001/*
002 * Copyright (c) 2011, 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;
024
025import java.util.*;
026
027import com.oracle.graal.compiler.common.type.*;
028import com.oracle.graal.graph.*;
029import com.oracle.graal.nodeinfo.*;
030import com.oracle.graal.nodes.spi.*;
031
032@NodeInfo
033public abstract class AbstractEndNode extends FixedNode implements IterableNodeType, LIRLowerable {
034
035    public static final NodeClass<AbstractEndNode> TYPE = NodeClass.create(AbstractEndNode.class);
036
037    protected AbstractEndNode(NodeClass<? extends AbstractEndNode> c) {
038        super(c, StampFactory.forVoid());
039    }
040
041    @Override
042    public void generate(NodeLIRBuilderTool gen) {
043        gen.visitEndNode(this);
044    }
045
046    public AbstractMergeNode merge() {
047        return (AbstractMergeNode) usages().first();
048    }
049
050    @Override
051    public boolean verify() {
052        assertTrue(getUsageCount() <= 1, "at most one usage");
053        return super.verify();
054    }
055
056    @Override
057    public Iterable<? extends Node> cfgSuccessors() {
058        return Arrays.asList(merge());
059    }
060}