1 // The -*- C++ -*- dynamic memory management header. 2 3 // Copyright (C) 1994-2014 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 /** @file new 27 * This is a Standard C++ Library header. 28 * 29 * The header @c new defines several functions to manage dynamic memory and 30 * handling memory allocation errors; see 31 * http://gcc.gnu.org/onlinedocs/libstdc++/18_support/howto.html#4 for more. 32 */ 33 34 #ifndef _NEW 35 #define _NEW 36 37 #pragma GCC system_header 38 39 #include <bits/c++config.h> 40 #include <exception> 41 42 #pragma GCC visibility push(default) 43 44 extern "C++" { 45 46 namespace std 47 { 48 /** 49 * @brief Exception possibly thrown by @c new. 50 * @ingroup exceptions 51 * 52 * @c bad_alloc (or classes derived from it) is used to report allocation 53 * errors from the throwing forms of @c new. */ 54 class bad_alloc : public exception 55 { 56 public: 57 bad_alloc() throw() { } 58 59 // This declaration is not useless: 60 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 61 virtual ~bad_alloc() throw(); 62 63 // See comment in eh_exception.cc. 64 virtual const char* what() const throw(); 65 }; 66 67 #if __cplusplus >= 201103L 68 class bad_array_new_length : public bad_alloc 69 { 70 public: 71 bad_array_new_length() throw() { }; 72 73 // This declaration is not useless: 74 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 75 virtual ~bad_array_new_length() throw(); 76 77 // See comment in eh_exception.cc. 78 virtual const char* what() const throw(); 79 }; 80 #endif 81 82 // We throw this exception for GNU VLAs of negative length in all C++ 83 // dialects, so declare it if we aren't in strict conformance mode. 84 #if __cplusplus > 201103L || !defined(__STRICT_ANSI__) 85 class bad_array_length : public bad_alloc 86 { 87 public: 88 bad_array_length() throw() { }; 89 90 // This declaration is not useless: 91 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 92 virtual ~bad_array_length() throw(); 93 94 // See comment in eh_exception.cc. 95 virtual const char* what() const throw(); 96 }; 97 #endif 98 99 struct nothrow_t { }; 100 101 extern const nothrow_t nothrow; 102 103 /** If you write your own error handler to be called by @c new, it must 104 * be of this type. */ 105 typedef void (*new_handler)(); 106 107 /// Takes a replacement handler as the argument, returns the 108 /// previous handler. 109 new_handler set_new_handler(new_handler) throw(); 110 111 #if __cplusplus >= 201103L 112 /// Return the current new handler. 113 new_handler get_new_handler() noexcept; 114 #endif 115 } // namespace std 116 117 //@{ 118 /** These are replaceable signatures: 119 * - normal single new and delete (no arguments, throw @c bad_alloc on error) 120 * - normal array new and delete (same) 121 * - @c nothrow single new and delete (take a @c nothrow argument, return 122 * @c NULL on error) 123 * - @c nothrow array new and delete (same) 124 * 125 * Placement new and delete signatures (take a memory address argument, 126 * does nothing) may not be replaced by a user's program. 127 */ 128 void* operator new(std::size_t) _GLIBCXX_THROW (std::bad_alloc) 129 __attribute__((__externally_visible__)); 130 void* operator new[](std::size_t) _GLIBCXX_THROW (std::bad_alloc) 131 __attribute__((__externally_visible__)); 132 void operator delete(void*) _GLIBCXX_USE_NOEXCEPT 133 __attribute__((__externally_visible__)); 134 void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT 135 __attribute__((__externally_visible__)); 136 void* operator new(std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 137 __attribute__((__externally_visible__)); 138 void* operator new[](std::size_t, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 139 __attribute__((__externally_visible__)); 140 void operator delete(void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 141 __attribute__((__externally_visible__)); 142 void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT 143 __attribute__((__externally_visible__)); 144 145 // Default placement versions of operator new. 146 inline void* operator new(std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 147 { return __p; } 148 inline void* operator new[](std::size_t, void* __p) _GLIBCXX_USE_NOEXCEPT 149 { return __p; } 150 151 // Default placement versions of operator delete. 152 inline void operator delete (void*, void*) _GLIBCXX_USE_NOEXCEPT { } 153 inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { } 154 //@} 155 } // extern "C++" 156 157 #pragma GCC visibility pop 158 159 #endif 160
