libgfortran/runtime/in_pack_generic.c

   1 /* Generic helper function for repacking arrays.
   2    Copyright (C) 2003-2017 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_pack (gfc_array_char *);
  30 export_proto(internal_pack);
  31
  32 void *
  33 internal_pack (gfc_array_char * source)
  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 ssize;
  41   const char *src;
  42   char *dest;
  43   void *destptr;
  44   int n;
  45   int packed;
  46   index_type size;
  47   index_type type_size;
  48
  49   if (source->base_addr == NULL)
  50     return NULL;
  51
  52   type_size = GFC_DTYPE_TYPE_SIZE(source);
  53   size = GFC_DESCRIPTOR_SIZE (source);
  54   switch (type_size)
  55     {
  56     case GFC_DTYPE_INTEGER_1:
  57     case GFC_DTYPE_LOGICAL_1:
  58     case GFC_DTYPE_DERIVED_1:
  59       return internal_pack_1 ((gfc_array_i1 *) source);
  60
  61     case GFC_DTYPE_INTEGER_2:
  62     case GFC_DTYPE_LOGICAL_2:
  63       return internal_pack_2 ((gfc_array_i2 *) source);
  64
  65     case GFC_DTYPE_INTEGER_4:
  66     case GFC_DTYPE_LOGICAL_4:
  67       return internal_pack_4 ((gfc_array_i4 *) source);
  68
  69     case GFC_DTYPE_INTEGER_8:
  70     case GFC_DTYPE_LOGICAL_8:
  71       return internal_pack_8 ((gfc_array_i8 *) source);
  72
  73 #if defined(HAVE_GFC_INTEGER_16)
  74     case GFC_DTYPE_INTEGER_16:
  75     case GFC_DTYPE_LOGICAL_16:
  76       return internal_pack_16 ((gfc_array_i16 *) source);
  77 #endif
  78     case GFC_DTYPE_REAL_4:
  79       return internal_pack_r4 ((gfc_array_r4 *) source);
  80
  81     case GFC_DTYPE_REAL_8:
  82       return internal_pack_r8 ((gfc_array_r8 *) source);
  83
  84 /* FIXME: This here is a hack, which will have to be removed when
  85    the array descriptor is reworked.  Currently, we don't store the
  86    kind value for the type, but only the size.  Because on targets with
  87    __float128, we have sizeof(logn double) == sizeof(__float128),
  88    we cannot discriminate here and have to fall back to the generic
  89    handling (which is suboptimal).  */
  90 #if !defined(GFC_REAL_16_IS_FLOAT128)
  91 # if defined (HAVE_GFC_REAL_10)
  92     case GFC_DTYPE_REAL_10:
  93       return internal_pack_r10 ((gfc_array_r10 *) source);
  94 # endif
  95
  96 # if defined (HAVE_GFC_REAL_16)
  97     case GFC_DTYPE_REAL_16:
  98       return internal_pack_r16 ((gfc_array_r16 *) source);
  99 # endif
 100 #endif
 101
 102     case GFC_DTYPE_COMPLEX_4:
 103       return internal_pack_c4 ((gfc_array_c4 *) source);
 104
 105     case GFC_DTYPE_COMPLEX_8:
 106       return internal_pack_c8 ((gfc_array_c8 *) source);
 107
 108 /* FIXME: This here is a hack, which will have to be removed when
 109    the array descriptor is reworked.  Currently, we don't store the
 110    kind value for the type, but only the size.  Because on targets with
 111    __float128, we have sizeof(logn double) == sizeof(__float128),
 112    we cannot discriminate here and have to fall back to the generic
 113    handling (which is suboptimal).  */
 114 #if !defined(GFC_REAL_16_IS_FLOAT128)
 115 # if defined (HAVE_GFC_COMPLEX_10)
 116     case GFC_DTYPE_COMPLEX_10:
 117       return internal_pack_c10 ((gfc_array_c10 *) source);
 118 # endif
 119
 120 # if defined (HAVE_GFC_COMPLEX_16)
 121     case GFC_DTYPE_COMPLEX_16:
 122       return internal_pack_c16 ((gfc_array_c16 *) source);
 123 # endif
 124 #endif
 125
 126     case GFC_DTYPE_DERIVED_2:
 127       if (GFC_UNALIGNED_2(source->base_addr))
 128         break;
 129       else
 130         return internal_pack_2 ((gfc_array_i2 *) source);
 131
 132     case GFC_DTYPE_DERIVED_4:
 133       if (GFC_UNALIGNED_4(source->base_addr))
 134         break;
 135       else
 136         return internal_pack_4 ((gfc_array_i4 *) source);
 137
 138     case GFC_DTYPE_DERIVED_8:
 139       if (GFC_UNALIGNED_8(source->base_addr))
 140         break;
 141       else
 142         return internal_pack_8 ((gfc_array_i8 *) source);
 143
 144 #ifdef HAVE_GFC_INTEGER_16
 145     case GFC_DTYPE_DERIVED_16:
 146       if (GFC_UNALIGNED_16(source->base_addr))
 147         break;
 148       else
 149         return internal_pack_16 ((gfc_array_i16 *) source);
 150 #endif
 151
 152     default:
 153       break;
 154     }
 155
 156   dim = GFC_DESCRIPTOR_RANK (source);
 157   ssize = 1;
 158   packed = 1;
 159   for (n = 0; n < dim; n++)
 160     {
 161       count[n] = 0;
 162       stride[n] = GFC_DESCRIPTOR_STRIDE(source,n);
 163       extent[n] = GFC_DESCRIPTOR_EXTENT(source,n);
 164       if (extent[n] <= 0)
 165         {
 166           /* Do nothing.  */
 167           packed = 1;
 168           break;
 169         }
 170
 171       if (ssize != stride[n])
 172         packed = 0;
 173
 174       ssize *= extent[n];
 175     }
 176
 177   if (packed)
 178     return source->base_addr;
 179
 180    /* Allocate storage for the destination.  */
 181   destptr = xmallocarray (ssize, size);
 182   dest = (char *)destptr;
 183   src = source->base_addr;
 184   stride0 = stride[0] * size;
 185
 186   while (src)
 187     {
 188       /* Copy the data.  */
 189       memcpy(dest, src, size);
 190       /* Advance to the next element.  */
 191       dest += size;
 192       src += stride0;
 193       count[0]++;
 194       /* Advance to the next source element.  */
 195       n = 0;
 196       while (count[n] == extent[n])
 197         {
 198           /* When we get to the end of a dimension, reset it and increment
 199              the next dimension.  */
 200           count[n] = 0;
 201           /* We could precalculate these products, but this is a less
 202              frequently used path so probably not worth it.  */
 203           src -= stride[n] * extent[n] * size;
 204           n++;
 205           if (n == dim)
 206             {
 207               src = NULL;
 208               break;
 209             }
 210           else
 211             {
 212               count[n]++;
 213               src += stride[n] * size;
 214             }
 215         }
 216     }
 217   return destptr;
 218 }