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/*
* Copyright (c) 2015-2017, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \file
* \brief Aligned memory alloc/free.
*/
#ifndef UTIL_ALLOC_H
#define UTIL_ALLOC_H
#include <cassert>
#include <cstddef> // size_t
#include <limits>
#include <memory>
#include <new> // std::bad_alloc
namespace ue2 {
/** \brief 64-byte aligned, zeroed malloc.
*
* Pointers should be freed with \ref aligned_free. If we are unable to
* allocate the requested number of bytes, this function will throw
* std::bad_alloc. */
void *aligned_zmalloc(size_t size);
/** \brief Free a pointer allocated with \ref aligned_zmalloc. */
void aligned_free(void *ptr);
/** \brief Internal use only, used by AlignedAllocator. */
void *aligned_malloc_internal(size_t size, size_t align);
/** \brief Internal use only, used by AlignedAllocator. */
void aligned_free_internal(void *ptr);
/** \brief Aligned allocator class for use with STL containers. Ensures that
* your objects are aligned to N bytes. */
template <class T, std::size_t N>
class AlignedAllocator {
public:
using value_type = T;
AlignedAllocator() noexcept {}
template <class U, std::size_t N2>
AlignedAllocator(const AlignedAllocator<U, N2> &) noexcept {}
template <class U> struct rebind {
using other = AlignedAllocator<U, N>;
};
T *allocate(std::size_t size) const {
size_t alloc_size = size * sizeof(T);
T *ptr = static_cast<T *>(aligned_malloc_internal(alloc_size, N));
if (!ptr) {
throw std::bad_alloc();
}
return ptr;
}
void deallocate(T *x, std::size_t) const noexcept {
aligned_free_internal(x);
}
};
template <class T, class U, std::size_t N, std::size_t N2>
bool operator==(const AlignedAllocator<T, N> &,
const AlignedAllocator<U, N2> &) {
return true;
}
template <class T, class U, std::size_t N, std::size_t N2>
bool operator!=(const AlignedAllocator<T, N> &a,
const AlignedAllocator<U, N2> &b) {
return !(a == b);
}
} // namespace ue2
#endif
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