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  1. // Support routines for the -*- C++ -*- dynamic memory management.
  2.  
  3. // Copyright (C) 1997-2015 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. #include <cstdlib>
  28. #include <bits/exception_defines.h>
  29. #include "new"
  30.  
  31. using std::new_handler;
  32. using std::bad_alloc;
  33. #if _GLIBCXX_HOSTED
  34. using std::malloc;
  35. #else
  36. // A freestanding C runtime may not provide "malloc" -- but there is no
  37. // other reasonable way to implement "operator new".
  38. extern "C" void *malloc (std::size_t);
  39. #endif
  40.  
  41. _GLIBCXX_WEAK_DEFINITION void *
  42. operator new (std::size_t sz) _GLIBCXX_THROW (std::bad_alloc)
  43. {
  44.   void *p;
  45.  
  46.   /* malloc (0) is unpredictable; avoid it.  */
  47.   if (sz == 0)
  48.     sz = 1;
  49.  
  50.   while (__builtin_expect ((p = malloc (sz)) == 0, false))
  51.     {
  52.       new_handler handler = std::get_new_handler ();
  53.       if (! handler)
  54.         _GLIBCXX_THROW_OR_ABORT(bad_alloc());
  55.       handler ();
  56.     }
  57.  
  58.   return p;
  59. }
  60.