1 /* This file is part of the autovivification Perl module.
2 * See http://search.cpan.org/dist/autovivification/ */
3
4 #define PERL_NO_GET_CONTEXT
5 #include "EXTERN.h"
6 #include "perl.h"
7 #include "XSUB.h"
8
9 /* --- XS helpers ---------------------------------------------------------- */
10
11 #define XSH_PACKAGE "autovivification"
12
13 #include "xsh/caps.h"
14 #include "xsh/util.h"
15 #include "xsh/ops.h"
16 #include "xsh/peep.h"
17
18 /* ... Lexical hints ....................................................... */
19
20 /* Used both for hints and op flags */
21 #define A_HINT_STRICT 1
22 #define A_HINT_WARN 2
23 #define A_HINT_FETCH 4
24 #define A_HINT_STORE 8
25 #define A_HINT_KEYS 16
26 #define A_HINT_VALUES 32
27 #define A_HINT_EXISTS 64
28 #define A_HINT_DELETE 128
29 #define A_HINT_NOTIFY (A_HINT_STRICT|A_HINT_WARN)
30 #define A_HINT_DO (A_HINT_FETCH|A_HINT_STORE|A_HINT_KEYS|A_HINT_VALUES|A_HINT_EXISTS|A_HINT_DELETE)
31 #define A_HINT_MASK (A_HINT_NOTIFY|A_HINT_DO)
32
33 /* Only used in op flags */
34 #define A_HINT_ROOT 256
35 #define A_HINT_SECOND 512
36 #define A_HINT_DEREF 1024
37
38 #define XSH_HINTS_TYPE_UV 1
39
40 #include "xsh/hints.h"
41
42 #define a_hint() xsh_hints_detag(xsh_hints_fetch())
43
44 /* ... Thread-local storage ................................................ */
45
46 #define XSH_THREADS_COMPILE_TIME_PROTECTION 1
47 #define XSH_THREADS_USER_CONTEXT 0
48
49 #include "xsh/threads.h"
50
51 /* --- Compatibility wrappers ---------------------------------------------- */
52
53 #ifndef HvNAME_get
54 # define HvNAME_get(H) HvNAME(H)
55 #endif
56
57 #ifndef HvNAMELEN_get
58 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
59 #endif
60
61 #ifndef A_HAS_MULTIDEREF
62 # define A_HAS_MULTIDEREF XSH_HAS_PERL(5, 21, 7)
63 #endif
64
65 #ifndef A_HAS_SCALARKEYS_OPT
66 # define A_HAS_SCALARKEYS_OPT XSH_HAS_PERL(5, 27, 3)
67 #endif
68
69 /* ... Our vivify_ref() .................................................... */
70
71 /* Perl_vivify_ref() is not exported, so we have to reimplement it. */
72
73 #if A_HAS_MULTIDEREF
74
a_vivify_ref(pTHX_ SV * sv,int to_hash)75 static SV *a_vivify_ref(pTHX_ SV *sv, int to_hash) {
76 #define a_vivify_ref(S, TH) a_vivify_ref(aTHX_ (S), (TH))
77 SvGETMAGIC(sv);
78
79 if (!SvOK(sv)) {
80 SV *val;
81
82 if (SvREADONLY(sv))
83 Perl_croak_no_modify();
84
85 /* Inlined prepare_SV_for_RV() */
86 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) {
87 sv_upgrade(sv, SVt_IV);
88 } else if (SvTYPE(sv) >= SVt_PV) {
89 SvPV_free(sv);
90 SvLEN_set(sv, 0);
91 SvCUR_set(sv, 0);
92 }
93
94 val = to_hash ? MUTABLE_SV(newHV()) : MUTABLE_SV(newAV());
95 SvRV_set(sv, val);
96 SvROK_on(sv);
97 SvSETMAGIC(sv);
98 SvGETMAGIC(sv);
99 }
100
101 if (SvGMAGICAL(sv)) {
102 SV *msv = sv_newmortal();
103 sv_setsv_nomg(msv, sv);
104 return msv;
105 }
106
107 return sv;
108 }
109
110 #endif /* A_HAS_MULTIDEREF */
111
112 /* --- op => info map ------------------------------------------------------ */
113
114 typedef struct {
115 OP *(*old_pp)(pTHX);
116 void *next;
117 UV flags;
118 } a_op_info;
119
120 #define PTABLE_NAME ptable_map
121 #define PTABLE_VAL_FREE(V) XSH_SHARED_FREE((V), 1, a_op_info)
122 #define PTABLE_VAL_NEED_CONTEXT 0
123 #define PTABLE_NEED_DELETE 1
124 #define PTABLE_NEED_WALK 0
125
126 #include "xsh/ptable.h"
127
128 #define ptable_map_store(T, K, V) ptable_map_store(aPMS_ (T), (K), (V))
129 #define ptable_map_delete(T, K) ptable_map_delete(aPMS_ (T), (K))
130 #define ptable_map_free(T) ptable_map_free(aPMS_ (T))
131
132 static ptable *a_op_map = NULL;
133
134 #ifdef USE_ITHREADS
135
136 #define dA_MAP_THX a_op_info a_op_map_tmp_oi
137
138 static perl_mutex a_op_map_mutex;
139
a_map_fetch(const OP * o,a_op_info * oi)140 static const a_op_info *a_map_fetch(const OP *o, a_op_info *oi) {
141 const a_op_info *val;
142
143 XSH_LOCK(&a_op_map_mutex);
144
145 val = ptable_fetch(a_op_map, o);
146 if (val) {
147 *oi = *val;
148 val = oi;
149 }
150
151 XSH_UNLOCK(&a_op_map_mutex);
152
153 return val;
154 }
155
156 #define a_map_fetch(O) a_map_fetch((O), &a_op_map_tmp_oi)
157
158 #else /* USE_ITHREADS */
159
160 #define dA_MAP_THX dNOOP
161
162 #define a_map_fetch(O) ptable_fetch(a_op_map, (O))
163
164 #endif /* !USE_ITHREADS */
165
a_map_store_locked(pPMS_ const OP * o,OP * (* old_pp)(pTHX),void * next,UV flags)166 static const a_op_info *a_map_store_locked(pPMS_ const OP *o, OP *(*old_pp)(pTHX), void *next, UV flags) {
167 #define a_map_store_locked(O, PP, N, F) a_map_store_locked(aPMS_ (O), (PP), (N), (F))
168 a_op_info *oi;
169
170 if (!(oi = ptable_fetch(a_op_map, o))) {
171 XSH_SHARED_ALLOC(oi, 1, a_op_info);
172 ptable_map_store(a_op_map, o, oi);
173 }
174
175 oi->old_pp = old_pp;
176 oi->next = next;
177 oi->flags = flags;
178
179 return oi;
180 }
181
a_map_store(pTHX_ const OP * o,OP * (* old_pp)(pTHX),void * next,UV flags)182 static void a_map_store(pTHX_ const OP *o, OP *(*old_pp)(pTHX), void *next, UV flags) {
183 #define a_map_store(O, PP, N, F) a_map_store(aTHX_ (O), (PP), (N), (F))
184 XSH_LOCK(&a_op_map_mutex);
185
186 a_map_store_locked(o, old_pp, next, flags);
187
188 XSH_UNLOCK(&a_op_map_mutex);
189 }
190
a_map_delete(pTHX_ const OP * o)191 static void a_map_delete(pTHX_ const OP *o) {
192 #define a_map_delete(O) a_map_delete(aTHX_ (O))
193 XSH_LOCK(&a_op_map_mutex);
194
195 ptable_map_delete(a_op_map, o);
196
197 XSH_UNLOCK(&a_op_map_mutex);
198 }
199
a_map_descend(const OP * o)200 static const OP *a_map_descend(const OP *o) {
201 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
202 case OA_BASEOP:
203 case OA_UNOP:
204 case OA_BINOP:
205 case OA_BASEOP_OR_UNOP:
206 return cUNOPo->op_first;
207 case OA_LIST:
208 case OA_LISTOP:
209 return cLISTOPo->op_last;
210 }
211
212 return NULL;
213 }
214
a_map_store_root(pTHX_ const OP * root,OP * (* old_pp)(pTHX),UV flags)215 static void a_map_store_root(pTHX_ const OP *root, OP *(*old_pp)(pTHX), UV flags) {
216 #define a_map_store_root(R, PP, F) a_map_store_root(aTHX_ (R), (PP), (F))
217 const a_op_info *roi;
218 a_op_info *oi;
219 const OP *o = root;
220
221 XSH_LOCK(&a_op_map_mutex);
222
223 roi = a_map_store_locked(o, old_pp, (OP *) root, flags | A_HINT_ROOT);
224
225 while (o->op_flags & OPf_KIDS) {
226 o = a_map_descend(o);
227 if (!o)
228 break;
229 if ((oi = ptable_fetch(a_op_map, o))) {
230 oi->flags &= ~A_HINT_ROOT;
231 oi->next = (a_op_info *) roi;
232 break;
233 }
234 }
235
236 XSH_UNLOCK(&a_op_map_mutex);
237
238 return;
239 }
240
a_map_update_flags_topdown(const OP * root,UV mask,UV flags)241 static void a_map_update_flags_topdown(const OP *root, UV mask, UV flags) {
242 a_op_info *oi;
243 const OP *o = root;
244
245 XSH_LOCK(&a_op_map_mutex);
246
247 mask |= A_HINT_ROOT;
248 flags &= ~mask;
249
250 do {
251 if ((oi = ptable_fetch(a_op_map, o)))
252 oi->flags = (oi->flags & mask) | flags;
253 if (!(o->op_flags & OPf_KIDS))
254 break;
255 o = a_map_descend(o);
256 } while (o);
257
258 XSH_UNLOCK(&a_op_map_mutex);
259
260 return;
261 }
262
a_map_update_flags_bottomup(const OP * o,UV flags,UV rflags)263 static void a_map_update_flags_bottomup(const OP *o, UV flags, UV rflags) {
264 a_op_info *oi;
265
266 XSH_LOCK(&a_op_map_mutex);
267
268 flags &= ~A_HINT_ROOT;
269 rflags |= A_HINT_ROOT;
270
271 oi = ptable_fetch(a_op_map, o);
272 while (!(oi->flags & A_HINT_ROOT)) {
273 oi->flags = flags;
274 oi = oi->next;
275 }
276 oi->flags = rflags;
277
278 XSH_UNLOCK(&a_op_map_mutex);
279
280 return;
281 }
282
283 /* ... Decide whether this expression should be autovivified or not ........ */
284
a_map_resolve(const OP * o,const a_op_info * oi)285 static UV a_map_resolve(const OP *o, const a_op_info *oi) {
286 UV flags = 0, rflags;
287 const OP *root;
288 const a_op_info *roi = oi;
289
290 while (!(roi->flags & A_HINT_ROOT))
291 roi = roi->next;
292 if (!roi)
293 goto cancel;
294
295 rflags = roi->flags & ~A_HINT_ROOT;
296 if (!rflags)
297 goto cancel;
298
299 root = roi->next;
300 if (root->op_flags & OPf_MOD) {
301 if (rflags & A_HINT_STORE)
302 flags = (A_HINT_STORE|A_HINT_DEREF);
303 } else {
304 if (rflags & (A_HINT_FETCH|A_HINT_KEYS|A_HINT_VALUES))
305 flags = (rflags|A_HINT_DEREF);
306 }
307
308 if (!flags) {
309 cancel:
310 a_map_update_flags_bottomup(o, 0, 0);
311 return 0;
312 }
313
314 flags |= (rflags & A_HINT_NOTIFY);
315 a_map_update_flags_bottomup(o, flags, 0);
316
317 return oi->flags & A_HINT_ROOT ? 0 : flags;
318 }
319
320 /* ... Inspired from pp_defined() .......................................... */
321
a_undef(pTHX_ SV * sv)322 static int a_undef(pTHX_ SV *sv) {
323 #define a_undef(S) a_undef(aTHX_ (S))
324 switch (SvTYPE(sv)) {
325 case SVt_NULL:
326 return 1;
327 case SVt_PVAV:
328 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv)
329 || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
330 return 0;
331 break;
332 case SVt_PVHV:
333 if (HvARRAY(sv) || SvGMAGICAL(sv)
334 || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
335 return 0;
336 break;
337 default:
338 SvGETMAGIC(sv);
339 if (SvOK(sv))
340 return 0;
341 }
342
343 return 1;
344 }
345
346 /* --- PP functions -------------------------------------------------------- */
347
348 /* Be aware that we restore PL_op->op_ppaddr from the pointer table old_pp
349 * value, another extension might have saved our pp replacement as the ppaddr
350 * for this op, so this doesn't ensure that our function will never be called
351 * again. That's why we don't remove the op info from our map, so that it can
352 * still run correctly if required. */
353
354 /* ... pp_rv2av ............................................................ */
355
a_pp_rv2av(pTHX)356 static OP *a_pp_rv2av(pTHX) {
357 dA_MAP_THX;
358 const a_op_info *oi;
359 dSP;
360
361 oi = a_map_fetch(PL_op);
362
363 if (oi->flags & A_HINT_DEREF) {
364 if (a_undef(TOPs)) {
365 /* We always need to push an empty array to fool the pp_aelem() that comes
366 * later. */
367 SV *av;
368 (void) POPs;
369 av = sv_2mortal((SV *) newAV());
370 PUSHs(av);
371 RETURN;
372 }
373 }
374
375 return oi->old_pp(aTHX);
376 }
377
378 /* ... pp_rv2hv ............................................................ */
379
a_pp_rv2hv_simple(pTHX)380 static OP *a_pp_rv2hv_simple(pTHX) {
381 dA_MAP_THX;
382 const a_op_info *oi;
383 dSP;
384
385 oi = a_map_fetch(PL_op);
386
387 if (oi->flags & A_HINT_DEREF) {
388 if (a_undef(TOPs))
389 RETURN;
390 }
391
392 return oi->old_pp(aTHX);
393 }
394
a_pp_rv2hv(pTHX)395 static OP *a_pp_rv2hv(pTHX) {
396 dA_MAP_THX;
397 const a_op_info *oi;
398 dSP;
399
400 oi = a_map_fetch(PL_op);
401
402 if (oi->flags & A_HINT_DEREF) {
403 if (a_undef(TOPs)) {
404 SV *hv;
405 (void) POPs;
406 hv = sv_2mortal((SV *) newHV());
407 PUSHs(hv);
408 RETURN;
409 }
410 }
411
412 return oi->old_pp(aTHX);
413 }
414
415 #if A_HAS_SCALARKEYS_OPT
416
a_pp_rv2hv_dokeys(pTHX)417 static OP *a_pp_rv2hv_dokeys(pTHX) {
418 dA_MAP_THX;
419 const a_op_info *oi;
420 dSP;
421
422 oi = a_map_fetch(PL_op);
423
424 if (oi->flags & A_HINT_KEYS) {
425 if (a_undef(TOPs)) {
426 dTARGET;
427 (void) POPs;
428 PUSHi(0);
429 RETURN;
430 }
431 }
432
433 return oi->old_pp(aTHX);
434 }
435
436 #endif
437
438 /* ... pp_deref (aelem,helem,rv2sv,padsv) .................................. */
439
a_cannot_vivify(pTHX_ UV flags)440 static void a_cannot_vivify(pTHX_ UV flags) {
441 #define a_cannot_vivify(F) a_cannot_vivify(aTHX_ (F))
442 if (flags & A_HINT_STRICT)
443 croak("Reference vivification forbidden");
444 else if (flags & A_HINT_WARN)
445 warn("Reference was vivified");
446 else /* A_HINT_STORE */
447 croak("Can't vivify reference");
448 }
449
a_pp_deref(pTHX)450 static OP *a_pp_deref(pTHX) {
451 dA_MAP_THX;
452 const a_op_info *oi;
453 UV flags;
454 dSP;
455
456 oi = a_map_fetch(PL_op);
457
458 flags = oi->flags;
459 if (flags & A_HINT_DEREF) {
460 OP *o;
461
462 o = oi->old_pp(aTHX);
463
464 if (flags & (A_HINT_NOTIFY|A_HINT_STORE)) {
465 SPAGAIN;
466 if (a_undef(TOPs))
467 a_cannot_vivify(flags);
468 }
469
470 return o;
471 }
472
473 return oi->old_pp(aTHX);
474 }
475
476 /* ... pp_root (exists,delete,keys,values) ................................. */
477
a_pp_root_unop(pTHX)478 static OP *a_pp_root_unop(pTHX) {
479 dSP;
480
481 if (a_undef(TOPs)) {
482 (void) POPs;
483 /* Can only be reached by keys or values */
484 if (GIMME_V == G_SCALAR) {
485 dTARGET;
486 PUSHi(0);
487 }
488 RETURN;
489 }
490
491 {
492 dA_MAP_THX;
493 const a_op_info *oi = a_map_fetch(PL_op);
494 return oi->old_pp(aTHX);
495 }
496 }
497
a_pp_root_binop(pTHX)498 static OP *a_pp_root_binop(pTHX) {
499 dSP;
500
501 if (a_undef(TOPm1s)) {
502 (void) POPs;
503 (void) POPs;
504 if (PL_op->op_type == OP_EXISTS)
505 RETPUSHNO;
506 else
507 RETPUSHUNDEF;
508 }
509
510 {
511 dA_MAP_THX;
512 const a_op_info *oi = a_map_fetch(PL_op);
513 return oi->old_pp(aTHX);
514 }
515 }
516
517 #if A_HAS_MULTIDEREF
518
519 /* ... pp_multideref ....................................................... */
520
521 /* This pp replacement is actually only called for topmost exists/delete ops,
522 * because we hijack the [ah]elem check functions and this disables the
523 * optimization for lvalue and rvalue dereferencing. In particular, the
524 * OPf_MOD branches should never be covered. In the future, the multideref
525 * optimization might also be disabled for custom exists/delete check functions,
526 * which will make this section unnecessary. However, the code tries to be as
527 * general as possible in case I think of a way to reenable the multideref
528 * optimization even when this module is in use. */
529
a_do_multideref(const OP * o,UV flags)530 static UV a_do_multideref(const OP *o, UV flags) {
531 UV isexdel, other_flags;
532
533 XSH_ASSERT(o->op_type == OP_MULTIDEREF);
534
535 other_flags = flags & ~A_HINT_DO;
536
537 isexdel = o->op_private & (OPpMULTIDEREF_EXISTS|OPpMULTIDEREF_DELETE);
538 if (isexdel) {
539 if (isexdel & OPpMULTIDEREF_EXISTS) {
540 flags &= A_HINT_EXISTS;
541 } else {
542 flags &= A_HINT_DELETE;
543 }
544 } else {
545 if (o->op_flags & OPf_MOD) {
546 flags &= A_HINT_STORE;
547 } else {
548 flags &= A_HINT_FETCH;
549 }
550 }
551
552 return flags ? (flags | other_flags) : 0;
553 }
554
a_do_fake_pp(pTHX_ OP * op)555 static SV *a_do_fake_pp(pTHX_ OP *op) {
556 #define a_do_fake_pp(O) a_do_fake_pp(aTHX_ (O))
557 {
558 OP *o = PL_op;
559 ENTER;
560 SAVEOP();
561 PL_op = op;
562 PL_op->op_ppaddr(aTHX);
563 PL_op = o;
564 LEAVE;
565 }
566
567 {
568 SV *ret;
569 dSP;
570 ret = POPs;
571 PUTBACK;
572 return ret;
573 }
574 }
575
a_do_fake_pp_unop_init(pTHX_ UNOP * unop,U32 type,U32 flags)576 static void a_do_fake_pp_unop_init(pTHX_ UNOP *unop, U32 type, U32 flags) {
577 #define a_do_fake_pp_unop_init(O, T, F) a_do_fake_pp_unop_init(aTHX_ (O), (T), (F))
578 unop->op_type = type;
579 unop->op_flags = OPf_WANT_SCALAR | (~OPf_WANT & flags);
580 unop->op_private = 0;
581 unop->op_first = NULL;
582 unop->op_ppaddr = PL_ppaddr[type];
583 }
584
a_do_fake_pp_unop_arg1(pTHX_ U32 type,U32 flags,SV * arg)585 static SV *a_do_fake_pp_unop_arg1(pTHX_ U32 type, U32 flags, SV *arg) {
586 #define a_do_fake_pp_unop_arg1(T, F, A) a_do_fake_pp_unop_arg1(aTHX_ (T), (F), (A))
587 UNOP unop;
588 dSP;
589
590 a_do_fake_pp_unop_init(&unop, type, flags);
591
592 EXTEND(SP, 1);
593 PUSHs(arg);
594 PUTBACK;
595
596 return a_do_fake_pp((OP *) &unop);
597 }
598
a_do_fake_pp_unop_arg2(pTHX_ U32 type,U32 flags,SV * arg1,SV * arg2)599 static SV *a_do_fake_pp_unop_arg2(pTHX_ U32 type, U32 flags, SV *arg1, SV *arg2) {
600 #define a_do_fake_pp_unop_arg2(T, F, A1, A2) a_do_fake_pp_unop_arg2(aTHX_ (T), (F), (A1), (A2))
601 UNOP unop;
602 dSP;
603
604 a_do_fake_pp_unop_init(&unop, type, flags);
605
606 EXTEND(SP, 2);
607 PUSHs(arg1);
608 PUSHs(arg2);
609 PUTBACK;
610
611 return a_do_fake_pp((OP *) &unop);
612 }
613
614 #define a_do_pp_rv2av(R) a_do_fake_pp_unop_arg1(OP_RV2AV, OPf_REF, (R))
615 #define a_do_pp_afetch(A, I) a_do_fake_pp_unop_arg2(OP_AELEM, 0, (A), (I))
616 #define a_do_pp_afetch_lv(A, I) a_do_fake_pp_unop_arg2(OP_AELEM, OPf_MOD, (A), (I))
617 #define a_do_pp_aexists(A, I) a_do_fake_pp_unop_arg2(OP_EXISTS, OPf_SPECIAL, (A), (I))
618 #define a_do_pp_adelete(A, I) a_do_fake_pp_unop_arg2(OP_DELETE, OPf_SPECIAL, (A), (I))
619
620 #define a_do_pp_rv2hv(R) a_do_fake_pp_unop_arg1(OP_RV2HV, OPf_REF, (R))
621 #define a_do_pp_hfetch(H, K) a_do_fake_pp_unop_arg2(OP_HELEM, 0, (H), (K))
622 #define a_do_pp_hfetch_lv(H, K) a_do_fake_pp_unop_arg2(OP_HELEM, OPf_MOD, (H), (K))
623 #define a_do_pp_hexists(H, K) a_do_fake_pp_unop_arg2(OP_EXISTS, 0, (H), (K))
624 #define a_do_pp_hdelete(H, K) a_do_fake_pp_unop_arg2(OP_DELETE, 0, (H), (K))
625
a_pp_multideref(pTHX)626 static OP *a_pp_multideref(pTHX) {
627 UNOP_AUX_item *items;
628 UV actions;
629 UV flags = 0;
630 SV *sv = NULL;
631 dSP;
632
633 {
634 dA_MAP_THX;
635 const a_op_info *oi = a_map_fetch(PL_op);
636 XSH_ASSERT(oi);
637 flags = a_do_multideref(PL_op, oi->flags);
638 if (!flags)
639 return oi->old_pp(aTHX);
640 }
641
642 items = cUNOP_AUXx(PL_op)->op_aux;
643 actions = items->uv;
644
645 PL_multideref_pc = items;
646
647 while (1) {
648 switch (actions & MDEREF_ACTION_MASK) {
649 case MDEREF_reload:
650 actions = (++items)->uv;
651 continue;
652 case MDEREF_AV_padav_aelem: /* $lex[...] */
653 sv = PAD_SVl((++items)->pad_offset);
654 if (a_undef(sv))
655 goto ret_undef;
656 goto do_AV_aelem;
657 case MDEREF_AV_gvav_aelem: /* $pkg[...] */
658 sv = UNOP_AUX_item_sv(++items);
659 XSH_ASSERT(isGV_with_GP(sv));
660 sv = (SV *) GvAVn((GV *) sv);
661 if (a_undef(sv))
662 goto ret_undef;
663 goto do_AV_aelem;
664 case MDEREF_AV_pop_rv2av_aelem: /* expr->[...] */
665 sv = POPs;
666 if (a_undef(sv))
667 goto ret_undef;
668 goto do_AV_rv2av_aelem;
669 case MDEREF_AV_gvsv_vivify_rv2av_aelem: /* $pkg->[...] */
670 sv = UNOP_AUX_item_sv(++items);
671 XSH_ASSERT(isGV_with_GP(sv));
672 sv = GvSVn((GV *) sv);
673 if (a_undef(sv))
674 goto ret_undef;
675 goto do_AV_vivify_rv2av_aelem;
676 case MDEREF_AV_padsv_vivify_rv2av_aelem: /* $lex->[...] */
677 sv = PAD_SVl((++items)->pad_offset);
678 /* FALLTHROUGH */
679 case MDEREF_AV_vivify_rv2av_aelem: /* vivify, ->[...] */
680 if (a_undef(sv))
681 goto ret_undef;
682 do_AV_vivify_rv2av_aelem:
683 sv = a_vivify_ref(sv, 0);
684 do_AV_rv2av_aelem:
685 sv = a_do_pp_rv2av(sv);
686 do_AV_aelem:
687 {
688 SV *esv;
689 XSH_ASSERT(SvTYPE(sv) == SVt_PVAV);
690 switch (actions & MDEREF_INDEX_MASK) {
691 case MDEREF_INDEX_none:
692 goto finish;
693 case MDEREF_INDEX_const:
694 esv = sv_2mortal(newSViv((++items)->iv));
695 break;
696 case MDEREF_INDEX_padsv:
697 esv = PAD_SVl((++items)->pad_offset);
698 goto check_elem;
699 case MDEREF_INDEX_gvsv:
700 esv = UNOP_AUX_item_sv(++items);
701 XSH_ASSERT(isGV_with_GP(esv));
702 esv = GvSVn((GV *) esv);
703 check_elem:
704 if (UNLIKELY(SvROK(esv) && !SvGAMAGIC(esv) && ckWARN(WARN_MISC)))
705 Perl_warner(aTHX_ packWARN(WARN_MISC),
706 "Use of reference \"%"SVf"\" as array index",
707 SVfARG(esv));
708 break;
709 }
710 PL_multideref_pc = items;
711 if (actions & MDEREF_FLAG_last) {
712 switch (flags & A_HINT_DO) {
713 case A_HINT_FETCH:
714 sv = a_do_pp_afetch(sv, esv);
715 break;
716 case A_HINT_STORE:
717 sv = a_do_pp_afetch_lv(sv, esv);
718 break;
719 case A_HINT_EXISTS:
720 sv = a_do_pp_aexists(sv, esv);
721 break;
722 case A_HINT_DELETE:
723 sv = a_do_pp_adelete(sv, esv);
724 break;
725 }
726 goto finish;
727 }
728 sv = a_do_pp_afetch(sv, esv);
729 break;
730 }
731 case MDEREF_HV_padhv_helem: /* $lex{...} */
732 sv = PAD_SVl((++items)->pad_offset);
733 if (a_undef(sv))
734 goto ret_undef;
735 goto do_HV_helem;
736 case MDEREF_HV_gvhv_helem: /* $pkg{...} */
737 sv = UNOP_AUX_item_sv(++items);
738 XSH_ASSERT(isGV_with_GP(sv));
739 sv = (SV *) GvHVn((GV *) sv);
740 if (a_undef(sv))
741 goto ret_undef;
742 goto do_HV_helem;
743 case MDEREF_HV_pop_rv2hv_helem: /* expr->{...} */
744 sv = POPs;
745 if (a_undef(sv))
746 goto ret_undef;
747 goto do_HV_rv2hv_helem;
748 case MDEREF_HV_gvsv_vivify_rv2hv_helem: /* $pkg->{...} */
749 sv = UNOP_AUX_item_sv(++items);
750 XSH_ASSERT(isGV_with_GP(sv));
751 sv = GvSVn((GV *) sv);
752 if (a_undef(sv))
753 goto ret_undef;
754 goto do_HV_vivify_rv2hv_helem;
755 case MDEREF_HV_padsv_vivify_rv2hv_helem: /* $lex->{...} */
756 sv = PAD_SVl((++items)->pad_offset);
757 /* FALLTHROUGH */
758 case MDEREF_HV_vivify_rv2hv_helem: /* vivify, ->{...} */
759 if (a_undef(sv))
760 goto ret_undef;
761 do_HV_vivify_rv2hv_helem:
762 sv = a_vivify_ref(sv, 1);
763 do_HV_rv2hv_helem:
764 sv = a_do_pp_rv2hv(sv);
765 do_HV_helem:
766 {
767 SV *key;
768 XSH_ASSERT(SvTYPE(sv) == SVt_PVHV);
769 switch (actions & MDEREF_INDEX_MASK) {
770 case MDEREF_INDEX_none:
771 goto finish;
772 case MDEREF_INDEX_const:
773 key = UNOP_AUX_item_sv(++items);
774 break;
775 case MDEREF_INDEX_padsv:
776 key = PAD_SVl((++items)->pad_offset);
777 break;
778 case MDEREF_INDEX_gvsv:
779 key = UNOP_AUX_item_sv(++items);
780 XSH_ASSERT(isGV_with_GP(key));
781 key = GvSVn((GV *) key);
782 break;
783 }
784 PL_multideref_pc = items;
785 if (actions & MDEREF_FLAG_last) {
786 switch (flags & A_HINT_DO) {
787 case A_HINT_FETCH:
788 sv = a_do_pp_hfetch(sv, key);
789 break;
790 case A_HINT_STORE:
791 sv = a_do_pp_hfetch_lv(sv, key);
792 break;
793 case A_HINT_EXISTS:
794 sv = a_do_pp_hexists(sv, key);
795 break;
796 case A_HINT_DELETE:
797 sv = a_do_pp_hdelete(sv, key);
798 break;
799 default:
800 break;
801 }
802 goto finish;
803 }
804 sv = a_do_pp_hfetch(sv, key);
805 break;
806 }
807 }
808
809 actions >>= MDEREF_SHIFT;
810 }
811
812 ret_undef:
813 if (flags & (A_HINT_NOTIFY|A_HINT_STORE))
814 a_cannot_vivify(flags);
815 if (flags & A_HINT_EXISTS)
816 sv = &PL_sv_no;
817 else
818 sv = &PL_sv_undef;
819 finish:
820 XPUSHs(sv);
821 RETURN;
822 }
823
824 #endif /* A_HAS_MULTIDEREF */
825
826 /* --- Check functions ----------------------------------------------------- */
827
a_recheck_rv2xv(pTHX_ OP * o,OPCODE type,OP * (* new_pp)(pTHX))828 static void a_recheck_rv2xv(pTHX_ OP *o, OPCODE type, OP *(*new_pp)(pTHX)) {
829 #define a_recheck_rv2xv(O, T, PP) a_recheck_rv2xv(aTHX_ (O), (T), (PP))
830
831 if (o->op_type == type && o->op_ppaddr != new_pp
832 && cUNOPo->op_first->op_type != OP_GV) {
833 dA_MAP_THX;
834 const a_op_info *oi = a_map_fetch(o);
835 if (oi) {
836 a_map_store(o, o->op_ppaddr, oi->next, oi->flags);
837 o->op_ppaddr = new_pp;
838 }
839 }
840
841 return;
842 }
843
844 /* ... ck_pad{any,sv} ...................................................... */
845
846 /* Sadly, the padsv OPs we are interested in don't trigger the padsv check
847 * function, but are instead manually mutated from a padany. So we store
848 * the op entry in the op map in the padany check function, and we set their
849 * op_ppaddr member in our peephole optimizer replacement below. */
850
851 static OP *(*a_old_ck_padany)(pTHX_ OP *) = 0;
852
a_ck_padany(pTHX_ OP * o)853 static OP *a_ck_padany(pTHX_ OP *o) {
854 UV hint;
855
856 o = a_old_ck_padany(aTHX_ o);
857
858 hint = a_hint();
859 if (hint & A_HINT_DO)
860 a_map_store_root(o, o->op_ppaddr, hint);
861 else
862 a_map_delete(o);
863
864 return o;
865 }
866
867 static OP *(*a_old_ck_padsv)(pTHX_ OP *) = 0;
868
a_ck_padsv(pTHX_ OP * o)869 static OP *a_ck_padsv(pTHX_ OP *o) {
870 UV hint;
871
872 o = a_old_ck_padsv(aTHX_ o);
873
874 hint = a_hint();
875 if (hint & A_HINT_DO) {
876 a_map_store_root(o, o->op_ppaddr, hint);
877 o->op_ppaddr = a_pp_deref;
878 } else
879 a_map_delete(o);
880
881 return o;
882 }
883
884 /* ... ck_deref (aelem,helem,rv2sv) ........................................ */
885
886 /* Those ops appear both at the root and inside an expression but there's no
887 * way to distinguish both situations. Worse, we can't even know if we are in a
888 * modifying context, so the expression can't be resolved yet. It will be at the
889 * first invocation of a_pp_deref() for this expression. */
890
891 static OP *(*a_old_ck_aelem)(pTHX_ OP *) = 0;
892 static OP *(*a_old_ck_helem)(pTHX_ OP *) = 0;
893 static OP *(*a_old_ck_rv2sv)(pTHX_ OP *) = 0;
894
a_ck_deref(pTHX_ OP * o)895 static OP *a_ck_deref(pTHX_ OP *o) {
896 OP * (*old_ck)(pTHX_ OP *o) = 0;
897 UV hint = a_hint();
898
899 switch (o->op_type) {
900 case OP_AELEM:
901 old_ck = a_old_ck_aelem;
902 if ((hint & A_HINT_DO) && !(hint & A_HINT_STRICT))
903 a_recheck_rv2xv(cUNOPo->op_first, OP_RV2AV, a_pp_rv2av);
904 break;
905 case OP_HELEM:
906 old_ck = a_old_ck_helem;
907 if ((hint & A_HINT_DO) && !(hint & A_HINT_STRICT))
908 a_recheck_rv2xv(cUNOPo->op_first, OP_RV2HV, a_pp_rv2hv_simple);
909 break;
910 case OP_RV2SV:
911 old_ck = a_old_ck_rv2sv;
912 break;
913 }
914 o = old_ck(aTHX_ o);
915
916 #if A_HAS_MULTIDEREF
917 if (old_ck == a_old_ck_rv2sv && o->op_flags & OPf_KIDS) {
918 OP *kid = cUNOPo->op_first;
919 if (kid && kid->op_type == OP_GV) {
920 if (hint & A_HINT_DO)
921 a_map_store(kid, kid->op_ppaddr, NULL, hint);
922 else
923 a_map_delete(kid);
924 }
925 }
926 #endif
927
928 if (hint & A_HINT_DO) {
929 a_map_store_root(o, o->op_ppaddr, hint);
930 o->op_ppaddr = a_pp_deref;
931 } else
932 a_map_delete(o);
933
934 return o;
935 }
936
937 /* ... ck_rv2xv (rv2av,rv2hv) .............................................. */
938
939 /* Those ops also appear both inisde and at the root, hence the caveats for
940 * a_ck_deref() still apply here. Since a padsv/rv2sv must appear before a
941 * rv2[ah]v, resolution is handled by the first call to a_pp_deref() in the
942 * expression. */
943
944 static OP *(*a_old_ck_rv2av)(pTHX_ OP *) = 0;
945 static OP *(*a_old_ck_rv2hv)(pTHX_ OP *) = 0;
946
a_ck_rv2xv(pTHX_ OP * o)947 static OP *a_ck_rv2xv(pTHX_ OP *o) {
948 OP * (*old_ck)(pTHX_ OP *o) = 0;
949 OP * (*new_pp)(pTHX) = 0;
950 UV hint;
951
952 switch (o->op_type) {
953 case OP_RV2AV: old_ck = a_old_ck_rv2av; new_pp = a_pp_rv2av; break;
954 case OP_RV2HV: old_ck = a_old_ck_rv2hv; new_pp = a_pp_rv2hv_simple; break;
955 }
956 o = old_ck(aTHX_ o);
957
958 if (cUNOPo->op_first->op_type == OP_GV)
959 return o;
960
961 hint = a_hint();
962 if (hint & A_HINT_DO && !(hint & A_HINT_STRICT)) {
963 a_map_store_root(o, o->op_ppaddr, hint);
964 o->op_ppaddr = new_pp;
965 } else
966 a_map_delete(o);
967
968 return o;
969 }
970
971 /* ... ck_xslice (aslice,hslice) ........................................... */
972
973 /* I think those are only found at the root, but there's nothing that really
974 * prevent them to be inside the expression too. We only need to update the
975 * root so that the rest of the expression will see the right context when
976 * resolving. That's why we don't replace the ppaddr. */
977
978 static OP *(*a_old_ck_aslice)(pTHX_ OP *) = 0;
979 static OP *(*a_old_ck_hslice)(pTHX_ OP *) = 0;
980
a_ck_xslice(pTHX_ OP * o)981 static OP *a_ck_xslice(pTHX_ OP *o) {
982 OP * (*old_ck)(pTHX_ OP *o) = 0;
983 UV hint = a_hint();
984
985 switch (o->op_type) {
986 case OP_ASLICE:
987 old_ck = a_old_ck_aslice;
988 break;
989 case OP_HSLICE:
990 old_ck = a_old_ck_hslice;
991 if (hint & A_HINT_DO)
992 a_recheck_rv2xv(OpSIBLING(cUNOPo->op_first), OP_RV2HV, a_pp_rv2hv);
993 break;
994 }
995 o = old_ck(aTHX_ o);
996
997 if (hint & A_HINT_DO) {
998 a_map_store_root(o, 0, hint);
999 } else
1000 a_map_delete(o);
1001
1002 return o;
1003 }
1004
1005 /* ... ck_root (exists,delete,keys,values) ................................. */
1006
1007 /* Those ops are only found at the root of a dereferencing expression. We can
1008 * then resolve at compile time if vivification must take place or not. */
1009
1010 static OP *(*a_old_ck_exists)(pTHX_ OP *) = 0;
1011 static OP *(*a_old_ck_delete)(pTHX_ OP *) = 0;
1012 static OP *(*a_old_ck_keys) (pTHX_ OP *) = 0;
1013 static OP *(*a_old_ck_values)(pTHX_ OP *) = 0;
1014
a_ck_root(pTHX_ OP * o)1015 static OP *a_ck_root(pTHX_ OP *o) {
1016 OP * (*old_ck)(pTHX_ OP *o) = 0;
1017 OP * (*new_pp)(pTHX) = 0;
1018 int enabled = 0;
1019 UV hint = a_hint();
1020
1021 switch (o->op_type) {
1022 case OP_EXISTS:
1023 old_ck = a_old_ck_exists;
1024 new_pp = a_pp_root_binop;
1025 enabled = hint & A_HINT_EXISTS;
1026 break;
1027 case OP_DELETE:
1028 old_ck = a_old_ck_delete;
1029 new_pp = a_pp_root_binop;
1030 enabled = hint & A_HINT_DELETE;
1031 break;
1032 case OP_KEYS:
1033 old_ck = a_old_ck_keys;
1034 new_pp = a_pp_root_unop;
1035 enabled = hint & A_HINT_KEYS;
1036 break;
1037 case OP_VALUES:
1038 old_ck = a_old_ck_values;
1039 new_pp = a_pp_root_unop;
1040 enabled = hint & A_HINT_VALUES;
1041 break;
1042 }
1043 o = old_ck(aTHX_ o);
1044
1045 if (hint & A_HINT_DO) {
1046 if (enabled) {
1047 #if A_HAS_SCALARKEYS_OPT
1048 if ((enabled == A_HINT_KEYS) && (o->op_flags & OPf_KIDS)) {
1049 OP *kid = cUNOPo->op_first;
1050 if (kid->op_type == OP_RV2HV) {
1051 dA_MAP_THX;
1052 const a_op_info *koi = a_map_fetch(kid);
1053 a_map_store(kid, koi ? koi->old_pp : kid->op_ppaddr, NULL,
1054 hint | A_HINT_SECOND);
1055 if (!koi)
1056 kid->op_ppaddr = a_pp_rv2hv;
1057 }
1058 }
1059 #endif
1060 a_map_update_flags_topdown(o, A_HINT_SECOND, hint | A_HINT_DEREF);
1061 a_map_store_root(o, o->op_ppaddr, hint);
1062 o->op_ppaddr = new_pp;
1063 } else {
1064 a_map_update_flags_topdown(o, 0, 0);
1065 }
1066 } else
1067 a_map_delete(o);
1068
1069 return o;
1070 }
1071
1072 /* --- Our peephole optimizer ---------------------------------------------- */
1073
xsh_peep_rec(pTHX_ OP * o,ptable * seen)1074 static void xsh_peep_rec(pTHX_ OP *o, ptable *seen) {
1075 for (; o; o = o->op_next) {
1076 dA_MAP_THX;
1077 const a_op_info *oi = NULL;
1078 UV flags = 0;
1079
1080 if (xsh_peep_seen(o, seen))
1081 break;
1082
1083 switch (o->op_type) {
1084 case OP_PADSV:
1085 if (o->op_ppaddr != a_pp_deref) {
1086 oi = a_map_fetch(o);
1087 if (oi && (oi->flags & A_HINT_DO)) {
1088 a_map_store(o, o->op_ppaddr, oi->next, oi->flags);
1089 o->op_ppaddr = a_pp_deref;
1090 }
1091 }
1092 /* FALLTHROUGH */
1093 case OP_AELEM:
1094 case OP_AELEMFAST:
1095 case OP_HELEM:
1096 case OP_RV2SV:
1097 if (o->op_ppaddr != a_pp_deref)
1098 break;
1099 oi = a_map_fetch(o);
1100 if (!oi)
1101 break;
1102 flags = oi->flags;
1103 if (!(flags & A_HINT_DEREF)
1104 && (flags & A_HINT_DO)
1105 && (o->op_private & OPpDEREF || flags & A_HINT_ROOT)) {
1106 /* Decide if the expression must autovivify or not. */
1107 flags = a_map_resolve(o, oi);
1108 }
1109 if (flags & A_HINT_DEREF)
1110 o->op_private = ((o->op_private & ~OPpDEREF) | OPpLVAL_DEFER);
1111 else
1112 o->op_ppaddr = oi->old_pp;
1113 break;
1114 case OP_RV2AV:
1115 if (o->op_ppaddr != a_pp_rv2av)
1116 break;
1117 oi = a_map_fetch(o);
1118 if (!oi)
1119 break;
1120 if (!(oi->flags & A_HINT_DEREF))
1121 o->op_ppaddr = oi->old_pp;
1122 break;
1123 case OP_RV2HV:
1124 if (o->op_ppaddr != a_pp_rv2hv && o->op_ppaddr != a_pp_rv2hv_simple)
1125 break;
1126 oi = a_map_fetch(o);
1127 if (!oi)
1128 break;
1129 if (!(oi->flags & A_HINT_DEREF)) {
1130 o->op_ppaddr = oi->old_pp;
1131 break;
1132 }
1133 #if A_HAS_SCALARKEYS_OPT
1134 flags = oi->flags;
1135 if ((flags & A_HINT_KEYS) && (flags & A_HINT_SECOND)) {
1136 U8 want = o->op_flags & OPf_WANT;
1137 if (want == OPf_WANT_VOID || want == OPf_WANT_SCALAR)
1138 o->op_ppaddr = a_pp_rv2hv_dokeys;
1139 else if (oi->old_pp == a_pp_rv2hv || oi->old_pp == a_pp_rv2hv_simple)
1140 o->op_ppaddr = oi->old_pp;
1141 }
1142 #endif
1143 break;
1144 #if A_HAS_MULTIDEREF
1145 case OP_MULTIDEREF:
1146 if (o->op_ppaddr != a_pp_multideref) {
1147 oi = a_map_fetch(cUNOPo->op_first);
1148 if (!oi)
1149 break;
1150 flags = oi->flags;
1151 if (a_do_multideref(o, flags)) {
1152 a_map_store_root(o, o->op_ppaddr, flags & ~A_HINT_DEREF);
1153 o->op_ppaddr = a_pp_multideref;
1154 }
1155 }
1156 break;
1157 #endif
1158 default:
1159 xsh_peep_maybe_recurse(o, seen);
1160 break;
1161 }
1162 }
1163 }
1164
1165 /* --- Module setup/teardown ----------------------------------------------- */
1166
xsh_user_global_setup(pTHX)1167 static void xsh_user_global_setup(pTHX) {
1168 a_op_map = ptable_new(32);
1169
1170 #ifdef USE_ITHREADS
1171 MUTEX_INIT(&a_op_map_mutex);
1172 #endif
1173
1174 xsh_ck_replace(OP_PADANY, a_ck_padany, &a_old_ck_padany);
1175 xsh_ck_replace(OP_PADSV, a_ck_padsv, &a_old_ck_padsv);
1176
1177 xsh_ck_replace(OP_AELEM, a_ck_deref, &a_old_ck_aelem);
1178 xsh_ck_replace(OP_HELEM, a_ck_deref, &a_old_ck_helem);
1179 xsh_ck_replace(OP_RV2SV, a_ck_deref, &a_old_ck_rv2sv);
1180
1181 xsh_ck_replace(OP_RV2AV, a_ck_rv2xv, &a_old_ck_rv2av);
1182 xsh_ck_replace(OP_RV2HV, a_ck_rv2xv, &a_old_ck_rv2hv);
1183
1184 xsh_ck_replace(OP_ASLICE, a_ck_xslice, &a_old_ck_aslice);
1185 xsh_ck_replace(OP_HSLICE, a_ck_xslice, &a_old_ck_hslice);
1186
1187 xsh_ck_replace(OP_EXISTS, a_ck_root, &a_old_ck_exists);
1188 xsh_ck_replace(OP_DELETE, a_ck_root, &a_old_ck_delete);
1189 xsh_ck_replace(OP_KEYS, a_ck_root, &a_old_ck_keys);
1190 xsh_ck_replace(OP_VALUES, a_ck_root, &a_old_ck_values);
1191
1192 return;
1193 }
1194
xsh_user_local_setup(pTHX)1195 static void xsh_user_local_setup(pTHX) {
1196 HV *stash;
1197
1198 stash = gv_stashpvn(XSH_PACKAGE, XSH_PACKAGE_LEN, 1);
1199 newCONSTSUB(stash, "A_HINT_STRICT", newSVuv(A_HINT_STRICT));
1200 newCONSTSUB(stash, "A_HINT_WARN", newSVuv(A_HINT_WARN));
1201 newCONSTSUB(stash, "A_HINT_FETCH", newSVuv(A_HINT_FETCH));
1202 newCONSTSUB(stash, "A_HINT_STORE", newSVuv(A_HINT_STORE));
1203 newCONSTSUB(stash, "A_HINT_KEYS", newSVuv(A_HINT_KEYS));
1204 newCONSTSUB(stash, "A_HINT_VALUES", newSVuv(A_HINT_VALUES));
1205 newCONSTSUB(stash, "A_HINT_EXISTS", newSVuv(A_HINT_EXISTS));
1206 newCONSTSUB(stash, "A_HINT_DELETE", newSVuv(A_HINT_DELETE));
1207 newCONSTSUB(stash, "A_HINT_MASK", newSVuv(A_HINT_MASK));
1208 newCONSTSUB(stash, "A_THREADSAFE", newSVuv(XSH_THREADSAFE));
1209 newCONSTSUB(stash, "A_FORKSAFE", newSVuv(XSH_FORKSAFE));
1210
1211 return;
1212 }
1213
xsh_user_local_teardown(pTHX)1214 static void xsh_user_local_teardown(pTHX) {
1215 return;
1216 }
1217
xsh_user_global_teardown(pTHX)1218 static void xsh_user_global_teardown(pTHX) {
1219 xsh_ck_restore(OP_PADANY, &a_old_ck_padany);
1220 xsh_ck_restore(OP_PADSV, &a_old_ck_padsv);
1221
1222 xsh_ck_restore(OP_AELEM, &a_old_ck_aelem);
1223 xsh_ck_restore(OP_HELEM, &a_old_ck_helem);
1224 xsh_ck_restore(OP_RV2SV, &a_old_ck_rv2sv);
1225
1226 xsh_ck_restore(OP_RV2AV, &a_old_ck_rv2av);
1227 xsh_ck_restore(OP_RV2HV, &a_old_ck_rv2hv);
1228
1229 xsh_ck_restore(OP_ASLICE, &a_old_ck_aslice);
1230 xsh_ck_restore(OP_HSLICE, &a_old_ck_hslice);
1231
1232 xsh_ck_restore(OP_EXISTS, &a_old_ck_exists);
1233 xsh_ck_restore(OP_DELETE, &a_old_ck_delete);
1234 xsh_ck_restore(OP_KEYS, &a_old_ck_keys);
1235 xsh_ck_restore(OP_VALUES, &a_old_ck_values);
1236
1237 ptable_map_free(a_op_map);
1238 a_op_map = NULL;
1239
1240 #ifdef USE_ITHREADS
1241 MUTEX_DESTROY(&a_op_map_mutex);
1242 #endif
1243
1244 return;
1245 }
1246
1247 /* --- XS ------------------------------------------------------------------ */
1248
1249 MODULE = autovivification PACKAGE = autovivification
1250
1251 PROTOTYPES: ENABLE
1252
1253 BOOT:
1254 {
1255 xsh_setup();
1256 }
1257
1258 #if XSH_THREADSAFE
1259
1260 void
1261 CLONE(...)
1262 PROTOTYPE: DISABLE
1263 PPCODE:
1264 xsh_clone();
1265 XSRETURN(0);
1266
1267 #endif /* XSH_THREADSAFE */
1268
1269 SV *
1270 _tag(SV *hint)
1271 PROTOTYPE: $
1272 CODE:
1273 RETVAL = xsh_hints_tag(SvOK(hint) ? SvUV(hint) : 0);
1274 OUTPUT:
1275 RETVAL
1276
1277 SV *
1278 _detag(SV *tag)
1279 PROTOTYPE: $
1280 CODE:
1281 if (!SvOK(tag))
1282 XSRETURN_UNDEF;
1283 RETVAL = newSVuv(xsh_hints_detag(tag));
1284 OUTPUT:
1285 RETVAL
1286