gcc/cp/new1.cc

   1 // Support routines for the -*- C++ -*- dynamic memory management.
   2 // Copyright (C) 1997, 1998, 1999, 2000 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, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 #include "new"
  31 using std::new_handler;
  32 using std::bad_alloc;
  33
  34 extern "C" void *malloc (size_t);
  35 extern new_handler __new_handler;
  36
  37 #define WEAK(x) \
  38   x __attribute__ ((weak)); \
  39   x
  40
  41 #ifdef L_op_newnt
  42 WEAK (void * operator new (size_t sz, const std::nothrow_t&) throw())
  43 {
  44   void *p;
  45
  46   /* malloc (0) is unpredictable; avoid it.  */
  47   if (sz == 0)
  48     sz = 1;
  49   p = (void *) malloc (sz);
  50   while (p == 0)
  51     {
  52       new_handler handler = __new_handler;
  53       if (! handler)
  54         return 0;
  55       try
  56         {
  57           handler ();
  58         }
  59       catch (bad_alloc &)
  60         {
  61           return 0;
  62         }
  63
  64       p = (void *) malloc (sz);
  65     }
  66
  67   return p;
  68 }
  69 #endif
  70
  71 #ifdef L_op_new
  72 WEAK (void * operator new (size_t sz) throw (std::bad_alloc))
  73 {
  74   void *p;
  75
  76   /* malloc (0) is unpredictable; avoid it.  */
  77   if (sz == 0)
  78     sz = 1;
  79   p = (void *) malloc (sz);
  80   while (p == 0)
  81     {
  82       new_handler handler = __new_handler;
  83       if (! handler)
  84         throw bad_alloc ();
  85       handler ();
  86       p = (void *) malloc (sz);
  87     }
  88
  89   return p;
  90 }
  91 #endif