Commit | Line | Data |
---|---|---|
6d4a7be2 | 1 | #include "EXTERN.h" |
2 | #include "perl.h" | |
6d4a7be2 | 3 | |
4 | /* | |
5 | * Contributed by Graham Barr <Graham.Barr@tiuk.ti.com> | |
6 | * The main guts of traverse_isa was actually copied from gv_fetchmeth | |
7 | */ | |
8 | ||
76e3520e | 9 | STATIC SV * |
8ac85365 | 10 | isa_lookup(HV *stash, char *name, int len, int level) |
6d4a7be2 | 11 | { |
12 | AV* av; | |
13 | GV* gv; | |
14 | GV** gvp; | |
15 | HV* hv = Nullhv; | |
16 | ||
17 | if (!stash) | |
3280af22 | 18 | return &PL_sv_undef; |
6d4a7be2 | 19 | |
20 | if(strEQ(HvNAME(stash), name)) | |
3280af22 | 21 | return &PL_sv_yes; |
6d4a7be2 | 22 | |
23 | if (level > 100) | |
3e0ccd42 | 24 | croak("Recursive inheritance detected in package '%s'", HvNAME(stash)); |
6d4a7be2 | 25 | |
26 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE); | |
27 | ||
3280af22 | 28 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) { |
6d4a7be2 | 29 | SV* sv; |
30 | SV** svp = (SV**)hv_fetch(hv, name, len, FALSE); | |
3280af22 | 31 | if (svp && (sv = *svp) != (SV*)&PL_sv_undef) |
6d4a7be2 | 32 | return sv; |
33 | } | |
34 | ||
35 | gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE); | |
36 | ||
3280af22 | 37 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) { |
6d4a7be2 | 38 | if(!hv) { |
39 | gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE); | |
40 | ||
41 | gv = *gvp; | |
42 | ||
43 | if (SvTYPE(gv) != SVt_PVGV) | |
44 | gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE); | |
45 | ||
46 | hv = GvHVn(gv); | |
47 | } | |
48 | if(hv) { | |
49 | SV** svp = AvARRAY(av); | |
93965878 NIS |
50 | /* NOTE: No support for tied ISA */ |
51 | I32 items = AvFILLp(av) + 1; | |
6d4a7be2 | 52 | while (items--) { |
53 | SV* sv = *svp++; | |
54 | HV* basestash = gv_stashsv(sv, FALSE); | |
55 | if (!basestash) { | |
3280af22 | 56 | if (PL_dowarn) |
6d4a7be2 | 57 | warn("Can't locate package %s for @%s::ISA", |
58 | SvPVX(sv), HvNAME(stash)); | |
59 | continue; | |
60 | } | |
3280af22 NIS |
61 | if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) { |
62 | (void)hv_store(hv,name,len,&PL_sv_yes,0); | |
63 | return &PL_sv_yes; | |
6d4a7be2 | 64 | } |
65 | } | |
3280af22 | 66 | (void)hv_store(hv,name,len,&PL_sv_no,0); |
6d4a7be2 | 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)) || | |
3280af22 | 97 | (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes) |
55497cff | 98 | ? TRUE |
99 | : FALSE ; | |
100 | ||
101 | } | |
102 | ||
565764a8 DL |
103 | #ifdef PERL_OBJECT |
104 | #define NO_XSLOCKS | |
105 | #endif /* PERL_OBJECT */ | |
106 | ||
76e3520e | 107 | #include "XSUB.h" |
55497cff | 108 | |
6d4a7be2 | 109 | static |
110 | XS(XS_UNIVERSAL_isa) | |
111 | { | |
112 | dXSARGS; | |
55497cff | 113 | SV *sv; |
114 | char *name; | |
6d4a7be2 | 115 | |
116 | if (items != 2) | |
117 | croak("Usage: UNIVERSAL::isa(reference, kind)"); | |
118 | ||
119 | sv = ST(0); | |
3280af22 | 120 | name = (char *)SvPV(ST(1),PL_na); |
6d4a7be2 | 121 | |
54310121 | 122 | ST(0) = boolSV(sv_derived_from(sv, name)); |
6d4a7be2 | 123 | XSRETURN(1); |
124 | } | |
125 | ||
126 | static | |
127 | XS(XS_UNIVERSAL_can) | |
128 | { | |
129 | dXSARGS; | |
130 | SV *sv; | |
131 | char *name; | |
132 | SV *rv; | |
6f08146e | 133 | HV *pkg = NULL; |
6d4a7be2 | 134 | |
135 | if (items != 2) | |
136 | croak("Usage: UNIVERSAL::can(object-ref, method)"); | |
137 | ||
138 | sv = ST(0); | |
3280af22 NIS |
139 | name = (char *)SvPV(ST(1),PL_na); |
140 | rv = &PL_sv_undef; | |
6d4a7be2 | 141 | |
6f08146e NIS |
142 | if(SvROK(sv)) { |
143 | sv = (SV*)SvRV(sv); | |
144 | if(SvOBJECT(sv)) | |
145 | pkg = SvSTASH(sv); | |
146 | } | |
147 | else { | |
148 | pkg = gv_stashsv(sv, FALSE); | |
149 | } | |
150 | ||
151 | if (pkg) { | |
dc848c6f | 152 | GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE); |
153 | if (gv && isGV(gv)) | |
154 | rv = sv_2mortal(newRV((SV*)GvCV(gv))); | |
6d4a7be2 | 155 | } |
156 | ||
157 | ST(0) = rv; | |
158 | XSRETURN(1); | |
159 | } | |
160 | ||
161 | static | |
6d4a7be2 | 162 | XS(XS_UNIVERSAL_VERSION) |
163 | { | |
164 | dXSARGS; | |
165 | HV *pkg; | |
166 | GV **gvp; | |
167 | GV *gv; | |
168 | SV *sv; | |
169 | char *undef; | |
13826f2c | 170 | double req; |
6d4a7be2 | 171 | |
172 | if(SvROK(ST(0))) { | |
173 | sv = (SV*)SvRV(ST(0)); | |
174 | if(!SvOBJECT(sv)) | |
175 | croak("Cannot find version of an unblessed reference"); | |
176 | pkg = SvSTASH(sv); | |
177 | } | |
178 | else { | |
179 | pkg = gv_stashsv(ST(0), FALSE); | |
180 | } | |
181 | ||
182 | gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**); | |
183 | ||
3280af22 | 184 | if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (sv = GvSV(gv))) { |
6d4a7be2 | 185 | SV *nsv = sv_newmortal(); |
186 | sv_setsv(nsv, sv); | |
187 | sv = nsv; | |
188 | undef = Nullch; | |
189 | } | |
190 | else { | |
3280af22 | 191 | sv = (SV*)&PL_sv_undef; |
6d4a7be2 | 192 | undef = "(undef)"; |
193 | } | |
194 | ||
13826f2c | 195 | if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) |
6d4a7be2 | 196 | croak("%s version %s required--this is only version %s", |
3280af22 | 197 | HvNAME(pkg), SvPV(ST(1),PL_na), undef ? undef : SvPV(sv,PL_na)); |
6d4a7be2 | 198 | |
199 | ST(0) = sv; | |
200 | ||
201 | XSRETURN(1); | |
202 | } | |
203 | ||
76e3520e GS |
204 | #ifdef PERL_OBJECT |
205 | #undef boot_core_UNIVERSAL | |
206 | #define boot_core_UNIVERSAL CPerlObj::Perl_boot_core_UNIVERSAL | |
207 | #define pPerl this | |
208 | #endif | |
209 | ||
6d4a7be2 | 210 | void |
8ac85365 | 211 | boot_core_UNIVERSAL(void) |
6d4a7be2 | 212 | { |
213 | char *file = __FILE__; | |
214 | ||
215 | newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file); | |
216 | newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file); | |
6d4a7be2 | 217 | newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file); |
218 | } |