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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 | |
77 | static |
78 | XS(XS_UNIVERSAL_isa) |
79 | { |
80 | dXSARGS; |
81 | SV *sv, *rv; |
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82 | char *name, *type; |
83 | HV *stash; |
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84 | |
85 | if (items != 2) |
86 | croak("Usage: UNIVERSAL::isa(reference, kind)"); |
87 | |
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88 | stash = Nullhv; |
89 | type = Nullch; |
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90 | sv = ST(0); |
91 | name = (char *)SvPV(ST(1),na); |
92 | |
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93 | if (SvROK(sv)) { |
94 | sv = SvRV(sv); |
95 | type = sv_reftype(sv,0); |
96 | if(SvOBJECT(sv)) |
97 | stash = SvSTASH(sv); |
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98 | } |
99 | else { |
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100 | stash = gv_stashsv(sv, FALSE); |
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101 | } |
102 | |
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103 | ST(0) = (type && strEQ(type,name)) || |
104 | (stash && isa_lookup(stash, name, strlen(name), 0) == &sv_yes) |
105 | ? &sv_yes |
106 | : &sv_no; |
107 | |
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108 | XSRETURN(1); |
109 | } |
110 | |
111 | static |
112 | XS(XS_UNIVERSAL_can) |
113 | { |
114 | dXSARGS; |
115 | SV *sv; |
116 | char *name; |
117 | SV *rv; |
118 | GV *gv; |
119 | CV *cvp; |
120 | |
121 | if (items != 2) |
122 | croak("Usage: UNIVERSAL::can(object-ref, method)"); |
123 | |
124 | sv = ST(0); |
125 | name = (char *)SvPV(ST(1),na); |
126 | rv = &sv_undef; |
127 | |
128 | if(SvROK(sv) && (sv = (SV*)SvRV(sv)) && SvOBJECT(sv)) { |
129 | gv = gv_fetchmethod(SvSTASH(sv), name); |
130 | |
131 | if(gv && GvCV(gv)) { |
132 | /* If the sub is only a stub then we may have a gv to AUTOLOAD */ |
133 | GV **gvp = (GV**)hv_fetch(GvSTASH(gv), name, strlen(name), TRUE); |
134 | if(gvp && (cvp = GvCV(*gvp))) { |
135 | rv = sv_newmortal(); |
136 | sv_setsv(rv, newRV((SV*)cvp)); |
137 | } |
138 | } |
139 | } |
140 | |
141 | ST(0) = rv; |
142 | XSRETURN(1); |
143 | } |
144 | |
145 | static |
146 | XS(XS_UNIVERSAL_is_instance) |
147 | { |
148 | dXSARGS; |
149 | ST(0) = SvROK(ST(0)) ? &sv_yes : &sv_no; |
150 | XSRETURN(1); |
151 | } |
152 | |
153 | static |
154 | XS(XS_UNIVERSAL_class) |
155 | { |
156 | dXSARGS; |
157 | if(SvROK(ST(0))) { |
158 | SV *sv = sv_newmortal(); |
159 | sv_setpv(sv, HvNAME(SvSTASH(ST(0)))); |
160 | ST(0) = sv; |
161 | } |
162 | XSRETURN(1); |
163 | } |
164 | |
165 | static |
166 | XS(XS_UNIVERSAL_VERSION) |
167 | { |
168 | dXSARGS; |
169 | HV *pkg; |
170 | GV **gvp; |
171 | GV *gv; |
172 | SV *sv; |
173 | char *undef; |
174 | |
175 | if(SvROK(ST(0))) { |
176 | sv = (SV*)SvRV(ST(0)); |
177 | if(!SvOBJECT(sv)) |
178 | croak("Cannot find version of an unblessed reference"); |
179 | pkg = SvSTASH(sv); |
180 | } |
181 | else { |
182 | pkg = gv_stashsv(ST(0), FALSE); |
183 | } |
184 | |
185 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
186 | |
187 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (sv = GvSV(gv))) { |
188 | SV *nsv = sv_newmortal(); |
189 | sv_setsv(nsv, sv); |
190 | sv = nsv; |
191 | undef = Nullch; |
192 | } |
193 | else { |
194 | sv = (SV*)&sv_undef; |
195 | undef = "(undef)"; |
196 | } |
197 | |
198 | if(items > 1 && (undef || SvNV(ST(1)) > SvNV(sv))) |
199 | croak("%s version %s required--this is only version %s", |
200 | HvNAME(pkg),SvPV(ST(1),na),undef ? undef : SvPV(sv,na)); |
201 | |
202 | ST(0) = sv; |
203 | |
204 | XSRETURN(1); |
205 | } |
206 | |
207 | void |
208 | boot_core_UNIVERSAL() |
209 | { |
210 | char *file = __FILE__; |
211 | |
212 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
213 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
214 | newXS("UNIVERSAL::class", XS_UNIVERSAL_class, file); |
215 | newXS("UNIVERSAL::is_instance", XS_UNIVERSAL_is_instance, file); |
216 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
217 | } |