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