perly.y

   1 /*    perly.y
   2  *
   3  *    Copyright (c) 1991-1997, Larry Wall
   4  *
   5  *    You may distribute under the terms of either the GNU General Public
   6  *    License or the Artistic License, as specified in the README file.
   7  *
   8  */
   9
  10 /*
  11  * 'I see,' laughed Strider.  'I look foul and feel fair.  Is that it?
  12  * All that is gold does not glitter, not all those who wander are lost.'
  13  */
  14
  15 %{
  16 #include "EXTERN.h"
  17 #include "perl.h"
  18
  19 static void
  20 dep()
  21 {
  22     deprecate("\"do\" to call subroutines");
  23 }
  24
  25 %}
  26
  27 %start prog
  28
  29 %union {
  30     I32 ival;
  31     char *pval;
  32     OP *opval;
  33     GV *gvval;
  34 }
  35
  36 %token <ival> '{' ')'
  37
  38 %token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF
  39 %token <opval> FUNC0SUB UNIOPSUB LSTOPSUB
  40 %token <pval> LABEL
  41 %token <ival> FORMAT SUB ANONSUB PACKAGE USE
  42 %token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
  43 %token <ival> LOOPEX DOTDOT
  44 %token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
  45 %token <ival> RELOP EQOP MULOP ADDOP
  46 %token <ival> DOLSHARP DO HASHBRACK NOAMP
  47 %token LOCAL MY
  48
  49 %type <ival> prog decl local format startsub startanonsub startformsub
  50 %type <ival> remember mremember '&'
  51 %type <opval> block mblock lineseq line loop cond else
  52 %type <opval> expr term scalar ary hsh arylen star amper sideff
  53 %type <opval> argexpr nexpr texpr iexpr mexpr mnexpr mtexpr miexpr
  54 %type <opval> listexpr listexprcom indirob listop method
  55 %type <opval> formname subname proto subbody cont my_scalar
  56 %type <pval> label
  57
  58 %left <ival> OROP
  59 %left ANDOP
  60 %right NOTOP
  61 %nonassoc LSTOP LSTOPSUB
  62 %left ','
  63 %right <ival> ASSIGNOP
  64 %right '?' ':'
  65 %nonassoc DOTDOT
  66 %left OROR
  67 %left ANDAND
  68 %left <ival> BITOROP
  69 %left <ival> BITANDOP
  70 %nonassoc EQOP
  71 %nonassoc RELOP
  72 %nonassoc UNIOP UNIOPSUB
  73 %left <ival> SHIFTOP
  74 %left ADDOP
  75 %left MULOP
  76 %left <ival> MATCHOP
  77 %right '!' '~' UMINUS REFGEN
  78 %right <ival> POWOP
  79 %nonassoc PREINC PREDEC POSTINC POSTDEC
  80 %left ARROW
  81 %left '('
  82
  83 %% /* RULES */
  84
  85 prog    :       /* NULL */
  86                 {
  87 #if defined(YYDEBUG) && defined(DEBUGGING)
  88                     yydebug = (debug & 1);
  89 #endif
  90                     expect = XSTATE;
  91                 }
  92         /*CONTINUED*/   lineseq
  93                         { newPROG($2); }
  94         ;
  95
  96 block   :       '{' remember lineseq '}'
  97                         { if (copline > (line_t)$1)
  98                               copline = $1;
  99                           $$ = block_end($2, $3); }
 100         ;
 101
 102 remember:       /* NULL */      /* start a full lexical scope */
 103                         { $$ = block_start(TRUE); }
 104         ;
 105
 106 mblock  :       '{' mremember lineseq '}'
 107                         { if (copline > (line_t)$1)
 108                               copline = $1;
 109                           $$ = block_end($2, $3); }
 110         ;
 111
 112 mremember:      /* NULL */      /* start a partial lexical scope */
 113                         { $$ = block_start(FALSE); }
 114         ;
 115
 116 lineseq :       /* NULL */
 117                         { $$ = Nullop; }
 118         |       lineseq decl
 119                         { $$ = $1; }
 120         |       lineseq line
 121                         {   $$ = append_list(OP_LINESEQ,
 122                                 (LISTOP*)$1, (LISTOP*)$2);
 123                             pad_reset_pending = TRUE;
 124                             if ($1 && $2) hints |= HINT_BLOCK_SCOPE; }
 125         ;
 126
 127 line    :       label cond
 128                         { $$ = newSTATEOP(0, $1, $2); }
 129         |       loop    /* loops add their own labels */
 130         |       label ';'
 131                         { if ($1 != Nullch) {
 132                               $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0));
 133                             }
 134                             else {
 135                               $$ = Nullop;
 136                               copline = NOLINE;
 137                             }
 138                             expect = XSTATE; }
 139         |       label sideff ';'
 140                         { $$ = newSTATEOP(0, $1, $2);
 141                           expect = XSTATE; }
 142         ;
 143
 144 sideff  :       error
 145                         { $$ = Nullop; }
 146         |       expr
 147                         { $$ = $1; }
 148         |       expr IF expr
 149                         { $$ = newLOGOP(OP_AND, 0, $3, $1); }
 150         |       expr UNLESS expr
 151                         { $$ = newLOGOP(OP_OR, 0, $3, $1); }
 152         |       expr WHILE expr
 153                         { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
 154         |       expr UNTIL iexpr
 155                         { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);}
 156         ;
 157
 158 else    :       /* NULL */
 159                         { $$ = Nullop; }
 160         |       ELSE mblock
 161                         { $$ = scope($2); }
 162         |       ELSIF '(' mexpr ')' mblock else
 163                         { copline = $1;
 164                             $$ = newSTATEOP(0, Nullch,
 165                                    newCONDOP(0, $3, scope($5), $6));
 166                             hints |= HINT_BLOCK_SCOPE; }
 167         ;
 168
 169 cond    :       IF '(' remember mexpr ')' mblock else
 170                         { copline = $1;
 171                             $$ = block_end($3,
 172                                    newCONDOP(0, $4, scope($6), $7)); }
 173         |       UNLESS '(' remember miexpr ')' mblock else
 174                         { copline = $1;
 175                             $$ = block_end($3,
 176                                    newCONDOP(0, $4, scope($6), $7)); }
 177         ;
 178
 179 cont    :       /* NULL */
 180                         { $$ = Nullop; }
 181         |       CONTINUE block
 182                         { $$ = scope($2); }
 183         ;
 184
 185 loop    :       label WHILE '(' remember mtexpr ')' mblock cont
 186                         { copline = $2;
 187                             $$ = block_end($4,
 188                                    newSTATEOP(0, $1,
 189                                      newWHILEOP(0, 1, (LOOP*)Nullop,
 190                                                 $5, $7, $8))); }
 191         |       label UNTIL '(' remember miexpr ')' mblock cont
 192                         { copline = $2;
 193                             $$ = block_end($4,
 194                                    newSTATEOP(0, $1,
 195                                      newWHILEOP(0, 1, (LOOP*)Nullop,
 196                                                 $5, $7, $8))); }
 197         |       label FOR MY remember my_scalar '(' mexpr ')' mblock cont
 198                         { $$ = block_end($4,
 199                                  newFOROP(0, $1, $2, $5, $7, $9, $10)); }
 200         |       label FOR scalar '(' remember mexpr ')' mblock cont
 201                         { $$ = block_end($5,
 202                                  newFOROP(0, $1, $2, mod($3, OP_ENTERLOOP),
 203                                           $6, $8, $9)); }
 204         |       label FOR '(' remember mexpr ')' mblock cont
 205                         { $$ = block_end($4,
 206                                  newFOROP(0, $1, $2, Nullop, $5, $7, $8)); }
 207         |       label FOR '(' remember mnexpr ';' mtexpr ';' mnexpr ')' mblock
 208                         /* basically fake up an initialize-while lineseq */
 209                         { copline = $2;
 210                             $$ = block_end($4,
 211                                    newSTATEOP(0, $1,
 212                                      append_elem(OP_LINESEQ, scalar($5),
 213                                        newWHILEOP(0, 1, (LOOP*)Nullop,
 214                                                   scalar($7),
 215                                                   $11, scalar($9))))); }
 216         |       label block cont  /* a block is a loop that happens once */
 217                         { $$ = newSTATEOP(0,
 218                                 $1, newWHILEOP(0, 1, (LOOP*)Nullop,
 219                                         Nullop, $2, $3)); }
 220         ;
 221
 222 nexpr   :       /* NULL */
 223                         { $$ = Nullop; }
 224         |       sideff
 225         ;
 226
 227 texpr   :       /* NULL means true */
 228                         { (void)scan_num("1"); $$ = yylval.opval; }
 229         |       expr
 230         ;
 231
 232 iexpr   :       expr
 233                         { $$ = invert(scalar($1)); }
 234         ;
 235
 236 mexpr   :       expr
 237                         { $$ = $1; intro_my(); }
 238         ;
 239
 240 mnexpr  :       nexpr
 241                         { $$ = $1; intro_my(); }
 242         ;
 243
 244 mtexpr  :       texpr
 245                         { $$ = $1; intro_my(); }
 246         ;
 247
 248 miexpr  :       iexpr
 249                         { $$ = $1; intro_my(); }
 250         ;
 251
 252 label   :       /* empty */
 253                         { $$ = Nullch; }
 254         |       LABEL
 255         ;
 256
 257 decl    :       format
 258                         { $$ = 0; }
 259         |       subrout
 260                         { $$ = 0; }
 261         |       package
 262                         { $$ = 0; }
 263         |       use
 264                         { $$ = 0; }
 265         ;
 266
 267 format  :       FORMAT startformsub formname block
 268                         { newFORM($2, $3, $4); }
 269         ;
 270
 271 formname:       WORD            { $$ = $1; }
 272         |       /* NULL */      { $$ = Nullop; }
 273         ;
 274
 275 subrout :       SUB startsub subname proto subbody
 276                         { newSUB($2, $3, $4, $5); }
 277         ;
 278
 279 startsub:       /* NULL */      /* start a regular subroutine scope */
 280                         { $$ = start_subparse(FALSE, 0); }
 281         ;
 282
 283 startanonsub:   /* NULL */      /* start an anonymous subroutine scope */
 284                         { $$ = start_subparse(FALSE, CVf_ANON); }
 285         ;
 286
 287 startformsub:   /* NULL */      /* start a format subroutine scope */
 288                         { $$ = start_subparse(TRUE, 0); }
 289         ;
 290
 291 subname :       WORD    { char *name = SvPVx(((SVOP*)$1)->op_sv, na);
 292                           if (strEQ(name, "BEGIN") || strEQ(name, "END"))
 293                               CvUNIQUE_on(compcv);
 294                           $$ = $1; }
 295         ;
 296
 297 proto   :       /* NULL */
 298                         { $$ = Nullop; }
 299         |       THING
 300         ;
 301
 302 subbody :       block   { $$ = $1; }
 303         |       ';'     { $$ = Nullop; expect = XSTATE; }
 304         ;
 305
 306 package :       PACKAGE WORD ';'
 307                         { package($2); }
 308         |       PACKAGE ';'
 309                         { package(Nullop); }
 310         ;
 311
 312 use     :       USE startsub
 313                         { CvUNIQUE_on(compcv); /* It's a BEGIN {} */ }
 314                     WORD WORD listexpr ';'
 315                         { utilize($1, $2, $4, $5, $6); }
 316         ;
 317
 318 expr    :       expr ANDOP expr
 319                         { $$ = newLOGOP(OP_AND, 0, $1, $3); }
 320         |       expr OROP expr
 321                         { $$ = newLOGOP($2, 0, $1, $3); }
 322         |       argexpr
 323         ;
 324
 325 argexpr :       argexpr ','
 326                         { $$ = $1; }
 327         |       argexpr ',' term
 328                         { $$ = append_elem(OP_LIST, $1, $3); }
 329         |       term
 330         ;
 331
 332 listop  :       LSTOP indirob argexpr
 333                         { $$ = convert($1, OPf_STACKED,
 334                                 prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); }
 335         |       FUNC '(' indirob expr ')'
 336                         { $$ = convert($1, OPf_STACKED,
 337                                 prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); }
 338         |       term ARROW method '(' listexprcom ')'
 339                         { $$ = convert(OP_ENTERSUB, OPf_STACKED,
 340                                 append_elem(OP_LIST,
 341                                     prepend_elem(OP_LIST, scalar($1), $5),
 342                                     newUNOP(OP_METHOD, 0, $3))); }
 343         |       METHOD indirob listexpr
 344                         { $$ = convert(OP_ENTERSUB, OPf_STACKED,
 345                                 append_elem(OP_LIST,
 346                                     prepend_elem(OP_LIST, $2, $3),
 347                                     newUNOP(OP_METHOD, 0, $1))); }
 348         |       FUNCMETH indirob '(' listexprcom ')'
 349                         { $$ = convert(OP_ENTERSUB, OPf_STACKED,
 350                                 append_elem(OP_LIST,
 351                                     prepend_elem(OP_LIST, $2, $4),
 352                                     newUNOP(OP_METHOD, 0, $1))); }
 353         |       LSTOP listexpr
 354                         { $$ = convert($1, 0, $2); }
 355         |       FUNC '(' listexprcom ')'
 356                         { $$ = convert($1, 0, $3); }
 357         |       LSTOPSUB startanonsub block
 358                         { $3 = newANONSUB($2, 0, $3); }
 359                     listexpr            %prec LSTOP
 360                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 361                                  append_elem(OP_LIST,
 362                                    prepend_elem(OP_LIST, $3, $5), $1)); }
 363         ;
 364
 365 method  :       METHOD
 366         |       scalar
 367         ;
 368
 369 term    :       term ASSIGNOP term
 370                         { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
 371         |       term POWOP term
 372                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 373         |       term MULOP term
 374                         {   if ($2 != OP_REPEAT)
 375                                 scalar($1);
 376                             $$ = newBINOP($2, 0, $1, scalar($3)); }
 377         |       term ADDOP term
 378                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 379         |       term SHIFTOP term
 380                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 381         |       term RELOP term
 382                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 383         |       term EQOP term
 384                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 385         |       term BITANDOP term
 386                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 387         |       term BITOROP term
 388                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 389         |       term DOTDOT term
 390                         { $$ = newRANGE($2, scalar($1), scalar($3));}
 391         |       term ANDAND term
 392                         { $$ = newLOGOP(OP_AND, 0, $1, $3); }
 393         |       term OROR term
 394                         { $$ = newLOGOP(OP_OR, 0, $1, $3); }
 395         |       term '?' term ':' term
 396                         { $$ = newCONDOP(0, $1, $3, $5); }
 397         |       term MATCHOP term
 398                         { $$ = bind_match($2, $1, $3); }
 399
 400         |       '-' term %prec UMINUS
 401                         { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
 402         |       '+' term %prec UMINUS
 403                         { $$ = $2; }
 404         |       '!' term
 405                         { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
 406         |       '~' term
 407                         { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
 408         |       REFGEN term
 409                         { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); }
 410         |       term POSTINC
 411                         { $$ = newUNOP(OP_POSTINC, 0,
 412                                         mod(scalar($1), OP_POSTINC)); }
 413         |       term POSTDEC
 414                         { $$ = newUNOP(OP_POSTDEC, 0,
 415                                         mod(scalar($1), OP_POSTDEC)); }
 416         |       PREINC term
 417                         { $$ = newUNOP(OP_PREINC, 0,
 418                                         mod(scalar($2), OP_PREINC)); }
 419         |       PREDEC term
 420                         { $$ = newUNOP(OP_PREDEC, 0,
 421                                         mod(scalar($2), OP_PREDEC)); }
 422         |       local term      %prec UNIOP
 423                         { $$ = localize($2,$1); }
 424         |       '(' expr ')'
 425                         { $$ = sawparens($2); }
 426         |       '(' ')'
 427                         { $$ = sawparens(newNULLLIST()); }
 428         |       '[' expr ']'                            %prec '('
 429                         { $$ = newANONLIST($2); }
 430         |       '[' ']'                                 %prec '('
 431                         { $$ = newANONLIST(Nullop); }
 432         |       HASHBRACK expr ';' '}'                  %prec '('
 433                         { $$ = newANONHASH($2); }
 434         |       HASHBRACK ';' '}'                               %prec '('
 435                         { $$ = newANONHASH(Nullop); }
 436         |       ANONSUB startanonsub proto block                %prec '('
 437                         { $$ = newANONSUB($2, $3, $4); }
 438         |       scalar  %prec '('
 439                         { $$ = $1; }
 440         |       star '{' expr ';' '}'
 441                         { $$ = newBINOP(OP_GELEM, 0, newGVREF(0,$1), $3); }
 442         |       star    %prec '('
 443                         { $$ = $1; }
 444         |       scalar '[' expr ']'     %prec '('
 445                         { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
 446         |       term ARROW '[' expr ']' %prec '('
 447                         { $$ = newBINOP(OP_AELEM, 0,
 448                                         ref(newAVREF($1),OP_RV2AV),
 449                                         scalar($4));}
 450         |       term '[' expr ']'       %prec '('
 451                         { assertref($1); $$ = newBINOP(OP_AELEM, 0,
 452                                         ref(newAVREF($1),OP_RV2AV),
 453                                         scalar($3));}
 454         |       hsh     %prec '('
 455                         { $$ = $1; }
 456         |       ary     %prec '('
 457                         { $$ = $1; }
 458         |       arylen  %prec '('
 459                         { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
 460         |       scalar '{' expr ';' '}' %prec '('
 461                         { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
 462                             expect = XOPERATOR; }
 463         |       term ARROW '{' expr ';' '}'     %prec '('
 464                         { $$ = newBINOP(OP_HELEM, 0,
 465                                         ref(newHVREF($1),OP_RV2HV),
 466                                         jmaybe($4));
 467                             expect = XOPERATOR; }
 468         |       term '{' expr ';' '}'   %prec '('
 469                         { assertref($1); $$ = newBINOP(OP_HELEM, 0,
 470                                         ref(newHVREF($1),OP_RV2HV),
 471                                         jmaybe($3));
 472                             expect = XOPERATOR; }
 473         |       '(' expr ')' '[' expr ']'       %prec '('
 474                         { $$ = newSLICEOP(0, $5, $2); }
 475         |       '(' ')' '[' expr ']'    %prec '('
 476                         { $$ = newSLICEOP(0, $4, Nullop); }
 477         |       ary '[' expr ']'        %prec '('
 478                         { $$ = prepend_elem(OP_ASLICE,
 479                                 newOP(OP_PUSHMARK, 0),
 480                                     newLISTOP(OP_ASLICE, 0,
 481                                         list($3),
 482                                         ref($1, OP_ASLICE))); }
 483         |       ary '{' expr ';' '}'    %prec '('
 484                         { $$ = prepend_elem(OP_HSLICE,
 485                                 newOP(OP_PUSHMARK, 0),
 486                                     newLISTOP(OP_HSLICE, 0,
 487                                         list($3),
 488                                         ref(oopsHV($1), OP_HSLICE)));
 489                             expect = XOPERATOR; }
 490         |       THING   %prec '('
 491                         { $$ = $1; }
 492         |       amper
 493                         { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); }
 494         |       amper '(' ')'
 495                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
 496         |       amper '(' expr ')'
 497                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 498                             append_elem(OP_LIST, $3, scalar($1))); }
 499         |       NOAMP WORD listexpr
 500                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 501                             append_elem(OP_LIST, $3, scalar($2))); }
 502         |       DO term %prec UNIOP
 503                         { $$ = newUNOP(OP_DOFILE, 0, scalar($2)); }
 504         |       DO block        %prec '('
 505                         { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
 506         |       DO WORD '(' ')'
 507                         { $$ = newUNOP(OP_ENTERSUB,
 508                             OPf_SPECIAL|OPf_STACKED,
 509                             prepend_elem(OP_LIST,
 510                                 scalar(newCVREF(
 511                                     (OPpENTERSUB_AMPER<<8),
 512                                     scalar($2)
 513                                 )),Nullop)); dep();}
 514         |       DO WORD '(' expr ')'
 515                         { $$ = newUNOP(OP_ENTERSUB,
 516                             OPf_SPECIAL|OPf_STACKED,
 517                             append_elem(OP_LIST,
 518                                 $4,
 519                                 scalar(newCVREF(
 520                                     (OPpENTERSUB_AMPER<<8),
 521                                     scalar($2)
 522                                 )))); dep();}
 523         |       DO scalar '(' ')'
 524                         { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
 525                             prepend_elem(OP_LIST,
 526                                 scalar(newCVREF(0,scalar($2))), Nullop)); dep();}
 527         |       DO scalar '(' expr ')'
 528                         { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
 529                             prepend_elem(OP_LIST,
 530                                 $4,
 531                                 scalar(newCVREF(0,scalar($2))))); dep();}
 532         |       LOOPEX
 533                         { $$ = newOP($1, OPf_SPECIAL);
 534                             hints |= HINT_BLOCK_SCOPE; }
 535         |       LOOPEX term
 536                         { $$ = newLOOPEX($1,$2); }
 537         |       NOTOP argexpr
 538                         { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
 539         |       UNIOP
 540                         { $$ = newOP($1, 0); }
 541         |       UNIOP block
 542                         { $$ = newUNOP($1, 0, $2); }
 543         |       UNIOP term
 544                         { $$ = newUNOP($1, 0, $2); }
 545         |       UNIOPSUB term
 546                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 547                             append_elem(OP_LIST, $2, scalar($1))); }
 548         |       FUNC0
 549                         { $$ = newOP($1, 0); }
 550         |       FUNC0 '(' ')'
 551                         { $$ = newOP($1, 0); }
 552         |       FUNC0SUB
 553                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 554                                 scalar($1)); }
 555         |       FUNC1 '(' ')'
 556                         { $$ = newOP($1, OPf_SPECIAL); }
 557         |       FUNC1 '(' expr ')'
 558                         { $$ = newUNOP($1, 0, $3); }
 559         |       PMFUNC '(' term ')'
 560                         { $$ = pmruntime($1, $3, Nullop); }
 561         |       PMFUNC '(' term ',' term ')'
 562                         { $$ = pmruntime($1, $3, $5); }
 563         |       WORD
 564         |       listop
 565         ;
 566
 567 listexpr:       /* NULL */
 568                         { $$ = Nullop; }
 569         |       argexpr
 570                         { $$ = $1; }
 571         ;
 572
 573 listexprcom:    /* NULL */
 574                         { $$ = Nullop; }
 575         |       expr
 576                         { $$ = $1; }
 577         |       expr ','
 578                         { $$ = $1; }
 579         ;
 580
 581 local   :       LOCAL   { $$ = 0; }
 582         |       MY      { $$ = 1; }
 583         ;
 584
 585 my_scalar:      scalar
 586                         { in_my = 0; $$ = my($1); }
 587         ;
 588
 589 amper   :       '&' indirob
 590                         { $$ = newCVREF($1,$2); }
 591         ;
 592
 593 scalar  :       '$' indirob
 594                         { $$ = newSVREF($2); }
 595         ;
 596
 597 ary     :       '@' indirob
 598                         { $$ = newAVREF($2); }
 599         ;
 600
 601 hsh     :       '%' indirob
 602                         { $$ = newHVREF($2); }
 603         ;
 604
 605 arylen  :       DOLSHARP indirob
 606                         { $$ = newAVREF($2); }
 607         ;
 608
 609 star    :       '*' indirob
 610                         { $$ = newGVREF(0,$2); }
 611         ;
 612
 613 indirob :       WORD
 614                         { $$ = scalar($1); }
 615         |       scalar
 616                         { $$ = scalar($1);  }
 617         |       block
 618                         { $$ = scope($1); }
 619
 620         |       PRIVATEREF
 621                         { $$ = $1; }
 622         ;
 623
 624 %% /* PROGRAM */