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 <cstddef>
16
17namespace __cxxabiv1 {
18
19class _LIBCXXABI_TYPE_VIS __shim_type_info : public std::type_info {
20public:
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
29class _LIBCXXABI_TYPE_VIS __fundamental_type_info : public __shim_type_info {
30public:
31 _LIBCXXABI_HIDDEN virtual ~__fundamental_type_info();
32 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
33 void *&) const;
34};
35
36class _LIBCXXABI_TYPE_VIS __array_type_info : public __shim_type_info {
37public:
38 _LIBCXXABI_HIDDEN virtual ~__array_type_info();
39 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
40 void *&) const;
41};
42
43class _LIBCXXABI_TYPE_VIS __function_type_info : public __shim_type_info {
44public:
45 _LIBCXXABI_HIDDEN virtual ~__function_type_info();
46 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
47 void *&) const;
48};
49
50class _LIBCXXABI_TYPE_VIS __enum_type_info : public __shim_type_info {
51public:
52 _LIBCXXABI_HIDDEN virtual ~__enum_type_info();
53 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
54 void *&) const;
55};
56
57enum
58{
59 unknown = 0,
60 public_path,
61 not_public_path,
62 yes,
63 no
64};
65
66class _LIBCXXABI_TYPE_VIS __class_type_info;
67
68struct _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 std::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
116class _LIBCXXABI_TYPE_VIS __class_type_info : public __shim_type_info {
117public:
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
139class _LIBCXXABI_TYPE_VIS __si_class_type_info : public __class_type_info {
140public:
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
154struct _LIBCXXABI_HIDDEN __base_class_type_info
155{
156public:
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
173class _LIBCXXABI_TYPE_VIS __vmi_class_type_info : public __class_type_info {
174public:
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
197class _LIBCXXABI_TYPE_VIS __pbase_type_info : public __shim_type_info {
198public:
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
230class _LIBCXXABI_TYPE_VIS __pointer_type_info : public __pbase_type_info {
231public:
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
238class _LIBCXXABI_TYPE_VIS __pointer_to_member_type_info
239 : public __pbase_type_info {
240public:
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_
252