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6d4a7be2 |
1 | #include "EXTERN.h" |
2 | #include "perl.h" |
3 | #include "XSUB.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 | |
10 | static SV * |
11 | isa_lookup(stash, name, len, level) |
12 | HV *stash; |
13 | char *name; |
14 | int len; |
15 | int level; |
16 | { |
17 | AV* av; |
18 | GV* gv; |
19 | GV** gvp; |
20 | HV* hv = Nullhv; |
21 | |
22 | if (!stash) |
23 | return &sv_undef; |
24 | |
25 | if(strEQ(HvNAME(stash), name)) |
26 | return &sv_yes; |
27 | |
28 | if (level > 100) |
29 | croak("Recursive inheritance detected"); |
30 | |
31 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); |
32 | |
33 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv))) { |
34 | SV* sv; |
35 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); |
36 | if (svp && (sv = *svp) != (SV*)&sv_undef) |
37 | return sv; |
38 | } |
39 | |
40 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); |
41 | |
42 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) { |
43 | if(!hv) { |
44 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); |
45 | |
46 | gv = *gvp; |
47 | |
48 | if (SvTYPE(gv) != SVt_PVGV) |
49 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); |
50 | |
51 | hv = GvHVn(gv); |
52 | } |
53 | if(hv) { |
54 | SV** svp = AvARRAY(av); |
55 | I32 items = AvFILL(av) + 1; |
56 | while (items--) { |
57 | SV* sv = *svp++; |
58 | HV* basestash = gv_stashsv(sv, FALSE); |
59 | if (!basestash) { |
60 | if (dowarn) |
61 | warn("Can't locate package %s for @%s::ISA", |
62 | SvPVX(sv), HvNAME(stash)); |
63 | continue; |
64 | } |
65 | if(&sv_yes == isa_lookup(basestash, name, len, level + 1)) { |
66 | (void)hv_store(hv,name,len,&sv_yes,0); |
67 | return &sv_yes; |
68 | } |
69 | } |
70 | (void)hv_store(hv,name,len,&sv_no,0); |
71 | } |
72 | } |
73 | |
74 | return &sv_no; |
75 | } |
76 | |
55497cff |
77 | bool |
78 | sv_derived_from(sv, name) |
79 | SV * sv ; |
80 | char * name ; |
81 | { |
82 | SV *rv; |
83 | char *type; |
84 | HV *stash; |
85 | |
86 | stash = Nullhv; |
87 | type = Nullch; |
88 | |
89 | if (SvGMAGICAL(sv)) |
90 | mg_get(sv) ; |
91 | |
92 | if (SvROK(sv)) { |
93 | sv = SvRV(sv); |
94 | type = sv_reftype(sv,0); |
95 | if(SvOBJECT(sv)) |
96 | stash = SvSTASH(sv); |
97 | } |
98 | else { |
99 | stash = gv_stashsv(sv, FALSE); |
100 | } |
101 | |
102 | return (type && strEQ(type,name)) || |
103 | (stash && isa_lookup(stash, name, strlen(name), 0) == &sv_yes) |
104 | ? TRUE |
105 | : FALSE ; |
106 | |
107 | } |
108 | |
109 | |
6d4a7be2 |
110 | static |
111 | XS(XS_UNIVERSAL_isa) |
112 | { |
113 | dXSARGS; |
55497cff |
114 | SV *sv; |
115 | char *name; |
6d4a7be2 |
116 | |
117 | if (items != 2) |
118 | croak("Usage: UNIVERSAL::isa(reference, kind)"); |
119 | |
120 | sv = ST(0); |
121 | name = (char *)SvPV(ST(1),na); |
122 | |
55497cff |
123 | ST(0) = (sv_derived_from(sv, name) ? &sv_yes : &sv_no) ; |
760ac839 |
124 | |
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125 | XSRETURN(1); |
126 | } |
127 | |
128 | static |
129 | XS(XS_UNIVERSAL_can) |
130 | { |
131 | dXSARGS; |
132 | SV *sv; |
133 | char *name; |
134 | SV *rv; |
135 | GV *gv; |
136 | CV *cvp; |
6f08146e |
137 | HV *pkg = NULL; |
6d4a7be2 |
138 | |
139 | if (items != 2) |
140 | croak("Usage: UNIVERSAL::can(object-ref, method)"); |
141 | |
142 | sv = ST(0); |
143 | name = (char *)SvPV(ST(1),na); |
144 | rv = &sv_undef; |
145 | |
6f08146e |
146 | if(SvROK(sv)) { |
147 | sv = (SV*)SvRV(sv); |
148 | if(SvOBJECT(sv)) |
149 | pkg = SvSTASH(sv); |
150 | } |
151 | else { |
152 | pkg = gv_stashsv(sv, FALSE); |
153 | } |
154 | |
155 | if (pkg) { |
156 | gv = gv_fetchmethod(pkg, name); |
6d4a7be2 |
157 | |
158 | if(gv && GvCV(gv)) { |
159 | /* If the sub is only a stub then we may have a gv to AUTOLOAD */ |
160 | GV **gvp = (GV**)hv_fetch(GvSTASH(gv), name, strlen(name), TRUE); |
161 | if(gvp && (cvp = GvCV(*gvp))) { |
162 | rv = sv_newmortal(); |
163 | sv_setsv(rv, newRV((SV*)cvp)); |
164 | } |
165 | } |
166 | } |
167 | |
168 | ST(0) = rv; |
169 | XSRETURN(1); |
170 | } |
171 | |
172 | static |
173 | XS(XS_UNIVERSAL_is_instance) |
174 | { |
175 | dXSARGS; |
176 | ST(0) = SvROK(ST(0)) ? &sv_yes : &sv_no; |
177 | XSRETURN(1); |
178 | } |
179 | |
180 | static |
181 | XS(XS_UNIVERSAL_class) |
182 | { |
183 | dXSARGS; |
bf3f28f2 |
184 | if(SvROK(ST(0)) && SvOBJECT(SvRV(ST(0)))) { |
6d4a7be2 |
185 | SV *sv = sv_newmortal(); |
bf3f28f2 |
186 | sv_setpv(sv, HvNAME(SvSTASH(SvRV(ST(0))))); |
6d4a7be2 |
187 | ST(0) = sv; |
188 | } |
189 | XSRETURN(1); |
190 | } |
191 | |
192 | static |
193 | XS(XS_UNIVERSAL_VERSION) |
194 | { |
195 | dXSARGS; |
196 | HV *pkg; |
197 | GV **gvp; |
198 | GV *gv; |
199 | SV *sv; |
200 | char *undef; |
13826f2c |
201 | double req; |
6d4a7be2 |
202 | |
203 | if(SvROK(ST(0))) { |
204 | sv = (SV*)SvRV(ST(0)); |
205 | if(!SvOBJECT(sv)) |
206 | croak("Cannot find version of an unblessed reference"); |
207 | pkg = SvSTASH(sv); |
208 | } |
209 | else { |
210 | pkg = gv_stashsv(ST(0), FALSE); |
211 | } |
212 | |
213 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
214 | |
215 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (sv = GvSV(gv))) { |
216 | SV *nsv = sv_newmortal(); |
217 | sv_setsv(nsv, sv); |
218 | sv = nsv; |
219 | undef = Nullch; |
220 | } |
221 | else { |
222 | sv = (SV*)&sv_undef; |
223 | undef = "(undef)"; |
224 | } |
225 | |
13826f2c |
226 | if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) |
6d4a7be2 |
227 | croak("%s version %s required--this is only version %s", |
13826f2c |
228 | HvNAME(pkg), SvPV(ST(1),na), undef ? undef : SvPV(sv,na)); |
6d4a7be2 |
229 | |
230 | ST(0) = sv; |
231 | |
232 | XSRETURN(1); |
233 | } |
234 | |
235 | void |
236 | boot_core_UNIVERSAL() |
237 | { |
238 | char *file = __FILE__; |
239 | |
240 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
241 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
242 | newXS("UNIVERSAL::class", XS_UNIVERSAL_class, file); |
243 | newXS("UNIVERSAL::is_instance", XS_UNIVERSAL_is_instance, file); |
244 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
245 | } |