1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___EXCEPTION_EXCEPTION_PTR_H
10#define _LIBCPP___EXCEPTION_EXCEPTION_PTR_H
11
12#include <__config>
13#include <__exception/operations.h>
14#include <__memory/addressof.h>
15#include <__memory/construct_at.h>
16#include <__type_traits/decay.h>
17#include <cstddef>
18#include <cstdlib>
19#include <new>
20#include <typeinfo>
21
22#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23# pragma GCC system_header
24#endif
25
26#ifndef _LIBCPP_ABI_MICROSOFT
27
28# if _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION
29
30namespace __cxxabiv1 {
31
32extern "C" {
33_LIBCPP_OVERRIDABLE_FUNC_VIS void* __cxa_allocate_exception(size_t) throw();
34_LIBCPP_OVERRIDABLE_FUNC_VIS void __cxa_free_exception(void*) throw();
35
36struct __cxa_exception;
37_LIBCPP_OVERRIDABLE_FUNC_VIS __cxa_exception* __cxa_init_primary_exception(
38 void*,
39 std::type_info*,
40# if defined(_WIN32)
41 void(__thiscall*)(void*)) throw();
42# elif defined(__wasm__)
43 // In Wasm, a destructor returns its argument
44 void* (*)(void*)) throw();
45# else
46 void (*)(void*)) throw();
47# endif
48}
49
50} // namespace __cxxabiv1
51
52# endif
53
54#endif
55
56namespace std { // purposefully not using versioning namespace
57
58#ifndef _LIBCPP_ABI_MICROSOFT
59
60class _LIBCPP_EXPORTED_FROM_ABI exception_ptr {
61 void* __ptr_;
62
63 static exception_ptr __from_native_exception_pointer(void*) _NOEXCEPT;
64
65 template <class _Ep>
66 friend _LIBCPP_HIDE_FROM_ABI exception_ptr make_exception_ptr(_Ep) _NOEXCEPT;
67
68public:
69 // exception_ptr is basically a COW string.
70 using __trivially_relocatable = exception_ptr;
71
72 _LIBCPP_HIDE_FROM_ABI exception_ptr() _NOEXCEPT : __ptr_() {}
73 _LIBCPP_HIDE_FROM_ABI exception_ptr(nullptr_t) _NOEXCEPT : __ptr_() {}
74
75 exception_ptr(const exception_ptr&) _NOEXCEPT;
76 exception_ptr& operator=(const exception_ptr&) _NOEXCEPT;
77 ~exception_ptr() _NOEXCEPT;
78
79 _LIBCPP_HIDE_FROM_ABI explicit operator bool() const _NOEXCEPT { return __ptr_ != nullptr; }
80
81 friend _LIBCPP_HIDE_FROM_ABI bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT {
82 return __x.__ptr_ == __y.__ptr_;
83 }
84
85 friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT {
86 return !(__x == __y);
87 }
88
89 friend _LIBCPP_EXPORTED_FROM_ABI exception_ptr current_exception() _NOEXCEPT;
90 friend _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
91};
92
93template <class _Ep>
94_LIBCPP_HIDE_FROM_ABI exception_ptr make_exception_ptr(_Ep __e) _NOEXCEPT {
95# ifndef _LIBCPP_HAS_NO_EXCEPTIONS
96# if _LIBCPP_AVAILABILITY_HAS_INIT_PRIMARY_EXCEPTION && __cplusplus >= 201103L
97 using _Ep2 = __decay_t<_Ep>;
98
99 void* __ex = __cxxabiv1::__cxa_allocate_exception(sizeof(_Ep));
100# ifdef __wasm__
101 // In Wasm, a destructor returns its argument
102 (void)__cxxabiv1::__cxa_init_primary_exception(
103 __ex, const_cast<std::type_info*>(&typeid(_Ep)), [](void* __p) -> void* {
104# else
105 (void)__cxxabiv1::__cxa_init_primary_exception(__ex, const_cast<std::type_info*>(&typeid(_Ep)), [](void* __p) {
106# endif
107 std::__destroy_at(static_cast<_Ep2*>(__p));
108# ifdef __wasm__
109 return __p;
110# endif
111 });
112
113 try {
114 ::new (__ex) _Ep2(__e);
115 return exception_ptr::__from_native_exception_pointer(__ex);
116 } catch (...) {
117 __cxxabiv1::__cxa_free_exception(__ex);
118 return current_exception();
119 }
120# else
121 try {
122 throw __e;
123 } catch (...) {
124 return current_exception();
125 }
126# endif
127# else
128 ((void)__e);
129 std::abort();
130# endif
131}
132
133#else // _LIBCPP_ABI_MICROSOFT
134
135class _LIBCPP_EXPORTED_FROM_ABI exception_ptr {
136 _LIBCPP_DIAGNOSTIC_PUSH
137 _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wunused-private-field")
138 void* __ptr1_;
139 void* __ptr2_;
140 _LIBCPP_DIAGNOSTIC_POP
141
142public:
143 exception_ptr() _NOEXCEPT;
144 exception_ptr(nullptr_t) _NOEXCEPT;
145 exception_ptr(const exception_ptr& __other) _NOEXCEPT;
146 exception_ptr& operator=(const exception_ptr& __other) _NOEXCEPT;
147 exception_ptr& operator=(nullptr_t) _NOEXCEPT;
148 ~exception_ptr() _NOEXCEPT;
149 explicit operator bool() const _NOEXCEPT;
150};
151
152_LIBCPP_EXPORTED_FROM_ABI bool operator==(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT;
153
154inline _LIBCPP_HIDE_FROM_ABI bool operator!=(const exception_ptr& __x, const exception_ptr& __y) _NOEXCEPT {
155 return !(__x == __y);
156}
157
158_LIBCPP_EXPORTED_FROM_ABI void swap(exception_ptr&, exception_ptr&) _NOEXCEPT;
159
160_LIBCPP_EXPORTED_FROM_ABI exception_ptr __copy_exception_ptr(void* __except, const void* __ptr);
161_LIBCPP_EXPORTED_FROM_ABI exception_ptr current_exception() _NOEXCEPT;
162_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void rethrow_exception(exception_ptr);
163
164// This is a built-in template function which automagically extracts the required
165// information.
166template <class _E>
167void* __GetExceptionInfo(_E);
168
169template <class _Ep>
170_LIBCPP_HIDE_FROM_ABI exception_ptr make_exception_ptr(_Ep __e) _NOEXCEPT {
171 return __copy_exception_ptr(std::addressof(__e), __GetExceptionInfo(__e));
172}
173
174#endif // _LIBCPP_ABI_MICROSOFT
175} // namespace std
176
177#endif // _LIBCPP___EXCEPTION_EXCEPTION_PTR_H
178