1 // Common/NewHandler.h 2 3 #ifndef ZIP7_INC_COMMON_NEW_HANDLER_H 4 #define ZIP7_INC_COMMON_NEW_HANDLER_H 5 6 /* 7 NewHandler.h and NewHandler.cpp allows to solve problem with compilers that 8 don't throw exception in operator new(). 9 10 This file must be included before any code that uses operators new() or delete() 11 and you must compile and link "NewHandler.cpp", if you use some old MSVC compiler. 12 13 DOCs: 14 Since ISO C++98, operator new throws std::bad_alloc when memory allocation fails. 15 MSVC 6.0 returned a null pointer on an allocation failure. 16 Beginning in VS2002, operator new conforms to the standard and throws on failure. 17 18 By default, the compiler also generates defensive null checks to prevent 19 these older-style allocators from causing an immediate crash on failure. 20 The /Zc:throwingNew option tells the compiler to leave out these null checks, 21 on the assumption that all linked memory allocators conform to the standard. 22 23 The operator new() in some MSVC versions doesn't throw exception std::bad_alloc. 24 MSVC 6.0 (_MSC_VER == 1200) doesn't throw exception. 25 The code produced by some another MSVC compilers also can be linked 26 to library that doesn't throw exception. 27 We suppose that code compiled with VS2015+ (_MSC_VER >= 1900) throws exception std::bad_alloc. 28 For older _MSC_VER versions we redefine operator new() and operator delete(). 29 Our version of operator new() throws CNewException() exception on failure. 30 31 It's still allowed to use redefined version of operator new() from "NewHandler.cpp" 32 with any compiler. 7-Zip's code can work with std::bad_alloc and CNewException() exceptions. 33 But if you use some additional code (outside of 7-Zip's code), you must check 34 that redefined version of operator new() is not problem for your code. 35 */ 36 37 #include <stddef.h> 38 39 #ifdef _WIN32 40 // We can compile my_new and my_delete with _fastcall 41 /* 42 void * my_new(size_t size); 43 void my_delete(void *p) throw(); 44 // void * my_Realloc(void *p, size_t newSize, size_t oldSize); 45 */ 46 #endif 47 48 49 #if defined(_MSC_VER) && (_MSC_VER < 1600) 50 // If you want to use default operator new(), you can disable the following line 51 #define Z7_REDEFINE_OPERATOR_NEW 52 #endif 53 54 55 #ifdef Z7_REDEFINE_OPERATOR_NEW 56 57 // std::bad_alloc can require additional DLL dependency. 58 // So we don't define CNewException as std::bad_alloc here. 59 60 class CNewException {}; 61 62 void * 63 #ifdef _MSC_VER 64 __cdecl 65 #endif 66 operator new(size_t size); 67 68 /* 69 #if 0 && defined(_MSC_VER) && _MSC_VER == 1600 70 #define Z7_OPERATOR_DELETE_SPEC_THROW0 71 #else 72 #define Z7_OPERATOR_DELETE_SPEC_THROW0 throw() 73 #endif 74 */ 75 #if defined(_MSC_VER) && _MSC_VER == 1600 76 #pragma warning(push) 77 #pragma warning(disable : 4986) // 'operator delete': exception specification does not match previous declaration 78 #endif 79 80 void 81 #ifdef _MSC_VER 82 __cdecl 83 #endif 84 operator delete(void *p) throw(); 85 86 void 87 #ifdef _MSC_VER 88 __cdecl 89 #endif 90 operator delete(void *p, size_t n) throw(); 91 92 #if defined(_MSC_VER) && _MSC_VER == 1600 93 #pragma warning(pop) 94 #endif 95 96 97 #else 98 99 #include <new> 100 101 #define CNewException std::bad_alloc 102 103 #endif 104 105 /* 106 #ifdef _WIN32 107 void * 108 #ifdef _MSC_VER 109 __cdecl 110 #endif 111 operator new[](size_t size); 112 113 void 114 #ifdef _MSC_VER 115 __cdecl 116 #endif 117 operator delete[](void *p) throw(); 118 #endif 119 */ 120 121 #endif 122