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