3 * Copyright (C) 1991, 1992, 1993, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
11 /* These control hash traversal randomization and the environment variable PERL_PERTURB_KEYS.
12 * Currently disabling this functionality will break a few tests, but should otherwise work fine.
13 * See perlrun for more details. */
15 #if defined(PERL_PERTURB_KEYS_DISABLED)
16 # define PL_HASH_RAND_BITS_ENABLED 0
17 # define PERL_HASH_ITER_BUCKET(iter) ((iter)->xhv_riter)
19 # define PERL_HASH_RANDOMIZE_KEYS 1
20 # if defined(PERL_PERTURB_KEYS_RANDOM)
21 # define PL_HASH_RAND_BITS_ENABLED 1
22 # elif defined(PERL_PERTURB_KEYS_DETERMINISTIC)
23 # define PL_HASH_RAND_BITS_ENABLED 2
25 # define USE_PERL_PERTURB_KEYS 1
26 # define PL_HASH_RAND_BITS_ENABLED PL_hash_rand_bits_enabled
28 # define PERL_HASH_ITER_BUCKET(iter) (((iter)->xhv_riter) ^ ((iter)->xhv_rand))
31 /* entry in hash value chain */
33 /* Keep hent_next first in this structure, because sv_free_arenas take
34 advantage of this to share code between the he arenas and the SV
36 HE *hent_next; /* next entry in chain */
37 HEK *hent_hek; /* hash key */
39 SV *hent_val; /* scalar value that was hashed */
40 Size_t hent_refcount; /* references for this shared hash key */
44 /* hash key -- defined separately for use as shared pointer */
46 U32 hek_hash; /* hash of key */
47 I32 hek_len; /* length of hash key */
48 char hek_key[1]; /* variable-length hash key */
49 /* the hash-key is \0-terminated */
50 /* after the \0 there is a byte for flags, such as whether the key
55 struct he shared_he_he;
56 struct hek shared_he_hek;
60 Don't access this directly.
61 Use the funcs in mro.c
65 AV *(*resolve)(pTHX_ HV* stash, U32 level);
68 U16 kflags; /* For the hash API - set HVhek_UTF8 if name is UTF-8 */
73 /* a hash holding the different MROs private data. */
75 /* a pointer directly to the current MROs private data. If mro_linear_all
76 is NULL, this owns the SV reference, else it is just a pointer to a
77 value stored in and owned by mro_linear_all. */
78 SV *mro_linear_current;
79 HV *mro_nextmethod; /* next::method caching */
80 U32 cache_gen; /* Bumping this invalidates our method cache */
81 U32 pkg_gen; /* Bumps when local methods/@ISA change */
82 const struct mro_alg *mro_which; /* which mro alg is in use? */
83 HV *isa; /* Everything this class @ISA */
86 #define MRO_GET_PRIVATE_DATA(smeta, which) \
87 (((smeta)->mro_which && (which) == (smeta)->mro_which) \
88 ? (smeta)->mro_linear_current \
89 : Perl_mro_get_private_data(aTHX_ (smeta), (which)))
92 Don't access this directly.
96 HEK *xhvnameu_name; /* When xhv_name_count is 0 */
97 HEK **xhvnameu_names; /* When xhv_name_count is non-0 */
101 union _xhvnameu xhv_name_u; /* name, if a symbol table */
102 AV *xhv_backreferences; /* back references for weak references */
103 HE *xhv_eiter; /* current entry of iterator */
104 I32 xhv_riter; /* current root of iterator */
106 /* Concerning xhv_name_count: When non-zero, xhv_name_u contains a pointer
107 * to an array of HEK pointers, this being the length. The first element is
108 * the name of the stash, which may be NULL. If xhv_name_count is positive,
109 * then *xhv_name is one of the effective names. If xhv_name_count is nega-
110 * tive, then xhv_name_u.xhvnameu_names[1] is the first effective name.
113 struct mro_meta *xhv_mro_meta;
114 HV * xhv_super; /* SUPER method cache */
115 #ifdef PERL_HASH_RANDOMIZE_KEYS
116 U32 xhv_rand; /* random value for hash traversal */
117 U32 xhv_last_rand; /* last random value for hash traversal,
118 used to detect each() after insert for warnings */
123 /* hash structure: */
124 /* This structure must match the beginning of struct xpvmg in sv.h. */
126 HV* xmg_stash; /* class package */
128 STRLEN xhv_keys; /* total keys, including placeholders */
129 STRLEN xhv_max; /* subscript of last element of xhv_array */
133 =head1 Hash Manipulation Functions
135 =for apidoc AmU||HEf_SVKEY
136 This flag, used in the length slot of hash entries and magic structures,
137 specifies the structure contains an C<SV*> pointer where a C<char*> pointer
138 is to be expected. (For information only--not to be used).
142 =for apidoc AmU||Nullhv
145 (deprecated - use C<(HV *)NULL> instead)
147 =head1 Hash Manipulation Functions
149 =for apidoc Am|char*|HvNAME|HV* stash
150 Returns the package name of a stash, or NULL if C<stash> isn't a stash.
151 See C<SvSTASH>, C<CvSTASH>.
153 =for apidoc Am|STRLEN|HvNAMELEN|HV *stash
154 Returns the length of the stash's name.
156 =for apidoc Am|unsigned char|HvNAMEUTF8|HV *stash
157 Returns true if the name is in UTF8 encoding.
159 =for apidoc Am|char*|HvENAME|HV* stash
160 Returns the effective name of a stash, or NULL if there is none. The
161 effective name represents a location in the symbol table where this stash
162 resides. It is updated automatically when packages are aliased or deleted.
163 A stash that is no longer in the symbol table has no effective name. This
164 name is preferable to C<HvNAME> for use in MRO linearisations and isa
167 =for apidoc Am|STRLEN|HvENAMELEN|HV *stash
168 Returns the length of the stash's effective name.
170 =for apidoc Am|unsigned char|HvENAMEUTF8|HV *stash
171 Returns true if the effective name is in UTF8 encoding.
173 =for apidoc Am|void*|HeKEY|HE* he
174 Returns the actual pointer stored in the key slot of the hash entry. The
175 pointer may be either C<char*> or C<SV*>, depending on the value of
176 C<HeKLEN()>. Can be assigned to. The C<HePV()> or C<HeSVKEY()> macros are
177 usually preferable for finding the value of a key.
179 =for apidoc Am|STRLEN|HeKLEN|HE* he
180 If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry
181 holds an C<SV*> key. Otherwise, holds the actual length of the key. Can
182 be assigned to. The C<HePV()> macro is usually preferable for finding key
185 =for apidoc Am|SV*|HeVAL|HE* he
186 Returns the value slot (type C<SV*>) stored in the hash entry. Can be assigned
193 =for apidoc Am|U32|HeHASH|HE* he
194 Returns the computed hash stored in the hash entry.
196 =for apidoc Am|char*|HePV|HE* he|STRLEN len
197 Returns the key slot of the hash entry as a C<char*> value, doing any
198 necessary dereferencing of possibly C<SV*> keys. The length of the string
199 is placed in C<len> (this is a macro, so do I<not> use C<&len>). If you do
200 not care about what the length of the key is, you may use the global
201 variable C<PL_na>, though this is rather less efficient than using a local
202 variable. Remember though, that hash keys in perl are free to contain
203 embedded nulls, so using C<strlen()> or similar is not a good way to find
204 the length of hash keys. This is very similar to the C<SvPV()> macro
205 described elsewhere in this document. See also C<HeUTF8>.
207 If you are using C<HePV> to get values to pass to C<newSVpvn()> to create a
208 new SV, you should consider using C<newSVhek(HeKEY_hek(he))> as it is more
211 =for apidoc Am|char*|HeUTF8|HE* he
212 Returns whether the C<char *> value returned by C<HePV> is encoded in UTF-8,
213 doing any necessary dereferencing of possibly C<SV*> keys. The value returned
214 will be 0 or non-0, not necessarily 1 (or even a value with any low bits set),
215 so B<do not> blindly assign this to a C<bool> variable, as C<bool> may be a
218 =for apidoc Am|SV*|HeSVKEY|HE* he
219 Returns the key as an C<SV*>, or C<NULL> if the hash entry does not
220 contain an C<SV*> key.
222 =for apidoc Am|SV*|HeSVKEY_force|HE* he
223 Returns the key as an C<SV*>. Will create and return a temporary mortal
224 C<SV*> if the hash entry contains only a C<char*> key.
226 =for apidoc Am|SV*|HeSVKEY_set|HE* he|SV* sv
227 Sets the key to a given C<SV*>, taking care to set the appropriate flags to
228 indicate the presence of an C<SV*> key, and returns the same
234 #define PERL_HASH_DEFAULT_HvMAX 7
236 /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */
237 #define HEf_SVKEY -2 /* hent_key is an SV* */
240 # define Nullhv Null(HV*)
242 #define HvARRAY(hv) ((hv)->sv_u.svu_hash)
243 #define HvFILL(hv) Perl_hv_fill(aTHX_ MUTABLE_HV(hv))
244 #define HvMAX(hv) ((XPVHV*) SvANY(hv))->xhv_max
245 /* This quite intentionally does no flag checking first. That's your
247 #define HvAUX(hv) ((struct xpvhv_aux*)&(HvARRAY(hv)[HvMAX(hv)+1]))
248 #define HvRITER(hv) (*Perl_hv_riter_p(aTHX_ MUTABLE_HV(hv)))
249 #define HvEITER(hv) (*Perl_hv_eiter_p(aTHX_ MUTABLE_HV(hv)))
250 #define HvRITER_set(hv,r) Perl_hv_riter_set(aTHX_ MUTABLE_HV(hv), r)
251 #define HvEITER_set(hv,e) Perl_hv_eiter_set(aTHX_ MUTABLE_HV(hv), e)
252 #define HvRITER_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_riter : -1)
253 #define HvEITER_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_eiter : NULL)
254 #define HvRAND_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_rand : 0)
255 #define HvLASTRAND_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_last_rand : 0)
257 #define HvNAME(hv) HvNAME_get(hv)
258 #define HvNAMELEN(hv) HvNAMELEN_get(hv)
259 #define HvENAME(hv) HvENAME_get(hv)
260 #define HvENAMELEN(hv) HvENAMELEN_get(hv)
262 /* Checking that hv is a valid package stash is the
263 caller's responsibility */
264 #define HvMROMETA(hv) (HvAUX(hv)->xhv_mro_meta \
265 ? HvAUX(hv)->xhv_mro_meta \
266 : Perl_mro_meta_init(aTHX_ hv))
268 #define HvNAME_HEK_NN(hv) \
270 HvAUX(hv)->xhv_name_count \
271 ? *HvAUX(hv)->xhv_name_u.xhvnameu_names \
272 : HvAUX(hv)->xhv_name_u.xhvnameu_name \
274 /* This macro may go away without notice. */
275 #define HvNAME_HEK(hv) \
276 (SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name ? HvNAME_HEK_NN(hv) : NULL)
277 #define HvNAME_get(hv) \
278 ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
279 ? HEK_KEY(HvNAME_HEK_NN(hv)) : NULL)
280 #define HvNAMELEN_get(hv) \
281 ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
282 ? HEK_LEN(HvNAME_HEK_NN(hv)) : 0)
283 #define HvNAMEUTF8(hv) \
284 ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
285 ? HEK_UTF8(HvNAME_HEK_NN(hv)) : 0)
286 #define HvENAME_HEK_NN(hv) \
288 HvAUX(hv)->xhv_name_count > 0 ? HvAUX(hv)->xhv_name_u.xhvnameu_names[0] : \
289 HvAUX(hv)->xhv_name_count < -1 ? HvAUX(hv)->xhv_name_u.xhvnameu_names[1] : \
290 HvAUX(hv)->xhv_name_count == -1 ? NULL : \
291 HvAUX(hv)->xhv_name_u.xhvnameu_name \
293 #define HvENAME_HEK(hv) \
294 (SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name ? HvENAME_HEK_NN(hv) : NULL)
295 #define HvENAME_get(hv) \
296 ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvAUX(hv)->xhv_name_count != -1) \
297 ? HEK_KEY(HvENAME_HEK_NN(hv)) : NULL)
298 #define HvENAMELEN_get(hv) \
299 ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvAUX(hv)->xhv_name_count != -1) \
300 ? HEK_LEN(HvENAME_HEK_NN(hv)) : 0)
301 #define HvENAMEUTF8(hv) \
302 ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvAUX(hv)->xhv_name_count != -1) \
303 ? HEK_UTF8(HvENAME_HEK_NN(hv)) : 0)
305 /* the number of keys (including any placeholders) */
306 #define XHvTOTALKEYS(xhv) ((xhv)->xhv_keys)
309 * HvKEYS gets the number of keys that actually exist(), and is provided
310 * for backwards compatibility with old XS code. The core uses HvUSEDKEYS
311 * (keys, excluding placeholders) and HvTOTALKEYS (including placeholders)
313 #define HvKEYS(hv) HvUSEDKEYS(hv)
314 #define HvUSEDKEYS(hv) (HvTOTALKEYS(hv) - HvPLACEHOLDERS_get(hv))
315 #define HvTOTALKEYS(hv) XHvTOTALKEYS((XPVHV*) SvANY(hv))
316 #define HvPLACEHOLDERS(hv) (*Perl_hv_placeholders_p(aTHX_ MUTABLE_HV(hv)))
317 #define HvPLACEHOLDERS_get(hv) (SvMAGIC(hv) ? Perl_hv_placeholders_get(aTHX_ (const HV *)hv) : 0)
318 #define HvPLACEHOLDERS_set(hv,p) Perl_hv_placeholders_set(aTHX_ MUTABLE_HV(hv), p)
320 #define HvSHAREKEYS(hv) (SvFLAGS(hv) & SVphv_SHAREKEYS)
321 #define HvSHAREKEYS_on(hv) (SvFLAGS(hv) |= SVphv_SHAREKEYS)
322 #define HvSHAREKEYS_off(hv) (SvFLAGS(hv) &= ~SVphv_SHAREKEYS)
324 /* This is an optimisation flag. It won't be set if all hash keys have a 0
325 * flag. Currently the only flags relate to utf8.
326 * Hence it won't be set if all keys are 8 bit only. It will be set if any key
327 * is utf8 (including 8 bit keys that were entered as utf8, and need upgrading
328 * when retrieved during iteration. It may still be set when there are no longer
330 * See HVhek_ENABLEHVKFLAGS for the trigger.
332 #define HvHASKFLAGS(hv) (SvFLAGS(hv) & SVphv_HASKFLAGS)
333 #define HvHASKFLAGS_on(hv) (SvFLAGS(hv) |= SVphv_HASKFLAGS)
334 #define HvHASKFLAGS_off(hv) (SvFLAGS(hv) &= ~SVphv_HASKFLAGS)
336 #define HvLAZYDEL(hv) (SvFLAGS(hv) & SVphv_LAZYDEL)
337 #define HvLAZYDEL_on(hv) (SvFLAGS(hv) |= SVphv_LAZYDEL)
338 #define HvLAZYDEL_off(hv) (SvFLAGS(hv) &= ~SVphv_LAZYDEL)
341 # define Nullhe Null(HE*)
343 #define HeNEXT(he) (he)->hent_next
344 #define HeKEY_hek(he) (he)->hent_hek
345 #define HeKEY(he) HEK_KEY(HeKEY_hek(he))
346 #define HeKEY_sv(he) (*(SV**)HeKEY(he))
347 #define HeKLEN(he) HEK_LEN(HeKEY_hek(he))
348 #define HeKUTF8(he) HEK_UTF8(HeKEY_hek(he))
349 #define HeKWASUTF8(he) HEK_WASUTF8(HeKEY_hek(he))
350 #define HeKLEN_UTF8(he) (HeKUTF8(he) ? -HeKLEN(he) : HeKLEN(he))
351 #define HeKFLAGS(he) HEK_FLAGS(HeKEY_hek(he))
352 #define HeVAL(he) (he)->he_valu.hent_val
353 #define HeHASH(he) HEK_HASH(HeKEY_hek(he))
354 #define HePV(he,lp) ((HeKLEN(he) == HEf_SVKEY) ? \
355 SvPV(HeKEY_sv(he),lp) : \
356 ((lp = HeKLEN(he)), HeKEY(he)))
357 #define HeUTF8(he) ((HeKLEN(he) == HEf_SVKEY) ? \
358 SvUTF8(HeKEY_sv(he)) : \
361 #define HeSVKEY(he) ((HeKEY(he) && \
362 HeKLEN(he) == HEf_SVKEY) ? \
365 #define HeSVKEY_force(he) (HeKEY(he) ? \
366 ((HeKLEN(he) == HEf_SVKEY) ? \
368 newSVpvn_flags(HeKEY(he), \
369 HeKLEN(he), SVs_TEMP)) : \
371 #define HeSVKEY_set(he,sv) ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv))
374 # define Nullhek Null(HEK*)
376 #define HEK_BASESIZE STRUCT_OFFSET(HEK, hek_key[0])
377 #define HEK_HASH(hek) (hek)->hek_hash
378 #define HEK_LEN(hek) (hek)->hek_len
379 #define HEK_KEY(hek) (hek)->hek_key
380 #define HEK_FLAGS(hek) (*((unsigned char *)(HEK_KEY(hek))+HEK_LEN(hek)+1))
382 #define HVhek_UTF8 0x01 /* Key is utf8 encoded. */
383 #define HVhek_WASUTF8 0x02 /* Key is bytes here, but was supplied as utf8. */
384 #define HVhek_UNSHARED 0x08 /* This key isn't a shared hash key. */
385 #define HVhek_FREEKEY 0x100 /* Internal flag to say key is malloc()ed. */
386 #define HVhek_PLACEHOLD 0x200 /* Internal flag to create placeholder.
387 * (may change, but Storable is a core module) */
388 #define HVhek_KEYCANONICAL 0x400 /* Internal flag - key is in canonical form.
389 If the string is UTF-8, it cannot be
390 converted to bytes. */
391 #define HVhek_MASK 0xFF
393 #define HVhek_ENABLEHVKFLAGS (HVhek_MASK & ~(HVhek_UNSHARED))
395 #define HEK_UTF8(hek) (HEK_FLAGS(hek) & HVhek_UTF8)
396 #define HEK_UTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_UTF8)
397 #define HEK_UTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_UTF8)
398 #define HEK_WASUTF8(hek) (HEK_FLAGS(hek) & HVhek_WASUTF8)
399 #define HEK_WASUTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_WASUTF8)
400 #define HEK_WASUTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_WASUTF8)
402 /* calculate HV array allocation */
403 #ifndef PERL_USE_LARGE_HV_ALLOC
404 /* Default to allocating the correct size - default to assuming that malloc()
405 is not broken and is efficient at allocating blocks sized at powers-of-two.
407 # define PERL_HV_ARRAY_ALLOC_BYTES(size) ((size) * sizeof(HE*))
409 # define MALLOC_OVERHEAD 16
410 # define PERL_HV_ARRAY_ALLOC_BYTES(size) \
412 ? (size) * sizeof(HE*) \
413 : (size) * sizeof(HE*) * 2 - MALLOC_OVERHEAD)
416 /* Flags for hv_iternext_flags. */
417 #define HV_ITERNEXT_WANTPLACEHOLDERS 0x01 /* Don't skip placeholders. */
419 #define hv_iternext(hv) hv_iternext_flags(hv, 0)
420 #define hv_magic(hv, gv, how) sv_magic(MUTABLE_SV(hv), MUTABLE_SV(gv), how, NULL, 0)
421 #define hv_undef(hv) Perl_hv_undef_flags(aTHX_ hv, 0)
423 #define Perl_sharepvn(pv, len, hash) HEK_KEY(share_hek(pv, len, hash))
424 #define sharepvn(pv, len, hash) Perl_sharepvn(pv, len, hash)
426 #define share_hek_hek(hek) \
427 (++(((struct shared_he *)(((char *)hek) \
428 - STRUCT_OFFSET(struct shared_he, \
430 ->shared_he_he.he_valu.hent_refcount), \
433 #define hv_store_ent(hv, keysv, val, hash) \
434 ((HE *) hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISSTORE, \
437 #define hv_exists_ent(hv, keysv, hash) \
438 (hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISEXISTS, 0, (hash)) \
440 #define hv_fetch_ent(hv, keysv, lval, hash) \
441 ((HE *) hv_common((hv), (keysv), NULL, 0, 0, \
442 ((lval) ? HV_FETCH_LVALUE : 0), NULL, (hash)))
443 #define hv_delete_ent(hv, key, flags, hash) \
444 (MUTABLE_SV(hv_common((hv), (key), NULL, 0, 0, (flags) | HV_DELETE, \
447 #define hv_store_flags(hv, key, klen, val, hash, flags) \
448 ((SV**) hv_common((hv), NULL, (key), (klen), (flags), \
449 (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), (val), \
452 #define hv_store(hv, key, klen, val, hash) \
453 ((SV**) hv_common_key_len((hv), (key), (klen), \
454 (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), \
457 #define hv_exists(hv, key, klen) \
458 (hv_common_key_len((hv), (key), (klen), HV_FETCH_ISEXISTS, NULL, 0) \
461 #define hv_fetch(hv, key, klen, lval) \
462 ((SV**) hv_common_key_len((hv), (key), (klen), (lval) \
463 ? (HV_FETCH_JUST_SV | HV_FETCH_LVALUE) \
464 : HV_FETCH_JUST_SV, NULL, 0))
466 #define hv_delete(hv, key, klen, flags) \
467 (MUTABLE_SV(hv_common_key_len((hv), (key), (klen), \
468 (flags) | HV_DELETE, NULL, 0)))
470 /* This refcounted he structure is used for storing the hints used for lexical
471 pragmas. Without threads, it's basically struct he + refcount.
472 With threads, life gets more complex as the structure needs to be shared
473 between threads (because it hangs from OPs, which are shared), hence the
474 alternate definition and mutex. */
476 struct refcounted_he;
478 /* flags for the refcounted_he API */
479 #define REFCOUNTED_HE_KEY_UTF8 0x00000001
481 # define REFCOUNTED_HE_EXISTS 0x00000002
486 /* Gosh. This really isn't a good name any longer. */
487 struct refcounted_he {
488 struct refcounted_he *refcounted_he_next; /* next entry in chain */
490 U32 refcounted_he_hash;
491 U32 refcounted_he_keylen;
493 HEK *refcounted_he_hek; /* hint key */
496 IV refcounted_he_u_iv;
497 UV refcounted_he_u_uv;
498 STRLEN refcounted_he_u_len;
499 void *refcounted_he_u_ptr; /* Might be useful in future */
501 U32 refcounted_he_refcnt; /* reference count */
502 /* First byte is flags. Then NUL-terminated value. Then for ithreads,
503 non-NUL terminated key. */
504 char refcounted_he_data[1];
508 =for apidoc m|SV *|refcounted_he_fetch_pvs|const struct refcounted_he *chain|const char *key|U32 flags
510 Like L</refcounted_he_fetch_pvn>, but takes a literal string instead of
511 a string/length pair, and no precomputed hash.
516 #define refcounted_he_fetch_pvs(chain, key, flags) \
517 Perl_refcounted_he_fetch_pvn(aTHX_ chain, STR_WITH_LEN(key), 0, flags)
520 =for apidoc m|struct refcounted_he *|refcounted_he_new_pvs|struct refcounted_he *parent|const char *key|SV *value|U32 flags
522 Like L</refcounted_he_new_pvn>, but takes a literal string instead of
523 a string/length pair, and no precomputed hash.
528 #define refcounted_he_new_pvs(parent, key, value, flags) \
529 Perl_refcounted_he_new_pvn(aTHX_ parent, STR_WITH_LEN(key), 0, value, flags)
531 /* Flag bits are HVhek_UTF8, HVhek_WASUTF8, then */
532 #define HVrhek_undef 0x00 /* Value is undef. */
533 #define HVrhek_delete 0x10 /* Value is placeholder - signifies delete. */
534 #define HVrhek_IV 0x20 /* Value is IV. */
535 #define HVrhek_UV 0x30 /* Value is UV. */
536 #define HVrhek_PV 0x40 /* Value is a (byte) string. */
537 #define HVrhek_PV_UTF8 0x50 /* Value is a (utf8) string. */
538 /* Two spare. As these have to live in the optree, you can't store anything
539 interpreter specific, such as SVs. :-( */
540 #define HVrhek_typemask 0x70
543 /* A big expression to find the key offset */
544 #define REF_HE_KEY(chain) \
545 ((((chain->refcounted_he_data[0] & 0x60) == 0x40) \
546 ? chain->refcounted_he_val.refcounted_he_u_len + 1 : 0) \
547 + 1 + chain->refcounted_he_data)
551 # define HINTS_REFCNT_LOCK MUTEX_LOCK(&PL_hints_mutex)
552 # define HINTS_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_hints_mutex)
554 # define HINTS_REFCNT_LOCK NOOP
555 # define HINTS_REFCNT_UNLOCK NOOP
560 # define HINTS_REFCNT_INIT MUTEX_INIT(&PL_hints_mutex)
561 # define HINTS_REFCNT_TERM MUTEX_DESTROY(&PL_hints_mutex)
563 # define HINTS_REFCNT_INIT NOOP
564 # define HINTS_REFCNT_TERM NOOP
568 * Passed in PERL_MAGIC_uvar calls
570 #define HV_DISABLE_UVAR_XKEY 0x01
571 /* We need to ensure that these don't clash with G_DISCARD, which is 2, as it
572 is documented as being passed to hv_delete(). */
573 #define HV_FETCH_ISSTORE 0x04
574 #define HV_FETCH_ISEXISTS 0x08
575 #define HV_FETCH_LVALUE 0x10
576 #define HV_FETCH_JUST_SV 0x20
577 #define HV_DELETE 0x40
578 #define HV_FETCH_EMPTY_HE 0x80 /* Leave HeVAL null. */
580 /* Must not conflict with HVhek_UTF8 */
581 #define HV_NAME_SETALL 0x02
586 Creates a new HV. The reference count is set to 1.
591 #define newHV() MUTABLE_HV(newSV_type(SVt_PVHV))
597 * c-indentation-style: bsd
599 * indent-tabs-mode: nil
602 * ex: set ts=8 sts=4 sw=4 et: