/* xsutils.c * * Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 * 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. * */ /* * "Perilous to us all are the devices of an art deeper than we possess * ourselves." --Gandalf */ #include "EXTERN.h" #define PERL_IN_XSUTILS_C #include "perl.h" /* * Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us). */ /* package attributes; */ PERL_XS_EXPORT_C void XS_attributes_reftype(pTHX_ CV *cv); PERL_XS_EXPORT_C void XS_attributes__modify_attrs(pTHX_ CV *cv); PERL_XS_EXPORT_C void XS_attributes__guess_stash(pTHX_ CV *cv); PERL_XS_EXPORT_C void XS_attributes__fetch_attrs(pTHX_ CV *cv); PERL_XS_EXPORT_C void XS_attributes_bootstrap(pTHX_ CV *cv); /* * Note that only ${pkg}::bootstrap definitions should go here. * This helps keep down the start-up time, which is especially * relevant for users who don't invoke any features which are * (partially) implemented here. * * The various bootstrap definitions can take care of doing * package-specific newXS() calls. Since the layout of the * bundled *.pm files is in a version-specific directory, * version checks in these bootstrap calls are optional. */ static const char file[] = __FILE__; void Perl_boot_core_xsutils(pTHX) { newXS("attributes::bootstrap", XS_attributes_bootstrap, file); } #include "XSUB.h" static int modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs) { dVAR; SV *attr; int nret; for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) { STRLEN len; const char *name = SvPV_const(attr, len); const bool negated = (*name == '-'); if (negated) { name++; len--; } switch (SvTYPE(sv)) { case SVt_PVCV: switch ((int)len) { case 6: switch (name[3]) { #ifdef CVf_LVALUE case 'l': if (memEQ(name, "lvalue", 6)) { if (negated) CvFLAGS((CV*)sv) &= ~CVf_LVALUE; else CvFLAGS((CV*)sv) |= CVf_LVALUE; continue; } break; #endif case 'k': if (memEQ(name, "locked", 6)) { if (negated) CvFLAGS((CV*)sv) &= ~CVf_LOCKED; else CvFLAGS((CV*)sv) |= CVf_LOCKED; continue; } break; case 'h': if (memEQ(name, "method", 6)) { if (negated) CvFLAGS((CV*)sv) &= ~CVf_METHOD; else CvFLAGS((CV*)sv) |= CVf_METHOD; continue; } break; } break; } break; default: switch ((int)len) { case 6: switch (name[5]) { case 'd': if (memEQ(name, "share", 5)) { if (negated) Perl_croak(aTHX_ "A variable may not be unshared"); SvSHARE(sv); continue; } break; case 'e': if (memEQ(name, "uniqu", 5)) { if (isGV_with_GP(sv)) { if (negated) { GvUNIQUE_off(sv); } else { GvUNIQUE_on(sv); } } /* Hope this came from toke.c if not a GV. */ continue; } } } break; } /* anything recognized had a 'continue' above */ *retlist++ = attr; nret++; } return nret; } /* package attributes; */ XS(XS_attributes_bootstrap) { dVAR; dXSARGS; if( items > 1 ) croak_xs_usage(cv, "$module"); newXS("attributes::_modify_attrs", XS_attributes__modify_attrs, file); newXSproto("attributes::_guess_stash", XS_attributes__guess_stash, file, "$"); newXSproto("attributes::_fetch_attrs", XS_attributes__fetch_attrs, file, "$"); newXSproto("attributes::reftype", XS_attributes_reftype, file, "$"); XSRETURN(0); } XS(XS_attributes__modify_attrs) { dVAR; dXSARGS; SV *rv, *sv; if (items < 1) { usage: croak_xs_usage(cv, "@attributes"); } rv = ST(0); if (!(SvOK(rv) && SvROK(rv))) goto usage; sv = SvRV(rv); if (items > 1) XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1)); XSRETURN(0); } XS(XS_attributes__fetch_attrs) { dVAR; dXSARGS; SV *rv, *sv; cv_flags_t cvflags; if (items != 1) { usage: croak_xs_usage(cv, "$reference"); } rv = ST(0); SP -= items; if (!(SvOK(rv) && SvROK(rv))) goto usage; sv = SvRV(rv); switch (SvTYPE(sv)) { case SVt_PVCV: cvflags = CvFLAGS((CV*)sv); if (cvflags & CVf_LOCKED) XPUSHs(newSVpvs_flags("locked", SVs_TEMP)); #ifdef CVf_LVALUE if (cvflags & CVf_LVALUE) XPUSHs(newSVpvs_flags("lvalue", SVs_TEMP)); #endif if (cvflags & CVf_METHOD) XPUSHs(newSVpvs_flags("method", SVs_TEMP)); if (GvUNIQUE(CvGV((CV*)sv))) XPUSHs(newSVpvs_flags("unique", SVs_TEMP)); break; case SVt_PVGV: if (isGV_with_GP(sv) && GvUNIQUE(sv)) XPUSHs(newSVpvs_flags("unique", SVs_TEMP)); break; default: break; } PUTBACK; } XS(XS_attributes__guess_stash) { dVAR; dXSARGS; SV *rv, *sv; dXSTARG; if (items != 1) { usage: croak_xs_usage(cv, "$reference"); } rv = ST(0); ST(0) = TARG; if (!(SvOK(rv) && SvROK(rv))) goto usage; sv = SvRV(rv); if (SvOBJECT(sv)) sv_setpvn(TARG, HvNAME_get(SvSTASH(sv)), HvNAMELEN_get(SvSTASH(sv))); #if 0 /* this was probably a bad idea */ else if (SvPADMY(sv)) sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */ #endif else { const HV *stash = NULL; switch (SvTYPE(sv)) { case SVt_PVCV: if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv))) stash = GvSTASH(CvGV(sv)); else if (/* !CvANON(sv) && */ CvSTASH(sv)) stash = CvSTASH(sv); break; case SVt_PVGV: if (isGV_with_GP(sv) && GvGP(sv) && GvESTASH((GV*)sv)) stash = GvESTASH((GV*)sv); break; default: break; } if (stash) sv_setpvn(TARG, HvNAME_get(stash), HvNAMELEN_get(stash)); } SvSETMAGIC(TARG); XSRETURN(1); } XS(XS_attributes_reftype) { dVAR; dXSARGS; SV *rv, *sv; dXSTARG; if (items != 1) { usage: croak_xs_usage(cv, "$reference"); } rv = ST(0); ST(0) = TARG; SvGETMAGIC(rv); if (!(SvOK(rv) && SvROK(rv))) goto usage; sv = SvRV(rv); sv_setpv(TARG, sv_reftype(sv, 0)); SvSETMAGIC(TARG); XSRETURN(1); } /* * Local variables: * c-indentation-style: bsd * c-basic-offset: 4 * indent-tabs-mode: t * End: * * ex: set ts=8 sts=4 sw=4 noet: */