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0
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1 /* Lisp interface to hash tables.
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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
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 #include <config.h>
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25 #include "lisp.h"
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26 #include "hash.h"
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27 #include "elhash.h"
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28 #include "bytecode.h"
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29
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30 Lisp_Object Qhashtablep;
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31
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32 #define LISP_OBJECTS_PER_HENTRY (sizeof (hentry) / sizeof (Lisp_Object))/* 2 */
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33
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185
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34 struct hashtable
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0
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35 {
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36 struct lcrecord_header header;
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37 unsigned int fullness;
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38 unsigned long (*hash_function) (CONST void *);
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39 int (*test_function) (CONST void *, CONST void *);
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40 Lisp_Object zero_entry;
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41 Lisp_Object harray;
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42 enum hashtable_type type; /* whether and how this hashtable is weak */
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43 Lisp_Object next_weak; /* Used to chain together all of the weak
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44 hashtables. Don't mark through this. */
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45 };
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46
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47 static Lisp_Object Vall_weak_hashtables;
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48
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49 static Lisp_Object mark_hashtable (Lisp_Object, void (*) (Lisp_Object));
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50 static void print_hashtable (Lisp_Object, Lisp_Object, int);
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51 DEFINE_LRECORD_IMPLEMENTATION ("hashtable", hashtable,
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52 mark_hashtable, print_hashtable, 0, 0, 0,
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185
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53 struct hashtable);
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0
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54
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55 static Lisp_Object
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56 mark_hashtable (Lisp_Object obj, void (*markobj) (Lisp_Object))
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57 {
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185
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58 struct hashtable *table = XHASHTABLE (obj);
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0
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59
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60 if (table->type != HASHTABLE_NONWEAK)
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61 {
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62 /* If the table is weak, we don't want to mark the keys and values
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63 (we scan over them after everything else has been marked,
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64 and mark or remove them as necessary). Note that we will mark
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65 the table->harray itself at the same time; it's hard to mark
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66 that here without also marking its contents. */
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67 return Qnil;
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68 }
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69 ((markobj) (table->zero_entry));
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173
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70 return table->harray;
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0
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71 }
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185
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72
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0
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73 static void
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74 print_hashtable (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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75 {
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185
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76 struct hashtable *table = XHASHTABLE (obj);
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0
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77 char buf[200];
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78 if (print_readably)
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79 error ("printing unreadable object #<hashtable 0x%x>",
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80 table->header.uid);
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81 sprintf (buf, GETTEXT ("#<%shashtable %d/%ld 0x%x>"),
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82 (table->type == HASHTABLE_WEAK ? "weak " :
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83 table->type == HASHTABLE_KEY_WEAK ? "key-weak " :
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84 table->type == HASHTABLE_VALUE_WEAK ? "value-weak " :
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85 table->type == HASHTABLE_KEY_CAR_WEAK ? "key-car-weak " :
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86 table->type == HASHTABLE_VALUE_CAR_WEAK ? "value-car-weak " :
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87 ""),
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88 table->fullness,
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173
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89 XVECTOR_LENGTH (table->harray) / LISP_OBJECTS_PER_HENTRY,
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0
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90 table->header.uid);
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91 write_c_string (buf, printcharfun);
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92 }
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93
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94 static void
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185
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95 ht_copy_to_c (struct hashtable *ht, c_hashtable c_table)
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0
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96 {
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173
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97 int len = XVECTOR_LENGTH (ht->harray);
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0
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98
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185
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99 c_table->harray = (hentry *) XVECTOR_DATA (ht->harray);
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0
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100 c_table->zero_set = (!GC_UNBOUNDP (ht->zero_entry));
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101 c_table->zero_entry = LISP_TO_VOID (ht->zero_entry);
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207
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102 #ifndef LRECORD_VECTOR
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0
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103 if (len < 0)
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104 {
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105 /* #### if alloc.c mark_object() changes, this must change too. */
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106 /* barf gag retch. When a vector is marked, its len is
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107 made less than 0. In the prune_weak_hashtables() stage,
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108 we are called on vectors that are like this, and we must
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109 be able to deal. */
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110 assert (gc_in_progress);
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111 len = -1 - len;
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112 }
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207
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113 #endif
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173
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114 c_table->size = len/LISP_OBJECTS_PER_HENTRY;
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115 c_table->fullness = ht->fullness;
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0
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116 c_table->hash_function = ht->hash_function;
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117 c_table->test_function = ht->test_function;
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118 XSETHASHTABLE (c_table->elisp_table, ht);
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119 }
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120
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121 static void
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185
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122 ht_copy_from_c (c_hashtable c_table, struct hashtable *ht)
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0
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123 {
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124 struct Lisp_Vector dummy;
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125 /* C is truly hateful */
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126 void *vec_addr
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185
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127 = ((char *) c_table->harray
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173
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128 - ((char *) &(dummy.contents[0]) - (char *) &dummy));
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0
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129
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130 XSETVECTOR (ht->harray, vec_addr);
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131 if (c_table->zero_set)
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132 VOID_TO_LISP (ht->zero_entry, c_table->zero_entry);
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133 else
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134 ht->zero_entry = Qunbound;
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135 ht->fullness = c_table->fullness;
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136 }
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137
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138
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185
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139 static struct hashtable *
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0
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140 allocate_hashtable (void)
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141 {
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185
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142 struct hashtable *table =
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143 alloc_lcrecord_type (struct hashtable, lrecord_hashtable);
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173
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144 table->harray = Qnil;
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145 table->zero_entry = Qunbound;
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146 table->fullness = 0;
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0
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147 table->hash_function = 0;
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148 table->test_function = 0;
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173
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149 return table;
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0
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150 }
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151
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173
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152 void *
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0
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153 elisp_hvector_malloc (unsigned int bytes, Lisp_Object table)
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154 {
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155 Lisp_Object new_vector;
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185
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156 struct hashtable *ht = XHASHTABLE (table);
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0
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157
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173
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158 assert (bytes > XVECTOR_LENGTH (ht->harray) * sizeof (Lisp_Object));
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207
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159 new_vector = make_vector ((bytes / sizeof (Lisp_Object)), Qnull_pointer);
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173
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160 return (void *) XVECTOR_DATA (new_vector);
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0
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161 }
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162
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163 void
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164 elisp_hvector_free (void *ptr, Lisp_Object table)
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165 {
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185
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166 struct hashtable *ht = XHASHTABLE (table);
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0
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167 #if defined (USE_ASSERTIONS) || defined (DEBUG_XEMACS)
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168 Lisp_Object current_vector = ht->harray;
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169 #endif
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170
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173
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171 assert (((void *) XVECTOR_DATA (current_vector)) == ptr);
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0
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172 ht->harray = Qnil; /* Let GC do its job */
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173 }
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174
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175
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20
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176 DEFUN ("hashtablep", Fhashtablep, 1, 1, 0, /*
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0
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177 Return t if OBJ is a hashtable, else nil.
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20
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178 */
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179 (obj))
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0
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180 {
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173
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181 return HASHTABLEP (obj) ? Qt : Qnil;
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0
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182 }
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183
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184
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185
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186
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187 #if 0 /* I don't think these are needed any more.
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188 If using the general lisp_object_equal_*() functions
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189 causes efficiency problems, these can be resurrected. --ben */
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190 /* equality and hash functions for Lisp strings */
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191 int
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192 lisp_string_equal (CONST void *x1, CONST void *x2)
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193 {
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194 Lisp_Object str1, str2;
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195 CVOID_TO_LISP (str1, x1);
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196 CVOID_TO_LISP (str2, x2);
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14
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197 return !strcmp ((char *) XSTRING_DATA (str1), (char *) XSTRING_DATA (str2));
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0
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198 }
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199
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200 unsigned long
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201 lisp_string_hash (CONST void *x)
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202 {
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203 Lisp_Object str;
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204 CVOID_TO_LISP (str, x);
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14
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205 return hash_string (XSTRING_DATA (str), XSTRING_LENGTH (str));
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0
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206 }
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207
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208 #endif /* 0 */
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209
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210 static int
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211 lisp_object_eql_equal (CONST void *x1, CONST void *x2)
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212 {
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213 Lisp_Object obj1, obj2;
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214 CVOID_TO_LISP (obj1, x1);
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215 CVOID_TO_LISP (obj2, x2);
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195
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216 return FLOATP (obj1) ? internal_equal (obj1, obj2, 0) : EQ (obj1, obj2);
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0
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217 }
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218
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219 static unsigned long
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220 lisp_object_eql_hash (CONST void *x)
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221 {
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222 Lisp_Object obj;
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223 CVOID_TO_LISP (obj, x);
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224 if (FLOATP (obj))
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225 return internal_hash (obj, 0);
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226 else
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227 return LISP_HASH (obj);
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228 }
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229
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230 static int
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231 lisp_object_equal_equal (CONST void *x1, CONST void *x2)
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232 {
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233 Lisp_Object obj1, obj2;
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234 CVOID_TO_LISP (obj1, x1);
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235 CVOID_TO_LISP (obj2, x2);
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195
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236 return internal_equal (obj1, obj2, 0);
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0
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237 }
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238
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239 static unsigned long
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240 lisp_object_equal_hash (CONST void *x)
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241 {
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242 Lisp_Object obj;
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243 CVOID_TO_LISP (obj, x);
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244 return internal_hash (obj, 0);
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245 }
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246
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247 Lisp_Object
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248 make_lisp_hashtable (int size,
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249 enum hashtable_type type,
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250 enum hashtable_test_fun test)
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251 {
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252 Lisp_Object result;
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185
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253 struct hashtable *table = allocate_hashtable ();
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0
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254
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255 table->harray = make_vector ((compute_harray_size (size)
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256 * LISP_OBJECTS_PER_HENTRY),
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207
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257 Qnull_pointer);
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0
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258 switch (test)
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259 {
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260 case HASHTABLE_EQ:
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187
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261 table->test_function = NULL;
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262 table->hash_function = NULL;
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0
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263 break;
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264
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265 case HASHTABLE_EQL:
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266 table->test_function = lisp_object_eql_equal;
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267 table->hash_function = lisp_object_eql_hash;
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268 break;
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269
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270 case HASHTABLE_EQUAL:
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271 table->test_function = lisp_object_equal_equal;
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272 table->hash_function = lisp_object_equal_hash;
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273 break;
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274
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275 default:
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276 abort ();
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277 }
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278
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279 table->type = type;
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280 XSETHASHTABLE (result, table);
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281
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282 if (table->type != HASHTABLE_NONWEAK)
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283 {
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284 table->next_weak = Vall_weak_hashtables;
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285 Vall_weak_hashtables = result;
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286 }
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287 else
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288 table->next_weak = Qunbound;
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289
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173
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290 return result;
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0
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291 }
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292
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293 static enum hashtable_test_fun
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294 decode_hashtable_test_fun (Lisp_Object sym)
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295 {
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187
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296 if (NILP (sym)) return HASHTABLE_EQL;
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2
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297 if (EQ (sym, Qeq)) return HASHTABLE_EQ;
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298 if (EQ (sym, Qequal)) return HASHTABLE_EQUAL;
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299 if (EQ (sym, Qeql)) return HASHTABLE_EQL;
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185
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300
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0
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301 signal_simple_error ("Invalid hashtable test fun", sym);
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2
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302 return HASHTABLE_EQ; /* not reached */
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0
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303 }
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304
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20
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305 DEFUN ("make-hashtable", Fmake_hashtable, 1, 2, 0, /*
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0
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306 Make a hashtable of initial size SIZE.
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307 Comparison between keys is done with TEST-FUN, which must be one of
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308 `eq', `eql', or `equal'. The default is `eql'; i.e. two keys must
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309 be the same object (or have the same floating-point value, for floats)
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310 to be considered equivalent.
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311
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312 See also `make-weak-hashtable', `make-key-weak-hashtable', and
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313 `make-value-weak-hashtable'.
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20
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314 */
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315 (size, test_fun))
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0
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316 {
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317 CHECK_NATNUM (size);
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318 return make_lisp_hashtable (XINT (size), HASHTABLE_NONWEAK,
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319 decode_hashtable_test_fun (test_fun));
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320 }
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321
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20
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322 DEFUN ("copy-hashtable", Fcopy_hashtable, 1, 1, 0, /*
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0
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323 Make a new hashtable which contains the same keys and values
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324 as the given table. The keys and values will not themselves be copied.
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20
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325 */
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326 (old_table))
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0
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327 {
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328 struct _C_hashtable old_htbl;
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329 struct _C_hashtable new_htbl;
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185
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330 struct hashtable *old_ht;
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331 struct hashtable *new_ht;
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0
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332 Lisp_Object result;
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333
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334 CHECK_HASHTABLE (old_table);
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335 old_ht = XHASHTABLE (old_table);
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336 ht_copy_to_c (old_ht, &old_htbl);
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337
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338 /* we can't just call Fmake_hashtable() here because that will make a
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339 table that is slightly larger than the one we're trying to copy,
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340 which will make copy_hash() blow up. */
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341 new_ht = allocate_hashtable ();
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342 new_ht->fullness = 0;
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343 new_ht->zero_entry = Qunbound;
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344 new_ht->hash_function = old_ht->hash_function;
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345 new_ht->test_function = old_ht->test_function;
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207
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346 new_ht->harray = Fmake_vector (Flength (old_ht->harray), Qnull_pointer);
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0
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347 ht_copy_to_c (new_ht, &new_htbl);
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348 copy_hash (&new_htbl, &old_htbl);
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349 ht_copy_from_c (&new_htbl, new_ht);
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350 new_ht->type = old_ht->type;
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351 XSETHASHTABLE (result, new_ht);
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352
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353 if (UNBOUNDP (old_ht->next_weak))
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354 new_ht->next_weak = Qunbound;
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355 else
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356 {
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357 new_ht->next_weak = Vall_weak_hashtables;
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358 Vall_weak_hashtables = result;
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359 }
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360
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173
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361 return result;
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0
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362 }
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363
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364
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20
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365 DEFUN ("gethash", Fgethash, 2, 3, 0, /*
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|
187
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366 Find hash value for KEY in HASHTABLE.
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|
0
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367 If there is no corresponding value, return DEFAULT (defaults to nil).
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20
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368 */
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187
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369 (key, hashtable, default_))
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0
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370 {
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371 CONST void *vval;
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372 struct _C_hashtable htbl;
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|
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373 if (!gc_in_progress)
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187
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374 CHECK_HASHTABLE (hashtable);
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375 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
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0
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376 if (gethash (LISP_TO_VOID (key), &htbl, &vval))
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|
|
377 {
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|
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378 Lisp_Object val;
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|
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379 CVOID_TO_LISP (val, vval);
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380 return val;
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381 }
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185
|
382 else
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173
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383 return default_;
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|
0
|
384 }
|
|
|
385
|
|
|
386
|
|
20
|
387 DEFUN ("remhash", Fremhash, 2, 2, 0, /*
|
|
187
|
388 Remove hash value for KEY in HASHTABLE.
|
|
20
|
389 */
|
|
187
|
390 (key, hashtable))
|
|
0
|
391 {
|
|
|
392 struct _C_hashtable htbl;
|
|
187
|
393 CHECK_HASHTABLE (hashtable);
|
|
0
|
394
|
|
187
|
395 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
|
|
0
|
396 remhash (LISP_TO_VOID (key), &htbl);
|
|
187
|
397 ht_copy_from_c (&htbl, XHASHTABLE (hashtable));
|
|
0
|
398 return Qnil;
|
|
|
399 }
|
|
|
400
|
|
|
401
|
|
20
|
402 DEFUN ("puthash", Fputhash, 3, 3, 0, /*
|
|
187
|
403 Hash KEY to VAL in HASHTABLE.
|
|
20
|
404 */
|
|
187
|
405 (key, val, hashtable))
|
|
0
|
406 {
|
|
185
|
407 struct hashtable *ht;
|
|
0
|
408 void *vkey = LISP_TO_VOID (key);
|
|
|
409
|
|
187
|
410 CHECK_HASHTABLE (hashtable);
|
|
|
411 ht = XHASHTABLE (hashtable);
|
|
0
|
412 if (!vkey)
|
|
|
413 ht->zero_entry = val;
|
|
|
414 else
|
|
|
415 {
|
|
|
416 struct gcpro gcpro1, gcpro2, gcpro3;
|
|
|
417 struct _C_hashtable htbl;
|
|
|
418
|
|
187
|
419 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
|
|
|
420 GCPRO3 (key, val, hashtable);
|
|
0
|
421 puthash (vkey, LISP_TO_VOID (val), &htbl);
|
|
187
|
422 ht_copy_from_c (&htbl, XHASHTABLE (hashtable));
|
|
0
|
423 UNGCPRO;
|
|
|
424 }
|
|
173
|
425 return val;
|
|
0
|
426 }
|
|
|
427
|
|
20
|
428 DEFUN ("clrhash", Fclrhash, 1, 1, 0, /*
|
|
187
|
429 Remove all entries from HASHTABLE.
|
|
20
|
430 */
|
|
187
|
431 (hashtable))
|
|
0
|
432 {
|
|
|
433 struct _C_hashtable htbl;
|
|
187
|
434 CHECK_HASHTABLE (hashtable);
|
|
|
435 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
|
|
0
|
436 clrhash (&htbl);
|
|
187
|
437 ht_copy_from_c (&htbl, XHASHTABLE (hashtable));
|
|
0
|
438 return Qnil;
|
|
|
439 }
|
|
|
440
|
|
20
|
441 DEFUN ("hashtable-fullness", Fhashtable_fullness, 1, 1, 0, /*
|
|
187
|
442 Return number of entries in HASHTABLE.
|
|
20
|
443 */
|
|
187
|
444 (hashtable))
|
|
0
|
445 {
|
|
|
446 struct _C_hashtable htbl;
|
|
187
|
447 CHECK_HASHTABLE (hashtable);
|
|
|
448 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
|
|
173
|
449 return make_int (htbl.fullness);
|
|
0
|
450 }
|
|
|
451
|
|
|
452
|
|
|
453 static void
|
|
|
454 verify_function (Lisp_Object function, CONST char *description)
|
|
|
455 {
|
|
|
456 if (SYMBOLP (function))
|
|
|
457 {
|
|
|
458 if (NILP (function))
|
|
|
459 return;
|
|
|
460 else
|
|
|
461 function = indirect_function (function, 1);
|
|
|
462 }
|
|
|
463 if (SUBRP (function) || COMPILED_FUNCTIONP (function))
|
|
|
464 return;
|
|
|
465 else if (CONSP (function))
|
|
|
466 {
|
|
|
467 Lisp_Object funcar = Fcar (function);
|
|
187
|
468 if ((SYMBOLP (funcar)) && (EQ (funcar, Qlambda) ||
|
|
|
469 EQ (funcar, Qautoload)))
|
|
0
|
470 return;
|
|
|
471 }
|
|
|
472 signal_error (Qinvalid_function, list1 (function));
|
|
|
473 }
|
|
|
474
|
|
|
475 static void
|
|
|
476 lisp_maphash_function (CONST void *void_key,
|
|
|
477 void *void_val,
|
|
|
478 void *void_fn)
|
|
|
479 {
|
|
|
480 /* This function can GC */
|
|
|
481 Lisp_Object key, val, fn;
|
|
|
482 CVOID_TO_LISP (key, void_key);
|
|
|
483 VOID_TO_LISP (val, void_val);
|
|
|
484 VOID_TO_LISP (fn, void_fn);
|
|
|
485 call2 (fn, key, val);
|
|
|
486 }
|
|
|
487
|
|
|
488
|
|
20
|
489 DEFUN ("maphash", Fmaphash, 2, 2, 0, /*
|
|
187
|
490 Map FUNCTION over entries in HASHTABLE, calling it with two args,
|
|
0
|
491 each key and value in the table.
|
|
20
|
492 */
|
|
187
|
493 (function, hashtable))
|
|
0
|
494 {
|
|
|
495 struct _C_hashtable htbl;
|
|
|
496 struct gcpro gcpro1, gcpro2;
|
|
|
497
|
|
|
498 verify_function (function, GETTEXT ("hashtable mapping function"));
|
|
187
|
499 CHECK_HASHTABLE (hashtable);
|
|
|
500 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
|
|
|
501 GCPRO2 (hashtable, function);
|
|
0
|
502 maphash (lisp_maphash_function, &htbl, LISP_TO_VOID (function));
|
|
|
503 UNGCPRO;
|
|
|
504 return Qnil;
|
|
|
505 }
|
|
|
506
|
|
|
507
|
|
|
508 /* This function is for mapping a *C* function over the elements of a
|
|
|
509 lisp hashtable.
|
|
|
510 */
|
|
|
511 void
|
|
187
|
512 elisp_maphash (maphash_function function, Lisp_Object hashtable, void *closure)
|
|
0
|
513 {
|
|
|
514 struct _C_hashtable htbl;
|
|
|
515
|
|
187
|
516 if (!gc_in_progress) CHECK_HASHTABLE (hashtable);
|
|
|
517 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
|
|
0
|
518 maphash (function, &htbl, closure);
|
|
|
519 }
|
|
|
520
|
|
|
521 void
|
|
187
|
522 elisp_map_remhash (remhash_predicate function, Lisp_Object hashtable,
|
|
|
523 void *closure)
|
|
0
|
524 {
|
|
|
525 struct _C_hashtable htbl;
|
|
|
526
|
|
187
|
527 if (!gc_in_progress) CHECK_HASHTABLE (hashtable);
|
|
|
528 ht_copy_to_c (XHASHTABLE (hashtable), &htbl);
|
|
0
|
529 map_remhash (function, &htbl, closure);
|
|
187
|
530 ht_copy_from_c (&htbl, XHASHTABLE (hashtable));
|
|
0
|
531 }
|
|
|
532
|
|
|
533 #if 0
|
|
|
534 void
|
|
|
535 elisp_table_op (Lisp_Object table, generic_hashtable_op op, void *arg1,
|
|
|
536 void *arg2, void *arg3)
|
|
|
537 {
|
|
|
538 struct _C_hashtable htbl;
|
|
|
539 CHECK_HASHTABLE (table);
|
|
|
540 ht_copy_to_c (XHASHTABLE (table), &htbl);
|
|
|
541 (*op) (&htbl, arg1, arg2, arg3);
|
|
|
542 ht_copy_from_c (&htbl, XHASHTABLE (table));
|
|
|
543 }
|
|
|
544 #endif /* 0 */
|
|
|
545
|
|
|
546
|
|
|
547
|
|
20
|
548 DEFUN ("make-weak-hashtable", Fmake_weak_hashtable, 1, 2, 0, /*
|
|
0
|
549 Make a fully weak hashtable of initial size SIZE.
|
|
|
550 A weak hashtable is one whose pointers do not count as GC referents:
|
|
|
551 for any key-value pair in the hashtable, if the only remaining pointer
|
|
|
552 to either the key or the value is in a weak hash table, then the pair
|
|
|
553 will be removed from the table, and the key and value collected. A
|
|
|
554 non-weak hash table (or any other pointer) would prevent the object
|
|
|
555 from being collected.
|
|
|
556
|
|
|
557 You can also create semi-weak hashtables; see `make-key-weak-hashtable'
|
|
|
558 and `make-value-weak-hashtable'.
|
|
20
|
559 */
|
|
|
560 (size, test_fun))
|
|
0
|
561 {
|
|
|
562 CHECK_NATNUM (size);
|
|
|
563 return make_lisp_hashtable (XINT (size), HASHTABLE_WEAK,
|
|
|
564 decode_hashtable_test_fun (test_fun));
|
|
|
565 }
|
|
|
566
|
|
20
|
567 DEFUN ("make-key-weak-hashtable", Fmake_key_weak_hashtable, 1, 2, 0, /*
|
|
0
|
568 Make a key-weak hashtable of initial size SIZE.
|
|
|
569 A key-weak hashtable is similar to a fully-weak hashtable (see
|
|
|
570 `make-weak-hashtable') except that a key-value pair will be removed
|
|
|
571 only if the key remains unmarked outside of weak hashtables. The pair
|
|
|
572 will remain in the hashtable if the key is pointed to by something other
|
|
|
573 than a weak hashtable, even if the value is not.
|
|
20
|
574 */
|
|
|
575 (size, test_fun))
|
|
0
|
576 {
|
|
|
577 CHECK_NATNUM (size);
|
|
|
578 return make_lisp_hashtable (XINT (size), HASHTABLE_KEY_WEAK,
|
|
|
579 decode_hashtable_test_fun (test_fun));
|
|
|
580 }
|
|
|
581
|
|
20
|
582 DEFUN ("make-value-weak-hashtable", Fmake_value_weak_hashtable, 1, 2, 0, /*
|
|
0
|
583 Make a value-weak hashtable of initial size SIZE.
|
|
|
584 A value-weak hashtable is similar to a fully-weak hashtable (see
|
|
|
585 `make-weak-hashtable') except that a key-value pair will be removed only
|
|
|
586 if the value remains unmarked outside of weak hashtables. The pair will
|
|
|
587 remain in the hashtable if the value is pointed to by something other
|
|
|
588 than a weak hashtable, even if the key is not.
|
|
20
|
589 */
|
|
|
590 (size, test_fun))
|
|
0
|
591 {
|
|
|
592 CHECK_NATNUM (size);
|
|
|
593 return make_lisp_hashtable (XINT (size), HASHTABLE_VALUE_WEAK,
|
|
|
594 decode_hashtable_test_fun (test_fun));
|
|
|
595 }
|
|
|
596
|
|
|
597 struct marking_closure
|
|
|
598 {
|
|
|
599 int (*obj_marked_p) (Lisp_Object);
|
|
|
600 void (*markobj) (Lisp_Object);
|
|
|
601 enum hashtable_type type;
|
|
|
602 int did_mark;
|
|
|
603 };
|
|
|
604
|
|
|
605 static void
|
|
|
606 marking_mapper (CONST void *key, void *contents, void *closure)
|
|
|
607 {
|
|
|
608 Lisp_Object keytem, valuetem;
|
|
|
609 struct marking_closure *fmh =
|
|
|
610 (struct marking_closure *) closure;
|
|
|
611
|
|
|
612 /* This function is called over each pair in the hashtable.
|
|
|
613 We complete the marking for semi-weak hashtables. */
|
|
|
614 CVOID_TO_LISP (keytem, key);
|
|
|
615 CVOID_TO_LISP (valuetem, contents);
|
|
185
|
616
|
|
0
|
617 switch (fmh->type)
|
|
|
618 {
|
|
|
619 case HASHTABLE_KEY_WEAK:
|
|
|
620 if ((fmh->obj_marked_p) (keytem) &&
|
|
|
621 !(fmh->obj_marked_p) (valuetem))
|
|
|
622 {
|
|
|
623 (fmh->markobj) (valuetem);
|
|
|
624 fmh->did_mark = 1;
|
|
|
625 }
|
|
|
626 break;
|
|
|
627
|
|
|
628 case HASHTABLE_VALUE_WEAK:
|
|
|
629 if ((fmh->obj_marked_p) (valuetem) &&
|
|
|
630 !(fmh->obj_marked_p) (keytem))
|
|
|
631 {
|
|
|
632 (fmh->markobj) (keytem);
|
|
|
633 fmh->did_mark = 1;
|
|
|
634 }
|
|
|
635 break;
|
|
|
636
|
|
|
637 case HASHTABLE_KEY_CAR_WEAK:
|
|
|
638 if (!CONSP (keytem) || (fmh->obj_marked_p) (XCAR (keytem)))
|
|
|
639 {
|
|
|
640 if (!(fmh->obj_marked_p) (keytem))
|
|
|
641 {
|
|
|
642 (fmh->markobj) (keytem);
|
|
|
643 fmh->did_mark = 1;
|
|
|
644 }
|
|
|
645 if (!(fmh->obj_marked_p) (valuetem))
|
|
|
646 {
|
|
|
647 (fmh->markobj) (valuetem);
|
|
|
648 fmh->did_mark = 1;
|
|
|
649 }
|
|
|
650 }
|
|
|
651 break;
|
|
|
652
|
|
|
653 case HASHTABLE_VALUE_CAR_WEAK:
|
|
|
654 if (!CONSP (valuetem) || (fmh->obj_marked_p) (XCAR (valuetem)))
|
|
|
655 {
|
|
|
656 if (!(fmh->obj_marked_p) (keytem))
|
|
|
657 {
|
|
|
658 (fmh->markobj) (keytem);
|
|
|
659 fmh->did_mark = 1;
|
|
|
660 }
|
|
|
661 if (!(fmh->obj_marked_p) (valuetem))
|
|
|
662 {
|
|
|
663 (fmh->markobj) (valuetem);
|
|
|
664 fmh->did_mark = 1;
|
|
|
665 }
|
|
|
666 }
|
|
|
667 break;
|
|
|
668
|
|
|
669 default:
|
|
|
670 abort (); /* Huh? */
|
|
|
671 }
|
|
185
|
672
|
|
0
|
673 return;
|
|
|
674 }
|
|
|
675
|
|
|
676 int
|
|
|
677 finish_marking_weak_hashtables (int (*obj_marked_p) (Lisp_Object),
|
|
|
678 void (*markobj) (Lisp_Object))
|
|
|
679 {
|
|
|
680 Lisp_Object rest;
|
|
|
681 int did_mark = 0;
|
|
|
682
|
|
|
683 for (rest = Vall_weak_hashtables;
|
|
|
684 !GC_NILP (rest);
|
|
|
685 rest = XHASHTABLE (rest)->next_weak)
|
|
|
686 {
|
|
|
687 enum hashtable_type type;
|
|
|
688
|
|
|
689 if (! ((*obj_marked_p) (rest)))
|
|
|
690 /* The hashtable is probably garbage. Ignore it. */
|
|
|
691 continue;
|
|
|
692 type = XHASHTABLE (rest)->type;
|
|
187
|
693 if (type == HASHTABLE_KEY_WEAK ||
|
|
|
694 type == HASHTABLE_VALUE_WEAK ||
|
|
|
695 type == HASHTABLE_KEY_CAR_WEAK ||
|
|
|
696 type == HASHTABLE_VALUE_CAR_WEAK)
|
|
0
|
697 {
|
|
|
698 struct marking_closure fmh;
|
|
|
699
|
|
|
700 fmh.obj_marked_p = obj_marked_p;
|
|
|
701 fmh.markobj = markobj;
|
|
|
702 fmh.type = type;
|
|
|
703 fmh.did_mark = 0;
|
|
|
704 /* Now, scan over all the pairs. For all pairs that are
|
|
|
705 half-marked, we may need to mark the other half if we're
|
|
|
706 keeping this pair. */
|
|
|
707 elisp_maphash (marking_mapper, rest, &fmh);
|
|
|
708 if (fmh.did_mark)
|
|
|
709 did_mark = 1;
|
|
|
710 }
|
|
|
711
|
|
|
712 /* #### If alloc.c mark_object changes, this must change also... */
|
|
|
713 {
|
|
|
714 /* Now mark the vector itself. (We don't need to call markobj
|
|
|
715 here because we know that everything *in* it is already marked,
|
|
|
716 we just need to prevent the vector itself from disappearing.)
|
|
|
717 (The remhash above has taken care of zero_entry.)
|
|
|
718 */
|
|
|
719 struct Lisp_Vector *ptr = XVECTOR (XHASHTABLE (rest)->harray);
|
|
|
720 int len = vector_length (ptr);
|
|
207
|
721 #ifdef LRECORD_VECTOR
|
|
|
722 if (! MARKED_RECORD_P(XHASHTABLE(rest)->harray))
|
|
|
723 {
|
|
|
724 MARK_RECORD_HEADER(&(ptr->header.lheader));
|
|
|
725 did_mark = 1;
|
|
|
726 }
|
|
|
727 #else
|
|
0
|
728 if (len >= 0)
|
|
|
729 {
|
|
|
730 ptr->size = -1 - len;
|
|
|
731 did_mark = 1;
|
|
|
732 }
|
|
207
|
733 #endif
|
|
0
|
734 /* else it's already marked (remember, this function is iterated
|
|
|
735 until marking stops) */
|
|
|
736 }
|
|
|
737 }
|
|
|
738
|
|
|
739 return did_mark;
|
|
|
740 }
|
|
|
741
|
|
|
742 struct pruning_closure
|
|
|
743 {
|
|
|
744 int (*obj_marked_p) (Lisp_Object);
|
|
|
745 };
|
|
|
746
|
|
|
747 static int
|
|
|
748 pruning_mapper (CONST void *key, CONST void *contents, void *closure)
|
|
|
749 {
|
|
|
750 Lisp_Object keytem, valuetem;
|
|
185
|
751 struct pruning_closure *fmh = (struct pruning_closure *) closure;
|
|
0
|
752
|
|
|
753 /* This function is called over each pair in the hashtable.
|
|
|
754 We remove the pairs that aren't completely marked (everything
|
|
|
755 that is going to stay ought to have been marked already
|
|
|
756 by the finish_marking stage). */
|
|
|
757 CVOID_TO_LISP (keytem, key);
|
|
|
758 CVOID_TO_LISP (valuetem, contents);
|
|
|
759
|
|
173
|
760 return ! ((*fmh->obj_marked_p) (keytem) &&
|
|
|
761 (*fmh->obj_marked_p) (valuetem));
|
|
0
|
762 }
|
|
|
763
|
|
|
764 void
|
|
|
765 prune_weak_hashtables (int (*obj_marked_p) (Lisp_Object))
|
|
|
766 {
|
|
|
767 Lisp_Object rest, prev = Qnil;
|
|
|
768 for (rest = Vall_weak_hashtables;
|
|
|
769 !GC_NILP (rest);
|
|
|
770 rest = XHASHTABLE (rest)->next_weak)
|
|
|
771 {
|
|
|
772 if (! ((*obj_marked_p) (rest)))
|
|
|
773 {
|
|
|
774 /* This table itself is garbage. Remove it from the list. */
|
|
|
775 if (GC_NILP (prev))
|
|
|
776 Vall_weak_hashtables = XHASHTABLE (rest)->next_weak;
|
|
|
777 else
|
|
|
778 XHASHTABLE (prev)->next_weak = XHASHTABLE (rest)->next_weak;
|
|
|
779 }
|
|
|
780 else
|
|
|
781 {
|
|
|
782 struct pruning_closure fmh;
|
|
|
783 fmh.obj_marked_p = obj_marked_p;
|
|
|
784 /* Now, scan over all the pairs. Remove all of the pairs
|
|
|
785 in which the key or value, or both, is unmarked
|
|
|
786 (depending on the type of weak hashtable). */
|
|
|
787 elisp_map_remhash (pruning_mapper, rest, &fmh);
|
|
|
788 prev = rest;
|
|
|
789 }
|
|
|
790 }
|
|
|
791 }
|
|
|
792
|
|
|
793 /* Return a hash value for an array of Lisp_Objects of size SIZE. */
|
|
|
794
|
|
|
795 unsigned long
|
|
|
796 internal_array_hash (Lisp_Object *arr, int size, int depth)
|
|
|
797 {
|
|
|
798 int i;
|
|
|
799 unsigned long hash = 0;
|
|
|
800
|
|
|
801 if (size <= 5)
|
|
|
802 {
|
|
|
803 for (i = 0; i < size; i++)
|
|
|
804 hash = HASH2 (hash, internal_hash (arr[i], depth + 1));
|
|
|
805 return hash;
|
|
|
806 }
|
|
185
|
807
|
|
0
|
808 /* just pick five elements scattered throughout the array.
|
|
|
809 A slightly better approach would be to offset by some
|
|
|
810 noise factor from the points chosen below. */
|
|
|
811 for (i = 0; i < 5; i++)
|
|
|
812 hash = HASH2 (hash, internal_hash (arr[i*size/5], depth + 1));
|
|
185
|
813
|
|
0
|
814 return hash;
|
|
|
815 }
|
|
|
816
|
|
|
817 /* Return a hash value for a Lisp_Object. This is for use when hashing
|
|
|
818 objects with the comparison being `equal' (for `eq', you can just
|
|
|
819 use the Lisp_Object itself as the hash value). You need to make a
|
|
|
820 tradeoff between the speed of the hash function and how good the
|
|
|
821 hashing is. In particular, the hash function needs to be FAST,
|
|
|
822 so you can't just traipse down the whole tree hashing everything
|
|
|
823 together. Most of the time, objects will differ in the first
|
|
|
824 few elements you hash. Thus, we only go to a short depth (5)
|
|
|
825 and only hash at most 5 elements out of a vector. Theoretically
|
|
|
826 we could still take 5^5 time (a big big number) to compute a
|
|
|
827 hash, but practically this won't ever happen. */
|
|
|
828
|
|
|
829 unsigned long
|
|
|
830 internal_hash (Lisp_Object obj, int depth)
|
|
|
831 {
|
|
|
832 if (depth > 5)
|
|
|
833 return 0;
|
|
|
834 if (CONSP (obj))
|
|
|
835 {
|
|
|
836 /* no point in worrying about tail recursion, since we're not
|
|
|
837 going very deep */
|
|
|
838 return HASH2 (internal_hash (XCAR (obj), depth + 1),
|
|
|
839 internal_hash (XCDR (obj), depth + 1));
|
|
|
840 }
|
|
|
841 else if (STRINGP (obj))
|
|
14
|
842 return hash_string (XSTRING_DATA (obj), XSTRING_LENGTH (obj));
|
|
0
|
843 else if (VECTORP (obj))
|
|
|
844 {
|
|
|
845 struct Lisp_Vector *v = XVECTOR (obj);
|
|
|
846 return HASH2 (vector_length (v),
|
|
|
847 internal_array_hash (v->contents, vector_length (v),
|
|
|
848 depth + 1));
|
|
|
849 }
|
|
|
850 else if (LRECORDP (obj))
|
|
|
851 {
|
|
|
852 CONST struct lrecord_implementation
|
|
211
|
853 *imp = XRECORD_LHEADER_IMPLEMENTATION (obj);
|
|
0
|
854 if (imp->hash)
|
|
173
|
855 return (imp->hash) (obj, depth);
|
|
0
|
856 }
|
|
|
857
|
|
|
858 return LISP_HASH (obj);
|
|
|
859 }
|
|
|
860
|
|
|
861
|
|
|
862 /************************************************************************/
|
|
|
863 /* initialization */
|
|
|
864 /************************************************************************/
|
|
|
865
|
|
|
866 void
|
|
|
867 syms_of_elhash (void)
|
|
|
868 {
|
|
20
|
869 DEFSUBR (Fmake_hashtable);
|
|
|
870 DEFSUBR (Fcopy_hashtable);
|
|
|
871 DEFSUBR (Fhashtablep);
|
|
|
872 DEFSUBR (Fgethash);
|
|
|
873 DEFSUBR (Fputhash);
|
|
|
874 DEFSUBR (Fremhash);
|
|
|
875 DEFSUBR (Fclrhash);
|
|
|
876 DEFSUBR (Fmaphash);
|
|
|
877 DEFSUBR (Fhashtable_fullness);
|
|
|
878 DEFSUBR (Fmake_weak_hashtable);
|
|
|
879 DEFSUBR (Fmake_key_weak_hashtable);
|
|
|
880 DEFSUBR (Fmake_value_weak_hashtable);
|
|
0
|
881 defsymbol (&Qhashtablep, "hashtablep");
|
|
|
882 }
|
|
|
883
|
|
|
884 void
|
|
|
885 vars_of_elhash (void)
|
|
|
886 {
|
|
2
|
887 /* This must NOT be staticpro'd */
|
|
0
|
888 Vall_weak_hashtables = Qnil;
|
|
|
889 }
|
