/* --- Compatibility wrappers ---------------------------------------------- */
+#ifndef HvNAME_get
+# define HvNAME_get(H) HvNAME(H)
+#endif
+
+#ifndef HvNAMELEN_get
+# define HvNAMELEN_get(H) strlen(HvNAME_get(H))
+#endif
+
#define A_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
+#undef ENTERn
+#if defined(ENTER_with_name) && !A_HAS_PERL(5, 11, 4)
+# define ENTERn(N) ENTER_with_name(N)
+#else
+# define ENTERn(N) ENTER
+#endif
+
+#undef LEAVEn
+#if defined(LEAVE_with_name) && !A_HAS_PERL(5, 11, 4)
+# define LEAVEn(N) LEAVE_with_name(N)
+#else
+# define LEAVEn(N) LEAVE
+#endif
+
#ifndef A_WORKAROUND_REQUIRE_PROPAGATION
# define A_WORKAROUND_REQUIRE_PROPAGATION !A_HAS_PERL(5, 10, 1)
#endif
+/* ... Thread safety and multiplicity ...................................... */
+
+#ifndef A_MULTIPLICITY
+# if defined(MULTIPLICITY) || defined(PERL_IMPLICIT_CONTEXT)
+# define A_MULTIPLICITY 1
+# else
+# define A_MULTIPLICITY 0
+# endif
+#endif
+#if A_MULTIPLICITY && !defined(tTHX)
+# define tTHX PerlInterpreter*
+#endif
+
+#if A_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))
+# define A_THREADSAFE 1
+# ifndef MY_CXT_CLONE
+# define MY_CXT_CLONE \
+ dMY_CXT_SV; \
+ my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1)); \
+ Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t); \
+ sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))
+# endif
+#else
+# define A_THREADSAFE 0
+# undef dMY_CXT
+# define dMY_CXT dNOOP
+# undef MY_CXT
+# define MY_CXT a_globaldata
+# undef START_MY_CXT
+# define START_MY_CXT STATIC my_cxt_t MY_CXT;
+# undef MY_CXT_INIT
+# define MY_CXT_INIT NOOP
+# undef MY_CXT_CLONE
+# define MY_CXT_CLONE NOOP
+#endif
+
/* --- Helpers ------------------------------------------------------------- */
+/* ... Thread-safe hints ................................................... */
+
#if A_WORKAROUND_REQUIRE_PROPAGATION
-#define A_ENCODE_UV(B, U) \
- len = 0; \
- while (len < sizeof(UV)) { \
- (B)[len++] = (U) & 0xFF; \
- (U) >>= 8; \
+typedef struct {
+ U32 bits;
+ IV require_tag;
+} a_hint_t;
+
+#define A_HINT_BITS(H) ((H)->bits)
+
+#define A_HINT_FREE(H) PerlMemShared_free(H)
+
+#if A_THREADSAFE
+
+#define PTABLE_NAME ptable_hints
+#define PTABLE_VAL_FREE(V) A_HINT_FREE(V)
+
+#define pPTBL pTHX
+#define pPTBL_ pTHX_
+#define aPTBL aTHX
+#define aPTBL_ aTHX_
+
+#include "ptable.h"
+
+#define ptable_hints_store(T, K, V) ptable_hints_store(aTHX_ (T), (K), (V))
+#define ptable_hints_free(T) ptable_hints_free(aTHX_ (T))
+
+#define MY_CXT_KEY __PACKAGE__ "::_guts" XS_VERSION
+
+typedef struct {
+ ptable *tbl; /* It really is a ptable_hints */
+ tTHX owner;
+} my_cxt_t;
+
+START_MY_CXT
+
+STATIC SV *a_clone(pTHX_ SV *sv, tTHX owner) {
+#define a_clone(S, O) a_clone(aTHX_ (S), (O))
+ CLONE_PARAMS param;
+ AV *stashes = NULL;
+ SV *dupsv;
+
+ if (SvTYPE(sv) == SVt_PVHV && HvNAME_get(sv))
+ stashes = newAV();
+
+ param.stashes = stashes;
+ param.flags = 0;
+ param.proto_perl = owner;
+
+ dupsv = sv_dup(sv, ¶m);
+
+ if (stashes) {
+ av_undef(stashes);
+ SvREFCNT_dec(stashes);
}
-#define A_DECODE_UV(U, B) \
- len = sizeof(UV); \
- while (len > 0) \
- (U) = ((U) << 8) | (B)[--len];
+ return SvREFCNT_inc(dupsv);
+}
-#if A_WORKAROUND_REQUIRE_PROPAGATION
-STATIC UV a_require_tag(pTHX) {
-#define a_require_tag() a_require_tag(aTHX)
- const PERL_SI *si;
+STATIC void a_ptable_clone(pTHX_ ptable_ent *ent, void *ud_) {
+ my_cxt_t *ud = ud_;
+ a_hint_t *h1 = ent->val;
+ a_hint_t *h2;
+
+ if (ud->owner == aTHX)
+ return;
+
+ h2 = PerlMemShared_malloc(sizeof *h2);
+ h2->require_tag = PTR2IV(a_clone(INT2PTR(SV *, h1->require_tag), ud->owner));
+
+ ptable_hints_store(ud->tbl, ent->key, h2);
+}
- for (si = PL_curstackinfo; si; si = si->si_prev) {
- I32 cxix;
+STATIC void a_thread_cleanup(pTHX_ void *);
+
+STATIC void a_thread_cleanup(pTHX_ void *ud) {
+ int *level = ud;
+
+ if (*level) {
+ *level = 0;
+ LEAVE;
+ SAVEDESTRUCTOR_X(a_thread_cleanup, level);
+ ENTER;
+ } else {
+ dMY_CXT;
+ PerlMemShared_free(level);
+ ptable_hints_free(MY_CXT.tbl);
+ }
+}
- for (cxix = si->si_cxix; cxix >= 0; --cxix) {
- const PERL_CONTEXT *cx = si->si_cxstack + cxix;
+#endif /* A_THREADSAFE */
- if (CxTYPE(cx) == CXt_EVAL && cx->blk_eval.old_op_type == OP_REQUIRE)
- return PTR2UV(cx);
+STATIC IV a_require_tag(pTHX) {
+#define a_require_tag() a_require_tag(aTHX)
+ const CV *cv, *outside;
+
+ cv = PL_compcv;
+
+ if (!cv) {
+ /* If for some reason the pragma is operational at run-time, try to discover
+ * the current cv in use. */
+ const PERL_SI *si;
+
+ for (si = PL_curstackinfo; si; si = si->si_prev) {
+ I32 cxix;
+
+ for (cxix = si->si_cxix; cxix >= 0; --cxix) {
+ const PERL_CONTEXT *cx = si->si_cxstack + cxix;
+
+ switch (CxTYPE(cx)) {
+ case CXt_SUB:
+ case CXt_FORMAT:
+ /* The propagation workaround is only needed up to 5.10.0 and at that
+ * time format and sub contexts were still identical. And even later the
+ * cv members offsets should have been kept the same. */
+ cv = cx->blk_sub.cv;
+ goto get_enclosing_cv;
+ case CXt_EVAL:
+ cv = cx->blk_eval.cv;
+ goto get_enclosing_cv;
+ default:
+ break;
+ }
+ }
}
+
+ cv = PL_main_cv;
}
- return PTR2UV(NULL);
+get_enclosing_cv:
+ for (outside = CvOUTSIDE(cv); outside; outside = CvOUTSIDE(cv))
+ cv = outside;
+
+ return PTR2IV(cv);
}
-#endif /* A_WORKAROUND_REQUIRE_PROPAGATION */
STATIC SV *a_tag(pTHX_ UV bits) {
#define a_tag(B) a_tag(aTHX_ (B))
- SV *hint;
- const PERL_SI *si;
- UV cxreq;
- unsigned char buf[sizeof(UV) * 2];
- STRLEN len;
+ a_hint_t *h;
+ dMY_CXT;
+
+ h = PerlMemShared_malloc(sizeof *h);
+ h->bits = bits;
+ h->require_tag = a_require_tag();
- cxreq = a_require_tag();
- A_ENCODE_UV(buf, cxreq);
- A_ENCODE_UV(buf + sizeof(UV), bits);
- hint = newSVpvn(buf, sizeof buf);
- SvREADONLY_on(hint);
+#if A_THREADSAFE
+ /* We only need for the key to be an unique tag for looking up the value later.
+ * Allocated memory provides convenient unique identifiers, so that's why we
+ * use the hint as the key itself. */
+ ptable_hints_store(MY_CXT.tbl, h, h);
+#endif /* A_THREADSAFE */
- return hint;
+ return newSViv(PTR2IV(h));
}
STATIC UV a_detag(pTHX_ const SV *hint) {
#define a_detag(H) a_detag(aTHX_ (H))
- const PERL_SI *si;
- UV cxreq = 0, bits = 0;
- unsigned char *buf;
- STRLEN len;
+ a_hint_t *h;
+ dMY_CXT;
- if (!(hint && SvOK(hint)))
+ if (!(hint && SvIOK(hint)))
return 0;
- buf = SvPVX(hint);
+ h = INT2PTR(a_hint_t *, SvIVX(hint));
+#if A_THREADSAFE
+ h = ptable_fetch(MY_CXT.tbl, h);
+#endif /* A_THREADSAFE */
- A_DECODE_UV(cxreq, buf);
- if (a_require_tag() != cxreq)
+ if (a_require_tag() != h->require_tag)
return 0;
- A_DECODE_UV(bits, buf + sizeof(UV));
-
- return bits;
+ return A_HINT_BITS(h);
}
#else /* A_WORKAROUND_REQUIRE_PROPAGATION */
{
if (!a_initialized++) {
HV *stash;
+#if A_THREADSAFE && A_WORKAROUND_REQUIRE_PROPAGATION
+ MY_CXT_INIT;
+ MY_CXT.tbl = ptable_new();
+ MY_CXT.owner = aTHX;
+#endif
a_op_map = ptable_new();
#ifdef USE_ITHREADS
}
}
+#if A_THREADSAFE && A_WORKAROUND_REQUIRE_PROPAGATION
+
+void
+CLONE(...)
+PROTOTYPE: DISABLE
+PREINIT:
+ ptable *t;
+ int *level;
+CODE:
+ {
+ my_cxt_t ud;
+ dMY_CXT;
+ ud.tbl = t = ptable_new();
+ ud.owner = MY_CXT.owner;
+ ptable_walk(MY_CXT.tbl, a_ptable_clone, &ud);
+ }
+ {
+ MY_CXT_CLONE;
+ MY_CXT.tbl = t;
+ MY_CXT.owner = aTHX;
+ }
+ {
+ level = PerlMemShared_malloc(sizeof *level);
+ *level = 1;
+ LEAVEn("sub");
+ SAVEDESTRUCTOR_X(a_thread_cleanup, level);
+ ENTERn("sub");
+ }
+
+#endif
+
SV *
_tag(SV *hint)
PROTOTYPE: $
projects / perl / modules / autovivification.git / commitdiff