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.InputType; 30 import org.graalvm.compiler.nodeinfo.NodeInfo; 31 import org.graalvm.compiler.nodes.DeoptimizingNode; 32 import org.graalvm.compiler.nodes.FrameState; 33 import org.graalvm.compiler.nodes.ValueNode; 34 import org.graalvm.compiler.nodes.memory.address.AddressNode; 35 36 @NodeInfo(cycles = CYCLES_50, size = SIZE_50) 37 public final class G1PreWriteBarrier extends ObjectWriteBarrier implements DeoptimizingNode.DeoptBefore { 38 39 public static final NodeClass<G1PreWriteBarrier> TYPE = NodeClass.create(G1PreWriteBarrier.class); 40 41 @OptionalInput(InputType.State) FrameState stateBefore; 42 protected final boolean nullCheck; 43 protected final boolean doLoad; 44 45 public G1PreWriteBarrier(AddressNode address, ValueNode expectedObject, boolean doLoad, boolean nullCheck) { 46 super(TYPE, address, expectedObject, true); 47 this.doLoad = doLoad; 48 this.nullCheck = nullCheck; 49 } 50 51 public ValueNode getExpectedObject() { 52 return getValue(); 53 } 54 55 public boolean doLoad() { 56 return doLoad; 57 } 58 59 public boolean getNullCheck() { 60 return nullCheck; 61 } 62 63 @Override 64 public boolean canDeoptimize() { 65 return nullCheck; 66 } 67 68 @Override 69 public FrameState stateBefore() { 70 return stateBefore; 71 } 72 73 @Override 74 public void setStateBefore(FrameState state) { 75 updateUsages(stateBefore, state); 76 stateBefore = state; 77 } 78 }