blob: eea38e70e4a153e17b4cdd226451886c98e5017a [file] [log] [blame]
// RTTI support for -*- C++ -*-
// Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
// 2003, 2004, 2005, 2006, 2007, 2009
// Free Software Foundation
// This file is part of GCC.
// GCC 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 3, or (at your option)
// any later version.
// GCC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <>.
/** @file typeinfo
* This is a Standard C++ Library header.
#ifndef _TYPEINFO
#define _TYPEINFO
#include <exception>
#pragma GCC visibility push(default)
extern "C++" {
namespace __cxxabiv1
class __class_type_info;
} // namespace __cxxabiv1
// Determine whether typeinfo names for the same type are merged (in which
// case comparison can just compare pointers) or not (in which case
// strings must be compared and g++.dg/abi/local1.C will fail), and
// whether comparison is to be implemented inline or not. By default we
// use inline pointer comparison if weak symbols are available, and
// out-of-line strcmp if not. Out-of-line pointer comparison is used
// where the object files are to be portable to multiple systems, some of
// which may not be able to use pointer comparison, but the particular
// system for which libstdc++ is being built can use pointer comparison;
// in particular for most ARM EABI systems, where the ABI specifies
// out-of-line comparison. Inline strcmp is not currently supported. The
// compiler's target configuration can override the defaults by defining
// __GXX_TYPEINFO_EQUALITY_INLINE to 1 or 0 to indicate whether or not
// comparison is inline, and __GXX_MERGED_TYPEINFO_NAMES to 1 or 0 to
// indicate whether or not pointer comparison can be used.
#if !__GXX_WEAK__
// If weak symbols are not supported, typeinfo names are not merged.
// On platforms that support weak symbols, typeinfo names are merged.
// By default follow the same rules as for __GXX_MERGED_TYPEINFO_NAMES.
#if !__GXX_WEAK__
namespace std
* @brief Part of RTTI.
* The @c type_info class describes type information generated by
* an implementation.
class type_info
/** Destructor first. 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();
/** Returns an @e implementation-defined byte string; this is not
* portable between compilers! */
const char* name() const
{ return __name; }
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;
#error "Inline implementation of type_info comparision requires merging of type_info objects"
/** 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; }
bool operator!=(const type_info& __arg) const
{ return !operator==(__arg); }
// 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;
const char *__name;
explicit type_info(const char *__n): __name(__n) { }
/// Assigning type_info is not supported.
type_info& operator=(const type_info&);
type_info(const type_info&);
* @brief Thrown during incorrect typecasting.
* @ingroup exceptions
* 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
bad_cast() throw() { }
// This declaration is not useless:
virtual ~bad_cast() throw();
// See comment in
virtual const char* what() const throw();
* @brief Thrown when a NULL pointer in a @c typeid expression is used.
* @ingroup exceptions
class bad_typeid : public exception
bad_typeid () throw() { }
// This declaration is not useless:
virtual ~bad_typeid() throw();
// See comment in
virtual const char* what() const throw();
} // namespace std
#pragma GCC visibility pop
} // extern "C++"