Commit | Line | Data |
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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 | ||
77 | static | |
78 | XS(XS_UNIVERSAL_isa) | |
79 | { | |
80 | dXSARGS; | |
81 | SV *sv, *rv; | |
760ac839 LW |
82 | char *name, *type; |
83 | HV *stash; | |
6d4a7be2 | 84 | |
85 | if (items != 2) | |
86 | croak("Usage: UNIVERSAL::isa(reference, kind)"); | |
87 | ||
760ac839 LW |
88 | stash = Nullhv; |
89 | type = Nullch; | |
6d4a7be2 | 90 | sv = ST(0); |
91 | name = (char *)SvPV(ST(1),na); | |
92 | ||
760ac839 LW |
93 | if (SvROK(sv)) { |
94 | sv = SvRV(sv); | |
95 | type = sv_reftype(sv,0); | |
96 | if(SvOBJECT(sv)) | |
97 | stash = SvSTASH(sv); | |
6d4a7be2 | 98 | } |
99 | else { | |
760ac839 | 100 | stash = gv_stashsv(sv, FALSE); |
6d4a7be2 | 101 | } |
102 | ||
760ac839 LW |
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 | ||
6d4a7be2 | 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; | |
bf3f28f2 | 157 | if(SvROK(ST(0)) && SvOBJECT(SvRV(ST(0)))) { |
6d4a7be2 | 158 | SV *sv = sv_newmortal(); |
bf3f28f2 | 159 | sv_setpv(sv, HvNAME(SvSTASH(SvRV(ST(0))))); |
6d4a7be2 | 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 | } |