| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/memory/aligned_memory.h" |
| |
| #include "base/logging.h" |
| #include "build/build_config.h" |
| |
| #if defined(OS_ANDROID) |
| #include <malloc.h> |
| #endif |
| |
| namespace base { |
| |
| void* AlignedAlloc(size_t size, size_t alignment) { |
| DCHECK_GT(size, 0U); |
| DCHECK(bits::IsPowerOfTwo(alignment)); |
| DCHECK_EQ(alignment % sizeof(void*), 0U); |
| void* ptr = nullptr; |
| #if defined(COMPILER_MSVC) |
| ptr = _aligned_malloc(size, alignment); |
| #elif defined(OS_ANDROID) |
| // Android technically supports posix_memalign(), but does not expose it in |
| // the current version of the library headers used by Chromium. Luckily, |
| // memalign() on Android returns pointers which can safely be used with |
| // free(), so we can use it instead. Issue filed to document this: |
| // http://code.google.com/p/android/issues/detail?id=35391 |
| ptr = memalign(alignment, size); |
| #else |
| int ret = posix_memalign(&ptr, alignment, size); |
| if (ret != 0) { |
| DLOG(ERROR) << "posix_memalign() returned with error " << ret; |
| ptr = nullptr; |
| } |
| #endif |
| |
| // Since aligned allocations may fail for non-memory related reasons, force a |
| // crash if we encounter a failed allocation; maintaining consistent behavior |
| // with a normal allocation failure in Chrome. |
| if (!ptr) { |
| DLOG(ERROR) << "If you crashed here, your aligned allocation is incorrect: " |
| << "size=" << size << ", alignment=" << alignment; |
| CHECK(false); |
| } |
| // Sanity check alignment just to be safe. |
| DCHECK(IsAligned(ptr, alignment)); |
| return ptr; |
| } |
| |
| } // namespace base |