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 28 void ShenandoahTraversalMode::initialize_flags() const { 29 FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false); 30 FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, true); 31 FLAG_SET_DEFAULT(ShenandoahKeepAliveBarrier, false); 32 FLAG_SET_DEFAULT(ShenandoahAllowMixedAllocs, false); 33 34 SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent); 35 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent); 36 37 // Final configuration checks 38 SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier); 39 SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValEnqueueBarrier); 40 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier); 41 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier); 42 } 43 44 ShenandoahHeuristics* ShenandoahTraversalMode::initialize_heuristics() const { 45 if (ShenandoahGCHeuristics != NULL) { 46 if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) { 47 return new ShenandoahTraversalHeuristics(); 48 } else { 49 vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option"); 50 } 51 } 52 ShouldNotReachHere(); 53 return NULL; 54 }