memory.cpp

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/* Memory allocation routines.

Copyright 1991, 1993, 1994, 2000, 2001, 2002 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The GNU MP Library 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 Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

// do not include windows.h, since it contains some definitions
// which are duplicated here, and confuse the build process
#ifndef _WIN32_WCE
// on win32 desktop windows this is needed.
#define _X86_
#endif

#include <windef.h>   // DWORD, etc.

#include <stdlib.h> /* for malloc, realloc, free */

#define HAVE_MEMSET 1

#include "gmp.h"
#include "gmp-impl.h"

#ifdef _LONG_LONG_LIMB
#define MEMBLOCK_MARKER ((0xdeadbeef << 31) + 0xdeafdeed)
#else
#define MEMBLOCK_MARKER (0xdeafdeed)
#endif

void *	(*__gmp_allocate_func) _PROTO ((size_t)) = __gmp_wince_allocate;
void *	(*__gmp_reallocate_func) _PROTO ((void *, size_t, size_t))
     = __gmp_wince_reallocate;
void	(*__gmp_free_func) _PROTO ((void *, size_t)) = __gmp_wince_free;

void *
__gmp_wince_allocate (size_t size)
{
  void *ret;
#ifdef DEBUG
  size_t req_size = size;
  size += 2 * BYTES_PER_MP_LIMB;
#endif
  ret = malloc (size);
  if (ret==NULL)
  {
    //debug("GNU MP: Cannot allocate memory (size=%u)\n", size);
    abort ();
  }

#ifdef DEBUG
  {
    mp_ptr p = (mp_ptr)ret;
    p++;
    p[-1] = MEMBLOCK_MARKER;
    if (req_size % BYTES_PER_MP_LIMB == 0)
      p[req_size / BYTES_PER_MP_LIMB] = ~(MEMBLOCK_MARKER);
    ret = p;
  }
#endif
  return ret;
}

void *
__gmp_wince_reallocate (void *oldptr, size_t old_size, size_t new_size)
{
  void *ret;

#ifdef DEBUG
  size_t req_size = new_size;

  if (old_size != 0)
    {
      mp_ptr p = (mp_ptr)oldptr;
      if (p[-1] != MEMBLOCK_MARKER)
	{
	  //debug("gmp: (realloc) data clobbered before allocation block\n");
	  abort ();
	}
      if (old_size % BYTES_PER_MP_LIMB == 0)
	if (p[old_size / BYTES_PER_MP_LIMB] != ~(MEMBLOCK_MARKER))
	  {
	    //debug("gmp: (realloc) data clobbered after allocation block\n");
	    abort ();
	  }
      oldptr = p - 1;
    }

  new_size += 2 * BYTES_PER_MP_LIMB;
#endif

  ret = realloc (oldptr, new_size);
  if (ret == 0)
    {
      //debug("GNU MP: Cannot reallocate memory (old_size=%u new_size=%u)\n", old_size, new_size);
      abort ();
    }

#ifdef DEBUG
  {
    mp_ptr p = (mp_ptr)ret;
    p++;
    p[-1] = MEMBLOCK_MARKER;
    if (req_size % BYTES_PER_MP_LIMB == 0)
      p[req_size / BYTES_PER_MP_LIMB] = ~(MEMBLOCK_MARKER);
    ret = p;
  }
#endif
  return ret;
}

void
__gmp_wince_free (void *blk_ptr, size_t blk_size)
{
#ifdef DEBUG
  {
    mp_ptr p = (mp_ptr)blk_ptr;
    if (blk_size != 0)
      {
	if (p[-1] != MEMBLOCK_MARKER)
	  {
	    //debug("gmp: (free) data clobbered before allocation block\n");
	    abort ();
	  }
	if (blk_size % BYTES_PER_MP_LIMB == 0)
	  if (p[blk_size / BYTES_PER_MP_LIMB] != ~(MEMBLOCK_MARKER))
	    {
	      //debug("gmp: (free) data clobbered after allocation block\n");
	      abort ();
	    }
      }
    blk_ptr = p - 1;
  }
#endif

  // make sure memory is erased before releasing it.
  memset(blk_ptr, 0, blk_size);

  free (blk_ptr);
}