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freebsd-src/contrib/perl5/hv.c

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/* hv.c
*
* Copyright (c) 1991-1997, 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
*/
#include "EXTERN.h"
#include "perl.h"
static void hv_magic_check _((HV *hv, bool *needs_copy, bool *needs_store));
#ifndef PERL_OBJECT
static void hsplit _((HV *hv));
static void hfreeentries _((HV *hv));
static HE* more_he _((void));
#endif
#if defined(STRANGE_MALLOC) || defined(MYMALLOC)
# define ARRAY_ALLOC_BYTES(size) ( (size)*sizeof(HE*) )
#else
# define MALLOC_OVERHEAD 16
# define ARRAY_ALLOC_BYTES(size) ( (size)*sizeof(HE*)*2 - MALLOC_OVERHEAD )
#endif
STATIC HE*
new_he(void)
{
HE* he;
if (PL_he_root) {
he = PL_he_root;
PL_he_root = HeNEXT(he);
return he;
}
return more_he();
}
STATIC void
del_he(HE *p)
{
HeNEXT(p) = (HE*)PL_he_root;
PL_he_root = p;
}
STATIC HE*
more_he(void)
{
register HE* he;
register HE* heend;
New(54, PL_he_root, 1008/sizeof(HE), HE);
he = PL_he_root;
heend = &he[1008 / sizeof(HE) - 1];
while (he < heend) {
HeNEXT(he) = (HE*)(he + 1);
he++;
}
HeNEXT(he) = 0;
return new_he();
}
STATIC HEK *
save_hek(char *str, I32 len, U32 hash)
{
char *k;
register HEK *hek;
New(54, k, HEK_BASESIZE + len + 1, char);
hek = (HEK*)k;
Copy(str, HEK_KEY(hek), len, char);
*(HEK_KEY(hek) + len) = '\0';
HEK_LEN(hek) = len;
HEK_HASH(hek) = hash;
return hek;
}
void
unshare_hek(HEK *hek)
{
unsharepvn(HEK_KEY(hek),HEK_LEN(hek),HEK_HASH(hek));
}
/* (klen == HEf_SVKEY) is special for MAGICAL hv entries, meaning key slot
* contains an SV* */
SV**
hv_fetch(HV *hv, char *key, U32 klen, I32 lval)
{
register XPVHV* xhv;
register U32 hash;
register HE *entry;
SV *sv;
if (!hv)
return 0;
if (SvRMAGICAL(hv)) {
if (mg_find((SV*)hv,'P')) {
dTHR;
sv = sv_newmortal();
mg_copy((SV*)hv, sv, key, klen);
PL_hv_fetch_sv = sv;
return &PL_hv_fetch_sv;
}
#ifdef ENV_IS_CASELESS
else if (mg_find((SV*)hv,'E')) {
U32 i;
for (i = 0; i < klen; ++i)
if (isLOWER(key[i])) {
char *nkey = strupr(SvPVX(sv_2mortal(newSVpv(key,klen))));
SV **ret = hv_fetch(hv, nkey, klen, 0);
if (!ret && lval)
ret = hv_store(hv, key, klen, NEWSV(61,0), 0);
return ret;
}
}
#endif
}
xhv = (XPVHV*)SvANY(hv);
if (!xhv->xhv_array) {
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))
#endif
)
Newz(503,xhv->xhv_array, ARRAY_ALLOC_BYTES(xhv->xhv_max + 1), char);
else
return 0;
}
PERL_HASH(hash, key, klen);
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) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
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 ((gotenv = PerlEnv_getenv(key)) != Nullch) {
sv = newSVpv(gotenv,strlen(gotenv));
SvTAINTED_on(sv);
return hv_store(hv,key,klen,sv,hash);
}
}
#endif
if (lval) { /* gonna assign to this, so it better be there */
sv = NEWSV(61,0);
return hv_store(hv,key,klen,sv,hash);
}
return 0;
}
/* returns a HE * structure with the all fields set */
/* note that hent_val will be a mortal sv for MAGICAL hashes */
HE *
hv_fetch_ent(HV *hv, SV *keysv, I32 lval, register U32 hash)
{
register XPVHV* xhv;
register char *key;
STRLEN klen;
register HE *entry;
SV *sv;
if (!hv)
return 0;
if (SvRMAGICAL(hv)) {
if (mg_find((SV*)hv,'P')) {
dTHR;
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,'E')) {
U32 i;
key = SvPV(keysv, klen);
for (i = 0; i < klen; ++i)
if (isLOWER(key[i])) {
SV *nkeysv = sv_2mortal(newSVpv(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) {
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))
#endif
)
Newz(503,xhv->xhv_array, ARRAY_ALLOC_BYTES(xhv->xhv_max + 1), char);
else
return 0;
}
key = SvPV(keysv, klen);
if (!hash)
PERL_HASH(hash, key, klen);
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) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
return 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 ((gotenv = PerlEnv_getenv(key)) != Nullch) {
sv = newSVpv(gotenv,strlen(gotenv));
SvTAINTED_on(sv);
return hv_store_ent(hv,keysv,sv,hash);
}
}
#endif
if (lval) { /* gonna assign to this, so it better be there */
sv = NEWSV(61,0);
return hv_store_ent(hv,keysv,sv,hash);
}
return 0;
}
static void
hv_magic_check (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 'P':
case 'S':
*needs_store = FALSE;
}
}
mg = mg->mg_moremagic;
}
}
SV**
hv_store(HV *hv, char *key, U32 klen, SV *val, register U32 hash)
{
register XPVHV* xhv;
register I32 i;
register HE *entry;
register HE **oentry;
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) {
mg_copy((SV*)hv, val, key, klen);
if (!xhv->xhv_array && !needs_store)
return 0;
#ifdef ENV_IS_CASELESS
else if (mg_find((SV*)hv,'E')) {
SV *sv = sv_2mortal(newSVpv(key,klen));
key = strupr(SvPVX(sv));
hash = 0;
}
#endif
}
}
if (!hash)
PERL_HASH(hash, key, klen);
if (!xhv->xhv_array)
Newz(505, xhv->xhv_array, ARRAY_ALLOC_BYTES(xhv->xhv_max + 1), char);
oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
i = 1;
for (entry = *oentry; entry; i=0, entry = HeNEXT(entry)) {
if (HeHASH(entry) != hash) /* strings can't be equal */
continue;
if (HeKLEN(entry) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
SvREFCNT_dec(HeVAL(entry));
HeVAL(entry) = val;
return &HeVAL(entry);
}
entry = new_he();
if (HvSHAREKEYS(hv))
HeKEY_hek(entry) = share_hek(key, klen, hash);
else /* gotta do the real thing */
HeKEY_hek(entry) = save_hek(key, klen, hash);
HeVAL(entry) = val;
HeNEXT(entry) = *oentry;
*oentry = entry;
xhv->xhv_keys++;
if (i) { /* initial entry? */
++xhv->xhv_fill;
if (xhv->xhv_keys > xhv->xhv_max)
hsplit(hv);
}
return &HeVAL(entry);
}
HE *
hv_store_ent(HV *hv, SV *keysv, SV *val, register U32 hash)
{
register XPVHV* xhv;
register char *key;
STRLEN klen;
register I32 i;
register HE *entry;
register HE **oentry;
if (!hv)
return 0;
xhv = (XPVHV*)SvANY(hv);
if (SvMAGICAL(hv)) {
dTHR;
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 && !needs_store)
return Nullhe;
#ifdef ENV_IS_CASELESS
else if (mg_find((SV*)hv,'E')) {
key = SvPV(keysv, klen);
keysv = sv_2mortal(newSVpv(key,klen));
(void)strupr(SvPVX(keysv));
hash = 0;
}
#endif
}
}
key = SvPV(keysv, klen);
if (!hash)
PERL_HASH(hash, key, klen);
if (!xhv->xhv_array)
Newz(505, xhv->xhv_array, ARRAY_ALLOC_BYTES(xhv->xhv_max + 1), char);
oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
i = 1;
for (entry = *oentry; entry; i=0, entry = HeNEXT(entry)) {
if (HeHASH(entry) != hash) /* strings can't be equal */
continue;
if (HeKLEN(entry) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
SvREFCNT_dec(HeVAL(entry));
HeVAL(entry) = val;
return entry;
}
entry = new_he();
if (HvSHAREKEYS(hv))
HeKEY_hek(entry) = share_hek(key, klen, hash);
else /* gotta do the real thing */
HeKEY_hek(entry) = save_hek(key, klen, hash);
HeVAL(entry) = val;
HeNEXT(entry) = *oentry;
*oentry = entry;
xhv->xhv_keys++;
if (i) { /* initial entry? */
++xhv->xhv_fill;
if (xhv->xhv_keys > xhv->xhv_max)
hsplit(hv);
}
return entry;
}
SV *
hv_delete(HV *hv, char *key, U32 klen, I32 flags)
{
register XPVHV* xhv;
register I32 i;
register U32 hash;
register HE *entry;
register HE **oentry;
SV **svp;
SV *sv;
if (!hv)
return Nullsv;
if (SvRMAGICAL(hv)) {
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, 'p')) {
sv_unmagic(sv, 'p'); /* No longer an element */
return sv;
}
return Nullsv; /* element cannot be deleted */
}
#ifdef ENV_IS_CASELESS
else if (mg_find((SV*)hv,'E')) {
sv = sv_2mortal(newSVpv(key,klen));
key = strupr(SvPVX(sv));
}
#endif
}
}
xhv = (XPVHV*)SvANY(hv);
if (!xhv->xhv_array)
return Nullsv;
PERL_HASH(hash, key, klen);
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) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
*oentry = HeNEXT(entry);
if (i && !*oentry)
xhv->xhv_fill--;
if (flags & G_DISCARD)
sv = Nullsv;
else
sv = sv_mortalcopy(HeVAL(entry));
if (entry == xhv->xhv_eiter)
HvLAZYDEL_on(hv);
else
hv_free_ent(hv, entry);
--xhv->xhv_keys;
return sv;
}
return Nullsv;
}
SV *
hv_delete_ent(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;
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, 'p')) {
sv_unmagic(sv, 'p'); /* No longer an element */
return sv;
}
return Nullsv; /* element cannot be deleted */
}
#ifdef ENV_IS_CASELESS
else if (mg_find((SV*)hv,'E')) {
key = SvPV(keysv, klen);
keysv = sv_2mortal(newSVpv(key,klen));
(void)strupr(SvPVX(keysv));
hash = 0;
}
#endif
}
}
xhv = (XPVHV*)SvANY(hv);
if (!xhv->xhv_array)
return Nullsv;
key = SvPV(keysv, klen);
if (!hash)
PERL_HASH(hash, key, klen);
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) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
*oentry = HeNEXT(entry);
if (i && !*oentry)
xhv->xhv_fill--;
if (flags & G_DISCARD)
sv = Nullsv;
else
sv = sv_mortalcopy(HeVAL(entry));
if (entry == xhv->xhv_eiter)
HvLAZYDEL_on(hv);
else
hv_free_ent(hv, entry);
--xhv->xhv_keys;
return sv;
}
return Nullsv;
}
bool
hv_exists(HV *hv, char *key, U32 klen)
{
register XPVHV* xhv;
register U32 hash;
register HE *entry;
SV *sv;
if (!hv)
return 0;
if (SvRMAGICAL(hv)) {
if (mg_find((SV*)hv,'P')) {
dTHR;
sv = sv_newmortal();
mg_copy((SV*)hv, sv, key, klen);
magic_existspack(sv, mg_find(sv, 'p'));
return SvTRUE(sv);
}
#ifdef ENV_IS_CASELESS
else if (mg_find((SV*)hv,'E')) {
sv = sv_2mortal(newSVpv(key,klen));
key = strupr(SvPVX(sv));
}
#endif
}
xhv = (XPVHV*)SvANY(hv);
if (!xhv->xhv_array)
return 0;
PERL_HASH(hash, key, klen);
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) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
return TRUE;
}
return FALSE;
}
bool
hv_exists_ent(HV *hv, SV *keysv, U32 hash)
{
register XPVHV* xhv;
register char *key;
STRLEN klen;
register HE *entry;
SV *sv;
if (!hv)
return 0;
if (SvRMAGICAL(hv)) {
if (mg_find((SV*)hv,'P')) {
dTHR; /* just for SvTRUE */
sv = sv_newmortal();
keysv = sv_2mortal(newSVsv(keysv));
mg_copy((SV*)hv, sv, (char*)keysv, HEf_SVKEY);
magic_existspack(sv, mg_find(sv, 'p'));
return SvTRUE(sv);
}
#ifdef ENV_IS_CASELESS
else if (mg_find((SV*)hv,'E')) {
key = SvPV(keysv, klen);
keysv = sv_2mortal(newSVpv(key,klen));
(void)strupr(SvPVX(keysv));
hash = 0;
}
#endif
}
xhv = (XPVHV*)SvANY(hv);
if (!xhv->xhv_array)
return 0;
key = SvPV(keysv, klen);
if (!hash)
PERL_HASH(hash, key, klen);
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) != klen)
continue;
if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
return TRUE;
}
return FALSE;
}
STATIC void
hsplit(HV *hv)
{
register XPVHV* xhv = (XPVHV*)SvANY(hv);
I32 oldsize = (I32) xhv->xhv_max + 1; /* sic(k) */
register I32 newsize = oldsize * 2;
register I32 i;
register char *a = xhv->xhv_array;
register HE **aep;
register HE **bep;
register HE *entry;
register HE **oentry;
PL_nomemok = TRUE;
#if defined(STRANGE_MALLOC) || defined(MYMALLOC)
Renew(a, ARRAY_ALLOC_BYTES(newsize), char);
if (!a) {
PL_nomemok = FALSE;
return;
}
#else
#define MALLOC_OVERHEAD 16
New(2, a, ARRAY_ALLOC_BYTES(newsize), char);
if (!a) {
PL_nomemok = FALSE;
return;
}
Copy(xhv->xhv_array, a, oldsize * sizeof(HE*), char);
if (oldsize >= 64) {
offer_nice_chunk(xhv->xhv_array, ARRAY_ALLOC_BYTES(oldsize));
}
else
Safefree(xhv->xhv_array);
#endif
PL_nomemok = FALSE;
Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/
xhv->xhv_max = --newsize;
xhv->xhv_array = 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) != i) {
*oentry = HeNEXT(entry);
HeNEXT(entry) = *bep;
if (!*bep)
xhv->xhv_fill++;
*bep = entry;
continue;
}
else
oentry = &HeNEXT(entry);
}
if (!*aep) /* everything moved */
xhv->xhv_fill--;
}
}
void
hv_ksplit(HV *hv, IV newmax)
{
register XPVHV* xhv = (XPVHV*)SvANY(hv);
I32 oldsize = (I32) xhv->xhv_max + 1; /* sic(k) */
register I32 newsize;
register I32 i;
register I32 j;
register char *a;
register HE **aep;
register HE *entry;
register HE **oentry;
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;
if (a) {
PL_nomemok = TRUE;
#if defined(STRANGE_MALLOC) || defined(MYMALLOC)
Renew(a, ARRAY_ALLOC_BYTES(newsize), char);
if (!a) {
PL_nomemok = FALSE;
return;
}
#else
New(2, a, ARRAY_ALLOC_BYTES(newsize), char);
if (!a) {
PL_nomemok = FALSE;
return;
}
Copy(xhv->xhv_array, a, oldsize * sizeof(HE*), char);
if (oldsize >= 64) {
offer_nice_chunk(xhv->xhv_array, ARRAY_ALLOC_BYTES(oldsize));
}
else
Safefree(xhv->xhv_array);
#endif
PL_nomemok = FALSE;
Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/
}
else {
Newz(0, a, ARRAY_ALLOC_BYTES(newsize), char);
}
xhv->xhv_max = --newsize;
xhv->xhv_array = a;
if (!xhv->xhv_fill) /* 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++;
aep[j] = entry;
continue;
}
else
oentry = &HeNEXT(entry);
}
if (!*aep) /* everything moved */
xhv->xhv_fill--;
}
}
HV *
newHV(void)
{
register HV *hv;
register XPVHV* xhv;
hv = (HV*)NEWSV(502,0);
sv_upgrade((SV *)hv, SVt_PVHV);
xhv = (XPVHV*)SvANY(hv);
SvPOK_off(hv);
SvNOK_off(hv);
#ifndef NODEFAULT_SHAREKEYS
HvSHAREKEYS_on(hv); /* key-sharing on by default */
#endif
xhv->xhv_max = 7; /* start with 8 buckets */
xhv->xhv_fill = 0;
xhv->xhv_pmroot = 0;
(void)hv_iterinit(hv); /* so each() will start off right */
return hv;
}
HV *
newHVhv(HV *ohv)
{
register HV *hv;
register XPVHV* xhv;
STRLEN hv_max = ohv ? HvMAX(ohv) : 0;
STRLEN hv_fill = ohv ? HvFILL(ohv) : 0;
hv = newHV();
while (hv_max && hv_max + 1 >= hv_fill * 2)
hv_max = hv_max / 2; /* Is always 2^n-1 */
((XPVHV*)SvANY(hv))->xhv_max = hv_max;
if (!hv_fill)
return hv;
#if 0
if (!SvRMAGICAL(ohv) || !mg_find((SV*)ohv,'P')) {
/* Quick way ???*/
}
else
#endif
{
HE *entry;
I32 hv_riter = HvRITER(ohv); /* current root of iterator */
HE *hv_eiter = HvEITER(ohv); /* current entry of iterator */
/* Slow way */
hv_iterinit(hv);
while (entry = hv_iternext(ohv)) {
hv_store(hv, HeKEY(entry), HeKLEN(entry),
SvREFCNT_inc(HeVAL(entry)), HeHASH(entry));
}
HvRITER(ohv) = hv_riter;
HvEITER(ohv) = hv_eiter;
}
return hv;
}
void
hv_free_ent(HV *hv, register HE *entry)
{
SV *val;
if (!entry)
return;
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
hv_delayfree_ent(HV *hv, register HE *entry)
{
if (!entry)
return;
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);
}
void
hv_clear(HV *hv)
{
register XPVHV* xhv;
if (!hv)
return;
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*));
if (SvRMAGICAL(hv))
mg_clear((SV*)hv);
}
STATIC void
hfreeentries(HV *hv)
{
register HE **array;
register HE *entry;
register HE *oentry = Null(HE*);
I32 riter;
I32 max;
if (!hv)
return;
if (!HvARRAY(hv))
return;
riter = 0;
max = HvMAX(hv);
array = HvARRAY(hv);
entry = array[0];
for (;;) {
if (entry) {
oentry = entry;
entry = HeNEXT(entry);
hv_free_ent(hv, oentry);
}
if (!entry) {
if (++riter > max)
break;
entry = array[riter];
}
}
(void)hv_iterinit(hv);
}
void
hv_undef(HV *hv)
{
register XPVHV* xhv;
if (!hv)
return;
xhv = (XPVHV*)SvANY(hv);
hfreeentries(hv);
Safefree(xhv->xhv_array);
if (HvNAME(hv)) {
Safefree(HvNAME(hv));
HvNAME(hv) = 0;
}
xhv->xhv_array = 0;
xhv->xhv_max = 7; /* it's a normal hash */
xhv->xhv_fill = 0;
xhv->xhv_keys = 0;
if (SvRMAGICAL(hv))
mg_clear((SV*)hv);
}
I32
hv_iterinit(HV *hv)
{
register XPVHV* xhv;
HE *entry;
if (!hv)
croak("Bad hash");
xhv = (XPVHV*)SvANY(hv);
entry = xhv->xhv_eiter;
#ifdef DYNAMIC_ENV_FETCH /* set up %ENV for iteration */
if (HvNAME(hv) && strEQ(HvNAME(hv), ENV_HV_NAME))
prime_env_iter();
#endif
if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */
HvLAZYDEL_off(hv);
hv_free_ent(hv, entry);
}
xhv->xhv_riter = -1;
xhv->xhv_eiter = Null(HE*);
return xhv->xhv_keys; /* used to be xhv->xhv_fill before 5.004_65 */
}
HE *
hv_iternext(HV *hv)
{
register XPVHV* xhv;
register HE *entry;
HE *oldentry;
MAGIC* mg;
if (!hv)
croak("Bad hash");
xhv = (XPVHV*)SvANY(hv);
oldentry = entry = xhv->xhv_eiter;
if (SvRMAGICAL(hv) && (mg = mg_find((SV*)hv,'P'))) {
SV *key = sv_newmortal();
if (entry) {
sv_setsv(key, HeSVKEY_force(entry));
SvREFCNT_dec(HeSVKEY(entry)); /* get rid of previous key */
}
else {
char *k;
HEK *hek;
xhv->xhv_eiter = entry = new_he(); /* one HE per MAGICAL hash */
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)) {
/* 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*);
return Null(HE*);
}
if (!xhv->xhv_array)
Newz(506,xhv->xhv_array, ARRAY_ALLOC_BYTES(xhv->xhv_max + 1), char);
if (entry)
entry = HeNEXT(entry);
while (!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 (oldentry && HvLAZYDEL(hv)) { /* was deleted earlier? */
HvLAZYDEL_off(hv);
hv_free_ent(hv, oldentry);
}
xhv->xhv_eiter = entry;
return entry;
}
char *
hv_iterkey(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 */
SV *
hv_iterkeysv(register HE *entry)
{
if (HeKLEN(entry) == HEf_SVKEY)
return sv_mortalcopy(HeKEY_sv(entry));
else
return sv_2mortal(newSVpv((HeKLEN(entry) ? HeKEY(entry) : ""),
HeKLEN(entry)));
}
SV *
hv_iterval(HV *hv, register HE *entry)
{
if (SvRMAGICAL(hv)) {
if (mg_find((SV*)hv,'P')) {
SV* sv = sv_newmortal();
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 HeVAL(entry);
}
SV *
hv_iternextsv(HV *hv, char **key, I32 *retlen)
{
HE *he;
if ( (he = hv_iternext(hv)) == NULL)
return NULL;
*key = hv_iterkey(he, retlen);
return hv_iterval(hv, he);
}
void
hv_magic(HV *hv, GV *gv, int how)
{
sv_magic((SV*)hv, (SV*)gv, how, Nullch, 0);
}
char*
sharepvn(char *sv, I32 len, U32 hash)
{
return HEK_KEY(share_hek(sv, len, hash));
}
/* possibly free a shared string if no one has access to it
* len and hash must both be valid for str.
*/
void
unsharepvn(char *str, I32 len, U32 hash)
{
register XPVHV* xhv;
register HE *entry;
register HE **oentry;
register I32 i = 1;
I32 found = 0;
/* 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) */
oentry = &((HE**)xhv->xhv_array)[hash & (I32) xhv->xhv_max];
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 (memNE(HeKEY(entry),str,len)) /* is this it? */
continue;
found = 1;
if (--HeVAL(entry) == Nullsv) {
*oentry = HeNEXT(entry);
if (i && !*oentry)
xhv->xhv_fill--;
Safefree(HeKEY_hek(entry));
del_he(entry);
--xhv->xhv_keys;
}
break;
}
if (!found)
warn("Attempt to free non-existent shared string");
}
/* 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 *
share_hek(char *str, I32 len, register U32 hash)
{
register XPVHV* xhv;
register HE *entry;
register HE **oentry;
register I32 i = 1;
I32 found = 0;
/* 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) */
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 (memNE(HeKEY(entry),str,len)) /* is this it? */
continue;
found = 1;
break;
}
if (!found) {
entry = new_he();
HeKEY_hek(entry) = save_hek(str, len, hash);
HeVAL(entry) = Nullsv;
HeNEXT(entry) = *oentry;
*oentry = entry;
xhv->xhv_keys++;
if (i) { /* initial entry? */
++xhv->xhv_fill;
if (xhv->xhv_keys > xhv->xhv_max)
hsplit(PL_strtab);
}
}
++HeVAL(entry); /* use value slot as REFCNT */
return HeKEY_hek(entry);
}
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