src/st-word-array.c

   1 /*
   2  * st-array.c
   3  *
   4  * Copyright (c) 2008 Vincent Geddes
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21  * THE SOFTWARE.
  22 */
  23
  24 #include "st-word-array.h"
  25 #include "st-universe.h"
  26 #include "st-utils.h"
  27 #include "st-descriptor.h"
  28
  29 static st_oop
  30 allocate_arrayed (st_space *space, st_oop class, st_smi size)
  31 {
  32     st_oop   array;
  33     st_smi   size_oops;
  34     st_uint *elements;
  35
  36     st_assert (size >= 0);
  37
  38     size_oops = size / (sizeof (st_oop) / sizeof (st_uint));
  39
  40     array = st_space_allocate_object (space, class, ST_SIZE_OOPS (struct st_word_array) + size_oops);
  41
  42     ST_ARRAYED_OBJECT (array)->size = st_smi_new (size);
  43     elements = st_word_array_elements (array);
  44     for (st_smi i = 0; i < size; i++)
  45         elements[i] = 0;
  46
  47     return array;
  48 }
  49
  50 static st_oop
  51 word_array_copy (st_oop object)
  52 {
  53     st_oop copy;
  54     st_smi size;
  55
  56     size = st_smi_value (st_arrayed_object_size (object));
  57
  58     copy = allocate_arrayed (memory->moving_space, st_object_class (object), size);
  59
  60     memcpy (st_word_array_elements (copy),
  61             st_word_array_elements (object),
  62             sizeof (st_uint) * size);
  63
  64     return copy;
  65 }
  66
  67 static st_uint
  68 word_array_size (st_oop object)
  69 {
  70     return ST_SIZE_OOPS (struct st_arrayed_object)
  71         + (st_smi_value (st_arrayed_object_size (object)) / (sizeof (st_oop) / sizeof (st_uint)));
  72 }
  73
  74 static void
  75 word_array_contents (st_oop object, struct contents *contents)
  76 {
  77     contents->oops = NULL;
  78     contents->size = 0;
  79 }
  80
  81 st_descriptor *
  82 st_word_array_descriptor (void)
  83 {
  84     static st_descriptor __descriptor =
  85         { .allocate         = NULL,
  86           .allocate_arrayed = allocate_arrayed,
  87           .copy             = word_array_copy,
  88           .size             = word_array_size,
  89           .contents         = word_array_contents,
  90         };
  91     return & __descriptor;
  92 }
  93