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
|
/* You may distribute under the terms of either the GNU General Public License
* or the Artistic License (the same terms as Perl itself)
*
* (C) Paul Evans, 2021 -- leonerd@leonerd.org.uk
*/
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "XSParseSublike.h"
#include "perl-backcompat.c.inc"
#include "newOP_CUSTOM.c.inc"
struct MultiSubOption {
int args_min, args_max;
CV *cv;
};
#define get_optionsav(cv, padix) S_get_optionsav(aTHX_ cv, padix)
static AV *S_get_optionsav(pTHX_ CV *cv, PADOFFSET padix)
{
PADLIST *pl = CvPADLIST(cv);
AV *optionsav = (AV *)PadARRAY(PadlistARRAY(pl)[1])[padix];
return optionsav;
}
static OP *pp_dispatch_multisub(pTHX)
{
IV nargs = av_count(GvAV(PL_defgv));
CV *runcv = find_runcv(0);
AV *optionsav = get_optionsav(runcv, PL_op->op_targ);
CV *jumpcv = NULL;
IV noptions = av_count(optionsav);
IV optioni;
for(optioni = 0; optioni < noptions; optioni++) {
struct MultiSubOption *option = (struct MultiSubOption *)AvARRAY(optionsav)[optioni];
if(nargs < option->args_min)
continue;
if(option->args_max > -1 && nargs > option->args_max)
continue;
jumpcv = option->cv;
break;
}
if(!jumpcv)
croak("Unable to find a function body for a call to &%s::%s having %d arguments",
HvNAME(CvSTASH(runcv)), GvNAME(CvGV(runcv)), nargs);
/* Now pretend to be goto &$cv
* Reuse the same PL_op structure and just call that ppfunc */
assert(PL_op->op_flags & OPf_STACKED);
dSP;
mPUSHs(newRV_inc((SV *)jumpcv));
PUTBACK;
assert(SvROK(TOPs) && SvTYPE(SvRV(TOPs)) == SVt_PVCV);
return (PL_ppaddr[OP_GOTO])(aTHX);
}
/* XSParseSublikeContext moddata keys */
#define MODDATA_KEY_NAME "Syntax::Keyword::MultiSub/name"
#define MODDATA_KEY_COMPMULTICV "Syntax::Keyword::MultiSub/compmulticv"
static void parse_pre_subparse(pTHX_ struct XSParseSublikeContext *ctx, void *hookdata)
{
SV *name = ctx->name;
CV *multicv = get_cvn_flags(SvPVX(name), SvCUR(name), SvUTF8(name) ? SVf_UTF8 : 0);
if(!multicv) {
ENTER;
I32 floor_ix = start_subparse(FALSE, 0);
SAVEFREESV(PL_compcv);
I32 save_ix = block_start(TRUE);
PADOFFSET padix = pad_add_name_pvs("@(Syntax::Keyword::MultiSub/options)", 0, NULL, NULL);
intro_my();
OP *dispatchop = newOP_CUSTOM(&pp_dispatch_multisub, OPf_STACKED);
dispatchop->op_targ = padix;
OP *body = block_end(save_ix, dispatchop);
SvREFCNT_inc(PL_compcv);
multicv = newATTRSUB(floor_ix, newSVOP(OP_CONST, 0, SvREFCNT_inc(name)), NULL, NULL, body);
LEAVE;
}
hv_stores(ctx->moddata, MODDATA_KEY_NAME, SvREFCNT_inc(name));
hv_stores(ctx->moddata, MODDATA_KEY_COMPMULTICV, SvREFCNT_inc(multicv));
/* Do not let this sub be installed as a named symbol */
ctx->actions &= ~XS_PARSE_SUBLIKE_ACTION_INSTALL_SYMBOL;
}
static void parse_post_newcv(pTHX_ struct XSParseSublikeContext *ctx, void *hookdata)
{
CV *cv = ctx->cv;
if(!cv)
return;
SV *name = *hv_fetchs(ctx->moddata, MODDATA_KEY_NAME, 0);
CV *multicv = (CV *)*hv_fetchs(ctx->moddata, MODDATA_KEY_COMPMULTICV, 0);
PADNAMELIST *pln = PadlistNAMES(CvPADLIST(multicv));
/* We can't use pad_findmy_pvn() because it gets upset about seqnums */
PADOFFSET padix;
for(padix = 1; padix <= PadnamelistMAX(pln); padix++)
if(strEQ(PadnamePV(PadnamelistARRAY(pln)[padix]), "@(Syntax::Keyword::MultiSub/options)"))
break;
assert(padix <= PadnamelistMAX(pln));
AV *optionsav = get_optionsav(multicv, padix);
bool final_is_slurpy = av_count(optionsav) &&
(((struct MultiSubOption *)AvARRAY(optionsav)[AvFILL(optionsav)])->args_max == -1);
int args_min, args_max;
OP *o = CvSTART(cv);
while(o) {
redo:
switch(o->op_type) {
case OP_NEXTSTATE:
case OP_DBSTATE:
o = o->op_next;
goto redo;
case OP_ARGCHECK: {
#if HAVE_PERL_VERSION(5, 31, 5)
struct op_argcheck_aux *aux = (struct op_argcheck_aux *)cUNOP_AUXo->op_aux;
char slurpy = aux->slurpy;
args_max = aux->params;
args_min = args_max - aux->opt_params;
#else
UNOP_AUX_item *aux = cUNOP_AUXo->op_aux;
char slurpy = aux[2].iv;
args_max = aux[0].iv;
args_min = args_max - aux[1].iv;
#endif
if(slurpy) {
if(final_is_slurpy)
croak("Already have a slurpy function body for multi sub %" SVf, name);
args_max = -1;
}
goto done;
}
default:
croak("TODO: Unsure how to find argcheck op within %s", PL_op_name[o->op_type]);
}
}
done: ;
IV noptions = av_count(optionsav);
IV optioni;
for(optioni = 0; optioni < noptions; optioni++) {
struct MultiSubOption *option = (struct MultiSubOption *)AvARRAY(optionsav)[optioni];
if(option->args_max == -1 || args_min > option->args_max)
continue;
if(args_max < option->args_min)
continue;
croak("Ambiguous argument count for multi sub %" SVf, name);
}
struct MultiSubOption *option;
Newx(option, 1, struct MultiSubOption);
option->args_min = args_min;
option->args_max = args_max;
option->cv = cv_clone(cv); /* Because it is currently a protosub */
av_push(optionsav, (SV *)option);
}
static struct XSParseSublikeHooks hooks_multi = {
.permit_hintkey = "Syntax::Keyword::MultiSub/multi",
.flags = XS_PARSE_SUBLIKE_FLAG_PREFIX|XS_PARSE_SUBLIKE_COMPAT_FLAG_DYNAMIC_ACTIONS,
.require_parts = XS_PARSE_SUBLIKE_PART_NAME,
.pre_subparse = parse_pre_subparse,
.post_newcv = parse_post_newcv,
};
MODULE = Syntax::Keyword::MultiSub PACKAGE = Syntax::Keyword::MultiSub
BOOT:
boot_xs_parse_sublike(0.15);
register_xs_parse_sublike("multi", &hooks_multi, NULL);
|
