/*

 * 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/shenandoahPassiveMode.hpp"

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

#include "logging/log.hpp"

#include "logging/logTag.hpp"

void ShenandoahPassiveMode::initialize_flags() const {

  // Do not allow concurrent cycles.

  FLAG_SET_DEFAULT(ExplicitGCInvokesConcurrent, false);

  FLAG_SET_DEFAULT(ShenandoahImplicitGCInvokesConcurrent, false);

  // Passive runs with max speed for allocation, because GC is always STW

  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahPacing);

  // No need for evacuation reserve with Full GC, only for Degenerated GC.

  if (!ShenandoahDegeneratedGC) {

    SHENANDOAH_ERGO_OVERRIDE_DEFAULT(ShenandoahEvacReserve, 0);

  }

  // Disable known barriers by default.

  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahLoadRefBarrier);

  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahSATBBarrier);

  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahKeepAliveBarrier);

  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahStoreValEnqueueBarrier);

  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCASBarrier);

  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahCloneBarrier);

  // Final configuration checks

  // No barriers are required to run.

}

ShenandoahHeuristics* ShenandoahPassiveMode::initialize_heuristics() const {

  if (ShenandoahGCHeuristics != NULL) {

    return new ShenandoahPassiveHeuristics();

  }

  ShouldNotReachHere();

  return NULL;

}