1 /*

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

     3  *

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

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

     6  * published by the Free Software Foundation.

     7  *

     8  * This code is distributed in the hope that it will be useful, but WITHOUT

     9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

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

    12  * accompanied this code).

    13  *

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

    15  * 2 along with this work; if not, write to the Free Software Foundation,

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

    17  *

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

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

    20  * questions.

    21  *

    22  */

    23 

    24 #include "precompiled.hpp"

    25 #include "gc/shenandoah/shenandoahTraversalMode.hpp"

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

    27 #include "logging/log.hpp"

    28 #include "logging/logTag.hpp"

    29 

    30 void ShenandoahTraversalMode::initialize_flags() const {

    31   FLAG_SET_DEFAULT(ShenandoahSATBBarrier,            false);

    32   FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, true);

    33   FLAG_SET_DEFAULT(ShenandoahKeepAliveBarrier,       false);

    34   FLAG_SET_DEFAULT(ShenandoahAllowMixedAllocs,       false);

    35 

    36   SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent);

    37   SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent);

    38 

    39   // Final configuration checks

    40   SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier);

    41   SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValEnqueueBarrier);

    42   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier);

    43   SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier);

    44 }

    45 

    46 ShenandoahHeuristics* ShenandoahTraversalMode::initialize_heuristics() const {

    47   if (ShenandoahGCHeuristics != NULL) {

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

    49       return new ShenandoahTraversalHeuristics();

    50     } else {

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

    52     }

    53   }

    54   ShouldNotReachHere();

    55   return NULL;

    56 }