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annotate src/elhash.c @ 4985:358aa3bb603f
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| author | Ben Wing <ben@xemacs.org> |
|---|---|
| date | Fri, 05 Feb 2010 12:12:28 -0600 |
| parents | 16112448d484 |
| children | 6afe991b8135 b5df3737028a |
| rev | line source |
|---|---|
| 428 | 1 /* Implementation of the hash table lisp object type. |
| 2 Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc. | |
| 2421 | 3 Copyright (C) 1995, 1996, 2002, 2004 Ben Wing. |
| 428 | 4 Copyright (C) 1997 Free Software Foundation, Inc. |
| 5 | |
| 6 This file is part of XEmacs. | |
| 7 | |
| 8 XEmacs is free software; you can redistribute it and/or modify it | |
| 9 under the terms of the GNU General Public License as published by the | |
| 10 Free Software Foundation; either version 2, or (at your option) any | |
| 11 later version. | |
| 12 | |
| 13 XEmacs is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCNTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 16 for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with XEmacs; see the file COPYING. If not, write to | |
| 20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 21 Boston, MA 02111-1307, USA. */ | |
| 22 | |
| 23 /* Synched up with: Not in FSF. */ | |
| 24 | |
| 1292 | 25 /* Author: Lost in the mists of history. At least back to Lucid 19.3, |
| 26 circa Sep 1992. Early hash table implementation allowed only `eq' as a | |
| 27 test -- other tests possible only when these objects were created from | |
| 28 the C code. | |
| 29 | |
| 30 Expansion to allow general `equal'-test Lisp-creatable tables, and hash | |
| 31 methods for the various Lisp objects in existence at the time, added | |
| 32 during 19.12 I think (early 1995?), by Ben Wing. | |
| 33 | |
| 34 Weak hash tables added by Jamie (maybe?) early on, perhaps around 19.6, | |
| 35 maybe earlier; again, only possible through the C code, and only | |
| 36 supported fully weak hash tables. Expansion to other kinds of weakness, | |
| 37 and exporting of the interface to Lisp, by Ben Wing during 19.12 | |
| 38 (early-mid 1995) or maybe 19.13 cycle (mid 1995). | |
| 39 | |
| 40 Expansion to full Common Lisp spec and interface, redoing of the | |
| 41 implementation, by Martin Buchholz, 1997? (Former hash table | |
| 42 implementation used "double hashing", I'm pretty sure, and was weirdly | |
| 43 tied into the generic hash.c code. Martin completely separated them.) | |
| 44 */ | |
| 45 | |
| 489 | 46 /* This file implements the hash table lisp object type. |
| 47 | |
| 504 | 48 This implementation was mostly written by Martin Buchholz in 1997. |
| 49 | |
| 50 The Lisp-level API (derived from Common Lisp) is almost completely | |
| 51 compatible with GNU Emacs 21, even though the implementations are | |
| 52 totally independent. | |
| 53 | |
| 489 | 54 The hash table technique used is "linear probing". Collisions are |
| 55 resolved by putting the item in the next empty place in the array | |
| 56 following the collision. Finding a hash entry performs a linear | |
| 57 search in the cluster starting at the hash value. | |
| 58 | |
| 59 On deletions from the hash table, the entries immediately following | |
| 60 the deleted entry are re-entered in the hash table. We do not have | |
| 61 a special way to mark deleted entries (known as "tombstones"). | |
| 62 | |
| 63 At the end of the hash entries ("hentries"), we leave room for an | |
| 64 entry that is always empty (the "sentinel"). | |
| 65 | |
| 66 The traditional literature on hash table implementation | |
| 67 (e.g. Knuth) suggests that too much "primary clustering" occurs | |
| 68 with linear probing. However, this literature was written when | |
| 69 locality of reference was not a factor. The discrepancy between | |
| 70 CPU speeds and memory speeds is increasing, and the speed of access | |
| 71 to memory is highly dependent on memory caches which work best when | |
| 72 there is high locality of data reference. Random access to memory | |
| 73 is up to 20 times as expensive as access to the nearest address | |
| 74 (and getting worse). So linear probing makes sense. | |
| 75 | |
| 76 But the representation doesn't actually matter that much with the | |
| 77 current elisp engine. Funcall is sufficiently slow that the choice | |
| 78 of hash table implementation is noise. */ | |
| 79 | |
| 428 | 80 #include <config.h> |
| 81 #include "lisp.h" | |
| 82 #include "bytecode.h" | |
| 83 #include "elhash.h" | |
| 489 | 84 #include "opaque.h" |
| 428 | 85 |
| 86 Lisp_Object Qhash_tablep; | |
| 87 static Lisp_Object Qhashtable, Qhash_table; | |
| 442 | 88 static Lisp_Object Qweakness, Qvalue, Qkey_or_value, Qkey_and_value; |
| 428 | 89 static Lisp_Object Vall_weak_hash_tables; |
| 90 static Lisp_Object Qrehash_size, Qrehash_threshold; | |
| 91 static Lisp_Object Q_size, Q_test, Q_weakness, Q_rehash_size, Q_rehash_threshold; | |
| 92 | |
| 93 /* obsolete as of 19990901 in xemacs-21.2 */ | |
| 442 | 94 static Lisp_Object Qweak, Qkey_weak, Qvalue_weak, Qkey_or_value_weak; |
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95 static Lisp_Object Qnon_weak, Q_type, Q_data; |
| 428 | 96 |
| 97 struct Lisp_Hash_Table | |
| 98 { | |
| 3017 | 99 struct LCRECORD_HEADER header; |
| 665 | 100 Elemcount size; |
| 101 Elemcount count; | |
| 102 Elemcount rehash_count; | |
| 428 | 103 double rehash_size; |
| 104 double rehash_threshold; | |
| 665 | 105 Elemcount golden_ratio; |
| 428 | 106 hash_table_hash_function_t hash_function; |
| 107 hash_table_test_function_t test_function; | |
| 1204 | 108 htentry *hentries; |
| 428 | 109 enum hash_table_weakness weakness; |
| 110 Lisp_Object next_weak; /* Used to chain together all of the weak | |
| 111 hash tables. Don't mark through this. */ | |
| 112 }; | |
| 113 | |
| 1204 | 114 #define CLEAR_HTENTRY(htentry) \ |
| 115 ((*(EMACS_UINT*)(&((htentry)->key))) = 0, \ | |
| 116 (*(EMACS_UINT*)(&((htentry)->value))) = 0) | |
| 428 | 117 |
| 118 #define HASH_TABLE_DEFAULT_SIZE 16 | |
| 119 #define HASH_TABLE_DEFAULT_REHASH_SIZE 1.3 | |
| 120 #define HASH_TABLE_MIN_SIZE 10 | |
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121 #define HASH_TABLE_DEFAULT_REHASH_THRESHOLD(size, test_function) \ |
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122 (((size) > 4096 && NULL == (test_function)) ? 0.7 : 0.6) |
| 428 | 123 |
| 665 | 124 #define HASHCODE(key, ht) \ |
| 444 | 125 ((((ht)->hash_function ? (ht)->hash_function (key) : LISP_HASH (key)) \ |
| 126 * (ht)->golden_ratio) \ | |
| 127 % (ht)->size) | |
| 428 | 128 |
| 129 #define KEYS_EQUAL_P(key1, key2, testfun) \ | |
| 434 | 130 (EQ (key1, key2) || ((testfun) && (testfun) (key1, key2))) |
| 428 | 131 |
| 132 #define LINEAR_PROBING_LOOP(probe, entries, size) \ | |
| 133 for (; \ | |
| 1204 | 134 !HTENTRY_CLEAR_P (probe) || \ |
| 428 | 135 (probe == entries + size ? \ |
| 1204 | 136 (probe = entries, !HTENTRY_CLEAR_P (probe)) : 0); \ |
| 428 | 137 probe++) |
| 138 | |
| 800 | 139 #ifdef ERROR_CHECK_STRUCTURES |
| 428 | 140 static void |
| 141 check_hash_table_invariants (Lisp_Hash_Table *ht) | |
| 142 { | |
| 143 assert (ht->count < ht->size); | |
| 144 assert (ht->count <= ht->rehash_count); | |
| 145 assert (ht->rehash_count < ht->size); | |
| 146 assert ((double) ht->count * ht->rehash_threshold - 1 <= (double) ht->rehash_count); | |
| 1204 | 147 assert (HTENTRY_CLEAR_P (ht->hentries + ht->size)); |
| 428 | 148 } |
| 149 #else | |
| 150 #define check_hash_table_invariants(ht) | |
| 151 #endif | |
| 152 | |
| 153 /* Return a suitable size for a hash table, with at least SIZE slots. */ | |
| 665 | 154 static Elemcount |
| 155 hash_table_size (Elemcount requested_size) | |
| 428 | 156 { |
| 157 /* Return some prime near, but greater than or equal to, SIZE. | |
| 158 Decades from the time of writing, someone will have a system large | |
| 159 enough that the list below will be too short... */ | |
| 665 | 160 static const Elemcount primes [] = |
| 428 | 161 { |
| 162 19, 29, 41, 59, 79, 107, 149, 197, 263, 347, 457, 599, 787, 1031, | |
| 163 1361, 1777, 2333, 3037, 3967, 5167, 6719, 8737, 11369, 14783, | |
| 164 19219, 24989, 32491, 42257, 54941, 71429, 92861, 120721, 156941, | |
| 165 204047, 265271, 344857, 448321, 582821, 757693, 985003, 1280519, | |
| 166 1664681, 2164111, 2813353, 3657361, 4754591, 6180989, 8035301, | |
| 167 10445899, 13579681, 17653589, 22949669, 29834603, 38784989, | |
| 168 50420551, 65546729, 85210757, 110774011, 144006217, 187208107, | |
| 169 243370577, 316381771, 411296309, 534685237, 695090819, 903618083, | |
| 647 | 170 1174703521, 1527114613, 1985248999 /* , 2580823717UL, 3355070839UL */ |
| 428 | 171 }; |
| 172 /* We've heard of binary search. */ | |
| 173 int low, high; | |
| 174 for (low = 0, high = countof (primes) - 1; high - low > 1;) | |
| 175 { | |
| 176 /* Loop Invariant: size < primes [high] */ | |
| 177 int mid = (low + high) / 2; | |
| 178 if (primes [mid] < requested_size) | |
| 179 low = mid; | |
| 180 else | |
| 181 high = mid; | |
| 182 } | |
| 183 return primes [high]; | |
| 184 } | |
| 185 | |
| 186 | |
| 187 | |
| 188 static int | |
| 189 lisp_object_eql_equal (Lisp_Object obj1, Lisp_Object obj2) | |
| 190 { | |
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191 return EQ (obj1, obj2) || |
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192 (NON_FIXNUM_NUMBER_P (obj1) && internal_equal (obj1, obj2, 0)); |
| 428 | 193 } |
| 194 | |
| 665 | 195 static Hashcode |
| 428 | 196 lisp_object_eql_hash (Lisp_Object obj) |
| 197 { | |
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198 return NON_FIXNUM_NUMBER_P (obj) ? internal_hash (obj, 0) : LISP_HASH (obj); |
| 428 | 199 } |
| 200 | |
| 201 static int | |
| 202 lisp_object_equal_equal (Lisp_Object obj1, Lisp_Object obj2) | |
| 203 { | |
| 204 return internal_equal (obj1, obj2, 0); | |
| 205 } | |
| 206 | |
| 665 | 207 static Hashcode |
| 428 | 208 lisp_object_equal_hash (Lisp_Object obj) |
| 209 { | |
| 210 return internal_hash (obj, 0); | |
| 211 } | |
| 212 | |
| 213 | |
| 214 static Lisp_Object | |
| 215 mark_hash_table (Lisp_Object obj) | |
| 216 { | |
| 217 Lisp_Hash_Table *ht = XHASH_TABLE (obj); | |
| 218 | |
| 219 /* If the hash table is weak, we don't want to mark the keys and | |
| 220 values (we scan over them after everything else has been marked, | |
| 221 and mark or remove them as necessary). */ | |
| 222 if (ht->weakness == HASH_TABLE_NON_WEAK) | |
| 223 { | |
| 1204 | 224 htentry *e, *sentinel; |
| 428 | 225 |
| 226 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 227 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 228 { |
| 229 mark_object (e->key); | |
| 230 mark_object (e->value); | |
| 231 } | |
| 232 } | |
| 233 return Qnil; | |
| 234 } | |
| 235 | |
| 236 /* Equality of hash tables. Two hash tables are equal when they are of | |
| 237 the same weakness and test function, they have the same number of | |
| 238 elements, and for each key in the hash table, the values are `equal'. | |
| 239 | |
| 240 This is similar to Common Lisp `equalp' of hash tables, with the | |
| 241 difference that CL requires the keys to be compared with the test | |
| 242 function, which we don't do. Doing that would require consing, and | |
| 243 consing is a bad idea in `equal'. Anyway, our method should provide | |
| 244 the same result -- if the keys are not equal according to the test | |
| 245 function, then Fgethash() in hash_table_equal_mapper() will fail. */ | |
| 246 static int | |
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247 hash_table_equal (Lisp_Object hash_table1, Lisp_Object hash_table2, int depth, |
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248 int foldcase) |
| 428 | 249 { |
| 250 Lisp_Hash_Table *ht1 = XHASH_TABLE (hash_table1); | |
| 251 Lisp_Hash_Table *ht2 = XHASH_TABLE (hash_table2); | |
| 1204 | 252 htentry *e, *sentinel; |
| 428 | 253 |
| 254 if ((ht1->test_function != ht2->test_function) || | |
| 255 (ht1->weakness != ht2->weakness) || | |
| 256 (ht1->count != ht2->count)) | |
| 257 return 0; | |
| 258 | |
| 259 depth++; | |
| 260 | |
| 261 for (e = ht1->hentries, sentinel = e + ht1->size; e < sentinel; e++) | |
| 1204 | 262 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 263 /* Look up the key in the other hash table, and compare the values. */ |
| 264 { | |
| 265 Lisp_Object value_in_other = Fgethash (e->key, hash_table2, Qunbound); | |
| 266 if (UNBOUNDP (value_in_other) || | |
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267 !internal_equal_0 (e->value, value_in_other, depth, foldcase)) |
| 428 | 268 return 0; /* Give up */ |
| 269 } | |
| 270 | |
| 271 return 1; | |
| 272 } | |
| 442 | 273 |
| 274 /* This is not a great hash function, but it _is_ correct and fast. | |
| 275 Examining all entries is too expensive, and examining a random | |
| 276 subset does not yield a correct hash function. */ | |
| 665 | 277 static Hashcode |
| 2286 | 278 hash_table_hash (Lisp_Object hash_table, int UNUSED (depth)) |
| 442 | 279 { |
| 280 return XHASH_TABLE (hash_table)->count; | |
| 281 } | |
| 282 | |
| 428 | 283 |
| 284 /* Printing hash tables. | |
| 285 | |
| 286 This is non-trivial, because we use a readable structure-style | |
| 287 syntax for hash tables. This means that a typical hash table will be | |
| 288 readably printed in the form of: | |
| 289 | |
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290 #s(hash-table :size 2 :data (key1 value1 key2 value2)) |
| 428 | 291 |
| 292 The supported hash table structure keywords and their values are: | |
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293 `:test' (eql (or nil), eq or equal) |
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294 `:size' (a natnum or nil) |
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295 `:rehash-size' (a float) |
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296 `:rehash-threshold' (a float) |
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297 `:weakness' (nil, key, value, key-and-value, or key-or-value) |
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298 `:data' (a list) |
| 428 | 299 |
| 430 | 300 If `print-readably' is nil, then a simpler syntax is used, for example |
| 428 | 301 |
| 302 #<hash-table size 2/13 data (key1 value1 key2 value2) 0x874d> | |
| 303 | |
| 304 The data is truncated to four pairs, and the rest is shown with | |
| 305 `...'. This printer does not cons. */ | |
| 306 | |
| 307 | |
| 308 /* Print the data of the hash table. This maps through a Lisp | |
| 309 hash table and prints key/value pairs using PRINTCHARFUN. */ | |
| 310 static void | |
| 311 print_hash_table_data (Lisp_Hash_Table *ht, Lisp_Object printcharfun) | |
| 312 { | |
| 313 int count = 0; | |
| 1204 | 314 htentry *e, *sentinel; |
| 428 | 315 |
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316 write_ascstring (printcharfun, " :data ("); |
| 428 | 317 |
| 318 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 319 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 320 { |
| 321 if (count > 0) | |
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322 write_ascstring (printcharfun, " "); |
| 428 | 323 if (!print_readably && count > 3) |
| 324 { | |
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325 write_ascstring (printcharfun, "..."); |
| 428 | 326 break; |
| 327 } | |
| 328 print_internal (e->key, printcharfun, 1); | |
| 800 | 329 write_fmt_string_lisp (printcharfun, " %S", 1, e->value); |
| 428 | 330 count++; |
| 331 } | |
| 332 | |
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333 write_ascstring (printcharfun, ")"); |
| 428 | 334 } |
| 335 | |
| 336 static void | |
| 2286 | 337 print_hash_table (Lisp_Object obj, Lisp_Object printcharfun, |
| 338 int UNUSED (escapeflag)) | |
| 428 | 339 { |
| 340 Lisp_Hash_Table *ht = XHASH_TABLE (obj); | |
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341 Ascbyte pigbuf[350]; |
| 428 | 342 |
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343 write_ascstring (printcharfun, |
| 826 | 344 print_readably ? "#s(hash-table" : "#<hash-table"); |
| 428 | 345 |
| 346 /* These checks have a kludgy look to them, but they are safe. | |
| 347 Due to nature of hashing, you cannot use arbitrary | |
| 348 test functions anyway. */ | |
| 349 if (!ht->test_function) | |
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350 write_ascstring (printcharfun, " :test eq"); |
| 428 | 351 else if (ht->test_function == lisp_object_equal_equal) |
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352 write_ascstring (printcharfun, " :test equal"); |
| 428 | 353 else if (ht->test_function == lisp_object_eql_equal) |
| 354 DO_NOTHING; | |
| 355 else | |
| 2500 | 356 ABORT (); |
| 428 | 357 |
| 358 if (ht->count || !print_readably) | |
| 359 { | |
| 360 if (print_readably) | |
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361 write_fmt_string (printcharfun, " :size %ld", (long) ht->count); |
| 428 | 362 else |
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363 write_fmt_string (printcharfun, " :size %ld/%ld", (long) ht->count, |
| 800 | 364 (long) ht->size); |
| 428 | 365 } |
| 366 | |
| 367 if (ht->weakness != HASH_TABLE_NON_WEAK) | |
| 368 { | |
| 800 | 369 write_fmt_string |
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370 (printcharfun, " :weakness %s", |
| 800 | 371 (ht->weakness == HASH_TABLE_WEAK ? "key-and-value" : |
| 372 ht->weakness == HASH_TABLE_KEY_WEAK ? "key" : | |
| 373 ht->weakness == HASH_TABLE_VALUE_WEAK ? "value" : | |
| 374 ht->weakness == HASH_TABLE_KEY_VALUE_WEAK ? "key-or-value" : | |
| 375 "you-d-better-not-see-this")); | |
| 428 | 376 } |
| 377 | |
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378 if (ht->rehash_size != HASH_TABLE_DEFAULT_REHASH_SIZE) |
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379 { |
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380 float_to_string (pigbuf, ht->rehash_size); |
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381 write_fmt_string (printcharfun, " :rehash-size %s", pigbuf); |
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382 } |
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383 |
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384 if (ht->rehash_threshold |
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385 != HASH_TABLE_DEFAULT_REHASH_THRESHOLD (ht->size, |
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386 ht->test_function)) |
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387 { |
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388 float_to_string (pigbuf, ht->rehash_threshold); |
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389 write_fmt_string (printcharfun, " :rehash-threshold %s", pigbuf); |
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390 } |
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391 |
| 428 | 392 if (ht->count) |
| 393 print_hash_table_data (ht, printcharfun); | |
| 394 | |
| 395 if (print_readably) | |
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396 write_ascstring (printcharfun, ")"); |
| 428 | 397 else |
| 2421 | 398 write_fmt_string (printcharfun, " 0x%x>", ht->header.uid); |
| 428 | 399 } |
| 400 | |
| 4117 | 401 #ifndef NEW_GC |
| 428 | 402 static void |
| 4117 | 403 free_hentries (htentry *hentries, |
| 2333 | 404 #ifdef ERROR_CHECK_STRUCTURES |
| 405 size_t size | |
| 4117 | 406 #else /* not ERROR_CHECK_STRUCTURES) */ |
| 2333 | 407 size_t UNUSED (size) |
| 4117 | 408 #endif /* not ERROR_CHECK_STRUCTURES) */ |
| 2333 | 409 ) |
| 489 | 410 { |
| 800 | 411 #ifdef ERROR_CHECK_STRUCTURES |
| 489 | 412 /* Ensure a crash if other code uses the discarded entries afterwards. */ |
| 1204 | 413 htentry *e, *sentinel; |
| 489 | 414 |
| 415 for (e = hentries, sentinel = e + size; e < sentinel; e++) | |
| 1204 | 416 * (unsigned long *) e = 0xdeadbeef; /* -559038737 base 10 */ |
| 489 | 417 #endif |
| 418 | |
| 419 if (!DUMPEDP (hentries)) | |
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420 xfree (hentries); |
| 489 | 421 } |
| 422 | |
| 423 static void | |
| 428 | 424 finalize_hash_table (void *header, int for_disksave) |
| 425 { | |
| 426 if (!for_disksave) | |
| 427 { | |
| 428 Lisp_Hash_Table *ht = (Lisp_Hash_Table *) header; | |
| 489 | 429 free_hentries (ht->hentries, ht->size); |
| 428 | 430 ht->hentries = 0; |
| 431 } | |
| 432 } | |
| 3263 | 433 #endif /* not NEW_GC */ |
| 428 | 434 |
| 1204 | 435 static const struct memory_description htentry_description_1[] = { |
| 436 { XD_LISP_OBJECT, offsetof (htentry, key) }, | |
| 437 { XD_LISP_OBJECT, offsetof (htentry, value) }, | |
| 428 | 438 { XD_END } |
| 439 }; | |
| 440 | |
| 1204 | 441 static const struct sized_memory_description htentry_description = { |
| 442 sizeof (htentry), | |
| 443 htentry_description_1 | |
| 428 | 444 }; |
| 445 | |
| 3092 | 446 #ifdef NEW_GC |
| 447 static const struct memory_description htentry_weak_description_1[] = { | |
| 448 { XD_LISP_OBJECT, offsetof (htentry, key), 0, { 0 }, XD_FLAG_NO_KKCC}, | |
| 449 { XD_LISP_OBJECT, offsetof (htentry, value), 0, { 0 }, XD_FLAG_NO_KKCC}, | |
| 450 { XD_END } | |
| 451 }; | |
| 452 | |
| 453 static const struct sized_memory_description htentry_weak_description = { | |
| 454 sizeof (htentry), | |
| 455 htentry_weak_description_1 | |
| 456 }; | |
| 457 | |
| 458 DEFINE_LRECORD_IMPLEMENTATION ("hash-table-entry", hash_table_entry, | |
| 459 1, /*dumpable-flag*/ | |
| 460 0, 0, 0, 0, 0, | |
| 461 htentry_description_1, | |
| 462 Lisp_Hash_Table_Entry); | |
| 463 #endif /* NEW_GC */ | |
| 464 | |
| 1204 | 465 static const struct memory_description htentry_union_description_1[] = { |
| 466 /* Note: XD_INDIRECT in this table refers to the surrounding table, | |
| 467 and so this will work. */ | |
| 3092 | 468 #ifdef NEW_GC |
| 469 { XD_LISP_OBJECT_BLOCK_PTR, HASH_TABLE_NON_WEAK, | |
| 470 XD_INDIRECT (0, 1), { &htentry_description } }, | |
| 471 { XD_LISP_OBJECT_BLOCK_PTR, 0, XD_INDIRECT (0, 1), | |
| 472 { &htentry_weak_description }, XD_FLAG_UNION_DEFAULT_ENTRY }, | |
| 473 #else /* not NEW_GC */ | |
| 2367 | 474 { XD_BLOCK_PTR, HASH_TABLE_NON_WEAK, XD_INDIRECT (0, 1), |
| 2551 | 475 { &htentry_description } }, |
| 476 { XD_BLOCK_PTR, 0, XD_INDIRECT (0, 1), { &htentry_description }, | |
| 1204 | 477 XD_FLAG_UNION_DEFAULT_ENTRY | XD_FLAG_NO_KKCC }, |
| 3092 | 478 #endif /* not NEW_GC */ |
| 1204 | 479 { XD_END } |
| 480 }; | |
| 481 | |
| 482 static const struct sized_memory_description htentry_union_description = { | |
| 483 sizeof (htentry *), | |
| 484 htentry_union_description_1 | |
| 485 }; | |
| 486 | |
| 487 const struct memory_description hash_table_description[] = { | |
| 488 { XD_ELEMCOUNT, offsetof (Lisp_Hash_Table, size) }, | |
| 489 { XD_INT, offsetof (Lisp_Hash_Table, weakness) }, | |
| 490 { XD_UNION, offsetof (Lisp_Hash_Table, hentries), XD_INDIRECT (1, 0), | |
| 2551 | 491 { &htentry_union_description } }, |
| 440 | 492 { XD_LO_LINK, offsetof (Lisp_Hash_Table, next_weak) }, |
| 428 | 493 { XD_END } |
| 494 }; | |
| 495 | |
| 3263 | 496 #ifdef NEW_GC |
| 497 DEFINE_LRECORD_IMPLEMENTATION ("hash-table", hash_table, | |
| 498 1, /*dumpable-flag*/ | |
| 499 mark_hash_table, print_hash_table, | |
| 500 0, hash_table_equal, hash_table_hash, | |
| 501 hash_table_description, | |
| 502 Lisp_Hash_Table); | |
| 503 #else /* not NEW_GC */ | |
| 934 | 504 DEFINE_LRECORD_IMPLEMENTATION ("hash-table", hash_table, |
| 505 1, /*dumpable-flag*/ | |
| 506 mark_hash_table, print_hash_table, | |
| 507 finalize_hash_table, | |
| 508 hash_table_equal, hash_table_hash, | |
| 509 hash_table_description, | |
| 510 Lisp_Hash_Table); | |
| 3263 | 511 #endif /* not NEW_GC */ |
| 428 | 512 |
| 513 static Lisp_Hash_Table * | |
| 514 xhash_table (Lisp_Object hash_table) | |
| 515 { | |
| 1123 | 516 /* #### What's going on here? Why the gc_in_progress check? */ |
| 428 | 517 if (!gc_in_progress) |
| 518 CHECK_HASH_TABLE (hash_table); | |
| 519 check_hash_table_invariants (XHASH_TABLE (hash_table)); | |
| 520 return XHASH_TABLE (hash_table); | |
| 521 } | |
| 522 | |
| 523 | |
| 524 /************************************************************************/ | |
| 525 /* Creation of Hash Tables */ | |
| 526 /************************************************************************/ | |
| 527 | |
| 528 /* Creation of hash tables, without error-checking. */ | |
| 529 static void | |
| 530 compute_hash_table_derived_values (Lisp_Hash_Table *ht) | |
| 531 { | |
| 665 | 532 ht->rehash_count = (Elemcount) |
| 438 | 533 ((double) ht->size * ht->rehash_threshold); |
| 665 | 534 ht->golden_ratio = (Elemcount) |
| 428 | 535 ((double) ht->size * (.6180339887 / (double) sizeof (Lisp_Object))); |
| 536 } | |
| 537 | |
| 538 Lisp_Object | |
| 450 | 539 make_standard_lisp_hash_table (enum hash_table_test test, |
| 665 | 540 Elemcount size, |
| 450 | 541 double rehash_size, |
| 542 double rehash_threshold, | |
| 543 enum hash_table_weakness weakness) | |
| 544 { | |
| 462 | 545 hash_table_hash_function_t hash_function = 0; |
| 450 | 546 hash_table_test_function_t test_function = 0; |
| 547 | |
| 548 switch (test) | |
| 549 { | |
| 550 case HASH_TABLE_EQ: | |
| 551 test_function = 0; | |
| 552 hash_function = 0; | |
| 553 break; | |
| 554 | |
| 555 case HASH_TABLE_EQL: | |
| 556 test_function = lisp_object_eql_equal; | |
| 557 hash_function = lisp_object_eql_hash; | |
| 558 break; | |
| 559 | |
| 560 case HASH_TABLE_EQUAL: | |
| 561 test_function = lisp_object_equal_equal; | |
| 562 hash_function = lisp_object_equal_hash; | |
| 563 break; | |
| 564 | |
| 565 default: | |
| 2500 | 566 ABORT (); |
| 450 | 567 } |
| 568 | |
| 569 return make_general_lisp_hash_table (hash_function, test_function, | |
| 570 size, rehash_size, rehash_threshold, | |
| 571 weakness); | |
| 572 } | |
| 573 | |
| 574 Lisp_Object | |
| 575 make_general_lisp_hash_table (hash_table_hash_function_t hash_function, | |
| 576 hash_table_test_function_t test_function, | |
| 665 | 577 Elemcount size, |
| 428 | 578 double rehash_size, |
| 579 double rehash_threshold, | |
| 580 enum hash_table_weakness weakness) | |
| 581 { | |
| 582 Lisp_Object hash_table; | |
| 3017 | 583 Lisp_Hash_Table *ht = ALLOC_LCRECORD_TYPE (Lisp_Hash_Table, &lrecord_hash_table); |
| 428 | 584 |
| 450 | 585 ht->test_function = test_function; |
| 586 ht->hash_function = hash_function; | |
| 438 | 587 ht->weakness = weakness; |
| 588 | |
| 589 ht->rehash_size = | |
| 590 rehash_size > 1.0 ? rehash_size : HASH_TABLE_DEFAULT_REHASH_SIZE; | |
| 591 | |
| 592 ht->rehash_threshold = | |
| 593 rehash_threshold > 0.0 ? rehash_threshold : | |
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594 HASH_TABLE_DEFAULT_REHASH_THRESHOLD (size, ht->test_function); |
| 438 | 595 |
| 428 | 596 if (size < HASH_TABLE_MIN_SIZE) |
| 597 size = HASH_TABLE_MIN_SIZE; | |
| 665 | 598 ht->size = hash_table_size ((Elemcount) (((double) size / ht->rehash_threshold) |
| 438 | 599 + 1.0)); |
| 428 | 600 ht->count = 0; |
| 438 | 601 |
| 428 | 602 compute_hash_table_derived_values (ht); |
| 603 | |
| 1204 | 604 /* We leave room for one never-occupied sentinel htentry at the end. */ |
| 3092 | 605 #ifdef NEW_GC |
| 606 ht->hentries = (htentry *) alloc_lrecord_array (sizeof (htentry), | |
| 607 ht->size + 1, | |
| 608 &lrecord_hash_table_entry); | |
| 609 #else /* not NEW_GC */ | |
| 1204 | 610 ht->hentries = xnew_array_and_zero (htentry, ht->size + 1); |
| 3092 | 611 #endif /* not NEW_GC */ |
| 428 | 612 |
| 793 | 613 hash_table = wrap_hash_table (ht); |
| 428 | 614 |
| 615 if (weakness == HASH_TABLE_NON_WEAK) | |
| 616 ht->next_weak = Qunbound; | |
| 617 else | |
| 618 ht->next_weak = Vall_weak_hash_tables, Vall_weak_hash_tables = hash_table; | |
| 619 | |
| 620 return hash_table; | |
| 621 } | |
| 622 | |
| 623 Lisp_Object | |
| 665 | 624 make_lisp_hash_table (Elemcount size, |
| 428 | 625 enum hash_table_weakness weakness, |
| 626 enum hash_table_test test) | |
| 627 { | |
| 450 | 628 return make_standard_lisp_hash_table (test, size, -1.0, -1.0, weakness); |
| 428 | 629 } |
| 630 | |
| 631 /* Pretty reading of hash tables. | |
| 632 | |
| 633 Here we use the existing structures mechanism (which is, | |
| 634 unfortunately, pretty cumbersome) for validating and instantiating | |
| 635 the hash tables. The idea is that the side-effect of reading a | |
| 636 #s(hash-table PLIST) object is creation of a hash table with desired | |
| 637 properties, and that the hash table is returned. */ | |
| 638 | |
| 639 /* Validation functions: each keyword provides its own validation | |
| 640 function. The errors should maybe be continuable, but it is | |
| 641 unclear how this would cope with ERRB. */ | |
| 642 static int | |
| 2286 | 643 hash_table_size_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 644 Error_Behavior errb) | |
| 428 | 645 { |
| 646 if (NATNUMP (value)) | |
| 647 return 1; | |
| 648 | |
| 563 | 649 maybe_signal_error_1 (Qwrong_type_argument, list2 (Qnatnump, value), |
| 2286 | 650 Qhash_table, errb); |
| 428 | 651 return 0; |
| 652 } | |
| 653 | |
| 665 | 654 static Elemcount |
| 428 | 655 decode_hash_table_size (Lisp_Object obj) |
| 656 { | |
| 657 return NILP (obj) ? HASH_TABLE_DEFAULT_SIZE : XINT (obj); | |
| 658 } | |
| 659 | |
| 660 static int | |
| 2286 | 661 hash_table_weakness_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 578 | 662 Error_Behavior errb) |
| 428 | 663 { |
| 442 | 664 if (EQ (value, Qnil)) return 1; |
| 665 if (EQ (value, Qt)) return 1; | |
| 666 if (EQ (value, Qkey)) return 1; | |
| 667 if (EQ (value, Qkey_and_value)) return 1; | |
| 668 if (EQ (value, Qkey_or_value)) return 1; | |
| 669 if (EQ (value, Qvalue)) return 1; | |
| 428 | 670 |
| 671 /* Following values are obsolete as of 19990901 in xemacs-21.2 */ | |
| 442 | 672 if (EQ (value, Qnon_weak)) return 1; |
| 673 if (EQ (value, Qweak)) return 1; | |
| 674 if (EQ (value, Qkey_weak)) return 1; | |
| 675 if (EQ (value, Qkey_or_value_weak)) return 1; | |
| 676 if (EQ (value, Qvalue_weak)) return 1; | |
| 428 | 677 |
| 563 | 678 maybe_invalid_constant ("Invalid hash table weakness", |
| 428 | 679 value, Qhash_table, errb); |
| 680 return 0; | |
| 681 } | |
| 682 | |
| 683 static enum hash_table_weakness | |
| 684 decode_hash_table_weakness (Lisp_Object obj) | |
| 685 { | |
| 442 | 686 if (EQ (obj, Qnil)) return HASH_TABLE_NON_WEAK; |
| 687 if (EQ (obj, Qt)) return HASH_TABLE_WEAK; | |
| 688 if (EQ (obj, Qkey_and_value)) return HASH_TABLE_WEAK; | |
| 689 if (EQ (obj, Qkey)) return HASH_TABLE_KEY_WEAK; | |
| 690 if (EQ (obj, Qkey_or_value)) return HASH_TABLE_KEY_VALUE_WEAK; | |
| 691 if (EQ (obj, Qvalue)) return HASH_TABLE_VALUE_WEAK; | |
| 428 | 692 |
| 693 /* Following values are obsolete as of 19990901 in xemacs-21.2 */ | |
| 442 | 694 if (EQ (obj, Qnon_weak)) return HASH_TABLE_NON_WEAK; |
| 695 if (EQ (obj, Qweak)) return HASH_TABLE_WEAK; | |
| 696 if (EQ (obj, Qkey_weak)) return HASH_TABLE_KEY_WEAK; | |
| 697 if (EQ (obj, Qkey_or_value_weak)) return HASH_TABLE_KEY_VALUE_WEAK; | |
| 698 if (EQ (obj, Qvalue_weak)) return HASH_TABLE_VALUE_WEAK; | |
| 428 | 699 |
| 563 | 700 invalid_constant ("Invalid hash table weakness", obj); |
| 1204 | 701 RETURN_NOT_REACHED (HASH_TABLE_NON_WEAK); |
| 428 | 702 } |
| 703 | |
| 704 static int | |
| 2286 | 705 hash_table_test_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 706 Error_Behavior errb) | |
| 428 | 707 { |
| 708 if (EQ (value, Qnil)) return 1; | |
| 709 if (EQ (value, Qeq)) return 1; | |
| 710 if (EQ (value, Qequal)) return 1; | |
| 711 if (EQ (value, Qeql)) return 1; | |
| 712 | |
| 563 | 713 maybe_invalid_constant ("Invalid hash table test", |
| 2286 | 714 value, Qhash_table, errb); |
| 428 | 715 return 0; |
| 716 } | |
| 717 | |
| 718 static enum hash_table_test | |
| 719 decode_hash_table_test (Lisp_Object obj) | |
| 720 { | |
| 721 if (EQ (obj, Qnil)) return HASH_TABLE_EQL; | |
| 722 if (EQ (obj, Qeq)) return HASH_TABLE_EQ; | |
| 723 if (EQ (obj, Qequal)) return HASH_TABLE_EQUAL; | |
| 724 if (EQ (obj, Qeql)) return HASH_TABLE_EQL; | |
| 725 | |
| 563 | 726 invalid_constant ("Invalid hash table test", obj); |
| 1204 | 727 RETURN_NOT_REACHED (HASH_TABLE_EQ); |
| 428 | 728 } |
| 729 | |
| 730 static int | |
| 2286 | 731 hash_table_rehash_size_validate (Lisp_Object UNUSED (keyword), |
| 732 Lisp_Object value, Error_Behavior errb) | |
| 428 | 733 { |
| 734 if (!FLOATP (value)) | |
| 735 { | |
| 563 | 736 maybe_signal_error_1 (Qwrong_type_argument, list2 (Qfloatp, value), |
| 428 | 737 Qhash_table, errb); |
| 738 return 0; | |
| 739 } | |
| 740 | |
| 741 { | |
| 742 double rehash_size = XFLOAT_DATA (value); | |
| 743 if (rehash_size <= 1.0) | |
| 744 { | |
| 563 | 745 maybe_invalid_argument |
| 428 | 746 ("Hash table rehash size must be greater than 1.0", |
| 747 value, Qhash_table, errb); | |
| 748 return 0; | |
| 749 } | |
| 750 } | |
| 751 | |
| 752 return 1; | |
| 753 } | |
| 754 | |
| 755 static double | |
| 756 decode_hash_table_rehash_size (Lisp_Object rehash_size) | |
| 757 { | |
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758 /* -1.0 signals make_general_lisp_hash_table to use the default. */ |
| 428 | 759 return NILP (rehash_size) ? -1.0 : XFLOAT_DATA (rehash_size); |
| 760 } | |
| 761 | |
| 762 static int | |
| 2286 | 763 hash_table_rehash_threshold_validate (Lisp_Object UNUSED (keyword), |
| 764 Lisp_Object value, Error_Behavior errb) | |
| 428 | 765 { |
| 766 if (!FLOATP (value)) | |
| 767 { | |
| 563 | 768 maybe_signal_error_1 (Qwrong_type_argument, list2 (Qfloatp, value), |
| 428 | 769 Qhash_table, errb); |
| 770 return 0; | |
| 771 } | |
| 772 | |
| 773 { | |
| 774 double rehash_threshold = XFLOAT_DATA (value); | |
| 775 if (rehash_threshold <= 0.0 || rehash_threshold >= 1.0) | |
| 776 { | |
| 563 | 777 maybe_invalid_argument |
| 428 | 778 ("Hash table rehash threshold must be between 0.0 and 1.0", |
| 779 value, Qhash_table, errb); | |
| 780 return 0; | |
| 781 } | |
| 782 } | |
| 783 | |
| 784 return 1; | |
| 785 } | |
| 786 | |
| 787 static double | |
| 788 decode_hash_table_rehash_threshold (Lisp_Object rehash_threshold) | |
| 789 { | |
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790 /* -1.0 signals make_general_lisp_hash_table to use the default. */ |
| 428 | 791 return NILP (rehash_threshold) ? -1.0 : XFLOAT_DATA (rehash_threshold); |
| 792 } | |
| 793 | |
| 794 static int | |
| 2286 | 795 hash_table_data_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 796 Error_Behavior errb) | |
| 428 | 797 { |
| 798 int len; | |
| 799 | |
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800 /* Check for improper lists while getting length. */ |
| 428 | 801 GET_EXTERNAL_LIST_LENGTH (value, len); |
| 802 | |
| 803 if (len & 1) | |
| 804 { | |
| 563 | 805 maybe_sferror |
| 428 | 806 ("Hash table data must have alternating key/value pairs", |
| 807 value, Qhash_table, errb); | |
| 808 return 0; | |
| 809 } | |
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810 |
| 428 | 811 return 1; |
| 812 } | |
| 813 | |
| 814 /* The actual instantiation of a hash table. This does practically no | |
| 815 error checking, because it relies on the fact that the paranoid | |
| 816 functions above have error-checked everything to the last details. | |
| 817 If this assumption is wrong, we will get a crash immediately (with | |
| 818 error-checking compiled in), and we'll know if there is a bug in | |
| 819 the structure mechanism. So there. */ | |
| 820 static Lisp_Object | |
| 821 hash_table_instantiate (Lisp_Object plist) | |
| 822 { | |
| 823 Lisp_Object hash_table; | |
| 824 Lisp_Object test = Qnil; | |
| 825 Lisp_Object size = Qnil; | |
| 826 Lisp_Object rehash_size = Qnil; | |
| 827 Lisp_Object rehash_threshold = Qnil; | |
| 828 Lisp_Object weakness = Qnil; | |
| 829 Lisp_Object data = Qnil; | |
| 830 | |
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831 if (KEYWORDP (Fcar (plist))) |
| 428 | 832 { |
|
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833 PROPERTY_LIST_LOOP_3 (key, value, plist) |
|
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834 { |
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835 if (EQ (key, Q_test)) test = value; |
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836 else if (EQ (key, Q_size)) size = value; |
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837 else if (EQ (key, Q_rehash_size)) rehash_size = value; |
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838 else if (EQ (key, Q_rehash_threshold)) rehash_threshold = value; |
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839 else if (EQ (key, Q_weakness)) weakness = value; |
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840 else if (EQ (key, Q_data)) data = value; |
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841 else if (!KEYWORDP (key)) |
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842 signal_error (Qinvalid_read_syntax, |
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843 "can't mix keyword and non-keyword hash table syntax", |
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844 key); |
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845 else ABORT(); |
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846 } |
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847 } |
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848 else |
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849 { |
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850 PROPERTY_LIST_LOOP_3 (key, value, plist) |
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851 { |
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852 if (EQ (key, Qtest)) test = value; |
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853 else if (EQ (key, Qsize)) size = value; |
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854 else if (EQ (key, Qrehash_size)) rehash_size = value; |
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855 else if (EQ (key, Qrehash_threshold)) rehash_threshold = value; |
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856 else if (EQ (key, Qweakness)) weakness = value; |
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857 else if (EQ (key, Qdata)) data = value; |
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858 else if (EQ (key, Qtype))/*obsolete*/ weakness = value; |
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859 else if (KEYWORDP (key)) |
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860 signal_error (Qinvalid_read_syntax, |
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861 "can't mix keyword and non-keyword hash table syntax", |
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862 key); |
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863 else ABORT(); |
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864 } |
| 428 | 865 } |
| 866 | |
| 867 /* Create the hash table. */ | |
| 450 | 868 hash_table = make_standard_lisp_hash_table |
| 428 | 869 (decode_hash_table_test (test), |
| 870 decode_hash_table_size (size), | |
| 871 decode_hash_table_rehash_size (rehash_size), | |
| 872 decode_hash_table_rehash_threshold (rehash_threshold), | |
| 873 decode_hash_table_weakness (weakness)); | |
| 874 | |
| 875 /* I'm not sure whether this can GC, but better safe than sorry. */ | |
| 876 { | |
| 877 struct gcpro gcpro1; | |
| 878 GCPRO1 (hash_table); | |
| 879 | |
| 880 /* And fill it with data. */ | |
| 881 while (!NILP (data)) | |
| 882 { | |
| 883 Lisp_Object key, value; | |
| 884 key = XCAR (data); data = XCDR (data); | |
| 885 value = XCAR (data); data = XCDR (data); | |
| 886 Fputhash (key, value, hash_table); | |
| 887 } | |
| 888 UNGCPRO; | |
| 889 } | |
| 890 | |
| 891 return hash_table; | |
| 892 } | |
| 893 | |
| 894 static void | |
| 895 structure_type_create_hash_table_structure_name (Lisp_Object structure_name) | |
| 896 { | |
| 897 struct structure_type *st; | |
| 898 | |
| 899 st = define_structure_type (structure_name, 0, hash_table_instantiate); | |
|
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900 |
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901 /* First the keyword syntax: */ |
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902 define_structure_type_keyword (st, Q_test, hash_table_test_validate); |
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903 define_structure_type_keyword (st, Q_size, hash_table_size_validate); |
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904 define_structure_type_keyword (st, Q_rehash_size, hash_table_rehash_size_validate); |
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905 define_structure_type_keyword (st, Q_rehash_threshold, hash_table_rehash_threshold_validate); |
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906 define_structure_type_keyword (st, Q_weakness, hash_table_weakness_validate); |
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907 define_structure_type_keyword (st, Q_data, hash_table_data_validate); |
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908 |
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909 /* Next the mutually exclusive, older, non-keyword syntax: */ |
| 428 | 910 define_structure_type_keyword (st, Qtest, hash_table_test_validate); |
| 911 define_structure_type_keyword (st, Qsize, hash_table_size_validate); | |
| 912 define_structure_type_keyword (st, Qrehash_size, hash_table_rehash_size_validate); | |
| 913 define_structure_type_keyword (st, Qrehash_threshold, hash_table_rehash_threshold_validate); | |
| 914 define_structure_type_keyword (st, Qweakness, hash_table_weakness_validate); | |
| 915 define_structure_type_keyword (st, Qdata, hash_table_data_validate); | |
| 916 | |
| 917 /* obsolete as of 19990901 in xemacs-21.2 */ | |
| 918 define_structure_type_keyword (st, Qtype, hash_table_weakness_validate); | |
| 919 } | |
| 920 | |
| 921 /* Create a built-in Lisp structure type named `hash-table'. | |
| 922 We make #s(hashtable ...) equivalent to #s(hash-table ...), | |
| 923 for backward compatibility. | |
| 924 This is called from emacs.c. */ | |
| 925 void | |
| 926 structure_type_create_hash_table (void) | |
| 927 { | |
| 928 structure_type_create_hash_table_structure_name (Qhash_table); | |
| 929 structure_type_create_hash_table_structure_name (Qhashtable); /* compat */ | |
| 930 } | |
| 931 | |
| 932 | |
| 933 /************************************************************************/ | |
| 934 /* Definition of Lisp-visible methods */ | |
| 935 /************************************************************************/ | |
| 936 | |
| 937 DEFUN ("hash-table-p", Fhash_table_p, 1, 1, 0, /* | |
| 938 Return t if OBJECT is a hash table, else nil. | |
| 939 */ | |
| 940 (object)) | |
| 941 { | |
| 942 return HASH_TABLEP (object) ? Qt : Qnil; | |
| 943 } | |
| 944 | |
| 945 DEFUN ("make-hash-table", Fmake_hash_table, 0, MANY, 0, /* | |
| 946 Return a new empty hash table object. | |
| 947 Use Common Lisp style keywords to specify hash table properties. | |
| 948 | |
| 949 Keyword :test can be `eq', `eql' (default) or `equal'. | |
| 950 Comparison between keys is done using this function. | |
| 951 If speed is important, consider using `eq'. | |
| 952 When storing strings in the hash table, you will likely need to use `equal'. | |
| 953 | |
| 954 Keyword :size specifies the number of keys likely to be inserted. | |
| 955 This number of entries can be inserted without enlarging the hash table. | |
| 956 | |
| 957 Keyword :rehash-size must be a float greater than 1.0, and specifies | |
| 958 the factor by which to increase the size of the hash table when enlarging. | |
| 959 | |
| 960 Keyword :rehash-threshold must be a float between 0.0 and 1.0, | |
| 961 and specifies the load factor of the hash table which triggers enlarging. | |
| 962 | |
| 442 | 963 Non-standard keyword :weakness can be `nil' (default), `t', `key-and-value', |
| 964 `key', `value' or `key-or-value'. `t' is an alias for `key-and-value'. | |
| 428 | 965 |
| 442 | 966 A key-and-value-weak hash table, also known as a fully-weak or simply |
| 967 as a weak hash table, is one whose pointers do not count as GC | |
| 968 referents: for any key-value pair in the hash table, if the only | |
| 969 remaining pointer to either the key or the value is in a weak hash | |
| 970 table, then the pair will be removed from the hash table, and the key | |
| 971 and value collected. A non-weak hash table (or any other pointer) | |
| 972 would prevent the object from being collected. | |
| 428 | 973 |
| 974 A key-weak hash table is similar to a fully-weak hash table except that | |
| 975 a key-value pair will be removed only if the key remains unmarked | |
| 976 outside of weak hash tables. The pair will remain in the hash table if | |
| 977 the key is pointed to by something other than a weak hash table, even | |
| 978 if the value is not. | |
| 979 | |
| 980 A value-weak hash table is similar to a fully-weak hash table except | |
| 981 that a key-value pair will be removed only if the value remains | |
| 982 unmarked outside of weak hash tables. The pair will remain in the | |
| 983 hash table if the value is pointed to by something other than a weak | |
| 984 hash table, even if the key is not. | |
| 442 | 985 |
| 986 A key-or-value-weak hash table is similar to a fully-weak hash table except | |
| 987 that a key-value pair will be removed only if the value and the key remain | |
| 988 unmarked outside of weak hash tables. The pair will remain in the | |
| 989 hash table if the value or key are pointed to by something other than a weak | |
| 990 hash table, even if the other is not. | |
|
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991 |
|
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992 arguments: (&key TEST SIZE REHASH-SIZE REHASH-THRESHOLD WEAKNESS) |
| 428 | 993 */ |
| 994 (int nargs, Lisp_Object *args)) | |
| 995 { | |
| 996 int i = 0; | |
| 997 Lisp_Object test = Qnil; | |
| 998 Lisp_Object size = Qnil; | |
| 999 Lisp_Object rehash_size = Qnil; | |
| 1000 Lisp_Object rehash_threshold = Qnil; | |
| 1001 Lisp_Object weakness = Qnil; | |
| 1002 | |
| 1003 while (i + 1 < nargs) | |
| 1004 { | |
| 1005 Lisp_Object keyword = args[i++]; | |
| 1006 Lisp_Object value = args[i++]; | |
| 1007 | |
| 1008 if (EQ (keyword, Q_test)) test = value; | |
| 1009 else if (EQ (keyword, Q_size)) size = value; | |
| 1010 else if (EQ (keyword, Q_rehash_size)) rehash_size = value; | |
| 1011 else if (EQ (keyword, Q_rehash_threshold)) rehash_threshold = value; | |
| 1012 else if (EQ (keyword, Q_weakness)) weakness = value; | |
| 1013 else if (EQ (keyword, Q_type))/*obsolete*/ weakness = value; | |
| 563 | 1014 else invalid_constant ("Invalid hash table property keyword", keyword); |
| 428 | 1015 } |
| 1016 | |
| 1017 if (i < nargs) | |
| 563 | 1018 sferror ("Hash table property requires a value", args[i]); |
| 428 | 1019 |
| 1020 #define VALIDATE_VAR(var) \ | |
| 1021 if (!NILP (var)) hash_table_##var##_validate (Q##var, var, ERROR_ME); | |
| 1022 | |
| 1023 VALIDATE_VAR (test); | |
| 1024 VALIDATE_VAR (size); | |
| 1025 VALIDATE_VAR (rehash_size); | |
| 1026 VALIDATE_VAR (rehash_threshold); | |
| 1027 VALIDATE_VAR (weakness); | |
| 1028 | |
| 450 | 1029 return make_standard_lisp_hash_table |
| 428 | 1030 (decode_hash_table_test (test), |
| 1031 decode_hash_table_size (size), | |
| 1032 decode_hash_table_rehash_size (rehash_size), | |
| 1033 decode_hash_table_rehash_threshold (rehash_threshold), | |
| 1034 decode_hash_table_weakness (weakness)); | |
| 1035 } | |
| 1036 | |
| 1037 DEFUN ("copy-hash-table", Fcopy_hash_table, 1, 1, 0, /* | |
| 1038 Return a new hash table containing the same keys and values as HASH-TABLE. | |
| 1039 The keys and values will not themselves be copied. | |
| 1040 */ | |
| 1041 (hash_table)) | |
| 1042 { | |
| 442 | 1043 const Lisp_Hash_Table *ht_old = xhash_table (hash_table); |
| 3017 | 1044 Lisp_Hash_Table *ht = ALLOC_LCRECORD_TYPE (Lisp_Hash_Table, &lrecord_hash_table); |
| 1045 COPY_LCRECORD (ht, ht_old); | |
| 428 | 1046 |
| 3092 | 1047 #ifdef NEW_GC |
| 1048 ht->hentries = (htentry *) alloc_lrecord_array (sizeof (htentry), | |
| 1049 ht_old->size + 1, | |
| 1050 &lrecord_hash_table_entry); | |
| 1051 #else /* not NEW_GC */ | |
| 1204 | 1052 ht->hentries = xnew_array (htentry, ht_old->size + 1); |
| 3092 | 1053 #endif /* not NEW_GC */ |
| 1204 | 1054 memcpy (ht->hentries, ht_old->hentries, (ht_old->size + 1) * sizeof (htentry)); |
| 428 | 1055 |
| 793 | 1056 hash_table = wrap_hash_table (ht); |
| 428 | 1057 |
| 1058 if (! EQ (ht->next_weak, Qunbound)) | |
| 1059 { | |
| 1060 ht->next_weak = Vall_weak_hash_tables; | |
| 1061 Vall_weak_hash_tables = hash_table; | |
| 1062 } | |
| 1063 | |
| 1064 return hash_table; | |
| 1065 } | |
| 1066 | |
| 1067 static void | |
| 665 | 1068 resize_hash_table (Lisp_Hash_Table *ht, Elemcount new_size) |
| 428 | 1069 { |
| 1204 | 1070 htentry *old_entries, *new_entries, *sentinel, *e; |
| 665 | 1071 Elemcount old_size; |
| 428 | 1072 |
| 1073 old_size = ht->size; | |
| 1074 ht->size = new_size; | |
| 1075 | |
| 1076 old_entries = ht->hentries; | |
| 1077 | |
| 3092 | 1078 #ifdef NEW_GC |
| 1079 ht->hentries = (htentry *) alloc_lrecord_array (sizeof (htentry), | |
| 1080 new_size + 1, | |
| 1081 &lrecord_hash_table_entry); | |
| 1082 #else /* not NEW_GC */ | |
| 1204 | 1083 ht->hentries = xnew_array_and_zero (htentry, new_size + 1); |
| 3092 | 1084 #endif /* not NEW_GC */ |
| 428 | 1085 new_entries = ht->hentries; |
| 1086 | |
| 1087 compute_hash_table_derived_values (ht); | |
| 1088 | |
| 440 | 1089 for (e = old_entries, sentinel = e + old_size; e < sentinel; e++) |
| 1204 | 1090 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1091 { |
| 1204 | 1092 htentry *probe = new_entries + HASHCODE (e->key, ht); |
| 428 | 1093 LINEAR_PROBING_LOOP (probe, new_entries, new_size) |
| 1094 ; | |
| 1095 *probe = *e; | |
| 1096 } | |
| 1097 | |
| 4117 | 1098 #ifndef NEW_GC |
| 489 | 1099 free_hentries (old_entries, old_size); |
| 4117 | 1100 #endif /* not NEW_GC */ |
| 428 | 1101 } |
| 1102 | |
| 440 | 1103 /* After a hash table has been saved to disk and later restored by the |
| 1104 portable dumper, it contains the same objects, but their addresses | |
| 665 | 1105 and thus their HASHCODEs have changed. */ |
| 428 | 1106 void |
| 440 | 1107 pdump_reorganize_hash_table (Lisp_Object hash_table) |
| 428 | 1108 { |
| 442 | 1109 const Lisp_Hash_Table *ht = xhash_table (hash_table); |
| 3092 | 1110 #ifdef NEW_GC |
| 1111 htentry *new_entries = | |
| 1112 (htentry *) alloc_lrecord_array (sizeof (htentry), ht->size + 1, | |
| 1113 &lrecord_hash_table_entry); | |
| 1114 #else /* not NEW_GC */ | |
| 1204 | 1115 htentry *new_entries = xnew_array_and_zero (htentry, ht->size + 1); |
| 3092 | 1116 #endif /* not NEW_GC */ |
| 1204 | 1117 htentry *e, *sentinel; |
| 440 | 1118 |
| 1119 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 1120 if (!HTENTRY_CLEAR_P (e)) |
| 440 | 1121 { |
| 1204 | 1122 htentry *probe = new_entries + HASHCODE (e->key, ht); |
| 440 | 1123 LINEAR_PROBING_LOOP (probe, new_entries, ht->size) |
| 1124 ; | |
| 1125 *probe = *e; | |
| 1126 } | |
| 1127 | |
| 1204 | 1128 memcpy (ht->hentries, new_entries, ht->size * sizeof (htentry)); |
| 440 | 1129 |
| 4117 | 1130 #ifndef NEW_GC |
|
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1131 xfree (new_entries); |
| 3092 | 1132 #endif /* not NEW_GC */ |
| 428 | 1133 } |
| 1134 | |
| 1135 static void | |
| 1136 enlarge_hash_table (Lisp_Hash_Table *ht) | |
| 1137 { | |
| 665 | 1138 Elemcount new_size = |
| 1139 hash_table_size ((Elemcount) ((double) ht->size * ht->rehash_size)); | |
| 428 | 1140 resize_hash_table (ht, new_size); |
| 1141 } | |
| 1142 | |
| 4072 | 1143 htentry * |
| 1204 | 1144 find_htentry (Lisp_Object key, const Lisp_Hash_Table *ht) |
| 428 | 1145 { |
| 1146 hash_table_test_function_t test_function = ht->test_function; | |
| 1204 | 1147 htentry *entries = ht->hentries; |
| 1148 htentry *probe = entries + HASHCODE (key, ht); | |
| 428 | 1149 |
| 1150 LINEAR_PROBING_LOOP (probe, entries, ht->size) | |
| 1151 if (KEYS_EQUAL_P (probe->key, key, test_function)) | |
| 1152 break; | |
| 1153 | |
| 1154 return probe; | |
| 1155 } | |
| 1156 | |
| 2421 | 1157 /* A version of Fputhash() that increments the value by the specified |
| 1158 amount and dispenses will all error checks. Assumes that tables does | |
| 1159 comparison using EQ. Used by the profiling routines to avoid | |
| 1160 overhead -- profiling overhead was being recorded at up to 15% of the | |
| 1161 total time. */ | |
| 1162 | |
| 1163 void | |
| 1164 inchash_eq (Lisp_Object key, Lisp_Object table, EMACS_INT offset) | |
| 1165 { | |
| 1166 Lisp_Hash_Table *ht = XHASH_TABLE (table); | |
| 1167 htentry *entries = ht->hentries; | |
| 1168 htentry *probe = entries + HASHCODE (key, ht); | |
| 1169 | |
| 1170 LINEAR_PROBING_LOOP (probe, entries, ht->size) | |
| 1171 if (EQ (probe->key, key)) | |
| 1172 break; | |
| 1173 | |
| 1174 if (!HTENTRY_CLEAR_P (probe)) | |
| 1175 probe->value = make_int (XINT (probe->value) + offset); | |
| 1176 else | |
| 1177 { | |
| 1178 probe->key = key; | |
| 1179 probe->value = make_int (offset); | |
| 1180 | |
| 1181 if (++ht->count >= ht->rehash_count) | |
| 1182 enlarge_hash_table (ht); | |
| 1183 } | |
| 1184 } | |
| 1185 | |
| 428 | 1186 DEFUN ("gethash", Fgethash, 2, 3, 0, /* |
| 1187 Find hash value for KEY in HASH-TABLE. | |
| 1188 If there is no corresponding value, return DEFAULT (which defaults to nil). | |
| 1189 */ | |
| 1190 (key, hash_table, default_)) | |
| 1191 { | |
| 442 | 1192 const Lisp_Hash_Table *ht = xhash_table (hash_table); |
| 1204 | 1193 htentry *e = find_htentry (key, ht); |
| 428 | 1194 |
| 1204 | 1195 return HTENTRY_CLEAR_P (e) ? default_ : e->value; |
| 428 | 1196 } |
| 1197 | |
| 1198 DEFUN ("puthash", Fputhash, 3, 3, 0, /* | |
|
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|
1199 Hash KEY to VALUE in HASH-TABLE, and return VALUE. |
| 428 | 1200 */ |
| 1201 (key, value, hash_table)) | |
| 1202 { | |
| 1203 Lisp_Hash_Table *ht = xhash_table (hash_table); | |
| 1204 | 1204 htentry *e = find_htentry (key, ht); |
| 428 | 1205 |
| 1204 | 1206 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1207 return e->value = value; |
| 1208 | |
| 1209 e->key = key; | |
| 1210 e->value = value; | |
| 1211 | |
| 1212 if (++ht->count >= ht->rehash_count) | |
| 1213 enlarge_hash_table (ht); | |
| 1214 | |
| 1215 return value; | |
| 1216 } | |
| 1217 | |
| 1204 | 1218 /* Remove htentry pointed at by PROBE. |
| 428 | 1219 Subsequent entries are removed and reinserted. |
| 1220 We don't use tombstones - too wasteful. */ | |
| 1221 static void | |
| 1204 | 1222 remhash_1 (Lisp_Hash_Table *ht, htentry *entries, htentry *probe) |
| 428 | 1223 { |
| 665 | 1224 Elemcount size = ht->size; |
| 1204 | 1225 CLEAR_HTENTRY (probe); |
| 428 | 1226 probe++; |
| 1227 ht->count--; | |
| 1228 | |
| 1229 LINEAR_PROBING_LOOP (probe, entries, size) | |
| 1230 { | |
| 1231 Lisp_Object key = probe->key; | |
| 1204 | 1232 htentry *probe2 = entries + HASHCODE (key, ht); |
| 428 | 1233 LINEAR_PROBING_LOOP (probe2, entries, size) |
| 1234 if (EQ (probe2->key, key)) | |
| 1204 | 1235 /* htentry at probe doesn't need to move. */ |
| 428 | 1236 goto continue_outer_loop; |
| 1204 | 1237 /* Move htentry from probe to new home at probe2. */ |
| 428 | 1238 *probe2 = *probe; |
| 1204 | 1239 CLEAR_HTENTRY (probe); |
| 428 | 1240 continue_outer_loop: continue; |
| 1241 } | |
| 1242 } | |
| 1243 | |
| 1244 DEFUN ("remhash", Fremhash, 2, 2, 0, /* | |
| 1245 Remove the entry for KEY from HASH-TABLE. | |
| 1246 Do nothing if there is no entry for KEY in HASH-TABLE. | |
| 617 | 1247 Return non-nil if an entry was removed. |
| 428 | 1248 */ |
| 1249 (key, hash_table)) | |
| 1250 { | |
| 1251 Lisp_Hash_Table *ht = xhash_table (hash_table); | |
| 1204 | 1252 htentry *e = find_htentry (key, ht); |
| 428 | 1253 |
| 1204 | 1254 if (HTENTRY_CLEAR_P (e)) |
| 428 | 1255 return Qnil; |
| 1256 | |
| 1257 remhash_1 (ht, ht->hentries, e); | |
| 1258 return Qt; | |
| 1259 } | |
| 1260 | |
| 1261 DEFUN ("clrhash", Fclrhash, 1, 1, 0, /* | |
| 1262 Remove all entries from HASH-TABLE, leaving it empty. | |
|
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|
1263 Return HASH-TABLE. |
| 428 | 1264 */ |
| 1265 (hash_table)) | |
| 1266 { | |
| 1267 Lisp_Hash_Table *ht = xhash_table (hash_table); | |
| 1204 | 1268 htentry *e, *sentinel; |
| 428 | 1269 |
| 1270 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 1271 CLEAR_HTENTRY (e); |
| 428 | 1272 ht->count = 0; |
| 1273 | |
| 1274 return hash_table; | |
| 1275 } | |
| 1276 | |
| 1277 /************************************************************************/ | |
| 1278 /* Accessor Functions */ | |
| 1279 /************************************************************************/ | |
| 1280 | |
| 1281 DEFUN ("hash-table-count", Fhash_table_count, 1, 1, 0, /* | |
| 1282 Return the number of entries in HASH-TABLE. | |
| 1283 */ | |
| 1284 (hash_table)) | |
| 1285 { | |
| 1286 return make_int (xhash_table (hash_table)->count); | |
| 1287 } | |
| 1288 | |
| 1289 DEFUN ("hash-table-test", Fhash_table_test, 1, 1, 0, /* | |
| 1290 Return the test function of HASH-TABLE. | |
| 1291 This can be one of `eq', `eql' or `equal'. | |
| 1292 */ | |
| 1293 (hash_table)) | |
| 1294 { | |
| 1295 hash_table_test_function_t fun = xhash_table (hash_table)->test_function; | |
| 1296 | |
| 1297 return (fun == lisp_object_eql_equal ? Qeql : | |
| 1298 fun == lisp_object_equal_equal ? Qequal : | |
| 1299 Qeq); | |
| 1300 } | |
| 1301 | |
| 1302 DEFUN ("hash-table-size", Fhash_table_size, 1, 1, 0, /* | |
| 1303 Return the size of HASH-TABLE. | |
| 1304 This is the current number of slots in HASH-TABLE, whether occupied or not. | |
| 1305 */ | |
| 1306 (hash_table)) | |
| 1307 { | |
| 1308 return make_int (xhash_table (hash_table)->size); | |
| 1309 } | |
| 1310 | |
| 1311 DEFUN ("hash-table-rehash-size", Fhash_table_rehash_size, 1, 1, 0, /* | |
| 1312 Return the current rehash size of HASH-TABLE. | |
| 1313 This is a float greater than 1.0; the factor by which HASH-TABLE | |
| 1314 is enlarged when the rehash threshold is exceeded. | |
| 1315 */ | |
| 1316 (hash_table)) | |
| 1317 { | |
| 1318 return make_float (xhash_table (hash_table)->rehash_size); | |
| 1319 } | |
| 1320 | |
| 1321 DEFUN ("hash-table-rehash-threshold", Fhash_table_rehash_threshold, 1, 1, 0, /* | |
| 1322 Return the current rehash threshold of HASH-TABLE. | |
| 1323 This is a float between 0.0 and 1.0; the maximum `load factor' of HASH-TABLE, | |
| 1324 beyond which the HASH-TABLE is enlarged by rehashing. | |
| 1325 */ | |
| 1326 (hash_table)) | |
| 1327 { | |
| 438 | 1328 return make_float (xhash_table (hash_table)->rehash_threshold); |
| 428 | 1329 } |
| 1330 | |
| 1331 DEFUN ("hash-table-weakness", Fhash_table_weakness, 1, 1, 0, /* | |
| 1332 Return the weakness of HASH-TABLE. | |
| 442 | 1333 This can be one of `nil', `key-and-value', `key-or-value', `key' or `value'. |
| 428 | 1334 */ |
| 1335 (hash_table)) | |
| 1336 { | |
| 1337 switch (xhash_table (hash_table)->weakness) | |
| 1338 { | |
| 442 | 1339 case HASH_TABLE_WEAK: return Qkey_and_value; |
| 1340 case HASH_TABLE_KEY_WEAK: return Qkey; | |
| 1341 case HASH_TABLE_KEY_VALUE_WEAK: return Qkey_or_value; | |
| 1342 case HASH_TABLE_VALUE_WEAK: return Qvalue; | |
| 1343 default: return Qnil; | |
| 428 | 1344 } |
| 1345 } | |
| 1346 | |
| 1347 /* obsolete as of 19990901 in xemacs-21.2 */ | |
| 1348 DEFUN ("hash-table-type", Fhash_table_type, 1, 1, 0, /* | |
| 1349 Return the type of HASH-TABLE. | |
| 1350 This can be one of `non-weak', `weak', `key-weak' or `value-weak'. | |
| 1351 */ | |
| 1352 (hash_table)) | |
| 1353 { | |
| 1354 switch (xhash_table (hash_table)->weakness) | |
| 1355 { | |
| 442 | 1356 case HASH_TABLE_WEAK: return Qweak; |
| 1357 case HASH_TABLE_KEY_WEAK: return Qkey_weak; | |
| 1358 case HASH_TABLE_KEY_VALUE_WEAK: return Qkey_or_value_weak; | |
| 1359 case HASH_TABLE_VALUE_WEAK: return Qvalue_weak; | |
| 1360 default: return Qnon_weak; | |
| 428 | 1361 } |
| 1362 } | |
| 1363 | |
| 1364 /************************************************************************/ | |
| 1365 /* Mapping Functions */ | |
| 1366 /************************************************************************/ | |
| 489 | 1367 |
| 1368 /* We need to be careful when mapping over hash tables because the | |
| 1369 hash table might be modified during the mapping operation: | |
| 1370 - by the mapping function | |
| 1371 - by gc (if the hash table is weak) | |
| 1372 | |
| 1373 So we make a copy of the hentries at the beginning of the mapping | |
| 497 | 1374 operation, and iterate over the copy. Naturally, this is |
| 1375 expensive, but not as expensive as you might think, because no | |
| 1376 actual memory has to be collected by our notoriously inefficient | |
| 1377 GC; we use an unwind-protect instead to free the memory directly. | |
| 1378 | |
| 1379 We could avoid the copying by having the hash table modifiers | |
| 1380 puthash and remhash check for currently active mapping functions. | |
| 1381 Disadvantages: it's hard to get right, and IMO hash mapping | |
| 1382 functions are basically rare, and no extra space in the hash table | |
| 1383 object and no extra cpu in puthash or remhash should be wasted to | |
| 1384 make maphash 3% faster. From a design point of view, the basic | |
| 1385 functions gethash, puthash and remhash should be implementable | |
| 1386 without having to think about maphash. | |
| 1387 | |
| 1388 Note: We don't (yet) have Common Lisp's with-hash-table-iterator. | |
| 1389 If you implement this naively, you cannot have more than one | |
| 1390 concurrently active iterator over the same hash table. The `each' | |
| 1391 function in perl has this limitation. | |
| 1392 | |
| 1393 Note: We GCPRO memory on the heap, not on the stack. There is no | |
| 1394 obvious reason why this is bad, but as of this writing this is the | |
| 1395 only known occurrence of this technique in the code. | |
| 504 | 1396 |
| 1397 -- Martin | |
| 1398 */ | |
| 1399 | |
| 1400 /* Ben disagrees with the "copying hentries" design, and says: | |
| 1401 | |
| 1402 Another solution is the same as I've already proposed -- when | |
| 1403 mapping, mark the table as "change-unsafe", and in this case, use a | |
| 1404 secondary table to maintain changes. this could be basically a | |
| 1405 standard hash table, but with entries only for added or deleted | |
| 1406 entries in the primary table, and a marker like Qunbound to | |
| 1407 indicate a deleted entry. puthash, gethash and remhash need a | |
| 1408 single extra check for this secondary table -- totally | |
| 1409 insignificant speedwise. if you really cared about making | |
| 1410 recursive maphashes completely correct, you'd have to do a bit of | |
| 1411 extra work here -- when maphashing, if the secondary table exists, | |
| 1412 make a copy of it, and use the copy in conjunction with the primary | |
| 1413 table when mapping. the advantages of this are | |
| 1414 | |
| 1415 [a] easy to demonstrate correct, even with weak hashtables. | |
| 1416 | |
| 1417 [b] no extra overhead in the general maphash case -- only when you | |
| 1418 modify the table while maphashing, and even then the overhead is | |
| 1419 very small. | |
| 497 | 1420 */ |
| 1421 | |
| 489 | 1422 static Lisp_Object |
| 1423 maphash_unwind (Lisp_Object unwind_obj) | |
| 1424 { | |
| 1425 void *ptr = (void *) get_opaque_ptr (unwind_obj); | |
|
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|
1426 xfree (ptr); |
| 489 | 1427 free_opaque_ptr (unwind_obj); |
| 1428 return Qnil; | |
| 1429 } | |
| 1430 | |
| 1431 /* Return a malloced array of alternating key/value pairs from HT. */ | |
| 1432 static Lisp_Object * | |
| 1433 copy_compress_hentries (const Lisp_Hash_Table *ht) | |
| 1434 { | |
| 1435 Lisp_Object * const objs = | |
| 1436 /* If the hash table is empty, ht->count could be 0. */ | |
| 1437 xnew_array (Lisp_Object, 2 * (ht->count > 0 ? ht->count : 1)); | |
| 1204 | 1438 const htentry *e, *sentinel; |
| 489 | 1439 Lisp_Object *pobj; |
| 1440 | |
| 1441 for (e = ht->hentries, sentinel = e + ht->size, pobj = objs; e < sentinel; e++) | |
| 1204 | 1442 if (!HTENTRY_CLEAR_P (e)) |
| 489 | 1443 { |
| 1444 *(pobj++) = e->key; | |
| 1445 *(pobj++) = e->value; | |
| 1446 } | |
| 1447 | |
| 1448 type_checking_assert (pobj == objs + 2 * ht->count); | |
| 1449 | |
| 1450 return objs; | |
| 1451 } | |
| 1452 | |
| 428 | 1453 DEFUN ("maphash", Fmaphash, 2, 2, 0, /* |
| 1454 Map FUNCTION over entries in HASH-TABLE, calling it with two args, | |
| 1455 each key and value in HASH-TABLE. | |
| 1456 | |
| 489 | 1457 FUNCTION must not modify HASH-TABLE, with the one exception that FUNCTION |
| 428 | 1458 may remhash or puthash the entry currently being processed by FUNCTION. |
| 1459 */ | |
| 1460 (function, hash_table)) | |
| 1461 { | |
| 489 | 1462 const Lisp_Hash_Table * const ht = xhash_table (hash_table); |
| 1463 Lisp_Object * const objs = copy_compress_hentries (ht); | |
| 1464 Lisp_Object args[3]; | |
| 1465 const Lisp_Object *pobj, *end; | |
| 1466 int speccount = specpdl_depth (); | |
| 1467 struct gcpro gcpro1; | |
| 1468 | |
| 1469 record_unwind_protect (maphash_unwind, make_opaque_ptr ((void *)objs)); | |
| 1470 GCPRO1 (objs[0]); | |
| 1471 gcpro1.nvars = 2 * ht->count; | |
| 428 | 1472 |
| 489 | 1473 args[0] = function; |
| 1474 | |
| 1475 for (pobj = objs, end = pobj + 2 * ht->count; pobj < end; pobj += 2) | |
| 1476 { | |
| 1477 args[1] = pobj[0]; | |
| 1478 args[2] = pobj[1]; | |
| 1479 Ffuncall (countof (args), args); | |
| 1480 } | |
| 1481 | |
| 771 | 1482 unbind_to (speccount); |
| 489 | 1483 UNGCPRO; |
| 428 | 1484 |
| 1485 return Qnil; | |
| 1486 } | |
| 1487 | |
| 489 | 1488 /* Map *C* function FUNCTION over the elements of a non-weak lisp hash table. |
| 1489 FUNCTION must not modify HASH-TABLE, with the one exception that FUNCTION | |
| 1490 may puthash the entry currently being processed by FUNCTION. | |
| 1491 Mapping terminates if FUNCTION returns something other than 0. */ | |
| 428 | 1492 void |
| 489 | 1493 elisp_maphash_unsafe (maphash_function_t function, |
| 428 | 1494 Lisp_Object hash_table, void *extra_arg) |
| 1495 { | |
| 442 | 1496 const Lisp_Hash_Table *ht = XHASH_TABLE (hash_table); |
| 1204 | 1497 const htentry *e, *sentinel; |
| 428 | 1498 |
| 1499 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 1500 if (!HTENTRY_CLEAR_P (e)) |
| 489 | 1501 if (function (e->key, e->value, extra_arg)) |
| 1502 return; | |
| 428 | 1503 } |
| 1504 | |
| 489 | 1505 /* Map *C* function FUNCTION over the elements of a lisp hash table. |
| 1506 It is safe for FUNCTION to modify HASH-TABLE. | |
| 1507 Mapping terminates if FUNCTION returns something other than 0. */ | |
| 1508 void | |
| 1509 elisp_maphash (maphash_function_t function, | |
| 1510 Lisp_Object hash_table, void *extra_arg) | |
| 1511 { | |
| 1512 const Lisp_Hash_Table * const ht = xhash_table (hash_table); | |
| 1513 Lisp_Object * const objs = copy_compress_hentries (ht); | |
| 1514 const Lisp_Object *pobj, *end; | |
| 1515 int speccount = specpdl_depth (); | |
| 1516 struct gcpro gcpro1; | |
| 1517 | |
| 1518 record_unwind_protect (maphash_unwind, make_opaque_ptr ((void *)objs)); | |
| 1519 GCPRO1 (objs[0]); | |
| 1520 gcpro1.nvars = 2 * ht->count; | |
| 1521 | |
| 1522 for (pobj = objs, end = pobj + 2 * ht->count; pobj < end; pobj += 2) | |
| 1523 if (function (pobj[0], pobj[1], extra_arg)) | |
| 1524 break; | |
| 1525 | |
| 771 | 1526 unbind_to (speccount); |
| 489 | 1527 UNGCPRO; |
| 1528 } | |
| 1529 | |
| 1530 /* Remove all elements of a lisp hash table satisfying *C* predicate PREDICATE. | |
| 1531 PREDICATE must not modify HASH-TABLE. */ | |
| 428 | 1532 void |
| 1533 elisp_map_remhash (maphash_function_t predicate, | |
| 1534 Lisp_Object hash_table, void *extra_arg) | |
| 1535 { | |
| 489 | 1536 const Lisp_Hash_Table * const ht = xhash_table (hash_table); |
| 1537 Lisp_Object * const objs = copy_compress_hentries (ht); | |
| 1538 const Lisp_Object *pobj, *end; | |
| 1539 int speccount = specpdl_depth (); | |
| 1540 struct gcpro gcpro1; | |
| 428 | 1541 |
| 489 | 1542 record_unwind_protect (maphash_unwind, make_opaque_ptr ((void *)objs)); |
| 1543 GCPRO1 (objs[0]); | |
| 1544 gcpro1.nvars = 2 * ht->count; | |
| 1545 | |
| 1546 for (pobj = objs, end = pobj + 2 * ht->count; pobj < end; pobj += 2) | |
| 1547 if (predicate (pobj[0], pobj[1], extra_arg)) | |
| 1548 Fremhash (pobj[0], hash_table); | |
| 1549 | |
| 771 | 1550 unbind_to (speccount); |
| 489 | 1551 UNGCPRO; |
| 428 | 1552 } |
| 1553 | |
| 1554 | |
| 1555 /************************************************************************/ | |
| 1556 /* garbage collecting weak hash tables */ | |
| 1557 /************************************************************************/ | |
| 1598 | 1558 #ifdef USE_KKCC |
| 2645 | 1559 #define MARK_OBJ(obj) do { \ |
| 1560 Lisp_Object mo_obj = (obj); \ | |
| 1561 if (!marked_p (mo_obj)) \ | |
| 1562 { \ | |
| 1563 kkcc_gc_stack_push_lisp_object (mo_obj, 0, -1); \ | |
| 1564 did_mark = 1; \ | |
| 1565 } \ | |
| 1598 | 1566 } while (0) |
| 1567 | |
| 1568 #else /* NO USE_KKCC */ | |
| 1569 | |
| 442 | 1570 #define MARK_OBJ(obj) do { \ |
| 1571 Lisp_Object mo_obj = (obj); \ | |
| 1572 if (!marked_p (mo_obj)) \ | |
| 1573 { \ | |
| 1574 mark_object (mo_obj); \ | |
| 1575 did_mark = 1; \ | |
| 1576 } \ | |
| 1577 } while (0) | |
| 1598 | 1578 #endif /*NO USE_KKCC */ |
| 442 | 1579 |
| 428 | 1580 |
| 1581 /* Complete the marking for semi-weak hash tables. */ | |
| 1582 int | |
| 1583 finish_marking_weak_hash_tables (void) | |
| 1584 { | |
| 1585 Lisp_Object hash_table; | |
| 1586 int did_mark = 0; | |
| 1587 | |
| 1588 for (hash_table = Vall_weak_hash_tables; | |
| 1589 !NILP (hash_table); | |
| 1590 hash_table = XHASH_TABLE (hash_table)->next_weak) | |
| 1591 { | |
| 442 | 1592 const Lisp_Hash_Table *ht = XHASH_TABLE (hash_table); |
| 1204 | 1593 const htentry *e = ht->hentries; |
| 1594 const htentry *sentinel = e + ht->size; | |
| 428 | 1595 |
| 1596 if (! marked_p (hash_table)) | |
| 1597 /* The hash table is probably garbage. Ignore it. */ | |
| 1598 continue; | |
| 1599 | |
| 1600 /* Now, scan over all the pairs. For all pairs that are | |
| 1601 half-marked, we may need to mark the other half if we're | |
| 1602 keeping this pair. */ | |
| 1603 switch (ht->weakness) | |
| 1604 { | |
| 1605 case HASH_TABLE_KEY_WEAK: | |
| 1606 for (; e < sentinel; e++) | |
| 1204 | 1607 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1608 if (marked_p (e->key)) |
| 1609 MARK_OBJ (e->value); | |
| 1610 break; | |
| 1611 | |
| 1612 case HASH_TABLE_VALUE_WEAK: | |
| 1613 for (; e < sentinel; e++) | |
| 1204 | 1614 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1615 if (marked_p (e->value)) |
| 1616 MARK_OBJ (e->key); | |
| 1617 break; | |
| 1618 | |
| 442 | 1619 case HASH_TABLE_KEY_VALUE_WEAK: |
| 1620 for (; e < sentinel; e++) | |
| 1204 | 1621 if (!HTENTRY_CLEAR_P (e)) |
| 442 | 1622 { |
| 1623 if (marked_p (e->value)) | |
| 1624 MARK_OBJ (e->key); | |
| 1625 else if (marked_p (e->key)) | |
| 1626 MARK_OBJ (e->value); | |
| 1627 } | |
| 1628 break; | |
| 1629 | |
| 428 | 1630 case HASH_TABLE_KEY_CAR_WEAK: |
| 1631 for (; e < sentinel; e++) | |
| 1204 | 1632 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1633 if (!CONSP (e->key) || marked_p (XCAR (e->key))) |
| 1634 { | |
| 1635 MARK_OBJ (e->key); | |
| 1636 MARK_OBJ (e->value); | |
| 1637 } | |
| 1638 break; | |
| 1639 | |
| 450 | 1640 /* We seem to be sprouting new weakness types at an alarming |
| 1641 rate. At least this is not externally visible - and in | |
| 1642 fact all of these KEY_CAR_* types are only used by the | |
| 1643 glyph code. */ | |
| 1644 case HASH_TABLE_KEY_CAR_VALUE_WEAK: | |
| 1645 for (; e < sentinel; e++) | |
| 1204 | 1646 if (!HTENTRY_CLEAR_P (e)) |
| 450 | 1647 { |
| 1648 if (!CONSP (e->key) || marked_p (XCAR (e->key))) | |
| 1649 { | |
| 1650 MARK_OBJ (e->key); | |
| 1651 MARK_OBJ (e->value); | |
| 1652 } | |
| 1653 else if (marked_p (e->value)) | |
| 1654 MARK_OBJ (e->key); | |
| 1655 } | |
| 1656 break; | |
| 1657 | |
| 428 | 1658 case HASH_TABLE_VALUE_CAR_WEAK: |
| 1659 for (; e < sentinel; e++) | |
| 1204 | 1660 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1661 if (!CONSP (e->value) || marked_p (XCAR (e->value))) |
| 1662 { | |
| 1663 MARK_OBJ (e->key); | |
| 1664 MARK_OBJ (e->value); | |
| 1665 } | |
| 1666 break; | |
| 1667 | |
| 1668 default: | |
| 1669 break; | |
| 1670 } | |
| 1671 } | |
| 1672 | |
| 1673 return did_mark; | |
| 1674 } | |
| 1675 | |
| 1676 void | |
| 1677 prune_weak_hash_tables (void) | |
| 1678 { | |
| 1679 Lisp_Object hash_table, prev = Qnil; | |
| 1680 for (hash_table = Vall_weak_hash_tables; | |
| 1681 !NILP (hash_table); | |
| 1682 hash_table = XHASH_TABLE (hash_table)->next_weak) | |
| 1683 { | |
| 1684 if (! marked_p (hash_table)) | |
| 1685 { | |
| 1686 /* This hash table itself is garbage. Remove it from the list. */ | |
| 1687 if (NILP (prev)) | |
| 1688 Vall_weak_hash_tables = XHASH_TABLE (hash_table)->next_weak; | |
| 1689 else | |
| 1690 XHASH_TABLE (prev)->next_weak = XHASH_TABLE (hash_table)->next_weak; | |
| 1691 } | |
| 1692 else | |
| 1693 { | |
| 1694 /* Now, scan over all the pairs. Remove all of the pairs | |
| 1695 in which the key or value, or both, is unmarked | |
| 1696 (depending on the weakness of the hash table). */ | |
| 1697 Lisp_Hash_Table *ht = XHASH_TABLE (hash_table); | |
| 1204 | 1698 htentry *entries = ht->hentries; |
| 1699 htentry *sentinel = entries + ht->size; | |
| 1700 htentry *e; | |
| 428 | 1701 |
| 1702 for (e = entries; e < sentinel; e++) | |
| 1204 | 1703 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1704 { |
| 1705 again: | |
| 1706 if (!marked_p (e->key) || !marked_p (e->value)) | |
| 1707 { | |
| 1708 remhash_1 (ht, entries, e); | |
| 1204 | 1709 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1710 goto again; |
| 1711 } | |
| 1712 } | |
| 1713 | |
| 1714 prev = hash_table; | |
| 1715 } | |
| 1716 } | |
| 1717 } | |
| 1718 | |
| 1719 /* Return a hash value for an array of Lisp_Objects of size SIZE. */ | |
| 1720 | |
| 665 | 1721 Hashcode |
| 428 | 1722 internal_array_hash (Lisp_Object *arr, int size, int depth) |
| 1723 { | |
| 1724 int i; | |
| 665 | 1725 Hashcode hash = 0; |
| 442 | 1726 depth++; |
| 428 | 1727 |
| 1728 if (size <= 5) | |
| 1729 { | |
| 1730 for (i = 0; i < size; i++) | |
| 442 | 1731 hash = HASH2 (hash, internal_hash (arr[i], depth)); |
| 428 | 1732 return hash; |
| 1733 } | |
| 1734 | |
| 1735 /* just pick five elements scattered throughout the array. | |
| 1736 A slightly better approach would be to offset by some | |
| 1737 noise factor from the points chosen below. */ | |
| 1738 for (i = 0; i < 5; i++) | |
| 442 | 1739 hash = HASH2 (hash, internal_hash (arr[i*size/5], depth)); |
| 428 | 1740 |
| 1741 return hash; | |
| 1742 } | |
| 1743 | |
| 1744 /* Return a hash value for a Lisp_Object. This is for use when hashing | |
| 1745 objects with the comparison being `equal' (for `eq', you can just | |
| 1746 use the Lisp_Object itself as the hash value). You need to make a | |
| 1747 tradeoff between the speed of the hash function and how good the | |
| 1748 hashing is. In particular, the hash function needs to be FAST, | |
| 1749 so you can't just traipse down the whole tree hashing everything | |
| 1750 together. Most of the time, objects will differ in the first | |
| 1751 few elements you hash. Thus, we only go to a short depth (5) | |
| 1752 and only hash at most 5 elements out of a vector. Theoretically | |
| 1753 we could still take 5^5 time (a big big number) to compute a | |
| 1754 hash, but practically this won't ever happen. */ | |
| 1755 | |
| 665 | 1756 Hashcode |
| 428 | 1757 internal_hash (Lisp_Object obj, int depth) |
| 1758 { | |
| 1759 if (depth > 5) | |
| 1760 return 0; | |
|
4398
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|
1761 |
|
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|
1762 if (CONSP(obj)) |
| 428 | 1763 { |
|
4398
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parents:
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diff
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|
1764 Hashcode hash, h; |
|
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Have list hashes depend on the order of the contents, as is the case for vectors.
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|
1765 int s; |
|
479443c0f95a
Have list hashes depend on the order of the contents, as is the case for vectors.
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|
1766 |
|
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|
1767 depth += 1; |
|
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|
1768 |
|
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|
1769 if (!CONSP(XCDR(obj))) |
|
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Have list hashes depend on the order of the contents, as is the case for vectors.
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parents:
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|
1770 { |
|
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parents:
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|
1771 /* special case for '(a . b) conses */ |
|
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|
1772 return HASH2(internal_hash(XCAR(obj), depth), |
|
479443c0f95a
Have list hashes depend on the order of the contents, as is the case for vectors.
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diff
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|
1773 internal_hash(XCDR(obj), depth)); |
|
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|
1774 } |
|
479443c0f95a
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parents:
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changeset
|
1775 |
|
479443c0f95a
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parents:
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diff
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|
1776 /* Don't simply tail recurse; we want to hash lists with the |
|
479443c0f95a
Have list hashes depend on the order of the contents, as is the case for vectors.
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diff
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|
1777 same contents in distinct orders differently. */ |
|
479443c0f95a
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parents:
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diff
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|
1778 hash = internal_hash(XCAR(obj), depth); |
|
479443c0f95a
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changeset
|
1779 |
|
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|
1780 obj = XCDR(obj); |
|
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|
1781 for (s = 1; s < 6 && CONSP(obj); obj = XCDR(obj), s++) |
|
479443c0f95a
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|
1782 { |
|
479443c0f95a
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|
1783 h = internal_hash(XCAR(obj), depth); |
|
479443c0f95a
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parents:
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|
1784 hash = HASH3(hash, h, s); |
|
479443c0f95a
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|
1785 } |
|
479443c0f95a
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|
1786 |
|
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|
1787 return hash; |
| 428 | 1788 } |
| 1789 if (STRINGP (obj)) | |
| 1790 { | |
| 1791 return hash_string (XSTRING_DATA (obj), XSTRING_LENGTH (obj)); | |
| 1792 } | |
| 1793 if (LRECORDP (obj)) | |
| 1794 { | |
| 442 | 1795 const struct lrecord_implementation |
| 428 | 1796 *imp = XRECORD_LHEADER_IMPLEMENTATION (obj); |
| 1797 if (imp->hash) | |
| 1798 return imp->hash (obj, depth); | |
| 1799 } | |
| 1800 | |
| 1801 return LISP_HASH (obj); | |
| 1802 } | |
| 1803 | |
| 1804 DEFUN ("sxhash", Fsxhash, 1, 1, 0, /* | |
| 1805 Return a hash value for OBJECT. | |
| 444 | 1806 \(equal obj1 obj2) implies (= (sxhash obj1) (sxhash obj2)). |
| 428 | 1807 */ |
| 1808 (object)) | |
| 1809 { | |
| 1810 return make_int (internal_hash (object, 0)); | |
| 1811 } | |
| 1812 | |
| 1813 #if 0 | |
| 826 | 1814 DEFUN ("internal-hash-value", Finternal_hash_value, 1, 1, 0, /* |
| 428 | 1815 Hash value of OBJECT. For debugging. |
| 1816 The value is returned as (HIGH . LOW). | |
| 1817 */ | |
| 1818 (object)) | |
| 1819 { | |
| 1820 /* This function is pretty 32bit-centric. */ | |
| 665 | 1821 Hashcode hash = internal_hash (object, 0); |
| 428 | 1822 return Fcons (hash >> 16, hash & 0xffff); |
| 1823 } | |
| 1824 #endif | |
| 1825 | |
| 1826 | |
| 1827 /************************************************************************/ | |
| 1828 /* initialization */ | |
| 1829 /************************************************************************/ | |
| 1830 | |
| 1831 void | |
| 1832 syms_of_elhash (void) | |
| 1833 { | |
| 1834 DEFSUBR (Fhash_table_p); | |
| 1835 DEFSUBR (Fmake_hash_table); | |
| 1836 DEFSUBR (Fcopy_hash_table); | |
| 1837 DEFSUBR (Fgethash); | |
| 1838 DEFSUBR (Fremhash); | |
| 1839 DEFSUBR (Fputhash); | |
| 1840 DEFSUBR (Fclrhash); | |
| 1841 DEFSUBR (Fmaphash); | |
| 1842 DEFSUBR (Fhash_table_count); | |
| 1843 DEFSUBR (Fhash_table_test); | |
| 1844 DEFSUBR (Fhash_table_size); | |
| 1845 DEFSUBR (Fhash_table_rehash_size); | |
| 1846 DEFSUBR (Fhash_table_rehash_threshold); | |
| 1847 DEFSUBR (Fhash_table_weakness); | |
| 1848 DEFSUBR (Fhash_table_type); /* obsolete */ | |
| 1849 DEFSUBR (Fsxhash); | |
| 1850 #if 0 | |
| 1851 DEFSUBR (Finternal_hash_value); | |
| 1852 #endif | |
| 1853 | |
| 563 | 1854 DEFSYMBOL_MULTIWORD_PREDICATE (Qhash_tablep); |
| 1855 DEFSYMBOL (Qhash_table); | |
| 1856 DEFSYMBOL (Qhashtable); | |
| 1857 DEFSYMBOL (Qweakness); | |
| 1858 DEFSYMBOL (Qvalue); | |
| 1859 DEFSYMBOL (Qkey_or_value); | |
| 1860 DEFSYMBOL (Qkey_and_value); | |
| 1861 DEFSYMBOL (Qrehash_size); | |
| 1862 DEFSYMBOL (Qrehash_threshold); | |
| 428 | 1863 |
| 563 | 1864 DEFSYMBOL (Qweak); /* obsolete */ |
| 1865 DEFSYMBOL (Qkey_weak); /* obsolete */ | |
| 1866 DEFSYMBOL (Qkey_or_value_weak); /* obsolete */ | |
| 1867 DEFSYMBOL (Qvalue_weak); /* obsolete */ | |
| 1868 DEFSYMBOL (Qnon_weak); /* obsolete */ | |
| 428 | 1869 |
|
4820
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|
1870 DEFKEYWORD (Q_data); |
| 563 | 1871 DEFKEYWORD (Q_test); |
| 1872 DEFKEYWORD (Q_size); | |
| 1873 DEFKEYWORD (Q_rehash_size); | |
| 1874 DEFKEYWORD (Q_rehash_threshold); | |
| 1875 DEFKEYWORD (Q_weakness); | |
| 1876 DEFKEYWORD (Q_type); /* obsolete */ | |
| 428 | 1877 } |
| 1878 | |
| 1879 void | |
| 771 | 1880 init_elhash_once_early (void) |
| 428 | 1881 { |
| 771 | 1882 INIT_LRECORD_IMPLEMENTATION (hash_table); |
| 3092 | 1883 #ifdef NEW_GC |
| 1884 INIT_LRECORD_IMPLEMENTATION (hash_table_entry); | |
| 1885 #endif /* NEW_GC */ | |
| 771 | 1886 |
| 428 | 1887 /* This must NOT be staticpro'd */ |
| 1888 Vall_weak_hash_tables = Qnil; | |
| 452 | 1889 dump_add_weak_object_chain (&Vall_weak_hash_tables); |
| 428 | 1890 } |