/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.max.graal.compiler.ir;

import java.util.*;

import com.oracle.max.graal.compiler.debug.*;
import com.oracle.max.graal.graph.*;
import com.sun.cri.ci.*;


public final class EndNode extends FixedNode {

    public EndNode(Graph graph) {
        super(CiKind.Illegal, graph);
    }

    @Override
    public void accept(ValueVisitor v) {
        v.visitEndNode(this);
    }

    @Override
    public void print(LogStream out) {
        out.print("end");
    }

    public Merge merge() {
        if (usages().size() == 0) {
            return null;
        } else {
            assert usages().size() == 1;
            return (Merge) usages().iterator().next();
        }
    }

    @Override
    public boolean verify() {
        assertTrue(usages().size() <= 1, "at most one usage");
        return true;
    }

    @Override
    public Iterable< ? extends Node> dataUsages() {
        return Collections.emptyList();
    }

    @Override
    public Iterable< ? extends Node> cfgSuccessors() {
        Merge merge = this.merge();
        if (merge == null) {
            return Collections.emptyList();
        }
        return Arrays.asList(merge);
    }
}