| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | /* Layout | ||
| 22 | |||
| 23 | The buffer is laid out thusly: | ||
| 24 | |||
| 25 | base_ begin_ head_ end_ | ||
| 26 | |||
| 27 | |<- reserved ->|<- unused ->|<- acquired ->| | ||
| 28 | */ | ||
| 29 | workspace:: | ||
| 30 | any:: | ||
| 31 | ~any() = default; | ||
| 32 | |||
| 33 | 756 | workspace:: | |
| 34 | 756 | ~workspace() | |
| 35 | { | ||
| 36 |
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756 | if(base_) |
| 37 | { | ||
| 38 | 756 | clear(); | |
| 39 |
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756 | delete[] base_; |
| 40 | } | ||
| 41 | 756 | } | |
| 42 | |||
| 43 | 11 | workspace:: | |
| 44 | workspace( | ||
| 45 | 11 | std::size_t n) | |
| 46 | 11 | : base_(new unsigned char[n]) | |
| 47 | 11 | , begin_(base_) | |
| 48 | 11 | , head_(base_ + n) | |
| 49 | 11 | , end_(head_) | |
| 50 | { | ||
| 51 | 11 | } | |
| 52 | |||
| 53 | ✗ | workspace:: | |
| 54 | workspace( | ||
| 55 | ✗ | workspace&& other) noexcept | |
| 56 | ✗ | : base_(other.base_) | |
| 57 | ✗ | , begin_(other.begin_) | |
| 58 | ✗ | , head_(other.end_) | |
| 59 | ✗ | , end_(other.end_) | |
| 60 | { | ||
| 61 | ✗ | other.base_ = nullptr; | |
| 62 | ✗ | other.begin_ = nullptr; | |
| 63 | ✗ | other.head_ = nullptr; | |
| 64 | ✗ | other.end_ = nullptr; | |
| 65 | } | ||
| 66 | |||
| 67 | void | ||
| 68 | 745 | workspace:: | |
| 69 | allocate( | ||
| 70 | std::size_t n) | ||
| 71 | { | ||
| 72 | // n == 0 | ||
| 73 |
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745 | if(n == 0) |
| 74 | ✗ | detail::throw_invalid_argument(); | |
| 75 | |||
| 76 | // this->size() > 0 | ||
| 77 |
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745 | if(base_ != nullptr) |
| 78 | ✗ | detail::throw_logic_error(); | |
| 79 | |||
| 80 | 745 | base_ = new unsigned char[n]; | |
| 81 | 745 | begin_ = base_; | |
| 82 | 745 | head_ = base_ + n; | |
| 83 | 745 | end_ = head_; | |
| 84 | 745 | } | |
| 85 | |||
| 86 | void | ||
| 87 | 1543 | workspace:: | |
| 88 | clear() noexcept | ||
| 89 | { | ||
| 90 |
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1543 | BOOST_ASSERT(begin_); |
| 91 | |||
| 92 | 1543 | auto const end = | |
| 93 | reinterpret_cast< | ||
| 94 | any const*>(end_); | ||
| 95 | 1543 | auto p = | |
| 96 | reinterpret_cast< | ||
| 97 | any const*>(head_); | ||
| 98 |
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1580 | while(p != end) |
| 99 | { | ||
| 100 | 37 | auto next = p->next; | |
| 101 | 37 | p->~any(); | |
| 102 | 37 | p = next; | |
| 103 | } | ||
| 104 | 1543 | head_ = end_; | |
| 105 | 1543 | begin_ = base_; | |
| 106 | 1543 | } | |
| 107 | |||
| 108 | void | ||
| 109 | 6 | workspace:: | |
| 110 | reserve(std::size_t n) | ||
| 111 | { | ||
| 112 | // Requested size exceeds available space. | ||
| 113 | // Note you can never reserve the last byte. | ||
| 114 |
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6 | if(n >= size()) |
| 115 | ✗ | detail::throw_length_error(); | |
| 116 | |||
| 117 | 6 | base_ += n ; | |
| 118 | 6 | } | |
| 119 | |||
| 120 | // https://fitzgeraldnick.com/2019/11/01/always-bump-downwards.html | ||
| 121 | void* | ||
| 122 | 37 | workspace:: | |
| 123 | bump_down( | ||
| 124 | std::size_t size, | ||
| 125 | std::size_t align) | ||
| 126 | { | ||
| 127 |
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37 | BOOST_ASSERT(align > 0); |
| 128 |
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37 | BOOST_ASSERT( |
| 129 | (align & (align - 1)) == 0); | ||
| 130 |
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37 | BOOST_ASSERT(begin_); |
| 131 | |||
| 132 | 37 | auto ip0 = reinterpret_cast< | |
| 133 | 37 | std::uintptr_t>(begin_); | |
| 134 | 37 | auto ip = reinterpret_cast< | |
| 135 | 37 | std::uintptr_t>(head_); | |
| 136 | |||
| 137 | // If you get an exception here, it | ||
| 138 | // means that a buffer was too small | ||
| 139 | // for your workload. Increase the | ||
| 140 | // buffer size. | ||
| 141 |
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37 | if(size > ip - ip0) |
| 142 | ✗ | detail::throw_bad_alloc(); | |
| 143 | |||
| 144 | 37 | ip -= size; | |
| 145 | 37 | ip &= ~(align - 1); | |
| 146 | |||
| 147 | // If you get an exception here, it | ||
| 148 | // means that a buffer was too small | ||
| 149 | // for your workload. Increase the | ||
| 150 | // buffer size. | ||
| 151 |
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37 | if(ip < ip0) |
| 152 | ✗ | detail::throw_bad_alloc(); | |
| 153 | |||
| 154 | 37 | return reinterpret_cast<void*>(ip); | |
| 155 | } | ||
| 156 | |||
| 157 | } // detail | ||
| 158 | } // http_proto | ||
| 159 | } // boost | ||
| 160 | |||
| 161 | #endif | ||
| 162 |