324 lines
7.4 KiB
C
324 lines
7.4 KiB
C
/* Memory management routines.
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Copyright 2002, 2005, 2006 Free Software Foundation, Inc.
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Contributed by Paul Brook <paul@nowt.org>
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This file is part of the GNU Fortran 95 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 2 of the License, or (at your option) any later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file into combinations with other programs,
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and to distribute those combinations without any restriction coming
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from the use of this file. (The General Public License restrictions
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do apply in other respects; for example, they cover modification of
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the file, and distribution when not linked into a combine
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executable.)
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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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You should have received a copy of the GNU General Public
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License along with libgfortran; see the file COPYING. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "config.h"
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#include <stdlib.h>
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#include "libgfortran.h"
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/* If GFC_CLEAR_MEMORY is defined, the memory allocation routines will
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return memory that is guaranteed to be set to zero. This can have
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a severe efficiency penalty, so it should never be set if good
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performance is desired, but it can help when you're debugging code. */
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/* #define GFC_CLEAR_MEMORY */
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/* If GFC_CHECK_MEMORY is defined, we do some sanity checks at runtime.
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This causes small overhead, but again, it also helps debugging. */
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#define GFC_CHECK_MEMORY
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void *
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get_mem (size_t n)
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{
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void *p;
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#ifdef GFC_CLEAR_MEMORY
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p = (void *) calloc (1, n);
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#else
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p = (void *) malloc (n);
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#endif
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if (p == NULL)
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os_error ("Memory allocation failed");
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return p;
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}
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void
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free_mem (void *p)
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{
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free (p);
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}
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/* Allocate memory for internal (compiler generated) use. */
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void *
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internal_malloc_size (size_t size)
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{
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if (size == 0)
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return NULL;
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return get_mem (size);
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}
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extern void *internal_malloc (GFC_INTEGER_4);
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export_proto(internal_malloc);
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void *
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internal_malloc (GFC_INTEGER_4 size)
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{
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#ifdef GFC_CHECK_MEMORY
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/* Under normal circumstances, this is _never_ going to happen! */
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if (size < 0)
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runtime_error ("Attempt to allocate a negative amount of memory.");
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#endif
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return internal_malloc_size ((size_t) size);
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}
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extern void *internal_malloc64 (GFC_INTEGER_8);
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export_proto(internal_malloc64);
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void *
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internal_malloc64 (GFC_INTEGER_8 size)
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{
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#ifdef GFC_CHECK_MEMORY
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/* Under normal circumstances, this is _never_ going to happen! */
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if (size < 0)
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runtime_error ("Attempt to allocate a negative amount of memory.");
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#endif
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return internal_malloc_size ((size_t) size);
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}
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/* Free internally allocated memory. Pointer is NULLified. Also used to
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free user allocated memory. */
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void
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internal_free (void *mem)
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{
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if (mem != NULL)
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free (mem);
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}
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iexport(internal_free);
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/* Reallocate internal memory MEM so it has SIZE bytes of data.
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Allocate a new block if MEM is zero, and free the block if
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SIZE is 0. */
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static void *
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internal_realloc_size (void *mem, size_t size)
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{
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if (size == 0)
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{
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if (mem)
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free (mem);
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return NULL;
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}
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if (mem == 0)
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return get_mem (size);
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mem = realloc (mem, size);
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if (!mem)
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os_error ("Out of memory.");
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return mem;
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}
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extern void *internal_realloc (void *, GFC_INTEGER_4);
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export_proto(internal_realloc);
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void *
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internal_realloc (void *mem, GFC_INTEGER_4 size)
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{
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#ifdef GFC_CHECK_MEMORY
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/* Under normal circumstances, this is _never_ going to happen! */
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if (size < 0)
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runtime_error ("Attempt to allocate a negative amount of memory.");
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#endif
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return internal_realloc_size (mem, (size_t) size);
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}
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extern void *internal_realloc64 (void *, GFC_INTEGER_8);
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export_proto(internal_realloc64);
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void *
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internal_realloc64 (void *mem, GFC_INTEGER_8 size)
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{
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#ifdef GFC_CHECK_MEMORY
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/* Under normal circumstances, this is _never_ going to happen! */
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if (size < 0)
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runtime_error ("Attempt to allocate a negative amount of memory.");
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#endif
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return internal_realloc_size (mem, (size_t) size);
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}
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/* User-allocate, one call for each member of the alloc-list of an
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ALLOCATE statement. */
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static void
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allocate_size (void **mem, size_t size, GFC_INTEGER_4 * stat)
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{
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void *newmem;
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if (!mem)
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runtime_error ("Internal: NULL mem pointer in ALLOCATE.");
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newmem = malloc (size ? size : 1);
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if (!newmem)
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{
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if (stat)
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{
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*stat = 1;
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return;
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}
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else
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runtime_error ("ALLOCATE: Out of memory.");
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}
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(*mem) = newmem;
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if (stat)
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*stat = 0;
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}
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extern void allocate (void **, GFC_INTEGER_4, GFC_INTEGER_4 *);
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export_proto(allocate);
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void
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allocate (void **mem, GFC_INTEGER_4 size, GFC_INTEGER_4 * stat)
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{
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if (size < 0)
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{
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runtime_error ("Attempt to allocate negative amount of memory. "
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"Possible integer overflow");
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abort ();
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}
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allocate_size (mem, (size_t) size, stat);
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}
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extern void allocate64 (void **, GFC_INTEGER_8, GFC_INTEGER_4 *);
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export_proto(allocate64);
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void
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allocate64 (void **mem, GFC_INTEGER_8 size, GFC_INTEGER_4 * stat)
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{
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if (size < 0)
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{
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runtime_error
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("ALLOCATE64: Attempt to allocate negative amount of memory. "
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"Possible integer overflow");
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abort ();
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}
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allocate_size (mem, (size_t) size, stat);
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}
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/* Function to call in an ALLOCATE statement when the argument is an
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allocatable array. If the array is currently allocated, it is
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an error to allocate it again. 32-bit version. */
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extern void allocate_array (void **, GFC_INTEGER_4, GFC_INTEGER_4 *);
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export_proto(allocate_array);
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void
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allocate_array (void **mem, GFC_INTEGER_4 size, GFC_INTEGER_4 * stat)
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{
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if (*mem == NULL)
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{
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allocate (mem, size, stat);
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return;
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}
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if (stat)
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{
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free (*mem);
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allocate (mem, size, stat);
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*stat = ERROR_ALLOCATION;
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return;
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}
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else
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runtime_error ("Attempting to allocate already allocated array.");
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return;
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}
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/* Function to call in an ALLOCATE statement when the argument is an
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allocatable array. If the array is currently allocated, it is
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an error to allocate it again. 64-bit version. */
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extern void allocate64_array (void **, GFC_INTEGER_8, GFC_INTEGER_4 *);
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export_proto(allocate64_array);
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void
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allocate64_array (void **mem, GFC_INTEGER_8 size, GFC_INTEGER_4 * stat)
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{
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if (*mem == NULL)
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{
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allocate64 (mem, size, stat);
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return;
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}
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if (stat)
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{
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free (*mem);
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allocate (mem, size, stat);
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*stat = ERROR_ALLOCATION;
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return;
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}
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else
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runtime_error ("Attempting to allocate already allocated array.");
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return;
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}
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/* User-deallocate; pointer is NULLified. */
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extern void deallocate (void **, GFC_INTEGER_4 *);
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export_proto(deallocate);
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void
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deallocate (void **mem, GFC_INTEGER_4 * stat)
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{
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if (!mem)
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runtime_error ("Internal: NULL mem pointer in DEALLOCATE.");
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if (!*mem)
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{
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if (stat)
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{
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*stat = 1;
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return;
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}
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else
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{
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runtime_error
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("Internal: Attempt to DEALLOCATE unallocated memory.");
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abort ();
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}
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}
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free (*mem);
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*mem = NULL;
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if (stat)
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*stat = 0;
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}
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