Commit | Line | Data |
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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 LW |
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 LW |
9 | */ |
10 | ||
5cbe4eec | 11 | /* entry in hash value chain */ |
79072805 | 12 | struct he { |
6f51351d NC |
13 | /* Keep hent_next first in this structure, because sv_free_arenas take |
14 | advantage of this to share code between the he arenas and the SV | |
15 | body arenas */ | |
5cbe4eec MLF |
16 | HE *hent_next; /* next entry in chain */ |
17 | HEK *hent_hek; /* hash key */ | |
18 | SV *hent_val; /* scalar value that was hashed */ | |
bbce6d69 | 19 | }; |
20 | ||
5cbe4eec | 21 | /* hash key -- defined separately for use as shared pointer */ |
ff68c719 | 22 | struct hek { |
5cbe4eec MLF |
23 | U32 hek_hash; /* hash of key */ |
24 | I32 hek_len; /* length of hash key */ | |
25 | char hek_key[1]; /* variable-length hash key */ | |
e05949c7 | 26 | /* the hash-key is \0-terminated */ |
1e54db1a JH |
27 | /* after the \0 there is a byte for flags, such as whether the key |
28 | is UTF-8 */ | |
79072805 LW |
29 | }; |
30 | ||
cbae3960 NC |
31 | struct shared_he { |
32 | struct he shared_he_he; | |
33 | struct hek shared_he_hek; | |
34 | }; | |
bfcb3514 NC |
35 | |
36 | /* Subject to change. | |
37 | Don't access this directly. | |
38 | */ | |
39 | struct xpvhv_aux { | |
7423f6db | 40 | HEK *xhv_name; /* name, if a symbol table */ |
bfcb3514 NC |
41 | HE *xhv_eiter; /* current entry of iterator */ |
42 | I32 xhv_riter; /* current root of iterator */ | |
43 | }; | |
44 | ||
5cbe4eec | 45 | /* hash structure: */ |
6ee623d5 | 46 | /* This structure must match the beginning of struct xpvmg in sv.h. */ |
79072805 | 47 | struct xpvhv { |
311a25d9 | 48 | NV xnv_nv; /* numeric value, if any */ |
463ee0b2 LW |
49 | STRLEN xhv_fill; /* how full xhv_array currently is */ |
50 | STRLEN xhv_max; /* subscript of last element of xhv_array */ | |
e4305a63 | 51 | union { |
311a25d9 NC |
52 | IV xivu_iv; /* integer value or pv offset */ |
53 | UV xivu_uv; | |
54 | void * xivu_p1; | |
55 | } xiv_u; | |
79072805 LW |
56 | MAGIC* xmg_magic; /* magic for scalar array */ |
57 | HV* xmg_stash; /* class package */ | |
79072805 LW |
58 | }; |
59 | ||
311a25d9 | 60 | #define xhv_keys xiv_u.xivu_iv |
e4305a63 | 61 | |
c5f87f51 | 62 | #if 0 |
59813432 | 63 | typedef struct xpvhv xpvhv_allocated; |
9f1501b2 NC |
64 | #else |
65 | typedef struct { | |
66 | STRLEN xhv_fill; /* how full xhv_array currently is */ | |
67 | STRLEN xhv_max; /* subscript of last element of xhv_array */ | |
68 | union { | |
311a25d9 NC |
69 | IV xivu_iv; /* integer value or pv offset */ |
70 | UV xivu_uv; | |
71 | void * xivu_p1; | |
72 | } xiv_u; | |
9f1501b2 NC |
73 | MAGIC* xmg_magic; /* magic for scalar array */ |
74 | HV* xmg_stash; /* class package */ | |
75 | } xpvhv_allocated; | |
76 | #endif | |
e4305a63 | 77 | |
5cbe4eec | 78 | /* hash a key */ |
5afd6d42 JH |
79 | /* FYI: This is the "One-at-a-Time" algorithm by Bob Jenkins |
80 | * from requirements by Colin Plumb. | |
81 | * (http://burtleburtle.net/bob/hash/doobs.html) */ | |
82 | /* The use of a temporary pointer and the casting games | |
83 | * is needed to serve the dual purposes of | |
84 | * (a) the hashed data being interpreted as "unsigned char" (new since 5.8, | |
df805c3e | 85 | * a "char" can be either signed or unsigned, depending on the compiler) |
5afd6d42 | 86 | * (b) catering for old code that uses a "char" |
830b38bd | 87 | * |
504f80c1 JH |
88 | * The "hash seed" feature was added in Perl 5.8.1 to perturb the results |
89 | * to avoid "algorithmic complexity attacks". | |
830b38bd JH |
90 | * |
91 | * If USE_HASH_SEED is defined, hash randomisation is done by default | |
92 | * If USE_HASH_SEED_EXPLICIT is defined, hash randomisation is done | |
93 | * only if the environment variable PERL_HASH_SEED is set. | |
94 | * For maximal control, one can define PERL_HASH_SEED. | |
90ce55a1 | 95 | * (see also perl.c:perl_parse()). |
5afd6d42 | 96 | */ |
830b38bd JH |
97 | #ifndef PERL_HASH_SEED |
98 | # if defined(USE_HASH_SEED) || defined(USE_HASH_SEED_EXPLICIT) | |
99 | # define PERL_HASH_SEED PL_hash_seed | |
100 | # else | |
101 | # define PERL_HASH_SEED 0 | |
102 | # endif | |
504f80c1 | 103 | #endif |
bf6bd887 | 104 | #define PERL_HASH(hash,str,len) \ |
105 | STMT_START { \ | |
0bd48802 | 106 | register const char * const s_PeRlHaSh_tmp = str; \ |
5afd6d42 | 107 | register const unsigned char *s_PeRlHaSh = (const unsigned char *)s_PeRlHaSh_tmp; \ |
bf6bd887 | 108 | register I32 i_PeRlHaSh = len; \ |
504f80c1 | 109 | register U32 hash_PeRlHaSh = PERL_HASH_SEED; \ |
a6fe520e MLF |
110 | while (i_PeRlHaSh--) { \ |
111 | hash_PeRlHaSh += *s_PeRlHaSh++; \ | |
112 | hash_PeRlHaSh += (hash_PeRlHaSh << 10); \ | |
113 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 6); \ | |
114 | } \ | |
115 | hash_PeRlHaSh += (hash_PeRlHaSh << 3); \ | |
116 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 11); \ | |
4fee5c71 | 117 | (hash) = (hash_PeRlHaSh + (hash_PeRlHaSh << 15)); \ |
bf6bd887 | 118 | } STMT_END |
119 | ||
3d78eb94 NC |
120 | /* Only hv.c and mod_perl should be doing this. */ |
121 | #ifdef PERL_HASH_INTERNAL_ACCESS | |
4b5190b5 NC |
122 | #define PERL_HASH_INTERNAL(hash,str,len) \ |
123 | STMT_START { \ | |
0bd48802 | 124 | register const char * const s_PeRlHaSh_tmp = str; \ |
4b5190b5 NC |
125 | register const unsigned char *s_PeRlHaSh = (const unsigned char *)s_PeRlHaSh_tmp; \ |
126 | register I32 i_PeRlHaSh = len; \ | |
008fb0c0 | 127 | register U32 hash_PeRlHaSh = PL_rehash_seed; \ |
4b5190b5 NC |
128 | while (i_PeRlHaSh--) { \ |
129 | hash_PeRlHaSh += *s_PeRlHaSh++; \ | |
130 | hash_PeRlHaSh += (hash_PeRlHaSh << 10); \ | |
131 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 6); \ | |
132 | } \ | |
133 | hash_PeRlHaSh += (hash_PeRlHaSh << 3); \ | |
134 | hash_PeRlHaSh ^= (hash_PeRlHaSh >> 11); \ | |
135 | (hash) = (hash_PeRlHaSh + (hash_PeRlHaSh << 15)); \ | |
136 | } STMT_END | |
137 | #endif | |
138 | ||
954c1994 | 139 | /* |
ccfc67b7 JH |
140 | =head1 Hash Manipulation Functions |
141 | ||
954c1994 GS |
142 | =for apidoc AmU||HEf_SVKEY |
143 | This flag, used in the length slot of hash entries and magic structures, | |
d1be9408 | 144 | specifies the structure contains an C<SV*> pointer where a C<char*> pointer |
954c1994 GS |
145 | is to be expected. (For information only--not to be used). |
146 | ||
ccfc67b7 JH |
147 | =head1 Handy Values |
148 | ||
954c1994 GS |
149 | =for apidoc AmU||Nullhv |
150 | Null HV pointer. | |
151 | ||
ccfc67b7 JH |
152 | =head1 Hash Manipulation Functions |
153 | ||
954c1994 | 154 | =for apidoc Am|char*|HvNAME|HV* stash |
9282b5fd SH |
155 | Returns the package name of a stash, or NULL if C<stash> isn't a stash. |
156 | See C<SvSTASH>, C<CvSTASH>. | |
954c1994 GS |
157 | |
158 | =for apidoc Am|void*|HeKEY|HE* he | |
159 | Returns the actual pointer stored in the key slot of the hash entry. The | |
160 | pointer may be either C<char*> or C<SV*>, depending on the value of | |
161 | C<HeKLEN()>. Can be assigned to. The C<HePV()> or C<HeSVKEY()> macros are | |
162 | usually preferable for finding the value of a key. | |
163 | ||
164 | =for apidoc Am|STRLEN|HeKLEN|HE* he | |
165 | If this is negative, and amounts to C<HEf_SVKEY>, it indicates the entry | |
166 | holds an C<SV*> key. Otherwise, holds the actual length of the key. Can | |
167 | be assigned to. The C<HePV()> macro is usually preferable for finding key | |
168 | lengths. | |
169 | ||
170 | =for apidoc Am|SV*|HeVAL|HE* he | |
171 | Returns the value slot (type C<SV*>) stored in the hash entry. | |
172 | ||
173 | =for apidoc Am|U32|HeHASH|HE* he | |
174 | Returns the computed hash stored in the hash entry. | |
175 | ||
176 | =for apidoc Am|char*|HePV|HE* he|STRLEN len | |
177 | Returns the key slot of the hash entry as a C<char*> value, doing any | |
178 | necessary dereferencing of possibly C<SV*> keys. The length of the string | |
179 | is placed in C<len> (this is a macro, so do I<not> use C<&len>). If you do | |
180 | not care about what the length of the key is, you may use the global | |
181 | variable C<PL_na>, though this is rather less efficient than using a local | |
182 | variable. Remember though, that hash keys in perl are free to contain | |
183 | embedded nulls, so using C<strlen()> or similar is not a good way to find | |
184 | the length of hash keys. This is very similar to the C<SvPV()> macro | |
185 | described elsewhere in this document. | |
186 | ||
187 | =for apidoc Am|SV*|HeSVKEY|HE* he | |
188 | Returns the key as an C<SV*>, or C<Nullsv> if the hash entry does not | |
189 | contain an C<SV*> key. | |
190 | ||
191 | =for apidoc Am|SV*|HeSVKEY_force|HE* he | |
192 | Returns the key as an C<SV*>. Will create and return a temporary mortal | |
193 | C<SV*> if the hash entry contains only a C<char*> key. | |
194 | ||
195 | =for apidoc Am|SV*|HeSVKEY_set|HE* he|SV* sv | |
196 | Sets the key to a given C<SV*>, taking care to set the appropriate flags to | |
197 | indicate the presence of an C<SV*> key, and returns the same | |
198 | C<SV*>. | |
199 | ||
200 | =cut | |
201 | */ | |
bf6bd887 | 202 | |
bf5b86ae | 203 | /* these hash entry flags ride on hent_klen (for use only in magic/tied HVs) */ |
d1be9408 | 204 | #define HEf_SVKEY -2 /* hent_key is an SV* */ |
bf6bd887 | 205 | |
206 | ||
79072805 | 207 | #define Nullhv Null(HV*) |
43e6e717 | 208 | #define HvARRAY(hv) ((hv)->sv_u.svu_hash) |
79072805 | 209 | #define HvFILL(hv) ((XPVHV*) SvANY(hv))->xhv_fill |
463ee0b2 | 210 | #define HvMAX(hv) ((XPVHV*) SvANY(hv))->xhv_max |
b79f7545 NC |
211 | /* This quite intentionally does no flag checking first. That's your |
212 | responsibility. */ | |
213 | #define HvAUX(hv) ((struct xpvhv_aux*)&(HvARRAY(hv)[HvMAX(hv)+1])) | |
bfcb3514 NC |
214 | #define HvRITER(hv) (*Perl_hv_riter_p(aTHX_ (HV*)(hv))) |
215 | #define HvEITER(hv) (*Perl_hv_eiter_p(aTHX_ (HV*)(hv))) | |
216 | #define HvRITER_set(hv,r) Perl_hv_riter_set(aTHX_ (HV*)(hv), r) | |
217 | #define HvEITER_set(hv,e) Perl_hv_eiter_set(aTHX_ (HV*)(hv), e) | |
b79f7545 NC |
218 | #define HvRITER_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_riter : -1) |
219 | #define HvEITER_get(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_eiter : 0) | |
7423f6db | 220 | #define HvNAME(hv) HvNAME_get(hv) |
bfcb3514 NC |
221 | /* FIXME - all of these should use a UTF8 aware API, which should also involve |
222 | getting the length. */ | |
9b9d0b15 | 223 | /* This macro may go away without notice. */ |
b79f7545 NC |
224 | #define HvNAME_HEK(hv) (SvOOK(hv) ? HvAUX(hv)->xhv_name : 0) |
225 | #define HvNAME_get(hv) ((SvOOK(hv) && (HvAUX(hv)->xhv_name)) \ | |
226 | ? HEK_KEY(HvAUX(hv)->xhv_name) : 0) | |
227 | #define HvNAMELEN_get(hv) ((SvOOK(hv) && (HvAUX(hv)->xhv_name)) \ | |
228 | ? HEK_LEN(HvAUX(hv)->xhv_name) : 0) | |
a0d0e21e | 229 | |
8aacddc1 NIS |
230 | /* the number of keys (including any placeholers) */ |
231 | #define XHvTOTALKEYS(xhv) ((xhv)->xhv_keys) | |
232 | ||
8aacddc1 NIS |
233 | /* |
234 | * HvKEYS gets the number of keys that actually exist(), and is provided | |
235 | * for backwards compatibility with old XS code. The core uses HvUSEDKEYS | |
236 | * (keys, excluding placeholdes) and HvTOTALKEYS (including placeholders) | |
237 | */ | |
ca732855 NC |
238 | #define HvKEYS(hv) HvUSEDKEYS(hv) |
239 | #define HvUSEDKEYS(hv) (HvTOTALKEYS(hv) - HvPLACEHOLDERS_get(hv)) | |
8aacddc1 | 240 | #define HvTOTALKEYS(hv) XHvTOTALKEYS((XPVHV*) SvANY(hv)) |
ca732855 NC |
241 | #define HvPLACEHOLDERS(hv) (*Perl_hv_placeholders_p(aTHX_ (HV*)hv)) |
242 | #define HvPLACEHOLDERS_get(hv) (SvMAGIC(hv) ? Perl_hv_placeholders_get(aTHX_ (HV*)hv) : 0) | |
243 | #define HvPLACEHOLDERS_set(hv,p) Perl_hv_placeholders_set(aTHX_ (HV*)hv, p) | |
8aacddc1 | 244 | |
bf6bd887 | 245 | #define HvSHAREKEYS(hv) (SvFLAGS(hv) & SVphv_SHAREKEYS) |
246 | #define HvSHAREKEYS_on(hv) (SvFLAGS(hv) |= SVphv_SHAREKEYS) | |
247 | #define HvSHAREKEYS_off(hv) (SvFLAGS(hv) &= ~SVphv_SHAREKEYS) | |
248 | ||
19692e8d NC |
249 | /* This is an optimisation flag. It won't be set if all hash keys have a 0 |
250 | * flag. Currently the only flags relate to utf8. | |
251 | * Hence it won't be set if all keys are 8 bit only. It will be set if any key | |
252 | * is utf8 (including 8 bit keys that were entered as utf8, and need upgrading | |
253 | * when retrieved during iteration. It may still be set when there are no longer | |
254 | * any utf8 keys. | |
fdcd69b6 | 255 | * See HVhek_ENABLEHVKFLAGS for the trigger. |
19692e8d NC |
256 | */ |
257 | #define HvHASKFLAGS(hv) (SvFLAGS(hv) & SVphv_HASKFLAGS) | |
258 | #define HvHASKFLAGS_on(hv) (SvFLAGS(hv) |= SVphv_HASKFLAGS) | |
259 | #define HvHASKFLAGS_off(hv) (SvFLAGS(hv) &= ~SVphv_HASKFLAGS) | |
574c8022 | 260 | |
bf5b86ae GS |
261 | #define HvLAZYDEL(hv) (SvFLAGS(hv) & SVphv_LAZYDEL) |
262 | #define HvLAZYDEL_on(hv) (SvFLAGS(hv) |= SVphv_LAZYDEL) | |
263 | #define HvLAZYDEL_off(hv) (SvFLAGS(hv) &= ~SVphv_LAZYDEL) | |
264 | ||
4b5190b5 NC |
265 | #define HvREHASH(hv) (SvFLAGS(hv) & SVphv_REHASH) |
266 | #define HvREHASH_on(hv) (SvFLAGS(hv) |= SVphv_REHASH) | |
267 | #define HvREHASH_off(hv) (SvFLAGS(hv) &= ~SVphv_REHASH) | |
268 | ||
a0d0e21e LW |
269 | /* Maybe amagical: */ |
270 | /* #define HV_AMAGICmb(hv) (SvFLAGS(hv) & (SVpgv_badAM | SVpgv_AM)) */ | |
271 | ||
272 | #define HV_AMAGIC(hv) (SvFLAGS(hv) & SVpgv_AM) | |
273 | #define HV_AMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_AM) | |
274 | #define HV_AMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_AM) | |
275 | ||
276 | /* | |
277 | #define HV_AMAGICbad(hv) (SvFLAGS(hv) & SVpgv_badAM) | |
278 | #define HV_badAMAGIC_on(hv) (SvFLAGS(hv) |= SVpgv_badAM) | |
279 | #define HV_badAMAGIC_off(hv) (SvFLAGS(hv) &= ~SVpgv_badAM) | |
280 | */ | |
bf6bd887 | 281 | |
282 | #define Nullhe Null(HE*) | |
283 | #define HeNEXT(he) (he)->hent_next | |
ff68c719 | 284 | #define HeKEY_hek(he) (he)->hent_hek |
285 | #define HeKEY(he) HEK_KEY(HeKEY_hek(he)) | |
bbce6d69 | 286 | #define HeKEY_sv(he) (*(SV**)HeKEY(he)) |
ff68c719 | 287 | #define HeKLEN(he) HEK_LEN(HeKEY_hek(he)) |
da58a35d | 288 | #define HeKUTF8(he) HEK_UTF8(HeKEY_hek(he)) |
19692e8d | 289 | #define HeKWASUTF8(he) HEK_WASUTF8(HeKEY_hek(he)) |
4b5190b5 | 290 | #define HeKREHASH(he) HEK_REHASH(HeKEY_hek(he)) |
da58a35d | 291 | #define HeKLEN_UTF8(he) (HeKUTF8(he) ? -HeKLEN(he) : HeKLEN(he)) |
19692e8d | 292 | #define HeKFLAGS(he) HEK_FLAGS(HeKEY_hek(he)) |
bf6bd887 | 293 | #define HeVAL(he) (he)->hent_val |
ff68c719 | 294 | #define HeHASH(he) HEK_HASH(HeKEY_hek(he)) |
1e422769 | 295 | #define HePV(he,lp) ((HeKLEN(he) == HEf_SVKEY) ? \ |
296 | SvPV(HeKEY_sv(he),lp) : \ | |
297 | (((lp = HeKLEN(he)) >= 0) ? \ | |
298 | HeKEY(he) : Nullch)) | |
299 | ||
bbce6d69 | 300 | #define HeSVKEY(he) ((HeKEY(he) && \ |
301 | HeKLEN(he) == HEf_SVKEY) ? \ | |
302 | HeKEY_sv(he) : Nullsv) | |
303 | ||
304 | #define HeSVKEY_force(he) (HeKEY(he) ? \ | |
305 | ((HeKLEN(he) == HEf_SVKEY) ? \ | |
306 | HeKEY_sv(he) : \ | |
79cb57f6 | 307 | sv_2mortal(newSVpvn(HeKEY(he), \ |
bbce6d69 | 308 | HeKLEN(he)))) : \ |
3280af22 | 309 | &PL_sv_undef) |
1e422769 | 310 | #define HeSVKEY_set(he,sv) ((HeKLEN(he) = HEf_SVKEY), (HeKEY_sv(he) = sv)) |
bbce6d69 | 311 | |
ff68c719 | 312 | #define Nullhek Null(HEK*) |
71be2cbc | 313 | #define HEK_BASESIZE STRUCT_OFFSET(HEK, hek_key[0]) |
ff68c719 | 314 | #define HEK_HASH(hek) (hek)->hek_hash |
315 | #define HEK_LEN(hek) (hek)->hek_len | |
316 | #define HEK_KEY(hek) (hek)->hek_key | |
19692e8d NC |
317 | #define HEK_FLAGS(hek) (*((unsigned char *)(HEK_KEY(hek))+HEK_LEN(hek)+1)) |
318 | ||
319 | #define HVhek_UTF8 0x01 /* Key is utf8 encoded. */ | |
320 | #define HVhek_WASUTF8 0x02 /* Key is bytes here, but was supplied as utf8. */ | |
4b5190b5 | 321 | #define HVhek_REHASH 0x04 /* This key is in an hv using a custom HASH . */ |
19692e8d | 322 | #define HVhek_FREEKEY 0x100 /* Internal flag to say key is malloc()ed. */ |
e16e2ff8 NC |
323 | #define HVhek_PLACEHOLD 0x200 /* Internal flag to create placeholder. |
324 | * (may change, but Storable is a core module) */ | |
19692e8d NC |
325 | #define HVhek_MASK 0xFF |
326 | ||
fdcd69b6 NC |
327 | /* Which flags enable HvHASKFLAGS? Somewhat a hack on a hack, as |
328 | HVhek_REHASH is only needed because the rehash flag has to be duplicated | |
329 | into all keys as hv_iternext has no access to the hash flags. At this | |
330 | point Storable's tests get upset, because sometimes hashes are "keyed" | |
331 | and sometimes not, depending on the order of data insertion, and whether | |
332 | it triggered rehashing. So currently HVhek_REHAS is exempt. | |
333 | */ | |
334 | ||
335 | #define HVhek_ENABLEHVKFLAGS (HVhek_MASK - HVhek_REHASH) | |
336 | ||
19692e8d NC |
337 | #define HEK_UTF8(hek) (HEK_FLAGS(hek) & HVhek_UTF8) |
338 | #define HEK_UTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_UTF8) | |
339 | #define HEK_UTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_UTF8) | |
340 | #define HEK_WASUTF8(hek) (HEK_FLAGS(hek) & HVhek_WASUTF8) | |
341 | #define HEK_WASUTF8_on(hek) (HEK_FLAGS(hek) |= HVhek_WASUTF8) | |
342 | #define HEK_WASUTF8_off(hek) (HEK_FLAGS(hek) &= ~HVhek_WASUTF8) | |
4b5190b5 NC |
343 | #define HEK_REHASH(hek) (HEK_FLAGS(hek) & HVhek_REHASH) |
344 | #define HEK_REHASH_on(hek) (HEK_FLAGS(hek) |= HVhek_REHASH) | |
d18c6117 | 345 | |
5cbe4eec | 346 | /* calculate HV array allocation */ |
36768cf4 NC |
347 | #ifndef PERL_USE_LARGE_HV_ALLOC |
348 | /* Default to allocating the correct size - default to assuming that malloc() | |
349 | is not broken and is efficient at allocating blocks sized at powers-of-two. | |
350 | */ | |
d18c6117 GS |
351 | # define PERL_HV_ARRAY_ALLOC_BYTES(size) ((size) * sizeof(HE*)) |
352 | #else | |
353 | # define MALLOC_OVERHEAD 16 | |
354 | # define PERL_HV_ARRAY_ALLOC_BYTES(size) \ | |
355 | (((size) < 64) \ | |
356 | ? (size) * sizeof(HE*) \ | |
357 | : (size) * sizeof(HE*) * 2 - MALLOC_OVERHEAD) | |
358 | #endif | |
37d85e3a | 359 | |
e16e2ff8 NC |
360 | /* Flags for hv_iternext_flags. */ |
361 | #define HV_ITERNEXT_WANTPLACEHOLDERS 0x01 /* Don't skip placeholders. */ | |
362 | ||
7a7b9979 | 363 | #define hv_iternext(hv) hv_iternext_flags(hv, 0) |
bc5cdc23 | 364 | #define hv_magic(hv, gv, how) sv_magic((SV*)(hv), (SV*)(gv), how, Nullch, 0) |
7a7b9979 | 365 | |
37d85e3a JH |
366 | /* available as a function in hv.c */ |
367 | #define Perl_sharepvn(sv, len, hash) HEK_KEY(share_hek(sv, len, hash)) | |
368 | #define sharepvn(sv, len, hash) Perl_sharepvn(sv, len, hash) | |
bfcb3514 | 369 | |
d1db91c6 NC |
370 | #define share_hek_hek(hek) \ |
371 | (++(((struct shared_he *)(((char *)hek) \ | |
372 | - STRUCT_OFFSET(struct shared_he, \ | |
373 | shared_he_hek))) \ | |
374 | ->shared_he_he.hent_val), \ | |
375 | hek) | |
376 | ||
bfcb3514 NC |
377 | /* |
378 | * Local variables: | |
379 | * c-indentation-style: bsd | |
380 | * c-basic-offset: 4 | |
381 | * indent-tabs-mode: t | |
382 | * End: | |
383 | * | |
384 | * ex: set ts=8 sts=4 sw=4 noet: | |
385 | */ |