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126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
/* Deep copy support for allocatable components in derived types.
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Copyright (C) 2025-2026 Free Software Foundation, Inc.
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This file is part of the GNU Fortran runtime library (libgfortran).
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Libgfortran is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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Libgfortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgfortran.h"
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#include <string.h>
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/* Runtime helper for deep copying allocatable array components when the
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element type contains nested allocatable components. The front end handles
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allocation and deallocation; this helper performs element-wise copies using
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the compiler-generated element copier so that recursion takes place at
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runtime. */
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static inline size_t
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descriptor_elem_size (gfc_array_void *desc)
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{
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size_t size = GFC_DESCRIPTOR_SIZE (desc);
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return size == 0 ? 1 : size;
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}
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void
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cfi_deep_copy_array (gfc_array_void *dest, gfc_array_void *src,
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void (*copy_element) (void *, void *))
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{
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int rank;
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size_t src_elem_size;
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size_t dest_elem_size;
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index_type extent[GFC_MAX_DIMENSIONS];
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index_type src_stride_bytes[GFC_MAX_DIMENSIONS];
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index_type dest_stride_bytes[GFC_MAX_DIMENSIONS];
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index_type count[GFC_MAX_DIMENSIONS];
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char *src_ptr;
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char *dest_ptr;
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if (src == NULL || dest == NULL)
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return;
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if (GFC_DESCRIPTOR_DATA (src) == NULL)
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{
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if (GFC_DESCRIPTOR_DATA (dest) != NULL)
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internal_error (NULL, "cfi_deep_copy_array: destination must be "
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"deallocated when source is not allocated");
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return;
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}
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if (GFC_DESCRIPTOR_DATA (dest) == NULL)
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internal_error (NULL, "cfi_deep_copy_array: destination not allocated");
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rank = GFC_DESCRIPTOR_RANK (src);
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src_elem_size = descriptor_elem_size (src);
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dest_elem_size = descriptor_elem_size (dest);
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if (rank <= 0)
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{
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memcpy (GFC_DESCRIPTOR_DATA (dest), GFC_DESCRIPTOR_DATA (src),
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src_elem_size);
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if (copy_element != NULL)
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copy_element (GFC_DESCRIPTOR_DATA (dest),
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GFC_DESCRIPTOR_DATA (src));
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return;
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}
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for (int dim = 0; dim < rank; dim++)
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{
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extent[dim] = GFC_DESCRIPTOR_EXTENT (src, dim);
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if (extent[dim] <= 0)
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return;
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src_stride_bytes[dim]
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= GFC_DESCRIPTOR_STRIDE (src, dim) * src_elem_size;
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dest_stride_bytes[dim]
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= GFC_DESCRIPTOR_STRIDE (dest, dim) * dest_elem_size;
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count[dim] = 0;
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}
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src_ptr = (char *) GFC_DESCRIPTOR_DATA (src);
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dest_ptr = (char *) GFC_DESCRIPTOR_DATA (dest);
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while (true)
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{
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memcpy (dest_ptr, src_ptr, src_elem_size);
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if (copy_element != NULL)
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copy_element (dest_ptr, src_ptr);
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dest_ptr += dest_stride_bytes[0];
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src_ptr += src_stride_bytes[0];
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count[0]++;
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int dim = 0;
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while (count[dim] == extent[dim])
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{
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count[dim] = 0;
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dest_ptr -= dest_stride_bytes[dim] * extent[dim];
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src_ptr -= src_stride_bytes[dim] * extent[dim];
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dim++;
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if (dim == rank)
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return;
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count[dim]++;
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dest_ptr += dest_stride_bytes[dim];
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src_ptr += src_stride_bytes[dim];
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}
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}
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}
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export_proto(cfi_deep_copy_array);
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