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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/CPPAlliance/http_proto | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_HTTP_PROTO_DETAIL_IMPL_WORKSPACE_IPP | ||
| 11 | #define BOOST_HTTP_PROTO_DETAIL_IMPL_WORKSPACE_IPP | ||
| 12 | |||
| 13 | #include <boost/http_proto/detail/workspace.hpp> | ||
| 14 | #include <boost/http_proto/detail/except.hpp> | ||
| 15 | #include <boost/assert.hpp> | ||
| 16 | |||
| 17 | namespace boost { | ||
| 18 | namespace http_proto { | ||
| 19 | namespace detail { | ||
| 20 | |||
| 21 | workspace:: | ||
| 22 | any:: | ||
| 23 | ~any() = default; | ||
| 24 | |||
| 25 | 1501 | workspace:: | |
| 26 | 1501 | ~workspace() | |
| 27 | { | ||
| 28 |
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1501 | if(begin_) |
| 29 | { | ||
| 30 | 756 | clear(); | |
| 31 |
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756 | delete[] begin_; |
| 32 | } | ||
| 33 | 1501 | } | |
| 34 | |||
| 35 | 756 | workspace:: | |
| 36 | workspace( | ||
| 37 | 756 | std::size_t n) | |
| 38 | 756 | : begin_(new unsigned char[n]) | |
| 39 | 756 | , end_(begin_ + n) | |
| 40 | 756 | , head_(end_) | |
| 41 | { | ||
| 42 | 756 | } | |
| 43 | |||
| 44 | ✗ | workspace:: | |
| 45 | workspace( | ||
| 46 | ✗ | workspace&& other) noexcept | |
| 47 | ✗ | : begin_(other.begin_) | |
| 48 | ✗ | , end_(other.end_) | |
| 49 | ✗ | , head_(end_) | |
| 50 | { | ||
| 51 | ✗ | other.begin_ = nullptr; | |
| 52 | } | ||
| 53 | |||
| 54 | workspace& | ||
| 55 | 745 | workspace:: | |
| 56 | operator=( | ||
| 57 | workspace&& other) noexcept | ||
| 58 | { | ||
| 59 | // *this is not empty | ||
| 60 |
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745 | if(begin_ != nullptr) |
| 61 | ✗ | detail::throw_length_error(); | |
| 62 | |||
| 63 | 745 | begin_ = other.begin_; | |
| 64 | 745 | end_ = other.end_; | |
| 65 | 745 | head_ = end_; | |
| 66 | 745 | other.begin_ = nullptr; | |
| 67 | 745 | return *this; | |
| 68 | } | ||
| 69 | |||
| 70 | void | ||
| 71 | 1543 | workspace:: | |
| 72 | clear() noexcept | ||
| 73 | { | ||
| 74 |
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1543 | BOOST_ASSERT(begin_); |
| 75 | 1543 | auto const end = | |
| 76 | reinterpret_cast< | ||
| 77 | any const*>(end_); | ||
| 78 | 1543 | auto p = | |
| 79 | reinterpret_cast< | ||
| 80 | any const*>(head_); | ||
| 81 |
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1580 | while(p != end) |
| 82 | { | ||
| 83 | 37 | auto next = p->next; | |
| 84 | 37 | p->~any(); | |
| 85 | 37 | p = next; | |
| 86 | } | ||
| 87 | 1543 | head_ = end_; | |
| 88 | 1543 | } | |
| 89 | |||
| 90 | void* | ||
| 91 | ✗ | workspace:: | |
| 92 | reserve(std::size_t n) | ||
| 93 | { | ||
| 94 | ✗ | BOOST_ASSERT(begin_); | |
| 95 | |||
| 96 | // Requested size exceeds available space. | ||
| 97 | ✗ | if(n > size()) | |
| 98 | ✗ | detail::throw_length_error(); | |
| 99 | |||
| 100 | struct empty : any | ||
| 101 | { | ||
| 102 | }; | ||
| 103 | |||
| 104 | using U = empty; | ||
| 105 | ✗ | auto p = ::new(bump_down( | |
| 106 | sizeof(U) + n, alignof( | ||
| 107 | ✗ | ::max_align_t))) U; | |
| 108 | ✗ | p->next = reinterpret_cast< | |
| 109 | ✗ | any*>(head_); | |
| 110 | ✗ | head_ = reinterpret_cast< | |
| 111 | unsigned char*>(p); | ||
| 112 | ✗ | return p + 1; | |
| 113 | } | ||
| 114 | |||
| 115 | // https://fitzgeraldnick.com/2019/11/01/always-bump-downwards.html | ||
| 116 | void* | ||
| 117 | 37 | workspace:: | |
| 118 | bump_down( | ||
| 119 | std::size_t size, | ||
| 120 | std::size_t align) | ||
| 121 | { | ||
| 122 |
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37 | BOOST_ASSERT(align > 0); |
| 123 |
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37 | BOOST_ASSERT( |
| 124 | (align & (align - 1)) == 0); | ||
| 125 |
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37 | BOOST_ASSERT(begin_); |
| 126 | |||
| 127 | 37 | auto ip0 = reinterpret_cast< | |
| 128 | 37 | std::uintptr_t>(begin_); | |
| 129 | 37 | auto ip = reinterpret_cast< | |
| 130 | 37 | std::uintptr_t>(head_); | |
| 131 | |||
| 132 | // If you get an exception here, it | ||
| 133 | // means that a buffer was too small | ||
| 134 | // for your workload. Increase the | ||
| 135 | // buffer size. | ||
| 136 |
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37 | if(size > ip - ip0) |
| 137 | ✗ | detail::throw_bad_alloc(); | |
| 138 | |||
| 139 | 37 | ip -= size; | |
| 140 | 37 | ip &= ~(align - 1); | |
| 141 | |||
| 142 | // If you get an exception here, it | ||
| 143 | // means that a buffer was too small | ||
| 144 | // for your workload. Increase the | ||
| 145 | // buffer size. | ||
| 146 |
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37 | if(ip < ip0) |
| 147 | ✗ | detail::throw_bad_alloc(); | |
| 148 | |||
| 149 | 37 | return reinterpret_cast<void*>(ip); | |
| 150 | } | ||
| 151 | |||
| 152 | } // detail | ||
| 153 | } // http_proto | ||
| 154 | } // boost | ||
| 155 | |||
| 156 | #endif | ||
| 157 |