1//===----------------------------------------------------------------------===//
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
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 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 // Data that modifies the search mechanism.
115
116 // There is no object (seen when we throw a null pointer to object).
117 bool have_object;
118 // Virtual base
119 const void* vbase_cookie;
120};
121
122// Has no base class
123class _LIBCXXABI_TYPE_VIS __class_type_info : public __shim_type_info {
124public:
125 _LIBCXXABI_HIDDEN virtual ~__class_type_info();
126
127 _LIBCXXABI_HIDDEN void process_static_type_above_dst(__dynamic_cast_info *,
128 const void *,
129 const void *, int) const;
130 _LIBCXXABI_HIDDEN void process_static_type_below_dst(__dynamic_cast_info *,
131 const void *, int) const;
132 _LIBCXXABI_HIDDEN void process_found_base_class(__dynamic_cast_info *, void *,
133 int) const;
134 _LIBCXXABI_HIDDEN virtual void search_above_dst(__dynamic_cast_info *,
135 const void *, const void *,
136 int, bool) const;
137 _LIBCXXABI_HIDDEN virtual void
138 search_below_dst(__dynamic_cast_info *, const void *, int, bool) const;
139 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
140 void *&) const;
141 _LIBCXXABI_HIDDEN virtual void
142 has_unambiguous_public_base(__dynamic_cast_info *, void *, int) const;
143};
144
145// Has one non-virtual public base class at offset zero
146class _LIBCXXABI_TYPE_VIS __si_class_type_info : public __class_type_info {
147public:
148 const __class_type_info *__base_type;
149
150 _LIBCXXABI_HIDDEN virtual ~__si_class_type_info();
151
152 _LIBCXXABI_HIDDEN virtual void search_above_dst(__dynamic_cast_info *,
153 const void *, const void *,
154 int, bool) const;
155 _LIBCXXABI_HIDDEN virtual void
156 search_below_dst(__dynamic_cast_info *, const void *, int, bool) const;
157 _LIBCXXABI_HIDDEN virtual void
158 has_unambiguous_public_base(__dynamic_cast_info *, void *, int) const;
159};
160
161struct _LIBCXXABI_HIDDEN __base_class_type_info
162{
163public:
164 const __class_type_info* __base_type;
165 long __offset_flags;
166
167 enum __offset_flags_masks
168 {
169 __virtual_mask = 0x1,
170 __public_mask = 0x2, // base is public
171 __offset_shift = 8
172 };
173
174 void search_above_dst(__dynamic_cast_info*, const void*, const void*, int, bool) const;
175 void search_below_dst(__dynamic_cast_info*, const void*, int, bool) const;
176 void has_unambiguous_public_base(__dynamic_cast_info*, void*, int) const;
177};
178
179// Has one or more base classes
180class _LIBCXXABI_TYPE_VIS __vmi_class_type_info : public __class_type_info {
181public:
182 unsigned int __flags;
183 unsigned int __base_count;
184 __base_class_type_info __base_info[1];
185
186 enum __flags_masks {
187 __non_diamond_repeat_mask = 0x1, // has two or more distinct base class
188 // objects of the same type
189 __diamond_shaped_mask = 0x2 // has base class object with two or
190 // more derived objects
191 };
192
193 _LIBCXXABI_HIDDEN virtual ~__vmi_class_type_info();
194
195 _LIBCXXABI_HIDDEN virtual void search_above_dst(__dynamic_cast_info *,
196 const void *, const void *,
197 int, bool) const;
198 _LIBCXXABI_HIDDEN virtual void
199 search_below_dst(__dynamic_cast_info *, const void *, int, bool) const;
200 _LIBCXXABI_HIDDEN virtual void
201 has_unambiguous_public_base(__dynamic_cast_info *, void *, int) const;
202};
203
204class _LIBCXXABI_TYPE_VIS __pbase_type_info : public __shim_type_info {
205public:
206 unsigned int __flags;
207 const __shim_type_info *__pointee;
208
209 enum __masks {
210 __const_mask = 0x1,
211 __volatile_mask = 0x2,
212 __restrict_mask = 0x4,
213 __incomplete_mask = 0x8,
214 __incomplete_class_mask = 0x10,
215 __transaction_safe_mask = 0x20,
216 // This implements the following proposal from cxx-abi-dev (not yet part of
217 // the ABI document):
218 //
219 // http://sourcerytools.com/pipermail/cxx-abi-dev/2016-October/002986.html
220 //
221 // This is necessary for support of http://wg21.link/p0012, which permits
222 // throwing noexcept function and member function pointers and catching
223 // them as non-noexcept pointers.
224 __noexcept_mask = 0x40,
225
226 // Flags that cannot be removed by a standard conversion.
227 __no_remove_flags_mask = __const_mask | __volatile_mask | __restrict_mask,
228 // Flags that cannot be added by a standard conversion.
229 __no_add_flags_mask = __transaction_safe_mask | __noexcept_mask
230 };
231
232 _LIBCXXABI_HIDDEN virtual ~__pbase_type_info();
233 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
234 void *&) const;
235};
236
237class _LIBCXXABI_TYPE_VIS __pointer_type_info : public __pbase_type_info {
238public:
239 _LIBCXXABI_HIDDEN virtual ~__pointer_type_info();
240 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
241 void *&) const;
242 _LIBCXXABI_HIDDEN bool can_catch_nested(const __shim_type_info *) const;
243};
244
245class _LIBCXXABI_TYPE_VIS __pointer_to_member_type_info
246 : public __pbase_type_info {
247public:
248 const __class_type_info *__context;
249
250 _LIBCXXABI_HIDDEN virtual ~__pointer_to_member_type_info();
251 _LIBCXXABI_HIDDEN virtual bool can_catch(const __shim_type_info *,
252 void *&) const;
253 _LIBCXXABI_HIDDEN bool can_catch_nested(const __shim_type_info *) const;
254};
255
256} // __cxxabiv1
257
258#endif // __PRIVATE_TYPEINFO_H_
259

source code of libcxxabi/src/private_typeinfo.h