+/* mro.c
+ *
+ * Copyright (c) 2007 Brandon L Black
+ *
+ * You may distribute under the terms of either the GNU General Public
+ * License or the Artistic License, as specified in the README file.
+ *
+ */
+
+/*
+=head1 MRO Functions
+
+These functions are related to the method resolution order of perl classes
+
+=cut
+*/
+
+#include "EXTERN.h"
+#include "perl.h"
+
+struct mro_meta*
+Perl_mro_meta_init(pTHX_ HV* stash)
+{
+ void* newmeta;
+
+ assert(stash);
+ assert(HvAUX(stash));
+ assert(!(HvAUX(stash)->xhv_mro_meta));
+ Newxz(newmeta, sizeof(struct mro_meta), char);
+ HvAUX(stash)->xhv_mro_meta = (struct mro_meta*)newmeta;
+ ((struct mro_meta*)newmeta)->sub_generation = 1;
+
+ /* Manually flag UNIVERSAL as being universal.
+ This happens early in perl booting (when universal.c
+ does the newXS calls for UNIVERSAL::*), and infects
+ other packages as they are added to UNIVERSAL's MRO
+ */
+ if(HvNAMELEN_get(stash) == 9
+ && strEQ(HEK_KEY(HvAUX(stash)->xhv_name), "UNIVERSAL")) {
+ HvMROMETA(stash)->is_universal = 1;
+ }
+
+ return newmeta;
+}
+
+#if defined(USE_ITHREADS)
+
+/* for sv_dup on new threads */
+struct mro_meta*
+Perl_mro_meta_dup(pTHX_ struct mro_meta* smeta, CLONE_PARAMS* param)
+{
+ void* newmeta_void;
+ struct mro_meta* newmeta;
+
+ assert(smeta);
+
+ Newx(newmeta_void, sizeof(struct mro_meta), char);
+ newmeta = (struct mro_meta*)newmeta_void;
+
+ newmeta->mro_which = smeta->mro_which;
+ newmeta->sub_generation = smeta->sub_generation;
+ newmeta->is_universal = smeta->is_universal;
+ newmeta->fake = smeta->fake;
+ newmeta->mro_linear_dfs = smeta->mro_linear_dfs
+ ? (AV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_linear_dfs, param))
+ : 0;
+ newmeta->mro_linear_c3 = smeta->mro_linear_c3
+ ? (AV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_linear_c3, param))
+ : 0;
+ newmeta->mro_isarev = smeta->mro_isarev
+ ? (HV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_isarev, param))
+ : 0;
+ newmeta->mro_nextmethod = smeta->mro_nextmethod
+ ? (HV*) SvREFCNT_inc(sv_dup((SV*)smeta->mro_nextmethod, param))
+ : 0;
+
+ return newmeta;
+}
+
+#endif /* USE_ITHREADS */
+
+/*
+=for apidoc mro_get_linear_isa_dfs
+
+Returns the Depth-First Search linearization of @ISA
+the given stash. The return value is a read-only AV*.
+C<level> should be 0 (it is used internally in this
+function's recursion).
+
+=cut
+*/
+AV*
+Perl_mro_get_linear_isa_dfs(pTHX_ HV *stash, I32 level)
+{
+ AV* retval;
+ GV** gvp;
+ GV* gv;
+ AV* av;
+ SV** svp;
+ I32 items;
+ AV* subrv;
+ SV** subrv_p;
+ I32 subrv_items;
+ const char* stashname;
+ struct mro_meta* meta;
+
+ assert(stash);
+ assert(HvAUX(stash));
+
+ stashname = HvNAME_get(stash);
+ if (!stashname)
+ Perl_croak(aTHX_
+ "Can't linearize anonymous symbol table");
+
+ if (level > 100)
+ Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
+ stashname);
+
+ meta = HvMROMETA(stash);
+ if((retval = meta->mro_linear_dfs)) {
+ /* return cache if valid */
+ return retval;
+ }
+
+ /* not in cache, make a new one */
+ retval = newAV();
+ av_push(retval, newSVpv(stashname, 0)); /* add ourselves at the top */
+
+ gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
+ av = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL;
+
+ if(av) {
+ HV* stored = (HV*)sv_2mortal((SV*)newHV());
+ svp = AvARRAY(av);
+ items = AvFILLp(av) + 1;
+ while (items--) {
+ SV* const sv = *svp++;
+ HV* const basestash = gv_stashsv(sv, 0);
+
+ if (!basestash) {
+ if(!hv_exists_ent(stored, sv, 0)) {
+ av_push(retval, newSVsv(sv));
+ hv_store_ent(stored, sv, &PL_sv_undef, 0);
+ }
+ }
+ else {
+ subrv = mro_get_linear_isa_dfs(basestash, level + 1);
+ subrv_p = AvARRAY(subrv);
+ subrv_items = AvFILLp(subrv) + 1;
+ while(subrv_items--) {
+ SV* subsv = *subrv_p++;
+ if(!hv_exists_ent(stored, subsv, 0)) {
+ av_push(retval, newSVsv(subsv));
+ hv_store_ent(stored, subsv, &PL_sv_undef, 0);
+ }
+ }
+ }
+ }
+ }
+
+ SvREADONLY_on(retval);
+ meta->mro_linear_dfs = retval;
+ return retval;
+}
+
+/*
+=for apidoc mro_get_linear_isa_c3
+
+Returns the C3 linearization of @ISA
+the given stash. The return value is a read-only AV*.
+C<level> should be 0 (it is used internally in this
+function's recursion).
+
+=cut
+*/
+
+AV*
+Perl_mro_get_linear_isa_c3(pTHX_ HV* stash, I32 level)
+{
+ AV* retval;
+ GV** gvp;
+ GV* gv;
+ AV* isa;
+ const char* stashname;
+ STRLEN stashname_len;
+ struct mro_meta* meta;
+
+ assert(stash);
+ assert(HvAUX(stash));
+
+ stashname = HvNAME_get(stash);
+ stashname_len = HvNAMELEN_get(stash);
+ if (!stashname)
+ Perl_croak(aTHX_
+ "Can't linearize anonymous symbol table");
+
+ if (level > 100)
+ Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
+ stashname);
+
+ meta = HvMROMETA(stash);
+ if((retval = meta->mro_linear_c3)) {
+ /* return cache if valid */
+ return retval;
+ }
+
+ /* not in cache, make a new one */
+
+ retval = newAV();
+ av_push(retval, newSVpvn(stashname, stashname_len)); /* us first */
+
+ gvp = (GV**)hv_fetchs(stash, "ISA", FALSE);
+ isa = (gvp && (gv = *gvp) && isGV_with_GP(gv)) ? GvAV(gv) : NULL;
+
+ if(isa && AvFILLp(isa) >= 0) {
+ SV** seqs_ptr;
+ I32 seqs_items;
+ HV* tails = (HV*)sv_2mortal((SV*)newHV());
+ AV* seqs = (AV*)sv_2mortal((SV*)newAV());
+ I32 items = AvFILLp(isa) + 1;
+ SV** isa_ptr = AvARRAY(isa);
+ while(items--) {
+ AV* isa_lin;
+ SV* isa_item = *isa_ptr++;
+ HV* isa_item_stash = gv_stashsv(isa_item, 0);
+ if(!isa_item_stash) {
+ isa_lin = newAV();
+ av_push(isa_lin, newSVsv(isa_item));
+ }
+ else {
+ isa_lin = mro_get_linear_isa_c3(isa_item_stash, level + 1); /* recursion */
+ }
+ av_push(seqs, (SV*)av_make(AvFILLp(isa_lin)+1, AvARRAY(isa_lin)));
+ }
+ av_push(seqs, (SV*)av_make(AvFILLp(isa)+1, AvARRAY(isa)));
+
+ seqs_ptr = AvARRAY(seqs);
+ seqs_items = AvFILLp(seqs) + 1;
+ while(seqs_items--) {
+ AV* seq = (AV*)*seqs_ptr++;
+ I32 seq_items = AvFILLp(seq);
+ if(seq_items > 0) {
+ SV** seq_ptr = AvARRAY(seq) + 1;
+ while(seq_items--) {
+ SV* seqitem = *seq_ptr++;
+ HE* he = hv_fetch_ent(tails, seqitem, 0, 0);
+ if(!he) {
+ hv_store_ent(tails, seqitem, newSViv(1), 0);
+ }
+ else {
+ SV* val = HeVAL(he);
+ sv_inc(val);
+ }
+ }
+ }
+ }
+
+ while(1) {
+ SV* seqhead = NULL;
+ SV* cand = NULL;
+ SV* winner = NULL;
+ SV* val;
+ HE* tail_entry;
+ AV* seq;
+ SV** avptr = AvARRAY(seqs);
+ items = AvFILLp(seqs)+1;
+ while(items--) {
+ SV** svp;
+ seq = (AV*)*avptr++;
+ if(AvFILLp(seq) < 0) continue;
+ svp = av_fetch(seq, 0, 0);
+ seqhead = *svp;
+ if(!winner) {
+ cand = seqhead;
+ if((tail_entry = hv_fetch_ent(tails, cand, 0, 0))
+ && (val = HeVAL(tail_entry))
+ && (SvIVx(val) > 0))
+ continue;
+ winner = newSVsv(cand);
+ av_push(retval, winner);
+ }
+ if(!sv_cmp(seqhead, winner)) {
+
+ /* this is basically shift(@seq) in void context */
+ SvREFCNT_dec(*AvARRAY(seq));
+ *AvARRAY(seq) = &PL_sv_undef;
+ AvARRAY(seq) = AvARRAY(seq) + 1;
+ AvMAX(seq)--;
+ AvFILLp(seq)--;
+
+ if(AvFILLp(seq) < 0) continue;
+ svp = av_fetch(seq, 0, 0);
+ seqhead = *svp;
+ tail_entry = hv_fetch_ent(tails, seqhead, 0, 0);
+ val = HeVAL(tail_entry);
+ sv_dec(val);
+ }
+ }
+ if(!cand) break;
+ if(!winner) {
+ SvREFCNT_dec(retval);
+ Perl_croak(aTHX_ "Inconsistent hierarchy during C3 merge of class '%s': "
+ "merging failed on parent '%"SVf"'", stashname, SVfARG(cand));
+ }
+ }
+ }
+
+ SvREADONLY_on(retval);
+ meta->mro_linear_c3 = retval;
+ return retval;
+}
+
+/*
+=for apidoc mro_get_linear_isa
+
+Returns either C<mro_get_linear_isa_c3> or
+C<mro_get_linear_isa_dfs> for the given stash,
+dependant upon which MRO is in effect
+for that stash. The return value is a
+read-only AV*.
+
+=cut
+*/
+AV*
+Perl_mro_get_linear_isa(pTHX_ HV *stash)
+{
+ struct mro_meta* meta;
+ assert(stash);
+ assert(HvAUX(stash));
+
+ meta = HvMROMETA(stash);
+ if(meta->mro_which == MRO_DFS) {
+ return mro_get_linear_isa_dfs(stash, 0);
+ } else if(meta->mro_which == MRO_C3) {
+ return mro_get_linear_isa_c3(stash, 0);
+ } else {
+ Perl_croak(aTHX_ "Internal error: invalid MRO!");
+ }
+}
+
+/*
+=for apidoc mro_isa_changed_in
+
+Takes the neccesary steps (cache invalidations, mostly)
+when the @ISA of the given package has changed. Invoked
+by the C<setisa> magic, should not need to invoke directly.
+
+=cut
+*/
+void
+Perl_mro_isa_changed_in(pTHX_ HV* stash)
+{
+ dVAR;
+ HV* isarev;
+ AV* linear_mro;
+ HE* iter;
+ SV** svp;
+ I32 items;
+ struct mro_meta* meta;
+ char* stashname;
+
+ stashname = HvNAME_get(stash);
+
+ /* wipe out the cached linearizations for this stash */
+ meta = HvMROMETA(stash);
+ SvREFCNT_dec((SV*)meta->mro_linear_dfs);
+ SvREFCNT_dec((SV*)meta->mro_linear_c3);
+ meta->mro_linear_dfs = NULL;
+ meta->mro_linear_c3 = NULL;
+
+ /* Wipe the global method cache if this package
+ is UNIVERSAL or one of its parents */
+ if(meta->is_universal)
+ PL_sub_generation++;
+
+ /* Wipe the local method cache otherwise */
+ else
+ meta->sub_generation++;
+
+ /* wipe next::method cache too */
+ if(meta->mro_nextmethod) hv_clear(meta->mro_nextmethod);
+
+ /* Iterate the isarev (classes that are our children),
+ wiping out their linearization and method caches */
+ if((isarev = meta->mro_isarev)) {
+ hv_iterinit(isarev);
+ while((iter = hv_iternext(isarev))) {
+ SV* revkey = hv_iterkeysv(iter);
+ HV* revstash = gv_stashsv(revkey, 0);
+ struct mro_meta* revmeta = HvMROMETA(revstash);
+ SvREFCNT_dec((SV*)revmeta->mro_linear_dfs);
+ SvREFCNT_dec((SV*)revmeta->mro_linear_c3);
+ revmeta->mro_linear_dfs = NULL;
+ revmeta->mro_linear_c3 = NULL;
+ if(!meta->is_universal)
+ revmeta->sub_generation++;
+ if(revmeta->mro_nextmethod)
+ hv_clear(revmeta->mro_nextmethod);
+ }
+ }
+
+ /* we're starting at the 2nd element, skipping ourselves here */
+ linear_mro = mro_get_linear_isa(stash);
+ svp = AvARRAY(linear_mro) + 1;
+ items = AvFILLp(linear_mro);
+ while (items--) {
+ SV* const sv = *svp++;
+ struct mro_meta* mrometa;
+ HV* mroisarev;
+
+ HV* mrostash = gv_stashsv(sv, 0);
+ if(!mrostash) {
+ mrostash = gv_stashsv(sv, GV_ADD);
+ /*
+ We created the package on the fly, so
+ that we could store isarev information.
+ This flag lets gv_fetchmeth know about it,
+ so that it can still generate the very useful
+ "Can't locate package Foo for @Bar::ISA" warning.
+ */
+ HvMROMETA(mrostash)->fake = 1;
+ }
+
+ mrometa = HvMROMETA(mrostash);
+ mroisarev = mrometa->mro_isarev;
+
+ /* is_universal is viral */
+ if(meta->is_universal)
+ mrometa->is_universal = 1;
+
+ if(!mroisarev)
+ mroisarev = mrometa->mro_isarev = newHV();
+
+ if(!hv_exists(mroisarev, stashname, strlen(stashname)))
+ hv_store(mroisarev, stashname, strlen(stashname), &PL_sv_yes, 0);
+
+ if(isarev) {
+ hv_iterinit(isarev);
+ while((iter = hv_iternext(isarev))) {
+ SV* revkey = hv_iterkeysv(iter);
+ if(!hv_exists_ent(mroisarev, revkey, 0))
+ hv_store_ent(mroisarev, revkey, &PL_sv_yes, 0);
+ }
+ }
+ }
+}
+
+/*
+=for apidoc mro_method_changed_in
+
+Like C<mro_isa_changed_in>, but invalidates method
+caching on any child classes of the given stash, so
+that they might notice the changes in this one.
+
+Ideally, all instances of C<PL_sub_generation++> in
+the perl source should be replaced by calls to this.
+Some already are, but some are more difficult to
+replace.
+
+Perl has always had problems with method caches
+getting out of sync when one directly manipulates
+stashes via things like C<%{Foo::} = %{Bar::}> or
+C<${Foo::}{bar} = ...> or the equivalent. If
+you do this in core or XS code, call this afterwards
+on the destination stash to get things back in sync.
+
+If you're doing such a thing from pure perl, use
+C<mro::method_changed_in(classname)>, which
+just calls this.
+
+=cut
+*/
+void
+Perl_mro_method_changed_in(pTHX_ HV *stash)
+{
+ struct mro_meta* meta = HvMROMETA(stash);
+ HV* isarev;
+ HE* iter;
+
+ /* If stash is UNIVERSAL, or one of UNIVERSAL's parents,
+ invalidate all method caches globally */
+ if(meta->is_universal) {
+ PL_sub_generation++;
+ return;
+ }
+
+ /* else, invalidate the method caches of all child classes,
+ but not itself */
+ if((isarev = meta->mro_isarev)) {
+ hv_iterinit(isarev);
+ while((iter = hv_iternext(isarev))) {
+ SV* revkey = hv_iterkeysv(iter);
+ HV* revstash = gv_stashsv(revkey, 0);
+ struct mro_meta* mrometa = HvMROMETA(revstash);
+ mrometa->sub_generation++;
+ if(mrometa->mro_nextmethod)
+ hv_clear(mrometa->mro_nextmethod);
+ }
+ }
+}
+
+/* These two are static helpers for next::method and friends,
+ and re-implement a bunch of the code from pp_caller() in
+ a more efficient manner for this particular usage.
+*/
+
+STATIC I32
+__dopoptosub_at(const PERL_CONTEXT *cxstk, I32 startingblock) {
+ I32 i;
+ for (i = startingblock; i >= 0; i--) {
+ if(CxTYPE((PERL_CONTEXT*)(&cxstk[i])) == CXt_SUB) return i;
+ }
+ return i;
+}
+
+STATIC SV*
+__nextcan(pTHX_ SV* self, I32 throw_nomethod)
+{
+ register I32 cxix;
+ register const PERL_CONTEXT *ccstack = cxstack;
+ const PERL_SI *top_si = PL_curstackinfo;
+ HV* selfstash;
+ GV* cvgv;
+ SV *stashname;
+ const char *fq_subname;
+ const char *subname;
+ STRLEN fq_subname_len;
+ STRLEN stashname_len;
+ STRLEN subname_len;
+ SV* sv;
+ GV** gvp;
+ AV* linear_av;
+ SV** linear_svp;
+ SV* linear_sv;
+ HV* curstash;
+ GV* candidate = NULL;
+ CV* cand_cv = NULL;
+ const char *hvname;
+ I32 items;
+ struct mro_meta* selfmeta;
+ HV* nmcache;
+ HE* cache_entry;
+
+ if(sv_isobject(self))
+ selfstash = SvSTASH(SvRV(self));
+ else
+ selfstash = gv_stashsv(self, 0);
+
+ assert(selfstash);
+
+ hvname = HvNAME_get(selfstash);
+ if (!hvname)
+ Perl_croak(aTHX_ "Can't use anonymous symbol table for method lookup");
+
+ cxix = __dopoptosub_at(cxstack, cxstack_ix);
+
+ /* This block finds the contextually-enclosing fully-qualified subname,
+ much like looking at (caller($i))[3] until you find a real sub that
+ isn't ANON, etc */
+ for (;;) {
+ /* we may be in a higher stacklevel, so dig down deeper */
+ while (cxix < 0) {
+ if(top_si->si_type == PERLSI_MAIN)
+ Perl_croak(aTHX_ "next::method/next::can/maybe::next::method must be used in method context");
+ top_si = top_si->si_prev;
+ ccstack = top_si->si_cxstack;
+ cxix = __dopoptosub_at(ccstack, top_si->si_cxix);
+ }
+
+ if(CxTYPE((PERL_CONTEXT*)(&ccstack[cxix])) != CXt_SUB
+ || (PL_DBsub && GvCV(PL_DBsub) && ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))) {
+ cxix = __dopoptosub_at(ccstack, cxix - 1);
+ continue;
+ }
+
+ {
+ const I32 dbcxix = __dopoptosub_at(ccstack, cxix - 1);
+ if (PL_DBsub && GvCV(PL_DBsub) && dbcxix >= 0 && ccstack[dbcxix].blk_sub.cv == GvCV(PL_DBsub)) {
+ if(CxTYPE((PERL_CONTEXT*)(&ccstack[dbcxix])) != CXt_SUB) {
+ cxix = dbcxix;
+ continue;
+ }
+ }
+ }
+
+ cvgv = CvGV(ccstack[cxix].blk_sub.cv);
+
+ if(!isGV(cvgv)) {
+ cxix = __dopoptosub_at(ccstack, cxix - 1);
+ continue;
+ }
+
+ /* we found a real sub here */
+ sv = sv_2mortal(newSV(0));
+
+ gv_efullname3(sv, cvgv, NULL);
+
+ fq_subname = SvPVX(sv);
+ fq_subname_len = SvCUR(sv);
+
+ subname = strrchr(fq_subname, ':');
+ if(!subname)
+ Perl_croak(aTHX_ "next::method/next::can/maybe::next::method cannot find enclosing method");
+
+ subname++;
+ subname_len = fq_subname_len - (subname - fq_subname);
+ if(subname_len == 8 && strEQ(subname, "__ANON__")) {
+ cxix = __dopoptosub_at(ccstack, cxix - 1);
+ continue;
+ }
+ break;
+ }
+
+ /* If we made it to here, we found our context */
+
+ selfmeta = HvMROMETA(selfstash);
+ if(!(nmcache = selfmeta->mro_nextmethod)) {
+ nmcache = selfmeta->mro_nextmethod = newHV();
+ }
+
+ if((cache_entry = hv_fetch_ent(nmcache, sv, 0, 0))) {
+ SV* val = HeVAL(cache_entry);
+ if(val == &PL_sv_undef) {
+ if(throw_nomethod)
+ Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname);
+ }
+ return val;
+ }
+
+ /* beyond here is just for cache misses, so perf isn't as critical */
+
+ stashname_len = subname - fq_subname - 2;
+ stashname = sv_2mortal(newSVpvn(fq_subname, stashname_len));
+
+ linear_av = mro_get_linear_isa_c3(selfstash, 0); /* has ourselves at the top of the list */
+
+ linear_svp = AvARRAY(linear_av);
+ items = AvFILLp(linear_av) + 1;
+
+ while (items--) {
+ linear_sv = *linear_svp++;
+ assert(linear_sv);
+ if(sv_eq(linear_sv, stashname))
+ break;
+ }
+
+ if(items > 0) {
+ while (items--) {
+ linear_sv = *linear_svp++;
+ assert(linear_sv);
+ curstash = gv_stashsv(linear_sv, FALSE);
+
+ if (!curstash || (HvMROMETA(curstash)->fake && !HvFILL(curstash))) {
+ if (ckWARN(WARN_MISC))
+ Perl_warner(aTHX_ packWARN(WARN_MISC), "Can't locate package %"SVf" for @%s::ISA",
+ (void*)linear_sv, hvname);
+ continue;
+ }
+
+ assert(curstash);
+
+ gvp = (GV**)hv_fetch(curstash, subname, subname_len, 0);
+ if (!gvp) continue;
+
+ candidate = *gvp;
+ assert(candidate);
+
+ if (SvTYPE(candidate) != SVt_PVGV)
+ gv_init(candidate, curstash, subname, subname_len, TRUE);
+ if (SvTYPE(candidate) == SVt_PVGV && (cand_cv = GvCV(candidate)) && !GvCVGEN(candidate)) {
+ SvREFCNT_inc_simple_void_NN((SV*)cand_cv);
+ hv_store_ent(nmcache, newSVsv(sv), (SV*)cand_cv, 0);
+ return (SV*)cand_cv;
+ }
+ }
+ }
+
+ hv_store_ent(nmcache, newSVsv(sv), &PL_sv_undef, 0);
+ if(throw_nomethod)
+ Perl_croak(aTHX_ "No next::method '%s' found for %s", subname, hvname);
+ return &PL_sv_undef;
+}
+
+#include "XSUB.h"
+
+XS(XS_mro_get_linear_isa);
+XS(XS_mro_set_mro);
+XS(XS_mro_get_mro);
+XS(XS_mro_get_isarev);
+XS(XS_mro_is_universal);
+XS(XS_mro_get_global_sub_generation);
+XS(XS_mro_invalidate_all_method_caches);
+XS(XS_mro_get_sub_generation);
+XS(XS_mro_method_changed_in);
+XS(XS_next_can);
+XS(XS_next_method);
+XS(XS_maybe_next_method);
+
+void
+Perl_boot_core_mro(pTHX)
+{
+ dVAR;
+ static const char file[] = __FILE__;
+
+ newXSproto("mro::get_linear_isa", XS_mro_get_linear_isa, file, "$;$");
+ newXSproto("mro::set_mro", XS_mro_set_mro, file, "$$");
+ newXSproto("mro::get_mro", XS_mro_get_mro, file, "$");
+ newXSproto("mro::get_isarev", XS_mro_get_isarev, file, "$");
+ newXSproto("mro::is_universal", XS_mro_is_universal, file, "$");
+ newXSproto("mro::get_global_sub_generation", XS_mro_get_global_sub_generation, file, "");
+ newXSproto("mro::invalidate_all_method_caches", XS_mro_invalidate_all_method_caches, file, "");
+ newXSproto("mro::get_sub_generation", XS_mro_get_sub_generation, file, "$");
+ newXSproto("mro::method_changed_in", XS_mro_method_changed_in, file, "$");
+ newXS("next::can", XS_next_can, file);
+ newXS("next::method", XS_next_method, file);
+ newXS("maybe::next::method", XS_maybe_next_method, file);
+}
+
+XS(XS_mro_get_linear_isa) {
+ dVAR;
+ dXSARGS;
+ AV* RETVAL;
+ HV* class_stash;
+ SV* classname;
+
+ PERL_UNUSED_ARG(cv);
+
+ if(items < 1 || items > 2)
+ Perl_croak(aTHX_ "Usage: mro::get_linear_isa(classname [, type ])");
+
+ classname = ST(0);
+ class_stash = gv_stashsv(classname, 0);
+ if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname));
+
+ if(items > 1) {
+ char* which = SvPV_nolen(ST(1));
+ if(strEQ(which, "dfs"))
+ RETVAL = mro_get_linear_isa_dfs(class_stash, 0);
+ else if(strEQ(which, "c3"))
+ RETVAL = mro_get_linear_isa_c3(class_stash, 0);
+ else
+ Perl_croak(aTHX_ "Invalid mro name: '%s'", which);
+ }
+ else {
+ RETVAL = mro_get_linear_isa(class_stash);
+ }
+
+ ST(0) = newRV_inc((SV*)RETVAL);
+ sv_2mortal(ST(0));
+ XSRETURN(1);
+}
+
+XS(XS_mro_set_mro)
+{
+ dVAR;
+ dXSARGS;
+ SV* classname;
+ char* whichstr;
+ mro_alg which;
+ HV* class_stash;
+ struct mro_meta* meta;
+
+ PERL_UNUSED_ARG(cv);
+
+ if (items != 2)
+ Perl_croak(aTHX_ "Usage: mro::set_mro(classname, type)");
+
+ classname = ST(0);
+ whichstr = SvPV_nolen(ST(1));
+ class_stash = gv_stashsv(classname, GV_ADD);
+ if(!class_stash) Perl_croak(aTHX_ "Cannot create class: '%"SVf"'!", SVfARG(classname));
+ meta = HvMROMETA(class_stash);
+
+ if(strEQ(whichstr, "dfs"))
+ which = MRO_DFS;
+ else if(strEQ(whichstr, "c3"))
+ which = MRO_C3;
+ else
+ Perl_croak(aTHX_ "Invalid mro name: '%s'", whichstr);
+
+ if(meta->mro_which != which) {
+ meta->mro_which = which;
+ /* Only affects local method cache, not
+ even child classes */
+ meta->sub_generation++;
+ if(meta->mro_nextmethod)
+ hv_clear(meta->mro_nextmethod);
+ }
+
+ XSRETURN_EMPTY;
+}
+
+
+XS(XS_mro_get_mro)
+{
+ dVAR;
+ dXSARGS;
+ SV* classname;
+ HV* class_stash;
+ struct mro_meta* meta;
+
+ PERL_UNUSED_ARG(cv);
+
+ if (items != 1)
+ Perl_croak(aTHX_ "Usage: mro::get_mro(classname)");
+
+ classname = ST(0);
+ class_stash = gv_stashsv(classname, 0);
+ if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname));
+ meta = HvMROMETA(class_stash);
+
+ if(meta->mro_which == MRO_DFS)
+ ST(0) = sv_2mortal(newSVpvn("dfs", 3));
+ else
+ ST(0) = sv_2mortal(newSVpvn("c3", 2));
+
+ XSRETURN(1);
+}
+
+XS(XS_mro_get_isarev)
+{
+ dVAR;
+ dXSARGS;
+ SV* classname;
+ HV* class_stash;
+ HV* isarev;
+
+ PERL_UNUSED_ARG(cv);
+
+ if (items != 1)
+ Perl_croak(aTHX_ "Usage: mro::get_isarev(classname)");
+
+ classname = ST(0);
+
+ class_stash = gv_stashsv(classname, 0);
+ if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname));
+
+ SP -= items;
+
+ if((isarev = HvMROMETA(class_stash)->mro_isarev)) {
+ HE* iter;
+ hv_iterinit(isarev);
+ while((iter = hv_iternext(isarev)))
+ XPUSHs(hv_iterkeysv(iter));
+ }
+
+ PUTBACK;
+ return;
+}
+
+XS(XS_mro_is_universal)
+{
+ dVAR;
+ dXSARGS;
+ SV* classname;
+ HV* class_stash;
+
+ PERL_UNUSED_ARG(cv);
+
+ if (items != 1)
+ Perl_croak(aTHX_ "Usage: mro::get_mro(classname)");
+
+ classname = ST(0);
+ class_stash = gv_stashsv(classname, 0);
+ if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname));
+
+ HvMROMETA(class_stash)->is_universal
+ ? XSRETURN_YES
+ : XSRETURN_NO;
+}
+
+XS(XS_mro_get_global_sub_generation)
+{
+ dVAR;
+ dXSARGS;
+
+ PERL_UNUSED_ARG(cv);
+
+ if (items != 0)
+ Perl_croak(aTHX_ "Usage: mro::get_global_sub_generation()");
+
+ ST(0) = sv_2mortal(newSViv(PL_sub_generation));
+ XSRETURN(1);
+}
+
+XS(XS_mro_invalidate_all_method_caches)
+{
+ dVAR;
+ dXSARGS;
+
+ PERL_UNUSED_ARG(cv);
+
+ if (items != 0)
+ Perl_croak(aTHX_ "Usage: mro::invalidate_all_method_caches()");
+
+ PL_sub_generation++;
+
+ XSRETURN_EMPTY;
+}
+
+XS(XS_mro_get_sub_generation)
+{
+ dVAR;
+ dXSARGS;
+ SV* classname;
+ HV* class_stash;
+
+ PERL_UNUSED_ARG(cv);
+
+ if(items != 1)
+ Perl_croak(aTHX_ "Usage: mro::get_sub_generation(classname)");
+
+ classname = ST(0);
+ class_stash = gv_stashsv(classname, 0);
+ if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname));
+
+ ST(0) = sv_2mortal(newSViv(HvMROMETA(class_stash)->sub_generation));
+ XSRETURN(1);
+}
+
+XS(XS_mro_method_changed_in)
+{
+ dVAR;
+ dXSARGS;
+ SV* classname;
+ HV* class_stash;
+
+ PERL_UNUSED_ARG(cv);
+
+ if(items != 1)
+ Perl_croak(aTHX_ "Usage: mro::method_changed_in(classname)");
+
+ classname = ST(0);
+
+ class_stash = gv_stashsv(classname, 0);
+ if(!class_stash) Perl_croak(aTHX_ "No such class: '%"SVf"'!", SVfARG(classname));
+
+ mro_method_changed_in(class_stash);
+
+ XSRETURN_EMPTY;
+}
+
+XS(XS_next_can)
+{
+ dVAR;
+ dXSARGS;
+ SV* self = ST(0);
+ SV* methcv = __nextcan(aTHX_ self, 0);
+
+ PERL_UNUSED_ARG(cv);
+ PERL_UNUSED_VAR(items);
+
+ if(methcv == &PL_sv_undef) {
+ ST(0) = &PL_sv_undef;
+ }
+ else {
+ ST(0) = sv_2mortal(newRV_inc(methcv));
+ }
+
+ XSRETURN(1);
+}
+
+XS(XS_next_method)
+{
+ dMARK;
+ dAX;
+ SV* self = ST(0);
+ SV* methcv = __nextcan(aTHX_ self, 1);
+
+ PERL_UNUSED_ARG(cv);
+
+ PL_markstack_ptr++;
+ call_sv(methcv, GIMME_V);
+}
+
+XS(XS_maybe_next_method)
+{
+ dMARK;
+ dAX;
+ SV* self = ST(0);
+ SV* methcv = __nextcan(aTHX_ self, 0);
+
+ PERL_UNUSED_ARG(cv);
+
+ if(methcv == &PL_sv_undef) {
+ ST(0) = &PL_sv_undef;
+ XSRETURN(1);
+ }
+
+ PL_markstack_ptr++;
+ call_sv(methcv, GIMME_V);
+}
+
+/*
+ * Local variables:
+ * c-indentation-style: bsd
+ * c-basic-offset: 4
+ * indent-tabs-mode: t
+ * End:
+ *
+ * ex: set ts=8 sts=4 sw=4 noet:
+ */
https://perl5.git.perl.org / perl5.git / commitdiff