1 /* This file is part of the indirect Perl module.
2 * See http://search.cpan.org/dist/indirect/ */
4 #define PERL_NO_GET_CONTEXT
9 #define __PACKAGE__ "indirect"
10 #define __PACKAGE_LEN__ (sizeof(__PACKAGE__)-1)
12 /* --- Compatibility wrappers ---------------------------------------------- */
23 # define Newx(v, n, c) New(0, v, n, c)
27 # define SvPV_const SvPV
30 #ifndef SvPV_nolen_const
31 # define SvPV_nolen_const SvPV_nolen
35 # define SvPVX_const SvPVX
38 #ifndef SvREFCNT_inc_simple_NN
39 # define SvREFCNT_inc_simple_NN SvREFCNT_inc
42 #ifndef sv_catpvn_nomg
43 # define sv_catpvn_nomg sv_catpvn
47 # define mPUSHp(P, L) PUSHs(sv_2mortal(newSVpvn((P), (L))))
51 # define mPUSHu(U) PUSHs(sv_2mortal(newSVuv(U)))
55 # define HvNAME_get(H) HvNAME(H)
59 # define HvNAMELEN_get(H) strlen(HvNAME_get(H))
62 #define I_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
64 #if I_HAS_PERL(5, 10, 0) || defined(PL_parser)
66 # define PL_linestr PL_parser->linestr
69 # define PL_bufptr PL_parser->bufptr
72 # define PL_oldbufptr PL_parser->oldbufptr
76 # define PL_linestr PL_Ilinestr
79 # define PL_bufptr PL_Ibufptr
82 # define PL_oldbufptr PL_Ioldbufptr
86 #ifndef I_WORKAROUND_REQUIRE_PROPAGATION
87 # define I_WORKAROUND_REQUIRE_PROPAGATION !I_HAS_PERL(5, 12, 0)
90 /* ... Thread safety and multiplicity ...................................... */
92 /* Safe unless stated otherwise in Makefile.PL */
97 #ifndef I_MULTIPLICITY
98 # if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
99 # define I_MULTIPLICITY 1
101 # define I_MULTIPLICITY 0
104 #if I_MULTIPLICITY && !defined(tTHX)
105 # define tTHX PerlInterpreter*
108 #if I_MULTIPLICITY && defined(USE_ITHREADS) && defined(dMY_CXT) && defined(MY_CXT) && defined(START_MY_CXT) && defined(MY_CXT_INIT) && (defined(MY_CXT_CLONE) || defined(dMY_CXT_SV))
109 # define I_THREADSAFE 1
110 # ifndef MY_CXT_CLONE
111 # define MY_CXT_CLONE \
113 my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
114 Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
115 sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
118 # define I_THREADSAFE 0
120 # define dMY_CXT dNOOP
122 # define MY_CXT indirect_globaldata
124 # define START_MY_CXT STATIC my_cxt_t MY_CXT;
126 # define MY_CXT_INIT NOOP
128 # define MY_CXT_CLONE NOOP
131 /* --- Helpers ------------------------------------------------------------- */
133 /* ... Thread-safe hints ................................................... */
135 #if I_WORKAROUND_REQUIRE_PROPAGATION
142 #define I_HINT_STRUCT 1
144 #define I_HINT_CODE(H) ((H)->code)
146 #define I_HINT_FREE(H) { \
147 indirect_hint_t *h = (H); \
148 SvREFCNT_dec(h->code); \
149 PerlMemShared_free(h); \
152 #else /* I_WORKAROUND_REQUIRE_PROPAGATION */
154 typedef SV indirect_hint_t;
156 #define I_HINT_STRUCT 0
158 #define I_HINT_CODE(H) (H)
160 #define I_HINT_FREE(H) SvREFCNT_dec(H);
162 #endif /* !I_WORKAROUND_REQUIRE_PROPAGATION */
166 #define PTABLE_NAME ptable_hints
167 #define PTABLE_VAL_FREE(V) I_HINT_FREE(V)
176 #define ptable_hints_store(T, K, V) ptable_hints_store(aTHX_ (T), (K), (V))
177 #define ptable_hints_free(T) ptable_hints_free(aTHX_ (T))
179 #endif /* I_THREADSAFE */
181 /* Define the op->str ptable here because we need to be able to clean it during
190 } indirect_op_info_t;
192 #define PTABLE_NAME ptable
193 #define PTABLE_VAL_FREE(V) if (V) { Safefree(((indirect_op_info_t *) (V))->buf); Safefree(V); }
202 #define ptable_store(T, K, V) ptable_store(aTHX_ (T), (K), (V))
203 #define ptable_delete(T, K) ptable_delete(aTHX_ (T), (K))
204 #define ptable_clear(T) ptable_clear(aTHX_ (T))
205 #define ptable_free(T) ptable_free(aTHX_ (T))
207 #define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
211 ptable *tbl; /* It really is a ptable_hints */
221 STATIC SV *indirect_clone(pTHX_ SV *sv, tTHX owner) {
222 #define indirect_clone(S, O) indirect_clone(aTHX_ (S), (O))
227 if (SvTYPE(sv) == SVt_PVHV && HvNAME_get(sv))
230 param.stashes = stashes;
232 param.proto_perl = owner;
234 dupsv = sv_dup(sv, ¶m);
238 SvREFCNT_dec(stashes);
241 return SvREFCNT_inc(dupsv);
244 STATIC void indirect_ptable_clone(pTHX_ ptable_ent *ent, void *ud_) {
246 indirect_hint_t *h1 = ent->val;
249 if (ud->owner == aTHX)
254 h2 = PerlMemShared_malloc(sizeof *h2);
255 h2->code = indirect_clone(h1->code, ud->owner);
256 SvREFCNT_inc(h2->code);
257 #if I_WORKAROUND_REQUIRE_PROPAGATION
258 h2->require_tag = PTR2IV(indirect_clone(INT2PTR(SV *, h1->require_tag),
262 #else /* I_HINT_STRUCT */
264 h2 = indirect_clone(h1, ud->owner);
267 #endif /* !I_HINT_STRUCT */
269 ptable_hints_store(ud->tbl, ent->key, h2);
274 STATIC void indirect_thread_cleanup(pTHX_ void *ud) {
277 ptable_free(MY_CXT.map);
278 ptable_hints_free(MY_CXT.tbl);
281 #endif /* I_THREADSAFE */
283 #if I_WORKAROUND_REQUIRE_PROPAGATION
284 STATIC IV indirect_require_tag(pTHX) {
285 #define indirect_require_tag() indirect_require_tag(aTHX)
286 const CV *cv, *outside;
291 /* If for some reason the pragma is operational at run-time, try to discover
292 * the current cv in use. */
295 for (si = PL_curstackinfo; si; si = si->si_prev) {
298 for (cxix = si->si_cxix; cxix >= 0; --cxix) {
299 const PERL_CONTEXT *cx = si->si_cxstack + cxix;
301 switch (CxTYPE(cx)) {
304 /* The propagation workaround is only needed up to 5.10.0 and at that
305 * time format and sub contexts were still identical. And even later the
306 * cv members offsets should have been kept the same. */
308 goto get_enclosing_cv;
310 cv = cx->blk_eval.cv;
311 goto get_enclosing_cv;
322 for (outside = CvOUTSIDE(cv); outside; outside = CvOUTSIDE(cv))
327 #endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
329 STATIC SV *indirect_tag(pTHX_ SV *value) {
330 #define indirect_tag(V) indirect_tag(aTHX_ (V))
336 if (SvTYPE(value) >= SVt_PVCV) {
338 SvREFCNT_inc_simple_NN(code);
343 h = PerlMemShared_malloc(sizeof *h);
345 # if I_WORKAROUND_REQUIRE_PROPAGATION
346 h->require_tag = indirect_require_tag();
347 # endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
348 #else /* I_HINT_STRUCT */
350 #endif /* !I_HINT_STRUCT */
355 /* We only need for the key to be an unique tag for looking up the value later
356 * Allocated memory provides convenient unique identifiers, so that's why we
357 * use the hint as the key itself. */
358 ptable_hints_store(MY_CXT.tbl, h, h);
360 #endif /* I_THREADSAFE */
362 return newSViv(PTR2IV(h));
365 STATIC SV *indirect_detag(pTHX_ const SV *hint) {
366 #define indirect_detag(H) indirect_detag(aTHX_ (H))
369 if (!(hint && SvIOK(hint)))
372 h = INT2PTR(indirect_hint_t *, SvIVX(hint));
376 h = ptable_fetch(MY_CXT.tbl, h);
378 #endif /* I_THREADSAFE */
380 #if I_WORKAROUND_REQUIRE_PROPAGATION
381 if (indirect_require_tag() != h->require_tag)
383 #endif /* I_WORKAROUND_REQUIRE_PROPAGATION */
385 return I_HINT_CODE(h);
388 STATIC U32 indirect_hash = 0;
390 STATIC SV *indirect_hint(pTHX) {
391 #define indirect_hint() indirect_hint(aTHX)
397 val = hv_fetch(GvHV(PL_hintgv), __PACKAGE__, __PACKAGE_LEN__, indirect_hash);
401 return indirect_detag(*val);
404 /* ... op -> source position ............................................... */
406 STATIC void indirect_map_store(pTHX_ const OP *o, STRLEN pos, SV *sv, line_t line) {
407 #define indirect_map_store(O, P, N, L) indirect_map_store(aTHX_ (O), (P), (N), (L))
408 indirect_op_info_t *oi;
413 if (!(oi = ptable_fetch(MY_CXT.map, o))) {
414 Newx(oi, 1, indirect_op_info_t);
415 ptable_store(MY_CXT.map, o, oi);
421 s = SvPV_const(sv, len);
427 if (len > oi->size) {
429 Newx(oi->buf, len, char);
432 Copy(s, oi->buf, len, char);
439 STATIC const indirect_op_info_t *indirect_map_fetch(pTHX_ const OP *o) {
440 #define indirect_map_fetch(O) indirect_map_fetch(aTHX_ (O))
443 return ptable_fetch(MY_CXT.map, o);
446 STATIC void indirect_map_delete(pTHX_ const OP *o) {
447 #define indirect_map_delete(O) indirect_map_delete(aTHX_ (O))
450 ptable_delete(MY_CXT.map, o);
453 /* --- Check functions ----------------------------------------------------- */
455 STATIC int indirect_find(pTHX_ SV *sv, const char *s, STRLEN *pos) {
456 #define indirect_find(N, S, P) indirect_find(aTHX_ (N), (S), (P))
458 const char *p, *r = SvPV_const(sv, len);
460 if (len >= 1 && *r == '$') {
473 if (!isALNUM(p[len]))
475 /* p points to a word that has r as prefix, skip the rest of the word */
481 *pos = p - SvPVX_const(PL_linestr);
486 /* ... ck_const ............................................................ */
488 STATIC OP *(*indirect_old_ck_const)(pTHX_ OP *) = 0;
490 STATIC OP *indirect_ck_const(pTHX_ OP *o) {
491 o = indirect_old_ck_const(aTHX_ o);
493 if (indirect_hint()) {
496 if (SvPOK(sv) && (SvTYPE(sv) >= SVt_PV)) {
499 if (indirect_find(sv, PL_oldbufptr, &pos)) {
500 indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
506 indirect_map_delete(o);
510 /* ... ck_rv2sv ............................................................ */
512 STATIC OP *(*indirect_old_ck_rv2sv)(pTHX_ OP *) = 0;
514 STATIC OP *indirect_ck_rv2sv(pTHX_ OP *o) {
515 if (indirect_hint()) {
516 OP *op = cUNOPo->op_first;
518 const char *name = NULL;
520 OPCODE type = (OPCODE) op->op_type;
525 GV *gv = cGVOPx_gv(op);
531 if ((PL_opargs[type] & OA_CLASS_MASK) == OA_SVOP) {
532 SV *nsv = cSVOPx_sv(op);
533 if (SvPOK(nsv) && (SvTYPE(nsv) >= SVt_PV))
534 name = SvPV_const(nsv, len);
540 sv = sv_2mortal(newSVpvn("$", 1));
541 sv_catpvn_nomg(sv, name, len);
542 if (!indirect_find(sv, PL_oldbufptr, &pos)) {
543 /* If it failed, retry without the current stash */
544 const char *stash = HvNAME_get(PL_curstash);
545 STRLEN stashlen = HvNAMELEN_get(PL_curstash);
547 if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
548 || name[stashlen] != ':' || name[stashlen+1] != ':') {
549 /* Failed again ? Try to remove main */
552 if ((len < stashlen + 2) || strnNE(name, stash, stashlen)
553 || name[stashlen] != ':' || name[stashlen+1] != ':')
557 sv_setpvn(sv, "$", 1);
559 sv_catpvn_nomg(sv, name + stashlen, len - stashlen);
560 if (!indirect_find(sv, PL_oldbufptr, &pos))
564 o = indirect_old_ck_rv2sv(aTHX_ o);
566 indirect_map_store(o, pos, sv, CopLINE(&PL_compiling));
571 o = indirect_old_ck_rv2sv(aTHX_ o);
573 indirect_map_delete(o);
577 /* ... ck_padany ........................................................... */
579 STATIC OP *(*indirect_old_ck_padany)(pTHX_ OP *) = 0;
581 STATIC OP *indirect_ck_padany(pTHX_ OP *o) {
582 o = indirect_old_ck_padany(aTHX_ o);
584 if (indirect_hint()) {
586 const char *s = PL_oldbufptr, *t = PL_bufptr - 1;
588 while (s < t && isSPACE(*s)) ++s;
589 if (*s == '$' && ++s <= t) {
590 while (s < t && isSPACE(*s)) ++s;
591 while (s < t && isSPACE(*t)) --t;
592 sv = sv_2mortal(newSVpvn("$", 1));
593 sv_catpvn_nomg(sv, s, t - s + 1);
594 indirect_map_store(o, s - SvPVX_const(PL_linestr),
595 sv, CopLINE(&PL_compiling));
600 indirect_map_delete(o);
604 /* ... ck_scope ............................................................ */
606 STATIC OP *(*indirect_old_ck_scope) (pTHX_ OP *) = 0;
607 STATIC OP *(*indirect_old_ck_lineseq)(pTHX_ OP *) = 0;
609 STATIC OP *indirect_ck_scope(pTHX_ OP *o) {
610 OP *(*old_ck)(pTHX_ OP *) = 0;
612 switch (o->op_type) {
613 case OP_SCOPE: old_ck = indirect_old_ck_scope; break;
614 case OP_LINESEQ: old_ck = indirect_old_ck_lineseq; break;
618 if (indirect_hint()) {
619 indirect_map_store(o, PL_oldbufptr - SvPVX_const(PL_linestr),
620 NULL, CopLINE(&PL_compiling));
624 indirect_map_delete(o);
628 /* We don't need to clean the map entries for leave ops because they can only
629 * be created by mutating from a lineseq. */
631 /* ... ck_method ........................................................... */
633 STATIC OP *(*indirect_old_ck_method)(pTHX_ OP *) = 0;
635 STATIC OP *indirect_ck_method(pTHX_ OP *o) {
636 if (indirect_hint()) {
637 OP *op = cUNOPo->op_first;
639 /* Indirect method call is only possible when the method is a bareword, so
640 * don't trip up on $obj->$meth. */
641 if (op && op->op_type == OP_CONST) {
642 const indirect_op_info_t *oi = indirect_map_fetch(op);
650 sv = sv_2mortal(newSVpvn(oi->buf, oi->len));
652 /* Keep the old line so that we really point to the first line of the
656 o = indirect_old_ck_method(aTHX_ o);
657 /* o may now be a method_named */
659 indirect_map_store(o, pos, sv, line);
665 o = indirect_old_ck_method(aTHX_ o);
667 indirect_map_delete(o);
671 /* ... ck_method_named ..................................................... */
673 /* "use foo/no foo" compiles its call to import/unimport directly to a
674 * method_named op. */
676 STATIC OP *(*indirect_old_ck_method_named)(pTHX_ OP *) = 0;
678 STATIC OP *indirect_ck_method_named(pTHX_ OP *o) {
679 if (indirect_hint()) {
685 if (!SvPOK(sv) || (SvTYPE(sv) < SVt_PV))
687 sv = sv_mortalcopy(sv);
689 if (!indirect_find(sv, PL_oldbufptr, &pos))
691 line = CopLINE(&PL_compiling);
693 o = indirect_old_ck_method_named(aTHX_ o);
695 indirect_map_store(o, pos, sv, line);
700 o = indirect_old_ck_method_named(aTHX_ o);
702 indirect_map_delete(o);
706 /* ... ck_entersub ......................................................... */
708 STATIC OP *(*indirect_old_ck_entersub)(pTHX_ OP *) = 0;
710 STATIC OP *indirect_ck_entersub(pTHX_ OP *o) {
711 SV *code = indirect_hint();
713 o = indirect_old_ck_entersub(aTHX_ o);
716 const indirect_op_info_t *moi, *ooi;
722 lop = (LISTOP *) oop;
723 if (!(lop->op_flags & OPf_KIDS))
726 } while (oop->op_type != OP_PUSHMARK);
727 oop = oop->op_sibling;
733 switch (oop->op_type) {
744 if (mop->op_type == OP_METHOD)
745 mop = cUNOPx(mop)->op_first;
746 else if (mop->op_type != OP_METHOD_NAMED)
749 moi = indirect_map_fetch(mop);
753 ooi = indirect_map_fetch(oop);
757 /* When positions are identical, the method and the object must have the
758 * same name. But it also means that it is an indirect call, as "foo->foo"
759 * results in different positions. */
760 if (moi->pos <= ooi->pos) {
768 file = sv_2mortal(newSVpv(CopFILE(&PL_compiling), 0));
770 file = sv_mortalcopy(CopFILESV(&PL_compiling));
775 mPUSHp(ooi->buf, ooi->len);
776 mPUSHp(moi->buf, moi->len);
781 call_sv(code, G_VOID);
794 STATIC U32 indirect_initialized = 0;
796 STATIC void indirect_teardown(pTHX_ void *root) {
797 if (!indirect_initialized)
807 ptable_free(MY_CXT.map);
809 ptable_hints_free(MY_CXT.tbl);
813 PL_check[OP_CONST] = MEMBER_TO_FPTR(indirect_old_ck_const);
814 indirect_old_ck_const = 0;
815 PL_check[OP_RV2SV] = MEMBER_TO_FPTR(indirect_old_ck_rv2sv);
816 indirect_old_ck_rv2sv = 0;
817 PL_check[OP_PADANY] = MEMBER_TO_FPTR(indirect_old_ck_padany);
818 indirect_old_ck_padany = 0;
819 PL_check[OP_SCOPE] = MEMBER_TO_FPTR(indirect_old_ck_scope);
820 indirect_old_ck_scope = 0;
821 PL_check[OP_LINESEQ] = MEMBER_TO_FPTR(indirect_old_ck_lineseq);
822 indirect_old_ck_lineseq = 0;
824 PL_check[OP_METHOD] = MEMBER_TO_FPTR(indirect_old_ck_method);
825 indirect_old_ck_method = 0;
826 PL_check[OP_METHOD_NAMED] = MEMBER_TO_FPTR(indirect_old_ck_method_named);
827 indirect_old_ck_method_named = 0;
828 PL_check[OP_ENTERSUB] = MEMBER_TO_FPTR(indirect_old_ck_entersub);
829 indirect_old_ck_entersub = 0;
831 indirect_initialized = 0;
834 STATIC void indirect_setup(pTHX) {
835 #define indirect_setup() indirect_setup(aTHX)
836 if (indirect_initialized)
842 MY_CXT.tbl = ptable_new();
845 MY_CXT.map = ptable_new();
848 indirect_old_ck_const = PL_check[OP_CONST];
849 PL_check[OP_CONST] = MEMBER_TO_FPTR(indirect_ck_const);
850 indirect_old_ck_rv2sv = PL_check[OP_RV2SV];
851 PL_check[OP_RV2SV] = MEMBER_TO_FPTR(indirect_ck_rv2sv);
852 indirect_old_ck_padany = PL_check[OP_PADANY];
853 PL_check[OP_PADANY] = MEMBER_TO_FPTR(indirect_ck_padany);
854 indirect_old_ck_scope = PL_check[OP_SCOPE];
855 PL_check[OP_SCOPE] = MEMBER_TO_FPTR(indirect_ck_scope);
856 indirect_old_ck_lineseq = PL_check[OP_LINESEQ];
857 PL_check[OP_LINESEQ] = MEMBER_TO_FPTR(indirect_ck_scope);
859 indirect_old_ck_method = PL_check[OP_METHOD];
860 PL_check[OP_METHOD] = MEMBER_TO_FPTR(indirect_ck_method);
861 indirect_old_ck_method_named = PL_check[OP_METHOD_NAMED];
862 PL_check[OP_METHOD_NAMED] = MEMBER_TO_FPTR(indirect_ck_method_named);
863 indirect_old_ck_entersub = PL_check[OP_ENTERSUB];
864 PL_check[OP_ENTERSUB] = MEMBER_TO_FPTR(indirect_ck_entersub);
867 call_atexit(indirect_teardown, aTHX);
869 call_atexit(indirect_teardown, NULL);
872 indirect_initialized = 1;
875 STATIC U32 indirect_booted = 0;
877 /* --- XS ------------------------------------------------------------------ */
879 MODULE = indirect PACKAGE = indirect
885 if (!indirect_booted++) {
888 PERL_HASH(indirect_hash, __PACKAGE__, __PACKAGE_LEN__);
890 stash = gv_stashpvn(__PACKAGE__, __PACKAGE_LEN__, 1);
891 newCONSTSUB(stash, "I_THREADSAFE", newSVuv(I_THREADSAFE));
892 newCONSTSUB(stash, "I_FORKSAFE", newSVuv(I_FORKSAFE));
909 ud.tbl = t = ptable_new();
910 ud.owner = MY_CXT.owner;
911 ptable_walk(MY_CXT.tbl, indirect_ptable_clone, &ud);
915 MY_CXT.map = ptable_new();
919 reap(3, indirect_thread_cleanup, NULL);
928 RETVAL = indirect_tag(value);