text: // -*- C++ -*- Implement the members of exception_ptr.
  // Copyright (C) 2008, 2009, 2010, 2011, 2012 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/>.
  
  #include <bits/c++config.h>
  #include <bits/atomic_lockfree_defines.h>
  
  #if ATOMIC_INT_LOCK_FREE > 1
  
  #define _GLIBCXX_EH_PTR_COMPAT
  
  #include <exception>
  #include <bits/exception_ptr.h>
  #include "unwind-cxx.h"
  
  using namespace __cxxabiv1;
  
  std::__exception_ptr::exception_ptr::exception_ptr() _GLIBCXX_USE_NOEXCEPT
  : _M_exception_object(0) { }
  
  
  std::__exception_ptr::exception_ptr::exception_ptr(void* obj)
  _GLIBCXX_USE_NOEXCEPT
  : _M_exception_object(obj)  { _M_addref(); }
  
  
  std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool)
  _GLIBCXX_USE_NOEXCEPT
  : _M_exception_object(0) { }
  
  
  std::__exception_ptr::
  exception_ptr::exception_ptr(const exception_ptr& other) _GLIBCXX_USE_NOEXCEPT
  : _M_exception_object(other._M_exception_object)
  { _M_addref(); }
  
  
  std::__exception_ptr::exception_ptr::~exception_ptr() _GLIBCXX_USE_NOEXCEPT
  { _M_release(); }
  
  
  std::__exception_ptr::exception_ptr&
  std::__exception_ptr::
  exception_ptr::operator=(const exception_ptr& other) _GLIBCXX_USE_NOEXCEPT
  {
    exception_ptr(other).swap(*this);
    return *this;
  }
  
  
  void
  std::__exception_ptr::exception_ptr::_M_addref() _GLIBCXX_USE_NOEXCEPT
  {
    if (_M_exception_object)
      {
        __cxa_refcounted_exception *eh =
  	__get_refcounted_exception_header_from_obj (_M_exception_object);
        __atomic_add_fetch (&eh->referenceCount, 1, __ATOMIC_ACQ_REL);
      }
  }
  
  
  void
  std::__exception_ptr::exception_ptr::_M_release() _GLIBCXX_USE_NOEXCEPT
  {
    if (_M_exception_object)
      {
        __cxa_refcounted_exception *eh =
  	__get_refcounted_exception_header_from_obj (_M_exception_object);
        if (__atomic_sub_fetch (&eh->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
          {
  	  if (eh->exc.exceptionDestructor)
  	    eh->exc.exceptionDestructor (_M_exception_object);
  
            __cxa_free_exception (_M_exception_object);
            _M_exception_object = 0;
          }
      }
  }
  
  
  void*
  std::__exception_ptr::exception_ptr::_M_get() const _GLIBCXX_USE_NOEXCEPT
  { return _M_exception_object; }
  
  
  void
  std::__exception_ptr::exception_ptr::swap(exception_ptr &other)
    _GLIBCXX_USE_NOEXCEPT
  {
    void *tmp = _M_exception_object;
    _M_exception_object = other._M_exception_object;
    other._M_exception_object = tmp;
  }
  
  
  // Retained for compatibility with CXXABI_1.3.
  void
  std::__exception_ptr::exception_ptr::_M_safe_bool_dummy()
    _GLIBCXX_USE_NOEXCEPT { }
  
  
  // Retained for compatibility with CXXABI_1.3.
  bool
  std::__exception_ptr::exception_ptr::operator!() const _GLIBCXX_USE_NOEXCEPT
  { return _M_exception_object == 0; }
  
  
  // Retained for compatibility with CXXABI_1.3.
  std::__exception_ptr::exception_ptr::operator __safe_bool() const
  _GLIBCXX_USE_NOEXCEPT
  {
    return _M_exception_object ? &exception_ptr::_M_safe_bool_dummy : 0;
  }
  
  
  const std::type_info*
  std::__exception_ptr::exception_ptr::__cxa_exception_type() const
    _GLIBCXX_USE_NOEXCEPT
  {
    __cxa_exception *eh = __get_exception_header_from_obj (_M_exception_object);
    return eh->exceptionType;
  }
  
  
  bool std::__exception_ptr::operator==(const exception_ptr& lhs,
  				      const exception_ptr& rhs)
    _GLIBCXX_USE_NOEXCEPT
  { return lhs._M_exception_object == rhs._M_exception_object; }
  
  
  bool std::__exception_ptr::operator!=(const exception_ptr& lhs,
  				      const exception_ptr& rhs)
    _GLIBCXX_USE_NOEXCEPT
  { return !(lhs == rhs);}
  
  
  std::exception_ptr
  std::current_exception() _GLIBCXX_USE_NOEXCEPT
  {
    __cxa_eh_globals *globals = __cxa_get_globals ();
    __cxa_exception *header = globals->caughtExceptions;
  
    if (!header)
      return std::exception_ptr();
  
    // Since foreign exceptions can't be counted, we can't return them.
    if (!__is_gxx_exception_class (header->unwindHeader.exception_class))
      return std::exception_ptr();
  
    return std::exception_ptr(
      __get_object_from_ambiguous_exception (header));
  }
  
  
  static void
  __gxx_dependent_exception_cleanup(_Unwind_Reason_Code code,
  				  _Unwind_Exception *exc)
  {
    // This cleanup is set only for dependents.
    __cxa_dependent_exception *dep = __get_dependent_exception_from_ue (exc);
    __cxa_refcounted_exception *header =
      __get_refcounted_exception_header_from_obj (dep->primaryException);
  
    // We only want to be called through _Unwind_DeleteException.
    // _Unwind_DeleteException in the HP-UX IA64 libunwind library
    // returns _URC_NO_REASON and not _URC_FOREIGN_EXCEPTION_CAUGHT
    // like the GCC _Unwind_DeleteException function does.
    if (code != _URC_FOREIGN_EXCEPTION_CAUGHT && code != _URC_NO_REASON)
      __terminate (header->exc.terminateHandler);
  
    __cxa_free_dependent_exception (dep);
  
    if (__atomic_sub_fetch (&header->referenceCount, 1, __ATOMIC_ACQ_REL) == 0)
      {
        if (header->exc.exceptionDestructor)
  	header->exc.exceptionDestructor (header + 1);
  
        __cxa_free_exception (header + 1);
      }
  }
  
  
  void
  std::rethrow_exception(std::exception_ptr ep)
  {
    void *obj = ep._M_get();
    __cxa_refcounted_exception *eh
      = __get_refcounted_exception_header_from_obj (obj);
  
    __cxa_dependent_exception *dep = __cxa_allocate_dependent_exception ();
    dep->primaryException = obj;
    __atomic_add_fetch (&eh->referenceCount, 1,  __ATOMIC_ACQ_REL);
  
    dep->unexpectedHandler = __unexpected_handler;
    dep->terminateHandler = __terminate_handler;
    __GXX_INIT_DEPENDENT_EXCEPTION_CLASS(dep->unwindHeader.exception_class);
    dep->unwindHeader.exception_cleanup = __gxx_dependent_exception_cleanup;
  
  #ifdef _GLIBCXX_SJLJ_EXCEPTIONS
    _Unwind_SjLj_RaiseException (&dep->unwindHeader);
  #else
    _Unwind_RaiseException (&dep->unwindHeader);
  #endif
  
    // Some sort of unwinding error.  Note that terminate is a handler.
    __cxa_begin_catch (&dep->unwindHeader);
    std::terminate();
  }
  
  #undef _GLIBCXX_EH_PTR_COMPAT
  
  #endif
  