/* gv.c * * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, * 2000, 2001, 2002, 2003, 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. * */ /* * 'Mercy!' cried Gandalf. 'If the giving of information is to be the cure * of your inquisitiveness, I shall spend all the rest of my days answering * you. What more do you want to know?' * 'The names of all the stars, and of all living things, and the whole * history of Middle-earth and Over-heaven and of the Sundering Seas,' * laughed Pippin. */ /* =head1 GV Functions A GV is a structure which corresponds to to a Perl typeglob, ie *foo. It is a structure that holds a pointer to a scalar, an array, a hash etc, corresponding to $foo, @foo, %foo. GVs are usually found as values in stashes (symbol table hashes) where Perl stores its global variables. =cut */ #include "EXTERN.h" #define PERL_IN_GV_C #include "perl.h" static const char S_autoload[] = "AUTOLOAD"; static const STRLEN S_autolen = sizeof(S_autoload)-1; #ifdef PERL_DONT_CREATE_GVSV GV * Perl_gv_SVadd(pTHX_ GV *gv) { if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) Perl_croak(aTHX_ "Bad symbol for scalar"); if (!GvSV(gv)) GvSV(gv) = newSV(0); return gv; } #endif GV * Perl_gv_AVadd(pTHX_ register GV *gv) { if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) Perl_croak(aTHX_ "Bad symbol for array"); if (!GvAV(gv)) GvAV(gv) = newAV(); return gv; } GV * Perl_gv_HVadd(pTHX_ register GV *gv) { if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) Perl_croak(aTHX_ "Bad symbol for hash"); if (!GvHV(gv)) GvHV(gv) = newHV(); return gv; } GV * Perl_gv_IOadd(pTHX_ register GV *gv) { dVAR; if (!gv || SvTYPE((SV*)gv) != SVt_PVGV) { /* * if it walks like a dirhandle, then let's assume that * this is a dirhandle. */ const char * const fh = PL_op->op_type == OP_READDIR || PL_op->op_type == OP_TELLDIR || PL_op->op_type == OP_SEEKDIR || PL_op->op_type == OP_REWINDDIR || PL_op->op_type == OP_CLOSEDIR ? "dirhandle" : "filehandle"; Perl_croak(aTHX_ "Bad symbol for %s", fh); } if (!GvIOp(gv)) { #ifdef GV_UNIQUE_CHECK if (GvUNIQUE(gv)) { Perl_croak(aTHX_ "Bad symbol for filehandle (GV is unique)"); } #endif GvIOp(gv) = newIO(); } return gv; } GV * Perl_gv_fetchfile(pTHX_ const char *name) { return gv_fetchfile_flags(name, strlen(name), 0); } GV * Perl_gv_fetchfile_flags(pTHX_ const char *const name, const STRLEN namelen, const U32 flags) { dVAR; char smallbuf[128]; char *tmpbuf; const STRLEN tmplen = namelen + 2; GV *gv; PERL_UNUSED_ARG(flags); if (!PL_defstash) return NULL; if (tmplen <= sizeof smallbuf) tmpbuf = smallbuf; else Newx(tmpbuf, tmplen, char); /* This is where the debugger's %{"::_<$filename"} hash is created */ tmpbuf[0] = '_'; tmpbuf[1] = '<'; memcpy(tmpbuf + 2, name, namelen); gv = *(GV**)hv_fetch(PL_defstash, tmpbuf, tmplen, TRUE); if (!isGV(gv)) { gv_init(gv, PL_defstash, tmpbuf, tmplen, FALSE); #ifdef PERL_DONT_CREATE_GVSV GvSV(gv) = newSVpvn(name, namelen); #else sv_setpvn(GvSV(gv), name, namelen); #endif if (PERLDB_LINE) hv_magic(GvHVn(gv_AVadd(gv)), NULL, PERL_MAGIC_dbfile); } if (tmpbuf != smallbuf) Safefree(tmpbuf); return gv; } /* =for apidoc gv_const_sv If C is a typeglob whose subroutine entry is a constant sub eligible for inlining, or C is a placeholder reference that would be promoted to such a typeglob, then returns the value returned by the sub. Otherwise, returns NULL. =cut */ SV * Perl_gv_const_sv(pTHX_ GV *gv) { if (SvTYPE(gv) == SVt_PVGV) return cv_const_sv(GvCVu(gv)); return SvROK(gv) ? SvRV(gv) : NULL; } GP * Perl_newGP(pTHX_ GV *const gv) { GP *gp; const char *const file = (PL_curcop && CopFILE(PL_curcop)) ? CopFILE(PL_curcop) : ""; STRLEN len = strlen(file); U32 hash; PERL_HASH(hash, file, len); Newxz(gp, 1, GP); #ifndef PERL_DONT_CREATE_GVSV gp->gp_sv = newSV(0); #endif gp->gp_line = PL_curcop ? CopLINE(PL_curcop) : 0; /* XXX Ideally this cast would be replaced with a change to const char* in the struct. */ gp->gp_file_hek = share_hek(file, len, hash); gp->gp_egv = gv; gp->gp_refcnt = 1; return gp; } void Perl_gv_init(pTHX_ GV *gv, HV *stash, const char *name, STRLEN len, int multi) { dVAR; const U32 old_type = SvTYPE(gv); const bool doproto = old_type > SVt_NULL; const char * const proto = (doproto && SvPOK(gv)) ? SvPVX_const(gv) : NULL; SV *const has_constant = doproto && SvROK(gv) ? SvRV(gv) : NULL; const U32 exported_constant = has_constant ? SvPCS_IMPORTED(gv) : 0; assert (!(proto && has_constant)); if (has_constant) { /* The constant has to be a simple scalar type. */ switch (SvTYPE(has_constant)) { case SVt_PVAV: case SVt_PVHV: case SVt_PVCV: case SVt_PVFM: case SVt_PVIO: Perl_croak(aTHX_ "Cannot convert a reference to %s to typeglob", sv_reftype(has_constant, 0)); default: NOOP; } SvRV_set(gv, NULL); SvROK_off(gv); } if (old_type < SVt_PVGV) { if (old_type >= SVt_PV) SvCUR_set(gv, 0); sv_upgrade((SV*)gv, SVt_PVGV); } if (SvLEN(gv)) { if (proto) { SvPV_set(gv, NULL); SvLEN_set(gv, 0); SvPOK_off(gv); } else Safefree(SvPVX_mutable(gv)); } SvIOK_off(gv); isGV_with_GP_on(gv); GvGP(gv) = Perl_newGP(aTHX_ gv); GvSTASH(gv) = stash; if (stash) Perl_sv_add_backref(aTHX_ (SV*)stash, (SV*)gv); gv_name_set(gv, name, len, GV_ADD); if (multi || doproto) /* doproto means it _was_ mentioned */ GvMULTI_on(gv); if (doproto) { /* Replicate part of newSUB here. */ ENTER; if (has_constant) { /* newCONSTSUB takes ownership of the reference from us. */ GvCV(gv) = newCONSTSUB(stash, name, has_constant); /* If this reference was a copy of another, then the subroutine must have been "imported", by a Perl space assignment to a GV from a reference to CV. */ if (exported_constant) GvIMPORTED_CV_on(gv); } else { (void) start_subparse(0,0); /* Create empty CV in compcv. */ GvCV(gv) = PL_compcv; } LEAVE; mro_method_changed_in(GvSTASH(gv)); /* sub Foo::bar($) { (shift) } sub ASDF::baz($); *ASDF::baz = \&Foo::bar */ CvGV(GvCV(gv)) = gv; CvFILE_set_from_cop(GvCV(gv), PL_curcop); CvSTASH(GvCV(gv)) = PL_curstash; if (proto) { sv_setpv((SV*)GvCV(gv), proto); Safefree(proto); } } } STATIC void S_gv_init_sv(pTHX_ GV *gv, I32 sv_type) { switch (sv_type) { case SVt_PVIO: (void)GvIOn(gv); break; case SVt_PVAV: (void)GvAVn(gv); break; case SVt_PVHV: (void)GvHVn(gv); break; #ifdef PERL_DONT_CREATE_GVSV case SVt_NULL: case SVt_PVCV: case SVt_PVFM: case SVt_PVGV: break; default: if(GvSVn(gv)) { /* Work round what appears to be a bug in Sun C++ 5.8 2005/10/13 If we just cast GvSVn(gv) to void, it ignores evaluating it for its side effect */ } #endif } } /* =for apidoc gv_fetchmeth Returns the glob with the given C and a defined subroutine or C. The glob lives in the given C, or in the stashes accessible via @ISA and UNIVERSAL::. The argument C should be either 0 or -1. If C, as a side-effect creates a glob with the given C in the given C which in the case of success contains an alias for the subroutine, and sets up caching info for this glob. This function grants C<"SUPER"> token as a postfix of the stash name. The GV returned from C may be a method cache entry, which is not visible to Perl code. So when calling C, you should not use the GV directly; instead, you should use the method's CV, which can be obtained from the GV with the C macro. =cut */ /* NOTE: No support for tied ISA */ GV * Perl_gv_fetchmeth(pTHX_ HV *stash, const char *name, STRLEN len, I32 level) { dVAR; GV** gvp; AV* linear_av; SV** linear_svp; SV* linear_sv; HV* cstash; GV* candidate = NULL; CV* cand_cv = NULL; CV* old_cv; GV* topgv = NULL; const char *hvname; I32 create = (level >= 0) ? 1 : 0; I32 items; STRLEN packlen; U32 topgen_cmp; /* UNIVERSAL methods should be callable without a stash */ if (!stash) { create = 0; /* probably appropriate */ if(!(stash = gv_stashpvs("UNIVERSAL", 0))) return 0; } assert(stash); hvname = HvNAME_get(stash); if (!hvname) Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup"); assert(hvname); assert(name); DEBUG_o( Perl_deb(aTHX_ "Looking for method %s in package %s\n",name,hvname) ); topgen_cmp = HvMROMETA(stash)->sub_generation + PL_sub_generation; /* check locally for a real method or a cache entry */ gvp = (GV**)hv_fetch(stash, name, len, create); if(gvp) { topgv = *gvp; assert(topgv); if (SvTYPE(topgv) != SVt_PVGV) gv_init(topgv, stash, name, len, TRUE); if ((cand_cv = GvCV(topgv))) { /* If genuine method or valid cache entry, use it */ if (!GvCVGEN(topgv) || GvCVGEN(topgv) == topgen_cmp) { return topgv; } else { /* stale cache entry, junk it and move on */ SvREFCNT_dec(cand_cv); GvCV(topgv) = cand_cv = NULL; GvCVGEN(topgv) = 0; } } else if (GvCVGEN(topgv) == topgen_cmp) { /* cache indicates no such method definitively */ return 0; } } packlen = HvNAMELEN_get(stash); if (packlen >= 7 && strEQ(hvname + packlen - 7, "::SUPER")) { HV* basestash; packlen -= 7; basestash = gv_stashpvn(hvname, packlen, GV_ADD); linear_av = mro_get_linear_isa(basestash); } else { linear_av = mro_get_linear_isa(stash); /* has ourselves at the top of the list */ } linear_svp = AvARRAY(linear_av) + 1; /* skip over self */ items = AvFILLp(linear_av); /* no +1, to skip over self */ while (items--) { linear_sv = *linear_svp++; assert(linear_sv); cstash = gv_stashsv(linear_sv, 0); /* mg.c:Perl_magic_setisa sets the fake flag on packages it had to create that the user did not. The "package" statement clears it. We also check if there's anything in the symbol table at all, which would indicate a previously "fake" package where someone adding things via $Foo::Bar = 1 without ever using a "package" statement. This was all neccesary because magic_setisa needs a place to keep isarev information on packages that aren't yet defined, yet we still need to issue this warning when appropriate. */ if (!cstash || (HvMROMETA(cstash)->fake && !HvFILL(cstash))) { if (ckWARN(WARN_SYNTAX)) Perl_warner(aTHX_ packWARN(WARN_SYNTAX), "Can't locate package %"SVf" for @%s::ISA", SVfARG(linear_sv), hvname); continue; } assert(cstash); gvp = (GV**)hv_fetch(cstash, name, len, 0); if (!gvp) continue; candidate = *gvp; assert(candidate); if (SvTYPE(candidate) != SVt_PVGV) gv_init(candidate, cstash, name, len, TRUE); if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) { /* * Found real method, cache method in topgv if: * 1. topgv has no synonyms (else inheritance crosses wires) * 2. method isn't a stub (else AUTOLOAD fails spectacularly) */ if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) { if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv); SvREFCNT_inc_simple_void_NN(cand_cv); GvCV(topgv) = cand_cv; GvCVGEN(topgv) = topgen_cmp; } return candidate; } } /* Check UNIVERSAL without caching */ if(level == 0 || level == -1) { candidate = gv_fetchmeth(NULL, name, len, 1); if(candidate) { cand_cv = GvCV(candidate); if (topgv && (GvREFCNT(topgv) == 1) && (CvROOT(cand_cv) || CvXSUB(cand_cv))) { if ((old_cv = GvCV(topgv))) SvREFCNT_dec(old_cv); SvREFCNT_inc_simple_void_NN(cand_cv); GvCV(topgv) = cand_cv; GvCVGEN(topgv) = topgen_cmp; } return candidate; } } if (topgv && GvREFCNT(topgv) == 1) { /* cache the fact that the method is not defined */ GvCVGEN(topgv) = topgen_cmp; } return 0; } /* =for apidoc gv_fetchmeth_autoload Same as gv_fetchmeth(), but looks for autoloaded subroutines too. Returns a glob for the subroutine. For an autoloaded subroutine without a GV, will create a GV even if C. For an autoloaded subroutine without a stub, GvCV() of the result may be zero. =cut */ GV * Perl_gv_fetchmeth_autoload(pTHX_ HV *stash, const char *name, STRLEN len, I32 level) { GV *gv = gv_fetchmeth(stash, name, len, level); if (!gv) { CV *cv; GV **gvp; if (!stash) return NULL; /* UNIVERSAL::AUTOLOAD could cause trouble */ if (len == S_autolen && strnEQ(name, S_autoload, S_autolen)) return NULL; if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE))) return NULL; cv = GvCV(gv); if (!(CvROOT(cv) || CvXSUB(cv))) return NULL; /* Have an autoload */ if (level < 0) /* Cannot do without a stub */ gv_fetchmeth(stash, name, len, 0); gvp = (GV**)hv_fetch(stash, name, len, (level >= 0)); if (!gvp) return NULL; return *gvp; } return gv; } /* =for apidoc gv_fetchmethod_autoload Returns the glob which contains the subroutine to call to invoke the method on the C. In fact in the presence of autoloading this may be the glob for "AUTOLOAD". In this case the corresponding variable $AUTOLOAD is already setup. The third parameter of C determines whether AUTOLOAD lookup is performed if the given method is not present: non-zero means yes, look for AUTOLOAD; zero means no, don't look for AUTOLOAD. Calling C is equivalent to calling C with a non-zero C parameter. These functions grant C<"SUPER"> token as a prefix of the method name. Note that if you want to keep the returned glob for a long time, you need to check for it being "AUTOLOAD", since at the later time the call may load a different subroutine due to $AUTOLOAD changing its value. Use the glob created via a side effect to do this. These functions have the same side-effects and as C with C. C should be writable if contains C<':'> or C<' ''>. The warning against passing the GV returned by C to C apply equally to these functions. =cut */ GV * Perl_gv_fetchmethod_autoload(pTHX_ HV *stash, const char *name, I32 autoload) { dVAR; register const char *nend; const char *nsplit = NULL; GV* gv; HV* ostash = stash; if (stash && SvTYPE(stash) < SVt_PVHV) stash = NULL; for (nend = name; *nend; nend++) { if (*nend == '\'') nsplit = nend; else if (*nend == ':' && *(nend + 1) == ':') nsplit = ++nend; } if (nsplit) { const char * const origname = name; name = nsplit + 1; if (*nsplit == ':') --nsplit; if ((nsplit - origname) == 5 && strnEQ(origname, "SUPER", 5)) { /* ->SUPER::method should really be looked up in original stash */ SV * const tmpstr = sv_2mortal(Perl_newSVpvf(aTHX_ "%s::SUPER", CopSTASHPV(PL_curcop))); /* __PACKAGE__::SUPER stash should be autovivified */ stash = gv_stashpvn(SvPVX_const(tmpstr), SvCUR(tmpstr), GV_ADD); DEBUG_o( Perl_deb(aTHX_ "Treating %s as %s::%s\n", origname, HvNAME_get(stash), name) ); } else { /* don't autovifify if ->NoSuchStash::method */ stash = gv_stashpvn(origname, nsplit - origname, 0); /* however, explicit calls to Pkg::SUPER::method may happen, and may require autovivification to work */ if (!stash && (nsplit - origname) >= 7 && strnEQ(nsplit - 7, "::SUPER", 7) && gv_stashpvn(origname, nsplit - origname - 7, 0)) stash = gv_stashpvn(origname, nsplit - origname, GV_ADD); } ostash = stash; } gv = gv_fetchmeth(stash, name, nend - name, 0); if (!gv) { if (strEQ(name,"import") || strEQ(name,"unimport")) gv = (GV*)&PL_sv_yes; else if (autoload) gv = gv_autoload4(ostash, name, nend - name, TRUE); } else if (autoload) { CV* const cv = GvCV(gv); if (!CvROOT(cv) && !CvXSUB(cv)) { GV* stubgv; GV* autogv; if (CvANON(cv)) stubgv = gv; else { stubgv = CvGV(cv); if (GvCV(stubgv) != cv) /* orphaned import */ stubgv = gv; } autogv = gv_autoload4(GvSTASH(stubgv), GvNAME(stubgv), GvNAMELEN(stubgv), TRUE); if (autogv) gv = autogv; } } return gv; } GV* Perl_gv_autoload4(pTHX_ HV *stash, const char *name, STRLEN len, I32 method) { dVAR; GV* gv; CV* cv; HV* varstash; GV* vargv; SV* varsv; const char *packname = ""; STRLEN packname_len = 0; if (len == S_autolen && strnEQ(name, S_autoload, S_autolen)) return NULL; if (stash) { if (SvTYPE(stash) < SVt_PVHV) { packname = SvPV_const((SV*)stash, packname_len); stash = NULL; } else { packname = HvNAME_get(stash); packname_len = HvNAMELEN_get(stash); } } if (!(gv = gv_fetchmeth(stash, S_autoload, S_autolen, FALSE))) return NULL; cv = GvCV(gv); if (!(CvROOT(cv) || CvXSUB(cv))) return NULL; /* * Inheriting AUTOLOAD for non-methods works ... for now. */ if (!method && (GvCVGEN(gv) || GvSTASH(gv) != stash) && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX) ) Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX), "Use of inherited AUTOLOAD for non-method %s::%.*s() is deprecated", packname, (int)len, name); if (CvISXSUB(cv)) { /* rather than lookup/init $AUTOLOAD here * only to have the XSUB do another lookup for $AUTOLOAD * and split that value on the last '::', * pass along the same data via some unused fields in the CV */ CvSTASH(cv) = stash; SvPV_set(cv, (char *)name); /* cast to lose constness warning */ SvCUR_set(cv, len); return gv; } /* * Given &FOO::AUTOLOAD, set $FOO::AUTOLOAD to desired function name. * The subroutine's original name may not be "AUTOLOAD", so we don't * use that, but for lack of anything better we will use the sub's * original package to look up $AUTOLOAD. */ varstash = GvSTASH(CvGV(cv)); vargv = *(GV**)hv_fetch(varstash, S_autoload, S_autolen, TRUE); ENTER; if (!isGV(vargv)) { gv_init(vargv, varstash, S_autoload, S_autolen, FALSE); #ifdef PERL_DONT_CREATE_GVSV GvSV(vargv) = newSV(0); #endif } LEAVE; varsv = GvSVn(vargv); sv_setpvn(varsv, packname, packname_len); sv_catpvs(varsv, "::"); sv_catpvn(varsv, name, len); return gv; } /* require_tie_mod() internal routine for requiring a module * that implements the logic of automatical ties like %! and %- * * The "gv" parameter should be the glob. * "varpv" holds the name of the var, used for error messages. * "namesv" holds the module name. Its refcount will be decremented. * "methpv" holds the method name to test for to check that things * are working reasonably close to as expected. * "flags": if flag & 1 then save the scalar before loading. * For the protection of $! to work (it is set by this routine) * the sv slot must already be magicalized. */ STATIC HV* S_require_tie_mod(pTHX_ GV *gv, const char *varpv, SV* namesv, const char *methpv,const U32 flags) { dVAR; HV* stash = gv_stashsv(namesv, 0); if (!stash || !(gv_fetchmethod(stash, methpv))) { SV *module = newSVsv(namesv); char varname = *varpv; /* varpv might be clobbered by load_module, so save it. For the moment it's always a single char. */ dSP; ENTER; if ( flags & 1 ) save_scalar(gv); PUSHSTACKi(PERLSI_MAGIC); Perl_load_module(aTHX_ PERL_LOADMOD_NOIMPORT, module, NULL); POPSTACK; LEAVE; SPAGAIN; stash = gv_stashsv(namesv, 0); if (!stash) Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" is not available", varname, SVfARG(namesv)); else if (!gv_fetchmethod(stash, methpv)) Perl_croak(aTHX_ "panic: Can't use %%%c because %"SVf" does not support method %s", varname, SVfARG(namesv), methpv); } SvREFCNT_dec(namesv); return stash; } /* =for apidoc gv_stashpv Returns a pointer to the stash for a specified package. Uses C to determine the length of C, then calls C. =cut */ HV* Perl_gv_stashpv(pTHX_ const char *name, I32 create) { return gv_stashpvn(name, strlen(name), create); } /* =for apidoc gv_stashpvn Returns a pointer to the stash for a specified package. The C parameter indicates the length of the C, in bytes. C is passed to C, so if set to C then the package will be created if it does not already exist. If the package does not exist and C is 0 (or any other setting that does not create packages) then NULL is returned. =cut */ HV* Perl_gv_stashpvn(pTHX_ const char *name, U32 namelen, I32 flags) { char smallbuf[128]; char *tmpbuf; HV *stash; GV *tmpgv; if (namelen + 2 <= sizeof smallbuf) tmpbuf = smallbuf; else Newx(tmpbuf, namelen + 2, char); Copy(name,tmpbuf,namelen,char); tmpbuf[namelen++] = ':'; tmpbuf[namelen++] = ':'; tmpgv = gv_fetchpvn_flags(tmpbuf, namelen, flags, SVt_PVHV); if (tmpbuf != smallbuf) Safefree(tmpbuf); if (!tmpgv) return NULL; if (!GvHV(tmpgv)) GvHV(tmpgv) = newHV(); stash = GvHV(tmpgv); if (!HvNAME_get(stash)) hv_name_set(stash, name, namelen, 0); return stash; } /* =for apidoc gv_stashsv Returns a pointer to the stash for a specified package. See C. =cut */ HV* Perl_gv_stashsv(pTHX_ SV *sv, I32 flags) { STRLEN len; const char * const ptr = SvPV_const(sv,len); return gv_stashpvn(ptr, len, flags); } GV * Perl_gv_fetchpv(pTHX_ const char *nambeg, I32 add, I32 sv_type) { return gv_fetchpvn_flags(nambeg, strlen(nambeg), add, sv_type); } GV * Perl_gv_fetchsv(pTHX_ SV *name, I32 flags, I32 sv_type) { STRLEN len; const char * const nambeg = SvPV_const(name, len); return gv_fetchpvn_flags(nambeg, len, flags | SvUTF8(name), sv_type); } GV * Perl_gv_fetchpvn_flags(pTHX_ const char *nambeg, STRLEN full_len, I32 flags, I32 sv_type) { dVAR; register const char *name = nambeg; register GV *gv = NULL; GV**gvp; I32 len; register const char *name_cursor; HV *stash = NULL; const I32 no_init = flags & (GV_NOADD_NOINIT | GV_NOINIT); const I32 no_expand = flags & GV_NOEXPAND; const I32 add = flags & ~GV_NOADD_MASK; const char *const name_end = nambeg + full_len; const char *const name_em1 = name_end - 1; if (flags & GV_NOTQUAL) { /* Caller promised that there is no stash, so we can skip the check. */ len = full_len; goto no_stash; } if (full_len > 2 && *name == '*' && isALPHA(name[1])) { /* accidental stringify on a GV? */ name++; } for (name_cursor = name; name_cursor < name_end; name_cursor++) { if ((*name_cursor == ':' && name_cursor < name_em1 && name_cursor[1] == ':') || (*name_cursor == '\'' && name_cursor[1])) { if (!stash) stash = PL_defstash; if (!stash || !SvREFCNT(stash)) /* symbol table under destruction */ return NULL; len = name_cursor - name; if (len > 0) { char smallbuf[128]; char *tmpbuf; if (len + 2 <= (I32)sizeof (smallbuf)) tmpbuf = smallbuf; else Newx(tmpbuf, len+2, char); Copy(name, tmpbuf, len, char); tmpbuf[len++] = ':'; tmpbuf[len++] = ':'; gvp = (GV**)hv_fetch(stash,tmpbuf,len,add); gv = gvp ? *gvp : NULL; if (gv && gv != (GV*)&PL_sv_undef) { if (SvTYPE(gv) != SVt_PVGV) gv_init(gv, stash, tmpbuf, len, (add & GV_ADDMULTI)); else GvMULTI_on(gv); } if (tmpbuf != smallbuf) Safefree(tmpbuf); if (!gv || gv == (GV*)&PL_sv_undef) return NULL; if (!(stash = GvHV(gv))) stash = GvHV(gv) = newHV(); if (!HvNAME_get(stash)) hv_name_set(stash, nambeg, name_cursor - nambeg, 0); } if (*name_cursor == ':') name_cursor++; name_cursor++; name = name_cursor; if (name == name_end) return gv ? gv : (GV*)*hv_fetchs(PL_defstash, "main::", TRUE); } } len = name_cursor - name; /* No stash in name, so see how we can default */ if (!stash) { no_stash: if (len && isIDFIRST_lazy(name)) { bool global = FALSE; switch (len) { case 1: if (*name == '_') global = TRUE; break; case 3: if ((name[0] == 'I' && name[1] == 'N' && name[2] == 'C') || (name[0] == 'E' && name[1] == 'N' && name[2] == 'V') || (name[0] == 'S' && name[1] == 'I' && name[2] == 'G')) global = TRUE; break; case 4: if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G' && name[3] == 'V') global = TRUE; break; case 5: if (name[0] == 'S' && name[1] == 'T' && name[2] == 'D' && name[3] == 'I' && name[4] == 'N') global = TRUE; break; case 6: if ((name[0] == 'S' && name[1] == 'T' && name[2] == 'D') &&((name[3] == 'O' && name[4] == 'U' && name[5] == 'T') ||(name[3] == 'E' && name[4] == 'R' && name[5] == 'R'))) global = TRUE; break; case 7: if (name[0] == 'A' && name[1] == 'R' && name[2] == 'G' && name[3] == 'V' && name[4] == 'O' && name[5] == 'U' && name[6] == 'T') global = TRUE; break; } if (global) stash = PL_defstash; else if (IN_PERL_COMPILETIME) { stash = PL_curstash; if (add && (PL_hints & HINT_STRICT_VARS) && sv_type != SVt_PVCV && sv_type != SVt_PVGV && sv_type != SVt_PVFM && sv_type != SVt_PVIO && !(len == 1 && sv_type == SVt_PV && (*name == 'a' || *name == 'b')) ) { gvp = (GV**)hv_fetch(stash,name,len,0); if (!gvp || *gvp == (GV*)&PL_sv_undef || SvTYPE(*gvp) != SVt_PVGV) { stash = NULL; } else if ((sv_type == SVt_PV && !GvIMPORTED_SV(*gvp)) || (sv_type == SVt_PVAV && !GvIMPORTED_AV(*gvp)) || (sv_type == SVt_PVHV && !GvIMPORTED_HV(*gvp)) ) { Perl_warn(aTHX_ "Variable \"%c%s\" is not imported", sv_type == SVt_PVAV ? '@' : sv_type == SVt_PVHV ? '%' : '$', name); if (GvCVu(*gvp)) Perl_warn(aTHX_ "\t(Did you mean &%s instead?)\n", name); stash = NULL; } } } else stash = CopSTASH(PL_curcop); } else stash = PL_defstash; } /* By this point we should have a stash and a name */ if (!stash) { if (add) { SV * const err = Perl_mess(aTHX_ "Global symbol \"%s%s\" requires explicit package name", (sv_type == SVt_PV ? "$" : sv_type == SVt_PVAV ? "@" : sv_type == SVt_PVHV ? "%" : ""), name); GV *gv; if (USE_UTF8_IN_NAMES) SvUTF8_on(err); qerror(err); gv = gv_fetchpvn_flags("::", 8, GV_ADDMULTI, SVt_PVHV); if(!gv) { /* symbol table under destruction */ return NULL; } stash = GvHV(gv); } else return NULL; } if (!SvREFCNT(stash)) /* symbol table under destruction */ return NULL; gvp = (GV**)hv_fetch(stash,name,len,add); if (!gvp || *gvp == (GV*)&PL_sv_undef) return NULL; gv = *gvp; if (SvTYPE(gv) == SVt_PVGV) { if (add) { GvMULTI_on(gv); gv_init_sv(gv, sv_type); if (len == 1 && (sv_type == SVt_PVHV || sv_type == SVt_PVGV)) { if (*name == '!') require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1); else if (*name == '-' || *name == '+') require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "FETCH", 0); } } return gv; } else if (no_init) { return gv; } else if (no_expand && SvROK(gv)) { return gv; } /* Adding a new symbol */ if (add & GV_ADDWARN && ckWARN_d(WARN_INTERNAL)) Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Had to create %s unexpectedly", nambeg); gv_init(gv, stash, name, len, add & GV_ADDMULTI); gv_init_sv(gv, sv_type); if (isALPHA(name[0]) && ! (isLEXWARN_on ? ckWARN(WARN_ONCE) : (PL_dowarn & G_WARN_ON ) ) ) GvMULTI_on(gv) ; /* set up magic where warranted */ if (len > 1) { #ifndef EBCDIC if (*name > 'V' ) { NOOP; /* Nothing else to do. The compiler will probably turn the switch statement into a branch table. Make sure we avoid even that small overhead for the common case of lower case variable names. */ } else #endif { const char * const name2 = name + 1; switch (*name) { case 'A': if (strEQ(name2, "RGV")) { IoFLAGS(GvIOn(gv)) |= IOf_ARGV|IOf_START; } else if (strEQ(name2, "RGVOUT")) { GvMULTI_on(gv); } break; case 'E': if (strnEQ(name2, "XPORT", 5)) GvMULTI_on(gv); break; case 'I': if (strEQ(name2, "SA")) { AV* const av = GvAVn(gv); GvMULTI_on(gv); sv_magic((SV*)av, (SV*)gv, PERL_MAGIC_isa, NULL, 0); /* NOTE: No support for tied ISA */ if ((add & GV_ADDMULTI) && strEQ(nambeg,"AnyDBM_File::ISA") && AvFILLp(av) == -1) { const char *pname; av_push(av, newSVpvn(pname = "NDBM_File",9)); gv_stashpvn(pname, 9, GV_ADD); av_push(av, newSVpvn(pname = "DB_File",7)); gv_stashpvn(pname, 7, GV_ADD); av_push(av, newSVpvn(pname = "GDBM_File",9)); gv_stashpvn(pname, 9, GV_ADD); av_push(av, newSVpvn(pname = "SDBM_File",9)); gv_stashpvn(pname, 9, GV_ADD); av_push(av, newSVpvn(pname = "ODBM_File",9)); gv_stashpvn(pname, 9, GV_ADD); } } break; case 'O': if (strEQ(name2, "VERLOAD")) { HV* const hv = GvHVn(gv); GvMULTI_on(gv); hv_magic(hv, NULL, PERL_MAGIC_overload); } break; case 'S': if (strEQ(name2, "IG")) { HV *hv; I32 i; if (!PL_psig_ptr) { Newxz(PL_psig_ptr, SIG_SIZE, SV*); Newxz(PL_psig_name, SIG_SIZE, SV*); Newxz(PL_psig_pend, SIG_SIZE, int); } GvMULTI_on(gv); hv = GvHVn(gv); hv_magic(hv, NULL, PERL_MAGIC_sig); for (i = 1; i < SIG_SIZE; i++) { SV * const * const init = hv_fetch(hv, PL_sig_name[i], strlen(PL_sig_name[i]), 1); if (init) sv_setsv(*init, &PL_sv_undef); PL_psig_ptr[i] = 0; PL_psig_name[i] = 0; PL_psig_pend[i] = 0; } } break; case 'V': if (strEQ(name2, "ERSION")) GvMULTI_on(gv); break; case '\003': /* $^CHILD_ERROR_NATIVE */ if (strEQ(name2, "HILD_ERROR_NATIVE")) goto magicalize; break; case '\005': /* $^ENCODING */ if (strEQ(name2, "NCODING")) goto magicalize; break; case '\015': /* $^MATCH */ if (strEQ(name2, "ATCH")) goto ro_magicalize; case '\017': /* $^OPEN */ if (strEQ(name2, "PEN")) goto magicalize; break; case '\020': /* $^PREMATCH $^POSTMATCH */ if (strEQ(name2, "REMATCH") || strEQ(name2, "OSTMATCH")) goto ro_magicalize; case '\024': /* ${^TAINT} */ if (strEQ(name2, "AINT")) goto ro_magicalize; break; case '\025': /* ${^UNICODE}, ${^UTF8LOCALE} */ if (strEQ(name2, "NICODE")) goto ro_magicalize; if (strEQ(name2, "TF8LOCALE")) goto ro_magicalize; if (strEQ(name2, "TF8CACHE")) goto magicalize; break; case '\027': /* $^WARNING_BITS */ if (strEQ(name2, "ARNING_BITS")) goto magicalize; break; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': { /* ensures variable is only digits */ /* ${"1foo"} fails this test (and is thus writeable) */ /* added by japhy, but borrowed from is_gv_magical */ const char *end = name + len; while (--end > name) { if (!isDIGIT(*end)) return gv; } goto ro_magicalize; } } } } else { /* Names of length 1. (Or 0. But name is NUL terminated, so that will be case '\0' in this switch statement (ie a default case) */ switch (*name) { case '&': case '`': case '\'': if ( sv_type == SVt_PVAV || sv_type == SVt_PVHV || sv_type == SVt_PVCV || sv_type == SVt_PVFM || sv_type == SVt_PVIO ) { break; } PL_sawampersand = TRUE; goto ro_magicalize; case ':': sv_setpv(GvSVn(gv),PL_chopset); goto magicalize; case '?': #ifdef COMPLEX_STATUS SvUPGRADE(GvSVn(gv), SVt_PVLV); #endif goto magicalize; case '!': GvMULTI_on(gv); /* If %! has been used, automatically load Errno.pm. */ sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len); /* magicalization must be done before require_tie_mod is called */ if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) require_tie_mod(gv, "!", newSVpvs("Errno"), "TIEHASH", 1); break; case '-': case '+': GvMULTI_on(gv); /* no used once warnings here */ { AV* const av = GvAVn(gv); SV* const avc = (*name == '+') ? (SV*)av : NULL; sv_magic((SV*)av, avc, PERL_MAGIC_regdata, NULL, 0); sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len); if (avc) SvREADONLY_on(GvSVn(gv)); SvREADONLY_on(av); if (sv_type == SVt_PVHV || sv_type == SVt_PVGV) require_tie_mod(gv, name, newSVpvs("Tie::Hash::NamedCapture"), "FETCH", 0); break; } case '*': case '#': if (sv_type == SVt_PV && ckWARN2(WARN_DEPRECATED, WARN_SYNTAX)) Perl_warner(aTHX_ packWARN2(WARN_DEPRECATED, WARN_SYNTAX), "$%c is no longer supported", *name); break; case '|': sv_setiv(GvSVn(gv), (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0); goto magicalize; case '\010': /* $^H */ { HV *const hv = GvHVn(gv); hv_magic(hv, NULL, PERL_MAGIC_hints); } goto magicalize; case '\023': /* $^S */ case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': ro_magicalize: SvREADONLY_on(GvSVn(gv)); /* FALL THROUGH */ case '[': case '^': case '~': case '=': case '%': case '.': case '(': case ')': case '<': case '>': case ',': case '\\': case '/': case '\001': /* $^A */ case '\003': /* $^C */ case '\004': /* $^D */ case '\005': /* $^E */ case '\006': /* $^F */ case '\011': /* $^I, NOT \t in EBCDIC */ case '\016': /* $^N */ case '\017': /* $^O */ case '\020': /* $^P */ case '\024': /* $^T */ case '\027': /* $^W */ magicalize: sv_magic(GvSVn(gv), (SV*)gv, PERL_MAGIC_sv, name, len); break; case '\014': /* $^L */ sv_setpvn(GvSVn(gv),"\f",1); PL_formfeed = GvSVn(gv); break; case ';': sv_setpvn(GvSVn(gv),"\034",1); break; case ']': { SV * const sv = GvSVn(gv); if (!sv_derived_from(PL_patchlevel, "version")) upg_version(PL_patchlevel, TRUE); GvSV(gv) = vnumify(PL_patchlevel); SvREADONLY_on(GvSV(gv)); SvREFCNT_dec(sv); } break; case '\026': /* $^V */ { SV * const sv = GvSVn(gv); GvSV(gv) = new_version(PL_patchlevel); SvREADONLY_on(GvSV(gv)); SvREFCNT_dec(sv); } break; } } return gv; } void Perl_gv_fullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain) { const char *name; STRLEN namelen; const HV * const hv = GvSTASH(gv); if (!hv) { SvOK_off(sv); return; } sv_setpv(sv, prefix ? prefix : ""); name = HvNAME_get(hv); if (name) { namelen = HvNAMELEN_get(hv); } else { name = "__ANON__"; namelen = 8; } if (keepmain || strNE(name, "main")) { sv_catpvn(sv,name,namelen); sv_catpvs(sv,"::"); } sv_catpvn(sv,GvNAME(gv),GvNAMELEN(gv)); } void Perl_gv_efullname4(pTHX_ SV *sv, const GV *gv, const char *prefix, bool keepmain) { const GV * const egv = GvEGV(gv); gv_fullname4(sv, egv ? egv : gv, prefix, keepmain); } IO * Perl_newIO(pTHX) { dVAR; GV *iogv; IO * const io = (IO*)newSV_type(SVt_PVIO); /* This used to read SvREFCNT(io) = 1; It's not clear why the reference count needed an explicit reset. NWC */ assert (SvREFCNT(io) == 1); SvOBJECT_on(io); /* Clear the stashcache because a new IO could overrule a package name */ hv_clear(PL_stashcache); iogv = gv_fetchpvs("FileHandle::", 0, SVt_PVHV); /* unless exists($main::{FileHandle}) and defined(%main::FileHandle::) */ if (!(iogv && GvHV(iogv) && HvARRAY(GvHV(iogv)))) iogv = gv_fetchpvs("IO::Handle::", GV_ADD, SVt_PVHV); SvSTASH_set(io, (HV*)SvREFCNT_inc(GvHV(iogv))); return io; } void Perl_gv_check(pTHX_ const HV *stash) { dVAR; register I32 i; if (!HvARRAY(stash)) return; for (i = 0; i <= (I32) HvMAX(stash); i++) { const HE *entry; for (entry = HvARRAY(stash)[i]; entry; entry = HeNEXT(entry)) { register GV *gv; HV *hv; if (HeKEY(entry)[HeKLEN(entry)-1] == ':' && (gv = (GV*)HeVAL(entry)) && isGV(gv) && (hv = GvHV(gv))) { if (hv != PL_defstash && hv != stash) gv_check(hv); /* nested package */ } else if (isALPHA(*HeKEY(entry))) { const char *file; gv = (GV*)HeVAL(entry); if (SvTYPE(gv) != SVt_PVGV || GvMULTI(gv)) continue; file = GvFILE(gv); CopLINE_set(PL_curcop, GvLINE(gv)); #ifdef USE_ITHREADS CopFILE(PL_curcop) = (char *)file; /* set for warning */ #else CopFILEGV(PL_curcop) = gv_fetchfile(file); #endif Perl_warner(aTHX_ packWARN(WARN_ONCE), "Name \"%s::%s\" used only once: possible typo", HvNAME_get(stash), GvNAME(gv)); } } } } GV * Perl_newGVgen(pTHX_ const char *pack) { dVAR; return gv_fetchpv(Perl_form(aTHX_ "%s::_GEN_%ld", pack, (long)PL_gensym++), GV_ADD, SVt_PVGV); } /* hopefully this is only called on local symbol table entries */ GP* Perl_gp_ref(pTHX_ GP *gp) { dVAR; if (!gp) return NULL; gp->gp_refcnt++; if (gp->gp_cv) { if (gp->gp_cvgen) { /* If the GP they asked for a reference to contains a method cache entry, clear it first, so that we don't infect them with our cached entry */ SvREFCNT_dec(gp->gp_cv); gp->gp_cv = NULL; gp->gp_cvgen = 0; } /* XXX if anyone finds a method cache regression with the "mro" stuff, turning this else block back on is probably the first place to look --blblack */ /* else { PL_sub_generation++; } */ } return gp; } void Perl_gp_free(pTHX_ GV *gv) { dVAR; GP* gp; if (!gv || !isGV_with_GP(gv) || !(gp = GvGP(gv))) return; if (gp->gp_refcnt == 0) { if (ckWARN_d(WARN_INTERNAL)) Perl_warner(aTHX_ packWARN(WARN_INTERNAL), "Attempt to free unreferenced glob pointers" pTHX__FORMAT pTHX__VALUE); return; } if (gp->gp_cv) { /* Deleting the name of a subroutine invalidates method cache */ PL_sub_generation++; } if (--gp->gp_refcnt > 0) { if (gp->gp_egv == gv) gp->gp_egv = 0; GvGP(gv) = 0; return; } if (gp->gp_file_hek) unshare_hek(gp->gp_file_hek); SvREFCNT_dec(gp->gp_sv); SvREFCNT_dec(gp->gp_av); /* FIXME - another reference loop GV -> symtab -> GV ? Somehow gp->gp_hv can end up pointing at freed garbage. */ if (gp->gp_hv && SvTYPE(gp->gp_hv) == SVt_PVHV) { const char *hvname = HvNAME_get(gp->gp_hv); if (PL_stashcache && hvname) hv_delete(PL_stashcache, hvname, HvNAMELEN_get(gp->gp_hv), G_DISCARD); SvREFCNT_dec(gp->gp_hv); } SvREFCNT_dec(gp->gp_io); SvREFCNT_dec(gp->gp_cv); SvREFCNT_dec(gp->gp_form); Safefree(gp); GvGP(gv) = 0; } int Perl_magic_freeovrld(pTHX_ SV *sv, MAGIC *mg) { AMT * const amtp = (AMT*)mg->mg_ptr; PERL_UNUSED_ARG(sv); if (amtp && AMT_AMAGIC(amtp)) { int i; for (i = 1; i < NofAMmeth; i++) { CV * const cv = amtp->table[i]; if (cv) { SvREFCNT_dec((SV *) cv); amtp->table[i] = NULL; } } } return 0; } /* Updates and caches the CV's */ bool Perl_Gv_AMupdate(pTHX_ HV *stash) { dVAR; MAGIC* const mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); AMT amt; U32 newgen; newgen = PL_sub_generation + HvMROMETA(stash)->sub_generation; if (mg) { const AMT * const amtp = (AMT*)mg->mg_ptr; if (amtp->was_ok_am == PL_amagic_generation && amtp->was_ok_sub == newgen) { return (bool)AMT_OVERLOADED(amtp); } sv_unmagic((SV*)stash, PERL_MAGIC_overload_table); } DEBUG_o( Perl_deb(aTHX_ "Recalcing overload magic in package %s\n",HvNAME_get(stash)) ); Zero(&amt,1,AMT); amt.was_ok_am = PL_amagic_generation; amt.was_ok_sub = newgen; amt.fallback = AMGfallNO; amt.flags = 0; { int filled = 0, have_ovl = 0; int i, lim = 1; /* Work with "fallback" key, which we assume to be first in PL_AMG_names */ /* Try to find via inheritance. */ GV *gv = gv_fetchmeth(stash, PL_AMG_names[0], 2, -1); SV * const sv = gv ? GvSV(gv) : NULL; CV* cv; if (!gv) lim = DESTROY_amg; /* Skip overloading entries. */ #ifdef PERL_DONT_CREATE_GVSV else if (!sv) { NOOP; /* Equivalent to !SvTRUE and !SvOK */ } #endif else if (SvTRUE(sv)) amt.fallback=AMGfallYES; else if (SvOK(sv)) amt.fallback=AMGfallNEVER; for (i = 1; i < lim; i++) amt.table[i] = NULL; for (; i < NofAMmeth; i++) { const char * const cooky = PL_AMG_names[i]; /* Human-readable form, for debugging: */ const char * const cp = (i >= DESTROY_amg ? cooky : AMG_id2name(i)); const STRLEN l = strlen(cooky); DEBUG_o( Perl_deb(aTHX_ "Checking overloading of \"%s\" in package \"%.256s\"\n", cp, HvNAME_get(stash)) ); /* don't fill the cache while looking up! Creation of inheritance stubs in intermediate packages may conflict with the logic of runtime method substitution. Indeed, for inheritance A -> B -> C, if C overloads "+0", then we could have created stubs for "(+0" in A and C too. But if B overloads "bool", we may want to use it for numifying instead of C's "+0". */ if (i >= DESTROY_amg) gv = Perl_gv_fetchmeth_autoload(aTHX_ stash, cooky, l, 0); else /* Autoload taken care of below */ gv = Perl_gv_fetchmeth(aTHX_ stash, cooky, l, -1); cv = 0; if (gv && (cv = GvCV(gv))) { const char *hvname; if (GvNAMELEN(CvGV(cv)) == 3 && strEQ(GvNAME(CvGV(cv)), "nil") && strEQ(hvname = HvNAME_get(GvSTASH(CvGV(cv))), "overload")) { /* This is a hack to support autoloading..., while knowing *which* methods were declared as overloaded. */ /* GvSV contains the name of the method. */ GV *ngv = NULL; SV *gvsv = GvSV(gv); DEBUG_o( Perl_deb(aTHX_ "Resolving method \"%"SVf256\ "\" for overloaded \"%s\" in package \"%.256s\"\n", (void*)GvSV(gv), cp, hvname) ); if (!gvsv || !SvPOK(gvsv) || !(ngv = gv_fetchmethod_autoload(stash, SvPVX_const(gvsv), FALSE))) { /* Can be an import stub (created by "can"). */ const char * const name = (gvsv && SvPOK(gvsv)) ? SvPVX_const(gvsv) : "???"; Perl_croak(aTHX_ "%s method \"%.256s\" overloading \"%s\" "\ "in package \"%.256s\"", (GvCVGEN(gv) ? "Stub found while resolving" : "Can't resolve"), name, cp, hvname); } cv = GvCV(gv = ngv); } DEBUG_o( Perl_deb(aTHX_ "Overloading \"%s\" in package \"%.256s\" via \"%.256s::%.256s\"\n", cp, HvNAME_get(stash), HvNAME_get(GvSTASH(CvGV(cv))), GvNAME(CvGV(cv))) ); filled = 1; if (i < DESTROY_amg) have_ovl = 1; } else if (gv) { /* Autoloaded... */ cv = (CV*)gv; filled = 1; } amt.table[i]=(CV*)SvREFCNT_inc_simple(cv); } if (filled) { AMT_AMAGIC_on(&amt); if (have_ovl) AMT_OVERLOADED_on(&amt); sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table, (char*)&amt, sizeof(AMT)); return have_ovl; } } /* Here we have no table: */ /* no_table: */ AMT_AMAGIC_off(&amt); sv_magic((SV*)stash, 0, PERL_MAGIC_overload_table, (char*)&amt, sizeof(AMTS)); return FALSE; } CV* Perl_gv_handler(pTHX_ HV *stash, I32 id) { dVAR; MAGIC *mg; AMT *amtp; U32 newgen; if (!stash || !HvNAME_get(stash)) return NULL; newgen = PL_sub_generation + HvMROMETA(stash)->sub_generation; mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); if (!mg) { do_update: Gv_AMupdate(stash); mg = mg_find((SV*)stash, PERL_MAGIC_overload_table); } assert(mg); amtp = (AMT*)mg->mg_ptr; if ( amtp->was_ok_am != PL_amagic_generation || amtp->was_ok_sub != newgen ) goto do_update; if (AMT_AMAGIC(amtp)) { CV * const ret = amtp->table[id]; if (ret && isGV(ret)) { /* Autoloading stab */ /* Passing it through may have resulted in a warning "Inherited AUTOLOAD for a non-method deprecated", since our caller is going through a function call, not a method call. So return the CV for AUTOLOAD, setting $AUTOLOAD. */ GV * const gv = gv_fetchmethod(stash, PL_AMG_names[id]); if (gv && GvCV(gv)) return GvCV(gv); } return ret; } return NULL; } SV* Perl_amagic_call(pTHX_ SV *left, SV *right, int method, int flags) { dVAR; MAGIC *mg; CV *cv=NULL; CV **cvp=NULL, **ocvp=NULL; AMT *amtp=NULL, *oamtp=NULL; int off = 0, off1, lr = 0, notfound = 0; int postpr = 0, force_cpy = 0; int assign = AMGf_assign & flags; const int assignshift = assign ? 1 : 0; #ifdef DEBUGGING int fl=0; #endif HV* stash=NULL; if (!(AMGf_noleft & flags) && SvAMAGIC(left) && (stash = SvSTASH(SvRV(left))) && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table)) && (ocvp = cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) ? (oamtp = amtp = (AMT*)mg->mg_ptr)->table : NULL)) && ((cv = cvp[off=method+assignshift]) || (assign && amtp->fallback > AMGfallNEVER && /* fallback to * usual method */ ( #ifdef DEBUGGING fl = 1, #endif cv = cvp[off=method])))) { lr = -1; /* Call method for left argument */ } else { if (cvp && amtp->fallback > AMGfallNEVER && flags & AMGf_unary) { int logic; /* look for substituted methods */ /* In all the covered cases we should be called with assign==0. */ switch (method) { case inc_amg: force_cpy = 1; if ((cv = cvp[off=add_ass_amg]) || ((cv = cvp[off = add_amg]) && (force_cpy = 0, postpr = 1))) { right = &PL_sv_yes; lr = -1; assign = 1; } break; case dec_amg: force_cpy = 1; if ((cv = cvp[off = subtr_ass_amg]) || ((cv = cvp[off = subtr_amg]) && (force_cpy = 0, postpr=1))) { right = &PL_sv_yes; lr = -1; assign = 1; } break; case bool__amg: (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg])); break; case numer_amg: (void)((cv = cvp[off=string_amg]) || (cv = cvp[off=bool__amg])); break; case string_amg: (void)((cv = cvp[off=numer_amg]) || (cv = cvp[off=bool__amg])); break; case not_amg: (void)((cv = cvp[off=bool__amg]) || (cv = cvp[off=numer_amg]) || (cv = cvp[off=string_amg])); postpr = 1; break; case copy_amg: { /* * SV* ref causes confusion with the interpreter variable of * the same name */ SV* const tmpRef=SvRV(left); if (!SvROK(tmpRef) && SvTYPE(tmpRef) <= SVt_PVMG) { /* * Just to be extra cautious. Maybe in some * additional cases sv_setsv is safe, too. */ SV* const newref = newSVsv(tmpRef); SvOBJECT_on(newref); /* As a bit of a source compatibility hack, SvAMAGIC() and friends dereference an RV, to behave the same was as when overloading was stored on the reference, not the referant. Hence we can't use SvAMAGIC_on() */ SvFLAGS(newref) |= SVf_AMAGIC; SvSTASH_set(newref, (HV*)SvREFCNT_inc(SvSTASH(tmpRef))); return newref; } } break; case abs_amg: if ((cvp[off1=lt_amg] || cvp[off1=ncmp_amg]) && ((cv = cvp[off=neg_amg]) || (cv = cvp[off=subtr_amg]))) { SV* const nullsv=sv_2mortal(newSViv(0)); if (off1==lt_amg) { SV* const lessp = amagic_call(left,nullsv, lt_amg,AMGf_noright); logic = SvTRUE(lessp); } else { SV* const lessp = amagic_call(left,nullsv, ncmp_amg,AMGf_noright); logic = (SvNV(lessp) < 0); } if (logic) { if (off==subtr_amg) { right = left; left = nullsv; lr = 1; } } else { return left; } } break; case neg_amg: if ((cv = cvp[off=subtr_amg])) { right = left; left = sv_2mortal(newSViv(0)); lr = 1; } break; case int_amg: case iter_amg: /* XXXX Eventually should do to_gv. */ /* FAIL safe */ return NULL; /* Delegate operation to standard mechanisms. */ break; case to_sv_amg: case to_av_amg: case to_hv_amg: case to_gv_amg: case to_cv_amg: /* FAIL safe */ return left; /* Delegate operation to standard mechanisms. */ break; default: goto not_found; } if (!cv) goto not_found; } else if (!(AMGf_noright & flags) && SvAMAGIC(right) && (stash = SvSTASH(SvRV(right))) && (mg = mg_find((SV*)stash, PERL_MAGIC_overload_table)) && (cvp = (AMT_AMAGIC((AMT*)mg->mg_ptr) ? (amtp = (AMT*)mg->mg_ptr)->table : NULL)) && (cv = cvp[off=method])) { /* Method for right * argument found */ lr=1; } else if (((ocvp && oamtp->fallback > AMGfallNEVER && (cvp=ocvp) && (lr = -1)) || (cvp && amtp->fallback > AMGfallNEVER && (lr=1))) && !(flags & AMGf_unary)) { /* We look for substitution for * comparison operations and * concatenation */ if (method==concat_amg || method==concat_ass_amg || method==repeat_amg || method==repeat_ass_amg) { return NULL; /* Delegate operation to string conversion */ } off = -1; switch (method) { case lt_amg: case le_amg: case gt_amg: case ge_amg: case eq_amg: case ne_amg: postpr = 1; off=ncmp_amg; break; case slt_amg: case sle_amg: case sgt_amg: case sge_amg: case seq_amg: case sne_amg: postpr = 1; off=scmp_amg; break; } if (off != -1) cv = cvp[off]; if (!cv) { goto not_found; } } else { not_found: /* No method found, either report or croak */ switch (method) { case lt_amg: case le_amg: case gt_amg: case ge_amg: case eq_amg: case ne_amg: case slt_amg: case sle_amg: case sgt_amg: case sge_amg: case seq_amg: case sne_amg: postpr = 0; break; case to_sv_amg: case to_av_amg: case to_hv_amg: case to_gv_amg: case to_cv_amg: /* FAIL safe */ return left; /* Delegate operation to standard mechanisms. */ break; } if (ocvp && (cv=ocvp[nomethod_amg])) { /* Call report method */ notfound = 1; lr = -1; } else if (cvp && (cv=cvp[nomethod_amg])) { notfound = 1; lr = 1; } else if ((amtp && amtp->fallback >= AMGfallYES) && !DEBUG_o_TEST) { /* Skip generating the "no method found" message. */ return NULL; } else { SV *msg; if (off==-1) off=method; msg = sv_2mortal(Perl_newSVpvf(aTHX_ "Operation \"%s\": no method found,%sargument %s%s%s%s", AMG_id2name(method + assignshift), (flags & AMGf_unary ? " " : "\n\tleft "), SvAMAGIC(left)? "in overloaded package ": "has no overloaded magic", SvAMAGIC(left)? HvNAME_get(SvSTASH(SvRV(left))): "", SvAMAGIC(right)? ",\n\tright argument in overloaded package ": (flags & AMGf_unary ? "" : ",\n\tright argument has no overloaded magic"), SvAMAGIC(right)? HvNAME_get(SvSTASH(SvRV(right))): "")); if (amtp && amtp->fallback >= AMGfallYES) { DEBUG_o( Perl_deb(aTHX_ "%s", SvPVX_const(msg)) ); } else { Perl_croak(aTHX_ "%"SVf, SVfARG(msg)); } return NULL; } force_cpy = force_cpy || assign; } } #ifdef DEBUGGING if (!notfound) { DEBUG_o(Perl_deb(aTHX_ "Overloaded operator \"%s\"%s%s%s:\n\tmethod%s found%s in package %s%s\n", AMG_id2name(off), method+assignshift==off? "" : " (initially \"", method+assignshift==off? "" : AMG_id2name(method+assignshift), method+assignshift==off? "" : "\")", flags & AMGf_unary? "" : lr==1 ? " for right argument": " for left argument", flags & AMGf_unary? " for argument" : "", stash ? HvNAME_get(stash) : "null", fl? ",\n\tassignment variant used": "") ); } #endif /* Since we use shallow copy during assignment, we need * to dublicate the contents, probably calling user-supplied * version of copy operator */ /* We need to copy in following cases: * a) Assignment form was called. * assignshift==1, assign==T, method + 1 == off * b) Increment or decrement, called directly. * assignshift==0, assign==0, method + 0 == off * c) Increment or decrement, translated to assignment add/subtr. * assignshift==0, assign==T, * force_cpy == T * d) Increment or decrement, translated to nomethod. * assignshift==0, assign==0, * force_cpy == T * e) Assignment form translated to nomethod. * assignshift==1, assign==T, method + 1 != off * force_cpy == T */ /* off is method, method+assignshift, or a result of opcode substitution. * In the latter case assignshift==0, so only notfound case is important. */ if (( (method + assignshift == off) && (assign || (method == inc_amg) || (method == dec_amg))) || force_cpy) RvDEEPCP(left); { dSP; BINOP myop; SV* res; const bool oldcatch = CATCH_GET; CATCH_SET(TRUE); Zero(&myop, 1, BINOP); myop.op_last = (OP *) &myop; myop.op_next = NULL; myop.op_flags = OPf_WANT_SCALAR | OPf_STACKED; PUSHSTACKi(PERLSI_OVERLOAD); ENTER; SAVEOP(); PL_op = (OP *) &myop; if (PERLDB_SUB && PL_curstash != PL_debstash) PL_op->op_private |= OPpENTERSUB_DB; PUTBACK; pp_pushmark(); EXTEND(SP, notfound + 5); PUSHs(lr>0? right: left); PUSHs(lr>0? left: right); PUSHs( lr > 0 ? &PL_sv_yes : ( assign ? &PL_sv_undef : &PL_sv_no )); if (notfound) { PUSHs( sv_2mortal(newSVpv(AMG_id2name(method + assignshift),0))); } PUSHs((SV*)cv); PUTBACK; if ((PL_op = Perl_pp_entersub(aTHX))) CALLRUNOPS(aTHX); LEAVE; SPAGAIN; res=POPs; PUTBACK; POPSTACK; CATCH_SET(oldcatch); if (postpr) { int ans; switch (method) { case le_amg: case sle_amg: ans=SvIV(res)<=0; break; case lt_amg: case slt_amg: ans=SvIV(res)<0; break; case ge_amg: case sge_amg: ans=SvIV(res)>=0; break; case gt_amg: case sgt_amg: ans=SvIV(res)>0; break; case eq_amg: case seq_amg: ans=SvIV(res)==0; break; case ne_amg: case sne_amg: ans=SvIV(res)!=0; break; case inc_amg: case dec_amg: SvSetSV(left,res); return left; case not_amg: ans=!SvTRUE(res); break; default: ans=0; break; } return boolSV(ans); } else if (method==copy_amg) { if (!SvROK(res)) { Perl_croak(aTHX_ "Copy method did not return a reference"); } return SvREFCNT_inc(SvRV(res)); } else { return res; } } } /* =for apidoc is_gv_magical_sv Returns C if given the name of a magical GV. Calls is_gv_magical. =cut */ bool Perl_is_gv_magical_sv(pTHX_ SV *name, U32 flags) { STRLEN len; const char * const temp = SvPV_const(name, len); return is_gv_magical(temp, len, flags); } /* =for apidoc is_gv_magical Returns C if given the name of a magical GV. Currently only useful internally when determining if a GV should be created even in rvalue contexts. C is not used at present but available for future extension to allow selecting particular classes of magical variable. Currently assumes that C is NUL terminated (as well as len being valid). This assumption is met by all callers within the perl core, which all pass pointers returned by SvPV. =cut */ bool Perl_is_gv_magical(pTHX_ const char *name, STRLEN len, U32 flags) { PERL_UNUSED_CONTEXT; PERL_UNUSED_ARG(flags); if (len > 1) { const char * const name1 = name + 1; switch (*name) { case 'I': if (len == 3 && name1[1] == 'S' && name[2] == 'A') goto yes; break; case 'O': if (len == 8 && strEQ(name1, "VERLOAD")) goto yes; break; case 'S': if (len == 3 && name[1] == 'I' && name[2] == 'G') goto yes; break; /* Using ${^...} variables is likely to be sufficiently rare that it seems sensible to avoid the space hit of also checking the length. */ case '\017': /* ${^OPEN} */ if (strEQ(name1, "PEN")) goto yes; break; case '\024': /* ${^TAINT} */ if (strEQ(name1, "AINT")) goto yes; break; case '\025': /* ${^UNICODE} */ if (strEQ(name1, "NICODE")) goto yes; if (strEQ(name1, "TF8LOCALE")) goto yes; break; case '\027': /* ${^WARNING_BITS} */ if (strEQ(name1, "ARNING_BITS")) goto yes; break; case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': { const char *end = name + len; while (--end > name) { if (!isDIGIT(*end)) return FALSE; } goto yes; } } } else { /* Because we're already assuming that name is NUL terminated below, we can treat an empty name as "\0" */ switch (*name) { case '&': case '`': case '\'': case ':': case '?': case '!': case '-': case '#': case '[': case '^': case '~': case '=': case '%': case '.': case '(': case ')': case '<': case '>': case ',': case '\\': case '/': case '|': case '+': case ';': case ']': case '\001': /* $^A */ case '\003': /* $^C */ case '\004': /* $^D */ case '\005': /* $^E */ case '\006': /* $^F */ case '\010': /* $^H */ case '\011': /* $^I, NOT \t in EBCDIC */ case '\014': /* $^L */ case '\016': /* $^N */ case '\017': /* $^O */ case '\020': /* $^P */ case '\023': /* $^S */ case '\024': /* $^T */ case '\026': /* $^V */ case '\027': /* $^W */ case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': yes: return TRUE; default: break; } } return FALSE; } void Perl_gv_name_set(pTHX_ GV *gv, const char *name, U32 len, U32 flags) { dVAR; U32 hash; assert(name); PERL_UNUSED_ARG(flags); if (len > I32_MAX) Perl_croak(aTHX_ "panic: gv name too long (%"UVuf")", (UV) len); if (!(flags & GV_ADD) && GvNAME_HEK(gv)) { unshare_hek(GvNAME_HEK(gv)); } PERL_HASH(hash, name, len); GvNAME_HEK(gv) = share_hek(name, len, hash); } /* * Local variables: * c-indentation-style: bsd * c-basic-offset: 4 * indent-tabs-mode: t * End: * * ex: set ts=8 sts=4 sw=4 noet: */