X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/e9bdcc27a1d9b3f31b4d8c3678dd1346910c9b4d..c0888b2172d1f2ba9efb15c34b86c07026be9abe:/perly.y diff --git a/perly.y b/perly.y index 7d39242..1d20b04 100644 --- a/perly.y +++ b/perly.y @@ -1,6 +1,6 @@ /* perly.y * - * Copyright (c) 1991-2002, Larry Wall + * Copyright (c) 1991-2002, 2003, 2004 Larry Wall * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. @@ -12,44 +12,20 @@ * All that is gold does not glitter, not all those who wander are lost.' */ -%{ -#include "EXTERN.h" -#define PERL_IN_PERLY_C -#include "perl.h" -#ifdef EBCDIC -#undef YYDEBUG -#endif -#define dep() deprecate("\"do\" to call subroutines") - -/* stuff included here to make perly_c.diff apply better */ - -#define yydebug PL_yydebug -#define yynerrs PL_yynerrs -#define yyerrflag PL_yyerrflag -#define yychar PL_yychar -#define yyval PL_yyval -#define yylval PL_yylval - -struct ysv { - short* yyss; - YYSTYPE* yyvs; - int oldyydebug; - int oldyynerrs; - int oldyyerrflag; - int oldyychar; - YYSTYPE oldyyval; - YYSTYPE oldyylval; -}; - -static void yydestruct(pTHX_ void *ptr); - -%} +/* This file holds the grammar for the Perl language. If edited, you need + * to run regen_perly.pl, which re-creates the files perly.h, perly.tab + * and perly.act which are derived from this. + * + * The main job of of this grammar is to call the various newFOO() + * functions in op.c to build a syntax tree of OP structs. + * It relies on the lexer in toke.c to do the tokenizing. + */ -%start prog +/* Make the parser re-entrant. */ -%{ -#if 0 /* get this from perly.h instead */ -%} +%pure_parser + +%start prog %union { I32 ival; @@ -58,16 +34,6 @@ static void yydestruct(pTHX_ void *ptr); GV *gvval; } -%{ -#endif /* 0 */ - -#ifdef USE_PURE_BISON -#define YYLEX_PARAM (&yychar) -#define yylex yylex_r -#endif - -%} - %token '{' %token WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF @@ -79,14 +45,14 @@ static void yydestruct(pTHX_ void *ptr); %token FUNC0 FUNC1 FUNC UNIOP LSTOP %token RELOP EQOP MULOP ADDOP %token DOLSHARP DO HASHBRACK NOAMP -%token LOCAL MY MYSUB +%token LOCAL MY MYSUB REQUIRE %token COLONATTR -%type prog decl format startsub startanonsub startformsub -%type progstart remember mremember '&' +%type prog decl format startsub startanonsub startformsub mintro +%type progstart remember mremember '&' savescope %type block mblock lineseq line loop cond else %type expr term subscripted scalar ary hsh arylen star amper sideff -%type argexpr nexpr texpr iexpr mexpr mnexpr mtexpr miexpr +%type argexpr nexpr texpr iexpr mexpr mnexpr miexpr %type listexpr listexprcom indirob listop method %type formname subname proto subbody cont my_scalar %type subattrlist myattrlist mysubrout myattrterm myterm @@ -144,9 +110,6 @@ remember: /* NULL */ /* start a full lexical scope */ progstart: { -#if defined(YYDEBUG) && defined(DEBUGGING) - yydebug = (DEBUG_p_TEST); -#endif PL_expect = XSTATE; $$ = block_start(TRUE); } ; @@ -162,16 +125,20 @@ mremember: /* NULL */ /* start a partial lexical scope */ { $$ = block_start(FALSE); } ; +savescope: /* NULL */ /* remember stack pos in case of error */ + { $$ = PL_savestack_ix; } + /* A collection of "lines" in the program */ lineseq : /* NULL */ { $$ = Nullop; } | lineseq decl { $$ = $1; } - | lineseq line - { $$ = append_list(OP_LINESEQ, - (LISTOP*)$1, (LISTOP*)$2); + | lineseq savescope line + { LEAVE_SCOPE($2); + $$ = append_list(OP_LINESEQ, + (LISTOP*)$1, (LISTOP*)$3); PL_pad_reset_pending = TRUE; - if ($1 && $2) PL_hints |= HINT_BLOCK_SCOPE; } + if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; } ; /* A "line" in the program */ @@ -240,18 +207,18 @@ cont : /* NULL */ ; /* Loops: while, until, for, and a bare block */ -loop : label WHILE '(' remember mtexpr ')' mblock cont +loop : label WHILE '(' remember texpr ')' mintro mblock cont { PL_copline = (line_t)$2; $$ = block_end($4, newSTATEOP(0, $1, newWHILEOP(0, 1, (LOOP*)Nullop, - $2, $5, $7, $8))); } - | label UNTIL '(' remember miexpr ')' mblock cont + $2, $5, $8, $9, $7))); } + | label UNTIL '(' remember iexpr ')' mintro mblock cont { PL_copline = (line_t)$2; $$ = block_end($4, newSTATEOP(0, $1, newWHILEOP(0, 1, (LOOP*)Nullop, - $2, $5, $7, $8))); } + $2, $5, $8, $9, $7))); } | label FOR MY remember my_scalar '(' mexpr ')' mblock cont { $$ = block_end($4, newFOROP(0, $1, (line_t)$2, $5, $7, $9, $10)); } @@ -262,14 +229,15 @@ loop : label WHILE '(' remember mtexpr ')' mblock cont | label FOR '(' remember mexpr ')' mblock cont { $$ = block_end($4, newFOROP(0, $1, (line_t)$2, Nullop, $5, $7, $8)); } - | label FOR '(' remember mnexpr ';' mtexpr ';' mnexpr ')' mblock + | label FOR '(' remember mnexpr ';' texpr ';' mintro mnexpr ')' + mblock /* basically fake up an initialize-while lineseq */ { OP *forop; PL_copline = (line_t)$2; forop = newSTATEOP(0, $1, newWHILEOP(0, 1, (LOOP*)Nullop, $2, scalar($7), - $11, $9)); + $12, $10, $9)); if ($5) { forop = append_elem(OP_LINESEQ, newSTATEOP(0, ($1?savepv($1):Nullch), @@ -281,9 +249,15 @@ loop : label WHILE '(' remember mtexpr ')' mblock cont | label block cont /* a block is a loop that happens once */ { $$ = newSTATEOP(0, $1, newWHILEOP(0, 1, (LOOP*)Nullop, - NOLINE, Nullop, $2, $3)); } + NOLINE, Nullop, $2, $3, 0)); } ; +/* determine whether there are any new my declarations */ +mintro : /* NULL */ + { $$ = (PL_min_intro_pending && + PL_max_intro_pending >= PL_min_intro_pending); + intro_my(); } + /* Normal expression */ nexpr : /* NULL */ { $$ = Nullop; } @@ -310,10 +284,6 @@ mnexpr : nexpr { $$ = $1; intro_my(); } ; -mtexpr : texpr - { $$ = $1; intro_my(); } - ; - miexpr : iexpr { $$ = $1; intro_my(); } ; @@ -368,7 +338,7 @@ startformsub: /* NULL */ /* start a format subroutine scope */ ; /* Name of a subroutine - must be a bareword, could be special */ -subname : WORD { STRLEN n_a; char *name = SvPV(((SVOP*)$1)->op_sv,n_a); +subname : WORD { const char *const name = SvPV_nolen_const(((SVOP*)$1)->op_sv); if (strEQ(name, "BEGIN") || strEQ(name, "END") || strEQ(name, "INIT") || strEQ(name, "CHECK")) CvSPECIAL_on(PL_compcv); @@ -431,7 +401,7 @@ argexpr : argexpr ',' ; /* List operators */ -listop : LSTOP indirob argexpr /* print $fh @args */ +listop : LSTOP indirob argexpr /* map {...} @args or print $fh @args */ { $$ = convert($1, OPf_STACKED, prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); } | FUNC '(' indirob expr ')' /* print ($fh @args */ @@ -460,7 +430,7 @@ listop : LSTOP indirob argexpr /* print $fh @args */ { $$ = convert($1, 0, $2); } | FUNC '(' listexprcom ')' /* print (@args) */ { $$ = convert($1, 0, $3); } - | LSTOPSUB startanonsub block /* map { foo } ... */ + | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */ { $3 = newANONATTRSUB($2, 0, Nullop, $3); } listexpr %prec LSTOP /* ... @bar */ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, @@ -477,7 +447,8 @@ method : METHOD subscripted: star '{' expr ';' '}' /* *main::{something} */ /* In this and all the hash accessors, ';' is * provided by the tokeniser */ - { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); } + { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); + PL_expect = XOPERATOR; } | scalar '[' expr ']' /* $array[$element] */ { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); } | term ARROW '[' expr ']' /* somearef->[$element] */ @@ -516,6 +487,10 @@ subscripted: star '{' expr ';' '}' /* *main::{something} */ | subscripted '(' ')' /* $foo->{bar}->() */ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, newCVREF(0, scalar($1))); } + | '(' expr ')' '[' expr ']' /* list slice */ + { $$ = newSLICEOP(0, $5, $2); } + | '(' ')' '[' expr ']' /* empty list slice! */ + { $$ = newSLICEOP(0, $4, Nullop); } ; /* Binary operators between terms */ @@ -591,7 +566,7 @@ anonymous: '[' expr ']' /* Things called with "do" */ termdo : DO term %prec UNIOP /* do $filename */ - { $$ = dofile($2); } + { $$ = dofile($2, $1); } | DO block %prec '(' /* do { code */ { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); } | DO WORD '(' ')' /* do somesub() */ @@ -651,10 +626,6 @@ term : termbinop { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));} | subscripted { $$ = $1; } - | '(' expr ')' '[' expr ']' /* list slice */ - { $$ = newSLICEOP(0, $5, $2); } - | '(' ')' '[' expr ']' /* empty list slice! */ - { $$ = newSLICEOP(0, $4, Nullop); } | ary '[' expr ']' /* array slice */ { $$ = prepend_elem(OP_ASLICE, newOP(OP_PUSHMARK, 0), @@ -689,10 +660,14 @@ term : termbinop { $$ = newUNOP(OP_NOT, 0, scalar($2)); } | UNIOP /* Unary op, $_ implied */ { $$ = newOP($1, 0); } - | UNIOP block /* eval { foo }, I *think* */ + | UNIOP block /* eval { foo } */ { $$ = newUNOP($1, 0, $2); } | UNIOP term /* Unary op */ { $$ = newUNOP($1, 0, $2); } + | REQUIRE /* require, $_ implied */ + { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); } + | REQUIRE term /* require Foo */ + { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); } | UNIOPSUB term /* Sub treated as unop */ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, append_elem(OP_LIST, $2, scalar($1))); } @@ -704,13 +679,12 @@ term : termbinop { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); } | FUNC1 '(' ')' /* not () */ - { $$ = newOP($1, OPf_SPECIAL); } + { $$ = $1 == OP_NOT ? newUNOP($1, 0, newSVOP(OP_CONST, 0, newSViv(0))) + : newOP($1, OPf_SPECIAL); } | FUNC1 '(' expr ')' /* not($foo) */ { $$ = newUNOP($1, 0, $3); } - | PMFUNC '(' term ')' /* split (/foo/) */ - { $$ = pmruntime($1, $3, Nullop); } - | PMFUNC '(' term ',' term ')' /* split (/foo/,$bar) */ - { $$ = pmruntime($1, $3, $5); } + | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */ + { $$ = pmruntime($1, $3, 1); } | WORD | listop ; @@ -791,13 +765,3 @@ indirob : WORD | PRIVATEREF { $$ = $1; } ; - -%% /* PROGRAM */ - -/* more stuff added to make perly_c.diff easier to apply */ - -#ifdef yyparse -#undef yyparse -#endif -#define yyparse() Perl_yyparse(pTHX) -