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Edit File : exception_ptr.h \| Size : 5.84 KB
// Exception Handling support header (exception_ptr class) for -- C++ -- // Copyright (C) 2008-2018 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 bits/exception_ptr.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{exception} / #ifndef _EXCEPTION_PTR_H #define _EXCEPTION_PTR_H #pragma GCC visibility push(default) #include <bits/c++config.h> #include <bits/exception_defines.h> #include <bits/cxxabi_init_exception.h> #include <typeinfo> #include <new> extern "C++" { namespace std { class type_info; /* * @addtogroup exceptions * @{ / namespace __exception_ptr { class exception_ptr; } using __exception_ptr::exception_ptr; /* Obtain an exception_ptr to the currently handled exception. If there * is none, or the currently handled exception is foreign, return the null * value. / exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT; template<typename _Ex> exception_ptr make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT; /// Throw the object pointed to by the exception_ptr. void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__)); namespace __exception_ptr { using std::rethrow_exception; /* * @brief An opaque pointer to an arbitrary exception. * @ingroup exceptions / class exception_ptr { void _M_exception_object; explicit exception_ptr(void* __e) _GLIBCXX_USE_NOEXCEPT; void _M_addref() _GLIBCXX_USE_NOEXCEPT; void _M_release() _GLIBCXX_USE_NOEXCEPT; void _M_get() const _GLIBCXX_NOEXCEPT __attribute__ ((__pure__)); friend exception_ptr std::current_exception() _GLIBCXX_USE_NOEXCEPT; friend void std::rethrow_exception(exception_ptr); template<typename _Ex> friend exception_ptr std::make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT; public: exception_ptr() _GLIBCXX_USE_NOEXCEPT; exception_ptr(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT; #if __cplusplus >= 201103L exception_ptr(nullptr_t) noexcept : _M_exception_object(0) { } exception_ptr(exception_ptr&& __o) noexcept : _M_exception_object(__o._M_exception_object) { __o._M_exception_object = 0; } #endif #if (__cplusplus < 201103L) \|\| defined (_GLIBCXX_EH_PTR_COMPAT) typedef void (exception_ptr::__safe_bool)(); // For construction from nullptr or 0. exception_ptr(__safe_bool) _GLIBCXX_USE_NOEXCEPT; #endif exception_ptr& operator=(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT; #if __cplusplus >= 201103L exception_ptr& operator=(exception_ptr&& __o) noexcept { exception_ptr(static_cast<exception_ptr&&>(__o)).swap(this); return this; } #endif ~exception_ptr() _GLIBCXX_USE_NOEXCEPT; void swap(exception_ptr&) _GLIBCXX_USE_NOEXCEPT; #ifdef _GLIBCXX_EH_PTR_COMPAT // Retained for compatibility with CXXABI_1.3. void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__const__)); bool operator!() const _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); operator __safe_bool() const _GLIBCXX_USE_NOEXCEPT; #endif #if __cplusplus >= 201103L explicit operator bool() const { return _M_exception_object; } #endif friend bool operator==(const exception_ptr&, const exception_ptr&) _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); const class std::type_info* __cxa_exception_type() const _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); }; bool operator==(const exception_ptr&, const exception_ptr&) _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); bool operator!=(const exception_ptr&, const exception_ptr&) _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__)); inline void swap(exception_ptr& __lhs, exception_ptr& __rhs) { __lhs.swap(__rhs); } template<typename _Ex> inline void __dest_thunk(void* __x) { static_cast<_Ex>(__x)->~_Ex(); } } // namespace __exception_ptr /// Obtain an exception_ptr pointing to a copy of the supplied object. template<typename _Ex> exception_ptr make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT { #if __cpp_exceptions && __cpp_rtti && !_GLIBCXX_HAVE_CDTOR_CALLABI void __e = __cxxabiv1::__cxa_allocate_exception(sizeof(_Ex)); (void) __cxxabiv1::__cxa_init_primary_exception( __e, const_cast<std::type_info*>(&typeid(__ex)), __exception_ptr::__dest_thunk<_Ex>); try { ::new (__e) _Ex(__ex); return exception_ptr(__e); } catch(...) { __cxxabiv1::__cxa_free_exception(__e); return current_exception(); } #elif __cpp_exceptions try { throw __ex; } catch(...) { return current_exception(); } #else // no RTTI and no exceptions return exception_ptr(); #endif } // @} group exceptions } // namespace std } // extern "C++" #pragma GCC visibility pop #endif Back

Edit File : exception_ptr.h | Size : 5.84 KB

// Exception Handling support header (exception_ptr class) for -*- C++ -*-

// Copyright (C) 2008-2018 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 bits/exception_ptr.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{exception}
 */

#ifndef _EXCEPTION_PTR_H
#define _EXCEPTION_PTR_H

#pragma GCC visibility push(default)

#include <bits/c++config.h>
#include <bits/exception_defines.h>
#include <bits/cxxabi_init_exception.h>
#include <typeinfo>
#include <new>

extern "C++" {

namespace std 
{
  class type_info;

/**
   * @addtogroup exceptions
   * @{
   */
  namespace __exception_ptr
  {
    class exception_ptr;
  }

using __exception_ptr::exception_ptr;

/** Obtain an exception_ptr to the currently handled exception. If there
   *  is none, or the currently handled exception is foreign, return the null
   *  value.
   */
  exception_ptr current_exception() _GLIBCXX_USE_NOEXCEPT;

template<typename _Ex>
  exception_ptr make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT;

/// Throw the object pointed to by the exception_ptr.
  void rethrow_exception(exception_ptr) __attribute__ ((__noreturn__));

namespace __exception_ptr
  {
    using std::rethrow_exception;

/**
     *  @brief An opaque pointer to an arbitrary exception.
     *  @ingroup exceptions
     */
    class exception_ptr
    {
      void* _M_exception_object;

explicit exception_ptr(void* __e) _GLIBCXX_USE_NOEXCEPT;

void _M_addref() _GLIBCXX_USE_NOEXCEPT;
      void _M_release() _GLIBCXX_USE_NOEXCEPT;

void *_M_get() const _GLIBCXX_NOEXCEPT __attribute__ ((__pure__));

friend exception_ptr std::current_exception() _GLIBCXX_USE_NOEXCEPT;
      friend void std::rethrow_exception(exception_ptr);
      template<typename _Ex>
      friend exception_ptr std::make_exception_ptr(_Ex) _GLIBCXX_USE_NOEXCEPT;

public:
      exception_ptr() _GLIBCXX_USE_NOEXCEPT;

exception_ptr(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;

#if __cplusplus >= 201103L
      exception_ptr(nullptr_t) noexcept
      : _M_exception_object(0)
      { }

exception_ptr(exception_ptr&& __o) noexcept
      : _M_exception_object(__o._M_exception_object)
      { __o._M_exception_object = 0; }
#endif

#if (__cplusplus < 201103L) || defined (_GLIBCXX_EH_PTR_COMPAT)
      typedef void (exception_ptr::*__safe_bool)();

// For construction from nullptr or 0.
      exception_ptr(__safe_bool) _GLIBCXX_USE_NOEXCEPT;
#endif

exception_ptr& 
      operator=(const exception_ptr&) _GLIBCXX_USE_NOEXCEPT;

#if __cplusplus >= 201103L
      exception_ptr& 
      operator=(exception_ptr&& __o) noexcept
      {
        exception_ptr(static_cast<exception_ptr&&>(__o)).swap(*this);
        return *this;
      }
#endif

~exception_ptr() _GLIBCXX_USE_NOEXCEPT;

void 
      swap(exception_ptr&) _GLIBCXX_USE_NOEXCEPT;

#ifdef _GLIBCXX_EH_PTR_COMPAT
      // Retained for compatibility with CXXABI_1.3.
      void _M_safe_bool_dummy() _GLIBCXX_USE_NOEXCEPT
	__attribute__ ((__const__));
      bool operator!() const _GLIBCXX_USE_NOEXCEPT
	__attribute__ ((__pure__));
      operator __safe_bool() const _GLIBCXX_USE_NOEXCEPT;
#endif

#if __cplusplus >= 201103L
      explicit operator bool() const
      { return _M_exception_object; }
#endif

friend bool 
      operator==(const exception_ptr&, const exception_ptr&)
	_GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));

const class std::type_info*
      __cxa_exception_type() const _GLIBCXX_USE_NOEXCEPT
	__attribute__ ((__pure__));
    };

bool 
    operator==(const exception_ptr&, const exception_ptr&)
      _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));

bool 
    operator!=(const exception_ptr&, const exception_ptr&)
      _GLIBCXX_USE_NOEXCEPT __attribute__ ((__pure__));

inline void
    swap(exception_ptr& __lhs, exception_ptr& __rhs)
    { __lhs.swap(__rhs); }

template<typename _Ex>
      inline void
      __dest_thunk(void* __x)
      { static_cast<_Ex*>(__x)->~_Ex(); }

} // namespace __exception_ptr

/// Obtain an exception_ptr pointing to a copy of the supplied object.
  template<typename _Ex>
    exception_ptr 
    make_exception_ptr(_Ex __ex) _GLIBCXX_USE_NOEXCEPT
    {
#if __cpp_exceptions && __cpp_rtti && !_GLIBCXX_HAVE_CDTOR_CALLABI
      void* __e = __cxxabiv1::__cxa_allocate_exception(sizeof(_Ex));
      (void) __cxxabiv1::__cxa_init_primary_exception(
	  __e, const_cast<std::type_info*>(&typeid(__ex)),
	  __exception_ptr::__dest_thunk<_Ex>);
      try
	{
          ::new (__e) _Ex(__ex);
          return exception_ptr(__e);
	}
      catch(...)
	{
	  __cxxabiv1::__cxa_free_exception(__e);
	  return current_exception();
	}
#elif __cpp_exceptions
      try
	{
          throw __ex;
	}
      catch(...)
	{
	  return current_exception();
	}
#else // no RTTI and no exceptions
      return exception_ptr();
#endif
    }

// @} group exceptions
} // namespace std

} // extern "C++"

#pragma GCC visibility pop

#endif

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