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; |
82 | char *name; |
83 | |
84 | if (items != 2) |
85 | croak("Usage: UNIVERSAL::isa(reference, kind)"); |
86 | |
87 | sv = ST(0); |
88 | name = (char *)SvPV(ST(1),na); |
89 | |
90 | if (!SvROK(sv)) { |
91 | rv = &sv_no; |
92 | } |
93 | else if((sv = (SV*)SvRV(sv)) && SvOBJECT(sv) && |
94 | &sv_yes == isa_lookup(SvSTASH(sv), name, strlen(name), 0)) { |
95 | rv = &sv_yes; |
96 | } |
97 | else { |
98 | char *s; |
99 | |
100 | switch (SvTYPE(sv)) { |
101 | case SVt_NULL: |
102 | case SVt_IV: |
103 | case SVt_NV: |
104 | case SVt_RV: |
105 | case SVt_PV: |
106 | case SVt_PVIV: |
107 | case SVt_PVNV: |
108 | case SVt_PVBM: |
109 | case SVt_PVMG: s = "SCALAR"; break; |
110 | case SVt_PVLV: s = "LVALUE"; break; |
111 | case SVt_PVAV: s = "ARRAY"; break; |
112 | case SVt_PVHV: s = "HASH"; break; |
113 | case SVt_PVCV: s = "CODE"; break; |
114 | case SVt_PVGV: s = "GLOB"; break; |
115 | case SVt_PVFM: s = "FORMATLINE"; break; |
116 | case SVt_PVIO: s = "FILEHANDLE"; break; |
117 | default: s = "UNKNOWN"; break; |
118 | } |
119 | rv = strEQ(s,name) ? &sv_yes : &sv_no; |
120 | } |
121 | |
122 | ST(0) = rv; |
123 | XSRETURN(1); |
124 | } |
125 | |
126 | static |
127 | XS(XS_UNIVERSAL_can) |
128 | { |
129 | dXSARGS; |
130 | SV *sv; |
131 | char *name; |
132 | SV *rv; |
133 | GV *gv; |
134 | CV *cvp; |
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 | |
143 | if(SvROK(sv) && (sv = (SV*)SvRV(sv)) && SvOBJECT(sv)) { |
144 | gv = gv_fetchmethod(SvSTASH(sv), name); |
145 | |
146 | if(gv && GvCV(gv)) { |
147 | /* If the sub is only a stub then we may have a gv to AUTOLOAD */ |
148 | GV **gvp = (GV**)hv_fetch(GvSTASH(gv), name, strlen(name), TRUE); |
149 | if(gvp && (cvp = GvCV(*gvp))) { |
150 | rv = sv_newmortal(); |
151 | sv_setsv(rv, newRV((SV*)cvp)); |
152 | } |
153 | } |
154 | } |
155 | |
156 | ST(0) = rv; |
157 | XSRETURN(1); |
158 | } |
159 | |
160 | static |
161 | XS(XS_UNIVERSAL_is_instance) |
162 | { |
163 | dXSARGS; |
164 | ST(0) = SvROK(ST(0)) ? &sv_yes : &sv_no; |
165 | XSRETURN(1); |
166 | } |
167 | |
168 | static |
169 | XS(XS_UNIVERSAL_class) |
170 | { |
171 | dXSARGS; |
172 | if(SvROK(ST(0))) { |
173 | SV *sv = sv_newmortal(); |
174 | sv_setpv(sv, HvNAME(SvSTASH(ST(0)))); |
175 | ST(0) = sv; |
176 | } |
177 | XSRETURN(1); |
178 | } |
179 | |
180 | static |
181 | XS(XS_UNIVERSAL_VERSION) |
182 | { |
183 | dXSARGS; |
184 | HV *pkg; |
185 | GV **gvp; |
186 | GV *gv; |
187 | SV *sv; |
188 | char *undef; |
189 | |
190 | if(SvROK(ST(0))) { |
191 | sv = (SV*)SvRV(ST(0)); |
192 | if(!SvOBJECT(sv)) |
193 | croak("Cannot find version of an unblessed reference"); |
194 | pkg = SvSTASH(sv); |
195 | } |
196 | else { |
197 | pkg = gv_stashsv(ST(0), FALSE); |
198 | } |
199 | |
200 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); |
201 | |
202 | if (gvp && (gv = *gvp) != (GV*)&sv_undef && (sv = GvSV(gv))) { |
203 | SV *nsv = sv_newmortal(); |
204 | sv_setsv(nsv, sv); |
205 | sv = nsv; |
206 | undef = Nullch; |
207 | } |
208 | else { |
209 | sv = (SV*)&sv_undef; |
210 | undef = "(undef)"; |
211 | } |
212 | |
213 | if(items > 1 && (undef || SvNV(ST(1)) > SvNV(sv))) |
214 | croak("%s version %s required--this is only version %s", |
215 | HvNAME(pkg),SvPV(ST(1),na),undef ? undef : SvPV(sv,na)); |
216 | |
217 | ST(0) = sv; |
218 | |
219 | XSRETURN(1); |
220 | } |
221 | |
222 | void |
223 | boot_core_UNIVERSAL() |
224 | { |
225 | char *file = __FILE__; |
226 | |
227 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); |
228 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); |
229 | newXS("UNIVERSAL::class", XS_UNIVERSAL_class, file); |
230 | newXS("UNIVERSAL::is_instance", XS_UNIVERSAL_is_instance, file); |
231 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
232 | } |