gcc/cp/new1.cc

   1 // Support routine for the -*- C++ -*- dynamic memory management.
   2 // Copyright (C) 1997 Free Software Foundation
   3
   4 // This file is part of GNU CC.
   5
   6 // GNU CC 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 2, or (at your option)
   9 // any later version.
  10
  11 // GNU CC 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 // You should have received a copy of the GNU General Public License
  17 // along with GNU CC; see the file COPYING.  If not, write to
  18 // the Free Software Foundation, 59 Temple Place - Suite 330,
  19 // Boston, MA 02111-1307, USA.
  20
  21 // As a special exception, if you link this library with other files,
  22 // some of which are compiled with GCC, to produce an executable,
  23 // this library does not by itself cause the resulting executable
  24 // to be covered by the GNU General Public License.
  25 // This exception does not however invalidate any other reasons why
  26 // the executable file might be covered by the GNU General Public License.
  27
  28 #include "new"
  29
  30 extern "C" void *malloc (size_t);
  31
  32 typedef void (*vfp)(void);
  33 extern vfp __new_handler;
  34 extern void __default_new_handler (void);
  35
  36 void *operator new (size_t sz, const nothrow_t&) throw()
  37 {
  38   void *p;
  39   vfp handler = __new_handler;
  40
  41   /* malloc (0) is unpredictable; avoid it.  */
  42   if (sz == 0)
  43     sz = 1;
  44   p = (void *) malloc (sz);
  45   while (p == 0)
  46     {
  47       if (! handler)
  48         return 0;
  49       (*handler) ();
  50       p = (void *) malloc (sz);
  51     }
  52
  53   return p;
  54 }