001/*
002 * Copyright (c) 2015, 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.debug;
024
025import com.oracle.graal.compiler.common.type.*;
026import com.oracle.graal.graph.*;
027import com.oracle.graal.nodeinfo.*;
028import com.oracle.graal.nodes.*;
029import com.oracle.graal.nodes.spi.*;
030
031/**
032 * This node prevents control flow optimizations. It is never duplicated or merged with other
033 * control flow anchors.
034 */
035@NodeInfo
036public final class ControlFlowAnchorNode extends FixedWithNextNode implements LIRLowerable {
037
038    public static final NodeClass<ControlFlowAnchorNode> TYPE = NodeClass.create(ControlFlowAnchorNode.class);
039
040    private static class Unique {
041    }
042
043    protected Unique unique;
044
045    public ControlFlowAnchorNode() {
046        super(TYPE, StampFactory.forVoid());
047        this.unique = new Unique();
048    }
049
050    /**
051     * Used by MacroSubstitution.
052     */
053    public ControlFlowAnchorNode(@SuppressWarnings("unused") Invoke invoke) {
054        this();
055    }
056
057    public void generate(NodeLIRBuilderTool generator) {
058        // do nothing
059    }
060
061    @Override
062    protected void afterClone(Node other) {
063        assert false : this + " should never be cloned";
064    }
065}