detail/config.hpp

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detail/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_DESTROY
44		# if defined(__clang__) && defined(__has_cpp_attribute)
45		# if __has_cpp_attribute(clang::no_destroy)
46		# define BOOST_JSON_NO_DESTROY [[clang::no_destroy]]
47		# endif
48		# endif
49		#endif
50
51		#if ! defined(BOOST_JSON_NO_SSE2) && \
52		! defined(BOOST_JSON_USE_SSE2)
53		# if (defined(_M_IX86) && _M_IX86_FP == 2) || \
54		defined(_M_X64) || defined(__SSE2__)
55		# define BOOST_JSON_USE_SSE2
56		# endif
57		#endif
58
59		#if defined(BOOST_JSON_DOCS)
60		# define BOOST_JSON_DECL
61		#else
62		# if (defined(BOOST_JSON_DYN_LINK) || defined(BOOST_ALL_DYN_LINK)) && !defined(BOOST_JSON_STATIC_LINK)
63		# if defined(BOOST_JSON_SOURCE)
64		# define BOOST_JSON_DECL BOOST_SYMBOL_EXPORT
65		# else
66		# define BOOST_JSON_DECL BOOST_SYMBOL_IMPORT
67		# endif
68		# endif // shared lib
69		# ifndef BOOST_JSON_DECL
70		# define BOOST_JSON_DECL
71		# endif
72		# if !defined(BOOST_JSON_SOURCE) && !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_JSON_NO_LIB)
73		# define BOOST_LIB_NAME boost_json
74		# if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_JSON_DYN_LINK)
75		# define BOOST_DYN_LINK
76		# endif
77		# include <boost/config/auto_link.hpp>
78		# endif
79		#endif
80
81		#ifndef BOOST_JSON_LIKELY
82		# define BOOST_JSON_LIKELY(x) BOOST_LIKELY( !!(x) )
83		#endif
84
85		#ifndef BOOST_JSON_UNLIKELY
86		# define BOOST_JSON_UNLIKELY(x) BOOST_UNLIKELY( !!(x) )
87		#endif
88
89		#ifndef BOOST_JSON_UNREACHABLE
90		# ifdef _MSC_VER
91		# define BOOST_JSON_UNREACHABLE() __assume(0)
92		# elif defined(__GNUC__) || defined(__clang__)
93		# define BOOST_JSON_UNREACHABLE() __builtin_unreachable()
94		# elif defined(__has_builtin)
95		# if __has_builtin(__builtin_unreachable)
96		# define BOOST_JSON_UNREACHABLE() __builtin_unreachable()
97		# endif
98		# else
99		# define BOOST_JSON_UNREACHABLE() static_cast<void>(0)
100		# endif
101		#endif
102
103		#ifndef BOOST_JSON_ASSUME
104		# define BOOST_JSON_ASSUME(x) (!!(x) ? void() : BOOST_JSON_UNREACHABLE())
105		# ifdef _MSC_VER
106		# undef BOOST_JSON_ASSUME
107		# define BOOST_JSON_ASSUME(x) __assume(!!(x))
108		# elif defined(__has_builtin)
109		# if __has_builtin(__builtin_assume)
110		# undef BOOST_JSON_ASSUME
111		# define BOOST_JSON_ASSUME(x) __builtin_assume(!!(x))
112		# endif
113		# endif
114		#endif
115
116		// older versions of msvc and clang don't always
117		// constant initialize when they are supposed to
118		#ifndef BOOST_JSON_WEAK_CONSTINIT
119		# if defined(_MSC_VER) && ! defined(__clang__) && _MSC_VER < 1920
120		# define BOOST_JSON_WEAK_CONSTINIT
121		# elif defined(__clang__) && __clang_major__ < 4
122		# define BOOST_JSON_WEAK_CONSTINIT
123		# endif
124		#endif
125
126		// These macros are private, for tests, do not change
127		// them or else previously built libraries won't match.
128		#ifndef BOOST_JSON_MAX_STRING_SIZE
129		# define BOOST_JSON_NO_MAX_STRING_SIZE
130		# define BOOST_JSON_MAX_STRING_SIZE 0x7ffffffe
131		#endif
132		#ifndef BOOST_JSON_MAX_STRUCTURED_SIZE
133		# define BOOST_JSON_NO_MAX_STRUCTURED_SIZE
134		# define BOOST_JSON_MAX_STRUCTURED_SIZE 0x7ffffffe
135		#endif
136		#ifndef BOOST_JSON_STACK_BUFFER_SIZE
137		# define BOOST_JSON_NO_STACK_BUFFER_SIZE
138		# if defined(__i386__) || defined(__x86_64__) || \
139		defined(_M_IX86) || defined(_M_X64)
140		# define BOOST_JSON_STACK_BUFFER_SIZE 4096
141		# else
142		// If we are not on Intel, then assume we are on
143		// embedded and use a smaller stack size. If this
144		// is not suitable, the user can define the macro
145		// themselves when building the library or including
146		// src.hpp.
147		# define BOOST_JSON_STACK_BUFFER_SIZE 256
148		# endif
149		#endif
150
151		#if defined(__cpp_constinit) && __cpp_constinit >= 201907L
152		# define BOOST_JSON_CONSTINIT constinit
153		#elif defined(__has_cpp_attribute) && defined(__clang__)
154		# if __has_cpp_attribute(clang::require_constant_initialization)
155		# define BOOST_JSON_CONSTINIT [[clang::require_constant_initialization]]
156		# endif
157		#elif defined(__GNUC__) && (__GNUC__ >= 10)
158		# define BOOST_JSON_CONSTINIT __constinit
159		#endif
160		#ifndef BOOST_JSON_CONSTINIT
161		# define BOOST_JSON_CONSTINIT
162		#endif
163
164		namespace boost {
165		namespace json {
166		namespace detail {
167
168		template<class...>
169		struct make_void
170		{
171		using type =void;
172		};
173
174		template<class... Ts>
175		using void_t = typename
176		make_void<Ts...>::type;
177
178		template<class T>
179		using remove_cvref = typename
180		std::remove_cv<typename
181		std::remove_reference<T>::type>::type;
182
183		template<class T, class U>
184	25056816	T exchange(T& t, U u) noexcept
185		{
186	25056816	T v = std::move(t);
187	25056816	t = std::move(u);
188	25056816	return v;
189		}
190
191		/* This is a derivative work, original copyright:
192
193		Copyright Eric Niebler 2013-present
194
195		Use, modification and distribution is subject to the
196		Boost Software License, Version 1.0. (See accompanying
197		file LICENSE_1_0.txt or copy at
198		http://www.boost.org/LICENSE_1_0.txt)
199
200		Project home: https://github.com/ericniebler/range-v3
201		*/
202		template<typename T>
203		struct static_const
204		{
205		static constexpr T value {};
206		};
207		template<typename T>
208		constexpr T static_const<T>::value;
209
210		#define BOOST_JSON_INLINE_VARIABLE(name, type) \
211		namespace { constexpr auto& name = \
212		::boost::json::detail::static_const<type>::value; \
213		} struct _unused_ ## name ## _semicolon_bait_
214
215		} // detail
216		} // namespace json
217		} // namespace boost
218
219		#ifndef BOOST_JSON_ALLOW_DEPRECATED
220		# ifdef BOOST_ALLOW_DEPRECATED
221		# define BOOST_JSON_ALLOW_DEPRECATED
222		# endif
223		#endif
224
225		#if defined(BOOST_GCC) && BOOST_GCC < 50000 && !defined(BOOST_JSON_ALLOW_DEPRECATED)
226		# 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."
227		#endif
228
229		#ifndef BOOST_JSON_ALLOW_DEPRECATED
230		# define BOOST_JSON_DEPRECATED(x) BOOST_DEPRECATED(x)
231		#else
232		# define BOOST_JSON_DEPRECATED(x)
233		#endif
234
235		#ifndef BOOST_ALL_NO_EMBEDDED_GDB_SCRIPTS
236		#include <boost/json/detail/gdb_printers.hpp>
237		#endif
238
239		#endif
240