This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
document unimplemented status of forking pipe open() on windows
[perl5.git] / universal.c
CommitLineData
6d4a7be2 1#include "EXTERN.h"
864dbfa3 2#define PERL_IN_UNIVERSAL_C
6d4a7be2 3#include "perl.h"
6d4a7be2
PP
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
76e3520e 10STATIC SV *
cea2e8a9 11S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
6d4a7be2
PP
12{
13 AV* av;
14 GV* gv;
15 GV** gvp;
16 HV* hv = Nullhv;
17
18 if (!stash)
3280af22 19 return &PL_sv_undef;
6d4a7be2
PP
20
21 if(strEQ(HvNAME(stash), name))
3280af22 22 return &PL_sv_yes;
6d4a7be2
PP
23
24 if (level > 100)
cea2e8a9 25 Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'", HvNAME(stash));
6d4a7be2
PP
26
27 gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
28
3280af22 29 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) {
6d4a7be2
PP
30 SV* sv;
31 SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
3280af22 32 if (svp && (sv = *svp) != (SV*)&PL_sv_undef)
6d4a7be2
PP
33 return sv;
34 }
35
36 gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
37
3280af22 38 if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
6d4a7be2
PP
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);
93965878
NIS
51 /* NOTE: No support for tied ISA */
52 I32 items = AvFILLp(av) + 1;
6d4a7be2
PP
53 while (items--) {
54 SV* sv = *svp++;
55 HV* basestash = gv_stashsv(sv, FALSE);
56 if (!basestash) {
d008e5eb 57 dTHR;
599cee73 58 if (ckWARN(WARN_MISC))
cea2e8a9 59 Perl_warner(aTHX_ WARN_SYNTAX,
599cee73 60 "Can't locate package %s for @%s::ISA",
6d4a7be2
PP
61 SvPVX(sv), HvNAME(stash));
62 continue;
63 }
3280af22
NIS
64 if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
65 (void)hv_store(hv,name,len,&PL_sv_yes,0);
66 return &PL_sv_yes;
6d4a7be2
PP
67 }
68 }
3280af22 69 (void)hv_store(hv,name,len,&PL_sv_no,0);
6d4a7be2
PP
70 }
71 }
72
e09f3e01 73 return boolSV(strEQ(name, "UNIVERSAL"));
6d4a7be2
PP
74}
75
55497cff 76bool
864dbfa3 77Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
55497cff
PP
78{
79 SV *rv;
80 char *type;
81 HV *stash;
82
83 stash = Nullhv;
84 type = Nullch;
85
86 if (SvGMAGICAL(sv))
87 mg_get(sv) ;
88
89 if (SvROK(sv)) {
90 sv = SvRV(sv);
91 type = sv_reftype(sv,0);
92 if(SvOBJECT(sv))
93 stash = SvSTASH(sv);
94 }
95 else {
96 stash = gv_stashsv(sv, FALSE);
97 }
98
99 return (type && strEQ(type,name)) ||
3280af22 100 (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes)
55497cff
PP
101 ? TRUE
102 : FALSE ;
103
104}
105
0cb96387
GS
106void XS_UNIVERSAL_isa(pTHXo_ CV *cv);
107void XS_UNIVERSAL_can(pTHXo_ CV *cv);
108void XS_UNIVERSAL_VERSION(pTHXo_ CV *cv);
109
110void
111Perl_boot_core_UNIVERSAL(pTHX)
112{
113 char *file = __FILE__;
114
115 newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
116 newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
117 newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
118}
119
76e3520e 120#include "XSUB.h"
55497cff 121
6d4a7be2
PP
122XS(XS_UNIVERSAL_isa)
123{
124 dXSARGS;
55497cff
PP
125 SV *sv;
126 char *name;
2d8e6c8d 127 STRLEN n_a;
6d4a7be2
PP
128
129 if (items != 2)
cea2e8a9 130 Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
6d4a7be2
PP
131
132 sv = ST(0);
2d8e6c8d 133 name = (char *)SvPV(ST(1),n_a);
6d4a7be2 134
54310121 135 ST(0) = boolSV(sv_derived_from(sv, name));
6d4a7be2
PP
136 XSRETURN(1);
137}
138
6d4a7be2
PP
139XS(XS_UNIVERSAL_can)
140{
141 dXSARGS;
142 SV *sv;
143 char *name;
144 SV *rv;
6f08146e 145 HV *pkg = NULL;
2d8e6c8d 146 STRLEN n_a;
6d4a7be2
PP
147
148 if (items != 2)
cea2e8a9 149 Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
6d4a7be2
PP
150
151 sv = ST(0);
2d8e6c8d 152 name = (char *)SvPV(ST(1),n_a);
3280af22 153 rv = &PL_sv_undef;
6d4a7be2 154
6f08146e
NIS
155 if(SvROK(sv)) {
156 sv = (SV*)SvRV(sv);
157 if(SvOBJECT(sv))
158 pkg = SvSTASH(sv);
159 }
160 else {
161 pkg = gv_stashsv(sv, FALSE);
162 }
163
164 if (pkg) {
dc848c6f
PP
165 GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
166 if (gv && isGV(gv))
167 rv = sv_2mortal(newRV((SV*)GvCV(gv)));
6d4a7be2
PP
168 }
169
170 ST(0) = rv;
171 XSRETURN(1);
172}
173
6d4a7be2
PP
174XS(XS_UNIVERSAL_VERSION)
175{
176 dXSARGS;
177 HV *pkg;
178 GV **gvp;
179 GV *gv;
180 SV *sv;
181 char *undef;
cad2e5aa 182 NV req;
6d4a7be2
PP
183
184 if(SvROK(ST(0))) {
185 sv = (SV*)SvRV(ST(0));
186 if(!SvOBJECT(sv))
cea2e8a9 187 Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
6d4a7be2
PP
188 pkg = SvSTASH(sv);
189 }
190 else {
191 pkg = gv_stashsv(ST(0), FALSE);
192 }
193
194 gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);
195
d4bea2fb 196 if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
6d4a7be2
PP
197 SV *nsv = sv_newmortal();
198 sv_setsv(nsv, sv);
199 sv = nsv;
200 undef = Nullch;
201 }
202 else {
3280af22 203 sv = (SV*)&PL_sv_undef;
6d4a7be2
PP
204 undef = "(undef)";
205 }
206
2d8e6c8d
GS
207 if (items > 1 && (undef || (req = SvNV(ST(1)), req > SvNV(sv)))) {
208 STRLEN n_a;
cea2e8a9 209 Perl_croak(aTHX_ "%s version %s required--this is only version %s",
2d8e6c8d
GS
210 HvNAME(pkg), SvPV(ST(1),n_a), undef ? undef : SvPV(sv,n_a));
211 }
6d4a7be2
PP
212
213 ST(0) = sv;
214
215 XSRETURN(1);
216}
217