71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
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/* Virtual array support.
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Copyright (C) 1998 Free Software Foundation, Inc.
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Contributed by Cygnus Solutions.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to the Free
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "rtl.h"
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#include "tree.h"
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#include "bitmap.h"
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#include "varray.h"
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#define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))
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/* Allocate a virtual array with NUM_ELEMENT elements, each of which is
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ELEMENT_SIZE bytes long, named NAME. Array elements are zeroed. */
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varray_type
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varray_init (num_elements, element_size, name)
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size_t num_elements;
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size_t element_size;
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const char *name;
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{
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size_t data_size = num_elements * element_size;
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varray_type ptr = (varray_type) xcalloc (VARRAY_HDR_SIZE + data_size, 1);
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ptr->num_elements = num_elements;
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ptr->element_size = element_size;
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ptr->name = name;
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return ptr;
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}
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/* Grow/shrink the virtual array VA to N elements. Zero any new elements
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allocated. */
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varray_type
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varray_grow (va, n)
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varray_type va;
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size_t n;
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{
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size_t old_elements = va->num_elements;
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if (n != old_elements)
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{
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size_t element_size = va->element_size;
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size_t old_data_size = old_elements * element_size;
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size_t data_size = n * element_size;
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va = (varray_type) xrealloc ((char *)va, VARRAY_HDR_SIZE + data_size);
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va->num_elements = n;
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if (n > old_elements)
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zero_memory (&va->data.c[old_data_size], data_size - old_data_size);
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}
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return va;
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}
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