blob: 526a49587a4fc21019f1fa63c0dafd2893036f1c [file] [log] [blame]
// 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>
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 = NULL;
#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:
#elif defined(OS_ANDROID)
ptr = memalign(alignment, size);
if (posix_memalign(&ptr, alignment, size))
ptr = NULL;
// 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;
// Sanity check alignment just to be safe.
DCHECK_EQ(reinterpret_cast<uintptr_t>(ptr) & (alignment - 1), 0U);
return ptr;
} // namespace base