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
|
/* builtin.c
*
* Copyright (C) 2021 by Paul Evans 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.
*
*/
/* This file contains the code that implements functions in perl's "builtin::"
* namespace
*/
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
struct BuiltinFuncDescriptor {
const char *name;
XSUBADDR_t xsub;
OP *(*checker)(pTHX_ OP *, GV *, SV *);
IV ckval;
};
XS(XS_builtin_true);
XS(XS_builtin_true)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
XSRETURN_YES;
}
XS(XS_builtin_false);
XS(XS_builtin_false)
{
dXSARGS;
if(items)
croak_xs_usage(cv, "");
XSRETURN_NO;
}
enum {
BUILTIN_CONST_FALSE,
BUILTIN_CONST_TRUE,
};
static OP *ck_builtin_const(pTHX_ OP *entersubop, GV *namegv, SV *ckobj)
{
const struct BuiltinFuncDescriptor *builtin = NUM2PTR(const struct BuiltinFuncDescriptor *, SvUV(ckobj));
SV *prototype = newSVpvs("");
SAVEFREESV(prototype);
assert(entersubop->op_type == OP_ENTERSUB);
entersubop = ck_entersub_args_proto(entersubop, namegv, prototype);
SV *constval;
switch(builtin->ckval) {
case BUILTIN_CONST_FALSE: constval = &PL_sv_no; break;
case BUILTIN_CONST_TRUE: constval = &PL_sv_yes; break;
default:
DIE(aTHX_ "panic: unrecognised builtin_const value %" IVdf, builtin->ckval);
break;
}
op_free(entersubop);
return newSVOP(OP_CONST, 0, constval);
}
enum {
BUILTIN_FUNC1_ISBOOL = 1,
};
XS(XS_builtin_func1);
XS(XS_builtin_func1)
{
dXSARGS;
dXSI32;
if(items != 1)
croak_xs_usage(cv, "arg");
switch(ix) {
case BUILTIN_FUNC1_ISBOOL:
Perl_pp_isbool(aTHX);
break;
default:
Perl_die(aTHX_ "panic: unhandled ix value %d for xs_builtin_func1()", ix);
}
XSRETURN(1);
}
static OP *ck_builtin_func1(pTHX_ OP *entersubop, GV *namegv, SV *ckobj)
{
const struct BuiltinFuncDescriptor *builtin = NUM2PTR(const struct BuiltinFuncDescriptor *, SvUV(ckobj));
SV *prototype = newSVpvs("$");
SAVEFREESV(prototype);
assert(entersubop->op_type == OP_ENTERSUB);
entersubop = ck_entersub_args_proto(entersubop, namegv, prototype);
OP *parent = entersubop, *pushop, *argop;
pushop = cUNOPx(entersubop)->op_first;
if (!OpHAS_SIBLING(pushop)) {
pushop = cUNOPx(pushop)->op_first;
}
argop = OpSIBLING(pushop);
if (!argop || !OpHAS_SIBLING(argop) || OpHAS_SIBLING(OpSIBLING(argop)))
return entersubop;
(void)op_sibling_splice(parent, pushop, 1, NULL);
U8 flags = entersubop->op_flags;
op_free(entersubop);
OPCODE opcode;
switch(builtin->ckval) {
case BUILTIN_FUNC1_ISBOOL: opcode = OP_ISBOOL; break;
default:
DIE(aTHX_ "panic: unhandled ckval value %" IVdf " for ck_builtin_func1()", builtin->ckval);
}
return newUNOP(opcode, flags, argop);
}
static const char builtin_not_recognised[] = "'%" SVf "' is not recognised as a builtin function";
static const struct BuiltinFuncDescriptor builtins[] = {
/* constants */
{ "builtin::true", &XS_builtin_true, &ck_builtin_const, BUILTIN_CONST_TRUE },
{ "builtin::false", &XS_builtin_false, &ck_builtin_const, BUILTIN_CONST_FALSE },
/* unary functions */
{ "builtin::isbool", &XS_builtin_func1, &ck_builtin_func1, BUILTIN_FUNC1_ISBOOL },
{ 0 }
};
XS(XS_builtin_import);
XS(XS_builtin_import)
{
dXSARGS;
if(!PL_compcv)
Perl_croak(aTHX_
"builtin::import can only be called at compiletime");
/* We need to have PL_comppad / PL_curpad set correctly for lexical importing */
ENTER;
SAVESPTR(PL_comppad_name); PL_comppad_name = PadlistNAMES(CvPADLIST(PL_compcv));
SAVESPTR(PL_comppad); PL_comppad = PadlistARRAY(CvPADLIST(PL_compcv))[1];
SAVESPTR(PL_curpad); PL_curpad = PadARRAY(PL_comppad);
for(int i = 1; i < items; i++) {
SV *sym = ST(i);
if(strEQ(SvPV_nolen(sym), "import"))
Perl_croak(aTHX_ builtin_not_recognised, sym);
SV *ampname = sv_2mortal(Perl_newSVpvf(aTHX_ "&%" SVf, SVfARG(sym)));
SV *fqname = sv_2mortal(Perl_newSVpvf(aTHX_ "builtin::%" SVf, SVfARG(sym)));
CV *cv = get_cv(SvPV_nolen(fqname), SvUTF8(fqname) ? SVf_UTF8 : 0);
if(!cv)
Perl_croak(aTHX_ builtin_not_recognised, sym);
PADOFFSET off = pad_add_name_sv(ampname, padadd_STATE, 0, 0);
SvREFCNT_dec(PL_curpad[off]);
PL_curpad[off] = SvREFCNT_inc(cv);
}
intro_my();
LEAVE;
}
void
Perl_boot_core_builtin(pTHX)
{
I32 i;
for(i = 0; builtins[i].name; i++) {
const struct BuiltinFuncDescriptor *builtin = &builtins[i];
const char *proto = NULL;
if(builtin->checker == &ck_builtin_const)
proto = "";
else if(builtin->checker == &ck_builtin_func1)
proto = "$";
CV *cv = newXS_flags(builtin->name, builtin->xsub, __FILE__, proto, 0);
XSANY.any_i32 = builtin->ckval;
if(builtin->checker) {
cv_set_call_checker_flags(cv, builtin->checker, newSVuv(PTR2UV(builtin)), 0);
}
}
newXS_flags("builtin::import", &XS_builtin_import, __FILE__, NULL, 0);
}
/*
* ex: set ts=8 sts=4 sw=4 et:
*/
|
