0,0 → 1,156 |
// 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 |