gcc/cp/new1.cc

   1 // Support routines for the -*- C++ -*- dynamic memory management.
   2 // Copyright (C) 1997, 1998, 1999 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 using std::new_handler;
  30 using std::bad_alloc;
  31
  32 extern "C" void *malloc (size_t);
  33 extern new_handler __new_handler;
  34
  35 #define WEAK(x) \
  36   x __attribute__ ((weak)); \
  37   x
  38
  39 #ifdef L_op_newnt
  40 WEAK (void * operator new (size_t sz, const std::nothrow_t&) throw())
  41 {
  42   void *p;
  43
  44   /* malloc (0) is unpredictable; avoid it.  */
  45   if (sz == 0)
  46     sz = 1;
  47   p = (void *) malloc (sz);
  48   while (p == 0)
  49     {
  50       new_handler handler = __new_handler;
  51       if (! handler)
  52         return 0;
  53       try
  54         {
  55           handler ();
  56         }
  57       catch (bad_alloc &)
  58         {
  59           return 0;
  60         }
  61
  62       p = (void *) malloc (sz);
  63     }
  64
  65   return p;
  66 }
  67 #endif
  68
  69 #ifdef L_op_new
  70 WEAK (void * operator new (size_t sz) throw (std::bad_alloc))
  71 {
  72   void *p;
  73
  74   /* malloc (0) is unpredictable; avoid it.  */
  75   if (sz == 0)
  76     sz = 1;
  77   p = (void *) malloc (sz);
  78   while (p == 0)
  79     {
  80       new_handler handler = __new_handler;
  81       if (! handler)
  82         throw bad_alloc ();
  83       handler ();
  84       p = (void *) malloc (sz);
  85     }
  86
  87   return p;
  88 }
  89 #endif