GCC Code Coverage Report

Directory: libs/http_proto/
File: boost/http_proto/detail/impl/workspace.hpp
Date: 2024-03-22 16:56:24
Exec Total Coverage
Lines: 47 48 97.9%
Functions: 25 25 100.0%
Branches: 7 10 70.0%
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_HPP
11 #define BOOST_HTTP_PROTO_DETAIL_IMPL_WORKSPACE_HPP
12
13 #include <boost/config.hpp>
14
15 namespace boost {
16 namespace http_proto {
17 namespace detail {
18
19 #if defined(BOOST_MSVC)
20 #pragma warning(push)
21 #pragma warning(disable : 4324) /* structure was padded due to __declspec(align()) */
22 #endif
23
24 680 struct workspace::any
25 {
26 any* next = nullptr;
27
28 BOOST_HTTP_PROTO_DECL
29 virtual ~any() = 0;
30 };
31
32 template<class U>
33 struct alignas(alignof(::max_align_t))
34 workspace::any_impl : any
35 {
36 U u;
37
38 any_impl() = delete;
39 any_impl(any_impl const&) = delete;
40 any_impl(any_impl&&) = delete;
41
42 template<class... Args>
43 628 explicit any_impl(Args&&... args)
44 628 : u(std::forward<Args>(args)...)
45 {
46 628 }
47 };
48
49 struct workspace::undo
50 {
51 explicit
52 340 undo(workspace& ws0) noexcept
53 340 : ws_(ws0)
54 340 , head_(ws0.head_)
55 {
56 340 }
57
58 340 ~undo()
59 340 {
60
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 340 if(head_)
61 ✗ ws_.head_ = head_;
62 340 }
63
64 void
65 340 commit() noexcept
66 {
67 340 head_ = nullptr;
68 340 }
69
70 private:
71 workspace& ws_;
72 unsigned char* head_;
73 };
74
75 template<class T>
76 constexpr
77 std::size_t
78 workspace::
79 space_needed()
80 {
81 using U = typename std::decay<T>::type;
82
83 static_assert(
84 alignof(U) <= alignof(::max_align_t),
85 "Overaligned types not supported");
86
87 return sizeof(any_impl<U>);
88 }
89
90 template<class T, class... Args>
91 auto
92 329 workspace::
93 emplace(Args&&... args) ->
94 typename std::decay<T>::type&
95 {
96 static_assert(
97 alignof(T) <= alignof(::max_align_t),
98 "Overaligned types not supported");
99
100 using U = any_impl<typename
101 std::decay<T>::type>;
102
103 329 undo u(*this);
104
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 329 auto p = ::new(bump_down(
105 sizeof(U), alignof(U))) U(
106 329 std::forward<Args>(args)...);
107 329 u.commit();
108 329 p->next = reinterpret_cast<
109 329 any*>(head_);
110 329 head_ = reinterpret_cast<
111 unsigned char*>(p);
112 658 return p->u;
113 }
114
115 template<class T>
116 T*
117 26 workspace::
118 push_array(
119 std::size_t n,
120 T const& t)
121 {
122 struct alignas(alignof(::max_align_t))
123 26 U : any
124 {
125 std::size_t n_ = 0;
126
127 U() = default;
128 52 ~U()
129 {
130 156 for(std::size_t i = n_;
131
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 156 i-- > 0;)
132 104 data()[i].~T();
133 104 }
134
135 26 U( std::size_t n,
136 T const& t)
137 26 : U()
138 {
139
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 78 while(n_ < n)
140 {
141 52 new(&data()[n_]) T(t);
142 52 ++n_;
143 }
144 26 }
145
146 130 T* data() noexcept
147 {
148 return reinterpret_cast<
149 130 T*>(this + 1);
150 }
151 };
152
153 52 undo u(*this);
154 26 auto p = ::new(bump_down(
155
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 26 sizeof(U) + n * sizeof(T),
156 alignof(::max_align_t))) U(n, t);
157 26 u.commit();
158 26 p->next = reinterpret_cast<
159 26 any*>(head_);
160 26 head_ = reinterpret_cast<
161 unsigned char*>(p);
162 52 return p->data();
163 }
164
165 #if defined(BOOST_MSVC)
166 #pragma warning(pop) /* C4324 */
167 #endif
168
169 } // detail
170 } // http_proto
171 } // boost
172
173 #endif
174