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
|
/* hv.h
*
* Copyright (c) 1991-2002, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/* typedefs to eliminate some typing */
typedef struct he HE;
typedef struct hek HEK;
/* entry in hash value chain */
struct he {
HE *hent_next; /* next entry in chain */
HEK *hent_hek; /* hash key */
SV *hent_val; /* scalar value that was hashed */
};
/* 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
UTF8 */
};
/* hash structure: */
/* This structure must match the beginning of struct xpvmg in sv.h. */
struct xpvhv {
char * xhv_array; /* pointer to malloced string */
STRLEN xhv_fill; /* how full xhv_array currently is */
STRLEN xhv_max; /* subscript of last element of xhv_array */
IV xhv_keys; /* how many elements in the array */
NV xnv_nv; /* numeric value, if any */
#define xhv_placeholders xnv_nv
MAGIC* xmg_magic; /* magic for scalar array */
HV* xmg_stash; /* class package */
I32 xhv_riter; /* current root of iterator */
HE *xhv_eiter; /* current entry of iterator */
PMOP *xhv_pmroot; /* list of pm's for this package */
char *xhv_name; /* name, if a symbol table */
};
/* hash a key */
/* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins */
/* from requirements by Colin Plumb. */
/* (http://burtleburtle.net/bob/hash/doobs.html) */
#define PERL_HASH(hash,str,len) \
STMT_START { \
register const unsigned char *s_PeRlHaSh = str; \
register I32 i_PeRlHaSh = len; \
register U32 hash_PeRlHaSh = 0; \
while (i_PeRlHaSh--) { \
hash_PeRlHaSh += *s_PeRlHaSh++; \
hash_PeRlHaSh += (hash_PeRlHaSh << 10); \
hash_PeRlHaSh ^= (hash_PeRlHaSh >> 6); \
} \
hash_PeRlHaSh += (hash_PeRlHaSh << 3); \
hash_PeRlHaSh ^= (hash_PeRlHaSh >> 11); \
(hash) = (hash_PeRlHaSh + (hash_PeRlHaSh << 15)); \
} STMT_END
/*
=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.
=head1 Hash Manipulation Functions
=for apidoc Am|char*|HvNAME|HV* stash
Returns the package name of a stash. See C<SvSTASH>, C<CvSTASH>.
=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.
=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.
=for apidoc Am|SV*|HeSVKEY|HE* he
Returns the key as an C<SV*>, or C<Nullsv> 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
*/
/* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */
#define HEf_SVKEY -2 /* hent_key is an SV* */
#define Nullhv Null(HV*)
#define HvARRAY(hv) (*(HE***)&((XPVHV*) SvANY(hv))->xhv_array)
#define HvFILL(hv) ((XPVHV*) SvANY(hv))->xhv_fill
#define HvMAX(hv) ((XPVHV*) SvANY(hv))->xhv_max
#define HvRITER(hv) ((XPVHV*) SvANY(hv))->xhv_riter
#define HvEITER(hv) ((XPVHV*) SvANY(hv))->xhv_eiter
#define HvPMROOT(hv) ((XPVHV*) SvANY(hv))->xhv_pmroot
#define HvNAME(hv) ((XPVHV*) SvANY(hv))->xhv_name
/* the number of keys (including any placeholers) */
#define XHvTOTALKEYS(xhv) ((xhv)->xhv_keys)
/* The number of placeholders in the enumerated-keys hash */
#define XHvPLACEHOLDERS(xhv) ((xhv)->xhv_placeholders)
/* the number of keys that exist() (i.e. excluding placeholders) */
#define XHvUSEDKEYS(xhv) (XHvTOTALKEYS(xhv) - (IV)XHvPLACEHOLDERS(xhv))
/*
* 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 placeholdes) and HvTOTALKEYS (including placeholders)
*/
#define HvKEYS(hv) XHvUSEDKEYS((XPVHV*) SvANY(hv))
#define HvUSEDKEYS(hv) XHvUSEDKEYS((XPVHV*) SvANY(hv))
#define HvTOTALKEYS(hv) XHvTOTALKEYS((XPVHV*) SvANY(hv))
#define HvPLACEHOLDERS(hv) XHvPLACEHOLDERS((XPVHV*) SvANY(hv))
#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.
*/
#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)
/* Maybe amagical: */
/* #define HV_AMAGICmb(hv) (SvFLAGS(hv) & (SVpgv_badAM | SVpgv_AM)) */
#define HV_AMAGIC(hv) (SvFLAGS(hv) & SVpgv_AM)
#define HV_AMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_AM)
#define HV_AMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_AM)
/*
#define HV_AMAGICbad(hv) (SvFLAGS(hv) & SVpgv_badAM)
#define HV_badAMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_badAM)
#define HV_badAMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_badAM)
*/
#define Nullhe Null(HE*)
#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)->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)) >= 0) ? \
HeKEY(he) : Nullch))
#define HeSVKEY(he) ((HeKEY(he) && \
HeKLEN(he) == HEf_SVKEY) ? \
HeKEY_sv(he) : Nullsv)
#define HeSVKEY_force(he) (HeKEY(he) ? \
((HeKLEN(he) == HEf_SVKEY) ? \
HeKEY_sv(he) : \
sv_2mortal(newSVpvn(HeKEY(he), \
HeKLEN(he)))) : \
&PL_sv_undef)
#define HeSVKEY_set(he,sv) ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv))
#define Nullhek Null(HEK*)
#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_FREEKEY 0x100 /* Internal flag to say key is malloc()ed. */
#define HVhek_PLACEHOLD 0x200 /* Internal flag to create placeholder.
* (may change, but Storable is a core module) */
#define HVhek_MASK 0xFF
#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 */
#if defined(STRANGE_MALLOC) || defined(MYMALLOC)
# 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. */
/* available as a function in hv.c */
#define Perl_sharepvn(sv, len, hash) HEK_KEY(share_hek(sv, len, hash))
#define sharepvn(sv, len, hash) Perl_sharepvn(sv, len, hash)
|
