Mercurial > hg > xemacs-beta
annotate src/elhash.c @ 5273:799742b751c8
Accept circular lists where that is useful in #'mapcar*, #'map* and friends.
src/ChangeLog addition:
2010-09-16 Aidan Kehoe <kehoea@parhasard.net>
* fns.c (Flist_length): New, moved here from cl-extra.el, needed
by the next function.
(shortest_length_among_sequences): New.
(Fmapconcat, FmapcarX, Fmapvector, Fmapcan, Fmapc, Fmap)
(Fmap_into, Fsome, Fevery):
Use shortest_length_among_sequences() when working out how many
iterations to do, only giving circular list errors if all
arguments are circular.
| author | Aidan Kehoe <kehoea@parhasard.net> |
|---|---|
| date | Thu, 16 Sep 2010 20:34:49 +0100 |
| parents | 33899241a6a8 |
| children | d804e621add0 |
| rev | line source |
|---|---|
| 428 | 1 /* Implementation of the hash table lisp object type. |
| 2 Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc. | |
|
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3 Copyright (C) 1995, 1996, 2002, 2004, 2010 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 | |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 428 | 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" | |
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84 #include "gc.h" |
| 489 | 85 #include "opaque.h" |
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86 #include "buffer.h" |
| 428 | 87 |
| 88 Lisp_Object Qhash_tablep; | |
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89 Lisp_Object Qeq, Qeql, Qequal, Qequalp; |
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90 Lisp_Object Qeq_hash, Qeql_hash, Qequal_hash, Qequalp_hash; |
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91 |
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92 static Lisp_Object Qhashtable, Qhash_table, Qmake_hash_table; |
| 442 | 93 static Lisp_Object Qweakness, Qvalue, Qkey_or_value, Qkey_and_value; |
| 428 | 94 static Lisp_Object Vall_weak_hash_tables; |
| 95 static Lisp_Object Qrehash_size, Qrehash_threshold; | |
| 96 static Lisp_Object Q_size, Q_test, Q_weakness, Q_rehash_size, Q_rehash_threshold; | |
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97 static Lisp_Object Vhash_table_test_eq, Vhash_table_test_eql; |
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98 static Lisp_Object Vhash_table_test_weak_list; |
| 428 | 99 |
| 100 /* obsolete as of 19990901 in xemacs-21.2 */ | |
| 442 | 101 static Lisp_Object Qweak, Qkey_weak, Qvalue_weak, Qkey_or_value_weak; |
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102 static Lisp_Object Qnon_weak; |
| 428 | 103 |
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104 /* A hash table test, with its associated hash function. equal_function may |
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105 call lisp_equal_function, and hash_function similarly may call |
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106 lisp_hash_function. */ |
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107 struct Hash_Table_Test |
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108 { |
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109 NORMAL_LISP_OBJECT_HEADER header; |
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110 Lisp_Object name; |
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111 hash_table_equal_function_t equal_function; |
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112 hash_table_hash_function_t hash_function; |
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113 Lisp_Object lisp_equal_function; |
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114 Lisp_Object lisp_hash_function; |
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115 }; |
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116 |
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117 static Lisp_Object |
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118 mark_hash_table_test (Lisp_Object obj) |
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119 { |
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120 Hash_Table_Test *http = XHASH_TABLE_TEST (obj); |
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121 |
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122 mark_object (http->name); |
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123 mark_object (http->lisp_equal_function); |
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124 mark_object (http->lisp_hash_function); |
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125 |
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126 return Qnil; |
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127 } |
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128 |
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129 static const struct memory_description hash_table_test_description_1[] = |
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130 { |
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131 { XD_LISP_OBJECT, offsetof (struct Hash_Table_Test, name) }, |
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132 { XD_LISP_OBJECT, offsetof (struct Hash_Table_Test, lisp_equal_function) }, |
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133 { XD_LISP_OBJECT, offsetof (struct Hash_Table_Test, lisp_hash_function) }, |
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134 { XD_END } |
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135 }; |
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136 |
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137 static const struct sized_memory_description hash_table_test_description = |
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138 { |
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139 sizeof (struct Hash_Table_Test), |
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140 hash_table_test_description_1 |
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141 }; |
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142 |
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143 DEFINE_DUMPABLE_INTERNAL_LISP_OBJECT ("hash-table-test", hash_table_test, |
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144 mark_hash_table_test, |
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145 hash_table_test_description_1, |
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146 Hash_Table_Test); |
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147 /* A hash table. */ |
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148 |
| 428 | 149 struct Lisp_Hash_Table |
| 150 { | |
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151 NORMAL_LISP_OBJECT_HEADER header; |
| 665 | 152 Elemcount size; |
| 153 Elemcount count; | |
| 154 Elemcount rehash_count; | |
| 428 | 155 double rehash_size; |
| 156 double rehash_threshold; | |
| 665 | 157 Elemcount golden_ratio; |
| 1204 | 158 htentry *hentries; |
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159 Lisp_Object test; |
| 428 | 160 enum hash_table_weakness weakness; |
| 161 Lisp_Object next_weak; /* Used to chain together all of the weak | |
| 162 hash tables. Don't mark through this. */ | |
| 163 }; | |
| 164 | |
| 1204 | 165 #define CLEAR_HTENTRY(htentry) \ |
| 166 ((*(EMACS_UINT*)(&((htentry)->key))) = 0, \ | |
| 167 (*(EMACS_UINT*)(&((htentry)->value))) = 0) | |
| 428 | 168 |
| 169 #define HASH_TABLE_DEFAULT_SIZE 16 | |
| 170 #define HASH_TABLE_DEFAULT_REHASH_SIZE 1.3 | |
| 171 #define HASH_TABLE_MIN_SIZE 10 | |
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172 #define HASH_TABLE_DEFAULT_REHASH_THRESHOLD(size, test) \ |
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173 (((size) > 4096 && EQ (Vhash_table_test_eq, test)) ? 0.7 : 0.6) |
| 428 | 174 |
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175 #define HASHCODE(key, ht, http) \ |
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176 ((((!EQ (Vhash_table_test_eq, ht->test)) ? \ |
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177 (http)->hash_function (http, key) : \ |
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178 LISP_HASH (key)) * (ht)->golden_ratio) % (ht)->size) |
| 428 | 179 |
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180 #define KEYS_EQUAL_P(key1, key2, test, http) \ |
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181 (EQ (key1, key2) || ((!EQ (Vhash_table_test_eq, test) && \ |
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182 (http->equal_function) (http, key1, key2)))) |
| 428 | 183 |
| 184 #define LINEAR_PROBING_LOOP(probe, entries, size) \ | |
| 185 for (; \ | |
| 1204 | 186 !HTENTRY_CLEAR_P (probe) || \ |
| 428 | 187 (probe == entries + size ? \ |
| 1204 | 188 (probe = entries, !HTENTRY_CLEAR_P (probe)) : 0); \ |
| 428 | 189 probe++) |
| 190 | |
| 800 | 191 #ifdef ERROR_CHECK_STRUCTURES |
| 428 | 192 static void |
| 193 check_hash_table_invariants (Lisp_Hash_Table *ht) | |
| 194 { | |
| 195 assert (ht->count < ht->size); | |
| 196 assert (ht->count <= ht->rehash_count); | |
| 197 assert (ht->rehash_count < ht->size); | |
| 198 assert ((double) ht->count * ht->rehash_threshold - 1 <= (double) ht->rehash_count); | |
| 1204 | 199 assert (HTENTRY_CLEAR_P (ht->hentries + ht->size)); |
| 428 | 200 } |
| 201 #else | |
| 202 #define check_hash_table_invariants(ht) | |
| 203 #endif | |
| 204 | |
| 205 /* Return a suitable size for a hash table, with at least SIZE slots. */ | |
| 665 | 206 static Elemcount |
| 207 hash_table_size (Elemcount requested_size) | |
| 428 | 208 { |
| 209 /* Return some prime near, but greater than or equal to, SIZE. | |
| 210 Decades from the time of writing, someone will have a system large | |
| 211 enough that the list below will be too short... */ | |
| 665 | 212 static const Elemcount primes [] = |
| 428 | 213 { |
| 214 19, 29, 41, 59, 79, 107, 149, 197, 263, 347, 457, 599, 787, 1031, | |
| 215 1361, 1777, 2333, 3037, 3967, 5167, 6719, 8737, 11369, 14783, | |
| 216 19219, 24989, 32491, 42257, 54941, 71429, 92861, 120721, 156941, | |
| 217 204047, 265271, 344857, 448321, 582821, 757693, 985003, 1280519, | |
| 218 1664681, 2164111, 2813353, 3657361, 4754591, 6180989, 8035301, | |
| 219 10445899, 13579681, 17653589, 22949669, 29834603, 38784989, | |
| 220 50420551, 65546729, 85210757, 110774011, 144006217, 187208107, | |
| 221 243370577, 316381771, 411296309, 534685237, 695090819, 903618083, | |
| 647 | 222 1174703521, 1527114613, 1985248999 /* , 2580823717UL, 3355070839UL */ |
| 428 | 223 }; |
| 224 /* We've heard of binary search. */ | |
| 225 int low, high; | |
| 226 for (low = 0, high = countof (primes) - 1; high - low > 1;) | |
| 227 { | |
| 228 /* Loop Invariant: size < primes [high] */ | |
| 229 int mid = (low + high) / 2; | |
| 230 if (primes [mid] < requested_size) | |
| 231 low = mid; | |
| 232 else | |
| 233 high = mid; | |
| 234 } | |
| 235 return primes [high]; | |
| 236 } | |
| 237 | |
| 238 | |
| 239 | |
| 240 static int | |
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241 lisp_object_eql_equal (const Hash_Table_Test *UNUSED (http), Lisp_Object obj1, |
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242 Lisp_Object obj2) |
| 428 | 243 { |
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244 return EQ (obj1, obj2) || |
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245 (NON_FIXNUM_NUMBER_P (obj1) && internal_equal (obj1, obj2, 0)); |
| 428 | 246 } |
| 247 | |
| 665 | 248 static Hashcode |
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249 lisp_object_eql_hash (const Hash_Table_Test *UNUSED (http), Lisp_Object obj) |
| 428 | 250 { |
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251 return NON_FIXNUM_NUMBER_P (obj) ? |
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252 internal_hash (obj, 0, 0) : LISP_HASH (obj); |
| 428 | 253 } |
| 254 | |
| 255 static int | |
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256 lisp_object_equal_equal (const Hash_Table_Test *UNUSED (http), |
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257 Lisp_Object obj1, Lisp_Object obj2) |
| 428 | 258 { |
| 259 return internal_equal (obj1, obj2, 0); | |
| 260 } | |
| 261 | |
| 665 | 262 static Hashcode |
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263 lisp_object_equal_hash (const Hash_Table_Test *UNUSED (http), Lisp_Object obj) |
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264 { |
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265 return internal_hash (obj, 0, 0); |
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266 } |
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267 |
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268 static Hashcode |
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269 lisp_object_equalp_hash (const Hash_Table_Test *UNUSED (http), Lisp_Object obj) |
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270 { |
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271 return internal_hash (obj, 0, 1); |
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272 } |
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273 |
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274 static int |
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275 lisp_object_equalp_equal (const Hash_Table_Test *UNUSED (http), |
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276 Lisp_Object obj1, Lisp_Object obj2) |
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277 { |
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278 return internal_equalp (obj1, obj2, 0); |
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279 } |
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280 |
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281 static Hashcode |
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282 lisp_object_general_hash (const Hash_Table_Test *http, Lisp_Object obj) |
| 428 | 283 { |
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284 struct gcpro gcpro1; |
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285 Lisp_Object args[2] = { http->lisp_hash_function, obj }, res; |
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286 |
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287 /* Make sure any weakly referenced objects don't get collected before the |
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288 funcall: */ |
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289 GCPRO1 (args[0]); |
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290 gcpro1.nvars = countof (args); |
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291 res = IGNORE_MULTIPLE_VALUES (Ffuncall (countof (args), args)); |
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292 UNGCPRO; |
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293 |
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294 if (INTP (res)) |
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295 { |
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296 return (Hashcode) (XINT (res)); |
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297 } |
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298 |
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299 #ifdef HAVE_BIGNUM |
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300 if (BIGNUMP (res)) |
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301 { |
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302 if (bignum_fits_emacs_int_p (XBIGNUM_DATA (res))) |
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303 { |
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304 return (Hashcode) bignum_to_emacs_int (XBIGNUM_DATA (res)); |
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305 } |
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306 |
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307 signal_error (Qrange_error, "Not a valid hash code", res); |
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308 } |
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309 #endif |
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310 |
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311 dead_wrong_type_argument (Qintegerp, res); |
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312 } |
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313 |
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314 static int |
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315 lisp_object_general_equal (const Hash_Table_Test *http, Lisp_Object obj1, |
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316 Lisp_Object obj2) |
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317 { |
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318 struct gcpro gcpro1; |
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319 Lisp_Object args[] = { http->lisp_equal_function, obj1, obj2 }, res; |
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320 |
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321 GCPRO1 (args[0]); |
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322 gcpro1.nvars = countof (args); |
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323 res = IGNORE_MULTIPLE_VALUES (Ffuncall (countof (args), args)); |
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324 UNGCPRO; |
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325 |
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326 return !(NILP (res)); |
| 428 | 327 } |
| 328 | |
| 329 | |
| 330 static Lisp_Object | |
| 331 mark_hash_table (Lisp_Object obj) | |
| 332 { | |
| 333 Lisp_Hash_Table *ht = XHASH_TABLE (obj); | |
| 334 | |
| 335 /* If the hash table is weak, we don't want to mark the keys and | |
| 336 values (we scan over them after everything else has been marked, | |
| 337 and mark or remove them as necessary). */ | |
| 338 if (ht->weakness == HASH_TABLE_NON_WEAK) | |
| 339 { | |
| 1204 | 340 htentry *e, *sentinel; |
| 428 | 341 |
| 342 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 343 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 344 { |
| 345 mark_object (e->key); | |
| 346 mark_object (e->value); | |
| 347 } | |
| 348 } | |
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349 |
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350 mark_object (ht->test); |
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351 |
| 428 | 352 return Qnil; |
| 353 } | |
| 354 | |
| 355 /* Equality of hash tables. Two hash tables are equal when they are of | |
| 356 the same weakness and test function, they have the same number of | |
| 357 elements, and for each key in the hash table, the values are `equal'. | |
| 358 | |
| 359 This is similar to Common Lisp `equalp' of hash tables, with the | |
| 360 difference that CL requires the keys to be compared with the test | |
| 361 function, which we don't do. Doing that would require consing, and | |
| 362 consing is a bad idea in `equal'. Anyway, our method should provide | |
| 363 the same result -- if the keys are not equal according to the test | |
| 364 function, then Fgethash() in hash_table_equal_mapper() will fail. */ | |
| 365 static int | |
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366 hash_table_equal (Lisp_Object hash_table1, Lisp_Object hash_table2, int depth, |
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367 int foldcase) |
| 428 | 368 { |
| 369 Lisp_Hash_Table *ht1 = XHASH_TABLE (hash_table1); | |
| 370 Lisp_Hash_Table *ht2 = XHASH_TABLE (hash_table2); | |
| 1204 | 371 htentry *e, *sentinel; |
| 428 | 372 |
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373 if (!(EQ (ht1->test, ht2->test)) || |
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374 (ht1->weakness != ht2->weakness) || |
| 428 | 375 (ht1->count != ht2->count)) |
| 376 return 0; | |
| 377 | |
| 378 depth++; | |
| 379 | |
| 380 for (e = ht1->hentries, sentinel = e + ht1->size; e < sentinel; e++) | |
| 1204 | 381 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 382 /* Look up the key in the other hash table, and compare the values. */ |
| 383 { | |
| 384 Lisp_Object value_in_other = Fgethash (e->key, hash_table2, Qunbound); | |
| 385 if (UNBOUNDP (value_in_other) || | |
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386 !internal_equal_0 (e->value, value_in_other, depth, foldcase)) |
| 428 | 387 return 0; /* Give up */ |
| 388 } | |
| 389 | |
| 390 return 1; | |
| 391 } | |
| 442 | 392 |
| 393 /* This is not a great hash function, but it _is_ correct and fast. | |
| 394 Examining all entries is too expensive, and examining a random | |
| 395 subset does not yield a correct hash function. */ | |
| 665 | 396 static Hashcode |
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397 hash_table_hash (Lisp_Object hash_table, int UNUSED (depth), |
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398 int UNUSED (equalp)) |
| 442 | 399 { |
| 400 return XHASH_TABLE (hash_table)->count; | |
| 401 } | |
| 402 | |
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403 #ifdef MEMORY_USAGE_STATS |
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404 |
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405 struct hash_table_stats |
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406 { |
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407 struct usage_stats u; |
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408 Bytecount hentries; |
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409 }; |
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410 |
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411 static void |
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412 hash_table_memory_usage (Lisp_Object hashtab, |
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413 struct generic_usage_stats *gustats) |
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414 { |
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415 Lisp_Hash_Table *ht = XHASH_TABLE (hashtab); |
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416 struct hash_table_stats *stats = (struct hash_table_stats *) gustats; |
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417 stats->hentries += |
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418 malloced_storage_size (ht->hentries, |
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419 sizeof (htentry) * (ht->size + 1), |
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420 &stats->u); |
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421 } |
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422 |
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423 #endif /* MEMORY_USAGE_STATS */ |
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424 |
| 428 | 425 |
| 426 /* Printing hash tables. | |
| 427 | |
| 428 This is non-trivial, because we use a readable structure-style | |
| 429 syntax for hash tables. This means that a typical hash table will be | |
| 430 readably printed in the form of: | |
| 431 | |
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432 #s(hash-table :size 2 :data (key1 value1 key2 value2)) |
| 428 | 433 |
| 434 The supported hash table structure keywords and their values are: | |
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435 `:test' (eql (or nil), eq or equal) |
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436 `:size' (a natnum or nil) |
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437 `:rehash-size' (a float) |
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438 `:rehash-threshold' (a float) |
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439 `:weakness' (nil, key, value, key-and-value, or key-or-value) |
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440 `:data' (a list) |
| 428 | 441 |
| 430 | 442 If `print-readably' is nil, then a simpler syntax is used, for example |
| 428 | 443 |
| 444 #<hash-table size 2/13 data (key1 value1 key2 value2) 0x874d> | |
| 445 | |
| 446 The data is truncated to four pairs, and the rest is shown with | |
| 447 `...'. This printer does not cons. */ | |
| 448 | |
| 449 | |
| 450 /* Print the data of the hash table. This maps through a Lisp | |
| 451 hash table and prints key/value pairs using PRINTCHARFUN. */ | |
| 452 static void | |
| 453 print_hash_table_data (Lisp_Hash_Table *ht, Lisp_Object printcharfun) | |
| 454 { | |
| 455 int count = 0; | |
| 1204 | 456 htentry *e, *sentinel; |
| 428 | 457 |
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458 write_ascstring (printcharfun, " :data ("); |
| 428 | 459 |
| 460 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 461 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 462 { |
| 463 if (count > 0) | |
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464 write_ascstring (printcharfun, " "); |
| 428 | 465 if (!print_readably && count > 3) |
| 466 { | |
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467 write_ascstring (printcharfun, "..."); |
| 428 | 468 break; |
| 469 } | |
| 470 print_internal (e->key, printcharfun, 1); | |
| 800 | 471 write_fmt_string_lisp (printcharfun, " %S", 1, e->value); |
| 428 | 472 count++; |
| 473 } | |
| 474 | |
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475 write_ascstring (printcharfun, ")"); |
| 428 | 476 } |
| 477 | |
| 478 static void | |
| 2286 | 479 print_hash_table (Lisp_Object obj, Lisp_Object printcharfun, |
| 480 int UNUSED (escapeflag)) | |
| 428 | 481 { |
| 482 Lisp_Hash_Table *ht = XHASH_TABLE (obj); | |
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483 Ascbyte pigbuf[350]; |
| 428 | 484 |
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485 write_ascstring (printcharfun, |
| 826 | 486 print_readably ? "#s(hash-table" : "#<hash-table"); |
| 428 | 487 |
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488 if (!(EQ (ht->test, Vhash_table_test_eql))) |
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489 { |
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490 write_fmt_string_lisp (printcharfun, " :test %S", |
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491 1, XHASH_TABLE_TEST (ht->test)->name); |
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492 } |
| 428 | 493 |
| 494 if (ht->count || !print_readably) | |
| 495 { | |
| 496 if (print_readably) | |
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497 write_fmt_string (printcharfun, " :size %ld", (long) ht->count); |
| 428 | 498 else |
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499 write_fmt_string (printcharfun, " :size %ld/%ld", (long) ht->count, |
| 800 | 500 (long) ht->size); |
| 428 | 501 } |
| 502 | |
| 503 if (ht->weakness != HASH_TABLE_NON_WEAK) | |
| 504 { | |
| 800 | 505 write_fmt_string |
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506 (printcharfun, " :weakness %s", |
| 800 | 507 (ht->weakness == HASH_TABLE_WEAK ? "key-and-value" : |
| 508 ht->weakness == HASH_TABLE_KEY_WEAK ? "key" : | |
| 509 ht->weakness == HASH_TABLE_VALUE_WEAK ? "value" : | |
| 510 ht->weakness == HASH_TABLE_KEY_VALUE_WEAK ? "key-or-value" : | |
| 511 "you-d-better-not-see-this")); | |
| 428 | 512 } |
| 513 | |
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514 if (ht->rehash_size != HASH_TABLE_DEFAULT_REHASH_SIZE) |
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515 { |
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516 float_to_string (pigbuf, ht->rehash_size); |
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517 write_fmt_string (printcharfun, " :rehash-size %s", pigbuf); |
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518 } |
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519 |
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520 if (ht->rehash_threshold |
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521 != HASH_TABLE_DEFAULT_REHASH_THRESHOLD (ht->size, ht->test)) |
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522 { |
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523 float_to_string (pigbuf, ht->rehash_threshold); |
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524 write_fmt_string (printcharfun, " :rehash-threshold %s", pigbuf); |
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525 } |
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526 |
| 428 | 527 if (ht->count) |
| 528 print_hash_table_data (ht, printcharfun); | |
| 529 | |
| 530 if (print_readably) | |
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531 write_ascstring (printcharfun, ")"); |
| 428 | 532 else |
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533 write_fmt_string (printcharfun, " 0x%x>", LISP_OBJECT_UID (obj)); |
| 428 | 534 } |
| 535 | |
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536 #ifdef ERROR_CHECK_STRUCTURES |
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537 #define USED_IF_ERROR_CHECK_STRUCTURES(x) x |
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538 #else |
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539 #define USED_IF_ERROR_CHECK_STRUCTURES(x) UNUSED (x) |
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540 #endif |
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541 |
| 4117 | 542 #ifndef NEW_GC |
| 428 | 543 static void |
| 4117 | 544 free_hentries (htentry *hentries, |
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545 Elemcount USED_IF_ERROR_CHECK_STRUCTURES (size)) |
| 489 | 546 { |
| 800 | 547 #ifdef ERROR_CHECK_STRUCTURES |
| 489 | 548 /* Ensure a crash if other code uses the discarded entries afterwards. */ |
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549 deadbeef_memory (hentries, |
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550 (Rawbyte *) (hentries + size) - (Rawbyte *) hentries); |
| 489 | 551 #endif |
| 552 | |
| 553 if (!DUMPEDP (hentries)) | |
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554 xfree (hentries); |
| 489 | 555 } |
| 556 | |
| 557 static void | |
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558 finalize_hash_table (Lisp_Object obj) |
| 428 | 559 { |
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560 Lisp_Hash_Table *ht = XHASH_TABLE (obj); |
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561 free_hentries (ht->hentries, ht->size); |
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562 ht->hentries = 0; |
| 428 | 563 } |
| 3263 | 564 #endif /* not NEW_GC */ |
| 428 | 565 |
| 1204 | 566 static const struct memory_description htentry_description_1[] = { |
| 567 { XD_LISP_OBJECT, offsetof (htentry, key) }, | |
| 568 { XD_LISP_OBJECT, offsetof (htentry, value) }, | |
| 428 | 569 { XD_END } |
| 570 }; | |
| 571 | |
| 1204 | 572 static const struct sized_memory_description htentry_description = { |
| 573 sizeof (htentry), | |
| 574 htentry_description_1 | |
| 428 | 575 }; |
| 576 | |
| 3092 | 577 #ifdef NEW_GC |
| 578 static const struct memory_description htentry_weak_description_1[] = { | |
| 579 { XD_LISP_OBJECT, offsetof (htentry, key), 0, { 0 }, XD_FLAG_NO_KKCC}, | |
| 580 { XD_LISP_OBJECT, offsetof (htentry, value), 0, { 0 }, XD_FLAG_NO_KKCC}, | |
| 581 { XD_END } | |
| 582 }; | |
| 583 | |
| 584 static const struct sized_memory_description htentry_weak_description = { | |
| 585 sizeof (htentry), | |
| 586 htentry_weak_description_1 | |
| 587 }; | |
| 588 | |
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589 DEFINE_DUMPABLE_INTERNAL_LISP_OBJECT ("hash-table-entry", hash_table_entry, |
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590 0, htentry_description_1, |
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591 Lisp_Hash_Table_Entry); |
| 3092 | 592 #endif /* NEW_GC */ |
| 593 | |
| 1204 | 594 static const struct memory_description htentry_union_description_1[] = { |
| 595 /* Note: XD_INDIRECT in this table refers to the surrounding table, | |
| 596 and so this will work. */ | |
| 3092 | 597 #ifdef NEW_GC |
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598 { XD_INLINE_LISP_OBJECT_BLOCK_PTR, HASH_TABLE_NON_WEAK, |
| 3092 | 599 XD_INDIRECT (0, 1), { &htentry_description } }, |
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600 { XD_INLINE_LISP_OBJECT_BLOCK_PTR, 0, XD_INDIRECT (0, 1), |
| 3092 | 601 { &htentry_weak_description }, XD_FLAG_UNION_DEFAULT_ENTRY }, |
| 602 #else /* not NEW_GC */ | |
| 2367 | 603 { XD_BLOCK_PTR, HASH_TABLE_NON_WEAK, XD_INDIRECT (0, 1), |
| 2551 | 604 { &htentry_description } }, |
| 605 { XD_BLOCK_PTR, 0, XD_INDIRECT (0, 1), { &htentry_description }, | |
| 1204 | 606 XD_FLAG_UNION_DEFAULT_ENTRY | XD_FLAG_NO_KKCC }, |
| 3092 | 607 #endif /* not NEW_GC */ |
| 1204 | 608 { XD_END } |
| 609 }; | |
| 610 | |
| 611 static const struct sized_memory_description htentry_union_description = { | |
| 612 sizeof (htentry *), | |
| 613 htentry_union_description_1 | |
| 614 }; | |
| 615 | |
| 616 const struct memory_description hash_table_description[] = { | |
| 617 { XD_ELEMCOUNT, offsetof (Lisp_Hash_Table, size) }, | |
| 618 { XD_INT, offsetof (Lisp_Hash_Table, weakness) }, | |
| 619 { XD_UNION, offsetof (Lisp_Hash_Table, hentries), XD_INDIRECT (1, 0), | |
| 2551 | 620 { &htentry_union_description } }, |
| 440 | 621 { XD_LO_LINK, offsetof (Lisp_Hash_Table, next_weak) }, |
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622 { XD_LISP_OBJECT,offsetof (Lisp_Hash_Table, test) }, |
| 428 | 623 { XD_END } |
| 624 }; | |
| 625 | |
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626 DEFINE_DUMPABLE_LISP_OBJECT ("hash-table", hash_table, |
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627 mark_hash_table, print_hash_table, |
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628 IF_OLD_GC (finalize_hash_table), |
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629 hash_table_equal, hash_table_hash, |
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630 hash_table_description, |
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631 Lisp_Hash_Table); |
| 428 | 632 |
| 633 static Lisp_Hash_Table * | |
| 634 xhash_table (Lisp_Object hash_table) | |
| 635 { | |
| 1123 | 636 /* #### What's going on here? Why the gc_in_progress check? */ |
| 428 | 637 if (!gc_in_progress) |
| 638 CHECK_HASH_TABLE (hash_table); | |
| 639 check_hash_table_invariants (XHASH_TABLE (hash_table)); | |
| 640 return XHASH_TABLE (hash_table); | |
| 641 } | |
| 642 | |
| 643 | |
| 644 /************************************************************************/ | |
| 645 /* Creation of Hash Tables */ | |
| 646 /************************************************************************/ | |
| 647 | |
| 648 /* Creation of hash tables, without error-checking. */ | |
| 649 static void | |
| 650 compute_hash_table_derived_values (Lisp_Hash_Table *ht) | |
| 651 { | |
| 665 | 652 ht->rehash_count = (Elemcount) |
| 438 | 653 ((double) ht->size * ht->rehash_threshold); |
| 665 | 654 ht->golden_ratio = (Elemcount) |
| 428 | 655 ((double) ht->size * (.6180339887 / (double) sizeof (Lisp_Object))); |
| 656 } | |
| 657 | |
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658 static htentry * |
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659 allocate_hash_table_entries (Elemcount size) |
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660 { |
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661 #ifdef NEW_GC |
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662 return XHASH_TABLE_ENTRY (alloc_lrecord_array |
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663 (size, &lrecord_hash_table_entry)); |
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664 #else /* not NEW_GC */ |
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665 return xnew_array_and_zero (htentry, size); |
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666 #endif /* not NEW_GC */ |
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667 } |
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668 |
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669 static Lisp_Object decode_hash_table_test (Lisp_Object obj); |
| 450 | 670 |
| 671 Lisp_Object | |
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672 make_general_lisp_hash_table (Lisp_Object test, |
| 665 | 673 Elemcount size, |
| 428 | 674 double rehash_size, |
| 675 double rehash_threshold, | |
| 676 enum hash_table_weakness weakness) | |
| 677 { | |
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678 Lisp_Object hash_table = ALLOC_NORMAL_LISP_OBJECT (hash_table); |
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679 Lisp_Hash_Table *ht = XHASH_TABLE (hash_table); |
| 428 | 680 |
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681 assert (HASH_TABLE_TESTP (test)); |
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682 |
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683 ht->test = test; |
| 438 | 684 ht->weakness = weakness; |
| 685 | |
| 686 ht->rehash_size = | |
| 687 rehash_size > 1.0 ? rehash_size : HASH_TABLE_DEFAULT_REHASH_SIZE; | |
| 688 | |
| 689 ht->rehash_threshold = | |
| 690 rehash_threshold > 0.0 ? rehash_threshold : | |
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691 HASH_TABLE_DEFAULT_REHASH_THRESHOLD (size, ht->test); |
| 438 | 692 |
| 428 | 693 if (size < HASH_TABLE_MIN_SIZE) |
| 694 size = HASH_TABLE_MIN_SIZE; | |
| 665 | 695 ht->size = hash_table_size ((Elemcount) (((double) size / ht->rehash_threshold) |
| 438 | 696 + 1.0)); |
| 428 | 697 ht->count = 0; |
| 438 | 698 |
| 428 | 699 compute_hash_table_derived_values (ht); |
| 700 | |
| 1204 | 701 /* We leave room for one never-occupied sentinel htentry at the end. */ |
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702 ht->hentries = allocate_hash_table_entries (ht->size + 1); |
| 428 | 703 |
| 704 if (weakness == HASH_TABLE_NON_WEAK) | |
| 705 ht->next_weak = Qunbound; | |
| 706 else | |
| 707 ht->next_weak = Vall_weak_hash_tables, Vall_weak_hash_tables = hash_table; | |
| 708 | |
| 709 return hash_table; | |
| 710 } | |
| 711 | |
| 712 Lisp_Object | |
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713 make_lisp_hash_table (Elemcount size, enum hash_table_weakness weakness, |
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714 Lisp_Object test) |
| 428 | 715 { |
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716 test = decode_hash_table_test (test); |
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717 return make_general_lisp_hash_table (test, size, -1.0, -1.0, weakness); |
| 428 | 718 } |
| 719 | |
| 720 /* Pretty reading of hash tables. | |
| 721 | |
| 722 Here we use the existing structures mechanism (which is, | |
| 723 unfortunately, pretty cumbersome) for validating and instantiating | |
| 724 the hash tables. The idea is that the side-effect of reading a | |
| 725 #s(hash-table PLIST) object is creation of a hash table with desired | |
| 726 properties, and that the hash table is returned. */ | |
| 727 | |
| 728 /* Validation functions: each keyword provides its own validation | |
| 729 function. The errors should maybe be continuable, but it is | |
| 730 unclear how this would cope with ERRB. */ | |
| 731 static int | |
| 2286 | 732 hash_table_size_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 733 Error_Behavior errb) | |
| 428 | 734 { |
| 735 if (NATNUMP (value)) | |
| 736 return 1; | |
| 737 | |
| 563 | 738 maybe_signal_error_1 (Qwrong_type_argument, list2 (Qnatnump, value), |
| 2286 | 739 Qhash_table, errb); |
| 428 | 740 return 0; |
| 741 } | |
| 742 | |
| 665 | 743 static Elemcount |
| 428 | 744 decode_hash_table_size (Lisp_Object obj) |
| 745 { | |
| 746 return NILP (obj) ? HASH_TABLE_DEFAULT_SIZE : XINT (obj); | |
| 747 } | |
| 748 | |
| 749 static int | |
| 2286 | 750 hash_table_weakness_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 578 | 751 Error_Behavior errb) |
| 428 | 752 { |
| 442 | 753 if (EQ (value, Qnil)) return 1; |
| 754 if (EQ (value, Qt)) return 1; | |
| 755 if (EQ (value, Qkey)) return 1; | |
| 756 if (EQ (value, Qkey_and_value)) return 1; | |
| 757 if (EQ (value, Qkey_or_value)) return 1; | |
| 758 if (EQ (value, Qvalue)) return 1; | |
| 428 | 759 |
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760 #ifdef NEED_TO_HANDLE_21_4_CODE |
| 428 | 761 /* Following values are obsolete as of 19990901 in xemacs-21.2 */ |
| 442 | 762 if (EQ (value, Qnon_weak)) return 1; |
| 763 if (EQ (value, Qweak)) return 1; | |
| 764 if (EQ (value, Qkey_weak)) return 1; | |
| 765 if (EQ (value, Qkey_or_value_weak)) return 1; | |
| 766 if (EQ (value, Qvalue_weak)) return 1; | |
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767 #endif |
| 428 | 768 |
| 563 | 769 maybe_invalid_constant ("Invalid hash table weakness", |
| 428 | 770 value, Qhash_table, errb); |
| 771 return 0; | |
| 772 } | |
| 773 | |
| 774 static enum hash_table_weakness | |
| 775 decode_hash_table_weakness (Lisp_Object obj) | |
| 776 { | |
| 442 | 777 if (EQ (obj, Qnil)) return HASH_TABLE_NON_WEAK; |
| 778 if (EQ (obj, Qt)) return HASH_TABLE_WEAK; | |
| 779 if (EQ (obj, Qkey_and_value)) return HASH_TABLE_WEAK; | |
| 780 if (EQ (obj, Qkey)) return HASH_TABLE_KEY_WEAK; | |
| 781 if (EQ (obj, Qkey_or_value)) return HASH_TABLE_KEY_VALUE_WEAK; | |
| 782 if (EQ (obj, Qvalue)) return HASH_TABLE_VALUE_WEAK; | |
| 428 | 783 |
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784 #ifdef NEED_TO_HANDLE_21_4_CODE |
| 428 | 785 /* Following values are obsolete as of 19990901 in xemacs-21.2 */ |
| 442 | 786 if (EQ (obj, Qnon_weak)) return HASH_TABLE_NON_WEAK; |
| 787 if (EQ (obj, Qweak)) return HASH_TABLE_WEAK; | |
| 788 if (EQ (obj, Qkey_weak)) return HASH_TABLE_KEY_WEAK; | |
| 789 if (EQ (obj, Qkey_or_value_weak)) return HASH_TABLE_KEY_VALUE_WEAK; | |
| 790 if (EQ (obj, Qvalue_weak)) return HASH_TABLE_VALUE_WEAK; | |
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791 #endif |
| 428 | 792 |
| 563 | 793 invalid_constant ("Invalid hash table weakness", obj); |
| 1204 | 794 RETURN_NOT_REACHED (HASH_TABLE_NON_WEAK); |
| 428 | 795 } |
| 796 | |
| 797 static int | |
| 2286 | 798 hash_table_test_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 799 Error_Behavior errb) | |
| 428 | 800 { |
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801 Lisp_Object lookup; |
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802 |
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803 if (NILP (value)) |
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804 { |
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805 return 1; |
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806 } |
| 428 | 807 |
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808 lookup = Fassq (value, XWEAK_LIST_LIST (Vhash_table_test_weak_list)); |
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809 if (NILP (lookup)) |
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810 { |
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811 maybe_invalid_constant ("Invalid hash table test", |
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812 value, Qhash_table, errb); |
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813 } |
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814 |
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815 return 1; |
| 428 | 816 } |
| 817 | |
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818 static Lisp_Object |
| 428 | 819 decode_hash_table_test (Lisp_Object obj) |
| 820 { | |
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821 Lisp_Object result; |
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822 |
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823 if (NILP (obj)) |
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824 { |
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825 obj = Qeql; |
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826 } |
| 428 | 827 |
|
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828 result = Fassq (obj, XWEAK_LIST_LIST (Vhash_table_test_weak_list)); |
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829 if (NILP (result)) |
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830 { |
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831 invalid_constant ("Invalid hash table test", obj); |
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832 } |
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833 |
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834 return XCDR (result); |
| 428 | 835 } |
| 836 | |
| 837 static int | |
| 2286 | 838 hash_table_rehash_size_validate (Lisp_Object UNUSED (keyword), |
| 839 Lisp_Object value, Error_Behavior errb) | |
| 428 | 840 { |
| 841 if (!FLOATP (value)) | |
| 842 { | |
| 563 | 843 maybe_signal_error_1 (Qwrong_type_argument, list2 (Qfloatp, value), |
| 428 | 844 Qhash_table, errb); |
| 845 return 0; | |
| 846 } | |
| 847 | |
| 848 { | |
| 849 double rehash_size = XFLOAT_DATA (value); | |
| 850 if (rehash_size <= 1.0) | |
| 851 { | |
| 563 | 852 maybe_invalid_argument |
| 428 | 853 ("Hash table rehash size must be greater than 1.0", |
| 854 value, Qhash_table, errb); | |
| 855 return 0; | |
| 856 } | |
| 857 } | |
| 858 | |
| 859 return 1; | |
| 860 } | |
| 861 | |
| 862 static double | |
| 863 decode_hash_table_rehash_size (Lisp_Object rehash_size) | |
| 864 { | |
|
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865 /* -1.0 signals make_general_lisp_hash_table to use the default. */ |
| 428 | 866 return NILP (rehash_size) ? -1.0 : XFLOAT_DATA (rehash_size); |
| 867 } | |
| 868 | |
| 869 static int | |
| 2286 | 870 hash_table_rehash_threshold_validate (Lisp_Object UNUSED (keyword), |
| 871 Lisp_Object value, Error_Behavior errb) | |
| 428 | 872 { |
| 873 if (!FLOATP (value)) | |
| 874 { | |
| 563 | 875 maybe_signal_error_1 (Qwrong_type_argument, list2 (Qfloatp, value), |
| 428 | 876 Qhash_table, errb); |
| 877 return 0; | |
| 878 } | |
| 879 | |
| 880 { | |
| 881 double rehash_threshold = XFLOAT_DATA (value); | |
| 882 if (rehash_threshold <= 0.0 || rehash_threshold >= 1.0) | |
| 883 { | |
| 563 | 884 maybe_invalid_argument |
| 428 | 885 ("Hash table rehash threshold must be between 0.0 and 1.0", |
| 886 value, Qhash_table, errb); | |
| 887 return 0; | |
| 888 } | |
| 889 } | |
| 890 | |
| 891 return 1; | |
| 892 } | |
| 893 | |
| 894 static double | |
| 895 decode_hash_table_rehash_threshold (Lisp_Object rehash_threshold) | |
| 896 { | |
|
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897 /* -1.0 signals make_general_lisp_hash_table to use the default. */ |
| 428 | 898 return NILP (rehash_threshold) ? -1.0 : XFLOAT_DATA (rehash_threshold); |
| 899 } | |
| 900 | |
| 901 static int | |
| 2286 | 902 hash_table_data_validate (Lisp_Object UNUSED (keyword), Lisp_Object value, |
| 903 Error_Behavior errb) | |
| 428 | 904 { |
| 905 int len; | |
| 906 | |
|
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907 /* Check for improper lists while getting length. */ |
| 428 | 908 GET_EXTERNAL_LIST_LENGTH (value, len); |
| 909 | |
| 910 if (len & 1) | |
| 911 { | |
| 563 | 912 maybe_sferror |
| 428 | 913 ("Hash table data must have alternating key/value pairs", |
| 914 value, Qhash_table, errb); | |
| 915 return 0; | |
| 916 } | |
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917 |
| 428 | 918 return 1; |
| 919 } | |
| 920 | |
| 921 /* The actual instantiation of a hash table. This does practically no | |
| 922 error checking, because it relies on the fact that the paranoid | |
| 923 functions above have error-checked everything to the last details. | |
| 924 If this assumption is wrong, we will get a crash immediately (with | |
| 925 error-checking compiled in), and we'll know if there is a bug in | |
| 926 the structure mechanism. So there. */ | |
| 927 static Lisp_Object | |
| 928 hash_table_instantiate (Lisp_Object plist) | |
| 929 { | |
| 930 Lisp_Object hash_table; | |
| 931 Lisp_Object test = Qnil; | |
| 932 Lisp_Object size = Qnil; | |
| 933 Lisp_Object rehash_size = Qnil; | |
| 934 Lisp_Object rehash_threshold = Qnil; | |
| 935 Lisp_Object weakness = Qnil; | |
| 936 Lisp_Object data = Qnil; | |
| 937 | |
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938 if (KEYWORDP (Fcar (plist))) |
| 428 | 939 { |
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940 PROPERTY_LIST_LOOP_3 (key, value, plist) |
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941 { |
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942 if (EQ (key, Q_test)) test = value; |
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943 else if (EQ (key, Q_size)) size = value; |
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944 else if (EQ (key, Q_rehash_size)) rehash_size = value; |
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945 else if (EQ (key, Q_rehash_threshold)) rehash_threshold = value; |
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946 else if (EQ (key, Q_weakness)) weakness = value; |
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947 else if (EQ (key, Q_data)) data = value; |
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948 else if (!KEYWORDP (key)) |
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949 signal_error (Qinvalid_read_syntax, |
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950 "can't mix keyword and non-keyword hash table syntax", |
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951 key); |
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952 else ABORT(); |
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953 } |
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954 } |
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955 else |
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956 { |
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957 PROPERTY_LIST_LOOP_3 (key, value, plist) |
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958 { |
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959 if (EQ (key, Qtest)) test = value; |
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960 else if (EQ (key, Qsize)) size = value; |
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961 else if (EQ (key, Qrehash_size)) rehash_size = value; |
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962 else if (EQ (key, Qrehash_threshold)) rehash_threshold = value; |
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963 else if (EQ (key, Qweakness)) weakness = value; |
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964 else if (EQ (key, Qdata)) data = value; |
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965 #ifndef NO_NEED_TO_HANDLE_21_4_CODE |
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966 else if (EQ (key, Qtype))/*obsolete*/ weakness = value; |
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967 #endif |
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968 else if (KEYWORDP (key)) |
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969 signal_error (Qinvalid_read_syntax, |
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970 "can't mix keyword and non-keyword hash table syntax", |
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971 key); |
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972 else ABORT(); |
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973 } |
| 428 | 974 } |
| 975 | |
| 976 /* Create the hash table. */ | |
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977 hash_table = make_general_lisp_hash_table |
| 428 | 978 (decode_hash_table_test (test), |
| 979 decode_hash_table_size (size), | |
| 980 decode_hash_table_rehash_size (rehash_size), | |
| 981 decode_hash_table_rehash_threshold (rehash_threshold), | |
| 982 decode_hash_table_weakness (weakness)); | |
| 983 | |
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984 /* This can GC with a user-specified test. */ |
| 428 | 985 { |
| 986 struct gcpro gcpro1; | |
| 987 GCPRO1 (hash_table); | |
| 988 | |
| 989 /* And fill it with data. */ | |
| 990 while (!NILP (data)) | |
| 991 { | |
| 992 Lisp_Object key, value; | |
| 993 key = XCAR (data); data = XCDR (data); | |
| 994 value = XCAR (data); data = XCDR (data); | |
| 995 Fputhash (key, value, hash_table); | |
| 996 } | |
| 997 UNGCPRO; | |
| 998 } | |
| 999 | |
| 1000 return hash_table; | |
| 1001 } | |
| 1002 | |
| 1003 static void | |
| 1004 structure_type_create_hash_table_structure_name (Lisp_Object structure_name) | |
| 1005 { | |
| 1006 struct structure_type *st; | |
| 1007 | |
| 1008 st = define_structure_type (structure_name, 0, hash_table_instantiate); | |
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1009 |
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1010 /* First the keyword syntax: */ |
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1011 define_structure_type_keyword (st, Q_test, hash_table_test_validate); |
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1012 define_structure_type_keyword (st, Q_size, hash_table_size_validate); |
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1013 define_structure_type_keyword (st, Q_rehash_size, hash_table_rehash_size_validate); |
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1014 define_structure_type_keyword (st, Q_rehash_threshold, hash_table_rehash_threshold_validate); |
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1015 define_structure_type_keyword (st, Q_weakness, hash_table_weakness_validate); |
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1016 define_structure_type_keyword (st, Q_data, hash_table_data_validate); |
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1017 |
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1018 #ifdef NEED_TO_HANDLE_21_4_CODE |
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1019 /* Next the mutually exclusive, older, non-keyword syntax: */ |
| 428 | 1020 define_structure_type_keyword (st, Qtest, hash_table_test_validate); |
| 1021 define_structure_type_keyword (st, Qsize, hash_table_size_validate); | |
| 1022 define_structure_type_keyword (st, Qrehash_size, hash_table_rehash_size_validate); | |
| 1023 define_structure_type_keyword (st, Qrehash_threshold, hash_table_rehash_threshold_validate); | |
| 1024 define_structure_type_keyword (st, Qweakness, hash_table_weakness_validate); | |
| 1025 define_structure_type_keyword (st, Qdata, hash_table_data_validate); | |
| 1026 | |
| 1027 /* obsolete as of 19990901 in xemacs-21.2 */ | |
| 1028 define_structure_type_keyword (st, Qtype, hash_table_weakness_validate); | |
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1029 #endif |
| 428 | 1030 } |
| 1031 | |
| 1032 /* Create a built-in Lisp structure type named `hash-table'. | |
| 1033 We make #s(hashtable ...) equivalent to #s(hash-table ...), | |
| 1034 for backward compatibility. | |
| 1035 This is called from emacs.c. */ | |
| 1036 void | |
| 1037 structure_type_create_hash_table (void) | |
| 1038 { | |
| 1039 structure_type_create_hash_table_structure_name (Qhash_table); | |
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1040 #ifdef NEED_TO_HANDLE_21_4_CODE |
| 428 | 1041 structure_type_create_hash_table_structure_name (Qhashtable); /* compat */ |
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1042 #endif |
| 428 | 1043 } |
| 1044 | |
| 1045 | |
| 1046 /************************************************************************/ | |
| 1047 /* Definition of Lisp-visible methods */ | |
| 1048 /************************************************************************/ | |
| 1049 | |
| 1050 DEFUN ("hash-table-p", Fhash_table_p, 1, 1, 0, /* | |
| 1051 Return t if OBJECT is a hash table, else nil. | |
| 1052 */ | |
| 1053 (object)) | |
| 1054 { | |
| 1055 return HASH_TABLEP (object) ? Qt : Qnil; | |
| 1056 } | |
| 1057 | |
| 1058 DEFUN ("make-hash-table", Fmake_hash_table, 0, MANY, 0, /* | |
| 1059 Return a new empty hash table object. | |
| 1060 Use Common Lisp style keywords to specify hash table properties. | |
| 1061 | |
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1062 Keyword :test can be `eq', `eql' (default), `equal' or `equalp'. |
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1063 Comparison between keys is done using this function. If speed is important, |
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1064 consider using `eq'. When storing strings in the hash table, you will |
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1065 likely need to use `equal' or `equalp' (for case-insensitivity). With other |
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1066 objects, consider using a test function defined with |
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1067 `define-hash-table-test', an emacs extension to this Common Lisp hash table |
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1068 API. |
| 428 | 1069 |
| 1070 Keyword :size specifies the number of keys likely to be inserted. | |
| 1071 This number of entries can be inserted without enlarging the hash table. | |
| 1072 | |
| 1073 Keyword :rehash-size must be a float greater than 1.0, and specifies | |
| 1074 the factor by which to increase the size of the hash table when enlarging. | |
| 1075 | |
| 1076 Keyword :rehash-threshold must be a float between 0.0 and 1.0, | |
| 1077 and specifies the load factor of the hash table which triggers enlarging. | |
| 1078 | |
| 442 | 1079 Non-standard keyword :weakness can be `nil' (default), `t', `key-and-value', |
| 1080 `key', `value' or `key-or-value'. `t' is an alias for `key-and-value'. | |
| 428 | 1081 |
| 442 | 1082 A key-and-value-weak hash table, also known as a fully-weak or simply |
| 1083 as a weak hash table, is one whose pointers do not count as GC | |
| 1084 referents: for any key-value pair in the hash table, if the only | |
| 1085 remaining pointer to either the key or the value is in a weak hash | |
| 1086 table, then the pair will be removed from the hash table, and the key | |
| 1087 and value collected. A non-weak hash table (or any other pointer) | |
| 1088 would prevent the object from being collected. | |
| 428 | 1089 |
| 1090 A key-weak hash table is similar to a fully-weak hash table except that | |
| 1091 a key-value pair will be removed only if the key remains unmarked | |
| 1092 outside of weak hash tables. The pair will remain in the hash table if | |
| 1093 the key is pointed to by something other than a weak hash table, even | |
| 1094 if the value is not. | |
| 1095 | |
| 1096 A value-weak hash table is similar to a fully-weak hash table except | |
| 1097 that a key-value pair will be removed only if the value remains | |
| 1098 unmarked outside of weak hash tables. The pair will remain in the | |
| 1099 hash table if the value is pointed to by something other than a weak | |
| 1100 hash table, even if the key is not. | |
| 442 | 1101 |
| 1102 A key-or-value-weak hash table is similar to a fully-weak hash table except | |
| 1103 that a key-value pair will be removed only if the value and the key remain | |
| 1104 unmarked outside of weak hash tables. The pair will remain in the | |
| 1105 hash table if the value or key are pointed to by something other than a weak | |
| 1106 hash table, even if the other is not. | |
|
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1107 |
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1108 arguments: (&key TEST SIZE REHASH-SIZE REHASH-THRESHOLD WEAKNESS) |
| 428 | 1109 */ |
| 1110 (int nargs, Lisp_Object *args)) | |
| 1111 { | |
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1112 #ifdef NO_NEED_TO_HANDLE_21_4_CODE |
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1113 PARSE_KEYWORDS (Qmake_hash_table, nargs, args, 0, 5, |
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1114 (test, size, rehash_size, rehash_threshold, weakness), |
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1115 NULL, 0); |
|
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1116 #else |
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1117 PARSE_KEYWORDS (Qmake_hash_table, nargs, args, 0, 6, |
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1118 (test, size, rehash_size, rehash_threshold, weakness, |
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1119 type), (type = Qunbound, weakness = Qunbound), 0); |
| 428 | 1120 |
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1121 if (EQ (weakness, Qunbound)) |
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1122 { |
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1123 if (EQ (weakness, Qunbound) && !EQ (type, Qunbound)) |
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1124 { |
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1125 weakness = type; |
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1126 } |
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1127 else |
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1128 { |
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1129 weakness = Qnil; |
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1130 } |
| 428 | 1131 } |
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1132 #endif |
| 428 | 1133 |
| 1134 #define VALIDATE_VAR(var) \ | |
| 1135 if (!NILP (var)) hash_table_##var##_validate (Q##var, var, ERROR_ME); | |
| 1136 | |
| 1137 VALIDATE_VAR (test); | |
| 1138 VALIDATE_VAR (size); | |
| 1139 VALIDATE_VAR (rehash_size); | |
| 1140 VALIDATE_VAR (rehash_threshold); | |
| 1141 VALIDATE_VAR (weakness); | |
| 1142 | |
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1143 return make_general_lisp_hash_table |
| 428 | 1144 (decode_hash_table_test (test), |
| 1145 decode_hash_table_size (size), | |
| 1146 decode_hash_table_rehash_size (rehash_size), | |
| 1147 decode_hash_table_rehash_threshold (rehash_threshold), | |
| 1148 decode_hash_table_weakness (weakness)); | |
| 1149 } | |
| 1150 | |
| 1151 DEFUN ("copy-hash-table", Fcopy_hash_table, 1, 1, 0, /* | |
| 1152 Return a new hash table containing the same keys and values as HASH-TABLE. | |
| 1153 The keys and values will not themselves be copied. | |
| 1154 */ | |
| 1155 (hash_table)) | |
| 1156 { | |
| 442 | 1157 const Lisp_Hash_Table *ht_old = xhash_table (hash_table); |
|
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1158 Lisp_Object obj = ALLOC_NORMAL_LISP_OBJECT (hash_table); |
|
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1159 Lisp_Hash_Table *ht = XHASH_TABLE (obj); |
|
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1160 copy_lisp_object (obj, hash_table); |
| 428 | 1161 |
|
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1162 /* We leave room for one never-occupied sentinel htentry at the end. */ |
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1163 ht->hentries = allocate_hash_table_entries (ht_old->size + 1); |
| 1204 | 1164 memcpy (ht->hentries, ht_old->hentries, (ht_old->size + 1) * sizeof (htentry)); |
| 428 | 1165 |
| 1166 if (! EQ (ht->next_weak, Qunbound)) | |
| 1167 { | |
| 1168 ht->next_weak = Vall_weak_hash_tables; | |
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1169 Vall_weak_hash_tables = obj; |
| 428 | 1170 } |
| 1171 | |
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1172 return obj; |
| 428 | 1173 } |
| 1174 | |
| 1175 static void | |
| 665 | 1176 resize_hash_table (Lisp_Hash_Table *ht, Elemcount new_size) |
| 428 | 1177 { |
| 1204 | 1178 htentry *old_entries, *new_entries, *sentinel, *e; |
| 665 | 1179 Elemcount old_size; |
|
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1180 Hash_Table_Test *http = XHASH_TABLE_TEST (ht->test); |
| 428 | 1181 |
| 1182 old_size = ht->size; | |
| 1183 ht->size = new_size; | |
| 1184 | |
| 1185 old_entries = ht->hentries; | |
| 1186 | |
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1187 /* We leave room for one never-occupied sentinel htentry at the end. */ |
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1188 ht->hentries = allocate_hash_table_entries (new_size + 1); |
| 428 | 1189 new_entries = ht->hentries; |
| 1190 | |
| 1191 compute_hash_table_derived_values (ht); | |
| 1192 | |
| 440 | 1193 for (e = old_entries, sentinel = e + old_size; e < sentinel; e++) |
| 1204 | 1194 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1195 { |
|
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1196 htentry *probe = new_entries + HASHCODE (e->key, ht, http); |
| 428 | 1197 LINEAR_PROBING_LOOP (probe, new_entries, new_size) |
| 1198 ; | |
| 1199 *probe = *e; | |
| 1200 } | |
| 1201 | |
| 4117 | 1202 #ifndef NEW_GC |
| 489 | 1203 free_hentries (old_entries, old_size); |
| 4117 | 1204 #endif /* not NEW_GC */ |
| 428 | 1205 } |
| 1206 | |
| 440 | 1207 /* After a hash table has been saved to disk and later restored by the |
| 1208 portable dumper, it contains the same objects, but their addresses | |
| 665 | 1209 and thus their HASHCODEs have changed. */ |
| 428 | 1210 void |
| 440 | 1211 pdump_reorganize_hash_table (Lisp_Object hash_table) |
| 428 | 1212 { |
| 442 | 1213 const Lisp_Hash_Table *ht = xhash_table (hash_table); |
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1214 /* We leave room for one never-occupied sentinel htentry at the end. */ |
|
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1215 htentry *new_entries = allocate_hash_table_entries (ht->size + 1); |
| 1204 | 1216 htentry *e, *sentinel; |
|
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1217 Hash_Table_Test *http = XHASH_TABLE_TEST (ht->test); |
| 440 | 1218 |
| 1219 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 1220 if (!HTENTRY_CLEAR_P (e)) |
| 440 | 1221 { |
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1222 htentry *probe = new_entries + HASHCODE (e->key, ht, http); |
| 440 | 1223 LINEAR_PROBING_LOOP (probe, new_entries, ht->size) |
| 1224 ; | |
| 1225 *probe = *e; | |
| 1226 } | |
| 1227 | |
| 1204 | 1228 memcpy (ht->hentries, new_entries, ht->size * sizeof (htentry)); |
| 440 | 1229 |
| 4117 | 1230 #ifndef NEW_GC |
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1231 xfree (new_entries); |
| 3092 | 1232 #endif /* not NEW_GC */ |
| 428 | 1233 } |
| 1234 | |
| 1235 static void | |
| 1236 enlarge_hash_table (Lisp_Hash_Table *ht) | |
| 1237 { | |
| 665 | 1238 Elemcount new_size = |
| 1239 hash_table_size ((Elemcount) ((double) ht->size * ht->rehash_size)); | |
| 428 | 1240 resize_hash_table (ht, new_size); |
| 1241 } | |
| 1242 | |
| 4072 | 1243 htentry * |
| 1204 | 1244 find_htentry (Lisp_Object key, const Lisp_Hash_Table *ht) |
| 428 | 1245 { |
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1246 Lisp_Object test = ht->test; |
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1247 Hash_Table_Test *http = XHASH_TABLE_TEST (test); |
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1248 |
| 1204 | 1249 htentry *entries = ht->hentries; |
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1250 htentry *probe = entries + HASHCODE (key, ht, http); |
| 428 | 1251 |
| 1252 LINEAR_PROBING_LOOP (probe, entries, ht->size) | |
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1253 if (KEYS_EQUAL_P (probe->key, key, test, http)) |
| 428 | 1254 break; |
| 1255 | |
| 1256 return probe; | |
| 1257 } | |
| 1258 | |
| 2421 | 1259 /* A version of Fputhash() that increments the value by the specified |
|
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1260 amount and dispenses with all error checks. Assumes that tables does |
| 2421 | 1261 comparison using EQ. Used by the profiling routines to avoid |
| 1262 overhead -- profiling overhead was being recorded at up to 15% of the | |
| 1263 total time. */ | |
| 1264 | |
| 1265 void | |
| 1266 inchash_eq (Lisp_Object key, Lisp_Object table, EMACS_INT offset) | |
| 1267 { | |
| 1268 Lisp_Hash_Table *ht = XHASH_TABLE (table); | |
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1269 Hash_Table_Test *http = XHASH_TABLE_TEST (ht->test); |
| 2421 | 1270 htentry *entries = ht->hentries; |
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1271 htentry *probe = entries + HASHCODE (key, ht, http); |
| 2421 | 1272 |
| 1273 LINEAR_PROBING_LOOP (probe, entries, ht->size) | |
| 1274 if (EQ (probe->key, key)) | |
| 1275 break; | |
| 1276 | |
| 1277 if (!HTENTRY_CLEAR_P (probe)) | |
| 1278 probe->value = make_int (XINT (probe->value) + offset); | |
| 1279 else | |
| 1280 { | |
| 1281 probe->key = key; | |
| 1282 probe->value = make_int (offset); | |
| 1283 | |
| 1284 if (++ht->count >= ht->rehash_count) | |
| 1285 enlarge_hash_table (ht); | |
| 1286 } | |
| 1287 } | |
| 1288 | |
| 428 | 1289 DEFUN ("gethash", Fgethash, 2, 3, 0, /* |
| 1290 Find hash value for KEY in HASH-TABLE. | |
| 1291 If there is no corresponding value, return DEFAULT (which defaults to nil). | |
| 1292 */ | |
| 1293 (key, hash_table, default_)) | |
| 1294 { | |
| 442 | 1295 const Lisp_Hash_Table *ht = xhash_table (hash_table); |
| 1204 | 1296 htentry *e = find_htentry (key, ht); |
| 428 | 1297 |
| 1204 | 1298 return HTENTRY_CLEAR_P (e) ? default_ : e->value; |
| 428 | 1299 } |
| 1300 | |
| 1301 DEFUN ("puthash", Fputhash, 3, 3, 0, /* | |
|
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1302 Hash KEY to VALUE in HASH-TABLE, and return VALUE. |
| 428 | 1303 */ |
| 1304 (key, value, hash_table)) | |
| 1305 { | |
| 1306 Lisp_Hash_Table *ht = xhash_table (hash_table); | |
| 1204 | 1307 htentry *e = find_htentry (key, ht); |
| 428 | 1308 |
| 1204 | 1309 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1310 return e->value = value; |
| 1311 | |
| 1312 e->key = key; | |
| 1313 e->value = value; | |
| 1314 | |
| 1315 if (++ht->count >= ht->rehash_count) | |
| 1316 enlarge_hash_table (ht); | |
| 1317 | |
| 1318 return value; | |
| 1319 } | |
| 1320 | |
| 1204 | 1321 /* Remove htentry pointed at by PROBE. |
| 428 | 1322 Subsequent entries are removed and reinserted. |
| 1323 We don't use tombstones - too wasteful. */ | |
| 1324 static void | |
| 1204 | 1325 remhash_1 (Lisp_Hash_Table *ht, htentry *entries, htentry *probe) |
| 428 | 1326 { |
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1327 Hash_Table_Test *http = XHASH_TABLE_TEST (ht->test); |
| 665 | 1328 Elemcount size = ht->size; |
| 1204 | 1329 CLEAR_HTENTRY (probe); |
| 428 | 1330 probe++; |
| 1331 ht->count--; | |
| 1332 | |
| 1333 LINEAR_PROBING_LOOP (probe, entries, size) | |
| 1334 { | |
| 1335 Lisp_Object key = probe->key; | |
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|
1336 htentry *probe2 = entries + HASHCODE (key, ht, http); |
| 428 | 1337 LINEAR_PROBING_LOOP (probe2, entries, size) |
| 1338 if (EQ (probe2->key, key)) | |
| 1204 | 1339 /* htentry at probe doesn't need to move. */ |
| 428 | 1340 goto continue_outer_loop; |
| 1204 | 1341 /* Move htentry from probe to new home at probe2. */ |
| 428 | 1342 *probe2 = *probe; |
| 1204 | 1343 CLEAR_HTENTRY (probe); |
| 428 | 1344 continue_outer_loop: continue; |
| 1345 } | |
| 1346 } | |
| 1347 | |
| 1348 DEFUN ("remhash", Fremhash, 2, 2, 0, /* | |
| 1349 Remove the entry for KEY from HASH-TABLE. | |
| 1350 Do nothing if there is no entry for KEY in HASH-TABLE. | |
| 617 | 1351 Return non-nil if an entry was removed. |
| 428 | 1352 */ |
| 1353 (key, hash_table)) | |
| 1354 { | |
| 1355 Lisp_Hash_Table *ht = xhash_table (hash_table); | |
| 1204 | 1356 htentry *e = find_htentry (key, ht); |
| 428 | 1357 |
| 1204 | 1358 if (HTENTRY_CLEAR_P (e)) |
| 428 | 1359 return Qnil; |
| 1360 | |
| 1361 remhash_1 (ht, ht->hentries, e); | |
| 1362 return Qt; | |
| 1363 } | |
| 1364 | |
| 1365 DEFUN ("clrhash", Fclrhash, 1, 1, 0, /* | |
| 1366 Remove all entries from HASH-TABLE, leaving it empty. | |
|
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1367 Return HASH-TABLE. |
| 428 | 1368 */ |
| 1369 (hash_table)) | |
| 1370 { | |
| 1371 Lisp_Hash_Table *ht = xhash_table (hash_table); | |
| 1204 | 1372 htentry *e, *sentinel; |
| 428 | 1373 |
| 1374 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 1375 CLEAR_HTENTRY (e); |
| 428 | 1376 ht->count = 0; |
| 1377 | |
| 1378 return hash_table; | |
| 1379 } | |
| 1380 | |
| 1381 /************************************************************************/ | |
| 1382 /* Accessor Functions */ | |
| 1383 /************************************************************************/ | |
| 1384 | |
| 1385 DEFUN ("hash-table-count", Fhash_table_count, 1, 1, 0, /* | |
| 1386 Return the number of entries in HASH-TABLE. | |
| 1387 */ | |
| 1388 (hash_table)) | |
| 1389 { | |
| 1390 return make_int (xhash_table (hash_table)->count); | |
| 1391 } | |
| 1392 | |
| 1393 DEFUN ("hash-table-test", Fhash_table_test, 1, 1, 0, /* | |
|
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1394 Return HASH-TABLE's test. |
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1395 |
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1396 This can be one of `eq', `eql', `equal', `equalp', or some symbol supplied |
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|
1397 as the NAME argument to `define-hash-table-test', which see. |
| 428 | 1398 */ |
| 1399 (hash_table)) | |
| 1400 { | |
|
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1401 CHECK_HASH_TABLE (hash_table); |
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1402 return XHASH_TABLE_TEST (XHASH_TABLE (hash_table)->test)->name; |
| 428 | 1403 } |
| 1404 | |
| 1405 DEFUN ("hash-table-size", Fhash_table_size, 1, 1, 0, /* | |
| 1406 Return the size of HASH-TABLE. | |
| 1407 This is the current number of slots in HASH-TABLE, whether occupied or not. | |
| 1408 */ | |
| 1409 (hash_table)) | |
| 1410 { | |
| 1411 return make_int (xhash_table (hash_table)->size); | |
| 1412 } | |
| 1413 | |
| 1414 DEFUN ("hash-table-rehash-size", Fhash_table_rehash_size, 1, 1, 0, /* | |
| 1415 Return the current rehash size of HASH-TABLE. | |
| 1416 This is a float greater than 1.0; the factor by which HASH-TABLE | |
| 1417 is enlarged when the rehash threshold is exceeded. | |
| 1418 */ | |
| 1419 (hash_table)) | |
| 1420 { | |
| 1421 return make_float (xhash_table (hash_table)->rehash_size); | |
| 1422 } | |
| 1423 | |
| 1424 DEFUN ("hash-table-rehash-threshold", Fhash_table_rehash_threshold, 1, 1, 0, /* | |
| 1425 Return the current rehash threshold of HASH-TABLE. | |
| 1426 This is a float between 0.0 and 1.0; the maximum `load factor' of HASH-TABLE, | |
| 1427 beyond which the HASH-TABLE is enlarged by rehashing. | |
| 1428 */ | |
| 1429 (hash_table)) | |
| 1430 { | |
| 438 | 1431 return make_float (xhash_table (hash_table)->rehash_threshold); |
| 428 | 1432 } |
| 1433 | |
| 1434 DEFUN ("hash-table-weakness", Fhash_table_weakness, 1, 1, 0, /* | |
| 1435 Return the weakness of HASH-TABLE. | |
| 442 | 1436 This can be one of `nil', `key-and-value', `key-or-value', `key' or `value'. |
| 428 | 1437 */ |
| 1438 (hash_table)) | |
| 1439 { | |
| 1440 switch (xhash_table (hash_table)->weakness) | |
| 1441 { | |
| 442 | 1442 case HASH_TABLE_WEAK: return Qkey_and_value; |
| 1443 case HASH_TABLE_KEY_WEAK: return Qkey; | |
| 1444 case HASH_TABLE_KEY_VALUE_WEAK: return Qkey_or_value; | |
| 1445 case HASH_TABLE_VALUE_WEAK: return Qvalue; | |
| 1446 default: return Qnil; | |
| 428 | 1447 } |
| 1448 } | |
| 1449 | |
| 1450 /* obsolete as of 19990901 in xemacs-21.2 */ | |
| 1451 DEFUN ("hash-table-type", Fhash_table_type, 1, 1, 0, /* | |
| 1452 Return the type of HASH-TABLE. | |
| 1453 This can be one of `non-weak', `weak', `key-weak' or `value-weak'. | |
| 1454 */ | |
| 1455 (hash_table)) | |
| 1456 { | |
| 1457 switch (xhash_table (hash_table)->weakness) | |
| 1458 { | |
| 442 | 1459 case HASH_TABLE_WEAK: return Qweak; |
| 1460 case HASH_TABLE_KEY_WEAK: return Qkey_weak; | |
| 1461 case HASH_TABLE_KEY_VALUE_WEAK: return Qkey_or_value_weak; | |
| 1462 case HASH_TABLE_VALUE_WEAK: return Qvalue_weak; | |
| 1463 default: return Qnon_weak; | |
| 428 | 1464 } |
| 1465 } | |
| 1466 | |
| 1467 /************************************************************************/ | |
| 1468 /* Mapping Functions */ | |
| 1469 /************************************************************************/ | |
| 489 | 1470 |
| 1471 /* We need to be careful when mapping over hash tables because the | |
| 1472 hash table might be modified during the mapping operation: | |
| 1473 - by the mapping function | |
| 1474 - by gc (if the hash table is weak) | |
| 1475 | |
| 1476 So we make a copy of the hentries at the beginning of the mapping | |
| 497 | 1477 operation, and iterate over the copy. Naturally, this is |
| 1478 expensive, but not as expensive as you might think, because no | |
| 1479 actual memory has to be collected by our notoriously inefficient | |
| 1480 GC; we use an unwind-protect instead to free the memory directly. | |
| 1481 | |
| 1482 We could avoid the copying by having the hash table modifiers | |
| 1483 puthash and remhash check for currently active mapping functions. | |
| 1484 Disadvantages: it's hard to get right, and IMO hash mapping | |
| 1485 functions are basically rare, and no extra space in the hash table | |
| 1486 object and no extra cpu in puthash or remhash should be wasted to | |
| 1487 make maphash 3% faster. From a design point of view, the basic | |
| 1488 functions gethash, puthash and remhash should be implementable | |
| 1489 without having to think about maphash. | |
| 1490 | |
| 1491 Note: We don't (yet) have Common Lisp's with-hash-table-iterator. | |
| 1492 If you implement this naively, you cannot have more than one | |
| 1493 concurrently active iterator over the same hash table. The `each' | |
| 1494 function in perl has this limitation. | |
| 1495 | |
| 1496 Note: We GCPRO memory on the heap, not on the stack. There is no | |
| 1497 obvious reason why this is bad, but as of this writing this is the | |
| 1498 only known occurrence of this technique in the code. | |
| 504 | 1499 |
| 1500 -- Martin | |
| 1501 */ | |
| 1502 | |
| 1503 /* Ben disagrees with the "copying hentries" design, and says: | |
| 1504 | |
| 1505 Another solution is the same as I've already proposed -- when | |
| 1506 mapping, mark the table as "change-unsafe", and in this case, use a | |
| 1507 secondary table to maintain changes. this could be basically a | |
| 1508 standard hash table, but with entries only for added or deleted | |
| 1509 entries in the primary table, and a marker like Qunbound to | |
| 1510 indicate a deleted entry. puthash, gethash and remhash need a | |
| 1511 single extra check for this secondary table -- totally | |
| 1512 insignificant speedwise. if you really cared about making | |
| 1513 recursive maphashes completely correct, you'd have to do a bit of | |
| 1514 extra work here -- when maphashing, if the secondary table exists, | |
| 1515 make a copy of it, and use the copy in conjunction with the primary | |
| 1516 table when mapping. the advantages of this are | |
| 1517 | |
| 1518 [a] easy to demonstrate correct, even with weak hashtables. | |
| 1519 | |
| 1520 [b] no extra overhead in the general maphash case -- only when you | |
| 1521 modify the table while maphashing, and even then the overhead is | |
| 1522 very small. | |
| 497 | 1523 */ |
| 1524 | |
| 489 | 1525 static Lisp_Object |
| 1526 maphash_unwind (Lisp_Object unwind_obj) | |
| 1527 { | |
| 1528 void *ptr = (void *) get_opaque_ptr (unwind_obj); | |
|
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1529 xfree (ptr); |
| 489 | 1530 free_opaque_ptr (unwind_obj); |
| 1531 return Qnil; | |
| 1532 } | |
| 1533 | |
| 1534 /* Return a malloced array of alternating key/value pairs from HT. */ | |
| 1535 static Lisp_Object * | |
| 1536 copy_compress_hentries (const Lisp_Hash_Table *ht) | |
| 1537 { | |
| 1538 Lisp_Object * const objs = | |
| 1539 /* If the hash table is empty, ht->count could be 0. */ | |
| 1540 xnew_array (Lisp_Object, 2 * (ht->count > 0 ? ht->count : 1)); | |
| 1204 | 1541 const htentry *e, *sentinel; |
| 489 | 1542 Lisp_Object *pobj; |
| 1543 | |
| 1544 for (e = ht->hentries, sentinel = e + ht->size, pobj = objs; e < sentinel; e++) | |
| 1204 | 1545 if (!HTENTRY_CLEAR_P (e)) |
| 489 | 1546 { |
| 1547 *(pobj++) = e->key; | |
| 1548 *(pobj++) = e->value; | |
| 1549 } | |
| 1550 | |
| 1551 type_checking_assert (pobj == objs + 2 * ht->count); | |
| 1552 | |
| 1553 return objs; | |
| 1554 } | |
| 1555 | |
| 428 | 1556 DEFUN ("maphash", Fmaphash, 2, 2, 0, /* |
| 1557 Map FUNCTION over entries in HASH-TABLE, calling it with two args, | |
| 1558 each key and value in HASH-TABLE. | |
| 1559 | |
| 489 | 1560 FUNCTION must not modify HASH-TABLE, with the one exception that FUNCTION |
| 428 | 1561 may remhash or puthash the entry currently being processed by FUNCTION. |
| 1562 */ | |
| 1563 (function, hash_table)) | |
| 1564 { | |
| 489 | 1565 const Lisp_Hash_Table * const ht = xhash_table (hash_table); |
| 1566 Lisp_Object * const objs = copy_compress_hentries (ht); | |
| 1567 Lisp_Object args[3]; | |
| 1568 const Lisp_Object *pobj, *end; | |
| 1569 int speccount = specpdl_depth (); | |
| 1570 struct gcpro gcpro1; | |
| 1571 | |
| 1572 record_unwind_protect (maphash_unwind, make_opaque_ptr ((void *)objs)); | |
| 1573 GCPRO1 (objs[0]); | |
| 1574 gcpro1.nvars = 2 * ht->count; | |
| 428 | 1575 |
| 489 | 1576 args[0] = function; |
| 1577 | |
| 1578 for (pobj = objs, end = pobj + 2 * ht->count; pobj < end; pobj += 2) | |
| 1579 { | |
| 1580 args[1] = pobj[0]; | |
| 1581 args[2] = pobj[1]; | |
| 1582 Ffuncall (countof (args), args); | |
| 1583 } | |
| 1584 | |
| 771 | 1585 unbind_to (speccount); |
| 489 | 1586 UNGCPRO; |
| 428 | 1587 |
| 1588 return Qnil; | |
| 1589 } | |
| 1590 | |
| 489 | 1591 /* Map *C* function FUNCTION over the elements of a non-weak lisp hash table. |
| 1592 FUNCTION must not modify HASH-TABLE, with the one exception that FUNCTION | |
| 1593 may puthash the entry currently being processed by FUNCTION. | |
| 1594 Mapping terminates if FUNCTION returns something other than 0. */ | |
| 428 | 1595 void |
| 489 | 1596 elisp_maphash_unsafe (maphash_function_t function, |
| 428 | 1597 Lisp_Object hash_table, void *extra_arg) |
| 1598 { | |
| 442 | 1599 const Lisp_Hash_Table *ht = XHASH_TABLE (hash_table); |
| 1204 | 1600 const htentry *e, *sentinel; |
| 428 | 1601 |
| 1602 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++) | |
| 1204 | 1603 if (!HTENTRY_CLEAR_P (e)) |
| 489 | 1604 if (function (e->key, e->value, extra_arg)) |
| 1605 return; | |
| 428 | 1606 } |
| 1607 | |
| 489 | 1608 /* Map *C* function FUNCTION over the elements of a lisp hash table. |
| 1609 It is safe for FUNCTION to modify HASH-TABLE. | |
| 1610 Mapping terminates if FUNCTION returns something other than 0. */ | |
| 1611 void | |
| 1612 elisp_maphash (maphash_function_t function, | |
| 1613 Lisp_Object hash_table, void *extra_arg) | |
| 1614 { | |
| 1615 const Lisp_Hash_Table * const ht = xhash_table (hash_table); | |
| 1616 Lisp_Object * const objs = copy_compress_hentries (ht); | |
| 1617 const Lisp_Object *pobj, *end; | |
| 1618 int speccount = specpdl_depth (); | |
| 1619 struct gcpro gcpro1; | |
| 1620 | |
| 1621 record_unwind_protect (maphash_unwind, make_opaque_ptr ((void *)objs)); | |
| 1622 GCPRO1 (objs[0]); | |
| 1623 gcpro1.nvars = 2 * ht->count; | |
| 1624 | |
| 1625 for (pobj = objs, end = pobj + 2 * ht->count; pobj < end; pobj += 2) | |
| 1626 if (function (pobj[0], pobj[1], extra_arg)) | |
| 1627 break; | |
| 1628 | |
| 771 | 1629 unbind_to (speccount); |
| 489 | 1630 UNGCPRO; |
| 1631 } | |
| 1632 | |
| 1633 /* Remove all elements of a lisp hash table satisfying *C* predicate PREDICATE. | |
| 1634 PREDICATE must not modify HASH-TABLE. */ | |
| 428 | 1635 void |
| 1636 elisp_map_remhash (maphash_function_t predicate, | |
| 1637 Lisp_Object hash_table, void *extra_arg) | |
| 1638 { | |
| 489 | 1639 const Lisp_Hash_Table * const ht = xhash_table (hash_table); |
| 1640 Lisp_Object * const objs = copy_compress_hentries (ht); | |
| 1641 const Lisp_Object *pobj, *end; | |
| 1642 int speccount = specpdl_depth (); | |
| 1643 struct gcpro gcpro1; | |
| 428 | 1644 |
| 489 | 1645 record_unwind_protect (maphash_unwind, make_opaque_ptr ((void *)objs)); |
| 1646 GCPRO1 (objs[0]); | |
| 1647 gcpro1.nvars = 2 * ht->count; | |
| 1648 | |
| 1649 for (pobj = objs, end = pobj + 2 * ht->count; pobj < end; pobj += 2) | |
| 1650 if (predicate (pobj[0], pobj[1], extra_arg)) | |
| 1651 Fremhash (pobj[0], hash_table); | |
| 1652 | |
| 771 | 1653 unbind_to (speccount); |
| 489 | 1654 UNGCPRO; |
| 428 | 1655 } |
| 1656 | |
| 1657 | |
| 1658 /************************************************************************/ | |
| 1659 /* garbage collecting weak hash tables */ | |
| 1660 /************************************************************************/ | |
| 1598 | 1661 #ifdef USE_KKCC |
| 2645 | 1662 #define MARK_OBJ(obj) do { \ |
| 1663 Lisp_Object mo_obj = (obj); \ | |
| 1664 if (!marked_p (mo_obj)) \ | |
| 1665 { \ | |
|
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|
1666 kkcc_gc_stack_push_lisp_object_0 (mo_obj); \ |
| 2645 | 1667 did_mark = 1; \ |
| 1668 } \ | |
| 1598 | 1669 } while (0) |
| 1670 | |
| 1671 #else /* NO USE_KKCC */ | |
| 1672 | |
| 442 | 1673 #define MARK_OBJ(obj) do { \ |
| 1674 Lisp_Object mo_obj = (obj); \ | |
| 1675 if (!marked_p (mo_obj)) \ | |
| 1676 { \ | |
| 1677 mark_object (mo_obj); \ | |
| 1678 did_mark = 1; \ | |
| 1679 } \ | |
| 1680 } while (0) | |
| 1598 | 1681 #endif /*NO USE_KKCC */ |
| 442 | 1682 |
| 428 | 1683 |
| 1684 /* Complete the marking for semi-weak hash tables. */ | |
| 1685 int | |
| 1686 finish_marking_weak_hash_tables (void) | |
| 1687 { | |
| 1688 Lisp_Object hash_table; | |
| 1689 int did_mark = 0; | |
| 1690 | |
| 1691 for (hash_table = Vall_weak_hash_tables; | |
| 1692 !NILP (hash_table); | |
| 1693 hash_table = XHASH_TABLE (hash_table)->next_weak) | |
| 1694 { | |
| 442 | 1695 const Lisp_Hash_Table *ht = XHASH_TABLE (hash_table); |
| 1204 | 1696 const htentry *e = ht->hentries; |
| 1697 const htentry *sentinel = e + ht->size; | |
| 428 | 1698 |
| 1699 if (! marked_p (hash_table)) | |
| 1700 /* The hash table is probably garbage. Ignore it. */ | |
| 1701 continue; | |
| 1702 | |
| 1703 /* Now, scan over all the pairs. For all pairs that are | |
| 1704 half-marked, we may need to mark the other half if we're | |
| 1705 keeping this pair. */ | |
| 1706 switch (ht->weakness) | |
| 1707 { | |
| 1708 case HASH_TABLE_KEY_WEAK: | |
| 1709 for (; e < sentinel; e++) | |
| 1204 | 1710 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1711 if (marked_p (e->key)) |
| 1712 MARK_OBJ (e->value); | |
| 1713 break; | |
| 1714 | |
| 1715 case HASH_TABLE_VALUE_WEAK: | |
| 1716 for (; e < sentinel; e++) | |
| 1204 | 1717 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1718 if (marked_p (e->value)) |
| 1719 MARK_OBJ (e->key); | |
| 1720 break; | |
| 1721 | |
| 442 | 1722 case HASH_TABLE_KEY_VALUE_WEAK: |
| 1723 for (; e < sentinel; e++) | |
| 1204 | 1724 if (!HTENTRY_CLEAR_P (e)) |
| 442 | 1725 { |
| 1726 if (marked_p (e->value)) | |
| 1727 MARK_OBJ (e->key); | |
| 1728 else if (marked_p (e->key)) | |
| 1729 MARK_OBJ (e->value); | |
| 1730 } | |
| 1731 break; | |
| 1732 | |
| 428 | 1733 case HASH_TABLE_KEY_CAR_WEAK: |
| 1734 for (; e < sentinel; e++) | |
| 1204 | 1735 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1736 if (!CONSP (e->key) || marked_p (XCAR (e->key))) |
| 1737 { | |
| 1738 MARK_OBJ (e->key); | |
| 1739 MARK_OBJ (e->value); | |
| 1740 } | |
| 1741 break; | |
| 1742 | |
| 450 | 1743 /* We seem to be sprouting new weakness types at an alarming |
| 1744 rate. At least this is not externally visible - and in | |
| 1745 fact all of these KEY_CAR_* types are only used by the | |
| 1746 glyph code. */ | |
| 1747 case HASH_TABLE_KEY_CAR_VALUE_WEAK: | |
| 1748 for (; e < sentinel; e++) | |
| 1204 | 1749 if (!HTENTRY_CLEAR_P (e)) |
| 450 | 1750 { |
| 1751 if (!CONSP (e->key) || marked_p (XCAR (e->key))) | |
| 1752 { | |
| 1753 MARK_OBJ (e->key); | |
| 1754 MARK_OBJ (e->value); | |
| 1755 } | |
| 1756 else if (marked_p (e->value)) | |
| 1757 MARK_OBJ (e->key); | |
| 1758 } | |
| 1759 break; | |
| 1760 | |
| 428 | 1761 case HASH_TABLE_VALUE_CAR_WEAK: |
| 1762 for (; e < sentinel; e++) | |
| 1204 | 1763 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1764 if (!CONSP (e->value) || marked_p (XCAR (e->value))) |
| 1765 { | |
| 1766 MARK_OBJ (e->key); | |
| 1767 MARK_OBJ (e->value); | |
| 1768 } | |
| 1769 break; | |
| 1770 | |
| 1771 default: | |
| 1772 break; | |
| 1773 } | |
| 1774 } | |
| 1775 | |
| 1776 return did_mark; | |
| 1777 } | |
| 1778 | |
| 1779 void | |
| 1780 prune_weak_hash_tables (void) | |
| 1781 { | |
| 1782 Lisp_Object hash_table, prev = Qnil; | |
| 1783 for (hash_table = Vall_weak_hash_tables; | |
| 1784 !NILP (hash_table); | |
| 1785 hash_table = XHASH_TABLE (hash_table)->next_weak) | |
| 1786 { | |
| 1787 if (! marked_p (hash_table)) | |
| 1788 { | |
| 1789 /* This hash table itself is garbage. Remove it from the list. */ | |
| 1790 if (NILP (prev)) | |
| 1791 Vall_weak_hash_tables = XHASH_TABLE (hash_table)->next_weak; | |
| 1792 else | |
| 1793 XHASH_TABLE (prev)->next_weak = XHASH_TABLE (hash_table)->next_weak; | |
| 1794 } | |
| 1795 else | |
| 1796 { | |
| 1797 /* Now, scan over all the pairs. Remove all of the pairs | |
| 1798 in which the key or value, or both, is unmarked | |
| 1799 (depending on the weakness of the hash table). */ | |
| 1800 Lisp_Hash_Table *ht = XHASH_TABLE (hash_table); | |
| 1204 | 1801 htentry *entries = ht->hentries; |
| 1802 htentry *sentinel = entries + ht->size; | |
| 1803 htentry *e; | |
| 428 | 1804 |
| 1805 for (e = entries; e < sentinel; e++) | |
| 1204 | 1806 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1807 { |
| 1808 again: | |
| 1809 if (!marked_p (e->key) || !marked_p (e->value)) | |
| 1810 { | |
| 1811 remhash_1 (ht, entries, e); | |
| 1204 | 1812 if (!HTENTRY_CLEAR_P (e)) |
| 428 | 1813 goto again; |
| 1814 } | |
| 1815 } | |
| 1816 | |
| 1817 prev = hash_table; | |
| 1818 } | |
| 1819 } | |
| 1820 } | |
| 1821 | |
| 1822 /* Return a hash value for an array of Lisp_Objects of size SIZE. */ | |
| 1823 | |
| 665 | 1824 Hashcode |
|
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1825 internal_array_hash (Lisp_Object *arr, int size, int depth, Boolint equalp) |
| 428 | 1826 { |
| 1827 int i; | |
| 665 | 1828 Hashcode hash = 0; |
| 442 | 1829 depth++; |
| 428 | 1830 |
| 1831 if (size <= 5) | |
| 1832 { | |
| 1833 for (i = 0; i < size; i++) | |
|
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|
1834 hash = HASH2 (hash, internal_hash (arr[i], depth, equalp)); |
| 428 | 1835 return hash; |
| 1836 } | |
| 1837 | |
| 1838 /* just pick five elements scattered throughout the array. | |
| 1839 A slightly better approach would be to offset by some | |
| 1840 noise factor from the points chosen below. */ | |
| 1841 for (i = 0; i < 5; i++) | |
|
5191
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1842 hash = HASH2 (hash, internal_hash (arr[i*size/5], depth, equalp)); |
| 428 | 1843 |
| 1844 return hash; | |
| 1845 } | |
| 1846 | |
|
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1847 /* This needs to be algorithmically the same as |
|
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1848 internal_array_hash(). Unfortunately, for strings with non-ASCII content, |
|
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1849 it has to be O(2N), I don't see a reasonable alternative to hashing |
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1850 sequence relying on their length. It is O(1) for pure ASCII strings, |
|
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1851 though. */ |
|
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1852 |
|
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1853 static Hashcode |
|
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1854 string_equalp_hash (Lisp_Object string) |
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1855 { |
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1856 Bytecount len = XSTRING_LENGTH (string), |
|
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1857 ascii_begin = (Bytecount) XSTRING_ASCII_BEGIN (string); |
|
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1858 const Ibyte *ptr = XSTRING_DATA (string), *pend = ptr + len; |
|
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1859 Charcount clen; |
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1860 Hashcode hash = 0; |
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1861 |
|
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1862 if (len == ascii_begin) |
|
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1863 { |
|
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1864 clen = len; |
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1865 } |
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1866 else |
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1867 { |
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1868 clen = string_char_length (string); |
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1869 } |
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1870 |
|
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1871 if (clen <= 5) |
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1872 { |
|
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1873 while (ptr < pend) |
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1874 { |
|
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1875 hash = HASH2 (hash, |
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1876 LISP_HASH (make_char (CANONCASE (NULL, |
|
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1877 itext_ichar (ptr))))); |
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1878 INC_IBYTEPTR (ptr); |
|
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1879 } |
|
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1880 } |
|
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1881 else |
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1882 { |
|
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1883 int ii; |
|
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1884 |
|
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1885 if (clen == len) |
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1886 { |
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1887 for (ii = 0; ii < 5; ii++) |
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1888 { |
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1889 hash = HASH2 (hash, |
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1890 LISP_HASH (make_char |
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1891 (CANONCASE (NULL, |
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1892 ptr[ii * clen / 5])))); |
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1893 } |
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1894 } |
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1895 else |
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1896 { |
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1897 Charcount this_char = 0, last_char = 0; |
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1898 for (ii = 0; ii < 5; ii++) |
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1899 { |
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1900 this_char = ii * clen / 5; |
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1901 ptr = itext_n_addr (ptr, this_char - last_char); |
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1902 last_char = this_char; |
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1903 |
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1904 hash = HASH2 (hash, |
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1905 LISP_HASH (make_char |
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1906 (CANONCASE (NULL, itext_ichar (ptr))))); |
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1907 } |
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1908 } |
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1909 } |
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1910 |
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1911 return HASH2 (clen, hash); |
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1912 } |
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1913 |
| 428 | 1914 /* Return a hash value for a Lisp_Object. This is for use when hashing |
| 1915 objects with the comparison being `equal' (for `eq', you can just | |
| 1916 use the Lisp_Object itself as the hash value). You need to make a | |
| 1917 tradeoff between the speed of the hash function and how good the | |
| 1918 hashing is. In particular, the hash function needs to be FAST, | |
| 1919 so you can't just traipse down the whole tree hashing everything | |
| 1920 together. Most of the time, objects will differ in the first | |
| 1921 few elements you hash. Thus, we only go to a short depth (5) | |
| 1922 and only hash at most 5 elements out of a vector. Theoretically | |
| 1923 we could still take 5^5 time (a big big number) to compute a | |
| 1924 hash, but practically this won't ever happen. */ | |
| 1925 | |
| 665 | 1926 Hashcode |
|
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1927 internal_hash (Lisp_Object obj, int depth, Boolint equalp) |
| 428 | 1928 { |
| 1929 if (depth > 5) | |
| 1930 return 0; | |
|
4398
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1931 |
|
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1932 if (CONSP (obj)) |
| 428 | 1933 { |
|
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1934 Hashcode hash, h; |
|
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1935 int s; |
|
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1936 |
|
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1937 depth += 1; |
|
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1938 |
|
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1939 if (!CONSP (XCDR (obj))) |
|
4398
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1940 { |
|
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1941 /* special case for '(a . b) conses */ |
|
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1942 return HASH2 (internal_hash (XCAR(obj), depth, equalp), |
|
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1943 internal_hash (XCDR (obj), depth, equalp)); |
|
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1944 } |
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1945 |
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1946 /* Don't simply tail recurse; we want to hash lists with the |
|
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1947 same contents in distinct orders differently. */ |
|
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1948 hash = internal_hash (XCAR (obj), depth, equalp); |
|
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1949 |
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1950 obj = XCDR (obj); |
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1951 for (s = 1; s < 6 && CONSP (obj); obj = XCDR (obj), s++) |
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1952 { |
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1953 h = internal_hash (XCAR (obj), depth, equalp); |
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1954 hash = HASH3 (hash, h, s); |
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1955 } |
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1956 |
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1957 return hash; |
| 428 | 1958 } |
| 1959 if (STRINGP (obj)) | |
| 1960 { | |
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1961 if (equalp) |
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1962 { |
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1963 return string_equalp_hash (obj); |
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1964 } |
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1965 |
| 428 | 1966 return hash_string (XSTRING_DATA (obj), XSTRING_LENGTH (obj)); |
| 1967 } | |
| 1968 if (LRECORDP (obj)) | |
| 1969 { | |
| 442 | 1970 const struct lrecord_implementation |
| 428 | 1971 *imp = XRECORD_LHEADER_IMPLEMENTATION (obj); |
| 1972 if (imp->hash) | |
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1973 return imp->hash (obj, depth, equalp); |
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1974 } |
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1975 |
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1976 if (equalp) |
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1977 { |
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1978 if (CHARP (obj)) |
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1979 { |
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1980 /* Characters and numbers of the same numeric value hash |
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1981 differently, which is fine, they're not equalp. */ |
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1982 return LISP_HASH (make_char (CANONCASE (NULL, XCHAR (obj)))); |
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1983 } |
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1984 |
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1985 if (INTP (obj)) |
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1986 { |
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1987 return FLOAT_HASHCODE_FROM_DOUBLE ((double) (XINT (obj))); |
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1988 } |
| 428 | 1989 } |
| 1990 | |
| 1991 return LISP_HASH (obj); | |
| 1992 } | |
| 1993 | |
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1994 DEFUN ("eq-hash", Feq_hash, 1, 1, 0, /* |
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1995 Return a hash value for OBJECT appropriate for use with `eq.' |
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1996 */ |
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1997 (object)) |
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1998 { |
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1999 return make_integer ((EMACS_INT) XPNTRVAL (object)); |
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2000 } |
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2001 |
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2002 DEFUN ("eql-hash", Feql_hash, 1, 1, 0, /* |
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2003 Return a hash value for OBJECT appropriate for use with `eql.' |
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2004 */ |
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2005 (object)) |
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2006 { |
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2007 EMACS_INT hashed = lisp_object_eql_hash (NULL, object); |
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2008 return make_integer (hashed); |
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2009 } |
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2010 |
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2011 DEFUN ("equal-hash", Fequal_hash, 1, 1, 0, /* |
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2012 Return a hash value for OBJECT appropriate for use with `equal.' |
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2013 \(equal obj1 obj2) implies (= (equal-hash obj1) (equal-hash obj2)). |
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2014 */ |
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2015 (object)) |
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2016 { |
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2017 EMACS_INT hashed = internal_hash (object, 0, 0); |
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2018 return make_integer (hashed); |
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2019 } |
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2020 |
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2021 DEFUN ("equalp-hash", Fequalp_hash, 1, 1, 0, /* |
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2022 Return a hash value for OBJECT appropriate for use with `equalp.' |
| 428 | 2023 */ |
| 2024 (object)) | |
| 2025 { | |
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2026 EMACS_INT hashed = internal_hash (object, 0, 1); |
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2027 return make_integer (hashed); |
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2028 } |
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2029 |
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2030 static Lisp_Object |
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2031 make_hash_table_test (Lisp_Object name, |
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2032 hash_table_equal_function_t equal_function, |
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2033 hash_table_hash_function_t hash_function, |
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2034 Lisp_Object lisp_equal_function, |
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2035 Lisp_Object lisp_hash_function) |
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2036 { |
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2037 Lisp_Object result = ALLOC_NORMAL_LISP_OBJECT (hash_table_test); |
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2038 Hash_Table_Test *http = XHASH_TABLE_TEST (result); |
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2039 |
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2040 http->name = name; |
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2041 http->equal_function = equal_function; |
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2042 http->hash_function = hash_function; |
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2043 http->lisp_equal_function = lisp_equal_function; |
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2044 http->lisp_hash_function = lisp_hash_function; |
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2045 |
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2046 return result; |
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2047 } |
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2048 |
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2049 Lisp_Object |
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2050 define_hash_table_test (Lisp_Object name, |
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2051 hash_table_equal_function_t equal_function, |
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2052 hash_table_hash_function_t hash_function, |
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2053 Lisp_Object lisp_equal_function, |
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2054 Lisp_Object lisp_hash_function) |
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2055 { |
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2056 Lisp_Object result = make_hash_table_test (name, equal_function, |
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2057 hash_function, |
|
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2058 lisp_equal_function, |
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2059 lisp_hash_function); |
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2060 XWEAK_LIST_LIST (Vhash_table_test_weak_list) |
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2061 = Fcons (Fcons (name, result), |
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2062 XWEAK_LIST_LIST (Vhash_table_test_weak_list)); |
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2063 |
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2064 return result; |
| 428 | 2065 } |
| 2066 | |
|
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2067 DEFUN ("define-hash-table-test", Fdefine_hash_table_test, 3, 3, 0, /* |
|
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2068 Define a new hash table test with name NAME, a symbol. |
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2069 |
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2070 In a hash table created with NAME as its test, use EQUAL-FUNCTION to compare |
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2071 keys, and HASH-FUNCTION for computing hash codes of keys. |
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2072 |
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2073 EQUAL-FUNCTION must be a function taking two arguments and returning non-nil |
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2074 if both arguments are the same. HASH-FUNCTION must be a function taking one |
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2075 argument and returning an integer that is the hash code of the argument. |
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2076 |
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2077 Computation should use the whole value range of the underlying machine long |
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2078 type. In XEmacs this will necessitate bignums for values above |
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2079 `most-positive-fixnum' but below (1+ (* most-positive-fixnum 2)) and |
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2080 analagous values below `most-negative-fixnum'. Relatively poor hashing |
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2081 performance is guaranteed in a build without bignums. |
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2082 |
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2083 This function returns t if successful, and errors if NAME |
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2084 cannot be defined as a hash table test. |
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2085 */ |
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2086 (name, equal_function, hash_function)) |
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2087 { |
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2088 Lisp_Object min, max, lookup; |
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2089 |
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2090 CHECK_SYMBOL (name); |
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2091 |
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2092 lookup = Fassq (name, XWEAK_LIST_LIST (Vhash_table_test_weak_list)); |
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2093 |
|
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2094 if (!NILP (lookup)) |
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2095 { |
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2096 invalid_change ("Cannot redefine existing hash table test", name); |
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2097 } |
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2098 |
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2099 min = Ffunction_min_args (equal_function); |
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2100 max = Ffunction_max_args (equal_function); |
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2101 |
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2102 if (!((XINT (min) <= 2) && (NILP (max) || 2 <= XINT (max)))) |
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2103 { |
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2104 signal_wrong_number_of_arguments_error (equal_function, 2); |
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2105 } |
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2106 |
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2107 min = Ffunction_min_args (hash_function); |
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2108 max = Ffunction_max_args (hash_function); |
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2109 |
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2110 if (!((XINT (min) <= 1) && (NILP (max) || 1 <= XINT (max)))) |
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2111 { |
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2112 signal_wrong_number_of_arguments_error (hash_function, 1); |
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2113 } |
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2114 |
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2115 define_hash_table_test (name, lisp_object_general_equal, |
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2116 lisp_object_general_hash, equal_function, |
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2117 hash_function); |
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2118 return Qt; |
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2119 } |
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2120 |
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2121 DEFUN ("valid-hash-table-test-p", Fvalid_hash_table_test_p, 1, 1, 0, /* |
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2122 Return t if OBJECT names a hash table test, nil otherwise. |
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2123 |
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2124 A valid hash table test is one of the symbols `eq', `eql', `equal', |
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2125 `equalp', or some symbol passed as the NAME argument to |
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2126 `define-hash-table-test'. As a special case, `nil' is regarded as |
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2127 equivalent to `eql'. |
| 428 | 2128 */ |
| 2129 (object)) | |
| 2130 { | |
|
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2131 Lisp_Object lookup; |
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2132 |
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2133 if (NILP (object)) |
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2134 { |
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2135 return Qt; |
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2136 } |
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2137 |
|
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2138 lookup = Fassq (object, XWEAK_LIST_LIST (Vhash_table_test_weak_list)); |
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2139 |
|
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2140 if (!NILP (lookup)) |
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2141 { |
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2142 return Qt; |
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2143 } |
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2144 |
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2145 return Qnil; |
|
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2146 } |
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2147 |
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2148 DEFUN ("hash-table-test-list", Fhash_table_test_list, 0, 0, 0, /* |
|
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|
2149 Return a list of symbols naming valid hash table tests. |
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2150 These can be passed as the value of the TEST keyword to `make-hash-table'. |
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|
2151 This list does not include nil, regarded as equivalent to `eql' by |
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|
2152 `make-hash-table'. |
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|
2153 */ |
|
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2154 ()) |
|
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2155 { |
|
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Add #'equalp as a hash test by default; add #'define-hash-table-test, GNU API
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|
2156 Lisp_Object result = Qnil; |
|
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2157 |
|
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|
2158 LIST_LOOP_2 (test, XWEAK_LIST_LIST (Vhash_table_test_weak_list)) |
|
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2159 { |
|
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Add #'equalp as a hash test by default; add #'define-hash-table-test, GNU API
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2160 if (!UNBOUNDP (XCAR (test))) |
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2161 { |
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2162 result = Fcons (XCAR (test), result); |
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2163 } |
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Add #'equalp as a hash test by default; add #'define-hash-table-test, GNU API
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|
2164 } |
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Add #'equalp as a hash test by default; add #'define-hash-table-test, GNU API
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|
2165 |
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2166 return result; |
| 428 | 2167 } |
|
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2168 |
|
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|
2169 DEFUN ("hash-table-test-equal-function", |
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2170 Fhash_table_test_equal_function, 1, 1, 0, /* |
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2171 Return the comparison function used for hash table test TEST. |
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2172 See `define-hash-table-test' and `make-hash-table'. |
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2173 */ |
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2174 (test)) |
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2175 { |
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2176 Lisp_Object lookup; |
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2177 |
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2178 if (NILP (test)) |
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2179 { |
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2180 test = Qeql; |
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2181 } |
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2182 |
|
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2183 lookup = Fassq (test, XWEAK_LIST_LIST (Vhash_table_test_weak_list)); |
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2184 if (NILP (lookup)) |
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2185 { |
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2186 invalid_argument ("Not a defined hash table test", test); |
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|
2187 } |
| 428 | 2188 |
|
5191
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2189 return XHASH_TABLE_TEST (XCDR (lookup))->lisp_equal_function; |
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Add #'equalp as a hash test by default; add #'define-hash-table-test, GNU API
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2190 } |
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|
2191 |
|
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2192 DEFUN ("hash-table-test-hash-function", |
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Add #'equalp as a hash test by default; add #'define-hash-table-test, GNU API
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2193 Fhash_table_test_hash_function, 1, 1, 0, /* |
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2194 Return the hash function used for hash table test TEST. |
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2195 See `define-hash-table-test' and `make-hash-table'. |
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2196 */ |
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|
2197 (test)) |
|
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2198 { |
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2199 Lisp_Object lookup; |
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|
2200 |
|
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|
2201 if (NILP (test)) |
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2202 { |
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2203 test = Qeql; |
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2204 } |
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2205 |
|
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2206 lookup = Fassq (test, XWEAK_LIST_LIST (Vhash_table_test_weak_list)); |
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2207 if (NILP (lookup)) |
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2208 { |
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|
2209 invalid_argument ("Not a defined hash table test", test); |
|
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|
2210 } |
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|
2211 |
|
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2212 return XHASH_TABLE_TEST (XCDR (lookup))->lisp_hash_function; |
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|
2213 } |
| 428 | 2214 |
| 2215 /************************************************************************/ | |
| 2216 /* initialization */ | |
| 2217 /************************************************************************/ | |
| 2218 | |
| 2219 void | |
|
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|
2220 hash_table_objects_create (void) |
|
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|
2221 { |
|
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|
2222 #ifdef MEMORY_USAGE_STATS |
|
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|
2223 OBJECT_HAS_METHOD (hash_table, memory_usage); |
|
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|
2224 #endif |
|
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|
2225 } |
|
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|
2226 |
|
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|
2227 void |
| 428 | 2228 syms_of_elhash (void) |
| 2229 { | |
| 2230 DEFSUBR (Fhash_table_p); | |
| 2231 DEFSUBR (Fmake_hash_table); | |
| 2232 DEFSUBR (Fcopy_hash_table); | |
| 2233 DEFSUBR (Fgethash); | |
| 2234 DEFSUBR (Fremhash); | |
| 2235 DEFSUBR (Fputhash); | |
| 2236 DEFSUBR (Fclrhash); | |
| 2237 DEFSUBR (Fmaphash); | |
| 2238 DEFSUBR (Fhash_table_count); | |
| 2239 DEFSUBR (Fhash_table_test); | |
| 2240 DEFSUBR (Fhash_table_size); | |
| 2241 DEFSUBR (Fhash_table_rehash_size); | |
| 2242 DEFSUBR (Fhash_table_rehash_threshold); | |
| 2243 DEFSUBR (Fhash_table_weakness); | |
| 2244 DEFSUBR (Fhash_table_type); /* obsolete */ | |
|
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2245 |
|
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|
2246 DEFSUBR (Feq_hash); |
|
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|
2247 DEFSUBR (Feql_hash); |
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2248 DEFSUBR (Fequal_hash); |
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2249 Ffset (intern ("sxhash"), intern ("equal-hash")); |
|
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|
2250 DEFSUBR (Fequalp_hash); |
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2251 |
|
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|
2252 DEFSUBR (Fdefine_hash_table_test); |
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2253 DEFSUBR (Fvalid_hash_table_test_p); |
|
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2254 DEFSUBR (Fhash_table_test_list); |
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2255 DEFSUBR (Fhash_table_test_equal_function); |
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|
2256 DEFSUBR (Fhash_table_test_hash_function); |
| 428 | 2257 |
| 563 | 2258 DEFSYMBOL_MULTIWORD_PREDICATE (Qhash_tablep); |
|
5191
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|
2259 |
| 563 | 2260 DEFSYMBOL (Qhash_table); |
| 2261 DEFSYMBOL (Qhashtable); | |
|
5084
6afe991b8135
Add a PARSE_KEYWORDS macro, use it in #'make-hash-table.
Aidan Kehoe <kehoea@parhasard.net>
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|
2262 DEFSYMBOL (Qmake_hash_table); |
| 563 | 2263 DEFSYMBOL (Qweakness); |
| 2264 DEFSYMBOL (Qvalue); | |
| 2265 DEFSYMBOL (Qkey_or_value); | |
| 2266 DEFSYMBOL (Qkey_and_value); | |
| 2267 DEFSYMBOL (Qrehash_size); | |
| 2268 DEFSYMBOL (Qrehash_threshold); | |
| 428 | 2269 |
| 563 | 2270 DEFSYMBOL (Qweak); /* obsolete */ |
| 2271 DEFSYMBOL (Qkey_weak); /* obsolete */ | |
| 2272 DEFSYMBOL (Qkey_or_value_weak); /* obsolete */ | |
| 2273 DEFSYMBOL (Qvalue_weak); /* obsolete */ | |
| 2274 DEFSYMBOL (Qnon_weak); /* obsolete */ | |
| 428 | 2275 |
|
4820
e6dec75ded0e
Use keywords, not ordinary symbols, in the structure syntax for hash tables.
Aidan Kehoe <kehoea@parhasard.net>
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4779
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|
2276 DEFKEYWORD (Q_data); |
| 563 | 2277 DEFKEYWORD (Q_test); |
| 2278 DEFKEYWORD (Q_size); | |
| 2279 DEFKEYWORD (Q_rehash_size); | |
| 2280 DEFKEYWORD (Q_rehash_threshold); | |
| 2281 DEFKEYWORD (Q_weakness); | |
| 428 | 2282 } |
| 2283 | |
| 2284 void | |
|
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|
2285 vars_of_elhash (void) |
|
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2286 { |
|
5191
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|
2287 Lisp_Object weak_list_list = XWEAK_LIST_LIST (Vhash_table_test_weak_list); |
|
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|
2288 |
|
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|
2289 /* This var was staticpro'd and initialised in |
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2290 init_elhash_once_early, but its Vall_weak_lists isn't sane, since |
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2291 that was done before vars_of_data() was called. Create a sane |
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2292 weak list object now, set its list appropriately, assert that our |
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2293 data haven't been garbage collected. */ |
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2294 assert (!NILP (Fassq (Qeq, weak_list_list))); |
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2295 assert (!NILP (Fassq (Qeql, weak_list_list))); |
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2296 assert (!NILP (Fassq (Qequal, weak_list_list))); |
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2297 assert (!NILP (Fassq (Qequalp, weak_list_list))); |
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2298 assert (4 == XINT (Flength (weak_list_list))); |
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2299 |
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2300 Vhash_table_test_weak_list = make_weak_list (WEAK_LIST_KEY_ASSOC); |
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2301 XWEAK_LIST_LIST (Vhash_table_test_weak_list) = weak_list_list; |
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2302 |
|
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2303 #ifdef MEMORY_USAGE_STATS |
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2304 OBJECT_HAS_PROPERTY |
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2305 (hash_table, memusage_stats_list, list1 (intern ("hash-entries"))); |
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2306 #endif /* MEMORY_USAGE_STATS */ |
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2307 } |
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2308 |
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2309 void |
| 771 | 2310 init_elhash_once_early (void) |
| 428 | 2311 { |
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2312 INIT_LISP_OBJECT (hash_table); |
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2313 INIT_LISP_OBJECT (hash_table_test); |
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2314 |
| 3092 | 2315 #ifdef NEW_GC |
|
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2316 INIT_LISP_OBJECT (hash_table_entry); |
| 3092 | 2317 #endif /* NEW_GC */ |
| 771 | 2318 |
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2319 /* init_elhash_once_early() is called very early, we can't have these |
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2320 DEFSYMBOLs in syms_of_elhash(), unfortunately. */ |
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2321 |
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2322 DEFSYMBOL (Qeq); |
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2323 DEFSYMBOL (Qeql); |
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2324 DEFSYMBOL (Qequal); |
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2325 DEFSYMBOL (Qequalp); |
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2326 |
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2327 DEFSYMBOL (Qeq_hash); |
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2328 DEFSYMBOL (Qeql_hash); |
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2329 DEFSYMBOL (Qequal_hash); |
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2330 DEFSYMBOL (Qequalp_hash); |
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2331 |
| 428 | 2332 /* This must NOT be staticpro'd */ |
| 2333 Vall_weak_hash_tables = Qnil; | |
| 452 | 2334 dump_add_weak_object_chain (&Vall_weak_hash_tables); |
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2335 |
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2336 staticpro (&Vhash_table_test_weak_list); |
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2337 Vhash_table_test_weak_list = make_weak_list (WEAK_LIST_KEY_ASSOC); |
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2338 |
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2339 staticpro (&Vhash_table_test_eq); |
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2340 Vhash_table_test_eq = define_hash_table_test (Qeq, NULL, NULL, Qeq, Qeq_hash); |
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2341 staticpro (&Vhash_table_test_eql); |
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2342 Vhash_table_test_eql |
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2343 = define_hash_table_test (Qeql, lisp_object_eql_equal, |
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2344 lisp_object_eql_hash, Qeql, Qeql_hash); |
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2345 (void) define_hash_table_test (Qequal, lisp_object_equal_equal, |
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2346 lisp_object_equal_hash, Qequal, Qequal_hash); |
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2347 (void) define_hash_table_test (Qequalp, lisp_object_equalp_equal, |
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2348 lisp_object_equalp_hash, Qequalp, Qequalp_hash); |
| 428 | 2349 } |