/*
 * Copyright (c) 2012, 2012, 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.graal.compiler.schedule;

import java.util.*;

import com.oracle.graal.compiler.graph.*;
import com.oracle.graal.compiler.types.*;
import com.oracle.graal.nodes.*;

class UnscheduleState implements MergeableState<UnscheduleState> {

    public FixedWithNextNode last;

    @Override
    public boolean merge(MergeNode merge, Collection<UnscheduleState> withStates) {
        last = null;
        return true;
    }

    @Override
    public void loopBegin(LoopBeginNode loop) {
        last = null;
    }

    @Override
    public void loopEnds(LoopBeginNode loop, Collection<UnscheduleState> loopEndStates) {
        last = null;
    }

    @Override
    public void afterSplit(FixedNode node) {
        last = null;
    }

    @Override
    public UnscheduleState clone() {
        return new UnscheduleState();
    }
}

public class UnscheduleNodes extends ScheduledNodeIterator<UnscheduleState> {

    public UnscheduleNodes(FixedNode start) {
        super(start, new UnscheduleState());
    }

    @Override
    protected void node(ScheduledNode node) {
        if (node instanceof FixedNode) {
            if (state.last != null) {
                state.last.setNext((FixedNode) node);
            }
            if (node instanceof FixedWithNextNode) {
                state.last = (FixedWithNextNode) node;
            }
        } else {
            node.setScheduledNext(null);
        }
    }
}