48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/memory/aligned_memory.h"
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#include "base/logging.h"
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#if defined(OS_ANDROID) || defined(OS_NACL)
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#include <malloc.h>
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#endif
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namespace base {
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void* AlignedAlloc(size_t size, size_t alignment) {
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DCHECK_GT(size, 0U);
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DCHECK_EQ(alignment & (alignment - 1), 0U);
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DCHECK_EQ(alignment % sizeof(void*), 0U);
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void* ptr = NULL;
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#if defined(COMPILER_MSVC)
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ptr = _aligned_malloc(size, alignment);
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// Both Android and NaCl technically support posix_memalign(), but do not expose
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// it in the current version of the library headers used by Chrome. Luckily,
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// memalign() on both platforms returns pointers which can safely be used with
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// free(), so we can use it instead. Issues filed with each project for docs:
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// http://code.google.com/p/android/issues/detail?id=35391
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// http://code.google.com/p/chromium/issues/detail?id=138579
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#elif defined(OS_ANDROID) || defined(OS_NACL)
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ptr = memalign(alignment, size);
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#else
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if (posix_memalign(&ptr, alignment, size))
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ptr = NULL;
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#endif
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// Since aligned allocations may fail for non-memory related reasons, force a
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// crash if we encounter a failed allocation; maintaining consistent behavior
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// with a normal allocation failure in Chrome.
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if (!ptr) {
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DLOG(ERROR) << "If you crashed here, your aligned allocation is incorrect: "
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<< "size=" << size << ", alignment=" << alignment;
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CHECK(false);
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}
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// Sanity check alignment just to be safe.
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DCHECK_EQ(reinterpret_cast<uintptr_t>(ptr) & (alignment - 1), 0U);
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return ptr;
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}
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} // namespace base
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