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// RTTI support for -*- C++ -*-
// Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002
// Free Software Foundation
//
// This file is part of GNU CC.
//
// GNU CC 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 2, or (at your option)
// any later version.
//
// GNU CC 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.
//
// You should have received a copy of the GNU General Public License
// along with GNU CC; see the file COPYING. If not, write to
// the Free Software Foundation, 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file typeinfo
* This header provides RTTI support.
*/
#ifndef __TYPEINFO__
#define __TYPEINFO__
#include <exception>
extern "C++" {
namespace __cxxabiv1
{
class __class_type_info;
} // namespace __cxxabiv1
#if !__GXX_WEAK__
// If weak symbols are not supported, typeinfo names are not merged.
#define __GXX_MERGED_TYPEINFO_NAMES 0
#else
// On platforms that support weak symbols, typeinfo names are merged.
#define __GXX_MERGED_TYPEINFO_NAMES 1
#endif
namespace std
{
/**
* @brief Part of RTTI.
*
* The @c type_info class describes type information generated by
* an implementation.
*/
class type_info
{
public:
/** Destructor. Being the first non-inline virtual function, this
* controls in which translation unit the vtable is emitted. The
* compiler makes use of that information to know where to emit
* the runtime-mandated type_info structures in the new-abi. */
virtual ~type_info();
private:
/// Assigning type_info is not supported. Made private.
type_info& operator=(const type_info&);
type_info(const type_info&);
protected:
const char *__name;
protected:
explicit type_info(const char *__n): __name(__n) { }
public:
// the public interface
/** Returns an @e implementation-defined byte string; this is not
* portable between compilers! */
const char* name() const
{ return __name; }
#if !__GXX_MERGED_TYPEINFO_NAMES
bool before(const type_info& __arg) const;
// In old abi, or when weak symbols are not supported, there can
// be multiple instances of a type_info object for one
// type. Uniqueness must use the _name value, not object address.
bool operator==(const type_info& __arg) const;
#else
/** Returns true if @c *this precedes @c __arg in the implementation's
* collation order. */
// In new abi we can rely on type_info's NTBS being unique,
// and therefore address comparisons are sufficient.
bool before(const type_info& __arg) const
{ return __name < __arg.__name; }
bool operator==(const type_info& __arg) const
{ return __name == __arg.__name; }
#endif
bool operator!=(const type_info& __arg) const
{ return !operator==(__arg); }
// the internal interface
public:
// return true if this is a pointer type of some kind
virtual bool __is_pointer_p() const;
// return true if this is a function type
virtual bool __is_function_p() const;
// Try and catch a thrown type. Store an adjusted pointer to the
// caught type in THR_OBJ. If THR_TYPE is not a pointer type, then
// THR_OBJ points to the thrown object. If THR_TYPE is a pointer
// type, then THR_OBJ is the pointer itself. OUTER indicates the
// number of outer pointers, and whether they were const
// qualified.
virtual bool __do_catch(const type_info *__thr_type, void **__thr_obj,
unsigned __outer) const;
// internally used during catch matching
virtual bool __do_upcast(const __cxxabiv1::__class_type_info *__target,
void **__obj_ptr) const;
};
/**
* @brief Thrown during incorrect typecasting.
*
* If you attempt an invalid @c dynamic_cast expression, an instance of
* this class (or something derived from this class) is thrown. */
class bad_cast : public exception
{
public:
bad_cast() throw() { }
// This declaration is not useless:
// http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
virtual ~bad_cast() throw();
};
/** If you use a NULL pointer in a @c typeid expression, this is thrown. */
class bad_typeid : public exception
{
public:
bad_typeid () throw() { }
// This declaration is not useless:
// http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
virtual ~bad_typeid() throw();
};
} // namespace std
} // extern "C++"
#endif
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