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 | ||
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 | ||
54310121 | 123 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 124 | XSRETURN(1); |
125 | } | |
126 | ||
127 | static | |
128 | XS(XS_UNIVERSAL_can) | |
129 | { | |
130 | dXSARGS; | |
131 | SV *sv; | |
132 | char *name; | |
133 | SV *rv; | |
6f08146e | 134 | HV *pkg = NULL; |
6d4a7be2 | 135 | |
136 | if (items != 2) | |
137 | croak("Usage: UNIVERSAL::can(object-ref, method)"); | |
138 | ||
139 | sv = ST(0); | |
140 | name = (char *)SvPV(ST(1),na); | |
141 | rv = &sv_undef; | |
142 | ||
6f08146e NIS |
143 | if(SvROK(sv)) { |
144 | sv = (SV*)SvRV(sv); | |
145 | if(SvOBJECT(sv)) | |
146 | pkg = SvSTASH(sv); | |
147 | } | |
148 | else { | |
149 | pkg = gv_stashsv(sv, FALSE); | |
150 | } | |
151 | ||
152 | if (pkg) { | |
dc848c6f | 153 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
154 | if (gv && isGV(gv)) | |
155 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 156 | } |
157 | ||
158 | ST(0) = rv; | |
159 | XSRETURN(1); | |
160 | } | |
161 | ||
162 | static | |
6d4a7be2 | 163 | XS(XS_UNIVERSAL_VERSION) |
164 | { | |
165 | dXSARGS; | |
166 | HV *pkg; | |
167 | GV **gvp; | |
168 | GV *gv; | |
169 | SV *sv; | |
170 | char *undef; | |
13826f2c | 171 | double req; |
6d4a7be2 | 172 | |
173 | if(SvROK(ST(0))) { | |
174 | sv = (SV*)SvRV(ST(0)); | |
175 | if(!SvOBJECT(sv)) | |
176 | croak("Cannot find version of an unblessed reference"); | |
177 | pkg = SvSTASH(sv); | |
178 | } | |
179 | else { | |
180 | pkg = gv_stashsv(ST(0), FALSE); | |
181 | } | |
182 | ||
183 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
184 | ||
185 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (sv = GvSV(gv))) { | |
186 | SV *nsv = sv_newmortal(); | |
187 | sv_setsv(nsv, sv); | |
188 | sv = nsv; | |
189 | undef = Nullch; | |
190 | } | |
191 | else { | |
192 | sv = (SV*)&sv_undef; | |
193 | undef = "(undef)"; | |
194 | } | |
195 | ||
13826f2c | 196 | if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) |
6d4a7be2 | 197 | croak("%s version %s required--this is only version %s", |
13826f2c | 198 | HvNAME(pkg), SvPV(ST(1),na), undef ? undef : SvPV(sv,na)); |
6d4a7be2 | 199 | |
200 | ST(0) = sv; | |
201 | ||
202 | XSRETURN(1); | |
203 | } | |
204 | ||
205 | void | |
206 | boot_core_UNIVERSAL() | |
207 | { | |
208 | char *file = __FILE__; | |
209 | ||
210 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); | |
211 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); | |
6d4a7be2 | 212 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
213 | } |