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

   1 // Boilerplate support routines for -*- C++ -*- dynamic memory management.
   2
   3 // Copyright (C) 1997-2018 Free Software Foundation, Inc.
   4 //
   5 // This file is part of GCC.
   6 //
   7 // GCC is free software; you can redistribute it and/or modify
   8 // it under the terms of the GNU General Public License as published by
   9 // the Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11 //
  12 // GCC is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16 //
  17 // Under Section 7 of GPL version 3, you are granted additional
  18 // permissions described in the GCC Runtime Library Exception, version
  19 // 3.1, as published by the Free Software Foundation.
  20
  21 // You should have received a copy of the GNU General Public License and
  22 // a copy of the GCC Runtime Library Exception along with this program;
  23 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 // <http://www.gnu.org/licenses/>.
  25
  26 #include <bits/c++config.h>
  27
  28 #if !_GLIBCXX_HOSTED
  29 // A freestanding C runtime may not provide "free" -- but there is no
  30 // other reasonable way to implement "operator delete".
  31 namespace std
  32 {
  33 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  34   extern "C" void free(void*);
  35 _GLIBCXX_END_NAMESPACE_VERSION
  36 } // namespace
  37 #else
  38 # include <cstdlib>
  39 #endif
  40
  41 #include "new"
  42
  43 // The sized deletes are defined in other files.
  44 #pragma GCC diagnostic ignored "-Wsized-deallocation"
  45
  46 _GLIBCXX_WEAK_DEFINITION void
  47 operator delete(void* ptr, std::align_val_t) noexcept
  48 {
  49 #if _GLIBCXX_HAVE_ALIGNED_ALLOC || _GLIBCXX_HAVE_POSIX_MEMALIGN \
  50     || _GLIBCXX_HAVE_MEMALIGN
  51   std::free (ptr);
  52 #elif _GLIBCXX_HAVE__ALIGNED_MALLOC
  53   _aligned_free (ptr);
  54 #else
  55   if (ptr)
  56     std::free (((void **) ptr)[-1]); // See aligned_alloc in new_opa.cc
  57 #endif
  58 }