/*
 * Copyright (c) 2014, 2015, 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 "gc/shared/gcId.hpp"

uint GCId::_next_id = 0;
uint GCId::_current_id = UNDEFINED;

const uint GCId::create() {
  return _next_id++;
}

const uint GCId::current() {
  assert(_current_id != UNDEFINED, "Using undefined GC ID");
  return _current_id;
}

GCIdMark::GCIdMark() {
  _previous_gc_id = GCId::_current_id;
  uint gc_id = GCId::create();
  GCId::set_current(gc_id);
  DEBUG_ONLY(_gc_id = gc_id;)
}

GCIdMark::~GCIdMark() {
  assert(_gc_id == GCId::_current_id, err_msg("GCIdMarks for %u and %u overlap.", _gc_id, GCId::_current_id));
  GCId::set_current(_previous_gc_id);
}