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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #include "base/memory/aligned_memory.h"
6 
7 #include "base/logging.h"
8 #include "build/build_config.h"
9 
10 #if defined(OS_ANDROID)
11 #include <malloc.h>
12 #endif
13 
14 namespace base {
15 
AlignedAlloc(size_t size,size_t alignment)16 void* AlignedAlloc(size_t size, size_t alignment) {
17   DCHECK_GT(size, 0U);
18   DCHECK_EQ(alignment & (alignment - 1), 0U);
19   DCHECK_EQ(alignment % sizeof(void*), 0U);
20   void* ptr = NULL;
21 #if defined(COMPILER_MSVC)
22   ptr = _aligned_malloc(size, alignment);
23 // Android technically supports posix_memalign(), but does not expose it in
24 // the current version of the library headers used by Chrome.  Luckily,
25 // memalign() on Android returns pointers which can safely be used with
26 // free(), so we can use it instead.  Issue filed to document this:
27 // http://code.google.com/p/android/issues/detail?id=35391
28 #elif defined(OS_ANDROID)
29   ptr = memalign(alignment, size);
30 #else
31   if (posix_memalign(&ptr, alignment, size))
32     ptr = NULL;
33 #endif
34   // Since aligned allocations may fail for non-memory related reasons, force a
35   // crash if we encounter a failed allocation; maintaining consistent behavior
36   // with a normal allocation failure in Chrome.
37   if (!ptr) {
38     DLOG(ERROR) << "If you crashed here, your aligned allocation is incorrect: "
39                 << "size=" << size << ", alignment=" << alignment;
40     CHECK(false);
41   }
42   // Sanity check alignment just to be safe.
43   DCHECK_EQ(reinterpret_cast<uintptr_t>(ptr) & (alignment - 1), 0U);
44   return ptr;
45 }
46 
47 }  // namespace base
48