perly.y

   1 /*    perly.y
   2  *
   3  *    Copyright (c) 1991-2001, 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 #define PERL_IN_PERLY_C
  18 #include "perl.h"
  19
  20 #define dep() deprecate("\"do\" to call subroutines")
  21
  22 /* stuff included here to make perly_c.diff apply better */
  23
  24 #define yydebug     PL_yydebug
  25 #define yynerrs     PL_yynerrs
  26 #define yyerrflag   PL_yyerrflag
  27 #define yychar      PL_yychar
  28 #define yyval       PL_yyval
  29 #define yylval      PL_yylval
  30
  31 struct ysv {
  32     short* yyss;
  33     YYSTYPE* yyvs;
  34     int oldyydebug;
  35     int oldyynerrs;
  36     int oldyyerrflag;
  37     int oldyychar;
  38     YYSTYPE oldyyval;
  39     YYSTYPE oldyylval;
  40 };
  41
  42 static void yydestruct(pTHXo_ void *ptr);
  43
  44 %}
  45
  46 %start prog
  47
  48 %{
  49 #if 0 /* get this from perly.h instead */
  50 %}
  51
  52 %union {
  53     I32 ival;
  54     char *pval;
  55     OP *opval;
  56     GV *gvval;
  57 }
  58
  59 %{
  60 #endif /* 0 */
  61
  62 #ifdef USE_PURE_BISON
  63 #define YYLEX_PARAM (&yychar)
  64 #define yylex yylex_r
  65 #endif
  66
  67 %}
  68
  69 %token <ival> '{'
  70
  71 %token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF
  72 %token <opval> FUNC0SUB UNIOPSUB LSTOPSUB
  73 %token <pval> LABEL
  74 %token <ival> FORMAT SUB ANONSUB PACKAGE USE
  75 %token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
  76 %token <ival> LOOPEX DOTDOT
  77 %token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
  78 %token <ival> RELOP EQOP MULOP ADDOP
  79 %token <ival> DOLSHARP DO HASHBRACK NOAMP
  80 %token <ival> LOCAL MY MYSUB
  81 %token COLONATTR
  82
  83 %type <ival> prog decl format startsub startanonsub startformsub
  84 %type <ival> remember mremember '&'
  85 %type <opval> block mblock lineseq line loop cond else
  86 %type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
  87 %type <opval> argexpr nexpr texpr iexpr mexpr mnexpr mtexpr miexpr
  88 %type <opval> listexpr listexprcom indirob listop method
  89 %type <opval> formname subname proto subbody cont my_scalar
  90 %type <opval> subattrlist myattrlist mysubrout myattrterm myterm
  91 %type <pval> label
  92
  93 %nonassoc PREC_LOW
  94 %nonassoc LOOPEX
  95
  96 %left <ival> OROP
  97 %left ANDOP
  98 %right NOTOP
  99 %nonassoc LSTOP LSTOPSUB
 100 %left ','
 101 %right <ival> ASSIGNOP
 102 %right '?' ':'
 103 %nonassoc DOTDOT
 104 %left OROR
 105 %left ANDAND
 106 %left <ival> BITOROP
 107 %left <ival> BITANDOP
 108 %nonassoc EQOP
 109 %nonassoc RELOP
 110 %nonassoc UNIOP UNIOPSUB
 111 %left <ival> SHIFTOP
 112 %left ADDOP
 113 %left MULOP
 114 %left <ival> MATCHOP
 115 %right '!' '~' UMINUS REFGEN
 116 %right <ival> POWOP
 117 %nonassoc PREINC PREDEC POSTINC POSTDEC
 118 %left ARROW
 119 %nonassoc <ival> ')'
 120 %left '('
 121 %left '[' '{'
 122
 123 %% /* RULES */
 124
 125 prog    :       /* NULL */
 126                 {
 127 #if defined(YYDEBUG) && defined(DEBUGGING)
 128                     yydebug = (PL_debug & 1);
 129 #endif
 130                     PL_expect = XSTATE;
 131                 }
 132         /*CONTINUED*/   lineseq
 133                         { newPROG($2); }
 134         ;
 135
 136 block   :       '{' remember lineseq '}'
 137                         { if (PL_copline > (line_t)$1)
 138                               PL_copline = $1;
 139                           $$ = block_end($2, $3); }
 140         ;
 141
 142 remember:       /* NULL */      /* start a full lexical scope */
 143                         { $$ = block_start(TRUE); }
 144         ;
 145
 146 mblock  :       '{' mremember lineseq '}'
 147                         { if (PL_copline > (line_t)$1)
 148                               PL_copline = $1;
 149                           $$ = block_end($2, $3); }
 150         ;
 151
 152 mremember:      /* NULL */      /* start a partial lexical scope */
 153                         { $$ = block_start(FALSE); }
 154         ;
 155
 156 lineseq :       /* NULL */
 157                         { $$ = Nullop; }
 158         |       lineseq decl
 159                         { $$ = $1; }
 160         |       lineseq line
 161                         {   $$ = append_list(OP_LINESEQ,
 162                                 (LISTOP*)$1, (LISTOP*)$2);
 163                             PL_pad_reset_pending = TRUE;
 164                             if ($1 && $2) PL_hints |= HINT_BLOCK_SCOPE; }
 165         ;
 166
 167 line    :       label cond
 168                         { $$ = newSTATEOP(0, $1, $2); }
 169         |       loop    /* loops add their own labels */
 170         |       label ';'
 171                         { if ($1 != Nullch) {
 172                               $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0));
 173                             }
 174                             else {
 175                               $$ = Nullop;
 176                               PL_copline = NOLINE;
 177                             }
 178                             PL_expect = XSTATE; }
 179         |       label sideff ';'
 180                         { $$ = newSTATEOP(0, $1, $2);
 181                           PL_expect = XSTATE; }
 182         ;
 183
 184 sideff  :       error
 185                         { $$ = Nullop; }
 186         |       expr
 187                         { $$ = $1; }
 188         |       expr IF expr
 189                         { $$ = newLOGOP(OP_AND, 0, $3, $1); }
 190         |       expr UNLESS expr
 191                         { $$ = newLOGOP(OP_OR, 0, $3, $1); }
 192         |       expr WHILE expr
 193                         { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
 194         |       expr UNTIL iexpr
 195                         { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);}
 196         |       expr FOR expr
 197                         { $$ = newFOROP(0, Nullch, $2,
 198                                         Nullop, $3, $1, Nullop); }
 199         ;
 200
 201 else    :       /* NULL */
 202                         { $$ = Nullop; }
 203         |       ELSE mblock
 204                         { ($2)->op_flags |= OPf_PARENS; $$ = scope($2); }
 205         |       ELSIF '(' mexpr ')' mblock else
 206                         { PL_copline = $1;
 207                             $$ = newCONDOP(0, $3, scope($5), $6);
 208                             PL_hints |= HINT_BLOCK_SCOPE; }
 209         ;
 210
 211 cond    :       IF '(' remember mexpr ')' mblock else
 212                         { PL_copline = $1;
 213                             $$ = block_end($3,
 214                                    newCONDOP(0, $4, scope($6), $7)); }
 215         |       UNLESS '(' remember miexpr ')' mblock else
 216                         { PL_copline = $1;
 217                             $$ = block_end($3,
 218                                    newCONDOP(0, $4, scope($6), $7)); }
 219         ;
 220
 221 cont    :       /* NULL */
 222                         { $$ = Nullop; }
 223         |       CONTINUE block
 224                         { $$ = scope($2); }
 225         ;
 226
 227 loop    :       label WHILE '(' remember mtexpr ')' mblock cont
 228                         { PL_copline = $2;
 229                             $$ = block_end($4,
 230                                    newSTATEOP(0, $1,
 231                                      newWHILEOP(0, 1, (LOOP*)Nullop,
 232                                                 $2, $5, $7, $8))); }
 233         |       label UNTIL '(' remember miexpr ')' mblock cont
 234                         { PL_copline = $2;
 235                             $$ = block_end($4,
 236                                    newSTATEOP(0, $1,
 237                                      newWHILEOP(0, 1, (LOOP*)Nullop,
 238                                                 $2, $5, $7, $8))); }
 239         |       label FOR MY remember my_scalar '(' mexpr ')' mblock cont
 240                         { $$ = block_end($4,
 241                                  newFOROP(0, $1, $2, $5, $7, $9, $10)); }
 242         |       label FOR scalar '(' remember mexpr ')' mblock cont
 243                         { $$ = block_end($5,
 244                                  newFOROP(0, $1, $2, mod($3, OP_ENTERLOOP),
 245                                           $6, $8, $9)); }
 246         |       label FOR '(' remember mexpr ')' mblock cont
 247                         { $$ = block_end($4,
 248                                  newFOROP(0, $1, $2, Nullop, $5, $7, $8)); }
 249         |       label FOR '(' remember mnexpr ';' mtexpr ';' mnexpr ')' mblock
 250                         /* basically fake up an initialize-while lineseq */
 251                         { OP *forop = append_elem(OP_LINESEQ,
 252                                         scalar($5),
 253                                         newWHILEOP(0, 1, (LOOP*)Nullop,
 254                                                    $2, scalar($7),
 255                                                    $11, scalar($9)));
 256                           PL_copline = $2;
 257                           $$ = block_end($4, newSTATEOP(0, $1, forop)); }
 258         |       label block cont  /* a block is a loop that happens once */
 259                         { $$ = newSTATEOP(0, $1,
 260                                  newWHILEOP(0, 1, (LOOP*)Nullop,
 261                                             NOLINE, Nullop, $2, $3)); }
 262         ;
 263
 264 nexpr   :       /* NULL */
 265                         { $$ = Nullop; }
 266         |       sideff
 267         ;
 268
 269 texpr   :       /* NULL means true */
 270                         { (void)scan_num("1", &yylval); $$ = yylval.opval; }
 271         |       expr
 272         ;
 273
 274 iexpr   :       expr
 275                         { $$ = invert(scalar($1)); }
 276         ;
 277
 278 mexpr   :       expr
 279                         { $$ = $1; intro_my(); }
 280         ;
 281
 282 mnexpr  :       nexpr
 283                         { $$ = $1; intro_my(); }
 284         ;
 285
 286 mtexpr  :       texpr
 287                         { $$ = $1; intro_my(); }
 288         ;
 289
 290 miexpr  :       iexpr
 291                         { $$ = $1; intro_my(); }
 292         ;
 293
 294 label   :       /* empty */
 295                         { $$ = Nullch; }
 296         |       LABEL
 297         ;
 298
 299 decl    :       format
 300                         { $$ = 0; }
 301         |       subrout
 302                         { $$ = 0; }
 303         |       mysubrout
 304                         { $$ = 0; }
 305         |       package
 306                         { $$ = 0; }
 307         |       use
 308                         { $$ = 0; }
 309         ;
 310
 311 format  :       FORMAT startformsub formname block
 312                         { newFORM($2, $3, $4); }
 313         ;
 314
 315 formname:       WORD            { $$ = $1; }
 316         |       /* NULL */      { $$ = Nullop; }
 317         ;
 318
 319 mysubrout:      MYSUB startsub subname proto subattrlist subbody
 320                         { newMYSUB($2, $3, $4, $5, $6); }
 321         ;
 322
 323 subrout :       SUB startsub subname proto subattrlist subbody
 324                         { newATTRSUB($2, $3, $4, $5, $6); }
 325         ;
 326
 327 startsub:       /* NULL */      /* start a regular subroutine scope */
 328                         { $$ = start_subparse(FALSE, 0); }
 329         ;
 330
 331 startanonsub:   /* NULL */      /* start an anonymous subroutine scope */
 332                         { $$ = start_subparse(FALSE, CVf_ANON); }
 333         ;
 334
 335 startformsub:   /* NULL */      /* start a format subroutine scope */
 336                         { $$ = start_subparse(TRUE, 0); }
 337         ;
 338
 339 subname :       WORD    { STRLEN n_a; char *name = SvPV(((SVOP*)$1)->op_sv,n_a);
 340                           if (strEQ(name, "BEGIN") || strEQ(name, "END")
 341                               || strEQ(name, "INIT") || strEQ(name, "CHECK"))
 342                               CvSPECIAL_on(PL_compcv);
 343                           $$ = $1; }
 344         ;
 345
 346 proto   :       /* NULL */
 347                         { $$ = Nullop; }
 348         |       THING
 349         ;
 350
 351 subattrlist:    /* NULL */
 352                         { $$ = Nullop; }
 353         |       COLONATTR THING
 354                         { $$ = $2; }
 355         |       COLONATTR
 356                         { $$ = Nullop; }
 357         ;
 358
 359 myattrlist:     COLONATTR THING
 360                         { $$ = $2; }
 361         |       COLONATTR
 362                         { $$ = Nullop; }
 363         ;
 364
 365 subbody :       block   { $$ = $1; }
 366         |       ';'     { $$ = Nullop; PL_expect = XSTATE; }
 367         ;
 368
 369 package :       PACKAGE WORD ';'
 370                         { package($2); }
 371         |       PACKAGE ';'
 372                         { package(Nullop); }
 373         ;
 374
 375 use     :       USE startsub
 376                         { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
 377                     WORD WORD listexpr ';'
 378                         { utilize($1, $2, $4, $5, $6); }
 379         ;
 380
 381 expr    :       expr ANDOP expr
 382                         { $$ = newLOGOP(OP_AND, 0, $1, $3); }
 383         |       expr OROP expr
 384                         { $$ = newLOGOP($2, 0, $1, $3); }
 385         |       argexpr %prec PREC_LOW
 386         ;
 387
 388 argexpr :       argexpr ','
 389                         { $$ = $1; }
 390         |       argexpr ',' term
 391                         { $$ = append_elem(OP_LIST, $1, $3); }
 392         |       term %prec PREC_LOW
 393         ;
 394
 395 listop  :       LSTOP indirob argexpr
 396                         { $$ = convert($1, OPf_STACKED,
 397                                 prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); }
 398         |       FUNC '(' indirob expr ')'
 399                         { $$ = convert($1, OPf_STACKED,
 400                                 prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); }
 401         |       term ARROW method '(' listexprcom ')'
 402                         { $$ = convert(OP_ENTERSUB, OPf_STACKED,
 403                                 append_elem(OP_LIST,
 404                                     prepend_elem(OP_LIST, scalar($1), $5),
 405                                     newUNOP(OP_METHOD, 0, $3))); }
 406         |       term ARROW method
 407                         { $$ = convert(OP_ENTERSUB, OPf_STACKED,
 408                                 append_elem(OP_LIST, scalar($1),
 409                                     newUNOP(OP_METHOD, 0, $3))); }
 410         |       METHOD indirob listexpr
 411                         { $$ = convert(OP_ENTERSUB, OPf_STACKED,
 412                                 append_elem(OP_LIST,
 413                                     prepend_elem(OP_LIST, $2, $3),
 414                                     newUNOP(OP_METHOD, 0, $1))); }
 415         |       FUNCMETH indirob '(' listexprcom ')'
 416                         { $$ = convert(OP_ENTERSUB, OPf_STACKED,
 417                                 append_elem(OP_LIST,
 418                                     prepend_elem(OP_LIST, $2, $4),
 419                                     newUNOP(OP_METHOD, 0, $1))); }
 420         |       LSTOP listexpr
 421                         { $$ = convert($1, 0, $2); }
 422         |       FUNC '(' listexprcom ')'
 423                         { $$ = convert($1, 0, $3); }
 424         |       LSTOPSUB startanonsub block
 425                         { $3 = newANONATTRSUB($2, 0, Nullop, $3); }
 426                     listexpr            %prec LSTOP
 427                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 428                                  append_elem(OP_LIST,
 429                                    prepend_elem(OP_LIST, $3, $5), $1)); }
 430         ;
 431
 432 method  :       METHOD
 433         |       scalar
 434         ;
 435
 436 subscripted:    star '{' expr ';' '}'
 437                         { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); }
 438         |       scalar '[' expr ']'
 439                         { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
 440         |       term ARROW '[' expr ']'
 441                         { $$ = newBINOP(OP_AELEM, 0,
 442                                         ref(newAVREF($1),OP_RV2AV),
 443                                         scalar($4));}
 444         |       subscripted '[' expr ']'
 445                         { $$ = newBINOP(OP_AELEM, 0,
 446                                         ref(newAVREF($1),OP_RV2AV),
 447                                         scalar($3));}
 448         |       scalar '{' expr ';' '}'
 449                         { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
 450                             PL_expect = XOPERATOR; }
 451         |       term ARROW '{' expr ';' '}'
 452                         { $$ = newBINOP(OP_HELEM, 0,
 453                                         ref(newHVREF($1),OP_RV2HV),
 454                                         jmaybe($4));
 455                             PL_expect = XOPERATOR; }
 456         |       subscripted '{' expr ';' '}'
 457                         { $$ = newBINOP(OP_HELEM, 0,
 458                                         ref(newHVREF($1),OP_RV2HV),
 459                                         jmaybe($3));
 460                             PL_expect = XOPERATOR; }
 461         |       term ARROW '(' ')'
 462                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 463                                    newCVREF(0, scalar($1))); }
 464         |       term ARROW '(' expr ')'
 465                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 466                                    append_elem(OP_LIST, $4,
 467                                        newCVREF(0, scalar($1)))); }
 468
 469         |       subscripted '(' expr ')'
 470                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 471                                    append_elem(OP_LIST, $3,
 472                                                newCVREF(0, scalar($1)))); }
 473         |       subscripted '(' ')'
 474                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 475                                    newCVREF(0, scalar($1))); }
 476
 477
 478
 479 term    :       term ASSIGNOP term
 480                         { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
 481         |       term POWOP term
 482                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 483         |       term MULOP term
 484                         {   if ($2 != OP_REPEAT)
 485                                 scalar($1);
 486                             $$ = newBINOP($2, 0, $1, scalar($3)); }
 487         |       term ADDOP term
 488                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 489         |       term SHIFTOP term
 490                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 491         |       term RELOP term
 492                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 493         |       term EQOP term
 494                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 495         |       term BITANDOP term
 496                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 497         |       term BITOROP term
 498                         { $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
 499         |       term DOTDOT term
 500                         { $$ = newRANGE($2, scalar($1), scalar($3));}
 501         |       term ANDAND term
 502                         { $$ = newLOGOP(OP_AND, 0, $1, $3); }
 503         |       term OROR term
 504                         { $$ = newLOGOP(OP_OR, 0, $1, $3); }
 505         |       term '?' term ':' term
 506                         { $$ = newCONDOP(0, $1, $3, $5); }
 507         |       term MATCHOP term
 508                         { $$ = bind_match($2, $1, $3); }
 509
 510         |       '-' term %prec UMINUS
 511                         { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
 512         |       '+' term %prec UMINUS
 513                         { $$ = $2; }
 514         |       '!' term
 515                         { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
 516         |       '~' term
 517                         { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
 518         |       REFGEN term
 519                         { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); }
 520         |       term POSTINC
 521                         { $$ = newUNOP(OP_POSTINC, 0,
 522                                         mod(scalar($1), OP_POSTINC)); }
 523         |       term POSTDEC
 524                         { $$ = newUNOP(OP_POSTDEC, 0,
 525                                         mod(scalar($1), OP_POSTDEC)); }
 526         |       PREINC term
 527                         { $$ = newUNOP(OP_PREINC, 0,
 528                                         mod(scalar($2), OP_PREINC)); }
 529         |       PREDEC term
 530                         { $$ = newUNOP(OP_PREDEC, 0,
 531                                         mod(scalar($2), OP_PREDEC)); }
 532         |       myattrterm      %prec UNIOP
 533                         { $$ = $1; }
 534         |       LOCAL term      %prec UNIOP
 535                         { $$ = localize($2,$1); }
 536         |       '(' expr ')'
 537                         { $$ = sawparens($2); }
 538         |       '(' ')'
 539                         { $$ = sawparens(newNULLLIST()); }
 540         |       '[' expr ']'
 541                         { $$ = newANONLIST($2); }
 542         |       '[' ']'
 543                         { $$ = newANONLIST(Nullop); }
 544         |       HASHBRACK expr ';' '}'                  %prec '('
 545                         { $$ = newANONHASH($2); }
 546         |       HASHBRACK ';' '}'                               %prec '('
 547                         { $$ = newANONHASH(Nullop); }
 548         |       ANONSUB startanonsub proto subattrlist block    %prec '('
 549                         { $$ = newANONATTRSUB($2, $3, $4, $5); }
 550         |       scalar  %prec '('
 551                         { $$ = $1; }
 552         |       star    %prec '('
 553                         { $$ = $1; }
 554         |       hsh     %prec '('
 555                         { $$ = $1; }
 556         |       ary     %prec '('
 557                         { $$ = $1; }
 558         |       arylen  %prec '('
 559                         { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
 560         |       subscripted
 561                         { $$ = $1; }
 562         |       '(' expr ')' '[' expr ']'
 563                         { $$ = newSLICEOP(0, $5, $2); }
 564         |       '(' ')' '[' expr ']'
 565                         { $$ = newSLICEOP(0, $4, Nullop); }
 566         |       ary '[' expr ']'
 567                         { $$ = prepend_elem(OP_ASLICE,
 568                                 newOP(OP_PUSHMARK, 0),
 569                                     newLISTOP(OP_ASLICE, 0,
 570                                         list($3),
 571                                         ref($1, OP_ASLICE))); }
 572         |       ary '{' expr ';' '}'
 573                         { $$ = prepend_elem(OP_HSLICE,
 574                                 newOP(OP_PUSHMARK, 0),
 575                                     newLISTOP(OP_HSLICE, 0,
 576                                         list($3),
 577                                         ref(oopsHV($1), OP_HSLICE)));
 578                             PL_expect = XOPERATOR; }
 579         |       THING   %prec '('
 580                         { $$ = $1; }
 581         |       amper
 582                         { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); }
 583         |       amper '(' ')'
 584                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
 585         |       amper '(' expr ')'
 586                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 587                             append_elem(OP_LIST, $3, scalar($1))); }
 588         |       NOAMP WORD listexpr
 589                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 590                             append_elem(OP_LIST, $3, scalar($2))); }
 591         |       DO term %prec UNIOP
 592                         { $$ = dofile($2); }
 593         |       DO block        %prec '('
 594                         { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
 595         |       DO WORD '(' ')'
 596                         { $$ = newUNOP(OP_ENTERSUB,
 597                             OPf_SPECIAL|OPf_STACKED,
 598                             prepend_elem(OP_LIST,
 599                                 scalar(newCVREF(
 600                                     (OPpENTERSUB_AMPER<<8),
 601                                     scalar($2)
 602                                 )),Nullop)); dep();}
 603         |       DO WORD '(' expr ')'
 604                         { $$ = newUNOP(OP_ENTERSUB,
 605                             OPf_SPECIAL|OPf_STACKED,
 606                             append_elem(OP_LIST,
 607                                 $4,
 608                                 scalar(newCVREF(
 609                                     (OPpENTERSUB_AMPER<<8),
 610                                     scalar($2)
 611                                 )))); dep();}
 612         |       DO scalar '(' ')'
 613                         { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
 614                             prepend_elem(OP_LIST,
 615                                 scalar(newCVREF(0,scalar($2))), Nullop)); dep();}
 616         |       DO scalar '(' expr ')'
 617                         { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
 618                             prepend_elem(OP_LIST,
 619                                 $4,
 620                                 scalar(newCVREF(0,scalar($2))))); dep();}
 621         |       LOOPEX
 622                         { $$ = newOP($1, OPf_SPECIAL);
 623                             PL_hints |= HINT_BLOCK_SCOPE; }
 624         |       LOOPEX term
 625                         { $$ = newLOOPEX($1,$2); }
 626         |       NOTOP argexpr
 627                         { $$ = newUNOP(OP_NOT, 0, scalar($2)); }
 628         |       UNIOP
 629                         { $$ = newOP($1, 0); }
 630         |       UNIOP block
 631                         { $$ = newUNOP($1, 0, $2); }
 632         |       UNIOP term
 633                         { $$ = newUNOP($1, 0, $2); }
 634         |       UNIOPSUB term
 635                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 636                             append_elem(OP_LIST, $2, scalar($1))); }
 637         |       FUNC0
 638                         { $$ = newOP($1, 0); }
 639         |       FUNC0 '(' ')'
 640                         { $$ = newOP($1, 0); }
 641         |       FUNC0SUB
 642                         { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
 643                                 scalar($1)); }
 644         |       FUNC1 '(' ')'
 645                         { $$ = newOP($1, OPf_SPECIAL); }
 646         |       FUNC1 '(' expr ')'
 647                         { $$ = newUNOP($1, 0, $3); }
 648         |       PMFUNC '(' term ')'
 649                         { $$ = pmruntime($1, $3, Nullop); }
 650         |       PMFUNC '(' term ',' term ')'
 651                         { $$ = pmruntime($1, $3, $5); }
 652         |       WORD
 653         |       listop
 654         ;
 655
 656 myattrterm:     MY myterm myattrlist
 657                         { $$ = my_attrs($2,$3); }
 658         |       MY myterm
 659                         { $$ = localize($2,$1); }
 660         ;
 661
 662 myterm  :       '(' expr ')'
 663                         { $$ = sawparens($2); }
 664         |       '(' ')'
 665                         { $$ = sawparens(newNULLLIST()); }
 666         |       scalar  %prec '('
 667                         { $$ = $1; }
 668         |       hsh     %prec '('
 669                         { $$ = $1; }
 670         |       ary     %prec '('
 671                         { $$ = $1; }
 672         ;
 673
 674 listexpr:       /* NULL */ %prec PREC_LOW
 675                         { $$ = Nullop; }
 676         |       argexpr    %prec PREC_LOW
 677                         { $$ = $1; }
 678         ;
 679
 680 listexprcom:    /* NULL */
 681                         { $$ = Nullop; }
 682         |       expr
 683                         { $$ = $1; }
 684         |       expr ','
 685                         { $$ = $1; }
 686         ;
 687
 688 my_scalar:      scalar
 689                         { PL_in_my = 0; $$ = my($1); }
 690         ;
 691
 692 amper   :       '&' indirob
 693                         { $$ = newCVREF($1,$2); }
 694         ;
 695
 696 scalar  :       '$' indirob
 697                         { $$ = newSVREF($2); }
 698         ;
 699
 700 ary     :       '@' indirob
 701                         { $$ = newAVREF($2); }
 702         ;
 703
 704 hsh     :       '%' indirob
 705                         { $$ = newHVREF($2); }
 706         ;
 707
 708 arylen  :       DOLSHARP indirob
 709                         { $$ = newAVREF($2); }
 710         ;
 711
 712 star    :       '*' indirob
 713                         { $$ = newGVREF(0,$2); }
 714         ;
 715
 716 indirob :       WORD
 717                         { $$ = scalar($1); }
 718         |       scalar %prec PREC_LOW
 719                         { $$ = scalar($1);  }
 720         |       block
 721                         { $$ = scope($1); }
 722
 723         |       PRIVATEREF
 724                         { $$ = $1; }
 725         ;
 726
 727 %% /* PROGRAM */
 728
 729 /* more stuff added to make perly_c.diff easier to apply */
 730
 731 #ifdef yyparse
 732 #undef yyparse
 733 #endif
 734 #define yyparse() Perl_yyparse(pTHX)
 735