// RTTI support internals for -*- C++ -*- // Copyright (C) 1994-2021 Free Software Foundation, Inc. // This file is part of GCC. // // GCC is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; either version 3, or (at your option) // any later version. // GCC is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // . #include "typeinfo" #include // Class declarations shared between the typeinfo implementation files. #include namespace __cxxabiv1 { namespace { using namespace std; using namespace abi; // Initial part of a vtable, this structure is used with offsetof, so we don't // have to keep alignments consistent manually. struct vtable_prefix { // Offset to most derived object. ptrdiff_t whole_object; // Additional padding if necessary. #ifdef _GLIBCXX_VTABLE_PADDING ptrdiff_t padding1; #endif // Pointer to most derived type_info. const __class_type_info *whole_type; // Additional padding if necessary. #ifdef _GLIBCXX_VTABLE_PADDING ptrdiff_t padding2; #endif // What a class's vptr points to. const void *origin; }; template inline const T * adjust_pointer (const void *base, ptrdiff_t offset) { return reinterpret_cast (reinterpret_cast (base) + offset); } // ADDR is a pointer to an object. Convert it to a pointer to a base, // using OFFSET. IS_VIRTUAL is true, if we are getting a virtual base. inline void const * convert_to_base (void const *addr, bool is_virtual, ptrdiff_t offset) { if (is_virtual) { const void *vtable = *static_cast (addr); offset = *adjust_pointer (vtable, offset); } return adjust_pointer (addr, offset); } // some predicate functions for __class_type_info::__sub_kind inline bool contained_p (__class_type_info::__sub_kind access_path) { return access_path >= __class_type_info::__contained_mask; } inline bool public_p (__class_type_info::__sub_kind access_path) { return access_path & __class_type_info::__contained_public_mask; } inline bool virtual_p (__class_type_info::__sub_kind access_path) { return (access_path & __class_type_info::__contained_virtual_mask); } inline bool contained_public_p (__class_type_info::__sub_kind access_path) { return ((access_path & __class_type_info::__contained_public) == __class_type_info::__contained_public); } inline bool contained_nonpublic_p (__class_type_info::__sub_kind access_path) { return ((access_path & __class_type_info::__contained_public) == __class_type_info::__contained_mask); } inline bool contained_nonvirtual_p (__class_type_info::__sub_kind access_path) { return ((access_path & (__class_type_info::__contained_mask | __class_type_info::__contained_virtual_mask)) == __class_type_info::__contained_mask); } static const __class_type_info *const nonvirtual_base_type = static_cast (0) + 1; } // namespace // __upcast_result is used to hold information during traversal of a class // hierarchy when catch matching. struct __class_type_info::__upcast_result { const void *dst_ptr; // pointer to caught object __sub_kind part2dst; // path from current base to target int src_details; // hints about the source type hierarchy const __class_type_info *base_type; // where we found the target, // if in vbase the __class_type_info of vbase // if a non-virtual base then 1 // else NULL __upcast_result (int d) :dst_ptr (NULL), part2dst (__unknown), src_details (d), base_type (NULL) {} }; // __dyncast_result is used to hold information during traversal of a class // hierarchy when dynamic casting. struct __class_type_info::__dyncast_result { const void *dst_ptr; // pointer to target object or NULL __sub_kind whole2dst; // path from most derived object to target __sub_kind whole2src; // path from most derived object to sub object __sub_kind dst2src; // path from target to sub object int whole_details; // details of the whole class hierarchy __dyncast_result (int details_ = __vmi_class_type_info::__flags_unknown_mask) :dst_ptr (NULL), whole2dst (__unknown), whole2src (__unknown), dst2src (__unknown), whole_details (details_) {} protected: __dyncast_result(const __dyncast_result&); __dyncast_result& operator=(const __dyncast_result&); }; inline __class_type_info::__sub_kind __class_type_info:: __find_public_src (ptrdiff_t src2dst, const void *obj_ptr, const __class_type_info *src_type, const void *src_ptr) const { if (src2dst >= 0) return adjust_pointer (obj_ptr, src2dst) == src_ptr ? __contained_public : __not_contained; if (src2dst == -2) return __not_contained; return __do_find_public_src (src2dst, obj_ptr, src_type, src_ptr); } }