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// -*- C++ -*- Implement the members of exception_ptr.

// Copyright (C) 2008, 2009 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>

#ifdef _GLIBCXX_ATOMIC_BUILTINS_4

#define _GLIBCXX_EH_PTR_COMPAT

#include <exception>

#include <exception_ptr.h>

#include "unwind-cxx.h"

using namespace __cxxabiv1;

std::__exception_ptr::exception_ptr::exception_ptr() throw()

: _M_exception_object(0) { }

std::__exception_ptr::exception_ptr::exception_ptr(void* obj) throw()

: _M_exception_object(obj)  { _M_addref(); }

std::__exception_ptr::exception_ptr::exception_ptr(__safe_bool) throw()

: _M_exception_object(0) { }

std::__exception_ptr::

exception_ptr::exception_ptr(const exception_ptr& other) throw()

: _M_exception_object(other._M_exception_object)

{ _M_addref(); }

std::__exception_ptr::exception_ptr::~exception_ptr() throw()

{ _M_release(); }

std::__exception_ptr::exception_ptr&

std::__exception_ptr::

exception_ptr::operator=(const exception_ptr& other) throw()

{

  exception_ptr(other).swap(*this);

  return *this;

}

void

std::__exception_ptr::exception_ptr::_M_addref() throw()

{

  if (_M_exception_object)

    {

      __cxa_refcounted_exception *eh =

        __get_refcounted_exception_header_from_obj (_M_exception_object);

      __sync_add_and_fetch (&eh->referenceCount, 1);

    }

}

void

std::__exception_ptr::exception_ptr::_M_release() throw()

{

  if (_M_exception_object)

    {

      __cxa_refcounted_exception *eh =

        __get_refcounted_exception_header_from_obj (_M_exception_object);

      if (__sync_sub_and_fetch (&eh->referenceCount, 1) == 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 throw()

{ return _M_exception_object; }

void

std::__exception_ptr::exception_ptr::_M_safe_bool_dummy() throw () { }

void

std::__exception_ptr::exception_ptr::swap(exception_ptr &other) throw()

{

  void *tmp = _M_exception_object;

  _M_exception_object = other._M_exception_object;

  other._M_exception_object = tmp;

}

// Retained for compatibility with CXXABI_1.3.

bool

std::__exception_ptr::exception_ptr::operator!() const throw()

{ return _M_exception_object == 0; }

// Retained for compatibility with CXXABI_1.3.

std::__exception_ptr::exception_ptr::operator __safe_bool() const throw()

{

  return _M_exception_object ? &exception_ptr::_M_safe_bool_dummy : 0;

}

const std::type_info*

std::__exception_ptr::exception_ptr::__cxa_exception_type() const throw()

{

  __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) throw()

{ return lhs._M_exception_object == rhs._M_exception_object; }

bool std::__exception_ptr::operator!=(const exception_ptr& lhs,

                                      const exception_ptr& rhs) throw()

{ return !(lhs == rhs);}

std::exception_ptr

std::current_exception() throw()

{

  __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 (__sync_sub_and_fetch (&header->referenceCount, 1) == 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;

  __sync_add_and_fetch (&eh->referenceCount, 1);

  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