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_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)
33 /* Only used in op flags */
34 #define A_HINT_ROOT 256
35 #define A_HINT_DEREF 512
37 #define XSH_HINTS_TYPE_UV 1
39 #include "xsh/hints.h"
41 #define a_hint() xsh_hints_detag(xsh_hints_fetch())
43 /* ... Thread-local storage ................................................ */
45 #define XSH_THREADS_COMPILE_TIME_PROTECTION 1
46 #define XSH_THREADS_USER_CONTEXT 0
48 #include "xsh/threads.h"
50 /* --- Compatibility wrappers ---------------------------------------------- */
53 # define HvNAME_get(H) HvNAME(H)
57 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
60 #ifndef A_HAS_MULTIDEREF
61 # define A_HAS_MULTIDEREF XSH_HAS_PERL(5, 21, 7)
64 /* ... Our vivify_ref() .................................................... */
66 /* Perl_vivify_ref() is not exported, so we have to reimplement it. */
70 static SV *a_vivify_ref(pTHX_ SV *sv, int to_hash) {
71 #define a_vivify_ref(S, TH) a_vivify_ref(aTHX_ (S), (TH))
78 Perl_croak_no_modify();
80 /* Inlined prepare_SV_for_RV() */
81 if (SvTYPE(sv) < SVt_PV && SvTYPE(sv) != SVt_IV) {
82 sv_upgrade(sv, SVt_IV);
83 } else if (SvTYPE(sv) >= SVt_PV) {
89 val = to_hash ? MUTABLE_SV(newHV()) : MUTABLE_SV(newAV());
97 SV *msv = sv_newmortal();
98 sv_setsv_nomg(msv, sv);
105 #endif /* A_HAS_MULTIDEREF */
107 /* --- op => info map ------------------------------------------------------ */
115 #define PTABLE_NAME ptable_map
116 #define PTABLE_VAL_FREE(V) PerlMemShared_free(V)
117 #define PTABLE_VAL_NEED_CONTEXT 0
118 #define PTABLE_NEED_DELETE 1
119 #define PTABLE_NEED_WALK 0
121 #include "xsh/ptable.h"
123 #define ptable_map_store(T, K, V) ptable_map_store(aPMS_ (T), (K), (V))
124 #define ptable_map_delete(T, K) ptable_map_delete(aPMS_ (T), (K))
125 #define ptable_map_free(T) ptable_map_free(aPMS_ (T))
127 static ptable *a_op_map = NULL;
131 #define dA_MAP_THX a_op_info a_op_map_tmp_oi
133 static perl_mutex a_op_map_mutex;
135 static const a_op_info *a_map_fetch(const OP *o, a_op_info *oi) {
136 const a_op_info *val;
138 XSH_LOCK(&a_op_map_mutex);
140 val = ptable_fetch(a_op_map, o);
146 XSH_UNLOCK(&a_op_map_mutex);
151 #define a_map_fetch(O) a_map_fetch((O), &a_op_map_tmp_oi)
153 #else /* USE_ITHREADS */
155 #define dA_MAP_THX dNOOP
157 #define a_map_fetch(O) ptable_fetch(a_op_map, (O))
159 #endif /* !USE_ITHREADS */
161 static const a_op_info *a_map_store_locked(pPMS_ const OP *o, OP *(*old_pp)(pTHX), void *next, UV flags) {
162 #define a_map_store_locked(O, PP, N, F) a_map_store_locked(aPMS_ (O), (PP), (N), (F))
165 if (!(oi = ptable_fetch(a_op_map, o))) {
166 oi = PerlMemShared_malloc(sizeof *oi);
167 ptable_map_store(a_op_map, o, oi);
177 static void a_map_store(pTHX_ const OP *o, OP *(*old_pp)(pTHX), void *next, UV flags) {
178 #define a_map_store(O, PP, N, F) a_map_store(aTHX_ (O), (PP), (N), (F))
179 XSH_LOCK(&a_op_map_mutex);
181 a_map_store_locked(o, old_pp, next, flags);
183 XSH_UNLOCK(&a_op_map_mutex);
186 static void a_map_delete(pTHX_ const OP *o) {
187 #define a_map_delete(O) a_map_delete(aTHX_ (O))
188 XSH_LOCK(&a_op_map_mutex);
190 ptable_map_delete(a_op_map, o);
192 XSH_UNLOCK(&a_op_map_mutex);
195 static const OP *a_map_descend(const OP *o) {
196 switch (PL_opargs[o->op_type] & OA_CLASS_MASK) {
200 case OA_BASEOP_OR_UNOP:
201 return cUNOPo->op_first;
204 return cLISTOPo->op_last;
210 static void a_map_store_root(pTHX_ const OP *root, OP *(*old_pp)(pTHX), UV flags) {
211 #define a_map_store_root(R, PP, F) a_map_store_root(aTHX_ (R), (PP), (F))
212 const a_op_info *roi;
216 XSH_LOCK(&a_op_map_mutex);
218 roi = a_map_store_locked(o, old_pp, (OP *) root, flags | A_HINT_ROOT);
220 while (o->op_flags & OPf_KIDS) {
221 o = a_map_descend(o);
224 if ((oi = ptable_fetch(a_op_map, o))) {
225 oi->flags &= ~A_HINT_ROOT;
226 oi->next = (a_op_info *) roi;
231 XSH_UNLOCK(&a_op_map_mutex);
236 static void a_map_update_flags_topdown(const OP *root, UV flags) {
240 XSH_LOCK(&a_op_map_mutex);
242 flags &= ~A_HINT_ROOT;
245 if ((oi = ptable_fetch(a_op_map, o)))
246 oi->flags = (oi->flags & A_HINT_ROOT) | flags;
247 if (!(o->op_flags & OPf_KIDS))
249 o = a_map_descend(o);
252 XSH_UNLOCK(&a_op_map_mutex);
257 #define a_map_cancel(R) a_map_update_flags_topdown((R), 0)
259 static void a_map_update_flags_bottomup(const OP *o, UV flags, UV rflags) {
262 XSH_LOCK(&a_op_map_mutex);
264 flags &= ~A_HINT_ROOT;
265 rflags |= A_HINT_ROOT;
267 oi = ptable_fetch(a_op_map, o);
268 while (!(oi->flags & A_HINT_ROOT)) {
274 XSH_UNLOCK(&a_op_map_mutex);
279 /* ... Decide whether this expression should be autovivified or not ........ */
281 static UV a_map_resolve(const OP *o, const a_op_info *oi) {
282 UV flags = 0, rflags;
284 const a_op_info *roi = oi;
286 while (!(roi->flags & A_HINT_ROOT))
291 rflags = roi->flags & ~A_HINT_ROOT;
296 if (root->op_flags & OPf_MOD) {
297 if (rflags & A_HINT_STORE)
298 flags = (A_HINT_STORE|A_HINT_DEREF);
300 if (rflags & (A_HINT_FETCH|A_HINT_KEYS|A_HINT_VALUES))
301 flags = (rflags|A_HINT_DEREF);
306 a_map_update_flags_bottomup(o, 0, 0);
310 flags |= (rflags & A_HINT_NOTIFY);
311 a_map_update_flags_bottomup(o, flags, 0);
313 return oi->flags & A_HINT_ROOT ? 0 : flags;
316 /* ... Inspired from pp_defined() .......................................... */
318 static int a_undef(pTHX_ SV *sv) {
319 #define a_undef(S) a_undef(aTHX_ (S))
320 switch (SvTYPE(sv)) {
324 if (AvMAX(sv) >= 0 || SvGMAGICAL(sv)
325 || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
329 if (HvARRAY(sv) || SvGMAGICAL(sv)
330 || (SvRMAGICAL(sv) && mg_find(sv, PERL_MAGIC_tied)))
342 /* --- PP functions -------------------------------------------------------- */
344 /* Be aware that we restore PL_op->op_ppaddr from the pointer table old_pp
345 * value, another extension might have saved our pp replacement as the ppaddr
346 * for this op, so this doesn't ensure that our function will never be called
347 * again. That's why we don't remove the op info from our map, so that it can
348 * still run correctly if required. */
350 /* ... pp_rv2av ............................................................ */
352 static OP *a_pp_rv2av(pTHX) {
357 oi = a_map_fetch(PL_op);
359 if (oi->flags & A_HINT_DEREF) {
361 /* We always need to push an empty array to fool the pp_aelem() that comes
365 av = sv_2mortal((SV *) newAV());
371 return oi->old_pp(aTHX);
374 /* ... pp_rv2hv ............................................................ */
376 static OP *a_pp_rv2hv_simple(pTHX) {
381 oi = a_map_fetch(PL_op);
383 if (oi->flags & A_HINT_DEREF) {
388 return oi->old_pp(aTHX);
391 static OP *a_pp_rv2hv(pTHX) {
396 oi = a_map_fetch(PL_op);
398 if (oi->flags & A_HINT_DEREF) {
402 hv = sv_2mortal((SV *) newHV());
408 return oi->old_pp(aTHX);
411 /* ... pp_deref (aelem,helem,rv2sv,padsv) .................................. */
413 static void a_cannot_vivify(pTHX_ UV flags) {
414 #define a_cannot_vivify(F) a_cannot_vivify(aTHX_ (F))
415 if (flags & A_HINT_STRICT)
416 croak("Reference vivification forbidden");
417 else if (flags & A_HINT_WARN)
418 warn("Reference was vivified");
419 else /* A_HINT_STORE */
420 croak("Can't vivify reference");
423 static OP *a_pp_deref(pTHX) {
429 oi = a_map_fetch(PL_op);
432 if (flags & A_HINT_DEREF) {
435 o = oi->old_pp(aTHX);
437 if (flags & (A_HINT_NOTIFY|A_HINT_STORE)) {
440 a_cannot_vivify(flags);
446 return oi->old_pp(aTHX);
449 /* ... pp_root (exists,delete,keys,values) ................................. */
451 static OP *a_pp_root_unop(pTHX) {
456 /* Can only be reached by keys or values */
457 if (GIMME_V == G_SCALAR) {
466 const a_op_info *oi = a_map_fetch(PL_op);
467 return oi->old_pp(aTHX);
471 static OP *a_pp_root_binop(pTHX) {
474 if (a_undef(TOPm1s)) {
477 if (PL_op->op_type == OP_EXISTS)
485 const a_op_info *oi = a_map_fetch(PL_op);
486 return oi->old_pp(aTHX);
492 /* ... pp_multideref ....................................................... */
494 /* This pp replacement is actually only called for topmost exists/delete ops,
495 * because we hijack the [ah]elem check functions and this disables the
496 * optimization for lvalue and rvalue dereferencing. In particular, the
497 * OPf_MOD branches should never be covered. In the future, the multideref
498 * optimization might also be disabled for custom exists/delete check functions,
499 * which will make this section unnecessary. However, the code tries to be as
500 * general as possible in case I think of a way to reenable the multideref
501 * optimization even when this module is in use. */
503 static UV a_do_multideref(const OP *o, UV flags) {
504 UV isexdel, other_flags;
506 XSH_ASSERT(o->op_type == OP_MULTIDEREF);
508 other_flags = flags & ~A_HINT_DO;
510 isexdel = o->op_private & (OPpMULTIDEREF_EXISTS|OPpMULTIDEREF_DELETE);
512 if (isexdel & OPpMULTIDEREF_EXISTS) {
513 flags &= A_HINT_EXISTS;
515 flags &= A_HINT_DELETE;
518 if (o->op_flags & OPf_MOD) {
519 flags &= A_HINT_STORE;
521 flags &= A_HINT_FETCH;
525 return flags ? (flags | other_flags) : 0;
528 static SV *a_do_fake_pp(pTHX_ OP *op) {
529 #define a_do_fake_pp(O) a_do_fake_pp(aTHX_ (O))
535 PL_op->op_ppaddr(aTHX);
549 static void a_do_fake_pp_unop_init(pTHX_ UNOP *unop, U32 type, U32 flags) {
550 #define a_do_fake_pp_unop_init(O, T, F) a_do_fake_pp_unop_init(aTHX_ (O), (T), (F))
551 unop->op_type = type;
552 unop->op_flags = OPf_WANT_SCALAR | (~OPf_WANT & flags);
553 unop->op_private = 0;
554 unop->op_first = NULL;
555 unop->op_ppaddr = PL_ppaddr[type];
558 static SV *a_do_fake_pp_unop_arg1(pTHX_ U32 type, U32 flags, SV *arg) {
559 #define a_do_fake_pp_unop_arg1(T, F, A) a_do_fake_pp_unop_arg1(aTHX_ (T), (F), (A))
563 a_do_fake_pp_unop_init(&unop, type, flags);
569 return a_do_fake_pp((OP *) &unop);
572 static SV *a_do_fake_pp_unop_arg2(pTHX_ U32 type, U32 flags, SV *arg1, SV *arg2) {
573 #define a_do_fake_pp_unop_arg2(T, F, A1, A2) a_do_fake_pp_unop_arg2(aTHX_ (T), (F), (A1), (A2))
577 a_do_fake_pp_unop_init(&unop, type, flags);
584 return a_do_fake_pp((OP *) &unop);
587 #define a_do_pp_rv2av(R) a_do_fake_pp_unop_arg1(OP_RV2AV, OPf_REF, (R))
588 #define a_do_pp_afetch(A, I) a_do_fake_pp_unop_arg2(OP_AELEM, 0, (A), (I))
589 #define a_do_pp_afetch_lv(A, I) a_do_fake_pp_unop_arg2(OP_AELEM, OPf_MOD, (A), (I))
590 #define a_do_pp_aexists(A, I) a_do_fake_pp_unop_arg2(OP_EXISTS, OPf_SPECIAL, (A), (I))
591 #define a_do_pp_adelete(A, I) a_do_fake_pp_unop_arg2(OP_DELETE, OPf_SPECIAL, (A), (I))
593 #define a_do_pp_rv2hv(R) a_do_fake_pp_unop_arg1(OP_RV2HV, OPf_REF, (R))
594 #define a_do_pp_hfetch(H, K) a_do_fake_pp_unop_arg2(OP_HELEM, 0, (H), (K))
595 #define a_do_pp_hfetch_lv(H, K) a_do_fake_pp_unop_arg2(OP_HELEM, OPf_MOD, (H), (K))
596 #define a_do_pp_hexists(H, K) a_do_fake_pp_unop_arg2(OP_EXISTS, 0, (H), (K))
597 #define a_do_pp_hdelete(H, K) a_do_fake_pp_unop_arg2(OP_DELETE, 0, (H), (K))
599 static OP *a_pp_multideref(pTHX) {
600 UNOP_AUX_item *items;
608 const a_op_info *oi = a_map_fetch(PL_op);
610 flags = a_do_multideref(PL_op, oi->flags);
612 return oi->old_pp(aTHX);
615 items = cUNOP_AUXx(PL_op)->op_aux;
618 PL_multideref_pc = items;
621 switch (actions & MDEREF_ACTION_MASK) {
623 actions = (++items)->uv;
625 case MDEREF_AV_padav_aelem: /* $lex[...] */
626 sv = PAD_SVl((++items)->pad_offset);
630 case MDEREF_AV_gvav_aelem: /* $pkg[...] */
631 sv = UNOP_AUX_item_sv(++items);
632 XSH_ASSERT(isGV_with_GP(sv));
633 sv = (SV *) GvAVn((GV *) sv);
637 case MDEREF_AV_pop_rv2av_aelem: /* expr->[...] */
641 goto do_AV_rv2av_aelem;
642 case MDEREF_AV_gvsv_vivify_rv2av_aelem: /* $pkg->[...] */
643 sv = UNOP_AUX_item_sv(++items);
644 XSH_ASSERT(isGV_with_GP(sv));
645 sv = GvSVn((GV *) sv);
648 goto do_AV_vivify_rv2av_aelem;
649 case MDEREF_AV_padsv_vivify_rv2av_aelem: /* $lex->[...] */
650 sv = PAD_SVl((++items)->pad_offset);
652 case MDEREF_AV_vivify_rv2av_aelem: /* vivify, ->[...] */
655 do_AV_vivify_rv2av_aelem:
656 sv = a_vivify_ref(sv, 0);
658 sv = a_do_pp_rv2av(sv);
662 XSH_ASSERT(SvTYPE(sv) == SVt_PVAV);
663 switch (actions & MDEREF_INDEX_MASK) {
664 case MDEREF_INDEX_none:
666 case MDEREF_INDEX_const:
667 esv = sv_2mortal(newSViv((++items)->iv));
669 case MDEREF_INDEX_padsv:
670 esv = PAD_SVl((++items)->pad_offset);
672 case MDEREF_INDEX_gvsv:
673 esv = UNOP_AUX_item_sv(++items);
674 XSH_ASSERT(isGV_with_GP(esv));
675 esv = GvSVn((GV *) esv);
677 if (UNLIKELY(SvROK(esv) && !SvGAMAGIC(esv) && ckWARN(WARN_MISC)))
678 Perl_warner(aTHX_ packWARN(WARN_MISC),
679 "Use of reference \"%"SVf"\" as array index",
683 PL_multideref_pc = items;
684 if (actions & MDEREF_FLAG_last) {
685 switch (flags & A_HINT_DO) {
687 sv = a_do_pp_afetch(sv, esv);
690 sv = a_do_pp_afetch_lv(sv, esv);
693 sv = a_do_pp_aexists(sv, esv);
696 sv = a_do_pp_adelete(sv, esv);
701 sv = a_do_pp_afetch(sv, esv);
704 case MDEREF_HV_padhv_helem: /* $lex{...} */
705 sv = PAD_SVl((++items)->pad_offset);
709 case MDEREF_HV_gvhv_helem: /* $pkg{...} */
710 sv = UNOP_AUX_item_sv(++items);
711 XSH_ASSERT(isGV_with_GP(sv));
712 sv = (SV *) GvHVn((GV *) sv);
716 case MDEREF_HV_pop_rv2hv_helem: /* expr->{...} */
720 goto do_HV_rv2hv_helem;
721 case MDEREF_HV_gvsv_vivify_rv2hv_helem: /* $pkg->{...} */
722 sv = UNOP_AUX_item_sv(++items);
723 XSH_ASSERT(isGV_with_GP(sv));
724 sv = GvSVn((GV *) sv);
727 goto do_HV_vivify_rv2hv_helem;
728 case MDEREF_HV_padsv_vivify_rv2hv_helem: /* $lex->{...} */
729 sv = PAD_SVl((++items)->pad_offset);
731 case MDEREF_HV_vivify_rv2hv_helem: /* vivify, ->{...} */
734 do_HV_vivify_rv2hv_helem:
735 sv = a_vivify_ref(sv, 1);
737 sv = a_do_pp_rv2hv(sv);
741 XSH_ASSERT(SvTYPE(sv) == SVt_PVHV);
742 switch (actions & MDEREF_INDEX_MASK) {
743 case MDEREF_INDEX_none:
745 case MDEREF_INDEX_const:
746 key = UNOP_AUX_item_sv(++items);
748 case MDEREF_INDEX_padsv:
749 key = PAD_SVl((++items)->pad_offset);
751 case MDEREF_INDEX_gvsv:
752 key = UNOP_AUX_item_sv(++items);
753 XSH_ASSERT(isGV_with_GP(key));
754 key = GvSVn((GV *) key);
757 PL_multideref_pc = items;
758 if (actions & MDEREF_FLAG_last) {
759 switch (flags & A_HINT_DO) {
761 sv = a_do_pp_hfetch(sv, key);
764 sv = a_do_pp_hfetch_lv(sv, key);
767 sv = a_do_pp_hexists(sv, key);
770 sv = a_do_pp_hdelete(sv, key);
777 sv = a_do_pp_hfetch(sv, key);
782 actions >>= MDEREF_SHIFT;
786 if (flags & (A_HINT_NOTIFY|A_HINT_STORE))
787 a_cannot_vivify(flags);
788 if (flags & A_HINT_EXISTS)
797 #endif /* A_HAS_MULTIDEREF */
799 /* --- Check functions ----------------------------------------------------- */
801 static void a_recheck_rv2xv(pTHX_ OP *o, OPCODE type, OP *(*new_pp)(pTHX)) {
802 #define a_recheck_rv2xv(O, T, PP) a_recheck_rv2xv(aTHX_ (O), (T), (PP))
804 if (o->op_type == type && o->op_ppaddr != new_pp
805 && cUNOPo->op_first->op_type != OP_GV) {
807 const a_op_info *oi = a_map_fetch(o);
809 a_map_store(o, o->op_ppaddr, oi->next, oi->flags);
810 o->op_ppaddr = new_pp;
817 /* ... ck_pad{any,sv} ...................................................... */
819 /* Sadly, the padsv OPs we are interested in don't trigger the padsv check
820 * function, but are instead manually mutated from a padany. So we store
821 * the op entry in the op map in the padany check function, and we set their
822 * op_ppaddr member in our peephole optimizer replacement below. */
824 static OP *(*a_old_ck_padany)(pTHX_ OP *) = 0;
826 static OP *a_ck_padany(pTHX_ OP *o) {
829 o = a_old_ck_padany(aTHX_ o);
832 if (hint & A_HINT_DO)
833 a_map_store_root(o, o->op_ppaddr, hint);
840 static OP *(*a_old_ck_padsv)(pTHX_ OP *) = 0;
842 static OP *a_ck_padsv(pTHX_ OP *o) {
845 o = a_old_ck_padsv(aTHX_ o);
848 if (hint & A_HINT_DO) {
849 a_map_store_root(o, o->op_ppaddr, hint);
850 o->op_ppaddr = a_pp_deref;
857 /* ... ck_deref (aelem,helem,rv2sv) ........................................ */
859 /* Those ops appear both at the root and inside an expression but there's no
860 * way to distinguish both situations. Worse, we can't even know if we are in a
861 * modifying context, so the expression can't be resolved yet. It will be at the
862 * first invocation of a_pp_deref() for this expression. */
864 static OP *(*a_old_ck_aelem)(pTHX_ OP *) = 0;
865 static OP *(*a_old_ck_helem)(pTHX_ OP *) = 0;
866 static OP *(*a_old_ck_rv2sv)(pTHX_ OP *) = 0;
868 static OP *a_ck_deref(pTHX_ OP *o) {
869 OP * (*old_ck)(pTHX_ OP *o) = 0;
872 switch (o->op_type) {
874 old_ck = a_old_ck_aelem;
875 if ((hint & A_HINT_DO) && !(hint & A_HINT_STRICT))
876 a_recheck_rv2xv(cUNOPo->op_first, OP_RV2AV, a_pp_rv2av);
879 old_ck = a_old_ck_helem;
880 if ((hint & A_HINT_DO) && !(hint & A_HINT_STRICT))
881 a_recheck_rv2xv(cUNOPo->op_first, OP_RV2HV, a_pp_rv2hv_simple);
884 old_ck = a_old_ck_rv2sv;
890 if (old_ck == a_old_ck_rv2sv && o->op_flags & OPf_KIDS) {
891 OP *kid = cUNOPo->op_first;
892 if (kid && kid->op_type == OP_GV) {
893 if (hint & A_HINT_DO)
894 a_map_store(kid, kid->op_ppaddr, NULL, hint);
901 if (hint & A_HINT_DO) {
902 a_map_store_root(o, o->op_ppaddr, hint);
903 o->op_ppaddr = a_pp_deref;
910 /* ... ck_rv2xv (rv2av,rv2hv) .............................................. */
912 /* Those ops also appear both inisde and at the root, hence the caveats for
913 * a_ck_deref() still apply here. Since a padsv/rv2sv must appear before a
914 * rv2[ah]v, resolution is handled by the first call to a_pp_deref() in the
917 static OP *(*a_old_ck_rv2av)(pTHX_ OP *) = 0;
918 static OP *(*a_old_ck_rv2hv)(pTHX_ OP *) = 0;
920 static OP *a_ck_rv2xv(pTHX_ OP *o) {
921 OP * (*old_ck)(pTHX_ OP *o) = 0;
922 OP * (*new_pp)(pTHX) = 0;
925 switch (o->op_type) {
926 case OP_RV2AV: old_ck = a_old_ck_rv2av; new_pp = a_pp_rv2av; break;
927 case OP_RV2HV: old_ck = a_old_ck_rv2hv; new_pp = a_pp_rv2hv_simple; break;
931 if (cUNOPo->op_first->op_type == OP_GV)
935 if (hint & A_HINT_DO && !(hint & A_HINT_STRICT)) {
936 a_map_store_root(o, o->op_ppaddr, hint);
937 o->op_ppaddr = new_pp;
944 /* ... ck_xslice (aslice,hslice) ........................................... */
946 /* I think those are only found at the root, but there's nothing that really
947 * prevent them to be inside the expression too. We only need to update the
948 * root so that the rest of the expression will see the right context when
949 * resolving. That's why we don't replace the ppaddr. */
951 static OP *(*a_old_ck_aslice)(pTHX_ OP *) = 0;
952 static OP *(*a_old_ck_hslice)(pTHX_ OP *) = 0;
954 static OP *a_ck_xslice(pTHX_ OP *o) {
955 OP * (*old_ck)(pTHX_ OP *o) = 0;
958 switch (o->op_type) {
960 old_ck = a_old_ck_aslice;
963 old_ck = a_old_ck_hslice;
964 if (hint & A_HINT_DO)
965 a_recheck_rv2xv(OpSIBLING(cUNOPo->op_first), OP_RV2HV, a_pp_rv2hv);
970 if (hint & A_HINT_DO) {
971 a_map_store_root(o, 0, hint);
978 /* ... ck_root (exists,delete,keys,values) ................................. */
980 /* Those ops are only found at the root of a dereferencing expression. We can
981 * then resolve at compile time if vivification must take place or not. */
983 static OP *(*a_old_ck_exists)(pTHX_ OP *) = 0;
984 static OP *(*a_old_ck_delete)(pTHX_ OP *) = 0;
985 static OP *(*a_old_ck_keys) (pTHX_ OP *) = 0;
986 static OP *(*a_old_ck_values)(pTHX_ OP *) = 0;
988 static OP *a_ck_root(pTHX_ OP *o) {
989 OP * (*old_ck)(pTHX_ OP *o) = 0;
990 OP * (*new_pp)(pTHX) = 0;
994 switch (o->op_type) {
996 old_ck = a_old_ck_exists;
997 new_pp = a_pp_root_binop;
998 enabled = hint & A_HINT_EXISTS;
1001 old_ck = a_old_ck_delete;
1002 new_pp = a_pp_root_binop;
1003 enabled = hint & A_HINT_DELETE;
1006 old_ck = a_old_ck_keys;
1007 new_pp = a_pp_root_unop;
1008 enabled = hint & A_HINT_KEYS;
1011 old_ck = a_old_ck_values;
1012 new_pp = a_pp_root_unop;
1013 enabled = hint & A_HINT_VALUES;
1016 o = old_ck(aTHX_ o);
1018 if (hint & A_HINT_DO) {
1020 a_map_update_flags_topdown(o, hint | A_HINT_DEREF);
1021 a_map_store_root(o, o->op_ppaddr, hint);
1022 o->op_ppaddr = new_pp;
1032 /* --- Our peephole optimizer ---------------------------------------------- */
1034 static void xsh_peep_rec(pTHX_ OP *o, ptable *seen) {
1035 for (; o; o = o->op_next) {
1037 const a_op_info *oi = NULL;
1040 if (xsh_peep_seen(o, seen))
1043 switch (o->op_type) {
1045 if (o->op_ppaddr != a_pp_deref) {
1046 oi = a_map_fetch(o);
1047 if (oi && (oi->flags & A_HINT_DO)) {
1048 a_map_store(o, o->op_ppaddr, oi->next, oi->flags);
1049 o->op_ppaddr = a_pp_deref;
1057 if (o->op_ppaddr != a_pp_deref)
1059 oi = a_map_fetch(o);
1063 if (!(flags & A_HINT_DEREF)
1064 && (flags & A_HINT_DO)
1065 && (o->op_private & OPpDEREF || flags & A_HINT_ROOT)) {
1066 /* Decide if the expression must autovivify or not. */
1067 flags = a_map_resolve(o, oi);
1069 if (flags & A_HINT_DEREF)
1070 o->op_private = ((o->op_private & ~OPpDEREF) | OPpLVAL_DEFER);
1072 o->op_ppaddr = oi->old_pp;
1076 if ( o->op_ppaddr != a_pp_rv2av
1077 && o->op_ppaddr != a_pp_rv2hv
1078 && o->op_ppaddr != a_pp_rv2hv_simple)
1080 oi = a_map_fetch(o);
1083 if (!(oi->flags & A_HINT_DEREF))
1084 o->op_ppaddr = oi->old_pp;
1086 #if A_HAS_MULTIDEREF
1088 if (o->op_ppaddr != a_pp_multideref) {
1089 oi = a_map_fetch(cUNOPo->op_first);
1093 if (a_do_multideref(o, flags)) {
1094 a_map_store_root(o, o->op_ppaddr, flags & ~A_HINT_DEREF);
1095 o->op_ppaddr = a_pp_multideref;
1101 xsh_peep_maybe_recurse(o, seen);
1107 /* --- Module setup/teardown ----------------------------------------------- */
1109 static void xsh_user_global_setup(pTHX) {
1110 a_op_map = ptable_new(32);
1113 MUTEX_INIT(&a_op_map_mutex);
1116 xsh_ck_replace(OP_PADANY, a_ck_padany, &a_old_ck_padany);
1117 xsh_ck_replace(OP_PADSV, a_ck_padsv, &a_old_ck_padsv);
1119 xsh_ck_replace(OP_AELEM, a_ck_deref, &a_old_ck_aelem);
1120 xsh_ck_replace(OP_HELEM, a_ck_deref, &a_old_ck_helem);
1121 xsh_ck_replace(OP_RV2SV, a_ck_deref, &a_old_ck_rv2sv);
1123 xsh_ck_replace(OP_RV2AV, a_ck_rv2xv, &a_old_ck_rv2av);
1124 xsh_ck_replace(OP_RV2HV, a_ck_rv2xv, &a_old_ck_rv2hv);
1126 xsh_ck_replace(OP_ASLICE, a_ck_xslice, &a_old_ck_aslice);
1127 xsh_ck_replace(OP_HSLICE, a_ck_xslice, &a_old_ck_hslice);
1129 xsh_ck_replace(OP_EXISTS, a_ck_root, &a_old_ck_exists);
1130 xsh_ck_replace(OP_DELETE, a_ck_root, &a_old_ck_delete);
1131 xsh_ck_replace(OP_KEYS, a_ck_root, &a_old_ck_keys);
1132 xsh_ck_replace(OP_VALUES, a_ck_root, &a_old_ck_values);
1137 static void xsh_user_local_setup(pTHX) {
1140 stash = gv_stashpvn(XSH_PACKAGE, XSH_PACKAGE_LEN, 1);
1141 newCONSTSUB(stash, "A_HINT_STRICT", newSVuv(A_HINT_STRICT));
1142 newCONSTSUB(stash, "A_HINT_WARN", newSVuv(A_HINT_WARN));
1143 newCONSTSUB(stash, "A_HINT_FETCH", newSVuv(A_HINT_FETCH));
1144 newCONSTSUB(stash, "A_HINT_STORE", newSVuv(A_HINT_STORE));
1145 newCONSTSUB(stash, "A_HINT_KEYS", newSVuv(A_HINT_KEYS));
1146 newCONSTSUB(stash, "A_HINT_VALUES", newSVuv(A_HINT_VALUES));
1147 newCONSTSUB(stash, "A_HINT_EXISTS", newSVuv(A_HINT_EXISTS));
1148 newCONSTSUB(stash, "A_HINT_DELETE", newSVuv(A_HINT_DELETE));
1149 newCONSTSUB(stash, "A_HINT_MASK", newSVuv(A_HINT_MASK));
1150 newCONSTSUB(stash, "A_THREADSAFE", newSVuv(XSH_THREADSAFE));
1151 newCONSTSUB(stash, "A_FORKSAFE", newSVuv(XSH_FORKSAFE));
1156 static void xsh_user_local_teardown(pTHX) {
1160 static void xsh_user_global_teardown(pTHX) {
1161 xsh_ck_restore(OP_PADANY, &a_old_ck_padany);
1162 xsh_ck_restore(OP_PADSV, &a_old_ck_padsv);
1164 xsh_ck_restore(OP_AELEM, &a_old_ck_aelem);
1165 xsh_ck_restore(OP_HELEM, &a_old_ck_helem);
1166 xsh_ck_restore(OP_RV2SV, &a_old_ck_rv2sv);
1168 xsh_ck_restore(OP_RV2AV, &a_old_ck_rv2av);
1169 xsh_ck_restore(OP_RV2HV, &a_old_ck_rv2hv);
1171 xsh_ck_restore(OP_ASLICE, &a_old_ck_aslice);
1172 xsh_ck_restore(OP_HSLICE, &a_old_ck_hslice);
1174 xsh_ck_restore(OP_EXISTS, &a_old_ck_exists);
1175 xsh_ck_restore(OP_DELETE, &a_old_ck_delete);
1176 xsh_ck_restore(OP_KEYS, &a_old_ck_keys);
1177 xsh_ck_restore(OP_VALUES, &a_old_ck_values);
1179 ptable_map_free(a_op_map);
1183 MUTEX_DESTROY(&a_op_map_mutex);
1189 /* --- XS ------------------------------------------------------------------ */
1191 MODULE = autovivification PACKAGE = autovivification
1209 #endif /* XSH_THREADSAFE */
1215 RETVAL = xsh_hints_tag(SvOK(hint) ? SvUV(hint) : 0);
1225 RETVAL = newSVuv(xsh_hints_detag(tag));