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