1//===------------------------- cxa_default_handlers.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// This file implements the default terminate_handler and unexpected_handler. 10//===----------------------------------------------------------------------===// 11 12#include <stdexcept> 13#include <new> 14#include <exception> 15#include "abort_message.h" 16#include "config.h" // For __sync_swap 17#include "cxxabi.h" 18#include "cxa_handlers.hpp" 19#include "cxa_exception.hpp" 20#include "private_typeinfo.h" 21 22static const char* cause = "uncaught"; 23 24#ifdef __k1om__ 25#define __sync_swap(a, b) __sync_lock_test_and_set(a, b) 26#else 27#define __sync_swap(a, b) __atomic_exchange_n(a, b, __ATOMIC_SEQ_CST) 28#endif 29 30__attribute__((noreturn)) 31static void default_terminate_handler() 32{ 33 // If there might be an uncaught exception 34 using namespace __cxxabiv1; 35 __cxa_eh_globals* globals = __cxa_get_globals_fast(); 36 if (globals) 37 { 38 __cxa_exception* exception_header = globals->caughtExceptions; 39 // If there is an uncaught exception 40 if (exception_header) 41 { 42 _Unwind_Exception* unwind_exception = 43 reinterpret_cast<_Unwind_Exception*>(exception_header + 1) - 1; 44 bool native_exception = 45 (unwind_exception->exception_class & get_vendor_and_language) == 46 (kOurExceptionClass & get_vendor_and_language); 47 if (native_exception) 48 { 49 void* thrown_object = 50 unwind_exception->exception_class == kOurDependentExceptionClass ? 51 ((__cxa_dependent_exception*)exception_header)->primaryException : 52 exception_header + 1; 53 const __shim_type_info* thrown_type = 54 static_cast<const __shim_type_info*>(exception_header->exceptionType); 55 // Try to get demangled name of thrown_type 56 int status; 57 char buf[1024]; 58 size_t len = sizeof(buf); 59 const char* name = __cxa_demangle(thrown_type->name(), buf, &len, &status); 60 if (status != 0) 61 name = thrown_type->name(); 62 // If the uncaught exception can be caught with std::exception& 63 const __shim_type_info* catch_type = 64 static_cast<const __shim_type_info*>(&typeid(std::exception)); 65 if (catch_type->can_catch(thrown_type, thrown_object)) 66 { 67 // Include the what() message from the exception 68 const std::exception* e = static_cast<const std::exception*>(thrown_object); 69 abort_message("terminating with %s exception of type %s: %s", 70 cause, name, e->what()); 71 } 72 else 73 // Else just note that we're terminating with an exception 74 abort_message("terminating with %s exception of type %s", 75 cause, name); 76 } 77 else 78 // Else we're terminating with a foreign exception 79 abort_message("terminating with %s foreign exception", cause); 80 } 81 } 82 // Else just note that we're terminating 83 abort_message("terminating"); 84} 85 86__attribute__((noreturn)) 87static void default_unexpected_handler() 88{ 89 cause = "unexpected"; 90 std::terminate(); 91} 92 93 94// 95// Global variables that hold the pointers to the current handler 96// 97std::terminate_handler __cxa_terminate_handler = default_terminate_handler; 98std::unexpected_handler __cxa_unexpected_handler = default_unexpected_handler; 99 100// In the future these will become: 101// std::atomic<std::terminate_handler> __cxa_terminate_handler(default_terminate_handler); 102// std::atomic<std::unexpected_handler> __cxa_unexpected_handler(default_unexpected_handler); 103 104namespace std 105{ 106 107unexpected_handler 108set_unexpected(unexpected_handler func) _NOEXCEPT 109{ 110 if (func == 0) 111 func = default_unexpected_handler; 112 return __sync_swap(&__cxa_unexpected_handler, func); 113// Using of C++11 atomics this should be rewritten 114// return __cxa_unexpected_handler.exchange(func, memory_order_acq_rel); 115} 116 117terminate_handler 118set_terminate(terminate_handler func) _NOEXCEPT 119{ 120 if (func == 0) 121 func = default_terminate_handler; 122 return __sync_swap(&__cxa_terminate_handler, func); 123// Using of C++11 atomics this should be rewritten 124// return __cxa_terminate_handler.exchange(func, memory_order_acq_rel); 125} 126 127} 128