// RTTI support for -*- C++ -*-
// Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
-// 2003, 2004, 2005, 2006, 2007
+// 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011
// 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 2, or (at your option)
+// 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,
// 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 GCC; see the file COPYING. If not, write to
-// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-// Boston, MA 02110-1301, 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.
+// 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 <exception>
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#include <bits/hash_bytes.h>
+#endif
+
#pragma GCC visibility push(default)
} // 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.
+// 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
- #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
+// By default, typeinfo names are not merged.
+#define __GXX_MERGED_TYPEINFO_NAMES 0
#endif
-// By default follow the same rules as for __GXX_MERGED_TYPEINFO_NAMES.
+// 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
class type_info
{
public:
- /** Destructor. Being the first non-inline virtual function, this
+ /** 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();
- 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; }
+ { return __name[0] == '*' ? __name + 1 : __name; }
#if !__GXX_TYPEINFO_EQUALITY_INLINE
- 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 before(const type_info& __arg) const;
bool operator==(const type_info& __arg) const;
#else
#if !__GXX_MERGED_TYPEINFO_NAMES
- #error "Inline implementation of type_info comparision requires merging of type_info objects"
- #endif
/** 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,
+ // 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
+ { return (__name[0] == '*' && __arg.__name[0] == '*')
+ ? __name < __arg.__name
+ : __builtin_strcmp (__name, __arg.__name) < 0; }
+
+ bool operator==(const type_info& __arg) const
+ {
+ 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
{ return __name < __arg.__name; }
+
bool operator==(const type_info& __arg) const
{ return __name == __arg.__name; }
+ #endif
#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
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ 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 // __GXX_EXPERIMENTAL_CXX0X__
+
+ // 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
+
+ // 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
virtual bool __do_catch(const type_info *__thr_type, void **__thr_obj,
unsigned __outer) const;
- // internally used during catch matching
+ // 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() throw() { }
+ 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() throw();
+ virtual ~bad_cast() _GLIBCXX_USE_NOEXCEPT;
+
// See comment in eh_exception.cc.
- virtual const char* what() const throw();
+ virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;
};
- /** If you use a NULL pointer in a @c typeid expression, this is thrown. */
+ /**
+ * @brief Thrown when a NULL pointer in a @c typeid expression is used.
+ * @ingroup exceptions
+ */
class bad_typeid : public exception
{
public:
- bad_typeid () throw() { }
+ 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() throw();
+ virtual ~bad_typeid() _GLIBCXX_USE_NOEXCEPT;
+
// See comment in eh_exception.cc.
- virtual const char* what() const throw();
+ virtual const char* what() const _GLIBCXX_USE_NOEXCEPT;
};
} // namespace std
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