X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=pad.c;h=d13cd758e9926c9102ef4f0df7d7ee377b758957;hb=1aa6ea502f811472fe5fb23153ef6b09b3f470ec;hp=590aad8d153f48d091d1cd61d2e3fc779332b50a;hpb=f3548bdc4d2efd11e139d110e60764b9dae81319;p=p5sagit%2Fp5-mst-13.2.git diff --git a/pad.c b/pad.c index 590aad8..d13cd75 100644 --- a/pad.c +++ b/pad.c @@ -1,6 +1,6 @@ /* pad.c * - * Copyright (c) 2002, Larry Wall + * Copyright (C) 2002, 2003, 2004, 2005, 2006, 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. @@ -22,12 +22,18 @@ /* =head1 Pad Data Structures +This file contains the functions that create and manipulate scratchpads, +which are array-of-array data structures attached to a CV (ie a sub) +and which store lexical variables and opcode temporary and per-thread +values. + =for apidoc m|AV *|CvPADLIST|CV *cv CV's can have CvPADLIST(cv) set to point to an AV. For these purposes "forms" are a kind-of CV, eval""s are too (except they're not callable at will and are always thrown away after the eval"" is done -executing). +executing). Require'd files are simply evals without any outer lexical +scope. XSUBs don't have CvPADLIST set - dXSTARG fetches values from PL_curpad, but that is really the callers pad (a slot of which is allocated by @@ -46,9 +52,9 @@ The 0'th slot of a frame AV is an AV which is @_. other entries are storage for variables and op targets. During compilation: -C is set the the the names AV. -C is set the the frame AV for the frame CvDEPTH == 1. -C is set the body of the frame AV (i.e. AvARRAY(PL_comppad)). +C is set to the names AV. +C is set to the frame AV for the frame CvDEPTH == 1. +C is set to the body of the frame AV (i.e. AvARRAY(PL_comppad)). During execution, C and C refer to the live frame of the currently executing sub. @@ -69,18 +75,33 @@ The SVs in the names AV have their PV being the name of the variable. NV+1..IV inclusive is a range of cop_seq numbers for which the name is valid. For typed lexicals name SV is SVt_PVMG and SvSTASH points at the type. For C lexicals, the type is SVt_PVGV, and GvSTASH points at the -stash of the associated global (so that duplicate C delarations in the +stash of the associated global (so that duplicate C declarations in the same package can be detected). SvCUR is sometimes hijacked to store the generation number during compilation. -If SvFAKE is set on the name SV then slot in the frame AVs are -a REFCNT'ed references to a lexical from "outside". +If SvFAKE is set on the name SV, then that slot in the frame AV is +a REFCNT'ed reference to a lexical from "outside". In this case, +the name SV does not use NVX and IVX to store a cop_seq range, since it is +in scope throughout. Instead IVX stores some flags containing info about +the real lexical (is it declared in an anon, and is it capable of being +instantiated multiple times?), and for fake ANONs, NVX contains the index +within the parent's pad where the lexical's value is stored, to make +cloning quicker. -If the 'name' is '&' the the corresponding entry in frame AV +If the 'name' is '&' the corresponding entry in frame AV is a CV representing a possible closure. (SvFAKE and name of '&' is not a meaningful combination currently but could become so if C is implemented.) +Note that formats are treated as anon subs, and are cloned each time +write is called (if necessary). + +The flag SVf_PADSTALE is cleared on lexicals each time the my() is executed, +and set on scope exit. This allows the 'Variable $x is not available' warning +to be generated in evals, such as + + { my $x = 1; sub f { eval '$x'} } f(); + =cut */ @@ -109,9 +130,10 @@ can be OR'ed together: */ PADLIST * -Perl_pad_new(pTHX_ padnew_flags flags) +Perl_pad_new(pTHX_ int flags) { - AV *padlist, *padname, *pad, *a0; + dVAR; + AV *padlist, *padname, *pad; ASSERT_CURPAD_LEGAL("pad_new"); @@ -131,6 +153,7 @@ Perl_pad_new(pTHX_ padnew_flags flags) SAVEI32(PL_comppad_name_fill); SAVEI32(PL_min_intro_pending); SAVEI32(PL_max_intro_pending); + SAVEI32(PL_cv_has_eval); if (flags & padnew_SAVESUB) { SAVEI32(PL_pad_reset_pending); } @@ -151,10 +174,10 @@ Perl_pad_new(pTHX_ padnew_flags flags) * dispensed with eventually ??? */ - a0 = newAV(); /* will be @_ */ + AV * const a0 = newAV(); /* will be @_ */ av_extend(a0, 0); av_store(pad, 0, (SV*)a0); - AvFLAGS(a0) = AVf_REIFY; + AvREIFY_only(a0); } else { av_store(pad, 0, Nullsv); @@ -174,12 +197,13 @@ Perl_pad_new(pTHX_ padnew_flags flags) PL_comppad_name_fill = 0; PL_min_intro_pending = 0; PL_padix = 0; + PL_cv_has_eval = 0; } DEBUG_X(PerlIO_printf(Perl_debug_log, - "Pad 0x%"UVxf"[0x%"UVxf"] new: padlist=0x%"UVxf + "Pad 0x%"UVxf"[0x%"UVxf"] new: compcv=0x%"UVxf " name=0x%"UVxf" flags=0x%"UVxf"\n", - PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(padlist), + PTR2UV(PL_comppad), PTR2UV(PL_curpad), PTR2UV(PL_compcv), PTR2UV(padname), (UV)flags ) ); @@ -194,65 +218,88 @@ Free the padlist associated with a CV. If parts of it happen to be current, we null the relevant PL_*pad* global vars so that we don't have any dangling references left. We also repoint the CvOUTSIDE of any about-to-be-orphaned -inner subs to outercv. +inner subs to the outer of this cv. + +(This function should really be called pad_free, but the name was already +taken) =cut */ void -Perl_pad_undef(pTHX_ CV* cv, CV* outercv) +Perl_pad_undef(pTHX_ CV* cv) { + dVAR; I32 ix; - PADLIST *padlist = CvPADLIST(cv); + const PADLIST * const padlist = CvPADLIST(cv); if (!padlist) return; - if (!SvREFCNT(CvPADLIST(cv))) /* may be during global destruction */ + if (SvIS_FREED(padlist)) /* may be during global destruction */ return; DEBUG_X(PerlIO_printf(Perl_debug_log, - "Pad undef: padlist=0x%"UVxf"\n" , PTR2UV(padlist)) + "Pad undef: cv=0x%"UVxf" padlist=0x%"UVxf"\n", + PTR2UV(cv), PTR2UV(padlist)) ); - /* pads may be cleared out already during global destruction */ - if ((CvEVAL(cv) && !CvGV(cv) /* is this eval"" ? */ - && !PL_dirty) || CvSPECIAL(cv)) - { - /* XXX DAPM the following code is very similar to - * pad_fixup_inner_anons(). Merge??? */ - - /* inner references to eval's cv must be fixed up */ - AV *comppad_name = (AV*)AvARRAY(padlist)[0]; - SV **namepad = AvARRAY(comppad_name); - AV *comppad = (AV*)AvARRAY(padlist)[1]; - SV **curpad = AvARRAY(comppad); + /* detach any '&' anon children in the pad; if afterwards they + * are still live, fix up their CvOUTSIDEs to point to our outside, + * bypassing us. */ + /* XXX DAPM for efficiency, we should only do this if we know we have + * children, or integrate this loop with general cleanup */ + + if (!PL_dirty) { /* don't bother during global destruction */ + CV * const outercv = CvOUTSIDE(cv); + const U32 seq = CvOUTSIDE_SEQ(cv); + AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; + SV ** const namepad = AvARRAY(comppad_name); + AV * const comppad = (AV*)AvARRAY(padlist)[1]; + SV ** const curpad = AvARRAY(comppad); for (ix = AvFILLp(comppad_name); ix > 0; ix--) { - SV *namesv = namepad[ix]; + SV * const namesv = namepad[ix]; if (namesv && namesv != &PL_sv_undef - && *SvPVX(namesv) == '&' - && ix <= AvFILLp(comppad)) + && *SvPVX_const(namesv) == '&') { - CV *innercv = (CV*)curpad[ix]; - if (innercv && SvTYPE(innercv) == SVt_PVCV + CV * const innercv = (CV*)curpad[ix]; + U32 inner_rc = SvREFCNT(innercv); + assert(inner_rc); + namepad[ix] = Nullsv; + SvREFCNT_dec(namesv); + + if (SvREFCNT(comppad) < 2) { /* allow for /(?{ sub{} })/ */ + curpad[ix] = Nullsv; + SvREFCNT_dec(innercv); + inner_rc--; + } + if (inner_rc /* in use, not just a prototype */ && CvOUTSIDE(innercv) == cv) { - CvOUTSIDE(innercv) = outercv; - if (!CvANON(innercv) || CvCLONED(innercv)) { + assert(CvWEAKOUTSIDE(innercv)); + /* don't relink to grandfather if he's being freed */ + if (outercv && SvREFCNT(outercv)) { + CvWEAKOUTSIDE_off(innercv); + CvOUTSIDE(innercv) = outercv; + CvOUTSIDE_SEQ(innercv) = seq; (void)SvREFCNT_inc(outercv); - if (SvREFCNT(cv)) - SvREFCNT_dec(cv); } + else { + CvOUTSIDE(innercv) = Nullcv; + } + } + } } } + ix = AvFILLp(padlist); while (ix >= 0) { - SV* sv = AvARRAY(padlist)[ix--]; + SV* const sv = AvARRAY(padlist)[ix--]; if (!sv) continue; if (sv == (SV*)PL_comppad_name) - PL_comppad_name = Nullav; + PL_comppad_name = NULL; else if (sv == (SV*)PL_comppad) { PL_comppad = Null(PAD*); PL_curpad = Null(SV**); @@ -269,73 +316,56 @@ Perl_pad_undef(pTHX_ CV* cv, CV* outercv) /* =for apidoc pad_add_name -Create a new name in the current pad at the specified offset. +Create a new name and associated PADMY SV in the current pad; return the +offset. If C is valid, the name is for a typed lexical; set the name's stash to that value. If C is valid, it's an our lexical, set the name's GvSTASH to that value -Also, if the name is @.. or %.., create a new array or hash for that slot - If fake, it means we're cloning an existing entry =cut */ -/* - * XXX DAPM this doesn't seem the right place to create a new array/hash. - * Whatever we do, we should be consistent - create scalars too, and - * create even if fake. Really need to integrate better the whole entry - * creation business - when + where does the name and value get created? - */ - PADOFFSET -Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) +Perl_pad_add_name(pTHX_ const char *name, HV* typestash, HV* ourstash, bool fake) { - PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); - SV* namesv = NEWSV(1102, 0); - U32 min, max; + dVAR; + const PADOFFSET offset = pad_alloc(OP_PADSV, SVs_PADMY); + SV* const namesv = NEWSV(1102, 0); ASSERT_CURPAD_ACTIVE("pad_add_name"); - if (fake) { - min = PL_curcop->cop_seq; - max = PAD_MAX; - } - else { - /* not yet introduced */ - min = PAD_MAX; - max = 0; - } - - DEBUG_Xv(PerlIO_printf(Perl_debug_log, - "Pad addname: %ld \"%s\", (%lu,%lu)%s\n", - (long)offset, name, (unsigned long)min, (unsigned long)max, - (fake ? " FAKE" : "") - ) - ); sv_upgrade(namesv, ourstash ? SVt_PVGV : typestash ? SVt_PVMG : SVt_PVNV); sv_setpv(namesv, name); if (typestash) { SvFLAGS(namesv) |= SVpad_TYPED; - SvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) typestash); + SvSTASH_set(namesv, (HV*)SvREFCNT_inc((SV*) typestash)); } if (ourstash) { SvFLAGS(namesv) |= SVpad_OUR; - GvSTASH(namesv) = (HV*)SvREFCNT_inc((SV*) ourstash); + GvSTASH(namesv) = ourstash; + Perl_sv_add_backref(aTHX_ (SV*)ourstash, namesv); } av_store(PL_comppad_name, offset, namesv); - SvNVX(namesv) = (NV)min; - SvIVX(namesv) = max; - if (fake) + if (fake) { SvFAKE_on(namesv); + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad addname: %ld \"%s\" FAKE\n", (long)offset, name)); + } else { + /* not yet introduced */ + SvNV_set(namesv, (NV)PAD_MAX); /* min */ + SvIV_set(namesv, 0); /* max */ + if (!PL_min_intro_pending) PL_min_intro_pending = offset; PL_max_intro_pending = offset; + /* if it's not a simple scalar, replace with an AV or HV */ /* XXX DAPM since slot has been allocated, replace * av_store with PL_curpad[offset] ? */ if (*name == '@') @@ -343,6 +373,9 @@ Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) else if (*name == '%') av_store(PL_comppad, offset, (SV*)newHV()); SvPADMY_on(PL_curpad[offset]); + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad addname: %ld \"%s\" new lex=0x%"UVxf"\n", + (long)offset, name, PTR2UV(PL_curpad[offset]))); } return offset; @@ -356,18 +389,25 @@ Perl_pad_add_name(pTHX_ char *name, HV* typestash, HV* ourstash, bool fake) Allocate a new my or tmp pad entry. For a my, simply push a null SV onto the end of PL_comppad, but for a tmp, scan the pad from PL_padix upwards -for a slot which has no name and and no active value. +for a slot which has no name and no active value. =cut */ /* XXX DAPM integrate alloc(), add_name() and add_anon(), * or at least rationalise ??? */ - +/* And flag whether the incoming name is UTF8 or 8 bit? + Could do this either with the +ve/-ve hack of the HV code, or expanding + the flag bits. Either way, this makes proper Unicode safe pad support. + Also could change the sv structure to make the NV a union with 2 U32s, + so that SvCUR() could stop being overloaded in pad SVs. + NWC +*/ PADOFFSET Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) { + dVAR; SV *sv; I32 retval; @@ -378,14 +418,12 @@ Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) if (PL_pad_reset_pending) pad_reset(); if (tmptype & SVs_PADMY) { - do { - sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); - } while (SvPADBUSY(sv)); /* need a fresh one */ + sv = *av_fetch(PL_comppad, AvFILLp(PL_comppad) + 1, TRUE); retval = AvFILLp(PL_comppad); } else { - SV **names = AvARRAY(PL_comppad_name); - SSize_t names_fill = AvFILLp(PL_comppad_name); + SV * const * const names = AvARRAY(PL_comppad_name); + const SSize_t names_fill = AvFILLp(PL_comppad_name); for (;;) { /* * "foreach" index vars temporarily become aliases to non-"my" @@ -410,6 +448,10 @@ Perl_pad_alloc(pTHX_ I32 optype, U32 tmptype) "Pad 0x%"UVxf"[0x%"UVxf"] alloc: %ld for %s\n", PTR2UV(PL_comppad), PTR2UV(PL_curpad), (long) retval, PL_op_name[optype])); +#ifdef DEBUG_LEAKING_SCALARS + sv->sv_debug_optype = optype; + sv->sv_debug_inpad = 1; +#endif return (PADOFFSET)retval; } @@ -424,19 +466,26 @@ Add an anon code entry to the current compiling pad PADOFFSET Perl_pad_add_anon(pTHX_ SV* sv, OPCODE op_type) { + dVAR; PADOFFSET ix; - SV* name; - - name = NEWSV(1106, 0); + SV* const name = NEWSV(1106, 0); sv_upgrade(name, SVt_PVNV); sv_setpvn(name, "&", 1); - SvIVX(name) = -1; - SvNVX(name) = 1; + SvIV_set(name, -1); + SvNV_set(name, 1); ix = pad_alloc(op_type, SVs_PADMY); av_store(PL_comppad_name, ix, name); /* XXX DAPM use PL_curpad[] ? */ av_store(PL_comppad, ix, sv); SvPADMY_on(sv); + + /* to avoid ref loops, we never have parent + child referencing each + * other simultaneously */ + if (CvOUTSIDE((CV*)sv)) { + assert(!CvWEAKOUTSIDE((CV*)sv)); + CvWEAKOUTSIDE_on((CV*)sv); + SvREFCNT_dec(CvOUTSIDE((CV*)sv)); + } return ix; } @@ -457,13 +506,14 @@ C indicates that the name to check is an 'our' declaration /* XXX DAPM integrate this into pad_add_name ??? */ void -Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) +Perl_pad_check_dup(pTHX_ const char *name, bool is_our, const HV *ourstash) { - SV **svp, *sv; + dVAR; + SV **svp; PADOFFSET top, off; ASSERT_CURPAD_ACTIVE("pad_check_dup"); - if (!ckWARN(WARN_MISC) || AvFILLp(PL_comppad_name) < 0) + if (AvFILLp(PL_comppad_name) < 0 || !ckWARN(WARN_MISC)) return; /* nothing to check */ svp = AvARRAY(PL_comppad_name); @@ -472,13 +522,15 @@ Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) /* XXX DAPM - why the (I32) cast - shouldn't we ensure they're the same * type ? */ for (off = top; (I32)off > PL_comppad_name_floor; off--) { - if ((sv = svp[off]) + SV * const sv = svp[off]; + if (sv && sv != &PL_sv_undef + && !SvFAKE(sv) && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) - && (!is_our - || ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash)) - && strEQ(name, SvPVX(sv))) + && strEQ(name, SvPVX_const(sv))) { + if (is_our && (SvFLAGS(sv) & SVpad_OUR)) + break; /* "our" masking "our" */ Perl_warner(aTHX_ packWARN(WARN_MISC), "\"%s\" variable %s masks earlier declaration in same %s", (is_our ? "our" : "my"), @@ -491,16 +543,19 @@ Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) /* check the rest of the pad */ if (is_our) { do { - if ((sv = svp[off]) + SV * const sv = svp[off]; + if (sv && sv != &PL_sv_undef + && !SvFAKE(sv) && (SvIVX(sv) == PAD_MAX || SvIVX(sv) == 0) && ((SvFLAGS(sv) & SVpad_OUR) && GvSTASH(sv) == ourstash) - && strEQ(name, SvPVX(sv))) + && strEQ(name, SvPVX_const(sv))) { Perl_warner(aTHX_ packWARN(WARN_MISC), "\"our\" variable %s redeclared", name); - Perl_warner(aTHX_ packWARN(WARN_MISC), - "\t(Did you mean \"local\" instead of \"our\"?)\n"); + if ((I32)off <= PL_comppad_name_floor) + Perl_warner(aTHX_ packWARN(WARN_MISC), + "\t(Did you mean \"local\" instead of \"our\"?)\n"); break; } } while ( off-- > 0 ); @@ -508,7 +563,6 @@ Perl_pad_check_dup(pTHX_ char *name, bool is_our, HV *ourstash) } - /* =for apidoc pad_findmy @@ -522,276 +576,303 @@ Returns the offset in the current pad, or NOT_IN_PAD on failure. */ PADOFFSET -Perl_pad_findmy(pTHX_ char *name) +Perl_pad_findmy(pTHX_ const char *name) { - I32 off; - I32 pendoff = 0; - SV *sv; - SV **svp = AvARRAY(PL_comppad_name); - U32 seq = PL_cop_seqmax; - PERL_CONTEXT *cx; - CV *outside; - - ASSERT_CURPAD_ACTIVE("pad_findmy"); - DEBUG_Xv(PerlIO_printf(Perl_debug_log, "Pad findmy: \"%s\"\n", name)); - - /* The one we're looking for is probably just before comppad_name_fill. */ - for (off = AvFILLp(PL_comppad_name); off > 0; off--) { - if ((sv = svp[off]) && - sv != &PL_sv_undef && - (!SvIVX(sv) || - (seq <= (U32)SvIVX(sv) && - seq > (U32)I_32(SvNVX(sv)))) && - strEQ(SvPVX(sv), name)) - { - if (SvIVX(sv) || SvFLAGS(sv) & SVpad_OUR) - return (PADOFFSET)off; - pendoff = off; /* this pending def. will override import */ - } - } - - outside = CvOUTSIDE(PL_compcv); - - /* Check if if we're compiling an eval'', and adjust seq to be the - * eval's seq number. This depends on eval'' having a non-null - * CvOUTSIDE() while it is being compiled. The eval'' itself is - * identified by CvEVAL being true and CvGV being null. */ - if (outside && CvEVAL(PL_compcv) && !CvGV(PL_compcv) && cxstack_ix >= 0) { - cx = &cxstack[cxstack_ix]; - if (CxREALEVAL(cx)) - seq = cx->blk_oldcop->cop_seq; + dVAR; + SV *out_sv; + int out_flags; + I32 offset; + const AV *nameav; + SV **name_svp; + + offset = pad_findlex(name, PL_compcv, PL_cop_seqmax, 1, + Null(SV**), &out_sv, &out_flags); + if (offset != NOT_IN_PAD) + return offset; + + /* look for an our that's being introduced; this allows + * our $foo = 0 unless defined $foo; + * to not give a warning. (Yes, this is a hack) */ + + nameav = (AV*)AvARRAY(CvPADLIST(PL_compcv))[0]; + name_svp = AvARRAY(nameav); + for (offset = AvFILLp(nameav); offset > 0; offset--) { + const SV * const namesv = name_svp[offset]; + if (namesv && namesv != &PL_sv_undef + && !SvFAKE(namesv) + && (SvFLAGS(namesv) & SVpad_OUR) + && strEQ(SvPVX_const(namesv), name) + && U_32(SvNVX(namesv)) == PAD_MAX /* min */ + ) + return offset; } - - /* See if it's in a nested scope */ - off = pad_findlex(name, 0, seq, outside, cxstack_ix, 0, 0); - if (!off) /* pad_findlex returns 0 for failure...*/ - return NOT_IN_PAD; /* ...but we return NOT_IN_PAD for failure */ - - /* If there is a pending local definition, this new alias must die */ - if (pendoff) - SvIVX(AvARRAY(PL_comppad_name)[off]) = seq; - return off; + return NOT_IN_PAD; } +/* + * Returns the offset of a lexical $_, if there is one, at run time. + * Used by the UNDERBAR XS macro. + */ +PADOFFSET +Perl_find_rundefsvoffset(pTHX) +{ + dVAR; + SV *out_sv; + int out_flags; + return pad_findlex("$_", find_runcv(NULL), PL_curcop->cop_seq, 1, + Null(SV**), &out_sv, &out_flags); +} /* =for apidoc pad_findlex Find a named lexical anywhere in a chain of nested pads. Add fake entries -in the inner pads if its found in an outer one. - -If flags == FINDLEX_NOSEARCH we don't bother searching outer contexts. +in the inner pads if it's found in an outer one. + +Returns the offset in the bottom pad of the lex or the fake lex. +cv is the CV in which to start the search, and seq is the current cop_seq +to match against. If warn is true, print appropriate warnings. The out_* +vars return values, and so are pointers to where the returned values +should be stored. out_capture, if non-null, requests that the innermost +instance of the lexical is captured; out_name_sv is set to the innermost +matched namesv or fake namesv; out_flags returns the flags normally +associated with the IVX field of a fake namesv. + +Note that pad_findlex() is recursive; it recurses up the chain of CVs, +then comes back down, adding fake entries as it goes. It has to be this way +because fake namesvs in anon protoypes have to store in NVX the index into +the parent pad. =cut */ -#define FINDLEX_NOSEARCH 1 /* don't search outer contexts */ +/* Flags set in the SvIVX field of FAKE namesvs */ + +#define PAD_FAKELEX_ANON 1 /* the lex is declared in an ANON, or ... */ +#define PAD_FAKELEX_MULTI 2 /* the lex can be instantiated multiple times */ + +/* the CV has finished being compiled. This is not a sufficient test for + * all CVs (eg XSUBs), but suffices for the CVs found in a lexical chain */ +#define CvCOMPILED(cv) CvROOT(cv) + +/* the CV does late binding of its lexicals */ +#define CvLATE(cv) (CvANON(cv) || SvTYPE(cv) == SVt_PVFM) + STATIC PADOFFSET -S_pad_findlex(pTHX_ char *name, PADOFFSET newoff, U32 seq, CV* startcv, - I32 cx_ix, I32 saweval, U32 flags) +S_pad_findlex(pTHX_ const char *name, const CV* cv, U32 seq, int warn, + SV** out_capture, SV** out_name_sv, int *out_flags) { - CV *cv; - I32 off; - SV *sv; - register I32 i; - register PERL_CONTEXT *cx; + dVAR; + I32 offset, new_offset; + SV *new_capture; + SV **new_capturep; + const AV * const padlist = CvPADLIST(cv); + + *out_flags = 0; - ASSERT_CURPAD_ACTIVE("pad_findlex"); DEBUG_Xv(PerlIO_printf(Perl_debug_log, - "Pad findlex: \"%s\" off=%ld seq=%lu cv=0x%"UVxf - " ix=%ld saweval=%d flags=%lu\n", - name, (long)newoff, (unsigned long)seq, PTR2UV(startcv), - (long)cx_ix, (int)saweval, (unsigned long)flags - ) - ); + "Pad findlex cv=0x%"UVxf" searching \"%s\" seq=%d%s\n", + PTR2UV(cv), name, (int)seq, out_capture ? " capturing" : "" )); - for (cv = startcv; cv; cv = CvOUTSIDE(cv)) { - AV *curlist = CvPADLIST(cv); - SV **svp = av_fetch(curlist, 0, FALSE); - AV *curname; + /* first, search this pad */ - DEBUG_Xv(PerlIO_printf(Perl_debug_log, - " searching: cv=0x%"UVxf"\n", PTR2UV(cv)) - ); + if (padlist) { /* not an undef CV */ + I32 fake_offset = 0; + const AV * const nameav = (AV*)AvARRAY(padlist)[0]; + SV * const * const name_svp = AvARRAY(nameav); - if (!svp || *svp == &PL_sv_undef) - continue; - curname = (AV*)*svp; - svp = AvARRAY(curname); - for (off = AvFILLp(curname); off > 0; off--) { - I32 depth; - AV *oldpad; - SV *oldsv; - - if ( ! ( - (sv = svp[off]) && - sv != &PL_sv_undef && - seq <= (U32)SvIVX(sv) && - seq > (U32)I_32(SvNVX(sv)) && - strEQ(SvPVX(sv), name)) - ) - continue; + for (offset = AvFILLp(nameav); offset > 0; offset--) { + const SV * const namesv = name_svp[offset]; + if (namesv && namesv != &PL_sv_undef + && strEQ(SvPVX_const(namesv), name)) + { + if (SvFAKE(namesv)) + fake_offset = offset; /* in case we don't find a real one */ + else if ( seq > U_32(SvNVX(namesv)) /* min */ + && seq <= (U32)SvIVX(namesv)) /* max */ + break; + } + } - depth = CvDEPTH(cv); - if (!depth) { - if (newoff) { - if (SvFAKE(sv)) - continue; - return 0; /* don't clone from inactive stack frame */ - } - depth = 1; + if (offset > 0 || fake_offset > 0 ) { /* a match! */ + if (offset > 0) { /* not fake */ + fake_offset = 0; + *out_name_sv = name_svp[offset]; /* return the namesv */ + + /* set PAD_FAKELEX_MULTI if this lex can have multiple + * instances. For now, we just test !CvUNIQUE(cv), but + * ideally, we should detect my's declared within loops + * etc - this would allow a wider range of 'not stayed + * shared' warnings. We also treated alreadly-compiled + * lexes as not multi as viewed from evals. */ + + *out_flags = CvANON(cv) ? + PAD_FAKELEX_ANON : + (!CvUNIQUE(cv) && ! CvCOMPILED(cv)) + ? PAD_FAKELEX_MULTI : 0; + + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad findlex cv=0x%"UVxf" matched: offset=%ld (%ld,%ld)\n", + PTR2UV(cv), (long)offset, (long)U_32(SvNVX(*out_name_sv)), + (long)SvIVX(*out_name_sv))); + } + else { /* fake match */ + offset = fake_offset; + *out_name_sv = name_svp[offset]; /* return the namesv */ + *out_flags = SvIVX(*out_name_sv); + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad findlex cv=0x%"UVxf" matched: offset=%ld flags=0x%lx index=%lu\n", + PTR2UV(cv), (long)offset, (unsigned long)*out_flags, + (unsigned long)SvNVX(*out_name_sv) + )); } - oldpad = (AV*)AvARRAY(curlist)[depth]; - oldsv = *av_fetch(oldpad, off, TRUE); + /* return the lex? */ - DEBUG_Xv(PerlIO_printf(Perl_debug_log, - " matched: offset %ld" - " %s(%lu,%lu), sv=0x%"UVxf"\n", - (long)off, - SvFAKE(sv) ? "FAKE " : "", - (unsigned long)I_32(SvNVX(sv)), - (unsigned long)SvIVX(sv), - PTR2UV(oldsv) - ) - ); + if (out_capture) { - if (!newoff) { /* Not a mere clone operation. */ - newoff = pad_add_name( - SvPVX(sv), - (SvFLAGS(sv) & SVpad_TYPED) ? SvSTASH(sv) : Nullhv, - (SvFLAGS(sv) & SVpad_OUR) ? GvSTASH(sv) : Nullhv, - 1 /* fake */ - ); + /* our ? */ + if ((SvFLAGS(*out_name_sv) & SVpad_OUR)) { + *out_capture = Nullsv; + return offset; + } - if (CvANON(PL_compcv) || SvTYPE(PL_compcv) == SVt_PVFM) { - /* "It's closures all the way down." */ - CvCLONE_on(PL_compcv); - if (cv == startcv) { - if (CvANON(PL_compcv)) - oldsv = Nullsv; /* no need to keep ref */ - } - else { - CV *bcv; - for (bcv = startcv; - bcv && bcv != cv && !CvCLONE(bcv); - bcv = CvOUTSIDE(bcv)) - { - if (CvANON(bcv)) { - /* install the missing pad entry in intervening - * nested subs and mark them cloneable. */ - AV *ocomppad_name = PL_comppad_name; - PAD *ocomppad = PL_comppad; - AV *padlist = CvPADLIST(bcv); - PL_comppad_name = (AV*)AvARRAY(padlist)[0]; - PL_comppad = (AV*)AvARRAY(padlist)[1]; - PL_curpad = AvARRAY(PL_comppad); - pad_add_name( - SvPVX(sv), - (SvFLAGS(sv) & SVpad_TYPED) - ? SvSTASH(sv) : Nullhv, - (SvFLAGS(sv) & SVpad_OUR) - ? GvSTASH(sv) : Nullhv, - 1 /* fake */ - ); - - PL_comppad_name = ocomppad_name; - PL_comppad = ocomppad; - PL_curpad = ocomppad ? - AvARRAY(ocomppad) : Null(SV **); - CvCLONE_on(bcv); - } - else { - if (ckWARN(WARN_CLOSURE) - && !CvUNIQUE(bcv) && !CvUNIQUE(cv)) - { - Perl_warner(aTHX_ packWARN(WARN_CLOSURE), - "Variable \"%s\" may be unavailable", - name); - } - break; - } - } - } + /* trying to capture from an anon prototype? */ + if (CvCOMPILED(cv) + ? CvANON(cv) && CvCLONE(cv) && !CvCLONED(cv) + : *out_flags & PAD_FAKELEX_ANON) + { + if (warn && ckWARN(WARN_CLOSURE)) + Perl_warner(aTHX_ packWARN(WARN_CLOSURE), + "Variable \"%s\" is not available", name); + *out_capture = Nullsv; } - else if (!CvUNIQUE(PL_compcv)) { - if (ckWARN(WARN_CLOSURE) && !SvFAKE(sv) && !CvUNIQUE(cv) - && !(SvFLAGS(sv) & SVpad_OUR)) - { + + /* real value */ + else { + int newwarn = warn; + if (!CvCOMPILED(cv) && (*out_flags & PAD_FAKELEX_MULTI) + && warn && ckWARN(WARN_CLOSURE)) { + newwarn = 0; Perl_warner(aTHX_ packWARN(WARN_CLOSURE), "Variable \"%s\" will not stay shared", name); } + + if (fake_offset && CvANON(cv) + && CvCLONE(cv) &&!CvCLONED(cv)) + { + SV *n; + /* not yet caught - look further up */ + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad findlex cv=0x%"UVxf" chasing lex in outer pad\n", + PTR2UV(cv))); + n = *out_name_sv; + (void) pad_findlex(name, CvOUTSIDE(cv), + CvOUTSIDE_SEQ(cv), + newwarn, out_capture, out_name_sv, out_flags); + *out_name_sv = n; + return offset; + } + + *out_capture = AvARRAY((AV*)AvARRAY(padlist)[ + CvDEPTH(cv) ? CvDEPTH(cv) : 1])[offset]; + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad findlex cv=0x%"UVxf" found lex=0x%"UVxf"\n", + PTR2UV(cv), PTR2UV(*out_capture))); + + if (SvPADSTALE(*out_capture)) { + if (ckWARN(WARN_CLOSURE)) + Perl_warner(aTHX_ packWARN(WARN_CLOSURE), + "Variable \"%s\" is not available", name); + *out_capture = Nullsv; + } + } + if (!*out_capture) { + if (*name == '@') + *out_capture = sv_2mortal((SV*)newAV()); + else if (*name == '%') + *out_capture = sv_2mortal((SV*)newHV()); + else + *out_capture = sv_newmortal(); } } - av_store(PL_comppad, newoff, SvREFCNT_inc(oldsv)); - ASSERT_CURPAD_ACTIVE("pad_findlex 2"); - DEBUG_Xv(PerlIO_printf(Perl_debug_log, - "Pad findlex: set offset %ld to sv 0x%"UVxf"\n", - (long)newoff, PTR2UV(oldsv) - ) - ); - return newoff; + + return offset; } } - if (flags & FINDLEX_NOSEARCH) - return 0; + /* it's not in this pad - try above */ - /* Nothing in current lexical context--try eval's context, if any. - * This is necessary to let the perldb get at lexically scoped variables. - * XXX This will also probably interact badly with eval tree caching. - */ + if (!CvOUTSIDE(cv)) + return NOT_IN_PAD; + + /* out_capture non-null means caller wants us to capture lex; in + * addition we capture ourselves unless it's an ANON/format */ + new_capturep = out_capture ? out_capture : + CvLATE(cv) ? Null(SV**) : &new_capture; - for (i = cx_ix; i >= 0; i--) { - cx = &cxstack[i]; - switch (CxTYPE(cx)) { - default: - if (i == 0 && saweval) { - return pad_findlex(name, newoff, seq, PL_main_cv, -1, saweval, 0); - } - break; - case CXt_EVAL: - switch (cx->blk_eval.old_op_type) { - case OP_ENTEREVAL: - if (CxREALEVAL(cx)) { - PADOFFSET off; - saweval = i; - seq = cxstack[i].blk_oldcop->cop_seq; - startcv = cxstack[i].blk_eval.cv; - if (startcv && CvOUTSIDE(startcv)) { - off = pad_findlex(name, newoff, seq, CvOUTSIDE(startcv), - i - 1, saweval, 0); - if (off) /* continue looking if not found here */ - return off; - } - } - break; - case OP_DOFILE: - case OP_REQUIRE: - /* require/do must have their own scope */ - return 0; - } - break; - case CXt_FORMAT: - case CXt_SUB: - if (!saweval) - return 0; - cv = cx->blk_sub.cv; - if (PL_debstash && CvSTASH(cv) == PL_debstash) { /* ignore DB'* scope */ - saweval = i; /* so we know where we were called from */ - seq = cxstack[i].blk_oldcop->cop_seq; - continue; - } - return pad_findlex(name, newoff, seq, cv, i - 1, saweval, FINDLEX_NOSEARCH); + offset = pad_findlex(name, CvOUTSIDE(cv), CvOUTSIDE_SEQ(cv), 1, + new_capturep, out_name_sv, out_flags); + if (offset == NOT_IN_PAD) + return NOT_IN_PAD; + + /* found in an outer CV. Add appropriate fake entry to this pad */ + + /* don't add new fake entries (via eval) to CVs that we have already + * finished compiling, or to undef CVs */ + if (CvCOMPILED(cv) || !padlist) + return 0; /* this dummy (and invalid) value isnt used by the caller */ + + { + SV *new_namesv; + AV * const ocomppad_name = PL_comppad_name; + PAD * const ocomppad = PL_comppad; + PL_comppad_name = (AV*)AvARRAY(padlist)[0]; + PL_comppad = (AV*)AvARRAY(padlist)[1]; + PL_curpad = AvARRAY(PL_comppad); + + new_offset = pad_add_name( + SvPVX_const(*out_name_sv), + (SvFLAGS(*out_name_sv) & SVpad_TYPED) + ? SvSTASH(*out_name_sv) : NULL, + (SvFLAGS(*out_name_sv) & SVpad_OUR) + ? GvSTASH(*out_name_sv) : NULL, + 1 /* fake */ + ); + + new_namesv = AvARRAY(PL_comppad_name)[new_offset]; + SvIV_set(new_namesv, *out_flags); + + SvNV_set(new_namesv, (NV)0); + if (SvFLAGS(new_namesv) & SVpad_OUR) { + /* do nothing */ } - } + else if (CvLATE(cv)) { + /* delayed creation - just note the offset within parent pad */ + SvNV_set(new_namesv, (NV)offset); + CvCLONE_on(cv); + } + else { + /* immediate creation - capture outer value right now */ + av_store(PL_comppad, new_offset, SvREFCNT_inc(*new_capturep)); + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad findlex cv=0x%"UVxf" saved captured sv 0x%"UVxf" at offset %ld\n", + PTR2UV(cv), PTR2UV(*new_capturep), (long)new_offset)); + } + *out_name_sv = new_namesv; + *out_flags = SvIVX(new_namesv); - return 0; + PL_comppad_name = ocomppad_name; + PL_comppad = ocomppad; + PL_curpad = ocomppad ? AvARRAY(ocomppad) : Null(SV **); + } + return new_offset; } +#ifdef DEBUGGING /* =for apidoc pad_sv @@ -805,6 +886,7 @@ Use macro PAD_SV instead of calling this function directly. SV * Perl_pad_sv(pTHX_ PADOFFSET po) { + dVAR; ASSERT_CURPAD_ACTIVE("pad_sv"); if (!po) @@ -826,10 +908,10 @@ Use the macro PAD_SETSV() rather than calling this function directly. =cut */ -#ifdef DEBUGGING void Perl_pad_setsv(pTHX_ PADOFFSET po, SV* sv) { + dVAR; ASSERT_CURPAD_ACTIVE("pad_setsv"); DEBUG_X(PerlIO_printf(Perl_debug_log, @@ -859,6 +941,7 @@ Update the pad compilation state variables on entry to a new block void Perl_pad_block_start(pTHX_ int full) { + dVAR; ASSERT_CURPAD_ACTIVE("pad_block_start"); SAVEI32(PL_comppad_name_floor); PL_comppad_name_floor = AvFILLp(PL_comppad_name); @@ -887,8 +970,8 @@ Perl_pad_block_start(pTHX_ int full) U32 Perl_intro_my(pTHX) { + dVAR; SV **svp; - SV *sv; I32 i; ASSERT_CURPAD_ACTIVE("intro_my"); @@ -897,13 +980,15 @@ Perl_intro_my(pTHX) svp = AvARRAY(PL_comppad_name); for (i = PL_min_intro_pending; i <= PL_max_intro_pending; i++) { - if ((sv = svp[i]) && sv != &PL_sv_undef && !SvIVX(sv)) { - SvIVX(sv) = PAD_MAX; /* Don't know scope end yet. */ - SvNVX(sv) = (NV)PL_cop_seqmax; + SV * const sv = svp[i]; + + if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && !SvIVX(sv)) { + SvIV_set(sv, PAD_MAX); /* Don't know scope end yet. */ + SvNV_set(sv, (NV)PL_cop_seqmax); DEBUG_Xv(PerlIO_printf(Perl_debug_log, - "Pad intromy: %ld \"%s\", (%lu,%lu)\n", - (long)i, SvPVX(sv), - (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) + "Pad intromy: %ld \"%s\", (%ld,%ld)\n", + (long)i, SvPVX_const(sv), + (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) ); } } @@ -927,28 +1012,31 @@ lexicals in this scope and warn of any lexicals that never got introduced. void Perl_pad_leavemy(pTHX) { + dVAR; I32 off; - SV **svp = AvARRAY(PL_comppad_name); - SV *sv; + SV * const * const svp = AvARRAY(PL_comppad_name); PL_pad_reset_pending = FALSE; ASSERT_CURPAD_ACTIVE("pad_leavemy"); if (PL_min_intro_pending && PL_comppad_name_fill < PL_min_intro_pending) { for (off = PL_max_intro_pending; off >= PL_min_intro_pending; off--) { - if ((sv = svp[off]) && sv != &PL_sv_undef && ckWARN_d(WARN_INTERNAL)) + const SV * const sv = svp[off]; + if (sv && sv != &PL_sv_undef + && !SvFAKE(sv) && ckWARN_d(WARN_INTERNAL)) Perl_warner(aTHX_ packWARN(WARN_INTERNAL), - "%s never introduced", SvPVX(sv)); + "%"SVf" never introduced", sv); } } /* "Deintroduce" my variables that are leaving with this scope. */ for (off = AvFILLp(PL_comppad_name); off > PL_comppad_name_fill; off--) { - if ((sv = svp[off]) && sv != &PL_sv_undef && SvIVX(sv) == PAD_MAX) { - SvIVX(sv) = PL_cop_seqmax; + const SV * const sv = svp[off]; + if (sv && sv != &PL_sv_undef && !SvFAKE(sv) && SvIVX(sv) == PAD_MAX) { + SvIV_set(sv, PL_cop_seqmax); DEBUG_Xv(PerlIO_printf(Perl_debug_log, - "Pad leavemy: %ld \"%s\", (%lu,%lu)\n", - (long)off, SvPVX(sv), - (unsigned long)I_32(SvNVX(sv)), (unsigned long)SvIVX(sv)) + "Pad leavemy: %ld \"%s\", (%ld,%ld)\n", + (long)off, SvPVX_const(sv), + (long)U_32(SvNVX(sv)), (long)SvIVX(sv)) ); } } @@ -970,6 +1058,7 @@ new one. void Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) { + dVAR; ASSERT_CURPAD_LEGAL("pad_swipe"); if (!PL_curpad) return; @@ -987,8 +1076,15 @@ Perl_pad_swipe(pTHX_ PADOFFSET po, bool refadjust) if (refadjust) SvREFCNT_dec(PL_curpad[po]); + + /* if pad tmps aren't shared between ops, then there's no need to + * create a new tmp when an existing op is freed */ +#ifdef USE_BROKEN_PAD_RESET PL_curpad[po] = NEWSV(1107,0); SvPADTMP_on(PL_curpad[po]); +#else + PL_curpad[po] = &PL_sv_undef; +#endif if ((I32)po < PL_padix) PL_padix = po - 1; } @@ -1011,9 +1107,8 @@ Mark all the current temporaries for reuse void Perl_pad_reset(pTHX) { + dVAR; #ifdef USE_BROKEN_PAD_RESET - register I32 po; - if (AvARRAY(PL_comppad) != PL_curpad) Perl_croak(aTHX_ "panic: pad_reset curpad"); @@ -1025,6 +1120,7 @@ Perl_pad_reset(pTHX) ); if (!PL_tainting) { /* Can't mix tainted and non-tainted temporaries. */ + register I32 po; for (po = AvMAX(PL_comppad); po > PL_padix_floor; po--) { if (PL_curpad[po] && !SvIMMORTAL(PL_curpad[po])) SvPADTMP_off(PL_curpad[po]); @@ -1055,15 +1151,40 @@ Tidy up a pad after we've finished compiling it: void Perl_pad_tidy(pTHX_ padtidy_type type) { - PADOFFSET ix; + dVAR; ASSERT_CURPAD_ACTIVE("pad_tidy"); + + /* If this CV has had any 'eval-capable' ops planted in it + * (ie it contains eval '...', //ee, /$var/ or /(?{..})/), Then any + * anon prototypes in the chain of CVs should be marked as cloneable, + * so that for example the eval's CV in C<< sub { eval '$x' } >> gets + * the right CvOUTSIDE. + * If running with -d, *any* sub may potentially have an eval + * excuted within it. + */ + + if (PL_cv_has_eval || PL_perldb) { + const CV *cv; + for (cv = PL_compcv ;cv; cv = CvOUTSIDE(cv)) { + if (cv != PL_compcv && CvCOMPILED(cv)) + break; /* no need to mark already-compiled code */ + if (CvANON(cv)) { + DEBUG_Xv(PerlIO_printf(Perl_debug_log, + "Pad clone on cv=0x%"UVxf"\n", PTR2UV(cv))); + CvCLONE_on(cv); + } + } + } + /* extend curpad to match namepad */ if (AvFILLp(PL_comppad_name) < AvFILLp(PL_comppad)) av_store(PL_comppad_name, AvFILLp(PL_comppad), Nullsv); if (type == padtidy_SUBCLONE) { - SV **namep = AvARRAY(PL_comppad_name); + SV * const * const namep = AvARRAY(PL_comppad_name); + PADOFFSET ix; + for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { SV *namesv; @@ -1071,13 +1192,12 @@ Perl_pad_tidy(pTHX_ padtidy_type type) continue; /* * The only things that a clonable function needs in its - * pad are references to outer lexicals and anonymous subs. + * pad are anonymous subs. * The rest are created anew during cloning. */ if (!((namesv = namep[ix]) != Nullsv && namesv != &PL_sv_undef && - (SvFAKE(namesv) || - *SvPVX(namesv) == '&'))) + *SvPVX_const(namesv) == '&')) { SvREFCNT_dec(PL_curpad[ix]); PL_curpad[ix] = Nullsv; @@ -1086,15 +1206,16 @@ Perl_pad_tidy(pTHX_ padtidy_type type) } else if (type == padtidy_SUB) { /* XXX DAPM this same bit of code keeps appearing !!! Rationalise? */ - AV *av = newAV(); /* Will be @_ */ + AV * const av = newAV(); /* Will be @_ */ av_extend(av, 0); av_store(PL_comppad, 0, (SV*)av); - AvFLAGS(av) = AVf_REIFY; + AvREIFY_only(av); } /* XXX DAPM rationalise these two similar branches */ if (type == padtidy_SUB) { + PADOFFSET ix; for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { if (SvIMMORTAL(PL_curpad[ix]) || IS_PADGV(PL_curpad[ix]) || IS_PADCONST(PL_curpad[ix])) continue; @@ -1103,6 +1224,7 @@ Perl_pad_tidy(pTHX_ padtidy_type type) } } else if (type == padtidy_FORMAT) { + PADOFFSET ix; for (ix = AvFILLp(PL_comppad); ix > 0; ix--) { if (!SvPADMY(PL_curpad[ix]) && !SvIMMORTAL(PL_curpad[ix])) SvPADTMP_on(PL_curpad[ix]); @@ -1115,7 +1237,7 @@ Perl_pad_tidy(pTHX_ padtidy_type type) /* =for apidoc pad_free -Free the SV at offet po in the current pad. +Free the SV at offset po in the current pad. =cut */ @@ -1124,6 +1246,7 @@ Free the SV at offet po in the current pad. void Perl_pad_free(pTHX_ PADOFFSET po) { + dVAR; ASSERT_CURPAD_LEGAL("pad_free"); if (!PL_curpad) return; @@ -1140,13 +1263,15 @@ Perl_pad_free(pTHX_ PADOFFSET po) if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) { SvPADTMP_off(PL_curpad[po]); #ifdef USE_ITHREADS -#ifdef PERL_COPY_ON_WRITE - if (SvIsCOW(PL_curpad[po])) { - sv_force_normal_flags(PL_curpad[po], SV_COW_DROP_PV); - } else + /* SV could be a shared hash key (eg bugid #19022) */ + if ( +#ifdef PERL_OLD_COPY_ON_WRITE + !SvIsCOW(PL_curpad[po]) +#else + !SvFAKE(PL_curpad[po]) #endif + ) SvREADONLY_off(PL_curpad[po]); /* could be a freed constant */ - #endif } if ((I32)po < PL_padix) @@ -1166,11 +1291,11 @@ Dump the contents of a padlist void Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) { - AV *pad_name; - AV *pad; + dVAR; + const AV *pad_name; + const AV *pad; SV **pname; SV **ppad; - SV *namesv; I32 ix; if (!padlist) { @@ -1186,21 +1311,32 @@ Perl_do_dump_pad(pTHX_ I32 level, PerlIO *file, PADLIST *padlist, int full) ); for (ix = 1; ix <= AvFILLp(pad_name); ix++) { - namesv = pname[ix]; + const SV *namesv = pname[ix]; if (namesv && namesv == &PL_sv_undef) { namesv = Nullsv; } if (namesv) { - Perl_dump_indent(aTHX_ level+1, file, - "%2d. 0x%"UVxf"<%lu> %s (%lu,%lu) \"%s\"\n", - (int) ix, - PTR2UV(ppad[ix]), - (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), - SvFAKE(namesv) ? "FAKE" : " ", - (unsigned long)I_32(SvNVX(namesv)), - (unsigned long)SvIVX(namesv), - SvPVX(namesv) - ); + if (SvFAKE(namesv)) + Perl_dump_indent(aTHX_ level+1, file, + "%2d. 0x%"UVxf"<%lu> FAKE \"%s\" flags=0x%lx index=%lu\n", + (int) ix, + PTR2UV(ppad[ix]), + (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), + SvPVX_const(namesv), + (unsigned long)SvIVX(namesv), + (unsigned long)SvNVX(namesv) + + ); + else + Perl_dump_indent(aTHX_ level+1, file, + "%2d. 0x%"UVxf"<%lu> (%ld,%ld) \"%s\"\n", + (int) ix, + PTR2UV(ppad[ix]), + (unsigned long) (ppad[ix] ? SvREFCNT(ppad[ix]) : 0), + (long)U_32(SvNVX(namesv)), + (long)SvIVX(namesv), + SvPVX_const(namesv) + ); } else if (full) { Perl_dump_indent(aTHX_ level+1, file, @@ -1225,16 +1361,18 @@ dump the contents of a CV #ifdef DEBUGGING STATIC void -S_cv_dump(pTHX_ CV *cv, char *title) +S_cv_dump(pTHX_ const CV *cv, const char *title) { - CV *outside = CvOUTSIDE(cv); - AV* padlist = CvPADLIST(cv); + dVAR; + const CV * const outside = CvOUTSIDE(cv); + AV* const padlist = CvPADLIST(cv); PerlIO_printf(Perl_debug_log, " %s: CV=0x%"UVxf" (%s), OUTSIDE=0x%"UVxf" (%s)\n", title, PTR2UV(cv), (CvANON(cv) ? "ANON" + : (SvTYPE(cv) == SVt_PVFM) ? "FORMAT" : (cv == PL_main_cv) ? "MAIN" : CvUNIQUE(cv) ? "UNIQUE" : CvGV(cv) ? GvNAME(CvGV(cv)) : "UNDEFINED"), @@ -1268,41 +1406,41 @@ any outer lexicals. CV * Perl_cv_clone(pTHX_ CV *proto) { - CV *cv; - - LOCK_CRED_MUTEX; /* XXX create separate mutex */ - cv = cv_clone2(proto, CvOUTSIDE(proto)); - UNLOCK_CRED_MUTEX; /* XXX create separate mutex */ - return cv; -} - - -/* XXX DAPM separate out cv and paddish bits ??? - * ideally the CV-related stuff shouldn't be in pad.c - how about - * a cv.c? */ - -STATIC CV * -S_cv_clone2(pTHX_ CV *proto, CV *outside) -{ + dVAR; I32 ix; - AV* protopadlist = CvPADLIST(proto); - AV* protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); - AV* protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); - SV** pname = AvARRAY(protopad_name); - SV** ppad = AvARRAY(protopad); - I32 fname = AvFILLp(protopad_name); - I32 fpad = AvFILLp(protopad); - AV* comppadlist; + AV* const protopadlist = CvPADLIST(proto); + const AV* const protopad_name = (AV*)*av_fetch(protopadlist, 0, FALSE); + const AV* const protopad = (AV*)*av_fetch(protopadlist, 1, FALSE); + SV** const pname = AvARRAY(protopad_name); + SV** const ppad = AvARRAY(protopad); + const I32 fname = AvFILLp(protopad_name); + const I32 fpad = AvFILLp(protopad); CV* cv; + SV** outpad; + CV* outside; + long depth; assert(!CvUNIQUE(proto)); + /* Since cloneable anon subs can be nested, CvOUTSIDE may point + * to a prototype; we instead want the cloned parent who called us. + * Note that in general for formats, CvOUTSIDE != find_runcv */ + + outside = CvOUTSIDE(proto); + if (outside && CvCLONE(outside) && ! CvCLONED(outside)) + outside = find_runcv(NULL); + depth = CvDEPTH(outside); + assert(depth || SvTYPE(proto) == SVt_PVFM); + if (!depth) + depth = 1; + assert(CvPADLIST(outside)); + ENTER; SAVESPTR(PL_compcv); cv = PL_compcv = (CV*)NEWSV(1104, 0); sv_upgrade((SV *)cv, SvTYPE(proto)); - CvFLAGS(cv) = CvFLAGS(proto) & ~CVf_CLONE; + CvFLAGS(cv) = CvFLAGS(proto) & ~(CVf_CLONE|CVf_WEAKOUTSIDE); CvCLONED_on(cv); #ifdef USE_ITHREADS @@ -1313,77 +1451,66 @@ S_cv_clone2(pTHX_ CV *proto, CV *outside) #endif CvGV(cv) = CvGV(proto); CvSTASH(cv) = CvSTASH(proto); + OP_REFCNT_LOCK; CvROOT(cv) = OpREFCNT_inc(CvROOT(proto)); + OP_REFCNT_UNLOCK; CvSTART(cv) = CvSTART(proto); - if (outside) - CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); + CvOUTSIDE(cv) = (CV*)SvREFCNT_inc(outside); + CvOUTSIDE_SEQ(cv) = CvOUTSIDE_SEQ(proto); if (SvPOK(proto)) - sv_setpvn((SV*)cv, SvPVX(proto), SvCUR(proto)); + sv_setpvn((SV*)cv, SvPVX_const(proto), SvCUR(proto)); - CvPADLIST(cv) = comppadlist = pad_new(padnew_CLONE|padnew_SAVE); + CvPADLIST(cv) = pad_new(padnew_CLONE|padnew_SAVE); + av_fill(PL_comppad, fpad); for (ix = fname; ix >= 0; ix--) av_store(PL_comppad_name, ix, SvREFCNT_inc(pname[ix])); - av_fill(PL_comppad, fpad); PL_curpad = AvARRAY(PL_comppad); + outpad = AvARRAY(AvARRAY(CvPADLIST(outside))[depth]); + for (ix = fpad; ix > 0; ix--) { - SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; - if (namesv && namesv != &PL_sv_undef) { - char *name = SvPVX(namesv); /* XXX */ - if (SvFLAGS(namesv) & SVf_FAKE) { /* lexical from outside? */ - I32 off = pad_findlex(name, ix, SvIVX(namesv), - CvOUTSIDE(cv), cxstack_ix, 0, 0); - if (!off) - PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); - else if (off != ix) - Perl_croak(aTHX_ "panic: cv_clone: %s", name); + SV* const namesv = (ix <= fname) ? pname[ix] : Nullsv; + SV *sv = Nullsv; + if (namesv && namesv != &PL_sv_undef) { /* lexical */ + if (SvFAKE(namesv)) { /* lexical from outside? */ + sv = outpad[(I32)SvNVX(namesv)]; + assert(sv); + /* formats may have an inactive parent */ + if (SvTYPE(proto) == SVt_PVFM && SvPADSTALE(sv)) { + if (ckWARN(WARN_CLOSURE)) + Perl_warner(aTHX_ packWARN(WARN_CLOSURE), + "Variable \"%s\" is not available", SvPVX_const(namesv)); + sv = Nullsv; + } + else { + assert(!SvPADSTALE(sv)); + sv = SvREFCNT_inc(sv); + } } - else { /* our own lexical */ - SV* sv; - if (*name == '&') { - /* anon code -- we'll come back for it */ + if (!sv) { + const char sigil = SvPVX_const(namesv)[0]; + if (sigil == '&') sv = SvREFCNT_inc(ppad[ix]); - } - else if (*name == '@') + else if (sigil == '@') sv = (SV*)newAV(); - else if (*name == '%') + else if (sigil == '%') sv = (SV*)newHV(); else sv = NEWSV(0, 0); - if (!SvPADBUSY(sv)) - SvPADMY_on(sv); - PL_curpad[ix] = sv; + SvPADMY_on(sv); } } else if (IS_PADGV(ppad[ix]) || IS_PADCONST(ppad[ix])) { - PL_curpad[ix] = SvREFCNT_inc(ppad[ix]); + sv = SvREFCNT_inc(ppad[ix]); } else { - SV* sv = NEWSV(0, 0); + sv = NEWSV(0, 0); SvPADTMP_on(sv); - PL_curpad[ix] = sv; - } - } - - /* Now that vars are all in place, clone nested closures. */ - - for (ix = fpad; ix > 0; ix--) { - SV* namesv = (ix <= fname) ? pname[ix] : Nullsv; - if (namesv - && namesv != &PL_sv_undef - && !(SvFLAGS(namesv) & SVf_FAKE) - && *SvPVX(namesv) == '&' - && CvCLONE(ppad[ix])) - { - CV *kid = cv_clone2((CV*)ppad[ix], cv); - SvREFCNT_dec(ppad[ix]); - CvCLONE_on(kid); - SvPADMY_on(kid); - PL_curpad[ix] = (SV*)kid; } + PL_curpad[ix] = sv; } DEBUG_Xv( @@ -1396,11 +1523,19 @@ S_cv_clone2(pTHX_ CV *proto, CV *outside) LEAVE; if (CvCONST(cv)) { - SV* const_sv = op_const_sv(CvSTART(cv), cv); - assert(const_sv); - /* constant sub () { $x } closing over $x - see lib/constant.pm */ - SvREFCNT_dec(cv); - cv = newCONSTSUB(CvSTASH(proto), 0, const_sv); + /* Constant sub () { $x } closing over $x - see lib/constant.pm: + * The prototype was marked as a candiate for const-ization, + * so try to grab the current const value, and if successful, + * turn into a const sub: + */ + SV* const const_sv = op_const_sv(CvSTART(cv), cv); + if (const_sv) { + SvREFCNT_dec(cv); + cv = newCONSTSUB(CvSTASH(proto), Nullch, const_sv); + } + else { + CvCONST_off(cv); + } } return cv; @@ -1411,7 +1546,8 @@ S_cv_clone2(pTHX_ CV *proto, CV *outside) =for apidoc pad_fixup_inner_anons For any anon CVs in the pad, change CvOUTSIDE of that CV from -old_cv to new_cv if necessary. +old_cv to new_cv if necessary. Needed when a newly-compiled CV has to be +moved to a pre-existing CV struct. =cut */ @@ -1419,85 +1555,109 @@ old_cv to new_cv if necessary. void Perl_pad_fixup_inner_anons(pTHX_ PADLIST *padlist, CV *old_cv, CV *new_cv) { + dVAR; I32 ix; - AV *comppad_name = (AV*)AvARRAY(padlist)[0]; - AV *comppad = (AV*)AvARRAY(padlist)[1]; - SV **namepad = AvARRAY(comppad_name); - SV **curpad = AvARRAY(comppad); + AV * const comppad_name = (AV*)AvARRAY(padlist)[0]; + AV * const comppad = (AV*)AvARRAY(padlist)[1]; + SV ** const namepad = AvARRAY(comppad_name); + SV ** const curpad = AvARRAY(comppad); for (ix = AvFILLp(comppad_name); ix > 0; ix--) { - SV *namesv = namepad[ix]; + const SV * const namesv = namepad[ix]; if (namesv && namesv != &PL_sv_undef - && *SvPVX(namesv) == '&') + && *SvPVX_const(namesv) == '&') { - CV *innercv = (CV*)curpad[ix]; - if (CvOUTSIDE(innercv) == old_cv) { - CvOUTSIDE(innercv) = new_cv; - if (!CvANON(innercv) || CvCLONED(innercv)) { - (void)SvREFCNT_inc(new_cv); - SvREFCNT_dec(old_cv); - } - } + CV * const innercv = (CV*)curpad[ix]; + assert(CvWEAKOUTSIDE(innercv)); + assert(CvOUTSIDE(innercv) == old_cv); + CvOUTSIDE(innercv) = new_cv; } } } + /* =for apidoc pad_push Push a new pad frame onto the padlist, unless there's already a pad at -this depth, in which case don't bother creating a new one. -If has_args is true, give the new pad an @_ in slot zero. +this depth, in which case don't bother creating a new one. Then give +the new pad an @_ in slot zero. =cut */ void -Perl_pad_push(pTHX_ PADLIST *padlist, int depth, int has_args) +Perl_pad_push(pTHX_ PADLIST *padlist, int depth) { + dVAR; if (depth <= AvFILLp(padlist)) return; { - SV** svp = AvARRAY(padlist); - AV *newpad = newAV(); - SV **oldpad = AvARRAY(svp[depth-1]); + SV** const svp = AvARRAY(padlist); + AV* const newpad = newAV(); + SV** const oldpad = AvARRAY(svp[depth-1]); I32 ix = AvFILLp((AV*)svp[1]); - I32 names_fill = AvFILLp((AV*)svp[0]); - SV** names = AvARRAY(svp[0]); - SV* sv; + const I32 names_fill = AvFILLp((AV*)svp[0]); + SV** const names = AvARRAY(svp[0]); + AV *av; + for ( ;ix > 0; ix--) { if (names_fill >= ix && names[ix] != &PL_sv_undef) { - char *name = SvPVX(names[ix]); - if ((SvFLAGS(names[ix]) & SVf_FAKE) || *name == '&') { + const char sigil = SvPVX_const(names[ix])[0]; + if ((SvFLAGS(names[ix]) & SVf_FAKE) || sigil == '&') { /* outer lexical or anon code */ av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); } else { /* our own lexical */ - if (*name == '@') - av_store(newpad, ix, sv = (SV*)newAV()); - else if (*name == '%') - av_store(newpad, ix, sv = (SV*)newHV()); + SV *sv; + if (sigil == '@') + sv = (SV*)newAV(); + else if (sigil == '%') + sv = (SV*)newHV(); else - av_store(newpad, ix, sv = NEWSV(0, 0)); + sv = NEWSV(0, 0); + av_store(newpad, ix, sv); SvPADMY_on(sv); } } else if (IS_PADGV(oldpad[ix]) || IS_PADCONST(oldpad[ix])) { - av_store(newpad, ix, sv = SvREFCNT_inc(oldpad[ix])); + av_store(newpad, ix, SvREFCNT_inc(oldpad[ix])); } else { /* save temporaries on recursion? */ - av_store(newpad, ix, sv = NEWSV(0, 0)); + SV * const sv = NEWSV(0, 0); + av_store(newpad, ix, sv); SvPADTMP_on(sv); } } - if (has_args) { - AV* av = newAV(); - av_extend(av, 0); - av_store(newpad, 0, (SV*)av); - AvFLAGS(av) = AVf_REIFY; - } + av = newAV(); + av_extend(av, 0); + av_store(newpad, 0, (SV*)av); + AvREIFY_only(av); + av_store(padlist, depth, (SV*)newpad); AvFILLp(padlist) = depth; } } + + +HV * +Perl_pad_compname_type(pTHX_ const PADOFFSET po) +{ + dVAR; + SV* const * const av = av_fetch(PL_comppad_name, po, FALSE); + if ( SvFLAGS(*av) & SVpad_TYPED ) { + return SvSTASH(*av); + } + return NULL; +} + +/* + * Local variables: + * c-indentation-style: bsd + * c-basic-offset: 4 + * indent-tabs-mode: t + * End: + * + * ex: set ts=8 sts=4 sw=4 noet: + */