| 1 | /* xsutils.c |
| 2 | * |
| 3 | * Copyright (C) 1999, 2000, 2001, 2002, 2003, by Larry Wall and others |
| 4 | * |
| 5 | * You may distribute under the terms of either the GNU General Public |
| 6 | * License or the Artistic License, as specified in the README file. |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * "Perilous to us all are the devices of an art deeper than we possess |
| 12 | * ourselves." --Gandalf |
| 13 | */ |
| 14 | |
| 15 | |
| 16 | #include "EXTERN.h" |
| 17 | #define PERL_IN_XSUTILS_C |
| 18 | #include "perl.h" |
| 19 | |
| 20 | /* |
| 21 | * Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us). |
| 22 | */ |
| 23 | |
| 24 | /* package attributes; */ |
| 25 | void XS_attributes__warn_reserved(pTHX_ CV *cv); |
| 26 | void XS_attributes_reftype(pTHX_ CV *cv); |
| 27 | void XS_attributes__modify_attrs(pTHX_ CV *cv); |
| 28 | void XS_attributes__guess_stash(pTHX_ CV *cv); |
| 29 | void XS_attributes__fetch_attrs(pTHX_ CV *cv); |
| 30 | void XS_attributes_bootstrap(pTHX_ CV *cv); |
| 31 | |
| 32 | |
| 33 | /* |
| 34 | * Note that only ${pkg}::bootstrap definitions should go here. |
| 35 | * This helps keep down the start-up time, which is especially |
| 36 | * relevant for users who don't invoke any features which are |
| 37 | * (partially) implemented here. |
| 38 | * |
| 39 | * The various bootstrap definitions can take care of doing |
| 40 | * package-specific newXS() calls. Since the layout of the |
| 41 | * bundled *.pm files is in a version-specific directory, |
| 42 | * version checks in these bootstrap calls are optional. |
| 43 | */ |
| 44 | |
| 45 | void |
| 46 | Perl_boot_core_xsutils(pTHX) |
| 47 | { |
| 48 | char *file = __FILE__; |
| 49 | |
| 50 | newXS("attributes::bootstrap", XS_attributes_bootstrap, file); |
| 51 | } |
| 52 | |
| 53 | #include "XSUB.h" |
| 54 | |
| 55 | static int |
| 56 | modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs) |
| 57 | { |
| 58 | SV *attr; |
| 59 | char *name; |
| 60 | STRLEN len; |
| 61 | bool negated; |
| 62 | int nret; |
| 63 | |
| 64 | for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) { |
| 65 | name = SvPV(attr, len); |
| 66 | if ((negated = (*name == '-'))) { |
| 67 | name++; |
| 68 | len--; |
| 69 | } |
| 70 | switch (SvTYPE(sv)) { |
| 71 | case SVt_PVCV: |
| 72 | switch ((int)len) { |
| 73 | case 6: |
| 74 | switch (*name) { |
| 75 | case 'a': |
| 76 | if (strEQ(name, "assertion")) { |
| 77 | if (negated) |
| 78 | CvFLAGS((CV*)sv) &= ~CVf_ASSERTION; |
| 79 | else |
| 80 | CvFLAGS((CV*)sv) |= CVf_ASSERTION; |
| 81 | continue; |
| 82 | } |
| 83 | break; |
| 84 | case 'l': |
| 85 | #ifdef CVf_LVALUE |
| 86 | if (strEQ(name, "lvalue")) { |
| 87 | if (negated) |
| 88 | CvFLAGS((CV*)sv) &= ~CVf_LVALUE; |
| 89 | else |
| 90 | CvFLAGS((CV*)sv) |= CVf_LVALUE; |
| 91 | continue; |
| 92 | } |
| 93 | #endif /* defined CVf_LVALUE */ |
| 94 | if (strEQ(name, "locked")) { |
| 95 | if (negated) |
| 96 | CvFLAGS((CV*)sv) &= ~CVf_LOCKED; |
| 97 | else |
| 98 | CvFLAGS((CV*)sv) |= CVf_LOCKED; |
| 99 | continue; |
| 100 | } |
| 101 | break; |
| 102 | case 'm': |
| 103 | if (strEQ(name, "method")) { |
| 104 | if (negated) |
| 105 | CvFLAGS((CV*)sv) &= ~CVf_METHOD; |
| 106 | else |
| 107 | CvFLAGS((CV*)sv) |= CVf_METHOD; |
| 108 | continue; |
| 109 | } |
| 110 | break; |
| 111 | case 'u': |
| 112 | if (strEQ(name, "unique")) { |
| 113 | if (negated) |
| 114 | GvUNIQUE_off(CvGV((CV*)sv)); |
| 115 | else |
| 116 | GvUNIQUE_on(CvGV((CV*)sv)); |
| 117 | continue; |
| 118 | } |
| 119 | break; |
| 120 | } |
| 121 | break; |
| 122 | } |
| 123 | break; |
| 124 | default: |
| 125 | switch ((int)len) { |
| 126 | case 6: |
| 127 | switch (*name) { |
| 128 | case 's': |
| 129 | if (strEQ(name, "shared")) { |
| 130 | if (negated) |
| 131 | Perl_croak(aTHX_ "A variable may not be unshared"); |
| 132 | SvSHARE(sv); |
| 133 | continue; |
| 134 | } |
| 135 | break; |
| 136 | case 'u': |
| 137 | if (strEQ(name, "unique")) { |
| 138 | if (SvTYPE(sv) == SVt_PVGV) { |
| 139 | if (negated) |
| 140 | GvUNIQUE_off(sv); |
| 141 | else |
| 142 | GvUNIQUE_on(sv); |
| 143 | } |
| 144 | /* Hope this came from toke.c if not a GV. */ |
| 145 | continue; |
| 146 | } |
| 147 | } |
| 148 | } |
| 149 | break; |
| 150 | } |
| 151 | /* anything recognized had a 'continue' above */ |
| 152 | *retlist++ = attr; |
| 153 | nret++; |
| 154 | } |
| 155 | |
| 156 | return nret; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | |
| 161 | /* package attributes; */ |
| 162 | |
| 163 | XS(XS_attributes_bootstrap) |
| 164 | { |
| 165 | dXSARGS; |
| 166 | char *file = __FILE__; |
| 167 | |
| 168 | if( items > 1 ) |
| 169 | Perl_croak(aTHX_ "Usage: attributes::bootstrap $module"); |
| 170 | |
| 171 | newXSproto("attributes::_warn_reserved", XS_attributes__warn_reserved, file, ""); |
| 172 | newXS("attributes::_modify_attrs", XS_attributes__modify_attrs, file); |
| 173 | newXSproto("attributes::_guess_stash", XS_attributes__guess_stash, file, "$"); |
| 174 | newXSproto("attributes::_fetch_attrs", XS_attributes__fetch_attrs, file, "$"); |
| 175 | newXSproto("attributes::reftype", XS_attributes_reftype, file, "$"); |
| 176 | |
| 177 | XSRETURN(0); |
| 178 | } |
| 179 | |
| 180 | XS(XS_attributes__modify_attrs) |
| 181 | { |
| 182 | dXSARGS; |
| 183 | SV *rv, *sv; |
| 184 | |
| 185 | if (items < 1) { |
| 186 | usage: |
| 187 | Perl_croak(aTHX_ |
| 188 | "Usage: attributes::_modify_attrs $reference, @attributes"); |
| 189 | } |
| 190 | |
| 191 | rv = ST(0); |
| 192 | if (!(SvOK(rv) && SvROK(rv))) |
| 193 | goto usage; |
| 194 | sv = SvRV(rv); |
| 195 | if (items > 1) |
| 196 | XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1)); |
| 197 | |
| 198 | XSRETURN(0); |
| 199 | } |
| 200 | |
| 201 | XS(XS_attributes__fetch_attrs) |
| 202 | { |
| 203 | dXSARGS; |
| 204 | SV *rv, *sv; |
| 205 | cv_flags_t cvflags; |
| 206 | |
| 207 | if (items != 1) { |
| 208 | usage: |
| 209 | Perl_croak(aTHX_ |
| 210 | "Usage: attributes::_fetch_attrs $reference"); |
| 211 | } |
| 212 | |
| 213 | rv = ST(0); |
| 214 | SP -= items; |
| 215 | if (!(SvOK(rv) && SvROK(rv))) |
| 216 | goto usage; |
| 217 | sv = SvRV(rv); |
| 218 | |
| 219 | switch (SvTYPE(sv)) { |
| 220 | case SVt_PVCV: |
| 221 | cvflags = CvFLAGS((CV*)sv); |
| 222 | if (cvflags & CVf_LOCKED) |
| 223 | XPUSHs(sv_2mortal(newSVpvn("locked", 6))); |
| 224 | #ifdef CVf_LVALUE |
| 225 | if (cvflags & CVf_LVALUE) |
| 226 | XPUSHs(sv_2mortal(newSVpvn("lvalue", 6))); |
| 227 | #endif |
| 228 | if (cvflags & CVf_METHOD) |
| 229 | XPUSHs(sv_2mortal(newSVpvn("method", 6))); |
| 230 | if (GvUNIQUE(CvGV((CV*)sv))) |
| 231 | XPUSHs(sv_2mortal(newSVpvn("unique", 6))); |
| 232 | if (cvflags & CVf_ASSERTION) |
| 233 | XPUSHs(sv_2mortal(newSVpvn("assertion", 9))); |
| 234 | break; |
| 235 | case SVt_PVGV: |
| 236 | if (GvUNIQUE(sv)) |
| 237 | XPUSHs(sv_2mortal(newSVpvn("unique", 6))); |
| 238 | break; |
| 239 | default: |
| 240 | break; |
| 241 | } |
| 242 | |
| 243 | PUTBACK; |
| 244 | } |
| 245 | |
| 246 | XS(XS_attributes__guess_stash) |
| 247 | { |
| 248 | dXSARGS; |
| 249 | SV *rv, *sv; |
| 250 | #ifdef dXSTARGET |
| 251 | dXSTARGET; |
| 252 | #else |
| 253 | SV * TARG = sv_newmortal(); |
| 254 | #endif |
| 255 | |
| 256 | if (items != 1) { |
| 257 | usage: |
| 258 | Perl_croak(aTHX_ |
| 259 | "Usage: attributes::_guess_stash $reference"); |
| 260 | } |
| 261 | |
| 262 | rv = ST(0); |
| 263 | ST(0) = TARG; |
| 264 | if (!(SvOK(rv) && SvROK(rv))) |
| 265 | goto usage; |
| 266 | sv = SvRV(rv); |
| 267 | |
| 268 | if (SvOBJECT(sv)) |
| 269 | sv_setpv(TARG, HvNAME(SvSTASH(sv))); |
| 270 | #if 0 /* this was probably a bad idea */ |
| 271 | else if (SvPADMY(sv)) |
| 272 | sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */ |
| 273 | #endif |
| 274 | else { |
| 275 | HV *stash = Nullhv; |
| 276 | switch (SvTYPE(sv)) { |
| 277 | case SVt_PVCV: |
| 278 | if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv))) |
| 279 | stash = GvSTASH(CvGV(sv)); |
| 280 | else if (/* !CvANON(sv) && */ CvSTASH(sv)) |
| 281 | stash = CvSTASH(sv); |
| 282 | break; |
| 283 | case SVt_PVMG: |
| 284 | if (!(SvFAKE(sv) && SvTIED_mg(sv, PERL_MAGIC_glob))) |
| 285 | break; |
| 286 | /*FALLTHROUGH*/ |
| 287 | case SVt_PVGV: |
| 288 | if (GvGP(sv) && GvESTASH((GV*)sv)) |
| 289 | stash = GvESTASH((GV*)sv); |
| 290 | break; |
| 291 | default: |
| 292 | break; |
| 293 | } |
| 294 | if (stash) |
| 295 | sv_setpv(TARG, HvNAME(stash)); |
| 296 | } |
| 297 | |
| 298 | #ifdef dXSTARGET |
| 299 | SvSETMAGIC(TARG); |
| 300 | #endif |
| 301 | XSRETURN(1); |
| 302 | } |
| 303 | |
| 304 | XS(XS_attributes_reftype) |
| 305 | { |
| 306 | dXSARGS; |
| 307 | SV *rv, *sv; |
| 308 | #ifdef dXSTARGET |
| 309 | dXSTARGET; |
| 310 | #else |
| 311 | SV * TARG = sv_newmortal(); |
| 312 | #endif |
| 313 | |
| 314 | if (items != 1) { |
| 315 | usage: |
| 316 | Perl_croak(aTHX_ |
| 317 | "Usage: attributes::reftype $reference"); |
| 318 | } |
| 319 | |
| 320 | rv = ST(0); |
| 321 | ST(0) = TARG; |
| 322 | if (SvGMAGICAL(rv)) |
| 323 | mg_get(rv); |
| 324 | if (!(SvOK(rv) && SvROK(rv))) |
| 325 | goto usage; |
| 326 | sv = SvRV(rv); |
| 327 | sv_setpv(TARG, sv_reftype(sv, 0)); |
| 328 | #ifdef dXSTARGET |
| 329 | SvSETMAGIC(TARG); |
| 330 | #endif |
| 331 | |
| 332 | XSRETURN(1); |
| 333 | } |
| 334 | |
| 335 | XS(XS_attributes__warn_reserved) |
| 336 | { |
| 337 | dXSARGS; |
| 338 | #ifdef dXSTARGET |
| 339 | dXSTARGET; |
| 340 | #else |
| 341 | SV * TARG = sv_newmortal(); |
| 342 | #endif |
| 343 | |
| 344 | if (items != 0) { |
| 345 | Perl_croak(aTHX_ |
| 346 | "Usage: attributes::_warn_reserved ()"); |
| 347 | } |
| 348 | |
| 349 | EXTEND(SP,1); |
| 350 | ST(0) = TARG; |
| 351 | sv_setiv(TARG, ckWARN(WARN_RESERVED) != 0); |
| 352 | #ifdef dXSTARGET |
| 353 | SvSETMAGIC(TARG); |
| 354 | #endif |
| 355 | |
| 356 | XSRETURN(1); |
| 357 | } |
| 358 | |