exception.cpp revision 232969
1//===------------------------ exception.cpp -------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9#include <stdlib.h> 10 11#include "exception" 12 13#if __APPLE__ 14 #include <cxxabi.h> 15 16 using namespace __cxxabiv1; 17 #define HAVE_DEPENDENT_EH_ABI 1 18 #ifndef _LIBCPPABI_VERSION 19 using namespace __cxxabiapple; 20 // On Darwin, there are two STL shared libraries and a lower level ABI 21 // shared libray. The globals holding the current terminate handler and 22 // current unexpected handler are in the ABI library. 23 #define __terminate_handler __cxxabiapple::__cxa_terminate_handler 24 #define __unexpected_handler __cxxabiapple::__cxa_unexpected_handler 25 #endif // _LIBCPPABI_VERSION 26#elif defined(LIBCXXRT) 27 #include <cxxabi.h> 28 using namespace __cxxabiv1; 29 #define HAVE_DEPENDENT_EH_ABI 1 30#else // __APPLE__ 31 static std::terminate_handler __terminate_handler; 32 static std::unexpected_handler __unexpected_handler; 33#endif // __APPLE__ 34 35namespace std 36{ 37 38#if !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION) 39 40// libcxxrt provides implementations of these functions itself. 41unexpected_handler 42set_unexpected(unexpected_handler func) _NOEXCEPT 43{ 44 return __sync_lock_test_and_set(&__unexpected_handler, func); 45} 46 47unexpected_handler 48get_unexpected() _NOEXCEPT 49{ 50 return __sync_fetch_and_add(&__unexpected_handler, (unexpected_handler)0); 51} 52 53_ATTRIBUTE(noreturn) 54void 55unexpected() 56{ 57 (*get_unexpected())(); 58 // unexpected handler should not return 59 terminate(); 60} 61 62terminate_handler 63set_terminate(terminate_handler func) _NOEXCEPT 64{ 65 return __sync_lock_test_and_set(&__terminate_handler, func); 66} 67 68terminate_handler 69get_terminate() _NOEXCEPT 70{ 71 return __sync_fetch_and_add(&__terminate_handler, (terminate_handler)0); 72} 73 74_ATTRIBUTE(noreturn) 75void 76terminate() _NOEXCEPT 77{ 78#ifndef _LIBCPP_NO_EXCEPTIONS 79 try 80 { 81#endif // _LIBCPP_NO_EXCEPTIONS 82 (*get_terminate())(); 83 // handler should not return 84 ::abort (); 85#ifndef _LIBCPP_NO_EXCEPTIONS 86 } 87 catch (...) 88 { 89 // handler should not throw exception 90 ::abort (); 91 } 92#endif // _LIBCPP_NO_EXCEPTIONS 93} 94#endif // !defined(LIBCXXRT) && !defined(_LIBCPPABI_VERSION) 95 96#ifndef LIBCXXRT 97bool uncaught_exception() _NOEXCEPT 98{ 99#if __APPLE__ 100 // on Darwin, there is a helper function so __cxa_get_globals is private 101 return __cxa_uncaught_exception(); 102#elif LIBCXXRT 103 __cxa_eh_globals * globals = __cxa_get_globals(); 104 return (globals->uncaughtExceptions != 0); 105#else // __APPLE__ 106 #warning uncaught_exception not yet implemented 107 ::abort(); 108#endif // __APPLE__ 109} 110 111#ifndef _LIBCPPABI_VERSION 112 113exception::~exception() _NOEXCEPT 114{ 115} 116 117const char* exception::what() const _NOEXCEPT 118{ 119 return "std::exception"; 120} 121 122#endif // _LIBCPPABI_VERSION 123#endif //LIBCXXRT 124#ifndef _LIBCPPABI_VERSION 125 126bad_exception::~bad_exception() _NOEXCEPT 127{ 128} 129 130const char* bad_exception::what() const _NOEXCEPT 131{ 132 return "std::bad_exception"; 133} 134 135#endif 136 137 138exception_ptr::~exception_ptr() _NOEXCEPT 139{ 140#if HAVE_DEPENDENT_EH_ABI 141 __cxa_decrement_exception_refcount(__ptr_); 142#else 143 #warning exception_ptr not yet implemented 144 ::abort(); 145#endif // __APPLE__ 146} 147 148exception_ptr::exception_ptr(const exception_ptr& other) _NOEXCEPT 149 : __ptr_(other.__ptr_) 150{ 151#if HAVE_DEPENDENT_EH_ABI 152 __cxa_increment_exception_refcount(__ptr_); 153#else 154 #warning exception_ptr not yet implemented 155 ::abort(); 156#endif // __APPLE__ 157} 158 159exception_ptr& exception_ptr::operator=(const exception_ptr& other) _NOEXCEPT 160{ 161#if HAVE_DEPENDENT_EH_ABI 162 if (__ptr_ != other.__ptr_) 163 { 164 __cxa_increment_exception_refcount(other.__ptr_); 165 __cxa_decrement_exception_refcount(__ptr_); 166 __ptr_ = other.__ptr_; 167 } 168 return *this; 169#else // __APPLE__ 170 #warning exception_ptr not yet implemented 171 ::abort(); 172#endif // __APPLE__ 173} 174 175nested_exception::nested_exception() _NOEXCEPT 176 : __ptr_(current_exception()) 177{ 178} 179 180nested_exception::~nested_exception() _NOEXCEPT 181{ 182} 183 184_ATTRIBUTE(noreturn) 185void 186nested_exception::rethrow_nested() const 187{ 188 if (__ptr_ == nullptr) 189 terminate(); 190 rethrow_exception(__ptr_); 191} 192 193 194exception_ptr current_exception() _NOEXCEPT 195{ 196#if HAVE_DEPENDENT_EH_ABI 197 // be nicer if there was a constructor that took a ptr, then 198 // this whole function would be just: 199 // return exception_ptr(__cxa_current_primary_exception()); 200 exception_ptr ptr; 201 ptr.__ptr_ = __cxa_current_primary_exception(); 202 return ptr; 203#else // __APPLE__ 204 #warning exception_ptr not yet implemented 205 ::abort(); 206#endif // __APPLE__ 207} 208 209_ATTRIBUTE(noreturn) 210void rethrow_exception(exception_ptr p) 211{ 212#if HAVE_DEPENDENT_EH_ABI 213 __cxa_rethrow_primary_exception(p.__ptr_); 214 // if p.__ptr_ is NULL, above returns so we terminate 215 terminate(); 216#else // __APPLE__ 217 #warning exception_ptr not yet implemented 218 ::abort(); 219#endif // __APPLE__ 220} 221} // std 222