// RTTI support for -*- C++ -*-
-// Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002
-// Free Software Foundation
+// Copyright (C) 1994-2014 Free Software Foundation, Inc.
//
-// This file is part of GNU CC.
+// This file is part of GCC.
//
-// GNU CC is free software; you can redistribute it and/or modify
+// 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.
-//
-// GNU CC is distributed in the hope that it will be useful,
+//
+// 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.
-//
-// 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.
+//
+// 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 header provides RTTI support.
+ * This is a Standard C++ Library header.
*/
-#ifndef __TYPEINFO__
-#define __TYPEINFO__
+#ifndef _TYPEINFO
+#define _TYPEINFO
+
+#pragma GCC system_header
#include <exception>
+#if __cplusplus >= 201103L
+#include <bits/hash_bytes.h>
+#endif
+
+#pragma GCC visibility push(default)
extern "C++" {
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
+// 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
+namespace std
{
- /** The @c type_info class describes type information generated by
+ /**
+ * @brief Part of RTTI.
+ *
+ * The @c type_info class describes type information generated by
* an implementation.
- * @brief Used in RTTI. */
- class type_info
+ */
+ 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; }
+ const char* name() const _GLIBCXX_NOEXCEPT
+ { return __name[0] == '*' ? __name + 1 : __name; }
-#if !__GXX_MERGED_TYPEINFO_NAMES
- bool before(const type_info& __arg) const;
+#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 operator==(const type_info& __arg) const;
+ 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. */
- // 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 _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
+ bool before(const type_info& __arg) const _GLIBCXX_NOEXCEPT
{ return __name < __arg.__name; }
- bool operator==(const type_info& __arg) const
+
+ bool operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT
{ return __name == __arg.__name; }
+ #endif
#endif
- bool operator!=(const type_info& __arg) const
+ bool operator!=(const type_info& __arg) const _GLIBCXX_NOEXCEPT
{ return !operator==(__arg); }
-
- // the internal interface
- public:
- // return true if this is a pointer type of some kind
+
+#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
+
+ // 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&);
};
- /** If you attempt an invalid @c dynamic_cast expression, an instance of
+ /**
+ * @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
+ 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 _GLIBCXX_USE_NOEXCEPT;
};
-
- /** If you use a NULL pointer in a @c typeid expression, this is thrown. */
- class bad_typeid : public exception
+
+ /**
+ * @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 _GLIBCXX_USE_NOEXCEPT;
};
} // namespace std
} // extern "C++"
+
+#pragma GCC visibility pop
+
#endif
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