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 42 namespace std 43 { 44 struct nothrow_t {}; 45 } 46 47 48 /// The type of the function called when allocation fails. 49 typedef 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 */ 54 static atomic<new_handler> new_handl{nullptr}; 55 56 namespace 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 new_handl.exchange(handler); 65 } 66 67 __attribute__((weak)) 68 new_handler get_new_handler(void) 69 { 70 return new_handl.load(); 71 } 72 } 73 74 75 #if __cplusplus < 201103L 76 #define NOEXCEPT throw() 77 #define BADALLOC throw(std::bad_alloc) 78 #else 79 #define NOEXCEPT noexcept 80 #define BADALLOC 81 #endif 82 83 namespace 84 { 85 /** 86 * Helper for forwarding from no-throw operators to versions that can 87 * return nullptr. Catches any exception and converts it into a nullptr 88 * return. 89 */ 90 template<void*(New)(size_t)> 91 void *noexcept_new(size_t size) 92 { 93 #if !defined(_CXXRT_NO_EXCEPTIONS) 94 try 95 { 96 return New(size); 97 } catch (...) 98 { 99 // nothrow operator new should return NULL in case of 100 // std::bad_alloc exception in new handler 101 return nullptr; 102 } 103 #else 104 return New(size); 105 #endif 106 } 107 } 108 109 110 __attribute__((weak)) 111 void* operator new(size_t size) BADALLOC 112 { 113 if (0 == size) 114 { 115 size = 1; 116 } 117 void * mem = malloc(size); 118 while (0 == mem) 119 { 120 new_handler h = std::get_new_handler(); 121 if (0 != h) 122 { 123 h(); 124 } 125 else 126 { 127 #if !defined(_CXXRT_NO_EXCEPTIONS) 128 throw std::bad_alloc(); 129 #else 130 break; 131 #endif 132 } 133 mem = malloc(size); 134 } 135 136 return mem; 137 } 138 139 140 __attribute__((weak)) 141 void* operator new(size_t size, const std::nothrow_t &) NOEXCEPT 142 { 143 return noexcept_new<(::operator new)>(size); 144 } 145 146 147 __attribute__((weak)) 148 void operator delete(void * ptr) NOEXCEPT 149 { 150 free(ptr); 151 } 152 153 154 __attribute__((weak)) 155 void * operator new[](size_t size) BADALLOC 156 { 157 return ::operator new(size); 158 } 159 160 161 __attribute__((weak)) 162 void * operator new[](size_t size, const std::nothrow_t &) NOEXCEPT 163 { 164 return noexcept_new<(::operator new[])>(size); 165 } 166 167 168 __attribute__((weak)) 169 void operator delete[](void * ptr) NOEXCEPT 170 { 171 ::operator delete(ptr); 172 } 173 174 // C++14 additional delete operators 175 176 #if __cplusplus >= 201402L 177 178 __attribute__((weak)) 179 void operator delete(void * ptr, size_t) NOEXCEPT 180 { 181 ::operator delete(ptr); 182 } 183 184 185 __attribute__((weak)) 186 void operator delete[](void * ptr, size_t) NOEXCEPT 187 { 188 ::operator delete(ptr); 189 } 190 191 #endif 192