/*
=head1 Hash Manipulation Functions
-
A HV structure represents a Perl hash. It consists mainly of an array
of pointers, each of which points to a linked list of HE structures. The
array is indexed by the hash function of the key, so each linked list
STATIC HE*
S_new_he(pTHX)
{
- dVAR;
HE* he;
void ** const root = &PL_body_roots[HE_SVSLOT];
HEK *hek;
PERL_ARGS_ASSERT_SAVE_HEK_FLAGS;
-
- Newx(k, HEK_BASESIZE + len + 2, char);
+ Newx(k, HEK_BASESIZE + len + 1, char);
hek = (HEK*)k;
Copy(str, HEK_KEY(hek), len, char);
HEK_KEY(hek)[len] = 0;
void
Perl_free_tied_hv_pool(pTHX)
{
- dVAR;
HE *he = PL_hv_fetch_ent_mh;
while (he) {
HE * const ohe = he;
Perl will compute it.
The return value will be
-NULL if the operation failed or if the value did not need to be actually
+C<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. Effectively
-a successful hv_store takes ownership of one reference to C<val>. This is
+the call, and decrementing it if the function returned C<NULL>. Effectively
+a successful C<hv_store> takes ownership of one reference to C<val>. This is
usually what you want; a newly created SV has a reference count of one, so
-if all your code does is create SVs then store them in a hash, hv_store
+if all your code does is create SVs then store them in a hash, C<hv_store>
will own the only reference to the new SV, and your code doesn't need to do
-anything further to tidy up. hv_store is not implemented as a call to
-hv_store_ent, and does not create a temporary SV for the key, so if your
-key data is not already in SV form then use hv_store in preference to
-hv_store_ent.
+anything further to tidy up. C<hv_store> is not implemented as a call to
+C<hv_store_ent>, and does not create a temporary SV for the key, so if your
+key data is not already in SV form then use C<hv_store> in preference to
+C<hv_store_ent>.
See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
information on how to use this function on tied hashes.
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
+C<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. Effectively a successful
-hv_store_ent takes ownership of one reference to C<val>. This is
+C<hv_store_ent> takes ownership of one reference to C<val>. This is
usually what you want; a newly created SV has a reference count of one, so
-if all your code does is create SVs then store them in a hash, hv_store
+if all your code does is create SVs then store them in a hash, C<hv_store>
will own the only reference to the new SV, and your code doesn't need to do
-anything further to tidy up. Note that hv_store_ent only reads the C<key>;
+anything further to tidy up. Note that C<hv_store_ent> only reads the C<key>;
unlike C<val> it does not take ownership of it, so maintaining the correct
-reference count on C<key> is entirely the caller's responsibility. hv_store
-is not implemented as a call to hv_store_ent, and does not create a temporary
+reference count on C<key> is entirely the caller's responsibility. C<hv_store>
+is not implemented as a call to C<hv_store_ent>, and does not create a temporary
SV for the key, so if your key data is not already in SV form then use
-hv_store in preference to hv_store_ent.
+C<hv_store> in preference to C<hv_store_ent>.
See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more
information on how to use this function on tied hashes.
bool is_utf8;
int masked_flags;
const int return_svp = action & HV_FETCH_JUST_SV;
+ HEK *keysv_hek = NULL;
if (!hv)
return NULL;
}
if (flags & HVhek_FREEKEY)
Safefree(key);
- magic_existspack(svret, mg_find(sv, PERL_MAGIC_tiedelem));
+ {
+ MAGIC * const mg = mg_find(sv, PERL_MAGIC_tiedelem);
+ if (mg)
+ magic_existspack(svret, mg);
+ }
/* This cast somewhat evil, but I'm merely using NULL/
not NULL to return the boolean exists.
And I know hv is not NULL. */
}
}
- if (!hash) {
- if (keysv && (SvIsCOW_shared_hash(keysv)))
- hash = SvSHARED_HASH(keysv);
- else
- PERL_HASH(hash, key, klen);
+ if (keysv && (SvIsCOW_shared_hash(keysv))) {
+ if (HvSHAREKEYS(hv))
+ keysv_hek = SvSHARED_HEK_FROM_PV(SvPVX_const(keysv));
+ hash = SvSHARED_HASH(keysv);
}
+ else if (!hash)
+ PERL_HASH(hash, key, klen);
masked_flags = (flags & HVhek_MASK);
{
entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)];
}
+
+ if (!entry)
+ goto not_found;
+
+ if (keysv_hek) {
+ /* keysv is actually a HEK in disguise, so we can match just by
+ * comparing the HEK pointers in the HE chain. There is a slight
+ * caveat: on something like "\x80", which has both plain and utf8
+ * representations, perl's hashes do encoding-insensitive lookups,
+ * but preserve the encoding of the stored key. Thus a particular
+ * key could map to two different HEKs in PL_strtab. We only
+ * conclude 'not found' if all the flags are the same; otherwise
+ * we fall back to a full search (this should only happen in rare
+ * cases).
+ */
+ int keysv_flags = HEK_FLAGS(keysv_hek);
+ HE *orig_entry = entry;
+
+ for (; entry; entry = HeNEXT(entry)) {
+ HEK *hek = HeKEY_hek(entry);
+ if (hek == keysv_hek)
+ goto found;
+ if (HEK_FLAGS(hek) != keysv_flags)
+ break; /* need to do full match */
+ }
+ if (!entry)
+ goto not_found;
+ /* failed on shortcut - do full search loop */
+ entry = orig_entry;
+ }
+
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? */
+ if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8)
continue;
+ found:
if (action & (HV_FETCH_LVALUE|HV_FETCH_ISSTORE)) {
if (HeKFLAGS(entry) != masked_flags) {
/* We match if HVhek_UTF8 bit in our flags and hash key's
if (flags & HVhek_FREEKEY)
Safefree(key);
if (return_svp) {
- return entry ? (void *) &HeVAL(entry) : NULL;
+ return (void *) &HeVAL(entry);
}
return entry;
}
+
+ not_found:
#ifdef DYNAMIC_ENV_FETCH /* %ENV lookup? If so, try to fetch the value now */
if (!(action & HV_FETCH_ISSTORE)
&& SvRMAGICAL((const SV *)hv)
HeKEY_hek(entry) = save_hek_flags(key, klen, hash, flags);
HeVAL(entry) = val;
- if (!*oentry && SvOOK(hv)) {
- /* initial entry, and aux struct present. */
- struct xpvhv_aux *const aux = HvAUX(hv);
- if (aux->xhv_fill_lazy)
- ++aux->xhv_fill_lazy;
- }
-
#ifdef PERL_HASH_RANDOMIZE_KEYS
/* This logic semi-randomizes the insert order in a bucket.
* Either we insert into the top, or the slot below the top,
/*
=for apidoc hv_scalar
-Evaluates the hash in scalar context and returns the result. Handles magic
-when the hash is tied.
+Evaluates the hash in scalar context and returns the result.
+
+When the hash is tied dispatches through to the SCALAR method,
+otherwise returns a mortal SV containing the number of keys
+in the hash.
+
+Note, prior to 5.25 this function returned what is now
+returned by the hv_bucket_ratio() function.
=cut
*/
}
sv = sv_newmortal();
- if (HvTOTALKEYS((const HV *)hv))
+ sv_setuv(sv, HvUSEDKEYS(hv));
+
+ return sv;
+}
+
+/*
+=for apidoc hv_bucket_ratio
+
+If the hash is tied dispatches through to the SCALAR tied method,
+otherwise if the hash contains no keys returns 0, otherwise returns
+a mortal sv containing a string specifying the number of used buckets,
+followed by a slash, followed by the number of available buckets.
+
+This function is expensive, it must scan all of the buckets
+to determine which are used, and the count is NOT cached.
+In a large hash this could be a lot of buckets.
+
+=cut
+*/
+
+SV *
+Perl_hv_bucket_ratio(pTHX_ HV *hv)
+{
+ SV *sv;
+
+ PERL_ARGS_ASSERT_HV_BUCKET_RATIO;
+
+ if (SvRMAGICAL(hv)) {
+ MAGIC * const mg = mg_find((const SV *)hv, PERL_MAGIC_tied);
+ if (mg)
+ return magic_scalarpack(hv, mg);
+ }
+
+ sv = sv_newmortal();
+ if (HvUSEDKEYS((const HV *)hv))
Perl_sv_setpvf(aTHX_ sv, "%ld/%ld",
(long)HvFILL(hv), (long)HvMAX(hv) + 1);
else
the hash, made mortal, and returned to the caller. The absolute
value of C<klen> is the length of the key. If C<klen> is negative the
key is assumed to be in UTF-8-encoded Unicode. The C<flags> value
-will normally be zero; if set to G_DISCARD then NULL will be returned.
-NULL will also be returned if the key is not found.
+will normally be zero; if set to C<G_DISCARD> then C<NULL> will be returned.
+C<NULL> will also be returned if the key is not found.
=for apidoc hv_delete_ent
Deletes a key/value pair in the hash. The value SV is removed from the hash,
made mortal, and returned to the caller. The C<flags> value will normally be
-zero; if set to G_DISCARD then NULL will be returned. NULL will also be
-returned if the key is not found. C<hash> can be a valid precomputed hash
+zero; if set to C<G_DISCARD> then C<NULL> will be returned. C<NULL> will also
+be returned if the key is not found. C<hash> can be a valid precomputed hash
value, or 0 to ask for it to be computed.
=cut
XPVHV* xhv;
HE *entry;
HE **oentry;
- HE *const *first_entry;
+ HE **first_entry;
bool is_utf8 = (k_flags & HVhek_UTF8) ? TRUE : FALSE;
int masked_flags;
+ HEK *keysv_hek = NULL;
+ U8 mro_changes = 0; /* 1 = isa; 2 = package moved */
+ SV *sv;
+ GV *gv = NULL;
+ HV *stash = NULL;
if (SvRMAGICAL(hv)) {
bool needs_copy;
HvHASKFLAGS_on(MUTABLE_SV(hv));
}
- if (!hash) {
- if (keysv && (SvIsCOW_shared_hash(keysv)))
- hash = SvSHARED_HASH(keysv);
- else
- PERL_HASH(hash, key, klen);
+ if (keysv && (SvIsCOW_shared_hash(keysv))) {
+ if (HvSHAREKEYS(hv))
+ keysv_hek = SvSHARED_HEK_FROM_PV(SvPVX_const(keysv));
+ hash = SvSHARED_HASH(keysv);
}
+ else if (!hash)
+ PERL_HASH(hash, key, klen);
masked_flags = (k_flags & HVhek_MASK);
first_entry = oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)];
entry = *oentry;
- for (; entry; oentry = &HeNEXT(entry), entry = *oentry) {
- SV *sv;
- U8 mro_changes = 0; /* 1 = isa; 2 = package moved */
- GV *gv = NULL;
- HV *stash = NULL;
+ if (!entry)
+ goto not_found;
+
+ if (keysv_hek) {
+ /* keysv is actually a HEK in disguise, so we can match just by
+ * comparing the HEK pointers in the HE chain. There is a slight
+ * caveat: on something like "\x80", which has both plain and utf8
+ * representations, perl's hashes do encoding-insensitive lookups,
+ * but preserve the encoding of the stored key. Thus a particular
+ * key could map to two different HEKs in PL_strtab. We only
+ * conclude 'not found' if all the flags are the same; otherwise
+ * we fall back to a full search (this should only happen in rare
+ * cases).
+ */
+ int keysv_flags = HEK_FLAGS(keysv_hek);
+
+ for (; entry; oentry = &HeNEXT(entry), entry = *oentry) {
+ HEK *hek = HeKEY_hek(entry);
+ if (hek == keysv_hek)
+ goto found;
+ if (HEK_FLAGS(hek) != keysv_flags)
+ break; /* need to do full match */
+ }
+ if (!entry)
+ goto not_found;
+ /* failed on shortcut - do full search loop */
+ oentry = first_entry;
+ entry = *oentry;
+ }
+
+ for (; entry; 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? */
+ if (memNE(HeKEY(entry),key,klen)) /* is this it? */
continue;
if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8)
continue;
+ found:
if (hv == PL_strtab) {
if (k_flags & HVhek_FREEKEY)
Safefree(key);
sv_2mortal((SV *)gv)
);
}
- else if (klen == 3 && strnEQ(key, "ISA", 3))
+ else if (klen == 3 && strEQs(key, "ISA") && GvAV(gv)) {
+ AV *isa = GvAV(gv);
+ MAGIC *mg = mg_find((SV*)isa, PERL_MAGIC_isa);
+
mro_changes = 1;
+ if (mg) {
+ if (mg->mg_obj == (SV*)gv) {
+ /* This is the only stash this ISA was used for.
+ * The isaelem magic asserts if there's no
+ * isa magic on the array, so explicitly
+ * remove the magic on both the array and its
+ * elements. @ISA shouldn't be /too/ large.
+ */
+ SV **svp, **end;
+ strip_magic:
+ svp = AvARRAY(isa);
+ end = svp + AvFILLp(isa)+1;
+ while (svp < end) {
+ if (*svp)
+ mg_free_type(*svp, PERL_MAGIC_isaelem);
+ ++svp;
+ }
+ mg_free_type((SV*)GvAV(gv), PERL_MAGIC_isa);
+ }
+ else {
+ /* mg_obj is an array of stashes
+ Note that the array doesn't keep a reference
+ count on the stashes.
+ */
+ AV *av = (AV*)mg->mg_obj;
+ SV **svp, **arrayp;
+ SSize_t index;
+ SSize_t items;
+
+ assert(SvTYPE(mg->mg_obj) == SVt_PVAV);
+
+ /* remove the stash from the magic array */
+ arrayp = svp = AvARRAY(av);
+ items = AvFILLp(av) + 1;
+ if (items == 1) {
+ assert(*arrayp == (SV *)gv);
+ mg->mg_obj = NULL;
+ /* avoid a double free on the last stash */
+ AvFILLp(av) = -1;
+ /* The magic isn't MGf_REFCOUNTED, so release
+ * the array manually.
+ */
+ SvREFCNT_dec_NN(av);
+ goto strip_magic;
+ }
+ else {
+ while (items--) {
+ if (*svp == (SV*)gv)
+ break;
+ ++svp;
+ }
+ index = svp - arrayp;
+ assert(index >= 0 && index <= AvFILLp(av));
+ if (index < AvFILLp(av)) {
+ arrayp[index] = arrayp[AvFILLp(av)];
+ }
+ arrayp[AvFILLp(av)] = NULL;
+ --AvFILLp(av);
+ }
+ }
+ }
+ }
}
sv = d_flags & G_DISCARD ? HeVAL(entry) : sv_2mortal(HeVAL(entry));
HvPLACEHOLDERS(hv)++;
else {
*oentry = HeNEXT(entry);
- if(!*first_entry && SvOOK(hv)) {
- /* removed last entry, and aux struct present. */
- struct xpvhv_aux *const aux = HvAUX(hv);
- if (aux->xhv_fill_lazy)
- --aux->xhv_fill_lazy;
- }
if (SvOOK(hv) && entry == HvAUX(hv)->xhv_eiter /* HvEITER(hv) */)
HvLAZYDEL_on(hv);
else {
return sv;
}
+
+ not_found:
if (SvREADONLY(hv)) {
hv_notallowed(k_flags, key, klen,
"Attempt to delete disallowed key '%"SVf"' from"
STATIC void
S_hsplit(pTHX_ HV *hv, STRLEN const oldsize, STRLEN newsize)
{
- dVAR;
STRLEN i = 0;
char *a = (char*) HvARRAY(hv);
HE **aep;
#ifdef PERL_HASH_RANDOMIZE_KEYS
dest->xhv_rand = (U32)PL_hash_rand_bits;
#endif
- /* For now, just reset the lazy fill counter.
- It would be possible to update the counter in the code below
- instead. */
- dest->xhv_fill_lazy = 0;
} else {
/* no existing aux structure, but we allocated space for one
- * so intialize it properly. This unrolls hv_auxinit() a bit,
+ * so initialize it properly. This unrolls hv_auxinit() a bit,
* since we have to do the realloc anyway. */
/* first we set the iterator's xhv_rand so it can be copied into lastrand below */
#ifdef PERL_HASH_RANDOMIZE_KEYS
* and use the new low bit to decide if we insert at top,
* or next from top. IOW, we only rotate on a collision.*/
if (aep[j] && PL_HASH_RAND_BITS_ENABLED) {
- PL_hash_rand_bits+= ROTL_UV(HeHASH(entry), 17);
+ PL_hash_rand_bits+= ROTL32(HeHASH(entry), 17);
PL_hash_rand_bits= ROTL_UV(PL_hash_rand_bits,1);
if (PL_hash_rand_bits & 1) {
HeNEXT(entry)= HeNEXT(aep[j]);
void
Perl_hv_ksplit(pTHX_ HV *hv, IV newmax)
{
- dVAR;
XPVHV* xhv = (XPVHV*)SvANY(hv);
const I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */
I32 newsize;
/*
=for apidoc Am|HV *|hv_copy_hints_hv|HV *ohv
-A specialised version of L</newHVhv> for copying C<%^H>. I<ohv> must be
+A specialised version of L</newHVhv> for copying C<%^H>. C<ohv> must be
a pointer to a hash (which may have C<%^H> magic, but should be generally
non-magical), or C<NULL> (interpreted as an empty hash). The content
-of I<ohv> is copied to a new hash, which has the C<%^H>-specific magic
+of C<ohv> is copied to a new hash, which has the C<%^H>-specific magic
added to it. A pointer to the new hash is returned.
=cut
STATIC SV*
S_hv_free_ent_ret(pTHX_ HV *hv, HE *entry)
{
- dVAR;
SV *val;
PERL_ARGS_ASSERT_HV_FREE_ENT_RET;
void
Perl_hv_free_ent(pTHX_ HV *hv, HE *entry)
{
- dVAR;
SV *val;
PERL_ARGS_ASSERT_HV_FREE_ENT;
void
Perl_hv_delayfree_ent(pTHX_ HV *hv, HE *entry)
{
- dVAR;
-
PERL_ARGS_ASSERT_HV_DELAYFREE_ENT;
if (!entry)
Frees the all the elements of a hash, leaving it empty.
The XS equivalent of C<%hash = ()>. See also L</hv_undef>.
-If any destructors are triggered as a result, the hv itself may
-be freed.
+See L</av_clear> for a note about the hash possibly being invalid on
+return.
=cut
*/
Perl_hv_clear(pTHX_ HV *hv)
{
dVAR;
+ SSize_t orig_ix;
+
XPVHV* xhv;
if (!hv)
return;
xhv = (XPVHV*)SvANY(hv);
- ENTER;
- SAVEFREESV(SvREFCNT_inc_simple_NN(hv));
+ /* avoid hv being freed when calling destructors below */
+ EXTEND_MORTAL(1);
+ PL_tmps_stack[++PL_tmps_ix] = SvREFCNT_inc_simple_NN(hv);
+ orig_ix = PL_tmps_ix;
if (SvREADONLY(hv) && HvARRAY(hv) != NULL) {
/* restricted hash: convert all keys to placeholders */
STRLEN i;
mro_isa_changed_in(hv);
HvEITER_set(hv, NULL);
}
- LEAVE;
+ /* disarm hv's premature free guard */
+ if (LIKELY(PL_tmps_ix == orig_ix))
+ PL_tmps_ix--;
+ else
+ PL_tmps_stack[orig_ix] = &PL_sv_undef;
+ SvREFCNT_dec_NN(hv);
}
/*
Clears any placeholders from a hash. If a restricted hash has any of its keys
marked as readonly and the key is subsequently deleted, the key is not actually
-deleted but is marked by assigning it a value of &PL_sv_placeholder. This tags
+deleted but is marked by assigning it a value of C<&PL_sv_placeholder>. This tags
it so it will be ignored by future operations such as iterating over the hash,
but will still allow the hash to have a value reassigned to the key at some
future point. This function clears any such placeholder keys from the hash.
-See Hash::Util::lock_keys() for an example of its use.
+See C<L<Hash::Util::lock_keys()|Hash::Util/lock_keys>> for an example of its
+use.
=cut
*/
void
Perl_hv_clear_placeholders(pTHX_ HV *hv)
{
- dVAR;
const U32 items = (U32)HvPLACEHOLDERS_get(hv);
PERL_ARGS_ASSERT_HV_CLEAR_PLACEHOLDERS;
} while (--i >= 0);
/* You can't get here, hence assertion should always fail. */
assert (items == 0);
- NOT_REACHED;
+ NOT_REACHED; /* NOTREACHED */
}
STATIC void
iter->xhv_last_rand = iter->xhv_rand;
#endif
}
- /* Reset any cached HvFILL() to "unknown". It's unlikely that anyone
- will actually call HvFILL() on a hash under destruction, so it
- seems pointless attempting to track the number of keys remaining.
- But if they do, we want to reset it again. */
- if (iter->xhv_fill_lazy)
- iter->xhv_fill_lazy = 0;
}
if (!((XPVHV*)SvANY(hv))->xhv_keys)
Undefines the hash. The XS equivalent of C<undef(%hash)>.
-As well as freeing all the elements of the hash (like hv_clear()), this
+As well as freeing all the elements of the hash (like C<hv_clear()>), this
also frees any auxiliary data and storage associated with the hash.
-If any destructors are triggered as a result, the hv itself may
-be freed.
-
-See also L</hv_clear>.
+See L</av_clear> for a note about the hash possibly being invalid on
+return.
=cut
*/
void
Perl_hv_undef_flags(pTHX_ HV *hv, U32 flags)
{
- dVAR;
XPVHV* xhv;
bool save;
+ SSize_t orig_ix;
if (!hv)
return;
- save = !!SvREFCNT(hv);
+ save = cBOOL(SvREFCNT(hv));
DEBUG_A(Perl_hv_assert(aTHX_ hv));
xhv = (XPVHV*)SvANY(hv);
if (PL_phase != PERL_PHASE_DESTRUCT && HvNAME(hv)) {
if (PL_stashcache) {
DEBUG_o(Perl_deb(aTHX_ "hv_undef_flags clearing PL_stashcache for '%"
- HEKf"'\n", HvNAME_HEK(hv)));
+ HEKf"'\n", HEKfARG(HvNAME_HEK(hv))));
(void)hv_deletehek(PL_stashcache, HvNAME_HEK(hv), G_DISCARD);
}
hv_name_set(hv, NULL, 0, 0);
}
if (save) {
- ENTER;
- SAVEFREESV(SvREFCNT_inc_simple_NN(hv));
+ /* avoid hv being freed when calling destructors below */
+ EXTEND_MORTAL(1);
+ PL_tmps_stack[++PL_tmps_ix] = SvREFCNT_inc_simple_NN(hv);
+ orig_ix = PL_tmps_ix;
}
hfreeentries(hv);
if (SvOOK(hv)) {
mro_isa_changed_in(hv);
if (PL_stashcache) {
DEBUG_o(Perl_deb(aTHX_ "hv_undef_flags clearing PL_stashcache for effective name '%"
- HEKf"'\n", HvENAME_HEK(hv)));
+ HEKf"'\n", HEKfARG(HvENAME_HEK(hv))));
(void)hv_deletehek(PL_stashcache, HvENAME_HEK(hv), G_DISCARD);
}
}
if (flags & HV_NAME_SETALL ? !!HvAUX(hv)->xhv_name_u.xhvnameu_name : !!name) {
if (name && PL_stashcache) {
DEBUG_o(Perl_deb(aTHX_ "hv_undef_flags clearing PL_stashcache for name '%"
- HEKf"'\n", HvNAME_HEK(hv)));
+ HEKf"'\n", HEKfARG(HvNAME_HEK(hv))));
(void)hv_deletehek(PL_stashcache, HvNAME_HEK(hv), G_DISCARD);
}
hv_name_set(hv, NULL, 0, flags);
if (SvRMAGICAL(hv))
mg_clear(MUTABLE_SV(hv));
- if (save) LEAVE;
+
+ if (save) {
+ /* disarm hv's premature free guard */
+ if (LIKELY(PL_tmps_ix == orig_ix))
+ PL_tmps_ix--;
+ else
+ PL_tmps_stack[orig_ix] = &PL_sv_undef;
+ SvREFCNT_dec_NN(hv);
+ }
}
/*
=for apidoc hv_fill
-Returns the number of hash buckets that
-happen to be in use. This function is
-wrapped by the macro C<HvFILL>.
+Returns the number of hash buckets that happen to be in use.
+
+This function is wrapped by the macro C<HvFILL>.
-Previously this value was always stored in the HV structure, which created an
-overhead on every hash (and pretty much every object) for something that was
-rarely used. Now we calculate it on demand the first
-time that it is needed, and cache it if that calculation
-is going to be costly to repeat. The cached
-value is updated by insertions and deletions, but (currently) discarded if
-the hash is split.
+As of perl 5.25 this function is used only for debugging
+purposes, and the number of used hash buckets is not
+in any way cached, thus this function can be costly
+to execute as it must iterate over all the buckets in the
+hash.
=cut
*/
{
STRLEN count = 0;
HE **ents = HvARRAY(hv);
- struct xpvhv_aux *aux = SvOOK(hv) ? HvAUX(hv) : NULL;
PERL_ARGS_ASSERT_HV_FILL;
if (HvTOTALKEYS(hv) < 2)
return HvTOTALKEYS(hv);
-#ifndef DEBUGGING
- if (aux && aux->xhv_fill_lazy)
- return aux->xhv_fill_lazy;
-#endif
-
if (ents) {
+ /* I wonder why we count down here...
+ * Is it some micro-optimisation?
+ * I would have thought counting up was better.
+ * - Yves
+ */
HE *const *const last = ents + HvMAX(hv);
count = last + 1 - ents;
--count;
} while (++ents <= last);
}
- if (aux) {
-#ifdef DEBUGGING
- if (aux->xhv_fill_lazy)
- assert(aux->xhv_fill_lazy == count);
-#endif
- aux->xhv_fill_lazy = count;
- } else if (HvMAX(hv) >= HV_FILL_THRESHOLD) {
- aux = hv_auxinit(hv);
- aux->xhv_fill_lazy = count;
- }
return count;
}
#ifdef PERL_HASH_RANDOMIZE_KEYS
iter->xhv_last_rand = iter->xhv_rand;
#endif
- iter->xhv_fill_lazy = 0;
iter->xhv_name_u.xhvnameu_name = 0;
iter->xhv_name_count = 0;
iter->xhv_backreferences = 0;
{
PERL_ARGS_ASSERT_HV_ITERINIT;
- /* FIXME: Are we not NULL, or do we croak? Place bets now! */
-
- if (!hv)
- Perl_croak(aTHX_ "Bad hash");
-
if (SvOOK(hv)) {
struct xpvhv_aux * iter = HvAUX(hv);
HE * const entry = iter->xhv_eiter; /* HvEITER(hv) */
hv_auxinit(hv);
}
- /* used to be xhv->xhv_fill before 5.004_65 */
+ /* note this includes placeholders! */
return HvTOTALKEYS(hv);
}
PERL_ARGS_ASSERT_HV_RITER_P;
- if (!hv)
- Perl_croak(aTHX_ "Bad hash");
-
iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv);
return &(iter->xhv_riter);
}
PERL_ARGS_ASSERT_HV_EITER_P;
- if (!hv)
- Perl_croak(aTHX_ "Bad hash");
-
iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv);
return &(iter->xhv_eiter);
}
PERL_ARGS_ASSERT_HV_RITER_SET;
- if (!hv)
- Perl_croak(aTHX_ "Bad hash");
-
if (SvOOK(hv)) {
iter = HvAUX(hv);
} else {
PERL_ARGS_ASSERT_HV_RAND_SET;
#ifdef PERL_HASH_RANDOMIZE_KEYS
- if (!hv)
- Perl_croak(aTHX_ "Bad hash");
-
if (SvOOK(hv)) {
iter = HvAUX(hv);
} else {
PERL_ARGS_ASSERT_HV_EITER_SET;
- if (!hv)
- Perl_croak(aTHX_ "Bad hash");
-
if (SvOOK(hv)) {
iter = HvAUX(hv);
} else {
=for apidoc hv_ename_add
Adds a name to a stash's internal list of effective names. See
-C<hv_ename_delete>.
+C<L</hv_ename_delete>>.
This is called when a stash is assigned to a new location in the symbol
table.
PERL_HASH(hash, name, len);
if (aux->xhv_name_count) {
- HEK ** const xhv_name = aux->xhv_name_u.xhvnameu_names;
I32 count = aux->xhv_name_count;
- HEK **hekp = xhv_name + (count < 0 ? -count : count);
+ HEK ** const xhv_name = aux->xhv_name_u.xhvnameu_names + (count<0);
+ HEK **hekp = xhv_name + (count < 0 ? -count - 1 : count);
while (hekp-- > xhv_name)
+ {
+ assert(*hekp);
if (
(HEK_UTF8(*hekp) || (flags & SVf_UTF8))
? hek_eq_pvn_flags(aTHX_ *hekp, name, (I32)len, flags)
aux->xhv_name_count = -count;
return;
}
+ }
if (count < 0) aux->xhv_name_count--, count = -count;
else aux->xhv_name_count++;
Renew(aux->xhv_name_u.xhvnameu_names, count + 1, HEK *);
void
Perl_hv_ename_delete(pTHX_ HV *hv, const char *name, U32 len, U32 flags)
{
- dVAR;
struct xpvhv_aux *aux;
PERL_ARGS_ASSERT_HV_ENAME_DELETE;
return;
}
if (
- count > 0 && (HEK_UTF8(*namep) || (flags & SVf_UTF8))
+ count > 0 && ((HEK_UTF8(*namep) || (flags & SVf_UTF8))
? hek_eq_pvn_flags(aTHX_ *namep, name, (I32)len, flags)
: (HEK_LEN(*namep) == (I32)len && memEQ(HEK_KEY(*namep), name, len))
+ )
) {
aux->xhv_name_count = -count;
}
AV **
Perl_hv_backreferences_p(pTHX_ HV *hv) {
- struct xpvhv_aux * const iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv);
-
PERL_ARGS_ASSERT_HV_BACKREFERENCES_P;
- PERL_UNUSED_CONTEXT;
-
- return &(iter->xhv_backreferences);
+ /* See also Perl_sv_get_backrefs in sv.c where this logic is unrolled */
+ {
+ struct xpvhv_aux * const iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv);
+ return &(iter->xhv_backreferences);
+ }
}
void
=for apidoc hv_iternext
-Returns entries from a hash iterator. See C<hv_iterinit>.
+Returns entries from a hash iterator. See C<L</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
=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
+Returns entries from a hash iterator. See C<L</hv_iterinit>> and
+C<L</hv_iternext>>.
+The C<flags> value will normally be zero; if C<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
PERL_ARGS_ASSERT_HV_ITERNEXT_FLAGS;
- if (!hv)
- Perl_croak(aTHX_ "Bad hash");
-
xhv = (XPVHV*)SvANY(hv);
if (!SvOOK(hv)) {
=for apidoc hv_iterkey
Returns the key from the current position of the hash iterator. See
-C<hv_iterinit>.
+C<L</hv_iterinit>>.
=cut
*/
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>.
+see C<L</hv_iterinit>>.
=cut
*/
=for apidoc hv_iterval
Returns the value from the current position of the hash iterator. See
-C<hv_iterkey>.
+C<L</hv_iterkey>>.
=cut
*/
=for apidoc hv_magic
-Adds magic to a hash. See C<sv_magic>.
+Adds magic to a hash. See C<L</sv_magic>>.
=cut
*/
STATIC void
S_unshare_hek_or_pvn(pTHX_ const HEK *hek, const char *str, I32 len, U32 hash)
{
- dVAR;
XPVHV* xhv;
HE *entry;
HE **oentry;
STATIC HEK *
S_share_hek_flags(pTHX_ const char *str, I32 len, U32 hash, int flags)
{
- dVAR;
HE *entry;
const int flags_masked = flags & HVhek_MASK;
const U32 hindex = hash & (I32) HvMAX(PL_strtab);
SSize_t *
Perl_hv_placeholders_p(pTHX_ HV *hv)
{
- dVAR;
MAGIC *mg = mg_find((const SV *)hv, PERL_MAGIC_rhash);
PERL_ARGS_ASSERT_HV_PLACEHOLDERS_P;
I32
Perl_hv_placeholders_get(pTHX_ const HV *hv)
{
- dVAR;
MAGIC * const mg = mg_find((const SV *)hv, PERL_MAGIC_rhash);
PERL_ARGS_ASSERT_HV_PLACEHOLDERS_GET;
+ PERL_UNUSED_CONTEXT;
return mg ? mg->mg_len : 0;
}
void
Perl_hv_placeholders_set(pTHX_ HV *hv, I32 ph)
{
- dVAR;
MAGIC * const mg = mg_find((const SV *)hv, PERL_MAGIC_rhash);
PERL_ARGS_ASSERT_HV_PLACEHOLDERS_SET;
Generates and returns a C<HV *> representing the content of a
C<refcounted_he> chain.
-I<flags> is currently unused and must be zero.
+C<flags> is currently unused and must be zero.
=cut
*/
=for apidoc m|SV *|refcounted_he_fetch_pvn|const struct refcounted_he *chain|const char *keypv|STRLEN keylen|U32 hash|U32 flags
Search along a C<refcounted_he> chain for an entry with the key specified
-by I<keypv> and I<keylen>. If I<flags> has the C<REFCOUNTED_HE_KEY_UTF8>
+by C<keypv> and C<keylen>. If C<flags> has the C<REFCOUNTED_HE_KEY_UTF8>
bit set, the key octets are interpreted as UTF-8, otherwise they
-are interpreted as Latin-1. I<hash> is a precomputed hash of the key
+are interpreted as Latin-1. C<hash> is a precomputed hash of the key
string, or zero if it has not been precomputed. Returns a mortal scalar
representing the value associated with the key, or C<&PL_sv_placeholder>
if there is no value associated with the key.
Perl_croak(aTHX_ "panic: refcounted_he_fetch_pvn bad flags %"UVxf,
(UV)flags);
if (!chain)
- return &PL_sv_placeholder;
+ goto ret;
if (flags & REFCOUNTED_HE_KEY_UTF8) {
/* For searching purposes, canonicalise to Latin-1 where possible. */
const char *keyend = keypv + keylen, *p;
}
else {
p++;
- *q = (char) TWO_BYTE_UTF8_TO_NATIVE(c, *p);
+ *q = (char) EIGHT_BIT_UTF8_TO_NATIVE(c, *p);
}
}
}
return sv_2mortal(refcounted_he_value(chain));
}
}
+ ret:
return flags & REFCOUNTED_HE_EXISTS ? NULL : &PL_sv_placeholder;
}
the new key/value pair takes precedence over any entry for the same key
further along the chain.
-The new key is specified by I<keypv> and I<keylen>. If I<flags> has
+The new key is specified by C<keypv> and C<keylen>. If C<flags> has
the C<REFCOUNTED_HE_KEY_UTF8> bit set, the key octets are interpreted
-as UTF-8, otherwise they are interpreted as Latin-1. I<hash> is
+as UTF-8, otherwise they are interpreted as Latin-1. C<hash> is
a precomputed hash of the key string, or zero if it has not been
precomputed.
-I<value> is the scalar value to store for this key. I<value> is copied
+C<value> is the scalar value to store for this key. C<value> is copied
by this function, which thus does not take ownership of any reference
to it, and later changes to the scalar will not be reflected in the
value visible in the C<refcounted_he>. Complex types of scalar will not
be stored with referential integrity, but will be coerced to strings.
-I<value> may be either null or C<&PL_sv_placeholder> to indicate that no
+C<value> may be either null or C<&PL_sv_placeholder> to indicate that no
value is to be associated with the key; this, as with any non-null value,
takes precedence over the existence of a value for the key further along
the chain.
-
I<parent> points to the rest of the C<refcounted_he> chain to be
+
C<parent> points to the rest of the C<refcounted_he> chain to be
attached to the new C<refcounted_he>. This function takes ownership
-of one reference to
I<parent>, and returns one reference to the new
+of one reference to
C<parent>, and returns one reference to the new
C<refcounted_he>.
=cut
}
else {
p++;
- *q = (char) TWO_BYTE_UTF8_TO_NATIVE(c, *p);
+ *q = (char) EIGHT_BIT_UTF8_TO_NATIVE(c, *p);
}
}
}
void
Perl_refcounted_he_free(pTHX_ struct refcounted_he *he) {
+#ifdef USE_ITHREADS
dVAR;
+#endif
PERL_UNUSED_CONTEXT;
while (he) {
struct refcounted_he *
Perl_refcounted_he_inc(pTHX_ struct refcounted_he *he)
{
+#ifdef USE_ITHREADS
dVAR;
+#endif
+ PERL_UNUSED_CONTEXT;
if (he) {
HINTS_REFCNT_LOCK;
he->refcounted_he_refcnt++;
struct refcounted_he *const chain = cop->cop_hints_hash;
PERL_ARGS_ASSERT_COP_FETCH_LABEL;
+ PERL_UNUSED_CONTEXT;
if (!chain)
return NULL;
Save a label into a C<cop_hints_hash>.
You need to set flags to C<SVf_UTF8>
-for a utf-8 label.
+for a UTF-8 label.
=cut
*/
#endif
/*
- * Local variables:
- * c-indentation-style: bsd
- * c-basic-offset: 4
- * indent-tabs-mode: nil
- * End:
- *
* ex: set ts=8 sts=4 sw=4 et:
*/
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