1/* 2 * Copyright 2010-2011 PathScale, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * 1. Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS 15 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 16 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27/** 28 * memory.cc - Contains stub definition of C++ new/delete operators. 29 * 30 * These definitions are intended to be used for testing and are weak symbols 31 * to allow them to be replaced by definitions from a STL implementation. 32 * These versions simply wrap malloc() and free(), they do not provide a 33 * C++-specific allocator. 34 */ 35 36#include <stddef.h> 37#include <stdlib.h> 38#include "stdexcept.h" 39#include "atomic.h" 40 41 42namespace std 43{ 44 struct nothrow_t {}; 45} 46 47 48/// The type of the function called when allocation fails. 49typedef void (*new_handler)(); 50/** 51 * The function to call when allocation fails. By default, there is no 52 * handler and a bad allocation exception is thrown if an allocation fails. 53 */ 54static new_handler new_handl; 55 56namespace std 57{ 58 /** 59 * Sets a function to be called when there is a failure in new. 60 */ 61 __attribute__((weak)) 62 new_handler set_new_handler(new_handler handler) 63 { 64 return ATOMIC_SWAP(&new_handl, handler); 65 } 66 __attribute__((weak)) 67 new_handler get_new_handler(void) 68 { 69 return ATOMIC_LOAD(&new_handl); 70 } 71} 72 73 74#if __cplusplus < 201103L 75#define NOEXCEPT throw() 76#define BADALLOC throw(std::bad_alloc) 77#else 78#define NOEXCEPT noexcept 79#define BADALLOC 80#endif 81 82 83__attribute__((weak)) 84void* operator new(size_t size) BADALLOC 85{ 86 if (0 == size) 87 { 88 size = 1; 89 } 90 void * mem = malloc(size); 91 while (0 == mem) 92 { 93 new_handler h = std::get_new_handler(); 94 if (0 != h) 95 { 96 h(); 97 } 98 else 99 { 100 throw std::bad_alloc(); 101 } 102 mem = malloc(size); 103 } 104 105 return mem; 106} 107 108__attribute__((weak)) 109void* operator new(size_t size, const std::nothrow_t &) NOEXCEPT 110{ 111 try { 112 return :: operator new(size); 113 } catch (...) { 114 // nothrow operator new should return NULL in case of 115 // std::bad_alloc exception in new handler 116 return NULL; 117 } 118} 119 120 121__attribute__((weak)) 122void operator delete(void * ptr) NOEXCEPT 123{ 124 free(ptr); 125} 126 127 128__attribute__((weak)) 129void * operator new[](size_t size) BADALLOC 130{ 131 return ::operator new(size); 132} 133 134 135__attribute__((weak)) 136void * operator new[](size_t size, const std::nothrow_t &) NOEXCEPT 137{ 138 try { 139 return ::operator new[](size); 140 } catch (...) { 141 // nothrow operator new should return NULL in case of 142 // std::bad_alloc exception in new handler 143 return NULL; 144 } 145} 146 147 148__attribute__((weak)) 149void operator delete[](void * ptr) NOEXCEPT 150{ 151 ::operator delete(ptr); 152} 153 154// C++14 additional delete operators 155 156#if __cplusplus >= 201402L 157 158__attribute__((weak)) 159void operator delete(void * ptr, size_t) NOEXCEPT 160{ 161 ::operator delete(ptr); 162} 163 164 165__attribute__((weak)) 166void operator delete[](void * ptr, size_t) NOEXCEPT 167{ 168 ::operator delete(ptr); 169} 170 171#endif 172