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1 | #include "EXTERN.h" |
864dbfa3 |
2 | #define PERL_IN_UNIVERSAL_C |
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3 | #include "perl.h" |
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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 | |
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10 | STATIC SV * |
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11 | S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level) |
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12 | { |
13 | AV* av; |
14 | GV* gv; |
15 | GV** gvp; |
16 | HV* hv = Nullhv; |
17 | |
18 | if (!stash) |
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19 | return &PL_sv_undef; |
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20 | |
21 | if(strEQ(HvNAME(stash), name)) |
3280af22 |
22 | return &PL_sv_yes; |
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23 | |
24 | if (level > 100) |
cea2e8a9 |
25 | Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash)); |
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26 | |
27 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); |
28 | |
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29 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) { |
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30 | SV* sv; |
31 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); |
3280af22 |
32 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) |
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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 |
51 | /* NOTE: No support for tied ISA */ |
52 | I32 items = AvFILLp(av) + 1; |
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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)) |
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59 | Perl_warner(aTHX_ WARN_SYNTAX, |
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60 | "Can't locate package %s for @%s::ISA", |
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61 | SvPVX(sv), HvNAME(stash)); |
62 | continue; |
63 | } |
3280af22 |
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; |
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67 | } |
68 | } |
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69 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
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70 | } |
71 | } |
72 | |
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73 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 |
74 | } |
75 | |
954c1994 |
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 | |
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86 | bool |
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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) |
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111 | ? TRUE |
112 | : FALSE ; |
113 | |
114 | } |
115 | |
0cb96387 |
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 | |
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130 | #include "XSUB.h" |
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131 | |
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132 | XS(XS_UNIVERSAL_isa) |
133 | { |
134 | dXSARGS; |
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135 | SV *sv; |
136 | char *name; |
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137 | STRLEN n_a; |
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138 | |
139 | if (items != 2) |
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140 | Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)"); |
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141 | |
142 | sv = ST(0); |
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143 | name = (char *)SvPV(ST(1),n_a); |
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144 | |
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145 | ST(0) = boolSV(sv_derived_from(sv, name)); |
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146 | XSRETURN(1); |
147 | } |
148 | |
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149 | XS(XS_UNIVERSAL_can) |
150 | { |
151 | dXSARGS; |
152 | SV *sv; |
153 | char *name; |
154 | SV *rv; |
6f08146e |
155 | HV *pkg = NULL; |
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156 | STRLEN n_a; |
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157 | |
158 | if (items != 2) |
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159 | Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)"); |
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160 | |
161 | sv = ST(0); |
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162 | name = (char *)SvPV(ST(1),n_a); |
3280af22 |
163 | rv = &PL_sv_undef; |
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164 | |
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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))); |
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178 | } |
179 | |
180 | ST(0) = rv; |
181 | XSRETURN(1); |
182 | } |
183 | |
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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; |
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193 | |
194 | if(SvROK(ST(0))) { |
195 | sv = (SV*)SvRV(ST(0)); |
196 | if(!SvOBJECT(sv)) |
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197 | Perl_croak(aTHX_ "Cannot find version of an unblessed reference"); |
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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 | |
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206 | if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) { |
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207 | SV *nsv = sv_newmortal(); |
208 | sv_setsv(nsv, sv); |
209 | sv = nsv; |
210 | undef = Nullch; |
211 | } |
212 | else { |
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213 | sv = (SV*)&PL_sv_undef; |
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214 | undef = "(undef)"; |
215 | } |
216 | |
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217 | if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) { |
218 | STRLEN n_a; |
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219 | Perl_croak(aTHX_ "%s version %s required--this is only version %s", |
2d8e6c8d |
220 | HvNAME(pkg), SvPV(ST(1),n_a), undef ? undef : SvPV(sv,n_a)); |
221 | } |
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222 | |
223 | ST(0) = sv; |
224 | |
225 | XSRETURN(1); |
226 | } |
227 | |