aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/cxxsupp/libcxx/include/exception
blob: 5bcd5817e4469a00e24c0ffc57ceb9897e595879 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_EXCEPTION
#define _LIBCPP_EXCEPTION

/*
    exception synopsis

namespace std
{

class exception
{
public:
    exception() noexcept;
    exception(const exception&) noexcept;
    exception& operator=(const exception&) noexcept;
    virtual ~exception() noexcept;
    virtual const char* what() const noexcept;
};

class bad_exception
    : public exception
{
public:
    bad_exception() noexcept;
    bad_exception(const bad_exception&) noexcept;
    bad_exception& operator=(const bad_exception&) noexcept;
    virtual ~bad_exception() noexcept;
    virtual const char* what() const noexcept;
};

typedef void (*unexpected_handler)();
unexpected_handler set_unexpected(unexpected_handler  f ) noexcept;
unexpected_handler get_unexpected() noexcept;
[[noreturn]] void unexpected();

typedef void (*terminate_handler)();
terminate_handler set_terminate(terminate_handler  f ) noexcept;
terminate_handler get_terminate() noexcept;
[[noreturn]] void terminate() noexcept;

bool uncaught_exception()  noexcept;
int  uncaught_exceptions() noexcept;  // C++17

typedef unspecified exception_ptr;

exception_ptr current_exception() noexcept;
void rethrow_exception [[noreturn]] (exception_ptr p);
template<class E> exception_ptr make_exception_ptr(E e) noexcept;

class nested_exception
{
public:
    nested_exception() noexcept;
    nested_exception(const nested_exception&) noexcept = default;
    nested_exception& operator=(const nested_exception&) noexcept = default;
    virtual ~nested_exception() = default;

    // access functions
    [[noreturn]] void rethrow_nested() const;
    exception_ptr nested_ptr() const noexcept;
};

template <class T> [[noreturn]] void throw_with_nested(T&& t);
template <class E> void rethrow_if_nested(const E& e);

}  // std

*/

#include <__availability>
#include <__config>
#include <__memory/addressof.h>
#include <cstddef>
#include <cstdlib>
#include <type_traits>
#include <version>

#if defined(_LIBCPP_ABI_VCRUNTIME)
#include <vcruntime_exception.h>
#endif

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif

namespace std  // purposefully not using versioning namespace
{

#if !defined(_LIBCPP_ABI_VCRUNTIME)
class _LIBCPP_EXCEPTION_ABI exception
{
public:
    _LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
    _LIBCPP_INLINE_VISIBILITY exception(const exception&) _NOEXCEPT = default;

    virtual ~exception() _NOEXCEPT;
    virtual const char* what() const _NOEXCEPT;
};

class _LIBCPP_EXCEPTION_ABI bad_exception
    : public exception
{
public:
    _LIBCPP_INLINE_VISIBILITY bad_exception() _NOEXCEPT {}
    virtual ~bad_exception() _NOEXCEPT;
    virtual const char* what() const _NOEXCEPT;
};
#endif // !_LIBCPP_ABI_VCRUNTIME

#if _LIBCPP_STD_VER <= 14 \
    || defined(_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS) \
    || defined(_LIBCPP_BUILDING_LIBRARY)
typedef void (*unexpected_handler)();
_LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;
_LIBCPP_FUNC_VIS unexpected_handler get_unexpected() _NOEXCEPT;
_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void unexpected();
#endif

typedef void (*terminate_handler)();
_LIBCPP_FUNC_VIS terminate_handler set_terminate(terminate_handler) _NOEXCEPT;
_LIBCPP_FUNC_VIS terminate_handler get_terminate() _NOEXCEPT;
_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void terminate() _NOEXCEPT;

_LIBCPP_FUNC_VIS bool uncaught_exception() _NOEXCEPT;
_LIBCPP_FUNC_VIS _LIBCPP_AVAILABILITY_UNCAUGHT_EXCEPTIONS int uncaught_exceptions() _NOEXCEPT;

class _LIBCPP_TYPE_VIS exception_ptr;

_LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
_LIBCPP_NORETURN _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);

class _LIBCPP_TYPE_VIS exception_ptr
{
    void* __ptr_;
public:
    _LIBCPP_INLINE_VISIBILITY exception_ptr() _NOEXCEPT : __ptr_() {}
    _LIBCPP_INLINE_VISIBILITY exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}

    exception_ptr(const exception_ptr&) _NOEXCEPT;
    exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
    ~exception_ptr() _NOEXCEPT;

    _LIBCPP_INLINE_VISIBILITY explicit operator bool() const _NOEXCEPT
    {return __ptr_ != nullptr;}

    friend _LIBCPP_INLINE_VISIBILITY
    bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
        {return __x.__ptr_ == __y.__ptr_;}

    friend _LIBCPP_INLINE_VISIBILITY
    bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT
        {return !(__x == __y);}

    friend _LIBCPP_FUNC_VIS void swap(exception_ptr& __x, exception_ptr& __y) _NOEXCEPT
    {
        void* __tmp = __x.__ptr_;
        __x.__ptr_ = __y.__ptr_;
        __y.__ptr_ = __tmp;
    }

    friend _LIBCPP_FUNC_VIS exception_ptr current_exception() _NOEXCEPT;
    friend _LIBCPP_FUNC_VIS void rethrow_exception(exception_ptr);
};

#ifndef _LIBCPP_ABI_MICROSOFT

template<class _Ep>
_LIBCPP_INLINE_VISIBILITY exception_ptr
make_exception_ptr(_Ep __e) _NOEXCEPT
{
#ifndef _LIBCPP_NO_EXCEPTIONS
    try
    {
        throw __e;
    }
    catch (...)
    {
        return current_exception();
    }
#else
    ((void)__e);
    _VSTD::abort();
#endif
}

#else // _LIBCPP_ABI_MICROSOFT

_LIBCPP_FUNC_VIS exception_ptr __copy_exception_ptr(void *__exception, const void* __ptr);

// This is a built-in template function which automagically extracts the required
// information.
template <class _E> void *__GetExceptionInfo(_E);

template<class _Ep>
exception_ptr
make_exception_ptr(_Ep __e) _NOEXCEPT
{
  return __copy_exception_ptr(_VSTD::addressof(__e), __GetExceptionInfo(__e));
}

#endif // _LIBCPP_ABI_MICROSOFT
// nested_exception

class _LIBCPP_EXCEPTION_ABI nested_exception
{
    exception_ptr __ptr_;
public:
    nested_exception() _NOEXCEPT;
//     nested_exception(const nested_exception&) noexcept = default;
//     nested_exception& operator=(const nested_exception&) noexcept = default;
    virtual ~nested_exception() _NOEXCEPT;

    // access functions
    _LIBCPP_NORETURN void rethrow_nested() const;
    _LIBCPP_INLINE_VISIBILITY exception_ptr nested_ptr() const _NOEXCEPT {return __ptr_;}
};

template <class _Tp>
struct __nested
    : public _Tp,
      public nested_exception
{
    _LIBCPP_INLINE_VISIBILITY explicit __nested(const _Tp& __t) : _Tp(__t) {}
};

#ifndef _LIBCPP_NO_EXCEPTIONS
template <class _Tp, class _Up, bool>
struct __throw_with_nested;

template <class _Tp, class _Up>
struct __throw_with_nested<_Tp, _Up, true> {
    _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void
    __do_throw(_Tp&& __t)
    {
        throw __nested<_Up>(static_cast<_Tp&&>(__t));
    }
};

template <class _Tp, class _Up>
struct __throw_with_nested<_Tp, _Up, false> {
    _LIBCPP_NORETURN static inline _LIBCPP_INLINE_VISIBILITY void
#ifndef _LIBCPP_CXX03_LANG
    __do_throw(_Tp&& __t)
#else
    __do_throw (_Tp& __t)
#endif // _LIBCPP_CXX03_LANG
    {
        throw static_cast<_Tp&&>(__t);
    }
};
#endif

template <class _Tp>
_LIBCPP_NORETURN
void
throw_with_nested(_Tp&& __t)
{
#ifndef _LIBCPP_NO_EXCEPTIONS
    typedef typename decay<_Tp>::type _Up;
    static_assert( is_copy_constructible<_Up>::value, "type thrown must be CopyConstructible");
    __throw_with_nested<_Tp, _Up,
        is_class<_Up>::value &&
        !is_base_of<nested_exception, _Up>::value &&
        !__libcpp_is_final<_Up>::value>::
            __do_throw(static_cast<_Tp&&>(__t));
#else
    ((void)__t);
    // FIXME: Make this abort
#endif
}

template <class _From, class _To>
struct __can_dynamic_cast : public _LIBCPP_BOOL_CONSTANT(
              is_polymorphic<_From>::value &&
                 (!is_base_of<_To, _From>::value ||
                   is_convertible<const _From*, const _To*>::value)) {};

template <class _Ep>
inline _LIBCPP_INLINE_VISIBILITY
void
rethrow_if_nested(const _Ep& __e,
                  typename enable_if< __can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
{
    const nested_exception* __nep = dynamic_cast<const nested_exception*>(_VSTD::addressof(__e));
    if (__nep)
        __nep->rethrow_nested();
}

template <class _Ep>
inline _LIBCPP_INLINE_VISIBILITY
void
rethrow_if_nested(const _Ep&,
                  typename enable_if<!__can_dynamic_cast<_Ep, nested_exception>::value>::type* = 0)
{
}

} // namespace std

#endif // _LIBCPP_EXCEPTION