1 /* 2 * Copyright (c) 2019, Red Hat, Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "gc/shenandoah/shenandoahTraversalMode.hpp" 27 #include "gc/shenandoah/heuristics/shenandoahTraversalAggressiveHeuristics.hpp" 28 #include "gc/shenandoah/heuristics/shenandoahTraversalHeuristics.hpp" 29 #include "logging/log.hpp" 30 #include "logging/logTag.hpp" 31 32 void ShenandoahTraversalMode::initialize_flags() const { 33 FLAG_SET_DEFAULT(ShenandoahSATBBarrier, false); 34 FLAG_SET_DEFAULT(ShenandoahStoreValEnqueueBarrier, true); 35 FLAG_SET_DEFAULT(ShenandoahAllowMixedAllocs, false); 36 37 SHENANDOAH_ERGO_ENABLE_FLAG(ExplicitGCInvokesConcurrent); 38 SHENANDOAH_ERGO_ENABLE_FLAG(ShenandoahImplicitGCInvokesConcurrent); 39 40 // Final configuration checks 41 SHENANDOAH_CHECK_FLAG_SET(ShenandoahLoadRefBarrier); 42 SHENANDOAH_CHECK_FLAG_SET(ShenandoahStoreValEnqueueBarrier); 43 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCASBarrier); 44 SHENANDOAH_CHECK_FLAG_SET(ShenandoahCloneBarrier); 45 } 46 47 ShenandoahHeuristics* ShenandoahTraversalMode::initialize_heuristics() const { 48 if (ShenandoahGCHeuristics != NULL) { 49 if (strcmp(ShenandoahGCHeuristics, "adaptive") == 0) { 50 return new ShenandoahTraversalHeuristics(); 51 } else if (strcmp(ShenandoahGCHeuristics, "aggressive") == 0) { 52 return new ShenandoahTraversalAggressiveHeuristics(); 53 } else { 54 vm_exit_during_initialization("Unknown -XX:ShenandoahGCHeuristics option"); 55 } 56 } 57 ShouldNotReachHere(); 58 return NULL; 59 }