1 // RTTI support for -*- C++ -*-
2 // Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002
3 // Free Software Foundation
5 // This file is part of GCC.
7 // GCC is free software; you can redistribute it and/or modify
8 // it under the terms of the GNU General Public License as published by
9 // the Free Software Foundation; either version 2, or (at your option)
12 // GCC is distributed in the hope that it will be useful,
13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 // GNU General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with GCC; see the file COPYING. If not, write to
19 // the Free Software Foundation, 59 Temple Place - Suite 330,
20 // Boston, MA 02111-1307, USA.
22 // As a special exception, you may use this file as part of a free software
23 // library without restriction. Specifically, if other files instantiate
24 // templates or use macros or inline functions from this file, or you compile
25 // this file and link it with other files to produce an executable, this
26 // file does not by itself cause the resulting executable to be covered by
27 // the GNU General Public License. This exception does not however
28 // invalidate any other reasons why the executable file might be covered by
29 // the GNU General Public License.
32 * This header provides RTTI support.
40 #pragma GCC visibility push(default)
46 class __class_type_info;
47 } // namespace __cxxabiv1
49 #ifndef __GXX_MERGED_TYPEINFO_NAMES
51 // If weak symbols are not supported, typeinfo names are not merged.
52 #define __GXX_MERGED_TYPEINFO_NAMES 0
54 // On platforms that support weak symbols, typeinfo names are merged.
55 #define __GXX_MERGED_TYPEINFO_NAMES 1
62 * @brief Part of RTTI.
64 * The @c type_info class describes type information generated by
70 /** Destructor. Being the first non-inline virtual function, this
71 * controls in which translation unit the vtable is emitted. The
72 * compiler makes use of that information to know where to emit
73 * the runtime-mandated type_info structures in the new-abi. */
77 /// Assigning type_info is not supported. Made private.
78 type_info& operator=(const type_info&);
79 type_info(const type_info&);
85 explicit type_info(const char *__n): __name(__n) { }
88 // the public interface
89 /** Returns an @e implementation-defined byte string; this is not
90 * portable between compilers! */
91 const char* name() const
94 #if !__GXX_MERGED_TYPEINFO_NAMES
95 bool before(const type_info& __arg) const;
96 // In old abi, or when weak symbols are not supported, there can
97 // be multiple instances of a type_info object for one
98 // type. Uniqueness must use the _name value, not object address.
99 bool operator==(const type_info& __arg) const;
101 /** Returns true if @c *this precedes @c __arg in the implementation's
102 * collation order. */
103 // In new abi we can rely on type_info's NTBS being unique,
104 // and therefore address comparisons are sufficient.
105 bool before(const type_info& __arg) const
106 { return __name < __arg.__name; }
107 bool operator==(const type_info& __arg) const
108 { return __name == __arg.__name; }
110 bool operator!=(const type_info& __arg) const
111 { return !operator==(__arg); }
113 // the internal interface
115 // return true if this is a pointer type of some kind
116 virtual bool __is_pointer_p() const;
117 // return true if this is a function type
118 virtual bool __is_function_p() const;
120 // Try and catch a thrown type. Store an adjusted pointer to the
121 // caught type in THR_OBJ. If THR_TYPE is not a pointer type, then
122 // THR_OBJ points to the thrown object. If THR_TYPE is a pointer
123 // type, then THR_OBJ is the pointer itself. OUTER indicates the
124 // number of outer pointers, and whether they were const
126 virtual bool __do_catch(const type_info *__thr_type, void **__thr_obj,
127 unsigned __outer) const;
129 // internally used during catch matching
130 virtual bool __do_upcast(const __cxxabiv1::__class_type_info *__target,
131 void **__obj_ptr) const;
135 * @brief Thrown during incorrect typecasting.
137 * If you attempt an invalid @c dynamic_cast expression, an instance of
138 * this class (or something derived from this class) is thrown. */
139 class bad_cast : public exception
142 bad_cast() throw() { }
143 // This declaration is not useless:
144 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
145 virtual ~bad_cast() throw();
148 /** If you use a NULL pointer in a @c typeid expression, this is thrown. */
149 class bad_typeid : public exception
152 bad_typeid () throw() { }
153 // This declaration is not useless:
154 // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
155 virtual ~bad_typeid() throw();
159 #pragma GCC visibility pop