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1 // -*- C++ -*- Exception handling routines for Transactional Memory.
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2 // Copyright (C) 2009-2020 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 <cstdlib>
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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 // Free one C++ exception.
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32
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33 static void
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34 free_any_cxa_exception (_Unwind_Exception *eo)
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35 {
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36 __cxa_refcounted_exception *h
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37 = __get_refcounted_exception_header_from_ue (eo);
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38
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39 if (__is_dependent_exception (eo->exception_class))
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40 {
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41 __cxa_dependent_exception *dep
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42 = __get_dependent_exception_from_ue (eo);
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43
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44 h = __get_refcounted_exception_header_from_obj (dep->primaryException);
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45
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46 __cxa_free_dependent_exception (dep);
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47 }
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48
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49 if (__gnu_cxx::__eh_atomic_dec (&h->referenceCount))
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50 __cxa_free_exception (h + 1);
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51 }
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52
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53 // Cleanup exception handling state while rolling back state for
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54 // a software transactional memory transaction.
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55 //
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56 // UNTHROWN_OBJ is non-null if we've called __cxa_allocate_exception
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57 // but not yet called __cxa_throw for it.
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58 //
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59 // CLEANUP_EXC is non-null if we're currently processing a cleanup
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60 // along an exception path, but we've not caught the exception yet.
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61 //
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62 // CAUGHT_COUNT is the nesting depth of __cxa_begin_catch within
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63 // the transaction; undo as if calling __cxa_end_catch that many times.
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64
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65 extern "C" void
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66 __cxxabiv1::__cxa_tm_cleanup (void *unthrown_obj,
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67 void *cleanup_exc,
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68 unsigned int caught_count) throw()
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69 {
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70 __cxa_eh_globals *globals = __cxa_get_globals_fast ();
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71
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72 // Handle a C++ exception not yet thrown.
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73 if (unthrown_obj)
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74 {
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75 globals->uncaughtExceptions -= 1;
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76 __cxa_free_exception (unthrown_obj);
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77 }
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78
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79 // Handle an exception not yet caught ie. processing a cleanup
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80 // in between the throw and the catch.
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81 if (cleanup_exc)
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82 {
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83 _Unwind_Exception *eo
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84 = reinterpret_cast <_Unwind_Exception *>(cleanup_exc);
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85 if (__is_gxx_exception_class (eo->exception_class))
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86 free_any_cxa_exception (eo);
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87 else
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88 _Unwind_DeleteException (eo);
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89 }
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90
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91 // Do __cxa_end_catch caught_count times, but don't bother running
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92 // the destructors for the objects involved. All of that is being
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93 // undone by the transaction restart.
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94 if (caught_count > 0)
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95 {
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96 __cxa_exception *h = globals->caughtExceptions;
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97
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98 // Rethrown foreign exceptions are removed from the stack immediately.
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99 // We would have freed this exception via THIS_EXC above.
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100 if (h == NULL)
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101 return;
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102
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103 do
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104 {
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105 __cxa_exception *next;
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106 _Unwind_Exception *eo = &h->unwindHeader;
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107
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108 if (__is_gxx_exception_class (eo->exception_class))
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109 {
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110 next = h->nextException;
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111 free_any_cxa_exception (eo);
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112 }
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113 else
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114 {
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115 _Unwind_DeleteException (eo);
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116 next = 0;
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117 }
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118
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119 h = next;
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120 }
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121 while (--caught_count);
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122
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123 globals->caughtExceptions = h;
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124 }
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125 }
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