1 /* 2 * Copyright (c) 2014, 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.nodes.memory; 24 25 import static org.graalvm.compiler.nodeinfo.InputType.Memory; 26 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; 27 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; 28 29 import org.graalvm.compiler.core.common.type.StampFactory; 30 import org.graalvm.compiler.graph.Node; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.graph.spi.Canonicalizable; 33 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 34 import org.graalvm.compiler.nodeinfo.NodeInfo; 35 import org.graalvm.compiler.nodeinfo.StructuralInput.Memory; 36 import org.graalvm.compiler.nodes.FixedWithNextNode; 37 import org.graalvm.compiler.nodes.spi.LIRLowerable; 38 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool; 39 40 @NodeInfo(allowedUsageTypes = Memory, cycles = CYCLES_0, size = SIZE_0) 41 public final class MemoryAnchorNode extends FixedWithNextNode implements LIRLowerable, MemoryNode, Canonicalizable { 42 43 public static final NodeClass<MemoryAnchorNode> TYPE = NodeClass.create(MemoryAnchorNode.class); 44 45 public MemoryAnchorNode() { 46 super(TYPE, StampFactory.forVoid()); 47 } 48 49 @Override 50 public void generate(NodeLIRBuilderTool generator) { 51 // Nothing to emit, since this node is used for structural purposes only. 52 } 53 54 @Override 55 public Node canonical(CanonicalizerTool tool) { 56 return tool.allUsagesAvailable() && hasNoUsages() ? null : this; 57 } 58 59 @NodeIntrinsic 60 public static native Memory anchor(); 61 }