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/* Class specific helper function for repacking arrays.
Copyright (C) 2003-2025 Free Software Foundation, Inc.
Contributed by Paul Brook <paul@nowt.org>
This file is part of the GNU Fortran runtime library (libgfortran).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
#include "libgfortran.h"
#include <string.h>
extern void
internal_pack_class (gfc_class_array_t *, gfc_class_array_t *, const size_t,
const int);
export_proto (internal_pack_class);
/* attr is a bitfield. The bits in use are:
0 - _len is present.
*/
void
internal_pack_class (gfc_class_array_t *dest_class,
gfc_class_array_t *source_class, const size_t size_class,
const int attr)
{
#define BIT_TEST(mask, bit) (((mask) & (1U << (bit))) == (1U << (bit)))
index_type count[GFC_MAX_DIMENSIONS];
index_type extent[GFC_MAX_DIMENSIONS];
index_type stride[GFC_MAX_DIMENSIONS];
index_type stride0;
index_type dim;
index_type ssize;
index_type dest_stride;
index_type n;
const void *src;
void *dest;
int packed;
index_type size;
gfc_array_void *source_arr;
gfc_array_void *dest_arr;
size_t dest_offset;
bool len_present = BIT_TEST (attr, 0);
gfc_vtype_generic_t *vtab;
void (*copyfn) (const void *, void *);
/* Always make sure the dest is initialized. */
memcpy (dest_class, source_class, size_class);
if (source_class->_data.base_addr == NULL)
return;
source_arr = (gfc_array_void *) &(source_class->_data);
size = GFC_DESCRIPTOR_SIZE (source_arr);
dim = GFC_DESCRIPTOR_RANK (source_arr);
ssize = 1;
packed = 1;
for (n = 0; n < dim; n++)
{
count[n] = 0;
stride[n] = GFC_DESCRIPTOR_STRIDE (source_arr, n);
extent[n] = GFC_DESCRIPTOR_EXTENT (source_arr, n);
if (extent[n] <= 0)
{
/* Do nothing. */
packed = 1;
break;
}
if (ssize != stride[n])
packed = 0;
ssize *= extent[n];
}
/* When the data is packed already, nothing needs to be done and unpack, will
quit immediately, because _data is identical and nothing needs to be done.
*/
if (packed)
return;
/* Allocate storage for the destination. */
dest_arr = (gfc_array_void *) &dest_class->_data;
dest_stride = 1;
dest_offset = 0;
for (n = 0; n < dim; ++n)
{
GFC_DESCRIPTOR_LBOUND (dest_arr, n) = 1;
GFC_DESCRIPTOR_UBOUND (dest_arr, n) = extent[n];
GFC_DESCRIPTOR_STRIDE (dest_arr, n) = dest_stride;
dest_offset -= dest_stride * 1 /* GFC_DESCRIPTOR_LBOUND (dest_arr, n) */;
dest_stride *= GFC_DESCRIPTOR_EXTENT (dest_arr, n);
}
dest_arr->offset = dest_offset;
dest_arr->base_addr = xmallocarray (ssize, size);
dest = (void *) dest_arr->base_addr;
src = source_arr->base_addr;
stride0 = stride[0] * size;
/* Can not use the dimension here, because the class may be allocated for
a higher dimensional array, but only a smaller amount is present. */
vtab = *(gfc_vtype_generic_t **) (((void *) source_class) + size_class
- (len_present ? sizeof (size_t) : 0)
- sizeof (void *)); /* _vptr */
copyfn = vtab->_copy;
while (src)
{
/* Copy the data. */
copyfn (src, dest);
/* Advance to the next element. */
dest += size;
src += stride0;
count[0]++;
/* Advance to the next source element. */
n = 0;
while (count[n] == extent[n])
{
/* When we get to the end of a dimension, reset it and increment
the next dimension. */
count[n] = 0;
/* We could precalculate these products, but this is a less
frequently used path so probably not worth it. */
src -= stride[n] * extent[n] * size;
n++;
if (n == dim)
{
src = NULL;
break;
}
else
{
count[n]++;
src += stride[n] * size;
}
}
}
}
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