name_not_typename :     NAME
 982         |       BLOCKNAME
 983 /* These would be useful if name_not_typename was useful, but it is
 984    just a fake for "variable", so these cause reduce/reduce conflicts
 985    because the parser can't tell whether NAME_OR_INT is a
 986    name_not_typename (=variable, =exp) or just an exp.  If
 987    name_not_typename was ever used in an lvalue context where only a
 988    name could occur, this might be useful.  */
 989         | NAME_OR_INT */
 990         ;
 991
 992 %%
 993
 994 /* Take care of parsing a number (anything that starts with a digit).
 995    Set yylval and return the token type; update lexptr.  LEN is the
 996    number of characters in it.  */
 997
 998 /*** Needs some error checking for the float case.  ***/
 999
1000 static int
1001 parse_number (p, len, parsed_float, putithere)
1002      register char *p;
1003      register int len;
1004      int parsed_float;
1005      YYSTYPE *putithere;
1006 {
1007   /* FIXME: Shouldn't these be unsigned?  We don't deal with negative
1008      values here, and we do kind of silly things like cast to
1009      unsigned.  */
1010   register LONGEST n = 0;
1011   register LONGEST prevn = 0;
1012   unsigned LONGEST un;
1013
1014   register int i = 0;
1015   register int c;
1016   register int base = input_radix;
1017   int unsigned_p = 0;
1018
1019   /* Number of "L" suffixes encountered.  */
1020   int long_p = 0;
1021
1022   /* We have found a "L" or "U" suffix.  */
1023   int found_suffix = 0;
1024
1025   unsigned LONGEST high_bit;
1026   struct type *signed_type;
1027   struct type *unsigned_type;
1028
1029   if (parsed_float)
1030     {
1031       char c;
1032
1033       /* It's a float since it contains a point or an exponent.  */
1034
1035       if (sizeof (putithere->typed_val_float.dval) <= sizeof (float))
1036         sscanf (p, "%g", &putithere->typed_val_float.dval);
1037       else if (sizeof (putithere->typed_val_float.dval) <= sizeof (double))
1038         sscanf (p, "%lg", &putithere->typed_val_float.dval);
1039       else
1040         {
1041 #ifdef PRINTF_HAS_LONG_DOUBLE
1042           sscanf (p, "%Lg", &putithere->typed_val_float.dval);
1043 #else
1044           /* Scan it into a double, then assign it to the long double.
1045              This at least wins with values representable in the range
1046              of doubles.  */
1047           double temp;
1048           sscanf (p, "%lg", &temp);
1049           putithere->typed_val_float.dval = temp;
1050 #endif
1051         }
1052
1053       /* See if it has `f' or `l' suffix (float or long double).  */
1054
1055       c = tolower (p[len - 1]);
1056
1057       if (c == 'f')
1058         putithere->typed_val_float.type = builtin_type_float;
1059       else if (c == 'l')
1060         putithere->typed_val_float.type = builtin_type_long_double;
1061       else if (isdigit (c) || c == '.')
1062         putithere->typed_val_float.type = builtin_type_double;
1063       else
1064         return ERROR;
1065
1066       return FLOAT;
1067     }
1068
1069   /* Handle base-switching prefixes 0x, 0t, 0d, and 0.  */
1070   if (p[0] == '0')
1071     switch (p[1])
1072       {
1073       case 'x':
1074       case 'X':
1075         if (len >= 3)
1076           {
1077             p += 2;
1078             base = 16;
1079             len -= 2;
1080           }
1081         break;
1082
1083       case 't':
1084       case 'T':
1085       case 'd':
1086       case 'D':
1087         if (len >= 3)
1088           {
1089             p += 2;
1090             base = 10;
1091             len -= 2;
1092           }
1093         break;
1094
1095       default:
1096         base = 8;
1097         break;
1098       }
1099
1100   while (len-- > 0)
1101     {
1102       c = *p++;
1103       if (c >= 'A' && c <= 'Z')
1104         c += 'a' - 'A';
1105       if (c != 'l' && c != 'u')
1106         n *= base;
1107       if (c >= '0' && c <= '9')
1108         {
1109           if (found_suffix)
1110             return ERROR;
1111           n += i = c - '0';
1112         }
1113       else
1114         {
1115           if (base > 10 && c >= 'a' && c <= 'f')
1116             {
1117               if (found_suffix)
1118                 return ERROR;
1119               n += i = c - 'a' + 10;
1120             }
1121           else if (c == 'l')
1122             {
1123               ++long_p;
1124               found_suffix = 1;
1125             }
1126           else if (c == 'u')
1127             {
1128               unsigned_p = 1;
1129               found_suffix = 1;
1130             }
1131           else
1132             return ERROR;       /* Char not a digit.  */
1133         }
1134       if (i >= base)
1135         return ERROR;           /* Invalid digit in this base.  */
1136
1137       /* Portably test for overflow (only works for nonzero values, so
1138          make a second check for zero).  FIXME: Can't we just make n
1139          and prevn unsigned and avoid this?  */
1140       if (c != 'l' && c != 'u' && (prevn >= n) && n != 0)
1141         unsigned_p = 1;         /* Try something unsigned.  */
1142
1143       /* Portably test for unsigned overflow.
1144          FIXME: This check is wrong; for example it doesn't find
1145          overflow on 0x123456789 when LONGEST is 32 bits.  */
1146       if (c != 'l' && c != 'u' && n != 0)
1147         {
1148           if ((unsigned_p && (unsigned LONGEST) prevn >= (unsigned LONGEST) n))
1149             error ("Numeric constant too large.");
1150         }
1151       prevn = n;
1152     }
1153
1154   /* An integer constant is an int, a long, or a long long.  An L
1155      suffix forces it to be long; an LL suffix forces it to be long
1156      long.  If not forced to a larger size, it gets the first type of
1157      the above that it fits in.  To figure out whether it fits, we
1158      shift it right and see whether anything remains.  Note that we
1159      can't shift sizeof (LONGEST) * HOST_CHAR_BIT bits or more in one
1160      operation, because many compilers will warn about such a shift
1161      (which always produces a zero result).  Sometimes TARGET_INT_BIT
1162      or TARGET_LONG_BIT will be that big, sometimes not.  To deal with
1163      the case where it is we just always shift the value more than
1164      once, with fewer bits each time.  */
1165
1166   un = (unsigned LONGEST)n >> 2;
1167   if (long_p == 0
1168       && (un >> (TARGET_INT_BIT - 2)) == 0)
1169     {
1170       high_bit = ((unsigned LONGEST)1) << (TARGET_INT_BIT-1);
1171
1172       /* A large decimal (not hex or octal) constant (between INT_MAX
1173          and UINT_MAX) is a long or unsigned long, according to ANSI,
1174          never an unsigned int, but this code treats it as unsigned
1175          int.  This probably should be fixed.  GCC gives a warning on
1176          such constants.  */
1177
1178       unsigned_type = builtin_type_unsigned_int;
1179       signed_type = builtin_type_int;
1180     }
1181   else if (long_p <= 1
1182            && (un >> (TARGET_LONG_BIT - 2)) == 0)
1183     {
1184       high_bit = ((unsigned LONGEST)1) << (TARGET_LONG_BIT-1);
1185       unsigned_type = builtin_type_unsigned_long;
1186       signed_type = builtin_type_long;
1187     }
1188   else
1189     {
1190       high_bit = (((unsigned LONGEST)1)
1191                   << (TARGET_LONG_LONG_BIT - 32 - 1)
1192                   << 16
1193                   << 16);
1194       if (high_bit == 0)
1195         /* A long long does not fit in a LONGEST.  */
1196         high_bit =
1197           (unsigned LONGEST)1 << (sizeof (LONGEST) * HOST_CHAR_BIT - 1);
1198       unsigned_type = builtin_type_unsigned_long_long;
1199       signed_type = builtin_type_long_long;
1200     }
1201
1202    putithere->typed_val_int.val = n;
1203
1204    /* If the high bit of the worked out type is set then this number
1205       has to be unsigned.  */
1206
1207    if (unsigned_p || (n & high_bit))
1208      {
1209        putithere->typed_val_int.type = unsigned_type;
1210      }
1211    else
1212      {
1213        putithere->typed_val_int.type = signed_type;
1214      }
1215
1216    return INT;
1217 }
1218
1219 struct token
1220 {
1221   char *operator;
1222   int token;
1223   enum exp_opcode opcode;
1224 };
1225
1226 static const struct token tokentab3[] =
1227   {
1228     {">>=", ASSIGN_MODIFY, BINOP_RSH},
1229     {"<<=", ASSIGN_MODIFY, BINOP_LSH}
1230   };
1231
1232 static const struct token tokentab2[] =
1233   {
1234     {"+=", ASSIGN_MODIFY, BINOP_ADD},
1235     {"-=", ASSIGN_MODIFY, BINOP_SUB},
1236     {"*=", ASSIGN_MODIFY, BINOP_MUL},
1237     {"/=", ASSIGN_MODIFY, BINOP_DIV},
1238     {"%=", ASSIGN_MODIFY, BINOP_REM},
1239     {"|=", ASSIGN_MODIFY, BINOP_BITWISE_IOR},
1240     {"&=", ASSIGN_MODIFY, BINOP_BITWISE_AND},
1241     {"^=", ASSIGN_MODIFY, BINOP_BITWISE_XOR},
1242     {"++", INCREMENT, BINOP_END},
1243     {"--", DECREMENT, BINOP_END},
1244     {"->", ARROW, BINOP_END},
1245     {"&&", ANDAND, BINOP_END},
1246     {"||", OROR, BINOP_END},
1247     {"::", COLONCOLON, BINOP_END},
1248     {"<<", LSH, BINOP_END},
1249     {">>", RSH, BINOP_END},
1250     {"==", EQUAL, BINOP_END},
1251     {"!=", NOTEQUAL, BINOP_END},
1252     {"<=", LEQ, BINOP_END},
1253     {">=", GEQ, BINOP_END}
1254   };
1255
1256 /* Read one token, getting characters through lexptr.  */
1257
1258 static int
1259 yylex ()
1260 {
1261   int c, tokchr;
1262   int namelen;
1263   unsigned int i;
1264   char *tokstart;
1265   char *tokptr;
1266   int tempbufindex;
1267   static char *tempbuf;
1268   static int tempbufsize;
1269
1270  retry:
1271
1272   tokstart = lexptr;
1273   /* See if it is a special token of length 3.  */
1274   for (i = 0; i < sizeof tokentab3 / sizeof tokentab3[0]; i++)
1275     if (STREQN (tokstart, tokentab3[i].operator, 3))
1276       {
1277         lexptr += 3;
1278         yylval.opcode = tokentab3[i].opcode;
1279         return tokentab3[i].token;
1280       }
1281
1282   /* See if it is a special token of length 2.  */
1283   for (i = 0; i < sizeof tokentab2 / sizeof tokentab2[0]; i++)
1284     if (STREQN (tokstart, tokentab2[i].operator, 2))
1285       {
1286         lexptr += 2;
1287         yylval.opcode = tokentab2[i].opcode;
1288         return tokentab2[i].token;
1289       }
1290
1291   switch (tokchr = *tokstart)
1292     {
1293     case 0:
1294       return 0;
1295
1296     case ' ':
1297     case '\t':
1298     case '\n':
1299       lexptr++;
1300       goto retry;
1301
1302     case '\'':
1303       /* We either have a character constant ('0' or '\177' for
1304          example) or we have a quoted symbol reference ('foo(int,int)'
1305          in C++ for example).  */
1306       lexptr++;
1307       c = *lexptr++;
1308       if (c == '\\')
1309         c = parse_escape (&lexptr);
1310       else if (c == '\'')
1311         error ("Empty character constant.");
1312
1313       yylval.typed_val_int.val = c;
1314       yylval.typed_val_int.type = builtin_type_char;
1315
1316       c = *lexptr++;
1317       if (c != '\'')
1318         {
1319           namelen = skip_quoted (tokstart,
1320                                  get_gdb_completer_word_break_characters())
1321             - tokstart;
1322           if (namelen > 2)
1323             {
1324               lexptr = tokstart + namelen;
1325               if (lexptr[-1] != '\'')
1326                 error ("Unmatched single quote.");
1327               namelen -= 2;
1328               tokstart++;
1329               goto tryname;
1330             }
1331           error ("Invalid character constant.");
1332         }
1333       return INT;
1334
1335     case '(':
1336       paren_depth++;
1337       lexptr++;
1338       return '(';
1339
1340     case ')':
1341       if (paren_depth == 0)
1342         return 0;
1343       paren_depth--;
1344       lexptr++;
1345       return ')';
1346
1347     case ',':
1348       if (comma_terminates && paren_depth == 0)
1349         return 0;
1350       lexptr++;
1351       return ',';
1352
1353     case '.':
1354       /* Might be a floating point number.  */
1355       if (lexptr[1] < '0' || lexptr[1] > '9')
1356         goto symbol;            /* Nope, must be a symbol.  */
1357       /* FALL THRU into number case.  */
1358
1359     case '0':
1360     case '1':
1361     case '2':
1362     case '3':
1363     case '4':
1364     case '5':
1365     case '6':
1366     case '7':
1367     case '8':
1368     case '9':
1369       {
1370         /* It's a number.  */
1371         int got_dot = 0, got_e = 0, toktype = FLOAT;
1372         /* Initialize toktype to anything other than ERROR.  */
1373         register char *p = tokstart;
1374         int hex = input_radix > 10;
1375         int local_radix = input_radix;
1376         if (tokchr == '0' && (p[1] == 'x' || p[1] == 'X'))
1377           {
1378             p += 2;
1379             hex = 1;
1380             local_radix = 16;
1381           }
1382         else if (tokchr == '0' && (p[1]=='t' || p[1]=='T' || p[1]=='d' || p[1]=='D'))
1383           {
1384             p += 2;
1385             hex = 0;
1386             local_radix = 10;
1387           }
1388
1389         for (;; ++p)
1390           {
1391             /* This test includes !hex because 'e' is a valid hex digit
1392                and thus does not indicate a floating point number when
1393                the radix is hex.  */
1394
1395             if (!hex && (*p == 'e' || *p == 'E'))
1396               if (got_e)
1397                 toktype = ERROR;        /* Only one 'e' in a float.  */
1398               else
1399                 got_e = 1;
1400             /* This test does not include !hex, because a '.' always
1401                indicates a decimal floating point number regardless of
1402                the radix.  */
1403             else if (*p == '.')
1404               if (got_dot)
1405                 toktype = ERROR;        /* Only one '.' in a float.  */
1406               else
1407                 got_dot = 1;
1408             else if (got_e && (p[-1] == 'e' || p[-1] == 'E') &&
1409                     (*p == '-' || *p == '+'))
1410               /* This is the sign of the exponent, not the end of the
1411                  number.  */
1412               continue;
1413             /* Always take decimal digits; parse_number handles radix
1414                error.  */
1415             else if (*p >= '0' && *p <= '9')
1416               continue;
1417             /* We will take letters only if hex is true, and only up
1418                to what the input radix would permit.  FSF was content
1419                to rely on parse_number to validate; but it leaks.  */
1420             else if (*p >= 'a' && *p <= 'z')
1421               {
1422                 if (!hex || *p >= ('a' + local_radix - 10))
1423                   toktype = ERROR;
1424               }
1425             else if (*p >= 'A' && *p <= 'Z')
1426               {
1427                 if (!hex || *p >= ('A' + local_radix - 10))
1428                   toktype = ERROR;
1429               }
1430             else break;
1431           }
1432         if (toktype != ERROR)
1433           toktype = parse_number (tokstart, p - tokstart,
1434                                   got_dot | got_e, &yylval);
1435         if (toktype == ERROR)
1436           {
1437             char *err_copy = (char *) alloca (p - tokstart + 1);
1438
1439             memcpy (err_copy, tokstart, p - tokstart);
1440             err_copy[p - tokstart] = 0;
1441             error ("Invalid number \"%s\".", err_copy);
1442           }
1443         lexptr = p;
1444         return toktype;
1445       }
1446
1447     case '+':
1448     case '-':
1449     case '*':
1450     case '/':
1451     case '%':
1452     case '|':
1453     case '&':
1454     case '^':
1455     case '~':
1456     case '!':
1457 #if 0
1458     case '@':           /* Moved out below.  */
1459 #endif
1460     case '<':
1461     case '>':
1462     case '[':
1463     case ']':
1464     case '?':
1465     case ':':
1466     case '=':
1467     case '{':
1468     case '}':
1469     symbol:
1470       lexptr++;
1471       return tokchr;
1472
1473     case '@':
1474       if (strncmp(tokstart, "@selector", 9) == 0)
1475         {
1476           tokptr = strchr(tokstart, '(');
1477           if (tokptr == NULL)
1478             {
1479               error ("Missing '(' in @selector(...)");
1480             }
1481           tempbufindex = 0;
1482           tokptr++;     /* Skip the '('.  */
1483           do {
1484             /* Grow the static temp buffer if necessary, including
1485                allocating the first one on demand.  */
1486             if (tempbufindex + 1 >= tempbufsize)
1487               {
1488                 tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1489               }
1490             tempbuf[tempbufindex++] = *tokptr++;
1491           } while ((*tokptr != ')') && (*tokptr != '\0'));
1492           if (*tokptr++ != ')')
1493             {
1494               error ("Missing ')' in @selector(...)");
1495             }
1496           tempbuf[tempbufindex] = '\0';
1497           yylval.sval.ptr = tempbuf;
1498           yylval.sval.length = tempbufindex;
1499           lexptr = tokptr;
1500           return SELECTOR;
1501         }
1502       if (tokstart[1] != '"')
1503         {
1504           lexptr++;
1505           return tokchr;
1506         }
1507       /* ObjC NextStep NSString constant: fall thru and parse like
1508          STRING.  */
1509       tokstart++;
1510
1511     case '"':
1512
1513       /* Build the gdb internal form of the input string in tempbuf,
1514          translating any standard C escape forms seen.  Note that the
1515          buffer is null byte terminated *only* for the convenience of
1516          debugging gdb itself and printing the buffer contents when
1517          the buffer contains no embedded nulls.  Gdb does not depend
1518          upon the buffer being null byte terminated, it uses the
1519          length string instead.  This allows gdb to handle C strings
1520          (as well as strings in other languages) with embedded null
1521          bytes.  */
1522
1523       tokptr = ++tokstart;
1524       tempbufindex = 0;
1525
1526       do {
1527         /* Grow the static temp buffer if necessary, including
1528            allocating the first one on demand.  */
1529         if (tempbufindex + 1 >= tempbufsize)
1530           {
1531             tempbuf = (char *) realloc (tempbuf, tempbufsize += 64);
1532           }
1533         switch (*tokptr)
1534           {
1535           case '\0':
1536           case '"':
1537             /* Do nothing, loop will terminate.  */
1538             break;
1539           case '\\':
1540             tokptr++;
1541             c = parse_escape (&tokptr);
1542             if (c == -1)
1543               {
1544                 continue;
1545               }
1546             tempbuf[tempbufindex++] = c;
1547             break;
1548           default:
1549             tempbuf[tempbufindex++] = *tokptr++;
1550             break;
1551           }
1552       } while ((*tokptr != '"') && (*tokptr != '\0'));
1553       if (*tokptr++ != '"')
1554         {
1555           error ("Unterminated string in expression.");
1556         }
1557       tempbuf[tempbufindex] = '\0';     /* See note above.  */
1558       yylval.sval.ptr = tempbuf;
1559       yylval.sval.length = tempbufindex;
1560       lexptr = tokptr;
1561       return (tokchr == '@' ? NSSTRING : STRING);
1562     }
1563
1564   if (!(tokchr == '_' || tokchr == '$' ||
1565        (tokchr >= 'a' && tokchr <= 'z') || (tokchr >= 'A' && tokchr <= 'Z')))
1566     /* We must have come across a bad character (e.g. ';').  */
1567     error ("Invalid character '%c' in expression.", c);
1568
1569   /* It's a name.  See how long it is.  */
1570   namelen = 0;
1571   for (c = tokstart[namelen];
1572        (c == '_' || c == '$' || (c >= '0' && c <= '9')
1573         || (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '<');)
1574     {
1575        if (c == '<')
1576          {
1577            int i = namelen;
1578            while (tokstart[++i] && tokstart[i] != '>');
1579            if (tokstart[i] == '>')
1580              namelen = i;
1581           }
1582        c = tokstart[++namelen];
1583      }
1584
1585   /* The token "if" terminates the expression and is NOT
1586      removed from the input stream.  */
1587   if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
1588     {
1589       return 0;
1590     }
1591
1592   lexptr += namelen;
1593
1594   tryname:
1595
1596   /* Catch specific keywords.  Should be done with a data structure.  */
1597   switch (namelen)
1598     {
1599     case 8:
1600       if (STREQN (tokstart, "unsigned", 8))
1601         return UNSIGNED;
1602       if (current_language->la_language == language_cplus
1603           && STREQN (tokstart, "template", 8))
1604         return TEMPLATE;
1605       if (STREQN (tokstart, "volatile", 8))
1606         return VOLATILE_KEYWORD;
1607       break;
1608     case 6:
1609       if (STREQN (tokstart, "struct", 6))
1610         return STRUCT;
1611       if (STREQN (tokstart, "signed", 6))
1612         return SIGNED_KEYWORD;
1613       if (STREQN (tokstart, "sizeof", 6))
1614         return SIZEOF;
1615       if (STREQN (tokstart, "double", 6))
1616         return DOUBLE_KEYWORD;
1617       break;
1618     case 5:
1619       if ((current_language->la_language == language_cplus)
1620           && STREQN (tokstart, "class", 5))
1621         return CLASS;
1622       if (STREQN (tokstart, "union", 5))
1623         return UNION;
1624       if (STREQN (tokstart, "short", 5))
1625         return SHORT;
1626       if (STREQN (tokstart, "const", 5))
1627         return CONST_KEYWORD;
1628       break;
1629     case 4:
1630       if (STREQN (tokstart, "enum", 4))
1631         return ENUM;
1632       if (STREQN (tokstart, "long", 4))
1633         return LONG;
1634       if (current_language->la_language == language_cplus
1635           && STREQN (tokstart, "this", 4))
1636         {
1637           static const char this_name[] = {
1638             CPLUS_MARKER, 't', 'h', 'i', 's', '\0'
1639           };
1640
1641           if (lookup_symbol (this_name, expression_context_block,
1642                              VAR_NAMESPACE, (int *) NULL,
1643                              (struct symtab **) NULL))
1644             return THIS;
1645         }
1646       break;
1647     case 3:
1648       if (STREQN (tokstart, "int", 3))
1649         return INT_KEYWORD;
1650       break;
1651     default:
1652       break;
1653     }
1654
1655   yylval.sval.ptr = tokstart;
1656   yylval.sval.length = namelen;
1657
1658   if (*tokstart == '$')
1659     {
1660       write_dollar_variable (yylval.sval);
1661       return VARIABLE;
1662     }
1663
1664   /* Use token-type BLOCKNAME for symbols that happen to be defined as
1665      functions or symtabs.  If this is not so, then ...
1666      Use token-type TYPENAME for symbols that happen to be defined
1667      currently as names of types; NAME for other symbols.
1668      The caller is not constrained to care about the distinction.  */
1669   {
1670     char *tmp = copy_name (yylval.sval);
1671     struct symbol *sym;
1672     int is_a_field_of_this = 0, *need_this;
1673     int hextype;
1674
1675     if (current_language->la_language == language_cplus ||
1676         current_language->la_language == language_objc)
1677       need_this = &is_a_field_of_this;
1678     else
1679       need_this = (int *) NULL;
1680
1681     sym = lookup_symbol (tmp, expression_context_block,
1682                          VAR_NAMESPACE,
1683                          need_this,
1684                          (struct symtab **) NULL);
1685     /* Call lookup_symtab, not lookup_partial_symtab, in case there
1686        are no psymtabs (coff, xcoff, or some future change to blow
1687        away the psymtabs once symbols are read).  */
1688     if ((sym && SYMBOL_CLASS (sym) == LOC_BLOCK) ||
1689         lookup_symtab (tmp))
1690       {
1691         yylval.ssym.sym = sym;
1692         yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1693         return BLOCKNAME;
1694       }
1695     if (sym && SYMBOL_CLASS (sym) == LOC_TYPEDEF)
1696         {
1697 #if 1
1698           /* Despite the following flaw, we need to keep this code
1699              enabled.  Because we can get called from
1700              check_stub_method, if we don't handle nested types then
1701              it screws many operations in any program which uses
1702              nested types.  */
1703           /* In "A::x", if x is a member function of A and there
1704              happens to be a type (nested or not, since the stabs
1705              don't make that distinction) named x, then this code
1706              incorrectly thinks we are dealing with nested types
1707              rather than a member function.  */
1708
1709           char *p;
1710           char *namestart;
1711           struct symbol *best_sym;
1712
1713           /* Look ahead to detect nested types.  This probably should
1714              be done in the grammar, but trying seemed to introduce a
1715              lot of shift/reduce and reduce/reduce conflicts.  It's
1716              possible that it could be done, though.  Or perhaps a
1717              non-grammar, but less ad hoc, approach would work well.  */
1718
1719           /* Since we do not currently have any way of distinguishing
1720              a nested type from a non-nested one (the stabs don't tell
1721              us whether a type is nested), we just ignore the
1722              containing type.  */
1723
1724           p = lexptr;
1725           best_sym = sym;
1726           while (1)
1727             {
1728               /* Skip whitespace.  */
1729               while (*p == ' ' || *p == '\t' || *p == '\n')
1730                 ++p;
1731               if (*p == ':' && p[1] == ':')
1732                 {
1733                   /* Skip the `::'.  */
1734                   p += 2;
1735                   /* Skip whitespace.  */
1736                   while (*p == ' ' || *p == '\t' || *p == '\n')
1737                     ++p;
1738                   namestart = p;
1739                   while (*p == '_' || *p == '$' || (*p >= '0' && *p <= '9')
1740                          || (*p >= 'a' && *p <= 'z')
1741                          || (*p >= 'A' && *p <= 'Z'))
1742                     ++p;
1743                   if (p != namestart)
1744                     {
1745                       struct symbol *cur_sym;
1746                       /* As big as the whole rest of the expression,
1747                          which is at least big enough.  */
1748                       char *ncopy = alloca (strlen (tmp) +
1749                                             strlen (namestart) + 3);
1750                       char *tmp1;
1751
1752                       tmp1 = ncopy;
1753                       memcpy (tmp1, tmp, strlen (tmp));
1754                       tmp1 += strlen (tmp);
1755                       memcpy (tmp1, "::", 2);
1756                       tmp1 += 2;
1757                       memcpy (tmp1, namestart, p - namestart);
1758                       tmp1[p - namestart] = '\0';
1759                       cur_sym = lookup_symbol (ncopy,
1760                                                expression_context_block,
1761                                                VAR_NAMESPACE, (int *) NULL,
1762                                                (struct symtab **) NULL);
1763                       if (cur_sym)
1764                         {
1765                           if (SYMBOL_CLASS (cur_sym) == LOC_TYPEDEF)
1766                             {
1767                               best_sym = cur_sym;
1768                               lexptr = p;
1769                             }
1770                           else
1771                             break;
1772                         }
1773                       else
1774                         break;
1775                     }
1776                   else
1777                     break;
1778                 }
1779               else
1780                 break;
1781             }
1782
1783           yylval.tsym.type = SYMBOL_TYPE (best_sym);
1784 #else /* not 0 */
1785           yylval.tsym.type = SYMBOL_TYPE (sym);
1786 #endif /* not 0 */
1787           return TYPENAME;
1788         }
1789     if ((yylval.tsym.type = lookup_primitive_typename (tmp)) != 0)
1790         return TYPENAME;
1791
1792     /* See if it's an ObjC classname.  */
1793     if (!sym)
1794       {
1795         CORE_ADDR Class = lookup_objc_class(tmp);
1796         if (Class)
1797           {
1798             extern struct symbol *lookup_struct_typedef();
1799             yylval.class.class = Class;
1800             if ((sym = lookup_struct_typedef (tmp,
1801                                               expression_context_block,
1802                                               1)))
1803               yylval.class.type = SYMBOL_TYPE (sym);
1804             return CLASSNAME;
1805           }
1806       }
1807
1808     /* Input names that aren't symbols but ARE valid hex numbers,
1809        when the input radix permits them, can be names or numbers
1810        depending on the parse.  Note we support radixes > 16 here.  */
1811     if (!sym &&
1812         ((tokstart[0] >= 'a' && tokstart[0] < 'a' + input_radix - 10) ||
1813          (tokstart[0] >= 'A' && tokstart[0] < 'A' + input_radix - 10)))
1814       {
1815         YYSTYPE newlval;        /* Its value is ignored.  */
1816         hextype = parse_number (tokstart, namelen, 0, &newlval);
1817         if (hextype == INT)
1818           {
1819             yylval.ssym.sym = sym;
1820             yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1821             return NAME_OR_INT;
1822           }
1823       }
1824
1825     /* Any other kind of symbol.  */
1826     yylval.ssym.sym = sym;
1827     yylval.ssym.is_a_field_of_this = is_a_field_of_this;
1828     return NAME;
1829   }
1830 }
1831
1832 void
1833 yyerror (msg)
1834      char *msg;
1835 {
1836   if (*lexptr == '\0')
1837     error("A %s near end of expression.",  (msg ? msg : "error"));
1838   else
1839     error ("A %s in expression, near `%s'.", (msg ? msg : "error"),
1840            lexptr);
1841 }