[10723] | 1 | #include "EXTERN.h" |
---|
[14544] | 2 | #define PERL_IN_UNIVERSAL_C |
---|
[10723] | 3 | #include "perl.h" |
---|
| 4 | |
---|
| 5 | /* |
---|
| 6 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> |
---|
| 7 | * The main guts of traverse_isa was actually copied from gv_fetchmeth |
---|
| 8 | */ |
---|
| 9 | |
---|
[14544] | 10 | STATIC SV * |
---|
| 11 | S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level) |
---|
[10723] | 12 | { |
---|
| 13 | AV* av; |
---|
| 14 | GV* gv; |
---|
| 15 | GV** gvp; |
---|
| 16 | HV* hv = Nullhv; |
---|
| 17 | |
---|
| 18 | if (!stash) |
---|
[14544] | 19 | return &PL_sv_undef; |
---|
[10723] | 20 | |
---|
| 21 | if(strEQ(HvNAME(stash), name)) |
---|
[14544] | 22 | return &PL_sv_yes; |
---|
[10723] | 23 | |
---|
| 24 | if (level > 100) |
---|
[14544] | 25 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash)); |
---|
[10723] | 26 | |
---|
| 27 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); |
---|
| 28 | |
---|
[14544] | 29 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) { |
---|
[10723] | 30 | SV* sv; |
---|
| 31 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); |
---|
[14544] | 32 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) |
---|
[10723] | 33 | return sv; |
---|
| 34 | } |
---|
| 35 | |
---|
| 36 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); |
---|
| 37 | |
---|
[14544] | 38 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
---|
[10723] | 39 | if(!hv) { |
---|
| 40 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
---|
| 41 | |
---|
| 42 | gv = *gvp; |
---|
| 43 | |
---|
| 44 | if (SvTYPE(gv) != SVt_PVGV) |
---|
| 45 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); |
---|
| 46 | |
---|
| 47 | hv = GvHVn(gv); |
---|
| 48 | } |
---|
| 49 | if(hv) { |
---|
| 50 | SV** svp = AvARRAY(av); |
---|
[14544] | 51 | /* NOTE: No support for tied ISA */ |
---|
| 52 | I32 items = AvFILLp(av) + 1; |
---|
[10723] | 53 | while (items--) { |
---|
| 54 | SV* sv = *svp++; |
---|
| 55 | HV* basestash = gv_stashsv(sv, FALSE); |
---|
| 56 | if (!basestash) { |
---|
[14544] | 57 | dTHR; |
---|
| 58 | if (ckWARN(WARN_MISC)) |
---|
| 59 | Perl_warner(aTHX_ WARN_SYNTAX, |
---|
| 60 | "Can't locate package %s for @%s::ISA", |
---|
[10723] | 61 | SvPVX(sv), HvNAME(stash)); |
---|
| 62 | continue; |
---|
| 63 | } |
---|
[14544] | 64 | if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) { |
---|
| 65 | (void)hv_store(hv,name,len,&PL_sv_yes,0); |
---|
| 66 | return &PL_sv_yes; |
---|
[10723] | 67 | } |
---|
| 68 | } |
---|
[14544] | 69 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
---|
[10723] | 70 | } |
---|
| 71 | } |
---|
| 72 | |
---|
| 73 | return boolSV(strEQ(name, "UNIVERSAL")); |
---|
| 74 | } |
---|
| 75 | |
---|
[14544] | 76 | /* |
---|
| 77 | =for apidoc sv_derived_from |
---|
| 78 | |
---|
| 79 | Returns a boolean indicating whether the SV is derived from the specified |
---|
| 80 | class. This is the function that implements C<UNIVERSAL::isa>. It works |
---|
| 81 | for class names as well as for objects. |
---|
| 82 | |
---|
| 83 | =cut |
---|
| 84 | */ |
---|
| 85 | |
---|
[10723] | 86 | bool |
---|
[14544] | 87 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
---|
[10723] | 88 | { |
---|
| 89 | char *type; |
---|
| 90 | HV *stash; |
---|
| 91 | |
---|
| 92 | stash = Nullhv; |
---|
| 93 | type = Nullch; |
---|
| 94 | |
---|
| 95 | if (SvGMAGICAL(sv)) |
---|
| 96 | mg_get(sv) ; |
---|
| 97 | |
---|
| 98 | if (SvROK(sv)) { |
---|
| 99 | sv = SvRV(sv); |
---|
| 100 | type = sv_reftype(sv,0); |
---|
| 101 | if(SvOBJECT(sv)) |
---|
| 102 | stash = SvSTASH(sv); |
---|
| 103 | } |
---|
| 104 | else { |
---|
| 105 | stash = gv_stashsv(sv, FALSE); |
---|
| 106 | } |
---|
| 107 | |
---|
| 108 | return (type && strEQ(type,name)) || |
---|
[14544] | 109 | (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes) |
---|
[10723] | 110 | ? TRUE |
---|
| 111 | : FALSE ; |
---|
| 112 | } |
---|
| 113 | |
---|
[14544] | 114 | void XS_UNIVERSAL_isa(pTHXo_ CV *cv); |
---|
| 115 | void XS_UNIVERSAL_can(pTHXo_ CV *cv); |
---|
| 116 | void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv); |
---|
[10723] | 117 | |
---|
[14544] | 118 | void |
---|
| 119 | Perl_boot_core_UNIVERSAL(pTHX) |
---|
| 120 | { |
---|
| 121 | char *file = __FILE__; |
---|
| 122 | |
---|
| 123 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
---|
| 124 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
---|
| 125 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
---|
| 126 | } |
---|
| 127 | |
---|
| 128 | #include "XSUB.h" |
---|
| 129 | |
---|
[10723] | 130 | XS(XS_UNIVERSAL_isa) |
---|
| 131 | { |
---|
| 132 | dXSARGS; |
---|
| 133 | SV *sv; |
---|
| 134 | char *name; |
---|
[14544] | 135 | STRLEN n_a; |
---|
[10723] | 136 | |
---|
| 137 | if (items != 2) |
---|
[14544] | 138 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
---|
[10723] | 139 | |
---|
| 140 | sv = ST(0); |
---|
| 141 | |
---|
[14544] | 142 | if (SvGMAGICAL(sv)) |
---|
| 143 | mg_get(sv); |
---|
| 144 | |
---|
| 145 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
---|
| 146 | XSRETURN_UNDEF; |
---|
| 147 | |
---|
| 148 | name = (char *)SvPV(ST(1),n_a); |
---|
| 149 | |
---|
[10723] | 150 | ST(0) = boolSV(sv_derived_from(sv, name)); |
---|
| 151 | XSRETURN(1); |
---|
| 152 | } |
---|
| 153 | |
---|
| 154 | XS(XS_UNIVERSAL_can) |
---|
| 155 | { |
---|
| 156 | dXSARGS; |
---|
| 157 | SV *sv; |
---|
| 158 | char *name; |
---|
| 159 | SV *rv; |
---|
| 160 | HV *pkg = NULL; |
---|
[14544] | 161 | STRLEN n_a; |
---|
[10723] | 162 | |
---|
| 163 | if (items != 2) |
---|
[14544] | 164 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
---|
[10723] | 165 | |
---|
| 166 | sv = ST(0); |
---|
| 167 | |
---|
[14544] | 168 | if (SvGMAGICAL(sv)) |
---|
| 169 | mg_get(sv); |
---|
| 170 | |
---|
| 171 | if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv)))) |
---|
| 172 | XSRETURN_UNDEF; |
---|
| 173 | |
---|
| 174 | name = (char *)SvPV(ST(1),n_a); |
---|
| 175 | rv = &PL_sv_undef; |
---|
| 176 | |
---|
[10723] | 177 | if(SvROK(sv)) { |
---|
| 178 | sv = (SV*)SvRV(sv); |
---|
| 179 | if(SvOBJECT(sv)) |
---|
| 180 | pkg = SvSTASH(sv); |
---|
| 181 | } |
---|
| 182 | else { |
---|
| 183 | pkg = gv_stashsv(sv, FALSE); |
---|
| 184 | } |
---|
| 185 | |
---|
| 186 | if (pkg) { |
---|
| 187 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
---|
| 188 | if (gv && isGV(gv)) |
---|
| 189 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); |
---|
| 190 | } |
---|
| 191 | |
---|
| 192 | ST(0) = rv; |
---|
| 193 | XSRETURN(1); |
---|
| 194 | } |
---|
| 195 | |
---|
| 196 | XS(XS_UNIVERSAL_VERSION) |
---|
| 197 | { |
---|
| 198 | dXSARGS; |
---|
| 199 | HV *pkg; |
---|
| 200 | GV **gvp; |
---|
| 201 | GV *gv; |
---|
| 202 | SV *sv; |
---|
| 203 | char *undef; |
---|
| 204 | |
---|
[14544] | 205 | if (SvROK(ST(0))) { |
---|
[10723] | 206 | sv = (SV*)SvRV(ST(0)); |
---|
[14544] | 207 | if (!SvOBJECT(sv)) |
---|
| 208 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
---|
[10723] | 209 | pkg = SvSTASH(sv); |
---|
| 210 | } |
---|
| 211 | else { |
---|
| 212 | pkg = gv_stashsv(ST(0), FALSE); |
---|
| 213 | } |
---|
| 214 | |
---|
| 215 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
---|
| 216 | |
---|
[14544] | 217 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
---|
[10723] | 218 | SV *nsv = sv_newmortal(); |
---|
| 219 | sv_setsv(nsv, sv); |
---|
| 220 | sv = nsv; |
---|
| 221 | undef = Nullch; |
---|
| 222 | } |
---|
| 223 | else { |
---|
[14544] | 224 | sv = (SV*)&PL_sv_undef; |
---|
[10723] | 225 | undef = "(undef)"; |
---|
| 226 | } |
---|
| 227 | |
---|
[14544] | 228 | if (items > 1) { |
---|
| 229 | STRLEN len; |
---|
| 230 | SV *req = ST(1); |
---|
[10723] | 231 | |
---|
[14544] | 232 | if (undef) |
---|
| 233 | Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed", |
---|
| 234 | HvNAME(pkg), HvNAME(pkg)); |
---|
| 235 | |
---|
| 236 | if (!SvNIOK(sv) && SvPOK(sv)) { |
---|
| 237 | char *str = SvPVx(sv,len); |
---|
| 238 | while (len) { |
---|
| 239 | --len; |
---|
| 240 | /* XXX could DWIM "1.2.3" here */ |
---|
| 241 | if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_') |
---|
| 242 | break; |
---|
| 243 | } |
---|
| 244 | if (len) { |
---|
| 245 | if (SvNIOKp(req) && SvPOK(req)) { |
---|
| 246 | /* they said C<use Foo v1.2.3> and $Foo::VERSION |
---|
| 247 | * doesn't look like a float: do string compare */ |
---|
| 248 | if (sv_cmp(req,sv) == 1) { |
---|
| 249 | Perl_croak(aTHX_ "%s v%vd required--" |
---|
| 250 | "this is only v%vd", |
---|
| 251 | HvNAME(pkg), req, sv); |
---|
| 252 | } |
---|
| 253 | goto finish; |
---|
| 254 | } |
---|
| 255 | /* they said C<use Foo 1.002_003> and $Foo::VERSION |
---|
| 256 | * doesn't look like a float: force numeric compare */ |
---|
| 257 | (void)SvUPGRADE(sv, SVt_PVNV); |
---|
| 258 | SvNVX(sv) = str_to_version(sv); |
---|
| 259 | SvPOK_off(sv); |
---|
| 260 | SvNOK_on(sv); |
---|
| 261 | } |
---|
| 262 | } |
---|
| 263 | /* if we get here, we're looking for a numeric comparison, |
---|
| 264 | * so force the required version into a float, even if they |
---|
| 265 | * said C<use Foo v1.2.3> */ |
---|
| 266 | if (SvNIOKp(req) && SvPOK(req)) { |
---|
| 267 | NV n = SvNV(req); |
---|
| 268 | req = sv_newmortal(); |
---|
| 269 | sv_setnv(req, n); |
---|
| 270 | } |
---|
| 271 | |
---|
| 272 | if (SvNV(req) > SvNV(sv)) |
---|
| 273 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
---|
| 274 | HvNAME(pkg), SvPV(req,len), SvPV(sv,len)); |
---|
| 275 | } |
---|
| 276 | |
---|
| 277 | finish: |
---|
[10723] | 278 | ST(0) = sv; |
---|
| 279 | |
---|
| 280 | XSRETURN(1); |
---|
| 281 | } |
---|
| 282 | |
---|