1 /* 2 * Copyright (c) 2011, 2016, 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.nodes.memory; 24 25 import org.graalvm.compiler.core.common.LIRKind; 26 import org.graalvm.compiler.core.common.type.Stamp; 27 import org.graalvm.compiler.graph.Node; 28 import org.graalvm.compiler.graph.NodeClass; 29 import org.graalvm.compiler.graph.spi.Canonicalizable; 30 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 31 import org.graalvm.compiler.nodeinfo.NodeInfo; 32 import org.graalvm.compiler.nodes.ValueNode; 33 import org.graalvm.compiler.nodes.memory.address.AddressNode; 34 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 35 import org.graalvm.word.LocationIdentity; 36 37 /** 38 * Writes a given {@linkplain #value() value} a {@linkplain FixedAccessNode memory location}. 39 */ 40 @NodeInfo(nameTemplate = "Write#{p#location/s}") 41 public class WriteNode extends AbstractWriteNode implements LIRLowerableAccess, Canonicalizable { 42 43 public static final NodeClass<WriteNode> TYPE = NodeClass.create(WriteNode.class); 44 45 public WriteNode(AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) { 46 super(TYPE, address, location, value, barrierType); 47 } 48 49 protected WriteNode(NodeClass<? extends WriteNode> c, AddressNode address, LocationIdentity location, ValueNode value, BarrierType barrierType) { 50 super(c, address, location, value, barrierType); 51 } 52 53 @Override 54 public void generate(NodeLIRBuilderTool gen) { 55 LIRKind writeKind = gen.getLIRGeneratorTool().getLIRKind(value().stamp()); 56 gen.getLIRGeneratorTool().getArithmetic().emitStore(writeKind, gen.operand(address), gen.operand(value()), gen.state(this)); 57 } 58 59 @Override 60 public boolean canNullCheck() { 61 return true; 62 } 63 64 @Override 65 public Stamp getAccessStamp() { 66 return value().stamp(); 67 } 68 69 @Override 70 public Node canonical(CanonicalizerTool tool) { 71 if (tool.canonicalizeReads() && hasExactlyOneUsage() && next() instanceof WriteNode) { 72 WriteNode write = (WriteNode) next(); 73 if (write.lastLocationAccess == this && write.getAddress() == getAddress() && getAccessStamp().isCompatible(write.getAccessStamp())) { 74 write.setLastLocationAccess(getLastLocationAccess()); 75 return write; 76 } 77 } 78 return this; 79 } 80 }