113 lines
3.9 KiB
C++
113 lines
3.9 KiB
C++
/*
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Copyright (c) 2008-2016, Arvid Norberg
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All rights reserved.
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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
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are met:
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* Redistributions of source code must retain the above copyright
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notice, 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
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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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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#ifndef TORRENT_ALLOCA_HPP_INCLUDED
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#define TORRENT_ALLOCA_HPP_INCLUDED
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#include "libtorrent/config.hpp"
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#include "libtorrent/span.hpp"
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#include "libtorrent/aux_/numeric_cast.hpp"
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#include <iterator> // for iterator_traits
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#include <memory> // for addressof
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namespace libtorrent { namespace aux {
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template<class ForwardIt>
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inline void uninitialized_default_construct(ForwardIt first, ForwardIt last)
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{
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using Value = typename std::iterator_traits<ForwardIt>::value_type;
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ForwardIt current = first;
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try {
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for (; current != last; ++current) {
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::new (static_cast<void*>(std::addressof(*current))) Value;
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}
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} catch (...) {
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for (; first != current; ++first) {
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first->~Value();
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}
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throw;
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}
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}
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template <typename T>
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struct alloca_destructor
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{
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span<T> objects;
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~alloca_destructor()
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{
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for (auto& o : objects)
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{
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TORRENT_UNUSED(o);
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o.~T();
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}
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}
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};
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}}
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#if defined TORRENT_WINDOWS || defined TORRENT_MINGW
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#include <malloc.h>
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#define TORRENT_ALLOCA(v, t, n) ::libtorrent::span<t> v; { \
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auto TORRENT_ALLOCA_size = ::libtorrent::aux::numeric_cast<std::ptrdiff_t>(n); \
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auto* TORRENT_ALLOCA_tmp = static_cast<t*>(_alloca(sizeof(t) * static_cast<std::size_t>(TORRENT_ALLOCA_size))); \
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v = ::libtorrent::span<t>(TORRENT_ALLOCA_tmp, TORRENT_ALLOCA_size); \
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::libtorrent::aux::uninitialized_default_construct(v.begin(), v.end()); \
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} \
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::libtorrent::aux::alloca_destructor<t> v##_destructor{v};
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#elif defined TORRENT_BSD
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#include <stdlib.h>
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#define TORRENT_ALLOCA(v, t, n) ::libtorrent::span<t> v; { \
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auto TORRENT_ALLOCA_size = ::libtorrent::aux::numeric_cast<std::ptrdiff_t>(n); \
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auto* TORRENT_ALLOCA_tmp = static_cast<t*>(alloca(sizeof(t) * static_cast<std::size_t>(TORRENT_ALLOCA_size))); \
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v = ::libtorrent::span<t>(TORRENT_ALLOCA_tmp, TORRENT_ALLOCA_size); \
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::libtorrent::aux::uninitialized_default_construct(v.begin(), v.end()); \
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} \
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::libtorrent::aux::alloca_destructor<t> v##_destructor{v};
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#else
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#include <alloca.h>
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#define TORRENT_ALLOCA(v, t, n) ::libtorrent::span<t> v; { \
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auto TORRENT_ALLOCA_size = ::libtorrent::aux::numeric_cast<std::ptrdiff_t>(n); \
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auto* TORRENT_ALLOCA_tmp = static_cast<t*>(alloca(sizeof(t) * static_cast<std::size_t>(TORRENT_ALLOCA_size))); \
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v = ::libtorrent::span<t>(TORRENT_ALLOCA_tmp, TORRENT_ALLOCA_size); \
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::libtorrent::aux::uninitialized_default_construct(v.begin(), v.end()); \
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} \
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::libtorrent::aux::alloca_destructor<t> v##_destructor{v};
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#endif
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#endif // TORRENT_ALLOCA_HPP_INCLUDED
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