/*

 * Copyright (c) 2019, Red Hat, Inc. All rights reserved.

 *

 * 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/shenandoah/shenandoahTraversalMode.hpp"

#include "gc/shenandoah/heuristics/shenandoahTraversalAggressiveHeuristics.hpp"

#include "gc/shenandoah/heuristics/shenandoahTraversalHeuristics.hpp"

#include "logging/log.hpp"

#include "logging/logTag.hpp"

void ShenandoahTraversalMode::initialize_flags() const {

  FLAG_SET_DEFAULT(ShenandoahSATBBarrier,            false);

  FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, true);

  FLAG_SET_DEFAULT(ShenandoahKeepAliveBarrier,       false);

  FLAG_SET_DEFAULT(ShenandoahAllowMixedAllocs,       false);

  SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);

  SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);

  // Final configuration checks

  SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);

  SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValEnqueueBarrier);

  SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);

  SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);

}

ShenandoahHeuristics* ShenandoahTraversalMode::initialize_heuristics() const {

  if (ShenandoahGCHeuristics != NULL) {

    if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) {

      return new ShenandoahTraversalHeuristics();

    } else if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) {

      return new ShenandoahTraversalAggressiveHeuristics();

    } else {

      vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option");

    }

  }

  ShouldNotReachHere();

  return NULL;

}