LTP GCOV extension - code coverage report
Current view: | directory - usr/include/c++/4.3 - typeinfo
Test: | lcov.info
Date: | 2008-08-14 |  | Instrumented lines: | 4
Code covered: | 50.0 % |  | Executed lines: | 2

           1                 : // RTTI support for -*- C++ -*-
           2                 : // Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
           3                 : // 2003, 2004, 2005, 2006, 2007
           4                 : // Free Software Foundation
           5                 : //
           6                 : // This file is part of GCC.
           7                 : //
           8                 : // GCC is free software; you can redistribute it and/or modify
           9                 : // it under the terms of the GNU General Public License as published by
          10                 : // the Free Software Foundation; either version 2, or (at your option)
          11                 : // any later version.
          12                 : //
          13                 : // GCC is distributed in the hope that it will be useful,
          14                 : // but WITHOUT ANY WARRANTY; without even the implied warranty of
          15                 : // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
          16                 : // GNU General Public License for more details.
          17                 : //
          18                 : // You should have received a copy of the GNU General Public License
          19                 : // along with GCC; see the file COPYING.  If not, write to
          20                 : // the Free Software Foundation, 51 Franklin Street, Fifth Floor,
          21                 : // Boston, MA 02110-1301, USA.
          22                 :
          23                 : // As a special exception, you may use this file as part of a free software
          24                 : // library without restriction.  Specifically, if other files instantiate
          25                 : // templates or use macros or inline functions from this file, or you compile
          26                 : // this file and link it with other files to produce an executable, this
          27                 : // file does not by itself cause the resulting executable to be covered by
          28                 : // the GNU General Public License.  This exception does not however
          29                 : // invalidate any other reasons why the executable file might be covered by
          30                 : // the GNU General Public License.
          31                 :
          32                 : /** @file typeinfo
          33                 :  *  This is a Standard C++ Library header.
          34                 :  */
          35                 :
          36                 : #ifndef _TYPEINFO
          37                 : #define _TYPEINFO
          38                 :
          39                 : #include <exception>
          40                 :
          41                 : #pragma GCC visibility push(default)
          42                 :
          43                 : extern "C++" {
          44                 :
          45                 : namespace __cxxabiv1
          46                 : {
          47                 :   class __class_type_info;
          48                 : } // namespace __cxxabiv1
          49                 :
          50                 : // Determine whether typeinfo names for the same type are merged (in which
          51                 : // case comparison can just compare pointers) or not (in which case
          52                 : // strings must be compared and g++.dg/abi/local1.C will fail), and
          53                 : // whether comparison is to be implemented inline or not.  By default we
          54                 : // use inline pointer comparison if weak symbols are available, and
          55                 : // out-of-line strcmp if not.  Out-of-line pointer comparison is used
          56                 : // where the object files are to be portable to multiple systems, some of
          57                 : // which may not be able to use pointer comparison, but the particular
          58                 : // system for which libstdc++ is being built can use pointer comparison;
          59                 : // in particular for most ARM EABI systems, where the ABI specifies
          60                 : // out-of-line comparison.  Inline strcmp is not currently supported.  The
          61                 : // compiler's target configuration can override the defaults by defining
          62                 : // __GXX_TYPEINFO_EQUALITY_INLINE to 1 or 0 to indicate whether or not
          63                 : // comparison is inline, and __GXX_MERGED_TYPEINFO_NAMES to 1 or 0 to
          64                 : // indicate whether or not pointer comparison can be used.
          65                 :
          66                 : #ifndef __GXX_MERGED_TYPEINFO_NAMES
          67                 :   #if !__GXX_WEAK__
          68                 :     // If weak symbols are not supported, typeinfo names are not merged.
          69                 :     #define __GXX_MERGED_TYPEINFO_NAMES 0
          70                 :   #else
          71                 :     // On platforms that support weak symbols, typeinfo names are merged.
          72                 :     #define __GXX_MERGED_TYPEINFO_NAMES 1
          73                 :   #endif
          74                 : #endif
          75                 :
          76                 : // By default follow the same rules as for __GXX_MERGED_TYPEINFO_NAMES.
          77                 : #ifndef __GXX_TYPEINFO_EQUALITY_INLINE
          78                 :   #if !__GXX_WEAK__
          79                 :     #define __GXX_TYPEINFO_EQUALITY_INLINE 0
          80                 :   #else
          81                 :     #define __GXX_TYPEINFO_EQUALITY_INLINE 1
          82                 :   #endif
          83                 : #endif
          84                 :
          85                 : namespace std
          86                 : {
          87                 :   /**
          88                 :    *  @brief  Part of RTTI.
          89                 :    *
          90                 :    *  The @c type_info class describes type information generated by
          91                 :    *  an implementation.
          92                 :   */
          93                 :   class type_info
          94                 :   {
          95                 :   public:
          96                 :     /** Destructor first. Being the first non-inline virtual function, this
          97                 :      *  controls in which translation unit the vtable is emitted. The
          98                 :      *  compiler makes use of that information to know where to emit
          99                 :      *  the runtime-mandated type_info structures in the new-abi.  */
         100                 :     virtual ~type_info();
         101                 :
         102                 :     /** Returns an @e implementation-defined byte string; this is not
         103                 :      *  portable between compilers!  */
         104               2 :     const char* name() const
         105               2 :     { return __name; }
         106                 :
         107                 : #if !__GXX_TYPEINFO_EQUALITY_INLINE
         108                 :     bool before(const type_info& __arg) const;
         109                 :
         110                 :     // In old abi, or when weak symbols are not supported, there can
         111                 :     // be multiple instances of a type_info object for one
         112                 :     // type. Uniqueness must use the _name value, not object address.
         113                 :     bool operator==(const type_info& __arg) const;
         114                 : #else
         115                 :   #if !__GXX_MERGED_TYPEINFO_NAMES
         116                 :     #error "Inline implementation of type_info comparision requires merging of type_info objects"
         117                 :   #endif
         118                 :     /** Returns true if @c *this precedes @c __arg in the implementation's
         119                 :      *  collation order.  */
         120                 :     // In new abi we can rely on type_info's NTBS being unique,
         121                 :     // and therefore address comparisons are sufficient.
         122               0 :     bool before(const type_info& __arg) const
         123               0 :     { return __name < __arg.__name; }
         124                 :
         125                 :     bool operator==(const type_info& __arg) const
         126                 :     { return __name == __arg.__name; }
         127                 : #endif
         128                 :     bool operator!=(const type_info& __arg) const
         129                 :     { return !operator==(__arg); }
         130                 :
         131                 :     // Return true if this is a pointer type of some kind
         132                 :     virtual bool __is_pointer_p() const;
         133                 :
         134                 :     // Return true if this is a function type
         135                 :     virtual bool __is_function_p() const;
         136                 :
         137                 :     // Try and catch a thrown type. Store an adjusted pointer to the
         138                 :     // caught type in THR_OBJ. If THR_TYPE is not a pointer type, then
         139                 :     // THR_OBJ points to the thrown object. If THR_TYPE is a pointer
         140                 :     // type, then THR_OBJ is the pointer itself. OUTER indicates the
         141                 :     // number of outer pointers, and whether they were const
         142                 :     // qualified.
         143                 :     virtual bool __do_catch(const type_info *__thr_type, void **__thr_obj,
         144                 :                             unsigned __outer) const;
         145                 :
         146                 :     // Internally used during catch matching
         147                 :     virtual bool __do_upcast(const __cxxabiv1::__class_type_info *__target,
         148                 :                              void **__obj_ptr) const;
         149                 :
         150                 :   protected:
         151                 :     const char *__name;
         152                 :
         153                 :     explicit type_info(const char *__n): __name(__n) { }
         154                 :
         155                 :   private:
         156                 :     /// Assigning type_info is not supported.
         157                 :     type_info& operator=(const type_info&);
         158                 :     type_info(const type_info&);
         159                 :   };
         160                 :
         161                 :   /**
         162                 :    *  @brief  Thrown during incorrect typecasting.
         163                 :    *
         164                 :    *  If you attempt an invalid @c dynamic_cast expression, an instance of
         165                 :    *  this class (or something derived from this class) is thrown.  */
         166                 :   class bad_cast : public exception
         167                 :   {
         168                 :   public:
         169                 :     bad_cast() throw() { }
         170                 :
         171                 :     // This declaration is not useless:
         172                 :     // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
         173                 :     virtual ~bad_cast() throw();
         174                 :
         175                 :     // See comment in eh_exception.cc.
         176                 :     virtual const char* what() const throw();
         177                 :   };
         178                 :
         179                 :   /** If you use a NULL pointer in a @c typeid expression, this is thrown.  */
         180                 :   class bad_typeid : public exception
         181                 :   {
         182                 :   public:
         183                 :     bad_typeid () throw() { }
         184                 :
         185                 :     // This declaration is not useless:
         186                 :     // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
         187                 :     virtual ~bad_typeid() throw();
         188                 :
         189                 :     // See comment in eh_exception.cc.
         190                 :     virtual const char* what() const throw();
         191                 :   };
         192                 : } // namespace std
         193                 :
         194                 : #pragma GCC visibility pop
         195                 :
         196                 : } // extern "C++"
         197                 : #endif

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