1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/* xsutils.c
*
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
* by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'Perilous to us all are the devices of an art deeper than we possess
* ourselves.' --Gandalf
*
* [p.597 of _The Lord of the Rings_, III/xi: "The PalantÃr"]
*/
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
/*
* Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us).
*/
static int
modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs)
{
dVAR;
SV *attr;
int nret;
for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) {
STRLEN len;
const char *name = SvPV_const(attr, len);
const bool negated = (*name == '-');
if (negated) {
name++;
len--;
}
switch (SvTYPE(sv)) {
case SVt_PVCV:
switch ((int)len) {
case 5:
if (memEQ(name, "const", 5)) {
if (negated)
CvANONCONST_off(sv);
else {
const bool warn = (!CvCLONE(sv) || CvCLONED(sv))
&& !CvANONCONST(sv);
CvANONCONST_on(sv);
if (warn)
break;
}
continue;
}
break;
case 6:
switch (name[3]) {
case 'l':
if (memEQ(name, "lvalue", 6)) {
bool warn =
!CvISXSUB(MUTABLE_CV(sv))
&& CvROOT(MUTABLE_CV(sv))
&& !CvLVALUE(MUTABLE_CV(sv)) != negated;
if (negated)
CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_LVALUE;
else
CvFLAGS(MUTABLE_CV(sv)) |= CVf_LVALUE;
if (warn) break;
continue;
}
break;
case 'h':
if (memEQ(name, "method", 6)) {
if (negated)
CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_METHOD;
else
CvFLAGS(MUTABLE_CV(sv)) |= CVf_METHOD;
continue;
}
break;
}
break;
default:
if (len > 10 && memEQ(name, "prototype(", 10)) {
SV * proto = newSVpvn(name+10,len-11);
HEK *const hek = CvNAME_HEK((CV *)sv);
SV *subname;
if (name[len-1] != ')')
Perl_croak(aTHX_ "Unterminated attribute parameter in attribute list");
if (hek)
subname = sv_2mortal(newSVhek(hek));
else
subname=(SV *)CvGV((const CV *)sv);
if (ckWARN(WARN_ILLEGALPROTO))
Perl_validate_proto(aTHX_ subname, proto, TRUE);
Perl_cv_ckproto_len_flags(aTHX_ (const CV *)sv,
(const GV *)subname,
name+10,
len-11,
SvUTF8(attr));
sv_setpvn(MUTABLE_SV(sv), name+10, len-11);
if (SvUTF8(attr)) SvUTF8_on(MUTABLE_SV(sv));
continue;
}
break;
}
break;
default:
if (memEQs(name, len, "shared")) {
if (negated)
Perl_croak(aTHX_ "A variable may not be unshared");
SvSHARE(sv);
continue;
}
break;
}
/* anything recognized had a 'continue' above */
*retlist++ = attr;
nret++;
}
return nret;
}
MODULE = attributes PACKAGE = attributes
void
_modify_attrs(...)
PREINIT:
SV *rv, *sv;
PPCODE:
if (items < 1) {
usage:
croak_xs_usage(cv, "@attributes");
}
rv = ST(0);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (items > 1)
XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1));
XSRETURN(0);
void
_fetch_attrs(...)
PROTOTYPE: $
PREINIT:
SV *rv, *sv;
cv_flags_t cvflags;
PPCODE:
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
switch (SvTYPE(sv)) {
case SVt_PVCV:
cvflags = CvFLAGS((const CV *)sv);
if (cvflags & CVf_LVALUE)
XPUSHs(newSVpvs_flags("lvalue", SVs_TEMP));
if (cvflags & CVf_METHOD)
XPUSHs(newSVpvs_flags("method", SVs_TEMP));
break;
default:
break;
}
PUTBACK;
void
_guess_stash(...)
PROTOTYPE: $
PREINIT:
SV *rv, *sv;
dXSTARG;
PPCODE:
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
ST(0) = TARG;
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (SvOBJECT(sv))
Perl_sv_sethek(aTHX_ TARG, HvNAME_HEK(SvSTASH(sv)));
#if 0 /* this was probably a bad idea */
else if (SvPADMY(sv))
sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */
#endif
else {
const HV *stash = NULL;
switch (SvTYPE(sv)) {
case SVt_PVCV:
if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv)))
stash = GvSTASH(CvGV(sv));
else if (/* !CvANON(sv) && */ CvSTASH(sv))
stash = CvSTASH(sv);
break;
case SVt_PVGV:
if (isGV_with_GP(sv) && GvGP(sv) && GvESTASH(MUTABLE_GV(sv)))
stash = GvESTASH(MUTABLE_GV(sv));
break;
default:
break;
}
if (stash)
Perl_sv_sethek(aTHX_ TARG, HvNAME_HEK(stash));
}
SvSETMAGIC(TARG);
XSRETURN(1);
void
reftype(...)
PROTOTYPE: $
PREINIT:
SV *rv, *sv;
dXSTARG;
PPCODE:
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
ST(0) = TARG;
SvGETMAGIC(rv);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
sv_setpv(TARG, sv_reftype(sv, 0));
SvSETMAGIC(TARG);
XSRETURN(1);
/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*
* ex: set ts=8 sts=4 sw=4 et:
*/
|
