libguile/weaks.c

   1 /*      Copyright (C) 1995,1996 Free Software Foundation, Inc.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2, or (at your option)
   6  * any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this software; see the file COPYING.  If not, write to
  15  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  16  *
  17  * As a special exception, Free Software Foundation gives permission
  18  * for additional uses of the text contained in its release of this library.
  19  *
  20  * The exception is that, if you link this library with other files
  21  * to produce an executable, this does not by itself cause the
  22  * resulting executable to be covered by the GNU General Public License.
  23  * Your use of that executable is in no way restricted on account of
  24  * linking this library code into it.
  25  *
  26  * This exception does not however invalidate any other reasons why
  27  * the executable file might be covered by the GNU General Public License.
  28  *
  29  * This exception applies only to the code released by
  30  * Free Software Foundation as part of this library.  If you copy
  31  * code from other releases distributed under the terms of the GPL into a copy of
  32  * this library, as the General Public License permits, the exception does
  33  * not apply to the code that you add in this way.  To avoid misleading
  34  * anyone as to the status of such modified files, you must delete
  35  * this exception notice from such code.
  36  *
  37  * If you write modifications of your own for this library, it is your choice
  38  * whether to permit this exception to apply to your modifications.
  39  * If you do not wish that, delete this exception notice.
  40  */
  41 \f
  42 #include <stdio.h>
  43 #include "_scm.h"
  44
  45 #include "weaks.h"
  46 \f
  47
  48
  49 /* {Weak Vectors}
  50  */
  51
  52
  53 SCM_PROC(s_make_weak_vector, "make-weak-vector", 1, 1, 0, scm_make_weak_vector);
  54
  55 SCM
  56 scm_make_weak_vector (k, fill)
  57      SCM k;
  58      SCM fill;
  59 {
  60   SCM v;
  61   v = scm_make_vector (scm_sum (k, SCM_MAKINUM (1)), fill, SCM_UNDEFINED);
  62   SCM_DEFER_INTS;
  63   SCM_SETLENGTH(v, SCM_INUM (k), scm_tc7_wvect);
  64   SCM_VELTS(v)[0] = (SCM)0;
  65   SCM_SETVELTS(v, SCM_VELTS(v) + 1);
  66   SCM_ALLOW_INTS;
  67   return v;
  68 }
  69
  70
  71 SCM_PROC(s_weak_vector, "weak-vector", 0, 0, 1, scm_weak_vector);
  72 SCM_PROC(s_list_to_weak_vector, "list->weak-vector", 1, 0, 0, scm_weak_vector);
  73
  74 SCM
  75 scm_weak_vector (l)
  76      SCM l;
  77 {
  78   SCM res;
  79   register SCM *data;
  80   long i;
  81
  82   i = scm_ilength (l);
  83   SCM_ASSERT (i >= 0, l, SCM_ARG1, s_weak_vector);
  84   res = scm_make_weak_vector (SCM_MAKINUM (i), SCM_UNSPECIFIED);
  85   data = SCM_VELTS (res);
  86   for (;
  87        i && SCM_NIMP (l) && SCM_CONSP (l);
  88        --i, l = SCM_CDR (l))
  89     *data++ = SCM_CAR (l);
  90   return res;
  91 }
  92
  93
  94 SCM_PROC(s_weak_vector_p, "weak-vector?", 1, 0, 0, scm_weak_vector_p);
  95
  96 SCM
  97 scm_weak_vector_p (x)
  98      SCM x;
  99 {
 100   return ((SCM_NIMP (x) && SCM_WVECTP (x) && !SCM_IS_WHVEC (x))
 101           ? SCM_BOOL_T
 102           : SCM_BOOL_F);
 103 }
 104
 105
 106
 107 \f
 108
 109
 110
 111 SCM_PROC(s_make_weak_key_hash_table, "make-weak-key-hash-table", 1, 0, 0, scm_make_weak_key_hash_table);
 112
 113 SCM
 114 scm_make_weak_key_hash_table (k)
 115      SCM k;
 116 {
 117   SCM v;
 118   SCM_ASSERT (SCM_INUMP (k), k, SCM_ARG1, s_make_weak_key_hash_table);
 119   v = scm_make_weak_vector (k, SCM_EOL);
 120   SCM_ALLOW_INTS;
 121   SCM_VELTS (v)[-1] = 1;
 122   SCM_ALLOW_INTS;
 123   return v;
 124 }
 125
 126
 127 SCM_PROC (s_make_weak_value_hash_table, "make-weak-value-hash-table", 1, 0, 0, scm_make_weak_value_hash_table);
 128
 129 SCM
 130 scm_make_weak_value_hash_table (k)
 131      SCM k;
 132 {
 133   SCM v;
 134   SCM_ASSERT (SCM_INUMP (k), k, SCM_ARG1, s_make_weak_value_hash_table);
 135   v = scm_make_weak_vector (k, SCM_EOL);
 136   SCM_ALLOW_INTS;
 137   SCM_VELTS (v)[-1] = 2;
 138   SCM_ALLOW_INTS;
 139   return v;
 140 }
 141
 142
 143
 144 SCM_PROC (s_make_doubly_weak_hash_table, "make-doubly-weak-hash-table", 1, 0, 0, scm_make_doubly_weak_hash_table);
 145
 146 SCM
 147 scm_make_doubly_weak_hash_table (k)
 148      SCM k;
 149 {
 150   SCM v;
 151   SCM_ASSERT (SCM_INUMP (k), k, SCM_ARG1, s_make_doubly_weak_hash_table);
 152   v = scm_make_weak_vector (k, SCM_EOL);
 153   SCM_ALLOW_INTS;
 154   SCM_VELTS (v)[-1] = 3;
 155   SCM_ALLOW_INTS;
 156   return v;
 157 }
 158
 159 SCM_PROC(s_weak_key_hash_table_p, "weak-key-hash-table?", 1, 0, 0, scm_weak_key_hash_table_p);
 160
 161 SCM
 162 scm_weak_key_hash_table_p (x)
 163      SCM x;
 164 {
 165   return ((SCM_NIMP (x) && SCM_WVECTP (x) && SCM_IS_WHVEC(x))
 166           ? SCM_BOOL_T
 167           : SCM_BOOL_F);
 168 }
 169
 170
 171 SCM_PROC (s_weak_value_hash_table_p, "weak-value-hash-table?", 1, 0, 0, scm_weak_value_hash_table_p);
 172
 173 SCM
 174 scm_weak_value_hash_table_p (x)
 175      SCM x;
 176 {
 177   return ((SCM_NIMP (x) && SCM_WVECTP (x) && SCM_IS_WHVEC_V(x))
 178           ? SCM_BOOL_T
 179           : SCM_BOOL_F);
 180 }
 181
 182
 183 SCM_PROC (s_doubly_weak_hash_table_p, "doubly-weak-hash-table?", 1, 0, 0, scm_doubly_weak_hash_table_p);
 184
 185 SCM
 186 scm_doubly_weak_hash_table_p (x)
 187      SCM x;
 188 {
 189   return ((SCM_NIMP (x) && SCM_WVECTP (x) && SCM_IS_WHVEC_B (x))
 190           ? SCM_BOOL_T
 191           : SCM_BOOL_F);
 192 }
 193
 194
 195 \f
 196
 197
 198 void
 199 scm_init_weaks ()
 200 {
 201 #include "weaks.x"
 202 }
 203