mm_malloc.h revision 218893 
1/*===---- mm_malloc.h - Allocating and Freeing Aligned Memory Blocks -------===
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to deal
5 * in the Software without restriction, including without limitation the rights
6 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7 * copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
19 * THE SOFTWARE.
20 *
21 *===-----------------------------------------------------------------------===
22 */
23
24#ifndef __MM_MALLOC_H
25#define __MM_MALLOC_H
26
27#include <stdlib.h>
28
29#ifdef _WIN32
30#include <malloc.h>
31#else
32#ifndef __cplusplus
33extern int posix_memalign(void **memptr, size_t alignment, size_t size);
34#else
35// Some systems (e.g. those with GNU libc) declare posix_memalign with an
36// exception specifier. Via an "egregious workaround" in
37// Sema::CheckEquivalentExceptionSpec, Clang accepts the following as a valid
38// redeclaration of glibc's declaration.
39extern "C" int posix_memalign(void **memptr, size_t alignment, size_t size);
40#endif
41#endif
42
43static __inline__ void *__attribute__((__always_inline__, __nodebug__,
44                                       __malloc__))
45_mm_malloc(size_t size, size_t align)
46{
47  if (align == 1) {
48    return malloc(size);
49  }
50
51  if (!(align & (align - 1)) && align < sizeof(void *))
52    align = sizeof(void *);
53
54  void *mallocedMemory;
55#ifdef _WIN32
56  mallocedMemory = _aligned_malloc(size, align);
57#else
58  if (posix_memalign(&mallocedMemory, align, size))
59    return 0;
60#endif
61
62  return mallocedMemory;
63}
64
65static __inline__ void __attribute__((__always_inline__, __nodebug__))
66_mm_free(void *p)
67{
68  free(p);
69}
70
71#endif /* __MM_MALLOC_H */
72