1 /* This file is part of the autovivification Perl module.
2 * See http://search.cpan.org/dist/autovivification/ */
4 #define PERL_NO_GET_CONTEXT
9 /* --- XS helpers ---------------------------------------------------------- */
11 #define XSH_PACKAGE "autovivification"
18 /* ... Lexical hints ....................................................... */
20 /* Used both for hints and op flags */
21 #define A_HINT_STRICT 1
23 #define A_HINT_FETCH 4
24 #define A_HINT_STORE 8
25 #define A_HINT_EXISTS 16
26 #define A_HINT_DELETE 32
27 #define A_HINT_NOTIFY (A_HINT_STRICT|A_HINT_WARN)
28 #define A_HINT_DO (A_HINT_FETCH|A_HINT_STORE|A_HINT_EXISTS|A_HINT_DELETE)
29 #define A_HINT_MASK (A_HINT_NOTIFY|A_HINT_DO)
31 /* Only used in op flags */
32 #define A_HINT_ROOT 64
33 #define A_HINT_DEREF 128
35 #define XSH_HINTS_TYPE_UV 1
37 #include "xsh/hints.h"
39 #define a_hint() xsh_hints_detag(xsh_hints_fetch())
41 /* ... Thread-local storage ................................................ */
43 #define XSH_THREADS_COMPILE_TIME_PROTECTION 1
44 #define XSH_THREADS_USER_CONTEXT 0
46 #include "xsh/threads.h"
48 /* --- Compatibility wrappers ---------------------------------------------- */
51 # define HvNAME_get(H) HvNAME(H)
55 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
58 #ifndef A_HAS_MULTIDEREF
59 # define A_HAS_MULTIDEREF XSH_HAS_PERL(5, 21, 7)
62 /* ... Our vivify_ref() .................................................... */
64 /* Perl_vivify_ref() is not exported, so we have to reimplement it. */
68 static SV *a_vivify_ref(pTHX_ SV *sv, int to_hash) {
69 #define a_vivify_ref(S, TH) a_vivify_ref(aTHX_ (S), (TH))
76 Perl_croak_no_modify();
78 /* Inlined prepare_SV_for_RV() */
79 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) {
80 sv_upgrade(sv, SVt_IV);
81 } else if (SvTYPE(sv) >= SVt_PV) {
87 val = to_hash ? MUTABLE_SV(newHV()) : MUTABLE_SV(newAV());
95 SV *msv = sv_newmortal();
96 sv_setsv_nomg(msv, sv);
103 #endif /* A_HAS_MULTIDEREF */
105 /* --- op => info map ------------------------------------------------------ */
113 #define PTABLE_NAME ptable_map
114 #define PTABLE_VAL_FREE(V) PerlMemShared_free(V)
115 #define PTABLE_VAL_NEED_CONTEXT 0
116 #define PTABLE_NEED_DELETE 1
117 #define PTABLE_NEED_WALK 0
119 #include "xsh/ptable.h"
121 #define ptable_map_store(T, K, V) ptable_map_store(aPMS_ (T), (K), (V))
122 #define ptable_map_delete(T, K) ptable_map_delete(aPMS_ (T), (K))
123 #define ptable_map_free(T) ptable_map_free(aPMS_ (T))
125 static ptable *a_op_map = NULL;
129 #define dA_MAP_THX a_op_info a_op_map_tmp_oi
131 static perl_mutex a_op_map_mutex;
133 static const a_op_info *a_map_fetch(const OP *o, a_op_info *oi) {
134 const a_op_info *val;
136 XSH_LOCK(&a_op_map_mutex);
138 val = ptable_fetch(a_op_map, o);
144 XSH_UNLOCK(&a_op_map_mutex);
149 #define a_map_fetch(O) a_map_fetch((O), &a_op_map_tmp_oi)
151 #else /* USE_ITHREADS */
153 #define dA_MAP_THX dNOOP
155 #define a_map_fetch(O) ptable_fetch(a_op_map, (O))
157 #endif /* !USE_ITHREADS */
159 static const a_op_info *a_map_store_locked(pPMS_ const OP *o, OP *(*old_pp)(pTHX), void *next, UV flags) {
160 #define a_map_store_locked(O, PP, N, F) a_map_store_locked(aPMS_ (O), (PP), (N), (F))
163 if (!(oi = ptable_fetch(a_op_map, o))) {
164 oi = PerlMemShared_malloc(sizeof *oi);
165 ptable_map_store(a_op_map, o, oi);
175 static void a_map_store(pTHX_ const OP *o, OP *(*old_pp)(pTHX), void *next, UV flags) {
176 #define a_map_store(O, PP, N, F) a_map_store(aTHX_ (O), (PP), (N), (F))
177 XSH_LOCK(&a_op_map_mutex);
179 a_map_store_locked(o, old_pp, next, flags);
181 XSH_UNLOCK(&a_op_map_mutex);
184 static void a_map_delete(pTHX_ const OP *o) {
185 #define a_map_delete(O) a_map_delete(aTHX_ (O))
186 XSH_LOCK(&a_op_map_mutex);
188 ptable_map_delete(a_op_map, o);
190 XSH_UNLOCK(&a_op_map_mutex);
193 static const OP *a_map_descend(const OP *o) {
194 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
198 case OA_BASEOP_OR_UNOP:
199 return cUNOPo->op_first;
202 return cLISTOPo->op_last;
208 static void a_map_store_root(pTHX_ const OP *root, OP *(*old_pp)(pTHX), UV flags) {
209 #define a_map_store_root(R, PP, F) a_map_store_root(aTHX_ (R), (PP), (F))
210 const a_op_info *roi;
214 XSH_LOCK(&a_op_map_mutex);
216 roi = a_map_store_locked(o, old_pp, (OP *) root, flags | A_HINT_ROOT);
218 while (o->op_flags & OPf_KIDS) {
219 o = a_map_descend(o);
222 if ((oi = ptable_fetch(a_op_map, o))) {
223 oi->flags &= ~A_HINT_ROOT;
224 oi->next = (a_op_info *) roi;
229 XSH_UNLOCK(&a_op_map_mutex);
234 static void a_map_update_flags_topdown(const OP *root, UV flags) {
238 XSH_LOCK(&a_op_map_mutex);
240 flags &= ~A_HINT_ROOT;
243 if ((oi = ptable_fetch(a_op_map, o)))
244 oi->flags = (oi->flags & A_HINT_ROOT) | flags;
245 if (!(o->op_flags & OPf_KIDS))
247 o = a_map_descend(o);
250 XSH_UNLOCK(&a_op_map_mutex);
255 #define a_map_cancel(R) a_map_update_flags_topdown((R), 0)
257 static void a_map_update_flags_bottomup(const OP *o, UV flags, UV rflags) {
260 XSH_LOCK(&a_op_map_mutex);
262 flags &= ~A_HINT_ROOT;
263 rflags |= A_HINT_ROOT;
265 oi = ptable_fetch(a_op_map, o);
266 while (!(oi->flags & A_HINT_ROOT)) {
272 XSH_UNLOCK(&a_op_map_mutex);
277 /* ... Decide whether this expression should be autovivified or not ........ */
279 static UV a_map_resolve(const OP *o, const a_op_info *oi) {
280 UV flags = 0, rflags;
282 const a_op_info *roi = oi;
284 while (!(roi->flags & A_HINT_ROOT))
289 rflags = roi->flags & ~A_HINT_ROOT;
294 if (root->op_flags & OPf_MOD) {
295 if (rflags & A_HINT_STORE)
296 flags = (A_HINT_STORE|A_HINT_DEREF);
297 } else if (rflags & A_HINT_FETCH)
298 flags = (A_HINT_FETCH|A_HINT_DEREF);
302 a_map_update_flags_bottomup(o, 0, 0);
306 flags |= (rflags & A_HINT_NOTIFY);
307 a_map_update_flags_bottomup(o, flags, 0);
309 return oi->flags & A_HINT_ROOT ? 0 : flags;
312 /* ... Inspired from pp_defined() .......................................... */
314 static int a_undef(pTHX_ SV *sv) {
315 #define a_undef(S) a_undef(aTHX_ (S))
316 switch (SvTYPE(sv)) {
320 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv)
321 || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
325 if (HvARRAY(sv) || SvGMAGICAL(sv)
326 || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
338 /* --- PP functions -------------------------------------------------------- */
340 /* Be aware that we restore PL_op->op_ppaddr from the pointer table old_pp
341 * value, another extension might have saved our pp replacement as the ppaddr
342 * for this op, so this doesn't ensure that our function will never be called
343 * again. That's why we don't remove the op info from our map, so that it can
344 * still run correctly if required. */
346 /* ... pp_rv2av ............................................................ */
348 static OP *a_pp_rv2av(pTHX) {
353 oi = a_map_fetch(PL_op);
355 if (oi->flags & A_HINT_DEREF) {
357 /* We always need to push an empty array to fool the pp_aelem() that comes
361 av = sv_2mortal((SV *) newAV());
367 return oi->old_pp(aTHX);
370 /* ... pp_rv2hv ............................................................ */
372 static OP *a_pp_rv2hv_simple(pTHX) {
377 oi = a_map_fetch(PL_op);
379 if (oi->flags & A_HINT_DEREF) {
384 return oi->old_pp(aTHX);
387 static OP *a_pp_rv2hv(pTHX) {
392 oi = a_map_fetch(PL_op);
394 if (oi->flags & A_HINT_DEREF) {
398 hv = sv_2mortal((SV *) newHV());
404 return oi->old_pp(aTHX);
407 /* ... pp_deref (aelem,helem,rv2sv,padsv) .................................. */
409 static void a_cannot_vivify(pTHX_ UV flags) {
410 #define a_cannot_vivify(F) a_cannot_vivify(aTHX_ (F))
411 if (flags & A_HINT_STRICT)
412 croak("Reference vivification forbidden");
413 else if (flags & A_HINT_WARN)
414 warn("Reference was vivified");
415 else /* A_HINT_STORE */
416 croak("Can't vivify reference");
419 static OP *a_pp_deref(pTHX) {
425 oi = a_map_fetch(PL_op);
428 if (flags & A_HINT_DEREF) {
431 o = oi->old_pp(aTHX);
433 if (flags & (A_HINT_NOTIFY|A_HINT_STORE)) {
436 a_cannot_vivify(flags);
442 return oi->old_pp(aTHX);
445 /* ... pp_root (exists,delete,keys,values) ................................. */
447 static OP *a_pp_root_unop(pTHX) {
452 /* Can only be reached by keys or values */
453 if (GIMME_V == G_SCALAR) {
462 const a_op_info *oi = a_map_fetch(PL_op);
463 return oi->old_pp(aTHX);
467 static OP *a_pp_root_binop(pTHX) {
470 if (a_undef(TOPm1s)) {
473 if (PL_op->op_type == OP_EXISTS)
481 const a_op_info *oi = a_map_fetch(PL_op);
482 return oi->old_pp(aTHX);
488 /* ... pp_multideref ....................................................... */
490 /* This pp replacement is actually only called for topmost exists/delete ops,
491 * because we hijack the [ah]elem check functions and this disables the
492 * optimization for lvalue and rvalue dereferencing. In particular, the
493 * OPf_MOD branches should never be covered. In the future, the multideref
494 * optimization might also be disabled for custom exists/delete check functions,
495 * which will make this section unnecessary. However, the code tries to be as
496 * general as possible in case I think of a way to reenable the multideref
497 * optimization even when this module is in use. */
499 static UV a_do_multideref(const OP *o, UV flags) {
500 UV isexdel, other_flags;
502 XSH_ASSERT(o->op_type == OP_MULTIDEREF);
504 other_flags = flags & ~A_HINT_DO;
506 isexdel = o->op_private & (OPpMULTIDEREF_EXISTS|OPpMULTIDEREF_DELETE);
508 if (isexdel & OPpMULTIDEREF_EXISTS) {
509 flags &= A_HINT_EXISTS;
511 flags &= A_HINT_DELETE;
514 if (o->op_flags & OPf_MOD) {
515 flags &= A_HINT_STORE;
517 flags &= A_HINT_FETCH;
521 return flags ? (flags | other_flags) : 0;
524 static SV *a_do_fake_pp(pTHX_ OP *op) {
525 #define a_do_fake_pp(O) a_do_fake_pp(aTHX_ (O))
531 PL_op->op_ppaddr(aTHX);
545 static void a_do_fake_pp_unop_init(pTHX_ UNOP *unop, U32 type, U32 flags) {
546 #define a_do_fake_pp_unop_init(O, T, F) a_do_fake_pp_unop_init(aTHX_ (O), (T), (F))
547 unop->op_type = type;
548 unop->op_flags = OPf_WANT_SCALAR | (~OPf_WANT & flags);
549 unop->op_private = 0;
550 unop->op_first = NULL;
551 unop->op_ppaddr = PL_ppaddr[type];
554 static SV *a_do_fake_pp_unop_arg1(pTHX_ U32 type, U32 flags, SV *arg) {
555 #define a_do_fake_pp_unop_arg1(T, F, A) a_do_fake_pp_unop_arg1(aTHX_ (T), (F), (A))
559 a_do_fake_pp_unop_init(&unop, type, flags);
565 return a_do_fake_pp((OP *) &unop);
568 static SV *a_do_fake_pp_unop_arg2(pTHX_ U32 type, U32 flags, SV *arg1, SV *arg2) {
569 #define a_do_fake_pp_unop_arg2(T, F, A1, A2) a_do_fake_pp_unop_arg2(aTHX_ (T), (F), (A1), (A2))
573 a_do_fake_pp_unop_init(&unop, type, flags);
580 return a_do_fake_pp((OP *) &unop);
583 #define a_do_pp_rv2av(R) a_do_fake_pp_unop_arg1(OP_RV2AV, OPf_REF, (R))
584 #define a_do_pp_afetch(A, I) a_do_fake_pp_unop_arg2(OP_AELEM, 0, (A), (I))
585 #define a_do_pp_afetch_lv(A, I) a_do_fake_pp_unop_arg2(OP_AELEM, OPf_MOD, (A), (I))
586 #define a_do_pp_aexists(A, I) a_do_fake_pp_unop_arg2(OP_EXISTS, OPf_SPECIAL, (A), (I))
587 #define a_do_pp_adelete(A, I) a_do_fake_pp_unop_arg2(OP_DELETE, OPf_SPECIAL, (A), (I))
589 #define a_do_pp_rv2hv(R) a_do_fake_pp_unop_arg1(OP_RV2HV, OPf_REF, (R))
590 #define a_do_pp_hfetch(H, K) a_do_fake_pp_unop_arg2(OP_HELEM, 0, (H), (K))
591 #define a_do_pp_hfetch_lv(H, K) a_do_fake_pp_unop_arg2(OP_HELEM, OPf_MOD, (H), (K))
592 #define a_do_pp_hexists(H, K) a_do_fake_pp_unop_arg2(OP_EXISTS, 0, (H), (K))
593 #define a_do_pp_hdelete(H, K) a_do_fake_pp_unop_arg2(OP_DELETE, 0, (H), (K))
595 static OP *a_pp_multideref(pTHX) {
596 UNOP_AUX_item *items;
604 const a_op_info *oi = a_map_fetch(PL_op);
606 flags = a_do_multideref(PL_op, oi->flags);
608 return oi->old_pp(aTHX);
611 items = cUNOP_AUXx(PL_op)->op_aux;
614 PL_multideref_pc = items;
617 switch (actions & MDEREF_ACTION_MASK) {
619 actions = (++items)->uv;
621 case MDEREF_AV_padav_aelem: /* $lex[...] */
622 sv = PAD_SVl((++items)->pad_offset);
626 case MDEREF_AV_gvav_aelem: /* $pkg[...] */
627 sv = UNOP_AUX_item_sv(++items);
628 XSH_ASSERT(isGV_with_GP(sv));
629 sv = (SV *) GvAVn((GV *) sv);
633 case MDEREF_AV_pop_rv2av_aelem: /* expr->[...] */
637 goto do_AV_rv2av_aelem;
638 case MDEREF_AV_gvsv_vivify_rv2av_aelem: /* $pkg->[...] */
639 sv = UNOP_AUX_item_sv(++items);
640 XSH_ASSERT(isGV_with_GP(sv));
641 sv = GvSVn((GV *) sv);
644 goto do_AV_vivify_rv2av_aelem;
645 case MDEREF_AV_padsv_vivify_rv2av_aelem: /* $lex->[...] */
646 sv = PAD_SVl((++items)->pad_offset);
648 case MDEREF_AV_vivify_rv2av_aelem: /* vivify, ->[...] */
651 do_AV_vivify_rv2av_aelem:
652 sv = a_vivify_ref(sv, 0);
654 sv = a_do_pp_rv2av(sv);
658 XSH_ASSERT(SvTYPE(sv) == SVt_PVAV);
659 switch (actions & MDEREF_INDEX_MASK) {
660 case MDEREF_INDEX_none:
662 case MDEREF_INDEX_const:
663 esv = sv_2mortal(newSViv((++items)->iv));
665 case MDEREF_INDEX_padsv:
666 esv = PAD_SVl((++items)->pad_offset);
668 case MDEREF_INDEX_gvsv:
669 esv = UNOP_AUX_item_sv(++items);
670 XSH_ASSERT(isGV_with_GP(esv));
671 esv = GvSVn((GV *) esv);
673 if (UNLIKELY(SvROK(esv) && !SvGAMAGIC(esv) && ckWARN(WARN_MISC)))
674 Perl_warner(aTHX_ packWARN(WARN_MISC),
675 "Use of reference \"%"SVf"\" as array index",
679 PL_multideref_pc = items;
680 if (actions & MDEREF_FLAG_last) {
681 switch (flags & A_HINT_DO) {
683 sv = a_do_pp_afetch(sv, esv);
686 sv = a_do_pp_afetch_lv(sv, esv);
689 sv = a_do_pp_aexists(sv, esv);
692 sv = a_do_pp_adelete(sv, esv);
697 sv = a_do_pp_afetch(sv, esv);
700 case MDEREF_HV_padhv_helem: /* $lex{...} */
701 sv = PAD_SVl((++items)->pad_offset);
705 case MDEREF_HV_gvhv_helem: /* $pkg{...} */
706 sv = UNOP_AUX_item_sv(++items);
707 XSH_ASSERT(isGV_with_GP(sv));
708 sv = (SV *) GvHVn((GV *) sv);
712 case MDEREF_HV_pop_rv2hv_helem: /* expr->{...} */
716 goto do_HV_rv2hv_helem;
717 case MDEREF_HV_gvsv_vivify_rv2hv_helem: /* $pkg->{...} */
718 sv = UNOP_AUX_item_sv(++items);
719 XSH_ASSERT(isGV_with_GP(sv));
720 sv = GvSVn((GV *) sv);
723 goto do_HV_vivify_rv2hv_helem;
724 case MDEREF_HV_padsv_vivify_rv2hv_helem: /* $lex->{...} */
725 sv = PAD_SVl((++items)->pad_offset);
727 case MDEREF_HV_vivify_rv2hv_helem: /* vivify, ->{...} */
730 do_HV_vivify_rv2hv_helem:
731 sv = a_vivify_ref(sv, 1);
733 sv = a_do_pp_rv2hv(sv);
737 XSH_ASSERT(SvTYPE(sv) == SVt_PVHV);
738 switch (actions & MDEREF_INDEX_MASK) {
739 case MDEREF_INDEX_none:
741 case MDEREF_INDEX_const:
742 key = UNOP_AUX_item_sv(++items);
744 case MDEREF_INDEX_padsv:
745 key = PAD_SVl((++items)->pad_offset);
747 case MDEREF_INDEX_gvsv:
748 key = UNOP_AUX_item_sv(++items);
749 XSH_ASSERT(isGV_with_GP(key));
750 key = GvSVn((GV *) key);
753 PL_multideref_pc = items;
754 if (actions & MDEREF_FLAG_last) {
755 switch (flags & A_HINT_DO) {
757 sv = a_do_pp_hfetch(sv, key);
760 sv = a_do_pp_hfetch_lv(sv, key);
763 sv = a_do_pp_hexists(sv, key);
766 sv = a_do_pp_hdelete(sv, key);
773 sv = a_do_pp_hfetch(sv, key);
778 actions >>= MDEREF_SHIFT;
782 if (flags & (A_HINT_NOTIFY|A_HINT_STORE))
783 a_cannot_vivify(flags);
784 if (flags & A_HINT_EXISTS)
793 #endif /* A_HAS_MULTIDEREF */
795 /* --- Check functions ----------------------------------------------------- */
797 static void a_recheck_rv2xv(pTHX_ OP *o, OPCODE type, OP *(*new_pp)(pTHX)) {
798 #define a_recheck_rv2xv(O, T, PP) a_recheck_rv2xv(aTHX_ (O), (T), (PP))
800 if (o->op_type == type && o->op_ppaddr != new_pp
801 && cUNOPo->op_first->op_type != OP_GV) {
803 const a_op_info *oi = a_map_fetch(o);
805 a_map_store(o, o->op_ppaddr, oi->next, oi->flags);
806 o->op_ppaddr = new_pp;
813 /* ... ck_pad{any,sv} ...................................................... */
815 /* Sadly, the padsv OPs we are interested in don't trigger the padsv check
816 * function, but are instead manually mutated from a padany. So we store
817 * the op entry in the op map in the padany check function, and we set their
818 * op_ppaddr member in our peephole optimizer replacement below. */
820 static OP *(*a_old_ck_padany)(pTHX_ OP *) = 0;
822 static OP *a_ck_padany(pTHX_ OP *o) {
825 o = a_old_ck_padany(aTHX_ o);
828 if (hint & A_HINT_DO)
829 a_map_store_root(o, o->op_ppaddr, hint);
836 static OP *(*a_old_ck_padsv)(pTHX_ OP *) = 0;
838 static OP *a_ck_padsv(pTHX_ OP *o) {
841 o = a_old_ck_padsv(aTHX_ o);
844 if (hint & A_HINT_DO) {
845 a_map_store_root(o, o->op_ppaddr, hint);
846 o->op_ppaddr = a_pp_deref;
853 /* ... ck_deref (aelem,helem,rv2sv) ........................................ */
855 /* Those ops appear both at the root and inside an expression but there's no
856 * way to distinguish both situations. Worse, we can't even know if we are in a
857 * modifying context, so the expression can't be resolved yet. It will be at the
858 * first invocation of a_pp_deref() for this expression. */
860 static OP *(*a_old_ck_aelem)(pTHX_ OP *) = 0;
861 static OP *(*a_old_ck_helem)(pTHX_ OP *) = 0;
862 static OP *(*a_old_ck_rv2sv)(pTHX_ OP *) = 0;
864 static OP *a_ck_deref(pTHX_ OP *o) {
865 OP * (*old_ck)(pTHX_ OP *o) = 0;
868 switch (o->op_type) {
870 old_ck = a_old_ck_aelem;
871 if ((hint & A_HINT_DO) && !(hint & A_HINT_STRICT))
872 a_recheck_rv2xv(cUNOPo->op_first, OP_RV2AV, a_pp_rv2av);
875 old_ck = a_old_ck_helem;
876 if ((hint & A_HINT_DO) && !(hint & A_HINT_STRICT))
877 a_recheck_rv2xv(cUNOPo->op_first, OP_RV2HV, a_pp_rv2hv_simple);
880 old_ck = a_old_ck_rv2sv;
886 if (old_ck == a_old_ck_rv2sv && o->op_flags & OPf_KIDS) {
887 OP *kid = cUNOPo->op_first;
888 if (kid && kid->op_type == OP_GV) {
889 if (hint & A_HINT_DO)
890 a_map_store(kid, kid->op_ppaddr, NULL, hint);
897 if (hint & A_HINT_DO) {
898 a_map_store_root(o, o->op_ppaddr, hint);
899 o->op_ppaddr = a_pp_deref;
906 /* ... ck_rv2xv (rv2av,rv2hv) .............................................. */
908 /* Those ops also appear both inisde and at the root, hence the caveats for
909 * a_ck_deref() still apply here. Since a padsv/rv2sv must appear before a
910 * rv2[ah]v, resolution is handled by the first call to a_pp_deref() in the
913 static OP *(*a_old_ck_rv2av)(pTHX_ OP *) = 0;
914 static OP *(*a_old_ck_rv2hv)(pTHX_ OP *) = 0;
916 static OP *a_ck_rv2xv(pTHX_ OP *o) {
917 OP * (*old_ck)(pTHX_ OP *o) = 0;
918 OP * (*new_pp)(pTHX) = 0;
921 switch (o->op_type) {
922 case OP_RV2AV: old_ck = a_old_ck_rv2av; new_pp = a_pp_rv2av; break;
923 case OP_RV2HV: old_ck = a_old_ck_rv2hv; new_pp = a_pp_rv2hv_simple; break;
927 if (cUNOPo->op_first->op_type == OP_GV)
931 if (hint & A_HINT_DO && !(hint & A_HINT_STRICT)) {
932 a_map_store_root(o, o->op_ppaddr, hint);
933 o->op_ppaddr = new_pp;
940 /* ... ck_xslice (aslice,hslice) ........................................... */
942 /* I think those are only found at the root, but there's nothing that really
943 * prevent them to be inside the expression too. We only need to update the
944 * root so that the rest of the expression will see the right context when
945 * resolving. That's why we don't replace the ppaddr. */
947 static OP *(*a_old_ck_aslice)(pTHX_ OP *) = 0;
948 static OP *(*a_old_ck_hslice)(pTHX_ OP *) = 0;
950 static OP *a_ck_xslice(pTHX_ OP *o) {
951 OP * (*old_ck)(pTHX_ OP *o) = 0;
954 switch (o->op_type) {
956 old_ck = a_old_ck_aslice;
959 old_ck = a_old_ck_hslice;
960 if (hint & A_HINT_DO)
961 a_recheck_rv2xv(OpSIBLING(cUNOPo->op_first), OP_RV2HV, a_pp_rv2hv);
966 if (hint & A_HINT_DO) {
967 a_map_store_root(o, 0, hint);
974 /* ... ck_root (exists,delete,keys,values) ................................. */
976 /* Those ops are only found at the root of a dereferencing expression. We can
977 * then resolve at compile time if vivification must take place or not. */
979 static OP *(*a_old_ck_exists)(pTHX_ OP *) = 0;
980 static OP *(*a_old_ck_delete)(pTHX_ OP *) = 0;
981 static OP *(*a_old_ck_keys) (pTHX_ OP *) = 0;
982 static OP *(*a_old_ck_values)(pTHX_ OP *) = 0;
984 static OP *a_ck_root(pTHX_ OP *o) {
985 OP * (*old_ck)(pTHX_ OP *o) = 0;
986 OP * (*new_pp)(pTHX) = 0;
987 bool enabled = FALSE;
990 switch (o->op_type) {
992 old_ck = a_old_ck_exists;
993 new_pp = a_pp_root_binop;
994 enabled = hint & A_HINT_EXISTS;
997 old_ck = a_old_ck_delete;
998 new_pp = a_pp_root_binop;
999 enabled = hint & A_HINT_DELETE;
1002 old_ck = a_old_ck_keys;
1003 new_pp = a_pp_root_unop;
1004 enabled = hint & A_HINT_FETCH;
1007 old_ck = a_old_ck_values;
1008 new_pp = a_pp_root_unop;
1009 enabled = hint & A_HINT_FETCH;
1012 o = old_ck(aTHX_ o);
1014 if (hint & A_HINT_DO) {
1016 a_map_update_flags_topdown(o, hint | A_HINT_DEREF);
1017 a_map_store_root(o, o->op_ppaddr, hint);
1018 o->op_ppaddr = new_pp;
1028 /* --- Our peephole optimizer ---------------------------------------------- */
1030 static void xsh_peep_rec(pTHX_ OP *o, ptable *seen) {
1031 for (; o; o = o->op_next) {
1033 const a_op_info *oi = NULL;
1036 if (xsh_peep_seen(o, seen))
1039 switch (o->op_type) {
1041 if (o->op_ppaddr != a_pp_deref) {
1042 oi = a_map_fetch(o);
1043 if (oi && (oi->flags & A_HINT_DO)) {
1044 a_map_store(o, o->op_ppaddr, oi->next, oi->flags);
1045 o->op_ppaddr = a_pp_deref;
1053 if (o->op_ppaddr != a_pp_deref)
1055 oi = a_map_fetch(o);
1059 if (!(flags & A_HINT_DEREF)
1060 && (flags & A_HINT_DO)
1061 && (o->op_private & OPpDEREF || flags & A_HINT_ROOT)) {
1062 /* Decide if the expression must autovivify or not. */
1063 flags = a_map_resolve(o, oi);
1065 if (flags & A_HINT_DEREF)
1066 o->op_private = ((o->op_private & ~OPpDEREF) | OPpLVAL_DEFER);
1068 o->op_ppaddr = oi->old_pp;
1072 if ( o->op_ppaddr != a_pp_rv2av
1073 && o->op_ppaddr != a_pp_rv2hv
1074 && o->op_ppaddr != a_pp_rv2hv_simple)
1076 oi = a_map_fetch(o);
1079 if (!(oi->flags & A_HINT_DEREF))
1080 o->op_ppaddr = oi->old_pp;
1082 #if A_HAS_MULTIDEREF
1084 if (o->op_ppaddr != a_pp_multideref) {
1085 oi = a_map_fetch(cUNOPo->op_first);
1089 if (a_do_multideref(o, flags)) {
1090 a_map_store_root(o, o->op_ppaddr, flags & ~A_HINT_DEREF);
1091 o->op_ppaddr = a_pp_multideref;
1097 xsh_peep_maybe_recurse(o, seen);
1103 /* --- Module setup/teardown ----------------------------------------------- */
1105 static void xsh_user_global_setup(pTHX) {
1106 a_op_map = ptable_new(32);
1109 MUTEX_INIT(&a_op_map_mutex);
1112 xsh_ck_replace(OP_PADANY, a_ck_padany, &a_old_ck_padany);
1113 xsh_ck_replace(OP_PADSV, a_ck_padsv, &a_old_ck_padsv);
1115 xsh_ck_replace(OP_AELEM, a_ck_deref, &a_old_ck_aelem);
1116 xsh_ck_replace(OP_HELEM, a_ck_deref, &a_old_ck_helem);
1117 xsh_ck_replace(OP_RV2SV, a_ck_deref, &a_old_ck_rv2sv);
1119 xsh_ck_replace(OP_RV2AV, a_ck_rv2xv, &a_old_ck_rv2av);
1120 xsh_ck_replace(OP_RV2HV, a_ck_rv2xv, &a_old_ck_rv2hv);
1122 xsh_ck_replace(OP_ASLICE, a_ck_xslice, &a_old_ck_aslice);
1123 xsh_ck_replace(OP_HSLICE, a_ck_xslice, &a_old_ck_hslice);
1125 xsh_ck_replace(OP_EXISTS, a_ck_root, &a_old_ck_exists);
1126 xsh_ck_replace(OP_DELETE, a_ck_root, &a_old_ck_delete);
1127 xsh_ck_replace(OP_KEYS, a_ck_root, &a_old_ck_keys);
1128 xsh_ck_replace(OP_VALUES, a_ck_root, &a_old_ck_values);
1133 static void xsh_user_local_setup(pTHX) {
1136 stash = gv_stashpvn(XSH_PACKAGE, XSH_PACKAGE_LEN, 1);
1137 newCONSTSUB(stash, "A_HINT_STRICT", newSVuv(A_HINT_STRICT));
1138 newCONSTSUB(stash, "A_HINT_WARN", newSVuv(A_HINT_WARN));
1139 newCONSTSUB(stash, "A_HINT_FETCH", newSVuv(A_HINT_FETCH));
1140 newCONSTSUB(stash, "A_HINT_STORE", newSVuv(A_HINT_STORE));
1141 newCONSTSUB(stash, "A_HINT_EXISTS", newSVuv(A_HINT_EXISTS));
1142 newCONSTSUB(stash, "A_HINT_DELETE", newSVuv(A_HINT_DELETE));
1143 newCONSTSUB(stash, "A_HINT_MASK", newSVuv(A_HINT_MASK));
1144 newCONSTSUB(stash, "A_THREADSAFE", newSVuv(XSH_THREADSAFE));
1145 newCONSTSUB(stash, "A_FORKSAFE", newSVuv(XSH_FORKSAFE));
1150 static void xsh_user_local_teardown(pTHX) {
1154 static void xsh_user_global_teardown(pTHX) {
1155 xsh_ck_restore(OP_PADANY, &a_old_ck_padany);
1156 xsh_ck_restore(OP_PADSV, &a_old_ck_padsv);
1158 xsh_ck_restore(OP_AELEM, &a_old_ck_aelem);
1159 xsh_ck_restore(OP_HELEM, &a_old_ck_helem);
1160 xsh_ck_restore(OP_RV2SV, &a_old_ck_rv2sv);
1162 xsh_ck_restore(OP_RV2AV, &a_old_ck_rv2av);
1163 xsh_ck_restore(OP_RV2HV, &a_old_ck_rv2hv);
1165 xsh_ck_restore(OP_ASLICE, &a_old_ck_aslice);
1166 xsh_ck_restore(OP_HSLICE, &a_old_ck_hslice);
1168 xsh_ck_restore(OP_EXISTS, &a_old_ck_exists);
1169 xsh_ck_restore(OP_DELETE, &a_old_ck_delete);
1170 xsh_ck_restore(OP_KEYS, &a_old_ck_keys);
1171 xsh_ck_restore(OP_VALUES, &a_old_ck_values);
1173 ptable_map_free(a_op_map);
1177 MUTEX_DESTROY(&a_op_map_mutex);
1183 /* --- XS ------------------------------------------------------------------ */
1185 MODULE = autovivification PACKAGE = autovivification
1203 #endif /* XSH_THREADSAFE */
1209 RETVAL = xsh_hints_tag(SvOK(hint) ? SvUV(hint) : 0);
1219 RETVAL = newSVuv(xsh_hints_detag(tag));