xsutils.c

   1 #include "EXTERN.h"
   2 #define PERL_IN_XSUTILS_C
   3 #include "perl.h"
   4
   5 /*
   6  * Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us).
   7  */
   8
   9 /* package attributes; */
  10 void XS_attributes__warn_reserved(pTHX_ CV *cv);
  11 void XS_attributes_reftype(pTHX_ CV *cv);
  12 void XS_attributes__modify_attrs(pTHX_ CV *cv);
  13 void XS_attributes__guess_stash(pTHX_ CV *cv);
  14 void XS_attributes__fetch_attrs(pTHX_ CV *cv);
  15 void XS_attributes_bootstrap(pTHX_ CV *cv);
  16
  17
  18 /*
  19  * Note that only ${pkg}::bootstrap definitions should go here.
  20  * This helps keep down the start-up time, which is especially
  21  * relevant for users who don't invoke any features which are
  22  * (partially) implemented here.
  23  *
  24  * The various bootstrap definitions can take care of doing
  25  * package-specific newXS() calls.  Since the layout of the
  26  * bundled *.pm files is in a version-specific directory,
  27  * version checks in these bootstrap calls are optional.
  28  */
  29
  30 void
  31 Perl_boot_core_xsutils(pTHX)
  32 {
  33     char *file = __FILE__;
  34
  35     newXS("attributes::bootstrap",      XS_attributes_bootstrap,        file);
  36 }
  37
  38 #include "XSUB.h"
  39
  40 static int
  41 modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs)
  42 {
  43     SV *attr;
  44     char *name;
  45     STRLEN len;
  46     bool negated;
  47     int nret;
  48
  49     for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) {
  50         name = SvPV(attr, len);
  51         if ((negated = (*name == '-'))) {
  52             name++;
  53             len--;
  54         }
  55         switch (SvTYPE(sv)) {
  56         case SVt_PVCV:
  57             switch ((int)len) {
  58             case 6:
  59                 switch (*name) {
  60                 case 'l':
  61 #ifdef CVf_LVALUE
  62                     if (strEQ(name, "lvalue")) {
  63                         if (negated)
  64                             CvFLAGS((CV*)sv) &= ~CVf_LVALUE;
  65                         else
  66                             CvFLAGS((CV*)sv) |= CVf_LVALUE;
  67                         continue;
  68                     }
  69 #endif /* defined CVf_LVALUE */
  70                     if (strEQ(name, "locked")) {
  71                         if (negated)
  72                             CvFLAGS((CV*)sv) &= ~CVf_LOCKED;
  73                         else
  74                             CvFLAGS((CV*)sv) |= CVf_LOCKED;
  75                         continue;
  76                     }
  77                     break;
  78                 case 'm':
  79                     if (strEQ(name, "method")) {
  80                         if (negated)
  81                             CvFLAGS((CV*)sv) &= ~CVf_METHOD;
  82                         else
  83                             CvFLAGS((CV*)sv) |= CVf_METHOD;
  84                         continue;
  85                     }
  86                     break;
  87                 case 'u':
  88                     if (strEQ(name, "unique")) {
  89                         if (negated)
  90                             GvUNIQUE_off(CvGV((CV*)sv));
  91                         else
  92                             GvUNIQUE_on(CvGV((CV*)sv));
  93                         continue;
  94                     }
  95                     break;
  96                 }
  97                 break;
  98             }
  99             break;
 100         default:
 101             switch ((int)len) {
 102             case 6:
 103                 switch (*name) {
 104                 case 'u':
 105                     if (strEQ(name, "unique")) {
 106                         if (SvTYPE(sv) == SVt_PVGV) {
 107                             if (negated)
 108                                 GvUNIQUE_off(sv);
 109                             else
 110                                 GvUNIQUE_on(sv);
 111                         }
 112                         /* Hope this came from toke.c if not a GV. */
 113                         continue;
 114                     }
 115                 }
 116             }
 117             break;
 118         }
 119         /* anything recognized had a 'continue' above */
 120         *retlist++ = attr;
 121         nret++;
 122     }
 123
 124     return nret;
 125 }
 126
 127
 128
 129 /* package attributes; */
 130
 131 XS(XS_attributes_bootstrap)
 132 {
 133     dXSARGS;
 134     char *file = __FILE__;
 135
 136     if( items > 1 )
 137         Perl_croak(aTHX_ "Usage: attributes::bootstrap $module");
 138
 139     newXSproto("attributes::_warn_reserved", XS_attributes__warn_reserved, file, "");
 140     newXS("attributes::_modify_attrs",  XS_attributes__modify_attrs,    file);
 141     newXSproto("attributes::_guess_stash", XS_attributes__guess_stash, file, "$");
 142     newXSproto("attributes::_fetch_attrs", XS_attributes__fetch_attrs, file, "$");
 143     newXSproto("attributes::reftype",   XS_attributes_reftype,  file, "$");
 144
 145     XSRETURN(0);
 146 }
 147
 148 XS(XS_attributes__modify_attrs)
 149 {
 150     dXSARGS;
 151     SV *rv, *sv;
 152
 153     if (items < 1) {
 154 usage:
 155         Perl_croak(aTHX_
 156                    "Usage: attributes::_modify_attrs $reference, @attributes");
 157     }
 158
 159     rv = ST(0);
 160     if (!(SvOK(rv) && SvROK(rv)))
 161         goto usage;
 162     sv = SvRV(rv);
 163     if (items > 1)
 164         XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1));
 165
 166     XSRETURN(0);
 167 }
 168
 169 XS(XS_attributes__fetch_attrs)
 170 {
 171     dXSARGS;
 172     SV *rv, *sv;
 173     cv_flags_t cvflags;
 174
 175     if (items != 1) {
 176 usage:
 177         Perl_croak(aTHX_
 178                    "Usage: attributes::_fetch_attrs $reference");
 179     }
 180
 181     rv = ST(0);
 182     SP -= items;
 183     if (!(SvOK(rv) && SvROK(rv)))
 184         goto usage;
 185     sv = SvRV(rv);
 186
 187     switch (SvTYPE(sv)) {
 188     case SVt_PVCV:
 189         cvflags = CvFLAGS((CV*)sv);
 190         if (cvflags & CVf_LOCKED)
 191             XPUSHs(sv_2mortal(newSVpvn("locked", 6)));
 192 #ifdef CVf_LVALUE
 193         if (cvflags & CVf_LVALUE)
 194             XPUSHs(sv_2mortal(newSVpvn("lvalue", 6)));
 195 #endif
 196         if (cvflags & CVf_METHOD)
 197             XPUSHs(sv_2mortal(newSVpvn("method", 6)));
 198         if (GvUNIQUE(CvGV((CV*)sv)))
 199             XPUSHs(sv_2mortal(newSVpvn("unique", 6)));
 200         break;
 201     case SVt_PVGV:
 202         if (GvUNIQUE(sv))
 203             XPUSHs(sv_2mortal(newSVpvn("unique", 6)));
 204         break;
 205     default:
 206         break;
 207     }
 208
 209     PUTBACK;
 210 }
 211
 212 XS(XS_attributes__guess_stash)
 213 {
 214     dXSARGS;
 215     SV *rv, *sv;
 216 #ifdef dXSTARGET
 217     dXSTARGET;
 218 #else
 219     SV * TARG = sv_newmortal();
 220 #endif
 221
 222     if (items != 1) {
 223 usage:
 224         Perl_croak(aTHX_
 225                    "Usage: attributes::_guess_stash $reference");
 226     }
 227
 228     rv = ST(0);
 229     ST(0) = TARG;
 230     if (!(SvOK(rv) && SvROK(rv)))
 231         goto usage;
 232     sv = SvRV(rv);
 233
 234     if (SvOBJECT(sv))
 235         sv_setpv(TARG, HvNAME(SvSTASH(sv)));
 236 #if 0   /* this was probably a bad idea */
 237     else if (SvPADMY(sv))
 238         sv_setsv(TARG, &PL_sv_no);      /* unblessed lexical */
 239 #endif
 240     else {
 241         HV *stash = Nullhv;
 242         switch (SvTYPE(sv)) {
 243         case SVt_PVCV:
 244             if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv)))
 245                 stash = GvSTASH(CvGV(sv));
 246             else if (/* !CvANON(sv) && */ CvSTASH(sv))
 247                 stash = CvSTASH(sv);
 248             break;
 249         case SVt_PVMG:
 250             if (!(SvFAKE(sv) && SvTIED_mg(sv, PERL_MAGIC_glob)))
 251                 break;
 252             /*FALLTHROUGH*/
 253         case SVt_PVGV:
 254             if (GvGP(sv) && GvESTASH((GV*)sv))
 255                 stash = GvESTASH((GV*)sv);
 256             break;
 257         default:
 258             break;
 259         }
 260         if (stash)
 261             sv_setpv(TARG, HvNAME(stash));
 262     }
 263
 264 #ifdef dXSTARGET
 265     SvSETMAGIC(TARG);
 266 #endif
 267     XSRETURN(1);
 268 }
 269
 270 XS(XS_attributes_reftype)
 271 {
 272     dXSARGS;
 273     SV *rv, *sv;
 274 #ifdef dXSTARGET
 275     dXSTARGET;
 276 #else
 277     SV * TARG = sv_newmortal();
 278 #endif
 279
 280     if (items != 1) {
 281 usage:
 282         Perl_croak(aTHX_
 283                    "Usage: attributes::reftype $reference");
 284     }
 285
 286     rv = ST(0);
 287     ST(0) = TARG;
 288     if (SvGMAGICAL(rv))
 289         mg_get(rv);
 290     if (!(SvOK(rv) && SvROK(rv)))
 291         goto usage;
 292     sv = SvRV(rv);
 293     sv_setpv(TARG, sv_reftype(sv, 0));
 294 #ifdef dXSTARGET
 295     SvSETMAGIC(TARG);
 296 #endif
 297
 298     XSRETURN(1);
 299 }
 300
 301 XS(XS_attributes__warn_reserved)
 302 {
 303     dXSARGS;
 304 #ifdef dXSTARGET
 305     dXSTARGET;
 306 #else
 307     SV * TARG = sv_newmortal();
 308 #endif
 309
 310     if (items != 0) {
 311         Perl_croak(aTHX_
 312                    "Usage: attributes::_warn_reserved ()");
 313     }
 314
 315     EXTEND(SP,1);
 316     ST(0) = TARG;
 317     sv_setiv(TARG, ckWARN(WARN_RESERVED) != 0);
 318 #ifdef dXSTARGET
 319     SvSETMAGIC(TARG);
 320 #endif
 321
 322     XSRETURN(1);
 323 }
 324