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https://github.com/autc04/Retro68.git
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175 lines
5.7 KiB
C++
175 lines
5.7 KiB
C++
// RTTI support internals for -*- C++ -*-
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// Copyright (C) 1994-2019 Free Software Foundation, Inc.
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include "typeinfo"
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#include <cstddef>
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// Class declarations shared between the typeinfo implementation files.
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#include <cxxabi.h>
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namespace __cxxabiv1 {
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namespace {
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using namespace std;
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using namespace abi;
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// Initial part of a vtable, this structure is used with offsetof, so we don't
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// have to keep alignments consistent manually.
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struct vtable_prefix
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{
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// Offset to most derived object.
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ptrdiff_t whole_object;
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// Additional padding if necessary.
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#ifdef _GLIBCXX_VTABLE_PADDING
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ptrdiff_t padding1;
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#endif
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// Pointer to most derived type_info.
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const __class_type_info *whole_type;
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// Additional padding if necessary.
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#ifdef _GLIBCXX_VTABLE_PADDING
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ptrdiff_t padding2;
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#endif
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// What a class's vptr points to.
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const void *origin;
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};
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template <typename T>
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inline const T *
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adjust_pointer (const void *base, ptrdiff_t offset)
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{
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return reinterpret_cast <const T *>
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(reinterpret_cast <const char *> (base) + offset);
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}
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// ADDR is a pointer to an object. Convert it to a pointer to a base,
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// using OFFSET. IS_VIRTUAL is true, if we are getting a virtual base.
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inline void const *
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convert_to_base (void const *addr, bool is_virtual, ptrdiff_t offset)
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{
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if (is_virtual)
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{
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const void *vtable = *static_cast <const void *const *> (addr);
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offset = *adjust_pointer<ptrdiff_t> (vtable, offset);
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}
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return adjust_pointer<void> (addr, offset);
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}
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// some predicate functions for __class_type_info::__sub_kind
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inline bool contained_p (__class_type_info::__sub_kind access_path)
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{
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return access_path >= __class_type_info::__contained_mask;
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}
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inline bool public_p (__class_type_info::__sub_kind access_path)
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{
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return access_path & __class_type_info::__contained_public_mask;
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}
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inline bool virtual_p (__class_type_info::__sub_kind access_path)
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{
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return (access_path & __class_type_info::__contained_virtual_mask);
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}
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inline bool contained_public_p (__class_type_info::__sub_kind access_path)
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{
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return ((access_path & __class_type_info::__contained_public)
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== __class_type_info::__contained_public);
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}
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inline bool contained_nonpublic_p (__class_type_info::__sub_kind access_path)
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{
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return ((access_path & __class_type_info::__contained_public)
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== __class_type_info::__contained_mask);
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}
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inline bool contained_nonvirtual_p (__class_type_info::__sub_kind access_path)
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{
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return ((access_path & (__class_type_info::__contained_mask
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| __class_type_info::__contained_virtual_mask))
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== __class_type_info::__contained_mask);
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}
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static const __class_type_info *const nonvirtual_base_type =
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static_cast <const __class_type_info *> (0) + 1;
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} // namespace
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// __upcast_result is used to hold information during traversal of a class
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// hierarchy when catch matching.
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struct __class_type_info::__upcast_result
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{
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const void *dst_ptr; // pointer to caught object
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__sub_kind part2dst; // path from current base to target
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int src_details; // hints about the source type hierarchy
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const __class_type_info *base_type; // where we found the target,
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// if in vbase the __class_type_info of vbase
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// if a non-virtual base then 1
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// else NULL
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__upcast_result (int d)
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:dst_ptr (NULL), part2dst (__unknown), src_details (d), base_type (NULL)
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{}
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};
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// __dyncast_result is used to hold information during traversal of a class
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// hierarchy when dynamic casting.
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struct __class_type_info::__dyncast_result
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{
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const void *dst_ptr; // pointer to target object or NULL
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__sub_kind whole2dst; // path from most derived object to target
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__sub_kind whole2src; // path from most derived object to sub object
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__sub_kind dst2src; // path from target to sub object
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int whole_details; // details of the whole class hierarchy
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__dyncast_result (int details_ = __vmi_class_type_info::__flags_unknown_mask)
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:dst_ptr (NULL), whole2dst (__unknown),
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whole2src (__unknown), dst2src (__unknown),
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whole_details (details_)
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{}
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protected:
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__dyncast_result(const __dyncast_result&);
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__dyncast_result&
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operator=(const __dyncast_result&);
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};
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inline __class_type_info::__sub_kind __class_type_info::
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__find_public_src (ptrdiff_t src2dst,
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const void *obj_ptr,
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const __class_type_info *src_type,
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const void *src_ptr) const
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{
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if (src2dst >= 0)
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return adjust_pointer <void> (obj_ptr, src2dst) == src_ptr
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? __contained_public : __not_contained;
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if (src2dst == -2)
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return __not_contained;
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return __do_find_public_src (src2dst, obj_ptr, src_type, src_ptr);
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}
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}
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