Commit | Line | Data |
a0d0e21e |
1 | /* hv.h |
79072805 |
2 | * |
4bb101f2 |
3 | * Copyright (C) 1991, 1992, 1993, 1996, 1997, 1998, 1999, |
1d325971 |
4 | * 2000, 2001, 2002, 2005, by Larry Wall and others |
79072805 |
5 | * |
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. |
8 | * |
79072805 |
9 | */ |
10 | |
5cbe4eec |
11 | /* typedefs to eliminate some typing */ |
79072805 |
12 | typedef struct he HE; |
ff68c719 |
13 | typedef struct hek HEK; |
79072805 |
14 | |
5cbe4eec |
15 | /* entry in hash value chain */ |
79072805 |
16 | struct he { |
5cbe4eec |
17 | HE *hent_next; /* next entry in chain */ |
18 | HEK *hent_hek; /* hash key */ |
19 | SV *hent_val; /* scalar value that was hashed */ |
bbce6d69 |
20 | }; |
21 | |
5cbe4eec |
22 | /* hash key -- defined separately for use as shared pointer */ |
ff68c719 |
23 | struct hek { |
5cbe4eec |
24 | U32 hek_hash; /* hash of key */ |
25 | I32 hek_len; /* length of hash key */ |
26 | char hek_key[1]; /* variable-length hash key */ |
e05949c7 |
27 | /* the hash-key is \0-terminated */ |
1e54db1a |
28 | /* after the \0 there is a byte for flags, such as whether the key |
29 | is UTF-8 */ |
79072805 |
30 | }; |
31 | |
bfcb3514 |
32 | |
33 | /* Subject to change. |
34 | Don't access this directly. |
35 | */ |
36 | struct xpvhv_aux { |
7423f6db |
37 | HEK *xhv_name; /* name, if a symbol table */ |
bfcb3514 |
38 | HE *xhv_eiter; /* current entry of iterator */ |
39 | I32 xhv_riter; /* current root of iterator */ |
40 | }; |
41 | |
5cbe4eec |
42 | /* hash structure: */ |
6ee623d5 |
43 | /* This structure must match the beginning of struct xpvmg in sv.h. */ |
79072805 |
44 | struct xpvhv { |
102d3b8a |
45 | IV for_rent; |
463ee0b2 |
46 | STRLEN xhv_fill; /* how full xhv_array currently is */ |
47 | STRLEN xhv_max; /* subscript of last element of xhv_array */ |
e4305a63 |
48 | union { |
e4305a63 |
49 | struct { |
50 | void *xnv_p1; |
51 | union { |
52 | void *xnv_p2; |
53 | IV xnv_i2; /* how many elements in the array */ |
54 | } xnv_u2; |
55 | } xnv_s; |
199f3245 |
56 | NV xnvu_nv; /* numeric value, if any */ |
e4305a63 |
57 | } xnv_u; |
79072805 |
58 | MAGIC* xmg_magic; /* magic for scalar array */ |
59 | HV* xmg_stash; /* class package */ |
8d2f4536 |
60 | /* list of pm's for this package is now stored in symtab magic. */ |
79072805 |
61 | }; |
62 | |
e4305a63 |
63 | #define xhv_aux xnv_u.xnv_s.xnv_p1 |
64 | #define xhv_keys xnv_u.xnv_s.xnv_u2.xnv_i2 |
65 | |
209b62a3 |
66 | #if !defined(PERL_EXPERIMENTAL_LAYOUT) |
59813432 |
67 | typedef struct xpvhv xpvhv_allocated; |
9f1501b2 |
68 | #else |
69 | typedef struct { |
70 | STRLEN xhv_fill; /* how full xhv_array currently is */ |
71 | STRLEN xhv_max; /* subscript of last element of xhv_array */ |
72 | union { |
73 | NV xnvu_nv; /* numeric value, if any */ |
74 | struct { |
75 | void *xnv_p1; |
76 | union { |
77 | void *xnv_p2; |
78 | IV xnv_i2; /* how many elements in the array */ |
79 | } xnv_u2; |
80 | } xnv_s; |
81 | } xnv_u; |
82 | MAGIC* xmg_magic; /* magic for scalar array */ |
83 | HV* xmg_stash; /* class package */ |
84 | } xpvhv_allocated; |
85 | #endif |
e4305a63 |
86 | |
5cbe4eec |
87 | /* hash a key */ |
5afd6d42 |
88 | /* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins |
89 | * from requirements by Colin Plumb. |
90 | * (http://burtleburtle.net/bob/hash/doobs.html) */ |
91 | /* The use of a temporary pointer and the casting games |
92 | * is needed to serve the dual purposes of |
93 | * (a) the hashed data being interpreted as "unsigned char" (new since 5.8, |
94 | * a "char" can be either signed or signed, depending on the compiler) |
95 | * (b) catering for old code that uses a "char" |
830b38bd |
96 | * |
504f80c1 |
97 | * The "hash seed" feature was added in Perl 5.8.1 to perturb the results |
98 | * to avoid "algorithmic complexity attacks". |
830b38bd |
99 | * |
100 | * If USE_HASH_SEED is defined, hash randomisation is done by default |
101 | * If USE_HASH_SEED_EXPLICIT is defined, hash randomisation is done |
102 | * only if the environment variable PERL_HASH_SEED is set. |
103 | * For maximal control, one can define PERL_HASH_SEED. |
90ce55a1 |
104 | * (see also perl.c:perl_parse()). |
5afd6d42 |
105 | */ |
830b38bd |
106 | #ifndef PERL_HASH_SEED |
107 | # if defined(USE_HASH_SEED) || defined(USE_HASH_SEED_EXPLICIT) |
108 | # define PERL_HASH_SEED PL_hash_seed |
109 | # else |
110 | # define PERL_HASH_SEED 0 |
111 | # endif |
504f80c1 |
112 | #endif |
bf6bd887 |
113 | #define PERL_HASH(hash,str,len) \ |
114 | STMT_START { \ |
5afd6d42 |
115 | register const char *s_PeRlHaSh_tmp = str; \ |
116 | register const unsigned char *s_PeRlHaSh = (const unsigned char *)s_PeRlHaSh_tmp; \ |
bf6bd887 |
117 | register I32 i_PeRlHaSh = len; \ |
504f80c1 |
118 | register U32 hash_PeRlHaSh = PERL_HASH_SEED; \ |
a6fe520e |
119 | while (i_PeRlHaSh--) { \ |
120 | hash_PeRlHaSh += *s_PeRlHaSh++; \ |
121 | hash_PeRlHaSh += (hash_PeRlHaSh << 10); \ |
122 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 6); \ |
123 | } \ |
124 | hash_PeRlHaSh += (hash_PeRlHaSh << 3); \ |
125 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 11); \ |
4fee5c71 |
126 | (hash) = (hash_PeRlHaSh + (hash_PeRlHaSh << 15)); \ |
bf6bd887 |
127 | } STMT_END |
128 | |
3d78eb94 |
129 | /* Only hv.c and mod_perl should be doing this. */ |
130 | #ifdef PERL_HASH_INTERNAL_ACCESS |
4b5190b5 |
131 | #define PERL_HASH_INTERNAL(hash,str,len) \ |
132 | STMT_START { \ |
133 | register const char *s_PeRlHaSh_tmp = str; \ |
134 | register const unsigned char *s_PeRlHaSh = (const unsigned char *)s_PeRlHaSh_tmp; \ |
135 | register I32 i_PeRlHaSh = len; \ |
008fb0c0 |
136 | register U32 hash_PeRlHaSh = PL_rehash_seed; \ |
4b5190b5 |
137 | while (i_PeRlHaSh--) { \ |
138 | hash_PeRlHaSh += *s_PeRlHaSh++; \ |
139 | hash_PeRlHaSh += (hash_PeRlHaSh << 10); \ |
140 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 6); \ |
141 | } \ |
142 | hash_PeRlHaSh += (hash_PeRlHaSh << 3); \ |
143 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 11); \ |
144 | (hash) = (hash_PeRlHaSh + (hash_PeRlHaSh << 15)); \ |
145 | } STMT_END |
146 | #endif |
147 | |
954c1994 |
148 | /* |
ccfc67b7 |
149 | =head1 Hash Manipulation Functions |
150 | |
954c1994 |
151 | =for apidoc AmU||HEf_SVKEY |
152 | This flag, used in the length slot of hash entries and magic structures, |
d1be9408 |
153 | specifies the structure contains an C<SV*> pointer where a C<char*> pointer |
954c1994 |
154 | is to be expected. (For information only--not to be used). |
155 | |
ccfc67b7 |
156 | =head1 Handy Values |
157 | |
954c1994 |
158 | =for apidoc AmU||Nullhv |
159 | Null HV pointer. |
160 | |
ccfc67b7 |
161 | =head1 Hash Manipulation Functions |
162 | |
954c1994 |
163 | =for apidoc Am|char*|HvNAME|HV* stash |
164 | Returns the package name of a stash. See C<SvSTASH>, C<CvSTASH>. |
165 | |
166 | =for apidoc Am|void*|HeKEY|HE* he |
167 | Returns the actual pointer stored in the key slot of the hash entry. The |
168 | pointer may be either C<char*> or C<SV*>, depending on the value of |
169 | C<HeKLEN()>. Can be assigned to. The C<HePV()> or C<HeSVKEY()> macros are |
170 | usually preferable for finding the value of a key. |
171 | |
172 | =for apidoc Am|STRLEN|HeKLEN|HE* he |
173 | If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry |
174 | holds an C<SV*> key. Otherwise, holds the actual length of the key. Can |
175 | be assigned to. The C<HePV()> macro is usually preferable for finding key |
176 | lengths. |
177 | |
178 | =for apidoc Am|SV*|HeVAL|HE* he |
179 | Returns the value slot (type C<SV*>) stored in the hash entry. |
180 | |
181 | =for apidoc Am|U32|HeHASH|HE* he |
182 | Returns the computed hash stored in the hash entry. |
183 | |
184 | =for apidoc Am|char*|HePV|HE* he|STRLEN len |
185 | Returns the key slot of the hash entry as a C<char*> value, doing any |
186 | necessary dereferencing of possibly C<SV*> keys. The length of the string |
187 | is placed in C<len> (this is a macro, so do I<not> use C<&len>). If you do |
188 | not care about what the length of the key is, you may use the global |
189 | variable C<PL_na>, though this is rather less efficient than using a local |
190 | variable. Remember though, that hash keys in perl are free to contain |
191 | embedded nulls, so using C<strlen()> or similar is not a good way to find |
192 | the length of hash keys. This is very similar to the C<SvPV()> macro |
193 | described elsewhere in this document. |
194 | |
195 | =for apidoc Am|SV*|HeSVKEY|HE* he |
196 | Returns the key as an C<SV*>, or C<Nullsv> if the hash entry does not |
197 | contain an C<SV*> key. |
198 | |
199 | =for apidoc Am|SV*|HeSVKEY_force|HE* he |
200 | Returns the key as an C<SV*>. Will create and return a temporary mortal |
201 | C<SV*> if the hash entry contains only a C<char*> key. |
202 | |
203 | =for apidoc Am|SV*|HeSVKEY_set|HE* he|SV* sv |
204 | Sets the key to a given C<SV*>, taking care to set the appropriate flags to |
205 | indicate the presence of an C<SV*> key, and returns the same |
206 | C<SV*>. |
207 | |
208 | =cut |
209 | */ |
bf6bd887 |
210 | |
bf5b86ae |
211 | /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */ |
d1be9408 |
212 | #define HEf_SVKEY -2 /* hent_key is an SV* */ |
bf6bd887 |
213 | |
214 | |
79072805 |
215 | #define Nullhv Null(HV*) |
339049b0 |
216 | #define HvARRAY(hv) (*(HE***)&((hv)->sv_u.svu_array)) |
79072805 |
217 | #define HvFILL(hv) ((XPVHV*) SvANY(hv))->xhv_fill |
463ee0b2 |
218 | #define HvMAX(hv) ((XPVHV*) SvANY(hv))->xhv_max |
bfcb3514 |
219 | #define HvRITER(hv) (*Perl_hv_riter_p(aTHX_ (HV*)(hv))) |
220 | #define HvEITER(hv) (*Perl_hv_eiter_p(aTHX_ (HV*)(hv))) |
221 | #define HvRITER_set(hv,r) Perl_hv_riter_set(aTHX_ (HV*)(hv), r) |
222 | #define HvEITER_set(hv,e) Perl_hv_eiter_set(aTHX_ (HV*)(hv), e) |
223 | #define HvRITER_get(hv) (((XPVHV *)SvANY(hv))->xhv_aux ? \ |
224 | ((struct xpvhv_aux*)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_riter : -1) |
225 | #define HvEITER_get(hv) (((XPVHV *)SvANY(hv))->xhv_aux ? \ |
226 | ((struct xpvhv_aux *)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_eiter : 0) |
7423f6db |
227 | #define HvNAME(hv) HvNAME_get(hv) |
bfcb3514 |
228 | /* FIXME - all of these should use a UTF8 aware API, which should also involve |
229 | getting the length. */ |
9b9d0b15 |
230 | /* This macro may go away without notice. */ |
231 | #define HvNAME_HEK(hv) (((XPVHV *)SvANY(hv))->xhv_aux && (((struct xpvhv_aux *)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_name) ? ((struct xpvhv_aux *)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_name: 0) |
bfcb3514 |
232 | #define HvNAME_get(hv) (((XPVHV *)SvANY(hv))->xhv_aux ? \ |
7423f6db |
233 | (((struct xpvhv_aux *)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_name) ? HEK_KEY(((struct xpvhv_aux *)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_name) : 0 : 0) |
234 | #define HvNAMELEN_get(hv) (((XPVHV *)SvANY(hv))->xhv_aux ? \ |
235 | (((struct xpvhv_aux *)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_name) ? HEK_LEN(((struct xpvhv_aux *)((XPVHV *)SvANY(hv))->xhv_aux)->xhv_name) : 0 : 0) |
a0d0e21e |
236 | |
8aacddc1 |
237 | /* the number of keys (including any placeholers) */ |
238 | #define XHvTOTALKEYS(xhv) ((xhv)->xhv_keys) |
239 | |
8aacddc1 |
240 | /* |
241 | * HvKEYS gets the number of keys that actually exist(), and is provided |
242 | * for backwards compatibility with old XS code. The core uses HvUSEDKEYS |
243 | * (keys, excluding placeholdes) and HvTOTALKEYS (including placeholders) |
244 | */ |
ca732855 |
245 | #define HvKEYS(hv) HvUSEDKEYS(hv) |
246 | #define HvUSEDKEYS(hv) (HvTOTALKEYS(hv) - HvPLACEHOLDERS_get(hv)) |
8aacddc1 |
247 | #define HvTOTALKEYS(hv) XHvTOTALKEYS((XPVHV*) SvANY(hv)) |
ca732855 |
248 | #define HvPLACEHOLDERS(hv) (*Perl_hv_placeholders_p(aTHX_ (HV*)hv)) |
249 | #define HvPLACEHOLDERS_get(hv) (SvMAGIC(hv) ? Perl_hv_placeholders_get(aTHX_ (HV*)hv) : 0) |
250 | #define HvPLACEHOLDERS_set(hv,p) Perl_hv_placeholders_set(aTHX_ (HV*)hv, p) |
8aacddc1 |
251 | |
bf6bd887 |
252 | #define HvSHAREKEYS(hv) (SvFLAGS(hv) & SVphv_SHAREKEYS) |
253 | #define HvSHAREKEYS_on(hv) (SvFLAGS(hv) |= SVphv_SHAREKEYS) |
254 | #define HvSHAREKEYS_off(hv) (SvFLAGS(hv) &= ~SVphv_SHAREKEYS) |
255 | |
19692e8d |
256 | /* This is an optimisation flag. It won't be set if all hash keys have a 0 |
257 | * flag. Currently the only flags relate to utf8. |
258 | * Hence it won't be set if all keys are 8 bit only. It will be set if any key |
259 | * is utf8 (including 8 bit keys that were entered as utf8, and need upgrading |
260 | * when retrieved during iteration. It may still be set when there are no longer |
261 | * any utf8 keys. |
fdcd69b6 |
262 | * See HVhek_ENABLEHVKFLAGS for the trigger. |
19692e8d |
263 | */ |
264 | #define HvHASKFLAGS(hv) (SvFLAGS(hv) & SVphv_HASKFLAGS) |
265 | #define HvHASKFLAGS_on(hv) (SvFLAGS(hv) |= SVphv_HASKFLAGS) |
266 | #define HvHASKFLAGS_off(hv) (SvFLAGS(hv) &= ~SVphv_HASKFLAGS) |
574c8022 |
267 | |
bf5b86ae |
268 | #define HvLAZYDEL(hv) (SvFLAGS(hv) & SVphv_LAZYDEL) |
269 | #define HvLAZYDEL_on(hv) (SvFLAGS(hv) |= SVphv_LAZYDEL) |
270 | #define HvLAZYDEL_off(hv) (SvFLAGS(hv) &= ~SVphv_LAZYDEL) |
271 | |
4b5190b5 |
272 | #define HvREHASH(hv) (SvFLAGS(hv) & SVphv_REHASH) |
273 | #define HvREHASH_on(hv) (SvFLAGS(hv) |= SVphv_REHASH) |
274 | #define HvREHASH_off(hv) (SvFLAGS(hv) &= ~SVphv_REHASH) |
275 | |
a0d0e21e |
276 | /* Maybe amagical: */ |
277 | /* #define HV_AMAGICmb(hv) (SvFLAGS(hv) & (SVpgv_badAM | SVpgv_AM)) */ |
278 | |
279 | #define HV_AMAGIC(hv) (SvFLAGS(hv) & SVpgv_AM) |
280 | #define HV_AMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_AM) |
281 | #define HV_AMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_AM) |
282 | |
283 | /* |
284 | #define HV_AMAGICbad(hv) (SvFLAGS(hv) & SVpgv_badAM) |
285 | #define HV_badAMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_badAM) |
286 | #define HV_badAMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_badAM) |
287 | */ |
bf6bd887 |
288 | |
289 | #define Nullhe Null(HE*) |
290 | #define HeNEXT(he) (he)->hent_next |
ff68c719 |
291 | #define HeKEY_hek(he) (he)->hent_hek |
292 | #define HeKEY(he) HEK_KEY(HeKEY_hek(he)) |
bbce6d69 |
293 | #define HeKEY_sv(he) (*(SV**)HeKEY(he)) |
ff68c719 |
294 | #define HeKLEN(he) HEK_LEN(HeKEY_hek(he)) |
da58a35d |
295 | #define HeKUTF8(he) HEK_UTF8(HeKEY_hek(he)) |
19692e8d |
296 | #define HeKWASUTF8(he) HEK_WASUTF8(HeKEY_hek(he)) |
4b5190b5 |
297 | #define HeKREHASH(he) HEK_REHASH(HeKEY_hek(he)) |
da58a35d |
298 | #define HeKLEN_UTF8(he) (HeKUTF8(he) ? -HeKLEN(he) : HeKLEN(he)) |
19692e8d |
299 | #define HeKFLAGS(he) HEK_FLAGS(HeKEY_hek(he)) |
bf6bd887 |
300 | #define HeVAL(he) (he)->hent_val |
ff68c719 |
301 | #define HeHASH(he) HEK_HASH(HeKEY_hek(he)) |
1e422769 |
302 | #define HePV(he,lp) ((HeKLEN(he) == HEf_SVKEY) ? \ |
303 | SvPV(HeKEY_sv(he),lp) : \ |
304 | (((lp = HeKLEN(he)) >= 0) ? \ |
305 | HeKEY(he) : Nullch)) |
306 | |
bbce6d69 |
307 | #define HeSVKEY(he) ((HeKEY(he) && \ |
308 | HeKLEN(he) == HEf_SVKEY) ? \ |
309 | HeKEY_sv(he) : Nullsv) |
310 | |
311 | #define HeSVKEY_force(he) (HeKEY(he) ? \ |
312 | ((HeKLEN(he) == HEf_SVKEY) ? \ |
313 | HeKEY_sv(he) : \ |
79cb57f6 |
314 | sv_2mortal(newSVpvn(HeKEY(he), \ |
bbce6d69 |
315 | HeKLEN(he)))) : \ |
3280af22 |
316 | &PL_sv_undef) |
1e422769 |
317 | #define HeSVKEY_set(he,sv) ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv)) |
bbce6d69 |
318 | |
ff68c719 |
319 | #define Nullhek Null(HEK*) |
71be2cbc |
320 | #define HEK_BASESIZE STRUCT_OFFSET(HEK, hek_key[0]) |
ff68c719 |
321 | #define HEK_HASH(hek) (hek)->hek_hash |
322 | #define HEK_LEN(hek) (hek)->hek_len |
323 | #define HEK_KEY(hek) (hek)->hek_key |
19692e8d |
324 | #define HEK_FLAGS(hek) (*((unsigned char *)(HEK_KEY(hek))+HEK_LEN(hek)+1)) |
325 | |
326 | #define HVhek_UTF8 0x01 /* Key is utf8 encoded. */ |
327 | #define HVhek_WASUTF8 0x02 /* Key is bytes here, but was supplied as utf8. */ |
4b5190b5 |
328 | #define HVhek_REHASH 0x04 /* This key is in an hv using a custom HASH . */ |
19692e8d |
329 | #define HVhek_FREEKEY 0x100 /* Internal flag to say key is malloc()ed. */ |
e16e2ff8 |
330 | #define HVhek_PLACEHOLD 0x200 /* Internal flag to create placeholder. |
331 | * (may change, but Storable is a core module) */ |
19692e8d |
332 | #define HVhek_MASK 0xFF |
333 | |
fdcd69b6 |
334 | /* Which flags enable HvHASKFLAGS? Somewhat a hack on a hack, as |
335 | HVhek_REHASH is only needed because the rehash flag has to be duplicated |
336 | into all keys as hv_iternext has no access to the hash flags. At this |
337 | point Storable's tests get upset, because sometimes hashes are "keyed" |
338 | and sometimes not, depending on the order of data insertion, and whether |
339 | it triggered rehashing. So currently HVhek_REHAS is exempt. |
340 | */ |
341 | |
342 | #define HVhek_ENABLEHVKFLAGS (HVhek_MASK - HVhek_REHASH) |
343 | |
19692e8d |
344 | #define HEK_UTF8(hek) (HEK_FLAGS(hek) & HVhek_UTF8) |
345 | #define HEK_UTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_UTF8) |
346 | #define HEK_UTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_UTF8) |
347 | #define HEK_WASUTF8(hek) (HEK_FLAGS(hek) & HVhek_WASUTF8) |
348 | #define HEK_WASUTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_WASUTF8) |
349 | #define HEK_WASUTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_WASUTF8) |
4b5190b5 |
350 | #define HEK_REHASH(hek) (HEK_FLAGS(hek) & HVhek_REHASH) |
351 | #define HEK_REHASH_on(hek) (HEK_FLAGS(hek) |= HVhek_REHASH) |
d18c6117 |
352 | |
5cbe4eec |
353 | /* calculate HV array allocation */ |
36768cf4 |
354 | #ifndef PERL_USE_LARGE_HV_ALLOC |
355 | /* Default to allocating the correct size - default to assuming that malloc() |
356 | is not broken and is efficient at allocating blocks sized at powers-of-two. |
357 | */ |
d18c6117 |
358 | # define PERL_HV_ARRAY_ALLOC_BYTES(size) ((size) * sizeof(HE*)) |
359 | #else |
360 | # define MALLOC_OVERHEAD 16 |
361 | # define PERL_HV_ARRAY_ALLOC_BYTES(size) \ |
362 | (((size) < 64) \ |
363 | ? (size) * sizeof(HE*) \ |
364 | : (size) * sizeof(HE*) * 2 - MALLOC_OVERHEAD) |
365 | #endif |
37d85e3a |
366 | |
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367 | /* Flags for hv_iternext_flags. */ |
368 | #define HV_ITERNEXT_WANTPLACEHOLDERS 0x01 /* Don't skip placeholders. */ |
369 | |
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370 | /* available as a function in hv.c */ |
371 | #define Perl_sharepvn(sv, len, hash) HEK_KEY(share_hek(sv, len, hash)) |
372 | #define sharepvn(sv, len, hash) Perl_sharepvn(sv, len, hash) |
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373 | |
374 | /* |
375 | * Local variables: |
376 | * c-indentation-style: bsd |
377 | * c-basic-offset: 4 |
378 | * indent-tabs-mode: t |
379 | * End: |
380 | * |
381 | * ex: set ts=8 sts=4 sw=4 noet: |
382 | */ |