// 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 #endif namespace base { void* AlignedAlloc(size_t size, size_t alignment) { DCHECK_GT(size, 0U); DCHECK_EQ(alignment & (alignment - 1), 0U); DCHECK_EQ(alignment % sizeof(void*), 0U); void* ptr = nullptr; #if defined(COMPILER_MSVC) ptr = _aligned_malloc(size, alignment); // Android technically supports posix_memalign(), but does not expose it in // the current version of the library headers used by Chrome. 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 #elif defined(OS_ANDROID) ptr = memalign(alignment, size); #else if (int ret = posix_memalign(&ptr, alignment, size)) { 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_EQ(reinterpret_cast(ptr) & (alignment - 1), 0U); return ptr; } } // namespace base