1/* Copyright (C) 2004 Free Software Foundation, Inc.
2
3   This file is part of GCC.
4
5   GCC is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 2, or (at your option)
8   any later version.
9
10   GCC is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with GCC; see the file COPYING.  If not, write to
17   the Free Software Foundation, 51 Franklin Street, Fifth Floor,
18   Boston, MA 02110-1301, USA.  */
19
20/* As a special exception, if you include this header file into source
21   files compiled by GCC, this header file does not by itself cause
22   the resulting executable to be covered by the GNU General Public
23   License.  This exception does not however invalidate any other
24   reasons why the executable file might be covered by the GNU General
25   Public License.  */
26
27#ifndef _MM_MALLOC_H_INCLUDED
28#define _MM_MALLOC_H_INCLUDED
29
30#include <stdlib.h>
31#include <errno.h>
32
33static __inline__ void*
34_mm_malloc (size_t size, size_t align)
35{
36  void * malloc_ptr;
37  void * aligned_ptr;
38
39  /* Error if align is not a power of two.  */
40  if (align & (align - 1))
41    {
42      errno = EINVAL;
43      return ((void*) 0);
44    }
45
46  if (size == 0)
47    return ((void *) 0);
48
49 /* Assume malloc'd pointer is aligned at least to sizeof (void*).
50    If necessary, add another sizeof (void*) to store the value
51    returned by malloc. Effectively this enforces a minimum alignment
52    of sizeof double. */
53    if (align < 2 * sizeof (void *))
54      align = 2 * sizeof (void *);
55
56  malloc_ptr = malloc (size + align);
57  if (!malloc_ptr)
58    return ((void *) 0);
59
60  /* Align  We have at least sizeof (void *) space below malloc'd ptr. */
61  aligned_ptr = (void *) (((size_t) malloc_ptr + align)
62			  & ~((size_t) (align) - 1));
63
64  /* Store the original pointer just before p.  */
65  ((void **) aligned_ptr) [-1] = malloc_ptr;
66
67  return aligned_ptr;
68}
69
70static __inline__ void
71_mm_free (void * aligned_ptr)
72{
73  if (aligned_ptr)
74    free (((void **) aligned_ptr) [-1]);
75}
76
77#endif /* _MM_MALLOC_H_INCLUDED */
78