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/static_assert.hpp>
17		#include <boost/throw_exception.hpp>
18		#include <cstdint>
19		#include <type_traits>
20		#include <utility>
21
22		// detect 32/64 bit
23		#if UINTPTR_MAX == UINT64_MAX
24		# define BOOST_JSON_ARCH 64
25		#elif UINTPTR_MAX == UINT32_MAX
26		# define BOOST_JSON_ARCH 32
27		#else
28		# error Unknown or unsupported architecture, please open an issue
29		#endif
30
31		#ifndef BOOST_JSON_REQUIRE_CONST_INIT
32		# define BOOST_JSON_REQUIRE_CONST_INIT
33		# if __cpp_constinit >= 201907L
34		# undef BOOST_JSON_REQUIRE_CONST_INIT
35		# define BOOST_JSON_REQUIRE_CONST_INIT constinit
36		# elif defined(__clang__) && defined(__has_cpp_attribute)
37		# if __has_cpp_attribute(clang::require_constant_initialization)
38		# undef BOOST_JSON_REQUIRE_CONST_INIT
39		# define BOOST_JSON_REQUIRE_CONST_INIT [[clang::require_constant_initialization]]
40		# endif
41		# endif
42		#endif
43
44		#ifndef BOOST_JSON_NO_DESTROY
45		# if defined(__clang__) && defined(__has_cpp_attribute)
46		# if __has_cpp_attribute(clang::no_destroy)
47		# define BOOST_JSON_NO_DESTROY [[clang::no_destroy]]
48		# endif
49		# endif
50		#endif
51
52		#if ! defined(BOOST_JSON_NO_SSE2) && \
53		! defined(BOOST_JSON_USE_SSE2)
54		# if (defined(_M_IX86) && _M_IX86_FP == 2) || \
55		defined(_M_X64) || defined(__SSE2__)
56		# define BOOST_JSON_USE_SSE2
57		# endif
58		#endif
59
60		#if defined(BOOST_JSON_DOCS)
61		# define BOOST_JSON_DECL
62		#else
63		# if (defined(BOOST_JSON_DYN_LINK) || defined(BOOST_ALL_DYN_LINK)) && !defined(BOOST_JSON_STATIC_LINK)
64		# if defined(BOOST_JSON_SOURCE)
65		# define BOOST_JSON_DECL BOOST_SYMBOL_EXPORT
66		# else
67		# define BOOST_JSON_DECL BOOST_SYMBOL_IMPORT
68		# endif
69		# endif // shared lib
70		# ifndef BOOST_JSON_DECL
71		# define BOOST_JSON_DECL
72		# endif
73		# if !defined(BOOST_JSON_SOURCE) && !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_JSON_NO_LIB)
74		# define BOOST_LIB_NAME boost_json
75		# if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_JSON_DYN_LINK)
76		# define BOOST_DYN_LINK
77		# endif
78		# include <boost/config/auto_link.hpp>
79		# endif
80		#endif
81
82		#ifndef BOOST_JSON_LIKELY
83		# define BOOST_JSON_LIKELY(x) BOOST_LIKELY( !!(x) )
84		#endif
85
86		#ifndef BOOST_JSON_UNLIKELY
87		# define BOOST_JSON_UNLIKELY(x) BOOST_UNLIKELY( !!(x) )
88		#endif
89
90		#ifndef BOOST_JSON_UNREACHABLE
91		# ifdef _MSC_VER
92		# define BOOST_JSON_UNREACHABLE() __assume(0)
93		# elif defined(__GNUC__) || defined(__clang__)
94		# define BOOST_JSON_UNREACHABLE() __builtin_unreachable()
95		# elif defined(__has_builtin)
96		# if __has_builtin(__builtin_unreachable)
97		# define BOOST_JSON_UNREACHABLE() __builtin_unreachable()
98		# endif
99		# else
100		# define BOOST_JSON_UNREACHABLE() static_cast<void>(0)
101		# endif
102		#endif
103
104		#ifndef BOOST_JSON_ASSUME
105		# define BOOST_JSON_ASSUME(x) (!!(x) ? void() : BOOST_JSON_UNREACHABLE())
106		# ifdef _MSC_VER
107		# undef BOOST_JSON_ASSUME
108		# define BOOST_JSON_ASSUME(x) __assume(!!(x))
109		# elif defined(__has_builtin)
110		# if __has_builtin(__builtin_assume)
111		# undef BOOST_JSON_ASSUME
112		# define BOOST_JSON_ASSUME(x) __builtin_assume(!!(x))
113		# endif
114		# endif
115		#endif
116
117		// older versions of msvc and clang don't always
118		// constant initialize when they are supposed to
119		#ifndef BOOST_JSON_WEAK_CONSTINIT
120		# if defined(_MSC_VER) && ! defined(__clang__) && _MSC_VER < 1920
121		# define BOOST_JSON_WEAK_CONSTINIT
122		# elif defined(__clang__) && __clang_major__ < 4
123		# define BOOST_JSON_WEAK_CONSTINIT
124		# endif
125		#endif
126
127		// These macros are private, for tests, do not change
128		// them or else previously built libraries won't match.
129		#ifndef BOOST_JSON_MAX_STRING_SIZE
130		# define BOOST_JSON_NO_MAX_STRING_SIZE
131		# define BOOST_JSON_MAX_STRING_SIZE 0x7ffffffe
132		#endif
133		#ifndef BOOST_JSON_MAX_STRUCTURED_SIZE
134		# define BOOST_JSON_NO_MAX_STRUCTURED_SIZE
135		# define BOOST_JSON_MAX_STRUCTURED_SIZE 0x7ffffffe
136		#endif
137		#ifndef BOOST_JSON_STACK_BUFFER_SIZE
138		# define BOOST_JSON_NO_STACK_BUFFER_SIZE
139		# if defined(__i386__) || defined(__x86_64__) || \
140		defined(_M_IX86) || defined(_M_X64)
141		# define BOOST_JSON_STACK_BUFFER_SIZE 4096
142		# else
143		// If we are not on Intel, then assume we are on
144		// embedded and use a smaller stack size. If this
145		// is not suitable, the user can define the macro
146		// themselves when building the library or including
147		// src.hpp.
148		# define BOOST_JSON_STACK_BUFFER_SIZE 256
149		# endif
150		#endif
151
152		#if defined(__cpp_constinit) && __cpp_constinit >= 201907L
153		# define BOOST_JSON_CONSTINIT constinit
154		#elif defined(__has_cpp_attribute) && defined(__clang__)
155		# if __has_cpp_attribute(clang::require_constant_initialization)
156		# define BOOST_JSON_CONSTINIT [[clang::require_constant_initialization]]
157		# endif
158		#elif defined(__GNUC__) && (__GNUC__ >= 10)
159		# define BOOST_JSON_CONSTINIT __constinit
160		#endif
161		#ifndef BOOST_JSON_CONSTINIT
162		# define BOOST_JSON_CONSTINIT
163		#endif
164
165		namespace boost {
166		namespace json {
167		namespace detail {
168
169		template<class...>
170		struct make_void
171		{
172		using type =void;
173		};
174
175		template<class... Ts>
176		using void_t = typename
177		make_void<Ts...>::type;
178
179		template<class T>
180		using remove_cvref = typename
181		std::remove_cv<typename
182		std::remove_reference<T>::type>::type;
183
184		template<class T, class U>
185	25057816	T exchange(T& t, U u) noexcept
186		{
187	25057816	T v = std::move(t);
188	25057816	t = std::move(u);
189	25057816	return v;
190		}
191
192		/* This is a derivative work, original copyright:
193
194		Copyright Eric Niebler 2013-present
195
196		Use, modification and distribution is subject to the
197		Boost Software License, Version 1.0. (See accompanying
198		file LICENSE_1_0.txt or copy at
199		http://www.boost.org/LICENSE_1_0.txt)
200
201		Project home: https://github.com/ericniebler/range-v3
202		*/
203		template<typename T>
204		struct static_const
205		{
206		static constexpr T value {};
207		};
208		template<typename T>
209		constexpr T static_const<T>::value;
210
211		#define BOOST_JSON_INLINE_VARIABLE(name, type) \
212		namespace { constexpr auto& name = \
213		::boost::json::detail::static_const<type>::value; \
214		} struct _unused_ ## name ## _semicolon_bait_
215
216		} // detail
217		} // namespace json
218		} // namespace boost
219
220		#ifndef BOOST_JSON_ALLOW_DEPRECATED
221		# ifdef BOOST_ALLOW_DEPRECATED
222		# define BOOST_JSON_ALLOW_DEPRECATED
223		# endif
224		#endif
225
226		#if defined(BOOST_GCC) && BOOST_GCC < 50000 && !defined(BOOST_JSON_ALLOW_DEPRECATED)
227		# 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."
228		#endif
229
230		#ifndef BOOST_JSON_ALLOW_DEPRECATED
231		# define BOOST_JSON_DEPRECATED(x) BOOST_DEPRECATED(x)
232		#else
233		# define BOOST_JSON_DEPRECATED(x)
234		#endif
235
236		#ifndef BOOST_ALL_NO_EMBEDDED_GDB_SCRIPTS
237		#include <boost/json/detail/gdb_printers.hpp>
238		#endif
239
240		#endif
241