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1 //===------------------------- cxa_default_handlers.cpp -------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //
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8 // This file implements the default terminate_handler and unexpected_handler.
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9 //===----------------------------------------------------------------------===//
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10
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11 #include <exception>
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12 #include <stdlib.h>
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13 #include "abort_message.h"
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14 #include "cxxabi.h"
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15 #include "cxa_handlers.h"
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16 #include "cxa_exception.h"
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17 #include "private_typeinfo.h"
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18 #include "include/atomic_support.h"
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19
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20 #if !defined(LIBCXXABI_SILENT_TERMINATE)
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21
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22 _LIBCPP_SAFE_STATIC
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23 static const char* cause = "uncaught";
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24
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25 __attribute__((noreturn))
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26 static void demangling_terminate_handler()
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27 {
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28 #ifndef _LIBCXXABI_NO_EXCEPTIONS
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29 // If there might be an uncaught exception
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30 using namespace __cxxabiv1;
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31 __cxa_eh_globals* globals = __cxa_get_globals_fast();
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32 if (globals)
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33 {
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34 __cxa_exception* exception_header = globals->caughtExceptions;
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35 // If there is an uncaught exception
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36 if (exception_header)
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37 {
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38 _Unwind_Exception* unwind_exception =
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39 reinterpret_cast<_Unwind_Exception*>(exception_header + 1) - 1;
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40 if (__isOurExceptionClass(unwind_exception))
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41 {
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42 void* thrown_object =
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43 __getExceptionClass(unwind_exception) == kOurDependentExceptionClass ?
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44 ((__cxa_dependent_exception*)exception_header)->primaryException :
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45 exception_header + 1;
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46 const __shim_type_info* thrown_type =
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47 static_cast<const __shim_type_info*>(exception_header->exceptionType);
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48 // Try to get demangled name of thrown_type
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49 int status;
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50 char buf[1024];
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51 size_t len = sizeof(buf);
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52 const char* name = __cxa_demangle(thrown_type->name(), buf, &len, &status);
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53 if (status != 0)
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54 name = thrown_type->name();
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55 // If the uncaught exception can be caught with std::exception&
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56 const __shim_type_info* catch_type =
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57 static_cast<const __shim_type_info*>(&typeid(std::exception));
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58 if (catch_type->can_catch(thrown_type, thrown_object))
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59 {
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60 // Include the what() message from the exception
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61 const std::exception* e = static_cast<const std::exception*>(thrown_object);
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62 abort_message("terminating with %s exception of type %s: %s",
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63 cause, name, e->what());
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64 }
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65 else
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66 // Else just note that we're terminating with an exception
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67 abort_message("terminating with %s exception of type %s",
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68 cause, name);
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69 }
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70 else
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71 // Else we're terminating with a foreign exception
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72 abort_message("terminating with %s foreign exception", cause);
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73 }
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74 }
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75 #endif
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76 // Else just note that we're terminating
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77 abort_message("terminating");
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78 }
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79
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80 __attribute__((noreturn))
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81 static void demangling_unexpected_handler()
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82 {
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83 cause = "unexpected";
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84 std::terminate();
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85 }
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86
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87 static constexpr std::terminate_handler default_terminate_handler = demangling_terminate_handler;
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88 static constexpr std::terminate_handler default_unexpected_handler = demangling_unexpected_handler;
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89 #else
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90 static constexpr std::terminate_handler default_terminate_handler = ::abort;
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91 static constexpr std::terminate_handler default_unexpected_handler = std::terminate;
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92 #endif
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93
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94 //
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95 // Global variables that hold the pointers to the current handler
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96 //
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97 _LIBCXXABI_DATA_VIS
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98 _LIBCPP_SAFE_STATIC std::terminate_handler __cxa_terminate_handler = default_terminate_handler;
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99
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100 _LIBCXXABI_DATA_VIS
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101 _LIBCPP_SAFE_STATIC std::unexpected_handler __cxa_unexpected_handler = default_unexpected_handler;
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102
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103 namespace std
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104 {
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105
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106 unexpected_handler
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107 set_unexpected(unexpected_handler func) _NOEXCEPT
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108 {
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109 if (func == 0)
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110 func = default_unexpected_handler;
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111 return __libcpp_atomic_exchange(&__cxa_unexpected_handler, func,
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112 _AO_Acq_Rel);
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113 }
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114
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115 terminate_handler
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116 set_terminate(terminate_handler func) _NOEXCEPT
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117 {
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118 if (func == 0)
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119 func = default_terminate_handler;
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120 return __libcpp_atomic_exchange(&__cxa_terminate_handler, func,
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121 _AO_Acq_Rel);
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122 }
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123
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124 }
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