/* hv.c
*
- * Copyright (c) 1991-1994, Larry Wall
+ * Copyright (c) 1991-2002, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
* "I sit beside the fire and think of all that I have seen." --Bilbo
*/
+/*
+=head1 Hash Manipulation Functions
+*/
+
#include "EXTERN.h"
+#define PERL_IN_HV_C
#include "perl.h"
-static void hsplit _((HV *hv));
-static void hfreeentries _((HV *hv));
+STATIC HE*
+S_new_he(pTHX)
+{
+ HE* he;
+ LOCK_SV_MUTEX;
+ if (!PL_he_root)
+ more_he();
+ he = PL_he_root;
+ PL_he_root = HeNEXT(he);
+ UNLOCK_SV_MUTEX;
+ return he;
+}
+
+STATIC void
+S_del_he(pTHX_ HE *p)
+{
+ LOCK_SV_MUTEX;
+ HeNEXT(p) = (HE*)PL_he_root;
+ PL_he_root = p;
+ UNLOCK_SV_MUTEX;
+}
+
+STATIC void
+S_more_he(pTHX)
+{
+ register HE* he;
+ register HE* heend;
+ XPV *ptr;
+ New(54, ptr, 1008/sizeof(XPV), XPV);
+ ptr->xpv_pv = (char*)PL_he_arenaroot;
+ PL_he_arenaroot = ptr;
+
+ he = (HE*)ptr;
+ heend = &he[1008 / sizeof(HE) - 1];
+ PL_he_root = ++he;
+ while (he < heend) {
+ HeNEXT(he) = (HE*)(he + 1);
+ he++;
+ }
+ HeNEXT(he) = 0;
+}
+
+#ifdef PURIFY
+
+#define new_HE() (HE*)safemalloc(sizeof(HE))
+#define del_HE(p) safefree((char*)p)
+
+#else
+
+#define new_HE() new_he()
+#define del_HE(p) del_he(p)
+
+#endif
+
+STATIC HEK *
+S_save_hek_flags(pTHX_ const char *str, I32 len, U32 hash, int flags)
+{
+ char *k;
+ register HEK *hek;
+
+ New(54, k, HEK_BASESIZE + len + 2, char);
+ hek = (HEK*)k;
+ Copy(str, HEK_KEY(hek), len, char);
+ HEK_KEY(hek)[len] = 0;
+ HEK_LEN(hek) = len;
+ HEK_HASH(hek) = hash;
+ HEK_FLAGS(hek) = (unsigned char)flags;
+ return hek;
+}
+
+#if defined(USE_ITHREADS)
+HE *
+Perl_he_dup(pTHX_ HE *e, bool shared, CLONE_PARAMS* param)
+{
+ HE *ret;
+
+ if (!e)
+ return Nullhe;
+ /* look for it in the table first */
+ ret = (HE*)ptr_table_fetch(PL_ptr_table, e);
+ if (ret)
+ return ret;
+
+ /* create anew and remember what it is */
+ ret = new_HE();
+ ptr_table_store(PL_ptr_table, e, ret);
+
+ HeNEXT(ret) = he_dup(HeNEXT(e),shared, param);
+ if (HeKLEN(e) == HEf_SVKEY)
+ HeKEY_sv(ret) = SvREFCNT_inc(sv_dup(HeKEY_sv(e), param));
+ else if (shared)
+ HeKEY_hek(ret) = share_hek_flags(HeKEY(e), HeKLEN(e), HeHASH(e),
+ HeKFLAGS(e));
+ else
+ HeKEY_hek(ret) = save_hek_flags(HeKEY(e), HeKLEN(e), HeHASH(e),
+ HeKFLAGS(e));
+ HeVAL(ret) = SvREFCNT_inc(sv_dup(HeVAL(e), param));
+ return ret;
+}
+#endif /* USE_ITHREADS */
+
+static void
+S_hv_notallowed(pTHX_ int flags, const char *key, I32 klen,
+ const char *msg)
+{
+ SV *sv = sv_newmortal(), *esv = sv_newmortal();
+ if (!(flags & HVhek_FREEKEY)) {
+ sv_setpvn(sv, key, klen);
+ }
+ else {
+ /* Need to free saved eventually assign to mortal SV */
+ SV *sv = sv_newmortal();
+ sv_usepvn(sv, (char *) key, klen);
+ }
+ if (flags & HVhek_UTF8) {
+ SvUTF8_on(sv);
+ }
+ Perl_sv_setpvf(aTHX_ esv, "Attempt to %s a restricted hash", msg);
+ Perl_croak(aTHX_ SvPVX(esv), sv);
+}
+
+/* (klen == HEf_SVKEY) is special for MAGICAL hv entries, meaning key slot
+ * contains an SV* */
+
+/*
+=for apidoc hv_fetch
+
+Returns the SV which corresponds to the specified key in the hash. The
+C<klen> is the length of the key. If C<lval> is set then the fetch will be
+part of a store. Check that the return value is non-null before
+dereferencing it to an C<SV*>.
+
+See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
+information on how to use this function on tied hashes.
+
+=cut
+*/
+
SV**
-hv_fetch(hv,key,klen,lval)
-HV *hv;
-char *key;
-U32 klen;
-I32 lval;
+Perl_hv_fetch(pTHX_ HV *hv, const char *key, I32 klen, I32 lval)
+{
+ bool is_utf8 = FALSE;
+ const char *keysave = key;
+ int flags = 0;
+
+ if (klen < 0) {
+ klen = -klen;
+ is_utf8 = TRUE;
+ }
+
+ if (is_utf8) {
+ STRLEN tmplen = klen;
+ /* Just casting the &klen to (STRLEN) won't work well
+ * if STRLEN and I32 are of different widths. --jhi */
+ key = (char*)bytes_from_utf8((U8*)key, &tmplen, &is_utf8);
+ klen = tmplen;
+ /* If we were able to downgrade here, then than means that we were
+ passed in a key which only had chars 0-255, but was utf8 encoded. */
+ if (is_utf8)
+ flags = HVhek_UTF8;
+ /* If we found we were able to downgrade the string to bytes, then
+ we should flag that it needs upgrading on keys or each. */
+ if (key != keysave)
+ flags |= HVhek_WASUTF8 | HVhek_FREEKEY;
+ }
+
+ return hv_fetch_flags (hv, key, klen, lval, flags);
+}
+
+STATIC SV**
+S_hv_fetch_flags(pTHX_ HV *hv, const char *key, I32 klen, I32 lval, int flags)
{
register XPVHV* xhv;
- register char *s;
- register I32 i;
- register I32 hash;
+ register U32 hash;
register HE *entry;
SV *sv;
return 0;
if (SvRMAGICAL(hv)) {
- if (mg_find((SV*)hv,'P')) {
+ /* All this clause seems to be utf8 unaware.
+ By moving the utf8 stuff out to hv_fetch_flags I need to ensure
+ key doesn't leak. I've not tried solving the utf8-ness.
+ NWC.
+ */
+ if (mg_find((SV*)hv, PERL_MAGIC_tied) || SvGMAGICAL((SV*)hv)) {
sv = sv_newmortal();
mg_copy((SV*)hv, sv, key, klen);
- Sv = sv;
- return &Sv;
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ PL_hv_fetch_sv = sv;
+ return &PL_hv_fetch_sv;
}
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ I32 i;
+ for (i = 0; i < klen; ++i)
+ if (isLOWER(key[i])) {
+ char *nkey = strupr(SvPVX(sv_2mortal(newSVpvn(key,klen))));
+ SV **ret = hv_fetch(hv, nkey, klen, 0);
+ if (!ret && lval) {
+ ret = hv_store_flags(hv, key, klen, NEWSV(61,0), 0,
+ flags);
+ } else if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ return ret;
+ }
+ }
+#endif
}
+ /* We use xhv->xhv_foo fields directly instead of HvFOO(hv) to
+ avoid unnecessary pointer dereferencing. */
xhv = (XPVHV*)SvANY(hv);
- if (!xhv->xhv_array) {
- if (lval
+ if (!xhv->xhv_array /* !HvARRAY(hv) */) {
+ if (lval
#ifdef DYNAMIC_ENV_FETCH /* if it's an %ENV lookup, we may get it on the fly */
- || (HvNAME(hv) && strEQ(HvNAME(hv),ENV_HV_NAME))
+ || (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env))
#endif
- )
- Newz(503,xhv->xhv_array, sizeof(HE*) * (xhv->xhv_max + 1), char);
- else
+ )
+ Newz(503, xhv->xhv_array /* HvARRAY(hv) */,
+ PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */),
+ char);
+ else {
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
return 0;
+ }
}
- i = klen;
- hash = 0;
- s = key;
- while (i--)
- hash = hash * 33 + *s++;
+ PERL_HASH(hash, key, klen);
+ /* entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
entry = ((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
- for (; entry; entry = entry->hent_next) {
- if (entry->hent_hash != hash) /* strings can't be equal */
+ for (; entry; entry = HeNEXT(entry)) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
continue;
- if (entry->hent_klen != klen)
+ if (HeKLEN(entry) != (I32)klen)
continue;
- if (bcmp(entry->hent_key,key,klen)) /* is this it? */
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
- return &entry->hent_val;
+ /* flags is 0 if not utf8. need HeKFLAGS(entry) also 0.
+ flags is 1 if utf8. need HeKFLAGS(entry) also 1.
+ xor is true if bits differ, in which case this isn't a match. */
+ if ((HeKFLAGS(entry) ^ flags) & HVhek_UTF8)
+ continue;
+ if (lval && HeKFLAGS(entry) != flags) {
+ /* We match if HVhek_UTF8 bit in our flags and hash key's match.
+ But if entry was set previously with HVhek_WASUTF8 and key now
+ doesn't (or vice versa) then we should change the key's flag,
+ as this is assignment. */
+ if (HvSHAREKEYS(hv)) {
+ /* Need to swap the key we have for a key with the flags we
+ need. As keys are shared we can't just write to the flag,
+ so we share the new one, unshare the old one. */
+ int flags_nofree = flags & ~HVhek_FREEKEY;
+ HEK *new_hek = share_hek_flags(key, klen, hash, flags_nofree);
+ unshare_hek (HeKEY_hek(entry));
+ HeKEY_hek(entry) = new_hek;
+ }
+ else
+ HeKFLAGS(entry) = flags;
+ }
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ /* if we find a placeholder, we pretend we haven't found anything */
+ if (HeVAL(entry) == &PL_sv_undef)
+ break;
+ return &HeVAL(entry);
+
}
#ifdef DYNAMIC_ENV_FETCH /* %ENV lookup? If so, try to fetch the value now */
- if (HvNAME(hv) && strEQ(HvNAME(hv),ENV_HV_NAME)) {
- char *gotenv;
+ if (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) {
+ unsigned long len;
+ char *env = PerlEnv_ENVgetenv_len(key,&len);
+ if (env) {
+ sv = newSVpvn(env,len);
+ SvTAINTED_on(sv);
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ return hv_store(hv,key,klen,sv,hash);
+ }
+ }
+#endif
+ if (!entry && SvREADONLY(hv)) {
+ S_hv_notallowed(aTHX_ flags, key, klen,
+ "access disallowed key '%"SVf"' in"
+ );
+ }
+ if (lval) { /* gonna assign to this, so it better be there */
+ sv = NEWSV(61,0);
+ return hv_store_flags(hv,key,klen,sv,hash,flags);
+ }
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ return 0;
+}
- gotenv = my_getenv(key);
- if (gotenv != NULL) {
- sv = newSVpv(gotenv,strlen(gotenv));
- return hv_store(hv,key,klen,sv,hash);
- }
+/* returns an HE * structure with the all fields set */
+/* note that hent_val will be a mortal sv for MAGICAL hashes */
+/*
+=for apidoc hv_fetch_ent
+
+Returns the hash entry which corresponds to the specified key in the hash.
+C<hash> must be a valid precomputed hash number for the given C<key>, or 0
+if you want the function to compute it. IF C<lval> is set then the fetch
+will be part of a store. Make sure the return value is non-null before
+accessing it. The return value when C<tb> is a tied hash is a pointer to a
+static location, so be sure to make a copy of the structure if you need to
+store it somewhere.
+
+See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
+information on how to use this function on tied hashes.
+
+=cut
+*/
+
+HE *
+Perl_hv_fetch_ent(pTHX_ HV *hv, SV *keysv, I32 lval, register U32 hash)
+{
+ register XPVHV* xhv;
+ register char *key;
+ STRLEN klen;
+ register HE *entry;
+ SV *sv;
+ bool is_utf8;
+ int flags = 0;
+ char *keysave;
+
+ if (!hv)
+ return 0;
+
+ if (SvRMAGICAL(hv)) {
+ if (mg_find((SV*)hv, PERL_MAGIC_tied) || SvGMAGICAL((SV*)hv)) {
+ sv = sv_newmortal();
+ keysv = sv_2mortal(newSVsv(keysv));
+ mg_copy((SV*)hv, sv, (char*)keysv, HEf_SVKEY);
+ if (!HeKEY_hek(&PL_hv_fetch_ent_mh)) {
+ char *k;
+ New(54, k, HEK_BASESIZE + sizeof(SV*), char);
+ HeKEY_hek(&PL_hv_fetch_ent_mh) = (HEK*)k;
+ }
+ HeSVKEY_set(&PL_hv_fetch_ent_mh, keysv);
+ HeVAL(&PL_hv_fetch_ent_mh) = sv;
+ return &PL_hv_fetch_ent_mh;
+ }
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ U32 i;
+ key = SvPV(keysv, klen);
+ for (i = 0; i < klen; ++i)
+ if (isLOWER(key[i])) {
+ SV *nkeysv = sv_2mortal(newSVpvn(key,klen));
+ (void)strupr(SvPVX(nkeysv));
+ entry = hv_fetch_ent(hv, nkeysv, 0, 0);
+ if (!entry && lval)
+ entry = hv_store_ent(hv, keysv, NEWSV(61,0), hash);
+ return entry;
+ }
+ }
+#endif
}
+
+ xhv = (XPVHV*)SvANY(hv);
+ if (!xhv->xhv_array /* !HvARRAY(hv) */) {
+ if (lval
+#ifdef DYNAMIC_ENV_FETCH /* if it's an %ENV lookup, we may get it on the fly */
+ || (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env))
#endif
+ )
+ Newz(503, xhv->xhv_array /* HvARRAY(hv) */,
+ PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */),
+ char);
+ else
+ return 0;
+ }
+
+ keysave = key = SvPV(keysv, klen);
+ is_utf8 = (SvUTF8(keysv)!=0);
+
+ if (is_utf8) {
+ key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8);
+ if (is_utf8)
+ flags = HVhek_UTF8;
+ if (key != keysave)
+ flags |= HVhek_WASUTF8 | HVhek_FREEKEY;
+ }
+
+ if (!hash)
+ PERL_HASH(hash, key, klen);
+
+ /* entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
+ entry = ((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
+ for (; entry; entry = HeNEXT(entry)) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
+ continue;
+ if (HeKLEN(entry) != (I32)klen)
+ continue;
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
+ continue;
+ if ((HeKFLAGS(entry) ^ flags) & HVhek_UTF8)
+ continue;
+ if (lval && HeKFLAGS(entry) != flags) {
+ /* We match if HVhek_UTF8 bit in our flags and hash key's match.
+ But if entry was set previously with HVhek_WASUTF8 and key now
+ doesn't (or vice versa) then we should change the key's flag,
+ as this is assignment. */
+ if (HvSHAREKEYS(hv)) {
+ /* Need to swap the key we have for a key with the flags we
+ need. As keys are shared we can't just write to the flag,
+ so we share the new one, unshare the old one. */
+ int flags_nofree = flags & ~HVhek_FREEKEY;
+ HEK *new_hek = share_hek_flags(key, klen, hash, flags_nofree);
+ unshare_hek (HeKEY_hek(entry));
+ HeKEY_hek(entry) = new_hek;
+ }
+ else
+ HeKFLAGS(entry) = flags;
+ }
+ if (key != keysave)
+ Safefree(key);
+ /* if we find a placeholder, we pretend we haven't found anything */
+ if (HeVAL(entry) == &PL_sv_undef)
+ break;
+ return entry;
+ }
+#ifdef DYNAMIC_ENV_FETCH /* %ENV lookup? If so, try to fetch the value now */
+ if (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) {
+ unsigned long len;
+ char *env = PerlEnv_ENVgetenv_len(key,&len);
+ if (env) {
+ sv = newSVpvn(env,len);
+ SvTAINTED_on(sv);
+ return hv_store_ent(hv,keysv,sv,hash);
+ }
+ }
+#endif
+ if (!entry && SvREADONLY(hv)) {
+ S_hv_notallowed(aTHX_ flags, key, klen,
+ "access disallowed key '%"SVf"' in"
+ );
+ }
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
if (lval) { /* gonna assign to this, so it better be there */
sv = NEWSV(61,0);
- return hv_store(hv,key,klen,sv,hash);
+ return hv_store_ent(hv,keysv,sv,hash);
}
return 0;
}
+STATIC void
+S_hv_magic_check(pTHX_ HV *hv, bool *needs_copy, bool *needs_store)
+{
+ MAGIC *mg = SvMAGIC(hv);
+ *needs_copy = FALSE;
+ *needs_store = TRUE;
+ while (mg) {
+ if (isUPPER(mg->mg_type)) {
+ *needs_copy = TRUE;
+ switch (mg->mg_type) {
+ case PERL_MAGIC_tied:
+ case PERL_MAGIC_sig:
+ *needs_store = FALSE;
+ }
+ }
+ mg = mg->mg_moremagic;
+ }
+}
+
+/*
+=for apidoc hv_store
+
+Stores an SV in a hash. The hash key is specified as C<key> and C<klen> is
+the length of the key. The C<hash> parameter is the precomputed hash
+value; if it is zero then Perl will compute it. The return value will be
+NULL if the operation failed or if the value did not need to be actually
+stored within the hash (as in the case of tied hashes). Otherwise it can
+be dereferenced to get the original C<SV*>. Note that the caller is
+responsible for suitably incrementing the reference count of C<val> before
+the call, and decrementing it if the function returned NULL.
+
+See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
+information on how to use this function on tied hashes.
+
+=cut
+*/
+
+SV**
+Perl_hv_store(pTHX_ HV *hv, const char *key, I32 klen, SV *val, U32 hash)
+{
+ bool is_utf8 = FALSE;
+ const char *keysave = key;
+ int flags = 0;
+
+ if (klen < 0) {
+ klen = -klen;
+ is_utf8 = TRUE;
+ }
+
+ if (is_utf8) {
+ STRLEN tmplen = klen;
+ /* Just casting the &klen to (STRLEN) won't work well
+ * if STRLEN and I32 are of different widths. --jhi */
+ key = (char*)bytes_from_utf8((U8*)key, &tmplen, &is_utf8);
+ klen = tmplen;
+ /* If we were able to downgrade here, then than means that we were
+ passed in a key which only had chars 0-255, but was utf8 encoded. */
+ if (is_utf8)
+ flags = HVhek_UTF8;
+ /* If we found we were able to downgrade the string to bytes, then
+ we should flag that it needs upgrading on keys or each. */
+ if (key != keysave)
+ flags |= HVhek_WASUTF8 | HVhek_FREEKEY;
+ }
+
+ return hv_store_flags (hv, key, klen, val, hash, flags);
+}
+
SV**
-hv_store(hv,key,klen,val,hash)
-HV *hv;
-char *key;
-U32 klen;
-SV *val;
-register U32 hash;
+Perl_hv_store_flags(pTHX_ HV *hv, const char *key, I32 klen, SV *val,
+ register U32 hash, int flags)
{
register XPVHV* xhv;
- register char *s;
register I32 i;
register HE *entry;
register HE **oentry;
xhv = (XPVHV*)SvANY(hv);
if (SvMAGICAL(hv)) {
- mg_copy((SV*)hv, val, key, klen);
-#ifndef OVERLOAD
- if (!xhv->xhv_array)
- return 0;
-#else
- if (!xhv->xhv_array && (SvMAGIC(hv)->mg_type != 'A'
- || SvMAGIC(hv)->mg_moremagic))
- return 0;
-#endif /* OVERLOAD */
- }
- if (!hash) {
- i = klen;
- s = key;
- while (i--)
- hash = hash * 33 + *s++;
+ bool needs_copy;
+ bool needs_store;
+ hv_magic_check (hv, &needs_copy, &needs_store);
+ if (needs_copy) {
+ mg_copy((SV*)hv, val, key, klen);
+ if (!xhv->xhv_array /* !HvARRAY */ && !needs_store) {
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ return 0;
+ }
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ key = savepvn(key,klen);
+ key = (const char*)strupr((char*)key);
+ hash = 0;
+ }
+#endif
+ }
}
- if (!xhv->xhv_array)
- Newz(505, xhv->xhv_array, sizeof(HE**) * (xhv->xhv_max + 1), char);
+ if (flags)
+ HvHASKFLAGS_on((SV*)hv);
+
+ if (!hash)
+ PERL_HASH(hash, key, klen);
+
+ if (!xhv->xhv_array /* !HvARRAY(hv) */)
+ Newz(505, xhv->xhv_array /* HvARRAY(hv) */,
+ PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */),
+ char);
+ /* oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
i = 1;
- for (entry = *oentry; entry; i=0, entry = entry->hent_next) {
- if (entry->hent_hash != hash) /* strings can't be equal */
+ for (entry = *oentry; entry; i=0, entry = HeNEXT(entry)) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
continue;
- if (entry->hent_klen != klen)
+ if (HeKLEN(entry) != (I32)klen)
continue;
- if (bcmp(entry->hent_key,key,klen)) /* is this it? */
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
- SvREFCNT_dec(entry->hent_val);
- entry->hent_val = val;
- return &entry->hent_val;
+ if ((HeKFLAGS(entry) ^ flags) & HVhek_UTF8)
+ continue;
+ if (HeVAL(entry) == &PL_sv_undef)
+ xhv->xhv_placeholders--; /* yes, can store into placeholder slot */
+ else
+ SvREFCNT_dec(HeVAL(entry));
+ if (flags & HVhek_PLACEHOLD) {
+ /* We have been requested to insert a placeholder. Currently
+ only Storable is allowed to do this. */
+ xhv->xhv_placeholders++;
+ HeVAL(entry) = &PL_sv_undef;
+ } else
+ HeVAL(entry) = val;
+
+ if (HeKFLAGS(entry) != flags) {
+ /* We match if HVhek_UTF8 bit in our flags and hash key's match.
+ But if entry was set previously with HVhek_WASUTF8 and key now
+ doesn't (or vice versa) then we should change the key's flag,
+ as this is assignment. */
+ if (HvSHAREKEYS(hv)) {
+ /* Need to swap the key we have for a key with the flags we
+ need. As keys are shared we can't just write to the flag,
+ so we share the new one, unshare the old one. */
+ int flags_nofree = flags & ~HVhek_FREEKEY;
+ HEK *new_hek = share_hek_flags(key, klen, hash, flags_nofree);
+ unshare_hek (HeKEY_hek(entry));
+ HeKEY_hek(entry) = new_hek;
+ }
+ else
+ HeKFLAGS(entry) = flags;
+ }
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ return &HeVAL(entry);
}
- New(501,entry, 1, HE);
- entry->hent_klen = klen;
- entry->hent_key = savepvn(key,klen);
- entry->hent_val = val;
- entry->hent_hash = hash;
- entry->hent_next = *oentry;
+ if (SvREADONLY(hv)) {
+ S_hv_notallowed(aTHX_ flags, key, klen,
+ "access disallowed key '%"SVf"' to"
+ );
+ }
+
+ entry = new_HE();
+ /* share_hek_flags will do the free for us. This might be considered
+ bad API design. */
+ if (HvSHAREKEYS(hv))
+ HeKEY_hek(entry) = share_hek_flags(key, klen, hash, flags);
+ else /* gotta do the real thing */
+ HeKEY_hek(entry) = save_hek_flags(key, klen, hash, flags);
+ if (flags & HVhek_PLACEHOLD) {
+ /* We have been requested to insert a placeholder. Currently
+ only Storable is allowed to do this. */
+ xhv->xhv_placeholders++;
+ HeVAL(entry) = &PL_sv_undef;
+ } else
+ HeVAL(entry) = val;
+ HeNEXT(entry) = *oentry;
*oentry = entry;
- xhv->xhv_keys++;
+ xhv->xhv_keys++; /* HvKEYS(hv)++ */
if (i) { /* initial entry? */
- ++xhv->xhv_fill;
- if (xhv->xhv_keys > xhv->xhv_max)
+ xhv->xhv_fill++; /* HvFILL(hv)++ */
+ if (xhv->xhv_keys > (IV)xhv->xhv_max /* HvKEYS(hv) > HvMAX(hv) */)
hsplit(hv);
}
- return &entry->hent_val;
+ return &HeVAL(entry);
}
+/*
+=for apidoc hv_store_ent
+
+Stores C<val> in a hash. The hash key is specified as C<key>. The C<hash>
+parameter is the precomputed hash value; if it is zero then Perl will
+compute it. The return value is the new hash entry so created. It will be
+NULL if the operation failed or if the value did not need to be actually
+stored within the hash (as in the case of tied hashes). Otherwise the
+contents of the return value can be accessed using the C<He?> macros
+described here. Note that the caller is responsible for suitably
+incrementing the reference count of C<val> before the call, and
+decrementing it if the function returned NULL.
+
+See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
+information on how to use this function on tied hashes.
+
+=cut
+*/
+
+HE *
+Perl_hv_store_ent(pTHX_ HV *hv, SV *keysv, SV *val, U32 hash)
+{
+ XPVHV* xhv;
+ char *key;
+ STRLEN klen;
+ I32 i;
+ HE *entry;
+ HE **oentry;
+ bool is_utf8;
+ int flags = 0;
+ char *keysave;
+
+ if (!hv)
+ return 0;
+
+ xhv = (XPVHV*)SvANY(hv);
+ if (SvMAGICAL(hv)) {
+ bool needs_copy;
+ bool needs_store;
+ hv_magic_check (hv, &needs_copy, &needs_store);
+ if (needs_copy) {
+ bool save_taint = PL_tainted;
+ if (PL_tainting)
+ PL_tainted = SvTAINTED(keysv);
+ keysv = sv_2mortal(newSVsv(keysv));
+ mg_copy((SV*)hv, val, (char*)keysv, HEf_SVKEY);
+ TAINT_IF(save_taint);
+ if (!xhv->xhv_array /* !HvARRAY(hv) */ && !needs_store)
+ return Nullhe;
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ key = SvPV(keysv, klen);
+ keysv = sv_2mortal(newSVpvn(key,klen));
+ (void)strupr(SvPVX(keysv));
+ hash = 0;
+ }
+#endif
+ }
+ }
+
+ keysave = key = SvPV(keysv, klen);
+ is_utf8 = (SvUTF8(keysv) != 0);
+
+ if (is_utf8) {
+ key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8);
+ if (is_utf8)
+ flags = HVhek_UTF8;
+ if (key != keysave)
+ flags |= HVhek_WASUTF8 | HVhek_FREEKEY;
+ HvHASKFLAGS_on((SV*)hv);
+ }
+
+ if (!hash)
+ PERL_HASH(hash, key, klen);
+
+ if (!xhv->xhv_array /* !HvARRAY(hv) */)
+ Newz(505, xhv->xhv_array /* HvARRAY(hv) */,
+ PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */),
+ char);
+
+ /* oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
+ oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
+ i = 1;
+ entry = *oentry;
+ for (; entry; i=0, entry = HeNEXT(entry)) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
+ continue;
+ if (HeKLEN(entry) != (I32)klen)
+ continue;
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
+ continue;
+ if ((HeKFLAGS(entry) ^ flags) & HVhek_UTF8)
+ continue;
+ if (HeVAL(entry) == &PL_sv_undef)
+ xhv->xhv_placeholders--; /* yes, can store into placeholder slot */
+ else
+ SvREFCNT_dec(HeVAL(entry));
+ HeVAL(entry) = val;
+ if (HeKFLAGS(entry) != flags) {
+ /* We match if HVhek_UTF8 bit in our flags and hash key's match.
+ But if entry was set previously with HVhek_WASUTF8 and key now
+ doesn't (or vice versa) then we should change the key's flag,
+ as this is assignment. */
+ if (HvSHAREKEYS(hv)) {
+ /* Need to swap the key we have for a key with the flags we
+ need. As keys are shared we can't just write to the flag,
+ so we share the new one, unshare the old one. */
+ int flags_nofree = flags & ~HVhek_FREEKEY;
+ HEK *new_hek = share_hek_flags(key, klen, hash, flags_nofree);
+ unshare_hek (HeKEY_hek(entry));
+ HeKEY_hek(entry) = new_hek;
+ }
+ else
+ HeKFLAGS(entry) = flags;
+ }
+ if (flags & HVhek_FREEKEY)
+ Safefree(key);
+ return entry;
+ }
+
+ if (SvREADONLY(hv)) {
+ S_hv_notallowed(aTHX_ flags, key, klen,
+ "access disallowed key '%"SVf"' to"
+ );
+ }
+
+ entry = new_HE();
+ /* share_hek_flags will do the free for us. This might be considered
+ bad API design. */
+ if (HvSHAREKEYS(hv))
+ HeKEY_hek(entry) = share_hek_flags(key, klen, hash, flags);
+ else /* gotta do the real thing */
+ HeKEY_hek(entry) = save_hek_flags(key, klen, hash, flags);
+ HeVAL(entry) = val;
+ HeNEXT(entry) = *oentry;
+ *oentry = entry;
+
+ xhv->xhv_keys++; /* HvKEYS(hv)++ */
+ if (i) { /* initial entry? */
+ xhv->xhv_fill++; /* HvFILL(hv)++ */
+ if (xhv->xhv_keys > (IV)xhv->xhv_max /* HvKEYS(hv) > HvMAX(hv) */)
+ hsplit(hv);
+ }
+
+ return entry;
+}
+
+/*
+=for apidoc hv_delete
+
+Deletes a key/value pair in the hash. The value SV is removed from the
+hash and returned to the caller. The C<klen> is the length of the key.
+The C<flags> value will normally be zero; if set to G_DISCARD then NULL
+will be returned.
+
+=cut
+*/
+
SV *
-hv_delete(hv,key,klen,flags)
-HV *hv;
-char *key;
-U32 klen;
-I32 flags;
+Perl_hv_delete(pTHX_ HV *hv, const char *key, I32 klen, I32 flags)
{
register XPVHV* xhv;
- register char *s;
register I32 i;
- register I32 hash;
+ register U32 hash;
register HE *entry;
register HE **oentry;
+ SV **svp;
SV *sv;
+ bool is_utf8 = FALSE;
+ int k_flags = 0;
+ const char *keysave = key;
if (!hv)
return Nullsv;
+ if (klen < 0) {
+ klen = -klen;
+ is_utf8 = TRUE;
+ }
if (SvRMAGICAL(hv)) {
- sv = *hv_fetch(hv, key, klen, TRUE);
- mg_clear(sv);
- if (mg_find(sv, 'p')) {
- sv_unmagic(sv, 'p'); /* No longer an element */
- return sv;
+ bool needs_copy;
+ bool needs_store;
+ hv_magic_check (hv, &needs_copy, &needs_store);
+
+ if (needs_copy && (svp = hv_fetch(hv, key, klen, TRUE))) {
+ sv = *svp;
+ mg_clear(sv);
+ if (!needs_store) {
+ if (mg_find(sv, PERL_MAGIC_tiedelem)) {
+ /* No longer an element */
+ sv_unmagic(sv, PERL_MAGIC_tiedelem);
+ return sv;
+ }
+ return Nullsv; /* element cannot be deleted */
+ }
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ sv = sv_2mortal(newSVpvn(key,klen));
+ key = strupr(SvPVX(sv));
+ }
+#endif
+ }
+ }
+ xhv = (XPVHV*)SvANY(hv);
+ if (!xhv->xhv_array /* !HvARRAY(hv) */)
+ return Nullsv;
+
+ if (is_utf8) {
+ STRLEN tmplen = klen;
+ /* See the note in hv_fetch(). --jhi */
+ key = (char*)bytes_from_utf8((U8*)key, &tmplen, &is_utf8);
+ klen = tmplen;
+ if (is_utf8)
+ k_flags = HVhek_UTF8;
+ if (key != keysave)
+ k_flags |= HVhek_FREEKEY;
+ }
+
+ PERL_HASH(hash, key, klen);
+
+ /* oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
+ oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
+ entry = *oentry;
+ i = 1;
+ for (; entry; i=0, oentry = &HeNEXT(entry), entry = *oentry) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
+ continue;
+ if (HeKLEN(entry) != (I32)klen)
+ continue;
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
+ continue;
+ if ((HeKFLAGS(entry) ^ k_flags) & HVhek_UTF8)
+ continue;
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ /* if placeholder is here, it's already been deleted.... */
+ if (HeVAL(entry) == &PL_sv_undef)
+ {
+ if (SvREADONLY(hv))
+ return Nullsv; /* if still SvREADONLY, leave it deleted. */
+ else {
+ /* okay, really delete the placeholder... */
+ *oentry = HeNEXT(entry);
+ if (i && !*oentry)
+ xhv->xhv_fill--; /* HvFILL(hv)-- */
+ if (entry == xhv->xhv_eiter /* HvEITER(hv) */)
+ HvLAZYDEL_on(hv);
+ else
+ hv_free_ent(hv, entry);
+ xhv->xhv_keys--; /* HvKEYS(hv)-- */
+ if (xhv->xhv_keys == 0)
+ HvHASKFLAGS_off(hv);
+ xhv->xhv_placeholders--;
+ return Nullsv;
+ }
+ }
+ else if (SvREADONLY(hv) && HeVAL(entry) && SvREADONLY(HeVAL(entry))) {
+ S_hv_notallowed(aTHX_ k_flags, key, klen,
+ "delete readonly key '%"SVf"' from"
+ );
+ }
+
+ if (flags & G_DISCARD)
+ sv = Nullsv;
+ else {
+ sv = sv_2mortal(HeVAL(entry));
+ HeVAL(entry) = &PL_sv_undef;
+ }
+
+ /*
+ * If a restricted hash, rather than really deleting the entry, put
+ * a placeholder there. This marks the key as being "approved", so
+ * we can still access via not-really-existing key without raising
+ * an error.
+ */
+ if (SvREADONLY(hv)) {
+ HeVAL(entry) = &PL_sv_undef;
+ /* We'll be saving this slot, so the number of allocated keys
+ * doesn't go down, but the number placeholders goes up */
+ xhv->xhv_placeholders++; /* HvPLACEHOLDERS(hv)++ */
+ } else {
+ *oentry = HeNEXT(entry);
+ if (i && !*oentry)
+ xhv->xhv_fill--; /* HvFILL(hv)-- */
+ if (entry == xhv->xhv_eiter /* HvEITER(hv) */)
+ HvLAZYDEL_on(hv);
+ else
+ hv_free_ent(hv, entry);
+ xhv->xhv_keys--; /* HvKEYS(hv)-- */
+ if (xhv->xhv_keys == 0)
+ HvHASKFLAGS_off(hv);
+ }
+ return sv;
+ }
+ if (SvREADONLY(hv)) {
+ S_hv_notallowed(aTHX_ k_flags, key, klen,
+ "access disallowed key '%"SVf"' from"
+ );
+ }
+
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ return Nullsv;
+}
+
+/*
+=for apidoc hv_delete_ent
+
+Deletes a key/value pair in the hash. The value SV is removed from the
+hash and returned to the caller. The C<flags> value will normally be zero;
+if set to G_DISCARD then NULL will be returned. C<hash> can be a valid
+precomputed hash value, or 0 to ask for it to be computed.
+
+=cut
+*/
+
+SV *
+Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash)
+{
+ register XPVHV* xhv;
+ register I32 i;
+ register char *key;
+ STRLEN klen;
+ register HE *entry;
+ register HE **oentry;
+ SV *sv;
+ bool is_utf8;
+ int k_flags = 0;
+ char *keysave;
+
+ if (!hv)
+ return Nullsv;
+ if (SvRMAGICAL(hv)) {
+ bool needs_copy;
+ bool needs_store;
+ hv_magic_check (hv, &needs_copy, &needs_store);
+
+ if (needs_copy && (entry = hv_fetch_ent(hv, keysv, TRUE, hash))) {
+ sv = HeVAL(entry);
+ mg_clear(sv);
+ if (!needs_store) {
+ if (mg_find(sv, PERL_MAGIC_tiedelem)) {
+ /* No longer an element */
+ sv_unmagic(sv, PERL_MAGIC_tiedelem);
+ return sv;
+ }
+ return Nullsv; /* element cannot be deleted */
+ }
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ key = SvPV(keysv, klen);
+ keysv = sv_2mortal(newSVpvn(key,klen));
+ (void)strupr(SvPVX(keysv));
+ hash = 0;
+ }
+#endif
+ }
+ }
+ xhv = (XPVHV*)SvANY(hv);
+ if (!xhv->xhv_array /* !HvARRAY(hv) */)
+ return Nullsv;
+
+ keysave = key = SvPV(keysv, klen);
+ is_utf8 = (SvUTF8(keysv) != 0);
+
+ if (is_utf8) {
+ key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8);
+ if (is_utf8)
+ k_flags = HVhek_UTF8;
+ if (key != keysave)
+ k_flags |= HVhek_FREEKEY;
+ }
+
+ if (!hash)
+ PERL_HASH(hash, key, klen);
+
+ /* oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
+ oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
+ entry = *oentry;
+ i = 1;
+ for (; entry; i=0, oentry = &HeNEXT(entry), entry = *oentry) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
+ continue;
+ if (HeKLEN(entry) != (I32)klen)
+ continue;
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
+ continue;
+ if ((HeKFLAGS(entry) ^ k_flags) & HVhek_UTF8)
+ continue;
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+
+ /* if placeholder is here, it's already been deleted.... */
+ if (HeVAL(entry) == &PL_sv_undef)
+ {
+ if (SvREADONLY(hv))
+ return Nullsv; /* if still SvREADONLY, leave it deleted. */
+
+ /* okay, really delete the placeholder. */
+ *oentry = HeNEXT(entry);
+ if (i && !*oentry)
+ xhv->xhv_fill--; /* HvFILL(hv)-- */
+ if (entry == xhv->xhv_eiter /* HvEITER(hv) */)
+ HvLAZYDEL_on(hv);
+ else
+ hv_free_ent(hv, entry);
+ xhv->xhv_keys--; /* HvKEYS(hv)-- */
+ if (xhv->xhv_keys == 0)
+ HvHASKFLAGS_off(hv);
+ xhv->xhv_placeholders--;
+ return Nullsv;
+ }
+ else if (SvREADONLY(hv) && HeVAL(entry) && SvREADONLY(HeVAL(entry))) {
+ S_hv_notallowed(aTHX_ k_flags, key, klen,
+ "delete readonly key '%"SVf"' from"
+ );
+ }
+
+ if (flags & G_DISCARD)
+ sv = Nullsv;
+ else {
+ sv = sv_2mortal(HeVAL(entry));
+ HeVAL(entry) = &PL_sv_undef;
+ }
+
+ /*
+ * If a restricted hash, rather than really deleting the entry, put
+ * a placeholder there. This marks the key as being "approved", so
+ * we can still access via not-really-existing key without raising
+ * an error.
+ */
+ if (SvREADONLY(hv)) {
+ HeVAL(entry) = &PL_sv_undef;
+ /* We'll be saving this slot, so the number of allocated keys
+ * doesn't go down, but the number placeholders goes up */
+ xhv->xhv_placeholders++; /* HvPLACEHOLDERS(hv)++ */
+ } else {
+ *oentry = HeNEXT(entry);
+ if (i && !*oentry)
+ xhv->xhv_fill--; /* HvFILL(hv)-- */
+ if (entry == xhv->xhv_eiter /* HvEITER(hv) */)
+ HvLAZYDEL_on(hv);
+ else
+ hv_free_ent(hv, entry);
+ xhv->xhv_keys--; /* HvKEYS(hv)-- */
+ if (xhv->xhv_keys == 0)
+ HvHASKFLAGS_off(hv);
}
+ return sv;
+ }
+ if (SvREADONLY(hv)) {
+ S_hv_notallowed(aTHX_ k_flags, key, klen,
+ "delete disallowed key '%"SVf"' from"
+ );
+ }
+
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ return Nullsv;
+}
+
+/*
+=for apidoc hv_exists
+
+Returns a boolean indicating whether the specified hash key exists. The
+C<klen> is the length of the key.
+
+=cut
+*/
+
+bool
+Perl_hv_exists(pTHX_ HV *hv, const char *key, I32 klen)
+{
+ register XPVHV* xhv;
+ register U32 hash;
+ register HE *entry;
+ SV *sv;
+ bool is_utf8 = FALSE;
+ const char *keysave = key;
+ int k_flags = 0;
+
+ if (!hv)
+ return 0;
+
+ if (klen < 0) {
+ klen = -klen;
+ is_utf8 = TRUE;
+ }
+
+ if (SvRMAGICAL(hv)) {
+ if (mg_find((SV*)hv, PERL_MAGIC_tied) || SvGMAGICAL((SV*)hv)) {
+ sv = sv_newmortal();
+ mg_copy((SV*)hv, sv, key, klen);
+ magic_existspack(sv, mg_find(sv, PERL_MAGIC_tiedelem));
+ return (bool)SvTRUE(sv);
+ }
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ sv = sv_2mortal(newSVpvn(key,klen));
+ key = strupr(SvPVX(sv));
+ }
+#endif
+ }
+
+ xhv = (XPVHV*)SvANY(hv);
+#ifndef DYNAMIC_ENV_FETCH
+ if (!xhv->xhv_array /* !HvARRAY(hv) */)
+ return 0;
+#endif
+
+ if (is_utf8) {
+ STRLEN tmplen = klen;
+ /* See the note in hv_fetch(). --jhi */
+ key = (char*)bytes_from_utf8((U8*)key, &tmplen, &is_utf8);
+ klen = tmplen;
+ if (is_utf8)
+ k_flags = HVhek_UTF8;
+ if (key != keysave)
+ k_flags |= HVhek_FREEKEY;
}
- xhv = (XPVHV*)SvANY(hv);
- if (!xhv->xhv_array)
- return Nullsv;
- i = klen;
- hash = 0;
- s = key;
- while (i--)
- hash = hash * 33 + *s++;
- oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
- entry = *oentry;
- i = 1;
- for (; entry; i=0, oentry = &entry->hent_next, entry = *oentry) {
- if (entry->hent_hash != hash) /* strings can't be equal */
+ PERL_HASH(hash, key, klen);
+
+#ifdef DYNAMIC_ENV_FETCH
+ if (!xhv->xhv_array /* !HvARRAY(hv) */) entry = Null(HE*);
+ else
+#endif
+ /* entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
+ entry = ((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
+ for (; entry; entry = HeNEXT(entry)) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
continue;
- if (entry->hent_klen != klen)
+ if (HeKLEN(entry) != klen)
continue;
- if (bcmp(entry->hent_key,key,klen)) /* is this it? */
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
- *oentry = entry->hent_next;
- if (i && !*oentry)
- xhv->xhv_fill--;
- if (flags & G_DISCARD)
- sv = Nullsv;
- else
- sv = sv_mortalcopy(entry->hent_val);
- if (entry == xhv->xhv_eiter)
- entry->hent_klen = -1;
- else
- he_free(entry);
- --xhv->xhv_keys;
- return sv;
+ if ((HeKFLAGS(entry) ^ k_flags) & HVhek_UTF8)
+ continue;
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ /* If we find the key, but the value is a placeholder, return false. */
+ if (HeVAL(entry) == &PL_sv_undef)
+ return FALSE;
+
+ return TRUE;
}
- return Nullsv;
+#ifdef DYNAMIC_ENV_FETCH /* is it out there? */
+ if (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) {
+ unsigned long len;
+ char *env = PerlEnv_ENVgetenv_len(key,&len);
+ if (env) {
+ sv = newSVpvn(env,len);
+ SvTAINTED_on(sv);
+ (void)hv_store(hv,key,klen,sv,hash);
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ return TRUE;
+ }
+ }
+#endif
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ return FALSE;
}
+
+/*
+=for apidoc hv_exists_ent
+
+Returns a boolean indicating whether the specified hash key exists. C<hash>
+can be a valid precomputed hash value, or 0 to ask for it to be
+computed.
+
+=cut
+*/
+
bool
-hv_exists(hv,key,klen)
-HV *hv;
-char *key;
-U32 klen;
+Perl_hv_exists_ent(pTHX_ HV *hv, SV *keysv, U32 hash)
{
register XPVHV* xhv;
- register char *s;
- register I32 i;
- register I32 hash;
+ register char *key;
+ STRLEN klen;
register HE *entry;
SV *sv;
+ bool is_utf8;
+ char *keysave;
+ int k_flags = 0;
if (!hv)
return 0;
if (SvRMAGICAL(hv)) {
- if (mg_find((SV*)hv,'P')) {
+ if (mg_find((SV*)hv, PERL_MAGIC_tied) || SvGMAGICAL((SV*)hv)) {
+ SV* svret = sv_newmortal();
sv = sv_newmortal();
- mg_copy((SV*)hv, sv, key, klen);
- magic_existspack(sv, mg_find(sv, 'p'));
- return SvTRUE(sv);
+ keysv = sv_2mortal(newSVsv(keysv));
+ mg_copy((SV*)hv, sv, (char*)keysv, HEf_SVKEY);
+ magic_existspack(svret, mg_find(sv, PERL_MAGIC_tiedelem));
+ return (bool)SvTRUE(svret);
}
+#ifdef ENV_IS_CASELESS
+ else if (mg_find((SV*)hv, PERL_MAGIC_env)) {
+ key = SvPV(keysv, klen);
+ keysv = sv_2mortal(newSVpvn(key,klen));
+ (void)strupr(SvPVX(keysv));
+ hash = 0;
+ }
+#endif
}
xhv = (XPVHV*)SvANY(hv);
- if (!xhv->xhv_array)
- return 0;
+#ifndef DYNAMIC_ENV_FETCH
+ if (!xhv->xhv_array /* !HvARRAY(hv) */)
+ return 0;
+#endif
- i = klen;
- hash = 0;
- s = key;
- while (i--)
- hash = hash * 33 + *s++;
+ keysave = key = SvPV(keysv, klen);
+ is_utf8 = (SvUTF8(keysv) != 0);
+ if (is_utf8) {
+ key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8);
+ if (is_utf8)
+ k_flags = HVhek_UTF8;
+ if (key != keysave)
+ k_flags |= HVhek_FREEKEY;
+ }
+ if (!hash)
+ PERL_HASH(hash, key, klen);
+#ifdef DYNAMIC_ENV_FETCH
+ if (!xhv->xhv_array /* !HvARRAY(hv) */) entry = Null(HE*);
+ else
+#endif
+ /* entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
entry = ((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
- for (; entry; entry = entry->hent_next) {
- if (entry->hent_hash != hash) /* strings can't be equal */
+ for (; entry; entry = HeNEXT(entry)) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
+ continue;
+ if (HeKLEN(entry) != (I32)klen)
continue;
- if (entry->hent_klen != klen)
+ if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
- if (bcmp(entry->hent_key,key,klen)) /* is this it? */
+ if ((HeKFLAGS(entry) ^ k_flags) & HVhek_UTF8)
continue;
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ /* If we find the key, but the value is a placeholder, return false. */
+ if (HeVAL(entry) == &PL_sv_undef)
+ return FALSE;
return TRUE;
}
+#ifdef DYNAMIC_ENV_FETCH /* is it out there? */
+ if (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) {
+ unsigned long len;
+ char *env = PerlEnv_ENVgetenv_len(key,&len);
+ if (env) {
+ sv = newSVpvn(env,len);
+ SvTAINTED_on(sv);
+ (void)hv_store_ent(hv,keysv,sv,hash);
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
+ return TRUE;
+ }
+ }
+#endif
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(key);
return FALSE;
}
-static void
-hsplit(hv)
-HV *hv;
+STATIC void
+S_hsplit(pTHX_ HV *hv)
{
register XPVHV* xhv = (XPVHV*)SvANY(hv);
- I32 oldsize = (I32) xhv->xhv_max + 1; /* sic(k) */
+ I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */
register I32 newsize = oldsize * 2;
register I32 i;
- register HE **a;
- register HE **b;
+ register char *a = xhv->xhv_array; /* HvARRAY(hv) */
+ register HE **aep;
+ register HE **bep;
+ register HE *entry;
+ register HE **oentry;
+
+ PL_nomemok = TRUE;
+#if defined(STRANGE_MALLOC) || defined(MYMALLOC)
+ Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char);
+ if (!a) {
+ PL_nomemok = FALSE;
+ return;
+ }
+#else
+ New(2, a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char);
+ if (!a) {
+ PL_nomemok = FALSE;
+ return;
+ }
+ Copy(xhv->xhv_array /* HvARRAY(hv) */, a, oldsize * sizeof(HE*), char);
+ if (oldsize >= 64) {
+ offer_nice_chunk(xhv->xhv_array /* HvARRAY(hv) */,
+ PERL_HV_ARRAY_ALLOC_BYTES(oldsize));
+ }
+ else
+ Safefree(xhv->xhv_array /* HvARRAY(hv) */);
+#endif
+
+ PL_nomemok = FALSE;
+ Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/
+ xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */
+ xhv->xhv_array = a; /* HvARRAY(hv) = a */
+ aep = (HE**)a;
+
+ for (i=0; i<oldsize; i++,aep++) {
+ if (!*aep) /* non-existent */
+ continue;
+ bep = aep+oldsize;
+ for (oentry = aep, entry = *aep; entry; entry = *oentry) {
+ if ((HeHASH(entry) & newsize) != (U32)i) {
+ *oentry = HeNEXT(entry);
+ HeNEXT(entry) = *bep;
+ if (!*bep)
+ xhv->xhv_fill++; /* HvFILL(hv)++ */
+ *bep = entry;
+ continue;
+ }
+ else
+ oentry = &HeNEXT(entry);
+ }
+ if (!*aep) /* everything moved */
+ xhv->xhv_fill--; /* HvFILL(hv)-- */
+ }
+}
+
+void
+Perl_hv_ksplit(pTHX_ HV *hv, IV newmax)
+{
+ register XPVHV* xhv = (XPVHV*)SvANY(hv);
+ I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */
+ register I32 newsize;
+ register I32 i;
+ register I32 j;
+ register char *a;
+ register HE **aep;
register HE *entry;
register HE **oentry;
- a = (HE**)xhv->xhv_array;
- nomemok = TRUE;
- Renew(a, newsize, HE*);
- nomemok = FALSE;
- Zero(&a[oldsize], oldsize, HE*); /* zero 2nd half*/
- xhv->xhv_max = --newsize;
- xhv->xhv_array = (char*)a;
-
- for (i=0; i<oldsize; i++,a++) {
- if (!*a) /* non-existent */
- continue;
- b = a+oldsize;
- for (oentry = a, entry = *a; entry; entry = *oentry) {
- if ((entry->hent_hash & newsize) != i) {
- *oentry = entry->hent_next;
- entry->hent_next = *b;
- if (!*b)
- xhv->xhv_fill++;
- *b = entry;
+ newsize = (I32) newmax; /* possible truncation here */
+ if (newsize != newmax || newmax <= oldsize)
+ return;
+ while ((newsize & (1 + ~newsize)) != newsize) {
+ newsize &= ~(newsize & (1 + ~newsize)); /* get proper power of 2 */
+ }
+ if (newsize < newmax)
+ newsize *= 2;
+ if (newsize < newmax)
+ return; /* overflow detection */
+
+ a = xhv->xhv_array; /* HvARRAY(hv) */
+ if (a) {
+ PL_nomemok = TRUE;
+#if defined(STRANGE_MALLOC) || defined(MYMALLOC)
+ Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char);
+ if (!a) {
+ PL_nomemok = FALSE;
+ return;
+ }
+#else
+ New(2, a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char);
+ if (!a) {
+ PL_nomemok = FALSE;
+ return;
+ }
+ Copy(xhv->xhv_array /* HvARRAY(hv) */, a, oldsize * sizeof(HE*), char);
+ if (oldsize >= 64) {
+ offer_nice_chunk(xhv->xhv_array /* HvARRAY(hv) */,
+ PERL_HV_ARRAY_ALLOC_BYTES(oldsize));
+ }
+ else
+ Safefree(xhv->xhv_array /* HvARRAY(hv) */);
+#endif
+ PL_nomemok = FALSE;
+ Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/
+ }
+ else {
+ Newz(0, a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char);
+ }
+ xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */
+ xhv->xhv_array = a; /* HvARRAY(hv) = a */
+ if (!xhv->xhv_fill /* !HvFILL(hv) */) /* skip rest if no entries */
+ return;
+
+ aep = (HE**)a;
+ for (i=0; i<oldsize; i++,aep++) {
+ if (!*aep) /* non-existent */
+ continue;
+ for (oentry = aep, entry = *aep; entry; entry = *oentry) {
+ if ((j = (HeHASH(entry) & newsize)) != i) {
+ j -= i;
+ *oentry = HeNEXT(entry);
+ if (!(HeNEXT(entry) = aep[j]))
+ xhv->xhv_fill++; /* HvFILL(hv)++ */
+ aep[j] = entry;
continue;
}
else
- oentry = &entry->hent_next;
+ oentry = &HeNEXT(entry);
}
- if (!*a) /* everything moved */
- xhv->xhv_fill--;
+ if (!*aep) /* everything moved */
+ xhv->xhv_fill--; /* HvFILL(hv)-- */
}
}
+/*
+=for apidoc newHV
+
+Creates a new HV. The reference count is set to 1.
+
+=cut
+*/
+
HV *
-newHV()
+Perl_newHV(pTHX)
{
register HV *hv;
register XPVHV* xhv;
xhv = (XPVHV*)SvANY(hv);
SvPOK_off(hv);
SvNOK_off(hv);
- xhv->xhv_max = 7; /* start with 8 buckets */
- xhv->xhv_fill = 0;
- xhv->xhv_pmroot = 0;
+#ifndef NODEFAULT_SHAREKEYS
+ HvSHAREKEYS_on(hv); /* key-sharing on by default */
+#endif
+ xhv->xhv_max = 7; /* HvMAX(hv) = 7 (start with 8 buckets) */
+ xhv->xhv_fill = 0; /* HvFILL(hv) = 0 */
+ xhv->xhv_pmroot = 0; /* HvPMROOT(hv) = 0 */
(void)hv_iterinit(hv); /* so each() will start off right */
return hv;
}
+HV *
+Perl_newHVhv(pTHX_ HV *ohv)
+{
+ HV *hv = newHV();
+ STRLEN hv_max, hv_fill;
+
+ if (!ohv || (hv_fill = HvFILL(ohv)) == 0)
+ return hv;
+ hv_max = HvMAX(ohv);
+
+ if (!SvMAGICAL((SV *)ohv)) {
+ /* It's an ordinary hash, so copy it fast. AMS 20010804 */
+ STRLEN i;
+ bool shared = !!HvSHAREKEYS(ohv);
+ HE **ents, **oents = (HE **)HvARRAY(ohv);
+ char *a;
+ New(0, a, PERL_HV_ARRAY_ALLOC_BYTES(hv_max+1), char);
+ ents = (HE**)a;
+
+ /* In each bucket... */
+ for (i = 0; i <= hv_max; i++) {
+ HE *prev = NULL, *ent = NULL, *oent = oents[i];
+
+ if (!oent) {
+ ents[i] = NULL;
+ continue;
+ }
+
+ /* Copy the linked list of entries. */
+ for (oent = oents[i]; oent; oent = HeNEXT(oent)) {
+ U32 hash = HeHASH(oent);
+ char *key = HeKEY(oent);
+ STRLEN len = HeKLEN(oent);
+ int flags = HeKFLAGS(oent);
+
+ ent = new_HE();
+ HeVAL(ent) = newSVsv(HeVAL(oent));
+ HeKEY_hek(ent)
+ = shared ? share_hek_flags(key, len, hash, flags)
+ : save_hek_flags(key, len, hash, flags);
+ if (prev)
+ HeNEXT(prev) = ent;
+ else
+ ents[i] = ent;
+ prev = ent;
+ HeNEXT(ent) = NULL;
+ }
+ }
+
+ HvMAX(hv) = hv_max;
+ HvFILL(hv) = hv_fill;
+ HvTOTALKEYS(hv) = HvTOTALKEYS(ohv);
+ HvARRAY(hv) = ents;
+ }
+ else {
+ /* Iterate over ohv, copying keys and values one at a time. */
+ HE *entry;
+ I32 riter = HvRITER(ohv);
+ HE *eiter = HvEITER(ohv);
+
+ /* Can we use fewer buckets? (hv_max is always 2^n-1) */
+ while (hv_max && hv_max + 1 >= hv_fill * 2)
+ hv_max = hv_max / 2;
+ HvMAX(hv) = hv_max;
+
+ hv_iterinit(ohv);
+ while ((entry = hv_iternext_flags(ohv, 0))) {
+ hv_store_flags(hv, HeKEY(entry), HeKLEN(entry),
+ newSVsv(HeVAL(entry)), HeHASH(entry),
+ HeKFLAGS(entry));
+ }
+ HvRITER(ohv) = riter;
+ HvEITER(ohv) = eiter;
+ }
+
+ return hv;
+}
+
void
-he_free(hent)
-register HE *hent;
+Perl_hv_free_ent(pTHX_ HV *hv, register HE *entry)
{
- if (!hent)
+ SV *val;
+
+ if (!entry)
return;
- SvREFCNT_dec(hent->hent_val);
- Safefree(hent->hent_key);
- Safefree(hent);
+ val = HeVAL(entry);
+ if (val && isGV(val) && GvCVu(val) && HvNAME(hv))
+ PL_sub_generation++; /* may be deletion of method from stash */
+ SvREFCNT_dec(val);
+ if (HeKLEN(entry) == HEf_SVKEY) {
+ SvREFCNT_dec(HeKEY_sv(entry));
+ Safefree(HeKEY_hek(entry));
+ }
+ else if (HvSHAREKEYS(hv))
+ unshare_hek(HeKEY_hek(entry));
+ else
+ Safefree(HeKEY_hek(entry));
+ del_HE(entry);
}
void
-he_delayfree(hent)
-register HE *hent;
+Perl_hv_delayfree_ent(pTHX_ HV *hv, register HE *entry)
{
- if (!hent)
+ if (!entry)
return;
- sv_2mortal(hent->hent_val); /* free between statements */
- Safefree(hent->hent_key);
- Safefree(hent);
+ if (isGV(HeVAL(entry)) && GvCVu(HeVAL(entry)) && HvNAME(hv))
+ PL_sub_generation++; /* may be deletion of method from stash */
+ sv_2mortal(HeVAL(entry)); /* free between statements */
+ if (HeKLEN(entry) == HEf_SVKEY) {
+ sv_2mortal(HeKEY_sv(entry));
+ Safefree(HeKEY_hek(entry));
+ }
+ else if (HvSHAREKEYS(hv))
+ unshare_hek(HeKEY_hek(entry));
+ else
+ Safefree(HeKEY_hek(entry));
+ del_HE(entry);
}
+/*
+=for apidoc hv_clear
+
+Clears a hash, making it empty.
+
+=cut
+*/
+
void
-hv_clear(hv)
-HV *hv;
+Perl_hv_clear(pTHX_ HV *hv)
{
register XPVHV* xhv;
if (!hv)
return;
+
+ if(SvREADONLY(hv)) {
+ Perl_croak(aTHX_ "Attempt to clear a restricted hash");
+ }
+
xhv = (XPVHV*)SvANY(hv);
hfreeentries(hv);
- xhv->xhv_fill = 0;
- xhv->xhv_keys = 0;
- if (xhv->xhv_array)
- (void)memzero(xhv->xhv_array, (xhv->xhv_max + 1) * sizeof(HE*));
+ xhv->xhv_fill = 0; /* HvFILL(hv) = 0 */
+ xhv->xhv_keys = 0; /* HvKEYS(hv) = 0 */
+ xhv->xhv_placeholders = 0; /* HvPLACEHOLDERS(hv) = 0 */
+ if (xhv->xhv_array /* HvARRAY(hv) */)
+ (void)memzero(xhv->xhv_array /* HvARRAY(hv) */,
+ (xhv->xhv_max+1 /* HvMAX(hv)+1 */) * sizeof(HE*));
if (SvRMAGICAL(hv))
- mg_clear((SV*)hv);
+ mg_clear((SV*)hv);
+
+ HvHASKFLAGS_off(hv);
}
-static void
-hfreeentries(hv)
-HV *hv;
+STATIC void
+S_hfreeentries(pTHX_ HV *hv)
{
register HE **array;
- register HE *hent;
- register HE *ohent = Null(HE*);
+ register HE *entry;
+ register HE *oentry = Null(HE*);
I32 riter;
I32 max;
riter = 0;
max = HvMAX(hv);
array = HvARRAY(hv);
- hent = array[0];
+ entry = array[0];
for (;;) {
- if (hent) {
- ohent = hent;
- hent = hent->hent_next;
- he_free(ohent);
+ if (entry) {
+ oentry = entry;
+ entry = HeNEXT(entry);
+ hv_free_ent(hv, oentry);
}
- if (!hent) {
+ if (!entry) {
if (++riter > max)
break;
- hent = array[riter];
- }
+ entry = array[riter];
+ }
}
(void)hv_iterinit(hv);
}
+/*
+=for apidoc hv_undef
+
+Undefines the hash.
+
+=cut
+*/
+
void
-hv_undef(hv)
-HV *hv;
+Perl_hv_undef(pTHX_ HV *hv)
{
register XPVHV* xhv;
if (!hv)
return;
xhv = (XPVHV*)SvANY(hv);
hfreeentries(hv);
- Safefree(xhv->xhv_array);
+ Safefree(xhv->xhv_array /* HvARRAY(hv) */);
if (HvNAME(hv)) {
Safefree(HvNAME(hv));
HvNAME(hv) = 0;
}
- xhv->xhv_array = 0;
- xhv->xhv_max = 7; /* it's a normal associative array */
- xhv->xhv_fill = 0;
- xhv->xhv_keys = 0;
+ xhv->xhv_max = 7; /* HvMAX(hv) = 7 (it's a normal hash) */
+ xhv->xhv_array = 0; /* HvARRAY(hv) = 0 */
+ xhv->xhv_fill = 0; /* HvFILL(hv) = 0 */
+ xhv->xhv_keys = 0; /* HvKEYS(hv) = 0 */
+ xhv->xhv_placeholders = 0; /* HvPLACEHOLDERS(hv) = 0 */
if (SvRMAGICAL(hv))
- mg_clear((SV*)hv);
+ mg_clear((SV*)hv);
}
+/*
+=for apidoc hv_iterinit
+
+Prepares a starting point to traverse a hash table. Returns the number of
+keys in the hash (i.e. the same as C<HvKEYS(tb)>). The return value is
+currently only meaningful for hashes without tie magic.
+
+NOTE: Before version 5.004_65, C<hv_iterinit> used to return the number of
+hash buckets that happen to be in use. If you still need that esoteric
+value, you can get it through the macro C<HvFILL(tb)>.
+
+
+=cut
+*/
+
I32
-hv_iterinit(hv)
-HV *hv;
+Perl_hv_iterinit(pTHX_ HV *hv)
{
- register XPVHV* xhv = (XPVHV*)SvANY(hv);
- HE *entry = xhv->xhv_eiter;
- if (entry && entry->hent_klen < 0) /* was deleted earlier? */
- he_free(entry);
- xhv->xhv_riter = -1;
- xhv->xhv_eiter = Null(HE*);
- return xhv->xhv_fill;
+ register XPVHV* xhv;
+ HE *entry;
+
+ if (!hv)
+ Perl_croak(aTHX_ "Bad hash");
+ xhv = (XPVHV*)SvANY(hv);
+ entry = xhv->xhv_eiter; /* HvEITER(hv) */
+ if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */
+ HvLAZYDEL_off(hv);
+ hv_free_ent(hv, entry);
+ }
+ xhv->xhv_riter = -1; /* HvRITER(hv) = -1 */
+ xhv->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */
+ /* used to be xhv->xhv_fill before 5.004_65 */
+ return XHvTOTALKEYS(xhv);
+}
+/*
+=for apidoc hv_iternext
+
+Returns entries from a hash iterator. See C<hv_iterinit>.
+
+You may call C<hv_delete> or C<hv_delete_ent> on the hash entry that the
+iterator currently points to, without losing your place or invalidating your
+iterator. Note that in this case the current entry is deleted from the hash
+with your iterator holding the last reference to it. Your iterator is flagged
+to free the entry on the next call to C<hv_iternext>, so you must not discard
+your iterator immediately else the entry will leak - call C<hv_iternext> to
+trigger the resource deallocation.
+
+=cut
+*/
+
+HE *
+Perl_hv_iternext(pTHX_ HV *hv)
+{
+ return hv_iternext_flags(hv, 0);
}
+/*
+=for apidoc hv_iternext_flags
+
+Returns entries from a hash iterator. See C<hv_iterinit> and C<hv_iternext>.
+The C<flags> value will normally be zero; if HV_ITERNEXT_WANTPLACEHOLDERS is
+set the placeholders keys (for restricted hashes) will be returned in addition
+to normal keys. By default placeholders are automatically skipped over.
+Currently a placeholder is implemented with a value that is literally
+<&Perl_sv_undef> (a regular C<undef> value is a normal read-write SV for which
+C<!SvOK> is false). Note that the implementation of placeholders and
+restricted hashes may change, and the implementation currently is
+insufficiently abstracted for any change to be tidy.
+
+=cut
+*/
+
HE *
-hv_iternext(hv)
-HV *hv;
+Perl_hv_iternext_flags(pTHX_ HV *hv, I32 flags)
{
register XPVHV* xhv;
register HE *entry;
MAGIC* mg;
if (!hv)
- croak("Bad associative array");
+ Perl_croak(aTHX_ "Bad hash");
xhv = (XPVHV*)SvANY(hv);
- oldentry = entry = xhv->xhv_eiter;
+ oldentry = entry = xhv->xhv_eiter; /* HvEITER(hv) */
- if (SvRMAGICAL(hv) && (mg = mg_find((SV*)hv,'P'))) {
+ if ((mg = SvTIED_mg((SV*)hv, PERL_MAGIC_tied))) {
SV *key = sv_newmortal();
if (entry) {
- sv_usepvn(key, entry->hent_key, entry->hent_klen);
- entry->hent_key = 0;
+ sv_setsv(key, HeSVKEY_force(entry));
+ SvREFCNT_dec(HeSVKEY(entry)); /* get rid of previous key */
}
else {
- Newz(504,entry, 1, HE);
- xhv->xhv_eiter = entry;
+ char *k;
+ HEK *hek;
+
+ /* one HE per MAGICAL hash */
+ xhv->xhv_eiter = entry = new_HE(); /* HvEITER(hv) = new_HE() */
+ Zero(entry, 1, HE);
+ Newz(54, k, HEK_BASESIZE + sizeof(SV*), char);
+ hek = (HEK*)k;
+ HeKEY_hek(entry) = hek;
+ HeKLEN(entry) = HEf_SVKEY;
}
magic_nextpack((SV*) hv,mg,key);
- if (SvOK(key)) {
- STRLEN len;
- entry->hent_key = SvPV_force(key, len);
- entry->hent_klen = len;
- SvPOK_off(key);
- SvPVX(key) = 0;
- return entry;
- }
- if (entry->hent_val)
- SvREFCNT_dec(entry->hent_val);
- Safefree(entry);
- xhv->xhv_eiter = Null(HE*);
+ if (SvOK(key)) {
+ /* force key to stay around until next time */
+ HeSVKEY_set(entry, SvREFCNT_inc(key));
+ return entry; /* beware, hent_val is not set */
+ }
+ if (HeVAL(entry))
+ SvREFCNT_dec(HeVAL(entry));
+ Safefree(HeKEY_hek(entry));
+ del_HE(entry);
+ xhv->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */
return Null(HE*);
}
+#ifdef DYNAMIC_ENV_FETCH /* set up %ENV for iteration */
+ if (!entry && SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env))
+ prime_env_iter();
+#endif
- if (!xhv->xhv_array)
- entry = Null(HE*);
- else
- do {
- if (entry)
- entry = entry->hent_next;
- if (!entry) {
- ++xhv->xhv_riter;
- if (xhv->xhv_riter > xhv->xhv_max) {
- xhv->xhv_riter = -1;
- break;
- }
- entry = ((HE**)xhv->xhv_array)[xhv->xhv_riter];
+ if (!xhv->xhv_array /* !HvARRAY(hv) */)
+ Newz(506, xhv->xhv_array /* HvARRAY(hv) */,
+ PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */),
+ char);
+ if (entry)
+ {
+ entry = HeNEXT(entry);
+ if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) {
+ /*
+ * Skip past any placeholders -- don't want to include them in
+ * any iteration.
+ */
+ while (entry && HeVAL(entry) == &PL_sv_undef) {
+ entry = HeNEXT(entry);
+ }
}
- } while (!entry);
+ }
+ while (!entry) {
+ xhv->xhv_riter++; /* HvRITER(hv)++ */
+ if (xhv->xhv_riter > (I32)xhv->xhv_max /* HvRITER(hv) > HvMAX(hv) */) {
+ xhv->xhv_riter = -1; /* HvRITER(hv) = -1 */
+ break;
+ }
+ /* entry = (HvARRAY(hv))[HvRITER(hv)]; */
+ entry = ((HE**)xhv->xhv_array)[xhv->xhv_riter];
+
+ if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) {
+ /* if we have an entry, but it's a placeholder, don't count it */
+ if (entry && HeVAL(entry) == &PL_sv_undef)
+ entry = 0;
+ }
+ }
- if (oldentry && oldentry->hent_klen < 0) /* was deleted earlier? */
- he_free(oldentry);
+ if (oldentry && HvLAZYDEL(hv)) { /* was deleted earlier? */
+ HvLAZYDEL_off(hv);
+ hv_free_ent(hv, oldentry);
+ }
- xhv->xhv_eiter = entry;
+ xhv->xhv_eiter = entry; /* HvEITER(hv) = entry */
return entry;
}
+/*
+=for apidoc hv_iterkey
+
+Returns the key from the current position of the hash iterator. See
+C<hv_iterinit>.
+
+=cut
+*/
+
char *
-hv_iterkey(entry,retlen)
-register HE *entry;
-I32 *retlen;
+Perl_hv_iterkey(pTHX_ register HE *entry, I32 *retlen)
+{
+ if (HeKLEN(entry) == HEf_SVKEY) {
+ STRLEN len;
+ char *p = SvPV(HeKEY_sv(entry), len);
+ *retlen = len;
+ return p;
+ }
+ else {
+ *retlen = HeKLEN(entry);
+ return HeKEY(entry);
+ }
+}
+
+/* unlike hv_iterval(), this always returns a mortal copy of the key */
+/*
+=for apidoc hv_iterkeysv
+
+Returns the key as an C<SV*> from the current position of the hash
+iterator. The return value will always be a mortal copy of the key. Also
+see C<hv_iterinit>.
+
+=cut
+*/
+
+SV *
+Perl_hv_iterkeysv(pTHX_ register HE *entry)
{
- *retlen = entry->hent_klen;
- return entry->hent_key;
+ if (HeKLEN(entry) != HEf_SVKEY) {
+ HEK *hek = HeKEY_hek(entry);
+ int flags = HEK_FLAGS(hek);
+ SV *sv;
+
+ if (flags & HVhek_WASUTF8) {
+ /* Trouble :-)
+ Andreas would like keys he put in as utf8 to come back as utf8
+ */
+ STRLEN utf8_len = HEK_LEN(hek);
+ U8 *as_utf8 = bytes_to_utf8 ((U8*)HEK_KEY(hek), &utf8_len);
+
+ sv = newSVpvn ((char*)as_utf8, utf8_len);
+ SvUTF8_on (sv);
+ Safefree (as_utf8); /* bytes_to_utf8() allocates a new string */
+ } else {
+ sv = newSVpvn_share(HEK_KEY(hek),
+ (HEK_UTF8(hek) ? -HEK_LEN(hek) : HEK_LEN(hek)),
+ HEK_HASH(hek));
+ }
+ return sv_2mortal(sv);
+ }
+ return sv_mortalcopy(HeKEY_sv(entry));
}
+/*
+=for apidoc hv_iterval
+
+Returns the value from the current position of the hash iterator. See
+C<hv_iterkey>.
+
+=cut
+*/
+
SV *
-hv_iterval(hv,entry)
-HV *hv;
-register HE *entry;
+Perl_hv_iterval(pTHX_ HV *hv, register HE *entry)
{
if (SvRMAGICAL(hv)) {
- if (mg_find((SV*)hv,'P')) {
+ if (mg_find((SV*)hv, PERL_MAGIC_tied)) {
SV* sv = sv_newmortal();
- mg_copy((SV*)hv, sv, entry->hent_key, entry->hent_klen);
+ if (HeKLEN(entry) == HEf_SVKEY)
+ mg_copy((SV*)hv, sv, (char*)HeKEY_sv(entry), HEf_SVKEY);
+ else mg_copy((SV*)hv, sv, HeKEY(entry), HeKLEN(entry));
return sv;
}
}
- return entry->hent_val;
+ return HeVAL(entry);
}
+/*
+=for apidoc hv_iternextsv
+
+Performs an C<hv_iternext>, C<hv_iterkey>, and C<hv_iterval> in one
+operation.
+
+=cut
+*/
+
SV *
-hv_iternextsv(hv, key, retlen)
- HV *hv;
- char **key;
- I32 *retlen;
+Perl_hv_iternextsv(pTHX_ HV *hv, char **key, I32 *retlen)
{
HE *he;
- if ( (he = hv_iternext(hv)) == NULL)
+ if ( (he = hv_iternext_flags(hv, 0)) == NULL)
return NULL;
*key = hv_iterkey(he, retlen);
return hv_iterval(hv, he);
}
+/*
+=for apidoc hv_magic
+
+Adds magic to a hash. See C<sv_magic>.
+
+=cut
+*/
+
void
-hv_magic(hv, gv, how)
-HV* hv;
-GV* gv;
-int how;
+Perl_hv_magic(pTHX_ HV *hv, GV *gv, int how)
{
sv_magic((SV*)hv, (SV*)gv, how, Nullch, 0);
}
+
+#if 0 /* use the macro from hv.h instead */
+
+char*
+Perl_sharepvn(pTHX_ const char *sv, I32 len, U32 hash)
+{
+ return HEK_KEY(share_hek(sv, len, hash));
+}
+
+#endif
+
+/* possibly free a shared string if no one has access to it
+ * len and hash must both be valid for str.
+ */
+void
+Perl_unsharepvn(pTHX_ const char *str, I32 len, U32 hash)
+{
+ unshare_hek_or_pvn (NULL, str, len, hash);
+}
+
+
+void
+Perl_unshare_hek(pTHX_ HEK *hek)
+{
+ unshare_hek_or_pvn(hek, NULL, 0, 0);
+}
+
+/* possibly free a shared string if no one has access to it
+ hek if non-NULL takes priority over the other 3, else str, len and hash
+ are used. If so, len and hash must both be valid for str.
+ */
+STATIC void
+S_unshare_hek_or_pvn(pTHX_ HEK *hek, const char *str, I32 len, U32 hash)
+{
+ register XPVHV* xhv;
+ register HE *entry;
+ register HE **oentry;
+ register I32 i = 1;
+ I32 found = 0;
+ bool is_utf8 = FALSE;
+ int k_flags = 0;
+ const char *save = str;
+
+ if (hek) {
+ hash = HEK_HASH(hek);
+ } else if (len < 0) {
+ STRLEN tmplen = -len;
+ is_utf8 = TRUE;
+ /* See the note in hv_fetch(). --jhi */
+ str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8);
+ len = tmplen;
+ if (is_utf8)
+ k_flags = HVhek_UTF8;
+ if (str != save)
+ k_flags |= HVhek_WASUTF8 | HVhek_FREEKEY;
+ }
+
+ /* what follows is the moral equivalent of:
+ if ((Svp = hv_fetch(PL_strtab, tmpsv, FALSE, hash))) {
+ if (--*Svp == Nullsv)
+ hv_delete(PL_strtab, str, len, G_DISCARD, hash);
+ } */
+ xhv = (XPVHV*)SvANY(PL_strtab);
+ /* assert(xhv_array != 0) */
+ LOCK_STRTAB_MUTEX;
+ /* oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
+ oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
+ if (hek) {
+ for (entry = *oentry; entry; i=0, oentry = &HeNEXT(entry), entry = *oentry) {
+ if (HeKEY_hek(entry) != hek)
+ continue;
+ found = 1;
+ break;
+ }
+ } else {
+ int flags_masked = k_flags & HVhek_MASK;
+ for (entry = *oentry; entry; i=0, oentry = &HeNEXT(entry), entry = *oentry) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
+ continue;
+ if (HeKLEN(entry) != len)
+ continue;
+ if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */
+ continue;
+ if (HeKFLAGS(entry) != flags_masked)
+ continue;
+ found = 1;
+ break;
+ }
+ }
+
+ if (found) {
+ if (--HeVAL(entry) == Nullsv) {
+ *oentry = HeNEXT(entry);
+ if (i && !*oentry)
+ xhv->xhv_fill--; /* HvFILL(hv)-- */
+ Safefree(HeKEY_hek(entry));
+ del_HE(entry);
+ xhv->xhv_keys--; /* HvKEYS(hv)-- */
+ }
+ }
+
+ UNLOCK_STRTAB_MUTEX;
+ if (!found && ckWARN_d(WARN_INTERNAL))
+ Perl_warner(aTHX_ packWARN(WARN_INTERNAL),
+ "Attempt to free non-existent shared string '%s'%s",
+ hek ? HEK_KEY(hek) : str,
+ (k_flags & HVhek_UTF8) ? " (utf8)" : "");
+ if (k_flags & HVhek_FREEKEY)
+ Safefree(str);
+}
+
+/* get a (constant) string ptr from the global string table
+ * string will get added if it is not already there.
+ * len and hash must both be valid for str.
+ */
+HEK *
+Perl_share_hek(pTHX_ const char *str, I32 len, register U32 hash)
+{
+ bool is_utf8 = FALSE;
+ int flags = 0;
+ const char *save = str;
+
+ if (len < 0) {
+ STRLEN tmplen = -len;
+ is_utf8 = TRUE;
+ /* See the note in hv_fetch(). --jhi */
+ str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8);
+ len = tmplen;
+ /* If we were able to downgrade here, then than means that we were passed
+ in a key which only had chars 0-255, but was utf8 encoded. */
+ if (is_utf8)
+ flags = HVhek_UTF8;
+ /* If we found we were able to downgrade the string to bytes, then
+ we should flag that it needs upgrading on keys or each. Also flag
+ that we need share_hek_flags to free the string. */
+ if (str != save)
+ flags |= HVhek_WASUTF8 | HVhek_FREEKEY;
+ }
+
+ return share_hek_flags (str, len, hash, flags);
+}
+
+STATIC HEK *
+S_share_hek_flags(pTHX_ const char *str, I32 len, register U32 hash, int flags)
+{
+ register XPVHV* xhv;
+ register HE *entry;
+ register HE **oentry;
+ register I32 i = 1;
+ I32 found = 0;
+ int flags_masked = flags & HVhek_MASK;
+
+ /* what follows is the moral equivalent of:
+
+ if (!(Svp = hv_fetch(PL_strtab, str, len, FALSE)))
+ hv_store(PL_strtab, str, len, Nullsv, hash);
+ */
+ xhv = (XPVHV*)SvANY(PL_strtab);
+ /* assert(xhv_array != 0) */
+ LOCK_STRTAB_MUTEX;
+ /* oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; */
+ oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
+ for (entry = *oentry; entry; i=0, entry = HeNEXT(entry)) {
+ if (HeHASH(entry) != hash) /* strings can't be equal */
+ continue;
+ if (HeKLEN(entry) != len)
+ continue;
+ if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */
+ continue;
+ if (HeKFLAGS(entry) != flags_masked)
+ continue;
+ found = 1;
+ break;
+ }
+ if (!found) {
+ entry = new_HE();
+ HeKEY_hek(entry) = save_hek_flags(str, len, hash, flags);
+ HeVAL(entry) = Nullsv;
+ HeNEXT(entry) = *oentry;
+ *oentry = entry;
+ xhv->xhv_keys++; /* HvKEYS(hv)++ */
+ if (i) { /* initial entry? */
+ xhv->xhv_fill++; /* HvFILL(hv)++ */
+ if (xhv->xhv_keys > (IV)xhv->xhv_max /* HvKEYS(hv) > HvMAX(hv) */)
+ hsplit(PL_strtab);
+ }
+ }
+
+ ++HeVAL(entry); /* use value slot as REFCNT */
+ UNLOCK_STRTAB_MUTEX;
+
+ if (flags & HVhek_FREEKEY)
+ Safefree(str);
+
+ return HeKEY_hek(entry);
+}