private_typeinfo.h
1 //===------------------------ private_typeinfo.h --------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef __PRIVATE_TYPEINFO_H_ 10 #define __PRIVATE_TYPEINFO_H_ 11 12 #include "__cxxabi_config.h" 13 14 #include <typeinfo> 15 #include <stddef.h> 16 17 namespace __cxxabiv1 { 18 19 class _LIBCXXABI_TYPE_VIS __shim_type_info : public std::type_info { 20 public: 21 _LIBCXXABI_HIDDEN virtual ~__shim_type_info(); 22 23 _LIBCXXABI_HIDDEN virtual void noop1() const; 24 _LIBCXXABI_HIDDEN virtual void noop2() const; 25 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *thrown_type, 26 void *&adjustedPtr) const = 0; 27 }; 28 29 class _LIBCXXABI_TYPE_VIS __fundamental_type_info : public __shim_type_info { 30 public: 31 _LIBCXXABI_HIDDEN virtual ~__fundamental_type_info(); 32 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 33 void *&) const; 34 }; 35 36 class _LIBCXXABI_TYPE_VIS __array_type_info : public __shim_type_info { 37 public: 38 _LIBCXXABI_HIDDEN virtual ~__array_type_info(); 39 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 40 void *&) const; 41 }; 42 43 class _LIBCXXABI_TYPE_VIS __function_type_info : public __shim_type_info { 44 public: 45 _LIBCXXABI_HIDDEN virtual ~__function_type_info(); 46 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 47 void *&) const; 48 }; 49 50 class _LIBCXXABI_TYPE_VIS __enum_type_info : public __shim_type_info { 51 public: 52 _LIBCXXABI_HIDDEN virtual ~__enum_type_info(); 53 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 54 void *&) const; 55 }; 56 57 enum 58 { 59 unknown = 0, 60 public_path, 61 not_public_path, 62 yes, 63 no 64 }; 65 66 class _LIBCXXABI_TYPE_VIS __class_type_info; 67 68 struct _LIBCXXABI_HIDDEN __dynamic_cast_info 69 { 70 // const data supplied to the search: 71 72 const __class_type_info* dst_type; 73 const void* static_ptr; 74 const __class_type_info* static_type; 75 ptrdiff_t src2dst_offset; 76 77 // Data that represents the answer: 78 79 // pointer to a dst_type which has (static_ptr, static_type) above it 80 const void* dst_ptr_leading_to_static_ptr; 81 // pointer to a dst_type which does not have (static_ptr, static_type) above it 82 const void* dst_ptr_not_leading_to_static_ptr; 83 84 // The following three paths are either unknown, public_path or not_public_path. 85 // access of path from dst_ptr_leading_to_static_ptr to (static_ptr, static_type) 86 int path_dst_ptr_to_static_ptr; 87 // access of path from (dynamic_ptr, dynamic_type) to (static_ptr, static_type) 88 // when there is no dst_type along the path 89 int path_dynamic_ptr_to_static_ptr; 90 // access of path from (dynamic_ptr, dynamic_type) to dst_type 91 // (not used if there is a (static_ptr, static_type) above a dst_type). 92 int path_dynamic_ptr_to_dst_ptr; 93 94 // Number of dst_types below (static_ptr, static_type) 95 int number_to_static_ptr; 96 // Number of dst_types not below (static_ptr, static_type) 97 int number_to_dst_ptr; 98 99 // Data that helps stop the search before the entire tree is searched: 100 101 // is_dst_type_derived_from_static_type is either unknown, yes or no. 102 int is_dst_type_derived_from_static_type; 103 // Number of dst_type in tree. If 0, then that means unknown. 104 int number_of_dst_type; 105 // communicates to a dst_type node that (static_ptr, static_type) was found 106 // above it. 107 bool found_our_static_ptr; 108 // communicates to a dst_type node that a static_type was found 109 // above it, but it wasn't (static_ptr, static_type) 110 bool found_any_static_type; 111 // Set whenever a search can be stopped 112 bool search_done; 113 }; 114 115 // Has no base class 116 class _LIBCXXABI_TYPE_VIS __class_type_info : public __shim_type_info { 117 public: 118 _LIBCXXABI_HIDDEN virtual ~__class_type_info(); 119 120 _LIBCXXABI_HIDDEN void process_static_type_above_dst(__dynamic_cast_info *, 121 const void *, 122 const void *, int) const; 123 _LIBCXXABI_HIDDEN void process_static_type_below_dst(__dynamic_cast_info *, 124 const void *, int) const; 125 _LIBCXXABI_HIDDEN void process_found_base_class(__dynamic_cast_info *, void *, 126 int) const; 127 _LIBCXXABI_HIDDEN virtual void search_above_dst(__dynamic_cast_info *, 128 const void *, const void *, 129 int, bool) const; 130 _LIBCXXABI_HIDDEN virtual void 131 search_below_dst(__dynamic_cast_info *, const void *, int, bool) const; 132 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 133 void *&) const; 134 _LIBCXXABI_HIDDEN virtual void 135 has_unambiguous_public_base(__dynamic_cast_info *, void *, int) const; 136 }; 137 138 // Has one non-virtual public base class at offset zero 139 class _LIBCXXABI_TYPE_VIS __si_class_type_info : public __class_type_info { 140 public: 141 const __class_type_info *__base_type; 142 143 _LIBCXXABI_HIDDEN virtual ~__si_class_type_info(); 144 145 _LIBCXXABI_HIDDEN virtual void search_above_dst(__dynamic_cast_info *, 146 const void *, const void *, 147 int, bool) const; 148 _LIBCXXABI_HIDDEN virtual void 149 search_below_dst(__dynamic_cast_info *, const void *, int, bool) const; 150 _LIBCXXABI_HIDDEN virtual void 151 has_unambiguous_public_base(__dynamic_cast_info *, void *, int) const; 152 }; 153 154 struct _LIBCXXABI_HIDDEN __base_class_type_info 155 { 156 public: 157 const __class_type_info* __base_type; 158 long __offset_flags; 159 160 enum __offset_flags_masks 161 { 162 __virtual_mask = 0x1, 163 __public_mask = 0x2, // base is public 164 __offset_shift = 8 165 }; 166 167 void search_above_dst(__dynamic_cast_info*, const void*, const void*, int, bool) const; 168 void search_below_dst(__dynamic_cast_info*, const void*, int, bool) const; 169 void has_unambiguous_public_base(__dynamic_cast_info*, void*, int) const; 170 }; 171 172 // Has one or more base classes 173 class _LIBCXXABI_TYPE_VIS __vmi_class_type_info : public __class_type_info { 174 public: 175 unsigned int __flags; 176 unsigned int __base_count; 177 __base_class_type_info __base_info[1]; 178 179 enum __flags_masks { 180 __non_diamond_repeat_mask = 0x1, // has two or more distinct base class 181 // objects of the same type 182 __diamond_shaped_mask = 0x2 // has base class object with two or 183 // more derived objects 184 }; 185 186 _LIBCXXABI_HIDDEN virtual ~__vmi_class_type_info(); 187 188 _LIBCXXABI_HIDDEN virtual void search_above_dst(__dynamic_cast_info *, 189 const void *, const void *, 190 int, bool) const; 191 _LIBCXXABI_HIDDEN virtual void 192 search_below_dst(__dynamic_cast_info *, const void *, int, bool) const; 193 _LIBCXXABI_HIDDEN virtual void 194 has_unambiguous_public_base(__dynamic_cast_info *, void *, int) const; 195 }; 196 197 class _LIBCXXABI_TYPE_VIS __pbase_type_info : public __shim_type_info { 198 public: 199 unsigned int __flags; 200 const __shim_type_info *__pointee; 201 202 enum __masks { 203 __const_mask = 0x1, 204 __volatile_mask = 0x2, 205 __restrict_mask = 0x4, 206 __incomplete_mask = 0x8, 207 __incomplete_class_mask = 0x10, 208 __transaction_safe_mask = 0x20, 209 // This implements the following proposal from cxx-abi-dev (not yet part of 210 // the ABI document): 211 // 212 // http://sourcerytools.com/pipermail/cxx-abi-dev/2016-October/002986.html 213 // 214 // This is necessary for support of http://wg21.link/p0012, which permits 215 // throwing noexcept function and member function pointers and catching 216 // them as non-noexcept pointers. 217 __noexcept_mask = 0x40, 218 219 // Flags that cannot be removed by a standard conversion. 220 __no_remove_flags_mask = __const_mask | __volatile_mask | __restrict_mask, 221 // Flags that cannot be added by a standard conversion. 222 __no_add_flags_mask = __transaction_safe_mask | __noexcept_mask 223 }; 224 225 _LIBCXXABI_HIDDEN virtual ~__pbase_type_info(); 226 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 227 void *&) const; 228 }; 229 230 class _LIBCXXABI_TYPE_VIS __pointer_type_info : public __pbase_type_info { 231 public: 232 _LIBCXXABI_HIDDEN virtual ~__pointer_type_info(); 233 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 234 void *&) const; 235 _LIBCXXABI_HIDDEN bool can_catch_nested(const __shim_type_info *) const; 236 }; 237 238 class _LIBCXXABI_TYPE_VIS __pointer_to_member_type_info 239 : public __pbase_type_info { 240 public: 241 const __class_type_info *__context; 242 243 _LIBCXXABI_HIDDEN virtual ~__pointer_to_member_type_info(); 244 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *, 245 void *&) const; 246 _LIBCXXABI_HIDDEN bool can_catch_nested(const __shim_type_info *) const; 247 }; 248 249 } // __cxxabiv1 250 251 #endif // __PRIVATE_TYPEINFO_H_