summaryrefslogtreecommitdiff
path: root/hv.h
blob: 0e773f2020f6618ac43172a5c8cd56951a3e576d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
/*    hv.h
 *
 *    Copyright (C) 1991, 1992, 1993, 1996, 1997, 1998, 1999,
 *    2000, 2001, 2002, 2003, 2005, 2006, 2007, 2008, by Larry Wall and others
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 */

/* These control hash traversal randomization and the environment variable PERL_PERTURB_KEYS.
 * Currently disabling this functionality will break a few tests, but should otherwise work fine.
 * See perlrun for more details. */

#if defined(PERL_PERTURB_KEYS_DISABLED)
#   define PL_HASH_RAND_BITS_ENABLED        0
#   define PERL_HASH_ITER_BUCKET(iter)      ((iter)->xhv_riter)
#else
#   define PERL_HASH_RANDOMIZE_KEYS         1
#   if defined(PERL_PERTURB_KEYS_RANDOM)
#       define PL_HASH_RAND_BITS_ENABLED    1
#   elif defined(PERL_PERTURB_KEYS_DETERMINISTIC)
#       define PL_HASH_RAND_BITS_ENABLED    2
#   else
#       define USE_PERL_PERTURB_KEYS        1
#       define PL_HASH_RAND_BITS_ENABLED    PL_hash_rand_bits_enabled
#   endif
#   define PERL_HASH_ITER_BUCKET(iter)      (((iter)->xhv_riter) ^ ((iter)->xhv_rand))
#endif

/* entry in hash value chain */
struct he {
    /* Keep hent_next first in this structure, because sv_free_arenas take
       advantage of this to share code between the he arenas and the SV
       body arenas  */
    HE		*hent_next;	/* next entry in chain */
    HEK		*hent_hek;	/* hash key */
    union {
	SV	*hent_val;	/* scalar value that was hashed */
	Size_t	hent_refcount;	/* references for this shared hash key */
    } he_valu;
};

/* hash key -- defined separately for use as shared pointer */
struct hek {
    U32		hek_hash;	/* hash of key */
    I32		hek_len;	/* length of hash key */
    char	hek_key[1];	/* variable-length hash key */
    /* the hash-key is \0-terminated */
    /* after the \0 there is a byte for flags, such as whether the key
       is UTF-8 */
};

struct shared_he {
    struct he shared_he_he;
    struct hek shared_he_hek;
};

/* Subject to change.
   Don't access this directly.
   Use the funcs in mro_core.c
*/

struct mro_alg {
    AV *(*resolve)(pTHX_ HV* stash, U32 level);
    const char *name;
    U16 length;
    U16	kflags;	/* For the hash API - set HVhek_UTF8 if name is UTF-8 */
    U32 hash; /* or 0 */
};

struct mro_meta {
    /* a hash holding the different MROs private data.  */
    HV      *mro_linear_all;
    /* a pointer directly to the current MROs private data.  If mro_linear_all
       is NULL, this owns the SV reference, else it is just a pointer to a
       value stored in and owned by mro_linear_all.  */
    SV      *mro_linear_current;
    HV      *mro_nextmethod; /* next::method caching */
    U32     cache_gen;       /* Bumping this invalidates our method cache */
    U32     pkg_gen;         /* Bumps when local methods/@ISA change */
    const struct mro_alg *mro_which; /* which mro alg is in use? */
    HV      *isa;            /* Everything this class @ISA */
    HV      *super;          /* SUPER method cache */
    CV      *destroy;        /* DESTROY method if destroy_gen non-zero */
    U32     destroy_gen;     /* Generation number of DESTROY cache */
};

#define MRO_GET_PRIVATE_DATA(smeta, which)		   \
    (((smeta)->mro_which && (which) == (smeta)->mro_which) \
     ? (smeta)->mro_linear_current			   \
     : Perl_mro_get_private_data(aTHX_ (smeta), (which)))

/* Subject to change.
   Don't access this directly.
*/

union _xhvnameu {
    HEK *xhvnameu_name;		/* When xhv_name_count is 0 */
    HEK **xhvnameu_names;	/* When xhv_name_count is non-0 */
};

struct xpvhv_aux {
    union _xhvnameu xhv_name_u;	/* name, if a symbol table */
    AV		*xhv_backreferences; /* back references for weak references */
    HE		*xhv_eiter;	/* current entry of iterator */
    I32		xhv_riter;	/* current root of iterator */

/* Concerning xhv_name_count: When non-zero, xhv_name_u contains a pointer 
 * to an array of HEK pointers, this being the length. The first element is
 * the name of the stash, which may be NULL. If xhv_name_count is positive,
 * then *xhv_name is one of the effective names. If xhv_name_count is nega-
 * tive, then xhv_name_u.xhvnameu_names[1] is the first effective name.
 */
    I32		xhv_name_count;
    struct mro_meta *xhv_mro_meta;
#ifdef PERL_HASH_RANDOMIZE_KEYS
    U32         xhv_rand;       /* random value for hash traversal */
    U32         xhv_last_rand;  /* last random value for hash traversal,
                                   used to detect each() after insert for warnings */
#endif
    U32         xhv_aux_flags;      /* assorted extra flags */
};

#define HvAUXf_SCAN_STASH   0x1   /* stash is being scanned by gv_check */
#define HvAUXf_NO_DEREF     0x2   /* @{}, %{} etc (and nomethod) not present */

/* hash structure: */
/* This structure must match the beginning of struct xpvmg in sv.h. */
struct xpvhv {
    HV*		xmg_stash;	/* class package */
    union _xmgu	xmg_u;
    STRLEN      xhv_keys;       /* total keys, including placeholders */
    STRLEN      xhv_max;        /* subscript of last element of xhv_array */
};

/*
=head1 Hash Manipulation Functions

=for apidoc AmU||HEf_SVKEY
This flag, used in the length slot of hash entries and magic structures,
specifies the structure contains an C<SV*> pointer where a C<char*> pointer
is to be expected.  (For information only--not to be used).

=head1 Handy Values

=for apidoc AmU||Nullhv
Null HV pointer.

(deprecated - use C<(HV *)NULL> instead)

=head1 Hash Manipulation Functions

=for apidoc Am|char*|HvNAME|HV* stash
Returns the package name of a stash, or C<NULL> if C<stash> isn't a stash.
See C<L</SvSTASH>>, C<L</CvSTASH>>.

=for apidoc Am|STRLEN|HvNAMELEN|HV *stash
Returns the length of the stash's name.

=for apidoc Am|unsigned char|HvNAMEUTF8|HV *stash
Returns true if the name is in UTF-8 encoding.

=for apidoc Am|char*|HvENAME|HV* stash
Returns the effective name of a stash, or NULL if there is none.  The
effective name represents a location in the symbol table where this stash
resides.  It is updated automatically when packages are aliased or deleted.
A stash that is no longer in the symbol table has no effective name.  This
name is preferable to C<HvNAME> for use in MRO linearisations and isa
caches.

=for apidoc Am|STRLEN|HvENAMELEN|HV *stash
Returns the length of the stash's effective name.

=for apidoc Am|unsigned char|HvENAMEUTF8|HV *stash
Returns true if the effective name is in UTF-8 encoding.

=for apidoc Am|void*|HeKEY|HE* he
Returns the actual pointer stored in the key slot of the hash entry.  The
pointer may be either C<char*> or C<SV*>, depending on the value of
C<HeKLEN()>.  Can be assigned to.  The C<HePV()> or C<HeSVKEY()> macros are
usually preferable for finding the value of a key.

=for apidoc Am|STRLEN|HeKLEN|HE* he
If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry
holds an C<SV*> key.  Otherwise, holds the actual length of the key.  Can
be assigned to.  The C<HePV()> macro is usually preferable for finding key
lengths.

=for apidoc Am|SV*|HeVAL|HE* he
Returns the value slot (type C<SV*>)
stored in the hash entry.  Can be assigned
to.

  SV *foo= HeVAL(hv);
  HeVAL(hv)= sv;


=for apidoc Am|U32|HeHASH|HE* he
Returns the computed hash stored in the hash entry.

=for apidoc Am|char*|HePV|HE* he|STRLEN len
Returns the key slot of the hash entry as a C<char*> value, doing any
necessary dereferencing of possibly C<SV*> keys.  The length of the string
is placed in C<len> (this is a macro, so do I<not> use C<&len>).  If you do
not care about what the length of the key is, you may use the global
variable C<PL_na>, though this is rather less efficient than using a local
variable.  Remember though, that hash keys in perl are free to contain
embedded nulls, so using C<strlen()> or similar is not a good way to find
the length of hash keys.  This is very similar to the C<SvPV()> macro
described elsewhere in this document.  See also C<L</HeUTF8>>.

If you are using C<HePV> to get values to pass to C<newSVpvn()> to create a
new SV, you should consider using C<newSVhek(HeKEY_hek(he))> as it is more
efficient.

=for apidoc Am|U32|HeUTF8|HE* he
Returns whether the C<char *> value returned by C<HePV> is encoded in UTF-8,
doing any necessary dereferencing of possibly C<SV*> keys.  The value returned
will be 0 or non-0, not necessarily 1 (or even a value with any low bits set),
so B<do not> blindly assign this to a C<bool> variable, as C<bool> may be a
typedef for C<char>.

=for apidoc Am|SV*|HeSVKEY|HE* he
Returns the key as an C<SV*>, or C<NULL> if the hash entry does not
contain an C<SV*> key.

=for apidoc Am|SV*|HeSVKEY_force|HE* he
Returns the key as an C<SV*>.  Will create and return a temporary mortal
C<SV*> if the hash entry contains only a C<char*> key.

=for apidoc Am|SV*|HeSVKEY_set|HE* he|SV* sv
Sets the key to a given C<SV*>, taking care to set the appropriate flags to
indicate the presence of an C<SV*> key, and returns the same
C<SV*>.

=cut
*/

#define PERL_HASH_DEFAULT_HvMAX 7

/* During hsplit(), if HvMAX(hv)+1 (the new bucket count) is >= this value,
 * we preallocate the HvAUX() struct.
 * The assumption being that we are using so much space anyway we might
 * as well allocate the extra bytes and speed up later keys()
 * or each() operations. We don't do this to small hashes as we assume
 * that a) it will be easy/fast to resize them to add the iterator, and b) that
 * many of them will be objects which won't be traversed. Larger hashes however
 * will take longer to extend, and the size of the aux struct is swamped by the
 * overall length of the bucket array.
 * */
#define PERL_HV_ALLOC_AUX_SIZE (1 << 9)

/* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */
#define HEf_SVKEY	-2	/* hent_key is an SV* */

#ifndef PERL_CORE
#  define Nullhv Null(HV*)
#endif
#define HvARRAY(hv)	((hv)->sv_u.svu_hash)
#define HvFILL(hv)	Perl_hv_fill(aTHX_ MUTABLE_HV(hv))
#define HvMAX(hv)	((XPVHV*)  SvANY(hv))->xhv_max
/* This quite intentionally does no flag checking first. That's your
   responsibility.  */
#define HvAUX(hv)	((struct xpvhv_aux*)&(HvARRAY(hv)[HvMAX(hv)+1]))
#define HvRITER(hv)	(*Perl_hv_riter_p(aTHX_ MUTABLE_HV(hv)))
#define HvEITER(hv)	(*Perl_hv_eiter_p(aTHX_ MUTABLE_HV(hv)))
#define HvRITER_set(hv,r)	Perl_hv_riter_set(aTHX_ MUTABLE_HV(hv), r)
#define HvEITER_set(hv,e)	Perl_hv_eiter_set(aTHX_ MUTABLE_HV(hv), e)
#define HvRITER_get(hv)	(SvOOK(hv) ? HvAUX(hv)->xhv_riter : -1)
#define HvEITER_get(hv)	(SvOOK(hv) ? HvAUX(hv)->xhv_eiter : NULL)
#define HvRAND_get(hv)	(SvOOK(hv) ? HvAUX(hv)->xhv_rand : 0)
#define HvLASTRAND_get(hv)	(SvOOK(hv) ? HvAUX(hv)->xhv_last_rand : 0)

#define HvNAME(hv)	HvNAME_get(hv)
#define HvNAMELEN(hv)   HvNAMELEN_get(hv)
#define HvENAME(hv)	HvENAME_get(hv)
#define HvENAMELEN(hv)  HvENAMELEN_get(hv)

/* Checking that hv is a valid package stash is the
   caller's responsibility */
#define HvMROMETA(hv) (HvAUX(hv)->xhv_mro_meta \
                       ? HvAUX(hv)->xhv_mro_meta \
                       : Perl_mro_meta_init(aTHX_ hv))

#define HvNAME_HEK_NN(hv)			  \
 (						  \
  HvAUX(hv)->xhv_name_count			  \
  ? *HvAUX(hv)->xhv_name_u.xhvnameu_names	  \
  : HvAUX(hv)->xhv_name_u.xhvnameu_name		  \
 )
/* This macro may go away without notice.  */
#define HvNAME_HEK(hv) \
	(SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name ? HvNAME_HEK_NN(hv) : NULL)
#define HvNAME_get(hv) \
	((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
			 ? HEK_KEY(HvNAME_HEK_NN(hv)) : NULL)
#define HvNAMELEN_get(hv) \
	((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
				 ? HEK_LEN(HvNAME_HEK_NN(hv)) : 0)
#define HvNAMEUTF8(hv) \
	((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvNAME_HEK_NN(hv)) \
				 ? HEK_UTF8(HvNAME_HEK_NN(hv)) : 0)
#define HvENAME_HEK_NN(hv)                                             \
 (                                                                      \
  HvAUX(hv)->xhv_name_count > 0   ? HvAUX(hv)->xhv_name_u.xhvnameu_names[0] : \
  HvAUX(hv)->xhv_name_count < -1  ? HvAUX(hv)->xhv_name_u.xhvnameu_names[1] : \
  HvAUX(hv)->xhv_name_count == -1 ? NULL                              : \
                                    HvAUX(hv)->xhv_name_u.xhvnameu_name \
 )
#define HvENAME_HEK(hv) \
	(SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name ? HvENAME_HEK_NN(hv) : NULL)
#define HvENAME_get(hv) \
   ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvAUX(hv)->xhv_name_count != -1) \
			 ? HEK_KEY(HvENAME_HEK_NN(hv)) : NULL)
#define HvENAMELEN_get(hv) \
   ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvAUX(hv)->xhv_name_count != -1) \
				 ? HEK_LEN(HvENAME_HEK_NN(hv)) : 0)
#define HvENAMEUTF8(hv) \
   ((SvOOK(hv) && HvAUX(hv)->xhv_name_u.xhvnameu_name && HvAUX(hv)->xhv_name_count != -1) \
				 ? HEK_UTF8(HvENAME_HEK_NN(hv)) : 0)

/* the number of keys (including any placeholders) */
#define XHvTOTALKEYS(xhv)	((xhv)->xhv_keys)

/*
 * HvKEYS gets the number of keys that actually exist(), and is provided
 * for backwards compatibility with old XS code. The core uses HvUSEDKEYS
 * (keys, excluding placeholders) and HvTOTALKEYS (including placeholders)
 */
#define HvKEYS(hv)		HvUSEDKEYS(hv)
#define HvUSEDKEYS(hv)		(HvTOTALKEYS(hv) - HvPLACEHOLDERS_get(hv))
#define HvTOTALKEYS(hv)		XHvTOTALKEYS((XPVHV*)  SvANY(hv))
#define HvPLACEHOLDERS(hv)	(*Perl_hv_placeholders_p(aTHX_ MUTABLE_HV(hv)))
#define HvPLACEHOLDERS_get(hv)	(SvMAGIC(hv) ? Perl_hv_placeholders_get(aTHX_ (const HV *)hv) : 0)
#define HvPLACEHOLDERS_set(hv,p)	Perl_hv_placeholders_set(aTHX_ MUTABLE_HV(hv), p)

#define HvSHAREKEYS(hv)		(SvFLAGS(hv) & SVphv_SHAREKEYS)
#define HvSHAREKEYS_on(hv)	(SvFLAGS(hv) |= SVphv_SHAREKEYS)
#define HvSHAREKEYS_off(hv)	(SvFLAGS(hv) &= ~SVphv_SHAREKEYS)

/* This is an optimisation flag. It won't be set if all hash keys have a 0
 * flag. Currently the only flags relate to utf8.
 * Hence it won't be set if all keys are 8 bit only. It will be set if any key
 * is utf8 (including 8 bit keys that were entered as utf8, and need upgrading
 * when retrieved during iteration. It may still be set when there are no longer
 * any utf8 keys.
 * See HVhek_ENABLEHVKFLAGS for the trigger.
 */
#define HvHASKFLAGS(hv)		(SvFLAGS(hv) & SVphv_HASKFLAGS)
#define HvHASKFLAGS_on(hv)	(SvFLAGS(hv) |= SVphv_HASKFLAGS)
#define HvHASKFLAGS_off(hv)	(SvFLAGS(hv) &= ~SVphv_HASKFLAGS)

#define HvLAZYDEL(hv)		(SvFLAGS(hv) & SVphv_LAZYDEL)
#define HvLAZYDEL_on(hv)	(SvFLAGS(hv) |= SVphv_LAZYDEL)
#define HvLAZYDEL_off(hv)	(SvFLAGS(hv) &= ~SVphv_LAZYDEL)

#ifndef PERL_CORE
#  define Nullhe Null(HE*)
#endif
#define HeNEXT(he)		(he)->hent_next
#define HeKEY_hek(he)		(he)->hent_hek
#define HeKEY(he)		HEK_KEY(HeKEY_hek(he))
#define HeKEY_sv(he)		(*(SV**)HeKEY(he))
#define HeKLEN(he)		HEK_LEN(HeKEY_hek(he))
#define HeKUTF8(he)  HEK_UTF8(HeKEY_hek(he))
#define HeKWASUTF8(he)  HEK_WASUTF8(HeKEY_hek(he))
#define HeKLEN_UTF8(he)  (HeKUTF8(he) ? -HeKLEN(he) : HeKLEN(he))
#define HeKFLAGS(he)  HEK_FLAGS(HeKEY_hek(he))
#define HeVAL(he)		(he)->he_valu.hent_val
#define HeHASH(he)		HEK_HASH(HeKEY_hek(he))
#define HePV(he,lp)		((HeKLEN(he) == HEf_SVKEY) ?		\
				 SvPV(HeKEY_sv(he),lp) :		\
				 ((lp = HeKLEN(he)), HeKEY(he)))
#define HeUTF8(he)		((HeKLEN(he) == HEf_SVKEY) ?		\
				 SvUTF8(HeKEY_sv(he)) :			\
				 (U32)HeKUTF8(he))

#define HeSVKEY(he)		((HeKEY(he) && 				\
				  HeKLEN(he) == HEf_SVKEY) ?		\
				 HeKEY_sv(he) : NULL)

#define HeSVKEY_force(he)	(HeKEY(he) ?				\
				 ((HeKLEN(he) == HEf_SVKEY) ?		\
				  HeKEY_sv(he) :			\
				  newSVpvn_flags(HeKEY(he),		\
                                                 HeKLEN(he),            \
                                                 SVs_TEMP |             \
                                      ( HeKUTF8(he) ? SVf_UTF8 : 0 ))) : \
				 &PL_sv_undef)
#define HeSVKEY_set(he,sv)	((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv))

#ifndef PERL_CORE
#  define Nullhek Null(HEK*)
#endif
#define HEK_BASESIZE		STRUCT_OFFSET(HEK, hek_key[0])
#define HEK_HASH(hek)		(hek)->hek_hash
#define HEK_LEN(hek)		(hek)->hek_len
#define HEK_KEY(hek)		(hek)->hek_key
#define HEK_FLAGS(hek)	(*((unsigned char *)(HEK_KEY(hek))+HEK_LEN(hek)+1))

#define HVhek_UTF8	0x01 /* Key is utf8 encoded. */
#define HVhek_WASUTF8	0x02 /* Key is bytes here, but was supplied as utf8. */
#define HVhek_UNSHARED	0x08 /* This key isn't a shared hash key. */
/* the following flags are options for functions, they are not stored in heks */
#define HVhek_FREEKEY	0x100 /* Internal flag to say key is Newx()ed.  */
#define HVhek_PLACEHOLD	0x200 /* Internal flag to create placeholder.
                               * (may change, but Storable is a core module) */
#define HVhek_KEYCANONICAL 0x400 /* Internal flag - key is in canonical form.
				    If the string is UTF-8, it cannot be
				    converted to bytes. */
#define HVhek_MASK	0xFF

#define HVhek_ENABLEHVKFLAGS        (HVhek_MASK & ~(HVhek_UNSHARED))

#define HEK_UTF8(hek)		(HEK_FLAGS(hek) & HVhek_UTF8)
#define HEK_UTF8_on(hek)	(HEK_FLAGS(hek) |= HVhek_UTF8)
#define HEK_UTF8_off(hek)	(HEK_FLAGS(hek) &= ~HVhek_UTF8)
#define HEK_WASUTF8(hek)	(HEK_FLAGS(hek) & HVhek_WASUTF8)
#define HEK_WASUTF8_on(hek)	(HEK_FLAGS(hek) |= HVhek_WASUTF8)
#define HEK_WASUTF8_off(hek)	(HEK_FLAGS(hek) &= ~HVhek_WASUTF8)

/* calculate HV array allocation */
#ifndef PERL_USE_LARGE_HV_ALLOC
/* Default to allocating the correct size - default to assuming that malloc()
   is not broken and is efficient at allocating blocks sized at powers-of-two.
*/   
#  define PERL_HV_ARRAY_ALLOC_BYTES(size) ((size) * sizeof(HE*))
#else
#  define MALLOC_OVERHEAD 16
#  define PERL_HV_ARRAY_ALLOC_BYTES(size) \
			(((size) < 64)					\
			 ? (size) * sizeof(HE*)				\
			 : (size) * sizeof(HE*) * 2 - MALLOC_OVERHEAD)
#endif

/* Flags for hv_iternext_flags.  */
#define HV_ITERNEXT_WANTPLACEHOLDERS	0x01	/* Don't skip placeholders.  */

#define hv_iternext(hv)	hv_iternext_flags(hv, 0)
#define hv_magic(hv, gv, how) sv_magic(MUTABLE_SV(hv), MUTABLE_SV(gv), how, NULL, 0)
#define hv_undef(hv) Perl_hv_undef_flags(aTHX_ hv, 0)

#define Perl_sharepvn(pv, len, hash) HEK_KEY(share_hek(pv, len, hash))
#define sharepvn(pv, len, hash)	     Perl_sharepvn(pv, len, hash)

#define share_hek_hek(hek)						\
    (++(((struct shared_he *)(((char *)hek)				\
			      - STRUCT_OFFSET(struct shared_he,		\
					      shared_he_hek)))		\
	->shared_he_he.he_valu.hent_refcount),				\
     hek)

#define hv_store_ent(hv, keysv, val, hash)				\
    ((HE *) hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISSTORE,	\
		      (val), (hash)))

#define hv_exists_ent(hv, keysv, hash)					\
    (hv_common((hv), (keysv), NULL, 0, 0, HV_FETCH_ISEXISTS, 0, (hash))	\
     ? TRUE : FALSE)
#define hv_fetch_ent(hv, keysv, lval, hash)				\
    ((HE *) hv_common((hv), (keysv), NULL, 0, 0,			\
		      ((lval) ? HV_FETCH_LVALUE : 0), NULL, (hash)))
#define hv_delete_ent(hv, key, flags, hash)				\
    (MUTABLE_SV(hv_common((hv), (key), NULL, 0, 0, (flags) | HV_DELETE,	\
			  NULL, (hash))))

#define hv_store_flags(hv, key, klen, val, hash, flags)			\
    ((SV**) hv_common((hv), NULL, (key), (klen), (flags),		\
		      (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), (val),	\
		      (hash)))

#define hv_store(hv, key, klen, val, hash)				\
    ((SV**) hv_common_key_len((hv), (key), (klen),			\
			      (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV),	\
			      (val), (hash)))

#define hv_exists(hv, key, klen)					\
    (hv_common_key_len((hv), (key), (klen), HV_FETCH_ISEXISTS, NULL, 0) \
     ? TRUE : FALSE)

#define hv_fetch(hv, key, klen, lval)					\
    ((SV**) hv_common_key_len((hv), (key), (klen), (lval)		\
			      ? (HV_FETCH_JUST_SV | HV_FETCH_LVALUE)	\
			      : HV_FETCH_JUST_SV, NULL, 0))

#define hv_delete(hv, key, klen, flags)					\
    (MUTABLE_SV(hv_common_key_len((hv), (key), (klen),			\
				  (flags) | HV_DELETE, NULL, 0)))

#ifdef PERL_CORE
# define hv_storehek(hv, hek, val) \
    hv_common((hv), NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_UTF8(hek),	\
	      HV_FETCH_ISSTORE|HV_FETCH_JUST_SV, (val), HEK_HASH(hek))
# define hv_fetchhek(hv, hek, lval) \
    ((SV **)								\
     hv_common((hv), NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_UTF8(hek),	\
	       (lval)							\
		? (HV_FETCH_JUST_SV | HV_FETCH_LVALUE)			\
		: HV_FETCH_JUST_SV,					\
	       NULL, HEK_HASH(hek)))
# define hv_deletehek(hv, hek, flags) \
    hv_common((hv), NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_UTF8(hek), \
	      (flags)|HV_DELETE, NULL, HEK_HASH(hek))
#endif

/* This refcounted he structure is used for storing the hints used for lexical
   pragmas. Without threads, it's basically struct he + refcount.
   With threads, life gets more complex as the structure needs to be shared
   between threads (because it hangs from OPs, which are shared), hence the
   alternate definition and mutex.  */

struct refcounted_he;

/* flags for the refcounted_he API */
#define REFCOUNTED_HE_KEY_UTF8		0x00000001
#ifdef PERL_CORE
# define REFCOUNTED_HE_EXISTS		0x00000002
#endif

#ifdef PERL_CORE

/* Gosh. This really isn't a good name any longer.  */
struct refcounted_he {
    struct refcounted_he *refcounted_he_next;	/* next entry in chain */
#ifdef USE_ITHREADS
    U32                   refcounted_he_hash;
    U32                   refcounted_he_keylen;
#else
    HEK                  *refcounted_he_hek;	/* hint key */
#endif
    union {
	IV                refcounted_he_u_iv;
	UV                refcounted_he_u_uv;
	STRLEN            refcounted_he_u_len;
	void		 *refcounted_he_u_ptr;	/* Might be useful in future */
    } refcounted_he_val;
    U32	                  refcounted_he_refcnt;	/* reference count */
    /* First byte is flags. Then NUL-terminated value. Then for ithreads,
       non-NUL terminated key.  */
    char                  refcounted_he_data[1];
};

/*
=for apidoc m|SV *|refcounted_he_fetch_pvs|const struct refcounted_he *chain|const char *key|U32 flags

Like L</refcounted_he_fetch_pvn>, but takes a C<NUL>-terminated literal string
instead of a string/length pair, and no precomputed hash.

=cut
*/

#define refcounted_he_fetch_pvs(chain, key, flags) \
    Perl_refcounted_he_fetch_pvn(aTHX_ chain, STR_WITH_LEN(key), 0, flags)

/*
=for apidoc m|struct refcounted_he *|refcounted_he_new_pvs|struct refcounted_he *parent|const char *key|SV *value|U32 flags

Like L</refcounted_he_new_pvn>, but takes a C<NUL>-terminated literal string
instead of a string/length pair, and no precomputed hash.

=cut
*/

#define refcounted_he_new_pvs(parent, key, value, flags) \
    Perl_refcounted_he_new_pvn(aTHX_ parent, STR_WITH_LEN(key), 0, value, flags)

/* Flag bits are HVhek_UTF8, HVhek_WASUTF8, then */
#define HVrhek_undef	0x00 /* Value is undef. */
#define HVrhek_delete	0x10 /* Value is placeholder - signifies delete. */
#define HVrhek_IV	0x20 /* Value is IV. */
#define HVrhek_UV	0x30 /* Value is UV. */
#define HVrhek_PV	0x40 /* Value is a (byte) string. */
#define HVrhek_PV_UTF8	0x50 /* Value is a (utf8) string. */
/* Two spare. As these have to live in the optree, you can't store anything
   interpreter specific, such as SVs. :-( */
#define HVrhek_typemask 0x70

#ifdef USE_ITHREADS
/* A big expression to find the key offset */
#define REF_HE_KEY(chain)						\
	((((chain->refcounted_he_data[0] & 0x60) == 0x40)		\
	    ? chain->refcounted_he_val.refcounted_he_u_len + 1 : 0)	\
	 + 1 + chain->refcounted_he_data)
#endif

#  ifdef USE_ITHREADS
#    define HINTS_REFCNT_LOCK		MUTEX_LOCK(&PL_hints_mutex)
#    define HINTS_REFCNT_UNLOCK		MUTEX_UNLOCK(&PL_hints_mutex)
#  else
#    define HINTS_REFCNT_LOCK		NOOP
#    define HINTS_REFCNT_UNLOCK		NOOP
#  endif
#endif

#ifdef USE_ITHREADS
#  define HINTS_REFCNT_INIT		MUTEX_INIT(&PL_hints_mutex)
#  define HINTS_REFCNT_TERM		MUTEX_DESTROY(&PL_hints_mutex)
#else
#  define HINTS_REFCNT_INIT		NOOP
#  define HINTS_REFCNT_TERM		NOOP
#endif

/* Hash actions
 * Passed in PERL_MAGIC_uvar calls
 */
#define HV_DISABLE_UVAR_XKEY	0x01
/* We need to ensure that these don't clash with G_DISCARD, which is 2, as it
   is documented as being passed to hv_delete().  */
#define HV_FETCH_ISSTORE	0x04
#define HV_FETCH_ISEXISTS	0x08
#define HV_FETCH_LVALUE		0x10
#define HV_FETCH_JUST_SV	0x20
#define HV_DELETE		0x40
#define HV_FETCH_EMPTY_HE	0x80 /* Leave HeVAL null. */

/* Must not conflict with HVhek_UTF8 */
#define HV_NAME_SETALL		0x02

/*
=for apidoc newHV

Creates a new HV.  The reference count is set to 1.

=cut
*/

#define newHV()	MUTABLE_HV(newSV_type(SVt_PVHV))

#include "hv_func.h"

/*
 * ex: set ts=8 sts=4 sw=4 et:
 */