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 * | |
8ac85365 | 11 | isa_lookup(HV *stash, char *name, int len, int level) |
6d4a7be2 | 12 | { |
13 | AV* av; | |
14 | GV* gv; | |
15 | GV** gvp; | |
16 | HV* hv = Nullhv; | |
17 | ||
18 | if (!stash) | |
19 | return &sv_undef; | |
20 | ||
21 | if(strEQ(HvNAME(stash), name)) | |
22 | return &sv_yes; | |
23 | ||
24 | if (level > 100) | |
25 | croak("Recursive inheritance detected"); | |
26 | ||
27 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); | |
28 | ||
29 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv))) { | |
30 | SV* sv; | |
31 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); | |
32 | if (svp && (sv = *svp) != (SV*)&sv_undef) | |
33 | return sv; | |
34 | } | |
35 | ||
36 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); | |
37 | ||
38 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) { | |
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); | |
51 | I32 items = AvFILL(av) + 1; | |
52 | while (items--) { | |
53 | SV* sv = *svp++; | |
54 | HV* basestash = gv_stashsv(sv, FALSE); | |
55 | if (!basestash) { | |
56 | if (dowarn) | |
57 | warn("Can't locate package %s for @%s::ISA", | |
58 | SvPVX(sv), HvNAME(stash)); | |
59 | continue; | |
60 | } | |
61 | if(&sv_yes == isa_lookup(basestash, name, len, level + 1)) { | |
62 | (void)hv_store(hv,name,len,&sv_yes,0); | |
63 | return &sv_yes; | |
64 | } | |
65 | } | |
66 | (void)hv_store(hv,name,len,&sv_no,0); | |
67 | } | |
68 | } | |
69 | ||
e09f3e01 | 70 | return boolSV(strEQ(name, "UNIVERSAL")); |
6d4a7be2 | 71 | } |
72 | ||
55497cff | 73 | bool |
8ac85365 | 74 | sv_derived_from(SV *sv, char *name) |
55497cff | 75 | { |
76 | SV *rv; | |
77 | char *type; | |
78 | HV *stash; | |
79 | ||
80 | stash = Nullhv; | |
81 | type = Nullch; | |
82 | ||
83 | if (SvGMAGICAL(sv)) | |
84 | mg_get(sv) ; | |
85 | ||
86 | if (SvROK(sv)) { | |
87 | sv = SvRV(sv); | |
88 | type = sv_reftype(sv,0); | |
89 | if(SvOBJECT(sv)) | |
90 | stash = SvSTASH(sv); | |
91 | } | |
92 | else { | |
93 | stash = gv_stashsv(sv, FALSE); | |
94 | } | |
95 | ||
96 | return (type && strEQ(type,name)) || | |
97 | (stash && isa_lookup(stash, name, strlen(name), 0) == &sv_yes) | |
98 | ? TRUE | |
99 | : FALSE ; | |
100 | ||
101 | } | |
102 | ||
103 | ||
6d4a7be2 | 104 | static |
105 | XS(XS_UNIVERSAL_isa) | |
106 | { | |
107 | dXSARGS; | |
55497cff | 108 | SV *sv; |
109 | char *name; | |
6d4a7be2 | 110 | |
111 | if (items != 2) | |
112 | croak("Usage: UNIVERSAL::isa(reference, kind)"); | |
113 | ||
114 | sv = ST(0); | |
115 | name = (char *)SvPV(ST(1),na); | |
116 | ||
54310121 | 117 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 118 | XSRETURN(1); |
119 | } | |
120 | ||
121 | static | |
122 | XS(XS_UNIVERSAL_can) | |
123 | { | |
124 | dXSARGS; | |
125 | SV *sv; | |
126 | char *name; | |
127 | SV *rv; | |
6f08146e | 128 | HV *pkg = NULL; |
6d4a7be2 | 129 | |
130 | if (items != 2) | |
131 | croak("Usage: UNIVERSAL::can(object-ref, method)"); | |
132 | ||
133 | sv = ST(0); | |
134 | name = (char *)SvPV(ST(1),na); | |
135 | rv = &sv_undef; | |
136 | ||
6f08146e NIS |
137 | if(SvROK(sv)) { |
138 | sv = (SV*)SvRV(sv); | |
139 | if(SvOBJECT(sv)) | |
140 | pkg = SvSTASH(sv); | |
141 | } | |
142 | else { | |
143 | pkg = gv_stashsv(sv, FALSE); | |
144 | } | |
145 | ||
146 | if (pkg) { | |
dc848c6f | 147 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
148 | if (gv && isGV(gv)) | |
149 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 150 | } |
151 | ||
152 | ST(0) = rv; | |
153 | XSRETURN(1); | |
154 | } | |
155 | ||
156 | static | |
6d4a7be2 | 157 | XS(XS_UNIVERSAL_VERSION) |
158 | { | |
159 | dXSARGS; | |
160 | HV *pkg; | |
161 | GV **gvp; | |
162 | GV *gv; | |
163 | SV *sv; | |
164 | char *undef; | |
13826f2c | 165 | double req; |
6d4a7be2 | 166 | |
167 | if(SvROK(ST(0))) { | |
168 | sv = (SV*)SvRV(ST(0)); | |
169 | if(!SvOBJECT(sv)) | |
170 | croak("Cannot find version of an unblessed reference"); | |
171 | pkg = SvSTASH(sv); | |
172 | } | |
173 | else { | |
174 | pkg = gv_stashsv(ST(0), FALSE); | |
175 | } | |
176 | ||
177 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
178 | ||
179 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (sv = GvSV(gv))) { | |
180 | SV *nsv = sv_newmortal(); | |
181 | sv_setsv(nsv, sv); | |
182 | sv = nsv; | |
183 | undef = Nullch; | |
184 | } | |
185 | else { | |
186 | sv = (SV*)&sv_undef; | |
187 | undef = "(undef)"; | |
188 | } | |
189 | ||
13826f2c | 190 | if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) |
6d4a7be2 | 191 | croak("%s version %s required--this is only version %s", |
13826f2c | 192 | HvNAME(pkg), SvPV(ST(1),na), undef ? undef : SvPV(sv,na)); |
6d4a7be2 | 193 | |
194 | ST(0) = sv; | |
195 | ||
196 | XSRETURN(1); | |
197 | } | |
198 | ||
199 | void | |
8ac85365 | 200 | boot_core_UNIVERSAL(void) |
6d4a7be2 | 201 | { |
202 | char *file = __FILE__; | |
203 | ||
204 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); | |
205 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); | |
6d4a7be2 | 206 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
207 | } |