X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/ca06c01c30b19d0094642f2e317dadf13d4509cd..bc641c27709fc92be4f44291a8f5fa3a483662fd:/perly.c diff --git a/perly.c b/perly.c index e3f9357..4e3a7e2 100644 --- a/perly.c +++ b/perly.c @@ -1,6 +1,6 @@ /* perly.c * - * Copyright (c) 2004, 2005, 2006 Larry Wall and others + * Copyright (c) 2004, 2005, 2006, 2007, by Larry Wall and others * * You may distribute under the terms of either the GNU General Public * License or the Artistic License, as specified in the README file. @@ -24,11 +24,6 @@ * This is controlled by the PERL_IN_MADLY_C define. */ - - -/* allow stack size to grow effectively without limit */ -#define YYMAXDEPTH 10000000 - #include "EXTERN.h" #define PERL_IN_PERLY_C #include "perl.h" @@ -50,42 +45,13 @@ typedef signed char yysigned_char; # define YYSIZE_T size_t -#define yyerrok (yyerrstatus = 0) -#define yyclearin (yychar = YYEMPTY) -#define YYEMPTY (-2) #define YYEOF 0 +#define YYTERROR 1 #define YYACCEPT goto yyacceptlab #define YYABORT goto yyabortlab #define YYERROR goto yyerrlab1 - -/* Like YYERROR except do call yyerror. This remains here temporarily - to ease the transition to the new meaning of YYERROR, for GCC. - Once GCC version 2 has supplanted version 1, this can go. */ - -#define YYFAIL goto yyerrlab - -#define YYRECOVERING() (!!yyerrstatus) - -#define YYBACKUP(Token, Value) \ -do \ - if (yychar == YYEMPTY && yylen == 1) { \ - yychar = (Token); \ - yylval = (Value); \ - yytoken = YYTRANSLATE (yychar); \ - YYPOPSTACK; \ - goto yybackup; \ - } \ - else { \ - yyerror ("syntax error: cannot back up"); \ - YYERROR; \ - } \ -while (0) - -#define YYTERROR 1 -#define YYERRCODE 256 - /* Enable debugging if requested. */ #ifdef DEBUGGING @@ -131,62 +97,62 @@ yysymprint(pTHX_ PerlIO * const yyoutput, int yytype, const YYSTYPE * const yyva /* yy_stack_print() - * print the top 8 items on the parse stack. The args have the same - * meanings as the local vars in yyparse() of the same name */ + * print the top 8 items on the parse stack. + */ static void -yy_stack_print (pTHX_ const short *yyss, const short *yyssp, const YYSTYPE *yyvs, const char**yyns) +yy_stack_print (pTHX_ const yy_parser *parser) { - int i; - int start = 1; - int count = (int)(yyssp - yyss); + const yy_stack_frame *ps, *min; - if (count > 8) { - start = count - 8 + 1; - count = 8; - } + min = parser->ps - 8 + 1; + if (min <= parser->stack) + min = parser->stack + 1; PerlIO_printf(Perl_debug_log, "\nindex:"); - for (i=0; i < count; i++) - PerlIO_printf(Perl_debug_log, " %8d", start+i); + for (ps = min; ps <= parser->ps; ps++) + PerlIO_printf(Perl_debug_log, " %8d", ps - parser->stack); + PerlIO_printf(Perl_debug_log, "\nstate:"); - for (i=0; i < count; i++) - PerlIO_printf(Perl_debug_log, " %8d", yyss[start+i]); + for (ps = min; ps <= parser->ps; ps++) + PerlIO_printf(Perl_debug_log, " %8d", ps->state); + PerlIO_printf(Perl_debug_log, "\ntoken:"); - for (i=0; i < count; i++) - PerlIO_printf(Perl_debug_log, " %8.8s", yyns[start+i]); + for (ps = min; ps <= parser->ps; ps++) + PerlIO_printf(Perl_debug_log, " %8.8s", ps->name); + PerlIO_printf(Perl_debug_log, "\nvalue:"); - for (i=0; i < count; i++) { - switch (yy_type_tab[yystos[yyss[start+i]]]) { + for (ps = min; ps <= parser->ps; ps++) { + switch (yy_type_tab[yystos[ps->state]]) { case toketype_opval: PerlIO_printf(Perl_debug_log, " %8.8s", - yyvs[start+i].opval - ? PL_op_name[yyvs[start+i].opval->op_type] + ps->val.opval + ? PL_op_name[ps->val.opval->op_type] : "(Nullop)" ); break; #ifndef PERL_IN_MADLY_C case toketype_p_tkval: PerlIO_printf(Perl_debug_log, " %8.8s", - yyvs[start+i].pval ? yyvs[start+i].pval : "(NULL)"); + ps->val.pval ? ps->val.pval : "(NULL)"); break; case toketype_i_tkval: #endif case toketype_ival: - PerlIO_printf(Perl_debug_log, " %8"IVdf, (IV)yyvs[start+i].ival); + PerlIO_printf(Perl_debug_log, " %8"IVdf, (IV)ps->val.ival); break; default: - PerlIO_printf(Perl_debug_log, " %8"UVxf, (UV)yyvs[start+i].ival); + PerlIO_printf(Perl_debug_log, " %8"UVxf, (UV)ps->val.ival); } } PerlIO_printf(Perl_debug_log, "\n\n"); } -# define YY_STACK_PRINT(yyss, yyssp, yyvs, yyns) \ -do { \ - if (yydebug && DEBUG_v_TEST) \ - yy_stack_print (aTHX_ (yyss), (yyssp), (yyvs), (yyns)); \ +# define YY_STACK_PRINT(parser) \ +do { \ + if (yydebug && DEBUG_v_TEST) \ + yy_stack_print (aTHX_ parser); \ } while (0) @@ -216,110 +182,54 @@ do { \ #else /* !DEBUGGING */ # define YYDPRINTF(Args) # define YYDSYMPRINTF(Title, Token, Value) -# define YY_STACK_PRINT(yyss, yyssp, yyvs, yyns) +# define YY_STACK_PRINT(parser) # define YY_REDUCE_PRINT(Rule) #endif /* !DEBUGGING */ - -/* YYINITDEPTH -- initial size of the parser's stacks. */ -#ifndef YYINITDEPTH -# define YYINITDEPTH 200 -#endif - - -#if YYERROR_VERBOSE -# ifndef yystrlen -# if defined (__GLIBC__) && defined (_STRING_H) -# define yystrlen strlen -# else -/* Return the length of YYSTR. */ -static YYSIZE_T -yystrlen (const char *yystr) -{ - register const char *yys = yystr; - - while (*yys++ != '\0') - continue; - - return yys - yystr - 1; -} -# endif -# endif - -# ifndef yystpcpy -# if defined (__GLIBC__) && defined (_STRING_H) && defined (_GNU_SOURCE) -# define yystpcpy stpcpy -# else -/* Copy YYSRC to YYDEST, returning the address of the terminating '\0' in - YYDEST. */ -static char * -yystpcpy (pTHX_ char *yydest, const char *yysrc) -{ - register char *yyd = yydest; - register const char *yys = yysrc; - - while ((*yyd++ = *yys++) != '\0') - continue; - - return yyd - 1; -} -# endif -# endif - -#endif /* !YYERROR_VERBOSE */ - - -/* a snapshot of the current stack position variables for use by - * S_clear_yystack */ - -typedef struct { - short *yyss; - short *yyssp; - YYSTYPE *yyvsp; - AV **yypsp; - int yylen; -} yystack_positions; - /* called during cleanup (via SAVEDESTRUCTOR_X) to free any items on the * parse stack, thus avoiding leaks if we die */ static void -S_clear_yystack(pTHX_ const void *p) +S_clear_yystack(pTHX_ const yy_parser *parser) { - yystack_positions *y = (yystack_positions*) p; + yy_stack_frame *ps = parser->ps; int i; - if (!y->yyss) + if (!parser->stack || ps == parser->stack) return; + YYDPRINTF ((Perl_debug_log, "clearing the parse stack\n")); - /* Freeing ops on the stack, and the op_latefree/op_latefreed flags: + /* Freeing ops on the stack, and the op_latefree / op_latefreed / + * op_attached flags: * * When we pop tokens off the stack during error recovery, or when * we pop all the tokens off the stack after a die during a shift or - * reduce (ie Perl_croak somewhere in yylex(), or in one of the - * newFOO() functions, then its possible that some of these tokens are + * reduce (i.e. Perl_croak somewhere in yylex() or in one of the + * newFOO() functions), then it's possible that some of these tokens are * of type opval, pointing to an OP. All these ops are orphans; each is * its own miniature subtree that has not yet been attached to a - * larger tree. In this case, we shoould clearly free the op (making - * sure, for each op we free thyat we have PL_comppad pointing to the + * larger tree. In this case, we should clearly free the op (making + * sure, for each op we free that we have PL_comppad pointing to the * right place for freeing any SVs attached to the op in threaded * builds. * - * However, there is a particular problem if we die in newFOO called + * However, there is a particular problem if we die in newFOO() called * by a reducing action; e.g. * * foo : bar baz boz * { $$ = newFOO($1,$2,$3) } * * where - * OP *newFOO { .... croak .... } + * OP *newFOO { ....; if (...) croak; .... } * * In this case, when we come to clean bar baz and boz off the stack, * we don't know whether newFOO() has already: * * freed them - * * left them as it + * * left them as is * * attached them to part of a larger tree + * * attached them to PL_compcv + * * attached them to PL_compcv then freed it (as in BEGIN {die } ) * * To get round this problem, we set the flag op_latefree on every op * that gets pushed onto the parser stack. If op_free() sees this @@ -330,43 +240,71 @@ S_clear_yystack(pTHX_ const void *p) * reduced, call op_free with op_latefree=1. This ensures that all ops * hanging off these op are freed, but the reducing ops themselces are * just undefed. Then we set op_latefreed=0 on *all* ops on the stack - * and free them. A little though should convince you that this - * two-part approach to the reducing ops should handle all three cases - * above safely. + * and free them. A little thought should convince you that this + * two-part approach to the reducing ops should handle the first three + * cases above safely. + * + * In the case of attaching to PL_compcv (currently just newATTRSUB + * does this), then we set the op_attached flag on the op that has + * been so attached, then avoid doing the final op_free during + * cleanup, on the assumption that it will happen (or has already + * happened) when PL_compcv is freed. + * + * Note this is fairly fragile mechanism. A more robust approach + * would be to use two of these flag bits as 2-bit reference count + * field for each op, indicating whether it is pointed to from: + * * a parent op + * * the parser stack + * * a CV + * but this would involve reworking all code (core and external) that + * manipulate op trees. */ - /* free any reducing ops (1st pass) */ + /* clear any reducing ops (1st pass) */ - for (i=0; i< y->yylen; i++) { - if (yy_type_tab[yystos[y->yyssp[-i]]] == toketype_opval - && y->yyvsp[-i].opval) { - if (y->yypsp[-i] != PL_comppad) { - PAD_RESTORE_LOCAL(y->yypsp[-i]); + for (i=0; i< parser->yylen; i++) { + if (yy_type_tab[yystos[ps[-i].state]] == toketype_opval + && ps[-i].val.opval) { + if ( ! (ps[-i].val.opval->op_attached + && !ps[-i].val.opval->op_latefreed)) + { + if (ps[-i].comppad != PL_comppad) { + PAD_RESTORE_LOCAL(ps[-i].comppad); + } + op_free(ps[-i].val.opval); } - op_free(y->yyvsp[-i].opval); } } /* now free whole the stack, including the just-reduced ops */ - while (y->yyssp > y->yyss) { - if (yy_type_tab[yystos[*y->yyssp]] == toketype_opval - && y->yyvsp->opval) + while (ps > parser->stack) { + if (yy_type_tab[yystos[ps->state]] == toketype_opval + && ps->val.opval) { - if (*y->yypsp != PL_comppad) { - PAD_RESTORE_LOCAL(*y->yypsp); + if (ps->comppad != PL_comppad) { + PAD_RESTORE_LOCAL(ps->comppad); } YYDPRINTF ((Perl_debug_log, "(freeing op)\n")); - y->yyvsp->opval->op_latefree = 0; - op_free(y->yyvsp->opval); + ps->val.opval->op_latefree = 0; + if (!(ps->val.opval->op_attached && !ps->val.opval->op_latefreed)) + op_free(ps->val.opval); } - y->yyvsp--; - y->yyssp--; - y->yypsp--; + ps--; } } +/* delete a parser object */ +#ifndef PERL_IN_MADLY_C +void +Perl_parser_free(pTHX_ const yy_parser *parser) +{ + S_clear_yystack(aTHX_ parser); + Safefree(parser->stack); + PL_parser = parser->old_parser; +} +#endif /*----------. | yyparse. | @@ -380,66 +318,23 @@ Perl_yyparse (pTHX) #endif { dVAR; - int yychar; /* The lookahead symbol. */ - YYSTYPE yylval; /* The semantic value of the lookahead symbol. */ - int yynerrs; /* Number of syntax errors so far. */ register int yystate; register int yyn; int yyresult; - /* Number of tokens to shift before error messages enabled. */ - int yyerrstatus; /* Lookahead token as an internal (translated) token number. */ int yytoken = 0; - /* three stacks and their tools: - yyss: related to states, - yyvs: related to semantic values, - yyps: current value of PL_comppad for each state - - - Refer to the stacks thru separate pointers, to allow yyoverflow - to reallocate them elsewhere. */ - - /* The state stack. */ - short *yyss; - register short *yyssp; - - /* The semantic value stack. */ - YYSTYPE *yyvs; - register YYSTYPE *yyvsp; - - AV **yyps; - AV **yypsp; - - /* for ease of re-allocation and automatic freeing, have three SVs whose - * SvPVX points to the stacks */ - SV *yyss_sv, *yyvs_sv, *yyps_sv; - SV *ss_save_sv; - yystack_positions *ss_save; - - -#ifdef DEBUGGING - /* maintain also a stack of token/rule names for debugging with -Dpv */ - const char **yyns, **yynsp; - SV *yyns_sv; -# define YYPOPSTACK (yyvsp--, yyssp--, yypsp--, yynsp--) -#else -# define YYPOPSTACK (yyvsp--, yyssp--, yypsp--) -#endif - + register yy_parser *parser; /* the parser object */ + register yy_stack_frame *ps; /* current parser stack frame */ - YYSIZE_T yystacksize = YYINITDEPTH; +#define YYPOPSTACK parser->ps = --ps +#define YYPUSHSTACK parser->ps = ++ps - /* The variables used to return semantic value and location from the - action routines. */ + /* The variable used to return semantic value and location from the + action routines: ie $$. */ YYSTYPE yyval; - - /* When reducing, the number of symbols on the RHS of the reduced - rule. */ - int yylen; - #ifndef PERL_IN_MADLY_C # ifdef PERL_MAD if (PL_madskills) @@ -449,128 +344,48 @@ Perl_yyparse (pTHX) YYDPRINTF ((Perl_debug_log, "Starting parse\n")); - ENTER; /* force stack free before we return */ - SAVEVPTR(PL_yycharp); - SAVEVPTR(PL_yylvalp); - PL_yycharp = &yychar; /* so PL_yyerror() can access it */ - PL_yylvalp = &yylval; /* so various functions in toke.c can access it */ - - yyss_sv = newSV(YYINITDEPTH * sizeof(short)); - yyvs_sv = newSV(YYINITDEPTH * sizeof(YYSTYPE)); - yyps_sv = newSV(YYINITDEPTH * sizeof(AV*)); - ss_save_sv = newSV(sizeof(yystack_positions)); - SAVEFREESV(yyss_sv); - SAVEFREESV(yyvs_sv); - SAVEFREESV(yyps_sv); - SAVEFREESV(ss_save_sv); - yyss = (short *) SvPVX(yyss_sv); - yyvs = (YYSTYPE *) SvPVX(yyvs_sv); - yyps = (AV **) SvPVX(yyps_sv); - ss_save = (yystack_positions *) SvPVX(ss_save_sv); - - ss_save->yyss = NULL; /* disarm stack cleanup */ - /* cleanup the parse stack on premature exit */ - SAVEDESTRUCTOR_X(S_clear_yystack, (void*) ss_save); - - /* note that elements zero of yyvs and yyns are not used */ - yyssp = yyss; - yyvsp = yyvs; - yypsp = yyps; -#ifdef DEBUGGING - yyns_sv = newSV(YYINITDEPTH * sizeof(char *)); - SAVEFREESV(yyns_sv); - /* XXX This seems strange to cast char * to char ** */ - yyns = (const char **) SvPVX(yyns_sv); - yynsp = yyns; -#endif - - yystate = 0; - yyerrstatus = 0; - yynerrs = 0; - yychar = YYEMPTY; /* Cause a token to be read. */ + parser = PL_parser; + ps = parser->ps; - goto yysetstate; + ENTER; /* force parser free before we return */ + SAVEDESTRUCTOR_X(Perl_parser_free, (void*) parser); /*------------------------------------------------------------. | yynewstate -- Push a new state, which is found in yystate. | `------------------------------------------------------------*/ yynewstate: - /* In all cases, when you get here, the value and location stacks - have just been pushed. so pushing a state here evens the stacks. - */ - yyssp++; - yysetstate: + yystate = ps->state; + YYDPRINTF ((Perl_debug_log, "Entering state %d\n", yystate)); - *yyssp = yystate; - if (yy_type_tab[yystos[yystate]] == toketype_opval && yyvsp->opval) { - yyvsp->opval->op_latefree = 1; - yyvsp->opval->op_latefreed = 0; + if (yy_type_tab[yystos[yystate]] == toketype_opval && ps->val.opval) { + ps->val.opval->op_latefree = 1; + ps->val.opval->op_latefreed = 0; } - ss_save->yyss = yyss; - ss_save->yyssp = yyssp; - ss_save->yyvsp = yyvsp; - ss_save->yypsp = yypsp; - ss_save->yylen = 0; - - if (yyss + yystacksize - 1 <= yyssp) { - /* Get the current used size of the three stacks, in elements. */ - const YYSIZE_T yysize = yyssp - yyss + 1; - - /* Extend the stack our own way. */ - if (YYMAXDEPTH <= yystacksize) - goto yyoverflowlab; - yystacksize *= 2; - if (YYMAXDEPTH < yystacksize) - yystacksize = YYMAXDEPTH; - - SvGROW(yyss_sv, yystacksize * sizeof(short)); - SvGROW(yyvs_sv, yystacksize * sizeof(YYSTYPE)); - SvGROW(yyps_sv, yystacksize * sizeof(AV*)); - yyss = (short *) SvPVX(yyss_sv); - yyvs = (YYSTYPE *) SvPVX(yyvs_sv); - yyps = (AV **) SvPVX(yyps_sv); -#ifdef DEBUGGING - SvGROW(yyns_sv, yystacksize * sizeof(char *)); - /* XXX This seems strange to cast char * to char ** */ - yyns = (const char **) SvPVX(yyns_sv); - if (! yyns) - goto yyoverflowlab; - yynsp = yyns + yysize - 1; -#endif - if (!yyss || ! yyvs || ! yyps) - goto yyoverflowlab; - - yyssp = yyss + yysize - 1; - yyvsp = yyvs + yysize - 1; - yypsp = yyps + yysize - 1; + parser->yylen = 0; + { + size_t size = ps - parser->stack + 1; - YYDPRINTF ((Perl_debug_log, "Stack size increased to %lu\n", - (unsigned long int) yystacksize)); + /* grow the stack? We always leave 1 spare slot, + * in case of a '' -> 'foo' reduction */ - if (yyss + yystacksize - 1 <= yyssp) - YYABORT; + if (size >= parser->stack_size - 1) { + /* this will croak on insufficient memory */ + parser->stack_size *= 2; + Renew(parser->stack, parser->stack_size, yy_stack_frame); + ps = parser->ps = parser->stack + size -1; - ss_save->yyss = yyss; - ss_save->yyssp = yyssp; - ss_save->yyvsp = yyvsp; - ss_save->yypsp = yypsp; - ss_save->yylen = 0; + YYDPRINTF((Perl_debug_log, + "parser stack size increased to %lu frames\n", + (unsigned long int)parser->stack_size)); + } } - goto yybackup; - - /*-----------. - | yybackup. | - `-----------*/ - yybackup: - /* Do appropriate processing given the current state. */ /* Read a lookahead token if we need one and don't already have one. */ -/* yyresume: */ /* First try to decide what to do without reference to lookahead token. */ @@ -581,28 +396,28 @@ Perl_yyparse (pTHX) /* Not known => get a lookahead token if don't already have one. */ /* YYCHAR is either YYEMPTY or YYEOF or a valid lookahead symbol. */ - if (yychar == YYEMPTY) { + if (parser->yychar == YYEMPTY) { YYDPRINTF ((Perl_debug_log, "Reading a token: ")); #ifdef PERL_IN_MADLY_C - yychar = PL_madskills ? madlex() : yylex(); + parser->yychar = PL_madskills ? madlex() : yylex(); #else - yychar = yylex(); + parser->yychar = yylex(); #endif # ifdef EBCDIC - if (yychar >= 0 && yychar < 255) { - yychar = NATIVE_TO_ASCII(yychar); + if (parser->yychar >= 0 && parser->yychar < 255) { + parser->yychar = NATIVE_TO_ASCII(parser->yychar); } # endif } - if (yychar <= YYEOF) { - yychar = yytoken = YYEOF; + if (parser->yychar <= YYEOF) { + parser->yychar = yytoken = YYEOF; YYDPRINTF ((Perl_debug_log, "Now at end of input.\n")); } else { - yytoken = YYTRANSLATE (yychar); - YYDSYMPRINTF ("Next token is", yytoken, &yylval); + yytoken = YYTRANSLATE (parser->yychar); + YYDSYMPRINTF ("Next token is", yytoken, &parser->yylval); } /* If the proper action on seeing token YYTOKEN is to reduce or to @@ -625,22 +440,21 @@ Perl_yyparse (pTHX) YYDPRINTF ((Perl_debug_log, "Shifting token %s, ", yytname[yytoken])); /* Discard the token being shifted unless it is eof. */ - if (yychar != YYEOF) - yychar = YYEMPTY; + if (parser->yychar != YYEOF) + parser->yychar = YYEMPTY; - *++yyvsp = yylval; - *++yypsp = PL_comppad; + YYPUSHSTACK; + ps->state = yyn; + ps->val = parser->yylval; + ps->comppad = PL_comppad; #ifdef DEBUGGING - *++yynsp = (const char *)(yytname[yytoken]); + ps->name = (const char *)(yytname[yytoken]); #endif - /* Count tokens shifted since error; after three, turn off error status. */ - if (yyerrstatus) - yyerrstatus--; - - yystate = yyn; + if (parser->yyerrstatus) + parser->yyerrstatus--; goto yynewstate; @@ -660,7 +474,7 @@ Perl_yyparse (pTHX) `-----------------------------*/ yyreduce: /* yyn is the number of a rule to reduce with. */ - yylen = yyr2[yyn]; + parser->yylen = yyr2[yyn]; /* If YYLEN is nonzero, implement the default value of the action: "$$ = $1". @@ -670,20 +484,11 @@ Perl_yyparse (pTHX) users should not rely upon it. Assigning to YYVAL unconditionally makes the parser a bit smaller, and it avoids a GCC warning that YYVAL may be used uninitialized. */ - yyval = yyvsp[1-yylen]; + yyval = ps[1-parser->yylen].val; - YY_STACK_PRINT (yyss, yyssp, yyvs, yyns); + YY_STACK_PRINT(parser); YY_REDUCE_PRINT (yyn); - /* running external code may trigger a die (eg 'use nosuchmodule'): - * record the current stack state so that an unwind will - * free all the pesky OPs lounging around on the parse stack */ - ss_save->yyss = yyss; - ss_save->yyssp = yyssp; - ss_save->yyvsp = yyvsp; - ss_save->yypsp = yypsp; - ss_save->yylen = yylen; - switch (yyn) { @@ -718,40 +523,38 @@ Perl_yyparse (pTHX) * freed; the rest need the flag resetting */ { int i; - for (i=0; i< yylen; i++) { - if (yy_type_tab[yystos[yyssp[-i]]] == toketype_opval - && yyvsp[-i].opval) + for (i=0; i< parser->yylen; i++) { + if (yy_type_tab[yystos[ps[-i].state]] == toketype_opval + && ps[-i].val.opval) { - yyvsp[-i].opval->op_latefree = 0; - if (yyvsp[-i].opval->op_latefreed) - op_free(yyvsp[-i].opval); + ps[-i].val.opval->op_latefree = 0; + if (ps[-i].val.opval->op_latefreed) + op_free(ps[-i].val.opval); } } } - yyvsp -= yylen; - yyssp -= yylen; - yypsp -= yylen; -#ifdef DEBUGGING - yynsp -= yylen; -#endif + parser->ps = ps -= (parser->yylen-1); - *++yyvsp = yyval; - *++yypsp = PL_comppad; -#ifdef DEBUGGING - *++yynsp = (const char *)(yytname [yyr1[yyn]]); -#endif /* Now shift the result of the reduction. Determine what state that goes to, based on the state we popped back to and the rule number reduced by. */ + ps->val = yyval; + ps->comppad = PL_comppad; +#ifdef DEBUGGING + ps->name = (const char *)(yytname [yyr1[yyn]]); +#endif + yyn = yyr1[yyn]; - yystate = yypgoto[yyn - YYNTOKENS] + *yyssp; - if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == *yyssp) + yystate = yypgoto[yyn - YYNTOKENS] + ps[-1].state; + if (0 <= yystate && yystate <= YYLAST && yycheck[yystate] == ps[-1].state) yystate = yytable[yystate]; else yystate = yydefgoto[yyn - YYNTOKENS]; + ps->state = yystate; + goto yynewstate; @@ -760,86 +563,39 @@ Perl_yyparse (pTHX) `------------------------------------*/ yyerrlab: /* If not already recovering from an error, report this error. */ - if (!yyerrstatus) { - ++yynerrs; -#if YYERROR_VERBOSE - yyn = yypact[yystate]; - - if (YYPACT_NINF < yyn && yyn < YYLAST) { - YYSIZE_T yysize = 0; - const int yytype = YYTRANSLATE (yychar); - char *yymsg; - int yyx, yycount; - - yycount = 0; - /* Start YYX at -YYN if negative to avoid negative indexes in - YYCHECK. */ - for (yyx = yyn < 0 ? -yyn : 0; - yyx < (int) (sizeof (yytname) / sizeof (char *)); yyx++) - if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR) - yysize += yystrlen (yytname[yyx]) + 15, yycount++; - yysize += yystrlen ("syntax error, unexpected ") + 1; - yysize += yystrlen (yytname[yytype]); - Newx(yymsg, yysize, char *); - if (yymsg != 0) { - const char *yyp = yystpcpy (yymsg, "syntax error, unexpected "); - yyp = yystpcpy (yyp, yytname[yytype]); - - if (yycount < 5) { - yycount = 0; - for (yyx = yyn < 0 ? -yyn : 0; - yyx < (int) (sizeof (yytname) / sizeof (char *)); - yyx++) - { - if (yycheck[yyx + yyn] == yyx && yyx != YYTERROR) { - const char *yyq = ! yycount ? - ", expecting " : " or "; - yyp = yystpcpy (yyp, yyq); - yyp = yystpcpy (yyp, yytname[yyx]); - yycount++; - } - } - } - yyerror (yymsg); - YYSTACK_FREE (yymsg); - } - else - yyerror ("syntax error; also virtual memory exhausted"); - } - else -#endif /* YYERROR_VERBOSE */ - yyerror ("syntax error"); + if (!parser->yyerrstatus) { + yyerror ("syntax error"); } - if (yyerrstatus == 3) { + if (parser->yyerrstatus == 3) { /* If just tried and failed to reuse lookahead token after an error, discard it. */ /* Return failure if at end of input. */ - if (yychar == YYEOF) { + if (parser->yychar == YYEOF) { /* Pop the error token. */ YYPOPSTACK; /* Pop the rest of the stack. */ - while (yyss < yyssp) { - YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp); - if (yy_type_tab[yystos[*yyssp]] == toketype_opval - && yyvsp->opval) + while (ps > parser->stack) { + YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val); + if (yy_type_tab[yystos[ps->state]] == toketype_opval + && ps->val.opval) { YYDPRINTF ((Perl_debug_log, "(freeing op)\n")); - if (*yypsp != PL_comppad) { - PAD_RESTORE_LOCAL(*yypsp); + if (ps->comppad != PL_comppad) { + PAD_RESTORE_LOCAL(ps->comppad); } - yyvsp->opval->op_latefree = 0; - op_free(yyvsp->opval); + ps->val.opval->op_latefree = 0; + op_free(ps->val.opval); } YYPOPSTACK; } YYABORT; } - YYDSYMPRINTF ("Error: discarding", yytoken, &yylval); - yychar = YYEMPTY; + YYDSYMPRINTF ("Error: discarding", yytoken, &parser->yylval); + parser->yychar = YYEMPTY; } @@ -852,7 +608,7 @@ Perl_yyparse (pTHX) | yyerrlab1 -- error raised explicitly by an action. | `----------------------------------------------------*/ yyerrlab1: - yyerrstatus = 3; /* Each real token shifted decrements this. */ + parser->yyerrstatus = 3; /* Each real token shifted decrements this. */ for (;;) { yyn = yypact[yystate]; @@ -866,26 +622,22 @@ Perl_yyparse (pTHX) } /* Pop the current state because it cannot handle the error token. */ - if (yyssp == yyss) + if (ps == parser->stack) YYABORT; - YYDSYMPRINTF ("Error: popping", yystos[*yyssp], yyvsp); - if (yy_type_tab[yystos[*yyssp]] == toketype_opval && yyvsp->opval) { + YYDSYMPRINTF ("Error: popping", yystos[ps->state], &ps->val); + if (yy_type_tab[yystos[ps->state]] == toketype_opval && ps->val.opval) { YYDPRINTF ((Perl_debug_log, "(freeing op)\n")); - if (*yypsp != PL_comppad) { - PAD_RESTORE_LOCAL(*yypsp); + if (ps->comppad != PL_comppad) { + PAD_RESTORE_LOCAL(ps->comppad); } - yyvsp->opval->op_latefree = 0; - op_free(yyvsp->opval); + ps->val.opval->op_latefree = 0; + op_free(ps->val.opval); } - yyvsp--; - yypsp--; -#ifdef DEBUGGING - yynsp--; -#endif - yystate = *--yyssp; + YYPOPSTACK; + yystate = ps->state; - YY_STACK_PRINT (yyss, yyssp, yyvs, yyns); + YY_STACK_PRINT(parser); } if (yyn == YYFINAL) @@ -893,14 +645,14 @@ Perl_yyparse (pTHX) YYDPRINTF ((Perl_debug_log, "Shifting error token, ")); - *++yyvsp = yylval; - *++yypsp = PL_comppad; + YYPUSHSTACK; + ps->state = yyn; + ps->val = parser->yylval; + ps->comppad = PL_comppad; #ifdef DEBUGGING - *++yynsp =""; + ps->name =""; #endif - yystate = yyn; - goto yynewstate; @@ -909,6 +661,7 @@ Perl_yyparse (pTHX) `-------------------------------------*/ yyacceptlab: yyresult = 0; + parser->ps = parser->stack; /* disable cleanup */ goto yyreturn; /*-----------------------------------. @@ -918,19 +671,8 @@ Perl_yyparse (pTHX) yyresult = 1; goto yyreturn; - /*----------------------------------------------. - | yyoverflowlab -- parser overflow comes here. | - `----------------------------------------------*/ - yyoverflowlab: - yyerror ("parser stack overflow"); - yyresult = 2; - /* Fall through. */ - yyreturn: - - ss_save->yyss = NULL; /* disarm parse stack cleanup */ - LEAVE; /* force stack free before we return */ - + LEAVE; /* force parser free before we return */ return yyresult; }