libgfortran/runtime/in_unpack_generic.c

   1 /* Generic helper function for repacking arrays.
   2    Copyright (C) 2003-2018 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 <string.h>
  28
  29 extern void internal_unpack (gfc_array_char *, const void *);
  30 export_proto(internal_unpack);
  31
  32 void
  33 internal_unpack (gfc_array_char * d, const void * s)
  34 {
  35   index_type count[GFC_MAX_DIMENSIONS];
  36   index_type extent[GFC_MAX_DIMENSIONS];
  37   index_type stride[GFC_MAX_DIMENSIONS];
  38   index_type stride0;
  39   index_type dim;
  40   index_type dsize;
  41   char *dest;
  42   const char *src;
  43   int n;
  44   int size;
  45   int type_size;
  46
  47   dest = d->base_addr;
  48   /* This check may be redundant, but do it anyway.  */
  49   if (s == dest || !s)
  50     return;
  51
  52   type_size = GFC_DTYPE_TYPE_SIZE (d);
  53   switch (type_size)
  54     {
  55     case GFC_DTYPE_INTEGER_1:
  56     case GFC_DTYPE_LOGICAL_1:
  57     case GFC_DTYPE_DERIVED_1:
  58       internal_unpack_1 ((gfc_array_i1 *) d, (const GFC_INTEGER_1 *) s);
  59       return;
  60
  61     case GFC_DTYPE_INTEGER_2:
  62     case GFC_DTYPE_LOGICAL_2:
  63       internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
  64       return;
  65
  66     case GFC_DTYPE_INTEGER_4:
  67     case GFC_DTYPE_LOGICAL_4:
  68       internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
  69       return;
  70
  71     case GFC_DTYPE_INTEGER_8:
  72     case GFC_DTYPE_LOGICAL_8:
  73       internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
  74       return;
  75
  76 #if defined (HAVE_GFC_INTEGER_16)
  77     case GFC_DTYPE_INTEGER_16:
  78     case GFC_DTYPE_LOGICAL_16:
  79       internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
  80       return;
  81 #endif
  82
  83     case GFC_DTYPE_REAL_4:
  84       internal_unpack_r4 ((gfc_array_r4 *) d, (const GFC_REAL_4 *) s);
  85       return;
  86
  87     case GFC_DTYPE_REAL_8:
  88       internal_unpack_r8 ((gfc_array_r8 *) d, (const GFC_REAL_8 *) s);
  89       return;
  90
  91 /* FIXME: This here is a hack, which will have to be removed when
  92    the array descriptor is reworked.  Currently, we don't store the
  93    kind value for the type, but only the size.  Because on targets with
  94    __float128, we have sizeof(logn double) == sizeof(__float128),
  95    we cannot discriminate here and have to fall back to the generic
  96    handling (which is suboptimal).  */
  97 #if !defined(GFC_REAL_16_IS_FLOAT128)
  98 # if defined(HAVE_GFC_REAL_10)
  99     case GFC_DTYPE_REAL_10:
 100       internal_unpack_r10 ((gfc_array_r10 *) d, (const GFC_REAL_10 *) s);
 101       return;
 102 # endif
 103
 104 # if defined(HAVE_GFC_REAL_16)
 105     case GFC_DTYPE_REAL_16:
 106       internal_unpack_r16 ((gfc_array_r16 *) d, (const GFC_REAL_16 *) s);
 107       return;
 108 # endif
 109 #endif
 110
 111     case GFC_DTYPE_COMPLEX_4:
 112       internal_unpack_c4 ((gfc_array_c4 *)d, (const GFC_COMPLEX_4 *)s);
 113       return;
 114
 115     case GFC_DTYPE_COMPLEX_8:
 116       internal_unpack_c8 ((gfc_array_c8 *)d, (const GFC_COMPLEX_8 *)s);
 117       return;
 118
 119 /* FIXME: This here is a hack, which will have to be removed when
 120    the array descriptor is reworked.  Currently, we don't store the
 121    kind value for the type, but only the size.  Because on targets with
 122    __float128, we have sizeof(logn double) == sizeof(__float128),
 123    we cannot discriminate here and have to fall back to the generic
 124    handling (which is suboptimal).  */
 125 #if !defined(GFC_REAL_16_IS_FLOAT128)
 126 # if defined(HAVE_GFC_COMPLEX_10)
 127     case GFC_DTYPE_COMPLEX_10:
 128       internal_unpack_c10 ((gfc_array_c10 *) d, (const GFC_COMPLEX_10 *) s);
 129       return;
 130 # endif
 131
 132 # if defined(HAVE_GFC_COMPLEX_16)
 133     case GFC_DTYPE_COMPLEX_16:
 134       internal_unpack_c16 ((gfc_array_c16 *) d, (const GFC_COMPLEX_16 *) s);
 135       return;
 136 # endif
 137 #endif
 138
 139     case GFC_DTYPE_DERIVED_2:
 140       if (GFC_UNALIGNED_2(d->base_addr) || GFC_UNALIGNED_2(s))
 141         break;
 142       else
 143         {
 144           internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
 145           return;
 146         }
 147     case GFC_DTYPE_DERIVED_4:
 148       if (GFC_UNALIGNED_4(d->base_addr) || GFC_UNALIGNED_4(s))
 149         break;
 150       else
 151         {
 152           internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
 153           return;
 154         }
 155
 156     case GFC_DTYPE_DERIVED_8:
 157       if (GFC_UNALIGNED_8(d->base_addr) || GFC_UNALIGNED_8(s))
 158         break;
 159       else
 160         {
 161           internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
 162           return;
 163         }
 164
 165 #ifdef HAVE_GFC_INTEGER_16
 166     case GFC_DTYPE_DERIVED_16:
 167       if (GFC_UNALIGNED_16(d->base_addr) || GFC_UNALIGNED_16(s))
 168         break;
 169       else
 170         {
 171           internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
 172           return;
 173         }
 174 #endif
 175
 176     default:
 177       break;
 178     }
 179
 180   size = GFC_DESCRIPTOR_SIZE (d);
 181
 182   dim = GFC_DESCRIPTOR_RANK (d);
 183   dsize = 1;
 184   for (n = 0; n < dim; n++)
 185     {
 186       count[n] = 0;
 187       stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);
 188       extent[n] = GFC_DESCRIPTOR_EXTENT(d,n);
 189       if (extent[n] <= 0)
 190         return;
 191
 192       if (dsize == stride[n])
 193         dsize *= extent[n];
 194       else
 195         dsize = 0;
 196     }
 197
 198   src = s;
 199
 200   if (dsize != 0)
 201     {
 202       memcpy (dest, src, dsize * size);
 203       return;
 204     }
 205
 206   stride0 = stride[0] * size;
 207
 208   while (dest)
 209     {
 210       /* Copy the data.  */
 211       memcpy (dest, src, size);
 212       /* Advance to the next element.  */
 213       src += size;
 214       dest += stride0;
 215       count[0]++;
 216       /* Advance to the next source element.  */
 217       n = 0;
 218       while (count[n] == extent[n])
 219         {
 220           /* When we get to the end of a dimension, reset it and increment
 221              the next dimension.  */
 222           count[n] = 0;
 223           /* We could precalculate these products, but this is a less
 224              frequently used path so probably not worth it.  */
 225           dest -= stride[n] * extent[n] * size;
 226           n++;
 227           if (n == dim)
 228             {
 229               dest = NULL;
 230               break;
 231             }
 232           else
 233             {
 234               count[n]++;
 235               dest += stride[n] * size;
 236             }
 237         }
 238     }
 239 }