Commit | Line | Data |
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 |
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 | } |