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 #ifdef PERL_USE_UNSHARED_KEYS_IN_LARGE_HASHES
32 #define LARGE_HASH_HEURISTIC(hv,new_max) S_large_hash_heuristic(aTHX_ (hv), (new_max))
34 #define LARGE_HASH_HEURISTIC(hv,new_max) 0
38 /* entry in hash value chain */
40 /* Keep hent_next first in this structure, because sv_free_arenas take
41 advantage of this to share code between the he arenas and the SV
43 HE *hent_next; /* next entry in chain */
44 HEK *hent_hek; /* hash key */
46 SV *hent_val; /* scalar value that was hashed */
47 Size_t hent_refcount; /* references for this shared hash key */
51 /* hash key -- defined separately for use as shared pointer */
53 U32 hek_hash; /* computed hash of key */
54 I32 hek_len; /* length of the hash key */
55 /* Be careful! Sometimes we store a pointer in the hek_key
56 * buffer, which means it must be 8 byte aligned or things
57 * dont work on aligned platforms like HPUX
58 * Also beware, the last byte of the hek_key buffer is a
59 * hidden flags byte about the key. */
60 char hek_key[1]; /* variable-length hash key */
61 /* the hash-key is \0-terminated */
62 /* after the \0 there is a byte for flags, such as whether the key
63 is UTF-8 or WAS-UTF-8, or an SV */
67 struct he shared_he_he;
68 struct hek shared_he_hek;
72 Don't access this directly.
73 Use the funcs in mro_core.c
77 AV *(*resolve)(pTHX_ HV* stash, U32 level);
80 U16 kflags; /* For the hash API - set HVhek_UTF8 if name is UTF-8 */
85 /* a hash holding the different MROs private data. */
87 /* a pointer directly to the current MROs private data. If mro_linear_all
88 is NULL, this owns the SV reference, else it is just a pointer to a
89 value stored in and owned by mro_linear_all. */
90 SV *mro_linear_current;
91 HV *mro_nextmethod; /* next::method caching */
92 U32 cache_gen; /* Bumping this invalidates our method cache */
93 U32 pkg_gen; /* Bumps when local methods/@ISA change */
94 const struct mro_alg *mro_which; /* which mro alg is in use? */
95 HV *isa; /* Everything this class @ISA */
96 HV *super; /* SUPER method cache */
97 CV *destroy; /* DESTROY method if destroy_gen non-zero */
98 U32 destroy_gen; /* Generation number of DESTROY cache */
101 #define MRO_GET_PRIVATE_DATA(smeta, which) \
102 (((smeta)->mro_which && (which) == (smeta)->mro_which) \
103 ? (smeta)->mro_linear_current \
104 : Perl_mro_get_private_data(aTHX_ (smeta), (which)))
106 /* Subject to change.
107 Don't access this directly.
111 HEK *xhvnameu_name; /* When xhv_name_count is 0 */
112 HEK **xhvnameu_names; /* When xhv_name_count is non-0 */
116 union _xhvnameu xhv_name_u; /* name, if a symbol table */
117 AV *xhv_backreferences; /* back references for weak references */
118 HE *xhv_eiter; /* current entry of iterator */
119 I32 xhv_riter; /* current root of iterator */
121 /* Concerning xhv_name_count: When non-zero, xhv_name_u contains a pointer
122 * to an array of HEK pointers, this being the length. The first element is
123 * the name of the stash, which may be NULL. If xhv_name_count is positive,
124 * then *xhv_name is one of the effective names. If xhv_name_count is nega-
125 * tive, then xhv_name_u.xhvnameu_names[1] is the first effective name.
128 struct mro_meta *xhv_mro_meta;
129 #ifdef PERL_HASH_RANDOMIZE_KEYS
130 U32 xhv_rand; /* random value for hash traversal */
131 U32 xhv_last_rand; /* last random value for hash traversal,
132 used to detect each() after insert for warnings */
134 U32 xhv_aux_flags; /* assorted extra flags */
137 #define HvAUXf_SCAN_STASH 0x1 /* stash is being scanned by gv_check */
138 #define HvAUXf_NO_DEREF 0x2 /* @{}, %{} etc (and nomethod) not present */
140 /* hash structure: */
141 /* This structure must match the beginning of struct xpvmg in sv.h. */
143 HV* xmg_stash; /* class package */
145 STRLEN xhv_keys; /* total keys, including placeholders */
146 STRLEN xhv_max; /* subscript of last element of xhv_array */
149 struct xpvhv_with_aux {
150 HV *xmg_stash; /* class package */
152 STRLEN xhv_keys; /* total keys, including placeholders */
153 STRLEN xhv_max; /* subscript of last element of xhv_array */
154 struct xpvhv_aux xhv_aux;
158 =for apidoc AmnU||HEf_SVKEY
159 This flag, used in the length slot of hash entries and magic structures,
160 specifies the structure contains an C<SV*> pointer where a C<char*> pointer
161 is to be expected. (For information only--not to be used).
163 =for apidoc ADmnU||Nullhv
166 (deprecated - use C<(HV *)NULL> instead)
168 =for apidoc Am|char*|HvNAME|HV* stash
169 Returns the package name of a stash, or C<NULL> if C<stash> isn't a stash.
170 See C<L</SvSTASH>>, C<L</CvSTASH>>.
172 =for apidoc Am|STRLEN|HvNAMELEN|HV *stash
173 Returns the length of the stash's name.
175 Disfavored forms of HvNAME and HvNAMELEN; suppress mention of them
176 =for apidoc Cmh|char*|HvNAME_get|HV* stash
177 =for apidoc Amh|I32|HvNAMELEN_get|HV* stash
179 =for apidoc Am|unsigned char|HvNAMEUTF8|HV *stash
180 Returns true if the name is in UTF-8 encoding.
182 =for apidoc Am|char*|HvENAME|HV* stash
183 Returns the effective name of a stash, or NULL if there is none. The
184 effective name represents a location in the symbol table where this stash
185 resides. It is updated automatically when packages are aliased or deleted.
186 A stash that is no longer in the symbol table has no effective name. This
187 name is preferable to C<HvNAME> for use in MRO linearisations and isa
190 =for apidoc Am|STRLEN|HvENAMELEN|HV *stash
191 Returns the length of the stash's effective name.
193 =for apidoc Am|unsigned char|HvENAMEUTF8|HV *stash
194 Returns true if the effective name is in UTF-8 encoding.
196 =for apidoc Am|void*|HeKEY|HE* he
197 Returns the actual pointer stored in the key slot of the hash entry. The
198 pointer may be either C<char*> or C<SV*>, depending on the value of
199 C<HeKLEN()>. Can be assigned to. The C<HePV()> or C<HeSVKEY()> macros are
200 usually preferable for finding the value of a key.
202 =for apidoc Am|STRLEN|HeKLEN|HE* he
203 If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry
204 holds an C<SV*> key. Otherwise, holds the actual length of the key. Can
205 be assigned to. The C<HePV()> macro is usually preferable for finding key
208 =for apidoc Am|SV*|HeVAL|HE* he
209 Returns the value slot (type C<SV*>)
210 stored in the hash entry. Can be assigned
217 =for apidoc Am|U32|HeHASH|HE* he
218 Returns the computed hash stored in the hash entry.
220 =for apidoc Am|char*|HePV|HE* he|STRLEN len
221 Returns the key slot of the hash entry as a C<char*> value, doing any
222 necessary dereferencing of possibly C<SV*> keys. The length of the string
223 is placed in C<len> (this is a macro, so do I<not> use C<&len>). If you do
224 not care about what the length of the key is, you may use the global
225 variable C<PL_na>, though this is rather less efficient than using a local
226 variable. Remember though, that hash keys in perl are free to contain
227 embedded nulls, so using C<strlen()> or similar is not a good way to find
228 the length of hash keys. This is very similar to the C<SvPV()> macro
229 described elsewhere in this document. See also C<L</HeUTF8>>.
231 If you are using C<HePV> to get values to pass to C<newSVpvn()> to create a
232 new SV, you should consider using C<newSVhek(HeKEY_hek(he))> as it is more
235 =for apidoc Am|U32|HeUTF8|HE* he
236 Returns whether the C<char *> value returned by C<HePV> is encoded in UTF-8,
237 doing any necessary dereferencing of possibly C<SV*> keys. The value returned
238 will be 0 or non-0, not necessarily 1 (or even a value with any low bits set),
239 so B<do not> blindly assign this to a C<bool> variable, as C<bool> may be a
242 =for apidoc Am|SV*|HeSVKEY|HE* he
243 Returns the key as an C<SV*>, or C<NULL> if the hash entry does not
244 contain an C<SV*> key.
246 =for apidoc Am|SV*|HeSVKEY_force|HE* he
247 Returns the key as an C<SV*>. Will create and return a temporary mortal
248 C<SV*> if the hash entry contains only a C<char*> key.
250 =for apidoc Am|SV*|HeSVKEY_set|HE* he|SV* sv
251 Sets the key to a given C<SV*>, taking care to set the appropriate flags to
252 indicate the presence of an C<SV*> key, and returns the same
258 #define PERL_HASH_DEFAULT_HvMAX 7
260 /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */
261 #define HEf_SVKEY -2 /* hent_key is an SV* */
264 # define Nullhv Null(HV*)
266 #define HvARRAY(hv) ((hv)->sv_u.svu_hash)
270 =for apidoc Am|STRLEN|HvFILL|HV *const hv
272 Returns the number of hash buckets that happen to be in use.
274 As of perl 5.25 this function is used only for debugging
275 purposes, and the number of used hash buckets is not
276 in any way cached, thus this function can be costly
277 to execute as it must iterate over all the buckets in the
284 #define HvFILL(hv) Perl_hv_fill(aTHX_ MUTABLE_HV(hv))
285 #define HvMAX(hv) ((XPVHV*) SvANY(hv))->xhv_max
289 =for apidoc Am|bool|HvHasAUX|HV *const hv
291 Returns true if the HV has a C<struct xpvhv_aux> extension. Use this to check
292 whether it is valid to call C<HvAUX()>.
297 #define HvHasAUX(hv) (SvFLAGS(hv) & SVphv_HasAUX)
299 /* This quite intentionally does no flag checking first. That's your
300 responsibility. Use HvHasAUX() first */
301 #define HvAUX(hv) (&(((struct xpvhv_with_aux*) SvANY(hv))->xhv_aux))
302 #define HvRITER(hv) (*Perl_hv_riter_p(aTHX_ MUTABLE_HV(hv)))
303 #define HvEITER(hv) (*Perl_hv_eiter_p(aTHX_ MUTABLE_HV(hv)))
304 #define HvRITER_set(hv,r) Perl_hv_riter_set(aTHX_ MUTABLE_HV(hv), r)
305 #define HvEITER_set(hv,e) Perl_hv_eiter_set(aTHX_ MUTABLE_HV(hv), e)
306 #define HvRITER_get(hv) (HvHasAUX(hv) ? HvAUX(hv)->xhv_riter : -1)
307 #define HvEITER_get(hv) (HvHasAUX(hv) ? HvAUX(hv)->xhv_eiter : NULL)
308 #define HvRAND_get(hv) (HvHasAUX(hv) ? HvAUX(hv)->xhv_rand : 0)
309 #define HvLASTRAND_get(hv) (HvHasAUX(hv) ? HvAUX(hv)->xhv_last_rand : 0)
311 #define HvNAME(hv) HvNAME_get(hv)
312 #define HvNAMELEN(hv) HvNAMELEN_get(hv)
313 #define HvENAME(hv) HvENAME_get(hv)
314 #define HvENAMELEN(hv) HvENAMELEN_get(hv)
316 /* Checking that hv is a valid package stash is the
317 caller's responsibility */
318 #define HvMROMETA(hv) (HvAUX(hv)->xhv_mro_meta \
319 ? HvAUX(hv)->xhv_mro_meta \
320 : Perl_mro_meta_init(aTHX_ hv))
322 #define HvNAME_HEK_NN(hv) \
324 HvAUX(hv)->xhv_name_count \
325 ? *HvAUX(hv)->xhv_name_u.xhvnameu_names \
326 : HvAUX(hv)->xhv_name_u.xhvnameu_name \
328 /* This macro may go away without notice. */
329 #define HvNAME_HEK(hv) \
330 (HvHasAUX(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name ? HvNAME_HEK_NN(hv) : NULL)
331 #define HvHasNAME(hv) \
332 (HvHasAUX(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv))
333 #define HvNAME_get(hv) \
334 (HvHasNAME(hv) ? HEK_KEY(HvNAME_HEK_NN(hv)) : NULL)
335 #define HvNAMELEN_get(hv) \
336 ((HvHasAUX(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
337 ? HEK_LEN(HvNAME_HEK_NN(hv)) : 0)
338 #define HvNAMEUTF8(hv) \
339 ((HvHasAUX(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
340 ? HEK_UTF8(HvNAME_HEK_NN(hv)) : 0)
341 #define HvENAME_HEK_NN(hv) \
343 HvAUX(hv)->xhv_name_count > 0 ? HvAUX(hv)->xhv_name_u.xhvnameu_names[0] : \
344 HvAUX(hv)->xhv_name_count < -1 ? HvAUX(hv)->xhv_name_u.xhvnameu_names[1] : \
345 HvAUX(hv)->xhv_name_count == -1 ? NULL : \
346 HvAUX(hv)->xhv_name_u.xhvnameu_name \
348 #define HvHasENAME_HEK(hv) \
349 (HvHasAUX(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name)
350 #define HvENAME_HEK(hv) \
351 (HvHasENAME_HEK(hv) ? HvENAME_HEK_NN(hv) : NULL)
352 #define HvHasENAME(hv) \
353 (HvHasENAME_HEK(hv) && HvAUX(hv)->xhv_name_count != -1)
354 #define HvENAME_get(hv) \
355 (HvHasENAME(hv) ? HEK_KEY(HvENAME_HEK_NN(hv)) : NULL)
356 #define HvENAMELEN_get(hv) \
357 (HvHasENAME(hv) ? HEK_LEN(HvENAME_HEK_NN(hv)) : 0)
358 #define HvENAMEUTF8(hv) \
359 (HvHasENAME(hv) ? HEK_UTF8(HvENAME_HEK_NN(hv)) : 0)
362 * HvKEYS gets the number of keys that actually exist(), and is provided
363 * for backwards compatibility with old XS code. The core uses HvUSEDKEYS
364 * (keys, excluding placeholders) and HvTOTALKEYS (including placeholders)
366 #define HvKEYS(hv) HvUSEDKEYS(hv)
367 #define HvUSEDKEYS(hv) (HvTOTALKEYS(hv) - HvPLACEHOLDERS_get(hv))
368 #define HvTOTALKEYS(hv) (((XPVHV*) SvANY(hv))->xhv_keys)
369 #define HvPLACEHOLDERS(hv) (*Perl_hv_placeholders_p(aTHX_ MUTABLE_HV(hv)))
370 #define HvPLACEHOLDERS_get(hv) (SvMAGIC(hv) ? Perl_hv_placeholders_get(aTHX_ (const HV *)hv) : 0)
371 #define HvPLACEHOLDERS_set(hv,p) Perl_hv_placeholders_set(aTHX_ MUTABLE_HV(hv), p)
373 /* This (now) flags whether *new* keys in the hash will be allocated from the
374 * shared string table. We have a heuristic to call HvSHAREKEYS_off() if a hash
375 * is "getting large". After which, the first keys in that hash will be from
376 * the shared string table, but subsequent keys will not be.
378 * If we didn't do this, we'd have to reallocate all keys when we switched this
379 * flag, which would be work for no real gain. */
380 #define HvSHAREKEYS(hv) (SvFLAGS(hv) & SVphv_SHAREKEYS)
381 #define HvSHAREKEYS_on(hv) (SvFLAGS(hv) |= SVphv_SHAREKEYS)
382 #define HvSHAREKEYS_off(hv) (SvFLAGS(hv) &= ~SVphv_SHAREKEYS)
384 /* This is an optimisation flag. It won't be set if all hash keys have a 0
385 * flag. Currently the only flags relate to utf8.
386 * Hence it won't be set if all keys are 8 bit only. It will be set if any key
387 * is utf8 (including 8 bit keys that were entered as utf8, and need upgrading
388 * when retrieved during iteration. It may still be set when there are no longer
390 * See HVhek_ENABLEHVKFLAGS for the trigger.
392 #define HvHASKFLAGS(hv) (SvFLAGS(hv) & SVphv_HASKFLAGS)
393 #define HvHASKFLAGS_on(hv) (SvFLAGS(hv) |= SVphv_HASKFLAGS)
394 #define HvHASKFLAGS_off(hv) (SvFLAGS(hv) &= ~SVphv_HASKFLAGS)
396 #define HvLAZYDEL(hv) (SvFLAGS(hv) & SVphv_LAZYDEL)
397 #define HvLAZYDEL_on(hv) (SvFLAGS(hv) |= SVphv_LAZYDEL)
398 #define HvLAZYDEL_off(hv) (SvFLAGS(hv) &= ~SVphv_LAZYDEL)
401 # define Nullhe Null(HE*)
403 #define HeNEXT(he) (he)->hent_next
404 #define HeKEY_hek(he) (he)->hent_hek
405 #define HeKEY(he) HEK_KEY(HeKEY_hek(he))
406 #define HeKEY_sv(he) (*(SV**)HeKEY(he))
407 #define HeKLEN(he) HEK_LEN(HeKEY_hek(he))
408 #define HeKUTF8(he) HEK_UTF8(HeKEY_hek(he))
409 #define HeKWASUTF8(he) HEK_WASUTF8(HeKEY_hek(he))
410 #define HeKLEN_UTF8(he) (HeKUTF8(he) ? -HeKLEN(he) : HeKLEN(he))
411 #define HeKFLAGS(he) HEK_FLAGS(HeKEY_hek(he))
412 #define HeVAL(he) (he)->he_valu.hent_val
413 #define HeHASH(he) HEK_HASH(HeKEY_hek(he))
414 #define HePV(he,lp) ((HeKLEN(he) == HEf_SVKEY) ? \
415 SvPV(HeKEY_sv(he),lp) : \
416 ((lp = HeKLEN(he)), HeKEY(he)))
417 #define HeUTF8(he) ((HeKLEN(he) == HEf_SVKEY) ? \
418 SvUTF8(HeKEY_sv(he)) : \
421 #define HeSVKEY(he) ((HeKEY(he) && \
422 HeKLEN(he) == HEf_SVKEY) ? \
425 #define HeSVKEY_force(he) (HeKEY(he) ? \
426 ((HeKLEN(he) == HEf_SVKEY) ? \
428 newSVpvn_flags(HeKEY(he), \
431 ( HeKUTF8(he) ? SVf_UTF8 : 0 ))) : \
433 #define HeSVKEY_set(he,sv) ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv))
436 # define Nullhek Null(HEK*)
438 #define HEK_BASESIZE STRUCT_OFFSET(HEK, hek_key[0])
439 #define HEK_HASH(hek) (hek)->hek_hash
440 #define HEK_LEN(hek) (hek)->hek_len
441 #define HEK_KEY(hek) (hek)->hek_key
442 #define HEK_FLAGS(hek) (*((unsigned char *)(HEK_KEY(hek))+HEK_LEN(hek)+1))
444 #define HVhek_UTF8 0x01 /* Key is utf8 encoded. */
445 #define HVhek_WASUTF8 0x02 /* Key is bytes here, but was supplied as utf8. */
446 #define HVhek_NOTSHARED 0x04 /* This key isn't a shared hash key. */
447 /* the following flags are options for functions, they are not stored in heks */
448 #define HVhek_FREEKEY 0x100 /* Internal flag to say key is Newx()ed. */
449 #define HVhek_PLACEHOLD 0x200 /* Internal flag to create placeholder.
450 * (may change, but Storable is a core module) */
451 #define HVhek_KEYCANONICAL 0x400 /* Internal flag - key is in canonical form.
452 If the string is UTF-8, it cannot be
453 converted to bytes. */
454 #define HVhek_ENABLEHVKFLAGS (HVhek_UTF8|HVhek_WASUTF8)
456 #define HEK_UTF8(hek) (HEK_FLAGS(hek) & HVhek_UTF8)
457 #define HEK_UTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_UTF8)
458 #define HEK_UTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_UTF8)
459 #define HEK_WASUTF8(hek) (HEK_FLAGS(hek) & HVhek_WASUTF8)
460 #define HEK_WASUTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_WASUTF8)
461 #define HEK_WASUTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_WASUTF8)
463 /* calculate HV array allocation */
464 #ifndef PERL_USE_LARGE_HV_ALLOC
465 /* Default to allocating the correct size - default to assuming that malloc()
466 is not broken and is efficient at allocating blocks sized at powers-of-two.
468 # define PERL_HV_ARRAY_ALLOC_BYTES(size) ((size) * sizeof(HE*))
470 # define MALLOC_OVERHEAD 16
471 # define PERL_HV_ARRAY_ALLOC_BYTES(size) \
473 ? (size) * sizeof(HE*) \
474 : (size) * sizeof(HE*) * 2 - MALLOC_OVERHEAD)
477 /* Flags for hv_iternext_flags. */
478 #define HV_ITERNEXT_WANTPLACEHOLDERS 0x01 /* Don't skip placeholders. */
480 #define hv_iternext(hv) hv_iternext_flags(hv, 0)
481 #define hv_magic(hv, gv, how) sv_magic(MUTABLE_SV(hv), MUTABLE_SV(gv), how, NULL, 0)
482 #define hv_undef(hv) Perl_hv_undef_flags(aTHX_ hv, 0)
484 #define Perl_sharepvn(pv, len, hash) HEK_KEY(share_hek(pv, len, hash))
485 #define sharepvn(pv, len, hash) Perl_sharepvn(pv, len, hash)
487 #define share_hek_hek(hek) \
488 (++(((struct shared_he *)(((char *)hek) \
489 - STRUCT_OFFSET(struct shared_he, \
491 ->shared_he_he.he_valu.hent_refcount), \
494 #define hv_store_ent(hv, keysv, val, hash) \
495 ((HE *) hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISSTORE, \
498 #define hv_exists_ent(hv, keysv, hash) \
499 cBOOL(hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISEXISTS, 0, (hash)))
500 #define hv_fetch_ent(hv, keysv, lval, hash) \
501 ((HE *) hv_common((hv), (keysv), NULL, 0, 0, \
502 ((lval) ? HV_FETCH_LVALUE : 0), NULL, (hash)))
503 #define hv_delete_ent(hv, key, flags, hash) \
504 (MUTABLE_SV(hv_common((hv), (key), NULL, 0, 0, (flags) | HV_DELETE, \
507 #define hv_store_flags(hv, key, klen, val, hash, flags) \
508 ((SV**) hv_common((hv), NULL, (key), (klen), (flags), \
509 (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), (val), \
512 #define hv_store(hv, key, klen, val, hash) \
513 ((SV**) hv_common_key_len((hv), (key), (klen), \
514 (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), \
519 #define hv_exists(hv, key, klen) \
520 cBOOL(hv_common_key_len((hv), (key), (klen), HV_FETCH_ISEXISTS, NULL, 0))
522 #define hv_fetch(hv, key, klen, lval) \
523 ((SV**) hv_common_key_len((hv), (key), (klen), (lval) \
524 ? (HV_FETCH_JUST_SV | HV_FETCH_LVALUE) \
525 : HV_FETCH_JUST_SV, NULL, 0))
527 #define hv_delete(hv, key, klen, flags) \
528 (MUTABLE_SV(hv_common_key_len((hv), (key), (klen), \
529 (flags) | HV_DELETE, NULL, 0)))
531 /* Provide 's' suffix subs for constant strings (and avoid needing to count
532 * chars). See STR_WITH_LEN in handy.h - because these are macros we cant use
533 * STR_WITH_LEN to do the work, we have to unroll it. */
534 #define hv_existss(hv, key) \
535 hv_exists((hv), ASSERT_IS_LITERAL(key), (sizeof(key)-1))
537 #define hv_fetchs(hv, key, lval) \
538 hv_fetch((hv), ASSERT_IS_LITERAL(key), (sizeof(key)-1), (lval))
540 #define hv_deletes(hv, key, flags) \
541 hv_delete((hv), ASSERT_IS_LITERAL(key), (sizeof(key)-1), (flags))
543 #define hv_name_sets(hv, name, flags) \
544 hv_name_set((hv),ASSERT_IS_LITERAL(name),(sizeof(name)-1), flags)
546 #define hv_stores(hv, key, val) \
547 hv_store((hv), ASSERT_IS_LITERAL(key), (sizeof(key)-1), (val), 0)
550 # define hv_storehek(hv, hek, val) \
551 hv_common((hv), NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_UTF8(hek), \
552 HV_FETCH_ISSTORE|HV_FETCH_JUST_SV, (val), HEK_HASH(hek))
553 # define hv_fetchhek(hv, hek, lval) \
555 hv_common((hv), NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_UTF8(hek), \
557 ? (HV_FETCH_JUST_SV | HV_FETCH_LVALUE) \
558 : HV_FETCH_JUST_SV, \
559 NULL, HEK_HASH(hek)))
560 # define hv_deletehek(hv, hek, flags) \
561 hv_common((hv), NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_UTF8(hek), \
562 (flags)|HV_DELETE, NULL, HEK_HASH(hek))
563 #define hv_existshek(hv, hek) \
564 cBOOL(hv_common((hv), NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_UTF8(hek), \
565 HV_FETCH_ISEXISTS, NULL, HEK_HASH(hek)))
568 /* This refcounted he structure is used for storing the hints used for lexical
569 pragmas. Without threads, it's basically struct he + refcount.
570 With threads, life gets more complex as the structure needs to be shared
571 between threads (because it hangs from OPs, which are shared), hence the
572 alternate definition and mutex. */
574 struct refcounted_he;
576 /* flags for the refcounted_he API */
577 #define REFCOUNTED_HE_KEY_UTF8 0x00000001
578 #define REFCOUNTED_HE_EXISTS 0x00000002
582 /* Gosh. This really isn't a good name any longer. */
583 struct refcounted_he {
584 struct refcounted_he *refcounted_he_next; /* next entry in chain */
586 U32 refcounted_he_hash;
587 U32 refcounted_he_keylen;
589 HEK *refcounted_he_hek; /* hint key */
592 IV refcounted_he_u_iv;
593 UV refcounted_he_u_uv;
594 STRLEN refcounted_he_u_len;
595 void *refcounted_he_u_ptr; /* Might be useful in future */
597 U32 refcounted_he_refcnt; /* reference count */
598 /* First byte is flags. Then NUL-terminated value. Then for ithreads,
599 non-NUL terminated key. */
600 char refcounted_he_data[1];
604 =for apidoc m|SV *|refcounted_he_fetch_pvs|const struct refcounted_he *chain|"key"|U32 flags
606 Like L</refcounted_he_fetch_pvn>, but takes a literal string
607 instead of a string/length pair, and no precomputed hash.
612 #define refcounted_he_fetch_pvs(chain, key, flags) \
613 Perl_refcounted_he_fetch_pvn(aTHX_ chain, STR_WITH_LEN(key), 0, flags)
616 =for apidoc m|struct refcounted_he *|refcounted_he_new_pvs|struct refcounted_he *parent|"key"|SV *value|U32 flags
618 Like L</refcounted_he_new_pvn>, but takes a literal string
619 instead of a string/length pair, and no precomputed hash.
624 #define refcounted_he_new_pvs(parent, key, value, flags) \
625 Perl_refcounted_he_new_pvn(aTHX_ parent, STR_WITH_LEN(key), 0, value, flags)
627 /* Flag bits are HVhek_UTF8, HVhek_WASUTF8, then */
628 #define HVrhek_undef 0x00 /* Value is undef. */
629 #define HVrhek_delete 0x10 /* Value is placeholder - signifies delete. */
630 #define HVrhek_IV 0x20 /* Value is IV. */
631 #define HVrhek_UV 0x30 /* Value is UV. */
632 #define HVrhek_PV 0x40 /* Value is a (byte) string. */
633 #define HVrhek_PV_UTF8 0x50 /* Value is a (utf8) string. */
634 /* Two spare. As these have to live in the optree, you can't store anything
635 interpreter specific, such as SVs. :-( */
636 #define HVrhek_typemask 0x70
639 /* A big expression to find the key offset */
640 #define REF_HE_KEY(chain) \
641 ((((chain->refcounted_he_data[0] & 0x60) == 0x40) \
642 ? chain->refcounted_he_val.refcounted_he_u_len + 1 : 0) \
643 + 1 + chain->refcounted_he_data)
647 # define HINTS_REFCNT_LOCK MUTEX_LOCK(&PL_hints_mutex)
648 # define HINTS_REFCNT_UNLOCK MUTEX_UNLOCK(&PL_hints_mutex)
650 # define HINTS_REFCNT_LOCK NOOP
651 # define HINTS_REFCNT_UNLOCK NOOP
656 # define HINTS_REFCNT_INIT MUTEX_INIT(&PL_hints_mutex)
657 # define HINTS_REFCNT_TERM MUTEX_DESTROY(&PL_hints_mutex)
659 # define HINTS_REFCNT_INIT NOOP
660 # define HINTS_REFCNT_TERM NOOP
664 * Passed in PERL_MAGIC_uvar calls
666 #define HV_DISABLE_UVAR_XKEY 0x01
667 /* We need to ensure that these don't clash with G_DISCARD, which is 2, as it
668 is documented as being passed to hv_delete(). */
669 #define HV_FETCH_ISSTORE 0x04
670 #define HV_FETCH_ISEXISTS 0x08
671 #define HV_FETCH_LVALUE 0x10
672 #define HV_FETCH_JUST_SV 0x20
673 #define HV_DELETE 0x40
674 #define HV_FETCH_EMPTY_HE 0x80 /* Leave HeVAL null. */
676 /* Must not conflict with HVhek_UTF8 */
677 #define HV_NAME_SETALL 0x02
682 Creates a new HV. The reference count is set to 1.
687 #define newHV() MUTABLE_HV(newSV_type(SVt_PVHV))
692 * ex: set ts=8 sts=4 sw=4 et: