libstdc++-v3/libsupc++/eh_exception.cc

   1 // -*- C++ -*- std::exception implementation.
   2 // Copyright (C) 1994-2023 Free Software Foundation, Inc.
   3 //
   4 // This file is part of GCC.
   5 //
   6 // GCC is free software; you can redistribute it and/or modify
   7 // it under the terms of the GNU General Public License as published by
   8 // the Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10 //
  11 // GCC is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15 //
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #include "typeinfo"
  26 #include "exception"
  27 #include <cxxabi.h>
  28
  29 std::exception::~exception() _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT { }
  30
  31 std::bad_exception::~bad_exception() _GLIBCXX_TXN_SAFE_DYN
  32     _GLIBCXX_USE_NOEXCEPT
  33 { }
  34
  35 abi::__forced_unwind::~__forced_unwind() throw() { }
  36
  37 abi::__foreign_exception::~__foreign_exception() throw() { }
  38
  39 const char*
  40 std::exception::what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT
  41 {
  42   // NB: Another elegant option would be returning typeid(*this).name()
  43   // and not overriding what() in bad_exception, bad_alloc, etc.  In
  44   // that case, however, mangled names would be returned, PR 14493.
  45   return "std::exception";
  46 }
  47
  48 const char*
  49 std::bad_exception::what() const _GLIBCXX_TXN_SAFE_DYN _GLIBCXX_USE_NOEXCEPT
  50 {
  51   return "std::bad_exception";
  52 }
  53
  54 // Transactional clones for the destructors and what().
  55 // what() is effectively transaction_pure, but we do not want to annotate it
  56 // as such; thus, we call exactly the respective nontransactional function.
  57 extern "C" {
  58
  59 void
  60 _ZGTtNKSt9exceptionD1Ev(const std::exception*)
  61 { }
  62
  63 const char*
  64 _ZGTtNKSt9exception4whatEv(const std::exception* that)
  65 {
  66   // We really want the non-virtual call here.  We already executed the
  67   // indirect call representing the virtual call, and the TM runtime or the
  68   // compiler resolved it to this transactional clone.  In the clone, we want
  69   // to do the same as for the nontransactional original, so we just call it.
  70   return that->std::exception::what();
  71 }
  72
  73 void
  74 _ZGTtNKSt13bad_exceptionD1Ev(
  75     const std::bad_exception*)
  76 { }
  77
  78 const char*
  79 _ZGTtNKSt13bad_exception4whatEv(
  80     const std::bad_exception* that)
  81 {
  82   // Also see _ZGTtNKSt9exception4whatEv.
  83   return that->std::bad_exception::what();
  84 }
  85
  86 }