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; |
5e258f8c |
45 | |
46 | he = (HE*) Perl_get_arena(aTHX_ PERL_ARENA_SIZE); |
cac9b346 |
47 | |
48 | heend = &he[PERL_ARENA_SIZE / sizeof(HE) - 1]; |
d2a0f284 |
49 | PL_body_roots[HE_SVSLOT] = he; |
cac9b346 |
50 | while (he < heend) { |
51 | HeNEXT(he) = (HE*)(he + 1); |
52 | he++; |
53 | } |
54 | HeNEXT(he) = 0; |
55 | } |
56 | |
c941fb51 |
57 | #ifdef PURIFY |
58 | |
59 | #define new_HE() (HE*)safemalloc(sizeof(HE)) |
60 | #define del_HE(p) safefree((char*)p) |
61 | |
62 | #else |
63 | |
76e3520e |
64 | STATIC HE* |
cea2e8a9 |
65 | S_new_he(pTHX) |
4633a7c4 |
66 | { |
97aff369 |
67 | dVAR; |
4633a7c4 |
68 | HE* he; |
0bd48802 |
69 | void ** const root = &PL_body_roots[HE_SVSLOT]; |
6a93a7e5 |
70 | |
333f433b |
71 | LOCK_SV_MUTEX; |
6a93a7e5 |
72 | if (!*root) |
cac9b346 |
73 | S_more_he(aTHX); |
10edeb5d |
74 | he = (HE*) *root; |
ce3e5c45 |
75 | assert(he); |
6a93a7e5 |
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 * |
5f66b61c |
95 | S_save_hek_flags(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; |
45e34800 |
107 | HEK_FLAGS(hek) = (unsigned char)flags_masked | HVhek_UNSHARED; |
dcf933a4 |
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 | } |
4608196e |
128 | PL_hv_fetch_ent_mh = NULL; |
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) |
4608196e |
158 | return NULL; |
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, |
a0714e2c |
375 | NULL, 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, |
a0714e2c |
420 | (lval ? HV_FETCH_LVALUE : 0), NULL, 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) { |
1e73acc8 |
439 | if (SvSMAGICAL(hv) && SvGMAGICAL(hv)) |
440 | keysv = hv_magic_uvar_xkey(hv, keysv, action); |
e593d2fe |
441 | if (flags & HVhek_FREEKEY) |
442 | Safefree(key); |
5c144d81 |
443 | key = SvPV_const(keysv, klen); |
c1fe5510 |
444 | flags = 0; |
113738bb |
445 | is_utf8 = (SvUTF8(keysv) != 0); |
446 | } else { |
c1fe5510 |
447 | is_utf8 = ((flags & HVhek_UTF8) ? TRUE : FALSE); |
113738bb |
448 | } |
113738bb |
449 | |
b2c64049 |
450 | xhv = (XPVHV*)SvANY(hv); |
7f66fda2 |
451 | if (SvMAGICAL(hv)) { |
6136c704 |
452 | if (SvRMAGICAL(hv) && !(action & (HV_FETCH_ISSTORE|HV_FETCH_ISEXISTS))) { |
81714fb9 |
453 | MAGIC *regdata = NULL; |
e62cc96a |
454 | if (( regdata = mg_find((SV*)hv, PERL_MAGIC_regdata_names)) || |
455 | mg_find((SV*)hv, PERL_MAGIC_tied) || |
456 | SvGMAGICAL((SV*)hv)) |
457 | { |
7f66fda2 |
458 | /* XXX should be able to skimp on the HE/HEK here when |
459 | HV_FETCH_JUST_SV is true. */ |
7f66fda2 |
460 | if (!keysv) { |
461 | keysv = newSVpvn(key, klen); |
462 | if (is_utf8) { |
463 | SvUTF8_on(keysv); |
464 | } |
465 | } else { |
466 | keysv = newSVsv(keysv); |
113738bb |
467 | } |
81714fb9 |
468 | if (regdata) { |
469 | sv = Perl_reg_named_buff_sv(aTHX_ keysv); |
cbc4ed9a |
470 | if (!sv) |
471 | sv = sv_newmortal(); |
81714fb9 |
472 | } else { |
473 | sv = sv_newmortal(); |
474 | mg_copy((SV*)hv, sv, (char *)keysv, HEf_SVKEY); |
475 | } |
7f66fda2 |
476 | |
477 | /* grab a fake HE/HEK pair from the pool or make a new one */ |
478 | entry = PL_hv_fetch_ent_mh; |
479 | if (entry) |
480 | PL_hv_fetch_ent_mh = HeNEXT(entry); |
481 | else { |
482 | char *k; |
483 | entry = new_HE(); |
a02a5408 |
484 | Newx(k, HEK_BASESIZE + sizeof(SV*), char); |
7f66fda2 |
485 | HeKEY_hek(entry) = (HEK*)k; |
486 | } |
4608196e |
487 | HeNEXT(entry) = NULL; |
7f66fda2 |
488 | HeSVKEY_set(entry, keysv); |
489 | HeVAL(entry) = sv; |
490 | sv_upgrade(sv, SVt_PVLV); |
491 | LvTYPE(sv) = 'T'; |
492 | /* so we can free entry when freeing sv */ |
493 | LvTARG(sv) = (SV*)entry; |
494 | |
495 | /* XXX remove at some point? */ |
496 | if (flags & HVhek_FREEKEY) |
497 | Safefree(key); |
498 | |
499 | return entry; |
113738bb |
500 | } |
7f66fda2 |
501 | #ifdef ENV_IS_CASELESS |
502 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
503 | U32 i; |
504 | for (i = 0; i < klen; ++i) |
505 | if (isLOWER(key[i])) { |
086cb327 |
506 | /* Would be nice if we had a routine to do the |
507 | copy and upercase in a single pass through. */ |
0bd48802 |
508 | const char * const nkey = strupr(savepvn(key,klen)); |
086cb327 |
509 | /* Note that this fetch is for nkey (the uppercased |
510 | key) whereas the store is for key (the original) */ |
a0714e2c |
511 | entry = hv_fetch_common(hv, NULL, nkey, klen, |
086cb327 |
512 | HVhek_FREEKEY, /* free nkey */ |
513 | 0 /* non-LVAL fetch */, |
a0714e2c |
514 | NULL /* no value */, |
086cb327 |
515 | 0 /* compute hash */); |
516 | if (!entry && (action & HV_FETCH_LVALUE)) { |
517 | /* This call will free key if necessary. |
518 | Do it this way to encourage compiler to tail |
519 | call optimise. */ |
520 | entry = hv_fetch_common(hv, keysv, key, klen, |
521 | flags, HV_FETCH_ISSTORE, |
561b68a9 |
522 | newSV(0), hash); |
086cb327 |
523 | } else { |
524 | if (flags & HVhek_FREEKEY) |
525 | Safefree(key); |
526 | } |
527 | return entry; |
7f66fda2 |
528 | } |
902173a3 |
529 | } |
7f66fda2 |
530 | #endif |
531 | } /* ISFETCH */ |
532 | else if (SvRMAGICAL(hv) && (action & HV_FETCH_ISEXISTS)) { |
533 | if (mg_find((SV*)hv, PERL_MAGIC_tied) || SvGMAGICAL((SV*)hv)) { |
b2c64049 |
534 | /* I don't understand why hv_exists_ent has svret and sv, |
535 | whereas hv_exists only had one. */ |
9d4ba2ae |
536 | SV * const svret = sv_newmortal(); |
b2c64049 |
537 | sv = sv_newmortal(); |
7f66fda2 |
538 | |
539 | if (keysv || is_utf8) { |
540 | if (!keysv) { |
541 | keysv = newSVpvn(key, klen); |
542 | SvUTF8_on(keysv); |
543 | } else { |
544 | keysv = newSVsv(keysv); |
545 | } |
b2c64049 |
546 | mg_copy((SV*)hv, sv, (char *)sv_2mortal(keysv), HEf_SVKEY); |
547 | } else { |
548 | mg_copy((SV*)hv, sv, key, klen); |
7f66fda2 |
549 | } |
b2c64049 |
550 | if (flags & HVhek_FREEKEY) |
551 | Safefree(key); |
7f66fda2 |
552 | magic_existspack(svret, mg_find(sv, PERL_MAGIC_tiedelem)); |
553 | /* This cast somewhat evil, but I'm merely using NULL/ |
554 | not NULL to return the boolean exists. |
555 | And I know hv is not NULL. */ |
556 | return SvTRUE(svret) ? (HE *)hv : NULL; |
e7152ba2 |
557 | } |
7f66fda2 |
558 | #ifdef ENV_IS_CASELESS |
559 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
560 | /* XXX This code isn't UTF8 clean. */ |
a15d23f8 |
561 | char * const keysave = (char * const)key; |
b2c64049 |
562 | /* Will need to free this, so set FREEKEY flag. */ |
563 | key = savepvn(key,klen); |
564 | key = (const char*)strupr((char*)key); |
6136c704 |
565 | is_utf8 = FALSE; |
7f66fda2 |
566 | hash = 0; |
8b4f7dd5 |
567 | keysv = 0; |
b2c64049 |
568 | |
569 | if (flags & HVhek_FREEKEY) { |
570 | Safefree(keysave); |
571 | } |
572 | flags |= HVhek_FREEKEY; |
7f66fda2 |
573 | } |
902173a3 |
574 | #endif |
7f66fda2 |
575 | } /* ISEXISTS */ |
b2c64049 |
576 | else if (action & HV_FETCH_ISSTORE) { |
577 | bool needs_copy; |
578 | bool needs_store; |
579 | hv_magic_check (hv, &needs_copy, &needs_store); |
580 | if (needs_copy) { |
a3b680e6 |
581 | const bool save_taint = PL_tainted; |
b2c64049 |
582 | if (keysv || is_utf8) { |
583 | if (!keysv) { |
584 | keysv = newSVpvn(key, klen); |
585 | SvUTF8_on(keysv); |
586 | } |
587 | if (PL_tainting) |
588 | PL_tainted = SvTAINTED(keysv); |
589 | keysv = sv_2mortal(newSVsv(keysv)); |
590 | mg_copy((SV*)hv, val, (char*)keysv, HEf_SVKEY); |
591 | } else { |
592 | mg_copy((SV*)hv, val, key, klen); |
593 | } |
594 | |
595 | TAINT_IF(save_taint); |
1baaf5d7 |
596 | if (!needs_store) { |
b2c64049 |
597 | if (flags & HVhek_FREEKEY) |
598 | Safefree(key); |
4608196e |
599 | return NULL; |
b2c64049 |
600 | } |
601 | #ifdef ENV_IS_CASELESS |
602 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
603 | /* XXX This code isn't UTF8 clean. */ |
604 | const char *keysave = key; |
605 | /* Will need to free this, so set FREEKEY flag. */ |
606 | key = savepvn(key,klen); |
607 | key = (const char*)strupr((char*)key); |
6136c704 |
608 | is_utf8 = FALSE; |
b2c64049 |
609 | hash = 0; |
8b4f7dd5 |
610 | keysv = 0; |
b2c64049 |
611 | |
612 | if (flags & HVhek_FREEKEY) { |
613 | Safefree(keysave); |
614 | } |
615 | flags |= HVhek_FREEKEY; |
616 | } |
617 | #endif |
618 | } |
619 | } /* ISSTORE */ |
7f66fda2 |
620 | } /* SvMAGICAL */ |
fde52b5c |
621 | |
7b2c381c |
622 | if (!HvARRAY(hv)) { |
b2c64049 |
623 | if ((action & (HV_FETCH_LVALUE | HV_FETCH_ISSTORE)) |
fde52b5c |
624 | #ifdef DYNAMIC_ENV_FETCH /* if it's an %ENV lookup, we may get it on the fly */ |
8aacddc1 |
625 | || (SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) |
fde52b5c |
626 | #endif |
d58e6666 |
627 | ) { |
628 | char *array; |
a02a5408 |
629 | Newxz(array, |
cbec9347 |
630 | PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */), |
d58e6666 |
631 | char); |
632 | HvARRAY(hv) = (HE**)array; |
633 | } |
7f66fda2 |
634 | #ifdef DYNAMIC_ENV_FETCH |
635 | else if (action & HV_FETCH_ISEXISTS) { |
636 | /* for an %ENV exists, if we do an insert it's by a recursive |
637 | store call, so avoid creating HvARRAY(hv) right now. */ |
638 | } |
639 | #endif |
113738bb |
640 | else { |
641 | /* XXX remove at some point? */ |
642 | if (flags & HVhek_FREEKEY) |
643 | Safefree(key); |
644 | |
fde52b5c |
645 | return 0; |
113738bb |
646 | } |
fde52b5c |
647 | } |
648 | |
19692e8d |
649 | if (is_utf8) { |
41d88b63 |
650 | char * const keysave = (char *)key; |
f9a63242 |
651 | key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8); |
19692e8d |
652 | if (is_utf8) |
c1fe5510 |
653 | flags |= HVhek_UTF8; |
654 | else |
655 | flags &= ~HVhek_UTF8; |
7f66fda2 |
656 | if (key != keysave) { |
657 | if (flags & HVhek_FREEKEY) |
658 | Safefree(keysave); |
19692e8d |
659 | flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
7f66fda2 |
660 | } |
19692e8d |
661 | } |
f9a63242 |
662 | |
4b5190b5 |
663 | if (HvREHASH(hv)) { |
664 | PERL_HASH_INTERNAL(hash, key, klen); |
b2c64049 |
665 | /* We don't have a pointer to the hv, so we have to replicate the |
666 | flag into every HEK, so that hv_iterkeysv can see it. */ |
667 | /* And yes, you do need this even though you are not "storing" because |
fdcd69b6 |
668 | you can flip the flags below if doing an lval lookup. (And that |
669 | was put in to give the semantics Andreas was expecting.) */ |
670 | flags |= HVhek_REHASH; |
4b5190b5 |
671 | } else if (!hash) { |
113738bb |
672 | if (keysv && (SvIsCOW_shared_hash(keysv))) { |
c158a4fd |
673 | hash = SvSHARED_HASH(keysv); |
46187eeb |
674 | } else { |
675 | PERL_HASH(hash, key, klen); |
676 | } |
677 | } |
effa1e2d |
678 | |
113738bb |
679 | masked_flags = (flags & HVhek_MASK); |
680 | |
7f66fda2 |
681 | #ifdef DYNAMIC_ENV_FETCH |
4608196e |
682 | if (!HvARRAY(hv)) entry = NULL; |
7f66fda2 |
683 | else |
684 | #endif |
b2c64049 |
685 | { |
7b2c381c |
686 | entry = (HvARRAY(hv))[hash & (I32) HvMAX(hv)]; |
b2c64049 |
687 | } |
0298d7b9 |
688 | for (; entry; entry = HeNEXT(entry)) { |
fde52b5c |
689 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
690 | continue; |
eb160463 |
691 | if (HeKLEN(entry) != (I32)klen) |
fde52b5c |
692 | continue; |
1c846c1f |
693 | if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */ |
fde52b5c |
694 | continue; |
113738bb |
695 | if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8) |
c3654f1a |
696 | continue; |
b2c64049 |
697 | |
698 | if (action & (HV_FETCH_LVALUE|HV_FETCH_ISSTORE)) { |
699 | if (HeKFLAGS(entry) != masked_flags) { |
700 | /* We match if HVhek_UTF8 bit in our flags and hash key's |
701 | match. But if entry was set previously with HVhek_WASUTF8 |
702 | and key now doesn't (or vice versa) then we should change |
703 | the key's flag, as this is assignment. */ |
704 | if (HvSHAREKEYS(hv)) { |
705 | /* Need to swap the key we have for a key with the flags we |
706 | need. As keys are shared we can't just write to the |
707 | flag, so we share the new one, unshare the old one. */ |
6136c704 |
708 | HEK * const new_hek = share_hek_flags(key, klen, hash, |
6e838c70 |
709 | masked_flags); |
b2c64049 |
710 | unshare_hek (HeKEY_hek(entry)); |
711 | HeKEY_hek(entry) = new_hek; |
712 | } |
5d2b1485 |
713 | else if (hv == PL_strtab) { |
714 | /* PL_strtab is usually the only hash without HvSHAREKEYS, |
715 | so putting this test here is cheap */ |
716 | if (flags & HVhek_FREEKEY) |
717 | Safefree(key); |
718 | Perl_croak(aTHX_ S_strtab_error, |
719 | action & HV_FETCH_LVALUE ? "fetch" : "store"); |
720 | } |
b2c64049 |
721 | else |
722 | HeKFLAGS(entry) = masked_flags; |
723 | if (masked_flags & HVhek_ENABLEHVKFLAGS) |
724 | HvHASKFLAGS_on(hv); |
725 | } |
726 | if (HeVAL(entry) == &PL_sv_placeholder) { |
727 | /* yes, can store into placeholder slot */ |
728 | if (action & HV_FETCH_LVALUE) { |
729 | if (SvMAGICAL(hv)) { |
730 | /* This preserves behaviour with the old hv_fetch |
731 | implementation which at this point would bail out |
732 | with a break; (at "if we find a placeholder, we |
733 | pretend we haven't found anything") |
734 | |
735 | That break mean that if a placeholder were found, it |
736 | caused a call into hv_store, which in turn would |
737 | check magic, and if there is no magic end up pretty |
738 | much back at this point (in hv_store's code). */ |
739 | break; |
740 | } |
741 | /* LVAL fetch which actaully needs a store. */ |
561b68a9 |
742 | val = newSV(0); |
ca732855 |
743 | HvPLACEHOLDERS(hv)--; |
b2c64049 |
744 | } else { |
745 | /* store */ |
746 | if (val != &PL_sv_placeholder) |
ca732855 |
747 | HvPLACEHOLDERS(hv)--; |
b2c64049 |
748 | } |
749 | HeVAL(entry) = val; |
750 | } else if (action & HV_FETCH_ISSTORE) { |
751 | SvREFCNT_dec(HeVAL(entry)); |
752 | HeVAL(entry) = val; |
753 | } |
27bcc0a7 |
754 | } else if (HeVAL(entry) == &PL_sv_placeholder) { |
b2c64049 |
755 | /* if we find a placeholder, we pretend we haven't found |
756 | anything */ |
8aacddc1 |
757 | break; |
b2c64049 |
758 | } |
113738bb |
759 | if (flags & HVhek_FREEKEY) |
760 | Safefree(key); |
fde52b5c |
761 | return entry; |
762 | } |
763 | #ifdef DYNAMIC_ENV_FETCH /* %ENV lookup? If so, try to fetch the value now */ |
0ed29950 |
764 | if (!(action & HV_FETCH_ISSTORE) |
765 | && SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) { |
a6c40364 |
766 | unsigned long len; |
9d4ba2ae |
767 | const char * const env = PerlEnv_ENVgetenv_len(key,&len); |
a6c40364 |
768 | if (env) { |
769 | sv = newSVpvn(env,len); |
770 | SvTAINTED_on(sv); |
7fd3d16e |
771 | return hv_fetch_common(hv,keysv,key,klen,flags,HV_FETCH_ISSTORE,sv, |
b2c64049 |
772 | hash); |
a6c40364 |
773 | } |
fde52b5c |
774 | } |
775 | #endif |
7f66fda2 |
776 | |
777 | if (!entry && SvREADONLY(hv) && !(action & HV_FETCH_ISEXISTS)) { |
c445ea15 |
778 | hv_notallowed(flags, key, klen, |
c8cd6465 |
779 | "Attempt to access disallowed key '%"SVf"' in" |
780 | " a restricted hash"); |
1b1f1335 |
781 | } |
b2c64049 |
782 | if (!(action & (HV_FETCH_LVALUE|HV_FETCH_ISSTORE))) { |
783 | /* Not doing some form of store, so return failure. */ |
784 | if (flags & HVhek_FREEKEY) |
785 | Safefree(key); |
786 | return 0; |
787 | } |
113738bb |
788 | if (action & HV_FETCH_LVALUE) { |
561b68a9 |
789 | val = newSV(0); |
b2c64049 |
790 | if (SvMAGICAL(hv)) { |
791 | /* At this point the old hv_fetch code would call to hv_store, |
792 | which in turn might do some tied magic. So we need to make that |
793 | magic check happen. */ |
794 | /* gonna assign to this, so it better be there */ |
795 | return hv_fetch_common(hv, keysv, key, klen, flags, |
796 | HV_FETCH_ISSTORE, val, hash); |
797 | /* XXX Surely that could leak if the fetch-was-store fails? |
798 | Just like the hv_fetch. */ |
113738bb |
799 | } |
800 | } |
801 | |
b2c64049 |
802 | /* Welcome to hv_store... */ |
803 | |
7b2c381c |
804 | if (!HvARRAY(hv)) { |
b2c64049 |
805 | /* Not sure if we can get here. I think the only case of oentry being |
806 | NULL is for %ENV with dynamic env fetch. But that should disappear |
807 | with magic in the previous code. */ |
d58e6666 |
808 | char *array; |
a02a5408 |
809 | Newxz(array, |
b2c64049 |
810 | PERL_HV_ARRAY_ALLOC_BYTES(xhv->xhv_max+1 /* HvMAX(hv)+1 */), |
d58e6666 |
811 | char); |
812 | HvARRAY(hv) = (HE**)array; |
b2c64049 |
813 | } |
814 | |
7b2c381c |
815 | oentry = &(HvARRAY(hv))[hash & (I32) xhv->xhv_max]; |
ab4af705 |
816 | |
b2c64049 |
817 | entry = new_HE(); |
818 | /* share_hek_flags will do the free for us. This might be considered |
819 | bad API design. */ |
820 | if (HvSHAREKEYS(hv)) |
6e838c70 |
821 | HeKEY_hek(entry) = share_hek_flags(key, klen, hash, flags); |
5d2b1485 |
822 | else if (hv == PL_strtab) { |
823 | /* PL_strtab is usually the only hash without HvSHAREKEYS, so putting |
824 | this test here is cheap */ |
825 | if (flags & HVhek_FREEKEY) |
826 | Safefree(key); |
827 | Perl_croak(aTHX_ S_strtab_error, |
828 | action & HV_FETCH_LVALUE ? "fetch" : "store"); |
829 | } |
b2c64049 |
830 | else /* gotta do the real thing */ |
831 | HeKEY_hek(entry) = save_hek_flags(key, klen, hash, flags); |
832 | HeVAL(entry) = val; |
833 | HeNEXT(entry) = *oentry; |
834 | *oentry = entry; |
835 | |
836 | if (val == &PL_sv_placeholder) |
ca732855 |
837 | HvPLACEHOLDERS(hv)++; |
b2c64049 |
838 | if (masked_flags & HVhek_ENABLEHVKFLAGS) |
839 | HvHASKFLAGS_on(hv); |
840 | |
0298d7b9 |
841 | { |
842 | const HE *counter = HeNEXT(entry); |
843 | |
4c7185a0 |
844 | xhv->xhv_keys++; /* HvTOTALKEYS(hv)++ */ |
0298d7b9 |
845 | if (!counter) { /* initial entry? */ |
846 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
847 | } else if (xhv->xhv_keys > (IV)xhv->xhv_max) { |
848 | hsplit(hv); |
849 | } else if(!HvREHASH(hv)) { |
850 | U32 n_links = 1; |
851 | |
852 | while ((counter = HeNEXT(counter))) |
853 | n_links++; |
854 | |
855 | if (n_links > HV_MAX_LENGTH_BEFORE_SPLIT) { |
856 | /* Use only the old HvKEYS(hv) > HvMAX(hv) condition to limit |
857 | bucket splits on a rehashed hash, as we're not going to |
858 | split it again, and if someone is lucky (evil) enough to |
859 | get all the keys in one list they could exhaust our memory |
860 | as we repeatedly double the number of buckets on every |
861 | entry. Linear search feels a less worse thing to do. */ |
862 | hsplit(hv); |
863 | } |
864 | } |
fde52b5c |
865 | } |
b2c64049 |
866 | |
867 | return entry; |
fde52b5c |
868 | } |
869 | |
864dbfa3 |
870 | STATIC void |
b0e6ae5b |
871 | S_hv_magic_check(HV *hv, bool *needs_copy, bool *needs_store) |
d0066dc7 |
872 | { |
a3b680e6 |
873 | const MAGIC *mg = SvMAGIC(hv); |
d0066dc7 |
874 | *needs_copy = FALSE; |
875 | *needs_store = TRUE; |
876 | while (mg) { |
877 | if (isUPPER(mg->mg_type)) { |
878 | *needs_copy = TRUE; |
d60c5a05 |
879 | if (mg->mg_type == PERL_MAGIC_tied) { |
d0066dc7 |
880 | *needs_store = FALSE; |
4ab2a30b |
881 | return; /* We've set all there is to set. */ |
d0066dc7 |
882 | } |
883 | } |
884 | mg = mg->mg_moremagic; |
885 | } |
886 | } |
887 | |
954c1994 |
888 | /* |
a3bcc51e |
889 | =for apidoc hv_scalar |
890 | |
891 | Evaluates the hash in scalar context and returns the result. Handles magic when the hash is tied. |
892 | |
893 | =cut |
894 | */ |
895 | |
896 | SV * |
897 | Perl_hv_scalar(pTHX_ HV *hv) |
898 | { |
a3bcc51e |
899 | SV *sv; |
823a54a3 |
900 | |
901 | if (SvRMAGICAL(hv)) { |
902 | MAGIC * const mg = mg_find((SV*)hv, PERL_MAGIC_tied); |
903 | if (mg) |
904 | return magic_scalarpack(hv, mg); |
905 | } |
a3bcc51e |
906 | |
907 | sv = sv_newmortal(); |
908 | if (HvFILL((HV*)hv)) |
909 | Perl_sv_setpvf(aTHX_ sv, "%ld/%ld", |
910 | (long)HvFILL(hv), (long)HvMAX(hv) + 1); |
911 | else |
912 | sv_setiv(sv, 0); |
913 | |
914 | return sv; |
915 | } |
916 | |
917 | /* |
954c1994 |
918 | =for apidoc hv_delete |
919 | |
920 | Deletes a key/value pair in the hash. The value SV is removed from the |
1c846c1f |
921 | hash and returned to the caller. The C<klen> is the length of the key. |
954c1994 |
922 | The C<flags> value will normally be zero; if set to G_DISCARD then NULL |
923 | will be returned. |
924 | |
925 | =cut |
926 | */ |
927 | |
79072805 |
928 | SV * |
cd6d36ac |
929 | Perl_hv_delete(pTHX_ HV *hv, const char *key, I32 klen_i32, I32 flags) |
79072805 |
930 | { |
cd6d36ac |
931 | STRLEN klen; |
6136c704 |
932 | int k_flags; |
cd6d36ac |
933 | |
934 | if (klen_i32 < 0) { |
935 | klen = -klen_i32; |
6136c704 |
936 | k_flags = HVhek_UTF8; |
cd6d36ac |
937 | } else { |
938 | klen = klen_i32; |
6136c704 |
939 | k_flags = 0; |
cd6d36ac |
940 | } |
941 | return hv_delete_common(hv, NULL, key, klen, k_flags, flags, 0); |
fde52b5c |
942 | } |
943 | |
954c1994 |
944 | /* |
945 | =for apidoc hv_delete_ent |
946 | |
947 | Deletes a key/value pair in the hash. The value SV is removed from the |
948 | hash and returned to the caller. The C<flags> value will normally be zero; |
949 | if set to G_DISCARD then NULL will be returned. C<hash> can be a valid |
950 | precomputed hash value, or 0 to ask for it to be computed. |
951 | |
952 | =cut |
953 | */ |
954 | |
fabdb6c0 |
955 | /* XXX This looks like an ideal candidate to inline */ |
fde52b5c |
956 | SV * |
864dbfa3 |
957 | Perl_hv_delete_ent(pTHX_ HV *hv, SV *keysv, I32 flags, U32 hash) |
fde52b5c |
958 | { |
cd6d36ac |
959 | return hv_delete_common(hv, keysv, NULL, 0, 0, flags, hash); |
f1317c8d |
960 | } |
961 | |
8f8d40ab |
962 | STATIC SV * |
cd6d36ac |
963 | S_hv_delete_common(pTHX_ HV *hv, SV *keysv, const char *key, STRLEN klen, |
964 | int k_flags, I32 d_flags, U32 hash) |
f1317c8d |
965 | { |
27da23d5 |
966 | dVAR; |
cbec9347 |
967 | register XPVHV* xhv; |
fde52b5c |
968 | register HE *entry; |
969 | register HE **oentry; |
9e720f71 |
970 | HE *const *first_entry; |
da58a35d |
971 | bool is_utf8; |
7a9669ca |
972 | int masked_flags; |
1c846c1f |
973 | |
fde52b5c |
974 | if (!hv) |
a0714e2c |
975 | return NULL; |
f1317c8d |
976 | |
977 | if (keysv) { |
1e73acc8 |
978 | if (SvSMAGICAL(hv) && SvGMAGICAL(hv)) |
979 | keysv = hv_magic_uvar_xkey(hv, keysv, -1); |
e593d2fe |
980 | if (k_flags & HVhek_FREEKEY) |
981 | Safefree(key); |
5c144d81 |
982 | key = SvPV_const(keysv, klen); |
cd6d36ac |
983 | k_flags = 0; |
f1317c8d |
984 | is_utf8 = (SvUTF8(keysv) != 0); |
985 | } else { |
cd6d36ac |
986 | is_utf8 = ((k_flags & HVhek_UTF8) ? TRUE : FALSE); |
f1317c8d |
987 | } |
f1317c8d |
988 | |
fde52b5c |
989 | if (SvRMAGICAL(hv)) { |
0a0bb7c7 |
990 | bool needs_copy; |
991 | bool needs_store; |
992 | hv_magic_check (hv, &needs_copy, &needs_store); |
993 | |
f1317c8d |
994 | if (needs_copy) { |
6136c704 |
995 | SV *sv; |
7a9669ca |
996 | entry = hv_fetch_common(hv, keysv, key, klen, |
997 | k_flags & ~HVhek_FREEKEY, HV_FETCH_LVALUE, |
a0714e2c |
998 | NULL, hash); |
7a9669ca |
999 | sv = entry ? HeVAL(entry) : NULL; |
f1317c8d |
1000 | if (sv) { |
1001 | if (SvMAGICAL(sv)) { |
1002 | mg_clear(sv); |
1003 | } |
1004 | if (!needs_store) { |
1005 | if (mg_find(sv, PERL_MAGIC_tiedelem)) { |
1006 | /* No longer an element */ |
1007 | sv_unmagic(sv, PERL_MAGIC_tiedelem); |
1008 | return sv; |
1009 | } |
a0714e2c |
1010 | return NULL; /* element cannot be deleted */ |
f1317c8d |
1011 | } |
902173a3 |
1012 | #ifdef ENV_IS_CASELESS |
8167a60a |
1013 | else if (mg_find((SV*)hv, PERL_MAGIC_env)) { |
1014 | /* XXX This code isn't UTF8 clean. */ |
1015 | keysv = sv_2mortal(newSVpvn(key,klen)); |
1016 | if (k_flags & HVhek_FREEKEY) { |
1017 | Safefree(key); |
1018 | } |
1019 | key = strupr(SvPVX(keysv)); |
1020 | is_utf8 = 0; |
1021 | k_flags = 0; |
1022 | hash = 0; |
7f66fda2 |
1023 | } |
510ac311 |
1024 | #endif |
2fd1c6b8 |
1025 | } |
2fd1c6b8 |
1026 | } |
fde52b5c |
1027 | } |
cbec9347 |
1028 | xhv = (XPVHV*)SvANY(hv); |
7b2c381c |
1029 | if (!HvARRAY(hv)) |
a0714e2c |
1030 | return NULL; |
fde52b5c |
1031 | |
19692e8d |
1032 | if (is_utf8) { |
c445ea15 |
1033 | const char * const keysave = key; |
b464bac0 |
1034 | key = (char*)bytes_from_utf8((U8*)key, &klen, &is_utf8); |
cd6d36ac |
1035 | |
19692e8d |
1036 | if (is_utf8) |
cd6d36ac |
1037 | k_flags |= HVhek_UTF8; |
1038 | else |
1039 | k_flags &= ~HVhek_UTF8; |
7f66fda2 |
1040 | if (key != keysave) { |
1041 | if (k_flags & HVhek_FREEKEY) { |
1042 | /* This shouldn't happen if our caller does what we expect, |
1043 | but strictly the API allows it. */ |
1044 | Safefree(keysave); |
1045 | } |
1046 | k_flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
1047 | } |
cd6d36ac |
1048 | HvHASKFLAGS_on((SV*)hv); |
19692e8d |
1049 | } |
f9a63242 |
1050 | |
4b5190b5 |
1051 | if (HvREHASH(hv)) { |
1052 | PERL_HASH_INTERNAL(hash, key, klen); |
1053 | } else if (!hash) { |
7a9669ca |
1054 | if (keysv && (SvIsCOW_shared_hash(keysv))) { |
c158a4fd |
1055 | hash = SvSHARED_HASH(keysv); |
7a9669ca |
1056 | } else { |
1057 | PERL_HASH(hash, key, klen); |
1058 | } |
4b5190b5 |
1059 | } |
fde52b5c |
1060 | |
7a9669ca |
1061 | masked_flags = (k_flags & HVhek_MASK); |
1062 | |
9e720f71 |
1063 | first_entry = oentry = &(HvARRAY(hv))[hash & (I32) HvMAX(hv)]; |
fde52b5c |
1064 | entry = *oentry; |
9e720f71 |
1065 | for (; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
6136c704 |
1066 | SV *sv; |
fde52b5c |
1067 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
1068 | continue; |
eb160463 |
1069 | if (HeKLEN(entry) != (I32)klen) |
fde52b5c |
1070 | continue; |
1c846c1f |
1071 | if (HeKEY(entry) != key && memNE(HeKEY(entry),key,klen)) /* is this it? */ |
fde52b5c |
1072 | continue; |
7a9669ca |
1073 | if ((HeKFLAGS(entry) ^ masked_flags) & HVhek_UTF8) |
c3654f1a |
1074 | continue; |
8aacddc1 |
1075 | |
5d2b1485 |
1076 | if (hv == PL_strtab) { |
1077 | if (k_flags & HVhek_FREEKEY) |
1078 | Safefree(key); |
1079 | Perl_croak(aTHX_ S_strtab_error, "delete"); |
1080 | } |
1081 | |
8aacddc1 |
1082 | /* if placeholder is here, it's already been deleted.... */ |
6136c704 |
1083 | if (HeVAL(entry) == &PL_sv_placeholder) { |
1084 | if (k_flags & HVhek_FREEKEY) |
1085 | Safefree(key); |
1086 | return NULL; |
8aacddc1 |
1087 | } |
6136c704 |
1088 | if (SvREADONLY(hv) && HeVAL(entry) && SvREADONLY(HeVAL(entry))) { |
d4c19fe8 |
1089 | hv_notallowed(k_flags, key, klen, |
c8cd6465 |
1090 | "Attempt to delete readonly key '%"SVf"' from" |
1091 | " a restricted hash"); |
8aacddc1 |
1092 | } |
b84d0860 |
1093 | if (k_flags & HVhek_FREEKEY) |
1094 | Safefree(key); |
8aacddc1 |
1095 | |
cd6d36ac |
1096 | if (d_flags & G_DISCARD) |
a0714e2c |
1097 | sv = NULL; |
94f7643d |
1098 | else { |
79d01fbf |
1099 | sv = sv_2mortal(HeVAL(entry)); |
7996736c |
1100 | HeVAL(entry) = &PL_sv_placeholder; |
94f7643d |
1101 | } |
8aacddc1 |
1102 | |
1103 | /* |
1104 | * If a restricted hash, rather than really deleting the entry, put |
1105 | * a placeholder there. This marks the key as being "approved", so |
1106 | * we can still access via not-really-existing key without raising |
1107 | * an error. |
1108 | */ |
1109 | if (SvREADONLY(hv)) { |
754604c4 |
1110 | SvREFCNT_dec(HeVAL(entry)); |
7996736c |
1111 | HeVAL(entry) = &PL_sv_placeholder; |
8aacddc1 |
1112 | /* We'll be saving this slot, so the number of allocated keys |
1113 | * doesn't go down, but the number placeholders goes up */ |
ca732855 |
1114 | HvPLACEHOLDERS(hv)++; |
8aacddc1 |
1115 | } else { |
a26e96df |
1116 | *oentry = HeNEXT(entry); |
9e720f71 |
1117 | if(!*first_entry) { |
a26e96df |
1118 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
9e720f71 |
1119 | } |
b79f7545 |
1120 | if (SvOOK(hv) && entry == HvAUX(hv)->xhv_eiter /* HvEITER(hv) */) |
8aacddc1 |
1121 | HvLAZYDEL_on(hv); |
1122 | else |
1123 | hv_free_ent(hv, entry); |
4c7185a0 |
1124 | xhv->xhv_keys--; /* HvTOTALKEYS(hv)-- */ |
574c8022 |
1125 | if (xhv->xhv_keys == 0) |
19692e8d |
1126 | HvHASKFLAGS_off(hv); |
8aacddc1 |
1127 | } |
79072805 |
1128 | return sv; |
1129 | } |
8aacddc1 |
1130 | if (SvREADONLY(hv)) { |
d4c19fe8 |
1131 | hv_notallowed(k_flags, key, klen, |
c8cd6465 |
1132 | "Attempt to delete disallowed key '%"SVf"' from" |
1133 | " a restricted hash"); |
8aacddc1 |
1134 | } |
1135 | |
19692e8d |
1136 | if (k_flags & HVhek_FREEKEY) |
f9a63242 |
1137 | Safefree(key); |
a0714e2c |
1138 | return NULL; |
79072805 |
1139 | } |
1140 | |
76e3520e |
1141 | STATIC void |
cea2e8a9 |
1142 | S_hsplit(pTHX_ HV *hv) |
79072805 |
1143 | { |
97aff369 |
1144 | dVAR; |
cbec9347 |
1145 | register XPVHV* xhv = (XPVHV*)SvANY(hv); |
a3b680e6 |
1146 | const I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */ |
79072805 |
1147 | register I32 newsize = oldsize * 2; |
1148 | register I32 i; |
7b2c381c |
1149 | char *a = (char*) HvARRAY(hv); |
72311751 |
1150 | register HE **aep; |
79072805 |
1151 | register HE **oentry; |
4b5190b5 |
1152 | int longest_chain = 0; |
1153 | int was_shared; |
79072805 |
1154 | |
18026298 |
1155 | /*PerlIO_printf(PerlIO_stderr(), "hsplit called for %p which had %d\n", |
1156 | hv, (int) oldsize);*/ |
1157 | |
5d88ecd7 |
1158 | if (HvPLACEHOLDERS_get(hv) && !SvREADONLY(hv)) { |
18026298 |
1159 | /* Can make this clear any placeholders first for non-restricted hashes, |
1160 | even though Storable rebuilds restricted hashes by putting in all the |
1161 | placeholders (first) before turning on the readonly flag, because |
1162 | Storable always pre-splits the hash. */ |
1163 | hv_clear_placeholders(hv); |
1164 | } |
1165 | |
3280af22 |
1166 | PL_nomemok = TRUE; |
8d6dde3e |
1167 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
b79f7545 |
1168 | Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
1169 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
422a93e5 |
1170 | if (!a) { |
4a33f861 |
1171 | PL_nomemok = FALSE; |
422a93e5 |
1172 | return; |
1173 | } |
b79f7545 |
1174 | if (SvOOK(hv)) { |
7a9b70e9 |
1175 | Copy(&a[oldsize * sizeof(HE*)], &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
b79f7545 |
1176 | } |
4633a7c4 |
1177 | #else |
a02a5408 |
1178 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
b79f7545 |
1179 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
422a93e5 |
1180 | if (!a) { |
3280af22 |
1181 | PL_nomemok = FALSE; |
422a93e5 |
1182 | return; |
1183 | } |
7b2c381c |
1184 | Copy(HvARRAY(hv), a, oldsize * sizeof(HE*), char); |
b79f7545 |
1185 | if (SvOOK(hv)) { |
1186 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
1187 | } |
fba3b22e |
1188 | if (oldsize >= 64) { |
7b2c381c |
1189 | offer_nice_chunk(HvARRAY(hv), |
b79f7545 |
1190 | PERL_HV_ARRAY_ALLOC_BYTES(oldsize) |
1191 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0)); |
4633a7c4 |
1192 | } |
1193 | else |
7b2c381c |
1194 | Safefree(HvARRAY(hv)); |
4633a7c4 |
1195 | #endif |
1196 | |
3280af22 |
1197 | PL_nomemok = FALSE; |
72311751 |
1198 | Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/ |
cbec9347 |
1199 | xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */ |
7b2c381c |
1200 | HvARRAY(hv) = (HE**) a; |
72311751 |
1201 | aep = (HE**)a; |
79072805 |
1202 | |
72311751 |
1203 | for (i=0; i<oldsize; i++,aep++) { |
4b5190b5 |
1204 | int left_length = 0; |
1205 | int right_length = 0; |
a3b680e6 |
1206 | register HE *entry; |
1207 | register HE **bep; |
4b5190b5 |
1208 | |
72311751 |
1209 | if (!*aep) /* non-existent */ |
79072805 |
1210 | continue; |
72311751 |
1211 | bep = aep+oldsize; |
1212 | for (oentry = aep, entry = *aep; entry; entry = *oentry) { |
eb160463 |
1213 | if ((HeHASH(entry) & newsize) != (U32)i) { |
fde52b5c |
1214 | *oentry = HeNEXT(entry); |
72311751 |
1215 | HeNEXT(entry) = *bep; |
1216 | if (!*bep) |
cbec9347 |
1217 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
72311751 |
1218 | *bep = entry; |
4b5190b5 |
1219 | right_length++; |
79072805 |
1220 | continue; |
1221 | } |
4b5190b5 |
1222 | else { |
fde52b5c |
1223 | oentry = &HeNEXT(entry); |
4b5190b5 |
1224 | left_length++; |
1225 | } |
79072805 |
1226 | } |
72311751 |
1227 | if (!*aep) /* everything moved */ |
cbec9347 |
1228 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
4b5190b5 |
1229 | /* I think we don't actually need to keep track of the longest length, |
1230 | merely flag if anything is too long. But for the moment while |
1231 | developing this code I'll track it. */ |
1232 | if (left_length > longest_chain) |
1233 | longest_chain = left_length; |
1234 | if (right_length > longest_chain) |
1235 | longest_chain = right_length; |
1236 | } |
1237 | |
1238 | |
1239 | /* Pick your policy for "hashing isn't working" here: */ |
fdcd69b6 |
1240 | if (longest_chain <= HV_MAX_LENGTH_BEFORE_SPLIT /* split worked? */ |
4b5190b5 |
1241 | || HvREHASH(hv)) { |
1242 | return; |
79072805 |
1243 | } |
4b5190b5 |
1244 | |
1245 | if (hv == PL_strtab) { |
1246 | /* Urg. Someone is doing something nasty to the string table. |
1247 | Can't win. */ |
1248 | return; |
1249 | } |
1250 | |
1251 | /* Awooga. Awooga. Pathological data. */ |
fdcd69b6 |
1252 | /*PerlIO_printf(PerlIO_stderr(), "%p %d of %d with %d/%d buckets\n", hv, |
4b5190b5 |
1253 | longest_chain, HvTOTALKEYS(hv), HvFILL(hv), 1+HvMAX(hv));*/ |
1254 | |
1255 | ++newsize; |
a02a5408 |
1256 | Newxz(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
b79f7545 |
1257 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
1258 | if (SvOOK(hv)) { |
1259 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
1260 | } |
1261 | |
4b5190b5 |
1262 | was_shared = HvSHAREKEYS(hv); |
1263 | |
1264 | xhv->xhv_fill = 0; |
1265 | HvSHAREKEYS_off(hv); |
1266 | HvREHASH_on(hv); |
1267 | |
7b2c381c |
1268 | aep = HvARRAY(hv); |
4b5190b5 |
1269 | |
1270 | for (i=0; i<newsize; i++,aep++) { |
a3b680e6 |
1271 | register HE *entry = *aep; |
4b5190b5 |
1272 | while (entry) { |
1273 | /* We're going to trash this HE's next pointer when we chain it |
1274 | into the new hash below, so store where we go next. */ |
9d4ba2ae |
1275 | HE * const next = HeNEXT(entry); |
4b5190b5 |
1276 | UV hash; |
a3b680e6 |
1277 | HE **bep; |
4b5190b5 |
1278 | |
1279 | /* Rehash it */ |
1280 | PERL_HASH_INTERNAL(hash, HeKEY(entry), HeKLEN(entry)); |
1281 | |
1282 | if (was_shared) { |
1283 | /* Unshare it. */ |
aec46f14 |
1284 | HEK * const new_hek |
4b5190b5 |
1285 | = save_hek_flags(HeKEY(entry), HeKLEN(entry), |
1286 | hash, HeKFLAGS(entry)); |
1287 | unshare_hek (HeKEY_hek(entry)); |
1288 | HeKEY_hek(entry) = new_hek; |
1289 | } else { |
1290 | /* Not shared, so simply write the new hash in. */ |
1291 | HeHASH(entry) = hash; |
1292 | } |
1293 | /*PerlIO_printf(PerlIO_stderr(), "%d ", HeKFLAGS(entry));*/ |
1294 | HEK_REHASH_on(HeKEY_hek(entry)); |
1295 | /*PerlIO_printf(PerlIO_stderr(), "%d\n", HeKFLAGS(entry));*/ |
1296 | |
1297 | /* Copy oentry to the correct new chain. */ |
1298 | bep = ((HE**)a) + (hash & (I32) xhv->xhv_max); |
1299 | if (!*bep) |
1300 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
1301 | HeNEXT(entry) = *bep; |
1302 | *bep = entry; |
1303 | |
1304 | entry = next; |
1305 | } |
1306 | } |
7b2c381c |
1307 | Safefree (HvARRAY(hv)); |
1308 | HvARRAY(hv) = (HE **)a; |
79072805 |
1309 | } |
1310 | |
72940dca |
1311 | void |
864dbfa3 |
1312 | Perl_hv_ksplit(pTHX_ HV *hv, IV newmax) |
72940dca |
1313 | { |
97aff369 |
1314 | dVAR; |
cbec9347 |
1315 | register XPVHV* xhv = (XPVHV*)SvANY(hv); |
a3b680e6 |
1316 | const I32 oldsize = (I32) xhv->xhv_max+1; /* HvMAX(hv)+1 (sick) */ |
72940dca |
1317 | register I32 newsize; |
1318 | register I32 i; |
72311751 |
1319 | register char *a; |
1320 | register HE **aep; |
72940dca |
1321 | register HE *entry; |
1322 | register HE **oentry; |
1323 | |
1324 | newsize = (I32) newmax; /* possible truncation here */ |
1325 | if (newsize != newmax || newmax <= oldsize) |
1326 | return; |
1327 | while ((newsize & (1 + ~newsize)) != newsize) { |
1328 | newsize &= ~(newsize & (1 + ~newsize)); /* get proper power of 2 */ |
1329 | } |
1330 | if (newsize < newmax) |
1331 | newsize *= 2; |
1332 | if (newsize < newmax) |
1333 | return; /* overflow detection */ |
1334 | |
7b2c381c |
1335 | a = (char *) HvARRAY(hv); |
72940dca |
1336 | if (a) { |
3280af22 |
1337 | PL_nomemok = TRUE; |
8d6dde3e |
1338 | #if defined(STRANGE_MALLOC) || defined(MYMALLOC) |
b79f7545 |
1339 | Renew(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
1340 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
8aacddc1 |
1341 | if (!a) { |
4a33f861 |
1342 | PL_nomemok = FALSE; |
422a93e5 |
1343 | return; |
1344 | } |
b79f7545 |
1345 | if (SvOOK(hv)) { |
7a9b70e9 |
1346 | Copy(&a[oldsize * sizeof(HE*)], &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
b79f7545 |
1347 | } |
72940dca |
1348 | #else |
a02a5408 |
1349 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize) |
b79f7545 |
1350 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0), char); |
8aacddc1 |
1351 | if (!a) { |
3280af22 |
1352 | PL_nomemok = FALSE; |
422a93e5 |
1353 | return; |
1354 | } |
7b2c381c |
1355 | Copy(HvARRAY(hv), a, oldsize * sizeof(HE*), char); |
b79f7545 |
1356 | if (SvOOK(hv)) { |
1357 | Copy(HvAUX(hv), &a[newsize * sizeof(HE*)], 1, struct xpvhv_aux); |
1358 | } |
fba3b22e |
1359 | if (oldsize >= 64) { |
7b2c381c |
1360 | offer_nice_chunk(HvARRAY(hv), |
b79f7545 |
1361 | PERL_HV_ARRAY_ALLOC_BYTES(oldsize) |
1362 | + (SvOOK(hv) ? sizeof(struct xpvhv_aux) : 0)); |
72940dca |
1363 | } |
1364 | else |
7b2c381c |
1365 | Safefree(HvARRAY(hv)); |
72940dca |
1366 | #endif |
3280af22 |
1367 | PL_nomemok = FALSE; |
72311751 |
1368 | Zero(&a[oldsize * sizeof(HE*)], (newsize-oldsize) * sizeof(HE*), char); /* zero 2nd half*/ |
72940dca |
1369 | } |
1370 | else { |
a02a5408 |
1371 | Newxz(a, PERL_HV_ARRAY_ALLOC_BYTES(newsize), char); |
72940dca |
1372 | } |
cbec9347 |
1373 | xhv->xhv_max = --newsize; /* HvMAX(hv) = --newsize */ |
7b2c381c |
1374 | HvARRAY(hv) = (HE **) a; |
cbec9347 |
1375 | if (!xhv->xhv_fill /* !HvFILL(hv) */) /* skip rest if no entries */ |
72940dca |
1376 | return; |
1377 | |
72311751 |
1378 | aep = (HE**)a; |
1379 | for (i=0; i<oldsize; i++,aep++) { |
1380 | if (!*aep) /* non-existent */ |
72940dca |
1381 | continue; |
72311751 |
1382 | for (oentry = aep, entry = *aep; entry; entry = *oentry) { |
6136c704 |
1383 | register I32 j = (HeHASH(entry) & newsize); |
1384 | |
1385 | if (j != i) { |
72940dca |
1386 | j -= i; |
1387 | *oentry = HeNEXT(entry); |
72311751 |
1388 | if (!(HeNEXT(entry) = aep[j])) |
cbec9347 |
1389 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
72311751 |
1390 | aep[j] = entry; |
72940dca |
1391 | continue; |
1392 | } |
1393 | else |
1394 | oentry = &HeNEXT(entry); |
1395 | } |
72311751 |
1396 | if (!*aep) /* everything moved */ |
cbec9347 |
1397 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
72940dca |
1398 | } |
1399 | } |
1400 | |
954c1994 |
1401 | /* |
1402 | =for apidoc newHV |
1403 | |
1404 | Creates a new HV. The reference count is set to 1. |
1405 | |
1406 | =cut |
1407 | */ |
1408 | |
79072805 |
1409 | HV * |
864dbfa3 |
1410 | Perl_newHV(pTHX) |
79072805 |
1411 | { |
cbec9347 |
1412 | register XPVHV* xhv; |
561b68a9 |
1413 | HV * const hv = (HV*)newSV(0); |
79072805 |
1414 | |
a0d0e21e |
1415 | sv_upgrade((SV *)hv, SVt_PVHV); |
cbec9347 |
1416 | xhv = (XPVHV*)SvANY(hv); |
79072805 |
1417 | SvPOK_off(hv); |
1418 | SvNOK_off(hv); |
1c846c1f |
1419 | #ifndef NODEFAULT_SHAREKEYS |
fde52b5c |
1420 | HvSHAREKEYS_on(hv); /* key-sharing on by default */ |
1c846c1f |
1421 | #endif |
4b5190b5 |
1422 | |
cbec9347 |
1423 | xhv->xhv_max = 7; /* HvMAX(hv) = 7 (start with 8 buckets) */ |
1424 | xhv->xhv_fill = 0; /* HvFILL(hv) = 0 */ |
79072805 |
1425 | return hv; |
1426 | } |
1427 | |
b3ac6de7 |
1428 | HV * |
864dbfa3 |
1429 | Perl_newHVhv(pTHX_ HV *ohv) |
b3ac6de7 |
1430 | { |
9d4ba2ae |
1431 | HV * const hv = newHV(); |
4beac62f |
1432 | STRLEN hv_max, hv_fill; |
4beac62f |
1433 | |
1434 | if (!ohv || (hv_fill = HvFILL(ohv)) == 0) |
1435 | return hv; |
4beac62f |
1436 | hv_max = HvMAX(ohv); |
b3ac6de7 |
1437 | |
b56ba0bf |
1438 | if (!SvMAGICAL((SV *)ohv)) { |
1439 | /* It's an ordinary hash, so copy it fast. AMS 20010804 */ |
eb160463 |
1440 | STRLEN i; |
a3b680e6 |
1441 | const bool shared = !!HvSHAREKEYS(ohv); |
aec46f14 |
1442 | HE **ents, ** const oents = (HE **)HvARRAY(ohv); |
ff875642 |
1443 | char *a; |
a02a5408 |
1444 | Newx(a, PERL_HV_ARRAY_ALLOC_BYTES(hv_max+1), char); |
ff875642 |
1445 | ents = (HE**)a; |
b56ba0bf |
1446 | |
1447 | /* In each bucket... */ |
1448 | for (i = 0; i <= hv_max; i++) { |
6136c704 |
1449 | HE *prev = NULL; |
aec46f14 |
1450 | HE *oent = oents[i]; |
b56ba0bf |
1451 | |
1452 | if (!oent) { |
1453 | ents[i] = NULL; |
1454 | continue; |
1455 | } |
1456 | |
1457 | /* Copy the linked list of entries. */ |
aec46f14 |
1458 | for (; oent; oent = HeNEXT(oent)) { |
a3b680e6 |
1459 | const U32 hash = HeHASH(oent); |
1460 | const char * const key = HeKEY(oent); |
1461 | const STRLEN len = HeKLEN(oent); |
1462 | const int flags = HeKFLAGS(oent); |
6136c704 |
1463 | HE * const ent = new_HE(); |
b56ba0bf |
1464 | |
45dea987 |
1465 | HeVAL(ent) = newSVsv(HeVAL(oent)); |
19692e8d |
1466 | HeKEY_hek(ent) |
6e838c70 |
1467 | = shared ? share_hek_flags(key, len, hash, flags) |
19692e8d |
1468 | : save_hek_flags(key, len, hash, flags); |
b56ba0bf |
1469 | if (prev) |
1470 | HeNEXT(prev) = ent; |
1471 | else |
1472 | ents[i] = ent; |
1473 | prev = ent; |
1474 | HeNEXT(ent) = NULL; |
1475 | } |
1476 | } |
1477 | |
1478 | HvMAX(hv) = hv_max; |
1479 | HvFILL(hv) = hv_fill; |
8aacddc1 |
1480 | HvTOTALKEYS(hv) = HvTOTALKEYS(ohv); |
b56ba0bf |
1481 | HvARRAY(hv) = ents; |
aec46f14 |
1482 | } /* not magical */ |
b56ba0bf |
1483 | else { |
1484 | /* Iterate over ohv, copying keys and values one at a time. */ |
b3ac6de7 |
1485 | HE *entry; |
bfcb3514 |
1486 | const I32 riter = HvRITER_get(ohv); |
1487 | HE * const eiter = HvEITER_get(ohv); |
b56ba0bf |
1488 | |
1489 | /* Can we use fewer buckets? (hv_max is always 2^n-1) */ |
1490 | while (hv_max && hv_max + 1 >= hv_fill * 2) |
1491 | hv_max = hv_max / 2; |
1492 | HvMAX(hv) = hv_max; |
1493 | |
4a76a316 |
1494 | hv_iterinit(ohv); |
e16e2ff8 |
1495 | while ((entry = hv_iternext_flags(ohv, 0))) { |
19692e8d |
1496 | hv_store_flags(hv, HeKEY(entry), HeKLEN(entry), |
1497 | newSVsv(HeVAL(entry)), HeHASH(entry), |
1498 | HeKFLAGS(entry)); |
b3ac6de7 |
1499 | } |
bfcb3514 |
1500 | HvRITER_set(ohv, riter); |
1501 | HvEITER_set(ohv, eiter); |
b3ac6de7 |
1502 | } |
1c846c1f |
1503 | |
b3ac6de7 |
1504 | return hv; |
1505 | } |
1506 | |
5b9c0671 |
1507 | /* A rather specialised version of newHVhv for copying %^H, ensuring all the |
1508 | magic stays on it. */ |
1509 | HV * |
1510 | Perl_hv_copy_hints_hv(pTHX_ HV *const ohv) |
1511 | { |
1512 | HV * const hv = newHV(); |
1513 | STRLEN hv_fill; |
1514 | |
1515 | if (ohv && (hv_fill = HvFILL(ohv))) { |
1516 | STRLEN hv_max = HvMAX(ohv); |
1517 | HE *entry; |
1518 | const I32 riter = HvRITER_get(ohv); |
1519 | HE * const eiter = HvEITER_get(ohv); |
1520 | |
1521 | while (hv_max && hv_max + 1 >= hv_fill * 2) |
1522 | hv_max = hv_max / 2; |
1523 | HvMAX(hv) = hv_max; |
1524 | |
1525 | hv_iterinit(ohv); |
1526 | while ((entry = hv_iternext_flags(ohv, 0))) { |
1527 | SV *const sv = newSVsv(HeVAL(entry)); |
1528 | sv_magic(sv, NULL, PERL_MAGIC_hintselem, |
1529 | (char *)newSVhek (HeKEY_hek(entry)), HEf_SVKEY); |
1530 | hv_store_flags(hv, HeKEY(entry), HeKLEN(entry), |
1531 | sv, HeHASH(entry), HeKFLAGS(entry)); |
1532 | } |
1533 | HvRITER_set(ohv, riter); |
1534 | HvEITER_set(ohv, eiter); |
1535 | } |
1536 | hv_magic(hv, NULL, PERL_MAGIC_hints); |
1537 | return hv; |
1538 | } |
1539 | |
79072805 |
1540 | void |
864dbfa3 |
1541 | Perl_hv_free_ent(pTHX_ HV *hv, register HE *entry) |
79072805 |
1542 | { |
97aff369 |
1543 | dVAR; |
16bdeea2 |
1544 | SV *val; |
1545 | |
68dc0745 |
1546 | if (!entry) |
79072805 |
1547 | return; |
16bdeea2 |
1548 | val = HeVAL(entry); |
bfcb3514 |
1549 | if (val && isGV(val) && GvCVu(val) && HvNAME_get(hv)) |
3280af22 |
1550 | PL_sub_generation++; /* may be deletion of method from stash */ |
16bdeea2 |
1551 | SvREFCNT_dec(val); |
68dc0745 |
1552 | if (HeKLEN(entry) == HEf_SVKEY) { |
1553 | SvREFCNT_dec(HeKEY_sv(entry)); |
8aacddc1 |
1554 | Safefree(HeKEY_hek(entry)); |
44a8e56a |
1555 | } |
1556 | else if (HvSHAREKEYS(hv)) |
68dc0745 |
1557 | unshare_hek(HeKEY_hek(entry)); |
fde52b5c |
1558 | else |
68dc0745 |
1559 | Safefree(HeKEY_hek(entry)); |
d33b2eba |
1560 | del_HE(entry); |
79072805 |
1561 | } |
1562 | |
1563 | void |
864dbfa3 |
1564 | Perl_hv_delayfree_ent(pTHX_ HV *hv, register HE *entry) |
79072805 |
1565 | { |
97aff369 |
1566 | dVAR; |
68dc0745 |
1567 | if (!entry) |
79072805 |
1568 | return; |
bc4947fc |
1569 | /* SvREFCNT_inc to counter the SvREFCNT_dec in hv_free_ent */ |
1570 | sv_2mortal(SvREFCNT_inc(HeVAL(entry))); /* free between statements */ |
68dc0745 |
1571 | if (HeKLEN(entry) == HEf_SVKEY) { |
bc4947fc |
1572 | sv_2mortal(SvREFCNT_inc(HeKEY_sv(entry))); |
44a8e56a |
1573 | } |
bc4947fc |
1574 | hv_free_ent(hv, entry); |
79072805 |
1575 | } |
1576 | |
954c1994 |
1577 | /* |
1578 | =for apidoc hv_clear |
1579 | |
1580 | Clears a hash, making it empty. |
1581 | |
1582 | =cut |
1583 | */ |
1584 | |
79072805 |
1585 | void |
864dbfa3 |
1586 | Perl_hv_clear(pTHX_ HV *hv) |
79072805 |
1587 | { |
27da23d5 |
1588 | dVAR; |
cbec9347 |
1589 | register XPVHV* xhv; |
79072805 |
1590 | if (!hv) |
1591 | return; |
49293501 |
1592 | |
ecae49c0 |
1593 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
1594 | |
34c3c4e3 |
1595 | xhv = (XPVHV*)SvANY(hv); |
1596 | |
7b2c381c |
1597 | if (SvREADONLY(hv) && HvARRAY(hv) != NULL) { |
34c3c4e3 |
1598 | /* restricted hash: convert all keys to placeholders */ |
b464bac0 |
1599 | STRLEN i; |
1600 | for (i = 0; i <= xhv->xhv_max; i++) { |
7b2c381c |
1601 | HE *entry = (HvARRAY(hv))[i]; |
3a676441 |
1602 | for (; entry; entry = HeNEXT(entry)) { |
1603 | /* not already placeholder */ |
7996736c |
1604 | if (HeVAL(entry) != &PL_sv_placeholder) { |
3a676441 |
1605 | if (HeVAL(entry) && SvREADONLY(HeVAL(entry))) { |
6136c704 |
1606 | SV* const keysv = hv_iterkeysv(entry); |
3a676441 |
1607 | Perl_croak(aTHX_ |
95b63a38 |
1608 | "Attempt to delete readonly key '%"SVf"' from a restricted hash", |
1609 | (void*)keysv); |
3a676441 |
1610 | } |
1611 | SvREFCNT_dec(HeVAL(entry)); |
7996736c |
1612 | HeVAL(entry) = &PL_sv_placeholder; |
ca732855 |
1613 | HvPLACEHOLDERS(hv)++; |
3a676441 |
1614 | } |
34c3c4e3 |
1615 | } |
1616 | } |
df8c6964 |
1617 | goto reset; |
49293501 |
1618 | } |
1619 | |
463ee0b2 |
1620 | hfreeentries(hv); |
ca732855 |
1621 | HvPLACEHOLDERS_set(hv, 0); |
7b2c381c |
1622 | if (HvARRAY(hv)) |
41f62432 |
1623 | Zero(HvARRAY(hv), xhv->xhv_max+1 /* HvMAX(hv)+1 */, HE*); |
a0d0e21e |
1624 | |
1625 | if (SvRMAGICAL(hv)) |
1c846c1f |
1626 | mg_clear((SV*)hv); |
574c8022 |
1627 | |
19692e8d |
1628 | HvHASKFLAGS_off(hv); |
bb443f97 |
1629 | HvREHASH_off(hv); |
df8c6964 |
1630 | reset: |
b79f7545 |
1631 | if (SvOOK(hv)) { |
bfcb3514 |
1632 | HvEITER_set(hv, NULL); |
1633 | } |
79072805 |
1634 | } |
1635 | |
3540d4ce |
1636 | /* |
1637 | =for apidoc hv_clear_placeholders |
1638 | |
1639 | Clears any placeholders from a hash. If a restricted hash has any of its keys |
1640 | marked as readonly and the key is subsequently deleted, the key is not actually |
1641 | deleted but is marked by assigning it a value of &PL_sv_placeholder. This tags |
1642 | it so it will be ignored by future operations such as iterating over the hash, |
4cdaeff7 |
1643 | but will still allow the hash to have a value reassigned to the key at some |
3540d4ce |
1644 | future point. This function clears any such placeholder keys from the hash. |
1645 | See Hash::Util::lock_keys() for an example of its use. |
1646 | |
1647 | =cut |
1648 | */ |
1649 | |
1650 | void |
1651 | Perl_hv_clear_placeholders(pTHX_ HV *hv) |
1652 | { |
27da23d5 |
1653 | dVAR; |
b3ca2e83 |
1654 | const U32 items = (U32)HvPLACEHOLDERS_get(hv); |
1655 | |
1656 | if (items) |
1657 | clear_placeholders(hv, items); |
1658 | } |
1659 | |
1660 | static void |
1661 | S_clear_placeholders(pTHX_ HV *hv, U32 items) |
1662 | { |
1663 | dVAR; |
b464bac0 |
1664 | I32 i; |
d3677389 |
1665 | |
1666 | if (items == 0) |
1667 | return; |
1668 | |
b464bac0 |
1669 | i = HvMAX(hv); |
d3677389 |
1670 | do { |
1671 | /* Loop down the linked list heads */ |
6136c704 |
1672 | bool first = TRUE; |
d3677389 |
1673 | HE **oentry = &(HvARRAY(hv))[i]; |
cf6db12b |
1674 | HE *entry; |
d3677389 |
1675 | |
cf6db12b |
1676 | while ((entry = *oentry)) { |
d3677389 |
1677 | if (HeVAL(entry) == &PL_sv_placeholder) { |
1678 | *oentry = HeNEXT(entry); |
1679 | if (first && !*oentry) |
1680 | HvFILL(hv)--; /* This linked list is now empty. */ |
2e58978b |
1681 | if (entry == HvEITER_get(hv)) |
d3677389 |
1682 | HvLAZYDEL_on(hv); |
1683 | else |
1684 | hv_free_ent(hv, entry); |
1685 | |
1686 | if (--items == 0) { |
1687 | /* Finished. */ |
5d88ecd7 |
1688 | HvTOTALKEYS(hv) -= (IV)HvPLACEHOLDERS_get(hv); |
d3677389 |
1689 | if (HvKEYS(hv) == 0) |
1690 | HvHASKFLAGS_off(hv); |
5d88ecd7 |
1691 | HvPLACEHOLDERS_set(hv, 0); |
d3677389 |
1692 | return; |
1693 | } |
213ce8b3 |
1694 | } else { |
1695 | oentry = &HeNEXT(entry); |
6136c704 |
1696 | first = FALSE; |
d3677389 |
1697 | } |
1698 | } |
1699 | } while (--i >= 0); |
1700 | /* You can't get here, hence assertion should always fail. */ |
1701 | assert (items == 0); |
1702 | assert (0); |
3540d4ce |
1703 | } |
1704 | |
76e3520e |
1705 | STATIC void |
cea2e8a9 |
1706 | S_hfreeentries(pTHX_ HV *hv) |
79072805 |
1707 | { |
23976bdd |
1708 | /* This is the array that we're going to restore */ |
1709 | HE **orig_array; |
1710 | HEK *name; |
1711 | int attempts = 100; |
3abe233e |
1712 | |
a0d0e21e |
1713 | if (!HvARRAY(hv)) |
79072805 |
1714 | return; |
a0d0e21e |
1715 | |
23976bdd |
1716 | if (SvOOK(hv)) { |
1717 | /* If the hash is actually a symbol table with a name, look after the |
1718 | name. */ |
1719 | struct xpvhv_aux *iter = HvAUX(hv); |
1720 | |
1721 | name = iter->xhv_name; |
1722 | iter->xhv_name = NULL; |
1723 | } else { |
1724 | name = NULL; |
1725 | } |
1726 | |
1727 | orig_array = HvARRAY(hv); |
1728 | /* orig_array remains unchanged throughout the loop. If after freeing all |
1729 | the entries it turns out that one of the little blighters has triggered |
1730 | an action that has caused HvARRAY to be re-allocated, then we set |
1731 | array to the new HvARRAY, and try again. */ |
1732 | |
1733 | while (1) { |
1734 | /* This is the one we're going to try to empty. First time round |
1735 | it's the original array. (Hopefully there will only be 1 time |
1736 | round) */ |
6136c704 |
1737 | HE ** const array = HvARRAY(hv); |
7440661e |
1738 | I32 i = HvMAX(hv); |
23976bdd |
1739 | |
1740 | /* Because we have taken xhv_name out, the only allocated pointer |
1741 | in the aux structure that might exist is the backreference array. |
1742 | */ |
1743 | |
1744 | if (SvOOK(hv)) { |
7440661e |
1745 | HE *entry; |
23976bdd |
1746 | struct xpvhv_aux *iter = HvAUX(hv); |
1747 | /* If there are weak references to this HV, we need to avoid |
1748 | freeing them up here. In particular we need to keep the AV |
1749 | visible as what we're deleting might well have weak references |
1750 | back to this HV, so the for loop below may well trigger |
1751 | the removal of backreferences from this array. */ |
1752 | |
1753 | if (iter->xhv_backreferences) { |
1754 | /* So donate them to regular backref magic to keep them safe. |
1755 | The sv_magic will increase the reference count of the AV, |
1756 | so we need to drop it first. */ |
5b285ea4 |
1757 | SvREFCNT_dec(iter->xhv_backreferences); |
23976bdd |
1758 | if (AvFILLp(iter->xhv_backreferences) == -1) { |
1759 | /* Turns out that the array is empty. Just free it. */ |
1760 | SvREFCNT_dec(iter->xhv_backreferences); |
1b8791d1 |
1761 | |
23976bdd |
1762 | } else { |
1763 | sv_magic((SV*)hv, (SV*)iter->xhv_backreferences, |
1764 | PERL_MAGIC_backref, NULL, 0); |
1765 | } |
1766 | iter->xhv_backreferences = NULL; |
5b285ea4 |
1767 | } |
86f55936 |
1768 | |
23976bdd |
1769 | entry = iter->xhv_eiter; /* HvEITER(hv) */ |
1770 | if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
1771 | HvLAZYDEL_off(hv); |
1772 | hv_free_ent(hv, entry); |
1773 | } |
1774 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
4608196e |
1775 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
b79f7545 |
1776 | |
23976bdd |
1777 | /* There are now no allocated pointers in the aux structure. */ |
2f86008e |
1778 | |
23976bdd |
1779 | SvFLAGS(hv) &= ~SVf_OOK; /* Goodbye, aux structure. */ |
1780 | /* What aux structure? */ |
a0d0e21e |
1781 | } |
bfcb3514 |
1782 | |
23976bdd |
1783 | /* make everyone else think the array is empty, so that the destructors |
1784 | * called for freed entries can't recusively mess with us */ |
1785 | HvARRAY(hv) = NULL; |
1786 | HvFILL(hv) = 0; |
1787 | ((XPVHV*) SvANY(hv))->xhv_keys = 0; |
1788 | |
7440661e |
1789 | |
1790 | do { |
1791 | /* Loop down the linked list heads */ |
1792 | HE *entry = array[i]; |
1793 | |
1794 | while (entry) { |
23976bdd |
1795 | register HE * const oentry = entry; |
1796 | entry = HeNEXT(entry); |
1797 | hv_free_ent(hv, oentry); |
1798 | } |
7440661e |
1799 | } while (--i >= 0); |
b79f7545 |
1800 | |
23976bdd |
1801 | /* As there are no allocated pointers in the aux structure, it's now |
1802 | safe to free the array we just cleaned up, if it's not the one we're |
1803 | going to put back. */ |
1804 | if (array != orig_array) { |
1805 | Safefree(array); |
1806 | } |
b79f7545 |
1807 | |
23976bdd |
1808 | if (!HvARRAY(hv)) { |
1809 | /* Good. No-one added anything this time round. */ |
1810 | break; |
bfcb3514 |
1811 | } |
b79f7545 |
1812 | |
23976bdd |
1813 | if (SvOOK(hv)) { |
1814 | /* Someone attempted to iterate or set the hash name while we had |
1815 | the array set to 0. We'll catch backferences on the next time |
1816 | round the while loop. */ |
1817 | assert(HvARRAY(hv)); |
1b8791d1 |
1818 | |
23976bdd |
1819 | if (HvAUX(hv)->xhv_name) { |
1820 | unshare_hek_or_pvn(HvAUX(hv)->xhv_name, 0, 0, 0); |
1821 | } |
1822 | } |
1823 | |
1824 | if (--attempts == 0) { |
1825 | Perl_die(aTHX_ "panic: hfreeentries failed to free hash - something is repeatedly re-creating entries"); |
1826 | } |
6136c704 |
1827 | } |
23976bdd |
1828 | |
1829 | HvARRAY(hv) = orig_array; |
1830 | |
1831 | /* If the hash was actually a symbol table, put the name back. */ |
1832 | if (name) { |
1833 | /* We have restored the original array. If name is non-NULL, then |
1834 | the original array had an aux structure at the end. So this is |
1835 | valid: */ |
1836 | SvFLAGS(hv) |= SVf_OOK; |
1837 | HvAUX(hv)->xhv_name = name; |
1b8791d1 |
1838 | } |
79072805 |
1839 | } |
1840 | |
954c1994 |
1841 | /* |
1842 | =for apidoc hv_undef |
1843 | |
1844 | Undefines the hash. |
1845 | |
1846 | =cut |
1847 | */ |
1848 | |
79072805 |
1849 | void |
864dbfa3 |
1850 | Perl_hv_undef(pTHX_ HV *hv) |
79072805 |
1851 | { |
97aff369 |
1852 | dVAR; |
cbec9347 |
1853 | register XPVHV* xhv; |
bfcb3514 |
1854 | const char *name; |
86f55936 |
1855 | |
79072805 |
1856 | if (!hv) |
1857 | return; |
ecae49c0 |
1858 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
cbec9347 |
1859 | xhv = (XPVHV*)SvANY(hv); |
463ee0b2 |
1860 | hfreeentries(hv); |
bfcb3514 |
1861 | if ((name = HvNAME_get(hv))) { |
7e8961ec |
1862 | if(PL_stashcache) |
7423f6db |
1863 | hv_delete(PL_stashcache, name, HvNAMELEN_get(hv), G_DISCARD); |
bd61b366 |
1864 | hv_name_set(hv, NULL, 0, 0); |
85e6fe83 |
1865 | } |
b79f7545 |
1866 | SvFLAGS(hv) &= ~SVf_OOK; |
1867 | Safefree(HvARRAY(hv)); |
cbec9347 |
1868 | xhv->xhv_max = 7; /* HvMAX(hv) = 7 (it's a normal hash) */ |
7b2c381c |
1869 | HvARRAY(hv) = 0; |
ca732855 |
1870 | HvPLACEHOLDERS_set(hv, 0); |
a0d0e21e |
1871 | |
1872 | if (SvRMAGICAL(hv)) |
1c846c1f |
1873 | mg_clear((SV*)hv); |
79072805 |
1874 | } |
1875 | |
b464bac0 |
1876 | static struct xpvhv_aux* |
5f66b61c |
1877 | S_hv_auxinit(HV *hv) { |
bfcb3514 |
1878 | struct xpvhv_aux *iter; |
b79f7545 |
1879 | char *array; |
bfcb3514 |
1880 | |
b79f7545 |
1881 | if (!HvARRAY(hv)) { |
a02a5408 |
1882 | Newxz(array, PERL_HV_ARRAY_ALLOC_BYTES(HvMAX(hv) + 1) |
b79f7545 |
1883 | + sizeof(struct xpvhv_aux), char); |
1884 | } else { |
1885 | array = (char *) HvARRAY(hv); |
1886 | Renew(array, PERL_HV_ARRAY_ALLOC_BYTES(HvMAX(hv) + 1) |
1887 | + sizeof(struct xpvhv_aux), char); |
1888 | } |
1889 | HvARRAY(hv) = (HE**) array; |
1890 | /* SvOOK_on(hv) attacks the IV flags. */ |
1891 | SvFLAGS(hv) |= SVf_OOK; |
1892 | iter = HvAUX(hv); |
bfcb3514 |
1893 | |
1894 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
4608196e |
1895 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
bfcb3514 |
1896 | iter->xhv_name = 0; |
86f55936 |
1897 | iter->xhv_backreferences = 0; |
bfcb3514 |
1898 | return iter; |
1899 | } |
1900 | |
954c1994 |
1901 | /* |
1902 | =for apidoc hv_iterinit |
1903 | |
1904 | Prepares a starting point to traverse a hash table. Returns the number of |
1905 | keys in the hash (i.e. the same as C<HvKEYS(tb)>). The return value is |
1c846c1f |
1906 | currently only meaningful for hashes without tie magic. |
954c1994 |
1907 | |
1908 | NOTE: Before version 5.004_65, C<hv_iterinit> used to return the number of |
1909 | hash buckets that happen to be in use. If you still need that esoteric |
1910 | value, you can get it through the macro C<HvFILL(tb)>. |
1911 | |
e16e2ff8 |
1912 | |
954c1994 |
1913 | =cut |
1914 | */ |
1915 | |
79072805 |
1916 | I32 |
864dbfa3 |
1917 | Perl_hv_iterinit(pTHX_ HV *hv) |
79072805 |
1918 | { |
aa689395 |
1919 | if (!hv) |
cea2e8a9 |
1920 | Perl_croak(aTHX_ "Bad hash"); |
bfcb3514 |
1921 | |
b79f7545 |
1922 | if (SvOOK(hv)) { |
6136c704 |
1923 | struct xpvhv_aux * const iter = HvAUX(hv); |
0bd48802 |
1924 | HE * const entry = iter->xhv_eiter; /* HvEITER(hv) */ |
bfcb3514 |
1925 | if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
1926 | HvLAZYDEL_off(hv); |
1927 | hv_free_ent(hv, entry); |
1928 | } |
1929 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
4608196e |
1930 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
bfcb3514 |
1931 | } else { |
6136c704 |
1932 | hv_auxinit(hv); |
72940dca |
1933 | } |
e62cc96a |
1934 | if ( SvRMAGICAL(hv) ) { |
81714fb9 |
1935 | MAGIC *mg = mg_find((SV*)hv, PERL_MAGIC_regdata_names); |
1936 | if ( mg ) { |
1937 | if (PL_curpm) { |
1938 | const REGEXP * const rx = PM_GETRE(PL_curpm); |
1939 | if (rx && rx->paren_names) { |
1940 | (void)hv_iterinit(rx->paren_names); |
1941 | } |
1942 | } |
1943 | } |
1944 | } |
cbec9347 |
1945 | /* used to be xhv->xhv_fill before 5.004_65 */ |
5d88ecd7 |
1946 | return HvTOTALKEYS(hv); |
79072805 |
1947 | } |
bfcb3514 |
1948 | |
1949 | I32 * |
1950 | Perl_hv_riter_p(pTHX_ HV *hv) { |
1951 | struct xpvhv_aux *iter; |
1952 | |
1953 | if (!hv) |
1954 | Perl_croak(aTHX_ "Bad hash"); |
1955 | |
6136c704 |
1956 | iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
bfcb3514 |
1957 | return &(iter->xhv_riter); |
1958 | } |
1959 | |
1960 | HE ** |
1961 | Perl_hv_eiter_p(pTHX_ HV *hv) { |
1962 | struct xpvhv_aux *iter; |
1963 | |
1964 | if (!hv) |
1965 | Perl_croak(aTHX_ "Bad hash"); |
1966 | |
6136c704 |
1967 | iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
bfcb3514 |
1968 | return &(iter->xhv_eiter); |
1969 | } |
1970 | |
1971 | void |
1972 | Perl_hv_riter_set(pTHX_ HV *hv, I32 riter) { |
1973 | struct xpvhv_aux *iter; |
1974 | |
1975 | if (!hv) |
1976 | Perl_croak(aTHX_ "Bad hash"); |
1977 | |
b79f7545 |
1978 | if (SvOOK(hv)) { |
1979 | iter = HvAUX(hv); |
1980 | } else { |
bfcb3514 |
1981 | if (riter == -1) |
1982 | return; |
1983 | |
6136c704 |
1984 | iter = hv_auxinit(hv); |
bfcb3514 |
1985 | } |
1986 | iter->xhv_riter = riter; |
1987 | } |
1988 | |
1989 | void |
1990 | Perl_hv_eiter_set(pTHX_ HV *hv, HE *eiter) { |
1991 | struct xpvhv_aux *iter; |
1992 | |
1993 | if (!hv) |
1994 | Perl_croak(aTHX_ "Bad hash"); |
1995 | |
b79f7545 |
1996 | if (SvOOK(hv)) { |
1997 | iter = HvAUX(hv); |
1998 | } else { |
bfcb3514 |
1999 | /* 0 is the default so don't go malloc()ing a new structure just to |
2000 | hold 0. */ |
2001 | if (!eiter) |
2002 | return; |
2003 | |
6136c704 |
2004 | iter = hv_auxinit(hv); |
bfcb3514 |
2005 | } |
2006 | iter->xhv_eiter = eiter; |
2007 | } |
2008 | |
bfcb3514 |
2009 | void |
4164be69 |
2010 | Perl_hv_name_set(pTHX_ HV *hv, const char *name, U32 len, U32 flags) |
bfcb3514 |
2011 | { |
97aff369 |
2012 | dVAR; |
b79f7545 |
2013 | struct xpvhv_aux *iter; |
7423f6db |
2014 | U32 hash; |
46c461b5 |
2015 | |
2016 | PERL_UNUSED_ARG(flags); |
bfcb3514 |
2017 | |
4164be69 |
2018 | if (len > I32_MAX) |
2019 | Perl_croak(aTHX_ "panic: hv name too long (%"UVuf")", (UV) len); |
2020 | |
b79f7545 |
2021 | if (SvOOK(hv)) { |
2022 | iter = HvAUX(hv); |
7423f6db |
2023 | if (iter->xhv_name) { |
2024 | unshare_hek_or_pvn(iter->xhv_name, 0, 0, 0); |
2025 | } |
16580ff5 |
2026 | } else { |
bfcb3514 |
2027 | if (name == 0) |
2028 | return; |
2029 | |
6136c704 |
2030 | iter = hv_auxinit(hv); |
bfcb3514 |
2031 | } |
7423f6db |
2032 | PERL_HASH(hash, name, len); |
2033 | iter->xhv_name = name ? share_hek(name, len, hash) : 0; |
bfcb3514 |
2034 | } |
2035 | |
86f55936 |
2036 | AV ** |
2037 | Perl_hv_backreferences_p(pTHX_ HV *hv) { |
6136c704 |
2038 | struct xpvhv_aux * const iter = SvOOK(hv) ? HvAUX(hv) : hv_auxinit(hv); |
96a5add6 |
2039 | PERL_UNUSED_CONTEXT; |
86f55936 |
2040 | return &(iter->xhv_backreferences); |
2041 | } |
2042 | |
2043 | void |
2044 | Perl_hv_kill_backrefs(pTHX_ HV *hv) { |
2045 | AV *av; |
2046 | |
2047 | if (!SvOOK(hv)) |
2048 | return; |
2049 | |
2050 | av = HvAUX(hv)->xhv_backreferences; |
2051 | |
2052 | if (av) { |
2053 | HvAUX(hv)->xhv_backreferences = 0; |
2054 | Perl_sv_kill_backrefs(aTHX_ (SV*) hv, av); |
2055 | } |
2056 | } |
2057 | |
954c1994 |
2058 | /* |
7a7b9979 |
2059 | hv_iternext is implemented as a macro in hv.h |
2060 | |
954c1994 |
2061 | =for apidoc hv_iternext |
2062 | |
2063 | Returns entries from a hash iterator. See C<hv_iterinit>. |
2064 | |
fe7bca90 |
2065 | You may call C<hv_delete> or C<hv_delete_ent> on the hash entry that the |
2066 | iterator currently points to, without losing your place or invalidating your |
2067 | iterator. Note that in this case the current entry is deleted from the hash |
2068 | with your iterator holding the last reference to it. Your iterator is flagged |
2069 | to free the entry on the next call to C<hv_iternext>, so you must not discard |
2070 | your iterator immediately else the entry will leak - call C<hv_iternext> to |
2071 | trigger the resource deallocation. |
2072 | |
fe7bca90 |
2073 | =for apidoc hv_iternext_flags |
2074 | |
2075 | Returns entries from a hash iterator. See C<hv_iterinit> and C<hv_iternext>. |
2076 | The C<flags> value will normally be zero; if HV_ITERNEXT_WANTPLACEHOLDERS is |
2077 | set the placeholders keys (for restricted hashes) will be returned in addition |
2078 | to normal keys. By default placeholders are automatically skipped over. |
7996736c |
2079 | Currently a placeholder is implemented with a value that is |
2080 | C<&Perl_sv_placeholder>. Note that the implementation of placeholders and |
fe7bca90 |
2081 | restricted hashes may change, and the implementation currently is |
2082 | insufficiently abstracted for any change to be tidy. |
e16e2ff8 |
2083 | |
fe7bca90 |
2084 | =cut |
e16e2ff8 |
2085 | */ |
2086 | |
2087 | HE * |
2088 | Perl_hv_iternext_flags(pTHX_ HV *hv, I32 flags) |
2089 | { |
27da23d5 |
2090 | dVAR; |
cbec9347 |
2091 | register XPVHV* xhv; |
79072805 |
2092 | register HE *entry; |
a0d0e21e |
2093 | HE *oldentry; |
463ee0b2 |
2094 | MAGIC* mg; |
bfcb3514 |
2095 | struct xpvhv_aux *iter; |
79072805 |
2096 | |
2097 | if (!hv) |
cea2e8a9 |
2098 | Perl_croak(aTHX_ "Bad hash"); |
81714fb9 |
2099 | |
cbec9347 |
2100 | xhv = (XPVHV*)SvANY(hv); |
bfcb3514 |
2101 | |
b79f7545 |
2102 | if (!SvOOK(hv)) { |
bfcb3514 |
2103 | /* Too many things (well, pp_each at least) merrily assume that you can |
2104 | call iv_iternext without calling hv_iterinit, so we'll have to deal |
2105 | with it. */ |
2106 | hv_iterinit(hv); |
bfcb3514 |
2107 | } |
b79f7545 |
2108 | iter = HvAUX(hv); |
bfcb3514 |
2109 | |
2110 | oldentry = entry = iter->xhv_eiter; /* HvEITER(hv) */ |
e62cc96a |
2111 | if (SvMAGICAL(hv) && SvRMAGICAL(hv)) { |
2112 | if ( ( mg = mg_find((SV*)hv, PERL_MAGIC_regdata_names) ) ) { |
2113 | SV * key; |
2114 | SV *val = NULL; |
2115 | REGEXP * rx; |
2116 | if (!PL_curpm) |
2117 | return NULL; |
2118 | rx = PM_GETRE(PL_curpm); |
2119 | if (rx && rx->paren_names) { |
2120 | hv = rx->paren_names; |
2121 | } else { |
2122 | return NULL; |
2123 | } |
463ee0b2 |
2124 | |
e62cc96a |
2125 | key = sv_newmortal(); |
2126 | if (entry) { |
2127 | sv_setsv(key, HeSVKEY_force(entry)); |
2128 | SvREFCNT_dec(HeSVKEY(entry)); /* get rid of previous key */ |
2129 | } |
2130 | else { |
2131 | char *k; |
2132 | HEK *hek; |
2133 | |
2134 | /* one HE per MAGICAL hash */ |
2135 | iter->xhv_eiter = entry = new_HE(); /* HvEITER(hv) = new_HE() */ |
2136 | Zero(entry, 1, HE); |
2137 | Newxz(k, HEK_BASESIZE + sizeof(SV*), char); |
2138 | hek = (HEK*)k; |
2139 | HeKEY_hek(entry) = hek; |
2140 | HeKLEN(entry) = HEf_SVKEY; |
2141 | } |
2142 | { |
2143 | while (!val) { |
2144 | HE *temphe = hv_iternext_flags(hv,flags); |
2145 | if (temphe) { |
2146 | IV i; |
2147 | IV parno = 0; |
2148 | SV* sv_dat = HeVAL(temphe); |
2149 | I32 *nums = (I32*)SvPVX(sv_dat); |
2150 | for ( i = 0; i < SvIVX(sv_dat); i++ ) { |
2151 | if ((I32)(rx->lastcloseparen) >= nums[i] && |
2152 | rx->startp[nums[i]] != -1 && |
2153 | rx->endp[nums[i]] != -1) |
2154 | { |
2155 | parno = nums[i]; |
2156 | break; |
2157 | } |
2158 | } |
2159 | if (parno) { |
2160 | GV *gv_paren; |
2161 | STRLEN len; |
2162 | SV *sv = sv_newmortal(); |
2163 | const char* pvkey = HePV(temphe, len); |
2164 | |
2165 | Perl_sv_setpvf(aTHX_ sv, "%"IVdf,(IV)parno); |
2166 | gv_paren = Perl_gv_fetchsv(aTHX_ sv, GV_ADD, SVt_PVGV); |
2167 | Perl_sv_setpvn(aTHX_ key, pvkey, len); |
2168 | val = GvSVn(gv_paren); |
81714fb9 |
2169 | } |
e62cc96a |
2170 | } else { |
2171 | break; |
81714fb9 |
2172 | } |
81714fb9 |
2173 | } |
2174 | } |
e62cc96a |
2175 | if (val && SvOK(key)) { |
2176 | /* force key to stay around until next time */ |
2177 | HeSVKEY_set(entry, SvREFCNT_inc_simple_NN(key)); |
2178 | HeVAL(entry) = SvREFCNT_inc_simple_NN(val); |
2179 | return entry; /* beware, hent_val is not set */ |
2180 | } |
2181 | if (HeVAL(entry)) |
2182 | SvREFCNT_dec(HeVAL(entry)); |
2183 | Safefree(HeKEY_hek(entry)); |
2184 | del_HE(entry); |
2185 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
2186 | return NULL; |
81714fb9 |
2187 | } |
e62cc96a |
2188 | else if ( ( mg = mg_find((SV*)hv, PERL_MAGIC_tied) ) ) { |
2189 | SV * const key = sv_newmortal(); |
2190 | if (entry) { |
2191 | sv_setsv(key, HeSVKEY_force(entry)); |
2192 | SvREFCNT_dec(HeSVKEY(entry)); /* get rid of previous key */ |
2193 | } |
2194 | else { |
2195 | char *k; |
2196 | HEK *hek; |
2197 | |
2198 | /* one HE per MAGICAL hash */ |
2199 | iter->xhv_eiter = entry = new_HE(); /* HvEITER(hv) = new_HE() */ |
2200 | Zero(entry, 1, HE); |
2201 | Newxz(k, HEK_BASESIZE + sizeof(SV*), char); |
2202 | hek = (HEK*)k; |
2203 | HeKEY_hek(entry) = hek; |
2204 | HeKLEN(entry) = HEf_SVKEY; |
2205 | } |
2206 | magic_nextpack((SV*) hv,mg,key); |
2207 | if (SvOK(key)) { |
2208 | /* force key to stay around until next time */ |
2209 | HeSVKEY_set(entry, SvREFCNT_inc_simple_NN(key)); |
2210 | return entry; /* beware, hent_val is not set */ |
2211 | } |
2212 | if (HeVAL(entry)) |
2213 | SvREFCNT_dec(HeVAL(entry)); |
2214 | Safefree(HeKEY_hek(entry)); |
2215 | del_HE(entry); |
2216 | iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */ |
2217 | return NULL; |
81714fb9 |
2218 | } |
79072805 |
2219 | } |
7ee146b1 |
2220 | #if defined(DYNAMIC_ENV_FETCH) && !defined(__riscos__) /* set up %ENV for iteration */ |
03026e68 |
2221 | if (!entry && SvRMAGICAL((SV*)hv) && mg_find((SV*)hv, PERL_MAGIC_env)) { |
f675dbe5 |
2222 | prime_env_iter(); |
03026e68 |
2223 | #ifdef VMS |
2224 | /* The prime_env_iter() on VMS just loaded up new hash values |
2225 | * so the iteration count needs to be reset back to the beginning |
2226 | */ |
2227 | hv_iterinit(hv); |
2228 | iter = HvAUX(hv); |
2229 | oldentry = entry = iter->xhv_eiter; /* HvEITER(hv) */ |
2230 | #endif |
2231 | } |
f675dbe5 |
2232 | #endif |
463ee0b2 |
2233 | |
b79f7545 |
2234 | /* hv_iterint now ensures this. */ |
2235 | assert (HvARRAY(hv)); |
2236 | |
015a5f36 |
2237 | /* At start of hash, entry is NULL. */ |
fde52b5c |
2238 | if (entry) |
8aacddc1 |
2239 | { |
fde52b5c |
2240 | entry = HeNEXT(entry); |
e16e2ff8 |
2241 | if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) { |
2242 | /* |
2243 | * Skip past any placeholders -- don't want to include them in |
2244 | * any iteration. |
2245 | */ |
7996736c |
2246 | while (entry && HeVAL(entry) == &PL_sv_placeholder) { |
e16e2ff8 |
2247 | entry = HeNEXT(entry); |
2248 | } |
8aacddc1 |
2249 | } |
2250 | } |
fde52b5c |
2251 | while (!entry) { |
015a5f36 |
2252 | /* OK. Come to the end of the current list. Grab the next one. */ |
2253 | |
bfcb3514 |
2254 | iter->xhv_riter++; /* HvRITER(hv)++ */ |
2255 | if (iter->xhv_riter > (I32)xhv->xhv_max /* HvRITER(hv) > HvMAX(hv) */) { |
015a5f36 |
2256 | /* There is no next one. End of the hash. */ |
bfcb3514 |
2257 | iter->xhv_riter = -1; /* HvRITER(hv) = -1 */ |
fde52b5c |
2258 | break; |
79072805 |
2259 | } |
7b2c381c |
2260 | entry = (HvARRAY(hv))[iter->xhv_riter]; |
8aacddc1 |
2261 | |
e16e2ff8 |
2262 | if (!(flags & HV_ITERNEXT_WANTPLACEHOLDERS)) { |
015a5f36 |
2263 | /* If we have an entry, but it's a placeholder, don't count it. |
2264 | Try the next. */ |
7996736c |
2265 | while (entry && HeVAL(entry) == &PL_sv_placeholder) |
015a5f36 |
2266 | entry = HeNEXT(entry); |
2267 | } |
2268 | /* Will loop again if this linked list starts NULL |
2269 | (for HV_ITERNEXT_WANTPLACEHOLDERS) |
2270 | or if we run through it and find only placeholders. */ |
fde52b5c |
2271 | } |
79072805 |
2272 | |
72940dca |
2273 | if (oldentry && HvLAZYDEL(hv)) { /* was deleted earlier? */ |
2274 | HvLAZYDEL_off(hv); |
68dc0745 |
2275 | hv_free_ent(hv, oldentry); |
72940dca |
2276 | } |
a0d0e21e |
2277 | |
fdcd69b6 |
2278 | /*if (HvREHASH(hv) && entry && !HeKREHASH(entry)) |
2279 | PerlIO_printf(PerlIO_stderr(), "Awooga %p %p\n", hv, entry);*/ |
2280 | |
bfcb3514 |
2281 | iter->xhv_eiter = entry; /* HvEITER(hv) = entry */ |
79072805 |
2282 | return entry; |
2283 | } |
2284 | |
954c1994 |
2285 | /* |
2286 | =for apidoc hv_iterkey |
2287 | |
2288 | Returns the key from the current position of the hash iterator. See |
2289 | C<hv_iterinit>. |
2290 | |
2291 | =cut |
2292 | */ |
2293 | |
79072805 |
2294 | char * |
864dbfa3 |
2295 | Perl_hv_iterkey(pTHX_ register HE *entry, I32 *retlen) |
79072805 |
2296 | { |
fde52b5c |
2297 | if (HeKLEN(entry) == HEf_SVKEY) { |
fb73857a |
2298 | STRLEN len; |
0bd48802 |
2299 | char * const p = SvPV(HeKEY_sv(entry), len); |
fb73857a |
2300 | *retlen = len; |
2301 | return p; |
fde52b5c |
2302 | } |
2303 | else { |
2304 | *retlen = HeKLEN(entry); |
2305 | return HeKEY(entry); |
2306 | } |
2307 | } |
2308 | |
2309 | /* unlike hv_iterval(), this always returns a mortal copy of the key */ |
954c1994 |
2310 | /* |
2311 | =for apidoc hv_iterkeysv |
2312 | |
2313 | Returns the key as an C<SV*> from the current position of the hash |
2314 | iterator. The return value will always be a mortal copy of the key. Also |
2315 | see C<hv_iterinit>. |
2316 | |
2317 | =cut |
2318 | */ |
2319 | |
fde52b5c |
2320 | SV * |
864dbfa3 |
2321 | Perl_hv_iterkeysv(pTHX_ register HE *entry) |
fde52b5c |
2322 | { |
c1b02ed8 |
2323 | return sv_2mortal(newSVhek(HeKEY_hek(entry))); |
79072805 |
2324 | } |
2325 | |
954c1994 |
2326 | /* |
2327 | =for apidoc hv_iterval |
2328 | |
2329 | Returns the value from the current position of the hash iterator. See |
2330 | C<hv_iterkey>. |
2331 | |
2332 | =cut |
2333 | */ |
2334 | |
79072805 |
2335 | SV * |
864dbfa3 |
2336 | Perl_hv_iterval(pTHX_ HV *hv, register HE *entry) |
79072805 |
2337 | { |
8990e307 |
2338 | if (SvRMAGICAL(hv)) { |
14befaf4 |
2339 | if (mg_find((SV*)hv, PERL_MAGIC_tied)) { |
c4420975 |
2340 | SV* const sv = sv_newmortal(); |
bbce6d69 |
2341 | if (HeKLEN(entry) == HEf_SVKEY) |
2342 | mg_copy((SV*)hv, sv, (char*)HeKEY_sv(entry), HEf_SVKEY); |
a3b680e6 |
2343 | else |
2344 | mg_copy((SV*)hv, sv, HeKEY(entry), HeKLEN(entry)); |
463ee0b2 |
2345 | return sv; |
2346 | } |
79072805 |
2347 | } |
fde52b5c |
2348 | return HeVAL(entry); |
79072805 |
2349 | } |
2350 | |
954c1994 |
2351 | /* |
2352 | =for apidoc hv_iternextsv |
2353 | |
2354 | Performs an C<hv_iternext>, C<hv_iterkey>, and C<hv_iterval> in one |
2355 | operation. |
2356 | |
2357 | =cut |
2358 | */ |
2359 | |
a0d0e21e |
2360 | SV * |
864dbfa3 |
2361 | Perl_hv_iternextsv(pTHX_ HV *hv, char **key, I32 *retlen) |
a0d0e21e |
2362 | { |
0bd48802 |
2363 | HE * const he = hv_iternext_flags(hv, 0); |
2364 | |
2365 | if (!he) |
a0d0e21e |
2366 | return NULL; |
2367 | *key = hv_iterkey(he, retlen); |
2368 | return hv_iterval(hv, he); |
2369 | } |
2370 | |
954c1994 |
2371 | /* |
bc5cdc23 |
2372 | |
2373 | Now a macro in hv.h |
2374 | |
954c1994 |
2375 | =for apidoc hv_magic |
2376 | |
2377 | Adds magic to a hash. See C<sv_magic>. |
2378 | |
2379 | =cut |
2380 | */ |
2381 | |
bbce6d69 |
2382 | /* possibly free a shared string if no one has access to it |
fde52b5c |
2383 | * len and hash must both be valid for str. |
2384 | */ |
bbce6d69 |
2385 | void |
864dbfa3 |
2386 | Perl_unsharepvn(pTHX_ const char *str, I32 len, U32 hash) |
fde52b5c |
2387 | { |
19692e8d |
2388 | unshare_hek_or_pvn (NULL, str, len, hash); |
2389 | } |
2390 | |
2391 | |
2392 | void |
2393 | Perl_unshare_hek(pTHX_ HEK *hek) |
2394 | { |
2395 | unshare_hek_or_pvn(hek, NULL, 0, 0); |
2396 | } |
2397 | |
2398 | /* possibly free a shared string if no one has access to it |
2399 | hek if non-NULL takes priority over the other 3, else str, len and hash |
2400 | are used. If so, len and hash must both be valid for str. |
2401 | */ |
df132699 |
2402 | STATIC void |
97ddebaf |
2403 | S_unshare_hek_or_pvn(pTHX_ const HEK *hek, const char *str, I32 len, U32 hash) |
19692e8d |
2404 | { |
97aff369 |
2405 | dVAR; |
cbec9347 |
2406 | register XPVHV* xhv; |
20454177 |
2407 | HE *entry; |
fde52b5c |
2408 | register HE **oentry; |
45d1cc86 |
2409 | HE **first; |
c3654f1a |
2410 | bool is_utf8 = FALSE; |
19692e8d |
2411 | int k_flags = 0; |
aec46f14 |
2412 | const char * const save = str; |
cbbf8932 |
2413 | struct shared_he *he = NULL; |
c3654f1a |
2414 | |
19692e8d |
2415 | if (hek) { |
cbae3960 |
2416 | /* Find the shared he which is just before us in memory. */ |
2417 | he = (struct shared_he *)(((char *)hek) |
2418 | - STRUCT_OFFSET(struct shared_he, |
2419 | shared_he_hek)); |
2420 | |
2421 | /* Assert that the caller passed us a genuine (or at least consistent) |
2422 | shared hek */ |
2423 | assert (he->shared_he_he.hent_hek == hek); |
29404ae0 |
2424 | |
2425 | LOCK_STRTAB_MUTEX; |
de616631 |
2426 | if (he->shared_he_he.he_valu.hent_refcount - 1) { |
2427 | --he->shared_he_he.he_valu.hent_refcount; |
29404ae0 |
2428 | UNLOCK_STRTAB_MUTEX; |
2429 | return; |
2430 | } |
2431 | UNLOCK_STRTAB_MUTEX; |
2432 | |
19692e8d |
2433 | hash = HEK_HASH(hek); |
2434 | } else if (len < 0) { |
2435 | STRLEN tmplen = -len; |
2436 | is_utf8 = TRUE; |
2437 | /* See the note in hv_fetch(). --jhi */ |
2438 | str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8); |
2439 | len = tmplen; |
2440 | if (is_utf8) |
2441 | k_flags = HVhek_UTF8; |
2442 | if (str != save) |
2443 | k_flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
c3654f1a |
2444 | } |
1c846c1f |
2445 | |
de616631 |
2446 | /* what follows was the moral equivalent of: |
6b88bc9c |
2447 | if ((Svp = hv_fetch(PL_strtab, tmpsv, FALSE, hash))) { |
a0714e2c |
2448 | if (--*Svp == NULL) |
6b88bc9c |
2449 | hv_delete(PL_strtab, str, len, G_DISCARD, hash); |
bbce6d69 |
2450 | } */ |
cbec9347 |
2451 | xhv = (XPVHV*)SvANY(PL_strtab); |
fde52b5c |
2452 | /* assert(xhv_array != 0) */ |
5f08fbcd |
2453 | LOCK_STRTAB_MUTEX; |
45d1cc86 |
2454 | first = oentry = &(HvARRAY(PL_strtab))[hash & (I32) HvMAX(PL_strtab)]; |
6c1b96a1 |
2455 | if (he) { |
2456 | const HE *const he_he = &(he->shared_he_he); |
45d1cc86 |
2457 | for (entry = *oentry; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
35ab5632 |
2458 | if (entry == he_he) |
2459 | break; |
19692e8d |
2460 | } |
2461 | } else { |
35a4481c |
2462 | const int flags_masked = k_flags & HVhek_MASK; |
45d1cc86 |
2463 | for (entry = *oentry; entry; oentry = &HeNEXT(entry), entry = *oentry) { |
19692e8d |
2464 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
2465 | continue; |
2466 | if (HeKLEN(entry) != len) |
2467 | continue; |
2468 | if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */ |
2469 | continue; |
2470 | if (HeKFLAGS(entry) != flags_masked) |
2471 | continue; |
19692e8d |
2472 | break; |
2473 | } |
2474 | } |
2475 | |
35ab5632 |
2476 | if (entry) { |
2477 | if (--entry->he_valu.hent_refcount == 0) { |
19692e8d |
2478 | *oentry = HeNEXT(entry); |
45d1cc86 |
2479 | if (!*first) { |
2480 | /* There are now no entries in our slot. */ |
19692e8d |
2481 | xhv->xhv_fill--; /* HvFILL(hv)-- */ |
45d1cc86 |
2482 | } |
cbae3960 |
2483 | Safefree(entry); |
4c7185a0 |
2484 | xhv->xhv_keys--; /* HvTOTALKEYS(hv)-- */ |
19692e8d |
2485 | } |
fde52b5c |
2486 | } |
19692e8d |
2487 | |
333f433b |
2488 | UNLOCK_STRTAB_MUTEX; |
35ab5632 |
2489 | if (!entry && ckWARN_d(WARN_INTERNAL)) |
19692e8d |
2490 | Perl_warner(aTHX_ packWARN(WARN_INTERNAL), |
472d47bc |
2491 | "Attempt to free non-existent shared string '%s'%s" |
2492 | pTHX__FORMAT, |
19692e8d |
2493 | hek ? HEK_KEY(hek) : str, |
472d47bc |
2494 | ((k_flags & HVhek_UTF8) ? " (utf8)" : "") pTHX__VALUE); |
19692e8d |
2495 | if (k_flags & HVhek_FREEKEY) |
2496 | Safefree(str); |
fde52b5c |
2497 | } |
2498 | |
bbce6d69 |
2499 | /* get a (constant) string ptr from the global string table |
2500 | * string will get added if it is not already there. |
fde52b5c |
2501 | * len and hash must both be valid for str. |
2502 | */ |
bbce6d69 |
2503 | HEK * |
864dbfa3 |
2504 | Perl_share_hek(pTHX_ const char *str, I32 len, register U32 hash) |
fde52b5c |
2505 | { |
da58a35d |
2506 | bool is_utf8 = FALSE; |
19692e8d |
2507 | int flags = 0; |
aec46f14 |
2508 | const char * const save = str; |
da58a35d |
2509 | |
2510 | if (len < 0) { |
77caf834 |
2511 | STRLEN tmplen = -len; |
da58a35d |
2512 | is_utf8 = TRUE; |
77caf834 |
2513 | /* See the note in hv_fetch(). --jhi */ |
2514 | str = (char*)bytes_from_utf8((U8*)str, &tmplen, &is_utf8); |
2515 | len = tmplen; |
19692e8d |
2516 | /* If we were able to downgrade here, then than means that we were passed |
2517 | in a key which only had chars 0-255, but was utf8 encoded. */ |
2518 | if (is_utf8) |
2519 | flags = HVhek_UTF8; |
2520 | /* If we found we were able to downgrade the string to bytes, then |
2521 | we should flag that it needs upgrading on keys or each. Also flag |
2522 | that we need share_hek_flags to free the string. */ |
2523 | if (str != save) |
2524 | flags |= HVhek_WASUTF8 | HVhek_FREEKEY; |
2525 | } |
2526 | |
6e838c70 |
2527 | return share_hek_flags (str, len, hash, flags); |
19692e8d |
2528 | } |
2529 | |
6e838c70 |
2530 | STATIC HEK * |
19692e8d |
2531 | S_share_hek_flags(pTHX_ const char *str, I32 len, register U32 hash, int flags) |
2532 | { |
97aff369 |
2533 | dVAR; |
19692e8d |
2534 | register HE *entry; |
35a4481c |
2535 | const int flags_masked = flags & HVhek_MASK; |
263cb4a6 |
2536 | const U32 hindex = hash & (I32) HvMAX(PL_strtab); |
bbce6d69 |
2537 | |
fde52b5c |
2538 | /* what follows is the moral equivalent of: |
1c846c1f |
2539 | |
6b88bc9c |
2540 | if (!(Svp = hv_fetch(PL_strtab, str, len, FALSE))) |
a0714e2c |
2541 | hv_store(PL_strtab, str, len, NULL, hash); |
fdcd69b6 |
2542 | |
2543 | Can't rehash the shared string table, so not sure if it's worth |
2544 | counting the number of entries in the linked list |
bbce6d69 |
2545 | */ |
1b6737cc |
2546 | register XPVHV * const xhv = (XPVHV*)SvANY(PL_strtab); |
fde52b5c |
2547 | /* assert(xhv_array != 0) */ |
5f08fbcd |
2548 | LOCK_STRTAB_MUTEX; |
263cb4a6 |
2549 | entry = (HvARRAY(PL_strtab))[hindex]; |
2550 | for (;entry; entry = HeNEXT(entry)) { |
fde52b5c |
2551 | if (HeHASH(entry) != hash) /* strings can't be equal */ |
2552 | continue; |
2553 | if (HeKLEN(entry) != len) |
2554 | continue; |
1c846c1f |
2555 | if (HeKEY(entry) != str && memNE(HeKEY(entry),str,len)) /* is this it? */ |
fde52b5c |
2556 | continue; |
19692e8d |
2557 | if (HeKFLAGS(entry) != flags_masked) |
c3654f1a |
2558 | continue; |
fde52b5c |
2559 | break; |
2560 | } |
263cb4a6 |
2561 | |
2562 | if (!entry) { |
45d1cc86 |
2563 | /* What used to be head of the list. |
2564 | If this is NULL, then we're the first entry for this slot, which |
2565 | means we need to increate fill. */ |
cbae3960 |
2566 | struct shared_he *new_entry; |
2567 | HEK *hek; |
2568 | char *k; |
263cb4a6 |
2569 | HE **const head = &HvARRAY(PL_strtab)[hindex]; |
2570 | HE *const next = *head; |
cbae3960 |
2571 | |
2572 | /* We don't actually store a HE from the arena and a regular HEK. |
2573 | Instead we allocate one chunk of memory big enough for both, |
2574 | and put the HEK straight after the HE. This way we can find the |
2575 | HEK directly from the HE. |
2576 | */ |
2577 | |
a02a5408 |
2578 | Newx(k, STRUCT_OFFSET(struct shared_he, |
cbae3960 |
2579 | shared_he_hek.hek_key[0]) + len + 2, char); |
2580 | new_entry = (struct shared_he *)k; |
2581 | entry = &(new_entry->shared_he_he); |
2582 | hek = &(new_entry->shared_he_hek); |
2583 | |
2584 | Copy(str, HEK_KEY(hek), len, char); |
2585 | HEK_KEY(hek)[len] = 0; |
2586 | HEK_LEN(hek) = len; |
2587 | HEK_HASH(hek) = hash; |
2588 | HEK_FLAGS(hek) = (unsigned char)flags_masked; |
2589 | |
2590 | /* Still "point" to the HEK, so that other code need not know what |
2591 | we're up to. */ |
2592 | HeKEY_hek(entry) = hek; |
de616631 |
2593 | entry->he_valu.hent_refcount = 0; |
263cb4a6 |
2594 | HeNEXT(entry) = next; |
2595 | *head = entry; |
cbae3960 |
2596 | |
4c7185a0 |
2597 | xhv->xhv_keys++; /* HvTOTALKEYS(hv)++ */ |
263cb4a6 |
2598 | if (!next) { /* initial entry? */ |
cbec9347 |
2599 | xhv->xhv_fill++; /* HvFILL(hv)++ */ |
4c9cc595 |
2600 | } else if (xhv->xhv_keys > (IV)xhv->xhv_max /* HvKEYS(hv) > HvMAX(hv) */) { |
cbec9347 |
2601 | hsplit(PL_strtab); |
bbce6d69 |
2602 | } |
2603 | } |
2604 | |
de616631 |
2605 | ++entry->he_valu.hent_refcount; |
5f08fbcd |
2606 | UNLOCK_STRTAB_MUTEX; |
19692e8d |
2607 | |
2608 | if (flags & HVhek_FREEKEY) |
f9a63242 |
2609 | Safefree(str); |
19692e8d |
2610 | |
6e838c70 |
2611 | return HeKEY_hek(entry); |
fde52b5c |
2612 | } |
ecae49c0 |
2613 | |
1e73acc8 |
2614 | STATIC SV * |
2615 | S_hv_magic_uvar_xkey(pTHX_ HV* hv, SV* keysv, int action) |
2616 | { |
2617 | MAGIC* mg; |
2618 | if ((mg = mg_find((SV*)hv, PERL_MAGIC_uvar))) { |
2619 | struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr; |
2620 | if (uf->uf_set == NULL) { |
2621 | SV* obj = mg->mg_obj; |
2622 | mg->mg_obj = keysv; /* pass key */ |
2623 | uf->uf_index = action; /* pass action */ |
2624 | magic_getuvar((SV*)hv, mg); |
2625 | keysv = mg->mg_obj; /* may have changed */ |
2626 | mg->mg_obj = obj; |
2627 | } |
2628 | } |
2629 | return keysv; |
2630 | } |
2631 | |
ca732855 |
2632 | I32 * |
2633 | Perl_hv_placeholders_p(pTHX_ HV *hv) |
2634 | { |
2635 | dVAR; |
2636 | MAGIC *mg = mg_find((SV*)hv, PERL_MAGIC_rhash); |
2637 | |
2638 | if (!mg) { |
2639 | mg = sv_magicext((SV*)hv, 0, PERL_MAGIC_rhash, 0, 0, 0); |
2640 | |
2641 | if (!mg) { |
2642 | Perl_die(aTHX_ "panic: hv_placeholders_p"); |
2643 | } |
2644 | } |
2645 | return &(mg->mg_len); |
2646 | } |
2647 | |
2648 | |
2649 | I32 |
2650 | Perl_hv_placeholders_get(pTHX_ HV *hv) |
2651 | { |
2652 | dVAR; |
b464bac0 |
2653 | MAGIC * const mg = mg_find((SV*)hv, PERL_MAGIC_rhash); |
ca732855 |
2654 | |
2655 | return mg ? mg->mg_len : 0; |
2656 | } |
2657 | |
2658 | void |
ac1e784a |
2659 | Perl_hv_placeholders_set(pTHX_ HV *hv, I32 ph) |
ca732855 |
2660 | { |
2661 | dVAR; |
b464bac0 |
2662 | MAGIC * const mg = mg_find((SV*)hv, PERL_MAGIC_rhash); |
ca732855 |
2663 | |
2664 | if (mg) { |
2665 | mg->mg_len = ph; |
2666 | } else if (ph) { |
2667 | if (!sv_magicext((SV*)hv, 0, PERL_MAGIC_rhash, 0, 0, ph)) |
2668 | Perl_die(aTHX_ "panic: hv_placeholders_set"); |
2669 | } |
2670 | /* else we don't need to add magic to record 0 placeholders. */ |
2671 | } |
ecae49c0 |
2672 | |
2a49f0f5 |
2673 | STATIC SV * |
7b0bddfa |
2674 | S_refcounted_he_value(pTHX_ const struct refcounted_he *he) |
2675 | { |
0b2d3faa |
2676 | dVAR; |
7b0bddfa |
2677 | SV *value; |
2678 | switch(he->refcounted_he_data[0] & HVrhek_typemask) { |
2679 | case HVrhek_undef: |
2680 | value = newSV(0); |
2681 | break; |
2682 | case HVrhek_delete: |
2683 | value = &PL_sv_placeholder; |
2684 | break; |
2685 | case HVrhek_IV: |
2686 | value = (he->refcounted_he_data[0] & HVrhek_UV) |
2687 | ? newSVuv(he->refcounted_he_val.refcounted_he_u_iv) |
2688 | : newSViv(he->refcounted_he_val.refcounted_he_u_uv); |
2689 | break; |
2690 | case HVrhek_PV: |
2691 | /* Create a string SV that directly points to the bytes in our |
2692 | structure. */ |
2693 | value = newSV(0); |
2694 | sv_upgrade(value, SVt_PV); |
2695 | SvPV_set(value, (char *) he->refcounted_he_data + 1); |
2696 | SvCUR_set(value, he->refcounted_he_val.refcounted_he_u_len); |
2697 | /* This stops anything trying to free it */ |
2698 | SvLEN_set(value, 0); |
2699 | SvPOK_on(value); |
2700 | SvREADONLY_on(value); |
2701 | if (he->refcounted_he_data[0] & HVrhek_UTF8) |
2702 | SvUTF8_on(value); |
2703 | break; |
2704 | default: |
2705 | Perl_croak(aTHX_ "panic: refcounted_he_value bad flags %x", |
2706 | he->refcounted_he_data[0]); |
2707 | } |
2708 | return value; |
2709 | } |
2710 | |
2711 | #ifdef USE_ITHREADS |
2712 | /* A big expression to find the key offset */ |
2713 | #define REF_HE_KEY(chain) \ |
2714 | ((((chain->refcounted_he_data[0] & HVrhek_typemask) == HVrhek_PV) \ |
2715 | ? chain->refcounted_he_val.refcounted_he_u_len + 1 : 0) \ |
2716 | + 1 + chain->refcounted_he_data) |
2717 | #endif |
2718 | |
ecae49c0 |
2719 | /* |
b3ca2e83 |
2720 | =for apidoc refcounted_he_chain_2hv |
2721 | |
2722 | Generates an returns a C<HV *> by walking up the tree starting at the passed |
2723 | in C<struct refcounted_he *>. |
2724 | |
2725 | =cut |
2726 | */ |
2727 | HV * |
2728 | Perl_refcounted_he_chain_2hv(pTHX_ const struct refcounted_he *chain) |
2729 | { |
7a89be66 |
2730 | dVAR; |
b3ca2e83 |
2731 | HV *hv = newHV(); |
2732 | U32 placeholders = 0; |
2733 | /* We could chase the chain once to get an idea of the number of keys, |
2734 | and call ksplit. But for now we'll make a potentially inefficient |
2735 | hash with only 8 entries in its array. */ |
2736 | const U32 max = HvMAX(hv); |
2737 | |
2738 | if (!HvARRAY(hv)) { |
2739 | char *array; |
2740 | Newxz(array, PERL_HV_ARRAY_ALLOC_BYTES(max + 1), char); |
2741 | HvARRAY(hv) = (HE**)array; |
2742 | } |
2743 | |
2744 | while (chain) { |
cbb1fbea |
2745 | #ifdef USE_ITHREADS |
b6bbf3fa |
2746 | U32 hash = chain->refcounted_he_hash; |
cbb1fbea |
2747 | #else |
2748 | U32 hash = HEK_HASH(chain->refcounted_he_hek); |
2749 | #endif |
b3ca2e83 |
2750 | HE **oentry = &((HvARRAY(hv))[hash & max]); |
2751 | HE *entry = *oentry; |
b6bbf3fa |
2752 | SV *value; |
cbb1fbea |
2753 | |
b3ca2e83 |
2754 | for (; entry; entry = HeNEXT(entry)) { |
2755 | if (HeHASH(entry) == hash) { |
9f769845 |
2756 | /* We might have a duplicate key here. If so, entry is older |
2757 | than the key we've already put in the hash, so if they are |
2758 | the same, skip adding entry. */ |
2759 | #ifdef USE_ITHREADS |
2760 | const STRLEN klen = HeKLEN(entry); |
2761 | const char *const key = HeKEY(entry); |
2762 | if (klen == chain->refcounted_he_keylen |
2763 | && (!!HeKUTF8(entry) |
2764 | == !!(chain->refcounted_he_data[0] & HVhek_UTF8)) |
2765 | && memEQ(key, REF_HE_KEY(chain), klen)) |
2766 | goto next_please; |
2767 | #else |
2768 | if (HeKEY_hek(entry) == chain->refcounted_he_hek) |
2769 | goto next_please; |
2770 | if (HeKLEN(entry) == HEK_LEN(chain->refcounted_he_hek) |
2771 | && HeKUTF8(entry) == HEK_UTF8(chain->refcounted_he_hek) |
2772 | && memEQ(HeKEY(entry), HEK_KEY(chain->refcounted_he_hek), |
2773 | HeKLEN(entry))) |
2774 | goto next_please; |
2775 | #endif |
b3ca2e83 |
2776 | } |
2777 | } |
2778 | assert (!entry); |
2779 | entry = new_HE(); |
2780 | |
cbb1fbea |
2781 | #ifdef USE_ITHREADS |
2782 | HeKEY_hek(entry) |
7b0bddfa |
2783 | = share_hek_flags(REF_HE_KEY(chain), |
b6bbf3fa |
2784 | chain->refcounted_he_keylen, |
2785 | chain->refcounted_he_hash, |
2786 | (chain->refcounted_he_data[0] |
2787 | & (HVhek_UTF8|HVhek_WASUTF8))); |
cbb1fbea |
2788 | #else |
71ad1b0c |
2789 | HeKEY_hek(entry) = share_hek_hek(chain->refcounted_he_hek); |
cbb1fbea |
2790 | #endif |
7b0bddfa |
2791 | value = refcounted_he_value(chain); |
2792 | if (value == &PL_sv_placeholder) |
b3ca2e83 |
2793 | placeholders++; |
b6bbf3fa |
2794 | HeVAL(entry) = value; |
b3ca2e83 |
2795 | |
2796 | /* Link it into the chain. */ |
2797 | HeNEXT(entry) = *oentry; |
2798 | if (!HeNEXT(entry)) { |
2799 | /* initial entry. */ |
2800 | HvFILL(hv)++; |
2801 | } |
2802 | *oentry = entry; |
2803 | |
2804 | HvTOTALKEYS(hv)++; |
2805 | |
2806 | next_please: |
71ad1b0c |
2807 | chain = chain->refcounted_he_next; |
b3ca2e83 |
2808 | } |
2809 | |
2810 | if (placeholders) { |
2811 | clear_placeholders(hv, placeholders); |
2812 | HvTOTALKEYS(hv) -= placeholders; |
2813 | } |
2814 | |
2815 | /* We could check in the loop to see if we encounter any keys with key |
2816 | flags, but it's probably not worth it, as this per-hash flag is only |
2817 | really meant as an optimisation for things like Storable. */ |
2818 | HvHASKFLAGS_on(hv); |
def9038f |
2819 | DEBUG_A(Perl_hv_assert(aTHX_ hv)); |
b3ca2e83 |
2820 | |
2821 | return hv; |
2822 | } |
2823 | |
7b0bddfa |
2824 | SV * |
2825 | Perl_refcounted_he_fetch(pTHX_ const struct refcounted_he *chain, SV *keysv, |
2826 | const char *key, STRLEN klen, int flags, U32 hash) |
2827 | { |
0b2d3faa |
2828 | dVAR; |
7b0bddfa |
2829 | /* Just to be awkward, if you're using this interface the UTF-8-or-not-ness |
2830 | of your key has to exactly match that which is stored. */ |
2831 | SV *value = &PL_sv_placeholder; |
d8c5b3c5 |
2832 | bool is_utf8; |
7b0bddfa |
2833 | |
2834 | if (keysv) { |
2835 | if (flags & HVhek_FREEKEY) |
2836 | Safefree(key); |
2837 | key = SvPV_const(keysv, klen); |
2838 | flags = 0; |
d8c5b3c5 |
2839 | is_utf8 = (SvUTF8(keysv) != 0); |
2840 | } else { |
2841 | is_utf8 = ((flags & HVhek_UTF8) ? TRUE : FALSE); |
7b0bddfa |
2842 | } |
2843 | |
2844 | if (!hash) { |
2845 | if (keysv && (SvIsCOW_shared_hash(keysv))) { |
2846 | hash = SvSHARED_HASH(keysv); |
2847 | } else { |
2848 | PERL_HASH(hash, key, klen); |
2849 | } |
2850 | } |
2851 | |
2852 | for (; chain; chain = chain->refcounted_he_next) { |
2853 | #ifdef USE_ITHREADS |
2854 | if (hash != chain->refcounted_he_hash) |
2855 | continue; |
2856 | if (klen != chain->refcounted_he_keylen) |
2857 | continue; |
2858 | if (memNE(REF_HE_KEY(chain),key,klen)) |
2859 | continue; |
d8c5b3c5 |
2860 | if (!!is_utf8 != !!(chain->refcounted_he_data[0] & HVhek_UTF8)) |
2861 | continue; |
7b0bddfa |
2862 | #else |
2863 | if (hash != HEK_HASH(chain->refcounted_he_hek)) |
2864 | continue; |
670f1322 |
2865 | if (klen != (STRLEN)HEK_LEN(chain->refcounted_he_hek)) |
7b0bddfa |
2866 | continue; |
2867 | if (memNE(HEK_KEY(chain->refcounted_he_hek),key,klen)) |
2868 | continue; |
d8c5b3c5 |
2869 | if (!!is_utf8 != !!HEK_UTF8(chain->refcounted_he_hek)) |
2870 | continue; |
7b0bddfa |
2871 | #endif |
2872 | |
2873 | value = sv_2mortal(refcounted_he_value(chain)); |
2874 | break; |
2875 | } |
2876 | |
2877 | if (flags & HVhek_FREEKEY) |
2878 | Safefree(key); |
2879 | |
2880 | return value; |
2881 | } |
2882 | |
b3ca2e83 |
2883 | /* |
2884 | =for apidoc refcounted_he_new |
2885 | |
ec2a1de7 |
2886 | Creates a new C<struct refcounted_he>. As S<key> is copied, and value is |
2887 | stored in a compact form, all references remain the property of the caller. |
2888 | The C<struct refcounted_he> is returned with a reference count of 1. |
b3ca2e83 |
2889 | |
2890 | =cut |
2891 | */ |
2892 | |
2893 | struct refcounted_he * |
2894 | Perl_refcounted_he_new(pTHX_ struct refcounted_he *const parent, |
2895 | SV *const key, SV *const value) { |
7a89be66 |
2896 | dVAR; |
b3ca2e83 |
2897 | struct refcounted_he *he; |
b6bbf3fa |
2898 | STRLEN key_len; |
2899 | const char *key_p = SvPV_const(key, key_len); |
2900 | STRLEN value_len = 0; |
95b63a38 |
2901 | const char *value_p = NULL; |
b6bbf3fa |
2902 | char value_type; |
2903 | char flags; |
2904 | STRLEN key_offset; |
b3ca2e83 |
2905 | U32 hash; |
d8c5b3c5 |
2906 | bool is_utf8 = SvUTF8(key) ? TRUE : FALSE; |
b6bbf3fa |
2907 | |
2908 | if (SvPOK(value)) { |
2909 | value_type = HVrhek_PV; |
2910 | } else if (SvIOK(value)) { |
2911 | value_type = HVrhek_IV; |
2912 | } else if (value == &PL_sv_placeholder) { |
2913 | value_type = HVrhek_delete; |
2914 | } else if (!SvOK(value)) { |
2915 | value_type = HVrhek_undef; |
2916 | } else { |
2917 | value_type = HVrhek_PV; |
2918 | } |
b3ca2e83 |
2919 | |
b6bbf3fa |
2920 | if (value_type == HVrhek_PV) { |
2921 | value_p = SvPV_const(value, value_len); |
2922 | key_offset = value_len + 2; |
2923 | } else { |
2924 | value_len = 0; |
2925 | key_offset = 1; |
2926 | } |
2927 | flags = value_type; |
2928 | |
b6bbf3fa |
2929 | #ifdef USE_ITHREADS |
10edeb5d |
2930 | he = (struct refcounted_he*) |
2931 | PerlMemShared_malloc(sizeof(struct refcounted_he) - 1 |
2932 | + key_len |
2933 | + key_offset); |
6cef672b |
2934 | #else |
10edeb5d |
2935 | he = (struct refcounted_he*) |
2936 | PerlMemShared_malloc(sizeof(struct refcounted_he) - 1 |
2937 | + key_offset); |
6cef672b |
2938 | #endif |
b3ca2e83 |
2939 | |
b3ca2e83 |
2940 | |
71ad1b0c |
2941 | he->refcounted_he_next = parent; |
b6bbf3fa |
2942 | |
2943 | if (value_type == HVrhek_PV) { |
2944 | Copy(value_p, he->refcounted_he_data + 1, value_len + 1, char); |
2945 | he->refcounted_he_val.refcounted_he_u_len = value_len; |
2946 | if (SvUTF8(value)) { |
2947 | flags |= HVrhek_UTF8; |
2948 | } |
2949 | } else if (value_type == HVrhek_IV) { |
2950 | if (SvUOK(value)) { |
2951 | he->refcounted_he_val.refcounted_he_u_uv = SvUVX(value); |
2952 | flags |= HVrhek_UV; |
2953 | } else { |
2954 | he->refcounted_he_val.refcounted_he_u_iv = SvIVX(value); |
2955 | } |
2956 | } |
2957 | |
2958 | if (is_utf8) { |
2959 | /* Hash keys are always stored normalised to (yes) ISO-8859-1. |
2960 | As we're going to be building hash keys from this value in future, |
2961 | normalise it now. */ |
2962 | key_p = (char*)bytes_from_utf8((const U8*)key_p, &key_len, &is_utf8); |
2963 | flags |= is_utf8 ? HVhek_UTF8 : HVhek_WASUTF8; |
2964 | } |
2965 | PERL_HASH(hash, key_p, key_len); |
2966 | |
cbb1fbea |
2967 | #ifdef USE_ITHREADS |
b6bbf3fa |
2968 | he->refcounted_he_hash = hash; |
2969 | he->refcounted_he_keylen = key_len; |
2970 | Copy(key_p, he->refcounted_he_data + key_offset, key_len, char); |
cbb1fbea |
2971 | #else |
b6bbf3fa |
2972 | he->refcounted_he_hek = share_hek_flags(key_p, key_len, hash, flags); |
cbb1fbea |
2973 | #endif |
b6bbf3fa |
2974 | |
2975 | if (flags & HVhek_WASUTF8) { |
2976 | /* If it was downgraded from UTF-8, then the pointer returned from |
2977 | bytes_from_utf8 is an allocated pointer that we must free. */ |
2978 | Safefree(key_p); |
2979 | } |
2980 | |
2981 | he->refcounted_he_data[0] = flags; |
b3ca2e83 |
2982 | he->refcounted_he_refcnt = 1; |
2983 | |
2984 | return he; |
2985 | } |
2986 | |
2987 | /* |
2988 | =for apidoc refcounted_he_free |
2989 | |
2990 | Decrements the reference count of the passed in C<struct refcounted_he *> |
2991 | by one. If the reference count reaches zero the structure's memory is freed, |
2992 | and C<refcounted_he_free> iterates onto the parent node. |
2993 | |
2994 | =cut |
2995 | */ |
2996 | |
2997 | void |
2998 | Perl_refcounted_he_free(pTHX_ struct refcounted_he *he) { |
57ca3b03 |
2999 | PERL_UNUSED_CONTEXT; |
3000 | |
b3ca2e83 |
3001 | while (he) { |
3002 | struct refcounted_he *copy; |
cbb1fbea |
3003 | U32 new_count; |
b3ca2e83 |
3004 | |
cbb1fbea |
3005 | HINTS_REFCNT_LOCK; |
3006 | new_count = --he->refcounted_he_refcnt; |
3007 | HINTS_REFCNT_UNLOCK; |
3008 | |
3009 | if (new_count) { |
b3ca2e83 |
3010 | return; |
cbb1fbea |
3011 | } |
b3ca2e83 |
3012 | |
b6bbf3fa |
3013 | #ifndef USE_ITHREADS |
71ad1b0c |
3014 | unshare_hek_or_pvn (he->refcounted_he_hek, 0, 0, 0); |
cbb1fbea |
3015 | #endif |
b3ca2e83 |
3016 | copy = he; |
71ad1b0c |
3017 | he = he->refcounted_he_next; |
b6bbf3fa |
3018 | PerlMemShared_free(copy); |
b3ca2e83 |
3019 | } |
3020 | } |
3021 | |
b3ca2e83 |
3022 | /* |
ecae49c0 |
3023 | =for apidoc hv_assert |
3024 | |
3025 | Check that a hash is in an internally consistent state. |
3026 | |
3027 | =cut |
3028 | */ |
3029 | |
943795c2 |
3030 | #ifdef DEBUGGING |
3031 | |
ecae49c0 |
3032 | void |
3033 | Perl_hv_assert(pTHX_ HV *hv) |
3034 | { |
57ca3b03 |
3035 | dVAR; |
3036 | HE* entry; |
3037 | int withflags = 0; |
3038 | int placeholders = 0; |
3039 | int real = 0; |
3040 | int bad = 0; |
3041 | const I32 riter = HvRITER_get(hv); |
3042 | HE *eiter = HvEITER_get(hv); |
3043 | |
3044 | (void)hv_iterinit(hv); |
3045 | |
3046 | while ((entry = hv_iternext_flags(hv, HV_ITERNEXT_WANTPLACEHOLDERS))) { |
3047 | /* sanity check the values */ |
3048 | if (HeVAL(entry) == &PL_sv_placeholder) |
3049 | placeholders++; |
3050 | else |
3051 | real++; |
3052 | /* sanity check the keys */ |
3053 | if (HeSVKEY(entry)) { |
6f207bd3 |
3054 | NOOP; /* Don't know what to check on SV keys. */ |
57ca3b03 |
3055 | } else if (HeKUTF8(entry)) { |
3056 | withflags++; |
3057 | if (HeKWASUTF8(entry)) { |
3058 | PerlIO_printf(Perl_debug_log, |
3059 | "hash key has both WASUFT8 and UTF8: '%.*s'\n", |
3060 | (int) HeKLEN(entry), HeKEY(entry)); |
3061 | bad = 1; |
3062 | } |
3063 | } else if (HeKWASUTF8(entry)) |
3064 | withflags++; |
3065 | } |
3066 | if (!SvTIED_mg((SV*)hv, PERL_MAGIC_tied)) { |
3067 | static const char bad_count[] = "Count %d %s(s), but hash reports %d\n"; |
3068 | const int nhashkeys = HvUSEDKEYS(hv); |
3069 | const int nhashplaceholders = HvPLACEHOLDERS_get(hv); |
3070 | |
3071 | if (nhashkeys != real) { |
3072 | PerlIO_printf(Perl_debug_log, bad_count, real, "keys", nhashkeys ); |
3073 | bad = 1; |
3074 | } |
3075 | if (nhashplaceholders != placeholders) { |
3076 | PerlIO_printf(Perl_debug_log, bad_count, placeholders, "placeholder", nhashplaceholders ); |
3077 | bad = 1; |
3078 | } |
3079 | } |
3080 | if (withflags && ! HvHASKFLAGS(hv)) { |
3081 | PerlIO_printf(Perl_debug_log, |
3082 | "Hash has HASKFLAGS off but I count %d key(s) with flags\n", |
3083 | withflags); |
3084 | bad = 1; |
3085 | } |
3086 | if (bad) { |
3087 | sv_dump((SV *)hv); |
3088 | } |
3089 | HvRITER_set(hv, riter); /* Restore hash iterator state */ |
3090 | HvEITER_set(hv, eiter); |
ecae49c0 |
3091 | } |
af3babe4 |
3092 | |
943795c2 |
3093 | #endif |
3094 | |
af3babe4 |
3095 | /* |
3096 | * Local variables: |
3097 | * c-indentation-style: bsd |
3098 | * c-basic-offset: 4 |
3099 | * indent-tabs-mode: t |
3100 | * End: |
3101 | * |
37442d52 |
3102 | * ex: set ts=8 sts=4 sw=4 noet: |
3103 | */ |