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