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//
// Copyright 2017 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// aligned_memory: An aligned memory allocator. Based on Chrome's base/memory/aligned_memory.
//
#include "common/aligned_memory.h"
#include "common/debug.h"
#include "common/platform.h"
#if defined(COMPILER_MSVC)
# include <malloc.h>
#else
# include <stdlib.h>
#endif
namespace angle
{
void *AlignedAlloc(size_t size, size_t alignment)
{
ASSERT(size > 0);
ASSERT((alignment & (alignment - 1)) == 0);
ASSERT((alignment % sizeof(void *)) == 0);
void *ptr = nullptr;
#if defined(ANGLE_PLATFORM_WINDOWS)
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(ANGLE_PLATFORM_ANDROID)
ptr = memalign(alignment, size);
#else
if (posix_memalign(&ptr, alignment, size))
ptr = nullptr;
#endif
// Since aligned allocations may fail for non-memory related reasons, force a
// crash if we encounter a failed allocation.
if (!ptr)
{
ERR() << "If you crashed here, your aligned allocation is incorrect: "
<< "size=" << size << ", alignment=" << alignment;
ASSERT(false);
}
// Confidence check alignment just to be safe.
ASSERT((reinterpret_cast<uintptr_t>(ptr) & (alignment - 1)) == 0);
return ptr;
}
void AlignedFree(void *ptr)
{
#if defined(ANGLE_PLATFORM_WINDOWS)
_aligned_free(ptr);
#else
free(ptr);
#endif
}
} // namespace angle
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