libgfortran/runtime/in_unpack_generic.c

   1 /* Generic helper function for repacking arrays.
   2    Copyright 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
   6
   7 Libgfortran is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU General Public
   9 License as published by the Free Software Foundation; either
  10 version 2 of the License, or (at your option) any later version.
  11
  12 In addition to the permissions in the GNU General Public License, the
  13 Free Software Foundation gives you unlimited permission to link the
  14 compiled version of this file into combinations with other programs,
  15 and to distribute those combinations without any restriction coming
  16 from the use of this file.  (The General Public License restrictions
  17 do apply in other respects; for example, they cover modification of
  18 the file, and distribution when not linked into a combine
  19 executable.)
  20
  21 Libgfortran is distributed in the hope that it will be useful,
  22 but WITHOUT ANY WARRANTY; without even the implied warranty of
  23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24 GNU General Public License for more details.
  25
  26 You should have received a copy of the GNU General Public
  27 License along with libgfortran; see the file COPYING.  If not,
  28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  29 Boston, MA 02110-1301, USA.  */
  30
  31 #include "libgfortran.h"
  32 #include <stdlib.h>
  33 #include <assert.h>
  34 #include <string.h>
  35
  36 extern void internal_unpack (gfc_array_char *, const void *);
  37 export_proto(internal_unpack);
  38
  39 void
  40 internal_unpack (gfc_array_char * d, const void * s)
  41 {
  42   index_type count[GFC_MAX_DIMENSIONS];
  43   index_type extent[GFC_MAX_DIMENSIONS];
  44   index_type stride[GFC_MAX_DIMENSIONS];
  45   index_type stride0;
  46   index_type dim;
  47   index_type dsize;
  48   char *dest;
  49   const char *src;
  50   int n;
  51   int size;
  52   int type_size;
  53
  54   dest = d->data;
  55   /* This check may be redundant, but do it anyway.  */
  56   if (s == dest || !s)
  57     return;
  58
  59   type_size = GFC_DTYPE_TYPE_SIZE (d);
  60   switch (type_size)
  61     {
  62     case GFC_DTYPE_INTEGER_1:
  63     case GFC_DTYPE_LOGICAL_1:
  64     case GFC_DTYPE_DERIVED_1:
  65       internal_unpack_1 ((gfc_array_i1 *) d, (const GFC_INTEGER_1 *) s);
  66       return;
  67
  68     case GFC_DTYPE_INTEGER_2:
  69     case GFC_DTYPE_LOGICAL_2:
  70       internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
  71       return;
  72
  73     case GFC_DTYPE_INTEGER_4:
  74     case GFC_DTYPE_LOGICAL_4:
  75       internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
  76       return;
  77
  78     case GFC_DTYPE_INTEGER_8:
  79     case GFC_DTYPE_LOGICAL_8:
  80       internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
  81       return;
  82
  83 #if defined (HAVE_GFC_INTEGER_16)
  84     case GFC_DTYPE_INTEGER_16:
  85     case GFC_DTYPE_LOGICAL_16:
  86       internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
  87       return;
  88 #endif
  89     case GFC_DTYPE_REAL_4:
  90       internal_unpack_r4 ((gfc_array_r4 *) d, (const GFC_REAL_4 *) s);
  91       return;
  92
  93     case GFC_DTYPE_REAL_8:
  94       internal_unpack_r8 ((gfc_array_r8 *) d, (const GFC_REAL_8 *) s);
  95       return;
  96
  97 #if defined(HAVE_GFC_REAL_10)
  98     case GFC_DTYPE_REAL_10:
  99       internal_unpack_r10 ((gfc_array_r10 *) d, (const GFC_REAL_10 *) s);
 100       return;
 101 #endif
 102
 103 #if defined(HAVE_GFC_REAL_16)
 104     case GFC_DTYPE_REAL_16:
 105       internal_unpack_r16 ((gfc_array_r16 *) d, (const GFC_REAL_16 *) s);
 106       return;
 107 #endif
 108     case GFC_DTYPE_COMPLEX_4:
 109       internal_unpack_c4 ((gfc_array_c4 *)d, (const GFC_COMPLEX_4 *)s);
 110       return;
 111
 112     case GFC_DTYPE_COMPLEX_8:
 113       internal_unpack_c8 ((gfc_array_c8 *)d, (const GFC_COMPLEX_8 *)s);
 114       return;
 115
 116 #if defined(HAVE_GFC_COMPLEX_10)
 117     case GFC_DTYPE_COMPLEX_10:
 118       internal_unpack_c10 ((gfc_array_c10 *) d, (const GFC_COMPLEX_10 *) s);
 119       return;
 120 #endif
 121
 122 #if defined(HAVE_GFC_COMPLEX_16)
 123     case GFC_DTYPE_COMPLEX_16:
 124       internal_unpack_c16 ((gfc_array_c16 *) d, (const GFC_COMPLEX_16 *) s);
 125       return;
 126 #endif
 127     case GFC_DTYPE_DERIVED_2:
 128       if (GFC_UNALIGNED_2(d->data) || GFC_UNALIGNED_2(s))
 129         break;
 130       else
 131         {
 132           internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
 133           return;
 134         }
 135     case GFC_DTYPE_DERIVED_4:
 136       if (GFC_UNALIGNED_4(d->data) || GFC_UNALIGNED_4(s))
 137         break;
 138       else
 139         {
 140           internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
 141           return;
 142         }
 143
 144     case GFC_DTYPE_DERIVED_8:
 145       if (GFC_UNALIGNED_8(d->data) || GFC_UNALIGNED_8(s))
 146         break;
 147       else
 148         {
 149           internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
 150           return;
 151         }
 152
 153 #ifdef HAVE_GFC_INTEGER_16
 154     case GFC_DTYPE_DERIVED_16:
 155       if (GFC_UNALIGNED_16(d->data) || GFC_UNALIGNED_16(s))
 156         break;
 157       else
 158         {
 159           internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
 160           return;
 161         }
 162 #endif
 163
 164     default:
 165       break;
 166     }
 167
 168   size = GFC_DESCRIPTOR_SIZE (d);
 169
 170   if (d->dim[0].stride == 0)
 171     d->dim[0].stride = 1;
 172
 173   dim = GFC_DESCRIPTOR_RANK (d);
 174   dsize = 1;
 175   for (n = 0; n < dim; n++)
 176     {
 177       count[n] = 0;
 178       stride[n] = d->dim[n].stride;
 179       extent[n] = d->dim[n].ubound + 1 - d->dim[n].lbound;
 180       if (extent[n] <= 0)
 181         return;
 182
 183       if (dsize == stride[n])
 184         dsize *= extent[n];
 185       else
 186         dsize = 0;
 187     }
 188
 189   src = s;
 190
 191   if (dsize != 0)
 192     {
 193       memcpy (dest, src, dsize * size);
 194       return;
 195     }
 196
 197   stride0 = stride[0] * size;
 198
 199   while (dest)
 200     {
 201       /* Copy the data.  */
 202       memcpy (dest, src, size);
 203       /* Advance to the next element.  */
 204       src += size;
 205       dest += stride0;
 206       count[0]++;
 207       /* Advance to the next source element.  */
 208       n = 0;
 209       while (count[n] == extent[n])
 210         {
 211           /* When we get to the end of a dimension, reset it and increment
 212              the next dimension.  */
 213           count[n] = 0;
 214           /* We could precalculate these products, but this is a less
 215              frequently used path so probably not worth it.  */
 216           dest -= stride[n] * extent[n] * size;
 217           n++;
 218           if (n == dim)
 219             {
 220               dest = NULL;
 221               break;
 222             }
 223           else
 224             {
 225               count[n]++;
 226               dest += stride[n] * size;
 227             }
 228         }
 229     }
 230 }