1 /* 2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2019, Red Hat Inc. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 26 package org.graalvm.compiler.hotspot.gc.shared; 27 28 import org.graalvm.compiler.debug.GraalError; 29 import org.graalvm.compiler.hotspot.GraalHotSpotVMConfig; 30 import org.graalvm.compiler.nodes.StructuredGraph; 31 import org.graalvm.compiler.nodes.ValueNode; 32 import org.graalvm.compiler.nodes.extended.ArrayRangeWrite; 33 import org.graalvm.compiler.nodes.java.AbstractCompareAndSwapNode; 34 import org.graalvm.compiler.nodes.java.LoweredAtomicReadAndWriteNode; 35 import org.graalvm.compiler.nodes.memory.FixedAccessNode; 36 import org.graalvm.compiler.nodes.memory.HeapAccess; 37 import org.graalvm.compiler.nodes.memory.ReadNode; 38 import org.graalvm.compiler.nodes.memory.WriteNode; 39 import org.graalvm.compiler.nodes.memory.address.AddressNode; 40 import org.graalvm.compiler.nodes.type.StampTool; 41 42 public class CardTableBarrierSet extends BarrierSet { 43 44 public CardTableBarrierSet(GraalHotSpotVMConfig vmConfig) { 45 super(vmConfig); 46 } 47 48 @Override 49 public void addReadNodeBarriers(ReadNode node, StructuredGraph graph) { 50 // Nothing to do here. 51 } 52 53 @Override 54 public void addWriteNodeBarriers(WriteNode node, StructuredGraph graph) { 55 HeapAccess.BarrierType barrierType = node.getBarrierType(); 56 switch (barrierType) { 57 case NONE: 58 // nothing to do 59 break; 60 case FIELD: 61 case ARRAY: 62 case UNKNOWN: 63 boolean precise = barrierType != HeapAccess.BarrierType.FIELD; 64 boolean init = node.getLocationIdentity().isInit(); 65 if (!init || !getVMConfig().useDeferredInitBarriers) { 66 addSerialPostWriteBarrier(node, node.getAddress(), node.value(), precise, graph); 67 } 68 break; 69 default: 70 throw new GraalError("unexpected barrier type: " + barrierType); 71 } 72 } 73 74 @Override 75 public void addAtomicReadWriteNodeBarriers(LoweredAtomicReadAndWriteNode node, StructuredGraph graph) { 76 HeapAccess.BarrierType barrierType = node.getBarrierType(); 77 switch (barrierType) { 78 case NONE: 79 // nothing to do 80 break; 81 case FIELD: 82 case ARRAY: 83 case UNKNOWN: 84 boolean precise = barrierType != HeapAccess.BarrierType.FIELD; 85 addSerialPostWriteBarrier(node, node.getAddress(), node.getNewValue(), precise, graph); 86 break; 87 default: 88 throw new GraalError("unexpected barrier type: " + barrierType); 89 } 90 } 91 92 @Override 93 public void addCASBarriers(AbstractCompareAndSwapNode node, StructuredGraph graph) { 94 HeapAccess.BarrierType barrierType = node.getBarrierType(); 95 switch (barrierType) { 96 case NONE: 97 // nothing to do 98 break; 99 case FIELD: 100 case ARRAY: 101 case UNKNOWN: 102 boolean precise = barrierType != HeapAccess.BarrierType.FIELD; 103 addSerialPostWriteBarrier(node, node.getAddress(), node.getNewValue(), precise, graph); 104 break; 105 default: 106 throw new GraalError("unexpected barrier type: " + barrierType); 107 } 108 } 109 110 @Override 111 public void addArrayRangeBarriers(ArrayRangeWrite write, StructuredGraph graph) { 112 SerialArrayRangeWriteBarrier serialArrayRangeWriteBarrier = graph.add(new SerialArrayRangeWriteBarrier(write.getAddress(), write.getLength(), write.getElementStride())); 113 graph.addAfterFixed(write.asNode(), serialArrayRangeWriteBarrier); 114 } 115 116 protected void addSerialPostWriteBarrier(FixedAccessNode node, AddressNode address, ValueNode value, boolean precise, StructuredGraph graph) { 117 final boolean alwaysNull = StampTool.isPointerAlwaysNull(value); 118 if (alwaysNull) { 119 // Serial barrier isn't needed for null value 120 return; 121 } 122 graph.addAfterFixed(node, graph.add(new SerialWriteBarrier(address, precise))); 123 } 124 }