Commit | Line | Data |
a0d0e21e |
1 | /* hv.c |
79072805 |
2 | * |
4bb101f2 |
3 | * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
b94e2f88 |
4 | * 2000, 2001, 2002, 2003, 2004, 2005, 2006, 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 | * |
a0d0e21e |
9 | */ |
10 | |
11 | /* |
12 | * "I sit beside the fire and think of all that I have seen." --Bilbo |
79072805 |
13 | */ |
14 | |
d5afce77 |
15 | /* |
16 | =head1 Hash Manipulation Functions |
166f8a29 |
17 | |
18 | A HV structure represents a Perl hash. It consists mainly of an array |
19 | of pointers, each of which points to a linked list of HE structures. The |
20 | array is indexed by the hash function of the key, so each linked list |
21 | represents all the hash entries with the same hash value. Each HE contains |
22 | a pointer to the actual value, plus a pointer to a HEK structure which |
23 | holds the key and hash value. |
24 | |
25 | =cut |
26 | |
d5afce77 |
27 | */ |
28 | |
79072805 |
29 | #include "EXTERN.h" |
864dbfa3 |
30 | #define PERL_IN_HV_C |
3d78eb94 |
31 | #define PERL_HASH_INTERNAL_ACCESS |
79072805 |
32 | #include "perl.h" |
33 | |
d8012aaf |
34 | #define HV_MAX_LENGTH_BEFORE_SPLIT 14 |
fdcd69b6 |
35 | |
d75ce684 |
36 | static const char S_strtab_error[] |
5d2b1485 |
37 | = "Cannot modify shared string table in hv_%s"; |
38 | |
cac9b346 |
39 | STATIC void |
40 | S_more_he(pTHX) |
41 | { |
97aff369 |
42 | dVAR; |
cac9b346 |
43 | HE* he; |
44 | HE* heend; |
a02a5408 |
45 | Newx(he, PERL_ARENA_SIZE/sizeof(HE), HE); |
6a93a7e5 |
46 | HeNEXT(he) = (HE*) PL_body_arenaroots[HE_SVSLOT]; |
47 | PL_body_arenaroots[HE_SVSLOT] = he; |
cac9b346 |
48 | |
49 | heend = &he[PERL_ARENA_SIZE / sizeof(HE) - 1]; |
6a93a7e5 |
50 | PL_body_roots[HE_SVSLOT] = ++he; |
cac9b346 |
51 | while (he < heend) { |
52 | HeNEXT(he) = (HE*)(he + 1); |
53 | he++; |
54 | } |
55 | HeNEXT(he) = 0; |
56 | } |
57 | |
c941fb51 |
58 | #ifdef PURIFY |
59 | |
60 | #define new_HE() (HE*)safemalloc(sizeof(HE)) |
61 | #define del_HE(p) safefree((char*)p) |
62 | |
63 | #else |
64 | |
76e3520e |
65 | STATIC HE* |
cea2e8a9 |
66 | S_new_he(pTHX) |
4633a7c4 |
67 | { |
97aff369 |
68 | dVAR; |
4633a7c4 |
69 | HE* he; |
0bd48802 |
70 | void ** const root = &PL_body_roots[HE_SVSLOT]; |
6a93a7e5 |
71 | |
333f433b |
72 | LOCK_SV_MUTEX; |
6a93a7e5 |
73 | if (!*root) |
cac9b346 |
74 | S_more_he(aTHX); |
6a93a7e5 |
75 | he = *root; |
76 | *root = HeNEXT(he); |
333f433b |
77 | UNLOCK_SV_MUTEX; |
78 | return he; |
4633a7c4 |
79 | } |
80 | |
c941fb51 |
81 | #define new_HE() new_he() |
82 | #define del_HE(p) \ |
83 | STMT_START { \ |
84 | LOCK_SV_MUTEX; \ |
6a93a7e5 |
85 | HeNEXT(p) = (HE*)(PL_body_roots[HE_SVSLOT]); \ |
86 | PL_body_roots[HE_SVSLOT] = p; \ |
c941fb51 |
87 | UNLOCK_SV_MUTEX; \ |
88 | } STMT_END |
d33b2eba |
89 | |
d33b2eba |
90 | |
d33b2eba |
91 | |
92 | #endif |
93 | |
76e3520e |
94 | STATIC HEK * |
19692e8d |
95 | S_save_hek_flags(pTHX_ const char *str, I32 len, U32 hash, int flags) |
bbce6d69 |
96 | { |
35a4481c |
97 | const int flags_masked = flags & HVhek_MASK; |
bbce6d69 |
98 | char *k; |
99 | register HEK *hek; |
1c846c1f |
100 | |
a02a5408 |
101 | Newx(k, HEK_BASESIZE + len + 2, char); |
bbce6d69 |
102 | hek = (HEK*)k; |
ff68c719 |
103 | Copy(str, HEK_KEY(hek), len, char); |
e05949c7 |
104 | HEK_KEY(hek)[len] = 0; |
ff68c719 |
105 | HEK_LEN(hek) = len; |
106 | HEK_HASH(hek) = hash; |
dcf933a4 |
107 | HEK_FLAGS(hek) = (unsigned char)flags_masked; |
108 | |
109 | if (flags & HVhek_FREEKEY) |
110 | Safefree(str); |
bbce6d69 |
111 | return hek; |
112 | } |
113 | |
4a31713e |
114 | /* free the pool of temporary HE/HEK pairs returned by hv_fetch_ent |
dd28f7bb |
115 | * for tied hashes */ |
116 | |
117 | void |
118 | Perl_free_tied_hv_pool(pTHX) |
119 | { |
97aff369 |
120 | dVAR; |
dd28f7bb |
121 | HE *he = PL_hv_fetch_ent_mh; |
122 | while (he) { |
9d4ba2ae |
123 | HE * const ohe = he; |
dd28f7bb |
124 | Safefree(HeKEY_hek(he)); |
dd28f7bb |
125 | he = HeNEXT(he); |
126 | del_HE(ohe); |
127 | } |
bf9cdc68 |
128 | PL_hv_fetch_ent_mh = Nullhe; |
dd28f7bb |
129 | } |
130 | |
d18c6117 |
131 | #if defined(USE_ITHREADS) |
0bff533c |
132 | HEK * |
133 | Perl_hek_dup(pTHX_ HEK *source, CLONE_PARAMS* param) |
134 | { |
658b4a4a |
135 | HEK *shared = (HEK*)ptr_table_fetch(PL_ptr_table, source); |
9d4ba2ae |
136 | |
137 | PERL_UNUSED_ARG(param); |
0bff533c |
138 | |
139 | if (shared) { |
140 | /* We already shared this hash key. */ |
454f1e26 |
141 | (void)share_hek_hek(shared); |
0bff533c |
142 | } |
143 | else { |
658b4a4a |
144 | shared |
6e838c70 |
145 | = share_hek_flags(HEK_KEY(source), HEK_LEN(source), |
146 | HEK_HASH(source), HEK_FLAGS(source)); |
658b4a4a |
147 | ptr_table_store(PL_ptr_table, source, shared); |
0bff533c |
148 | } |
658b4a4a |
149 | return shared; |
0bff533c |
150 | } |
151 | |
d18c6117 |
152 | HE * |
5c4138a0 |
153 | Perl_he_dup(pTHX_ const HE *e, bool shared, CLONE_PARAMS* param) |
d18c6117 |
154 | { |
155 | HE *ret; |
156 | |
157 | if (!e) |
158 | return Nullhe; |
7766f137 |
159 | /* look for it in the table first */ |
160 | ret = (HE*)ptr_table_fetch(PL_ptr_table, e); |
161 | if (ret) |
162 | return ret; |
163 | |
164 | /* create anew and remember what it is */ |
d33b2eba |
165 | ret = new_HE(); |
7766f137 |
166 | ptr_table_store(PL_ptr_table, e, ret); |
167 | |
d2d73c3e |
168 | HeNEXT(ret) = he_dup(HeNEXT(e),shared, param); |
dd28f7bb |
169 | if (HeKLEN(e) == HEf_SVKEY) { |
170 | char *k; |
a02a5408 |
171 | Newx(k, HEK_BASESIZE + sizeof(SV*), char); |
dd28f7bb |
172 | HeKEY_hek(ret) = (HEK*)k; |
d2d73c3e |
173 | HeKEY_sv(ret) = SvREFCNT_inc(sv_dup(HeKEY_sv(e), param)); |
dd28f7bb |
174 | } |
c21d1a0f |
175 | else if (shared) { |
0bff533c |
176 | /* This is hek_dup inlined, which seems to be important for speed |
177 | reasons. */ |
1b6737cc |
178 | HEK * const source = HeKEY_hek(e); |
658b4a4a |
179 | HEK *shared = (HEK*)ptr_table_fetch(PL_ptr_table, source); |
c21d1a0f |
180 | |
181 | if (shared) { |
182 | /* We already shared this hash key. */ |
454f1e26 |
183 | (void)share_hek_hek(shared); |
c21d1a0f |
184 | } |
185 | else { |
658b4a4a |
186 | shared |
6e838c70 |
187 | = share_hek_flags(HEK_KEY(source), HEK_LEN(source), |
188 | HEK_HASH(source), HEK_FLAGS(source)); |
658b4a4a |
189 | ptr_table_store(PL_ptr_table, source, shared); |
c21d1a0f |
190 | } |
658b4a4a |
191 | HeKEY_hek(ret) = shared; |
c21d1a0f |
192 | } |
d18c6117 |
193 | else |
19692e8d |
194 | HeKEY_hek(ret) = save_hek_flags(HeKEY(e), HeKLEN(e), HeHASH(e), |
195 | HeKFLAGS(e)); |
d2d73c3e |
196 | HeVAL(ret) = SvREFCNT_inc(sv_dup(HeVAL(e), param)); |
d18c6117 |
197 | return ret; |
198 | } |
199 | #endif /* USE_ITHREADS */ |
200 | |
1b1f1335 |
201 | static void |
2393f1b9 |
202 | S_hv_notallowed(pTHX_ int flags, const char *key, I32 klen, |
203 | const char *msg) |
1b1f1335 |
204 | { |
1b6737cc |
205 | SV * const sv = sv_newmortal(); |
19692e8d |
206 | if (!(flags & HVhek_FREEKEY)) { |
1b1f1335 |
207 | sv_setpvn(sv, key, klen); |
208 | } |
209 | else { |
210 | /* Need to free saved eventually assign to mortal SV */ |
34c3c4e3 |
211 | /* XXX is this line an error ???: SV *sv = sv_newmortal(); */ |
1b1f1335 |
212 | sv_usepvn(sv, (char *) key, klen); |
213 | } |
19692e8d |
214 | if (flags & HVhek_UTF8) { |
1b1f1335 |
215 | SvUTF8_on(sv); |
216 | } |
c8cd6465 |
217 | Perl_croak(aTHX_ msg, sv); |
1b1f1335 |
218 | } |
219 | |
fde52b5c |
220 | /* (klen == HEf_SVKEY) is special for MAGICAL hv entries, meaning key slot |
221 | * contains an SV* */ |
222 | |
34a6f7b4 |
223 | #define HV_FETCH_ISSTORE 0x01 |
224 | #define HV_FETCH_ISEXISTS 0x02 |
225 | #define HV_FETCH_LVALUE 0x04 |
226 | #define HV_FETCH_JUST_SV 0x08 |
227 | |
228 | /* |
229 | =for apidoc hv_store |
230 | |
231 | Stores an SV in a hash. The hash key is specified as C<key> and C<klen> is |
232 | the length of the key. The C<hash> parameter is the precomputed hash |
233 | value; if it is zero then Perl will compute it. The return value will be |
234 | NULL if the operation failed or if the value did not need to be actually |
235 | stored within the hash (as in the case of tied hashes). Otherwise it can |
236 | be dereferenced to get the original C<SV*>. Note that the caller is |
237 | responsible for suitably incrementing the reference count of C<val> before |
238 | the call, and decrementing it if the function returned NULL. Effectively |
239 | a successful hv_store takes ownership of one reference to C<val>. This is |
240 | usually what you want; a newly created SV has a reference count of one, so |
241 | if all your code does is create SVs then store them in a hash, hv_store |
242 | will own the only reference to the new SV, and your code doesn't need to do |
243 | anything further to tidy up. hv_store is not implemented as a call to |
244 | hv_store_ent, and does not create a temporary SV for the key, so if your |
245 | key data is not already in SV form then use hv_store in preference to |
246 | hv_store_ent. |
247 | |
248 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
249 | information on how to use this function on tied hashes. |
250 | |
251 | =cut |
252 | */ |
253 | |
254 | SV** |
255 | Perl_hv_store(pTHX_ HV *hv, const char *key, I32 klen_i32, SV *val, U32 hash) |
256 | { |
257 | HE *hek; |
258 | STRLEN klen; |
259 | int flags; |
260 | |
261 | if (klen_i32 < 0) { |
262 | klen = -klen_i32; |
263 | flags = HVhek_UTF8; |
264 | } else { |
265 | klen = klen_i32; |
266 | flags = 0; |
267 | } |
268 | hek = hv_fetch_common (hv, NULL, key, klen, flags, |
52d01cc2 |
269 | (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), val, hash); |
34a6f7b4 |
270 | return hek ? &HeVAL(hek) : NULL; |
271 | } |
272 | |
fabdb6c0 |
273 | /* XXX This looks like an ideal candidate to inline */ |
34a6f7b4 |
274 | SV** |
275 | Perl_hv_store_flags(pTHX_ HV *hv, const char *key, I32 klen, SV *val, |
276 | register U32 hash, int flags) |
277 | { |
9d4ba2ae |
278 | HE * const hek = hv_fetch_common (hv, NULL, key, klen, flags, |
34a6f7b4 |
279 | (HV_FETCH_ISSTORE|HV_FETCH_JUST_SV), val, hash); |
280 | return hek ? &HeVAL(hek) : NULL; |
281 | } |
282 | |
283 | /* |
284 | =for apidoc hv_store_ent |
285 | |
286 | Stores C<val> in a hash. The hash key is specified as C<key>. The C<hash> |
287 | parameter is the precomputed hash value; if it is zero then Perl will |
288 | compute it. The return value is the new hash entry so created. It will be |
289 | NULL if the operation failed or if the value did not need to be actually |
290 | stored within the hash (as in the case of tied hashes). Otherwise the |
291 | contents of the return value can be accessed using the C<He?> macros |
292 | described here. Note that the caller is responsible for suitably |
293 | incrementing the reference count of C<val> before the call, and |
294 | decrementing it if the function returned NULL. Effectively a successful |
295 | hv_store_ent takes ownership of one reference to C<val>. This is |
296 | usually what you want; a newly created SV has a reference count of one, so |
297 | if all your code does is create SVs then store them in a hash, hv_store |
298 | will own the only reference to the new SV, and your code doesn't need to do |
299 | anything further to tidy up. Note that hv_store_ent only reads the C<key>; |
300 | unlike C<val> it does not take ownership of it, so maintaining the correct |
301 | reference count on C<key> is entirely the caller's responsibility. hv_store |
302 | is not implemented as a call to hv_store_ent, and does not create a temporary |
303 | SV for the key, so if your key data is not already in SV form then use |
304 | hv_store in preference to hv_store_ent. |
305 | |
306 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
307 | information on how to use this function on tied hashes. |
308 | |
309 | =cut |
310 | */ |
311 | |
fabdb6c0 |
312 | /* XXX This looks like an ideal candidate to inline */ |
34a6f7b4 |
313 | HE * |
314 | Perl_hv_store_ent(pTHX_ HV *hv, SV *keysv, SV *val, U32 hash) |
315 | { |
316 | return hv_fetch_common(hv, keysv, NULL, 0, 0, HV_FETCH_ISSTORE, val, hash); |
317 | } |
318 | |
319 | /* |
320 | =for apidoc hv_exists |
321 | |
322 | Returns a boolean indicating whether the specified hash key exists. The |
323 | C<klen> is the length of the key. |
324 | |
325 | =cut |
326 | */ |
327 | |
328 | bool |
329 | Perl_hv_exists(pTHX_ HV *hv, const char *key, I32 klen_i32) |
330 | { |
331 | STRLEN klen; |
332 | int flags; |
333 | |
334 | if (klen_i32 < 0) { |
335 | klen = -klen_i32; |
336 | flags = HVhek_UTF8; |
337 | } else { |
338 | klen = klen_i32; |
339 | flags = 0; |
340 | } |
341 | return hv_fetch_common(hv, NULL, key, klen, flags, HV_FETCH_ISEXISTS, 0, 0) |
342 | ? TRUE : FALSE; |
343 | } |
344 | |
954c1994 |
345 | /* |
346 | =for apidoc hv_fetch |
347 | |
348 | Returns the SV which corresponds to the specified key in the hash. The |
349 | C<klen> is the length of the key. If C<lval> is set then the fetch will be |
350 | part of a store. Check that the return value is non-null before |
d1be9408 |
351 | dereferencing it to an C<SV*>. |
954c1994 |
352 | |
96f1132b |
353 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
954c1994 |
354 | information on how to use this function on tied hashes. |
355 | |
356 | =cut |
357 | */ |
358 | |
79072805 |
359 | SV** |
c1fe5510 |
360 | Perl_hv_fetch(pTHX_ HV *hv, const char *key, I32 klen_i32, I32 lval) |
79072805 |
361 | { |
c1fe5510 |
362 | HE *hek; |
363 | STRLEN klen; |
364 | int flags; |
365 | |
366 | if (klen_i32 < 0) { |
367 | klen = -klen_i32; |
368 | flags = HVhek_UTF8; |
369 | } else { |
370 | klen = klen_i32; |
371 | flags = 0; |
372 | } |
373 | hek = hv_fetch_common (hv, NULL, key, klen, flags, |
c445ea15 |
374 | lval ? (HV_FETCH_JUST_SV | HV_FETCH_LVALUE) : HV_FETCH_JUST_SV, |
b2c64049 |
375 | Nullsv, 0); |
113738bb |
376 | return hek ? &HeVAL(hek) : NULL; |
79072805 |
377 | } |
378 | |
34a6f7b4 |
379 | /* |
380 | =for apidoc hv_exists_ent |
381 | |
382 | Returns a boolean indicating whether the specified hash key exists. C<hash> |
383 | can be a valid precomputed hash value, or 0 to ask for it to be |
384 | computed. |
385 | |
386 | =cut |
387 | */ |
388 | |
fabdb6c0 |
389 | /* XXX This looks like an ideal candidate to inline */ |
34a6f7b4 |
390 | bool |
391 | Perl_hv_exists_ent(pTHX_ HV *hv, SV *keysv, U32 hash) |
392 | { |
393 | return hv_fetch_common(hv, keysv, NULL, 0, 0, HV_FETCH_ISEXISTS, 0, hash) |
394 | ? TRUE : FALSE; |
395 | } |
396 | |
d1be9408 |
397 | /* returns an HE * structure with the all fields set */ |
fde52b5c |
398 | /* note that hent_val will be a mortal sv for MAGICAL hashes */ |
954c1994 |
399 | /* |
400 | =for apidoc hv_fetch_ent |
401 | |
402 | Returns the hash entry which corresponds to the specified key in the hash. |
403 | C<hash> must be a valid precomputed hash number for the given C<key>, or 0 |
404 | if you want the function to compute it. IF C<lval> is set then the fetch |
405 | will be part of a store. Make sure the return value is non-null before |
406 | accessing it. The return value when C<tb> is a tied hash is a pointer to a |
407 | static location, so be sure to make a copy of the structure if you need to |
1c846c1f |
408 | store it somewhere. |
954c1994 |
409 | |
96f1132b |
410 | See L<perlguts/"Understanding the Magic of Tied Hashes and Arrays"> for more |
954c1994 |
411 | information on how to use this function on tied hashes. |
412 | |
413 | =cut |
414 | */ |
415 | |
fde52b5c |
416 | HE * |
864dbfa3 |
417 | Perl_hv_fetch_ent(pTHX_ HV *hv, SV *keysv, I32 lval, register U32 hash) |
fde52b5c |
418 | { |
7f66fda2 |
419 | return hv_fetch_common(hv, keysv, NULL, 0, 0, |
b2c64049 |
420 | (lval ? HV_FETCH_LVALUE : 0), Nullsv, hash); |
113738bb |
421 | } |
422 | |
8f8d40ab |
423 | STATIC HE * |
c1fe5510 |
424 | S_hv_fetch_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen, |
b2c64049 |
425 | int flags, int action, SV *val, register U32 hash) |
113738bb |
426 | { |
27da23d5 |
427 | dVAR; |
b2c64049 |
428 | XPVHV* xhv; |
b2c64049 |
429 | HE *entry; |
430 | HE **oentry; |
fde52b5c |
431 | SV *sv; |
da58a35d |
432 | bool is_utf8; |
113738bb |
433 | int masked_flags; |
fde52b5c |
434 | |
435 | if (!hv) |
a4fc7abc |
436 | return NULL; |
fde52b5c |
437 | |
113738bb |
438 | if (keysv) { |
e593d2fe |
439 | if (flags & HVhek_FREEKEY) |
440 | Safefree(key); |
5c144d81 |
441 | key = SvPV_const(keysv, klen); |
c1fe5510 |
442 | flags = 0; |
113738bb |
443 | is_utf8 = (SvUTF8(keysv) != 0); |
444 | } else { |
c1fe5510 |
445 | is_utf8 = ((flags & HVhek_UTF8) ? TRUE : FALSE); |
113738bb |
446 | } |
113738bb |
447 | |
b2c64049 |
448 | xhv = (XPVHV*)SvANY(hv); |
7f66fda2 |
449 | if (SvMAGICAL(hv)) { |
6136c704 |
450 | if (SvRMAGICAL(hv) && !(action & (HV_FETCH_ISSTORE|HV_FETCH_ISEXISTS))) { |
7f66fda2 |
451 | if (mg_find((SV*)hv, PERL_MAGIC_tied) || SvGMAGICAL((SV*)hv)) { |
452 | sv = sv_newmortal(); |
113738bb |
453 | |
7f66fda2 |
454 | /* XXX should be able to skimp on the HE/HEK here when |
455 | HV_FETCH_JUST_SV is true. */ |
113738bb |
456 | |
7f66fda2 |
457 | if (!keysv) { |
458 | keysv = newSVpvn(key, klen); |
459 | if (is_utf8) { |
460 | SvUTF8_on(keysv); |
461 | } |
462 | } else { |
463 | keysv = newSVsv(keysv); |
113738bb |
464 | } |
7f66fda2 |
465 | mg_copy((SV*)hv, sv, (char *)keysv, HEf_SVKEY); |
466 | |
467 | /* grab a fake HE/HEK pair from the pool or make a new one */ |
468 | entry = PL_hv_fetch_ent_mh; |
469 | if (entry) |
470 | PL_hv_fetch_ent_mh = HeNEXT(entry); |
471 | else { |
472 | char *k; |
473 | entry = new_HE(); |
a02a5408 |
474 | Newx(k, HEK_BASESIZE + sizeof(SV*), char); |
7f66fda2 |
475 | HeKEY_hek(entry) = (HEK*)k; |
476 | } |
477 | HeNEXT(entry) = Nullhe; |
478 | HeSVKEY_set(entry, keysv); |
479 | HeVAL(entry) = sv; |
480 | sv_upgrade(sv, SVt_PVLV); |
481 | LvTYPE(sv) = 'T'; |
482 | /* so we can free entry when freeing sv */ |
483 | LvTARG(sv) = (SV*)entry; |
484 | |
485 | /* XXX remove at some point? */ |
486 | if (flags & HVhek_FREEKEY) |
487 | Safefree(key); |
488 | |
489 | return entry; |
113738bb |
490 | } |
7f66fda2 |
491 | #ifdef ENV_IS_CASELESS |
492 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
493 | U32 i; |
494 | for (i = 0; i < klen; ++i) |
495 | if (isLOWER(key[i])) { |
086cb327 |
496 | /* Would be nice if we had a routine to do the |
497 | copy and upercase in a single pass through. */ |
0bd48802 |
498 | const char * const nkey = strupr(savepvn(key,klen)); |
086cb327 |
499 | /* Note that this fetch is for nkey (the uppercased |
500 | key) whereas the store is for key (the original) */ |
501 | entry = hv_fetch_common(hv, Nullsv, nkey, klen, |
502 | HVhek_FREEKEY, /* free nkey */ |
503 | 0 /* non-LVAL fetch */, |
504 | Nullsv /* no value */, |
505 | 0 /* compute hash */); |
506 | if (!entry && (action & HV_FETCH_LVALUE)) { |
507 | /* This call will free key if necessary. |
508 | Do it this way to encourage compiler to tail |
509 | call optimise. */ |
510 | entry = hv_fetch_common(hv, keysv, key, klen, |
511 | flags, HV_FETCH_ISSTORE, |
512 | NEWSV(61,0), hash); |
513 | } else { |
514 | if (flags & HVhek_FREEKEY) |
515 | Safefree(key); |
516 | } |
517 | return entry; |
7f66fda2 |
518 | } |
902173a3 |
519 | } |
7f66fda2 |
520 | #endif |
521 | } /* ISFETCH */ |
522 | else if (SvRMAGICAL(hv) && (action & HV_FETCH_ISEXISTS)) { |
523 | if (mg_find((SV*)hv, PERL_MAGIC_tied) || SvGMAGICAL((SV*)hv)) { |
b2c64049 |
524 | /* I don't understand why hv_exists_ent has svret and sv, |
525 | whereas hv_exists only had one. */ |
9d4ba2ae |
526 | SV * const svret = sv_newmortal(); |
b2c64049 |
527 | sv = sv_newmortal(); |
7f66fda2 |
528 | |
529 | if (keysv || is_utf8) { |
530 | if (!keysv) { |
531 | keysv = newSVpvn(key, klen); |
532 | SvUTF8_on(keysv); |
533 | } else { |
534 | keysv = newSVsv(keysv); |
535 | } |
b2c64049 |
536 | mg_copy((SV*)hv, sv, (char *)sv_2mortal(keysv), HEf_SVKEY); |
537 | } else { |
538 | mg_copy((SV*)hv, sv, key, klen); |
7f66fda2 |
539 | } |
b2c64049 |
540 | if (flags & HVhek_FREEKEY) |
541 | Safefree(key); |
7f66fda2 |
542 | magic_existspack(svret, mg_find(sv, PERL_MAGIC_tiedelem)); |
543 | /* This cast somewhat evil, but I'm merely using NULL/ |
544 | not NULL to return the boolean exists. |
545 | And I know hv is not NULL. */ |
546 | return SvTRUE(svret) ? (HE *)hv : NULL; |
e7152ba2 |
547 | } |
7f66fda2 |
548 | #ifdef ENV_IS_CASELESS |
549 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
550 | /* XXX This code isn't UTF8 clean. */ |
a15d23f8 |
551 | char * const keysave = (char * const)key; |
b2c64049 |
552 | /* Will need to free this, so set FREEKEY flag. */ |
553 | key = savepvn(key,klen); |
554 | key = (const char*)strupr((char*)key); |
6136c704 |
555 | is_utf8 = FALSE; |
7f66fda2 |
556 | hash = 0; |
8b4f7dd5 |
557 | keysv = 0; |
b2c64049 |
558 | |
559 | if (flags & HVhek_FREEKEY) { |
560 | Safefree(keysave); |
561 | } |
562 | flags |= HVhek_FREEKEY; |
7f66fda2 |
563 | } |
902173a3 |
564 | #endif |
7f66fda2 |
565 | } /* ISEXISTS */ |
b2c64049 |
566 | else if (action & HV_FETCH_ISSTORE) { |
567 | bool needs_copy; |
568 | bool needs_store; |
569 | hv_magic_check (hv, &needs_copy, &needs_store); |
570 | if (needs_copy) { |
a3b680e6 |
571 | const bool save_taint = PL_tainted; |
b2c64049 |
572 | if (keysv || is_utf8) { |
573 | if (!keysv) { |
574 | keysv = newSVpvn(key, klen); |
575 | SvUTF8_on(keysv); |
576 | } |
577 | if (PL_tainting) |
578 | PL_tainted = SvTAINTED(keysv); |
579 | keysv = sv_2mortal(newSVsv(keysv)); |
580 | mg_copy((SV*)hv, val, (char*)keysv, HEf_SVKEY); |
581 | } else { |
582 | mg_copy((SV*)hv, val, key, klen); |
583 | } |
584 | |
585 | TAINT_IF(save_taint); |
7b2c381c |
586 | if (!HvARRAY(hv) && !needs_store) { |
b2c64049 |
587 | if (flags & HVhek_FREEKEY) |
588 | Safefree(key); |
589 | return Nullhe; |
590 | } |
591 | #ifdef ENV_IS_CASELESS |
592 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
593 | /* XXX This code isn't UTF8 clean. */ |
594 | const char *keysave = key; |
595 | /* Will need to free this, so set FREEKEY flag. */ |
596 | key = savepvn(key,klen); |
597 | key = (const char*)strupr((char*)key); |
6136c704 |
598 | is_utf8 = FALSE; |
b2c64049 |
599 | hash = 0; |
8b4f7dd5 |
600 | keysv = 0; |
b2c64049 |
601 | |
602 | if (flags & HVhek_FREEKEY) { |
603 | Safefree(keysave); |
604 | } |
605 | flags |= HVhek_FREEKEY; |
606 | } |
607 | #endif |
608 | } |
609 | } /* ISSTORE */ |
7f66fda2 |
610 | } /* SvMAGICAL */ |
fde52b5c |
611 | |
7b2c381c |
612 | if (!HvARRAY(hv)) { |
b2c64049 |
613 | if ((action & (HV_FETCH_LVALUE | HV_FETCH_ISSTORE)) |
fde52b5c |
614 | #ifdef DYNAMIC_ENV_FETCH /* if it's an %ENV lookup, we may get it on the fly */ |
8aacddc1 |
615 | || (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) |
fde52b5c |
616 | #endif |
d58e6666 |
617 | ) { |
618 | char *array; |
a02a5408 |
619 | Newxz(array, |
cbec9347 |
620 | PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */), |
d58e6666 |
621 | char); |
622 | HvARRAY(hv) = (HE**)array; |
623 | } |
7f66fda2 |
624 | #ifdef DYNAMIC_ENV_FETCH |
625 | else if (action & HV_FETCH_ISEXISTS) { |
626 | /* for an %ENV exists, if we do an insert it's by a recursive |
627 | store call, so avoid creating HvARRAY(hv) right now. */ |
628 | } |
629 | #endif |
113738bb |
630 | else { |
631 | /* XXX remove at some point? */ |
632 | if (flags & HVhek_FREEKEY) |
633 | Safefree(key); |
634 | |
fde52b5c |
635 | return 0; |
113738bb |
636 | } |
fde52b5c |
637 | } |
638 | |
19692e8d |
639 | if (is_utf8) { |
a15d23f8 |
640 | char * const keysave = (char * const)key; |
f9a63242 |
641 | key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8); |
19692e8d |
642 | if (is_utf8) |
c1fe5510 |
643 | flags |= HVhek_UTF8; |
644 | else |
645 | flags &= ~HVhek_UTF8; |
7f66fda2 |
646 | if (key != keysave) { |
647 | if (flags & HVhek_FREEKEY) |
648 | Safefree(keysave); |
19692e8d |
649 | flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
7f66fda2 |
650 | } |
19692e8d |
651 | } |
f9a63242 |
652 | |
4b5190b5 |
653 | if (HvREHASH(hv)) { |
654 | PERL_HASH_INTERNAL(hash, key, klen); |
b2c64049 |
655 | /* We don't have a pointer to the hv, so we have to replicate the |
656 | flag into every HEK, so that hv_iterkeysv can see it. */ |
657 | /* And yes, you do need this even though you are not "storing" because |
fdcd69b6 |
658 | you can flip the flags below if doing an lval lookup. (And that |
659 | was put in to give the semantics Andreas was expecting.) */ |
660 | flags |= HVhek_REHASH; |
4b5190b5 |
661 | } else if (!hash) { |
113738bb |
662 | if (keysv && (SvIsCOW_shared_hash(keysv))) { |
c158a4fd |
663 | hash = SvSHARED_HASH(keysv); |
46187eeb |
664 | } else { |
665 | PERL_HASH(hash, key, klen); |
666 | } |
667 | } |
effa1e2d |
668 | |
113738bb |
669 | masked_flags = (flags & HVhek_MASK); |
670 | |
7f66fda2 |
671 | #ifdef DYNAMIC_ENV_FETCH |
7b2c381c |
672 | if (!HvARRAY(hv)) entry = Null(HE*); |
7f66fda2 |
673 | else |
674 | #endif |
b2c64049 |
675 | { |
7b2c381c |
676 | entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)]; |
b2c64049 |
677 | } |
0298d7b9 |
678 | for (; entry; entry = HeNEXT(entry)) { |
fde52b5c |
679 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
680 | continue; |
eb160463 |
681 | if (HeKLEN(entry) != (I32)klen) |
fde52b5c |
682 | continue; |
1c846c1f |
683 | if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */ |
fde52b5c |
684 | continue; |
113738bb |
685 | if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8) |
c3654f1a |
686 | continue; |
b2c64049 |
687 | |
688 | if (action & (HV_FETCH_LVALUE|HV_FETCH_ISSTORE)) { |
689 | if (HeKFLAGS(entry) != masked_flags) { |
690 | /* We match if HVhek_UTF8 bit in our flags and hash key's |
691 | match. But if entry was set previously with HVhek_WASUTF8 |
692 | and key now doesn't (or vice versa) then we should change |
693 | the key's flag, as this is assignment. */ |
694 | if (HvSHAREKEYS(hv)) { |
695 | /* Need to swap the key we have for a key with the flags we |
696 | need. As keys are shared we can't just write to the |
697 | flag, so we share the new one, unshare the old one. */ |
6136c704 |
698 | HEK * const new_hek = share_hek_flags(key, klen, hash, |
6e838c70 |
699 | masked_flags); |
b2c64049 |
700 | unshare_hek (HeKEY_hek(entry)); |
701 | HeKEY_hek(entry) = new_hek; |
702 | } |
5d2b1485 |
703 | else if (hv == PL_strtab) { |
704 | /* PL_strtab is usually the only hash without HvSHAREKEYS, |
705 | so putting this test here is cheap */ |
706 | if (flags & HVhek_FREEKEY) |
707 | Safefree(key); |
708 | Perl_croak(aTHX_ S_strtab_error, |
709 | action & HV_FETCH_LVALUE ? "fetch" : "store"); |
710 | } |
b2c64049 |
711 | else |
712 | HeKFLAGS(entry) = masked_flags; |
713 | if (masked_flags & HVhek_ENABLEHVKFLAGS) |
714 | HvHASKFLAGS_on(hv); |
715 | } |
716 | if (HeVAL(entry) == &PL_sv_placeholder) { |
717 | /* yes, can store into placeholder slot */ |
718 | if (action & HV_FETCH_LVALUE) { |
719 | if (SvMAGICAL(hv)) { |
720 | /* This preserves behaviour with the old hv_fetch |
721 | implementation which at this point would bail out |
722 | with a break; (at "if we find a placeholder, we |
723 | pretend we haven't found anything") |
724 | |
725 | That break mean that if a placeholder were found, it |
726 | caused a call into hv_store, which in turn would |
727 | check magic, and if there is no magic end up pretty |
728 | much back at this point (in hv_store's code). */ |
729 | break; |
730 | } |
731 | /* LVAL fetch which actaully needs a store. */ |
732 | val = NEWSV(61,0); |
ca732855 |
733 | HvPLACEHOLDERS(hv)--; |
b2c64049 |
734 | } else { |
735 | /* store */ |
736 | if (val != &PL_sv_placeholder) |
ca732855 |
737 | HvPLACEHOLDERS(hv)--; |
b2c64049 |
738 | } |
739 | HeVAL(entry) = val; |
740 | } else if (action & HV_FETCH_ISSTORE) { |
741 | SvREFCNT_dec(HeVAL(entry)); |
742 | HeVAL(entry) = val; |
743 | } |
27bcc0a7 |
744 | } else if (HeVAL(entry) == &PL_sv_placeholder) { |
b2c64049 |
745 | /* if we find a placeholder, we pretend we haven't found |
746 | anything */ |
8aacddc1 |
747 | break; |
b2c64049 |
748 | } |
113738bb |
749 | if (flags & HVhek_FREEKEY) |
750 | Safefree(key); |
fde52b5c |
751 | return entry; |
752 | } |
753 | #ifdef DYNAMIC_ENV_FETCH /* %ENV lookup? If so, try to fetch the value now */ |
0ed29950 |
754 | if (!(action & HV_FETCH_ISSTORE) |
755 | && SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) { |
a6c40364 |
756 | unsigned long len; |
9d4ba2ae |
757 | const char * const env = PerlEnv_ENVgetenv_len(key,&len); |
a6c40364 |
758 | if (env) { |
759 | sv = newSVpvn(env,len); |
760 | SvTAINTED_on(sv); |
7fd3d16e |
761 | return hv_fetch_common(hv,keysv,key,klen,flags,HV_FETCH_ISSTORE,sv, |
b2c64049 |
762 | hash); |
a6c40364 |
763 | } |
fde52b5c |
764 | } |
765 | #endif |
7f66fda2 |
766 | |
767 | if (!entry && SvREADONLY(hv) && !(action & HV_FETCH_ISEXISTS)) { |
c445ea15 |
768 | hv_notallowed(flags, key, klen, |
c8cd6465 |
769 | "Attempt to access disallowed key '%"SVf"' in" |
770 | " a restricted hash"); |
1b1f1335 |
771 | } |
b2c64049 |
772 | if (!(action & (HV_FETCH_LVALUE|HV_FETCH_ISSTORE))) { |
773 | /* Not doing some form of store, so return failure. */ |
774 | if (flags & HVhek_FREEKEY) |
775 | Safefree(key); |
776 | return 0; |
777 | } |
113738bb |
778 | if (action & HV_FETCH_LVALUE) { |
b2c64049 |
779 | val = NEWSV(61,0); |
780 | if (SvMAGICAL(hv)) { |
781 | /* At this point the old hv_fetch code would call to hv_store, |
782 | which in turn might do some tied magic. So we need to make that |
783 | magic check happen. */ |
784 | /* gonna assign to this, so it better be there */ |
785 | return hv_fetch_common(hv, keysv, key, klen, flags, |
786 | HV_FETCH_ISSTORE, val, hash); |
787 | /* XXX Surely that could leak if the fetch-was-store fails? |
788 | Just like the hv_fetch. */ |
113738bb |
789 | } |
790 | } |
791 | |
b2c64049 |
792 | /* Welcome to hv_store... */ |
793 | |
7b2c381c |
794 | if (!HvARRAY(hv)) { |
b2c64049 |
795 | /* Not sure if we can get here. I think the only case of oentry being |
796 | NULL is for %ENV with dynamic env fetch. But that should disappear |
797 | with magic in the previous code. */ |
d58e6666 |
798 | char *array; |
a02a5408 |
799 | Newxz(array, |
b2c64049 |
800 | PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */), |
d58e6666 |
801 | char); |
802 | HvARRAY(hv) = (HE**)array; |
b2c64049 |
803 | } |
804 | |
7b2c381c |
805 | oentry = &(HvARRAY(hv))[hash & (I32) xhv->xhv_max]; |
ab4af705 |
806 | |
b2c64049 |
807 | entry = new_HE(); |
808 | /* share_hek_flags will do the free for us. This might be considered |
809 | bad API design. */ |
810 | if (HvSHAREKEYS(hv)) |
6e838c70 |
811 | HeKEY_hek(entry) = share_hek_flags(key, klen, hash, flags); |
5d2b1485 |
812 | else if (hv == PL_strtab) { |
813 | /* PL_strtab is usually the only hash without HvSHAREKEYS, so putting |
814 | this test here is cheap */ |
815 | if (flags & HVhek_FREEKEY) |
816 | Safefree(key); |
817 | Perl_croak(aTHX_ S_strtab_error, |
818 | action & HV_FETCH_LVALUE ? "fetch" : "store"); |
819 | } |
b2c64049 |
820 | else /* gotta do the real thing */ |
821 | HeKEY_hek(entry) = save_hek_flags(key, klen, hash, flags); |
822 | HeVAL(entry) = val; |
823 | HeNEXT(entry) = *oentry; |
824 | *oentry = entry; |
825 | |
826 | if (val == &PL_sv_placeholder) |
ca732855 |
827 | HvPLACEHOLDERS(hv)++; |
b2c64049 |
828 | if (masked_flags & HVhek_ENABLEHVKFLAGS) |
829 | HvHASKFLAGS_on(hv); |
830 | |
0298d7b9 |
831 | { |
832 | const HE *counter = HeNEXT(entry); |
833 | |
834 | xhv->xhv_keys++; /* HvKEYS(hv)++ */ |
835 | if (!counter) { /* initial entry? */ |
836 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
837 | } else if (xhv->xhv_keys > (IV)xhv->xhv_max) { |
838 | hsplit(hv); |
839 | } else if(!HvREHASH(hv)) { |
840 | U32 n_links = 1; |
841 | |
842 | while ((counter = HeNEXT(counter))) |
843 | n_links++; |
844 | |
845 | if (n_links > HV_MAX_LENGTH_BEFORE_SPLIT) { |
846 | /* Use only the old HvKEYS(hv) > HvMAX(hv) condition to limit |
847 | bucket splits on a rehashed hash, as we're not going to |
848 | split it again, and if someone is lucky (evil) enough to |
849 | get all the keys in one list they could exhaust our memory |
850 | as we repeatedly double the number of buckets on every |
851 | entry. Linear search feels a less worse thing to do. */ |
852 | hsplit(hv); |
853 | } |
854 | } |
fde52b5c |
855 | } |
b2c64049 |
856 | |
857 | return entry; |
fde52b5c |
858 | } |
859 | |
864dbfa3 |
860 | STATIC void |
cea2e8a9 |
861 | S_hv_magic_check(pTHX_ HV *hv, bool *needs_copy, bool *needs_store) |
d0066dc7 |
862 | { |
a3b680e6 |
863 | const MAGIC *mg = SvMAGIC(hv); |
d0066dc7 |
864 | *needs_copy = FALSE; |
865 | *needs_store = TRUE; |
866 | while (mg) { |
867 | if (isUPPER(mg->mg_type)) { |
868 | *needs_copy = TRUE; |
d60c5a05 |
869 | if (mg->mg_type == PERL_MAGIC_tied) { |
d0066dc7 |
870 | *needs_store = FALSE; |
4ab2a30b |
871 | return; /* We've set all there is to set. */ |
d0066dc7 |
872 | } |
873 | } |
874 | mg = mg->mg_moremagic; |
875 | } |
876 | } |
877 | |
954c1994 |
878 | /* |
a3bcc51e |
879 | =for apidoc hv_scalar |
880 | |
881 | Evaluates the hash in scalar context and returns the result. Handles magic when the hash is tied. |
882 | |
883 | =cut |
884 | */ |
885 | |
886 | SV * |
887 | Perl_hv_scalar(pTHX_ HV *hv) |
888 | { |
a3bcc51e |
889 | SV *sv; |
823a54a3 |
890 | |
891 | if (SvRMAGICAL(hv)) { |
892 | MAGIC * const mg = mg_find((SV*)hv, PERL_MAGIC_tied); |
893 | if (mg) |
894 | return magic_scalarpack(hv, mg); |
895 | } |
a3bcc51e |
896 | |
897 | sv = sv_newmortal(); |
898 | if (HvFILL((HV*)hv)) |
899 | Perl_sv_setpvf(aTHX_ sv, "%ld/%ld", |
900 | (long)HvFILL(hv), (long)HvMAX(hv) + 1); |
901 | else |
902 | sv_setiv(sv, 0); |
903 | |
904 | return sv; |
905 | } |
906 | |
907 | /* |
954c1994 |
908 | =for apidoc hv_delete |
909 | |
910 | Deletes a key/value pair in the hash. The value SV is removed from the |
1c846c1f |
911 | hash and returned to the caller. The C<klen> is the length of the key. |
954c1994 |
912 | The C<flags> value will normally be zero; if set to G_DISCARD then NULL |
913 | will be returned. |
914 | |
915 | =cut |
916 | */ |
917 | |
79072805 |
918 | SV * |
cd6d36ac |
919 | Perl_hv_delete(pTHX_ HV *hv, const char *key, I32 klen_i32, I32 flags) |
79072805 |
920 | { |
cd6d36ac |
921 | STRLEN klen; |
6136c704 |
922 | int k_flags; |
cd6d36ac |
923 | |
924 | if (klen_i32 < 0) { |
925 | klen = -klen_i32; |
6136c704 |
926 | k_flags = HVhek_UTF8; |
cd6d36ac |
927 | } else { |
928 | klen = klen_i32; |
6136c704 |
929 | k_flags = 0; |
cd6d36ac |
930 | } |
931 | return hv_delete_common(hv, NULL, key, klen, k_flags, flags, 0); |
fde52b5c |
932 | } |
933 | |
954c1994 |
934 | /* |
935 | =for apidoc hv_delete_ent |
936 | |
937 | Deletes a key/value pair in the hash. The value SV is removed from the |
938 | hash and returned to the caller. The C<flags> value will normally be zero; |
939 | if set to G_DISCARD then NULL will be returned. C<hash> can be a valid |
940 | precomputed hash value, or 0 to ask for it to be computed. |
941 | |
942 | =cut |
943 | */ |
944 | |
fabdb6c0 |
945 | /* XXX This looks like an ideal candidate to inline */ |
fde52b5c |
946 | SV * |
864dbfa3 |
947 | Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash) |
fde52b5c |
948 | { |
cd6d36ac |
949 | return hv_delete_common(hv, keysv, NULL, 0, 0, flags, hash); |
f1317c8d |
950 | } |
951 | |
8f8d40ab |
952 | STATIC SV * |
cd6d36ac |
953 | S_hv_delete_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen, |
954 | int k_flags, I32 d_flags, U32 hash) |
f1317c8d |
955 | { |
27da23d5 |
956 | dVAR; |
cbec9347 |
957 | register XPVHV* xhv; |
fde52b5c |
958 | register HE *entry; |
959 | register HE **oentry; |
9e720f71 |
960 | HE *const *first_entry; |
da58a35d |
961 | bool is_utf8; |
7a9669ca |
962 | int masked_flags; |
1c846c1f |
963 | |
fde52b5c |
964 | if (!hv) |
965 | return Nullsv; |
f1317c8d |
966 | |
967 | if (keysv) { |
e593d2fe |
968 | if (k_flags & HVhek_FREEKEY) |
969 | Safefree(key); |
5c144d81 |
970 | key = SvPV_const(keysv, klen); |
cd6d36ac |
971 | k_flags = 0; |
f1317c8d |
972 | is_utf8 = (SvUTF8(keysv) != 0); |
973 | } else { |
cd6d36ac |
974 | is_utf8 = ((k_flags & HVhek_UTF8) ? TRUE : FALSE); |
f1317c8d |
975 | } |
f1317c8d |
976 | |
fde52b5c |
977 | if (SvRMAGICAL(hv)) { |
0a0bb7c7 |
978 | bool needs_copy; |
979 | bool needs_store; |
980 | hv_magic_check (hv, &needs_copy, &needs_store); |
981 | |
f1317c8d |
982 | if (needs_copy) { |
6136c704 |
983 | SV *sv; |
7a9669ca |
984 | entry = hv_fetch_common(hv, keysv, key, klen, |
985 | k_flags & ~HVhek_FREEKEY, HV_FETCH_LVALUE, |
b2c64049 |
986 | Nullsv, hash); |
7a9669ca |
987 | sv = entry ? HeVAL(entry) : NULL; |
f1317c8d |
988 | if (sv) { |
989 | if (SvMAGICAL(sv)) { |
990 | mg_clear(sv); |
991 | } |
992 | if (!needs_store) { |
993 | if (mg_find(sv, PERL_MAGIC_tiedelem)) { |
994 | /* No longer an element */ |
995 | sv_unmagic(sv, PERL_MAGIC_tiedelem); |
996 | return sv; |
997 | } |
998 | return Nullsv; /* element cannot be deleted */ |
999 | } |
902173a3 |
1000 | #ifdef ENV_IS_CASELESS |
8167a60a |
1001 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
1002 | /* XXX This code isn't UTF8 clean. */ |
1003 | keysv = sv_2mortal(newSVpvn(key,klen)); |
1004 | if (k_flags & HVhek_FREEKEY) { |
1005 | Safefree(key); |
1006 | } |
1007 | key = strupr(SvPVX(keysv)); |
1008 | is_utf8 = 0; |
1009 | k_flags = 0; |
1010 | hash = 0; |
7f66fda2 |
1011 | } |
510ac311 |
1012 | #endif |
2fd1c6b8 |
1013 | } |
2fd1c6b8 |
1014 | } |
fde52b5c |
1015 | } |
cbec9347 |
1016 | xhv = (XPVHV*)SvANY(hv); |
7b2c381c |
1017 | if (!HvARRAY(hv)) |
fde52b5c |
1018 | return Nullsv; |
1019 | |
19692e8d |
1020 | if (is_utf8) { |
c445ea15 |
1021 | const char * const keysave = key; |
b464bac0 |
1022 | key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8); |
cd6d36ac |
1023 | |
19692e8d |
1024 | if (is_utf8) |
cd6d36ac |
1025 | k_flags |= HVhek_UTF8; |
1026 | else |
1027 | k_flags &= ~HVhek_UTF8; |
7f66fda2 |
1028 | if (key != keysave) { |
1029 | if (k_flags & HVhek_FREEKEY) { |
1030 | /* This shouldn't happen if our caller does what we expect, |
1031 | but strictly the API allows it. */ |
1032 | Safefree(keysave); |
1033 | } |
1034 | k_flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
1035 | } |
cd6d36ac |
1036 | HvHASKFLAGS_on((SV*)hv); |
19692e8d |
1037 | } |
f9a63242 |
1038 | |
4b5190b5 |
1039 | if (HvREHASH(hv)) { |
1040 | PERL_HASH_INTERNAL(hash, key, klen); |
1041 | } else if (!hash) { |
7a9669ca |
1042 | if (keysv && (SvIsCOW_shared_hash(keysv))) { |
c158a4fd |
1043 | hash = SvSHARED_HASH(keysv); |
7a9669ca |
1044 | } else { |
1045 | PERL_HASH(hash, key, klen); |
1046 | } |
4b5190b5 |
1047 | } |
fde52b5c |
1048 | |
7a9669ca |
1049 | masked_flags = (k_flags & HVhek_MASK); |
1050 | |
9e720f71 |
1051 | first_entry = oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; |
fde52b5c |
1052 | entry = *oentry; |
9e720f71 |
1053 | for (; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
6136c704 |
1054 | SV *sv; |
fde52b5c |
1055 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
1056 | continue; |
eb160463 |
1057 | if (HeKLEN(entry) != (I32)klen) |
fde52b5c |
1058 | continue; |
1c846c1f |
1059 | if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */ |
fde52b5c |
1060 | continue; |
7a9669ca |
1061 | if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8) |
c3654f1a |
1062 | continue; |
8aacddc1 |
1063 | |
5d2b1485 |
1064 | if (hv == PL_strtab) { |
1065 | if (k_flags & HVhek_FREEKEY) |
1066 | Safefree(key); |
1067 | Perl_croak(aTHX_ S_strtab_error, "delete"); |
1068 | } |
1069 | |
8aacddc1 |
1070 | /* if placeholder is here, it's already been deleted.... */ |
6136c704 |
1071 | if (HeVAL(entry) == &PL_sv_placeholder) { |
1072 | if (k_flags & HVhek_FREEKEY) |
1073 | Safefree(key); |
1074 | return NULL; |
8aacddc1 |
1075 | } |
6136c704 |
1076 | if (SvREADONLY(hv) && HeVAL(entry) && SvREADONLY(HeVAL(entry))) { |
2393f1b9 |
1077 | S_hv_notallowed(aTHX_ k_flags, key, klen, |
c8cd6465 |
1078 | "Attempt to delete readonly key '%"SVf"' from" |
1079 | " a restricted hash"); |
8aacddc1 |
1080 | } |
b84d0860 |
1081 | if (k_flags & HVhek_FREEKEY) |
1082 | Safefree(key); |
8aacddc1 |
1083 | |
cd6d36ac |
1084 | if (d_flags & G_DISCARD) |
fde52b5c |
1085 | sv = Nullsv; |
94f7643d |
1086 | else { |
79d01fbf |
1087 | sv = sv_2mortal(HeVAL(entry)); |
7996736c |
1088 | HeVAL(entry) = &PL_sv_placeholder; |
94f7643d |
1089 | } |
8aacddc1 |
1090 | |
1091 | /* |
1092 | * If a restricted hash, rather than really deleting the entry, put |
1093 | * a placeholder there. This marks the key as being "approved", so |
1094 | * we can still access via not-really-existing key without raising |
1095 | * an error. |
1096 | */ |
1097 | if (SvREADONLY(hv)) { |
754604c4 |
1098 | SvREFCNT_dec(HeVAL(entry)); |
7996736c |
1099 | HeVAL(entry) = &PL_sv_placeholder; |
8aacddc1 |
1100 | /* We'll be saving this slot, so the number of allocated keys |
1101 | * doesn't go down, but the number placeholders goes up */ |
ca732855 |
1102 | HvPLACEHOLDERS(hv)++; |
8aacddc1 |
1103 | } else { |
a26e96df |
1104 | *oentry = HeNEXT(entry); |
9e720f71 |
1105 | if(!*first_entry) { |
a26e96df |
1106 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
9e720f71 |
1107 | } |
b79f7545 |
1108 | if (SvOOK(hv) && entry == HvAUX(hv)->xhv_eiter /* HvEITER(hv) */) |
8aacddc1 |
1109 | HvLAZYDEL_on(hv); |
1110 | else |
1111 | hv_free_ent(hv, entry); |
1112 | xhv->xhv_keys--; /* HvKEYS(hv)-- */ |
574c8022 |
1113 | if (xhv->xhv_keys == 0) |
19692e8d |
1114 | HvHASKFLAGS_off(hv); |
8aacddc1 |
1115 | } |
79072805 |
1116 | return sv; |
1117 | } |
8aacddc1 |
1118 | if (SvREADONLY(hv)) { |
2393f1b9 |
1119 | S_hv_notallowed(aTHX_ k_flags, key, klen, |
c8cd6465 |
1120 | "Attempt to delete disallowed key '%"SVf"' from" |
1121 | " a restricted hash"); |
8aacddc1 |
1122 | } |
1123 | |
19692e8d |
1124 | if (k_flags & HVhek_FREEKEY) |
f9a63242 |
1125 | Safefree(key); |
79072805 |
1126 | return Nullsv; |
79072805 |
1127 | } |
1128 | |
76e3520e |
1129 | STATIC void |
cea2e8a9 |
1130 | S_hsplit(pTHX_ HV *hv) |
79072805 |
1131 | { |
97aff369 |
1132 | dVAR; |
cbec9347 |
1133 | register XPVHV* xhv = (XPVHV*)SvANY(hv); |
a3b680e6 |
1134 | const I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */ |
79072805 |
1135 | register I32 newsize = oldsize * 2; |
1136 | register I32 i; |
7b2c381c |
1137 | char *a = (char*) HvARRAY(hv); |
72311751 |
1138 | register HE **aep; |
79072805 |
1139 | register HE **oentry; |
4b5190b5 |
1140 | int longest_chain = 0; |
1141 | int was_shared; |
79072805 |
1142 | |
18026298 |
1143 | /*PerlIO_printf(PerlIO_stderr(), "hsplit called for %p which had %d\n", |
1144 | hv, (int) oldsize);*/ |
1145 | |
5d88ecd7 |
1146 | if (HvPLACEHOLDERS_get(hv) && !SvREADONLY(hv)) { |
18026298 |
1147 | /* Can make this clear any placeholders first for non-restricted hashes, |
1148 | even though Storable rebuilds restricted hashes by putting in all the |
1149 | placeholders (first) before turning on the readonly flag, because |
1150 | Storable always pre-splits the hash. */ |
1151 | hv_clear_placeholders(hv); |
1152 | } |
1153 | |
3280af22 |
1154 | PL_nomemok = TRUE; |
8d6dde3e |
1155 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
b79f7545 |
1156 | Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
1157 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
422a93e5 |
1158 | if (!a) { |
4a33f861 |
1159 | PL_nomemok = FALSE; |
422a93e5 |
1160 | return; |
1161 | } |
b79f7545 |
1162 | if (SvOOK(hv)) { |
7a9b70e9 |
1163 | Copy(&a[oldsize * sizeof(HE*)], &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
b79f7545 |
1164 | } |
4633a7c4 |
1165 | #else |
a02a5408 |
1166 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
b79f7545 |
1167 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
422a93e5 |
1168 | if (!a) { |
3280af22 |
1169 | PL_nomemok = FALSE; |
422a93e5 |
1170 | return; |
1171 | } |
7b2c381c |
1172 | Copy(HvARRAY(hv), a, oldsize * sizeof(HE*), char); |
b79f7545 |
1173 | if (SvOOK(hv)) { |
1174 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
1175 | } |
fba3b22e |
1176 | if (oldsize >= 64) { |
7b2c381c |
1177 | offer_nice_chunk(HvARRAY(hv), |
b79f7545 |
1178 | PERL_HV_ARRAY_ALLOC_BYTES(oldsize) |
1179 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0)); |
4633a7c4 |
1180 | } |
1181 | else |
7b2c381c |
1182 | Safefree(HvARRAY(hv)); |
4633a7c4 |
1183 | #endif |
1184 | |
3280af22 |
1185 | PL_nomemok = FALSE; |
72311751 |
1186 | Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/ |
cbec9347 |
1187 | xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */ |
7b2c381c |
1188 | HvARRAY(hv) = (HE**) a; |
72311751 |
1189 | aep = (HE**)a; |
79072805 |
1190 | |
72311751 |
1191 | for (i=0; i<oldsize; i++,aep++) { |
4b5190b5 |
1192 | int left_length = 0; |
1193 | int right_length = 0; |
a3b680e6 |
1194 | register HE *entry; |
1195 | register HE **bep; |
4b5190b5 |
1196 | |
72311751 |
1197 | if (!*aep) /* non-existent */ |
79072805 |
1198 | continue; |
72311751 |
1199 | bep = aep+oldsize; |
1200 | for (oentry = aep, entry = *aep; entry; entry = *oentry) { |
eb160463 |
1201 | if ((HeHASH(entry) & newsize) != (U32)i) { |
fde52b5c |
1202 | *oentry = HeNEXT(entry); |
72311751 |
1203 | HeNEXT(entry) = *bep; |
1204 | if (!*bep) |
cbec9347 |
1205 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
72311751 |
1206 | *bep = entry; |
4b5190b5 |
1207 | right_length++; |
79072805 |
1208 | continue; |
1209 | } |
4b5190b5 |
1210 | else { |
fde52b5c |
1211 | oentry = &HeNEXT(entry); |
4b5190b5 |
1212 | left_length++; |
1213 | } |
79072805 |
1214 | } |
72311751 |
1215 | if (!*aep) /* everything moved */ |
cbec9347 |
1216 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
4b5190b5 |
1217 | /* I think we don't actually need to keep track of the longest length, |
1218 | merely flag if anything is too long. But for the moment while |
1219 | developing this code I'll track it. */ |
1220 | if (left_length > longest_chain) |
1221 | longest_chain = left_length; |
1222 | if (right_length > longest_chain) |
1223 | longest_chain = right_length; |
1224 | } |
1225 | |
1226 | |
1227 | /* Pick your policy for "hashing isn't working" here: */ |
fdcd69b6 |
1228 | if (longest_chain <= HV_MAX_LENGTH_BEFORE_SPLIT /* split worked? */ |
4b5190b5 |
1229 | || HvREHASH(hv)) { |
1230 | return; |
79072805 |
1231 | } |
4b5190b5 |
1232 | |
1233 | if (hv == PL_strtab) { |
1234 | /* Urg. Someone is doing something nasty to the string table. |
1235 | Can't win. */ |
1236 | return; |
1237 | } |
1238 | |
1239 | /* Awooga. Awooga. Pathological data. */ |
fdcd69b6 |
1240 | /*PerlIO_printf(PerlIO_stderr(), "%p %d of %d with %d/%d buckets\n", hv, |
4b5190b5 |
1241 | longest_chain, HvTOTALKEYS(hv), HvFILL(hv), 1+HvMAX(hv));*/ |
1242 | |
1243 | ++newsize; |
a02a5408 |
1244 | Newxz(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
b79f7545 |
1245 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
1246 | if (SvOOK(hv)) { |
1247 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
1248 | } |
1249 | |
4b5190b5 |
1250 | was_shared = HvSHAREKEYS(hv); |
1251 | |
1252 | xhv->xhv_fill = 0; |
1253 | HvSHAREKEYS_off(hv); |
1254 | HvREHASH_on(hv); |
1255 | |
7b2c381c |
1256 | aep = HvARRAY(hv); |
4b5190b5 |
1257 | |
1258 | for (i=0; i<newsize; i++,aep++) { |
a3b680e6 |
1259 | register HE *entry = *aep; |
4b5190b5 |
1260 | while (entry) { |
1261 | /* We're going to trash this HE's next pointer when we chain it |
1262 | into the new hash below, so store where we go next. */ |
9d4ba2ae |
1263 | HE * const next = HeNEXT(entry); |
4b5190b5 |
1264 | UV hash; |
a3b680e6 |
1265 | HE **bep; |
4b5190b5 |
1266 | |
1267 | /* Rehash it */ |
1268 | PERL_HASH_INTERNAL(hash, HeKEY(entry), HeKLEN(entry)); |
1269 | |
1270 | if (was_shared) { |
1271 | /* Unshare it. */ |
aec46f14 |
1272 | HEK * const new_hek |
4b5190b5 |
1273 | = save_hek_flags(HeKEY(entry), HeKLEN(entry), |
1274 | hash, HeKFLAGS(entry)); |
1275 | unshare_hek (HeKEY_hek(entry)); |
1276 | HeKEY_hek(entry) = new_hek; |
1277 | } else { |
1278 | /* Not shared, so simply write the new hash in. */ |
1279 | HeHASH(entry) = hash; |
1280 | } |
1281 | /*PerlIO_printf(PerlIO_stderr(), "%d ", HeKFLAGS(entry));*/ |
1282 | HEK_REHASH_on(HeKEY_hek(entry)); |
1283 | /*PerlIO_printf(PerlIO_stderr(), "%d\n", HeKFLAGS(entry));*/ |
1284 | |
1285 | /* Copy oentry to the correct new chain. */ |
1286 | bep = ((HE**)a) + (hash & (I32) xhv->xhv_max); |
1287 | if (!*bep) |
1288 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
1289 | HeNEXT(entry) = *bep; |
1290 | *bep = entry; |
1291 | |
1292 | entry = next; |
1293 | } |
1294 | } |
7b2c381c |
1295 | Safefree (HvARRAY(hv)); |
1296 | HvARRAY(hv) = (HE **)a; |
79072805 |
1297 | } |
1298 | |
72940dca |
1299 | void |
864dbfa3 |
1300 | Perl_hv_ksplit(pTHX_ HV *hv, IV newmax) |
72940dca |
1301 | { |
97aff369 |
1302 | dVAR; |
cbec9347 |
1303 | register XPVHV* xhv = (XPVHV*)SvANY(hv); |
a3b680e6 |
1304 | const I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */ |
72940dca |
1305 | register I32 newsize; |
1306 | register I32 i; |
72311751 |
1307 | register char *a; |
1308 | register HE **aep; |
72940dca |
1309 | register HE *entry; |
1310 | register HE **oentry; |
1311 | |
1312 | newsize = (I32) newmax; /* possible truncation here */ |
1313 | if (newsize != newmax || newmax <= oldsize) |
1314 | return; |
1315 | while ((newsize & (1 + ~newsize)) != newsize) { |
1316 | newsize &= ~(newsize & (1 + ~newsize)); /* get proper power of 2 */ |
1317 | } |
1318 | if (newsize < newmax) |
1319 | newsize *= 2; |
1320 | if (newsize < newmax) |
1321 | return; /* overflow detection */ |
1322 | |
7b2c381c |
1323 | a = (char *) HvARRAY(hv); |
72940dca |
1324 | if (a) { |
3280af22 |
1325 | PL_nomemok = TRUE; |
8d6dde3e |
1326 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
b79f7545 |
1327 | Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
1328 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
8aacddc1 |
1329 | if (!a) { |
4a33f861 |
1330 | PL_nomemok = FALSE; |
422a93e5 |
1331 | return; |
1332 | } |
b79f7545 |
1333 | if (SvOOK(hv)) { |
7a9b70e9 |
1334 | Copy(&a[oldsize * sizeof(HE*)], &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
b79f7545 |
1335 | } |
72940dca |
1336 | #else |
a02a5408 |
1337 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
b79f7545 |
1338 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
8aacddc1 |
1339 | if (!a) { |
3280af22 |
1340 | PL_nomemok = FALSE; |
422a93e5 |
1341 | return; |
1342 | } |
7b2c381c |
1343 | Copy(HvARRAY(hv), a, oldsize * sizeof(HE*), char); |
b79f7545 |
1344 | if (SvOOK(hv)) { |
1345 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
1346 | } |
fba3b22e |
1347 | if (oldsize >= 64) { |
7b2c381c |
1348 | offer_nice_chunk(HvARRAY(hv), |
b79f7545 |
1349 | PERL_HV_ARRAY_ALLOC_BYTES(oldsize) |
1350 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0)); |
72940dca |
1351 | } |
1352 | else |
7b2c381c |
1353 | Safefree(HvARRAY(hv)); |
72940dca |
1354 | #endif |
3280af22 |
1355 | PL_nomemok = FALSE; |
72311751 |
1356 | Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/ |
72940dca |
1357 | } |
1358 | else { |
a02a5408 |
1359 | Newxz(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char); |
72940dca |
1360 | } |
cbec9347 |
1361 | xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */ |
7b2c381c |
1362 | HvARRAY(hv) = (HE **) a; |
cbec9347 |
1363 | if (!xhv->xhv_fill /* !HvFILL(hv) */) /* skip rest if no entries */ |
72940dca |
1364 | return; |
1365 | |
72311751 |
1366 | aep = (HE**)a; |
1367 | for (i=0; i<oldsize; i++,aep++) { |
1368 | if (!*aep) /* non-existent */ |
72940dca |
1369 | continue; |
72311751 |
1370 | for (oentry = aep, entry = *aep; entry; entry = *oentry) { |
6136c704 |
1371 | register I32 j = (HeHASH(entry) & newsize); |
1372 | |
1373 | if (j != i) { |
72940dca |
1374 | j -= i; |
1375 | *oentry = HeNEXT(entry); |
72311751 |
1376 | if (!(HeNEXT(entry) = aep[j])) |
cbec9347 |
1377 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
72311751 |
1378 | aep[j] = entry; |
72940dca |
1379 | continue; |
1380 | } |
1381 | else |
1382 | oentry = &HeNEXT(entry); |
1383 | } |
72311751 |
1384 | if (!*aep) /* everything moved */ |
cbec9347 |
1385 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
72940dca |
1386 | } |
1387 | } |
1388 | |
954c1994 |
1389 | /* |
1390 | =for apidoc newHV |
1391 | |
1392 | Creates a new HV. The reference count is set to 1. |
1393 | |
1394 | =cut |
1395 | */ |
1396 | |
79072805 |
1397 | HV * |
864dbfa3 |
1398 | Perl_newHV(pTHX) |
79072805 |
1399 | { |
cbec9347 |
1400 | register XPVHV* xhv; |
9d4ba2ae |
1401 | HV * const hv = (HV*)NEWSV(502,0); |
79072805 |
1402 | |
a0d0e21e |
1403 | sv_upgrade((SV *)hv, SVt_PVHV); |
cbec9347 |
1404 | xhv = (XPVHV*)SvANY(hv); |
79072805 |
1405 | SvPOK_off(hv); |
1406 | SvNOK_off(hv); |
1c846c1f |
1407 | #ifndef NODEFAULT_SHAREKEYS |
fde52b5c |
1408 | HvSHAREKEYS_on(hv); /* key-sharing on by default */ |
1c846c1f |
1409 | #endif |
4b5190b5 |
1410 | |
cbec9347 |
1411 | xhv->xhv_max = 7; /* HvMAX(hv) = 7 (start with 8 buckets) */ |
1412 | xhv->xhv_fill = 0; /* HvFILL(hv) = 0 */ |
79072805 |
1413 | return hv; |
1414 | } |
1415 | |
b3ac6de7 |
1416 | HV * |
864dbfa3 |
1417 | Perl_newHVhv(pTHX_ HV *ohv) |
b3ac6de7 |
1418 | { |
9d4ba2ae |
1419 | HV * const hv = newHV(); |
4beac62f |
1420 | STRLEN hv_max, hv_fill; |
4beac62f |
1421 | |
1422 | if (!ohv || (hv_fill = HvFILL(ohv)) == 0) |
1423 | return hv; |
4beac62f |
1424 | hv_max = HvMAX(ohv); |
b3ac6de7 |
1425 | |
b56ba0bf |
1426 | if (!SvMAGICAL((SV *)ohv)) { |
1427 | /* It's an ordinary hash, so copy it fast. AMS 20010804 */ |
eb160463 |
1428 | STRLEN i; |
a3b680e6 |
1429 | const bool shared = !!HvSHAREKEYS(ohv); |
aec46f14 |
1430 | HE **ents, ** const oents = (HE **)HvARRAY(ohv); |
ff875642 |
1431 | char *a; |
a02a5408 |
1432 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(hv_max+1), char); |
ff875642 |
1433 | ents = (HE**)a; |
b56ba0bf |
1434 | |
1435 | /* In each bucket... */ |
1436 | for (i = 0; i <= hv_max; i++) { |
6136c704 |
1437 | HE *prev = NULL; |
aec46f14 |
1438 | HE *oent = oents[i]; |
b56ba0bf |
1439 | |
1440 | if (!oent) { |
1441 | ents[i] = NULL; |
1442 | continue; |
1443 | } |
1444 | |
1445 | /* Copy the linked list of entries. */ |
aec46f14 |
1446 | for (; oent; oent = HeNEXT(oent)) { |
a3b680e6 |
1447 | const U32 hash = HeHASH(oent); |
1448 | const char * const key = HeKEY(oent); |
1449 | const STRLEN len = HeKLEN(oent); |
1450 | const int flags = HeKFLAGS(oent); |
6136c704 |
1451 | HE * const ent = new_HE(); |
b56ba0bf |
1452 | |
45dea987 |
1453 | HeVAL(ent) = newSVsv(HeVAL(oent)); |
19692e8d |
1454 | HeKEY_hek(ent) |
6e838c70 |
1455 | = shared ? share_hek_flags(key, len, hash, flags) |
19692e8d |
1456 | : save_hek_flags(key, len, hash, flags); |
b56ba0bf |
1457 | if (prev) |
1458 | HeNEXT(prev) = ent; |
1459 | else |
1460 | ents[i] = ent; |
1461 | prev = ent; |
1462 | HeNEXT(ent) = NULL; |
1463 | } |
1464 | } |
1465 | |
1466 | HvMAX(hv) = hv_max; |
1467 | HvFILL(hv) = hv_fill; |
8aacddc1 |
1468 | HvTOTALKEYS(hv) = HvTOTALKEYS(ohv); |
b56ba0bf |
1469 | HvARRAY(hv) = ents; |
aec46f14 |
1470 | } /* not magical */ |
b56ba0bf |
1471 | else { |
1472 | /* Iterate over ohv, copying keys and values one at a time. */ |
b3ac6de7 |
1473 | HE *entry; |
bfcb3514 |
1474 | const I32 riter = HvRITER_get(ohv); |
1475 | HE * const eiter = HvEITER_get(ohv); |
b56ba0bf |
1476 | |
1477 | /* Can we use fewer buckets? (hv_max is always 2^n-1) */ |
1478 | while (hv_max && hv_max + 1 >= hv_fill * 2) |
1479 | hv_max = hv_max / 2; |
1480 | HvMAX(hv) = hv_max; |
1481 | |
4a76a316 |
1482 | hv_iterinit(ohv); |
e16e2ff8 |
1483 | while ((entry = hv_iternext_flags(ohv, 0))) { |
19692e8d |
1484 | hv_store_flags(hv, HeKEY(entry), HeKLEN(entry), |
1485 | newSVsv(HeVAL(entry)), HeHASH(entry), |
1486 | HeKFLAGS(entry)); |
b3ac6de7 |
1487 | } |
bfcb3514 |
1488 | HvRITER_set(ohv, riter); |
1489 | HvEITER_set(ohv, eiter); |
b3ac6de7 |
1490 | } |
1c846c1f |
1491 | |
b3ac6de7 |
1492 | return hv; |
1493 | } |
1494 | |
79072805 |
1495 | void |
864dbfa3 |
1496 | Perl_hv_free_ent(pTHX_ HV *hv, register HE *entry) |
79072805 |
1497 | { |
97aff369 |
1498 | dVAR; |
16bdeea2 |
1499 | SV *val; |
1500 | |
68dc0745 |
1501 | if (!entry) |
79072805 |
1502 | return; |
16bdeea2 |
1503 | val = HeVAL(entry); |
bfcb3514 |
1504 | if (val && isGV(val) && GvCVu(val) && HvNAME_get(hv)) |
3280af22 |
1505 | PL_sub_generation++; /* may be deletion of method from stash */ |
16bdeea2 |
1506 | SvREFCNT_dec(val); |
68dc0745 |
1507 | if (HeKLEN(entry) == HEf_SVKEY) { |
1508 | SvREFCNT_dec(HeKEY_sv(entry)); |
8aacddc1 |
1509 | Safefree(HeKEY_hek(entry)); |
44a8e56a |
1510 | } |
1511 | else if (HvSHAREKEYS(hv)) |
68dc0745 |
1512 | unshare_hek(HeKEY_hek(entry)); |
fde52b5c |
1513 | else |
68dc0745 |
1514 | Safefree(HeKEY_hek(entry)); |
d33b2eba |
1515 | del_HE(entry); |
79072805 |
1516 | } |
1517 | |
1518 | void |
864dbfa3 |
1519 | Perl_hv_delayfree_ent(pTHX_ HV *hv, register HE *entry) |
79072805 |
1520 | { |
97aff369 |
1521 | dVAR; |
68dc0745 |
1522 | if (!entry) |
79072805 |
1523 | return; |
bc4947fc |
1524 | /* SvREFCNT_inc to counter the SvREFCNT_dec in hv_free_ent */ |
1525 | sv_2mortal(SvREFCNT_inc(HeVAL(entry))); /* free between statements */ |
68dc0745 |
1526 | if (HeKLEN(entry) == HEf_SVKEY) { |
bc4947fc |
1527 | sv_2mortal(SvREFCNT_inc(HeKEY_sv(entry))); |
44a8e56a |
1528 | } |
bc4947fc |
1529 | hv_free_ent(hv, entry); |
79072805 |
1530 | } |
1531 | |
954c1994 |
1532 | /* |
1533 | =for apidoc hv_clear |
1534 | |
1535 | Clears a hash, making it empty. |
1536 | |
1537 | =cut |
1538 | */ |
1539 | |
79072805 |
1540 | void |
864dbfa3 |
1541 | Perl_hv_clear(pTHX_ HV *hv) |
79072805 |
1542 | { |
27da23d5 |
1543 | dVAR; |
cbec9347 |
1544 | register XPVHV* xhv; |
79072805 |
1545 | if (!hv) |
1546 | return; |
49293501 |
1547 | |
ecae49c0 |
1548 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
1549 | |
34c3c4e3 |
1550 | xhv = (XPVHV*)SvANY(hv); |
1551 | |
7b2c381c |
1552 | if (SvREADONLY(hv) && HvARRAY(hv) != NULL) { |
34c3c4e3 |
1553 | /* restricted hash: convert all keys to placeholders */ |
b464bac0 |
1554 | STRLEN i; |
1555 | for (i = 0; i <= xhv->xhv_max; i++) { |
7b2c381c |
1556 | HE *entry = (HvARRAY(hv))[i]; |
3a676441 |
1557 | for (; entry; entry = HeNEXT(entry)) { |
1558 | /* not already placeholder */ |
7996736c |
1559 | if (HeVAL(entry) != &PL_sv_placeholder) { |
3a676441 |
1560 | if (HeVAL(entry) && SvREADONLY(HeVAL(entry))) { |
6136c704 |
1561 | SV* const keysv = hv_iterkeysv(entry); |
3a676441 |
1562 | Perl_croak(aTHX_ |
1563 | "Attempt to delete readonly key '%"SVf"' from a restricted hash", |
1564 | keysv); |
1565 | } |
1566 | SvREFCNT_dec(HeVAL(entry)); |
7996736c |
1567 | HeVAL(entry) = &PL_sv_placeholder; |
ca732855 |
1568 | HvPLACEHOLDERS(hv)++; |
3a676441 |
1569 | } |
34c3c4e3 |
1570 | } |
1571 | } |
df8c6964 |
1572 | goto reset; |
49293501 |
1573 | } |
1574 | |
463ee0b2 |
1575 | hfreeentries(hv); |
ca732855 |
1576 | HvPLACEHOLDERS_set(hv, 0); |
7b2c381c |
1577 | if (HvARRAY(hv)) |
1578 | (void)memzero(HvARRAY(hv), |
cbec9347 |
1579 | (xhv->xhv_max+1 /* HvMAX(hv)+1 */) * sizeof(HE*)); |
a0d0e21e |
1580 | |
1581 | if (SvRMAGICAL(hv)) |
1c846c1f |
1582 | mg_clear((SV*)hv); |
574c8022 |
1583 | |
19692e8d |
1584 | HvHASKFLAGS_off(hv); |
bb443f97 |
1585 | HvREHASH_off(hv); |
df8c6964 |
1586 | reset: |
b79f7545 |
1587 | if (SvOOK(hv)) { |
bfcb3514 |
1588 | HvEITER_set(hv, NULL); |
1589 | } |
79072805 |
1590 | } |
1591 | |
3540d4ce |
1592 | /* |
1593 | =for apidoc hv_clear_placeholders |
1594 | |
1595 | Clears any placeholders from a hash. If a restricted hash has any of its keys |
1596 | marked as readonly and the key is subsequently deleted, the key is not actually |
1597 | deleted but is marked by assigning it a value of &PL_sv_placeholder. This tags |
1598 | it so it will be ignored by future operations such as iterating over the hash, |
4cdaeff7 |
1599 | but will still allow the hash to have a value reassigned to the key at some |
3540d4ce |
1600 | future point. This function clears any such placeholder keys from the hash. |
1601 | See Hash::Util::lock_keys() for an example of its use. |
1602 | |
1603 | =cut |
1604 | */ |
1605 | |
1606 | void |
1607 | Perl_hv_clear_placeholders(pTHX_ HV *hv) |
1608 | { |
27da23d5 |
1609 | dVAR; |
5d88ecd7 |
1610 | I32 items = (I32)HvPLACEHOLDERS_get(hv); |
b464bac0 |
1611 | I32 i; |
d3677389 |
1612 | |
1613 | if (items == 0) |
1614 | return; |
1615 | |
b464bac0 |
1616 | i = HvMAX(hv); |
d3677389 |
1617 | do { |
1618 | /* Loop down the linked list heads */ |
6136c704 |
1619 | bool first = TRUE; |
d3677389 |
1620 | HE **oentry = &(HvARRAY(hv))[i]; |
cf6db12b |
1621 | HE *entry; |
d3677389 |
1622 | |
cf6db12b |
1623 | while ((entry = *oentry)) { |
d3677389 |
1624 | if (HeVAL(entry) == &PL_sv_placeholder) { |
1625 | *oentry = HeNEXT(entry); |
1626 | if (first && !*oentry) |
1627 | HvFILL(hv)--; /* This linked list is now empty. */ |
2e58978b |
1628 | if (entry == HvEITER_get(hv)) |
d3677389 |
1629 | HvLAZYDEL_on(hv); |
1630 | else |
1631 | hv_free_ent(hv, entry); |
1632 | |
1633 | if (--items == 0) { |
1634 | /* Finished. */ |
5d88ecd7 |
1635 | HvTOTALKEYS(hv) -= (IV)HvPLACEHOLDERS_get(hv); |
d3677389 |
1636 | if (HvKEYS(hv) == 0) |
1637 | HvHASKFLAGS_off(hv); |
5d88ecd7 |
1638 | HvPLACEHOLDERS_set(hv, 0); |
d3677389 |
1639 | return; |
1640 | } |
213ce8b3 |
1641 | } else { |
1642 | oentry = &HeNEXT(entry); |
6136c704 |
1643 | first = FALSE; |
d3677389 |
1644 | } |
1645 | } |
1646 | } while (--i >= 0); |
1647 | /* You can't get here, hence assertion should always fail. */ |
1648 | assert (items == 0); |
1649 | assert (0); |
3540d4ce |
1650 | } |
1651 | |
76e3520e |
1652 | STATIC void |
cea2e8a9 |
1653 | S_hfreeentries(pTHX_ HV *hv) |
79072805 |
1654 | { |
23976bdd |
1655 | /* This is the array that we're going to restore */ |
1656 | HE **orig_array; |
1657 | HEK *name; |
1658 | int attempts = 100; |
3abe233e |
1659 | |
a0d0e21e |
1660 | if (!HvARRAY(hv)) |
79072805 |
1661 | return; |
a0d0e21e |
1662 | |
23976bdd |
1663 | if (SvOOK(hv)) { |
1664 | /* If the hash is actually a symbol table with a name, look after the |
1665 | name. */ |
1666 | struct xpvhv_aux *iter = HvAUX(hv); |
1667 | |
1668 | name = iter->xhv_name; |
1669 | iter->xhv_name = NULL; |
1670 | } else { |
1671 | name = NULL; |
1672 | } |
1673 | |
1674 | orig_array = HvARRAY(hv); |
1675 | /* orig_array remains unchanged throughout the loop. If after freeing all |
1676 | the entries it turns out that one of the little blighters has triggered |
1677 | an action that has caused HvARRAY to be re-allocated, then we set |
1678 | array to the new HvARRAY, and try again. */ |
1679 | |
1680 | while (1) { |
1681 | /* This is the one we're going to try to empty. First time round |
1682 | it's the original array. (Hopefully there will only be 1 time |
1683 | round) */ |
6136c704 |
1684 | HE ** const array = HvARRAY(hv); |
7440661e |
1685 | I32 i = HvMAX(hv); |
23976bdd |
1686 | |
1687 | /* Because we have taken xhv_name out, the only allocated pointer |
1688 | in the aux structure that might exist is the backreference array. |
1689 | */ |
1690 | |
1691 | if (SvOOK(hv)) { |
7440661e |
1692 | HE *entry; |
23976bdd |
1693 | struct xpvhv_aux *iter = HvAUX(hv); |
1694 | /* If there are weak references to this HV, we need to avoid |
1695 | freeing them up here. In particular we need to keep the AV |
1696 | visible as what we're deleting might well have weak references |
1697 | back to this HV, so the for loop below may well trigger |
1698 | the removal of backreferences from this array. */ |
1699 | |
1700 | if (iter->xhv_backreferences) { |
1701 | /* So donate them to regular backref magic to keep them safe. |
1702 | The sv_magic will increase the reference count of the AV, |
1703 | so we need to drop it first. */ |
5b285ea4 |
1704 | SvREFCNT_dec(iter->xhv_backreferences); |
23976bdd |
1705 | if (AvFILLp(iter->xhv_backreferences) == -1) { |
1706 | /* Turns out that the array is empty. Just free it. */ |
1707 | SvREFCNT_dec(iter->xhv_backreferences); |
1b8791d1 |
1708 | |
23976bdd |
1709 | } else { |
1710 | sv_magic((SV*)hv, (SV*)iter->xhv_backreferences, |
1711 | PERL_MAGIC_backref, NULL, 0); |
1712 | } |
1713 | iter->xhv_backreferences = NULL; |
5b285ea4 |
1714 | } |
86f55936 |
1715 | |
23976bdd |
1716 | entry = iter->xhv_eiter; /* HvEITER(hv) */ |
1717 | if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
1718 | HvLAZYDEL_off(hv); |
1719 | hv_free_ent(hv, entry); |
1720 | } |
1721 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
1722 | iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */ |
b79f7545 |
1723 | |
23976bdd |
1724 | /* There are now no allocated pointers in the aux structure. */ |
2f86008e |
1725 | |
23976bdd |
1726 | SvFLAGS(hv) &= ~SVf_OOK; /* Goodbye, aux structure. */ |
1727 | /* What aux structure? */ |
a0d0e21e |
1728 | } |
bfcb3514 |
1729 | |
23976bdd |
1730 | /* make everyone else think the array is empty, so that the destructors |
1731 | * called for freed entries can't recusively mess with us */ |
1732 | HvARRAY(hv) = NULL; |
1733 | HvFILL(hv) = 0; |
1734 | ((XPVHV*) SvANY(hv))->xhv_keys = 0; |
1735 | |
7440661e |
1736 | |
1737 | do { |
1738 | /* Loop down the linked list heads */ |
1739 | HE *entry = array[i]; |
1740 | |
1741 | while (entry) { |
23976bdd |
1742 | register HE * const oentry = entry; |
1743 | entry = HeNEXT(entry); |
1744 | hv_free_ent(hv, oentry); |
1745 | } |
7440661e |
1746 | } while (--i >= 0); |
b79f7545 |
1747 | |
23976bdd |
1748 | /* As there are no allocated pointers in the aux structure, it's now |
1749 | safe to free the array we just cleaned up, if it's not the one we're |
1750 | going to put back. */ |
1751 | if (array != orig_array) { |
1752 | Safefree(array); |
1753 | } |
b79f7545 |
1754 | |
23976bdd |
1755 | if (!HvARRAY(hv)) { |
1756 | /* Good. No-one added anything this time round. */ |
1757 | break; |
bfcb3514 |
1758 | } |
b79f7545 |
1759 | |
23976bdd |
1760 | if (SvOOK(hv)) { |
1761 | /* Someone attempted to iterate or set the hash name while we had |
1762 | the array set to 0. We'll catch backferences on the next time |
1763 | round the while loop. */ |
1764 | assert(HvARRAY(hv)); |
1b8791d1 |
1765 | |
23976bdd |
1766 | if (HvAUX(hv)->xhv_name) { |
1767 | unshare_hek_or_pvn(HvAUX(hv)->xhv_name, 0, 0, 0); |
1768 | } |
1769 | } |
1770 | |
1771 | if (--attempts == 0) { |
1772 | Perl_die(aTHX_ "panic: hfreeentries failed to free hash - something is repeatedly re-creating entries"); |
1773 | } |
6136c704 |
1774 | } |
23976bdd |
1775 | |
1776 | HvARRAY(hv) = orig_array; |
1777 | |
1778 | /* If the hash was actually a symbol table, put the name back. */ |
1779 | if (name) { |
1780 | /* We have restored the original array. If name is non-NULL, then |
1781 | the original array had an aux structure at the end. So this is |
1782 | valid: */ |
1783 | SvFLAGS(hv) |= SVf_OOK; |
1784 | HvAUX(hv)->xhv_name = name; |
1b8791d1 |
1785 | } |
79072805 |
1786 | } |
1787 | |
954c1994 |
1788 | /* |
1789 | =for apidoc hv_undef |
1790 | |
1791 | Undefines the hash. |
1792 | |
1793 | =cut |
1794 | */ |
1795 | |
79072805 |
1796 | void |
864dbfa3 |
1797 | Perl_hv_undef(pTHX_ HV *hv) |
79072805 |
1798 | { |
97aff369 |
1799 | dVAR; |
cbec9347 |
1800 | register XPVHV* xhv; |
bfcb3514 |
1801 | const char *name; |
86f55936 |
1802 | |
79072805 |
1803 | if (!hv) |
1804 | return; |
ecae49c0 |
1805 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
cbec9347 |
1806 | xhv = (XPVHV*)SvANY(hv); |
463ee0b2 |
1807 | hfreeentries(hv); |
bfcb3514 |
1808 | if ((name = HvNAME_get(hv))) { |
7e8961ec |
1809 | if(PL_stashcache) |
7423f6db |
1810 | hv_delete(PL_stashcache, name, HvNAMELEN_get(hv), G_DISCARD); |
51a37f80 |
1811 | hv_name_set(hv, Nullch, 0, 0); |
85e6fe83 |
1812 | } |
b79f7545 |
1813 | SvFLAGS(hv) &= ~SVf_OOK; |
1814 | Safefree(HvARRAY(hv)); |
cbec9347 |
1815 | xhv->xhv_max = 7; /* HvMAX(hv) = 7 (it's a normal hash) */ |
7b2c381c |
1816 | HvARRAY(hv) = 0; |
ca732855 |
1817 | HvPLACEHOLDERS_set(hv, 0); |
a0d0e21e |
1818 | |
1819 | if (SvRMAGICAL(hv)) |
1c846c1f |
1820 | mg_clear((SV*)hv); |
79072805 |
1821 | } |
1822 | |
b464bac0 |
1823 | static struct xpvhv_aux* |
b79f7545 |
1824 | S_hv_auxinit(pTHX_ HV *hv) { |
bfcb3514 |
1825 | struct xpvhv_aux *iter; |
b79f7545 |
1826 | char *array; |
bfcb3514 |
1827 | |
b79f7545 |
1828 | if (!HvARRAY(hv)) { |
a02a5408 |
1829 | Newxz(array, PERL_HV_ARRAY_ALLOC_BYTES(HvMAX(hv) + 1) |
b79f7545 |
1830 | + sizeof(struct xpvhv_aux), char); |
1831 | } else { |
1832 | array = (char *) HvARRAY(hv); |
1833 | Renew(array, PERL_HV_ARRAY_ALLOC_BYTES(HvMAX(hv) + 1) |
1834 | + sizeof(struct xpvhv_aux), char); |
1835 | } |
1836 | HvARRAY(hv) = (HE**) array; |
1837 | /* SvOOK_on(hv) attacks the IV flags. */ |
1838 | SvFLAGS(hv) |= SVf_OOK; |
1839 | iter = HvAUX(hv); |
bfcb3514 |
1840 | |
1841 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
1842 | iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */ |
1843 | iter->xhv_name = 0; |
86f55936 |
1844 | iter->xhv_backreferences = 0; |
bfcb3514 |
1845 | return iter; |
1846 | } |
1847 | |
954c1994 |
1848 | /* |
1849 | =for apidoc hv_iterinit |
1850 | |
1851 | Prepares a starting point to traverse a hash table. Returns the number of |
1852 | keys in the hash (i.e. the same as C<HvKEYS(tb)>). The return value is |
1c846c1f |
1853 | currently only meaningful for hashes without tie magic. |
954c1994 |
1854 | |
1855 | NOTE: Before version 5.004_65, C<hv_iterinit> used to return the number of |
1856 | hash buckets that happen to be in use. If you still need that esoteric |
1857 | value, you can get it through the macro C<HvFILL(tb)>. |
1858 | |
e16e2ff8 |
1859 | |
954c1994 |
1860 | =cut |
1861 | */ |
1862 | |
79072805 |
1863 | I32 |
864dbfa3 |
1864 | Perl_hv_iterinit(pTHX_ HV *hv) |
79072805 |
1865 | { |
aa689395 |
1866 | if (!hv) |
cea2e8a9 |
1867 | Perl_croak(aTHX_ "Bad hash"); |
bfcb3514 |
1868 | |
b79f7545 |
1869 | if (SvOOK(hv)) { |
6136c704 |
1870 | struct xpvhv_aux * const iter = HvAUX(hv); |
0bd48802 |
1871 | HE * const entry = iter->xhv_eiter; /* HvEITER(hv) */ |
bfcb3514 |
1872 | if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
1873 | HvLAZYDEL_off(hv); |
1874 | hv_free_ent(hv, entry); |
1875 | } |
1876 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
1877 | iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */ |
1878 | } else { |
6136c704 |
1879 | hv_auxinit(hv); |
72940dca |
1880 | } |
bfcb3514 |
1881 | |
cbec9347 |
1882 | /* used to be xhv->xhv_fill before 5.004_65 */ |
5d88ecd7 |
1883 | return HvTOTALKEYS(hv); |
79072805 |
1884 | } |
bfcb3514 |
1885 | |
1886 | I32 * |
1887 | Perl_hv_riter_p(pTHX_ HV *hv) { |
1888 | struct xpvhv_aux *iter; |
1889 | |
1890 | if (!hv) |
1891 | Perl_croak(aTHX_ "Bad hash"); |
1892 | |
6136c704 |
1893 | iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
bfcb3514 |
1894 | return &(iter->xhv_riter); |
1895 | } |
1896 | |
1897 | HE ** |
1898 | Perl_hv_eiter_p(pTHX_ HV *hv) { |
1899 | struct xpvhv_aux *iter; |
1900 | |
1901 | if (!hv) |
1902 | Perl_croak(aTHX_ "Bad hash"); |
1903 | |
6136c704 |
1904 | iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
bfcb3514 |
1905 | return &(iter->xhv_eiter); |
1906 | } |
1907 | |
1908 | void |
1909 | Perl_hv_riter_set(pTHX_ HV *hv, I32 riter) { |
1910 | struct xpvhv_aux *iter; |
1911 | |
1912 | if (!hv) |
1913 | Perl_croak(aTHX_ "Bad hash"); |
1914 | |
b79f7545 |
1915 | if (SvOOK(hv)) { |
1916 | iter = HvAUX(hv); |
1917 | } else { |
bfcb3514 |
1918 | if (riter == -1) |
1919 | return; |
1920 | |
6136c704 |
1921 | iter = hv_auxinit(hv); |
bfcb3514 |
1922 | } |
1923 | iter->xhv_riter = riter; |
1924 | } |
1925 | |
1926 | void |
1927 | Perl_hv_eiter_set(pTHX_ HV *hv, HE *eiter) { |
1928 | struct xpvhv_aux *iter; |
1929 | |
1930 | if (!hv) |
1931 | Perl_croak(aTHX_ "Bad hash"); |
1932 | |
b79f7545 |
1933 | if (SvOOK(hv)) { |
1934 | iter = HvAUX(hv); |
1935 | } else { |
bfcb3514 |
1936 | /* 0 is the default so don't go malloc()ing a new structure just to |
1937 | hold 0. */ |
1938 | if (!eiter) |
1939 | return; |
1940 | |
6136c704 |
1941 | iter = hv_auxinit(hv); |
bfcb3514 |
1942 | } |
1943 | iter->xhv_eiter = eiter; |
1944 | } |
1945 | |
bfcb3514 |
1946 | void |
7423f6db |
1947 | Perl_hv_name_set(pTHX_ HV *hv, const char *name, I32 len, int flags) |
bfcb3514 |
1948 | { |
97aff369 |
1949 | dVAR; |
b79f7545 |
1950 | struct xpvhv_aux *iter; |
7423f6db |
1951 | U32 hash; |
46c461b5 |
1952 | |
1953 | PERL_UNUSED_ARG(flags); |
bfcb3514 |
1954 | |
b79f7545 |
1955 | if (SvOOK(hv)) { |
1956 | iter = HvAUX(hv); |
7423f6db |
1957 | if (iter->xhv_name) { |
1958 | unshare_hek_or_pvn(iter->xhv_name, 0, 0, 0); |
1959 | } |
16580ff5 |
1960 | } else { |
bfcb3514 |
1961 | if (name == 0) |
1962 | return; |
1963 | |
6136c704 |
1964 | iter = hv_auxinit(hv); |
bfcb3514 |
1965 | } |
7423f6db |
1966 | PERL_HASH(hash, name, len); |
1967 | iter->xhv_name = name ? share_hek(name, len, hash) : 0; |
bfcb3514 |
1968 | } |
1969 | |
86f55936 |
1970 | AV ** |
1971 | Perl_hv_backreferences_p(pTHX_ HV *hv) { |
6136c704 |
1972 | struct xpvhv_aux * const iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
86f55936 |
1973 | return &(iter->xhv_backreferences); |
1974 | } |
1975 | |
1976 | void |
1977 | Perl_hv_kill_backrefs(pTHX_ HV *hv) { |
1978 | AV *av; |
1979 | |
1980 | if (!SvOOK(hv)) |
1981 | return; |
1982 | |
1983 | av = HvAUX(hv)->xhv_backreferences; |
1984 | |
1985 | if (av) { |
1986 | HvAUX(hv)->xhv_backreferences = 0; |
1987 | Perl_sv_kill_backrefs(aTHX_ (SV*) hv, av); |
1988 | } |
1989 | } |
1990 | |
954c1994 |
1991 | /* |
7a7b9979 |
1992 | hv_iternext is implemented as a macro in hv.h |
1993 | |
954c1994 |
1994 | =for apidoc hv_iternext |
1995 | |
1996 | Returns entries from a hash iterator. See C<hv_iterinit>. |
1997 | |
fe7bca90 |
1998 | You may call C<hv_delete> or C<hv_delete_ent> on the hash entry that the |
1999 | iterator currently points to, without losing your place or invalidating your |
2000 | iterator. Note that in this case the current entry is deleted from the hash |
2001 | with your iterator holding the last reference to it. Your iterator is flagged |
2002 | to free the entry on the next call to C<hv_iternext>, so you must not discard |
2003 | your iterator immediately else the entry will leak - call C<hv_iternext> to |
2004 | trigger the resource deallocation. |
2005 | |
fe7bca90 |
2006 | =for apidoc hv_iternext_flags |
2007 | |
2008 | Returns entries from a hash iterator. See C<hv_iterinit> and C<hv_iternext>. |
2009 | The C<flags> value will normally be zero; if HV_ITERNEXT_WANTPLACEHOLDERS is |
2010 | set the placeholders keys (for restricted hashes) will be returned in addition |
2011 | to normal keys. By default placeholders are automatically skipped over. |
7996736c |
2012 | Currently a placeholder is implemented with a value that is |
2013 | C<&Perl_sv_placeholder>. Note that the implementation of placeholders and |
fe7bca90 |
2014 | restricted hashes may change, and the implementation currently is |
2015 | insufficiently abstracted for any change to be tidy. |
e16e2ff8 |
2016 | |
fe7bca90 |
2017 | =cut |
e16e2ff8 |
2018 | */ |
2019 | |
2020 | HE * |
2021 | Perl_hv_iternext_flags(pTHX_ HV *hv, I32 flags) |
2022 | { |
27da23d5 |
2023 | dVAR; |
cbec9347 |
2024 | register XPVHV* xhv; |
79072805 |
2025 | register HE *entry; |
a0d0e21e |
2026 | HE *oldentry; |
463ee0b2 |
2027 | MAGIC* mg; |
bfcb3514 |
2028 | struct xpvhv_aux *iter; |
79072805 |
2029 | |
2030 | if (!hv) |
cea2e8a9 |
2031 | Perl_croak(aTHX_ "Bad hash"); |
cbec9347 |
2032 | xhv = (XPVHV*)SvANY(hv); |
bfcb3514 |
2033 | |
b79f7545 |
2034 | if (!SvOOK(hv)) { |
bfcb3514 |
2035 | /* Too many things (well, pp_each at least) merrily assume that you can |
2036 | call iv_iternext without calling hv_iterinit, so we'll have to deal |
2037 | with it. */ |
2038 | hv_iterinit(hv); |
bfcb3514 |
2039 | } |
b79f7545 |
2040 | iter = HvAUX(hv); |
bfcb3514 |
2041 | |
2042 | oldentry = entry = iter->xhv_eiter; /* HvEITER(hv) */ |
463ee0b2 |
2043 | |
14befaf4 |
2044 | if ((mg = SvTIED_mg((SV*)hv, PERL_MAGIC_tied))) { |
c4420975 |
2045 | SV * const key = sv_newmortal(); |
cd1469e6 |
2046 | if (entry) { |
fde52b5c |
2047 | sv_setsv(key, HeSVKEY_force(entry)); |
cd1469e6 |
2048 | SvREFCNT_dec(HeSVKEY(entry)); /* get rid of previous key */ |
2049 | } |
a0d0e21e |
2050 | else { |
ff68c719 |
2051 | char *k; |
bbce6d69 |
2052 | HEK *hek; |
ff68c719 |
2053 | |
cbec9347 |
2054 | /* one HE per MAGICAL hash */ |
bfcb3514 |
2055 | iter->xhv_eiter = entry = new_HE(); /* HvEITER(hv) = new_HE() */ |
4633a7c4 |
2056 | Zero(entry, 1, HE); |
a02a5408 |
2057 | Newxz(k, HEK_BASESIZE + sizeof(SV*), char); |
ff68c719 |
2058 | hek = (HEK*)k; |
2059 | HeKEY_hek(entry) = hek; |
fde52b5c |
2060 | HeKLEN(entry) = HEf_SVKEY; |
a0d0e21e |
2061 | } |
2062 | magic_nextpack((SV*) hv,mg,key); |
8aacddc1 |
2063 | if (SvOK(key)) { |
cd1469e6 |
2064 | /* force key to stay around until next time */ |
bbce6d69 |
2065 | HeSVKEY_set(entry, SvREFCNT_inc(key)); |
2066 | return entry; /* beware, hent_val is not set */ |
8aacddc1 |
2067 | } |
fde52b5c |
2068 | if (HeVAL(entry)) |
2069 | SvREFCNT_dec(HeVAL(entry)); |
ff68c719 |
2070 | Safefree(HeKEY_hek(entry)); |
d33b2eba |
2071 | del_HE(entry); |
bfcb3514 |
2072 | iter->xhv_eiter = Null(HE*); /* HvEITER(hv) = Null(HE*) */ |
463ee0b2 |
2073 | return Null(HE*); |
79072805 |
2074 | } |
f675dbe5 |
2075 | #ifdef DYNAMIC_ENV_FETCH /* set up %ENV for iteration */ |
03026e68 |
2076 | if (!entry && SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) { |
f675dbe5 |
2077 | prime_env_iter(); |
03026e68 |
2078 | #ifdef VMS |
2079 | /* The prime_env_iter() on VMS just loaded up new hash values |
2080 | * so the iteration count needs to be reset back to the beginning |
2081 | */ |
2082 | hv_iterinit(hv); |
2083 | iter = HvAUX(hv); |
2084 | oldentry = entry = iter->xhv_eiter; /* HvEITER(hv) */ |
2085 | #endif |
2086 | } |
f675dbe5 |
2087 | #endif |
463ee0b2 |
2088 | |
b79f7545 |
2089 | /* hv_iterint now ensures this. */ |
2090 | assert (HvARRAY(hv)); |
2091 | |
015a5f36 |
2092 | /* At start of hash, entry is NULL. */ |
fde52b5c |
2093 | if (entry) |
8aacddc1 |
2094 | { |
fde52b5c |
2095 | entry = HeNEXT(entry); |
e16e2ff8 |
2096 | if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) { |
2097 | /* |
2098 | * Skip past any placeholders -- don't want to include them in |
2099 | * any iteration. |
2100 | */ |
7996736c |
2101 | while (entry && HeVAL(entry) == &PL_sv_placeholder) { |
e16e2ff8 |
2102 | entry = HeNEXT(entry); |
2103 | } |
8aacddc1 |
2104 | } |
2105 | } |
fde52b5c |
2106 | while (!entry) { |
015a5f36 |
2107 | /* OK. Come to the end of the current list. Grab the next one. */ |
2108 | |
bfcb3514 |
2109 | iter->xhv_riter++; /* HvRITER(hv)++ */ |
2110 | if (iter->xhv_riter > (I32)xhv->xhv_max /* HvRITER(hv) > HvMAX(hv) */) { |
015a5f36 |
2111 | /* There is no next one. End of the hash. */ |
bfcb3514 |
2112 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
fde52b5c |
2113 | break; |
79072805 |
2114 | } |
7b2c381c |
2115 | entry = (HvARRAY(hv))[iter->xhv_riter]; |
8aacddc1 |
2116 | |
e16e2ff8 |
2117 | if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) { |
015a5f36 |
2118 | /* If we have an entry, but it's a placeholder, don't count it. |
2119 | Try the next. */ |
7996736c |
2120 | while (entry && HeVAL(entry) == &PL_sv_placeholder) |
015a5f36 |
2121 | entry = HeNEXT(entry); |
2122 | } |
2123 | /* Will loop again if this linked list starts NULL |
2124 | (for HV_ITERNEXT_WANTPLACEHOLDERS) |
2125 | or if we run through it and find only placeholders. */ |
fde52b5c |
2126 | } |
79072805 |
2127 | |
72940dca |
2128 | if (oldentry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
2129 | HvLAZYDEL_off(hv); |
68dc0745 |
2130 | hv_free_ent(hv, oldentry); |
72940dca |
2131 | } |
a0d0e21e |
2132 | |
fdcd69b6 |
2133 | /*if (HvREHASH(hv) && entry && !HeKREHASH(entry)) |
2134 | PerlIO_printf(PerlIO_stderr(), "Awooga %p %p\n", hv, entry);*/ |
2135 | |
bfcb3514 |
2136 | iter->xhv_eiter = entry; /* HvEITER(hv) = entry */ |
79072805 |
2137 | return entry; |
2138 | } |
2139 | |
954c1994 |
2140 | /* |
2141 | =for apidoc hv_iterkey |
2142 | |
2143 | Returns the key from the current position of the hash iterator. See |
2144 | C<hv_iterinit>. |
2145 | |
2146 | =cut |
2147 | */ |
2148 | |
79072805 |
2149 | char * |
864dbfa3 |
2150 | Perl_hv_iterkey(pTHX_ register HE *entry, I32 *retlen) |
79072805 |
2151 | { |
fde52b5c |
2152 | if (HeKLEN(entry) == HEf_SVKEY) { |
fb73857a |
2153 | STRLEN len; |
0bd48802 |
2154 | char * const p = SvPV(HeKEY_sv(entry), len); |
fb73857a |
2155 | *retlen = len; |
2156 | return p; |
fde52b5c |
2157 | } |
2158 | else { |
2159 | *retlen = HeKLEN(entry); |
2160 | return HeKEY(entry); |
2161 | } |
2162 | } |
2163 | |
2164 | /* unlike hv_iterval(), this always returns a mortal copy of the key */ |
954c1994 |
2165 | /* |
2166 | =for apidoc hv_iterkeysv |
2167 | |
2168 | Returns the key as an C<SV*> from the current position of the hash |
2169 | iterator. The return value will always be a mortal copy of the key. Also |
2170 | see C<hv_iterinit>. |
2171 | |
2172 | =cut |
2173 | */ |
2174 | |
fde52b5c |
2175 | SV * |
864dbfa3 |
2176 | Perl_hv_iterkeysv(pTHX_ register HE *entry) |
fde52b5c |
2177 | { |
c1b02ed8 |
2178 | return sv_2mortal(newSVhek(HeKEY_hek(entry))); |
79072805 |
2179 | } |
2180 | |
954c1994 |
2181 | /* |
2182 | =for apidoc hv_iterval |
2183 | |
2184 | Returns the value from the current position of the hash iterator. See |
2185 | C<hv_iterkey>. |
2186 | |
2187 | =cut |
2188 | */ |
2189 | |
79072805 |
2190 | SV * |
864dbfa3 |
2191 | Perl_hv_iterval(pTHX_ HV *hv, register HE *entry) |
79072805 |
2192 | { |
8990e307 |
2193 | if (SvRMAGICAL(hv)) { |
14befaf4 |
2194 | if (mg_find((SV*)hv, PERL_MAGIC_tied)) { |
c4420975 |
2195 | SV* const sv = sv_newmortal(); |
bbce6d69 |
2196 | if (HeKLEN(entry) == HEf_SVKEY) |
2197 | mg_copy((SV*)hv, sv, (char*)HeKEY_sv(entry), HEf_SVKEY); |
a3b680e6 |
2198 | else |
2199 | mg_copy((SV*)hv, sv, HeKEY(entry), HeKLEN(entry)); |
463ee0b2 |
2200 | return sv; |
2201 | } |
79072805 |
2202 | } |
fde52b5c |
2203 | return HeVAL(entry); |
79072805 |
2204 | } |
2205 | |
954c1994 |
2206 | /* |
2207 | =for apidoc hv_iternextsv |
2208 | |
2209 | Performs an C<hv_iternext>, C<hv_iterkey>, and C<hv_iterval> in one |
2210 | operation. |
2211 | |
2212 | =cut |
2213 | */ |
2214 | |
a0d0e21e |
2215 | SV * |
864dbfa3 |
2216 | Perl_hv_iternextsv(pTHX_ HV *hv, char **key, I32 *retlen) |
a0d0e21e |
2217 | { |
0bd48802 |
2218 | HE * const he = hv_iternext_flags(hv, 0); |
2219 | |
2220 | if (!he) |
a0d0e21e |
2221 | return NULL; |
2222 | *key = hv_iterkey(he, retlen); |
2223 | return hv_iterval(hv, he); |
2224 | } |
2225 | |
954c1994 |
2226 | /* |
bc5cdc23 |
2227 | |
2228 | Now a macro in hv.h |
2229 | |
954c1994 |
2230 | =for apidoc hv_magic |
2231 | |
2232 | Adds magic to a hash. See C<sv_magic>. |
2233 | |
2234 | =cut |
2235 | */ |
2236 | |
bbce6d69 |
2237 | /* possibly free a shared string if no one has access to it |
fde52b5c |
2238 | * len and hash must both be valid for str. |
2239 | */ |
bbce6d69 |
2240 | void |
864dbfa3 |
2241 | Perl_unsharepvn(pTHX_ const char *str, I32 len, U32 hash) |
fde52b5c |
2242 | { |
19692e8d |
2243 | unshare_hek_or_pvn (NULL, str, len, hash); |
2244 | } |
2245 | |
2246 | |
2247 | void |
2248 | Perl_unshare_hek(pTHX_ HEK *hek) |
2249 | { |
2250 | unshare_hek_or_pvn(hek, NULL, 0, 0); |
2251 | } |
2252 | |
2253 | /* possibly free a shared string if no one has access to it |
2254 | hek if non-NULL takes priority over the other 3, else str, len and hash |
2255 | are used. If so, len and hash must both be valid for str. |
2256 | */ |
df132699 |
2257 | STATIC void |
97ddebaf |
2258 | S_unshare_hek_or_pvn(pTHX_ const HEK *hek, const char *str, I32 len, U32 hash) |
19692e8d |
2259 | { |
97aff369 |
2260 | dVAR; |
cbec9347 |
2261 | register XPVHV* xhv; |
20454177 |
2262 | HE *entry; |
fde52b5c |
2263 | register HE **oentry; |
45d1cc86 |
2264 | HE **first; |
a3b680e6 |
2265 | bool found = 0; |
c3654f1a |
2266 | bool is_utf8 = FALSE; |
19692e8d |
2267 | int k_flags = 0; |
aec46f14 |
2268 | const char * const save = str; |
cbbf8932 |
2269 | struct shared_he *he = NULL; |
c3654f1a |
2270 | |
19692e8d |
2271 | if (hek) { |
cbae3960 |
2272 | /* Find the shared he which is just before us in memory. */ |
2273 | he = (struct shared_he *)(((char *)hek) |
2274 | - STRUCT_OFFSET(struct shared_he, |
2275 | shared_he_hek)); |
2276 | |
2277 | /* Assert that the caller passed us a genuine (or at least consistent) |
2278 | shared hek */ |
2279 | assert (he->shared_he_he.hent_hek == hek); |
29404ae0 |
2280 | |
2281 | LOCK_STRTAB_MUTEX; |
2282 | if (he->shared_he_he.hent_val - 1) { |
2283 | --he->shared_he_he.hent_val; |
2284 | UNLOCK_STRTAB_MUTEX; |
2285 | return; |
2286 | } |
2287 | UNLOCK_STRTAB_MUTEX; |
2288 | |
19692e8d |
2289 | hash = HEK_HASH(hek); |
2290 | } else if (len < 0) { |
2291 | STRLEN tmplen = -len; |
2292 | is_utf8 = TRUE; |
2293 | /* See the note in hv_fetch(). --jhi */ |
2294 | str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8); |
2295 | len = tmplen; |
2296 | if (is_utf8) |
2297 | k_flags = HVhek_UTF8; |
2298 | if (str != save) |
2299 | k_flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
c3654f1a |
2300 | } |
1c846c1f |
2301 | |
fde52b5c |
2302 | /* what follows is the moral equivalent of: |
6b88bc9c |
2303 | if ((Svp = hv_fetch(PL_strtab, tmpsv, FALSE, hash))) { |
bbce6d69 |
2304 | if (--*Svp == Nullsv) |
6b88bc9c |
2305 | hv_delete(PL_strtab, str, len, G_DISCARD, hash); |
bbce6d69 |
2306 | } */ |
cbec9347 |
2307 | xhv = (XPVHV*)SvANY(PL_strtab); |
fde52b5c |
2308 | /* assert(xhv_array != 0) */ |
5f08fbcd |
2309 | LOCK_STRTAB_MUTEX; |
45d1cc86 |
2310 | first = oentry = &(HvARRAY(PL_strtab))[hash & (I32) HvMAX(PL_strtab)]; |
6c1b96a1 |
2311 | if (he) { |
2312 | const HE *const he_he = &(he->shared_he_he); |
45d1cc86 |
2313 | for (entry = *oentry; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
6c1b96a1 |
2314 | if (entry != he_he) |
19692e8d |
2315 | continue; |
2316 | found = 1; |
2317 | break; |
2318 | } |
2319 | } else { |
35a4481c |
2320 | const int flags_masked = k_flags & HVhek_MASK; |
45d1cc86 |
2321 | for (entry = *oentry; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
19692e8d |
2322 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
2323 | continue; |
2324 | if (HeKLEN(entry) != len) |
2325 | continue; |
2326 | if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */ |
2327 | continue; |
2328 | if (HeKFLAGS(entry) != flags_masked) |
2329 | continue; |
2330 | found = 1; |
2331 | break; |
2332 | } |
2333 | } |
2334 | |
2335 | if (found) { |
2336 | if (--HeVAL(entry) == Nullsv) { |
2337 | *oentry = HeNEXT(entry); |
45d1cc86 |
2338 | if (!*first) { |
2339 | /* There are now no entries in our slot. */ |
19692e8d |
2340 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
45d1cc86 |
2341 | } |
cbae3960 |
2342 | Safefree(entry); |
19692e8d |
2343 | xhv->xhv_keys--; /* HvKEYS(hv)-- */ |
2344 | } |
fde52b5c |
2345 | } |
19692e8d |
2346 | |
333f433b |
2347 | UNLOCK_STRTAB_MUTEX; |
411caa50 |
2348 | if (!found && ckWARN_d(WARN_INTERNAL)) |
19692e8d |
2349 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
472d47bc |
2350 | "Attempt to free non-existent shared string '%s'%s" |
2351 | pTHX__FORMAT, |
19692e8d |
2352 | hek ? HEK_KEY(hek) : str, |
472d47bc |
2353 | ((k_flags & HVhek_UTF8) ? " (utf8)" : "") pTHX__VALUE); |
19692e8d |
2354 | if (k_flags & HVhek_FREEKEY) |
2355 | Safefree(str); |
fde52b5c |
2356 | } |
2357 | |
bbce6d69 |
2358 | /* get a (constant) string ptr from the global string table |
2359 | * string will get added if it is not already there. |
fde52b5c |
2360 | * len and hash must both be valid for str. |
2361 | */ |
bbce6d69 |
2362 | HEK * |
864dbfa3 |
2363 | Perl_share_hek(pTHX_ const char *str, I32 len, register U32 hash) |
fde52b5c |
2364 | { |
da58a35d |
2365 | bool is_utf8 = FALSE; |
19692e8d |
2366 | int flags = 0; |
aec46f14 |
2367 | const char * const save = str; |
da58a35d |
2368 | |
2369 | if (len < 0) { |
77caf834 |
2370 | STRLEN tmplen = -len; |
da58a35d |
2371 | is_utf8 = TRUE; |
77caf834 |
2372 | /* See the note in hv_fetch(). --jhi */ |
2373 | str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8); |
2374 | len = tmplen; |
19692e8d |
2375 | /* If we were able to downgrade here, then than means that we were passed |
2376 | in a key which only had chars 0-255, but was utf8 encoded. */ |
2377 | if (is_utf8) |
2378 | flags = HVhek_UTF8; |
2379 | /* If we found we were able to downgrade the string to bytes, then |
2380 | we should flag that it needs upgrading on keys or each. Also flag |
2381 | that we need share_hek_flags to free the string. */ |
2382 | if (str != save) |
2383 | flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
2384 | } |
2385 | |
6e838c70 |
2386 | return share_hek_flags (str, len, hash, flags); |
19692e8d |
2387 | } |
2388 | |
6e838c70 |
2389 | STATIC HEK * |
19692e8d |
2390 | S_share_hek_flags(pTHX_ const char *str, I32 len, register U32 hash, int flags) |
2391 | { |
97aff369 |
2392 | dVAR; |
19692e8d |
2393 | register HE *entry; |
35a4481c |
2394 | const int flags_masked = flags & HVhek_MASK; |
263cb4a6 |
2395 | const U32 hindex = hash & (I32) HvMAX(PL_strtab); |
bbce6d69 |
2396 | |
fde52b5c |
2397 | /* what follows is the moral equivalent of: |
1c846c1f |
2398 | |
6b88bc9c |
2399 | if (!(Svp = hv_fetch(PL_strtab, str, len, FALSE))) |
8aacddc1 |
2400 | hv_store(PL_strtab, str, len, Nullsv, hash); |
fdcd69b6 |
2401 | |
2402 | Can't rehash the shared string table, so not sure if it's worth |
2403 | counting the number of entries in the linked list |
bbce6d69 |
2404 | */ |
1b6737cc |
2405 | register XPVHV * const xhv = (XPVHV*)SvANY(PL_strtab); |
fde52b5c |
2406 | /* assert(xhv_array != 0) */ |
5f08fbcd |
2407 | LOCK_STRTAB_MUTEX; |
263cb4a6 |
2408 | entry = (HvARRAY(PL_strtab))[hindex]; |
2409 | for (;entry; entry = HeNEXT(entry)) { |
fde52b5c |
2410 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
2411 | continue; |
2412 | if (HeKLEN(entry) != len) |
2413 | continue; |
1c846c1f |
2414 | if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */ |
fde52b5c |
2415 | continue; |
19692e8d |
2416 | if (HeKFLAGS(entry) != flags_masked) |
c3654f1a |
2417 | continue; |
fde52b5c |
2418 | break; |
2419 | } |
263cb4a6 |
2420 | |
2421 | if (!entry) { |
45d1cc86 |
2422 | /* What used to be head of the list. |
2423 | If this is NULL, then we're the first entry for this slot, which |
2424 | means we need to increate fill. */ |
cbae3960 |
2425 | struct shared_he *new_entry; |
2426 | HEK *hek; |
2427 | char *k; |
263cb4a6 |
2428 | HE **const head = &HvARRAY(PL_strtab)[hindex]; |
2429 | HE *const next = *head; |
cbae3960 |
2430 | |
2431 | /* We don't actually store a HE from the arena and a regular HEK. |
2432 | Instead we allocate one chunk of memory big enough for both, |
2433 | and put the HEK straight after the HE. This way we can find the |
2434 | HEK directly from the HE. |
2435 | */ |
2436 | |
a02a5408 |
2437 | Newx(k, STRUCT_OFFSET(struct shared_he, |
cbae3960 |
2438 | shared_he_hek.hek_key[0]) + len + 2, char); |
2439 | new_entry = (struct shared_he *)k; |
2440 | entry = &(new_entry->shared_he_he); |
2441 | hek = &(new_entry->shared_he_hek); |
2442 | |
2443 | Copy(str, HEK_KEY(hek), len, char); |
2444 | HEK_KEY(hek)[len] = 0; |
2445 | HEK_LEN(hek) = len; |
2446 | HEK_HASH(hek) = hash; |
2447 | HEK_FLAGS(hek) = (unsigned char)flags_masked; |
2448 | |
2449 | /* Still "point" to the HEK, so that other code need not know what |
2450 | we're up to. */ |
2451 | HeKEY_hek(entry) = hek; |
bbce6d69 |
2452 | HeVAL(entry) = Nullsv; |
263cb4a6 |
2453 | HeNEXT(entry) = next; |
2454 | *head = entry; |
cbae3960 |
2455 | |
cbec9347 |
2456 | xhv->xhv_keys++; /* HvKEYS(hv)++ */ |
263cb4a6 |
2457 | if (!next) { /* initial entry? */ |
cbec9347 |
2458 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
4c9cc595 |
2459 | } else if (xhv->xhv_keys > (IV)xhv->xhv_max /* HvKEYS(hv) > HvMAX(hv) */) { |
cbec9347 |
2460 | hsplit(PL_strtab); |
bbce6d69 |
2461 | } |
2462 | } |
2463 | |
2464 | ++HeVAL(entry); /* use value slot as REFCNT */ |
5f08fbcd |
2465 | UNLOCK_STRTAB_MUTEX; |
19692e8d |
2466 | |
2467 | if (flags & HVhek_FREEKEY) |
f9a63242 |
2468 | Safefree(str); |
19692e8d |
2469 | |
6e838c70 |
2470 | return HeKEY_hek(entry); |
fde52b5c |
2471 | } |
ecae49c0 |
2472 | |
ca732855 |
2473 | I32 * |
2474 | Perl_hv_placeholders_p(pTHX_ HV *hv) |
2475 | { |
2476 | dVAR; |
2477 | MAGIC *mg = mg_find((SV*)hv, PERL_MAGIC_rhash); |
2478 | |
2479 | if (!mg) { |
2480 | mg = sv_magicext((SV*)hv, 0, PERL_MAGIC_rhash, 0, 0, 0); |
2481 | |
2482 | if (!mg) { |
2483 | Perl_die(aTHX_ "panic: hv_placeholders_p"); |
2484 | } |
2485 | } |
2486 | return &(mg->mg_len); |
2487 | } |
2488 | |
2489 | |
2490 | I32 |
2491 | Perl_hv_placeholders_get(pTHX_ HV *hv) |
2492 | { |
2493 | dVAR; |
b464bac0 |
2494 | MAGIC * const mg = mg_find((SV*)hv, PERL_MAGIC_rhash); |
ca732855 |
2495 | |
2496 | return mg ? mg->mg_len : 0; |
2497 | } |
2498 | |
2499 | void |
ac1e784a |
2500 | Perl_hv_placeholders_set(pTHX_ HV *hv, I32 ph) |
ca732855 |
2501 | { |
2502 | dVAR; |
b464bac0 |
2503 | MAGIC * const mg = mg_find((SV*)hv, PERL_MAGIC_rhash); |
ca732855 |
2504 | |
2505 | if (mg) { |
2506 | mg->mg_len = ph; |
2507 | } else if (ph) { |
2508 | if (!sv_magicext((SV*)hv, 0, PERL_MAGIC_rhash, 0, 0, ph)) |
2509 | Perl_die(aTHX_ "panic: hv_placeholders_set"); |
2510 | } |
2511 | /* else we don't need to add magic to record 0 placeholders. */ |
2512 | } |
ecae49c0 |
2513 | |
2514 | /* |
2515 | =for apidoc hv_assert |
2516 | |
2517 | Check that a hash is in an internally consistent state. |
2518 | |
2519 | =cut |
2520 | */ |
2521 | |
2522 | void |
2523 | Perl_hv_assert(pTHX_ HV *hv) |
2524 | { |
27da23d5 |
2525 | dVAR; |
ecae49c0 |
2526 | HE* entry; |
2527 | int withflags = 0; |
2528 | int placeholders = 0; |
2529 | int real = 0; |
2530 | int bad = 0; |
bfcb3514 |
2531 | const I32 riter = HvRITER_get(hv); |
2532 | HE *eiter = HvEITER_get(hv); |
ecae49c0 |
2533 | |
2534 | (void)hv_iterinit(hv); |
2535 | |
2536 | while ((entry = hv_iternext_flags(hv, HV_ITERNEXT_WANTPLACEHOLDERS))) { |
2537 | /* sanity check the values */ |
2538 | if (HeVAL(entry) == &PL_sv_placeholder) { |
2539 | placeholders++; |
2540 | } else { |
2541 | real++; |
2542 | } |
2543 | /* sanity check the keys */ |
2544 | if (HeSVKEY(entry)) { |
2545 | /* Don't know what to check on SV keys. */ |
2546 | } else if (HeKUTF8(entry)) { |
2547 | withflags++; |
2548 | if (HeKWASUTF8(entry)) { |
2549 | PerlIO_printf(Perl_debug_log, |
2550 | "hash key has both WASUFT8 and UTF8: '%.*s'\n", |
2551 | (int) HeKLEN(entry), HeKEY(entry)); |
2552 | bad = 1; |
2553 | } |
2554 | } else if (HeKWASUTF8(entry)) { |
2555 | withflags++; |
2556 | } |
2557 | } |
2558 | if (!SvTIED_mg((SV*)hv, PERL_MAGIC_tied)) { |
2559 | if (HvUSEDKEYS(hv) != real) { |
2560 | PerlIO_printf(Perl_debug_log, "Count %d key(s), but hash reports %d\n", |
2561 | (int) real, (int) HvUSEDKEYS(hv)); |
2562 | bad = 1; |
2563 | } |
5d88ecd7 |
2564 | if (HvPLACEHOLDERS_get(hv) != placeholders) { |
ecae49c0 |
2565 | PerlIO_printf(Perl_debug_log, |
2566 | "Count %d placeholder(s), but hash reports %d\n", |
5d88ecd7 |
2567 | (int) placeholders, (int) HvPLACEHOLDERS_get(hv)); |
ecae49c0 |
2568 | bad = 1; |
2569 | } |
2570 | } |
2571 | if (withflags && ! HvHASKFLAGS(hv)) { |
2572 | PerlIO_printf(Perl_debug_log, |
2573 | "Hash has HASKFLAGS off but I count %d key(s) with flags\n", |
2574 | withflags); |
2575 | bad = 1; |
2576 | } |
2577 | if (bad) { |
2578 | sv_dump((SV *)hv); |
2579 | } |
bfcb3514 |
2580 | HvRITER_set(hv, riter); /* Restore hash iterator state */ |
2581 | HvEITER_set(hv, eiter); |
ecae49c0 |
2582 | } |
af3babe4 |
2583 | |
2584 | /* |
2585 | * Local variables: |
2586 | * c-indentation-style: bsd |
2587 | * c-basic-offset: 4 |
2588 | * indent-tabs-mode: t |
2589 | * End: |
2590 | * |
37442d52 |
2591 | * ex: set ts=8 sts=4 sw=4 noet: |
2592 | */ |