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 9 #if defined(OS_ANDROID) || defined(OS_NACL) 10 #include <malloc.h> 11 #endif 12 13 namespace base { 14 15 void* AlignedAlloc(size_t size, size_t alignment) { 16 DCHECK_GT(size, 0U); 17 DCHECK_EQ(alignment & (alignment - 1), 0U); 18 DCHECK_EQ(alignment % sizeof(void*), 0U); 19 void* ptr = NULL; 20 #if defined(COMPILER_MSVC) 21 ptr = _aligned_malloc(size, alignment); 22 // Both Android and NaCl technically support posix_memalign(), but do not expose 23 // it in the current version of the library headers used by Chrome. Luckily, 24 // memalign() on both platforms returns pointers which can safely be used with 25 // free(), so we can use it instead. Issues filed with each project for docs: 26 // http://code.google.com/p/android/issues/detail?id=35391 27 // http://code.google.com/p/chromium/issues/detail?id=138579 28 #elif defined(OS_ANDROID) || defined(OS_NACL) 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
