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Edit File : typeinfo \| Size : 7.51 KB
// RTTI support for -- C++ -- // Copyright (C) 1994-2018 Free Software Foundation, Inc. // // 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 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // 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 // <http://www.gnu.org/licenses/>. /** @file typeinfo * This is a Standard C++ Library header. / #ifndef _TYPEINFO #define _TYPEINFO #pragma GCC system_header #include <bits/exception.h> #if __cplusplus >= 201103L #include <bits/hash_bytes.h> #endif #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 whether comparison is to be implemented inline or // not. We used to do inline pointer comparison by default if weak symbols // are available, but even with weak symbols sometimes names are not merged // when objects are loaded with RTLD_LOCAL, so now we always use strcmp by // default. For ABI compatibility, we do the strcmp inline if weak symbols // are available, and out-of-line 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. 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. #ifndef __GXX_MERGED_TYPEINFO_NAMES // By default, typeinfo names are not merged. #define __GXX_MERGED_TYPEINFO_NAMES 0 #endif // By default follow the old inline rules to avoid ABI changes. #ifndef __GXX_TYPEINFO_EQUALITY_INLINE #if !__GXX_WEAK__ #define __GXX_TYPEINFO_EQUALITY_INLINE 0 #else #define __GXX_TYPEINFO_EQUALITY_INLINE 1 #endif #endif namespace std { /* * @brief Part of RTTI. * * The @c type_info class describes type information generated by * an implementation. / class type_info { public: /* 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 _GLIBCXX_NOEXCEPT { return __name[0] == '' ? __name + 1 : __name; } #if !__GXX_TYPEINFO_EQUALITY_INLINE // 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 before(const type_info& __arg) const _GLIBCXX_NOEXCEPT; bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT; #else #if !__GXX_MERGED_TYPEINFO_NAMES /* Returns true if @c this precedes @c __arg in the implementation's collation order. / // Even with the new abi, on systems that support dlopen // we can run into cases where type_info names aren't merged, // so we still need to do string comparison. bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT { return (__name[0] == '' && __arg.__name[0] == '') ? __name < __arg.__name : __builtin_strcmp (__name, __arg.__name) < 0; } bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT { return ((__name == __arg.__name) \|\| (__name[0] != '' && __builtin_strcmp (__name, __arg.__name) == 0)); } #else // On some targets we can rely on type_info's NTBS being unique, // and therefore address comparisons are sufficient. bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT { return __name < __arg.__name; } bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT { return __name == __arg.__name; } #endif #endif bool operator!=(const type_info& __arg) const _GLIBCXX_NOEXCEPT { return !operator==(__arg); } #if __cplusplus >= 201103L size_t hash_code() const noexcept { # if !__GXX_MERGED_TYPEINFO_NAMES return _Hash_bytes(name(), __builtin_strlen(name()), static_cast<size_t>(0xc70f6907UL)); # else return reinterpret_cast<size_t>(__name); # endif } #endif // C++11 // 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; protected: const char __name; explicit type_info(const char __n): __name(__n) { } private: /// 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 { public: bad_cast() _GLIBCXX_USE_NOEXCEPT { } // This declaration is not useless: // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 virtual ~bad_cast() _GLIBCXX_USE_NOEXCEPT; // See comment in eh_exception.cc. virtual const char what() const _GLIBCXX_USE_NOEXCEPT; }; /** * @brief Thrown when a NULL pointer in a @c typeid expression is used. * @ingroup exceptions / class bad_typeid : public exception { public: bad_typeid () _GLIBCXX_USE_NOEXCEPT { } // This declaration is not useless: // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118 virtual ~bad_typeid() _GLIBCXX_USE_NOEXCEPT; // See comment in eh_exception.cc. virtual const char what() const _GLIBCXX_USE_NOEXCEPT; }; } // namespace std } // extern "C++" #pragma GCC visibility pop #endif Back

Edit File : typeinfo | Size : 7.51 KB

// RTTI support for -*- C++ -*-
// Copyright (C) 1994-2018 Free Software Foundation, Inc.
//
// 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
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// 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
// <http://www.gnu.org/licenses/>.

/** @file typeinfo
 *  This is a Standard C++ Library header.
 */

#ifndef _TYPEINFO
#define _TYPEINFO

#pragma GCC system_header

#include <bits/exception.h>
#if __cplusplus >= 201103L
#include <bits/hash_bytes.h>
#endif

#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 whether comparison is to be implemented inline or
// not.  We used to do inline pointer comparison by default if weak symbols
// are available, but even with weak symbols sometimes names are not merged
// when objects are loaded with RTLD_LOCAL, so now we always use strcmp by
// default.  For ABI compatibility, we do the strcmp inline if weak symbols
// are available, and out-of-line 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.  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.

#ifndef __GXX_MERGED_TYPEINFO_NAMES
// By default, typeinfo names are not merged.
#define __GXX_MERGED_TYPEINFO_NAMES 0
#endif

// By default follow the old inline rules to avoid ABI changes.
#ifndef __GXX_TYPEINFO_EQUALITY_INLINE
  #if !__GXX_WEAK__
    #define __GXX_TYPEINFO_EQUALITY_INLINE 0
  #else
    #define __GXX_TYPEINFO_EQUALITY_INLINE 1
  #endif
#endif

namespace std
{
  /**
   *  @brief  Part of RTTI.
   *
   *  The @c type_info class describes type information generated by
   *  an implementation.
  */
  class type_info
  {
  public:
    /** 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 _GLIBCXX_NOEXCEPT
    { return __name[0] == '*' ? __name + 1 : __name; }

#if !__GXX_TYPEINFO_EQUALITY_INLINE
    // 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 before(const type_info& __arg) const _GLIBCXX_NOEXCEPT;
    bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT;
#else
  #if !__GXX_MERGED_TYPEINFO_NAMES
    /** Returns true if @c *this precedes @c __arg in the implementation's
     *  collation order.  */
    // Even with the new abi, on systems that support dlopen
    // we can run into cases where type_info names aren't merged,
    // so we still need to do string comparison.
    bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT
    { return (__name[0] == '*' && __arg.__name[0] == '*')
	? __name < __arg.__name
	: __builtin_strcmp (__name, __arg.__name) < 0; }

bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT
    {
      return ((__name == __arg.__name)
	      || (__name[0] != '*' &&
		  __builtin_strcmp (__name, __arg.__name) == 0));
    }
  #else
    // On some targets we can rely on type_info's NTBS being unique,
    // and therefore address comparisons are sufficient.
    bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT
    { return __name < __arg.__name; }

bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT
    { return __name == __arg.__name; }
  #endif
#endif
    bool operator!=(const type_info& __arg) const _GLIBCXX_NOEXCEPT
    { return !operator==(__arg); }

#if __cplusplus >= 201103L
    size_t hash_code() const noexcept
    {
#  if !__GXX_MERGED_TYPEINFO_NAMES
      return _Hash_bytes(name(), __builtin_strlen(name()),
			 static_cast<size_t>(0xc70f6907UL));
#  else
      return reinterpret_cast<size_t>(__name);
#  endif
    }
#endif // C++11

// 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;

protected:
    const char *__name;

explicit type_info(const char *__n): __name(__n) { }

private:
    /// 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
  {
  public:
    bad_cast() _GLIBCXX_USE_NOEXCEPT { }

// This declaration is not useless:
    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
    virtual ~bad_cast() _GLIBCXX_USE_NOEXCEPT;

// See comment in eh_exception.cc.
    virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;
  };

/**
   *  @brief Thrown when a NULL pointer in a @c typeid expression is used.
   *  @ingroup exceptions
   */
  class bad_typeid : public exception
  {
  public:
    bad_typeid () _GLIBCXX_USE_NOEXCEPT { }

// This declaration is not useless:
    // http://gcc.gnu.org/onlinedocs/gcc-3.0.2/gcc_6.html#SEC118
    virtual ~bad_typeid() _GLIBCXX_USE_NOEXCEPT;

// See comment in eh_exception.cc.
    virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;
  };
} // namespace std

} // extern "C++"

#pragma GCC visibility pop

#endif

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