Commit | Line | Data |
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6d4a7be2 | 1 | #include "EXTERN.h" |
864dbfa3 | 2 | #define PERL_IN_UNIVERSAL_C |
6d4a7be2 | 3 | #include "perl.h" |
6d4a7be2 | 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 | ||
76e3520e | 10 | STATIC SV * |
cea2e8a9 | 11 | S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level) |
6d4a7be2 | 12 | { |
13 | AV* av; | |
14 | GV* gv; | |
15 | GV** gvp; | |
16 | HV* hv = Nullhv; | |
17 | ||
18 | if (!stash) | |
3280af22 | 19 | return &PL_sv_undef; |
6d4a7be2 | 20 | |
21 | if(strEQ(HvNAME(stash), name)) | |
3280af22 | 22 | return &PL_sv_yes; |
6d4a7be2 | 23 | |
24 | if (level > 100) | |
cea2e8a9 | 25 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash)); |
6d4a7be2 | 26 | |
27 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); | |
28 | ||
3280af22 | 29 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) { |
6d4a7be2 | 30 | SV* sv; |
31 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); | |
3280af22 | 32 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) |
6d4a7be2 | 33 | return sv; |
34 | } | |
35 | ||
36 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); | |
37 | ||
3280af22 | 38 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
6d4a7be2 | 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); | |
93965878 NIS |
51 | /* NOTE: No support for tied ISA */ |
52 | I32 items = AvFILLp(av) + 1; | |
6d4a7be2 | 53 | while (items--) { |
54 | SV* sv = *svp++; | |
55 | HV* basestash = gv_stashsv(sv, FALSE); | |
56 | if (!basestash) { | |
d008e5eb | 57 | dTHR; |
599cee73 | 58 | if (ckWARN(WARN_MISC)) |
cea2e8a9 | 59 | Perl_warner(aTHX_ WARN_SYNTAX, |
599cee73 | 60 | "Can't locate package %s for @%s::ISA", |
6d4a7be2 | 61 | SvPVX(sv), HvNAME(stash)); |
62 | continue; | |
63 | } | |
3280af22 NIS |
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; | |
6d4a7be2 | 67 | } |
68 | } | |
3280af22 | 69 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
6d4a7be2 | 70 | } |
71 | } | |
72 | ||
e09f3e01 | 73 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 | 74 | } |
75 | ||
954c1994 GS |
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 | ||
55497cff | 86 | bool |
864dbfa3 | 87 | Perl_sv_derived_from(pTHX_ SV *sv, const char *name) |
55497cff | 88 | { |
89 | SV *rv; | |
90 | char *type; | |
91 | HV *stash; | |
92 | ||
93 | stash = Nullhv; | |
94 | type = Nullch; | |
95 | ||
96 | if (SvGMAGICAL(sv)) | |
97 | mg_get(sv) ; | |
98 | ||
99 | if (SvROK(sv)) { | |
100 | sv = SvRV(sv); | |
101 | type = sv_reftype(sv,0); | |
102 | if(SvOBJECT(sv)) | |
103 | stash = SvSTASH(sv); | |
104 | } | |
105 | else { | |
106 | stash = gv_stashsv(sv, FALSE); | |
107 | } | |
108 | ||
109 | return (type && strEQ(type,name)) || | |
3280af22 | 110 | (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes) |
55497cff | 111 | ? TRUE |
112 | : FALSE ; | |
113 | ||
114 | } | |
115 | ||
0cb96387 GS |
116 | void XS_UNIVERSAL_isa(pTHXo_ CV *cv); |
117 | void XS_UNIVERSAL_can(pTHXo_ CV *cv); | |
118 | void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv); | |
119 | ||
120 | void | |
121 | Perl_boot_core_UNIVERSAL(pTHX) | |
122 | { | |
123 | char *file = __FILE__; | |
124 | ||
125 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); | |
126 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); | |
127 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); | |
128 | } | |
129 | ||
76e3520e | 130 | #include "XSUB.h" |
55497cff | 131 | |
6d4a7be2 | 132 | XS(XS_UNIVERSAL_isa) |
133 | { | |
134 | dXSARGS; | |
55497cff | 135 | SV *sv; |
136 | char *name; | |
2d8e6c8d | 137 | STRLEN n_a; |
6d4a7be2 | 138 | |
139 | if (items != 2) | |
cea2e8a9 | 140 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
6d4a7be2 | 141 | |
142 | sv = ST(0); | |
2d8e6c8d | 143 | name = (char *)SvPV(ST(1),n_a); |
6d4a7be2 | 144 | |
54310121 | 145 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 146 | XSRETURN(1); |
147 | } | |
148 | ||
6d4a7be2 | 149 | XS(XS_UNIVERSAL_can) |
150 | { | |
151 | dXSARGS; | |
152 | SV *sv; | |
153 | char *name; | |
154 | SV *rv; | |
6f08146e | 155 | HV *pkg = NULL; |
2d8e6c8d | 156 | STRLEN n_a; |
6d4a7be2 | 157 | |
158 | if (items != 2) | |
cea2e8a9 | 159 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
6d4a7be2 | 160 | |
161 | sv = ST(0); | |
2d8e6c8d | 162 | name = (char *)SvPV(ST(1),n_a); |
3280af22 | 163 | rv = &PL_sv_undef; |
6d4a7be2 | 164 | |
6f08146e NIS |
165 | if(SvROK(sv)) { |
166 | sv = (SV*)SvRV(sv); | |
167 | if(SvOBJECT(sv)) | |
168 | pkg = SvSTASH(sv); | |
169 | } | |
170 | else { | |
171 | pkg = gv_stashsv(sv, FALSE); | |
172 | } | |
173 | ||
174 | if (pkg) { | |
dc848c6f | 175 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
176 | if (gv && isGV(gv)) | |
177 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 178 | } |
179 | ||
180 | ST(0) = rv; | |
181 | XSRETURN(1); | |
182 | } | |
183 | ||
6d4a7be2 | 184 | XS(XS_UNIVERSAL_VERSION) |
185 | { | |
186 | dXSARGS; | |
187 | HV *pkg; | |
188 | GV **gvp; | |
189 | GV *gv; | |
190 | SV *sv; | |
191 | char *undef; | |
cad2e5aa | 192 | NV req; |
6d4a7be2 | 193 | |
194 | if(SvROK(ST(0))) { | |
195 | sv = (SV*)SvRV(ST(0)); | |
196 | if(!SvOBJECT(sv)) | |
cea2e8a9 | 197 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
6d4a7be2 | 198 | pkg = SvSTASH(sv); |
199 | } | |
200 | else { | |
201 | pkg = gv_stashsv(ST(0), FALSE); | |
202 | } | |
203 | ||
204 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
205 | ||
d4bea2fb | 206 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
6d4a7be2 | 207 | SV *nsv = sv_newmortal(); |
208 | sv_setsv(nsv, sv); | |
209 | sv = nsv; | |
210 | undef = Nullch; | |
211 | } | |
212 | else { | |
3280af22 | 213 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 | 214 | undef = "(undef)"; |
215 | } | |
216 | ||
2d8e6c8d GS |
217 | if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) { |
218 | STRLEN n_a; | |
cea2e8a9 | 219 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
2d8e6c8d GS |
220 | HvNAME(pkg), SvPV(ST(1),n_a), undef ? undef : SvPV(sv,n_a)); |
221 | } | |
6d4a7be2 | 222 | |
223 | ST(0) = sv; | |
224 | ||
225 | XSRETURN(1); | |
226 | } | |
227 |