libgfortran/runtime/in_unpack_generic.c

   1 /* Generic helper function for repacking arrays.
   2    Copyright (C) 2003-2015 Free Software Foundation, Inc.
   3    Contributed by Paul Brook <paul@nowt.org>
   4
   5 This file is part of the GNU Fortran 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 3 of the License, or (at your option) any later version.
  11
  12 Libgfortran is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "libgfortran.h"
  27 #include <stdlib.h>
  28 #include <assert.h>
  29 #include <string.h>
  30
  31 extern void internal_unpack (gfc_array_char *, const void *);
  32 export_proto(internal_unpack);
  33
  34 void
  35 internal_unpack (gfc_array_char * d, const void * s)
  36 {
  37   index_type count[GFC_MAX_DIMENSIONS];
  38   index_type extent[GFC_MAX_DIMENSIONS];
  39   index_type stride[GFC_MAX_DIMENSIONS];
  40   index_type stride0;
  41   index_type dim;
  42   index_type dsize;
  43   char *dest;
  44   const char *src;
  45   int n;
  46   int size;
  47   int type_size;
  48
  49   dest = d->base_addr;
  50   /* This check may be redundant, but do it anyway.  */
  51   if (s == dest || !s)
  52     return;
  53
  54   type_size = GFC_DTYPE_TYPE_SIZE (d);
  55   switch (type_size)
  56     {
  57     case GFC_DTYPE_INTEGER_1:
  58     case GFC_DTYPE_LOGICAL_1:
  59     case GFC_DTYPE_DERIVED_1:
  60       internal_unpack_1 ((gfc_array_i1 *) d, (const GFC_INTEGER_1 *) s);
  61       return;
  62
  63     case GFC_DTYPE_INTEGER_2:
  64     case GFC_DTYPE_LOGICAL_2:
  65       internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
  66       return;
  67
  68     case GFC_DTYPE_INTEGER_4:
  69     case GFC_DTYPE_LOGICAL_4:
  70       internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
  71       return;
  72
  73     case GFC_DTYPE_INTEGER_8:
  74     case GFC_DTYPE_LOGICAL_8:
  75       internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
  76       return;
  77
  78 #if defined (HAVE_GFC_INTEGER_16)
  79     case GFC_DTYPE_INTEGER_16:
  80     case GFC_DTYPE_LOGICAL_16:
  81       internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
  82       return;
  83 #endif
  84
  85     case GFC_DTYPE_REAL_4:
  86       internal_unpack_r4 ((gfc_array_r4 *) d, (const GFC_REAL_4 *) s);
  87       return;
  88
  89     case GFC_DTYPE_REAL_8:
  90       internal_unpack_r8 ((gfc_array_r8 *) d, (const GFC_REAL_8 *) s);
  91       return;
  92
  93 /* FIXME: This here is a hack, which will have to be removed when
  94    the array descriptor is reworked.  Currently, we don't store the
  95    kind value for the type, but only the size.  Because on targets with
  96    __float128, we have sizeof(logn double) == sizeof(__float128),
  97    we cannot discriminate here and have to fall back to the generic
  98    handling (which is suboptimal).  */
  99 #if !defined(GFC_REAL_16_IS_FLOAT128)
 100 # if defined(HAVE_GFC_REAL_10)
 101     case GFC_DTYPE_REAL_10:
 102       internal_unpack_r10 ((gfc_array_r10 *) d, (const GFC_REAL_10 *) s);
 103       return;
 104 # endif
 105
 106 # if defined(HAVE_GFC_REAL_16)
 107     case GFC_DTYPE_REAL_16:
 108       internal_unpack_r16 ((gfc_array_r16 *) d, (const GFC_REAL_16 *) s);
 109       return;
 110 # endif
 111 #endif
 112
 113     case GFC_DTYPE_COMPLEX_4:
 114       internal_unpack_c4 ((gfc_array_c4 *)d, (const GFC_COMPLEX_4 *)s);
 115       return;
 116
 117     case GFC_DTYPE_COMPLEX_8:
 118       internal_unpack_c8 ((gfc_array_c8 *)d, (const GFC_COMPLEX_8 *)s);
 119       return;
 120
 121 /* FIXME: This here is a hack, which will have to be removed when
 122    the array descriptor is reworked.  Currently, we don't store the
 123    kind value for the type, but only the size.  Because on targets with
 124    __float128, we have sizeof(logn double) == sizeof(__float128),
 125    we cannot discriminate here and have to fall back to the generic
 126    handling (which is suboptimal).  */
 127 #if !defined(GFC_REAL_16_IS_FLOAT128)
 128 # if defined(HAVE_GFC_COMPLEX_10)
 129     case GFC_DTYPE_COMPLEX_10:
 130       internal_unpack_c10 ((gfc_array_c10 *) d, (const GFC_COMPLEX_10 *) s);
 131       return;
 132 # endif
 133
 134 # if defined(HAVE_GFC_COMPLEX_16)
 135     case GFC_DTYPE_COMPLEX_16:
 136       internal_unpack_c16 ((gfc_array_c16 *) d, (const GFC_COMPLEX_16 *) s);
 137       return;
 138 # endif
 139 #endif
 140
 141     case GFC_DTYPE_DERIVED_2:
 142       if (GFC_UNALIGNED_2(d->base_addr) || GFC_UNALIGNED_2(s))
 143         break;
 144       else
 145         {
 146           internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
 147           return;
 148         }
 149     case GFC_DTYPE_DERIVED_4:
 150       if (GFC_UNALIGNED_4(d->base_addr) || GFC_UNALIGNED_4(s))
 151         break;
 152       else
 153         {
 154           internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
 155           return;
 156         }
 157
 158     case GFC_DTYPE_DERIVED_8:
 159       if (GFC_UNALIGNED_8(d->base_addr) || GFC_UNALIGNED_8(s))
 160         break;
 161       else
 162         {
 163           internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
 164           return;
 165         }
 166
 167 #ifdef HAVE_GFC_INTEGER_16
 168     case GFC_DTYPE_DERIVED_16:
 169       if (GFC_UNALIGNED_16(d->base_addr) || GFC_UNALIGNED_16(s))
 170         break;
 171       else
 172         {
 173           internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
 174           return;
 175         }
 176 #endif
 177
 178     default:
 179       break;
 180     }
 181
 182   size = GFC_DESCRIPTOR_SIZE (d);
 183
 184   dim = GFC_DESCRIPTOR_RANK (d);
 185   dsize = 1;
 186   for (n = 0; n < dim; n++)
 187     {
 188       count[n] = 0;
 189       stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);
 190       extent[n] = GFC_DESCRIPTOR_EXTENT(d,n);
 191       if (extent[n] <= 0)
 192         return;
 193
 194       if (dsize == stride[n])
 195         dsize *= extent[n];
 196       else
 197         dsize = 0;
 198     }
 199
 200   src = s;
 201
 202   if (dsize != 0)
 203     {
 204       memcpy (dest, src, dsize * size);
 205       return;
 206     }
 207
 208   stride0 = stride[0] * size;
 209
 210   while (dest)
 211     {
 212       /* Copy the data.  */
 213       memcpy (dest, src, size);
 214       /* Advance to the next element.  */
 215       src += size;
 216       dest += stride0;
 217       count[0]++;
 218       /* Advance to the next source element.  */
 219       n = 0;
 220       while (count[n] == extent[n])
 221         {
 222           /* When we get to the end of a dimension, reset it and increment
 223              the next dimension.  */
 224           count[n] = 0;
 225           /* We could precalculate these products, but this is a less
 226              frequently used path so probably not worth it.  */
 227           dest -= stride[n] * extent[n] * size;
 228           n++;
 229           if (n == dim)
 230             {
 231               dest = NULL;
 232               break;
 233             }
 234           else
 235             {
 236               count[n]++;
 237               dest += stride[n] * size;
 238             }
 239         }
 240     }
 241 }