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1 // -*- C++ -*- Exception handling routines for throwing.
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2 // Copyright (C) 2001-2017 Free Software Foundation, Inc.
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3 //
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4 // This file is part of GCC.
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5 //
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6 // GCC is free software; you can redistribute it and/or modify
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7 // it under the terms of the GNU General Public License as published by
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8 // the Free Software Foundation; either version 3, or (at your option)
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9 // any later version.
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10 //
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11 // GCC is distributed in the hope that it will be useful,
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12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 // GNU General Public License for more details.
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15 //
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16 // Under Section 7 of GPL version 3, you are granted additional
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17 // permissions described in the GCC Runtime Library Exception, version
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18 // 3.1, as published by the Free Software Foundation.
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19
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20 // You should have received a copy of the GNU General Public License and
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21 // a copy of the GCC Runtime Library Exception along with this program;
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22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 // <http://www.gnu.org/licenses/>.
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24
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25 #include <bits/c++config.h>
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26 #include "unwind-cxx.h"
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27 #include "eh_atomics.h"
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28
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29 using namespace __cxxabiv1;
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30
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31
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32 static void
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33 __gxx_exception_cleanup (_Unwind_Reason_Code code, _Unwind_Exception *exc)
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34 {
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35 // This cleanup is set only for primaries.
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36 __cxa_refcounted_exception *header
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37 = __get_refcounted_exception_header_from_ue (exc);
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38
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39 // We only want to be called through _Unwind_DeleteException.
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40 // _Unwind_DeleteException in the HP-UX IA64 libunwind library
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41 // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
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42 // like the GCC _Unwind_DeleteException function does.
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43 if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
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44 __terminate (header->exc.terminateHandler);
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45
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46 if (__gnu_cxx::__eh_atomic_dec (&header->referenceCount))
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47 {
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48 if (header->exc.exceptionDestructor)
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49 header->exc.exceptionDestructor (header + 1);
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50
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51 __cxa_free_exception (header + 1);
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52 }
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53 }
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54
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55 extern "C" __cxa_refcounted_exception*
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56 __cxxabiv1::__cxa_init_primary_exception(void *obj, std::type_info *tinfo,
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57 void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
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58 {
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59 __cxa_refcounted_exception *header
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60 = __get_refcounted_exception_header_from_obj (obj);
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61 header->referenceCount = 0;
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62 header->exc.exceptionType = tinfo;
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63 header->exc.exceptionDestructor = dest;
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64 header->exc.unexpectedHandler = std::get_unexpected ();
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65 header->exc.terminateHandler = std::get_terminate ();
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66 __GXX_INIT_PRIMARY_EXCEPTION_CLASS(header->exc.unwindHeader.exception_class);
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67 header->exc.unwindHeader.exception_cleanup = __gxx_exception_cleanup;
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68
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69 return header;
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70 }
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71
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72 extern "C" void
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73 __cxxabiv1::__cxa_throw (void *obj, std::type_info *tinfo,
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74 void (_GLIBCXX_CDTOR_CALLABI *dest) (void *))
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75 {
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76 PROBE2 (throw, obj, tinfo);
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77
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78 __cxa_eh_globals *globals = __cxa_get_globals ();
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79 globals->uncaughtExceptions += 1;
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80 // Definitely a primary.
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81 __cxa_refcounted_exception *header =
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82 __cxa_init_primary_exception(obj, tinfo, dest);
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83 header->referenceCount = 1;
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84
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85 #ifdef __USING_SJLJ_EXCEPTIONS__
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86 _Unwind_SjLj_RaiseException (&header->exc.unwindHeader);
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87 #else
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88 _Unwind_RaiseException (&header->exc.unwindHeader);
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89 #endif
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90
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91 // Some sort of unwinding error. Note that terminate is a handler.
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92 __cxa_begin_catch (&header->exc.unwindHeader);
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93 std::terminate ();
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94 }
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95
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96 extern "C" void
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97 __cxxabiv1::__cxa_rethrow ()
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98 {
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99 __cxa_eh_globals *globals = __cxa_get_globals ();
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100 __cxa_exception *header = globals->caughtExceptions;
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101
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102 globals->uncaughtExceptions += 1;
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103
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104 // Watch for luser rethrowing with no active exception.
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105 if (header)
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106 {
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107 // Tell __cxa_end_catch this is a rethrow.
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108 if (!__is_gxx_exception_class(header->unwindHeader.exception_class))
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109 globals->caughtExceptions = 0;
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110 else
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111 {
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112 header->handlerCount = -header->handlerCount;
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113 // Only notify probe for C++ exceptions.
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114 PROBE2 (rethrow, __get_object_from_ambiguous_exception(header),
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115 header->exceptionType);
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116 }
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117
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118 #ifdef __USING_SJLJ_EXCEPTIONS__
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119 _Unwind_SjLj_Resume_or_Rethrow (&header->unwindHeader);
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120 #else
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121 #if defined(_LIBUNWIND_STD_ABI)
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122 _Unwind_RaiseException (&header->unwindHeader);
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123 #else
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124 _Unwind_Resume_or_Rethrow (&header->unwindHeader);
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125 #endif
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126 #endif
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127
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128 // Some sort of unwinding error. Note that terminate is a handler.
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129 __cxa_begin_catch (&header->unwindHeader);
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130 }
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131 std::terminate ();
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132 }
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