001/*
002 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023package com.oracle.graal.nodes.memory;
024
025import com.oracle.graal.compiler.common.type.*;
026import com.oracle.graal.graph.*;
027import com.oracle.graal.graph.spi.*;
028import com.oracle.graal.nodeinfo.*;
029import com.oracle.graal.nodeinfo.StructuralInput.Memory;
030import com.oracle.graal.nodes.*;
031import com.oracle.graal.nodes.spi.*;
032
033@NodeInfo(allowedUsageTypes = {InputType.Memory})
034public final class MemoryAnchorNode extends FixedWithNextNode implements LIRLowerable, MemoryNode, Canonicalizable {
035
036    public static final NodeClass<MemoryAnchorNode> TYPE = NodeClass.create(MemoryAnchorNode.class);
037
038    public MemoryAnchorNode() {
039        super(TYPE, StampFactory.forVoid());
040    }
041
042    public void generate(NodeLIRBuilderTool generator) {
043        // Nothing to emit, since this node is used for structural purposes only.
044    }
045
046    @Override
047    public Node canonical(CanonicalizerTool tool) {
048        return tool.allUsagesAvailable() && hasNoUsages() ? null : this;
049    }
050
051    @NodeIntrinsic
052    public static native Memory anchor();
053}