#include "perl.h"
#include "XSUB.h"
+#define __PACKAGE__ "Scope::Upper"
+
#ifndef SU_DEBUG
# define SU_DEBUG 0
#endif
# define PERL_MAGIC_env 'E'
#endif
+#ifndef NEGATIVE_INDICES_VAR
+# define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
+#endif
+
#define SU_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
/* --- Stack manipulations ------------------------------------------------- */
/* ... Saving array elements ............................................... */
-STATIC I32 su_av_preeminent(pTHX_ AV *av, I32 key) {
-#define su_av_preeminent(A, K) su_av_preeminent(aTHX_ (A), (K))
- MAGIC *mg;
- HV *stash;
+STATIC I32 su_av_key2idx(pTHX_ AV *av, I32 key) {
+#define su_av_key2idx(A, K) su_av_key2idx(aTHX_ (A), (K))
+ I32 idx;
+
+ if (key >= 0)
+ return key;
+
+/* Added by MJD in perl-5.8.1 with 6f12eb6d2a1dfaf441504d869b27d2e40ef4966a */
+#if SU_HAS_PERL(5, 8, 1)
+ if (SvRMAGICAL(av)) {
+ const MAGIC * const tied_magic = mg_find((SV *) av, PERL_MAGIC_tied);
+ if (tied_magic) {
+ int adjust_index = 1;
+ SV * const * const negative_indices_glob =
+ hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *) (av), tied_magic))),
+ NEGATIVE_INDICES_VAR, 16, 0);
+ if (negative_indices_glob && SvTRUE(GvSV(*negative_indices_glob)))
+ return key;
+ }
+ }
+#endif
- if (!av) return 0;
- if (SvCANEXISTDELETE(av))
- return av_exists(av, key);
+ idx = key + av_len(av) + 1;
+ if (idx < 0)
+ return key;
- return 1;
+ return idx;
}
#ifndef SAVEADELETE
typedef struct {
AV *av;
- I32 key;
+ I32 idx;
} su_ud_adelete;
STATIC void su_adelete(pTHX_ void *ud_) {
su_ud_adelete *ud = ud_;
- av_delete(ud->av, ud->key, G_DISCARD);
+ av_delete(ud->av, ud->idx, G_DISCARD);
SvREFCNT_dec(ud->av);
Safefree(ud);
}
-STATIC void su_save_adelete(pTHX_ AV *av, I32 key) {
+STATIC void su_save_adelete(pTHX_ AV *av, I32 idx) {
#define su_save_adelete(A, K) su_save_adelete(aTHX_ (A), (K))
su_ud_adelete *ud;
Newx(ud, 1, su_ud_adelete);
ud->av = av;
- ud->key = key;
+ ud->idx = idx;
SvREFCNT_inc(av);
SAVEDESTRUCTOR_X(su_adelete, ud);
#endif /* SAVEADELETE */
-STATIC void su_save_aelem(pTHX_ AV *av, I32 key, SV **svp, I32 preeminent) {
-#define su_save_aelem(A, K, S, P) su_save_aelem(aTHX_ (A), (K), (S), (P))
+STATIC void su_save_aelem(pTHX_ AV *av, SV *key, SV *val) {
+#define su_save_aelem(A, K, V) su_save_aelem(aTHX_ (A), (K), (V))
+ I32 idx;
+ I32 preeminent = 1;
+ SV **svp;
+ HV *stash;
+ MAGIC *mg;
+
+ idx = su_av_key2idx(av, SvIV(key));
+
+ if (SvCANEXISTDELETE(av))
+ preeminent = av_exists(av, idx);
+
+ svp = av_fetch(av, idx, 1);
+ if (!svp || *svp == &PL_sv_undef) croak(PL_no_aelem, idx);
+
if (preeminent)
- save_aelem(av, key, svp);
+ save_aelem(av, idx, svp);
else
- SAVEADELETE(av, key);
+ SAVEADELETE(av, idx);
+
+ if (val) { /* local $x[$idx] = $val; */
+ SvSetMagicSV(*svp, val);
+ } else { /* local $x[$idx]; delete $x[$idx]; */
+ av_delete(av, idx, G_DISCARD);
+ }
}
/* ... Saving hash elements ................................................ */
-STATIC I32 su_hv_preeminent(pTHX_ HV *hv, SV *keysv) {
-#define su_hv_preeminent(H, K) su_hv_preeminent(aTHX_ (H), (K))
- MAGIC *mg;
+STATIC void su_save_helem(pTHX_ HV *hv, SV *keysv, SV *val) {
+#define su_save_helem(H, K, V) su_save_helem(aTHX_ (H), (K), (V))
+ I32 preeminent = 1;
+ HE *he;
+ SV **svp;
HV *stash;
+ MAGIC *mg;
- if (!hv) return 0;
if (SvCANEXISTDELETE(hv) || mg_find((SV *) hv, PERL_MAGIC_env))
- return hv_exists_ent(hv, keysv, 0);
+ preeminent = hv_exists_ent(hv, keysv, 0);
- return 1;
-}
+ he = hv_fetch_ent(hv, keysv, 1, 0);
+ svp = he ? &HeVAL(he) : NULL;
+ if (!svp || *svp == &PL_sv_undef) croak("Modification of non-creatable hash value attempted, subscript \"%s\"", SvPV_nolen_const(*svp));
-STATIC void su_save_helem(pTHX_ HV *hv, SV *keysv, SV **svp, I32 preeminent) {
-#define su_save_helem(H, K, S, P) su_save_helem(aTHX_ (H), (K), (S), (P))
if (HvNAME_get(hv) && isGV(*svp)) {
save_gp((GV *) *svp, 0);
return;
}
+
if (preeminent)
save_helem(hv, keysv, svp);
else {
SAVEDELETE(hv, savepvn(key, keylen),
SvUTF8(keysv) ? -(I32)keylen : (I32)keylen);
}
+
+ if (val) { /* local $x{$keysv} = $val; */
+ SvSetMagicSV(*svp, val);
+ } else { /* local $x{$keysv}; delete $x{$keysv}; */
+ hv_delete_ent(hv, keysv, G_DISCARD, HeHASH(he));
+ }
}
/* --- Actions ------------------------------------------------------------- */
if (SvTYPE(sv) >= SVt_PVGV) {
gv = (GV *) sv;
- if (!SvROK(val))
+ if (!val) { /* local *x; */
+ t = SVt_PVGV;
+ } else if (!SvROK(val)) { /* local *x = $val; */
goto assign;
- t = SvTYPE(SvRV(val));
- deref = 1;
+ } else { /* local *x = \$val; */
+ t = SvTYPE(SvRV(val));
+ deref = 1;
+ }
} else {
STRLEN len, l;
const char *p = SvPV_const(sv, len), *s;
case '&': t = SVt_PVCV; break;
case '*': t = SVt_PVGV; break;
}
- if (t == SVt_NULL) {
+ if (t != SVt_NULL) {
+ ++s;
+ --l;
+ } else if (val) { /* t == SVt_NULL, type can't be inferred from the sigil */
if (SvROK(val) && !sv_isobject(val)) {
t = SvTYPE(SvRV(val));
deref = 1;
} else {
t = SvTYPE(val);
}
- } else {
- ++s;
- --l;
}
gv = gv_fetchpvn_flags(s, l, GV_ADDMULTI, SVt_PVGV);
}
switch (t) {
case SVt_PVAV:
if (elem) {
- I32 idx = SvIV(elem);
- AV *av = GvAV(gv);
- I32 preeminent = su_av_preeminent(av, idx);
- SV **svp = av_fetch(av, idx, 1);
- if (!*svp || *svp == &PL_sv_undef) croak(PL_no_aelem, idx);
- su_save_aelem(av, idx, svp, preeminent);
- gv = (GV *) *svp;
- goto maybe_deref;
+ su_save_aelem(GvAV(gv), elem, val);
+ goto done;
} else
save_ary(gv);
break;
case SVt_PVHV:
if (elem) {
- HV *hv = GvHV(gv);
- I32 preeminent = su_hv_preeminent(hv, elem);
- HE *he = hv_fetch_ent(hv, elem, 1, 0);
- SV **svp = he ? &HeVAL(he) : NULL;
- if (!svp || *svp == &PL_sv_undef) croak("Modification of non-creatable hash value attempted, subscript \"%s\"", SvPV_nolen_const(*svp));
- su_save_helem(hv, elem, svp, preeminent);
- gv = (GV *) *svp;
- goto maybe_deref;
+ su_save_helem(GvHV(gv), elem, val);
+ goto done;
} else
save_hash(gv);
break;
default:
gv = (GV *) save_scalar(gv);
maybe_deref:
- if (deref)
+ if (deref) /* val != NULL */
val = SvRV(val);
break;
}
PL_scopestack[PL_scopestack_ix]));
assign:
- SvSetMagicSV((SV *) gv, val);
+ if (val)
+ SvSetMagicSV((SV *) gv, val);
+done:
SvREFCNT_dec(ud->elem);
SvREFCNT_dec(ud->val);
SvREFCNT_dec(ud->sv);
if (level > cxstack_ix) \
level = cxstack_ix;
+#define SU_DOPOPTOCX(t) \
+ STMT_START { \
+ I32 i, cxix = cxstack_ix, from = 0; \
+ if (items) \
+ from = SvIV(ST(0)); \
+ for (i = cxix - from; i >= 0; --i) { \
+ if (CxTYPE(&cxstack[i]) == t) { \
+ ST(0) = sv_2mortal(newSViv(cxix - i)); \
+ XSRETURN(1); \
+ } \
+ } \
+ XSRETURN_UNDEF; \
+ } STMT_END
+
/* --- XS ------------------------------------------------------------------ */
MODULE = Scope::Upper PACKAGE = Scope::Upper
PROTOTYPES: ENABLE
+BOOT:
+{
+ HV *stash = gv_stashpv(__PACKAGE__, 1);
+ newCONSTSUB(stash, "CURRENT", newSViv(0));
+}
+
SV *
-TOPLEVEL()
+TOP()
PROTOTYPE:
CODE:
RETVAL = newSViv(cxstack_ix);
OUTPUT:
RETVAL
+SV *
+UP(...)
+PROTOTYPE: ;$
+PREINIT:
+ I32 i = 0;
+ I32 cxix = cxstack_ix;
+CODE:
+ if (items)
+ i = SvIV(ST(0));
+ if (++i > cxix)
+ i = cxix;
+ RETVAL = newSViv(i);
+OUTPUT:
+ RETVAL
+
+SV *
+DOWN(...)
+PROTOTYPE: ;$
+PREINIT:
+ I32 i = 0;
+CODE:
+ if (items)
+ i = SvIV(ST(0));
+ if (--i < 0)
+ i = 0;
+ RETVAL = newSViv(i);
+OUTPUT:
+ RETVAL
+
+void
+SUB(...)
+PROTOTYPE: ;$
+PPCODE:
+ SU_DOPOPTOCX(CXt_SUB);
+
+void
+EVAL(...)
+PROTOTYPE: ;$
+PPCODE:
+ SU_DOPOPTOCX(CXt_EVAL);
+
void
reap(SV *hook, ...)
PROTOTYPE: &;$
SvREFCNT_inc(elem);
ud->elem = elem;
su_init(level, ud, 4);
+
+void
+localize_delete(SV *sv, SV *elem, ...)
+PROTOTYPE: $$;$
+PREINIT:
+ I32 level = 0;
+ su_ud_localize *ud;
+CODE:
+ SU_GET_LEVEL(2);
+ Newx(ud, 1, su_ud_localize);
+ SU_UD_ORIGIN(ud) = NULL;
+ SU_UD_HANDLER(ud) = su_localize;
+ SvREFCNT_inc(sv);
+ ud->sv = sv;
+ ud->val = NULL;
+ SvREFCNT_inc(elem);
+ ud->elem = elem;
+ su_init(level, ud, 4);
projects / perl / modules / Scope-Upper.git / blobdiff