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

   1 // Support routines for the -*- C++ -*- dynamic memory management.
   2 // Copyright (C) 1997-2024 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 <bits/c++config.h>
  26 #include <bits/exception_defines.h>
  27 #include "new"
  28
  29 extern "C" void *malloc (std::size_t);
  30
  31 _GLIBCXX_WEAK_DEFINITION void *
  32 operator new (std::size_t sz, const std::nothrow_t&) noexcept
  33 {
  34   // _GLIBCXX_RESOLVE_LIB_DEFECTS
  35   // 206. operator new(size_t, nothrow) may become unlinked to ordinary
  36   // operator new if ordinary version replaced
  37   __try
  38     {
  39       return ::operator new(sz);
  40     }
  41   __catch (...)
  42     {
  43       // N.B. catch (...) means the process will terminate if operator new(sz)
  44       // exits with a __forced_unwind exception. The process will print
  45       // "FATAL: exception not rethrown" to stderr before exiting.
  46       //
  47       // If we propagated that exception the process would still terminate
  48       // (because this function is noexcept) but with a less informative error:
  49       // "terminate called without active exception".
  50       return nullptr;
  51     }
  52 }