/*

 * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "runtime/handles.inline.hpp"

#include "utilities/preserveException.hpp"

// TODO: These three classes should be refactored

PreserveExceptionMark::PreserveExceptionMark(Thread*& thread) {

  thread     = Thread::current();

  _thread    = thread;

  _preserved_exception_oop = Handle(thread, _thread->pending_exception());

  _preserved_exception_line = _thread->exception_line();

  _preserved_exception_file = _thread->exception_file();

  _thread->clear_pending_exception(); // Needed to avoid infinite recursion

}

PreserveExceptionMark::~PreserveExceptionMark() {

  if (_thread->has_pending_exception()) {

    oop exception = _thread->pending_exception();

    _thread->clear_pending_exception(); // Needed to avoid infinite recursion

    exception->print();

    fatal("PreserveExceptionMark destructor expects no pending exceptions");

  }

  if (_preserved_exception_oop() != NULL) {

    _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);

  }

}

// This code is cloned from PreserveExceptionMark, except that:

//   returned pending exceptions do not cause a crash.

//   thread is passed in, not set (not a reference parameter)

//   and bug 6431341 has been addressed.

CautiouslyPreserveExceptionMark::CautiouslyPreserveExceptionMark(Thread* thread) {

  _thread    = thread;

  _preserved_exception_oop = Handle(thread, _thread->pending_exception());

  _preserved_exception_line = _thread->exception_line();

  _preserved_exception_file = _thread->exception_file();

  _thread->clear_pending_exception(); // Pending exceptions are checked in the destructor

}

CautiouslyPreserveExceptionMark::~CautiouslyPreserveExceptionMark() {

  assert(!_thread->has_pending_exception(), "unexpected exception generated");

  if (_thread->has_pending_exception()) {

    _thread->clear_pending_exception();

  }

  if (_preserved_exception_oop() != NULL) {

    _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);

  }

}

void WeakPreserveExceptionMark::preserve() {

  _preserved_exception_oop = Handle(_thread, _thread->pending_exception());

  _preserved_exception_line = _thread->exception_line();

  _preserved_exception_file = _thread->exception_file();

  _thread->clear_pending_exception();

}

void WeakPreserveExceptionMark::restore() {

  if (!_thread->has_pending_exception()) {

    _thread->set_pending_exception(_preserved_exception_oop(), _preserved_exception_file, _preserved_exception_line);

  }

}