1 // Support routines for the -*- C++ -*- dynamic memory management. 2 3 // Copyright (C) 1997-2018 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 (sz == 0) 48 sz = 1; 49 50 while (__builtin_expect ((p = malloc (sz)) == 0, false)) 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