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428
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1 /* Implementation of the hash table lisp object type.
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2 Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
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3 Copyright (C) 1995, 1996 Ben Wing.
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4 Copyright (C) 1997 Free Software Foundation, Inc.
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5
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6 This file is part of XEmacs.
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7
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8 XEmacs is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 2, or (at your option) any
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11 later version.
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12
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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 MERCNTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with XEmacs; see the file COPYING. If not, write to
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20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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21 Boston, MA 02111-1307, USA. */
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22
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23 /* Synched up with: Not in FSF. */
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24
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25 #include <config.h>
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26 #include "lisp.h"
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27 #include "bytecode.h"
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28 #include "elhash.h"
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29
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30 Lisp_Object Qhash_tablep;
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31 static Lisp_Object Qhashtable, Qhash_table;
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32 static Lisp_Object Qweakness, Qvalue;
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33 static Lisp_Object Vall_weak_hash_tables;
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34 static Lisp_Object Qrehash_size, Qrehash_threshold;
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35 static Lisp_Object Q_size, Q_test, Q_weakness, Q_rehash_size, Q_rehash_threshold;
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36
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37 /* obsolete as of 19990901 in xemacs-21.2 */
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38 static Lisp_Object Qweak, Qkey_weak, Qvalue_weak, Qnon_weak, Q_type;
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39
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40 typedef struct hentry
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41 {
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42 Lisp_Object key;
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43 Lisp_Object value;
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44 } hentry;
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45
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46 struct Lisp_Hash_Table
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47 {
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48 struct lcrecord_header header;
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49 size_t size;
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50 size_t count;
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51 size_t rehash_count;
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52 double rehash_size;
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53 double rehash_threshold;
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54 size_t golden_ratio;
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55 hash_table_hash_function_t hash_function;
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56 hash_table_test_function_t test_function;
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57 hentry *hentries;
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58 enum hash_table_weakness weakness;
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59 Lisp_Object next_weak; /* Used to chain together all of the weak
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60 hash tables. Don't mark through this. */
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61 };
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62 typedef struct Lisp_Hash_Table Lisp_Hash_Table;
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63
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64 #define HENTRY_CLEAR_P(hentry) ((*(EMACS_UINT*)(&((hentry)->key))) == 0)
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65 #define CLEAR_HENTRY(hentry) \
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66 ((*(EMACS_UINT*)(&((hentry)->key))) = 0, \
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67 (*(EMACS_UINT*)(&((hentry)->value))) = 0)
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68
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69 #define HASH_TABLE_DEFAULT_SIZE 16
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70 #define HASH_TABLE_DEFAULT_REHASH_SIZE 1.3
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71 #define HASH_TABLE_MIN_SIZE 10
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72
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434
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73 #define HASH_CODE(key, ht) \
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74 ((((ht)->hash_function ? (ht)->hash_function (key) : LISP_HASH (key)) \
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75 * (ht)->golden_ratio) \
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76 % (ht)->size)
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428
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77
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78 #define KEYS_EQUAL_P(key1, key2, testfun) \
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434
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79 (EQ (key1, key2) || ((testfun) && (testfun) (key1, key2)))
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428
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80
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81 #define LINEAR_PROBING_LOOP(probe, entries, size) \
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82 for (; \
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83 !HENTRY_CLEAR_P (probe) || \
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84 (probe == entries + size ? \
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85 (probe = entries, !HENTRY_CLEAR_P (probe)) : 0); \
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86 probe++)
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87
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88 #ifndef ERROR_CHECK_HASH_TABLE
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89 # ifdef ERROR_CHECK_TYPECHECK
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90 # define ERROR_CHECK_HASH_TABLE 1
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91 # else
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92 # define ERROR_CHECK_HASH_TABLE 0
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93 # endif
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94 #endif
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95
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96 #if ERROR_CHECK_HASH_TABLE
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97 static void
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98 check_hash_table_invariants (Lisp_Hash_Table *ht)
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99 {
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100 assert (ht->count < ht->size);
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101 assert (ht->count <= ht->rehash_count);
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102 assert (ht->rehash_count < ht->size);
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103 assert ((double) ht->count * ht->rehash_threshold - 1 <= (double) ht->rehash_count);
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104 assert (HENTRY_CLEAR_P (ht->hentries + ht->size));
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105 }
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106 #else
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107 #define check_hash_table_invariants(ht)
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108 #endif
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109
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110 /* We use linear probing instead of double hashing, despite its lack
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111 of blessing by Knuth and company, because, as a result of the
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112 increasing discrepancy between CPU speeds and memory speeds, cache
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113 behavior is becoming increasingly important, e.g:
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114
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115 For a trivial loop, the penalty for non-sequential access of an array is:
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116 - a factor of 3-4 on Pentium Pro 200 Mhz
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117 - a factor of 10 on Ultrasparc 300 Mhz */
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118
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119 /* Return a suitable size for a hash table, with at least SIZE slots. */
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120 static size_t
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121 hash_table_size (size_t requested_size)
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122 {
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123 /* Return some prime near, but greater than or equal to, SIZE.
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124 Decades from the time of writing, someone will have a system large
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125 enough that the list below will be too short... */
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126 static CONST size_t primes [] =
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127 {
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128 19, 29, 41, 59, 79, 107, 149, 197, 263, 347, 457, 599, 787, 1031,
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129 1361, 1777, 2333, 3037, 3967, 5167, 6719, 8737, 11369, 14783,
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130 19219, 24989, 32491, 42257, 54941, 71429, 92861, 120721, 156941,
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131 204047, 265271, 344857, 448321, 582821, 757693, 985003, 1280519,
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132 1664681, 2164111, 2813353, 3657361, 4754591, 6180989, 8035301,
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133 10445899, 13579681, 17653589, 22949669, 29834603, 38784989,
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134 50420551, 65546729, 85210757, 110774011, 144006217, 187208107,
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135 243370577, 316381771, 411296309, 534685237, 695090819, 903618083,
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136 1174703521, 1527114613, 1985248999, 2580823717UL, 3355070839UL
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137 };
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138 /* We've heard of binary search. */
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139 int low, high;
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140 for (low = 0, high = countof (primes) - 1; high - low > 1;)
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141 {
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142 /* Loop Invariant: size < primes [high] */
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143 int mid = (low + high) / 2;
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144 if (primes [mid] < requested_size)
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145 low = mid;
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146 else
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147 high = mid;
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148 }
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149 return primes [high];
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150 }
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151
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152
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153 #if 0 /* I don't think these are needed any more.
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154 If using the general lisp_object_equal_*() functions
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155 causes efficiency problems, these can be resurrected. --ben */
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156 /* equality and hash functions for Lisp strings */
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157 int
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158 lisp_string_equal (Lisp_Object str1, Lisp_Object str2)
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159 {
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160 /* This is wrong anyway. You can't use strcmp() on Lisp strings,
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161 because they can contain zero characters. */
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162 return !strcmp ((char *) XSTRING_DATA (str1), (char *) XSTRING_DATA (str2));
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163 }
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164
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165 static hashcode_t
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166 lisp_string_hash (Lisp_Object obj)
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167 {
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168 return hash_string (XSTRING_DATA (str), XSTRING_LENGTH (str));
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169 }
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170
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171 #endif /* 0 */
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172
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173 static int
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174 lisp_object_eql_equal (Lisp_Object obj1, Lisp_Object obj2)
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175 {
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176 return EQ (obj1, obj2) || (FLOATP (obj1) && internal_equal (obj1, obj2, 0));
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177 }
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178
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179 static hashcode_t
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180 lisp_object_eql_hash (Lisp_Object obj)
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181 {
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182 return FLOATP (obj) ? internal_hash (obj, 0) : LISP_HASH (obj);
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183 }
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184
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185 static int
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186 lisp_object_equal_equal (Lisp_Object obj1, Lisp_Object obj2)
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187 {
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188 return internal_equal (obj1, obj2, 0);
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189 }
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190
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191 static hashcode_t
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192 lisp_object_equal_hash (Lisp_Object obj)
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193 {
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194 return internal_hash (obj, 0);
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195 }
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196
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197
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198 static Lisp_Object
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199 mark_hash_table (Lisp_Object obj)
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200 {
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201 Lisp_Hash_Table *ht = XHASH_TABLE (obj);
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202
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203 /* If the hash table is weak, we don't want to mark the keys and
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204 values (we scan over them after everything else has been marked,
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205 and mark or remove them as necessary). */
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206 if (ht->weakness == HASH_TABLE_NON_WEAK)
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207 {
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208 hentry *e, *sentinel;
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209
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210 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++)
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211 if (!HENTRY_CLEAR_P (e))
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212 {
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213 mark_object (e->key);
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214 mark_object (e->value);
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215 }
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216 }
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217 return Qnil;
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218 }
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219
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220 /* Equality of hash tables. Two hash tables are equal when they are of
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221 the same weakness and test function, they have the same number of
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222 elements, and for each key in the hash table, the values are `equal'.
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223
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224 This is similar to Common Lisp `equalp' of hash tables, with the
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225 difference that CL requires the keys to be compared with the test
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226 function, which we don't do. Doing that would require consing, and
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227 consing is a bad idea in `equal'. Anyway, our method should provide
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228 the same result -- if the keys are not equal according to the test
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229 function, then Fgethash() in hash_table_equal_mapper() will fail. */
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230 static int
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231 hash_table_equal (Lisp_Object hash_table1, Lisp_Object hash_table2, int depth)
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232 {
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233 Lisp_Hash_Table *ht1 = XHASH_TABLE (hash_table1);
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234 Lisp_Hash_Table *ht2 = XHASH_TABLE (hash_table2);
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235 hentry *e, *sentinel;
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236
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237 if ((ht1->test_function != ht2->test_function) ||
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238 (ht1->weakness != ht2->weakness) ||
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239 (ht1->count != ht2->count))
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240 return 0;
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241
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242 depth++;
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243
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244 for (e = ht1->hentries, sentinel = e + ht1->size; e < sentinel; e++)
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245 if (!HENTRY_CLEAR_P (e))
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246 /* Look up the key in the other hash table, and compare the values. */
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247 {
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248 Lisp_Object value_in_other = Fgethash (e->key, hash_table2, Qunbound);
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249 if (UNBOUNDP (value_in_other) ||
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250 !internal_equal (e->value, value_in_other, depth))
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251 return 0; /* Give up */
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252 }
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253
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254 return 1;
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255 }
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256
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257 /* Printing hash tables.
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258
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259 This is non-trivial, because we use a readable structure-style
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260 syntax for hash tables. This means that a typical hash table will be
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261 readably printed in the form of:
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262
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263 #s(hash-table size 2 data (key1 value1 key2 value2))
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264
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265 The supported hash table structure keywords and their values are:
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266 `test' (eql (or nil), eq or equal)
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267 `size' (a natnum or nil)
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268 `rehash-size' (a float)
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269 `rehash-threshold' (a float)
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270 `weakness' (nil, t, key or value)
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271 `data' (a list)
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272
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430
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273 If `print-readably' is nil, then a simpler syntax is used, for example
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428
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274
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275 #<hash-table size 2/13 data (key1 value1 key2 value2) 0x874d>
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276
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277 The data is truncated to four pairs, and the rest is shown with
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278 `...'. This printer does not cons. */
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279
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280
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281 /* Print the data of the hash table. This maps through a Lisp
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282 hash table and prints key/value pairs using PRINTCHARFUN. */
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283 static void
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284 print_hash_table_data (Lisp_Hash_Table *ht, Lisp_Object printcharfun)
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285 {
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286 int count = 0;
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287 hentry *e, *sentinel;
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288
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289 write_c_string (" data (", printcharfun);
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290
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291 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++)
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292 if (!HENTRY_CLEAR_P (e))
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293 {
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294 if (count > 0)
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295 write_c_string (" ", printcharfun);
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296 if (!print_readably && count > 3)
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297 {
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298 write_c_string ("...", printcharfun);
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299 break;
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300 }
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301 print_internal (e->key, printcharfun, 1);
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302 write_c_string (" ", printcharfun);
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303 print_internal (e->value, printcharfun, 1);
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304 count++;
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305 }
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306
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307 write_c_string (")", printcharfun);
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308 }
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309
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310 static void
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311 print_hash_table (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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312 {
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313 Lisp_Hash_Table *ht = XHASH_TABLE (obj);
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314 char buf[128];
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315
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316 write_c_string (print_readably ? "#s(hash-table" : "#<hash-table",
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317 printcharfun);
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318
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319 /* These checks have a kludgy look to them, but they are safe.
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320 Due to nature of hashing, you cannot use arbitrary
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321 test functions anyway. */
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322 if (!ht->test_function)
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323 write_c_string (" test eq", printcharfun);
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324 else if (ht->test_function == lisp_object_equal_equal)
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325 write_c_string (" test equal", printcharfun);
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326 else if (ht->test_function == lisp_object_eql_equal)
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327 DO_NOTHING;
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328 else
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329 abort ();
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330
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331 if (ht->count || !print_readably)
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332 {
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333 if (print_readably)
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334 sprintf (buf, " size %lu", (unsigned long) ht->count);
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335 else
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336 sprintf (buf, " size %lu/%lu",
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337 (unsigned long) ht->count,
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338 (unsigned long) ht->size);
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339 write_c_string (buf, printcharfun);
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340 }
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341
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342 if (ht->weakness != HASH_TABLE_NON_WEAK)
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343 {
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344 sprintf (buf, " weakness %s",
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345 (ht->weakness == HASH_TABLE_WEAK ? "t" :
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346 ht->weakness == HASH_TABLE_KEY_WEAK ? "key" :
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347 ht->weakness == HASH_TABLE_VALUE_WEAK ? "value" :
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348 "you-d-better-not-see-this"));
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349 write_c_string (buf, printcharfun);
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350 }
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351
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352 if (ht->count)
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353 print_hash_table_data (ht, printcharfun);
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354
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355 if (print_readably)
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356 write_c_string (")", printcharfun);
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357 else
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358 {
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359 sprintf (buf, " 0x%x>", ht->header.uid);
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360 write_c_string (buf, printcharfun);
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361 }
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362 }
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363
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364 static void
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365 finalize_hash_table (void *header, int for_disksave)
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366 {
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367 if (!for_disksave)
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368 {
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369 Lisp_Hash_Table *ht = (Lisp_Hash_Table *) header;
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370
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371 xfree (ht->hentries);
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372 ht->hentries = 0;
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373 }
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374 }
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375
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376 static const struct lrecord_description hentry_description_1[] = {
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377 { XD_LISP_OBJECT, offsetof(hentry, key), 2 },
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378 { XD_END }
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379 };
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380
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381 static const struct struct_description hentry_description = {
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382 sizeof(hentry),
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383 hentry_description_1
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384 };
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385
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386 const struct lrecord_description hash_table_description[] = {
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|
|
387 { XD_SIZE_T, offsetof(Lisp_Hash_Table, size) },
|
|
|
388 { XD_STRUCT_PTR, offsetof(Lisp_Hash_Table, hentries), XD_INDIRECT(0, 1), &hentry_description },
|
|
|
389 { XD_LO_LINK, offsetof(Lisp_Hash_Table, next_weak) },
|
|
|
390 { XD_END }
|
|
|
391 };
|
|
|
392
|
|
|
393 DEFINE_LRECORD_IMPLEMENTATION ("hash-table", hash_table,
|
|
|
394 mark_hash_table, print_hash_table,
|
|
|
395 finalize_hash_table,
|
|
|
396 /* #### Implement hash_table_hash()! */
|
|
|
397 hash_table_equal, 0,
|
|
|
398 hash_table_description,
|
|
|
399 Lisp_Hash_Table);
|
|
|
400
|
|
|
401 static Lisp_Hash_Table *
|
|
|
402 xhash_table (Lisp_Object hash_table)
|
|
|
403 {
|
|
|
404 if (!gc_in_progress)
|
|
|
405 CHECK_HASH_TABLE (hash_table);
|
|
|
406 check_hash_table_invariants (XHASH_TABLE (hash_table));
|
|
|
407 return XHASH_TABLE (hash_table);
|
|
|
408 }
|
|
|
409
|
|
|
410
|
|
|
411 /************************************************************************/
|
|
|
412 /* Creation of Hash Tables */
|
|
|
413 /************************************************************************/
|
|
|
414
|
|
|
415 /* Creation of hash tables, without error-checking. */
|
|
|
416 static double
|
|
|
417 hash_table_rehash_threshold (Lisp_Hash_Table *ht)
|
|
|
418 {
|
|
|
419 return
|
|
|
420 ht->rehash_threshold > 0.0 ? ht->rehash_threshold :
|
|
|
421 ht->size > 4096 && !ht->test_function ? 0.7 : 0.6;
|
|
|
422 }
|
|
|
423
|
|
|
424 static void
|
|
|
425 compute_hash_table_derived_values (Lisp_Hash_Table *ht)
|
|
|
426 {
|
|
|
427 ht->rehash_count = (size_t)
|
|
|
428 ((double) ht->size * hash_table_rehash_threshold (ht));
|
|
|
429 ht->golden_ratio = (size_t)
|
|
|
430 ((double) ht->size * (.6180339887 / (double) sizeof (Lisp_Object)));
|
|
|
431 }
|
|
|
432
|
|
|
433 Lisp_Object
|
|
|
434 make_general_lisp_hash_table (enum hash_table_test test,
|
|
|
435 size_t size,
|
|
|
436 double rehash_size,
|
|
|
437 double rehash_threshold,
|
|
|
438 enum hash_table_weakness weakness)
|
|
|
439 {
|
|
|
440 Lisp_Object hash_table;
|
|
|
441 Lisp_Hash_Table *ht = alloc_lcrecord_type (Lisp_Hash_Table, &lrecord_hash_table);
|
|
|
442
|
|
|
443 ht->rehash_size = rehash_size;
|
|
|
444 ht->rehash_threshold = rehash_threshold;
|
|
|
445 ht->weakness = weakness;
|
|
|
446
|
|
|
447 switch (test)
|
|
|
448 {
|
|
|
449 case HASH_TABLE_EQ:
|
|
|
450 ht->test_function = 0;
|
|
|
451 ht->hash_function = 0;
|
|
|
452 break;
|
|
|
453
|
|
|
454 case HASH_TABLE_EQL:
|
|
|
455 ht->test_function = lisp_object_eql_equal;
|
|
|
456 ht->hash_function = lisp_object_eql_hash;
|
|
|
457 break;
|
|
|
458
|
|
|
459 case HASH_TABLE_EQUAL:
|
|
|
460 ht->test_function = lisp_object_equal_equal;
|
|
|
461 ht->hash_function = lisp_object_equal_hash;
|
|
|
462 break;
|
|
|
463
|
|
|
464 default:
|
|
|
465 abort ();
|
|
|
466 }
|
|
|
467
|
|
|
468 if (ht->rehash_size <= 0.0)
|
|
|
469 ht->rehash_size = HASH_TABLE_DEFAULT_REHASH_SIZE;
|
|
|
470 if (size < HASH_TABLE_MIN_SIZE)
|
|
|
471 size = HASH_TABLE_MIN_SIZE;
|
|
|
472 if (rehash_threshold < 0.0)
|
|
|
473 rehash_threshold = 0.75;
|
|
|
474 ht->size =
|
|
|
475 hash_table_size ((size_t) ((double) size / hash_table_rehash_threshold (ht)) + 1);
|
|
|
476 ht->count = 0;
|
|
|
477 compute_hash_table_derived_values (ht);
|
|
|
478
|
|
|
479 /* We leave room for one never-occupied sentinel hentry at the end. */
|
|
|
480 ht->hentries = xnew_array (hentry, ht->size + 1);
|
|
|
481
|
|
|
482 {
|
|
|
483 hentry *e, *sentinel;
|
|
|
484 for (e = ht->hentries, sentinel = e + ht->size; e <= sentinel; e++)
|
|
|
485 CLEAR_HENTRY (e);
|
|
|
486 }
|
|
|
487
|
|
|
488 XSETHASH_TABLE (hash_table, ht);
|
|
|
489
|
|
|
490 if (weakness == HASH_TABLE_NON_WEAK)
|
|
|
491 ht->next_weak = Qunbound;
|
|
|
492 else
|
|
|
493 ht->next_weak = Vall_weak_hash_tables, Vall_weak_hash_tables = hash_table;
|
|
|
494
|
|
|
495 return hash_table;
|
|
|
496 }
|
|
|
497
|
|
|
498 Lisp_Object
|
|
|
499 make_lisp_hash_table (size_t size,
|
|
|
500 enum hash_table_weakness weakness,
|
|
|
501 enum hash_table_test test)
|
|
|
502 {
|
|
|
503 return make_general_lisp_hash_table
|
|
|
504 (test, size, HASH_TABLE_DEFAULT_REHASH_SIZE, -1.0, weakness);
|
|
|
505 }
|
|
|
506
|
|
|
507 /* Pretty reading of hash tables.
|
|
|
508
|
|
|
509 Here we use the existing structures mechanism (which is,
|
|
|
510 unfortunately, pretty cumbersome) for validating and instantiating
|
|
|
511 the hash tables. The idea is that the side-effect of reading a
|
|
|
512 #s(hash-table PLIST) object is creation of a hash table with desired
|
|
|
513 properties, and that the hash table is returned. */
|
|
|
514
|
|
|
515 /* Validation functions: each keyword provides its own validation
|
|
|
516 function. The errors should maybe be continuable, but it is
|
|
|
517 unclear how this would cope with ERRB. */
|
|
|
518 static int
|
|
|
519 hash_table_size_validate (Lisp_Object keyword, Lisp_Object value,
|
|
|
520 Error_behavior errb)
|
|
|
521 {
|
|
|
522 if (NATNUMP (value))
|
|
|
523 return 1;
|
|
|
524
|
|
|
525 maybe_signal_error (Qwrong_type_argument, list2 (Qnatnump, value),
|
|
|
526 Qhash_table, errb);
|
|
|
527 return 0;
|
|
|
528 }
|
|
|
529
|
|
|
530 static size_t
|
|
|
531 decode_hash_table_size (Lisp_Object obj)
|
|
|
532 {
|
|
|
533 return NILP (obj) ? HASH_TABLE_DEFAULT_SIZE : XINT (obj);
|
|
|
534 }
|
|
|
535
|
|
|
536 static int
|
|
|
537 hash_table_weakness_validate (Lisp_Object keyword, Lisp_Object value,
|
|
|
538 Error_behavior errb)
|
|
|
539 {
|
|
|
540 if (EQ (value, Qnil)) return 1;
|
|
|
541 if (EQ (value, Qt)) return 1;
|
|
|
542 if (EQ (value, Qkey)) return 1;
|
|
|
543 if (EQ (value, Qvalue)) return 1;
|
|
|
544
|
|
|
545 /* Following values are obsolete as of 19990901 in xemacs-21.2 */
|
|
|
546 if (EQ (value, Qnon_weak)) return 1;
|
|
|
547 if (EQ (value, Qweak)) return 1;
|
|
|
548 if (EQ (value, Qkey_weak)) return 1;
|
|
|
549 if (EQ (value, Qvalue_weak)) return 1;
|
|
|
550
|
|
|
551 maybe_signal_simple_error ("Invalid hash table weakness",
|
|
|
552 value, Qhash_table, errb);
|
|
|
553 return 0;
|
|
|
554 }
|
|
|
555
|
|
|
556 static enum hash_table_weakness
|
|
|
557 decode_hash_table_weakness (Lisp_Object obj)
|
|
|
558 {
|
|
|
559 if (EQ (obj, Qnil)) return HASH_TABLE_NON_WEAK;
|
|
|
560 if (EQ (obj, Qt)) return HASH_TABLE_WEAK;
|
|
|
561 if (EQ (obj, Qkey)) return HASH_TABLE_KEY_WEAK;
|
|
|
562 if (EQ (obj, Qvalue)) return HASH_TABLE_VALUE_WEAK;
|
|
|
563
|
|
|
564 /* Following values are obsolete as of 19990901 in xemacs-21.2 */
|
|
|
565 if (EQ (obj, Qnon_weak)) return HASH_TABLE_NON_WEAK;
|
|
|
566 if (EQ (obj, Qweak)) return HASH_TABLE_WEAK;
|
|
|
567 if (EQ (obj, Qkey_weak)) return HASH_TABLE_KEY_WEAK;
|
|
|
568 if (EQ (obj, Qvalue_weak)) return HASH_TABLE_VALUE_WEAK;
|
|
|
569
|
|
|
570 signal_simple_error ("Invalid hash table weakness", obj);
|
|
|
571 return HASH_TABLE_NON_WEAK; /* not reached */
|
|
|
572 }
|
|
|
573
|
|
|
574 static int
|
|
|
575 hash_table_test_validate (Lisp_Object keyword, Lisp_Object value,
|
|
|
576 Error_behavior errb)
|
|
|
577 {
|
|
|
578 if (EQ (value, Qnil)) return 1;
|
|
|
579 if (EQ (value, Qeq)) return 1;
|
|
|
580 if (EQ (value, Qequal)) return 1;
|
|
|
581 if (EQ (value, Qeql)) return 1;
|
|
|
582
|
|
|
583 maybe_signal_simple_error ("Invalid hash table test",
|
|
|
584 value, Qhash_table, errb);
|
|
|
585 return 0;
|
|
|
586 }
|
|
|
587
|
|
|
588 static enum hash_table_test
|
|
|
589 decode_hash_table_test (Lisp_Object obj)
|
|
|
590 {
|
|
|
591 if (EQ (obj, Qnil)) return HASH_TABLE_EQL;
|
|
|
592 if (EQ (obj, Qeq)) return HASH_TABLE_EQ;
|
|
|
593 if (EQ (obj, Qequal)) return HASH_TABLE_EQUAL;
|
|
|
594 if (EQ (obj, Qeql)) return HASH_TABLE_EQL;
|
|
|
595
|
|
|
596 signal_simple_error ("Invalid hash table test", obj);
|
|
|
597 return HASH_TABLE_EQ; /* not reached */
|
|
|
598 }
|
|
|
599
|
|
|
600 static int
|
|
|
601 hash_table_rehash_size_validate (Lisp_Object keyword, Lisp_Object value,
|
|
|
602 Error_behavior errb)
|
|
|
603 {
|
|
|
604 if (!FLOATP (value))
|
|
|
605 {
|
|
|
606 maybe_signal_error (Qwrong_type_argument, list2 (Qfloatp, value),
|
|
|
607 Qhash_table, errb);
|
|
|
608 return 0;
|
|
|
609 }
|
|
|
610
|
|
|
611 {
|
|
|
612 double rehash_size = XFLOAT_DATA (value);
|
|
|
613 if (rehash_size <= 1.0)
|
|
|
614 {
|
|
|
615 maybe_signal_simple_error
|
|
|
616 ("Hash table rehash size must be greater than 1.0",
|
|
|
617 value, Qhash_table, errb);
|
|
|
618 return 0;
|
|
|
619 }
|
|
|
620 }
|
|
|
621
|
|
|
622 return 1;
|
|
|
623 }
|
|
|
624
|
|
|
625 static double
|
|
|
626 decode_hash_table_rehash_size (Lisp_Object rehash_size)
|
|
|
627 {
|
|
|
628 return NILP (rehash_size) ? -1.0 : XFLOAT_DATA (rehash_size);
|
|
|
629 }
|
|
|
630
|
|
|
631 static int
|
|
|
632 hash_table_rehash_threshold_validate (Lisp_Object keyword, Lisp_Object value,
|
|
|
633 Error_behavior errb)
|
|
|
634 {
|
|
|
635 if (!FLOATP (value))
|
|
|
636 {
|
|
|
637 maybe_signal_error (Qwrong_type_argument, list2 (Qfloatp, value),
|
|
|
638 Qhash_table, errb);
|
|
|
639 return 0;
|
|
|
640 }
|
|
|
641
|
|
|
642 {
|
|
|
643 double rehash_threshold = XFLOAT_DATA (value);
|
|
|
644 if (rehash_threshold <= 0.0 || rehash_threshold >= 1.0)
|
|
|
645 {
|
|
|
646 maybe_signal_simple_error
|
|
|
647 ("Hash table rehash threshold must be between 0.0 and 1.0",
|
|
|
648 value, Qhash_table, errb);
|
|
|
649 return 0;
|
|
|
650 }
|
|
|
651 }
|
|
|
652
|
|
|
653 return 1;
|
|
|
654 }
|
|
|
655
|
|
|
656 static double
|
|
|
657 decode_hash_table_rehash_threshold (Lisp_Object rehash_threshold)
|
|
|
658 {
|
|
|
659 return NILP (rehash_threshold) ? -1.0 : XFLOAT_DATA (rehash_threshold);
|
|
|
660 }
|
|
|
661
|
|
|
662 static int
|
|
|
663 hash_table_data_validate (Lisp_Object keyword, Lisp_Object value,
|
|
|
664 Error_behavior errb)
|
|
|
665 {
|
|
|
666 int len;
|
|
|
667
|
|
|
668 GET_EXTERNAL_LIST_LENGTH (value, len);
|
|
|
669
|
|
|
670 if (len & 1)
|
|
|
671 {
|
|
|
672 maybe_signal_simple_error
|
|
|
673 ("Hash table data must have alternating key/value pairs",
|
|
|
674 value, Qhash_table, errb);
|
|
|
675 return 0;
|
|
|
676 }
|
|
|
677 return 1;
|
|
|
678 }
|
|
|
679
|
|
|
680 /* The actual instantiation of a hash table. This does practically no
|
|
|
681 error checking, because it relies on the fact that the paranoid
|
|
|
682 functions above have error-checked everything to the last details.
|
|
|
683 If this assumption is wrong, we will get a crash immediately (with
|
|
|
684 error-checking compiled in), and we'll know if there is a bug in
|
|
|
685 the structure mechanism. So there. */
|
|
|
686 static Lisp_Object
|
|
|
687 hash_table_instantiate (Lisp_Object plist)
|
|
|
688 {
|
|
|
689 Lisp_Object hash_table;
|
|
|
690 Lisp_Object test = Qnil;
|
|
|
691 Lisp_Object size = Qnil;
|
|
|
692 Lisp_Object rehash_size = Qnil;
|
|
|
693 Lisp_Object rehash_threshold = Qnil;
|
|
|
694 Lisp_Object weakness = Qnil;
|
|
|
695 Lisp_Object data = Qnil;
|
|
|
696
|
|
|
697 while (!NILP (plist))
|
|
|
698 {
|
|
|
699 Lisp_Object key, value;
|
|
|
700 key = XCAR (plist); plist = XCDR (plist);
|
|
|
701 value = XCAR (plist); plist = XCDR (plist);
|
|
|
702
|
|
|
703 if (EQ (key, Qtest)) test = value;
|
|
|
704 else if (EQ (key, Qsize)) size = value;
|
|
|
705 else if (EQ (key, Qrehash_size)) rehash_size = value;
|
|
|
706 else if (EQ (key, Qrehash_threshold)) rehash_threshold = value;
|
|
|
707 else if (EQ (key, Qweakness)) weakness = value;
|
|
|
708 else if (EQ (key, Qdata)) data = value;
|
|
|
709 else if (EQ (key, Qtype))/*obsolete*/ weakness = value;
|
|
|
710 else
|
|
|
711 abort ();
|
|
|
712 }
|
|
|
713
|
|
|
714 /* Create the hash table. */
|
|
|
715 hash_table = make_general_lisp_hash_table
|
|
|
716 (decode_hash_table_test (test),
|
|
|
717 decode_hash_table_size (size),
|
|
|
718 decode_hash_table_rehash_size (rehash_size),
|
|
|
719 decode_hash_table_rehash_threshold (rehash_threshold),
|
|
|
720 decode_hash_table_weakness (weakness));
|
|
|
721
|
|
|
722 /* I'm not sure whether this can GC, but better safe than sorry. */
|
|
|
723 {
|
|
|
724 struct gcpro gcpro1;
|
|
|
725 GCPRO1 (hash_table);
|
|
|
726
|
|
|
727 /* And fill it with data. */
|
|
|
728 while (!NILP (data))
|
|
|
729 {
|
|
|
730 Lisp_Object key, value;
|
|
|
731 key = XCAR (data); data = XCDR (data);
|
|
|
732 value = XCAR (data); data = XCDR (data);
|
|
|
733 Fputhash (key, value, hash_table);
|
|
|
734 }
|
|
|
735 UNGCPRO;
|
|
|
736 }
|
|
|
737
|
|
|
738 return hash_table;
|
|
|
739 }
|
|
|
740
|
|
|
741 static void
|
|
|
742 structure_type_create_hash_table_structure_name (Lisp_Object structure_name)
|
|
|
743 {
|
|
|
744 struct structure_type *st;
|
|
|
745
|
|
|
746 st = define_structure_type (structure_name, 0, hash_table_instantiate);
|
|
|
747 define_structure_type_keyword (st, Qtest, hash_table_test_validate);
|
|
|
748 define_structure_type_keyword (st, Qsize, hash_table_size_validate);
|
|
|
749 define_structure_type_keyword (st, Qrehash_size, hash_table_rehash_size_validate);
|
|
|
750 define_structure_type_keyword (st, Qrehash_threshold, hash_table_rehash_threshold_validate);
|
|
|
751 define_structure_type_keyword (st, Qweakness, hash_table_weakness_validate);
|
|
|
752 define_structure_type_keyword (st, Qdata, hash_table_data_validate);
|
|
|
753
|
|
|
754 /* obsolete as of 19990901 in xemacs-21.2 */
|
|
|
755 define_structure_type_keyword (st, Qtype, hash_table_weakness_validate);
|
|
|
756 }
|
|
|
757
|
|
|
758 /* Create a built-in Lisp structure type named `hash-table'.
|
|
|
759 We make #s(hashtable ...) equivalent to #s(hash-table ...),
|
|
|
760 for backward compatibility.
|
|
|
761 This is called from emacs.c. */
|
|
|
762 void
|
|
|
763 structure_type_create_hash_table (void)
|
|
|
764 {
|
|
|
765 structure_type_create_hash_table_structure_name (Qhash_table);
|
|
|
766 structure_type_create_hash_table_structure_name (Qhashtable); /* compat */
|
|
|
767 }
|
|
|
768
|
|
|
769
|
|
|
770 /************************************************************************/
|
|
|
771 /* Definition of Lisp-visible methods */
|
|
|
772 /************************************************************************/
|
|
|
773
|
|
|
774 DEFUN ("hash-table-p", Fhash_table_p, 1, 1, 0, /*
|
|
|
775 Return t if OBJECT is a hash table, else nil.
|
|
|
776 */
|
|
|
777 (object))
|
|
|
778 {
|
|
|
779 return HASH_TABLEP (object) ? Qt : Qnil;
|
|
|
780 }
|
|
|
781
|
|
|
782 DEFUN ("make-hash-table", Fmake_hash_table, 0, MANY, 0, /*
|
|
|
783 Return a new empty hash table object.
|
|
|
784 Use Common Lisp style keywords to specify hash table properties.
|
|
|
785 (make-hash-table &key test size rehash-size rehash-threshold weakness)
|
|
|
786
|
|
|
787 Keyword :test can be `eq', `eql' (default) or `equal'.
|
|
|
788 Comparison between keys is done using this function.
|
|
|
789 If speed is important, consider using `eq'.
|
|
|
790 When storing strings in the hash table, you will likely need to use `equal'.
|
|
|
791
|
|
|
792 Keyword :size specifies the number of keys likely to be inserted.
|
|
|
793 This number of entries can be inserted without enlarging the hash table.
|
|
|
794
|
|
|
795 Keyword :rehash-size must be a float greater than 1.0, and specifies
|
|
|
796 the factor by which to increase the size of the hash table when enlarging.
|
|
|
797
|
|
|
798 Keyword :rehash-threshold must be a float between 0.0 and 1.0,
|
|
|
799 and specifies the load factor of the hash table which triggers enlarging.
|
|
|
800
|
|
|
801 Non-standard keyword :weakness can be `nil' (default), `t', `key' or `value'.
|
|
|
802
|
|
|
803 A weak hash table is one whose pointers do not count as GC referents:
|
|
|
804 for any key-value pair in the hash table, if the only remaining pointer
|
|
|
805 to either the key or the value is in a weak hash table, then the pair
|
|
|
806 will be removed from the hash table, and the key and value collected.
|
|
|
807 A non-weak hash table (or any other pointer) would prevent the object
|
|
|
808 from being collected.
|
|
|
809
|
|
|
810 A key-weak hash table is similar to a fully-weak hash table except that
|
|
|
811 a key-value pair will be removed only if the key remains unmarked
|
|
|
812 outside of weak hash tables. The pair will remain in the hash table if
|
|
|
813 the key is pointed to by something other than a weak hash table, even
|
|
|
814 if the value is not.
|
|
|
815
|
|
|
816 A value-weak hash table is similar to a fully-weak hash table except
|
|
|
817 that a key-value pair will be removed only if the value remains
|
|
|
818 unmarked outside of weak hash tables. The pair will remain in the
|
|
|
819 hash table if the value is pointed to by something other than a weak
|
|
|
820 hash table, even if the key is not.
|
|
|
821 */
|
|
|
822 (int nargs, Lisp_Object *args))
|
|
|
823 {
|
|
|
824 int i = 0;
|
|
|
825 Lisp_Object test = Qnil;
|
|
|
826 Lisp_Object size = Qnil;
|
|
|
827 Lisp_Object rehash_size = Qnil;
|
|
|
828 Lisp_Object rehash_threshold = Qnil;
|
|
|
829 Lisp_Object weakness = Qnil;
|
|
|
830
|
|
|
831 while (i + 1 < nargs)
|
|
|
832 {
|
|
|
833 Lisp_Object keyword = args[i++];
|
|
|
834 Lisp_Object value = args[i++];
|
|
|
835
|
|
|
836 if (EQ (keyword, Q_test)) test = value;
|
|
|
837 else if (EQ (keyword, Q_size)) size = value;
|
|
|
838 else if (EQ (keyword, Q_rehash_size)) rehash_size = value;
|
|
|
839 else if (EQ (keyword, Q_rehash_threshold)) rehash_threshold = value;
|
|
|
840 else if (EQ (keyword, Q_weakness)) weakness = value;
|
|
|
841 else if (EQ (keyword, Q_type))/*obsolete*/ weakness = value;
|
|
|
842 else signal_simple_error ("Invalid hash table property keyword", keyword);
|
|
|
843 }
|
|
|
844
|
|
|
845 if (i < nargs)
|
|
|
846 signal_simple_error ("Hash table property requires a value", args[i]);
|
|
|
847
|
|
|
848 #define VALIDATE_VAR(var) \
|
|
|
849 if (!NILP (var)) hash_table_##var##_validate (Q##var, var, ERROR_ME);
|
|
|
850
|
|
|
851 VALIDATE_VAR (test);
|
|
|
852 VALIDATE_VAR (size);
|
|
|
853 VALIDATE_VAR (rehash_size);
|
|
|
854 VALIDATE_VAR (rehash_threshold);
|
|
|
855 VALIDATE_VAR (weakness);
|
|
|
856
|
|
|
857 return make_general_lisp_hash_table
|
|
|
858 (decode_hash_table_test (test),
|
|
|
859 decode_hash_table_size (size),
|
|
|
860 decode_hash_table_rehash_size (rehash_size),
|
|
|
861 decode_hash_table_rehash_threshold (rehash_threshold),
|
|
|
862 decode_hash_table_weakness (weakness));
|
|
|
863 }
|
|
|
864
|
|
|
865 DEFUN ("copy-hash-table", Fcopy_hash_table, 1, 1, 0, /*
|
|
|
866 Return a new hash table containing the same keys and values as HASH-TABLE.
|
|
|
867 The keys and values will not themselves be copied.
|
|
|
868 */
|
|
|
869 (hash_table))
|
|
|
870 {
|
|
|
871 CONST Lisp_Hash_Table *ht_old = xhash_table (hash_table);
|
|
|
872 Lisp_Hash_Table *ht = alloc_lcrecord_type (Lisp_Hash_Table, &lrecord_hash_table);
|
|
|
873
|
|
|
874 copy_lcrecord (ht, ht_old);
|
|
|
875
|
|
|
876 ht->hentries = xnew_array (hentry, ht_old->size + 1);
|
|
|
877 memcpy (ht->hentries, ht_old->hentries, (ht_old->size + 1) * sizeof (hentry));
|
|
|
878
|
|
|
879 XSETHASH_TABLE (hash_table, ht);
|
|
|
880
|
|
|
881 if (! EQ (ht->next_weak, Qunbound))
|
|
|
882 {
|
|
|
883 ht->next_weak = Vall_weak_hash_tables;
|
|
|
884 Vall_weak_hash_tables = hash_table;
|
|
|
885 }
|
|
|
886
|
|
|
887 return hash_table;
|
|
|
888 }
|
|
|
889
|
|
|
890 static void
|
|
|
891 resize_hash_table (Lisp_Hash_Table *ht, size_t new_size)
|
|
|
892 {
|
|
|
893 hentry *old_entries, *new_entries, *old_sentinel, *new_sentinel, *e;
|
|
|
894 size_t old_size;
|
|
|
895
|
|
|
896 old_size = ht->size;
|
|
|
897 ht->size = new_size;
|
|
|
898
|
|
|
899 old_entries = ht->hentries;
|
|
|
900
|
|
|
901 ht->hentries = xnew_array (hentry, new_size + 1);
|
|
|
902 new_entries = ht->hentries;
|
|
|
903
|
|
|
904 old_sentinel = old_entries + old_size;
|
|
|
905 new_sentinel = new_entries + new_size;
|
|
|
906
|
|
|
907 for (e = new_entries; e <= new_sentinel; e++)
|
|
|
908 CLEAR_HENTRY (e);
|
|
|
909
|
|
|
910 compute_hash_table_derived_values (ht);
|
|
|
911
|
|
|
912 for (e = old_entries; e < old_sentinel; e++)
|
|
|
913 if (!HENTRY_CLEAR_P (e))
|
|
|
914 {
|
|
|
915 hentry *probe = new_entries + HASH_CODE (e->key, ht);
|
|
|
916 LINEAR_PROBING_LOOP (probe, new_entries, new_size)
|
|
|
917 ;
|
|
|
918 *probe = *e;
|
|
|
919 }
|
|
|
920
|
|
|
921 if (!DUMPEDP (old_entries))
|
|
|
922 xfree (old_entries);
|
|
|
923 }
|
|
|
924
|
|
|
925 void
|
|
|
926 reorganize_hash_table (Lisp_Hash_Table *ht)
|
|
|
927 {
|
|
|
928 resize_hash_table (ht, ht->size);
|
|
|
929 }
|
|
|
930
|
|
|
931 static void
|
|
|
932 enlarge_hash_table (Lisp_Hash_Table *ht)
|
|
|
933 {
|
|
432
|
934 size_t new_size =
|
|
428
|
935 hash_table_size ((size_t) ((double) ht->size * ht->rehash_size));
|
|
|
936 resize_hash_table (ht, new_size);
|
|
|
937 }
|
|
|
938
|
|
|
939 static hentry *
|
|
|
940 find_hentry (Lisp_Object key, CONST Lisp_Hash_Table *ht)
|
|
|
941 {
|
|
|
942 hash_table_test_function_t test_function = ht->test_function;
|
|
|
943 hentry *entries = ht->hentries;
|
|
|
944 hentry *probe = entries + HASH_CODE (key, ht);
|
|
|
945
|
|
|
946 LINEAR_PROBING_LOOP (probe, entries, ht->size)
|
|
|
947 if (KEYS_EQUAL_P (probe->key, key, test_function))
|
|
|
948 break;
|
|
|
949
|
|
|
950 return probe;
|
|
|
951 }
|
|
|
952
|
|
|
953 DEFUN ("gethash", Fgethash, 2, 3, 0, /*
|
|
|
954 Find hash value for KEY in HASH-TABLE.
|
|
|
955 If there is no corresponding value, return DEFAULT (which defaults to nil).
|
|
|
956 */
|
|
|
957 (key, hash_table, default_))
|
|
|
958 {
|
|
|
959 CONST Lisp_Hash_Table *ht = xhash_table (hash_table);
|
|
|
960 hentry *e = find_hentry (key, ht);
|
|
|
961
|
|
|
962 return HENTRY_CLEAR_P (e) ? default_ : e->value;
|
|
|
963 }
|
|
|
964
|
|
|
965 DEFUN ("puthash", Fputhash, 3, 3, 0, /*
|
|
|
966 Hash KEY to VALUE in HASH-TABLE.
|
|
|
967 */
|
|
|
968 (key, value, hash_table))
|
|
|
969 {
|
|
|
970 Lisp_Hash_Table *ht = xhash_table (hash_table);
|
|
|
971 hentry *e = find_hentry (key, ht);
|
|
|
972
|
|
|
973 if (!HENTRY_CLEAR_P (e))
|
|
|
974 return e->value = value;
|
|
|
975
|
|
|
976 e->key = key;
|
|
|
977 e->value = value;
|
|
|
978
|
|
|
979 if (++ht->count >= ht->rehash_count)
|
|
|
980 enlarge_hash_table (ht);
|
|
|
981
|
|
|
982 return value;
|
|
|
983 }
|
|
|
984
|
|
|
985 /* Remove hentry pointed at by PROBE.
|
|
|
986 Subsequent entries are removed and reinserted.
|
|
|
987 We don't use tombstones - too wasteful. */
|
|
|
988 static void
|
|
|
989 remhash_1 (Lisp_Hash_Table *ht, hentry *entries, hentry *probe)
|
|
|
990 {
|
|
|
991 size_t size = ht->size;
|
|
|
992 CLEAR_HENTRY (probe);
|
|
|
993 probe++;
|
|
|
994 ht->count--;
|
|
|
995
|
|
|
996 LINEAR_PROBING_LOOP (probe, entries, size)
|
|
|
997 {
|
|
|
998 Lisp_Object key = probe->key;
|
|
|
999 hentry *probe2 = entries + HASH_CODE (key, ht);
|
|
|
1000 LINEAR_PROBING_LOOP (probe2, entries, size)
|
|
|
1001 if (EQ (probe2->key, key))
|
|
|
1002 /* hentry at probe doesn't need to move. */
|
|
|
1003 goto continue_outer_loop;
|
|
|
1004 /* Move hentry from probe to new home at probe2. */
|
|
|
1005 *probe2 = *probe;
|
|
|
1006 CLEAR_HENTRY (probe);
|
|
|
1007 continue_outer_loop: continue;
|
|
|
1008 }
|
|
|
1009 }
|
|
|
1010
|
|
|
1011 DEFUN ("remhash", Fremhash, 2, 2, 0, /*
|
|
|
1012 Remove the entry for KEY from HASH-TABLE.
|
|
|
1013 Do nothing if there is no entry for KEY in HASH-TABLE.
|
|
|
1014 */
|
|
|
1015 (key, hash_table))
|
|
|
1016 {
|
|
|
1017 Lisp_Hash_Table *ht = xhash_table (hash_table);
|
|
|
1018 hentry *e = find_hentry (key, ht);
|
|
|
1019
|
|
|
1020 if (HENTRY_CLEAR_P (e))
|
|
|
1021 return Qnil;
|
|
|
1022
|
|
|
1023 remhash_1 (ht, ht->hentries, e);
|
|
|
1024 return Qt;
|
|
|
1025 }
|
|
|
1026
|
|
|
1027 DEFUN ("clrhash", Fclrhash, 1, 1, 0, /*
|
|
|
1028 Remove all entries from HASH-TABLE, leaving it empty.
|
|
|
1029 */
|
|
|
1030 (hash_table))
|
|
|
1031 {
|
|
|
1032 Lisp_Hash_Table *ht = xhash_table (hash_table);
|
|
|
1033 hentry *e, *sentinel;
|
|
|
1034
|
|
|
1035 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++)
|
|
|
1036 CLEAR_HENTRY (e);
|
|
|
1037 ht->count = 0;
|
|
|
1038
|
|
|
1039 return hash_table;
|
|
|
1040 }
|
|
|
1041
|
|
|
1042 /************************************************************************/
|
|
|
1043 /* Accessor Functions */
|
|
|
1044 /************************************************************************/
|
|
|
1045
|
|
|
1046 DEFUN ("hash-table-count", Fhash_table_count, 1, 1, 0, /*
|
|
|
1047 Return the number of entries in HASH-TABLE.
|
|
|
1048 */
|
|
|
1049 (hash_table))
|
|
|
1050 {
|
|
|
1051 return make_int (xhash_table (hash_table)->count);
|
|
|
1052 }
|
|
|
1053
|
|
|
1054 DEFUN ("hash-table-test", Fhash_table_test, 1, 1, 0, /*
|
|
|
1055 Return the test function of HASH-TABLE.
|
|
|
1056 This can be one of `eq', `eql' or `equal'.
|
|
|
1057 */
|
|
|
1058 (hash_table))
|
|
|
1059 {
|
|
|
1060 hash_table_test_function_t fun = xhash_table (hash_table)->test_function;
|
|
|
1061
|
|
|
1062 return (fun == lisp_object_eql_equal ? Qeql :
|
|
|
1063 fun == lisp_object_equal_equal ? Qequal :
|
|
|
1064 Qeq);
|
|
|
1065 }
|
|
|
1066
|
|
|
1067 DEFUN ("hash-table-size", Fhash_table_size, 1, 1, 0, /*
|
|
|
1068 Return the size of HASH-TABLE.
|
|
|
1069 This is the current number of slots in HASH-TABLE, whether occupied or not.
|
|
|
1070 */
|
|
|
1071 (hash_table))
|
|
|
1072 {
|
|
|
1073 return make_int (xhash_table (hash_table)->size);
|
|
|
1074 }
|
|
|
1075
|
|
|
1076 DEFUN ("hash-table-rehash-size", Fhash_table_rehash_size, 1, 1, 0, /*
|
|
|
1077 Return the current rehash size of HASH-TABLE.
|
|
|
1078 This is a float greater than 1.0; the factor by which HASH-TABLE
|
|
|
1079 is enlarged when the rehash threshold is exceeded.
|
|
|
1080 */
|
|
|
1081 (hash_table))
|
|
|
1082 {
|
|
|
1083 return make_float (xhash_table (hash_table)->rehash_size);
|
|
|
1084 }
|
|
|
1085
|
|
|
1086 DEFUN ("hash-table-rehash-threshold", Fhash_table_rehash_threshold, 1, 1, 0, /*
|
|
|
1087 Return the current rehash threshold of HASH-TABLE.
|
|
|
1088 This is a float between 0.0 and 1.0; the maximum `load factor' of HASH-TABLE,
|
|
|
1089 beyond which the HASH-TABLE is enlarged by rehashing.
|
|
|
1090 */
|
|
|
1091 (hash_table))
|
|
|
1092 {
|
|
|
1093 return make_float (hash_table_rehash_threshold (xhash_table (hash_table)));
|
|
|
1094 }
|
|
|
1095
|
|
|
1096 DEFUN ("hash-table-weakness", Fhash_table_weakness, 1, 1, 0, /*
|
|
|
1097 Return the weakness of HASH-TABLE.
|
|
|
1098 This can be one of `nil', `t', `key' or `value'.
|
|
|
1099 */
|
|
|
1100 (hash_table))
|
|
|
1101 {
|
|
|
1102 switch (xhash_table (hash_table)->weakness)
|
|
|
1103 {
|
|
|
1104 case HASH_TABLE_WEAK: return Qt;
|
|
|
1105 case HASH_TABLE_KEY_WEAK: return Qkey;
|
|
|
1106 case HASH_TABLE_VALUE_WEAK: return Qvalue;
|
|
|
1107 default: return Qnil;
|
|
|
1108 }
|
|
|
1109 }
|
|
|
1110
|
|
|
1111 /* obsolete as of 19990901 in xemacs-21.2 */
|
|
|
1112 DEFUN ("hash-table-type", Fhash_table_type, 1, 1, 0, /*
|
|
|
1113 Return the type of HASH-TABLE.
|
|
|
1114 This can be one of `non-weak', `weak', `key-weak' or `value-weak'.
|
|
|
1115 */
|
|
|
1116 (hash_table))
|
|
|
1117 {
|
|
|
1118 switch (xhash_table (hash_table)->weakness)
|
|
|
1119 {
|
|
|
1120 case HASH_TABLE_WEAK: return Qweak;
|
|
|
1121 case HASH_TABLE_KEY_WEAK: return Qkey_weak;
|
|
|
1122 case HASH_TABLE_VALUE_WEAK: return Qvalue_weak;
|
|
|
1123 default: return Qnon_weak;
|
|
|
1124 }
|
|
|
1125 }
|
|
|
1126
|
|
|
1127 /************************************************************************/
|
|
|
1128 /* Mapping Functions */
|
|
|
1129 /************************************************************************/
|
|
|
1130 DEFUN ("maphash", Fmaphash, 2, 2, 0, /*
|
|
|
1131 Map FUNCTION over entries in HASH-TABLE, calling it with two args,
|
|
|
1132 each key and value in HASH-TABLE.
|
|
|
1133
|
|
|
1134 FUNCTION may not modify HASH-TABLE, with the one exception that FUNCTION
|
|
|
1135 may remhash or puthash the entry currently being processed by FUNCTION.
|
|
|
1136 */
|
|
|
1137 (function, hash_table))
|
|
|
1138 {
|
|
|
1139 CONST Lisp_Hash_Table *ht = xhash_table (hash_table);
|
|
|
1140 CONST hentry *e, *sentinel;
|
|
|
1141
|
|
|
1142 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++)
|
|
|
1143 if (!HENTRY_CLEAR_P (e))
|
|
|
1144 {
|
|
|
1145 Lisp_Object args[3], key;
|
|
|
1146 again:
|
|
|
1147 key = e->key;
|
|
|
1148 args[0] = function;
|
|
|
1149 args[1] = key;
|
|
|
1150 args[2] = e->value;
|
|
|
1151 Ffuncall (countof (args), args);
|
|
|
1152 /* Has FUNCTION done a remhash? */
|
|
|
1153 if (!EQ (key, e->key) && !HENTRY_CLEAR_P (e))
|
|
|
1154 goto again;
|
|
|
1155 }
|
|
|
1156
|
|
|
1157 return Qnil;
|
|
|
1158 }
|
|
|
1159
|
|
|
1160 /* Map *C* function FUNCTION over the elements of a lisp hash table. */
|
|
|
1161 void
|
|
|
1162 elisp_maphash (maphash_function_t function,
|
|
|
1163 Lisp_Object hash_table, void *extra_arg)
|
|
|
1164 {
|
|
|
1165 CONST Lisp_Hash_Table *ht = XHASH_TABLE (hash_table);
|
|
|
1166 CONST hentry *e, *sentinel;
|
|
|
1167
|
|
|
1168 for (e = ht->hentries, sentinel = e + ht->size; e < sentinel; e++)
|
|
|
1169 if (!HENTRY_CLEAR_P (e))
|
|
|
1170 {
|
|
|
1171 Lisp_Object key;
|
|
|
1172 again:
|
|
|
1173 key = e->key;
|
|
|
1174 if (function (key, e->value, extra_arg))
|
|
|
1175 return;
|
|
|
1176 /* Has FUNCTION done a remhash? */
|
|
|
1177 if (!EQ (key, e->key) && !HENTRY_CLEAR_P (e))
|
|
|
1178 goto again;
|
|
|
1179 }
|
|
|
1180 }
|
|
|
1181
|
|
|
1182 /* Remove all elements of a lisp hash table satisfying *C* predicate PREDICATE. */
|
|
|
1183 void
|
|
|
1184 elisp_map_remhash (maphash_function_t predicate,
|
|
|
1185 Lisp_Object hash_table, void *extra_arg)
|
|
|
1186 {
|
|
|
1187 Lisp_Hash_Table *ht = XHASH_TABLE (hash_table);
|
|
|
1188 hentry *e, *entries, *sentinel;
|
|
|
1189
|
|
|
1190 for (e = entries = ht->hentries, sentinel = e + ht->size; e < sentinel; e++)
|
|
|
1191 if (!HENTRY_CLEAR_P (e))
|
|
|
1192 {
|
|
|
1193 again:
|
|
|
1194 if (predicate (e->key, e->value, extra_arg))
|
|
|
1195 {
|
|
|
1196 remhash_1 (ht, entries, e);
|
|
|
1197 if (!HENTRY_CLEAR_P (e))
|
|
|
1198 goto again;
|
|
|
1199 }
|
|
|
1200 }
|
|
|
1201 }
|
|
|
1202
|
|
|
1203
|
|
|
1204 /************************************************************************/
|
|
|
1205 /* garbage collecting weak hash tables */
|
|
|
1206 /************************************************************************/
|
|
|
1207
|
|
|
1208 /* Complete the marking for semi-weak hash tables. */
|
|
|
1209 int
|
|
|
1210 finish_marking_weak_hash_tables (void)
|
|
|
1211 {
|
|
|
1212 Lisp_Object hash_table;
|
|
|
1213 int did_mark = 0;
|
|
|
1214
|
|
|
1215 for (hash_table = Vall_weak_hash_tables;
|
|
|
1216 !NILP (hash_table);
|
|
|
1217 hash_table = XHASH_TABLE (hash_table)->next_weak)
|
|
|
1218 {
|
|
|
1219 CONST Lisp_Hash_Table *ht = XHASH_TABLE (hash_table);
|
|
|
1220 CONST hentry *e = ht->hentries;
|
|
|
1221 CONST hentry *sentinel = e + ht->size;
|
|
|
1222
|
|
|
1223 if (! marked_p (hash_table))
|
|
|
1224 /* The hash table is probably garbage. Ignore it. */
|
|
|
1225 continue;
|
|
|
1226
|
|
|
1227 /* Now, scan over all the pairs. For all pairs that are
|
|
|
1228 half-marked, we may need to mark the other half if we're
|
|
|
1229 keeping this pair. */
|
|
|
1230 #define MARK_OBJ(obj) \
|
|
|
1231 do { if (!marked_p (obj)) mark_object (obj), did_mark = 1; } while (0)
|
|
|
1232
|
|
|
1233 switch (ht->weakness)
|
|
|
1234 {
|
|
|
1235 case HASH_TABLE_KEY_WEAK:
|
|
|
1236 for (; e < sentinel; e++)
|
|
|
1237 if (!HENTRY_CLEAR_P (e))
|
|
|
1238 if (marked_p (e->key))
|
|
|
1239 MARK_OBJ (e->value);
|
|
|
1240 break;
|
|
|
1241
|
|
|
1242 case HASH_TABLE_VALUE_WEAK:
|
|
|
1243 for (; e < sentinel; e++)
|
|
|
1244 if (!HENTRY_CLEAR_P (e))
|
|
|
1245 if (marked_p (e->value))
|
|
|
1246 MARK_OBJ (e->key);
|
|
|
1247 break;
|
|
|
1248
|
|
|
1249 case HASH_TABLE_KEY_CAR_WEAK:
|
|
|
1250 for (; e < sentinel; e++)
|
|
|
1251 if (!HENTRY_CLEAR_P (e))
|
|
|
1252 if (!CONSP (e->key) || marked_p (XCAR (e->key)))
|
|
|
1253 {
|
|
|
1254 MARK_OBJ (e->key);
|
|
|
1255 MARK_OBJ (e->value);
|
|
|
1256 }
|
|
|
1257 break;
|
|
|
1258
|
|
|
1259 case HASH_TABLE_VALUE_CAR_WEAK:
|
|
|
1260 for (; e < sentinel; e++)
|
|
|
1261 if (!HENTRY_CLEAR_P (e))
|
|
|
1262 if (!CONSP (e->value) || marked_p (XCAR (e->value)))
|
|
|
1263 {
|
|
|
1264 MARK_OBJ (e->key);
|
|
|
1265 MARK_OBJ (e->value);
|
|
|
1266 }
|
|
|
1267 break;
|
|
|
1268
|
|
|
1269 default:
|
|
|
1270 break;
|
|
|
1271 }
|
|
|
1272 }
|
|
|
1273
|
|
|
1274 return did_mark;
|
|
|
1275 }
|
|
|
1276
|
|
|
1277 void
|
|
|
1278 prune_weak_hash_tables (void)
|
|
|
1279 {
|
|
|
1280 Lisp_Object hash_table, prev = Qnil;
|
|
|
1281 for (hash_table = Vall_weak_hash_tables;
|
|
|
1282 !NILP (hash_table);
|
|
|
1283 hash_table = XHASH_TABLE (hash_table)->next_weak)
|
|
|
1284 {
|
|
|
1285 if (! marked_p (hash_table))
|
|
|
1286 {
|
|
|
1287 /* This hash table itself is garbage. Remove it from the list. */
|
|
|
1288 if (NILP (prev))
|
|
|
1289 Vall_weak_hash_tables = XHASH_TABLE (hash_table)->next_weak;
|
|
|
1290 else
|
|
|
1291 XHASH_TABLE (prev)->next_weak = XHASH_TABLE (hash_table)->next_weak;
|
|
|
1292 }
|
|
|
1293 else
|
|
|
1294 {
|
|
|
1295 /* Now, scan over all the pairs. Remove all of the pairs
|
|
|
1296 in which the key or value, or both, is unmarked
|
|
|
1297 (depending on the weakness of the hash table). */
|
|
|
1298 Lisp_Hash_Table *ht = XHASH_TABLE (hash_table);
|
|
|
1299 hentry *entries = ht->hentries;
|
|
|
1300 hentry *sentinel = entries + ht->size;
|
|
|
1301 hentry *e;
|
|
|
1302
|
|
|
1303 for (e = entries; e < sentinel; e++)
|
|
|
1304 if (!HENTRY_CLEAR_P (e))
|
|
|
1305 {
|
|
|
1306 again:
|
|
|
1307 if (!marked_p (e->key) || !marked_p (e->value))
|
|
|
1308 {
|
|
|
1309 remhash_1 (ht, entries, e);
|
|
|
1310 if (!HENTRY_CLEAR_P (e))
|
|
|
1311 goto again;
|
|
|
1312 }
|
|
|
1313 }
|
|
|
1314
|
|
|
1315 prev = hash_table;
|
|
|
1316 }
|
|
|
1317 }
|
|
|
1318 }
|
|
|
1319
|
|
|
1320 /* Return a hash value for an array of Lisp_Objects of size SIZE. */
|
|
|
1321
|
|
|
1322 hashcode_t
|
|
|
1323 internal_array_hash (Lisp_Object *arr, int size, int depth)
|
|
|
1324 {
|
|
|
1325 int i;
|
|
|
1326 unsigned long hash = 0;
|
|
|
1327
|
|
|
1328 if (size <= 5)
|
|
|
1329 {
|
|
|
1330 for (i = 0; i < size; i++)
|
|
|
1331 hash = HASH2 (hash, internal_hash (arr[i], depth + 1));
|
|
|
1332 return hash;
|
|
|
1333 }
|
|
|
1334
|
|
|
1335 /* just pick five elements scattered throughout the array.
|
|
|
1336 A slightly better approach would be to offset by some
|
|
|
1337 noise factor from the points chosen below. */
|
|
|
1338 for (i = 0; i < 5; i++)
|
|
|
1339 hash = HASH2 (hash, internal_hash (arr[i*size/5], depth + 1));
|
|
|
1340
|
|
|
1341 return hash;
|
|
|
1342 }
|
|
|
1343
|
|
|
1344 /* Return a hash value for a Lisp_Object. This is for use when hashing
|
|
|
1345 objects with the comparison being `equal' (for `eq', you can just
|
|
|
1346 use the Lisp_Object itself as the hash value). You need to make a
|
|
|
1347 tradeoff between the speed of the hash function and how good the
|
|
|
1348 hashing is. In particular, the hash function needs to be FAST,
|
|
|
1349 so you can't just traipse down the whole tree hashing everything
|
|
|
1350 together. Most of the time, objects will differ in the first
|
|
|
1351 few elements you hash. Thus, we only go to a short depth (5)
|
|
|
1352 and only hash at most 5 elements out of a vector. Theoretically
|
|
|
1353 we could still take 5^5 time (a big big number) to compute a
|
|
|
1354 hash, but practically this won't ever happen. */
|
|
|
1355
|
|
|
1356 hashcode_t
|
|
|
1357 internal_hash (Lisp_Object obj, int depth)
|
|
|
1358 {
|
|
|
1359 if (depth > 5)
|
|
|
1360 return 0;
|
|
|
1361 if (CONSP (obj))
|
|
|
1362 {
|
|
|
1363 /* no point in worrying about tail recursion, since we're not
|
|
|
1364 going very deep */
|
|
|
1365 return HASH2 (internal_hash (XCAR (obj), depth + 1),
|
|
|
1366 internal_hash (XCDR (obj), depth + 1));
|
|
|
1367 }
|
|
|
1368 if (STRINGP (obj))
|
|
|
1369 {
|
|
|
1370 return hash_string (XSTRING_DATA (obj), XSTRING_LENGTH (obj));
|
|
|
1371 }
|
|
|
1372 if (VECTORP (obj))
|
|
|
1373 {
|
|
|
1374 return HASH2 (XVECTOR_LENGTH (obj),
|
|
|
1375 internal_array_hash (XVECTOR_DATA (obj),
|
|
|
1376 XVECTOR_LENGTH (obj),
|
|
|
1377 depth + 1));
|
|
|
1378 }
|
|
|
1379 if (LRECORDP (obj))
|
|
|
1380 {
|
|
|
1381 CONST struct lrecord_implementation
|
|
|
1382 *imp = XRECORD_LHEADER_IMPLEMENTATION (obj);
|
|
|
1383 if (imp->hash)
|
|
|
1384 return imp->hash (obj, depth);
|
|
|
1385 }
|
|
|
1386
|
|
|
1387 return LISP_HASH (obj);
|
|
|
1388 }
|
|
|
1389
|
|
|
1390 DEFUN ("sxhash", Fsxhash, 1, 1, 0, /*
|
|
|
1391 Return a hash value for OBJECT.
|
|
|
1392 (equal obj1 obj2) implies (= (sxhash obj1) (sxhash obj2)).
|
|
|
1393 */
|
|
|
1394 (object))
|
|
|
1395 {
|
|
|
1396 return make_int (internal_hash (object, 0));
|
|
|
1397 }
|
|
|
1398
|
|
|
1399 #if 0
|
|
|
1400 xxDEFUN ("internal-hash-value", Finternal_hash_value, 1, 1, 0, /*
|
|
|
1401 Hash value of OBJECT. For debugging.
|
|
|
1402 The value is returned as (HIGH . LOW).
|
|
|
1403 */
|
|
|
1404 (object))
|
|
|
1405 {
|
|
|
1406 /* This function is pretty 32bit-centric. */
|
|
|
1407 unsigned long hash = internal_hash (object, 0);
|
|
|
1408 return Fcons (hash >> 16, hash & 0xffff);
|
|
|
1409 }
|
|
|
1410 #endif
|
|
|
1411
|
|
|
1412
|
|
|
1413 /************************************************************************/
|
|
|
1414 /* initialization */
|
|
|
1415 /************************************************************************/
|
|
|
1416
|
|
|
1417 void
|
|
|
1418 syms_of_elhash (void)
|
|
|
1419 {
|
|
|
1420 DEFSUBR (Fhash_table_p);
|
|
|
1421 DEFSUBR (Fmake_hash_table);
|
|
|
1422 DEFSUBR (Fcopy_hash_table);
|
|
|
1423 DEFSUBR (Fgethash);
|
|
|
1424 DEFSUBR (Fremhash);
|
|
|
1425 DEFSUBR (Fputhash);
|
|
|
1426 DEFSUBR (Fclrhash);
|
|
|
1427 DEFSUBR (Fmaphash);
|
|
|
1428 DEFSUBR (Fhash_table_count);
|
|
|
1429 DEFSUBR (Fhash_table_test);
|
|
|
1430 DEFSUBR (Fhash_table_size);
|
|
|
1431 DEFSUBR (Fhash_table_rehash_size);
|
|
|
1432 DEFSUBR (Fhash_table_rehash_threshold);
|
|
|
1433 DEFSUBR (Fhash_table_weakness);
|
|
|
1434 DEFSUBR (Fhash_table_type); /* obsolete */
|
|
|
1435 DEFSUBR (Fsxhash);
|
|
|
1436 #if 0
|
|
|
1437 DEFSUBR (Finternal_hash_value);
|
|
|
1438 #endif
|
|
|
1439
|
|
|
1440 defsymbol (&Qhash_tablep, "hash-table-p");
|
|
|
1441 defsymbol (&Qhash_table, "hash-table");
|
|
|
1442 defsymbol (&Qhashtable, "hashtable");
|
|
|
1443 defsymbol (&Qweakness, "weakness");
|
|
|
1444 defsymbol (&Qvalue, "value");
|
|
|
1445 defsymbol (&Qrehash_size, "rehash-size");
|
|
|
1446 defsymbol (&Qrehash_threshold, "rehash-threshold");
|
|
|
1447
|
|
|
1448 defsymbol (&Qweak, "weak"); /* obsolete */
|
|
|
1449 defsymbol (&Qkey_weak, "key-weak"); /* obsolete */
|
|
|
1450 defsymbol (&Qvalue_weak, "value-weak"); /* obsolete */
|
|
|
1451 defsymbol (&Qnon_weak, "non-weak"); /* obsolete */
|
|
|
1452
|
|
|
1453 defkeyword (&Q_test, ":test");
|
|
|
1454 defkeyword (&Q_size, ":size");
|
|
|
1455 defkeyword (&Q_rehash_size, ":rehash-size");
|
|
|
1456 defkeyword (&Q_rehash_threshold, ":rehash-threshold");
|
|
|
1457 defkeyword (&Q_weakness, ":weakness");
|
|
|
1458 defkeyword (&Q_type, ":type"); /* obsolete */
|
|
|
1459 }
|
|
|
1460
|
|
|
1461 void
|
|
|
1462 vars_of_elhash (void)
|
|
|
1463 {
|
|
|
1464 /* This must NOT be staticpro'd */
|
|
|
1465 Vall_weak_hash_tables = Qnil;
|
|
|
1466 pdump_wire_list (&Vall_weak_hash_tables);
|
|
|
1467 }
|
