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      1 // Support routines for the -*- C++ -*- dynamic memory management.
      2 
      3 // Copyright (C) 1997-2024 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 (__builtin_expect (sz == 0, false))
     48     sz = 1;
     49 
     50   while ((p = malloc (sz)) == 0)
     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