1 // Support routines for the -*- C++ -*- dynamic memory management. 2 3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2009, 2011 4 // Free Software Foundation 5 // 6 // This file is part of GCC. 7 // 8 // GCC is free software; you can redistribute it and/or modify 9 // it under the terms of the GNU General Public License as published by 10 // the Free Software Foundation; either version 3, or (at your option) 11 // any later version. 12 // 13 // GCC is distributed in the hope that it will be useful, 14 // but WITHOUT ANY WARRANTY; without even the implied warranty of 15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 // GNU General Public License for more details. 17 // 18 // Under Section 7 of GPL version 3, you are granted additional 19 // permissions described in the GCC Runtime Library Exception, version 20 // 3.1, as published by the Free Software Foundation. 21 22 // You should have received a copy of the GNU General Public License and 23 // a copy of the GCC Runtime Library Exception along with this program; 24 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 25 // <http://www.gnu.org/licenses/>. 26 27 #include <bits/c++config.h> 28 #include <cstdlib> 29 #include <bits/exception_defines.h> 30 #include "new" 31 32 using std::new_handler; 33 using std::bad_alloc; 34 #if _GLIBCXX_HOSTED 35 using std::malloc; 36 #else 37 // A freestanding C runtime may not provide "malloc" -- but there is no 38 // other reasonable way to implement "operator new". 39 extern "C" void *malloc (std::size_t); 40 #endif 41 42 extern new_handler __new_handler; 43 44 _GLIBCXX_WEAK_DEFINITION void * 45 operator new (std::size_t sz) _GLIBCXX_THROW (std::bad_alloc) 46 { 47 void *p; 48 49 /* malloc (0) is unpredictable; avoid it. */ 50 if (sz == 0) 51 sz = 1; 52 p = (void *) malloc (sz); 53 while (p == 0) 54 { 55 new_handler handler = __new_handler; 56 if (! handler) 57 #ifdef __EXCEPTIONS 58 throw bad_alloc(); 59 #else 60 std::abort(); 61 #endif 62 handler (); 63 p = (void *) malloc (sz); 64 } 65 66 return p; 67 } 68