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detail/config.hpp

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config.hpp
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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/boostorg/json
8 //
9
10 #ifndef BOOST_JSON_DETAIL_CONFIG_HPP
11 #define BOOST_JSON_DETAIL_CONFIG_HPP
12
13 #include <boost/config.hpp>
14 #include <boost/config/pragma_message.hpp>
15 #include <boost/assert.hpp>
16 #include <boost/throw_exception.hpp>
17 #include <cstdint>
18 #include <type_traits>
19 #include <utility>
20
21 // detect 32/64 bit
22 #if UINTPTR_MAX == UINT64_MAX
23 # define BOOST_JSON_ARCH 64
24 #elif UINTPTR_MAX == UINT32_MAX
25 # define BOOST_JSON_ARCH 32
26 #else
27 # error Unknown or unsupported architecture, please open an issue
28 #endif
29
30 #ifndef BOOST_JSON_REQUIRE_CONST_INIT
31 # define BOOST_JSON_REQUIRE_CONST_INIT
32 # if __cpp_constinit >= 201907L
33 # undef BOOST_JSON_REQUIRE_CONST_INIT
34 # define BOOST_JSON_REQUIRE_CONST_INIT constinit
35 # elif defined(__clang__) && defined(__has_cpp_attribute)
36 # if __has_cpp_attribute(clang::require_constant_initialization)
37 # undef BOOST_JSON_REQUIRE_CONST_INIT
38 # define BOOST_JSON_REQUIRE_CONST_INIT [[clang::require_constant_initialization]]
39 # endif
40 # endif
41 #endif
42
43 #ifndef BOOST_JSON_NO_ATTRIBUTE_NO_DESTROY
44 # if defined(__clang__) && defined(__has_cpp_attribute)
45 # if __has_cpp_attribute(clang::no_destroy)
46 # define BOOST_JSON_ATTRIBUTE_NO_DESTROY [[clang::no_destroy]]
47 # else
48 # define BOOST_JSON_NO_ATTRIBUTE_NO_DESTROY
49 # endif
50 # else
51 # define BOOST_JSON_NO_ATTRIBUTE_NO_DESTROY
52 # endif
53 #endif
54
55 #if ! defined(BOOST_JSON_NO_SSE2) && \
56 ! defined(BOOST_JSON_USE_SSE2)
57 # if (defined(_M_IX86) && _M_IX86_FP == 2) || \
58 defined(_M_X64) || defined(__SSE2__)
59 # define BOOST_JSON_USE_SSE2
60 # endif
61 #endif
62
63 #if defined(BOOST_JSON_DOCS)
64 # define BOOST_JSON_DECL
65 #else
66 # if (defined(BOOST_JSON_DYN_LINK) || defined(BOOST_ALL_DYN_LINK)) && !defined(BOOST_JSON_STATIC_LINK)
67 # if defined(BOOST_JSON_SOURCE)
68 # define BOOST_JSON_DECL BOOST_SYMBOL_EXPORT
69 # else
70 # define BOOST_JSON_DECL BOOST_SYMBOL_IMPORT
71 # endif
72 # endif // shared lib
73 # ifndef BOOST_JSON_DECL
74 # define BOOST_JSON_DECL
75 # endif
76 # if !defined(BOOST_JSON_SOURCE) && !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_JSON_NO_LIB)
77 # define BOOST_LIB_NAME boost_json
78 # if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_JSON_DYN_LINK)
79 # define BOOST_DYN_LINK
80 # endif
81 # include <boost/config/auto_link.hpp>
82 # endif
83 #endif
84
85 #ifndef BOOST_JSON_LIKELY
86 # define BOOST_JSON_LIKELY(x) BOOST_LIKELY( !!(x) )
87 #endif
88
89 #ifndef BOOST_JSON_UNLIKELY
90 # define BOOST_JSON_UNLIKELY(x) BOOST_UNLIKELY( !!(x) )
91 #endif
92
93 #ifndef BOOST_JSON_UNREACHABLE
94 # ifdef _MSC_VER
95 # define BOOST_JSON_UNREACHABLE() __assume(0)
96 # elif defined(__GNUC__) || defined(__clang__)
97 # define BOOST_JSON_UNREACHABLE() __builtin_unreachable()
98 # elif defined(__has_builtin)
99 # if __has_builtin(__builtin_unreachable)
100 # define BOOST_JSON_UNREACHABLE() __builtin_unreachable()
101 # endif
102 # else
103 # define BOOST_JSON_UNREACHABLE() static_cast<void>(0)
104 # endif
105 #endif
106
107 #ifndef BOOST_JSON_ASSUME
108 # define BOOST_JSON_ASSUME(x) (!!(x) ? void() : BOOST_JSON_UNREACHABLE())
109 # ifdef _MSC_VER
110 # undef BOOST_JSON_ASSUME
111 # define BOOST_JSON_ASSUME(x) __assume(!!(x))
112 # elif defined(__has_builtin)
113 # if __has_builtin(__builtin_assume)
114 # undef BOOST_JSON_ASSUME
115 # define BOOST_JSON_ASSUME(x) __builtin_assume(!!(x))
116 # endif
117 # endif
118 #endif
119
120 // older versions of msvc and clang don't always
121 // constant initialize when they are supposed to
122 #ifndef BOOST_JSON_WEAK_CONSTINIT
123 # if defined(_MSC_VER) && ! defined(__clang__) && _MSC_VER < 1920
124 # define BOOST_JSON_WEAK_CONSTINIT
125 # elif defined(__clang__) && __clang_major__ < 4
126 # define BOOST_JSON_WEAK_CONSTINIT
127 # endif
128 #endif
129
130 // These macros are private, for tests, do not change
131 // them or else previously built libraries won't match.
132 #ifndef BOOST_JSON_MAX_STRING_SIZE
133 # define BOOST_JSON_NO_MAX_STRING_SIZE
134 # define BOOST_JSON_MAX_STRING_SIZE 0x7ffffffe
135 #endif
136 #ifndef BOOST_JSON_MAX_STRUCTURED_SIZE
137 # define BOOST_JSON_NO_MAX_STRUCTURED_SIZE
138 # define BOOST_JSON_MAX_STRUCTURED_SIZE 0x7ffffffe
139 #endif
140 #ifndef BOOST_JSON_STACK_BUFFER_SIZE
141 # define BOOST_JSON_NO_STACK_BUFFER_SIZE
142 # if defined(__i386__) || defined(__x86_64__) || \
143 defined(_M_IX86) || defined(_M_X64)
144 # define BOOST_JSON_STACK_BUFFER_SIZE 4096
145 # else
146 // If we are not on Intel, then assume we are on
147 // embedded and use a smaller stack size. If this
148 // is not suitable, the user can define the macro
149 // themselves when building the library or including
150 // src.hpp.
151 # define BOOST_JSON_STACK_BUFFER_SIZE 256
152 # endif
153 #endif
154
155 #if defined(__cpp_constinit) && __cpp_constinit >= 201907L
156 # define BOOST_JSON_CONSTINIT constinit
157 #elif defined(__has_cpp_attribute) && defined(__clang__)
158 # if __has_cpp_attribute(clang::require_constant_initialization)
159 # define BOOST_JSON_CONSTINIT [[clang::require_constant_initialization]]
160 # endif
161 #elif defined(__GNUC__) && (__GNUC__ >= 10)
162 # define BOOST_JSON_CONSTINIT __constinit
163 #endif
164 #ifndef BOOST_JSON_CONSTINIT
165 # define BOOST_JSON_CONSTINIT
166 #endif
167
168 namespace boost {
169 namespace json {
170 namespace detail {
171
172 template<class...>
173 struct make_void
174 {
175 using type =void;
176 };
177
178 template<class... Ts>
179 using void_t = typename
180 make_void<Ts...>::type;
181
182 template<class T>
183 using remove_cvref = typename
184 std::remove_cv<typename
185 std::remove_reference<T>::type>::type;
186
187 template<class T, class U>
188 25058786x T exchange(T& t, U u) noexcept
189 {
190 25058786x T v = std::move(t);
191 25058786x t = std::move(u);
192 25058786x return v;
193 }
194
195 /* This is a derivative work, original copyright:
196
197 Copyright Eric Niebler 2013-present
198
199 Use, modification and distribution is subject to the
200 Boost Software License, Version 1.0. (See accompanying
201 file LICENSE_1_0.txt or copy at
202 http://www.boost.org/LICENSE_1_0.txt)
203
204 Project home: https://github.com/ericniebler/range-v3
205 */
206 template<typename T>
207 struct static_const
208 {
209 static constexpr T value {};
210 };
211 template<typename T>
212 constexpr T static_const<T>::value;
213
214 #define BOOST_JSON_INLINE_VARIABLE(name, type) \
215 namespace { constexpr auto& name = \
216 ::boost::json::detail::static_const<type>::value; \
217 } struct _unused_ ## name ## _semicolon_bait_
218
219 } // detail
220 } // namespace json
221 } // namespace boost
222
223 #ifndef BOOST_JSON_ALLOW_DEPRECATED
224 # ifdef BOOST_ALLOW_DEPRECATED
225 # define BOOST_JSON_ALLOW_DEPRECATED
226 # endif
227 #endif
228
229 #if defined(BOOST_GCC) && BOOST_GCC < 50000 && !defined(BOOST_JSON_ALLOW_DEPRECATED)
230 # pragma GCC warning "Support for GCC versions below 5.0 is deprecated and will stop in Boost 1.88.0. To suppress this message define macro BOOST_JSON_ALLOW_DEPRECATED."
231 #endif
232
233 #ifndef BOOST_JSON_ALLOW_DEPRECATED
234 # define BOOST_JSON_DEPRECATED(x) BOOST_DEPRECATED(x)
235 #else
236 # define BOOST_JSON_DEPRECATED(x)
237 #endif
238
239 #ifndef BOOST_ALL_NO_EMBEDDED_GDB_SCRIPTS
240 #include <boost/json/detail/gdb_printers.hpp>
241 #endif
242
243 #endif
244