1 /* 2 * Copyright (c) 2013, 2015, Oracle and/or its affiliates. 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 package org.graalvm.compiler.hotspot.nodes; 24 25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_50; 26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_50; 27 28 import org.graalvm.compiler.graph.NodeClass; 29 import org.graalvm.compiler.nodeinfo.NodeInfo; 30 import org.graalvm.compiler.nodes.ValueNode; 31 import org.graalvm.compiler.nodes.memory.address.AddressNode; 32 33 /** 34 * The {@code G1ReferentFieldReadBarrier} is added when a read access is performed to the referent 35 * field of a {@link java.lang.ref.Reference} object (through a {@code LoadFieldNode} or an 36 * {@code UnsafeLoadNode}). The return value of the read is passed to the snippet implementing the 37 * read barrier and consequently is added to the SATB queue if the concurrent marker is enabled. 38 */ 39 @NodeInfo(cycles = CYCLES_50, size = SIZE_50) 40 public final class G1ReferentFieldReadBarrier extends ObjectWriteBarrier { 41 public static final NodeClass<G1ReferentFieldReadBarrier> TYPE = NodeClass.create(G1ReferentFieldReadBarrier.class); 42 43 protected final boolean doLoad; 44 45 public G1ReferentFieldReadBarrier(AddressNode address, ValueNode expectedObject, boolean doLoad) { 46 super(TYPE, address, expectedObject, true); 47 this.doLoad = doLoad; 48 } 49 50 public ValueNode getExpectedObject() { 51 return getValue(); 52 } 53 54 public boolean doLoad() { 55 return doLoad; 56 } 57 }