src/st-float-array.c

   1 /*
   2  * st-float-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  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23 */
  24
  25 #include "st-float-array.h"
  26 #include "st-object.h"
  27
  28 static st_oop
  29 allocate_arrayed (st_space *space, st_oop class, st_smi size)
  30 {
  31     st_oop  object;
  32     double *elements;
  33     st_smi  size_oops;
  34
  35     st_assert (size >= 0);
  36
  37     /* get actual size in oops (dependent on whether system is 64bit or 32bit) */
  38     size_oops = size * (sizeof (double) / sizeof (st_oop));
  39
  40     object = st_space_allocate_object (space, class, ST_SIZE_OOPS (struct st_float_array) + size_oops);
  41     ST_ARRAYED_OBJECT (object)->size = st_smi_new (size);
  42
  43     elements = ST_FLOAT_ARRAY (object)->elements;
  44     for (st_smi i = 0; i < size; i++)
  45         elements[i] = (double) 0;
  46
  47     return object;
  48 }
  49
  50 static st_oop
  51 float_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_HEADER (object)->class, size);
  59
  60     memcpy (st_float_array_elements (copy),
  61             st_float_array_elements (object),
  62             sizeof (double) * size);
  63
  64     return copy;
  65 }
  66
  67 static st_uint
  68 float_array_size (st_oop object)
  69 {
  70     return ST_SIZE_OOPS (struct st_arrayed_object) + (st_smi_value (st_arrayed_object_size (object)) * ST_SIZE_OOPS (double));
  71 }
  72
  73 static void
  74 float_array_contents (st_oop object, struct contents *contents)
  75 {
  76     contents->oops = NULL;
  77     contents->size = 0;
  78 }
  79
  80 st_descriptor *
  81 st_float_array_descriptor (void)
  82 {
  83     static st_descriptor __descriptor =
  84         { .allocate         = NULL,
  85           .allocate_arrayed = allocate_arrayed,
  86           .copy             = float_array_copy,
  87           .size             = float_array_size,
  88           .contents         = float_array_contents,
  89         };
  90
  91     return & __descriptor;
  92 }